Linux-2.6.12-rc2v2.6.12-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 00000000000..5e71a0beafc
--- /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