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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/drivers/acorn/scsi/fas216.c
  *
  *  Copyright (C) 1997-2003 Russell King
  *
  * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
  * other sources, including:
  *   the AMD Am53CF94 data sheet
  *   the AMD Am53C94 data sheet
  *
  * This is a generic driver.  To use it, have a look at cumana_2.c.  You
  * should define your own structure that overlays FAS216_Info, eg:
  * struct my_host_data {
  *    FAS216_Info info;
  *    ... my host specific data ...
  * };
  *
  * Changelog:
  *  30-08-1997  RMK Created
  *  14-09-1997  RMK Started disconnect support
  *  08-02-1998  RMK Corrected real DMA support
  *  15-02-1998  RMK Started sync xfer support
  *  06-04-1998  RMK Tightened conditions for printing incomplete
  *          transfers
  *  02-05-1998  RMK Added extra checks in fas216_reset
  *  24-05-1998  RMK Fixed synchronous transfers with period >= 200ns
  *  27-06-1998  RMK Changed asm/delay.h to linux/delay.h
  *  26-08-1998  RMK Improved message support wrt MESSAGE_REJECT
  *  02-04-2000  RMK Converted to use the new error handling, and
  *          automatically request sense data upon check
  *          condition status from targets.
  */
 #include <linux/module.h>
 #include <linux/blkdev.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/ioport.h>
 #include <linux/proc_fs.h>
 #include <linux/delay.h>
 #include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 
 #include <asm/dma.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/ecard.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_dbg.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_tcq.h>
 #include "fas216.h"
 #include "arm_scsi.h"
 
 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to
  *  the data sheet.  This restriction is crazy, especially when
  *  you only want to send 16 bytes!  What were the guys who
  *  designed this chip on at that time?  Did they read the SCSI2
  *  spec at all?  The following sections are taken from the SCSI2
  *  standard (s2r10) concerning this:
  *
  * > IMPLEMENTORS NOTES:
  * >   (1)  Re-negotiation at every selection is not recommended, since a
  * >   significant performance impact is likely.
  *
  * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
  * >  RESET message is received, until a hard reset condition occurs, or until one
  * >  of the two SCSI devices elects to modify the agreement.  The default data
  * >  transfer mode is asynchronous data transfer mode.  The default data transfer
  * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
  * >  reset condition.
  *
  *  In total, this means that once you have elected to use synchronous
  *  transfers, you must always use DMA.
  *
  *  I was thinking that this was a good chip until I found this restriction ;(
  */
 #define SCSI2_SYNC
 
 #undef DEBUG_CONNECT
 #undef DEBUG_MESSAGES
 
 #undef CHECK_STRUCTURE
 
 #define LOG_CONNECT     (1 << 0)
 #define LOG_BUSSERVICE      (1 << 1)
 #define LOG_FUNCTIONDONE    (1 << 2)
 #define LOG_MESSAGES        (1 << 3)
 #define LOG_BUFFER      (1 << 4)
 #define LOG_ERROR       (1 << 8)
 
 static int level_mask = LOG_ERROR;
 
 module_param(level_mask, int, 0644);
 
 #ifndef MODULE
 static int __init fas216_log_setup(char *str)
 {
     char *s;
 
     level_mask = 0;
 
     while ((s = strsep(&str, ",")) != NULL) {
         switch (s[0]) {
         case 'a':
             if (strcmp(s, "all") == 0)
                 level_mask |= -1;
             break;
         case 'b':
             if (strncmp(s, "bus", 3) == 0)
                 level_mask |= LOG_BUSSERVICE;
             if (strncmp(s, "buf", 3) == 0)
                 level_mask |= LOG_BUFFER;
             break;
         case 'c':
             level_mask |= LOG_CONNECT;
             break;
         case 'e':
             level_mask |= LOG_ERROR;
             break;
         case 'm':
             level_mask |= LOG_MESSAGES;
             break;
         case 'n':
             if (strcmp(s, "none") == 0)
                 level_mask = 0;
             break;
         case 's':
             level_mask |= LOG_FUNCTIONDONE;
             break;
         }
     }
     return 1;
 }
 
 __setup("fas216_logging=", fas216_log_setup);
 #endif
 
 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
 {
     unsigned int off = reg << info->scsi.io_shift;
     return readb(info->scsi.io_base + off);
 }
 
 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
 {
     unsigned int off = reg << info->scsi.io_shift;
     writeb(val, info->scsi.io_base + off);
 }
 
 static void fas216_dumpstate(FAS216_Info *info)
 {
     unsigned char is, stat, inst;
 
     is   = fas216_readb(info, REG_IS);
     stat = fas216_readb(info, REG_STAT);
     inst = fas216_readb(info, REG_INST);
     
     printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
            " INST=%02X IS=%02X CFIS=%02X",
         fas216_readb(info, REG_CTCL),
         fas216_readb(info, REG_CTCM),
         fas216_readb(info, REG_CMD),  stat, inst, is,
         fas216_readb(info, REG_CFIS));
     printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
         fas216_readb(info, REG_CNTL1),
         fas216_readb(info, REG_CNTL2),
         fas216_readb(info, REG_CNTL3),
         fas216_readb(info, REG_CTCH));
 }
 
 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
 {
     printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
         prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
         SCp->buffers_residual, suffix);
 }
 
 #ifdef CHECK_STRUCTURE
 static void fas216_dumpinfo(FAS216_Info *info)
 {
     static int used = 0;
     int i;
 
     if (used++)
         return;
 
     printk("FAS216_Info=\n");
     printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
         info->magic_start, info->host, info->SCpnt,
         info->origSCpnt);
     printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
         info->scsi.io_shift, info->scsi.irq,
         info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
         info->scsi.cfg[3]);
     printk("           type=%p phase=%X\n",
         info->scsi.type, info->scsi.phase);
     print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
     printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
         info->scsi.async_stp,
         info->scsi.disconnectable, info->scsi.aborting);
     printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
            "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
         info->stats.queues, info->stats.removes, info->stats.fins,
         info->stats.reads, info->stats.writes, info->stats.miscs,
         info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
         info->stats.host_resets);
     printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
         info->ifcfg.clockrate, info->ifcfg.select_timeout,
         info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
     for (i = 0; i < 8; i++) {
         printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
             i, info->busyluns[i], i,
             info->device[i].disconnect_ok, info->device[i].stp,
             info->device[i].sof, info->device[i].sync_state);
     }
     printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
         info->dma.transfer_type, info->dma.setup,
         info->dma.pseudo, info->dma.stop);
     printk("    internal_done=%X magic_end=%lX }\n",
         info->internal_done, info->magic_end);
 }
 
 static void __fas216_checkmagic(FAS216_Info *info, const char *func)
 {
     int corruption = 0;
     if (info->magic_start != MAGIC) {
         printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
         corruption++;
     }
     if (info->magic_end != MAGIC) {
         printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
         corruption++;
     }
     if (corruption) {
         fas216_dumpinfo(info);
         panic("scsi memory space corrupted in %s", func);
     }
 }
 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
 #else
 #define fas216_checkmagic(info)
 #endif
 
 static const char *fas216_bus_phase(int stat)
 {
     static const char *phases[] = {
         "DATA OUT", "DATA IN",
         "COMMAND", "STATUS",
         "MISC OUT", "MISC IN",
         "MESG OUT", "MESG IN"
     };
 
     return phases[stat & STAT_BUSMASK];
 }
 
 static const char *fas216_drv_phase(FAS216_Info *info)
 {
     static const char *phases[] = {
         [PHASE_IDLE]        = "idle",
         [PHASE_SELECTION]   = "selection",
         [PHASE_COMMAND]     = "command",
         [PHASE_DATAOUT]     = "data out",
         [PHASE_DATAIN]      = "data in",
         [PHASE_MSGIN]       = "message in",
         [PHASE_MSGIN_DISCONNECT]= "disconnect",
         [PHASE_MSGOUT_EXPECT]   = "expect message out",
         [PHASE_MSGOUT]      = "message out",
         [PHASE_STATUS]      = "status",
         [PHASE_DONE]        = "done",
     };
 
     if (info->scsi.phase < ARRAY_SIZE(phases) &&
         phases[info->scsi.phase])
         return phases[info->scsi.phase];
     return "???";
 }
 
 static char fas216_target(FAS216_Info *info)
 {
     if (info->SCpnt)
         return '0' + info->SCpnt->device->id;
     else
         return 'H';
 }
 
 static void
 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
 {
     static char buf[1024];
 
     vsnprintf(buf, sizeof(buf), fmt, ap);
     printk("scsi%d.%c: %s", info->host->host_no, target, buf);
 }
 
 static void fas216_log_command(FAS216_Info *info, int level,
                    struct scsi_cmnd *SCpnt, char *fmt, ...)
 {
     va_list args;
 
     if (level != 0 && !(level & level_mask))
         return;
 
     va_start(args, fmt);
     fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
     va_end(args);
 
     scsi_print_command(SCpnt);
 }
 
 static void
 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
 {
     va_list args;
 
     if (level != 0 && !(level & level_mask))
         return;
 
     if (target < 0)
         target = 'H';
     else
         target += '0';
 
     va_start(args, fmt);
     fas216_do_log(info, target, fmt, args);
     va_end(args);
 
     printk("\n");
 }
 
 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
 {
     va_list args;
 
     if (level != 0 && !(level & level_mask))
         return;
 
     va_start(args, fmt);
     fas216_do_log(info, fas216_target(info), fmt, args);
     va_end(args);
 
     printk("\n");
 }
 
 #define PH_SIZE 32
 
 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
 static int ph_ptr;
 
 static void add_debug_list(int stat, int ssr, int isr, int ph)
 {
     ph_list[ph_ptr].stat = stat;
     ph_list[ph_ptr].ssr = ssr;
     ph_list[ph_ptr].isr = isr;
     ph_list[ph_ptr].ph = ph;
 
     ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
 }
 
 static struct { int command; void *from; } cmd_list[8];
 static int cmd_ptr;
 
 static void fas216_cmd(FAS216_Info *info, unsigned int command)
 {
     cmd_list[cmd_ptr].command = command;
     cmd_list[cmd_ptr].from = __builtin_return_address(0);
 
     cmd_ptr = (cmd_ptr + 1) & 7;
 
     fas216_writeb(info, REG_CMD, command);
 }
 
 static void print_debug_list(void)
 {
     int i;
 
     i = ph_ptr;
 
     printk(KERN_ERR "SCSI IRQ trail\n");
     do {
         printk(" %02x:%02x:%02x:%1x",
             ph_list[i].stat, ph_list[i].ssr,
             ph_list[i].isr, ph_list[i].ph);
         i = (i + 1) & (PH_SIZE - 1);
         if (((i ^ ph_ptr) & 7) == 0)
             printk("\n");
     } while (i != ph_ptr);
     if ((i ^ ph_ptr) & 7)
         printk("\n");
 
     i = cmd_ptr;
     printk(KERN_ERR "FAS216 commands: ");
     do {
         printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
         i = (i + 1) & 7;
     } while (i != cmd_ptr);
     printk("\n");
 }
 
 static void fas216_done(FAS216_Info *info, unsigned int result);
 
 /**
  * fas216_get_last_msg - retrive last message from the list
  * @info: interface to search
  * @pos: current fifo position
  *
  * Retrieve a last message from the list, using position in fifo.
  */
 static inline unsigned short
 fas216_get_last_msg(FAS216_Info *info, int pos)
 {
     unsigned short packed_msg = NOP;
     struct message *msg;
     int msgnr = 0;
 
     while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
         if (pos >= msg->fifo)
             break;
     }
 
     if (msg) {
         if (msg->msg[0] == EXTENDED_MESSAGE)
             packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
         else
             packed_msg = msg->msg[0];
     }
 
     fas216_log(info, LOG_MESSAGES,
         "Message: %04x found at position %02x\n", packed_msg, pos);
 
     return packed_msg;
 }
 
 /**
  * fas216_syncperiod - calculate STP register value
  * @info: state structure for interface connected to device
  * @ns: period in ns (between subsequent bytes)
  *
  * Calculate value to be loaded into the STP register for a given period
  * in ns. Returns a value suitable for REG_STP.
  */
 static int fas216_syncperiod(FAS216_Info *info, int ns)
 {
     int value = (info->ifcfg.clockrate * ns) / 1000;
 
     fas216_checkmagic(info);
 
     if (value < 4)
         value = 4;
     else if (value > 35)
         value = 35;
 
     return value & 31;
 }
 
 /**
  * fas216_set_sync - setup FAS216 chip for specified transfer period.
  * @info: state structure for interface connected to device
  * @target: target
  *
  * Correctly setup FAS216 chip for specified transfer period.
  * Notes   : we need to switch the chip out of FASTSCSI mode if we have
  *           a transfer period >= 200ns - otherwise the chip will violate
  *           the SCSI timings.
  */
 static void fas216_set_sync(FAS216_Info *info, int target)
 {
     unsigned int cntl3;
 
     fas216_writeb(info, REG_SOF, info->device[target].sof);
     fas216_writeb(info, REG_STP, info->device[target].stp);
 
     cntl3 = info->scsi.cfg[2];
     if (info->device[target].period >= (200 / 4))
         cntl3 = cntl3 & ~CNTL3_FASTSCSI;
 
     fas216_writeb(info, REG_CNTL3, cntl3);
 }
 
 /* Synchronous transfer support
  *
  * Note: The SCSI II r10 spec says (5.6.12):
  *
  *  (2)  Due to historical problems with early host adapters that could
  *  not accept an SDTR message, some targets may not initiate synchronous
  *  negotiation after a power cycle as required by this standard.  Host
  *  adapters that support synchronous mode may avoid the ensuing failure
  *  modes when the target is independently power cycled by initiating a
  *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
  *  This approach increases the SCSI bus overhead and is not recommended
  *  for new implementations.  The correct method is to respond to an
  *  SDTR message with a MESSAGE REJECT message if the either the
  *  initiator or target devices does not support synchronous transfers
  *  or does not want to negotiate for synchronous transfers at the time.
  *  Using the correct method assures compatibility with wide data
  *  transfers and future enhancements.
  *
  * We will always initiate a synchronous transfer negotiation request on
  * every INQUIRY or REQUEST SENSE message, unless the target itself has
  * at some point performed a synchronous transfer negotiation request, or
  * we have synchronous transfers disabled for this device.
  */
 
 /**
  * fas216_handlesync - Handle a synchronous transfer message
  * @info: state structure for interface
  * @msg: message from target
  *
  * Handle a synchronous transfer message from the target
  */
 static void fas216_handlesync(FAS216_Info *info, char *msg)
 {
     struct fas216_device *dev = &info->device[info->SCpnt->device->id];
     enum { sync, async, none, reject } res = none;
 
 #ifdef SCSI2_SYNC
     switch (msg[0]) {
     case MESSAGE_REJECT:
         /* Synchronous transfer request failed.
          * Note: SCSI II r10:
          *
          *  SCSI devices that are capable of synchronous
          *  data transfers shall not respond to an SDTR
          *  message with a MESSAGE REJECT message.
          *
          * Hence, if we get this condition, we disable
          * negotiation for this device.
          */
         if (dev->sync_state == neg_inprogress) {
             dev->sync_state = neg_invalid;
             res = async;
         }
         break;
 
     case EXTENDED_MESSAGE:
         switch (dev->sync_state) {
         /* We don't accept synchronous transfer requests.
          * Respond with a MESSAGE_REJECT to prevent a
          * synchronous transfer agreement from being reached.
          */
         case neg_invalid:
             res = reject;
             break;
 
         /* We were not negotiating a synchronous transfer,
          * but the device sent us a negotiation request.
          * Honour the request by sending back a SDTR
          * message containing our capability, limited by
          * the targets capability.
          */
         default:
             fas216_cmd(info, CMD_SETATN);
             if (msg[4] > info->ifcfg.sync_max_depth)
                 msg[4] = info->ifcfg.sync_max_depth;
             if (msg[3] < 1000 / info->ifcfg.clockrate)
                 msg[3] = 1000 / info->ifcfg.clockrate;
 
             msgqueue_flush(&info->scsi.msgs);
             msgqueue_addmsg(&info->scsi.msgs, 5,
                     EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
                     msg[3], msg[4]);
             info->scsi.phase = PHASE_MSGOUT_EXPECT;
 
             /* This is wrong.  The agreement is not in effect
              * until this message is accepted by the device
              */
             dev->sync_state = neg_targcomplete;
             res = sync;
             break;
 
         /* We initiated the synchronous transfer negotiation,
          * and have successfully received a response from the
          * target.  The synchronous transfer agreement has been
          * reached.  Note: if the values returned are out of our
          * bounds, we must reject the message.
          */
         case neg_inprogress:
             res = reject;
             if (msg[4] <= info->ifcfg.sync_max_depth &&
                 msg[3] >= 1000 / info->ifcfg.clockrate) {
                 dev->sync_state = neg_complete;
                 res = sync;
             }
             break;
         }
     }
 #else
     res = reject;
 #endif
 
     switch (res) {
     case sync:
         dev->period = msg[3];
         dev->sof    = msg[4];
         dev->stp    = fas216_syncperiod(info, msg[3] * 4);
         fas216_set_sync(info, info->SCpnt->device->id);
         break;
 
     case reject:
         fas216_cmd(info, CMD_SETATN);
         msgqueue_flush(&info->scsi.msgs);
         msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
         info->scsi.phase = PHASE_MSGOUT_EXPECT;
         fallthrough;
 
     case async:
         dev->period = info->ifcfg.asyncperiod / 4;
         dev->sof    = 0;
         dev->stp    = info->scsi.async_stp;
         fas216_set_sync(info, info->SCpnt->device->id);
         break;
 
     case none:
         break;
     }
 }
 
 /**
  * fas216_updateptrs - update data pointers after transfer suspended/paused
  * @info: interface's local pointer to update
  * @bytes_transferred: number of bytes transferred
  *
  * Update data pointers after transfer suspended/paused
  */
 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
 {
     struct scsi_pointer *SCp = &info->scsi.SCp;
 
     fas216_checkmagic(info);
 
     BUG_ON(bytes_transferred < 0);
 
     SCp->phase -= bytes_transferred;
 
     while (bytes_transferred != 0) {
         if (SCp->this_residual > bytes_transferred)
             break;
         /*
          * We have used up this buffer.  Move on to the
          * next buffer.
          */
         bytes_transferred -= SCp->this_residual;
         if (!next_SCp(SCp) && bytes_transferred) {
             printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
                 info->host->host_no, '0' + info->SCpnt->device->id);
             return;
         }
     }
 
     SCp->this_residual -= bytes_transferred;
     if (SCp->this_residual)
         SCp->ptr += bytes_transferred;
     else
         SCp->ptr = NULL;
 }
 
 /**
  * fas216_pio - transfer data off of/on to card using programmed IO
  * @info: interface to transfer data to/from
  * @direction: direction to transfer data (DMA_OUT/DMA_IN)
  *
  * Transfer data off of/on to card using programmed IO.
  * Notes: this is incredibly slow.
  */
 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
 {
     struct scsi_pointer *SCp = &info->scsi.SCp;
 
     fas216_checkmagic(info);
 
     if (direction == DMA_OUT)
         fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
     else
         put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
 
     if (SCp->this_residual == 0)
         next_SCp(SCp);
 }
 
 static void fas216_set_stc(FAS216_Info *info, unsigned int length)
 {
     fas216_writeb(info, REG_STCL, length);
     fas216_writeb(info, REG_STCM, length >> 8);
     fas216_writeb(info, REG_STCH, length >> 16);
 }
 
 static unsigned int fas216_get_ctc(FAS216_Info *info)
 {
     return fas216_readb(info, REG_CTCL) +
            (fas216_readb(info, REG_CTCM) << 8) +
            (fas216_readb(info, REG_CTCH) << 16);
 }
 
 /**
  * fas216_cleanuptransfer - clean up after a transfer has completed.
  * @info: interface to clean up
  *
  * Update the data pointers according to the number of bytes transferred
  * on the SCSI bus.
  */
 static void fas216_cleanuptransfer(FAS216_Info *info)
 {
     unsigned long total, residual, fifo;
     fasdmatype_t dmatype = info->dma.transfer_type;
 
     info->dma.transfer_type = fasdma_none;
 
