Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2147 insertions, 0 deletions

diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
new file mode 100644
index 000000000..e4fafc77b
--- /dev/null
+++ b/drivers/scsi/wd33c93.c
@@ -0,0 +1,2147 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ *    john@geolog.com
+ *    jshiffle@netcom.com
+ */
+
+/*
+ * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC
+ * provided much of the inspiration and some of the code for this
+ * driver. Everything I know about Amiga DMA was gleaned from careful
+ * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I
+ * borrowed shamelessly from all over that source. Thanks Hamish!
+ *
+ * _This_ driver is (I feel) an improvement over the old one in
+ * several respects:
+ *
+ *    -  Target Disconnection/Reconnection  is now supported. Any
+ *          system with more than one device active on the SCSI bus
+ *          will benefit from this. The driver defaults to what I
+ *          call 'adaptive disconnect' - meaning that each command
+ *          is evaluated individually as to whether or not it should
+ *          be run with the option to disconnect/reselect (if the
+ *          device chooses), or as a "SCSI-bus-hog".
+ *
+ *    -  Synchronous data transfers are now supported. Because of
+ *          a few devices that choke after telling the driver that
+ *          they can do sync transfers, we don't automatically use
+ *          this faster protocol - it can be enabled via the command-
+ *          line on a device-by-device basis.
+ *
+ *    -  Runtime operating parameters can now be specified through
+ *       the 'amiboot' or the 'insmod' command line. For amiboot do:
+ *          "amiboot [usual stuff] wd33c93=blah,blah,blah"
+ *       The defaults should be good for most people. See the comment
+ *       for 'setup_strings' below for more details.
+ *
+ *    -  The old driver relied exclusively on what the Western Digital
+ *          docs call "Combination Level 2 Commands", which are a great
+ *          idea in that the CPU is relieved of a lot of interrupt
+ *          overhead. However, by accepting a certain (user-settable)
+ *          amount of additional interrupts, this driver achieves
+ *          better control over the SCSI bus, and data transfers are
+ *          almost as fast while being much easier to define, track,
+ *          and debug.
+ *
+ *
+ * TODO:
+ *       more speed. linked commands.
+ *
+ *
+ * People with bug reports, wish-lists, complaints, comments,
+ * or improvements are asked to pah-leeez email me (John Shifflett)
+ * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
+ * this thing into as good a shape as possible, and I'm positive
+ * there are lots of lurking bugs and "Stupid Places".
+ *
+ * Updates:
+ *
+ * Added support for pre -A chips, which don't have advanced features
+ * and will generate CSR_RESEL rather than CSR_RESEL_AM.
+ *	Richard Hirst <richard@sleepie.demon.co.uk>  August 2000
+ *
+ * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of
+ * default_sx_per for asynchronous data transfers. Added adjustment
+ * of transfer periods in sx_table to the actual input-clock.
+ *  peter fuerst <post@pfrst.de>  February 2007
+ */
+
+#include <linux/module.h>
+
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+
+#include <asm/irq.h>
+
+#include "wd33c93.h"
+
+#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns
+
+
+#define WD33C93_VERSION    "1.26++"
+#define WD33C93_DATE       "10/Feb/2007"
+
+MODULE_AUTHOR("John Shifflett");
+MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * 'setup_strings' is a single string used to pass operating parameters and
+ * settings from the kernel/module command-line to the driver. 'setup_args[]'
+ * is an array of strings that define the compile-time default values for
+ * these settings. If Linux boots with an amiboot or insmod command-line,
+ * those settings are combined with 'setup_args[]'. Note that amiboot
+ * command-lines are prefixed with "wd33c93=" while insmod uses a
+ * "setup_strings=" prefix. The driver recognizes the following keywords
+ * (lower case required) and arguments:
+ *
+ * -  nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
+ *                    the 7 possible SCSI devices. Set a bit to negotiate for
+ *                    asynchronous transfers on that device. To maintain
+ *                    backwards compatibility, a command-line such as
+ *                    "wd33c93=255" will be automatically translated to
+ *                    "wd33c93=nosync:0xff".
+ * -  nodma:x        -x = 1 to disable DMA, x = 0 to enable it. Argument is
+ *                    optional - if not present, same as "nodma:1".
+ * -  period:ns      -ns is the minimum # of nanoseconds in a SCSI data transfer
+ *                    period. Default is 500; acceptable values are 250 - 1000.
+ * -  disconnect:x   -x = 0 to never allow disconnects, 2 to always allow them.
+ *                    x = 1 does 'adaptive' disconnects, which is the default
+ *                    and generally the best choice.
+ * -  debug:x        -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
+ *                    various types of debug output to printed - see the DB_xxx
+ *                    defines in wd33c93.h
+ * -  clock:x        -x = clock input in MHz for WD33c93 chip. Normal values
+ *                    would be from 8 through 20. Default is 8.
+ * -  burst:x        -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use
+ *                    Single Byte DMA, which is the default. Argument is
+ *                    optional - if not present, same as "burst:1".
+ * -  fast:x         -x = 1 to enable Fast SCSI, which is only effective with
+ *                    input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable
+ *                    it, which is the default.  Argument is optional - if not
+ *                    present, same as "fast:1".
+ * -  next           -No argument. Used to separate blocks of keywords when
+ *                    there's more than one host adapter in the system.
+ *
+ * Syntax Notes:
+ * -  Numeric arguments can be decimal or the '0x' form of hex notation. There
+ *    _must_ be a colon between a keyword and its numeric argument, with no
+ *    spaces.
+ * -  Keywords are separated by commas, no spaces, in the standard kernel
+ *    command-line manner.
+ * -  A keyword in the 'nth' comma-separated command-line member will overwrite
+ *    the 'nth' element of setup_args[]. A blank command-line member (in
+ *    other words, a comma with no preceding keyword) will _not_ overwrite
+ *    the corresponding setup_args[] element.
+ * -  If a keyword is used more than once, the first one applies to the first
+ *    SCSI host found, the second to the second card, etc, unless the 'next'
+ *    keyword is used to change the order.
+ *
+ * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
+ * -  wd33c93=nosync:255
+ * -  wd33c93=nodma
+ * -  wd33c93=nodma:1
+ * -  wd33c93=disconnect:2,nosync:0x08,period:250
+ * -  wd33c93=debug:0x1c
+ */
+
+/* Normally, no defaults are specified */
+static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };
+
+static char *setup_strings;
+module_param(setup_strings, charp, 0);
+
+static void wd33c93_execute(struct Scsi_Host *instance);
+
+static inline uchar
+read_wd33c93(const wd33c93_regs regs, uchar reg_num)
+{
+	*regs.SASR = reg_num;
+	mb();
+	return (*regs.SCMD);
+}
+
+static unsigned long
+read_wd33c93_count(const wd33c93_regs regs)
+{
+	unsigned long value;
+
+	*regs.SASR = WD_TRANSFER_COUNT_MSB;
+	mb();
+	value = *regs.SCMD << 16;
+	value |= *regs.SCMD << 8;
+	value |= *regs.SCMD;
+	mb();
+	return value;
+}
+
+static inline uchar
+read_aux_stat(const wd33c93_regs regs)
+{
+	return *regs.SASR;
+}
+
+static inline void
+write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
+{
+	*regs.SASR = reg_num;
+	mb();
+	*regs.SCMD = value;
+	mb();
+}
+
+static void
+write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
+{
+	*regs.SASR = WD_TRANSFER_COUNT_MSB;
+	mb();
+	*regs.SCMD = value >> 16;
+	*regs.SCMD = value >> 8;
+	*regs.SCMD = value;
+	mb();
+}
+
+static inline void
+write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
+{
+	*regs.SASR = WD_COMMAND;
+	mb();
+	*regs.SCMD = cmd;
+	mb();
+}
+
+static inline void
+write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
+{
+	int i;
+
+	*regs.SASR = WD_CDB_1;
+	for (i = 0; i < len; i++)
+		*regs.SCMD = cmnd[i];
+}
+
+static inline uchar
+read_1_byte(const wd33c93_regs regs)
+{
+	uchar asr;
+	uchar x = 0;
+
+	write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+	write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);
+	do {
+		asr = read_aux_stat(regs);
+		if (asr & ASR_DBR)
+			x = read_wd33c93(regs, WD_DATA);
+	} while (!(asr & ASR_INT));
+	return x;
+}
+
+static int
+round_period(unsigned int period, const struct sx_period *sx_table)
+{
+	int x;
+
+	for (x = 1; sx_table[x].period_ns; x++) {
+		if ((period <= sx_table[x - 0].period_ns) &&
+		    (period > sx_table[x - 1].period_ns)) {
+			return x;
+		}
+	}
+	return 7;
+}
+
+/*
+ * Calculate Synchronous Transfer Register value from SDTR code.
+ */
+static uchar
+calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,
+               const struct sx_period *sx_table)
+{
+	/* When doing Fast SCSI synchronous data transfers, the corresponding
+	 * value in 'sx_table' is two times the actually used transfer period.
+	 */
+	uchar result;
+
+	if (offset && fast) {
+		fast = STR_FSS;
+		period *= 2;
+	} else {
+		fast = 0;
+	}
+	period *= 4;		/* convert SDTR code to ns */
+	result = sx_table[round_period(period,sx_table)].reg_value;
+	result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
+	result |= fast;
+	return result;
+}
+
+/*
+ * Calculate SDTR code bytes [3],[4] from period and offset.
