1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 690 insertions, 0 deletions

diff --git a/linux/src/drivers/net/3c503.c b/linux/src/drivers/net/3c503.c
new file mode 100644
index 0000000..a562db3
--- /dev/null
+++ b/linux/src/drivers/net/3c503.c
@@ -0,0 +1,690 @@
+/* 3c503.c: A shared-memory NS8390 ethernet driver for linux. */
+/*
+    Written 1992-94 by Donald Becker.
+
+    Copyright 1993 United States Government as represented by the
+    Director, National Security Agency.  This software may be used and
+    distributed according to the terms of the GNU Public License,
+    incorporated herein by reference.
+
+    The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
+    Center of Excellence in Space Data and Information Sciences
+       Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
+
+    This driver should work with the 3c503 and 3c503/16.  It should be used
+    in shared memory mode for best performance, although it may also work
+    in programmed-I/O mode.
+
+    Sources:
+    EtherLink II Technical Reference Manual,
+    EtherLink II/16 Technical Reference Manual Supplement,
+    3Com Corporation, 5400 Bayfront Plaza, Santa Clara CA 95052-8145
+    
+    The Crynwr 3c503 packet driver.
+
+    Changelog:
+
+    Paul Gortmaker	: add support for the 2nd 8kB of RAM on 16 bit cards.
+    Paul Gortmaker	: multiple card support for module users.
+    rjohnson@analogic.com : Fix up PIO interface for efficient operation.
+
+*/
+
+static const char *version =
+    "3c503.c:v1.10 9/23/93  Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/byteorder.h>
+
+#include "8390.h"
+#include "3c503.h"
+#define WRD_COUNT 4 
+
+int el2_probe(struct device *dev);
+int el2_pio_probe(struct device *dev);
+int el2_probe1(struct device *dev, int ioaddr);
+
+/* A zero-terminated list of I/O addresses to be probed in PIO mode. */
+static unsigned int netcard_portlist[] =
+	{ 0x300,0x310,0x330,0x350,0x250,0x280,0x2a0,0x2e0,0};
+
+#define EL2_IO_EXTENT	16
+
+#ifdef HAVE_DEVLIST
+/* The 3c503 uses two entries, one for the safe memory-mapped probe and
+   the other for the typical I/O probe. */
+struct netdev_entry el2_drv =
+{"3c503", el2_probe, EL1_IO_EXTENT, 0};
+struct netdev_entry el2pio_drv =
+{"3c503pio", el2_pioprobe1, EL1_IO_EXTENT, netcard_portlist};
+#endif
+
+static int el2_open(struct device *dev);
+static int el2_close(struct device *dev);
+static void el2_reset_8390(struct device *dev);
+static void el2_init_card(struct device *dev);
+static void el2_block_output(struct device *dev, int count,
+			     const unsigned char *buf, const int start_page);
+static void el2_block_input(struct device *dev, int count, struct sk_buff *skb,
+			   int ring_offset);
+static void el2_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
+			 int ring_page);
+
+
+/* This routine probes for a memory-mapped 3c503 board by looking for
+   the "location register" at the end of the jumpered boot PROM space.
+   This works even if a PROM isn't there.
+
+   If the ethercard isn't found there is an optional probe for
+   ethercard jumpered to programmed-I/O mode.
