2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * Note that these routines also work with NR53c400 family chips.
8 * Copyright 1993, Drew Eckhardt
10 * (Unix and Linux consulting and custom programming)
14 * For more information, please consult
17 * SCSI Protocol Controller
20 * NCR Microelectronics
21 * 1635 Aeroplaza Drive
22 * Colorado Springs, CO 80916
28 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
31 * - Some of the debug statements were incorrect (undefined variables and the
32 * like). I fixed that.
34 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
35 * possible DMA transfer size should also happen for REAL_DMA. I added this
36 * in the #if statement.
38 * - When using real DMA, information_transfer() should return in a DATAOUT
39 * phase after starting the DMA. It has nothing more to do.
41 * - The interrupt service routine should run main after end of DMA, too (not
42 * only after RESELECTION interrupts). Additionally, it should _not_ test
43 * for more interrupts after running main, since a DMA process may have
44 * been started and interrupts are turned on now. The new int could happen
45 * inside the execution of NCR5380_intr(), leading to recursive
48 * - I've added a function merge_contiguous_buffers() that tries to
49 * merge scatter-gather buffers that are located at contiguous
50 * physical addresses and can be processed with the same DMA setup.
51 * Since most scatter-gather operations work on a page (4K) of
52 * 4 buffers (1K), in more than 90% of all cases three interrupts and
53 * DMA setup actions are saved.
55 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
56 * and USLEEP, because these were messing up readability and will never be
57 * needed for Atari SCSI.
59 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
60 * stuff), and 'main' is executed in a bottom half if awoken by an
63 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
64 * constructs. In my eyes, this made the source rather unreadable, so I
65 * finally replaced that by the *_PRINTK() macros.
69 /* Adapted for the sun3 by Sam Creasey. */
71 #if (NDEBUG & NDEBUG_LISTS)
74 printk("LINE:%d Adding %p to %p\n", \
75 __LINE__, (void*)(x), (void*)(y)); \
79 #define REMOVE(w, x, y, z) \
81 printk("LINE:%d Removing: %p->%p %p->%p \n", \
82 __LINE__, (void*)(w), (void*)(x), \
83 (void*)(y), (void*)(z)); \
89 #define REMOVE(w,x,y,z)
95 * This is a generic 5380 driver. To use it on a different platform,
96 * one simply writes appropriate system specific macros (ie, data
97 * transfer - some PC's will use the I/O bus, 68K's must use
98 * memory mapped) and drops this file in their 'C' wrapper.
100 * As far as command queueing, two queues are maintained for
101 * each 5380 in the system - commands that haven't been issued yet,
102 * and commands that are currently executing. This means that an
103 * unlimited number of commands may be queued, letting
104 * more commands propagate from the higher driver levels giving higher
105 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
106 * allowing multiple commands to propagate all the way to a SCSI-II device
107 * while a command is already executing.
110 * Issues specific to the NCR5380 :
112 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
113 * piece of hardware that requires you to sit in a loop polling for
114 * the REQ signal as long as you are connected. Some devices are
115 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
116 * while doing long seek operations. [...] These
117 * broken devices are the exception rather than the rule and I'd rather
118 * spend my time optimizing for the normal case.
122 * At the heart of the design is a coroutine, NCR5380_main,
123 * which is started from a workqueue for each NCR5380 host in the
124 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
125 * removing the commands from the issue queue and calling
126 * NCR5380_select() if a nexus is not established.
128 * Once a nexus is established, the NCR5380_information_transfer()
129 * phase goes through the various phases as instructed by the target.
130 * if the target goes into MSG IN and sends a DISCONNECT message,
131 * the command structure is placed into the per instance disconnected
132 * queue, and NCR5380_main tries to find more work. If the target is
133 * idle for too long, the system will try to sleep.
135 * If a command has disconnected, eventually an interrupt will trigger,
136 * calling NCR5380_intr() which will in turn call NCR5380_reselect
137 * to reestablish a nexus. This will run main if necessary.
139 * On command termination, the done function will be called as
142 * SCSI pointers are maintained in the SCp field of SCSI command
143 * structures, being initialized after the command is connected
144 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
145 * Note that in violation of the standard, an implicit SAVE POINTERS operation
146 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
151 * This file a skeleton Linux SCSI driver for the NCR 5380 series
152 * of chips. To use it, you write an architecture specific functions
153 * and macros and include this file in your driver.
155 * These macros control options :
156 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
157 * for commands that return with a CHECK CONDITION status.
159 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
162 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
164 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
166 * These macros MUST be defined :
168 * NCR5380_read(register) - read from the specified register
170 * NCR5380_write(register, value) - write to the specific register
172 * NCR5380_implementation_fields - additional fields needed for this
173 * specific implementation of the NCR5380
175 * Either real DMA *or* pseudo DMA may be implemented
177 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
178 * Note that the DMA setup functions should return the number of bytes
179 * that they were able to program the controller for.
181 * Also note that generic i386/PC versions of these macros are
182 * available as NCR5380_i386_dma_write_setup,
183 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
185 * NCR5380_dma_write_setup(instance, src, count) - initialize
186 * NCR5380_dma_read_setup(instance, dst, count) - initialize
187 * NCR5380_dma_residual(instance); - residual count
190 * NCR5380_pwrite(instance, src, count)
191 * NCR5380_pread(instance, dst, count);
193 * The generic driver is initialized by calling NCR5380_init(instance),
194 * after setting the appropriate host specific fields and ID. If the
195 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
196 * possible) function may be used.
199 #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
200 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
201 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble)
203 #define HOSTNO instance->host_no
205 static int do_abort(struct Scsi_Host
*);
206 static void do_reset(struct Scsi_Host
*);
211 * Functions for handling tagged queuing
212 * =====================================
214 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
216 * Using consecutive numbers for the tags is no good idea in my eyes. There
217 * could be wrong re-usings if the counter (8 bit!) wraps and some early
218 * command has been preempted for a long time. My solution: a bitfield for
219 * remembering used tags.
221 * There's also the problem that each target has a certain queue size, but we
222 * cannot know it in advance :-( We just see a QUEUE_FULL status being
223 * returned. So, in this case, the driver internal queue size assumption is
224 * reduced to the number of active tags if QUEUE_FULL is returned by the
227 * We're also not allowed running tagged commands as long as an untagged
228 * command is active. And REQUEST SENSE commands after a contingent allegiance
229 * condition _must_ be untagged. To keep track whether an untagged command has
230 * been issued, the host->busy array is still employed, as it is without
231 * support for tagged queuing.
233 * One could suspect that there are possible race conditions between
234 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
235 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
236 * which already guaranteed to be running at most once. It is also the only
237 * place where tags/LUNs are allocated. So no other allocation can slip
238 * between that pair, there could only happen a reselection, which can free a
239 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
240 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
243 static void __init
init_tags(struct NCR5380_hostdata
*hostdata
)
246 struct tag_alloc
*ta
;
248 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
251 for (target
= 0; target
< 8; ++target
) {
252 for (lun
= 0; lun
< 8; ++lun
) {
253 ta
= &hostdata
->TagAlloc
[target
][lun
];
254 bitmap_zero(ta
->allocated
, MAX_TAGS
);
255 ta
->nr_allocated
= 0;
256 /* At the beginning, assume the maximum queue size we could
257 * support (MAX_TAGS). This value will be decreased if the target
258 * returns QUEUE_FULL status.
260 ta
->queue_size
= MAX_TAGS
;
266 /* Check if we can issue a command to this LUN: First see if the LUN is marked
267 * busy by an untagged command. If the command should use tagged queuing, also
268 * check that there is a free tag and the target's queue won't overflow. This
269 * function should be called with interrupts disabled to avoid race
273 static int is_lun_busy(struct scsi_cmnd
*cmd
, int should_be_tagged
)
275 u8 lun
= cmd
->device
->lun
;
276 struct Scsi_Host
*instance
= cmd
->device
->host
;
277 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
279 if (hostdata
->busy
[cmd
->device
->id
] & (1 << lun
))
281 if (!should_be_tagged
||
282 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
283 !cmd
->device
->tagged_supported
)
285 if (hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].nr_allocated
>=
286 hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].queue_size
) {
287 dsprintk(NDEBUG_TAGS
, instance
, "target %d lun %d: no free tags\n",
295 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
296 * must be called before!), or reserve the LUN in 'busy' if the command is
300 static void cmd_get_tag(struct scsi_cmnd
*cmd
, int should_be_tagged
)
302 u8 lun
= cmd
->device
->lun
;
303 struct Scsi_Host
*instance
= cmd
->device
->host
;
304 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
306 /* If we or the target don't support tagged queuing, allocate the LUN for
307 * an untagged command.
