Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2862 insertions, 0 deletions

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
new file mode 100644
index 0000000..5e71a0b
--- /dev/null
+++ b/drivers/scsi/NCR5380.c
@@ -0,0 +1,2862 @@
+/* 
+ * NCR 5380 generic driver routines.  These should make it *trivial*
+ *      to implement 5380 SCSI drivers under Linux with a non-trantor
+ *      architecture.
+ *
+ *      Note that these routines also work with NR53c400 family chips.
+ *
+ * Copyright 1993, Drew Eckhardt
+ *      Visionary Computing 
+ *      (Unix and Linux consulting and custom programming)
+ *      drew@colorado.edu
+ *      +1 (303) 666-5836
+ *
+ * DISTRIBUTION RELEASE 6. 
+ *
+ * For more information, please consult 
+ *
+ * NCR 5380 Family
+ * SCSI Protocol Controller
+ * Databook
+ *
+ * NCR Microelectronics
+ * 1635 Aeroplaza Drive
+ * Colorado Springs, CO 80916
+ * 1+ (719) 578-3400
+ * 1+ (800) 334-5454
+ */
+
+/*
+ * $Log: NCR5380.c,v $
+
+ * Revision 1.10 1998/9/2	Alan Cox
+ *				(alan@redhat.com)
+ * Fixed up the timer lockups reported so far. Things still suck. Looking 
+ * forward to 2.3 and per device request queues. Then it'll be possible to
+ * SMP thread this beast and improve life no end.
+ 
+ * Revision 1.9  1997/7/27	Ronald van Cuijlenborg
+ *				(ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
+ * (hopefully) fixed and enhanced USLEEP
+ * added support for DTC3181E card (for Mustek scanner)
+ *
+
+ * Revision 1.8			Ingmar Baumgart
+ *				(ingmar@gonzo.schwaben.de)
+ * added support for NCR53C400a card
+ *
+
+ * Revision 1.7  1996/3/2       Ray Van Tassle (rayvt@comm.mot.com)
+ * added proc_info
+ * added support needed for DTC 3180/3280
+ * fixed a couple of bugs
+ *
+
+ * Revision 1.5  1994/01/19  09:14:57  drew
+ * Fixed udelay() hack that was being used on DATAOUT phases
+ * instead of a proper wait for the final handshake.
+ *
+ * Revision 1.4  1994/01/19  06:44:25  drew
+ * *** empty log message ***
+ *
+ * Revision 1.3  1994/01/19  05:24:40  drew
+ * Added support for TCR LAST_BYTE_SENT bit.
+ *
+ * Revision 1.2  1994/01/15  06:14:11  drew
+ * REAL DMA support, bug fixes.
+ *
+ * Revision 1.1  1994/01/15  06:00:54  drew
+ * Initial revision
+ *
+ */
+
+/*
+ * Further development / testing that should be done : 
+ * 1.  Cleanup the NCR5380_transfer_dma function and DMA operation complete
+ *     code so that everything does the same thing that's done at the 
+ *     end of a pseudo-DMA read operation.
+ *
+ * 2.  Fix REAL_DMA (interrupt driven, polled works fine) -
+ *     basically, transfer size needs to be reduced by one 
+ *     and the last byte read as is done with PSEUDO_DMA.
+ * 
+ * 4.  Test SCSI-II tagged queueing (I have no devices which support 
+ *      tagged queueing)
+ *
+ * 5.  Test linked command handling code after Eric is ready with 
+ *      the high level code.
+ */
+
+#if (NDEBUG & NDEBUG_LISTS)
+#define LIST(x,y) {printk("LINE:%d   Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
+#define REMOVE(w,x,y,z) {printk("LINE:%d   Removing: %p->%p  %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
+#else
+#define LIST(x,y)
+#define REMOVE(w,x,y,z)
+#endif
+
+#ifndef notyet
+#undef LINKED
+#undef REAL_DMA
+#endif
+
+#ifdef REAL_DMA_POLL
+#undef READ_OVERRUNS
+#define READ_OVERRUNS
+#endif
+
+#ifdef BOARD_REQUIRES_NO_DELAY
+#define io_recovery_delay(x)
+#else
+#define io_recovery_delay(x)	udelay(x)
+#endif
+
+/*
+ * Design
+ *
+ * This is a generic 5380 driver.  To use it on a different platform, 
+ * one simply writes appropriate system specific macros (ie, data
+ * transfer - some PC's will use the I/O bus, 68K's must use 
+ * memory mapped) and drops this file in their 'C' wrapper.
+ *
+ * (Note from hch:  unfortunately it was not enough for the different
+ * m68k folks and instead of improving this driver they copied it
+ * and hacked it up for their needs.  As a consequence they lost
+ * most updates to this driver.  Maybe someone will fix all these
+ * drivers to use a common core one day..)
+ *
+ * As far as command queueing, two queues are maintained for 
+ * each 5380 in the system - commands that haven't been issued yet,
+ * and commands that are currently executing.  This means that an 
+ * unlimited number of commands may be queued, letting 
+ * more commands propagate from the higher driver levels giving higher 
+ * throughput.  Note that both I_T_L and I_T_L_Q nexuses are supported, 
+ * allowing multiple commands to propagate all the way to a SCSI-II device 
+ * while a command is already executing.
+ *
+ *
+ * Issues specific to the NCR5380 : 
+ *
+ * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 
+ * piece of hardware that requires you to sit in a loop polling for 
+ * the REQ signal as long as you are connected.  Some devices are 
+ * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 
+ * while doing long seek operations.
+ * 
+ * The workaround for this is to keep track of devices that have
+ * disconnected.  If the device hasn't disconnected, for commands that
+ * should disconnect, we do something like 
+ *
+ * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
+ * 
+ * Some tweaking of N and M needs to be done.  An algorithm based 
+ * on "time to data" would give the best results as long as short time
+ * to datas (ie, on the same track) were considered, however these 
+ * broken devices are the exception rather than the rule and I'd rather
+ * spend my time optimizing for the normal case.
+ *
+ * Architecture :
+ *
+ * At the heart of the design is a coroutine, NCR5380_main,
+ * which is started from a workqueue for each NCR5380 host in the
+ * system.  It attempts to establish I_T_L or I_T_L_Q nexuses by
+ * removing the commands from the issue queue and calling
+ * NCR5380_select() if a nexus is not established. 
+ *
+ * Once a nexus is established, the NCR5380_information_transfer()
+ * phase goes through the various phases as instructed by the target.
+ * if the target goes into MSG IN and sends a DISCONNECT message,
+ * the command structure is placed into the per instance disconnected
+ * queue, and NCR5380_main tries to find more work.  If the target is 
+ * idle for too long, the system will try to sleep.
+ *
+ * If a command has disconnected, eventually an interrupt will trigger,
+ * calling NCR5380_intr()  which will in turn call NCR5380_reselect
+ * to reestablish a nexus.  This will run main if necessary.
+ *
+ * On command termination, the done function will be called as 
+ * appropriate.
+ *
+ * SCSI pointers are maintained in the SCp field of SCSI command 
+ * structures, being initialized after the command is connected
+ * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
+ * Note that in violation of the standard, an implicit SAVE POINTERS operation
+ * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
+ */
+
+/*
+ * Using this file :
+ * This file a skeleton Linux SCSI driver for the NCR 5380 series
+ * of chips.  To use it, you write an architecture specific functions 
+ * and macros and include this file in your driver.
+ *
+ * These macros control options : 
+ * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 
+ *      defined.
+ * 
+ * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
+ *      for commands that return with a CHECK CONDITION status. 
+ *
+ * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
+ *      transceivers. 
+ *
+ * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
+ *      override-configure an IRQ.
+ *
+ * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
+ *      bytes at a time.  Since interrupts are disabled by default during
+ *      these transfers, we might need this to give reasonable interrupt
+ *      service time if the transfer size gets too large.
+ *
+ * LINKED - if defined, linked commands are supported.
+ *
+ * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
+ *
+ * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
+ *
+ * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
+ *      rely on phase mismatch and EOP interrupts to determine end 
+ *      of phase.
+ *
+ * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.  You
+ *          only really want to use this if you're having a problem with
+ *          dropped characters during high speed communications, and even
+ *          then, you're going to be better off twiddling with transfersize
+ *          in the high level code.
+ *
+ * Defaults for these will be provided although the user may want to adjust 
+ * these to allocate CPU resources to the SCSI driver or "real" code.
+ * 
+ * USLEEP_SLEEP - amount of time, in jiffies, to sleep
+ *
+ * USLEEP_POLL - amount of time, in jiffies, to poll
+ *
+ * These macros MUST be defined :
+ * NCR5380_local_declare() - declare any local variables needed for your
+ *      transfer routines.
+ *
+ * NCR5380_setup(instance) - initialize any local variables needed from a given
+ *      instance of the host adapter for NCR5380_{read,write,pread,pwrite}
+ * 
+ * NCR5380_read(register)  - read from the specified register
+ *
+ * NCR5380_write(register, value) - write to the specific register 
+ *
+ * NCR5380_implementation_fields  - additional fields needed for this 
+ *      specific implementation of the NCR5380
+ *
+ * Either real DMA *or* pseudo DMA may be implemented
+ * REAL functions : 
+ * NCR5380_REAL_DMA should be defined if real DMA is to be used.