     /*
      * PIO transfers do not need to be cleaned up.
      */
     if (dmatype == fasdma_pio || dmatype == fasdma_none)
         return;
 
     if (dmatype == fasdma_real_all)
         total = info->scsi.SCp.phase;
     else
         total = info->scsi.SCp.this_residual;
 
     residual = fas216_get_ctc(info);
 
     fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
 
     fas216_log(info, LOG_BUFFER, "cleaning up from previous "
            "transfer: length 0x%06x, residual 0x%x, fifo %d",
            total, residual, fifo);
 
     /*
      * If we were performing Data-Out, the transfer counter
      * counts down each time a byte is transferred by the
      * host to the FIFO.  This means we must include the
      * bytes left in the FIFO from the transfer counter.
      */
     if (info->scsi.phase == PHASE_DATAOUT)
         residual += fifo;
 
     fas216_updateptrs(info, total - residual);
 }
 
 /**
  * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
  * @info: interface from which device disconnected from
  *
  * Start a DMA/PIO transfer off of/on to card
  */
 static void fas216_transfer(FAS216_Info *info)
 {
     fasdmadir_t direction;
     fasdmatype_t dmatype;
 
     fas216_log(info, LOG_BUFFER,
            "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
            info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
            info->scsi.SCp.phase);
 
     if (!info->scsi.SCp.ptr) {
         fas216_log(info, LOG_ERROR, "null buffer passed to "
                "fas216_starttransfer");
         print_SCp(&info->scsi.SCp, "SCp: ", "\n");
         print_SCp(arm_scsi_pointer(info->SCpnt), "Cmnd SCp: ", "\n");
         return;
     }
 
     /*
      * If we have a synchronous transfer agreement in effect, we must
      * use DMA mode.  If we are using asynchronous transfers, we may
      * use DMA mode or PIO mode.
      */
     if (info->device[info->SCpnt->device->id].sof)
         dmatype = fasdma_real_all;
     else
         dmatype = fasdma_pio;
 
     if (info->scsi.phase == PHASE_DATAOUT)
         direction = DMA_OUT;
     else
         direction = DMA_IN;
 
     if (info->dma.setup)
         dmatype = info->dma.setup(info->host, &info->scsi.SCp,
                       direction, dmatype);
     info->dma.transfer_type = dmatype;
 
     if (dmatype == fasdma_real_all)
         fas216_set_stc(info, info->scsi.SCp.phase);
     else
         fas216_set_stc(info, info->scsi.SCp.this_residual);
 
     switch (dmatype) {
     case fasdma_pio:
         fas216_log(info, LOG_BUFFER, "PIO transfer");
         fas216_writeb(info, REG_SOF, 0);
         fas216_writeb(info, REG_STP, info->scsi.async_stp);
         fas216_cmd(info, CMD_TRANSFERINFO);
         fas216_pio(info, direction);
         break;
 
     case fasdma_pseudo:
         fas216_log(info, LOG_BUFFER, "pseudo transfer");
         fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
         info->dma.pseudo(info->host, &info->scsi.SCp,
                  direction, info->SCpnt->transfersize);
         break;
 
     case fasdma_real_block:
         fas216_log(info, LOG_BUFFER, "block dma transfer");
         fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
         break;
 
     case fasdma_real_all:
         fas216_log(info, LOG_BUFFER, "total dma transfer");
         fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
         break;
 
     default:
         fas216_log(info, LOG_BUFFER | LOG_ERROR,
                "invalid FAS216 DMA type");
         break;
     }
 }
 
 /**
  * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
  * @info: interface from which device disconnected from
  *
  * Called when we switch away from DATA IN or DATA OUT phases.
  */
 static void fas216_stoptransfer(FAS216_Info *info)
 {
     fas216_checkmagic(info);
 
     if (info->dma.transfer_type == fasdma_real_all ||
         info->dma.transfer_type == fasdma_real_block)
         info->dma.stop(info->host, &info->scsi.SCp);
 
     fas216_cleanuptransfer(info);
 
     if (info->scsi.phase == PHASE_DATAIN) {
         unsigned int fifo;
 
         /*
          * If we were performing Data-In, then the FIFO counter
          * contains the number of bytes not transferred via DMA
          * from the on-board FIFO.  Read them manually.
          */
         fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
         while (fifo && info->scsi.SCp.ptr) {
             *info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
             fas216_updateptrs(info, 1);
             fifo--;
         }
     } else {
         /*
          * After a Data-Out phase, there may be unsent
          * bytes left in the FIFO.  Flush them out.
          */
         fas216_cmd(info, CMD_FLUSHFIFO);
     }
 }
 
 static void fas216_aborttransfer(FAS216_Info *info)
 {
     fas216_checkmagic(info);
 
     if (info->dma.transfer_type == fasdma_real_all ||
         info->dma.transfer_type == fasdma_real_block)
         info->dma.stop(info->host, &info->scsi.SCp);
 
     info->dma.transfer_type = fasdma_none;
     fas216_cmd(info, CMD_FLUSHFIFO);
 }
 
 static void fas216_kick(FAS216_Info *info);
 
 /**
  * fas216_disconnected_intr - handle device disconnection
  * @info: interface from which device disconnected from
  *
  * Handle device disconnection
  */
 static void fas216_disconnect_intr(FAS216_Info *info)
 {
     unsigned long flags;
 
     fas216_checkmagic(info);
 
     fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
            info->scsi.phase);
 
     msgqueue_flush(&info->scsi.msgs);
 
     switch (info->scsi.phase) {
     case PHASE_SELECTION:           /* while selecting - no target      */
     case PHASE_SELSTEPS:
         fas216_done(info, DID_NO_CONNECT);
         break;
 
     case PHASE_MSGIN_DISCONNECT:        /* message in - disconnecting       */
         info->scsi.disconnectable = 1;
         info->scsi.phase = PHASE_IDLE;
         info->stats.disconnects += 1;
         spin_lock_irqsave(&info->host_lock, flags);
         if (info->scsi.phase == PHASE_IDLE)
             fas216_kick(info);
         spin_unlock_irqrestore(&info->host_lock, flags);
         break;
 
     case PHASE_DONE:            /* at end of command - complete     */
         fas216_done(info, DID_OK);
         break;
 
     case PHASE_MSGOUT:          /* message out - possible ABORT message */
         if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
             info->scsi.aborting = 0;
             fas216_done(info, DID_ABORT);
             break;
         }
         fallthrough;
 
     default:                /* huh?                 */
         printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
             info->host->host_no, fas216_target(info), fas216_drv_phase(info));
         print_debug_list();
         fas216_stoptransfer(info);
         fas216_done(info, DID_ERROR);
         break;
     }
 }
 
 /**
  * fas216_reselected_intr - start reconnection of a device
  * @info: interface which was reselected
  *
  * Start reconnection of a device
  */
 static void
 fas216_reselected_intr(FAS216_Info *info)
 {
     unsigned int cfis, i;
     unsigned char msg[4];
     unsigned char target, lun, tag;
 
     fas216_checkmagic(info);
 
     WARN_ON(info->scsi.phase == PHASE_SELECTION ||
         info->scsi.phase == PHASE_SELSTEPS);
 
     cfis = fas216_readb(info, REG_CFIS);
 
     fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
            info->scsi.phase, cfis);
 
     cfis &= CFIS_CF;
 
     if (cfis < 2 || cfis > 4) {
         printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
             info->host->host_no);
         goto bad_message;
     }
 
     for (i = 0; i < cfis; i++)
         msg[i] = fas216_readb(info, REG_FF);
 
     if (!(msg[0] & (1 << info->host->this_id)) ||
         !(msg[1] & 0x80))
         goto initiator_error;
 
     target = msg[0] & ~(1 << info->host->this_id);
     target = ffs(target) - 1;
     lun = msg[1] & 7;
     tag = 0;
 
     if (cfis >= 3) {
         if (msg[2] != SIMPLE_QUEUE_TAG)
             goto initiator_error;
 
         tag = msg[3];
     }
 
     /* set up for synchronous transfers */
     fas216_writeb(info, REG_SDID, target);
     fas216_set_sync(info, target);
     msgqueue_flush(&info->scsi.msgs);
 
     fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
            target, lun, tag);
 
     if (info->scsi.disconnectable && info->SCpnt) {
         info->scsi.disconnectable = 0;
         if (info->SCpnt->device->id  == target &&
             info->SCpnt->device->lun == lun &&
             scsi_cmd_to_rq(info->SCpnt)->tag == tag) {
             fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
         } else {
             queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
             fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
             info->SCpnt = NULL;
         }
     }
     if (!info->SCpnt) {
         info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
                     target, lun, tag);
         fas216_log(info, LOG_CONNECT, "had to get command");
     }
 
     if (info->SCpnt) {
         /*
          * Restore data pointer from SAVED data pointer
          */
         info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
 
         fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
             info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
         info->scsi.phase = PHASE_MSGIN;
     } else {
         /*
          * Our command structure not found - abort the
          * command on the target.  Since we have no
          * record of this command, we can't send
          * an INITIATOR DETECTED ERROR message.
          */
         fas216_cmd(info, CMD_SETATN);
 
 #if 0
         if (tag)
             msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
         else
 #endif
             msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
         info->scsi.phase = PHASE_MSGOUT_EXPECT;
         info->scsi.aborting = 1;
     }
 
     fas216_cmd(info, CMD_MSGACCEPTED);
     return;
 
  initiator_error:
     printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
         info->host->host_no);
     for (i = 0; i < cfis; i++)
         printk(" %02x", msg[i]);
     printk("\n");
  bad_message:
     fas216_cmd(info, CMD_SETATN);
     msgqueue_flush(&info->scsi.msgs);
     msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
     info->scsi.phase = PHASE_MSGOUT_EXPECT;
     fas216_cmd(info, CMD_MSGACCEPTED);
 }
 
 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
 {
     struct scsi_pointer *scsi_pointer;
     int i;
 
     switch (message[0]) {
     case COMMAND_COMPLETE:
         if (msglen != 1)
             goto unrecognised;
 
         printk(KERN_ERR "scsi%d.%c: command complete with no "
             "status in MESSAGE_IN?\n",
             info->host->host_no, fas216_target(info));
         break;
 
     case SAVE_POINTERS:
         if (msglen != 1)
             goto unrecognised;
 
