Initial import

1 files changed, 3032 insertions, 0 deletions

diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
new file mode 100644
index 000000000..decdc71b6
--- /dev/null
+++ b/drivers/scsi/arm/fas216.c
@@ -0,0 +1,3032 @@
+/*
+ *  linux/drivers/acorn/scsi/fas216.c
+ *
+ *  Copyright (C) 1997-2003 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
+ * other sources, including:
+ *   the AMD Am53CF94 data sheet
+ *   the AMD Am53C94 data sheet
+ *
+ * This is a generic driver.  To use it, have a look at cumana_2.c.  You
+ * should define your own structure that overlays FAS216_Info, eg:
+ * struct my_host_data {
+ *    FAS216_Info info;
+ *    ... my host specific data ...
+ * };
+ *
+ * Changelog:
+ *  30-08-1997	RMK	Created
+ *  14-09-1997	RMK	Started disconnect support
+ *  08-02-1998	RMK	Corrected real DMA support
+ *  15-02-1998	RMK	Started sync xfer support
+ *  06-04-1998	RMK	Tightened conditions for printing incomplete
+ *			transfers
+ *  02-05-1998	RMK	Added extra checks in fas216_reset
+ *  24-05-1998	RMK	Fixed synchronous transfers with period >= 200ns
+ *  27-06-1998	RMK	Changed asm/delay.h to linux/delay.h
+ *  26-08-1998	RMK	Improved message support wrt MESSAGE_REJECT
+ *  02-04-2000	RMK	Converted to use the new error handling, and
+ *			automatically request sense data upon check
+ *			condition status from targets.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/ecard.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_host.h>
+#include "fas216.h"
+#include "scsi.h"
+
+/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
+ *  the data sheet.  This restriction is crazy, especially when
+ *  you only want to send 16 bytes!  What were the guys who
+ *  designed this chip on at that time?  Did they read the SCSI2
+ *  spec at all?  The following sections are taken from the SCSI2
+ *  standard (s2r10) concerning this:
+ *
+ * > IMPLEMENTORS NOTES:
+ * >   (1)  Re-negotiation at every selection is not recommended, since a
+ * >   significant performance impact is likely.
+ *
+ * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
+ * >  RESET message is received, until a hard reset condition occurs, or until one
+ * >  of the two SCSI devices elects to modify the agreement.  The default data
+ * >  transfer mode is asynchronous data transfer mode.  The default data transfer
+ * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
+ * >  reset condition.
+ *
+ *  In total, this means that once you have elected to use synchronous
+ *  transfers, you must always use DMA.
+ *
+ *  I was thinking that this was a good chip until I found this restriction ;(
+ */
+#define SCSI2_SYNC
+#undef  SCSI2_TAG
+
+#undef DEBUG_CONNECT
+#undef DEBUG_MESSAGES
+
+#undef CHECK_STRUCTURE
+
+#define LOG_CONNECT		(1 << 0)
+#define LOG_BUSSERVICE		(1 << 1)
+#define LOG_FUNCTIONDONE	(1 << 2)
+#define LOG_MESSAGES		(1 << 3)
+#define LOG_BUFFER		(1 << 4)
+#define LOG_ERROR		(1 << 8)
+
+static int level_mask = LOG_ERROR;
+
+module_param(level_mask, int, 0644);
+
+static int __init fas216_log_setup(char *str)
+{
+	char *s;
+
+	level_mask = 0;
+
+	while ((s = strsep(&str, ",")) != NULL) {
+		switch (s[0]) {
+		case 'a':
+			if (strcmp(s, "all") == 0)
+				level_mask |= -1;
+			break;
+		case 'b':
+			if (strncmp(s, "bus", 3) == 0)
+				level_mask |= LOG_BUSSERVICE;
+			if (strncmp(s, "buf", 3) == 0)
+				level_mask |= LOG_BUFFER;
+			break;
+		case 'c':
+			level_mask |= LOG_CONNECT;
+			break;
+		case 'e':
+			level_mask |= LOG_ERROR;
+			break;
+		case 'm':
+			level_mask |= LOG_MESSAGES;
+			break;
+		case 'n':
+			if (strcmp(s, "none") == 0)
+				level_mask = 0;
+			break;
+		case 's':
+			level_mask |= LOG_FUNCTIONDONE;
+			break;
+		}
+	}
+	return 1;
+}
+
+__setup("fas216_logging=", fas216_log_setup);
+
+static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
+{
+	unsigned int off = reg << info->scsi.io_shift;
+	return readb(info->scsi.io_base + off);
+}
+
+static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
+{
+	unsigned int off = reg << info->scsi.io_shift;
+	writeb(val, info->scsi.io_base + off);
+}
+
+static void fas216_dumpstate(FAS216_Info *info)
+{
+	unsigned char is, stat, inst;
+
+	is   = fas216_readb(info, REG_IS);
+	stat = fas216_readb(info, REG_STAT);
+	inst = fas216_readb(info, REG_INST);
+	
+	printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
+	       " INST=%02X IS=%02X CFIS=%02X",
+		fas216_readb(info, REG_CTCL),
+		fas216_readb(info, REG_CTCM),
+		fas216_readb(info, REG_CMD),  stat, inst, is,
+		fas216_readb(info, REG_CFIS));
+	printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
+		fas216_readb(info, REG_CNTL1),
+		fas216_readb(info, REG_CNTL2),
+		fas216_readb(info, REG_CNTL3),
+		fas216_readb(info, REG_CTCH));
+}
+
+static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
+{
+	printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
+		prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
+		SCp->buffers_residual, suffix);
+}
+
+#ifdef CHECK_STRUCTURE
+static void fas216_dumpinfo(FAS216_Info *info)
+{
+	static int used = 0;
+	int i;
+
+	if (used++)
+		return;
+
+	printk("FAS216_Info=\n");
+	printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
+		info->magic_start, info->host, info->SCpnt,
+		info->origSCpnt);
+	printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
+		info->scsi.io_shift, info->scsi.irq,
+		info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
+		info->scsi.cfg[3]);
+	printk("           type=%p phase=%X\n",
+		info->scsi.type, info->scsi.phase);
+	print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
+	printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
+		info->scsi.async_stp,
+		info->scsi.disconnectable, info->scsi.aborting);
+	printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
+	       "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
+		info->stats.queues, info->stats.removes, info->stats.fins,
+		info->stats.reads, info->stats.writes, info->stats.miscs,
+		info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
+		info->stats.host_resets);
+	printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
+		info->ifcfg.clockrate, info->ifcfg.select_timeout,
+		info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
+	for (i = 0; i < 8; i++) {
+		printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
+			i, info->busyluns[i], i,
+			info->device[i].disconnect_ok, info->device[i].stp,
+			info->device[i].sof, info->device[i].sync_state);
+	}
+	printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
+		info->dma.transfer_type, info->dma.setup,
+		info->dma.pseudo, info->dma.stop);
+	printk("    internal_done=%X magic_end=%lX }\n",
+		info->internal_done, info->magic_end);
+}
+
+static void __fas216_checkmagic(FAS216_Info *info, const char *func)
+{
+	int corruption = 0;
+	if (info->magic_start != MAGIC) {
+		printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
+		corruption++;
+	}
+	if (info->magic_end != MAGIC) {
+		printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
+		corruption++;
+	}
+	if (corruption) {
+		fas216_dumpinfo(info);
+		panic("scsi memory space corrupted in %s", func);
+	}
+}
+#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
+#else
+#define fas216_checkmagic(info)
+#endif
+
+static const char *fas216_bus_phase(int stat)
+{
+	static const char *phases[] = {
+		"DATA OUT", "DATA IN",
+		"COMMAND", "STATUS",
+		"MISC OUT", "MISC IN",
+		"MESG OUT", "MESG IN"
+	};
+
+	return phases[stat & STAT_BUSMASK];
+}
+
+static const char *fas216_drv_phase(FAS216_Info *info)
+{
+	static const char *phases[] = {
+		[PHASE_IDLE]		= "idle",
+		[PHASE_SELECTION]	= "selection",
+		[PHASE_COMMAND]		= "command",
+		[PHASE_DATAOUT]		= "data out",
+		[PHASE_DATAIN]		= "data in",
+		[PHASE_MSGIN]		= "message in",
+		[PHASE_MSGIN_DISCONNECT]= "disconnect",
+		[PHASE_MSGOUT_EXPECT]	= "expect message out",
+		[PHASE_MSGOUT]		= "message out",
+		[PHASE_STATUS]		= "status",
+		[PHASE_DONE]		= "done",
+	};
+
+	if (info->scsi.phase < ARRAY_SIZE(phases) &&
+	    phases[info->scsi.phase])
+		return phases[info->scsi.phase];
+	return "???";
+}
+
+static char fas216_target(FAS216_Info *info)
+{
+	if (info->SCpnt)
+		return '0' + info->SCpnt->device->id;
+	else
+		return 'H';
+}
+
+static void
+fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
+{
+	static char buf[1024];
+
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	printk("scsi%d.%c: %s", info->host->host_no, target, buf);
+}
+
+static void fas216_log_command(FAS216_Info *info, int level,
+			       struct scsi_cmnd *SCpnt, char *fmt, ...)
+{
+	va_list args;
+
+	if (level != 0 && !(level & level_mask))
+		return;
+
+	va_start(args, fmt);
+	fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
+	va_end(args);
+
+	scsi_print_command(SCpnt);
+}
+
+static void
+fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
+{
+	va_list args;
+
+	if (level != 0 && !(level & level_mask))
+		return;
+
+	if (target < 0)
+		target = 'H';
+	else
+		target += '0';
+
+	va_start(args, fmt);
+	fas216_do_log(info, target, fmt, args);
+	va_end(args);
+
+	printk("\n");
+}
+
+static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
+{
+	va_list args;
+
+	if (level != 0 && !(level & level_mask))
+		return;
+
+	va_start(args, fmt);
+	fas216_do_log(info, fas216_target(info), fmt, args);
+	va_end(args);
+
+	printk("\n");
+}
+
+#define PH_SIZE	32
+
+static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
+static int ph_ptr;
+
+static void add_debug_list(int stat, int ssr, int isr, int ph)
+{
+	ph_list[ph_ptr].stat = stat;
+	ph_list[ph_ptr].ssr = ssr;
+	ph_list[ph_ptr].isr = isr;
+	ph_list[ph_ptr].ph = ph;
+
+	ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
+}
+
+static struct { int command; void *from; } cmd_list[8];
+static int cmd_ptr;
+
+static void fas216_cmd(FAS216_Info *info, unsigned int command)
+{
+	cmd_list[cmd_ptr].command = command;
+	cmd_list[cmd_ptr].from = __builtin_return_address(0);
+
+	cmd_ptr = (cmd_ptr + 1) & 7;
+
+	fas216_writeb(info, REG_CMD, command);
+}
+
+static void print_debug_list(void)
+{
+	int i;
+
+	i = ph_ptr;
+
+	printk(KERN_ERR "SCSI IRQ trail\n");
+	do {
+		printk(" %02x:%02x:%02x:%1x",
+			ph_list[i].stat, ph_list[i].ssr,
+			ph_list[i].isr, ph_list[i].ph);
+		i = (i + 1) & (PH_SIZE - 1);
+		if (((i ^ ph_ptr) & 7) == 0)
+			printk("\n");
+	} while (i != ph_ptr);
+	if ((i ^ ph_ptr) & 7)
+		printk("\n");
+
+	i = cmd_ptr;
+	printk(KERN_ERR "FAS216 commands: ");
+	do {
+		printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
+		i = (i + 1) & 7;
+	} while (i != cmd_ptr);
+	printk("\n");
+}
+
+static void fas216_done(FAS216_Info *info, unsigned int result);
+
+/**
+ * fas216_get_last_msg - retrive last message from the list
+ * @info: interface to search
+ * @pos: current fifo position
+ *
+ * Retrieve a last message from the list, using position in fifo.