+ * Note that the DMA setup functions should return the number of bytes 
+ *      that they were able to program the controller for.
+ *
+ * Also note that generic i386/PC versions of these macros are 
+ *      available as NCR5380_i386_dma_write_setup,
+ *      NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
+ *
+ * NCR5380_dma_write_setup(instance, src, count) - initialize
+ * NCR5380_dma_read_setup(instance, dst, count) - initialize
+ * NCR5380_dma_residual(instance); - residual count
+ *
+ * PSEUDO functions :
+ * NCR5380_pwrite(instance, src, count)
+ * NCR5380_pread(instance, dst, count);
+ *
+ * The generic driver is initialized by calling NCR5380_init(instance),
+ * after setting the appropriate host specific fields and ID.  If the 
+ * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
+ * possible) function may be used.
+ */
+
+static int do_abort(struct Scsi_Host *host);
+static void do_reset(struct Scsi_Host *host);
+
+/*
+ *	initialize_SCp		-	init the scsi pointer field
+ *	@cmd: command block to set up
+ *
+ *	Set up the internal fields in the SCSI command.
+ */
+
+static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
+{
+	/* 
+	 * Initialize the Scsi Pointer field so that all of the commands in the 
+	 * various queues are valid.
+	 */
+
+	if (cmd->use_sg) {
+		cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
+		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+		cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
+			       cmd->SCp.buffer->offset;
+		cmd->SCp.this_residual = cmd->SCp.buffer->length;
+	} else {
+		cmd->SCp.buffer = NULL;
+		cmd->SCp.buffers_residual = 0;
+		cmd->SCp.ptr = (char *) cmd->request_buffer;
+		cmd->SCp.this_residual = cmd->request_bufflen;
+	}
+}
+
+/**
+ *	NCR5380_poll_politely	-	wait for NCR5380 status bits
+ *	@instance: controller to poll
+ *	@reg: 5380 register to poll
+ *	@bit: Bitmask to check
+ *	@val: Value required to exit
+ *
+ *	Polls the NCR5380 in a reasonably efficient manner waiting for
+ *	an event to occur, after a short quick poll we begin giving the
+ *	CPU back in non IRQ contexts
+ *
+ *	Returns the value of the register or a negative error code.
+ */
+ 
+static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
+{
+	NCR5380_local_declare();
+	int n = 500;		/* At about 8uS a cycle for the cpu access */
+	unsigned long end = jiffies + t;
+	int r;
+	
+	NCR5380_setup(instance);
+
+	while( n-- > 0)
+	{
+		r = NCR5380_read(reg);
+		if((r & bit) == val)
+			return 0;
+		cpu_relax();
+	}
+	
+	/* t time yet ? */
+	while(time_before(jiffies, end))
+	{
+		r = NCR5380_read(reg);
+		if((r & bit) == val)
+			return 0;
+		if(!in_interrupt())
+			yield();
+		else
+			cpu_relax();
+	}
+	return -ETIMEDOUT;
+}
+
+static struct {
+	unsigned char value;
+	const char *name;
+} phases[] = {
+	{PHASE_DATAOUT, "DATAOUT"}, 
+	{PHASE_DATAIN, "DATAIN"}, 
+	{PHASE_CMDOUT, "CMDOUT"}, 
+	{PHASE_STATIN, "STATIN"}, 
+	{PHASE_MSGOUT, "MSGOUT"}, 
+	{PHASE_MSGIN, "MSGIN"}, 
+	{PHASE_UNKNOWN, "UNKNOWN"}
+};
+
+#ifdef NDEBUG
+static struct {
+	unsigned char mask;
+	const char *name;
+} signals[] = { 
+	{SR_DBP, "PARITY"}, 
+	{SR_RST, "RST"}, 
+	{SR_BSY, "BSY"}, 
+	{SR_REQ, "REQ"}, 
+	{SR_MSG, "MSG"}, 
+	{SR_CD, "CD"}, 
+	{SR_IO, "IO"}, 
+	{SR_SEL, "SEL"}, 
+	{0, NULL}
+}, 
+basrs[] = {
+	{BASR_ATN, "ATN"}, 
+	{BASR_ACK, "ACK"}, 
+	{0, NULL}
+}, 
+icrs[] = { 
+	{ICR_ASSERT_RST, "ASSERT RST"}, 
+	{ICR_ASSERT_ACK, "ASSERT ACK"}, 
+	{ICR_ASSERT_BSY, "ASSERT BSY"}, 
+	{ICR_ASSERT_SEL, "ASSERT SEL"}, 
+	{ICR_ASSERT_ATN, "ASSERT ATN"}, 
+	{ICR_ASSERT_DATA, "ASSERT DATA"}, 
+	{0, NULL}
+}, 
+mrs[] = { 
+	{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 
+	{MR_TARGET, "MODE TARGET"}, 
+	{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 
+	{MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 
+	{MR_MONITOR_BSY, "MODE MONITOR BSY"}, 
+	{MR_DMA_MODE, "MODE DMA"}, 
+	{MR_ARBITRATE, "MODE ARBITRATION"}, 
+	{0, NULL}
+};
+
+/**
+ *	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 weather 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,
+					struct pt_regs *regs)
+{
+	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 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, SA_INTERRUPT, "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))
+	{
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(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 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 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 
+ */
+
+static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
+{
+	NCR5380_local_declare();
+	int i, pass;
+	unsigned long timeout;
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+	if(in_interrupt())
+		printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
+	/* 
+	 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 
+	 * the base address.
+	 */
+
+#ifdef NCR53C400
+	if (flags & FLAG_NCR53C400)
+		instance->NCR5380_instance_name += NCR53C400_address_adjust;
+#endif
+
+	NCR5380_setup(instance);
+
+	hostdata->aborted = 0;
+	hostdata->id_mask = 1 << instance->this_id;
+	for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
+		if (i > hostdata->id_mask)
+			hostdata->id_higher_mask |= i;
+	for (i = 0; i < 8; ++i)
+		hostdata->busy[i] = 0;
+#ifdef REAL_DMA
+	hostdata->dmalen = 0;
+#endif
+	hostdata->targets_present = 0;
+	hostdata->connected = NULL;
+	hostdata->issue_queue = NULL;
+	hostdata->disconnected_queue = NULL;
+	
+	INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata);
+	
+#ifdef NCR5380_STATS
+	for (i = 0; i < 8; ++i) {
+		hostdata->time_read[i] = 0;
+		hostdata->time_write[i] = 0;
+		hostdata->bytes_read[i] = 0;
+		hostdata->bytes_write[i] = 0;
+	}
+	hostdata->timebase = 0;
+	hostdata->pendingw = 0;
+	hostdata->pendingr = 0;
+#endif
+
+	/* The CHECK code seems to break the 53C400. Will check it later maybe */
+	if (flags & FLAG_NCR53C400)
+		hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
+	else
+		hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
+
+	hostdata->host = instance;
+	hostdata->time_expires = 0;
+
+#ifndef AUTOSENSE
+	if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
+		    printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" "         without AUTOSENSE option, contingent allegiance conditions may\n"
+		    	   "         be incorrectly cleared.\n", instance->host_no);
+#endif				/* def AUTOSENSE */
+
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+	NCR5380_write(MODE_REG, MR_BASE);
+	NCR5380_write(TARGET_COMMAND_REG, 0);
+	NCR5380_write(SELECT_ENABLE_REG, 0);
+
+#ifdef NCR53C400
+	if (hostdata->flags & FLAG_NCR53C400) {
+		NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
+	}
+#endif
+
+	/* 
+	 * Detect and correct bus wedge problems.
+	 *
+	 * If the system crashed, it may have crashed in a state 
+	 * where a SCSI command was still executing, and the 
+	 * SCSI bus is not in a BUS FREE STATE.
+	 *
+	 * If this is the case, we'll try to abort the currently
+	 * established nexus which we know nothing about, and that
+	 * failing, do a hard reset of the SCSI bus 
+	 */
+
+	for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
+		switch (pass) {
+		case 1:
+		case 3:
+		case 5:
+			printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
+			timeout = jiffies + 5 * HZ;
+			NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
+			break;
+		case 2:
+			printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
+			do_abort(instance);
+			break;
+		case 4:
+			printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
+			do_reset(instance);
+			break;
+		case 6:
+			printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
+			return -ENXIO;
+		}
+	}
+	return 0;
+}
+
+/**
+ *	NCR5380_exit	-	remove an NCR5380
+ *	@instance: adapter to remove
+ */
+
+static void __devexit NCR5380_exit(struct Scsi_Host *instance)
+{
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+	cancel_delayed_work(&hostdata->coroutine);
+	flush_scheduled_work();
+}
+
+/**
+ *	NCR5380_queue_command 		-	queue a command
+ *	@cmd: SCSI command
+ *	@done: completion handler
+ *
+ *      cmd is added to the per instance issue_queue, with minor 
+ *      twiddling done to the host specific fields of cmd.  If the 
+ *      main coroutine is not running, it is restarted.
