ncr5380.c

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/**
 *	NCR5380_print	-	print scsi bus signals
 *	@instance:	adapter state to dump
 *
 *	Print the SCSI bus signals for debugging purposes
 *
 *	Locks: caller holds hostdata lock (not essential)
 */

static void NCR5380_print(struct Scsi_Host *instance)
{
	NCR5380_local_declare();
	unsigned char status, data, basr, mr, icr, i;
	NCR5380_setup(instance);

	data = NCR5380_read(CURRENT_SCSI_DATA_REG);
	status = NCR5380_read(STATUS_REG);
	mr = NCR5380_read(MODE_REG);
	icr = NCR5380_read(INITIATOR_COMMAND_REG);
	basr = NCR5380_read(BUS_AND_STATUS_REG);

	printk("STATUS_REG: %02x ", status);
	for (i = 0; signals[i].mask; ++i)
		if (status & signals[i].mask)
			printk(",%s", signals[i].name);
	printk("\nBASR: %02x ", basr);
	for (i = 0; basrs[i].mask; ++i)
		if (basr & basrs[i].mask)
			printk(",%s", basrs[i].name);
	printk("\nICR: %02x ", icr);
	for (i = 0; icrs[i].mask; ++i)
		if (icr & icrs[i].mask)
			printk(",%s", icrs[i].name);
	printk("\nMODE: %02x ", mr);
	for (i = 0; mrs[i].mask; ++i)
		if (mr & mrs[i].mask)
			printk(",%s", mrs[i].name);
	printk("\n");
}


/* 
 *	NCR5380_print_phase	-	show SCSI phase
 *	@instance: adapter to dump
 *
 * 	Print the current SCSI phase for debugging purposes
 *
 *	Locks: none
 */

static void NCR5380_print_phase(struct Scsi_Host *instance)
{
	NCR5380_local_declare();
	unsigned char status;
	int i;
	NCR5380_setup(instance);

	status = NCR5380_read(STATUS_REG);
	if (!(status & SR_REQ))
		printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
	else {
		for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
		printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
	}
}
#endif

/*
 * These need tweaking, and would probably work best as per-device 
 * flags initialized differently for disk, tape, cd, etc devices.
 * People with broken devices are free to experiment as to what gives
 * the best results for them.
 *
 * USLEEP_SLEEP should be a minimum seek time.
 *
 * USLEEP_POLL should be a maximum rotational latency.
 */
#ifndef USLEEP_SLEEP
/* 20 ms (reasonable hard disk speed) */
#define USLEEP_SLEEP (20*HZ/1000)
#endif
/* 300 RPM (floppy speed) */
#ifndef USLEEP_POLL
#define USLEEP_POLL (200*HZ/1000)
#endif
#ifndef USLEEP_WAITLONG
/* RvC: (reasonable time to wait on select error) */
#define USLEEP_WAITLONG USLEEP_SLEEP
#endif

/* 
 * Function : int should_disconnect (unsigned char cmd)
 *
 * Purpose : decide whether a command would normally disconnect or 
 *      not, since if it won't disconnect we should go to sleep.
 *
 * Input : cmd - opcode of SCSI command
 *
 * Returns : DISCONNECT_LONG if we should disconnect for a really long 
 *      time (ie always, sleep, look for REQ active, sleep), 
 *      DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
 *      time-to-data delay, DISCONNECT_NONE if this command would return
 *      immediately.
 *
 *      Future sleep algorithms based on time to data can exploit 
 *      something like this so they can differentiate between "normal" 
 *      (ie, read, write, seek) and unusual commands (ie, * format).
 *
 * Note : We don't deal with commands that handle an immediate disconnect,
 *        
 */

static int should_disconnect(unsigned char cmd)
{
	switch (cmd) {
	case READ_6:
	case WRITE_6:
	case SEEK_6:
	case READ_10:
	case WRITE_10:
	case SEEK_10:
		return DISCONNECT_TIME_TO_DATA;
	case FORMAT_UNIT:
	case SEARCH_HIGH:
	case SEARCH_LOW:
	case SEARCH_EQUAL:
		return DISCONNECT_LONG;
	default:
		return DISCONNECT_NONE;
	}
}

static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
{
	hostdata->time_expires = jiffies + timeout;
	schedule_delayed_work(&hostdata->coroutine, timeout);
}


static int probe_irq __initdata = 0;

/**
 *	probe_intr	-	helper for IRQ autoprobe
 *	@irq: interrupt number
 *	@dev_id: unused
 *	@regs: unused
 *
 *	Set a flag to indicate the IRQ in question was received. This is
 *	used by the IRQ probe code.
 */
 
static irqreturn_t __init probe_intr(int irq, void *dev_id)
{
	probe_irq = irq;
	return IRQ_HANDLED;
}

/**
 *	NCR5380_probe_irq	-	find the IRQ of an NCR5380
 *	@instance: NCR5380 controller
 *	@possible: bitmask of ISA IRQ lines
 *
 *	Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
 *	and then looking to see what interrupt actually turned up.
 *
 *	Locks: none, irqs must be enabled on entry
 */

static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
						int possible)
{
	NCR5380_local_declare();
	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
	unsigned long timeout;
	int trying_irqs, i, mask;
	NCR5380_setup(instance);

	for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
		if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0))
			trying_irqs |= mask;

	timeout = jiffies + (250 * HZ / 1000);
	probe_irq = SCSI_IRQ_NONE;

	/*
	 * A interrupt is triggered whenever BSY = false, SEL = true
	 * and a bit set in the SELECT_ENABLE_REG is asserted on the 
	 * SCSI bus.
	 *
	 * Note that the bus is only driven when the phase control signals
	 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
	 * to zero.
	 */

