Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1675 insertions, 0 deletions

diff --git a/drivers/scsi/seagate.c b/drivers/scsi/seagate.c
new file mode 100644
index 000000000000..b362ff2811da
--- /dev/null
+++ b/drivers/scsi/seagate.c
@@ -0,0 +1,1675 @@
+/*
+ *    seagate.c Copyright (C) 1992, 1993 Drew Eckhardt
+ *      low level scsi driver for ST01/ST02, Future Domain TMC-885,
+ *      TMC-950 by Drew Eckhardt <drew@colorado.edu>
+ *
+ *      Note : TMC-880 boards don't work because they have two bits in
+ *              the status register flipped, I'll fix this "RSN"
+ *	[why do I have strong feeling that above message is from 1993? :-)
+ *	        pavel@ucw.cz]
+ *
+ *      This card does all the I/O via memory mapped I/O, so there is no need
+ *      to check or allocate a region of the I/O address space.
+ */
+
+/* 1996 - to use new read{b,w,l}, write{b,w,l}, and phys_to_virt
+ * macros, replaced assembler routines with C. There's probably a
+ * performance hit, but I only have a cdrom and can't tell. Define
+ * SEAGATE_USE_ASM if you want the old assembler code -- SJT
+ *
+ * 1998-jul-29 - created DPRINTK macros and made it work under 
+ * linux 2.1.112, simplified some #defines etc. <pavel@ucw.cz>
+ *
+ * Aug 2000 - aeb - deleted seagate_st0x_biosparam(). It would try to
+ * read the physical disk geometry, a bad mistake. Of course it doesn't
+ * matter much what geometry one invents, but on large disks it
+ * returned 256 (or more) heads, causing all kind of failures.
+ * Of course this means that people might see a different geometry now,
+ * so boot parameters may be necessary in some cases.
+ */
+
+/*
+ * Configuration :
+ * To use without BIOS -DOVERRIDE=base_address -DCONTROLLER=FD or SEAGATE
+ * -DIRQ will override the default of 5.
+ * Note: You can now set these options from the kernel's "command line".
+ * The syntax is:
+ *
+ *     st0x=ADDRESS,IRQ                (for a Seagate controller)
+ * or:
+ *     tmc8xx=ADDRESS,IRQ              (for a TMC-8xx or TMC-950 controller)
+ * eg:
+ *     tmc8xx=0xC8000,15
+ *
+ * will configure the driver for a TMC-8xx style controller using IRQ 15
+ * with a base address of 0xC8000.
+ *
+ * -DARBITRATE 
+ *      Will cause the host adapter to arbitrate for the
+ *      bus for better SCSI-II compatibility, rather than just
+ *      waiting for BUS FREE and then doing its thing.  Should
+ *      let us do one command per Lun when I integrate my
+ *      reorganization changes into the distribution sources.
+ *
+ * -DDEBUG=65535
+ *      Will activate debug code.
+ *
+ * -DFAST or -DFAST32 
+ *      Will use blind transfers where possible
+ *
+ * -DPARITY  
+ *      This will enable parity.
+ *
+ * -DSEAGATE_USE_ASM
+ *      Will use older seagate assembly code. should be (very small amount)
+ *      Faster.
+ *
+ * -DSLOW_RATE=50
+ *      Will allow compatibility with broken devices that don't
+ *      handshake fast enough (ie, some CD ROM's) for the Seagate
+ *      code.
+ *
+ *      50 is some number, It will let you specify a default
+ *      transfer rate if handshaking isn't working correctly.
+ *
+ * -DOLDCNTDATASCEME  There is a new sceme to set the CONTROL
+ *                    and DATA reigsters which complies more closely
+ *                    with the SCSI2 standard. This hopefully eliminates
+ *                    the need to swap the order these registers are
+ *                    'messed' with. It makes the following two options
+ *                    obsolete. To reenable the old sceme define this.
+ *
+ * The following to options are patches from the SCSI.HOWTO
+ *
+ * -DSWAPSTAT  This will swap the definitions for STAT_MSG and STAT_CD.
+ *
+ * -DSWAPCNTDATA  This will swap the order that seagate.c messes with
+ *                the CONTROL an DATA registers.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/signal.h>
+#include <linux/string.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/blkdev.h>
+#include <linux/stat.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "seagate.h"
+
+#include <scsi/scsi_ioctl.h>
+
+#ifdef DEBUG
+#define DPRINTK( when, msg... ) do { if ( (DEBUG & (when)) == (when) ) printk( msg ); } while (0)
+#else
+#define DPRINTK( when, msg... ) do { } while (0)
+#endif
+#define DANY( msg... ) DPRINTK( 0xffff, msg );
+
+#ifndef IRQ
+#define IRQ 5
+#endif
+
+#ifdef FAST32
+#define FAST
+#endif
+
+#undef LINKED			/* Linked commands are currently broken! */
+
+#if defined(OVERRIDE) && !defined(CONTROLLER)
+#error Please use -DCONTROLLER=SEAGATE or -DCONTROLLER=FD to override controller type
+#endif
+
+#ifndef __i386__
+#undef SEAGATE_USE_ASM
+#endif
+
+/*
+	Thanks to Brian Antoine for the example code in his Messy-Loss ST-01
+		driver, and Mitsugu Suzuki for information on the ST-01
+		SCSI host.
+*/
+
+/*
+	CONTROL defines
+*/
+
+#define CMD_RST 		0x01
+#define CMD_SEL 		0x02
+#define CMD_BSY 		0x04
+#define CMD_ATTN    		0x08
+#define CMD_START_ARB		0x10
+#define CMD_EN_PARITY		0x20
+#define CMD_INTR		0x40
+#define CMD_DRVR_ENABLE		0x80
+
+/*
+	STATUS
+*/
+#ifdef SWAPSTAT
+#define STAT_MSG		0x08
+#define STAT_CD			0x02
+#else
+#define STAT_MSG		0x02
+#define STAT_CD			0x08
+#endif
+
+#define STAT_BSY		0x01
+#define STAT_IO			0x04
+#define STAT_REQ		0x10
+#define STAT_SEL		0x20
+#define STAT_PARITY		0x40
+#define STAT_ARB_CMPL		0x80
+
+/* 
+	REQUESTS
+*/
+
+#define REQ_MASK (STAT_CD |  STAT_IO | STAT_MSG)
+#define REQ_DATAOUT 0
+#define REQ_DATAIN STAT_IO
+#define REQ_CMDOUT STAT_CD
+#define REQ_STATIN (STAT_CD | STAT_IO)
+#define REQ_MSGOUT (STAT_MSG | STAT_CD)
+#define REQ_MSGIN (STAT_MSG | STAT_CD | STAT_IO)
+
+extern volatile int seagate_st0x_timeout;
+
+#ifdef PARITY
+#define BASE_CMD CMD_EN_PARITY
+#else
+#define BASE_CMD  0
+#endif
+
+/*
+	Debugging code
+*/
+
+#define PHASE_BUS_FREE 1
+#define PHASE_ARBITRATION 2
+#define PHASE_SELECTION 4
+#define PHASE_DATAIN 8
+#define PHASE_DATAOUT 0x10
+#define PHASE_CMDOUT 0x20
+#define PHASE_MSGIN 0x40
+#define PHASE_MSGOUT 0x80
+#define PHASE_STATUSIN 0x100
+#define PHASE_ETC (PHASE_DATAIN | PHASE_DATAOUT | PHASE_CMDOUT | PHASE_MSGIN | PHASE_MSGOUT | PHASE_STATUSIN)
+#define PRINT_COMMAND 0x200
+#define PHASE_EXIT 0x400
+#define PHASE_RESELECT 0x800
+#define DEBUG_FAST 0x1000
+#define DEBUG_SG   0x2000
+#define DEBUG_LINKED	0x4000
+#define DEBUG_BORKEN	0x8000
+
+/* 
+ *	Control options - these are timeouts specified in .01 seconds.
