Import of Linux/MIPS 2.1.14

1 files changed, 1838 insertions, 0 deletions

diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
new file mode 100644
index 000000000..fa43592c8
--- /dev/null
+++ b/drivers/scsi/wd33c93.c
@@ -0,0 +1,1838 @@
+/*
+ *    wd33c93.c - Linux-68k device driver for the Commodore
+ *                Amiga A2091/590 SCSI controller card
+ *
+ * Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ *    john@geolog.com
+ *    jshiffle@netcom.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ *
+ * 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'm
+ *          '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".
+ *
+ */
+
+#include <asm/system.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= 0x010300
+#include <linux/blk.h>
+#else
+#include "../block/blk.h"
+#endif
+
+#include "scsi.h"
+#include "hosts.h"
+#include "wd33c93.h"
+
+#ifdef MODULE
+#include <linux/module.h>
+#endif
+
+/* Leave this undefined for now - need to make some changes in the
+ * a3000/a2019/gvp11 files to get it working right
+ */
+/*#define PROC_INTERFACE*/     /* add code for /proc/scsi/wd33c93/xxx interface */
+
+#define SYNC_DEBUG         /* extra info on sync negotiation printed */
+#define DEBUGGING_ON       /* enable command-line debugging bitmask */
+#define DEBUG_DEFAULTS 0   /* default debugging bitmask */
+
+#define WD33C93_VERSION    "1.21"
+#define WD33C93_DATE       "20/Apr/1996"
+
+#ifdef DEBUGGING_ON
+#define DB(f,a) if (hostdata->args & (f)) a;
+#else
+#define DB(f,a)
+#endif
+
+#define IS_DIR_OUT(cmd) ((cmd)->cmnd[0] == WRITE_6  || \
+                         (cmd)->cmnd[0] == WRITE_10 || \
+                         (cmd)->cmnd[0] == WRITE_12)
+
+
+/*
+ * setup_strings is an array of strings that define some of the operating
+ * parameters and settings for this driver. It is used unless an amiboot
+ * or insmod command line has been specified, in which case those settings
+ * are combined with the ones here. 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 prevent sync
+ *                    negotiation on that device. To maintain backwards
+ *                    compatibility, a command-line such as "wd33c93=255" will
+ *                    be automatically translated to "wd33c93=nosync:0xff".
+ * -  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.
+ * -  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, except in the case of 'setup_strings[]' (see
+ *    below), which is simply a C array of pointers to char. Each element
+ *    in the array is a string comprising one keyword & argument.
+ * -  A keyword in the 'nth' comma-separated command-line member will overwrite
+ *    the 'nth' element of setup_strings[]. A blank command-line member (in
+ *    other words, a comma with no preceding keyword) will _not_ overwrite
+ *    the corresponding setup_strings[] 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=disconnect:2,nosync:0x08,period:250
+ * -  wd33c93=debug:0x1c
+ */
+
+static char *setup_strings[] =
+      {"","","","","","","","","","","",""};
+
+#ifdef PROC_INTERFACE
+unsigned long disc_allowed_total;
+unsigned long disc_taken_total;
+#endif
+
+
+inline uchar read_wd33c93(wd33c93_regs *regp,uchar reg_num)
+{
+   regp->SASR = reg_num;
+   return(regp->SCMD);
+}
+
+
+#define READ_AUX_STAT() (regp->SASR)
+
+
+inline void write_wd33c93(wd33c93_regs *regp,uchar reg_num, uchar value)
+{
+   regp->SASR = reg_num;
+   regp->SCMD = value;
+}
+
+
+inline void write_wd33c93_cmd(wd33c93_regs *regp, uchar cmd)
+{
+   regp->SASR = WD_COMMAND;
+   regp->SCMD = cmd;
+}
+
+
+inline uchar read_1_byte(wd33c93_regs *regp)
+{
+uchar asr;
+uchar x = 0;
+
+   write_wd33c93(regp, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+   write_wd33c93_cmd(regp, WD_CMD_TRANS_INFO|0x80);
+   do {
+      asr = READ_AUX_STAT();
+      if (asr & ASR_DBR)
+         x = read_wd33c93(regp, WD_DATA);
+      } while (!(asr & ASR_INT));
+   return x;
+}
+
+
+void write_wd33c93_count(wd33c93_regs *regp,unsigned long value)
+{
+   regp->SASR = WD_TRANSFER_COUNT_MSB;
+   regp->SCMD = value >> 16;
+   regp->SCMD = value >> 8;
+   regp->SCMD = value;
+}
+
+
+unsigned long read_wd33c93_count(wd33c93_regs *regp)
+{
+unsigned long value;
+
+   regp->SASR = WD_TRANSFER_COUNT_MSB;
+   value = regp->SCMD << 16;
+   value |= regp->SCMD << 8;
+   value |= regp->SCMD;
+   return value;
+}
+
+
+
+static struct sx_period sx_table[] = {
+   {  1, 0x20},
+   {252, 0x20},
+   {376, 0x30},
+   {500, 0x40},
+   {624, 0x50},
+   {752, 0x60},
+   {876, 0x70},
+   {1000,0x00},
+   {0,   0} };
+
+int round_period(unsigned int period)
+{
+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;
+}
+
+uchar calc_sync_xfer(unsigned int period, unsigned int offset)
+{
+uchar result;
+
+   period *= 4;   /* convert SDTR code to ns */
+   result = sx_table[round_period(period)].reg_value;
+   result |= (offset < OPTIMUM_SX_OFF)?offset:OPTIMUM_SX_OFF;
+   return result;
+}
+
+
+
+void wd33c93_execute(struct Scsi_Host *instance);
+
+int wd33c93_queuecommand (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
+{
+struct WD33C93_hostdata *hostdata;
+Scsi_Cmnd *tmp;
+unsigned long flags;
+
+
+   save_flags(flags);
+   cli();
+   hostdata = (struct WD33C93_hostdata *)cmd->host->hostdata;
+
+DB(DB_QUEUE_COMMAND,printk("Q-%d-%02x-%ld( ",cmd->target,cmd->cmnd[0],cmd->pid))
+
+/* 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
+ *  - scsi_done points to the routine we call when a cmd is finished
+ *  - result is what you'd expect
+ */
+
+   cmd->host_scribble = NULL;
+   cmd->scsi_done = done;
+   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 (cmd->use_sg) {
+      cmd->SCp.buffer = (struct scatterlist *)cmd->buffer;
+      cmd->SCp.buffers_residual = cmd->use_sg - 1;
+      cmd->SCp.ptr = (char *)cmd->SCp.buffer->address;
+      cmd->SCp.this_residual = cmd->SCp.buffer->length;
+      }
+   else {
+      cmd->SCp.buffer = NULL;
+      cmd->SCp.buffers_residual = 0;
+      cmd->SCp.ptr = (char *)cmd->request_buffer;
+      cmd->SCp.this_residual = cmd->request_bufflen;
+      }
+
+/* Preset the command status to GOOD, since that's the normal case */
+
+   cmd->SCp.Status = GOOD;
+
+   /*
+    * 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.
