/*
   *  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
  ",
  		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=
  ");
  	printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p
  ",
  		info->magic_start, info->host, info->SCpnt,
  		info->origSCpnt);
  	printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }
  ",
  		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
  ",
  		info->scsi.type, info->scsi.phase);
  	print_SCp(&info->scsi.SCp, "           SCp={ ", " }
  ");
  	printk("      msgs async_stp=%X disconnectable=%d aborting=%d }
  ",
  		info->scsi.async_stp,
  		info->scsi.disconnectable, info->scsi.aborting);
  	printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X
  "
  	       "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}
  ",
  		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 }
  ",
  		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 }
  ",
  			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 }
  ",
  		info->dma.transfer_type, info->dma.setup,
  		info->dma.pseudo, info->dma.stop);
  	printk("    internal_done=%X magic_end=%lX }
  ",
  		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
  ");
  		corruption++;
  	}
  	if (info->magic_end != MAGIC) {
  		printk(KERN_CRIT "FAS216 Error: magic at end corrupted
  ");
  		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);
  
  	printk(" CDB: ");
  	__scsi_print_command(SCpnt->cmnd);
  }
  
  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("
  ");
  }
  
  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("
  ");
  }
  
  #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
  ");
  	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("
  ");
  	} while (i != ph_ptr);
  	if ((i ^ ph_ptr) & 7)
  		printk("
  ");
  
  	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("
  ");
  }
  
  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
  ", 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
  ",
  				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: ", "
  ");
  		print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "
  ");
  		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
  ",
  			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
  ",
  			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("
  ");
   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?
  ",
  			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 ? " " : "
    ", message[i]);
  	printk("
  ");
  
  	/*
  	 * 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("
  ");
  	}
  #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
  ",
  			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?
  ",
  			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?
  ",
  		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
  ");
  			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("
  ");
  	}
  #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 + SCpnt->device->lun, 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("
  "); }
  	/*
  	 * 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:
  			printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
  				"detected: res=%08X ptr=%p len=%X CDB: ",
  				info->host->host_no, '0' + SCpnt->device->id,
  				SCpnt->result, info->scsi.SCp.ptr,
  				info->scsi.SCp.this_residual);
  			__scsi_print_command(SCpnt->cmnd);
  			SCpnt->result &= ~(255 << 16);
  			SCpnt->result |= DID_BAD_TARGET << 16;
  			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
  ",
  			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) {
  		printk("scsi%d.%c: zero bytes left to transfer, but "
  		       "buffer pointer still valid: ptr=%p len=%08x CDB: ",
  		       info->host->host_no, '0' + SCpnt->device->id,
  		       info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
  		info->scsi.SCp.ptr = NULL;
  		__scsi_print_command(SCpnt->cmnd);
  	}
  
  	/*
  	 * 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 + SCpnt->device->lun, 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
  ");
  
  	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 + SCpnt->device->lun, 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;
  
  	printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no);
  	__scsi_print_command(SCpnt->cmnd);
  
  	print_debug_list();
  	fas216_dumpstate(info);
  
  	printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt);
  
  	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:
  		printk("success
  ");
  		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:
  		printk("failed
  ");
  		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
  ",
  		   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
  ",
  		   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);
  
  	printk("scsi%d.%c: %s: resetting host
  ",
  		info->host->host_no, '0' + SCpnt->device->id, __func__);
  
  	/*
  	 * 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
  ", 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
  ",
  			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,
  			"
  "
  			"Chip    : %s
  "
  			" Address: 0x%p
  "
  			" IRQ    : %d
  "
  			" DMA    : %d
  ",
  			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, "
  "
  			"Command Statistics:
  "
  			" Queued     : %u
  "
  			" Issued     : %u
  "
  			" Completed  : %u
  "
  			" Reads      : %u
  "
  			" Writes     : %u
  "
  			" Others     : %u
  "
  			" Disconnects: %u
  "
  			" Aborts     : %u
  "
  			" Bus resets : %u
  "
  			" Host resets: %u
  ",
  			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_printf(m, "Device/Lun TaggedQ       Parity   Sync
  ");
  
  	shost_for_each_device(scd, info->host) {
  		dev = &info->device[scd->id];
  		seq_printf(m, "     %d/%d   ", scd->id, scd->lun);
  		if (scd->tagged_supported)
  			seq_printf(m, "%3sabled(%3d) ",
  				     scd->simple_tags ? "en" : "dis",
  				     scd->current_tag);
  		else
  			seq_printf(m, "unsupported   ");
  
  		seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
  
  		if (dev->sof)
  			seq_printf(m, "offset %d, %d ns
  ",
  				     dev->sof, dev->period * 4);
  		else
  			seq_printf(m, "async
  ");
  	}
  }
  
  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");