1 // SPDX-License-Identifier: GPL-2.0
3 * NCR 5380 generic driver routines. These should make it *trivial*
4 * to implement 5380 SCSI drivers under Linux with a non-trantor
7 * Note that these routines also work with NR53c400 family chips.
9 * Copyright 1993, Drew Eckhardt
11 * (Unix and Linux consulting and custom programming)
15 * For more information, please consult
18 * SCSI Protocol Controller
21 * NCR Microelectronics
22 * 1635 Aeroplaza Drive
23 * Colorado Springs, CO 80916
29 * With contributions from Ray Van Tassle, Ingmar Baumgart,
30 * Ronald van Cuijlenborg, Alan Cox and others.
33 /* Ported to Atari by Roman Hodek and others. */
35 /* Adapted for the Sun 3 by Sam Creasey. */
40 * This is a generic 5380 driver. To use it on a different platform,
41 * one simply writes appropriate system specific macros (ie, data
42 * transfer - some PC's will use the I/O bus, 68K's must use
43 * memory mapped) and drops this file in their 'C' wrapper.
45 * As far as command queueing, two queues are maintained for
46 * each 5380 in the system - commands that haven't been issued yet,
47 * and commands that are currently executing. This means that an
48 * unlimited number of commands may be queued, letting
49 * more commands propagate from the higher driver levels giving higher
50 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
51 * allowing multiple commands to propagate all the way to a SCSI-II device
52 * while a command is already executing.
55 * Issues specific to the NCR5380 :
57 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
58 * piece of hardware that requires you to sit in a loop polling for
59 * the REQ signal as long as you are connected. Some devices are
60 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
61 * while doing long seek operations. [...] These
62 * broken devices are the exception rather than the rule and I'd rather
63 * spend my time optimizing for the normal case.
67 * At the heart of the design is a coroutine, NCR5380_main,
68 * which is started from a workqueue for each NCR5380 host in the
69 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
70 * removing the commands from the issue queue and calling
71 * NCR5380_select() if a nexus is not established.
73 * Once a nexus is established, the NCR5380_information_transfer()
74 * phase goes through the various phases as instructed by the target.
75 * if the target goes into MSG IN and sends a DISCONNECT message,
76 * the command structure is placed into the per instance disconnected
77 * queue, and NCR5380_main tries to find more work. If the target is
78 * idle for too long, the system will try to sleep.
80 * If a command has disconnected, eventually an interrupt will trigger,
81 * calling NCR5380_intr() which will in turn call NCR5380_reselect
82 * to reestablish a nexus. This will run main if necessary.
84 * On command termination, the done function will be called as
87 * SCSI pointers are maintained in the SCp field of SCSI command
88 * structures, being initialized after the command is connected
89 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
90 * Note that in violation of the standard, an implicit SAVE POINTERS operation
91 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
96 * This file a skeleton Linux SCSI driver for the NCR 5380 series
97 * of chips. To use it, you write an architecture specific functions
98 * and macros and include this file in your driver.
100 * These macros MUST be defined :
102 * NCR5380_read(register) - read from the specified register
104 * NCR5380_write(register, value) - write to the specific register
106 * NCR5380_implementation_fields - additional fields needed for this
107 * specific implementation of the NCR5380
109 * Either real DMA *or* pseudo DMA may be implemented
111 * NCR5380_dma_xfer_len - determine size of DMA/PDMA transfer
112 * NCR5380_dma_send_setup - execute DMA/PDMA from memory to 5380
113 * NCR5380_dma_recv_setup - execute DMA/PDMA from 5380 to memory
114 * NCR5380_dma_residual - residual byte count
116 * The generic driver is initialized by calling NCR5380_init(instance),
117 * after setting the appropriate host specific fields and ID.
120 #ifndef NCR5380_io_delay
121 #define NCR5380_io_delay(x)
124 #ifndef NCR5380_acquire_dma_irq
125 #define NCR5380_acquire_dma_irq(x) (1)
128 #ifndef NCR5380_release_dma_irq
129 #define NCR5380_release_dma_irq(x)
132 static unsigned int disconnect_mask
= ~0;
133 module_param(disconnect_mask
, int, 0444);
135 static int do_abort(struct Scsi_Host
*, unsigned int);
136 static void do_reset(struct Scsi_Host
*);
137 static void bus_reset_cleanup(struct Scsi_Host
*);
140 * initialize_SCp - init the scsi pointer field
141 * @cmd: command block to set up
143 * Set up the internal fields in the SCSI command.
146 static inline void initialize_SCp(struct scsi_cmnd
*cmd
)
149 * Initialize the Scsi Pointer field so that all of the commands in the
150 * various queues are valid.
153 if (scsi_bufflen(cmd
)) {
154 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
155 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
156 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
158 cmd
->SCp
.buffer
= NULL
;
160 cmd
->SCp
.this_residual
= 0;
164 cmd
->SCp
.Message
= 0;
167 static inline void advance_sg_buffer(struct scsi_cmnd
*cmd
)
169 struct scatterlist
*s
= cmd
->SCp
.buffer
;
171 if (!cmd
->SCp
.this_residual
&& s
&& !sg_is_last(s
)) {
172 cmd
->SCp
.buffer
= sg_next(s
);
173 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
174 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
178 static inline void set_resid_from_SCp(struct scsi_cmnd
*cmd
)
180 int resid
= cmd
->SCp
.this_residual
;
181 struct scatterlist
*s
= cmd
->SCp
.buffer
;
184 while (!sg_is_last(s
)) {
188 scsi_set_resid(cmd
, resid
);
192 * NCR5380_poll_politely2 - wait for two chip register values
193 * @hostdata: host private data
194 * @reg1: 5380 register to poll
195 * @bit1: Bitmask to check
196 * @val1: Expected value
197 * @reg2: Second 5380 register to poll
198 * @bit2: Second bitmask to check
199 * @val2: Second expected value
200 * @wait: Time-out in jiffies, 0 if sleeping is not allowed
202 * Polls the chip in a reasonably efficient manner waiting for an
203 * event to occur. After a short quick poll we begin to yield the CPU
204 * (if possible). In irq contexts the time-out is arbitrarily limited.
205 * Callers may hold locks as long as they are held in irq mode.
207 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT.
210 static int NCR5380_poll_politely2(struct NCR5380_hostdata
*hostdata
,
211 unsigned int reg1
, u8 bit1
, u8 val1
,
212 unsigned int reg2
, u8 bit2
, u8 val2
,
215 unsigned long n
= hostdata
->poll_loops
;
216 unsigned long deadline
= jiffies
+ wait
;
219 if ((NCR5380_read(reg1
) & bit1
) == val1
)
221 if ((NCR5380_read(reg2
) & bit2
) == val2
)
229 /* Repeatedly sleep for 1 ms until deadline */
230 while (time_is_after_jiffies(deadline
)) {
231 schedule_timeout_uninterruptible(1);
232 if ((NCR5380_read(reg1
) & bit1
) == val1
)
234 if ((NCR5380_read(reg2
) & bit2
) == val2
)
257 {BASR_END_DMA_TRANSFER
, "END OF DMA"},
259 {BASR_PARITY_ERROR
, "PARITY ERROR"},
261 {BASR_PHASE_MATCH
, "PHASE MATCH"},
262 {BASR_BUSY_ERROR
, "BUSY ERROR"},
268 {ICR_ASSERT_RST
, "ASSERT RST"},
269 {ICR_ARBITRATION_PROGRESS
, "ARB. IN PROGRESS"},
270 {ICR_ARBITRATION_LOST
, "LOST ARB."},
271 {ICR_ASSERT_ACK
, "ASSERT ACK"},
272 {ICR_ASSERT_BSY
, "ASSERT BSY"},
273 {ICR_ASSERT_SEL
, "ASSERT SEL"},
274 {ICR_ASSERT_ATN
, "ASSERT ATN"},
275 {ICR_ASSERT_DATA
, "ASSERT DATA"},
279 {MR_BLOCK_DMA_MODE
, "BLOCK DMA MODE"},
280 {MR_TARGET
, "TARGET"},
281 {MR_ENABLE_PAR_CHECK
, "PARITY CHECK"},
282 {MR_ENABLE_PAR_INTR
, "PARITY INTR"},
283 {MR_ENABLE_EOP_INTR
, "EOP INTR"},
284 {MR_MONITOR_BSY
, "MONITOR BSY"},
285 {MR_DMA_MODE
, "DMA MODE"},
286 {MR_ARBITRATE
, "ARBITRATE"},
291 * NCR5380_print - print scsi bus signals
292 * @instance: adapter state to dump
294 * Print the SCSI bus signals for debugging purposes
297 static void NCR5380_print(struct Scsi_Host
*instance
)
299 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
300 unsigned char status
, basr
, mr
, icr
, i
;
302 status
= NCR5380_read(STATUS_REG
);
303 mr
= NCR5380_read(MODE_REG
);
304 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
305 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
307 printk(KERN_DEBUG
"SR = 0x%02x : ", status
);
308 for (i
= 0; signals
[i
].mask
; ++i
)
309 if (status
& signals
[i
].mask
)
310 printk(KERN_CONT
"%s, ", signals
[i
].name
);
311 printk(KERN_CONT
"\nBASR = 0x%02x : ", basr
);
312 for (i
= 0; basrs
[i
].mask
; ++i
)
313 if (basr
& basrs
[i
].mask
)
314 printk(KERN_CONT
"%s, ", basrs
[i
].name
);
315 printk(KERN_CONT
"\nICR = 0x%02x : ", icr
);
316 for (i
= 0; icrs
[i
].mask
; ++i
)
317 if (icr
& icrs
[i
].mask
)
318 printk(KERN_CONT
"%s, ", icrs
[i
].name
);
319 printk(KERN_CONT
"\nMR = 0x%02x : ", mr
);
320 for (i
= 0; mrs
[i
].mask
; ++i
)
321 if (mr
& mrs
[i
].mask
)
322 printk(KERN_CONT
"%s, ", mrs
[i
].name
);
323 printk(KERN_CONT
"\n");
330 {PHASE_DATAOUT
, "DATAOUT"},
331 {PHASE_DATAIN
, "DATAIN"},
332 {PHASE_CMDOUT
, "CMDOUT"},
333 {PHASE_STATIN
, "STATIN"},
334 {PHASE_MSGOUT
, "MSGOUT"},
335 {PHASE_MSGIN
, "MSGIN"},
336 {PHASE_UNKNOWN
, "UNKNOWN"}
340 * NCR5380_print_phase - show SCSI phase
341 * @instance: adapter to dump
343 * Print the current SCSI phase for debugging purposes
346 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
348 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
349 unsigned char status
;
352 status
= NCR5380_read(STATUS_REG
);
353 if (!(status
& SR_REQ
))
354 shost_printk(KERN_DEBUG
, instance
, "REQ not asserted, phase unknown.\n");
356 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
357 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
359 shost_printk(KERN_DEBUG
, instance
, "phase %s\n", phases
[i
].name
);
365 * NCR5380_info - report driver and host information
366 * @instance: relevant scsi host instance
368 * For use as the host template info() handler.
