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. */
74 * This is a generic 5380 driver. To use it on a different platform,
75 * one simply writes appropriate system specific macros (ie, data
76 * transfer - some PC's will use the I/O bus, 68K's must use
77 * memory mapped) and drops this file in their 'C' wrapper.
79 * As far as command queueing, two queues are maintained for
80 * each 5380 in the system - commands that haven't been issued yet,
81 * and commands that are currently executing. This means that an
82 * unlimited number of commands may be queued, letting
83 * more commands propagate from the higher driver levels giving higher
84 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
85 * allowing multiple commands to propagate all the way to a SCSI-II device
86 * while a command is already executing.
89 * Issues specific to the NCR5380 :
91 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
92 * piece of hardware that requires you to sit in a loop polling for
93 * the REQ signal as long as you are connected. Some devices are
94 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
95 * while doing long seek operations. [...] These
96 * broken devices are the exception rather than the rule and I'd rather
97 * spend my time optimizing for the normal case.
101 * At the heart of the design is a coroutine, NCR5380_main,
102 * which is started from a workqueue for each NCR5380 host in the
103 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
104 * removing the commands from the issue queue and calling
105 * NCR5380_select() if a nexus is not established.
107 * Once a nexus is established, the NCR5380_information_transfer()
108 * phase goes through the various phases as instructed by the target.
109 * if the target goes into MSG IN and sends a DISCONNECT message,
110 * the command structure is placed into the per instance disconnected
111 * queue, and NCR5380_main tries to find more work. If the target is
112 * idle for too long, the system will try to sleep.
114 * If a command has disconnected, eventually an interrupt will trigger,
115 * calling NCR5380_intr() which will in turn call NCR5380_reselect
116 * to reestablish a nexus. This will run main if necessary.
118 * On command termination, the done function will be called as
121 * SCSI pointers are maintained in the SCp field of SCSI command
122 * structures, being initialized after the command is connected
123 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
124 * Note that in violation of the standard, an implicit SAVE POINTERS operation
125 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
130 * This file a skeleton Linux SCSI driver for the NCR 5380 series
131 * of chips. To use it, you write an architecture specific functions
132 * and macros and include this file in your driver.
134 * These macros control options :
135 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
136 * for commands that return with a CHECK CONDITION status.
138 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
141 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
143 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
145 * These macros MUST be defined :
147 * NCR5380_read(register) - read from the specified register
149 * NCR5380_write(register, value) - write to the specific register
151 * NCR5380_implementation_fields - additional fields needed for this
152 * specific implementation of the NCR5380
154 * Either real DMA *or* pseudo DMA may be implemented
156 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
157 * Note that the DMA setup functions should return the number of bytes
158 * that they were able to program the controller for.
160 * Also note that generic i386/PC versions of these macros are
161 * available as NCR5380_i386_dma_write_setup,
162 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
164 * NCR5380_dma_write_setup(instance, src, count) - initialize
165 * NCR5380_dma_read_setup(instance, dst, count) - initialize
166 * NCR5380_dma_residual(instance); - residual count
169 * NCR5380_pwrite(instance, src, count)
170 * NCR5380_pread(instance, dst, count);
172 * The generic driver is initialized by calling NCR5380_init(instance),
173 * after setting the appropriate host specific fields and ID. If the
174 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
175 * possible) function may be used.
178 #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
179 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
180 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble)
182 #define HOSTNO instance->host_no
184 static int do_abort(struct Scsi_Host
*);
185 static void do_reset(struct Scsi_Host
*);
190 * Functions for handling tagged queuing
191 * =====================================
193 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
195 * Using consecutive numbers for the tags is no good idea in my eyes. There
196 * could be wrong re-usings if the counter (8 bit!) wraps and some early
197 * command has been preempted for a long time. My solution: a bitfield for
198 * remembering used tags.
200 * There's also the problem that each target has a certain queue size, but we
201 * cannot know it in advance :-( We just see a QUEUE_FULL status being
202 * returned. So, in this case, the driver internal queue size assumption is
203 * reduced to the number of active tags if QUEUE_FULL is returned by the
206 * We're also not allowed running tagged commands as long as an untagged
207 * command is active. And REQUEST SENSE commands after a contingent allegiance
208 * condition _must_ be untagged. To keep track whether an untagged command has
209 * been issued, the host->busy array is still employed, as it is without
210 * support for tagged queuing.
212 * One could suspect that there are possible race conditions between
213 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
214 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
215 * which already guaranteed to be running at most once. It is also the only
216 * place where tags/LUNs are allocated. So no other allocation can slip
217 * between that pair, there could only happen a reselection, which can free a
218 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
219 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
222 static void __init
init_tags(struct NCR5380_hostdata
*hostdata
)
225 struct tag_alloc
*ta
;
227 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
230 for (target
= 0; target
< 8; ++target
) {
231 for (lun
= 0; lun
< 8; ++lun
) {
232 ta
= &hostdata
->TagAlloc
[target
][lun
];
233 bitmap_zero(ta
->allocated
, MAX_TAGS
);
234 ta
->nr_allocated
= 0;
235 /* At the beginning, assume the maximum queue size we could
236 * support (MAX_TAGS). This value will be decreased if the target
237 * returns QUEUE_FULL status.
239 ta
->queue_size
= MAX_TAGS
;
245 /* Check if we can issue a command to this LUN: First see if the LUN is marked
246 * busy by an untagged command. If the command should use tagged queuing, also
247 * check that there is a free tag and the target's queue won't overflow. This
248 * function should be called with interrupts disabled to avoid race
252 static int is_lun_busy(struct scsi_cmnd
*cmd
, int should_be_tagged
)
254 u8 lun
= cmd
->device
->lun
;
255 struct Scsi_Host
*instance
= cmd
->device
->host
;
256 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
258 if (hostdata
->busy
[cmd
->device
->id
] & (1 << lun
))
260 if (!should_be_tagged
||
261 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
262 !cmd
->device
->tagged_supported
)
264 if (hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].nr_allocated
>=
265 hostdata
->TagAlloc
[scmd_id(cmd
)][lun
].queue_size
) {
266 dsprintk(NDEBUG_TAGS
, instance
, "target %d lun %d: no free tags\n",
274 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
275 * must be called before!), or reserve the LUN in 'busy' if the command is
279 static void cmd_get_tag(struct scsi_cmnd
*cmd
, int should_be_tagged
)
281 u8 lun
= cmd
->device
->lun
;
282 struct Scsi_Host
*instance
= cmd
->device
->host
;
283 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
285 /* If we or the target don't support tagged queuing, allocate the LUN for
286 * an untagged command.
288 if (!should_be_tagged
||
289 !(hostdata
->flags
& FLAG_TAGGED_QUEUING
) ||
290 !cmd
->device
->tagged_supported
) {
292 hostdata
->busy
[cmd
->device
->id
] |= (1 << lun
);
293 dsprintk(NDEBUG_TAGS
, instance
, "target %d lun %d now allocated by untagged command\n",
296 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
298 cmd
->tag
= find_first_zero_bit(ta
->allocated
, MAX_TAGS
);
299 set_bit(cmd
->tag
, ta
->allocated
);
301 dsprintk(NDEBUG_TAGS
, instance
, "using tag %d for target %d lun %d (%d tags allocated)\n",
302 cmd
->tag
, scmd_id(cmd
), lun
, ta
->nr_allocated
);
307 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
311 static void cmd_free_tag(struct scsi_cmnd
*cmd
)
313 u8 lun
= cmd
->device
->lun
;
314 struct Scsi_Host
*instance
= cmd
->device
->host
;
315 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
317 if (cmd
->tag
== TAG_NONE
) {
318 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << lun
);
319 dsprintk(NDEBUG_TAGS
, instance
, "target %d lun %d untagged cmd freed\n",
321 } else if (cmd
->tag
>= MAX_TAGS
) {
322 shost_printk(KERN_NOTICE
, instance
,
323 "trying to free bad tag %d!\n", cmd
->tag
);
325 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][lun
];
326 clear_bit(cmd
->tag
, ta
->allocated
);
328 dsprintk(NDEBUG_TAGS
, instance
, "freed tag %d for target %d lun %d\n",
329 cmd
->tag
, scmd_id(cmd
), lun
);
334 static void free_all_tags(struct NCR5380_hostdata
*hostdata
)
337 struct tag_alloc
*ta
;
339 if (!(hostdata
->flags
& FLAG_TAGGED_QUEUING
))
342 for (target
= 0; target
< 8; ++target
) {
343 for (lun
= 0; lun
< 8; ++lun
) {
344 ta
= &hostdata
->TagAlloc
[target
][lun
];
345 bitmap_zero(ta
->allocated
, MAX_TAGS
);
346 ta
->nr_allocated
= 0;
351 #endif /* SUPPORT_TAGS */
355 * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd )
357 * Purpose: Try to merge several scatter-gather requests into one DMA
358 * transfer. This is possible if the scatter buffers lie on
359 * physical contiguous addresses.
361 * Parameters: struct scsi_cmnd *cmd
362 * The command to work on. The first scatter buffer's data are
363 * assumed to be already transferred into ptr/this_residual.