309 if (!should_be_tagged
||
310 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
311 !cmd
->device
->tagged_supported
) {
313 hostdata
->busy
[cmd
->device
->id
] |= (1 << lun
);
314 dsprintk(NDEBUG_TAGS
, instance
, "target %d lun %d now allocated by untagged command\n",
317 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
319 cmd
->tag
= find_first_zero_bit(ta
->allocated
, MAX_TAGS
);
320 set_bit(cmd
->tag
, ta
->allocated
);
322 dsprintk(NDEBUG_TAGS
, instance
, "using tag %d for target %d lun %d (%d tags allocated)\n",
323 cmd
->tag
, scmd_id(cmd
), lun
, ta
->nr_allocated
);
328 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
332 static void cmd_free_tag(struct scsi_cmnd
*cmd
)
334 u8 lun
= cmd
->device
->lun
;
335 struct Scsi_Host
*instance
= cmd
->device
->host
;
336 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
338 if (cmd
->tag
== TAG_NONE
) {
339 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << lun
);
340 dsprintk(NDEBUG_TAGS
, instance
, "target %d lun %d untagged cmd freed\n",
342 } else if (cmd
->tag
>= MAX_TAGS
) {
343 shost_printk(KERN_NOTICE
, instance
,
344 "trying to free bad tag %d!\n", cmd
->tag
);
346 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
347 clear_bit(cmd
->tag
, ta
->allocated
);
349 dsprintk(NDEBUG_TAGS
, instance
, "freed tag %d for target %d lun %d\n",
350 cmd
->tag
, scmd_id(cmd
), lun
);
355 static void free_all_tags(struct NCR5380_hostdata
*hostdata
)
358 struct tag_alloc
*ta
;
360 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
363 for (target
= 0; target
< 8; ++target
) {
364 for (lun
= 0; lun
< 8; ++lun
) {
365 ta
= &hostdata
->TagAlloc
[target
][lun
];
366 bitmap_zero(ta
->allocated
, MAX_TAGS
);
367 ta
->nr_allocated
= 0;
372 #endif /* SUPPORT_TAGS */
376 * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd )
378 * Purpose: Try to merge several scatter-gather requests into one DMA
379 * transfer. This is possible if the scatter buffers lie on
380 * physical contiguous addresses.
382 * Parameters: struct scsi_cmnd *cmd
383 * The command to work on. The first scatter buffer's data are
384 * assumed to be already transferred into ptr/this_residual.
387 static void merge_contiguous_buffers(struct scsi_cmnd
*cmd
)
389 #if !defined(CONFIG_SUN3)
390 unsigned long endaddr
;
391 #if (NDEBUG & NDEBUG_MERGING)
392 unsigned long oldlen
= cmd
->SCp
.this_residual
;
396 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
397 cmd
->SCp
.buffers_residual
&&
398 virt_to_phys(sg_virt(&cmd
->SCp
.buffer
[1])) == endaddr
;) {
399 dprintk(NDEBUG_MERGING
, "VTOP(%p) == %08lx -> merging\n",
400 page_address(sg_page(&cmd
->SCp
.buffer
[1])), endaddr
);
401 #if (NDEBUG & NDEBUG_MERGING)
405 --cmd
->SCp
.buffers_residual
;
406 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
407 endaddr
+= cmd
->SCp
.buffer
->length
;
409 #if (NDEBUG & NDEBUG_MERGING)
410 if (oldlen
!= cmd
->SCp
.this_residual
)
411 dprintk(NDEBUG_MERGING
, "merged %d buffers from %p, new length %08x\n",
412 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
414 #endif /* !defined(CONFIG_SUN3) */
418 * initialize_SCp - init the scsi pointer field
419 * @cmd: command block to set up
421 * Set up the internal fields in the SCSI command.
424 static inline void initialize_SCp(struct scsi_cmnd
*cmd
)
427 * Initialize the Scsi Pointer field so that all of the commands in the
428 * various queues are valid.
431 if (scsi_bufflen(cmd
)) {
432 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
433 cmd
->SCp
.buffers_residual
= scsi_sg_count(cmd
) - 1;
434 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
435 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
436 /* ++roman: Try to merge some scatter-buffers if they are at
437 * contiguous physical addresses.
439 merge_contiguous_buffers(cmd
);
441 cmd
->SCp
.buffer
= NULL
;
442 cmd
->SCp
.buffers_residual
= 0;
444 cmd
->SCp
.this_residual
= 0;
449 * NCR5380_poll_politely2 - wait for two chip register values
450 * @instance: controller to poll
451 * @reg1: 5380 register to poll
452 * @bit1: Bitmask to check
453 * @val1: Expected value
454 * @reg2: Second 5380 register to poll
455 * @bit2: Second bitmask to check
456 * @val2: Second expected value
457 * @wait: Time-out in jiffies
459 * Polls the chip in a reasonably efficient manner waiting for an
460 * event to occur. After a short quick poll we begin to yield the CPU
461 * (if possible). In irq contexts the time-out is arbitrarily limited.
462 * Callers may hold locks as long as they are held in irq mode.
464 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT.
467 static int NCR5380_poll_politely2(struct Scsi_Host
*instance
,
468 int reg1
, int bit1
, int val1
,
469 int reg2
, int bit2
, int val2
, int wait
)
471 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
472 unsigned long deadline
= jiffies
+ wait
;
475 /* Busy-wait for up to 10 ms */
476 n
= min(10000U, jiffies_to_usecs(wait
));
477 n
*= hostdata
->accesses_per_ms
;
480 if ((NCR5380_read(reg1
) & bit1
) == val1
)
482 if ((NCR5380_read(reg2
) & bit2
) == val2
)
487 if (irqs_disabled() || in_interrupt())
490 /* Repeatedly sleep for 1 ms until deadline */
491 while (time_is_after_jiffies(deadline
)) {
492 schedule_timeout_uninterruptible(1);
493 if ((NCR5380_read(reg1
) & bit1
) == val1
)
495 if ((NCR5380_read(reg2
) & bit2
) == val2
)
502 static inline int NCR5380_poll_politely(struct Scsi_Host
*instance
,
503 int reg
, int bit
, int val
, int wait
)
505 return NCR5380_poll_politely2(instance
, reg
, bit
, val
,
506 reg
, bit
, val
, wait
);
514 { SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
515 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
516 { SR_SEL
, "SEL" }, {0, NULL
}
518 {BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}
520 {ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
521 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
522 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
525 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"}, {MR_TARGET
, "MODE TARGET"},
526 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR
,
527 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR
,"MODE EOP INTR"},
528 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
529 {MR_DMA_MODE
, "MODE DMA"}, {MR_ARBITRATE
, "MODE ARBITRATION"},
534 * NCR5380_print - print scsi bus signals
535 * @instance: adapter state to dump
537 * Print the SCSI bus signals for debugging purposes
540 static void NCR5380_print(struct Scsi_Host
*instance
)
542 unsigned char status
, data
, basr
, mr
, icr
, i
;
544 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
545 status
= NCR5380_read(STATUS_REG
);
546 mr
= NCR5380_read(MODE_REG
);
547 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
548 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
550 printk("STATUS_REG: %02x ", status
);
551 for (i
= 0; signals
[i
].mask
; ++i
)
552 if (status
& signals
[i
].mask
)
553 printk(",%s", signals
[i
].name
);
554 printk("\nBASR: %02x ", basr
);
555 for (i
= 0; basrs
[i
].mask
; ++i
)
556 if (basr
& basrs
[i
].mask
)
557 printk(",%s", basrs
[i
].name
);
558 printk("\nICR: %02x ", icr
);
559 for (i
= 0; icrs
[i
].mask
; ++i
)
560 if (icr
& icrs
[i
].mask
)
561 printk(",%s", icrs
[i
].name
);
562 printk("\nMODE: %02x ", mr
);
563 for (i
= 0; mrs
[i
].mask
; ++i
)
564 if (mr
& mrs
[i
].mask
)
565 printk(",%s", mrs
[i
].name
);
573 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
574 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
575 {PHASE_UNKNOWN
, "UNKNOWN"}
579 * NCR5380_print_phase - show SCSI phase
580 * @instance: adapter to dump
582 * Print the current SCSI phase for debugging purposes
587 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
589 unsigned char status
;
592 status
= NCR5380_read(STATUS_REG
);
593 if (!(status
& SR_REQ
))
594 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
596 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
597 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
599 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
606 * NCR58380_info - report driver and host information
607 * @instance: relevant scsi host instance
609 * For use as the host template info() handler.
614 static const char *NCR5380_info(struct Scsi_Host
*instance
)
616 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
618 return hostdata
->info
;
621 static void prepare_info(struct Scsi_Host
*instance
)
623 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
625 snprintf(hostdata
->info
, sizeof(hostdata
->info
),
626 "%s, io_port 0x%lx, n_io_port %d, "
627 "base 0x%lx, irq %d, "
628 "can_queue %d, cmd_per_lun %d, "
629 "sg_tablesize %d, this_id %d, "
632 instance
->hostt
->name
, instance
->io_port
, instance
->n_io_port
,
633 instance
->base
, instance
->irq
,
634 instance
->can_queue
, instance
->cmd_per_lun
,
635 instance
->sg_tablesize
, instance
->this_id
,
636 hostdata
->flags
& FLAG_TAGGED_QUEUING
? "TAGGED_QUEUING " : "",
637 hostdata
->flags
& FLAG_TOSHIBA_DELAY
? "TOSHIBA_DELAY " : "",
654 * NCR5380_init - initialise an NCR5380
655 * @instance: adapter to configure
656 * @flags: control flags
658 * Initializes *instance and corresponding 5380 chip,
659 * with flags OR'd into the initial flags value.
661 * Notes : I assume that the host, hostno, and id bits have been
662 * set correctly. I don't care about the irq and other fields.
