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-rw-r--r--linux/src/drivers/scsi/ppa.c1550
1 files changed, 1550 insertions, 0 deletions
diff --git a/linux/src/drivers/scsi/ppa.c b/linux/src/drivers/scsi/ppa.c
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index 0000000..98749dd
--- /dev/null
+++ b/linux/src/drivers/scsi/ppa.c
@@ -0,0 +1,1550 @@
+/* ppa.c -- low level driver for the IOMEGA PPA3
+ * parallel port SCSI host adapter.
+ *
+ * (The PPA3 is the embedded controller in the ZIP drive.)
+ *
+ * (c) 1995,1996 Grant R. Guenther, grant@torque.net,
+ * under the terms of the GNU Public License.
+ *
+ * Current Maintainer: David Campbell (Perth, Western Australia)
+ * campbell@gear.torque.net
+ * dcampbel@p01.as17.honeywell.com.au
+ *
+ * My unoffical company acronym list is 21 pages long:
+ * FLA: Four letter acronym with built in facility for
+ * future expansion to five letters.
+ */
+
+#include <linux/config.h>
+
+/* The following #define is to avoid a clash with hosts.c */
+#define PPA_CODE 1
+#ifndef HAVE_PC87332
+#define HAVE_PC87332 0
+#endif
+#define PPA_PROBE_SPP 0x0001
+#define PPA_PROBE_PS2 0x0002
+#define PPA_PROBE_ECR 0x0010
+#define PPA_PROBE_EPP17 0x0100
+#define PPA_PROBE_EPP19 0x0200
+int port_probe(unsigned short);
+
+#include <linux/blk.h>
+#include "sd.h"
+#include "hosts.h"
+typedef struct {
+ int base; /* Actual port address */
+ int mode; /* Transfer mode */
+ int host; /* Host number (for proc) */
+ Scsi_Cmnd *cur_cmd; /* Current queued command */
+ struct tq_struct ppa_tq; /* Polling interupt stuff */
+ unsigned long jstart; /* Jiffies at start */
+ unsigned failed:1; /* Failure flag */
+} ppa_struct;
+
+#define PPA_EMPTY \
+{-1, /* base */ \
+PPA_AUTODETECT, /* mode */ \
+-1, /* host */ \
+NULL, /* cur_cmd */ \
+{0, 0, ppa_interrupt, NULL}, \
+0, /* jstart */ \
+0 /* failed */ \
+}
+
+#include "ppa.h"
+#undef CONFIG_PARPORT
+#define NO_HOSTS 4
+static ppa_struct ppa_hosts[NO_HOSTS] =
+{PPA_EMPTY, PPA_EMPTY, PPA_EMPTY, PPA_EMPTY};
+
+#define PPA_BASE(x) ppa_hosts[(x)].base
+
+int base[NO_HOSTS] =
+{0x03bc, 0x0378, 0x0278, 0x0000};
+#define parbus_base base
+#define parbus_no NO_HOSTS
+
+static inline int ppa_pb_claim(int host_no)
+{
+ if (ppa_hosts[host_no].cur_cmd)
+ ppa_hosts[host_no].cur_cmd->SCp.phase++;
+ return 0;
+}
+
+/***************************************************************************
+ * Parallel port probing routines *
+ ***************************************************************************/
+
+#ifndef MODULE
+/*
+ * Command line parameters (for built-in driver):
+ *
+ * Syntax: ppa=base[,mode[,use_sg]]
+ *
+ * For example: ppa=0x378 or ppa=0x378,0,3
+ *
+ */
+
+void ppa_setup(char *str, int *ints)
+{
+ static int x = 0;
+
+ if (x == 0) { /* Disable ALL known ports */
+ int i;
+
+ for (i = 0; i < NO_HOSTS; i++)
+ parbus_base[i] = 0x0000;
+ }
+ switch (ints[0]) {
+ case 3:
+ ppa_sg = ints[3];
+ case 2:
+ ppa_hosts[x].mode = ints[2];
+ parbus_base[x] = ints[1];
+ break;
+ default:
+ printk("PPA: I only use between 2 to 3 parameters.\n");
+ break;
+ }
+ x++;
+ }
+#else
+Scsi_Host_Template driver_template = PPA;
+#include "scsi_module.c"
+#endif
+
+/*
+ * Start of Chipset kludges
+ */
+
+#if HAVE_PC87332 > 0
+#warning PC87332 Kludge code included
+static inline int pc87332_port(int host_no)
+{
+ /* A routine to detect and kludge pc87332 chipsets into the
+ * "optimum" mode for parallel port data transfer.
+ * This assumes EPP is better than ECP...
+ * (Which it is for disk drives but not printers and scanners)
+ */
+ int base = ppa_hosts[host_no].base;
+
+ /* This is where an pc87332 can hide */
+ unsigned short index_addr[4] =
+ {
+ 0x0398, 0x026e, 0x015c, 0x002e
+ };
+
+ /* Bits 0&1 of FAR (Function Address Register) which specify where
+ * the LPT port will show up at.
+ */
+ unsigned short port_ref[4] =
+ {
+ 0x378, 0x3bc, 0x278, 0xffff
+ };
+
+ unsigned char a;
+ int loop;
+
+ for (loop = 0; loop < 4; loop++) {
+ /* Clear the "wax" out of the pc87332, only needed after hard
+ * reset.
