2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * Note that these routines also work with NR53c400 family chips.
8 * Copyright 1993, Drew Eckhardt
10 * (Unix and Linux consulting and custom programming)
14 * For more information, please consult
17 * SCSI Protocol Controller
20 * NCR Microelectronics
21 * 1635 Aeroplaza Drive
22 * Colorado Springs, CO 80916
28 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
31 * - Some of the debug statements were incorrect (undefined variables and the
32 * like). I fixed that.
34 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
35 * possible DMA transfer size should also happen for REAL_DMA. I added this
36 * in the #if statement.
38 * - When using real DMA, information_transfer() should return in a DATAOUT
39 * phase after starting the DMA. It has nothing more to do.
41 * - The interrupt service routine should run main after end of DMA, too (not
42 * only after RESELECTION interrupts). Additionally, it should _not_ test
43 * for more interrupts after running main, since a DMA process may have
44 * been started and interrupts are turned on now. The new int could happen
45 * inside the execution of NCR5380_intr(), leading to recursive
48 * - I've added a function merge_contiguous_buffers() that tries to
49 * merge scatter-gather buffers that are located at contiguous
50 * physical addresses and can be processed with the same DMA setup.
51 * Since most scatter-gather operations work on a page (4K) of
52 * 4 buffers (1K), in more than 90% of all cases three interrupts and
53 * DMA setup actions are saved.
55 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
56 * and USLEEP, because these were messing up readability and will never be
57 * needed for Atari SCSI.
59 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
60 * stuff), and 'main' is executed in a bottom half if awoken by an
63 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
64 * constructs. In my eyes, this made the source rather unreadable, so I
65 * finally replaced that by the *_PRINTK() macros.
69 /* Adapted for the sun3 by Sam Creasey. */
71 #if (NDEBUG & NDEBUG_LISTS)
74 printk("LINE:%d Adding %p to %p\n", \
75 __LINE__, (void*)(x), (void*)(y)); \
79 #define REMOVE(w, x, y, z) \
81 printk("LINE:%d Removing: %p->%p %p->%p \n", \
82 __LINE__, (void*)(w), (void*)(x), \
83 (void*)(y), (void*)(z)); \
89 #define REMOVE(w,x,y,z)
95 * This is a generic 5380 driver. To use it on a different platform,
96 * one simply writes appropriate system specific macros (ie, data
97 * transfer - some PC's will use the I/O bus, 68K's must use
98 * memory mapped) and drops this file in their 'C' wrapper.
100 * As far as command queueing, two queues are maintained for
101 * each 5380 in the system - commands that haven't been issued yet,
102 * and commands that are currently executing. This means that an
103 * unlimited number of commands may be queued, letting
104 * more commands propagate from the higher driver levels giving higher
105 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
106 * allowing multiple commands to propagate all the way to a SCSI-II device
107 * while a command is already executing.
110 * Issues specific to the NCR5380 :
112 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
113 * piece of hardware that requires you to sit in a loop polling for
114 * the REQ signal as long as you are connected. Some devices are
115 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
116 * while doing long seek operations. [...] These
117 * broken devices are the exception rather than the rule and I'd rather
118 * spend my time optimizing for the normal case.
122 * At the heart of the design is a coroutine, NCR5380_main,
123 * which is started from a workqueue for each NCR5380 host in the
124 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
125 * removing the commands from the issue queue and calling
126 * NCR5380_select() if a nexus is not established.
128 * Once a nexus is established, the NCR5380_information_transfer()
129 * phase goes through the various phases as instructed by the target.
130 * if the target goes into MSG IN and sends a DISCONNECT message,
131 * the command structure is placed into the per instance disconnected
132 * queue, and NCR5380_main tries to find more work. If the target is
133 * idle for too long, the system will try to sleep.
135 * If a command has disconnected, eventually an interrupt will trigger,
136 * calling NCR5380_intr() which will in turn call NCR5380_reselect
137 * to reestablish a nexus. This will run main if necessary.
139 * On command termination, the done function will be called as
142 * SCSI pointers are maintained in the SCp field of SCSI command
143 * structures, being initialized after the command is connected
144 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
145 * Note that in violation of the standard, an implicit SAVE POINTERS operation
146 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
151 * This file a skeleton Linux SCSI driver for the NCR 5380 series
152 * of chips. To use it, you write an architecture specific functions
153 * and macros and include this file in your driver.
155 * These macros control options :
156 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
157 * for commands that return with a CHECK CONDITION status.
159 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
162 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
164 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
166 * These macros MUST be defined :
168 * NCR5380_read(register) - read from the specified register
170 * NCR5380_write(register, value) - write to the specific register
172 * NCR5380_implementation_fields - additional fields needed for this
173 * specific implementation of the NCR5380
175 * Either real DMA *or* pseudo DMA may be implemented
177 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
178 * Note that the DMA setup functions should return the number of bytes
179 * that they were able to program the controller for.
181 * Also note that generic i386/PC versions of these macros are
182 * available as NCR5380_i386_dma_write_setup,
183 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
185 * NCR5380_dma_write_setup(instance, src, count) - initialize
186 * NCR5380_dma_read_setup(instance, dst, count) - initialize
187 * NCR5380_dma_residual(instance); - residual count
190 * NCR5380_pwrite(instance, src, count)
191 * NCR5380_pread(instance, dst, count);
193 * The generic driver is initialized by calling NCR5380_init(instance),
194 * after setting the appropriate host specific fields and ID. If the
195 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
196 * possible) function may be used.
199 /* Macros ease life... :-) */
200 #define SETUP_HOSTDATA(in) \
201 struct NCR5380_hostdata *hostdata = \
202 (struct NCR5380_hostdata *)(in)->hostdata
203 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
205 #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
206 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
207 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble)
209 #define HOSTNO instance->host_no
210 #define H_NO(cmd) (cmd)->device->host->host_no
212 static int do_abort(struct Scsi_Host *);
213 static void do_reset(struct Scsi_Host *);
218 * Functions for handling tagged queuing
219 * =====================================
221 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
223 * Using consecutive numbers for the tags is no good idea in my eyes. There
224 * could be wrong re-usings if the counter (8 bit!) wraps and some early
225 * command has been preempted for a long time. My solution: a bitfield for
226 * remembering used tags.
228 * There's also the problem that each target has a certain queue size, but we
229 * cannot know it in advance :-( We just see a QUEUE_FULL status being
230 * returned. So, in this case, the driver internal queue size assumption is
231 * reduced to the number of active tags if QUEUE_FULL is returned by the
234 * We're also not allowed running tagged commands as long as an untagged
235 * command is active. And REQUEST SENSE commands after a contingent allegiance
236 * condition _must_ be untagged. To keep track whether an untagged command has
237 * been issued, the host->busy array is still employed, as it is without
238 * support for tagged queuing.
240 * One could suspect that there are possible race conditions between
241 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
242 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
243 * which already guaranteed to be running at most once. It is also the only
244 * place where tags/LUNs are allocated. So no other allocation can slip
245 * between that pair, there could only happen a reselection, which can free a
246 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
247 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
250 static void __init init_tags(struct NCR5380_hostdata *hostdata)
253 struct tag_alloc *ta;
255 if (!(hostdata->flags & FLAG_TAGGED_QUEUING))
258 for (target = 0; target < 8; ++target) {
259 for (lun = 0; lun < 8; ++lun) {
260 ta = &hostdata->TagAlloc[target][lun];
261 bitmap_zero(ta->allocated, MAX_TAGS);
262 ta->nr_allocated = 0;
263 /* At the beginning, assume the maximum queue size we could
264 * support (MAX_TAGS). This value will be decreased if the target
265 * returns QUEUE_FULL status.
267 ta->queue_size = MAX_TAGS;
273 /* Check if we can issue a command to this LUN: First see if the LUN is marked
274 * busy by an untagged command. If the command should use tagged queuing, also
275 * check that there is a free tag and the target's queue won't overflow. This
276 * function should be called with interrupts disabled to avoid race
280 static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
282 u8 lun = cmd->device->lun;
283 SETUP_HOSTDATA(cmd->device->host);
285 if (hostdata->busy[cmd->device->id] & (1 << lun))
287 if (!should_be_tagged ||
288 !(hostdata->flags & FLAG_TAGGED_QUEUING) ||
289 !cmd->device->tagged_supported)
291 if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >=
292 hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) {
293 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n",
294 H_NO(cmd), cmd->device->id, lun);
301 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
302 * must be called before!), or reserve the LUN in 'busy' if the command is
306 static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
308 u8 lun = cmd->device->lun;
309 SETUP_HOSTDATA(cmd->device->host);
311 /* If we or the target don't support tagged queuing, allocate the LUN for
312 * an untagged command.