+   */
+int
+el2_probe(struct device *dev)
+{
+    int *addr, addrs[] = { 0xddffe, 0xd9ffe, 0xcdffe, 0xc9ffe, 0};
+    int base_addr = dev->base_addr;
+
+    if (base_addr > 0x1ff)	/* Check a single specified location. */
+	return el2_probe1(dev, base_addr);
+    else if (base_addr != 0)		/* Don't probe at all. */
+	return ENXIO;
+
+    for (addr = addrs; *addr; addr++) {
+	int i;
+	unsigned int base_bits = readb(*addr);
+	/* Find first set bit. */
+	for(i = 7; i >= 0; i--, base_bits >>= 1)
+	    if (base_bits & 0x1)
+		break;
+	if (base_bits != 1)
+	    continue;
+	if (check_region(netcard_portlist[i], EL2_IO_EXTENT))
+	    continue;
+	if (el2_probe1(dev, netcard_portlist[i]) == 0)
+	    return 0;
+    }
+#if ! defined(no_probe_nonshared_memory) && ! defined (HAVE_DEVLIST)
+    return el2_pio_probe(dev);
+#else
+    return ENODEV;
+#endif
+}
+
+#ifndef HAVE_DEVLIST
+/*  Try all of the locations that aren't obviously empty.  This touches
+    a lot of locations, and is much riskier than the code above. */
+int
+el2_pio_probe(struct device *dev)
+{
+    int i;
+    int base_addr = dev ? dev->base_addr : 0;
+
+    if (base_addr > 0x1ff)	/* Check a single specified location. */
+	return el2_probe1(dev, base_addr);
+    else if (base_addr != 0)	/* Don't probe at all. */
+	return ENXIO;
+
+    for (i = 0; netcard_portlist[i]; i++) {
+	int ioaddr = netcard_portlist[i];
+	if (check_region(ioaddr, EL2_IO_EXTENT))
+	    continue;
+	if (el2_probe1(dev, ioaddr) == 0)
+	    return 0;
+    }
+
+    return ENODEV;
+}
+#endif
+
+/* Probe for the Etherlink II card at I/O port base IOADDR,
+   returning non-zero on success.  If found, set the station
+   address and memory parameters in DEVICE. */
+int
+el2_probe1(struct device *dev, int ioaddr)
+{
+    int i, iobase_reg, membase_reg, saved_406, wordlength;
+    static unsigned version_printed = 0;
+    unsigned long vendor_id;
+
+    /* Reset and/or avoid any lurking NE2000 */
+    if (inb(ioaddr + 0x408) == 0xff) {
+    	udelay(1000);
+	return ENODEV;
+    }
+
+    /* We verify that it's a 3C503 board by checking the first three octets
+       of its ethernet address. */
+    iobase_reg = inb(ioaddr+0x403);
+    membase_reg = inb(ioaddr+0x404);
+    /* ASIC location registers should be 0 or have only a single bit set. */
+    if (   (iobase_reg  & (iobase_reg - 1))
+	|| (membase_reg & (membase_reg - 1))) {
+	return ENODEV;
+    }
+    saved_406 = inb_p(ioaddr + 0x406);
+    outb_p(ECNTRL_RESET|ECNTRL_THIN, ioaddr + 0x406); /* Reset it... */
+    outb_p(ECNTRL_THIN, ioaddr + 0x406);
+    /* Map the station addr PROM into the lower I/O ports. We now check
+       for both the old and new 3Com prefix */
+    outb(ECNTRL_SAPROM|ECNTRL_THIN, ioaddr + 0x406);
+    vendor_id = inb(ioaddr)*0x10000 + inb(ioaddr + 1)*0x100 + inb(ioaddr + 2);
+    if ((vendor_id != OLD_3COM_ID) && (vendor_id != NEW_3COM_ID)) {
+	/* Restore the register we frobbed. */
+	outb(saved_406, ioaddr + 0x406);
+	return ENODEV;
+    }
+
+    /* We should have a "dev" from Space.c or the static module table. */
+    if (dev == NULL) {
+	printk("3c503.c: Passed a NULL device.\n");
+	dev = init_etherdev(0, 0);
+    }
+
+    if (ei_debug  &&  version_printed++ == 0)
+	printk(version);
+
+    dev->base_addr = ioaddr;
+    /* Allocate dev->priv and fill in 8390 specific dev fields. */
+    if (ethdev_init(dev)) {
+	printk ("3c503: unable to allocate memory for dev->priv.\n");
+	return -ENOMEM;
+     }
+
+    printk("%s: 3c503 at i/o base %#3x, node ", dev->name, ioaddr);
+
+    /* Retrieve and print the ethernet address. */
+    for (i = 0; i < 6; i++)
+	printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
+
+    /* Map the 8390 back into the window. */
+    outb(ECNTRL_THIN, ioaddr + 0x406);
+
+    /* Check for EL2/16 as described in tech. man. */
+    outb_p(E8390_PAGE0, ioaddr + E8390_CMD);
+    outb_p(0, ioaddr + EN0_DCFG);
+    outb_p(E8390_PAGE2, ioaddr + E8390_CMD);
+    wordlength = inb_p(ioaddr + EN0_DCFG) & ENDCFG_WTS;
+    outb_p(E8390_PAGE0, ioaddr + E8390_CMD);
+
+    /* Probe for, turn on and clear the board's shared memory. */
+    if (ei_debug > 2) printk(" memory jumpers %2.2x ", membase_reg);
+    outb(EGACFR_NORM, ioaddr + 0x405);	/* Enable RAM */
+
+    /* This should be probed for (or set via an ioctl()) at run-time.