+ */
+ inb(index_addr[loop]);
+ inb(index_addr[loop]);
+ inb(index_addr[loop]);
+ inb(index_addr[loop]);
+
+ /* Anyone home ?? */
+ outb(0xff, index_addr[loop]);
+ a = inb(index_addr[loop]);
+ switch (a) {
+ case (0x0f): /* PC87732 */
+ break;
+ case (0x1f): /* PC87306 */
+ break;
+ case (0x7f): /* PC87??? */
+ break;
+ default:
+ continue;
+ } /* Is this pc87332 on the desired port */
+ outb(0x01, index_addr[loop]);
+ a = inb(index_addr[loop] + 1);
+ if (port_ref[a & 0x03] != base)
+ continue;
+
+ /* Found a pc87332 */
+ printk("NatSemi PC87332 (or variant) at 0x%04x\n", base);
+
+ /* Try to enable EPP modes
+ * with hardware data direction
+ */
+ if (base != 0x3bc) {
+ /* EPP 1.9 */
+ outb(0x04, index_addr[loop]);
+ a = inb(index_addr[loop] + 1);
+ printk("Old reg1 = %02x\n", a);
+ /* 0x01 for EPP 1.7, 0x03 for EPP 1.9, 0x0c for ECP */
+ a = (a & 0xf0) | 0x03;
+ outb(a, index_addr[loop] + 1);
+ outb(a, index_addr[loop] + 1);
+
+ /* Software data direction selection */
+ outb(0x02, index_addr[loop]);
+ a = inb(index_addr[loop] + 1);
+ printk("Old reg2 = %02x\n", a);
+ /* 0x80 for software, 0x00 for hardware */
+ a = (a & 0x7f) | 0x80;
+ outb(a, index_addr[loop] + 1);
+ outb(a, index_addr[loop] + 1);
+ ppa_hosts[host_no].mode = PPA_EPP_32;
+ } else {
+ /* There is not enough address space for the 0x3bc port
+ * to have EPP registers so we will kludge it into an
+ * ECP
+ * port to allow bi-directional byte mode...
+ */
+ /* ECP */
+ outb(0x04, index_addr[loop]);
+ a = inb(index_addr[loop] + 1);
+ a = (a & 0xfb) | 0x06;
+ outb(a, index_addr[loop] + 1);
+ outb(a, index_addr[loop] + 1);
+ ppa_hosts[host_no].mode = PPA_PS2;
+ }
+
+ outb(0x04, index_addr[loop]);
+ a = inb(index_addr[loop] + 1);
+ return ppa_hosts[host_no].mode;
+ }
+ return 0;
+ }
+#else
+#define pc87332_port(x)
+#endif /* HAVE_PC87332 */
+
+static inline int generic_port(int host_no)
+{
+ /* Generic parallel port detection
+ * This will try to discover if the port is
+ * EPP, ECP, PS/2 or NIBBLE (In that order, approx....)
+ */
+ unsigned int save_ctr, save_ecr, r;
+ int ppb = PPA_BASE(host_no);
+
+ save_ctr = r_ctr(ppb);
+ save_ecr = r_ecr(ppb);
+ r = port_probe(ppb);
+ w_ecr(ppb, save_ecr);
+ w_ctr(ppb, save_ctr);
+
+ if (r & PPA_PROBE_SPP)
+ ppa_hosts[host_no].mode = PPA_NIBBLE;
+
+ if (r & PPA_PROBE_PS2) {
+ ppa_hosts[host_no].mode = PPA_PS2;
+ if (r & PPA_PROBE_ECR)
+ w_ecr(ppb, 0x20);
+ }
+ if ((r & PPA_PROBE_EPP17) || (r & PPA_PROBE_EPP19)) {
+ /* ppa_hosts[host_no].mode = PPA_EPP_32; */
+ if (r & PPA_PROBE_ECR)
+ w_ecr(ppb, 0x80);
+ }
+ return ppa_hosts[host_no].mode;
+}
+
+int ppa_detect(Scsi_Host_Template * host)
+{
+ struct Scsi_Host *hreg;
+ int ports;
+ int i, nhosts;
+ unsigned short ppb;
+
+ printk("ppa: Version %s\n", PPA_VERSION);
+ nhosts = 0;
+
+ for (i = 0; i < parbus_no; i++) {
+ if (parbus_base[i] == 0x0000)
+ continue;
+ ppb = ppa_hosts[i].base = parbus_base[i];
+
+ /* sanity checks */
+ if (check_region(parbus_base[i],
+ (parbus_base[i] == 0x03bc) ? 3 : 8))
+ continue;
+
+ pc87332_port(i);
+ if (!generic_port(i))
+ continue;
+
+ if (ppa_init(i))
+ continue;
+
+ /* now the glue ... */
+ switch (ppa_hosts[i].mode) {
+ case PPA_NIBBLE:
+ case PPA_PS2:
+ ports = 3;
+ break;
+ case PPA_EPP_8:
+ case PPA_EPP_16:
+ case PPA_EPP_32:
+ ports = 8;
+ break;
+ default: /* Never gets here */
+ continue;
+ }
+ request_region(ppa_hosts[i].base, ports, "ppa");
+ host->can_queue = PPA_CAN_QUEUE;
+ host->sg_tablesize = ppa_sg;
+ hreg = scsi_register(host, 0);
+ hreg->io_port = ppa_hosts[i].base;
+ hreg->n_io_port = ports;
+ hreg->dma_channel = -1;
+ hreg->unique_id = i;
+ ppa_hosts[i].host = hreg->host_no;
+ nhosts++;
+ }
+ if (nhosts == 0)
+ return 0;
+ else
+ return 1; /* return number of hosts detected */
+}
+
+/* This is to give the ppa driver a way to modify the timings (and other
+ * parameters) by writing to the /proc/scsi/ppa/0 file.
+ * Very simple method really... (To simple, no error checking :( )
+ * Reason: Kernel hackers HATE having to unload and reload modules for
+ * testing...