+ */
+
+/* 30, 20 work */
+#define ST0X_BUS_FREE_DELAY 25
+#define ST0X_SELECTION_DELAY 25
+
+#define SEAGATE 1		/* these determine the type of the controller */
+#define FD	2
+
+#define ST0X_ID_STR	"Seagate ST-01/ST-02"
+#define FD_ID_STR	"TMC-8XX/TMC-950"
+
+static int internal_command (unsigned char target, unsigned char lun,
+			     const void *cmnd,
+			     void *buff, int bufflen, int reselect);
+
+static int incommand;		/* set if arbitration has finished
+				   and we are in some command phase. */
+
+static unsigned int base_address = 0;	/* Where the card ROM starts, used to 
+					   calculate memory mapped register
+					   location.  */
+
+static void __iomem *st0x_cr_sr;	/* control register write, status
+					   register read.  256 bytes in
+					   length.
+					   Read is status of SCSI BUS, as per 
+					   STAT masks.  */
+
+static void __iomem *st0x_dr;	/* data register, read write 256
+				   bytes in length.  */
+
+static volatile int st0x_aborted = 0;	/* set when we are aborted, ie by a
+					   time out, etc.  */
+
+static unsigned char controller_type = 0;	/* set to SEAGATE for ST0x
+						   boards or FD for TMC-8xx
+						   boards */
+static int irq = IRQ;
+
+module_param(base_address, uint, 0);
+module_param(controller_type, byte, 0);
+module_param(irq, int, 0);
+MODULE_LICENSE("GPL");
+
+
+#define retcode(result) (((result) << 16) | (message << 8) | status)
+#define STATUS ((u8) readb(st0x_cr_sr))
+#define DATA ((u8) readb(st0x_dr))
+#define WRITE_CONTROL(d) { writeb((d), st0x_cr_sr); }
+#define WRITE_DATA(d) { writeb((d), st0x_dr); }
+
+#ifndef OVERRIDE
+static unsigned int seagate_bases[] = {
+	0xc8000, 0xca000, 0xcc000,
+	0xce000, 0xdc000, 0xde000
+};
+
+typedef struct {
+	const unsigned char *signature;
+	unsigned offset;
+	unsigned length;
+	unsigned char type;
+} Signature;
+
+static Signature __initdata signatures[] = {
+	{"ST01 v1.7  (C) Copyright 1987 Seagate", 15, 37, SEAGATE},
+	{"SCSI BIOS 2.00  (C) Copyright 1987 Seagate", 15, 40, SEAGATE},
+
+/*
+ * The following two lines are NOT mistakes.  One detects ROM revision
+ * 3.0.0, the other 3.2.  Since seagate has only one type of SCSI adapter,
+ * and this is not going to change, the "SEAGATE" and "SCSI" together
+ * are probably "good enough"
+ */
+
+	{"SEAGATE SCSI BIOS ", 16, 17, SEAGATE},
+	{"SEAGATE SCSI BIOS ", 17, 17, SEAGATE},
+
+/*
+ * However, future domain makes several incompatible SCSI boards, so specific
+ * signatures must be used.
+ */
+
+	{"FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89", 5, 46, FD},
+	{"FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89", 5, 46, FD},
+	{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90", 5, 47, FD},
+	{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90", 5, 47, FD},
+	{"FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90", 5, 46, FD},
+	{"FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92", 5, 44, FD},
+	{"IBM F1 BIOS V1.1004/30/92", 5, 25, FD},
+	{"FUTURE DOMAIN TMC-950", 5, 21, FD},
+	/* Added for 2.2.16 by Matthias_Heidbrink@b.maus.de */
+	{"IBM F1 V1.2009/22/93", 5, 25, FD},
+};
+
+#define NUM_SIGNATURES (sizeof(signatures) / sizeof(Signature))
+#endif				/* n OVERRIDE */
+
+/*
+ * hostno stores the hostnumber, as told to us by the init routine.
+ */
+
+static int hostno = -1;
+static void seagate_reconnect_intr (int, void *, struct pt_regs *);
+static irqreturn_t do_seagate_reconnect_intr (int, void *, struct pt_regs *);
+
+#ifdef FAST
+static int fast = 1;
+#else
+#define fast 0
+#endif
+
+#ifdef SLOW_RATE
+/*
+ * Support for broken devices :
+ * The Seagate board has a handshaking problem.  Namely, a lack
+ * thereof for slow devices.  You can blast 600K/second through
+ * it if you are polling for each byte, more if you do a blind
+ * transfer.  In the first case, with a fast device, REQ will
+ * transition high-low or high-low-high before your loop restarts
+ * and you'll have no problems.  In the second case, the board
+ * will insert wait states for up to 13.2 usecs for REQ to
+ * transition low->high, and everything will work.
+ *
+ * However, there's nothing in the state machine that says
+ * you *HAVE* to see a high-low-high set of transitions before
+ * sending the next byte, and slow things like the Trantor CD ROMS
+ * will break because of this.
+ *
+ * So, we need to slow things down, which isn't as simple as it
+ * seems.  We can't slow things down period, because then people
+ * who don't recompile their kernels will shoot me for ruining
+ * their performance.  We need to do it on a case per case basis.
+ *
+ * The best for performance will be to, only for borken devices
+ * (this is stored on a per-target basis in the scsi_devices array)
+ *
+ * Wait for a low->high transition before continuing with that
+ * transfer.  If we timeout, continue anyways.  We don't need
+ * a long timeout, because REQ should only be asserted until the
+ * corresponding ACK is received and processed.
+ *
+ * Note that we can't use the system timer for this, because of
+ * resolution, and we *really* can't use the timer chip since
+ * gettimeofday() and the beeper routines use that.  So,
+ * the best thing for us to do will be to calibrate a timing
+ * loop in the initialization code using the timer chip before
+ * gettimeofday() can screw with it.
+ *
+ * FIXME: this is broken (not borken :-). Empty loop costs less than
+ * loop with ISA access in it! -- pavel@ucw.cz
+ */
+
+static int borken_calibration = 0;
+
+static void __init borken_init (void)
+{
+	register int count = 0, start = jiffies + 1, stop = start + 25;
+
+	/* FIXME: There may be a better approach, this is a straight port for
+	   now */
+	preempt_disable();
+	while (time_before (jiffies, start))
+		cpu_relax();
+	for (; time_before (jiffies, stop); ++count)
+		cpu_relax();
+	preempt_enable();
+
+/*
+ * Ok, we now have a count for .25 seconds.  Convert to a
+ * count per second and divide by transfer rate in K.  */
+
+	borken_calibration = (count * 4) / (SLOW_RATE * 1024);
+
+	if (borken_calibration < 1)
+		borken_calibration = 1;
+}
+
+static inline void borken_wait (void)
+{
+	register int count;
+
+	for (count = borken_calibration; count && (STATUS & STAT_REQ); --count)
+		cpu_relax();
+	     	
+#if (DEBUG & DEBUG_BORKEN)
+	if (count)
+		printk ("scsi%d : borken timeout\n", hostno);
+#endif
+}
+
+#endif				/* def SLOW_RATE */
+
+/* These beasts only live on ISA, and ISA means 8MHz. Each ULOOP()
+ * contains at least one ISA access, which takes more than 0.125
+ * usec. So if we loop 8 times time in usec, we are safe.