+       Right now we use a sleazy hack to pass in the interface number
+       at boot-time via the low bits of the mem_end field.  That value is
+       unused, and the low bits would be discarded even if it was used. */
+#if defined(EI8390_THICK) || defined(EL2_AUI)
+    ei_status.interface_num = 1;
+#else
+    ei_status.interface_num = dev->mem_end & 0xf;
+#endif
+    printk(", using %sternal xcvr.\n", ei_status.interface_num == 0 ? "in" : "ex");
+
+    if ((membase_reg & 0xf0) == 0) {
+	dev->mem_start = 0;
+	ei_status.name = "3c503-PIO";
+    } else {
+	dev->mem_start = ((membase_reg & 0xc0) ? 0xD8000 : 0xC8000) +
+	    ((membase_reg & 0xA0) ? 0x4000 : 0);
+
+#define EL2_MEMSIZE (EL2_MB1_STOP_PG - EL2_MB1_START_PG)*256
+#ifdef EL2MEMTEST
+	/* This has never found an error, but someone might care.
+	   Note that it only tests the 2nd 8kB on 16kB 3c503/16
+	   cards between card addr. 0x2000 and 0x3fff. */
+	{			/* Check the card's memory. */
+	    unsigned long mem_base = dev->mem_start;
+	    unsigned int test_val = 0xbbadf00d;
+	    writel(0xba5eba5e, mem_base);
+	    for (i = sizeof(test_val); i < EL2_MEMSIZE; i+=sizeof(test_val)) {
+		writel(test_val, mem_base + i);
+		if (readl(mem_base) != 0xba5eba5e
+		    || readl(mem_base + i) != test_val) {
+		    printk("3c503: memory failure or memory address conflict.\n");
+		    dev->mem_start = 0;
+		    ei_status.name = "3c503-PIO";
+		    break;
+		}
+		test_val += 0x55555555;
+		writel(0, mem_base + i);
+	    }
+	}
+#endif  /* EL2MEMTEST */
+
+	dev->mem_end = dev->rmem_end = dev->mem_start + EL2_MEMSIZE;
+
+	if (wordlength) {	/* No Tx pages to skip over to get to Rx */
+		dev->rmem_start = dev->mem_start;
+		ei_status.name = "3c503/16";
+	} else {
+		dev->rmem_start = TX_PAGES*256 + dev->mem_start;
+		ei_status.name = "3c503";
+	}
+    }
+
+    /*
+	Divide up the memory on the card. This is the same regardless of
+	whether shared-mem or PIO is used. For 16 bit cards (16kB RAM),
+	we use the entire 8k of bank1 for an Rx ring. We only use 3k 
+	of the bank0 for 2 full size Tx packet slots. For 8 bit cards,
+	(8kB RAM) we use 3kB of bank1 for two Tx slots, and the remaining 
+	5kB for an Rx ring.  */
+
+    if (wordlength) {
+	ei_status.tx_start_page = EL2_MB0_START_PG;
+	ei_status.rx_start_page = EL2_MB1_START_PG;
+    } else {
+	ei_status.tx_start_page = EL2_MB1_START_PG;
+	ei_status.rx_start_page = EL2_MB1_START_PG + TX_PAGES;
+    }
+
+    /* Finish setting the board's parameters. */
+    ei_status.stop_page = EL2_MB1_STOP_PG;
+    ei_status.word16 = wordlength;
+    ei_status.reset_8390 = &el2_reset_8390;
+    ei_status.get_8390_hdr = &el2_get_8390_hdr;
+    ei_status.block_input = &el2_block_input;
+    ei_status.block_output = &el2_block_output;
+
+    request_region(ioaddr, EL2_IO_EXTENT, ei_status.name);
+
+    if (dev->irq == 2)
+	dev->irq = 9;
+    else if (dev->irq > 5 && dev->irq != 9) {
+	printk("3c503: configured interrupt %d invalid, will use autoIRQ.\n",
+	       dev->irq);
+	dev->irq = 0;
+    }
+
+    ei_status.saved_irq = dev->irq;
+
+    dev->start = 0;
+    dev->open = &el2_open;
+    dev->stop = &el2_close;
+
+    if (dev->mem_start)
+	printk("%s: %s - %dkB RAM, 8kB shared mem window at %#6lx-%#6lx.\n",
+		dev->name, ei_status.name, (wordlength+1)<<3,
+		dev->mem_start, dev->mem_end-1);
+
+    else
+    {