371 static const char *NCR5380_info(struct Scsi_Host
*instance
)
373 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
375 return hostdata
->info
;
379 * NCR5380_init - initialise an NCR5380
380 * @instance: adapter to configure
381 * @flags: control flags
383 * Initializes *instance and corresponding 5380 chip,
384 * with flags OR'd into the initial flags value.
386 * Notes : I assume that the host, hostno, and id bits have been
387 * set correctly. I don't care about the irq and other fields.
389 * Returns 0 for success
392 static int NCR5380_init(struct Scsi_Host
*instance
, int flags
)
394 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
396 unsigned long deadline
;
397 unsigned long accesses_per_ms
;
399 instance
->max_lun
= 7;
401 hostdata
->host
= instance
;
402 hostdata
->id_mask
= 1 << instance
->this_id
;
403 hostdata
->id_higher_mask
= 0;
404 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
405 if (i
> hostdata
->id_mask
)
406 hostdata
->id_higher_mask
|= i
;
407 for (i
= 0; i
< 8; ++i
)
408 hostdata
->busy
[i
] = 0;
409 hostdata
->dma_len
= 0;
411 spin_lock_init(&hostdata
->lock
);
412 hostdata
->connected
= NULL
;
413 hostdata
->sensing
= NULL
;
414 INIT_LIST_HEAD(&hostdata
->autosense
);
415 INIT_LIST_HEAD(&hostdata
->unissued
);
416 INIT_LIST_HEAD(&hostdata
->disconnected
);
418 hostdata
->flags
= flags
;
420 INIT_WORK(&hostdata
->main_task
, NCR5380_main
);
421 hostdata
->work_q
= alloc_workqueue("ncr5380_%d",
422 WQ_UNBOUND
| WQ_MEM_RECLAIM
,
423 1, instance
->host_no
);
424 if (!hostdata
->work_q
)
427 snprintf(hostdata
->info
, sizeof(hostdata
->info
),
428 "%s, irq %d, io_port 0x%lx, base 0x%lx, can_queue %d, cmd_per_lun %d, sg_tablesize %d, this_id %d, flags { %s%s%s}",
429 instance
->hostt
->name
, instance
->irq
, hostdata
->io_port
,
430 hostdata
->base
, instance
->can_queue
, instance
->cmd_per_lun
,
431 instance
->sg_tablesize
, instance
->this_id
,
432 hostdata
->flags
& FLAG_DMA_FIXUP
? "DMA_FIXUP " : "",
433 hostdata
->flags
& FLAG_NO_PSEUDO_DMA
? "NO_PSEUDO_DMA " : "",
434 hostdata
->flags
& FLAG_TOSHIBA_DELAY
? "TOSHIBA_DELAY " : "");
436 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
437 NCR5380_write(MODE_REG
, MR_BASE
);
438 NCR5380_write(TARGET_COMMAND_REG
, 0);
439 NCR5380_write(SELECT_ENABLE_REG
, 0);
441 /* Calibrate register polling loop */
443 deadline
= jiffies
+ 1;
446 } while (time_is_after_jiffies(deadline
));
447 deadline
+= msecs_to_jiffies(256);
449 NCR5380_read(STATUS_REG
);
452 } while (time_is_after_jiffies(deadline
));
453 accesses_per_ms
= i
/ 256;
454 hostdata
->poll_loops
= NCR5380_REG_POLL_TIME
* accesses_per_ms
/ 2;
460 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
461 * @instance: adapter to check
463 * If the system crashed, it may have crashed with a connected target and
464 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
465 * currently established nexus, which we know nothing about. Failing that
468 * Note that a bus reset will cause the chip to assert IRQ.
470 * Returns 0 if successful, otherwise -ENXIO.
473 static int NCR5380_maybe_reset_bus(struct Scsi_Host
*instance
)
475 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
478 for (pass
= 1; (NCR5380_read(STATUS_REG
) & SR_BSY
) && pass
<= 6; ++pass
) {
483 shost_printk(KERN_ERR
, instance
, "SCSI bus busy, waiting up to five seconds\n");
484 NCR5380_poll_politely(hostdata
,
485 STATUS_REG
, SR_BSY
, 0, 5 * HZ
);
488 shost_printk(KERN_ERR
, instance
, "bus busy, attempting abort\n");
489 do_abort(instance
, 1);
492 shost_printk(KERN_ERR
, instance
, "bus busy, attempting reset\n");
494 /* Wait after a reset; the SCSI standard calls for
495 * 250ms, we wait 500ms to be on the safe side.
496 * But some Toshiba CD-ROMs need ten times that.
498 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
504 shost_printk(KERN_ERR
, instance
, "bus locked solid\n");
512 * NCR5380_exit - remove an NCR5380
513 * @instance: adapter to remove
515 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
518 static void NCR5380_exit(struct Scsi_Host
*instance
)
520 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
522 cancel_work_sync(&hostdata
->main_task
);
523 destroy_workqueue(hostdata
->work_q
);
527 * complete_cmd - finish processing a command and return it to the SCSI ML
528 * @instance: the host instance
529 * @cmd: command to complete
532 static void complete_cmd(struct Scsi_Host
*instance
,
533 struct scsi_cmnd
*cmd
)
535 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
537 dsprintk(NDEBUG_QUEUES
, instance
, "complete_cmd: cmd %p\n", cmd
);
539 if (hostdata
->sensing
== cmd
) {
540 /* Autosense processing ends here */
541 if (get_status_byte(cmd
) != SAM_STAT_GOOD
) {
542 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
544 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
545 set_status_byte(cmd
, SAM_STAT_CHECK_CONDITION
);
547 hostdata
->sensing
= NULL
;
554 * NCR5380_queue_command - queue a command
555 * @instance: the relevant SCSI adapter
558 * cmd is added to the per-instance issue queue, with minor
559 * twiddling done to the host specific fields of cmd. If the
560 * main coroutine is not running, it is restarted.
563 static int NCR5380_queue_command(struct Scsi_Host
*instance
,
564 struct scsi_cmnd
*cmd
)
566 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
567 struct NCR5380_cmd
*ncmd
= scsi_cmd_priv(cmd
);
570 #if (NDEBUG & NDEBUG_NO_WRITE)
571 switch (cmd
->cmnd
[0]) {
574 shost_printk(KERN_DEBUG
, instance
, "WRITE attempted with NDEBUG_NO_WRITE set\n");
575 cmd
->result
= (DID_ERROR
<< 16);
579 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
583 spin_lock_irqsave(&hostdata
->lock
, flags
);
585 if (!NCR5380_acquire_dma_irq(instance
)) {
586 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
588 return SCSI_MLQUEUE_HOST_BUSY
;
592 * Insert the cmd into the issue queue. Note that REQUEST SENSE
593 * commands are added to the head of the queue since any command will
594 * clear the contingent allegiance condition that exists and the
595 * sense data is only guaranteed to be valid while the condition exists.