+ */
+static inline void
+calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,
+                uchar  msg[2])
+{
+	/* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The
+	 * actually used transfer period for Fast SCSI synchronous data
+	 * transfers is half that value.
+	 */
+	period /= 4;
+	if (offset && fast)
+		period /= 2;
+	msg[0] = period;
+	msg[1] = offset;
+}
+
+static int wd33c93_queuecommand_lck(struct scsi_cmnd *cmd)
+{
+	struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
+	struct WD33C93_hostdata *hostdata;
+	struct scsi_cmnd *tmp;
+
+	hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
+
+	DB(DB_QUEUE_COMMAND,
+	   printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0]))
+
+/* Set up a few fields in the scsi_cmnd structure for our own use:
+ *  - host_scribble is the pointer to the next cmd in the input queue
+ *  - result is what you'd expect
+ */
+	cmd->host_scribble = NULL;
+	cmd->result = 0;
+
+/* We use the Scsi_Pointer structure that's included with each command
+ * as a scratchpad (as it's intended to be used!). The handy thing about
+ * the SCp.xxx fields is that they're always associated with a given
+ * cmd, and are preserved across disconnect-reselect. This means we
+ * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
+ * if we keep all the critical pointers and counters in SCp:
+ *  - SCp.ptr is the pointer into the RAM buffer
+ *  - SCp.this_residual is the size of that buffer
+ *  - SCp.buffer points to the current scatter-gather buffer
+ *  - SCp.buffers_residual tells us how many S.G. buffers there are
+ *  - SCp.have_data_in is not used
+ *  - SCp.sent_command is not used
+ *  - SCp.phase records this command's SRCID_ER bit setting
+ */
+
+	if (scsi_bufflen(cmd)) {
+		scsi_pointer->buffer = scsi_sglist(cmd);
+		scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1;
+		scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
+		scsi_pointer->this_residual = scsi_pointer->buffer->length;
+	} else {
+		scsi_pointer->buffer = NULL;
+		scsi_pointer->buffers_residual = 0;
+		scsi_pointer->ptr = NULL;
+		scsi_pointer->this_residual = 0;
+	}
+
+/* WD docs state that at the conclusion of a "LEVEL2" command, the
+ * status byte can be retrieved from the LUN register. Apparently,
+ * this is the case only for *uninterrupted* LEVEL2 commands! If
+ * there are any unexpected phases entered, even if they are 100%
+ * legal (different devices may choose to do things differently),
+ * the LEVEL2 command sequence is exited. This often occurs prior
+ * to receiving the status byte, in which case the driver does a
+ * status phase interrupt and gets the status byte on its own.
+ * While such a command can then be "resumed" (ie restarted to
+ * finish up as a LEVEL2 command), the LUN register will NOT be
+ * a valid status byte at the command's conclusion, and we must
+ * use the byte obtained during the earlier interrupt. Here, we
+ * preset SCp.Status to an illegal value (0xff) so that when
+ * this command finally completes, we can tell where the actual
+ * status byte is stored.
+ */
+
+	scsi_pointer->Status = ILLEGAL_STATUS_BYTE;
+
+	/*
+	 * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
+	 * commands are added to the head of the queue so that the desired
+	 * sense data is not lost before REQUEST_SENSE executes.
+	 */
+
+	spin_lock_irq(&hostdata->lock);
+
+	if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
+		cmd->host_scribble = (uchar *) hostdata->input_Q;
+		hostdata->input_Q = cmd;
+	} else {		/* find the end of the queue */
+		for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
+		     tmp->host_scribble;
+		     tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
+		tmp->host_scribble = (uchar *) cmd;
+	}
+
+/* We know that there's at least one command in 'input_Q' now.
+ * Go see if any of them are runnable!
+ */
+
+	wd33c93_execute(cmd->device->host);
+
+	DB(DB_QUEUE_COMMAND, printk(")Q "))
+
+	spin_unlock_irq(&hostdata->lock);
+	return 0;
+}
+
+DEF_SCSI_QCMD(wd33c93_queuecommand)
+
+/*
+ * This routine attempts to start a scsi command. If the host_card is
+ * already connected, we give up immediately. Otherwise, look through
+ * the input_Q, using the first command we find that's intended
+ * for a currently non-busy target/lun.
+ *
+ * wd33c93_execute() is always called with interrupts disabled or from
+ * the wd33c93_intr itself, which means that a wd33c93 interrupt
+ * cannot occur while we are in here.
+ */
+static void
+wd33c93_execute(struct Scsi_Host *instance)
+{
+	struct scsi_pointer *scsi_pointer;
+	struct WD33C93_hostdata *hostdata =
+	    (struct WD33C93_hostdata *) instance->hostdata;
+	const wd33c93_regs regs = hostdata->regs;
+	struct scsi_cmnd *cmd, *prev;
+
+	DB(DB_EXECUTE, printk("EX("))
+	if (hostdata->selecting || hostdata->connected) {
+		DB(DB_EXECUTE, printk(")EX-0 "))
+		return;
+	}
+
+	/*
+	 * Search through the input_Q for a command destined
+	 * for an idle target/lun.
+	 */
+
+	cmd = (struct scsi_cmnd *) hostdata->input_Q;
+	prev = NULL;
+	while (cmd) {
+		if (!(hostdata->busy[cmd->device->id] &
+		      (1 << (cmd->device->lun & 0xff))))
+			break;
+		prev = cmd;
+		cmd = (struct scsi_cmnd *) cmd->host_scribble;
+	}
+
+	/* quit if queue empty or all possible targets are busy */
+
+	if (!cmd) {
+		DB(DB_EXECUTE, printk(")EX-1 "))
+		return;
+	}
+
+	/*  remove command from queue */
+
+	if (prev)
+		prev->host_scribble = cmd->host_scribble;
+	else
+		hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
+
+#ifdef PROC_STATISTICS
+	hostdata->cmd_cnt[cmd->device->id]++;
+#endif
+
+	/*
+	 * Start the selection process
+	 */
+
+	if (cmd->sc_data_direction == DMA_TO_DEVICE)
+		write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
+	else
+		write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
+
+/* Now we need to figure out whether or not this command is a good
+ * candidate for disconnect/reselect. We guess to the best of our
+ * ability, based on a set of hierarchical rules. When several
+ * devices are operating simultaneously, disconnects are usually
+ * an advantage. In a single device system, or if only 1 device
+ * is being accessed, transfers usually go faster if disconnects
+ * are not allowed:
+ *
+ * + Commands should NEVER disconnect if hostdata->disconnect =
+ *   DIS_NEVER (this holds for tape drives also), and ALWAYS
+ *   disconnect if hostdata->disconnect = DIS_ALWAYS.
+ * + Tape drive commands should always be allowed to disconnect.
+ * + Disconnect should be allowed if disconnected_Q isn't empty.
+ * + Commands should NOT disconnect if input_Q is empty.
+ * + Disconnect should be allowed if there are commands in input_Q
+ *   for a different target/lun. In this case, the other commands
+ *   should be made disconnect-able, if not already.
+ *
+ * I know, I know - this code would flunk me out of any
+ * "C Programming 101" class ever offered. But it's easy
+ * to change around and experiment with for now.
+ */
+
+	scsi_pointer = WD33C93_scsi_pointer(cmd);
+	scsi_pointer->phase = 0;	/* assume no disconnect */
+	if (hostdata->disconnect == DIS_NEVER)
+		goto no;
+	if (hostdata->disconnect == DIS_ALWAYS)
+		goto yes;
+	if (cmd->device->type == 1)	/* tape drive? */
+		goto yes;
+	if (hostdata->disconnected_Q)	/* other commands disconnected? */
+		goto yes;
+	if (!(hostdata->input_Q))	/* input_Q empty? */
+		goto no;
+	for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
+	     prev = (struct scsi_cmnd *) prev->host_scribble) {
+		if ((prev->device->id != cmd->device->id) ||
+		    (prev->device->lun != cmd->device->lun)) {
+			for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
+			     prev = (struct scsi_cmnd *) prev->host_scribble)
+				WD33C93_scsi_pointer(prev)->phase = 1;
+			goto yes;
+		}
+	}
+
+	goto no;
+
+ yes:
+	scsi_pointer->phase = 1;
+
+#ifdef PROC_STATISTICS
+	hostdata->disc_allowed_cnt[cmd->device->id]++;
+#endif
+
+ no:
+
+	write_wd33c93(regs, WD_SOURCE_ID, scsi_pointer->phase ? SRCID_ER : 0);
+
+	write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun);
+	write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
+		      hostdata->sync_xfer[cmd->device->id]);
+	hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
+
+	if ((hostdata->level2 == L2_NONE) ||
+	    (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
+
+		/*
+		 * Do a 'Select-With-ATN' command. This will end with
+		 * one of the following interrupts:
+		 *    CSR_RESEL_AM:  failure - can try again later.
+		 *    CSR_TIMEOUT:   failure - give up.
+		 *    CSR_SELECT:    success - proceed.
+		 */
+
+		hostdata->selecting = cmd;
+
+/* Every target has its own synchronous transfer setting, kept in the
+ * sync_xfer array, and a corresponding status byte in sync_stat[].