+ */
+
+#define ULOOP( i ) for (clock = i*8;;)
+#define TIMEOUT (!(clock--))
+
+int __init seagate_st0x_detect (Scsi_Host_Template * tpnt)
+{
+	struct Scsi_Host *instance;
+	int i, j;
+	unsigned long cr, dr;
+
+	tpnt->proc_name = "seagate";
+/*
+ *	First, we try for the manual override.
+ */
+	DANY ("Autodetecting ST0x / TMC-8xx\n");
+
+	if (hostno != -1) {
+		printk (KERN_ERR "seagate_st0x_detect() called twice?!\n");
+		return 0;
+	}
+
+/* If the user specified the controller type from the command line,
+   controller_type will be non-zero, so don't try to detect one */
+
+	if (!controller_type) {
+#ifdef OVERRIDE
+		base_address = OVERRIDE;
+		controller_type = CONTROLLER;
+
+		DANY ("Base address overridden to %x, controller type is %s\n",
+		      base_address,
+		      controller_type == SEAGATE ? "SEAGATE" : "FD");
+#else				/* OVERRIDE */
+/*
+ * 	To detect this card, we simply look for the signature
+ *      from the BIOS version notice in all the possible locations
+ *      of the ROM's.  This has a nice side effect of not trashing
+ *      any register locations that might be used by something else.
+ *
+ * XXX - note that we probably should be probing the address
+ * space for the on-board RAM instead.
+ */
+
+		for (i = 0; i < (sizeof (seagate_bases) / sizeof (unsigned int)); ++i) {
+			void __iomem *p = ioremap(seagate_bases[i], 0x2000);
+			if (!p)
+				continue;
+			for (j = 0; j < NUM_SIGNATURES; ++j)
+				if (check_signature(p + signatures[j].offset, signatures[j].signature, signatures[j].length)) {
+					base_address = seagate_bases[i];
+					controller_type = signatures[j].type;
+					break;
+				}
+			iounmap(p);
+		}
+#endif				/* OVERRIDE */
+	}
+	/* (! controller_type) */
+	tpnt->this_id = (controller_type == SEAGATE) ? 7 : 6;
+	tpnt->name = (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR;
+
+	if (!base_address) {
+		printk(KERN_INFO "seagate: ST0x/TMC-8xx not detected.\n");
+		return 0;
+	}
+
+	cr = base_address + (controller_type == SEAGATE ? 0x1a00 : 0x1c00);
+	dr = cr + 0x200;
+	st0x_cr_sr = ioremap(cr, 0x100);
+	st0x_dr = ioremap(dr, 0x100);
+
+	DANY("%s detected. Base address = %x, cr = %x, dr = %x\n",
+	      tpnt->name, base_address, cr, dr);
+
+	/*
+	 *	At all times, we will use IRQ 5.  Should also check for IRQ3
+	 *	if we lose our first interrupt.
+	 */
+	instance = scsi_register (tpnt, 0);
+	if (instance == NULL)
+		return 0;
+
+	hostno = instance->host_no;
+	if (request_irq (irq, do_seagate_reconnect_intr, SA_INTERRUPT, (controller_type == SEAGATE) ? "seagate" : "tmc-8xx", instance)) {
+		printk(KERN_ERR "scsi%d : unable to allocate IRQ%d\n", hostno, irq);
+		return 0;
+	}
+	instance->irq = irq;
+	instance->io_port = base_address;
+#ifdef SLOW_RATE
+	printk(KERN_INFO "Calibrating borken timer... ");
+	borken_init();
+	printk(" %d cycles per transfer\n", borken_calibration);
+#endif
+	printk (KERN_INFO "This is one second... ");
+	{
+		int clock;
+		ULOOP (1 * 1000 * 1000) {
+			STATUS;
+			if (TIMEOUT)
+				break;
+		}
+	}
+
+	printk ("done, %s options:"
+#ifdef ARBITRATE
+		" ARBITRATE"
+#endif
+#ifdef DEBUG
+		" DEBUG"
+#endif
+#ifdef FAST
+		" FAST"
+#ifdef FAST32
+		"32"
+#endif
+#endif
+#ifdef LINKED
+		" LINKED"
+#endif
+#ifdef PARITY
+		" PARITY"
+#endif
+#ifdef SEAGATE_USE_ASM
+		" SEAGATE_USE_ASM"
+#endif
+#ifdef SLOW_RATE
+		" SLOW_RATE"
+#endif
+#ifdef SWAPSTAT
+		" SWAPSTAT"
+#endif
+#ifdef SWAPCNTDATA
+		" SWAPCNTDATA"
+#endif
+		"\n", tpnt->name);
+	return 1;
+}
+
+static const char *seagate_st0x_info (struct Scsi_Host *shpnt)
+{
+	static char buffer[64];
+
+	snprintf(buffer, 64, "%s at irq %d, address 0x%05X",
+		 (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR,
+		 irq, base_address);
+	return buffer;
+}
+
+/*
+ * These are our saved pointers for the outstanding command that is
+ * waiting for a reconnect
+ */
+
+static unsigned char current_target, current_lun;
+static unsigned char *current_cmnd, *current_data;
+static int current_nobuffs;
+static struct scatterlist *current_buffer;
+static int current_bufflen;
+
+#ifdef LINKED
+/*
+ * linked_connected indicates whether or not we are currently connected to
+ * linked_target, linked_lun and in an INFORMATION TRANSFER phase,
+ * using linked commands.
+ */
+
+static int linked_connected = 0;
+static unsigned char linked_target, linked_lun;
+#endif
+
+static void (*done_fn) (Scsi_Cmnd *) = NULL;
+static Scsi_Cmnd *SCint = NULL;
+
+/*
+ * These control whether or not disconnect / reconnect will be attempted,
+ * or are being attempted.
+ */
+
+#define NO_RECONNECT    0
+#define RECONNECT_NOW   1
+#define CAN_RECONNECT   2
+
+/*
+ * LINKED_RIGHT indicates that we are currently connected to the correct target
+ * for this command, LINKED_WRONG indicates that we are connected to the wrong
+ * target. Note that these imply CAN_RECONNECT and require defined(LINKED).
+ */
+
+#define LINKED_RIGHT    3
+#define LINKED_WRONG    4
+
+/*
+ * This determines if we are expecting to reconnect or not.
+ */
+
+static int should_reconnect = 0;
+
+/*
+ * The seagate_reconnect_intr routine is called when a target reselects the
+ * host adapter.  This occurs on the interrupt triggered by the target
+ * asserting SEL.
