Initial source

9 files changed, 12617 insertions, 0 deletions

diff --git a/i386/i386at/gpl/linux/block/cmd640.c b/i386/i386at/gpl/linux/block/cmd640.c
new file mode 100644
index 0000000..99a139d
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/cmd640.c
@@ -0,0 +1,738 @@
+/*
+ *  linux/drivers/block/cmd640.c	Version 0.07  Jan 27, 1996
+ *
+ *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
+ */
+
+/*
+ *  Principal Author/Maintainer:  abramov@cecmow.enet.dec.com (Igor Abramov)
+ *
+ *  This file provides support for the advanced features and bugs
+ *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
+ *
+ *  Version 0.01	Initial version, hacked out of ide.c,
+ *			and #include'd rather than compiled separately.
+ *			This will get cleaned up in a subsequent release.
+ *
+ *  Version 0.02	Fixes for vlb initialization code, enable
+ *			read-ahead for versions 'B' and 'C' of chip by
+ *			default, some code cleanup.
+ *
+ *  Version 0.03	Added reset of secondary interface,
+ *			and black list for devices which are not compatible
+ *			with read ahead mode. Separate function for setting
+ *			readahead is added, possibly it will be called some
+ *			day from ioctl processing code.
+ *  
+ *  Version 0.04	Now configs/compiles separate from ide.c  -ml 
+ *
+ *  Version 0.05	Major rewrite of interface timing code.
+ *			Added new function cmd640_set_mode to set PIO mode
+ *			from ioctl call. New drives added to black list.
+ *
+ *  Version 0.06	More code cleanup. Readahead is enabled only for
+ *			detected hard drives, not included in readahed
+ *			black list.
+ * 
+ *  Version 0.07	Changed to more conservative drive tuning policy.
+ *			Unknown drives, which report PIO < 4 are set to 
+ *			(reported_PIO - 1) if it is supported, or to PIO0.
+ *			List of known drives extended by info provided by
+ *			CMD at their ftp site.
+ *
+ *  Version 0.08	Added autotune/noautotune support.  -ml
+ *			
+ */
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <asm/io.h>
+#include "ide.h"
+#include "ide_modes.h"
+
+int cmd640_vlb = 0;
+
+/*
+ * CMD640 specific registers definition.
+ */
+
+#define VID		0x00
+#define DID		0x02
+#define PCMD		0x04
+#define PSTTS		0x06
+#define REVID		0x08
+#define PROGIF		0x09
+#define SUBCL		0x0a
+#define BASCL		0x0b
+#define BaseA0		0x10
+#define BaseA1		0x14
+#define BaseA2		0x18
+#define BaseA3		0x1c
+#define INTLINE		0x3c
+#define INPINE		0x3d
+
+#define	CFR		0x50
+#define   CFR_DEVREV		0x03
+#define   CFR_IDE01INTR		0x04
+#define	  CFR_DEVID		0x18
+#define	  CFR_AT_VESA_078h	0x20
+#define	  CFR_DSA1		0x40
+#define	  CFR_DSA0		0x80
+
+#define CNTRL		0x51
+#define	  CNTRL_DIS_RA0		0x40
+#define   CNTRL_DIS_RA1		0x80
+#define	  CNTRL_ENA_2ND		0x08
+
+#define	CMDTIM		0x52
+#define	ARTTIM0		0x53
+#define	DRWTIM0		0x54
+#define ARTTIM1 	0x55
+#define DRWTIM1		0x56
+#define ARTTIM23	0x57
+#define   DIS_RA2		0x04
+#define   DIS_RA3		0x08
+#define DRWTIM23	0x58
+#define BRST		0x59
+
+static ide_tuneproc_t cmd640_tune_drive;
+
+/* Interface to access cmd640x registers */
+static void (*put_cmd640_reg)(int reg_no, int val);
+static byte (*get_cmd640_reg)(int reg_no);
+
+enum { none, vlb, pci1, pci2 };
+static int	bus_type = none;
+static int	cmd640_chip_version;
+static int	cmd640_key;
+static int 	bus_speed; /* MHz */
+
+/*
+ * For some unknown reasons pcibios functions which read and write registers
+ * do not always work with cmd640. We use direct IO instead.
+ */
+
+/* PCI method 1 access */
+
+static void put_cmd640_reg_pci1(int reg_no, int val)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outl_p((reg_no & 0xfc) | cmd640_key, 0xcf8);
+	outb_p(val, (reg_no & 3) + 0xcfc);
+	restore_flags(flags);
+}
+
+static byte get_cmd640_reg_pci1(int reg_no)
+{
+	byte b;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outl_p((reg_no & 0xfc) | cmd640_key, 0xcf8);
+	b = inb_p(0xcfc + (reg_no & 3));
+	restore_flags(flags);
+	return b;
+}
+
+/* PCI method 2 access (from CMD datasheet) */
+ 
+static void put_cmd640_reg_pci2(int reg_no, int val)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(0x10, 0xcf8);
+	outb_p(val, cmd640_key + reg_no);
+	outb_p(0, 0xcf8);
+	restore_flags(flags);
+}
+
+static byte get_cmd640_reg_pci2(int reg_no)
+{
+	byte b;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(0x10, 0xcf8);
+	b = inb_p(cmd640_key + reg_no);
+	outb_p(0, 0xcf8);
+	restore_flags(flags);
+	return b;
+}
+
+/* VLB access */
+
+static void put_cmd640_reg_vlb(int reg_no, int val)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(reg_no, cmd640_key + 8);
+	outb_p(val, cmd640_key + 0xc);
+	restore_flags(flags);
+}
+
+static byte get_cmd640_reg_vlb(int reg_no)
+{
+	byte b;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	outb_p(reg_no, cmd640_key + 8);
+	b = inb_p(cmd640_key + 0xc);
+	restore_flags(flags);
+	return b;
+}
+
+/*
+ * Probe for CMD640x -- pci method 1
+ */
+
+static int probe_for_cmd640_pci1(void)
+{
+	long id;
+	int	k;
+
+	for (k = 0x80000000; k <= 0x8000f800; k += 0x800) {
+		outl(k, 0xcf8);
+		id = inl(0xcfc);
+		if (id != 0x06401095)
+			continue;
+		put_cmd640_reg = put_cmd640_reg_pci1;
+		get_cmd640_reg = get_cmd640_reg_pci1;
+		cmd640_key = k;
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Probe for CMD640x -- pci method 2
+ */
+
+static int probe_for_cmd640_pci2(void)
+{
+	int i;
+	int v_id;
+	int d_id;
+
+	for (i = 0xc000; i <= 0xcf00; i += 0x100) {
+		outb(0x10, 0xcf8);
+		v_id = inw(i);
+		d_id = inw(i + 2);
+		outb(0, 0xcf8);
+		if (v_id != 0x1095 || d_id != 0x640)
+			continue;
+		put_cmd640_reg = put_cmd640_reg_pci2;
+		get_cmd640_reg = get_cmd640_reg_pci2;
+		cmd640_key = i;
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Probe for CMD640x -- vlb
+ */
+
+static int probe_for_cmd640_vlb(void) {
+	byte b;
+
+	outb(CFR, 0x178);
+	b = inb(0x17c);
+	if (b == 0xff || b == 0 || (b & CFR_AT_VESA_078h)) {
+		outb(CFR, 0x78);
+		b = inb(0x7c);
+		if (b == 0xff || b == 0 || !(b & CFR_AT_VESA_078h))
+			return 0;
+		cmd640_key = 0x70;
+	} else {
+		cmd640_key = 0x170;
+	}
+	put_cmd640_reg = put_cmd640_reg_vlb;
+	get_cmd640_reg = get_cmd640_reg_vlb;
+	return 1;
+}
+
+/*
+ * Low level reset for controller, actually it has nothing specific for
+ * CMD640, but I don't know how to use standard reset routine before
+ * we recognized any drives.
+ */
+
+static void cmd640_reset_controller(int iface_no)
+{
+	int retry_count = 600;
+	int base_port = iface_no ? 0x170 : 0x1f0;
+
+	outb_p(4, base_port + 7);
+	udelay(5);
+	outb_p(0, base_port + 7);
+
+	do {
+		udelay(5);
+		retry_count -= 1;
+	} while ((inb_p(base_port + 7) & 0x80) && retry_count);
+
+	if (retry_count == 0)
+		printk("cmd640: failed to reset controller %d\n", iface_no);
+#if 0	
+	else
+		printk("cmd640: controller %d reset [%d]\n", 
+			iface_no, retry_count);
+#endif
+}
+
+/*
+ * Probe for Cmd640x and initialize it if found
+ */
+
+int ide_probe_for_cmd640x(void)
+{
+	int  second_port;
+        byte b;
+
+	if (probe_for_cmd640_pci1()) {
+		bus_type = pci1;
+	} else if (probe_for_cmd640_pci2()) {
+		bus_type = pci2;
+	} else if (cmd640_vlb && probe_for_cmd640_vlb()) {
+		/* May be remove cmd640_vlb at all, and probe in any case */
+		bus_type = vlb;
+	} else {
+		return 0;
+	}
+
+	ide_hwifs[0].serialized = 1;	/* ensure this *always* gets set */
+	
+#if 0	
+	/* Dump initial state of chip registers */
+	for (b = 0; b != 0xff; b++) {
+		printk(" %2x%c", get_cmd640_reg(b),
+				((b&0xf) == 0xf) ? '\n' : ',');
+	}
+
+#endif
+
+	/*
+	 * Undocumented magic. (There is no 0x5b port in specs)
+	 */
+
+	put_cmd640_reg(0x5b, 0xbd);
+	if (get_cmd640_reg(0x5b) != 0xbd) {
+		printk("ide: can't initialize cmd640 -- wrong value in 0x5b\n");
+		return 0;
+	}
+	put_cmd640_reg(0x5b, 0);
+
+	/*
+	 * Documented magic.
+	 */
+
+	cmd640_chip_version = get_cmd640_reg(CFR) & CFR_DEVREV;
+	if (cmd640_chip_version == 0) {
+		printk ("ide: wrong CMD640 version -- 0\n");
+		return 0;
+	}
+
+	/*
+	 * Setup the most conservative timings for all drives,
+	 */
+	put_cmd640_reg(ARTTIM0, 0xc0);
+	put_cmd640_reg(ARTTIM1, 0xc0);
+	put_cmd640_reg(ARTTIM23, 0xcc); /* 0xc0? */
+
+	/*
+	 * Do not initialize secondary controller for vlbus
+	 */
+	second_port = (bus_type != vlb);
+
+	/*
+	 * Set the maximum allowed bus speed (it is safest until we
+	 * 				      find how to detect bus speed)
+	 * Normally PCI bus runs at 33MHz, but often works overclocked to 40
+	 */
+	bus_speed = (bus_type == vlb) ? 50 : 40; 
+
+        /*
+	 * Setup Control Register
+	 */
+	b = get_cmd640_reg(CNTRL);	
+
+	if (second_port)
+		b |= CNTRL_ENA_2ND;
+	else
+		b &= ~CNTRL_ENA_2ND;
+
+	/*
+	 * Disable readahead for drives at primary interface
+	 */
+	b |= (CNTRL_DIS_RA0 | CNTRL_DIS_RA1);
+
+        put_cmd640_reg(CNTRL, b);
+
+	/*
+	 * Note that we assume that the first interface is at 0x1f0,
+	 * and that the second interface, if enabled, is at 0x170.
+	 */
+	ide_hwifs[0].chipset = ide_cmd640;
+	ide_hwifs[0].tuneproc = &cmd640_tune_drive;
+	if (ide_hwifs[0].drives[0].autotune == 0)
+		ide_hwifs[0].drives[0].autotune = 1;
+	if (ide_hwifs[0].drives[1].autotune == 0)
+		ide_hwifs[0].drives[1].autotune = 1;
+
+	/*
+	 * Initialize 2nd IDE port, if required
+	 */
+	if (second_port) {
+		ide_hwifs[1].chipset = ide_cmd640;
+		ide_hwifs[1].tuneproc = &cmd640_tune_drive;
+		if (ide_hwifs[1].drives[0].autotune == 0)
+			ide_hwifs[1].drives[0].autotune = 1;
+		if (ide_hwifs[1].drives[1].autotune == 0)
+			ide_hwifs[1].drives[1].autotune = 1;
+		/* We reset timings, and disable read-ahead */
+		put_cmd640_reg(ARTTIM23, (DIS_RA2 | DIS_RA3));
+		put_cmd640_reg(DRWTIM23, 0);
+
+		cmd640_reset_controller(1);
+	}
+
+	printk("ide: buggy CMD640%c interface at ", 
+	       'A' - 1 + cmd640_chip_version);
+	switch (bus_type) {
+		case vlb :
+			printk("local bus, port 0x%x", cmd640_key);
+			break;
+		case pci1:
+			printk("pci, (0x%x)", cmd640_key);
+			break;
+		case pci2:
+			printk("pci,(access method 2) (0x%x)", cmd640_key);
+			break;
+	}
+
+	/*
+	 * Reset interface timings
+	 */
+	put_cmd640_reg(CMDTIM, 0);
+
+	printk("\n ... serialized, secondary interface %s\n",
+	       second_port ? "enabled" : "disabled");
+
+	return 1;
+}
+
+int cmd640_off(void) {
+	static int a = 0;
+	byte b;
+
+	if (bus_type == none || a == 1)
+		return 0;
+	a = 1;
+	b = get_cmd640_reg(CNTRL);	
+	b &= ~CNTRL_ENA_2ND;
+	put_cmd640_reg(CNTRL, b);
+	return 1;
+}
+
+/*
+ * Sets readahead mode for specific drive
+ *  in the future it could be called from ioctl
+ */
+
+static void set_readahead_mode(int mode, int if_num, int dr_num)
+{
+	static int masks[2][2] = 
+		{ 
+			{CNTRL_DIS_RA0, CNTRL_DIS_RA1}, 
+			{DIS_RA2, 	DIS_RA3}
+		};
+
+	int port = (if_num == 0) ? CNTRL : ARTTIM23;
+	int mask = masks[if_num][dr_num];
+	byte b;
+
+	b = get_cmd640_reg(port);
+	if (mode)
+		b &= ~mask;	/* Enable readahead for specific drive */
+	else
+		b |= mask;	/* Disable readahed for specific drive */
+	put_cmd640_reg(port, b);
+}		
+
+static struct readahead_black_list {
+	const char* 	name;
+	int		mode;	
+} drives_ra[] = {
+        { "ST3655A",	0 },
+        { "SAMSUNG",	0 },	/* Be conservative */
+ 	{ NULL, 0 }
+};	
+
+static int strmatch(const char* pattern, const char* name) {
+	char c1, c2;
+
+	while (1) {
+		c1 = *pattern++;
+		c2 = *name++;
+		if (c1 == 0) {
+			return 0;
+		}
+		if (c1 != c2)
+			return 1;
+	}
+}
+
+static int known_drive_readahead(char* name) {
+	int i;
+
+	for (i = 0; drives_ra[i].name != NULL; i++) {
+		if (strmatch(drives_ra[i].name, name) == 0) {
+			return drives_ra[i].mode;
+		}
+	}
+        return -1;
+}
+
+static int arttim[4]  = {2, 2, 2, 2};	/* Address setup count (in clocks) */
+static int a_count[4] = {1, 1, 1, 1};	/* Active count   (encoded) */
+static int r_count[4] = {1, 1, 1, 1};	/* Recovery count (encoded) */
+
+/*
+ * Convert address setup count from number of clocks 
+ * to representation used by controller
+ */
+
+inline static int pack_arttim(int clocks)
+{
+	if (clocks <= 2) return 0x40;
+	else if (clocks == 3) return 0x80;
+	else if (clocks == 4) return 0x00;
+	else return 0xc0;
+}
+
+/*
+ * Pack active and recovery counts into single byte representation
+ * used by controller
+ */
+
+inline static int pack_counts(int act_count, int rec_count)
+{
+	return ((act_count & 0x0f)<<4) | (rec_count & 0x0f);
+}
+
+inline int max(int a, int b) { return a > b ? a : b; }
+inline int max4(int *p) { return max(p[0], max(p[1], max(p[2], p[3]))); }
+
+/*
+ * Set timing parameters
+ */
+
+static void cmd640_set_timing(int if_num, int dr_num)
+{
+	int	b_reg;
+	int	ac, rc, at;
+
+	/*
+	 * Set address setup count and drive read/write timing registers.
+	 * Primary interface has individual count/timing registers for
+	 * each drive. Secondary interface has common set of registers, and
+	 * we should set timings for the slowest drive.
+	 */
+
+	if (if_num == 0) {
+		b_reg = dr_num ? ARTTIM1 : ARTTIM0;
+		at = arttim[dr_num];
+		ac = a_count[dr_num];
+		rc = r_count[dr_num];
+	} else {
+		b_reg = ARTTIM23;
+		at = max(arttim[2], arttim[3]);
+		ac = max(a_count[2], a_count[3]);
+		rc = max(r_count[2], r_count[3]);
+	}
+
+	put_cmd640_reg(b_reg, pack_arttim(at));
+	put_cmd640_reg(b_reg + 1, pack_counts(ac, rc));
+
+	/*
+	 * Update CMDTIM (IDE Command Block Timing Register) 
+	 */
+
+	ac = max4(r_count);
+	rc = max4(a_count);
+	put_cmd640_reg(CMDTIM, pack_counts(ac, rc));
+}
+
+/*
+ * Standard timings for PIO modes
+ */
+
+static struct pio_timing {
+	int	mc_time;	/* Minimal cycle time (ns) */
+	int	av_time;	/* Address valid to DIOR-/DIOW- setup (ns) */
+	int	ds_time;	/* DIOR data setup	(ns) */
+} pio_timings[6] = {
+	{ 70,	165,	600 },	/* PIO Mode 0 */
+	{ 50,	125,	383 },	/* PIO Mode 1 */
+	{ 30,	100,	240 },	/* PIO Mode 2 */
+	{ 30,	80,	180 },	/* PIO Mode 3 */
+	{ 25,	70,	125 },	/* PIO Mode 4  -- should be 120, not 125 */
+	{ 20,	50,	100 }	/* PIO Mode ? (nonstandard) */
+};
+
+static void cmd640_timings_to_clocks(int mc_time, int av_time, int ds_time,
+				int clock_time, int drv_idx)
+{
+	int a, b;
+
+	arttim[drv_idx] = (mc_time + clock_time - 1)/clock_time;
+
+	a = (av_time + clock_time - 1)/clock_time;
+	if (a < 2)
+		a = 2;
+	b = (ds_time + clock_time - 1)/clock_time - a;
+	if (b < 2)
+		b = 2;
+	if (b > 0x11) {
+		a += b - 0x11;
+		b = 0x11;
+	}
+	if (a > 0x10)
+		a = 0x10;
+	if (cmd640_chip_version > 1)
+		b -= 1;
+	if (b > 0x10)
+		b = 0x10;
+
+	a_count[drv_idx] = a;
+	r_count[drv_idx] = b;
+}
+
+static void set_pio_mode(int if_num, int drv_num, int mode_num) {
+	int p_base;
+	int i;
+
+	p_base = if_num ? 0x170 : 0x1f0;
+	outb_p(3, p_base + 1);
+	outb_p(mode_num | 8, p_base + 2);
+	outb_p((drv_num | 0xa) << 4, p_base + 6);
+	outb_p(0xef, p_base + 7);
+	for (i = 0; (i < 100) && (inb (p_base + 7) & 0x80); i++)
+		udelay(10000);
+}
+
+/*
+ * Set a specific pio_mode for a drive
+ */
+
+static void cmd640_set_mode(ide_drive_t* drive, int pio_mode) {
+	int interface_number;
+	int drive_number;
+	int clock_time; /* ns */
+	int mc_time, av_time, ds_time;
+
+	interface_number = HWIF(drive)->index;
+	drive_number = drive->select.b.unit;
+	clock_time = 1000/bus_speed;
+
+	mc_time = pio_timings[pio_mode].mc_time;
+	av_time = pio_timings[pio_mode].av_time;
+	ds_time = pio_timings[pio_mode].ds_time;
+
+	cmd640_timings_to_clocks(mc_time, av_time, ds_time, clock_time,
+				interface_number*2 + drive_number);
+	set_pio_mode(interface_number, drive_number, pio_mode);
+	cmd640_set_timing(interface_number, drive_number);
+}
+
+/*
+ * Drive PIO mode "autoconfiguration".
+ * Ideally, this code should *always* call cmd640_set_mode(), but it doesn't.
+ */
+
+static void cmd640_tune_drive(ide_drive_t *drive, byte pio_mode) {
+	int interface_number;
+	int drive_number;
+	int clock_time; /* ns */
+	int max_pio;
+	int mc_time, av_time, ds_time;
+	struct hd_driveid* id;
+	int readahead;	/* there is a global named read_ahead */
+
+	if (pio_mode != 255) {
+		cmd640_set_mode(drive, pio_mode);
+		return;
+	}
+
+	interface_number = HWIF(drive)->index;
+	drive_number = drive->select.b.unit;
+	clock_time = 1000/bus_speed;
+	id = drive->id;
+	if ((max_pio = ide_scan_pio_blacklist(id->model)) != -1) {
+		ds_time = pio_timings[max_pio].ds_time;
+	} else {
+		max_pio = id->tPIO;
+		ds_time = pio_timings[max_pio].ds_time;
+		if (id->field_valid & 2) {
+			if ((id->capability & 8) && (id->eide_pio_modes & 7)) {
+				if (id->eide_pio_modes & 4) max_pio = 5;
+				else if (id->eide_pio_modes & 2) max_pio = 4;
+				else max_pio = 3;
+				ds_time = id->eide_pio_iordy;
+			} else {
+				ds_time = id->eide_pio;
+			}
+			if (ds_time == 0)
+				ds_time = pio_timings[max_pio].ds_time;
+		}
+
+		/*
+		 * Conservative "downgrade"
+		 */
+		if (max_pio < 4 && max_pio != 0) {
+			max_pio -= 1;
+			ds_time = pio_timings[max_pio].ds_time;		
+		}
+	}
+	mc_time = pio_timings[max_pio].mc_time;
+	av_time = pio_timings[max_pio].av_time;
+	cmd640_timings_to_clocks(mc_time, av_time, ds_time, clock_time,
+				interface_number*2 + drive_number);
+	set_pio_mode(interface_number, drive_number, max_pio);
+	cmd640_set_timing(interface_number, drive_number);
+
+	/*
+	 * Disable (or set) readahead mode
+	 */
+
+	readahead = 0;
+	if (cmd640_chip_version > 1) {	/* Mmmm.. probably should be > 2 ?? */
+		readahead = known_drive_readahead(id->model);
+		if (readahead == -1)
+	        	readahead = 1;	/* Mmmm.. probably be 0 ?? */
+		set_readahead_mode(readahead, interface_number, drive_number);
+	}   
+
+	printk ("Mode and Timing set to PIO%d, Readahead is %s\n", 
+		max_pio, readahead ? "enabled" : "disabled");
+}
+
diff --git a/i386/i386at/gpl/linux/block/floppy.c b/i386/i386at/gpl/linux/block/floppy.c
new file mode 100644
index 0000000..ee4a898
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/floppy.c
@@ -0,0 +1,4100 @@
+/*
+ *  linux/kernel/floppy.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 1993, 1994  Alain Knaff
+ */
+/*
+ * 02.12.91 - Changed to static variables to indicate need for reset
+ * and recalibrate. This makes some things easier (output_byte reset
+ * checking etc), and means less interrupt jumping in case of errors,
+ * so the code is hopefully easier to understand.
+ */
+
+/*
+ * This file is certainly a mess. I've tried my best to get it working,
+ * but I don't like programming floppies, and I have only one anyway.
+ * Urgel. I should check for more errors, and do more graceful error
+ * recovery. Seems there are problems with several drives. I've tried to
+ * correct them. No promises.
+ */
+
+/*
+ * As with hd.c, all routines within this file can (and will) be called
+ * by interrupts, so extreme caution is needed. A hardware interrupt
+ * handler may not sleep, or a kernel panic will happen. Thus I cannot
+ * call "floppy-on" directly, but have to set a special timer interrupt
+ * etc.
+ */
+
+/*
+ * 28.02.92 - made track-buffering routines, based on the routines written
+ * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
+ */
+
+/*
+ * Automatic floppy-detection and formatting written by Werner Almesberger
+ * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
+ * the floppy-change signal detection.
+ */
+
+/*
+ * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
+ * FDC data overrun bug, added some preliminary stuff for vertical
+ * recording support.
+ *
+ * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
+ *
+ * TODO: Errors are still not counted properly.
+ */
+
+/* 1992/9/20
+ * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
+ * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
+ * Christoph H. Hochst\"atter.
+ * I have fixed the shift values to the ones I always use. Maybe a new
+ * ioctl() should be created to be able to modify them.
+ * There is a bug in the driver that makes it impossible to format a
+ * floppy as the first thing after bootup.
+ */
+
+/*
+ * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
+ * this helped the floppy driver as well. Much cleaner, and still seems to
+ * work.
+ */
+
+/* 1994/6/24 --bbroad-- added the floppy table entries and made
+ * minor modifications to allow 2.88 floppies to be run.
+ */
+
+/* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
+ * disk types.
+ */
+
+/*
+ * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
+ * format bug fixes, but unfortunately some new bugs too...
+ */
+
+/* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
+ * errors to allow safe writing by specialized programs.
+ */
+
+/* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
+ * by defining bit 1 of the "stretch" parameter to mean put sectors on the
+ * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
+ * drives are "upside-down").
+ */
+
+/*
+ * 1995/8/26 -- Andreas Busse -- added Mips support.
+ */
+
+/*
+ * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependend
+ * features to asm/floppy.h.
+ */
+
+
+#define FLOPPY_SANITY_CHECK
+#undef  FLOPPY_SILENT_DCL_CLEAR
+
+#define REALLY_SLOW_IO
+
+#define DEBUGT 2
+#define DCL_DEBUG /* debug disk change line */
+
+/* do print messages for unexpected interrupts */
+static int print_unex=1;
+#include <linux/utsname.h>
+#include <linux/module.h>
+
+/* the following is the mask of allowed drives. By default units 2 and
+ * 3 of both floppy controllers are disabled, because switching on the
+ * motor of these drives causes system hangs on some PCI computers. drive
+ * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
+ * a drive is allowed. */
+static int FLOPPY_IRQ=6;
+static int FLOPPY_DMA=2;
+static int allowed_drive_mask = 0x33;
+ 
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/tqueue.h>
+#define FDPATCHES
+#include <linux/fdreg.h>
+
+
+#include <linux/fd.h>
+
+
+#define OLDFDRAWCMD 0x020d /* send a raw command to the fdc */
+
+struct old_floppy_raw_cmd {
+  void *data;
+  long length;
+
+  unsigned char rate;
+  unsigned char flags;
+  unsigned char cmd_count;
+  unsigned char cmd[9];
+  unsigned char reply_count;
+  unsigned char reply[7];
+  int track;
+};
+
+#include <linux/errno.h>
+#include <linux/malloc.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/mc146818rtc.h> /* CMOS defines */
+#include <linux/ioport.h>
+
+#include <asm/dma.h>
+#include <asm/floppy.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/segment.h>
+
+#define MAJOR_NR FLOPPY_MAJOR
+
+#include <linux/blk.h>
+
+
+/* Dma Memory related stuff */
+
+/* Pure 2^n version of get_order */
+static inline int __get_order (int size)
+{
+	int order;
+
+#ifdef  _ASM_IO_H2
+	__asm__ __volatile__("bsr %1,%0"
+			     : "=r" (order)
+			     : "r" (size / PAGE_SIZE));
+#else
+	for (order = 0; order < NR_MEM_LISTS; ++order)
+		if (size <= (PAGE_SIZE << order))
+			return order;
+#endif
+	return NR_MEM_LISTS;
+}
+
+static unsigned long dma_mem_alloc(int size)
+{
+	int order = __get_order(size);
+
+	if (order >= NR_MEM_LISTS)
+		return(0);
+	return __get_dma_pages(GFP_KERNEL,order);
+}
+
+/* End dma memory related stuff */
+
+static unsigned int fake_change = 0;
+static int initialising=1;
+
+static inline int TYPE(kdev_t x) {
+	return  (MINOR(x)>>2) & 0x1f;
+}
+static inline int DRIVE(kdev_t x) {
+	return (MINOR(x)&0x03) | ((MINOR(x)&0x80) >> 5);
+}
+#define ITYPE(x) (((x)>>2) & 0x1f)
+#define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
+#define UNIT(x) ((x) & 0x03)		/* drive on fdc */
+#define FDC(x) (((x) & 0x04) >> 2)  /* fdc of drive */
+#define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
+				/* reverse mapping from unit and fdc to drive */
+#define DP (&drive_params[current_drive])
+#define DRS (&drive_state[current_drive])
+#define DRWE (&write_errors[current_drive])
+#define FDCS (&fdc_state[fdc])
+#define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
+#define SETF(x) (set_bit(x##_BIT, &DRS->flags))
+#define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
+
+#define UDP (&drive_params[drive])
+#define UDRS (&drive_state[drive])
+#define UDRWE (&write_errors[drive])
+#define UFDCS (&fdc_state[FDC(drive)])
+#define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
+#define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
+#define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
+
+#define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
+
+#define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
+
+#define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
+
+#define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
+
+#define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
+#define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
+
+#define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
+
+/* read/write */
+#define COMMAND raw_cmd->cmd[0]
+#define DR_SELECT raw_cmd->cmd[1]
+#define TRACK raw_cmd->cmd[2]
+#define HEAD raw_cmd->cmd[3]
+#define SECTOR raw_cmd->cmd[4]
+#define SIZECODE raw_cmd->cmd[5]
+#define SECT_PER_TRACK raw_cmd->cmd[6]
+#define GAP raw_cmd->cmd[7]
+#define SIZECODE2 raw_cmd->cmd[8]
+#define NR_RW 9
+
+/* format */
+#define F_SIZECODE raw_cmd->cmd[2]
+#define F_SECT_PER_TRACK raw_cmd->cmd[3]
+#define F_GAP raw_cmd->cmd[4]
+#define F_FILL raw_cmd->cmd[5]
+#define NR_F 6
+
+/*
+ * Maximum disk size (in kilobytes). This default is used whenever the
+ * current disk size is unknown.
+ * [Now it is rather a minimum]
+ */
+#define MAX_DISK_SIZE 2 /* 3984*/
+
+#define K_64	0x10000		/* 64KB */
+
+/*
+ * globals used by 'result()'
+ */
+#define MAX_REPLIES 17
+static unsigned char reply_buffer[MAX_REPLIES];
+static int inr; /* size of reply buffer, when called from interrupt */
+#define ST0 (reply_buffer[0])
+#define ST1 (reply_buffer[1])
+#define ST2 (reply_buffer[2])
+#define ST3 (reply_buffer[0]) /* result of GETSTATUS */
+#define R_TRACK (reply_buffer[3])
+#define R_HEAD (reply_buffer[4])
+#define R_SECTOR (reply_buffer[5])
+#define R_SIZECODE (reply_buffer[6])
+
+#define SEL_DLY (2*HZ/100)
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+/*
+ * this struct defines the different floppy drive types.
+ */
+static struct {
+	struct floppy_drive_params params;
+	const char *name; /* name printed while booting */
+} default_drive_params[]= {
+/* NOTE: the time values in jiffies should be in msec!
+ CMOS drive type
+  |     Maximum data rate supported by drive type
+  |     |   Head load time, msec
+  |     |   |   Head unload time, msec (not used)
+  |     |   |   |     Step rate interval, usec
+  |     |   |   |     |       Time needed for spinup time (jiffies)
+  |     |   |   |     |       |      Timeout for spinning down (jiffies)
+  |     |   |   |     |       |      |   Spindown offset (where disk stops)
+  |     |   |   |     |       |      |   |     Select delay
+  |     |   |   |     |       |      |   |     |     RPS
+  |     |   |   |     |       |      |   |     |     |    Max number of tracks
+  |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
+  |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
+  |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
+{{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
+      0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
+
+{{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
+      0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
+
+{{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
+      0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
+
+{{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
+      0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
+
+{{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
+      0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
+
+{{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
+      0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
+
+{{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
+      0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
+/*    |  --autodetected formats---    |      |      |
+ *    read_track                      |      |    Name printed when booting
+ *				      |     Native format
+ *	            Frequency of disk change checks */
+};
+
+static struct floppy_drive_params drive_params[N_DRIVE];
+static struct floppy_drive_struct drive_state[N_DRIVE];
+static struct floppy_write_errors write_errors[N_DRIVE];
+static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
+
+/*
+ * This struct defines the different floppy types.
+ *
+ * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
+ * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
+ * tells if the disk is in Commodore 1581 format, which means side 0 sectors
+ * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
+ * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
+ * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
+ * side 0 is on physical side 0 (but with the misnamed sector IDs).
+ * 'stretch' should probably be renamed to something more general, like
+ * 'options'.  Other parameters should be self-explanatory (see also
+ * setfdprm(8)).
+ */
+static struct floppy_struct floppy_type[32] = {
+	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    },	/*  0 no testing    */
+	{  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
+	{ 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" },	/*  2 1.2MB AT      */
+	{  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  },	/*  3 360KB SS 3.5" */
+	{ 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  },	/*  4 720KB 3.5"    */
+	{  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  },	/*  5 360KB AT      */
+	{ 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  },	/*  6 720KB AT      */
+	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" },	/*  7 1.44MB 3.5"   */
+	{ 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" },	/*  8 2.88MB 3.5"   */
+	{ 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"},	/*  9 2.88MB 3.5"   */
+
+	{ 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
+	{ 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
+	{  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  },	/* 12 410KB 5.25"   */
+	{ 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  },	/* 13 820KB 3.5"    */
+	{ 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" },	/* 14 1.48MB 5.25"  */
+	{ 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" },	/* 15 1.72MB 3.5"   */
+	{  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  },	/* 16 420KB 5.25"   */
+	{ 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  },	/* 17 830KB 3.5"    */
+	{ 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" },	/* 18 1.49MB 5.25"  */
+	{ 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
+
+	{ 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
+	{ 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
+	{ 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
+	{ 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
+	{ 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
+	{ 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
+	{ 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
+	{ 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
+	{ 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
+
+	{ 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
+	{ 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  },	/* 30 800KB 3.5"    */
+	{ 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
+};
+
+#define	NUMBER(x)	(sizeof(x) / sizeof(*(x)))
+#define SECTSIZE (_FD_SECTSIZE(*floppy))
+
+/* Auto-detection: Disk type used until the next media change occurs. */
+static struct floppy_struct *current_type[N_DRIVE] = {
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL
+};
+
+/*
+ * User-provided type information. current_type points to
+ * the respective entry of this array.
+ */
+static struct floppy_struct user_params[N_DRIVE];
+
+static int floppy_sizes[256];
+static int floppy_blocksizes[256] = { 0, };
+
+/*
+ * The driver is trying to determine the correct media format
+ * while probing is set. rw_interrupt() clears it after a
+ * successful access.
+ */
+static int probing = 0;
+
+/* Synchronization of FDC access. */
+#define FD_COMMAND_NONE -1
+#define FD_COMMAND_ERROR 2
+#define FD_COMMAND_OKAY 3
+
+static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
+static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
+#ifdef MACH
+extern int issig (void);
+#define NO_SIGNAL (! issig () || ! interruptible)
+#else
+#define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
+#endif
+#define CALL(x) if ((x) == -EINTR) return -EINTR
+#define ECALL(x) if ((ret = (x))) return ret;
+#define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
+#define WAIT(x) _WAIT((x),interruptible)
+#define IWAIT(x) _WAIT((x),1)
+
+/* Errors during formatting are counted here. */
+static int format_errors;
+
+/* Format request descriptor. */
+static struct format_descr format_req;
+
+/*
+ * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
+ * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
+ * H is head unload time (1=16ms, 2=32ms, etc)
+ */
+
+/*
+ * Track buffer
+ * Because these are written to by the DMA controller, they must
+ * not contain a 64k byte boundary crossing, or data will be
+ * corrupted/lost. Alignment of these is enforced in boot/head.S.
+ * Note that you must not change the sizes below without updating head.S.
+ */
+static char *floppy_track_buffer=0;
+static int max_buffer_sectors=0;
+
+static int *errors;
+typedef void (*done_f)(int);
+static struct cont_t {
+	void (*interrupt)(void); /* this is called after the interrupt of the
+				  * main command */
+	void (*redo)(void); /* this is called to retry the operation */
+	void (*error)(void); /* this is called to tally an error */
+	done_f done; /* this is called to say if the operation has 
+		      * succeeded/failed */
+} *cont=NULL;
+
+static void floppy_ready(void);
+static void floppy_start(void);
+static void process_fd_request(void);
+static void recalibrate_floppy(void);
+static void floppy_shutdown(void);
+
+static int floppy_grab_irq_and_dma(void);
+static void floppy_release_irq_and_dma(void);
+
+/*
+ * The "reset" variable should be tested whenever an interrupt is scheduled,
+ * after the commands have been sent. This is to ensure that the driver doesn't
+ * get wedged when the interrupt doesn't come because of a failed command.
+ * reset doesn't need to be tested before sending commands, because
+ * output_byte is automatically disabled when reset is set.
+ */
+#define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
+static void reset_fdc(void);
+
+/*
+ * These are global variables, as that's the easiest way to give
+ * information to interrupts. They are the data used for the current
+ * request.
+ */
+#define NO_TRACK -1
+#define NEED_1_RECAL -2
+#define NEED_2_RECAL -3
+
+/* */
+static int usage_count = 0;
+
+
+/* buffer related variables */
+static int buffer_track = -1;
+static int buffer_drive = -1;
+static int buffer_min = -1;
+static int buffer_max = -1;
+
+/* fdc related variables, should end up in a struct */
+static struct floppy_fdc_state fdc_state[N_FDC];
+static int fdc; /* current fdc */
+
+static struct floppy_struct * floppy = floppy_type;
+static unsigned char current_drive = 0;
+static long current_count_sectors = 0;
+static unsigned char sector_t; /* sector in track */
+
+#ifdef DEBUGT
+static long unsigned debugtimer;
+#endif
+
+/*
+ * Debugging
+ * =========
+ */
+static inline void set_debugt(void)
+{
+#ifdef DEBUGT
+	debugtimer = jiffies;
+#endif
+}
+
+static inline void debugt(const char *message)
+{
+#ifdef DEBUGT
+	if (DP->flags & DEBUGT)
+		printk("%s dtime=%lu\n", message, jiffies-debugtimer);
+#endif
+}
+
+typedef void (*timeout_fn)(unsigned long);
+static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
+				       (timeout_fn) floppy_shutdown };
+
+static const char *timeout_message;
+
+#ifdef FLOPPY_SANITY_CHECK
+static void is_alive(const char *message)
+{
+	/* this routine checks whether the floppy driver is "alive" */
+	if (fdc_busy && command_status < 2 && !fd_timeout.prev){
+		DPRINT1("timeout handler died: %s\n",message);
+	}
+}
+#endif
+
+#ifdef FLOPPY_SANITY_CHECK
+
+#define OLOGSIZE 20
+
+static void (*lasthandler)(void) = NULL;
+static int interruptjiffies=0;
+static int resultjiffies=0;
+static int resultsize=0;
+static int lastredo=0;
+
+static struct output_log {
+	unsigned char data;
+	unsigned char status;
+	unsigned long jiffies;
+} output_log[OLOGSIZE];
+
+static int output_log_pos=0;
+#endif
+
+#define CURRENTD -1
+#define MAXTIMEOUT -2
+
+static void reschedule_timeout(int drive, const char *message, int marg)
+{
+	if (drive == CURRENTD)
+		drive = current_drive;
+	del_timer(&fd_timeout);
+	if (drive < 0 || drive > N_DRIVE) {
+		fd_timeout.expires = jiffies + 20*HZ;
+		drive=0;
+	} else
+		fd_timeout.expires = jiffies + UDP->timeout;
+	add_timer(&fd_timeout);
+	if (UDP->flags & FD_DEBUG){
+		DPRINT("reschedule timeout ");
+		printk(message, marg);
+		printk("\n");
+	}
+	timeout_message = message;
+}
+
+static int maximum(int a, int b)
+{
+	if(a > b)
+		return a;
+	else
+		return b;
+}
+#define INFBOUND(a,b) (a)=maximum((a),(b));
+
+static int minimum(int a, int b)
+{
+	if(a < b)
+		return a;
+	else
+		return b;
+}
+#define SUPBOUND(a,b) (a)=minimum((a),(b));
+
+
+/*
+ * Bottom half floppy driver.
+ * ==========================
+ *
+ * This part of the file contains the code talking directly to the hardware,
+ * and also the main service loop (seek-configure-spinup-command)
+ */
+
+/*
+ * disk change.
+ * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
+ * and the last_checked date.
+ *
+ * last_checked is the date of the last check which showed 'no disk change'
+ * FD_DISK_CHANGE is set under two conditions:
+ * 1. The floppy has been changed after some i/o to that floppy already
+ *    took place.
+ * 2. No floppy disk is in the drive. This is done in order to ensure that
+ *    requests are quickly flushed in case there is no disk in the drive. It
+ *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
+ *    the drive.
+ *
+ * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
+ * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
+ *  each seek. If a disk is present, the disk change line should also be
+ *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
+ *  change line is set, this means either that no disk is in the drive, or
+ *  that it has been removed since the last seek.
+ *
+ * This means that we really have a third possibility too:
+ *  The floppy has been changed after the last seek.
+ */
+
+static int disk_change(int drive)
+{
+	int fdc=FDC(drive);
+#ifdef FLOPPY_SANITY_CHECK
+	if (jiffies < UDP->select_delay + UDRS->select_date)
+		DPRINT("WARNING disk change called early\n");
+	if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
+	   (FDCS->dor & 3) != UNIT(drive) ||
+	   fdc != FDC(drive)){
+		DPRINT("probing disk change on unselected drive\n");
+		DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
+			FDCS->dor);
+	}
+#endif
+
+#ifdef DCL_DEBUG
+	if (UDP->flags & FD_DEBUG){
+		DPRINT1("checking disk change line for drive %d\n",drive);
+		DPRINT1("jiffies=%ld\n", jiffies);
+		DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
+		DPRINT1("flags=%x\n",UDRS->flags);
+	}
+#endif
+	if (UDP->flags & FD_BROKEN_DCL)
+		return UTESTF(FD_DISK_CHANGED);
+	if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
+		USETF(FD_VERIFY); /* verify write protection */
+		if (UDRS->maxblock){
+			/* mark it changed */
+			USETF(FD_DISK_CHANGED);
+
+			/* invalidate its geometry */
+			if (UDRS->keep_data >= 0) {
+				if ((UDP->flags & FTD_MSG) &&
+				    current_type[drive] != NULL)
+					DPRINT("Disk type is undefined after "
+					       "disk change\n");
+				current_type[drive] = NULL;
+				floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
+			}
+		}
+		/*USETF(FD_DISK_NEWCHANGE);*/
+		return 1;
+	} else {
+		UDRS->last_checked=jiffies;
+		UCLEARF(FD_DISK_NEWCHANGE);
+	}
+	return 0;
+}
+
+static inline int is_selected(int dor, int unit)
+{
+	return ((dor  & (0x10 << unit)) && (dor &3) == unit);
+}
+
+static int set_dor(int fdc, char mask, char data)
+{
+	register unsigned char drive, unit, newdor,olddor;
+
+	if (FDCS->address == -1)
+		return -1;
+
+	olddor = FDCS->dor;
+	newdor =  (olddor & mask) | data;
+	if (newdor != olddor){
+		unit = olddor & 0x3;
+		if (is_selected(olddor, unit) && !is_selected(newdor,unit)){
+			drive = REVDRIVE(fdc,unit);
+#ifdef DCL_DEBUG
+			if (UDP->flags & FD_DEBUG){
+				DPRINT("calling disk change from set_dor\n");
+			}
+#endif
+			disk_change(drive);
+		}
+		FDCS->dor = newdor;
+		fd_outb(newdor, FD_DOR);
+
+		unit = newdor & 0x3;
+		if (!is_selected(olddor, unit) && is_selected(newdor,unit)){
+			drive = REVDRIVE(fdc,unit);
+			UDRS->select_date = jiffies;
+		}
+	}
+	if (newdor & 0xf0)
+		floppy_grab_irq_and_dma();
+	if (olddor & 0xf0)
+		floppy_release_irq_and_dma();
+	return olddor;
+}
+
+static void twaddle(void)
+{
+	if (DP->select_delay)
+		return;
+	fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
+	fd_outb(FDCS->dor, FD_DOR);
+	DRS->select_date = jiffies;
+}
+
+/* reset all driver information about the current fdc. This is needed after
+ * a reset, and after a raw command. */
+static void reset_fdc_info(int mode)
+{
+	int drive;
+
+	FDCS->spec1 = FDCS->spec2 = -1;
+	FDCS->need_configure = 1;
+	FDCS->perp_mode = 1;
+	FDCS->rawcmd = 0;
+	for (drive = 0; drive < N_DRIVE; drive++)
+		if (FDC(drive) == fdc &&
+		    (mode || UDRS->track != NEED_1_RECAL))
+			UDRS->track = NEED_2_RECAL;
+}
+
+/* selects the fdc and drive, and enables the fdc's input/dma. */
+static void set_fdc(int drive)
+{
+	if (drive >= 0 && drive < N_DRIVE){
+		fdc = FDC(drive);
+		current_drive = drive;
+	}
+	if (fdc != 1 && fdc != 0) {
+		printk("bad fdc value\n");
+		return;
+	}
+	set_dor(fdc,~0,8);
+	set_dor(1-fdc, ~8, 0);
+	if (FDCS->rawcmd == 2)
+		reset_fdc_info(1);
+	if (fd_inb(FD_STATUS) != STATUS_READY)
+		FDCS->reset = 1;
+}
+
+/* locks the driver */
+static int lock_fdc(int drive, int interruptible)
+{
+	if (!usage_count){
+		printk("trying to lock fdc while usage count=0\n");
+		return -1;
+	}
+	floppy_grab_irq_and_dma();
+	cli();
+	while (fdc_busy && NO_SIGNAL)
+		interruptible_sleep_on(&fdc_wait);
+	if (fdc_busy){
+		sti();
+		return -EINTR;
+	}
+	fdc_busy = 1;
+	sti();
+	command_status = FD_COMMAND_NONE;
+	reschedule_timeout(drive, "lock fdc", 0);
+	set_fdc(drive);
+	return 0;
+}
+
+#define LOCK_FDC(drive,interruptible) \
+if (lock_fdc(drive,interruptible)) return -EINTR;
+
+
+/* unlocks the driver */
+static inline void unlock_fdc(void)
+{
+	raw_cmd = 0;
+	if (!fdc_busy)
+		DPRINT("FDC access conflict!\n");
+
+	if (DEVICE_INTR)
+		DPRINT1("device interrupt still active at FDC release: %p!\n",
+			DEVICE_INTR);
+	command_status = FD_COMMAND_NONE;
+	del_timer(&fd_timeout);
+	cont = NULL;
+	fdc_busy = 0;
+	floppy_release_irq_and_dma();
+	wake_up(&fdc_wait);
+}
+
+/* switches the motor off after a given timeout */
+static void motor_off_callback(unsigned long nr)
+{
+	unsigned char mask = ~(0x10 << UNIT(nr));
+
+	set_dor(FDC(nr), mask, 0);
+}
+
+static struct timer_list motor_off_timer[N_DRIVE] = {
+	{ NULL, NULL, 0, 0, motor_off_callback },
+	{ NULL, NULL, 0, 1, motor_off_callback },
+	{ NULL, NULL, 0, 2, motor_off_callback },
+	{ NULL, NULL, 0, 3, motor_off_callback },
+	{ NULL, NULL, 0, 4, motor_off_callback },
+	{ NULL, NULL, 0, 5, motor_off_callback },
+	{ NULL, NULL, 0, 6, motor_off_callback },
+	{ NULL, NULL, 0, 7, motor_off_callback }
+};
+
+/* schedules motor off */
+static void floppy_off(unsigned int drive)
+{
+	unsigned long volatile delta;
+	register int fdc=FDC(drive);
+
+	if (!(FDCS->dor & (0x10 << UNIT(drive))))
+		return;
+
+	del_timer(motor_off_timer+drive);
+
+	/* make spindle stop in a position which minimizes spinup time
+	 * next time */
+	if (UDP->rps){
+		delta = jiffies - UDRS->first_read_date + HZ -
+			UDP->spindown_offset;
+		delta = ((delta * UDP->rps) % HZ) / UDP->rps;
+		motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
+	}
+	add_timer(motor_off_timer+drive);
+}
+
+/*
+ * cycle through all N_DRIVE floppy drives, for disk change testing.
+ * stopping at current drive. This is done before any long operation, to
+ * be sure to have up to date disk change information.
+ */
+static void scandrives(void)
+{
+	int i, drive, saved_drive;
+
+	if (DP->select_delay)
+		return;
+
+	saved_drive = current_drive;
+	for (i=0; i < N_DRIVE; i++){
+		drive = (saved_drive + i + 1) % N_DRIVE;
+		if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
+			continue; /* skip closed drives */
+		set_fdc(drive);
+		if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
+		      (0x10 << UNIT(drive))))
+			/* switch the motor off again, if it was off to
+			 * begin with */
+			set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
+	}
+	set_fdc(saved_drive);
+}
+
+static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
+
+/* this function makes sure that the disk stays in the drive during the
+ * transfer */
+static void fd_watchdog(void)
+{
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG){
+		DPRINT("calling disk change from watchdog\n");
+	}
+#endif
+
+	if (disk_change(current_drive)){
+		DPRINT("disk removed during i/o\n");
+		floppy_shutdown();
+	} else {
+		del_timer(&fd_timer);
+		fd_timer.function = (timeout_fn) fd_watchdog;
+		fd_timer.expires = jiffies + HZ / 10;
+		add_timer(&fd_timer);
+	}
+}
+
+static void main_command_interrupt(void)
+{
+	del_timer(&fd_timer);
+	cont->interrupt();
+}
+
+/* waits for a delay (spinup or select) to pass */
+static int wait_for_completion(int delay, timeout_fn function)
+{
+	if (FDCS->reset){
+		reset_fdc(); /* do the reset during sleep to win time
+			      * if we don't need to sleep, it's a good
+			      * occasion anyways */
+		return 1;
+	}
+
+	if (jiffies < delay){
+		del_timer(&fd_timer);
+		fd_timer.function = function;
+		fd_timer.expires = delay;
+		add_timer(&fd_timer);
+		return 1;
+	}
+	return 0;
+}
+
+static int hlt_disabled=0;
+static void floppy_disable_hlt(void)
+{
+	unsigned long flags;
+	save_flags(flags);
+	cli();
+	if (!hlt_disabled){
+		hlt_disabled=1;
+#ifdef HAVE_DISABLE_HLT
+		disable_hlt();
+#endif
+	}
+	restore_flags(flags);
+}
+
+static void floppy_enable_hlt(void)
+{
+	unsigned long flags;
+	save_flags(flags);
+	cli();
+	if (hlt_disabled){
+		hlt_disabled=0;
+#ifdef HAVE_DISABLE_HLT
+		enable_hlt();
+#endif
+	}
+	restore_flags(flags);
+}
+
+
+static void setup_DMA(void)
+{
+#ifdef FLOPPY_SANITY_CHECK
+	if (raw_cmd->length == 0){
+		int i;
+
+		printk("zero dma transfer size:");
+		for (i=0; i < raw_cmd->cmd_count; i++)
+			printk("%x,", raw_cmd->cmd[i]);
+		printk("\n");
+		cont->done(0);
+		FDCS->reset = 1;
+		return;
+	}
+	if ((long) raw_cmd->kernel_data % 512){
+		printk("non aligned address: %p\n", raw_cmd->kernel_data);
+		cont->done(0);
+		FDCS->reset=1;
+		return;
+	}
+	if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
+		printk("DMA crossing 64-K boundary %p-%p\n",
+		       raw_cmd->kernel_data,
+		       raw_cmd->kernel_data + raw_cmd->length);
+		cont->done(0);
+		FDCS->reset=1;
+		return;
+	}
+#endif
+	cli();
+	fd_disable_dma();
+	fd_clear_dma_ff();
+	fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
+			DMA_MODE_READ : DMA_MODE_WRITE);
+	fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
+	fd_set_dma_count(raw_cmd->length);
+	fd_enable_dma();
+	sti();
+	floppy_disable_hlt();
+}
+
+/* sends a command byte to the fdc */
+static int output_byte(char byte)
+{
+	int counter;
+	unsigned char status = 0;
+	unsigned char rstatus;
+
+	if (FDCS->reset)
+		return -1;
+	for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
+		rstatus = fd_inb(FD_STATUS);
+		status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
+		if (!(status & STATUS_READY))
+			continue;
+		if (status == STATUS_READY){
+			fd_outb(byte,FD_DATA);
+
+#ifdef FLOPPY_SANITY_CHECK
+			output_log[output_log_pos].data = byte;
+			output_log[output_log_pos].status = rstatus;
+			output_log[output_log_pos].jiffies = jiffies;
+			output_log_pos = (output_log_pos + 1) % OLOGSIZE;
+#endif
+			return 0;
+		} else
+			break;
+	}
+	FDCS->reset = 1;
+	if (!initialising)
+		DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
+			byte, status);
+	return -1;
+}
+#define LAST_OUT(x) if (output_byte(x)){ reset_fdc();return;}
+
+/* gets the response from the fdc */
+static int result(void)
+{
+	int i = 0, counter, status = 0;
+
+	if (FDCS->reset)
+		return -1;
+	for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
+		status = fd_inb(FD_STATUS)&
+			(STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
+		if (!(status & STATUS_READY))
+			continue;
+		if (status == STATUS_READY){
+#ifdef FLOPPY_SANITY_CHECK
+			resultjiffies = jiffies;
+			resultsize = i;
+#endif
+			return i;
+		}
+		if (status & STATUS_DMA)
+			break;
+		if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
+			if (i >= MAX_REPLIES) {
+				DPRINT("floppy_stat reply overrun\n");
+				break;
+			}
+			reply_buffer[i++] = fd_inb(FD_DATA);
+		}
+	}
+	FDCS->reset = 1;
+	if (!initialising)
+		DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
+			status, fdc, i);
+	return -1;
+}
+
+/* Set perpendicular mode as required, based on data rate, if supported.
+ * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
+ */
+static inline void perpendicular_mode(void)
+{
+	unsigned char perp_mode;
+
+	if (raw_cmd->rate & 0x40){
+		switch(raw_cmd->rate & 3){
+			case 0:
+				perp_mode=2;
+				break;
+			case 3:
+				perp_mode=3;
+				break;
+			default:
+				DPRINT("Invalid data rate for perpendicular mode!\n");
+				cont->done(0);
+				FDCS->reset = 1; /* convenient way to return to
+						  * redo without to much hassle (deep
+						  * stack et al. */
+				return;
+		}
+	} else
+		perp_mode = 0;
+
+	if (FDCS->perp_mode == perp_mode)
+		return;
+	if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
+		output_byte(FD_PERPENDICULAR);
+		output_byte(perp_mode);
+		FDCS->perp_mode = perp_mode;
+	} else if (perp_mode) {
+		DPRINT("perpendicular mode not supported by this FDC.\n");
+	}
+} /* perpendicular_mode */
+
+#define NOMINAL_DTR 500
+
+/* Issue a "SPECIFY" command to set the step rate time, head unload time,
+ * head load time, and DMA disable flag to values needed by floppy.
+ *
+ * The value "dtr" is the data transfer rate in Kbps.  It is needed
+ * to account for the data rate-based scaling done by the 82072 and 82077
+ * FDC types.  This parameter is ignored for other types of FDCs (i.e.
+ * 8272a).
+ *
+ * Note that changing the data transfer rate has a (probably deleterious)
+ * effect on the parameters subject to scaling for 82072/82077 FDCs, so
+ * fdc_specify is called again after each data transfer rate
+ * change.
+ *
+ * srt: 1000 to 16000 in microseconds
+ * hut: 16 to 240 milliseconds
+ * hlt: 2 to 254 milliseconds
+ *
+ * These values are rounded up to the next highest available delay time.
+ */
+static void fdc_specify(void)
+{
+	unsigned char spec1, spec2;
+	int srt, hlt, hut;
+	unsigned long dtr = NOMINAL_DTR;
+	unsigned long scale_dtr = NOMINAL_DTR;
+	int hlt_max_code = 0x7f;
+	int hut_max_code = 0xf;
+
+	if (FDCS->need_configure && FDCS->has_fifo) {
+		if (FDCS->reset)
+			return;
+		/* Turn on FIFO for 82077-class FDC (improves performance) */
+		/* TODO: lock this in via LOCK during initialization */
+		output_byte(FD_CONFIGURE);
+		output_byte(0);
+		output_byte(0x2A);	/* FIFO on, polling off, 10 byte threshold */
+		output_byte(0);		/* precompensation from track 0 upwards */
+		if (FDCS->reset){
+			FDCS->has_fifo=0;
+			return;
+		}
+		FDCS->need_configure = 0;
+		/*DPRINT("FIFO enabled\n");*/
+	}
+
+	switch (raw_cmd->rate & 0x03) {
+		case 3:
+			dtr = 1000;
+			break;
+		case 1:
+			dtr = 300;
+			break;
+		case 2:
+			dtr = 250;
+			break;
+	}
+
+	if (FDCS->version >= FDC_82072) {
+		scale_dtr = dtr;
+		hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
+		hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
+	}
+
+	/* Convert step rate from microseconds to milliseconds and 4 bits */
+	srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
+	SUPBOUND(srt, 0xf);
+	INFBOUND(srt, 0);
+
+	hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
+	if (hlt < 0x01)
+		hlt = 0x01;
+	else if (hlt > 0x7f)
+		hlt = hlt_max_code;
+
+	hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
+	if (hut < 0x1)
+		hut = 0x1;
+	else if (hut > 0xf)
+		hut = hut_max_code;
+
+	spec1 = (srt << 4) | hut;
+	spec2 = (hlt << 1);
+
+	/* If these parameters did not change, just return with success */
+	if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
+		/* Go ahead and set spec1 and spec2 */
+		output_byte(FD_SPECIFY);
+		output_byte(FDCS->spec1 = spec1);
+		output_byte(FDCS->spec2 = spec2);
+	}
+} /* fdc_specify */
+
+/* Set the FDC's data transfer rate on behalf of the specified drive.
+ * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
+ * of the specify command (i.e. using the fdc_specify function).
+ */
+static int fdc_dtr(void)
+{
+	/* If data rate not already set to desired value, set it. */
+	if ((raw_cmd->rate & 3) == FDCS->dtr)
+		return 0;
+
+	/* Set dtr */
+	fd_outb(raw_cmd->rate & 3, FD_DCR);
+
+	/* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
+	 * need a stabilization period of several milliseconds to be
+	 * enforced after data rate changes before R/W operations.
+	 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
+	 */
+	FDCS->dtr = raw_cmd->rate & 3;
+	return(wait_for_completion(jiffies+2*HZ/100,
+				   (timeout_fn) floppy_ready));
+} /* fdc_dtr */
+
+static void tell_sector(void)
+{
+	printk(": track %d, head %d, sector %d, size %d",
+	       R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
+} /* tell_sector */
+
+
+/*
+ * Ok, this error interpreting routine is called after a
+ * DMA read/write has succeeded
+ * or failed, so we check the results, and copy any buffers.
+ * hhb: Added better error reporting.
+ * ak: Made this into a separate routine.
+ */
+static int interpret_errors(void)
+{
+	char bad;
+
+	if (inr!=7) {
+		DPRINT("-- FDC reply error");
+		FDCS->reset = 1;
+		return 1;
+	}
+
+	/* check IC to find cause of interrupt */
+	switch (ST0 & ST0_INTR) {
+		case 0x40:	/* error occurred during command execution */
+			bad = 1;
+			if (ST1 & ST1_WP) {
+				DPRINT("Drive is write protected\n");
+				CLEARF(FD_DISK_WRITABLE);
+				cont->done(0);
+				bad = 2;
+			} else if (ST1 & ST1_ND) {
+				SETF(FD_NEED_TWADDLE);
+			} else if (ST1 & ST1_OR) {
+				if (DP->flags & FTD_MSG)
+					DPRINT("Over/Underrun - retrying\n");
+				bad = 0;
+			}else if (*errors >= DP->max_errors.reporting){
+				DPRINT("");
+				if (ST0 & ST0_ECE) {
+					printk("Recalibrate failed!");
+				} else if (ST2 & ST2_CRC) {
+					printk("data CRC error");
+					tell_sector();
+				} else if (ST1 & ST1_CRC) {
+					printk("CRC error");
+					tell_sector();
+				} else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
+					if (!probing) {
+						printk("sector not found");
+						tell_sector();
+					} else
+						printk("probe failed...");
+				} else if (ST2 & ST2_WC) {	/* seek error */
+					printk("wrong cylinder");
+				} else if (ST2 & ST2_BC) {	/* cylinder marked as bad */
+					printk("bad cylinder");
+				} else {
+					printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
+					tell_sector();
+				}
+				printk("\n");
+
+			}
+			if (ST2 & ST2_WC || ST2 & ST2_BC)
+				/* wrong cylinder => recal */
+				DRS->track = NEED_2_RECAL;
+			return bad;
+		case 0x80: /* invalid command given */
+			DPRINT("Invalid FDC command given!\n");
+			cont->done(0);
+			return 2;
+		case 0xc0:
+			DPRINT("Abnormal termination caused by polling\n");
+			cont->error();
+			return 2;
+		default: /* (0) Normal command termination */
+			return 0;
+	}
+}
+
+/*
+ * This routine is called when everything should be correctly set up
+ * for the transfer (ie floppy motor is on, the correct floppy is
+ * selected, and the head is sitting on the right track).
+ */
+static void setup_rw_floppy(void)
+{
+	int i,ready_date,r, flags,dflags;
+	timeout_fn function;
+
+	flags = raw_cmd->flags;
+	if (flags & (FD_RAW_READ | FD_RAW_WRITE))
+		flags |= FD_RAW_INTR;
+
+	if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
+		ready_date = DRS->spinup_date + DP->spinup;
+		/* If spinup will take a long time, rerun scandrives
+		 * again just before spinup completion. Beware that
+		 * after scandrives, we must again wait for selection.
+		 */
+		if (ready_date > jiffies + DP->select_delay){
+			ready_date -= DP->select_delay;
+			function = (timeout_fn) floppy_start;
+		} else
+			function = (timeout_fn) setup_rw_floppy;
+
+		/* wait until the floppy is spinning fast enough */
+		if (wait_for_completion(ready_date,function))
+			return;
+	}
+	dflags = DRS->flags;
+
+	if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
+		setup_DMA();
+
+	if (flags & FD_RAW_INTR)
+		SET_INTR(main_command_interrupt);
+
+	r=0;
+	for (i=0; i< raw_cmd->cmd_count; i++)
+		r|=output_byte(raw_cmd->cmd[i]);
+
+#ifdef DEBUGT
+	debugt("rw_command: ");
+#endif
+	if (r){
+		reset_fdc();
+		return;
+	}
+
+	if (!(flags & FD_RAW_INTR)){
+		inr = result();
+		cont->interrupt();
+	} else if (flags & FD_RAW_NEED_DISK)
+		fd_watchdog();
+}
+
+static int blind_seek;
+
+/*
+ * This is the routine called after every seek (or recalibrate) interrupt
+ * from the floppy controller.
+ */
+static void seek_interrupt(void)
+{
+#ifdef DEBUGT
+	debugt("seek interrupt:");
+#endif
+	if (inr != 2 || (ST0 & 0xF8) != 0x20) {
+		DPRINT("seek failed\n");
+		DRS->track = NEED_2_RECAL;
+		cont->error();
+		cont->redo();
+		return;
+	}
+	if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
+#ifdef DCL_DEBUG
+		if (DP->flags & FD_DEBUG){
+			DPRINT("clearing NEWCHANGE flag because of effective seek\n");
+			DPRINT1("jiffies=%ld\n", jiffies);
+		}
+#endif
+		CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
+		DRS->select_date = jiffies;
+	}
+	DRS->track = ST1;
+	floppy_ready();
+}
+
+static void check_wp(void)
+{
+	if (TESTF(FD_VERIFY)) {
+		/* check write protection */
+		output_byte(FD_GETSTATUS);
+		output_byte(UNIT(current_drive));
+		if (result() != 1){
+			FDCS->reset = 1;
+			return;
+		}
+		CLEARF(FD_VERIFY);
+		CLEARF(FD_NEED_TWADDLE);
+#ifdef DCL_DEBUG
+		if (DP->flags & FD_DEBUG){
+			DPRINT("checking whether disk is write protected\n");
+			DPRINT1("wp=%x\n",ST3 & 0x40);
+		}
+#endif
+		if (!(ST3  & 0x40))
+			SETF(FD_DISK_WRITABLE);
+		else
+			CLEARF(FD_DISK_WRITABLE);
+	}
+}
+
+static void seek_floppy(void)
+{
+	int track;
+
+	blind_seek=0;
+
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG){
+		DPRINT("calling disk change from seek\n");
+	}
+#endif
+
+	if (!TESTF(FD_DISK_NEWCHANGE) &&
+	    disk_change(current_drive) &&
+	    (raw_cmd->flags & FD_RAW_NEED_DISK)){
+		/* the media changed flag should be cleared after the seek.
+		 * If it isn't, this means that there is really no disk in
+		 * the drive.
+		 */
+		SETF(FD_DISK_CHANGED);
+		cont->done(0);
+		cont->redo();
+		return;
+	}
+	if (DRS->track <= NEED_1_RECAL){
+		recalibrate_floppy();
+		return;
+	} else if (TESTF(FD_DISK_NEWCHANGE) &&
+		   (raw_cmd->flags & FD_RAW_NEED_DISK) &&
+		   (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
+		/* we seek to clear the media-changed condition. Does anybody
+		 * know a more elegant way, which works on all drives? */
+		if (raw_cmd->track)
+			track = raw_cmd->track - 1;
+		else {
+			if (DP->flags & FD_SILENT_DCL_CLEAR){
+				set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
+				blind_seek = 1;
+				raw_cmd->flags |= FD_RAW_NEED_SEEK;
+			}
+			track = 1;
+		}
+	} else {
+		check_wp();
+		if (raw_cmd->track != DRS->track &&
+		    (raw_cmd->flags & FD_RAW_NEED_SEEK))
+			track = raw_cmd->track;
+		else {
+			setup_rw_floppy();
+			return;
+		}
+	}
+
+	SET_INTR(seek_interrupt);
+	output_byte(FD_SEEK);
+	output_byte(UNIT(current_drive));
+	LAST_OUT(track);
+#ifdef DEBUGT
+	debugt("seek command:");
+#endif
+}
+
+static void recal_interrupt(void)
+{
+#ifdef DEBUGT
+	debugt("recal interrupt:");
+#endif
+	if (inr !=2)
+		FDCS->reset = 1;
+	else if (ST0 & ST0_ECE) {
+	       	switch(DRS->track){
+			case NEED_1_RECAL:
+#ifdef DEBUGT
+				debugt("recal interrupt need 1 recal:");
+#endif
+				/* after a second recalibrate, we still haven't
+				 * reached track 0. Probably no drive. Raise an
+				 * error, as failing immediately might upset
+				 * computers possessed by the Devil :-) */
+				cont->error();
+				cont->redo();
+				return;
+			case NEED_2_RECAL:
+#ifdef DEBUGT
+				debugt("recal interrupt need 2 recal:");
+#endif
+				/* If we already did a recalibrate,
+				 * and we are not at track 0, this
+				 * means we have moved. (The only way
+				 * not to move at recalibration is to
+				 * be already at track 0.) Clear the
+				 * new change flag */
+#ifdef DCL_DEBUG
+				if (DP->flags & FD_DEBUG){
+					DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
+				}
+#endif
+
+				CLEARF(FD_DISK_NEWCHANGE);
+				DRS->select_date = jiffies;
+				/* fall through */
+			default:
+#ifdef DEBUGT
+				debugt("recal interrupt default:");
+#endif
+				/* Recalibrate moves the head by at
+				 * most 80 steps. If after one
+				 * recalibrate we don't have reached
+				 * track 0, this might mean that we
+				 * started beyond track 80.  Try
+				 * again.  */
+				DRS->track = NEED_1_RECAL;
+				break;
+		}
+	} else
+		DRS->track = ST1;
+	floppy_ready();
+}
+
+/*
+ * Unexpected interrupt - Print as much debugging info as we can...
+ * All bets are off...
+ */
+static void unexpected_floppy_interrupt(void)
+{
+	int i;
+	if (initialising)
+		return;
+	if (print_unex){
+		DPRINT("unexpected interrupt\n");
+		if (inr >= 0)
+			for (i=0; i<inr; i++)
+				printk("%d %x\n", i, reply_buffer[i]);
+	}
+	while(1){
+		output_byte(FD_SENSEI);
+		inr=result();
+		if (inr != 2)
+			break;
+		if (print_unex){
+			printk("sensei\n");
+			for (i=0; i<inr; i++)
+				printk("%d %x\n", i, reply_buffer[i]);
+		}
+	}
+	FDCS->reset = 1;
+}
+
+static struct tq_struct floppy_tq =
+{ 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
+
+/* interrupt handler */
+static void floppy_interrupt(int irq, struct pt_regs * regs)
+{
+	void (*handler)(void) = DEVICE_INTR;
+
+	lasthandler = handler;
+	interruptjiffies = jiffies;
+
+	floppy_enable_hlt();
+	CLEAR_INTR;
+	if (fdc >= N_FDC || FDCS->address == -1){
+		/* we don't even know which FDC is the culprit */
+		printk("DOR0=%x\n", fdc_state[0].dor);
+		printk("floppy interrupt on bizarre fdc %d\n",fdc);
+		printk("handler=%p\n", handler);
+		is_alive("bizarre fdc");
+		return;
+	}
+	inr = result();
+	if (!handler){
+		unexpected_floppy_interrupt();
+		is_alive("unexpected");
+		return;
+	}
+	if (inr == 0){
+		do {
+			output_byte(FD_SENSEI);
+			inr = result();
+		} while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
+	}
+	floppy_tq.routine = (void *)(void *) handler;
+	queue_task_irq(&floppy_tq, &tq_timer);
+	is_alive("normal interrupt end");
+}
+
+static void recalibrate_floppy(void)
+{
+#ifdef DEBUGT
+	debugt("recalibrate floppy:");
+#endif
+	SET_INTR(recal_interrupt);
+	output_byte(FD_RECALIBRATE);
+	LAST_OUT(UNIT(current_drive));
+}
+
+/*
+ * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
+ */
+static void reset_interrupt(void)
+{
+#ifdef DEBUGT
+	debugt("reset interrupt:");
+#endif
+	/* fdc_specify();	   reprogram fdc */
+	result();		/* get the status ready for set_fdc */
+	if (FDCS->reset) {
+		printk("reset set in interrupt, calling %p\n", cont->error);
+		cont->error(); /* a reset just after a reset. BAD! */
+	}
+	cont->redo();
+}
+
+/*
+ * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
+ * or by setting the self clearing bit 7 of STATUS (newer FDC's)
+ */
+static void reset_fdc(void)
+{
+	SET_INTR(reset_interrupt);
+	FDCS->reset = 0;
+	reset_fdc_info(0);
+	if (FDCS->version >= FDC_82077)
+		fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
+	else {
+		fd_outb(FDCS->dor & ~0x04, FD_DOR);
+		udelay(FD_RESET_DELAY);
+		outb(FDCS->dor, FD_DOR);
+	}
+}
+
+static void empty(void)
+{
+}
+
+void show_floppy(void)
+{
+	int i;
+
+	printk("\n");
+	printk("floppy driver state\n");
+	printk("-------------------\n");
+	printk("now=%ld last interrupt=%d last called handler=%p\n",
+	       jiffies, interruptjiffies, lasthandler);
+
+
+#ifdef FLOPPY_SANITY_CHECK
+	printk("timeout_message=%s\n", timeout_message);
+	printk("last output bytes:\n");
+	for (i=0; i < OLOGSIZE; i++)
+		printk("%2x %2x %ld\n",
+		       output_log[(i+output_log_pos) % OLOGSIZE].data,
+		       output_log[(i+output_log_pos) % OLOGSIZE].status,
+		       output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
+	printk("last result at %d\n", resultjiffies);
+	printk("last redo_fd_request at %d\n", lastredo);
+	for (i=0; i<resultsize; i++){
+		printk("%2x ", reply_buffer[i]);
+	}
+	printk("\n");
+#endif
+
+	printk("status=%x\n", fd_inb(FD_STATUS));
+	printk("fdc_busy=%d\n", fdc_busy);
+	if (DEVICE_INTR)
+		printk("DEVICE_INTR=%p\n", DEVICE_INTR);
+	if (floppy_tq.sync)
+		printk("floppy_tq.routine=%p\n", floppy_tq.routine);
+	if (fd_timer.prev)
+		printk("fd_timer.function=%p\n", fd_timer.function);
+	if (fd_timeout.prev){
+		printk("timer_table=%p\n",fd_timeout.function);
+		printk("expires=%ld\n",fd_timeout.expires-jiffies);
+		printk("now=%ld\n",jiffies);
+	}
+	printk("cont=%p\n", cont);
+	printk("CURRENT=%p\n", CURRENT);
+	printk("command_status=%d\n", command_status);
+	printk("\n");
+}
+
+static void floppy_shutdown(void)
+{
+	if (!initialising)
+		show_floppy();
+	CLEAR_INTR;
+	floppy_tq.routine = (void *)(void *) empty;
+	del_timer(&fd_timer);
+	sti();
+
+	floppy_enable_hlt();
+	fd_disable_dma();
+	/* avoid dma going to a random drive after shutdown */
+
+	if (!initialising)
+		DPRINT("floppy timeout\n");
+	FDCS->reset = 1;
+	if (cont){
+		cont->done(0);
+		cont->redo(); /* this will recall reset when needed */
+	} else {
+		printk("no cont in shutdown!\n");
+		process_fd_request();
+	}
+	is_alive("floppy shutdown");
+}
+/*typedef void (*timeout_fn)(unsigned long);*/
+
+/* start motor, check media-changed condition and write protection */
+static int start_motor(void (*function)(void) )
+{
+	int mask, data;
+
+	mask = 0xfc;
+	data = UNIT(current_drive);
+	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
+		if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
+			set_debugt();
+			/* no read since this drive is running */
+			DRS->first_read_date = 0;
+			/* note motor start time if motor is not yet running */
+			DRS->spinup_date = jiffies;
+			data |= (0x10 << UNIT(current_drive));
+		}
+	} else
+		if (FDCS->dor & (0x10 << UNIT(current_drive)))
+			mask &= ~(0x10 << UNIT(current_drive));
+
+	/* starts motor and selects floppy */
+	del_timer(motor_off_timer + current_drive);
+	set_dor(fdc, mask, data);
+
+	/* wait_for_completion also schedules reset if needed. */
+	return(wait_for_completion(DRS->select_date+DP->select_delay,
+				   (timeout_fn) function));
+}
+
+static void floppy_ready(void)
+{
+	CHECK_RESET;
+	if (start_motor(floppy_ready)) return;
+	if (fdc_dtr()) return;
+
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG){
+		DPRINT("calling disk change from floppy_ready\n");
+	}
+#endif
+
+	if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
+	   disk_change(current_drive) &&
+	   !DP->select_delay)
+		twaddle(); /* this clears the dcl on certain drive/controller
+			    * combinations */
+
+	if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
+		perpendicular_mode();
+		fdc_specify(); /* must be done here because of hut, hlt ... */
+		seek_floppy();
+	} else
+		setup_rw_floppy();
+}
+
+static void floppy_start(void)
+{
+	reschedule_timeout(CURRENTD, "floppy start", 0);
+
+	scandrives();
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG){
+		DPRINT("setting NEWCHANGE in floppy_start\n");
+	}
+#endif
+	SETF(FD_DISK_NEWCHANGE);
+	floppy_ready();
+}
+
+/*
+ * ========================================================================
+ * here ends the bottom half. Exported routines are:
+ * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
+ * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
+ * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
+ * and set_dor.
+ * ========================================================================
+ */
+/*
+ * General purpose continuations.
+ * ==============================
+ */
+
+static void do_wakeup(void)
+{
+	reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
+	cont = 0;
+	command_status += 2;
+	wake_up(&command_done);
+}
+
+static struct cont_t wakeup_cont={
+	empty,
+	do_wakeup,
+	empty,
+	(done_f)empty
+};
+
+static int wait_til_done(void (*handler)(void), int interruptible)
+{
+	int ret;
+
+	floppy_tq.routine = (void *)(void *) handler;
+	queue_task(&floppy_tq, &tq_timer);
+
+	cli();
+	while(command_status < 2 && NO_SIGNAL){
+		is_alive("wait_til_done");
+		if (interruptible)
+			interruptible_sleep_on(&command_done);
+		else
+			sleep_on(&command_done);
+	}
+	if (command_status < 2){
+		floppy_shutdown();
+		sti();
+		process_fd_request();
+		return -EINTR;
+	}
+	sti();
+
+	if (FDCS->reset)
+		command_status = FD_COMMAND_ERROR;
+	if (command_status == FD_COMMAND_OKAY)
+		ret=0;
+	else
+		ret=-EIO;
+	command_status = FD_COMMAND_NONE;
+	return ret;
+}
+
+static void generic_done(int result)
+{
+	command_status = result;
+	cont = &wakeup_cont;
+}
+
+static void generic_success(void)
+{
+	cont->done(1);
+}
+
+static void generic_failure(void)
+{
+	cont->done(0);
+}
+
+static void success_and_wakeup(void)
+{
+	generic_success();
+	cont->redo();
+}
+
+
+/*
+ * formatting and rw support.
+ * ==========================
+ */
+
+static int next_valid_format(void)
+{
+	int probed_format;
+
+	probed_format = DRS->probed_format;
+	while(1){
+		if (probed_format >= 8 ||
+		     !DP->autodetect[probed_format]){
+			DRS->probed_format = 0;
+			return 1;
+		}
+		if (floppy_type[DP->autodetect[probed_format]].sect){
+			DRS->probed_format = probed_format;
+			return 0;
+		}
+		probed_format++;
+	}
+}
+
+static void bad_flp_intr(void)
+{
+	if (probing){
+		DRS->probed_format++;
+		if (!next_valid_format())
+			return;
+	}
+	(*errors)++;
+	INFBOUND(DRWE->badness, *errors);
+	if (*errors > DP->max_errors.abort)
+		cont->done(0);
+	if (*errors > DP->max_errors.reset)
+		FDCS->reset = 1;
+	else if (*errors > DP->max_errors.recal)
+		DRS->track = NEED_2_RECAL;
+}
+
+static void set_floppy(kdev_t device)
+{
+	if (TYPE(device))
+		floppy = TYPE(device) + floppy_type;
+	else
+		floppy = current_type[ DRIVE(device) ];
+}
+
+/*
+ * formatting and support.
+ * =======================
+ */
+static void format_interrupt(void)
+{
+	switch (interpret_errors()){
+		case 1:
+			cont->error();
+		case 2:
+			break;
+		case 0:
+			cont->done(1);
+	}
+	cont->redo();
+}
+
+#define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
+#define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
+#define CT(x) ((x) | 0x40)
+static void setup_format_params(int track)
+{
+	struct fparm {
+		unsigned char track,head,sect,size;
+	} *here = (struct fparm *)floppy_track_buffer;
+	int il,n;
+	int count,head_shift,track_shift;
+
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->track = track;
+
+	raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
+		/*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
+	raw_cmd->rate = floppy->rate & 0x43;
+	raw_cmd->cmd_count = NR_F;
+	COMMAND = FM_MODE(floppy,FD_FORMAT);
+	DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
+	F_SIZECODE = FD_SIZECODE(floppy);
+	F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
+	F_GAP = floppy->fmt_gap;
+	F_FILL = FD_FILL_BYTE;
+
+	raw_cmd->kernel_data = floppy_track_buffer;
+	raw_cmd->length = 4 * F_SECT_PER_TRACK;
+
+	/* allow for about 30ms for data transport per track */
+	head_shift  = (F_SECT_PER_TRACK + 5) / 6;
+
+	/* a ``cylinder'' is two tracks plus a little stepping time */
+	track_shift = 2 * head_shift + 3;
+
+	/* position of logical sector 1 on this track */
+	n = (track_shift * format_req.track + head_shift * format_req.head)
+		% F_SECT_PER_TRACK;
+
+	/* determine interleave */
+	il = 1;
+	if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
+		il++;
+
+	/* initialize field */
+	for (count = 0; count < F_SECT_PER_TRACK; ++count) {
+		here[count].track = format_req.track;
+		here[count].head = format_req.head;
+		here[count].sect = 0;
+		here[count].size = F_SIZECODE;
+	}
+	/* place logical sectors */
+	for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
+		here[n].sect = count;
+		n = (n+il) % F_SECT_PER_TRACK;
+		if (here[n].sect) { /* sector busy, find next free sector */
+			++n;
+			if (n>= F_SECT_PER_TRACK) {
+				n-=F_SECT_PER_TRACK;
+				while (here[n].sect) ++n;
+			}
+		}
+	}
+}
+
+static void redo_format(void)
+{
+	buffer_track = -1;
+	setup_format_params(format_req.track << STRETCH(floppy));
+	floppy_start();
+#ifdef DEBUGT
+	debugt("queue format request");
+#endif
+}
+
+static struct cont_t format_cont={
+	format_interrupt,
+	redo_format,
+	bad_flp_intr,
+	generic_done };
+
+static int do_format(kdev_t device, struct format_descr *tmp_format_req)
+{
+	int ret;
+	int drive=DRIVE(device);
+
+	LOCK_FDC(drive,1);
+	set_floppy(device);
+	if (!floppy ||
+	    floppy->track > DP->tracks ||
+	    tmp_format_req->track >= floppy->track ||
+	    tmp_format_req->head >= floppy->head ||
+	    (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
+	    !floppy->fmt_gap) {
+		process_fd_request();
+		return -EINVAL;
+	}
+	format_req = *tmp_format_req;
+	format_errors = 0;
+	cont = &format_cont;
+	errors = &format_errors;
+	IWAIT(redo_format);
+	process_fd_request();
+	return ret;
+}
+
+/*
+ * Buffer read/write and support
+ * =============================
+ */
+
+/* new request_done. Can handle physical sectors which are smaller than a
+ * logical buffer */
+static void request_done(int uptodate)
+{
+	int block;
+
+	probing = 0;
+	reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
+
+	if (!CURRENT){
+		DPRINT("request list destroyed in floppy request done\n");
+		return;
+	}
+	if (uptodate){
+		/* maintain values for invalidation on geometry
+		 * change */
+		block = current_count_sectors + CURRENT->sector;
+		INFBOUND(DRS->maxblock, block);
+		if (block > floppy->sect)
+			DRS->maxtrack = 1;
+
+		/* unlock chained buffers */
+		while (current_count_sectors && CURRENT &&
+		       current_count_sectors >= CURRENT->current_nr_sectors){
+			current_count_sectors -= CURRENT->current_nr_sectors;
+			CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
+			CURRENT->sector += CURRENT->current_nr_sectors;
+			end_request(1);
+		}
+		if (current_count_sectors && CURRENT){
+			/* "unlock" last subsector */
+			CURRENT->buffer += current_count_sectors <<9;
+			CURRENT->current_nr_sectors -= current_count_sectors;
+			CURRENT->nr_sectors -= current_count_sectors;
+			CURRENT->sector += current_count_sectors;
+			return;
+		}
+
+		if (current_count_sectors && !CURRENT)
+			DPRINT("request list destroyed in floppy request done\n");
+
+	} else {
+		if (CURRENT->cmd == WRITE) {
+			/* record write error information */
+			DRWE->write_errors++;
+			if (DRWE->write_errors == 1) {
+				DRWE->first_error_sector = CURRENT->sector;
+				DRWE->first_error_generation = DRS->generation;
+			}
+			DRWE->last_error_sector = CURRENT->sector;
+			DRWE->last_error_generation = DRS->generation;
+		}
+		end_request(0);
+	}
+}
+
+/* Interrupt handler evaluating the result of the r/w operation */
+static void rw_interrupt(void)
+{
+	int nr_sectors, ssize;
+
+	if (!DRS->first_read_date)
+		DRS->first_read_date = jiffies;
+
+	nr_sectors = 0;
+	CODE2SIZE;
+	nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
+		floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
+		(sector_t % floppy->sect) % ssize;
+
+#ifdef FLOPPY_SANITY_CHECK
+	if (nr_sectors > current_count_sectors + ssize -
+	     (current_count_sectors + sector_t) % ssize +
+	     sector_t % ssize){
+		DPRINT2("long rw: %x instead of %lx\n",
+			nr_sectors, current_count_sectors);
+		printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
+		printk("rh=%d h=%d\n", R_HEAD, HEAD);
+		printk("rt=%d t=%d\n", R_TRACK, TRACK);
+		printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
+		       sector_t, ssize);
+	}
+#endif
+	INFBOUND(nr_sectors,0);
+	SUPBOUND(current_count_sectors, nr_sectors);
+
+	switch (interpret_errors()){
+		case 2:
+			cont->redo();
+			return;
+		case 1:
+			if (!current_count_sectors){
+				cont->error();
+				cont->redo();
+				return;
+			}
+			break;
+		case 0:
+			if (!current_count_sectors){
+				cont->redo();
+				return;
+			}
+			current_type[current_drive] = floppy;
+			floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
+			break;
+	}
+
+	if (probing) {
+		if (DP->flags & FTD_MSG)
+			DPRINT2("Auto-detected floppy type %s in fd%d\n",
+				floppy->name,current_drive);
+		current_type[current_drive] = floppy;
+		floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
+		probing = 0;
+	}
+
+	if (CT(COMMAND) != FD_READ || 
+	     raw_cmd->kernel_data == CURRENT->buffer){
+		/* transfer directly from buffer */
+		cont->done(1);
+	} else if (CT(COMMAND) == FD_READ){
+		buffer_track = raw_cmd->track;
+		buffer_drive = current_drive;
+		INFBOUND(buffer_max, nr_sectors + sector_t);
+	}
+	cont->redo();
+}
+
+/* Compute maximal contiguous buffer size. */
+static int buffer_chain_size(void)
+{
+	struct buffer_head *bh;
+	int size;
+	char *base;
+
+	base = CURRENT->buffer;
+	size = CURRENT->current_nr_sectors << 9;
+	bh = CURRENT->bh;
+
+	if (bh){
+		bh = bh->b_reqnext;
+		while (bh && bh->b_data == base + size){
+			size += bh->b_size;
+			bh = bh->b_reqnext;
+		}
+	}
+	return size >> 9;
+}
+
+/* Compute the maximal transfer size */
+static int transfer_size(int ssize, int max_sector, int max_size)
+{
+	SUPBOUND(max_sector, sector_t + max_size);
+
+	/* alignment */
+	max_sector -= (max_sector % floppy->sect) % ssize;
+
+	/* transfer size, beginning not aligned */
+	current_count_sectors = max_sector - sector_t ;
+
+	return max_sector;
+}
+
+/*
+ * Move data from/to the track buffer to/from the buffer cache.
+ */
+static void copy_buffer(int ssize, int max_sector, int max_sector_2)
+{
+	int remaining; /* number of transferred 512-byte sectors */
+	struct buffer_head *bh;
+	char *buffer, *dma_buffer;
+	int size;
+
+	max_sector = transfer_size(ssize,
+				   minimum(max_sector, max_sector_2),
+				   CURRENT->nr_sectors);
+
+	if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
+	    buffer_max > sector_t + CURRENT->nr_sectors)
+		current_count_sectors = minimum(buffer_max - sector_t,
+						CURRENT->nr_sectors);
+
+	remaining = current_count_sectors << 9;
+#ifdef FLOPPY_SANITY_CHECK
+	if ((remaining >> 9) > CURRENT->nr_sectors  &&
+	    CT(COMMAND) == FD_WRITE){
+		DPRINT("in copy buffer\n");
+		printk("current_count_sectors=%ld\n", current_count_sectors);
+		printk("remaining=%d\n", remaining >> 9);
+		printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
+		printk("CURRENT->current_nr_sectors=%ld\n",
+		       CURRENT->current_nr_sectors);
+		printk("max_sector=%d\n", max_sector);
+		printk("ssize=%d\n", ssize);
+	}
+#endif
+
+	buffer_max = maximum(max_sector, buffer_max);
+
+	dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
+
+	bh = CURRENT->bh;
+	size = CURRENT->current_nr_sectors << 9;
+	buffer = CURRENT->buffer;
+
+	while (remaining > 0){
+		SUPBOUND(size, remaining);
+#ifdef FLOPPY_SANITY_CHECK
+		if (dma_buffer + size >
+		    floppy_track_buffer + (max_buffer_sectors << 10) ||
+		    dma_buffer < floppy_track_buffer){
+			DPRINT1("buffer overrun in copy buffer %d\n",
+				(int) ((floppy_track_buffer - dma_buffer) >>9));
+			printk("sector_t=%d buffer_min=%d\n",
+			       sector_t, buffer_min);
+			printk("current_count_sectors=%ld\n",
+			       current_count_sectors);
+			if (CT(COMMAND) == FD_READ)
+				printk("read\n");
+			if (CT(COMMAND) == FD_READ)
+				printk("write\n");
+			break;
+		}
+		if (((unsigned long)buffer) % 512)
+			DPRINT1("%p buffer not aligned\n", buffer);
+#endif
+		if (CT(COMMAND) == FD_READ) {
+			fd_cacheflush(dma_buffer, size);
+			memcpy(buffer, dma_buffer, size);
+		} else {
+			memcpy(dma_buffer, buffer, size);
+			fd_cacheflush(dma_buffer, size);
+		}
+		remaining -= size;
+		if (!remaining)
+			break;
+
+		dma_buffer += size;
+		bh = bh->b_reqnext;
+#ifdef FLOPPY_SANITY_CHECK
+		if (!bh){
+			DPRINT("bh=null in copy buffer after copy\n");
+			break;
+		}
+#endif
+		size = bh->b_size;
+		buffer = bh->b_data;
+	}
+#ifdef FLOPPY_SANITY_CHECK
+	if (remaining){
+		if (remaining > 0)
+			max_sector -= remaining >> 9;
+		DPRINT1("weirdness: remaining %d\n", remaining>>9);
+	}
+#endif
+}
+
+/*
+ * Formulate a read/write request.
+ * this routine decides where to load the data (directly to buffer, or to
+ * tmp floppy area), how much data to load (the size of the buffer, the whole
+ * track, or a single sector)
+ * All floppy_track_buffer handling goes in here. If we ever add track buffer
+ * allocation on the fly, it should be done here. No other part should need
+ * modification.
+ */
+
+static int make_raw_rw_request(void)
+{
+	int aligned_sector_t;
+	int max_sector, max_size, tracksize, ssize;
+
+	set_fdc(DRIVE(CURRENT->rq_dev));
+
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
+		FD_RAW_NEED_SEEK;
+	raw_cmd->cmd_count = NR_RW;
+	if (CURRENT->cmd == READ){
+		raw_cmd->flags |= FD_RAW_READ;
+		COMMAND = FM_MODE(floppy,FD_READ);
+	} else if (CURRENT->cmd == WRITE){
+		raw_cmd->flags |= FD_RAW_WRITE;
+		COMMAND = FM_MODE(floppy,FD_WRITE);
+	} else {
+		DPRINT("make_raw_rw_request: unknown command\n");
+		return 0;
+	}
+
+	max_sector = floppy->sect * floppy->head;
+
+	TRACK = CURRENT->sector / max_sector;
+	sector_t = CURRENT->sector % max_sector;
+	if (floppy->track && TRACK >= floppy->track)
+		return 0;
+	HEAD = sector_t / floppy->sect;
+
+	if (((floppy->stretch & FD_SWAPSIDES) || TESTF(FD_NEED_TWADDLE)) &&
+	    sector_t < floppy->sect)
+		max_sector = floppy->sect;
+
+	/* 2M disks have phantom sectors on the first track */
+	if ((floppy->rate & FD_2M) && (!TRACK) && (!HEAD)){
+		max_sector = 2 * floppy->sect / 3;
+		if (sector_t >= max_sector){
+			current_count_sectors = minimum(floppy->sect - sector_t,
+							CURRENT->nr_sectors);
+			return 1;
+		}
+		SIZECODE = 2;
+	} else
+		SIZECODE = FD_SIZECODE(floppy);
+	raw_cmd->rate = floppy->rate & 0x43;
+	if ((floppy->rate & FD_2M) &&
+	    (TRACK || HEAD) &&
+	    raw_cmd->rate == 2)
+		raw_cmd->rate = 1;
+
+	if (SIZECODE)
+		SIZECODE2 = 0xff;
+	else
+		SIZECODE2 = 0x80;
+	raw_cmd->track = TRACK << STRETCH(floppy);
+	DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
+	GAP = floppy->gap;
+	CODE2SIZE;
+	SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
+	SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
+	tracksize = floppy->sect - floppy->sect % ssize;
+	if (tracksize < floppy->sect){
+		SECT_PER_TRACK ++;
+		if (tracksize <= sector_t % floppy->sect)
+			SECTOR--;
+		while (tracksize <= sector_t % floppy->sect){
+			while(tracksize + ssize > floppy->sect){
+				SIZECODE--;
+				ssize >>= 1;
+			}
+			SECTOR++; SECT_PER_TRACK ++;
+			tracksize += ssize;
+		}
+		max_sector = HEAD * floppy->sect + tracksize;
+	} else if (!TRACK && !HEAD && !(floppy->rate & FD_2M) && probing)
+		max_sector = floppy->sect;
+
+	aligned_sector_t = sector_t - (sector_t % floppy->sect) % ssize;
+	max_size = CURRENT->nr_sectors;
+	if ((raw_cmd->track == buffer_track) && 
+	    (current_drive == buffer_drive) &&
+	    (sector_t >= buffer_min) && (sector_t < buffer_max)) {
+		/* data already in track buffer */
+		if (CT(COMMAND) == FD_READ) {
+			copy_buffer(1, max_sector, buffer_max);
+			return 1;
+		}
+	} else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
+		if (CT(COMMAND) == FD_WRITE){
+			if (sector_t + CURRENT->nr_sectors > ssize &&
+			    sector_t + CURRENT->nr_sectors < ssize + ssize)
+				max_size = ssize + ssize;
+			else
+				max_size = ssize;
+		}
+		raw_cmd->flags &= ~FD_RAW_WRITE;
+		raw_cmd->flags |= FD_RAW_READ;
+		COMMAND = FM_MODE(floppy,FD_READ);
+	} else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS) {
+		unsigned long dma_limit;
+		int direct, indirect;
+
+		indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
+			sector_t;
+
+		/*
+		 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
+		 * on a 64 bit machine!
+		 */
+		max_size = buffer_chain_size();
+		dma_limit = (MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer)) >> 9;
+		if ((unsigned long) max_size > dma_limit) {
+			max_size = dma_limit;
+		}
+		/* 64 kb boundaries */
+		if (CROSS_64KB(CURRENT->buffer, max_size << 9))
+			max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
+		direct = transfer_size(ssize,max_sector,max_size) - sector_t;
+		/*
+		 * We try to read tracks, but if we get too many errors, we
+		 * go back to reading just one sector at a time.
+		 *
+		 * This means we should be able to read a sector even if there
+		 * are other bad sectors on this track.
+		 */
+		if (!direct ||
+		    (indirect * 2 > direct * 3 &&
+		     *errors < DP->max_errors.read_track &&
+		     /*!TESTF(FD_NEED_TWADDLE) &&*/
+		     ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
+			max_size = CURRENT->nr_sectors;
+		} else {
+			raw_cmd->kernel_data = CURRENT->buffer;
+			raw_cmd->length = current_count_sectors << 9;
+			if (raw_cmd->length == 0){
+				DPRINT("zero dma transfer attempted from make_raw_request\n");
+				DPRINT3("indirect=%d direct=%d sector_t=%d",
+					indirect, direct, sector_t);
+				return 0;
+			}
+			return 2;
+		}
+	}
+
+	if (CT(COMMAND) == FD_READ)
+		max_size = max_sector; /* unbounded */
+
+	/* claim buffer track if needed */
+	if (buffer_track != raw_cmd->track ||  /* bad track */
+	    buffer_drive !=current_drive || /* bad drive */
+	    sector_t > buffer_max ||
+	    sector_t < buffer_min ||
+	    ((CT(COMMAND) == FD_READ ||
+	      (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
+	     max_sector > 2 * max_buffer_sectors + buffer_min &&
+	     max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
+	    /* not enough space */){
+		buffer_track = -1;
+		buffer_drive = current_drive;
+		buffer_max = buffer_min = aligned_sector_t;
+	}
+	raw_cmd->kernel_data = floppy_track_buffer + 
+		((aligned_sector_t-buffer_min)<<9);
+
+	if (CT(COMMAND) == FD_WRITE){
+		/* copy write buffer to track buffer.