314 if (!should_be_tagged ||
315 !(hostdata->flags & FLAG_TAGGED_QUEUING) ||
316 !cmd->device->tagged_supported) {
318 hostdata->busy[cmd->device->id] |= (1 << lun);
319 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged "
320 "command\n", H_NO(cmd), cmd->device->id, lun);
322 struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun];
324 cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
325 set_bit(cmd->tag, ta->allocated);
327 dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d "
328 "(now %d tags in use)\n",
329 H_NO(cmd), cmd->tag, cmd->device->id,
330 lun, ta->nr_allocated);
335 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
339 static void cmd_free_tag(struct scsi_cmnd *cmd)
341 u8 lun = cmd->device->lun;
342 SETUP_HOSTDATA(cmd->device->host);
344 if (cmd->tag == TAG_NONE) {
345 hostdata->busy[cmd->device->id] &= ~(1 << lun);
346 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n",
347 H_NO(cmd), cmd->device->id, lun);
348 } else if (cmd->tag >= MAX_TAGS) {
349 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
350 H_NO(cmd), cmd->tag);
352 struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun];
353 clear_bit(cmd->tag, ta->allocated);
355 dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n",
356 H_NO(cmd), cmd->tag, cmd->device->id, lun);
361 static void free_all_tags(struct NCR5380_hostdata *hostdata)
364 struct tag_alloc *ta;
366 if (!(hostdata->flags & FLAG_TAGGED_QUEUING))
369 for (target = 0; target < 8; ++target) {
370 for (lun = 0; lun < 8; ++lun) {
371 ta = &hostdata->TagAlloc[target][lun];
372 bitmap_zero(ta->allocated, MAX_TAGS);
373 ta->nr_allocated = 0;
378 #endif /* SUPPORT_TAGS */
382 * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd )
384 * Purpose: Try to merge several scatter-gather requests into one DMA
385 * transfer. This is possible if the scatter buffers lie on
386 * physical contiguous addresses.
388 * Parameters: struct scsi_cmnd *cmd
389 * The command to work on. The first scatter buffer's data are
390 * assumed to be already transferred into ptr/this_residual.
393 static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
395 #if !defined(CONFIG_SUN3)
396 unsigned long endaddr;
397 #if (NDEBUG & NDEBUG_MERGING)
398 unsigned long oldlen = cmd->SCp.this_residual;
402 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
403 cmd->SCp.buffers_residual &&
404 virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) {
405 dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n",
406 page_address(sg_page(&cmd->SCp.buffer[1])), endaddr);
407 #if (NDEBUG & NDEBUG_MERGING)
411 --cmd->SCp.buffers_residual;
412 cmd->SCp.this_residual += cmd->SCp.buffer->length;
413 endaddr += cmd->SCp.buffer->length;
415 #if (NDEBUG & NDEBUG_MERGING)
416 if (oldlen != cmd->SCp.this_residual)
417 dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n",
418 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
420 #endif /* !defined(CONFIG_SUN3) */
424 * initialize_SCp - init the scsi pointer field
425 * @cmd: command block to set up
427 * Set up the internal fields in the SCSI command.
430 static inline void initialize_SCp(struct scsi_cmnd *cmd)
433 * Initialize the Scsi Pointer field so that all of the commands in the
434 * various queues are valid.
437 if (scsi_bufflen(cmd)) {
438 cmd->SCp.buffer = scsi_sglist(cmd);
439 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
440 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
441 cmd->SCp.this_residual = cmd->SCp.buffer->length;
442 /* ++roman: Try to merge some scatter-buffers if they are at
443 * contiguous physical addresses.
445 merge_contiguous_buffers(cmd);
447 cmd->SCp.buffer = NULL;
448 cmd->SCp.buffers_residual = 0;
450 cmd->SCp.this_residual = 0;
455 * NCR5380_poll_politely2 - wait for two chip register values
456 * @instance: controller to poll
457 * @reg1: 5380 register to poll
458 * @bit1: Bitmask to check
459 * @val1: Expected value
460 * @reg2: Second 5380 register to poll
461 * @bit2: Second bitmask to check
462 * @val2: Second expected value
463 * @wait: Time-out in jiffies
465 * Polls the chip in a reasonably efficient manner waiting for an
466 * event to occur. After a short quick poll we begin to yield the CPU
467 * (if possible). In irq contexts the time-out is arbitrarily limited.
468 * Callers may hold locks as long as they are held in irq mode.
470 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT.
473 static int NCR5380_poll_politely2(struct Scsi_Host *instance,
474 int reg1, int bit1, int val1,
475 int reg2, int bit2, int val2, int wait)
477 struct NCR5380_hostdata *hostdata = shost_priv(instance);
478 unsigned long deadline = jiffies + wait;
481 /* Busy-wait for up to 10 ms */
482 n = min(10000U, jiffies_to_usecs(wait));
483 n *= hostdata->accesses_per_ms;
486 if ((NCR5380_read(reg1) & bit1) == val1)
488 if ((NCR5380_read(reg2) & bit2) == val2)
493 if (irqs_disabled() || in_interrupt())
496 /* Repeatedly sleep for 1 ms until deadline */
497 while (time_is_after_jiffies(deadline)) {
498 schedule_timeout_uninterruptible(1);
499 if ((NCR5380_read(reg1) & bit1) == val1)
501 if ((NCR5380_read(reg2) & bit2) == val2)
508 static inline int NCR5380_poll_politely(struct Scsi_Host *instance,
509 int reg, int bit, int val, int wait)
511 return NCR5380_poll_politely2(instance, reg, bit, val,
512 reg, bit, val, wait);
520 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
521 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
522 { SR_SEL, "SEL" }, {0, NULL}
524 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
526 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
527 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
528 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
531 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
532 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
533 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
534 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
535 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
540 * NCR5380_print - print scsi bus signals
541 * @instance: adapter state to dump
543 * Print the SCSI bus signals for debugging purposes
546 static void NCR5380_print(struct Scsi_Host *instance)
548 unsigned char status, data, basr, mr, icr, i;
551 local_irq_save(flags);
552 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
553 status = NCR5380_read(STATUS_REG);
554 mr = NCR5380_read(MODE_REG);
555 icr = NCR5380_read(INITIATOR_COMMAND_REG);
556 basr = NCR5380_read(BUS_AND_STATUS_REG);
557 local_irq_restore(flags);
558 printk("STATUS_REG: %02x ", status);
559 for (i = 0; signals[i].mask; ++i)
560 if (status & signals[i].mask)
561 printk(",%s", signals[i].name);
562 printk("\nBASR: %02x ", basr);
563 for (i = 0; basrs[i].mask; ++i)
564 if (basr & basrs[i].mask)
565 printk(",%s", basrs[i].name);
566 printk("\nICR: %02x ", icr);
567 for (i = 0; icrs[i].mask; ++i)
568 if (icr & icrs[i].mask)
569 printk(",%s", icrs[i].name);
570 printk("\nMODE: %02x ", mr);
571 for (i = 0; mrs[i].mask; ++i)
572 if (mr & mrs[i].mask)
573 printk(",%s", mrs[i].name);
581 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
582 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
583 {PHASE_UNKNOWN, "UNKNOWN"}
587 * NCR5380_print_phase - show SCSI phase
588 * @instance: adapter to dump
590 * Print the current SCSI phase for debugging purposes
595 static void NCR5380_print_phase(struct Scsi_Host *instance)
597 unsigned char status;
600 status = NCR5380_read(STATUS_REG);
601 if (!(status & SR_REQ))
602 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
604 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
605 (phases[i].value != (status & PHASE_MASK)); ++i)
607 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
614 * NCR58380_info - report driver and host information
615 * @instance: relevant scsi host instance
617 * For use as the host template info() handler.
