1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.

1 files changed, 3247 insertions, 0 deletions

diff --git a/linux/src/drivers/scsi/NCR5380.c b/linux/src/drivers/scsi/NCR5380.c
new file mode 100644
index 0000000..e6fc75c
--- /dev/null
+++ b/linux/src/drivers/scsi/NCR5380.c
@@ -0,0 +1,3247 @@
+#ifndef NDEBUG
+#define NDEBUG (NDEBUG_RESTART_SELECT | NDEBUG_ABORT)
+#endif
+/* 
+ * 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 1.7  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.
+ * 
+ * 3.  Test USLEEP code 
+ *
+ * 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 USLEEP
+#undef REAL_DMA
+#endif
+
+#ifdef REAL_DMA_POLL
+#undef READ_OVERRUNS
+#define READ_OVERRUNS
+#endif
+
+/*
+ * Design
+ * Issues :
+ *
+ * The other Linux SCSI drivers were written when Linux was Intel PC-only,
+ * and specifically for each board rather than each chip.  This makes their
+ * adaptation to platforms like the Mac (Some of which use NCR5380's)
+ * more difficult than it has to be.
+ *
+ * Also, many of the SCSI drivers were written before the command queuing
+ * routines were implemented, meaning their implementations of queued 
+ * commands were hacked on rather than designed in from the start.
+ *
+ * When I designed the Linux SCSI drivers I figured that 
+ * while having two different SCSI boards in a system might be useful
+ * for debugging things, two of the same type wouldn't be used.
+ * Well, I was wrong and a number of users have mailed me about running
+ * multiple high-performance SCSI boards in a server.
+ *
+ * Finally, when I get questions from users, I have no idea what 
+ * revision of my driver they are running.
+ *
+ * This driver attempts to address these problems :
+ * 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.
+ *
+ * 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.
+ *
+ * To solve the multiple-boards-in-the-same-system problem, 
+ * there is a separate instance structure for each instance
+ * of a 5380 in the system.  So, multiple NCR5380 drivers will
+ * be able to coexist with appropriate changes to the high level
+ * SCSI code.  
+ *
+ * A NCR5380_PUBLIC_REVISION macro is provided, with the release
+ * number (updated for each public release) printed by the 
+ * NCR5380_print_options command, which should be called from the 
+ * wrapper detect function, so that I know what release of the driver
+ * users are using.
+ *
+ * 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 when not running by the interrupt handler,
+ * timer, and queue command function.  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 USLEEP
+ * was defined, and 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 a 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.
+ *
+ * SCSI2 - if defined, SCSI-2 tagged queuing is used where possible
+ *
+ * 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.
+ *
+ * USLEEP - if defined, on devices that aren't disconnecting from the 
+ *	bus, we will go to sleep so that the CPU can get real work done 
+ *	when we run a command that won't complete immediately.
+ *
+ * Note that if USLEEP is defined, NCR5380_TIMER *must* also be
+ * defined.
+ *
+ * Defaults for these will be provided if USLEEP is defined, 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);
+ *
+ * If nothing specific to this implementation needs doing (ie, with external
+ * hardware), you must also define 
+ *  
+ * NCR5380_queue_command
+ * NCR5380_reset
+ * NCR5380_abort
+ * NCR5380_proc_info
+ *
+ * to be the global entry points into the specific driver, ie 
+ * #define NCR5380_queue_command t128_queue_command.
+ *
+ * If this is not done, the routines will be defined as static functions
+ * with the NCR5380* names and the user must provide a globally
+ * accessible wrapper function.
+ *
+ * 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.  Before the specific driver initialization
+ * code finishes, NCR5380_print_options should be called.
+ */
+
+static int do_abort (struct Scsi_Host *host);
+static void do_reset (struct Scsi_Host *host);
+static struct Scsi_Host *first_instance = NULL;
+static Scsi_Host_Template *the_template = NULL;
+
+/*
+ * Function : void initialize_SCp(Scsi_Cmnd *cmd)
+ *
+ * Purpose : initialize the saved data pointers for cmd to point to the 
+ *	start of the buffer.
+ *
+ * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
+ */
+
+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 = (char *) cmd->SCp.buffer->address;
+	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;
+    }
+}
+
+#include <linux/delay.h>
+
+#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}};
+
+/*
+ * Function : void NCR5380_print(struct Scsi_Host *instance)
+ *
+ * Purpose : print the SCSI bus signals for debugging purposes
+ *
+ * Input : instance - which NCR5380
+ */
+
+static void NCR5380_print(struct Scsi_Host *instance) {
+    NCR5380_local_declare();
+    unsigned char status, data, basr, mr, icr, i;
+    NCR5380_setup(instance);
+    cli();
+    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);
+    sti();
+    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");
+}
+
+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"}};
+
+/* 
+ * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
+ *
+ * Purpose : print the current SCSI phase for debugging purposes
+ *
+ * Input : instance - which NCR5380
+ */
+
+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
+
+/*
+ * We need to have our coroutine active given these constraints : 
+ * 1.  The mutex flag, main_running, can only be set when the main 
+ *     routine can actually process data, otherwise SCSI commands
+ *     will never get issued.
+ *
+ * 2.  NCR5380_main() shouldn't be called before it has exited, because
+ *     other drivers have had kernel stack overflows in similar
+ *     situations.
+ *
+ * 3.  We don't want to inline NCR5380_main() because of space concerns,
+ *     even though it is only called in two places.
+ *
+ * So, the solution is to set the mutex in an inline wrapper for the 
+ * main coroutine, and have the main coroutine exit with interrupts 
+ * disabled after the final search through the queues so that no race 
+ * conditions are possible.