+ *
+ *	Locks: host lock taken by caller
+ */
+
+static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 
+{
+	struct Scsi_Host *instance = cmd->device->host;
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+	Scsi_Cmnd *tmp;
+
+#if (NDEBUG & NDEBUG_NO_WRITE)
+	switch (cmd->cmnd[0]) {
+	case WRITE_6:
+	case WRITE_10:
+		printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
+		cmd->result = (DID_ERROR << 16);
+		done(cmd);
+		return 0;
+	}
+#endif				/* (NDEBUG & NDEBUG_NO_WRITE) */
+
+#ifdef NCR5380_STATS
+	switch (cmd->cmnd[0]) {
+		case WRITE:
+		case WRITE_6:
+		case WRITE_10:
+			hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
+			hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
+			hostdata->pendingw++;
+			break;
+		case READ:
+		case READ_6:
+		case READ_10:
+			hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
+			hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
+			hostdata->pendingr++;
+			break;
+	}
+#endif
+
+	/* 
+	 * We use the host_scribble field as a pointer to the next command  
+	 * in a queue 
+	 */
+
+	cmd->host_scribble = NULL;
+	cmd->scsi_done = done;
+	cmd->result = 0;
+
+	/* 
+	 * Insert the cmd into the issue queue. Note that REQUEST SENSE 
+	 * commands are added to the head of the queue since any command will
+	 * clear the contingent allegiance condition that exists and the 
+	 * sense data is only guaranteed to be valid while the condition exists.
+	 */
+
+	if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
+		LIST(cmd, hostdata->issue_queue);
+		cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
+		hostdata->issue_queue = cmd;
+	} else {
+		for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
+		LIST(cmd, tmp);
+		tmp->host_scribble = (unsigned char *) cmd;
+	}
+	dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
+
+	/* Run the coroutine if it isn't already running. */
+	/* Kick off command processing */
+	schedule_work(&hostdata->coroutine);
+	return 0;
+}
+
+
+/**
+ *	NCR5380_main	-	NCR state machines
+ *
+ *	NCR5380_main is a coroutine that runs as long as more work can 
+ *      be done on the NCR5380 host adapters in a system.  Both 
+ *      NCR5380_queue_command() and NCR5380_intr() will try to start it 
+ *      in case it is not running.
+ * 
+ *	Locks: called as its own thread with no locks held. Takes the
+ *	host lock and called routines may take the isa dma lock.
+ */
+
+static void NCR5380_main(void *p)
+{
+	struct NCR5380_hostdata *hostdata = p;
+	struct Scsi_Host *instance = hostdata->host;
+	Scsi_Cmnd *tmp, *prev;
+	int done;
+	
+	spin_lock_irq(instance->host_lock);
+	do {
+		/* Lock held here */
+		done = 1;
+		if (!hostdata->connected && !hostdata->selecting) {
+			dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
+			/*
+			 * Search through the issue_queue for a command destined
+			 * for a target that's not busy.
+			 */
+			for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 
+			{
+				if (prev != tmp)
+					dprintk(NDEBUG_LISTS, ("MAIN tmp=%p   target=%d   busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
+				/*  When we find one, remove it from the issue queue. */
+				if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
+					if (prev) {
+						REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
+						prev->host_scribble = tmp->host_scribble;
+					} else {
+						REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
+						hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
+					}
+					tmp->host_scribble = NULL;
+
+					/* 
+					 * Attempt to establish an I_T_L nexus here. 
+					 * On success, instance->hostdata->connected is set.
+					 * On failure, we must add the command back to the
+					 *   issue queue so we can keep trying. 
+					 */
+					dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun));
+	
+					/*
+					 * A successful selection is defined as one that 
+					 * leaves us with the command connected and 
+					 * in hostdata->connected, OR has terminated the
+					 * command.
+					 *
+					 * With successful commands, we fall through
+					 * and see if we can do an information transfer,
+					 * with failures we will restart.
+					 */
+					hostdata->selecting = NULL;
+					/* RvC: have to preset this to indicate a new command is being performed */
+
+					if (!NCR5380_select(instance, tmp,
+							    /* 
+							     * REQUEST SENSE commands are issued without tagged
+							     * queueing, even on SCSI-II devices because the 
+							     * contingent allegiance condition exists for the 
+							     * entire unit.
+							     */
+							    (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
+						break;
+					} else {
+						LIST(tmp, hostdata->issue_queue);
+						tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
+						hostdata->issue_queue = tmp;
+						done = 0;
+						dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
+					}
+					/* lock held here still */
+				}	/* if target/lun is not busy */
+			}	/* for */
+			/* exited locked */
+		}	/* if (!hostdata->connected) */
+		if (hostdata->selecting) {
+			tmp = (Scsi_Cmnd *) hostdata->selecting;
+			/* Selection will drop and retake the lock */
+			if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
+				/* Ok ?? */
+			} else {
+				/* RvC: device failed, so we wait a long time
+				   this is needed for Mustek scanners, that
+				   do not respond to commands immediately
+				   after a scan */
+				printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
+				LIST(tmp, hostdata->issue_queue);
+				tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
+				hostdata->issue_queue = tmp;
+				NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
+			}
+		}	/* if hostdata->selecting */
+		if (hostdata->connected
+#ifdef REAL_DMA
+		    && !hostdata->dmalen
+#endif
+		    && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
+		    ) {
+			dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
+			NCR5380_information_transfer(instance);
+			dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
+			done = 0;
+		} else
+			break;
+	} while (!done);
+	
+	spin_unlock_irq(instance->host_lock);
+}
+
+#ifndef DONT_USE_INTR
+
+/**
+ * 	NCR5380_intr	-	generic NCR5380 irq handler
+ *	@irq: interrupt number
+ *	@dev_id: device info
+ *	@regs: registers (unused)
+ *
+ *	Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
+ *      from the disconnected queue, and restarting NCR5380_main() 
+ *      as required.
+ *
+ *	Locks: takes the needed instance locks
+ */
+
+static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) 
+{
+	NCR5380_local_declare();
+	struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+	int done;
+	unsigned char basr;
+	unsigned long flags;
+
+	dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq));
+
+	do {
+		done = 1;
+		spin_lock_irqsave(instance->host_lock, flags);
+		/* Look for pending interrupts */
+		NCR5380_setup(instance);
+		basr = NCR5380_read(BUS_AND_STATUS_REG);
+		/* XXX dispatch to appropriate routine if found and done=0 */
+		if (basr & BASR_IRQ) {
+			NCR5380_dprint(NDEBUG_INTR, instance);
+			if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
+				done = 0;
+				dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
+				NCR5380_reselect(instance);
+				(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+			} else if (basr & BASR_PARITY_ERROR) {
+				dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
+				(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+			} else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
+				dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
+				(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+			} else {
+#if defined(REAL_DMA)
+				/*
+				 * We should only get PHASE MISMATCH and EOP interrupts
+				 * if we have DMA enabled, so do a sanity check based on
+				 * the current setting of the MODE register.
+				 */
+
+				if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
+					int transfered;
+
+					if (!hostdata->connected)
+						panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
+
+					transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
+					hostdata->connected->SCp.this_residual -= transferred;
+					hostdata->connected->SCp.ptr += transferred;
+					hostdata->dmalen = 0;
+
+					(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+							
+					/* FIXME: we need to poll briefly then defer a workqueue task ! */
+					NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
+
+					NCR5380_write(MODE_REG, MR_BASE);
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+				}
+#else
+				dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)));
+				(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+#endif
+			}
+		}	/* if BASR_IRQ */
+		spin_unlock_irqrestore(instance->host_lock, flags);
+		if(!done)
+			schedule_work(&hostdata->coroutine);
+	} while (!done);
+	return IRQ_HANDLED;
+}
+
+#endif 
+
+/**
+ *	collect_stats		-	collect stats on a scsi command
+ *	@hostdata: adapter 
+ *	@cmd: command being issued
+ *
+ *	Update the statistical data by parsing the command in question
+ */
+ 
+static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 
+{
+#ifdef NCR5380_STATS
+	switch (cmd->cmnd[0]) {
+	case WRITE:
+	case WRITE_6:
+	case WRITE_10:
+		hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
+		hostdata->pendingw--;
+		break;
+	case READ:
+	case READ_6:
+	case READ_10:
+		hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
+		hostdata->pendingr--;
+		break;
+	}
+#endif
+}
+
+
+/* 
+ * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 
+ *      int tag);
+ *
+ * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
+ *      including ARBITRATION, SELECTION, and initial message out for 
+ *      IDENTIFY and queue messages. 
+ *
+ * Inputs : instance - instantiation of the 5380 driver on which this 
+ *      target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 
+ *      new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 
+ *      the command that is presently connected.
+ * 
+ * Returns : -1 if selection could not execute for some reason,
+ *      0 if selection succeeded or failed because the target 
+ *      did not respond.
+ *
+ * Side effects : 
+ *      If bus busy, arbitration failed, etc, NCR5380_select() will exit 
+ *              with registers as they should have been on entry - ie
+ *              SELECT_ENABLE will be set appropriately, the NCR5380
+ *              will cease to drive any SCSI bus signals.
+ *
+ *      If successful : I_T_L or I_T_L_Q nexus will be established, 
+ *              instance->connected will be set to cmd.  
+ *              SELECT interrupt will be disabled.
+ *
+ *      If failed (no target) : cmd->scsi_done() will be called, and the 
+ *              cmd->result host byte set to DID_BAD_TARGET.