+ * Also gives a method to use a script to obtain optimum timings (TODO)
+ */
+
+static inline int ppa_strncmp(const char *a, const char *b, int len)
+{
+ int loop;
+ for (loop = 0; loop < len; loop++)
+ if (a[loop] != b[loop])
+ return 1;
+
+ return 0;
+}
+static inline int ppa_proc_write(int hostno, char *buffer, int length)
+{
+ unsigned long x;
+
+ if ((length > 5) && (ppa_strncmp(buffer, "mode=", 5) == 0)) {
+ x = simple_strtoul(buffer + 5, NULL, 0);
+ ppa_hosts[hostno].mode = x;
+ return length;
+ }
+ printk("ppa /proc: invalid variable\n");
+ return (-EINVAL);
+}
+
+int ppa_proc_info(char *buffer, char **start, off_t offset,
+ int length, int hostno, int inout)
+{
+ int i;
+ int len = 0;
+
+ for (i = 0; i < 4; i++)
+ if (ppa_hosts[i].host == hostno)
+ break;
+
+ if (inout)
+ return ppa_proc_write(i, buffer, length);
+
+ len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
+ len += sprintf(buffer + len, "Port : 0x%04x\n", ppa_hosts[i].base);
+ len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_hosts[i].mode]);
+
+ /* Request for beyond end of buffer */
+ if (offset > len)
+ return 0;
+
+ *start = buffer + offset;
+ len -= offset;
+ if (len > length)
+ len = length;
+ return len;
+} /* end of ppa.c */
+static int device_check(int host_no);
+
+#if PPA_DEBUG > 0
+#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
+ y, __FUNCTION__, __LINE__); ppa_fail_func(x,y);
+static inline void ppa_fail_func(int host_no, int error_code)
+#else
+static inline void ppa_fail(int host_no, int error_code)
+ #endif
+{
+ /* If we fail a device then we trash status / message bytes */
+ if (ppa_hosts[host_no].cur_cmd) {
+ ppa_hosts[host_no].cur_cmd->result = error_code << 16;
+ ppa_hosts[host_no].failed = 1;
+ }
+}
+
+/*
+ * Wait for the high bit to be set.
+ *
+ * In principle, this could be tied to an interrupt, but the adapter
+ * doesn't appear to be designed to support interrupts. We spin on
+ * the 0x80 ready bit.
+ */
+static unsigned char ppa_wait(int host_no)
+{
+ int k;
+ unsigned short ppb = PPA_BASE(host_no);
+ unsigned char r;
+
+ k = PPA_SPIN_TMO;
+ do {
+ r = r_str(ppb);
+ k--;
+ udelay(1);
+ }
+ while (!(r & 0x80) && (k));
+
+ /*
+ * return some status information.
+ * Semantics: 0xc0 = ZIP wants more data
+ * 0xd0 = ZIP wants to send more data
+ * 0xe0 = ZIP is expecting SCSI command data
+ * 0xf0 = end of transfer, ZIP is sending status
+ */
+ if (k)
+ return (r & 0xf0);
+
+ /* Counter expired - Time out occurred */
+ ppa_fail(host_no, DID_TIME_OUT);
+ printk("ppa timeout in ppa_wait\n");
+ return 0; /* command timed out */
+}
+
+/*
+ * output a string, in whatever mode is available, according to the
+ * PPA protocol.
+ */
+static inline void epp_reset(unsigned short ppb)
+{
+ int i;
+
+ i = r_str(ppb);
+ w_str(ppb, i);
+ w_str(ppb, i & 0xfe);
+}
+
+static inline void ecp_sync(unsigned short ppb)
+{
+ int i;
+
+ if ((r_ecr(ppb) & 0xe0) != 0x80)
+ return;
+
+ for (i = 0; i < 100; i++) {
+ if (r_ecr(ppb) & 0x01)
+ return;
+ udelay(5);
+ }
+ printk("ppa: ECP sync failed as data still present in FIFO.\n");
+}
+
+/*
+ * Here is the asm code for the SPP/PS2 protocols for the i386.
+ * This has been optimised for speed on 386/486 machines. There will
+ * be very little improvement on the current 586+ machines as it is the
+ * IO statements which will limit throughput.
+ */
+#ifdef __i386__
+#define BYTE_OUT(reg) \
+ " movb " #reg ",%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " addl $2,%%edx\n" \
+ " movb $0x0e,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " movb $0x0c,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " subl $2,%%edx\n"
+
+static inline int ppa_byte_out(unsigned short base, char *buffer, unsigned int len)
+{
+ /*
+ * %eax scratch
+ * %ebx Data to transfer
+ * %ecx Counter (Don't touch!!)
+ * %edx Port
+ * %esi Source buffer (mem pointer)
+ *
+ * In case you are wondering what the last line of the asm does...
+ * <output allocation> : <input allocation> : <trashed registers>
+ */
+ asm("shr $2,%%ecx\n" \
+ " jz .no_more_bulk_bo\n" \
+ " .align 4\n" \
+ ".loop_bulk_bo:\n" \
+ " movl (%%esi),%%ebx\n" \
+ BYTE_OUT(%%bl) \
+ BYTE_OUT(%%bh) \
+ " rorl $16,%%ebx\n" \
+ BYTE_OUT(%%bl) \
+ BYTE_OUT(%%bh) \
+ " addl $4,%%esi\n" \
+ " loop .loop_bulk_bo\n" \
+ " .align 4\n" \
+ ".no_more_bulk_bo:" \
+ : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+
+ asm("andl $3,%%ecx\n" \
+ " jz .no_more_loose_bo\n" \
+ " .align 4\n" \
+ ".loop_loose_bo:\n" \
+ BYTE_OUT((%%esi)) \
+ " incl %%esi\n" \
+ " loop .loop_loose_bo\n" \
+ ".no_more_loose_bo:\n" \
+ : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+ return 1; /* All went well - we hope! */
+}
+
+#define BYTE_IN(reg) \
+ " inb (%%dx),%%al\n" \
+ " movb %%al," #reg "\n" \
+ " addl $2,%%edx\n" \
+ " movb $0x27,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " movb $0x25,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " subl $2,%%edx\n"
+
+static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
+{
+ /*
+ * %eax scratch
+ * %ebx Data to transfer
+ * %ecx Counter (Don't touch!!)
+ * %edx Port
+ * %esi Source buffer (mem pointer)
+ *
+ * In case you are wondering what the last line of the asm does...
