wd33c93.c

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/* 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 = (Scsi_Cmnd *)hostdata->selecting;   /* get a valid cmd */
            hostdata->selecting = NULL;
            }

         cmd->result = DID_NO_CONNECT << 16;
         hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
         hostdata->state = S_UNCONNECTED;
         cmd->scsi_done(cmd);

    /* 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...
     */

    restore_flags(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 = (Scsi_Cmnd *)hostdata->selecting;
         hostdata->selecting = NULL;

      /* construct an IDENTIFY message with correct disconnect bit */

         hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->lun);
         if (cmd->SCp.phase)
            hostdata->outgoing_msg[0] |= 0x40;

         if (hostdata->sync_stat[cmd->target] == SS_FIRST) {
#ifdef SYNC_DEBUG
printk(" sending SDTR ");
#endif

            hostdata->sync_stat[cmd->target] = SS_WAITING;

/* Tack on a 2nd message to ask about synchronous transfers. 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->target)) {
               hostdata->outgoing_msg[4] = hostdata->default_sx_per/4;
               hostdata->outgoing_msg[5] = 0;
               }
            else {
            hostdata->outgoing_msg[4] = OPTIMUM_SX_PER/4;
            hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF;
               }
            hostdata->outgoing_len = 6;
            }
         else
            hostdata->outgoing_len = 1;

         hostdata->state = S_CONNECTED;
         break;


      case CSR_XFER_DONE|PHS_DATA_IN:
      case CSR_UNEXP    |PHS_DATA_IN:
      case CSR_SRV_REQ  |PHS_DATA_IN:
DB(DB_INTR,printk("IN-%d.%d",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
         transfer_bytes(regs, cmd, DATA_IN_DIR);
         if (hostdata->state != S_RUNNING_LEVEL2)
            hostdata->state = S_CONNECTED;
         break;


      case CSR_XFER_DONE|PHS_DATA_OUT:
      case CSR_UNEXP    |PHS_DATA_OUT:
      case CSR_SRV_REQ  |PHS_DATA_OUT:
DB(DB_INTR,printk("OUT-%d.%d",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
         transfer_bytes(regs, cmd, DATA_OUT_DIR);
         if (hostdata->state != S_RUNNING_LEVEL2)
            hostdata->state = S_CONNECTED;
         break;


/* Note: this interrupt should not occur in a LEVEL2 command */

      case CSR_XFER_DONE|PHS_COMMAND:
      case CSR_UNEXP    |PHS_COMMAND:
      case CSR_SRV_REQ  |PHS_COMMAND:
DB(DB_INTR,printk("CMND-%02x,%ld",cmd->cmnd[0],cmd->pid))
         transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, hostdata);
         hostdata->state = S_CONNECTED;
         break;


      case CSR_XFER_DONE|PHS_STATUS:
      case CSR_UNEXP    |PHS_STATUS:
      case CSR_SRV_REQ  |PHS_STATUS:
DB(DB_INTR,printk("STATUS="))

         cmd->SCp.Status = read_1_byte(regs);
DB(DB_INTR,printk("%02x",cmd->SCp.Status))
         if (hostdata->level2 >= L2_BASIC) {
            sr = read_wd33c93(regs, WD_SCSI_STATUS);  /* clear interrupt */
            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;
            }
         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 */

         hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
         if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
            msg = EXTENDED_MESSAGE;
         else
            hostdata->incoming_ptr = 0;

         cmd->SCp.Message = msg;
         switch (msg) {

            case COMMAND_COMPLETE:
DB(DB_INTR,printk("CCMP-%ld",cmd->pid))
               write_wd33c93_cmd(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->target] == SS_WAITING)
                  hostdata->sync_stat[cmd->target] = SS_SET;
               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:
                        id = calc_sync_xfer(ucp[3],ucp[4]);
                        if (hostdata->sync_stat[cmd->target] != SS_WAITING) {

/* A device has sent an unsolicited SDTR message; rather than go
 * through the effort of decoding it and then figuring out what
 * our reply should be, we're just gonna say that we have a
 * synchronous fifo depth of 0. This will result in asynchronous
 * transfers - not ideal but so much easier.
 * Actually, this is OK because it assures us that if we don't
 * specifically ask for sync transfers, we won't do any.
 */

                           write_wd33c93_cmd(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;
                           hostdata->outgoing_msg[3] = hostdata->default_sx_per/4;
                           hostdata->outgoing_msg[4] = 0;
                           hostdata->outgoing_len = 5;
                           hostdata->sync_xfer[cmd->target] =
                                       calc_sync_xfer(hostdata->default_sx_per/4,0);
                           }
                        else {
                           hostdata->sync_xfer[cmd->target] = id;
                           }
#ifdef SYNC_DEBUG
printk("sync_xfer=%02x",hostdata->sync_xfer[cmd->target]);
#endif
                        hostdata->sync_stat[cmd->target] = SS_SET;
                        write_wd33c93_cmd(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;
            }
         restore_flags(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-%ld",cmd->pid))
            cmd->SCp.Message = COMMAND_COMPLETE;
            lun = read_wd33c93(regs, WD_TARGET_LUN);
DB(DB_INTR,printk(":%d.%d",cmd->SCp.Status,lun))
            hostdata->connected = NULL;
            hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
            hostdata->state = S_UNCONNECTED;
            if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
               cmd->SCp.Status = lun;
            if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
               cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
            else
               cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
            cmd->scsi_done(cmd);

/* We are no longer  connected to a target - check to see if
 * there are commands waiting to be executed.
 */
       restore_flags(flags);
            wd33c93_execute(instance);
            }
         else {
            printk("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",asr,sr,phs,cmd->pid);
            }
         break;


/* Note: this interrupt will occur only after a LEVEL2 command */

      case CSR_SDP:
DB(DB_INTR,printk("SDP"))
            hostdata->state = S_RUNNING_LEVEL2;
            write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
            write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
         break;


      case CSR_XFER_DONE|PHS_MESS_OUT:
      case CSR_UNEXP    |PHS_MESS_OUT:
      case CSR_SRV_REQ  |PHS_MESS_OUT:
DB(DB_INTR,printk("MSG_OUT="))

/* To get here, we've probably requested MESSAGE_OUT and have
 * already put the correct bytes in outgoing_msg[] and filled
 * in outgoing_len. We simply send them out to the SCSI bus.
 * Sometimes we get MESSAGE_OUT phase when we're not expecting
 * it - like when our SDTR message is rejected by a target. Some
 * targets send the REJECT before receiving all of the extended
 * message, and then seem to go back to MESSAGE_OUT for a byte
 * or two. Not sure why, or if I'm doing something wrong to
 * cause this to happen. Regardless, it seems that sending
 * NOP messages in these situations results in no harm and
 * makes everyone happy.
 */

         if (hostdata->outgoing_len == 0) {
            hostdata->outgoing_len = 1;
            hostdata->outgoing_msg[0] = NOP;
            }
         transfer_pio(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;
         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;
            return;
            }
DB(DB_INTR,printk("UNEXP_DISC-%ld",cmd->pid))
         hostdata->connected = NULL;
         hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
         hostdata->state = S_UNCONNECTED;
         if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
            cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
         else
            cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
         cmd->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() */
    restore_flags(flags);
         wd33c93_execute(instance);
         break;