+    */
+
+   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=(Scsi_Cmnd *)hostdata->input_Q; tmp->host_scribble;
+            tmp=(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->host);
+
+DB(DB_QUEUE_COMMAND,printk(")Q-%ld ",cmd->pid))
+
+   restore_flags(flags);
+   return 0;
+}
+
+
+
+/*
+ * 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.
+ */
+void wd33c93_execute (struct Scsi_Host *instance)
+{
+struct WD33C93_hostdata *hostdata;
+wd33c93_regs *regp;
+Scsi_Cmnd *cmd, *prev;
+unsigned long flags;
+int i;
+
+
+   save_flags(flags);
+   cli();
+   hostdata = (struct WD33C93_hostdata *)instance->hostdata;
+   regp = hostdata->regp;
+
+DB(DB_EXECUTE,printk("EX("))
+
+   if (hostdata->selecting || hostdata->connected) {
+
+DB(DB_EXECUTE,printk(")EX-0 "))
+
+      restore_flags(flags);
+      return;
+      }
+
+    /*
+     * Search through the input_Q for a command destined
+     * for an idle target/lun.
+     */
+
+   cmd = (Scsi_Cmnd *)hostdata->input_Q;
+   prev = 0;
+   while (cmd) {
+      if (!(hostdata->busy[cmd->target] & (1 << cmd->lun)))
+         break;
+      prev = cmd;
+      cmd = (Scsi_Cmnd *)cmd->host_scribble;
+      }
+
+   /* quit if queue empty or all possible targets are busy */
+
+   if (!cmd) {
+
+DB(DB_EXECUTE,printk(")EX-1 "))
+
+      restore_flags(flags);
+      return;
+      }
+
+   /*  remove command from queue */
+   
+   if (prev)
+      prev->host_scribble = cmd->host_scribble;
+   else
+      hostdata->input_Q = (Scsi_Cmnd *)cmd->host_scribble;
+
+   /*
+    * Start the selection process
+    */
+
+   if (IS_DIR_OUT(cmd))
+      write_wd33c93(regp, WD_DESTINATION_ID, cmd->target);
+   else
+      write_wd33c93(regp, WD_DESTINATION_ID, cmd->target | 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.
+ */
+
+   cmd->SCp.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=(Scsi_Cmnd *)hostdata->input_Q; prev;
+         prev=(Scsi_Cmnd *)prev->host_scribble) {
+      if ((prev->target != cmd->target) || (prev->lun != cmd->lun)) {
+         for (prev=(Scsi_Cmnd *)hostdata->input_Q; prev;
+               prev=(Scsi_Cmnd *)prev->host_scribble)
+            prev->SCp.phase = 1;
+         goto yes;
+         }
+      }
+   goto no;
+
+yes:
+   cmd->SCp.phase = 1;
+
+#ifdef PROC_INTERFACE
+   disc_allowed_total++;
+#endif
+
+no:
+   write_wd33c93(regp, WD_SOURCE_ID, ((cmd->SCp.phase)?SRCID_ER:0));
+
+   write_wd33c93(regp, WD_TARGET_LUN, cmd->lun);
+   write_wd33c93(regp,WD_SYNCHRONOUS_TRANSFER,hostdata->sync_xfer[cmd->target]);
+   hostdata->busy[cmd->target] |= (1 << cmd->lun);
+
+   if ((hostdata->level2 == L2_NONE) ||
+       (hostdata->sync_stat[cmd->target] == 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,
+ * unless we've been asked not to try synchronous transfers on this
+ * target (and _all_ luns within it): In this case we set SS_SET to
+ * make the defaults final.
+ */
+      if (hostdata->sync_stat[cmd->target] == SS_UNSET) {
+         if (hostdata->no_sync & (1 << cmd->target))
+            hostdata->sync_stat[cmd->target] = SS_SET;
+         else
+            hostdata->sync_stat[cmd->target] = SS_FIRST;
+         }
+      hostdata->state = S_SELECTING;
+      write_wd33c93_count(regp,0); /* guarantee a DATA_PHASE interrupt */
+      write_wd33c93_cmd(regp, 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(regp, WD_COMMAND_PHASE, 0);
+
+   /* copy command_descriptor_block into WD chip
+    * (take advantage of auto-incrementing)
+    */
+
+      regp->SASR = WD_CDB_1;
+      for (i=0; i<cmd->cmd_len; i++)
+         regp->SCMD = cmd->cmnd[i];
+
+   /* 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(regp, WD_OWN_ID, cmd->cmd_len);
+
+   /* When doing a non-disconnect command, we can save ourselves a DATA
+    * phase interrupt later by setting everything up now.
