fd_mcs.c

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					FIFO_Size = 0x800;	/* 2k FIFO */

					printk("SECOND: chip=%s, fifo_size=0x%x\n", (chip == tmc18c30) ? "tmc18c30" : "tmc18c50", FIFO_Size);
				}
				/* *************************************************** */
#endif

				/* IBM/ANSI scsi scan ordering */
				/* Stick this back in when the scsi.c changes are there */
				shpnt->reverse_ordering = 1;


				/* saving info */
				hosts[found++] = shpnt;

				shpnt->this_id = id;
				shpnt->irq = irq;
				shpnt->io_port = port;
				shpnt->n_io_port = 0x10;

				/* save */
				bios_base = bios;
				adapter_mask = (1 << id);

				/* save more */
				SCSI_Mode_Cntl_port = port + SCSI_Mode_Cntl;
				FIFO_Data_Count_port = port + FIFO_Data_Count;
				Interrupt_Cntl_port = port + Interrupt_Cntl;
				Interrupt_Status_port = port + Interrupt_Status;
				Interrupt_Cond_port = port + Interrupt_Cond;
				Read_FIFO_port = port + Read_FIFO;
				Read_SCSI_Data_port = port + Read_SCSI_Data;
				SCSI_Cntl_port = port + SCSI_Cntl;
				SCSI_Data_NoACK_port = port + SCSI_Data_NoACK;
				SCSI_Status_port = port + SCSI_Status;
				TMC_Cntl_port = port + TMC_Cntl;
				TMC_Status_port = port + TMC_Status;
				Write_FIFO_port = port + Write_FIFO;
				Write_SCSI_Data_port = port + Write_SCSI_Data;

				Bytes_Read = 0;
				Bytes_Written = 0;
				INTR_Processed = 0;

				/* say something */
				print_banner(shpnt);

				/* reset */
				outb(1, SCSI_Cntl_port);
				do_pause(2);
				outb(0, SCSI_Cntl_port);
				do_pause(115);
				outb(0, SCSI_Mode_Cntl_port);
				outb(PARITY_MASK, TMC_Cntl_port);
				/* done reset */
			}
		}

		if (found == FD_MAX_HOSTS) {
			printk("fd_mcs: detecting reached max=%d host adapters.\n", FD_MAX_HOSTS);
			break;
		}
	}

	return found;
}

static const char *fd_mcs_info(struct Scsi_Host *shpnt)
{
	return adapter_name;
}

static int TOTAL_INTR = 0;

/*
 * inout : decides on the direction of the dataflow and the meaning of the 
 *         variables
 * buffer: If inout==FALSE data is being written to it else read from it
 * *start: If inout==FALSE start of the valid data in the buffer
 * offset: If inout==FALSE offset from the beginning of the imaginary file 
 *         from which we start writing into the buffer
 * length: If inout==FALSE max number of bytes to be written into the buffer 
 *         else number of bytes in the buffer
 */
static int fd_mcs_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout)
{
	int len = 0;

	if (inout)
		return (-ENOSYS);

	*start = buffer + offset;

	len += sprintf(buffer + len, "Future Domain MCS-600/700 Driver %s\n", DRIVER_VERSION);
	len += sprintf(buffer + len, "HOST #%d: %s\n", shpnt->host_no, adapter_name);
	len += sprintf(buffer + len, "FIFO Size=0x%x, FIFO Count=%d\n", FIFO_Size, FIFO_COUNT);
	len += sprintf(buffer + len, "DriverCalls=%d, Interrupts=%d, BytesRead=%d, BytesWrite=%d\n\n", TOTAL_INTR, INTR_Processed, Bytes_Read, Bytes_Written);

	if ((len -= offset) <= 0)
		return 0;
	if (len > length)
		len = length;
	return len;
}

static int fd_mcs_select(struct Scsi_Host *shpnt, int target)
{
	int status;
	unsigned long timeout;

	outb(0x82, SCSI_Cntl_port);	/* Bus Enable + Select */
	outb(adapter_mask | (1 << target), SCSI_Data_NoACK_port);