598 if (cmd
->cmnd
[0] == REQUEST_SENSE
)
599 list_add(&ncmd
->list
, &hostdata
->unissued
);
601 list_add_tail(&ncmd
->list
, &hostdata
->unissued
);
603 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
605 dsprintk(NDEBUG_QUEUES
, instance
, "command %p added to %s of queue\n",
606 cmd
, (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
608 /* Kick off command processing */
609 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
613 static inline void maybe_release_dma_irq(struct Scsi_Host
*instance
)
615 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
617 /* Caller does the locking needed to set & test these data atomically */
618 if (list_empty(&hostdata
->disconnected
) &&
619 list_empty(&hostdata
->unissued
) &&
620 list_empty(&hostdata
->autosense
) &&
621 !hostdata
->connected
&&
622 !hostdata
->selecting
) {
623 NCR5380_release_dma_irq(instance
);
628 * dequeue_next_cmd - dequeue a command for processing
629 * @instance: the scsi host instance
631 * Priority is given to commands on the autosense queue. These commands
632 * need autosense because of a CHECK CONDITION result.
634 * Returns a command pointer if a command is found for a target that is
635 * not already busy. Otherwise returns NULL.
638 static struct scsi_cmnd
*dequeue_next_cmd(struct Scsi_Host
*instance
)
640 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
641 struct NCR5380_cmd
*ncmd
;
642 struct scsi_cmnd
*cmd
;
644 if (hostdata
->sensing
|| list_empty(&hostdata
->autosense
)) {
645 list_for_each_entry(ncmd
, &hostdata
->unissued
, list
) {
646 cmd
= NCR5380_to_scmd(ncmd
);
647 dsprintk(NDEBUG_QUEUES
, instance
, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n",
648 cmd
, scmd_id(cmd
), hostdata
->busy
[scmd_id(cmd
)], cmd
->device
->lun
);
650 if (!(hostdata
->busy
[scmd_id(cmd
)] & (1 << cmd
->device
->lun
))) {
651 list_del(&ncmd
->list
);
652 dsprintk(NDEBUG_QUEUES
, instance
,
653 "dequeue: removed %p from issue queue\n", cmd
);
658 /* Autosense processing begins here */
659 ncmd
= list_first_entry(&hostdata
->autosense
,
660 struct NCR5380_cmd
, list
);
661 list_del(&ncmd
->list
);
662 cmd
= NCR5380_to_scmd(ncmd
);
663 dsprintk(NDEBUG_QUEUES
, instance
,
664 "dequeue: removed %p from autosense queue\n", cmd
);
665 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
666 hostdata
->sensing
= cmd
;
672 static void requeue_cmd(struct Scsi_Host
*instance
, struct scsi_cmnd
*cmd
)
674 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
675 struct NCR5380_cmd
*ncmd
= scsi_cmd_priv(cmd
);
677 if (hostdata
->sensing
== cmd
) {
678 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
679 list_add(&ncmd
->list
, &hostdata
->autosense
);
680 hostdata
->sensing
= NULL
;
682 list_add(&ncmd
->list
, &hostdata
->unissued
);
686 * NCR5380_main - NCR state machines
688 * NCR5380_main is a coroutine that runs as long as more work can
689 * be done on the NCR5380 host adapters in a system. Both
690 * NCR5380_queue_command() and NCR5380_intr() will try to start it
691 * in case it is not running.
694 static void NCR5380_main(struct work_struct
*work
)
696 struct NCR5380_hostdata
*hostdata
=
697 container_of(work
, struct NCR5380_hostdata
, main_task
);
698 struct Scsi_Host
*instance
= hostdata
->host
;
704 spin_lock_irq(&hostdata
->lock
);
705 while (!hostdata
->connected
&& !hostdata
->selecting
) {
706 struct scsi_cmnd
*cmd
= dequeue_next_cmd(instance
);
711 dsprintk(NDEBUG_MAIN
, instance
, "main: dequeued %p\n", cmd
);
714 * Attempt to establish an I_T_L nexus here.
715 * On success, instance->hostdata->connected is set.
716 * On failure, we must add the command back to the
717 * issue queue so we can keep trying.
720 * REQUEST SENSE commands are issued without tagged
721 * queueing, even on SCSI-II devices because the
722 * contingent allegiance condition exists for the
726 if (!NCR5380_select(instance
, cmd
)) {
727 dsprintk(NDEBUG_MAIN
, instance
, "main: select complete\n");
729 dsprintk(NDEBUG_MAIN
| NDEBUG_QUEUES
, instance
,
730 "main: select failed, returning %p to queue\n", cmd
);
731 requeue_cmd(instance
, cmd
);
734 if (hostdata
->connected
&& !hostdata
->dma_len
) {
735 dsprintk(NDEBUG_MAIN
, instance
, "main: performing information transfer\n");
736 NCR5380_information_transfer(instance
);
739 if (!hostdata
->connected
) {
740 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
741 maybe_release_dma_irq(instance
);
743 spin_unlock_irq(&hostdata
->lock
);
750 * NCR5380_dma_complete - finish DMA transfer
751 * @instance: the scsi host instance
753 * Called by the interrupt handler when DMA finishes or a phase
754 * mismatch occurs (which would end the DMA transfer).
757 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
759 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
761 unsigned char **data
;
763 int saved_data
= 0, overrun
= 0;
766 if (hostdata
->read_overruns
) {
767 p
= hostdata
->connected
->SCp
.phase
;
770 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
771 (BASR_PHASE_MATCH
| BASR_ACK
)) ==
772 (BASR_PHASE_MATCH
| BASR_ACK
)) {
773 saved_data
= NCR5380_read(INPUT_DATA_REG
);
775 dsprintk(NDEBUG_DMA
, instance
, "read overrun handled\n");
781 if (sun3scsi_dma_finish(hostdata
->connected
->sc_data_direction
)) {
782 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
787 if ((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
| BASR_ACK
)) ==
788 (BASR_PHASE_MATCH
| BASR_ACK
)) {
789 pr_err("scsi%d: BASR %02x\n", instance
->host_no
,
790 NCR5380_read(BUS_AND_STATUS_REG
));
791 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
797 NCR5380_write(MODE_REG
, MR_BASE
);
798 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
799 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
801 transferred
= hostdata
->dma_len
- NCR5380_dma_residual(hostdata
);
802 hostdata
->dma_len
= 0;
804 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
805 count
= &hostdata
->connected
->SCp
.this_residual
;
806 *data
+= transferred
;
807 *count
-= transferred
;
809 if (hostdata
->read_overruns
) {
812 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
813 cnt
= toPIO
= hostdata
->read_overruns
;
815 dsprintk(NDEBUG_DMA
, instance
,
816 "Got an input overrun, using saved byte\n");
817 *(*data
)++ = saved_data
;
823 dsprintk(NDEBUG_DMA
, instance
,
824 "Doing %d byte PIO to 0x%p\n", cnt
, *data
);
825 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
, 0);
826 *count
-= toPIO
- cnt
;
833 * NCR5380_intr - generic NCR5380 irq handler
834 * @irq: interrupt number
835 * @dev_id: device info
837 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
838 * from the disconnected queue, and restarting NCR5380_main()
841 * The chip can assert IRQ in any of six different conditions. The IRQ flag
842 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR).
843 * Three of these six conditions are latched in the Bus and Status Register:
844 * - End of DMA (cleared by ending DMA Mode)
845 * - Parity error (cleared by reading RPIR)
846 * - Loss of BSY (cleared by reading RPIR)
847 * Two conditions have flag bits that are not latched:
848 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode)
849 * - Bus reset (non-maskable)
850 * The remaining condition has no flag bit at all:
851 * - Selection/reselection
853 * Hence, establishing the cause(s) of any interrupt is partly guesswork.
854 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor
855 * claimed that "the design of the [DP8490] interrupt logic ensures
856 * interrupts will not be lost (they can be on the DP5380)."
857 * The L5380/53C80 datasheet from LOGIC Devices has more details.
859 * Checking for bus reset by reading RST is futile because of interrupt
860 * latency, but a bus reset will reset chip logic. Checking for parity error
861 * is unnecessary because that interrupt is never enabled. A Loss of BSY
862 * condition will clear DMA Mode. We can tell when this occurs because the
863 * the Busy Monitor interrupt is enabled together with DMA Mode.
866 static irqreturn_t __maybe_unused
NCR5380_intr(int irq
, void *dev_id
)
868 struct Scsi_Host
*instance
= dev_id
;
869 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
874 spin_lock_irqsave(&hostdata
->lock
, flags
);
876 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
877 if (basr
& BASR_IRQ
) {
878 unsigned char mr
= NCR5380_read(MODE_REG
);
879 unsigned char sr
= NCR5380_read(STATUS_REG
);
881 dsprintk(NDEBUG_INTR
, instance
, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n",
884 if ((mr
& MR_DMA_MODE
) || (mr
& MR_MONITOR_BSY
)) {
885 /* Probably End of DMA, Phase Mismatch or Loss of BSY.
886 * We ack IRQ after clearing Mode Register. Workarounds
887 * for End of DMA errata need to happen in DMA Mode.