+ * <output allocation> : <input allocation> : <trashed registers>
+ */
+ asm("shr $2,%%ecx\n" \
+ " jz .no_more_bulk_bi\n" \
+ " .align 4\n" \
+ ".loop_bulk_bi:\n" \
+ BYTE_IN(%%bl) \
+ BYTE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ BYTE_IN(%%bl) \
+ BYTE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ " movl %%ebx,(%%esi)\n" \
+ " addl $4,%%esi\n" \
+ " loop .loop_bulk_bi\n" \
+ " .align 4\n" \
+ ".no_more_bulk_bi:" \
+ : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+
+ asm("andl $3,%%ecx\n" \
+ " jz .no_more_loose_bi\n" \
+ " .align 4\n" \
+ ".loop_loose_bi:\n" \
+ BYTE_IN((%%esi)) \
+ " incl %%esi\n" \
+ " loop .loop_loose_bi\n" \
+ ".no_more_loose_bi:\n" \
+ : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+ return 1; /* All went well - we hope! */
+}
+
+#define NIBBLE_IN(reg) \
+ " incl %%edx\n" \
+ " movb $0x04,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " decl %%edx\n" \
+ " inb (%%dx),%%al\n" \
+ " andb $0xf0,%%al\n" \
+ " movb %%al," #reg "\n" \
+ " incl %%edx\n" \
+ " movb $0x06,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " decl %%edx\n" \
+ " inb (%%dx),%%al\n" \
+ " shrb $4,%%al\n" \
+ " orb %%al," #reg "\n"
+
+static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
+{
+ /*
+ * %eax scratch
+ * %ebx Data to transfer
+ * %ecx Counter (Don't touch!!)
+ * %edx Port
+ * %esi Source buffer (mem pointer)
+ *
+ * In case you are wondering what the last line of the asm does...
+ * <output allocation> : <input allocation> : <trashed registers>
+ */
+ asm("shr $2,%%ecx\n" \
+ " jz .no_more_bulk_ni\n" \
+ " .align 4\n" \
+ ".loop_bulk_ni:\n" \
+ NIBBLE_IN(%%bl) \
+ NIBBLE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ NIBBLE_IN(%%bl) \
+ NIBBLE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ " movl %%ebx,(%%esi)\n" \
+ " addl $4,%%esi\n" \
+ " loop .loop_bulk_ni\n" \
+ " .align 4\n" \
+ ".no_more_bulk_ni:" \
+ : "=S"(buffer): "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx");
+
+ asm("andl $3,%%ecx\n" \
+ " jz .no_more_loose_ni\n" \
+ " .align 4\n" \
+ ".loop_loose_ni:\n" \
+ NIBBLE_IN((%%esi)) \
+ " incl %%esi\n" \
+ " loop .loop_loose_ni\n" \
+ ".no_more_loose_ni:\n" \
+ : /* no output */ : "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx");
+ return 1; /* All went well - we hope! */
+}
+#else /* Old style C routines */
+
+static inline int ppa_byte_out(unsigned short base, const char *buffer, int len)
+{
+ unsigned short ctr_p = base + 2;
+ int i;
+
+ for (i = len; i; i--) {
+ outb(*buffer++, base);
+ outb(0xe, ctr_p);
+ outb(0xc, ctr_p);
+ }
+ return 1; /* All went well - we hope! */
+}
+
+static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
+{
+ unsigned short ctr_p = base + 2;
+ int i;
+
+ for (i = len; i; i--) {
+ *buffer++ = inb(base);
+ outb(0x27, ctr_p);
+ outb(0x25, ctr_p);
+ }
+ return 1; /* All went well - we hope! */
+}
+
+static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
+{
+ unsigned short ctr_p = str_p + 1;
+ unsigned char h, l;
+ int i;
+
+ for (i = len; i; i--) {
+ outb(0x4, ctr_p);
+ h = inb(str_p);
+ outb(0x6, ctr_p);
+ l = inb(str_p);
+ *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4);
+ }
+ return 1; /* All went well - we hope! */
+ }
+ #endif
+
+static inline int ppa_epp_out(unsigned short epp_p, unsigned short str_p, const char *buffer, int len)
+{
+ int i;
+ for (i = len; i; i--) {
+ outb(*buffer++, epp_p);
+#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
+ if (inb(str_p) & 0x01)
+ return 0;
+ #endif
+ }
+ return 1;
+ }
+
+static int ppa_out(int host_no, char *buffer, int len)
+{
+ int r;
+ unsigned short ppb = PPA_BASE(host_no);
+
+ r = ppa_wait(host_no);
+
+ if ((r & 0x50) != 0x40) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ case PPA_PS2:
+ /* 8 bit output, with a loop */
+ r = ppa_byte_out(ppb, buffer, len);
+ break;
+
+ case PPA_EPP_32:
+ case PPA_EPP_16:
+ case PPA_EPP_8:
+ epp_reset(ppb);
+ w_ctr(ppb, 0x4);
+#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
+ r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len);
+#else
+ if (!(((long) buffer | len) & 0x03))
+ outsl(ppb + 4, buffer, len >> 2);
+ else
+ outsb(ppb + 4, buffer, len);
+ w_ctr(ppb, 0xc);
+ r = !(r_str(ppb) & 0x01);
+#endif
+ w_ctr(ppb, 0xc);
+ ecp_sync(ppb);
+ break;
+
+ default:
+ printk("PPA: bug in ppa_out()\n");
+ r = 0;
+ }
+ return r;
+}
+
+static inline int ppa_epp_in(int epp_p, int str_p, char *buffer, int len)
+{
+ int i;
+ for (i = len; i; i--) {
+ *buffer++ = inb(epp_p);
+#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
+ if (inb(str_p) & 0x01)
+ return 0;
+#endif
+ }
+ return 1;
+ }
+
+static int ppa_in(int host_no, char *buffer, int len)