366 static void merge_contiguous_buffers(struct scsi_cmnd
*cmd
)
368 #if !defined(CONFIG_SUN3)
369 unsigned long endaddr
;
370 #if (NDEBUG & NDEBUG_MERGING)
371 unsigned long oldlen
= cmd
->SCp
.this_residual
;
375 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
376 cmd
->SCp
.buffers_residual
&&
377 virt_to_phys(sg_virt(&cmd
->SCp
.buffer
[1])) == endaddr
;) {
378 dprintk(NDEBUG_MERGING
, "VTOP(%p) == %08lx -> merging\n",
379 page_address(sg_page(&cmd
->SCp
.buffer
[1])), endaddr
);
380 #if (NDEBUG & NDEBUG_MERGING)
384 --cmd
->SCp
.buffers_residual
;
385 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
386 endaddr
+= cmd
->SCp
.buffer
->length
;
388 #if (NDEBUG & NDEBUG_MERGING)
389 if (oldlen
!= cmd
->SCp
.this_residual
)
390 dprintk(NDEBUG_MERGING
, "merged %d buffers from %p, new length %08x\n",
391 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
393 #endif /* !defined(CONFIG_SUN3) */
397 * initialize_SCp - init the scsi pointer field
398 * @cmd: command block to set up
400 * Set up the internal fields in the SCSI command.
403 static inline void initialize_SCp(struct scsi_cmnd
*cmd
)
406 * Initialize the Scsi Pointer field so that all of the commands in the
407 * various queues are valid.
410 if (scsi_bufflen(cmd
)) {
411 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
412 cmd
->SCp
.buffers_residual
= scsi_sg_count(cmd
) - 1;
413 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
414 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
415 /* ++roman: Try to merge some scatter-buffers if they are at
416 * contiguous physical addresses.
418 merge_contiguous_buffers(cmd
);
420 cmd
->SCp
.buffer
= NULL
;
421 cmd
->SCp
.buffers_residual
= 0;
423 cmd
->SCp
.this_residual
= 0;
428 * NCR5380_poll_politely2 - wait for two chip register values
429 * @instance: controller to poll
430 * @reg1: 5380 register to poll
431 * @bit1: Bitmask to check
432 * @val1: Expected value
433 * @reg2: Second 5380 register to poll
434 * @bit2: Second bitmask to check
435 * @val2: Second expected value
436 * @wait: Time-out in jiffies
438 * Polls the chip in a reasonably efficient manner waiting for an
439 * event to occur. After a short quick poll we begin to yield the CPU
440 * (if possible). In irq contexts the time-out is arbitrarily limited.
441 * Callers may hold locks as long as they are held in irq mode.
443 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT.
446 static int NCR5380_poll_politely2(struct Scsi_Host
*instance
,
447 int reg1
, int bit1
, int val1
,
448 int reg2
, int bit2
, int val2
, int wait
)
450 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
451 unsigned long deadline
= jiffies
+ wait
;
454 /* Busy-wait for up to 10 ms */
455 n
= min(10000U, jiffies_to_usecs(wait
));
456 n
*= hostdata
->accesses_per_ms
;
459 if ((NCR5380_read(reg1
) & bit1
) == val1
)
461 if ((NCR5380_read(reg2
) & bit2
) == val2
)
466 if (irqs_disabled() || in_interrupt())
469 /* Repeatedly sleep for 1 ms until deadline */
470 while (time_is_after_jiffies(deadline
)) {
471 schedule_timeout_uninterruptible(1);
472 if ((NCR5380_read(reg1
) & bit1
) == val1
)
474 if ((NCR5380_read(reg2
) & bit2
) == val2
)
481 static inline int NCR5380_poll_politely(struct Scsi_Host
*instance
,
482 int reg
, int bit
, int val
, int wait
)
484 return NCR5380_poll_politely2(instance
, reg
, bit
, val
,
485 reg
, bit
, val
, wait
);
493 { SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
494 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
495 { SR_SEL
, "SEL" }, {0, NULL
}
497 {BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}
499 {ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
500 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
501 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
504 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"}, {MR_TARGET
, "MODE TARGET"},
505 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR
,
506 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR
,"MODE EOP INTR"},
507 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
508 {MR_DMA_MODE
, "MODE DMA"}, {MR_ARBITRATE
, "MODE ARBITRATION"},
513 * NCR5380_print - print scsi bus signals
514 * @instance: adapter state to dump
516 * Print the SCSI bus signals for debugging purposes
519 static void NCR5380_print(struct Scsi_Host
*instance
)
521 unsigned char status
, data
, basr
, mr
, icr
, i
;
523 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
524 status
= NCR5380_read(STATUS_REG
);
525 mr
= NCR5380_read(MODE_REG
);
526 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
527 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
529 printk("STATUS_REG: %02x ", status
);
530 for (i
= 0; signals
[i
].mask
; ++i
)
531 if (status
& signals
[i
].mask
)
532 printk(",%s", signals
[i
].name
);
533 printk("\nBASR: %02x ", basr
);
534 for (i
= 0; basrs
[i
].mask
; ++i
)
535 if (basr
& basrs
[i
].mask
)
536 printk(",%s", basrs
[i
].name
);
537 printk("\nICR: %02x ", icr
);
538 for (i
= 0; icrs
[i
].mask
; ++i
)
539 if (icr
& icrs
[i
].mask
)
540 printk(",%s", icrs
[i
].name
);
541 printk("\nMODE: %02x ", mr
);
542 for (i
= 0; mrs
[i
].mask
; ++i
)
543 if (mr
& mrs
[i
].mask
)
544 printk(",%s", mrs
[i
].name
);
552 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
553 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
554 {PHASE_UNKNOWN
, "UNKNOWN"}
558 * NCR5380_print_phase - show SCSI phase
559 * @instance: adapter to dump
561 * Print the current SCSI phase for debugging purposes
566 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
568 unsigned char status
;
571 status
= NCR5380_read(STATUS_REG
);
572 if (!(status
& SR_REQ
))
573 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
575 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
576 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
578 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
585 * NCR58380_info - report driver and host information
586 * @instance: relevant scsi host instance
588 * For use as the host template info() handler.
593 static const char *NCR5380_info(struct Scsi_Host
*instance
)
595 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
597 return hostdata
->info
;
600 static void prepare_info(struct Scsi_Host
*instance
)
602 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
604 snprintf(hostdata
->info
, sizeof(hostdata
->info
),
605 "%s, io_port 0x%lx, n_io_port %d, "
606 "base 0x%lx, irq %d, "
607 "can_queue %d, cmd_per_lun %d, "
608 "sg_tablesize %d, this_id %d, "
611 instance
->hostt
->name
, instance
->io_port
, instance
->n_io_port
,
612 instance
->base
, instance
->irq
,
613 instance
->can_queue
, instance
->cmd_per_lun
,
614 instance
->sg_tablesize
, instance
->this_id
,
615 hostdata
->flags
& FLAG_TAGGED_QUEUING
? "TAGGED_QUEUING " : "",
616 hostdata
->flags
& FLAG_TOSHIBA_DELAY
? "TOSHIBA_DELAY " : "",
633 * NCR5380_init - initialise an NCR5380
634 * @instance: adapter to configure
635 * @flags: control flags
637 * Initializes *instance and corresponding 5380 chip,
638 * with flags OR'd into the initial flags value.
640 * Notes : I assume that the host, hostno, and id bits have been
641 * set correctly. I don't care about the irq and other fields.
643 * Returns 0 for success
646 static int __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
648 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
650 unsigned long deadline
;
652 hostdata
->host
= instance
;
653 hostdata
->id_mask
= 1 << instance
->this_id
;
654 hostdata
->id_higher_mask
= 0;
655 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
656 if (i
> hostdata
->id_mask
)
657 hostdata
->id_higher_mask
|= i
;
658 for (i
= 0; i
< 8; ++i
)
659 hostdata
->busy
[i
] = 0;
663 #if defined (REAL_DMA)
664 hostdata
->dma_len
= 0;
666 spin_lock_init(&hostdata
->lock
);
667 hostdata
->connected
= NULL
;
668 hostdata
->issue_queue
= NULL
;
669 hostdata
->disconnected_queue
= NULL
;
670 hostdata
->flags
= flags
;
672 INIT_WORK(&hostdata
->main_task
, NCR5380_main
);
673 hostdata
->work_q
= alloc_workqueue("ncr5380_%d",
674 WQ_UNBOUND
| WQ_MEM_RECLAIM
,
675 1, instance
->host_no
);
676 if (!hostdata
->work_q
)
679 prepare_info(instance
);
681 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
682 NCR5380_write(MODE_REG
, MR_BASE
);
683 NCR5380_write(TARGET_COMMAND_REG
, 0);
684 NCR5380_write(SELECT_ENABLE_REG
, 0);
686 /* Calibrate register polling loop */
688 deadline
= jiffies
+ 1;
691 } while (time_is_after_jiffies(deadline
));
692 deadline
+= msecs_to_jiffies(256);
694 NCR5380_read(STATUS_REG
);
697 } while (time_is_after_jiffies(deadline
));
698 hostdata
->accesses_per_ms
= i
/ 256;
704 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
705 * @instance: adapter to check
707 * If the system crashed, it may have crashed with a connected target and
708 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
709 * currently established nexus, which we know nothing about. Failing that
712 * Note that a bus reset will cause the chip to assert IRQ.