890 dsprintk(NDEBUG_INTR
, instance
, "interrupt in DMA mode\n");
892 if (hostdata
->connected
) {
893 NCR5380_dma_complete(instance
);
894 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
896 NCR5380_write(MODE_REG
, MR_BASE
);
897 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
899 } else if ((NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_mask
) &&
900 (sr
& (SR_SEL
| SR_IO
| SR_BSY
| SR_RST
)) == (SR_SEL
| SR_IO
)) {
901 /* Probably reselected */
902 NCR5380_write(SELECT_ENABLE_REG
, 0);
903 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
905 dsprintk(NDEBUG_INTR
, instance
, "interrupt with SEL and IO\n");
907 if (!hostdata
->connected
) {
908 NCR5380_reselect(instance
);
909 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
911 if (!hostdata
->connected
)
912 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
914 /* Probably Bus Reset */
915 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
918 /* Certainly Bus Reset */
919 shost_printk(KERN_WARNING
, instance
,
920 "bus reset interrupt\n");
921 bus_reset_cleanup(instance
);
923 dsprintk(NDEBUG_INTR
, instance
, "unknown interrupt\n");
926 dregs
->csr
|= CSR_DMA_ENABLE
;
931 dsprintk(NDEBUG_INTR
, instance
, "interrupt without IRQ bit\n");
933 dregs
->csr
|= CSR_DMA_ENABLE
;
937 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
939 return IRQ_RETVAL(handled
);
943 * NCR5380_select - attempt arbitration and selection for a given command
944 * @instance: the Scsi_Host instance
945 * @cmd: the scsi_cmnd to execute
947 * This routine establishes an I_T_L nexus for a SCSI command. This involves
948 * ARBITRATION, SELECTION and MESSAGE OUT phases and an IDENTIFY message.
950 * Returns true if the operation should be retried.
951 * Returns false if it should not be retried.
954 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
955 * with registers as they should have been on entry - ie
956 * SELECT_ENABLE will be set appropriately, the NCR5380
957 * will cease to drive any SCSI bus signals.
959 * If successful : the I_T_L nexus will be established, and
960 * hostdata->connected will be set to cmd.
961 * SELECT interrupt will be disabled.
963 * If failed (no target) : cmd->scsi_done() will be called, and the
964 * cmd->result host byte set to DID_BAD_TARGET.
967 static bool NCR5380_select(struct Scsi_Host
*instance
, struct scsi_cmnd
*cmd
)
968 __releases(&hostdata
->lock
) __acquires(&hostdata
->lock
)
970 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
971 unsigned char tmp
[3], phase
;
976 bool can_disconnect
= instance
->irq
!= NO_IRQ
&&
977 cmd
->cmnd
[0] != REQUEST_SENSE
&&
978 (disconnect_mask
& BIT(scmd_id(cmd
)));
980 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
981 dsprintk(NDEBUG_ARBITRATION
, instance
, "starting arbitration, id = %d\n",
985 * Arbitration and selection phases are slow and involve dropping the
986 * lock, so we have to watch out for EH. An exception handler may
987 * change 'selecting' to NULL. This function will then return false
988 * so that the caller will forget about 'cmd'. (During information
989 * transfer phases, EH may change 'connected' to NULL.)
991 hostdata
->selecting
= cmd
;
994 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
995 * data bus during SELECTION.
998 NCR5380_write(TARGET_COMMAND_REG
, 0);
1001 * Start arbitration.
1004 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1005 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1007 /* The chip now waits for BUS FREE phase. Then after the 800 ns
1008 * Bus Free Delay, arbitration will begin.
1011 spin_unlock_irq(&hostdata
->lock
);
1012 err
= NCR5380_poll_politely2(hostdata
, MODE_REG
, MR_ARBITRATE
, 0,
1013 INITIATOR_COMMAND_REG
, ICR_ARBITRATION_PROGRESS
,
1014 ICR_ARBITRATION_PROGRESS
, HZ
);
1015 spin_lock_irq(&hostdata
->lock
);
1016 if (!(NCR5380_read(MODE_REG
) & MR_ARBITRATE
)) {
1017 /* Reselection interrupt */
1020 if (!hostdata
->selecting
) {
1021 /* Command was aborted */
1022 NCR5380_write(MODE_REG
, MR_BASE
);
1026 NCR5380_write(MODE_REG
, MR_BASE
);
1027 shost_printk(KERN_ERR
, instance
,
1028 "select: arbitration timeout\n");
1031 spin_unlock_irq(&hostdata
->lock
);
1033 /* The SCSI-2 arbitration delay is 2.4 us */
1036 /* Check for lost arbitration */
1037 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1038 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1039 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
)) {
1040 NCR5380_write(MODE_REG
, MR_BASE
);
1041 dsprintk(NDEBUG_ARBITRATION
, instance
, "lost arbitration, deasserting MR_ARBITRATE\n");
1042 spin_lock_irq(&hostdata
->lock
);
1046 /* After/during arbitration, BSY should be asserted.
1047 * IBM DPES-31080 Version S31Q works now
1048 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1050 NCR5380_write(INITIATOR_COMMAND_REG
,
1051 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1054 * Again, bus clear + bus settle time is 1.2us, however, this is
1055 * a minimum so we'll udelay ceil(1.2)
1058 if (hostdata
->flags
& FLAG_TOSHIBA_DELAY
)
1063 spin_lock_irq(&hostdata
->lock
);
1065 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */
1066 if (!(NCR5380_read(MODE_REG
) & MR_ARBITRATE
))
1069 if (!hostdata
->selecting
) {
1070 NCR5380_write(MODE_REG
, MR_BASE
);
1071 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1075 dsprintk(NDEBUG_ARBITRATION
, instance
, "won arbitration\n");
1078 * Now that we have won arbitration, start Selection process, asserting
1079 * the host and target ID's on the SCSI bus.
1082 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
| (1 << scmd_id(cmd
)));
1085 * Raise ATN while SEL is true before BSY goes false from arbitration,
1086 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1087 * phase immediately after selection.
1090 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
|
1091 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
);
1092 NCR5380_write(MODE_REG
, MR_BASE
);
1095 * Reselect interrupts must be turned off prior to the dropping of BSY,
1096 * otherwise we will trigger an interrupt.
1098 NCR5380_write(SELECT_ENABLE_REG
, 0);
1100 spin_unlock_irq(&hostdata
->lock
);
1103 * The initiator shall then wait at least two deskew delays and release
1106 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1109 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
|
1110 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
);
1113 * Something weird happens when we cease to drive BSY - looks
1114 * like the board/chip is letting us do another read before the
1115 * appropriate propagation delay has expired, and we're confusing
1116 * a BSY signal from ourselves as the target's response to SELECTION.
1118 * A small delay (the 'C++' frontend breaks the pipeline with an
1119 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1120 * tighter 'C' code breaks and requires this) solves the problem -
1121 * the 1 us delay is arbitrary, and only used because this delay will
1122 * be the same on other platforms and since it works here, it should
1125 * wingel suggests that this could be due to failing to wait
1131 dsprintk(NDEBUG_SELECTION
, instance
, "selecting target %d\n", scmd_id(cmd
));
1134 * The SCSI specification calls for a 250 ms timeout for the actual
1138 err
= NCR5380_poll_politely(hostdata
, STATUS_REG
, SR_BSY
, SR_BSY
,
1139 msecs_to_jiffies(250));
1141 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1142 spin_lock_irq(&hostdata
->lock
);
1143 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1144 NCR5380_reselect(instance
);
1145 shost_printk(KERN_ERR
, instance
, "reselection after won arbitration?\n");
1150 spin_lock_irq(&hostdata
->lock
);
1151 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1153 /* Can't touch cmd if it has been reclaimed by the scsi ML */
1154 if (!hostdata
->selecting
)
1157 cmd
->result
= DID_BAD_TARGET
<< 16;
1158 complete_cmd(instance
, cmd
);
1159 dsprintk(NDEBUG_SELECTION
, instance
,
1160 "target did not respond within 250ms\n");
1166 * No less than two deskew delays after the initiator detects the
1167 * BSY signal is true, it shall release the SEL signal and may
1168 * change the DATA BUS. -wingel
1173 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1176 * Since we followed the SCSI spec, and raised ATN while SEL
1177 * was true but before BSY was false during selection, the information
1178 * transfer phase should be a MESSAGE OUT phase so that we can send the
1182 /* Wait for start of REQ/ACK handshake */
1184 err
= NCR5380_poll_politely(hostdata
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
1185 spin_lock_irq(&hostdata
->lock
);
1187 shost_printk(KERN_ERR
, instance
, "select: REQ timeout\n");
1188 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1191 if (!hostdata
->selecting
) {
1192 do_abort(instance
, 0);
1196 dsprintk(NDEBUG_SELECTION
, instance
, "target %d selected, going into MESSAGE OUT phase.\n",
1198 tmp
[0] = IDENTIFY(can_disconnect
, cmd
->device
->lun
);
1202 phase
= PHASE_MSGOUT
;
1203 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 0);
1205 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1206 cmd
->result
= DID_ERROR
<< 16;
1207 complete_cmd(instance
, cmd
);
1208 dsprintk(NDEBUG_SELECTION
, instance
, "IDENTIFY message transfer failed\n");
1213 dsprintk(NDEBUG_SELECTION
, instance
, "nexus established.\n");
1215 hostdata
->connected
= cmd
;
1216 hostdata
->busy
[cmd
->device
->id
] |= 1 << cmd
->device
->lun
;
1218 #ifdef SUN3_SCSI_VME
1219 dregs
->csr
|= CSR_INTR
;
1222 initialize_SCp(cmd
);
1227 if (!hostdata
->selecting
)
1229 hostdata
->selecting
= NULL
;
1234 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1235 * unsigned char *phase, int *count, unsigned char **data)
1237 * Purpose : transfers data in given phase using polled I/O
1239 * Inputs : instance - instance of driver, *phase - pointer to
1240 * what phase is expected, *count - pointer to number of
1241 * bytes to transfer, **data - pointer to data pointer,
1242 * can_sleep - 1 or 0 when sleeping is permitted or not, respectively.
