wd33c93.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,078 行 · 第 1/5 页

		/* From esp.c:
		 * There is a window of time within the scsi_done() path
		 * of execution where interrupts are turned back on full
		 * blast and left that way.  During that time we could
		 * reconnect to a disconnected command, then we'd bomb
		 * out below.  We could also end up executing two commands
		 * at _once_.  ...just so you know why the restore_flags()
		 * is here...
		 */

		spin_unlock_irqrestore(&hostdata->lock, flags);

/* We are not connected to a target - check to see if there
 * are commands waiting to be executed.
 */

		wd33c93_execute(instance);
		break;

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

	case CSR_SELECT:
		DB(DB_INTR, printk("SELECT"))
		    hostdata->connected = cmd =
		    (struct scsi_cmnd *) hostdata->selecting;
		hostdata->selecting = NULL;

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

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

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

			hostdata->sync_stat[cmd->device->id] = SS_WAITING;

/* Tack on a 2nd message to ask about synchronous transfers. If we've
 * been asked to do only asynchronous transfers on this device, we
 * request a fifo depth of 0, which is equivalent to async - should
 * solve the problems some people have had with GVP's Guru ROM.
 */

			hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
			hostdata->outgoing_msg[2] = 3;
			hostdata->outgoing_msg[3] = EXTENDED_SDTR;
			if (hostdata->no_sync & (1 << cmd->device->id)) {
				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;
		spin_unlock_irqrestore(&hostdata->lock, flags);
		break;

	case CSR_XFER_DONE | PHS_DATA_IN:
	case CSR_UNEXP | PHS_DATA_IN:
	case CSR_SRV_REQ | PHS_DATA_IN:
		DB(DB_INTR,
		   printk("IN-%d.%d", 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;
		spin_unlock_irqrestore(&hostdata->lock, flags);
		break;

	case CSR_XFER_DONE | PHS_DATA_OUT:
	case CSR_UNEXP | PHS_DATA_OUT:
	case CSR_SRV_REQ | PHS_DATA_OUT:
		DB(DB_INTR,
		   printk("OUT-%d.%d", 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;
		spin_unlock_irqrestore(&hostdata->lock, flags);
		break;

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

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

	case CSR_XFER_DONE | PHS_STATUS:
	case CSR_UNEXP | PHS_STATUS:
	case CSR_SRV_REQ | PHS_STATUS:
		DB(DB_INTR, printk("STATUS="))
		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;
		}
		spin_unlock_irqrestore(&hostdata->lock, flags);
		break;

	case CSR_XFER_DONE | PHS_MESS_IN:
	case CSR_UNEXP | PHS_MESS_IN:
	case CSR_SRV_REQ | PHS_MESS_IN:
		DB(DB_INTR, printk("MSG_IN="))

		msg = read_1_byte(regs);
		sr = read_wd33c93(regs, WD_SCSI_STATUS);	/* clear interrupt */

		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->device->id] == SS_WAITING)
				hostdata->sync_stat[cmd->device->id] = 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->device->id] !=
					    SS_WAITING) {

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

						write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
						hostdata->outgoing_msg[0] =
						    EXTENDED_MESSAGE;
						hostdata->outgoing_msg[1] = 3;
						hostdata->outgoing_msg[2] =
						    EXTENDED_SDTR;
						hostdata->outgoing_msg[3] =
						    hostdata->default_sx_per /
						    4;
						hostdata->outgoing_msg[4] = 0;
						hostdata->outgoing_len = 5;
						hostdata->sync_xfer[cmd->device->id] =
						    calc_sync_xfer(hostdata->
								   default_sx_per
								   / 4, 0);
					} else {
						hostdata->sync_xfer[cmd->device->id] = id;
					}
#ifdef SYNC_DEBUG
					printk("sync_xfer=%02x",
					       hostdata->sync_xfer[cmd->device->id]);
#endif
					hostdata->sync_stat[cmd->device->id] =
					    SS_SET;
					write_wd33c93_cmd(regs,
							  WD_CMD_NEGATE_ACK);
					hostdata->state = S_CONNECTED;
					break;
				case EXTENDED_WDTR:
					write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
					printk("sending WDTR ");
					hostdata->outgoing_msg[0] =
					    EXTENDED_MESSAGE;
					hostdata->outgoing_msg[1] = 2;
					hostdata->outgoing_msg[2] =
					    EXTENDED_WDTR;
					hostdata->outgoing_msg[3] = 0;	/* 8 bit transfer width */
					hostdata->outgoing_len = 4;
					write_wd33c93_cmd(regs,
							  WD_CMD_NEGATE_ACK);
					hostdata->state = S_CONNECTED;
					break;
				default:
					write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
					printk
					    ("Rejecting Unknown Extended Message(%02x). ",
					     ucp[2]);
					hostdata->outgoing_msg[0] =
					    MESSAGE_REJECT;
					hostdata->outgoing_len = 1;
					write_wd33c93_cmd(regs,
							  WD_CMD_NEGATE_ACK);
					hostdata->state = S_CONNECTED;
					break;
				}
				hostdata->incoming_ptr = 0;
			}