+{
+ int r;
+ unsigned short ppb = PPA_BASE(host_no);
+
+ r = ppa_wait(host_no);
+
+ if ((r & 0x50) != 0x50) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ /* 4 bit input, with a loop */
+ r = ppa_nibble_in(ppb + 1, buffer, len);
+ w_ctr(ppb, 0xc);
+ break;
+
+ case PPA_PS2:
+ /* 8 bit input, with a loop */
+ w_ctr(ppb, 0x25);
+ r = ppa_byte_in(ppb, buffer, len);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+ break;
+
+ case PPA_EPP_32:
+ case PPA_EPP_16:
+ case PPA_EPP_8:
+ epp_reset(ppb);
+ w_ctr(ppb, 0x24);
+#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
+ r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len);
+ #else
+ if (!(((long) buffer | len) & 0x03))
+ insl(ppb + 4, buffer, len >> 2);
+ else
+ insb(ppb + 4, buffer, len);
+ w_ctr(ppb, 0x2c);
+ r = !(r_str(ppb) & 0x01);
+#endif
+ w_ctr(ppb, 0x2c);
+ ecp_sync(ppb);
+ break;
+
+ default:
+ printk("PPA: bug in ppa_ins()\n");
+ r = 0;
+ break;
+ }
+ return r;
+}
+
+/* end of ppa_io.h */
+static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
+{
+ w_dtr(ppb, b);
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0xe);
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+}
+
+static void ppa_disconnect(int host_no)
+{
+ unsigned short ppb = PPA_BASE(host_no);
+
+ ppa_d_pulse(ppb, 0);
+ ppa_d_pulse(ppb, 0x3c);
+ ppa_d_pulse(ppb, 0x20);
+ ppa_d_pulse(ppb, 0xf);
+}
+
+static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
+{
+ w_dtr(ppb, b);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0x6);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+}
+
+static inline void ppa_connect(int host_no, int flag)
+{
+ unsigned short ppb = PPA_BASE(host_no);
+
+ ppa_c_pulse(ppb, 0);
+ ppa_c_pulse(ppb, 0x3c);
+ ppa_c_pulse(ppb, 0x20);
+ if ((flag == CONNECT_EPP_MAYBE) &&
+ IN_EPP_MODE(ppa_hosts[host_no].mode))
+ ppa_c_pulse(ppb, 0xcf);
+ else
+ ppa_c_pulse(ppb, 0x8f);
+}
+
+static int ppa_select(int host_no, int target)
+{
+ int k;
+ unsigned short ppb = PPA_BASE(host_no);
+
+ /*
+ * Bit 6 (0x40) is the device selected bit.
+ * First we must wait till the current device goes off line...
+ */
+ k = PPA_SELECT_TMO;
+ do {
+ k--;
+ } while ((r_str(ppb) & 0x40) && (k));
+ if (!k)
+ return 0;
+
+ w_dtr(ppb, (1 << target));
+ w_ctr(ppb, 0xe);
+ w_ctr(ppb, 0xc);
+ w_dtr(ppb, 0x80); /* This is NOT the initator */
+ w_ctr(ppb, 0x8);
+
+ k = PPA_SELECT_TMO;
+ do {
+ k--;
+ }
+ while (!(r_str(ppb) & 0x40) && (k));
+ if (!k)
+ return 0;
+
+ return 1;
+}
+
+/*
+ * This is based on a trace of what the Iomega DOS 'guest' driver does.
+ * I've tried several different kinds of parallel ports with guest and
+ * coded this to react in the same ways that it does.
+ *
+ * The return value from this function is just a hint about where the
+ * handshaking failed.
+ *
+ */
+static int ppa_init(int host_no)
+{
+ int retv;
+ unsigned short ppb = PPA_BASE(host_no);
+
+ ppa_disconnect(host_no);
+ ppa_connect(host_no, CONNECT_NORMAL);
+
+ retv = 2; /* Failed */
+
+ w_ctr(ppb, 0xe);
+ if ((r_str(ppb) & 0x08) == 0x08)
+ retv--;
+
+ w_ctr(ppb, 0xc);
+ if ((r_str(ppb) & 0x08) == 0x00)
+ retv--;
+
+ /* This is a SCSI BUS reset signal */
+ if (!retv) {
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000); /* Allow devices to settle down */
+ }
+ ppa_disconnect(host_no);
+ udelay(1000); /* Another delay to allow devices to settle */
+
+ if (!retv)
+ retv = device_check(host_no);
+
+ return retv;
+}
+
+static inline int ppa_send_command(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ int k;
+
+ w_ctr(PPA_BASE(host_no), 0x0c);
+
+ for (k = 0; k < cmd->cmd_len; k++)
+ if (!ppa_out(host_no, &cmd->cmnd[k], 1))
+ return 0;
+ return 1;
+}
+
+/*
+ * The bulk flag enables some optimisations in the data transfer loops,
+ * it should be true for any command that transfers data in integral
+ * numbers of sectors.
+ *
+ * The driver appears to remain stable if we speed up the parallel port
+ * i/o in this function, but not elsewhere.
+ */
+static int ppa_completion(Scsi_Cmnd * cmd)
+{
+ /* Return codes:
+ * -1 Error
+ * 0 Told to schedule
+ * 1 Finished data transfer
+ */
+ int host_no = cmd->host->unique_id;
+ unsigned short ppb = PPA_BASE(host_no);
+ unsigned long start_jiffies = jiffies;
+
+ unsigned char r, v;
+ int fast, bulk, status;
+
+ v = cmd->cmnd[0];
+ bulk = ((v == READ_6) ||
+ (v == READ_10) ||
+ (v == WRITE_6) ||
+ (v == WRITE_10));
+
+ /*
+ * We only get here if the drive is ready to comunicate,
+ * hence no need for a full ppa_wait.
+ */
+ r = (r_str(ppb) & 0xf0);
+
+ while (r != (unsigned char) 0xf0) {
+ /*
+ * If we have been running for more than a full timer tick
+ * then take a rest.
