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 * DISTRIBUTION RELEASE 6.
16 * For more information, please consult
19 * SCSI Protocol Controller
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
37 * possible DMA transfer size should also happen for REAL_DMA. I added this
38 * in the #if statement.
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
43 * - The interrupt service routine should run main after end of DMA, too (not
44 * only after RESELECTION interrupts). Additionally, it should _not_ test
45 * for more interrupts after running main, since a DMA process may have
46 * been started and interrupts are turned on now. The new int could happen
47 * inside the execution of NCR5380_intr(), leading to recursive
50 * - I've added a function merge_contiguous_buffers() that tries to
51 * merge scatter-gather buffers that are located at contiguous
52 * physical addresses and can be processed with the same DMA setup.
53 * Since most scatter-gather operations work on a page (4K) of
54 * 4 buffers (1K), in more than 90% of all cases three interrupts and
55 * DMA setup actions are saved.
57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
58 * and USLEEP, because these were messing up readability and will never be
59 * needed for Atari SCSI.
61 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
62 * stuff), and 'main' is executed in a bottom half if awoken by an
65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
66 * constructs. In my eyes, this made the source rather unreadable, so I
67 * finally replaced that by the *_PRINTK() macros.
72 * Further development / testing that should be done :
73 * 1. Test linked command handling code after Eric is ready with
74 * the high level code.
76 #include <scsi/scsi_dbg.h>
77 #include <scsi/scsi_transport_spi.h>
79 #if (NDEBUG & NDEBUG_LISTS)
82 printk("LINE:%d Adding %p to %p\n", \
83 __LINE__, (void*)(x), (void*)(y)); \
87 #define REMOVE(w, x, y, z) \
89 printk("LINE:%d Removing: %p->%p %p->%p \n", \
90 __LINE__, (void*)(w), (void*)(x), \
91 (void*)(y), (void*)(z)); \
97 #define REMOVE(w,x,y,z)
108 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
109 * and specifically for each board rather than each chip. This makes their
110 * adaptation to platforms like the Mac (Some of which use NCR5380's)
111 * more difficult than it has to be.
113 * Also, many of the SCSI drivers were written before the command queuing
114 * routines were implemented, meaning their implementations of queued
115 * commands were hacked on rather than designed in from the start.
117 * When I designed the Linux SCSI drivers I figured that
118 * while having two different SCSI boards in a system might be useful
119 * for debugging things, two of the same type wouldn't be used.
120 * Well, I was wrong and a number of users have mailed me about running
121 * multiple high-performance SCSI boards in a server.
123 * Finally, when I get questions from users, I have no idea what
124 * revision of my driver they are running.
126 * This driver attempts to address these problems :
127 * This is a generic 5380 driver. To use it on a different platform,
128 * one simply writes appropriate system specific macros (ie, data
129 * transfer - some PC's will use the I/O bus, 68K's must use
130 * memory mapped) and drops this file in their 'C' wrapper.
132 * As far as command queueing, two queues are maintained for
133 * each 5380 in the system - commands that haven't been issued yet,
134 * and commands that are currently executing. This means that an
135 * unlimited number of commands may be queued, letting
136 * more commands propagate from the higher driver levels giving higher
137 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
138 * allowing multiple commands to propagate all the way to a SCSI-II device
139 * while a command is already executing.
141 * To solve the multiple-boards-in-the-same-system problem,
142 * there is a separate instance structure for each instance
143 * of a 5380 in the system. So, multiple NCR5380 drivers will
144 * be able to coexist with appropriate changes to the high level
147 * Issues specific to the NCR5380 :
149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150 * piece of hardware that requires you to sit in a loop polling for
151 * the REQ signal as long as you are connected. Some devices are
152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153 * while doing long seek operations.
155 * The workaround for this is to keep track of devices that have
156 * disconnected. If the device hasn't disconnected, for commands that
157 * should disconnect, we do something like
159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
161 * Some tweaking of N and M needs to be done. An algorithm based
162 * on "time to data" would give the best results as long as short time
163 * to datas (ie, on the same track) were considered, however these
164 * broken devices are the exception rather than the rule and I'd rather
165 * spend my time optimizing for the normal case.
169 * At the heart of the design is a coroutine, NCR5380_main,
170 * which is started when not running by the interrupt handler,
171 * timer, and queue command function. It attempts to establish
172 * I_T_L or I_T_L_Q nexuses by removing the commands from the
173 * issue queue and calling NCR5380_select() if a nexus
174 * is not established.
176 * Once a nexus is established, the NCR5380_information_transfer()
177 * phase goes through the various phases as instructed by the target.
178 * if the target goes into MSG IN and sends a DISCONNECT message,
179 * the command structure is placed into the per instance disconnected
180 * queue, and NCR5380_main tries to find more work. If USLEEP
181 * was defined, and the target is idle for too long, the system
184 * If a command has disconnected, eventually an interrupt will trigger,
185 * calling NCR5380_intr() which will in turn call NCR5380_reselect
186 * to reestablish a nexus. This will run main if necessary.
188 * On command termination, the done function will be called as
191 * SCSI pointers are maintained in the SCp field of SCSI command
192 * structures, being initialized after the command is connected
193 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
194 * Note that in violation of the standard, an implicit SAVE POINTERS operation
195 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
200 * This file a skeleton Linux SCSI driver for the NCR 5380 series
201 * of chips. To use it, you write an architecture specific functions
202 * and macros and include this file in your driver.
204 * These macros control options :
205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206 * for commands that return with a CHECK CONDITION status.
208 * LINKED - if defined, linked commands are supported.
210 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
212 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
214 * These macros MUST be defined :
216 * NCR5380_read(register) - read from the specified register
218 * NCR5380_write(register, value) - write to the specific register
220 * Either real DMA *or* pseudo DMA may be implemented
222 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
223 * Note that the DMA setup functions should return the number of bytes
224 * that they were able to program the controller for.
226 * Also note that generic i386/PC versions of these macros are
227 * available as NCR5380_i386_dma_write_setup,
228 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
230 * NCR5380_dma_write_setup(instance, src, count) - initialize
231 * NCR5380_dma_read_setup(instance, dst, count) - initialize
232 * NCR5380_dma_residual(instance); - residual count
235 * NCR5380_pwrite(instance, src, count)
236 * NCR5380_pread(instance, dst, count);
238 * If nothing specific to this implementation needs doing (ie, with external
239 * hardware), you must also define
241 * NCR5380_queue_command
245 * to be the global entry points into the specific driver, ie
246 * #define NCR5380_queue_command t128_queue_command.