664 * Returns 0 for success
667 static int __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
669 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
671 unsigned long deadline
;
673 hostdata
->host
= instance
;
674 hostdata
->id_mask
= 1 << instance
->this_id
;
675 hostdata
->id_higher_mask
= 0;
676 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
677 if (i
> hostdata
->id_mask
)
678 hostdata
->id_higher_mask
|= i
;
679 for (i
= 0; i
< 8; ++i
)
680 hostdata
->busy
[i
] = 0;
684 #if defined (REAL_DMA)
685 hostdata
->dma_len
= 0;
687 spin_lock_init(&hostdata
->lock
);
688 hostdata
->connected
= NULL
;
689 hostdata
->issue_queue
= NULL
;
690 hostdata
->disconnected_queue
= NULL
;
691 hostdata
->flags
= flags
;
693 INIT_WORK(&hostdata
->main_task
, NCR5380_main
);
694 hostdata
->work_q
= alloc_workqueue("ncr5380_%d",
695 WQ_UNBOUND
| WQ_MEM_RECLAIM
,
696 1, instance
->host_no
);
697 if (!hostdata
->work_q
)
700 prepare_info(instance
);
702 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
703 NCR5380_write(MODE_REG
, MR_BASE
);
704 NCR5380_write(TARGET_COMMAND_REG
, 0);
705 NCR5380_write(SELECT_ENABLE_REG
, 0);
707 /* Calibrate register polling loop */
709 deadline
= jiffies
+ 1;
712 } while (time_is_after_jiffies(deadline
));
713 deadline
+= msecs_to_jiffies(256);
715 NCR5380_read(STATUS_REG
);
718 } while (time_is_after_jiffies(deadline
));
719 hostdata
->accesses_per_ms
= i
/ 256;
725 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
726 * @instance: adapter to check
728 * If the system crashed, it may have crashed with a connected target and
729 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
730 * currently established nexus, which we know nothing about. Failing that
733 * Note that a bus reset will cause the chip to assert IRQ.
735 * Returns 0 if successful, otherwise -ENXIO.
738 static int NCR5380_maybe_reset_bus(struct Scsi_Host
*instance
)
740 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
743 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) && pass
<= 6; ++pass
) {
748 shost_printk(KERN_ERR
, instance
, "SCSI bus busy, waiting up to five seconds\n");
749 NCR5380_poll_politely(instance
,
750 STATUS_REG
, SR_BSY
, 0, 5 * HZ
);
753 shost_printk(KERN_ERR
, instance
, "bus busy, attempting abort\n");
757 shost_printk(KERN_ERR
, instance
, "bus busy, attempting reset\n");
759 /* Wait after a reset; the SCSI standard calls for
760 * 250ms, we wait 500ms to be on the safe side.
761 * But some Toshiba CD-ROMs need ten times that.
763 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
769 shost_printk(KERN_ERR
, instance
, "bus locked solid\n");
777 * NCR5380_exit - remove an NCR5380
778 * @instance: adapter to remove
780 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
783 static void NCR5380_exit(struct Scsi_Host
*instance
)
785 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
787 cancel_work_sync(&hostdata
->main_task
);
788 destroy_workqueue(hostdata
->work_q
);
792 * NCR5380_queue_command - queue a command
793 * @instance: the relevant SCSI adapter
796 * cmd is added to the per-instance issue queue, with minor
797 * twiddling done to the host specific fields of cmd. If the
798 * main coroutine is not running, it is restarted.
801 static int NCR5380_queue_command(struct Scsi_Host
*instance
,
802 struct scsi_cmnd
*cmd
)
804 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
805 struct scsi_cmnd
*tmp
;
808 #if (NDEBUG & NDEBUG_NO_WRITE)
809 switch (cmd
->cmnd
[0]) {
812 shost_printk(KERN_DEBUG
, instance
, "WRITE attempted with NDEBUG_NO_WRITE set\n");
813 cmd
->result
= (DID_ERROR
<< 16);
817 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
820 * We use the host_scribble field as a pointer to the next command
828 * Insert the cmd into the issue queue. Note that REQUEST SENSE
829 * commands are added to the head of the queue since any command will
830 * clear the contingent allegiance condition that exists and the
831 * sense data is only guaranteed to be valid while the condition exists.
834 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
835 * Otherwise a running NCR5380_main may steal the lock.
836 * Lock before actually inserting due to fairness reasons explained in
837 * atari_scsi.c. If we insert first, then it's impossible for this driver
838 * to release the lock.
839 * Stop timer for this command while waiting for the lock, or timeouts
840 * may happen (and they really do), and it's no good if the command doesn't
841 * appear in any of the queues.
842 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
843 * because also a timer int can trigger an abort or reset, which would
844 * alter queues and touch the lock.
846 if (!NCR5380_acquire_dma_irq(instance
))
847 return SCSI_MLQUEUE_HOST_BUSY
;
849 spin_lock_irqsave(&hostdata
->lock
, flags
);
852 * Insert the cmd into the issue queue. Note that REQUEST SENSE
853 * commands are added to the head of the queue since any command will
854 * clear the contingent allegiance condition that exists and the
855 * sense data is only guaranteed to be valid while the condition exists.
858 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
859 LIST(cmd
, hostdata
->issue_queue
);
860 SET_NEXT(cmd
, hostdata
->issue_queue
);
861 hostdata
->issue_queue
= cmd
;
863 for (tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
864 NEXT(tmp
); tmp
= NEXT(tmp
))
869 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
871 dsprintk(NDEBUG_QUEUES
, instance
, "command %p added to %s of queue\n",
872 cmd
, (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
874 /* Kick off command processing */
875 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
879 static inline void maybe_release_dma_irq(struct Scsi_Host
*instance
)
881 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
883 /* Caller does the locking needed to set & test these data atomically */
884 if (!hostdata
->disconnected_queue
&&
885 !hostdata
->issue_queue
&&
886 !hostdata
->connected
&&
887 !hostdata
->retain_dma_intr
)
888 NCR5380_release_dma_irq(instance
);
892 * NCR5380_main - NCR state machines
894 * NCR5380_main is a coroutine that runs as long as more work can
895 * be done on the NCR5380 host adapters in a system. Both
896 * NCR5380_queue_command() and NCR5380_intr() will try to start it
897 * in case it is not running.
899 * Locks: called as its own thread with no locks held.
902 static void NCR5380_main(struct work_struct
*work
)
904 struct NCR5380_hostdata
*hostdata
=
905 container_of(work
, struct NCR5380_hostdata
, main_task
);
906 struct Scsi_Host
*instance
= hostdata
->host
;
907 struct scsi_cmnd
*tmp
, *prev
;
911 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
912 * because also a timer int can trigger an abort or reset, which can
913 * alter queues and touch the Falcon lock.
916 spin_lock_irq(&hostdata
->lock
);
920 if (!hostdata
->connected
) {
921 dprintk(NDEBUG_MAIN
, "scsi%d: not connected\n", HOSTNO
);
923 * Search through the issue_queue for a command destined
924 * for a target that's not busy.
926 #if (NDEBUG & NDEBUG_LISTS)
927 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
928 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
930 /*printk("%p ", tmp);*/
931 if ((tmp
== prev
) && tmp
)
933 /* else printk("\n"); */
935 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
,
936 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
937 u8 lun
= tmp
->device
->lun
;
939 dsprintk(NDEBUG_QUEUES
, instance
, "main: tmp=%p target=%d busy=%d lun=%d\n",
940 tmp
, scmd_id(tmp
), hostdata
->busy
[scmd_id(tmp
)], lun
);
941 /* When we find one, remove it from the issue queue. */
944 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
946 !(hostdata
->busy
[tmp
->device
->id
] & (1 << lun
))
950 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
951 SET_NEXT(prev
, NEXT(tmp
));
953 REMOVE(-1, hostdata
->issue_queue
, tmp
, NEXT(tmp
));
954 hostdata
->issue_queue
= NEXT(tmp
);
957 dsprintk(NDEBUG_MAIN
| NDEBUG_QUEUES
,
958 instance
, "main: removed %p from issue queue %p\n",
961 hostdata
->retain_dma_intr
++;
964 * Attempt to establish an I_T_L nexus here.
965 * On success, instance->hostdata->connected is set.
966 * On failure, we must add the command back to the
967 * issue queue so we can keep trying.
970 * REQUEST SENSE commands are issued without tagged
971 * queueing, even on SCSI-II devices because the
972 * contingent allegiance condition exists for the
975 /* ++roman: ...and the standard also requires that
976 * REQUEST SENSE command are untagged.
980 cmd_get_tag(tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
982 if (!NCR5380_select(instance
, tmp
)) {
983 /* OK or bad target */
984 hostdata
->retain_dma_intr
--;
985 maybe_release_dma_irq(instance
);
988 LIST(tmp
, hostdata
->issue_queue
);
989 SET_NEXT(tmp
, hostdata
->issue_queue
);
990 hostdata
->issue_queue
= tmp
;
991 dsprintk(NDEBUG_MAIN
| NDEBUG_QUEUES
,
992 instance
, "main: select() failed, %p returned to issue queue\n",
997 hostdata
->retain_dma_intr
--;
1000 if (hostdata
->connected
)
1002 } /* if target/lun/target queue is not busy */
1003 } /* for issue_queue */
1004 } /* if (!hostdata->connected) */
1006 if (hostdata
->connected
1008 && !hostdata
->dma_len
1011 dprintk(NDEBUG_MAIN
, "scsi%d: main: performing information transfer\n",
1013 NCR5380_information_transfer(instance
);
1014 dprintk(NDEBUG_MAIN
, "scsi%d: main: done set false\n", HOSTNO
);
1018 spin_unlock_irq(&hostdata
->lock
);
1024 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1026 * Purpose : Called by interrupt handler when DMA finishes or a phase
1027 * mismatch occurs (which would finish the DMA transfer).
1029 * Inputs : instance - this instance of the NCR5380.
1033 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
1035 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1037 unsigned char **data
;
1038 volatile int *count
;
1039 int saved_data
= 0, overrun
= 0;
1042 if (hostdata
->read_overruns
) {
1043 p
= hostdata
->connected
->SCp
.phase
;
1046 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
1047 (BASR_PHASE_MATCH
|BASR_ACK
)) ==
1048 (BASR_PHASE_MATCH
|BASR_ACK
)) {
1049 saved_data
= NCR5380_read(INPUT_DATA_REG
);
1051 dprintk(NDEBUG_DMA
, "scsi%d: read overrun handled\n", HOSTNO
);
1056 #if defined(CONFIG_SUN3)
1057 if ((sun3scsi_dma_finish(rq_data_dir(hostdata
->connected
->request
)))) {
1058 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
1063 /* make sure we're not stuck in a data phase */
1064 if ((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
1065 (BASR_PHASE_MATCH
| BASR_ACK
)) {
1066 pr_err("scsi%d: BASR %02x\n", instance
->host_no
,
1067 NCR5380_read(BUS_AND_STATUS_REG
));
1068 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
1074 NCR5380_write(MODE_REG
, MR_BASE
);
1075 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1076 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1078 transferred
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1079 hostdata
->dma_len
= 0;
1081 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
1082 count
= &hostdata
->connected
->SCp
.this_residual
;
1083 *data
+= transferred
;
1084 *count
-= transferred
;
1086 if (hostdata
->read_overruns
) {
1089 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
1090 cnt
= toPIO
= hostdata
->read_overruns
;
1092 dprintk(NDEBUG_DMA
, "Got an input overrun, using saved byte\n");
1093 *(*data
)++ = saved_data
;
1098 dprintk(NDEBUG_DMA
, "Doing %d-byte PIO to 0x%08lx\n", cnt
, (long)*data
);
1099 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
);
1100 *count
-= toPIO
- cnt
;
1104 #endif /* REAL_DMA */
1108 * NCR5380_intr - generic NCR5380 irq handler
1109 * @irq: interrupt number
1110 * @dev_id: device info
1112 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1113 * from the disconnected queue, and restarting NCR5380_main()
1116 * The chip can assert IRQ in any of six different conditions. The IRQ flag
1117 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR).
1118 * Three of these six conditions are latched in the Bus and Status Register:
1119 * - End of DMA (cleared by ending DMA Mode)
1120 * - Parity error (cleared by reading RPIR)
1121 * - Loss of BSY (cleared by reading RPIR)
1122 * Two conditions have flag bits that are not latched:
1123 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode)
1124 * - Bus reset (non-maskable)
1125 * The remaining condition has no flag bit at all:
1126 * - Selection/reselection
1128 * Hence, establishing the cause(s) of any interrupt is partly guesswork.
1129 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor
1130 * claimed that "the design of the [DP8490] interrupt logic ensures
1131 * interrupts will not be lost (they can be on the DP5380)."
1132 * The L5380/53C80 datasheet from LOGIC Devices has more details.
1134 * Checking for bus reset by reading RST is futile because of interrupt
1135 * latency, but a bus reset will reset chip logic. Checking for parity error
1136 * is unnecessary because that interrupt is never enabled. A Loss of BSY
1137 * condition will clear DMA Mode. We can tell when this occurs because the
1138 * the Busy Monitor interrupt is enabled together with DMA Mode.
1141 static irqreturn_t
NCR5380_intr(int irq
, void *dev_id
)
1143 struct Scsi_Host
*instance
= dev_id
;
1144 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1147 unsigned long flags
;
1149 spin_lock_irqsave(&hostdata
->lock
, flags
);
1151 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1152 if (basr
& BASR_IRQ
) {
1153 unsigned char mr
= NCR5380_read(MODE_REG
);
1154 unsigned char sr
= NCR5380_read(STATUS_REG
);
1156 dprintk(NDEBUG_INTR
, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n",
1157 HOSTNO
, irq
, basr
, sr
, mr
);
1159 #if defined(REAL_DMA)
1160 if ((mr
& MR_DMA_MODE
) || (mr
& MR_MONITOR_BSY
)) {
1161 /* Probably End of DMA, Phase Mismatch or Loss of BSY.
1162 * We ack IRQ after clearing Mode Register. Workarounds
1163 * for End of DMA errata need to happen in DMA Mode.
1166 dprintk(NDEBUG_INTR
, "scsi%d: interrupt in DMA mode\n", HOSTNO
);
1168 if (hostdata
->connected
) {
1169 NCR5380_dma_complete(instance
);
1170 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
1172 NCR5380_write(MODE_REG
, MR_BASE
);
1173 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1176 #endif /* REAL_DMA */
1177 if ((NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_mask
) &&
1178 (sr
& (SR_SEL
| SR_IO
| SR_BSY
| SR_RST
)) == (SR_SEL
| SR_IO
)) {
1179 /* Probably reselected */
1180 NCR5380_write(SELECT_ENABLE_REG
, 0);
1181 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1183 dprintk(NDEBUG_INTR
, "scsi%d: interrupt with SEL and IO\n",
1186 if (!hostdata
->connected
) {
1187 NCR5380_reselect(instance
);
1188 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
1190 if (!hostdata
->connected
)
1191 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1193 /* Probably Bus Reset */
1194 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1196 dprintk(NDEBUG_INTR
, "scsi%d: unknown interrupt\n", HOSTNO
);
1197 #ifdef SUN3_SCSI_VME
1198 dregs
->csr
|= CSR_DMA_ENABLE
;
1203 shost_printk(KERN_NOTICE
, instance
, "interrupt without IRQ bit\n");
1204 #ifdef SUN3_SCSI_VME
1205 dregs
->csr
|= CSR_DMA_ENABLE
;
1209 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
1211 return IRQ_RETVAL(handled
);
1215 * Function : int NCR5380_select(struct Scsi_Host *instance,
1216 * struct scsi_cmnd *cmd)
1218 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1219 * including ARBITRATION, SELECTION, and initial message out for
1220 * IDENTIFY and queue messages.
1222 * Inputs : instance - instantiation of the 5380 driver on which this
1223 * target lives, cmd - SCSI command to execute.
1225 * Returns : -1 if selection failed but should be retried.
1226 * 0 if selection failed and should not be retried.
1227 * 0 if selection succeeded completely (hostdata->connected == cmd).
1230 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1231 * with registers as they should have been on entry - ie
1232 * SELECT_ENABLE will be set appropriately, the NCR5380
1233 * will cease to drive any SCSI bus signals.
1235 * If successful : I_T_L or I_T_L_Q nexus will be established,
1236 * instance->connected will be set to cmd.
1237 * SELECT interrupt will be disabled.
1239 * If failed (no target) : cmd->scsi_done() will be called, and the
1240 * cmd->result host byte set to DID_BAD_TARGET.
1243 static int NCR5380_select(struct Scsi_Host
*instance
, struct scsi_cmnd
*cmd
)
1245 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1246 unsigned char tmp
[3], phase
;
1247 unsigned char *data
;
1251 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
1252 dprintk(NDEBUG_ARBITRATION
, "scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1256 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1257 * data bus during SELECTION.
1260 NCR5380_write(TARGET_COMMAND_REG
, 0);
1263 * Start arbitration.
1266 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1267 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1269 /* The chip now waits for BUS FREE phase. Then after the 800 ns
1270 * Bus Free Delay, arbitration will begin.
1273 spin_unlock_irq(&hostdata
->lock
);
1274 err
= NCR5380_poll_politely2(instance
, MODE_REG
, MR_ARBITRATE
, 0,
1275 INITIATOR_COMMAND_REG
, ICR_ARBITRATION_PROGRESS
,
1276 ICR_ARBITRATION_PROGRESS
, HZ
);
1277 spin_lock_irq(&hostdata
->lock
);
1278 if (!(NCR5380_read(MODE_REG
) & MR_ARBITRATE
)) {
1279 /* Reselection interrupt */
1283 NCR5380_write(MODE_REG
, MR_BASE
);
1284 shost_printk(KERN_ERR
, instance
,
1285 "select: arbitration timeout\n");
1288 spin_unlock_irq(&hostdata
->lock
);
1290 /* The SCSI-2 arbitration delay is 2.4 us */
1293 /* Check for lost arbitration */
1294 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1295 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1296 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1297 NCR5380_write(MODE_REG
, MR_BASE
);
1298 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1300 spin_lock_irq(&hostdata
->lock
);
1304 /* After/during arbitration, BSY should be asserted.
1305 * IBM DPES-31080 Version S31Q works now
1306 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1308 NCR5380_write(INITIATOR_COMMAND_REG
,
1309 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1312 * Again, bus clear + bus settle time is 1.2us, however, this is
1313 * a minimum so we'll udelay ceil(1.2)
1316 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
1321 spin_lock_irq(&hostdata
->lock
);
1323 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */
1324 if (!(NCR5380_read(MODE_REG
) & MR_ARBITRATE
))
1327 dprintk(NDEBUG_ARBITRATION
, "scsi%d: won arbitration\n", HOSTNO
);
1330 * Now that we have won arbitration, start Selection process, asserting
1331 * the host and target ID's on the SCSI bus.
1334 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1337 * Raise ATN while SEL is true before BSY goes false from arbitration,
1338 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1339 * phase immediately after selection.
1342 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1343 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1344 NCR5380_write(MODE_REG
, MR_BASE
);
1347 * Reselect interrupts must be turned off prior to the dropping of BSY,
1348 * otherwise we will trigger an interrupt.
1350 NCR5380_write(SELECT_ENABLE_REG
, 0);
1352 spin_unlock_irq(&hostdata
->lock
);
1355 * The initiator shall then wait at least two deskew delays and release
1358 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1361 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1362 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1365 * Something weird happens when we cease to drive BSY - looks
1366 * like the board/chip is letting us do another read before the
1367 * appropriate propagation delay has expired, and we're confusing
1368 * a BSY signal from ourselves as the target's response to SELECTION.
1370 * A small delay (the 'C++' frontend breaks the pipeline with an
1371 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1372 * tighter 'C' code breaks and requires this) solves the problem -
1373 * the 1 us delay is arbitrary, and only used because this delay will
1374 * be the same on other platforms and since it works here, it should
1377 * wingel suggests that this could be due to failing to wait
1383 dprintk(NDEBUG_SELECTION
, "scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1386 * The SCSI specification calls for a 250 ms timeout for the actual
1390 err
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_BSY
, SR_BSY
,
1391 msecs_to_jiffies(250));
1393 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1394 spin_lock_irq(&hostdata
->lock
);
1395 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1396 NCR5380_reselect(instance
);
1397 if (!hostdata
->connected
)
1398 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1399 printk(KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1405 spin_lock_irq(&hostdata
->lock
);
1406 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1407 cmd
->result
= DID_BAD_TARGET
<< 16;
1411 cmd
->scsi_done(cmd
);
1412 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1413 dprintk(NDEBUG_SELECTION
, "scsi%d: target did not respond within 250ms\n", HOSTNO
);
1418 * No less than two deskew delays after the initiator detects the
1419 * BSY signal is true, it shall release the SEL signal and may
1420 * change the DATA BUS. -wingel
1425 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1428 * Since we followed the SCSI spec, and raised ATN while SEL
1429 * was true but before BSY was false during selection, the information
1430 * transfer phase should be a MESSAGE OUT phase so that we can send the
1433 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1434 * message (2 bytes) with a tag ID that we increment with every command
1435 * until it wraps back to 0.
1437 * XXX - it turns out that there are some broken SCSI-II devices,
1438 * which claim to support tagged queuing but fail when more than
1439 * some number of commands are issued at once.
1442 /* Wait for start of REQ/ACK handshake */
1444 err
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
1445 spin_lock_irq(&hostdata
->lock
);
1447 shost_printk(KERN_ERR
, instance
, "select: REQ timeout\n");
1448 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1449 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1453 dprintk(NDEBUG_SELECTION
, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1454 HOSTNO
, cmd
->device
->id
);
1455 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1458 if (cmd
->tag
!= TAG_NONE
) {
1459 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1467 #endif /* SUPPORT_TAGS */
1469 /* Send message(s) */
1471 phase
= PHASE_MSGOUT
;
1472 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1473 dprintk(NDEBUG_SELECTION
, "scsi%d: nexus established.\n", HOSTNO
);
1474 /* XXX need to handle errors here */
1476 hostdata
->connected
= cmd
;
1477 #ifndef SUPPORT_TAGS
1478 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1480 #ifdef SUN3_SCSI_VME
1481 dregs
->csr
|= CSR_INTR
;
1484 initialize_SCp(cmd
);
1490 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1491 * unsigned char *phase, int *count, unsigned char **data)
1493 * Purpose : transfers data in given phase using polled I/O
1495 * Inputs : instance - instance of driver, *phase - pointer to
1496 * what phase is expected, *count - pointer to number of
1497 * bytes to transfer, **data - pointer to data pointer.
1499 * Returns : -1 when different phase is entered without transferring
1500 * maximum number of bytes, 0 if all bytes are transferred or exit
1503 * Also, *phase, *count, *data are modified in place.
1505 * XXX Note : handling for bus free may be useful.
1509 * Note : this code is not as quick as it could be, however it
1510 * IS 100% reliable, and for the actual data transfer where speed
1511 * counts, we will always do a pseudo DMA or DMA transfer.
1514 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1515 unsigned char *phase
, int *count
,
1516 unsigned char **data
)
1518 register unsigned char p
= *phase
, tmp
;
1519 register int c
= *count
;
1520 register unsigned char *d
= *data
;
1523 * The NCR5380 chip will only drive the SCSI bus when the
1524 * phase specified in the appropriate bits of the TARGET COMMAND
1525 * REGISTER match the STATUS REGISTER
1528 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1532 * Wait for assertion of REQ, after which the phase bits will be
1536 if (NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
) < 0)
1539 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: REQ detected\n", HOSTNO
);
1541 /* Check for phase mismatch */
1542 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) != p
) {
1543 dprintk(NDEBUG_PIO
, "scsi%d: phase mismatch\n", HOSTNO
);
1544 NCR5380_dprint_phase(NDEBUG_PIO
, instance
);
1548 /* Do actual transfer from SCSI bus to / from memory */
1550 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1552 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1557 * The SCSI standard suggests that in MSGOUT phase, the initiator
1558 * should drop ATN on the last byte of the message phase
1559 * after REQ has been asserted for the handshake but before
1560 * the initiator raises ACK.
1564 if (!((p
& SR_MSG
) && c
> 1)) {
1565 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1566 NCR5380_dprint(NDEBUG_PIO
, instance
);
1567 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1568 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1570 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1571 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1572 NCR5380_dprint(NDEBUG_PIO
, instance
);
1573 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1574 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1577 NCR5380_dprint(NDEBUG_PIO
, instance
);
1578 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1581 if (NCR5380_poll_politely(instance
,
1582 STATUS_REG
, SR_REQ
, 0, 5 * HZ
) < 0)
1585 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: req false, handshake complete\n", HOSTNO
);
1588 * We have several special cases to consider during REQ/ACK handshaking :
1589 * 1. We were in MSGOUT phase, and we are on the last byte of the
1590 * message. ATN must be dropped as ACK is dropped.
1592 * 2. We are in a MSGIN phase, and we are on the last byte of the
1593 * message. We must exit with ACK asserted, so that the calling
1594 * code may raise ATN before dropping ACK to reject the message.
1596 * 3. ACK and ATN are clear and the target may proceed as normal.
1598 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1599 if (p
== PHASE_MSGOUT
&& c
> 1)
1600 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1602 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1606 dprintk(NDEBUG_PIO
, "scsi%d: residual %d\n", HOSTNO
, c
);
1610 tmp
= NCR5380_read(STATUS_REG
);
1611 /* The phase read from the bus is valid if either REQ is (already)
1612 * asserted or if ACK hasn't been released yet. The latter applies if
1613 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1615 if ((tmp
& SR_REQ
) || ((tmp
& SR_IO
) && c
== 0))
1616 *phase
= tmp
& PHASE_MASK
;
1618 *phase
= PHASE_UNKNOWN
;
1620 if (!c
|| (*phase
== p
))
1627 * do_reset - issue a reset command
1628 * @instance: adapter to reset
1630 * Issue a reset sequence to the NCR5380 and try and get the bus
1631 * back into sane shape.
1633 * This clears the reset interrupt flag because there may be no handler for
1634 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1635 * been installed. And when in EH we may have released the ST DMA interrupt.
1638 static void do_reset(struct Scsi_Host
*instance
)
1640 unsigned long flags
;
1642 local_irq_save(flags
);
1643 NCR5380_write(TARGET_COMMAND_REG
,
1644 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
1645 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
1647 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1648 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1649 local_irq_restore(flags
);
1653 * do_abort - abort the currently established nexus by going to
1654 * MESSAGE OUT phase and sending an ABORT message.
1655 * @instance: relevant scsi host instance
1657 * Returns 0 on success, -1 on failure.
1660 static int do_abort(struct Scsi_Host
*instance
)
1662 unsigned char tmp
, *msgptr
, phase
;
1666 /* Request message out phase */
1667 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1670 * Wait for the target to indicate a valid phase by asserting
1671 * REQ. Once this happens, we'll have either a MSGOUT phase
1672 * and can immediately send the ABORT message, or we'll have some
1673 * other phase and will have to source/sink data.
1675 * We really don't care what value was on the bus or what value
1676 * the target sees, so we just handshake.
1679 rc
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, 10 * HZ
);
1683 tmp
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
1685 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1687 if (tmp
!= PHASE_MSGOUT
) {
1688 NCR5380_write(INITIATOR_COMMAND_REG
,
1689 ICR_BASE
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1690 rc
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, 0, 3 * HZ
);
1693 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1699 phase
= PHASE_MSGOUT
;
1700 NCR5380_transfer_pio(instance
, &phase
, &len
, &msgptr
);
1703 * If we got here, and the command completed successfully,
1704 * we're about to go into bus free state.
1707 return len
? -1 : 0;
1710 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1714 #if defined(REAL_DMA)
1716 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1717 * unsigned char *phase, int *count, unsigned char **data)
1719 * Purpose : transfers data in given phase using either real
1722 * Inputs : instance - instance of driver, *phase - pointer to
1723 * what phase is expected, *count - pointer to number of
1724 * bytes to transfer, **data - pointer to data pointer.
1726 * Returns : -1 when different phase is entered without transferring
1727 * maximum number of bytes, 0 if all bytes or transferred or exit
1730 * Also, *phase, *count, *data are modified in place.
1735 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1736 unsigned char *phase
, int *count
,
1737 unsigned char **data
)
1739 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1740 register int c
= *count
;
1741 register unsigned char p
= *phase
;
1743 #if defined(CONFIG_SUN3)
1745 if (!sun3_dma_setup_done
) {
1746 pr_err("scsi%d: transfer_dma without setup!\n",
1750 hostdata
->dma_len
= c
;
1752 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1753 instance
->host_no
, (p
& SR_IO
) ? "reading" : "writing",
1754 c
, (p
& SR_IO
) ? "to" : "from", *data
);
1756 /* netbsd turns off ints here, why not be safe and do it too */
1758 /* send start chain */
1759 sun3scsi_dma_start(c
, *data
);
1761 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1762 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_MONITOR_BSY
|
1763 MR_ENABLE_EOP_INTR
);
1765 NCR5380_write(INITIATOR_COMMAND_REG
, 0);
1766 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1768 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_DATA
);
1769 NCR5380_write(START_DMA_SEND_REG
, 0);
1772 #ifdef SUN3_SCSI_VME
1773 dregs
->csr
|= CSR_DMA_ENABLE
;
1776 sun3_dma_active
= 1;
1778 #else /* !defined(CONFIG_SUN3) */
1779 register unsigned char *d
= *data
;
1782 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1787 if (hostdata
->read_overruns
&& (p
& SR_IO
))
1788 c
-= hostdata
->read_overruns
;
1790 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1791 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1792 c
, (p
& SR_IO
) ? "to" : "from", d
);
1794 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1795 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_MONITOR_BSY
|
1796 MR_ENABLE_EOP_INTR
);
1798 if (!(hostdata
->flags
& FLAG_LATE_DMA_SETUP
)) {
1799 /* On the Medusa, it is a must to initialize the DMA before
1800 * starting the NCR. This is also the cleaner way for the TT.
1802 hostdata
->dma_len
= (p
& SR_IO
) ?
1803 NCR5380_dma_read_setup(instance
, d
, c
) :
1804 NCR5380_dma_write_setup(instance
, d
, c
);
1808 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1810 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1811 NCR5380_write(START_DMA_SEND_REG
, 0);
1814 if (hostdata
->flags
& FLAG_LATE_DMA_SETUP
) {
1815 /* On the Falcon, the DMA setup must be done after the last */
1816 /* NCR access, else the DMA setup gets trashed!
1818 hostdata
->dma_len
= (p
& SR_IO
) ?
1819 NCR5380_dma_read_setup(instance
, d
, c
) :
1820 NCR5380_dma_write_setup(instance
, d
, c
);
1822 #endif /* !defined(CONFIG_SUN3) */
1826 #endif /* defined(REAL_DMA) */
1829 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1831 * Purpose : run through the various SCSI phases and do as the target
1832 * directs us to. Operates on the currently connected command,
1833 * instance->connected.
1835 * Inputs : instance, instance for which we are doing commands
1837 * Side effects : SCSI things happen, the disconnected queue will be
1838 * modified if a command disconnects, *instance->connected will
1841 * XXX Note : we need to watch for bus free or a reset condition here
1842 * to recover from an unexpected bus free condition.
1845 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
1847 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1848 unsigned char msgout
= NOP
;
1851 #if defined(REAL_DMA)
1854 unsigned char *data
;
1855 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
1856 struct scsi_cmnd
*cmd
;
1858 #ifdef SUN3_SCSI_VME
1859 dregs
->csr
|= CSR_INTR
;
1862 while ((cmd
= hostdata
->connected
)) {
1863 tmp
= NCR5380_read(STATUS_REG
);
1864 /* We only have a valid SCSI phase when REQ is asserted */
1866 phase
= (tmp
& PHASE_MASK
);
1867 if (phase
!= old_phase
) {
1869 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
1871 #if defined(CONFIG_SUN3)
1872 if (phase
== PHASE_CMDOUT
) {
1873 #if defined(REAL_DMA)
1875 unsigned long count
;
1877 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
1878 count
= cmd
->SCp
.buffer
->length
;
1879 d
= sg_virt(cmd
->SCp
.buffer
);
1881 count
= cmd
->SCp
.this_residual
;
1884 /* this command setup for dma yet? */
1885 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= cmd
)) {
1886 if (cmd
->request
->cmd_type
== REQ_TYPE_FS
) {
1887 sun3scsi_dma_setup(d
, count
,
1888 rq_data_dir(cmd
->request
));
1889 sun3_dma_setup_done
= cmd
;
1893 #ifdef SUN3_SCSI_VME
1894 dregs
->csr
|= CSR_INTR
;
1897 #endif /* CONFIG_SUN3 */
1899 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
1900 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1902 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1904 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1906 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1914 #if (NDEBUG & NDEBUG_NO_DATAOUT)
1915 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
1916 "aborted\n", HOSTNO
);
1919 cmd
->result
= DID_ERROR
<< 16;
1920 cmd
->scsi_done(cmd
);
1925 * If there is no room left in the current buffer in the
1926 * scatter-gather list, move onto the next one.
1929 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
1931 --cmd
->SCp
.buffers_residual
;
1932 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
1933 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
1934 /* ++roman: Try to merge some scatter-buffers if
1935 * they are at contiguous physical addresses.
1937 merge_contiguous_buffers(cmd
);
1938 dprintk(NDEBUG_INFORMATION
, "scsi%d: %d bytes and %d buffers left\n",
1939 HOSTNO
, cmd
->SCp
.this_residual
,
1940 cmd
->SCp
.buffers_residual
);
1944 * The preferred transfer method is going to be
1945 * PSEUDO-DMA for systems that are strictly PIO,
1946 * since we can let the hardware do the handshaking.
1948 * For this to work, we need to know the transfersize
1949 * ahead of time, since the pseudo-DMA code will sit
1950 * in an unconditional loop.
1953 /* ++roman: I suggest, this should be
1955 * instead of leaving REAL_DMA out.
1958 #if defined(REAL_DMA)
1959 #if !defined(CONFIG_SUN3)
1961 if (!cmd
->device
->borken
)
1963 transfersize
= NCR5380_dma_xfer_len(instance
, cmd
, phase
);
1965 if (transfersize
>= DMA_MIN_SIZE
) {
1967 cmd
->SCp
.phase
= phase
;
1968 if (NCR5380_transfer_dma(instance
, &phase
,
1969 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
1971 * If the watchdog timer fires, all future
1972 * accesses to this device will use the
1974 scmd_printk(KERN_INFO
, cmd
,
1975 "switching to slow handshake\n");
1976 cmd
->device
->borken
= 1;
1979 cmd
->result
= DID_ERROR
<< 16;
1980 cmd
->scsi_done(cmd
);
1981 /* XXX - need to source or sink data here, as appropriate */
1984 /* ++roman: When using real DMA,
1985 * information_transfer() should return after
1986 * starting DMA since it has nothing more to
1991 cmd
->SCp
.this_residual
-= transfersize
- len
;
1995 #endif /* defined(REAL_DMA) */
1997 spin_unlock_irq(&hostdata
->lock
);
1998 NCR5380_transfer_pio(instance
, &phase
,
1999 (int *)&cmd
->SCp
.this_residual
,
2000 (unsigned char **)&cmd
->SCp
.ptr
);
2001 spin_lock_irq(&hostdata
->lock
);
2003 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2004 /* if we had intended to dma that command clear it */
2005 if (sun3_dma_setup_done
== cmd
)
2006 sun3_dma_setup_done
= NULL
;
2012 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2013 cmd
->SCp
.Message
= tmp
;
2017 case COMMAND_COMPLETE
:
2018 /* Accept message by clearing ACK */
2019 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2020 dsprintk(NDEBUG_QUEUES
, instance
,
2021 "COMMAND COMPLETE %p target %d lun %llu\n",
2022 cmd
, scmd_id(cmd
), cmd
->device
->lun
);
2024 hostdata
->connected
= NULL
;
2027 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2028 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][cmd
->device
->lun
];
2029 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu returned "
2030 "QUEUE_FULL after %d commands\n",
2031 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2033 if (ta
->queue_size
> ta
->nr_allocated
)
2034 ta
->queue_size
= ta
->nr_allocated
;
2037 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2041 * I'm not sure what the correct thing to do here is :
2043 * If the command that just executed is NOT a request
2044 * sense, the obvious thing to do is to set the result
2045 * code to the values of the stored parameters.
2047 * If it was a REQUEST SENSE command, we need some way to
2048 * differentiate between the failure code of the original
2049 * and the failure code of the REQUEST sense - the obvious
2050 * case is success, where we fall through and leave the
2051 * result code unchanged.
2053 * The non-obvious place is where the REQUEST SENSE failed
2056 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2057 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2058 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2059 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2061 if ((cmd
->cmnd
[0] == REQUEST_SENSE
) &&
2062 hostdata
->ses
.cmd_len
) {
2063 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
2064 hostdata
->ses
.cmd_len
= 0 ;
2067 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2068 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2069 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
2071 LIST(cmd
,hostdata
->issue_queue
);
2072 SET_NEXT(cmd
, hostdata
->issue_queue
);
2073 hostdata
->issue_queue
= (struct scsi_cmnd
*) cmd
;
2074 dsprintk(NDEBUG_AUTOSENSE
| NDEBUG_QUEUES
,
2075 instance
, "REQUEST SENSE cmd %p added to head of issue queue\n",
2078 cmd
->scsi_done(cmd
);
2082 * Restore phase bits to 0 so an interrupted selection,
2083 * arbitration can resume.
2085 NCR5380_write(TARGET_COMMAND_REG
, 0);
2087 /* Enable reselect interrupts */
2088 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2090 /* ++roman: For Falcon SCSI, release the lock on the
2091 * ST-DMA here if no other commands are waiting on the
2092 * disconnected queue.
2094 maybe_release_dma_irq(instance
);
2096 case MESSAGE_REJECT
:
2097 /* Accept message by clearing ACK */
2098 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2099 switch (hostdata
->last_message
) {
2100 case HEAD_OF_QUEUE_TAG
:
2101 case ORDERED_QUEUE_TAG
:
2102 case SIMPLE_QUEUE_TAG
:
2103 /* The target obviously doesn't support tagged
2104 * queuing, even though it announced this ability in
2105 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2106 * clear 'tagged_supported' and lock the LUN, since
2107 * the command is treated as untagged further on.
2109 cmd
->device
->tagged_supported
= 0;
2110 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2111 cmd
->tag
= TAG_NONE
;
2112 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu rejected "
2113 "QUEUE_TAG message; tagged queuing "
2115 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2120 /* Accept message by clearing ACK */
2121 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2122 LIST(cmd
,hostdata
->disconnected_queue
);
2123 SET_NEXT(cmd
, hostdata
->disconnected_queue
);
2124 hostdata
->connected
= NULL
;
2125 hostdata
->disconnected_queue
= cmd
;
2126 dsprintk(NDEBUG_INFORMATION
| NDEBUG_QUEUES
,
2127 instance
, "connected command %p for target %d lun %llu moved to disconnected queue\n",
2128 cmd
, scmd_id(cmd
), cmd
->device
->lun
);
2131 * Restore phase bits to 0 so an interrupted selection,
2132 * arbitration can resume.
2134 NCR5380_write(TARGET_COMMAND_REG
, 0);
2136 /* Enable reselect interrupts */
2137 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2138 #ifdef SUN3_SCSI_VME
2139 dregs
->csr
|= CSR_DMA_ENABLE
;
2143 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2144 * operation, in violation of the SCSI spec so we can safely
2145 * ignore SAVE/RESTORE pointers calls.
2147 * Unfortunately, some disks violate the SCSI spec and
2148 * don't issue the required SAVE_POINTERS message before
2149 * disconnecting, and we have to break spec to remain
2153 case RESTORE_POINTERS
:
2154 /* Accept message by clearing ACK */
2155 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2157 case EXTENDED_MESSAGE
:
2159 * Extended messages are sent in the following format :
2161 * 0 EXTENDED_MESSAGE == 1
2162 * 1 length (includes one byte for code, doesn't
2163 * include first two bytes)
2165 * 3..length+1 arguments
2167 * Start the extended message buffer with the EXTENDED_MESSAGE
2168 * byte, since spi_print_msg() wants the whole thing.
2170 extended_msg
[0] = EXTENDED_MESSAGE
;
2171 /* Accept first byte by clearing ACK */
2172 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2174 spin_unlock_irq(&hostdata
->lock
);
2176 dprintk(NDEBUG_EXTENDED
, "scsi%d: receiving extended message\n", HOSTNO
);
2179 data
= extended_msg
+ 1;
2180 phase
= PHASE_MSGIN
;
2181 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2182 dprintk(NDEBUG_EXTENDED
, "scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2183 (int)extended_msg
[1], (int)extended_msg
[2]);
2185 if (!len
&& extended_msg
[1] > 0 &&
2186 extended_msg
[1] <= sizeof(extended_msg
) - 2) {
2187 /* Accept third byte by clearing ACK */
2188 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2189 len
= extended_msg
[1] - 1;
2190 data
= extended_msg
+ 3;
2191 phase
= PHASE_MSGIN
;
2193 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2194 dprintk(NDEBUG_EXTENDED
, "scsi%d: message received, residual %d\n",
2197 switch (extended_msg
[2]) {
2200 case EXTENDED_MODIFY_DATA_POINTER
:
2201 case EXTENDED_EXTENDED_IDENTIFY
:
2205 printk(KERN_NOTICE
"scsi%d: error receiving "
2206 "extended message\n", HOSTNO
);
2209 printk(KERN_NOTICE
"scsi%d: extended message "
2210 "code %02x length %d is too long\n",
2211 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2215 spin_lock_irq(&hostdata
->lock
);
2216 if (!hostdata
->connected
)
2219 /* Fall through to reject message */
2222 * If we get something weird that we aren't expecting,
2227 printk(KERN_INFO
"scsi%d: rejecting message ",
2229 spi_print_msg(extended_msg
);
2231 } else if (tmp
!= EXTENDED_MESSAGE
)
2232 scmd_printk(KERN_INFO
, cmd
,
2233 "rejecting unknown message %02x\n",
2236 scmd_printk(KERN_INFO
, cmd
,
2237 "rejecting unknown extended message code %02x, length %d\n",
2238 extended_msg
[1], extended_msg
[0]);
2240 msgout
= MESSAGE_REJECT
;
2241 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2243 } /* switch (tmp) */
2248 hostdata
->last_message
= msgout
;
2249 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2250 if (msgout
== ABORT
) {
2254 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2256 hostdata
->connected
= NULL
;
2257 cmd
->result
= DID_ERROR
<< 16;
2258 maybe_release_dma_irq(instance
);
2259 cmd
->scsi_done(cmd
);
2260 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2269 * XXX for performance reasons, on machines with a
2270 * PSEUDO-DMA architecture we should probably
2271 * use the dma transfer function.
2273 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2278 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2279 cmd
->SCp
.Status
= tmp
;
2282 printk("scsi%d: unknown phase\n", HOSTNO
);
2283 NCR5380_dprint(NDEBUG_ANY
, instance
);
2284 } /* switch(phase) */
2286 spin_unlock_irq(&hostdata
->lock
);
2287 NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
2288 spin_lock_irq(&hostdata
->lock
);
2294 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2296 * Purpose : does reselection, initializing the instance->connected
2297 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2298 * nexus has been reestablished,
2300 * Inputs : instance - this instance of the NCR5380.
2305 /* it might eventually prove necessary to do a dma setup on
2306 reselection, but it doesn't seem to be needed now -- sam */
2308 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2310 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2311 unsigned char target_mask
;
2316 unsigned char msg
[3];
2317 int __maybe_unused len
;
2318 unsigned char __maybe_unused
*data
, __maybe_unused phase
;
2319 struct scsi_cmnd
*tmp
= NULL
, *prev
;
2322 * Disable arbitration, etc. since the host adapter obviously
2323 * lost, and tell an interrupted NCR5380_select() to restart.
2326 NCR5380_write(MODE_REG
, MR_BASE
);
2328 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2330 dprintk(NDEBUG_RESELECTION
, "scsi%d: reselect\n", HOSTNO
);
2333 * At this point, we have detected that our SCSI ID is on the bus,
2334 * SEL is true and BSY was false for at least one bus settle delay
2337 * We must assert BSY ourselves, until the target drops the SEL
2341 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2342 if (NCR5380_poll_politely(instance
,
2343 STATUS_REG
, SR_SEL
, 0, 2 * HZ
) < 0) {
2344 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2347 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2350 * Wait for target to go into MSGIN.
2353 if (NCR5380_poll_politely(instance
,
2354 STATUS_REG
, SR_REQ
, SR_REQ
, 2 * HZ
) < 0) {
2359 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2360 /* acknowledge toggle to MSGIN */
2361 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(PHASE_MSGIN
));
2363 /* peek at the byte without really hitting the bus */
2364 msg
[0] = NCR5380_read(CURRENT_SCSI_DATA_REG
);
2368 phase
= PHASE_MSGIN
;
2369 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2377 if (!(msg
[0] & 0x80)) {
2378 shost_printk(KERN_ERR
, instance
, "expecting IDENTIFY message, got ");
2384 lun
= msg
[0] & 0x07;
2386 #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
2387 /* If the phase is still MSGIN, the target wants to send some more
2388 * messages. In case it supports tagged queuing, this is probably a
2389 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2392 if (phase
== PHASE_MSGIN
&& (hostdata
->flags
& FLAG_TAGGED_QUEUING
)) {
2393 /* Accept previous IDENTIFY message by clearing ACK */
2394 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2397 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2398 msg
[1] == SIMPLE_QUEUE_TAG
)
2400 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at "
2401 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2406 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2407 * just reestablished, and remove it from the disconnected queue.
