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.
70 * Further development / testing that should be done :
71 * 1. Test linked command handling code after Eric is ready with
72 * the high level code.
75 /* Adapted for the sun3 by Sam Creasey. */
77 #include <scsi/scsi_dbg.h>
78 #include <scsi/scsi_transport_spi.h>
80 #if (NDEBUG & NDEBUG_LISTS)
83 printk("LINE:%d Adding %p to %p\n", \
84 __LINE__, (void*)(x), (void*)(y)); \
88 #define REMOVE(w, x, y, z) \
90 printk("LINE:%d Removing: %p->%p %p->%p \n", \
91 __LINE__, (void*)(w), (void*)(x), \
92 (void*)(y), (void*)(z)); \
98 #define REMOVE(w,x,y,z)
108 * This is a generic 5380 driver. To use it on a different platform,
109 * one simply writes appropriate system specific macros (ie, data
110 * transfer - some PC's will use the I/O bus, 68K's must use
111 * memory mapped) and drops this file in their 'C' wrapper.
113 * As far as command queueing, two queues are maintained for
114 * each 5380 in the system - commands that haven't been issued yet,
115 * and commands that are currently executing. This means that an
116 * unlimited number of commands may be queued, letting
117 * more commands propagate from the higher driver levels giving higher
118 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
119 * allowing multiple commands to propagate all the way to a SCSI-II device
120 * while a command is already executing.
123 * Issues specific to the NCR5380 :
125 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
126 * piece of hardware that requires you to sit in a loop polling for
127 * the REQ signal as long as you are connected. Some devices are
128 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
129 * while doing long seek operations.
131 * The workaround for this is to keep track of devices that have
132 * disconnected. If the device hasn't disconnected, for commands that
133 * should disconnect, we do something like
135 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
137 * Some tweaking of N and M needs to be done. An algorithm based
138 * on "time to data" would give the best results as long as short time
139 * to datas (ie, on the same track) were considered, however these
140 * broken devices are the exception rather than the rule and I'd rather
141 * spend my time optimizing for the normal case.
145 * At the heart of the design is a coroutine, NCR5380_main,
146 * which is started from a workqueue for each NCR5380 host in the
147 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
148 * removing the commands from the issue queue and calling
149 * NCR5380_select() if a nexus is not established.
151 * Once a nexus is established, the NCR5380_information_transfer()
152 * phase goes through the various phases as instructed by the target.
153 * if the target goes into MSG IN and sends a DISCONNECT message,
154 * the command structure is placed into the per instance disconnected
155 * queue, and NCR5380_main tries to find more work. If the target is
156 * idle for too long, the system will try to sleep.
158 * If a command has disconnected, eventually an interrupt will trigger,
159 * calling NCR5380_intr() which will in turn call NCR5380_reselect
160 * to reestablish a nexus. This will run main if necessary.
162 * On command termination, the done function will be called as
165 * SCSI pointers are maintained in the SCp field of SCSI command
166 * structures, being initialized after the command is connected
167 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
168 * Note that in violation of the standard, an implicit SAVE POINTERS operation
169 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
174 * This file a skeleton Linux SCSI driver for the NCR 5380 series
175 * of chips. To use it, you write an architecture specific functions
176 * and macros and include this file in your driver.
178 * These macros control options :
179 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
180 * for commands that return with a CHECK CONDITION status.
182 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
185 * LINKED - if defined, linked commands are supported.
187 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
189 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
191 * These macros MUST be defined :
193 * NCR5380_read(register) - read from the specified register
195 * NCR5380_write(register, value) - write to the specific register
197 * NCR5380_implementation_fields - additional fields needed for this
198 * specific implementation of the NCR5380
200 * Either real DMA *or* pseudo DMA may be implemented
202 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
203 * Note that the DMA setup functions should return the number of bytes
204 * that they were able to program the controller for.
206 * Also note that generic i386/PC versions of these macros are
207 * available as NCR5380_i386_dma_write_setup,
208 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
210 * NCR5380_dma_write_setup(instance, src, count) - initialize
211 * NCR5380_dma_read_setup(instance, dst, count) - initialize
212 * NCR5380_dma_residual(instance); - residual count
215 * NCR5380_pwrite(instance, src, count)
216 * NCR5380_pread(instance, dst, count);
218 * The generic driver is initialized by calling NCR5380_init(instance),
219 * after setting the appropriate host specific fields and ID. If the
220 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
221 * possible) function may be used.
224 /* Macros ease life... :-) */
225 #define SETUP_HOSTDATA(in) \
226 struct NCR5380_hostdata *hostdata = \
227 (struct NCR5380_hostdata *)(in)->hostdata
228 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
230 #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
231 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
232 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble)
234 #define HOSTNO instance->host_no
235 #define H_NO(cmd) (cmd)->device->host->host_no
240 * Functions for handling tagged queuing
241 * =====================================
243 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
245 * Using consecutive numbers for the tags is no good idea in my eyes. There
246 * could be wrong re-usings if the counter (8 bit!) wraps and some early
247 * command has been preempted for a long time. My solution: a bitfield for
248 * remembering used tags.
250 * There's also the problem that each target has a certain queue size, but we
251 * cannot know it in advance :-( We just see a QUEUE_FULL status being
252 * returned. So, in this case, the driver internal queue size assumption is
253 * reduced to the number of active tags if QUEUE_FULL is returned by the
254 * target. The command is returned to the mid-level, but with status changed
255 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
258 * We're also not allowed running tagged commands as long as an untagged
259 * command is active. And REQUEST SENSE commands after a contingent allegiance
260 * condition _must_ be untagged. To keep track whether an untagged command has
261 * been issued, the host->busy array is still employed, as it is without
262 * support for tagged queuing.
264 * One could suspect that there are possible race conditions between
265 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
266 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
267 * which already guaranteed to be running at most once. It is also the only
268 * place where tags/LUNs are allocated. So no other allocation can slip
269 * between that pair, there could only happen a reselection, which can free a
270 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
271 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
274 static void __init
init_tags(struct NCR5380_hostdata
*hostdata
)
277 struct tag_alloc
*ta
;
279 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
282 for (target
= 0; target
< 8; ++target
) {
283 for (lun
= 0; lun
< 8; ++lun
) {
284 ta
= &hostdata
->TagAlloc
[target
][lun
];
285 bitmap_zero(ta
->allocated
, MAX_TAGS
);
286 ta
->nr_allocated
= 0;
287 /* At the beginning, assume the maximum queue size we could
288 * support (MAX_TAGS). This value will be decreased if the target
289 * returns QUEUE_FULL status.
291 ta
->queue_size
= MAX_TAGS
;
297 /* Check if we can issue a command to this LUN: First see if the LUN is marked
298 * busy by an untagged command. If the command should use tagged queuing, also
299 * check that there is a free tag and the target's queue won't overflow. This
300 * function should be called with interrupts disabled to avoid race
304 static int is_lun_busy(struct scsi_cmnd
*cmd
, int should_be_tagged
)
306 u8 lun
= cmd
->device
->lun
;
307 SETUP_HOSTDATA(cmd
->device
->host
);
309 if (hostdata
->busy
[cmd
->device
->id
] & (1 << lun
))
311 if (!should_be_tagged
||
312 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
313 !cmd
->device
->tagged_supported
)
315 if (hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].nr_allocated
>=
316 hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].queue_size
) {
317 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d: no free tags\n",
318 H_NO(cmd
), cmd
->device
->id
, lun
);
325 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
326 * must be called before!), or reserve the LUN in 'busy' if the command is
330 static void cmd_get_tag(struct scsi_cmnd
*cmd
, int should_be_tagged
)
332 u8 lun
= cmd
->device
->lun
;
333 SETUP_HOSTDATA(cmd
->device
->host
);
335 /* If we or the target don't support tagged queuing, allocate the LUN for
336 * an untagged command.
338 if (!should_be_tagged
||
339 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
340 !cmd
->device
->tagged_supported
) {
342 hostdata
->busy
[cmd
->device
->id
] |= (1 << lun
);
343 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d now allocated by untagged "
344 "command\n", H_NO(cmd
), cmd
->device
->id
, lun
);
346 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
348 cmd
->tag
= find_first_zero_bit(ta
->allocated
, MAX_TAGS
);
349 set_bit(cmd
->tag
, ta
->allocated
);
351 dprintk(NDEBUG_TAGS
, "scsi%d: using tag %d for target %d lun %d "
352 "(now %d tags in use)\n",
353 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
,
354 lun
, ta
->nr_allocated
);
359 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
363 static void cmd_free_tag(struct scsi_cmnd
*cmd
)
365 u8 lun
= cmd
->device
->lun
;
366 SETUP_HOSTDATA(cmd
->device
->host
);
368 if (cmd
->tag
== TAG_NONE
) {
369 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << lun
);
370 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d untagged cmd finished\n",
371 H_NO(cmd
), cmd
->device
->id
, lun
);
372 } else if (cmd
->tag
>= MAX_TAGS
) {
373 printk(KERN_NOTICE
"scsi%d: trying to free bad tag %d!\n",
374 H_NO(cmd
), cmd
->tag
);
376 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
377 clear_bit(cmd
->tag
, ta
->allocated
);
379 dprintk(NDEBUG_TAGS
, "scsi%d: freed tag %d for target %d lun %d\n",
380 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
, lun
);
385 static void free_all_tags(struct NCR5380_hostdata
*hostdata
)
388 struct tag_alloc
*ta
;
390 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
393 for (target
= 0; target
< 8; ++target
) {
394 for (lun
= 0; lun
< 8; ++lun
) {
395 ta
= &hostdata
->TagAlloc
[target
][lun
];
396 bitmap_zero(ta
->allocated
, MAX_TAGS
);
397 ta
->nr_allocated
= 0;
402 #endif /* SUPPORT_TAGS */
406 * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd )
408 * Purpose: Try to merge several scatter-gather requests into one DMA
409 * transfer. This is possible if the scatter buffers lie on
410 * physical contiguous addresses.
412 * Parameters: struct scsi_cmnd *cmd
413 * The command to work on. The first scatter buffer's data are
414 * assumed to be already transferred into ptr/this_residual.
417 static void merge_contiguous_buffers(struct scsi_cmnd
*cmd
)
419 #if !defined(CONFIG_SUN3)
420 unsigned long endaddr
;
421 #if (NDEBUG & NDEBUG_MERGING)
422 unsigned long oldlen
= cmd
->SCp
.this_residual
;
426 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
427 cmd
->SCp
.buffers_residual
&&
428 virt_to_phys(sg_virt(&cmd
->SCp
.buffer
[1])) == endaddr
;) {
429 dprintk(NDEBUG_MERGING
, "VTOP(%p) == %08lx -> merging\n",
430 page_address(sg_page(&cmd
->SCp
.buffer
[1])), endaddr
);
431 #if (NDEBUG & NDEBUG_MERGING)
435 --cmd
->SCp
.buffers_residual
;
436 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
437 endaddr
+= cmd
->SCp
.buffer
->length
;
439 #if (NDEBUG & NDEBUG_MERGING)
440 if (oldlen
!= cmd
->SCp
.this_residual
)
441 dprintk(NDEBUG_MERGING
, "merged %d buffers from %p, new length %08x\n",
442 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
444 #endif /* !defined(CONFIG_SUN3) */
448 * initialize_SCp - init the scsi pointer field
449 * @cmd: command block to set up
451 * Set up the internal fields in the SCSI command.
454 static inline void initialize_SCp(struct scsi_cmnd
*cmd
)
457 * Initialize the Scsi Pointer field so that all of the commands in the
458 * various queues are valid.
461 if (scsi_bufflen(cmd
)) {
462 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
463 cmd
->SCp
.buffers_residual
= scsi_sg_count(cmd
) - 1;
464 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
465 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
466 /* ++roman: Try to merge some scatter-buffers if they are at
467 * contiguous physical addresses.
469 merge_contiguous_buffers(cmd
);
471 cmd
->SCp
.buffer
= NULL
;
472 cmd
->SCp
.buffers_residual
= 0;
474 cmd
->SCp
.this_residual
= 0;
478 #include <linux/delay.h>
485 { SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
486 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
487 { SR_SEL
, "SEL" }, {0, NULL
}
489 {BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}
491 {ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
492 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
493 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
496 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"}, {MR_TARGET
, "MODE TARGET"},
497 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR
,
498 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR
,"MODE EOP INTR"},
499 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
500 {MR_DMA_MODE
, "MODE DMA"}, {MR_ARBITRATE
, "MODE ARBITRATION"},
505 * NCR5380_print - print scsi bus signals
506 * @instance: adapter state to dump
508 * Print the SCSI bus signals for debugging purposes
511 static void NCR5380_print(struct Scsi_Host
*instance
)
513 unsigned char status
, data
, basr
, mr
, icr
, i
;
516 local_irq_save(flags
);
517 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
518 status
= NCR5380_read(STATUS_REG
);
519 mr
= NCR5380_read(MODE_REG
);
520 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
521 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
522 local_irq_restore(flags
);
523 printk("STATUS_REG: %02x ", status
);
524 for (i
= 0; signals
[i
].mask
; ++i
)
525 if (status
& signals
[i
].mask
)
526 printk(",%s", signals
[i
].name
);
527 printk("\nBASR: %02x ", basr
);
528 for (i
= 0; basrs
[i
].mask
; ++i
)
529 if (basr
& basrs
[i
].mask
)
530 printk(",%s", basrs
[i
].name
);
531 printk("\nICR: %02x ", icr
);
532 for (i
= 0; icrs
[i
].mask
; ++i
)
533 if (icr
& icrs
[i
].mask
)
534 printk(",%s", icrs
[i
].name
);
535 printk("\nMODE: %02x ", mr
);
536 for (i
= 0; mrs
[i
].mask
; ++i
)
537 if (mr
& mrs
[i
].mask
)
538 printk(",%s", mrs
[i
].name
);
546 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
547 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
548 {PHASE_UNKNOWN
, "UNKNOWN"}
552 * NCR5380_print_phase - show SCSI phase
553 * @instance: adapter to dump
555 * Print the current SCSI phase for debugging purposes
560 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
562 unsigned char status
;
565 status
= NCR5380_read(STATUS_REG
);
566 if (!(status
& SR_REQ
))
567 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
569 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
570 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
572 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
579 * ++roman: New scheme of calling NCR5380_main()
581 * If we're not in an interrupt, we can call our main directly, it cannot be
582 * already running. Else, we queue it on a task queue, if not 'main_running'
583 * tells us that a lower level is already executing it. This way,
584 * 'main_running' needs not be protected in a special way.
586 * queue_main() is a utility function for putting our main onto the task
587 * queue, if main_running is false. It should be called only from a
588 * interrupt or bottom half.
591 #include <linux/gfp.h>
592 #include <linux/workqueue.h>
593 #include <linux/interrupt.h>
595 static inline void queue_main(struct NCR5380_hostdata
*hostdata
)
597 if (!hostdata
->main_running
) {
598 /* If in interrupt and NCR5380_main() not already running,
599 queue it on the 'immediate' task queue, to be processed
600 immediately after the current interrupt processing has
602 schedule_work(&hostdata
->main_task
);
604 /* else: nothing to do: the running NCR5380_main() will pick up
605 any newly queued command. */
609 * NCR58380_info - report driver and host information
610 * @instance: relevant scsi host instance
612 * For use as the host template info() handler.
617 static const char *NCR5380_info(struct Scsi_Host
*instance
)
619 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
621 return hostdata
->info
;
624 static void prepare_info(struct Scsi_Host
*instance
)
626 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
628 snprintf(hostdata
->info
, sizeof(hostdata
->info
),
629 "%s, io_port 0x%lx, n_io_port %d, "
630 "base 0x%lx, irq %d, "
631 "can_queue %d, cmd_per_lun %d, "
632 "sg_tablesize %d, this_id %d, "
635 instance
->hostt
->name
, instance
->io_port
, instance
->n_io_port
,
636 instance
->base
, instance
->irq
,
637 instance
->can_queue
, instance
->cmd_per_lun
,
638 instance
->sg_tablesize
, instance
->this_id
,
639 hostdata
->flags
& FLAG_TAGGED_QUEUING
? "TAGGED_QUEUING " : "",
656 * NCR5380_print_status - dump controller info
657 * @instance: controller to dump
659 * Print commands in the various queues, called from NCR5380_abort
663 static void lprint_Scsi_Cmnd(struct scsi_cmnd
*cmd
)
666 unsigned char *command
;
667 printk("scsi%d: destination target %d, lun %llu\n",
668 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
669 printk(KERN_CONT
" command = ");
671 printk(KERN_CONT
"%2d (0x%02x)", command
[0], command
[0]);
672 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
673 printk(KERN_CONT
" %02x", command
[i
]);
677 static void NCR5380_print_status(struct Scsi_Host
*instance
)
679 struct NCR5380_hostdata
*hostdata
;
680 struct scsi_cmnd
*ptr
;
683 NCR5380_dprint(NDEBUG_ANY
, instance
);
684 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
686 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
688 local_irq_save(flags
);
689 printk("NCR5380: coroutine is%s running.\n",
690 hostdata
->main_running
? "" : "n't");
691 if (!hostdata
->connected
)
692 printk("scsi%d: no currently connected command\n", HOSTNO
);
694 lprint_Scsi_Cmnd((struct scsi_cmnd
*) hostdata
->connected
);
695 printk("scsi%d: issue_queue\n", HOSTNO
);
696 for (ptr
= (struct scsi_cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
))
697 lprint_Scsi_Cmnd(ptr
);
699 printk("scsi%d: disconnected_queue\n", HOSTNO
);
700 for (ptr
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; ptr
;
702 lprint_Scsi_Cmnd(ptr
);
704 local_irq_restore(flags
);
708 static void show_Scsi_Cmnd(struct scsi_cmnd
*cmd
, struct seq_file
*m
)
711 unsigned char *command
;
712 seq_printf(m
, "scsi%d: destination target %d, lun %llu\n",
713 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
714 seq_puts(m
, " command = ");
716 seq_printf(m
, "%2d (0x%02x)", command
[0], command
[0]);
717 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
718 seq_printf(m
, " %02x", command
[i
]);
722 static int __maybe_unused
NCR5380_show_info(struct seq_file
*m
,
723 struct Scsi_Host
*instance
)
725 struct NCR5380_hostdata
*hostdata
;
726 struct scsi_cmnd
*ptr
;
729 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
731 local_irq_save(flags
);
732 seq_printf(m
, "NCR5380: coroutine is%s running.\n",
733 hostdata
->main_running
? "" : "n't");
734 if (!hostdata
->connected
)
735 seq_printf(m
, "scsi%d: no currently connected command\n", HOSTNO
);
737 show_Scsi_Cmnd((struct scsi_cmnd
*) hostdata
->connected
, m
);
738 seq_printf(m
, "scsi%d: issue_queue\n", HOSTNO
);
739 for (ptr
= (struct scsi_cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
))
740 show_Scsi_Cmnd(ptr
, m
);
742 seq_printf(m
, "scsi%d: disconnected_queue\n", HOSTNO
);
743 for (ptr
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; ptr
;
745 show_Scsi_Cmnd(ptr
, m
);
747 local_irq_restore(flags
);
752 * NCR5380_init - initialise an NCR5380
753 * @instance: adapter to configure
754 * @flags: control flags
756 * Initializes *instance and corresponding 5380 chip,
757 * with flags OR'd into the initial flags value.
759 * Notes : I assume that the host, hostno, and id bits have been
760 * set correctly. I don't care about the irq and other fields.
762 * Returns 0 for success
765 static int __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
768 SETUP_HOSTDATA(instance
);
770 hostdata
->host
= instance
;
771 hostdata
->aborted
= 0;
772 hostdata
->id_mask
= 1 << instance
->this_id
;
773 hostdata
->id_higher_mask
= 0;
774 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
775 if (i
> hostdata
->id_mask
)
776 hostdata
->id_higher_mask
|= i
;
777 for (i
= 0; i
< 8; ++i
)
778 hostdata
->busy
[i
] = 0;
782 #if defined (REAL_DMA)
783 hostdata
->dma_len
= 0;
785 hostdata
->targets_present
= 0;
786 hostdata
->connected
= NULL
;
787 hostdata
->issue_queue
= NULL
;
788 hostdata
->disconnected_queue
= NULL
;
789 hostdata
->flags
= flags
;
791 INIT_WORK(&hostdata
->main_task
, NCR5380_main
);
793 prepare_info(instance
);
795 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
796 NCR5380_write(MODE_REG
, MR_BASE
);
797 NCR5380_write(TARGET_COMMAND_REG
, 0);
798 NCR5380_write(SELECT_ENABLE_REG
, 0);
804 * NCR5380_exit - remove an NCR5380
805 * @instance: adapter to remove
807 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
810 static void NCR5380_exit(struct Scsi_Host
*instance
)
812 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
814 cancel_work_sync(&hostdata
->main_task
);
818 * NCR5380_queue_command - queue a command
819 * @instance: the relevant SCSI adapter
822 * cmd is added to the per instance issue_queue, with minor
823 * twiddling done to the host specific fields of cmd. If the
824 * main coroutine is not running, it is restarted.
827 static int NCR5380_queue_command(struct Scsi_Host
*instance
,
828 struct scsi_cmnd
*cmd
)
830 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
831 struct scsi_cmnd
*tmp
;
834 #if (NDEBUG & NDEBUG_NO_WRITE)
835 switch (cmd
->cmnd
[0]) {
838 printk(KERN_NOTICE
"scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
840 cmd
->result
= (DID_ERROR
<< 16);
844 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
847 * We use the host_scribble field as a pointer to the next command
855 * Insert the cmd into the issue queue. Note that REQUEST SENSE
856 * commands are added to the head of the queue since any command will
857 * clear the contingent allegiance condition that exists and the
858 * sense data is only guaranteed to be valid while the condition exists.
861 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
862 * Otherwise a running NCR5380_main may steal the lock.
863 * Lock before actually inserting due to fairness reasons explained in
864 * atari_scsi.c. If we insert first, then it's impossible for this driver
865 * to release the lock.
866 * Stop timer for this command while waiting for the lock, or timeouts
867 * may happen (and they really do), and it's no good if the command doesn't
868 * appear in any of the queues.
869 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
870 * because also a timer int can trigger an abort or reset, which would
871 * alter queues and touch the lock.
873 if (!NCR5380_acquire_dma_irq(instance
))
874 return SCSI_MLQUEUE_HOST_BUSY
;
876 local_irq_save(flags
);
879 * Insert the cmd into the issue queue. Note that REQUEST SENSE
880 * commands are added to the head of the queue since any command will
881 * clear the contingent allegiance condition that exists and the
882 * sense data is only guaranteed to be valid while the condition exists.
885 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
886 LIST(cmd
, hostdata
->issue_queue
);
887 SET_NEXT(cmd
, hostdata
->issue_queue
);
888 hostdata
->issue_queue
= cmd
;
890 for (tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
891 NEXT(tmp
); tmp
= NEXT(tmp
))
896 local_irq_restore(flags
);
898 dprintk(NDEBUG_QUEUES
, "scsi%d: command added to %s of queue\n", H_NO(cmd
),
899 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
901 /* If queue_command() is called from an interrupt (real one or bottom
902 * half), we let queue_main() do the job of taking care about main. If it
903 * is already running, this is a no-op, else main will be queued.
905 * If we're not in an interrupt, we can call NCR5380_main()
906 * unconditionally, because it cannot be already running.
908 if (in_interrupt() || irqs_disabled())
909 queue_main(hostdata
);
911 NCR5380_main(&hostdata
->main_task
);
915 static inline void maybe_release_dma_irq(struct Scsi_Host
*instance
)
917 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
919 /* Caller does the locking needed to set & test these data atomically */
920 if (!hostdata
->disconnected_queue
&&
921 !hostdata
->issue_queue
&&
922 !hostdata
->connected
&&
923 !hostdata
->retain_dma_intr
)
924 NCR5380_release_dma_irq(instance
);
928 * NCR5380_main - NCR state machines
930 * NCR5380_main is a coroutine that runs as long as more work can
931 * be done on the NCR5380 host adapters in a system. Both
932 * NCR5380_queue_command() and NCR5380_intr() will try to start it
933 * in case it is not running.
935 * Locks: called as its own thread with no locks held.
938 static void NCR5380_main(struct work_struct
*work
)
940 struct NCR5380_hostdata
*hostdata
=
941 container_of(work
, struct NCR5380_hostdata
, main_task
);
942 struct Scsi_Host
*instance
= hostdata
->host
;
943 struct scsi_cmnd
*tmp
, *prev
;
948 * We run (with interrupts disabled) until we're sure that none of
949 * the host adapters have anything that can be done, at which point
950 * we set main_running to 0 and exit.
952 * Interrupts are enabled before doing various other internal
953 * instructions, after we've decided that we need to run through
956 * this should prevent any race conditions.
958 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
959 * because also a timer int can trigger an abort or reset, which can
960 * alter queues and touch the Falcon lock.
963 /* Tell int handlers main() is now already executing. Note that
964 no races are possible here. If an int comes in before
965 'main_running' is set here, and queues/executes main via the
966 task queue, it doesn't do any harm, just this instance of main
967 won't find any work left to do. */
968 if (hostdata
->main_running
)
970 hostdata
->main_running
= 1;
972 local_save_flags(flags
);
974 local_irq_disable(); /* Freeze request queues */
977 if (!hostdata
->connected
) {
978 dprintk(NDEBUG_MAIN
, "scsi%d: not connected\n", HOSTNO
);
980 * Search through the issue_queue for a command destined
981 * for a target that's not busy.
983 #if (NDEBUG & NDEBUG_LISTS)
984 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
985 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
987 /*printk("%p ", tmp);*/
988 if ((tmp
== prev
) && tmp
)
990 /* else printk("\n"); */
992 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
,
993 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
994 u8 lun
= tmp
->device
->lun
;
996 dprintk(NDEBUG_LISTS
,
997 "MAIN tmp=%p target=%d busy=%d lun=%d\n",
998 tmp
, scmd_id(tmp
), hostdata
->busy
[scmd_id(tmp
)],
1000 /* When we find one, remove it from the issue queue. */
1001 /* ++guenther: possible race with Falcon locking */
1004 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
1006 !(hostdata
->busy
[tmp
->device
->id
] & (1 << lun
))
1009 /* ++guenther: just to be sure, this must be atomic */
1010 local_irq_disable();
1012 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
1013 SET_NEXT(prev
, NEXT(tmp
));
1015 REMOVE(-1, hostdata
->issue_queue
, tmp
, NEXT(tmp
));
1016 hostdata
->issue_queue
= NEXT(tmp
);
1018 SET_NEXT(tmp
, NULL
);
1019 hostdata
->retain_dma_intr
++;
1021 /* reenable interrupts after finding one */
1022 local_irq_restore(flags
);
1025 * Attempt to establish an I_T_L nexus here.
1026 * On success, instance->hostdata->connected is set.
1027 * On failure, we must add the command back to the
1028 * issue queue so we can keep trying.
1030 dprintk(NDEBUG_MAIN
, "scsi%d: main(): command for target %d "
1031 "lun %d removed from issue_queue\n",
1032 HOSTNO
, tmp
->device
->id
, lun
);
1034 * REQUEST SENSE commands are issued without tagged
1035 * queueing, even on SCSI-II devices because the
1036 * contingent allegiance condition exists for the
1039 /* ++roman: ...and the standard also requires that
1040 * REQUEST SENSE command are untagged.
1044 cmd_get_tag(tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
1046 if (!NCR5380_select(instance
, tmp
)) {
1047 local_irq_disable();
1048 hostdata
->retain_dma_intr
--;
1049 /* release if target did not response! */
1050 maybe_release_dma_irq(instance
);
1051 local_irq_restore(flags
);
1054 local_irq_disable();
1055 LIST(tmp
, hostdata
->issue_queue
);
1056 SET_NEXT(tmp
, hostdata
->issue_queue
);
1057 hostdata
->issue_queue
= tmp
;
1061 hostdata
->retain_dma_intr
--;
1062 local_irq_restore(flags
);
1063 dprintk(NDEBUG_MAIN
, "scsi%d: main(): select() failed, "
1064 "returned to issue_queue\n", HOSTNO
);
1065 if (hostdata
->connected
)
1068 } /* if target/lun/target queue is not busy */
1069 } /* for issue_queue */
1070 } /* if (!hostdata->connected) */
1072 if (hostdata
->connected
1074 && !hostdata
->dma_len
1077 local_irq_restore(flags
);
1078 dprintk(NDEBUG_MAIN
, "scsi%d: main: performing information transfer\n",
1080 NCR5380_information_transfer(instance
);
1081 dprintk(NDEBUG_MAIN
, "scsi%d: main: done set false\n", HOSTNO
);
1086 /* Better allow ints _after_ 'main_running' has been cleared, else
1087 an interrupt could believe we'll pick up the work it left for
1088 us, but we won't see it anymore here... */
1089 hostdata
->main_running
= 0;
1090 local_irq_restore(flags
);
1096 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1098 * Purpose : Called by interrupt handler when DMA finishes or a phase
1099 * mismatch occurs (which would finish the DMA transfer).
1101 * Inputs : instance - this instance of the NCR5380.
1105 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
1107 SETUP_HOSTDATA(instance
);
1109 unsigned char **data
;
1110 volatile int *count
;
1111 int saved_data
= 0, overrun
= 0;
1114 if (!hostdata
->connected
) {
1115 printk(KERN_WARNING
"scsi%d: received end of DMA interrupt with "
1116 "no connected cmd\n", HOSTNO
);
1120 if (hostdata
->read_overruns
) {
1121 p
= hostdata
->connected
->SCp
.phase
;
1124 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
1125 (BASR_PHASE_MATCH
|BASR_ACK
)) ==
1126 (BASR_PHASE_MATCH
|BASR_ACK
)) {
1127 saved_data
= NCR5380_read(INPUT_DATA_REG
);
1129 dprintk(NDEBUG_DMA
, "scsi%d: read overrun handled\n", HOSTNO
);
1134 dprintk(NDEBUG_DMA
, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1135 HOSTNO
, NCR5380_read(BUS_AND_STATUS_REG
),
1136 NCR5380_read(STATUS_REG
));
1138 #if defined(CONFIG_SUN3)
1139 if ((sun3scsi_dma_finish(rq_data_dir(hostdata
->connected
->request
)))) {
1140 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
1145 /* make sure we're not stuck in a data phase */
1146 if ((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
1147 (BASR_PHASE_MATCH
| BASR_ACK
)) {
1148 pr_err("scsi%d: BASR %02x\n", instance
->host_no
,
1149 NCR5380_read(BUS_AND_STATUS_REG
));
1150 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
1156 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1157 NCR5380_write(MODE_REG
, MR_BASE
);
1158 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1160 transferred
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1161 hostdata
->dma_len
= 0;
1163 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
1164 count
= &hostdata
->connected
->SCp
.this_residual
;
1165 *data
+= transferred
;
1166 *count
-= transferred
;
1168 if (hostdata
->read_overruns
) {
1171 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
1172 cnt
= toPIO
= hostdata
->read_overruns
;
1174 dprintk(NDEBUG_DMA
, "Got an input overrun, using saved byte\n");
1175 *(*data
)++ = saved_data
;
1180 dprintk(NDEBUG_DMA
, "Doing %d-byte PIO to 0x%08lx\n", cnt
, (long)*data
);
1181 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
);
1182 *count
-= toPIO
- cnt
;
1186 #endif /* REAL_DMA */
1190 * NCR5380_intr - generic NCR5380 irq handler
1191 * @irq: interrupt number
1192 * @dev_id: device info
1194 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1195 * from the disconnected queue, and restarting NCR5380_main()
1199 static irqreturn_t
NCR5380_intr(int irq
, void *dev_id
)
1201 struct Scsi_Host
*instance
= dev_id
;
1202 int done
= 1, handled
= 0;
1205 dprintk(NDEBUG_INTR
, "scsi%d: NCR5380 irq triggered\n", HOSTNO
);
1207 /* Look for pending interrupts */
1208 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1209 dprintk(NDEBUG_INTR
, "scsi%d: BASR=%02x\n", HOSTNO
, basr
);
1210 /* dispatch to appropriate routine if found and done=0 */
1211 if (basr
& BASR_IRQ
) {
1212 NCR5380_dprint(NDEBUG_INTR
, instance
);
1213 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
|SR_IO
)) == (SR_SEL
|SR_IO
)) {
1215 dprintk(NDEBUG_INTR
, "scsi%d: SEL interrupt\n", HOSTNO
);
1216 NCR5380_reselect(instance
);
1217 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1218 } else if (basr
& BASR_PARITY_ERROR
) {
1219 dprintk(NDEBUG_INTR
, "scsi%d: PARITY interrupt\n", HOSTNO
);
1220 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1221 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1222 dprintk(NDEBUG_INTR
, "scsi%d: RESET interrupt\n", HOSTNO
);
1223 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1226 * The rest of the interrupt conditions can occur only during a
1230 #if defined(REAL_DMA)
1232 * We should only get PHASE MISMATCH and EOP interrupts if we have
1233 * DMA enabled, so do a sanity check based on the current setting
1234 * of the MODE register.
1237 if ((NCR5380_read(MODE_REG
) & MR_DMA_MODE
) &&
1238 ((basr
& BASR_END_DMA_TRANSFER
) ||
1239 !(basr
& BASR_PHASE_MATCH
))) {
1241 dprintk(NDEBUG_INTR
, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO
);
1242 NCR5380_dma_complete( instance
);
1245 #endif /* REAL_DMA */
1247 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1248 if (basr
& BASR_PHASE_MATCH
)
1249 dprintk(NDEBUG_INTR
, "scsi%d: unknown interrupt, "
1250 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1251 HOSTNO
, basr
, NCR5380_read(MODE_REG
),
1252 NCR5380_read(STATUS_REG
));
1253 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1254 #ifdef SUN3_SCSI_VME
1255 dregs
->csr
|= CSR_DMA_ENABLE
;
1258 } /* if !(SELECTION || PARITY) */
1260 } /* BASR & IRQ */ else {
1261 printk(KERN_NOTICE
"scsi%d: interrupt without IRQ bit set in BASR, "
1262 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO
, basr
,
1263 NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1264 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1265 #ifdef SUN3_SCSI_VME
1266 dregs
->csr
|= CSR_DMA_ENABLE
;
1271 dprintk(NDEBUG_INTR
, "scsi%d: in int routine, calling main\n", HOSTNO
);
1272 /* Put a call to NCR5380_main() on the queue... */
1273 queue_main(shost_priv(instance
));
1275 return IRQ_RETVAL(handled
);
1279 * Function : int NCR5380_select(struct Scsi_Host *instance,
1280 * struct scsi_cmnd *cmd)
1282 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1283 * including ARBITRATION, SELECTION, and initial message out for
1284 * IDENTIFY and queue messages.
1286 * Inputs : instance - instantiation of the 5380 driver on which this
1287 * target lives, cmd - SCSI command to execute.
1289 * Returns : -1 if selection could not execute for some reason,
1290 * 0 if selection succeeded or failed because the target
1294 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1295 * with registers as they should have been on entry - ie
1296 * SELECT_ENABLE will be set appropriately, the NCR5380
1297 * will cease to drive any SCSI bus signals.
1299 * If successful : I_T_L or I_T_L_Q nexus will be established,
1300 * instance->connected will be set to cmd.
1301 * SELECT interrupt will be disabled.
1303 * If failed (no target) : cmd->scsi_done() will be called, and the
1304 * cmd->result host byte set to DID_BAD_TARGET.
1307 static int NCR5380_select(struct Scsi_Host
*instance
, struct scsi_cmnd
*cmd
)
1309 SETUP_HOSTDATA(instance
);
1310 unsigned char tmp
[3], phase
;
1311 unsigned char *data
;
1313 unsigned long timeout
;
1314 unsigned long flags
;
1316 hostdata
->restart_select
= 0;
1317 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
1318 dprintk(NDEBUG_ARBITRATION
, "scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1322 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1323 * data bus during SELECTION.
1326 local_irq_save(flags
);
1327 if (hostdata
->connected
) {
1328 local_irq_restore(flags
);
1331 NCR5380_write(TARGET_COMMAND_REG
, 0);
1334 * Start arbitration.
1337 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1338 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1340 local_irq_restore(flags
);
1342 /* Wait for arbitration logic to complete */
1343 #if defined(NCR_TIMEOUT)
1345 unsigned long timeout
= jiffies
+ 2*NCR_TIMEOUT
;
1347 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1348 time_before(jiffies
, timeout
) && !hostdata
->connected
)
1350 if (time_after_eq(jiffies
, timeout
)) {
1351 printk("scsi : arbitration timeout at %d\n", __LINE__
);
1352 NCR5380_write(MODE_REG
, MR_BASE
);
1353 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1357 #else /* NCR_TIMEOUT */
1358 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1359 !hostdata
->connected
)
1363 dprintk(NDEBUG_ARBITRATION
, "scsi%d: arbitration complete\n", HOSTNO
);
1365 if (hostdata
->connected
) {
1366 NCR5380_write(MODE_REG
, MR_BASE
);
1370 * The arbitration delay is 2.2us, but this is a minimum and there is
1371 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1372 * the integral nature of udelay().
1378 /* Check for lost arbitration */
1379 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1380 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1381 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1382 hostdata
->connected
) {
1383 NCR5380_write(MODE_REG
, MR_BASE
);
1384 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1389 /* after/during arbitration, BSY should be asserted.
1390 IBM DPES-31080 Version S31Q works now */
1391 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1392 NCR5380_write(INITIATOR_COMMAND_REG
,
1393 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1395 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1396 hostdata
->connected
) {
1397 NCR5380_write(MODE_REG
, MR_BASE
);
1398 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1399 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1405 * Again, bus clear + bus settle time is 1.2us, however, this is
1406 * a minimum so we'll udelay ceil(1.2)
1409 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1410 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1416 if (hostdata
->connected
) {
1417 NCR5380_write(MODE_REG
, MR_BASE
);
1418 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1422 dprintk(NDEBUG_ARBITRATION
, "scsi%d: won arbitration\n", HOSTNO
);
1425 * Now that we have won arbitration, start Selection process, asserting
1426 * the host and target ID's on the SCSI bus.
1429 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1432 * Raise ATN while SEL is true before BSY goes false from arbitration,
1433 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1434 * phase immediately after selection.
1437 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1438 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1439 NCR5380_write(MODE_REG
, MR_BASE
);
1442 * Reselect interrupts must be turned off prior to the dropping of BSY,
1443 * otherwise we will trigger an interrupt.
1446 if (hostdata
->connected
) {
1447 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1451 NCR5380_write(SELECT_ENABLE_REG
, 0);
1454 * The initiator shall then wait at least two deskew delays and release
1457 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1460 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1461 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1464 * Something weird happens when we cease to drive BSY - looks
1465 * like the board/chip is letting us do another read before the
1466 * appropriate propagation delay has expired, and we're confusing
1467 * a BSY signal from ourselves as the target's response to SELECTION.
1469 * A small delay (the 'C++' frontend breaks the pipeline with an
1470 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1471 * tighter 'C' code breaks and requires this) solves the problem -
1472 * the 1 us delay is arbitrary, and only used because this delay will
1473 * be the same on other platforms and since it works here, it should
1476 * wingel suggests that this could be due to failing to wait
1482 dprintk(NDEBUG_SELECTION
, "scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1485 * The SCSI specification calls for a 250 ms timeout for the actual
1489 timeout
= jiffies
+ msecs_to_jiffies(250);
1492 * XXX very interesting - we're seeing a bounce where the BSY we
1493 * asserted is being reflected / still asserted (propagation delay?)
1494 * and it's detecting as true. Sigh.
1498 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1499 * IO while SEL is true. But again, there are some disks out the in the
1500 * world that do that nevertheless. (Somebody claimed that this announces
1501 * reselection capability of the target.) So we better skip that test and
1502 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1505 while (time_before(jiffies
, timeout
) &&
1506 !(NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_IO
)))
1509 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1510 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1511 NCR5380_reselect(instance
);
1512 printk(KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1514 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1518 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) & SR_BSY
))
1523 * No less than two deskew delays after the initiator detects the
1524 * BSY signal is true, it shall release the SEL signal and may
1525 * change the DATA BUS. -wingel
1530 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1532 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1533 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1534 if (hostdata
->targets_present
& (1 << cmd
->device
->id
)) {
1535 printk(KERN_ERR
"scsi%d: weirdness\n", HOSTNO
);
1536 if (hostdata
->restart_select
)
1537 printk(KERN_NOTICE
"\trestart select\n");
1538 NCR5380_dprint(NDEBUG_ANY
, instance
);
1539 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1542 cmd
->result
= DID_BAD_TARGET
<< 16;
1546 cmd
->scsi_done(cmd
);
1547 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1548 dprintk(NDEBUG_SELECTION
, "scsi%d: target did not respond within 250ms\n", HOSTNO
);
1549 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1553 hostdata
->targets_present
|= (1 << cmd
->device
->id
);
1556 * Since we followed the SCSI spec, and raised ATN while SEL
1557 * was true but before BSY was false during selection, the information
1558 * transfer phase should be a MESSAGE OUT phase so that we can send the
1561 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1562 * message (2 bytes) with a tag ID that we increment with every command
1563 * until it wraps back to 0.
1565 * XXX - it turns out that there are some broken SCSI-II devices,
1566 * which claim to support tagged queuing but fail when more than
1567 * some number of commands are issued at once.
1570 /* Wait for start of REQ/ACK handshake */
1571 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
1574 dprintk(NDEBUG_SELECTION
, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1575 HOSTNO
, cmd
->device
->id
);
1576 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1579 if (cmd
->tag
!= TAG_NONE
) {
1580 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1588 #endif /* SUPPORT_TAGS */
1590 /* Send message(s) */
1592 phase
= PHASE_MSGOUT
;
1593 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1594 dprintk(NDEBUG_SELECTION
, "scsi%d: nexus established.\n", HOSTNO
);
1595 /* XXX need to handle errors here */
1596 hostdata
->connected
= cmd
;
1597 #ifndef SUPPORT_TAGS
1598 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1600 #ifdef SUN3_SCSI_VME
1601 dregs
->csr
|= CSR_INTR
;
1604 initialize_SCp(cmd
);
1610 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1611 * unsigned char *phase, int *count, unsigned char **data)
1613 * Purpose : transfers data in given phase using polled I/O
1615 * Inputs : instance - instance of driver, *phase - pointer to
1616 * what phase is expected, *count - pointer to number of
1617 * bytes to transfer, **data - pointer to data pointer.
1619 * Returns : -1 when different phase is entered without transferring
1620 * maximum number of bytes, 0 if all bytes are transferred or exit
1623 * Also, *phase, *count, *data are modified in place.
1625 * XXX Note : handling for bus free may be useful.
1629 * Note : this code is not as quick as it could be, however it
1630 * IS 100% reliable, and for the actual data transfer where speed
1631 * counts, we will always do a pseudo DMA or DMA transfer.
1634 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1635 unsigned char *phase
, int *count
,
1636 unsigned char **data
)
1638 register unsigned char p
= *phase
, tmp
;
1639 register int c
= *count
;
1640 register unsigned char *d
= *data
;
1643 * The NCR5380 chip will only drive the SCSI bus when the
1644 * phase specified in the appropriate bits of the TARGET COMMAND
1645 * REGISTER match the STATUS REGISTER
1648 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1652 * Wait for assertion of REQ, after which the phase bits will be
1655 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
))
1658 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: REQ detected\n", HOSTNO
);
1660 /* Check for phase mismatch */
1661 if ((tmp
& 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 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1703 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: req false, handshake complete\n", HOSTNO
);
1706 * We have several special cases to consider during REQ/ACK handshaking :
1707 * 1. We were in MSGOUT phase, and we are on the last byte of the
1708 * message. ATN must be dropped as ACK is dropped.
1710 * 2. We are in a MSGIN phase, and we are on the last byte of the
1711 * message. We must exit with ACK asserted, so that the calling
1712 * code may raise ATN before dropping ACK to reject the message.
1714 * 3. ACK and ATN are clear and the target may proceed as normal.
1716 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1717 if (p
== PHASE_MSGOUT
&& c
> 1)
1718 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1720 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1724 dprintk(NDEBUG_PIO
, "scsi%d: residual %d\n", HOSTNO
, c
);
1728 tmp
= NCR5380_read(STATUS_REG
);
1729 /* The phase read from the bus is valid if either REQ is (already)
1730 * asserted or if ACK hasn't been released yet. The latter is the case if
1731 * we're in MSGIN and all wanted bytes have been received.
1733 if ((tmp
& SR_REQ
) || (p
== PHASE_MSGIN
&& c
== 0))
1734 *phase
= tmp
& PHASE_MASK
;
1736 *phase
= PHASE_UNKNOWN
;
1738 if (!c
|| (*phase
== p
))
1745 * Function : do_abort (Scsi_Host *host)
1747 * Purpose : abort the currently established nexus. Should only be
1748 * called from a routine which can drop into a
1750 * Returns : 0 on success, -1 on failure.
1753 static int do_abort(struct Scsi_Host
*instance
)
1755 unsigned char tmp
, *msgptr
, phase
;
1758 /* Request message out phase */
1759 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1762 * Wait for the target to indicate a valid phase by asserting
1763 * REQ. Once this happens, we'll have either a MSGOUT phase
1764 * and can immediately send the ABORT message, or we'll have some
1765 * other phase and will have to source/sink data.
1767 * We really don't care what value was on the bus or what value
1768 * the target sees, so we just handshake.
1771 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
))
1774 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1776 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
1777 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1779 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1781 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1787 phase
= PHASE_MSGOUT
;
1788 NCR5380_transfer_pio(instance
, &phase
, &len
, &msgptr
);
1791 * If we got here, and the command completed successfully,
1792 * we're about to go into bus free state.
1795 return len
? -1 : 0;
1798 #if defined(REAL_DMA)
1800 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1801 * unsigned char *phase, int *count, unsigned char **data)
1803 * Purpose : transfers data in given phase using either real
1806 * Inputs : instance - instance of driver, *phase - pointer to
1807 * what phase is expected, *count - pointer to number of
1808 * bytes to transfer, **data - pointer to data pointer.
1810 * Returns : -1 when different phase is entered without transferring
1811 * maximum number of bytes, 0 if all bytes or transferred or exit
1814 * Also, *phase, *count, *data are modified in place.
1819 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1820 unsigned char *phase
, int *count
,
1821 unsigned char **data
)
1823 SETUP_HOSTDATA(instance
);
1824 register int c
= *count
;
1825 register unsigned char p
= *phase
;
1826 unsigned long flags
;
1828 #if defined(CONFIG_SUN3)
1830 if (!sun3_dma_setup_done
) {
1831 pr_err("scsi%d: transfer_dma without setup!\n",
1835 hostdata
->dma_len
= c
;
1837 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1838 instance
->host_no
, (p
& SR_IO
) ? "reading" : "writing",
1839 c
, (p
& SR_IO
) ? "to" : "from", *data
);
1841 /* netbsd turns off ints here, why not be safe and do it too */
1842 local_irq_save(flags
);
1844 /* send start chain */
1845 sun3scsi_dma_start(c
, *data
);
1848 NCR5380_write(TARGET_COMMAND_REG
, 1);
1849 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1850 NCR5380_write(INITIATOR_COMMAND_REG
, 0);
1851 NCR5380_write(MODE_REG
,
1852 (NCR5380_read(MODE_REG
) | MR_DMA_MODE
| MR_ENABLE_EOP_INTR
));
1853 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1855 NCR5380_write(TARGET_COMMAND_REG
, 0);
1856 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1857 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_DATA
);
1858 NCR5380_write(MODE_REG
,
1859 (NCR5380_read(MODE_REG
) | MR_DMA_MODE
| MR_ENABLE_EOP_INTR
));
1860 NCR5380_write(START_DMA_SEND_REG
, 0);
1863 #ifdef SUN3_SCSI_VME
1864 dregs
->csr
|= CSR_DMA_ENABLE
;
1867 local_irq_restore(flags
);
1869 sun3_dma_active
= 1;
1871 #else /* !defined(CONFIG_SUN3) */
1872 register unsigned char *d
= *data
;
1875 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1880 if (hostdata
->read_overruns
&& (p
& SR_IO
))
1881 c
-= hostdata
->read_overruns
;
1883 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1884 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1885 c
, (p
& SR_IO
) ? "to" : "from", d
);
1887 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1890 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
1891 #endif /* def REAL_DMA */
1893 if (!(hostdata
->flags
& FLAG_LATE_DMA_SETUP
)) {
1894 /* On the Medusa, it is a must to initialize the DMA before
1895 * starting the NCR. This is also the cleaner way for the TT.
1897 local_irq_save(flags
);
1898 hostdata
->dma_len
= (p
& SR_IO
) ?
1899 NCR5380_dma_read_setup(instance
, d
, c
) :
1900 NCR5380_dma_write_setup(instance
, d
, c
);
1901 local_irq_restore(flags
);
1905 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1907 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1908 NCR5380_write(START_DMA_SEND_REG
, 0);
1911 if (hostdata
->flags
& FLAG_LATE_DMA_SETUP
) {
1912 /* On the Falcon, the DMA setup must be done after the last */
1913 /* NCR access, else the DMA setup gets trashed!
1915 local_irq_save(flags
);
1916 hostdata
->dma_len
= (p
& SR_IO
) ?
1917 NCR5380_dma_read_setup(instance
, d
, c
) :
1918 NCR5380_dma_write_setup(instance
, d
, c
);
1919 local_irq_restore(flags
);
1921 #endif /* !defined(CONFIG_SUN3) */
1925 #endif /* defined(REAL_DMA) */
1928 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1930 * Purpose : run through the various SCSI phases and do as the target
1931 * directs us to. Operates on the currently connected command,
1932 * instance->connected.
1934 * Inputs : instance, instance for which we are doing commands
1936 * Side effects : SCSI things happen, the disconnected queue will be
1937 * modified if a command disconnects, *instance->connected will
1940 * XXX Note : we need to watch for bus free or a reset condition here
1941 * to recover from an unexpected bus free condition.
1944 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
1946 SETUP_HOSTDATA(instance
);
1947 unsigned long flags
;
1948 unsigned char msgout
= NOP
;
1951 #if defined(REAL_DMA)
1954 unsigned char *data
;
1955 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
1956 struct scsi_cmnd
*cmd
= (struct scsi_cmnd
*) hostdata
->connected
;
1958 #ifdef SUN3_SCSI_VME
1959 dregs
->csr
|= CSR_INTR
;
1963 tmp
= NCR5380_read(STATUS_REG
);
1964 /* We only have a valid SCSI phase when REQ is asserted */
1966 phase
= (tmp
& PHASE_MASK
);
1967 if (phase
!= old_phase
) {
1969 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
1971 #if defined(CONFIG_SUN3)
1972 if (phase
== PHASE_CMDOUT
) {
1973 #if defined(REAL_DMA)
1975 unsigned long count
;
1977 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
1978 count
= cmd
->SCp
.buffer
->length
;
1979 d
= sg_virt(cmd
->SCp
.buffer
);
1981 count
= cmd
->SCp
.this_residual
;
1984 /* this command setup for dma yet? */
1985 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= cmd
)) {
1986 if (cmd
->request
->cmd_type
== REQ_TYPE_FS
) {
1987 sun3scsi_dma_setup(d
, count
,
1988 rq_data_dir(cmd
->request
));
1989 sun3_dma_setup_done
= cmd
;
1993 #ifdef SUN3_SCSI_VME
1994 dregs
->csr
|= CSR_INTR
;
1997 #endif /* CONFIG_SUN3 */
1999 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2000 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2002 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2004 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
2006 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2014 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2015 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2016 "aborted\n", HOSTNO
);
2019 cmd
->result
= DID_ERROR
<< 16;
2020 cmd
->scsi_done(cmd
);
2025 * If there is no room left in the current buffer in the
2026 * scatter-gather list, move onto the next one.
2029 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2031 --cmd
->SCp
.buffers_residual
;
2032 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2033 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
2034 /* ++roman: Try to merge some scatter-buffers if
2035 * they are at contiguous physical addresses.
2037 merge_contiguous_buffers(cmd
);
2038 dprintk(NDEBUG_INFORMATION
, "scsi%d: %d bytes and %d buffers left\n",
2039 HOSTNO
, cmd
->SCp
.this_residual
,
2040 cmd
->SCp
.buffers_residual
);
2044 * The preferred transfer method is going to be
2045 * PSEUDO-DMA for systems that are strictly PIO,
2046 * since we can let the hardware do the handshaking.
2048 * For this to work, we need to know the transfersize
2049 * ahead of time, since the pseudo-DMA code will sit
2050 * in an unconditional loop.
2053 /* ++roman: I suggest, this should be
2055 * instead of leaving REAL_DMA out.
2058 #if defined(REAL_DMA)
2060 #if !defined(CONFIG_SUN3)
2061 !cmd
->device
->borken
&&
2063 (transfersize
= NCR5380_dma_xfer_len(instance
, cmd
, phase
)) >= DMA_MIN_SIZE
) {
2065 cmd
->SCp
.phase
= phase
;
2066 if (NCR5380_transfer_dma(instance
, &phase
,
2067 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
2069 * If the watchdog timer fires, all future
2070 * accesses to this device will use the
2072 scmd_printk(KERN_INFO
, cmd
,
2073 "switching to slow handshake\n");
2074 cmd
->device
->borken
= 1;
2075 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2079 cmd
->result
= DID_ERROR
<< 16;
2080 cmd
->scsi_done(cmd
);
2081 /* XXX - need to source or sink data here, as appropriate */
2084 /* ++roman: When using real DMA,
2085 * information_transfer() should return after
2086 * starting DMA since it has nothing more to
2091 cmd
->SCp
.this_residual
-= transfersize
- len
;
2095 #endif /* defined(REAL_DMA) */
2096 NCR5380_transfer_pio(instance
, &phase
,
2097 (int *)&cmd
->SCp
.this_residual
,
2098 (unsigned char **)&cmd
->SCp
.ptr
);
2099 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2100 /* if we had intended to dma that command clear it */
2101 if (sun3_dma_setup_done
== cmd
)
2102 sun3_dma_setup_done
= NULL
;
2108 NCR5380_write(SELECT_ENABLE_REG
, 0); /* disable reselects */
2109 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2110 cmd
->SCp
.Message
= tmp
;
2114 * Linking lets us reduce the time required to get the
2115 * next command out to the device, hopefully this will
2116 * mean we don't waste another revolution due to the delays
2117 * required by ARBITRATION and another SELECTION.
2119 * In the current implementation proposal, low level drivers
2120 * merely have to start the next command, pointed to by
2121 * next_link, done() is called as with unlinked commands.
2124 case LINKED_CMD_COMPLETE
:
2125 case LINKED_FLG_CMD_COMPLETE
:
2126 /* Accept message by clearing ACK */
2127 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2129 dprintk(NDEBUG_LINKED
, "scsi%d: target %d lun %llu linked command "
2130 "complete.\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2132 /* Enable reselect interrupts */
2133 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2135 * Sanity check : A linked command should only terminate
2136 * with one of these messages if there are more linked
2137 * commands available.
2140 if (!cmd
->next_link
) {
2141 printk(KERN_NOTICE
"scsi%d: target %d lun %llu "
2142 "linked command complete, no next_link\n",
2143 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2149 initialize_SCp(cmd
->next_link
);
2150 /* The next command is still part of this process; copy it
2151 * and don't free it! */
2152 cmd
->next_link
->tag
= cmd
->tag
;
2153 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2154 dprintk(NDEBUG_LINKED
, "scsi%d: target %d lun %llu linked request "
2155 "done, calling scsi_done().\n",
2156 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2157 cmd
->scsi_done(cmd
);
2158 cmd
= hostdata
->connected
;
2160 #endif /* def LINKED */
2162 case COMMAND_COMPLETE
:
2163 /* Accept message by clearing ACK */
2164 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2165 dprintk(NDEBUG_QUEUES
, "scsi%d: command for target %d, lun %llu "
2166 "completed\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2168 local_irq_save(flags
);
2169 hostdata
->retain_dma_intr
++;
2170 hostdata
->connected
= NULL
;
2173 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2174 /* Turn a QUEUE FULL status into BUSY, I think the
2175 * mid level cannot handle QUEUE FULL :-( (The
2176 * command is retried after BUSY). Also update our
2177 * queue size to the number of currently issued
2180 /* ++Andreas: the mid level code knows about
2182 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][cmd
->device
->lun
];
2183 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu returned "
2184 "QUEUE_FULL after %d commands\n",
2185 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2187 if (ta
->queue_size
> ta
->nr_allocated
)
2188 ta
->nr_allocated
= ta
->queue_size
;
2191 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2193 /* Enable reselect interrupts */
2194 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2197 * I'm not sure what the correct thing to do here is :
2199 * If the command that just executed is NOT a request
2200 * sense, the obvious thing to do is to set the result
2201 * code to the values of the stored parameters.
2203 * If it was a REQUEST SENSE command, we need some way to
2204 * differentiate between the failure code of the original
2205 * and the failure code of the REQUEST sense - the obvious
2206 * case is success, where we fall through and leave the
2207 * result code unchanged.
2209 * The non-obvious place is where the REQUEST SENSE failed
2212 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2213 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2214 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2215 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2217 if ((cmd
->cmnd
[0] == REQUEST_SENSE
) &&
2218 hostdata
->ses
.cmd_len
) {
2219 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
2220 hostdata
->ses
.cmd_len
= 0 ;
2223 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2224 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2225 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
2227 dprintk(NDEBUG_AUTOSENSE
, "scsi%d: performing request sense\n", HOSTNO
);
2229 LIST(cmd
,hostdata
->issue_queue
);
2230 SET_NEXT(cmd
, hostdata
->issue_queue
);
2231 hostdata
->issue_queue
= (struct scsi_cmnd
*) cmd
;
2232 dprintk(NDEBUG_QUEUES
, "scsi%d: REQUEST SENSE added to head of "
2233 "issue queue\n", H_NO(cmd
));
2235 cmd
->scsi_done(cmd
);
2238 local_irq_restore(flags
);
2240 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2242 * Restore phase bits to 0 so an interrupted selection,
2243 * arbitration can resume.
2245 NCR5380_write(TARGET_COMMAND_REG
, 0);
2247 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2250 local_irq_save(flags
);
2251 hostdata
->retain_dma_intr
--;
2252 /* ++roman: For Falcon SCSI, release the lock on the
2253 * ST-DMA here if no other commands are waiting on the
2254 * disconnected queue.
2256 maybe_release_dma_irq(instance
);
2257 local_irq_restore(flags
);
2259 case MESSAGE_REJECT
:
2260 /* Accept message by clearing ACK */
2261 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2262 /* Enable reselect interrupts */
2263 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2264 switch (hostdata
->last_message
) {
2265 case HEAD_OF_QUEUE_TAG
:
2266 case ORDERED_QUEUE_TAG
:
2267 case SIMPLE_QUEUE_TAG
:
2268 /* The target obviously doesn't support tagged
2269 * queuing, even though it announced this ability in
2270 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2271 * clear 'tagged_supported' and lock the LUN, since
2272 * the command is treated as untagged further on.
2274 cmd
->device
->tagged_supported
= 0;
2275 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2276 cmd
->tag
= TAG_NONE
;
2277 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu rejected "
2278 "QUEUE_TAG message; tagged queuing "
2280 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2285 /* Accept message by clearing ACK */
2286 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2287 local_irq_save(flags
);
2288 cmd
->device
->disconnect
= 1;
2289 LIST(cmd
,hostdata
->disconnected_queue
);
2290 SET_NEXT(cmd
, hostdata
->disconnected_queue
);
2291 hostdata
->connected
= NULL
;
2292 hostdata
->disconnected_queue
= cmd
;
2293 local_irq_restore(flags
);
2294 dprintk(NDEBUG_QUEUES
, "scsi%d: command for target %d lun %llu was "
2295 "moved from connected to the "
2296 "disconnected_queue\n", HOSTNO
,
2297 cmd
->device
->id
, cmd
->device
->lun
);
2299 * Restore phase bits to 0 so an interrupted selection,
2300 * arbitration can resume.
2302 NCR5380_write(TARGET_COMMAND_REG
, 0);
2304 /* Enable reselect interrupts */
2305 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2306 /* Wait for bus free to avoid nasty timeouts */
2307 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2309 #ifdef SUN3_SCSI_VME
2310 dregs
->csr
|= CSR_DMA_ENABLE
;
2314 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2315 * operation, in violation of the SCSI spec so we can safely
2316 * ignore SAVE/RESTORE pointers calls.
2318 * Unfortunately, some disks violate the SCSI spec and
2319 * don't issue the required SAVE_POINTERS message before
2320 * disconnecting, and we have to break spec to remain
2324 case RESTORE_POINTERS
:
2325 /* Accept message by clearing ACK */
2326 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2327 /* Enable reselect interrupts */
2328 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2330 case EXTENDED_MESSAGE
:
2332 * Extended messages are sent in the following format :
2334 * 0 EXTENDED_MESSAGE == 1
2335 * 1 length (includes one byte for code, doesn't
2336 * include first two bytes)
2338 * 3..length+1 arguments
2340 * Start the extended message buffer with the EXTENDED_MESSAGE
2341 * byte, since spi_print_msg() wants the whole thing.
2343 extended_msg
[0] = EXTENDED_MESSAGE
;
2344 /* Accept first byte by clearing ACK */
2345 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2347 dprintk(NDEBUG_EXTENDED
, "scsi%d: receiving extended message\n", HOSTNO
);
2350 data
= extended_msg
+ 1;
2351 phase
= PHASE_MSGIN
;
2352 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2353 dprintk(NDEBUG_EXTENDED
, "scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2354 (int)extended_msg
[1], (int)extended_msg
[2]);
2356 if (!len
&& extended_msg
[1] <=
2357 (sizeof(extended_msg
) - 1)) {
2358 /* Accept third byte by clearing ACK */
2359 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2360 len
= extended_msg
[1] - 1;
2361 data
= extended_msg
+ 3;
2362 phase
= PHASE_MSGIN
;
2364 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2365 dprintk(NDEBUG_EXTENDED
, "scsi%d: message received, residual %d\n",
2368 switch (extended_msg
[2]) {
2371 case EXTENDED_MODIFY_DATA_POINTER
:
2372 case EXTENDED_EXTENDED_IDENTIFY
:
2376 printk(KERN_NOTICE
"scsi%d: error receiving "
2377 "extended message\n", HOSTNO
);
2380 printk(KERN_NOTICE
"scsi%d: extended message "
2381 "code %02x length %d is too long\n",
2382 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2385 /* Fall through to reject message */
2388 * If we get something weird that we aren't expecting,
2393 printk(KERN_INFO
"scsi%d: rejecting message ",
2395 spi_print_msg(extended_msg
);
2397 } else if (tmp
!= EXTENDED_MESSAGE
)
2398 scmd_printk(KERN_INFO
, cmd
,
2399 "rejecting unknown message %02x\n",
2402 scmd_printk(KERN_INFO
, cmd
,
2403 "rejecting unknown extended message code %02x, length %d\n",
2404 extended_msg
[1], extended_msg
[0]);
2406 msgout
= MESSAGE_REJECT
;
2407 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2409 } /* switch (tmp) */
2414 hostdata
->last_message
= msgout
;
2415 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2416 if (msgout
== ABORT
) {
2417 local_irq_save(flags
);
2421 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2423 hostdata
->connected
= NULL
;
2424 cmd
->result
= DID_ERROR
<< 16;
2425 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2426 maybe_release_dma_irq(instance
);
2427 local_irq_restore(flags
);
2428 cmd
->scsi_done(cmd
);
2437 * XXX for performance reasons, on machines with a
2438 * PSEUDO-DMA architecture we should probably
2439 * use the dma transfer function.
2441 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2446 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2447 cmd
->SCp
.Status
= tmp
;
2450 printk("scsi%d: unknown phase\n", HOSTNO
);
2451 NCR5380_dprint(NDEBUG_ANY
, instance
);
2452 } /* switch(phase) */
2453 } /* if (tmp * SR_REQ) */
2458 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2460 * Purpose : does reselection, initializing the instance->connected
2461 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2462 * nexus has been reestablished,
2464 * Inputs : instance - this instance of the NCR5380.
2469 /* it might eventually prove necessary to do a dma setup on
2470 reselection, but it doesn't seem to be needed now -- sam */
2472 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2474 SETUP_HOSTDATA(instance
);
2475 unsigned char target_mask
;
2480 unsigned char msg
[3];
2481 int __maybe_unused len
;
2482 unsigned char __maybe_unused
*data
, __maybe_unused phase
;
2483 struct scsi_cmnd
*tmp
= NULL
, *prev
;
2486 * Disable arbitration, etc. since the host adapter obviously
2487 * lost, and tell an interrupted NCR5380_select() to restart.
2490 NCR5380_write(MODE_REG
, MR_BASE
);
2491 hostdata
->restart_select
= 1;
2493 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2495 dprintk(NDEBUG_RESELECTION
, "scsi%d: reselect\n", HOSTNO
);
2498 * At this point, we have detected that our SCSI ID is on the bus,
2499 * SEL is true and BSY was false for at least one bus settle delay
2502 * We must assert BSY ourselves, until the target drops the SEL
2506 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2508 while (NCR5380_read(STATUS_REG
) & SR_SEL
)
2510 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2513 * Wait for target to go into MSGIN.
2516 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
2519 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2520 /* acknowledge toggle to MSGIN */
2521 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(PHASE_MSGIN
));
2523 /* peek at the byte without really hitting the bus */
2524 msg
[0] = NCR5380_read(CURRENT_SCSI_DATA_REG
);
2528 phase
= PHASE_MSGIN
;
2529 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2532 if (!(msg
[0] & 0x80)) {
2533 printk(KERN_DEBUG
"scsi%d: expecting IDENTIFY message, got ", HOSTNO
);
2538 lun
= (msg
[0] & 0x07);
2540 #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
2541 /* If the phase is still MSGIN, the target wants to send some more
2542 * messages. In case it supports tagged queuing, this is probably a
2543 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2546 if (phase
== PHASE_MSGIN
&& (hostdata
->flags
& FLAG_TAGGED_QUEUING
)) {
2547 /* Accept previous IDENTIFY message by clearing ACK */
2548 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2551 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2552 msg
[1] == SIMPLE_QUEUE_TAG
)
2554 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at "
2555 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2560 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2561 * just reestablished, and remove it from the disconnected queue.