248 * If this is not done, the routines will be defined as static functions
249 * with the NCR5380* names and the user must provide a globally
250 * accessible wrapper function.
252 * The generic driver is initialized by calling NCR5380_init(instance),
253 * after setting the appropriate host specific fields and ID. If the
254 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
255 * possible) function may be used.
258 static struct Scsi_Host
*first_instance
= NULL
;
259 static struct scsi_host_template
*the_template
= NULL
;
261 /* Macros ease life... :-) */
262 #define SETUP_HOSTDATA(in) \
263 struct NCR5380_hostdata *hostdata = \
264 (struct NCR5380_hostdata *)(in)->hostdata
265 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
267 #define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble)
268 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
269 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble)
271 #define HOSTNO instance->host_no
272 #define H_NO(cmd) (cmd)->device->host->host_no
277 * Functions for handling tagged queuing
278 * =====================================
280 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
282 * Using consecutive numbers for the tags is no good idea in my eyes. There
283 * could be wrong re-usings if the counter (8 bit!) wraps and some early
284 * command has been preempted for a long time. My solution: a bitfield for
285 * remembering used tags.
287 * There's also the problem that each target has a certain queue size, but we
288 * cannot know it in advance :-( We just see a QUEUE_FULL status being
289 * returned. So, in this case, the driver internal queue size assumption is
290 * reduced to the number of active tags if QUEUE_FULL is returned by the
291 * target. The command is returned to the mid-level, but with status changed
292 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
295 * We're also not allowed running tagged commands as long as an untagged
296 * command is active. And REQUEST SENSE commands after a contingent allegiance
297 * condition _must_ be untagged. To keep track whether an untagged command has
298 * been issued, the host->busy array is still employed, as it is without
299 * support for tagged queuing.
301 * One could suspect that there are possible race conditions between
302 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
303 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
304 * which already guaranteed to be running at most once. It is also the only
305 * place where tags/LUNs are allocated. So no other allocation can slip
306 * between that pair, there could only happen a reselection, which can free a
307 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
308 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
312 DECLARE_BITMAP(allocated
, MAX_TAGS
);
317 static TAG_ALLOC TagAlloc
[8][8]; /* 8 targets and 8 LUNs */
320 static void __init
init_tags(void)
325 if (!setup_use_tagged_queuing
)
328 for (target
= 0; target
< 8; ++target
) {
329 for (lun
= 0; lun
< 8; ++lun
) {
330 ta
= &TagAlloc
[target
][lun
];
331 bitmap_zero(ta
->allocated
, MAX_TAGS
);
332 ta
->nr_allocated
= 0;
333 /* At the beginning, assume the maximum queue size we could
334 * support (MAX_TAGS). This value will be decreased if the target
335 * returns QUEUE_FULL status.
337 ta
->queue_size
= MAX_TAGS
;
343 /* Check if we can issue a command to this LUN: First see if the LUN is marked
344 * busy by an untagged command. If the command should use tagged queuing, also
345 * check that there is a free tag and the target's queue won't overflow. This
346 * function should be called with interrupts disabled to avoid race
350 static int is_lun_busy(Scsi_Cmnd
*cmd
, int should_be_tagged
)
352 u8 lun
= cmd
->device
->lun
;
353 SETUP_HOSTDATA(cmd
->device
->host
);
355 if (hostdata
->busy
[cmd
->device
->id
] & (1 << lun
))
357 if (!should_be_tagged
||
358 !setup_use_tagged_queuing
|| !cmd
->device
->tagged_supported
)
360 if (TagAlloc
[cmd
->device
->id
][lun
].nr_allocated
>=
361 TagAlloc
[cmd
->device
->id
][lun
].queue_size
) {
362 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d: no free tags\n",
363 H_NO(cmd
), cmd
->device
->id
, lun
);
370 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
371 * must be called before!), or reserve the LUN in 'busy' if the command is
375 static void cmd_get_tag(Scsi_Cmnd
*cmd
, int should_be_tagged
)
377 u8 lun
= cmd
->device
->lun
;
378 SETUP_HOSTDATA(cmd
->device
->host
);
380 /* If we or the target don't support tagged queuing, allocate the LUN for
381 * an untagged command.
383 if (!should_be_tagged
||
384 !setup_use_tagged_queuing
|| !cmd
->device
->tagged_supported
) {
386 hostdata
->busy
[cmd
->device
->id
] |= (1 << lun
);
387 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d now allocated by untagged "
388 "command\n", H_NO(cmd
), cmd
->device
->id
, lun
);
390 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][lun
];
392 cmd
->tag
= find_first_zero_bit(ta
->allocated
, MAX_TAGS
);
393 set_bit(cmd
->tag
, ta
->allocated
);
395 dprintk(NDEBUG_TAGS
, "scsi%d: using tag %d for target %d lun %d "
396 "(now %d tags in use)\n",
397 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
,
398 lun
, ta
->nr_allocated
);
403 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
407 static void cmd_free_tag(Scsi_Cmnd
*cmd
)
409 u8 lun
= cmd
->device
->lun
;
410 SETUP_HOSTDATA(cmd
->device
->host
);
412 if (cmd
->tag
== TAG_NONE
) {
413 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << lun
);
414 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %d untagged cmd finished\n",
415 H_NO(cmd
), cmd
->device
->id
, lun
);
416 } else if (cmd
->tag
>= MAX_TAGS
) {
417 printk(KERN_NOTICE
"scsi%d: trying to free bad tag %d!\n",
418 H_NO(cmd
), cmd
->tag
);
420 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][lun
];
421 clear_bit(cmd
->tag
, ta
->allocated
);
423 dprintk(NDEBUG_TAGS
, "scsi%d: freed tag %d for target %d lun %d\n",
424 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
, lun
);
429 static void free_all_tags(void)
434 if (!setup_use_tagged_queuing
)
437 for (target
= 0; target
< 8; ++target
) {
438 for (lun
= 0; lun
< 8; ++lun
) {
439 ta
= &TagAlloc
[target
][lun
];
440 bitmap_zero(ta
->allocated
, MAX_TAGS
);
441 ta
->nr_allocated
= 0;
446 #endif /* SUPPORT_TAGS */
450 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
452 * Purpose: Try to merge several scatter-gather requests into one DMA
453 * transfer. This is possible if the scatter buffers lie on
454 * physical contiguous addresses.