1244 * Returns : -1 when different phase is entered without transferring
1245 * maximum number of bytes, 0 if all bytes are transferred or exit
1248 * Also, *phase, *count, *data are modified in place.
1250 * XXX Note : handling for bus free may be useful.
1254 * Note : this code is not as quick as it could be, however it
1255 * IS 100% reliable, and for the actual data transfer where speed
1256 * counts, we will always do a pseudo DMA or DMA transfer.
1259 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1260 unsigned char *phase
, int *count
,
1261 unsigned char **data
, unsigned int can_sleep
)
1263 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1264 unsigned char p
= *phase
, tmp
;
1266 unsigned char *d
= *data
;
1269 * The NCR5380 chip will only drive the SCSI bus when the
1270 * phase specified in the appropriate bits of the TARGET COMMAND
1271 * REGISTER match the STATUS REGISTER
1274 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1278 * Wait for assertion of REQ, after which the phase bits will be
1282 if (NCR5380_poll_politely(hostdata
, STATUS_REG
, SR_REQ
, SR_REQ
,
1283 HZ
* can_sleep
) < 0)
1286 dsprintk(NDEBUG_HANDSHAKE
, instance
, "REQ asserted\n");
1288 /* Check for phase mismatch */
1289 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) != p
) {
1290 dsprintk(NDEBUG_PIO
, instance
, "phase mismatch\n");
1291 NCR5380_dprint_phase(NDEBUG_PIO
, instance
);
1295 /* Do actual transfer from SCSI bus to / from memory */
1297 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1299 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1304 * The SCSI standard suggests that in MSGOUT phase, the initiator
1305 * should drop ATN on the last byte of the message phase
1306 * after REQ has been asserted for the handshake but before
1307 * the initiator raises ACK.
1311 if (!((p
& SR_MSG
) && c
> 1)) {
1312 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1313 NCR5380_dprint(NDEBUG_PIO
, instance
);
1314 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1315 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1317 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1318 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1319 NCR5380_dprint(NDEBUG_PIO
, instance
);
1320 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1321 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1324 NCR5380_dprint(NDEBUG_PIO
, instance
);
1325 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1328 if (NCR5380_poll_politely(hostdata
,
1329 STATUS_REG
, SR_REQ
, 0, 5 * HZ
* can_sleep
) < 0)
1332 dsprintk(NDEBUG_HANDSHAKE
, instance
, "REQ negated, handshake complete\n");
1335 * We have several special cases to consider during REQ/ACK handshaking :
1336 * 1. We were in MSGOUT phase, and we are on the last byte of the
1337 * message. ATN must be dropped as ACK is dropped.
1339 * 2. We are in a MSGIN phase, and we are on the last byte of the
1340 * message. We must exit with ACK asserted, so that the calling
1341 * code may raise ATN before dropping ACK to reject the message.
1343 * 3. ACK and ATN are clear and the target may proceed as normal.
1345 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1346 if (p
== PHASE_MSGOUT
&& c
> 1)
1347 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1349 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1353 dsprintk(NDEBUG_PIO
, instance
, "residual %d\n", c
);
1357 tmp
= NCR5380_read(STATUS_REG
);
1358 /* The phase read from the bus is valid if either REQ is (already)
1359 * asserted or if ACK hasn't been released yet. The latter applies if
1360 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1362 if ((tmp
& SR_REQ
) || ((tmp
& SR_IO
) && c
== 0))
1363 *phase
= tmp
& PHASE_MASK
;
1365 *phase
= PHASE_UNKNOWN
;
1367 if (!c
|| (*phase
== p
))
1374 * do_reset - issue a reset command
1375 * @instance: adapter to reset
1377 * Issue a reset sequence to the NCR5380 and try and get the bus
1378 * back into sane shape.
1380 * This clears the reset interrupt flag because there may be no handler for
1381 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1382 * been installed. And when in EH we may have released the ST DMA interrupt.
1385 static void do_reset(struct Scsi_Host
*instance
)
1387 struct NCR5380_hostdata __maybe_unused
*hostdata
= shost_priv(instance
);
1388 unsigned long flags
;
1390 local_irq_save(flags
);
1391 NCR5380_write(TARGET_COMMAND_REG
,
1392 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
) & PHASE_MASK
));
1393 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
1395 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1396 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1397 local_irq_restore(flags
);
1401 * do_abort - abort the currently established nexus by going to
1402 * MESSAGE OUT phase and sending an ABORT message.
1403 * @instance: relevant scsi host instance
1404 * @can_sleep: 1 or 0 when sleeping is permitted or not, respectively
1406 * Returns 0 on success, negative error code on failure.
1409 static int do_abort(struct Scsi_Host
*instance
, unsigned int can_sleep
)
1411 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1412 unsigned char *msgptr
, phase
, tmp
;
1416 /* Request message out phase */
1417 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1420 * Wait for the target to indicate a valid phase by asserting
1421 * REQ. Once this happens, we'll have either a MSGOUT phase
1422 * and can immediately send the ABORT message, or we'll have some
1423 * other phase and will have to source/sink data.
1425 * We really don't care what value was on the bus or what value
1426 * the target sees, so we just handshake.
1429 rc
= NCR5380_poll_politely(hostdata
, STATUS_REG
, SR_REQ
, SR_REQ
,
1430 10 * HZ
* can_sleep
);
1434 tmp
= NCR5380_read(STATUS_REG
) & PHASE_MASK
;
1436 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1438 if (tmp
!= PHASE_MSGOUT
) {
1439 NCR5380_write(INITIATOR_COMMAND_REG
,
1440 ICR_BASE
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1441 rc
= NCR5380_poll_politely(hostdata
, STATUS_REG
, SR_REQ
, 0,
1442 3 * HZ
* can_sleep
);
1445 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1451 phase
= PHASE_MSGOUT
;
1452 NCR5380_transfer_pio(instance
, &phase
, &len
, &msgptr
, can_sleep
);
1457 * If we got here, and the command completed successfully,
1458 * we're about to go into bus free state.
1462 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1467 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1468 * unsigned char *phase, int *count, unsigned char **data)
1470 * Purpose : transfers data in given phase using either real
1473 * Inputs : instance - instance of driver, *phase - pointer to
1474 * what phase is expected, *count - pointer to number of
1475 * bytes to transfer, **data - pointer to data pointer.
1477 * Returns : -1 when different phase is entered without transferring
1478 * maximum number of bytes, 0 if all bytes or transferred or exit
1481 * Also, *phase, *count, *data are modified in place.
1485 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1486 unsigned char *phase
, int *count
,
1487 unsigned char **data
)
1489 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1491 unsigned char p
= *phase
;
1492 unsigned char *d
= *data
;
1496 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1501 hostdata
->connected
->SCp
.phase
= p
;
1504 if (hostdata
->read_overruns
)
1505 c
-= hostdata
->read_overruns
;
1506 else if (hostdata
->flags
& FLAG_DMA_FIXUP
)
1510 dsprintk(NDEBUG_DMA
, instance
, "initializing DMA %s: length %d, address %p\n",
1511 (p
& SR_IO
) ? "receive" : "send", c
, d
);
1514 /* send start chain */
1515 sun3scsi_dma_start(c
, *data
);
1518 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1519 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_MONITOR_BSY
|
1520 MR_ENABLE_EOP_INTR
);
1522 if (!(hostdata
->flags
& FLAG_LATE_DMA_SETUP
)) {
1523 /* On the Medusa, it is a must to initialize the DMA before
1524 * starting the NCR. This is also the cleaner way for the TT.
1527 result
= NCR5380_dma_recv_setup(hostdata
, d
, c
);
1529 result
= NCR5380_dma_send_setup(hostdata
, d
, c
);
1533 * On the PAS16 at least I/O recovery delays are not needed here.
1534 * Everyone else seems to want them.
1538 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1539 NCR5380_io_delay(1);
1540 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1542 NCR5380_io_delay(1);
1543 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1544 NCR5380_io_delay(1);
1545 NCR5380_write(START_DMA_SEND_REG
, 0);
1546 NCR5380_io_delay(1);
1550 #ifdef SUN3_SCSI_VME
1551 dregs
->csr
|= CSR_DMA_ENABLE
;
1553 sun3_dma_active
= 1;
1556 if (hostdata
->flags
& FLAG_LATE_DMA_SETUP
) {
1557 /* On the Falcon, the DMA setup must be done after the last
1558 * NCR access, else the DMA setup gets trashed!