         /*
          * Save current data pointer to SAVED data pointer
          * SCSI II standard says that we must not acknowledge
          * this until we have really saved pointers.
          * NOTE: we DO NOT save the command nor status pointers
          * as required by the SCSI II standard.  These always
          * point to the start of their respective areas.
          */
         scsi_pointer = arm_scsi_pointer(info->SCpnt);
         *scsi_pointer = info->scsi.SCp;
         scsi_pointer->sent_command = 0;
         fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
             "save data pointers: [%p, %X]",
             info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
         break;
 
     case RESTORE_POINTERS:
         if (msglen != 1)
             goto unrecognised;
 
         /*
          * Restore current data pointer from SAVED data pointer
          */
         info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
         fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
             "restore data pointers: [%p, 0x%x]",
             info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
         break;
 
     case DISCONNECT:
         if (msglen != 1)
             goto unrecognised;
 
         info->scsi.phase = PHASE_MSGIN_DISCONNECT;
         break;
 
     case MESSAGE_REJECT:
         if (msglen != 1)
             goto unrecognised;
 
         switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
         case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
             fas216_handlesync(info, message);
             break;
 
         default:
             fas216_log(info, 0, "reject, last message 0x%04x",
                 fas216_get_last_msg(info, info->scsi.msgin_fifo));
         }
         break;
 
     case NOP:
         break;
 
     case EXTENDED_MESSAGE:
         if (msglen < 3)
             goto unrecognised;
 
         switch (message[2]) {
         case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */
             fas216_handlesync(info, message);
             break;
 
         default:
             goto unrecognised;
         }
         break;
 
     default:
         goto unrecognised;
     }
     return;
 
 unrecognised:
     fas216_log(info, 0, "unrecognised message, rejecting");
     printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
     for (i = 0; i < msglen; i++)
         printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
     printk("\n");
 
     /*
      * Something strange seems to be happening here -
      * I can't use SETATN since the chip gives me an
      * invalid command interrupt when I do.  Weird.
      */
 fas216_cmd(info, CMD_NOP);
 fas216_dumpstate(info);
     fas216_cmd(info, CMD_SETATN);
     msgqueue_flush(&info->scsi.msgs);
     msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
     info->scsi.phase = PHASE_MSGOUT_EXPECT;
 fas216_dumpstate(info);
 }
 
 static int fas216_wait_cmd(FAS216_Info *info, int cmd)
 {
     int tout;
     int stat;
 
     fas216_cmd(info, cmd);
 
     for (tout = 1000; tout; tout -= 1) {
         stat = fas216_readb(info, REG_STAT);
         if (stat & (STAT_INT|STAT_PARITYERROR))
             break;
         udelay(1);
     }
 
     return stat;
 }
 
 static int fas216_get_msg_byte(FAS216_Info *info)
 {
     unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
 
     if ((stat & STAT_INT) == 0)
         goto timedout;
 
     if ((stat & STAT_BUSMASK) != STAT_MESGIN)
         goto unexpected_phase_change;
 
     fas216_readb(info, REG_INST);
 
     stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
 
     if ((stat & STAT_INT) == 0)
         goto timedout;
 
     if (stat & STAT_PARITYERROR)
         goto parity_error;
 
     if ((stat & STAT_BUSMASK) != STAT_MESGIN)
         goto unexpected_phase_change;
 
     fas216_readb(info, REG_INST);
 
     return fas216_readb(info, REG_FF);
 
 timedout:
     fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
     return -1;
 
 unexpected_phase_change:
     fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
     return -2;
 
 parity_error:
     fas216_log(info, LOG_ERROR, "parity error during message in phase");
     return -3;
 }
 
 /**
  * fas216_message - handle a function done interrupt from FAS216 chip
  * @info: interface which caused function done interrupt
  *
  * Handle a function done interrupt from FAS216 chip
  */
 static void fas216_message(FAS216_Info *info)
 {
     unsigned char *message = info->scsi.message;
     unsigned int msglen = 1;
     int msgbyte = 0;
 
     fas216_checkmagic(info);
 
     message[0] = fas216_readb(info, REG_FF);
 
     if (message[0] == EXTENDED_MESSAGE) {
         msgbyte = fas216_get_msg_byte(info);
 
         if (msgbyte >= 0) {
             message[1] = msgbyte;
 
             for (msglen = 2; msglen < message[1] + 2; msglen++) {
                 msgbyte = fas216_get_msg_byte(info);
 
                 if (msgbyte >= 0)
                     message[msglen] = msgbyte;
                 else
                     break;
             }
         }
     }
 
     if (msgbyte == -3)
         goto parity_error;
 
 #ifdef DEBUG_MESSAGES
     {
         int i;
 
         printk("scsi%d.%c: message in: ",
             info->host->host_no, fas216_target(info));
         for (i = 0; i < msglen; i++)
             printk("%02X ", message[i]);
         printk("\n");
     }
 #endif
 
     fas216_parse_message(info, message, msglen);
     fas216_cmd(info, CMD_MSGACCEPTED);
     return;
 
 parity_error:
     fas216_cmd(info, CMD_SETATN);
     msgqueue_flush(&info->scsi.msgs);
     msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
     info->scsi.phase = PHASE_MSGOUT_EXPECT;
     fas216_cmd(info, CMD_MSGACCEPTED);
     return;
 }
 
 /**
  * fas216_send_command - send command after all message bytes have been sent
  * @info: interface which caused bus service
  *
  * Send a command to a target after all message bytes have been sent
  */
 static void fas216_send_command(FAS216_Info *info)
 {
     int i;
 
     fas216_checkmagic(info);
 
     fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
     fas216_cmd(info, CMD_FLUSHFIFO);
 
     /* load command */
     for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
         fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
 
     fas216_cmd(info, CMD_TRANSFERINFO);
 
     info->scsi.phase = PHASE_COMMAND;
 }
 
 /**
  * fas216_send_messageout - handle bus service to send a message
  * @info: interface which caused bus service
  *
  * Handle bus service to send a message.
  * Note: We do not allow the device to change the data direction!
  */
 static void fas216_send_messageout(FAS216_Info *info, int start)
 {
     unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
 
     fas216_checkmagic(info);
 
     fas216_cmd(info, CMD_FLUSHFIFO);
 
     if (tot_msglen) {
         struct message *msg;
         int msgnr = 0;
 
         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
             int i;
 
             for (i = start; i < msg->length; i++)
                 fas216_writeb(info, REG_FF, msg->msg[i]);
 
             msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
             start = 0;
         }
     } else
         fas216_writeb(info, REG_FF, NOP);
 
     fas216_cmd(info, CMD_TRANSFERINFO);
 
     info->scsi.phase = PHASE_MSGOUT;
 }
 
 /**
  * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
  * @info: interface which caused bus service interrupt
  * @stat: Status register contents
  * @is: SCSI Status register contents
  *
  * Handle a bus service interrupt from FAS216 chip
  */
 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
 {
     fas216_checkmagic(info);
 
     fas216_log(info, LOG_BUSSERVICE,
            "bus service: stat=%02x is=%02x phase=%02x",
            stat, is, info->scsi.phase);
 
     switch (info->scsi.phase) {
     case PHASE_SELECTION:
         if ((is & IS_BITS) != IS_MSGBYTESENT)
             goto bad_is;
         break;
 
     case PHASE_SELSTEPS:
         switch (is & IS_BITS) {
         case IS_SELARB:
         case IS_MSGBYTESENT:
             goto bad_is;
 
         case IS_NOTCOMMAND:
         case IS_EARLYPHASE:
             if ((stat & STAT_BUSMASK) == STAT_MESGIN)
                 break;
             goto bad_is;
 
         case IS_COMPLETE:
             break;
         }
         break;
 
     default:
         break;
     }
 
     fas216_cmd(info, CMD_NOP);
 
 #define STATE(st,ph) ((ph) << 3 | (st))
     /* This table describes the legal SCSI state transitions,
      * as described by the SCSI II spec.
      */
     switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
     case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
     case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
     case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
     case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
         info->scsi.phase = PHASE_DATAIN;
         fas216_transfer(info);
         return;
 
     case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
     case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
         fas216_cleanuptransfer(info);
         fas216_transfer(info);
         return;
 
     case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
     case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
     case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
     case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
         fas216_cmd(info, CMD_FLUSHFIFO);
         info->scsi.phase = PHASE_DATAOUT;
         fas216_transfer(info);
         return;
 
     case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
     case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
         fas216_stoptransfer(info);
         fallthrough;
 
     case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
     case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
     case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
     case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
         fas216_cmd(info, CMD_INITCMDCOMPLETE);
         info->scsi.phase = PHASE_STATUS;
         return;
 
     case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
     case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
         fas216_stoptransfer(info);
         fallthrough;
 
     case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command  -> Message In   */
     case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
     case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
         info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
         fas216_cmd(info, CMD_FLUSHFIFO);
         fas216_cmd(info, CMD_TRANSFERINFO);
         info->scsi.phase = PHASE_MSGIN;
         return;
 
     case STATE(STAT_MESGIN, PHASE_MSGIN):
         info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
         fas216_cmd(info, CMD_TRANSFERINFO);
         return;
 
     case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
     case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
         fas216_send_command(info);
         info->scsi.phase = PHASE_COMMAND;
         return;
 
 
     /*
      * Selection    -> Message Out
      */
     case STATE(STAT_MESGOUT, PHASE_SELECTION):
         fas216_send_messageout(info, 1);
         return;
 
     /*
      * Message Out  -> Message Out
      */
     case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
     case STATE(STAT_MESGOUT, PHASE_MSGOUT):
         /*
          * If we get another message out phase, this usually
          * means some parity error occurred.  Resend complete
          * set of messages.  If we have more than one byte to
          * send, we need to assert ATN again.
          */
         if (info->device[info->SCpnt->device->id].parity_check) {
             /*
              * We were testing... good, the device
              * supports parity checking.
              */
             info->device[info->SCpnt->device->id].parity_check = 0;
             info->device[info->SCpnt->device->id].parity_enabled = 1;
             fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
         }
 
         if (msgqueue_msglength(&info->scsi.msgs) > 1)
             fas216_cmd(info, CMD_SETATN);
         fallthrough;
 
     /*
      * Any          -> Message Out
      */
     case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
         fas216_send_messageout(info, 0);
         return;
 
     /* Error recovery rules.
      *   These either attempt to abort or retry the operation.
      * TODO: we need more of these
      */
     case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
         /* error - we've sent out all the command bytes
          * we have.
          * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
          * to include the command bytes sent for this to work
          * correctly.
          */
         printk(KERN_ERR "scsi%d.%c: "
             "target trying to receive more command bytes\n",
             info->host->host_no, fas216_target(info));
         fas216_cmd(info, CMD_SETATN);
         fas216_set_stc(info, 15);
         fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
         msgqueue_flush(&info->scsi.msgs);
         msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
         info->scsi.phase = PHASE_MSGOUT_EXPECT;
         return;
     }
 
     if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
         printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
             info->host->host_no, fas216_target(info),
             fas216_bus_phase(stat));
         msgqueue_flush(&info->scsi.msgs);
         fas216_cmd(info, CMD_SETATN);
         msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
         info->scsi.phase = PHASE_MSGOUT_EXPECT;
         info->scsi.aborting = 1;
         fas216_cmd(info, CMD_TRANSFERINFO);
         return;
     }
     printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
         info->host->host_no, fas216_target(info),
         fas216_bus_phase(stat),
         fas216_drv_phase(info));
     print_debug_list();
     return;
 
 bad_is:
     fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
     fas216_dumpstate(info);
     print_debug_list();
 
     fas216_done(info, DID_ERROR);
 }
 
 /**
  * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
  * @info: interface which caused function done interrupt
  * @stat: Status register contents
  * @is: SCSI Status register contents
  *
  * Handle a function done interrupt from FAS216 chip
  */
 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
 {
     unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
 
     fas216_checkmagic(info);
 
     fas216_log(info, LOG_FUNCTIONDONE,
            "function done: stat=%02x is=%02x phase=%02x",
            stat, is, info->scsi.phase);
 
     switch (info->scsi.phase) {
     case PHASE_STATUS:          /* status phase - read status and msg   */
         if (fifo_len != 2) {
             fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
         }
         /*
          * Read status then message byte.
          */
         info->scsi.SCp.Status = fas216_readb(info, REG_FF);
         info->scsi.SCp.Message = fas216_readb(info, REG_FF);
         info->scsi.phase = PHASE_DONE;
         fas216_cmd(info, CMD_MSGACCEPTED);
         break;
 
     case PHASE_IDLE:
     case PHASE_SELECTION:
     case PHASE_SELSTEPS:
         break;
 
     case PHASE_MSGIN:           /* message in phase         */
         if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
             info->scsi.msgin_fifo = fifo_len;
             fas216_message(info);
             break;
         }
         fallthrough;
 
     default:
         fas216_log(info, 0, "internal phase %s for function done?"
             "  What do I do with this?",
             fas216_target(info), fas216_drv_phase(info));
     }
 }
 
 static void fas216_bus_reset(FAS216_Info *info)
 {
     neg_t sync_state;
     int i;
 
     msgqueue_flush(&info->scsi.msgs);
 
     sync_state = neg_invalid;
 
 #ifdef SCSI2_SYNC
     if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
         sync_state = neg_wait;
 #endif
 
     info->scsi.phase = PHASE_IDLE;
     info->SCpnt = NULL; /* bug! */
     memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
 
     for (i = 0; i < 8; i++) {
         info->device[i].disconnect_ok   = info->ifcfg.disconnect_ok;
         info->device[i].sync_state  = sync_state;
         info->device[i].period      = info->ifcfg.asyncperiod / 4;
         info->device[i].stp     = info->scsi.async_stp;
         info->device[i].sof     = 0;
         info->device[i].wide_xfer   = 0;
     }
 
     info->rst_bus_status = 1;
     wake_up(&info->eh_wait);
 }
 
 /**
  * fas216_intr - handle interrupts to progress a command
  * @info: interface to service
  *
  * Handle interrupts from the interface to progress a command
  */
 irqreturn_t fas216_intr(FAS216_Info *info)
 {
     unsigned char inst, is, stat;
     int handled = IRQ_NONE;
 
     fas216_checkmagic(info);
 
     stat = fas216_readb(info, REG_STAT);
     is = fas216_readb(info, REG_IS);
     inst = fas216_readb(info, REG_INST);
 
     add_debug_list(stat, is, inst, info->scsi.phase);
 
     if (stat & STAT_INT) {
         if (inst & INST_BUSRESET) {
             fas216_log(info, 0, "bus reset detected");
             fas216_bus_reset(info);
             scsi_report_bus_reset(info->host, 0);
         } else if (inst & INST_ILLEGALCMD) {
             fas216_log(info, LOG_ERROR, "illegal command given\n");
             fas216_dumpstate(info);
             print_debug_list();
         } else if (inst & INST_DISCONNECT)
             fas216_disconnect_intr(info);
         else if (inst & INST_RESELECTED)    /* reselected           */
             fas216_reselected_intr(info);
         else if (inst & INST_BUSSERVICE)    /* bus service request      */
             fas216_busservice_intr(info, stat, is);
         else if (inst & INST_FUNCDONE)      /* function done        */
             fas216_funcdone_intr(info, stat, is);
         else
                 fas216_log(info, 0, "unknown interrupt received:"
                 " phase %s inst %02X is %02X stat %02X",
                 fas216_drv_phase(info), inst, is, stat);
         handled = IRQ_HANDLED;
     }
     return handled;
 }
 
 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
 {
     int tot_msglen;
 
     /* following what the ESP driver says */
     fas216_set_stc(info, 0);
     fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
 
     /* flush FIFO */
     fas216_cmd(info, CMD_FLUSHFIFO);
 
     /* load bus-id and timeout */
     fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
     fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
 
     /* synchronous transfers */
     fas216_set_sync(info, SCpnt->device->id);
 
     tot_msglen = msgqueue_msglength(&info->scsi.msgs);
 
 #ifdef DEBUG_MESSAGES
     {
         struct message *msg;
         int msgnr = 0, i;
 
         printk("scsi%d.%c: message out: ",
             info->host->host_no, '0' + SCpnt->device->id);
         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
             printk("{ ");
             for (i = 0; i < msg->length; i++)
                 printk("%02x ", msg->msg[i]);
             printk("} ");
         }
         printk("\n");
     }
 #endif
 
     if (tot_msglen == 1 || tot_msglen == 3) {
         /*
          * We have an easy message length to send...
          */
         struct message *msg;
         int msgnr = 0, i;
 
         info->scsi.phase = PHASE_SELSTEPS;
 
         /* load message bytes */
         while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
             for (i = 0; i < msg->length; i++)
                 fas216_writeb(info, REG_FF, msg->msg[i]);
             msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
         }
 
         /* load command */
         for (i = 0; i < SCpnt->cmd_len; i++)
             fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
 
         if (tot_msglen == 1)
             fas216_cmd(info, CMD_SELECTATN);
         else
             fas216_cmd(info, CMD_SELECTATN3);
     } else {
         /*
          * We have an unusual number of message bytes to send.
          *  Load first byte into fifo, and issue SELECT with ATN and
          *  stop steps.
          */
         struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
 
         fas216_writeb(info, REG_FF, msg->msg[0]);
         msg->fifo = 1;
 
         fas216_cmd(info, CMD_SELECTATNSTOP);
     }
 }
 
 /*
  * Decide whether we need to perform a parity test on this device.
  * Can also be used to force parity error conditions during initial
  * information transfer phase (message out) for test purposes.
  */
 static int parity_test(FAS216_Info *info, int target)
 {
 #if 0
     if (target == 3) {
         info->device[target].parity_check = 0;
         return 1;
     }
 #endif
     return info->device[target].parity_check;
 }
 
 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
 {
     int disconnect_ok;
 
     /*
      * claim host busy
      */
     info->scsi.phase = PHASE_SELECTION;
     info->scsi.SCp = *arm_scsi_pointer(SCpnt);
     info->SCpnt = SCpnt;
     info->dma.transfer_type = fasdma_none;
 
     if (parity_test(info, SCpnt->device->id))
         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
     else
         fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
 
     /*
      * Don't allow request sense commands to disconnect.
      */
     disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
             info->device[SCpnt->device->id].disconnect_ok;
 
     /*
      * build outgoing message bytes
      */
     msgqueue_flush(&info->scsi.msgs);
     msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
 
     /*
      * add tag message if required
      */
     if (SCpnt->device->simple_tags)
         msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG,
                 scsi_cmd_to_rq(SCpnt)->tag);
 
     do {
 #ifdef SCSI2_SYNC
         if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
              info->device[SCpnt->device->id].sync_state == neg_complete) &&
             (SCpnt->cmnd[0] == REQUEST_SENSE ||
              SCpnt->cmnd[0] == INQUIRY)) {
             info->device[SCpnt->device->id].sync_state = neg_inprogress;
             msgqueue_addmsg(&info->scsi.msgs, 5,
                     EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
                     1000 / info->ifcfg.clockrate,
                     info->ifcfg.sync_max_depth);
             break;
         }
 #endif
     } while (0);
 
     __fas216_start_command(info, SCpnt);
 }
 
 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
 {
     set_bit(SCpnt->device->id * 8 +
         (u8)(SCpnt->device->lun & 0x7), info->busyluns);
 
     info->stats.removes += 1;
     switch (SCpnt->cmnd[0]) {
     case WRITE_6:
     case WRITE_10:
     case WRITE_12:
         info->stats.writes += 1;
         break;
     case READ_6:
     case READ_10:
     case READ_12:
         info->stats.reads += 1;
         break;
     default:
         info->stats.miscs += 1;
         break;
     }
 }
 
 static void fas216_do_bus_device_reset(FAS216_Info *info,
                        struct scsi_cmnd *SCpnt)
 {
     struct message *msg;
 
     /*
      * claim host busy
      */
     info->scsi.phase = PHASE_SELECTION;
     info->scsi.SCp = *arm_scsi_pointer(SCpnt);
     info->SCpnt = SCpnt;
     info->dma.transfer_type = fasdma_none;
 
     fas216_log(info, LOG_ERROR, "sending bus device reset");
 
     msgqueue_flush(&info->scsi.msgs);
     msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
 
     /* following what the ESP driver says */
     fas216_set_stc(info, 0);
     fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
 
     /* flush FIFO */
     fas216_cmd(info, CMD_FLUSHFIFO);
 
     /* load bus-id and timeout */
     fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
     fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
 
     /* synchronous transfers */
     fas216_set_sync(info, SCpnt->device->id);
 
     msg = msgqueue_getmsg(&info->scsi.msgs, 0);
 
     fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
     msg->fifo = 1;
 
     fas216_cmd(info, CMD_SELECTATNSTOP);
 }
 
 /**
  * fas216_kick - kick a command to the interface
  * @info: our host interface to kick
  *
  * Kick a command to the interface, interface should be idle.
  * Notes: Interrupts are always disabled!
  */
 static void fas216_kick(FAS216_Info *info)
 {
     struct scsi_cmnd *SCpnt = NULL;
 #define TYPE_OTHER  0
 #define TYPE_RESET  1
 #define TYPE_QUEUE  2
     int where_from = TYPE_OTHER;
 
     fas216_checkmagic(info);
 
     /*
      * Obtain the next command to process.
      */
     do {
         if (info->rstSCpnt) {
             SCpnt = info->rstSCpnt;
             /* don't remove it */
             where_from = TYPE_RESET;
             break;
         }
 
         if (info->reqSCpnt) {
             SCpnt = info->reqSCpnt;
             info->reqSCpnt = NULL;
             break;
         }
 
         if (info->origSCpnt) {
             SCpnt = info->origSCpnt;
             info->origSCpnt = NULL;
             break;
         }
 
         /* retrieve next command */
         if (!SCpnt) {
             SCpnt = queue_remove_exclude(&info->queues.issue,
                              info->busyluns);
             where_from = TYPE_QUEUE;
             break;
         }
     } while (0);
 
     if (!SCpnt) {
         /*
          * no command pending, so enable reselection.
          */
         fas216_cmd(info, CMD_ENABLESEL);
         return;
     }
 
     /*
      * We're going to start a command, so disable reselection
      */
     fas216_cmd(info, CMD_DISABLESEL);
 
     if (info->scsi.disconnectable && info->SCpnt) {
         fas216_log(info, LOG_CONNECT,
             "moved command for %d to disconnected queue",
             info->SCpnt->device->id);
         queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
         info->scsi.disconnectable = 0;
         info->SCpnt = NULL;
     }
 
     fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
                "starting");
 
     switch (where_from) {
     case TYPE_QUEUE:
         fas216_allocate_tag(info, SCpnt);
         fallthrough;
     case TYPE_OTHER:
         fas216_start_command(info, SCpnt);
         break;
     case TYPE_RESET:
         fas216_do_bus_device_reset(info, SCpnt);
         break;
     }
 
     fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
         info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
 
     /*
      * should now get either DISCONNECT or
      * (FUNCTION DONE with BUS SERVICE) interrupt
      */
 }
 
 /*
  * Clean up from issuing a BUS DEVICE RESET message to a device.
  */
 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
                     unsigned int result)
 {
     fas216_log(info, LOG_ERROR, "fas216 device reset complete");
 
     info->rstSCpnt = NULL;
     info->rst_dev_status = 1;
     wake_up(&info->eh_wait);
 }
 
 /**
  * fas216_rq_sns_done - Finish processing automatic request sense command
  * @info: interface that completed
  * @SCpnt: command that completed
  * @result: driver byte of result
  *
  * Finish processing automatic request sense command
  */
 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
                    unsigned int result)
 {
     struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
 
     fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
            "request sense complete, result=0x%04x%02x%02x",
            result, scsi_pointer->Message, scsi_pointer->Status);
 
     if (result != DID_OK || scsi_pointer->Status != SAM_STAT_GOOD)
         /*
          * Something went wrong.  Make sure that we don't
          * have valid data in the sense buffer that could
          * confuse the higher levels.
          */
         memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
     /*
      * Note that we don't set SCpnt->result, since that should
      * reflect the status of the command that we were asked by
      * the upper layers to process.  This would have been set
      * correctly by fas216_std_done.
      */
     scsi_eh_restore_cmnd(SCpnt, &info->ses);
     fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
 }
 
 /**
  * fas216_std_done - finish processing of standard command
  * @info: interface that completed
  * @SCpnt: command that completed
  * @result: driver byte of result
  *
  * Finish processing of standard command
  */
 static void
 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
 {
     struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
 
     info->stats.fins += 1;
 
     set_host_byte(SCpnt, result);
     if (result == DID_OK)
         scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message);
     set_status_byte(SCpnt, info->scsi.SCp.Status);
 
     fas216_log_command(info, LOG_CONNECT, SCpnt,
         "command complete, result=0x%08x", SCpnt->result);
 
     /*
      * If the driver detected an error, we're all done.
      */
     if (get_host_byte(SCpnt) != DID_OK)
         goto done;
 
     /*
      * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
      * status, request the sense information.
      */
     if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION ||
         get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED)
         goto request_sense;
 
     /*
      * If the command did not complete with GOOD status,
      * we are all done here.
      */
     if (get_status_byte(SCpnt) != SAM_STAT_GOOD)
         goto done;
 
     /*
      * We have successfully completed a command.  Make sure that
      * we do not have any buffers left to transfer.  The world
      * is not perfect, and we seem to occasionally hit this.
      * It can be indicative of a buggy driver, target or the upper
      * levels of the SCSI code.
      */
     if (info->scsi.SCp.ptr) {
         switch (SCpnt->cmnd[0]) {
         case INQUIRY:
         case START_STOP:
         case MODE_SENSE:
             break;
 
         default:
             scmd_printk(KERN_ERR, SCpnt,
                     "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
                     SCpnt->result, info->scsi.SCp.ptr,
                     info->scsi.SCp.this_residual);
             scsi_print_command(SCpnt);
             set_host_byte(SCpnt, DID_ERROR);
             goto request_sense;
         }
     }
 
 done:
     if (fas216_cmd_priv(SCpnt)->scsi_done) {
         fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
         return;
     }
 
     panic("scsi%d.H: null scsi_done function in fas216_done",
         info->host->host_no);
 
 
 request_sense:
     if (SCpnt->cmnd[0] == REQUEST_SENSE)
         goto done;
 
     scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
     fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
               "requesting sense");
     init_SCp(SCpnt);
     scsi_pointer->Message = 0;
     scsi_pointer->Status = 0;
     SCpnt->host_scribble = (void *)fas216_rq_sns_done;
 
     /*
      * Place this command into the high priority "request
      * sense" slot.  This will be the very next command
      * executed, unless a target connects to us.
      */
     if (info->reqSCpnt)
         printk(KERN_WARNING "scsi%d.%c: losing request command\n",
             info->host->host_no, '0' + SCpnt->device->id);
     info->reqSCpnt = SCpnt;
 }
 
 /**
  * fas216_done - complete processing for current command
  * @info: interface that completed
  * @result: driver byte of result
  *
  * Complete processing for current command
  */
 static void fas216_done(FAS216_Info *info, unsigned int result)
 {
     void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
     struct scsi_cmnd *SCpnt;
     unsigned long flags;
 
     fas216_checkmagic(info);
 
     if (!info->SCpnt)
         goto no_command;
 
     SCpnt = info->SCpnt;
     info->SCpnt = NULL;
         info->scsi.phase = PHASE_IDLE;
 
     if (info->scsi.aborting) {
         fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
         result = DID_ABORT;
         info->scsi.aborting = 0;
     }
 
     /*
      * Sanity check the completion - if we have zero bytes left
      * to transfer, we should not have a valid pointer.
      */
     if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
         scmd_printk(KERN_INFO, SCpnt,
                 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
                 info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
         info->scsi.SCp.ptr = NULL;
         scsi_print_command(SCpnt);
     }
 
     /*
      * Clear down this command as completed.  If we need to request
      * the sense information, fas216_kick will re-assert the busy
      * status.
      */
     info->device[SCpnt->device->id].parity_check = 0;
     clear_bit(SCpnt->device->id * 8 +
           (u8)(SCpnt->device->lun & 0x7), info->busyluns);
 
     fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
     fn(info, SCpnt, result);
 
     if (info->scsi.irq) {
         spin_lock_irqsave(&info->host_lock, flags);
         if (info->scsi.phase == PHASE_IDLE)
             fas216_kick(info);
         spin_unlock_irqrestore(&info->host_lock, flags);
     }
     return;
 
 no_command:
     panic("scsi%d.H: null command in fas216_done",
         info->host->host_no);
 }
 
 /**
  * fas216_queue_command_internal - queue a command for the adapter to process
  * @SCpnt: Command to queue
  * @done: done function to call once command is complete
  *
  * Queue a command for adapter to process.
  * Returns: 0 on success, else error.
  * Notes: io_request_lock is held, interrupts are disabled.
  */
 static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt,
                      void (*done)(struct scsi_cmnd *))
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
     int result;
 
     fas216_checkmagic(info);
 
     fas216_log_command(info, LOG_CONNECT, SCpnt,
                "received command (%p)", SCpnt);
 
     fas216_cmd_priv(SCpnt)->scsi_done = done;
     SCpnt->host_scribble = (void *)fas216_std_done;
     SCpnt->result = 0;
 
     init_SCp(SCpnt);
 
     info->stats.queues += 1;
 
     spin_lock(&info->host_lock);
 
     /*
      * Add command into execute queue and let it complete under
      * whatever scheme we're using.
      */
     result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
 
     /*
      * If we successfully added the command,
      * kick the interface to get it moving.
      */
     if (result == 0 && info->scsi.phase == PHASE_IDLE)
         fas216_kick(info);
     spin_unlock(&info->host_lock);
 
     fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
         result ? "failure" : "success");
 
     return result;
 }
 
 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt)
 {
     return fas216_queue_command_internal(SCpnt, scsi_done);
 }
 
 DEF_SCSI_QCMD(fas216_queue_command)
 
 /**
  * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
  * @SCpnt: Command to wake
  *
  * Trigger restart of a waiting thread in fas216_command
  */
 static void fas216_internal_done(struct scsi_cmnd *SCpnt)
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
 
     fas216_checkmagic(info);
 
     info->internal_done = 1;
 }
 
 /**
  * fas216_noqueue_command - process a command for the adapter.
  * @SCpnt: Command to queue
  *
  * Queue a command for adapter to process.
  * Returns: scsi result code.
  * Notes: io_request_lock is held, interrupts are disabled.
  */
 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt)
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
 
     fas216_checkmagic(info);
 