+ *
+ *	Locks: caller holds hostdata lock in IRQ mode
+ */
+ 
+static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 
+{
+	NCR5380_local_declare();
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+	unsigned char tmp[3], phase;
+	unsigned char *data;
+	int len;
+	unsigned long timeout;
+	unsigned char value;
+	int err;
+	NCR5380_setup(instance);
+
+	if (hostdata->selecting)
+		goto part2;
+
+	hostdata->restart_select = 0;
+
+	NCR5380_dprint(NDEBUG_ARBITRATION, instance);
+	dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
+
+	/* 
+	 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 
+	 * data bus during SELECTION.
+	 */
+
+	NCR5380_write(TARGET_COMMAND_REG, 0);
+
+	/* 
+	 * Start arbitration.
+	 */
+
+	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+	NCR5380_write(MODE_REG, MR_ARBITRATE);
+
+
+	/* We can be relaxed here, interrupts are on, we are
+	   in workqueue context, the birds are singing in the trees */
+	spin_unlock_irq(instance->host_lock);
+	err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
+	spin_lock_irq(instance->host_lock);
+	if (err < 0) {
+		printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
+		NCR5380_write(MODE_REG, MR_BASE);
+		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+		goto failed;
+	}
+
+	dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
+
+	/* 
+	 * The arbitration delay is 2.2us, but this is a minimum and there is 
+	 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
+	 * the integral nature of udelay().
+	 *
+	 */
+
+	udelay(3);
+
+	/* Check for lost arbitration */
+	if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
+		NCR5380_write(MODE_REG, MR_BASE);
+		dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
+		goto failed;
+	}
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
+
+	if (!(hostdata->flags & FLAG_DTC3181E) &&
+	    /* RvC: DTC3181E has some trouble with this
+	     *      so we simply removed it. Seems to work with
+	     *      only Mustek scanner attached
+	     */
+	    (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
+		NCR5380_write(MODE_REG, MR_BASE);
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+		dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
+		goto failed;
+	}
+	/* 
+	 * Again, bus clear + bus settle time is 1.2us, however, this is 
+	 * a minimum so we'll udelay ceil(1.2)
+	 */
+
+	udelay(2);
+
+	dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
+
+	/* 
+	 * Now that we have won arbitration, start Selection process, asserting 
+	 * the host and target ID's on the SCSI bus.
+	 */
+
+	NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
+
+	/* 
+	 * Raise ATN while SEL is true before BSY goes false from arbitration,
+	 * since this is the only way to guarantee that we'll get a MESSAGE OUT
+	 * phase immediately after selection.
+	 */
+
+	NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
+	NCR5380_write(MODE_REG, MR_BASE);
+
+	/* 
+	 * Reselect interrupts must be turned off prior to the dropping of BSY,
+	 * otherwise we will trigger an interrupt.
+	 */
+	NCR5380_write(SELECT_ENABLE_REG, 0);
+
+	/*
+	 * The initiator shall then wait at least two deskew delays and release 
+	 * the BSY signal.
+	 */
+	udelay(1);		/* wingel -- wait two bus deskew delay >2*45ns */
+
+	/* Reset BSY */
+	NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
+
+	/* 
+	 * Something weird happens when we cease to drive BSY - looks
+	 * like the board/chip is letting us do another read before the 
+	 * appropriate propagation delay has expired, and we're confusing
+	 * a BSY signal from ourselves as the target's response to SELECTION.
+	 *
+	 * A small delay (the 'C++' frontend breaks the pipeline with an
+	 * unnecessary jump, making it work on my 386-33/Trantor T128, the
+	 * tighter 'C' code breaks and requires this) solves the problem - 
+	 * the 1 us delay is arbitrary, and only used because this delay will 
+	 * be the same on other platforms and since it works here, it should 
+	 * work there.
+	 *
+	 * wingel suggests that this could be due to failing to wait
+	 * one deskew delay.
+	 */
+
+	udelay(1);
+
+	dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, cmd->device->id));
+
+	/* 
+	 * The SCSI specification calls for a 250 ms timeout for the actual 
+	 * selection.
+	 */
+
+	timeout = jiffies + (250 * HZ / 1000);
+
+	/* 
+	 * XXX very interesting - we're seeing a bounce where the BSY we 
+	 * asserted is being reflected / still asserted (propagation delay?)
+	 * and it's detecting as true.  Sigh.
+	 */
+
+	hostdata->select_time = 0;	/* we count the clock ticks at which we polled */
+	hostdata->selecting = cmd;
+
+part2:
+	/* RvC: here we enter after a sleeping period, or immediately after
+	   execution of part 1
+	   we poll only once ech clock tick */
+	value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
+
+	if (!value && (hostdata->select_time < HZ/4)) {
+		/* RvC: we still must wait for a device response */
+		hostdata->select_time++;	/* after 25 ticks the device has failed */
+		NCR5380_set_timer(hostdata, 1);
+		return 0;	/* RvC: we return here with hostdata->selecting set,
+				   to go to sleep */
+	}
+
+	hostdata->selecting = NULL;/* clear this pointer, because we passed the
+					   waiting period */
+	if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+		NCR5380_reselect(instance);
+		printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
+		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+		return -1;
+	}
+	/* 
+	 * No less than two deskew delays after the initiator detects the 
+	 * BSY signal is true, it shall release the SEL signal and may 
+	 * change the DATA BUS.                                     -wingel
+	 */
+
+	udelay(1);
+
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+
+	if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+		if (hostdata->targets_present & (1 << cmd->device->id)) {
+			printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
+			if (hostdata->restart_select)
+				printk(KERN_DEBUG "\trestart select\n");
+			NCR5380_dprint(NDEBUG_SELECTION, instance);
+			NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+			return -1;
+		}
+		cmd->result = DID_BAD_TARGET << 16;
+		collect_stats(hostdata, cmd);
+		cmd->scsi_done(cmd);
+		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+		dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
+		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+		return 0;
+	}
+	hostdata->targets_present |= (1 << cmd->device->id);
+
+	/*
+	 * Since we followed the SCSI spec, and raised ATN while SEL 
+	 * was true but before BSY was false during selection, the information
+	 * transfer phase should be a MESSAGE OUT phase so that we can send the
+	 * IDENTIFY message.
+	 * 
+	 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
+	 * message (2 bytes) with a tag ID that we increment with every command
+	 * until it wraps back to 0.
+	 *
+	 * XXX - it turns out that there are some broken SCSI-II devices,
+	 *       which claim to support tagged queuing but fail when more than
+	 *       some number of commands are issued at once.
+	 */
+
+	/* Wait for start of REQ/ACK handshake */
+
+	spin_unlock_irq(instance->host_lock);
+	err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
+	spin_lock_irq(instance->host_lock);
+	
+	if(err) {
+		printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
+		NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+		goto failed;
+	}
+
+	dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
+	tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
+
+	len = 1;
+	cmd->tag = 0;
+
+	/* Send message(s) */
+	data = tmp;
+	phase = PHASE_MSGOUT;
+	NCR5380_transfer_pio(instance, &phase, &len, &data);
+	dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
+	/* XXX need to handle errors here */
+	hostdata->connected = cmd;
+	hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
+
+	if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
+		initialize_SCp(cmd);
+	}
+
+	return 0;
+
+	/* Selection failed */
+failed:
+	return -1;
+
+}
+
+/* 
+ * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 
+ *      unsigned char *phase, int *count, unsigned char **data)
+ *
+ * Purpose : transfers data in given phase using polled I/O
+ *
+ * Inputs : instance - instance of driver, *phase - pointer to 
+ *      what phase is expected, *count - pointer to number of 
+ *      bytes to transfer, **data - pointer to data pointer.
+ * 
+ * Returns : -1 when different phase is entered without transferring
+ *      maximum number of bytes, 0 if all bytes or transfered or exit
+ *      is in same phase.
+ *
+ *      Also, *phase, *count, *data are modified in place.
+ *
+ * XXX Note : handling for bus free may be useful.
+ */
+
+/*
+ * Note : this code is not as quick as it could be, however it 
+ * IS 100% reliable, and for the actual data transfer where speed
+ * counts, we will always do a pseudo DMA or DMA transfer.
+ */
+
+static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
+	NCR5380_local_declare();
+	unsigned char p = *phase, tmp;
+	int c = *count;
+	unsigned char *d = *data;
+	/*
+	 *      RvC: some administrative data to process polling time
+	 */
+	int break_allowed = 0;
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+	NCR5380_setup(instance);
+
+	if (!(p & SR_IO))
+		dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
+	else
+		dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
+
+	/* 
+	 * The NCR5380 chip will only drive the SCSI bus when the 
+	 * phase specified in the appropriate bits of the TARGET COMMAND
+	 * REGISTER match the STATUS REGISTER
+	 */
+
+	 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+
+	/* RvC: don't know if this is necessary, but other SCSI I/O is short
+	 *      so breaks are not necessary there
+	 */
+	if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
+		break_allowed = 1;
+	}
+	do {
+		/* 
+		 * Wait for assertion of REQ, after which the phase bits will be 
+		 * valid 
+		 */
+
+		/* RvC: we simply poll once, after that we stop temporarily
+		 *      and let the device buffer fill up
+		 *      if breaking is not allowed, we keep polling as long as needed
+		 */
+
+		/* FIXME */
+		while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
+		if (!(tmp & SR_REQ)) {
+			/* timeout condition */
+			NCR5380_set_timer(hostdata, USLEEP_SLEEP);
+			break;
+		}
+
+		dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
+
+		/* Check for phase mismatch */
+		if ((tmp & PHASE_MASK) != p) {
+			dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
+			NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
+			break;
+		}
+		/* Do actual transfer from SCSI bus to / from memory */
+		if (!(p & SR_IO))
+			NCR5380_write(OUTPUT_DATA_REG, *d);
+		else
+			*d = NCR5380_read(CURRENT_SCSI_DATA_REG);
+
+		++d;
+
+		/* 
+		 * The SCSI standard suggests that in MSGOUT phase, the initiator
+		 * should drop ATN on the last byte of the message phase
+		 * after REQ has been asserted for the handshake but before
+		 * the initiator raises ACK.