622 static const char *NCR5380_info(struct Scsi_Host *instance)
624 struct NCR5380_hostdata *hostdata = shost_priv(instance);
626 return hostdata->info;
629 static void prepare_info(struct Scsi_Host *instance)
631 struct NCR5380_hostdata *hostdata = shost_priv(instance);
633 snprintf(hostdata->info, sizeof(hostdata->info),
634 "%s, io_port 0x%lx, n_io_port %d, "
635 "base 0x%lx, irq %d, "
636 "can_queue %d, cmd_per_lun %d, "
637 "sg_tablesize %d, this_id %d, "
640 instance->hostt->name, instance->io_port, instance->n_io_port,
641 instance->base, instance->irq,
642 instance->can_queue, instance->cmd_per_lun,
643 instance->sg_tablesize, instance->this_id,
644 hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "",
645 hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
662 * NCR5380_print_status - dump controller info
663 * @instance: controller to dump
665 * Print commands in the various queues, called from NCR5380_abort
669 static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd)
672 unsigned char *command;
673 printk("scsi%d: destination target %d, lun %llu\n",
674 H_NO(cmd), cmd->device->id, cmd->device->lun);
675 printk(KERN_CONT " command = ");
677 printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]);
678 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
679 printk(KERN_CONT " %02x", command[i]);
683 static void __maybe_unused NCR5380_print_status(struct Scsi_Host *instance)
685 struct NCR5380_hostdata *hostdata;
686 struct scsi_cmnd *ptr;
689 NCR5380_dprint(NDEBUG_ANY, instance);
690 NCR5380_dprint_phase(NDEBUG_ANY, instance);
692 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
694 local_irq_save(flags);
695 if (!hostdata->connected)
696 printk("scsi%d: no currently connected command\n", HOSTNO);
698 lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected);
699 printk("scsi%d: issue_queue\n", HOSTNO);
700 for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
701 lprint_Scsi_Cmnd(ptr);
703 printk("scsi%d: disconnected_queue\n", HOSTNO);
704 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
706 lprint_Scsi_Cmnd(ptr);
708 local_irq_restore(flags);
712 static void show_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m)
715 unsigned char *command;
716 seq_printf(m, "scsi%d: destination target %d, lun %llu\n",
717 H_NO(cmd), cmd->device->id, cmd->device->lun);
718 seq_puts(m, " command = ");
720 seq_printf(m, "%2d (0x%02x)", command[0], command[0]);
721 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
722 seq_printf(m, " %02x", command[i]);
726 static int __maybe_unused NCR5380_show_info(struct seq_file *m,
727 struct Scsi_Host *instance)
729 struct NCR5380_hostdata *hostdata;
730 struct scsi_cmnd *ptr;
733 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
735 local_irq_save(flags);
736 if (!hostdata->connected)
737 seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);
739 show_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m);
740 seq_printf(m, "scsi%d: issue_queue\n", HOSTNO);
741 for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
742 show_Scsi_Cmnd(ptr, m);
744 seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO);
745 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
747 show_Scsi_Cmnd(ptr, m);
749 local_irq_restore(flags);
754 * NCR5380_init - initialise an NCR5380
755 * @instance: adapter to configure
756 * @flags: control flags
758 * Initializes *instance and corresponding 5380 chip,
759 * with flags OR'd into the initial flags value.
761 * Notes : I assume that the host, hostno, and id bits have been
762 * set correctly. I don't care about the irq and other fields.
764 * Returns 0 for success
767 static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
770 SETUP_HOSTDATA(instance);
771 unsigned long deadline;
773 hostdata->host = instance;
774 hostdata->id_mask = 1 << instance->this_id;
775 hostdata->id_higher_mask = 0;
776 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
777 if (i > hostdata->id_mask)
778 hostdata->id_higher_mask |= i;
779 for (i = 0; i < 8; ++i)
780 hostdata->busy[i] = 0;
784 #if defined (REAL_DMA)
785 hostdata->dma_len = 0;
787 hostdata->connected = NULL;
788 hostdata->issue_queue = NULL;
789 hostdata->disconnected_queue = NULL;
790 hostdata->flags = flags;
792 INIT_WORK(&hostdata->main_task, NCR5380_main);
793 hostdata->work_q = alloc_workqueue("ncr5380_%d",
794 WQ_UNBOUND | WQ_MEM_RECLAIM,
795 1, instance->host_no);
796 if (!hostdata->work_q)
799 prepare_info(instance);
801 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
802 NCR5380_write(MODE_REG, MR_BASE);
803 NCR5380_write(TARGET_COMMAND_REG, 0);
804 NCR5380_write(SELECT_ENABLE_REG, 0);
806 /* Calibrate register polling loop */
808 deadline = jiffies + 1;
811 } while (time_is_after_jiffies(deadline));
812 deadline += msecs_to_jiffies(256);
814 NCR5380_read(STATUS_REG);
817 } while (time_is_after_jiffies(deadline));
818 hostdata->accesses_per_ms = i / 256;
824 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
825 * @instance: adapter to check
827 * If the system crashed, it may have crashed with a connected target and
828 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
829 * currently established nexus, which we know nothing about. Failing that
832 * Note that a bus reset will cause the chip to assert IRQ.
834 * Returns 0 if successful, otherwise -ENXIO.
837 static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
839 struct NCR5380_hostdata *hostdata = shost_priv(instance);
842 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
847 shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n");
848 NCR5380_poll_politely(instance,
849 STATUS_REG, SR_BSY, 0, 5 * HZ);
852 shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n");
856 shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
858 /* Wait after a reset; the SCSI standard calls for
859 * 250ms, we wait 500ms to be on the safe side.
860 * But some Toshiba CD-ROMs need ten times that.
862 if (hostdata->flags & FLAG_TOSHIBA_DELAY)
868 shost_printk(KERN_ERR, instance, "bus locked solid\n");
876 * NCR5380_exit - remove an NCR5380
877 * @instance: adapter to remove
879 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
882 static void NCR5380_exit(struct Scsi_Host *instance)
884 struct NCR5380_hostdata *hostdata = shost_priv(instance);
886 cancel_work_sync(&hostdata->main_task);
887 destroy_workqueue(hostdata->work_q);
891 * NCR5380_queue_command - queue a command
892 * @instance: the relevant SCSI adapter
895 * cmd is added to the per-instance issue queue, with minor
896 * twiddling done to the host specific fields of cmd. If the
897 * main coroutine is not running, it is restarted.
900 static int NCR5380_queue_command(struct Scsi_Host *instance,
901 struct scsi_cmnd *cmd)
903 struct NCR5380_hostdata *hostdata = shost_priv(instance);
904 struct scsi_cmnd *tmp;
907 #if (NDEBUG & NDEBUG_NO_WRITE)
908 switch (cmd->cmnd[0]) {
911 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
913 cmd->result = (DID_ERROR << 16);
917 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
920 * We use the host_scribble field as a pointer to the next command
928 * Insert the cmd into the issue queue. Note that REQUEST SENSE
929 * commands are added to the head of the queue since any command will
930 * clear the contingent allegiance condition that exists and the
931 * sense data is only guaranteed to be valid while the condition exists.
934 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
935 * Otherwise a running NCR5380_main may steal the lock.
936 * Lock before actually inserting due to fairness reasons explained in
937 * atari_scsi.c. If we insert first, then it's impossible for this driver
938 * to release the lock.
939 * Stop timer for this command while waiting for the lock, or timeouts
940 * may happen (and they really do), and it's no good if the command doesn't
941 * appear in any of the queues.
942 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
943 * because also a timer int can trigger an abort or reset, which would
944 * alter queues and touch the lock.
946 if (!NCR5380_acquire_dma_irq(instance))
947 return SCSI_MLQUEUE_HOST_BUSY;
949 local_irq_save(flags);
952 * Insert the cmd into the issue queue. Note that REQUEST SENSE
953 * commands are added to the head of the queue since any command will
954 * clear the contingent allegiance condition that exists and the
955 * sense data is only guaranteed to be valid while the condition exists.
958 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
959 LIST(cmd, hostdata->issue_queue);
960 SET_NEXT(cmd, hostdata->issue_queue);
961 hostdata->issue_queue = cmd;
963 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
964 NEXT(tmp); tmp = NEXT(tmp))
969 local_irq_restore(flags);
971 dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd),
972 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
974 /* Kick off command processing */
975 queue_work(hostdata->work_q, &hostdata->main_task);
979 static inline void maybe_release_dma_irq(struct Scsi_Host *instance)
981 struct NCR5380_hostdata *hostdata = shost_priv(instance);
983 /* Caller does the locking needed to set & test these data atomically */
984 if (!hostdata->disconnected_queue &&
985 !hostdata->issue_queue &&
986 !hostdata->connected &&
987 !hostdata->retain_dma_intr)
988 NCR5380_release_dma_irq(instance);
992 * NCR5380_main - NCR state machines
994 * NCR5380_main is a coroutine that runs as long as more work can
995 * be done on the NCR5380 host adapters in a system. Both
996 * NCR5380_queue_command() and NCR5380_intr() will try to start it
997 * in case it is not running.
999 * Locks: called as its own thread with no locks held.
1002 static void NCR5380_main(struct work_struct *work)
1004 struct NCR5380_hostdata *hostdata =
1005 container_of(work, struct NCR5380_hostdata, main_task);
1006 struct Scsi_Host *instance = hostdata->host;
1007 struct scsi_cmnd *tmp, *prev;
1009 unsigned long flags;
1012 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1013 * because also a timer int can trigger an abort or reset, which can
1014 * alter queues and touch the Falcon lock.
1017 local_save_flags(flags);
1019 local_irq_disable(); /* Freeze request queues */
1022 if (!hostdata->connected) {
1023 dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO);
1025 * Search through the issue_queue for a command destined
1026 * for a target that's not busy.
