1 files changed, 3009 insertions, 0 deletions

diff --git a/drivers/scsi/sun3_NCR5380.c b/drivers/scsi/sun3_NCR5380.c
new file mode 100644
index 000000000000..90811390a37d
--- /dev/null
+++ b/drivers/scsi/sun3_NCR5380.c
@@ -0,0 +1,3009 @@
+/* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by 
+   Sam Creasey. */ 
+/* 
+ * 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
+ */
+
+/*
+ * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
+ * this file, too:
+ *
+ *  - Some of the debug statements were incorrect (undefined variables and the
+ *    like). I fixed that.
+ *
+ *  - In information_transfer(), I think a #ifdef was wrong. Looking at the
+ *    possible DMA transfer size should also happen for REAL_DMA. I added this
+ *    in the #if statement.
+ *
+ *  - When using real DMA, information_transfer() should return in a DATAOUT
+ *    phase after starting the DMA. It has nothing more to do.
+ *
+ *  - The interrupt service routine should run main after end of DMA, too (not
+ *    only after RESELECTION interrupts). Additionally, it should _not_ test
+ *    for more interrupts after running main, since a DMA process may have
+ *    been started and interrupts are turned on now. The new int could happen
+ *    inside the execution of NCR5380_intr(), leading to recursive
+ *    calls.
+ *
+ *  - I've added a function merge_contiguous_buffers() that tries to
+ *    merge scatter-gather buffers that are located at contiguous
+ *    physical addresses and can be processed with the same DMA setup.
+ *    Since most scatter-gather operations work on a page (4K) of
+ *    4 buffers (1K), in more than 90% of all cases three interrupts and
+ *    DMA setup actions are saved.
+ *
+ * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
+ *    and USLEEP, because these were messing up readability and will never be
+ *    needed for Atari SCSI.
+ * 
+ * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
+ *   stuff), and 'main' is executed in a bottom half if awoken by an
+ *   interrupt.
+ *
+ * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
+ *   constructs. In my eyes, this made the source rather unreadable, so I
+ *   finally replaced that by the *_PRINTK() macros.
+ *
+ */
+
+/*
+ * Further development / testing that should be done : 
+ * 1.  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
+#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 an architecture specific functions 
+ * and macros and include this file in your driver.
+ *
+ * These macros control options : 
+ * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
+ *      for commands that return with a CHECK CONDITION status. 
+ *
+ * LINKED - if defined, linked commands are supported.
+ *
+ * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
+ *
+ * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
+ *
+ * These macros MUST be defined :
+ * 
+ * NCR5380_read(register)  - read from the specified register
+ *
+ * NCR5380_write(register, value) - write to the specific register 
+ *
+ * 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 struct Scsi_Host *first_instance = NULL;
+static Scsi_Host_Template *the_template = NULL;
+
+/* Macros ease life... :-) */
+#define SETUP_HOSTDATA(in)                              \
+    struct NCR5380_hostdata *hostdata =                 \
+        (struct NCR5380_hostdata *)(in)->hostdata
+#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
+
+#define NEXT(cmd)       ((Scsi_Cmnd *)((cmd)->host_scribble))
+#define NEXTADDR(cmd)   ((Scsi_Cmnd **)&((cmd)->host_scribble))
+
+#define HOSTNO          instance->host_no
+#define H_NO(cmd)       (cmd)->device->host->host_no
+
+#define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \
+                        (buffer)->offset)
+
+#ifdef SUPPORT_TAGS
+
+/*
+ * Functions for handling tagged queuing
+ * =====================================
+ *
+ * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
+ *
+ * Using consecutive numbers for the tags is no good idea in my eyes. There
+ * could be wrong re-usings if the counter (8 bit!) wraps and some early
+ * command has been preempted for a long time. My solution: a bitfield for
+ * remembering used tags.
+ *
+ * There's also the problem that each target has a certain queue size, but we
+ * cannot know it in advance :-( We just see a QUEUE_FULL status being
+ * returned. So, in this case, the driver internal queue size assumption is
+ * reduced to the number of active tags if QUEUE_FULL is returned by the
+ * target. The command is returned to the mid-level, but with status changed
+ * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
+ * correctly.
+ *
+ * We're also not allowed running tagged commands as long as an untagged
+ * command is active. And REQUEST SENSE commands after a contingent allegiance
+ * condition _must_ be untagged. To keep track whether an untagged command has
+ * been issued, the host->busy array is still employed, as it is without
+ * support for tagged queuing.
+ *
+ * One could suspect that there are possible race conditions between
+ * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
+ * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
+ * which already guaranteed to be running at most once. It is also the only
+ * place where tags/LUNs are allocated. So no other allocation can slip
+ * between that pair, there could only happen a reselection, which can free a
+ * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
+ * important: the tag bit must be cleared before 'nr_allocated' is decreased.
+ */
+
+/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
+#undef TAG_NONE
+#define TAG_NONE 0xff
+
+/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
+#if (MAX_TAGS % 32) != 0
+#error "MAX_TAGS must be a multiple of 32!"
+#endif
+
+typedef struct {
+    char        allocated[MAX_TAGS/8];
+    int         nr_allocated;
+    int         queue_size;
+} TAG_ALLOC;
+
+static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
+
+
+static void __init init_tags( void )
+{
+    int target, lun;
+    TAG_ALLOC *ta;
+    
+    if (!setup_use_tagged_queuing)
+        return;
+    
+    for( target = 0; target < 8; ++target ) {
+        for( lun = 0; lun < 8; ++lun ) {
+            ta = &TagAlloc[target][lun];
+            memset( &ta->allocated, 0, MAX_TAGS/8 );
+            ta->nr_allocated = 0;
+            /* At the beginning, assume the maximum queue size we could
+             * support (MAX_TAGS). This value will be decreased if the target
+             * returns QUEUE_FULL status.
+             */
+            ta->queue_size = MAX_TAGS;
+        }
+    }
+}
+
+
+/* Check if we can issue a command to this LUN: First see if the LUN is marked
+ * busy by an untagged command. If the command should use tagged queuing, also
+ * check that there is a free tag and the target's queue won't overflow. This
+ * function should be called with interrupts disabled to avoid race
+ * conditions.
+ */ 
+
+static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged )
+{
+    SETUP_HOSTDATA(cmd->device->host);
+
+    if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
+        return( 1 );
+    if (!should_be_tagged ||
+        !setup_use_tagged_queuing || !cmd->device->tagged_supported)
+        return( 0 );
+    if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
+        TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
+        TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
+                    H_NO(cmd), cmd->device->id, cmd->device->lun );
+        return( 1 );
+    }
+    return( 0 );
+}
+
+
+/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
+ * must be called before!), or reserve the LUN in 'busy' if the command is
+ * untagged.
+ */
+
+static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged )
+{
+    SETUP_HOSTDATA(cmd->device->host);
+
+    /* If we or the target don't support tagged queuing, allocate the LUN for
+     * an untagged command.
+     */
+    if (!should_be_tagged ||
+        !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
+        cmd->tag = TAG_NONE;
+        hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
+        TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
+                    "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
+    }
+    else {
+        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
+
+        cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
+        set_bit( cmd->tag, &ta->allocated );
+        ta->nr_allocated++;
+        TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
+                    "(now %d tags in use)\n",
+                    H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
+                    ta->nr_allocated );
+    }
+}
+
+
+/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
+ * unlock the LUN.