	/* Stop arbitration and enable parity */
	outb(PARITY_MASK, TMC_Cntl_port);

	timeout = 350;		/* 350mS -- because of timeouts
				   (was 250mS) */

	do {
		status = inb(SCSI_Status_port);	/* Read adapter status */
		if (status & 1) {	/* Busy asserted */
			/* Enable SCSI Bus (on error, should make bus idle with 0) */
			outb(0x80, SCSI_Cntl_port);
			return 0;
		}
		udelay(1000);	/* wait one msec */
	} while (--timeout);

	/* Make bus idle */
	fd_mcs_make_bus_idle(shpnt);
#if EVERY_ACCESS
	if (!target)
		printk("Selection failed\n");
#endif
#if ERRORS_ONLY
	if (!target) {
		static int flag = 0;

		if (!flag)	/* Skip first failure for all chips. */
			++flag;
		else
			printk("fd_mcs: Selection failed\n");
	}
#endif
	return 1;
}

static void my_done(struct Scsi_Host *shpnt, int error)
{
	if (in_command) {
		in_command = 0;
		outb(0x00, Interrupt_Cntl_port);
		fd_mcs_make_bus_idle(shpnt);
		current_SC->result = error;
		current_SC->scsi_done(current_SC);
	} else {
		panic("fd_mcs: my_done() called outside of command\n");
	}
#if DEBUG_RACE
	in_interrupt_flag = 0;
#endif
}

/* only my_done needs to be protected  */
static irqreturn_t fd_mcs_intr(int irq, void *dev_id)
{
	unsigned long flags;
	int status;
	int done = 0;
	unsigned data_count, tmp_count;

	int i = 0;
	struct Scsi_Host *shpnt;

	TOTAL_INTR++;

	/* search for one adapter-response on shared interrupt */
	while ((shpnt = hosts[i++])) {
		if ((inb(TMC_Status_port)) & 1)
			break;
	}

	/* return if some other device on this IRQ caused the interrupt */
	if (!shpnt) {
		return IRQ_NONE;
	}

	INTR_Processed++;

	outb(0x00, Interrupt_Cntl_port);

	/* Abort calls my_done, so we do nothing here. */
	if (current_SC->SCp.phase & aborted) {
#if DEBUG_ABORT
		printk("Interrupt after abort, ignoring\n");
#endif
		/* return IRQ_HANDLED; */
	}
#if DEBUG_RACE
	++in_interrupt_flag;
#endif

	if (current_SC->SCp.phase & in_arbitration) {
		status = inb(TMC_Status_port);	/* Read adapter status */
		if (!(status & 0x02)) {
#if EVERY_ACCESS
			printk(" AFAIL ");
#endif
			spin_lock_irqsave(shpnt->host_lock, flags);
			my_done(shpnt, DID_BUS_BUSY << 16);
			spin_unlock_irqrestore(shpnt->host_lock, flags);
			return IRQ_HANDLED;
		}
		current_SC->SCp.phase = in_selection;

		outb(0x40 | FIFO_COUNT, Interrupt_Cntl_port);

		outb(0x82, SCSI_Cntl_port);	/* Bus Enable + Select */
		outb(adapter_mask | (1 << scmd_id(current_SC)), SCSI_Data_NoACK_port);

		/* Stop arbitration and enable parity */
		outb(0x10 | PARITY_MASK, TMC_Cntl_port);
#if DEBUG_RACE
		in_interrupt_flag = 0;
#endif
		return IRQ_HANDLED;
	} else if (current_SC->SCp.phase & in_selection) {
		status = inb(SCSI_Status_port);
		if (!(status & 0x01)) {
			/* Try again, for slow devices */
			if (fd_mcs_select(shpnt, scmd_id(current_SC))) {
#if EVERY_ACCESS
				printk(" SFAIL ");
#endif
				spin_lock_irqsave(shpnt->host_lock, flags);
				my_done(shpnt, DID_NO_CONNECT << 16);
				spin_unlock_irqrestore(shpnt->host_lock, flags);
				return IRQ_HANDLED;
			} else {
#if EVERY_ACCESS
				printk(" AltSel ");
#endif
				/* Stop arbitration and enable parity */
				outb(0x10 | PARITY_MASK, TMC_Cntl_port);
			}
		}
		current_SC->SCp.phase = in_other;
		outb(0x90 | FIFO_COUNT, Interrupt_Cntl_port);
		outb(0x80, SCSI_Cntl_port);
#if DEBUG_RACE
		in_interrupt_flag = 0;
#endif
		return IRQ_HANDLED;
	}