+ * Each target's sync_stat[] entry is initialized to SX_UNSET, and its
+ * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
+ * means that the parameters are undetermined as yet, and that we
+ * need to send an SDTR message to this device after selection is
+ * complete: We set SS_FIRST to tell the interrupt routine to do so.
+ * If we've been asked not to try synchronous transfers on this
+ * target (and _all_ luns within it), we'll still send the SDTR message
+ * later, but at that time we'll negotiate for async by specifying a
+ * sync fifo depth of 0.
+ */
+		if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
+			hostdata->sync_stat[cmd->device->id] = SS_FIRST;
+		hostdata->state = S_SELECTING;
+		write_wd33c93_count(regs, 0);	/* guarantee a DATA_PHASE interrupt */
+		write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
+	} else {
+
+		/*
+		 * Do a 'Select-With-ATN-Xfer' command. This will end with
+		 * one of the following interrupts:
+		 *    CSR_RESEL_AM:  failure - can try again later.
+		 *    CSR_TIMEOUT:   failure - give up.
+		 *    anything else: success - proceed.
+		 */
+
+		hostdata->connected = cmd;
+		write_wd33c93(regs, WD_COMMAND_PHASE, 0);
+
+		/* copy command_descriptor_block into WD chip
+		 * (take advantage of auto-incrementing)
+		 */
+
+		write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
+
+		/* The wd33c93 only knows about Group 0, 1, and 5 commands when
+		 * it's doing a 'select-and-transfer'. To be safe, we write the
+		 * size of the CDB into the OWN_ID register for every case. This
+		 * way there won't be problems with vendor-unique, audio, etc.
+		 */
+
+		write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
+
+		/* When doing a non-disconnect command with DMA, we can save
+		 * ourselves a DATA phase interrupt later by setting everything
+		 * up ahead of time.
+		 */
+
+		if (scsi_pointer->phase == 0 && hostdata->no_dma == 0) {
+			if (hostdata->dma_setup(cmd,
+			    (cmd->sc_data_direction == DMA_TO_DEVICE) ?
+			     DATA_OUT_DIR : DATA_IN_DIR))
+				write_wd33c93_count(regs, 0);	/* guarantee a DATA_PHASE interrupt */
+			else {
+				write_wd33c93_count(regs,
+						scsi_pointer->this_residual);
+				write_wd33c93(regs, WD_CONTROL,
+					      CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
+				hostdata->dma = D_DMA_RUNNING;
+			}
+		} else
+			write_wd33c93_count(regs, 0);	/* guarantee a DATA_PHASE interrupt */
+
+		hostdata->state = S_RUNNING_LEVEL2;
+		write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
+	}
+
+	/*
+	 * Since the SCSI bus can handle only 1 connection at a time,
+	 * we get out of here now. If the selection fails, or when
+	 * the command disconnects, we'll come back to this routine
+	 * to search the input_Q again...
+	 */
+
+	DB(DB_EXECUTE,
+	   printk("%s)EX-2 ", scsi_pointer->phase ? "d:" : ""))
+}
+
+static void
+transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
+	     int data_in_dir, struct WD33C93_hostdata *hostdata)
+{
+	uchar asr;
+
+	DB(DB_TRANSFER,
+	   printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
+
+	write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+	write_wd33c93_count(regs, cnt);
+	write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
+	if (data_in_dir) {
+		do {
+			asr = read_aux_stat(regs);
+			if (asr & ASR_DBR)
+				*buf++ = read_wd33c93(regs, WD_DATA);
+		} while (!(asr & ASR_INT));
+	} else {
+		do {
+			asr = read_aux_stat(regs);
+			if (asr & ASR_DBR)
+				write_wd33c93(regs, WD_DATA, *buf++);
+		} while (!(asr & ASR_INT));
+	}
+
+	/* Note: we are returning with the interrupt UN-cleared.
+	 * Since (presumably) an entire I/O operation has
+	 * completed, the bus phase is probably different, and
+	 * the interrupt routine will discover this when it
+	 * responds to the uncleared int.
+	 */
+
+}
+
+static void
+transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
+		int data_in_dir)
+{
+	struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
+	struct WD33C93_hostdata *hostdata;
+	unsigned long length;
+
+	hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
+
+/* Normally, you'd expect 'this_residual' to be non-zero here.
+ * In a series of scatter-gather transfers, however, this
+ * routine will usually be called with 'this_residual' equal
+ * to 0 and 'buffers_residual' non-zero. This means that a
+ * previous transfer completed, clearing 'this_residual', and
+ * now we need to setup the next scatter-gather buffer as the
+ * source or destination for THIS transfer.
+ */
+	if (!scsi_pointer->this_residual && scsi_pointer->buffers_residual) {
+		scsi_pointer->buffer = sg_next(scsi_pointer->buffer);
+		--scsi_pointer->buffers_residual;
+		scsi_pointer->this_residual = scsi_pointer->buffer->length;
+		scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
+	}
+	if (!scsi_pointer->this_residual) /* avoid bogus setups */
+		return;
+
+	write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
+		      hostdata->sync_xfer[cmd->device->id]);
+
+/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
+ * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
+ */
+
+	if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
+#ifdef PROC_STATISTICS
+		hostdata->pio_cnt++;
+#endif
+		transfer_pio(regs, (uchar *) scsi_pointer->ptr,
+			     scsi_pointer->this_residual, data_in_dir,
+			     hostdata);
+		length = scsi_pointer->this_residual;
+		scsi_pointer->this_residual = read_wd33c93_count(regs);
+		scsi_pointer->ptr += length - scsi_pointer->this_residual;
+	}
+
+/* We are able to do DMA (in fact, the Amiga hardware is
+ * already going!), so start up the wd33c93 in DMA mode.
+ * We set 'hostdata->dma' = D_DMA_RUNNING so that when the
+ * transfer completes and causes an interrupt, we're
+ * reminded to tell the Amiga to shut down its end. We'll
+ * postpone the updating of 'this_residual' and 'ptr'
+ * until then.
+ */
+
+	else {
+#ifdef PROC_STATISTICS
+		hostdata->dma_cnt++;
+#endif
+		write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
+		write_wd33c93_count(regs, scsi_pointer->this_residual);
+
+		if ((hostdata->level2 >= L2_DATA) ||
+		    (hostdata->level2 == L2_BASIC && scsi_pointer->phase == 0)) {
+			write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
+			write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
+			hostdata->state = S_RUNNING_LEVEL2;
+		} else
+			write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
+
+		hostdata->dma = D_DMA_RUNNING;
+	}
+}
+
+void
+wd33c93_intr(struct Scsi_Host *instance)
+{
+	struct scsi_pointer *scsi_pointer;
+	struct WD33C93_hostdata *hostdata =
+	    (struct WD33C93_hostdata *) instance->hostdata;
+	const wd33c93_regs regs = hostdata->regs;
+	struct scsi_cmnd *patch, *cmd;
+	uchar asr, sr, phs, id, lun, *ucp, msg;
+	unsigned long length, flags;
+
+	asr = read_aux_stat(regs);
+	if (!(asr & ASR_INT) || (asr & ASR_BSY))
+		return;
+
+	spin_lock_irqsave(&hostdata->lock, flags);
+
+#ifdef PROC_STATISTICS
+	hostdata->int_cnt++;
+#endif
+
+	cmd = (struct scsi_cmnd *) hostdata->connected;	/* assume we're connected */
+	scsi_pointer = WD33C93_scsi_pointer(cmd);
+	sr = read_wd33c93(regs, WD_SCSI_STATUS);	/* clear the interrupt */
+	phs = read_wd33c93(regs, WD_COMMAND_PHASE);
+
+	DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
+
+/* After starting a DMA transfer, the next interrupt
+ * is guaranteed to be in response to completion of
+ * the transfer. Since the Amiga DMA hardware runs in
+ * in an open-ended fashion, it needs to be told when
+ * to stop; do that here if D_DMA_RUNNING is true.
+ * Also, we have to update 'this_residual' and 'ptr'
+ * based on the contents of the TRANSFER_COUNT register,
+ * in case the device decided to do an intermediate
+ * disconnect (a device may do this if it has to do a
+ * seek, or just to be nice and let other devices have
+ * some bus time during long transfers). After doing
+ * whatever is needed, we go on and service the WD3393
+ * interrupt normally.
+ */
+	    if (hostdata->dma == D_DMA_RUNNING) {
+		DB(DB_TRANSFER,
+		   printk("[%p/%d:", scsi_pointer->ptr, scsi_pointer->this_residual))
+		    hostdata->dma_stop(cmd->device->host, cmd, 1);
+		hostdata->dma = D_DMA_OFF;
+		length = scsi_pointer->this_residual;
+		scsi_pointer->this_residual = read_wd33c93_count(regs);
+		scsi_pointer->ptr += length - scsi_pointer->this_residual;
+		DB(DB_TRANSFER,
+		   printk("%p/%d]", scsi_pointer->ptr, scsi_pointer->this_residual))
+	}
+
+/* Respond to the specific WD3393 interrupt - there are quite a few! */
+	switch (sr) {
+	case CSR_TIMEOUT:
+		DB(DB_INTR, printk("TIMEOUT"))
+
+		    if (hostdata->state == S_RUNNING_LEVEL2)
+			hostdata->connected = NULL;
+		else {
+			cmd = (struct scsi_cmnd *) hostdata->selecting;	/* get a valid cmd */
+			hostdata->selecting = NULL;
+		}
+
+		cmd->result = DID_NO_CONNECT << 16;
+		hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
+		hostdata->state = S_UNCONNECTED;
+		scsi_done(cmd);
+
+		/* From esp.c:
+		 * There is a window of time within the scsi_done() path
+		 * of execution where interrupts are turned back on full
+		 * blast and left that way.  During that time we could
+		 * reconnect to a disconnected command, then we'd bomb
+		 * out below.  We could also end up executing two commands
+		 * at _once_.  ...just so you know why the restore_flags()
+		 * is here...