+ */
+
+static volatile int main_running = 0;
+
+/* 
+ * Function : run_main(void)
+ * 
+ * Purpose : insure that the coroutine is running and will process our 
+ * 	request.  main_running is checked/set here (in an inline function)
+ *	rather than in NCR5380_main itself to reduce the chances of stack
+ *	overflow.
+ *
+ */
+
+static __inline__ void run_main(void) {
+    cli();
+    if (!main_running) {
+	main_running = 1;
+	NCR5380_main();
+	/* 
+	 * main_running is cleared in NCR5380_main once it can't do 
+	 * more work, and NCR5380_main exits with interrupts disabled.
+	 */
+	sti();
+    } else 
+	sti();
+}
+
+#ifdef USLEEP
+#ifndef NCR5380_TIMER
+#error "NCR5380_TIMER must be defined so that this type of NCR5380 driver gets a unique timer."
+#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
+
+static struct Scsi_Host * expires_first = NULL;
+
+/* 
+ * 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;
+    }
+}
+
+/*
+ * Assumes instance->time_expires has been set in higher level code.
+ */
+
+static int NCR5380_set_timer (struct Scsi_Host *instance) {
+    struct Scsi_Host *tmp, **prev;
+    
+    cli();
+    if (((struct NCR5380_hostdata *) (instance->host_data))->next_timer) {
+	sti();
+	return -1;
+    }
+
+    for (prev = &expires_first, tmp = expires_first; tmp; 
+	prev = &(((struct NCR5380_hostdata *) tmp->host_data)->next_timer), 
+	tmp = ((struct NCR5380_hostdata *) tmp->host_data)->next_timer)
+	if (instance->time_expires < tmp->time_expires) 
+	    break;
+	   
+    instance->next_timer = tmp;
+    *prev = instance;
+    timer_table[NCR5380_TIMER].expires = expires_first->time_expires;
+    timer_active |= 1 << NCR5380_TIMER;
+    sti();
+    return 0;
+}    
+
+/* Doing something about unwanted reentrancy here might be useful */
+void NCR5380_timer_fn(void) {
+    struct Scsi_Host *instance;
+    cli();
+    for (; expires_first && expires_first->time_expires >= jiffies; ) {
+	instance = ((NCR5380_hostdata *) expires_first->host_data)->
+	    expires_next;
+	((NCR5380_hostdata *) expires_first->host_data)->expires_next = 
+	    NULL;
+	((NCR5380_hostdata *) expires_first->host_data)->time_expires = 
+	    0;
+	expires_first = instance;
+    }
+
+    if (expires_first) {
+	timer_table[NCR5380_TIMER].expires = ((NCR5380_hostdata *) 
+	    expires_first->host_data)->time_expires;
+	timer_active |= (1 << NCR5380_TIMER);
+    } else {
+	timer_table[NCR5380_TIMER].expires = 0;
+	timer_active &= ~(1 << MCR5380_TIMER);
+    }
+    sti();
+
+    run_main();
+}
+#endif /* def USLEEP */
+
+static void NCR5380_all_init (void) {
+    static int done = 0;
+    if (!done) {
+#if (NDEBUG & NDEBUG_INIT)
+	printk("scsi : NCR5380_all_init()\n");
+#endif
+	done = 1;
+#ifdef USLEEP
+	timer_table[NCR5380_TIMER].expires = 0;
+	timer_table[NCR5380_TIMER].fn = NCR5380_timer_fn;
+#endif
+    }
+}
+
+#ifdef AUTOPROBE_IRQ
+/*
+ * Function : int NCR5380_probe_irq (struct Scsi_Host *instance, int possible)
+ * 
+ * Purpose : autoprobe for the IRQ line used by the NCR5380.  
+ *
+ * Inputs : instance - pointer to this instance of the NCR5380 driver,
+ *          possible - bitmask of permissible interrupts.
+ *
+ * Returns : number of the IRQ selected, IRQ_NONE if no interrupt fired.
+ * 
+ * XXX no effort is made to deal with spurious interrupts. 
+ */
+
+
+static int probe_irq;
+static void probe_intr (int irq, void *dev_id, struct pt_regs * regs) {
+    probe_irq = irq;
+};
+
+static int 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 = 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 == IRQ_NONE && jiffies < timeout)
+    	barrier();
+
+    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;
+}
+#endif /* AUTOPROBE_IRQ */
+ 
+/*
+ * Function : void NCR58380_print_options (struct Scsi_Host *instance)
+ *
+ * Purpose : called by probe code indicating the NCR5380 driver
+ *	     options that were selected.
+ *
+ * Inputs : instance, pointer to this instance.  Unused.
+ */
+
+static void 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 SCSI2
+    " SCSI-2"
+#endif
+#ifdef UNSAFE
+    " UNSAFE "
+#endif
+    );
+#ifdef USLEEP
+    printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
+#endif
+    printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
+    if (((struct NCR5380_hostdata *)instance->hostdata)->flags & FLAG_NCR53C400) {
+	printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
+    }
+}
+
+/*
+ * Function : void NCR5380_print_status (struct Scsi_Host *instance)
+ *
+ * Purpose : print commands in the various queues, called from
+ *	NCR5380_abort and NCR5380_debug to aid debugging.
+ *
+ * Inputs : instance, pointer to this instance.  