+ */
+ if (jiffies > start_jiffies + 1)
+ return 0;
+
+ if (((r & 0xc0) != 0xc0) || (cmd->SCp.this_residual <= 0)) {
+ ppa_fail(host_no, DID_ERROR);
+ return -1; /* ERROR_RETURN */
+ }
+ /* determine if we should use burst I/O */ fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
+ ? PPA_BURST_SIZE : 1;
+
+ if (r == (unsigned char) 0xc0)
+ status = ppa_out(host_no, cmd->SCp.ptr, fast);
+ else
+ status = ppa_in(host_no, cmd->SCp.ptr, fast);
+
+ cmd->SCp.ptr += fast;
+ cmd->SCp.this_residual -= fast;
+
+ if (!status) {
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return -1; /* ERROR_RETURN */
+ }
+ if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
+ /* if scatter/gather, advance to the next segment */
+ if (cmd->SCp.buffers_residual--) {
+ cmd->SCp.buffer++;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = cmd->SCp.buffer->address;
+ }
+ }
+ /* Now check to see if the drive is ready to comunicate */
+ r = (r_str(ppb) & 0xf0);
+ /* If not, drop back down to the scheduler and wait a timer tick */
+ if (!(r & 0x80))
+ return 0;
+ }
+ return 1; /* FINISH_RETURN */
+}
+
+/*
+ * Since the PPA itself doesn't generate interrupts, we use
+ * the scheduler's task queue to generate a stream of call-backs and
+ * complete the request when the drive is ready.
+ */
+static void ppa_interrupt(void *data)
+{
+ ppa_struct *tmp = (ppa_struct *) data;
+ Scsi_Cmnd *cmd = tmp->cur_cmd;
+
+ if (!cmd) {
+ printk("PPA: bug in ppa_interrupt\n");
+ return;
+ }
+ if (ppa_engine(tmp, cmd)) {
+ tmp->ppa_tq.data = (void *) tmp;
+ tmp->ppa_tq.sync = 0;
+ queue_task(&tmp->ppa_tq, &tq_timer);
+ return;
+ }
+ /* Command must of completed hence it is safe to let go... */
+#if PPA_DEBUG > 0
+ switch ((cmd->result >> 16) & 0xff) {
+ case DID_OK:
+ break;
+ case DID_NO_CONNECT:
+ printk("ppa: no device at SCSI ID %i\n", cmd->target);
+ break;
+ case DID_BUS_BUSY:
+ printk("ppa: BUS BUSY - EPP timeout detected\n");
+ break;
+ case DID_TIME_OUT:
+ printk("ppa: unknown timeout\n");
+ break;
+ case DID_ABORT:
+ printk("ppa: told to abort\n");
+ break;
+ case DID_PARITY:
+ printk("ppa: parity error (???)\n");
+ break;
+ case DID_ERROR:
+ printk("ppa: internal driver error\n");
+ break;
+ case DID_RESET:
+ printk("ppa: told to reset device\n");
+ break;
+ case DID_BAD_INTR:
+ printk("ppa: bad interrupt (???)\n");
+ break;
+ default:
+ printk("ppa: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
+ }
+ #endif
+
+ if (cmd->SCp.phase > 1)
+ ppa_disconnect(cmd->host->unique_id);
+
+ tmp->cur_cmd = 0;
+ cmd->scsi_done(cmd);
+ return;
+}
+
+static int ppa_engine(ppa_struct * tmp, Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ unsigned short ppb = PPA_BASE(host_no);
+ unsigned char l = 0, h = 0;
+ int retv;
+
+ /* First check for any errors that may have occurred
+ * Here we check for internal errors
+ */
+ if (tmp->failed)
+ return 0;
+
+ switch (cmd->SCp.phase) {
+ case 0: /* Phase 0 - Waiting for parport */
+ if ((jiffies - tmp->jstart) > HZ) {
+ /*
+ * We waited more than a second
+ * for parport to call us
+ */
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ }
+ return 1; /* wait until ppa_wakeup claims parport */
+ case 1: /* Phase 1 - Connected */
+ { /* Perform a sanity check for cable unplugged */
+ int retv = 2; /* Failed */
+
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+
+ w_ctr(ppb, 0xe);
+ if ((r_str(ppb) & 0x08) == 0x08)
+ retv--;
+
+ w_ctr(ppb, 0xc);
+ if ((r_str(ppb) & 0x08) == 0x00)
+ retv--;
+
+ if (retv)
+ if ((jiffies - tmp->jstart) > (1 * HZ)) {
+ printk("ppa: Parallel port cable is unplugged!!\n");
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ } else {
+ ppa_disconnect(host_no);
+ return 1; /* Try again in a jiffy */
+ }
+ cmd->SCp.phase++;
+ }
+
+ case 2: /* Phase 2 - We are now talking to the scsi bus */
+ if (!ppa_select(host_no, cmd->target)) {
+ ppa_fail(host_no, DID_NO_CONNECT);
+ return 0;
+ }
+ cmd->SCp.phase++;
+
+ case 3: /* Phase 3 - Ready to accept a command */
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ if (!ppa_send_command(cmd))
+ return 0;
+ cmd->SCp.phase++;
+
+ case 4: /* Phase 4 - Setup scatter/gather buffers */
+ if (cmd->use_sg) {
+ /* if many buffers are available, start filling the first */
+ cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = cmd->SCp.buffer->address;
+ } else {
+ /* else fill the only available buffer */
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.this_residual = cmd->request_bufflen;
+ cmd->SCp.ptr = cmd->request_buffer;
+ }
+ cmd->SCp.buffers_residual = cmd->use_sg;
+ cmd->SCp.phase++;
+
+ case 5: /* Phase 5 - Data transfer stage */
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ retv = ppa_completion(cmd);
+ if (retv == -1)
+ return 0;
+ if (retv == 0)
+ return 1;
+ cmd->SCp.phase++;
+
+ case 6: /* Phase 6 - Read status/message */
+ cmd->result = DID_OK << 16;
+ /* Check for data overrun */
+ if (ppa_wait(host_no) != (unsigned char) 0xf0) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ if (ppa_in(host_no, &l, 1)) { /* read status byte */
+ /* Check for optional message byte */
+ if (ppa_wait(host_no) == (unsigned char) 0xf0)
+ ppa_in(host_no, &h, 1);
+ cmd->result = (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
+ }
+ return 0; /* Finished */
+ break;
+
+ default:
+ printk("ppa: Invalid scsi phase\n");
+ }
+ return 0;
+}
+
+int ppa_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
+{
+ int host_no = cmd->host->unique_id;
+
+ if (ppa_hosts[host_no].cur_cmd) {
+ printk("PPA: bug in ppa_queuecommand\n");
+ return 0;
+ }
+ ppa_hosts[host_no].failed = 0;
+ ppa_hosts[host_no].jstart = jiffies;
+ ppa_hosts[host_no].cur_cmd = cmd;
+ cmd->scsi_done = done;
+ cmd->result = DID_ERROR << 16; /* default return code */
+ cmd->SCp.phase = 0; /* bus free */
+
+ ppa_pb_claim(host_no);
+
+ ppa_hosts[host_no].ppa_tq.data = ppa_hosts + host_no;
+ ppa_hosts[host_no].ppa_tq.sync = 0;
+ queue_task(&ppa_hosts[host_no].ppa_tq, &tq_immediate);
+ mark_bh(IMMEDIATE_BH);
+
+ return 0;
+}
+
+/*
+ * Apparently the disk->capacity attribute is off by 1 sector
+ * for all disk drives. We add the one here, but it should really
+ * be done in sd.c. Even if it gets fixed there, this will still
+ * work.