+		 */
+
+		if (!(p & SR_IO)) {
+			if (!((p & SR_MSG) && c > 1)) {
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
+				NCR5380_dprint(NDEBUG_PIO, instance);
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
+			} else {
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
+				NCR5380_dprint(NDEBUG_PIO, instance);
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+			}
+		} else {
+			NCR5380_dprint(NDEBUG_PIO, instance);
+			NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
+		}
+
+		/* FIXME - if this fails bus reset ?? */
+		NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
+		dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
+
+/*
+ * We have several special cases to consider during REQ/ACK handshaking : 
+ * 1.  We were in MSGOUT phase, and we are on the last byte of the 
+ *      message.  ATN must be dropped as ACK is dropped.
+ *
+ * 2.  We are in a MSGIN phase, and we are on the last byte of the  
+ *      message.  We must exit with ACK asserted, so that the calling
+ *      code may raise ATN before dropping ACK to reject the message.
+ *
+ * 3.  ACK and ATN are clear and the target may proceed as normal.
+ */
+		if (!(p == PHASE_MSGIN && c == 1)) {
+			if (p == PHASE_MSGOUT && c > 1)
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+			else
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+		}
+	} while (--c);
+
+	dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
+
+	*count = c;
+	*data = d;
+	tmp = NCR5380_read(STATUS_REG);
+	if (tmp & SR_REQ)
+		*phase = tmp & PHASE_MASK;
+	else
+		*phase = PHASE_UNKNOWN;
+
+	if (!c || (*phase == p))
+		return 0;
+	else
+		return -1;
+}
+
+/**
+ *	do_reset	-	issue a reset command
+ *	@host: adapter to reset
+ *
+ *	Issue a reset sequence to the NCR5380 and try and get the bus
+ *	back into sane shape.
+ *
+ *	Locks: caller holds queue lock
+ */
+ 
+static void do_reset(struct Scsi_Host *host) {
+	NCR5380_local_declare();
+	NCR5380_setup(host);
+
+	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
+	udelay(25);
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+}
+
+/*
+ * Function : do_abort (Scsi_Host *host)
+ * 
+ * Purpose : abort the currently established nexus.  Should only be 
+ *      called from a routine which can drop into a 
+ * 
+ * Returns : 0 on success, -1 on failure.
+ *
+ * Locks: queue lock held by caller
+ *	FIXME: sort this out and get new_eh running
+ */
+
+static int do_abort(struct Scsi_Host *host) {
+	NCR5380_local_declare();
+	unsigned char *msgptr, phase, tmp;
+	int len;
+	int rc;
+	NCR5380_setup(host);
+
+
+	/* Request message out phase */
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+
+	/* 
+	 * Wait for the target to indicate a valid phase by asserting 
+	 * REQ.  Once this happens, we'll have either a MSGOUT phase 
+	 * and can immediately send the ABORT message, or we'll have some 
+	 * other phase and will have to source/sink data.
+	 * 
+	 * We really don't care what value was on the bus or what value
+	 * the target sees, so we just handshake.
+	 */
+
+	rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
+	
+	if(rc < 0)
+		return -1;
+
+	tmp = (unsigned char)rc;
+	
+	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
+
+	if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+		rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+		if(rc == -1)
+			return -1;
+	}
+	tmp = ABORT;
+	msgptr = &tmp;
+	len = 1;
+	phase = PHASE_MSGOUT;
+	NCR5380_transfer_pio(host, &phase, &len, &msgptr);
+
+	/*
+	 * If we got here, and the command completed successfully,
+	 * we're about to go into bus free state.
+	 */
+
+	return len ? -1 : 0;
+}
+
+#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
+/* 
+ * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 
+ *      unsigned char *phase, int *count, unsigned char **data)
+ *
+ * Purpose : transfers data in given phase using either real
+ *      or pseudo DMA.
+ *
+ * Inputs : instance - instance of driver, *phase - pointer to 
+ *      what phase is expected, *count - pointer to number of 
+ *      bytes to transfer, **data - pointer to data pointer.
+ * 
+ * Returns : -1 when different phase is entered without transferring
+ *      maximum number of bytes, 0 if all bytes or transfered or exit
+ *      is in same phase.
+ *
+ *      Also, *phase, *count, *data are modified in place.
+ *
+ *	Locks: io_request lock held by caller
+ */
+
+
+static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
+	NCR5380_local_declare();
+	register int c = *count;
+	register unsigned char p = *phase;
+	register unsigned char *d = *data;
+	unsigned char tmp;
+	int foo;
+#if defined(REAL_DMA_POLL)
+	int cnt, toPIO;
+	unsigned char saved_data = 0, overrun = 0, residue;
+#endif
+
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+
+	NCR5380_setup(instance);
+
+	if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
+		*phase = tmp;
+		return -1;
+	}
+#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
+#ifdef READ_OVERRUNS
+	if (p & SR_IO) {
+		c -= 2;
+	}
+#endif
+	dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d));
+	hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
+#endif
+
+	NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+
+#ifdef REAL_DMA
+	NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
+#elif defined(REAL_DMA_POLL)
+	NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
+#else
+	/*
+	 * Note : on my sample board, watch-dog timeouts occurred when interrupts
+	 * were not disabled for the duration of a single DMA transfer, from 
+	 * before the setting of DMA mode to after transfer of the last byte.
+	 */
+
+#if defined(PSEUDO_DMA) && defined(UNSAFE)
+	spin_unlock_irq(instance->host_lock);
+#endif
+	/* KLL May need eop and parity in 53c400 */
+	if (hostdata->flags & FLAG_NCR53C400)
+		NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY);
+	else
+		NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
+#endif				/* def REAL_DMA */
+
+	dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
+
+	/* 
+	 *	On the PAS16 at least I/O recovery delays are not needed here.
+	 *	Everyone else seems to want them.
+	 */
+
+	if (p & SR_IO) {
+		io_recovery_delay(1);
+		NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
+	} else {
+		io_recovery_delay(1);
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
+		io_recovery_delay(1);
+		NCR5380_write(START_DMA_SEND_REG, 0);
+		io_recovery_delay(1);
+	}
+
+#if defined(REAL_DMA_POLL)
+	do {
+		tmp = NCR5380_read(BUS_AND_STATUS_REG);
+	} while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
+
+/*
+   At this point, either we've completed DMA, or we have a phase mismatch,
+   or we've unexpectedly lost BUSY (which is a real error).
+
+   For write DMAs, we want to wait until the last byte has been
+   transferred out over the bus before we turn off DMA mode.  Alas, there
+   seems to be no terribly good way of doing this on a 5380 under all
+   conditions.  For non-scatter-gather operations, we can wait until REQ
+   and ACK both go false, or until a phase mismatch occurs.  Gather-writes
+   are nastier, since the device will be expecting more data than we
+   are prepared to send it, and REQ will remain asserted.  On a 53C8[01] we
+   could test LAST BIT SENT to assure transfer (I imagine this is precisely
+   why this signal was added to the newer chips) but on the older 538[01]
+   this signal does not exist.  The workaround for this lack is a watchdog;
+   we bail out of the wait-loop after a modest amount of wait-time if
+   the usual exit conditions are not met.  Not a terribly clean or
+   correct solution :-%
+
+   Reads are equally tricky due to a nasty characteristic of the NCR5380.
+   If the chip is in DMA mode for an READ, it will respond to a target's
+   REQ by latching the SCSI data into the INPUT DATA register and asserting
+   ACK, even if it has _already_ been notified by the DMA controller that
+   the current DMA transfer has completed!  If the NCR5380 is then taken
+   out of DMA mode, this already-acknowledged byte is lost.
+
+   This is not a problem for "one DMA transfer per command" reads, because
+   the situation will never arise... either all of the data is DMA'ed
+   properly, or the target switches to MESSAGE IN phase to signal a
+   disconnection (either operation bringing the DMA to a clean halt).
+   However, in order to handle scatter-reads, we must work around the
+   problem.  The chosen fix is to DMA N-2 bytes, then check for the
+   condition before taking the NCR5380 out of DMA mode.  One or two extra
+   bytes are transferred via PIO as necessary to fill out the original
+   request.