1561 result
= NCR5380_dma_recv_setup(hostdata
, d
, c
);
1563 result
= NCR5380_dma_send_setup(hostdata
, d
, c
);
1566 /* On failure, NCR5380_dma_xxxx_setup() returns a negative int. */
1570 /* For real DMA, result is the byte count. DMA interrupt is expected. */
1572 hostdata
->dma_len
= result
;
1576 /* The result is zero iff pseudo DMA send/receive was completed. */
1577 hostdata
->dma_len
= c
;
1580 * A note regarding the DMA errata workarounds for early NMOS silicon.
1582 * For DMA sends, we want to wait until the last byte has been
1583 * transferred out over the bus before we turn off DMA mode. Alas, there
1584 * seems to be no terribly good way of doing this on a 5380 under all
1585 * conditions. For non-scatter-gather operations, we can wait until REQ
1586 * and ACK both go false, or until a phase mismatch occurs. Gather-sends
1587 * are nastier, since the device will be expecting more data than we
1588 * are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1589 * could test Last Byte Sent to assure transfer (I imagine this is precisely
1590 * why this signal was added to the newer chips) but on the older 538[01]
1591 * this signal does not exist. The workaround for this lack is a watchdog;
1592 * we bail out of the wait-loop after a modest amount of wait-time if
1593 * the usual exit conditions are not met. Not a terribly clean or
1594 * correct solution :-%
1596 * DMA receive is equally tricky due to a nasty characteristic of the NCR5380.
1597 * If the chip is in DMA receive mode, it will respond to a target's
1598 * REQ by latching the SCSI data into the INPUT DATA register and asserting
1599 * ACK, even if it has _already_ been notified by the DMA controller that
1600 * the current DMA transfer has completed! If the NCR5380 is then taken
1601 * out of DMA mode, this already-acknowledged byte is lost. This is
1602 * not a problem for "one DMA transfer per READ command", because
1603 * the situation will never arise... either all of the data is DMA'ed
1604 * properly, or the target switches to MESSAGE IN phase to signal a
1605 * disconnection (either operation bringing the DMA to a clean halt).
1606 * However, in order to handle scatter-receive, we must work around the
1607 * problem. The chosen fix is to DMA fewer bytes, then check for the
1608 * condition before taking the NCR5380 out of DMA mode. One or two extra
1609 * bytes are transferred via PIO as necessary to fill out the original
1613 if (hostdata
->flags
& FLAG_DMA_FIXUP
) {
1616 * The workaround was to transfer fewer bytes than we
1617 * intended to with the pseudo-DMA read function, wait for
1618 * the chip to latch the last byte, read it, and then disable
1621 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1622 * REQ is deasserted when ACK is asserted, and not reasserted
1623 * until ACK goes false. Since the NCR5380 won't lower ACK
1624 * until DACK is asserted, which won't happen unless we twiddle
1625 * the DMA port or we take the NCR5380 out of DMA mode, we
1626 * can guarantee that we won't handshake another extra
1630 if (NCR5380_poll_politely(hostdata
, BUS_AND_STATUS_REG
,
1631 BASR_DRQ
, BASR_DRQ
, 0) < 0) {
1633 shost_printk(KERN_ERR
, instance
, "PDMA read: DRQ timeout\n");
1635 if (NCR5380_poll_politely(hostdata
, STATUS_REG
,
1636 SR_REQ
, 0, 0) < 0) {
1638 shost_printk(KERN_ERR
, instance
, "PDMA read: !REQ timeout\n");
1640 d
[*count
- 1] = NCR5380_read(INPUT_DATA_REG
);
1643 * Wait for the last byte to be sent. If REQ is being asserted for
1644 * the byte we're interested, we'll ACK it and it will go false.
1646 if (NCR5380_poll_politely2(hostdata
,
1647 BUS_AND_STATUS_REG
, BASR_DRQ
, BASR_DRQ
,
1648 BUS_AND_STATUS_REG
, BASR_PHASE_MATCH
, 0, 0) < 0) {
1650 shost_printk(KERN_ERR
, instance
, "PDMA write: DRQ and phase timeout\n");
1655 NCR5380_dma_complete(instance
);
1660 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1662 * Purpose : run through the various SCSI phases and do as the target
1663 * directs us to. Operates on the currently connected command,
1664 * instance->connected.
1666 * Inputs : instance, instance for which we are doing commands
1668 * Side effects : SCSI things happen, the disconnected queue will be
1669 * modified if a command disconnects, *instance->connected will
1672 * XXX Note : we need to watch for bus free or a reset condition here
1673 * to recover from an unexpected bus free condition.
1676 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
1677 __releases(&hostdata
->lock
) __acquires(&hostdata
->lock
)
1679 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
1680 unsigned char msgout
= NOP
;
1684 unsigned char *data
;
1685 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
1686 struct scsi_cmnd
*cmd
;
1688 #ifdef SUN3_SCSI_VME
1689 dregs
->csr
|= CSR_INTR
;
1692 while ((cmd
= hostdata
->connected
)) {
1693 struct NCR5380_cmd
*ncmd
= scsi_cmd_priv(cmd
);
1695 tmp
= NCR5380_read(STATUS_REG
);
1696 /* We only have a valid SCSI phase when REQ is asserted */
1698 phase
= (tmp
& PHASE_MASK
);
1699 if (phase
!= old_phase
) {
1701 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
1704 if (phase
== PHASE_CMDOUT
&&
1705 sun3_dma_setup_done
!= cmd
) {
1708 advance_sg_buffer(cmd
);
1710 count
= sun3scsi_dma_xfer_len(hostdata
, cmd
);
1713 if (cmd
->sc_data_direction
== DMA_TO_DEVICE
)
1714 sun3scsi_dma_send_setup(hostdata
,
1715 cmd
->SCp
.ptr
, count
);
1717 sun3scsi_dma_recv_setup(hostdata
,
1718 cmd
->SCp
.ptr
, count
);
1719 sun3_dma_setup_done
= cmd
;
1721 #ifdef SUN3_SCSI_VME
1722 dregs
->csr
|= CSR_INTR
;
1725 #endif /* CONFIG_SUN3 */
1727 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
1728 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1730 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1732 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1734 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1742 #if (NDEBUG & NDEBUG_NO_DATAOUT)
1743 shost_printk(KERN_DEBUG
, instance
, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n");
1745 do_abort(instance
, 0);
1746 cmd
->result
= DID_ERROR
<< 16;
1747 complete_cmd(instance
, cmd
);
1748 hostdata
->connected
= NULL
;
1749 hostdata
->busy
[scmd_id(cmd
)] &= ~(1 << cmd
->device
->lun
);
1754 * If there is no room left in the current buffer in the
1755 * scatter-gather list, move onto the next one.
1758 advance_sg_buffer(cmd
);
1759 dsprintk(NDEBUG_INFORMATION
, instance
,
1760 "this residual %d, sg ents %d\n",
1761 cmd
->SCp
.this_residual
,
1762 sg_nents(cmd
->SCp
.buffer
));
1765 * The preferred transfer method is going to be
1766 * PSEUDO-DMA for systems that are strictly PIO,
1767 * since we can let the hardware do the handshaking.
1769 * For this to work, we need to know the transfersize
1770 * ahead of time, since the pseudo-DMA code will sit
1771 * in an unconditional loop.
1775 if (!cmd
->device
->borken
)
1776 transfersize
= NCR5380_dma_xfer_len(hostdata
, cmd
);
1778 if (transfersize
> 0) {
1780 if (NCR5380_transfer_dma(instance
, &phase
,
1781 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
1783 * If the watchdog timer fires, all future
1784 * accesses to this device will use the
1787 scmd_printk(KERN_INFO
, cmd
,
1788 "switching to slow handshake\n");
1789 cmd
->device
->borken
= 1;
1791 bus_reset_cleanup(instance
);
1794 /* Transfer a small chunk so that the
1795 * irq mode lock is not held too long.
1797 transfersize
= min(cmd
->SCp
.this_residual
,
1798 NCR5380_PIO_CHUNK_SIZE
);
1800 NCR5380_transfer_pio(instance
, &phase
, &len
,
1801 (unsigned char **)&cmd
->SCp
.ptr
,
1803 cmd
->SCp
.this_residual
-= transfersize
- len
;
1806 if (sun3_dma_setup_done
== cmd
)
1807 sun3_dma_setup_done
= NULL
;
1813 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 0);
1814 cmd
->SCp
.Message
= tmp
;
1818 set_host_byte(cmd
, DID_ABORT
);
1820 case COMMAND_COMPLETE
:
1821 /* Accept message by clearing ACK */
1823 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1824 dsprintk(NDEBUG_QUEUES
, instance
,
1825 "COMMAND COMPLETE %p target %d lun %llu\n",
1826 cmd
, scmd_id(cmd
), cmd
->device
->lun
);
1828 hostdata
->connected
= NULL
;
1829 hostdata
->busy
[scmd_id(cmd
)] &= ~(1 << cmd
->device
->lun
);
1831 set_status_byte(cmd
, cmd
->SCp
.Status
);
1833 set_resid_from_SCp(cmd
);
1835 if (cmd
->cmnd
[0] == REQUEST_SENSE
)
1836 complete_cmd(instance
, cmd
);
1838 if (cmd
->SCp
.Status
== SAM_STAT_CHECK_CONDITION
||
1839 cmd
->SCp
.Status
== SAM_STAT_COMMAND_TERMINATED
) {
1840 dsprintk(NDEBUG_QUEUES
, instance
, "autosense: adding cmd %p to tail of autosense queue\n",
1842 list_add_tail(&ncmd
->list
,
1843 &hostdata
->autosense
);
1845 complete_cmd(instance
, cmd
);
1849 * Restore phase bits to 0 so an interrupted selection,
1850 * arbitration can resume.