+ */
+
+static void NCR5380_print_status (struct Scsi_Host *instance) {
+   static char pr_bfr[512];
+   char *start;
+   int len;
+
+    printk("NCR5380 : coroutine is%s running.\n",
+	main_running ? "" : "n't");
+    
+#ifdef NDEBUG
+    NCR5380_print (instance);
+    NCR5380_print_phase (instance);
+#endif
+
+   len = NCR5380_proc_info(pr_bfr, &start, 0, sizeof(pr_bfr),
+			instance->host_no, 0);
+   pr_bfr[len] = 0;
+   printk("\n%s\n", pr_bfr);
+  }
+
+/******************************************/
+/*
+ * /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);
+
+#ifndef NCR5380_proc_info
+static
+#endif
+int NCR5380_proc_info (
+     char *buffer, char **start,off_t offset,
+     int length,int hostno,int inout)
+{
+   char *pos = buffer;
+   struct Scsi_Host *instance;
+   struct NCR5380_hostdata *hostdata;
+   Scsi_Cmnd *ptr;
+
+   for (instance = first_instance; instance &&
+        instance->host_no != hostno; instance=instance->next)
+        ;
+   if (!instance)
+      return(-ESRCH);
+   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 == 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
+    cli();
+    SPRINTF("NCR5380 : coroutine is%s running.\n", main_running ? "" : "n't");
+    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);
+
+   sti();
+   *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->host->host_no, cmd->target, cmd->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);
+}
+
+
+/* 
+ * Function : void NCR5380_init (struct Scsi_Host *instance, flags)
+ *
+ * Purpose : initializes *instance and corresponding 5380 chip,
+ *	with flags OR'd into the initial flags value.
+ *
+ * Inputs : instance - instantiation of the 5380 driver.  
+ *
+ * Notes : I assume that the host, hostno, and id bits have been
+ * 	set correctly.  I don't care about the irq and other fields. 
+ * 
+ */
+
+static void 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;
+
+    /* 
+     * 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);
+
+    NCR5380_all_init();
+
+    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;
+#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;
+
+    if (!the_template) {
+	the_template = instance->hostt;
+	first_instance = instance;
+    }
+	
+
+#ifdef USLEEP
+    hostdata->time_expires = 0;
+    hostdata->next_timer = NULL;
+#endif
+
+#ifndef AUTOSENSE
+    if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)) 
+	 printk("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("scsi%d: SCSI bus busy, waiting up to five seconds\n",
+		instance->host_no);
+	    timeout = jiffies + 5*HZ;
+	    while (jiffies < timeout && (NCR5380_read(STATUS_REG) & SR_BSY));
+	    break;
+	case 2:
+	    printk("scsi%d: bus busy, attempting abort\n",
+		instance->host_no);
+	    do_abort (instance);
+	    break;
+	case 4:
+	    printk("scsi%d: bus busy, attempting reset\n",
+		instance->host_no);
+	    do_reset (instance);
+	    break;
+	case 6:
+	    printk("scsi%d: bus locked solid or invalid override\n",
+		instance->host_no);
+	}
+    }
+}
+
+/* 
+ * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, 
+ *	void (*done)(Scsi_Cmnd *)) 
+ *
+ * Purpose :  enqueues a SCSI command
+ *
+ * Inputs : cmd - SCSI command, done - function called on completion, with
+ *	a pointer to the command descriptor.
+ * 
+ * Returns : 0
+ *
+ * Side effects : 
+ *      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.
+ *
+ */
+
+/* Only make static if a wrapper function is used */
+#ifndef NCR5380_queue_command
+static
+#endif
+int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) {
+    struct Scsi_Host *instance = cmd->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
+# if 0
+    if (!hostdata->connected && !hostdata->issue_queue &&
+	!hostdata->disconnected_queue) {
+	hostdata->timebase = jiffies;
+    }
+# endif
+# ifdef NCR5380_STAT_LIMIT
+    if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+# endif
+	switch (cmd->cmnd[0])
+	{
+	    case WRITE:
+	    case WRITE_6:
+	    case WRITE_10:
+		hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
+		hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
+		hostdata->pendingw++;
+		break;
+	    case READ:
+	    case READ_6:
+	    case READ_10:
+		hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
+		hostdata->bytes_read[cmd->target] += 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.
+     */
+
+    cli();
+    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;
+    }
+#if (NDEBUG & NDEBUG_QUEUES)
+    printk("scsi%d : command added to %s of queue\n", instance->host_no,
+	(cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
+#endif
+
+/* Run the coroutine if it isn't already running. */
+    run_main();
+    return 0;
+}
+
+/*
+ * Function : NCR5380_main (void) 
+ *
+ * Purpose : 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.
+ * 
+ * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should 
+ *  reenable them.  This prevents reentrancy and kernel stack overflow.
+ */ 	
+    
+static void NCR5380_main (void) {
+    Scsi_Cmnd *tmp, *prev;
+    struct Scsi_Host *instance;
+    struct NCR5380_hostdata *hostdata;
+    int done;
+
+    /*
+     * We run (with interrupts disabled) until we're sure that none of 
+     * the host adapters have anything that can be done, at which point 
+     * we set main_running to 0 and exit.
+     *
+     * Interrupts are enabled before doing various other internal 
+     * instructions, after we've decided that we need to run through
+     * the loop again.
+     *
+     * this should prevent any race conditions.
+     */
+
+    do {
+	cli(); /* Freeze request queues */
+	done = 1;
+	for (instance = first_instance; instance && 
+	    instance->hostt == the_template; instance=instance->next) {
+	    hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+	    cli();
+	    if (!hostdata->connected) {
+#if (NDEBUG & NDEBUG_MAIN)
+		printk("scsi%d : not connected\n", instance->host_no);
+#endif
+		/*
+		 * Search through the issue_queue for a command destined
+		 * for a target that's not busy.