+		 * if we get here, we know that the write
+		 * is either aligned or the data already in the buffer
+		 * (buffer will be overwritten) */
+#ifdef FLOPPY_SANITY_CHECK
+		if (sector_t != aligned_sector_t && buffer_track == -1)
+			DPRINT("internal error offset !=0 on write\n");
+#endif
+		buffer_track = raw_cmd->track;
+		buffer_drive = current_drive;
+		copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
+	} else
+		transfer_size(ssize, max_sector,
+			      2*max_buffer_sectors+buffer_min-aligned_sector_t);
+
+	/* round up current_count_sectors to get dma xfer size */
+	raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
+	raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
+	raw_cmd->length <<= 9;
+#ifdef FLOPPY_SANITY_CHECK
+	if ((raw_cmd->length < current_count_sectors << 9) ||
+	    (raw_cmd->kernel_data != CURRENT->buffer &&
+	     CT(COMMAND) == FD_WRITE &&
+	     (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
+	      aligned_sector_t < buffer_min)) ||
+	    raw_cmd->length % (128 << SIZECODE) ||
+	    raw_cmd->length <= 0 || current_count_sectors <= 0){
+		DPRINT2("fractionary current count b=%lx s=%lx\n",
+			raw_cmd->length, current_count_sectors);
+		if (raw_cmd->kernel_data != CURRENT->buffer)
+			printk("addr=%d, length=%ld\n",
+			       (int) ((raw_cmd->kernel_data - 
+				       floppy_track_buffer) >> 9),
+			       current_count_sectors);
+		printk("st=%d ast=%d mse=%d msi=%d\n",
+		       sector_t, aligned_sector_t, max_sector, max_size);
+		printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
+		printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
+		       COMMAND, SECTOR, HEAD, TRACK);
+		printk("buffer drive=%d\n", buffer_drive);
+		printk("buffer track=%d\n", buffer_track);
+		printk("buffer_min=%d\n", buffer_min);
+		printk("buffer_max=%d\n", buffer_max);
+		return 0;
+	}
+
+	if (raw_cmd->kernel_data != CURRENT->buffer){
+		if (raw_cmd->kernel_data < floppy_track_buffer ||
+		    current_count_sectors < 0 ||
+		    raw_cmd->length < 0 ||
+		    raw_cmd->kernel_data + raw_cmd->length >
+		    floppy_track_buffer + (max_buffer_sectors  << 10)){
+			DPRINT("buffer overrun in schedule dma\n");
+			printk("sector_t=%d buffer_min=%d current_count=%ld\n",
+			       sector_t, buffer_min,
+			       raw_cmd->length >> 9);
+			printk("current_count_sectors=%ld\n",
+			       current_count_sectors);
+			if (CT(COMMAND) == FD_READ)
+				printk("read\n");
+			if (CT(COMMAND) == FD_READ)
+				printk("write\n");
+			return 0;
+		}
+	} else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
+		   current_count_sectors > CURRENT->nr_sectors){
+		DPRINT("buffer overrun in direct transfer\n");
+		return 0;
+	} else if (raw_cmd->length < current_count_sectors << 9){
+		DPRINT("more sectors than bytes\n");
+		printk("bytes=%ld\n", raw_cmd->length >> 9);
+		printk("sectors=%ld\n", current_count_sectors);
+	}
+	if (raw_cmd->length == 0){
+		DPRINT("zero dma transfer attempted from make_raw_request\n");
+		return 0;
+	}
+#endif
+	return 2;
+}
+
+static void redo_fd_request(void)
+{
+#define REPEAT {request_done(0); continue; }
+	kdev_t device;
+	int tmp;
+
+	lastredo = jiffies;
+	if (current_drive < N_DRIVE)
+		floppy_off(current_drive);
+
+	if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
+		DPRINT("current not active!\n");
+		return;
+	}
+
+	while(1){
+		if (!CURRENT) {
+			CLEAR_INTR;
+			unlock_fdc();
+			return;
+		}
+		if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
+			panic(DEVICE_NAME ": request list destroyed");
+		if (CURRENT->bh && !buffer_locked(CURRENT->bh))
+			panic(DEVICE_NAME ": block not locked");
+
+		device = CURRENT->rq_dev;
+		set_fdc(DRIVE(device));
+		reschedule_timeout(CURRENTD, "redo fd request", 0);
+
+		set_floppy(device);
+		raw_cmd = & default_raw_cmd;
+		raw_cmd->flags = 0;
+		if (start_motor(redo_fd_request)) return;
+		if (test_bit(current_drive, &fake_change) ||
+		   TESTF(FD_DISK_CHANGED)){
+			DPRINT("disk absent or changed during operation\n");
+			REPEAT;
+		}
+		if (!floppy) { /* Autodetection */
+			if (!probing){
+				DRS->probed_format = 0;
+				if (next_valid_format()){
+					DPRINT("no autodetectable formats\n");
+					floppy = NULL;
+					REPEAT;
+				}
+			}
+			probing = 1;
+			floppy = floppy_type+DP->autodetect[DRS->probed_format];
+		} else
+			probing = 0;
+		errors = & (CURRENT->errors);
+		tmp = make_raw_rw_request();
+		if (tmp < 2){
+			request_done(tmp);
+			continue;
+		}
+
+		if (TESTF(FD_NEED_TWADDLE))
+			twaddle();
+		floppy_tq.routine = (void *)(void *) floppy_start;
+		queue_task(&floppy_tq, &tq_timer);
+#ifdef DEBUGT
+		debugt("queue fd request");
+#endif
+		return;
+	}
+#undef REPEAT
+}
+
+static struct cont_t rw_cont={
+	rw_interrupt,
+	redo_fd_request,
+	bad_flp_intr,
+	request_done };
+
+static struct tq_struct request_tq =
+{ 0, 0, (void *) (void *) redo_fd_request, 0 };
+
+static void process_fd_request(void)
+{
+	cont = &rw_cont;
+	queue_task(&request_tq, &tq_timer);
+}
+
+static void do_fd_request(void)
+{
+	if (fdc_busy){
+		/* fdc busy, this new request will be treated when the
+		   current one is done */
+		is_alive("do fd request, old request running");
+		return;
+	}
+	lock_fdc(MAXTIMEOUT,0);
+	process_fd_request();
+	is_alive("do fd request");
+}
+
+static struct cont_t poll_cont={
+	success_and_wakeup,
+	floppy_ready,
+	generic_failure,
+	generic_done };
+
+static int poll_drive(int interruptible, int flag)
+{
+	int ret;
+	/* no auto-sense, just clear dcl */
+	raw_cmd = &default_raw_cmd;
+	raw_cmd->flags= flag;
+	raw_cmd->track=0;
+	raw_cmd->cmd_count=0;
+	cont = &poll_cont;
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG){
+		DPRINT("setting NEWCHANGE in poll_drive\n");
+	}
+#endif
+	SETF(FD_DISK_NEWCHANGE);
+	WAIT(floppy_ready);
+	return ret;
+}
+
+/*
+ * User triggered reset
+ * ====================
+ */
+
+static void reset_intr(void)
+{
+	printk("weird, reset interrupt called\n");
+}
+
+static struct cont_t reset_cont={
+	reset_intr,
+	success_and_wakeup,
+	generic_failure,
+	generic_done };
+
+static int user_reset_fdc(int drive, int arg, int interruptible)
+{
+	int ret;
+
+	ret=0;
+	LOCK_FDC(drive,interruptible);
+	if (arg == FD_RESET_ALWAYS)
+		FDCS->reset=1;
+	if (FDCS->reset){
+		cont = &reset_cont;
+		WAIT(reset_fdc);
+	}
+	process_fd_request();
+	return ret;
+}
+
+/*
+ * Misc Ioctl's and support
+ * ========================
+ */
+static int fd_copyout(void *param, const void *address, int size)
+{
+	int ret;
+
+	ECALL(verify_area(VERIFY_WRITE,param,size));
+	fd_cacheflush(address, size); /* is this necessary ??? */
+	/* Ralf: Yes; only the l2 cache is completly chipset
+	   controlled */
+	memcpy_tofs(param,(void *) address, size);
+	return 0;
+}
+
+static int fd_copyin(void *param, void *address, int size)
+{
+	int ret;
+
+	ECALL(verify_area(VERIFY_READ,param,size));
+	memcpy_fromfs((void *) address, param, size);
+	return 0;
+}
+
+#define COPYOUT(x) ECALL(fd_copyout((void *)param, &(x), sizeof(x)))
+#define COPYIN(x) ECALL(fd_copyin((void *)param, &(x), sizeof(x)))
+
+static inline const char *drive_name(int type, int drive)
+{
+	struct floppy_struct *floppy;
+
+	if (type)
+		floppy = floppy_type + type;
+	else {
+		if (UDP->native_format)
+			floppy = floppy_type + UDP->native_format;
+		else
+			return "(null)";
+	}
+	if (floppy->name)
+		return floppy->name;
+	else
+		return "(null)";
+}
+
+
+/* raw commands */
+static void raw_cmd_done(int flag)
+{
+	int i;
+
+	if (!flag) {
+		raw_cmd->flags = FD_RAW_FAILURE;
+		raw_cmd->flags |= FD_RAW_HARDFAILURE;
+	} else {
+		raw_cmd->reply_count = inr;
+		for (i=0; i< raw_cmd->reply_count; i++)
+			raw_cmd->reply[i] = reply_buffer[i];
+
+		if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE))
+			raw_cmd->length = get_dma_residue(FLOPPY_DMA);
+		
+		if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
+		    (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
+			raw_cmd->flags |= FD_RAW_FAILURE;
+
+		if (disk_change(current_drive))
+			raw_cmd->flags |= FD_RAW_DISK_CHANGE;
+		else
+			raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
+		if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
+			motor_off_callback(current_drive);
+
+		if (raw_cmd->next &&
+		   (!(raw_cmd->flags & FD_RAW_FAILURE) ||
+		    !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
+		   ((raw_cmd->flags & FD_RAW_FAILURE) ||
+		    !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
+			raw_cmd = raw_cmd->next;
+			return;
+		}
+	}
+	generic_done(flag);
+}
+
+
+static struct cont_t raw_cmd_cont={
+	success_and_wakeup,
+	floppy_start,
+	generic_failure,
+	raw_cmd_done
+};
+
+static inline int raw_cmd_copyout(int cmd, char *param,
+				  struct floppy_raw_cmd *ptr)
+{
+	struct old_floppy_raw_cmd old_raw_cmd;
+	int ret;
+
+	while(ptr) {
+		if (cmd == OLDFDRAWCMD) {
+			old_raw_cmd.flags = ptr->flags;
+			old_raw_cmd.data = ptr->data;
+			old_raw_cmd.length = ptr->length;
+			old_raw_cmd.rate = ptr->rate;
+			old_raw_cmd.reply_count = ptr->reply_count;
+			memcpy(old_raw_cmd.reply, ptr->reply, 7);
+			COPYOUT(old_raw_cmd);
+			param += sizeof(old_raw_cmd);
+		} else {
+			COPYOUT(*ptr);
+			param += sizeof(struct floppy_raw_cmd);
+		}
+
+		if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length){
+			if (ptr->length>=0 && ptr->length<=ptr->buffer_length)
+				ECALL(fd_copyout(ptr->data, 
+						 ptr->kernel_data, 
+						 ptr->buffer_length - 
+						 ptr->length));
+		}
+		ptr = ptr->next;
+	}
+	return 0;
+}
+
+
+static void raw_cmd_free(struct floppy_raw_cmd **ptr)
+{
+	struct floppy_raw_cmd *next,*this;
+
+	this = *ptr;
+	*ptr = 0;
+	while(this) {
+		if (this->buffer_length) {
+			free_pages((unsigned long)this->kernel_data,
+				   __get_order(this->buffer_length));
+			this->buffer_length = 0;
+		}
+		next = this->next;
+		kfree(this);
+		this = next;
+	}
+}
+
+
+static inline int raw_cmd_copyin(int cmd, char *param,
+				 struct floppy_raw_cmd **rcmd)
+{
+	struct floppy_raw_cmd *ptr;
+	struct old_floppy_raw_cmd old_raw_cmd;
+	int ret;
+	int i;
+	
+	*rcmd = 0;
+	while(1) {
+		ptr = (struct floppy_raw_cmd *) 
+			kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
+		if (!ptr)
+			return -ENOMEM;
+		*rcmd = ptr;
+		if (cmd == OLDFDRAWCMD){
+			COPYIN(old_raw_cmd);
+			ptr->flags = old_raw_cmd.flags;
+			ptr->data = old_raw_cmd.data;
+			ptr->length = old_raw_cmd.length;
+			ptr->rate = old_raw_cmd.rate;
+			ptr->cmd_count = old_raw_cmd.cmd_count;
+			ptr->track = old_raw_cmd.track;
+			ptr->phys_length = 0;
+			ptr->next = 0;
+			ptr->buffer_length = 0;
+			memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
+			param += sizeof(struct old_floppy_raw_cmd);
+			if (ptr->cmd_count > 9)
+				return -EINVAL;
+		} else {
+			COPYIN(*ptr);
+			ptr->next = 0;
+			ptr->buffer_length = 0;
+			param += sizeof(struct floppy_raw_cmd);
+			if (ptr->cmd_count > 16)
+				return -EINVAL;
+		}
+
+		for (i=0; i< 16; i++)
+			ptr->reply[i] = 0;
+		ptr->resultcode = 0;
+		ptr->kernel_data = 0;
+
+		if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
+			if (ptr->length <= 0)
+				return -EINVAL;
+			ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
+			if (!ptr->kernel_data)
+				return -ENOMEM;
+			ptr->buffer_length = ptr->length;
+		}
+		if ( ptr->flags & FD_RAW_READ )
+		    ECALL( verify_area( VERIFY_WRITE, ptr->data, 
+					ptr->length ));
+		if (ptr->flags & FD_RAW_WRITE)
+			ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
+					ptr->length));
+		rcmd = & (ptr->next);
+		if (!(ptr->flags & FD_RAW_MORE))
+			return 0;
+		ptr->rate &= 0x43;
+	}
+}
+
+
+static int raw_cmd_ioctl(int cmd, void *param)
+{
+	int drive, ret, ret2;
+	struct floppy_raw_cmd *my_raw_cmd;
+
+	if (FDCS->rawcmd <= 1)
+		FDCS->rawcmd = 1;
+	for (drive= 0; drive < N_DRIVE; drive++){
+		if (FDC(drive) != fdc)
+			continue;
+		if (drive == current_drive){
+			if (UDRS->fd_ref > 1){
+				FDCS->rawcmd = 2;
+				break;
+			}
+		} else if (UDRS->fd_ref){
+			FDCS->rawcmd = 2;
+			break;
+		}
+	}
+
+	if (FDCS->reset)
+		return -EIO;
+
+	ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
+	if (ret) {
+		raw_cmd_free(&my_raw_cmd);
+		return ret;
+	}
+
+	raw_cmd = my_raw_cmd;
+	cont = &raw_cmd_cont;
+	ret=wait_til_done(floppy_start,1);
+#ifdef DCL_DEBUG
+	if (DP->flags & FD_DEBUG){
+		DPRINT("calling disk change from raw_cmd ioctl\n");
+	}
+#endif
+
+	if (ret != -EINTR && FDCS->reset)
+		ret = -EIO;
+
+	DRS->track = NO_TRACK;
+
+	ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
+	if (!ret)
+		ret = ret2;
+	raw_cmd_free(&my_raw_cmd);
+	return ret;
+}
+
+static int invalidate_drive(kdev_t rdev)
+{
+	/* invalidate the buffer track to force a reread */
+	set_bit(DRIVE(rdev), &fake_change);
+	process_fd_request();
+	check_disk_change(rdev);
+	return 0;
+}
+
+
+static inline void clear_write_error(int drive)
+{
+	CLEARSTRUCT(UDRWE);
+}
+
+static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
+			       int drive, int type, kdev_t device)
+{
+	int cnt;
+
+	/* sanity checking for parameters.*/
+	if (g->sect <= 0 ||
+	    g->head <= 0 ||
+	    g->track <= 0 ||
+	    g->track > UDP->tracks>>STRETCH(g) ||
+	    /* check if reserved bits are set */
+	    (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
+		return -EINVAL;
+	if (type){
+		if (!suser())
+			return -EPERM;
+		LOCK_FDC(drive,1);
+		for (cnt = 0; cnt < N_DRIVE; cnt++){
+			if (ITYPE(drive_state[cnt].fd_device) == type &&
+			    drive_state[cnt].fd_ref)
+				set_bit(drive, &fake_change);
+		}
+		floppy_type[type] = *g;
+		floppy_type[type].name="user format";
+		for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
+			floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
+				floppy_type[type].size>>1;
+		process_fd_request();
+		for (cnt = 0; cnt < N_DRIVE; cnt++){
+			if (ITYPE(drive_state[cnt].fd_device) == type &&
+			    drive_state[cnt].fd_ref)
+				check_disk_change(
+					MKDEV(FLOPPY_MAJOR,
+					      drive_state[cnt].fd_device));
+		}
+	} else {
+		LOCK_FDC(drive,1);
+		if (cmd != FDDEFPRM)
+			/* notice a disk change immediately, else
+			 * we loose our settings immediately*/
+			CALL(poll_drive(1,0));
+		user_params[drive] = *g;
+		if (buffer_drive == drive)
+			SUPBOUND(buffer_max, user_params[drive].sect);
+		current_type[drive] = &user_params[drive];
+		floppy_sizes[drive] = user_params[drive].size >> 1;
+		if (cmd == FDDEFPRM)
+			DRS->keep_data = -1;
+		else
+			DRS->keep_data = 1;
+		/* invalidation. Invalidate only when needed, i.e.
+		 * when there are already sectors in the buffer cache
+		 * whose number will change. This is useful, because
+		 * mtools often changes the geometry of the disk after
+		 * looking at the boot block */
+		if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
+			invalidate_drive(device);
+		else
+			process_fd_request();
+	}
+	return 0;
+}
+
+/* handle obsolete ioctl's */
+static struct translation_entry {
+    int newcmd;
+    int oldcmd;
+    int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
+		  * use numeric values. NO SIZEOFS */
+} translation_table[]= {
+    {FDCLRPRM,		 0,  0},
+    {FDSETPRM,		 1, 28},
+    {FDDEFPRM,		 2, 28},
+    {FDGETPRM,		 3, 28},
+    {FDMSGON,		 4,  0},
+    {FDMSGOFF,		 5,  0},
+    {FDFMTBEG,		 6,  0},
+    {FDFMTTRK,		 7, 12},
+    {FDFMTEND,		 8,  0},
+    {FDSETEMSGTRESH,	10,  0},
+    {FDFLUSH,		11,  0},
+    {FDSETMAXERRS,	12, 20},
+    {OLDFDRAWCMD,      	30,  0},
+    {FDGETMAXERRS,	14, 20},
+    {FDGETDRVTYP,	16, 16},
+    {FDSETDRVPRM,	20, 88},
+    {FDGETDRVPRM,	21, 88},
+    {FDGETDRVSTAT,	22, 52},
+    {FDPOLLDRVSTAT,	23, 52},
+    {FDRESET,		24,  0},
+    {FDGETFDCSTAT,	25, 40},
+    {FDWERRORCLR,	27,  0},
+    {FDWERRORGET,	28, 24},
+    {FDRAWCMD,		 0,  0},
+    {FDTWADDLE,		40,  0} };
+
+static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
+{
+	int i;
+
+	for (i=0; i < ARRAY_SIZE(translation_table); i++) {
+		if ((*cmd & 0xffff) == (translation_table[i].newcmd & 0xffff)){
+			*size = _IOC_SIZE(*cmd);
+			*cmd = translation_table[i].newcmd;
+			if (*size > _IOC_SIZE(*cmd)) {
+				printk("ioctl not yet supported\n");
+				return -EFAULT;
+			}
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
+{
+	int i;
+	/* old ioctls' for kernels <= 1.3.33 */
+	/* When the next even release will come around, we'll start
+	 * warning against these.
+	 * When the next odd release will come around, we'll fail with
+	 * -EINVAL */
+	if(strcmp(system_utsname.version, "1.4.0") >= 0)
+		printk("obsolete floppy ioctl %x\n", *cmd);
+	if((system_utsname.version[0] == '1' &&
+	    strcmp(system_utsname.version, "1.5.0") >= 0) ||
+	   (system_utsname.version[0] >= '2' &&
+	    strcmp(system_utsname.version, "2.1.0") >= 0))
+		return -EINVAL;
+	for (i=0; i < ARRAY_SIZE(translation_table); i++) {
+		if (*cmd == translation_table[i].oldcmd) {
+			*size = translation_table[i].oldsize;
+			*cmd = translation_table[i].newcmd;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+		    unsigned long param)
+{
+#define IOCTL_MODE_BIT 8
+#define OPEN_WRITE_BIT 16
+#define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
+#define OUT(c,x) case c: outparam = (const char *) (x); break
+#define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
+
+	int i,drive,type;
+	kdev_t device;
+	int ret;
+	int size;
+	union inparam {
+		struct floppy_struct g; /* geometry */
+		struct format_descr f;
+		struct floppy_max_errors max_errors;
+		struct floppy_drive_params dp;
+	} inparam; /* parameters coming from user space */
+	const char *outparam; /* parameters passed back to user space */
+
+	device = inode->i_rdev;
+	switch (cmd) {
+		RO_IOCTLS(device,param);
+	}
+	type = TYPE(device);
+	drive = DRIVE(device);
+
+	/* convert the old style command into a new style command */
+	if ((cmd & 0xff00) == 0x0200) {
+		ECALL(normalize_0x02xx_ioctl(&cmd, &size));
+	} else if ((cmd & 0xff00) == 0x0000) {
+		ECALL(xlate_0x00xx_ioctl(&cmd, &size));
+	} else
+		return -EINVAL;
+
+	/* permission checks */
+	if (((cmd & 0x80) && !suser()) ||
+	     ((cmd & 0x40) && !IOCTL_ALLOWED))
+		return -EPERM;
+
+	/* verify writability of result, and fail early */
+	if (_IOC_DIR(cmd) & _IOC_READ)
+		ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
+		
+	/* copyin */
+	CLEARSTRUCT(&inparam);
+	if (_IOC_DIR(cmd) & _IOC_WRITE)
+		ECALL(fd_copyin((void *)param, &inparam, size))
+
+	switch (cmd) {
+		case FDCLRPRM:
+			LOCK_FDC(drive,1);
+			current_type[drive] = NULL;
+			floppy_sizes[drive] = MAX_DISK_SIZE;
+			UDRS->keep_data = 0;
+			return invalidate_drive(device);
+		case FDSETPRM:
+		case FDDEFPRM:
+			return set_geometry(cmd, & inparam.g,
+					    drive, type, device);
+		case FDGETPRM:
+			if (type)
+				outparam = (char *) &floppy_type[type];
+			else 
+				outparam = (char *) current_type[drive];
+			if(!outparam)
+				return -ENODEV;
+			break;
+
+		case FDMSGON:
+			UDP->flags |= FTD_MSG;
+			return 0;
+		case FDMSGOFF:
+			UDP->flags &= ~FTD_MSG;
+			return 0;
+
+		case FDFMTBEG:
+			LOCK_FDC(drive,1);
+			CALL(poll_drive(1, FD_RAW_NEED_DISK));
+			ret = UDRS->flags;
+			process_fd_request();
+			if(ret & FD_VERIFY)
+				return -ENODEV;
+			if(!(ret & FD_DISK_WRITABLE))
+				return -EROFS;
+			return 0;
+		case FDFMTTRK:
+			if (UDRS->fd_ref != 1)
+				return -EBUSY;
+			return do_format(device, &inparam.f);
+		case FDFMTEND:
+		case FDFLUSH:
+			LOCK_FDC(drive,1);
+			return invalidate_drive(device);
+
+		case FDSETEMSGTRESH:
+			UDP->max_errors.reporting =
+				(unsigned short) (param & 0x0f);
+			return 0;
+		OUT(FDGETMAXERRS, &UDP->max_errors);
+		IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
+
+		case FDGETDRVTYP:
+			outparam = drive_name(type,drive);
+			SUPBOUND(size,strlen(outparam)+1);
+			break;
+
+		IN(FDSETDRVPRM, UDP, dp);
+		OUT(FDGETDRVPRM, UDP);
+
+		case FDPOLLDRVSTAT:
+			LOCK_FDC(drive,1);
+			CALL(poll_drive(1, FD_RAW_NEED_DISK));
+			process_fd_request();
+			/* fall through */
+	       	OUT(FDGETDRVSTAT, UDRS);
+
+		case FDRESET:
+			return user_reset_fdc(drive, (int)param, 1);
+
+		OUT(FDGETFDCSTAT,UFDCS);
+
+		case FDWERRORCLR:
+			CLEARSTRUCT(UDRWE);
+			return 0;
+		OUT(FDWERRORGET,UDRWE);
+
+		case OLDFDRAWCMD:
+		case FDRAWCMD:
+			if (type)
+				return -EINVAL;
+			LOCK_FDC(drive,1);
+			set_floppy(device);
+			CALL(i = raw_cmd_ioctl(cmd,(void *) param));
+			process_fd_request();
+			return i;
+
+		case FDTWADDLE:
+			LOCK_FDC(drive,1);
+			twaddle();
+			process_fd_request();
+			return 0;
+
+		default:
+			return -EINVAL;
+	}
+
+	if (_IOC_DIR(cmd) & _IOC_READ)
+		return fd_copyout((void *)param, outparam, size);
+	else
+		return 0;
+#undef IOCTL_ALLOWED
+#undef OUT
+#undef IN
+}
+
+static void config_types(void)
+{
+	int first=1;
+	int drive;
+
+	/* read drive info out of physical cmos */
+	drive=0;
+	if (!UDP->cmos)
+		UDP->cmos= FLOPPY0_TYPE;
+	drive=1;
+	if (!UDP->cmos && FLOPPY1_TYPE)
+		UDP->cmos = FLOPPY1_TYPE;
+
+	/* XXX */
+	/* additional physical CMOS drive detection should go here */
+
+	for (drive=0; drive < N_DRIVE; drive++){
+		if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
+			memcpy((char *) UDP,
+			       (char *) (&default_drive_params[(int)UDP->cmos].params),
+			       sizeof(struct floppy_drive_params));
+		if (UDP->cmos){
+			if (first)
+				printk("Floppy drive(s): ");
+			else
+				printk(", ");
+			first=0;
+			if (UDP->cmos > 0){
+				allowed_drive_mask |= 1 << drive;
+				printk("fd%d is %s", drive,
+				       default_drive_params[(int)UDP->cmos].name);
+			} else
+				printk("fd%d is unknown type %d",drive,
+				       UDP->cmos);
+		}
+	}
+	if (!first)
+		printk("\n");
+}
+
+static int floppy_read(struct inode * inode, struct file * filp,
+		       char * buf, int count)
+{
+	int drive = DRIVE(inode->i_rdev);
+
+	check_disk_change(inode->i_rdev);
+	if (UTESTF(FD_DISK_CHANGED))
+		return -ENXIO;
+	return block_read(inode, filp, buf, count);
+}
+
+static int floppy_write(struct inode * inode, struct file * filp,
+			const char * buf, int count)
+{
+	int block;
+	int ret;
+	int drive = DRIVE(inode->i_rdev);
+
+	if (!UDRS->maxblock)
+		UDRS->maxblock=1;/* make change detectable */
+	check_disk_change(inode->i_rdev);
+	if (UTESTF(FD_DISK_CHANGED))
+		return -ENXIO;
+	if (!UTESTF(FD_DISK_WRITABLE))
+		return -EROFS;
+	block = (filp->f_pos + count) >> 9;
+	INFBOUND(UDRS->maxblock, block);
+	ret= block_write(inode, filp, buf, count);
+	return ret;
+}
+
+static void floppy_release(struct inode * inode, struct file * filp)
+{
+	int drive;
+
+	drive = DRIVE(inode->i_rdev);
+
+	if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
+		/* if the file is mounted OR (writable now AND writable at
+		 * open time) Linus: Does this cover all cases? */
+		block_fsync(inode,filp);
+
+	if (UDRS->fd_ref < 0)
+		UDRS->fd_ref=0;
+	else if (!UDRS->fd_ref--) {
+		DPRINT("floppy_release with fd_ref == 0");
+		UDRS->fd_ref = 0;
+	}
+	floppy_release_irq_and_dma();
+}
+
+/*
+ * floppy_open check for aliasing (/dev/fd0 can be the same as
+ * /dev/PS0 etc), and disallows simultaneous access to the same
+ * drive with different device numbers.
+ */
+#define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
+
+static int floppy_open(struct inode * inode, struct file * filp)
+{
+	int drive;
+	int old_dev;
+	int try;
+	char *tmp;
+
+	if (!filp) {
+		DPRINT("Weird, open called with filp=0\n");
+		return -EIO;
+	}
+
+	drive = DRIVE(inode->i_rdev);
+	if (drive >= N_DRIVE ||
+	    !(allowed_drive_mask & (1 << drive)) ||
+	    fdc_state[FDC(drive)].version == FDC_NONE)
+		return -ENXIO;
+
+	if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
+		return -ENXIO;
+	old_dev = UDRS->fd_device;
+	if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
+		return -EBUSY;
+
+	if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
+		USETF(FD_DISK_CHANGED);
+		USETF(FD_VERIFY);
+	}
+
+	if (UDRS->fd_ref == -1 ||
+	   (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
+		return -EBUSY;
+
+	if (floppy_grab_irq_and_dma())
+		return -EBUSY;
+
+	if (filp->f_flags & O_EXCL)
+		UDRS->fd_ref = -1;
+	else
+		UDRS->fd_ref++;
+
+	if (!floppy_track_buffer){
+		/* if opening an ED drive, reserve a big buffer,
+		 * else reserve a small one */
+		if ((UDP->cmos == 6) || (UDP->cmos == 5))
+			try = 64; /* Only 48 actually useful */
+		else
+			try = 32; /* Only 24 actually useful */
+
+		tmp=(char *)dma_mem_alloc(1024 * try);
+		if (!tmp) {
+			try >>= 1; /* buffer only one side */
+			INFBOUND(try, 16);
+			tmp= (char *)dma_mem_alloc(1024*try);
+		}
+		if (!tmp) {
+			DPRINT("Unable to allocate DMA memory\n");
+			RETERR(ENXIO);
+		}
+		if (floppy_track_buffer){
+			free_pages((unsigned long)tmp,__get_order(try*1024));
+		}else {
+			buffer_min = buffer_max = -1;
+			floppy_track_buffer = tmp;
+			max_buffer_sectors = try;
+		}
+	}
+
+	UDRS->fd_device = MINOR(inode->i_rdev);
+	if (old_dev != -1 && old_dev != MINOR(inode->i_rdev)) {
+		if (buffer_drive == drive)
+			buffer_track = -1;
+		invalidate_buffers(MKDEV(FLOPPY_MAJOR,old_dev));
+	}
+
+	/* Allow ioctls if we have write-permissions even if read-only open */
+	if ((filp->f_mode & 2) || (permission(inode,2) == 0))
+		filp->f_mode |= IOCTL_MODE_BIT;
+	if (filp->f_mode & 2)
+		filp->f_mode |= OPEN_WRITE_BIT;
+
+	if (UFDCS->rawcmd == 1)
+		UFDCS->rawcmd = 2;
+
+	if (filp->f_flags & O_NDELAY)
+		return 0;
+	if (filp->f_mode & 3) {
+		UDRS->last_checked = 0;
+		check_disk_change(inode->i_rdev);
+		if (UTESTF(FD_DISK_CHANGED))
+			RETERR(ENXIO);
+	}
+	if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
+		RETERR(EROFS);
+	return 0;
+#undef RETERR
+}
+
+/*
+ * Check if the disk has been changed or if a change has been faked.
+ */
+static int check_floppy_change(kdev_t dev)
+{
+	int drive = DRIVE(dev);
+
+	if (MAJOR(dev) != MAJOR_NR) {
+		DPRINT("floppy_changed: not a floppy\n");
+		return 0;
+	}
+
+	if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
+		return 1;
+
+	if (UDRS->last_checked + UDP->checkfreq < jiffies){
+		lock_fdc(drive,0);
+		poll_drive(0,0);
+		process_fd_request();
+	}
+
+	if (UTESTF(FD_DISK_CHANGED) ||
+	   UTESTF(FD_VERIFY) ||
+	   test_bit(drive, &fake_change) ||
+	   (!TYPE(dev) && !current_type[drive]))
+		return 1;
+	return 0;
+}
+
+/* revalidate the floppy disk, i.e. trigger format autodetection by reading
+ * the bootblock (block 0). "Autodetection" is also needed to check whether
+ * there is a disk in the drive at all... Thus we also do it for fixed
+ * geometry formats */
+static int floppy_revalidate(kdev_t dev)
+{
+#define NO_GEOM (!current_type[drive] && !TYPE(dev))
+	struct buffer_head * bh;
+	int drive=DRIVE(dev);
+	int cf;
+
+	if (UTESTF(FD_DISK_CHANGED) ||
+	   UTESTF(FD_VERIFY) ||
+	   test_bit(drive, &fake_change) ||
+	   NO_GEOM){
+		lock_fdc(drive,0);
+		cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
+		if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
+			process_fd_request(); /*already done by another thread*/
+			return 0;
+		}
+		UDRS->maxblock = 0;
+		UDRS->maxtrack = 0;
+		if (buffer_drive == drive)
+			buffer_track = -1;
+		clear_bit(drive, &fake_change);
+		UCLEARF(FD_DISK_CHANGED);
+		if (cf)
+			UDRS->generation++;
+		if (NO_GEOM){
+			/* auto-sensing */
+			int size = floppy_blocksizes[MINOR(dev)];
+			if (!size)
+				size = 1024;
+			if (!(bh = getblk(dev,0,size))){
+				process_fd_request();
+				return 1;
+			}
+			if (bh && !buffer_uptodate(bh))
+				ll_rw_block(READ, 1, &bh);
+			process_fd_request();
+			wait_on_buffer(bh);
+			brelse(bh);
+			return 0;
+		}
+		if (cf)
+			poll_drive(0, FD_RAW_NEED_DISK);
+		process_fd_request();
+	}
+	return 0;
+}
+
+static struct file_operations floppy_fops = {
+	NULL,			/* lseek - default */
+	floppy_read,		/* read - general block-dev read */
+	floppy_write,		/* write - general block-dev write */
+	NULL,		       	/* readdir - bad */
+	NULL,			/* select */
+	fd_ioctl,		/* ioctl */
+	NULL,			/* mmap */
+	floppy_open,		/* open */
+	floppy_release,		/* release */
+	block_fsync,		/* fsync */
+	NULL,			/* fasync */
+	check_floppy_change,	/* media_change */
+	floppy_revalidate,	/* revalidate */
+};
+
+/*
+ * Floppy Driver initialisation
+ * =============================
+ */
+
+/* Determine the floppy disk controller type */
+/* This routine was written by David C. Niemi */
+static char get_fdc_version(void)
+{
+	int r;
+
+	output_byte(FD_DUMPREGS);	/* 82072 and better know DUMPREGS */
+	if (FDCS->reset)
+		return FDC_NONE;
+	if ((r = result()) <= 0x00)
+		return FDC_NONE;	/* No FDC present ??? */
+	if ((r==1) && (reply_buffer[0] == 0x80)){
+		printk("FDC %d is a 8272A\n",fdc);
+		return FDC_8272A;	/* 8272a/765 don't know DUMPREGS */
+	}
+	if (r != 10) {
+		printk("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
+		       fdc, r);
+		return FDC_UNKNOWN;
+	}
+	output_byte(FD_VERSION);
+	r = result();
+	if ((r == 1) && (reply_buffer[0] == 0x80)){
+		printk("FDC %d is a 82072\n",fdc);
+		return FDC_82072;		/* 82072 doesn't know VERSION */
+	}
+	if ((r != 1) || (reply_buffer[0] != 0x90)) {
+		printk("FDC %d init: VERSION: unexpected return of %d bytes.\n",
+		       fdc, r);
+		return FDC_UNKNOWN;
+	}
+	output_byte(FD_UNLOCK);
+	r = result();
+	if ((r == 1) && (reply_buffer[0] == 0x80)){
+		printk("FDC %d is a pre-1991 82077\n", fdc);
+		return FDC_82077_ORIG;	/* Pre-1991 82077 doesn't know LOCK/UNLOCK */
+	}
+	if ((r != 1) || (reply_buffer[0] != 0x00)) {
+		printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
+		       fdc, r);
+		return FDC_UNKNOWN;
+	}
+	output_byte(FD_PARTID);
+	r = result();
+	if (r != 1) {
+		printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
+		       fdc, r);
+		return FDC_UNKNOWN;
+	}
+	if (reply_buffer[0] == 0x80) {
+		printk("FDC %d is a post-1991 82077\n",fdc);
+		return FDC_82077;	/* Revised 82077AA passes all the tests */
+	}
+	switch (reply_buffer[0] >> 5) {
+		case 0x0:
+			output_byte(FD_SAVE);
+			r = result();
+			if (r != 16) {
+				printk("FDC %d init: SAVE: unexpected return of %d bytes.\n", fdc, r);
+				return FDC_UNKNOWN;
+			}
+			if (!(reply_buffer[0] & 0x40)) {
+				printk("FDC %d is a 3Volt 82078SL.\n",fdc);
+				return FDC_82078;
+			}
+			/* Either a 82078-1 or a 82078SL running at 5Volt */
+			printk("FDC %d is a 82078-1.\n",fdc);
+			return FDC_82078_1;
+		case 0x1:
+			printk("FDC %d is a 44pin 82078\n",fdc);
+			return FDC_82078;
+		case 0x2:
+			printk("FDC %d is a S82078B\n", fdc);
+			return FDC_S82078B;
+		case 0x3:
+			printk("FDC %d is a National Semiconductor PC87306\n", fdc);
+			return FDC_87306;
+		default:
+			printk("FDC %d init: 82077 variant with PARTID=%d.\n",
+			       fdc, reply_buffer[0] >> 5);
+			return FDC_82077_UNKN;
+	}
+} /* get_fdc_version */
+
+/* lilo configuration */
+
+/* we make the invert_dcl function global. One day, somebody might
+ * want to centralize all thinkpad related options into one lilo option,
+ * there are just so many thinkpad related quirks! */
+void floppy_invert_dcl(int *ints,int param)
+{
+	int i;
+
+	for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
+		if (param)
+			default_drive_params[i].params.flags |= 0x80;
+		else
+			default_drive_params[i].params.flags &= ~0x80;
+	}
+	DPRINT("Configuring drives for inverted dcl\n");
+}
+
+static void daring(int *ints,int param)
+{
+	int i;
+
+	for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
+		if (param){
+			default_drive_params[i].params.select_delay = 0;
+			default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
+		} else {
+			default_drive_params[i].params.select_delay = 2*HZ/100;
+			default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
+		}
+	}
+	DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
+}
+
+static void allow_drives(int *ints, int param)
+{
+	allowed_drive_mask=param;
+	DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
+}
+
+static void fdc2_adr(int *ints, int param)
+{
+	FDC2 = param;
+	if (param)
+		DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
+	else
+		DPRINT("disabling second fdc\n");
+}
+
+static void unex(int *ints,int param)
+{
+	print_unex = param;
+	DPRINT1("%sprinting messages for unexpected interrupts\n",
+		param ? "" : "not ");
+}
+
+static void set_cmos(int *ints, int dummy)
+{
+	int current_drive=0;
+
+	if (ints[0] != 2){
+		DPRINT("wrong number of parameter for cmos\n");
+		return;
+	}
+	current_drive = ints[1];
+	if (current_drive < 0 || current_drive >= 8){
+		DPRINT("bad drive for set_cmos\n");
+		return;
+	}
+	if (current_drive >= 4 && !FDC2)
+		fdc2_adr(0, 0x370);
+	if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
+		DPRINT1("bad cmos code %d\n", ints[2]);
+		return;
+	}
+	DP->cmos = ints[2];
+	DPRINT1("setting cmos code to %d\n", ints[2]);
+}
+
+static struct param_table {
+	const char *name;
+	void (*fn)(int *ints, int param);
+	int def_param;
+} config_params[]={
+	{ "allowed_drive_mask", allow_drives, 0xff },
+	{ "all_drives", allow_drives, 0xff },
+	{ "asus_pci", allow_drives, 0x33 },
+
+	{ "daring", daring, 1},
+
+	{ "two_fdc", fdc2_adr, 0x370 },
+	{ "one_fdc", fdc2_adr, 0 },
+
+	{ "thinkpad", floppy_invert_dcl, 1 },
+
+	{ "cmos", set_cmos, 0 },
+
+	{ "unexpected_interrupts", unex, 1 },
+	{ "no_unexpected_interrupts", unex, 0 },
+	{ "L40SX", unex, 0 } };
+
+#define FLOPPY_SETUP
+void floppy_setup(char *str, int *ints)
+{
+	int i;
+	int param;
+	if (str)
+		for (i=0; i< ARRAY_SIZE(config_params); i++){
+			if (strcmp(str,config_params[i].name) == 0){
+				if (ints[0])
+					param = ints[1];
+				else
+					param = config_params[i].def_param;
+				config_params[i].fn(ints,param);
+				return;
+			}
+		}
+	if (str) {
+		DPRINT1("unknown floppy option [%s]\n", str);
+		
+		DPRINT("allowed options are:");
+		for (i=0; i< ARRAY_SIZE(config_params); i++)
+			printk(" %s",config_params[i].name);
+		printk("\n");
+	} else
+		DPRINT("botched floppy option\n");
+	DPRINT("Read linux/drivers/block/README.fd\n");
+}
+
+int floppy_init(void)
+{
+	int i,unit,drive;
+	int have_no_fdc= -EIO;
+
+	raw_cmd = 0;
+
+	sti();
+
+	if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
+		printk("Unable to get major %d for floppy\n",MAJOR_NR);
+		return -EBUSY;
+	}
+
+	for (i=0; i<256; i++)
+		if (ITYPE(i))
+			floppy_sizes[i] = floppy_type[ITYPE(i)].size >> 1;
+		else
+			floppy_sizes[i] = MAX_DISK_SIZE;
+
+	blk_size[MAJOR_NR] = floppy_sizes;
+	blksize_size[MAJOR_NR] = floppy_blocksizes;
+	blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
+	reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
+	config_types();
+
+	for (i = 0; i < N_FDC; i++) {
+		fdc = i;
+		CLEARSTRUCT(FDCS);
+		FDCS->dtr = -1;
+		FDCS->dor = 0x4;
+	}
+
+	fdc_state[0].address = FDC1;
+#if N_FDC > 1
+	fdc_state[1].address = FDC2;
+#endif
+
+	if (floppy_grab_irq_and_dma()){
+		unregister_blkdev(MAJOR_NR,"fd");
+		return -EBUSY;
+	}
+
+	/* initialise drive state */
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		CLEARSTRUCT(UDRS);
+		CLEARSTRUCT(UDRWE);
+		UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
+		UDRS->fd_device = -1;
+		floppy_track_buffer = NULL;
+		max_buffer_sectors = 0;
+	}
+
+	for (i = 0; i < N_FDC; i++) {
+		fdc = i;
+		FDCS->driver_version = FD_DRIVER_VERSION;
+		for (unit=0; unit<4; unit++)
+			FDCS->track[unit] = 0;
+		if (FDCS->address == -1)
+			continue;
+		FDCS->rawcmd = 2;
+		if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
+			FDCS->address = -1;
+			continue;
+		}
+		/* Try to determine the floppy controller type */
+		FDCS->version = get_fdc_version();
+		if (FDCS->version == FDC_NONE){
+			FDCS->address = -1;
+			continue;
+		}
+
+		request_region(FDCS->address, 6, "floppy");
+		request_region(FDCS->address+7, 1, "floppy DIR");
+		/* address + 6 is reserved, and may be taken by IDE.
+		 * Unfortunately, Adaptec doesn't know this :-(, */
+
+		have_no_fdc = 0;
+		/* Not all FDCs seem to be able to handle the version command
+		 * properly, so force a reset for the standard FDC clones,
+		 * to avoid interrupt garbage.
+		 */
+		FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
+		user_reset_fdc(-1,FD_RESET_ALWAYS,0);
+	}
+	fdc=0;
+	del_timer(&fd_timeout);
+	current_drive = 0;
+	floppy_release_irq_and_dma();
+	initialising=0;
+	if (have_no_fdc) {
+		DPRINT("no floppy controllers found\n");
+		unregister_blkdev(MAJOR_NR,"fd");
+	} else
+		virtual_dma_init();
+	return have_no_fdc;
+}
+
+static int floppy_grab_irq_and_dma(void)
+{
+	int i;
+	cli();
+	if (usage_count++){
+		sti();
+		return 0;
+	}
+	sti();
+	MOD_INC_USE_COUNT;
+	for (i=0; i< N_FDC; i++){
+		if (FDCS->address != -1){
+			fdc = i;
+			reset_fdc_info(1);
+			fd_outb(FDCS->dor, FD_DOR);
+		}
+	}
+	set_dor(0, ~0, 8);  /* avoid immediate interrupt */
+
+	if (fd_request_irq()) {
+		DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
+			FLOPPY_IRQ);
+		return -1;
+	}
+	if (fd_request_dma()) {
+		DPRINT1("Unable to grab DMA%d for the floppy driver\n",
+			FLOPPY_DMA);
+		fd_free_irq();
+		return -1;
+	}
+	for (fdc = 0; fdc < N_FDC; fdc++)
+		if (FDCS->address != -1)
+			fd_outb(FDCS->dor, FD_DOR);
+	fdc = 0;
+	fd_enable_irq();
+	return 0;
+}
+
+static void floppy_release_irq_and_dma(void)
+{
+#ifdef FLOPPY_SANITY_CHECK
+	int drive;
+#endif
+	long tmpsize;
+	void *tmpaddr;
+
+	cli();
+	if (--usage_count){
+		sti();
+		return;
+	}
+	sti();
+	MOD_DEC_USE_COUNT;
+	fd_disable_dma();
+	fd_free_dma();
+	fd_disable_irq();
+	fd_free_irq();
+
+	set_dor(0, ~0, 8);
+#if N_FDC > 1
+	set_dor(1, ~8, 0);
+#endif
+	floppy_enable_hlt();
+
+	if (floppy_track_buffer && max_buffer_sectors) {
+		tmpsize = max_buffer_sectors*1024;
+		tmpaddr = (void *)floppy_track_buffer;
+		floppy_track_buffer = 0;
+		max_buffer_sectors = 0;
+		buffer_min = buffer_max = -1;
+		free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
+	}
+
+#ifdef FLOPPY_SANITY_CHECK
+	for (drive=0; drive < N_FDC * 4; drive++)
+		if (motor_off_timer[drive].next)
+			printk("motor off timer %d still active\n", drive);
+
+	if (fd_timeout.next)
+		printk("floppy timer still active:%s\n", timeout_message);
+	if (fd_timer.next)
+		printk("auxiliary floppy timer still active\n");
+	if (floppy_tq.sync)
+		printk("task queue still active\n");
+#endif
+}
+
+
+#ifdef MODULE
+
+extern char *get_options(char *str, int *ints);
+
+static void mod_setup(char *pattern, void (*setup)(char *, int *))
+{
+	int i;
+	char c;
+	int j;
+	int match;
+	char buffer[100];
+	int ints[11];
+	int length = strlen(pattern)+1;
+
+	match=0;
+	j=1;
+
+	for (i=current->mm->env_start; i< current->mm->env_end; i ++){
+		c= get_fs_byte(i);
+		if (match){
+			if (j==99)
+				c='\0';
+			buffer[j] = c;
+			if (!c || c == ' ' || c == '\t'){
+				if (j){
+					buffer[j] = '\0';
+					setup(get_options(buffer,ints),ints);
+				}
+				j=0;
+			} else
+				j++;
+			if (!c)
+				break;
+			continue;
+		}
+		if ((!j && !c) || (j && c == pattern[j-1]))
+			j++;
+		else
+			j=0;
+		if (j==length){
+			match=1;
+			j=0;
+		}
+	}
+}
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+int init_module(void)
+{
+	printk("inserting floppy driver for %s\n", kernel_version);
+		
+	mod_setup("floppy=", floppy_setup);
+		
+	return floppy_init();
+}
+
+void cleanup_module(void)
+{
+	int fdc;
+		
+	for (fdc=0; fdc<2; fdc++)
+		if (FDCS->address != -1){
+			release_region(FDCS->address, 6);
+			release_region(FDCS->address+7, 1);
+	}
+		
+	unregister_blkdev(MAJOR_NR, "fd");
+
+	blk_dev[MAJOR_NR].request_fn = 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/i386/i386at/gpl/linux/block/genhd.c b/i386/i386at/gpl/linux/block/genhd.c
new file mode 100644
index 0000000..60cba6c
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/genhd.c
@@ -0,0 +1,610 @@
+/*
+ *  Code extracted from
+ *  linux/kernel/hd.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *
+ *  Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ *  in the early extended-partition checks and added DM partitions
+ *
+ *  Support for DiskManager v6.0x added by Mark Lord (mlord@bnr.ca)
+ *  with information provided by OnTrack.  This now works for linux fdisk
+ *  and LILO, as well as loadlin and bootln.  Note that disks other than
+ *  /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1).
+ *
+ *  More flexible handling of extended partitions - aeb, 950831
+ *
+ *  Check partition table on IDE disks for common CHS translations
+ */
+
+#include <linux/config.h>
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/string.h>
+
+#include <asm/system.h>
+
+#ifdef __alpha__
+/*
+ * On the Alpha, we get unaligned access exceptions on
+ *  p->nr_sects and p->start_sect, when the partition table
+ *  is not on a 4-byte boundary, which is frequently the case.
+ * This code uses unaligned load instructions to prevent
+ *  such exceptions.
+ */
+#include <asm/unaligned.h>
+#define NR_SECTS(p)	ldl_u(&p->nr_sects)
+#define START_SECT(p)	ldl_u(&p->start_sect)
+#else /* __alpha__ */
+#define NR_SECTS(p)	p->nr_sects
+#define START_SECT(p)	p->start_sect
+#endif /* __alpha__ */
+
+#ifdef MACH
+#include <i386/ipl.h>
+#endif
+
+struct gendisk *gendisk_head = NULL;
+
+static int current_minor = 0;
+extern int *blk_size[];
+extern void rd_load(void);
+
+extern int chr_dev_init(void);
+extern int blk_dev_init(void);
+extern int scsi_dev_init(void);
+extern int net_dev_init(void);
+
+static void print_minor_name (struct gendisk *hd, int minor)
+{
+	unsigned int unit = minor >> hd->minor_shift;
+	unsigned int part = minor & ((1 << hd->minor_shift) - 1);
+
+#ifdef CONFIG_BLK_DEV_IDE
+	/*
+	 * IDE devices use multiple major numbers, but the drives
+	 * are named as:  {hda,hdb}, {hdc,hdd}, {hde,hdf}, {hdg,hdh}..
+	 * This requires some creative handling here to find the
+	 * correct name to use, with some help from ide.c
+	 */
+	if (!strcmp(hd->major_name,"ide")) {
+		char name[16];		/* more than large enough */
+		strcpy(name, hd->real_devices); /* courtesy ide.c */
+		name[strlen(name)-1] += unit;
+		printk(" %s", name);
+	} else
+#endif
+		printk(" %s%c", hd->major_name, 'a' + unit);
+	if (part)
+		printk("%d", part);
+	else
+		printk(":");
+}
+
+static void add_partition (struct gendisk *hd, int minor, int start, int size)
+{
+	hd->part[minor].start_sect = start;
+	hd->part[minor].nr_sects   = size;
+	print_minor_name(hd, minor);
+}
+
+static inline int is_extended_partition(struct partition *p)
+{
+	return (p->sys_ind == DOS_EXTENDED_PARTITION ||
+		p->sys_ind == LINUX_EXTENDED_PARTITION);
+}
+
+#ifdef CONFIG_MSDOS_PARTITION
+/*
+ * Create devices for each logical partition in an extended partition.
+ * The logical partitions form a linked list, with each entry being
+ * a partition table with two entries.  The first entry
+ * is the real data partition (with a start relative to the partition
+ * table start).  The second is a pointer to the next logical partition
+ * (with a start relative to the entire extended partition).
+ * We do not create a Linux partition for the partition tables, but
+ * only for the actual data partitions.
+ */
+
+static void extended_partition(struct gendisk *hd, kdev_t dev)
+{
+	struct buffer_head *bh;
+	struct partition *p;
+	unsigned long first_sector, first_size, this_sector, this_size;
+	int mask = (1 << hd->minor_shift) - 1;
+	int i;
+
+	first_sector = hd->part[MINOR(dev)].start_sect;
+	first_size = hd->part[MINOR(dev)].nr_sects;
+	this_sector = first_sector;
+
+	while (1) {
+		if ((current_minor & mask) == 0)
+			return;
+		if (!(bh = bread(dev,0,1024)))
+			return;
+	  /*
+	   * This block is from a device that we're about to stomp on.
+	   * So make sure nobody thinks this block is usable.
+	   */
+		bh->b_state = 0;
+
+		if (*(unsigned short *) (bh->b_data+510) != 0xAA55)
+			goto done;
+
+		p = (struct partition *) (0x1BE + bh->b_data);
+
+		this_size = hd->part[MINOR(dev)].nr_sects;
+
+		/*
+		 * Usually, the first entry is the real data partition,
+		 * the 2nd entry is the next extended partition, or empty,
+		 * and the 3rd and 4th entries are unused.
+		 * However, DRDOS sometimes has the extended partition as
+		 * the first entry (when the data partition is empty),
+		 * and OS/2 seems to use all four entries.
+		 */
+
+		/* 
+		 * First process the data partition(s)
+		 */
+		for (i=0; i<4; i++, p++) {
+		    if (!NR_SECTS(p) || is_extended_partition(p))
+		      continue;
+
+		    /* Check the 3rd and 4th entries -
+		       these sometimes contain random garbage */
+		    if (i >= 2
+			&& START_SECT(p) + NR_SECTS(p) > this_size
+			&& (this_sector + START_SECT(p) < first_sector ||
+			    this_sector + START_SECT(p) + NR_SECTS(p) >
+			     first_sector + first_size))
+		      continue;
+
+		    add_partition(hd, current_minor, this_sector+START_SECT(p), NR_SECTS(p));
+		    current_minor++;
+		    if ((current_minor & mask) == 0)
+		      goto done;
+		}
+		/*
+		 * Next, process the (first) extended partition, if present.
+		 * (So far, there seems to be no reason to make
+		 *  extended_partition()  recursive and allow a tree
+		 *  of extended partitions.)
+		 * It should be a link to the next logical partition.
+		 * Create a minor for this just long enough to get the next
+		 * partition table.  The minor will be reused for the next
+		 * data partition.
+		 */
+		p -= 4;
+		for (i=0; i<4; i++, p++)
+		  if(NR_SECTS(p) && is_extended_partition(p))
+		    break;
+		if (i == 4)
+		  goto done;	 /* nothing left to do */
+
+		hd->part[current_minor].nr_sects = NR_SECTS(p);
+		hd->part[current_minor].start_sect = first_sector + START_SECT(p);
+		this_sector = first_sector + START_SECT(p);
+		dev = MKDEV(hd->major, current_minor);
+		brelse(bh);
+	}
+done:
+	brelse(bh);
+}
+
+static int msdos_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector)
+{
+	int i, minor = current_minor;
+	struct buffer_head *bh;
+	struct partition *p;
+	unsigned char *data;
+	int mask = (1 << hd->minor_shift) - 1;
+#ifdef CONFIG_BLK_DEV_IDE
+	int tested_for_xlate = 0;
+
+read_mbr:
+#endif
+	if (!(bh = bread(dev,0,1024))) {
+		printk(" unable to read partition table\n");
+		return -1;
+	}
+	data = bh->b_data;
+	/* In some cases we modify the geometry    */
+	/*  of the drive (below), so ensure that   */
+	/*  nobody else tries to re-use this data. */
+	bh->b_state = 0;
+#ifdef CONFIG_BLK_DEV_IDE
+check_table:
+#endif
+	if (*(unsigned short *)  (0x1fe + data) != 0xAA55) {
+		brelse(bh);
+		return 0;
+	}
+	p = (struct partition *) (0x1be + data);
+
+#ifdef CONFIG_BLK_DEV_IDE
+	if (!tested_for_xlate++) {	/* Do this only once per disk */
+		/*
+		 * Look for various forms of IDE disk geometry translation
+		 */
+		extern int ide_xlate_1024(kdev_t, int, const char *);
+		unsigned int sig = *(unsigned short *)(data + 2);
+		if (p->sys_ind == EZD_PARTITION) {
+			/*
+			 * The remainder of the disk must be accessed using
+			 * a translated geometry that reduces the number of 
+			 * apparent cylinders to less than 1024 if possible.
+			 *
+			 * ide_xlate_1024() will take care of the necessary
+			 * adjustments to fool fdisk/LILO and partition check.
+			 */
+			if (ide_xlate_1024(dev, -1, " [EZD]")) {
+				data += 512;
+				goto check_table;
+			}
+		} else if (p->sys_ind == DM6_PARTITION) {
+
+			/*
+			 * Everything on the disk is offset by 63 sectors,
+			 * including a "new" MBR with its own partition table,
+			 * and the remainder of the disk must be accessed using
+			 * a translated geometry that reduces the number of 
+			 * apparent cylinders to less than 1024 if possible.
+			 *
+			 * ide_xlate_1024() will take care of the necessary
+			 * adjustments to fool fdisk/LILO and partition check.
+			 */
+			if (ide_xlate_1024(dev, 1, " [DM6:DDO]")) {
+				brelse(bh);
+				goto read_mbr;	/* start over with new MBR */
+			}
+		} else if (sig <= 0x1ae && *(unsigned short *)(data + sig) == 0x55AA
+			 && (1 & *(unsigned char *)(data + sig + 2)) ) 
+		{
+			/*
+			 * DM6 signature in MBR, courtesy of OnTrack
+			 */
+			(void) ide_xlate_1024 (dev, 0, " [DM6:MBR]");
+		} else if (p->sys_ind == DM6_AUX1PARTITION || p->sys_ind == DM6_AUX3PARTITION) {
+			/*
+			 * DM6 on other than the first (boot) drive
+			 */
+			(void) ide_xlate_1024(dev, 0, " [DM6:AUX]");
+		} else {
+			/*
+			 * Examine the partition table for common translations.
+			 * This is necessary for drives for situations where
+			 * the translated geometry is unavailable from the BIOS.
+			 */
+			for (i = 0; i < 4 ; i++) {
+				struct partition *q = &p[i];
+				if (NR_SECTS(q) && q->sector == 1 && q->end_sector == 63) {
+					unsigned int heads = q->end_head + 1;
+					if (heads == 32 || heads == 64 || heads == 128) {
+
+						(void) ide_xlate_1024(dev, heads, " [PTBL]");
+						break;
+					}
+				}
+			}
+		}
+	}
+#endif	/* CONFIG_BLK_DEV_IDE */
+
+	current_minor += 4;  /* first "extra" minor (for extended partitions) */
+	for (i=1 ; i<=4 ; minor++,i++,p++) {
+		if (!NR_SECTS(p))
+			continue;
+		add_partition(hd, minor, first_sector+START_SECT(p), NR_SECTS(p));
+		if (is_extended_partition(p)) {
+			printk(" <");
+			/*
+			 * If we are rereading the partition table, we need
+			 * to set the size of the partition so that we will
+			 * be able to bread the block containing the extended
+			 * partition info.
+			 */
+			hd->sizes[minor] = hd->part[minor].nr_sects 
+			  	>> (BLOCK_SIZE_BITS - 9);
+			extended_partition(hd, MKDEV(hd->major, minor));
+			printk(" >");
+			/* prevent someone doing mkfs or mkswap on an
+			   extended partition, but leave room for LILO */
+			if (hd->part[minor].nr_sects > 2)
+				hd->part[minor].nr_sects = 2;
+		}
+	}
+	/*
+	 *  Check for old-style Disk Manager partition table
+	 */
+	if (*(unsigned short *) (data+0xfc) == 0x55AA) {
+		p = (struct partition *) (0x1be + data);
+		for (i = 4 ; i < 16 ; i++, current_minor++) {
+			p--;
+			if ((current_minor & mask) == 0)
+				break;
+			if (!(START_SECT(p) && NR_SECTS(p)))
+				continue;
+			add_partition(hd, current_minor, START_SECT(p), NR_SECTS(p));
+		}
+	}
+	printk("\n");
+	brelse(bh);
+	return 1;
+}
+
+#endif /* CONFIG_MSDOS_PARTITION */
+
+#ifdef CONFIG_OSF_PARTITION
+
+static int osf_partition(struct gendisk *hd, unsigned int dev, unsigned long first_sector)
+{
+	int i;
+	int mask = (1 << hd->minor_shift) - 1;
+	struct buffer_head *bh;
+	struct disklabel {
+		u32 d_magic;
+		u16 d_type,d_subtype;
+		u8 d_typename[16];
+		u8 d_packname[16];
+		u32 d_secsize;
+		u32 d_nsectors;
+		u32 d_ntracks;
+		u32 d_ncylinders;
+		u32 d_secpercyl;
+		u32 d_secprtunit;
+		u16 d_sparespertrack;
+		u16 d_sparespercyl;
+		u32 d_acylinders;
+		u16 d_rpm, d_interleave, d_trackskew, d_cylskew;
+		u32 d_headswitch, d_trkseek, d_flags;
+		u32 d_drivedata[5];
+		u32 d_spare[5];
+		u32 d_magic2;
+		u16 d_checksum;
+		u16 d_npartitions;
+		u32 d_bbsize, d_sbsize;
+		struct d_partition {
+			u32 p_size;
+			u32 p_offset;
+			u32 p_fsize;
+			u8  p_fstype;
+			u8  p_frag;
+			u16 p_cpg;
+		} d_partitions[8];
+	} * label;
+	struct d_partition * partition;
+#define DISKLABELMAGIC (0x82564557UL)
+
+	if (!(bh = bread(dev,0,1024))) {
+		printk("unable to read partition table\n");
+		return -1;
+	}
+	label = (struct disklabel *) (bh->b_data+64);
+	partition = label->d_partitions;
+	if (label->d_magic != DISKLABELMAGIC) {
+		printk("magic: %08x\n", label->d_magic);
+		brelse(bh);
+		return 0;
+	}
+	if (label->d_magic2 != DISKLABELMAGIC) {
+		printk("magic2: %08x\n", label->d_magic2);
+		brelse(bh);
+		return 0;
+	}
+	for (i = 0 ; i < label->d_npartitions; i++, partition++) {
+		if ((current_minor & mask) == 0)
+		        break;
+		if (partition->p_size)
+			add_partition(hd, current_minor,
+				first_sector+partition->p_offset,
+				partition->p_size);
+		current_minor++;
+	}
+	printk("\n");
+	brelse(bh);
+	return 1;
+}
+
+#endif /* CONFIG_OSF_PARTITION */
+
+#ifdef CONFIG_SUN_PARTITION
+
+static int sun_partition(struct gendisk *hd, unsigned int dev, unsigned long first_sector)
+{
+	int i, csum;
+	unsigned short *ush;
+	struct buffer_head *bh;
+	struct sun_disklabel {
+		unsigned char info[128];   /* Informative text string */
+		unsigned char spare[292];  /* Boot information etc. */
+		unsigned short rspeed;     /* Disk rotational speed */
+		unsigned short pcylcount;  /* Physical cylinder count */
+		unsigned short sparecyl;   /* extra sects per cylinder */
+		unsigned char spare2[4];   /* More magic... */
+		unsigned short ilfact;     /* Interleave factor */
+		unsigned short ncyl;       /* Data cylinder count */
+		unsigned short nacyl;      /* Alt. cylinder count */
+		unsigned short ntrks;      /* Tracks per cylinder */
+		unsigned short nsect;      /* Sectors per track */
+		unsigned char spare3[4];   /* Even more magic... */
+		struct sun_partition {
+			unsigned long start_cylinder;
+			unsigned long num_sectors;
+		} partitions[8];
+		unsigned short magic;      /* Magic number */
+		unsigned short csum;       /* Label xor'd checksum */
+	} * label;		
+	struct sun_partition *p;
+	unsigned long spc;
+#define SUN_LABEL_MAGIC  0xDABE
+
+	if(!(bh = bread(dev, 0, 1024))) {
+		printk("Dev %d: unable to read partition table\n", dev);
+		return -1;
+	}
+	label = (struct sun_disklabel *) bh->b_data;
+	p = label->partitions;
+	if(label->magic != SUN_LABEL_MAGIC) {
+		printk("Dev %d Sun disklabel: bad magic %08x\n", dev, label->magic);
+		brelse(bh);
+		return 0;
+	}
+	/* Look at the checksum */
+	ush = ((unsigned short *) (label+1)) - 1;
+	for(csum = 0; ush >= ((unsigned short *) label);)
+		csum ^= *ush--;
+	if(csum) {
+		printk("Dev %d Sun disklabel: Csum bad, label corrupted\n", dev);
+		brelse(bh);
+		return 0;
+	}
+	/* All Sun disks have 8 partition entries */
+	spc = (label->ntrks * label->nsect);
+	for(i=0; i < 8; i++, p++) {
+		unsigned long st_sector;
+
+		/* We register all partitions, even if zero size, so that
+		 * the minor numbers end up ok as per SunOS interpretation.
+		 */
+		st_sector = first_sector + (p->start_cylinder * spc);
+		add_partition(hd, current_minor, st_sector, p->num_sectors);
+		current_minor++;
+	}
+	printk("\n");
+	brelse(bh);
+	return 1;
+}
+
+#endif /* CONFIG_SUN_PARTITION */
+
+static void check_partition(struct gendisk *hd, kdev_t dev)
+{
+	static int first_time = 1;
+	unsigned long first_sector;
+
+	if (first_time)
+		printk("Partition check:\n");
+	first_time = 0;
+	first_sector = hd->part[MINOR(dev)].start_sect;
+
+	/*
+	 * This is a kludge to allow the partition check to be
+	 * skipped for specific drives (e.g. IDE cd-rom drives)
+	 */
+	if ((int)first_sector == -1) {
+		hd->part[MINOR(dev)].start_sect = 0;
+		return;
+	}
+
+	printk(" ");
+	print_minor_name(hd, MINOR(dev));
+#ifdef CONFIG_MSDOS_PARTITION
+	if (msdos_partition(hd, dev, first_sector))
+		return;
+#endif
+#ifdef CONFIG_OSF_PARTITION
+	if (osf_partition(hd, dev, first_sector))
+		return;
+#endif
+#ifdef CONFIG_SUN_PARTITION
+	if(sun_partition(hd, dev, first_sector))
+		return;
+#endif
+	printk(" unknown partition table\n");
+}
+
+/* This function is used to re-read partition tables for removable disks.
+   Much of the cleanup from the old partition tables should have already been
+   done */
+
+/* This function will re-read the partition tables for a given device,
+and set things back up again.  There are some important caveats,
+however.  You must ensure that no one is using the device, and no one
+can start using the device while this function is being executed. */
+
+void resetup_one_dev(struct gendisk *dev, int drive)
+{
+	int i;
+	int first_minor	= drive << dev->minor_shift;
+	int end_minor	= first_minor + dev->max_p;
+
+	blk_size[dev->major] = NULL;
+	current_minor = 1 + first_minor;
+	check_partition(dev, MKDEV(dev->major, first_minor));
+
+ 	/*
+ 	 * We need to set the sizes array before we will be able to access
+ 	 * any of the partitions on this device.
+ 	 */
+	if (dev->sizes != NULL) {	/* optional safeguard in ll_rw_blk.c */
+		for (i = first_minor; i < end_minor; i++)
+			dev->sizes[i] = dev->part[i].nr_sects >> (BLOCK_SIZE_BITS - 9);
+		blk_size[dev->major] = dev->sizes;
+	}
+}
+
+static void setup_dev(struct gendisk *dev)
+{
+	int i, drive;
+	int end_minor	= dev->max_nr * dev->max_p;
+
+	blk_size[dev->major] = NULL;
+	for (i = 0 ; i < end_minor; i++) {
+		dev->part[i].start_sect = 0;
+		dev->part[i].nr_sects = 0;
+	}
+	dev->init(dev);	
+	for (drive = 0 ; drive < dev->nr_real ; drive++) {
+		int first_minor	= drive << dev->minor_shift;
+		current_minor = 1 + first_minor;
+		check_partition(dev, MKDEV(dev->major, first_minor));
+	}
+	if (dev->sizes != NULL) {	/* optional safeguard in ll_rw_blk.c */
+		for (i = 0; i < end_minor; i++)
+			dev->sizes[i] = dev->part[i].nr_sects >> (BLOCK_SIZE_BITS - 9);
+		blk_size[dev->major] = dev->sizes;
+	}
+}
+
+void device_setup(void)
+{
+	extern void console_map_init(void);
+	struct gendisk *p;
+	int nr=0;
+#ifdef MACH
+	extern int linux_intr_pri;
+
+	linux_intr_pri = SPL5;
+#endif
+
+#ifndef MACH
+	chr_dev_init();
+#endif
+	blk_dev_init();
+	sti();
+#ifdef CONFIG_SCSI
+	scsi_dev_init();
+#endif
+#ifdef CONFIG_INET
+#ifdef MACH
+	linux_intr_pri = SPL6;
+#endif
+	net_dev_init();
+#endif
+#ifndef MACH
+	console_map_init();
+#endif
+
+	for (p = gendisk_head ; p ; p=p->next) {
+		setup_dev(p);
+		nr += p->nr_real;
+	}
+#ifdef CONFIG_BLK_DEV_RAM
+	rd_load();
+#endif
+}
diff --git a/i386/i386at/gpl/linux/block/ide-cd.c b/i386/i386at/gpl/linux/block/ide-cd.c
new file mode 100644
index 0000000..6dc9380
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/ide-cd.c
@@ -0,0 +1,2770 @@
+/*
+ * linux/drivers/block/ide-cd.c
+ *
+ * 1.00  Oct 31, 1994 -- Initial version.
+ * 1.01  Nov  2, 1994 -- Fixed problem with starting request in
+ *                       cdrom_check_status.
+ * 1.03  Nov 25, 1994 -- leaving unmask_intr[] as a user-setting (as for disks)
+ * (from mlord)       -- minor changes to cdrom_setup()
+ *                    -- renamed ide_dev_s to ide_drive_t, enable irq on command
+ * 2.00  Nov 27, 1994 -- Generalize packet command interface;
+ *                       add audio ioctls.
+ * 2.01  Dec  3, 1994 -- Rework packet command interface to handle devices
+ *                       which send an interrupt when ready for a command.
+ * 2.02  Dec 11, 1994 -- Cache the TOC in the driver.
+ *                       Don't use SCMD_PLAYAUDIO_TI; it's not included
+ *                       in the current version of ATAPI.
+ *                       Try to use LBA instead of track or MSF addressing
+ *                       when possible.
+ *                       Don't wait for READY_STAT.
+ * 2.03  Jan 10, 1995 -- Rewrite block read routines to handle block sizes
+ *                       other than 2k and to move multiple sectors in a
+ *                       single transaction.
+ * 2.04  Apr 21, 1995 -- Add work-around for Creative Labs CD220E drives.
+ *                       Thanks to Nick Saw <cwsaw@pts7.pts.mot.com> for
+ *                       help in figuring this out.  Ditto for Acer and
+ *                       Aztech drives, which seem to have the same problem.
+ * 2.04b May 30, 1995 -- Fix to match changes in ide.c version 3.16 -ml
+ * 2.05  Jun  8, 1995 -- Don't attempt to retry after an illegal request
+ *                        or data protect error.
+ *                       Use HWIF and DEV_HWIF macros as in ide.c.
+ *                       Always try to do a request_sense after
+ *                        a failed command.
+ *                       Include an option to give textual descriptions
+ *                        of ATAPI errors.
+ *                       Fix a bug in handling the sector cache which
+ *                        showed up if the drive returned data in 512 byte
+ *                        blocks (like Pioneer drives).  Thanks to
+ *                        Richard Hirst <srh@gpt.co.uk> for diagnosing this.
+ *                       Properly supply the page number field in the
+ *                        MODE_SELECT command.
+ *                       PLAYAUDIO12 is broken on the Aztech; work around it.
+ * 2.05x Aug 11, 1995 -- lots of data structure renaming/restructuring in ide.c
+ *                       (my apologies to Scott, but now ide-cd.c is independent)
+ * 3.00  Aug 22, 1995 -- Implement CDROMMULTISESSION ioctl.
+ *                       Implement CDROMREADAUDIO ioctl (UNTESTED).
+ *                       Use input_ide_data() and output_ide_data().
+ *                       Add door locking.
+ *                       Fix usage count leak in cdrom_open, which happened
+ *                        when a read-write mount was attempted.
+ *                       Try to load the disk on open.
+ *                       Implement CDROMEJECT_SW ioctl (off by default).
+ *                       Read total cdrom capacity during open.
+ *                       Rearrange logic in cdrom_decode_status.  Issue
+ *                        request sense commands for failed packet commands
+ *                        from here instead of from cdrom_queue_packet_command.
+ *                        Fix a race condition in retrieving error information.
+ *                       Suppress printing normal unit attention errors and
+ *                        some drive not ready errors.
+ *                       Implement CDROMVOLREAD ioctl.
+ *                       Implement CDROMREADMODE1/2 ioctls.
+ *                       Fix race condition in setting up interrupt handlers
+ *                        when the `serialize' option is used.
+ * 3.01  Sep  2, 1995 -- Fix ordering of reenabling interrupts in
+ *                        cdrom_queue_request.
+ *                       Another try at using ide_[input,output]_data.
+ * 3.02  Sep 16, 1995 -- Stick total disk capacity in partition table as well.
+ *                       Make VERBOSE_IDE_CD_ERRORS dump failed command again.
+ *                       Dump out more information for ILLEGAL REQUEST errs.
+ *                       Fix handling of errors occuring before the
+ *                        packet command is transferred.
+ *                       Fix transfers with odd bytelengths.
+ * 3.03  Oct 27, 1995 -- Some Creative drives have an id of just `CD'.
+ *                       `DCI-2S10' drives are broken too.
+ * 3.04  Nov 20, 1995 -- So are Vertos drives.
+ * 3.05  Dec  1, 1995 -- Changes to go with overhaul of ide.c and ide-tape.c
+ * 3.06  Dec 16, 1995 -- Add support needed for partitions.
+ *                       More workarounds for Vertos bugs (based on patches
+ *                        from Holger Dietze <dietze@aix520.informatik.uni-leipzig.de>).
+ *                       Try to eliminate byteorder assumptions.
+ *                       Use atapi_cdrom_subchnl struct definition.
+ *                       Add STANDARD_ATAPI compilation option.
+ * 3.07  Jan 29, 1996 -- More twiddling for broken drives: Sony 55D,
+ *                        Vertos 300.
+ *                       Add NO_DOOR_LOCKING configuration option.
+ *                       Handle drive_cmd requests w/NULL args (for hdparm -t).
+ *                       Work around sporadic Sony55e audio play problem.
+ * 3.07a Feb 11, 1996 -- check drive->id for NULL before dereferencing, to fix
+ *                        problem with "hde=cdrom" with no drive present.  -ml
+ *
+ * NOTE: Direct audio reads will only work on some types of drive.
+ * So far, i've received reports of success for Sony and Toshiba drives.
+ *
+ * ATAPI cd-rom driver.  To be used with ide.c.
+ *
+ * Copyright (C) 1994, 1995, 1996  scott snyder  <snyder@fnald0.fnal.gov>
+ * May be copied or modified under the terms of the GNU General Public License
+ * (../../COPYING).
+ */
+
+
+/***************************************************************************/
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/malloc.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/cdrom.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+#include <asm/segment.h>
+#ifdef __alpha__
+# include <asm/unaligned.h>
+#endif
+
+#include "ide.h"
+
+
+
+/* Turn this on to have the driver print out the meanings of the
+   ATAPI error codes.  This will use up additional kernel-space
+   memory, though. */
+
+#ifndef VERBOSE_IDE_CD_ERRORS
+#define VERBOSE_IDE_CD_ERRORS 0
+#endif
+
+
+/* Turning this on will remove code to work around various nonstandard
+   ATAPI implementations.  If you know your drive follows the standard,
+   this will give you a slightly smaller kernel. */
+
+#ifndef STANDARD_ATAPI
+#define STANDARD_ATAPI 0
+#endif
+
+
+/* Turning this on will disable the door-locking functionality.
+   This is apparently needed for supermount. */
+
+#ifndef NO_DOOR_LOCKING
+#define NO_DOOR_LOCKING 0
+#endif
+
+
+/************************************************************************/
+
+#define SECTOR_SIZE 512
+#define SECTOR_BITS 9
+#define SECTORS_PER_FRAME (CD_FRAMESIZE / SECTOR_SIZE)
+
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+
+/* special command codes for strategy routine. */
+#define PACKET_COMMAND        4315
+#define REQUEST_SENSE_COMMAND 4316
+#define RESET_DRIVE_COMMAND   4317
+
+/* Some ATAPI command opcodes (just like SCSI).
+   (Some other cdrom-specific codes are in cdrom.h.) */
+#define TEST_UNIT_READY         0x00
+#define REQUEST_SENSE           0x03
+#define START_STOP              0x1b
+#define ALLOW_MEDIUM_REMOVAL    0x1e
+#define READ_CAPACITY		0x25
+#define READ_10                 0x28
+#define MODE_SENSE_10           0x5a
+#define MODE_SELECT_10          0x55
+#define READ_CD                 0xbe
+
+
+/* ATAPI sense keys (mostly copied from scsi.h). */
+
+#define NO_SENSE                0x00
+#define RECOVERED_ERROR         0x01
+#define NOT_READY               0x02
+#define MEDIUM_ERROR            0x03
+#define HARDWARE_ERROR          0x04
+#define ILLEGAL_REQUEST         0x05
+#define UNIT_ATTENTION          0x06
+#define DATA_PROTECT            0x07
+#define ABORTED_COMMAND         0x0b
+#define MISCOMPARE              0x0e
+
+/* We want some additional flags for cd-rom drives.
+   To save space in the ide_drive_t struct, use some fields which
+   doesn't make sense for cd-roms -- `bios_sect' and `bios_head'. */
+
+/* Configuration flags.  These describe the capabilities of the drive.
+   They generally do not change after initialization, unless we learn
+   more about the drive from stuff failing. */
+struct ide_cd_config_flags {
+  __u8 drq_interrupt : 1; /* Device sends an interrupt when ready
+                                 for a packet command. */
+  __u8 no_doorlock   : 1; /* Drive cannot lock the door. */
+#if ! STANDARD_ATAPI
+  __u8 no_playaudio12: 1; /* The PLAYAUDIO12 command is not supported. */
+ 
+  __u8 no_lba_toc    : 1; /* Drive cannot return TOC info in LBA format. */
+  __u8 playmsf_uses_bcd : 1; /* Drive uses BCD in PLAYAUDIO_MSF. */
+  __u8 old_readcd    : 1; /* Drive uses old READ CD opcode. */
+  __u8 vertos_lossage: 1; /* Drive is a Vertos 300,
+				 and likes to speak BCD. */
+#endif  /* not STANDARD_ATAPI */
+  __u8 reserved : 1;
+};
+#define CDROM_CONFIG_FLAGS(drive) ((struct ide_cd_config_flags *)&((drive)->bios_sect))
+
+ 
+/* State flags.  These give information about the current state of the
+   drive, and will change during normal operation. */
+struct ide_cd_state_flags {
+  __u8 media_changed : 1; /* Driver has noticed a media change. */
+  __u8 toc_valid     : 1; /* Saved TOC information is current. */
+  __u8 door_locked   : 1; /* We think that the drive door is locked. */
+  __u8 eject_on_close: 1; /* Drive should eject when device is closed. */
+  __u8 reserved : 4;
+};
+#define CDROM_STATE_FLAGS(drive)  ((struct ide_cd_state_flags *)&((drive)->bios_head))
+
+
+#define SECTOR_BUFFER_SIZE CD_FRAMESIZE
+
+
+
+/****************************************************************************
+ * Routines to read and write data from/to the drive, using
+ * the routines input_ide_data() and output_ide_data() from ide.c.
+ *
+ * These routines will round up any request for an odd number of bytes,
+ * so if an odd bytecount is specified, be sure that there's at least one
+ * extra byte allocated for the buffer.
+ */
+
+
+static inline
+void cdrom_in_bytes (ide_drive_t *drive, void *buffer, uint bytecount)
+{
+  ++bytecount;
+  ide_input_data (drive, buffer, bytecount / 4);
+  if ((bytecount & 0x03) >= 2)
+    {
+      insw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
+    }
+}
+
+
+static inline
+void cdrom_out_bytes (ide_drive_t *drive, void *buffer, uint bytecount)
+{
+  ++bytecount;
+  ide_output_data (drive, buffer, bytecount / 4);
+  if ((bytecount & 0x03) >= 2)
+    {
+      outsw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
+    }
+}
+
+
+
+/****************************************************************************
+ * Descriptions of ATAPI error codes.
+ */
+
+#define ARY_LEN(a) ((sizeof(a) / sizeof(a[0])))
+
+#if VERBOSE_IDE_CD_ERRORS
+
+/* From Table 124 of the ATAPI 1.2 spec. */
+
+char *sense_key_texts[16] = {
+  "No sense data",
+  "Recovered error",
+  "Not ready",
+  "Medium error",
+  "Hardware error",
+  "Illegal request",
+  "Unit attention",
+  "Data protect",
+  "(reserved)",
+  "(reserved)",
+  "(reserved)",
+  "Aborted command",
+  "(reserved)",
+  "(reserved)",
+  "Miscompare",
+  "(reserved)",
+};
+
+
+/* From Table 125 of the ATAPI 1.2 spec. */
+
+struct {
+  short asc_ascq;
+  char *text;
+} sense_data_texts[] = {
+  { 0x0000, "No additional sense information" },
+  { 0x0011, "Audio play operation in progress" },
+  { 0x0012, "Audio play operation paused" },
+  { 0x0013, "Audio play operation successfully completed" },
+  { 0x0014, "Audio play operation stopped due to error" },
+  { 0x0015, "No current audio status to return" },
+
+  { 0x0200, "No seek complete" },
+
+  { 0x0400, "Logical unit not ready - cause not reportable" },
+  { 0x0401, "Logical unit not ready - in progress (sic) of becoming ready" },
+  { 0x0402, "Logical unit not ready - initializing command required" },
+  { 0x0403, "Logical unit not ready - manual intervention required" },
+
+  { 0x0600, "No reference position found" },
+
+  { 0x0900, "Track following error" },
+  { 0x0901, "Tracking servo failure" },
+  { 0x0902, "Focus servo failure" },
+  { 0x0903, "Spindle servo failure" },
+
+  { 0x1100, "Unrecovered read error" },
+  { 0x1106, "CIRC unrecovered error" },
+
+  { 0x1500, "Random positioning error" },
+  { 0x1501, "Mechanical positioning error" },
+  { 0x1502, "Positioning error detected by read of medium" },
+
+  { 0x1700, "Recovered data with no error correction applied" },
+  { 0x1701, "Recovered data with retries" },
+  { 0x1702, "Recovered data with positive head offset" },
+  { 0x1703, "Recovered data with negative head offset" },
+  { 0x1704, "Recovered data with retries and/or CIRC applied" },
+  { 0x1705, "Recovered data using previous sector ID" },
+
+  { 0x1800, "Recovered data with error correction applied" },
+  { 0x1801, "Recovered data with error correction and retries applied" },
+  { 0x1802, "Recovered data - the data was auto-reallocated" },
+  { 0x1803, "Recovered data with CIRC" },
+  { 0x1804, "Recovered data with L-EC" },
+  { 0x1805, "Recovered data - recommend reassignment" },
+  { 0x1806, "Recovered data - recommend rewrite" },
+
+  { 0x1a00, "Parameter list length error" },
+
+  { 0x2000, "Invalid command operation code" },
+
+  { 0x2100, "Logical block address out of range" },
+
+  { 0x2400, "Invalid field in command packet" },
+
+  { 0x2600, "Invalid field in parameter list" },
+  { 0x2601, "Parameter not supported" },
+  { 0x2602, "Parameter value invalid" },
+  { 0x2603, "Threshold parameters not supported" },
+
+  { 0x2800, "Not ready to ready transition, medium may have changed" },
+
+  { 0x2900, "Power on, reset or bus device reset occurred" },
+
+  { 0x2a00, "Parameters changed" },
+  { 0x2a01, "Mode parameters changed" },
+
+  { 0x3000, "Incompatible medium installed" },
+  { 0x3001, "Cannot read medium - unknown format" },
+  { 0x3002, "Cannot read medium - incompatible format" },
+
+  { 0x3700, "Rounded parameter" },
+
+  { 0x3900, "Saving parameters not supported" },
+
+  { 0x3a00, "Medium not present" },
+
+  { 0x3f00, "ATAPI CD-ROM drive operating conditions have changed" },
+  { 0x3f01, "Microcode has been changed" },
+  { 0x3f02, "Changed operating definition" },
+  { 0x3f03, "Inquiry data has changed" },
+
+  { 0x4000, "Diagnostic failure on component (ASCQ)" },
+
+  { 0x4400, "Internal ATAPI CD-ROM drive failure" },
+
+  { 0x4e00, "Overlapped commands attempted" },
+
+  { 0x5300, "Media load or eject failed" },
+  { 0x5302, "Medium removal prevented" },
+
+  { 0x5700, "Unable to recover table of contents" },
+
+  { 0x5a00, "Operator request or state change input (unspecified)" },
+  { 0x5a01, "Operator medium removal request" },
+
+  { 0x5b00, "Threshold condition met" },
+
+  { 0x5c00, "Status change" },
+
+  { 0x6300, "End of user area encountered on this track" },
+
+  { 0x6400, "Illegal mode for this track" },
+
+  { 0xbf00, "Loss of streaming" },
+};
+#endif
+
+
+
+/****************************************************************************
+ * Generic packet command support and error handling routines.
+ */
+
+
+static
+void cdrom_analyze_sense_data (ide_drive_t *drive, 
+			       struct atapi_request_sense *reqbuf,
+			       struct packet_command *failed_command)
+{
+  /* Don't print not ready or unit attention errors for READ_SUBCHANNEL.
+     Workman (and probably other programs) uses this command to poll
+     the drive, and we don't want to fill the syslog with useless errors. */
+  if (failed_command &&
+      failed_command->c[0] == SCMD_READ_SUBCHANNEL &&
+      (reqbuf->sense_key == NOT_READY || reqbuf->sense_key == UNIT_ATTENTION))
+    return;
+
+#if VERBOSE_IDE_CD_ERRORS
+  {
+    int i;
+    char *s;
+    char buf[80];
+
+    printk ("ATAPI device %s:\n", drive->name);
+
+    printk ("  Error code: 0x%02x\n", reqbuf->error_code);
+
+    if (reqbuf->sense_key >= 0 &&
+	reqbuf->sense_key < ARY_LEN (sense_key_texts))
+      s = sense_key_texts[reqbuf->sense_key];
+    else
+      s = "(bad sense key)";
+
+    printk ("  Sense key: 0x%02x - %s\n", reqbuf->sense_key, s);
+
+    if (reqbuf->asc == 0x40) {
+      sprintf (buf, "Diagnostic failure on component 0x%02x", reqbuf->ascq);
+      s = buf;
+    }
+
+    else {
+      int lo, hi;
+      int key = (reqbuf->asc << 8);
+      if ( ! (reqbuf->ascq >= 0x80 && reqbuf->ascq <= 0xdd) )
+	key |= reqbuf->ascq;
+
+      lo = 0;
+      hi = ARY_LEN (sense_data_texts);
+      s = NULL;
+
+      while (hi > lo) {
+	int mid = (lo + hi) / 2;
+	if (sense_data_texts[mid].asc_ascq == key) {
+	  s = sense_data_texts[mid].text;
+	  break;
+	}
+	else if (sense_data_texts[mid].asc_ascq > key)
+	  hi = mid;
+	else
+	  lo = mid+1;
+      }
+    }
+
+    if (s == NULL) {
+      if (reqbuf->asc > 0x80)
+	s = "(vendor-specific error)";
+      else
+	s = "(reserved error code)";
+    }
+
+    printk ("  Additional sense data: 0x%02x, 0x%02x  - %s\n",
+	    reqbuf->asc, reqbuf->ascq, s);
+
+    if (failed_command != NULL) {
+      printk ("  Failed packet command: ");
+      for (i=0; i<sizeof (failed_command->c); i++)
+	printk ("%02x ", failed_command->c[i]);
+      printk ("\n");
+    }
+
+    if (reqbuf->sense_key == ILLEGAL_REQUEST &&
+	(reqbuf->sense_key_specific[0] & 0x80) != 0)
+      {
+	printk ("  Error in %s byte %d",
+		(reqbuf->sense_key_specific[0] & 0x40) != 0
+		  ? "command packet"
+		  : "command data",
+		(reqbuf->sense_key_specific[1] << 8) +
+		reqbuf->sense_key_specific[2]);
+
+	if ((reqbuf->sense_key_specific[0] & 0x40) != 0)
+	  {
+	    printk (" bit %d", reqbuf->sense_key_specific[0] & 0x07);
+	  }
+
+	printk ("\n");
+      }
+  }
+
+#else
+
+  /* Suppress printing unit attention and `in progress of becoming ready'
+     errors when we're not being verbose. */
+
+  if (reqbuf->sense_key == UNIT_ATTENTION ||
+      (reqbuf->sense_key == NOT_READY && (reqbuf->asc == 4 ||
+					  reqbuf->asc == 0x3a)))
+    return;
+
+  printk ("%s: code: 0x%02x  key: 0x%02x  asc: 0x%02x  ascq: 0x%02x\n",
+	  drive->name,
+	  reqbuf->error_code, reqbuf->sense_key, reqbuf->asc, reqbuf->ascq);
+#endif
+}
+
+
+/* Fix up a possibly partially-processed request so that we can
+   start it over entirely, or even put it back on the request queue. */
+static void restore_request (struct request *rq)
+{
+  if (rq->buffer != rq->bh->b_data)
+    {
+      int n = (rq->buffer - rq->bh->b_data) / SECTOR_SIZE;
+      rq->buffer = rq->bh->b_data;
+      rq->nr_sectors += n;
+      rq->sector -= n;
+    }
+  rq->current_nr_sectors = rq->bh->b_size >> SECTOR_BITS;
+}
+
+
+static void cdrom_queue_request_sense (ide_drive_t *drive, 
+				       struct semaphore *sem,
+				       struct atapi_request_sense *reqbuf,
+				       struct packet_command *failed_command)
+{
+  struct request *rq;
+  struct packet_command *pc;
+  int len;
+
+  /* If the request didn't explicitly specify where to put the sense data,
+     use the statically allocated structure. */
+  if (reqbuf == NULL)
+    reqbuf = &drive->cdrom_info.sense_data;
+
+  /* Make up a new request to retrieve sense information. */
+
+  pc = &HWIF(drive)->request_sense_pc;
+  memset (pc, 0, sizeof (*pc));
+
+  /* The request_sense structure has an odd number of (16-bit) words,
+     which won't work well with 32-bit transfers.  However, we don't care
+     about the last two bytes, so just truncate the structure down
+     to an even length. */
+  len = sizeof (*reqbuf) / 4;
+  len *= 4;
+
+  pc->c[0] = REQUEST_SENSE;
+  pc->c[4] = len;
+  pc->buffer = (char *)reqbuf;
+  pc->buflen = len;
+  pc->sense_data = (struct atapi_request_sense *)failed_command;
+
+  /* stuff the sense request in front of our current request */
+
+  rq = &HWIF(drive)->request_sense_request;
+  ide_init_drive_cmd (rq);
+  rq->cmd = REQUEST_SENSE_COMMAND;
+  rq->buffer = (char *)pc;
+  rq->sem = sem;
+  (void) ide_do_drive_cmd (drive, rq, ide_preempt);
+}
+
+
+static void cdrom_end_request (int uptodate, ide_drive_t *drive)
+{
+  struct request *rq = HWGROUP(drive)->rq;
+
+  /* The code in blk.h can screw us up on error recovery if the block
+     size is larger than 1k.  Fix that up here. */
+  if (!uptodate && rq->bh != 0)
+    {
+      int adj = rq->current_nr_sectors - 1;
+      rq->current_nr_sectors -= adj;
+      rq->sector += adj;
+    }
+
+  if (rq->cmd == REQUEST_SENSE_COMMAND && uptodate)
+    {
+      struct packet_command *pc = (struct packet_command *)rq->buffer;
+      cdrom_analyze_sense_data (drive,
+				(struct atapi_request_sense *)(pc->buffer - pc->c[4]), 
+				(struct packet_command *)pc->sense_data);
+    }
+
+  ide_end_request (uptodate, HWGROUP(drive));
+}
+
+
+/* Mark that we've seen a media change, and invalidate our internal
+   buffers. */
+static void cdrom_saw_media_change (ide_drive_t *drive)
+{
+  CDROM_STATE_FLAGS (drive)->media_changed = 1;
+  CDROM_STATE_FLAGS (drive)->toc_valid = 0;
+  drive->cdrom_info.nsectors_buffered = 0;
+}
+
+
+/* Returns 0 if the request should be continued.
+   Returns 1 if the request was ended. */
+static int cdrom_decode_status (ide_drive_t *drive, int good_stat, int *stat_ret)
+{
+  struct request *rq = HWGROUP(drive)->rq;
+  int stat, err, sense_key, cmd;
+
+  /* Check for errors. */
+  stat = GET_STAT();
+  *stat_ret = stat;
+
+  if (OK_STAT (stat, good_stat, BAD_R_STAT))
+    return 0;
+
+  /* Got an error. */
+  err = IN_BYTE (IDE_ERROR_REG);
+  sense_key = err >> 4;
+
+  if (rq == NULL)
+    printk ("%s : missing request in cdrom_decode_status\n", drive->name);
+  else
+    {
+      cmd = rq->cmd;
+
+      if (cmd == REQUEST_SENSE_COMMAND)
+	{
+	  /* We got an error trying to get sense info from the drive
+	     (probably while trying to recover from a former error).
+	     Just give up. */
+
+	  struct packet_command *pc = (struct packet_command *)rq->buffer;
+	  pc->stat = 1;
+	  cdrom_end_request (1, drive);
+	  ide_error (drive, "request sense failure", stat);
+	  return 1;
+	}
+
+      else if (cmd == PACKET_COMMAND)
+	{
+	  /* All other functions, except for READ. */
+
+	  struct packet_command *pc = (struct packet_command *)rq->buffer;
+	  struct semaphore *sem = NULL;
+
+	  /* Check for tray open. */
+	  if (sense_key == NOT_READY)
+	    {
+	      cdrom_saw_media_change (drive);
+
+	      /* Print an error message to the syslog.
+		 Exception: don't print anything if this is a read subchannel
+		 command.  This is because workman constantly polls the drive
+		 with this command, and we don't want to uselessly fill up
+		 the syslog. */
+	      if (pc->c[0] != SCMD_READ_SUBCHANNEL)
+		printk ("%s : tray open or drive not ready\n", drive->name);
+	    }
+
+	  /* Check for media change. */
+	  else if (sense_key == UNIT_ATTENTION)
+	    {
+	      cdrom_saw_media_change (drive);
+	      printk ("%s: media changed\n", drive->name);
+	    }
+
+	  /* Otherwise, print an error. */
+	  else
+	    {
+	      ide_dump_status (drive, "packet command error", stat);
+	    }
+
+	  /* Set the error flag and complete the request.
+	     Then, if we have a CHECK CONDITION status, queue a request
+	     sense command.  We must be careful, though: we don't want
+	     the thread in cdrom_queue_packet_command to wake up until
+	     the request sense has completed.  We do this by transferring
+	     the semaphore from the packet command request to the
+	     request sense request. */
+
+	  if ((stat & ERR_STAT) != 0)
+	    {
+	      sem = rq->sem;
+	      rq->sem = NULL;
+	    }
+
+	  pc->stat = 1;
+	  cdrom_end_request (1, drive);
+
+	  if ((stat & ERR_STAT) != 0)
+	    cdrom_queue_request_sense (drive, sem, pc->sense_data, pc);
+	}
+
+      else
+	{
+	  /* Handle errors from READ requests. */
+
+	  /* Check for tray open. */
+	  if (sense_key == NOT_READY)
+	    {
+	      cdrom_saw_media_change (drive);
+
+	      /* Fail the request. */
+	      printk ("%s : tray open\n", drive->name);
+	      cdrom_end_request (0, drive);
+	    }
+
+	  /* Check for media change. */
+	  else if (sense_key == UNIT_ATTENTION)
+	    {
+	      cdrom_saw_media_change (drive);
+
+	      /* Arrange to retry the request.
+	         But be sure to give up if we've retried too many times. */
+	      if (++rq->errors > ERROR_MAX)
+		{
+		  cdrom_end_request (0, drive);
+		}
+	    }
+	  /* No point in retrying after an illegal request or
+	     data protect error.*/
+	  else if (sense_key == ILLEGAL_REQUEST || sense_key == DATA_PROTECT)
+	    {
+	      ide_dump_status (drive, "command error", stat);
+	      cdrom_end_request (0, drive);
+	    }
+
+	  /* If there were other errors, go to the default handler. */
+	  else if ((err & ~ABRT_ERR) != 0)
+	    {
+	      ide_error (drive, "cdrom_decode_status", stat);
+	      return 1;
+	    }
+
+	  /* Else, abort if we've racked up too many retries. */
+	  else if ((++rq->errors > ERROR_MAX))
+	    {
+	      cdrom_end_request (0, drive);
+	    }
+
+	  /* If we got a CHECK_CONDITION status, queue a request sense
+	     command. */
+	  if ((stat & ERR_STAT) != 0)
+	    cdrom_queue_request_sense (drive, NULL, NULL, NULL);
+	}
+    }
+
+  /* Retry, or handle the next request. */
+  return 1;
+}
+
+
+/* Set up the device registers for transferring a packet command on DEV,
+   expecting to later transfer XFERLEN bytes.  HANDLER is the routine
+   which actually transfers the command to the drive.  If this is a
+   drq_interrupt device, this routine will arrange for HANDLER to be
+   called when the interrupt from the drive arrives.  Otherwise, HANDLER
+   will be called immediately after the drive is prepared for the transfer. */
+
+static int cdrom_start_packet_command (ide_drive_t *drive, int xferlen,
+				       ide_handler_t *handler)
+{
+  /* Wait for the controller to be idle. */
+  if (ide_wait_stat (drive, 0, BUSY_STAT, WAIT_READY)) return 1;
+
+  /* Set up the controller registers. */
+  OUT_BYTE (0, IDE_FEATURE_REG);
+  OUT_BYTE (0, IDE_NSECTOR_REG);
+  OUT_BYTE (0, IDE_SECTOR_REG);
+
+  OUT_BYTE (xferlen & 0xff, IDE_LCYL_REG);
+  OUT_BYTE (xferlen >> 8  , IDE_HCYL_REG);
+  OUT_BYTE (drive->ctl, IDE_CONTROL_REG);
+
+  if (CDROM_CONFIG_FLAGS (drive)->drq_interrupt)
+    {
+      ide_set_handler (drive, handler, WAIT_CMD);
+      OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG); /* packet command */
+    }
+  else
+    {
+      OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG); /* packet command */
+      (*handler) (drive);
+    }
+
+  return 0;
+}
+
+
+/* Send a packet command to DRIVE described by CMD_BUF and CMD_LEN.
+   The device registers must have already been prepared
+   by cdrom_start_packet_command.
+   HANDLER is the interrupt handler to call when the command completes
+   or there's data ready. */
+static int cdrom_transfer_packet_command (ide_drive_t *drive,
+                                          char *cmd_buf, int cmd_len,
+					  ide_handler_t *handler)
+{
+  if (CDROM_CONFIG_FLAGS (drive)->drq_interrupt)
+    {
+      /* Here we should have been called after receiving an interrupt
+         from the device.  DRQ should how be set. */
+      int stat_dum;
+
+      /* Check for errors. */
+      if (cdrom_decode_status (drive, DRQ_STAT, &stat_dum)) return 1;
+    }
+  else
+    {
+      /* Otherwise, we must wait for DRQ to get set. */
+      if (ide_wait_stat (drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) return 1;
+    }
+
+  /* Arm the interrupt handler. */
+  ide_set_handler (drive, handler, WAIT_CMD);
+
+  /* Send the command to the device. */
+  cdrom_out_bytes (drive, cmd_buf, cmd_len);
+
+  return 0;
+}
+
+
+
+/****************************************************************************
+ * Block read functions.
+ */
+
+/*
+ * Buffer up to SECTORS_TO_TRANSFER sectors from the drive in our sector
+ * buffer.  Once the first sector is added, any subsequent sectors are
+ * assumed to be continuous (until the buffer is cleared).  For the first
+ * sector added, SECTOR is its sector number.  (SECTOR is then ignored until
+ * the buffer is cleared.)
+ */
+static void cdrom_buffer_sectors (ide_drive_t *drive, unsigned long sector,
+                                  int sectors_to_transfer)
+{
+  struct cdrom_info *info = &drive->cdrom_info;
+
+  /* Number of sectors to read into the buffer. */
+  int sectors_to_buffer = MIN (sectors_to_transfer,
+                               (SECTOR_BUFFER_SIZE >> SECTOR_BITS) -
+                                 info->nsectors_buffered);
+
+  char *dest;
+
+  /* If we don't yet have a sector buffer, try to allocate one.
+     If we can't get one atomically, it's not fatal -- we'll just throw
+     the data away rather than caching it. */
+  if (info->sector_buffer == NULL)
+    {
+      info->sector_buffer = (char *) kmalloc (SECTOR_BUFFER_SIZE, GFP_ATOMIC);
+
+      /* If we couldn't get a buffer, don't try to buffer anything... */
+      if (info->sector_buffer == NULL)
+        sectors_to_buffer = 0;
+    }
+
+  /* If this is the first sector in the buffer, remember its number. */
+  if (info->nsectors_buffered == 0)
+    info->sector_buffered = sector;
+
+  /* Read the data into the buffer. */
+  dest = info->sector_buffer + info->nsectors_buffered * SECTOR_SIZE;
+  while (sectors_to_buffer > 0)
+    {
+      cdrom_in_bytes (drive, dest, SECTOR_SIZE);
+      --sectors_to_buffer;
+      --sectors_to_transfer;
+      ++info->nsectors_buffered;
+      dest += SECTOR_SIZE;
+    }
+
+  /* Throw away any remaining data. */
+  while (sectors_to_transfer > 0)
+    {
+      char dum[SECTOR_SIZE];
+      cdrom_in_bytes (drive, dum, sizeof (dum));
+      --sectors_to_transfer;
+    }
+}
+
+
+/*
+ * Check the contents of the interrupt reason register from the cdrom
+ * and attempt to recover if there are problems.  Returns  0 if everything's
+ * ok; nonzero if the request has been terminated.
+ */
+static inline
+int cdrom_read_check_ireason (ide_drive_t *drive, int len, int ireason)
+{
+  ireason &= 3;
+  if (ireason == 2) return 0;
+
+  if (ireason == 0)
+    {
+      /* Whoops... The drive is expecting to receive data from us! */
+      printk ("%s: cdrom_read_intr: "
+              "Drive wants to transfer data the wrong way!\n",
+              drive->name);
+
+      /* Throw some data at the drive so it doesn't hang
+         and quit this request. */
+      while (len > 0)
+        {
+          int dum = 0;
+	  cdrom_out_bytes (drive, &dum, sizeof (dum));
+          len -= sizeof (dum);
+        }
+    }
+
+  else
+    {
+      /* Drive wants a command packet, or invalid ireason... */
+      printk ("%s: cdrom_read_intr: bad interrupt reason %d\n",
+              drive->name, ireason);
+    }
+
+  cdrom_end_request (0, drive);
+  return -1;
+}
+
+
+/*
+ * Interrupt routine.  Called when a read request has completed.
+ */
+static void cdrom_read_intr (ide_drive_t *drive)
+{
+  int stat;
+  int ireason, len, sectors_to_transfer, nskip;
+
+  struct request *rq = HWGROUP(drive)->rq;
+
+  /* Check for errors. */
+  if (cdrom_decode_status (drive, 0, &stat)) return;
+
+  /* Read the interrupt reason and the transfer length. */
+  ireason = IN_BYTE (IDE_NSECTOR_REG);
+  len = IN_BYTE (IDE_LCYL_REG) + 256 * IN_BYTE (IDE_HCYL_REG);
+
+  /* If DRQ is clear, the command has completed. */
+  if ((stat & DRQ_STAT) == 0)
+    {
+      /* If we're not done filling the current buffer, complain.
+         Otherwise, complete the command normally. */
+      if (rq->current_nr_sectors > 0)
+        {
+          printk ("%s: cdrom_read_intr: data underrun (%ld blocks)\n",
+                  drive->name, rq->current_nr_sectors);
+          cdrom_end_request (0, drive);
+        }
+      else
+        cdrom_end_request (1, drive);
+
+      return;
+    }
+
+  /* Check that the drive is expecting to do the same thing that we are. */
+  if (cdrom_read_check_ireason (drive, len, ireason)) return;
+
+  /* Assume that the drive will always provide data in multiples of at least
+     SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise. */
+  if ((len % SECTOR_SIZE) != 0)
+    {
+      printk ("%s: cdrom_read_intr: Bad transfer size %d\n",
+              drive->name, len);
+      printk ("  This drive is not supported by this version of the driver\n");
+      cdrom_end_request (0, drive);
+      return;
+    }
+
+  /* The number of sectors we need to read from the drive. */
+  sectors_to_transfer = len / SECTOR_SIZE;
+
+  /* First, figure out if we need to bit-bucket any of the leading sectors. */
+  nskip = MIN ((int)(rq->current_nr_sectors - (rq->bh->b_size >> SECTOR_BITS)),
+               sectors_to_transfer);
+
+  while (nskip > 0)
+    {
+      /* We need to throw away a sector. */
+      char dum[SECTOR_SIZE];
+      cdrom_in_bytes (drive, dum, sizeof (dum));
+
+      --rq->current_nr_sectors;
+      --nskip;
+      --sectors_to_transfer;
+    }
+
+  /* Now loop while we still have data to read from the drive. */
+  while (sectors_to_transfer > 0)
+    {
+      int this_transfer;
+
+      /* If we've filled the present buffer but there's another chained
+         buffer after it, move on. */
+      if (rq->current_nr_sectors == 0 &&
+          rq->nr_sectors > 0)
+        cdrom_end_request (1, drive);
+
+      /* If the buffers are full, cache the rest of the data in our
+         internal buffer. */
+      if (rq->current_nr_sectors == 0)
+        {
+          cdrom_buffer_sectors (drive, rq->sector, sectors_to_transfer);
+          sectors_to_transfer = 0;
+        }
+      else
+        {
+          /* Transfer data to the buffers.
+             Figure out how many sectors we can transfer
+             to the current buffer. */
+          this_transfer = MIN (sectors_to_transfer,
+                               rq->current_nr_sectors);
+
+          /* Read this_transfer sectors into the current buffer. */
+          while (this_transfer > 0)
+            {
+              cdrom_in_bytes (drive, rq->buffer, SECTOR_SIZE);
+              rq->buffer += SECTOR_SIZE;
+              --rq->nr_sectors;
+              --rq->current_nr_sectors;
+              ++rq->sector;
+              --this_transfer;
+              --sectors_to_transfer;
+            }
+        }
+    }
+
+  /* Done moving data!
+     Wait for another interrupt. */
+  ide_set_handler (drive, &cdrom_read_intr, WAIT_CMD);
+}
+
+
+/*
+ * Try to satisfy some of the current read request from our cached data.
+ * Returns nonzero if the request has been completed, zero otherwise.
+ */
+static int cdrom_read_from_buffer (ide_drive_t *drive)
+{
+  struct cdrom_info *info = &drive->cdrom_info;
+  struct request *rq = HWGROUP(drive)->rq;
+
+  /* Can't do anything if there's no buffer. */
+  if (info->sector_buffer == NULL) return 0;
+
+  /* Loop while this request needs data and the next block is present
+     in our cache. */
+  while (rq->nr_sectors > 0 &&
+         rq->sector >= info->sector_buffered &&
+         rq->sector < info->sector_buffered + info->nsectors_buffered)
+    {
+      if (rq->current_nr_sectors == 0)
+        cdrom_end_request (1, drive);
+
+      memcpy (rq->buffer,
+              info->sector_buffer +
+                (rq->sector - info->sector_buffered) * SECTOR_SIZE,
+              SECTOR_SIZE);
+      rq->buffer += SECTOR_SIZE;
+      --rq->current_nr_sectors;
+      --rq->nr_sectors;
+      ++rq->sector;
+    }
+
+  /* If we've satisfied the current request, terminate it successfully. */
+  if (rq->nr_sectors == 0)
+    {
+      cdrom_end_request (1, drive);
+      return -1;
+    }
+
+  /* Move on to the next buffer if needed. */
+  if (rq->current_nr_sectors == 0)
+    cdrom_end_request (1, drive);
+
+  /* If this condition does not hold, then the kluge i use to
+     represent the number of sectors to skip at the start of a transfer
+     will fail.  I think that this will never happen, but let's be
+     paranoid and check. */
+  if (rq->current_nr_sectors < (rq->bh->b_size >> SECTOR_BITS) &&
+      (rq->sector % SECTORS_PER_FRAME) != 0)
+    {
+      printk ("%s: cdrom_read_from_buffer: buffer botch (%ld)\n",
+              drive->name, rq->sector);
+      cdrom_end_request (0, drive);
+      return -1;
+    }
+
+  return 0;
+}
+
+
+
+/*
+ * Routine to send a read packet command to the drive.
+ * This is usually called directly from cdrom_start_read.
+ * However, for drq_interrupt devices, it is called from an interrupt
+ * when the drive is ready to accept the command.
+ */
+static void cdrom_start_read_continuation (ide_drive_t *drive)
+{
+  struct packet_command pc;
+  struct request *rq = HWGROUP(drive)->rq;
+
+  int nsect, sector, nframes, frame, nskip;
+
+  /* Number of sectors to transfer. */
+  nsect = rq->nr_sectors;
+
+  /* Starting sector. */
+  sector = rq->sector;
+
+  /* If the requested sector doesn't start on a cdrom block boundary,
+     we must adjust the start of the transfer so that it does,
+     and remember to skip the first few sectors.  If the CURRENT_NR_SECTORS
+     field is larger than the size of the buffer, it will mean that
+     we're to skip a number of sectors equal to the amount by which
+     CURRENT_NR_SECTORS is larger than the buffer size. */
+  nskip = (sector % SECTORS_PER_FRAME);
+  if (nskip > 0)
+    {
+      /* Sanity check... */
+      if (rq->current_nr_sectors != (rq->bh->b_size >> SECTOR_BITS))
+        {
+          printk ("%s: cdrom_start_read_continuation: buffer botch (%ld)\n",
+                  drive->name, rq->current_nr_sectors);
+          cdrom_end_request (0, drive);
+          return;
+        }
+
+      sector -= nskip;
+      nsect += nskip;
+      rq->current_nr_sectors += nskip;
+    }
+
+  /* Convert from sectors to cdrom blocks, rounding up the transfer
+     length if needed. */
+  nframes = (nsect + SECTORS_PER_FRAME-1) / SECTORS_PER_FRAME;
+  frame = sector / SECTORS_PER_FRAME;
+
+  /* Largest number of frames was can transfer at once is 64k-1. */
+  nframes = MIN (nframes, 65535);
+
+  /* Set up the command */
+  memset (&pc.c, 0, sizeof (pc.c));
+  pc.c[0] = READ_10;
+  pc.c[7] = (nframes >> 8);
+  pc.c[8] = (nframes & 0xff);
+#ifdef __alpha__
+  stl_u (htonl (frame), (unsigned int *) &pc.c[2]);
+#else
+  *(int *)(&pc.c[2]) = htonl (frame);
+#endif
+
+  /* Send the command to the drive and return. */
+  (void) cdrom_transfer_packet_command (drive, pc.c, sizeof (pc.c),
+					&cdrom_read_intr);
+}
+
+
+/*
+ * Start a read request from the CD-ROM.