1852 NCR5380_write(TARGET_COMMAND_REG
, 0);
1855 case MESSAGE_REJECT
:
1856 /* Accept message by clearing ACK */
1857 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1858 switch (hostdata
->last_message
) {
1859 case HEAD_OF_QUEUE_TAG
:
1860 case ORDERED_QUEUE_TAG
:
1861 case SIMPLE_QUEUE_TAG
:
1862 cmd
->device
->simple_tags
= 0;
1863 hostdata
->busy
[cmd
->device
->id
] |= (1 << (cmd
->device
->lun
& 0xFF));
1870 /* Accept message by clearing ACK */
1871 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1872 hostdata
->connected
= NULL
;
1873 list_add(&ncmd
->list
, &hostdata
->disconnected
);
1874 dsprintk(NDEBUG_INFORMATION
| NDEBUG_QUEUES
,
1875 instance
, "connected command %p for target %d lun %llu moved to disconnected queue\n",
1876 cmd
, scmd_id(cmd
), cmd
->device
->lun
);
1879 * Restore phase bits to 0 so an interrupted selection,
1880 * arbitration can resume.
1882 NCR5380_write(TARGET_COMMAND_REG
, 0);
1884 #ifdef SUN3_SCSI_VME
1885 dregs
->csr
|= CSR_DMA_ENABLE
;
1889 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
1890 * operation, in violation of the SCSI spec so we can safely
1891 * ignore SAVE/RESTORE pointers calls.
1893 * Unfortunately, some disks violate the SCSI spec and
1894 * don't issue the required SAVE_POINTERS message before
1895 * disconnecting, and we have to break spec to remain
1899 case RESTORE_POINTERS
:
1900 /* Accept message by clearing ACK */
1901 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1903 case EXTENDED_MESSAGE
:
1905 * Start the message buffer with the EXTENDED_MESSAGE
1906 * byte, since spi_print_msg() wants the whole thing.
1908 extended_msg
[0] = EXTENDED_MESSAGE
;
1909 /* Accept first byte by clearing ACK */
1910 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1912 spin_unlock_irq(&hostdata
->lock
);
1914 dsprintk(NDEBUG_EXTENDED
, instance
, "receiving extended message\n");
1917 data
= extended_msg
+ 1;
1918 phase
= PHASE_MSGIN
;
1919 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 1);
1920 dsprintk(NDEBUG_EXTENDED
, instance
, "length %d, code 0x%02x\n",
1921 (int)extended_msg
[1],
1922 (int)extended_msg
[2]);
1924 if (!len
&& extended_msg
[1] > 0 &&
1925 extended_msg
[1] <= sizeof(extended_msg
) - 2) {
1926 /* Accept third byte by clearing ACK */
1927 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1928 len
= extended_msg
[1] - 1;
1929 data
= extended_msg
+ 3;
1930 phase
= PHASE_MSGIN
;
1932 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 1);
1933 dsprintk(NDEBUG_EXTENDED
, instance
, "message received, residual %d\n",
1936 switch (extended_msg
[2]) {
1942 shost_printk(KERN_ERR
, instance
, "error receiving extended message\n");
1945 shost_printk(KERN_NOTICE
, instance
, "extended message code %02x length %d is too long\n",
1946 extended_msg
[2], extended_msg
[1]);
1950 spin_lock_irq(&hostdata
->lock
);
1951 if (!hostdata
->connected
)
1954 /* Reject message */
1958 * If we get something weird that we aren't expecting,
1961 if (tmp
== EXTENDED_MESSAGE
)
1962 scmd_printk(KERN_INFO
, cmd
,
1963 "rejecting unknown extended message code %02x, length %d\n",
1964 extended_msg
[2], extended_msg
[1]);
1966 scmd_printk(KERN_INFO
, cmd
,
1967 "rejecting unknown message code %02x\n",
1970 msgout
= MESSAGE_REJECT
;
1971 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1973 } /* switch (tmp) */
1978 hostdata
->last_message
= msgout
;
1979 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 0);
1980 if (msgout
== ABORT
) {
1981 hostdata
->connected
= NULL
;
1982 hostdata
->busy
[scmd_id(cmd
)] &= ~(1 << cmd
->device
->lun
);
1983 cmd
->result
= DID_ERROR
<< 16;
1984 complete_cmd(instance
, cmd
);
1993 * XXX for performance reasons, on machines with a
1994 * PSEUDO-DMA architecture we should probably
1995 * use the dma transfer function.
1997 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 0);
2002 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 0);
2003 cmd
->SCp
.Status
= tmp
;
2006 shost_printk(KERN_ERR
, instance
, "unknown phase\n");
2007 NCR5380_dprint(NDEBUG_ANY
, instance
);
2008 } /* switch(phase) */
2010 spin_unlock_irq(&hostdata
->lock
);
2011 NCR5380_poll_politely(hostdata
, STATUS_REG
, SR_REQ
, SR_REQ
, HZ
);
2012 spin_lock_irq(&hostdata
->lock
);
2018 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2020 * Purpose : does reselection, initializing the instance->connected
2021 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2022 * nexus has been reestablished,
2024 * Inputs : instance - this instance of the NCR5380.
2027 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2029 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2030 unsigned char target_mask
;
2032 unsigned char msg
[3];
2033 struct NCR5380_cmd
*ncmd
;
2034 struct scsi_cmnd
*tmp
;
2037 * Disable arbitration, etc. since the host adapter obviously
2038 * lost, and tell an interrupted NCR5380_select() to restart.
2041 NCR5380_write(MODE_REG
, MR_BASE
);
2043 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2044 if (!target_mask
|| target_mask
& (target_mask
- 1)) {
2045 shost_printk(KERN_WARNING
, instance
,
2046 "reselect: bad target_mask 0x%02x\n", target_mask
);
2051 * At this point, we have detected that our SCSI ID is on the bus,
2052 * SEL is true and BSY was false for at least one bus settle delay
2055 * We must assert BSY ourselves, until the target drops the SEL
2059 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2060 if (NCR5380_poll_politely(hostdata
,
2061 STATUS_REG
, SR_SEL
, 0, 0) < 0) {
2062 shost_printk(KERN_ERR
, instance
, "reselect: !SEL timeout\n");
2063 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2066 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2069 * Wait for target to go into MSGIN.
2072 if (NCR5380_poll_politely(hostdata
,
2073 STATUS_REG
, SR_REQ
, SR_REQ
, 0) < 0) {
2074 if ((NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_SEL
)) == 0)
2075 /* BUS FREE phase */
2077 shost_printk(KERN_ERR
, instance
, "reselect: REQ timeout\n");
2078 do_abort(instance
, 0);
2083 /* acknowledge toggle to MSGIN */
2084 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(PHASE_MSGIN
));
2086 /* peek at the byte without really hitting the bus */
2087 msg
[0] = NCR5380_read(CURRENT_SCSI_DATA_REG
);
2091 unsigned char *data
= msg
;
2092 unsigned char phase
= PHASE_MSGIN
;
2094 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
, 0);
2097 do_abort(instance
, 0);
2101 #endif /* CONFIG_SUN3 */
2103 if (!(msg
[0] & 0x80)) {
2104 shost_printk(KERN_ERR
, instance
, "expecting IDENTIFY message, got ");
2107 do_abort(instance
, 0);
2110 lun
= msg
[0] & 0x07;
2113 * We need to add code for SCSI-II to track which devices have
2114 * I_T_L_Q nexuses established, and which have simple I_T_L
2115 * nexuses so we can chose to do additional data transfer.
2119 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2120 * just reestablished, and remove it from the disconnected queue.
2124 list_for_each_entry(ncmd
, &hostdata
->disconnected
, list
) {
2125 struct scsi_cmnd
*cmd
= NCR5380_to_scmd(ncmd
);
2127 if (target_mask
== (1 << scmd_id(cmd
)) &&
2128 lun
== (u8
)cmd
->device
->lun
) {
2129 list_del(&ncmd
->list
);
2136 dsprintk(NDEBUG_RESELECTION
| NDEBUG_QUEUES
, instance
,
2137 "reselect: removed %p from disconnected queue\n", tmp
);
2139 int target
= ffs(target_mask
) - 1;
2141 shost_printk(KERN_ERR
, instance
, "target bitmask 0x%02x lun %d not in disconnected queue.\n",
2144 * Since we have an established nexus that we can't do anything
2145 * with, we must abort it.