+ */
+
+static void cmd_free_tag( Scsi_Cmnd *cmd )
+{
+    SETUP_HOSTDATA(cmd->device->host);
+
+    if (cmd->tag == TAG_NONE) {
+        hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+        TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
+                    H_NO(cmd), cmd->device->id, cmd->device->lun );
+    }
+    else if (cmd->tag >= MAX_TAGS) {
+        printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
+                H_NO(cmd), cmd->tag );
+    }
+    else {
+        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
+        clear_bit( cmd->tag, &ta->allocated );
+        ta->nr_allocated--;
+        TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
+                    H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
+    }
+}
+
+
+static void free_all_tags( void )
+{
+    int target, lun;
+    TAG_ALLOC *ta;
+
+    if (!setup_use_tagged_queuing)
+        return;
+    
+    for( target = 0; target < 8; ++target ) {
+        for( lun = 0; lun < 8; ++lun ) {
+            ta = &TagAlloc[target][lun];
+            memset( &ta->allocated, 0, MAX_TAGS/8 );
+            ta->nr_allocated = 0;
+        }
+    }
+}
+
+#endif /* SUPPORT_TAGS */
+
+
+/*
+ * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
+ *
+ * Purpose: Try to merge several scatter-gather requests into one DMA
+ *    transfer. This is possible if the scatter buffers lie on
+ *    physical contiguous addresses.
+ *
+ * Parameters: Scsi_Cmnd *cmd
+ *    The command to work on. The first scatter buffer's data are
+ *    assumed to be already transfered into ptr/this_residual.
+ */
+
+static void merge_contiguous_buffers( Scsi_Cmnd *cmd )
+{
+    unsigned long endaddr;
+#if (NDEBUG & NDEBUG_MERGING)
+    unsigned long oldlen = cmd->SCp.this_residual;
+    int           cnt = 1;
+#endif
+
+    for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
+         cmd->SCp.buffers_residual &&
+         virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
+        
+        MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
+                   SGADDR(&(cmd->SCp.buffer[1])), endaddr);
+#if (NDEBUG & NDEBUG_MERGING)
+        ++cnt;
+#endif
+        ++cmd->SCp.buffer;
+        --cmd->SCp.buffers_residual;
+        cmd->SCp.this_residual += cmd->SCp.buffer->length;
+        endaddr += cmd->SCp.buffer->length;
+    }
+#if (NDEBUG & NDEBUG_MERGING)
+    if (oldlen != cmd->SCp.this_residual)
+        MER_PRINTK("merged %d buffers from %p, new length %08x\n",
+                   cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
+#endif
+}
+
+/*
+ * 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 *) SGADDR(cmd->SCp.buffer);
+        cmd->SCp.this_residual = cmd->SCp.buffer->length;
+
+        /* ++roman: Try to merge some scatter-buffers if they are at
+         * contiguous physical addresses.
+         */
+//      merge_contiguous_buffers( cmd );
+    } 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/config.h>
+#include <linux/delay.h>
+
+#if 1
+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_ENABLE_EOP_INTR,"MODE EOP 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) {
+    unsigned char status, data, basr, mr, icr, i;
+    unsigned long flags;
+
+    local_irq_save(flags);
+    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);
+    local_irq_restore(flags);
+    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)
+{
+    unsigned char status;
+    int i;
+
+    status = NCR5380_read(STATUS_REG);
+    if (!(status & SR_REQ)) 
+        printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
+    else {
+        for (i = 0; (phases[i].value != PHASE_UNKNOWN) && 
+            (phases[i].value != (status & PHASE_MASK)); ++i); 
+        printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
+    }
+}
+
+#else /* !NDEBUG */
+
+/* dummies... */
+__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
+__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
+
+#endif
+
+/*
+ * ++roman: New scheme of calling NCR5380_main()
+ * 
+ * If we're not in an interrupt, we can call our main directly, it cannot be
+ * already running. Else, we queue it on a task queue, if not 'main_running'
+ * tells us that a lower level is already executing it. This way,
+ * 'main_running' needs not be protected in a special way.
+ *
+ * queue_main() is a utility function for putting our main onto the task
+ * queue, if main_running is false. It should be called only from a
+ * interrupt or bottom half.
+ */
+
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+
+static volatile int main_running = 0;
+static DECLARE_WORK(NCR5380_tqueue, (void (*)(void*))NCR5380_main, NULL);
+
+static __inline__ void queue_main(void)
+{
+    if (!main_running) {
+        /* If in interrupt and NCR5380_main() not already running,
+           queue it on the 'immediate' task queue, to be processed
+           immediately after the current interrupt processing has
+           finished. */
+        schedule_work(&NCR5380_tqueue);
+    }
+    /* else: nothing to do: the running NCR5380_main() will pick up
+       any newly queued command. */
+}
+
+
+static inline void NCR5380_all_init (void)
+{
+    static int done = 0;
+    if (!done) {
+        INI_PRINTK("scsi : NCR5380_all_init()\n");
+        done = 1;
+    }
+}
+
+ 
+/*
+ * 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 __init NCR5380_print_options (struct Scsi_Host *instance)
+{
+    printk(" generic options"
+#ifdef AUTOSENSE 
+    " AUTOSENSE"
+#endif
+#ifdef REAL_DMA
+    " REAL DMA"
+#endif
+#ifdef PARITY
+    " PARITY"
+#endif
+#ifdef SUPPORT_TAGS
+    " SCSI-2 TAGGED QUEUING"
+#endif
+    );
+    printk(" generic release=%d", NCR5380_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)
+{
+    char *pr_bfr;
+    char *start;
+    int len;
+
+    NCR_PRINT(NDEBUG_ANY);
+    NCR_PRINT_PHASE(NDEBUG_ANY);
+
+    pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
+    if (!pr_bfr) {
+        printk("NCR5380_print_status: no memory for print buffer\n");
+        return;
+    }
+    len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
+    pr_bfr[len] = 0;
+    printk("\n%s\n", pr_bfr);
+    free_page((unsigned long) 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(fmt,args...) \
+  do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
+         pos += sprintf(pos, fmt , ## args); } while(0)
+static
+char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
+
+static int NCR5380_proc_info (struct Scsi_Host *instance, char *buffer, char **start,
+                       off_t offset, int length, int inout)
+{
+    char *pos = buffer;
+    struct NCR5380_hostdata *hostdata;
+    Scsi_Cmnd *ptr;
+    unsigned long flags;
+    off_t begin = 0;
+#define check_offset()                          \
+    do {                                        \
+        if (pos - buffer < offset - begin) {    \
+            begin += pos - buffer;              \
+            pos = buffer;                       \
+        }                                       \
+    } while (0)
+
+    hostdata = (struct NCR5380_hostdata *)instance->hostdata;
+
+    if (inout) { /* Has data been written to the file ? */
+        return(-ENOSYS);  /* Currently this is a no-op */
+    }
+    SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
+    check_offset();
+    local_irq_save(flags);
+    SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
+    check_offset();
+    if (!hostdata->connected)
+        SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
+    else
+        pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
+                                pos, buffer, length);
+    SPRINTF("scsi%d: issue_queue\n", HOSTNO);
+    check_offset();
+    for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
+        pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
+        check_offset();
+    }
+
+    SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
+    check_offset();
+    for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
+         ptr = NEXT(ptr)) {
+        pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
+        check_offset();
+    }
+
+    local_irq_restore(flags);
+    *start = buffer + (offset - begin);
+    if (pos - buffer < offset - begin)
+        return 0;
+    else if (pos - buffer - (offset - begin) < length)
+        return pos - buffer - (offset - begin);
+    return length;
+}
+
+static char *
+lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
+{
+    int i, s;
+    unsigned char *command;
+    SPRINTF("scsi%d: destination target %d, lun %d\n",
+            H_NO(cmd), cmd->device->id, cmd->device->lun);
+    SPRINTF("        command = ");
+    command = cmd->cmnd;
+    SPRINTF("%2d (0x%02x)", command[0], command[0]);
+    for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
+        SPRINTF(" %02x", command[i]);
+    SPRINTF("\n");
+    return pos;
+}
+
+
+/* 
+ * Function : void NCR5380_init (struct Scsi_Host *instance)
+ *
+ * Purpose : initializes *instance and corresponding 5380 chip.