+		 */
+#if (NDEBUG & NDEBUG_LISTS)
+		for (tmp= (Scsi_Cmnd *) hostdata->issue_queue, prev=NULL; tmp && (tmp != prev); prev=tmp, tmp=(Scsi_Cmnd*)tmp->host_scribble)
+		    ;
+		    /*printk("%p  ", tmp);*/
+		if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
+#endif
+		for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, 
+		    prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) 
+		    tmp->host_scribble) {
+
+#if (NDEBUG & NDEBUG_LISTS)
+		    if (prev != tmp)
+			printk("MAIN tmp=%p   target=%d   busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun);
+#endif
+		    /*  When we find one, remove it from the issue queue. */
+		    if (!(hostdata->busy[tmp->target] & (1 << tmp->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;
+
+			/* reenable interrupts after finding one */
+			sti();
+
+			/* 
+			 * 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.	
+			 */
+#if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
+			printk("scsi%d : main() : command for target %d lun %d removed from issue_queue\n",
+			    instance->host_no, tmp->target, tmp->lun);
+#endif
+    		
+			/*
+			 * 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.
+			 */
+
+			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 {
+			    cli();
+			    LIST(tmp, hostdata->issue_queue);
+			    tmp->host_scribble = (unsigned char *) 
+				hostdata->issue_queue;
+			    hostdata->issue_queue = tmp;
+			    done = 0;
+			    sti();
+#if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
+			printk("scsi%d : main(): select() failed, returned to issue_queue\n",
+			    instance->host_no);
+#endif
+			}
+		    } /* if target/lun is not busy */
+		} /* for */
+	    } /* if (!hostdata->connected) */
+		
+	    if (hostdata->connected 
+#ifdef REAL_DMA
+		&& !hostdata->dmalen
+#endif
+#ifdef USLEEP
+		&& (!hostdata->time_expires || hostdata->time_expires >= jiffies)
+#endif
+		) {
+		sti();
+#if (NDEBUG & NDEBUG_MAIN)
+		printk("scsi%d : main() : performing information transfer\n",
+			instance->host_no);
+#endif
+		NCR5380_information_transfer(instance);
+#if (NDEBUG & NDEBUG_MAIN)
+		printk("scsi%d : main() : done set false\n", instance->host_no);
+#endif
+		done = 0;
+	    } else 
+		break;
+	} /* for instance */
+    } while (!done);
+    main_running = 0;
+}
+
+#ifndef DONT_USE_INTR
+/*
+ * Function : void NCR5380_intr (int irq)
+ * 
+ * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
+ *	from the disconnected queue, and restarting NCR5380_main() 
+ *	as required.
+ *
+ * Inputs : int irq, irq that caused this interrupt.
+ *
+ */
+
+static void NCR5380_intr (int irq, void *dev_id, struct pt_regs * regs) {
+    NCR5380_local_declare(); 
+    struct Scsi_Host *instance;
+    int done;
+    unsigned char basr;
+#if (NDEBUG & NDEBUG_INTR)
+    printk("scsi : NCR5380 irq %d triggered\n", irq);
+#endif
+    do {
+	done = 1;
+	for (instance = first_instance; instance && (instance->hostt == 
+	    the_template); instance = instance->next)
+	    if (instance->irq == irq) {
+		
+		/* 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) {
+#if (NDEBUG & NDEBUG_INTR)
+		    NCR5380_print(instance);
+#endif
+		    if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == 
+			(SR_SEL | SR_IO)) {
+			done = 0;
+			sti();
+#if (NDEBUG & NDEBUG_INTR)
+			printk("scsi%d : SEL interrupt\n", instance->host_no);
+#endif
+			NCR5380_reselect(instance);
+			(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+		    } else if (basr & BASR_PARITY_ERROR) {
+#if (NDEBUG & NDEBUG_INTR)
+			printk("scsi%d : PARITY interrupt\n", instance->host_no);
+#endif
+			(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ 		    } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
+#if (NDEBUG & NDEBUG_INTR)
+ 			printk("scsi%d : RESET interrupt\n", instance->host_no);
+#endif
+			(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+		    } else {
+/*  
+ * XXX the rest of the interrupt conditions should *only* occur during a 
+ * DMA transfer, which I haven't gotten around to fixing yet.
+ */
+
+#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);
+#if NCR_TIMEOUT
+			    {
+			      unsigned long timeout = jiffies + NCR_TIMEOUT;
+
+			      while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK
+				     && jiffies < timeout)
+				;
+			      if (jiffies >= timeout)
+			        printk("scsi%d: timeout at NCR5380.c:%d\n", 
+				    host->host_no, __LINE__);
+			    }
+#else /* NCR_TIMEOUT */
+			    while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
+#endif
+
+			    NCR5380_write(MODE_REG, MR_BASE);
+			    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+			}
+#else
+#if (NDEBUG & NDEBUG_INTR)
+		    printk("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
+#endif
+		    (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+#endif
+		    } 
+		} /* if BASR_IRQ */
+		if (!done) 
+		    run_main();
+	    } /* if (instance->irq == irq) */
+    } while (!done);
+}
+#endif
+
+#ifdef NCR5380_STATS
+static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
+{
+# ifdef NCR5380_STAT_LIMIT
+    if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+# endif
+	switch (cmd->cmnd[0])
+	{
+	    case WRITE:
+	    case WRITE_6:
+	    case WRITE_10:
+		hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
+		/*hostdata->bytes_write[cmd->target] += cmd->request_bufflen;*/
+		hostdata->pendingw--;
+		break;
+	    case READ:
+	    case READ_6:
+	    case READ_10:
+		hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
+		/*hostdata->bytes_read[cmd->target] += cmd->request_bufflen;*/
+		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.