1028 #if (NDEBUG & NDEBUG_LISTS)
1029 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
1030 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1032 /*printk("%p ", tmp);*/
1033 if ((tmp == prev) && tmp)
1035 /* else printk("\n"); */
1037 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
1038 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
1039 u8 lun = tmp->device->lun;
1041 dprintk(NDEBUG_LISTS,
1042 "MAIN tmp=%p target=%d busy=%d lun=%d\n",
1043 tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)],
1045 /* When we find one, remove it from the issue queue. */
1046 /* ++guenther: possible race with Falcon locking */
1049 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1051 !(hostdata->busy[tmp->device->id] & (1 << lun))
1054 /* ++guenther: just to be sure, this must be atomic */
1055 local_irq_disable();
1057 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1058 SET_NEXT(prev, NEXT(tmp));
1060 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1061 hostdata->issue_queue = NEXT(tmp);
1063 SET_NEXT(tmp, NULL);
1064 hostdata->retain_dma_intr++;
1066 /* reenable interrupts after finding one */
1067 local_irq_restore(flags);
1070 * Attempt to establish an I_T_L nexus here.
1071 * On success, instance->hostdata->connected is set.
1072 * On failure, we must add the command back to the
1073 * issue queue so we can keep trying.
1075 dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d "
1076 "lun %d removed from issue_queue\n",
1077 HOSTNO, tmp->device->id, lun);
1079 * REQUEST SENSE commands are issued without tagged
1080 * queueing, even on SCSI-II devices because the
1081 * contingent allegiance condition exists for the
1084 /* ++roman: ...and the standard also requires that
1085 * REQUEST SENSE command are untagged.
1089 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1091 if (!NCR5380_select(instance, tmp)) {
1092 /* OK or bad target */
1093 local_irq_disable();
1094 hostdata->retain_dma_intr--;
1095 maybe_release_dma_irq(instance);
1096 local_irq_restore(flags);
1099 local_irq_disable();
1100 LIST(tmp, hostdata->issue_queue);
1101 SET_NEXT(tmp, hostdata->issue_queue);
1102 hostdata->issue_queue = tmp;
1106 hostdata->retain_dma_intr--;
1107 local_irq_restore(flags);
1109 dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, "
1110 "returned to issue_queue\n", HOSTNO);
1112 if (hostdata->connected)
1114 } /* if target/lun/target queue is not busy */
1115 } /* for issue_queue */
1116 } /* if (!hostdata->connected) */
1118 if (hostdata->connected
1120 && !hostdata->dma_len
1123 local_irq_restore(flags);
1124 dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n",
1126 NCR5380_information_transfer(instance);
1127 dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO);
1131 local_irq_restore(flags);
1137 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1139 * Purpose : Called by interrupt handler when DMA finishes or a phase
1140 * mismatch occurs (which would finish the DMA transfer).
1142 * Inputs : instance - this instance of the NCR5380.
1146 static void NCR5380_dma_complete(struct Scsi_Host *instance)
1148 SETUP_HOSTDATA(instance);
1150 unsigned char **data;
1151 volatile int *count;
1152 int saved_data = 0, overrun = 0;
1155 if (hostdata->read_overruns) {
1156 p = hostdata->connected->SCp.phase;
1159 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1160 (BASR_PHASE_MATCH|BASR_ACK)) ==
1161 (BASR_PHASE_MATCH|BASR_ACK)) {
1162 saved_data = NCR5380_read(INPUT_DATA_REG);
1164 dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO);
1169 #if defined(CONFIG_SUN3)
1170 if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1171 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
1176 /* make sure we're not stuck in a data phase */
1177 if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) ==
1178 (BASR_PHASE_MATCH | BASR_ACK)) {
1179 pr_err("scsi%d: BASR %02x\n", instance->host_no,
1180 NCR5380_read(BUS_AND_STATUS_REG));
1181 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
1187 NCR5380_write(MODE_REG, MR_BASE);
1188 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1189 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1191 transferred = hostdata->dma_len - NCR5380_dma_residual(instance);
1192 hostdata->dma_len = 0;
1194 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1195 count = &hostdata->connected->SCp.this_residual;
1196 *data += transferred;
1197 *count -= transferred;
1199 if (hostdata->read_overruns) {
1202 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1203 cnt = toPIO = hostdata->read_overruns;
1205 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
1206 *(*data)++ = saved_data;
1211 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1212 NCR5380_transfer_pio(instance, &p, &cnt, data);
1213 *count -= toPIO - cnt;
1217 #endif /* REAL_DMA */
1221 * NCR5380_intr - generic NCR5380 irq handler
1222 * @irq: interrupt number
1223 * @dev_id: device info
1225 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1226 * from the disconnected queue, and restarting NCR5380_main()
1229 * The chip can assert IRQ in any of six different conditions. The IRQ flag
1230 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR).
1231 * Three of these six conditions are latched in the Bus and Status Register:
1232 * - End of DMA (cleared by ending DMA Mode)
1233 * - Parity error (cleared by reading RPIR)
1234 * - Loss of BSY (cleared by reading RPIR)
1235 * Two conditions have flag bits that are not latched:
1236 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode)
1237 * - Bus reset (non-maskable)
1238 * The remaining condition has no flag bit at all:
1239 * - Selection/reselection
1241 * Hence, establishing the cause(s) of any interrupt is partly guesswork.
1242 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor
1243 * claimed that "the design of the [DP8490] interrupt logic ensures
1244 * interrupts will not be lost (they can be on the DP5380)."
1245 * The L5380/53C80 datasheet from LOGIC Devices has more details.
1247 * Checking for bus reset by reading RST is futile because of interrupt
1248 * latency, but a bus reset will reset chip logic. Checking for parity error
1249 * is unnecessary because that interrupt is never enabled. A Loss of BSY
1250 * condition will clear DMA Mode. We can tell when this occurs because the
1251 * the Busy Monitor interrupt is enabled together with DMA Mode.
1254 static irqreturn_t NCR5380_intr(int irq, void *dev_id)
1256 struct Scsi_Host *instance = dev_id;
1257 struct NCR5380_hostdata *hostdata = shost_priv(instance);
1261 basr = NCR5380_read(BUS_AND_STATUS_REG);
1262 if (basr & BASR_IRQ) {
1263 unsigned char mr = NCR5380_read(MODE_REG);
1264 unsigned char sr = NCR5380_read(STATUS_REG);
1266 dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n",
1267 HOSTNO, irq, basr, sr, mr);
1269 #if defined(REAL_DMA)
1270 if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) {
1271 /* Probably End of DMA, Phase Mismatch or Loss of BSY.
1272 * We ack IRQ after clearing Mode Register. Workarounds
1273 * for End of DMA errata need to happen in DMA Mode.
1276 dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", HOSTNO);
1278 if (hostdata->connected) {
1279 NCR5380_dma_complete(instance);
1280 queue_work(hostdata->work_q, &hostdata->main_task);
1282 NCR5380_write(MODE_REG, MR_BASE);
1283 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1286 #endif /* REAL_DMA */
1287 if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) &&
1288 (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) {
1289 /* Probably reselected */
1290 NCR5380_write(SELECT_ENABLE_REG, 0);
1291 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1293 dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n",
1296 if (!hostdata->connected) {
1297 NCR5380_reselect(instance);
1298 queue_work(hostdata->work_q, &hostdata->main_task);
1300 if (!hostdata->connected)
1301 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1303 /* Probably Bus Reset */
1304 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1306 dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", HOSTNO);
1307 #ifdef SUN3_SCSI_VME
1308 dregs->csr |= CSR_DMA_ENABLE;
1313 shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n");
1314 #ifdef SUN3_SCSI_VME
1315 dregs->csr |= CSR_DMA_ENABLE;
1319 return IRQ_RETVAL(handled);
1323 * Function : int NCR5380_select(struct Scsi_Host *instance,
1324 * struct scsi_cmnd *cmd)
1326 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1327 * including ARBITRATION, SELECTION, and initial message out for
1328 * IDENTIFY and queue messages.
1330 * Inputs : instance - instantiation of the 5380 driver on which this
1331 * target lives, cmd - SCSI command to execute.
1333 * Returns : -1 if selection failed but should be retried.
1334 * 0 if selection failed and should not be retried.
1335 * 0 if selection succeeded completely (hostdata->connected == cmd).
1338 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1339 * with registers as they should have been on entry - ie
1340 * SELECT_ENABLE will be set appropriately, the NCR5380
1341 * will cease to drive any SCSI bus signals.
1343 * If successful : I_T_L or I_T_L_Q nexus will be established,
1344 * instance->connected will be set to cmd.
1345 * SELECT interrupt will be disabled.
1347 * If failed (no target) : cmd->scsi_done() will be called, and the
1348 * cmd->result host byte set to DID_BAD_TARGET.
1351 static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
1353 SETUP_HOSTDATA(instance);
1354 unsigned char tmp[3], phase;
1355 unsigned char *data;
1358 unsigned long flags;
1360 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
1361 dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO,
1365 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1366 * data bus during SELECTION.