	NCR5380_write(TARGET_COMMAND_REG, 0);
	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);

	while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
		schedule_timeout_uninterruptible(1);
	
	NCR5380_write(SELECT_ENABLE_REG, 0);
	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);

	for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
		if (trying_irqs & mask)
			free_irq(i, NULL);

	return probe_irq;
}

/**
 *	NCR58380_print_options	-	show options
 *	@instance: unused for now
 *
 *	Called by probe code indicating the NCR5380 driver options that 
 *	were selected. At some point this will switch to runtime options
 *	read from the adapter in question
 *
 *	Locks: none
 */

static void __init __maybe_unused
NCR5380_print_options(struct Scsi_Host *instance)
{
	printk(" generic options"
#ifdef AUTOPROBE_IRQ
	       " AUTOPROBE_IRQ"
#endif
#ifdef AUTOSENSE
	       " AUTOSENSE"
#endif
#ifdef DIFFERENTIAL
	       " DIFFERENTIAL"
#endif
#ifdef REAL_DMA
	       " REAL DMA"
#endif
#ifdef REAL_DMA_POLL
	       " REAL DMA POLL"
#endif
#ifdef PARITY
	       " PARITY"
#endif
#ifdef PSEUDO_DMA
	       " PSEUDO DMA"
#endif
#ifdef UNSAFE
	       " UNSAFE "
#endif
	    );
	printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
	printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
	if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
		printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
	}
}

/**
 *	NCR5380_print_status 	-	dump controller info
 *	@instance: controller to dump
 *
 *	Print commands in the various queues, called from NCR5380_abort 
 *	and NCR5380_debug to aid debugging.
 *
 *	Locks: called functions disable irqs
 */

static void NCR5380_print_status(struct Scsi_Host *instance)
{
	NCR5380_dprint(NDEBUG_ANY, instance);
	NCR5380_dprint_phase(NDEBUG_ANY, instance);
}

/******************************************/
/*
 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
 *
 * *buffer: I/O buffer
 * **start: if inout == FALSE pointer into buffer where user read should start
 * offset: current offset
 * length: length of buffer
 * hostno: Scsi_Host host_no
 * inout: TRUE - user is writing; FALSE - user is reading
 *
 * Return the number of bytes read from or written
 */

#undef SPRINTF
#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
static
char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
static
char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
static
char *lprint_opcode(int opcode, char *pos, char *buffer, int length);

static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance,
	char *buffer, char **start, off_t offset, int length, int inout)
{
	char *pos = buffer;
	struct NCR5380_hostdata *hostdata;
	Scsi_Cmnd *ptr;

	hostdata = (struct NCR5380_hostdata *) instance->hostdata;

	if (inout) {		/* Has data been written to the file ? */
#ifdef DTC_PUBLIC_RELEASE
		dtc_wmaxi = dtc_maxi = 0;
#endif
#ifdef PAS16_PUBLIC_RELEASE
		pas_wmaxi = pas_maxi = 0;
#endif
		return (-ENOSYS);	/* Currently this is a no-op */
	}
	SPRINTF("NCR5380 core release=%d.   ", NCR5380_PUBLIC_RELEASE);
	if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
		SPRINTF("ncr53c400 release=%d.  ", NCR53C400_PUBLIC_RELEASE);
#ifdef DTC_PUBLIC_RELEASE
	SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
#endif
#ifdef T128_PUBLIC_RELEASE
	SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
#endif
#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
	SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
#endif
#ifdef PAS16_PUBLIC_RELEASE
	SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
#endif

	SPRINTF("\nBase Addr: 0x%05lX    ", (long) instance->base);
	SPRINTF("io_port: %04x      ", (int) instance->io_port);
	if (instance->irq == SCSI_IRQ_NONE)
		SPRINTF("IRQ: None.\n");
	else
		SPRINTF("IRQ: %d.\n", instance->irq);

#ifdef DTC_PUBLIC_RELEASE
	SPRINTF("Highwater I/O busy_spin_counts -- write: %d  read: %d\n", dtc_wmaxi, dtc_maxi);
#endif
#ifdef PAS16_PUBLIC_RELEASE
	SPRINTF("Highwater I/O busy_spin_counts -- write: %d  read: %d\n", pas_wmaxi, pas_maxi);
#endif
	spin_lock_irq(instance->host_lock);
	if (!hostdata->connected)
		SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
	else
		pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
	SPRINTF("scsi%d: issue_queue\n", instance->host_no);
	for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
		pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);

	SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
	for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
		pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
	spin_unlock_irq(instance->host_lock);
	
	*start = buffer;
	if (pos - buffer < offset)
		return 0;
	else if (pos - buffer - offset < length)
		return pos - buffer - offset;
	return length;
}

static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
{
	SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
	SPRINTF("        command = ");
	pos = lprint_command(cmd->cmnd, pos, buffer, length);
	return (pos);
}

static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
{
	int i, s;
	pos = lprint_opcode(command[0], pos, buffer, length);
	for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
		SPRINTF("%02x ", command[i]);
	SPRINTF("\n");
	return (pos);
}

static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
{
	SPRINTF("%2d (0x%02x)", opcode, opcode);
	return (pos);
}


/**
 *	NCR5380_init	-	initialise an NCR5380
 *	@instance: adapter to configure
 *	@flags: control flags
 *
 *	Initializes *instance and corresponding 5380 chip,
 *      with flags OR'd into the initial flags value.
 *
 *	Notes : I assume that the host, hostno, and id bits have been
 *      set correctly.  I don't care about the irq and other fields. 
 *
 *	Returns 0 for success
 *
 *	Locks: interrupts must be enabled when we are called 
 */