+ */
+
+	if (p & SR_IO) {
+#ifdef READ_OVERRUNS
+		udelay(10);
+		if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
+			saved_data = NCR5380_read(INPUT_DATA_REGISTER);
+			overrun = 1;
+		}
+#endif
+	} else {
+		int limit = 100;
+		while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
+			if (!(tmp & BASR_PHASE_MATCH))
+				break;
+			if (--limit < 0)
+				break;
+		}
+	}
+
+	dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
+
+	NCR5380_write(MODE_REG, MR_BASE);
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+	residue = NCR5380_dma_residual(instance);
+	c -= residue;
+	*count -= c;
+	*data += c;
+	*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
+
+#ifdef READ_OVERRUNS
+	if (*phase == p && (p & SR_IO) && residue == 0) {
+		if (overrun) {
+			dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
+			**data = saved_data;
+			*data += 1;
+			*count -= 1;
+			cnt = toPIO = 1;
+		} else {
+			printk("No overrun??\n");
+			cnt = toPIO = 2;
+		}
+		dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
+		NCR5380_transfer_pio(instance, phase, &cnt, data);
+		*count -= toPIO - cnt;
+	}
+#endif
+
+	dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count)));
+	return 0;
+
+#elif defined(REAL_DMA)
+	return 0;
+#else				/* defined(REAL_DMA_POLL) */
+	if (p & SR_IO) {
+#ifdef DMA_WORKS_RIGHT
+		foo = NCR5380_pread(instance, d, c);
+#else
+		int diff = 1;
+		if (hostdata->flags & FLAG_NCR53C400) {
+			diff = 0;
+		}
+		if (!(foo = NCR5380_pread(instance, d, c - diff))) {
+			/*
+			 * We can't disable DMA mode after successfully transferring 
+			 * what we plan to be the last byte, since that would open up
+			 * a race condition where if the target asserted REQ before 
+			 * we got the DMA mode reset, the NCR5380 would have latched
+			 * an additional byte into the INPUT DATA register and we'd
+			 * have dropped it.
+			 * 
+			 * The workaround was to transfer one fewer bytes than we 
+			 * intended to with the pseudo-DMA read function, wait for 
+			 * the chip to latch the last byte, read it, and then disable
+			 * pseudo-DMA mode.
+			 * 
+			 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
+			 * REQ is deasserted when ACK is asserted, and not reasserted
+			 * until ACK goes false.  Since the NCR5380 won't lower ACK
+			 * until DACK is asserted, which won't happen unless we twiddle
+			 * the DMA port or we take the NCR5380 out of DMA mode, we 
+			 * can guarantee that we won't handshake another extra 
+			 * byte.
+			 */
+
+			if (!(hostdata->flags & FLAG_NCR53C400)) {
+				while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
+				/* Wait for clean handshake */
+				while (NCR5380_read(STATUS_REG) & SR_REQ);
+				d[c - 1] = NCR5380_read(INPUT_DATA_REG);
+			}
+		}
+#endif
+	} else {
+#ifdef DMA_WORKS_RIGHT
+		foo = NCR5380_pwrite(instance, d, c);
+#else
+		int timeout;
+		dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
+		if (!(foo = NCR5380_pwrite(instance, d, c))) {
+			/*
+			 * Wait for the last byte to be sent.  If REQ is being asserted for 
+			 * the byte we're interested, we'll ACK it and it will go false.  
+			 */
+			if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
+				timeout = 20000;
+				while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
+
+				if (!timeout)
+					dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
+
+				if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
+					hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
+					if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
+						hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
+						dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
+					}
+				}
+			} else {
+				dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
+				while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
+				dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
+			}
+		}
+#endif
+	}
+	NCR5380_write(MODE_REG, MR_BASE);
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+	if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
+		dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
+		if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
+			dprintk(NDEBUG_C400_PWRITE, ("53C400w:    got it, reading reset interrupt reg\n"));
+			NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+		} else {
+			printk("53C400w:    IRQ NOT THERE!\n");
+		}
+	}
+	*data = d + c;
+	*count = 0;
+	*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
+#if defined(PSEUDO_DMA) && defined(UNSAFE)
+	spin_lock_irq(instance->host_lock);
+#endif				/* defined(REAL_DMA_POLL) */
+	return foo;
+#endif				/* def REAL_DMA */
+}
+#endif				/* defined(REAL_DMA) | defined(PSEUDO_DMA) */
+
+/*
+ * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
+ *
+ * Purpose : run through the various SCSI phases and do as the target 
+ *      directs us to.  Operates on the currently connected command, 
+ *      instance->connected.
+ *
+ * Inputs : instance, instance for which we are doing commands
+ *
+ * Side effects : SCSI things happen, the disconnected queue will be 
+ *      modified if a command disconnects, *instance->connected will
+ *      change.
+ *
+ * XXX Note : we need to watch for bus free or a reset condition here 
+ *      to recover from an unexpected bus free condition.
+ *
+ * Locks: io_request_lock held by caller in IRQ mode
+ */
+
+static void NCR5380_information_transfer(struct Scsi_Host *instance) {
+	NCR5380_local_declare();
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
+	unsigned char msgout = NOP;
+	int sink = 0;
+	int len;
+#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
+	int transfersize;
+#endif
+	unsigned char *data;
+	unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
+	Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
+	/* RvC: we need to set the end of the polling time */
+	unsigned long poll_time = jiffies + USLEEP_POLL;
+
+	NCR5380_setup(instance);
+
+	while (1) {
+		tmp = NCR5380_read(STATUS_REG);
+		/* We only have a valid SCSI phase when REQ is asserted */
+		if (tmp & SR_REQ) {
+			phase = (tmp & PHASE_MASK);
+			if (phase != old_phase) {
+				old_phase = phase;
+				NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
+			}
+			if (sink && (phase != PHASE_MSGOUT)) {
+				NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
+
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+				while (NCR5380_read(STATUS_REG) & SR_REQ);
+				NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+				sink = 0;
+				continue;
+			}
+			switch (phase) {
+			case PHASE_DATAIN:
+			case PHASE_DATAOUT:
+#if (NDEBUG & NDEBUG_NO_DATAOUT)
+				printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
+				sink = 1;
+				do_abort(instance);
+				cmd->result = DID_ERROR << 16;
+				cmd->done(cmd);
+				return;
+#endif
+				/* 
+				 * If there is no room left in the current buffer in the
+				 * scatter-gather list, move onto the next one.
+				 */
+
+				if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
+					++cmd->SCp.buffer;
+					--cmd->SCp.buffers_residual;
+					cmd->SCp.this_residual = cmd->SCp.buffer->length;
+					cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
+						       cmd->SCp.buffer->offset;
+					dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
+				}
+				/*
+				 * The preferred transfer method is going to be 
+				 * PSEUDO-DMA for systems that are strictly PIO,
+				 * since we can let the hardware do the handshaking.
+				 *
+				 * For this to work, we need to know the transfersize
+				 * ahead of time, since the pseudo-DMA code will sit
+				 * in an unconditional loop.
+				 */
+
+#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
+				/* KLL
+				 * PSEUDO_DMA is defined here. If this is the g_NCR5380
+				 * driver then it will always be defined, so the
+				 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
+				 * NCR5380 case.  I think this is a fairly clean solution.
+				 * We supplement these 2 if's with the flag.
+				 */
+#ifdef NCR5380_dma_xfer_len
+				if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
+#else
+				transfersize = cmd->transfersize;
+
+#ifdef LIMIT_TRANSFERSIZE	/* If we have problems with interrupt service */
+				if (transfersize > 512)
+					transfersize = 512;
+#endif				/* LIMIT_TRANSFERSIZE */
+
+				if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
+					/* Limit transfers to 32K, for xx400 & xx406
+					 * pseudoDMA that transfers in 128 bytes blocks. */
+					if (transfersize > 32 * 1024)
+						transfersize = 32 * 1024;
+#endif
+					len = transfersize;
+					if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
+						/*
+						 * If the watchdog timer fires, all future accesses to this
+						 * device will use the polled-IO.
+						 */
+						printk("scsi%d : switching target %d lun %d to slow handshake\n", instance->host_no, cmd->device->id, cmd->device->lun);
+						cmd->device->borken = 1;
+						NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+						sink = 1;
+						do_abort(instance);
+						cmd->result = DID_ERROR << 16;
+						cmd->done(cmd);
+						/* XXX - need to source or sink data here, as appropriate */
+					} else
+						cmd->SCp.this_residual -= transfersize - len;
+				} else
+#endif				/* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
+					NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
+							     &cmd->SCp.ptr);
+				break;
+			case PHASE_MSGIN:
+				len = 1;
+				data = &tmp;
+				NCR5380_transfer_pio(instance, &phase, &len, &data);
+				cmd->SCp.Message = tmp;
+
+				switch (tmp) {
+					/*
+					 * Linking lets us reduce the time required to get the 
+					 * next command out to the device, hopefully this will
+					 * mean we don't waste another revolution due to the delays
+					 * required by ARBITRATION and another SELECTION.
+					 *
+					 * In the current implementation proposal, low level drivers
+					 * merely have to start the next command, pointed to by 
+					 * next_link, done() is called as with unlinked commands.
+					 */
+#ifdef LINKED
+				case LINKED_CMD_COMPLETE:
+				case LINKED_FLG_CMD_COMPLETE:
+					/* Accept message by clearing ACK */
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+					dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
+					/* 
+					 * Sanity check : A linked command should only terminate with
+					 * one of these messages if there are more linked commands
+					 * available.