+	ei_status.tx_start_page = EL2_MB1_START_PG;
+	ei_status.rx_start_page = EL2_MB1_START_PG + TX_PAGES;
+	printk("\n%s: %s, %dkB RAM, using programmed I/O (REJUMPER for SHARED MEMORY).\n",
+	       dev->name, ei_status.name, (wordlength+1)<<3);
+    }
+    return 0;
+}
+
+static int
+el2_open(struct device *dev)
+{
+
+    if (dev->irq < 2) {
+	int irqlist[] = {5, 9, 3, 4, 0};
+	int *irqp = irqlist;
+
+	outb(EGACFR_NORM, E33G_GACFR);	/* Enable RAM and interrupts. */
+	do {
+	    if (request_irq (*irqp, NULL, 0, "bogus", NULL) != -EBUSY) {
+		/* Twinkle the interrupt, and check if it's seen. */
+		autoirq_setup(0);
+		outb_p(0x04 << ((*irqp == 9) ? 2 : *irqp), E33G_IDCFR);
+		outb_p(0x00, E33G_IDCFR);
+		if (*irqp == autoirq_report(0)	 /* It's a good IRQ line! */
+		    && request_irq (dev->irq = *irqp, &ei_interrupt, 0, ei_status.name, NULL) == 0)
+		    break;
+	    }
+	} while (*++irqp);
+	if (*irqp == 0) {
+	    outb(EGACFR_IRQOFF, E33G_GACFR);	/* disable interrupts. */
+	    return -EAGAIN;
+	}
+    } else {
+	if (request_irq(dev->irq, &ei_interrupt, 0, ei_status.name, NULL)) {
+	    return -EAGAIN;
+	}
+    }
+
+    el2_init_card(dev);
+    ei_open(dev);
+    MOD_INC_USE_COUNT;
+    return 0;
+}
+
+static int
+el2_close(struct device *dev)
+{
+    free_irq(dev->irq, NULL);
+    dev->irq = ei_status.saved_irq;
+    irq2dev_map[dev->irq] = NULL;
+    outb(EGACFR_IRQOFF, E33G_GACFR);	/* disable interrupts. */
+
+    ei_close(dev);
+    MOD_DEC_USE_COUNT;
+    return 0;
+}
+
+/* This is called whenever we have a unrecoverable failure:
+       transmit timeout
+       Bad ring buffer packet header
+ */
+static void
+el2_reset_8390(struct device *dev)
+{
+    if (ei_debug > 1) {
+	printk("%s: Resetting the 3c503 board...", dev->name);
+	printk("%#lx=%#02x %#lx=%#02x %#lx=%#02x...", E33G_IDCFR, inb(E33G_IDCFR),
+	       E33G_CNTRL, inb(E33G_CNTRL), E33G_GACFR, inb(E33G_GACFR));
+    }
+    outb_p(ECNTRL_RESET|ECNTRL_THIN, E33G_CNTRL);
+    ei_status.txing = 0;
+    outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+    el2_init_card(dev);
+    if (ei_debug > 1) printk("done\n");
+}
+
+/* Initialize the 3c503 GA registers after a reset. */
+static void
+el2_init_card(struct device *dev)
+{
+    /* Unmap the station PROM and select the DIX or BNC connector. */
+    outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+
+    /* Set ASIC copy of rx's first and last+1 buffer pages */
+    /* These must be the same as in the 8390. */
+    outb(ei_status.rx_start_page, E33G_STARTPG);
+    outb(ei_status.stop_page,  E33G_STOPPG);
+
+    /* Point the vector pointer registers somewhere ?harmless?. */
+    outb(0xff, E33G_VP2);	/* Point at the ROM restart location 0xffff0 */
+    outb(0xff, E33G_VP1);
+    outb(0x00, E33G_VP0);
+    /* Turn off all interrupts until we're opened. */
+    outb_p(0x00,  dev->base_addr + EN0_IMR);
+    /* Enable IRQs iff started. */
+    outb(EGACFR_NORM, E33G_GACFR);
+
+    /* Set the interrupt line. */
+    outb_p((0x04 << (dev->irq == 9 ? 2 : dev->irq)), E33G_IDCFR);
+    outb_p((WRD_COUNT << 1), E33G_DRQCNT);	/* Set burst size to 8 */
+    outb_p(0x20, E33G_DMAAH);	/* Put a valid addr in the GA DMA */
+    outb_p(0x00, E33G_DMAAL);
+    return;			/* We always succeed */
+}
+
+/*
+ * Either use the shared memory (if enabled on the board) or put the packet
+ * out through the ASIC FIFO.