456 * Parameters: Scsi_Cmnd *cmd
457 * The command to work on. The first scatter buffer's data are
458 * assumed to be already transferred into ptr/this_residual.
461 static void merge_contiguous_buffers(Scsi_Cmnd
*cmd
)
463 unsigned long endaddr
;
464 #if (NDEBUG & NDEBUG_MERGING)
465 unsigned long oldlen
= cmd
->SCp
.this_residual
;
469 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
470 cmd
->SCp
.buffers_residual
&&
471 virt_to_phys(sg_virt(&cmd
->SCp
.buffer
[1])) == endaddr
;) {
472 dprintk(NDEBUG_MERGING
, "VTOP(%p) == %08lx -> merging\n",
473 page_address(sg_page(&cmd
->SCp
.buffer
[1])), endaddr
);
474 #if (NDEBUG & NDEBUG_MERGING)
478 --cmd
->SCp
.buffers_residual
;
479 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
480 endaddr
+= cmd
->SCp
.buffer
->length
;
482 #if (NDEBUG & NDEBUG_MERGING)
483 if (oldlen
!= cmd
->SCp
.this_residual
)
484 dprintk(NDEBUG_MERGING
, "merged %d buffers from %p, new length %08x\n",
485 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
490 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
492 * Purpose : initialize the saved data pointers for cmd to point to the
493 * start of the buffer.
495 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
498 static inline void initialize_SCp(Scsi_Cmnd
*cmd
)
501 * Initialize the Scsi Pointer field so that all of the commands in the
502 * various queues are valid.
505 if (scsi_bufflen(cmd
)) {
506 cmd
->SCp
.buffer
= scsi_sglist(cmd
);
507 cmd
->SCp
.buffers_residual
= scsi_sg_count(cmd
) - 1;
508 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
509 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
510 /* ++roman: Try to merge some scatter-buffers if they are at
511 * contiguous physical addresses.
513 merge_contiguous_buffers(cmd
);
515 cmd
->SCp
.buffer
= NULL
;
516 cmd
->SCp
.buffers_residual
= 0;
518 cmd
->SCp
.this_residual
= 0;
522 #include <linux/delay.h>
529 { SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
530 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
531 { SR_SEL
, "SEL" }, {0, NULL
}
533 {BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}
535 {ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
536 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
537 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
540 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"}, {MR_TARGET
, "MODE TARGET"},
541 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR
,
542 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR
,"MODE EOP INTR"},
543 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
544 {MR_DMA_MODE
, "MODE DMA"}, {MR_ARBITRATE
, "MODE ARBITRATION"},
549 * Function : void NCR5380_print(struct Scsi_Host *instance)
551 * Purpose : print the SCSI bus signals for debugging purposes
553 * Input : instance - which NCR5380
556 static void NCR5380_print(struct Scsi_Host
*instance
)
558 unsigned char status
, data
, basr
, mr
, icr
, i
;
561 local_irq_save(flags
);
562 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
563 status
= NCR5380_read(STATUS_REG
);
564 mr
= NCR5380_read(MODE_REG
);
565 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
566 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
567 local_irq_restore(flags
);
568 printk("STATUS_REG: %02x ", status
);
569 for (i
= 0; signals
[i
].mask
; ++i
)
570 if (status
& signals
[i
].mask
)
571 printk(",%s", signals
[i
].name
);
572 printk("\nBASR: %02x ", basr
);
573 for (i
= 0; basrs
[i
].mask
; ++i
)
574 if (basr
& basrs
[i
].mask
)
575 printk(",%s", basrs
[i
].name
);
576 printk("\nICR: %02x ", icr
);
577 for (i
= 0; icrs
[i
].mask
; ++i
)
578 if (icr
& icrs
[i
].mask
)
579 printk(",%s", icrs
[i
].name
);
580 printk("\nMODE: %02x ", mr
);
581 for (i
= 0; mrs
[i
].mask
; ++i
)
582 if (mr
& mrs
[i
].mask
)
583 printk(",%s", mrs
[i
].name
);
591 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
592 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
593 {PHASE_UNKNOWN
, "UNKNOWN"}
597 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
599 * Purpose : print the current SCSI phase for debugging purposes
601 * Input : instance - which NCR5380
604 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
606 unsigned char status
;
609 status
= NCR5380_read(STATUS_REG
);
610 if (!(status
& SR_REQ
))
611 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
613 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
614 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
616 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
623 * ++roman: New scheme of calling NCR5380_main()
625 * If we're not in an interrupt, we can call our main directly, it cannot be
626 * already running. Else, we queue it on a task queue, if not 'main_running'
627 * tells us that a lower level is already executing it. This way,
628 * 'main_running' needs not be protected in a special way.
630 * queue_main() is a utility function for putting our main onto the task
631 * queue, if main_running is false. It should be called only from a
632 * interrupt or bottom half.
635 #include <linux/gfp.h>
636 #include <linux/workqueue.h>
637 #include <linux/interrupt.h>
639 static volatile int main_running
;
640 static DECLARE_WORK(NCR5380_tqueue
, NCR5380_main
);
642 static inline void queue_main(void)
645 /* If in interrupt and NCR5380_main() not already running,
646 queue it on the 'immediate' task queue, to be processed
647 immediately after the current interrupt processing has
649 schedule_work(&NCR5380_tqueue
);
651 /* else: nothing to do: the running NCR5380_main() will pick up
652 any newly queued command. */
656 static inline void NCR5380_all_init(void)
660 dprintk(NDEBUG_INIT
, "scsi : NCR5380_all_init()\n");
666 * NCR58380_info - report driver and host information
667 * @instance: relevant scsi host instance
669 * For use as the host template info() handler.
674 static const char *NCR5380_info(struct Scsi_Host
*instance
)
676 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
678 return hostdata
->info
;
681 static void prepare_info(struct Scsi_Host
*instance
)
683 struct NCR5380_hostdata
*hostdata
= shost_priv(instance
);
685 snprintf(hostdata
->info
, sizeof(hostdata
->info
),
686 "%s, io_port 0x%lx, n_io_port %d, "
687 "base 0x%lx, irq %d, "
688 "can_queue %d, cmd_per_lun %d, "
689 "sg_tablesize %d, this_id %d, "
691 instance
->hostt
->name
, instance
->io_port
, instance
->n_io_port
,
692 instance
->base
, instance
->irq
,
693 instance
->can_queue
, instance
->cmd_per_lun
,
694 instance
->sg_tablesize
, instance
->this_id
,
711 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
713 * Purpose : print commands in the various queues, called from
714 * NCR5380_abort and NCR5380_debug to aid debugging.
716 * Inputs : instance, pointer to this instance.
719 static void lprint_Scsi_Cmnd(Scsi_Cmnd
*cmd
)
722 unsigned char *command
;
723 printk("scsi%d: destination target %d, lun %llu\n",
724 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
725 printk(KERN_CONT
" command = ");
727 printk(KERN_CONT
"%2d (0x%02x)", command
[0], command
[0]);
728 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
729 printk(KERN_CONT
" %02x", command
[i
]);
733 static void NCR5380_print_status(struct Scsi_Host
*instance
)
735 struct NCR5380_hostdata
*hostdata
;
739 NCR5380_dprint(NDEBUG_ANY
, instance
);
740 NCR5380_dprint_phase(NDEBUG_ANY
, instance
);
742 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
744 printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE
);
745 local_irq_save(flags
);
746 printk("NCR5380: coroutine is%s running.\n",
747 main_running
? "" : "n't");
748 if (!hostdata
->connected
)
749 printk("scsi%d: no currently connected command\n", HOSTNO
);
751 lprint_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
);
752 printk("scsi%d: issue_queue\n", HOSTNO
);
753 for (ptr
= (Scsi_Cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
))
754 lprint_Scsi_Cmnd(ptr
);
756 printk("scsi%d: disconnected_queue\n", HOSTNO
);
757 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
;
759 lprint_Scsi_Cmnd(ptr
);
761 local_irq_restore(flags
);
765 static void show_Scsi_Cmnd(Scsi_Cmnd
*cmd
, struct seq_file
*m
)
768 unsigned char *command
;
769 seq_printf(m
, "scsi%d: destination target %d, lun %llu\n",
770 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
771 seq_printf(m
, " command = ");
773 seq_printf(m
, "%2d (0x%02x)", command
[0], command
[0]);
774 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
775 seq_printf(m
, " %02x", command
[i
]);
779 static int __maybe_unused
NCR5380_show_info(struct seq_file
*m
,
780 struct Scsi_Host
*instance
)
782 struct NCR5380_hostdata
*hostdata
;
786 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
788 seq_printf(m
, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE
);
789 local_irq_save(flags
);
790 seq_printf(m
, "NCR5380: coroutine is%s running.\n",
791 main_running
? "" : "n't");
792 if (!hostdata
->connected
)
793 seq_printf(m
, "scsi%d: no currently connected command\n", HOSTNO
);
795 show_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
, m
);
796 seq_printf(m
, "scsi%d: issue_queue\n", HOSTNO
);
797 for (ptr
= (Scsi_Cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
))
798 show_Scsi_Cmnd(ptr
, m
);
800 seq_printf(m
, "scsi%d: disconnected_queue\n", HOSTNO
);
801 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
;
803 show_Scsi_Cmnd(ptr
, m
);
805 local_irq_restore(flags
);
810 * Function : void NCR5380_init (struct Scsi_Host *instance)
812 * Purpose : initializes *instance and corresponding 5380 chip.
814 * Inputs : instance - instantiation of the 5380 driver.
816 * Notes : I assume that the host, hostno, and id bits have been
817 * set correctly. I don't care about the irq and other fields.
821 static int __init
NCR5380_init(struct Scsi_Host
*instance
, int flags
)
824 SETUP_HOSTDATA(instance
);
828 hostdata
->aborted
= 0;
829 hostdata
->id_mask
= 1 << instance
->this_id
;
830 hostdata
->id_higher_mask
= 0;
831 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
832 if (i
> hostdata
->id_mask
)
833 hostdata
->id_higher_mask
|= i
;
834 for (i
= 0; i
< 8; ++i
)
835 hostdata
->busy
[i
] = 0;
839 #if defined (REAL_DMA)
840 hostdata
->dma_len
= 0;
842 hostdata
->targets_present
= 0;
843 hostdata
->connected
= NULL
;
844 hostdata
->issue_queue
= NULL
;
845 hostdata
->disconnected_queue
= NULL
;
846 hostdata
->flags
= FLAG_CHECK_LAST_BYTE_SENT
;
849 the_template
= instance
->hostt
;
850 first_instance
= instance
;
853 prepare_info(instance
);
855 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
856 NCR5380_write(MODE_REG
, MR_BASE
);
857 NCR5380_write(TARGET_COMMAND_REG
, 0);
858 NCR5380_write(SELECT_ENABLE_REG
, 0);
863 static void NCR5380_exit(struct Scsi_Host
*instance
)
865 /* Empty, as we didn't schedule any delayed work */
869 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
870 * void (*done)(Scsi_Cmnd *))
872 * Purpose : enqueues a SCSI command
874 * Inputs : cmd - SCSI command, done - function called on completion, with
875 * a pointer to the command descriptor.
880 * cmd is added to the per instance issue_queue, with minor
881 * twiddling done to the host specific fields of cmd. If the
882 * main coroutine is not running, it is restarted.
886 static int NCR5380_queue_command_lck(Scsi_Cmnd
*cmd
, void (*done
)(Scsi_Cmnd
*))
888 SETUP_HOSTDATA(cmd
->device
->host
);
892 #if (NDEBUG & NDEBUG_NO_WRITE)
893 switch (cmd
->cmnd
[0]) {
896 printk(KERN_NOTICE
"scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
898 cmd
->result
= (DID_ERROR
<< 16);
902 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
905 * We use the host_scribble field as a pointer to the next command
910 cmd
->scsi_done
= done
;
915 * Insert the cmd into the issue queue. Note that REQUEST SENSE
916 * commands are added to the head of the queue since any command will
917 * clear the contingent allegiance condition that exists and the
918 * sense data is only guaranteed to be valid while the condition exists.
921 local_irq_save(flags
);
922 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
923 * Otherwise a running NCR5380_main may steal the lock.
924 * Lock before actually inserting due to fairness reasons explained in
925 * atari_scsi.c. If we insert first, then it's impossible for this driver
926 * to release the lock.
927 * Stop timer for this command while waiting for the lock, or timeouts
928 * may happen (and they really do), and it's no good if the command doesn't
929 * appear in any of the queues.
930 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
931 * because also a timer int can trigger an abort or reset, which would
932 * alter queues and touch the lock.