+ *
+ * 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 int NCR5380_init (struct Scsi_Host *instance, int flags)
+{
+    int i;
+    SETUP_HOSTDATA(instance);
+
+    NCR5380_all_init();
+
+    hostdata->aborted = 0;
+    hostdata->id_mask = 1 << instance->this_id;
+    hostdata->id_higher_mask = 0;
+    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 SUPPORT_TAGS
+    init_tags();
+#endif
+#if defined (REAL_DMA)
+    hostdata->dma_len = 0;
+#endif
+    hostdata->targets_present = 0;
+    hostdata->connected = NULL;
+    hostdata->issue_queue = NULL;
+    hostdata->disconnected_queue = NULL;
+    hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
+
+    if (!the_template) {
+        the_template = instance->hostt;
+        first_instance = instance;
+    }
+        
+
+#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", HOSTNO);
+#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);
+
+    return 0;
+}
+
+/* 
+ * 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 */
+static int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
+{
+    SETUP_HOSTDATA(cmd->device->host);
+    Scsi_Cmnd *tmp;
+    unsigned long flags;
+
+#if (NDEBUG & NDEBUG_NO_WRITE)
+    switch (cmd->cmnd[0]) {
+    case WRITE_6:
+    case WRITE_10:
+        printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
+               H_NO(cmd));
+        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->device->id] -= (jiffies - hostdata->timebase);
+                hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
+                hostdata->pendingw++;
+                break;
+            case READ:
+            case READ_6:
+            case READ_10:
+                hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
+                hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
+                hostdata->pendingr++;
+                break;
+        }
+#endif
+
+    /* 
+     * We use the host_scribble field as a pointer to the next command  
+     * in a queue 
+     */
+
+    NEXT(cmd) = 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.
+     */
+
+    local_irq_save(flags);
+    /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
+     * Otherwise a running NCR5380_main may steal the lock.
+     * Lock before actually inserting due to fairness reasons explained in
+     * atari_scsi.c. If we insert first, then it's impossible for this driver
+     * to release the lock.
+     * Stop timer for this command while waiting for the lock, or timeouts
+     * may happen (and they really do), and it's no good if the command doesn't
+     * appear in any of the queues.
+     * ++roman: Just disabling the NCR interrupt isn't sufficient here,
+     * because also a timer int can trigger an abort or reset, which would
+     * alter queues and touch the lock.
+     */
+    if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
+        LIST(cmd, hostdata->issue_queue);
+        NEXT(cmd) = hostdata->issue_queue;
+        hostdata->issue_queue = cmd;
+    } else {
+        for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
+             NEXT(tmp); tmp = NEXT(tmp))
+            ;
+        LIST(cmd, tmp);
+        NEXT(tmp) = cmd;
+    }
+
+    local_irq_restore(flags);
+
+    QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
+              (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
+
+    /* If queue_command() is called from an interrupt (real one or bottom
+     * half), we let queue_main() do the job of taking care about main. If it
+     * is already running, this is a no-op, else main will be queued.
+     *
+     * If we're not in an interrupt, we can call NCR5380_main()
+     * unconditionally, because it cannot be already running.
+     */
+    if (in_interrupt() || ((flags >> 8) & 7) >= 6)
+        queue_main();
+    else
+        NCR5380_main(NULL);
+    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 *bl)
+{
+    Scsi_Cmnd *tmp, *prev;
+    struct Scsi_Host *instance = first_instance;
+    struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
+    int done;
+    unsigned long flags;
+    
+    /*
+     * 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.
+     * 
+     * ++roman: Just disabling the NCR interrupt isn't sufficient here,
+     * because also a timer int can trigger an abort or reset, which can
+     * alter queues and touch the Falcon lock.
+     */
+
+    /* Tell int handlers main() is now already executing.  Note that
+       no races are possible here. If an int comes in before
+       'main_running' is set here, and queues/executes main via the
+       task queue, it doesn't do any harm, just this instance of main
+       won't find any work left to do. */
+    if (main_running)
+        return;
+    main_running = 1;
+
+    local_save_flags(flags);
+    do {
+        local_irq_disable(); /* Freeze request queues */
+        done = 1;
+        
+        if (!hostdata->connected) {
+            MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
+            /*
+             * 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 = NEXT(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 = NEXT(tmp) ) {
+
+#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. */
+                /* ++guenther: possible race with Falcon locking */
+                if (
+#ifdef SUPPORT_TAGS
+                    !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
+#else
+                    !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
+#endif
+                    ) {
+                    /* ++guenther: just to be sure, this must be atomic */
+                    local_irq_disable();
+                    if (prev) {
+                        REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
+                        NEXT(prev) = NEXT(tmp);
+                    } else {
+                        REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
+                        hostdata->issue_queue = NEXT(tmp);
+                    }
+                    NEXT(tmp) = NULL;
+                    
+                    /* reenable interrupts after finding one */
+                    local_irq_restore(flags);
+                    
+                    /* 
+                     * 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.     
+                     */
+                    MAIN_PRINTK("scsi%d: main(): command for target %d "
+                                "lun %d removed from issue_queue\n",
+                                HOSTNO, tmp->target, tmp->lun);
+                    /* 
+                     * REQUEST SENSE commands are issued without tagged
+                     * queueing, even on SCSI-II devices because the 
+                     * contingent allegiance condition exists for the 
+                     * entire unit.
+                     */
+                    /* ++roman: ...and the standard also requires that
+                     * REQUEST SENSE command are untagged.
+                     */
+                    
+#ifdef SUPPORT_TAGS
+                    cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
+#endif
+                    if (!NCR5380_select(instance, tmp, 
+                            (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : 
+                            TAG_NEXT)) {
+                        break;
+                    } else {
+                        local_irq_disable();
+                        LIST(tmp, hostdata->issue_queue);
+                        NEXT(tmp) = hostdata->issue_queue;
+                        hostdata->issue_queue = tmp;
+#ifdef SUPPORT_TAGS
+                        cmd_free_tag( tmp );
+#endif
+                        local_irq_restore(flags);
+                        MAIN_PRINTK("scsi%d: main(): select() failed, "
+                                    "returned to issue_queue\n", HOSTNO);
+                        if (hostdata->connected)
+                            break;
+                    }
+                } /* if target/lun/target queue is not busy */
+            } /* for issue_queue */
+        } /* if (!hostdata->connected) */
+        if (hostdata->connected 
+#ifdef REAL_DMA
+            && !hostdata->dma_len
+#endif
+            ) {
+            local_irq_restore(flags);
+            MAIN_PRINTK("scsi%d: main: performing information transfer\n",
+                        HOSTNO);
+            NCR5380_information_transfer(instance);
+            MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
+            done = 0;
+        }
+    } while (!done);
+
+    /* Better allow ints _after_ 'main_running' has been cleared, else
+       an interrupt could believe we'll pick up the work it left for
+       us, but we won't see it anymore here... */
+    main_running = 0;
+    local_irq_restore(flags);
+}
+
+
+#ifdef REAL_DMA
+/*
+ * 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.
+ *
+ */
+
+static void NCR5380_dma_complete( struct Scsi_Host *instance )
+{
+    SETUP_HOSTDATA(instance);
+    int           transfered;
+    unsigned char **data;
+    volatile int  *count;
+
+    if (!hostdata->connected) {
+        printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
+               "no connected cmd\n", HOSTNO);
+        return;
+    }
+
+    DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
+               HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
+               NCR5380_read(STATUS_REG));
+
+    if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
+            printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
+            printk("please e-mail sammy@sammy.net with a description of how this\n");
+            printk("error was produced.\n");
+            BUG();
+    }
+
+    /* make sure we're not stuck in a data phase */
+    if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
+                                            BASR_ACK)) ==
+       (BASR_PHASE_MATCH | BASR_ACK)) {
+            printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
+            printk("scsi%d: bus stuck in data phase -- probably a single byte "
+                   "overrun!\n", HOSTNO);
+            printk("not prepared for this error!\n");
+            printk("please e-mail sammy@sammy.net with a description of how this\n");
+            printk("error was produced.\n");
+            BUG();
+    }
+
+
+
+    (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+    NCR5380_write(MODE_REG, MR_BASE);
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+    transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
+    hostdata->dma_len = 0;
+
+    data = (unsigned char **) &(hostdata->connected->SCp.ptr);
+    count = &(hostdata->connected->SCp.this_residual);
+    *data += transfered;
+    *count -= transfered;
+
+}
+#endif /* REAL_DMA */
+
+
+/*
+ * 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 irqreturn_t NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs)
+{
+    struct Scsi_Host *instance = first_instance;
+    int done = 1, handled = 0;
+    unsigned char basr;
+
+    INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
+
+    /* Look for pending interrupts */
+    basr = NCR5380_read(BUS_AND_STATUS_REG);
+    INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
+    /* dispatch to appropriate routine if found and done=0 */
+    if (basr & BASR_IRQ) {
+        NCR_PRINT(NDEBUG_INTR);
+        if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
+            done = 0;
+            ENABLE_IRQ();
+            INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
+            NCR5380_reselect(instance);
+            (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+        }
+        else if (basr & BASR_PARITY_ERROR) {
+            INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
+            (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+        }
+        else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
+            INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
+            (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+        }
+        else {
+            /*  
+             * The rest of the interrupt conditions can occur only during a
+             * DMA transfer
+             */
+
+#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_MODE) &&
+                ((basr & BASR_END_DMA_TRANSFER) || 
+                 !(basr & BASR_PHASE_MATCH))) {
+                    
+                INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
+                NCR5380_dma_complete( instance );
+                done = 0;
+                ENABLE_IRQ();
+            } else
+#endif /* REAL_DMA */
+            {
+/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
+                if (basr & BASR_PHASE_MATCH)
+                   INT_PRINTK("scsi%d: unknown interrupt, "
+                           "BASR 0x%x, MR 0x%x, SR 0x%x\n",
+                           HOSTNO, basr, NCR5380_read(MODE_REG),
+                           NCR5380_read(STATUS_REG));
+                (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+#ifdef SUN3_SCSI_VME
+                dregs->csr |= CSR_DMA_ENABLE;
+#endif
+            }
+        } /* if !(SELECTION || PARITY) */
+        handled = 1;
+    } /* BASR & IRQ */
+    else {
+
+        printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
+               "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
+               NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
+        (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+#ifdef SUN3_SCSI_VME
+                dregs->csr |= CSR_DMA_ENABLE;
+#endif
+    }
+    
+    if (!done) {
+        INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
+        /* Put a call to NCR5380_main() on the queue... */
+        queue_main();
+    }
+    return IRQ_RETVAL(handled);
+}
+
+#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->device->id] += (jiffies - hostdata->timebase);
+                /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
+                hostdata->pendingw--;
+                break;
+            case READ:
+            case READ_6:
+            case READ_10:
+                hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
+                /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
+                hostdata->pendingr--;
+                break;
+        }
+}
+#endif
+
+/* 
+ * 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)
+{
+    SETUP_HOSTDATA(instance);
+    unsigned char tmp[3], phase;
+    unsigned char *data;
+    int len;
+    unsigned long timeout;
+    unsigned long flags;
+
+    hostdata->restart_select = 0;
+    NCR_PRINT(NDEBUG_ARBITRATION);
+    ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
+               instance->this_id);
+
+    /* 
+     * Set the phase bits to 0, otherwise the NCR5380 won't drive the 
+     * data bus during SELECTION.
+     */
+
+    local_irq_save(flags);
+    if (hostdata->connected) {
+        local_irq_restore(flags);
+        return -1;
+    }
+    NCR5380_write(TARGET_COMMAND_REG, 0);
+
+
+    /* 
+     * Start arbitration.
+     */
+    
+    NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+    NCR5380_write(MODE_REG, MR_ARBITRATE);
+
+    local_irq_restore(flags);
+
+    /* 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)
+           && time_before(jiffies, timeout) && !hostdata->connected)
+        ;
+      if (time_after_eq(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)
+         && !hostdata->connected);
+#endif
+
+    ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
+
+    if (hostdata->connected) {
+        NCR5380_write(MODE_REG, MR_BASE); 
+        return -1;
+    }
+    /* 
+     * 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) ||
+        hostdata->connected) {
+        NCR5380_write(MODE_REG, MR_BASE); 
+        ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
+                   HOSTNO);
+        return -1;
+    }
+
+     /* after/during arbitration, BSY should be asserted.
+        IBM DPES-31080 Version S31Q works now */
+     /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
+                                         ICR_ASSERT_BSY ) ;
+    
+    if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
+        hostdata->connected) {
+        NCR5380_write(MODE_REG, MR_BASE);
+        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+        ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
+                   HOSTNO);
+        return -1;
+    }
+
+    /* 
+     * Again, bus clear + bus settle time is 1.2us, however, this is 
+     * a minimum so we'll udelay ceil(1.2)
+     */
+
+#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
+    /* ++roman: But some targets (see above :-) seem to need a bit more... */
+    udelay(15);
+#else
+    udelay(2);
+#endif
+    
+    if (hostdata->connected) {
+        NCR5380_write(MODE_REG, MR_BASE);
+        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+        return -1;
+    }
+
+    ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
+
+    /* 
+     * Now that we have won arbitration, start Selection process, asserting 
+     * the host and target ID's on the SCSI bus.
+     */
+
+    NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
+
+    /* 
+     * Raise ATN while SEL is true before BSY goes false from arbitration,
+     * since this is the only way to guarantee that we'll get a MESSAGE OUT
+     * phase immediately after selection.
+     */
+
+    NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | 
+        ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
+    NCR5380_write(MODE_REG, MR_BASE);
+
+    /* 
+     * Reselect interrupts must be turned off prior to the dropping of BSY,
+     * otherwise we will trigger an interrupt.
+     */
+
+    if (hostdata->connected) {
+        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+        return -1;
+    }
+
+    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);
+
+    SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
+
+    /* 
+     * The SCSI specification calls for a 250 ms timeout for the actual 
+     * selection.
+     */
+
+    timeout = jiffies + 25; 
+
+    /* 
+     * 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.
+     */
+
+#if 0
+    /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
+     * IO while SEL is true. But again, there are some disks out the in the
+     * world that do that nevertheless. (Somebody claimed that this announces
+     * reselection capability of the target.) So we better skip that test and
+     * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
+     */
+
+    while (time_before(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 (KERN_ERR "scsi%d: reselection after won arbitration?\n",
+                    HOSTNO);
+            NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+            return -1;
+    }
+#else
+    while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
+#endif
+
+    /* 
+     * No less than two deskew delays after the initiator detects the 
+     * BSY signal is true, it shall release the SEL signal and may 
+     * change the DATA BUS.                                     -wingel
+     */
+
+    udelay(1);
+
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+
+    if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
+        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+        if (hostdata->targets_present & (1 << cmd->device->id)) {
+            printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
+            if (hostdata->restart_select)
+                printk(KERN_NOTICE "\trestart select\n");
+            NCR_PRINT(NDEBUG_ANY);
+            NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+            return -1;
+        }
+        cmd->result = DID_BAD_TARGET << 16;
+#ifdef NCR5380_STATS
+        collect_stats(hostdata, cmd);
+#endif
+#ifdef SUPPORT_TAGS
+        cmd_free_tag( cmd );
+#endif
+        cmd->scsi_done(cmd);
+        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+        SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
+        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+        return 0;
+    } 
+
+    hostdata->targets_present |= (1 << cmd->device->id);
+
+    /*
+     * Since we followed the SCSI spec, and raised ATN while SEL 
+     * was true but before BSY was false during selection, the information
+     * transfer phase should be a MESSAGE OUT phase so that we can send the
+     * IDENTIFY message.
+     * 
+     * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
+     * message (2 bytes) with a tag ID that we increment with every command
+     * until it wraps back to 0.
+     *
+     * XXX - it turns out that there are some broken SCSI-II devices,
+     *       which claim to support tagged queuing but fail when more than
+     *       some number of commands are issued at once.
+     */
+
+    /* Wait for start of REQ/ACK handshake */
+    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
+
+    SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
+               HOSTNO, cmd->device->id);
+    tmp[0] = IDENTIFY(1, cmd->device->lun);
+
+#ifdef SUPPORT_TAGS
+    if (cmd->tag != TAG_NONE) {
+        tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
+        tmp[2] = cmd->tag;
+        len = 3;
+    } else 
+        len = 1;
+#else
+    len = 1;
+    cmd->tag=0;
+#endif /* SUPPORT_TAGS */
+
+    /* Send message(s) */
+    data = tmp;
+    phase = PHASE_MSGOUT;
+    NCR5380_transfer_pio(instance, &phase, &len, &data);
+    SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
+    /* XXX need to handle errors here */
+    hostdata->connected = cmd;
+#ifndef SUPPORT_TAGS
+    hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
+#endif    
+#ifdef SUN3_SCSI_VME
+    dregs->csr |= CSR_INTR;
+#endif
+    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 are 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)
+{
+    register unsigned char p = *phase, tmp;
+    register int c = *count;
+    register unsigned char *d = *data;
+
+    /* 
+     * 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));
+
+        HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
+
+        /* Check for phase mismatch */  
+        if ((tmp & PHASE_MASK) != p) {
+            PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
+            NCR_PRINT_PHASE(NDEBUG_PIO);
+            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);
+                NCR_PRINT(NDEBUG_PIO);
+                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);
+                NCR_PRINT(NDEBUG_PIO);
+                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
+                    ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+            }
+        } else {
+            NCR_PRINT(NDEBUG_PIO);
+            NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
+        }
+
+        while (NCR5380_read(STATUS_REG) & SR_REQ);
+
+        HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
+
+/*
+ * 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);
+
+    PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
+
+    *count = c;
+    *data = d;
+    tmp = NCR5380_read(STATUS_REG);
+    /* The phase read from the bus is valid if either REQ is (already)
+     * asserted or if ACK hasn't been released yet. The latter is the case if
+     * we're in MSGIN and all wanted bytes have been received. */
+    if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
+        *phase = tmp & PHASE_MASK;
+    else 
+        *phase = PHASE_UNKNOWN;
+
+    if (!c || (*phase == p))
+        return 0;
+    else 
+        return -1;
+}
+
+/*
+ * 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) 
+{
+    unsigned char tmp, *msgptr, phase;
+    int len;
+
+    /* 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)
+/* 
+ * 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)
+{
+    SETUP_HOSTDATA(instance);
+    register int c = *count;
+    register unsigned char p = *phase;
+    unsigned long flags;
+
+    /* sanity check */
+    if(!sun3_dma_setup_done) {
+         printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
+         BUG();
+    }
+    hostdata->dma_len = c;
+
+    DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
+               HOSTNO, (p & SR_IO) ? "reading" : "writing",
+               c, (p & SR_IO) ? "to" : "from", *data);
+
+    /* netbsd turns off ints here, why not be safe and do it too */
+    local_irq_save(flags);
+    
+    /* send start chain */
+    sun3scsi_dma_start(c, *data);
+    
+    if (p & SR_IO) {
+            NCR5380_write(TARGET_COMMAND_REG, 1);
+            NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+            NCR5380_write(INITIATOR_COMMAND_REG, 0);
+            NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
+            NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
+    } else {
+            NCR5380_write(TARGET_COMMAND_REG, 0);
+            NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+            NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
+            NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
+            NCR5380_write(START_DMA_SEND_REG, 0);
+    }
+
+#ifdef SUN3_SCSI_VME
+    dregs->csr |= CSR_DMA_ENABLE;
+#endif
+
+    local_irq_restore(flags);
+
+    sun3_dma_active = 1;
+    return 0;
+}
+#endif /* defined(REAL_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)
+{
+    SETUP_HOSTDATA(instance);
+    unsigned long flags;
+    unsigned char msgout = NOP;
+    int sink = 0;
+    int len;
+#if defined(REAL_DMA)
+    int transfersize;
+#endif
+    unsigned char *data;
+    unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
+    Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
+
+#ifdef SUN3_SCSI_VME
+    dregs->csr |= CSR_INTR;
+#endif
+
+    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;
+                NCR_PRINT_PHASE(NDEBUG_INFORMATION);
+            }
+
+            if(phase == PHASE_CMDOUT) {
+                    void *d;
+                    unsigned long count;
+
+                if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
+                        count = cmd->SCp.buffer->length;
+                        d = SGADDR(cmd->SCp.buffer);
+                } else {
+                        count = cmd->SCp.this_residual;
+                        d = cmd->SCp.ptr;
+                }
+#ifdef REAL_DMA
+                /* this command setup for dma yet? */
+                if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
+                                                  != cmd))
+                {
+                        if(cmd->request->flags & REQ_CMD) {
+                                sun3scsi_dma_setup(d, count,
+                                                   rq_data_dir(cmd->request));
+                                sun3_dma_setup_done = cmd;
+                        }
+                }
+#endif
+#ifdef SUN3_SCSI_VME
+                dregs->csr |= CSR_INTR;
+#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_DATAOUT:
+#if (NDEBUG & NDEBUG_NO_DATAOUT)
+                printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
+                       "aborted\n", HOSTNO);
+                sink = 1;
+                do_abort(instance);
+                cmd->result = DID_ERROR  << 16;
+                cmd->done(cmd);
+                return;
+#endif
+            case PHASE_DATAIN:
+                /* 
+                 * 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 = SGADDR(cmd->SCp.buffer);
+
+                    /* ++roman: Try to merge some scatter-buffers if
+                     * they are at contiguous physical addresses.
+                     */
+//                  merge_contiguous_buffers( cmd );
+                    INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
+                               HOSTNO, cmd->SCp.this_residual,
+                               cmd->SCp.buffers_residual);
+                }
+
+                /*
+                 * The preferred transfer method is going to be 
+                 * PSEUDO-DMA for systems that are strictly PIO,
+                 * since we can let the hardware do the handshaking.
+                 *
+                 * For this to work, we need to know the transfersize
+                 * ahead of time, since the pseudo-DMA code will sit
+                 * in an unconditional loop.
+                 */
+
+/* ++roman: I suggest, this should be
+ *   #if def(REAL_DMA)
+ * instead of leaving REAL_DMA out.
+ */
+
+#if defined(REAL_DMA)
+//              if (!cmd->device->borken &&
+                if((transfersize =
+                    NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
+                    len = transfersize;
+                    cmd->SCp.phase = phase;
+
+                    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(KERN_NOTICE "scsi%d: switching target %d "
+                               "lun %d to slow handshake\n", HOSTNO,
+                               cmd->device->id, cmd->device->lun);
+                        cmd->device->borken = 1;
+                        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
+                            ICR_ASSERT_ATN);
+                        sink = 1;
+                        do_abort(instance);
+                        cmd->result = DID_ERROR  << 16;
+                        cmd->done(cmd);
+                        /* XXX - need to source or sink data here, as appropriate */
+                    } else {
+#ifdef REAL_DMA
+                        /* ++roman: When using real DMA,
+                         * information_transfer() should return after
+                         * starting DMA since it has nothing more to
+                         * do.
+                         */
+                                    return;
+#else                   
+                        cmd->SCp.this_residual -= transfersize - len;
+#endif
+                    }
+                } else 
+#endif /* defined(REAL_DMA) */
+                  NCR5380_transfer_pio(instance, &phase, 
+                    (int *) &cmd->SCp.this_residual, (unsigned char **)
+                    &cmd->SCp.ptr);
+#ifdef REAL_DMA
+                /* if we had intended to dma that command clear it */
+                if(sun3_dma_setup_done == cmd)
+                        sun3_dma_setup_done = NULL;
+#endif
+
+                break;
+            case PHASE_MSGIN:
+                len = 1;
+                data = &tmp;
+                NCR5380_write(SELECT_ENABLE_REG, 0);    /* disable reselects */
+                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);
+                    
+                    LNK_PRINTK("scsi%d: target %d lun %d linked command "
+                               "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
+
+                    /* Enable reselect interrupts */
+                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+                    /*
+                     * 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(KERN_NOTICE "scsi%d: target %d lun %d "
+                                "linked command complete, no next_link\n",
+                                HOSTNO, cmd->device->id, cmd->device->lun);
+                            sink = 1;
+                            do_abort (instance);
+                            return;
+                    }
+
+                    initialize_SCp(cmd->next_link);
+                    /* The next command is still part of this process; copy it
+                     * and don't free it! */
+                    cmd->next_link->tag = cmd->tag;
+                    cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 
+                    LNK_PRINTK("scsi%d: target %d lun %d linked request "
+                               "done, calling scsi_done().\n",
+                               HOSTNO, cmd->device->id, cmd->device->lun);
+#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 */
+                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+                    hostdata->connected = NULL;
+                    QU_PRINTK("scsi%d: command for target %d, lun %d "
+                              "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
+#ifdef SUPPORT_TAGS
+                    cmd_free_tag( cmd );
+                    if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
+                        /* Turn a QUEUE FULL status into BUSY, I think the
+                         * mid level cannot handle QUEUE FULL :-( (The
+                         * command is retried after BUSY). Also update our
+                         * queue size to the number of currently issued
+                         * commands now.
+                         */
+                        /* ++Andreas: the mid level code knows about
+                           QUEUE_FULL now. */
+                        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
+                        TAG_PRINTK("scsi%d: target %d lun %d returned "
+                                   "QUEUE_FULL after %d commands\n",
+                                   HOSTNO, cmd->device->id, cmd->device->lun,
+                                   ta->nr_allocated);
+                        if (ta->queue_size > ta->nr_allocated)
+                            ta->nr_allocated = ta->queue_size;
+                    }
+#else
+                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+#endif
+                    /* Enable reselect interrupts */
+                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+
+                    /* 
+                     * I'm not sure what the correct thing to do here is : 
+                     * 
+                     * If the command that just executed is NOT a request 
+                     * sense, the obvious thing to do is to set the result
+                     * code to the values of the stored parameters.
+                     * 
+                     * If it was a REQUEST SENSE command, we need some way to
+                     * differentiate between the failure code of the original
+                     * and the failure code of the REQUEST sense - the obvious
+                     * case is success, where we fall through and leave the
+                     * result code unchanged.
+                     * 
+                     * The non-obvious place is where the REQUEST SENSE failed
+                     */
+
+                    if (cmd->cmnd[0] != REQUEST_SENSE) 
+                        cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 
+                    else if (status_byte(cmd->SCp.Status) != GOOD)
+                        cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
+                    
+#ifdef AUTOSENSE
+                    if ((cmd->cmnd[0] != REQUEST_SENSE) && 
+                        (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
+                        ASEN_PRINTK("scsi%d: performing request sense\n",
+                                    HOSTNO);
+                        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->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
+
+                        cmd->use_sg = 0;
+                        /* this is initialized from initialize_SCp 
+                        cmd->SCp.buffer = NULL;
+                        cmd->SCp.buffers_residual = 0;
+                        */
+                        cmd->request_buffer = (char *) cmd->sense_buffer;
+                        cmd->request_bufflen = sizeof(cmd->sense_buffer);
+
+                        local_irq_save(flags);
+                        LIST(cmd,hostdata->issue_queue);
+                        NEXT(cmd) = hostdata->issue_queue;
+                        hostdata->issue_queue = (Scsi_Cmnd *) cmd;
+                        local_irq_restore(flags);
+                        QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
+                                  "issue queue\n", H_NO(cmd));
+                   } 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);
+                    /* Enable reselect interrupts */
+                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+                    switch (hostdata->last_message) {
+                    case HEAD_OF_QUEUE_TAG:
+                    case ORDERED_QUEUE_TAG:
+                    case SIMPLE_QUEUE_TAG:
+                        /* The target obviously doesn't support tagged
+                         * queuing, even though it announced this ability in
+                         * its INQUIRY data ?!? (maybe only this LUN?) Ok,
+                         * clear 'tagged_supported' and lock the LUN, since
+                         * the command is treated as untagged further on.
+                         */
+                        cmd->device->tagged_supported = 0;
+                        hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
+                        cmd->tag = TAG_NONE;
+                        TAG_PRINTK("scsi%d: target %d lun %d rejected "
+                                   "QUEUE_TAG message; tagged queuing "
+                                   "disabled\n",
+                                   HOSTNO, cmd->device->id, cmd->device->lun);
+                        break;
+                    }
+                    break;
+                case DISCONNECT:
+                    /* Accept message by clearing ACK */
+                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+                    local_irq_save(flags);
+                    cmd->device->disconnect = 1;
+                    LIST(cmd,hostdata->disconnected_queue);
+                    NEXT(cmd) = hostdata->disconnected_queue;
+                    hostdata->connected = NULL;
+                    hostdata->disconnected_queue = cmd;
+                    local_irq_restore(flags);
+                    QU_PRINTK("scsi%d: command for target %d lun %d was "
+                              "moved from connected to the "
+                              "disconnected_queue\n", HOSTNO, 
+                              cmd->device->id, cmd->device->lun);
+                    /* 
+                     * Restore phase bits to 0 so an interrupted selection, 
+                     * arbitration can resume.