     /*
      * We should only be using this if we don't have an interrupt.
      * Provide some "incentive" to use the queueing code.
      */
     BUG_ON(info->scsi.irq);
 
     info->internal_done = 0;
     fas216_queue_command_internal(SCpnt, fas216_internal_done);
 
     /*
      * This wastes time, since we can't return until the command is
      * complete. We can't sleep either since we may get re-entered!
      * However, we must re-enable interrupts, or else we'll be
      * waiting forever.
      */
     spin_unlock_irq(info->host->host_lock);
 
     while (!info->internal_done) {
         /*
          * If we don't have an IRQ, then we must poll the card for
          * it's interrupt, and use that to call this driver's
          * interrupt routine.  That way, we keep the command
          * progressing.  Maybe we can add some intelligence here
          * and go to sleep if we know that the device is going
          * to be some time (eg, disconnected).
          */
         if (fas216_readb(info, REG_STAT) & STAT_INT) {
             spin_lock_irq(info->host->host_lock);
             fas216_intr(info);
             spin_unlock_irq(info->host->host_lock);
         }
     }
 
     spin_lock_irq(info->host->host_lock);
 
     scsi_done(SCpnt);
 
     return 0;
 }
 
 DEF_SCSI_QCMD(fas216_noqueue_command)
 
 /*
  * Error handler timeout function.  Indicate that we timed out,
  * and wake up any error handler process so it can continue.
  */
 static void fas216_eh_timer(struct timer_list *t)
 {
     FAS216_Info *info = from_timer(info, t, eh_timer);
 
     fas216_log(info, LOG_ERROR, "error handling timed out\n");
 
     del_timer(&info->eh_timer);
 
     if (info->rst_bus_status == 0)
         info->rst_bus_status = -1;
     if (info->rst_dev_status == 0)
         info->rst_dev_status = -1;
 
     wake_up(&info->eh_wait);
 }
 
 enum res_find {
     res_failed,     /* not found            */
     res_success,        /* command on issue queue   */
     res_hw_abort        /* command on disconnected dev  */
 };
 
 /**
  * fas216_do_abort - decide how to abort a command
  * @SCpnt: command to abort
  *
  * Decide how to abort a command.
  * Returns: abort status
  */
 static enum res_find fas216_find_command(FAS216_Info *info,
                      struct scsi_cmnd *SCpnt)
 {
     enum res_find res = res_failed;
 
     if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
         /*
          * The command was on the issue queue, and has not been
          * issued yet.  We can remove the command from the queue,
          * and acknowledge the abort.  Neither the device nor the
          * interface know about the command.
          */
         printk("on issue queue ");
 
         res = res_success;
     } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
         /*
          * The command was on the disconnected queue.  We must
          * reconnect with the device if possible, and send it
          * an abort message.
          */
         printk("on disconnected queue ");
 
         res = res_hw_abort;
     } else if (info->SCpnt == SCpnt) {
         printk("executing ");
 
         switch (info->scsi.phase) {
         /*
          * If the interface is idle, and the command is 'disconnectable',
          * then it is the same as on the disconnected queue.
          */
         case PHASE_IDLE:
             if (info->scsi.disconnectable) {
                 info->scsi.disconnectable = 0;
                 info->SCpnt = NULL;
                 res = res_hw_abort;
             }
             break;
 
         default:
             break;
         }
     } else if (info->origSCpnt == SCpnt) {
         /*
          * The command will be executed next, but a command
          * is currently using the interface.  This is similar to
          * being on the issue queue, except the busylun bit has
          * been set.
          */
         info->origSCpnt = NULL;
         clear_bit(SCpnt->device->id * 8 +
               (u8)(SCpnt->device->lun & 0x7), info->busyluns);
         printk("waiting for execution ");
         res = res_success;
     } else
         printk("unknown ");
 
     return res;
 }
 
 /**
  * fas216_eh_abort - abort this command
  * @SCpnt: command to abort
  *
  * Abort this command.
  * Returns: FAILED if unable to abort
  * Notes: io_request_lock is taken, and irqs are disabled
  */
 int fas216_eh_abort(struct scsi_cmnd *SCpnt)
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
     int result = FAILED;
 
     fas216_checkmagic(info);
 
     info->stats.aborts += 1;
 
     scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
 
     print_debug_list();
     fas216_dumpstate(info);
 
     switch (fas216_find_command(info, SCpnt)) {
     /*
      * We found the command, and cleared it out.  Either
      * the command is still known to be executing on the
      * target, or the busylun bit is not set.
      */
     case res_success:
         scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
         result = SUCCESS;
         break;
 
     /*
      * We need to reconnect to the target and send it an
      * ABORT or ABORT_TAG message.  We can only do this
      * if the bus is free.
      */
     case res_hw_abort:
 
     /*
      * We are unable to abort the command for some reason.
      */
     default:
     case res_failed:
         scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
         break;
     }
 
     return result;
 }
 
 /**
  * fas216_eh_device_reset - Reset the device associated with this command
  * @SCpnt: command specifing device to reset
  *
  * Reset the device associated with this command.
  * Returns: FAILED if unable to reset.
  * Notes: We won't be re-entered, so we'll only have one device
  * reset on the go at one time.
  */
 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
     unsigned long flags;
     int i, res = FAILED, target = SCpnt->device->id;
 
     fas216_log(info, LOG_ERROR, "device reset for target %d", target);
 
     spin_lock_irqsave(&info->host_lock, flags);
 
     do {
         /*
          * If we are currently connected to a device, and
          * it is the device we want to reset, there is
          * nothing we can do here.  Chances are it is stuck,
          * and we need a bus reset.
          */
         if (info->SCpnt && !info->scsi.disconnectable &&
             info->SCpnt->device->id == SCpnt->device->id)
             break;
 
         /*
          * We're going to be resetting this device.  Remove
          * all pending commands from the driver.  By doing
          * so, we guarantee that we won't touch the command
          * structures except to process the reset request.
          */
         queue_remove_all_target(&info->queues.issue, target);
         queue_remove_all_target(&info->queues.disconnected, target);
         if (info->origSCpnt && info->origSCpnt->device->id == target)
             info->origSCpnt = NULL;
         if (info->reqSCpnt && info->reqSCpnt->device->id == target)
             info->reqSCpnt = NULL;
         for (i = 0; i < 8; i++)
             clear_bit(target * 8 + i, info->busyluns);
 
         /*
          * Hijack this SCSI command structure to send
          * a bus device reset message to this device.
          */
         SCpnt->host_scribble = (void *)fas216_devicereset_done;
 
         info->rst_dev_status = 0;
         info->rstSCpnt = SCpnt;
 
         if (info->scsi.phase == PHASE_IDLE)
             fas216_kick(info);
 
         mod_timer(&info->eh_timer, jiffies + 30 * HZ);
         spin_unlock_irqrestore(&info->host_lock, flags);
 
         /*
          * Wait up to 30 seconds for the reset to complete.
          */
         wait_event(info->eh_wait, info->rst_dev_status);
 
         del_timer_sync(&info->eh_timer);
         spin_lock_irqsave(&info->host_lock, flags);
         info->rstSCpnt = NULL;
 
         if (info->rst_dev_status == 1)
             res = SUCCESS;
     } while (0);
 
     SCpnt->host_scribble = NULL;
     spin_unlock_irqrestore(&info->host_lock, flags);
 
     fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
            res == SUCCESS ? "success" : "failed");
 
     return res;
 }
 
 /**
  * fas216_eh_bus_reset - Reset the bus associated with the command
  * @SCpnt: command specifing bus to reset
  *
  * Reset the bus associated with the command.
  * Returns: FAILED if unable to reset.
  * Notes: Further commands are blocked.
  */
 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
     unsigned long flags;
     struct scsi_device *SDpnt;
 
     fas216_checkmagic(info);
     fas216_log(info, LOG_ERROR, "resetting bus");
 
     info->stats.bus_resets += 1;
 
     spin_lock_irqsave(&info->host_lock, flags);
 
     /*
      * Stop all activity on this interface.
      */
     fas216_aborttransfer(info);
     fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
 
     /*
      * Clear any pending interrupts.
      */
     while (fas216_readb(info, REG_STAT) & STAT_INT)
         fas216_readb(info, REG_INST);
 
     info->rst_bus_status = 0;
 
     /*
      * For each attached hard-reset device, clear out
      * all command structures.  Leave the running
      * command in place.
      */
     shost_for_each_device(SDpnt, info->host) {
         int i;
 
         if (SDpnt->soft_reset)
             continue;
 
         queue_remove_all_target(&info->queues.issue, SDpnt->id);
         queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
         if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
             info->origSCpnt = NULL;
         if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
             info->reqSCpnt = NULL;
         info->SCpnt = NULL;
 
         for (i = 0; i < 8; i++)
             clear_bit(SDpnt->id * 8 + i, info->busyluns);
     }
 
     info->scsi.phase = PHASE_IDLE;
 
     /*
      * Reset the SCSI bus.  Device cleanup happens in
      * the interrupt handler.
      */
     fas216_cmd(info, CMD_RESETSCSI);
 
     mod_timer(&info->eh_timer, jiffies + HZ);
     spin_unlock_irqrestore(&info->host_lock, flags);
 
     /*
      * Wait one second for the interrupt.
      */
     wait_event(info->eh_wait, info->rst_bus_status);
     del_timer_sync(&info->eh_timer);
 
     fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
            info->rst_bus_status == 1 ? "success" : "failed");
 
     return info->rst_bus_status == 1 ? SUCCESS : FAILED;
 }
 
 /**
  * fas216_init_chip - Initialise FAS216 state after reset
  * @info: state structure for interface
  *
  * Initialise FAS216 state after reset
  */
 static void fas216_init_chip(FAS216_Info *info)
 {
     unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
     fas216_writeb(info, REG_CLKF, clock);
     fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
     fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
     fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
     fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
     fas216_writeb(info, REG_SOF, 0);
     fas216_writeb(info, REG_STP, info->scsi.async_stp);
     fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
 }
 