+ */
+static inline unsigned short
+fas216_get_last_msg(FAS216_Info *info, int pos)
+{
+	unsigned short packed_msg = NOP;
+	struct message *msg;
+	int msgnr = 0;
+
+	while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+		if (pos >= msg->fifo)
+			break;
+	}
+
+	if (msg) {
+		if (msg->msg[0] == EXTENDED_MESSAGE)
+			packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
+		else
+			packed_msg = msg->msg[0];
+	}
+
+	fas216_log(info, LOG_MESSAGES,
+		"Message: %04x found at position %02x\n", packed_msg, pos);
+
+	return packed_msg;
+}
+
+/**
+ * fas216_syncperiod - calculate STP register value
+ * @info: state structure for interface connected to device
+ * @ns: period in ns (between subsequent bytes)
+ *
+ * Calculate value to be loaded into the STP register for a given period
+ * in ns. Returns a value suitable for REG_STP.
+ */
+static int fas216_syncperiod(FAS216_Info *info, int ns)
+{
+	int value = (info->ifcfg.clockrate * ns) / 1000;
+
+	fas216_checkmagic(info);
+
+	if (value < 4)
+		value = 4;
+	else if (value > 35)
+		value = 35;
+
+	return value & 31;
+}
+
+/**
+ * fas216_set_sync - setup FAS216 chip for specified transfer period.
+ * @info: state structure for interface connected to device
+ * @target: target
+ *
+ * Correctly setup FAS216 chip for specified transfer period.
+ * Notes   : we need to switch the chip out of FASTSCSI mode if we have
+ *           a transfer period >= 200ns - otherwise the chip will violate
+ *           the SCSI timings.
+ */
+static void fas216_set_sync(FAS216_Info *info, int target)
+{
+	unsigned int cntl3;
+
+	fas216_writeb(info, REG_SOF, info->device[target].sof);
+	fas216_writeb(info, REG_STP, info->device[target].stp);
+
+	cntl3 = info->scsi.cfg[2];
+	if (info->device[target].period >= (200 / 4))
+		cntl3 = cntl3 & ~CNTL3_FASTSCSI;
+
+	fas216_writeb(info, REG_CNTL3, cntl3);
+}
+
+/* Synchronous transfer support
+ *
+ * Note: The SCSI II r10 spec says (5.6.12):
+ *
+ *  (2)  Due to historical problems with early host adapters that could
+ *  not accept an SDTR message, some targets may not initiate synchronous
+ *  negotiation after a power cycle as required by this standard.  Host
+ *  adapters that support synchronous mode may avoid the ensuing failure
+ *  modes when the target is independently power cycled by initiating a
+ *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
+ *  This approach increases the SCSI bus overhead and is not recommended
+ *  for new implementations.  The correct method is to respond to an
+ *  SDTR message with a MESSAGE REJECT message if the either the
+ *  initiator or target devices does not support synchronous transfers
+ *  or does not want to negotiate for synchronous transfers at the time.
+ *  Using the correct method assures compatibility with wide data
+ *  transfers and future enhancements.
+ *
+ * We will always initiate a synchronous transfer negotiation request on
+ * every INQUIRY or REQUEST SENSE message, unless the target itself has
+ * at some point performed a synchronous transfer negotiation request, or
+ * we have synchronous transfers disabled for this device.
+ */
+
+/**
+ * fas216_handlesync - Handle a synchronous transfer message
+ * @info: state structure for interface
+ * @msg: message from target
+ *
+ * Handle a synchronous transfer message from the target
+ */
+static void fas216_handlesync(FAS216_Info *info, char *msg)
+{
+	struct fas216_device *dev = &info->device[info->SCpnt->device->id];
+	enum { sync, async, none, reject } res = none;
+
+#ifdef SCSI2_SYNC
+	switch (msg[0]) {
+	case MESSAGE_REJECT:
+		/* Synchronous transfer request failed.
+		 * Note: SCSI II r10:
+		 *
+		 *  SCSI devices that are capable of synchronous
+		 *  data transfers shall not respond to an SDTR
+		 *  message with a MESSAGE REJECT message.
+		 *
+		 * Hence, if we get this condition, we disable
+		 * negotiation for this device.
+		 */
+		if (dev->sync_state == neg_inprogress) {
+			dev->sync_state = neg_invalid;
+			res = async;
+		}
+		break;
+
+	case EXTENDED_MESSAGE:
+		switch (dev->sync_state) {
+		/* We don't accept synchronous transfer requests.
+		 * Respond with a MESSAGE_REJECT to prevent a
+		 * synchronous transfer agreement from being reached.
+		 */
+		case neg_invalid:
+			res = reject;
+			break;
+
+		/* We were not negotiating a synchronous transfer,
+		 * but the device sent us a negotiation request.
+		 * Honour the request by sending back a SDTR
+		 * message containing our capability, limited by
+		 * the targets capability.
+		 */
+		default:
+			fas216_cmd(info, CMD_SETATN);
+			if (msg[4] > info->ifcfg.sync_max_depth)
+				msg[4] = info->ifcfg.sync_max_depth;
+			if (msg[3] < 1000 / info->ifcfg.clockrate)
+				msg[3] = 1000 / info->ifcfg.clockrate;
+
+			msgqueue_flush(&info->scsi.msgs);
+			msgqueue_addmsg(&info->scsi.msgs, 5,
+					EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
+					msg[3], msg[4]);
+			info->scsi.phase = PHASE_MSGOUT_EXPECT;
+
+			/* This is wrong.  The agreement is not in effect
+			 * until this message is accepted by the device
+			 */
+			dev->sync_state = neg_targcomplete;
+			res = sync;
+			break;
+
+		/* We initiated the synchronous transfer negotiation,
+		 * and have successfully received a response from the
+		 * target.  The synchronous transfer agreement has been
+		 * reached.  Note: if the values returned are out of our
+		 * bounds, we must reject the message.
+		 */
+		case neg_inprogress:
+			res = reject;
+			if (msg[4] <= info->ifcfg.sync_max_depth &&
+			    msg[3] >= 1000 / info->ifcfg.clockrate) {
+				dev->sync_state = neg_complete;
+				res = sync;
+			}
+			break;
+		}
+	}
+#else
+	res = reject;
+#endif
+
+	switch (res) {
+	case sync:
+		dev->period = msg[3];
+		dev->sof    = msg[4];
+		dev->stp    = fas216_syncperiod(info, msg[3] * 4);
+		fas216_set_sync(info, info->SCpnt->device->id);
+		break;
+
+	case reject:
+		fas216_cmd(info, CMD_SETATN);
+		msgqueue_flush(&info->scsi.msgs);
+		msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+
+	case async:
+		dev->period = info->ifcfg.asyncperiod / 4;
+		dev->sof    = 0;
+		dev->stp    = info->scsi.async_stp;
+		fas216_set_sync(info, info->SCpnt->device->id);
+		break;
+
+	case none:
+		break;
+	}
+}
+
+/**
+ * fas216_updateptrs - update data pointers after transfer suspended/paused
+ * @info: interface's local pointer to update
+ * @bytes_transferred: number of bytes transferred
+ *
+ * Update data pointers after transfer suspended/paused
+ */
+static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
+{
+	struct scsi_pointer *SCp = &info->scsi.SCp;
+
+	fas216_checkmagic(info);
+
+	BUG_ON(bytes_transferred < 0);
+
+	SCp->phase -= bytes_transferred;
+
+	while (bytes_transferred != 0) {
+		if (SCp->this_residual > bytes_transferred)
+			break;
+		/*
+		 * We have used up this buffer.  Move on to the
+		 * next buffer.
+		 */
+		bytes_transferred -= SCp->this_residual;
+		if (!next_SCp(SCp) && bytes_transferred) {
+			printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
+				info->host->host_no, '0' + info->SCpnt->device->id);
+			return;
+		}
+	}
+
+	SCp->this_residual -= bytes_transferred;
+	if (SCp->this_residual)
+		SCp->ptr += bytes_transferred;
+	else
+		SCp->ptr = NULL;
+}
+
+/**
+ * fas216_pio - transfer data off of/on to card using programmed IO
+ * @info: interface to transfer data to/from
+ * @direction: direction to transfer data (DMA_OUT/DMA_IN)
+ *
+ * Transfer data off of/on to card using programmed IO.
+ * Notes: this is incredibly slow.
+ */
+static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
+{
+	struct scsi_pointer *SCp = &info->scsi.SCp;
+
+	fas216_checkmagic(info);
+
+	if (direction == DMA_OUT)
+		fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
+	else
+		put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
+
+	if (SCp->this_residual == 0)
+		next_SCp(SCp);
+}
+
+static void fas216_set_stc(FAS216_Info *info, unsigned int length)
+{
+	fas216_writeb(info, REG_STCL, length);
+	fas216_writeb(info, REG_STCM, length >> 8);
+	fas216_writeb(info, REG_STCH, length >> 16);
+}
+
+static unsigned int fas216_get_ctc(FAS216_Info *info)
+{
+	return fas216_readb(info, REG_CTCL) +
+	       (fas216_readb(info, REG_CTCM) << 8) +
+	       (fas216_readb(info, REG_CTCH) << 16);
+}
+
+/**
+ * fas216_cleanuptransfer - clean up after a transfer has completed.
+ * @info: interface to clean up
+ *
+ * Update the data pointers according to the number of bytes transferred
+ * on the SCSI bus.
+ */
+static void fas216_cleanuptransfer(FAS216_Info *info)
+{
+	unsigned long total, residual, fifo;
+	fasdmatype_t dmatype = info->dma.transfer_type;
+
+	info->dma.transfer_type = fasdma_none;
+
+	/*
+	 * PIO transfers do not need to be cleaned up.