2410 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2411 tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
2412 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== (u8
)tmp
->device
->lun
)
2414 && (tag
== tmp
->tag
)
2418 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
2419 SET_NEXT(prev
, NEXT(tmp
));
2421 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, NEXT(tmp
));
2422 hostdata
->disconnected_queue
= NEXT(tmp
);
2424 SET_NEXT(tmp
, NULL
);
2430 dsprintk(NDEBUG_RESELECTION
| NDEBUG_QUEUES
, instance
,
2431 "reselect: removed %p from disconnected queue\n", tmp
);
2435 shost_printk(KERN_ERR
, instance
, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n",
2436 target_mask
, lun
, tag
);
2438 shost_printk(KERN_ERR
, instance
, "target bitmask 0x%02x lun %d not in disconnected queue.\n",
2442 * Since we have an established nexus that we can't do anything
2443 * with, we must abort it.
2449 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2450 /* engage dma setup for the command we just saw */
2453 unsigned long count
;
2455 if (!tmp
->SCp
.this_residual
&& tmp
->SCp
.buffers_residual
) {
2456 count
= tmp
->SCp
.buffer
->length
;
2457 d
= sg_virt(tmp
->SCp
.buffer
);
2459 count
= tmp
->SCp
.this_residual
;
2462 /* setup this command for dma if not already */
2463 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= tmp
)) {
2464 sun3scsi_dma_setup(d
, count
, rq_data_dir(tmp
->request
));
2465 sun3_dma_setup_done
= tmp
;
2469 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2472 /* Accept message by clearing ACK */
2473 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2475 #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
2476 /* If the phase is still MSGIN, the target wants to send some more
2477 * messages. In case it supports tagged queuing, this is probably a
2478 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2481 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2482 /* Accept previous IDENTIFY message by clearing ACK */
2483 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2486 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2487 msg
[1] == SIMPLE_QUEUE_TAG
)
2489 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n"
2490 HOSTNO
, target_mask
, lun
, tag
);
2494 hostdata
->connected
= tmp
;
2495 dprintk(NDEBUG_RESELECTION
, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2496 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
, tmp
->tag
);
2501 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
2503 * Purpose : abort a command
2505 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
2506 * host byte of the result field to, if zero DID_ABORTED is
2509 * Returns : SUCCESS - success, FAILED on failure.
2511 * XXX - there is no way to abort the command that is currently
2512 * connected, you have to wait for it to complete. If this is
2513 * a problem, we could implement longjmp() / setjmp(), setjmp()
2514 * called where the loop started in NCR5380_main().
2518 int NCR5380_abort(struct scsi_cmnd
*cmd
)
2520 struct Scsi_Host
*instance
= cmd
->device
->host
;
2521 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2522 struct scsi_cmnd
*tmp
, **prev
;
2523 unsigned long flags
;
2525 scmd_printk(KERN_NOTICE
, cmd
, "aborting command\n");
2527 spin_lock_irqsave(&hostdata
->lock
, flags
);
2529 NCR5380_dprint(NDEBUG_ANY
, instance
);
2530 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
2532 dprintk(NDEBUG_ABORT
, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2533 NCR5380_read(BUS_AND_STATUS_REG
),
2534 NCR5380_read(STATUS_REG
));
2538 * Case 1 : If the command is the currently executing command,
2539 * we'll set the aborted flag and return control so that
2540 * information transfer routine can exit cleanly.
2543 if (hostdata
->connected
== cmd
) {
2545 dprintk(NDEBUG_ABORT
, "scsi%d: aborting connected command\n", HOSTNO
);
2547 * We should perform BSY checking, and make sure we haven't slipped
2551 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2553 * Since we can't change phases until we've completed the current
2554 * handshake, we have to source or sink a byte of data if the current
2555 * phase is not MSGOUT.
2559 * Return control to the executing NCR drive so we can clear the
2560 * aborted flag and get back into our main loop.
2563 if (do_abort(instance
) == 0) {
2564 hostdata
->connected
= NULL
;
2565 cmd
->result
= DID_ABORT
<< 16;
2569 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2571 maybe_release_dma_irq(instance
);
2572 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2573 cmd
->scsi_done(cmd
);
2576 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2577 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2584 * Case 2 : If the command hasn't been issued yet, we simply remove it
2585 * from the issue queue.
2587 for (prev
= (struct scsi_cmnd
**)&(hostdata
->issue_queue
),
2588 tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
2589 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2591 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2592 (*prev
) = NEXT(tmp
);
2593 SET_NEXT(tmp
, NULL
);
2594 tmp
->result
= DID_ABORT
<< 16;
2595 maybe_release_dma_irq(instance
);
2596 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2597 dprintk(NDEBUG_ABORT
, "scsi%d: abort removed command from issue queue.\n",
2599 /* Tagged queuing note: no tag to free here, hasn't been assigned
2601 tmp
->scsi_done(tmp
);
2607 * Case 3 : If any commands are connected, we're going to fail the abort
2608 * and let the high level SCSI driver retry at a later time or
2611 * Timeouts, and therefore aborted commands, will be highly unlikely
2612 * and handling them cleanly in this situation would make the common
2613 * case of noresets less efficient, and would pollute our code. So,
2617 if (hostdata
->connected
) {
2618 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2619 dprintk(NDEBUG_ABORT
, "scsi%d: abort failed, command connected.\n", HOSTNO
);
2624 * Case 4: If the command is currently disconnected from the bus, and
2625 * there are no connected commands, we reconnect the I_T_L or
2626 * I_T_L_Q nexus associated with it, go into message out, and send
2629 * This case is especially ugly. In order to reestablish the nexus, we
2630 * need to call NCR5380_select(). The easiest way to implement this
2631 * function was to abort if the bus was busy, and let the interrupt
2632 * handler triggered on the SEL for reselect take care of lost arbitrations
2633 * where necessary, meaning interrupts need to be enabled.
2635 * When interrupts are enabled, the queues may change - so we
2636 * can't remove it from the disconnected queue before selecting it
2637 * because that could cause a failure in hashing the nexus if that
2638 * device reselected.
2640 * Since the queues may change, we can't use the pointers from when we
2643 * So, we must first locate the command, and if NCR5380_select()
2644 * succeeds, then issue the abort, relocate the command and remove
2645 * it from the disconnected queue.
2648 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; tmp
;
2651 dprintk(NDEBUG_ABORT
, "scsi%d: aborting disconnected command.\n", HOSTNO
);
2653 if (NCR5380_select(instance
, cmd
)) {
2654 spin_unlock_irq(&hostdata
->lock
);
2657 dprintk(NDEBUG_ABORT
, "scsi%d: nexus reestablished.\n", HOSTNO
);
2661 for (prev
= (struct scsi_cmnd
**)&(hostdata
->disconnected_queue
),
2662 tmp
= (struct scsi_cmnd
*)hostdata
->disconnected_queue
;
2663 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2665 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2667 SET_NEXT(tmp
, NULL
);
2668 tmp
->result
= DID_ABORT
<< 16;
2669 /* We must unlock the tag/LUN immediately here, since the
2670 * target goes to BUS FREE and doesn't send us another
2671 * message (COMMAND_COMPLETE or the like)
2676 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2678 maybe_release_dma_irq(instance
);
2679 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2680 tmp
->scsi_done(tmp
);
2687 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2688 * possible at all) At least, we should check if the lock could be
2689 * released after the abort, in case it is kept due to some bug.
2691 maybe_release_dma_irq(instance
);
2692 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2695 * Case 5 : If we reached this point, the command was not found in any of
2698 * We probably reached this point because of an unlikely race condition
2699 * between the command completing successfully and the abortion code,
2700 * so we won't panic, but we will notify the user in case something really
2704 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO
);
2711 * NCR5380_bus_reset - reset the SCSI bus
2712 * @cmd: SCSI command undergoing EH
2717 static int NCR5380_bus_reset(struct scsi_cmnd
*cmd
)
2719 struct Scsi_Host
*instance
= cmd
->device
->host
;
2720 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2722 unsigned long flags
;
2724 spin_lock_irqsave(&hostdata
->lock
, flags
);
2726 #if (NDEBUG & NDEBUG_ANY)
2727 scmd_printk(KERN_INFO
, cmd
, "performing bus reset\n");
2729 NCR5380_dprint(NDEBUG_ANY
, instance
);
2730 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
2734 /* reset NCR registers */
2735 NCR5380_write(MODE_REG
, MR_BASE
);
2736 NCR5380_write(TARGET_COMMAND_REG
, 0);
2737 NCR5380_write(SELECT_ENABLE_REG
, 0);
2739 /* After the reset, there are no more connected or disconnected commands
2740 * and no busy units; so clear the low-level status here to avoid
2741 * conflicts when the mid-level code tries to wake up the affected
2745 if (hostdata
->issue_queue
)
2746 dsprintk(NDEBUG_ABORT
, instance
, "reset aborted issued command(s)\n");
2747 if (hostdata
->connected
)
2748 dsprintk(NDEBUG_ABORT
, instance
, "reset aborted a connected command\n");
2749 if (hostdata
->disconnected_queue
)
2750 dsprintk(NDEBUG_ABORT
, instance
, "reset aborted disconnected command(s)\n");
2752 hostdata
->issue_queue
= NULL
;
2753 hostdata
->connected
= NULL
;
2754 hostdata
->disconnected_queue
= NULL
;
2756 free_all_tags(hostdata
);
2758 for (i
= 0; i
< 8; ++i
)
2759 hostdata
->busy
[i
] = 0;
2761 hostdata
->dma_len
= 0;
2764 maybe_release_dma_irq(instance
);
2765 spin_unlock_irqrestore(&hostdata
->lock
, flags
);