+		 */
+
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+
+/* We are not connected to a target - check to see if there
+ * are commands waiting to be executed.
+ */
+
+		wd33c93_execute(instance);
+		break;
+
+/* Note: this interrupt should not occur in a LEVEL2 command */
+
+	case CSR_SELECT:
+		DB(DB_INTR, printk("SELECT"))
+		    hostdata->connected = cmd =
+		    (struct scsi_cmnd *) hostdata->selecting;
+		hostdata->selecting = NULL;
+
+		/* construct an IDENTIFY message with correct disconnect bit */
+
+		hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun);
+		if (scsi_pointer->phase)
+			hostdata->outgoing_msg[0] |= 0x40;
+
+		if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
+
+			hostdata->sync_stat[cmd->device->id] = SS_WAITING;
+
+/* Tack on a 2nd message to ask about synchronous transfers. If we've
+ * been asked to do only asynchronous transfers on this device, we
+ * request a fifo depth of 0, which is equivalent to async - should
+ * solve the problems some people have had with GVP's Guru ROM.
+ */
+
+			hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
+			hostdata->outgoing_msg[2] = 3;
+			hostdata->outgoing_msg[3] = EXTENDED_SDTR;
+			if (hostdata->no_sync & (1 << cmd->device->id)) {
+				calc_sync_msg(hostdata->default_sx_per, 0,
+						0, hostdata->outgoing_msg + 4);
+			} else {
+				calc_sync_msg(optimum_sx_per(hostdata),
+						OPTIMUM_SX_OFF,
+						hostdata->fast,
+						hostdata->outgoing_msg + 4);
+			}
+			hostdata->outgoing_len = 6;
+#ifdef SYNC_DEBUG
+			ucp = hostdata->outgoing_msg + 1;
+			printk(" sending SDTR %02x03%02x%02x%02x ",
+				ucp[0], ucp[2], ucp[3], ucp[4]);
+#endif
+		} else
+			hostdata->outgoing_len = 1;
+
+		hostdata->state = S_CONNECTED;
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	case CSR_XFER_DONE | PHS_DATA_IN:
+	case CSR_UNEXP | PHS_DATA_IN:
+	case CSR_SRV_REQ | PHS_DATA_IN:
+		DB(DB_INTR,
+		   printk("IN-%d.%d", scsi_pointer->this_residual,
+			  scsi_pointer->buffers_residual))
+		    transfer_bytes(regs, cmd, DATA_IN_DIR);
+		if (hostdata->state != S_RUNNING_LEVEL2)
+			hostdata->state = S_CONNECTED;
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	case CSR_XFER_DONE | PHS_DATA_OUT:
+	case CSR_UNEXP | PHS_DATA_OUT:
+	case CSR_SRV_REQ | PHS_DATA_OUT:
+		DB(DB_INTR,
+		   printk("OUT-%d.%d", scsi_pointer->this_residual,
+			  scsi_pointer->buffers_residual))
+		    transfer_bytes(regs, cmd, DATA_OUT_DIR);
+		if (hostdata->state != S_RUNNING_LEVEL2)
+			hostdata->state = S_CONNECTED;
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+/* Note: this interrupt should not occur in a LEVEL2 command */
+
+	case CSR_XFER_DONE | PHS_COMMAND:
+	case CSR_UNEXP | PHS_COMMAND:
+	case CSR_SRV_REQ | PHS_COMMAND:
+		DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0]))
+		    transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
+				 hostdata);
+		hostdata->state = S_CONNECTED;
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	case CSR_XFER_DONE | PHS_STATUS:
+	case CSR_UNEXP | PHS_STATUS:
+	case CSR_SRV_REQ | PHS_STATUS:
+		DB(DB_INTR, printk("STATUS="))
+		scsi_pointer->Status = read_1_byte(regs);
+		DB(DB_INTR, printk("%02x", scsi_pointer->Status))
+		    if (hostdata->level2 >= L2_BASIC) {
+			sr = read_wd33c93(regs, WD_SCSI_STATUS);	/* clear interrupt */
+			udelay(7);
+			hostdata->state = S_RUNNING_LEVEL2;
+			write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
+			write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
+		} else {
+			hostdata->state = S_CONNECTED;
+		}
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	case CSR_XFER_DONE | PHS_MESS_IN:
+	case CSR_UNEXP | PHS_MESS_IN:
+	case CSR_SRV_REQ | PHS_MESS_IN:
+		DB(DB_INTR, printk("MSG_IN="))
+
+		msg = read_1_byte(regs);
+		sr = read_wd33c93(regs, WD_SCSI_STATUS);	/* clear interrupt */
+		udelay(7);
+
+		hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
+		if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
+			msg = EXTENDED_MESSAGE;
+		else
+			hostdata->incoming_ptr = 0;
+
+		scsi_pointer->Message = msg;
+		switch (msg) {
+
+		case COMMAND_COMPLETE:
+			DB(DB_INTR, printk("CCMP"))
+			    write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+			hostdata->state = S_PRE_CMP_DISC;
+			break;
+
+		case SAVE_POINTERS:
+			DB(DB_INTR, printk("SDP"))
+			    write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+			hostdata->state = S_CONNECTED;
+			break;
+
+		case RESTORE_POINTERS:
+			DB(DB_INTR, printk("RDP"))
+			    if (hostdata->level2 >= L2_BASIC) {
+				write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
+				write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
+				hostdata->state = S_RUNNING_LEVEL2;
+			} else {
+				write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+				hostdata->state = S_CONNECTED;
+			}
+			break;
+
+		case DISCONNECT:
+			DB(DB_INTR, printk("DIS"))
+			    cmd->device->disconnect = 1;
+			write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+			hostdata->state = S_PRE_TMP_DISC;
+			break;
+
+		case MESSAGE_REJECT:
+			DB(DB_INTR, printk("REJ"))
+#ifdef SYNC_DEBUG
+			    printk("-REJ-");
+#endif
+			if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
+				hostdata->sync_stat[cmd->device->id] = SS_SET;
+				/* we want default_sx_per, not DEFAULT_SX_PER */
+				hostdata->sync_xfer[cmd->device->id] =
+					calc_sync_xfer(hostdata->default_sx_per
+						/ 4, 0, 0, hostdata->sx_table);
+			}
+			write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+			hostdata->state = S_CONNECTED;
+			break;
+
+		case EXTENDED_MESSAGE:
+			DB(DB_INTR, printk("EXT"))
+
+			    ucp = hostdata->incoming_msg;
+
+#ifdef SYNC_DEBUG
+			printk("%02x", ucp[hostdata->incoming_ptr]);
+#endif
+			/* Is this the last byte of the extended message? */
+
+			if ((hostdata->incoming_ptr >= 2) &&
+			    (hostdata->incoming_ptr == (ucp[1] + 1))) {
+
+				switch (ucp[2]) {	/* what's the EXTENDED code? */
+				case EXTENDED_SDTR:
+					/* default to default async period */
+					id = calc_sync_xfer(hostdata->
+							default_sx_per / 4, 0,
+							0, hostdata->sx_table);
+					if (hostdata->sync_stat[cmd->device->id] !=
+					    SS_WAITING) {
+
+/* A device has sent an unsolicited SDTR message; rather than go
+ * through the effort of decoding it and then figuring out what
+ * our reply should be, we're just gonna say that we have a
+ * synchronous fifo depth of 0. This will result in asynchronous
+ * transfers - not ideal but so much easier.
+ * Actually, this is OK because it assures us that if we don't
+ * specifically ask for sync transfers, we won't do any.