+                     */
+                    NCR5380_write(TARGET_COMMAND_REG, 0);
+
+                    /* Enable reselect interrupts */
+                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+                    /* Wait for bus free to avoid nasty timeouts */
+                    while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+                        barrier();
+#ifdef SUN3_SCSI_VME
+                    dregs->csr |= CSR_DMA_ENABLE;
+#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);
+                    /* Enable reselect interrupts */
+                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+                    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);
+
+                    EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
+
+                    len = 2;
+                    data = extended_msg + 1;
+                    phase = PHASE_MSGIN;
+                    NCR5380_transfer_pio(instance, &phase, &len, &data);
+                    EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
+                               (int)extended_msg[1], (int)extended_msg[2]);
+
+                    if (!len && extended_msg[1] <= 
+                        (sizeof (extended_msg) - 1)) {
+                        /* Accept third byte by clearing ACK */
+                        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+                        len = extended_msg[1] - 1;
+                        data = extended_msg + 3;
+                        phase = PHASE_MSGIN;
+
+                        NCR5380_transfer_pio(instance, &phase, &len, &data);
+                        EXT_PRINTK("scsi%d: message received, residual %d\n",
+                                   HOSTNO, len);
+
+                        switch (extended_msg[2]) {
+                        case EXTENDED_SDTR:
+                        case EXTENDED_WDTR:
+                        case EXTENDED_MODIFY_DATA_POINTER:
+                        case EXTENDED_EXTENDED_IDENTIFY:
+                            tmp = 0;
+                        }
+                    } else if (len) {
+                        printk(KERN_NOTICE "scsi%d: error receiving "
+                               "extended message\n", HOSTNO);
+                        tmp = 0;
+                    } else {
+                        printk(KERN_NOTICE "scsi%d: extended message "
+                               "code %02x length %d is too long\n",
+                               HOSTNO, 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(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
+                        print_msg (extended_msg);
+                        printk("\n");
+                    } else if (tmp != EXTENDED_MESSAGE)
+                        printk(KERN_DEBUG "scsi%d: rejecting unknown "
+                               "message %02x from target %d, lun %d\n",
+                               HOSTNO, tmp, cmd->device->id, cmd->device->lun);
+                    else
+                        printk(KERN_DEBUG "scsi%d: rejecting unknown "
+                               "extended message "
+                               "code %02x, length %d from target %d, lun %d\n",
+                               HOSTNO, extended_msg[1], extended_msg[0],
+                               cmd->device->id, cmd->device->lun);
+   
+
+                    msgout = MESSAGE_REJECT;
+                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
+                        ICR_ASSERT_ATN);
+                    break;
+                } /* switch (tmp) */
+                break;
+            case PHASE_MSGOUT:
+                len = 1;
+                data = &msgout;
+                hostdata->last_message = msgout;
+                NCR5380_transfer_pio(instance, &phase, &len, &data);
+                if (msgout == ABORT) {
+#ifdef SUPPORT_TAGS
+                    cmd_free_tag( cmd );
+#else
+                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+#endif
+                    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);
+                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", HOSTNO);
+                NCR_PRINT(NDEBUG_ANY);
+            } /* switch(phase) */
+        } /* if (tmp * SR_REQ) */ 
+    } /* 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.
+ *
+ */
+
+/* it might eventually prove necessary to do a dma setup on
+   reselection, but it doesn't seem to be needed now -- sam */
+
+static void NCR5380_reselect (struct Scsi_Host *instance)
+{
+    SETUP_HOSTDATA(instance);
+    unsigned char target_mask;
+    unsigned char lun;
+#ifdef SUPPORT_TAGS
+    unsigned char tag;
+#endif
+    unsigned char msg[3];
+    Scsi_Cmnd *tmp = NULL, *prev;
+/*    unsigned long flags; */
+
+    /*
+     * 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);
+
+    RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
+
+    /* 
+     * 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));
+
+#if 1
+    // acknowledge toggle to MSGIN
+    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
+
+    // peek at the byte without really hitting the bus
+    msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
+#endif
+
+    if (!(msg[0] & 0x80)) {
+        printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
+        print_msg(msg);
+        do_abort(instance);
+        return;
+    }
+    lun = (msg[0] & 0x07);
+
+    /* 
+     * 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 = NEXT(tmp) ) {
+        if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
+#ifdef SUPPORT_TAGS
+            && (tag == tmp->tag) 
+#endif
+            ) {
+            if (prev) {
+                REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
+                NEXT(prev) = NEXT(tmp);
+            } else {
+                REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
+                hostdata->disconnected_queue = NEXT(tmp);
+            }
+            NEXT(tmp) = NULL;
+            break;
+        }
+    }
+    
+    if (!tmp) {
+        printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
+#ifdef SUPPORT_TAGS
+                "tag %d "
+#endif
+                "not in disconnected_queue.\n",
+                HOSTNO, target_mask, lun
+#ifdef SUPPORT_TAGS
+                , tag
+#endif
+                );
+        /* 
+         * Since we have an established nexus that we can't do anything
+         * with, we must abort it.  
+         */
+        do_abort(instance);
+        return;
+    }
+#if 1
+    /* engage dma setup for the command we just saw */
+    {
+            void *d;
+            unsigned long count;
+
+            if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
+                    count = tmp->SCp.buffer->length;
+                    d = SGADDR(tmp->SCp.buffer);
+            } else {
+                    count = tmp->SCp.this_residual;
+                    d = tmp->SCp.ptr;
+            }
+#ifdef REAL_DMA
+            /* setup this command for dma if not already */
+            if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
+            {
+                    sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
+                    sun3_dma_setup_done = tmp;
+            }
+#endif
+    }
+#endif
+
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
+    /* Accept message by clearing ACK */
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+#ifdef SUPPORT_TAGS
+    /* If the phase is still MSGIN, the target wants to send some more
+     * messages. In case it supports tagged queuing, this is probably a
+     * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
+     */
+    tag = TAG_NONE;
+    if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
+        /* Accept previous IDENTIFY message by clearing ACK */
+        NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
+        len = 2;
+        data = msg+1;
+        if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
+            msg[1] == SIMPLE_QUEUE_TAG)
+            tag = msg[2];
+        TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
+                   "reselection\n", HOSTNO, target_mask, lun, tag);
+    }
+#endif
+    
+    hostdata->connected = tmp;
+    RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
+               HOSTNO, tmp->target, tmp->lun, tmp->tag);
+}
+
+
+/*
+ * 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().
+ */
+
+static int NCR5380_abort (Scsi_Cmnd *cmd)
+{
+    struct Scsi_Host *instance = cmd->device->host;
+    SETUP_HOSTDATA(instance);
+    Scsi_Cmnd *tmp, **prev;
+    unsigned long flags;
+
+    printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
+    print_Scsi_Cmnd (cmd);
+
+    NCR5380_print_status (instance);
+
+    local_irq_save(flags);
+    
+    ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
+                NCR5380_read(BUS_AND_STATUS_REG),
+                NCR5380_read(STATUS_REG));
+
+#if 1
+/* 
+ * 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) {
+
+        ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
+/*
+ * 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.