 /**
  * fas216_eh_host_reset - Reset the host associated with this command
  * @SCpnt: command specifing host to reset
  *
  * Reset the host associated with this command.
  * Returns: FAILED if unable to reset.
  * Notes: io_request_lock is taken, and irqs are disabled
  */
 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
 {
     FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
 
     spin_lock_irq(info->host->host_lock);
 
     fas216_checkmagic(info);
 
     fas216_log(info, LOG_ERROR, "resetting host");
 
     /*
      * Reset the SCSI chip.
      */
     fas216_cmd(info, CMD_RESETCHIP);
 
     /*
      * Ugly ugly ugly!
      * We need to release the host_lock and enable
      * IRQs if we sleep, but we must relock and disable
      * IRQs after the sleep.
      */
     spin_unlock_irq(info->host->host_lock);
     msleep(50 * 1000/100);
     spin_lock_irq(info->host->host_lock);
 
     /*
      * Release the SCSI reset.
      */
     fas216_cmd(info, CMD_NOP);
 
     fas216_init_chip(info);
 
     spin_unlock_irq(info->host->host_lock);
     return SUCCESS;
 }
 
 #define TYPE_UNKNOWN    0
 #define TYPE_NCR53C90   1
 #define TYPE_NCR53C90A  2
 #define TYPE_NCR53C9x   3
 #define TYPE_Am53CF94   4
 #define TYPE_EmFAS216   5
 #define TYPE_QLFAS216   6
 
 static char *chip_types[] = {
     "unknown",
     "NS NCR53C90",
     "NS NCR53C90A",
     "NS NCR53C9x",
     "AMD Am53CF94",
     "Emulex FAS216",
     "QLogic FAS216"
 };
 
 static int fas216_detect_type(FAS216_Info *info)
 {
     int family, rev;
 
     /*
      * Reset the chip.
      */
     fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
     udelay(50);
     fas216_writeb(info, REG_CMD, CMD_NOP);
 
     /*
      * Check to see if control reg 2 is present.
      */
     fas216_writeb(info, REG_CNTL3, 0);
     fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
 
     /*
      * If we are unable to read back control reg 2
      * correctly, it is not present, and we have a
      * NCR53C90.
      */
     if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
         return TYPE_NCR53C90;
 
     /*
      * Now, check control register 3
      */
     fas216_writeb(info, REG_CNTL2, 0);
     fas216_writeb(info, REG_CNTL3, 0);
     fas216_writeb(info, REG_CNTL3, 5);
 
     /*
      * If we are unable to read the register back
      * correctly, we have a NCR53C90A
      */
     if (fas216_readb(info, REG_CNTL3) != 5)
         return TYPE_NCR53C90A;
 
     /*
      * Now read the ID from the chip.
      */
     fas216_writeb(info, REG_CNTL3, 0);
 
     fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
     fas216_writeb(info, REG_CNTL3, 0);
 
     fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
     udelay(50);
     fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
 
     fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
     fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
     udelay(50);
     fas216_writeb(info, REG_CMD, CMD_NOP);
 
     rev     = fas216_readb(info, REG_ID);
     family  = rev >> 3;
     rev    &= 7;
 
     switch (family) {
     case 0x01:
         if (rev == 4)
             return TYPE_Am53CF94;
         break;
 
     case 0x02:
         switch (rev) {
         case 2:
             return TYPE_EmFAS216;
         case 3:
             return TYPE_QLFAS216;
         }
         break;
 
     default:
         break;
     }
     printk("family %x rev %x\n", family, rev);
     return TYPE_NCR53C9x;
 }
 
 /**
  * fas216_reset_state - Initialise driver internal state
  * @info: state to initialise
  *
  * Initialise driver internal state
  */
 static void fas216_reset_state(FAS216_Info *info)
 {
     int i;
 
     fas216_checkmagic(info);
 
     fas216_bus_reset(info);
 
     /*
      * Clear out all stale info in our state structure
      */
     memset(info->busyluns, 0, sizeof(info->busyluns));
     info->scsi.disconnectable = 0;
     info->scsi.aborting = 0;
 
     for (i = 0; i < 8; i++) {
         info->device[i].parity_enabled  = 0;
         info->device[i].parity_check    = 1;
     }
 
     /*
      * Drain all commands on disconnected queue
      */
     while (queue_remove(&info->queues.disconnected) != NULL);
 
     /*
      * Remove executing commands.
      */
     info->SCpnt     = NULL;
     info->reqSCpnt  = NULL;
     info->rstSCpnt  = NULL;
     info->origSCpnt = NULL;
 }
 
 /**
  * fas216_init - initialise FAS/NCR/AMD SCSI structures.
  * @host: a driver-specific filled-out structure
  *
  * Initialise FAS/NCR/AMD SCSI structures.
  * Returns: 0 on success
  */
 int fas216_init(struct Scsi_Host *host)
 {
     FAS216_Info *info = (FAS216_Info *)host->hostdata;
 
     info->magic_start    = MAGIC;
     info->magic_end      = MAGIC;
     info->host           = host;
     info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
     info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
     info->scsi.cfg[2]    = info->ifcfg.cntl3 |
                    CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
     info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
 
     info->rst_dev_status = -1;
     info->rst_bus_status = -1;
     init_waitqueue_head(&info->eh_wait);
     timer_setup(&info->eh_timer, fas216_eh_timer, 0);
     
     spin_lock_init(&info->host_lock);
 
     memset(&info->stats, 0, sizeof(info->stats));
 
     msgqueue_initialise(&info->scsi.msgs);
 
     if (!queue_initialise(&info->queues.issue))
         return -ENOMEM;
 
     if (!queue_initialise(&info->queues.disconnected)) {
         queue_free(&info->queues.issue);
         return -ENOMEM;
     }
 
     return 0;
 }
 
 /**
  * fas216_add - initialise FAS/NCR/AMD SCSI ic.
  * @host: a driver-specific filled-out structure
  * @dev: parent device
  *
  * Initialise FAS/NCR/AMD SCSI ic.
  * Returns: 0 on success
  */
 int fas216_add(struct Scsi_Host *host, struct device *dev)
 {
     FAS216_Info *info = (FAS216_Info *)host->hostdata;
     int type, ret;
 
     if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
         printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
             info->ifcfg.clockrate);
         return -EINVAL;
     }
 
     fas216_reset_state(info);
     type = fas216_detect_type(info);
     info->scsi.type = chip_types[type];
 
     udelay(300);
 
     /*
      * Initialise the chip correctly.
      */
     fas216_init_chip(info);
 
     /*
      * Reset the SCSI bus.  We don't want to see
      * the resulting reset interrupt, so mask it
      * out.
      */
     fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
     fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
 
     /*
      * scsi standard says wait 250ms
      */
     spin_unlock_irq(info->host->host_lock);
     msleep(100*1000/100);
     spin_lock_irq(info->host->host_lock);
 
     fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
     fas216_readb(info, REG_INST);
 
     fas216_checkmagic(info);
 
     ret = scsi_add_host(host, dev);
     if (ret)
         fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
     else
         scsi_scan_host(host);
 
     return ret;
 }
 
 void fas216_remove(struct Scsi_Host *host)
 {
     FAS216_Info *info = (FAS216_Info *)host->hostdata;
 
     fas216_checkmagic(info);
     scsi_remove_host(host);
 
     fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
     scsi_host_put(host);
 }
 
 /**
  * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
  * @host: a driver-specific filled-out structure
  *
  * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
  */
 void fas216_release(struct Scsi_Host *host)
 {
     FAS216_Info *info = (FAS216_Info *)host->hostdata;
 
     queue_free(&info->queues.disconnected);
     queue_free(&info->queues.issue);
 }
 
 void fas216_print_host(FAS216_Info *info, struct seq_file *m)
 {
     seq_printf(m,
             "\n"
             "Chip    : %s\n"
             " Address: 0x%p\n"
             " IRQ    : %d\n"
             " DMA    : %d\n",
             info->scsi.type, info->scsi.io_base,
             info->scsi.irq, info->scsi.dma);
 }
 
 void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
 {
     seq_printf(m, "\n"
             "Command Statistics:\n"
             " Queued     : %u\n"
             " Issued     : %u\n"
             " Completed  : %u\n"
             " Reads      : %u\n"
             " Writes     : %u\n"
             " Others     : %u\n"
             " Disconnects: %u\n"
             " Aborts     : %u\n"
             " Bus resets : %u\n"
             " Host resets: %u\n",
             info->stats.queues,  info->stats.removes,
             info->stats.fins,    info->stats.reads,
             info->stats.writes,  info->stats.miscs,
             info->stats.disconnects, info->stats.aborts,
             info->stats.bus_resets,  info->stats.host_resets);
 }
 
 void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
 {
     struct fas216_device *dev;
     struct scsi_device *scd;
 
     seq_puts(m, "Device/Lun TaggedQ       Parity   Sync\n");
 
     shost_for_each_device(scd, info->host) {
         dev = &info->device[scd->id];
         seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
         if (scd->tagged_supported)
             seq_printf(m, "%3sabled ",
                      scd->simple_tags ? "en" : "dis");
         else
             seq_puts(m, "unsupported   ");
 
         seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
 
         if (dev->sof)
             seq_printf(m, "offset %d, %d ns\n",
                      dev->sof, dev->period * 4);
         else
             seq_puts(m, "async\n");
     }
 }
 
 EXPORT_SYMBOL(fas216_init);
 EXPORT_SYMBOL(fas216_add);
 EXPORT_SYMBOL(fas216_queue_command);
 EXPORT_SYMBOL(fas216_noqueue_command);
 EXPORT_SYMBOL(fas216_intr);
 EXPORT_SYMBOL(fas216_remove);
 EXPORT_SYMBOL(fas216_release);
 EXPORT_SYMBOL(fas216_eh_abort);
 EXPORT_SYMBOL(fas216_eh_device_reset);
 EXPORT_SYMBOL(fas216_eh_bus_reset);
 EXPORT_SYMBOL(fas216_eh_host_reset);
 EXPORT_SYMBOL(fas216_print_host);
 EXPORT_SYMBOL(fas216_print_stats);
 EXPORT_SYMBOL(fas216_print_devices);
 
 MODULE_AUTHOR("Russell King");
 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
 MODULE_LICENSE("GPL");