+ */
+
+static irqreturn_t do_seagate_reconnect_intr(int irq, void *dev_id,
+						struct pt_regs *regs)
+{
+	unsigned long flags;
+	struct Scsi_Host *dev = dev_id;
+	
+	spin_lock_irqsave (dev->host_lock, flags);
+	seagate_reconnect_intr (irq, dev_id, regs);
+	spin_unlock_irqrestore (dev->host_lock, flags);
+	return IRQ_HANDLED;
+}
+
+static void seagate_reconnect_intr (int irq, void *dev_id, struct pt_regs *regs)
+{
+	int temp;
+	Scsi_Cmnd *SCtmp;
+
+	DPRINTK (PHASE_RESELECT, "scsi%d : seagate_reconnect_intr() called\n", hostno);
+
+	if (!should_reconnect)
+		printk(KERN_WARNING "scsi%d: unexpected interrupt.\n", hostno);
+	else {
+		should_reconnect = 0;
+
+		DPRINTK (PHASE_RESELECT, "scsi%d : internal_command(%d, %08x, %08x, RECONNECT_NOW\n", 
+			hostno, current_target, current_data, current_bufflen);
+
+		temp = internal_command (current_target, current_lun, current_cmnd, current_data, current_bufflen, RECONNECT_NOW);
+
+		if (msg_byte(temp) != DISCONNECT) {
+			if (done_fn) {
+				DPRINTK(PHASE_RESELECT, "scsi%d : done_fn(%d,%08x)", hostno, hostno, temp);
+				if (!SCint)
+					panic ("SCint == NULL in seagate");
+				SCtmp = SCint;
+				SCint = NULL;
+				SCtmp->result = temp;
+				done_fn(SCtmp);
+			} else
+				printk(KERN_ERR "done_fn() not defined.\n");
+		}
+	}
+}
+
+/*
+ * The seagate_st0x_queue_command() function provides a queued interface
+ * to the seagate SCSI driver.  Basically, it just passes control onto the
+ * seagate_command() function, after fixing it so that the done_fn()
+ * is set to the one passed to the function.  We have to be very careful,
+ * because there are some commands on some devices that do not disconnect,
+ * and if we simply call the done_fn when the command is done then another
+ * command is started and queue_command is called again...  We end up
+ * overflowing the kernel stack, and this tends not to be such a good idea.
+ */
+
+static int recursion_depth = 0;
+
+static int seagate_st0x_queue_command (Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
+{
+	int result, reconnect;
+	Scsi_Cmnd *SCtmp;
+
+	DANY ("seagate: que_command");
+	done_fn = done;
+	current_target = SCpnt->device->id;
+	current_lun = SCpnt->device->lun;
+	current_cmnd = SCpnt->cmnd;
+	current_data = (unsigned char *) SCpnt->request_buffer;
+	current_bufflen = SCpnt->request_bufflen;
+	SCint = SCpnt;
+	if (recursion_depth)
+		return 1;
+	recursion_depth++;
+	do {
+#ifdef LINKED
+		/*
+		 * Set linked command bit in control field of SCSI command.
+		 */
+
+		current_cmnd[SCpnt->cmd_len] |= 0x01;
+		if (linked_connected) {
+			DPRINTK (DEBUG_LINKED, "scsi%d : using linked commands, current I_T_L nexus is ", hostno);
+			if (linked_target == current_target && linked_lun == current_lun) 
+			{
+				DPRINTK(DEBUG_LINKED, "correct\n");
+				reconnect = LINKED_RIGHT;
+			} else {
+				DPRINTK(DEBUG_LINKED, "incorrect\n");
+				reconnect = LINKED_WRONG;
+			}
+		} else
+#endif				/* LINKED */
+			reconnect = CAN_RECONNECT;
+
+		result = internal_command(SCint->device->id, SCint->device->lun, SCint->cmnd,
+				      SCint->request_buffer, SCint->request_bufflen, reconnect);
+		if (msg_byte(result) == DISCONNECT)
+			break;
+		SCtmp = SCint;
+		SCint = NULL;
+		SCtmp->result = result;
+		done_fn(SCtmp);
+	}
+	while (SCint);
+	recursion_depth--;
+	return 0;
+}
+
+static int internal_command (unsigned char target, unsigned char lun,
+		  const void *cmnd, void *buff, int bufflen, int reselect)
+{
+	unsigned char *data = NULL;
+	struct scatterlist *buffer = NULL;
+	int clock, temp, nobuffs = 0, done = 0, len = 0;
+#ifdef DEBUG
+	int transfered = 0, phase = 0, newphase;
+#endif
+	register unsigned char status_read;
+	unsigned char tmp_data, tmp_control, status = 0, message = 0;
+	unsigned transfersize = 0, underflow = 0;
+#ifdef SLOW_RATE
+	int borken = (int) SCint->device->borken;	/* Does the current target require
+							   Very Slow I/O ?  */
+#endif
+
+	incommand = 0;
+	st0x_aborted = 0;
+
+#if (DEBUG & PRINT_COMMAND)
+	printk("scsi%d : target = %d, command = ", hostno, target);
+	print_command((unsigned char *) cmnd);
+#endif
+
+#if (DEBUG & PHASE_RESELECT)
+	switch (reselect) {
+	case RECONNECT_NOW:
+		printk("scsi%d : reconnecting\n", hostno);
+		break;
+#ifdef LINKED
+	case LINKED_RIGHT:
+		printk("scsi%d : connected, can reconnect\n", hostno);
+		break;
+	case LINKED_WRONG:
+		printk("scsi%d : connected to wrong target, can reconnect\n",
+			hostno);
+		break;
+#endif
+	case CAN_RECONNECT:
+		printk("scsi%d : allowed to reconnect\n", hostno);
+		break;
+	default:
+		printk("scsi%d : not allowed to reconnect\n", hostno);
+	}
+#endif
+
+	if (target == (controller_type == SEAGATE ? 7 : 6))
+		return DID_BAD_TARGET;
+
+	/*
+	 *	We work it differently depending on if this is is "the first time,"
+	 *      or a reconnect.  If this is a reselect phase, then SEL will
+	 *      be asserted, and we must skip selection / arbitration phases.
+	 */
+
+	switch (reselect) {
+	case RECONNECT_NOW:
+		DPRINTK (PHASE_RESELECT, "scsi%d : phase RESELECT \n", hostno);
+		/*
+		 *	At this point, we should find the logical or of our ID
+		 *	and the original target's ID on the BUS, with BSY, SEL,
+		 *	and I/O signals asserted.
+		 *
+		 *      After ARBITRATION phase is completed, only SEL, BSY,
+		 *	and the target ID are asserted.  A valid initiator ID
+		 *	is not on the bus until IO is asserted, so we must wait
+		 *	for that.
+		 */
+		ULOOP (100 * 1000) {
+			temp = STATUS;
+			if ((temp & STAT_IO) && !(temp & STAT_BSY))
+				break;
+			if (TIMEOUT) {
+				DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for IO .\n", hostno);
+				return (DID_BAD_INTR << 16);
+			}
+		}
+
+		/*
+		 *	After I/O is asserted by the target, we can read our ID
+		 *	and its ID off of the BUS.
+		 */
+
+		if (!((temp = DATA) & (controller_type == SEAGATE ? 0x80 : 0x40))) {
+			DPRINTK (PHASE_RESELECT, "scsi%d : detected reconnect request to different target.\n\tData bus = %d\n", hostno, temp);
+			return (DID_BAD_INTR << 16);
+		}
+
+		if (!(temp & (1 << current_target))) {
+			printk(KERN_WARNING "scsi%d : Unexpected reselect interrupt.  Data bus = %d\n", hostno, temp);
+			return (DID_BAD_INTR << 16);
+		}
+
+		buffer = current_buffer;
+		cmnd = current_cmnd;	/* WDE add */
+		data = current_data;	/* WDE add */
+		len = current_bufflen;	/* WDE add */
+		nobuffs = current_nobuffs;
+
+		/*
+		 *	We have determined that we have been selected.  At this
+		 *	point, we must respond to the reselection by asserting
+		 *	BSY ourselves
+		 */
+
+#if 1
+		WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | CMD_BSY);
+#else
+		WRITE_CONTROL (BASE_CMD | CMD_BSY);
+#endif
+
+		/*
+		 *	The target will drop SEL, and raise BSY, at which time
+		 *	we must drop BSY.
+		 */
+
+		ULOOP (100 * 1000) {
+			if (!(STATUS & STAT_SEL))
+				break;
+			if (TIMEOUT) {
+				WRITE_CONTROL (BASE_CMD | CMD_INTR);
+				DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for SEL.\n", hostno);
+				return (DID_BAD_INTR << 16);
+			}
+		}
+		WRITE_CONTROL (BASE_CMD);
+		/*
+		 *	At this point, we have connected with the target
+		 *	and can get on with our lives.