+ */ 
+
+        if (do_abort(instance) == 0) {
+          hostdata->aborted = 1;
+          hostdata->connected = NULL;
+          cmd->result = DID_ABORT << 16;
+#ifdef SUPPORT_TAGS
+          cmd_free_tag( cmd );
+#else
+          hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+#endif
+          local_irq_restore(flags);
+          cmd->scsi_done(cmd);
+          return SCSI_ABORT_SUCCESS;
+        } else {
+/*        local_irq_restore(flags); */
+          printk("scsi%d: abort of connected command failed!\n", HOSTNO);
+          return SCSI_ABORT_ERROR;
+        } 
+   }
+#endif
+
+/* 
+ * Case 2 : If the command hasn't been issued yet, we simply remove it 
+ *          from the issue queue.
+ */
+    for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue), 
+        tmp = (Scsi_Cmnd *) hostdata->issue_queue;
+        tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
+        if (cmd == tmp) {
+            REMOVE(5, *prev, tmp, NEXT(tmp));
+            (*prev) = NEXT(tmp);
+            NEXT(tmp) = NULL;
+            tmp->result = DID_ABORT << 16;
+            local_irq_restore(flags);
+            ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
+                        HOSTNO);
+            /* Tagged queuing note: no tag to free here, hasn't been assigned
+             * yet... */
+            tmp->scsi_done(tmp);
+            return SCSI_ABORT_SUCCESS;
+        }
+
+/* 
+ * 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) {
+        local_irq_restore(flags);
+        ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
+        return SCSI_ABORT_SNOOZE;
+    }
+
+/*
+ * 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 = NEXT(tmp)) 
+        if (cmd == tmp) {
+            local_irq_restore(flags);
+            ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
+  
+            if (NCR5380_select (instance, cmd, (int) cmd->tag)) 
+                return SCSI_ABORT_BUSY;
+
+            ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
+
+            do_abort (instance);
+
+            local_irq_save(flags);
+            for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue), 
+                tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
+                tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
+                    if (cmd == tmp) {
+                    REMOVE(5, *prev, tmp, NEXT(tmp));
+                    *prev = NEXT(tmp);
+                    NEXT(tmp) = NULL;
+                    tmp->result = DID_ABORT << 16;
+                    /* We must unlock the tag/LUN immediately here, since the
+                     * target goes to BUS FREE and doesn't send us another
+                     * message (COMMAND_COMPLETE or the like)
+                     */
+#ifdef SUPPORT_TAGS
+                    cmd_free_tag( tmp );
+#else
+                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
+#endif
+                    local_irq_restore(flags);
+                    tmp->scsi_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.
+ */
+
+    local_irq_restore(flags);
+    printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
+           KERN_INFO "        before abortion\n", HOSTNO); 
+
+    return SCSI_ABORT_NOT_RUNNING;
+}
+
+
+/* 
+ * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
+ * 
+ * Purpose : reset the SCSI bus.
+ *
+ * Returns : SCSI_RESET_WAKEUP
+ *
+ */ 
+
+static int NCR5380_bus_reset( Scsi_Cmnd *cmd)
+{
+    SETUP_HOSTDATA(cmd->device->host);
+    int           i;
+    unsigned long flags;
+#if 1
+    Scsi_Cmnd *connected, *disconnected_queue;
+#endif
+
+
+    NCR5380_print_status (cmd->device->host);
+
+    /* get in phase */
+    NCR5380_write( TARGET_COMMAND_REG,
+                   PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
+    /* assert RST */
+    NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
+    udelay (40);
+    /* reset NCR registers */
+    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 );
+    /* ++roman: reset interrupt condition! otherwise no interrupts don't get
+     * through anymore ... */
+    (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
+
+#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
+      /* XXX see below                                            XXX */
+
+    /* MSch: old-style reset: actually abort all command processing here */
+
+    /* After the reset, there are no more connected or disconnected commands
+     * and no busy units; to avoid problems with re-inserting the commands
+     * into the issue_queue (via scsi_done()), the aborted commands are
+     * remembered in local variables first.
+     */
+    local_irq_save(flags);
+    connected = (Scsi_Cmnd *)hostdata->connected;
+    hostdata->connected = NULL;
+    disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
+    hostdata->disconnected_queue = NULL;
+#ifdef SUPPORT_TAGS
+    free_all_tags();
+#endif
+    for( i = 0; i < 8; ++i )
+        hostdata->busy[i] = 0;
+#ifdef REAL_DMA
+    hostdata->dma_len = 0;
+#endif
+    local_irq_restore(flags);
+
+    /* In order to tell the mid-level code which commands were aborted, 
+     * set the command status to DID_RESET and call scsi_done() !!!
+     * This ultimately aborts processing of these commands in the mid-level.
+     */
+
+    if ((cmd = connected)) {
+        ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
+        cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
+        cmd->scsi_done( cmd );
+    }
+
+    for (i = 0; (cmd = disconnected_queue); ++i) {
+        disconnected_queue = NEXT(cmd);
+        NEXT(cmd) = NULL;
+        cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
+        cmd->scsi_done( cmd );
+    }
+    if (i > 0)
+        ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
+
+
+    /* since all commands have been explicitly terminated, we need to tell
+     * the midlevel code that the reset was SUCCESSFUL, and there is no 
+     * need to 'wake up' the commands by a request_sense
+     */
+    return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
+#else /* 1 */
+
+    /* MSch: new-style reset handling: let the mid-level do what it can */
+
+    /* ++guenther: MID-LEVEL IS STILL BROKEN.
+     * Mid-level is supposed to requeue all commands that were active on the
+     * various low-level queues. In fact it does this, but that's not enough
+     * because all these commands are subject to timeout. And if a timeout
+     * happens for any removed command, *_abort() is called but all queues
+     * are now empty. Abort then gives up the falcon lock, which is fatal,
+     * since the mid-level will queue more commands and must have the lock
+     * (it's all happening inside timer interrupt handler!!).
+     * Even worse, abort will return NOT_RUNNING for all those commands not
+     * on any queue, so they won't be retried ...
+     *
+     * Conclusion: either scsi.c disables timeout for all resetted commands
+     * immediately, or we lose!  As of linux-2.0.20 it doesn't.
+     */
+
+    /* After the reset, there are no more connected or disconnected commands
+     * and no busy units; so clear the low-level status here to avoid 
+     * conflicts when the mid-level code tries to wake up the affected 
+     * commands!
+     */
+
+    if (hostdata->issue_queue)
+        ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
+    if (hostdata->connected) 
+        ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
+    if (hostdata->disconnected_queue)
+        ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
+
+    local_irq_save(flags);
+    hostdata->issue_queue = NULL;
+    hostdata->connected = NULL;
+    hostdata->disconnected_queue = NULL;
+#ifdef SUPPORT_TAGS
+    free_all_tags();
+#endif
+    for( i = 0; i < 8; ++i )
+        hostdata->busy[i] = 0;
+#ifdef REAL_DMA
+    hostdata->dma_len = 0;
+#endif
+    local_irq_restore(flags);
+
+    /* we did no complete reset of all commands, so a wakeup is required */
+    return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
+#endif /* 1 */
+}
+
+/* Local Variables: */
+/* tab-width: 8     */
+/* End:             */