935 /* perhaps stop command timer here */
937 /* perhaps restart command timer here */
939 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
940 LIST(cmd
, hostdata
->issue_queue
);
941 SET_NEXT(cmd
, hostdata
->issue_queue
);
942 hostdata
->issue_queue
= cmd
;
944 for (tmp
= (Scsi_Cmnd
*)hostdata
->issue_queue
;
945 NEXT(tmp
); tmp
= NEXT(tmp
))
950 local_irq_restore(flags
);
952 dprintk(NDEBUG_QUEUES
, "scsi%d: command added to %s of queue\n", H_NO(cmd
),
953 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
955 /* If queue_command() is called from an interrupt (real one or bottom
956 * half), we let queue_main() do the job of taking care about main. If it
957 * is already running, this is a no-op, else main will be queued.
959 * If we're not in an interrupt, we can call NCR5380_main()
960 * unconditionally, because it cannot be already running.
962 if (in_interrupt() || ((flags
>> 8) & 7) >= 6)
969 static DEF_SCSI_QCMD(NCR5380_queue_command
)
972 * Function : NCR5380_main (void)
974 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
975 * be done on the NCR5380 host adapters in a system. Both
976 * NCR5380_queue_command() and NCR5380_intr() will try to start it
977 * in case it is not running.
979 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
980 * reenable them. This prevents reentrancy and kernel stack overflow.
983 static void NCR5380_main(struct work_struct
*work
)
985 Scsi_Cmnd
*tmp
, *prev
;
986 struct Scsi_Host
*instance
= first_instance
;
987 struct NCR5380_hostdata
*hostdata
= HOSTDATA(instance
);
992 * We run (with interrupts disabled) until we're sure that none of
993 * the host adapters have anything that can be done, at which point
994 * we set main_running to 0 and exit.
996 * Interrupts are enabled before doing various other internal
997 * instructions, after we've decided that we need to run through
1000 * this should prevent any race conditions.
1002 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1003 * because also a timer int can trigger an abort or reset, which can
1004 * alter queues and touch the Falcon lock.
1007 /* Tell int handlers main() is now already executing. Note that
1008 no races are possible here. If an int comes in before
1009 'main_running' is set here, and queues/executes main via the
1010 task queue, it doesn't do any harm, just this instance of main
1011 won't find any work left to do. */
1016 local_save_flags(flags
);
1018 local_irq_disable(); /* Freeze request queues */
1021 if (!hostdata
->connected
) {
1022 dprintk(NDEBUG_MAIN
, "scsi%d: not connected\n", HOSTNO
);
1024 * Search through the issue_queue for a command destined
1025 * for a target that's not busy.
1027 #if (NDEBUG & NDEBUG_LISTS)
1028 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
1029 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
1031 /*printk("%p ", tmp);*/
1032 if ((tmp
== prev
) && tmp
)
1034 /* else printk("\n"); */
1036 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
,
1037 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
1038 u8 lun
= tmp
->device
->lun
;
1040 #if (NDEBUG & NDEBUG_LISTS)
1042 printk("MAIN tmp=%p target=%d busy=%d lun=%llu\n",
1043 tmp
, tmp
->device
->id
, hostdata
->busy
[tmp
->device
->id
],
1046 /* When we find one, remove it from the issue queue. */
1047 /* ++guenther: possible race with Falcon locking */
1050 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
1052 !(hostdata
->busy
[tmp
->device
->id
] & (1 << lun
))
1055 /* ++guenther: just to be sure, this must be atomic */
1056 local_irq_disable();
1058 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
1059 SET_NEXT(prev
, NEXT(tmp
));
1061 REMOVE(-1, hostdata
->issue_queue
, tmp
, NEXT(tmp
));
1062 hostdata
->issue_queue
= NEXT(tmp
);
1064 SET_NEXT(tmp
, NULL
);
1065 falcon_dont_release
++;
1067 /* reenable interrupts after finding one */
1068 local_irq_restore(flags
);
1071 * Attempt to establish an I_T_L nexus here.
1072 * On success, instance->hostdata->connected is set.
1073 * On failure, we must add the command back to the
1074 * issue queue so we can keep trying.
1076 dprintk(NDEBUG_MAIN
, "scsi%d: main(): command for target %d "
1077 "lun %d removed from issue_queue\n",
1078 HOSTNO
, tmp
->device
->id
, lun
);
1080 * REQUEST SENSE commands are issued without tagged
1081 * queueing, even on SCSI-II devices because the
1082 * contingent allegiance condition exists for the
1085 /* ++roman: ...and the standard also requires that
1086 * REQUEST SENSE command are untagged.
1090 cmd_get_tag(tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
1092 if (!NCR5380_select(instance
, tmp
)) {
1093 falcon_dont_release
--;
1094 /* release if target did not response! */
1095 falcon_release_lock_if_possible(hostdata
);
1098 local_irq_disable();
1099 LIST(tmp
, hostdata
->issue_queue
);
1100 SET_NEXT(tmp
, hostdata
->issue_queue
);
1101 hostdata
->issue_queue
= tmp
;
1105 falcon_dont_release
--;
1106 local_irq_restore(flags
);
1107 dprintk(NDEBUG_MAIN
, "scsi%d: main(): select() failed, "
1108 "returned to issue_queue\n", HOSTNO
);
1109 if (hostdata
->connected
)
1112 } /* if target/lun/target queue is not busy */
1113 } /* for issue_queue */
1114 } /* if (!hostdata->connected) */
1116 if (hostdata
->connected
1118 && !hostdata
->dma_len
1121 local_irq_restore(flags
);
1122 dprintk(NDEBUG_MAIN
, "scsi%d: main: performing information transfer\n",
1124 NCR5380_information_transfer(instance
);
1125 dprintk(NDEBUG_MAIN
, "scsi%d: main: done set false\n", HOSTNO
);
1130 /* Better allow ints _after_ 'main_running' has been cleared, else
1131 an interrupt could believe we'll pick up the work it left for
1132 us, but we won't see it anymore here... */
1134 local_irq_restore(flags
);
1140 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1142 * Purpose : Called by interrupt handler when DMA finishes or a phase
1143 * mismatch occurs (which would finish the DMA transfer).
1145 * Inputs : instance - this instance of the NCR5380.