+ */
+
+						write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
+						hostdata->outgoing_msg[0] =
+						    EXTENDED_MESSAGE;
+						hostdata->outgoing_msg[1] = 3;
+						hostdata->outgoing_msg[2] =
+						    EXTENDED_SDTR;
+						calc_sync_msg(hostdata->
+							default_sx_per, 0,
+							0, hostdata->outgoing_msg + 3);
+						hostdata->outgoing_len = 5;
+					} else {
+						if (ucp[4]) /* well, sync transfer */
+							id = calc_sync_xfer(ucp[3], ucp[4],
+									hostdata->fast,
+									hostdata->sx_table);
+						else if (ucp[3]) /* very unlikely... */
+							id = calc_sync_xfer(ucp[3], ucp[4],
+									0, hostdata->sx_table);
+					}
+					hostdata->sync_xfer[cmd->device->id] = id;
+#ifdef SYNC_DEBUG
+					printk(" sync_xfer=%02x\n",
+					       hostdata->sync_xfer[cmd->device->id]);
+#endif
+					hostdata->sync_stat[cmd->device->id] =
+					    SS_SET;
+					write_wd33c93_cmd(regs,
+							  WD_CMD_NEGATE_ACK);
+					hostdata->state = S_CONNECTED;
+					break;
+				case EXTENDED_WDTR:
+					write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
+					printk("sending WDTR ");
+					hostdata->outgoing_msg[0] =
+					    EXTENDED_MESSAGE;
+					hostdata->outgoing_msg[1] = 2;
+					hostdata->outgoing_msg[2] =
+					    EXTENDED_WDTR;
+					hostdata->outgoing_msg[3] = 0;	/* 8 bit transfer width */
+					hostdata->outgoing_len = 4;
+					write_wd33c93_cmd(regs,
+							  WD_CMD_NEGATE_ACK);
+					hostdata->state = S_CONNECTED;
+					break;
+				default:
+					write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
+					printk
+					    ("Rejecting Unknown Extended Message(%02x). ",
+					     ucp[2]);
+					hostdata->outgoing_msg[0] =
+					    MESSAGE_REJECT;
+					hostdata->outgoing_len = 1;
+					write_wd33c93_cmd(regs,
+							  WD_CMD_NEGATE_ACK);
+					hostdata->state = S_CONNECTED;
+					break;
+				}
+				hostdata->incoming_ptr = 0;
+			}
+
+			/* We need to read more MESS_IN bytes for the extended message */
+
+			else {
+				hostdata->incoming_ptr++;
+				write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+				hostdata->state = S_CONNECTED;
+			}
+			break;
+
+		default:
+			printk("Rejecting Unknown Message(%02x) ", msg);
+			write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
+			hostdata->outgoing_msg[0] = MESSAGE_REJECT;
+			hostdata->outgoing_len = 1;
+			write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+			hostdata->state = S_CONNECTED;
+		}
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+/* Note: this interrupt will occur only after a LEVEL2 command */
+
+	case CSR_SEL_XFER_DONE:
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
+		if (phs == 0x60) {
+			DB(DB_INTR, printk("SX-DONE"))
+			    scsi_pointer->Message = COMMAND_COMPLETE;
+			lun = read_wd33c93(regs, WD_TARGET_LUN);
+			DB(DB_INTR, printk(":%d.%d", scsi_pointer->Status, lun))
+			    hostdata->connected = NULL;
+			hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
+			hostdata->state = S_UNCONNECTED;
+			if (scsi_pointer->Status == ILLEGAL_STATUS_BYTE)
+				scsi_pointer->Status = lun;
+			if (cmd->cmnd[0] == REQUEST_SENSE
+			    && scsi_pointer->Status != SAM_STAT_GOOD) {
+				set_host_byte(cmd, DID_ERROR);
+			} else {
+				set_host_byte(cmd, DID_OK);
+				scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
+				set_status_byte(cmd, scsi_pointer->Status);
+			}
+			scsi_done(cmd);
+
+/* We are no longer  connected to a target - check to see if
+ * there are commands waiting to be executed.
+ */
+			spin_unlock_irqrestore(&hostdata->lock, flags);
+			wd33c93_execute(instance);
+		} else {
+			printk
+			    ("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---",
+			     asr, sr, phs);
+			spin_unlock_irqrestore(&hostdata->lock, flags);
+		}
+		break;
+
+/* Note: this interrupt will occur only after a LEVEL2 command */
+
+	case CSR_SDP:
+		DB(DB_INTR, printk("SDP"))
+		    hostdata->state = S_RUNNING_LEVEL2;
+		write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
+		write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	case CSR_XFER_DONE | PHS_MESS_OUT:
+	case CSR_UNEXP | PHS_MESS_OUT:
+	case CSR_SRV_REQ | PHS_MESS_OUT:
+		DB(DB_INTR, printk("MSG_OUT="))
+
+/* To get here, we've probably requested MESSAGE_OUT and have
+ * already put the correct bytes in outgoing_msg[] and filled
+ * in outgoing_len. We simply send them out to the SCSI bus.
+ * Sometimes we get MESSAGE_OUT phase when we're not expecting
+ * it - like when our SDTR message is rejected by a target. Some
+ * targets send the REJECT before receiving all of the extended
+ * message, and then seem to go back to MESSAGE_OUT for a byte
+ * or two. Not sure why, or if I'm doing something wrong to
+ * cause this to happen. Regardless, it seems that sending
+ * NOP messages in these situations results in no harm and
+ * makes everyone happy.
+ */
+		    if (hostdata->outgoing_len == 0) {
+			hostdata->outgoing_len = 1;
+			hostdata->outgoing_msg[0] = NOP;
+		}
+		transfer_pio(regs, hostdata->outgoing_msg,
+			     hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
+		DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
+		    hostdata->outgoing_len = 0;
+		hostdata->state = S_CONNECTED;
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	case CSR_UNEXP_DISC:
+
+/* I think I've seen this after a request-sense that was in response
+ * to an error condition, but not sure. We certainly need to do
+ * something when we get this interrupt - the question is 'what?'.
+ * Let's think positively, and assume some command has finished
+ * in a legal manner (like a command that provokes a request-sense),
+ * so we treat it as a normal command-complete-disconnect.
+ */
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
+		if (cmd == NULL) {
+			printk(" - Already disconnected! ");
+			hostdata->state = S_UNCONNECTED;
+			spin_unlock_irqrestore(&hostdata->lock, flags);
+			return;
+		}
+		DB(DB_INTR, printk("UNEXP_DISC"))
+		    hostdata->connected = NULL;
+		hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
+		hostdata->state = S_UNCONNECTED;
+		if (cmd->cmnd[0] == REQUEST_SENSE &&
+		    scsi_pointer->Status != SAM_STAT_GOOD) {
+			set_host_byte(cmd, DID_ERROR);
+		} else {
+			set_host_byte(cmd, DID_OK);
+			scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
+			set_status_byte(cmd, scsi_pointer->Status);
+		}
+		scsi_done(cmd);
+
+/* We are no longer connected to a target - check to see if
+ * there are commands waiting to be executed.
+ */
+		/* look above for comments on scsi_done() */
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		wd33c93_execute(instance);
+		break;
+
+	case CSR_DISC:
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
+		DB(DB_INTR, printk("DISC"))
+		    if (cmd == NULL) {
+			printk(" - Already disconnected! ");
+			hostdata->state = S_UNCONNECTED;
+		}
+		switch (hostdata->state) {
+		case S_PRE_CMP_DISC:
+			hostdata->connected = NULL;
+			hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
+			hostdata->state = S_UNCONNECTED;
+			DB(DB_INTR, printk(":%d", scsi_pointer->Status))
+			if (cmd->cmnd[0] == REQUEST_SENSE
+			    && scsi_pointer->Status != SAM_STAT_GOOD) {
+				set_host_byte(cmd, DID_ERROR);
+			} else {
+				set_host_byte(cmd, DID_OK);
+				scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
+				set_status_byte(cmd, scsi_pointer->Status);
+			}
+			scsi_done(cmd);
+			break;
+		case S_PRE_TMP_DISC:
+		case S_RUNNING_LEVEL2:
+			cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
+			hostdata->disconnected_Q = cmd;
+			hostdata->connected = NULL;
+			hostdata->state = S_UNCONNECTED;
+
+#ifdef PROC_STATISTICS
+			hostdata->disc_done_cnt[cmd->device->id]++;
+#endif
+
+			break;
+		default:
+			printk("*** Unexpected DISCONNECT interrupt! ***");
+			hostdata->state = S_UNCONNECTED;
+		}
+
+/* We are no longer connected to a target - check to see if
+ * there are commands waiting to be executed.
+ */
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+		wd33c93_execute(instance);
+		break;
+
+	case CSR_RESEL_AM:
+	case CSR_RESEL:
+		DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
+
+		    /* Old chips (pre -A ???) don't have advanced features and will
+		     * generate CSR_RESEL.  In that case we have to extract the LUN the
+		     * hard way (see below).
+		     * First we have to make sure this reselection didn't
+		     * happen during Arbitration/Selection of some other device.
+		     * If yes, put losing command back on top of input_Q.
+		     */
+		    if (hostdata->level2 <= L2_NONE) {
+
+			if (hostdata->selecting) {
+				cmd = (struct scsi_cmnd *) hostdata->selecting;
+				hostdata->selecting = NULL;
+				hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
+				cmd->host_scribble =
+				    (uchar *) hostdata->input_Q;
+				hostdata->input_Q = cmd;
+			}
+		}
+
+		else {
+
+			if (cmd) {
+				if (phs == 0x00) {
+					hostdata->busy[cmd->device->id] &=
+						~(1 << (cmd->device->lun & 0xff));
+					cmd->host_scribble =
+					    (uchar *) hostdata->input_Q;
+					hostdata->input_Q = cmd;
+				} else {
+					printk
+					    ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
+					     asr, sr, phs);
+					while (1)
+						printk("\r");
+				}
+			}
+
+		}
+
+		/* OK - find out which device reselected us. */
+
+		id = read_wd33c93(regs, WD_SOURCE_ID);
+		id &= SRCID_MASK;
+
+		/* and extract the lun from the ID message. (Note that we don't
+		 * bother to check for a valid message here - I guess this is
+		 * not the right way to go, but...)
