Linux-2.6.12-rc2v2.6.12-rc2

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

Let it rip!

1 files changed, 2986 insertions, 0 deletions

diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c
new file mode 100644
index 00000000000..5d1e78ebed8
--- /dev/null
+++ b/drivers/scsi/atari_NCR5380.c
@@ -0,0 +1,2986 @@
+/* 
+ * 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
+
+#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
+
+typedef struct {
+    DECLARE_BITMAP(allocated, MAX_TAGS);
+    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];
+	    bitmap_zero(ta->allocated, MAX_TAGS);
+	    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];
+	    bitmap_zero(ta->allocated, MAX_TAGS);
+	    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(page_address(cmd->SCp.buffer[1].page)+
+		      cmd->SCp.buffer[1].offset) == endaddr; ) {
+	MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
+		   cmd->SCp.buffer[1].address, 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 *)page_address(cmd->SCp.buffer->page)+
+		       cmd->SCp.buffer->offset;
+	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 NDEBUG
+static struct {
+    unsigned char mask;
+    const char * name;} 
+signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, 
+    { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD,  "CD" }, { SR_IO, "IO" }, 
+    { SR_SEL, "SEL" }, {0, NULL}}, 
+basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
+icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
+    {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, 
+    {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, 
+    {0, NULL}},
+mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, 
+    {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, 
+    "MODE PARITY INTR"}, {MR_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(pr_bfr, &start, 0, PAGE_SIZE, HOSTNO, 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.
+ *
+ */
+
+static
+int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
+{
+    SETUP_HOSTDATA(cmd->device->host);
+    Scsi_Cmnd *tmp;
+    int oldto;
+    unsigned long flags;
+    extern int update_timeout(Scsi_Cmnd * SCset, int timeout);
+
+#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 (!IS_A_TT()) {
+	oldto = update_timeout(cmd, 0);
+	falcon_get_lock();
+	update_timeout(cmd, oldto);
+    }
+    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))
+		;
+		/*printk("%p  ", tmp);*/
+	    if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
+#endif
+	    for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, 
+		 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
+
+#if (NDEBUG & NDEBUG_LISTS)
+		if (prev != tmp)
+		    printk("MAIN tmp=%p   target=%d   busy=%d lun=%d\n",
+			   tmp, tmp->device->id, hostdata->busy[tmp->device->id],
+			   tmp->device->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;
+		    falcon_dont_release++;
+		    
+		    /* 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->device->id, tmp->device->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)) {
+			falcon_dont_release--;
+			/* release if target did not response! */
+			falcon_release_lock_if_possible( hostdata );
+			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
+			falcon_dont_release--;
+			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, saved_data = 0, overrun = 0, cnt, toPIO;
+    unsigned char **data, p;
+    volatile int  *count;
+
+    if (!hostdata->connected) {
+	printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
+	       "no connected cmd\n", HOSTNO);
+	return;
+    }
+    
+    if (atari_read_overruns) {
+	p = hostdata->connected->SCp.phase;
+	if (p & SR_IO) {
+	    udelay(10);
+	    if ((((NCR5380_read(BUS_AND_STATUS_REG)) &
+		  (BASR_PHASE_MATCH|BASR_ACK)) ==
+		 (BASR_PHASE_MATCH|BASR_ACK))) {
+		saved_data = NCR5380_read(INPUT_DATA_REG);
+		overrun = 1;
+		DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
+	    }
+	}
+    }
+
+    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));
+
+    (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;
+
+    if (atari_read_overruns) {
+	if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
+	    cnt = toPIO = atari_read_overruns;
+	    if (overrun) {
+		DMA_PRINTK("Got an input overrun, using saved byte\n");
+		*(*data)++ = saved_data;
+		(*count)--;
+		cnt--;
+		toPIO--;
+	    }
+	    DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
+	    NCR5380_transfer_pio(instance, &p, &cnt, data);
+	    *count -= toPIO - cnt;
+	}
+    }
+}
+#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)
+		    printk(KERN_NOTICE "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);
+	    }
+	} /* 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);
+    }
+    
+    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    
+
+    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;
+    register unsigned char *d = *data;
+    unsigned char tmp;
+    unsigned long flags;
+
+    if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