+ */
+int ppa_biosparam(Disk * disk, kdev_t dev, int ip[])
+{
+ ip[0] = 0x40;
+ ip[1] = 0x20;
+ ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
+ if (ip[2] > 1024) {
+ ip[0] = 0xff;
+ ip[1] = 0x3f;
+ ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
+ if (ip[2] > 1023)
+ ip[2] = 1023;
+ }
+ return 0;
+}
+
+int ppa_abort(Scsi_Cmnd * cmd)
+{
+ /*
+ * There is no method for aborting commands since Iomega
+ * have tied the SCSI_MESSAGE line high in the interface
+ */
+
+ switch (cmd->SCp.phase) {
+ case 0: /* Do not have access to parport */
+ case 1: /* Have not connected to interface */
+ cmd->result = DID_ABORT;
+ cmd->done(cmd);
+ return SCSI_ABORT_SUCCESS;
+ break;
+ default: /* SCSI command sent, can not abort */
+ return SCSI_ABORT_BUSY;
+ break;
+ }
+}
+
+int ppa_reset(Scsi_Cmnd * cmd, unsigned int x)
+{
+ int host_no = cmd->host->unique_id;
+ int ppb = PPA_BASE(host_no);
+
+ /*
+ * PHASE1:
+ * Bring the interface crashing down on whatever is running
+ * hopefully this will kill the request.
+ * Bring back up the interface, reset the drive (and anything
+ * attached for that manner)
+ */
+ if (cmd)
+ if (cmd->SCp.phase)
+ ppa_disconnect(cmd->host->unique_id);
+
+ ppa_connect(host_no, CONNECT_NORMAL);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x8);
+ udelay(30);
+ w_ctr(ppb, 0xc);
+ udelay(1000); /* delay for devices to settle down */
+ ppa_disconnect(host_no);
+ udelay(1000); /* Additional delay to allow devices to settle down */
+
+ /*
+ * PHASE2:
+ * Sanity check for the sake of mid-level driver
+ */
+ if (!cmd) {
+ printk("ppa bus reset called for invalid command.\n");
+ return SCSI_RESET_NOT_RUNNING;
+ }
+ /*
+ * PHASE3:
+ * Flag the current command as having died due to reset
+ */
+ ppa_connect(host_no, CONNECT_NORMAL);
+ ppa_fail(host_no, DID_RESET);
+
+ /* Since the command was already on the timer queue ppa_interrupt
+ * will be called shortly.
+ */
+ return SCSI_RESET_PENDING;
+}
+
+static int device_check(int host_no)
+{
+ /* This routine looks for a device and then attempts to use EPP
+ to send a command. If all goes as planned then EPP is available. */
+
+ static char cmd[6] =
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+ int loop, old_mode, status, k, ppb = PPA_BASE(host_no);
+ unsigned char l;
+
+ old_mode = ppa_hosts[host_no].mode;
+ for (loop = 0; loop < 8; loop++) {
+ /* Attempt to use EPP for Test Unit Ready */
+ if ((ppb & 0x0007) == 0x0000)
+ ppa_hosts[host_no].mode = PPA_EPP_32;
+
+ second_pass:
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+ /* Select SCSI device */
+ if (!ppa_select(host_no, loop)) {
+ ppa_disconnect(host_no);
+ continue;
+ }
+ printk("ppa: Found device at ID %i, Attempting to use %s\n", loop,
+ PPA_MODE_STRING[ppa_hosts[host_no].mode]);
+
+ /* Send SCSI command */
+ status = 1;
+ w_ctr(ppb, 0x0c);
+ for (l = 0; (l < 6) && (status); l++)
+ status = ppa_out(host_no, cmd, 1);
+
+ if (!status) {
+ ppa_disconnect(host_no);
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000);
+ ppa_disconnect(host_no);
+ udelay(1000);
+ if (ppa_hosts[host_no].mode == PPA_EPP_32) {
+ ppa_hosts[host_no].mode = old_mode;
+ goto second_pass;
+ }
+ printk("ppa: Unable to establish communication, aborting driver load.\n");
+ return 1;
+ }
+ w_ctr(ppb, 0x0c);
+ k = 1000000; /* 1 Second */
+ do {
+ l = r_str(ppb);
+ k--;
+ udelay(1);
+ } while (!(l & 0x80) && (k));
+
+ l &= 0xf0;
+
+ if (l != 0xf0) {
+ ppa_disconnect(host_no);
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000);
+ ppa_disconnect(host_no);
+ udelay(1000);
+ if (ppa_hosts[host_no].mode == PPA_EPP_32) {
+ ppa_hosts[host_no].mode = old_mode;
+ goto second_pass;
+ }
+ printk("ppa: Unable to establish communication, aborting driver load.\n");