+ */
+
+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;
+    NCR5380_setup(instance);
+
+    hostdata->restart_select = 0;
+#if defined (NDEBUG) && (NDEBUG & NDEBUG_ARBITRATION) 
+    NCR5380_print(instance);
+    printk("scsi%d : starting arbitration, id = %d\n", instance->host_no,
+	instance->this_id);
+#endif
+    cli(); 
+
+    /* 
+     * 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);
+
+    sti();
+
+    /* Wait for arbitration logic to complete */
+#if NCR_TIMEOUT
+    {
+      unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
+
+      while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
+	   && jiffies < timeout)
+	;
+      if (jiffies >= timeout)
+      {
+	printk("scsi: arbitration timeout at %d\n", __LINE__);
+	NCR5380_write(MODE_REG, MR_BASE);
+	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+	return -1;
+      }
+    }
+#else /* NCR_TIMEOUT */
+    while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS));
+#endif
+
+#if (NDEBUG & NDEBUG_ARBITRATION) 
+    printk("scsi%d : arbitration complete\n", instance->host_no);
+/* Avoid GCC 2.4.5 asm needs to many reloads error */
+    __asm__("nop");
+#endif
+
+    /* 
+     * 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); 
+#if (NDEBUG & NDEBUG_ARBITRATION)
+    printk("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", 
+	instance->host_no);
+#endif
+	return -1;
+    }
+
+
+
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
+    
+    if (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) {
+	NCR5380_write(MODE_REG, MR_BASE);
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+#if (NDEBUG & NDEBUG_ARBITRATION)
+    printk("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", 
+	instance->host_no);
+#endif
+	return -1;
+    }
+
+    /* 
+     * Again, bus clear + bus settle time is 1.2us, however, this is 
+     * a minimum so we'll udelay ceil(1.2)
+     */
+
+    udelay(2);	
+
+#if (NDEBUG & NDEBUG_ARBITRATION)
+    printk("scsi%d : won arbitration\n", instance->host_no);
+#endif
+
+
+    /* 
+     * 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->target)));
+
+    /* 
+     * 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);
+
+#if (NDEBUG & NDEBUG_SELECTION)
+    printk("scsi%d : selecting target %d\n", instance->host_no, cmd->target);
+#endif
+
+    /* 
+     * 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.
+     */
+
+    while ((jiffies < timeout) && !(NCR5380_read(STATUS_REG) & 
+	(SR_BSY | SR_IO)));
+
+    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->target)) {
+	    printk("scsi%d : weirdness\n", instance->host_no);
+	    if (hostdata->restart_select)
+		printk("\trestart select\n");
+#ifdef NDEBUG
+	    NCR5380_print (instance);
+#endif
+	    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+	    return -1;
+	}
+	cmd->result = DID_BAD_TARGET << 16;
+#ifdef NCR5380_STATS
+	collect_stats(hostdata, cmd);
+#endif
+	cmd->scsi_done(cmd);
+	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+#if (NDEBUG & NDEBUG_SELECTION)
+	printk("scsi%d : target did not respond within 250ms\n", 
+	    instance->host_no);
+#endif
+	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+	return 0;
+    } 
+
+    hostdata->targets_present |= (1 << cmd->target);
+
+    /*
+     * 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 */
+#ifdef NCR_TIMEOUT
+    {
+      unsigned long timeout = jiffies + NCR_TIMEOUT;
+ 
+      while (!(NCR5380_read(STATUS_REG) & SR_REQ) && jiffies < timeout);
+
+      if (jiffies >= timeout) {
+        printk("scsi%d: timeout at NCR5380.c:%d\n", __LINE__);
+        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+        return -1;
+      }
+    }
+#else /* NCR_TIMEOUT */
+    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
+#endif /* def NCR_TIMEOUT */
+
+#if (NDEBUG & NDEBUG_SELECTION)
+    printk("scsi%d : target %d selected, going into MESSAGE OUT phase.\n",
+	instance->host_no, cmd->target);
+#endif
+    tmp[0] = IDENTIFY(((instance->irq == IRQ_NONE) ? 0 : 1), cmd->lun);
+#ifdef SCSI2
+    if (cmd->device->tagged_queue && (tag != TAG_NONE)) {
+	tmp[1] = SIMPLE_QUEUE_TAG;
+	if (tag == TAG_NEXT) {
+	    /* 0 is TAG_NONE, used to imply no tag for this command */
+	    if (cmd->device->current_tag == 0)
+		cmd->device->current_tag = 1;
+
+	    cmd->tag = cmd->device->current_tag;
+	    cmd->device->current_tag++;
+	} else  
+	    cmd->tag = (unsigned char) tag;
+
+	tmp[2] = cmd->tag;
+	hostdata->last_message = SIMPLE_QUEUE_TAG;
+	len = 3;
+    } else 
+#endif /* def SCSI2 */
+    {
+	len = 1;
+	cmd->tag=0;
+    }
+
+    /* Send message(s) */
+    data = tmp;
+    phase = PHASE_MSGOUT;
+    NCR5380_transfer_pio(instance, &phase, &len, &data);
+#if (NDEBUG & NDEBUG_SELECTION)
+    printk("scsi%d : nexus established.\n", instance->host_no);
+#endif
+    /* XXX need to handle errors here */
+    hostdata->connected = cmd;
+#ifdef SCSI2
+    if (!cmd->device->tagged_queue)
+#endif    
+	hostdata->busy[cmd->target] |= (1 << cmd->lun);
+
+    initialize_SCp(cmd);
+
+
+    return 0;
+}
+
+/* 
+ * 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();
+    register unsigned char p = *phase, tmp;
+    register int c = *count;
+    register unsigned char *d = *data;
+    NCR5380_setup(instance);
+
+#if (NDEBUG & NDEBUG_PIO)
+    if (!(p & SR_IO))
+      printk("scsi%d : pio write %d bytes\n", instance->host_no, c);
+    else
+      printk("scsi%d : pio read %d bytes\n", instance->host_no, c);
+#endif
+
+    /* 
+     * 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));
+
+    do {
+	/* 
+	 * Wait for assertion of REQ, after which the phase bits will be 
+	 * valid 
+	 */
+	while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
+
+#if (NDEBUG & NDEBUG_HANDSHAKE)