+    */
+
+      if (cmd->SCp.phase == 0) {
+         if (hostdata->dma_setup(cmd,
+                     (IS_DIR_OUT(cmd))?DATA_OUT_DIR:DATA_IN_DIR))
+            write_wd33c93_count(regp,0); /* guarantee a DATA_PHASE interrupt */
+         else {
+            write_wd33c93_count(regp, cmd->SCp.this_residual);
+            write_wd33c93(regp,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_DMA);
+            hostdata->dma = D_DMA_RUNNING;
+            }
+         }
+      else
+         write_wd33c93_count(regp,0); /* guarantee a DATA_PHASE interrupt */
+
+      hostdata->state = S_RUNNING_LEVEL2;
+      write_wd33c93_cmd(regp, 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%ld)EX-2 ",(cmd->SCp.phase)?"d:":"",cmd->pid))
+
+   restore_flags(flags);
+}
+
+
+
+void transfer_pio(wd33c93_regs *regp, 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(regp, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+   write_wd33c93_count(regp,cnt);
+   write_wd33c93_cmd(regp, WD_CMD_TRANS_INFO);
+   if (data_in_dir) {
+      do {
+         asr = READ_AUX_STAT();
+         if (asr & ASR_DBR)
+            *buf++ = read_wd33c93(regp, WD_DATA);
+         } while (!(asr & ASR_INT));
+      }
+   else {
+      do {
+         asr = READ_AUX_STAT();
+         if (asr & ASR_DBR)
+            write_wd33c93(regp, 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.
+   */
+
+}
+
+
+
+void transfer_bytes(wd33c93_regs *regp, Scsi_Cmnd *cmd, int data_in_dir)
+{
+struct WD33C93_hostdata *hostdata;
+
+   hostdata = (struct WD33C93_hostdata *)cmd->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 (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
+      ++cmd->SCp.buffer;
+      --cmd->SCp.buffers_residual;
+      cmd->SCp.this_residual = cmd->SCp.buffer->length;
+      cmd->SCp.ptr = cmd->SCp.buffer->address;
+      }
+
+   write_wd33c93(regp,WD_SYNCHRONOUS_TRANSFER,hostdata->sync_xfer[cmd->target]);
+
+/* 'dma_setup()' will return TRUE if we can't do DMA. */
+
+   if (hostdata->dma_setup(cmd, data_in_dir)) {
+      transfer_pio(regp, (uchar *)&cmd->SCp.ptr, cmd->SCp.this_residual,
+                         data_in_dir, hostdata);
+      }
+
+/* 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 {
+      write_wd33c93(regp, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_DMA);
+      write_wd33c93_count(regp,cmd->SCp.this_residual);
+
+      if ((hostdata->level2 >= L2_DATA) || (cmd->SCp.phase == 0)) {
+         write_wd33c93(regp, WD_COMMAND_PHASE, 0x45);
+         write_wd33c93_cmd(regp, WD_CMD_SEL_ATN_XFER);
+         hostdata->state = S_RUNNING_LEVEL2;
+         }
+      else
+         write_wd33c93_cmd(regp, WD_CMD_TRANS_INFO);
+
+      hostdata->dma = D_DMA_RUNNING;
+      }
+}
+
+
+
+void wd33c93_intr (struct Scsi_Host *instance)
+{
+struct WD33C93_hostdata *hostdata;
+Scsi_Cmnd *patch, *cmd;
+wd33c93_regs *regp;
+unsigned long flags;
+uchar asr, sr, phs, id, lun, *ucp, msg;
+unsigned long length;
+
+
+   hostdata = (struct WD33C93_hostdata *)instance->hostdata;
+   regp = hostdata->regp;
+
+   asr = READ_AUX_STAT();
+   if (!(asr & ASR_INT) || (asr & ASR_BSY))
+      return;
+
+/* OK - it should be safe to re-enable system interrupts */
+
+   save_flags(flags);
+   sti();
+
+   cmd = (Scsi_Cmnd *)hostdata->connected;   /* assume we're connected */
+   sr = read_wd33c93(regp, WD_SCSI_STATUS);  /* clear the interrupt */
+   phs = read_wd33c93(regp, 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:",cmd->SCp.ptr,cmd->SCp.this_residual))
+      hostdata->dma_stop(cmd->host, cmd, 1);
+      hostdata->dma = D_DMA_OFF;
+      length = cmd->SCp.this_residual;
+      cmd->SCp.this_residual = read_wd33c93_count(regp);
+      cmd->SCp.ptr += (length - cmd->SCp.this_residual);
+DB(DB_TRANSFER,printk("%p/%d]",cmd->SCp.ptr,cmd->SCp.this_residual))
+      }
+
+/* Respond to the specific WD3393 interrupt - there are quite a few! */
+
+   switch (sr) {
+
+      case CSR_TIMEOUT:
+DB(DB_INTR,printk("TIMEOUT"))
+
+         cli();
+         if (hostdata->state == S_RUNNING_LEVEL2)
+            hostdata->connected = NULL;
+         else {
+            cmd = (Scsi_Cmnd *)hostdata->selecting;   /* get a valid cmd */
+            hostdata->selecting = NULL;
+            }
+
+         cmd->result = DID_NO_CONNECT << 16;
+         hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+         hostdata->state = S_UNCONNECTED;
+         cmd->scsi_done(cmd);
+
+/* We are not connected to a target - check to see if there
+ * are commands waiting to be executed.