714 * Returns 0 if successful, otherwise -ENXIO.
717 static int NCR5380_maybe_reset_bus(struct Scsi_Host
*instance
)
719 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
722 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) && pass
<= 6; ++pass
) {
727 shost_printk(KERN_ERR
, instance
, "SCSI bus busy, waiting up to five seconds\n");
728 NCR5380_poll_politely(instance
,
729 STATUS_REG
, SR_BSY
, 0, 5 * HZ
);
732 shost_printk(KERN_ERR
, instance
, "bus busy, attempting abort\n");
736 shost_printk(KERN_ERR
, instance
, "bus busy, attempting reset\n");
738 /* Wait after a reset; the SCSI standard calls for
739 * 250ms, we wait 500ms to be on the safe side.
740 * But some Toshiba CD-ROMs need ten times that.
742 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
748 shost_printk(KERN_ERR
, instance
, "bus locked solid\n");
756 * NCR5380_exit - remove an NCR5380
757 * @instance: adapter to remove
759 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
762 static void NCR5380_exit(struct Scsi_Host
*instance
)
764 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
766 cancel_work_sync(&hostdata
->main_task
);
767 destroy_workqueue(hostdata
->work_q
);
771 * NCR5380_queue_command - queue a command
772 * @instance: the relevant SCSI adapter
775 * cmd is added to the per-instance issue queue, with minor
776 * twiddling done to the host specific fields of cmd. If the
777 * main coroutine is not running, it is restarted.
780 static int NCR5380_queue_command(struct Scsi_Host
*instance
,
781 struct scsi_cmnd
*cmd
)
783 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
784 struct scsi_cmnd
*tmp
;
787 #if (NDEBUG & NDEBUG_NO_WRITE)
788 switch (cmd
->cmnd
[0]) {
791 shost_printk(KERN_DEBUG
, instance
, "WRITE attempted with NDEBUG_NO_WRITE set\n");
792 cmd
->result
= (DID_ERROR
<< 16);
796 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
799 * We use the host_scribble field as a pointer to the next command
807 * Insert the cmd into the issue queue. Note that REQUEST SENSE
808 * commands are added to the head of the queue since any command will
809 * clear the contingent allegiance condition that exists and the
810 * sense data is only guaranteed to be valid while the condition exists.
813 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
814 * Otherwise a running NCR5380_main may steal the lock.
815 * Lock before actually inserting due to fairness reasons explained in
816 * atari_scsi.c. If we insert first, then it's impossible for this driver
817 * to release the lock.
818 * Stop timer for this command while waiting for the lock, or timeouts
819 * may happen (and they really do), and it's no good if the command doesn't
820 * appear in any of the queues.
821 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
822 * because also a timer int can trigger an abort or reset, which would
823 * alter queues and touch the lock.
825 if (!NCR5380_acquire_dma_irq(instance
))
826 return SCSI_MLQUEUE_HOST_BUSY
;
828 spin_lock_irqsave(&hostdata
->lock
, flags
);
831 * Insert the cmd into the issue queue. Note that REQUEST SENSE
832 * commands are added to the head of the queue since any command will
833 * clear the contingent allegiance condition that exists and the
834 * sense data is only guaranteed to be valid while the condition exists.
837 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
838 SET_NEXT(cmd
, hostdata
->issue_queue
);
839 hostdata
->issue_queue
= cmd
;
841 for (tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
842 NEXT(tmp
); tmp
= NEXT(tmp
))
846 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
848 dsprintk(NDEBUG_QUEUES
, instance
, "command %p added to %s of queue\n",
849 cmd
, (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
851 /* Kick off command processing */
852 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
856 static inline void maybe_release_dma_irq(struct Scsi_Host
*instance
)
858 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
860 /* Caller does the locking needed to set & test these data atomically */
861 if (!hostdata
->disconnected_queue
&&
862 !hostdata
->issue_queue
&&
863 !hostdata
->connected
&&
864 !hostdata
->retain_dma_intr
)
865 NCR5380_release_dma_irq(instance
);
869 * NCR5380_main - NCR state machines
871 * NCR5380_main is a coroutine that runs as long as more work can
872 * be done on the NCR5380 host adapters in a system. Both
873 * NCR5380_queue_command() and NCR5380_intr() will try to start it
874 * in case it is not running.
876 * Locks: called as its own thread with no locks held.
879 static void NCR5380_main(struct work_struct
*work
)
881 struct NCR5380_hostdata
*hostdata
=
882 container_of(work
, struct NCR5380_hostdata
, main_task
);
883 struct Scsi_Host
*instance
= hostdata
->host
;
884 struct scsi_cmnd
*tmp
, *prev
;
888 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
889 * because also a timer int can trigger an abort or reset, which can
890 * alter queues and touch the Falcon lock.
893 spin_lock_irq(&hostdata
->lock
);
897 if (!hostdata
->connected
) {
898 dprintk(NDEBUG_MAIN
, "scsi%d: not connected\n", HOSTNO
);
900 * Search through the issue_queue for a command destined
901 * for a target that's not busy.
903 #if (NDEBUG & NDEBUG_LISTS)
904 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
905 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
907 /*printk("%p ", tmp);*/
908 if ((tmp
== prev
) && tmp
)
910 /* else printk("\n"); */
912 for (tmp
= (struct scsi_cmnd
*) hostdata
->issue_queue
,
913 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
914 u8 lun
= tmp
->device
->lun
;
916 dsprintk(NDEBUG_QUEUES
, instance
, "main: tmp=%p target=%d busy=%d lun=%d\n",
917 tmp
, scmd_id(tmp
), hostdata
->busy
[scmd_id(tmp
)], lun
);
918 /* When we find one, remove it from the issue queue. */
921 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
923 !(hostdata
->busy
[tmp
->device
->id
] & (1 << lun
))
927 SET_NEXT(prev
, NEXT(tmp
));
929 hostdata
->issue_queue
= NEXT(tmp
);
932 dsprintk(NDEBUG_MAIN
| NDEBUG_QUEUES
,
933 instance
, "main: removed %p from issue queue %p\n",
936 hostdata
->retain_dma_intr
++;
939 * Attempt to establish an I_T_L nexus here.
940 * On success, instance->hostdata->connected is set.
941 * On failure, we must add the command back to the
942 * issue queue so we can keep trying.
945 * REQUEST SENSE commands are issued without tagged
946 * queueing, even on SCSI-II devices because the
947 * contingent allegiance condition exists for the
950 /* ++roman: ...and the standard also requires that
951 * REQUEST SENSE command are untagged.
955 cmd_get_tag(tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
957 if (!NCR5380_select(instance
, tmp
)) {
958 /* OK or bad target */
959 hostdata
->retain_dma_intr
--;
960 maybe_release_dma_irq(instance
);
963 SET_NEXT(tmp
, hostdata
->issue_queue
);
964 hostdata
->issue_queue
= tmp
;
965 dsprintk(NDEBUG_MAIN
| NDEBUG_QUEUES
,
966 instance
, "main: select() failed, %p returned to issue queue\n",
971 hostdata
->retain_dma_intr
--;
974 if (hostdata
->connected
)
976 } /* if target/lun/target queue is not busy */
977 } /* for issue_queue */
978 } /* if (!hostdata->connected) */
980 if (hostdata
->connected
982 && !hostdata
->dma_len
985 dprintk(NDEBUG_MAIN
, "scsi%d: main: performing information transfer\n",
987 NCR5380_information_transfer(instance
);
988 dprintk(NDEBUG_MAIN
, "scsi%d: main: done set false\n", HOSTNO
);
992 spin_unlock_irq(&hostdata
->lock
);
998 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1000 * Purpose : Called by interrupt handler when DMA finishes or a phase
1001 * mismatch occurs (which would finish the DMA transfer).
1003 * Inputs : instance - this instance of the NCR5380.
1007 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
1009 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1011 unsigned char **data
;
1013 int saved_data
= 0, overrun
= 0;
1016 if (hostdata
->read_overruns
) {
1017 p
= hostdata
->connected
->SCp
.phase
;
1020 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
1021 (BASR_PHASE_MATCH
|BASR_ACK
)) ==
1022 (BASR_PHASE_MATCH
|BASR_ACK
)) {
1023 saved_data
= NCR5380_read(INPUT_DATA_REG
);
1025 dprintk(NDEBUG_DMA
, "scsi%d: read overrun handled\n", HOSTNO
);
1030 #if defined(CONFIG_SUN3)
1031 if ((sun3scsi_dma_finish(rq_data_dir(hostdata
->connected
->request
)))) {
1032 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
1037 /* make sure we're not stuck in a data phase */
1038 if ((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
1039 (BASR_PHASE_MATCH
| BASR_ACK
)) {
1040 pr_err("scsi%d: BASR %02x\n", instance
->host_no
,
1041 NCR5380_read(BUS_AND_STATUS_REG
));
1042 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
1048 NCR5380_write(MODE_REG
, MR_BASE
);
1049 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1050 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1052 transferred
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1053 hostdata
->dma_len
= 0;
1055 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
1056 count
= &hostdata
->connected
->SCp
.this_residual
;
1057 *data
+= transferred
;
1058 *count
-= transferred
;
1060 if (hostdata
->read_overruns
) {
1063 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
1064 cnt
= toPIO
= hostdata
->read_overruns
;
1066 dprintk(NDEBUG_DMA
, "Got an input overrun, using saved byte\n");
1067 *(*data
)++ = saved_data
;
1072 dprintk(NDEBUG_DMA
, "Doing %d-byte PIO to 0x%08lx\n", cnt
, (long)*data
);
1073 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
);
1074 *count
-= toPIO
- cnt
;
1078 #endif /* REAL_DMA */
1082 * NCR5380_intr - generic NCR5380 irq handler
1083 * @irq: interrupt number
1084 * @dev_id: device info
1086 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1087 * from the disconnected queue, and restarting NCR5380_main()
1090 * The chip can assert IRQ in any of six different conditions. The IRQ flag
1091 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR).
1092 * Three of these six conditions are latched in the Bus and Status Register:
1093 * - End of DMA (cleared by ending DMA Mode)
1094 * - Parity error (cleared by reading RPIR)
1095 * - Loss of BSY (cleared by reading RPIR)
1096 * Two conditions have flag bits that are not latched:
1097 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode)
1098 * - Bus reset (non-maskable)
1099 * The remaining condition has no flag bit at all:
1100 * - Selection/reselection
1102 * Hence, establishing the cause(s) of any interrupt is partly guesswork.
1103 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor
1104 * claimed that "the design of the [DP8490] interrupt logic ensures
1105 * interrupts will not be lost (they can be on the DP5380)."
1106 * The L5380/53C80 datasheet from LOGIC Devices has more details.
1108 * Checking for bus reset by reading RST is futile because of interrupt
1109 * latency, but a bus reset will reset chip logic. Checking for parity error
1110 * is unnecessary because that interrupt is never enabled. A Loss of BSY
1111 * condition will clear DMA Mode. We can tell when this occurs because the
1112 * the Busy Monitor interrupt is enabled together with DMA Mode.
1115 static irqreturn_t
NCR5380_intr(int irq
, void *dev_id
)
1117 struct Scsi_Host
*instance
= dev_id
;
1118 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1121 unsigned long flags
;
1123 spin_lock_irqsave(&hostdata
->lock
, flags
);
1125 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1126 if (basr
& BASR_IRQ
) {
1127 unsigned char mr
= NCR5380_read(MODE_REG
);
1128 unsigned char sr
= NCR5380_read(STATUS_REG
);
1130 dprintk(NDEBUG_INTR
, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n",
1131 HOSTNO
, irq
, basr
, sr
, mr
);
1133 #if defined(REAL_DMA)
1134 if ((mr
& MR_DMA_MODE
) || (mr
& MR_MONITOR_BSY
)) {
1135 /* Probably End of DMA, Phase Mismatch or Loss of BSY.
1136 * We ack IRQ after clearing Mode Register. Workarounds
1137 * for End of DMA errata need to happen in DMA Mode.
1140 dprintk(NDEBUG_INTR
, "scsi%d: interrupt in DMA mode\n", HOSTNO
);
1142 if (hostdata
->connected
) {
1143 NCR5380_dma_complete(instance
);
1144 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
1146 NCR5380_write(MODE_REG
, MR_BASE
);
1147 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1150 #endif /* REAL_DMA */
1151 if ((NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_mask
) &&
1152 (sr
& (SR_SEL
| SR_IO
| SR_BSY
| SR_RST
)) == (SR_SEL
| SR_IO
)) {
1153 /* Probably reselected */
1154 NCR5380_write(SELECT_ENABLE_REG
, 0);
1155 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1157 dprintk(NDEBUG_INTR
, "scsi%d: interrupt with SEL and IO\n",
1160 if (!hostdata
->connected
) {
1161 NCR5380_reselect(instance
);
1162 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
1164 if (!hostdata
->connected
)
1165 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1167 /* Probably Bus Reset */
1168 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1170 dprintk(NDEBUG_INTR
, "scsi%d: unknown interrupt\n", HOSTNO
);
1171 #ifdef SUN3_SCSI_VME
1172 dregs
->csr
|= CSR_DMA_ENABLE
;
1177 shost_printk(KERN_NOTICE
, instance
, "interrupt without IRQ bit\n");
1178 #ifdef SUN3_SCSI_VME
1179 dregs
->csr
|= CSR_DMA_ENABLE
;
1183 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
1185 return IRQ_RETVAL(handled
);
1189 * Function : int NCR5380_select(struct Scsi_Host *instance,
1190 * struct scsi_cmnd *cmd)
1192 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1193 * including ARBITRATION, SELECTION, and initial message out for
1194 * IDENTIFY and queue messages.
1196 * Inputs : instance - instantiation of the 5380 driver on which this
1197 * target lives, cmd - SCSI command to execute.
1199 * Returns : -1 if selection failed but should be retried.
1200 * 0 if selection failed and should not be retried.
1201 * 0 if selection succeeded completely (hostdata->connected == cmd).
1204 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1205 * with registers as they should have been on entry - ie
1206 * SELECT_ENABLE will be set appropriately, the NCR5380
1207 * will cease to drive any SCSI bus signals.
1209 * If successful : I_T_L or I_T_L_Q nexus will be established,
1210 * instance->connected will be set to cmd.
1211 * SELECT interrupt will be disabled.
1213 * If failed (no target) : cmd->scsi_done() will be called, and the
1214 * cmd->result host byte set to DID_BAD_TARGET.
1217 static int NCR5380_select(struct Scsi_Host
*instance
, struct scsi_cmnd
*cmd
)
1219 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1220 unsigned char tmp
[3], phase
;
1221 unsigned char *data
;
1225 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
1226 dprintk(NDEBUG_ARBITRATION
, "scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1230 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1231 * data bus during SELECTION.
1234 NCR5380_write(TARGET_COMMAND_REG
, 0);
1237 * Start arbitration.
1240 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1241 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1243 /* The chip now waits for BUS FREE phase. Then after the 800 ns
1244 * Bus Free Delay, arbitration will begin.
1247 spin_unlock_irq(&hostdata
->lock
);
1248 err
= NCR5380_poll_politely2(instance
, MODE_REG
, MR_ARBITRATE
, 0,
1249 INITIATOR_COMMAND_REG
, ICR_ARBITRATION_PROGRESS
,
1250 ICR_ARBITRATION_PROGRESS
, HZ
);
1251 spin_lock_irq(&hostdata
->lock
);
1252 if (!(NCR5380_read(MODE_REG
) & MR_ARBITRATE
)) {
1253 /* Reselection interrupt */
1257 NCR5380_write(MODE_REG
, MR_BASE
);
1258 shost_printk(KERN_ERR
, instance
,
1259 "select: arbitration timeout\n");
1262 spin_unlock_irq(&hostdata
->lock
);
1264 /* The SCSI-2 arbitration delay is 2.4 us */
1267 /* Check for lost arbitration */
1268 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1269 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1270 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1271 NCR5380_write(MODE_REG
, MR_BASE
);
1272 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1274 spin_lock_irq(&hostdata
->lock
);
1278 /* After/during arbitration, BSY should be asserted.
1279 * IBM DPES-31080 Version S31Q works now
1280 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1282 NCR5380_write(INITIATOR_COMMAND_REG
,
1283 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1286 * Again, bus clear + bus settle time is 1.2us, however, this is
1287 * a minimum so we'll udelay ceil(1.2)
1290 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
1295 spin_lock_irq(&hostdata
->lock
);
1297 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */
1298 if (!(NCR5380_read(MODE_REG
) & MR_ARBITRATE
))
1301 dprintk(NDEBUG_ARBITRATION
, "scsi%d: won arbitration\n", HOSTNO
);
1304 * Now that we have won arbitration, start Selection process, asserting
1305 * the host and target ID's on the SCSI bus.
1308 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1311 * Raise ATN while SEL is true before BSY goes false from arbitration,
1312 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1313 * phase immediately after selection.
1316 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1317 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1318 NCR5380_write(MODE_REG
, MR_BASE
);
1321 * Reselect interrupts must be turned off prior to the dropping of BSY,
1322 * otherwise we will trigger an interrupt.
1324 NCR5380_write(SELECT_ENABLE_REG
, 0);
1326 spin_unlock_irq(&hostdata
->lock
);
1329 * The initiator shall then wait at least two deskew delays and release
1332 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1335 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1336 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1339 * Something weird happens when we cease to drive BSY - looks
1340 * like the board/chip is letting us do another read before the
1341 * appropriate propagation delay has expired, and we're confusing
1342 * a BSY signal from ourselves as the target's response to SELECTION.