	/* current_SC->SCp.phase == in_other: this is the body of the routine */

	status = inb(SCSI_Status_port);

	if (status & 0x10) {	/* REQ */

		switch (status & 0x0e) {

		case 0x08:	/* COMMAND OUT */
			outb(current_SC->cmnd[current_SC->SCp.sent_command++], Write_SCSI_Data_port);
#if EVERY_ACCESS
			printk("CMD = %x,", current_SC->cmnd[current_SC->SCp.sent_command - 1]);
#endif
			break;
		case 0x00:	/* DATA OUT -- tmc18c50/tmc18c30 only */
			if (chip != tmc1800 && !current_SC->SCp.have_data_in) {
				current_SC->SCp.have_data_in = -1;
				outb(0xd0 | PARITY_MASK, TMC_Cntl_port);
			}
			break;
		case 0x04:	/* DATA IN -- tmc18c50/tmc18c30 only */
			if (chip != tmc1800 && !current_SC->SCp.have_data_in) {
				current_SC->SCp.have_data_in = 1;
				outb(0x90 | PARITY_MASK, TMC_Cntl_port);
			}
			break;
		case 0x0c:	/* STATUS IN */
			current_SC->SCp.Status = inb(Read_SCSI_Data_port);
#if EVERY_ACCESS
			printk("Status = %x, ", current_SC->SCp.Status);
#endif
#if ERRORS_ONLY
			if (current_SC->SCp.Status && current_SC->SCp.Status != 2 && current_SC->SCp.Status != 8) {
				printk("ERROR fd_mcs: target = %d, command = %x, status = %x\n", current_SC->device->id, current_SC->cmnd[0], current_SC->SCp.Status);
			}
#endif
			break;
		case 0x0a:	/* MESSAGE OUT */
			outb(MESSAGE_REJECT, Write_SCSI_Data_port);	/* Reject */
			break;
		case 0x0e:	/* MESSAGE IN */
			current_SC->SCp.Message = inb(Read_SCSI_Data_port);
#if EVERY_ACCESS
			printk("Message = %x, ", current_SC->SCp.Message);
#endif
			if (!current_SC->SCp.Message)
				++done;
#if DEBUG_MESSAGES || EVERY_ACCESS
			if (current_SC->SCp.Message) {
				printk("fd_mcs: message = %x\n", current_SC->SCp.Message);
			}
#endif
			break;
		}
	}

	if (chip == tmc1800 && !current_SC->SCp.have_data_in && (current_SC->SCp.sent_command >= current_SC->cmd_len)) {
		/* We have to get the FIFO direction
		   correct, so I've made a table based
		   on the SCSI Standard of which commands
		   appear to require a DATA OUT phase.
		 */
		/*
		   p. 94: Command for all device types
		   CHANGE DEFINITION            40 DATA OUT
		   COMPARE                      39 DATA OUT
		   COPY                         18 DATA OUT
		   COPY AND VERIFY              3a DATA OUT
		   INQUIRY                      12 
		   LOG SELECT                   4c DATA OUT
		   LOG SENSE                    4d
		   MODE SELECT (6)              15 DATA OUT
		   MODE SELECT (10)             55 DATA OUT
		   MODE SENSE (6)               1a
		   MODE SENSE (10)              5a
		   READ BUFFER                  3c
		   RECEIVE DIAGNOSTIC RESULTS   1c
		   REQUEST SENSE                03
		   SEND DIAGNOSTIC              1d DATA OUT
		   TEST UNIT READY              00
		   WRITE BUFFER                 3b DATA OUT