+ */
+
+         sti();
+         wd33c93_execute(instance);
+         break;
+
+
+/* Note: this interrupt should not occur in a LEVEL2 command */
+
+      case CSR_SELECT:
+         cli();
+DB(DB_INTR,printk("SELECT"))
+         hostdata->connected = cmd = (Scsi_Cmnd *)hostdata->selecting;
+         hostdata->selecting = NULL;
+
+      /* construct an IDENTIFY message with correct disconnect bit */
+
+         hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->lun);
+         if (cmd->SCp.phase)
+            hostdata->outgoing_msg[0] |= 0x40;
+
+         if (hostdata->sync_stat[cmd->target] == SS_FIRST) {
+#ifdef SYNC_DEBUG
+printk(" sending SDTR ");
+#endif
+
+            hostdata->sync_stat[cmd->target] = SS_WAITING;
+
+      /* tack on a 2nd message to ask about synchronous transfers */
+
+            hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
+            hostdata->outgoing_msg[2] = 3;
+            hostdata->outgoing_msg[3] = EXTENDED_SDTR;
+            hostdata->outgoing_msg[4] = OPTIMUM_SX_PER/4;
+            hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF;
+            hostdata->outgoing_len = 6;
+            }
+         else
+            hostdata->outgoing_len = 1;
+
+         hostdata->state = S_CONNECTED;
+         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",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
+         transfer_bytes(regp, cmd, DATA_IN_DIR);
+         if (hostdata->state != S_RUNNING_LEVEL2)
+            hostdata->state = S_CONNECTED;
+         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",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
+         transfer_bytes(regp, cmd, DATA_OUT_DIR);
+         if (hostdata->state != S_RUNNING_LEVEL2)
+            hostdata->state = S_CONNECTED;
+         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,%ld",cmd->cmnd[0],cmd->pid))
+         transfer_pio(regp, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, hostdata);
+         hostdata->state = S_CONNECTED;
+         break;
+
+
+      case CSR_XFER_DONE|PHS_STATUS:
+      case CSR_UNEXP    |PHS_STATUS:
+      case CSR_SRV_REQ  |PHS_STATUS:
+DB(DB_INTR,printk("STATUS"))
+
+         cmd->SCp.Status = read_1_byte(regp);
+         if (hostdata->level2 >= L2_BASIC) {
+            sr = read_wd33c93(regp, WD_SCSI_STATUS);  /* clear interrupt */
+            hostdata->state = S_RUNNING_LEVEL2;
+            write_wd33c93(regp, WD_COMMAND_PHASE, 0x50);
+            write_wd33c93_cmd(regp, WD_CMD_SEL_ATN_XFER);
+            }
+         else {
+DB(DB_INTR,printk("=%02x",cmd->SCp.Status))
+            hostdata->state = S_CONNECTED;
+            }
+         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="))
+
+         cli();
+         msg = read_1_byte(regp);
+         sr = read_wd33c93(regp, WD_SCSI_STATUS);  /* clear interrupt */
+
+         hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
+         if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
+            msg = EXTENDED_MESSAGE;
+         else
+            hostdata->incoming_ptr = 0;
+
+         cmd->SCp.Message = msg;
+         switch (msg) {
+
+            case COMMAND_COMPLETE:
+DB(DB_INTR,printk("CCMP-%ld",cmd->pid))
+               write_wd33c93_cmd(regp,WD_CMD_NEGATE_ACK);
+               hostdata->state = S_PRE_CMP_DISC;
+               break;
+
+            case SAVE_POINTERS:
+DB(DB_INTR,printk("SDP"))
+               write_wd33c93_cmd(regp,WD_CMD_NEGATE_ACK);
+               hostdata->state = S_CONNECTED;
+               break;
+
+            case RESTORE_POINTERS:
+DB(DB_INTR,printk("RDP"))
+               if (hostdata->level2 >= L2_BASIC) {
+                  write_wd33c93(regp, WD_COMMAND_PHASE, 0x45);
+                  write_wd33c93_cmd(regp, WD_CMD_SEL_ATN_XFER);
+                  hostdata->state = S_RUNNING_LEVEL2;
+                  }
+               else {
+                  write_wd33c93_cmd(regp, WD_CMD_NEGATE_ACK);
+                  hostdata->state = S_CONNECTED;
+                  }
+               break;
+
+            case DISCONNECT:
+DB(DB_INTR,printk("DIS"))
+               cmd->device->disconnect = 1;
+               write_wd33c93_cmd(regp,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->target] == SS_WAITING)
+                  hostdata->sync_stat[cmd->target] = SS_SET;
+               write_wd33c93_cmd(regp,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:
+                        id = calc_sync_xfer(ucp[3],ucp[4]);
+                        if (hostdata->sync_stat[cmd->target] != 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(regp,WD_CMD_ASSERT_ATN); /* want MESS_OUT */
+                           hostdata->outgoing_msg[0] = EXTENDED_MESSAGE;
+                           hostdata->outgoing_msg[1] = 3;
+                           hostdata->outgoing_msg[2] = EXTENDED_SDTR;
+                           hostdata->outgoing_msg[3] = hostdata->default_sx_per/4;
+                           hostdata->outgoing_msg[4] = 0;
+                           hostdata->outgoing_len = 5;
+                           hostdata->sync_xfer[cmd->target] =
+                                       calc_sync_xfer(hostdata->default_sx_per/4,0);
+                           }
+                        else {
+                           hostdata->sync_xfer[cmd->target] = id;
+                           }
+#ifdef SYNC_DEBUG
+printk("sync_xfer=%02x",hostdata->sync_xfer[cmd->target]);
+#endif
+                        hostdata->sync_stat[cmd->target] = SS_SET;
+                        write_wd33c93_cmd(regp,WD_CMD_NEGATE_ACK);
+                        hostdata->state = S_CONNECTED;
+                        break;
+                     case EXTENDED_WDTR:
+                        write_wd33c93_cmd(regp,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(regp,WD_CMD_NEGATE_ACK);
+                        hostdata->state = S_CONNECTED;
+                        break;
+                     default:
+                        write_wd33c93_cmd(regp,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(regp,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(regp,WD_CMD_NEGATE_ACK);
+                  hostdata->state = S_CONNECTED;
+                  }
+               break;
+
+            default:
+               printk("Rejecting Unknown Message(%02x) ",msg);
+               write_wd33c93_cmd(regp,WD_CMD_ASSERT_ATN); /* want MESS_OUT */
+               hostdata->outgoing_msg[0] = MESSAGE_REJECT;
+               hostdata->outgoing_len = 1;
+               write_wd33c93_cmd(regp,WD_CMD_NEGATE_ACK);
+               hostdata->state = S_CONNECTED;
+            }
+         break;
+
+
+/* Note: this interrupt will occur only after a LEVEL2 command */
+
+      case CSR_SEL_XFER_DONE:
+         cli();
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+         write_wd33c93(regp,WD_SOURCE_ID, SRCID_ER);
+         if (phs == 0x60) {
+DB(DB_INTR,printk("SX-DONE-%ld",cmd->pid))
+            cmd->SCp.Message = COMMAND_COMPLETE;
+            lun = read_wd33c93(regp, WD_TARGET_LUN);
+            if (cmd->SCp.Status == GOOD)
+               cmd->SCp.Status = lun;
+            hostdata->connected = NULL;
+            if (cmd->cmnd[0] != REQUEST_SENSE)
+               cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+            else if (cmd->SCp.Status != GOOD)
+               cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
+            hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+            hostdata->state = S_UNCONNECTED;
+            cmd->scsi_done(cmd);
+
+/* We are no longer  connected to a target - check to see if
+ * there are commands waiting to be executed.
+ */
+
+            wd33c93_execute(instance);
+            }
+         else {
+            printk("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",asr,sr,phs,cmd->pid);
+            }
+         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(regp, WD_COMMAND_PHASE, 0x41);
+            write_wd33c93_cmd(regp, WD_CMD_SEL_ATN_XFER);
+         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(regp, 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;
+         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.
+ */
+
+         cli();
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+         write_wd33c93(regp,WD_SOURCE_ID, SRCID_ER);
+         if (cmd == NULL) {
+            printk(" - Already disconnected! ");
+            hostdata->state = S_UNCONNECTED;
+            return;
+            }
+DB(DB_INTR,printk("UNEXP_DISC-%ld",cmd->pid))
+         hostdata->connected = NULL;
+         hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+         hostdata->state = S_UNCONNECTED;
+         if (cmd->cmnd[0] != REQUEST_SENSE)
+            cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+         else if (cmd->SCp.Status != GOOD)
+            cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
+         cmd->scsi_done(cmd);
+
+/* We are no longer connected to a target - check to see if
+ * there are commands waiting to be executed.
+ */
+
+         wd33c93_execute(instance);
+         break;
+
+
+      case CSR_DISC:
+         cli();
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+         write_wd33c93(regp,WD_SOURCE_ID, SRCID_ER);
+DB(DB_INTR,printk("DISC-%ld",cmd->pid))
+         if (cmd == NULL) {
+            printk(" - Already disconnected! ");
+            hostdata->state = S_UNCONNECTED;
+            }
+         switch (hostdata->state) {
+            case S_PRE_CMP_DISC:
+               hostdata->connected = NULL;
+               hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+               hostdata->state = S_UNCONNECTED;
+               if (cmd->cmnd[0] != REQUEST_SENSE)
+                  cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+               else if (cmd->SCp.Status != GOOD)
+                  cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
+               cmd->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_INTERFACE
+               disc_taken_total++;
+#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.
+ */
+
+         wd33c93_execute(instance);
+         break;
+
+
+      case CSR_RESEL_AM:
+DB(DB_INTR,printk("RESEL"))
+
+         cli();
+
+   /* 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 = (Scsi_Cmnd *)hostdata->selecting;
+               hostdata->selecting = NULL;
+               hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+               cmd->host_scribble = (uchar *)hostdata->input_Q;
+               hostdata->input_Q = cmd;
+               }
+            }
+
+         else {
+
+            if (cmd) {
+               if (phs == 0x00) {
+                  hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+                  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(regp, 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...)
+    */
+
+         lun = read_wd33c93(regp, WD_DATA);
+         if (hostdata->level2 < L2_RESELECT)
+            write_wd33c93_cmd(regp,WD_CMD_NEGATE_ACK);
+         lun &= 7;
+
+   /* Now we look for the command that's reconnecting. */
+
+         cmd = (Scsi_Cmnd *)hostdata->disconnected_Q;
+         patch = NULL;
+         while (cmd) {
+            if (id == cmd->target && lun == cmd->lun)
+               break;
+            patch = cmd;
+            cmd = (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,lun);
+            return;
+            }
+
+   /* Ok, found the command - now start it up again. */
+
+         if (patch)
+            patch->host_scribble = cmd->host_scribble;
+         else
+            hostdata->disconnected_Q = (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 (IS_DIR_OUT(cmd))
+            write_wd33c93(regp, WD_DESTINATION_ID, cmd->target);
+         else
+            write_wd33c93(regp, WD_DESTINATION_ID, cmd->target | DSTID_DPD);
+         if (hostdata->level2 >= L2_RESELECT) {
+            write_wd33c93_count(regp, 0);  /* we want a DATA_PHASE interrupt */
+            write_wd33c93(regp, WD_COMMAND_PHASE, 0x45);
+            write_wd33c93_cmd(regp, WD_CMD_SEL_ATN_XFER);
+            hostdata->state = S_RUNNING_LEVEL2;
+            }
+         else
+            hostdata->state = S_CONNECTED;
+
+DB(DB_INTR,printk("-%ld",cmd->pid))
+         break;
+         
+      default:
+         printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--",asr,sr,phs);
+      }
+
+   restore_flags(flags);
+
+DB(DB_INTR,printk("} "))
+
+}
+
+
+
+void reset_wd33c93(struct Scsi_Host *instance)
+{
+struct WD33C93_hostdata *hostdata;
+wd33c93_regs *regp;
+uchar sr;
+
+   hostdata = (struct WD33C93_hostdata *)instance->hostdata;
+   regp = hostdata->regp;
+
+   write_wd33c93(regp, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
+                 instance->this_id | hostdata->clock_freq);
+   write_wd33c93(regp, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+   write_wd33c93(regp, WD_SYNCHRONOUS_TRANSFER,
+                 calc_sync_xfer(hostdata->default_sx_per/4,DEFAULT_SX_OFF));
+   write_wd33c93(regp, WD_COMMAND, WD_CMD_RESET);
+
+   while (!(READ_AUX_STAT() & ASR_INT))
+      ;
+   sr = read_wd33c93(regp, WD_SCSI_STATUS);
+
+   hostdata->microcode = read_wd33c93(regp, WD_CDB_1);
+   if (sr == 0x00)
+      hostdata->chip = C_WD33C93;
+   else if (sr == 0x01) {
+      write_wd33c93(regp, WD_QUEUE_TAG, 0xa5);  /* any random number */
+      sr = read_wd33c93(regp, WD_QUEUE_TAG);
+      if (sr == 0xa5) {
+         hostdata->chip = C_WD33C93B;
+         write_wd33c93(regp, WD_QUEUE_TAG, 0);
+         }
+      else
+         hostdata->chip = C_WD33C93A;
+      }
+   else
+      hostdata->chip = C_UNKNOWN_CHIP;
+
+   write_wd33c93(regp, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
+   write_wd33c93(regp, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+}
+
+
+
+#if LINUX_VERSION_CODE >= 0x010300
+int wd33c93_reset(Scsi_Cmnd *SCpnt, unsigned int reset_flags)
+#else
+int wd33c93_reset(Scsi_Cmnd *SCpnt)
+#endif
+{
+unsigned long flags;
+struct Scsi_Host *instance;
+struct WD33C93_hostdata *hostdata;
+int i;
+
+   instance = SCpnt->host;
+   hostdata = (struct WD33C93_hostdata *)instance->hostdata;
+
+   printk("scsi%d: reset. ", instance->host_no);
+   save_flags(flags);
+   cli();
+
+   ((struct WD33C93_hostdata *)instance->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);
+      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;
+   restore_flags(flags);
+   return 0;
+}
+
+
+
+int wd33c93_abort (Scsi_Cmnd *cmd)
+{
+struct Scsi_Host *instance;
+struct WD33C93_hostdata *hostdata;
+wd33c93_regs *regp;
+Scsi_Cmnd *tmp, *prev;
+unsigned long flags;
+
+   save_flags (flags);
+   cli();
+
+   instance = cmd->host;
+   hostdata = (struct WD33C93_hostdata *)instance->hostdata;
+   regp = hostdata->regp;
+
+/*
+ * Case 1 : If the command hasn't been issued yet, we simply remove it
+ *     from the input_Q.
+ */
+
+   tmp = (Scsi_Cmnd *)hostdata->input_Q;
+   prev = 0;
+   while (tmp) {
+      if (tmp == cmd) {
+         if (prev)
+            prev->host_scribble = cmd->host_scribble;
+         cmd->host_scribble = NULL;
+         cmd->result = DID_ABORT << 16;
+         printk("scsi%d: Abort - removing command %ld from input_Q. ",
+           instance->host_no, cmd->pid);
+         cmd->scsi_done(cmd);
+         restore_flags(flags);
+         return SCSI_ABORT_SUCCESS;
+         }
+      prev = tmp;
+      tmp = (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 %ld - ",
+              instance->host_no, cmd->pid);
+
+      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(regp, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+      write_wd33c93_cmd(regp, WD_CMD_ABORT);
+
+/* Now we have to attempt to flush out the FIFO... */
+
+      printk("flushing fifo - ");
+      timeout = 1000000;
+      do {
+         asr = READ_AUX_STAT();
+         if (asr & ASR_DBR)
+            read_wd33c93(regp, WD_DATA);
+         } while (!(asr & ASR_INT) && timeout-- > 0);
+      sr = read_wd33c93(regp, WD_SCSI_STATUS);
+      printk("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
+             asr, sr, read_wd33c93_count(regp), timeout);
+
+   /*
+    * Abort command processed.
+    * Still connected.
+    * We must disconnect.
+    */
+
+      printk("sending wd33c93 DISCONNECT command - ");
+      write_wd33c93_cmd(regp, WD_CMD_DISCONNECT);
+
+      timeout = 1000000;
+      asr = READ_AUX_STAT();
+      while ((asr & ASR_CIP) && timeout-- > 0)
+         asr = READ_AUX_STAT();
+      sr = read_wd33c93(regp, WD_SCSI_STATUS);
+      printk("asr=%02x, sr=%02x.",asr,sr);
+
+      hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+      hostdata->connected = NULL;
+      hostdata->state = S_UNCONNECTED;
+      cmd->result = DID_ABORT << 16;
+      cmd->scsi_done(cmd);
+
+/*      sti();*/
+      wd33c93_execute (instance);
+
+      restore_flags(flags);
+      return SCSI_ABORT_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 = (Scsi_Cmnd *)hostdata->disconnected_Q;
+   while (tmp) {
+      if (tmp == cmd) {
+         printk("scsi%d: Abort - command %ld found on disconnected_Q - ",
+                 instance->host_no, cmd->pid);
+         printk("returning ABORT_SNOOZE. ");
+         restore_flags(flags);
+         return SCSI_ABORT_SNOOZE;
+         }
+      tmp = (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);
+
+   restore_flags(flags);
+   printk("scsi%d: warning : SCSI command probably completed successfully"
+      "         before abortion. ", instance->host_no);
+   return SCSI_ABORT_NOT_RUNNING;
+}
+
+
+
+#define MAX_WD33C93_HOSTS 4
+#define MAX_SETUP_STRINGS (sizeof(setup_strings) / sizeof(char *))
+#define SETUP_BUFFER_SIZE 200
+static char setup_buffer[SETUP_BUFFER_SIZE];
+static char setup_used[MAX_SETUP_STRINGS];
+
+void wd33c93_setup (char *str, int *ints)
+{
+int i,x;
+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 (ints[0]) {
+      for (i=0; i<ints[0]; i++) {
+         x = vsprintf(p1,"nosync:0x%02x,",&(ints[i+1]));
+         p1 += x;
+         }
+      }
+   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_STRINGS)) {
+      p2 = strchr(p1, ',');
+      if (p2) {
+         *p2 = '\0';
+         if (p1 != p2)
+            setup_strings[i] = p1;
+         p1 = p2 + 1;
+         i++;
+         }
+      else {
+         setup_strings[i] = p1;
+         break;
+         }
+      }
+   for (i=0; i<MAX_SETUP_STRINGS; i++)
+      setup_used[i] = 0;
+}
+
+
+/* check_setup_strings() returns index if key found, 0 if not
+ */
+
+int check_setup_strings(char *key, int *flags, int *val, char *buf)
+{
+int x;
+char *cp;
+
+   for  (x=0; x<MAX_SETUP_STRINGS; x++) {
+      if (setup_used[x])
+         continue;
+      if (!strncmp(setup_strings[x], key, strlen(key)))
+         break;
+      if (!strncmp(setup_strings[x], "next", strlen("next")))
+         return 0;
+      }
+   if (x == MAX_SETUP_STRINGS)
+      return 0;
+   setup_used[x] = 1;
+   cp = setup_strings[x] + strlen(key);
+   *val = -1;
+   if (*cp != ':')
+      return ++x;
+   cp++;
+   if ((*cp >= '0') && (*cp <= '9')) {
+      *val = simple_strtoul(cp,NULL,0);
+      }
+   return ++x;
+}
+
+
+
+void wd33c93_init (struct Scsi_Host *instance, 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];
+
+   hostdata = (struct WD33C93_hostdata *)instance->hostdata;
+
+   hostdata->regp = regs;
+   hostdata->clock_freq = clock_freq;
+   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);
+      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->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_sync = 0xff;     /* sync defaults to off */
+
+#ifdef PROC_INTERFACE
+   hostdata->proc = PR_VERSION|PR_INFO|PR_TOTALS|
+                    PR_CONNECTED|PR_INPUTQ|PR_DISCQ|
+                    PR_STOP;
+
+   disc_allowed_total = 0;
+   disc_taken_total = 0;
+#endif
+
+
+   if (check_setup_strings("nosync",&flags,&val,buf))
+      hostdata->no_sync = val;
+
+   if (check_setup_strings("period",&flags,&val,buf))
+      hostdata->default_sx_per = sx_table[round_period((unsigned int)val)].period_ns;
+
+   if (check_setup_strings("disconnect",&flags,&val,buf)) {
+      if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
+         hostdata->disconnect = val;
+      else
+         hostdata->disconnect = DIS_ADAPTIVE;
+      }
+
+   if (check_setup_strings("debug",&flags,&val,buf))
+      hostdata->args = val & DB_MASK;
+
+   if (check_setup_strings("clock",&flags,&val,buf)) {
+      if (val>7 && val<11)
+         val = WD33C93_FS_8_10;
+      else if (val>11 && val<16)
+         val = WD33C93_FS_12_15;
+      else if (val>15 && val<21)
+         val = WD33C93_FS_16_20;
+      else
+         val = WD33C93_FS_8_10;
+      hostdata->clock_freq = val;
+      }
+
+   if ((i = check_setup_strings("next",&flags,&val,buf))) {
+      while (i)
+         setup_used[--i] = 1;
+      }
+
+#ifdef PROC_INTERFACE