+		 */
+
+		if (sr == CSR_RESEL_AM) {
+			lun = read_wd33c93(regs, WD_DATA);
+			if (hostdata->level2 < L2_RESELECT)
+				write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
+			lun &= 7;
+		} else {
+			/* Old chip; wait for msgin phase to pick up the LUN. */
+			for (lun = 255; lun; lun--) {
+				if ((asr = read_aux_stat(regs)) & ASR_INT)
+					break;
+				udelay(10);
+			}
+			if (!(asr & ASR_INT)) {
+				printk
+				    ("wd33c93: Reselected without IDENTIFY\n");
+				lun = 0;
+			} else {
+				/* Verify this is a change to MSG_IN and read the message */
+				sr = read_wd33c93(regs, WD_SCSI_STATUS);
+				udelay(7);
+				if (sr == (CSR_ABORT | PHS_MESS_IN) ||
+				    sr == (CSR_UNEXP | PHS_MESS_IN) ||
+				    sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
+					/* Got MSG_IN, grab target LUN */
+					lun = read_1_byte(regs);
+					/* Now we expect a 'paused with ACK asserted' int.. */
+					asr = read_aux_stat(regs);
+					if (!(asr & ASR_INT)) {
+						udelay(10);
+						asr = read_aux_stat(regs);
+						if (!(asr & ASR_INT))
+							printk
+							    ("wd33c93: No int after LUN on RESEL (%02x)\n",
+							     asr);
+					}
+					sr = read_wd33c93(regs, WD_SCSI_STATUS);
+					udelay(7);
+					if (sr != CSR_MSGIN)
+						printk
+						    ("wd33c93: Not paused with ACK on RESEL (%02x)\n",
+						     sr);
+					lun &= 7;
+					write_wd33c93_cmd(regs,
+							  WD_CMD_NEGATE_ACK);
+				} else {
+					printk
+					    ("wd33c93: Not MSG_IN on reselect (%02x)\n",
+					     sr);
+					lun = 0;
+				}
+			}
+		}
+
+		/* Now we look for the command that's reconnecting. */
+
+		cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
+		patch = NULL;
+		while (cmd) {
+			if (id == cmd->device->id && lun == (u8)cmd->device->lun)
+				break;
+			patch = cmd;
+			cmd = (struct scsi_cmnd *) cmd->host_scribble;
+		}
+
+		/* Hmm. Couldn't find a valid command.... What to do? */
+
+		if (!cmd) {
+			printk
+			    ("---TROUBLE: target %d.%d not in disconnect queue---",
+			     id, (u8)lun);
+			spin_unlock_irqrestore(&hostdata->lock, flags);
+			return;
+		}
+
+		/* Ok, found the command - now start it up again. */
+
+		if (patch)
+			patch->host_scribble = cmd->host_scribble;
+		else
+			hostdata->disconnected_Q =
+			    (struct scsi_cmnd *) cmd->host_scribble;
+		hostdata->connected = cmd;
+
+		/* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
+		 * because these things are preserved over a disconnect.
+		 * But we DO need to fix the DPD bit so it's correct for this command.
+		 */
+
+		if (cmd->sc_data_direction == DMA_TO_DEVICE)
+			write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
+		else
+			write_wd33c93(regs, WD_DESTINATION_ID,
+				      cmd->device->id | DSTID_DPD);
+		if (hostdata->level2 >= L2_RESELECT) {
+			write_wd33c93_count(regs, 0);	/* we want a DATA_PHASE interrupt */
+			write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
+			write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
+			hostdata->state = S_RUNNING_LEVEL2;
+		} else
+			hostdata->state = S_CONNECTED;
+
+		    spin_unlock_irqrestore(&hostdata->lock, flags);
+		break;
+
+	default:
+		printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
+		spin_unlock_irqrestore(&hostdata->lock, flags);
+	}
+
+	DB(DB_INTR, printk("} "))
+
+}
+
+static void
+reset_wd33c93(struct Scsi_Host *instance)
+{
+	struct WD33C93_hostdata *hostdata =
+	    (struct WD33C93_hostdata *) instance->hostdata;
+	const wd33c93_regs regs = hostdata->regs;
+	uchar sr;
+
+#ifdef CONFIG_SGI_IP22
+	{
+		int busycount = 0;
+		extern void sgiwd93_reset(unsigned long);
+		/* wait 'til the chip gets some time for us */
+		while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
+			udelay (10);
+	/*
+ 	 * there are scsi devices out there, which manage to lock up
+	 * the wd33c93 in a busy condition. In this state it won't
+	 * accept the reset command. The only way to solve this is to
+ 	 * give the chip a hardware reset (if possible). The code below
+	 * does this for the SGI Indy, where this is possible
+	 */
+	/* still busy ? */
+	if (read_aux_stat(regs) & ASR_BSY)
+		sgiwd93_reset(instance->base); /* yeah, give it the hard one */
+	}
+#endif
+
+	write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
+		      instance->this_id | hostdata->clock_freq);
+	write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+	write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
+		      calc_sync_xfer(hostdata->default_sx_per / 4,
+				     DEFAULT_SX_OFF, 0, hostdata->sx_table));
+	write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
+
+
+#ifdef CONFIG_MVME147_SCSI
+	udelay(25);		/* The old wd33c93 on MVME147 needs this, at least */
+#endif
+
+	while (!(read_aux_stat(regs) & ASR_INT))
+		;
+	sr = read_wd33c93(regs, WD_SCSI_STATUS);
+
+	hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
+	if (sr == 0x00)
+		hostdata->chip = C_WD33C93;
+	else if (sr == 0x01) {
+		write_wd33c93(regs, WD_QUEUE_TAG, 0xa5);	/* any random number */
+		sr = read_wd33c93(regs, WD_QUEUE_TAG);
+		if (sr == 0xa5) {
+			hostdata->chip = C_WD33C93B;
+			write_wd33c93(regs, WD_QUEUE_TAG, 0);
+		} else
+			hostdata->chip = C_WD33C93A;
+	} else
+		hostdata->chip = C_UNKNOWN_CHIP;
+
+	if (hostdata->chip != C_WD33C93B)	/* Fast SCSI unavailable */
+		hostdata->fast = 0;
+
+	write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
+	write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+}
+
+int
+wd33c93_host_reset(struct scsi_cmnd * SCpnt)
+{
+	struct Scsi_Host *instance;
+	struct WD33C93_hostdata *hostdata;
+	int i;
+
+	instance = SCpnt->device->host;
+	spin_lock_irq(instance->host_lock);
+	hostdata = (struct WD33C93_hostdata *) instance->hostdata;
+
+	printk("scsi%d: reset. ", instance->host_no);
+	disable_irq(instance->irq);
+
+	hostdata->dma_stop(instance, NULL, 0);
+	for (i = 0; i < 8; i++) {
+		hostdata->busy[i] = 0;
+		hostdata->sync_xfer[i] =
+			calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
+					0, hostdata->sx_table);
+		hostdata->sync_stat[i] = SS_UNSET;	/* using default sync values */
+	}
+	hostdata->input_Q = NULL;
+	hostdata->selecting = NULL;
+	hostdata->connected = NULL;
+	hostdata->disconnected_Q = NULL;
+	hostdata->state = S_UNCONNECTED;
+	hostdata->dma = D_DMA_OFF;
+	hostdata->incoming_ptr = 0;
+	hostdata->outgoing_len = 0;
+
+	reset_wd33c93(instance);
+	SCpnt->result = DID_RESET << 16;
+	enable_irq(instance->irq);
+	spin_unlock_irq(instance->host_lock);
+	return SUCCESS;
+}
+
+int
+wd33c93_abort(struct scsi_cmnd * cmd)
+{
+	struct Scsi_Host *instance;
+	struct WD33C93_hostdata *hostdata;
+	wd33c93_regs regs;
+	struct scsi_cmnd *tmp, *prev;
+
+	disable_irq(cmd->device->host->irq);
+
+	instance = cmd->device->host;
+	hostdata = (struct WD33C93_hostdata *) instance->hostdata;
+	regs = hostdata->regs;
+
+/*
+ * Case 1 : If the command hasn't been issued yet, we simply remove it
+ *     from the input_Q.
+ */
+
+	tmp = (struct scsi_cmnd *) hostdata->input_Q;
+	prev = NULL;
+	while (tmp) {
+		if (tmp == cmd) {
+			if (prev)
+				prev->host_scribble = cmd->host_scribble;
+			else
+				hostdata->input_Q =
+				    (struct scsi_cmnd *) cmd->host_scribble;
+			cmd->host_scribble = NULL;
+			cmd->result = DID_ABORT << 16;
+			printk
+			    ("scsi%d: Abort - removing command from input_Q. ",
+			     instance->host_no);
+			enable_irq(cmd->device->host->irq);
+			scsi_done(cmd);
+			return SUCCESS;
+		}
+		prev = tmp;
+		tmp = (struct scsi_cmnd *) tmp->host_scribble;
+	}
+
+/*
+ * Case 2 : If the command is connected, we're going to fail the abort
+ *     and let the high level SCSI driver retry at a later time or
+ *     issue a reset.
+ *
+ *     Timeouts, and therefore aborted commands, will be highly unlikely
+ *     and handling them cleanly in this situation would make the common
+ *     case of noresets less efficient, and would pollute our code.  So,
+ *     we fail.