1149 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
1151 SETUP_HOSTDATA(instance
);
1152 int transfered
, saved_data
= 0, overrun
= 0, cnt
, toPIO
;
1153 unsigned char **data
, p
;
1154 volatile int *count
;
1156 if (!hostdata
->connected
) {
1157 printk(KERN_WARNING
"scsi%d: received end of DMA interrupt with "
1158 "no connected cmd\n", HOSTNO
);
1162 if (atari_read_overruns
) {
1163 p
= hostdata
->connected
->SCp
.phase
;
1166 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
1167 (BASR_PHASE_MATCH
|BASR_ACK
)) ==
1168 (BASR_PHASE_MATCH
|BASR_ACK
)) {
1169 saved_data
= NCR5380_read(INPUT_DATA_REG
);
1171 dprintk(NDEBUG_DMA
, "scsi%d: read overrun handled\n", HOSTNO
);
1176 dprintk(NDEBUG_DMA
, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1177 HOSTNO
, NCR5380_read(BUS_AND_STATUS_REG
),
1178 NCR5380_read(STATUS_REG
));
1180 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1181 NCR5380_write(MODE_REG
, MR_BASE
);
1182 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1184 transfered
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1185 hostdata
->dma_len
= 0;
1187 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
1188 count
= &hostdata
->connected
->SCp
.this_residual
;
1189 *data
+= transfered
;
1190 *count
-= transfered
;
1192 if (atari_read_overruns
) {
1193 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
1194 cnt
= toPIO
= atari_read_overruns
;
1196 dprintk(NDEBUG_DMA
, "Got an input overrun, using saved byte\n");
1197 *(*data
)++ = saved_data
;
1202 dprintk(NDEBUG_DMA
, "Doing %d-byte PIO to 0x%08lx\n", cnt
, (long)*data
);
1203 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
);
1204 *count
-= toPIO
- cnt
;
1208 #endif /* REAL_DMA */
1212 * Function : void NCR5380_intr (int irq)
1214 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1215 * from the disconnected queue, and restarting NCR5380_main()
1218 * Inputs : int irq, irq that caused this interrupt.
1222 static irqreturn_t
NCR5380_intr(int irq
, void *dev_id
)
1224 struct Scsi_Host
*instance
= first_instance
;
1225 int done
= 1, handled
= 0;
1228 dprintk(NDEBUG_INTR
, "scsi%d: NCR5380 irq triggered\n", HOSTNO
);
1230 /* Look for pending interrupts */
1231 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1232 dprintk(NDEBUG_INTR
, "scsi%d: BASR=%02x\n", HOSTNO
, basr
);
1233 /* dispatch to appropriate routine if found and done=0 */
1234 if (basr
& BASR_IRQ
) {
1235 NCR5380_dprint(NDEBUG_INTR
, instance
);
1236 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
|SR_IO
)) == (SR_SEL
|SR_IO
)) {
1239 dprintk(NDEBUG_INTR
, "scsi%d: SEL interrupt\n", HOSTNO
);
1240 NCR5380_reselect(instance
);
1241 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1242 } else if (basr
& BASR_PARITY_ERROR
) {
1243 dprintk(NDEBUG_INTR
, "scsi%d: PARITY interrupt\n", HOSTNO
);
1244 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1245 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1246 dprintk(NDEBUG_INTR
, "scsi%d: RESET interrupt\n", HOSTNO
);
1247 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1250 * The rest of the interrupt conditions can occur only during a
1254 #if defined(REAL_DMA)
1256 * We should only get PHASE MISMATCH and EOP interrupts if we have
1257 * DMA enabled, so do a sanity check based on the current setting
1258 * of the MODE register.
1261 if ((NCR5380_read(MODE_REG
) & MR_DMA_MODE
) &&
1262 ((basr
& BASR_END_DMA_TRANSFER
) ||
1263 !(basr
& BASR_PHASE_MATCH
))) {
1265 dprintk(NDEBUG_INTR
, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO
);
1266 NCR5380_dma_complete( instance
);
1270 #endif /* REAL_DMA */
1272 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1273 if (basr
& BASR_PHASE_MATCH
)
1274 printk(KERN_NOTICE
"scsi%d: unknown interrupt, "
1275 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1276 HOSTNO
, basr
, NCR5380_read(MODE_REG
),
1277 NCR5380_read(STATUS_REG
));
1278 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1280 } /* if !(SELECTION || PARITY) */
1282 } /* BASR & IRQ */ else {
1283 printk(KERN_NOTICE
"scsi%d: interrupt without IRQ bit set in BASR, "
1284 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO
, basr
,
1285 NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1286 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1290 dprintk(NDEBUG_INTR
, "scsi%d: in int routine, calling main\n", HOSTNO
);
1291 /* Put a call to NCR5380_main() on the queue... */
1294 return IRQ_RETVAL(handled
);
1298 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd)
1300 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1301 * including ARBITRATION, SELECTION, and initial message out for
1302 * IDENTIFY and queue messages.
1304 * Inputs : instance - instantiation of the 5380 driver on which this
1305 * target lives, cmd - SCSI command to execute.
1307 * Returns : -1 if selection could not execute for some reason,
1308 * 0 if selection succeeded or failed because the target
1312 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1313 * with registers as they should have been on entry - ie
1314 * SELECT_ENABLE will be set appropriately, the NCR5380
1315 * will cease to drive any SCSI bus signals.
1317 * If successful : I_T_L or I_T_L_Q nexus will be established,
1318 * instance->connected will be set to cmd.
1319 * SELECT interrupt will be disabled.
1321 * If failed (no target) : cmd->scsi_done() will be called, and the
1322 * cmd->result host byte set to DID_BAD_TARGET.
1325 static int NCR5380_select(struct Scsi_Host
*instance
, Scsi_Cmnd
*cmd
)
1327 SETUP_HOSTDATA(instance
);
1328 unsigned char tmp
[3], phase
;
1329 unsigned char *data
;
1331 unsigned long timeout
;
1332 unsigned long flags
;
1334 hostdata
->restart_select
= 0;
1335 NCR5380_dprint(NDEBUG_ARBITRATION
, instance
);
1336 dprintk(NDEBUG_ARBITRATION
, "scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1340 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1341 * data bus during SELECTION.
1344 local_irq_save(flags
);
1345 if (hostdata
->connected
) {
1346 local_irq_restore(flags
);
1349 NCR5380_write(TARGET_COMMAND_REG
, 0);
1352 * Start arbitration.
1355 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1356 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1358 local_irq_restore(flags
);
1360 /* Wait for arbitration logic to complete */
1361 #if defined(NCR_TIMEOUT)
1363 unsigned long timeout
= jiffies
+ 2*NCR_TIMEOUT
;
1365 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1366 time_before(jiffies
, timeout
) && !hostdata
->connected
)
1368 if (time_after_eq(jiffies
, timeout
)) {
1369 printk("scsi : arbitration timeout at %d\n", __LINE__
);
1370 NCR5380_write(MODE_REG
, MR_BASE
);
1371 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1375 #else /* NCR_TIMEOUT */
1376 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1377 !hostdata
->connected
)
1381 dprintk(NDEBUG_ARBITRATION
, "scsi%d: arbitration complete\n", HOSTNO
);
1383 if (hostdata
->connected
) {
1384 NCR5380_write(MODE_REG
, MR_BASE
);
1388 * The arbitration delay is 2.2us, but this is a minimum and there is
1389 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1390 * the integral nature of udelay().