+ return 1;
+ }
+ ppa_disconnect(host_no);
+ printk("ppa: Communication established with ID %i using %s\n", loop,
+ PPA_MODE_STRING[ppa_hosts[host_no].mode]);
+ return 0;
+ }
+ printk("ppa: No devices found, aborting driver load.\n");
+ return 1;
+}
+
+#define PPA_ID "ppa: "
+
+int port_probe(unsigned short port)
+{
+ int retv = 0;
+ unsigned char a, b, c;
+ unsigned int i, j;
+
+
+ printk(PPA_ID "Probing port %04x\n", port);
+
+/* ##### ###### ######
+ * # # # # # #
+ * # # # # #
+ * ##### ###### ######
+ * # # #
+ * # # # #
+ * ##### # #
+ */
+
+ outb(0x0c, port + 0x402);
+ outb(0x0c, port + 0x002);
+ outb(0x55, port);
+ a = inb(port);
+ if (a != 0x55)
+ return retv;
+ printk(PPA_ID " SPP port present\n");
+
+ retv += PPA_PROBE_SPP;
+
+/* ####### ##### ######
+ * # # # # #
+ * # # # #
+ * ##### # ######
+ * # # #
+ * # # # #
+ * ####### ##### #
+ */
+
+ for (i = 1024; i > 0; i--) { /* clear at most 1k of data from FIFO */
+ a = inb(port + 0x402);
+ if ((a & 0x03) == 0x03)
+ goto no_ecp;
+ if (a & 0x01)
+ break;
+ inb(port + 0x400); /* Remove byte from FIFO */
+ }
+
+ if (i <= 0)
+ goto no_ecp;
+
+ b = a ^ 3;
+ outb(b, port + 0x402);
+ c = inb(port + 0x402);
+
+ if (a == c) {
+ outb(0xc0, port + 0x402); /* FIFO test */
+ j = 0;
+ while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
+ inb(port + 0x400);
+ j++;
+ }
+ if (j >= 1024)
+ goto no_ecp;
+ i = 0;
+ j = 0;
+ while (!(inb(port + 0x402) & 0x02) && (j < 1024)) {
+ outb(0x00, port + 0x400);
+ i++;
+ j++;
+ }
+ if (j >= 1024)
+ goto no_ecp;
+ j = 0;
+ while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
+ inb(port + 0x400);
+ j++;
+ }
+ if (j >= 1024)
+ goto no_ecp;
+ printk(PPA_ID " ECP with a %i byte FIFO present\n", i);
+
+ retv += PPA_PROBE_ECR;
+ }
+/* ###### ##### #####
+ * # # # # # #
+ * # # # #
+ * ###### ##### #####
+ * # # #
+ * # # # #
+ * # ##### #######
+ */
+
+ no_ecp:
+ if (retv & PPA_PROBE_ECR)
+ outb(0x20, port + 0x402);
+
+ outb(0x55, port);
+ outb(0x0c, port + 2);
+ a = inb(port);
+ outb(0x55, port);
+ outb(0x2c, port + 2);
+ b = inb(port);
+ if (a != b) {
+ printk(PPA_ID " PS/2 bidirectional port present\n");
+ retv += PPA_PROBE_PS2;
+ }
+/* ####### ###### ######
+ * # # # # #
+ * # # # # #
+ * ##### ###### ######
+ * # # #
+ * # # #
+ * ####### # #
+ */
+
+ if (port & 0x007) {
+ printk(PPA_ID " EPP not supported at this address\n");
+ return retv;
+ }
+ if (retv & PPA_PROBE_ECR) {
+ for (i = 0x00; i < 0x80; i += 0x20) {
+ outb(i, port + 0x402);
+
+ a = inb(port + 1);
+ outb(a, port + 1);
+ outb(a & 0xfe, port + 1);
+ a = inb(port + 1);
+ if (!(a & 0x01)) {
+ printk(PPA_ID " Failed Intel bug check. (Phony EPP in ECP)\n");
+ return retv;
+ }
+ }
+ printk(PPA_ID " Passed Intel bug check.\n");
+ outb(0x80, port + 0x402);
+ }
+ a = inb(port + 1);
+ outb(a, port + 1);
+ outb(a & 0xfe, port + 1);
+ a = inb(port + 1);
+
+ if (a & 0x01) {
+ outb(0x0c, port + 0x402);
+ outb(0x0c, port + 0x002);
+ return retv;
+ }
+
+ outb(0x04, port + 2);
+ inb(port + 4);
+ a = inb(port + 1);
+ outb(a, port + 1);
+ outb(a & 0xfe, port + 1);
+
+ if (a & 0x01) {
+ printk(PPA_ID " EPP 1.9 with hardware direction protocol\n");
+ retv += PPA_PROBE_EPP19;
+ } else {
+ /* The EPP timeout bit was not set, this could either be:
+ * EPP 1.7
+ * EPP 1.9 with software direction
+ */
+ outb(0x24, port + 2);
+ inb(port + 4);
+ a = inb(port + 1);
+ outb(a, port + 1);
+ outb(a & 0xfe, port + 1);
+ if (a & 0x01) {
+ printk(PPA_ID " EPP 1.9 with software direction protocol\n");
+ retv += PPA_PROBE_EPP19;
+ } else {
+ printk(PPA_ID " EPP 1.7\n");
+ retv += PPA_PROBE_EPP17;
+ }
+ }
+
+ outb(0x0c, port + 0x402);
+ outb(0x0c, port + 0x002);
+ return retv;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 23:29:21 +0000