+ */
+
+	if (hostdata->connected == cmd) {
+		uchar sr, asr;
+		unsigned long timeout;
+
+		printk("scsi%d: Aborting connected command - ",
+		       instance->host_no);
+
+		printk("stopping DMA - ");
+		if (hostdata->dma == D_DMA_RUNNING) {
+			hostdata->dma_stop(instance, cmd, 0);
+			hostdata->dma = D_DMA_OFF;
+		}
+
+		printk("sending wd33c93 ABORT command - ");
+		write_wd33c93(regs, WD_CONTROL,
+			      CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+		write_wd33c93_cmd(regs, WD_CMD_ABORT);
+
+/* Now we have to attempt to flush out the FIFO... */
+
+		printk("flushing fifo - ");
+		timeout = 1000000;
+		do {
+			asr = read_aux_stat(regs);
+			if (asr & ASR_DBR)
+				read_wd33c93(regs, WD_DATA);
+		} while (!(asr & ASR_INT) && timeout-- > 0);
+		sr = read_wd33c93(regs, WD_SCSI_STATUS);
+		printk
+		    ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
+		     asr, sr, read_wd33c93_count(regs), timeout);
+
+		/*
+		 * Abort command processed.
+		 * Still connected.
+		 * We must disconnect.
+		 */
+
+		printk("sending wd33c93 DISCONNECT command - ");
+		write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
+
+		timeout = 1000000;
+		asr = read_aux_stat(regs);
+		while ((asr & ASR_CIP) && timeout-- > 0)
+			asr = read_aux_stat(regs);
+		sr = read_wd33c93(regs, WD_SCSI_STATUS);
+		printk("asr=%02x, sr=%02x.", asr, sr);
+
+		hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff));
+		hostdata->connected = NULL;
+		hostdata->state = S_UNCONNECTED;
+		cmd->result = DID_ABORT << 16;
+
+/*      sti();*/
+		wd33c93_execute(instance);
+
+		enable_irq(cmd->device->host->irq);
+		scsi_done(cmd);
+		return SUCCESS;
+	}
+
+/*
+ * Case 3: If the command is currently disconnected from the bus,
+ * we're not going to expend much effort here: Let's just return
+ * an ABORT_SNOOZE and hope for the best...
+ */
+
+	tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
+	while (tmp) {
+		if (tmp == cmd) {
+			printk
+			    ("scsi%d: Abort - command found on disconnected_Q - ",
+			     instance->host_no);
+			printk("Abort SNOOZE. ");
+			enable_irq(cmd->device->host->irq);
+			return FAILED;
+		}
+		tmp = (struct scsi_cmnd *) tmp->host_scribble;
+	}
+
+/*
+ * Case 4 : If we reached this point, the command was not found in any of
+ *     the queues.
+ *
+ * We probably reached this point because of an unlikely race condition
+ * between the command completing successfully and the abortion code,
+ * so we won't panic, but we will notify the user in case something really
+ * broke.
+ */
+
+/*   sti();*/
+	wd33c93_execute(instance);
+
+	enable_irq(cmd->device->host->irq);
+	printk("scsi%d: warning : SCSI command probably completed successfully"
+	       "         before abortion. ", instance->host_no);
+	return FAILED;
+}
+
+#define MAX_WD33C93_HOSTS 4
+#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
+#define SETUP_BUFFER_SIZE 200
+static char setup_buffer[SETUP_BUFFER_SIZE];
+static char setup_used[MAX_SETUP_ARGS];
+static int done_setup = 0;
+
+static int
+wd33c93_setup(char *str)
+{
+	int i;
+	char *p1, *p2;
+
+	/* The kernel does some processing of the command-line before calling
+	 * this function: If it begins with any decimal or hex number arguments,
+	 * ints[0] = how many numbers found and ints[1] through [n] are the values
+	 * themselves. str points to where the non-numeric arguments (if any)
+	 * start: We do our own parsing of those. We construct synthetic 'nosync'
+	 * keywords out of numeric args (to maintain compatibility with older
+	 * versions) and then add the rest of the arguments.
+	 */
+
+	p1 = setup_buffer;
+	*p1 = '\0';
+	if (str)
+		strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
+	setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
+	p1 = setup_buffer;
+	i = 0;
+	while (*p1 && (i < MAX_SETUP_ARGS)) {
+		p2 = strchr(p1, ',');
+		if (p2) {
+			*p2 = '\0';
+			if (p1 != p2)
+				setup_args[i] = p1;
+			p1 = p2 + 1;
+			i++;
+		} else {
+			setup_args[i] = p1;
+			break;
+		}
+	}
+	for (i = 0; i < MAX_SETUP_ARGS; i++)
+		setup_used[i] = 0;
+	done_setup = 1;
+
+	return 1;
+}
+__setup("wd33c93=", wd33c93_setup);
+
+/* check_setup_args() returns index if key found, 0 if not
+ */
+static int
+check_setup_args(char *key, int *flags, int *val, char *buf)
+{
+	int x;
+	char *cp;
+
+	for (x = 0; x < MAX_SETUP_ARGS; x++) {
+		if (setup_used[x])
+			continue;
+		if (!strncmp(setup_args[x], key, strlen(key)))
+			break;
+		if (!strncmp(setup_args[x], "next", strlen("next")))
+			return 0;
+	}
+	if (x == MAX_SETUP_ARGS)
+		return 0;
+	setup_used[x] = 1;
+	cp = setup_args[x] + strlen(key);
+	*val = -1;
+	if (*cp != ':')
+		return ++x;
+	cp++;
+	if ((*cp >= '0') && (*cp <= '9')) {
+		*val = simple_strtoul(cp, NULL, 0);
+	}
+	return ++x;
+}
+
+/*
+ * Calculate internal data-transfer-clock cycle from input-clock
+ * frequency (/MHz) and fill 'sx_table'.
+ *
+ * The original driver used to rely on a fixed sx_table, containing periods
+ * for (only) the lower limits of the respective input-clock-frequency ranges
+ * (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with
+ * this setting so far, it might be desirable to adjust the transfer periods
+ * closer to the really attached, possibly 25% higher, input-clock, since
+ * - the wd33c93 may really use a significant shorter period, than it has
+ *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
+ *   instead).
+ * - the wd33c93 may ask the target for a lower transfer rate, than the target
+ *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
+ *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
+ *   transfer rate).
+ */
+static inline unsigned int
+round_4(unsigned int x)
+{
+	switch (x & 3) {
+		case 1: --x;
+			break;
+		case 2: ++x;
+			fallthrough;
+		case 3: ++x;
+	}
+	return x;
+}
+
+static void
+calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
+{
+	unsigned int d, i;
+	if (mhz < 11)
+		d = 2;	/* divisor for  8-10 MHz input-clock */
+	else if (mhz < 16)
+		d = 3;	/* divisor for 12-15 MHz input-clock */
+	else
+		d = 4;	/* divisor for 16-20 MHz input-clock */
+
+	d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
+
+	sx_table[0].period_ns = 1;
+	sx_table[0].reg_value = 0x20;
+	for (i = 1; i < 8; i++) {
+		sx_table[i].period_ns = round_4((i+1)*d / 100);
+		sx_table[i].reg_value = (i+1)*0x10;
+	}
+	sx_table[7].reg_value = 0;
+	sx_table[8].period_ns = 0;
+	sx_table[8].reg_value = 0;
+}
+
+/*
+ * check and, maybe, map an init- or "clock:"- argument.