1369 local_irq_save(flags);
1370 if (hostdata->connected) {
1371 local_irq_restore(flags);
1374 NCR5380_write(TARGET_COMMAND_REG, 0);
1377 * Start arbitration.
1380 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1381 NCR5380_write(MODE_REG, MR_ARBITRATE);
1383 /* The chip now waits for BUS FREE phase. Then after the 800 ns
1384 * Bus Free Delay, arbitration will begin.
1387 local_irq_restore(flags);
1388 err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0,
1389 INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS,
1390 ICR_ARBITRATION_PROGRESS, HZ);
1391 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) {
1392 /* Reselection interrupt */
1396 NCR5380_write(MODE_REG, MR_BASE);
1397 shost_printk(KERN_ERR, instance,
1398 "select: arbitration timeout\n");
1402 /* The SCSI-2 arbitration delay is 2.4 us */
1405 /* Check for lost arbitration */
1406 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1407 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1408 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1409 hostdata->connected) {
1410 NCR5380_write(MODE_REG, MR_BASE);
1411 dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1416 /* After/during arbitration, BSY should be asserted.
1417 * IBM DPES-31080 Version S31Q works now
1418 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1420 NCR5380_write(INITIATOR_COMMAND_REG,
1421 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
1423 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1424 hostdata->connected) {
1425 NCR5380_write(MODE_REG, MR_BASE);
1426 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1427 dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1433 * Again, bus clear + bus settle time is 1.2us, however, this is
1434 * a minimum so we'll udelay ceil(1.2)
1437 if (hostdata->flags & FLAG_TOSHIBA_DELAY)
1442 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */
1443 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE))
1446 dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO);
1449 * Now that we have won arbitration, start Selection process, asserting
1450 * the host and target ID's on the SCSI bus.
1453 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1456 * Raise ATN while SEL is true before BSY goes false from arbitration,
1457 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1458 * phase immediately after selection.
1461 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1462 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1463 NCR5380_write(MODE_REG, MR_BASE);
1466 * Reselect interrupts must be turned off prior to the dropping of BSY,
1467 * otherwise we will trigger an interrupt.
1470 if (hostdata->connected) {
1471 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1475 NCR5380_write(SELECT_ENABLE_REG, 0);
1478 * The initiator shall then wait at least two deskew delays and release
1481 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1484 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1485 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1488 * Something weird happens when we cease to drive BSY - looks
1489 * like the board/chip is letting us do another read before the
1490 * appropriate propagation delay has expired, and we're confusing
1491 * a BSY signal from ourselves as the target's response to SELECTION.
1493 * A small delay (the 'C++' frontend breaks the pipeline with an
1494 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1495 * tighter 'C' code breaks and requires this) solves the problem -
1496 * the 1 us delay is arbitrary, and only used because this delay will
1497 * be the same on other platforms and since it works here, it should
1500 * wingel suggests that this could be due to failing to wait
1506 dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1509 * The SCSI specification calls for a 250 ms timeout for the actual
1513 err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY,
1514 msecs_to_jiffies(250));
1516 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1517 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1518 NCR5380_reselect(instance);
1519 if (!hostdata->connected)
1520 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1521 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1527 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1528 cmd->result = DID_BAD_TARGET << 16;
1532 cmd->scsi_done(cmd);
1533 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1534 dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO);
1539 * No less than two deskew delays after the initiator detects the
1540 * BSY signal is true, it shall release the SEL signal and may
1541 * change the DATA BUS. -wingel
1546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1549 * Since we followed the SCSI spec, and raised ATN while SEL
1550 * was true but before BSY was false during selection, the information
1551 * transfer phase should be a MESSAGE OUT phase so that we can send the
1554 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1555 * message (2 bytes) with a tag ID that we increment with every command
1556 * until it wraps back to 0.
1558 * XXX - it turns out that there are some broken SCSI-II devices,
1559 * which claim to support tagged queuing but fail when more than
1560 * some number of commands are issued at once.
1563 /* Wait for start of REQ/ACK handshake */
1565 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
1567 shost_printk(KERN_ERR, instance, "select: REQ timeout\n");
1568 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1569 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1573 dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1574 HOSTNO, cmd->device->id);
1575 tmp[0] = IDENTIFY(1, cmd->device->lun);
1578 if (cmd->tag != TAG_NONE) {
1579 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1587 #endif /* SUPPORT_TAGS */
1589 /* Send message(s) */
1591 phase = PHASE_MSGOUT;
1592 NCR5380_transfer_pio(instance, &phase, &len, &data);
1593 dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO);
1594 /* XXX need to handle errors here */
1595 hostdata->connected = cmd;
1596 #ifndef SUPPORT_TAGS
1597 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1599 #ifdef SUN3_SCSI_VME
1600 dregs->csr |= CSR_INTR;
1603 initialize_SCp(cmd);
1609 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1610 * unsigned char *phase, int *count, unsigned char **data)
1612 * Purpose : transfers data in given phase using polled I/O
1614 * Inputs : instance - instance of driver, *phase - pointer to
1615 * what phase is expected, *count - pointer to number of
1616 * bytes to transfer, **data - pointer to data pointer.
1618 * Returns : -1 when different phase is entered without transferring
1619 * maximum number of bytes, 0 if all bytes are transferred or exit
1622 * Also, *phase, *count, *data are modified in place.
1624 * XXX Note : handling for bus free may be useful.
1628 * Note : this code is not as quick as it could be, however it
1629 * IS 100% reliable, and for the actual data transfer where speed
1630 * counts, we will always do a pseudo DMA or DMA transfer.
1633 static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1634 unsigned char *phase, int *count,
1635 unsigned char **data)
1637 register unsigned char p = *phase, tmp;
1638 register int c = *count;
1639 register unsigned char *d = *data;
1642 * The NCR5380 chip will only drive the SCSI bus when the
1643 * phase specified in the appropriate bits of the TARGET COMMAND
1644 * REGISTER match the STATUS REGISTER
1647 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1651 * Wait for assertion of REQ, after which the phase bits will be
1655 if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0)
1658 dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO);
1660 /* Check for phase mismatch */
1661 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) {
1662 dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO);
1663 NCR5380_dprint_phase(NDEBUG_PIO, instance);
1667 /* Do actual transfer from SCSI bus to / from memory */
1669 NCR5380_write(OUTPUT_DATA_REG, *d);
1671 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1676 * The SCSI standard suggests that in MSGOUT phase, the initiator
1677 * should drop ATN on the last byte of the message phase
1678 * after REQ has been asserted for the handshake but before
1679 * the initiator raises ACK.
1683 if (!((p & SR_MSG) && c > 1)) {
1684 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1685 NCR5380_dprint(NDEBUG_PIO, instance);
1686 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1687 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1689 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1690 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1691 NCR5380_dprint(NDEBUG_PIO, instance);
1692 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1693 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1696 NCR5380_dprint(NDEBUG_PIO, instance);
1697 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1700 if (NCR5380_poll_politely(instance,
1701 STATUS_REG, SR_REQ, 0, 5 * HZ) < 0)
1704 dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO);
1707 * We have several special cases to consider during REQ/ACK handshaking :
1708 * 1. We were in MSGOUT phase, and we are on the last byte of the
1709 * message. ATN must be dropped as ACK is dropped.
1711 * 2. We are in a MSGIN phase, and we are on the last byte of the
1712 * message. We must exit with ACK asserted, so that the calling
1713 * code may raise ATN before dropping ACK to reject the message.
1715 * 3. ACK and ATN are clear and the target may proceed as normal.
1717 if (!(p == PHASE_MSGIN && c == 1)) {
1718 if (p == PHASE_MSGOUT && c > 1)
1719 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1721 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1725 dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c);
1729 tmp = NCR5380_read(STATUS_REG);
1730 /* The phase read from the bus is valid if either REQ is (already)
1731 * asserted or if ACK hasn't been released yet. The latter applies if
1732 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1734 if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0))
1735 *phase = tmp & PHASE_MASK;
1737 *phase = PHASE_UNKNOWN;
1739 if (!c || (*phase == p))
1746 * do_reset - issue a reset command
1747 * @instance: adapter to reset
1749 * Issue a reset sequence to the NCR5380 and try and get the bus
1750 * back into sane shape.
1752 * This clears the reset interrupt flag because there may be no handler for
1753 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1754 * been installed. And when in EH we may have released the ST DMA interrupt.
1757 static void do_reset(struct Scsi_Host *instance)
1759 unsigned long flags;
1761 local_irq_save(flags);
1762 NCR5380_write(TARGET_COMMAND_REG,
1763 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
1764 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
1766 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1767 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1768 local_irq_restore(flags);
1772 * do_abort - abort the currently established nexus by going to
1773 * MESSAGE OUT phase and sending an ABORT message.