+   if (check_setup_strings("proc",&flags,&val,buf))
+      hostdata->proc = val;
+#endif
+
+
+   cli();
+   reset_wd33c93(instance);
+   sti();
+
+   printk("wd33c93-%d: chip=%s microcode=%02x\n",instance->host_no,
+         (hostdata->chip==C_WD33C93)?"WD33c93":
+         (hostdata->chip==C_WD33C93A)?"WD33c93A":
+         (hostdata->chip==C_WD33C93B)?"WD33c93B":"unknown",
+         hostdata->microcode);
+
+#ifdef DEBUGGING_ON
+   printk("wd33c93-%d: setup_strings=",instance->host_no);
+   for (i=0; i<MAX_SETUP_STRINGS; i++)
+      printk("%s,",setup_strings[i]);
+   printk("\n");
+   printk("wd33c93-%d: debug_flags = %04x\n",instance->host_no,hostdata->args);
+#endif
+   printk("wd33c93-%d: driver version %s - %s\n",instance->host_no,
+                     WD33C93_VERSION,WD33C93_DATE);
+   printk("wd33c93-%d: compiled on %s at %s\n",instance->host_no,
+                     __DATE__,__TIME__);
+}
+
+
+int wd33c93_proc_info(char *buf, char **start, off_t off, int len, int hn, int in)
+{
+
+#ifdef PROC_INTERFACE
+
+char *bp;
+char tbuf[128];
+unsigned long flags;
+struct Scsi_Host *instance;
+struct WD33C93_hostdata *hd;
+Scsi_Cmnd *cmd;
+int x,i;
+static int stop = 0;
+
+   for (instance=instance_list; instance; instance=instance->next) {
+      if (instance->host_no == hn)
+         break;
+      }
+   if (!instance) {
+      printk("*** Hmm... Can't find host #%d!\n",hn);
+      return (-ESRCH);
+      }
+   hd = (struct WD33C93_hostdata *)instance->hostdata;
+
+/* If 'in' is TRUE we need to _read_ the proc file. We accept the following
+ * keywords (same format as command-line, but only ONE per read):
+ *    debug
+ *    disconnect
+ *    period
+ *    resync
+ *    proc
+ */
+
+   if (in) {
+      buf[len] = '\0';
+      bp = buf;
+      if (!strncmp(bp,"debug:",6)) {
+         bp += 6;
+         hd->args = simple_strtoul(bp,NULL,0) & DB_MASK;
+         }
+      else if (!strncmp(bp,"disconnect:",11)) {
+         bp += 11;
+         x = simple_strtoul(bp,NULL,0);
+         if (x < DIS_NEVER || x > DIS_ALWAYS)
+            x = DIS_ADAPTIVE;
+         hd->disconnect = x;
+         }
+      else if (!strncmp(bp,"period:",7)) {
+         bp += 7;
+         x = simple_strtoul(bp,NULL,0);
+         hd->default_sx_per = sx_table[round_period((unsigned int)x)].period_ns;
+         }
+      else if (!strncmp(bp,"resync:",7)) {
+         bp += 7;
+         x = simple_strtoul(bp,NULL,0);
+         for (i=0; i<7; i++)
+            if (x & (1<<i))
+               hd->sync_stat[i] = SS_UNSET;
+         }
+      else if (!strncmp(bp,"proc:",5)) {
+         bp += 5;
+         hd->proc = simple_strtoul(bp,NULL,0);
+         }
+      return len;
+      }
+
+   save_flags(flags);
+   cli();
+   bp = buf;
+   *bp = '\0';
+   if (hd->proc & PR_VERSION) {
+      sprintf(tbuf,"\nVersion %s - %s. Compiled %s %s",
+            WD33C93_VERSION,WD33C93_DATE,__DATE__,__TIME__);
+      strcat(bp,tbuf);
+      }
+   if (hd->proc & PR_INFO) {
+      ;
+      }
+   if (hd->proc & PR_TOTALS) {
+      sprintf(tbuf,"\n%ld disc_allowed, %ld disc_taken",
+            disc_allowed_total,disc_taken_total);
+      strcat(bp,tbuf);
+      }
+   if (hd->proc & PR_CONNECTED) {
+      strcat(bp,"\nconnected:     ");
+      if (hd->connected) {
+         cmd = (Scsi_Cmnd *)hd->connected;
+         sprintf(tbuf," %ld-%d:%d(%02x)",
+               cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
+         strcat(bp,tbuf);
+         }
+      }
+   if (hd->proc & PR_INPUTQ) {
+      strcat(bp,"\ninput_Q:       ");
+      cmd = (Scsi_Cmnd *)hd->input_Q;
+      while (cmd) {
+         sprintf(tbuf," %ld-%d:%d(%02x)",
+               cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
+         strcat(bp,tbuf);
+         cmd = (Scsi_Cmnd *)cmd->host_scribble;
+         }
+      }
+   if (hd->proc & PR_DISCQ) {
+      strcat(bp,"\ndisconnected_Q:");
+      cmd = (Scsi_Cmnd *)hd->disconnected_Q;
+      while (cmd) {
+         sprintf(tbuf," %ld-%d:%d(%02x)",
+               cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
+         strcat(bp,tbuf);
+         cmd = (Scsi_Cmnd *)cmd->host_scribble;
+         }
+      }
+   strcat(bp,"\n");
+   restore_flags(flags);
+   *start = buf;
+   if (stop) {
+      stop = 0;
+      return 0;
+      }
+   if (off > 0x40000)   /* ALWAYS stop after 256k bytes have been read */
+      stop = 1;;
+   if (hd->proc & PR_STOP)    /* stop every other time */
+      stop = 1;
+   return strlen(bp);
+
+#else    /* PROC_INTERFACE */
+
+   return 0;
+
+#endif   /* PROC_INTERFACE */
+
+}
+
+
+#ifdef MODULE
+
+Scsi_Host_Template driver_template = WD33C93;
+
+#include "scsi_module.c"
+
+#endif
+