+ */
+static void
+el2_block_output(struct device *dev, int count,
+		 const unsigned char *buf, const int start_page)
+{
+    unsigned short int *wrd;
+    int boguscount;		/* timeout counter */
+    unsigned short word;	/* temporary for better machine code */
+
+    if (ei_status.word16)      /* Tx packets go into bank 0 on EL2/16 card */
+	outb(EGACFR_RSEL|EGACFR_TCM, E33G_GACFR);
+    else 
+	outb(EGACFR_NORM, E33G_GACFR);
+
+    if (dev->mem_start) {	/* Shared memory transfer */
+	unsigned long dest_addr = dev->mem_start +
+	    ((start_page - ei_status.tx_start_page) << 8);
+	memcpy_toio(dest_addr, buf, count);
+	outb(EGACFR_NORM, E33G_GACFR);	/* Back to bank1 in case on bank0 */
+	return;
+    }
+
+/*
+ *  No shared memory, put the packet out the other way.
+ *  Set up then start the internal memory transfer to Tx Start Page
+ */
+
+    word = (unsigned short)start_page;
+    outb(word&0xFF, E33G_DMAAH);
+    outb(word>>8, E33G_DMAAL);
+
+    outb_p((ei_status.interface_num ? ECNTRL_AUI : ECNTRL_THIN ) | ECNTRL_OUTPUT
+	   | ECNTRL_START, E33G_CNTRL);
+
+/*
+ *  Here I am going to write data to the FIFO as quickly as possible.
+ *  Note that E33G_FIFOH is defined incorrectly. It is really
+ *  E33G_FIFOL, the lowest port address for both the byte and
+ *  word write. Variable 'count' is NOT checked. Caller must supply a
+ *  valid count. Note that I may write a harmless extra byte to the
+ *  8390 if the byte-count was not even.
+ */
+    wrd = (unsigned short int *) buf;
+    count  = (count + 1) >> 1;
+    for(;;) 
+    {
+        boguscount = 0x1000;
+        while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
+        {
+            if(!boguscount--)
+            {
+                printk("%s: FIFO blocked in el2_block_output.\n", dev->name);
+                el2_reset_8390(dev);
+                goto blocked;
+            }
+        }
+        if(count > WRD_COUNT)
+        {
+            outsw(E33G_FIFOH, wrd, WRD_COUNT);
+            wrd   += WRD_COUNT;
+            count -= WRD_COUNT;
+        }
+        else
+        {
+            outsw(E33G_FIFOH, wrd, count);
+            break;
+        }
+    }
+    blocked:;
+    outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+    return;
+}
+
+/* Read the 4 byte, page aligned 8390 specific header. */
+static void
+el2_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
+{
+    int boguscount;
+    unsigned long hdr_start = dev->mem_start + ((ring_page - EL2_MB1_START_PG)<<8);
+    unsigned short word;
+
+    if (dev->mem_start) {       /* Use the shared memory. */
+	memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
+	return;
+    }
+
+/*
+ *  No shared memory, use programmed I/O.
+ */
+
+    word = (unsigned short)ring_page;
+    outb(word&0xFF, E33G_DMAAH);
+    outb(word>>8, E33G_DMAAL);
+
+    outb_p((ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI) | ECNTRL_INPUT
+	   | ECNTRL_START, E33G_CNTRL);
+    boguscount = 0x1000;
+    while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
+    {
+        if(!boguscount--)
+        {
+            printk("%s: FIFO blocked in el2_get_8390_hdr.\n", dev->name);
+            memset(hdr, 0x00, sizeof(struct e8390_pkt_hdr));
+            el2_reset_8390(dev);
+            goto blocked;
+        }
+    }
+    insw(E33G_FIFOH, hdr, (sizeof(struct e8390_pkt_hdr))>> 1);
+    blocked:;
+    outb_p(ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+}
+
+
+static void
+el2_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
+{
+    int boguscount = 0;
+    unsigned short int *buf;
+    unsigned short word;
+
+    int end_of_ring = dev->rmem_end;
+
+    /* Maybe enable shared memory just be to be safe... nahh.*/
+    if (dev->mem_start) {	/* Use the shared memory. */
+	ring_offset -= (EL2_MB1_START_PG<<8);
+	if (dev->mem_start + ring_offset + count > end_of_ring) {
+	    /* We must wrap the input move. */
+	    int semi_count = end_of_ring - (dev->mem_start + ring_offset);
+	    memcpy_fromio(skb->data, dev->mem_start + ring_offset, semi_count);
+	    count -= semi_count;
+	    memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);
+	} else {
+		/* Packet is in one chunk -- we can copy + cksum. */
+		eth_io_copy_and_sum(skb, dev->mem_start + ring_offset, count, 0);
+	}
+	return;
+    }
+
+/*
+ *  No shared memory, use programmed I/O.