1774 * @instance: relevant scsi host instance
1776 * Returns 0 on success, -1 on failure.
1779 static int do_abort(struct Scsi_Host *instance)
1781 unsigned char tmp, *msgptr, phase;
1785 /* Request message out phase */
1786 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1789 * Wait for the target to indicate a valid phase by asserting
1790 * REQ. Once this happens, we'll have either a MSGOUT phase
1791 * and can immediately send the ABORT message, or we'll have some
1792 * other phase and will have to source/sink data.
1794 * We really don't care what value was on the bus or what value
1795 * the target sees, so we just handshake.
1798 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ);
1802 tmp = NCR5380_read(STATUS_REG) & PHASE_MASK;
1804 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1806 if (tmp != PHASE_MSGOUT) {
1807 NCR5380_write(INITIATOR_COMMAND_REG,
1808 ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1809 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ);
1812 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1818 phase = PHASE_MSGOUT;
1819 NCR5380_transfer_pio(instance, &phase, &len, &msgptr);
1822 * If we got here, and the command completed successfully,
1823 * we're about to go into bus free state.
1826 return len ? -1 : 0;
1829 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1833 #if defined(REAL_DMA)
1835 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1836 * unsigned char *phase, int *count, unsigned char **data)
1838 * Purpose : transfers data in given phase using either real
1841 * Inputs : instance - instance of driver, *phase - pointer to
1842 * what phase is expected, *count - pointer to number of
1843 * bytes to transfer, **data - pointer to data pointer.
1845 * Returns : -1 when different phase is entered without transferring
1846 * maximum number of bytes, 0 if all bytes or transferred or exit
1849 * Also, *phase, *count, *data are modified in place.
1854 static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1855 unsigned char *phase, int *count,
1856 unsigned char **data)
1858 SETUP_HOSTDATA(instance);
1859 register int c = *count;
1860 register unsigned char p = *phase;
1861 unsigned long flags;
1863 #if defined(CONFIG_SUN3)
1865 if (!sun3_dma_setup_done) {
1866 pr_err("scsi%d: transfer_dma without setup!\n",
1870 hostdata->dma_len = c;
1872 dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1873 instance->host_no, (p & SR_IO) ? "reading" : "writing",
1874 c, (p & SR_IO) ? "to" : "from", *data);
1876 /* netbsd turns off ints here, why not be safe and do it too */
1877 local_irq_save(flags);
1879 /* send start chain */
1880 sun3scsi_dma_start(c, *data);
1882 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1883 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1884 MR_ENABLE_EOP_INTR);
1886 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1887 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1889 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1890 NCR5380_write(START_DMA_SEND_REG, 0);
1893 #ifdef SUN3_SCSI_VME
1894 dregs->csr |= CSR_DMA_ENABLE;
1897 local_irq_restore(flags);
1899 sun3_dma_active = 1;
1901 #else /* !defined(CONFIG_SUN3) */
1902 register unsigned char *d = *data;
1905 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1910 if (hostdata->read_overruns && (p & SR_IO))
1911 c -= hostdata->read_overruns;
1913 dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1914 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1915 c, (p & SR_IO) ? "to" : "from", d);
1917 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1918 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1919 MR_ENABLE_EOP_INTR);
1921 if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) {
1922 /* On the Medusa, it is a must to initialize the DMA before
1923 * starting the NCR. This is also the cleaner way for the TT.
1925 local_irq_save(flags);
1926 hostdata->dma_len = (p & SR_IO) ?
1927 NCR5380_dma_read_setup(instance, d, c) :
1928 NCR5380_dma_write_setup(instance, d, c);
1929 local_irq_restore(flags);
1933 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1935 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1936 NCR5380_write(START_DMA_SEND_REG, 0);
1939 if (hostdata->flags & FLAG_LATE_DMA_SETUP) {
1940 /* On the Falcon, the DMA setup must be done after the last */
1941 /* NCR access, else the DMA setup gets trashed!
1943 local_irq_save(flags);
1944 hostdata->dma_len = (p & SR_IO) ?
1945 NCR5380_dma_read_setup(instance, d, c) :
1946 NCR5380_dma_write_setup(instance, d, c);
1947 local_irq_restore(flags);
1949 #endif /* !defined(CONFIG_SUN3) */
1953 #endif /* defined(REAL_DMA) */
1956 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1958 * Purpose : run through the various SCSI phases and do as the target
1959 * directs us to. Operates on the currently connected command,
1960 * instance->connected.
1962 * Inputs : instance, instance for which we are doing commands
1964 * Side effects : SCSI things happen, the disconnected queue will be
1965 * modified if a command disconnects, *instance->connected will
1968 * XXX Note : we need to watch for bus free or a reset condition here
1969 * to recover from an unexpected bus free condition.
1972 static void NCR5380_information_transfer(struct Scsi_Host *instance)
1974 SETUP_HOSTDATA(instance);
1975 unsigned long flags;
1976 unsigned char msgout = NOP;
1979 #if defined(REAL_DMA)
1982 unsigned char *data;
1983 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
1984 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1986 #ifdef SUN3_SCSI_VME
1987 dregs->csr |= CSR_INTR;
1991 tmp = NCR5380_read(STATUS_REG);
1992 /* We only have a valid SCSI phase when REQ is asserted */
1994 phase = (tmp & PHASE_MASK);
1995 if (phase != old_phase) {
1997 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
1999 #if defined(CONFIG_SUN3)
2000 if (phase == PHASE_CMDOUT) {
2001 #if defined(REAL_DMA)
2003 unsigned long count;
2005 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2006 count = cmd->SCp.buffer->length;
2007 d = sg_virt(cmd->SCp.buffer);
2009 count = cmd->SCp.this_residual;
2012 /* this command setup for dma yet? */
2013 if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) {
2014 if (cmd->request->cmd_type == REQ_TYPE_FS) {
2015 sun3scsi_dma_setup(d, count,
2016 rq_data_dir(cmd->request));
2017 sun3_dma_setup_done = cmd;
2021 #ifdef SUN3_SCSI_VME
2022 dregs->csr |= CSR_INTR;
2025 #endif /* CONFIG_SUN3 */
2027 if (sink && (phase != PHASE_MSGOUT)) {
2028 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2030 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2032 while (NCR5380_read(STATUS_REG) & SR_REQ)
2034 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2042 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2043 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2044 "aborted\n", HOSTNO);
2047 cmd->result = DID_ERROR << 16;
2048 cmd->scsi_done(cmd);
2053 * If there is no room left in the current buffer in the
2054 * scatter-gather list, move onto the next one.
2057 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2059 --cmd->SCp.buffers_residual;
2060 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2061 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
2062 /* ++roman: Try to merge some scatter-buffers if
2063 * they are at contiguous physical addresses.
2065 merge_contiguous_buffers(cmd);
2066 dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n",
2067 HOSTNO, cmd->SCp.this_residual,
2068 cmd->SCp.buffers_residual);
2072 * The preferred transfer method is going to be
2073 * PSEUDO-DMA for systems that are strictly PIO,
2074 * since we can let the hardware do the handshaking.
2076 * For this to work, we need to know the transfersize
2077 * ahead of time, since the pseudo-DMA code will sit
2078 * in an unconditional loop.
2081 /* ++roman: I suggest, this should be
2083 * instead of leaving REAL_DMA out.
2086 #if defined(REAL_DMA)
2087 #if !defined(CONFIG_SUN3)
2089 if (!cmd->device->borken)
2091 transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);
2093 if (transfersize >= DMA_MIN_SIZE) {
2095 cmd->SCp.phase = phase;
2096 if (NCR5380_transfer_dma(instance, &phase,
2097 &len, (unsigned char **)&cmd->SCp.ptr)) {
2099 * If the watchdog timer fires, all future
2100 * accesses to this device will use the
2102 scmd_printk(KERN_INFO, cmd,
2103 "switching to slow handshake\n");
2104 cmd->device->borken = 1;
2107 cmd->result = DID_ERROR << 16;
2108 cmd->scsi_done(cmd);
2109 /* XXX - need to source or sink data here, as appropriate */
2112 /* ++roman: When using real DMA,
2113 * information_transfer() should return after
2114 * starting DMA since it has nothing more to
2119 cmd->SCp.this_residual -= transfersize - len;
2123 #endif /* defined(REAL_DMA) */
2124 NCR5380_transfer_pio(instance, &phase,
2125 (int *)&cmd->SCp.this_residual,
2126 (unsigned char **)&cmd->SCp.ptr);
2127 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2128 /* if we had intended to dma that command clear it */
2129 if (sun3_dma_setup_done == cmd)
2130 sun3_dma_setup_done = NULL;
2136 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2137 NCR5380_transfer_pio(instance, &phase, &len, &data);
2138 cmd->SCp.Message = tmp;
2142 case COMMAND_COMPLETE:
2143 /* Accept message by clearing ACK */
2144 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2145 dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu "
2146 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2148 local_irq_save(flags);
2149 hostdata->connected = NULL;
2152 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2153 struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun];
2154 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned "
2155 "QUEUE_FULL after %d commands\n",
2156 HOSTNO, cmd->device->id, cmd->device->lun,
2158 if (ta->queue_size > ta->nr_allocated)
2159 ta->queue_size = ta->nr_allocated;
2162 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2164 /* Enable reselect interrupts */
2165 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2168 * I'm not sure what the correct thing to do here is :
2170 * If the command that just executed is NOT a request
2171 * sense, the obvious thing to do is to set the result
2172 * code to the values of the stored parameters.
2174 * If it was a REQUEST SENSE command, we need some way to
2175 * differentiate between the failure code of the original
2176 * and the failure code of the REQUEST sense - the obvious
2177 * case is success, where we fall through and leave the
2178 * result code unchanged.
2180 * The non-obvious place is where the REQUEST SENSE failed
2183 if (cmd->cmnd[0] != REQUEST_SENSE)
2184 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2185 else if (status_byte(cmd->SCp.Status) != GOOD)
2186 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2188 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2189 hostdata->ses.cmd_len) {
2190 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2191 hostdata->ses.cmd_len = 0 ;
2194 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2195 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2196 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2198 dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO);
2200 LIST(cmd,hostdata->issue_queue);
2201 SET_NEXT(cmd, hostdata->issue_queue);
2202 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
2203 dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of "
2204 "issue queue\n", H_NO(cmd));
2206 cmd->scsi_done(cmd);
2210 * Restore phase bits to 0 so an interrupted selection,
2211 * arbitration can resume.
2213 NCR5380_write(TARGET_COMMAND_REG, 0);
2215 /* Enable reselect interrupts */
2216 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2218 /* ++roman: For Falcon SCSI, release the lock on the
2219 * ST-DMA here if no other commands are waiting on the
2220 * disconnected queue.
2222 maybe_release_dma_irq(instance);
2223 local_irq_restore(flags);
2225 case MESSAGE_REJECT:
2226 /* Accept message by clearing ACK */
2227 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2228 /* Enable reselect interrupts */
2229 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2230 switch (hostdata->last_message) {
2231 case HEAD_OF_QUEUE_TAG:
2232 case ORDERED_QUEUE_TAG:
2233 case SIMPLE_QUEUE_TAG:
2234 /* The target obviously doesn't support tagged
2235 * queuing, even though it announced this ability in
2236 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2237 * clear 'tagged_supported' and lock the LUN, since
2238 * the command is treated as untagged further on.
2240 cmd->device->tagged_supported = 0;
2241 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2242 cmd->tag = TAG_NONE;
2243 dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected "
2244 "QUEUE_TAG message; tagged queuing "
2246 HOSTNO, cmd->device->id, cmd->device->lun);
2251 /* Accept message by clearing ACK */
2252 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2253 local_irq_save(flags);
2254 LIST(cmd,hostdata->disconnected_queue);
2255 SET_NEXT(cmd, hostdata->disconnected_queue);
2256 hostdata->connected = NULL;
2257 hostdata->disconnected_queue = cmd;
2258 local_irq_restore(flags);
2259 dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was "
2260 "moved from connected to the "
2261 "disconnected_queue\n", HOSTNO,
2262 cmd->device->id, cmd->device->lun);
2264 * Restore phase bits to 0 so an interrupted selection,
2265 * arbitration can resume.
2267 NCR5380_write(TARGET_COMMAND_REG, 0);
2269 /* Enable reselect interrupts */
2270 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2271 #ifdef SUN3_SCSI_VME
2272 dregs->csr |= CSR_DMA_ENABLE;
2276 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2277 * operation, in violation of the SCSI spec so we can safely
2278 * ignore SAVE/RESTORE pointers calls.
2280 * Unfortunately, some disks violate the SCSI spec and
2281 * don't issue the required SAVE_POINTERS message before
2282 * disconnecting, and we have to break spec to remain
2286 case RESTORE_POINTERS:
2287 /* Accept message by clearing ACK */
2288 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2289 /* Enable reselect interrupts */
2290 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2292 case EXTENDED_MESSAGE:
2294 * Extended messages are sent in the following format :
2296 * 0 EXTENDED_MESSAGE == 1
2297 * 1 length (includes one byte for code, doesn't
2298 * include first two bytes)
2300 * 3..length+1 arguments
2302 * Start the extended message buffer with the EXTENDED_MESSAGE
2303 * byte, since spi_print_msg() wants the whole thing.
2305 extended_msg[0] = EXTENDED_MESSAGE;
2306 /* Accept first byte by clearing ACK */
2307 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2309 dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO);
2312 data = extended_msg + 1;
2313 phase = PHASE_MSGIN;
2314 NCR5380_transfer_pio(instance, &phase, &len, &data);
2315 dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2316 (int)extended_msg[1], (int)extended_msg[2]);
2318 if (!len && extended_msg[1] > 0 &&
2319 extended_msg[1] <= sizeof(extended_msg) - 2) {
2320 /* Accept third byte by clearing ACK */
2321 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2322 len = extended_msg[1] - 1;
2323 data = extended_msg + 3;
2324 phase = PHASE_MSGIN;
2326 NCR5380_transfer_pio(instance, &phase, &len, &data);
2327 dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n",
2330 switch (extended_msg[2]) {
2333 case EXTENDED_MODIFY_DATA_POINTER:
2334 case EXTENDED_EXTENDED_IDENTIFY:
2338 printk(KERN_NOTICE "scsi%d: error receiving "
2339 "extended message\n", HOSTNO);
2342 printk(KERN_NOTICE "scsi%d: extended message "
2343 "code %02x length %d is too long\n",
2344 HOSTNO, extended_msg[2], extended_msg[1]);
2347 /* Fall through to reject message */
2350 * If we get something weird that we aren't expecting,
2355 printk(KERN_INFO "scsi%d: rejecting message ",
2357 spi_print_msg(extended_msg);
2359 } else if (tmp != EXTENDED_MESSAGE)
2360 scmd_printk(KERN_INFO, cmd,
2361 "rejecting unknown message %02x\n",
2364 scmd_printk(KERN_INFO, cmd,
2365 "rejecting unknown extended message code %02x, length %d\n",
2366 extended_msg[1], extended_msg[0]);
2368 msgout = MESSAGE_REJECT;
2369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2371 } /* switch (tmp) */
2376 hostdata->last_message = msgout;
2377 NCR5380_transfer_pio(instance, &phase, &len, &data);
2378 if (msgout == ABORT) {
2379 local_irq_save(flags);
2383 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2385 hostdata->connected = NULL;
2386 cmd->result = DID_ERROR << 16;
2387 maybe_release_dma_irq(instance);
2388 local_irq_restore(flags);
2389 cmd->scsi_done(cmd);
2390 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2399 * XXX for performance reasons, on machines with a
2400 * PSEUDO-DMA architecture we should probably
2401 * use the dma transfer function.
2403 NCR5380_transfer_pio(instance, &phase, &len, &data);
2408 NCR5380_transfer_pio(instance, &phase, &len, &data);
2409 cmd->SCp.Status = tmp;
2412 printk("scsi%d: unknown phase\n", HOSTNO);
2413 NCR5380_dprint(NDEBUG_ANY, instance);
2414 } /* switch(phase) */
2416 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
2422 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2424 * Purpose : does reselection, initializing the instance->connected
2425 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2426 * nexus has been reestablished,
2428 * Inputs : instance - this instance of the NCR5380.
2433 /* it might eventually prove necessary to do a dma setup on
2434 reselection, but it doesn't seem to be needed now -- sam */
2436 static void NCR5380_reselect(struct Scsi_Host *instance)
2438 SETUP_HOSTDATA(instance);
2439 unsigned char target_mask;
2444 unsigned char msg[3];
2445 int __maybe_unused len;
2446 unsigned char __maybe_unused *data, __maybe_unused phase;
2447 struct scsi_cmnd *tmp = NULL, *prev;
2450 * Disable arbitration, etc. since the host adapter obviously
2451 * lost, and tell an interrupted NCR5380_select() to restart.
2454 NCR5380_write(MODE_REG, MR_BASE);
2456 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2458 dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO);
2461 * At this point, we have detected that our SCSI ID is on the bus,
2462 * SEL is true and BSY was false for at least one bus settle delay
2465 * We must assert BSY ourselves, until the target drops the SEL
2469 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2470 if (NCR5380_poll_politely(instance,
2471 STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) {
2472 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2475 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2478 * Wait for target to go into MSGIN.