+	 */
+	if (dmatype == fasdma_pio || dmatype == fasdma_none)
+		return;
+
+	if (dmatype == fasdma_real_all)
+		total = info->scsi.SCp.phase;
+	else
+		total = info->scsi.SCp.this_residual;
+
+	residual = fas216_get_ctc(info);
+
+	fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+
+	fas216_log(info, LOG_BUFFER, "cleaning up from previous "
+		   "transfer: length 0x%06x, residual 0x%x, fifo %d",
+		   total, residual, fifo);
+
+	/*
+	 * If we were performing Data-Out, the transfer counter
+	 * counts down each time a byte is transferred by the
+	 * host to the FIFO.  This means we must include the
+	 * bytes left in the FIFO from the transfer counter.
+	 */
+	if (info->scsi.phase == PHASE_DATAOUT)
+		residual += fifo;
+
+	fas216_updateptrs(info, total - residual);
+}
+
+/**
+ * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
+ * @info: interface from which device disconnected from
+ *
+ * Start a DMA/PIO transfer off of/on to card
+ */
+static void fas216_transfer(FAS216_Info *info)
+{
+	fasdmadir_t direction;
+	fasdmatype_t dmatype;
+
+	fas216_log(info, LOG_BUFFER,
+		   "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
+		   info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
+		   info->scsi.SCp.phase);
+
+	if (!info->scsi.SCp.ptr) {
+		fas216_log(info, LOG_ERROR, "null buffer passed to "
+			   "fas216_starttransfer");
+		print_SCp(&info->scsi.SCp, "SCp: ", "\n");
+		print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
+		return;
+	}
+
+	/*
+	 * If we have a synchronous transfer agreement in effect, we must
+	 * use DMA mode.  If we are using asynchronous transfers, we may
+	 * use DMA mode or PIO mode.
+	 */
+	if (info->device[info->SCpnt->device->id].sof)
+		dmatype = fasdma_real_all;
+	else
+		dmatype = fasdma_pio;
+
+	if (info->scsi.phase == PHASE_DATAOUT)
+		direction = DMA_OUT;
+	else
+		direction = DMA_IN;
+
+	if (info->dma.setup)
+		dmatype = info->dma.setup(info->host, &info->scsi.SCp,
+					  direction, dmatype);
+	info->dma.transfer_type = dmatype;
+
+	if (dmatype == fasdma_real_all)
+		fas216_set_stc(info, info->scsi.SCp.phase);
+	else
+		fas216_set_stc(info, info->scsi.SCp.this_residual);
+
+	switch (dmatype) {
+	case fasdma_pio:
+		fas216_log(info, LOG_BUFFER, "PIO transfer");
+		fas216_writeb(info, REG_SOF, 0);
+		fas216_writeb(info, REG_STP, info->scsi.async_stp);
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		fas216_pio(info, direction);
+		break;
+
+	case fasdma_pseudo:
+		fas216_log(info, LOG_BUFFER, "pseudo transfer");
+		fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
+		info->dma.pseudo(info->host, &info->scsi.SCp,
+				 direction, info->SCpnt->transfersize);
+		break;
+
+	case fasdma_real_block:
+		fas216_log(info, LOG_BUFFER, "block dma transfer");
+		fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
+		break;
+
+	case fasdma_real_all:
+		fas216_log(info, LOG_BUFFER, "total dma transfer");
+		fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
+		break;
+
+	default:
+		fas216_log(info, LOG_BUFFER | LOG_ERROR,
+			   "invalid FAS216 DMA type");
+		break;
+	}
+}
+
+/**
+ * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
+ * @info: interface from which device disconnected from
+ *
+ * Called when we switch away from DATA IN or DATA OUT phases.
+ */
+static void fas216_stoptransfer(FAS216_Info *info)
+{
+	fas216_checkmagic(info);
+
+	if (info->dma.transfer_type == fasdma_real_all ||
+	    info->dma.transfer_type == fasdma_real_block)
+		info->dma.stop(info->host, &info->scsi.SCp);
+
+	fas216_cleanuptransfer(info);
+
+	if (info->scsi.phase == PHASE_DATAIN) {
+		unsigned int fifo;
+
+		/*
+		 * If we were performing Data-In, then the FIFO counter
+		 * contains the number of bytes not transferred via DMA
+		 * from the on-board FIFO.  Read them manually.
+		 */
+		fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+		while (fifo && info->scsi.SCp.ptr) {
+			*info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
+			fas216_updateptrs(info, 1);
+			fifo--;
+		}
+	} else {
+		/*
+		 * After a Data-Out phase, there may be unsent
+		 * bytes left in the FIFO.  Flush them out.
+		 */
+		fas216_cmd(info, CMD_FLUSHFIFO);
+	}
+}
+
+static void fas216_aborttransfer(FAS216_Info *info)
+{
+	fas216_checkmagic(info);
+
+	if (info->dma.transfer_type == fasdma_real_all ||
+	    info->dma.transfer_type == fasdma_real_block)
+		info->dma.stop(info->host, &info->scsi.SCp);
+
+	info->dma.transfer_type = fasdma_none;
+	fas216_cmd(info, CMD_FLUSHFIFO);
+}
+
+static void fas216_kick(FAS216_Info *info);
+
+/**
+ * fas216_disconnected_intr - handle device disconnection
+ * @info: interface from which device disconnected from
+ *
+ * Handle device disconnection
+ */
+static void fas216_disconnect_intr(FAS216_Info *info)
+{
+	unsigned long flags;
+
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
+		   info->scsi.phase);
+
+	msgqueue_flush(&info->scsi.msgs);
+
+	switch (info->scsi.phase) {
+	case PHASE_SELECTION:			/* while selecting - no target		*/
+	case PHASE_SELSTEPS:
+		fas216_done(info, DID_NO_CONNECT);
+		break;
+
+	case PHASE_MSGIN_DISCONNECT:		/* message in - disconnecting		*/
+		info->scsi.disconnectable = 1;
+		info->scsi.phase = PHASE_IDLE;
+		info->stats.disconnects += 1;
+		spin_lock_irqsave(&info->host_lock, flags);
+		if (info->scsi.phase == PHASE_IDLE)
+			fas216_kick(info);
+		spin_unlock_irqrestore(&info->host_lock, flags);
+		break;
+
+	case PHASE_DONE:			/* at end of command - complete		*/
+		fas216_done(info, DID_OK);
+		break;
+
+	case PHASE_MSGOUT:			/* message out - possible ABORT message	*/
+		if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
+			info->scsi.aborting = 0;
+			fas216_done(info, DID_ABORT);
+			break;
+		}
+
+	default:				/* huh?					*/
+		printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
+			info->host->host_no, fas216_target(info), fas216_drv_phase(info));
+		print_debug_list();
+		fas216_stoptransfer(info);
+		fas216_done(info, DID_ERROR);
+		break;
+	}
+}
+
+/**
+ * fas216_reselected_intr - start reconnection of a device
+ * @info: interface which was reselected
+ *
+ * Start reconnection of a device
+ */
+static void
+fas216_reselected_intr(FAS216_Info *info)
+{
+	unsigned int cfis, i;
+	unsigned char msg[4];
+	unsigned char target, lun, tag;
+
+	fas216_checkmagic(info);
+
+	WARN_ON(info->scsi.phase == PHASE_SELECTION ||
+		info->scsi.phase == PHASE_SELSTEPS);
+
+	cfis = fas216_readb(info, REG_CFIS);
+
+	fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
+		   info->scsi.phase, cfis);
+
+	cfis &= CFIS_CF;
+
+	if (cfis < 2 || cfis > 4) {
+		printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
+			info->host->host_no);
+		goto bad_message;
+	}
+
+	for (i = 0; i < cfis; i++)
+		msg[i] = fas216_readb(info, REG_FF);
+
+	if (!(msg[0] & (1 << info->host->this_id)) ||
+	    !(msg[1] & 0x80))
+		goto initiator_error;
+
+	target = msg[0] & ~(1 << info->host->this_id);
+	target = ffs(target) - 1;
+	lun = msg[1] & 7;
+	tag = 0;
+
+	if (cfis >= 3) {
+		if (msg[2] != SIMPLE_QUEUE_TAG)
+			goto initiator_error;
+
+		tag = msg[3];
+	}
+
+	/* set up for synchronous transfers */
+	fas216_writeb(info, REG_SDID, target);
+	fas216_set_sync(info, target);
+	msgqueue_flush(&info->scsi.msgs);
+
+	fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
+		   target, lun, tag);
+
+	if (info->scsi.disconnectable && info->SCpnt) {
+		info->scsi.disconnectable = 0;
+		if (info->SCpnt->device->id  == target &&
+		    info->SCpnt->device->lun == lun &&
+		    info->SCpnt->tag         == tag) {
+			fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
+		} else {
+			queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
+			fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
+			info->SCpnt = NULL;
+		}
+	}
+	if (!info->SCpnt) {
+		info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
+					target, lun, tag);
+		fas216_log(info, LOG_CONNECT, "had to get command");
+	}
+
+	if (info->SCpnt) {
+		/*
+		 * Restore data pointer from SAVED data pointer
+		 */
+		info->scsi.SCp = info->SCpnt->SCp;
+
+		fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
+			info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		info->scsi.phase = PHASE_MSGIN;
+	} else {
+		/*
+		 * Our command structure not found - abort the
+		 * command on the target.  Since we have no
+		 * record of this command, we can't send
+		 * an INITIATOR DETECTED ERROR message.
+		 */
+		fas216_cmd(info, CMD_SETATN);
+
+#if 0
+		if (tag)
+			msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
+		else
+#endif
+			msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		info->scsi.aborting = 1;
+	}
+
+	fas216_cmd(info, CMD_MSGACCEPTED);
+	return;
+
+ initiator_error:
+	printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
+		info->host->host_no);
+	for (i = 0; i < cfis; i++)
+		printk(" %02x", msg[i]);
+	printk("\n");
+ bad_message:
+	fas216_cmd(info, CMD_SETATN);
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
+	info->scsi.phase = PHASE_MSGOUT_EXPECT;
+	fas216_cmd(info, CMD_MSGACCEPTED);
+}
+
+static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
+{
+	int i;
+
+	switch (message[0]) {
+	case COMMAND_COMPLETE:
+		if (msglen != 1)
+			goto unrecognised;
+
+		printk(KERN_ERR "scsi%d.%c: command complete with no "
+			"status in MESSAGE_IN?\n",
+			info->host->host_no, fas216_target(info));
+		break;
+
+	case SAVE_POINTERS:
+		if (msglen != 1)
+			goto unrecognised;
+
+		/*
+		 * Save current data pointer to SAVED data pointer
+		 * SCSI II standard says that we must not acknowledge
+		 * this until we have really saved pointers.