1344 * A small delay (the 'C++' frontend breaks the pipeline with an
1345 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1346 * tighter 'C' code breaks and requires this) solves the problem -
1347 * the 1 us delay is arbitrary, and only used because this delay will
1348 * be the same on other platforms and since it works here, it should
1351 * wingel suggests that this could be due to failing to wait
1357 dprintk(NDEBUG_SELECTION
, "scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1360 * The SCSI specification calls for a 250 ms timeout for the actual
1364 err
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_BSY
, SR_BSY
,
1365 msecs_to_jiffies(250));
1367 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1368 spin_lock_irq(&hostdata
->lock
);
1369 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1370 NCR5380_reselect(instance
);
1371 if (!hostdata
->connected
)
1372 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1373 printk(KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1379 spin_lock_irq(&hostdata
->lock
);
1380 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1381 cmd
->result
= DID_BAD_TARGET
<< 16;
1385 cmd
->scsi_done(cmd
);
1386 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1387 dprintk(NDEBUG_SELECTION
, "scsi%d: target did not respond within 250ms\n", HOSTNO
);
1392 * No less than two deskew delays after the initiator detects the
1393 * BSY signal is true, it shall release the SEL signal and may
1394 * change the DATA BUS. -wingel
1399 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1402 * Since we followed the SCSI spec, and raised ATN while SEL
1403 * was true but before BSY was false during selection, the information
1404 * transfer phase should be a MESSAGE OUT phase so that we can send the
1407 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1408 * message (2 bytes) with a tag ID that we increment with every command
1409 * until it wraps back to 0.
1411 * XXX - it turns out that there are some broken SCSI-II devices,
1412 * which claim to support tagged queuing but fail when more than
1413 * some number of commands are issued at once.
1416 /* Wait for start of REQ/ACK handshake */
1418 err
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
1419 spin_lock_irq(&hostdata
->lock
);
1421 shost_printk(KERN_ERR
, instance
, "select: REQ timeout\n");
1422 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1423 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1427 dprintk(NDEBUG_SELECTION
, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1428 HOSTNO
, cmd
->device
->id
);
1429 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1432 if (cmd
->tag
!= TAG_NONE
) {
1433 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1441 #endif /* SUPPORT_TAGS */
1443 /* Send message(s) */
1445 phase
= PHASE_MSGOUT
;
1446 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1447 dprintk(NDEBUG_SELECTION
, "scsi%d: nexus established.\n", HOSTNO
);
1448 /* XXX need to handle errors here */
1450 hostdata
->connected
= cmd
;
1451 #ifndef SUPPORT_TAGS
1452 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1454 #ifdef SUN3_SCSI_VME
1455 dregs
->csr
|= CSR_INTR
;
1458 initialize_SCp(cmd
);
1464 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1465 * unsigned char *phase, int *count, unsigned char **data)
1467 * Purpose : transfers data in given phase using polled I/O
1469 * Inputs : instance - instance of driver, *phase - pointer to
1470 * what phase is expected, *count - pointer to number of
1471 * bytes to transfer, **data - pointer to data pointer.
1473 * Returns : -1 when different phase is entered without transferring
1474 * maximum number of bytes, 0 if all bytes are transferred or exit
1477 * Also, *phase, *count, *data are modified in place.
1479 * XXX Note : handling for bus free may be useful.
1483 * Note : this code is not as quick as it could be, however it
1484 * IS 100% reliable, and for the actual data transfer where speed
1485 * counts, we will always do a pseudo DMA or DMA transfer.
1488 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1489 unsigned char *phase
, int *count
,
1490 unsigned char **data
)
1492 register unsigned char p
= *phase
, tmp
;
1493 register int c
= *count
;
1494 register unsigned char *d
= *data
;
1497 * The NCR5380 chip will only drive the SCSI bus when the
1498 * phase specified in the appropriate bits of the TARGET COMMAND
1499 * REGISTER match the STATUS REGISTER
1502 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1506 * Wait for assertion of REQ, after which the phase bits will be
1510 if (NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
) < 0)
1513 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: REQ detected\n", HOSTNO
);
1515 /* Check for phase mismatch */
1516 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) != p
) {
1517 dprintk(NDEBUG_PIO
, "scsi%d: phase mismatch\n", HOSTNO
);
1518 NCR5380_dprint_phase(NDEBUG_PIO
, instance
);
1522 /* Do actual transfer from SCSI bus to / from memory */
1524 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1526 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1531 * The SCSI standard suggests that in MSGOUT phase, the initiator
1532 * should drop ATN on the last byte of the message phase
1533 * after REQ has been asserted for the handshake but before
1534 * the initiator raises ACK.
1538 if (!((p
& SR_MSG
) && c
> 1)) {
1539 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1540 NCR5380_dprint(NDEBUG_PIO
, instance
);
1541 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1542 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1544 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1545 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1546 NCR5380_dprint(NDEBUG_PIO
, instance
);
1547 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1548 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1551 NCR5380_dprint(NDEBUG_PIO
, instance
);
1552 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1555 if (NCR5380_poll_politely(instance
,
1556 STATUS_REG
, SR_REQ
, 0, 5 * HZ
) < 0)
1559 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: req false, handshake complete\n", HOSTNO
);
1562 * We have several special cases to consider during REQ/ACK handshaking :
1563 * 1. We were in MSGOUT phase, and we are on the last byte of the
1564 * message. ATN must be dropped as ACK is dropped.
1566 * 2. We are in a MSGIN phase, and we are on the last byte of the
1567 * message. We must exit with ACK asserted, so that the calling
1568 * code may raise ATN before dropping ACK to reject the message.
1570 * 3. ACK and ATN are clear and the target may proceed as normal.
1572 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1573 if (p
== PHASE_MSGOUT
&& c
> 1)
1574 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1576 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1580 dprintk(NDEBUG_PIO
, "scsi%d: residual %d\n", HOSTNO
, c
);
1584 tmp
= NCR5380_read(STATUS_REG
);
1585 /* The phase read from the bus is valid if either REQ is (already)
1586 * asserted or if ACK hasn't been released yet. The latter applies if
1587 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1589 if ((tmp
& SR_REQ
) || ((tmp
& SR_IO
) && c
== 0))
1590 *phase
= tmp
& PHASE_MASK
;
1592 *phase
= PHASE_UNKNOWN
;
1594 if (!c
|| (*phase
== p
))
1601 * do_reset - issue a reset command
1602 * @instance: adapter to reset
1604 * Issue a reset sequence to the NCR5380 and try and get the bus
1605 * back into sane shape.
1607 * This clears the reset interrupt flag because there may be no handler for
1608 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1609 * been installed. And when in EH we may have released the ST DMA interrupt.
1612 static void do_reset(struct Scsi_Host
*instance
)
1614 unsigned long flags
;
1616 local_irq_save(flags
);
1617 NCR5380_write(TARGET_COMMAND_REG
,
1618 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
1619 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
1621 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1622 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1623 local_irq_restore(flags
);
1627 * do_abort - abort the currently established nexus by going to
1628 * MESSAGE OUT phase and sending an ABORT message.
1629 * @instance: relevant scsi host instance
1631 * Returns 0 on success, -1 on failure.
1634 static int do_abort(struct Scsi_Host
*instance
)
1636 unsigned char tmp
, *msgptr
, phase
;
1640 /* Request message out phase */
1641 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1644 * Wait for the target to indicate a valid phase by asserting
1645 * REQ. Once this happens, we'll have either a MSGOUT phase
1646 * and can immediately send the ABORT message, or we'll have some
1647 * other phase and will have to source/sink data.
1649 * We really don't care what value was on the bus or what value
1650 * the target sees, so we just handshake.
1653 rc
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, 10 * HZ
);
1657 tmp
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
1659 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1661 if (tmp
!= PHASE_MSGOUT
) {
1662 NCR5380_write(INITIATOR_COMMAND_REG
,
1663 ICR_BASE
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1664 rc
= NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, 0, 3 * HZ
);
1667 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1673 phase
= PHASE_MSGOUT
;
1674 NCR5380_transfer_pio(instance
, &phase
, &len
, &msgptr
);
1677 * If we got here, and the command completed successfully,
1678 * we're about to go into bus free state.
1681 return len
? -1 : 0;
1684 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1688 #if defined(REAL_DMA)
1690 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1691 * unsigned char *phase, int *count, unsigned char **data)
1693 * Purpose : transfers data in given phase using either real
1696 * Inputs : instance - instance of driver, *phase - pointer to
1697 * what phase is expected, *count - pointer to number of
1698 * bytes to transfer, **data - pointer to data pointer.
1700 * Returns : -1 when different phase is entered without transferring
1701 * maximum number of bytes, 0 if all bytes or transferred or exit
1704 * Also, *phase, *count, *data are modified in place.
1709 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1710 unsigned char *phase
, int *count
,
1711 unsigned char **data
)
1713 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1714 register int c
= *count
;
1715 register unsigned char p
= *phase
;
1717 #if defined(CONFIG_SUN3)
1719 if (!sun3_dma_setup_done
) {
1720 pr_err("scsi%d: transfer_dma without setup!\n",
1724 hostdata
->dma_len
= c
;
1726 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1727 instance
->host_no
, (p
& SR_IO
) ? "reading" : "writing",
1728 c
, (p
& SR_IO
) ? "to" : "from", *data
);
1730 /* netbsd turns off ints here, why not be safe and do it too */
1732 /* send start chain */
1733 sun3scsi_dma_start(c
, *data
);
1735 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1736 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_MONITOR_BSY
|
1737 MR_ENABLE_EOP_INTR
);
1739 NCR5380_write(INITIATOR_COMMAND_REG
, 0);
1740 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1742 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_DATA
);
1743 NCR5380_write(START_DMA_SEND_REG
, 0);
1746 #ifdef SUN3_SCSI_VME
1747 dregs
->csr
|= CSR_DMA_ENABLE
;
1750 sun3_dma_active
= 1;
1752 #else /* !defined(CONFIG_SUN3) */
1753 register unsigned char *d
= *data
;
1756 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1761 if (hostdata
->read_overruns
&& (p
& SR_IO
))
1762 c
-= hostdata
->read_overruns
;
1764 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1765 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1766 c
, (p
& SR_IO
) ? "to" : "from", d
);
1768 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1769 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_MONITOR_BSY
|
1770 MR_ENABLE_EOP_INTR
);
1772 if (!(hostdata
->flags
& FLAG_LATE_DMA_SETUP
)) {
1773 /* On the Medusa, it is a must to initialize the DMA before
1774 * starting the NCR. This is also the cleaner way for the TT.
1776 hostdata
->dma_len
= (p
& SR_IO
) ?
1777 NCR5380_dma_read_setup(instance
, d
, c
) :
1778 NCR5380_dma_write_setup(instance
, d
, c
);
1782 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1784 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1785 NCR5380_write(START_DMA_SEND_REG
, 0);
1788 if (hostdata
->flags
& FLAG_LATE_DMA_SETUP
) {
1789 /* On the Falcon, the DMA setup must be done after the last */
1790 /* NCR access, else the DMA setup gets trashed!
1792 hostdata
->dma_len
= (p
& SR_IO
) ?
1793 NCR5380_dma_read_setup(instance
, d
, c
) :
1794 NCR5380_dma_write_setup(instance
, d
, c
);
1796 #endif /* !defined(CONFIG_SUN3) */
1800 #endif /* defined(REAL_DMA) */
1803 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1805 * Purpose : run through the various SCSI phases and do as the target
1806 * directs us to. Operates on the currently connected command,
1807 * instance->connected.
1809 * Inputs : instance, instance for which we are doing commands
1811 * Side effects : SCSI things happen, the disconnected queue will be
1812 * modified if a command disconnects, *instance->connected will
1815 * XXX Note : we need to watch for bus free or a reset condition here
1816 * to recover from an unexpected bus free condition.
1819 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
1821 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1822 unsigned char msgout
= NOP
;
1825 #if defined(REAL_DMA)
1828 unsigned char *data
;
1829 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
1830 struct scsi_cmnd
*cmd
;
1832 #ifdef SUN3_SCSI_VME
1833 dregs
->csr
|= CSR_INTR
;
1836 while ((cmd
= hostdata
->connected
)) {
1837 tmp
= NCR5380_read(STATUS_REG
);
1838 /* We only have a valid SCSI phase when REQ is asserted */
1840 phase
= (tmp
& PHASE_MASK
);
1841 if (phase
!= old_phase
) {
1843 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
1845 #if defined(CONFIG_SUN3)
1846 if (phase
== PHASE_CMDOUT
) {
1847 #if defined(REAL_DMA)
1849 unsigned long count
;
1851 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
1852 count
= cmd
->SCp
.buffer
->length
;
1853 d
= sg_virt(cmd
->SCp
.buffer
);
1855 count
= cmd
->SCp
.this_residual
;
1858 /* this command setup for dma yet? */
1859 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= cmd
)) {
1860 if (cmd
->request
->cmd_type
== REQ_TYPE_FS
) {
1861 sun3scsi_dma_setup(d
, count
,
1862 rq_data_dir(cmd
->request
));
1863 sun3_dma_setup_done
= cmd
;
1867 #ifdef SUN3_SCSI_VME
1868 dregs
->csr
|= CSR_INTR
;
1871 #endif /* CONFIG_SUN3 */
1873 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
1874 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1876 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1878 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1880 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1888 #if (NDEBUG & NDEBUG_NO_DATAOUT)
1889 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
1890 "aborted\n", HOSTNO
);
1893 cmd
->result
= DID_ERROR
<< 16;
1894 cmd
->scsi_done(cmd
);
1899 * If there is no room left in the current buffer in the
1900 * scatter-gather list, move onto the next one.
1903 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
1905 --cmd
->SCp
.buffers_residual
;
1906 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
1907 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
1908 /* ++roman: Try to merge some scatter-buffers if
1909 * they are at contiguous physical addresses.
1911 merge_contiguous_buffers(cmd
);
1912 dprintk(NDEBUG_INFORMATION
, "scsi%d: %d bytes and %d buffers left\n",
1913 HOSTNO
, cmd
->SCp
.this_residual
,
1914 cmd
->SCp
.buffers_residual
);
1918 * The preferred transfer method is going to be
1919 * PSEUDO-DMA for systems that are strictly PIO,
1920 * since we can let the hardware do the handshaking.
1922 * For this to work, we need to know the transfersize
1923 * ahead of time, since the pseudo-DMA code will sit
1924 * in an unconditional loop.
1927 /* ++roman: I suggest, this should be
1929 * instead of leaving REAL_DMA out.
1932 #if defined(REAL_DMA)
1933 #if !defined(CONFIG_SUN3)
1935 if (!cmd
->device
->borken
)
1937 transfersize
= NCR5380_dma_xfer_len(instance
, cmd
, phase
);
1939 if (transfersize
>= DMA_MIN_SIZE
) {
1941 cmd
->SCp
.phase
= phase
;
1942 if (NCR5380_transfer_dma(instance
, &phase
,
1943 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
1945 * If the watchdog timer fires, all future
1946 * accesses to this device will use the
1948 scmd_printk(KERN_INFO
, cmd
,
1949 "switching to slow handshake\n");
1950 cmd
->device
->borken
= 1;
1953 cmd
->result
= DID_ERROR
<< 16;
1954 cmd
->scsi_done(cmd
);
1955 /* XXX - need to source or sink data here, as appropriate */
1958 /* ++roman: When using real DMA,
1959 * information_transfer() should return after
1960 * starting DMA since it has nothing more to
1965 cmd
->SCp
.this_residual
-= transfersize
- len
;
1969 #endif /* defined(REAL_DMA) */
1971 spin_unlock_irq(&hostdata
->lock
);
1972 NCR5380_transfer_pio(instance
, &phase
,
1973 (int *)&cmd
->SCp
.this_residual
,
1974 (unsigned char **)&cmd
->SCp
.ptr
);
1975 spin_lock_irq(&hostdata
->lock
);
1977 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
1978 /* if we had intended to dma that command clear it */
1979 if (sun3_dma_setup_done
== cmd
)
1980 sun3_dma_setup_done
= NULL
;
1986 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1987 cmd
->SCp
.Message
= tmp
;
1991 case COMMAND_COMPLETE
:
1992 /* Accept message by clearing ACK */
1993 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1994 dsprintk(NDEBUG_QUEUES
, instance
,
1995 "COMMAND COMPLETE %p target %d lun %llu\n",
1996 cmd
, scmd_id(cmd
), cmd
->device
->lun
);
1998 hostdata
->connected
= NULL
;
2001 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2002 struct tag_alloc
*ta
= &hostdata
->TagAlloc
[scmd_id(cmd
)][cmd
->device
->lun
];
2003 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu returned "
2004 "QUEUE_FULL after %d commands\n",
2005 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2007 if (ta
->queue_size
> ta
->nr_allocated
)
2008 ta
->queue_size
= ta
->nr_allocated
;
2011 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2015 * I'm not sure what the correct thing to do here is :
2017 * If the command that just executed is NOT a request
2018 * sense, the obvious thing to do is to set the result
2019 * code to the values of the stored parameters.
2021 * If it was a REQUEST SENSE command, we need some way to
2022 * differentiate between the failure code of the original
2023 * and the failure code of the REQUEST sense - the obvious
2024 * case is success, where we fall through and leave the
2025 * result code unchanged.
2027 * The non-obvious place is where the REQUEST SENSE failed
2030 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2031 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2032 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2033 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2035 if ((cmd
->cmnd
[0] == REQUEST_SENSE
) &&
2036 hostdata
->ses
.cmd_len
) {
2037 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
2038 hostdata
->ses
.cmd_len
= 0 ;
2041 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2042 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2043 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
2045 SET_NEXT(cmd
, hostdata
->issue_queue
);
2046 hostdata
->issue_queue
= (struct scsi_cmnd
*) cmd
;
2047 dsprintk(NDEBUG_AUTOSENSE
| NDEBUG_QUEUES
,
2048 instance
, "REQUEST SENSE cmd %p added to head of issue queue\n",
2051 cmd
->scsi_done(cmd
);
2055 * Restore phase bits to 0 so an interrupted selection,
2056 * arbitration can resume.
2058 NCR5380_write(TARGET_COMMAND_REG
, 0);
2060 /* Enable reselect interrupts */
2061 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2063 /* ++roman: For Falcon SCSI, release the lock on the
2064 * ST-DMA here if no other commands are waiting on the
2065 * disconnected queue.
2067 maybe_release_dma_irq(instance
);
2069 case MESSAGE_REJECT
:
2070 /* Accept message by clearing ACK */
2071 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2072 switch (hostdata
->last_message
) {
2073 case HEAD_OF_QUEUE_TAG
:
2074 case ORDERED_QUEUE_TAG
:
2075 case SIMPLE_QUEUE_TAG
:
2076 /* The target obviously doesn't support tagged
2077 * queuing, even though it announced this ability in
2078 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2079 * clear 'tagged_supported' and lock the LUN, since
2080 * the command is treated as untagged further on.
2082 cmd
->device
->tagged_supported
= 0;
2083 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2084 cmd
->tag
= TAG_NONE
;
2085 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu rejected "
2086 "QUEUE_TAG message; tagged queuing "
2088 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2093 /* Accept message by clearing ACK */
2094 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2095 SET_NEXT(cmd
, hostdata
->disconnected_queue
);
2096 hostdata
->connected
= NULL
;
2097 hostdata
->disconnected_queue
= cmd
;
2098 dsprintk(NDEBUG_INFORMATION
| NDEBUG_QUEUES
,
2099 instance
, "connected command %p for target %d lun %llu moved to disconnected queue\n",
2100 cmd
, scmd_id(cmd
), cmd
->device
->lun
);
2103 * Restore phase bits to 0 so an interrupted selection,
2104 * arbitration can resume.
2106 NCR5380_write(TARGET_COMMAND_REG
, 0);
2108 /* Enable reselect interrupts */
2109 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2110 #ifdef SUN3_SCSI_VME
2111 dregs
->csr
|= CSR_DMA_ENABLE
;
2115 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2116 * operation, in violation of the SCSI spec so we can safely
2117 * ignore SAVE/RESTORE pointers calls.
2119 * Unfortunately, some disks violate the SCSI spec and
2120 * don't issue the required SAVE_POINTERS message before
2121 * disconnecting, and we have to break spec to remain
2125 case RESTORE_POINTERS
:
2126 /* Accept message by clearing ACK */
2127 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2129 case EXTENDED_MESSAGE
:
2131 * Extended messages are sent in the following format :
2133 * 0 EXTENDED_MESSAGE == 1
2134 * 1 length (includes one byte for code, doesn't
2135 * include first two bytes)
2137 * 3..length+1 arguments
2139 * Start the extended message buffer with the EXTENDED_MESSAGE
2140 * byte, since spi_print_msg() wants the whole thing.
2142 extended_msg
[0] = EXTENDED_MESSAGE
;
2143 /* Accept first byte by clearing ACK */
2144 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2146 spin_unlock_irq(&hostdata
->lock
);
2148 dprintk(NDEBUG_EXTENDED
, "scsi%d: receiving extended message\n", HOSTNO
);
2151 data
= extended_msg
+ 1;
2152 phase
= PHASE_MSGIN
;
2153 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2154 dprintk(NDEBUG_EXTENDED
, "scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2155 (int)extended_msg
[1], (int)extended_msg
[2]);
2157 if (!len
&& extended_msg
[1] > 0 &&
2158 extended_msg
[1] <= sizeof(extended_msg
) - 2) {
2159 /* Accept third byte by clearing ACK */
2160 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2161 len
= extended_msg
[1] - 1;
2162 data
= extended_msg
+ 3;
2163 phase
= PHASE_MSGIN
;
2165 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2166 dprintk(NDEBUG_EXTENDED
, "scsi%d: message received, residual %d\n",
2169 switch (extended_msg
[2]) {
2172 case EXTENDED_MODIFY_DATA_POINTER
:
2173 case EXTENDED_EXTENDED_IDENTIFY
:
2177 printk(KERN_NOTICE
"scsi%d: error receiving "
2178 "extended message\n", HOSTNO
);
2181 printk(KERN_NOTICE
"scsi%d: extended message "
2182 "code %02x length %d is too long\n",
2183 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2187 spin_lock_irq(&hostdata
->lock
);
2188 if (!hostdata
->connected
)
2191 /* Fall through to reject message */
2194 * If we get something weird that we aren't expecting,
2199 printk(KERN_INFO
"scsi%d: rejecting message ",
2201 spi_print_msg(extended_msg
);
2203 } else if (tmp
!= EXTENDED_MESSAGE
)
2204 scmd_printk(KERN_INFO
, cmd
,
2205 "rejecting unknown message %02x\n",
2208 scmd_printk(KERN_INFO
, cmd
,
2209 "rejecting unknown extended message code %02x, length %d\n",
2210 extended_msg
[1], extended_msg
[0]);
2212 msgout
= MESSAGE_REJECT
;
2213 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2215 } /* switch (tmp) */
2220 hostdata
->last_message
= msgout
;
2221 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2222 if (msgout
== ABORT
) {
2226 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2228 hostdata
->connected
= NULL
;
2229 cmd
->result
= DID_ERROR
<< 16;
2230 maybe_release_dma_irq(instance
);
2231 cmd
->scsi_done(cmd
);
2232 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2241 * XXX for performance reasons, on machines with a
2242 * PSEUDO-DMA architecture we should probably
2243 * use the dma transfer function.
2245 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2250 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2251 cmd
->SCp
.Status
= tmp
;
2254 printk("scsi%d: unknown phase\n", HOSTNO
);
2255 NCR5380_dprint(NDEBUG_ANY
, instance
);
2256 } /* switch(phase) */
2258 spin_unlock_irq(&hostdata
->lock
);
2259 NCR5380_poll_politely(instance
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
2260 spin_lock_irq(&hostdata
->lock
);
2266 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2268 * Purpose : does reselection, initializing the instance->connected
2269 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2270 * nexus has been reestablished,
2272 * Inputs : instance - this instance of the NCR5380.
2277 /* it might eventually prove necessary to do a dma setup on
2278 reselection, but it doesn't seem to be needed now -- sam */
2280 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2282 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2283 unsigned char target_mask
;
2288 unsigned char msg
[3];
2289 int __maybe_unused len
;
2290 unsigned char __maybe_unused
*data
, __maybe_unused phase
;
2291 struct scsi_cmnd
*tmp
= NULL
, *prev
;
2294 * Disable arbitration, etc. since the host adapter obviously
2295 * lost, and tell an interrupted NCR5380_select() to restart.
2298 NCR5380_write(MODE_REG
, MR_BASE
);
2300 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2302 dprintk(NDEBUG_RESELECTION
, "scsi%d: reselect\n", HOSTNO
);
2305 * At this point, we have detected that our SCSI ID is on the bus,
2306 * SEL is true and BSY was false for at least one bus settle delay
2309 * We must assert BSY ourselves, until the target drops the SEL
2313 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2314 if (NCR5380_poll_politely(instance
,
2315 STATUS_REG
, SR_SEL
, 0, 2 * HZ
) < 0) {
2316 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2319 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2322 * Wait for target to go into MSGIN.
2325 if (NCR5380_poll_politely(instance
,
2326 STATUS_REG
, SR_REQ
, SR_REQ
, 2 * HZ
) < 0) {
2331 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2332 /* acknowledge toggle to MSGIN */
2333 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(PHASE_MSGIN
));
2335 /* peek at the byte without really hitting the bus */
2336 msg
[0] = NCR5380_read(CURRENT_SCSI_DATA_REG
);
2340 phase
= PHASE_MSGIN
;
2341 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2349 if (!(msg
[0] & 0x80)) {
2350 shost_printk(KERN_ERR
, instance
, "expecting IDENTIFY message, got ");
2356 lun
= msg
[0] & 0x07;
2358 #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3)
2359 /* If the phase is still MSGIN, the target wants to send some more
2360 * messages. In case it supports tagged queuing, this is probably a
2361 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2364 if (phase
== PHASE_MSGIN
&& (hostdata
->flags
& FLAG_TAGGED_QUEUING
)) {
2365 /* Accept previous IDENTIFY message by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2369 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2370 msg
[1] == SIMPLE_QUEUE_TAG
)
2372 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at "
2373 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2378 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2379 * just reestablished, and remove it from the disconnected queue.
2382 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2383 tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
2384 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== (u8
)tmp
->device
->lun
)
2386 && (tag
== tmp
->tag
)
2390 SET_NEXT(prev
, NEXT(tmp
));
2392 hostdata
->disconnected_queue
= NEXT(tmp
);
2394 SET_NEXT(tmp
, NULL
);
2400 dsprintk(NDEBUG_RESELECTION
| NDEBUG_QUEUES
, instance
,
2401 "reselect: removed %p from disconnected queue\n", tmp
);
2405 shost_printk(KERN_ERR
, instance
, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n",
2406 target_mask
, lun
, tag
);
2408 shost_printk(KERN_ERR
, instance
, "target bitmask 0x%02x lun %d not in disconnected queue.\n",
2412 * Since we have an established nexus that we can't do anything
2413 * with, we must abort it.
2419 #if defined(CONFIG_SUN3) && defined(REAL_DMA)
2420 /* engage dma setup for the command we just saw */
2423 unsigned long count
;
2425 if (!tmp
->SCp
.this_residual
&& tmp
->SCp
.buffers_residual
) {
2426 count
= tmp
->SCp
.buffer
->length
;
2427 d
= sg_virt(tmp
->SCp
.buffer
);
2429 count
= tmp
->SCp
.this_residual
;
2432 /* setup this command for dma if not already */
2433 if ((count
>= DMA_MIN_SIZE
) && (sun3_dma_setup_done
!= tmp
)) {
2434 sun3scsi_dma_setup(d
, count
, rq_data_dir(tmp
->request
));
2435 sun3_dma_setup_done
= tmp
;
2439 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2442 /* Accept message by clearing ACK */
2443 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2445 #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3)
2446 /* If the phase is still MSGIN, the target wants to send some more
2447 * messages. In case it supports tagged queuing, this is probably a
2448 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2451 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2452 /* Accept previous IDENTIFY message by clearing ACK */
2453 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2456 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2457 msg
[1] == SIMPLE_QUEUE_TAG
)
2459 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n"
2460 HOSTNO
, target_mask
, lun
, tag
);
2464 hostdata
->connected
= tmp
;
2465 dprintk(NDEBUG_RESELECTION
, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2466 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
, tmp
->tag
);
2471 * Function : int NCR5380_abort (struct scsi_cmnd *cmd)
2473 * Purpose : abort a command
2475 * Inputs : cmd - the scsi_cmnd to abort, code - code to set the
2476 * host byte of the result field to, if zero DID_ABORTED is
2479 * Returns : SUCCESS - success, FAILED on failure.
2481 * XXX - there is no way to abort the command that is currently
2482 * connected, you have to wait for it to complete. If this is
2483 * a problem, we could implement longjmp() / setjmp(), setjmp()
2484 * called where the loop started in NCR5380_main().
2488 int NCR5380_abort(struct scsi_cmnd
*cmd
)
2490 struct Scsi_Host
*instance
= cmd
->device
->host
;
2491 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2492 struct scsi_cmnd
*tmp
, **prev
;
2493 unsigned long flags
;
2495 scmd_printk(KERN_NOTICE
, cmd
, "aborting command\n");
2497 spin_lock_irqsave(&hostdata
->lock
, flags
);
2499 NCR5380_dprint(NDEBUG_ANY
, instance
);
2500 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
2502 dprintk(NDEBUG_ABORT
, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2503 NCR5380_read(BUS_AND_STATUS_REG
),
2504 NCR5380_read(STATUS_REG
));
2508 * Case 1 : If the command is the currently executing command,
2509 * we'll set the aborted flag and return control so that
2510 * information transfer routine can exit cleanly.
2513 if (hostdata
->connected
== cmd
) {
2515 dprintk(NDEBUG_ABORT
, "scsi%d: aborting connected command\n", HOSTNO
);
2517 * We should perform BSY checking, and make sure we haven't slipped
2521 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2523 * Since we can't change phases until we've completed the current
2524 * handshake, we have to source or sink a byte of data if the current
2525 * phase is not MSGOUT.
2529 * Return control to the executing NCR drive so we can clear the
2530 * aborted flag and get back into our main loop.
2533 if (do_abort(instance
) == 0) {
2534 hostdata
->connected
= NULL
;
2535 cmd
->result
= DID_ABORT
<< 16;
2539 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2541 maybe_release_dma_irq(instance
);
2542 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2543 cmd
->scsi_done(cmd
);
2546 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2547 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2554 * Case 2 : If the command hasn't been issued yet, we simply remove it
2555 * from the issue queue.
2557 for (prev
= (struct scsi_cmnd
**)&(hostdata
->issue_queue
),
2558 tmp
= (struct scsi_cmnd
*)hostdata
->issue_queue
;
2559 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2561 (*prev
) = NEXT(tmp
);
2562 SET_NEXT(tmp
, NULL
);
2563 tmp
->result
= DID_ABORT
<< 16;
2564 maybe_release_dma_irq(instance
);
2565 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2566 dprintk(NDEBUG_ABORT
, "scsi%d: abort removed command from issue queue.\n",
2568 /* Tagged queuing note: no tag to free here, hasn't been assigned
2570 tmp
->scsi_done(tmp
);
2576 * Case 3 : If any commands are connected, we're going to fail the abort
2577 * and let the high level SCSI driver retry at a later time or
2580 * Timeouts, and therefore aborted commands, will be highly unlikely
2581 * and handling them cleanly in this situation would make the common
2582 * case of noresets less efficient, and would pollute our code. So,
2586 if (hostdata
->connected
) {
2587 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2588 dprintk(NDEBUG_ABORT
, "scsi%d: abort failed, command connected.\n", HOSTNO
);
2593 * Case 4: If the command is currently disconnected from the bus, and
2594 * there are no connected commands, we reconnect the I_T_L or
2595 * I_T_L_Q nexus associated with it, go into message out, and send
2598 * This case is especially ugly. In order to reestablish the nexus, we
2599 * need to call NCR5380_select(). The easiest way to implement this
2600 * function was to abort if the bus was busy, and let the interrupt
2601 * handler triggered on the SEL for reselect take care of lost arbitrations
2602 * where necessary, meaning interrupts need to be enabled.
2604 * When interrupts are enabled, the queues may change - so we
2605 * can't remove it from the disconnected queue before selecting it
2606 * because that could cause a failure in hashing the nexus if that
2607 * device reselected.
2609 * Since the queues may change, we can't use the pointers from when we
2612 * So, we must first locate the command, and if NCR5380_select()
2613 * succeeds, then issue the abort, relocate the command and remove
2614 * it from the disconnected queue.
2617 for (tmp
= (struct scsi_cmnd
*) hostdata
->disconnected_queue
; tmp
;
2620 dprintk(NDEBUG_ABORT
, "scsi%d: aborting disconnected command.\n", HOSTNO
);
2622 if (NCR5380_select(instance
, cmd
)) {
2623 spin_unlock_irq(&hostdata
->lock
);
2626 dprintk(NDEBUG_ABORT
, "scsi%d: nexus reestablished.\n", HOSTNO
);
2630 for (prev
= (struct scsi_cmnd
**)&(hostdata
->disconnected_queue
),
2631 tmp
= (struct scsi_cmnd
*)hostdata
->disconnected_queue
;
2632 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2635 SET_NEXT(tmp
, NULL
);
2636 tmp
->result
= DID_ABORT
<< 16;
2637 /* We must unlock the tag/LUN immediately here, since the
2638 * target goes to BUS FREE and doesn't send us another
2639 * message (COMMAND_COMPLETE or the like)
2644 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2646 maybe_release_dma_irq(instance
);
2647 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2648 tmp
->scsi_done(tmp
);
2655 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2656 * possible at all) At least, we should check if the lock could be
2657 * released after the abort, in case it is kept due to some bug.
2659 maybe_release_dma_irq(instance
);
2660 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2663 * Case 5 : If we reached this point, the command was not found in any of
2666 * We probably reached this point because of an unlikely race condition
2667 * between the command completing successfully and the abortion code,
2668 * so we won't panic, but we will notify the user in case something really
2672 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO
);
2679 * NCR5380_bus_reset - reset the SCSI bus
2680 * @cmd: SCSI command undergoing EH
2685 static int NCR5380_bus_reset(struct scsi_cmnd
*cmd
)
2687 struct Scsi_Host
*instance
= cmd
->device
->host
;
2688 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2690 unsigned long flags
;
2692 spin_lock_irqsave(&hostdata
->lock
, flags
);
2694 #if (NDEBUG & NDEBUG_ANY)
2695 scmd_printk(KERN_INFO
, cmd
, "performing bus reset\n");
2697 NCR5380_dprint(NDEBUG_ANY
, instance
);
2698 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
2702 /* reset NCR registers */
2703 NCR5380_write(MODE_REG
, MR_BASE
);
2704 NCR5380_write(TARGET_COMMAND_REG
, 0);
2705 NCR5380_write(SELECT_ENABLE_REG
, 0);
2707 /* After the reset, there are no more connected or disconnected commands
2708 * and no busy units; so clear the low-level status here to avoid
2709 * conflicts when the mid-level code tries to wake up the affected
2713 if (hostdata
->issue_queue
)
2714 dsprintk(NDEBUG_ABORT
, instance
, "reset aborted issued command(s)\n");
2715 if (hostdata
->connected
)
2716 dsprintk(NDEBUG_ABORT
, instance
, "reset aborted a connected command\n");
2717 if (hostdata
->disconnected_queue
)
2718 dsprintk(NDEBUG_ABORT
, instance
, "reset aborted disconnected command(s)\n");
2720 hostdata
->issue_queue
= NULL
;
2721 hostdata
->connected
= NULL
;
2722 hostdata
->disconnected_queue
= NULL
;
2724 free_all_tags(hostdata
);
2726 for (i
= 0; i
< 8; ++i
)
2727 hostdata
->busy
[i
] = 0;
2729 hostdata
->dma_len
= 0;
2732 maybe_release_dma_irq(instance
);
2733 spin_unlock_irqrestore(&hostdata
->lock
, flags
);