2481 if (NCR5380_poll_politely(instance,
2482 STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) {
2487 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2488 /* acknowledge toggle to MSGIN */
2489 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2491 /* peek at the byte without really hitting the bus */
2492 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2496 phase = PHASE_MSGIN;
2497 NCR5380_transfer_pio(instance, &phase, &len, &data);
2505 if (!(msg[0] & 0x80)) {
2506 shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got ");
2512 lun = msg[0] & 0x07;
2514 #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
2515 /* If the phase is still MSGIN, the target wants to send some more
2516 * messages. In case it supports tagged queuing, this is probably a
2517 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2520 if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) {
2521 /* Accept previous IDENTIFY message by clearing ACK */
2522 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2525 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2526 msg[1] == SIMPLE_QUEUE_TAG)
2528 dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at "
2529 "reselection\n", HOSTNO, target_mask, lun, tag);
2534 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2535 * just reestablished, and remove it from the disconnected queue.
2538 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2539 tmp; prev = tmp, tmp = NEXT(tmp)) {
2540 if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun)
2542 && (tag == tmp->tag)
2546 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2547 SET_NEXT(prev, NEXT(tmp));
2549 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2550 hostdata->disconnected_queue = NEXT(tmp);
2552 SET_NEXT(tmp, NULL);
2559 shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n",
2560 target_mask, lun, tag);
2562 shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n",
2566 * Since we have an established nexus that we can't do anything
2567 * with, we must abort it.
2573 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2574 /* engage dma setup for the command we just saw */
2577 unsigned long count;
2579 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2580 count = tmp->SCp.buffer->length;
2581 d = sg_virt(tmp->SCp.buffer);
2583 count = tmp->SCp.this_residual;
2586 /* setup this command for dma if not already */
2587 if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) {
2588 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2589 sun3_dma_setup_done = tmp;
2593 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2596 /* Accept message by clearing ACK */
2597 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2599 #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
2600 /* If the phase is still MSGIN, the target wants to send some more
2601 * messages. In case it supports tagged queuing, this is probably a
2602 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2605 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2606 /* Accept previous IDENTIFY message by clearing ACK */
2607 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2610 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2611 msg[1] == SIMPLE_QUEUE_TAG)
2613 dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n"
2614 HOSTNO, target_mask, lun, tag);
2618 hostdata->connected = tmp;
2619 dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2620 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2625 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
2627 * Purpose : abort a command
2629 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
2630 * host byte of the result field to, if zero DID_ABORTED is
2633 * Returns : SUCCESS - success, FAILED on failure.
2635 * XXX - there is no way to abort the command that is currently
2636 * connected, you have to wait for it to complete. If this is
2637 * a problem, we could implement longjmp() / setjmp(), setjmp()
2638 * called where the loop started in NCR5380_main().
2642 int NCR5380_abort(struct scsi_cmnd *cmd)
2644 struct Scsi_Host *instance = cmd->device->host;
2645 SETUP_HOSTDATA(instance);
2646 struct scsi_cmnd *tmp, **prev;
2647 unsigned long flags;
2649 scmd_printk(KERN_NOTICE, cmd, "aborting command\n");
2651 NCR5380_print_status(instance);
2653 local_irq_save(flags);
2655 dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2656 NCR5380_read(BUS_AND_STATUS_REG),
2657 NCR5380_read(STATUS_REG));
2661 * Case 1 : If the command is the currently executing command,
2662 * we'll set the aborted flag and return control so that
2663 * information transfer routine can exit cleanly.
2666 if (hostdata->connected == cmd) {
2668 dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO);
2670 * We should perform BSY checking, and make sure we haven't slipped
2674 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2676 * Since we can't change phases until we've completed the current
2677 * handshake, we have to source or sink a byte of data if the current
2678 * phase is not MSGOUT.
2682 * Return control to the executing NCR drive so we can clear the
2683 * aborted flag and get back into our main loop.
2686 if (do_abort(instance) == 0) {
2687 hostdata->connected = NULL;
2688 cmd->result = DID_ABORT << 16;
2692 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2694 maybe_release_dma_irq(instance);
2695 local_irq_restore(flags);
2696 cmd->scsi_done(cmd);
2699 local_irq_restore(flags);
2700 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2707 * Case 2 : If the command hasn't been issued yet, we simply remove it
2708 * from the issue queue.
2710 for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue),
2711 tmp = (struct scsi_cmnd *)hostdata->issue_queue;
2712 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2714 REMOVE(5, *prev, tmp, NEXT(tmp));
2715 (*prev) = NEXT(tmp);
2716 SET_NEXT(tmp, NULL);
2717 tmp->result = DID_ABORT << 16;
2718 maybe_release_dma_irq(instance);
2719 local_irq_restore(flags);
2720 dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n",
2722 /* Tagged queuing note: no tag to free here, hasn't been assigned
2724 tmp->scsi_done(tmp);
2730 * Case 3 : If any commands are connected, we're going to fail the abort
2731 * and let the high level SCSI driver retry at a later time or
2734 * Timeouts, and therefore aborted commands, will be highly unlikely
2735 * and handling them cleanly in this situation would make the common
2736 * case of noresets less efficient, and would pollute our code. So,
2740 if (hostdata->connected) {
2741 local_irq_restore(flags);
2742 dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO);
2747 * Case 4: If the command is currently disconnected from the bus, and
2748 * there are no connected commands, we reconnect the I_T_L or
2749 * I_T_L_Q nexus associated with it, go into message out, and send
2752 * This case is especially ugly. In order to reestablish the nexus, we
2753 * need to call NCR5380_select(). The easiest way to implement this
2754 * function was to abort if the bus was busy, and let the interrupt
2755 * handler triggered on the SEL for reselect take care of lost arbitrations
2756 * where necessary, meaning interrupts need to be enabled.
2758 * When interrupts are enabled, the queues may change - so we
2759 * can't remove it from the disconnected queue before selecting it
2760 * because that could cause a failure in hashing the nexus if that
2761 * device reselected.
2763 * Since the queues may change, we can't use the pointers from when we
2766 * So, we must first locate the command, and if NCR5380_select()
2767 * succeeds, then issue the abort, relocate the command and remove
2768 * it from the disconnected queue.
2771 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2774 local_irq_restore(flags);
2775 dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO);
2777 if (NCR5380_select(instance, cmd))
2780 dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO);
2784 local_irq_save(flags);
2785 for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue),
2786 tmp = (struct scsi_cmnd *)hostdata->disconnected_queue;
2787 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2789 REMOVE(5, *prev, tmp, NEXT(tmp));
2791 SET_NEXT(tmp, NULL);
2792 tmp->result = DID_ABORT << 16;
2793 /* We must unlock the tag/LUN immediately here, since the
2794 * target goes to BUS FREE and doesn't send us another
2795 * message (COMMAND_COMPLETE or the like)
2800 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2802 maybe_release_dma_irq(instance);
2803 local_irq_restore(flags);
2804 tmp->scsi_done(tmp);
2811 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2812 * possible at all) At least, we should check if the lock could be
2813 * released after the abort, in case it is kept due to some bug.
2815 maybe_release_dma_irq(instance);
2816 local_irq_restore(flags);
2819 * Case 5 : If we reached this point, the command was not found in any of
2822 * We probably reached this point because of an unlikely race condition
2823 * between the command completing successfully and the abortion code,
2824 * so we won't panic, but we will notify the user in case something really
2828 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
2835 * NCR5380_bus_reset - reset the SCSI bus
2836 * @cmd: SCSI command undergoing EH
2841 static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2843 struct Scsi_Host *instance = cmd->device->host;
2844 struct NCR5380_hostdata *hostdata = shost_priv(instance);
2846 unsigned long flags;
2848 local_irq_save(flags);
2850 #if (NDEBUG & NDEBUG_ANY)
2851 scmd_printk(KERN_INFO, cmd, "performing bus reset\n");
2852 NCR5380_print_status(instance);
2857 /* reset NCR registers */
2858 NCR5380_write(MODE_REG, MR_BASE);
2859 NCR5380_write(TARGET_COMMAND_REG, 0);
2860 NCR5380_write(SELECT_ENABLE_REG, 0);
2862 /* After the reset, there are no more connected or disconnected commands
2863 * and no busy units; so clear the low-level status here to avoid
2864 * conflicts when the mid-level code tries to wake up the affected
2868 if (hostdata->issue_queue)
2869 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2870 if (hostdata->connected)
2871 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd));
2872 if (hostdata->disconnected_queue)
2873 dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2875 hostdata->issue_queue = NULL;
2876 hostdata->connected = NULL;
2877 hostdata->disconnected_queue = NULL;
2879 free_all_tags(hostdata);
2881 for (i = 0; i < 8; ++i)
2882 hostdata->busy[i] = 0;
2884 hostdata->dma_len = 0;
2887 maybe_release_dma_irq(instance);
2888 local_irq_restore(flags);