+        *phase = tmp;
+        return -1;
+    }
+
+    if (atari_read_overruns && (p & SR_IO)) {
+	c -= atari_read_overruns;
+    }
+
+    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", d);
+
+    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+
+#ifdef REAL_DMA
+    NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
+#endif /* def REAL_DMA  */
+
+    if (IS_A_TT()) {
+	/* On the Medusa, it is a must to initialize the DMA before
+	 * starting the NCR. This is also the cleaner way for the TT.
+	 */
+	local_irq_save(flags);
+	hostdata->dma_len = (p & SR_IO) ?
+	    NCR5380_dma_read_setup(instance, d, c) : 
+	    NCR5380_dma_write_setup(instance, d, c);
+	local_irq_restore(flags);
+    }
+    
+    if (p & SR_IO)
+	NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
+    else {
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
+	NCR5380_write(START_DMA_SEND_REG, 0);
+    }
+
+    if (!IS_A_TT()) {
+	/* On the Falcon, the DMA setup must be done after the last */
+	/* NCR access, else the DMA setup gets trashed!
+	 */
+	local_irq_save(flags);
+	hostdata->dma_len = (p & SR_IO) ?
+	    NCR5380_dma_read_setup(instance, d, c) : 
+	    NCR5380_dma_write_setup(instance, d, c);
+	local_irq_restore(flags);
+    }
+    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;
+
+    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 (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 = page_address(cmd->SCp.buffer->page)+
+				   cmd->SCp.buffer->offset;
+		    /* ++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 &&
+		    (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
+		    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);
+		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);
+		    /* ++guenther: possible race with Falcon locking */
+		    falcon_dont_release++;
+		    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();
+
+		    falcon_dont_release--;
+		    /* ++roman: For Falcon SCSI, release the lock on the
+		     * ST-DMA here if no other commands are waiting on the
+		     * disconnected queue.
+		     */
+		    falcon_release_lock_if_possible( hostdata );
+		    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();
+		    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);
+		    falcon_release_lock_if_possible( hostdata );
+		    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.
+ *
+ */
+
+
+static void NCR5380_reselect (struct Scsi_Host *instance)
+{
+    SETUP_HOSTDATA(instance);
+    unsigned char target_mask;
+    unsigned char lun, phase;
+    int len;
+#ifdef SUPPORT_TAGS
+    unsigned char tag;
+#endif
+    unsigned char msg[3];
+    unsigned char *data;
+    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));
+
+    len = 1;
+    data = msg;
+    phase = PHASE_MSGIN;
+    NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+    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);
+
+#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
+    
+    /* 
+     * 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
+	    ) {
+	    /* ++guenther: prevent race with falcon_release_lock */
+	    falcon_dont_release++;
+	    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;
+    }
+
+    /* Accept message by clearing ACK */
+    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+    hostdata->connected = tmp;
+    RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
+	       HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
+    falcon_dont_release--;
+}
+
+
+/*
+ * 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);
+    
+    if (!IS_A_TT() && !falcon_got_lock)
+	printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
+	       HOSTNO);
+
+    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);
+	  falcon_release_lock_if_possible( hostdata );
+	  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);
+	    falcon_release_lock_if_possible( hostdata );
+	    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);
+		    falcon_release_lock_if_possible( hostdata );
+		    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); 
+
+/* Maybe it is sufficient just to release the ST-DMA lock... (if
+ * possible at all) At least, we should check if the lock could be
+ * released after the abort, in case it is kept due to some bug.
+ */
+    falcon_release_lock_if_possible( hostdata );
+
+    return SCSI_ABORT_NOT_RUNNING;
+}
+
+
+/* 
+ * Function : int NCR5380_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
+
+    if (!IS_A_TT() && !falcon_got_lock)
+	printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
+	       H_NO(cmd) );
+
+    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);
+
+/* The Falcon lock should be released after a reset...
+ */
+/* ++guenther: moved to atari_scsi_reset(), to prevent a race between
+ * unlocking and enabling dma interrupt.
+ */
+/*    falcon_release_lock_if_possible( hostdata );*/
+
+    /* 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:             */