+					 */
+					if (!cmd->next_link) {
+						printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
+						sink = 1;
+						do_abort(instance);
+						return;
+					}
+					initialize_SCp(cmd->next_link);
+					/* The next command is still part of this process */
+					cmd->next_link->tag = cmd->tag;
+					cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+					dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun));
+					collect_stats(hostdata, cmd);
+					cmd->scsi_done(cmd);
+					cmd = hostdata->connected;
+					break;
+#endif				/* def LINKED */
+				case ABORT:
+				case COMMAND_COMPLETE:
+					/* Accept message by clearing ACK */
+					sink = 1;
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+					hostdata->connected = NULL;
+					dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
+					hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+
+					/* 
+					 * I'm not sure what the correct thing to do here is : 
+					 * 
+					 * If the command that just executed is NOT a request 
+					 * sense, the obvious thing to do is to set the result
+					 * code to the values of the stored parameters.
+					 * 
+					 * If it was a REQUEST SENSE command, we need some way 
+					 * to differentiate between the failure code of the original
+					 * and the failure code of the REQUEST sense - the obvious
+					 * case is success, where we fall through and leave the result
+					 * code unchanged.
+					 * 
+					 * The non-obvious place is where the REQUEST SENSE failed 
+					 */
+
+					if (cmd->cmnd[0] != REQUEST_SENSE)
+						cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+					else if (status_byte(cmd->SCp.Status) != GOOD)
+						cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
+
+#ifdef AUTOSENSE
+					if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
+						dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
+						cmd->cmnd[0] = REQUEST_SENSE;
+						cmd->cmnd[1] &= 0xe0;
+						cmd->cmnd[2] = 0;
+						cmd->cmnd[3] = 0;
+						cmd->cmnd[4] = sizeof(cmd->sense_buffer);
+						cmd->cmnd[5] = 0;
+
+						cmd->SCp.buffer = NULL;
+						cmd->SCp.buffers_residual = 0;
+						cmd->SCp.ptr = (char *) cmd->sense_buffer;
+						cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
+
+						LIST(cmd, hostdata->issue_queue);
+						cmd->host_scribble = (unsigned char *)
+						    hostdata->issue_queue;
+						hostdata->issue_queue = (Scsi_Cmnd *) cmd;
+						dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
+					} else
+#endif				/* def AUTOSENSE */
+					{
+						collect_stats(hostdata, cmd);
+						cmd->scsi_done(cmd);
+					}
+
+					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+					/* 
+					 * Restore phase bits to 0 so an interrupted selection, 
+					 * arbitration can resume.
+					 */
+					NCR5380_write(TARGET_COMMAND_REG, 0);
+
+					while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+						barrier();
+					return;
+				case MESSAGE_REJECT:
+					/* Accept message by clearing ACK */
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+					switch (hostdata->last_message) {
+					case HEAD_OF_QUEUE_TAG:
+					case ORDERED_QUEUE_TAG:
+					case SIMPLE_QUEUE_TAG:
+						cmd->device->simple_tags = 0;
+						hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
+						break;
+					default:
+						break;
+					}
+				case DISCONNECT:{
+						/* Accept message by clearing ACK */
+						NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+						cmd->device->disconnect = 1;
+						LIST(cmd, hostdata->disconnected_queue);
+						cmd->host_scribble = (unsigned char *)
+						    hostdata->disconnected_queue;
+						hostdata->connected = NULL;
+						hostdata->disconnected_queue = cmd;
+						dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" "  the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun));
+						/* 
+						 * Restore phase bits to 0 so an interrupted selection, 
+						 * arbitration can resume.
+						 */
+						NCR5380_write(TARGET_COMMAND_REG, 0);
+
+						/* Enable reselect interrupts */
+						NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+						/* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
+						/* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
+						while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+							barrier();
+						return;
+					}
+					/* 
+					 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
+					 * operation, in violation of the SCSI spec so we can safely 
+					 * ignore SAVE/RESTORE pointers calls.
+					 *
+					 * Unfortunately, some disks violate the SCSI spec and 
+					 * don't issue the required SAVE_POINTERS message before
+					 * disconnecting, and we have to break spec to remain 
+					 * compatible.
+					 */
+				case SAVE_POINTERS:
+				case RESTORE_POINTERS:
+					/* Accept message by clearing ACK */
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+					break;
+				case EXTENDED_MESSAGE:
+/* 
+ * Extended messages are sent in the following format :
+ * Byte         
+ * 0            EXTENDED_MESSAGE == 1
+ * 1            length (includes one byte for code, doesn't 
+ *              include first two bytes)
+ * 2            code
+ * 3..length+1  arguments
+ *
+ * Start the extended message buffer with the EXTENDED_MESSAGE
+ * byte, since print_msg() wants the whole thing.  
+ */
+					extended_msg[0] = EXTENDED_MESSAGE;
+					/* Accept first byte by clearing ACK */
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+					dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
+
+					len = 2;
+					data = extended_msg + 1;
+					phase = PHASE_MSGIN;
+					NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+					dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
+
+					if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
+						/* Accept third byte by clearing ACK */
+						NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+						len = extended_msg[1] - 1;
+						data = extended_msg + 3;
+						phase = PHASE_MSGIN;
+
+						NCR5380_transfer_pio(instance, &phase, &len, &data);
+						dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
+
+						switch (extended_msg[2]) {
+						case EXTENDED_SDTR:
+						case EXTENDED_WDTR:
+						case EXTENDED_MODIFY_DATA_POINTER:
+						case EXTENDED_EXTENDED_IDENTIFY:
+							tmp = 0;
+						}
+					} else if (len) {
+						printk("scsi%d: error receiving extended message\n", instance->host_no);
+						tmp = 0;
+					} else {
+						printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
+						tmp = 0;
+					}
+					/* Fall through to reject message */
+
+					/* 
+					 * If we get something weird that we aren't expecting, 
+					 * reject it.
+					 */
+				default:
+					if (!tmp) {
+						printk("scsi%d: rejecting message ", instance->host_no);
+						print_msg(extended_msg);
+						printk("\n");
+					} else if (tmp != EXTENDED_MESSAGE)
+						printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n", instance->host_no, tmp, cmd->device->id, cmd->device->lun);
+					else
+						printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n", instance->host_no, extended_msg[1], extended_msg[0], cmd->device->id, cmd->device->lun);
+
+					msgout = MESSAGE_REJECT;
+					NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+					break;
+				}	/* switch (tmp) */
+				break;
+			case PHASE_MSGOUT:
+				len = 1;
+				data = &msgout;
+				hostdata->last_message = msgout;
+				NCR5380_transfer_pio(instance, &phase, &len, &data);
+				if (msgout == ABORT) {
+					hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+					hostdata->connected = NULL;
+					cmd->result = DID_ERROR << 16;
+					collect_stats(hostdata, cmd);
+					cmd->scsi_done(cmd);
+					NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+					return;
+				}
+				msgout = NOP;
+				break;
+			case PHASE_CMDOUT:
+				len = cmd->cmd_len;
+				data = cmd->cmnd;
+				/* 
+				 * XXX for performance reasons, on machines with a 
+				 * PSEUDO-DMA architecture we should probably 
+				 * use the dma transfer function.  
+				 */
+				NCR5380_transfer_pio(instance, &phase, &len, &data);
+				if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
+					NCR5380_set_timer(hostdata, USLEEP_SLEEP);
+					dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
+					return;
+				}
+				break;
+			case PHASE_STATIN:
+				len = 1;
+				data = &tmp;
+				NCR5380_transfer_pio(instance, &phase, &len, &data);
+				cmd->SCp.Status = tmp;
+				break;
+			default:
+				printk("scsi%d : unknown phase\n", instance->host_no);
+				NCR5380_dprint(NDEBUG_ALL, instance);
+			}	/* switch(phase) */
+		}		/* if (tmp * SR_REQ) */
+		else {
+			/* RvC: go to sleep if polling time expired
+			 */
+			if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
+				NCR5380_set_timer(hostdata, USLEEP_SLEEP);
+				dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
+				return;
+			}
+		}
+	}			/* while (1) */
+}
+
+/*
+ * Function : void NCR5380_reselect (struct Scsi_Host *instance)
+ *
+ * Purpose : does reselection, initializing the instance->connected 
+ *      field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 
+ *      nexus has been reestablished,
+ *      
+ * Inputs : instance - this instance of the NCR5380.
+ *
+ * Locks: io_request_lock held by caller if IRQ driven
+ */
+
+static void NCR5380_reselect(struct Scsi_Host *instance) {
+	NCR5380_local_declare();
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+	 instance->hostdata;
+	unsigned char target_mask;
+	unsigned char lun, phase;
+	int len;
+	unsigned char msg[3];
+	unsigned char *data;
+	Scsi_Cmnd *tmp = NULL, *prev;
+	int abort = 0;
+	NCR5380_setup(instance);
+
+	/*
+	 * Disable arbitration, etc. since the host adapter obviously
+	 * lost, and tell an interrupted NCR5380_select() to restart.
+	 */
+
+	NCR5380_write(MODE_REG, MR_BASE);
+	hostdata->restart_select = 1;
+
+	target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
+	dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
+
+	/* 
+	 * At this point, we have detected that our SCSI ID is on the bus,
+	 * SEL is true and BSY was false for at least one bus settle delay
+	 * (400 ns).
+	 *
+	 * We must assert BSY ourselves, until the target drops the SEL
+	 * signal.
