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 // 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);
 
 #ifdef CONFIG_WD33C93_PIO
 static inline uchar
 read_wd33c93(const wd33c93_regs regs, uchar reg_num)
 {
     uchar data;
 
     outb(reg_num, regs.SASR);
     data = inb(regs.SCMD);
     return data;
 }
 
 static inline unsigned long
 read_wd33c93_count(const wd33c93_regs regs)
 {
     unsigned long value;
 
     outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
     value = inb(regs.SCMD) << 16;
     value |= inb(regs.SCMD) << 8;
     value |= inb(regs.SCMD);
     return value;
 }
 
 static inline uchar
 read_aux_stat(const wd33c93_regs regs)
 {
     return inb(regs.SASR);
 }
 
 static inline void
 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
 {
       outb(reg_num, regs.SASR);
       outb(value, regs.SCMD);
 }
 
 static inline void
 write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
 {
     outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
     outb((value >> 16) & 0xff, regs.SCMD);
     outb((value >> 8) & 0xff, regs.SCMD);
     outb( value & 0xff, regs.SCMD);
 }
 
 #define write_wd33c93_cmd(regs, cmd) \
     write_wd33c93((regs), WD_COMMAND, (cmd))
 
 static inline void
 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
 {
     int i;
 
     outb(WD_CDB_1, regs.SASR);
     for (i=0; i<len; i++)
         outb(cmnd[i], regs.SCMD);
 }
 
 #else /* CONFIG_WD33C93_PIO */
 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];
 }
 #endif /* CONFIG_WD33C93_PIO */
 
 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);

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