+		 * NOTE: we DO NOT save the command nor status pointers
+		 * as required by the SCSI II standard.  These always
+		 * point to the start of their respective areas.
+		 */
+		info->SCpnt->SCp = info->scsi.SCp;
+		info->SCpnt->SCp.sent_command = 0;
+		fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
+			"save data pointers: [%p, %X]",
+			info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		break;
+
+	case RESTORE_POINTERS:
+		if (msglen != 1)
+			goto unrecognised;
+
+		/*
+		 * Restore current data pointer from SAVED data pointer
+		 */
+		info->scsi.SCp = info->SCpnt->SCp;
+		fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
+			"restore data pointers: [%p, 0x%x]",
+			info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		break;
+
+	case DISCONNECT:
+		if (msglen != 1)
+			goto unrecognised;
+
+		info->scsi.phase = PHASE_MSGIN_DISCONNECT;
+		break;
+
+	case MESSAGE_REJECT:
+		if (msglen != 1)
+			goto unrecognised;
+
+		switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
+		case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
+			fas216_handlesync(info, message);
+			break;
+
+		default:
+			fas216_log(info, 0, "reject, last message 0x%04x",
+				fas216_get_last_msg(info, info->scsi.msgin_fifo));
+		}
+		break;
+
+	case NOP:
+		break;
+
+	case EXTENDED_MESSAGE:
+		if (msglen < 3)
+			goto unrecognised;
+
+		switch (message[2]) {
+		case EXTENDED_SDTR:	/* Sync transfer negotiation request/reply */
+			fas216_handlesync(info, message);
+			break;
+
+		default:
+			goto unrecognised;
+		}
+		break;
+
+	default:
+		goto unrecognised;
+	}
+	return;
+
+unrecognised:
+	fas216_log(info, 0, "unrecognised message, rejecting");
+	printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
+	for (i = 0; i < msglen; i++)
+		printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
+	printk("\n");
+
+	/*
+	 * Something strange seems to be happening here -
+	 * I can't use SETATN since the chip gives me an
+	 * invalid command interrupt when I do.  Weird.
+	 */
+fas216_cmd(info, CMD_NOP);
+fas216_dumpstate(info);
+	fas216_cmd(info, CMD_SETATN);
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
+	info->scsi.phase = PHASE_MSGOUT_EXPECT;
+fas216_dumpstate(info);
+}
+
+static int fas216_wait_cmd(FAS216_Info *info, int cmd)
+{
+	int tout;
+	int stat;
+
+	fas216_cmd(info, cmd);
+
+	for (tout = 1000; tout; tout -= 1) {
+		stat = fas216_readb(info, REG_STAT);
+		if (stat & (STAT_INT|STAT_PARITYERROR))
+			break;
+		udelay(1);
+	}
+
+	return stat;
+}
+
+static int fas216_get_msg_byte(FAS216_Info *info)
+{
+	unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
+
+	if ((stat & STAT_INT) == 0)
+		goto timedout;
+
+	if ((stat & STAT_BUSMASK) != STAT_MESGIN)
+		goto unexpected_phase_change;
+
+	fas216_readb(info, REG_INST);
+
+	stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
+
+	if ((stat & STAT_INT) == 0)
+		goto timedout;
+
+	if (stat & STAT_PARITYERROR)
+		goto parity_error;
+
+	if ((stat & STAT_BUSMASK) != STAT_MESGIN)
+		goto unexpected_phase_change;
+
+	fas216_readb(info, REG_INST);
+
+	return fas216_readb(info, REG_FF);
+
+timedout:
+	fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
+	return -1;
+
+unexpected_phase_change:
+	fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
+	return -2;
+
+parity_error:
+	fas216_log(info, LOG_ERROR, "parity error during message in phase");
+	return -3;
+}
+
+/**
+ * fas216_message - handle a function done interrupt from FAS216 chip
+ * @info: interface which caused function done interrupt
+ *
+ * Handle a function done interrupt from FAS216 chip
+ */
+static void fas216_message(FAS216_Info *info)
+{
+	unsigned char *message = info->scsi.message;
+	unsigned int msglen = 1;
+	int msgbyte = 0;
+
+	fas216_checkmagic(info);
+
+	message[0] = fas216_readb(info, REG_FF);
+
+	if (message[0] == EXTENDED_MESSAGE) {
+		msgbyte = fas216_get_msg_byte(info);
+
+		if (msgbyte >= 0) {
+			message[1] = msgbyte;
+
+			for (msglen = 2; msglen < message[1] + 2; msglen++) {
+				msgbyte = fas216_get_msg_byte(info);
+
+				if (msgbyte >= 0)
+					message[msglen] = msgbyte;
+				else
+					break;
+			}
+		}
+	}
+
+	if (msgbyte == -3)
+		goto parity_error;
+
+#ifdef DEBUG_MESSAGES
+	{
+		int i;
+
+		printk("scsi%d.%c: message in: ",
+			info->host->host_no, fas216_target(info));
+		for (i = 0; i < msglen; i++)
+			printk("%02X ", message[i]);
+		printk("\n");
+	}
+#endif
+
+	fas216_parse_message(info, message, msglen);
+	fas216_cmd(info, CMD_MSGACCEPTED);
+	return;
+
+parity_error:
+	fas216_cmd(info, CMD_SETATN);
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
+	info->scsi.phase = PHASE_MSGOUT_EXPECT;
+	fas216_cmd(info, CMD_MSGACCEPTED);
+	return;
+}
+
+/**
+ * fas216_send_command - send command after all message bytes have been sent
+ * @info: interface which caused bus service
+ *
+ * Send a command to a target after all message bytes have been sent
+ */
+static void fas216_send_command(FAS216_Info *info)
+{
+	int i;
+
+	fas216_checkmagic(info);
+
+	fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	/* load command */
+	for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
+		fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
+
+	fas216_cmd(info, CMD_TRANSFERINFO);
+
+	info->scsi.phase = PHASE_COMMAND;
+}
+
+/**
+ * fas216_send_messageout - handle bus service to send a message
+ * @info: interface which caused bus service
+ *
+ * Handle bus service to send a message.
+ * Note: We do not allow the device to change the data direction!
+ */
+static void fas216_send_messageout(FAS216_Info *info, int start)
+{
+	unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
+
+	fas216_checkmagic(info);
+
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	if (tot_msglen) {
+		struct message *msg;
+		int msgnr = 0;
+
+		while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+			int i;
+
+			for (i = start; i < msg->length; i++)
+				fas216_writeb(info, REG_FF, msg->msg[i]);
+
+			msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
+			start = 0;
+		}
+	} else
+		fas216_writeb(info, REG_FF, NOP);
+
+	fas216_cmd(info, CMD_TRANSFERINFO);
+
+	info->scsi.phase = PHASE_MSGOUT;
+}
+
+/**
+ * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
+ * @info: interface which caused bus service interrupt
+ * @stat: Status register contents
+ * @is: SCSI Status register contents
+ *
+ * Handle a bus service interrupt from FAS216 chip
+ */
+static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
+{
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_BUSSERVICE,
+		   "bus service: stat=%02x is=%02x phase=%02x",
+		   stat, is, info->scsi.phase);
+
+	switch (info->scsi.phase) {
+	case PHASE_SELECTION:
+		if ((is & IS_BITS) != IS_MSGBYTESENT)
+			goto bad_is;
+		break;
+
+	case PHASE_SELSTEPS:
+		switch (is & IS_BITS) {
+		case IS_SELARB:
+		case IS_MSGBYTESENT:
+			goto bad_is;
+
+		case IS_NOTCOMMAND:
+		case IS_EARLYPHASE:
+			if ((stat & STAT_BUSMASK) == STAT_MESGIN)
+				break;
+			goto bad_is;
+
+		case IS_COMPLETE:
+			break;
+		}
+
+	default:
+		break;
+	}
+
+	fas216_cmd(info, CMD_NOP);
+
+#define STATE(st,ph) ((ph) << 3 | (st))
+	/* This table describes the legal SCSI state transitions,
+	 * as described by the SCSI II spec.
+	 */
+	switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
+	case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
+	case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
+	case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
+	case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
+		info->scsi.phase = PHASE_DATAIN;
+		fas216_transfer(info);
+		return;
+
+	case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
+	case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
+		fas216_cleanuptransfer(info);
+		fas216_transfer(info);
+		return;
+
+	case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
+	case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
+	case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
+	case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
+		fas216_cmd(info, CMD_FLUSHFIFO);
+		info->scsi.phase = PHASE_DATAOUT;
+		fas216_transfer(info);
+		return;
+
+	case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
+	case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
+		fas216_stoptransfer(info);
+	case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
+	case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
+	case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
+	case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
+		fas216_cmd(info, CMD_INITCMDCOMPLETE);
+		info->scsi.phase = PHASE_STATUS;
+		return;
+
+	case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
+	case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
+		fas216_stoptransfer(info);
+	case STATE(STAT_MESGIN, PHASE_COMMAND):	/* Command	-> Message In	*/
+	case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
+	case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
+		info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+		fas216_cmd(info, CMD_FLUSHFIFO);
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		info->scsi.phase = PHASE_MSGIN;
+		return;
+
+	case STATE(STAT_MESGIN, PHASE_MSGIN):
+		info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		return;
+
+	case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
+	case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
+		fas216_send_command(info);
+		info->scsi.phase = PHASE_COMMAND;
+		return;
+
+
+	/*
+	 * Selection    -> Message Out
+	 */
+	case STATE(STAT_MESGOUT, PHASE_SELECTION):
+		fas216_send_messageout(info, 1);
+		return;
+
+	/*
+	 * Message Out  -> Message Out
+	 */
+	case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
+	case STATE(STAT_MESGOUT, PHASE_MSGOUT):
+		/*
+		 * If we get another message out phase, this usually
+		 * means some parity error occurred.  Resend complete
+		 * set of messages.  If we have more than one byte to
+		 * send, we need to assert ATN again.
+		 */
+		if (info->device[info->SCpnt->device->id].parity_check) {
+			/*
+			 * We were testing... good, the device
+			 * supports parity checking.
+			 */
+			info->device[info->SCpnt->device->id].parity_check = 0;
+			info->device[info->SCpnt->device->id].parity_enabled = 1;
+			fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+		}
+
+		if (msgqueue_msglength(&info->scsi.msgs) > 1)
+			fas216_cmd(info, CMD_SETATN);
+		/*FALLTHROUGH*/
+
+	/*
+	 * Any          -> Message Out
+	 */
+	case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
+		fas216_send_messageout(info, 0);
+		return;
+
+	/* Error recovery rules.
+	 *   These either attempt to abort or retry the operation.
+	 * TODO: we need more of these
+	 */
+	case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
+		/* error - we've sent out all the command bytes
+		 * we have.