+	 */
+
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
+
+	/* FIXME: timeout too long, must fail to workqueue */	
+	if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
+		abort = 1;
+		
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+	/*
+	 * Wait for target to go into MSGIN.
+	 * FIXME: timeout needed and fail to work queeu
+	 */
+
+	if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
+		abort = 1;
+
+	len = 1;
+	data = msg;
+	phase = PHASE_MSGIN;
+	NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+	if (!(msg[0] & 0x80)) {
+		printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
+		print_msg(msg);
+		abort = 1;
+	} else {
+		/* Accept message by clearing ACK */
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+		lun = (msg[0] & 0x07);
+
+		/* 
+		 * We need to add code for SCSI-II to track which devices have
+		 * I_T_L_Q nexuses established, and which have simple I_T_L
+		 * nexuses so we can chose to do additional data transfer.
+		 */
+
+		/* 
+		 * Find the command corresponding to the I_T_L or I_T_L_Q  nexus we 
+		 * just reestablished, and remove it from the disconnected queue.
+		 */
+
+
+		for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
+			if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
+			    ) {
+				if (prev) {
+					REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
+					prev->host_scribble = tmp->host_scribble;
+				} else {
+					REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
+					hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
+				}
+				tmp->host_scribble = NULL;
+				break;
+			}
+		if (!tmp) {
+			printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
+			/* 
+			 * Since we have an established nexus that we can't do anything with,
+			 * we must abort it.  
+			 */
+			abort = 1;
+		}
+	}
+
+	if (abort) {
+		do_abort(instance);
+	} else {
+		hostdata->connected = tmp;
+		dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
+	}
+}
+
+/*
+ * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
+ *
+ * Purpose : called by interrupt handler when DMA finishes or a phase
+ *      mismatch occurs (which would finish the DMA transfer).  
+ *
+ * Inputs : instance - this instance of the NCR5380.
+ *
+ * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
+ *      nexus has been reestablished, on failure NULL is returned.
+ */
+
+#ifdef REAL_DMA
+static void NCR5380_dma_complete(NCR5380_instance * instance) {
+	NCR5380_local_declare();
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata);
+	int transferred;
+	NCR5380_setup(instance);
+
+	/*
+	 * XXX this might not be right.
+	 *
+	 * Wait for final byte to transfer, ie wait for ACK to go false.
+	 *
+	 * We should use the Last Byte Sent bit, unfortunately this is 
+	 * not available on the 5380/5381 (only the various CMOS chips)
+	 *
+	 * FIXME: timeout, and need to handle long timeout/irq case
+	 */
+
+	NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
+
+	NCR5380_write(MODE_REG, MR_BASE);
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+	/*
+	 * The only places we should see a phase mismatch and have to send
+	 * data from the same set of pointers will be the data transfer
+	 * phases.  So, residual, requested length are only important here.
+	 */
+
+	if (!(hostdata->connected->SCp.phase & SR_CD)) {
+		transferred = instance->dmalen - NCR5380_dma_residual();
+		hostdata->connected->SCp.this_residual -= transferred;
+		hostdata->connected->SCp.ptr += transferred;
+	}
+}
+#endif				/* def REAL_DMA */
+
+/*
+ * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
+ *
+ * Purpose : abort a command
+ *
+ * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 
+ *      host byte of the result field to, if zero DID_ABORTED is 
+ *      used.
+ *
+ * Returns : 0 - success, -1 on failure.
+ *
+ *	XXX - there is no way to abort the command that is currently 
+ *	connected, you have to wait for it to complete.  If this is 
+ *	a problem, we could implement longjmp() / setjmp(), setjmp()
+ *	called where the loop started in NCR5380_main().
+ *
+ * Locks: host lock taken by caller
+ */
+
+static int NCR5380_abort(Scsi_Cmnd * cmd) {
+	NCR5380_local_declare();
+	struct Scsi_Host *instance = cmd->device->host;
+	struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+	Scsi_Cmnd *tmp, **prev;
+	
+	printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
+	print_Scsi_Cmnd(cmd);
+
+	NCR5380_print_status(instance);
+
+	NCR5380_setup(instance);
+
+	dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
+	dprintk(NDEBUG_ABORT, ("        basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
+
+#if 0
+/*
+ * Case 1 : If the command is the currently executing command, 
+ * we'll set the aborted flag and return control so that 
+ * information transfer routine can exit cleanly.
+ */
+
+	if (hostdata->connected == cmd) {
+		dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
+		hostdata->aborted = 1;
+/*
+ * We should perform BSY checking, and make sure we haven't slipped
+ * into BUS FREE.
+ */
+
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
+/* 
+ * Since we can't change phases until we've completed the current 
+ * handshake, we have to source or sink a byte of data if the current
+ * phase is not MSGOUT.
+ */
+
+/* 
+ * Return control to the executing NCR drive so we can clear the
+ * aborted flag and get back into our main loop.
+ */
+
+		return 0;
+	}
+#endif
+
+/* 
+ * Case 2 : If the command hasn't been issued yet, we simply remove it 
+ *          from the issue queue.
+ */
+ 
+	dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
+	for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
+		if (cmd == tmp) {
+			REMOVE(5, *prev, tmp, tmp->host_scribble);
+			(*prev) = (Scsi_Cmnd *) tmp->host_scribble;
+			tmp->host_scribble = NULL;
+			tmp->result = DID_ABORT << 16;
+			dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
+			tmp->done(tmp);
+			return SUCCESS;
+		}
+#if (NDEBUG  & NDEBUG_ABORT)
+	/* KLL */
+		else if (prev == tmp)
+			printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
+#endif
+
+/* 
+ * Case 3 : If any commands are connected, we're going to fail the abort
+ *          and let the high level SCSI driver retry at a later time or 
+ *          issue a reset.
+ *
+ *          Timeouts, and therefore aborted commands, will be highly unlikely
+ *          and handling them cleanly in this situation would make the common
+ *          case of noresets less efficient, and would pollute our code.  So,
+ *          we fail.
+ */
+
+	if (hostdata->connected) {
+		dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
+		return FAILED;
+	}
+/*
+ * Case 4: If the command is currently disconnected from the bus, and 
+ *      there are no connected commands, we reconnect the I_T_L or 
+ *      I_T_L_Q nexus associated with it, go into message out, and send 
+ *      an abort message.
+ *
+ * This case is especially ugly. In order to reestablish the nexus, we
+ * need to call NCR5380_select().  The easiest way to implement this 
+ * function was to abort if the bus was busy, and let the interrupt
+ * handler triggered on the SEL for reselect take care of lost arbitrations
+ * where necessary, meaning interrupts need to be enabled.
+ *
+ * When interrupts are enabled, the queues may change - so we 
+ * can't remove it from the disconnected queue before selecting it
+ * because that could cause a failure in hashing the nexus if that 
+ * device reselected.
+ * 
+ * Since the queues may change, we can't use the pointers from when we
+ * first locate it.
+ *
+ * So, we must first locate the command, and if NCR5380_select()
+ * succeeds, then issue the abort, relocate the command and remove
+ * it from the disconnected queue.
+ */
+
+	for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
+		if (cmd == tmp) {
+			dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
+
+			if (NCR5380_select(instance, cmd, (int) cmd->tag))
+				return FAILED;
+			dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
+
+			do_abort(instance);
+
+			for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
+				if (cmd == tmp) {
+					REMOVE(5, *prev, tmp, tmp->host_scribble);
+					*prev = (Scsi_Cmnd *) tmp->host_scribble;
+					tmp->host_scribble = NULL;
+					tmp->result = DID_ABORT << 16;
+					tmp->done(tmp);
+					return SUCCESS;
+				}
+		}
+/*
+ * Case 5 : If we reached this point, the command was not found in any of 
+ *          the queues.
+ *
+ * We probably reached this point because of an unlikely race condition
+ * between the command completing successfully and the abortion code,
+ * so we won't panic, but we will notify the user in case something really
+ * broke.
+ */
+	printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
+			"         before abortion\n", instance->host_no);
+	return FAILED;
+}
+
+
+/* 
+ * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
+ * 
+ * Purpose : reset the SCSI bus.
+ *
+ * Returns : SUCCESS
+ *
+ * Locks: host lock taken by caller
+ */
+
+static int NCR5380_bus_reset(Scsi_Cmnd * cmd) {
+	NCR5380_local_declare();
+	NCR5380_setup(cmd->device->host);
+
+	NCR5380_print_status(cmd->device->host);
+	do_reset(cmd->device->host);
+	return SUCCESS;
+}
+
+/* 
+ * Function : int NCR5380_device_reset (Scsi_Cmnd *cmd)
+ * 
+ * Purpose : reset a SCSI device
+ *
+ * Returns : FAILED
+ *
+ * Locks: io_request_lock held by caller
+ */
+
+static int NCR5380_device_reset(Scsi_Cmnd * cmd) {
+	return FAILED;
+}
+
+/* 
+ * Function : int NCR5380_host_reset (Scsi_Cmnd *cmd)
+ * 
+ * Purpose : reset a SCSI device
+ *
+ * Returns : FAILED
+ *
+ * Locks: io_request_lock held by caller
+ */
+
+static int NCR5380_host_reset(Scsi_Cmnd * cmd) {
+	return FAILED;
+}