1396 /* Check for lost arbitration */
1397 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1398 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1399 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1400 hostdata
->connected
) {
1401 NCR5380_write(MODE_REG
, MR_BASE
);
1402 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1407 /* after/during arbitration, BSY should be asserted.
1408 IBM DPES-31080 Version S31Q works now */
1409 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1410 NCR5380_write(INITIATOR_COMMAND_REG
,
1411 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1413 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1414 hostdata
->connected
) {
1415 NCR5380_write(MODE_REG
, MR_BASE
);
1416 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1417 dprintk(NDEBUG_ARBITRATION
, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1423 * Again, bus clear + bus settle time is 1.2us, however, this is
1424 * a minimum so we'll udelay ceil(1.2)
1427 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1428 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1434 if (hostdata
->connected
) {
1435 NCR5380_write(MODE_REG
, MR_BASE
);
1436 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1440 dprintk(NDEBUG_ARBITRATION
, "scsi%d: won arbitration\n", HOSTNO
);
1443 * Now that we have won arbitration, start Selection process, asserting
1444 * the host and target ID's on the SCSI bus.
1447 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1450 * Raise ATN while SEL is true before BSY goes false from arbitration,
1451 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1452 * phase immediately after selection.
1455 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1456 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1457 NCR5380_write(MODE_REG
, MR_BASE
);
1460 * Reselect interrupts must be turned off prior to the dropping of BSY,
1461 * otherwise we will trigger an interrupt.
1464 if (hostdata
->connected
) {
1465 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1469 NCR5380_write(SELECT_ENABLE_REG
, 0);
1472 * The initiator shall then wait at least two deskew delays and release
1475 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1478 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1479 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1482 * Something weird happens when we cease to drive BSY - looks
1483 * like the board/chip is letting us do another read before the
1484 * appropriate propagation delay has expired, and we're confusing
1485 * a BSY signal from ourselves as the target's response to SELECTION.
1487 * A small delay (the 'C++' frontend breaks the pipeline with an
1488 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1489 * tighter 'C' code breaks and requires this) solves the problem -
1490 * the 1 us delay is arbitrary, and only used because this delay will
1491 * be the same on other platforms and since it works here, it should
1494 * wingel suggests that this could be due to failing to wait
1500 dprintk(NDEBUG_SELECTION
, "scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1503 * The SCSI specification calls for a 250 ms timeout for the actual
1507 timeout
= jiffies
+ 25;
1510 * XXX very interesting - we're seeing a bounce where the BSY we
1511 * asserted is being reflected / still asserted (propagation delay?)
1512 * and it's detecting as true. Sigh.
1516 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1517 * IO while SEL is true. But again, there are some disks out the in the
1518 * world that do that nevertheless. (Somebody claimed that this announces
1519 * reselection capability of the target.) So we better skip that test and
1520 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1523 while (time_before(jiffies
, timeout
) &&
1524 !(NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_IO
)))
1527 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1528 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1529 NCR5380_reselect(instance
);
1530 printk(KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1532 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1536 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) & SR_BSY
))
1541 * No less than two deskew delays after the initiator detects the
1542 * BSY signal is true, it shall release the SEL signal and may
1543 * change the DATA BUS. -wingel
1548 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1550 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1551 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1552 if (hostdata
->targets_present
& (1 << cmd
->device
->id
)) {
1553 printk(KERN_ERR
"scsi%d: weirdness\n", HOSTNO
);
1554 if (hostdata
->restart_select
)
1555 printk(KERN_NOTICE
"\trestart select\n");
1556 NCR5380_dprint(NDEBUG_ANY
, instance
);
1557 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1560 cmd
->result
= DID_BAD_TARGET
<< 16;
1564 cmd
->scsi_done(cmd
);
1565 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1566 dprintk(NDEBUG_SELECTION
, "scsi%d: target did not respond within 250ms\n", HOSTNO
);
1567 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1571 hostdata
->targets_present
|= (1 << cmd
->device
->id
);
1574 * Since we followed the SCSI spec, and raised ATN while SEL
1575 * was true but before BSY was false during selection, the information
1576 * transfer phase should be a MESSAGE OUT phase so that we can send the
1579 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1580 * message (2 bytes) with a tag ID that we increment with every command
1581 * until it wraps back to 0.
1583 * XXX - it turns out that there are some broken SCSI-II devices,
1584 * which claim to support tagged queuing but fail when more than
1585 * some number of commands are issued at once.
1588 /* Wait for start of REQ/ACK handshake */
1589 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
1592 dprintk(NDEBUG_SELECTION
, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1593 HOSTNO
, cmd
->device
->id
);
1594 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1597 if (cmd
->tag
!= TAG_NONE
) {
1598 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1606 #endif /* SUPPORT_TAGS */
1608 /* Send message(s) */
1610 phase
= PHASE_MSGOUT
;
1611 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1612 dprintk(NDEBUG_SELECTION
, "scsi%d: nexus established.\n", HOSTNO
);
1613 /* XXX need to handle errors here */
1614 hostdata
->connected
= cmd
;
1615 #ifndef SUPPORT_TAGS
1616 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1619 initialize_SCp(cmd
);
1625 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1626 * unsigned char *phase, int *count, unsigned char **data)
1628 * Purpose : transfers data in given phase using polled I/O
1630 * Inputs : instance - instance of driver, *phase - pointer to
1631 * what phase is expected, *count - pointer to number of
1632 * bytes to transfer, **data - pointer to data pointer.
1634 * Returns : -1 when different phase is entered without transferring
1635 * maximum number of bytes, 0 if all bytes are transferred or exit
1638 * Also, *phase, *count, *data are modified in place.
1640 * XXX Note : handling for bus free may be useful.
1644 * Note : this code is not as quick as it could be, however it
1645 * IS 100% reliable, and for the actual data transfer where speed
1646 * counts, we will always do a pseudo DMA or DMA transfer.