		   p.178: Commands for direct-access devices (not listed on p. 94)
		   FORMAT UNIT                  04 DATA OUT
		   LOCK-UNLOCK CACHE            36
		   PRE-FETCH                    34
		   PREVENT-ALLOW MEDIUM REMOVAL 1e
		   READ (6)/RECEIVE             08
		   READ (10)                    3c
		   READ CAPACITY                25
		   READ DEFECT DATA (10)        37
		   READ LONG                    3e
		   REASSIGN BLOCKS              07 DATA OUT
		   RELEASE                      17
		   RESERVE                      16 DATA OUT
		   REZERO UNIT/REWIND           01
		   SEARCH DATA EQUAL (10)       31 DATA OUT
		   SEARCH DATA HIGH (10)        30 DATA OUT
		   SEARCH DATA LOW (10)         32 DATA OUT
		   SEEK (6)                     0b
		   SEEK (10)                    2b
		   SET LIMITS (10)              33
		   START STOP UNIT              1b
		   SYNCHRONIZE CACHE            35
		   VERIFY (10)                  2f
		   WRITE (6)/PRINT/SEND         0a DATA OUT
		   WRITE (10)/SEND              2a DATA OUT
		   WRITE AND VERIFY (10)        2e DATA OUT
		   WRITE LONG                   3f DATA OUT
		   WRITE SAME                   41 DATA OUT ?

		   p. 261: Commands for sequential-access devices (not previously listed)
		   ERASE                        19
		   LOAD UNLOAD                  1b
		   LOCATE                       2b
		   READ BLOCK LIMITS            05
		   READ POSITION                34
		   READ REVERSE                 0f
		   RECOVER BUFFERED DATA        14
		   SPACE                        11
		   WRITE FILEMARKS              10 ?

		   p. 298: Commands for printer devices (not previously listed)
		   ****** NOT SUPPORTED BY THIS DRIVER, since 0b is SEEK (6) *****
		   SLEW AND PRINT               0b DATA OUT  -- same as seek
		   STOP PRINT                   1b
		   SYNCHRONIZE BUFFER           10

		   p. 315: Commands for processor devices (not previously listed)

		   p. 321: Commands for write-once devices (not previously listed)
		   MEDIUM SCAN                  38
		   READ (12)                    a8
		   SEARCH DATA EQUAL (12)       b1 DATA OUT
		   SEARCH DATA HIGH (12)        b0 DATA OUT
		   SEARCH DATA LOW (12)         b2 DATA OUT
		   SET LIMITS (12)              b3
		   VERIFY (12)                  af
		   WRITE (12)                   aa DATA OUT
		   WRITE AND VERIFY (12)        ae DATA OUT

		   p. 332: Commands for CD-ROM devices (not previously listed)
		   PAUSE/RESUME                 4b
		   PLAY AUDIO (10)              45
		   PLAY AUDIO (12)              a5
		   PLAY AUDIO MSF               47
		   PLAY TRACK RELATIVE (10)     49
		   PLAY TRACK RELATIVE (12)     a9
		   READ HEADER                  44
		   READ SUB-CHANNEL             42
		   READ TOC                     43

		   p. 370: Commands for scanner devices (not previously listed)
		   GET DATA BUFFER STATUS       34
		   GET WINDOW                   25
		   OBJECT POSITION              31
		   SCAN                         1b
		   SET WINDOW                   24 DATA OUT

		   p. 391: Commands for optical memory devices (not listed)
		   ERASE (10)                   2c
		   ERASE (12)                   ac
		   MEDIUM SCAN                  38 DATA OUT
		   READ DEFECT DATA (12)        b7
		   READ GENERATION              29
		   READ UPDATED BLOCK           2d
		   UPDATE BLOCK                 3d DATA OUT

		   p. 419: Commands for medium changer devices (not listed)
		   EXCHANGE MEDIUM              46
		   INITIALIZE ELEMENT STATUS    07
		   MOVE MEDIUM                  a5
		   POSITION TO ELEMENT          2b
		   READ ELEMENT STATUS          b8
		   REQUEST VOL. ELEMENT ADDRESS b5
		   SEND VOLUME TAG              b6 DATA OUT

		   p. 454: Commands for communications devices (not listed previously)
		   GET MESSAGE (6)              08
		   GET MESSAGE (10)             28
		   GET MESSAGE (12)             a8
		 */

		switch (current_SC->cmnd[0]) {
		case CHANGE_DEFINITION:
		case COMPARE:
		case COPY:
		case COPY_VERIFY:
		case LOG_SELECT:
		case MODE_SELECT:
		case MODE_SELECT_10:
		case SEND_DIAGNOSTIC:
		case WRITE_BUFFER:

		case FORMAT_UNIT:
		case REASSIGN_BLOCKS:
		case RESERVE:
		case SEARCH_EQUAL:
		case SEARCH_HIGH:
		case SEARCH_LOW: