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. [...] These
130 * broken devices are the exception rather than the rule and I'd rather
131 * spend my time optimizing for the normal case.
135 * At the heart of the design is a coroutine, NCR5380_main,
136 * which is started from a workqueue for each NCR5380 host in the
137 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
138 * removing the commands from the issue queue and calling
139 * NCR5380_select() if a nexus is not established.
141 * Once a nexus is established, the NCR5380_information_transfer()
142 * phase goes through the various phases as instructed by the target.
143 * if the target goes into MSG IN and sends a DISCONNECT message,
144 * the command structure is placed into the per instance disconnected
145 * queue, and NCR5380_main tries to find more work. If the target is
146 * idle for too long, the system will try to sleep.
148 * If a command has disconnected, eventually an interrupt will trigger,
149 * calling NCR5380_intr() which will in turn call NCR5380_reselect
150 * to reestablish a nexus. This will run main if necessary.
152 * On command termination, the done function will be called as
155 * SCSI pointers are maintained in the SCp field of SCSI command
156 * structures, being initialized after the command is connected
157 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
158 * Note that in violation of the standard, an implicit SAVE POINTERS operation
159 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
164 * This file a skeleton Linux SCSI driver for the NCR 5380 series
165 * of chips. To use it, you write an architecture specific functions
166 * and macros and include this file in your driver.
168 * These macros control options :
169 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
170 * for commands that return with a CHECK CONDITION status.
172 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
175 * LINKED - if defined, linked commands are supported.
177 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
179 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
181 * These macros MUST be defined :
183 * NCR5380_read(register) - read from the specified register
185 * NCR5380_write(register, value) - write to the specific register
187 * NCR5380_implementation_fields - additional fields needed for this
188 * specific implementation of the NCR5380
190 * Either real DMA *or* pseudo DMA may be implemented
192 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
193 * Note that the DMA setup functions should return the number of bytes
194 * that they were able to program the controller for.
196 * Also note that generic i386/PC versions of these macros are
197 * available as NCR5380_i386_dma_write_setup,
198 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
200 * NCR5380_dma_write_setup(instance, src, count) - initialize
201 * NCR5380_dma_read_setup(instance, dst, count) - initialize
202 * NCR5380_dma_residual(instance); - residual count
205 * NCR5380_pwrite(instance, src, count)
206 * NCR5380_pread(instance, dst, count);
208 * The generic driver is initialized by calling NCR5380_init(instance),
209 * after setting the appropriate host specific fields and ID. If the
210 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
211 * possible) function may be used.
214 /* Macros ease life... :-) */
215 #define SETUP_HOSTDATA(in) \
216 struct NCR5380_hostdata *hostdata = \
217 (struct NCR5380_hostdata *)(in)->hostdata
218 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
220 #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
221 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
222 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble)
224 #define HOSTNO instance->host_no
225 #define H_NO(cmd) (cmd)->device->host->host_no
227 static int do_abort(struct Scsi_Host
*);
228 static void do_reset(struct Scsi_Host
*);
233 * Functions for handling tagged queuing
234 * =====================================
236 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
238 * Using consecutive numbers for the tags is no good idea in my eyes. There
239 * could be wrong re-usings if the counter (8 bit!) wraps and some early
240 * command has been preempted for a long time. My solution: a bitfield for
241 * remembering used tags.
243 * There's also the problem that each target has a certain queue size, but we
244 * cannot know it in advance :-( We just see a QUEUE_FULL status being
245 * returned. So, in this case, the driver internal queue size assumption is
246 * reduced to the number of active tags if QUEUE_FULL is returned by the
247 * target. The command is returned to the mid-level, but with status changed
248 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
251 * We're also not allowed running tagged commands as long as an untagged
252 * command is active. And REQUEST SENSE commands after a contingent allegiance
253 * condition _must_ be untagged. To keep track whether an untagged command has
254 * been issued, the host->busy array is still employed, as it is without
255 * support for tagged queuing.
257 * One could suspect that there are possible race conditions between
258 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
259 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
260 * which already guaranteed to be running at most once. It is also the only
261 * place where tags/LUNs are allocated. So no other allocation can slip
262 * between that pair, there could only happen a reselection, which can free a
263 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
264 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
267 static void __init
init_tags(struct NCR5380_hostdata
*hostdata
)
270 struct tag_alloc
*ta
;
272 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
275 for (target
= 0; target
< 8; ++target
) {
276 for (lun
= 0; lun
< 8; ++lun
) {
277 ta
= &hostdata
->TagAlloc
[target
][lun
];
278 bitmap_zero(ta
->allocated
, MAX_TAGS
);
279 ta
->nr_allocated
= 0;
280 /* At the beginning, assume the maximum queue size we could
281 * support (MAX_TAGS). This value will be decreased if the target
282 * returns QUEUE_FULL status.
284 ta
->queue_size
= MAX_TAGS
;
290 /* Check if we can issue a command to this LUN: First see if the LUN is marked
291 * busy by an untagged command. If the command should use tagged queuing, also
292 * check that there is a free tag and the target's queue won't overflow. This
293 * function should be called with interrupts disabled to avoid race
297 static int is_lun_busy(struct scsi_cmnd
*cmd
, int should_be_tagged
)
299 u8 lun
= cmd
->device
->lun
;
300 SETUP_HOSTDATA(cmd
->device
->host
);
302 if (hostdata
->busy
[cmd
->device
->id
] & (1 << lun
))
304 if (!should_be_tagged
||
305 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
306 !cmd
->device
->tagged_supported
)
308 if (hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].nr_allocated
>=
309 hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].queue_size
) {
310 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d: no free tags\n",
311 H_NO(cmd
), cmd
->device
->id
, lun
);
318 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
319 * must be called before!), or reserve the LUN in 'busy' if the command is
323 static void cmd_get_tag(struct scsi_cmnd
*cmd
, int should_be_tagged
)
325 u8 lun
= cmd
->device
->lun
;
326 SETUP_HOSTDATA(cmd
->device
->host
);
328 /* If we or the target don't support tagged queuing, allocate the LUN for
329 * an untagged command.
331 if (!should_be_tagged
||
332 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
333 !cmd
->device
->tagged_supported
) {
335 hostdata
->busy
[cmd
->device
->id
] |= (1 << lun
);
336 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d now allocated by untagged "
337 "command\n", H_NO(cmd
), cmd
->device
->id
, lun
);
339 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
341 cmd
->tag
= find_first_zero_bit(ta
->allocated
, MAX_TAGS
);
342 set_bit(cmd
->tag
, ta
->allocated
);
344 dprintk(NDEBUG_TAGS
, "scsi%d: using tag %d for target %d lun %d "
345 "(now %d tags in use)\n",
346 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
,
347 lun
, ta
->nr_allocated
);
352 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
356 static void cmd_free_tag(struct scsi_cmnd
*cmd
)
358 u8 lun
= cmd
->device
->lun
;
359 SETUP_HOSTDATA(cmd
->device
->host
);
361 if (cmd
->tag
== TAG_NONE
) {
362 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << lun
);
363 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d untagged cmd finished\n",
364 H_NO(cmd
), cmd
->device
->id
, lun
);
365 } else if (cmd
->tag
>= MAX_TAGS
) {
366 printk(KERN_NOTICE
"scsi%d: trying to free bad tag %d!\n",
367 H_NO(cmd
), cmd
->tag
);
369 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
370 clear_bit(cmd
->tag
, ta
->allocated
);
372 dprintk(NDEBUG_TAGS
, "scsi%d: freed tag %d for target %d lun %d\n",
373 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
, lun
);
378 static void free_all_tags(struct NCR5380_hostdata
*hostdata
)
381 struct tag_alloc
*ta
;
383 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
386 for (target
= 0; target
< 8; ++target
) {
387 for (lun
= 0; lun
< 8; ++lun
) {
388 ta
= &hostdata
->TagAlloc
[target
][lun
];
389 bitmap_zero(ta
->allocated
, MAX_TAGS
);
390 ta
->nr_allocated
= 0;
395 #endif /* SUPPORT_TAGS */
399 * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd )
401 * Purpose: Try to merge several scatter-gather requests into one DMA
402 * transfer. This is possible if the scatter buffers lie on
403 * physical contiguous addresses.
405 * Parameters: struct scsi_cmnd *cmd
406 * The command to work on. The first scatter buffer's data are
407 * assumed to be already transferred into ptr/this_residual.
410 static void merge_contiguous_buffers(struct scsi_cmnd
*cmd
)
412 #if !defined(CONFIG_SUN3)
413 unsigned long endaddr
;
414 #if (NDEBUG & NDEBUG_MERGING)
415 unsigned long oldlen
= cmd
->SCp
.this_residual
;
419 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
420 cmd
->SCp
.buffers_residual
&&
421 virt_to_phys(sg_virt(&cmd
->SCp
.buffer
[1])) == endaddr
;) {
422 dprintk(NDEBUG_MERGING
, "VTOP(%p) == %08lx -> merging\n",
423 page_address(sg_page(&cmd
->SCp
.buffer
[1])), endaddr
);
424 #if (NDEBUG & NDEBUG_MERGING)
428 --cmd
->SCp
.buffers_residual
;
429 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
430 endaddr
+= cmd
->SCp
.buffer
->length
;
432 #if (NDEBUG & NDEBUG_MERGING)
433 if (oldlen
!= cmd
->SCp
.this_residual
)
434 dprintk(NDEBUG_MERGING
, "merged %d buffers from %p, new length %08x\n",
435 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
437 #endif /* !defined(CONFIG_SUN3) */
441 * initialize_SCp - init the scsi pointer field
442 * @cmd: command block to set up
444 * Set up the internal fields in the SCSI command.
447 static inline void initialize_SCp(struct scsi_cmnd
*cmd
)
450 * Initialize the Scsi Pointer field so that all of the commands in the
451 * various queues are valid.
454 if (scsi_bufflen(cmd
)) {
455 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
456 cmd
->SCp
.buffers_residual
= scsi_sg_count(cmd
) - 1;
457 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
458 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
459 /* ++roman: Try to merge some scatter-buffers if they are at
460 * contiguous physical addresses.
462 merge_contiguous_buffers(cmd
);
464 cmd
->SCp
.buffer
= NULL
;
465 cmd
->SCp
.buffers_residual
= 0;
467 cmd
->SCp
.this_residual
= 0;
472 * NCR5380_poll_politely - wait for chip register value
473 * @instance: controller to poll
474 * @reg: 5380 register to poll
475 * @bit: Bitmask to check
476 * @val: Value required to exit
477 * @wait: Time-out in jiffies
479 * Polls the chip in a reasonably efficient manner waiting for an
480 * event to occur. After a short quick poll we begin to yield the CPU
481 * (if possible). In irq contexts the time-out is arbitrarily limited.
482 * Callers may hold locks as long as they are held in irq mode.
484 * Returns 0 if event occurred otherwise -ETIMEDOUT.
487 static int NCR5380_poll_politely(struct Scsi_Host
*instance
,
488 int reg
, int bit
, int val
, int wait
)
490 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
491 unsigned long deadline
= jiffies
+ wait
;
494 /* Busy-wait for up to 10 ms */
495 n
= min(10000U, jiffies_to_usecs(wait
));
496 n
*= hostdata
->accesses_per_ms
;
499 if ((NCR5380_read(reg
) & bit
) == val
)
504 if (irqs_disabled() || in_interrupt())
507 /* Repeatedly sleep for 1 ms until deadline */
508 while (time_is_after_jiffies(deadline
)) {
509 schedule_timeout_uninterruptible(1);
510 if ((NCR5380_read(reg
) & bit
) == val
)
517 #include <linux/delay.h>
524 { SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
525 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
526 { SR_SEL
, "SEL" }, {0, NULL
}
528 {BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}
530 {ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
531 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
532 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
535 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"}, {MR_TARGET
, "MODE TARGET"},
536 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR
,
537 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR
,"MODE EOP INTR"},
538 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
539 {MR_DMA_MODE
, "MODE DMA"}, {MR_ARBITRATE
, "MODE ARBITRATION"},
544 * NCR5380_print - print scsi bus signals
545 * @instance: adapter state to dump
547 * Print the SCSI bus signals for debugging purposes
550 static void NCR5380_print(struct Scsi_Host
*instance
)
552 unsigned char status
, data
, basr
, mr
, icr
, i
;
555 local_irq_save(flags
);
556 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
557 status
= NCR5380_read(STATUS_REG
);
558 mr
= NCR5380_read(MODE_REG
);
559 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
560 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
561 local_irq_restore(flags
);
562 printk("STATUS_REG: %02x ", status
);
563 for (i
= 0; signals
[i
].mask
; ++i
)
564 if (status
& signals
[i
].mask
)
565 printk(",%s", signals
[i
].name
);
566 printk("\nBASR: %02x ", basr
);
567 for (i
= 0; basrs
[i
].mask
; ++i
)
568 if (basr
& basrs
[i
].mask
)
569 printk(",%s", basrs
[i
].name
);
570 printk("\nICR: %02x ", icr
);
571 for (i
= 0; icrs
[i
].mask
; ++i
)
572 if (icr
& icrs
[i
].mask
)
573 printk(",%s", icrs
[i
].name
);
574 printk("\nMODE: %02x ", mr
);
575 for (i
= 0; mrs
[i
].mask
; ++i
)
576 if (mr
& mrs
[i
].mask
)
577 printk(",%s", mrs
[i
].name
);
585 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
586 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
587 {PHASE_UNKNOWN
, "UNKNOWN"}
591 * NCR5380_print_phase - show SCSI phase
592 * @instance: adapter to dump
594 * Print the current SCSI phase for debugging purposes
599 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
601 unsigned char status
;
604 status
= NCR5380_read(STATUS_REG
);
605 if (!(status
& SR_REQ
))
606 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
608 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
609 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
611 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
618 * ++roman: New scheme of calling NCR5380_main()
620 * If we're not in an interrupt, we can call our main directly, it cannot be
621 * already running. Else, we queue it on a task queue, if not 'main_running'
622 * tells us that a lower level is already executing it. This way,
623 * 'main_running' needs not be protected in a special way.
625 * queue_main() is a utility function for putting our main onto the task
626 * queue, if main_running is false. It should be called only from a
627 * interrupt or bottom half.
630 #include <linux/gfp.h>
631 #include <linux/workqueue.h>
632 #include <linux/interrupt.h>
634 static inline void queue_main(struct NCR5380_hostdata
*hostdata
)
636 if (!hostdata
->main_running
) {
637 /* If in interrupt and NCR5380_main() not already running,
638 queue it on the 'immediate' task queue, to be processed
639 immediately after the current interrupt processing has
641 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
643 /* else: nothing to do: the running NCR5380_main() will pick up
644 any newly queued command. */
648 * NCR58380_info - report driver and host information
649 * @instance: relevant scsi host instance
651 * For use as the host template info() handler.
656 static const char *NCR5380_info(struct Scsi_Host
*instance
)
658 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
660 return hostdata
->info
;
663 static void prepare_info(struct Scsi_Host
*instance
)
665 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
667 snprintf(hostdata
->info
, sizeof(hostdata
->info
),
668 "%s, io_port 0x%lx, n_io_port %d, "
669 "base 0x%lx, irq %d, "
670 "can_queue %d, cmd_per_lun %d, "
671 "sg_tablesize %d, this_id %d, "
674 instance
->hostt
->name
, instance
->io_port
, instance
->n_io_port
,
675 instance
->base
, instance
->irq
,
676 instance
->can_queue
, instance
->cmd_per_lun
,
677 instance
->sg_tablesize
, instance
->this_id
,
678 hostdata
->flags
& FLAG_TAGGED_QUEUING
? "TAGGED_QUEUING " : "",
679 hostdata
->flags
& FLAG_TOSHIBA_DELAY
? "TOSHIBA_DELAY " : "",
696 * NCR5380_print_status - dump controller info
697 * @instance: controller to dump
699 * Print commands in the various queues, called from NCR5380_abort
703 static void lprint_Scsi_Cmnd(struct scsi_cmnd
*cmd
)
706 unsigned char *command
;
707 printk("scsi%d: destination target %d, lun %llu\n",
708 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
709 printk(KERN_CONT
" command = ");
711 printk(KERN_CONT
"%2d (0x%02x)", command
[0], command
[0]);
712 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
713 printk(KERN_CONT
" %02x", command
[i
]);
717 static void __maybe_unused
NCR5380_print_status(struct Scsi_Host
*instance
)
719 struct NCR5380_hostdata
*hostdata
;
720 struct scsi_cmnd
*ptr
;
723 NCR5380_dprint(NDEBUG_ANY
, instance
);
724 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
726 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
728 local_irq_save(flags
);
729 printk("NCR5380: coroutine is%s running.\n",
730 hostdata
->main_running
? "" : "n't");
731 if (!hostdata
->connected
)
732 printk("scsi%d: no currently connected command\n", HOSTNO
);
734 lprint_Scsi_Cmnd((struct scsi_cmnd
*) hostdata
->connected
);
735 printk("scsi%d: issue_queue\n", HOSTNO
);
736 for (ptr
= (struct scsi_cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
))
737 lprint_Scsi_Cmnd(ptr
);
739 printk("scsi%d: disconnected_queue\n", HOSTNO
);
740 for (ptr
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; ptr
;
742 lprint_Scsi_Cmnd(ptr
);
744 local_irq_restore(flags
);
748 static void show_Scsi_Cmnd(struct scsi_cmnd
*cmd
, struct seq_file
*m
)
751 unsigned char *command
;
752 seq_printf(m
, "scsi%d: destination target %d, lun %llu\n",
753 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
754 seq_puts(m
, " command = ");
756 seq_printf(m
, "%2d (0x%02x)", command
[0], command
[0]);
757 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
758 seq_printf(m
, " %02x", command
[i
]);
762 static int __maybe_unused
NCR5380_show_info(struct seq_file
*m
,
763 struct Scsi_Host
*instance
)
765 struct NCR5380_hostdata
*hostdata
;
766 struct scsi_cmnd
*ptr
;
769 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
771 local_irq_save(flags
);
772 seq_printf(m
, "NCR5380: coroutine is%s running.\n",
773 hostdata
->main_running
? "" : "n't");
774 if (!hostdata
->connected
)
775 seq_printf(m
, "scsi%d: no currently connected command\n", HOSTNO
);
777 show_Scsi_Cmnd((struct scsi_cmnd
*) hostdata
->connected
, m
);
778 seq_printf(m
, "scsi%d: issue_queue\n", HOSTNO
);
779 for (ptr
= (struct scsi_cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
))
780 show_Scsi_Cmnd(ptr
, m
);
782 seq_printf(m
, "scsi%d: disconnected_queue\n", HOSTNO
);
783 for (ptr
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; ptr
;
785 show_Scsi_Cmnd(ptr
, m
);
787 local_irq_restore(flags
);
792 * NCR5380_init - initialise an NCR5380
793 * @instance: adapter to configure
794 * @flags: control flags
796 * Initializes *instance and corresponding 5380 chip,
797 * with flags OR'd into the initial flags value.
799 * Notes : I assume that the host, hostno, and id bits have been
800 * set correctly. I don't care about the irq and other fields.
802 * Returns 0 for success
805 static int __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
808 SETUP_HOSTDATA(instance
);
809 unsigned long deadline
;
811 hostdata
->host
= instance
;
812 hostdata
->id_mask
= 1 << instance
->this_id
;
813 hostdata
->id_higher_mask
= 0;
814 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
815 if (i
> hostdata
->id_mask
)
816 hostdata
->id_higher_mask
|= i
;
817 for (i
= 0; i
< 8; ++i
)
818 hostdata
->busy
[i
] = 0;
822 #if defined (REAL_DMA)
823 hostdata
->dma_len
= 0;
825 hostdata
->connected
= NULL
;
826 hostdata
->issue_queue
= NULL
;
827 hostdata
->disconnected_queue
= NULL
;
828 hostdata
->flags
= flags
;
830 INIT_WORK(&hostdata
->main_task
, NCR5380_main
);
831 hostdata
->work_q
= alloc_workqueue("ncr5380_%d",
832 WQ_UNBOUND
| WQ_MEM_RECLAIM
,
833 1, instance
->host_no
);
834 if (!hostdata
->work_q
)
837 prepare_info(instance
);
839 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
840 NCR5380_write(MODE_REG
, MR_BASE
);
841 NCR5380_write(TARGET_COMMAND_REG
, 0);
842 NCR5380_write(SELECT_ENABLE_REG
, 0);
844 /* Calibrate register polling loop */
846 deadline
= jiffies
+ 1;
849 } while (time_is_after_jiffies(deadline
));
850 deadline
+= msecs_to_jiffies(256);
852 NCR5380_read(STATUS_REG
);
855 } while (time_is_after_jiffies(deadline
));
856 hostdata
->accesses_per_ms
= i
/ 256;
862 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
863 * @instance: adapter to check
865 * If the system crashed, it may have crashed with a connected target and
866 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
867 * currently established nexus, which we know nothing about. Failing that
870 * Note that a bus reset will cause the chip to assert IRQ.
872 * Returns 0 if successful, otherwise -ENXIO.
875 static int NCR5380_maybe_reset_bus(struct Scsi_Host
*instance
)
877 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
880 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) && pass
<= 6; ++pass
) {
885 shost_printk(KERN_ERR
, instance
, "SCSI bus busy, waiting up to five seconds\n");
886 NCR5380_poll_politely(instance
,
887 STATUS_REG
, SR_BSY
, 0, 5 * HZ
);
890 shost_printk(KERN_ERR
, instance
, "bus busy, attempting abort\n");
894 shost_printk(KERN_ERR
, instance
, "bus busy, attempting reset\n");
896 /* Wait after a reset; the SCSI standard calls for
897 * 250ms, we wait 500ms to be on the safe side.
898 * But some Toshiba CD-ROMs need ten times that.
900 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
906 shost_printk(KERN_ERR
, instance
, "bus locked solid\n");
914 * NCR5380_exit - remove an NCR5380
915 * @instance: adapter to remove
917 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
920 static void NCR5380_exit(struct Scsi_Host
*instance
)
922 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
924 cancel_work_sync(&hostdata
->main_task
);
925 destroy_workqueue(hostdata
->work_q
);
929 * NCR5380_queue_command - queue a command
930 * @instance: the relevant SCSI adapter
933 * cmd is added to the per-instance issue queue, with minor
934 * twiddling done to the host specific fields of cmd. If the
935 * main coroutine is not running, it is restarted.
938 static int NCR5380_queue_command(struct Scsi_Host
*instance
,
939 struct scsi_cmnd
*cmd
)
941 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
942 struct scsi_cmnd
*tmp
;
945 #if (NDEBUG & NDEBUG_NO_WRITE)
946 switch (cmd
->cmnd
[0]) {
949 printk(KERN_NOTICE
"scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
951 cmd
->result
= (DID_ERROR
<< 16);
955 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
958 * We use the host_scribble field as a pointer to the next command
966 * Insert the cmd into the issue queue. Note that REQUEST SENSE
967 * commands are added to the head of the queue since any command will
968 * clear the contingent allegiance condition that exists and the
969 * sense data is only guaranteed to be valid while the condition exists.
972 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
973 * Otherwise a running NCR5380_main may steal the lock.
974 * Lock before actually inserting due to fairness reasons explained in
975 * atari_scsi.c. If we insert first, then it's impossible for this driver
976 * to release the lock.
977 * Stop timer for this command while waiting for the lock, or timeouts
978 * may happen (and they really do), and it's no good if the command doesn't
979 * appear in any of the queues.
980 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
981 * because also a timer int can trigger an abort or reset, which would
982 * alter queues and touch the lock.
984 if (!NCR5380_acquire_dma_irq(instance
))
985 return SCSI_MLQUEUE_HOST_BUSY
;
987 local_irq_save(flags
);
990 * Insert the cmd into the issue queue. Note that REQUEST SENSE
991 * commands are added to the head of the queue since any command will
992 * clear the contingent allegiance condition that exists and the
993 * sense data is only guaranteed to be valid while the condition exists.
996 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
997 LIST(cmd
, hostdata
->issue_queue
);
998 SET_NEXT(cmd
, hostdata
->issue_queue
);
999 hostdata
->issue_queue
= cmd
;
1001 for (tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
1002 NEXT(tmp
); tmp
= NEXT(tmp
))
1007 local_irq_restore(flags
);
1009 dprintk(NDEBUG_QUEUES
, "scsi%d: command added to %s of queue\n", H_NO(cmd
),
1010 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
1012 /* If queue_command() is called from an interrupt (real one or bottom
1013 * half), we let queue_main() do the job of taking care about main. If it
1014 * is already running, this is a no-op, else main will be queued.
1016 * If we're not in an interrupt, we can call NCR5380_main()
1017 * unconditionally, because it cannot be already running.
1019 if (in_interrupt() || irqs_disabled())
1020 queue_main(hostdata
);
1022 NCR5380_main(&hostdata
->main_task
);
1026 static inline void maybe_release_dma_irq(struct Scsi_Host
*instance
)
1028 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1030 /* Caller does the locking needed to set & test these data atomically */
1031 if (!hostdata
->disconnected_queue
&&
1032 !hostdata
->issue_queue
&&
1033 !hostdata
->connected
&&
1034 !hostdata
->retain_dma_intr
)
1035 NCR5380_release_dma_irq(instance
);
1039 * NCR5380_main - NCR state machines
1041 * NCR5380_main is a coroutine that runs as long as more work can
1042 * be done on the NCR5380 host adapters in a system. Both
1043 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1044 * in case it is not running.
1046 * Locks: called as its own thread with no locks held.
1049 static void NCR5380_main(struct work_struct
*work
)
1051 struct NCR5380_hostdata
*hostdata
=
1052 container_of(work
, struct NCR5380_hostdata
, main_task
);
1053 struct Scsi_Host
*instance
= hostdata
->host
;
1054 struct scsi_cmnd
*tmp
, *prev
;
1056 unsigned long flags
;
1059 * We run (with interrupts disabled) until we're sure that none of
1060 * the host adapters have anything that can be done, at which point
1061 * we set main_running to 0 and exit.
1063 * Interrupts are enabled before doing various other internal
1064 * instructions, after we've decided that we need to run through
1067 * this should prevent any race conditions.
1069 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1070 * because also a timer int can trigger an abort or reset, which can
1071 * alter queues and touch the Falcon lock.
1074 /* Tell int handlers main() is now already executing. Note that
1075 no races are possible here. If an int comes in before
1076 'main_running' is set here, and queues/executes main via the
1077 task queue, it doesn't do any harm, just this instance of main
1078 won't find any work left to do. */
1079 if (hostdata
->main_running
)
1081 hostdata
->main_running
= 1;
1083 local_save_flags(flags
);
1085 local_irq_disable(); /* Freeze request queues */
1088 if (!hostdata
->connected
) {
1089 dprintk(NDEBUG_MAIN
, "scsi%d: not connected\n", HOSTNO
);
1091 * Search through the issue_queue for a command destined
1092 * for a target that's not busy.
1094 #if (NDEBUG & NDEBUG_LISTS)
1095 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
1096 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
1098 /*printk("%p ", tmp);*/
1099 if ((tmp
== prev
) && tmp
)
1101 /* else printk("\n"); */
1103 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
,
1104 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
1105 u8 lun
= tmp
->device
->lun
;
1107 dprintk(NDEBUG_LISTS
,
1108 "MAIN tmp=%p target=%d busy=%d lun=%d\n",
1109 tmp
, scmd_id(tmp
), hostdata
->busy
[scmd_id(tmp
)],
1111 /* When we find one, remove it from the issue queue. */
1112 /* ++guenther: possible race with Falcon locking */
1115 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
1117 !(hostdata
->busy
[tmp
->device
->id
] & (1 << lun
))
1120 /* ++guenther: just to be sure, this must be atomic */
1121 local_irq_disable();
1123 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
1124 SET_NEXT(prev
, NEXT(tmp
));
1126 REMOVE(-1, hostdata
->issue_queue
, tmp
, NEXT(tmp
));
1127 hostdata
->issue_queue
= NEXT(tmp
);
1129 SET_NEXT(tmp
, NULL
);
1130 hostdata
->retain_dma_intr
++;
1132 /* reenable interrupts after finding one */
1133 local_irq_restore(flags
);
1136 * Attempt to establish an I_T_L nexus here.
1137 * On success, instance->hostdata->connected is set.
1138 * On failure, we must add the command back to the
1139 * issue queue so we can keep trying.
1141 dprintk(NDEBUG_MAIN
, "scsi%d: main(): command for target %d "
1142 "lun %d removed from issue_queue\n",
1143 HOSTNO
, tmp
->device
->id
, lun
);
1145 * REQUEST SENSE commands are issued without tagged
1146 * queueing, even on SCSI-II devices because the
1147 * contingent allegiance condition exists for the
1150 /* ++roman: ...and the standard also requires that
1151 * REQUEST SENSE command are untagged.
1155 cmd_get_tag(tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
1157 if (!NCR5380_select(instance
, tmp
)) {
1158 /* OK or bad target */
1159 local_irq_disable();
1160 hostdata
->retain_dma_intr
--;
1161 maybe_release_dma_irq(instance
);
1162 local_irq_restore(flags
);
1165 local_irq_disable();
1166 LIST(tmp
, hostdata
->issue_queue
);
1167 SET_NEXT(tmp
, hostdata
->issue_queue
);
1168 hostdata
->issue_queue
= tmp
;
1172 hostdata
->retain_dma_intr
--;
1173 local_irq_restore(flags
);
1175 dprintk(NDEBUG_MAIN
, "scsi%d: main(): select() failed, "
1176 "returned to issue_queue\n", HOSTNO
);
1178 if (hostdata
->connected
)
1180 } /* if target/lun/target queue is not busy */
1181 } /* for issue_queue */
1182 } /* if (!hostdata->connected) */
1184 if (hostdata
->connected
1186 && !hostdata
->dma_len
1189 local_irq_restore(flags
);
1190 dprintk(NDEBUG_MAIN
, "scsi%d: main: performing information transfer\n",
1192 NCR5380_information_transfer(instance
);
1193 dprintk(NDEBUG_MAIN
, "scsi%d: main: done set false\n", HOSTNO
);
1198 /* Better allow ints _after_ 'main_running' has been cleared, else
1199 an interrupt could believe we'll pick up the work it left for
1200 us, but we won't see it anymore here... */
1201 hostdata
->main_running
= 0;
1202 local_irq_restore(flags
);
1208 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1210 * Purpose : Called by interrupt handler when DMA finishes or a phase
1211 * mismatch occurs (which would finish the DMA transfer).
1213 * Inputs : instance - this instance of the NCR5380.
1217 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
1219 SETUP_HOSTDATA(instance
);
1221 unsigned char **data
;
1222 volatile int *count
;
1223 int saved_data
= 0, overrun
= 0;
1226 if (!hostdata
->connected
) {
1227 printk(KERN_WARNING
"scsi%d: received end of DMA interrupt with "
1228 "no connected cmd\n", HOSTNO
);
1232 if (hostdata
->read_overruns
) {
1233 p
= hostdata
->connected
->SCp
.phase
;
1236 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
1237 (BASR_PHASE_MATCH
|BASR_ACK
)) ==
1238 (BASR_PHASE_MATCH
|BASR_ACK
)) {
1239 saved_data
= NCR5380_read(INPUT_DATA_REG
);
1241 dprintk(NDEBUG_DMA
, "scsi%d: read overrun handled\n", HOSTNO
);
1246 dprintk(NDEBUG_DMA
, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1247 HOSTNO
, NCR5380_read(BUS_AND_STATUS_REG
),
1248 NCR5380_read(STATUS_REG
));
1250 #if defined(CONFIG_SUN3)
1251 if ((sun3scsi_dma_finish(rq_data_dir(hostdata
->connected
->request
)))) {
1252 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
1257 /* make sure we're not stuck in a data phase */
1258 if ((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
1259 (BASR_PHASE_MATCH
| BASR_ACK
)) {
1260 pr_err("scsi%d: BASR %02x\n", instance
->host_no
,
1261 NCR5380_read(BUS_AND_STATUS_REG
));
1262 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
1268 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1269 NCR5380_write(MODE_REG
, MR_BASE
);
1270 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1272 transferred
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1273 hostdata
->dma_len
= 0;
1275 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
1276 count
= &hostdata
->connected
->SCp
.this_residual
;
1277 *data
+= transferred
;
1278 *count
-= transferred
;
1280 if (hostdata
->read_overruns
) {
1283 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
1284 cnt
= toPIO
= hostdata
->read_overruns
;
1286 dprintk(NDEBUG_DMA
, "Got an input overrun, using saved byte\n");
1287 *(*data
)++ = saved_data
;
1292 dprintk(NDEBUG_DMA
, "Doing %d-byte PIO to 0x%08lx\n", cnt
, (long)*data
);
1293 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
);
1294 *count
-= toPIO
- cnt
;
1298 #endif /* REAL_DMA */
1302 * NCR5380_intr - generic NCR5380 irq handler
1303 * @irq: interrupt number
1304 * @dev_id: device info
1306 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1307 * from the disconnected queue, and restarting NCR5380_main()
1311 static irqreturn_t
NCR5380_intr(int irq
, void *dev_id
)
1313 struct Scsi_Host
*instance
= dev_id
;
1314 int done
= 1, handled
= 0;
1317 dprintk(NDEBUG_INTR
, "scsi%d: NCR5380 irq triggered\n", HOSTNO
);
1319 /* Look for pending interrupts */
1320 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1321 dprintk(NDEBUG_INTR
, "scsi%d: BASR=%02x\n", HOSTNO
, basr
);
1322 /* dispatch to appropriate routine if found and done=0 */
1323 if (basr
& BASR_IRQ
) {
1324 NCR5380_dprint(NDEBUG_INTR
, instance
);
1325 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
|SR_IO
)) == (SR_SEL
|SR_IO
)) {
1327 dprintk(NDEBUG_INTR
, "scsi%d: SEL interrupt\n", HOSTNO
);
1328 NCR5380_reselect(instance
);
1329 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1330 } else if (basr
& BASR_PARITY_ERROR
) {
1331 dprintk(NDEBUG_INTR
, "scsi%d: PARITY interrupt\n", HOSTNO
);
1332 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1333 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1334 dprintk(NDEBUG_INTR
, "scsi%d: RESET interrupt\n", HOSTNO
);
1335 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1338 * The rest of the interrupt conditions can occur only during a
1342 #if defined(REAL_DMA)
1344 * We should only get PHASE MISMATCH and EOP interrupts if we have
1345 * DMA enabled, so do a sanity check based on the current setting
1346 * of the MODE register.
1349 if ((NCR5380_read(MODE_REG
) & MR_DMA_MODE
) &&
1350 ((basr
& BASR_END_DMA_TRANSFER
) ||
1351 !(basr
& BASR_PHASE_MATCH
))) {
1353 dprintk(NDEBUG_INTR
, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO
);
1354 NCR5380_dma_complete( instance
);
1357 #endif /* REAL_DMA */
1359 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1360 if (basr
& BASR_PHASE_MATCH
)
1361 dprintk(NDEBUG_INTR
, "scsi%d: unknown interrupt, "
1362 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1363 HOSTNO
, basr
, NCR5380_read(MODE_REG
),
1364 NCR5380_read(STATUS_REG
));
1365 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1366 #ifdef SUN3_SCSI_VME
1367 dregs
->csr
|= CSR_DMA_ENABLE
;
1370 } /* if !(SELECTION || PARITY) */
1372 } /* BASR & IRQ */ else {
1373 printk(KERN_NOTICE
"scsi%d: interrupt without IRQ bit set in BASR, "
1374 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO
, basr
,
1375 NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1376 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1377 #ifdef SUN3_SCSI_VME
1378 dregs
->csr
|= CSR_DMA_ENABLE
;
1383 dprintk(NDEBUG_INTR
, "scsi%d: in int routine, calling main\n", HOSTNO
);
1384 /* Put a call to NCR5380_main() on the queue... */
1385 queue_main(shost_priv(instance
));
1387 return IRQ_RETVAL(handled
);
1391 * Function : int NCR5380_select(struct Scsi_Host *instance,
1392 * struct scsi_cmnd *cmd)
1394 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1395 * including ARBITRATION, SELECTION, and initial message out for
1396 * IDENTIFY and queue messages.
1398 * Inputs : instance - instantiation of the 5380 driver on which this
1399 * target lives, cmd - SCSI command to execute.
1401 * Returns : -1 if selection failed but should be retried.
1402 * 0 if selection failed and should not be retried.
1403 * 0 if selection succeeded completely (hostdata->connected == cmd).
1406 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1407 * with registers as they should have been on entry - ie
1408 * SELECT_ENABLE will be set appropriately, the NCR5380
1409 * will cease to drive any SCSI bus signals.
1411 * If successful : I_T_L or I_T_L_Q nexus will be established,
1412 * instance->connected will be set to cmd.
1413 * SELECT interrupt will be disabled.
1415 * If failed (no target) : cmd->scsi_done() will be called, and the
1416 * cmd->result host byte set to DID_BAD_TARGET.
1419 static int NCR5380_select(struct Scsi_Host
*instance
, struct scsi_cmnd
*cmd
)
1421 SETUP_HOSTDATA(instance
);
1422 unsigned char tmp
[3], phase
;
1423 unsigned char *data
;
1426 unsigned long flags
;
1428 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
1429 dprintk(NDEBUG_ARBITRATION
, "scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1433 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1434 * data bus during SELECTION.
1437 local_irq_save(flags
);
1438 if (hostdata
->connected
) {
1439 local_irq_restore(flags
);
1442 NCR5380_write(TARGET_COMMAND_REG
, 0);
1445 * Start arbitration.
1448 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1449 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1451 local_irq_restore(flags
);
1453 /* Wait for arbitration logic to complete */
1454 #if defined(NCR_TIMEOUT)
1456 unsigned long timeout
= jiffies
+ 2*NCR_TIMEOUT
;
1458 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1459 time_before(jiffies
, timeout
) && !hostdata
->connected
)
1461 if (time_after_eq(jiffies
, timeout
)) {
1462 printk("scsi : arbitration timeout at %d\n", __LINE__
);
1463 NCR5380_write(MODE_REG
, MR_BASE
);
1464 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1468 #else /* NCR_TIMEOUT */
1469 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1470 !hostdata
->connected
)
1474 dprintk(NDEBUG_ARBITRATION
, "scsi%d: arbitration complete\n", HOSTNO
);
1476 if (hostdata
->connected
) {
1477 NCR5380_write(MODE_REG
, MR_BASE
);
1481 * The arbitration delay is 2.2us, but this is a minimum and there is
1482 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1483 * the integral nature of udelay().
1489 /* Check for lost arbitration */
1490 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1491 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1492 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1493 hostdata
->connected
) {
1494 NCR5380_write(MODE_REG
, MR_BASE
);
1495 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1500 /* After/during arbitration, BSY should be asserted.
1501 * IBM DPES-31080 Version S31Q works now
1502 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1504 NCR5380_write(INITIATOR_COMMAND_REG
,
1505 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1507 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1508 hostdata
->connected
) {
1509 NCR5380_write(MODE_REG
, MR_BASE
);
1510 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1511 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1517 * Again, bus clear + bus settle time is 1.2us, however, this is
1518 * a minimum so we'll udelay ceil(1.2)
1521 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
1526 if (hostdata
->connected
) {
1527 NCR5380_write(MODE_REG
, MR_BASE
);
1528 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1532 dprintk(NDEBUG_ARBITRATION
, "scsi%d: won arbitration\n", HOSTNO
);
1535 * Now that we have won arbitration, start Selection process, asserting
1536 * the host and target ID's on the SCSI bus.
1539 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1542 * Raise ATN while SEL is true before BSY goes false from arbitration,
1543 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1544 * phase immediately after selection.
1547 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1548 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1549 NCR5380_write(MODE_REG
, MR_BASE
);
1552 * Reselect interrupts must be turned off prior to the dropping of BSY,
1553 * otherwise we will trigger an interrupt.
1556 if (hostdata
->connected
) {
1557 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1561 NCR5380_write(SELECT_ENABLE_REG
, 0);
1564 * The initiator shall then wait at least two deskew delays and release
1567 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1570 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1571 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1574 * Something weird happens when we cease to drive BSY - looks
1575 * like the board/chip is letting us do another read before the
1576 * appropriate propagation delay has expired, and we're confusing
1577 * a BSY signal from ourselves as the target's response to SELECTION.
1579 * A small delay (the 'C++' frontend breaks the pipeline with an
1580 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1581 * tighter 'C' code breaks and requires this) solves the problem -
1582 * the 1 us delay is arbitrary, and only used because this delay will
1583 * be the same on other platforms and since it works here, it should
1586 * wingel suggests that this could be due to failing to wait
1592 dprintk(NDEBUG_SELECTION
, "scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1595 * The SCSI specification calls for a 250 ms timeout for the actual
1599 err
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_BSY
, SR_BSY
,
1600 msecs_to_jiffies(250));
1602 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1603 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1604 NCR5380_reselect(instance
);
1605 printk(KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1607 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1612 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1613 cmd
->result
= DID_BAD_TARGET
<< 16;
1617 cmd
->scsi_done(cmd
);
1618 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1619 dprintk(NDEBUG_SELECTION
, "scsi%d: target did not respond within 250ms\n", HOSTNO
);
1624 * No less than two deskew delays after the initiator detects the
1625 * BSY signal is true, it shall release the SEL signal and may
1626 * change the DATA BUS. -wingel
1631 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1634 * Since we followed the SCSI spec, and raised ATN while SEL
1635 * was true but before BSY was false during selection, the information
1636 * transfer phase should be a MESSAGE OUT phase so that we can send the
1639 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1640 * message (2 bytes) with a tag ID that we increment with every command
1641 * until it wraps back to 0.
1643 * XXX - it turns out that there are some broken SCSI-II devices,
1644 * which claim to support tagged queuing but fail when more than
1645 * some number of commands are issued at once.
1648 /* Wait for start of REQ/ACK handshake */
1649 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
1652 dprintk(NDEBUG_SELECTION
, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1653 HOSTNO
, cmd
->device
->id
);
1654 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1657 if (cmd
->tag
!= TAG_NONE
) {
1658 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1666 #endif /* SUPPORT_TAGS */
1668 /* Send message(s) */
1670 phase
= PHASE_MSGOUT
;
1671 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1672 dprintk(NDEBUG_SELECTION
, "scsi%d: nexus established.\n", HOSTNO
);
1673 /* XXX need to handle errors here */
1674 hostdata
->connected
= cmd
;
1675 #ifndef SUPPORT_TAGS
1676 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1678 #ifdef SUN3_SCSI_VME
1679 dregs
->csr
|= CSR_INTR
;
1682 initialize_SCp(cmd
);
1688 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1689 * unsigned char *phase, int *count, unsigned char **data)
1691 * Purpose : transfers data in given phase using polled I/O
1693 * Inputs : instance - instance of driver, *phase - pointer to
1694 * what phase is expected, *count - pointer to number of
1695 * bytes to transfer, **data - pointer to data pointer.
1697 * Returns : -1 when different phase is entered without transferring
1698 * maximum number of bytes, 0 if all bytes are transferred or exit
1701 * Also, *phase, *count, *data are modified in place.
1703 * XXX Note : handling for bus free may be useful.
1707 * Note : this code is not as quick as it could be, however it
1708 * IS 100% reliable, and for the actual data transfer where speed
1709 * counts, we will always do a pseudo DMA or DMA transfer.
1712 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1713 unsigned char *phase
, int *count
,
1714 unsigned char **data
)
1716 register unsigned char p
= *phase
, tmp
;
1717 register int c
= *count
;
1718 register unsigned char *d
= *data
;
1721 * The NCR5380 chip will only drive the SCSI bus when the
1722 * phase specified in the appropriate bits of the TARGET COMMAND
1723 * REGISTER match the STATUS REGISTER
1726 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1730 * Wait for assertion of REQ, after which the phase bits will be
1734 if (NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
) < 0)
1737 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: REQ detected\n", HOSTNO
);
1739 /* Check for phase mismatch */
1740 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) != p
) {
1741 dprintk(NDEBUG_PIO
, "scsi%d: phase mismatch\n", HOSTNO
);
1742 NCR5380_dprint_phase(NDEBUG_PIO
, instance
);
1746 /* Do actual transfer from SCSI bus to / from memory */
1748 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1750 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1755 * The SCSI standard suggests that in MSGOUT phase, the initiator
1756 * should drop ATN on the last byte of the message phase
1757 * after REQ has been asserted for the handshake but before
1758 * the initiator raises ACK.
1762 if (!((p
& SR_MSG
) && c
> 1)) {
1763 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1764 NCR5380_dprint(NDEBUG_PIO
, instance
);
1765 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1766 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1768 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1769 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1770 NCR5380_dprint(NDEBUG_PIO
, instance
);
1771 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1772 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1775 NCR5380_dprint(NDEBUG_PIO
, instance
);
1776 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1779 if (NCR5380_poll_politely(instance
,
1780 STATUS_REG
, SR_REQ
, 0, 5 * HZ
) < 0)
1783 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: req false, handshake complete\n", HOSTNO
);
1786 * We have several special cases to consider during REQ/ACK handshaking :
1787 * 1. We were in MSGOUT phase, and we are on the last byte of the
1788 * message. ATN must be dropped as ACK is dropped.
1790 * 2. We are in a MSGIN phase, and we are on the last byte of the
1791 * message. We must exit with ACK asserted, so that the calling
1792 * code may raise ATN before dropping ACK to reject the message.
1794 * 3. ACK and ATN are clear and the target may proceed as normal.
1796 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1797 if (p
== PHASE_MSGOUT
&& c
> 1)
1798 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1800 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1804 dprintk(NDEBUG_PIO
, "scsi%d: residual %d\n", HOSTNO
, c
);
1808 tmp
= NCR5380_read(STATUS_REG
);
1809 /* The phase read from the bus is valid if either REQ is (already)
1810 * asserted or if ACK hasn't been released yet. The latter applies if
1811 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1813 if ((tmp
& SR_REQ
) || ((tmp
& SR_IO
) && c
== 0))
1814 *phase
= tmp
& PHASE_MASK
;
1816 *phase
= PHASE_UNKNOWN
;
1818 if (!c
|| (*phase
== p
))
1825 * do_reset - issue a reset command
1826 * @instance: adapter to reset
1828 * Issue a reset sequence to the NCR5380 and try and get the bus
1829 * back into sane shape.
1831 * This clears the reset interrupt flag because there may be no handler for
1832 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1833 * been installed. And when in EH we may have released the ST DMA interrupt.
1836 static void do_reset(struct Scsi_Host
*instance
)
1838 unsigned long flags
;
1840 local_irq_save(flags
);
1841 NCR5380_write(TARGET_COMMAND_REG
,
1842 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
1843 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
1845 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1846 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1847 local_irq_restore(flags
);
1851 * Function : do_abort (Scsi_Host *host)
1853 * Purpose : abort the currently established nexus. Should only be
1854 * called from a routine which can drop into a
1856 * Returns : 0 on success, -1 on failure.
1859 static int do_abort(struct Scsi_Host
*instance
)
1861 unsigned char tmp
, *msgptr
, phase
;
1864 /* Request message out phase */
1865 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1868 * Wait for the target to indicate a valid phase by asserting
1869 * REQ. Once this happens, we'll have either a MSGOUT phase
1870 * and can immediately send the ABORT message, or we'll have some
1871 * other phase and will have to source/sink data.
1873 * We really don't care what value was on the bus or what value
1874 * the target sees, so we just handshake.
1877 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
))
1880 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1882 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
1883 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1885 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1887 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1893 phase
= PHASE_MSGOUT
;
1894 NCR5380_transfer_pio(instance
, &phase
, &len
, &msgptr
);
1897 * If we got here, and the command completed successfully,
1898 * we're about to go into bus free state.
1901 return len
? -1 : 0;
1904 #if defined(REAL_DMA)
1906 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1907 * unsigned char *phase, int *count, unsigned char **data)
1909 * Purpose : transfers data in given phase using either real
1912 * Inputs : instance - instance of driver, *phase - pointer to
1913 * what phase is expected, *count - pointer to number of
1914 * bytes to transfer, **data - pointer to data pointer.
1916 * Returns : -1 when different phase is entered without transferring
1917 * maximum number of bytes, 0 if all bytes or transferred or exit
1920 * Also, *phase, *count, *data are modified in place.
1925 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1926 unsigned char *phase
, int *count
,
1927 unsigned char **data
)
1929 SETUP_HOSTDATA(instance
);
1930 register int c
= *count
;
1931 register unsigned char p
= *phase
;
1932 unsigned long flags
;
1934 #if defined(CONFIG_SUN3)
1936 if (!sun3_dma_setup_done
) {
1937 pr_err("scsi%d: transfer_dma without setup!\n",
1941 hostdata
->dma_len
= c
;
1943 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1944 instance
->host_no
, (p
& SR_IO
) ? "reading" : "writing",
1945 c
, (p
& SR_IO
) ? "to" : "from", *data
);
1947 /* netbsd turns off ints here, why not be safe and do it too */
1948 local_irq_save(flags
);
1950 /* send start chain */
1951 sun3scsi_dma_start(c
, *data
);
1954 NCR5380_write(TARGET_COMMAND_REG
, 1);
1955 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1956 NCR5380_write(INITIATOR_COMMAND_REG
, 0);
1957 NCR5380_write(MODE_REG
,
1958 (NCR5380_read(MODE_REG
) | MR_DMA_MODE
| MR_ENABLE_EOP_INTR
));
1959 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1961 NCR5380_write(TARGET_COMMAND_REG
, 0);
1962 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1963 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_DATA
);
1964 NCR5380_write(MODE_REG
,
1965 (NCR5380_read(MODE_REG
) | MR_DMA_MODE
| MR_ENABLE_EOP_INTR
));
1966 NCR5380_write(START_DMA_SEND_REG
, 0);
1969 #ifdef SUN3_SCSI_VME
1970 dregs
->csr
|= CSR_DMA_ENABLE
;
1973 local_irq_restore(flags
);
1975 sun3_dma_active
= 1;
1977 #else /* !defined(CONFIG_SUN3) */
1978 register unsigned char *d
= *data
;
1981 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1986 if (hostdata
->read_overruns
&& (p
& SR_IO
))
1987 c
-= hostdata
->read_overruns
;
1989 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1990 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1991 c
, (p
& SR_IO
) ? "to" : "from", d
);
1993 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1996 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
1997 #endif /* def REAL_DMA */
1999 if (!(hostdata
->flags
& FLAG_LATE_DMA_SETUP
)) {
2000 /* On the Medusa, it is a must to initialize the DMA before
2001 * starting the NCR. This is also the cleaner way for the TT.
2003 local_irq_save(flags
);
2004 hostdata
->dma_len
= (p
& SR_IO
) ?
2005 NCR5380_dma_read_setup(instance
, d
, c
) :
2006 NCR5380_dma_write_setup(instance
, d
, c
);
2007 local_irq_restore(flags
);
2011 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
2013 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
2014 NCR5380_write(START_DMA_SEND_REG
, 0);
2017 if (hostdata
->flags
& FLAG_LATE_DMA_SETUP
) {
2018 /* On the Falcon, the DMA setup must be done after the last */
2019 /* NCR access, else the DMA setup gets trashed!
2021 local_irq_save(flags
);
2022 hostdata
->dma_len
= (p
& SR_IO
) ?
2023 NCR5380_dma_read_setup(instance
, d
, c
) :
2024 NCR5380_dma_write_setup(instance
, d
, c
);
2025 local_irq_restore(flags
);
2027 #endif /* !defined(CONFIG_SUN3) */
2031 #endif /* defined(REAL_DMA) */
2034 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2036 * Purpose : run through the various SCSI phases and do as the target
2037 * directs us to. Operates on the currently connected command,
2038 * instance->connected.
2040 * Inputs : instance, instance for which we are doing commands
2042 * Side effects : SCSI things happen, the disconnected queue will be
2043 * modified if a command disconnects, *instance->connected will
2046 * XXX Note : we need to watch for bus free or a reset condition here
2047 * to recover from an unexpected bus free condition.
2050 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
2052 SETUP_HOSTDATA(instance
);
2053 unsigned long flags
;
2054 unsigned char msgout
= NOP
;
2057 #if defined(REAL_DMA)
2060 unsigned char *data
;
2061 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
2062 struct scsi_cmnd
*cmd
= (struct scsi_cmnd
*) hostdata
->connected
;
2064 #ifdef SUN3_SCSI_VME
2065 dregs
->csr
|= CSR_INTR
;
2069 tmp
= NCR5380_read(STATUS_REG
);
2070 /* We only have a valid SCSI phase when REQ is asserted */
2072 phase
= (tmp
& PHASE_MASK
);
2073 if (phase
!= old_phase
) {
2075 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
2077 #if defined(CONFIG_SUN3)
2078 if (phase
== PHASE_CMDOUT
) {
2079 #if defined(REAL_DMA)
2081 unsigned long count
;
2083 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2084 count
= cmd
->SCp
.buffer
->length
;
2085 d
= sg_virt(cmd
->SCp
.buffer
);
2087 count
= cmd
->SCp
.this_residual
;
2090 /* this command setup for dma yet? */
2091 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= cmd
)) {
2092 if (cmd
->request
->cmd_type
== REQ_TYPE_FS
) {
2093 sun3scsi_dma_setup(d
, count
,
2094 rq_data_dir(cmd
->request
));
2095 sun3_dma_setup_done
= cmd
;
2099 #ifdef SUN3_SCSI_VME
2100 dregs
->csr
|= CSR_INTR
;
2103 #endif /* CONFIG_SUN3 */
2105 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2106 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2108 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2110 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
2112 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2120 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2121 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2122 "aborted\n", HOSTNO
);
2125 cmd
->result
= DID_ERROR
<< 16;
2126 cmd
->scsi_done(cmd
);
2131 * If there is no room left in the current buffer in the
2132 * scatter-gather list, move onto the next one.
2135 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2137 --cmd
->SCp
.buffers_residual
;
2138 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2139 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
2140 /* ++roman: Try to merge some scatter-buffers if
2141 * they are at contiguous physical addresses.
2143 merge_contiguous_buffers(cmd
);
2144 dprintk(NDEBUG_INFORMATION
, "scsi%d: %d bytes and %d buffers left\n",
2145 HOSTNO
, cmd
->SCp
.this_residual
,
2146 cmd
->SCp
.buffers_residual
);
2150 * The preferred transfer method is going to be
2151 * PSEUDO-DMA for systems that are strictly PIO,
2152 * since we can let the hardware do the handshaking.
2154 * For this to work, we need to know the transfersize
2155 * ahead of time, since the pseudo-DMA code will sit
2156 * in an unconditional loop.
2159 /* ++roman: I suggest, this should be
2161 * instead of leaving REAL_DMA out.
2164 #if defined(REAL_DMA)
2165 #if !defined(CONFIG_SUN3)
2167 if (!cmd
->device
->borken
)
2169 transfersize
= NCR5380_dma_xfer_len(instance
, cmd
, phase
);
2171 if (transfersize
>= DMA_MIN_SIZE
) {
2173 cmd
->SCp
.phase
= phase
;
2174 if (NCR5380_transfer_dma(instance
, &phase
,
2175 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
2177 * If the watchdog timer fires, all future
2178 * accesses to this device will use the
2180 scmd_printk(KERN_INFO
, cmd
,
2181 "switching to slow handshake\n");
2182 cmd
->device
->borken
= 1;
2185 cmd
->result
= DID_ERROR
<< 16;
2186 cmd
->scsi_done(cmd
);
2187 /* XXX - need to source or sink data here, as appropriate */
2190 /* ++roman: When using real DMA,
2191 * information_transfer() should return after
2192 * starting DMA since it has nothing more to
2197 cmd
->SCp
.this_residual
-= transfersize
- len
;
2201 #endif /* defined(REAL_DMA) */
2202 NCR5380_transfer_pio(instance
, &phase
,
2203 (int *)&cmd
->SCp
.this_residual
,
2204 (unsigned char **)&cmd
->SCp
.ptr
);
2205 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2206 /* if we had intended to dma that command clear it */
2207 if (sun3_dma_setup_done
== cmd
)
2208 sun3_dma_setup_done
= NULL
;
2214 NCR5380_write(SELECT_ENABLE_REG
, 0); /* disable reselects */
2215 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2216 cmd
->SCp
.Message
= tmp
;
2220 * Linking lets us reduce the time required to get the
2221 * next command out to the device, hopefully this will
2222 * mean we don't waste another revolution due to the delays
2223 * required by ARBITRATION and another SELECTION.
2225 * In the current implementation proposal, low level drivers
2226 * merely have to start the next command, pointed to by
2227 * next_link, done() is called as with unlinked commands.
2230 case LINKED_CMD_COMPLETE
:
2231 case LINKED_FLG_CMD_COMPLETE
:
2232 /* Accept message by clearing ACK */
2233 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2235 dprintk(NDEBUG_LINKED
, "scsi%d: target %d lun %llu linked command "
2236 "complete.\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2238 /* Enable reselect interrupts */
2239 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2241 * Sanity check : A linked command should only terminate
2242 * with one of these messages if there are more linked
2243 * commands available.
2246 if (!cmd
->next_link
) {
2247 printk(KERN_NOTICE
"scsi%d: target %d lun %llu "
2248 "linked command complete, no next_link\n",
2249 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2255 initialize_SCp(cmd
->next_link
);
2256 /* The next command is still part of this process; copy it
2257 * and don't free it! */
2258 cmd
->next_link
->tag
= cmd
->tag
;
2259 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2260 dprintk(NDEBUG_LINKED
, "scsi%d: target %d lun %llu linked request "
2261 "done, calling scsi_done().\n",
2262 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2263 cmd
->scsi_done(cmd
);
2264 cmd
= hostdata
->connected
;
2266 #endif /* def LINKED */
2268 case COMMAND_COMPLETE
:
2269 /* Accept message by clearing ACK */
2270 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2271 dprintk(NDEBUG_QUEUES
, "scsi%d: command for target %d, lun %llu "
2272 "completed\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2274 local_irq_save(flags
);
2275 hostdata
->retain_dma_intr
++;
2276 hostdata
->connected
= NULL
;
2279 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2280 /* Turn a QUEUE FULL status into BUSY, I think the
2281 * mid level cannot handle QUEUE FULL :-( (The
2282 * command is retried after BUSY). Also update our
2283 * queue size to the number of currently issued
2286 /* ++Andreas: the mid level code knows about
2288 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][cmd
->device
->lun
];
2289 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu returned "
2290 "QUEUE_FULL after %d commands\n",
2291 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2293 if (ta
->queue_size
> ta
->nr_allocated
)
2294 ta
->nr_allocated
= ta
->queue_size
;
2297 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2299 /* Enable reselect interrupts */
2300 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2303 * I'm not sure what the correct thing to do here is :
2305 * If the command that just executed is NOT a request
2306 * sense, the obvious thing to do is to set the result
2307 * code to the values of the stored parameters.
2309 * If it was a REQUEST SENSE command, we need some way to
2310 * differentiate between the failure code of the original
2311 * and the failure code of the REQUEST sense - the obvious
2312 * case is success, where we fall through and leave the
2313 * result code unchanged.
2315 * The non-obvious place is where the REQUEST SENSE failed
2318 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2319 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2320 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2321 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2323 if ((cmd
->cmnd
[0] == REQUEST_SENSE
) &&
2324 hostdata
->ses
.cmd_len
) {
2325 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
2326 hostdata
->ses
.cmd_len
= 0 ;
2329 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2330 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2331 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
2333 dprintk(NDEBUG_AUTOSENSE
, "scsi%d: performing request sense\n", HOSTNO
);
2335 LIST(cmd
,hostdata
->issue_queue
);
2336 SET_NEXT(cmd
, hostdata
->issue_queue
);
2337 hostdata
->issue_queue
= (struct scsi_cmnd
*) cmd
;
2338 dprintk(NDEBUG_QUEUES
, "scsi%d: REQUEST SENSE added to head of "
2339 "issue queue\n", H_NO(cmd
));
2341 cmd
->scsi_done(cmd
);
2344 local_irq_restore(flags
);
2346 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2348 * Restore phase bits to 0 so an interrupted selection,
2349 * arbitration can resume.
2351 NCR5380_write(TARGET_COMMAND_REG
, 0);
2353 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2356 local_irq_save(flags
);
2357 hostdata
->retain_dma_intr
--;
2358 /* ++roman: For Falcon SCSI, release the lock on the
2359 * ST-DMA here if no other commands are waiting on the
2360 * disconnected queue.
2362 maybe_release_dma_irq(instance
);
2363 local_irq_restore(flags
);
2365 case MESSAGE_REJECT
:
2366 /* Accept message by clearing ACK */
2367 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2368 /* Enable reselect interrupts */
2369 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2370 switch (hostdata
->last_message
) {
2371 case HEAD_OF_QUEUE_TAG
:
2372 case ORDERED_QUEUE_TAG
:
2373 case SIMPLE_QUEUE_TAG
:
2374 /* The target obviously doesn't support tagged
2375 * queuing, even though it announced this ability in
2376 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2377 * clear 'tagged_supported' and lock the LUN, since
2378 * the command is treated as untagged further on.
2380 cmd
->device
->tagged_supported
= 0;
2381 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2382 cmd
->tag
= TAG_NONE
;
2383 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu rejected "
2384 "QUEUE_TAG message; tagged queuing "
2386 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2391 /* Accept message by clearing ACK */
2392 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2393 local_irq_save(flags
);
2394 LIST(cmd
,hostdata
->disconnected_queue
);
2395 SET_NEXT(cmd
, hostdata
->disconnected_queue
);
2396 hostdata
->connected
= NULL
;
2397 hostdata
->disconnected_queue
= cmd
;
2398 local_irq_restore(flags
);
2399 dprintk(NDEBUG_QUEUES
, "scsi%d: command for target %d lun %llu was "
2400 "moved from connected to the "
2401 "disconnected_queue\n", HOSTNO
,
2402 cmd
->device
->id
, cmd
->device
->lun
);
2404 * Restore phase bits to 0 so an interrupted selection,
2405 * arbitration can resume.
2407 NCR5380_write(TARGET_COMMAND_REG
, 0);
2409 /* Enable reselect interrupts */
2410 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2411 /* Wait for bus free to avoid nasty timeouts */
2412 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2414 #ifdef SUN3_SCSI_VME
2415 dregs
->csr
|= CSR_DMA_ENABLE
;
2419 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2420 * operation, in violation of the SCSI spec so we can safely
2421 * ignore SAVE/RESTORE pointers calls.
2423 * Unfortunately, some disks violate the SCSI spec and
2424 * don't issue the required SAVE_POINTERS message before
2425 * disconnecting, and we have to break spec to remain
2429 case RESTORE_POINTERS
:
2430 /* Accept message by clearing ACK */
2431 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2432 /* Enable reselect interrupts */
2433 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2435 case EXTENDED_MESSAGE
:
2437 * Extended messages are sent in the following format :
2439 * 0 EXTENDED_MESSAGE == 1
2440 * 1 length (includes one byte for code, doesn't
2441 * include first two bytes)
2443 * 3..length+1 arguments
2445 * Start the extended message buffer with the EXTENDED_MESSAGE
2446 * byte, since spi_print_msg() wants the whole thing.
2448 extended_msg
[0] = EXTENDED_MESSAGE
;
2449 /* Accept first byte by clearing ACK */
2450 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2452 dprintk(NDEBUG_EXTENDED
, "scsi%d: receiving extended message\n", HOSTNO
);
2455 data
= extended_msg
+ 1;
2456 phase
= PHASE_MSGIN
;
2457 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2458 dprintk(NDEBUG_EXTENDED
, "scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2459 (int)extended_msg
[1], (int)extended_msg
[2]);
2461 if (!len
&& extended_msg
[1] <=
2462 (sizeof(extended_msg
) - 1)) {
2463 /* Accept third byte by clearing ACK */
2464 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2465 len
= extended_msg
[1] - 1;
2466 data
= extended_msg
+ 3;
2467 phase
= PHASE_MSGIN
;
2469 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2470 dprintk(NDEBUG_EXTENDED
, "scsi%d: message received, residual %d\n",
2473 switch (extended_msg
[2]) {
2476 case EXTENDED_MODIFY_DATA_POINTER
:
2477 case EXTENDED_EXTENDED_IDENTIFY
:
2481 printk(KERN_NOTICE
"scsi%d: error receiving "
2482 "extended message\n", HOSTNO
);
2485 printk(KERN_NOTICE
"scsi%d: extended message "
2486 "code %02x length %d is too long\n",
2487 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2490 /* Fall through to reject message */
2493 * If we get something weird that we aren't expecting,
2498 printk(KERN_INFO
"scsi%d: rejecting message ",
2500 spi_print_msg(extended_msg
);
2502 } else if (tmp
!= EXTENDED_MESSAGE
)
2503 scmd_printk(KERN_INFO
, cmd
,
2504 "rejecting unknown message %02x\n",
2507 scmd_printk(KERN_INFO
, cmd
,
2508 "rejecting unknown extended message code %02x, length %d\n",
2509 extended_msg
[1], extended_msg
[0]);
2511 msgout
= MESSAGE_REJECT
;
2512 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2514 } /* switch (tmp) */
2519 hostdata
->last_message
= msgout
;
2520 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2521 if (msgout
== ABORT
) {
2522 local_irq_save(flags
);
2526 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2528 hostdata
->connected
= NULL
;
2529 cmd
->result
= DID_ERROR
<< 16;
2530 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2531 maybe_release_dma_irq(instance
);
2532 local_irq_restore(flags
);
2533 cmd
->scsi_done(cmd
);
2542 * XXX for performance reasons, on machines with a
2543 * PSEUDO-DMA architecture we should probably
2544 * use the dma transfer function.
2546 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2551 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2552 cmd
->SCp
.Status
= tmp
;
2555 printk("scsi%d: unknown phase\n", HOSTNO
);
2556 NCR5380_dprint(NDEBUG_ANY
, instance
);
2557 } /* switch(phase) */
2559 NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
2565 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2567 * Purpose : does reselection, initializing the instance->connected
2568 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2569 * nexus has been reestablished,
2571 * Inputs : instance - this instance of the NCR5380.
2576 /* it might eventually prove necessary to do a dma setup on
2577 reselection, but it doesn't seem to be needed now -- sam */
2579 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2581 SETUP_HOSTDATA(instance
);
2582 unsigned char target_mask
;
2587 unsigned char msg
[3];
2588 int __maybe_unused len
;
2589 unsigned char __maybe_unused
*data
, __maybe_unused phase
;
2590 struct scsi_cmnd
*tmp
= NULL
, *prev
;
2593 * Disable arbitration, etc. since the host adapter obviously
2594 * lost, and tell an interrupted NCR5380_select() to restart.
2597 NCR5380_write(MODE_REG
, MR_BASE
);
2599 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2601 dprintk(NDEBUG_RESELECTION
, "scsi%d: reselect\n", HOSTNO
);
2604 * At this point, we have detected that our SCSI ID is on the bus,
2605 * SEL is true and BSY was false for at least one bus settle delay
2608 * We must assert BSY ourselves, until the target drops the SEL
2612 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2614 while (NCR5380_read(STATUS_REG
) & SR_SEL
)
2616 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2619 * Wait for target to go into MSGIN.
2622 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
2625 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2626 /* acknowledge toggle to MSGIN */
2627 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(PHASE_MSGIN
));
2629 /* peek at the byte without really hitting the bus */
2630 msg
[0] = NCR5380_read(CURRENT_SCSI_DATA_REG
);
2634 phase
= PHASE_MSGIN
;
2635 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2638 if (!(msg
[0] & 0x80)) {
2639 printk(KERN_DEBUG
"scsi%d: expecting IDENTIFY message, got ", HOSTNO
);
2644 lun
= (msg
[0] & 0x07);
2646 #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
2647 /* If the phase is still MSGIN, the target wants to send some more
2648 * messages. In case it supports tagged queuing, this is probably a
2649 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2652 if (phase
== PHASE_MSGIN
&& (hostdata
->flags
& FLAG_TAGGED_QUEUING
)) {
2653 /* Accept previous IDENTIFY message by clearing ACK */
2654 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2657 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2658 msg
[1] == SIMPLE_QUEUE_TAG
)
2660 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at "
2661 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2666 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2667 * just reestablished, and remove it from the disconnected queue.
2670 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2671 tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
2672 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== tmp
->device
->lun
)
2674 && (tag
== tmp
->tag
)
2678 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
2679 SET_NEXT(prev
, NEXT(tmp
));
2681 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, NEXT(tmp
));
2682 hostdata
->disconnected_queue
= NEXT(tmp
);
2684 SET_NEXT(tmp
, NULL
);
2690 printk(KERN_WARNING
"scsi%d: warning: target bitmask %02x lun %d "
2694 "not in disconnected_queue.\n",
2695 HOSTNO
, target_mask
, lun
2701 * Since we have an established nexus that we can't do anything
2702 * with, we must abort it.
2708 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2709 /* engage dma setup for the command we just saw */
2712 unsigned long count
;
2714 if (!tmp
->SCp
.this_residual
&& tmp
->SCp
.buffers_residual
) {
2715 count
= tmp
->SCp
.buffer
->length
;
2716 d
= sg_virt(tmp
->SCp
.buffer
);
2718 count
= tmp
->SCp
.this_residual
;
2721 /* setup this command for dma if not already */
2722 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= tmp
)) {
2723 sun3scsi_dma_setup(d
, count
, rq_data_dir(tmp
->request
));
2724 sun3_dma_setup_done
= tmp
;
2728 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2731 /* Accept message by clearing ACK */
2732 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2734 #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
2735 /* If the phase is still MSGIN, the target wants to send some more
2736 * messages. In case it supports tagged queuing, this is probably a
2737 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2740 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2741 /* Accept previous IDENTIFY message by clearing ACK */
2742 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2745 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2746 msg
[1] == SIMPLE_QUEUE_TAG
)
2748 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n"
2749 HOSTNO
, target_mask
, lun
, tag
);
2753 hostdata
->connected
= tmp
;
2754 dprintk(NDEBUG_RESELECTION
, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2755 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
, tmp
->tag
);
2760 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
2762 * Purpose : abort a command
2764 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
2765 * host byte of the result field to, if zero DID_ABORTED is
2768 * Returns : SUCCESS - success, FAILED on failure.
2770 * XXX - there is no way to abort the command that is currently
2771 * connected, you have to wait for it to complete. If this is
2772 * a problem, we could implement longjmp() / setjmp(), setjmp()
2773 * called where the loop started in NCR5380_main().
2777 int NCR5380_abort(struct scsi_cmnd
*cmd
)
2779 struct Scsi_Host
*instance
= cmd
->device
->host
;
2780 SETUP_HOSTDATA(instance
);
2781 struct scsi_cmnd
*tmp
, **prev
;
2782 unsigned long flags
;
2784 scmd_printk(KERN_NOTICE
, cmd
, "aborting command\n");
2786 NCR5380_print_status(instance
);
2788 local_irq_save(flags
);
2790 dprintk(NDEBUG_ABORT
, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2791 NCR5380_read(BUS_AND_STATUS_REG
),
2792 NCR5380_read(STATUS_REG
));
2796 * Case 1 : If the command is the currently executing command,
2797 * we'll set the aborted flag and return control so that
2798 * information transfer routine can exit cleanly.
2801 if (hostdata
->connected
== cmd
) {
2803 dprintk(NDEBUG_ABORT
, "scsi%d: aborting connected command\n", HOSTNO
);
2805 * We should perform BSY checking, and make sure we haven't slipped
2809 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2811 * Since we can't change phases until we've completed the current
2812 * handshake, we have to source or sink a byte of data if the current
2813 * phase is not MSGOUT.
2817 * Return control to the executing NCR drive so we can clear the
2818 * aborted flag and get back into our main loop.
2821 if (do_abort(instance
) == 0) {
2822 hostdata
->connected
= NULL
;
2823 cmd
->result
= DID_ABORT
<< 16;
2827 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2829 maybe_release_dma_irq(instance
);
2830 local_irq_restore(flags
);
2831 cmd
->scsi_done(cmd
);
2834 local_irq_restore(flags
);
2835 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2842 * Case 2 : If the command hasn't been issued yet, we simply remove it
2843 * from the issue queue.
2845 for (prev
= (struct scsi_cmnd
**)&(hostdata
->issue_queue
),
2846 tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
2847 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2849 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2850 (*prev
) = NEXT(tmp
);
2851 SET_NEXT(tmp
, NULL
);
2852 tmp
->result
= DID_ABORT
<< 16;
2853 maybe_release_dma_irq(instance
);
2854 local_irq_restore(flags
);
2855 dprintk(NDEBUG_ABORT
, "scsi%d: abort removed command from issue queue.\n",
2857 /* Tagged queuing note: no tag to free here, hasn't been assigned
2859 tmp
->scsi_done(tmp
);
2865 * Case 3 : If any commands are connected, we're going to fail the abort
2866 * and let the high level SCSI driver retry at a later time or
2869 * Timeouts, and therefore aborted commands, will be highly unlikely
2870 * and handling them cleanly in this situation would make the common
2871 * case of noresets less efficient, and would pollute our code. So,
2875 if (hostdata
->connected
) {
2876 local_irq_restore(flags
);
2877 dprintk(NDEBUG_ABORT
, "scsi%d: abort failed, command connected.\n", HOSTNO
);
2882 * Case 4: If the command is currently disconnected from the bus, and
2883 * there are no connected commands, we reconnect the I_T_L or
2884 * I_T_L_Q nexus associated with it, go into message out, and send
2887 * This case is especially ugly. In order to reestablish the nexus, we
2888 * need to call NCR5380_select(). The easiest way to implement this
2889 * function was to abort if the bus was busy, and let the interrupt
2890 * handler triggered on the SEL for reselect take care of lost arbitrations
2891 * where necessary, meaning interrupts need to be enabled.
2893 * When interrupts are enabled, the queues may change - so we
2894 * can't remove it from the disconnected queue before selecting it
2895 * because that could cause a failure in hashing the nexus if that
2896 * device reselected.
2898 * Since the queues may change, we can't use the pointers from when we
2901 * So, we must first locate the command, and if NCR5380_select()
2902 * succeeds, then issue the abort, relocate the command and remove
2903 * it from the disconnected queue.
2906 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; tmp
;
2909 local_irq_restore(flags
);
2910 dprintk(NDEBUG_ABORT
, "scsi%d: aborting disconnected command.\n", HOSTNO
);
2912 if (NCR5380_select(instance
, cmd
))
2915 dprintk(NDEBUG_ABORT
, "scsi%d: nexus reestablished.\n", HOSTNO
);
2919 local_irq_save(flags
);
2920 for (prev
= (struct scsi_cmnd
**)&(hostdata
->disconnected_queue
),
2921 tmp
= (struct scsi_cmnd
*)hostdata
->disconnected_queue
;
2922 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2924 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2926 SET_NEXT(tmp
, NULL
);
2927 tmp
->result
= DID_ABORT
<< 16;
2928 /* We must unlock the tag/LUN immediately here, since the
2929 * target goes to BUS FREE and doesn't send us another
2930 * message (COMMAND_COMPLETE or the like)
2935 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2937 maybe_release_dma_irq(instance
);
2938 local_irq_restore(flags
);
2939 tmp
->scsi_done(tmp
);
2946 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2947 * possible at all) At least, we should check if the lock could be
2948 * released after the abort, in case it is kept due to some bug.
2950 maybe_release_dma_irq(instance
);
2951 local_irq_restore(flags
);
2954 * Case 5 : If we reached this point, the command was not found in any of
2957 * We probably reached this point because of an unlikely race condition
2958 * between the command completing successfully and the abortion code,
2959 * so we won't panic, but we will notify the user in case something really
2963 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO
);
2970 * NCR5380_bus_reset - reset the SCSI bus
2971 * @cmd: SCSI command undergoing EH
2976 static int NCR5380_bus_reset(struct scsi_cmnd
*cmd
)
2978 struct Scsi_Host
*instance
= cmd
->device
->host
;
2979 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2981 unsigned long flags
;
2983 local_irq_save(flags
);
2985 #if (NDEBUG & NDEBUG_ANY)
2986 scmd_printk(KERN_INFO
, cmd
, "performing bus reset\n");
2987 NCR5380_print_status(instance
);
2992 /* reset NCR registers */
2993 NCR5380_write(MODE_REG
, MR_BASE
);
2994 NCR5380_write(TARGET_COMMAND_REG
, 0);
2995 NCR5380_write(SELECT_ENABLE_REG
, 0);
2997 /* After the reset, there are no more connected or disconnected commands
2998 * and no busy units; so clear the low-level status here to avoid
2999 * conflicts when the mid-level code tries to wake up the affected
3003 if (hostdata
->issue_queue
)
3004 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd
));
3005 if (hostdata
->connected
)
3006 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted a connected command\n", H_NO(cmd
));
3007 if (hostdata
->disconnected_queue
)
3008 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd
));
3010 hostdata
->issue_queue
= NULL
;
3011 hostdata
->connected
= NULL
;
3012 hostdata
->disconnected_queue
= NULL
;
3014 free_all_tags(hostdata
);
3016 for (i
= 0; i
< 8; ++i
)
3017 hostdata
->busy
[i
] = 0;
3019 hostdata
->dma_len
= 0;
3022 maybe_release_dma_irq(instance
);
3023 local_irq_restore(flags
);