2564 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2565 tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
2566 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== tmp
->device
->lun
)
2568 && (tag
== tmp
->tag
)
2572 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
2573 SET_NEXT(prev
, NEXT(tmp
));
2575 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, NEXT(tmp
));
2576 hostdata
->disconnected_queue
= NEXT(tmp
);
2578 SET_NEXT(tmp
, NULL
);
2584 printk(KERN_WARNING
"scsi%d: warning: target bitmask %02x lun %d "
2588 "not in disconnected_queue.\n",
2589 HOSTNO
, target_mask
, lun
2595 * Since we have an established nexus that we can't do anything
2596 * with, we must abort it.
2602 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2603 /* engage dma setup for the command we just saw */
2606 unsigned long count
;
2608 if (!tmp
->SCp
.this_residual
&& tmp
->SCp
.buffers_residual
) {
2609 count
= tmp
->SCp
.buffer
->length
;
2610 d
= sg_virt(tmp
->SCp
.buffer
);
2612 count
= tmp
->SCp
.this_residual
;
2615 /* setup this command for dma if not already */
2616 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= tmp
)) {
2617 sun3scsi_dma_setup(d
, count
, rq_data_dir(tmp
->request
));
2618 sun3_dma_setup_done
= tmp
;
2622 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2625 /* Accept message by clearing ACK */
2626 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2628 #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
2629 /* If the phase is still MSGIN, the target wants to send some more
2630 * messages. In case it supports tagged queuing, this is probably a
2631 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2634 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2635 /* Accept previous IDENTIFY message by clearing ACK */
2636 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2639 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2640 msg
[1] == SIMPLE_QUEUE_TAG
)
2642 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n"
2643 HOSTNO
, target_mask
, lun
, tag
);
2647 hostdata
->connected
= tmp
;
2648 dprintk(NDEBUG_RESELECTION
, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2649 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
, tmp
->tag
);
2654 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
2656 * Purpose : abort a command
2658 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
2659 * host byte of the result field to, if zero DID_ABORTED is
2662 * Returns : SUCCESS - success, FAILED on failure.
2664 * XXX - there is no way to abort the command that is currently
2665 * connected, you have to wait for it to complete. If this is
2666 * a problem, we could implement longjmp() / setjmp(), setjmp()
2667 * called where the loop started in NCR5380_main().
2671 int NCR5380_abort(struct scsi_cmnd
*cmd
)
2673 struct Scsi_Host
*instance
= cmd
->device
->host
;
2674 SETUP_HOSTDATA(instance
);
2675 struct scsi_cmnd
*tmp
, **prev
;
2676 unsigned long flags
;
2678 scmd_printk(KERN_NOTICE
, cmd
, "aborting command\n");
2680 NCR5380_print_status(instance
);
2682 local_irq_save(flags
);
2684 dprintk(NDEBUG_ABORT
, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2685 NCR5380_read(BUS_AND_STATUS_REG
),
2686 NCR5380_read(STATUS_REG
));
2690 * Case 1 : If the command is the currently executing command,
2691 * we'll set the aborted flag and return control so that
2692 * information transfer routine can exit cleanly.
2695 if (hostdata
->connected
== cmd
) {
2697 dprintk(NDEBUG_ABORT
, "scsi%d: aborting connected command\n", HOSTNO
);
2699 * We should perform BSY checking, and make sure we haven't slipped
2703 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2705 * Since we can't change phases until we've completed the current
2706 * handshake, we have to source or sink a byte of data if the current
2707 * phase is not MSGOUT.
2711 * Return control to the executing NCR drive so we can clear the
2712 * aborted flag and get back into our main loop.
2715 if (do_abort(instance
) == 0) {
2716 hostdata
->aborted
= 1;
2717 hostdata
->connected
= NULL
;
2718 cmd
->result
= DID_ABORT
<< 16;
2722 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2724 maybe_release_dma_irq(instance
);
2725 local_irq_restore(flags
);
2726 cmd
->scsi_done(cmd
);
2729 local_irq_restore(flags
);
2730 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2737 * Case 2 : If the command hasn't been issued yet, we simply remove it
2738 * from the issue queue.
2740 for (prev
= (struct scsi_cmnd
**)&(hostdata
->issue_queue
),
2741 tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
2742 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2744 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2745 (*prev
) = NEXT(tmp
);
2746 SET_NEXT(tmp
, NULL
);
2747 tmp
->result
= DID_ABORT
<< 16;
2748 maybe_release_dma_irq(instance
);
2749 local_irq_restore(flags
);
2750 dprintk(NDEBUG_ABORT
, "scsi%d: abort removed command from issue queue.\n",
2752 /* Tagged queuing note: no tag to free here, hasn't been assigned
2754 tmp
->scsi_done(tmp
);
2760 * Case 3 : If any commands are connected, we're going to fail the abort
2761 * and let the high level SCSI driver retry at a later time or
2764 * Timeouts, and therefore aborted commands, will be highly unlikely
2765 * and handling them cleanly in this situation would make the common
2766 * case of noresets less efficient, and would pollute our code. So,
2770 if (hostdata
->connected
) {
2771 local_irq_restore(flags
);
2772 dprintk(NDEBUG_ABORT
, "scsi%d: abort failed, command connected.\n", HOSTNO
);
2777 * Case 4: If the command is currently disconnected from the bus, and
2778 * there are no connected commands, we reconnect the I_T_L or
2779 * I_T_L_Q nexus associated with it, go into message out, and send
2782 * This case is especially ugly. In order to reestablish the nexus, we
2783 * need to call NCR5380_select(). The easiest way to implement this
2784 * function was to abort if the bus was busy, and let the interrupt
2785 * handler triggered on the SEL for reselect take care of lost arbitrations
2786 * where necessary, meaning interrupts need to be enabled.
2788 * When interrupts are enabled, the queues may change - so we
2789 * can't remove it from the disconnected queue before selecting it
2790 * because that could cause a failure in hashing the nexus if that
2791 * device reselected.
2793 * Since the queues may change, we can't use the pointers from when we
2796 * So, we must first locate the command, and if NCR5380_select()
2797 * succeeds, then issue the abort, relocate the command and remove
2798 * it from the disconnected queue.
2801 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; tmp
;
2804 local_irq_restore(flags
);
2805 dprintk(NDEBUG_ABORT
, "scsi%d: aborting disconnected command.\n", HOSTNO
);
2807 if (NCR5380_select(instance
, cmd
))
2810 dprintk(NDEBUG_ABORT
, "scsi%d: nexus reestablished.\n", HOSTNO
);
2814 local_irq_save(flags
);
2815 for (prev
= (struct scsi_cmnd
**)&(hostdata
->disconnected_queue
),
2816 tmp
= (struct scsi_cmnd
*)hostdata
->disconnected_queue
;
2817 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2819 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2821 SET_NEXT(tmp
, NULL
);
2822 tmp
->result
= DID_ABORT
<< 16;
2823 /* We must unlock the tag/LUN immediately here, since the
2824 * target goes to BUS FREE and doesn't send us another
2825 * message (COMMAND_COMPLETE or the like)
2830 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2832 maybe_release_dma_irq(instance
);
2833 local_irq_restore(flags
);
2834 tmp
->scsi_done(tmp
);
2841 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2842 * possible at all) At least, we should check if the lock could be
2843 * released after the abort, in case it is kept due to some bug.
2845 maybe_release_dma_irq(instance
);
2846 local_irq_restore(flags
);
2849 * Case 5 : If we reached this point, the command was not found in any of
2852 * We probably reached this point because of an unlikely race condition
2853 * between the command completing successfully and the abortion code,
2854 * so we won't panic, but we will notify the user in case something really
2858 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO
);
2865 * Function : int NCR5380_reset (struct scsi_cmnd *cmd)
2867 * Purpose : reset the SCSI bus.
2869 * Returns : SUCCESS or FAILURE
2873 static int NCR5380_bus_reset(struct scsi_cmnd
*cmd
)
2875 struct Scsi_Host
*instance
= cmd
->device
->host
;
2876 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2878 unsigned long flags
;
2880 NCR5380_print_status(instance
);
2883 NCR5380_write(TARGET_COMMAND_REG
,
2884 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
)));
2886 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
2888 /* reset NCR registers */
2889 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2890 NCR5380_write(MODE_REG
, MR_BASE
);
2891 NCR5380_write(TARGET_COMMAND_REG
, 0);
2892 NCR5380_write(SELECT_ENABLE_REG
, 0);
2893 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2894 * through anymore ... */
2895 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
2897 /* After the reset, there are no more connected or disconnected commands
2898 * and no busy units; so clear the low-level status here to avoid
2899 * conflicts when the mid-level code tries to wake up the affected
2903 if (hostdata
->issue_queue
)
2904 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd
));
2905 if (hostdata
->connected
)
2906 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted a connected command\n", H_NO(cmd
));
2907 if (hostdata
->disconnected_queue
)
2908 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd
));
2910 local_irq_save(flags
);
2911 hostdata
->issue_queue
= NULL
;
2912 hostdata
->connected
= NULL
;
2913 hostdata
->disconnected_queue
= NULL
;
2915 free_all_tags(hostdata
);
2917 for (i
= 0; i
< 8; ++i
)
2918 hostdata
->busy
[i
] = 0;
2920 hostdata
->dma_len
= 0;
2923 maybe_release_dma_irq(instance
);
2924 local_irq_restore(flags
);