+ */
+static uchar
+set_clk_freq(int freq, int *mhz)
+{
+	int x = freq;
+	if (WD33C93_FS_8_10 == freq)
+		freq = 8;
+	else if (WD33C93_FS_12_15 == freq)
+		freq = 12;
+	else if (WD33C93_FS_16_20 == freq)
+		freq = 16;
+	else if (freq > 7 && freq < 11)
+		x = WD33C93_FS_8_10;
+		else if (freq > 11 && freq < 16)
+		x = WD33C93_FS_12_15;
+		else if (freq > 15 && freq < 21)
+		x = WD33C93_FS_16_20;
+	else {
+			/* Hmm, wouldn't it be safer to assume highest freq here? */
+		x = WD33C93_FS_8_10;
+		freq = 8;
+	}
+	*mhz = freq;
+	return x;
+}
+
+/*
+ * to be used with the resync: fast: ... options
+ */
+static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
+{
+	int i;
+	for (i = 0; i < 8; i++)
+		if (mask & (1 << i))
+			hd->sync_stat[i] = SS_UNSET;
+}
+
+void
+wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
+	     dma_setup_t setup, dma_stop_t stop, int clock_freq)
+{
+	struct WD33C93_hostdata *hostdata;
+	int i;
+	int flags;
+	int val;
+	char buf[32];
+
+	if (!done_setup && setup_strings)
+		wd33c93_setup(setup_strings);
+
+	hostdata = (struct WD33C93_hostdata *) instance->hostdata;
+
+	hostdata->regs = regs;
+	hostdata->clock_freq = set_clk_freq(clock_freq, &i);
+	calc_sx_table(i, hostdata->sx_table);
+	hostdata->dma_setup = setup;
+	hostdata->dma_stop = stop;
+	hostdata->dma_bounce_buffer = NULL;
+	hostdata->dma_bounce_len = 0;
+	for (i = 0; i < 8; i++) {
+		hostdata->busy[i] = 0;
+		hostdata->sync_xfer[i] =
+			calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
+					0, hostdata->sx_table);
+		hostdata->sync_stat[i] = SS_UNSET;	/* using default sync values */
+#ifdef PROC_STATISTICS
+		hostdata->cmd_cnt[i] = 0;
+		hostdata->disc_allowed_cnt[i] = 0;
+		hostdata->disc_done_cnt[i] = 0;
+#endif
+	}
+	hostdata->input_Q = NULL;
+	hostdata->selecting = NULL;
+	hostdata->connected = NULL;
+	hostdata->disconnected_Q = NULL;
+	hostdata->state = S_UNCONNECTED;
+	hostdata->dma = D_DMA_OFF;
+	hostdata->level2 = L2_BASIC;
+	hostdata->disconnect = DIS_ADAPTIVE;
+	hostdata->args = DEBUG_DEFAULTS;
+	hostdata->incoming_ptr = 0;
+	hostdata->outgoing_len = 0;
+	hostdata->default_sx_per = DEFAULT_SX_PER;
+	hostdata->no_dma = 0;	/* default is DMA enabled */
+
+#ifdef PROC_INTERFACE
+	hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
+	    PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
+#ifdef PROC_STATISTICS
+	hostdata->dma_cnt = 0;
+	hostdata->pio_cnt = 0;
+	hostdata->int_cnt = 0;
+#endif
+#endif
+
+	if (check_setup_args("clock", &flags, &val, buf)) {
+		hostdata->clock_freq = set_clk_freq(val, &val);
+		calc_sx_table(val, hostdata->sx_table);
+	}
+
+	if (check_setup_args("nosync", &flags, &val, buf))
+		hostdata->no_sync = val;
+
+	if (check_setup_args("nodma", &flags, &val, buf))
+		hostdata->no_dma = (val == -1) ? 1 : val;
+
+	if (check_setup_args("period", &flags, &val, buf))
+		hostdata->default_sx_per =
+		    hostdata->sx_table[round_period((unsigned int) val,
+		                                    hostdata->sx_table)].period_ns;
+
+	if (check_setup_args("disconnect", &flags, &val, buf)) {
+		if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
+			hostdata->disconnect = val;
+		else
+			hostdata->disconnect = DIS_ADAPTIVE;
+	}
+
+	if (check_setup_args("level2", &flags, &val, buf))
+		hostdata->level2 = val;
+
+	if (check_setup_args("debug", &flags, &val, buf))
+		hostdata->args = val & DB_MASK;
+
+	if (check_setup_args("burst", &flags, &val, buf))
+		hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
+
+	if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
+		&& check_setup_args("fast", &flags, &val, buf))
+		hostdata->fast = !!val;
+
+	if ((i = check_setup_args("next", &flags, &val, buf))) {
+		while (i)
+			setup_used[--i] = 1;
+	}
+#ifdef PROC_INTERFACE
+	if (check_setup_args("proc", &flags, &val, buf))
+		hostdata->proc = val;
+#endif
+
+	spin_lock_irq(&hostdata->lock);
+	reset_wd33c93(instance);
+	spin_unlock_irq(&hostdata->lock);
+
+	printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
+	       instance->host_no,
+	       (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
+							    C_WD33C93A) ?
+	       "WD33c93A" : (hostdata->chip ==
+			     C_WD33C93B) ? "WD33c93B" : "unknown",
+	       hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
+#ifdef DEBUGGING_ON
+	printk(" debug_flags=0x%02x\n", hostdata->args);
+#else
+	printk(" debugging=OFF\n");
+#endif
+	printk("           setup_args=");
+	for (i = 0; i < MAX_SETUP_ARGS; i++)
+		printk("%s,", setup_args[i]);
+	printk("\n");
+	printk("           Version %s - %s\n", WD33C93_VERSION, WD33C93_DATE);
+}
+
+int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len)
+{
+#ifdef PROC_INTERFACE
+	char *bp;
+	struct WD33C93_hostdata *hd;
+	int x;
+
+	hd = (struct WD33C93_hostdata *) instance->hostdata;
+
+/* We accept the following
+ * keywords (same format as command-line, but arguments are not optional):
+ *    debug
+ *    disconnect
+ *    period
+ *    resync
+ *    proc
+ *    nodma
+ *    level2
+ *    burst
+ *    fast
+ *    nosync
+ */
+
+	buf[len] = '\0';
+	for (bp = buf; *bp; ) {
+		while (',' == *bp || ' ' == *bp)
+			++bp;
+	if (!strncmp(bp, "debug:", 6)) {
+			hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
+	} else if (!strncmp(bp, "disconnect:", 11)) {
+			x = simple_strtoul(bp+11, &bp, 0);
+		if (x < DIS_NEVER || x > DIS_ALWAYS)
+			x = DIS_ADAPTIVE;
+		hd->disconnect = x;
+	} else if (!strncmp(bp, "period:", 7)) {
+		x = simple_strtoul(bp+7, &bp, 0);
+		hd->default_sx_per =
+			hd->sx_table[round_period((unsigned int) x,
+						  hd->sx_table)].period_ns;
+	} else if (!strncmp(bp, "resync:", 7)) {
+			set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
+	} else if (!strncmp(bp, "proc:", 5)) {
+			hd->proc = simple_strtoul(bp+5, &bp, 0);
+	} else if (!strncmp(bp, "nodma:", 6)) {
+			hd->no_dma = simple_strtoul(bp+6, &bp, 0);
+	} else if (!strncmp(bp, "level2:", 7)) {
+			hd->level2 = simple_strtoul(bp+7, &bp, 0);
+		} else if (!strncmp(bp, "burst:", 6)) {
+			hd->dma_mode =
+				simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
+		} else if (!strncmp(bp, "fast:", 5)) {
+			x = !!simple_strtol(bp+5, &bp, 0);
+			if (x != hd->fast)
+				set_resync(hd, 0xff);
+			hd->fast = x;
+		} else if (!strncmp(bp, "nosync:", 7)) {
+			x = simple_strtoul(bp+7, &bp, 0);
+			set_resync(hd, x ^ hd->no_sync);
+			hd->no_sync = x;
+		} else {
+			break; /* unknown keyword,syntax-error,... */
+		}
+	}
+	return len;
+#else
+	return 0;
+#endif
+}
+
+int
+wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance)
+{
+#ifdef PROC_INTERFACE
+	struct WD33C93_hostdata *hd;
+	struct scsi_cmnd *cmd;
+	int x;
+
+	hd = (struct WD33C93_hostdata *) instance->hostdata;
+
+	spin_lock_irq(&hd->lock);
+	if (hd->proc & PR_VERSION)
+		seq_printf(m, "\nVersion %s - %s.",
+			WD33C93_VERSION, WD33C93_DATE);
+
+	if (hd->proc & PR_INFO) {
+		seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
+			" dma_mode=%02x fast=%d",
+			hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
+		seq_puts(m, "\nsync_xfer[] =       ");
+		for (x = 0; x < 7; x++)
+			seq_printf(m, "\t%02x", hd->sync_xfer[x]);
+		seq_puts(m, "\nsync_stat[] =       ");
+		for (x = 0; x < 7; x++)
+			seq_printf(m, "\t%02x", hd->sync_stat[x]);
+	}
+#ifdef PROC_STATISTICS
+	if (hd->proc & PR_STATISTICS) {
+		seq_puts(m, "\ncommands issued:    ");
+		for (x = 0; x < 7; x++)
+			seq_printf(m, "\t%ld", hd->cmd_cnt[x]);
+		seq_puts(m, "\ndisconnects allowed:");
+		for (x = 0; x < 7; x++)
+			seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);
+		seq_puts(m, "\ndisconnects done:   ");
+		for (x = 0; x < 7; x++)
+			seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);
+		seq_printf(m,
+			"\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
+			hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
+	}
+#endif
+	if (hd->proc & PR_CONNECTED) {
+		seq_puts(m, "\nconnected:     ");
+		if (hd->connected) {
+			cmd = (struct scsi_cmnd *) hd->connected;
+			seq_printf(m, " %d:%llu(%02x)",
+				cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+		}
+	}
+	if (hd->proc & PR_INPUTQ) {
+		seq_puts(m, "\ninput_Q:       ");
+		cmd = (struct scsi_cmnd *) hd->input_Q;
+		while (cmd) {
+			seq_printf(m, " %d:%llu(%02x)",
+				cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+			cmd = (struct scsi_cmnd *) cmd->host_scribble;
+		}
+	}
+	if (hd->proc & PR_DISCQ) {
+		seq_puts(m, "\ndisconnected_Q:");
+		cmd = (struct scsi_cmnd *) hd->disconnected_Q;
+		while (cmd) {
+			seq_printf(m, " %d:%llu(%02x)",
+				cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+			cmd = (struct scsi_cmnd *) cmd->host_scribble;
+		}
+	}
+	seq_putc(m, '\n');
+	spin_unlock_irq(&hd->lock);
+#endif				/* PROC_INTERFACE */
+	return 0;
+}
+
+EXPORT_SYMBOL(wd33c93_host_reset);
+EXPORT_SYMBOL(wd33c93_init);
+EXPORT_SYMBOL(wd33c93_abort);
+EXPORT_SYMBOL(wd33c93_queuecommand);
+EXPORT_SYMBOL(wd33c93_intr);
+EXPORT_SYMBOL(wd33c93_show_info);
+EXPORT_SYMBOL(wd33c93_write_info);