+ */
+static void cdrom_start_read (ide_drive_t *drive, unsigned int block)
+{
+  struct request *rq = HWGROUP(drive)->rq;
+  int minor = MINOR (rq->rq_dev);
+
+  /* If the request is relative to a partition, fix it up to refer to the
+     absolute address.  */
+  if ((minor & PARTN_MASK) != 0) {
+    rq->sector = block;
+    minor &= ~PARTN_MASK;
+    rq->rq_dev = MKDEV (MAJOR(rq->rq_dev), minor);
+  }
+
+  /* We may be retrying this request after an error.
+     Fix up any weirdness which might be present in the request packet. */
+  restore_request (rq);
+
+  /* Satisfy whatever we can of this request from our cached sector. */
+  if (cdrom_read_from_buffer (drive))
+    return;
+
+  /* Clear the local sector buffer. */
+  drive->cdrom_info.nsectors_buffered = 0;
+
+  /* Start sending the read request to the drive. */
+  cdrom_start_packet_command (drive, 32768, cdrom_start_read_continuation);
+}
+
+
+
+
+/****************************************************************************
+ * Execute all other packet commands.
+ */
+
+/* Forward declarations. */
+static int
+cdrom_lockdoor (ide_drive_t *drive, int lockflag,
+		struct atapi_request_sense *reqbuf);
+
+
+
+/* Interrupt routine for packet command completion. */
+static void cdrom_pc_intr (ide_drive_t *drive)
+{
+  int ireason, len, stat, thislen;
+  struct request *rq = HWGROUP(drive)->rq;
+  struct packet_command *pc = (struct packet_command *)rq->buffer;
+
+  /* Check for errors. */
+  if (cdrom_decode_status (drive, 0, &stat)) return;
+
+  /* Read the interrupt reason and the transfer length. */
+  ireason = IN_BYTE (IDE_NSECTOR_REG);
+  len = IN_BYTE (IDE_LCYL_REG) + 256 * IN_BYTE (IDE_HCYL_REG);
+
+  /* If DRQ is clear, the command has completed.
+     Complain if we still have data left to transfer. */
+  if ((stat & DRQ_STAT) == 0)
+    {
+      /* Some of the trailing request sense fields are optional, and
+	 some drives don't send them.  Sigh. */
+      if (pc->c[0] == REQUEST_SENSE && pc->buflen > 0 && pc->buflen <= 5) {
+	while (pc->buflen > 0) {
+	  *pc->buffer++ = 0;
+	  --pc->buflen;
+	}
+      }
+
+      if (pc->buflen == 0)
+        cdrom_end_request (1, drive);
+      else
+        {
+          printk ("%s: cdrom_pc_intr: data underrun %d\n",
+                  drive->name, pc->buflen);
+          pc->stat = 1;
+          cdrom_end_request (1, drive);
+        }
+      return;
+    }
+
+  /* Figure out how much data to transfer. */
+  thislen = pc->buflen;
+  if (thislen < 0) thislen = -thislen;
+  if (thislen > len) thislen = len;
+
+  /* The drive wants to be written to. */
+  if ((ireason & 3) == 0)
+    {
+      /* Check that we want to write. */
+      if (pc->buflen > 0)
+        {
+          printk ("%s: cdrom_pc_intr: Drive wants to transfer data the wrong way!\n",
+                  drive->name);
+          pc->stat = 1;
+          thislen = 0;
+        }
+
+      /* Transfer the data. */
+      cdrom_out_bytes (drive, pc->buffer, thislen);
+
+      /* If we haven't moved enough data to satisfy the drive,
+         add some padding. */
+      while (len > thislen)
+        {
+          int dum = 0;
+	  cdrom_out_bytes (drive, &dum, sizeof (dum));
+          len -= sizeof (dum);
+        }
+
+      /* Keep count of how much data we've moved. */
+      pc->buffer += thislen;
+      pc->buflen += thislen;
+    }
+
+  /* Same drill for reading. */
+  else if ((ireason & 3) == 2)
+    {
+      /* Check that we want to read. */
+      if (pc->buflen < 0)
+        {
+          printk ("%s: cdrom_pc_intr: Drive wants to transfer data the wrong way!\n",
+                  drive->name);
+          pc->stat = 1;
+          thislen = 0;
+        }
+
+      /* Transfer the data. */
+      cdrom_in_bytes (drive, pc->buffer, thislen);
+
+      /* If we haven't moved enough data to satisfy the drive,
+         add some padding. */
+      while (len > thislen)
+        {
+          int dum = 0;
+	  cdrom_in_bytes (drive, &dum, sizeof (dum));
+          len -= sizeof (dum);
+        }
+
+      /* Keep count of how much data we've moved. */
+      pc->buffer += thislen;
+      pc->buflen -= thislen;
+    }
+
+  else
+    {
+      printk ("%s: cdrom_pc_intr: The drive appears confused (ireason = 0x%2x)\n",
+              drive->name, ireason);
+      pc->stat = 1;
+    }
+
+  /* Now we wait for another interrupt. */
+  ide_set_handler (drive, &cdrom_pc_intr, WAIT_CMD);
+}
+
+
+static void cdrom_do_pc_continuation (ide_drive_t *drive)
+{
+  struct request *rq = HWGROUP(drive)->rq;
+  struct packet_command *pc = (struct packet_command *)rq->buffer;
+
+  /* Send the command to the drive and return. */
+  cdrom_transfer_packet_command (drive, pc->c, sizeof (pc->c), &cdrom_pc_intr);
+}
+
+
+static void cdrom_do_packet_command (ide_drive_t *drive)
+{
+  int len;
+  struct request *rq = HWGROUP(drive)->rq;
+  struct packet_command *pc = (struct packet_command *)rq->buffer;
+
+  len = pc->buflen;
+  if (len < 0) len = -len;
+
+  pc->stat = 0;
+
+  /* Start sending the command to the drive. */
+  cdrom_start_packet_command (drive, len, cdrom_do_pc_continuation);
+}
+
+#ifndef MACH
+/* Sleep for TIME jiffies.
+   Not to be called from an interrupt handler. */
+static
+void cdrom_sleep (int time)
+{
+  current->state = TASK_INTERRUPTIBLE;
+  current->timeout = jiffies + time;
+  schedule ();
+}
+#endif
+
+static
+int cdrom_queue_packet_command (ide_drive_t *drive, struct packet_command *pc)
+{
+  struct atapi_request_sense my_reqbuf;
+  int retries = 10;
+  struct request req;
+
+  /* If our caller has not provided a place to stick any sense data,
+     use our own area. */
+  if (pc->sense_data == NULL)
+    pc->sense_data = &my_reqbuf;
+  pc->sense_data->sense_key = 0;
+
+  /* Start of retry loop. */
+  do {
+    ide_init_drive_cmd (&req);
+    req.cmd = PACKET_COMMAND;
+    req.buffer = (char *)pc;
+    (void) ide_do_drive_cmd (drive, &req, ide_wait);
+
+    if (pc->stat != 0)
+      {
+	/* The request failed.  Retry if it was due to a unit attention status
+	   (usually means media was changed). */
+	struct atapi_request_sense *reqbuf = pc->sense_data;
+
+	if (reqbuf->sense_key == UNIT_ATTENTION)
+	  ;
+
+	/* Also retry if the drive is in the process of loading a disk.
+	   This time, however, wait a little between retries to give
+	   the drive time. */
+	else if (reqbuf->sense_key == NOT_READY && reqbuf->asc == 4)
+	  {
+	    cdrom_sleep (HZ);
+	  }
+
+	/* Otherwise, don't retry. */
+	else
+	  retries = 0;
+
+	--retries;
+      }
+
+    /* End of retry loop. */
+  } while (pc->stat != 0 && retries >= 0);
+
+
+  /* Return an error if the command failed. */
+  if (pc->stat != 0)
+    return -EIO;
+
+  else
+    {
+      /* The command succeeded.  If it was anything other than a request sense,
+	 eject, or door lock command, and we think that the door is presently
+	 unlocked, lock it again.  (The door was probably unlocked via
+	 an explicit CDROMEJECT ioctl.) */
+      if (CDROM_STATE_FLAGS (drive)->door_locked == 0 &&
+	  (pc->c[0] != REQUEST_SENSE &&
+	   pc->c[0] != ALLOW_MEDIUM_REMOVAL &&
+	   pc->c[0] != START_STOP))
+	{
+	  (void) cdrom_lockdoor (drive, 1, NULL);
+	}
+      return 0;
+    }
+}
+
+
+
+/****************************************************************************
+ * drive_cmd handling.
+ *
+ * Most of the functions accessed via drive_cmd are not valid for ATAPI
+ * devices.  Only attempt to execute those which actually should be valid.
+ */
+
+static
+void cdrom_do_drive_cmd (ide_drive_t *drive)
+{
+  struct request *rq = HWGROUP(drive)->rq;
+  byte *args = rq->buffer;
+
+  if (args)
+    {
+#if 0  /* This bit isn't done yet... */
+      if (args[0] == WIN_SETFEATURES &&
+	  (args[2] == 0x66 || args[2] == 0xcc || args[2] == 0x02 ||
+	   args[2] == 0xdd || args[2] == 0x5d))
+	{
+	  OUT_BYTE (args[2], io_base + IDE_FEATURE_OFFSET);
+	  <send cmd>
+	}
+      else
+#endif
+	{
+	  printk ("%s: Unsupported drive command %02x %02x %02x\n",
+		  drive->name, args[0], args[1], args[2]);
+	  rq->errors = 1;
+	}
+    }
+
+  cdrom_end_request (1, drive);
+}
+
+
+
+/****************************************************************************
+ * cdrom driver request routine.
+ */
+
+void ide_do_rw_cdrom (ide_drive_t *drive, unsigned long block)
+{
+  struct request *rq = HWGROUP(drive)->rq;
+
+  if (rq -> cmd == PACKET_COMMAND || rq -> cmd == REQUEST_SENSE_COMMAND)
+    cdrom_do_packet_command (drive);
+
+  else if (rq -> cmd == RESET_DRIVE_COMMAND)
+    {
+      cdrom_end_request (1, drive);
+      ide_do_reset (drive);
+      return;
+    }
+
+  else if (rq -> cmd == IDE_DRIVE_CMD)
+    cdrom_do_drive_cmd (drive);
+
+  else if (rq -> cmd != READ)
+    {
+      printk ("ide-cd: bad cmd %d\n", rq -> cmd);
+      cdrom_end_request (0, drive);
+    }
+  else
+    cdrom_start_read (drive, block);
+}
+
+
+
+/****************************************************************************
+ * Ioctl handling.
+ *
+ * Routines which queue packet commands take as a final argument a pointer
+ * to an atapi_request_sense struct.  If execution of the command results
+ * in an error with a CHECK CONDITION status, this structure will be filled
+ * with the results of the subsequent request sense command.  The pointer
+ * can also be NULL, in which case no sense information is returned.
+ */
+
+#if ! STANDARD_ATAPI
+static
+int bin2bcd (int x)
+{
+  return (x%10) | ((x/10) << 4);
+}
+
+
+static
+int bcd2bin (int x)
+{
+  return (x >> 4) * 10 + (x & 0x0f);
+}
+#endif /* not STANDARD_ATAPI */
+
+
+static inline
+void lba_to_msf (int lba, byte *m, byte *s, byte *f)
+{
+  lba += CD_BLOCK_OFFSET;
+  lba &= 0xffffff;  /* negative lbas use only 24 bits */
+  *m = lba / (CD_SECS * CD_FRAMES);
+  lba %= (CD_SECS * CD_FRAMES);
+  *s = lba / CD_FRAMES;
+  *f = lba % CD_FRAMES;
+}
+
+
+static inline
+int msf_to_lba (byte m, byte s, byte f)
+{
+  return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_BLOCK_OFFSET;
+}
+
+
+static int
+cdrom_check_status (ide_drive_t  *drive,
+		    struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+
+  pc.sense_data = reqbuf;
+  pc.c[0] = TEST_UNIT_READY;
+
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+/* Lock the door if LOCKFLAG is nonzero; unlock it otherwise. */
+static int
+cdrom_lockdoor (ide_drive_t *drive, int lockflag,
+		struct atapi_request_sense *reqbuf)
+{
+  struct atapi_request_sense my_reqbuf;
+  int stat;
+  struct packet_command pc;
+
+  if (reqbuf == NULL)
+    reqbuf = &my_reqbuf;
+
+  /* If the drive cannot lock the door, just pretend. */
+  if (CDROM_CONFIG_FLAGS (drive)->no_doorlock)
+    stat = 0;
+  else
+    {
+      memset (&pc, 0, sizeof (pc));
+      pc.sense_data = reqbuf;
+
+      pc.c[0] = ALLOW_MEDIUM_REMOVAL;
+      pc.c[4] = (lockflag != 0);
+      stat = cdrom_queue_packet_command (drive, &pc);
+    }
+
+  if (stat == 0)
+    CDROM_STATE_FLAGS (drive)->door_locked = lockflag;
+  else
+    {
+      /* If we got an illegal field error, the drive
+	 probably cannot lock the door. */
+      if (reqbuf->sense_key == ILLEGAL_REQUEST && reqbuf->asc == 0x24)
+	{
+	  printk ("%s: door locking not supported\n", drive->name);
+	  CDROM_CONFIG_FLAGS (drive)->no_doorlock = 1;
+	  stat = 0;
+	  CDROM_STATE_FLAGS (drive)->door_locked = lockflag;
+	}
+    }
+  return stat;
+}
+
+
+/* Eject the disk if EJECTFLAG is 0.
+   If EJECTFLAG is 1, try to reload the disk. */
+static int
+cdrom_eject (ide_drive_t *drive, int ejectflag,
+	     struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.c[0] = START_STOP;
+  pc.c[4] = 2 + (ejectflag != 0);
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+static int
+cdrom_pause (ide_drive_t *drive, int pauseflag,
+	     struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.c[0] = SCMD_PAUSE_RESUME;
+  pc.c[8] = !pauseflag;
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+static int
+cdrom_startstop (ide_drive_t *drive, int startflag,
+		 struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.c[0] = START_STOP;
+  pc.c[1] = 1;
+  pc.c[4] = startflag;
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+static int
+cdrom_read_capacity (ide_drive_t *drive, unsigned *capacity,
+		     struct atapi_request_sense *reqbuf)
+{
+  struct {
+    unsigned lba;
+    unsigned blocklen;
+  } capbuf;
+
+  int stat;
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.c[0] = READ_CAPACITY;
+  pc.buffer = (char *)&capbuf;
+  pc.buflen = sizeof (capbuf);
+
+  stat = cdrom_queue_packet_command (drive, &pc);
+  if (stat == 0)
+    {
+      *capacity = ntohl (capbuf.lba);
+    }
+
+  return stat;
+}
+
+
+static int
+cdrom_read_tocentry (ide_drive_t *drive, int trackno, int msf_flag,
+                     int format, char *buf, int buflen,
+		     struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.buffer =  buf;
+  pc.buflen = buflen;
+  pc.c[0] = SCMD_READ_TOC;
+  pc.c[6] = trackno;
+  pc.c[7] = (buflen >> 8);
+  pc.c[8] = (buflen & 0xff);
+  pc.c[9] = (format << 6);
+  if (msf_flag) pc.c[1] = 2;
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+/* Try to read the entire TOC for the disk into our internal buffer. */
+static int
+cdrom_read_toc (ide_drive_t *drive,
+		struct atapi_request_sense *reqbuf)
+{
+  int msf_flag;
+  int stat, ntracks, i;
+  struct atapi_toc *toc = drive->cdrom_info.toc;
+  struct {
+    struct atapi_toc_header hdr;
+    struct atapi_toc_entry  ent;
+  } ms_tmp;
+
+  if (toc == NULL)
+    {
+      /* Try to allocate space. */
+      toc = (struct atapi_toc *) kmalloc (sizeof (struct atapi_toc),
+                                          GFP_KERNEL);
+      drive->cdrom_info.toc = toc;
+    }
+
+  if (toc == NULL)
+    {
+      printk ("%s: No cdrom TOC buffer!\n", drive->name);
+      return -EIO;
+    }
+
+  /* Check to see if the existing data is still valid.
+     If it is, just return. */
+  if (CDROM_STATE_FLAGS (drive)->toc_valid)
+    (void) cdrom_check_status (drive, NULL);
+
+  if (CDROM_STATE_FLAGS (drive)->toc_valid) return 0;
+
+#if STANDARD_ATAPI
+  msf_flag = 0;
+#else  /* not STANDARD_ATAPI */
+  /* Some drives can't return TOC data in LBA format. */
+  msf_flag = (CDROM_CONFIG_FLAGS (drive)->no_lba_toc);
+#endif  /* not STANDARD_ATAPI */
+
+  /* First read just the header, so we know how long the TOC is. */
+  stat = cdrom_read_tocentry (drive, 0, msf_flag, 0, (char *)&toc->hdr,
+                              sizeof (struct atapi_toc_header) +
+                              sizeof (struct atapi_toc_entry),
+			      reqbuf);
+  if (stat) return stat;
+
+#if ! STANDARD_ATAPI
+  if (CDROM_CONFIG_FLAGS (drive)->vertos_lossage)
+    {
+      toc->hdr.first_track = bcd2bin (toc->hdr.first_track);
+      toc->hdr.last_track  = bcd2bin (toc->hdr.last_track);
+      /* hopefully the length is not BCD, too ;-| */
+    }
+#endif  /* not STANDARD_ATAPI */
+
+  ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
+  if (ntracks <= 0) return -EIO;
+  if (ntracks > MAX_TRACKS) ntracks = MAX_TRACKS;
+
+  /* Now read the whole schmeer. */
+  stat = cdrom_read_tocentry (drive, 0, msf_flag, 0, (char *)&toc->hdr,
+                              sizeof (struct atapi_toc_header) +
+                              (ntracks+1) * sizeof (struct atapi_toc_entry),
+			      reqbuf);
+  if (stat) return stat;
+  toc->hdr.toc_length = ntohs (toc->hdr.toc_length);
+
+#if ! STANDARD_ATAPI
+  if (CDROM_CONFIG_FLAGS (drive)->vertos_lossage)
+    {
+      toc->hdr.first_track = bcd2bin (toc->hdr.first_track);
+      toc->hdr.last_track  = bcd2bin (toc->hdr.last_track);
+      /* hopefully the length is not BCD, too ;-| */
+    }
+#endif  /* not STANDARD_ATAPI */
+
+  for (i=0; i<=ntracks; i++)
+    {
+#if ! STANDARD_ATAPI
+      if (msf_flag)
+	{
+	  if (CDROM_CONFIG_FLAGS (drive)->vertos_lossage)
+	    {
+	      toc->ent[i].track = bcd2bin (toc->ent[i].track);
+	      toc->ent[i].addr.msf.m = bcd2bin (toc->ent[i].addr.msf.m);
+	      toc->ent[i].addr.msf.s = bcd2bin (toc->ent[i].addr.msf.s);
+	      toc->ent[i].addr.msf.f = bcd2bin (toc->ent[i].addr.msf.f);
+	    }
+	  toc->ent[i].addr.lba = msf_to_lba (toc->ent[i].addr.msf.m,
+					     toc->ent[i].addr.msf.s,
+					     toc->ent[i].addr.msf.f);
+	}
+      else
+#endif  /* not STANDARD_ATAPI */
+	toc->ent[i].addr.lba = ntohl (toc->ent[i].addr.lba);
+    }
+
+  /* Read the multisession information. */
+  stat = cdrom_read_tocentry (drive, 0, msf_flag, 1,
+			      (char *)&ms_tmp, sizeof (ms_tmp),
+			      reqbuf);
+  if (stat) return stat;
+#if ! STANDARD_ATAPI
+  if (msf_flag)
+    toc->last_session_lba = msf_to_lba (ms_tmp.ent.addr.msf.m,
+					ms_tmp.ent.addr.msf.s,
+					ms_tmp.ent.addr.msf.f);
+  else
+#endif  /* not STANDARD_ATAPI */
+    toc->last_session_lba = ntohl (ms_tmp.ent.addr.lba);
+
+  toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
+
+  /* Now try to get the total cdrom capacity. */
+  stat = cdrom_read_capacity (drive, &toc->capacity, reqbuf);
+  if (stat) toc->capacity = 0x1fffff;
+
+  HWIF(drive)->gd->sizes[drive->select.b.unit << PARTN_BITS]
+    = toc->capacity * SECTORS_PER_FRAME;
+  drive->part[0].nr_sects = toc->capacity * SECTORS_PER_FRAME;
+
+  /* Remember that we've read this stuff. */
+  CDROM_STATE_FLAGS (drive)->toc_valid = 1;
+
+  return 0;
+}
+
+
+static int
+cdrom_read_subchannel (ide_drive_t *drive,
+                       char *buf, int buflen,
+		       struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.buffer =  buf;
+  pc.buflen = buflen;
+  pc.c[0] = SCMD_READ_SUBCHANNEL;
+  pc.c[2] = 0x40;  /* request subQ data */
+  pc.c[3] = 0x01;  /* Format 1: current position */
+  pc.c[7] = (buflen >> 8);
+  pc.c[8] = (buflen & 0xff);
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+/* modeflag: 0 = current, 1 = changeable mask, 2 = default, 3 = saved */
+static int
+cdrom_mode_sense (ide_drive_t *drive, int pageno, int modeflag,
+                  char *buf, int buflen,
+		  struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.buffer =  buf;
+  pc.buflen = buflen;
+  pc.c[0] = MODE_SENSE_10;
+  pc.c[2] = pageno | (modeflag << 6);
+  pc.c[7] = (buflen >> 8);
+  pc.c[8] = (buflen & 0xff);
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+static int
+cdrom_mode_select (ide_drive_t *drive, int pageno, char *buf, int buflen,
+		   struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.buffer =  buf;
+  pc.buflen = - buflen;
+  pc.c[0] = MODE_SELECT_10;
+  pc.c[1] = 0x10;
+  pc.c[2] = pageno;
+  pc.c[7] = (buflen >> 8);
+  pc.c[8] = (buflen & 0xff);
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+static int
+cdrom_play_lba_range_play12 (ide_drive_t *drive, int lba_start, int lba_end,
+			     struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.c[0] = SCMD_PLAYAUDIO12;
+#ifdef __alpha__
+  stq_u(((long) htonl (lba_end - lba_start) << 32) | htonl(lba_start),
+	(unsigned long *) &pc.c[2]);
+#else
+  *(int *)(&pc.c[2]) = htonl (lba_start);
+  *(int *)(&pc.c[6]) = htonl (lba_end - lba_start);
+#endif
+
+  return cdrom_queue_packet_command (drive, &pc);
+}
+
+
+#if !  STANDARD_ATAPI
+static int
+cdrom_play_lba_range_msf (ide_drive_t *drive, int lba_start, int lba_end,
+			  struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.c[0] = SCMD_PLAYAUDIO_MSF;
+  lba_to_msf (lba_start, &pc.c[3], &pc.c[4], &pc.c[5]);
+  lba_to_msf (lba_end-1, &pc.c[6], &pc.c[7], &pc.c[8]);
+
+  if (CDROM_CONFIG_FLAGS (drive)->playmsf_uses_bcd)
+    {
+      pc.c[3] = bin2bcd (pc.c[3]);
+      pc.c[4] = bin2bcd (pc.c[4]);
+      pc.c[5] = bin2bcd (pc.c[5]);
+      pc.c[6] = bin2bcd (pc.c[6]);
+      pc.c[7] = bin2bcd (pc.c[7]);
+      pc.c[8] = bin2bcd (pc.c[8]);
+    }
+
+  return cdrom_queue_packet_command (drive, &pc);
+}
+#endif  /* not STANDARD_ATAPI */
+
+
+static int
+cdrom_play_lba_range_1 (ide_drive_t *drive, int lba_start, int lba_end,
+			struct atapi_request_sense *reqbuf)
+{
+  /* This is rather annoying.
+     My NEC-260 won't recognize group 5 commands such as PLAYAUDIO12;
+     the only way to get it to play more than 64k of blocks at once
+     seems to be the PLAYAUDIO_MSF command.  However, the parameters
+     the NEC 260 wants for the PLAYMSF command are incompatible with
+     the new version of the spec.
+
+     So what i'll try is this.  First try for PLAYAUDIO12.  If it works,
+     great.  Otherwise, if the drive reports an illegal command code,
+     try PLAYAUDIO_MSF using the NEC 260-style bcd parameters. */
+
+#if ! STANDARD_ATAPI
+  if (CDROM_CONFIG_FLAGS (drive)->no_playaudio12)
+    return cdrom_play_lba_range_msf (drive, lba_start, lba_end, reqbuf);
+  else
+#endif  /* not STANDARD_ATAPI */
+    {
+      int stat;
+      struct atapi_request_sense my_reqbuf;
+
+      if (reqbuf == NULL)
+	reqbuf = &my_reqbuf;
+
+      stat = cdrom_play_lba_range_play12 (drive, lba_start, lba_end, reqbuf);
+      if (stat == 0) return 0;
+
+#if ! STANDARD_ATAPI
+      /* It failed.  Try to find out why. */
+      if (reqbuf->sense_key == ILLEGAL_REQUEST && reqbuf->asc == 0x20)
+        {
+          /* The drive didn't recognize the command.
+             Retry with the MSF variant. */
+          printk ("%s: Drive does not support PLAYAUDIO12; "
+                  "trying PLAYAUDIO_MSF\n", drive->name);
+          CDROM_CONFIG_FLAGS (drive)->no_playaudio12 = 1;
+          CDROM_CONFIG_FLAGS (drive)->playmsf_uses_bcd = 1;
+          return cdrom_play_lba_range_msf (drive, lba_start, lba_end, reqbuf);
+        }
+#endif  /* not STANDARD_ATAPI */
+
+      /* Failed for some other reason.  Give up. */
+      return stat;
+    }
+}
+
+
+/* Play audio starting at LBA LBA_START and finishing with the
+   LBA before LBA_END. */
+static int
+cdrom_play_lba_range (ide_drive_t *drive, int lba_start, int lba_end,
+		      struct atapi_request_sense *reqbuf)
+{
+  int i, stat;
+  struct atapi_request_sense my_reqbuf;
+
+  if (reqbuf == NULL)
+    reqbuf = &my_reqbuf;
+
+  /* Some drives, will, for certain audio cds,
+     give an error if you ask them to play the entire cd using the
+     values which are returned in the TOC.  The play will succeed, however,
+     if the ending address is adjusted downwards by a few frames. */
+  for (i=0; i<75; i++)
+    {
+      stat = cdrom_play_lba_range_1 (drive, lba_start, lba_end, reqbuf);
+
+      if (stat == 0 ||
+          !(reqbuf->sense_key == ILLEGAL_REQUEST && reqbuf->asc == 0x24))
+	return stat;
+
+      --lba_end;
+      if (lba_end <= lba_start) break;
+    }
+
+  return stat;
+}
+
+
+static
+int cdrom_get_toc_entry (ide_drive_t *drive, int track,
+                         struct atapi_toc_entry **ent,
+			 struct atapi_request_sense *reqbuf)
+{
+  int stat, ntracks;
+  struct atapi_toc *toc;
+
+  /* Make sure our saved TOC is valid. */
+  stat = cdrom_read_toc (drive, reqbuf);
+  if (stat) return stat;
+
+  toc = drive->cdrom_info.toc;
+
+  /* Check validity of requested track number. */
+  ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
+  if (track == CDROM_LEADOUT)
+    *ent = &toc->ent[ntracks];
+  else if (track < toc->hdr.first_track ||
+           track > toc->hdr.last_track)
+    return -EINVAL;
+  else
+    *ent = &toc->ent[track - toc->hdr.first_track];
+
+  return 0;
+}
+
+
+static int
+cdrom_read_block (ide_drive_t *drive, int format, int lba,
+		  char *buf, int buflen,
+		  struct atapi_request_sense *reqbuf)
+{
+  struct packet_command pc;
+  struct atapi_request_sense my_reqbuf;
+  int stat;
+
+  if (reqbuf == NULL)
+    reqbuf = &my_reqbuf;
+
+  memset (&pc, 0, sizeof (pc));
+  pc.sense_data = reqbuf;
+
+  pc.buffer = buf;
+  pc.buflen = buflen;
+
+#if ! STANDARD_ATAPI
+  if (CDROM_CONFIG_FLAGS (drive)->old_readcd)
+    pc.c[0] = 0xd4;
+  else
+#endif  /* not STANDARD_ATAPI */
+    pc.c[0] = READ_CD;
+
+  pc.c[1] = (format << 2);
+#ifdef __alpha__
+  stl_u(htonl (lba), (unsigned int *) &pc.c[2]);
+#else
+  *(int *)(&pc.c[2]) = htonl (lba);
+#endif
+  pc.c[8] = 1;  /* one block */
+  pc.c[9] = 0x10;
+
+  stat = cdrom_queue_packet_command (drive, &pc);
+
+#if ! STANDARD_ATAPI
+  /* If the drive doesn't recognize the READ CD opcode, retry the command
+     with an older opcode for that command. */
+  if (stat && reqbuf->sense_key == ILLEGAL_REQUEST && reqbuf->asc == 0x20 &&
+      CDROM_CONFIG_FLAGS (drive)->old_readcd == 0)
+    {
+      printk ("%s: Drive does not recognize READ_CD; trying opcode 0xd4\n",
+	      drive->name);
+      CDROM_CONFIG_FLAGS (drive)->old_readcd = 1;
+      return cdrom_read_block (drive, format, lba, buf, buflen, reqbuf);
+    }
+#endif  /* not STANDARD_ATAPI */
+
+  return stat;
+}
+
+
+int ide_cdrom_ioctl (ide_drive_t *drive, struct inode *inode,
+		     struct file *file, unsigned int cmd, unsigned long arg)
+{
+  switch (cmd)
+    {
+    case CDROMEJECT:
+      {
+	int stat;
+
+	if (drive->usage > 1)
+	  return -EBUSY;
+
+	stat = cdrom_lockdoor (drive, 0, NULL);
+	if (stat) return stat;
+
+	return cdrom_eject (drive, 0, NULL);
+      }
+
+    case CDROMEJECT_SW:
+      {
+	CDROM_STATE_FLAGS (drive)->eject_on_close = arg;
+	return 0;
+      }
+
+    case CDROMPAUSE:
+      return cdrom_pause (drive, 1, NULL);
+
+    case CDROMRESUME:
+      return cdrom_pause (drive, 0, NULL);
+
+    case CDROMSTART:
+      return cdrom_startstop (drive, 1, NULL);
+
+    case CDROMSTOP:
+      {
+	int stat;
+
+	stat = cdrom_startstop (drive, 0, NULL);
+	if (stat) return stat;
+	/* pit says the Dolphin needs this. */
+	return cdrom_eject (drive, 1, NULL);
+      }
+
+    case CDROMPLAYMSF:
+      {
+        struct cdrom_msf msf;
+        int stat, lba_start, lba_end;
+
+        stat = verify_area (VERIFY_READ, (void *)arg, sizeof (msf));
+        if (stat) return stat;
+
+        memcpy_fromfs (&msf, (void *) arg, sizeof(msf));
+
+        lba_start = msf_to_lba (msf.cdmsf_min0, msf.cdmsf_sec0,
+                                msf.cdmsf_frame0);
+        lba_end = msf_to_lba (msf.cdmsf_min1, msf.cdmsf_sec1,
+                              msf.cdmsf_frame1) + 1;
+
+        if (lba_end <= lba_start) return -EINVAL;
+
+        return cdrom_play_lba_range (drive, lba_start, lba_end, NULL);
+      }
+
+    /* Like just about every other Linux cdrom driver, we ignore the
+       index part of the request here. */
+    case CDROMPLAYTRKIND:
+      {
+        int stat, lba_start, lba_end;
+        struct cdrom_ti ti;
+        struct atapi_toc_entry *first_toc, *last_toc;
+
+        stat = verify_area (VERIFY_READ, (void *)arg, sizeof (ti));
+        if (stat) return stat;
+
+        memcpy_fromfs (&ti, (void *) arg, sizeof(ti));
+
+        stat = cdrom_get_toc_entry (drive, ti.cdti_trk0, &first_toc, NULL);
+        if (stat) return stat;
+        stat = cdrom_get_toc_entry (drive, ti.cdti_trk1, &last_toc, NULL);
+        if (stat) return stat;
+
+        if (ti.cdti_trk1 != CDROM_LEADOUT) ++last_toc;
+        lba_start = first_toc->addr.lba;
+        lba_end   = last_toc->addr.lba;
+
+        if (lba_end <= lba_start) return -EINVAL;
+
+        return cdrom_play_lba_range (drive, lba_start, lba_end, NULL);
+      }
+
+    case CDROMREADTOCHDR:
+      {
+        int stat;
+        struct cdrom_tochdr tochdr;
+        struct atapi_toc *toc;
+
+        stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (tochdr));
+        if (stat) return stat;
+
+        /* Make sure our saved TOC is valid. */
+        stat = cdrom_read_toc (drive, NULL);
+        if (stat) return stat;
+
+        toc = drive->cdrom_info.toc;
+        tochdr.cdth_trk0 = toc->hdr.first_track;
+        tochdr.cdth_trk1 = toc->hdr.last_track;
+
+        memcpy_tofs ((void *) arg, &tochdr, sizeof (tochdr));
+
+        return stat;
+      }
+
+    case CDROMREADTOCENTRY:
+      {
+        int stat;
+        struct cdrom_tocentry tocentry;
+        struct atapi_toc_entry *toce;
+
+        stat = verify_area (VERIFY_READ, (void *) arg, sizeof (tocentry));
+        if (stat) return stat;
+        stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (tocentry));
+        if (stat) return stat;
+
+        memcpy_fromfs (&tocentry, (void *) arg, sizeof (tocentry));
+
+        stat = cdrom_get_toc_entry (drive, tocentry.cdte_track, &toce, NULL);
+        if (stat) return stat;
+
+        tocentry.cdte_ctrl = toce->control;
+        tocentry.cdte_adr  = toce->adr;
+
+        if (tocentry.cdte_format == CDROM_MSF)
+          {
+            /* convert to MSF */
+            lba_to_msf (toce->addr.lba,
+                        &tocentry.cdte_addr.msf.minute,
+                        &tocentry.cdte_addr.msf.second,
+                        &tocentry.cdte_addr.msf.frame);
+          }
+        else
+          tocentry.cdte_addr.lba = toce->addr.lba;
+
+        memcpy_tofs ((void *) arg, &tocentry, sizeof (tocentry));
+
+        return stat;
+      }
+
+    case CDROMSUBCHNL:
+      {
+        struct atapi_cdrom_subchnl scbuf;
+        int stat, abs_lba, rel_lba;
+        struct cdrom_subchnl subchnl;
+
+        stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (subchnl));
+        if (stat) return stat;
+        stat = verify_area (VERIFY_READ, (void *) arg, sizeof (subchnl));
+        if (stat) return stat;
+
+        memcpy_fromfs (&subchnl, (void *) arg, sizeof (subchnl));
+
+        stat = cdrom_read_subchannel (drive, (char *)&scbuf, sizeof (scbuf),
+				      NULL);
+        if (stat) return stat;
+
+#if ! STANDARD_ATAPI
+	if (CDROM_CONFIG_FLAGS (drive)->vertos_lossage)
+	  {
+	    abs_lba = msf_to_lba (bcd2bin (scbuf.acdsc_absaddr.msf.minute),
+				  bcd2bin (scbuf.acdsc_absaddr.msf.second),
+				  bcd2bin (scbuf.acdsc_absaddr.msf.frame));
+	    rel_lba = msf_to_lba (bcd2bin (scbuf.acdsc_reladdr.msf.minute),
+				  bcd2bin (scbuf.acdsc_reladdr.msf.second),
+				  bcd2bin (scbuf.acdsc_reladdr.msf.frame));
+	    scbuf.acdsc_trk = bcd2bin (scbuf.acdsc_trk);
+	  }
+	else
+#endif /* not STANDARD_ATAPI */
+	  {
+	    abs_lba = ntohl (scbuf.acdsc_absaddr.lba);
+	    rel_lba = ntohl (scbuf.acdsc_reladdr.lba);
+	  }
+
+        if (subchnl.cdsc_format == CDROM_MSF)
+          {
+            lba_to_msf (abs_lba,
+                        &subchnl.cdsc_absaddr.msf.minute,
+                        &subchnl.cdsc_absaddr.msf.second,
+                        &subchnl.cdsc_absaddr.msf.frame);
+            lba_to_msf (rel_lba,
+                        &subchnl.cdsc_reladdr.msf.minute,
+                        &subchnl.cdsc_reladdr.msf.second,
+                        &subchnl.cdsc_reladdr.msf.frame);
+          }
+        else
+          {
+            subchnl.cdsc_absaddr.lba = abs_lba;
+            subchnl.cdsc_reladdr.lba = rel_lba;
+          }
+
+        subchnl.cdsc_audiostatus = scbuf.acdsc_audiostatus;
+        subchnl.cdsc_ctrl = scbuf.acdsc_ctrl;
+        subchnl.cdsc_trk  = scbuf.acdsc_trk;
+        subchnl.cdsc_ind  = scbuf.acdsc_ind;
+
+        memcpy_tofs ((void *) arg, &subchnl, sizeof (subchnl));
+
+        return stat;
+      }
+
+    case CDROMVOLCTRL:
+      {
+        struct cdrom_volctrl volctrl;
+        char buffer[24], mask[24];
+        int stat;
+
+        stat = verify_area (VERIFY_READ, (void *) arg, sizeof (volctrl));
+        if (stat) return stat;
+        memcpy_fromfs (&volctrl, (void *) arg, sizeof (volctrl));
+
+        stat = cdrom_mode_sense (drive, 0x0e, 0, buffer, sizeof (buffer),NULL);
+        if (stat) return stat;
+        stat = cdrom_mode_sense (drive, 0x0e, 1, mask  , sizeof (buffer),NULL);
+        if (stat) return stat;
+
+        buffer[1] = buffer[2] = 0;
+
+        buffer[17] = volctrl.channel0 & mask[17];
+        buffer[19] = volctrl.channel1 & mask[19];
+        buffer[21] = volctrl.channel2 & mask[21];
+        buffer[23] = volctrl.channel3 & mask[23];
+
+        return cdrom_mode_select (drive, 0x0e, buffer, sizeof (buffer), NULL);
+      }
+
+    case CDROMVOLREAD:
+      {
+        struct cdrom_volctrl volctrl;
+        char buffer[24];
+        int stat;
+
+        stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (volctrl));
+        if (stat) return stat;
+
+        stat = cdrom_mode_sense (drive, 0x0e, 0, buffer, sizeof (buffer), NULL);
+        if (stat) return stat;
+
+        volctrl.channel0 = buffer[17];
+        volctrl.channel1 = buffer[19];
+        volctrl.channel2 = buffer[21];
+        volctrl.channel3 = buffer[23];
+
+        memcpy_tofs ((void *) arg, &volctrl, sizeof (volctrl));
+
+	return 0;
+      }
+
+    case CDROMMULTISESSION:
+      {
+	struct cdrom_multisession ms_info;
+	struct atapi_toc *toc;
+	int stat;
+
+	stat = verify_area (VERIFY_READ,  (void *)arg, sizeof (ms_info));
+        if (stat) return stat;
+	stat = verify_area (VERIFY_WRITE, (void *)arg, sizeof (ms_info));
+        if (stat) return stat;
+
+	memcpy_fromfs (&ms_info, (void *)arg, sizeof (ms_info));
+
+	/* Make sure the TOC information is valid. */
+	stat = cdrom_read_toc (drive, NULL);
+	if (stat) return stat;
+
+	toc = drive->cdrom_info.toc;
+
+	if (ms_info.addr_format == CDROM_MSF)
+	  lba_to_msf (toc->last_session_lba,
+		      &ms_info.addr.msf.minute,
+		      &ms_info.addr.msf.second,
+		      &ms_info.addr.msf.frame);
+
+	else if (ms_info.addr_format == CDROM_LBA)
+	  ms_info.addr.lba = toc->last_session_lba;
+
+	else
+	  return -EINVAL;
+
+	ms_info.xa_flag = toc->xa_flag;
+
+	memcpy_tofs ((void *)arg, &ms_info, sizeof (ms_info));
+
+	return 0;
+      }
+
+    /* Read 2352 byte blocks from audio tracks. */
+    case CDROMREADAUDIO:
+      {
+	int stat, lba;
+	struct atapi_toc *toc;
+	struct cdrom_read_audio ra;
+	char buf[CD_FRAMESIZE_RAW];
+
+	/* Make sure the TOC is up to date. */
+	stat = cdrom_read_toc (drive, NULL);
+	if (stat) return stat;
+
+	toc = drive->cdrom_info.toc;
+
+	stat = verify_area (VERIFY_READ, (char *)arg, sizeof (ra));
+	if (stat) return stat;
+
+	memcpy_fromfs (&ra, (void *)arg, sizeof (ra));
+
+	if (ra.nframes < 0 || ra.nframes > toc->capacity)
+	  return -EINVAL;
+	else if (ra.nframes == 0)
+	  return 0;
+
+	stat = verify_area (VERIFY_WRITE, (char *)ra.buf,
+			                  ra.nframes * CD_FRAMESIZE_RAW);
+	if (stat) return stat;
+
+	if (ra.addr_format == CDROM_MSF)
+	  lba = msf_to_lba (ra.addr.msf.minute, ra.addr.msf.second,
+			    ra.addr.msf.frame);
+	
+	else if (ra.addr_format == CDROM_LBA)
+	  lba = ra.addr.lba;
+
+	else
+	  return -EINVAL;
+
+	if (lba < 0 || lba >= toc->capacity)
+	  return -EINVAL;
+
+	while (ra.nframes > 0)
+	  {
+	    stat = cdrom_read_block (drive, 1, lba, buf,
+				     CD_FRAMESIZE_RAW, NULL);
+	    if (stat) return stat;
+	    memcpy_tofs (ra.buf, buf, CD_FRAMESIZE_RAW);
+	    ra.buf += CD_FRAMESIZE_RAW;
+	    --ra.nframes;
+	    ++lba;
+	  }
+
+	return 0;
+      }
+
+    case CDROMREADMODE1:
+    case CDROMREADMODE2:
+      {
+	struct cdrom_msf msf;
+	int blocksize, format, stat, lba;
+	struct atapi_toc *toc;
+	char buf[CD_FRAMESIZE_RAW0];
+
+	if (cmd == CDROMREADMODE1)
+	  {
+	    blocksize = CD_FRAMESIZE;
+	    format = 2;
+	  }
+	else
+	  {
+	    blocksize = CD_FRAMESIZE_RAW0;
+	    format = 3;
+	  }
+
+	stat = verify_area (VERIFY_READ, (char *)arg, sizeof (msf));
+	if (stat) return stat;
+	stat = verify_area (VERIFY_WRITE, (char *)arg, blocksize);
+	if (stat) return stat;
+
+	memcpy_fromfs (&msf, (void *)arg, sizeof (msf));
+
+	lba = msf_to_lba (msf.cdmsf_min0, msf.cdmsf_sec0, msf.cdmsf_frame0);
+	
+	/* Make sure the TOC is up to date. */
+	stat = cdrom_read_toc (drive, NULL);
+	if (stat) return stat;
+
+	toc = drive->cdrom_info.toc;
+
+	if (lba < 0 || lba >= toc->capacity)
+	  return -EINVAL;
+
+	stat = cdrom_read_block (drive, format, lba, buf, blocksize, NULL);
+	if (stat) return stat;
+
+	memcpy_tofs ((char *)arg, buf, blocksize);
+	return 0;
+      }
+
+#if 0 /* Doesn't work reliably yet. */
+    case CDROMRESET:
+      {
+	struct request req;
+	ide_init_drive_cmd (&req);
+	req.cmd = RESET_DRIVE_COMMAND;
+	return ide_do_drive_cmd (drive, &req, ide_wait);
+      }
+#endif
+
+ 
+#ifdef TEST
+    case 0x1234:
+      {
+        int stat;
+        struct packet_command pc;
+	int len, lena;
+
+        memset (&pc, 0, sizeof (pc));
+
+        stat = verify_area (VERIFY_READ, (void *) arg, sizeof (pc.c));
+        if (stat) return stat;
+        memcpy_fromfs (&pc.c, (void *) arg, sizeof (pc.c));
+	arg += sizeof (pc.c);
+
+	stat = verify_area (VERIFY_READ, (void *) arg, sizeof (len));
+        if (stat) return stat;
+        memcpy_fromfs (&len, (void *) arg , sizeof (len));
+	arg += sizeof (len);
+
+	if (len > 0) {
+	  stat = verify_area (VERIFY_WRITE, (void *) arg, len);
+	  if (stat) return stat;
+	}
+
+	lena = len;
+	if (lena  < 0) lena = 0;
+
+	{
+	  char buf[lena];
+	  if (len > 0) {
+	    pc.buflen = len;
+	    pc.buffer = buf;
+	  }
+
+	  stat = cdrom_queue_packet_command (drive, &pc);
+
+	  if (len > 0)
+	    memcpy_tofs ((void *)arg, buf, len);
+	}
+
+        return stat;
+      }
+#endif
+
+    default:
+      return -EPERM;
+    }
+
+}
+
+
+
+/****************************************************************************
+ * Other driver requests (open, close, check media change).
+ */
+
+int ide_cdrom_check_media_change (ide_drive_t *drive)
+{
+  int retval;
+
+  (void) cdrom_check_status (drive, NULL);
+
+  retval = CDROM_STATE_FLAGS (drive)->media_changed;
+  CDROM_STATE_FLAGS (drive)->media_changed = 0;
+
+  return retval;
+}
+
+
+int ide_cdrom_open (struct inode *ip, struct file *fp, ide_drive_t *drive)
+{
+  /* no write access */
+  if (fp->f_mode & 2)
+    {
+      --drive->usage;
+      return -EROFS;
+    }
+
+  /* If this is the first open, check the drive status. */
+  if (drive->usage == 1)
+    {
+      int stat;
+      struct atapi_request_sense my_reqbuf;
+      my_reqbuf.sense_key = 0;
+
+      /* Get the drive status. */
+      stat = cdrom_check_status (drive, &my_reqbuf);
+
+      /* If the tray is open, try to close it. */
+      if (stat && my_reqbuf.sense_key == NOT_READY)
+	{
+	  cdrom_eject (drive, 1, &my_reqbuf);
+	  stat = cdrom_check_status (drive, &my_reqbuf);
+	}
+
+      /* Return an error if there are still problems. */
+      if (stat && my_reqbuf.sense_key != UNIT_ATTENTION)
+	{
+	  --drive->usage;
+	  return -ENXIO;
+	}
+
+      /* Now lock the door. */
+      (void) cdrom_lockdoor (drive, 1, &my_reqbuf);
+
+      /* And try to read the TOC information now. */
+      (void) cdrom_read_toc (drive, &my_reqbuf);
+    }
+
+  return 0;
+}
+
+
+/*
+ * Close down the device.  Invalidate all cached blocks.
+ */
+
+void ide_cdrom_release (struct inode *inode, struct file *file, ide_drive_t *drive)
+{
+  if (drive->usage == 0)
+    {
+      invalidate_buffers (inode->i_rdev);
+
+      /* Unlock the door. */
+      (void) cdrom_lockdoor (drive, 0, NULL);
+
+      /* Do an eject if we were requested to do so. */
+      if (CDROM_STATE_FLAGS (drive)->eject_on_close)
+	(void) cdrom_eject (drive, 0, NULL);
+    }
+}
+
+
+
+/****************************************************************************
+ * Device initialization.
+ */
+
+void ide_cdrom_setup (ide_drive_t *drive)
+{
+  blksize_size[HWIF(drive)->major][drive->select.b.unit << PARTN_BITS] = CD_FRAMESIZE;
+
+  drive->special.all = 0;
+  drive->ready_stat = 0;
+
+  CDROM_STATE_FLAGS (drive)->media_changed = 0;
+  CDROM_STATE_FLAGS (drive)->toc_valid     = 0;
+  CDROM_STATE_FLAGS (drive)->door_locked   = 0;
+
+  /* Turn this off by default, since many people don't like it. */
+  CDROM_STATE_FLAGS (drive)->eject_on_close= 0;
+
+#if NO_DOOR_LOCKING
+  CDROM_CONFIG_FLAGS (drive)->no_doorlock = 1;
+#else
+  CDROM_CONFIG_FLAGS (drive)->no_doorlock = 0;
+#endif
+
+  if (drive->id != NULL) {
+    CDROM_CONFIG_FLAGS (drive)->drq_interrupt =
+      ((drive->id->config & 0x0060) == 0x20);
+  } else {
+    CDROM_CONFIG_FLAGS (drive)->drq_interrupt = 0;
+  }
+
+#if ! STANDARD_ATAPI
+  CDROM_CONFIG_FLAGS (drive)->no_playaudio12 = 0;
+  CDROM_CONFIG_FLAGS (drive)->old_readcd = 0;
+  CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 0;
+  CDROM_CONFIG_FLAGS (drive)->playmsf_uses_bcd = 0;
+  CDROM_CONFIG_FLAGS (drive)->vertos_lossage = 0;
+
+  if (drive->id != NULL) {
+    /* Accommodate some broken drives... */
+    if (strcmp (drive->id->model, "CD220E") == 0 ||
+        strcmp (drive->id->model, "CD")     == 0)        /* Creative Labs */
+      CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+
+    else if (strcmp (drive->id->model, "TO-ICSLYAL") == 0 ||  /* Acer CD525E */
+             strcmp (drive->id->model, "OTI-SCYLLA") == 0)
+      CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+
+    /* I don't know who makes this.
+       Francesco Messineo <sidera@ccii.unipi.it> says this one's broken too. */
+    else if (strcmp (drive->id->model, "DCI-2S10") == 0)
+      CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+
+    else if (strcmp (drive->id->model, "CDA26803I SE") == 0) /* Aztech */
+      {
+        CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+
+        /* This drive _also_ does not implement PLAYAUDIO12 correctly. */
+        CDROM_CONFIG_FLAGS (drive)->no_playaudio12 = 1;
+      }
+
+    /* Vertos 300.
+       There seem to be at least two different, incompatible versions
+       of this drive floating around.  Luckily, they appear to return their
+       id strings with different byte orderings. */
+    else if (strcmp (drive->id->model, "V003S0DS") == 0)
+      {
+        CDROM_CONFIG_FLAGS (drive)->vertos_lossage = 1;
+        CDROM_CONFIG_FLAGS (drive)->playmsf_uses_bcd = 1;
+        CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+      }
+    else if (strcmp (drive->id->model, "0V300SSD") == 0 ||
+  	   strcmp (drive->id->model, "V003M0DP") == 0)
+      CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+
+    /* Vertos 400. */
+    else if (strcmp (drive->id->model, "V004E0DT") == 0 ||
+  	   strcmp (drive->id->model, "0V400ETD") == 0)
+      CDROM_CONFIG_FLAGS (drive)->no_lba_toc = 1;
+
+    else if ( strcmp (drive->id->model, "CD-ROM CDU55D") == 0) /*sony cdu55d */
+      CDROM_CONFIG_FLAGS (drive)->no_playaudio12 = 1;
+
+   else if (strcmp (drive->id->model, "CD-ROM CDU55E") == 0)
+  	CDROM_CONFIG_FLAGS (drive)->no_playaudio12 = 1;
+  } /* drive-id != NULL */
+#endif  /* not STANDARD_ATAPI */
+
+  drive->cdrom_info.toc               = NULL;
+  drive->cdrom_info.sector_buffer     = NULL;
+  drive->cdrom_info.sector_buffered   = 0;
+  drive->cdrom_info.nsectors_buffered = 0;
+}
+
+
+
+/*
+ * TODO:
+ *  CDROM_GET_UPC
+ *  CDROMRESET
+ *  Lock the door when a read request completes successfully and the
+ *   door is not already locked.  Also try to reorganize to reduce
+ *   duplicated functionality between read and ioctl paths?
+ *  Establish interfaces for an IDE port driver, and break out the cdrom
+ *   code into a loadable module.
+ *  Support changers.
+ *  Write some real documentation.