2147 if (do_abort(instance
, 0) == 0)
2148 hostdata
->busy
[target
] &= ~(1 << lun
);
2153 if (sun3_dma_setup_done
!= tmp
) {
2156 advance_sg_buffer(tmp
);
2158 count
= sun3scsi_dma_xfer_len(hostdata
, tmp
);
2161 if (tmp
->sc_data_direction
== DMA_TO_DEVICE
)
2162 sun3scsi_dma_send_setup(hostdata
,
2163 tmp
->SCp
.ptr
, count
);
2165 sun3scsi_dma_recv_setup(hostdata
,
2166 tmp
->SCp
.ptr
, count
);
2167 sun3_dma_setup_done
= tmp
;
2171 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2172 #endif /* CONFIG_SUN3 */
2174 /* Accept message by clearing ACK */
2175 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2177 hostdata
->connected
= tmp
;
2178 dsprintk(NDEBUG_RESELECTION
, instance
, "nexus established, target %d, lun %llu\n",
2179 scmd_id(tmp
), tmp
->device
->lun
);
2183 * list_find_cmd - test for presence of a command in a linked list
2184 * @haystack: list of commands
2185 * @needle: command to search for
2188 static bool list_find_cmd(struct list_head
*haystack
,
2189 struct scsi_cmnd
*needle
)
2191 struct NCR5380_cmd
*ncmd
;
2193 list_for_each_entry(ncmd
, haystack
, list
)
2194 if (NCR5380_to_scmd(ncmd
) == needle
)
2200 * list_remove_cmd - remove a command from linked list
2201 * @haystack: list of commands
2202 * @needle: command to remove
2205 static bool list_del_cmd(struct list_head
*haystack
,
2206 struct scsi_cmnd
*needle
)
2208 if (list_find_cmd(haystack
, needle
)) {
2209 struct NCR5380_cmd
*ncmd
= scsi_cmd_priv(needle
);
2211 list_del(&ncmd
->list
);
2218 * NCR5380_abort - scsi host eh_abort_handler() method
2219 * @cmd: the command to be aborted
2221 * Try to abort a given command by removing it from queues and/or sending
2222 * the target an abort message. This may not succeed in causing a target
2223 * to abort the command. Nonetheless, the low-level driver must forget about
2224 * the command because the mid-layer reclaims it and it may be re-issued.
2226 * The normal path taken by a command is as follows. For EH we trace this
2227 * same path to locate and abort the command.
2229 * unissued -> selecting -> [unissued -> selecting ->]... connected ->
2230 * [disconnected -> connected ->]...
2231 * [autosense -> connected ->] done
2233 * If cmd was not found at all then presumably it has already been completed,
2234 * in which case return SUCCESS to try to avoid further EH measures.
2236 * If the command has not completed yet, we must not fail to find it.
2237 * We have no option but to forget the aborted command (even if it still
2238 * lacks sense data). The mid-layer may re-issue a command that is in error
2239 * recovery (see scsi_send_eh_cmnd), but the logic and data structures in
2240 * this driver are such that a command can appear on one queue only.
2242 * The lock protects driver data structures, but EH handlers also use it
2243 * to serialize their own execution and prevent their own re-entry.
2246 static int NCR5380_abort(struct scsi_cmnd
*cmd
)
2248 struct Scsi_Host
*instance
= cmd
->device
->host
;
2249 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2250 unsigned long flags
;
2251 int result
= SUCCESS
;
2253 spin_lock_irqsave(&hostdata
->lock
, flags
);
2255 #if (NDEBUG & NDEBUG_ANY)
2256 scmd_printk(KERN_INFO
, cmd
, __func__
);
2258 NCR5380_dprint(NDEBUG_ANY
, instance
);
2259 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
2261 if (list_del_cmd(&hostdata
->unissued
, cmd
)) {
2262 dsprintk(NDEBUG_ABORT
, instance
,
2263 "abort: removed %p from issue queue\n", cmd
);
2264 cmd
->result
= DID_ABORT
<< 16;
2265 cmd
->scsi_done(cmd
); /* No tag or busy flag to worry about */
2269 if (hostdata
->selecting
== cmd
) {
2270 dsprintk(NDEBUG_ABORT
, instance
,
2271 "abort: cmd %p == selecting\n", cmd
);
2272 hostdata
->selecting
= NULL
;
2273 cmd
->result
= DID_ABORT
<< 16;
2274 complete_cmd(instance
, cmd
);
2278 if (list_del_cmd(&hostdata
->disconnected
, cmd
)) {
2279 dsprintk(NDEBUG_ABORT
, instance
,
2280 "abort: removed %p from disconnected list\n", cmd
);
2281 /* Can't call NCR5380_select() and send ABORT because that
2282 * means releasing the lock. Need a bus reset.
2284 set_host_byte(cmd
, DID_ERROR
);
2285 complete_cmd(instance
, cmd
);
2290 if (hostdata
->connected
== cmd
) {
2291 dsprintk(NDEBUG_ABORT
, instance
, "abort: cmd %p is connected\n", cmd
);
2292 hostdata
->connected
= NULL
;
2293 hostdata
->dma_len
= 0;
2294 if (do_abort(instance
, 0) < 0) {
2295 set_host_byte(cmd
, DID_ERROR
);
2296 complete_cmd(instance
, cmd
);
2300 set_host_byte(cmd
, DID_ABORT
);
2301 complete_cmd(instance
, cmd
);
2305 if (list_del_cmd(&hostdata
->autosense
, cmd
)) {
2306 dsprintk(NDEBUG_ABORT
, instance
,
2307 "abort: removed %p from sense queue\n", cmd
);
2308 complete_cmd(instance
, cmd
);
2312 if (result
== FAILED
)
2313 dsprintk(NDEBUG_ABORT
, instance
, "abort: failed to abort %p\n", cmd
);
2315 hostdata
->busy
[scmd_id(cmd
)] &= ~(1 << cmd
->device
->lun
);
2316 dsprintk(NDEBUG_ABORT
, instance
, "abort: successfully aborted %p\n", cmd
);
2319 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
2320 spin_unlock_irqrestore(&hostdata
->lock
, flags
);
2326 static void bus_reset_cleanup(struct Scsi_Host
*instance
)
2328 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2330 struct NCR5380_cmd
*ncmd
;
2332 /* reset NCR registers */
2333 NCR5380_write(MODE_REG
, MR_BASE
);
2334 NCR5380_write(TARGET_COMMAND_REG
, 0);
2335 NCR5380_write(SELECT_ENABLE_REG
, 0);
2337 /* After the reset, there are no more connected or disconnected commands
2338 * and no busy units; so clear the low-level status here to avoid
2339 * conflicts when the mid-level code tries to wake up the affected
2343 if (hostdata
->selecting
) {
2344 hostdata
->selecting
->result
= DID_RESET
<< 16;
2345 complete_cmd(instance
, hostdata
->selecting
);
2346 hostdata
->selecting
= NULL
;
2349 list_for_each_entry(ncmd
, &hostdata
->disconnected
, list
) {
2350 struct scsi_cmnd
*cmd
= NCR5380_to_scmd(ncmd
);
2352 set_host_byte(cmd
, DID_RESET
);
2353 complete_cmd(instance
, cmd
);
2355 INIT_LIST_HEAD(&hostdata
->disconnected
);
2357 list_for_each_entry(ncmd
, &hostdata
->autosense
, list
) {
2358 struct scsi_cmnd
*cmd
= NCR5380_to_scmd(ncmd
);
2360 cmd
->scsi_done(cmd
);
2362 INIT_LIST_HEAD(&hostdata
->autosense
);
2364 if (hostdata
->connected
) {
2365 set_host_byte(hostdata
->connected
, DID_RESET
);
2366 complete_cmd(instance
, hostdata
->connected
);
2367 hostdata
->connected
= NULL
;
2370 for (i
= 0; i
< 8; ++i
)
2371 hostdata
->busy
[i
] = 0;
2372 hostdata
->dma_len
= 0;
2374 queue_work(hostdata
->work_q
, &hostdata
->main_task
);
2378 * NCR5380_host_reset - reset the SCSI host
2379 * @cmd: SCSI command undergoing EH
2384 static int NCR5380_host_reset(struct scsi_cmnd
*cmd
)
2386 struct Scsi_Host
*instance
= cmd
->device
->host
;
2387 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
2388 unsigned long flags
;
2389 struct NCR5380_cmd
*ncmd
;
2391 spin_lock_irqsave(&hostdata
->lock
, flags
);
2393 #if (NDEBUG & NDEBUG_ANY)
2394 shost_printk(KERN_INFO
, instance
, __func__
);
2396 NCR5380_dprint(NDEBUG_ANY
, instance
);
2397 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
2399 list_for_each_entry(ncmd
, &hostdata
->unissued
, list
) {
2400 struct scsi_cmnd
*scmd
= NCR5380_to_scmd(ncmd
);
2402 scmd
->result
= DID_RESET
<< 16;
2403 scmd
->scsi_done(scmd
);
2405 INIT_LIST_HEAD(&hostdata
->unissued
);
2408 bus_reset_cleanup(instance
);
2410 spin_unlock_irqrestore(&hostdata
->lock
, flags
);