+	printk("scsi%d : REQ detected\n", instance->host_no);
+#endif
+
+	/* Check for phase mismatch */	
+	if ((tmp & PHASE_MASK) != p) {
+#if (NDEBUG & NDEBUG_PIO)
+	    printk("scsi%d : phase mismatch\n", instance->host_no);
+	    NCR5380_print_phase(instance);
+#endif
+	    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);
+#if (NDEBUG & NDEBUG_PIO)
+	NCR5380_print(instance);
+#endif
+		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);
+#if (NDEBUG & NDEBUG_PIO)
+	NCR5380_print(instance);
+#endif
+		NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
+		    ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+	    }
+	} else {
+#if (NDEBUG & NDEBUG_PIO)
+	NCR5380_print(instance);
+#endif
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
+	}
+
+	while (NCR5380_read(STATUS_REG) & SR_REQ);
+
+#if (NDEBUG & NDEBUG_HANDSHAKE)
+	    printk("scsi%d : req false, handshake complete\n", instance->host_no);
+#endif
+
+/*
+ * 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);
+
+#if (NDEBUG & NDEBUG_PIO) 
+    printk("scsi%d : residual %d\n", instance->host_no, c);
+#endif
+
+    *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;
+}
+
+static void do_reset (struct Scsi_Host *host) {
+    NCR5380_local_declare();
+    NCR5380_setup(host);
+
+    cli();
+    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);
+    sti();
+}
+
+/*
+ * 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.
+ */
+
+static int do_abort (struct Scsi_Host *host) {
+    NCR5380_local_declare();
+    unsigned char tmp, *msgptr, phase;
+    int len;
+    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.
+     */
+    
+    while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
+
+    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);
+	while (NCR5380_read(STATUS_REG) & SR_REQ);
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+    }
+   
+    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.
+ *
+ */
+
+
+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
+#if (NDEBUG & NDEBUG_DMA)
+    printk("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);
+#endif
+    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)
+    cli();
+#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 */
+
+#if (NDEBUG & NDEBUG_DMA) & 0
+    printk("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
+#endif
+
+/* 
+ * FOO stuff. For some UNAPPARENT reason, I'm getting 
+ * watchdog timers fired on bootup for NO APPARENT REASON, meaning it's
+ * probably a timing problem.
+ *
+ * Since this is the only place I have back-to-back writes, perhaps this 
+ * is the problem?
+ */
+
+    if (p & SR_IO) {
+#ifndef FOO
+	udelay(1);
+#endif
+	NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
+    } else {
+#ifndef FOO
+	udelay(1);
+#endif
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
+#ifndef FOO
+	udelay(1);
+#endif
+	NCR5380_write(START_DMA_SEND_REG, 0);
+#ifndef FOO
+	udelay(1);
+#endif
+    }
+
+#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;
+      }
+    }
+
+
+#if (NDEBUG & NDEBUG_DMA)
+    printk("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n",
+	   instance->host_no, tmp, NCR5380_read(STATUS_REG));
+#endif
+
+    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) {
+#if (NDEBUG & NDEBUG_DMA)
+	printk("Got an input overrun, using saved byte\n");
+#endif
+	**data = saved_data;
+	*data += 1;
+	*count -= 1;
+	cnt = toPIO = 1;
+      } else {
+	printk("No overrun??\n");
+	cnt = toPIO = 2;
+      }
+#if (NDEBUG & NDEBUG_DMA)
+      printk("Doing %d-byte PIO to 0x%X\n", cnt, *data);
+#endif
+      NCR5380_transfer_pio(instance, phase, &cnt, data);
+      *count -= toPIO - cnt;
+    }
+#endif        
+
+#if (NDEBUG & NDEBUG_DMA)
+     printk("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n",
+	    *data, *count, *(*data+*count-1), *(*data+*count));
+#endif
+     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;
+#if (NDEBUG & NDEBUG_C400_PWRITE)
+	printk("About to pwrite %d bytes\n", c);
+#endif
+	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;
+#if 1
+#if 1
+		while (!(NCR5380_read(BUS_AND_STATUS_REG) & 
+			BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) &
+			BASR_PHASE_MATCH));
+#else
+		if (NCR5380_read(STATUS_REG) & SR_REQ) {
+		    for (; timeout && 
+			!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK); 
+			--timeout);
+		    for (; timeout && (NCR5380_read(STATUS_REG) & SR_REQ);
+			--timeout);
+		} 
+#endif
+	
+
+#if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
+		if (!timeout) 
+		    printk("scsi%d : timed out on last byte\n",
+			    instance->host_no);
+#endif
+
+
+		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;
+#if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
+			printk("scsi%d : last bit sent works\n", 
+			    instance->host_no);
+#endif
+		    }
+		}
+	    } else  {
+#if (NDEBUG & NDEBUG_C400_PWRITE)
+		printk("Waiting for LASTBYTE\n");
+#endif
+		while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
+#if (NDEBUG & NDEBUG_C400_PWRITE)
+		printk("Got LASTBYTE\n");
+#endif
+	    }
+#else
+	    udelay (5);
+#endif
+	}
+#endif
+    }
+
+    NCR5380_write(MODE_REG, MR_BASE);
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+    if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
+#if (NDEBUG & NDEBUG_C400_PWRITE)
+	printk("53C400w: Checking for IRQ\n");
+#endif
+	if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
+#if (NDEBUG & NDEBUG_C400_PWRITE)
+	    printk("53C400w:    got it, reading reset interrupt reg\n");
+#endif
+	    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 0
+    NCR5380_print_phase(instance);
+#endif
+#if defined(PSEUDO_DMA) && !defined(UNSAFE)
+    sti();
+#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.