+ */
+    word = (unsigned short) ring_offset;
+    outb(word>>8, E33G_DMAAH);
+    outb(word&0xFF, E33G_DMAAL);
+
+    outb_p((ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI) | ECNTRL_INPUT
+	   | ECNTRL_START, E33G_CNTRL);
+
+/*
+ *  Here I also try to get data as fast as possible. I am betting that I
+ *  can read one extra byte without clobbering anything in the kernel because
+ *  this would only occur on an odd byte-count and allocation of skb->data
+ *  is word-aligned. Variable 'count' is NOT checked. Caller must check
+ *  for a valid count. 
+ *  [This is currently quite safe.... but if one day the 3c503 explodes
+ *   you know where to come looking ;)]
+ */
+
+    buf =  (unsigned short int *) skb->data;
+    count =  (count + 1) >> 1;
+    for(;;) 
+    {
+        boguscount = 0x1000;
+        while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
+        {
+            if(!boguscount--)
+            {
+                printk("%s: FIFO blocked in el2_block_input.\n", dev->name);
+                el2_reset_8390(dev);
+                goto blocked;
+            }
+        }
+        if(count > WRD_COUNT)
+        { 
+            insw(E33G_FIFOH, buf, WRD_COUNT);
+            buf   += WRD_COUNT;
+            count -= WRD_COUNT;
+        }
+        else
+        {
+            insw(E33G_FIFOH, buf, count);
+            break;
+        }
+    }
+    blocked:;
+    outb_p(ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+    return;
+}
+#ifdef MODULE
+#define MAX_EL2_CARDS	4	/* Max number of EL2 cards per module */
+#define NAMELEN 	8	/* #of chars for storing dev->name */
+
+static char namelist[NAMELEN * MAX_EL2_CARDS] = { 0, };
+static struct device dev_el2[MAX_EL2_CARDS] = {
+	{
+		NULL,		/* assign a chunk of namelist[] below */
+		0, 0, 0, 0,
+		0, 0,
+		0, 0, 0, NULL, NULL
+	},
+};
+
+static int io[MAX_EL2_CARDS] = { 0, };
+static int irq[MAX_EL2_CARDS]  = { 0, };
+static int xcvr[MAX_EL2_CARDS] = { 0, };	/* choose int. or ext. xcvr */
+
+/* This is set up so that only a single autoprobe takes place per call.
+ISA device autoprobes on a running machine are not recommended. */
+int
+init_module(void)
+{
+	int this_dev, found = 0;
+
+	for (this_dev = 0; this_dev < MAX_EL2_CARDS; this_dev++) {
+		struct device *dev = &dev_el2[this_dev];
+		dev->name = namelist+(NAMELEN*this_dev);
+		dev->irq = irq[this_dev];
+		dev->base_addr = io[this_dev];
+		dev->mem_end = xcvr[this_dev];	/* low 4bits = xcvr sel. */
+		dev->init = el2_probe;
+		if (io[this_dev] == 0)  {
+			if (this_dev != 0) break; /* only autoprobe 1st one */
+			printk(KERN_NOTICE "3c503.c: Presently autoprobing (not recommended) for a single card.\n");
+		}
+		if (register_netdev(dev) != 0) {
+			printk(KERN_WARNING "3c503.c: No 3c503 card found (i/o = 0x%x).\n", io[this_dev]);
+			if (found != 0) return 0;	/* Got at least one. */
+			return -ENXIO;
+		}
+		found++;
+	}
+	return 0;
+}
+
+void
+cleanup_module(void)
+{
+	int this_dev;
+
+	for (this_dev = 0; this_dev < MAX_EL2_CARDS; this_dev++) {
+		struct device *dev = &dev_el2[this_dev];
+		if (dev->priv != NULL) {
+			/* NB: el2_close() handles free_irq + irq2dev map */
+			kfree(dev->priv);
+			dev->priv = NULL;
+			release_region(dev->base_addr, EL2_IO_EXTENT);
+			unregister_netdev(dev);
+		}
+	}
+}
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ *  version-control: t
+ *  kept-new-versions: 5
+ *  c-indent-level: 4
+ * End:
+ */