+ */
diff --git a/i386/i386at/gpl/linux/block/ide.c b/i386/i386at/gpl/linux/block/ide.c
new file mode 100644
index 0000000..4b7c5e9
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/ide.c
@@ -0,0 +1,3087 @@
+/*
+ *  linux/drivers/block/ide.c	Version 5.28  Feb 11, 1996
+ *
+ *  Copyright (C) 1994-1996  Linus Torvalds & authors (see below)
+ */
+#define _IDE_C		/* needed by <linux/blk.h> */
+
+/*
+ * This is the multiple IDE interface driver, as evolved from hd.c.
+ * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
+ * There can be up to two drives per interface, as per the ATA-2 spec.
+ *
+ * Primary i/f:    ide0: major=3;  (hda)         minor=0; (hdb)         minor=64
+ * Secondary i/f:  ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
+ * Tertiary i/f:   ide2: major=33; (hde)         minor=0; (hdf)         minor=64
+ * Quaternary i/f: ide3: major=34; (hdg)         minor=0; (hdh)         minor=64
+ *
+ * It is easy to extend ide.c to handle more than four interfaces:
+ *
+ *	Change the MAX_HWIFS constant in ide.h.
+ *
+ *	Define some new major numbers (in major.h), and insert them into
+ *	the ide_hwif_to_major table in ide.c.
+ *
+ *	Fill in the extra values for the new interfaces into the two tables
+ *	inside ide.c:  default_io_base[]  and  default_irqs[].
+ *
+ *	Create the new request handlers by cloning "do_ide3_request()"
+ *	for each new interface, and add them to the switch statement
+ *	in the ide_init() function in ide.c.
+ *
+ *	Recompile, create the new /dev/ entries, and it will probably work.
+ *
+ *  From hd.c:
+ *  |
+ *  | It traverses the request-list, using interrupts to jump between functions.
+ *  | As nearly all functions can be called within interrupts, we may not sleep.
+ *  | Special care is recommended.  Have Fun!
+ *  |
+ *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
+ *  |
+ *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ *  | in the early extended-partition checks and added DM partitions.
+ *  |
+ *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
+ *  |
+ *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
+ *  | and general streamlining by Mark Lord (mlord@bnr.ca).
+ *
+ *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
+ *
+ *	Mark Lord	(mlord@bnr.ca)			(IDE Perf.Pkg)
+ *	Delman Lee	(delman@mipg.upenn.edu)		("Mr. atdisk2")
+ *	Petri Mattila	(ptjmatti@kruuna.helsinki.fi)	(EIDE stuff)
+ *	Scott Snyder	(snyder@fnald0.fnal.gov)	(ATAPI IDE cd-rom)
+ *
+ *  Maintained by Mark Lord (mlord@bnr.ca):  ide.c, ide.h, triton.c, hd.c, ..
+ *
+ *  This was a rewrite of just about everything from hd.c, though some original
+ *  code is still sprinkled about.  Think of it as a major evolution, with
+ *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
+ *
+ *  Version 1.0 ALPHA	initial code, primary i/f working okay
+ *  Version 1.3 BETA	dual i/f on shared irq tested & working!
+ *  Version 1.4 BETA	added auto probing for irq(s)
+ *  Version 1.5 BETA	added ALPHA (untested) support for IDE cd-roms,
+ *  ...
+ *  Version 3.5		correct the bios_cyl field if it's too small
+ *  (linux 1.1.76)	 (to help fdisk with brain-dead BIOSs)
+ *  Version 3.6		cosmetic corrections to comments and stuff
+ *  (linux 1.1.77)	reorganise probing code to make it understandable
+ *			added halfway retry to probing for drive identification
+ *			added "hdx=noprobe" command line option
+ *			allow setting multmode even when identification fails
+ *  Version 3.7		move set_geometry=1 from do_identify() to ide_init()
+ *			increase DRQ_WAIT to eliminate nuisance messages
+ *			wait for DRQ_STAT instead of DATA_READY during probing
+ *			  (courtesy of Gary Thomas gary@efland.UU.NET)
+ *  Version 3.8		fixed byte-swapping for confused Mitsumi cdrom drives
+ *			update of ide-cd.c from Scott, allows blocksize=1024
+ *			cdrom probe fixes, inspired by jprang@uni-duisburg.de
+ *  Version 3.9		don't use LBA if lba_capacity looks funny
+ *			correct the drive capacity calculations
+ *			fix probing for old Seagates without IDE_ALTSTATUS_REG
+ *			fix byte-ordering for some NEC cdrom drives
+ *  Version 3.10	disable multiple mode by default; was causing trouble
+ *  Version 3.11	fix mis-identification of old WD disks as cdroms
+ *  Version 3,12	simplify logic for selecting initial mult_count
+ *			  (fixes problems with buggy WD drives)
+ *  Version 3.13	remove excess "multiple mode disabled" messages
+ *  Version 3.14	fix ide_error() handling of BUSY_STAT
+ *			fix byte-swapped cdrom strings (again.. arghh!)
+ *			ignore INDEX bit when checking the ALTSTATUS reg
+ *  Version 3.15	add SINGLE_THREADED flag for use with dual-CMD i/f
+ *			ignore WRERR_STAT for non-write operations
+ *			added vlb_sync support for DC-2000A & others,
+ *			 (incl. some Promise chips), courtesy of Frank Gockel
+ *  Version 3.16	convert vlb_32bit and vlb_sync into runtime flags
+ *			add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
+ *			rename SINGLE_THREADED to SUPPORT_SERIALIZE,
+ *			add boot flag to "serialize" operation for CMD i/f
+ *			add optional support for DTC2278 interfaces,
+ *			 courtesy of andy@cercle.cts.com (Dyan Wile).
+ *			add boot flag to enable "dtc2278" probe
+ *			add probe to avoid EATA (SCSI) interfaces,
+ *			 courtesy of neuffer@goofy.zdv.uni-mainz.de.
+ *  Version 4.00	tidy up verify_area() calls - heiko@colossus.escape.de
+ *			add flag to ignore WRERR_STAT for some drives
+ *			 courtesy of David.H.West@um.cc.umich.edu
+ *			assembly syntax tweak to vlb_sync
+ *			removeable drive support from scuba@cs.tu-berlin.de
+ *			add transparent support for DiskManager-6.0x "Dynamic
+ *			 Disk Overlay" (DDO), most of this is in genhd.c
+ *			eliminate "multiple mode turned off" message at boot
+ *  Version 4.10	fix bug in ioctl for "hdparm -c3"
+ *			fix DM6:DDO support -- now works with LILO, fdisk, ...
+ *			don't treat some naughty WD drives as removeable
+ *  Version 4.11	updated DM6 support using info provided by OnTrack
+ *  Version 5.00	major overhaul, multmode setting fixed, vlb_sync fixed
+ *			added support for 3rd/4th/alternative IDE ports
+ *			created ide.h; ide-cd.c now compiles separate from ide.c
+ *			hopefully fixed infinite "unexpected_intr" from cdroms
+ *			zillions of other changes and restructuring
+ *			somehow reduced overall memory usage by several kB
+ *			probably slowed things down slightly, but worth it
+ *  Version 5.01	AT LAST!!  Finally understood why "unexpected_intr"
+ *			 was happening at various times/places:  whenever the
+ *			 ide-interface's ctl_port was used to "mask" the irq,
+ *			 it also would trigger an edge in the process of masking
+ *			 which would result in a self-inflicted interrupt!!
+ *			 (such a stupid way to build a hardware interrupt mask).
+ *			 This is now fixed (after a year of head-scratching).
+ *  Version 5.02	got rid of need for {enable,disable}_irq_list()
+ *  Version 5.03	tune-ups, comments, remove "busy wait" from drive resets
+ *			removed PROBE_FOR_IRQS option -- no longer needed
+ *			OOOPS!  fixed "bad access" bug for 2nd drive on an i/f
+ *  Version 5.04	changed "ira %d" to "irq %d" in DEBUG message
+ *			added more comments, cleaned up unexpected_intr()
+ *			OOOPS!  fixed null pointer problem in ide reset code
+ *			added autodetect for Triton chipset -- no effect yet
+ *  Version 5.05	OOOPS!  fixed bug in revalidate_disk()
+ *			OOOPS!  fixed bug in ide_do_request()
+ *			added ATAPI reset sequence for cdroms
+ *  Version 5.10	added Bus-Mastered DMA support for Triton Chipset
+ *			some (mostly) cosmetic changes
+ *  Version 5.11	added ht6560b support by malafoss@snakemail.hut.fi
+ *			reworked PCI scanning code
+ *			added automatic RZ1000 detection/support
+ *			added automatic PCI CMD640 detection/support
+ *			added option for VLB CMD640 support
+ *			tweaked probe to find cdrom on hdb with disks on hda,hdc
+ *  Version 5.12	some performance tuning
+ *			added message to alert user to bad /dev/hd[cd] entries
+ *			OOOPS!  fixed bug in atapi reset
+ *			driver now forces "serialize" again for all cmd640 chips
+ *			noticed REALLY_SLOW_IO had no effect, moved it to ide.c
+ *			made do_drive_cmd() into public ide_do_drive_cmd()
+ *  Version 5.13	fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
+ *			fixed ht6560b support
+ *  Version 5.13b (sss)	fix problem in calling ide_cdrom_setup()
+ *			don't bother invalidating nonexistent partitions
+ *  Version 5.14	fixes to cmd640 support.. maybe it works now(?)
+ *			added & tested full EZ-DRIVE support -- don't use LILO!
+ *			don't enable 2nd CMD640 PCI port during init - conflict
+ *  Version 5.15	bug fix in init_cmd640_vlb()
+ *			bug fix in interrupt sharing code
+ *  Version 5.16	ugh.. fix "serialize" support, broken in 5.15
+ *			remove "Huh?" from cmd640 code
+ *			added qd6580 interface speed select from Colten Edwards
+ *  Version 5.17	kludge around bug in BIOS32 on Intel triton motherboards
+ *  Version 5.18	new CMD640 code, moved to cmd640.c, #include'd for now
+ *			new UMC8672 code, moved to umc8672.c, #include'd for now
+ *			disallow turning on DMA when h/w not capable of DMA
+ *  Version 5.19	fix potential infinite timeout on resets
+ *			extend reset poll into a general purpose polling scheme
+ *			add atapi tape drive support from Gadi Oxman
+ *			simplify exit from _intr routines -- no IDE_DO_REQUEST
+ *  Version 5.20	leave current rq on blkdev request list during I/O
+ *			generalized ide_do_drive_cmd() for tape/cdrom driver use
+ *  Version 5.21	fix nasty cdrom/tape bug (ide_preempt was messed up)
+ *  Version 5.22	fix ide_xlate_1024() to work with/without drive->id
+ *  Version 5.23	miscellaneous touch-ups
+ *  Version 5.24	fix #if's for SUPPORT_CMD640
+ *  Version 5.25	more touch-ups, fix cdrom resets, ...
+ *			cmd640.c now configs/compiles separate from ide.c
+ *  Version 5.26	keep_settings now maintains the using_dma flag
+ *			fix [EZD] remap message to only output at boot time
+ *			fix "bad /dev/ entry" message to say hdc, not hdc0
+ *			fix ide_xlate_1024() to respect user specified CHS
+ *			use CHS from partn table if it looks translated
+ *			re-merged flags chipset,vlb_32bit,vlb_sync into io_32bit
+ *			keep track of interface chipset type, when known
+ *			add generic PIO mode "tuneproc" mechanism
+ *			fix cmd640_vlb option
+ *			fix ht6560b support (was completely broken)
+ *			umc8672.c now configures/compiles separate from ide.c
+ *			move dtc2278 support to dtc2278.c
+ *			move ht6560b support to ht6560b.c
+ *			move qd6580  support to qd6580.c
+ *			add  ali14xx support in ali14xx.c
+ * Version 5.27		add [no]autotune parameters to help cmd640
+ *			move rz1000  support to rz1000.c
+ * Version 5.28		#include "ide_modes.h"
+ *			fix disallow_unmask: now per-interface "no_unmask" bit
+ *			force io_32bit to be the same on drive pairs of dtc2278
+ *			improved IDE tape error handling, and tape DMA support
+ *			bugfix in ide_do_drive_cmd() for cdroms + serialize
+ *
+ *  Some additional driver compile-time options are in ide.h
+ *
+ *  To do, in likely order of completion:
+ *	- add Promise DC4030VL support from peterd@pnd-pc.demon.co.uk
+ *	- modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
+*/
+
+#if defined (MACH) && !defined (LINUX_IDE_DEBUG)
+#undef DEBUG
+#endif
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/blkdev.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/genhd.h>
+#include <linux/malloc.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/segment.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_PCI
+#include <linux/bios32.h>
+#include <linux/pci.h>
+#endif /* CONFIG_PCI */
+
+#include "ide.h"
+#include "ide_modes.h"
+
+static ide_hwgroup_t	*irq_to_hwgroup [NR_IRQS];
+static const byte	ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
+
+static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
+static const byte	default_irqs[MAX_HWIFS]     = {14, 15, 11, 10};
+
+#if (DISK_RECOVERY_TIME > 0)
+/*
+ * For really screwy hardware (hey, at least it *can* be used with Linux)
+ * we can enforce a minimum delay time between successive operations.
+ */
+static unsigned long read_timer(void)
+{
+	unsigned long t, flags;
+	int i;
+
+	save_flags(flags);
+	cli();
+	t = jiffies * 11932;
+    	outb_p(0, 0x43);
+	i = inb_p(0x40);
+	i |= inb(0x40) << 8;
+	restore_flags(flags);
+	return (t - i);
+}
+
+static void set_recovery_timer (ide_hwif_t *hwif)
+{
+	hwif->last_time = read_timer();
+}
+#define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
+
+#else
+
+#define SET_RECOVERY_TIMER(drive)
+
+#endif /* DISK_RECOVERY_TIME */
+
+/*
+ * init_ide_data() sets reasonable default values into all fields
+ * of all instances of the hwifs and drives, but only on the first call.
+ * Subsequent calls have no effect (they don't wipe out anything).
+ *
+ * This routine is normally called at driver initialization time,
+ * but may also be called MUCH earlier during kernel "command-line"
+ * parameter processing.  As such, we cannot depend on any other parts
+ * of the kernel (such as memory allocation) to be functioning yet.
+ *
+ * This is too bad, as otherwise we could dynamically allocate the
+ * ide_drive_t structs as needed, rather than always consuming memory
+ * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
+ */
+#define MAGIC_COOKIE 0x12345678
+static void init_ide_data (void)
+{
+	byte *p;
+	unsigned int h, unit;
+	static unsigned long magic_cookie = MAGIC_COOKIE;
+
+	if (magic_cookie != MAGIC_COOKIE)
+		return;		/* already initialized */
+	magic_cookie = 0;
+
+	for (h = 0; h < NR_IRQS; ++h)
+		 irq_to_hwgroup[h] = NULL;
+
+	/* bulk initialize hwif & drive info with zeros */
+	p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
+	do {
+		*--p = 0;
+	} while (p > (byte *) ide_hwifs);
+
+	/* fill in any non-zero initial values */
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		ide_hwif_t *hwif = &ide_hwifs[h];
+
+		hwif->index     = h;
+		hwif->noprobe	= (h > 1);
+		hwif->io_base	= default_io_base[h];
+		hwif->ctl_port	= hwif->io_base ? hwif->io_base+0x206 : 0x000;
+#ifdef CONFIG_BLK_DEV_HD
+		if (hwif->io_base == HD_DATA)
+			hwif->noprobe = 1; /* may be overriden by ide_setup() */
+#endif /* CONFIG_BLK_DEV_HD */
+		hwif->major	= ide_hwif_to_major[h];
+		hwif->name[0]	= 'i';
+		hwif->name[1]	= 'd';
+		hwif->name[2]	= 'e';
+		hwif->name[3]	= '0' + h;
+#ifdef CONFIG_BLK_DEV_IDETAPE
+		hwif->tape_drive = NULL;
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+		for (unit = 0; unit < MAX_DRIVES; ++unit) {
+			ide_drive_t *drive = &hwif->drives[unit];
+
+			drive->select.all		= (unit<<4)|0xa0;
+			drive->hwif			= hwif;
+			drive->ctl			= 0x08;
+			drive->ready_stat		= READY_STAT;
+			drive->bad_wstat		= BAD_W_STAT;
+			drive->special.b.recalibrate	= 1;
+			drive->special.b.set_geometry	= 1;
+			drive->name[0]			= 'h';
+			drive->name[1]			= 'd';
+			drive->name[2]			= 'a' + (h * MAX_DRIVES) + unit;
+		}
+	}
+}
+
+#if SUPPORT_VLB_SYNC
+/*
+ * Some localbus EIDE interfaces require a special access sequence
+ * when using 32-bit I/O instructions to transfer data.  We call this
+ * the "vlb_sync" sequence, which consists of three successive reads
+ * of the sector count register location, with interrupts disabled
+ * to ensure that the reads all happen together.
+ */
+static inline void do_vlb_sync (unsigned short port) {
+	(void) inb (port);
+	(void) inb (port);
+	(void) inb (port);
+}
+#endif /* SUPPORT_VLB_SYNC */
+
+/*
+ * This is used for most PIO data transfers *from* the IDE interface
+ */
+void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
+{
+	unsigned short io_base  = HWIF(drive)->io_base;
+	unsigned short data_reg = io_base+IDE_DATA_OFFSET;
+	byte io_32bit = drive->io_32bit;
+
+	if (io_32bit) {
+#if SUPPORT_VLB_SYNC
+		if (io_32bit & 2) {
+			cli();
+			do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
+			insl(data_reg, buffer, wcount);
+			if (drive->unmask)
+				sti();
+		} else
+#endif /* SUPPORT_VLB_SYNC */
+			insl(data_reg, buffer, wcount);
+	} else
+		insw(data_reg, buffer, wcount<<1);
+}
+
+/*
+ * This is used for most PIO data transfers *to* the IDE interface
+ */
+void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
+{
+	unsigned short io_base  = HWIF(drive)->io_base;
+	unsigned short data_reg = io_base+IDE_DATA_OFFSET;
+	byte io_32bit = drive->io_32bit;
+
+	if (io_32bit) {
+#if SUPPORT_VLB_SYNC
+		if (io_32bit & 2) {
+			cli();
+			do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
+			outsl(data_reg, buffer, wcount);
+			if (drive->unmask)
+				sti();
+		} else
+#endif /* SUPPORT_VLB_SYNC */
+			outsl(data_reg, buffer, wcount);
+	} else
+		outsw(data_reg, buffer, wcount<<1);
+}
+
+/*
+ * This should get invoked any time we exit the driver to
+ * wait for an interrupt response from a drive.  handler() points
+ * at the appropriate code to handle the next interrupt, and a
+ * timer is started to prevent us from waiting forever in case
+ * something goes wrong (see the timer_expiry() handler later on).
+ */
+void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
+{
+	ide_hwgroup_t *hwgroup = HWGROUP(drive);
+#ifdef DEBUG
+	if (hwgroup->handler != NULL) {
+		printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
+			drive->name, hwgroup->handler, handler);
+	}
+#endif
+	hwgroup->handler       = handler;
+	hwgroup->timer.expires = jiffies + timeout;
+	add_timer(&(hwgroup->timer));
+}
+
+/*
+ * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
+ * value for this drive (from its reported identification information).
+ *
+ * Returns:	1 if lba_capacity looks sensible
+ *		0 otherwise
+ */
+static int lba_capacity_is_ok (struct hd_driveid *id)
+{
+	unsigned long lba_sects   = id->lba_capacity;
+	unsigned long chs_sects   = id->cyls * id->heads * id->sectors;
+	unsigned long _10_percent = chs_sects / 10;
+
+	/* perform a rough sanity check on lba_sects:  within 10% is "okay" */
+	if ((lba_sects - chs_sects) < _10_percent)
+		return 1;	/* lba_capacity is good */
+
+	/* some drives have the word order reversed */
+	lba_sects = (lba_sects << 16) | (lba_sects >> 16);
+	if ((lba_sects - chs_sects) < _10_percent) {
+		id->lba_capacity = lba_sects;	/* fix it */
+		return 1;	/* lba_capacity is (now) good */
+	}
+	return 0;	/* lba_capacity value is bad */
+}
+
+/*
+ * current_capacity() returns the capacity (in sectors) of a drive
+ * according to its current geometry/LBA settings.
+ */
+static unsigned long current_capacity (ide_drive_t  *drive)
+{
+	struct hd_driveid *id = drive->id;
+	unsigned long capacity;
+
+	if (!drive->present)
+		return 0;
+	if (drive->media != ide_disk)
+		return 0x7fffffff;	/* cdrom or tape */
+	/* Determine capacity, and use LBA if the drive properly supports it */
+	if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
+		drive->select.b.lba = 1;
+		capacity = id->lba_capacity;
+	} else {
+		drive->select.b.lba = 0;
+		capacity = drive->cyl * drive->head * drive->sect;
+	}
+	return (capacity - drive->sect0);
+}
+
+/*
+ * ide_geninit() is called exactly *once* for each major, from genhd.c,
+ * at the beginning of the initial partition check for the drives.
+ */
+static void ide_geninit (struct gendisk *gd)
+{
+	unsigned int unit;
+	ide_hwif_t *hwif = gd->real_devices;
+
+	for (unit = 0; unit < gd->nr_real; ++unit) {
+		ide_drive_t *drive = &hwif->drives[unit];
+#ifdef CONFIG_BLK_DEV_IDECD
+		if (drive->present && drive->media == ide_cdrom)
+			ide_cdrom_setup(drive);
+#endif /* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+		if (drive->present && drive->media == ide_tape)
+			idetape_setup(drive);
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+		drive->part[0].nr_sects = current_capacity(drive);
+		if (!drive->present || drive->media != ide_disk) {
+			drive->part[0].start_sect = -1; /* skip partition check */
+		}
+	}
+	/*
+	 * The partition check in genhd.c needs this string to identify
+	 * our minor devices by name for display purposes.
+	 * Note that doing this will prevent us from working correctly
+	 * if ever called a second time for this major (never happens).
+	 */
+	gd->real_devices = hwif->drives[0].name;  /* name of first drive */
+}
+
+/*
+ * init_gendisk() (as opposed to ide_geninit) is called for each major device,
+ * after probing for drives, to allocate partition tables and other data
+ * structures needed for the routines in genhd.c.  ide_geninit() gets called
+ * somewhat later, during the partition check.
+ */
+static void init_gendisk (ide_hwif_t *hwif)
+{
+	struct gendisk *gd;
+	unsigned int unit, units, minors;
+	int *bs;
+
+	/* figure out maximum drive number on the interface */
+	for (units = MAX_DRIVES; units > 0; --units) {
+		if (hwif->drives[units-1].present)
+			break;
+	}
+	minors    = units * (1<<PARTN_BITS);
+	gd        = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
+	gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
+	gd->part  = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
+	bs        = kmalloc (minors*sizeof(int), GFP_KERNEL);
+
+	/* cdroms and msdos f/s are examples of non-1024 blocksizes */
+	blksize_size[hwif->major] = bs;
+	for (unit = 0; unit < minors; ++unit)
+		*bs++ = BLOCK_SIZE;
+
+	for (unit = 0; unit < units; ++unit)
+		hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
+
+	gd->major	= hwif->major;		/* our major device number */
+	gd->major_name	= IDE_MAJOR_NAME;	/* treated special in genhd.c */
+	gd->minor_shift	= PARTN_BITS;		/* num bits for partitions */
+	gd->max_p	= 1<<PARTN_BITS;	/* 1 + max partitions / drive */
+	gd->max_nr	= units;		/* max num real drives */
+	gd->nr_real	= units;		/* current num real drives */
+	gd->init	= ide_geninit;		/* initialization function */
+	gd->real_devices= hwif;			/* ptr to internal data */
+
+	gd->next = gendisk_head;		/* link new major into list */
+	hwif->gd = gendisk_head = gd;
+}
+
+static void do_reset1 (ide_drive_t *, int);		/* needed below */
+
+#ifdef CONFIG_BLK_DEV_IDEATAPI
+/*
+ * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
+ * during an atapi drive reset operation. If the drive has not yet responded,
+ * and we have not yet hit our maximum waiting time, then the timer is restarted
+ * for another 50ms.
+ */
+static void atapi_reset_pollfunc (ide_drive_t *drive)
+{
+	ide_hwgroup_t *hwgroup = HWGROUP(drive);
+	byte stat;
+
+	OUT_BYTE (drive->select.all, IDE_SELECT_REG);
+	udelay (10);
+
+	if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
+		printk("%s: ATAPI reset complete\n", drive->name);
+	} else {
+		if (jiffies < hwgroup->poll_timeout) {
+			ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
+			return;	/* continue polling */
+		}
+		hwgroup->poll_timeout = 0;	/* end of polling */
+		printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
+		do_reset1 (drive, 1);	/* do it the old fashioned way */
+	}
+	hwgroup->poll_timeout = 0;	/* done polling */
+}
+#endif /* CONFIG_BLK_DEV_IDEATAPI */
+
+/*
+ * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
+ * during an ide reset operation. If the drives have not yet responded,
+ * and we have not yet hit our maximum waiting time, then the timer is restarted
+ * for another 50ms.
+ */
+static void reset_pollfunc (ide_drive_t *drive)
+{
+	ide_hwgroup_t *hwgroup = HWGROUP(drive);
+	ide_hwif_t *hwif = HWIF(drive);
+	byte tmp;
+
+	if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
+		if (jiffies < hwgroup->poll_timeout) {
+			ide_set_handler (drive, &reset_pollfunc, HZ/20);
+			return;	/* continue polling */
+		}
+		printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
+	} else  {
+		printk("%s: reset: ", hwif->name);
+		if ((tmp = GET_ERR()) == 1)
+			printk("success\n");
+		else {
+			printk("master: ");
+			switch (tmp & 0x7f) {
+				case 1: printk("passed");
+					break;
+				case 2: printk("formatter device error");
+					break;
+				case 3: printk("sector buffer error");
+					break;
+				case 4: printk("ECC circuitry error");
+					break;
+				case 5: printk("controlling MPU error");
+					break;
+				default:printk("error (0x%02x?)", tmp);
+			}
+			if (tmp & 0x80)
+				printk("; slave: failed");
+			printk("\n");
+		}
+	}
+	hwgroup->poll_timeout = 0;	/* done polling */
+}
+
+/*
+ * do_reset1() attempts to recover a confused drive by resetting it.
+ * Unfortunately, resetting a disk drive actually resets all devices on
+ * the same interface, so it can really be thought of as resetting the
+ * interface rather than resetting the drive.
+ *
+ * ATAPI devices have their own reset mechanism which allows them to be
+ * individually reset without clobbering other devices on the same interface.
+ *
+ * Unfortunately, the IDE interface does not generate an interrupt to let
+ * us know when the reset operation has finished, so we must poll for this.
+ * Equally poor, though, is the fact that this may a very long time to complete,
+ * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
+ * we set a timer to poll at 50ms intervals.
+ */
+static void do_reset1 (ide_drive_t *drive, int  do_not_try_atapi)
+{
+	unsigned int unit;
+	unsigned long flags;
+	ide_hwif_t *hwif = HWIF(drive);
+	ide_hwgroup_t *hwgroup = HWGROUP(drive);
+
+	save_flags(flags);
+	cli();		/* Why ? */
+
+#ifdef CONFIG_BLK_DEV_IDEATAPI
+	/* For an ATAPI device, first try an ATAPI SRST. */
+	if (drive->media != ide_disk) {
+		if (!do_not_try_atapi) {
+			if (!drive->keep_settings)
+				drive->unmask = 0;
+			OUT_BYTE (drive->select.all, IDE_SELECT_REG);
+			udelay (20);
+			OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
+			hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
+			ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
+			restore_flags (flags);
+			return;
+		}
+	}
+#endif /* CONFIG_BLK_DEV_IDEATAPI */
+
+	/*
+	 * First, reset any device state data we were maintaining
+	 * for any of the drives on this interface.
+	 */
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t *rdrive = &hwif->drives[unit];
+		rdrive->special.all = 0;
+		rdrive->special.b.set_geometry = 1;
+		rdrive->special.b.recalibrate  = 1;
+		if (OK_TO_RESET_CONTROLLER)
+			rdrive->mult_count = 0;
+		if (!rdrive->keep_settings) {
+			rdrive->using_dma = 0;
+			rdrive->mult_req = 0;
+			rdrive->unmask = 0;
+		}
+		if (rdrive->mult_req != rdrive->mult_count)
+			rdrive->special.b.set_multmode = 1;
+	}
+
+#if OK_TO_RESET_CONTROLLER
+	/*
+	 * Note that we also set nIEN while resetting the device,
+	 * to mask unwanted interrupts from the interface during the reset.
+	 * However, due to the design of PC hardware, this will cause an
+	 * immediate interrupt due to the edge transition it produces.
+	 * This single interrupt gives us a "fast poll" for drives that
+	 * recover from reset very quickly, saving us the first 50ms wait time.
+	 */
+	OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG);	/* set SRST and nIEN */
+	udelay(5);			/* more than enough time */
+	OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG);	/* clear SRST, leave nIEN */
+	hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
+	ide_set_handler (drive, &reset_pollfunc, HZ/20);
+#endif	/* OK_TO_RESET_CONTROLLER */
+
+	restore_flags (flags);
+}
+
+/*
+ * ide_do_reset() is the entry point to the drive/interface reset code.
+ */
+void ide_do_reset (ide_drive_t *drive)
+{
+	do_reset1 (drive, 0);
+#ifdef CONFIG_BLK_DEV_IDETAPE
+	if (drive->media == ide_tape)
+		drive->tape.reset_issued=1;
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+}
+
+/*
+ * Clean up after success/failure of an explicit drive cmd
+ */
+void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
+{
+	unsigned long flags;
+	struct request *rq = HWGROUP(drive)->rq;
+
+	if (rq->cmd == IDE_DRIVE_CMD) {
+		byte *args = (byte *) rq->buffer;
+		rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
+		if (args) {
+			args[0] = stat;
+			args[1] = err;
+			args[2] = IN_BYTE(IDE_NSECTOR_REG);
+		}
+	}
+	save_flags(flags);
+	cli();
+	blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
+	HWGROUP(drive)->rq = NULL;
+	rq->rq_status = RQ_INACTIVE;
+	if (rq->sem != NULL)
+		up(rq->sem);
+	restore_flags(flags);
+}
+
+/*
+ * Error reporting, in human readable form (luxurious, but a memory hog).
+ */
+byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
+{
+	unsigned long flags;
+	byte err = 0;
+
+	save_flags (flags);
+	sti();
+	printk("%s: %s: status=0x%02x", drive->name, msg, stat);
+#if FANCY_STATUS_DUMPS
+	if (drive->media == ide_disk) {
+		printk(" { ");
+		if (stat & BUSY_STAT)
+			printk("Busy ");
+		else {
+			if (stat & READY_STAT)	printk("DriveReady ");
+			if (stat & WRERR_STAT)	printk("DeviceFault ");
+			if (stat & SEEK_STAT)	printk("SeekComplete ");
+			if (stat & DRQ_STAT)	printk("DataRequest ");
+			if (stat & ECC_STAT)	printk("CorrectedError ");
+			if (stat & INDEX_STAT)	printk("Index ");
+			if (stat & ERR_STAT)	printk("Error ");
+		}
+		printk("}");
+	}
+#endif	/* FANCY_STATUS_DUMPS */
+	printk("\n");
+	if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
+		err = GET_ERR();
+		printk("%s: %s: error=0x%02x", drive->name, msg, err);
+#if FANCY_STATUS_DUMPS
+		if (drive->media == ide_disk) {
+			printk(" { ");
+			if (err & BBD_ERR)	printk("BadSector ");
+			if (err & ECC_ERR)	printk("UncorrectableError ");
+			if (err & ID_ERR)	printk("SectorIdNotFound ");
+			if (err & ABRT_ERR)	printk("DriveStatusError ");
+			if (err & TRK0_ERR)	printk("TrackZeroNotFound ");
+			if (err & MARK_ERR)	printk("AddrMarkNotFound ");
+			printk("}");
+			if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
+				byte cur = IN_BYTE(IDE_SELECT_REG);
+				if (cur & 0x40) {	/* using LBA? */
+					printk(", LBAsect=%ld", (unsigned long)
+					 ((cur&0xf)<<24)
+					 |(IN_BYTE(IDE_HCYL_REG)<<16)
+					 |(IN_BYTE(IDE_LCYL_REG)<<8)
+					 | IN_BYTE(IDE_SECTOR_REG));
+				} else {
+					printk(", CHS=%d/%d/%d",
+					 (IN_BYTE(IDE_HCYL_REG)<<8) +
+					  IN_BYTE(IDE_LCYL_REG),
+					  cur & 0xf,
+					  IN_BYTE(IDE_SECTOR_REG));
+				}
+				if (HWGROUP(drive)->rq)
+					printk(", sector=%ld", HWGROUP(drive)->rq->sector);
+			}
+		}
+#endif	/* FANCY_STATUS_DUMPS */
+		printk("\n");
+	}
+	restore_flags (flags);
+	return err;
+}
+
+/*
+ * try_to_flush_leftover_data() is invoked in response to a drive
+ * unexpectedly having its DRQ_STAT bit set.  As an alternative to
+ * resetting the drive, this routine tries to clear the condition
+ * by read a sector's worth of data from the drive.  Of course,
+ * this may not help if the drive is *waiting* for data from *us*.
+ */
+static void try_to_flush_leftover_data (ide_drive_t *drive)
+{
+	int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
+
+	while (i > 0) {
+		unsigned long buffer[16];
+		unsigned int wcount = (i > 16) ? 16 : i;
+		i -= wcount;
+		ide_input_data (drive, buffer, wcount);
+	}
+}
+
+/*
+ * ide_error() takes action based on the error returned by the controller.
+ */
+void ide_error (ide_drive_t *drive, const char *msg, byte stat)
+{
+	struct request *rq;
+	byte err;
+
+	err = ide_dump_status(drive, msg, stat);
+	if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
+		return;
+	/* retry only "normal" I/O: */
+	if (rq->cmd == IDE_DRIVE_CMD || (rq->cmd != READ && rq->cmd != WRITE && drive->media == ide_disk))
+	{
+		rq->errors = 1;
+		ide_end_drive_cmd(drive, stat, err);
+		return;
+	}
+	if (stat & BUSY_STAT) {		/* other bits are useless when BUSY */
+		rq->errors |= ERROR_RESET;
+	} else {
+		if (drive->media == ide_disk && (stat & ERR_STAT)) {
+			/* err has different meaning on cdrom and tape */
+			if (err & (BBD_ERR | ECC_ERR))	/* retries won't help these */
+				rq->errors = ERROR_MAX;
+			else if (err & TRK0_ERR)	/* help it find track zero */
+				rq->errors |= ERROR_RECAL;
+		}
+		if ((stat & DRQ_STAT) && rq->cmd != WRITE)
+			try_to_flush_leftover_data(drive);
+	}
+	if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
+		rq->errors |= ERROR_RESET;	/* Mmmm.. timing problem */
+
+	if (rq->errors >= ERROR_MAX) {
+#ifdef CONFIG_BLK_DEV_IDETAPE
+		if (drive->media == ide_tape) {
+			rq->errors = 0;
+			idetape_end_request(0, HWGROUP(drive));
+		}
+		else
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+ 		ide_end_request(0, HWGROUP(drive));
+	}
+	else {
+		if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
+			++rq->errors;
+			ide_do_reset(drive);
+			return;
+		} else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
+			drive->special.b.recalibrate = 1;
+		++rq->errors;
+	}
+}
+
+/*
+ * read_intr() is the handler for disk read/multread interrupts
+ */
+static void read_intr (ide_drive_t *drive)
+{
+	byte stat;
+	int i;
+	unsigned int msect, nsect;
+	struct request *rq;
+
+	if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
+		ide_error(drive, "read_intr", stat);
+		return;
+	}
+	msect = drive->mult_count;
+read_next:
+	rq = HWGROUP(drive)->rq;
+	if (msect) {
+		if ((nsect = rq->current_nr_sectors) > msect)
+			nsect = msect;
+		msect -= nsect;
+	} else
+		nsect = 1;
+	ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
+#ifdef DEBUG
+	printk("%s:  read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
+		drive->name, rq->sector, rq->sector+nsect-1,
+		(unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
+#endif
+	rq->sector += nsect;
+	rq->buffer += nsect<<9;
+	rq->errors = 0;
+	i = (rq->nr_sectors -= nsect);
+	if ((rq->current_nr_sectors -= nsect) <= 0)
+		ide_end_request(1, HWGROUP(drive));
+	if (i > 0) {
+		if (msect)
+			goto read_next;
+		ide_set_handler (drive, &read_intr, WAIT_CMD);
+	}
+}
+
+/*
+ * write_intr() is the handler for disk write interrupts
+ */
+static void write_intr (ide_drive_t *drive)
+{
+	byte stat;
+	int i;
+	ide_hwgroup_t *hwgroup = HWGROUP(drive);
+	struct request *rq = hwgroup->rq;
+
+	if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
+#ifdef DEBUG
+		printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
+			drive->name, rq->sector, (unsigned long) rq->buffer,
+			rq->nr_sectors-1);
+#endif
+		if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
+			rq->sector++;
+			rq->buffer += 512;
+			rq->errors = 0;
+			i = --rq->nr_sectors;
+			--rq->current_nr_sectors;
+			if (rq->current_nr_sectors <= 0)
+				ide_end_request(1, hwgroup);
+			if (i > 0) {
+				ide_output_data (drive, rq->buffer, SECTOR_WORDS);
+				ide_set_handler (drive, &write_intr, WAIT_CMD);
+			}
+			return;
+		}
+	}
+	ide_error(drive, "write_intr", stat);
+}
+
+/*
+ * multwrite() transfers a block of one or more sectors of data to a drive
+ * as part of a disk multwrite operation.
+ */
+static void multwrite (ide_drive_t *drive)
+{
+	struct request *rq = &HWGROUP(drive)->wrq;
+	unsigned int mcount = drive->mult_count;
+
+	do {
+		unsigned int nsect = rq->current_nr_sectors;
+		if (nsect > mcount)
+			nsect = mcount;
+		mcount -= nsect;
+
+		ide_output_data(drive, rq->buffer, nsect<<7);
+#ifdef DEBUG
+		printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
+			drive->name, rq->sector, (unsigned long) rq->buffer,
+			nsect, rq->nr_sectors - nsect);
+#endif
+		if ((rq->nr_sectors -= nsect) <= 0)
+			break;
+		if ((rq->current_nr_sectors -= nsect) == 0) {
+			if ((rq->bh = rq->bh->b_reqnext) != NULL) {
+				rq->current_nr_sectors = rq->bh->b_size>>9;
+				rq->buffer             = rq->bh->b_data;
+			} else {
+				panic("%s: buffer list corrupted\n", drive->name);
+				break;
+			}
+		} else {
+			rq->buffer += nsect << 9;
+		}
+	} while (mcount);
+}
+
+/*
+ * multwrite_intr() is the handler for disk multwrite interrupts
+ */
+static void multwrite_intr (ide_drive_t *drive)
+{
+	byte stat;
+	int i;
+	ide_hwgroup_t *hwgroup = HWGROUP(drive);
+	struct request *rq = &hwgroup->wrq;
+
+	if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
+		if (stat & DRQ_STAT) {
+			if (rq->nr_sectors) {
+				multwrite(drive);
+				ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
+				return;
+			}
+		} else {
+			if (!rq->nr_sectors) {	/* all done? */
+				rq = hwgroup->rq;
+				for (i = rq->nr_sectors; i > 0;){
+					i -= rq->current_nr_sectors;
+					ide_end_request(1, hwgroup);
+				}
+				return;
+			}
+		}
+	}
+	ide_error(drive, "multwrite_intr", stat);
+}
+
+/*
+ * Issue a simple drive command
+ * The drive must be selected beforehand.
+ */
+static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
+{
+	ide_set_handler (drive, handler, WAIT_CMD);
+	OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
+	OUT_BYTE(nsect,IDE_NSECTOR_REG);
+	OUT_BYTE(cmd,IDE_COMMAND_REG);
+}
+
+/*
+ * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
+ */
+static void set_multmode_intr (ide_drive_t *drive)
+{
+	byte stat = GET_STAT();
+
+	sti();
+	if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
+		drive->mult_count = drive->mult_req;
+	} else {
+		drive->mult_req = drive->mult_count = 0;
+		drive->special.b.recalibrate = 1;
+		(void) ide_dump_status(drive, "set_multmode", stat);
+	}
+}
+
+/*
+ * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
+ */
+static void set_geometry_intr (ide_drive_t *drive)
+{
+	byte stat = GET_STAT();
+
+	sti();
+	if (!OK_STAT(stat,READY_STAT,BAD_STAT))
+		ide_error(drive, "set_geometry_intr", stat);
+}
+
+/*
+ * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
+ */
+static void recal_intr (ide_drive_t *drive)
+{
+	byte stat = GET_STAT();
+
+	sti();
+	if (!OK_STAT(stat,READY_STAT,BAD_STAT))
+		ide_error(drive, "recal_intr", stat);
+}
+
+/*
+ * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
+ */
+static void drive_cmd_intr (ide_drive_t *drive)
+{
+	byte stat = GET_STAT();
+
+	sti();
+	if (OK_STAT(stat,READY_STAT,BAD_STAT))
+		ide_end_drive_cmd (drive, stat, GET_ERR());
+	else
+		ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
+}
+
+/*
+ * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
+ * commands to a drive.  It used to do much more, but has been scaled back.
+ */
+static inline void do_special (ide_drive_t *drive)
+{
+	special_t *s = &drive->special;
+next:
+#ifdef DEBUG
+	printk("%s: do_special: 0x%02x\n", drive->name, s->all);
+#endif
+	if (s->b.set_geometry) {
+		s->b.set_geometry = 0;
+		if (drive->media == ide_disk) {
+			OUT_BYTE(drive->sect,IDE_SECTOR_REG);
+			OUT_BYTE(drive->cyl,IDE_LCYL_REG);
+			OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
+			OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
+			ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
+		}
+	} else if (s->b.recalibrate) {
+		s->b.recalibrate = 0;
+		if (drive->media == ide_disk) {
+			ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
+		}
+	} else if (s->b.set_pio) {
+		ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
+		s->b.set_pio = 0;
+		if (tuneproc != NULL)
+			tuneproc(drive, drive->pio_req);
+		goto next;
+	} else if (s->b.set_multmode) {
+		s->b.set_multmode = 0;
+		if (drive->media == ide_disk) {
+			if (drive->id && drive->mult_req > drive->id->max_multsect)
+				drive->mult_req = drive->id->max_multsect;
+			ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
+		} else
+			drive->mult_req = 0;
+	} else if (s->all) {
+		s->all = 0;
+		printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
+	}
+}
+
+/*
+ * This routine busy-waits for the drive status to be not "busy".
+ * It then checks the status for all of the "good" bits and none
+ * of the "bad" bits, and if all is okay it returns 0.  All other
+ * cases return 1 after invoking ide_error() -- caller should just return.
+ *
+ * This routine should get fixed to not hog the cpu during extra long waits..
+ * That could be done by busy-waiting for the first jiffy or two, and then
+ * setting a timer to wake up at half second intervals thereafter,
+ * until timeout is achieved, before timing out.
+ */
+int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
+{
+	byte stat;
+	unsigned long flags;
+
+test:
+	udelay(1);	/* spec allows drive 400ns to change "BUSY" */
+	if (OK_STAT((stat = GET_STAT()), good, bad))
+		return 0;	/* fast exit for most frequent case */
+	if (!(stat & BUSY_STAT)) {
+		ide_error(drive, "status error", stat);
+		return 1;
+	}
+
+	save_flags(flags);
+	sti();
+	timeout += jiffies;
+	do {
+		if (!((stat = GET_STAT()) & BUSY_STAT)) {
+			restore_flags(flags);
+			goto test;
+		}
+	} while (jiffies <= timeout);
+
+	restore_flags(flags);
+	ide_error(drive, "status timeout", GET_STAT());
+	return 1;
+}
+
+/*
+ * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
+ * using LBA if supported, or CHS otherwise, to address sectors.  It also takes
+ * care of issuing special DRIVE_CMDs.
+ */
+static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
+{
+	unsigned short io_base = HWIF(drive)->io_base;
+
+	OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
+	OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
+	if (drive->select.b.lba) {
+#ifdef DEBUG
+		printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
+			drive->name, (rq->cmd==READ)?"read":"writ",
+			block, rq->nr_sectors, (unsigned long) rq->buffer);
+#endif
+		OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
+		OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
+		OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
+		OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
+	} else {
+		unsigned int sect,head,cyl,track;
+		track = block / drive->sect;
+		sect  = block % drive->sect + 1;
+		OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
+		head  = track % drive->head;
+		cyl   = track / drive->head;
+		OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
+		OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
+		OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
+#ifdef DEBUG
+		printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
+			drive->name, (rq->cmd==READ)?"read":"writ", cyl,
+			head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
+#endif
+	}
+	if (rq->cmd == READ) {
+#ifdef CONFIG_BLK_DEV_TRITON
+		if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
+			return;
+#endif /* CONFIG_BLK_DEV_TRITON */
+		ide_set_handler(drive, &read_intr, WAIT_CMD);
+		OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
+		return;
+	}
+	if (rq->cmd == WRITE) {
+#ifdef CONFIG_BLK_DEV_TRITON
+		if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
+			return;
+#endif /* CONFIG_BLK_DEV_TRITON */
+		OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
+		if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
+			printk("%s: no DRQ after issuing %s\n", drive->name,
+				drive->mult_count ? "MULTWRITE" : "WRITE");
+			return;
+		}
+		if (!drive->unmask)
+			cli();
+		if (drive->mult_count) {
+			HWGROUP(drive)->wrq = *rq; /* scratchpad */
+			ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
+			multwrite(drive);
+		} else {
+			ide_set_handler (drive, &write_intr, WAIT_CMD);
+			ide_output_data(drive, rq->buffer, SECTOR_WORDS);
+		}
+		return;
+	}
+	if (rq->cmd == IDE_DRIVE_CMD) {
+		byte *args = rq->buffer;
+		if (args) {
+#ifdef DEBUG
+			printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
+			 drive->name, args[0], args[1], args[2]);
+#endif
+			OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
+			ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
+			return;
+		} else {
+			/*
+			 * NULL is actually a valid way of waiting for
+			 * all current requests to be flushed from the queue.
+			 */
+#ifdef DEBUG
+			printk("%s: DRIVE_CMD (null)\n", drive->name);
+#endif
+			ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
+			return;
+		}
+	}
+	printk("%s: bad command: %d\n", drive->name, rq->cmd);
+	ide_end_request(0, HWGROUP(drive));
+}
+
+/*
+ * do_request() initiates handling of a new I/O request
+ */
+static inline void do_request (ide_hwif_t *hwif, struct request *rq)
+{
+	unsigned int minor, unit;
+	unsigned long block, blockend;
+	ide_drive_t *drive;
+
+	sti();
+#ifdef DEBUG
+	printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
+#endif
+	minor = MINOR(rq->rq_dev);
+	unit = minor >> PARTN_BITS;
+	if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
+		printk("%s: bad device number: %s\n",
+		       hwif->name, kdevname(rq->rq_dev));
+		goto kill_rq;
+	}
+	drive = &hwif->drives[unit];
+#ifdef DEBUG
+	if (rq->bh && !buffer_locked(rq->bh)) {
+		printk("%s: block not locked\n", drive->name);
+		goto kill_rq;
+	}
+#endif
+	block    = rq->sector;
+	blockend = block + rq->nr_sectors;
+	if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
+		printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
+		 (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
+		goto kill_rq;
+	}
+	block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
+#if FAKE_FDISK_FOR_EZDRIVE
+	if (block == 0 && drive->remap_0_to_1)
+		block = 1;  /* redirect MBR access to EZ-Drive partn table */
+#endif /* FAKE_FDISK_FOR_EZDRIVE */
+	((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
+#ifdef CONFIG_BLK_DEV_HT6560B
+	if (hwif->selectproc)
+		hwif->selectproc (drive);
+#endif /* CONFIG_BLK_DEV_HT6560B */
+#if (DISK_RECOVERY_TIME > 0)
+	while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
+#endif
+
+#ifdef CONFIG_BLK_DEV_IDETAPE
+	POLL_HWIF_TAPE_DRIVE;	/* macro from ide-tape.h */
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+
+	OUT_BYTE(drive->select.all,IDE_SELECT_REG);
+	if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
+		printk("%s: drive not ready for command\n", drive->name);
+		return;
+	}
+	
+	if (!drive->special.all) {
+#ifdef CONFIG_BLK_DEV_IDEATAPI
+		switch (drive->media) {
+			case ide_disk:
+				do_rw_disk (drive, rq, block);
+				return;
+#ifdef CONFIG_BLK_DEV_IDECD
+			case ide_cdrom:
+				ide_do_rw_cdrom (drive, block);
+				return;
+#endif /* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+			case ide_tape:
+				if (rq->cmd == IDE_DRIVE_CMD) {
+					byte *args = (byte *) rq->buffer;
+					OUT_BYTE(args[2],IDE_FEATURE_REG);
+					ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
+					return;
+				}
+				idetape_do_request (drive, rq, block);
+				return;
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+
+			default:
+				printk("%s: media type %d not supported\n",
+					drive->name, drive->media);
+				goto kill_rq;
+		}
+#else
+		do_rw_disk (drive, rq, block); /* simpler and faster */
+		return;
+#endif /* CONFIG_BLK_DEV_IDEATAPI */;
+	}
+	do_special(drive);
+	return;
+kill_rq:
+	ide_end_request(0, hwif->hwgroup);
+}
+
+/*
+ * The driver enables interrupts as much as possible.  In order to do this,
+ * (a) the device-interrupt is always masked before entry, and
+ * (b) the timeout-interrupt is always disabled before entry.
+ *
+ * If we enter here from, say irq14, and then start a new request for irq15,
+ * (possible with "serialize" option) then we cannot ensure that we exit
+ * before the irq15 hits us. So, we must be careful not to let this bother us.
+ *
+ * Interrupts are still masked (by default) whenever we are exchanging
+ * data/cmds with a drive, because some drives seem to have very poor
+ * tolerance for latency during I/O.  For devices which don't suffer from
+ * this problem (most don't), the unmask flag can be set using the "hdparm"
+ * utility, to permit other interrupts during data/cmd transfers.
+ */
+void ide_do_request (ide_hwgroup_t *hwgroup)
+{
+	cli();	/* paranoia */
+	if (hwgroup->handler != NULL) {
+		printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
+		return;
+	}
+	do {
+		ide_hwif_t *hwif = hwgroup->hwif;
+		struct request *rq;
+		if ((rq = hwgroup->rq) == NULL) {
+			do {
+				rq = blk_dev[hwif->major].current_request;
+				if (rq != NULL && rq->rq_status != RQ_INACTIVE)
+					goto got_rq;
+			} while ((hwif = hwif->next) != hwgroup->hwif);
+			return;		/* no work left for this hwgroup */
+		}
+	got_rq:	
+		do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
+		cli();
+	} while (hwgroup->handler == NULL);
+}
+
+/*
+ * do_hwgroup_request() invokes ide_do_request() after first masking
+ * all possible interrupts for the current hwgroup.  This prevents race
+ * conditions in the event that an unexpected interrupt occurs while
+ * we are in the driver.
+ *
+ * Note that when an interrupt is used to reenter the driver, the first level
+ * handler will already have masked the irq that triggered, but any other ones
+ * for the hwgroup will still be unmasked.  The driver tries to be careful
+ * about such things.
+ */
+static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
+{
+	if (hwgroup->handler == NULL) {
+		ide_hwif_t *hgif = hwgroup->hwif;
+		ide_hwif_t *hwif = hgif;
+		do {
+			disable_irq(hwif->irq);
+		} while ((hwif = hwif->next) != hgif);
+		ide_do_request (hwgroup);
+		do {
+			enable_irq(hwif->irq);
+		} while ((hwif = hwif->next) != hgif);
+	}
+}
+
+static void do_ide0_request (void)	/* invoked with cli() */
+{
+	do_hwgroup_request (ide_hwifs[0].hwgroup);
+}
+
+static void do_ide1_request (void)	/* invoked with cli() */
+{
+	do_hwgroup_request (ide_hwifs[1].hwgroup);
+}
+
+static void do_ide2_request (void)	/* invoked with cli() */
+{
+	do_hwgroup_request (ide_hwifs[2].hwgroup);
+}
+
+static void do_ide3_request (void)	/* invoked with cli() */
+{
+	do_hwgroup_request (ide_hwifs[3].hwgroup);
+}
+
+static void timer_expiry (unsigned long data)
+{
+	ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
+	ide_drive_t   *drive   = hwgroup->drive;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+
+	if (hwgroup->poll_timeout != 0) { /* polling in progress? */
+		ide_handler_t *handler = hwgroup->handler;
+		hwgroup->handler = NULL;
+		handler(drive);
+	} else if (hwgroup->handler == NULL) {	 /* not waiting for anything? */
+		sti(); /* drive must have responded just as the timer expired */
+		printk("%s: marginal timeout\n", drive->name);
+	} else {
+		hwgroup->handler = NULL;	/* abort the operation */
+		if (hwgroup->hwif->dmaproc)
+			(void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
+		ide_error(drive, "irq timeout", GET_STAT());
+	}
+	if (hwgroup->handler == NULL)
+		do_hwgroup_request (hwgroup);
+	restore_flags(flags);
+}
+
+/*
+ * There's nothing really useful we can do with an unexpected interrupt,
+ * other than reading the status register (to clear it), and logging it.
+ * There should be no way that an irq can happen before we're ready for it,
+ * so we needn't worry much about losing an "important" interrupt here.
+ *
+ * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
+ * drive enters "idle", "standby", or "sleep" mode, so if the status looks
+ * "good", we just ignore the interrupt completely.
+ *
+ * This routine assumes cli() is in effect when called.
+ *
+ * If an unexpected interrupt happens on irq15 while we are handling irq14
+ * and if the two interfaces are "serialized" (CMD640B), then it looks like
+ * we could screw up by interfering with a new request being set up for irq15.
+ *
+ * In reality, this is a non-issue.  The new command is not sent unless the
+ * drive is ready to accept one, in which case we know the drive is not
+ * trying to interrupt us.  And ide_set_handler() is always invoked before
+ * completing the issuance of any new drive command, so we will not be
+ * accidently invoked as a result of any valid command completion interrupt.
+ *
+ */
+static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
+{
+	byte stat;
+	unsigned int unit;
+	ide_hwif_t *hwif = hwgroup->hwif;
+
+	/*
+	 * handle the unexpected interrupt
+	 */
+	do {
+		if (hwif->irq == irq) {
+			for (unit = 0; unit < MAX_DRIVES; ++unit) {
+				ide_drive_t *drive = &hwif->drives[unit];
+				if (!drive->present)
+					continue;
+#ifdef CONFIG_BLK_DEV_HT6560B
+				if (hwif->selectproc)
+					hwif->selectproc (drive);
+#endif /* CONFIG_BLK_DEV_HT6560B */
+				if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
+					(void) ide_dump_status(drive, "unexpected_intr", stat);
+				if ((stat & DRQ_STAT))
+					try_to_flush_leftover_data(drive);
+			}
+		}
+	} while ((hwif = hwif->next) != hwgroup->hwif);
+#ifdef CONFIG_BLK_DEV_HT6560B
+	if (hwif->selectproc)
+		hwif->selectproc (hwgroup->drive);
+#endif /* CONFIG_BLK_DEV_HT6560B */
+}
+
+/*
+ * entry point for all interrupts, caller does cli() for us
+ */
+static void ide_intr (int irq, struct pt_regs *regs)
+{
+	ide_hwgroup_t  *hwgroup = irq_to_hwgroup[irq];
+	ide_handler_t  *handler;
+
+	if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
+		ide_drive_t *drive = hwgroup->drive;
+		hwgroup->handler = NULL;
+		del_timer(&(hwgroup->timer));
+		if (drive->unmask)
+			sti();
+		handler(drive);
+		cli();	/* this is necessary, as next rq may be different irq */
+		if (hwgroup->handler == NULL) {
+			SET_RECOVERY_TIMER(HWIF(drive));
+			ide_do_request(hwgroup);
+		}
+	} else {
+		unexpected_intr(irq, hwgroup);
+	}
+	cli();
+}
+
+/*
+ * get_info_ptr() returns the (ide_drive_t *) for a given device number.
+ * It returns NULL if the given device number does not match any present drives.
+ */
+static ide_drive_t *get_info_ptr (kdev_t i_rdev)
+{
+	int		major = MAJOR(i_rdev);
+	unsigned int	h;
+
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		ide_hwif_t  *hwif = &ide_hwifs[h];
+		if (hwif->present && major == hwif->major) {
+			unsigned unit = DEVICE_NR(i_rdev);
+			if (unit < MAX_DRIVES) {
+				ide_drive_t *drive = &hwif->drives[unit];
+				if (drive->present)
+					return drive;
+			} else if (major == IDE0_MAJOR && unit < 4) {
+				printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
+				printk("ide: to fix it, run:  /usr/src/linux/drivers/block/MAKEDEV.ide\n");
+			}
+			break;
+		}
+	}
+	return NULL;
+}
+
+/*
+ * This function is intended to be used prior to invoking ide_do_drive_cmd().
+ */
+void ide_init_drive_cmd (struct request *rq)
+{
+	rq->buffer = NULL;
+	rq->cmd = IDE_DRIVE_CMD;
+	rq->sector = 0;
+	rq->nr_sectors = 0;
+	rq->current_nr_sectors = 0;
+	rq->sem = NULL;
+	rq->bh = NULL;
+	rq->bhtail = NULL;
+	rq->next = NULL;
+
+#if 0	/* these are done each time through ide_do_drive_cmd() */
+	rq->errors = 0;
+	rq->rq_status = RQ_ACTIVE;
+	rq->rq_dev = ????;
+#endif
+}
+
+/*
+ * This function issues a special IDE device request
+ * onto the request queue.
+ *
+ * If action is ide_wait, then then rq is queued at the end of
+ * the request queue, and the function sleeps until it has been
+ * processed.  This is for use when invoked from an ioctl handler.
+ *
+ * If action is ide_preempt, then the rq is queued at the head of
+ * the request queue, displacing the currently-being-processed
+ * request and this function returns immediately without waiting
+ * for the new rq to be completed.  This is VERY DANGEROUS, and is
+ * intended for careful use by the ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_next, then the rq is queued immediately after
+ * the currently-being-processed-request (if any), and the function
+ * returns without waiting for the new rq to be completed.  As above,
+ * This is VERY DANGEROUS, and is intended for careful use by the
+ * ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_end, then the rq is queued at the end of the
+ * request queue, and the function returns immediately without waiting
+ * for the new rq to be completed. This is again intended for careful
+ * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
+ * when operating in the pipelined operation mode).
+ */
+int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
+{
+	unsigned long flags;
+	unsigned int major = HWIF(drive)->major;
+	struct request *cur_rq;
+	struct blk_dev_struct *bdev = &blk_dev[major];
+	struct semaphore sem = MUTEX_LOCKED;
+
+	rq->errors = 0;
+	rq->rq_status = RQ_ACTIVE;
+	rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
+	if (action == ide_wait)
+		rq->sem = &sem;
+
+	save_flags(flags);
+	cli();
+	cur_rq = bdev->current_request;
+
+	if (cur_rq == NULL || action == ide_preempt) {
+		rq->next = cur_rq;
+		bdev->current_request = rq;
+		if (action == ide_preempt) {
+			HWGROUP(drive)->rq = NULL;
+		} else
+		if (HWGROUP(drive)->rq == NULL) {  /* is this necessary (?) */
+			bdev->request_fn();
+			cli();
+		}
+	} else {
+		if (action == ide_wait || action == ide_end) {
+			while (cur_rq->next != NULL)	/* find end of list */
+				cur_rq = cur_rq->next;
+		}
+		rq->next = cur_rq->next;
+		cur_rq->next = rq;
+	}
+	if (action == ide_wait  && rq->rq_status != RQ_INACTIVE)
+		down(&sem);	/* wait for it to be serviced */
+	restore_flags(flags);
+	return rq->errors ? -EIO : 0;	/* return -EIO if errors */
+}
+
+static int ide_open(struct inode * inode, struct file * filp)
+{
+	ide_drive_t *drive;
+	unsigned long flags;
+
+	if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
+		return -ENODEV;
+	save_flags(flags);
+	cli();
+	while (drive->busy)
+		sleep_on(&drive->wqueue);
+	drive->usage++;
+	restore_flags(flags);
+#ifdef CONFIG_BLK_DEV_IDECD
+	if (drive->media == ide_cdrom)
+		return ide_cdrom_open (inode, filp, drive);
+#endif	/* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+	if (drive->media == ide_tape)
+		return idetape_blkdev_open (inode, filp, drive);
+#endif	/* CONFIG_BLK_DEV_IDETAPE */
+	if (drive->removeable) {
+		byte door_lock[] = {WIN_DOORLOCK,0,0,0};
+		struct request rq;
+		check_disk_change(inode->i_rdev);
+		ide_init_drive_cmd (&rq);
+		rq.buffer = door_lock;
+		/*
+		 * Ignore the return code from door_lock,
+		 * since the open() has already succeeded,
+		 * and the door_lock is irrelevant at this point.
+		 */
+		(void) ide_do_drive_cmd(drive, &rq, ide_wait);
+	}
+	return 0;
+}
+
+/*
+ * Releasing a block device means we sync() it, so that it can safely
+ * be forgotten about...
+ */
+static void ide_release(struct inode * inode, struct file * file)
+{
+	ide_drive_t *drive;
+
+	if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
+		sync_dev(inode->i_rdev);
+		drive->usage--;
+#ifdef CONFIG_BLK_DEV_IDECD
+		if (drive->media == ide_cdrom) {
+			ide_cdrom_release (inode, file, drive);
+			return;
+		}
+#endif	/* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+		if (drive->media == ide_tape) {
+			idetape_blkdev_release (inode, file, drive);
+			return;
+		}
+#endif	/* CONFIG_BLK_DEV_IDETAPE */
+		if (drive->removeable) {
+			byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
+			struct request rq;
+			invalidate_buffers(inode->i_rdev);
+			ide_init_drive_cmd (&rq);
+			rq.buffer = door_unlock;
+			(void) ide_do_drive_cmd(drive, &rq, ide_wait);
+		}
+	}
+}
+
+/*
+ * This routine is called to flush all partitions and partition tables
+ * for a changed disk, and then re-read the new partition table.
+ * If we are revalidating a disk because of a media change, then we
+ * enter with usage == 0.  If we are using an ioctl, we automatically have
+ * usage == 1 (we need an open channel to use an ioctl :-), so this
+ * is our limit.
+ */
+static int revalidate_disk(kdev_t i_rdev)
+{
+	ide_drive_t *drive;
+	unsigned int p, major, minor;
+	long flags;
+
+	if ((drive = get_info_ptr(i_rdev)) == NULL)
+		return -ENODEV;
+
+	major = MAJOR(i_rdev);
+	minor = drive->select.b.unit << PARTN_BITS;
+	save_flags(flags);
+	cli();
+	if (drive->busy || (drive->usage > 1)) {
+		restore_flags(flags);
+		return -EBUSY;
+	};
+	drive->busy = 1;
+	restore_flags(flags);
+
+	for (p = 0; p < (1<<PARTN_BITS); ++p) {
+		if (drive->part[p].nr_sects > 0) {
+			kdev_t devp = MKDEV(major, minor+p);
+			sync_dev           (devp);
+			invalidate_inodes  (devp);
+			invalidate_buffers (devp);
+		}
+		drive->part[p].start_sect = 0;
+		drive->part[p].nr_sects   = 0;
+	};
+
+	drive->part[0].nr_sects = current_capacity(drive);
+	if (drive->media == ide_disk)
+		resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
+
+	drive->busy = 0;
+	wake_up(&drive->wqueue);
+	return 0;
+}
+
+static int write_fs_long (unsigned long useraddr, long value)
+{
+	int err;
+
+	if (NULL == (long *)useraddr)
+		return -EINVAL;
+	if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
+		return err;
+	put_user((unsigned)value, (long *) useraddr);
+	return 0;
+}
+
+static int ide_ioctl (struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg)
+{
+	struct hd_geometry *loc = (struct hd_geometry *) arg;
+	int err;
+	ide_drive_t *drive;
+	unsigned long flags;
+	struct request rq;
+
+	ide_init_drive_cmd (&rq);
+	if (!inode || !(inode->i_rdev))
+		return -EINVAL;
+	if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
+		return -ENODEV;
+	switch (cmd) {
+		case HDIO_GETGEO:
+			if (!loc || drive->media != ide_disk) return -EINVAL;
+			err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
+			if (err) return err;
+			put_user(drive->bios_head, (byte *) &loc->heads);
+			put_user(drive->bios_sect, (byte *) &loc->sectors);
+			put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
+			put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
+				(unsigned long *) &loc->start);
+			return 0;
+
+		case BLKFLSBUF:
+			if(!suser()) return -EACCES;
+			fsync_dev(inode->i_rdev);
+			invalidate_buffers(inode->i_rdev);
+			return 0;
+
+		case BLKRASET:
+			if(!suser()) return -EACCES;
+			if(arg > 0xff) return -EINVAL;
+			read_ahead[MAJOR(inode->i_rdev)] = arg;
+			return 0;
+
+		case BLKRAGET:
+			return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
+
+	 	case BLKGETSIZE:   /* Return device size */
+			return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
+		case BLKRRPART: /* Re-read partition tables */
+			return revalidate_disk(inode->i_rdev);
+
+		case HDIO_GET_KEEPSETTINGS:
+			return write_fs_long(arg, drive->keep_settings);
+
+		case HDIO_GET_UNMASKINTR:
+			return write_fs_long(arg, drive->unmask);
+
+		case HDIO_GET_DMA:
+			return write_fs_long(arg, drive->using_dma);
+
+		case HDIO_GET_32BIT:
+			return write_fs_long(arg, drive->io_32bit);
+
+		case HDIO_GET_MULTCOUNT:
+			return write_fs_long(arg, drive->mult_count);
+
+		case HDIO_GET_IDENTITY:
+			if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
+				return -EINVAL;
+			if (drive->id == NULL)
+				return -ENOMSG;
+			err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
+			if (!err)
+				memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
+			return err;
+
+			case HDIO_GET_NOWERR:
+			return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
+
+		case HDIO_SET_DMA:
+#ifdef CONFIG_BLK_DEV_IDECD
+			if (drive->media == ide_cdrom)
+				return -EPERM;
+#endif /* CONFIG_BLK_DEV_IDECD */
+			if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
+				return -EPERM;
+		case HDIO_SET_KEEPSETTINGS:
+		case HDIO_SET_UNMASKINTR:
+		case HDIO_SET_NOWERR:
+			if (arg > 1)
+				return -EINVAL;
+		case HDIO_SET_32BIT:
+			if (!suser())
+				return -EACCES;
+			if ((MINOR(inode->i_rdev) & PARTN_MASK))
+				return -EINVAL;
+			save_flags(flags);
+			cli();
+			switch (cmd) {
+				case HDIO_SET_DMA:
+					if (!(HWIF(drive)->dmaproc)) {
+						restore_flags(flags);
+						return -EPERM;
+					}
+					drive->using_dma = arg;
+					break;
+				case HDIO_SET_KEEPSETTINGS:
+					drive->keep_settings = arg;
+					break;
+				case HDIO_SET_UNMASKINTR:
+					if (arg && HWIF(drive)->no_unmask) {
+						restore_flags(flags);
+						return -EPERM;
+					}
+					drive->unmask = arg;
+					break;
+				case HDIO_SET_NOWERR:
+					drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
+					break;
+				case HDIO_SET_32BIT:
+					if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
+						return -EINVAL;
+					drive->io_32bit = arg;
+#ifdef CONFIG_BLK_DEV_DTC2278
+					if (HWIF(drive)->chipset == ide_dtc2278)
+						HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
+#endif /* CONFIG_BLK_DEV_DTC2278 */
+					break;
+			}
+			restore_flags(flags);
+			return 0;
+
+		case HDIO_SET_MULTCOUNT:
+			if (!suser())
+				return -EACCES;
+			if (MINOR(inode->i_rdev) & PARTN_MASK)
+				return -EINVAL;
+			if (drive->id && arg > drive->id->max_multsect)
+				return -EINVAL;
+			save_flags(flags);
+			cli();
+			if (drive->special.b.set_multmode) {
+				restore_flags(flags);
+				return -EBUSY;
+			}
+			drive->mult_req = arg;
+			drive->special.b.set_multmode = 1;
+			restore_flags(flags);
+			(void) ide_do_drive_cmd (drive, &rq, ide_wait);
+			return (drive->mult_count == arg) ? 0 : -EIO;
+
+		case HDIO_DRIVE_CMD:
+		{
+			unsigned long args;
+
+			if (NULL == (long *) arg)
+				err = ide_do_drive_cmd(drive, &rq, ide_wait);
+			else {
+				if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
+				{
+					args = get_user((long *)arg);
+					if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
+						rq.buffer = (char *) &args;
+						err = ide_do_drive_cmd(drive, &rq, ide_wait);
+						put_user(args,(long *)arg);
+					}
+				}
+			}
+			return err;
+		}
+		case HDIO_SET_PIO_MODE:
+			if (!suser())
+				return -EACCES;
+			if (MINOR(inode->i_rdev) & PARTN_MASK)
+				return -EINVAL;
+			if (!HWIF(drive)->tuneproc)
+				return -ENOSYS;
+			save_flags(flags);
+			cli();
+			drive->pio_req = (int) arg;
+			drive->special.b.set_pio = 1;
+			restore_flags(flags);
+			return 0;
+
+		RO_IOCTLS(inode->i_rdev, arg);
+
+		default:
+#ifdef CONFIG_BLK_DEV_IDECD
+			if (drive->media == ide_cdrom)
+				return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
+#endif /* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+			if (drive->media == ide_tape)
+				return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+			return -EPERM;
+	}
+}
+
+static int ide_check_media_change (kdev_t i_rdev)
+{
+	ide_drive_t *drive;
+
+	if ((drive = get_info_ptr(i_rdev)) == NULL)
+		return -ENODEV;
+#ifdef CONFIG_BLK_DEV_IDECD
+	if (drive->media == ide_cdrom)
+		return ide_cdrom_check_media_change (drive);
+#endif	/* CONFIG_BLK_DEV_IDECD */
+	if (drive->removeable) /* for disks */
+		return 1;	/* always assume it was changed */
+	return 0;
+}
+
+void ide_fixstring (byte *s, const int bytecount, const int byteswap)
+{
+	byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
+
+	if (byteswap) {
+		/* convert from big-endian to host byte order */
+		for (p = end ; p != s;) {
+			unsigned short *pp = (unsigned short *) (p -= 2);
+			*pp = ntohs(*pp);
+		}
+	}
+
+	/* strip leading blanks */
+	while (s != end && *s == ' ')
+		++s;
+
+	/* compress internal blanks and strip trailing blanks */
+	while (s != end && *s) {
+		if (*s++ != ' ' || (s != end && *s && *s != ' '))
+			*p++ = *(s-1);
+	}
+
+	/* wipe out trailing garbage */
+	while (p != end)
+		*p++ = '\0';
+}
+
+static inline void do_identify (ide_drive_t *drive, byte cmd)
+{
+	int bswap;
+	struct hd_driveid *id;
+	unsigned long capacity, check;
+
+	id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
+	ide_input_data(drive, id, SECTOR_WORDS);	/* read 512 bytes of id info */
+	sti();
+
+	/*
+	 * EATA SCSI controllers do a hardware ATA emulation:  ignore them
+	 */
+	if ((id->model[0] == 'P' && id->model[1] == 'M')
+	 || (id->model[0] == 'S' && id->model[1] == 'K')) {
+		printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
+		drive->present = 0;
+		return;
+	}
+
+	/*
+	 *  WIN_IDENTIFY returns little-endian info,
+	 *  WIN_PIDENTIFY *usually* returns little-endian info.
+	 */
+	bswap = 1;
+	if (cmd == WIN_PIDENTIFY) {
+		if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
+		 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
+		 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
+			bswap = 0;	/* Vertos drives may still be weird */
+	}
+	ide_fixstring (id->model,     sizeof(id->model),     bswap);
+	ide_fixstring (id->fw_rev,    sizeof(id->fw_rev),    bswap);
+	ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
+
+	/*
+	 * Check for an ATAPI device
+	 */
+
+	if (cmd == WIN_PIDENTIFY) {
+		byte type = (id->config >> 8) & 0x1f;
+		printk("%s: %s, ATAPI ", drive->name, id->model);
+		switch (type) {
+			case 0:		/* Early cdrom models used zero */
+			case 5:
+#ifdef CONFIG_BLK_DEV_IDECD
+				printk ("CDROM drive\n");
+				drive->media = ide_cdrom;
+ 				drive->present = 1;
+				drive->removeable = 1;
+				return;
+#else
+				printk ("CDROM ");
+				break;
+#endif /* CONFIG_BLK_DEV_IDECD */
+			case 1:
+#ifdef CONFIG_BLK_DEV_IDETAPE
+				printk ("TAPE drive");
+				if (idetape_identify_device (drive,id)) {
+					drive->media = ide_tape;
+					drive->present = 1;
+					drive->removeable = 1;
+					if (HWIF(drive)->dmaproc != NULL &&
+					    !HWIF(drive)->dmaproc(ide_dma_check, drive))
+						printk(", DMA");
+					printk("\n");
+				}
+				else {
+					drive->present = 0;
+					printk ("\nide-tape: the tape is not supported by this version of the driver\n");
+				}
+				return;
+#else
+				printk ("TAPE ");
+				break;
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+			default:
+				drive->present = 0;
+				printk("Type %d - Unknown device\n", type);
+				return;
+		}
+		drive->present = 0;
+		printk("- not supported by this kernel\n");
+		return;
+	}
+
+	/* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
+	if (id->config & (1<<7)) {	/* removeable disk ? */
+		if (id->model[0] != 'W' || id->model[1] != 'D')
+			drive->removeable = 1;
+	}
+
+	drive->media = ide_disk;
+	/* Extract geometry if we did not already have one for the drive */
+	if (!drive->present) {
+		drive->present = 1;
+		drive->cyl     = drive->bios_cyl  = id->cyls;
+		drive->head    = drive->bios_head = id->heads;
+		drive->sect    = drive->bios_sect = id->sectors;
+	}
+	/* Handle logical geometry translation by the drive */
+	if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
+	 && (id->cur_heads <= 16) && id->cur_sectors)
+	{
+		/*
+		 * Extract the physical drive geometry for our use.
+		 * Note that we purposely do *not* update the bios info.
+		 * This way, programs that use it (like fdisk) will
+		 * still have the same logical view as the BIOS does,
+		 * which keeps the partition table from being screwed.
+		 *
+		 * An exception to this is the cylinder count,
+		 * which we reexamine later on to correct for 1024 limitations.
+		 */
+		drive->cyl  = id->cur_cyls;
+		drive->head = id->cur_heads;
+		drive->sect = id->cur_sectors;
+
+		/* check for word-swapped "capacity" field in id information */
+		capacity = drive->cyl * drive->head * drive->sect;
+		check = (id->cur_capacity0 << 16) | id->cur_capacity1;
+		if (check == capacity) {	/* was it swapped? */
+			/* yes, bring it into little-endian order: */
+			id->cur_capacity0 = (capacity >>  0) & 0xffff;
+			id->cur_capacity1 = (capacity >> 16) & 0xffff;
+		}
+	}
+	/* Use physical geometry if what we have still makes no sense */
+	if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
+		drive->cyl  = id->cyls;
+		drive->head = id->heads;
+		drive->sect = id->sectors;
+	}
+	/* Correct the number of cyls if the bios value is too small */
+	if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
+		if (drive->cyl > drive->bios_cyl)
+			drive->bios_cyl = drive->cyl;
+	}
+
+	(void) current_capacity (drive); /* initialize LBA selection */
+
+	printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
+	 drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
+	 drive->select.b.lba ? "LBA, " : "",
+	 drive->bios_cyl, drive->bios_head, drive->bios_sect);
+
+	drive->mult_count = 0;
+	if (id->max_multsect) {
+		drive->mult_req = INITIAL_MULT_COUNT;
+		if (drive->mult_req > id->max_multsect)
+			drive->mult_req = id->max_multsect;
+		if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
+			drive->special.b.set_multmode = 1;
+	}
+	if (HWIF(drive)->dmaproc != NULL) {	/* hwif supports DMA? */
+		if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
+			printk(", DMA");
+	}
+	printk("\n");
+}
+
+/*
+ * Delay for *at least* 10ms.  As we don't know how much time is left
+ * until the next tick occurs, we wait an extra tick to be safe.
+ * This is used only during the probing/polling for drives at boot time.
+ */
+static void delay_10ms (void)
+{
+	unsigned long timer = jiffies + (HZ + 99)/100 + 1;
+	while (timer > jiffies);
+}
+
+/*
+ * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
+ * and waits for a response.  It also monitors irqs while this is
+ * happening, in hope of automatically determining which one is
+ * being used by the interface.
+ *
+ * Returns:	0  device was identified
+ *		1  device timed-out (no response to identify request)
+ *		2  device aborted the command (refused to identify itself)
+ */
+static int try_to_identify (ide_drive_t *drive, byte cmd)
+{
+	int hd_status, rc;
+	unsigned long timeout;
+	int irqs = 0;
+
+	if (!HWIF(drive)->irq) {		/* already got an IRQ? */
+		probe_irq_off(probe_irq_on());	/* clear dangling irqs */
+		irqs = probe_irq_on();		/* start monitoring irqs */
+		OUT_BYTE(drive->ctl,IDE_CONTROL_REG);	/* enable device irq */
+	}
+
+	delay_10ms();				/* take a deep breath */
+	if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
+		printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
+		hd_status = IDE_STATUS_REG;	/* ancient Seagate drives */
+	} else
+		hd_status = IDE_ALTSTATUS_REG;	/* use non-intrusive polling */
+
+	OUT_BYTE(cmd,IDE_COMMAND_REG);		/* ask drive for ID */
+	timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
+	timeout += jiffies;
+	do {
+		if (jiffies > timeout) {
+			if (!HWIF(drive)->irq)
+				(void) probe_irq_off(irqs);
+			return 1;	/* drive timed-out */
+		}
+		delay_10ms();		/* give drive a breather */
+	} while (IN_BYTE(hd_status) & BUSY_STAT);
+
+	delay_10ms();		/* wait for IRQ and DRQ_STAT */
+	if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
+		cli();			/* some systems need this */
+		do_identify(drive, cmd); /* drive returned ID */
+		if (drive->present && drive->media != ide_tape) {
+			ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
+			if (tuneproc != NULL && drive->autotune == 1)
+				tuneproc(drive, 255);	/* auto-tune PIO mode */
+		}
+		rc = 0;			/* drive responded with ID */
+	} else
+		rc = 2;			/* drive refused ID */
+	if (!HWIF(drive)->irq) {
+		irqs = probe_irq_off(irqs);	/* get irq number */
+		if (irqs > 0)
+			HWIF(drive)->irq = irqs;
+		else				/* Mmmm.. multiple IRQs */
+			printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
+	}
+	return rc;
+}
+
+/*
+ * do_probe() has the difficult job of finding a drive if it exists,
+ * without getting hung up if it doesn't exist, without trampling on
+ * ethernet cards, and without leaving any IRQs dangling to haunt us later.
+ *
+ * If a drive is "known" to exist (from CMOS or kernel parameters),
+ * but does not respond right away, the probe will "hang in there"
+ * for the maximum wait time (about 30 seconds), otherwise it will
+ * exit much more quickly.
+ *
+ * Returns:	0  device was identified
+ *		1  device timed-out (no response to identify request)
+ *		2  device aborted the command (refused to identify itself)
+ *		3  bad status from device (possible for ATAPI drives)
+ *		4  probe was not attempted because failure was obvious
+ */
+static int do_probe (ide_drive_t *drive, byte cmd)
+{
+	int rc;
+#ifdef CONFIG_BLK_DEV_IDEATAPI
+	if (drive->present) {	/* avoid waiting for inappropriate probes */
+		if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
+			return 4;
+	}
+#endif	/* CONFIG_BLK_DEV_IDEATAPI */
+#ifdef DEBUG
+	printk("probing for %s: present=%d, media=%d, probetype=%s\n",
+		drive->name, drive->present, drive->media,
+		(cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
+#endif
+#ifdef CONFIG_BLK_DEV_HT6560B
+	if (HWIF(drive)->selectproc)
+		HWIF(drive)->selectproc (drive);
+#endif /* CONFIG_BLK_DEV_HT6560B */
+	OUT_BYTE(drive->select.all,IDE_SELECT_REG);	/* select target drive */
+	delay_10ms();				/* wait for BUSY_STAT */
+	if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
+		OUT_BYTE(0xa0,IDE_SELECT_REG);	/* exit with drive0 selected */
+		return 3;    /* no i/f present: avoid killing ethernet cards */
+	}
+
+	if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
+	 || drive->present || cmd == WIN_PIDENTIFY)
+	{
+		if ((rc = try_to_identify(drive,cmd)))   /* send cmd and wait */
+			rc = try_to_identify(drive,cmd); /* failed: try again */
+		if (rc == 1)
+			printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
+		(void) GET_STAT();		/* ensure drive irq is clear */
+	} else {
+		rc = 3;				/* not present or maybe ATAPI */
+	}
+	if (drive->select.b.unit != 0) {
+		OUT_BYTE(0xa0,IDE_SELECT_REG);	/* exit with drive0 selected */
+		delay_10ms();
+		(void) GET_STAT();		/* ensure drive irq is clear */
+	}
+	return rc;
+}
+
+/*
+ * probe_for_drive() tests for existance of a given drive using do_probe().
+ *
+ * Returns:	0  no device was found
+ *		1  device was found (note: drive->present might still be 0)
+ */
+static inline byte probe_for_drive (ide_drive_t *drive)
+{
+	if (drive->noprobe)			/* skip probing? */
+		return drive->present;
+	if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
+#ifdef CONFIG_BLK_DEV_IDEATAPI
+		(void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
+#endif	/* CONFIG_BLK_DEV_IDEATAPI */
+	}
+	if (!drive->present)
+		return 0;			/* drive not found */
+	if (drive->id == NULL) {		/* identification failed? */
+		if (drive->media == ide_disk) {
+			printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
+			 drive->name, drive->cyl, drive->head, drive->sect);
+		}
+#ifdef CONFIG_BLK_DEV_IDECD
+		else if (drive->media == ide_cdrom) {
+			printk("%s: ATAPI cdrom (?)\n", drive->name);
+		}
+#endif	/* CONFIG_BLK_DEV_IDECD */
+		else {
+			drive->present = 0;	/* nuke it */
+			return 1;		/* drive was found */
+		}
+	}
+	if (drive->media == ide_disk && !drive->select.b.lba) {
+		if (!drive->head || drive->head > 16) {
+			printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
+			 drive->name, drive->head);
+			drive->present = 0;
+		}
+	}
+	return 1;	/* drive was found */
+}
+
+/*
+ *  This routine only knows how to look for drive units 0 and 1
+ *  on an interface, so any setting of MAX_DRIVES > 2 won't work here.
+ */
+static void probe_for_drives (ide_hwif_t *hwif)
+{
+	unsigned int unit;
+
+	if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
+		int msgout = 0;
+		for (unit = 0; unit < MAX_DRIVES; ++unit) {
+			ide_drive_t *drive = &hwif->drives[unit];
+			if (drive->present) {
+				drive->present = 0;
+				printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
+				msgout = 1;
+			}
+		}
+		if (!msgout)
+			printk("%s: ports already in use, skipping probe\n", hwif->name);
+	} else {
+		unsigned long flags;
+		save_flags(flags);
+
+#if (MAX_DRIVES > 2)
+		printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
+#endif
+		sti();	/* needed for jiffies and irq probing */
+		/*
+		 * Second drive should only exist if first drive was found,
+		 * but a lot of cdrom drives seem to be configured as slave-only
+		 */
+		for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
+			ide_drive_t *drive = &hwif->drives[unit];
+			(void) probe_for_drive (drive);
+		}
+		for (unit = 0; unit < MAX_DRIVES; ++unit) {
+			ide_drive_t *drive = &hwif->drives[unit];
+			if (drive->present) {
+				hwif->present = 1;
+				request_region(hwif->io_base,  8, hwif->name);
+				request_region(hwif->ctl_port, 1, hwif->name);
+				break;
+			}
+		}
+		restore_flags(flags);
+	}
+}
+
+/*
+ * stridx() returns the offset of c within s,
+ * or -1 if c is '\0' or not found within s.
+ */
+static int stridx (const char *s, char c)
+{
+	char *i = strchr(s, c);
+	return (i && c) ? i - s : -1;
+}
+
+/*
+ * match_parm() does parsing for ide_setup():
+ *
+ * 1. the first char of s must be '='.
+ * 2. if the remainder matches one of the supplied keywords,
+ *     the index (1 based) of the keyword is negated and returned.
+ * 3. if the remainder is a series of no more than max_vals numbers
+ *     separated by commas, the numbers are saved in vals[] and a
+ *     count of how many were saved is returned.  Base10 is assumed,
+ *     and base16 is allowed when prefixed with "0x".
+ * 4. otherwise, zero is returned.
+ */
+static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
+{
+	static const char *decimal = "0123456789";
+	static const char *hex = "0123456789abcdef";
+	int i, n;
+
+	if (*s++ == '=') {
+		/*
+		 * Try matching against the supplied keywords,
+		 * and return -(index+1) if we match one
+		 */
+		for (i = 0; *keywords != NULL; ++i) {
+			if (!strcmp(s, *keywords++))
+				return -(i+1);
+		}
+		/*
+		 * Look for a series of no more than "max_vals"
+		 * numeric values separated by commas, in base10,
+		 * or base16 when prefixed with "0x".
+		 * Return a count of how many were found.
+		 */
+		for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
+			vals[n] = i;
+			while ((i = stridx(decimal, *++s)) >= 0)
+				vals[n] = (vals[n] * 10) + i;
+			if (*s == 'x' && !vals[n]) {
+				while ((i = stridx(hex, *++s)) >= 0)
+					vals[n] = (vals[n] * 0x10) + i;
+			}
+			if (++n == max_vals)
+				break;
+			if (*s == ',')
+				++s;
+		}
+		if (!*s)
+			return n;
+	}
+	return 0;	/* zero = nothing matched */
+}
+
+/*
+ * ide_setup() gets called VERY EARLY during initialization,
+ * to handle kernel "command line" strings beginning with "hdx="
+ * or "ide".  Here is the complete set currently supported:
+ *
+ * "hdx="  is recognized for all "x" from "a" to "h", such as "hdc".
+ * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
+ *
+ * "hdx=noprobe"	: drive may be present, but do not probe for it
+ * "hdx=nowerr"		: ignore the WRERR_STAT bit on this drive
+ * "hdx=cdrom"		: drive is present, and is a cdrom drive
+ * "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
+ * "hdx=autotune"	: driver will attempt to tune interface speed
+ *				to the fastest PIO mode supported,
+ *				if possible for this drive only.
+ *				Not fully supported by all chipset types,
+ *				and quite likely to cause trouble with
+ *				older/odd IDE drives.
+ *
+ * "idex=noprobe"	: do not attempt to access/use this interface
+ * "idex=base"		: probe for an interface at the addr specified,
+ *				where "base" is usually 0x1f0 or 0x170
+ *				and "ctl" is assumed to be "base"+0x206
+ * "idex=base,ctl"	: specify both base and ctl
+ * "idex=base,ctl,irq"	: specify base, ctl, and irq number
+ * "idex=autotune"	: driver will attempt to tune interface speed
+ *				to the fastest PIO mode supported,
+ *				for all drives on this interface.
+ *				Not fully supported by all chipset types,
+ *				and quite likely to cause trouble with
+ *				older/odd IDE drives.
+ * "idex=noautotune"	: driver will NOT attempt to tune interface speed
+ *				This is the default for most chipsets,
+ *				except the cmd640.
+ *
+ * The following two are valid ONLY on ide0,
+ * and the defaults for the base,ctl ports must not be altered.
+ *
+ * "ide0=serialize"	: do not overlap operations on ide0 and ide1.
+ * "ide0=dtc2278"	: probe/support DTC2278 interface
+ * "ide0=ht6560b"	: probe/support HT6560B interface
+ * "ide0=cmd640_vlb"	: *REQUIRED* for VLB cards with the CMD640 chip
+ *			  (not for PCI -- automatically detected)
+ * "ide0=qd6580"	: probe/support qd6580 interface
+ * "ide0=ali14xx"	: probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
+ * "ide0=umc8672"	: probe/support umc8672 chipsets
+ */
+void ide_setup (char *s)
+{
+	int i, vals[3];
+	ide_hwif_t *hwif;
+	ide_drive_t *drive;
+	unsigned int hw, unit;
+	const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
+	const char max_hwif  = '0' + (MAX_HWIFS - 1);
+
+	printk("ide_setup: %s", s);
+	init_ide_data ();
+
+	/*
+	 * Look for drive options:  "hdx="
+	 */
+	if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
+		const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
+						"autotune", "noautotune", NULL};
+		unit = s[2] - 'a';
+		hw   = unit / MAX_DRIVES;
+		unit = unit % MAX_DRIVES;
+		hwif = &ide_hwifs[hw];
+		drive = &hwif->drives[unit];
+		switch (match_parm(&s[3], hd_words, vals, 3)) {
+			case -1: /* "noprobe" */
+				drive->noprobe = 1;
+				goto done;
+			case -2: /* "nowerr" */
+				drive->bad_wstat = BAD_R_STAT;
+				hwif->noprobe = 0;
+				goto done;
+			case -3: /* "cdrom" */
+				drive->present = 1;
+				drive->media = ide_cdrom;
+				hwif->noprobe = 0;
+				goto done;
+			case -4: /* "serialize" */
+				printk(" -- USE \"ide%c=serialize\" INSTEAD", '0'+hw);
+				goto do_serialize;
+			case -5: /* "autotune" */
+				drive->autotune = 1;
+				goto done;
+			case -6: /* "noautotune" */
+				drive->autotune = 2;
+				goto done;
+			case 3: /* cyl,head,sect */
+				drive->media	= ide_disk;
+				drive->cyl	= drive->bios_cyl  = vals[0];
+				drive->head	= drive->bios_head = vals[1];
+				drive->sect	= drive->bios_sect = vals[2];
+				drive->present	= 1;
+				drive->forced_geom = 1;
+				hwif->noprobe = 0;
+				goto done;
+			default:
+				goto bad_option;
+		}
+	}
+	/*
+	 * Look for interface options:  "idex="
+	 */
+	if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
+		/*
+		 * Be VERY CAREFUL changing this: note hardcoded indexes below
+		 */
+		const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
+			"qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", NULL};
+		hw = s[3] - '0';
+		hwif = &ide_hwifs[hw];
+		i = match_parm(&s[4], ide_words, vals, 3);
+
+		/*
+		 * Cryptic check to ensure chipset not already set for hwif:
+		 */
+		if (i != -1 && i != -2) {
+			if (hwif->chipset != ide_unknown)
+				goto bad_option;
+			if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
+				goto bad_option;
+		}
+		/*
+		 * Interface keywords work only for ide0:
+		 */
+		if (i <= -6 && hw != 0)
+			goto bad_hwif;
+
+		switch (i) {
+#ifdef CONFIG_BLK_DEV_ALI14XX
+			case -10: /* "ali14xx" */
+			{
+				extern void init_ali14xx (void);
+				init_ali14xx();
+				goto done;
+			}
+#endif /* CONFIG_BLK_DEV_ALI14XX */
+#ifdef CONFIG_BLK_DEV_UMC8672
+			case -9: /* "umc8672" */
+			{
+				extern void init_umc8672 (void);
+				init_umc8672();
+				goto done;
+			}
+#endif /* CONFIG_BLK_DEV_UMC8672 */
+#ifdef CONFIG_BLK_DEV_DTC2278
+			case -8: /* "dtc2278" */
+			{
+				extern void init_dtc2278 (void);
+				init_dtc2278();
+				goto done;
+			}
+#endif /* CONFIG_BLK_DEV_DTC2278 */
+#ifdef CONFIG_BLK_DEV_CMD640
+			case -7: /* "cmd640_vlb" */
+			{
+				extern int cmd640_vlb; /* flag for cmd640.c */
+				cmd640_vlb = 1;
+				goto done;
+			}
+#endif /* CONFIG_BLK_DEV_CMD640 */
+#ifdef CONFIG_BLK_DEV_HT6560B
+			case -6: /* "ht6560b" */
+			{
+				extern void init_ht6560b (void);
+				init_ht6560b();
+				goto done;
+			}
+#endif /* CONFIG_BLK_DEV_HT6560B */
+#if CONFIG_BLK_DEV_QD6580
+			case -5: /* "qd6580" (no secondary i/f) */
+			{
+				extern void init_qd6580 (void);
+				init_qd6580();
+				goto done;
+			}
+#endif /* CONFIG_BLK_DEV_QD6580 */
+			case -4: /* "noautotune" */
+				hwif->drives[0].autotune = 2;
+				hwif->drives[1].autotune = 2;
+				goto done;
+			case -3: /* "autotune" */
+				hwif->drives[0].autotune = 1;
+				hwif->drives[1].autotune = 1;
+				goto done;
+			case -2: /* "serialize" */
+			do_serialize:
+				if (hw > 1) goto bad_hwif;
+				ide_hwifs[0].serialized = 1;
+				goto done;
+
+			case -1: /* "noprobe" */
+				hwif->noprobe = 1;
+				goto done;
+
+			case 1:	/* base */
+				vals[1] = vals[0] + 0x206; /* default ctl */
+			case 2: /* base,ctl */
+				vals[2] = 0;	/* default irq = probe for it */
+			case 3: /* base,ctl,irq */
+				hwif->io_base  = vals[0];
+				hwif->ctl_port = vals[1];
+				hwif->irq      = vals[2];
+				hwif->noprobe  = 0;
+				hwif->chipset  = ide_generic;
+				goto done;
+
+			case 0: goto bad_option;
+			default:
+				printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
+				return;
+		}
+	}
+bad_option:
+	printk(" -- BAD OPTION\n");
+	return;
+bad_hwif:
+	printk("-- NOT SUPPORTED ON ide%d", hw);
+done:
+	printk("\n");
+}
+
+/*
+ * This routine is called from the partition-table code in genhd.c
+ * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
+ *
+ * The second parameter, "xparm", determines exactly how the translation 
+ * will be handled:
+ *		 0 = convert to CHS with fewer than 1024 cyls
+ *			using the same method as Ontrack DiskManager.
+ *		 1 = same as "0", plus offset everything by 63 sectors.
+ *		-1 = similar to "0", plus redirect sector 0 to sector 1.
+ *		>1 = convert to a CHS geometry with "xparm" heads.
+ *
+ * Returns 0 if the translation was not possible, if the device was not 
+ * an IDE disk drive, or if a geometry was "forced" on the commandline.
+ * Returns 1 if the geometry translation was successful.
+ */
+int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
+{
+	ide_drive_t *drive;
+	static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
+	const byte *heads = head_vals;
+	unsigned long tracks;
+
+	if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
+		return 0;
+
+	if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
+		return 0;		/* we already have a translation */
+
+	printk("%s ", msg);
+
+	if (drive->id) {
+		drive->cyl  = drive->id->cyls;
+		drive->head = drive->id->heads;
+		drive->sect = drive->id->sectors;
+	}
+	drive->bios_cyl  = drive->cyl;
+	drive->bios_head = drive->head;
+	drive->bios_sect = drive->sect;
+	drive->special.b.set_geometry = 1;
+
+	tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
+	drive->bios_sect = 63;
+	if (xparm > 1) {
+		drive->bios_head = xparm;
+		drive->bios_cyl = tracks / drive->bios_head;
+	} else {
+		while (drive->bios_cyl >= 1024) {
+			drive->bios_head = *heads;
+			drive->bios_cyl = tracks / drive->bios_head;
+			if (0 == *++heads)
+				break;
+		}
+#if FAKE_FDISK_FOR_EZDRIVE
+		if (xparm == -1) {
+			drive->remap_0_to_1 = 1;
+			msg = "0->1";
+		} else
+#endif /* FAKE_FDISK_FOR_EZDRIVE */
+		if (xparm == 1) {
+			drive->sect0 = 63;
+			drive->bios_cyl = (tracks - 1) / drive->bios_head;
+			msg = "+63";
+		}
+		printk("[remap %s] ", msg);
+	}
+	drive->part[0].nr_sects = current_capacity(drive);
+	printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
+	return 1;
+}
+
+/*
+ * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
+ * controller that is BIOS compatible with ST-506, and thus showing up in our
+ * BIOS table, but not register compatible, and therefore not present in CMOS.
+ *
+ * Furthermore, we will assume that our ST-506 drives <if any> are the primary
+ * drives in the system -- the ones reflected as drive 1 or 2.  The first
+ * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
+ * nibble.  This will be either a 4 bit drive type or 0xf indicating use byte
+ * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS.  A non-zero value
+ * means we have an AT controller hard disk for that drive.
+ *
+ * Of course, there is no guarantee that either drive is actually on the
+ * "primary" IDE interface, but we don't bother trying to sort that out here.
+ * If a drive is not actually on the primary interface, then these parameters
+ * will be ignored.  This results in the user having to supply the logical
+ * drive geometry as a boot parameter for each drive not on the primary i/f.
+ *
+ * The only "perfect" way to handle this would be to modify the setup.[cS] code
+ * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
+ * for us during initialization.  I have the necessary docs -- any takers?  -ml
+ */
+
+static void probe_cmos_for_drives (ide_hwif_t *hwif)
+{
+#ifdef __i386__
+	extern struct drive_info_struct drive_info;
+	byte cmos_disks, *BIOS = (byte *) &drive_info;
+	int unit;
+
+	outb_p(0x12,0x70);		/* specify CMOS address 0x12 */
+	cmos_disks = inb_p(0x71);	/* read the data from 0x12 */
+	/* Extract drive geometry from CMOS+BIOS if not already setup */
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t *drive = &hwif->drives[unit];
+		if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
+			drive->cyl   = drive->bios_cyl  = *(unsigned short *)BIOS;
+			drive->head  = drive->bios_head = *(BIOS+2);
+			drive->sect  = drive->bios_sect = *(BIOS+14);
+			drive->ctl   = *(BIOS+8);
+			drive->present = 1;
+		}
+		BIOS += 16;
+	}
+#endif
+}
+
+/*
+ * This routine sets up the irq for an ide interface, and creates a new
+ * hwgroup for the irq/hwif if none was previously assigned.
+ *
+ * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
+ * interrupts completely disabled.  This can be bad for interrupt latency,
+ * but anything else has led to problems on some machines.  We re-enable
+ * interrupts as much as we can safely do in most places.
+ */
+static int init_irq (ide_hwif_t *hwif)
+{
+	unsigned long flags;
+	int irq = hwif->irq;
+	ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
+
+	save_flags(flags);
+	cli();
+
+	/*
+	 * Grab the irq if we don't already have it from a previous hwif
+	 */
+	if (hwgroup == NULL)  {
+		if (request_irq(irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
+			restore_flags(flags);
+			printk(" -- FAILED!");
+			return 1;
+		}
+	}
+	/*
+	 * Check for serialization with ide1.
+	 * This code depends on us having already taken care of ide1.
+	 */
+	if (hwif->serialized && hwif->name[3] == '0' && ide_hwifs[1].present)
+		hwgroup = ide_hwifs[1].hwgroup;
+	/*
+	 * If this is the first interface in a group,
+	 * then we need to create the hwgroup structure
+	 */
+	if (hwgroup == NULL) {
+		hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
+		hwgroup->hwif 	 = hwif->next = hwif;
+		hwgroup->rq      = NULL;
+		hwgroup->handler = NULL;
+		hwgroup->drive   = &hwif->drives[0];
+		hwgroup->poll_timeout = 0;
+		init_timer(&hwgroup->timer);
+		hwgroup->timer.function = &timer_expiry;
+		hwgroup->timer.data = (unsigned long) hwgroup;
+	} else {
+		hwif->next = hwgroup->hwif->next;
+		hwgroup->hwif->next = hwif;
+	}
+	hwif->hwgroup = hwgroup;
+	irq_to_hwgroup[irq] = hwgroup;
+
+	restore_flags(flags);	/* safe now that hwif->hwgroup is set up */
+
+	printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
+		hwif->io_base, hwif->io_base+7, hwif->ctl_port, irq);
+	if (hwgroup->hwif != hwif)
+		printk(" (serialized with %s)", hwgroup->hwif->name);
+	printk("\n");
+	return 0;
+}
+
+static struct file_operations ide_fops = {
+	NULL,			/* lseek - default */
+	block_read,		/* read - general block-dev read */
+	block_write,		/* write - general block-dev write */
+	NULL,			/* readdir - bad */
+	NULL,			/* select */
+	ide_ioctl,		/* ioctl */
+	NULL,			/* mmap */
+	ide_open,		/* open */
+	ide_release,		/* release */
+	block_fsync		/* fsync */
+	,NULL,			/* fasync */
+	ide_check_media_change,	/* check_media_change */
+	revalidate_disk		/* revalidate */
+};
+
+#ifdef CONFIG_PCI
+#if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
+
+typedef void (ide_pci_init_proc_t)(byte, byte);
+
+/*
+ * ide_probe_pci() scans PCI for a specific vendor/device function,
+ * and invokes the supplied init routine for each instance detected.
+ */
+static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
+{
+	unsigned long flags;
+	unsigned index;
+	byte fn, bus;
+
+	save_flags(flags);
+	cli();
+	for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
+		init (bus, fn + func_adj);
+	}
+	restore_flags(flags);
+}
+
+#endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
+#endif /* CONFIG_PCI */
+
+/*
+ * ide_init_pci() finds/initializes "known" PCI IDE interfaces
+ *
+ * This routine should ideally be using pcibios_find_class() to find
+ * all IDE interfaces, but that function causes some systems to "go weird".
+ */
+static void probe_for_hwifs (void)
+{
+#ifdef CONFIG_PCI
+	/*
+	 * Find/initialize PCI IDE interfaces
+	 */
+	if (pcibios_present()) {
+#ifdef CONFIG_BLK_DEV_RZ1000
+		ide_pci_init_proc_t init_rz1000;
+		ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
+#endif /* CONFIG_BLK_DEV_RZ1000 */
+#ifdef CONFIG_BLK_DEV_TRITON
+		/*
+		 * Apparently the BIOS32 services on Intel motherboards are
+		 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
+		 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
+		 * and then add 1.
+		 */
+		ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
+#endif /* CONFIG_BLK_DEV_TRITON */
+	}
+#endif /* CONFIG_PCI */
+#ifdef CONFIG_BLK_DEV_CMD640
+	{
+		extern void ide_probe_for_cmd640x (void);
+		ide_probe_for_cmd640x();
+	}
+#endif
+}
+
+/*
+ * This is gets invoked once during initialization, to set *everything* up
+ */
+int ide_init (void)
+{
+	int h;
+
+	init_ide_data ();
+	/*
+	 * Probe for special "known" interface chipsets
+	 */
+	probe_for_hwifs ();
+
+	/*
+	 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
+	 */
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		ide_hwif_t *hwif = &ide_hwifs[h];
+		if (!hwif->noprobe) {
+			if (hwif->io_base == HD_DATA)
+				probe_cmos_for_drives (hwif);
+			probe_for_drives (hwif);
+		}
+		if (hwif->present) {
+			if (!hwif->irq) {
+				if (!(hwif->irq = default_irqs[h])) {
+					printk("%s: DISABLED, NO IRQ\n", hwif->name);
+					hwif->present = 0;
+					continue;
+				}
+			}
+#ifdef CONFIG_BLK_DEV_HD
+			if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
+				printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
+				hwif->present = 0;
+			}
+#endif /* CONFIG_BLK_DEV_HD */
+		}
+	}
+
+	/*
+	 * Now we try to set up irqs and major devices for what was found
+	 */
+	for (h = MAX_HWIFS-1; h >= 0; --h) {
+		void (*rfn)(void);
+		ide_hwif_t *hwif = &ide_hwifs[h];
+		if (!hwif->present)
+			continue;
+		hwif->present = 0; /* we set it back to 1 if all is ok below */
+		switch (hwif->major) {
+			case IDE0_MAJOR: rfn = &do_ide0_request; break;
+			case IDE1_MAJOR: rfn = &do_ide1_request; break;
+			case IDE2_MAJOR: rfn = &do_ide2_request; break;
+			case IDE3_MAJOR: rfn = &do_ide3_request; break;
+			default:
+				printk("%s: request_fn NOT DEFINED\n", hwif->name);
+				continue;
+		}
+		if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
+			printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
+		} else if (init_irq (hwif)) {
+			printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
+			(void) unregister_blkdev (hwif->major, hwif->name);
+		} else {
+			init_gendisk(hwif);
+			blk_dev[hwif->major].request_fn = rfn;
+			read_ahead[hwif->major] = 8;	/* (4kB) */
+			hwif->present = 1;	/* success */
+		}
+	}
+
+#ifdef CONFIG_BLK_DEV_IDETAPE
+	idetape_register_chrdev();	/* Register character device interface to the ide tape */
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+	
+	return 0;
+}
diff --git a/i386/i386at/gpl/linux/block/ide.h b/i386/i386at/gpl/linux/block/ide.h
new file mode 100644
index 0000000..b1ebc4c
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/ide.h
@@ -0,0 +1,655 @@
+/*
+ *  linux/drivers/block/ide.h
+ *
+ *  Copyright (C) 1994, 1995  Linus Torvalds & authors
+ */
+
+#include <linux/config.h>
+
+/*
+ * This is the multiple IDE interface driver, as evolved from hd.c.  
+ * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
+ * There can be up to two drives per interface, as per the ATA-2 spec.
+ *
+ * Primary i/f:    ide0: major=3;  (hda)         minor=0; (hdb)         minor=64
+ * Secondary i/f:  ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
+ * Tertiary i/f:   ide2: major=33; (hde)         minor=0; (hdf)         minor=64
+ * Quaternary i/f: ide3: major=34; (hdg)         minor=0; (hdh)         minor=64
+ */
+
+/******************************************************************************
+ * IDE driver configuration options (play with these as desired):
+ * 
+ * REALLY_SLOW_IO can be defined in ide.c and ide-cd.c, if necessary
+ */
+#undef REALLY_FAST_IO			/* define if ide ports are perfect */
+#define INITIAL_MULT_COUNT	0	/* off=0; on=2,4,8,16,32, etc.. */
+
+#ifndef SUPPORT_VLB_SYNC		/* 1 to support weird 32-bit chips */
+#define SUPPORT_VLB_SYNC	1	/* 0 to reduce kernel size */
+#endif
+#ifndef DISK_RECOVERY_TIME		/* off=0; on=access_delay_time */
+#define DISK_RECOVERY_TIME	0	/*  for hardware that needs it */
+#endif
+#ifndef OK_TO_RESET_CONTROLLER		/* 1 needed for good error recovery */
+#define OK_TO_RESET_CONTROLLER	1	/* 0 for use with AH2372A/B interface */
+#endif
+#ifndef FAKE_FDISK_FOR_EZDRIVE		/* 1 to help linux fdisk with EZDRIVE */
+#define FAKE_FDISK_FOR_EZDRIVE 	1	/* 0 to reduce kernel size */
+#endif
+#ifndef FANCY_STATUS_DUMPS		/* 1 for human-readable drive errors */
+#define FANCY_STATUS_DUMPS	1	/* 0 to reduce kernel size */
+#endif
+
+#if defined(CONFIG_BLK_DEV_IDECD) || defined(CONFIG_BLK_DEV_IDETAPE)
+#define CONFIG_BLK_DEV_IDEATAPI 1
+#endif
+
+/*
+ * IDE_DRIVE_CMD is used to implement many features of the hdparm utility
+ */
+#define IDE_DRIVE_CMD		99	/* (magic) undef to reduce kernel size*/
+
+/*
+ *  "No user-serviceable parts" beyond this point  :)
+ *****************************************************************************/
+
+typedef unsigned char	byte;	/* used everywhere */
+
+/*
+ * Probably not wise to fiddle with these
+ */
+#define ERROR_MAX	8	/* Max read/write errors per sector */
+#define ERROR_RESET	3	/* Reset controller every 4th retry */
+#define ERROR_RECAL	1	/* Recalibrate every 2nd retry */
+
+/*
+ * Ensure that various configuration flags have compatible settings
+ */
+#ifdef REALLY_SLOW_IO
+#undef REALLY_FAST_IO
+#endif
+
+/*
+ * Definitions for accessing IDE controller registers
+ */
+
+#define HWIF(drive)		((ide_hwif_t *)drive->hwif)
+#define HWGROUP(drive)		((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
+
+#define IDE_DATA_OFFSET		(0)
+#define IDE_ERROR_OFFSET	(1)
+#define IDE_NSECTOR_OFFSET	(2)
+#define IDE_SECTOR_OFFSET	(3)
+#define IDE_LCYL_OFFSET		(4)
+#define IDE_HCYL_OFFSET		(5)
+#define IDE_SELECT_OFFSET	(6)
+#define IDE_STATUS_OFFSET	(7)
+#define IDE_FEATURE_OFFSET	IDE_ERROR_OFFSET
+#define IDE_COMMAND_OFFSET	IDE_STATUS_OFFSET
+
+#define IDE_DATA_REG		(HWIF(drive)->io_base+IDE_DATA_OFFSET)
+#define IDE_ERROR_REG		(HWIF(drive)->io_base+IDE_ERROR_OFFSET)
+#define IDE_NSECTOR_REG		(HWIF(drive)->io_base+IDE_NSECTOR_OFFSET)
+#define IDE_SECTOR_REG		(HWIF(drive)->io_base+IDE_SECTOR_OFFSET)
+#define IDE_LCYL_REG		(HWIF(drive)->io_base+IDE_LCYL_OFFSET)
+#define IDE_HCYL_REG		(HWIF(drive)->io_base+IDE_HCYL_OFFSET)
+#define IDE_SELECT_REG		(HWIF(drive)->io_base+IDE_SELECT_OFFSET)
+#define IDE_STATUS_REG		(HWIF(drive)->io_base+IDE_STATUS_OFFSET)
+#define IDE_CONTROL_REG		(HWIF(drive)->ctl_port)
+#define IDE_FEATURE_REG		IDE_ERROR_REG
+#define IDE_COMMAND_REG		IDE_STATUS_REG
+#define IDE_ALTSTATUS_REG	IDE_CONTROL_REG
+
+#ifdef REALLY_FAST_IO
+#define OUT_BYTE(b,p)		outb((b),p)
+#define IN_BYTE(p)		(byte)inb(p)
+#else
+#define OUT_BYTE(b,p)		outb_p((b),p)
+#define IN_BYTE(p)		(byte)inb_p(p)
+#endif /* REALLY_FAST_IO */
+
+#define GET_ERR()		IN_BYTE(IDE_ERROR_REG)
+#define GET_STAT()		IN_BYTE(IDE_STATUS_REG)
+#define OK_STAT(stat,good,bad)	(((stat)&((good)|(bad)))==(good))
+#define BAD_R_STAT		(BUSY_STAT   | ERR_STAT)
+#define BAD_W_STAT		(BAD_R_STAT  | WRERR_STAT)
+#define BAD_STAT		(BAD_R_STAT  | DRQ_STAT)
+#define DRIVE_READY		(READY_STAT  | SEEK_STAT)
+#define DATA_READY		(DRIVE_READY | DRQ_STAT)
+
+/*
+ * Some more useful definitions
+ */
+#define IDE_MAJOR_NAME	"ide"	/* the same for all i/f; see also genhd.c */
+#define MAJOR_NAME	IDE_MAJOR_NAME
+#define PARTN_BITS	6	/* number of minor dev bits for partitions */
+#define PARTN_MASK	((1<<PARTN_BITS)-1)	/* a useful bit mask */
+#define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */
+#define MAX_HWIFS	4	/* an arbitrary, but realistic limit */
+#define SECTOR_WORDS	(512 / 4)	/* number of 32bit words per sector */
+
+/*
+ * Timeouts for various operations:
+ */
+#define WAIT_DRQ	(5*HZ/100)	/* 50msec - spec allows up to 20ms */
+#define WAIT_READY	(3*HZ/100)	/* 30msec - should be instantaneous */
+#define WAIT_PIDENTIFY	(1*HZ)	/* 1sec   - should be less than 3ms (?) */
+#define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
+#define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */
+
+#ifdef CONFIG_BLK_DEV_IDETAPE
+#include "ide-tape.h"
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+
+#ifdef CONFIG_BLK_DEV_IDECD
+
+struct atapi_request_sense {
+  unsigned char error_code : 7;
+  unsigned char valid      : 1;
+  byte reserved1;
+  unsigned char sense_key  : 4;
+  unsigned char reserved2  : 1;
+  unsigned char ili        : 1;
+  unsigned char reserved3  : 2;
+  byte info[4];
+  byte sense_len;
+  byte command_info[4];
+  byte asc;
+  byte ascq;
+  byte fru;
+  byte sense_key_specific[3];
+};
+
+struct packet_command {
+  char *buffer;
+  int buflen;
+  int stat;
+  struct atapi_request_sense *sense_data;
+  unsigned char c[12];
+};
+
+/* Space to hold the disk TOC. */
+
+#define MAX_TRACKS 99
+struct atapi_toc_header {
+  unsigned short toc_length;
+  byte first_track;
+  byte last_track;
+};
+
+struct atapi_toc_entry {
+  byte reserved1;
+  unsigned control : 4;
+  unsigned adr     : 4;
+  byte track;
+  byte reserved2;
+  union {
+    unsigned lba;
+    struct {
+      byte reserved3;
+      byte m;
+      byte s;
+      byte f;
+    } msf;
+  } addr;
+};
+
+struct atapi_toc {
+  int    last_session_lba;
+  int    xa_flag;
+  unsigned capacity;
+  struct atapi_toc_header hdr;
+  struct atapi_toc_entry  ent[MAX_TRACKS+1];  /* One extra for the leadout. */
+};
+
+
+/* This structure is annoyingly close to, but not identical with,
+   the cdrom_subchnl structure from cdrom.h. */
+struct atapi_cdrom_subchnl 
+{
+  u_char  acdsc_reserved;
+  u_char  acdsc_audiostatus;
+  u_short acdsc_length;
+  u_char  acdsc_format;
+
+  u_char  acdsc_adr:	4;
+  u_char  acdsc_ctrl:	4;
+  u_char  acdsc_trk;
+  u_char  acdsc_ind;
+  union
+  {
+    struct 			
+    {
+      u_char	minute;
+      u_char	second;
+      u_char	frame;
+    } msf;
+    int	lba;
+  } acdsc_absaddr;
+  union 
+  {
+    struct 
+    {
+      u_char	minute;
+      u_char	second;
+      u_char	frame;
+    } msf;
+    int	lba;
+  } acdsc_reladdr;
+};
+
+
+/* Extra per-device info for cdrom drives. */
+struct cdrom_info {
+
+  /* Buffer for table of contents.  NULL if we haven't allocated
+     a TOC buffer for this device yet. */
+
+  struct atapi_toc *toc;
+
+  /* Sector buffer.  If a read request wants only the first part of a cdrom
+     block, we cache the rest of the block here, in the expectation that that
+     data is going to be wanted soon.  SECTOR_BUFFERED is the number of the
+     first buffered sector, and NSECTORS_BUFFERED is the number of sectors
+     in the buffer.  Before the buffer is allocated, we should have
+     SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */
+
+  unsigned long sector_buffered;
+  unsigned long nsectors_buffered;
+  char *sector_buffer;
+
+  /* The result of the last successful request sense command
+     on this device. */
+  struct atapi_request_sense sense_data;
+};
+
+#endif /* CONFIG_BLK_DEV_IDECD */
+
+/*
+ * Now for the data we need to maintain per-drive:  ide_drive_t
+ */
+
+typedef enum {ide_disk, ide_cdrom, ide_tape} ide_media_t;
+
+typedef union {
+	unsigned all			: 8;	/* all of the bits together */
+	struct {
+		unsigned set_geometry	: 1;	/* respecify drive geometry */
+		unsigned recalibrate	: 1;	/* seek to cyl 0      */
+		unsigned set_multmode	: 1;	/* set multmode count */
+		unsigned set_pio	: 1;	/* set pio mode */
+		unsigned reserved	: 4;	/* unused */
+		} b;
+	} special_t;
+
+typedef union {
+	unsigned all			: 8;	/* all of the bits together */
+	struct {
+		unsigned head		: 4;	/* always zeros here */
+		unsigned unit		: 1;	/* drive select number, 0 or 1 */
+		unsigned bit5		: 1;	/* always 1 */
+		unsigned lba		: 1;	/* using LBA instead of CHS */
+		unsigned bit7		: 1;	/* always 1 */
+	} b;
+	} select_t;
+
+typedef struct ide_drive_s {
+	special_t	special;	/* special action flags */
+	unsigned present	: 1;	/* drive is physically present */
+	unsigned noprobe 	: 1;	/* from:  hdx=noprobe */
+	unsigned keep_settings  : 1;	/* restore settings after drive reset */
+	unsigned busy		: 1;	/* currently doing revalidate_disk() */
+	unsigned removeable	: 1;	/* 1 if need to do check_media_change */
+	unsigned using_dma	: 1;	/* disk is using dma for read/write */
+	unsigned forced_geom	: 1;	/* 1 if hdx=c,h,s was given at boot */
+	unsigned unmask		: 1;	/* flag: okay to unmask other irqs */
+	unsigned autotune	: 2;	/* 1=autotune, 2=noautotune, 0=default */
+#if FAKE_FDISK_FOR_EZDRIVE
+	unsigned remap_0_to_1	: 1;	/* flag: partitioned with ezdrive */
+#endif /* FAKE_FDISK_FOR_EZDRIVE */
+	ide_media_t	media;		/* disk, cdrom, tape */
+	select_t	select;		/* basic drive/head select reg value */
+	byte		ctl;		/* "normal" value for IDE_CONTROL_REG */
+	byte		ready_stat;	/* min status value for drive ready */
+	byte		mult_count;	/* current multiple sector setting */
+	byte 		mult_req;	/* requested multiple sector setting */
+	byte 		pio_req;	/* requested multiple sector setting */
+	byte		io_32bit;	/* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
+	byte		bad_wstat;	/* used for ignoring WRERR_STAT */
+	byte		sect0;		/* offset of first sector for DM6:DDO */
+	byte 		usage;		/* current "open()" count for drive */
+	byte 		head;		/* "real" number of heads */
+	byte		sect;		/* "real" sectors per track */
+	byte		bios_head;	/* BIOS/fdisk/LILO number of heads */
+	byte		bios_sect;	/* BIOS/fdisk/LILO sectors per track */
+	unsigned short	bios_cyl;	/* BIOS/fdisk/LILO number of cyls */
+	unsigned short	cyl;		/* "real" number of cyls */
+	void		  *hwif;	/* actually (ide_hwif_t *) */
+	struct wait_queue *wqueue;	/* used to wait for drive in open() */
+	struct hd_driveid *id;		/* drive model identification info */
+	struct hd_struct  *part;	/* drive partition table */
+	char		name[4];	/* drive name, such as "hda" */
+#ifdef CONFIG_BLK_DEV_IDECD
+	struct cdrom_info cdrom_info;	/* for ide-cd.c */
+#endif /* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+	idetape_tape_t	tape;		/* for ide-tape.c */
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+
+	} ide_drive_t;
+
+/*
+ * An ide_dmaproc_t() initiates/aborts DMA read/write operations on a drive.
+ *
+ * The caller is assumed to have selected the drive and programmed the drive's
+ * sector address using CHS or LBA.  All that remains is to prepare for DMA
+ * and then issue the actual read/write DMA/PIO command to the drive.
+ *
+ * Returns 0 if all went well.
+ * Returns 1 if DMA read/write could not be started, in which case the caller
+ * should either try again later, or revert to PIO for the current request.
+ */
+typedef enum {	ide_dma_read = 0,	ide_dma_write = 1,
+		ide_dma_abort = 2,	ide_dma_check = 3,
+		ide_dma_status_bad = 4,	ide_dma_transferred = 5,
+		ide_dma_begin = 6 }
+	ide_dma_action_t;
+
+typedef int (ide_dmaproc_t)(ide_dma_action_t, ide_drive_t *);
+
+
+/*
+ * An ide_tuneproc_t() is used to set the speed of an IDE interface
+ * to a particular PIO mode.  The "byte" parameter is used
+ * to select the PIO mode by number (0,1,2,3,4,5), and a value of 255
+ * indicates that the interface driver should "auto-tune" the PIO mode
+ * according to the drive capabilities in drive->id;
+ *
+ * Not all interface types support tuning, and not all of those
+ * support all possible PIO settings.  They may silently ignore
+ * or round values as they see fit.
+ */
+typedef void (ide_tuneproc_t)(ide_drive_t *, byte);
+
+/*
+ * This is used to provide HT6560B interface support.
+ * It will probably also be used by the DC4030VL driver.
+ */
+typedef void (ide_selectproc_t) (ide_drive_t *);
+
+/*
+ * hwif_chipset_t is used to keep track of the specific hardware
+ * chipset used by each IDE interface, if known.
+ */
+typedef enum {	ide_unknown,	ide_generic,	ide_triton,
+		ide_cmd640,	ide_dtc2278,	ide_ali14xx,
+		ide_qd6580,	ide_umc8672,	ide_ht6560b }
+	hwif_chipset_t;
+
+typedef struct hwif_s {
+	struct hwif_s	*next;		/* for linked-list in ide_hwgroup_t */
+	void		*hwgroup;	/* actually (ide_hwgroup_t *) */
+	unsigned short	io_base;	/* base io port addr */
+	unsigned short	ctl_port;	/* usually io_base+0x206 */
+	ide_drive_t	drives[MAX_DRIVES];	/* drive info */
+	struct gendisk	*gd;		/* gendisk structure */
+	ide_tuneproc_t	*tuneproc;	/* routine to tune PIO mode for drives */
+#ifdef CONFIG_BLK_DEV_HT6560B
+	ide_selectproc_t *selectproc;	/* tweaks hardware to select drive */
+#endif /* CONFIG_BLK_DEV_HT6560B */
+	ide_dmaproc_t	*dmaproc;	/* dma read/write/abort routine */
+	unsigned long	*dmatable;	/* dma physical region descriptor table */
+	unsigned short	dma_base;	/* base addr for dma ports (triton) */
+	byte		irq;		/* our irq number */
+	byte		major;		/* our major number */
+	char 		name[5];	/* name of interface, eg. "ide0" */
+	byte		index;		/* 0 for ide0; 1 for ide1; ... */
+	hwif_chipset_t	chipset;	/* sub-module for tuning.. */
+	unsigned	noprobe : 1;	/* don't probe for this interface */
+	unsigned	present : 1;	/* this interface exists */
+	unsigned	serialized : 1;	/* valid only for ide_hwifs[0] */
+	unsigned	no_unmask : 1;	/* disallow setting unmask bits */
+#if (DISK_RECOVERY_TIME > 0)
+	unsigned long	last_time;	/* time when previous rq was done */
+#endif
+#ifdef CONFIG_BLK_DEV_IDECD
+	struct request request_sense_request;	/* from ide-cd.c */
+	struct packet_command request_sense_pc;	/* from ide-cd.c */
+#endif /* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+	ide_drive_t	*tape_drive;	/* Pointer to the tape on this interface */
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+	} ide_hwif_t;
+
+/*
+ *  internal ide interrupt handler type
+ */
+typedef void (ide_handler_t)(ide_drive_t *);
+
+typedef struct hwgroup_s {
+	ide_handler_t		*handler;/* irq handler, if active */
+	ide_drive_t		*drive;	/* current drive */
+	ide_hwif_t		*hwif;	/* ptr to current hwif in linked-list */
+	struct request		*rq;	/* current request */
+	struct timer_list	timer;	/* failsafe timer */
+	struct request		wrq;	/* local copy of current write rq */
+	unsigned long		poll_timeout;	/* timeout value during long polls */
+	} ide_hwgroup_t;
+
+/*
+ * ide_hwifs[] is the master data structure used to keep track
+ * of just about everything in ide.c.  Whenever possible, routines
+ * should be using pointers to a drive (ide_drive_t *) or 
+ * pointers to a hwif (ide_hwif_t *), rather than indexing this
+ * structure directly (the allocation/layout may change!).
+ */
+#ifdef _IDE_C
+	ide_hwif_t	ide_hwifs[MAX_HWIFS];	/* master data repository */
+#else
+extern	ide_hwif_t	ide_hwifs[];
+#endif
+
+/*
+ * One final include file, which references some of the data/defns from above
+ */
+#define IDE_DRIVER	/* "parameter" for blk.h */
+#include <linux/blk.h>
+
+#if (DISK_RECOVERY_TIME > 0)
+void ide_set_recovery_timer (ide_hwif_t *);
+#define SET_RECOVERY_TIMER(drive) ide_set_recovery_timer (drive)
+#else
+#define SET_RECOVERY_TIMER(drive)
+#endif
+
+/*
+ * This is used for (nearly) all data transfers from the IDE interface
+ */
+void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
+
+/*
+ * This is used for (nearly) all data transfers to the IDE interface
+ */
+void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount);
+
+/*
+ * This is used on exit from the driver, to designate the next irq handler
+ * and also to start the safety timer.
+ */
+void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout);
+
+/*
+ * Error reporting, in human readable form (luxurious, but a memory hog).
+ */
+byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat);
+
+/*
+ * ide_error() takes action based on the error returned by the controller.
+ * The calling function must return afterwards, to restart the request.
+ */
+void ide_error (ide_drive_t *drive, const char *msg, byte stat);
+
+/*
+ * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
+ * removing leading/trailing blanks and compressing internal blanks.
+ * It is primarily used to tidy up the model name/number fields as
+ * returned by the WIN_[P]IDENTIFY commands.
+ */
+void ide_fixstring (byte *s, const int bytecount, const int byteswap);
+
+/*
+ * This routine busy-waits for the drive status to be not "busy".
+ * It then checks the status for all of the "good" bits and none
+ * of the "bad" bits, and if all is okay it returns 0.  All other
+ * cases return 1 after invoking ide_error() -- caller should return.
+ *
+ */
+int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout);
+
+/*
+ * This routine is called from the partition-table code in genhd.c
+ * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
+ *
+ * The second parameter, "xparm", determines exactly how the translation
+ * will be handled:
+ *		 0 = convert to CHS with fewer than 1024 cyls
+ *			using the same method as Ontrack DiskManager.
+ *		 1 = same as "0", plus offset everything by 63 sectors.
+ *		-1 = similar to "0", plus redirect sector 0 to sector 1.
+ *		>1 = convert to a CHS geometry with "xparm" heads.
+ *
+ * Returns 0 if the translation was not possible, if the device was not
+ * an IDE disk drive, or if a geometry was "forced" on the commandline.
+ * Returns 1 if the geometry translation was successful.
+ */
+int ide_xlate_1024 (kdev_t, int, const char *);
+
+/*
+ * Start a reset operation for an IDE interface.
+ * The caller should return immediately after invoking this.
+ */
+void ide_do_reset (ide_drive_t *);
+
+/*
+ * This function is intended to be used prior to invoking ide_do_drive_cmd().
+ */
+void ide_init_drive_cmd (struct request *rq);
+
+/*
+ * "action" parameter type for ide_do_drive_cmd() below.
+ */
+typedef enum
+	{ide_wait,	/* insert rq at end of list, and wait for it */
+	 ide_next,	/* insert rq immediately after current request */
+	 ide_preempt,	/* insert rq in front of current request */
+	 ide_end}	/* insert rq at end of list, but don't wait for it */
+ ide_action_t;
+
+/*
+ * This function issues a special IDE device request
+ * onto the request queue.
+ *
+ * If action is ide_wait, then then rq is queued at the end of
+ * the request queue, and the function sleeps until it has been
+ * processed.  This is for use when invoked from an ioctl handler.
+ *
+ * If action is ide_preempt, then the rq is queued at the head of
+ * the request queue, displacing the currently-being-processed
+ * request and this function returns immediately without waiting
+ * for the new rq to be completed.  This is VERY DANGEROUS, and is
+ * intended for careful use by the ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_next, then the rq is queued immediately after
+ * the currently-being-processed-request (if any), and the function
+ * returns without waiting for the new rq to be completed.  As above,
+ * This is VERY DANGEROUS, and is intended for careful use by the 
+ * ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_end, then the rq is queued at the end of the
+ * request queue, and the function returns immediately without waiting
+ * for the new rq to be completed. This is again intended for careful
+ * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
+ * when operating in the pipelined operation mode).
+ */
+int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action);
+ 
+/*
+ * Clean up after success/failure of an explicit drive cmd.
+ * stat/err are used only when (HWGROUP(drive)->rq->cmd == IDE_DRIVE_CMD).
+ */
+void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err);
+
+#ifdef CONFIG_BLK_DEV_IDECD
+/*
+ * These are routines in ide-cd.c invoked from ide.c
+ */
+void ide_do_rw_cdrom (ide_drive_t *, unsigned long);
+int ide_cdrom_ioctl (ide_drive_t *, struct inode *, struct file *, unsigned int, unsigned long);
+int ide_cdrom_check_media_change (ide_drive_t *);
+int ide_cdrom_open (struct inode *, struct file *, ide_drive_t *);
+void ide_cdrom_release (struct inode *, struct file *, ide_drive_t *);
+void ide_cdrom_setup (ide_drive_t *);
+#endif /* CONFIG_BLK_DEV_IDECD */
+
+#ifdef CONFIG_BLK_DEV_IDETAPE
+
+/*
+ *	Functions in ide-tape.c which are invoked from ide.c:
+ */
+
+/*
+ *	idetape_identify_device is called during device probing stage to
+ *	probe for an ide atapi tape drive and to initialize global variables
+ *	in ide-tape.c which provide the link between the character device
+ *	and the correspoding block device.
+ *
+ *	Returns 1 if an ide tape was detected and is supported.
+ *	Returns 0 otherwise.
+ */
+ 
+int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id);
+
+/*
+ *	idetape_setup is called a bit later than idetape_identify_device,
+ *	during the search for disk partitions, to initialize various tape
+ *	state variables in ide_drive_t *drive.
+ */
+ 
+void idetape_setup (ide_drive_t *drive);
+
+/*
+ *	idetape_do_request is our request function. It is called by ide.c
+ *	to process a new request.
+ */
+
+void idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block);
+
+/*
+ *	idetape_end_request is used to finish servicing a request, and to
+ *	insert a pending pipeline request into the main device queue.
+ */
+ 
+void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup);
+
+/*
+ *	Block device interface functions.
+ */
+  
+int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg);
+int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive);
+void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive);
+
+/*
+ *	idetape_register_chrdev initializes the character device interface to
+ *	the ide tape drive.
+ */
+ 
+void idetape_register_chrdev (void);
+
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+
+#ifdef CONFIG_BLK_DEV_TRITON
+void ide_init_triton (byte, byte);
+#endif /* CONFIG_BLK_DEV_TRITON */
diff --git a/i386/i386at/gpl/linux/block/ide_modes.h b/i386/i386at/gpl/linux/block/ide_modes.h
new file mode 100644
index 0000000..e174d5d
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/ide_modes.h
@@ -0,0 +1,142 @@
+#ifndef _IDE_MODES_H
+#define _IDE_MODES_H
+/*
+ *  linux/drivers/block/ide_modes.h
+ *
+ *  Copyright (C) 1996  Linus Torvalds, Igor Abramov, and Mark Lord
+ */
+
+/*
+ * Shared data/functions for determining best PIO mode for an IDE drive.
+ * Most of this stuff originally lived in cmd640.c, and changes to the
+ * ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
+ * breaking the fragile cmd640.c support.
+ */
+
+#if defined(CONFIG_BLK_DEV_CMD640) || defined(CONFIG_IDE_CHIPSETS)
+
+#ifndef _IDE_C
+
+int ide_scan_pio_blacklist (char *model);
+unsigned int ide_get_best_pio_mode (ide_drive_t *drive);
+
+#else /* _IDE_C */
+
+/*
+ * Black list. Some drives incorrectly report their maximal PIO mode,
+ * at least in respect to CMD640. Here we keep info on some known drives.
+ */
+static struct ide_pio_info {
+	const char	*name;
+	int		pio;
+} ide_pio_blacklist [] = {
+/*	{ "Conner Peripherals 1275MB - CFS1275A", 4 }, */
+
+	{ "WDC AC2700",  3 },
+	{ "WDC AC2540",  3 },
+	{ "WDC AC2420",  3 },
+	{ "WDC AC2340",  3 },
+	{ "WDC AC2250",  0 },
+	{ "WDC AC2200",  0 },
+	{ "WDC AC2120",  0 },
+	{ "WDC AC2850",  3 },
+	{ "WDC AC1270",  3 },
+	{ "WDC AC1170",  3 },
+	{ "WDC AC1210",  1 },
+	{ "WDC AC280",   0 },
+/*	{ "WDC AC21000", 4 }, */
+	{ "WDC AC31000", 3 },
+/*	{ "WDC AC21200", 4 }, */
+	{ "WDC AC31200", 3 },
+/*	{ "WDC AC31600", 4 }, */
+
+	{ "Maxtor 7131 AT", 1 },
+	{ "Maxtor 7171 AT", 1 },
+	{ "Maxtor 7213 AT", 1 },
+	{ "Maxtor 7245 AT", 1 },
+	{ "Maxtor 7345 AT", 1 },
+	{ "Maxtor 7546 AT", 3 },
+	{ "Maxtor 7540 AV", 3 },
+
+	{ "SAMSUNG SHD-3121A", 1 },
+	{ "SAMSUNG SHD-3122A", 1 },
+	{ "SAMSUNG SHD-3172A", 1 },
+
+/*	{ "ST51080A", 4 },
+ *	{ "ST51270A", 4 },
+ *	{ "ST31220A", 4 },
+ *	{ "ST31640A", 4 },
+ *	{ "ST32140A", 4 },
+ *	{ "ST3780A",  4 },
+ */
+	{ "ST5660A",  3 },
+	{ "ST3660A",  3 },
+	{ "ST3630A",  3 },
+	{ "ST3655A",  3 },
+	{ "ST3391A",  3 },
+	{ "ST3390A",  1 },
+	{ "ST3600A",  1 },
+	{ "ST3290A",  0 },
+	{ "ST3144A",  0 },
+
+	{ "QUANTUM ELS127A", 0 },
+	{ "QUANTUM ELS170A", 0 },
+	{ "QUANTUM LPS240A", 0 },
+	{ "QUANTUM LPS210A", 3 },
+	{ "QUANTUM LPS270A", 3 },
+	{ "QUANTUM LPS365A", 3 },
+	{ "QUANTUM LPS540A", 3 },
+	{ "QUANTUM FIREBALL", 3 }, /* For models 540/640/1080/1280 */
+				   /* 1080A works fine in mode4 with triton */
+	{ NULL,	0 }
+};
+
+/*
+ * This routine searches the ide_pio_blacklist for an entry
+ * matching the start/whole of the supplied model name.
+ *
+ * Returns -1 if no match found.
+ * Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
+ */
+int ide_scan_pio_blacklist (char *model)
+{
+	struct ide_pio_info *p;
+
+	for (p = ide_pio_blacklist; p->name != NULL; p++) {
+		if (strncmp(p->name, model, strlen(p->name)) == 0)
+			return p->pio;
+	}
+	return -1;
+}
+
+/*
+ * This routine returns the recommended PIO mode for a given drive,
+ * based on the drive->id information and the ide_pio_blacklist[].
+ * This is used by most chipset support modules when "auto-tuning".
+ */
+unsigned int ide_get_best_pio_mode (ide_drive_t *drive)
+{
+	unsigned int pio = 0;
+	struct hd_driveid *id = drive->id;
+
+	if (id != NULL) {
+		if (HWIF(drive)->chipset != ide_cmd640 && !strcmp("QUANTUM FIREBALL1080A", id->model))
+			pio = 4;
+		else
+			pio = ide_scan_pio_blacklist(id->model);
+		if (pio == -1) {
+			pio = (id->tPIO < 2) ? id->tPIO : 2;
+			if (id->field_valid & 2) {
+				byte modes = id->eide_pio_modes;
+				if      (modes & 4)	pio = 5;
+				else if (modes & 2)	pio = 4;
+				else if (modes & 1)	pio = 3;
+			}
+		}
+	}
+	return pio;
+}
+
+#endif /* _IDE_C */
+#endif /* defined(CONFIG_BLK_DEV_CMD640) || defined(CONFIG_IDE_CHIPSETS) */
+#endif /* _IDE_MODES_H */
diff --git a/i386/i386at/gpl/linux/block/rz1000.c b/i386/i386at/gpl/linux/block/rz1000.c
new file mode 100644
index 0000000..11f1dbd
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/rz1000.c
@@ -0,0 +1,56 @@
+/*
+ *  linux/drivers/block/rz1000.c	Version 0.02  Feb 08, 1996
+ *
+ *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
+ */
+
+/*
+ *  Principal Author/Maintainer:  mlord@bnr.ca (Mark Lord)
+ *
+ *  This file provides support for disabling the buggy read-ahead
+ *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
+ */
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <asm/io.h>
+#include <linux/bios32.h>
+#include <linux/pci.h>
+#include "ide.h"
+
+static void ide_pci_access_error (int rc)
+{
+	printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
+}
+
+void init_rz1000 (byte bus, byte fn)
+{
+	int rc;
+	unsigned short reg;
+
+	printk("ide: buggy RZ1000 interface: ");
+	if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &reg))) {
+		ide_pci_access_error (rc);
+	} else if (!(reg & 1)) {
+		printk("not enabled\n");
+	} else {
+		if ((rc = pcibios_read_config_word(bus, fn, 0x40, &reg))
+		 || (rc =  pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
+		{
+			ide_hwifs[0].no_unmask = 1;
+			ide_hwifs[1].no_unmask = 1;
+			ide_hwifs[0].serialized = 1;
+			ide_pci_access_error (rc);
+			printk("serialized, disabled unmasking\n");
+		} else
+			printk("disabled read-ahead\n");
+	}
+}
diff --git a/i386/i386at/gpl/linux/block/triton.c b/i386/i386at/gpl/linux/block/triton.c
new file mode 100644
index 0000000..5829661
--- /dev/null
+++ b/i386/i386at/gpl/linux/block/triton.c
@@ -0,0 +1,459 @@
+/*
+ *  linux/drivers/block/triton.c	Version 1.06  Feb 6, 1996
+ *
+ *  Copyright (c) 1995-1996  Mark Lord
+ *  May be copied or modified under the terms of the GNU General Public License
+ */
+
+/*
+ * This module provides support for the Bus Master IDE DMA function
+ * of the Intel PCI Triton chipset (82371FB).
+ *
+ * DMA is currently supported only for hard disk drives (not cdroms).
+ *
+ * Support for cdroms will likely be added at a later date,
+ * after broader experience has been obtained with hard disks.
+ *
+ * Up to four drives may be enabled for DMA, and the Triton chipset will
+ * (hopefully) arbitrate the PCI bus among them.  Note that the 82371FB chip
+ * provides a single "line buffer" for the BM IDE function, so performance of
+ * multiple (two) drives doing DMA simultaneously will suffer somewhat,
+ * as they contest for that resource bottleneck.  This is handled transparently
+ * inside the 82371FB chip.
+ *
+ * By default, DMA support is prepared for use, but is currently enabled only
+ * for drives which support multi-word DMA mode2 (mword2), or which are
+ * recognized as "good" (see table below).  Drives with only mode0 or mode1
+ * (single or multi) DMA should also work with this chipset/driver (eg. MC2112A)
+ * but are not enabled by default.  Use "hdparm -i" to view modes supported
+ * by a given drive.
+ *
+ * The hdparm-2.4 (or later) utility can be used for manually enabling/disabling
+ * DMA support, but must be (re-)compiled against this kernel version or later.
+ *
+ * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
+ * If problems arise, ide.c will disable DMA operation after a few retries.
+ * This error recovery mechanism works and has been extremely well exercised.
+ *
+ * IDE drives, depending on their vintage, may support several different modes
+ * of DMA operation.  The boot-time modes are indicated with a "*" in
+ * the "hdparm -i" listing, and can be changed with *knowledgeable* use of
+ * the "hdparm -X" feature.  There is seldom a need to do this, as drives
+ * normally power-up with their "best" PIO/DMA modes enabled.
+ *
+ * Testing was done with an ASUS P55TP4XE/100 system and the following drives:
+ *
+ *   Quantum Fireball 1080A (1Gig w/83kB buffer), DMA mode2, PIO mode4.
+ *	- DMA mode2 works well (7.4MB/sec), despite the tiny on-drive buffer.
+ *	- This drive also does PIO mode4, at about the same speed as DMA mode2.
+ *	  An awesome drive for the price!
+ *
+ *   Fujitsu M1606TA (1Gig w/256kB buffer), DMA mode2, PIO mode4.
+ *	- DMA mode2 gives horrible performance (1.6MB/sec), despite the good
+ *	  size of the on-drive buffer and a boasted 10ms average access time.
+ *	- PIO mode4 was better, but peaked at a mere 4.5MB/sec.
+ *
+ *   Micropolis MC2112A (1Gig w/508kB buffer), drive pre-dates EIDE and ATA2.
+ *	- DMA works fine (2.2MB/sec), probably due to the large on-drive buffer.
+ *	- This older drive can also be tweaked for fastPIO (3.7MB/sec) by using
+ *	  maximum clock settings (5,4) and setting all flags except prefetch.
+ *
+ *   Western Digital AC31000H (1Gig w/128kB buffer), DMA mode1, PIO mode3.
+ *	- DMA does not work reliably.  The drive appears to be somewhat tardy
+ *	  in deasserting DMARQ at the end of a sector.  This is evident in
+ *	  the observation that WRITEs work most of the time, depending on
+ *	  cache-buffer occupancy, but multi-sector reads seldom work.
+ *
+ * Testing was done with a Gigabyte GA-586 ATE system and the following drive:
+ * (Uwe Bonnes - bon@elektron.ikp.physik.th-darmstadt.de)
+ *
+ *   Western Digital AC31600H (1.6Gig w/128kB buffer), DMA mode2, PIO mode4.
+ *	- much better than its 1Gig cousin, this drive is reported to work
+ *	  very well with DMA (7.3MB/sec).
+ *
+ * Other drives:
+ *
+ *   Maxtor 7540AV (515Meg w/32kB buffer), DMA modes mword0/sword2, PIO mode3.
+ *	- a budget drive, with budget performance, around 3MB/sec.
+ *
+ *   Western Digital AC2850F (814Meg w/64kB buffer), DMA mode1, PIO mode3.
+ *	- another "caviar" drive, similar to the AC31000, except that this one
+ *	  worked with DMA in at least one system.  Throughput is about 3.8MB/sec
+ *	  for both DMA and PIO.
+ *
+ *   Conner CFS850A (812Meg w/64kB buffer), DMA mode2, PIO mode4.
+ *	- like most Conner models, this drive proves that even a fast interface
+ *	  cannot improve slow media.  Both DMA and PIO peak around 3.5MB/sec.
+ *
+ * If you have any drive models to add, email your results to:  mlord@bnr.ca
+ * Keep an eye on /var/adm/messages for "DMA disabled" messages.
+ *
+ * Some people have reported trouble with Intel Zappa motherboards.
+ * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
+ * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
+ * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
+ *
+ * And, yes, Intel Zappa boards really *do* use the Triton IDE ports.
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/pci.h>
+#include <linux/bios32.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include "ide.h"
+
+/*
+ * good_dma_drives() lists the model names (from "hdparm -i")
+ * of drives which do not support mword2 DMA but which are
+ * known to work fine with this interface under Linux.
+ */
+const char *good_dma_drives[] = {"Micropolis 2112A",
+				 "CONNER CTMA 4000"};
+
+/*
+ * Our Physical Region Descriptor (PRD) table should be large enough
+ * to handle the biggest I/O request we are likely to see.  Since requests
+ * can have no more than 256 sectors, and since the typical blocksize is
+ * two sectors, we could get by with a limit of 128 entries here for the
+ * usual worst case.  Most requests seem to include some contiguous blocks,
+ * further reducing the number of table entries required.
+ *
+ * The driver reverts to PIO mode for individual requests that exceed
+ * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling
+ * 100% of all crazy scenarios here is not necessary.
+ *
+ * As it turns out though, we must allocate a full 4KB page for this,
+ * so the two PRD tables (ide0 & ide1) will each get half of that,
+ * allowing each to have about 256 entries (8 bytes each) from this.
+ */
+#define PRD_BYTES	8
+#define PRD_ENTRIES	(PAGE_SIZE / (2 * PRD_BYTES))
+
+/*
+ * dma_intr() is the handler for disk read/write DMA interrupts
+ */
+static void dma_intr (ide_drive_t *drive)
+{
+	byte stat, dma_stat;
+	int i;
+	struct request *rq = HWGROUP(drive)->rq;
+	unsigned short dma_base = HWIF(drive)->dma_base;
+
+	dma_stat = inb(dma_base+2);		/* get DMA status */
+	outb(inb(dma_base)&~1, dma_base);	/* stop DMA operation */
+	stat = GET_STAT();			/* get drive status */
+	if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
+		if ((dma_stat & 7) == 4) {	/* verify good DMA status */
+			rq = HWGROUP(drive)->rq;
+			for (i = rq->nr_sectors; i > 0;) {
+				i -= rq->current_nr_sectors;
+				ide_end_request(1, HWGROUP(drive));
+			}
+			return;
+		}
+		printk("%s: bad DMA status: 0x%02x\n", drive->name, dma_stat);
+	}
+	sti();
+	ide_error(drive, "dma_intr", stat);
+}
+
+/*
+ * build_dmatable() prepares a dma request.
+ * Returns 0 if all went okay, returns 1 otherwise.
+ */
+static int build_dmatable (ide_drive_t *drive)
+{
+	struct request *rq = HWGROUP(drive)->rq;
+	struct buffer_head *bh = rq->bh;
+	unsigned long size, addr, *table = HWIF(drive)->dmatable;
+	unsigned int count = 0;
+
+	do {
+		/*
+		 * Determine addr and size of next buffer area.  We assume that
+		 * individual virtual buffers are always composed linearly in
+		 * physical memory.  For example, we assume that any 8kB buffer
+		 * is always composed of two adjacent physical 4kB pages rather
+		 * than two possibly non-adjacent physical 4kB pages.
+		 */
+		if (bh == NULL) {  /* paging and tape requests have (rq->bh == NULL) */
+			addr = virt_to_bus (rq->buffer);
+#ifdef CONFIG_BLK_DEV_IDETAPE
+			if (drive->media == ide_tape)
+				size = drive->tape.pc->request_transfer;
+			else
+#endif /* CONFIG_BLK_DEV_IDETAPE */	
+			size = rq->nr_sectors << 9;
+		} else {
+			/* group sequential buffers into one large buffer */
+			addr = virt_to_bus (bh->b_data);
+			size = bh->b_size;
+			while ((bh = bh->b_reqnext) != NULL) {
+				if ((addr + size) != virt_to_bus (bh->b_data))
+					break;
+				size += bh->b_size;
+			}
+		}
+
+		/*
+		 * Fill in the dma table, without crossing any 64kB boundaries.
+		 * We assume 16-bit alignment of all blocks.
+		 */
+		while (size) {
+			if (++count >= PRD_ENTRIES) {
+				printk("%s: DMA table too small\n", drive->name);
+				return 1; /* revert to PIO for this request */
+			} else {
+				unsigned long bcount = 0x10000 - (addr & 0xffff);
+				if (bcount > size)
+					bcount = size;
+				*table++ = addr;
+				*table++ = bcount;
+				addr += bcount;
+				size -= bcount;
+			}
+		}
+	} while (bh != NULL);
+	if (count) {
+		*--table |= 0x80000000;	/* set End-Of-Table (EOT) bit */
+		return 0;
+	}
+	printk("%s: empty DMA table?\n", drive->name);
+	return 1;	/* let the PIO routines handle this weirdness */
+}
+
+static int config_drive_for_dma (ide_drive_t *drive)
+{
+	const char **list;
+
+	struct hd_driveid *id = drive->id;
+	if (id && (id->capability & 1)) {
+		/* Enable DMA on any drive that supports mword2 DMA */
+		if ((id->field_valid & 2) && (id->dma_mword & 0x404) == 0x404) {
+			drive->using_dma = 1;
+			return 0;		/* DMA enabled */
+		}
+		/* Consult the list of known "good" drives */
+		list = good_dma_drives;
+		while (*list) {
+			if (!strcmp(*list++,id->model)) {
+				drive->using_dma = 1;
+				return 0;	/* DMA enabled */
+			}
+		}
+	}
+	return 1;	/* DMA not enabled */
+}
+
+/*
+ * triton_dmaproc() initiates/aborts DMA read/write operations on a drive.
+ *
+ * The caller is assumed to have selected the drive and programmed the drive's
+ * sector address using CHS or LBA.  All that remains is to prepare for DMA
+ * and then issue the actual read/write DMA/PIO command to the drive.
+ *
+ * For ATAPI devices, we just prepare for DMA and return. The caller should
+ * then issue the packet command to the drive and call us again with
+ * ide_dma_begin afterwards.
+ *
+ * Returns 0 if all went well.
+ * Returns 1 if DMA read/write could not be started, in which case
+ * the caller should revert to PIO for the current request.
+ */
+static int triton_dmaproc (ide_dma_action_t func, ide_drive_t *drive)
+{
+	unsigned long dma_base = HWIF(drive)->dma_base;
+	unsigned int reading = (1 << 3);
+
+	switch (func) {
+		case ide_dma_abort:
+			outb(inb(dma_base)&~1, dma_base);	/* stop DMA */
+			return 0;
+		case ide_dma_check:
+			return config_drive_for_dma (drive);
+		case ide_dma_write:
+			reading = 0;
+		case ide_dma_read:
+			break;
+		case ide_dma_status_bad:
+			return ((inb(dma_base+2) & 7) != 4);	/* verify good DMA status */
+		case ide_dma_transferred:
+#if 0
+			return (number of bytes actually transferred);
+#else
+			return (0);
+#endif
+		case ide_dma_begin:
+			outb(inb(dma_base)|1, dma_base);	/* begin DMA */
+			return 0;
+		default:
+			printk("triton_dmaproc: unsupported func: %d\n", func);
+			return 1;
+	}
+	if (build_dmatable (drive))
+		return 1;
+	outl(virt_to_bus (HWIF(drive)->dmatable), dma_base + 4); /* PRD table */
+	outb(reading, dma_base);			/* specify r/w */
+	outb(0x26, dma_base+2);				/* clear status bits */
+#ifdef CONFIG_BLK_DEV_IDEATAPI
+	if (drive->media != ide_disk)
+		return 0;
+#endif /* CONFIG_BLK_DEV_IDEATAPI */	
+	ide_set_handler(drive, &dma_intr, WAIT_CMD);	/* issue cmd to drive */
+	OUT_BYTE(reading ? WIN_READDMA : WIN_WRITEDMA, IDE_COMMAND_REG);
+	outb(inb(dma_base)|1, dma_base);		/* begin DMA */
+	return 0;
+}
+
+/*
+ * print_triton_drive_flags() displays the currently programmed options
+ * in the Triton chipset for a given drive.
+ *
+ *	If fastDMA  is "no", then slow ISA timings are used for DMA data xfers.
+ *	If fastPIO  is "no", then slow ISA timings are used for PIO data xfers.
+ *	If IORDY    is "no", then IORDY is assumed to always be asserted.
+ *	If PreFetch is "no", then data pre-fetch/post are not used.
+ *
+ * When "fastPIO" and/or "fastDMA" are "yes", then faster PCI timings and
+ * back-to-back 16-bit data transfers are enabled, using the sample_CLKs
+ * and recovery_CLKs (PCI clock cycles) timing parameters for that interface.
+ */
+static void print_triton_drive_flags (unsigned int unit, byte flags)
+{
+	printk("         %s ", unit ? "slave :" : "master:");
+	printk( "fastDMA=%s",	(flags&9)	? "on " : "off");
+	printk(" PreFetch=%s",	(flags&4)	? "on " : "off");
+	printk(" IORDY=%s",	(flags&2)	? "on " : "off");
+	printk(" fastPIO=%s\n",	((flags&9)==1)	? "on " : "off");
+}
+
+static void init_triton_dma (ide_hwif_t *hwif, unsigned short base)
+{
+	static unsigned long dmatable = 0;
+
+	printk("    %s: BusMaster DMA at 0x%04x-0x%04x", hwif->name, base, base+7);
+	if (check_region(base, 8)) {
+		printk(" -- ERROR, PORTS ALREADY IN USE");
+	} else {
+		request_region(base, 8, "triton DMA");
+		hwif->dma_base = base;
+		if (!dmatable) {
+			/*
+			 * Since we know we are on a PCI bus, we could
+			 * actually use __get_free_pages() here instead
+			 * of __get_dma_pages() -- no ISA limitations.
+			 */
+			dmatable = __get_dma_pages(GFP_KERNEL, 0);
+		}
+		if (dmatable) {
+			hwif->dmatable = (unsigned long *) dmatable;
+			dmatable += (PRD_ENTRIES * PRD_BYTES);
+			outl(virt_to_bus(hwif->dmatable), base + 4);
+			hwif->dmaproc  = &triton_dmaproc;
+		}
+	}
+	printk("\n");
+}
+
+/*
+ * calc_mode() returns the ATA PIO mode number, based on the number
+ * of cycle clks passed in.  Assumes 33Mhz bus operation (30ns per clk).
+ */
+byte calc_mode (byte clks)
+{
+	if (clks == 3)	return 5;
+	if (clks == 4)	return 4;
+	if (clks <  6)	return 3;
+	if (clks <  8)	return 2;
+	if (clks < 13)	return 1;
+	return 0;
+}
+
+/*
+ * ide_init_triton() prepares the IDE driver for DMA operation.
+ * This routine is called once, from ide.c during driver initialization,
+ * for each triton chipset which is found (unlikely to be more than one).
+ */
+void ide_init_triton (byte bus, byte fn)
+{
+	int rc = 0, h;
+	int dma_enabled = 0;
+	unsigned short bmiba, pcicmd;
+	unsigned int timings;
+
+	printk("ide: Triton BM-IDE on PCI bus %d function %d\n", bus, fn);
+	/*
+	 * See if IDE and BM-DMA features are enabled:
+	 */
+	if ((rc = pcibios_read_config_word(bus, fn, 0x04, &pcicmd)))
+		goto quit;
+	if ((pcicmd & 1) == 0)  {
+		printk("ide: Triton IDE ports are not enabled\n");
+		goto quit;
+	}
+	if ((pcicmd & 4) == 0) {
+		printk("ide: Triton BM-DMA feature is not enabled -- upgrade your BIOS\n");
+	} else {
+		/*
+		 * Get the bmiba base address
+		 */
+		if ((rc = pcibios_read_config_word(bus, fn, 0x20, &bmiba)))
+			goto quit;
+		bmiba &= 0xfff0;	/* extract port base address */
+		dma_enabled = 1;
+	}
+
+	/*
+	 * See if ide port(s) are enabled
+	 */
+	if ((rc = pcibios_read_config_dword(bus, fn, 0x40, &timings)))
+		goto quit;
+	if (!(timings & 0x80008000)) {
+		printk("ide: neither Triton IDE port is enabled\n");
+		goto quit;
+	}
+
+	/*
+	 * Save the dma_base port addr for each interface
+	 */
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		byte s_clks, r_clks;
+		ide_hwif_t *hwif = &ide_hwifs[h];
+		unsigned short time;
+		if (hwif->io_base == 0x1f0) {
+			time = timings & 0xffff;
+			if ((timings & 0x8000) == 0)	/* interface enabled? */
+				continue;
+			hwif->chipset = ide_triton;
+			if (dma_enabled)
+				init_triton_dma(hwif, bmiba);
+		} else if (hwif->io_base == 0x170) {
+			time = timings >> 16;
+			if ((timings & 0x8000) == 0)	/* interface enabled? */
+				continue;
+			hwif->chipset = ide_triton;
+			if (dma_enabled)
+				init_triton_dma(hwif, bmiba + 8);
+		} else
+			continue;
+		s_clks = ((~time >> 12) & 3) + 2;
+		r_clks = ((~time >>  8) & 3) + 1;
+		printk("    %s timing: (0x%04x) sample_CLKs=%d, recovery_CLKs=%d (PIO mode%d)\n",
+		 hwif->name, time, s_clks, r_clks, calc_mode(s_clks+r_clks));
+		print_triton_drive_flags (0, time & 0xf);
+		print_triton_drive_flags (1, (time >> 4) & 0xf);
+	}
+
+quit: if (rc) printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
+}
+