+ */
+ 
+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;
+    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;
+#if (NDEBUG & NDEBUG_INFORMATION)
+		NCR5380_print_phase(instance);
+#endif
+	    }
+	    
+	    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 = cmd->SCp.buffer->address;
+#if (NDEBUG & NDEBUG_INFORMATION)
+		    printk("scsi%d : %d bytes and %d buffers left\n",
+			instance->host_no, cmd->SCp.this_residual,
+			cmd->SCp.buffers_residual);
+#endif
+		}
+
+		/*
+		 * 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->target, cmd->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);
+		    
+#if (NDEBUG & NDEBUG_LINKED) 
+		    printk("scsi%d : target %d lun %d linked command complete.\n",
+			instance->host_no, cmd->target, cmd->lun);
+#endif
+		    /* 
+		     * 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->target, cmd->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); 
+#if (NDEBUG & NDEBUG_LINKED) 
+		    printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
+			instance->host_no, cmd->target, cmd->lun);
+#endif
+#ifdef NCR5380_STATS
+		    collect_stats(hostdata, cmd);
+#endif
+		    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;
+#if (NDEBUG & NDEBUG_QUEUES)
+		    printk("scsi%d : command for target %d, lun %d completed\n",
+			instance->host_no, cmd->target, cmd->lun);
+#endif
+		    hostdata->busy[cmd->target] &= ~(1 << cmd->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 (cmd->SCp.Status != GOOD)
+			cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
+		    
+#ifdef AUTOSENSE
+		    if ((cmd->cmnd[0] != REQUEST_SENSE) && 
+			(cmd->SCp.Status == CHECK_CONDITION)) {
+#if (NDEBUG & NDEBUG_AUTOSENSE) 
+			printk("scsi%d : performing request sense\n", 
+			    instance->host_no);
+#endif
+			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);
+
+			cli();
+			LIST(cmd,hostdata->issue_queue);
+			cmd->host_scribble = (unsigned char *) 
+			    hostdata->issue_queue;
+			hostdata->issue_queue = (Scsi_Cmnd *) cmd;
+			sti();
+#if (NDEBUG & NDEBUG_QUEUES)
+			printk("scsi%d : REQUEST SENSE added to head of issue queue\n",instance->host_no);
+#endif
+		   } else {
+#endif /* def AUTOSENSE */
+#ifdef NCR5380_STATS
+			collect_stats(hostdata, cmd);
+#endif
+			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->tagged_queue = 0;
+			hostdata->busy[cmd->target] |= (1 << cmd->lun);
+			break;
+		    default:
+			break;
+		    }
+		case DISCONNECT:
+		    /* Accept message by clearing ACK */
+		    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+		    cmd->device->disconnect = 1;
+		    cli();
+		    LIST(cmd,hostdata->disconnected_queue);
+		    cmd->host_scribble = (unsigned char *) 
+			hostdata->disconnected_queue;
+		    hostdata->connected = NULL;
+		    hostdata->disconnected_queue = cmd;
+		    sti();
+#if (NDEBUG & NDEBUG_QUEUES)
+		    printk("scsi%d : command for target %d lun %d was moved from connected to"
+			   "  the disconnected_queue\n", instance->host_no, 
+			    cmd->target, cmd->lun);
+#endif
+		    /* 
+		     * 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 */
+		    while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+		    	barrier();
+#if 0
+		    NCR5380_print_status(instance);
+#endif
+		    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);
+
+#if (NDEBUG & NDEBUG_EXTENDED)
+		    printk("scsi%d : receiving extended message\n",
+			instance->host_no);
+#endif
+
+		    len = 2;
+		    data = extended_msg + 1;
+		    phase = PHASE_MSGIN;
+		    NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+#if (NDEBUG & NDEBUG_EXTENDED)
+		    printk("scsi%d : length=%d, code=0x%02x\n", 
+			instance->host_no, (int) extended_msg[1],
+			(int) extended_msg[2]);
+#endif
+
+		    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);
+
+#if (NDEBUG & NDEBUG_EXTENDED)
+		    printk("scsi%d : message received, residual %d\n",
+			instance->host_no, len);
+#endif
+
+			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->target, cmd->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->target, cmd->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->target] &= ~(1 << cmd->lun);
+		    hostdata->connected = NULL;
+		    cmd->result = DID_ERROR << 16;
+#ifdef NCR5380_STATS
+		    collect_stats(hostdata, cmd);
+#endif
+		    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);
+#ifdef USLEEP
+		if (!disconnect && should_disconnect(cmd->cmnd[0])) {
+		    hostdata->time_expires = jiffies + USLEEP_SLEEP;
+#if (NDEBUG & NDEBUG_USLEEP)
+		printk("scsi%d : issued command, sleeping until %ul\n", instance->host_no,
+		    hostdata->time_expires);
+#endif
+		    NCR5380_set_timer (instance);
+		    return;
+		}
+#endif /* def USLEEP */
+		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);
+#ifdef NDEBUG
+		NCR5380_print(instance);
+#endif
+	    } /* switch(phase) */
+	} /* if (tmp * SR_REQ) */ 
+#ifdef USLEEP
+	else {
+	    if (!disconnect && hostdata->time_expires && jiffies > 
+		hostdata->time_expires) {
+		hostdata->time_expires = jiffies + USLEEP_SLEEP;
+#if (NDEBUG & NDEBUG_USLEEP)
+		printk("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no,
+		    hostdata->time_expires);
+#endif
+		NCR5380_set_timer (instance);
+		return;
+	    }
+	}
+#endif
+    } /* 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.