			/* We need to read more MESS_IN bytes for the extended message */

			else {
				hostdata->incoming_ptr++;
				write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
				hostdata->state = S_CONNECTED;
			}
			break;

		default:
			printk("Rejecting Unknown Message(%02x) ", msg);
			write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN);	/* want MESS_OUT */
			hostdata->outgoing_msg[0] = MESSAGE_REJECT;
			hostdata->outgoing_len = 1;
			write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
			hostdata->state = S_CONNECTED;
		}
		spin_unlock_irqrestore(&hostdata->lock, flags);
		break;

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

	case CSR_SEL_XFER_DONE:

/* Make sure that reselection is enabled at this point - it may
 * have been turned off for the command that just completed.
 */

		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
		if (phs == 0x60) {
			DB(DB_INTR, printk("SX-DONE-%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->device->id] &= ~(1 << cmd->device->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.
 */
			spin_unlock_irqrestore(&hostdata->lock, flags);
			wd33c93_execute(instance);
		} else {
			printk
			    ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
			     asr, sr, phs, cmd->pid);
			spin_unlock_irqrestore(&hostdata->lock, flags);
		}
		break;

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

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

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

/* To get here, we've probably requested MESSAGE_OUT and have
 * already put the correct bytes in outgoing_msg[] and filled
 * in outgoing_len. We simply send them out to the SCSI bus.
 * Sometimes we get MESSAGE_OUT phase when we're not expecting
 * it - like when our SDTR message is rejected by a target. Some
 * targets send the REJECT before receiving all of the extended
 * message, and then seem to go back to MESSAGE_OUT for a byte
 * or two. Not sure why, or if I'm doing something wrong to
 * cause this to happen. Regardless, it seems that sending
 * NOP messages in these situations results in no harm and
 * makes everyone happy.
 */
		    if (hostdata->outgoing_len == 0) {
			hostdata->outgoing_len = 1;
			hostdata->outgoing_msg[0] = NOP;
		}
		transfer_pio(regs, hostdata->outgoing_msg,
			     hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
		DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
		    hostdata->outgoing_len = 0;
		hostdata->state = S_CONNECTED;
		spin_unlock_irqrestore(&hostdata->lock, flags);
		break;

	case CSR_UNEXP_DISC:

/* I think I've seen this after a request-sense that was in response
 * to an error condition, but not sure. We certainly need to do
 * something when we get this interrupt - the question is 'what?'.
 * Let's think positively, and assume some command has finished
 * in a legal manner (like a command that provokes a request-sense),
 * so we treat it as a normal command-complete-disconnect.
 */

/* Make sure that reselection is enabled at this point - it may
 * have been turned off for the command that just completed.
 */

		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
		if (cmd == NULL) {
			printk(" - Already disconnected! ");
			hostdata->state = S_UNCONNECTED;
			spin_unlock_irqrestore(&hostdata->lock, flags);
			return;
		}
		DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid))
		    hostdata->connected = NULL;
		hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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() */
		spin_unlock_irqrestore(&hostdata->lock, flags);
		wd33c93_execute(instance);
		break;

	case CSR_DISC:

/* Make sure that reselection is enabled at this point - it may
 * have been turned off for the command that just completed.
 */

		write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
		DB(DB_INTR, printk("DISC-%ld", cmd->pid))
		    if (cmd == NULL) {
			printk(" - Already disconnected! ");
			hostdata->state = S_UNCONNECTED;