+		 */
+		break;
+	case CAN_RECONNECT:
+#ifdef LINKED
+		/*
+		 * This is a bletcherous hack, just as bad as the Unix #!
+		 * interpreter stuff. If it turns out we are using the wrong
+		 * I_T_L nexus, the easiest way to deal with it is to go into
+		 *  our INFORMATION TRANSFER PHASE code, send a ABORT
+		 * message on MESSAGE OUT phase, and then loop back to here.
+		 */
+connect_loop:
+#endif
+		DPRINTK (PHASE_BUS_FREE, "scsi%d : phase = BUS FREE \n", hostno);
+
+		/*
+		 *    BUS FREE PHASE
+		 *
+		 *      On entry, we make sure that the BUS is in a BUS FREE
+		 *      phase, by insuring that both BSY and SEL are low for
+		 *      at least one bus settle delay.  Several reads help
+		 *      eliminate wire glitch.
+		 */
+
+#ifndef ARBITRATE
+#error FIXME: this is broken: we may not use jiffies here - we are under cli(). It will hardlock.
+		clock = jiffies + ST0X_BUS_FREE_DELAY;
+
+		while (((STATUS | STATUS | STATUS) & (STAT_BSY | STAT_SEL)) && (!st0x_aborted) && time_before (jiffies, clock))
+			cpu_relax();
+
+		if (time_after (jiffies, clock))
+			return retcode (DID_BUS_BUSY);
+		else if (st0x_aborted)
+			return retcode (st0x_aborted);
+#endif
+		DPRINTK (PHASE_SELECTION, "scsi%d : phase = SELECTION\n", hostno);
+
+		clock = jiffies + ST0X_SELECTION_DELAY;
+
+		/*
+		 * Arbitration/selection procedure :
+		 * 1.  Disable drivers
+		 * 2.  Write HOST adapter address bit
+		 * 3.  Set start arbitration.
+		 * 4.  We get either ARBITRATION COMPLETE or SELECT at this
+		 *     point.
+		 * 5.  OR our ID and targets on bus.
+		 * 6.  Enable SCSI drivers and asserted SEL and ATTN
+		 */
+
+#ifdef ARBITRATE
+		/* FIXME: verify host lock is always held here */
+		WRITE_CONTROL(0);
+		WRITE_DATA((controller_type == SEAGATE) ? 0x80 : 0x40);
+		WRITE_CONTROL(CMD_START_ARB);
+
+		ULOOP (ST0X_SELECTION_DELAY * 10000) {
+			status_read = STATUS;
+			if (status_read & STAT_ARB_CMPL)
+				break;
+			if (st0x_aborted)	/* FIXME: What? We are going to do something even after abort? */
+				break;
+			if (TIMEOUT || (status_read & STAT_SEL)) {
+				printk(KERN_WARNING "scsi%d : arbitration lost or timeout.\n", hostno);
+				WRITE_CONTROL (BASE_CMD);
+				return retcode (DID_NO_CONNECT);
+			}
+		}
+		DPRINTK (PHASE_SELECTION, "scsi%d : arbitration complete\n", hostno);
+#endif
+
+		/*
+		 *    When the SCSI device decides that we're gawking at it, 
+		 *    it will respond by asserting BUSY on the bus.
+		 *
+		 *    Note : the Seagate ST-01/02 product manual says that we
+		 *    should twiddle the DATA register before the control
+		 *    register. However, this does not work reliably so we do
+		 *    it the other way around.
+		 *
+		 *    Probably could be a problem with arbitration too, we
+		 *    really should try this with a SCSI protocol or logic 
+		 *    analyzer to see what is going on.
+		 */
+		tmp_data = (unsigned char) ((1 << target) | (controller_type == SEAGATE ? 0x80 : 0x40));
+		tmp_control = BASE_CMD | CMD_DRVR_ENABLE | CMD_SEL | (reselect ? CMD_ATTN : 0);
+
+		/* FIXME: verify host lock is always held here */
+#ifdef OLDCNTDATASCEME
+#ifdef SWAPCNTDATA
+		WRITE_CONTROL (tmp_control);
+		WRITE_DATA (tmp_data);
+#else
+		WRITE_DATA (tmp_data);
+		WRITE_CONTROL (tmp_control);
+#endif
+#else
+		tmp_control ^= CMD_BSY;	/* This is guesswork. What used to be in driver    */
+		WRITE_CONTROL (tmp_control);	/* could never work: it sent data into control     */
+		WRITE_DATA (tmp_data);	/* register and control info into data. Hopefully  */
+		tmp_control ^= CMD_BSY;	/* fixed, but order of first two may be wrong.     */
+		WRITE_CONTROL (tmp_control);	/* -- pavel@ucw.cz   */
+#endif
+
+		ULOOP (250 * 1000) {
+			if (st0x_aborted) {
+				/*
+				 *	If we have been aborted, and we have a
+				 *	command in progress, IE the target 
+				 *	still has BSY asserted, then we will
+				 *	reset the bus, and notify the midlevel
+				 *	driver to expect sense.
+				 */
+
+				WRITE_CONTROL (BASE_CMD);
+				if (STATUS & STAT_BSY) {
+					printk(KERN_WARNING "scsi%d : BST asserted after we've been aborted.\n", hostno);
+					seagate_st0x_bus_reset(NULL);
+					return retcode (DID_RESET);
+				}
+				return retcode (st0x_aborted);
+			}
+			if (STATUS & STAT_BSY)
+				break;
+			if (TIMEOUT) {
+				DPRINTK (PHASE_SELECTION, "scsi%d : NO CONNECT with target %d, stat = %x \n", hostno, target, STATUS);
+				return retcode (DID_NO_CONNECT);
+			}
+		}
+
+		/* Establish current pointers.  Take into account scatter / gather */
+
+		if ((nobuffs = SCint->use_sg)) {
+#if (DEBUG & DEBUG_SG)
+			{
+				int i;
+				printk("scsi%d : scatter gather requested, using %d buffers.\n", hostno, nobuffs);
+				for (i = 0; i < nobuffs; ++i)
+					printk("scsi%d : buffer %d address = %p length = %d\n",
+					     hostno, i,
+					     page_address(buffer[i].page) + buffer[i].offset,
+					     buffer[i].length);
+			}
+#endif
+
+			buffer = (struct scatterlist *) SCint->buffer;
+			len = buffer->length;
+			data = page_address(buffer->page) + buffer->offset;
+		} else {
+			DPRINTK (DEBUG_SG, "scsi%d : scatter gather not requested.\n", hostno);
+			buffer = NULL;
+			len = SCint->request_bufflen;
+			data = (unsigned char *) SCint->request_buffer;
+		}
+
+		DPRINTK (PHASE_DATAIN | PHASE_DATAOUT, "scsi%d : len = %d\n",
+			 hostno, len);
+
+		break;
+#ifdef LINKED
+	case LINKED_RIGHT:
+		break;
+	case LINKED_WRONG:
+		break;
+#endif
+	}			/* end of switch(reselect) */
+
+	/*
+	 *    There are several conditions under which we wish to send a message :
+	 *      1.  When we are allowing disconnect / reconnect, and need to
+	 *	establish the I_T_L nexus via an IDENTIFY with the DiscPriv bit
+	 *	set.
+	 *
+	 *      2.  When we are doing linked commands, are have the wrong I_T_L
+	 *	nexus established and want to send an ABORT message.
+	 */
+
+	/* GCC does not like an ifdef inside a macro, so do it the hard way. */
+#ifdef LINKED
+	WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT)|| (reselect == LINKED_WRONG))? CMD_ATTN : 0));
+#else
+	WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT))? CMD_ATTN : 0));
+#endif
+
+	/*
+	 *    INFORMATION TRANSFER PHASE
+	 *
+	 *      The nasty looking read / write inline assembler loops we use for
+	 *      DATAIN and DATAOUT phases are approximately 4-5 times as fast as
+	 *      the 'C' versions - since we're moving 1024 bytes of data, this
+	 *      really adds up.
+	 *
+	 *      SJT: The nasty-looking assembler is gone, so it's slower.
+	 *
+	 */
+
+	DPRINTK (PHASE_ETC, "scsi%d : phase = INFORMATION TRANSFER\n", hostno);
+
+	incommand = 1;
+	transfersize = SCint->transfersize;
+	underflow = SCint->underflow;
+
+	/*
+	 *	Now, we poll the device for status information,
+	 *      and handle any requests it makes.  Note that since we are unsure
+	 *	of how much data will be flowing across the system, etc and
+	 *	cannot make reasonable timeouts, that we will instead have the
+	 *	midlevel driver handle any timeouts that occur in this phase.
+	 */
+
+	while (((status_read = STATUS) & STAT_BSY) && !st0x_aborted && !done) {
+#ifdef PARITY
+		if (status_read & STAT_PARITY) {
+			printk(KERN_ERR "scsi%d : got parity error\n", hostno);
+			st0x_aborted = DID_PARITY;
+		}
+#endif
+		if (status_read & STAT_REQ) {
+#if ((DEBUG & PHASE_ETC) == PHASE_ETC)
+			if ((newphase = (status_read & REQ_MASK)) != phase) {
+				phase = newphase;
+				switch (phase) {
+				case REQ_DATAOUT:
+					printk ("scsi%d : phase = DATA OUT\n", hostno);
+					break;
+				case REQ_DATAIN:
+					printk ("scsi%d : phase = DATA IN\n", hostno);
+					break;
+				case REQ_CMDOUT:
+					printk
+					    ("scsi%d : phase = COMMAND OUT\n", hostno);
+					break;
+				case REQ_STATIN:
+					printk ("scsi%d : phase = STATUS IN\n",	hostno);
+					break;
+				case REQ_MSGOUT:
+					printk
+					    ("scsi%d : phase = MESSAGE OUT\n", hostno);
+					break;
+				case REQ_MSGIN:
+					printk ("scsi%d : phase = MESSAGE IN\n", hostno);
+					break;
+				default:
+					printk ("scsi%d : phase = UNKNOWN\n", hostno);
+					st0x_aborted = DID_ERROR;
+				}
+			}
+#endif
+			switch (status_read & REQ_MASK) {
+			case REQ_DATAOUT:
+				/*
+				 * If we are in fast mode, then we simply splat
+				 * the data out in word-sized chunks as fast as
+				 * we can.
+				 */
+
+				if (!len) {
+#if 0
+					printk("scsi%d: underflow to target %d lun %d \n", hostno, target, lun);
+					st0x_aborted = DID_ERROR;
+					fast = 0;
+#endif
+					break;
+				}
+
+				if (fast && transfersize
+				    && !(len % transfersize)
+				    && (len >= transfersize)
+#ifdef FAST32
+				    && !(transfersize % 4)
+#endif
+				    ) {
+					DPRINTK (DEBUG_FAST,
+						 "scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
+						 "         len = %d, data = %08x\n",
+						 hostno, SCint->underflow,
+						 SCint->transfersize, len,
+						 data);
+
+			/* SJT: Start. Fast Write */
+#ifdef SEAGATE_USE_ASM
+					__asm__ ("cld\n\t"
+#ifdef FAST32
+						 "shr $2, %%ecx\n\t"
+						 "1:\t"
+						 "lodsl\n\t"
+						 "movl %%eax, (%%edi)\n\t"
+#else
+						 "1:\t"
+						 "lodsb\n\t"
+						 "movb %%al, (%%edi)\n\t"
+#endif
+						 "loop 1b;"
+				      /* output */ :
+				      /* input */ :"D" (st0x_dr),
+						 "S"
+						 (data),
+						 "c" (SCint->transfersize)
+/* clobbered */
+				      :	 "eax", "ecx",
+						 "esi");
+#else				/* SEAGATE_USE_ASM */
+					memcpy_toio(st0x_dr, data, transfersize);
+#endif				/* SEAGATE_USE_ASM */
+/* SJT: End */
+					len -= transfersize;
+					data += transfersize;
+					DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data);
+				} else {
+					/*
+					 *    We loop as long as we are in a 
+					 *    data out phase, there is data to
+					 *    send, and BSY is still active.
+					 */
+
+/* SJT: Start. Slow Write. */
+#ifdef SEAGATE_USE_ASM
+
+					int __dummy_1, __dummy_2;
+
+/*
+ *      We loop as long as we are in a data out phase, there is data to send, 
+ *      and BSY is still active.
+ */
+/* Local variables : len = ecx , data = esi, 
+                     st0x_cr_sr = ebx, st0x_dr =  edi
+*/
+					__asm__ (
+							/* Test for any data here at all. */
+							"orl %%ecx, %%ecx\n\t"
+							"jz 2f\n\t" "cld\n\t"
+/*                    "movl st0x_cr_sr, %%ebx\n\t"  */
+/*                    "movl st0x_dr, %%edi\n\t"  */
+							"1:\t"
+							"movb (%%ebx), %%al\n\t"
+							/* Test for BSY */
+							"test $1, %%al\n\t"
+							"jz 2f\n\t"
+							/* Test for data out phase - STATUS & REQ_MASK should be 
+							   REQ_DATAOUT, which is 0. */
+							"test $0xe, %%al\n\t"
+							"jnz 2f\n\t"
+							/* Test for REQ */
+							"test $0x10, %%al\n\t"
+							"jz 1b\n\t"
+							"lodsb\n\t"
+							"movb %%al, (%%edi)\n\t"
+							"loop 1b\n\t" "2:\n"
+				      /* output */ :"=S" (data), "=c" (len),
+							"=b"
+							(__dummy_1),
+							"=D" (__dummy_2)
+/* input */
+				      :		"0" (data), "1" (len),
+							"2" (st0x_cr_sr),
+							"3" (st0x_dr)
+/* clobbered */
+				      :		"eax");
+#else				/* SEAGATE_USE_ASM */
+					while (len) {
+						unsigned char stat;
+
+						stat = STATUS;
+						if (!(stat & STAT_BSY)
+						    || ((stat & REQ_MASK) !=
+							REQ_DATAOUT))
+							break;
+						if (stat & STAT_REQ) {
+							WRITE_DATA (*data++);
+							--len;
+						}
+					}
+#endif				/* SEAGATE_USE_ASM */
+/* SJT: End. */
+				}
+
+				if (!len && nobuffs) {
+					--nobuffs;
+					++buffer;
+					len = buffer->length;
+					data = page_address(buffer->page) + buffer->offset;
+					DPRINTK (DEBUG_SG,
+						 "scsi%d : next scatter-gather buffer len = %d address = %08x\n",
+						 hostno, len, data);
+				}
+				break;
+
+			case REQ_DATAIN:
+#ifdef SLOW_RATE
+				if (borken) {
+#if (DEBUG & (PHASE_DATAIN))
+					transfered += len;
+#endif
+					for (; len && (STATUS & (REQ_MASK | STAT_REQ)) == (REQ_DATAIN | STAT_REQ); --len) {
+						*data++ = DATA;
+						borken_wait();
+					}
+#if (DEBUG & (PHASE_DATAIN))
+					transfered -= len;
+#endif
+				} else
+#endif
+
+					if (fast && transfersize
+					    && !(len % transfersize)
+					    && (len >= transfersize)
+#ifdef FAST32
+					    && !(transfersize % 4)
+#endif
+				    ) {
+					DPRINTK (DEBUG_FAST,
+						 "scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
+						 "         len = %d, data = %08x\n",
+						 hostno, SCint->underflow,
+						 SCint->transfersize, len,
+						 data);
+
+/* SJT: Start. Fast Read */
+#ifdef SEAGATE_USE_ASM
+					__asm__ ("cld\n\t"
+#ifdef FAST32
+						 "shr $2, %%ecx\n\t"
+						 "1:\t"
+						 "movl (%%esi), %%eax\n\t"
+						 "stosl\n\t"
+#else
+						 "1:\t"
+						 "movb (%%esi), %%al\n\t"
+						 "stosb\n\t"
+#endif
+						 "loop 1b\n\t"
+				      /* output */ :
+				      /* input */ :"S" (st0x_dr),
+						 "D"
+						 (data),
+						 "c" (SCint->transfersize)
+/* clobbered */
+				      :	 "eax", "ecx",
+						 "edi");
+#else				/* SEAGATE_USE_ASM */
+					memcpy_fromio(data, st0x_dr, len);
+#endif				/* SEAGATE_USE_ASM */
+/* SJT: End */
+					len -= transfersize;
+					data += transfersize;
+#if (DEBUG & PHASE_DATAIN)
+					printk ("scsi%d: transfered += %d\n", hostno, transfersize);
+					transfered += transfersize;
+#endif
+
+					DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data);
+				} else {
+
+#if (DEBUG & PHASE_DATAIN)
+					printk ("scsi%d: transfered += %d\n", hostno, len);
+					transfered += len;	/* Assume we'll transfer it all, then
+								   subtract what we *didn't* transfer */
+#endif
+
+/*
+ *	We loop as long as we are in a data in phase, there is room to read,
+ *      and BSY is still active
+ */
+
+/* SJT: Start. */
+#ifdef SEAGATE_USE_ASM
+
+					int __dummy_3, __dummy_4;
+
+/* Dummy clobbering variables for the new gcc-2.95 */
+
+/*
+ *      We loop as long as we are in a data in phase, there is room to read, 
+ *      and BSY is still active
+ */
+					/* Local variables : ecx = len, edi = data
+					   esi = st0x_cr_sr, ebx = st0x_dr */
+					__asm__ (
+							/* Test for room to read */
+							"orl %%ecx, %%ecx\n\t"
+							"jz 2f\n\t" "cld\n\t"
+/*                "movl st0x_cr_sr, %%esi\n\t"  */
+/*                "movl st0x_dr, %%ebx\n\t"  */
+							"1:\t"
+							"movb (%%esi), %%al\n\t"
+							/* Test for BSY */
+							"test $1, %%al\n\t"
+							"jz 2f\n\t"
+							/* Test for data in phase - STATUS & REQ_MASK should be REQ_DATAIN, 
+							   = STAT_IO, which is 4. */
+							"movb $0xe, %%ah\n\t"
+							"andb %%al, %%ah\n\t"
+							"cmpb $0x04, %%ah\n\t"
+							"jne 2f\n\t"
+							/* Test for REQ */
+							"test $0x10, %%al\n\t"
+							"jz 1b\n\t"
+							"movb (%%ebx), %%al\n\t"
+							"stosb\n\t"
+							"loop 1b\n\t" "2:\n"
+				      /* output */ :"=D" (data), "=c" (len),
+							"=S"
+							(__dummy_3),
+							"=b" (__dummy_4)
+/* input */
+				      :		"0" (data), "1" (len),
+							"2" (st0x_cr_sr),
+							"3" (st0x_dr)
+/* clobbered */
+				      :		"eax");
+#else				/* SEAGATE_USE_ASM */
+					while (len) {
+						unsigned char stat;
+
+						stat = STATUS;
+						if (!(stat & STAT_BSY)
+						    || ((stat & REQ_MASK) !=
+							REQ_DATAIN))
+							break;
+						if (stat & STAT_REQ) {
+							*data++ = DATA;
+							--len;
+						}
+					}
+#endif				/* SEAGATE_USE_ASM */
+/* SJT: End. */
+#if (DEBUG & PHASE_DATAIN)
+					printk ("scsi%d: transfered -= %d\n", hostno, len);
+					transfered -= len;	/* Since we assumed all of Len got  *
+								   transfered, correct our mistake */
+#endif
+				}
+
+				if (!len && nobuffs) {
+					--nobuffs;
+					++buffer;
+					len = buffer->length;
+					data = page_address(buffer->page) + buffer->offset;
+					DPRINTK (DEBUG_SG, "scsi%d : next scatter-gather buffer len = %d address = %08x\n", hostno, len, data);
+				}
+				break;
+
+			case REQ_CMDOUT:
+				while (((status_read = STATUS) & STAT_BSY) &&
+				       ((status_read & REQ_MASK) == REQ_CMDOUT))
+					if (status_read & STAT_REQ) {
+						WRITE_DATA (*(const unsigned char *) cmnd);
+						cmnd = 1 + (const unsigned char *)cmnd;
+#ifdef SLOW_RATE
+						if (borken)
+							borken_wait ();
+#endif
+					}
+				break;
+
+			case REQ_STATIN:
+				status = DATA;
+				break;
+
+			case REQ_MSGOUT:
+				/*
+				 *	We can only have sent a MSG OUT if we
+				 *	requested to do this by raising ATTN.
+				 *	So, we must drop ATTN.
+				 */
+				WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE);
+				/*
+				 *	If we are reconnecting, then we must 
+				 *	send an IDENTIFY message in response
+				 *	to MSGOUT.
+				 */
+				switch (reselect) {
+				case CAN_RECONNECT:
+					WRITE_DATA (IDENTIFY (1, lun));
+					DPRINTK (PHASE_RESELECT | PHASE_MSGOUT, "scsi%d : sent IDENTIFY message.\n", hostno);
+					break;
+#ifdef LINKED
+				case LINKED_WRONG:
+					WRITE_DATA (ABORT);
+					linked_connected = 0;
+					reselect = CAN_RECONNECT;
+					goto connect_loop;
+					DPRINTK (PHASE_MSGOUT | DEBUG_LINKED, "scsi%d : sent ABORT message to cancel incorrect I_T_L nexus.\n", hostno);
+#endif					/* LINKED */
+					DPRINTK (DEBUG_LINKED, "correct\n");
+				default:
+					WRITE_DATA (NOP);
+					printk("scsi%d : target %d requested MSGOUT, sent NOP message.\n", hostno, target);
+				}
+				break;
+
+			case REQ_MSGIN:
+				switch (message = DATA) {
+				case DISCONNECT:
+					DANY("seagate: deciding to disconnect\n");
+					should_reconnect = 1;
+					current_data = data;	/* WDE add */
+					current_buffer = buffer;
+					current_bufflen = len;	/* WDE add */
+					current_nobuffs = nobuffs;
+#ifdef LINKED
+					linked_connected = 0;
+#endif
+					done = 1;
+					DPRINTK ((PHASE_RESELECT | PHASE_MSGIN), "scsi%d : disconnected.\n", hostno);
+					break;
+
+#ifdef LINKED
+				case LINKED_CMD_COMPLETE:
+				case LINKED_FLG_CMD_COMPLETE:
+#endif
+				case COMMAND_COMPLETE:
+					/*
+					 * Note : we should check for underflow here.
+					 */
+					DPRINTK(PHASE_MSGIN, "scsi%d : command complete.\n", hostno);
+					done = 1;
+					break;
+				case ABORT:
+					DPRINTK(PHASE_MSGIN, "scsi%d : abort message.\n", hostno);
+					done = 1;
+					break;
+				case SAVE_POINTERS:
+					current_buffer = buffer;
+					current_bufflen = len;	/* WDE add */
+					current_data = data;	/* WDE mod */
+					current_nobuffs = nobuffs;
+					DPRINTK (PHASE_MSGIN, "scsi%d : pointers saved.\n", hostno);
+					break;
+				case RESTORE_POINTERS:
+					buffer = current_buffer;
+					cmnd = current_cmnd;
+					data = current_data;	/* WDE mod */
+					len = current_bufflen;
+					nobuffs = current_nobuffs;
+					DPRINTK(PHASE_MSGIN, "scsi%d : pointers restored.\n", hostno);
+					break;
+				default:
+
+					/*
+					 *	IDENTIFY distinguishes itself
+					 *	from the other messages by 
+					 *	setting the high bit.
+					 *
+					 *      Note : we need to handle at 
+					 *	least one outstanding command
+					 *	per LUN, and need to hash the 
+					 *	SCSI command for that I_T_L
+					 *	nexus based on the known ID 
+					 *	(at this point) and LUN.
+					 */
+
+					if (message & 0x80) {
+						DPRINTK (PHASE_MSGIN, "scsi%d : IDENTIFY message received from id %d, lun %d.\n", hostno, target, message & 7);
+					} else {
+						/*
+						 *      We should go into a
+						 *	MESSAGE OUT phase, and
+						 *	send  a MESSAGE_REJECT
+						 *      if we run into a message 
+						 *	that we don't like.  The
+						 *	seagate driver needs 
+						 *	some serious 
+						 *	restructuring first
+						 *	though.
+						 */
+						DPRINTK (PHASE_MSGIN, "scsi%d : unknown message %d from target %d.\n", hostno, message, target);
+					}
+				}
+				break;
+			default:
+				printk(KERN_ERR "scsi%d : unknown phase.\n", hostno);
+				st0x_aborted = DID_ERROR;
+			}	/* end of switch (status_read &  REQ_MASK) */
+#ifdef SLOW_RATE
+			/*
+			 * I really don't care to deal with borken devices in
+			 * each single byte transfer case (ie, message in,
+			 * message out, status), so I'll do the wait here if 
+			 * necessary.
+			 */
+			if(borken)
+				borken_wait();
+#endif
+
+		}		/* if(status_read & STAT_REQ) ends */
+	}			/* while(((status_read = STATUS)...) ends */
+
+	DPRINTK(PHASE_DATAIN | PHASE_DATAOUT | PHASE_EXIT, "scsi%d : Transfered %d bytes\n", hostno, transfered);
+
+#if (DEBUG & PHASE_EXIT)
+#if 0				/* Doesn't work for scatter/gather */
+	printk("Buffer : \n");
+	for(i = 0; i < 20; ++i)
+		printk("%02x  ", ((unsigned char *) data)[i]);	/* WDE mod */
+	printk("\n");
+#endif
+	printk("scsi%d : status = ", hostno);
+	print_status(status);
+	printk(" message = %02x\n", message);
+#endif
+
+	/* We shouldn't reach this until *after* BSY has been deasserted */
+
+#ifdef LINKED
+	else
+	{
+		/*
+		 * Fix the message byte so that unsuspecting high level drivers
+		 * don't puke when they see a LINKED COMMAND message in place of
+		 * the COMMAND COMPLETE they may be expecting.  Shouldn't be
+		 * necessary, but it's better to be on the safe side.
+		 *
+		 * A non LINKED* message byte will indicate that the command
+		 * completed, and we are now disconnected.
+		 */
+
+		switch (message) {
+		case LINKED_CMD_COMPLETE:
+		case LINKED_FLG_CMD_COMPLETE:
+			message = COMMAND_COMPLETE;
+			linked_target = current_target;
+			linked_lun = current_lun;
+			linked_connected = 1;
+			DPRINTK (DEBUG_LINKED, "scsi%d : keeping I_T_L nexus established for linked command.\n", hostno);
+			/* We also will need to adjust status to accommodate intermediate
+			   conditions. */
+			if ((status == INTERMEDIATE_GOOD) || (status == INTERMEDIATE_C_GOOD))
+				status = GOOD;
+			break;
+			/*
+			 * We should also handle what are "normal" termination
+			 * messages here (ABORT, BUS_DEVICE_RESET?, and
+			 * COMMAND_COMPLETE individually, and flake if things
+			 * aren't right.
+			 */
+		default:
+			DPRINTK (DEBUG_LINKED, "scsi%d : closing I_T_L nexus.\n", hostno);
+			linked_connected = 0;
+		}
+	}
+#endif	/* LINKED */
+
+	if (should_reconnect) {
+		DPRINTK (PHASE_RESELECT, "scsi%d : exiting seagate_st0x_queue_command() with reconnect enabled.\n", hostno);
+		WRITE_CONTROL (BASE_CMD | CMD_INTR);
+	} else
+		WRITE_CONTROL (BASE_CMD);
+
+	return retcode (st0x_aborted);
+}				/* end of internal_command */
+
+static int seagate_st0x_abort (Scsi_Cmnd * SCpnt)
+{
+	st0x_aborted = DID_ABORT;
+	return SUCCESS;
+}
+
+#undef ULOOP
+#undef TIMEOUT
+
+/*
+ * the seagate_st0x_reset function resets the SCSI bus 
+ *
+ * May be called with SCpnt = NULL
+ */
+
+static int seagate_st0x_bus_reset(Scsi_Cmnd * SCpnt)
+{
+	/* No timeouts - this command is going to fail because it was reset. */
+	DANY ("scsi%d: Reseting bus... ", hostno);
+
+	/* assert  RESET signal on SCSI bus.  */
+	WRITE_CONTROL (BASE_CMD | CMD_RST);
+
+	udelay (20 * 1000);
+
+	WRITE_CONTROL (BASE_CMD);
+	st0x_aborted = DID_RESET;
+
+	DANY ("done.\n");
+	return SUCCESS;
+}
+
+static int seagate_st0x_host_reset(Scsi_Cmnd *SCpnt)
+{
+	return FAILED;
+}
+
+static int seagate_st0x_device_reset(Scsi_Cmnd *SCpnt)
+{
+	return FAILED;
+}
+
+static int seagate_st0x_release(struct Scsi_Host *shost)
+{
+	if (shost->irq)
+		free_irq(shost->irq, shost);
+	release_region(shost->io_port, shost->n_io_port);
+	return 0;
+}
+
+static Scsi_Host_Template driver_template = {
+	.detect         	= seagate_st0x_detect,
+	.release        	= seagate_st0x_release,
+	.info           	= seagate_st0x_info,
+	.queuecommand   	= seagate_st0x_queue_command,
+	.eh_abort_handler	= seagate_st0x_abort,
+	.eh_bus_reset_handler	= seagate_st0x_bus_reset,
+	.eh_host_reset_handler	= seagate_st0x_host_reset,
+	.eh_device_reset_handler = seagate_st0x_device_reset,
+	.can_queue      	= 1,
+	.this_id        	= 7,
+	.sg_tablesize   	= SG_ALL,
+	.cmd_per_lun    	= 1,
+	.use_clustering		= DISABLE_CLUSTERING,
+};
+#include "scsi_module.c"