+		 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
+		 * to include the command bytes sent for this to work
+		 * correctly.
+		 */
+		printk(KERN_ERR "scsi%d.%c: "
+			"target trying to receive more command bytes\n",
+			info->host->host_no, fas216_target(info));
+		fas216_cmd(info, CMD_SETATN);
+		fas216_set_stc(info, 15);
+		fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
+		msgqueue_flush(&info->scsi.msgs);
+		msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		return;
+	}
+
+	if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
+		printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
+			info->host->host_no, fas216_target(info),
+			fas216_bus_phase(stat));
+		msgqueue_flush(&info->scsi.msgs);
+		fas216_cmd(info, CMD_SETATN);
+		msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		info->scsi.aborting = 1;
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		return;
+	}
+	printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
+		info->host->host_no, fas216_target(info),
+		fas216_bus_phase(stat),
+		fas216_drv_phase(info));
+	print_debug_list();
+	return;
+
+bad_is:
+	fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
+	fas216_dumpstate(info);
+	print_debug_list();
+
+	fas216_done(info, DID_ERROR);
+}
+
+/**
+ * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
+ * @info: interface which caused function done interrupt
+ * @stat: Status register contents
+ * @is: SCSI Status register contents
+ *
+ * Handle a function done interrupt from FAS216 chip
+ */
+static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
+{
+	unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
+
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_FUNCTIONDONE,
+		   "function done: stat=%02x is=%02x phase=%02x",
+		   stat, is, info->scsi.phase);
+
+	switch (info->scsi.phase) {
+	case PHASE_STATUS:			/* status phase - read status and msg	*/
+		if (fifo_len != 2) {
+			fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
+		}
+		/*
+		 * Read status then message byte.
+		 */
+		info->scsi.SCp.Status = fas216_readb(info, REG_FF);
+		info->scsi.SCp.Message = fas216_readb(info, REG_FF);
+		info->scsi.phase = PHASE_DONE;
+		fas216_cmd(info, CMD_MSGACCEPTED);
+		break;
+
+	case PHASE_IDLE:
+	case PHASE_SELECTION:
+	case PHASE_SELSTEPS:
+		break;
+
+	case PHASE_MSGIN:			/* message in phase			*/
+		if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
+			info->scsi.msgin_fifo = fifo_len;
+			fas216_message(info);
+			break;
+		}
+
+	default:
+		fas216_log(info, 0, "internal phase %s for function done?"
+			"  What do I do with this?",
+			fas216_target(info), fas216_drv_phase(info));
+	}
+}
+
+static void fas216_bus_reset(FAS216_Info *info)
+{
+	neg_t sync_state;
+	int i;
+
+	msgqueue_flush(&info->scsi.msgs);
+
+	sync_state = neg_invalid;
+
+#ifdef SCSI2_SYNC
+	if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
+		sync_state = neg_wait;
+#endif
+
+	info->scsi.phase = PHASE_IDLE;
+	info->SCpnt = NULL; /* bug! */
+	memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
+
+	for (i = 0; i < 8; i++) {
+		info->device[i].disconnect_ok	= info->ifcfg.disconnect_ok;
+		info->device[i].sync_state	= sync_state;
+		info->device[i].period		= info->ifcfg.asyncperiod / 4;
+		info->device[i].stp		= info->scsi.async_stp;
+		info->device[i].sof		= 0;
+		info->device[i].wide_xfer	= 0;
+	}
+
+	info->rst_bus_status = 1;
+	wake_up(&info->eh_wait);
+}
+
+/**
+ * fas216_intr - handle interrupts to progress a command
+ * @info: interface to service
+ *
+ * Handle interrupts from the interface to progress a command
+ */
+irqreturn_t fas216_intr(FAS216_Info *info)
+{
+	unsigned char inst, is, stat;
+	int handled = IRQ_NONE;
+
+	fas216_checkmagic(info);
+
+	stat = fas216_readb(info, REG_STAT);
+	is = fas216_readb(info, REG_IS);
+	inst = fas216_readb(info, REG_INST);
+
+	add_debug_list(stat, is, inst, info->scsi.phase);
+
+	if (stat & STAT_INT) {
+		if (inst & INST_BUSRESET) {
+			fas216_log(info, 0, "bus reset detected");
+			fas216_bus_reset(info);
+			scsi_report_bus_reset(info->host, 0);
+		} else if (inst & INST_ILLEGALCMD) {
+			fas216_log(info, LOG_ERROR, "illegal command given\n");
+			fas216_dumpstate(info);
+			print_debug_list();
+		} else if (inst & INST_DISCONNECT)
+			fas216_disconnect_intr(info);
+		else if (inst & INST_RESELECTED)	/* reselected			*/
+			fas216_reselected_intr(info);
+		else if (inst & INST_BUSSERVICE)	/* bus service request		*/
+			fas216_busservice_intr(info, stat, is);
+		else if (inst & INST_FUNCDONE)		/* function done		*/
+			fas216_funcdone_intr(info, stat, is);
+		else
+		    	fas216_log(info, 0, "unknown interrupt received:"
+				" phase %s inst %02X is %02X stat %02X",
+				fas216_drv_phase(info), inst, is, stat);
+		handled = IRQ_HANDLED;
+	}
+	return handled;
+}
+
+static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
+{
+	int tot_msglen;
+
+	/* following what the ESP driver says */
+	fas216_set_stc(info, 0);
+	fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
+
+	/* flush FIFO */
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	/* load bus-id and timeout */
+	fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
+	fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
+
+	/* synchronous transfers */
+	fas216_set_sync(info, SCpnt->device->id);
+
+	tot_msglen = msgqueue_msglength(&info->scsi.msgs);
+
+#ifdef DEBUG_MESSAGES
+	{
+		struct message *msg;
+		int msgnr = 0, i;
+
+		printk("scsi%d.%c: message out: ",
+			info->host->host_no, '0' + SCpnt->device->id);
+		while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+			printk("{ ");
+			for (i = 0; i < msg->length; i++)
+				printk("%02x ", msg->msg[i]);
+			printk("} ");
+		}
+		printk("\n");
+	}
+#endif
+
+	if (tot_msglen == 1 || tot_msglen == 3) {
+		/*
+		 * We have an easy message length to send...
+		 */
+		struct message *msg;
+		int msgnr = 0, i;
+
+		info->scsi.phase = PHASE_SELSTEPS;
+
+		/* load message bytes */
+		while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+			for (i = 0; i < msg->length; i++)
+				fas216_writeb(info, REG_FF, msg->msg[i]);
+			msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
+		}
+
+		/* load command */
+		for (i = 0; i < SCpnt->cmd_len; i++)
+			fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
+
+		if (tot_msglen == 1)
+			fas216_cmd(info, CMD_SELECTATN);
+		else
+			fas216_cmd(info, CMD_SELECTATN3);
+	} else {
+		/*
+		 * We have an unusual number of message bytes to send.
+		 *  Load first byte into fifo, and issue SELECT with ATN and
+		 *  stop steps.
+		 */
+		struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
+
+		fas216_writeb(info, REG_FF, msg->msg[0]);
+		msg->fifo = 1;
+
+		fas216_cmd(info, CMD_SELECTATNSTOP);
+	}
+}
+
+/*
+ * Decide whether we need to perform a parity test on this device.
+ * Can also be used to force parity error conditions during initial
+ * information transfer phase (message out) for test purposes.
+ */
+static int parity_test(FAS216_Info *info, int target)
+{
+#if 0
+	if (target == 3) {
+		info->device[target].parity_check = 0;
+		return 1;
+	}
+#endif
+	return info->device[target].parity_check;
+}
+
+static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
+{
+	int disconnect_ok;
+
+	/*
+	 * claim host busy
+	 */
+	info->scsi.phase = PHASE_SELECTION;
+	info->scsi.SCp = SCpnt->SCp;
+	info->SCpnt = SCpnt;
+	info->dma.transfer_type = fasdma_none;
+
+	if (parity_test(info, SCpnt->device->id))
+		fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
+	else
+		fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+
+	/*
+	 * Don't allow request sense commands to disconnect.
+	 */
+	disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
+			info->device[SCpnt->device->id].disconnect_ok;
+
+	/*
+	 * build outgoing message bytes
+	 */
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
+
+	/*
+	 * add tag message if required
+	 */
+	if (SCpnt->tag)
+		msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
+
+	do {
+#ifdef SCSI2_SYNC
+		if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
+		     info->device[SCpnt->device->id].sync_state == neg_complete) &&
+		    (SCpnt->cmnd[0] == REQUEST_SENSE ||
+		     SCpnt->cmnd[0] == INQUIRY)) {
+			info->device[SCpnt->device->id].sync_state = neg_inprogress;
+			msgqueue_addmsg(&info->scsi.msgs, 5,
+					EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
+					1000 / info->ifcfg.clockrate,
+					info->ifcfg.sync_max_depth);
+			break;
+		}
+#endif
+	} while (0);
+
+	__fas216_start_command(info, SCpnt);
+}
+
+static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
+{
+#ifdef SCSI2_TAG
+	/*
+	 * tagged queuing - allocate a new tag to this command
+	 */
+	if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
+	    SCpnt->cmnd[0] != INQUIRY) {
+	    SCpnt->device->current_tag += 1;
+		if (SCpnt->device->current_tag == 0)
+		    SCpnt->device->current_tag = 1;
+			SCpnt->tag = SCpnt->device->current_tag;
+	} else
+#endif
+		set_bit(SCpnt->device->id * 8 +
+			(u8)(SCpnt->device->lun & 0x7), info->busyluns);
+
+	info->stats.removes += 1;
+	switch (SCpnt->cmnd[0]) {
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_12:
+		info->stats.writes += 1;
+		break;
+	case READ_6:
+	case READ_10:
+	case READ_12:
+		info->stats.reads += 1;
+		break;
+	default:
+		info->stats.miscs += 1;
+		break;
+	}
+}
+
+static void fas216_do_bus_device_reset(FAS216_Info *info,
+				       struct scsi_cmnd *SCpnt)
+{
+	struct message *msg;
+
+	/*
+	 * claim host busy
+	 */
+	info->scsi.phase = PHASE_SELECTION;
+	info->scsi.SCp = SCpnt->SCp;
+	info->SCpnt = SCpnt;
+	info->dma.transfer_type = fasdma_none;
+
+	fas216_log(info, LOG_ERROR, "sending bus device reset");
+
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
+
+	/* following what the ESP driver says */
+	fas216_set_stc(info, 0);
+	fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
+
+	/* flush FIFO */
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	/* load bus-id and timeout */
+	fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
+	fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
+
+	/* synchronous transfers */
+	fas216_set_sync(info, SCpnt->device->id);
+
+	msg = msgqueue_getmsg(&info->scsi.msgs, 0);
+
+	fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
+	msg->fifo = 1;
+
+	fas216_cmd(info, CMD_SELECTATNSTOP);
+}
+
+/**
+ * fas216_kick - kick a command to the interface
+ * @info: our host interface to kick
+ *
+ * Kick a command to the interface, interface should be idle.
+ * Notes: Interrupts are always disabled!
+ */
+static void fas216_kick(FAS216_Info *info)
+{
+	struct scsi_cmnd *SCpnt = NULL;
+#define TYPE_OTHER	0
+#define TYPE_RESET	1
+#define TYPE_QUEUE	2
+	int where_from = TYPE_OTHER;
+
+	fas216_checkmagic(info);
+
+	/*
+	 * Obtain the next command to process.
+	 */
+	do {
+		if (info->rstSCpnt) {
+			SCpnt = info->rstSCpnt;
+			/* don't remove it */
+			where_from = TYPE_RESET;
+			break;
+		}
+
+		if (info->reqSCpnt) {
+			SCpnt = info->reqSCpnt;
+			info->reqSCpnt = NULL;
+			break;
+		}
+
+		if (info->origSCpnt) {
+			SCpnt = info->origSCpnt;
+			info->origSCpnt = NULL;
+			break;
+		}
+
+		/* retrieve next command */
+		if (!SCpnt) {
+			SCpnt = queue_remove_exclude(&info->queues.issue,
+						     info->busyluns);
+			where_from = TYPE_QUEUE;
+			break;
+		}
+	} while (0);
+
+	if (!SCpnt) {
+		/*
+		 * no command pending, so enable reselection.
+		 */
+		fas216_cmd(info, CMD_ENABLESEL);
+		return;
+	}
+
+	/*
+	 * We're going to start a command, so disable reselection
+	 */
+	fas216_cmd(info, CMD_DISABLESEL);
+
+	if (info->scsi.disconnectable && info->SCpnt) {
+		fas216_log(info, LOG_CONNECT,
+			"moved command for %d to disconnected queue",
+			info->SCpnt->device->id);
+		queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
+		info->scsi.disconnectable = 0;
+		info->SCpnt = NULL;
+	}
+
+	fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
+			   "starting");
+
+	switch (where_from) {
+	case TYPE_QUEUE:
+		fas216_allocate_tag(info, SCpnt);
+	case TYPE_OTHER:
+		fas216_start_command(info, SCpnt);
+		break;
+	case TYPE_RESET:
+		fas216_do_bus_device_reset(info, SCpnt);
+		break;
+	}
+
+	fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
+		info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+
+	/*
+	 * should now get either DISCONNECT or
+	 * (FUNCTION DONE with BUS SERVICE) interrupt
+	 */
+}
+
+/*
+ * Clean up from issuing a BUS DEVICE RESET message to a device.
+ */
+static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
+				    unsigned int result)
+{
+	fas216_log(info, LOG_ERROR, "fas216 device reset complete");
+
+	info->rstSCpnt = NULL;
+	info->rst_dev_status = 1;
+	wake_up(&info->eh_wait);
+}
+
+/**
+ * fas216_rq_sns_done - Finish processing automatic request sense command
+ * @info: interface that completed
+ * @SCpnt: command that completed
+ * @result: driver byte of result
+ *
+ * Finish processing automatic request sense command
+ */
+static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
+			       unsigned int result)
+{
+	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
+		   "request sense complete, result=0x%04x%02x%02x",
+		   result, SCpnt->SCp.Message, SCpnt->SCp.Status);
+
+	if (result != DID_OK || SCpnt->SCp.Status != GOOD)
+		/*
+		 * Something went wrong.  Make sure that we don't
+		 * have valid data in the sense buffer that could
+		 * confuse the higher levels.
+		 */
+		memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
+//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
+//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
+	/*
+	 * Note that we don't set SCpnt->result, since that should
+	 * reflect the status of the command that we were asked by
+	 * the upper layers to process.  This would have been set
+	 * correctly by fas216_std_done.
+	 */
+	scsi_eh_restore_cmnd(SCpnt, &info->ses);
+	SCpnt->scsi_done(SCpnt);
+}
+
+/**
+ * fas216_std_done - finish processing of standard command
+ * @info: interface that completed
+ * @SCpnt: command that completed
+ * @result: driver byte of result
+ *
+ * Finish processing of standard command
+ */
+static void
+fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
+{
+	info->stats.fins += 1;
+
+	SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
+			info->scsi.SCp.Status;
+
+	fas216_log_command(info, LOG_CONNECT, SCpnt,
+		"command complete, result=0x%08x", SCpnt->result);
+
+	/*
+	 * If the driver detected an error, we're all done.
+	 */
+	if (host_byte(SCpnt->result) != DID_OK ||
+	    msg_byte(SCpnt->result) != COMMAND_COMPLETE)
+		goto done;
+
+	/*
+	 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
+	 * status, request the sense information.
+	 */
+	if (status_byte(SCpnt->result) == CHECK_CONDITION ||
+	    status_byte(SCpnt->result) == COMMAND_TERMINATED)
+		goto request_sense;
+
+	/*
+	 * If the command did not complete with GOOD status,
+	 * we are all done here.
+	 */
+	if (status_byte(SCpnt->result) != GOOD)
+		goto done;
+
+	/*
+	 * We have successfully completed a command.  Make sure that
+	 * we do not have any buffers left to transfer.  The world
+	 * is not perfect, and we seem to occasionally hit this.
+	 * It can be indicative of a buggy driver, target or the upper
+	 * levels of the SCSI code.
+	 */
+	if (info->scsi.SCp.ptr) {
+		switch (SCpnt->cmnd[0]) {
+		case INQUIRY:
+		case START_STOP:
+		case MODE_SENSE:
+			break;
+
+		default:
+			scmd_printk(KERN_ERR, SCpnt,
+				    "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
+				    SCpnt->result, info->scsi.SCp.ptr,
+				    info->scsi.SCp.this_residual);
+			scsi_print_command(SCpnt);
+			set_host_byte(SCpnt, DID_ERROR);
+			goto request_sense;
+		}
+	}
+
+done:
+	if (SCpnt->scsi_done) {
+		SCpnt->scsi_done(SCpnt);
+		return;
+	}
+
+	panic("scsi%d.H: null scsi_done function in fas216_done",
+		info->host->host_no);
+
+
+request_sense:
+	if (SCpnt->cmnd[0] == REQUEST_SENSE)
+		goto done;
+
+	scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
+	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
+			  "requesting sense");
+	init_SCp(SCpnt);
+	SCpnt->SCp.Message = 0;
+	SCpnt->SCp.Status = 0;
+	SCpnt->tag = 0;
+	SCpnt->host_scribble = (void *)fas216_rq_sns_done;
+
+	/*
+	 * Place this command into the high priority "request
+	 * sense" slot.  This will be the very next command
+	 * executed, unless a target connects to us.
+	 */
+	if (info->reqSCpnt)
+		printk(KERN_WARNING "scsi%d.%c: losing request command\n",
+			info->host->host_no, '0' + SCpnt->device->id);
+	info->reqSCpnt = SCpnt;
+}
+
+/**
+ * fas216_done - complete processing for current command
+ * @info: interface that completed
+ * @result: driver byte of result
+ *
+ * Complete processing for current command
+ */
+static void fas216_done(FAS216_Info *info, unsigned int result)
+{
+	void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
+	struct scsi_cmnd *SCpnt;
+	unsigned long flags;
+
+	fas216_checkmagic(info);
+
+	if (!info->SCpnt)
+		goto no_command;
+
+	SCpnt = info->SCpnt;
+	info->SCpnt = NULL;
+    	info->scsi.phase = PHASE_IDLE;
+
+	if (info->scsi.aborting) {
+		fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
+		result = DID_ABORT;
+		info->scsi.aborting = 0;
+	}
+
+	/*
+	 * Sanity check the completion - if we have zero bytes left
+	 * to transfer, we should not have a valid pointer.
+	 */
+	if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
+		scmd_printk(KERN_INFO, SCpnt,
+			    "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
+			    info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		info->scsi.SCp.ptr = NULL;
+		scsi_print_command(SCpnt);
+	}
+
+	/*
+	 * Clear down this command as completed.  If we need to request
+	 * the sense information, fas216_kick will re-assert the busy
+	 * status.
+	 */
+	info->device[SCpnt->device->id].parity_check = 0;
+	clear_bit(SCpnt->device->id * 8 +
+		  (u8)(SCpnt->device->lun & 0x7), info->busyluns);
+
+	fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
+	fn(info, SCpnt, result);
+
+	if (info->scsi.irq) {
+		spin_lock_irqsave(&info->host_lock, flags);
+		if (info->scsi.phase == PHASE_IDLE)
+			fas216_kick(info);
+		spin_unlock_irqrestore(&info->host_lock, flags);
+	}
+	return;
+
+no_command:
+	panic("scsi%d.H: null command in fas216_done",
+		info->host->host_no);
+}
+
+/**
+ * fas216_queue_command - queue a command for adapter to process.
+ * @SCpnt: Command to queue
+ * @done: done function to call once command is complete
+ *
+ * Queue a command for adapter to process.
+ * Returns: 0 on success, else error.
+ * Notes: io_request_lock is held, interrupts are disabled.
+ */
+static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
+			 void (*done)(struct scsi_cmnd *))
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	int result;
+
+	fas216_checkmagic(info);
+
+	fas216_log_command(info, LOG_CONNECT, SCpnt,
+			   "received command (%p)", SCpnt);
+
+	SCpnt->scsi_done = done;
+	SCpnt->host_scribble = (void *)fas216_std_done;
+	SCpnt->result = 0;
+
+	init_SCp(SCpnt);
+
+	info->stats.queues += 1;
+	SCpnt->tag = 0;
+
+	spin_lock(&info->host_lock);
+
+	/*
+	 * Add command into execute queue and let it complete under
+	 * whatever scheme we're using.
+	 */
+	result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
+
+	/*
+	 * If we successfully added the command,
+	 * kick the interface to get it moving.
+	 */
+	if (result == 0 && info->scsi.phase == PHASE_IDLE)
+		fas216_kick(info);
+	spin_unlock(&info->host_lock);
+
+	fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
+		result ? "failure" : "success");
+
+	return result;
+}
+
+DEF_SCSI_QCMD(fas216_queue_command)
+
+/**
+ * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
+ * @SCpnt: Command to wake
+ *
+ * Trigger restart of a waiting thread in fas216_command
+ */
+static void fas216_internal_done(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+
+	fas216_checkmagic(info);
+
+	info->internal_done = 1;
+}
+
+/**
+ * fas216_noqueue_command - process a command for the adapter.
+ * @SCpnt: Command to queue
+ *
+ * Queue a command for adapter to process.
+ * Returns: scsi result code.
+ * Notes: io_request_lock is held, interrupts are disabled.
+ */
+static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
+			   void (*done)(struct scsi_cmnd *))
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+
+	fas216_checkmagic(info);
+
+	/*
+	 * We should only be using this if we don't have an interrupt.
+	 * Provide some "incentive" to use the queueing code.
+	 */
+	BUG_ON(info->scsi.irq);
+
+	info->internal_done = 0;
+	fas216_queue_command_lck(SCpnt, fas216_internal_done);
+
+	/*
+	 * This wastes time, since we can't return until the command is
+	 * complete. We can't sleep either since we may get re-entered!
+	 * However, we must re-enable interrupts, or else we'll be
+	 * waiting forever.
+	 */
+	spin_unlock_irq(info->host->host_lock);
+
+	while (!info->internal_done) {
+		/*
+		 * If we don't have an IRQ, then we must poll the card for
+		 * it's interrupt, and use that to call this driver's
+		 * interrupt routine.  That way, we keep the command
+		 * progressing.  Maybe we can add some intelligence here
+		 * and go to sleep if we know that the device is going
+		 * to be some time (eg, disconnected).
+		 */
+		if (fas216_readb(info, REG_STAT) & STAT_INT) {
+			spin_lock_irq(info->host->host_lock);
+			fas216_intr(info);
+			spin_unlock_irq(info->host->host_lock);
+		}
+	}
+
+	spin_lock_irq(info->host->host_lock);
+
+	done(SCpnt);
+
+	return 0;
+}
+
+DEF_SCSI_QCMD(fas216_noqueue_command)
+
+/*
+ * Error handler timeout function.  Indicate that we timed out,
+ * and wake up any error handler process so it can continue.
+ */
+static void fas216_eh_timer(unsigned long data)
+{
+	FAS216_Info *info = (FAS216_Info *)data;
+
+	fas216_log(info, LOG_ERROR, "error handling timed out\n");
+
+	del_timer(&info->eh_timer);
+
+	if (info->rst_bus_status == 0)
+		info->rst_bus_status = -1;
+	if (info->rst_dev_status == 0)
+		info->rst_dev_status = -1;
+
+	wake_up(&info->eh_wait);
+}
+
+enum res_find {
+	res_failed,		/* not found			*/
+	res_success,		/* command on issue queue	*/
+	res_hw_abort		/* command on disconnected dev	*/
+};
+
+/**
+ * fas216_do_abort - decide how to abort a command
+ * @SCpnt: command to abort
+ *
+ * Decide how to abort a command.
+ * Returns: abort status
+ */
+static enum res_find fas216_find_command(FAS216_Info *info,
+					 struct scsi_cmnd *SCpnt)
+{
+	enum res_find res = res_failed;
+
+	if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
+		/*
+		 * The command was on the issue queue, and has not been
+		 * issued yet.  We can remove the command from the queue,
+		 * and acknowledge the abort.  Neither the device nor the
+		 * interface know about the command.
+		 */
+		printk("on issue queue ");
+
+		res = res_success;
+	} else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
+		/*
+		 * The command was on the disconnected queue.  We must
+		 * reconnect with the device if possible, and send it
+		 * an abort message.
+		 */
+		printk("on disconnected queue ");
+
+		res = res_hw_abort;
+	} else if (info->SCpnt == SCpnt) {
+		printk("executing ");
+
+		switch (info->scsi.phase) {
+		/*
+		 * If the interface is idle, and the command is 'disconnectable',
+		 * then it is the same as on the disconnected queue.
+		 */
+		case PHASE_IDLE:
+			if (info->scsi.disconnectable) {
+				info->scsi.disconnectable = 0;
+				info->SCpnt = NULL;
+				res = res_hw_abort;
+			}
+			break;
+
+		default:
+			break;
+		}
+	} else if (info->origSCpnt == SCpnt) {
+		/*
+		 * The command will be executed next, but a command
+		 * is currently using the interface.  This is similar to
+		 * being on the issue queue, except the busylun bit has
+		 * been set.
+		 */
+		info->origSCpnt = NULL;
+		clear_bit(SCpnt->device->id * 8 +
+			  (u8)(SCpnt->device->lun & 0x7), info->busyluns);
+		printk("waiting for execution ");
+		res = res_success;
+	} else
+		printk("unknown ");
+
+	return res;
+}
+
+/**
+ * fas216_eh_abort - abort this command
+ * @SCpnt: command to abort
+ *
+ * Abort this command.
+ * Returns: FAILED if unable to abort
+ * Notes: io_request_lock is taken, and irqs are disabled
+ */
+int fas216_eh_abort(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	int result = FAILED;
+
+	fas216_checkmagic(info);
+
+	info->stats.aborts += 1;
+
+	scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
+
+	print_debug_list();
+	fas216_dumpstate(info);
+
+	switch (fas216_find_command(info, SCpnt)) {
+	/*
+	 * We found the command, and cleared it out.  Either
+	 * the command is still known to be executing on the
+	 * target, or the busylun bit is not set.
+	 */
+	case res_success:
+		scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
+		result = SUCCESS;
+		break;
+
+	/*
+	 * We need to reconnect to the target and send it an
+	 * ABORT or ABORT_TAG message.  We can only do this
+	 * if the bus is free.
+	 */
+	case res_hw_abort:
+
+	/*
+	 * We are unable to abort the command for some reason.
+	 */
+	default:
+	case res_failed:
+		scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
+		break;
+	}
+
+	return result;
+}
+
+/**
+ * fas216_eh_device_reset - Reset the device associated with this command
+ * @SCpnt: command specifing device to reset
+ *
+ * Reset the device associated with this command.
+ * Returns: FAILED if unable to reset.
+ * Notes: We won't be re-entered, so we'll only have one device
+ * reset on the go at one time.
+ */
+int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	unsigned long flags;
+	int i, res = FAILED, target = SCpnt->device->id;
+
+	fas216_log(info, LOG_ERROR, "device reset for target %d", target);
+
+	spin_lock_irqsave(&info->host_lock, flags);
+
+	do {
+		/*
+		 * If we are currently connected to a device, and
+		 * it is the device we want to reset, there is
+		 * nothing we can do here.  Chances are it is stuck,
+		 * and we need a bus reset.
+		 */
+		if (info->SCpnt && !info->scsi.disconnectable &&
+		    info->SCpnt->device->id == SCpnt->device->id)
+			break;
+
+		/*
+		 * We're going to be resetting this device.  Remove
+		 * all pending commands from the driver.  By doing
+		 * so, we guarantee that we won't touch the command
+		 * structures except to process the reset request.
+		 */
+		queue_remove_all_target(&info->queues.issue, target);
+		queue_remove_all_target(&info->queues.disconnected, target);
+		if (info->origSCpnt && info->origSCpnt->device->id == target)
+			info->origSCpnt = NULL;
+		if (info->reqSCpnt && info->reqSCpnt->device->id == target)
+			info->reqSCpnt = NULL;
+		for (i = 0; i < 8; i++)
+			clear_bit(target * 8 + i, info->busyluns);
+
+		/*
+		 * Hijack this SCSI command structure to send
+		 * a bus device reset message to this device.
+		 */
+		SCpnt->host_scribble = (void *)fas216_devicereset_done;
+
+		info->rst_dev_status = 0;
+		info->rstSCpnt = SCpnt;
+
+		if (info->scsi.phase == PHASE_IDLE)
+			fas216_kick(info);
+
+		mod_timer(&info->eh_timer, jiffies + 30 * HZ);
+		spin_unlock_irqrestore(&info->host_lock, flags);
+
+		/*
+		 * Wait up to 30 seconds for the reset to complete.
+		 */
+		wait_event(info->eh_wait, info->rst_dev_status);
+
+		del_timer_sync(&info->eh_timer);
+		spin_lock_irqsave(&info->host_lock, flags);
+		info->rstSCpnt = NULL;
+
+		if (info->rst_dev_status == 1)
+			res = SUCCESS;
+	} while (0);
+
+	SCpnt->host_scribble = NULL;
+	spin_unlock_irqrestore(&info->host_lock, flags);
+
+	fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
+		   res == SUCCESS ? "success" : "failed");
+
+	return res;
+}
+
+/**
+ * fas216_eh_bus_reset - Reset the bus associated with the command
+ * @SCpnt: command specifing bus to reset
+ *
+ * Reset the bus associated with the command.
+ * Returns: FAILED if unable to reset.
+ * Notes: Further commands are blocked.
+ */
+int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	unsigned long flags;
+	struct scsi_device *SDpnt;
+
+	fas216_checkmagic(info);
+	fas216_log(info, LOG_ERROR, "resetting bus");
+
+	info->stats.bus_resets += 1;
+
+	spin_lock_irqsave(&info->host_lock, flags);
+
+	/*
+	 * Stop all activity on this interface.
+	 */
+	fas216_aborttransfer(info);
+	fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
+
+	/*
+	 * Clear any pending interrupts.
+	 */
+	while (fas216_readb(info, REG_STAT) & STAT_INT)
+		fas216_readb(info, REG_INST);
+
+	info->rst_bus_status = 0;
+
+	/*
+	 * For each attached hard-reset device, clear out
+	 * all command structures.  Leave the running
+	 * command in place.
+	 */
+	shost_for_each_device(SDpnt, info->host) {
+		int i;
+
+		if (SDpnt->soft_reset)
+			continue;
+
+		queue_remove_all_target(&info->queues.issue, SDpnt->id);
+		queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
+		if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
+			info->origSCpnt = NULL;
+		if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
+			info->reqSCpnt = NULL;
+		info->SCpnt = NULL;
+
+		for (i = 0; i < 8; i++)
+			clear_bit(SDpnt->id * 8 + i, info->busyluns);
+	}
+
+	info->scsi.phase = PHASE_IDLE;
+
+	/*
+	 * Reset the SCSI bus.  Device cleanup happens in
+	 * the interrupt handler.
+	 */
+	fas216_cmd(info, CMD_RESETSCSI);
+
+	mod_timer(&info->eh_timer, jiffies + HZ);
+	spin_unlock_irqrestore(&info->host_lock, flags);
+
+	/*
+	 * Wait one second for the interrupt.
+	 */
+	wait_event(info->eh_wait, info->rst_bus_status);
+	del_timer_sync(&info->eh_timer);
+
+	fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
+		   info->rst_bus_status == 1 ? "success" : "failed");
+
+	return info->rst_bus_status == 1 ? SUCCESS : FAILED;
+}
+
+/**
+ * fas216_init_chip - Initialise FAS216 state after reset
+ * @info: state structure for interface
+ *
+ * Initialise FAS216 state after reset
+ */
+static void fas216_init_chip(FAS216_Info *info)
+{
+	unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
+	fas216_writeb(info, REG_CLKF, clock);
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+	fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
+	fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
+	fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
+	fas216_writeb(info, REG_SOF, 0);
+	fas216_writeb(info, REG_STP, info->scsi.async_stp);
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+}
+
+/**
+ * fas216_eh_host_reset - Reset the host associated with this command
+ * @SCpnt: command specifing host to reset
+ *
+ * Reset the host associated with this command.
+ * Returns: FAILED if unable to reset.
+ * Notes: io_request_lock is taken, and irqs are disabled
+ */
+int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+
+	spin_lock_irq(info->host->host_lock);
+
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_ERROR, "resetting host");
+
+	/*
+	 * Reset the SCSI chip.
+	 */
+	fas216_cmd(info, CMD_RESETCHIP);
+
+	/*
+	 * Ugly ugly ugly!
+	 * We need to release the host_lock and enable
+	 * IRQs if we sleep, but we must relock and disable
+	 * IRQs after the sleep.
+	 */
+	spin_unlock_irq(info->host->host_lock);
+	msleep(50 * 1000/100);
+	spin_lock_irq(info->host->host_lock);
+
+	/*
+	 * Release the SCSI reset.
+	 */
+	fas216_cmd(info, CMD_NOP);
+
+	fas216_init_chip(info);
+
+	spin_unlock_irq(info->host->host_lock);
+	return SUCCESS;
+}
+
+#define TYPE_UNKNOWN	0
+#define TYPE_NCR53C90	1
+#define TYPE_NCR53C90A	2
+#define TYPE_NCR53C9x	3
+#define TYPE_Am53CF94	4
+#define TYPE_EmFAS216	5
+#define TYPE_QLFAS216	6
+
+static char *chip_types[] = {
+	"unknown",
+	"NS NCR53C90",
+	"NS NCR53C90A",
+	"NS NCR53C9x",
+	"AMD Am53CF94",
+	"Emulex FAS216",
+	"QLogic FAS216"
+};
+
+static int fas216_detect_type(FAS216_Info *info)
+{
+	int family, rev;
+
+	/*
+	 * Reset the chip.
+	 */
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	udelay(50);
+	fas216_writeb(info, REG_CMD, CMD_NOP);
+
+	/*
+	 * Check to see if control reg 2 is present.
+	 */
+	fas216_writeb(info, REG_CNTL3, 0);
+	fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
+
+	/*
+	 * If we are unable to read back control reg 2
+	 * correctly, it is not present, and we have a
+	 * NCR53C90.
+	 */
+	if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
+		return TYPE_NCR53C90;
+
+	/*
+	 * Now, check control register 3
+	 */
+	fas216_writeb(info, REG_CNTL2, 0);
+	fas216_writeb(info, REG_CNTL3, 0);
+	fas216_writeb(info, REG_CNTL3, 5);
+
+	/*
+	 * If we are unable to read the register back
+	 * correctly, we have a NCR53C90A
+	 */
+	if (fas216_readb(info, REG_CNTL3) != 5)
+		return TYPE_NCR53C90A;
+
+	/*
+	 * Now read the ID from the chip.
+	 */
+	fas216_writeb(info, REG_CNTL3, 0);
+
+	fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
+	fas216_writeb(info, REG_CNTL3, 0);
+
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	udelay(50);
+	fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
+
+	fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	udelay(50);
+	fas216_writeb(info, REG_CMD, CMD_NOP);
+
+	rev     = fas216_readb(info, REG_ID);
+	family  = rev >> 3;
+	rev    &= 7;
+
+	switch (family) {
+	case 0x01:
+		if (rev == 4)
+			return TYPE_Am53CF94;
+		break;
+
+	case 0x02:
+		switch (rev) {
+		case 2:
+			return TYPE_EmFAS216;
+		case 3:
+			return TYPE_QLFAS216;
+		}
+		break;
+
+	default:
+		break;
+	}
+	printk("family %x rev %x\n", family, rev);
+	return TYPE_NCR53C9x;
+}
+
+/**
+ * fas216_reset_state - Initialise driver internal state
+ * @info: state to initialise
+ *
+ * Initialise driver internal state
+ */
+static void fas216_reset_state(FAS216_Info *info)
+{
+	int i;
+
+	fas216_checkmagic(info);
+
+	fas216_bus_reset(info);
+
+	/*
+	 * Clear out all stale info in our state structure
+	 */
+	memset(info->busyluns, 0, sizeof(info->busyluns));
+	info->scsi.disconnectable = 0;
+	info->scsi.aborting = 0;
+
+	for (i = 0; i < 8; i++) {
+		info->device[i].parity_enabled	= 0;
+		info->device[i].parity_check	= 1;
+	}
+
+	/*
+	 * Drain all commands on disconnected queue
+	 */
+	while (queue_remove(&info->queues.disconnected) != NULL);
+
+	/*
+	 * Remove executing commands.
+	 */
+	info->SCpnt     = NULL;
+	info->reqSCpnt  = NULL;
+	info->rstSCpnt  = NULL;
+	info->origSCpnt = NULL;
+}
+
+/**
+ * fas216_init - initialise FAS/NCR/AMD SCSI structures.
+ * @host: a driver-specific filled-out structure
+ *
+ * Initialise FAS/NCR/AMD SCSI structures.
+ * Returns: 0 on success
+ */
+int fas216_init(struct Scsi_Host *host)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+
+	info->magic_start    = MAGIC;
+	info->magic_end      = MAGIC;
+	info->host           = host;
+	info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
+	info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
+	info->scsi.cfg[2]    = info->ifcfg.cntl3 |
+			       CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
+	info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
+
+	info->rst_dev_status = -1;
+	info->rst_bus_status = -1;
+	init_waitqueue_head(&info->eh_wait);
+	init_timer(&info->eh_timer);
+	info->eh_timer.data  = (unsigned long)info;
+	info->eh_timer.function = fas216_eh_timer;
+	
+	spin_lock_init(&info->host_lock);
+
+	memset(&info->stats, 0, sizeof(info->stats));
+
+	msgqueue_initialise(&info->scsi.msgs);
+
+	if (!queue_initialise(&info->queues.issue))
+		return -ENOMEM;
+
+	if (!queue_initialise(&info->queues.disconnected)) {
+		queue_free(&info->queues.issue);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/**
+ * fas216_add - initialise FAS/NCR/AMD SCSI ic.
+ * @host: a driver-specific filled-out structure
+ * @dev: parent device
+ *
+ * Initialise FAS/NCR/AMD SCSI ic.
+ * Returns: 0 on success
+ */
+int fas216_add(struct Scsi_Host *host, struct device *dev)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+	int type, ret;
+
+	if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
+		printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
+			info->ifcfg.clockrate);
+		return -EINVAL;
+	}
+
+	fas216_reset_state(info);
+	type = fas216_detect_type(info);
+	info->scsi.type = chip_types[type];
+
+	udelay(300);
+
+	/*
+	 * Initialise the chip correctly.
+	 */
+	fas216_init_chip(info);
+
+	/*
+	 * Reset the SCSI bus.  We don't want to see
+	 * the resulting reset interrupt, so mask it
+	 * out.
+	 */
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
+	fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
+
+	/*
+	 * scsi standard says wait 250ms
+	 */
+	spin_unlock_irq(info->host->host_lock);
+	msleep(100*1000/100);
+	spin_lock_irq(info->host->host_lock);
+
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+	fas216_readb(info, REG_INST);
+
+	fas216_checkmagic(info);
+
+	ret = scsi_add_host(host, dev);
+	if (ret)
+		fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	else
+		scsi_scan_host(host);
+
+	return ret;
+}
+
+void fas216_remove(struct Scsi_Host *host)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+
+	fas216_checkmagic(info);
+	scsi_remove_host(host);
+
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	scsi_host_put(host);
+}
+
+/**
+ * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
+ * @host: a driver-specific filled-out structure
+ *
+ * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
+ */
+void fas216_release(struct Scsi_Host *host)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+
+	queue_free(&info->queues.disconnected);
+	queue_free(&info->queues.issue);
+}
+
+void fas216_print_host(FAS216_Info *info, struct seq_file *m)
+{
+	seq_printf(m,
+			"\n"
+			"Chip    : %s\n"
+			" Address: 0x%p\n"
+			" IRQ    : %d\n"
+			" DMA    : %d\n",
+			info->scsi.type, info->scsi.io_base,
+			info->scsi.irq, info->scsi.dma);
+}
+
+void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
+{
+	seq_printf(m, "\n"
+			"Command Statistics:\n"
+			" Queued     : %u\n"
+			" Issued     : %u\n"
+			" Completed  : %u\n"
+			" Reads      : %u\n"
+			" Writes     : %u\n"
+			" Others     : %u\n"
+			" Disconnects: %u\n"
+			" Aborts     : %u\n"
+			" Bus resets : %u\n"
+			" Host resets: %u\n",
+			info->stats.queues,	 info->stats.removes,
+			info->stats.fins,	 info->stats.reads,
+			info->stats.writes,	 info->stats.miscs,
+			info->stats.disconnects, info->stats.aborts,
+			info->stats.bus_resets,	 info->stats.host_resets);
+}
+
+void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
+{
+	struct fas216_device *dev;
+	struct scsi_device *scd;
+
+	seq_puts(m, "Device/Lun TaggedQ       Parity   Sync\n");
+
+	shost_for_each_device(scd, info->host) {
+		dev = &info->device[scd->id];
+		seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
+		if (scd->tagged_supported)
+			seq_printf(m, "%3sabled(%3d) ",
+				     scd->simple_tags ? "en" : "dis",
+				     scd->current_tag);
+		else
+			seq_puts(m, "unsupported   ");
+
+		seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
+
+		if (dev->sof)
+			seq_printf(m, "offset %d, %d ns\n",
+				     dev->sof, dev->period * 4);
+		else
+			seq_puts(m, "async\n");
+	}
+}
+
+EXPORT_SYMBOL(fas216_init);
+EXPORT_SYMBOL(fas216_add);
+EXPORT_SYMBOL(fas216_queue_command);
+EXPORT_SYMBOL(fas216_noqueue_command);
+EXPORT_SYMBOL(fas216_intr);
+EXPORT_SYMBOL(fas216_remove);
+EXPORT_SYMBOL(fas216_release);
+EXPORT_SYMBOL(fas216_eh_abort);
+EXPORT_SYMBOL(fas216_eh_device_reset);
+EXPORT_SYMBOL(fas216_eh_bus_reset);
+EXPORT_SYMBOL(fas216_eh_host_reset);
+EXPORT_SYMBOL(fas216_print_host);
+EXPORT_SYMBOL(fas216_print_stats);
+EXPORT_SYMBOL(fas216_print_devices);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
+MODULE_LICENSE("GPL");