+ *
+ */
+
+
+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;
+#ifdef SCSI2
+    unsigned char tag;
+#endif
+    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);
+
+#if (NDEBUG & NDEBUG_RESELECTION)
+    printk("scsi%d : reselect\n", instance->host_no);
+#endif
+
+    /* 
+     * 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);
+    
+    while (NCR5380_read(STATUS_REG) & SR_SEL);
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+    /*
+     * Wait for target to go into MSGIN.
+     */
+
+    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
+
+    len = 1;
+    data = msg;
+    phase = PHASE_MSGIN;
+    NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+
+    if (!msg[0] & 0x80) {
+	printk("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.
+ 	 */
+
+#ifdef SCSI2
+#error "SCSI-II tagged queueing is not supported yet"
+#endif
+
+	/* 
+	 * 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->target)) && (lun == tmp->lun)
+#ifdef SCSI2
+	    && (tag == tmp->tag) 
+#endif
+) {
+	    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) {
+#ifdef SCSI2
+	    printk("scsi%d : warning : target bitmask %02x lun %d tag %d not in disconnect_queue.\n",
+		    instance->host_no, target_mask, lun, tag);
+#else
+	    printk("scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n",
+		    instance->host_no, target_mask, lun);
+#endif
+	/* 
+	 * 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;
+#if (NDEBUG & NDEBUG_RESELECTION)
+	printk("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n",
+	    instance->host_no, tmp->target, tmp->lun, tmp->tag);
+#endif
+    }
+}
+
+/*
+ * 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)
+     */
+
+    while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
+
+    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().
+ */
+
+#ifndef NCR5380_abort
+static
+#endif
+int NCR5380_abort (Scsi_Cmnd *cmd) {
+    NCR5380_local_declare();
+    struct Scsi_Host *instance = cmd->host;
+    struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+	instance->hostdata;
+    Scsi_Cmnd *tmp, **prev;
+
+    printk("scsi%d : aborting command\n", instance->host_no);
+    print_Scsi_Cmnd (cmd);
+
+    NCR5380_print_status (instance);
+
+    printk("scsi%d : aborting command\n", instance->host_no);
+    print_Scsi_Cmnd (cmd);
+
+    NCR5380_print_status (instance);
+
+    cli();
+    NCR5380_setup(instance);
+
+#if (NDEBUG & NDEBUG_ABORT)
+    printk("scsi%d : abort called\n", instance->host_no);
+    printk("        basr 0x%X, sr 0x%X\n", 
+	   NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG));
+#endif
+
+#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) {
+#if (NDEBUG & NDEBUG_ABORT)
+	printk("scsi%d : aborting connected command\n", instance->host_no);
+#endif
+	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.
+ */
+#if (NDEBUG & NDEBUG_ABORT)
+    /* KLL */
+    printk("scsi%d : abort going into loop.\n", instance->host_no);
+#endif
+    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;
+	    sti();
+#if (NDEBUG & NDEBUG_ABORT)
+    printk("scsi%d : abort removed command from issue queue.\n", 
+	instance->host_no);
+#endif
+	    tmp->done(tmp);
+	    return SCSI_ABORT_SUCCESS;
+	}
+#if (NDEBUG  & NDEBUG_ABORT)
+    /* KLL */
+    	else if (prev == tmp) printk("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) {
+	sti();
+#if (NDEBUG & NDEBUG_ABORT)
+    printk("scsi%d : abort failed, command connected.\n", instance->host_no);
+#endif
+	return SCSI_ABORT_NOT_RUNNING;
+    }
+
+/*
+ * 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) {
+	    sti(); 
+#if (NDEBUG & NDEBUG_ABORT)
+    printk("scsi%d : aborting disconnected command.\n", instance->host_no);
+#endif
+  
+	    if (NCR5380_select (instance, cmd, (int) cmd->tag)) 
+		return SCSI_ABORT_BUSY;
+
+#if (NDEBUG & NDEBUG_ABORT)
+    printk("scsi%d : nexus reestablished.\n", instance->host_no);
+#endif
+
+	    do_abort (instance);
+
+	    cli();
+	    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;
+		    sti();
+		    tmp->done(tmp);
+		    return SCSI_ABORT_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.
+ */
+
+    sti();
+    printk("scsi%d : warning : SCSI command probably completed successfully\n"
+	   "         before abortion\n", instance->host_no); 
+    return SCSI_ABORT_NOT_RUNNING;
+}
+
+
+/* 
+ * Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
+ * 
+ * Purpose : reset the SCSI bus.
+ *
+ * Returns : SCSI_RESET_WAKEUP
+ *
+ */ 
+
+#ifndef NCR5380_reset
+static
+#endif
+int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int dummy) {
+    NCR5380_local_declare();
+    NCR5380_setup(cmd->host);
+
+    NCR5380_print_status (cmd->host);
+    do_reset (cmd->host);
+
+    return SCSI_RESET_WAKEUP;
+}
+