1649 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1650 unsigned char *phase
, int *count
,
1651 unsigned char **data
)
1653 register unsigned char p
= *phase
, tmp
;
1654 register int c
= *count
;
1655 register unsigned char *d
= *data
;
1658 * The NCR5380 chip will only drive the SCSI bus when the
1659 * phase specified in the appropriate bits of the TARGET COMMAND
1660 * REGISTER match the STATUS REGISTER
1663 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1667 * Wait for assertion of REQ, after which the phase bits will be
1670 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
))
1673 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: REQ detected\n", HOSTNO
);
1675 /* Check for phase mismatch */
1676 if ((tmp
& PHASE_MASK
) != p
) {
1677 dprintk(NDEBUG_PIO
, "scsi%d: phase mismatch\n", HOSTNO
);
1678 NCR5380_dprint_phase(NDEBUG_PIO
, instance
);
1682 /* Do actual transfer from SCSI bus to / from memory */
1684 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1686 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1691 * The SCSI standard suggests that in MSGOUT phase, the initiator
1692 * should drop ATN on the last byte of the message phase
1693 * after REQ has been asserted for the handshake but before
1694 * the initiator raises ACK.
1698 if (!((p
& SR_MSG
) && c
> 1)) {
1699 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1700 NCR5380_dprint(NDEBUG_PIO
, instance
);
1701 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1702 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1704 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1705 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1706 NCR5380_dprint(NDEBUG_PIO
, instance
);
1707 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1708 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1711 NCR5380_dprint(NDEBUG_PIO
, instance
);
1712 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1715 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1718 dprintk(NDEBUG_HANDSHAKE
, "scsi%d: req false, handshake complete\n", HOSTNO
);
1721 * We have several special cases to consider during REQ/ACK handshaking :
1722 * 1. We were in MSGOUT phase, and we are on the last byte of the
1723 * message. ATN must be dropped as ACK is dropped.
1725 * 2. We are in a MSGIN phase, and we are on the last byte of the
1726 * message. We must exit with ACK asserted, so that the calling
1727 * code may raise ATN before dropping ACK to reject the message.
1729 * 3. ACK and ATN are clear and the target may proceed as normal.
1731 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1732 if (p
== PHASE_MSGOUT
&& c
> 1)
1733 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1735 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1739 dprintk(NDEBUG_PIO
, "scsi%d: residual %d\n", HOSTNO
, c
);
1743 tmp
= NCR5380_read(STATUS_REG
);
1744 /* The phase read from the bus is valid if either REQ is (already)
1745 * asserted or if ACK hasn't been released yet. The latter is the case if
1746 * we're in MSGIN and all wanted bytes have been received.
1748 if ((tmp
& SR_REQ
) || (p
== PHASE_MSGIN
&& c
== 0))
1749 *phase
= tmp
& PHASE_MASK
;
1751 *phase
= PHASE_UNKNOWN
;
1753 if (!c
|| (*phase
== p
))
1760 * Function : do_abort (Scsi_Host *host)
1762 * Purpose : abort the currently established nexus. Should only be
1763 * called from a routine which can drop into a
1765 * Returns : 0 on success, -1 on failure.
1768 static int do_abort(struct Scsi_Host
*host
)
1770 unsigned char tmp
, *msgptr
, phase
;
1773 /* Request message out phase */
1774 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1777 * Wait for the target to indicate a valid phase by asserting
1778 * REQ. Once this happens, we'll have either a MSGOUT phase
1779 * and can immediately send the ABORT message, or we'll have some
1780 * other phase and will have to source/sink data.
1782 * We really don't care what value was on the bus or what value
1783 * the target sees, so we just handshake.
1786 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
))
1789 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1791 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
1792 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1794 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1796 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1802 phase
= PHASE_MSGOUT
;
1803 NCR5380_transfer_pio(host
, &phase
, &len
, &msgptr
);
1806 * If we got here, and the command completed successfully,
1807 * we're about to go into bus free state.
1810 return len
? -1 : 0;
1813 #if defined(REAL_DMA)
1815 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1816 * unsigned char *phase, int *count, unsigned char **data)
1818 * Purpose : transfers data in given phase using either real
1821 * Inputs : instance - instance of driver, *phase - pointer to
1822 * what phase is expected, *count - pointer to number of
1823 * bytes to transfer, **data - pointer to data pointer.
1825 * Returns : -1 when different phase is entered without transferring
1826 * maximum number of bytes, 0 if all bytes or transferred or exit
1829 * Also, *phase, *count, *data are modified in place.
1834 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1835 unsigned char *phase
, int *count
,
1836 unsigned char **data
)
1838 SETUP_HOSTDATA(instance
);
1839 register int c
= *count
;
1840 register unsigned char p
= *phase
;
1841 register unsigned char *d
= *data
;
1843 unsigned long flags
;
1845 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1850 if (atari_read_overruns
&& (p
& SR_IO
))
1851 c
-= atari_read_overruns
;
1853 dprintk(NDEBUG_DMA
, "scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1854 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1855 c
, (p
& SR_IO
) ? "to" : "from", d
);
1857 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1860 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
1861 #endif /* def REAL_DMA */
1864 /* On the Medusa, it is a must to initialize the DMA before
1865 * starting the NCR. This is also the cleaner way for the TT.
1867 local_irq_save(flags
);
1868 hostdata
->dma_len
= (p
& SR_IO
) ?
1869 NCR5380_dma_read_setup(instance
, d
, c
) :
1870 NCR5380_dma_write_setup(instance
, d
, c
);
1871 local_irq_restore(flags
);
1875 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1877 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1878 NCR5380_write(START_DMA_SEND_REG
, 0);
1882 /* On the Falcon, the DMA setup must be done after the last */
1883 /* NCR access, else the DMA setup gets trashed!
1885 local_irq_save(flags
);
1886 hostdata
->dma_len
= (p
& SR_IO
) ?
1887 NCR5380_dma_read_setup(instance
, d
, c
) :
1888 NCR5380_dma_write_setup(instance
, d
, c
);
1889 local_irq_restore(flags
);
1893 #endif /* defined(REAL_DMA) */
1896 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1898 * Purpose : run through the various SCSI phases and do as the target
1899 * directs us to. Operates on the currently connected command,
1900 * instance->connected.
1902 * Inputs : instance, instance for which we are doing commands
1904 * Side effects : SCSI things happen, the disconnected queue will be
1905 * modified if a command disconnects, *instance->connected will
1908 * XXX Note : we need to watch for bus free or a reset condition here
1909 * to recover from an unexpected bus free condition.
1912 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
1914 SETUP_HOSTDATA(instance
);
1915 unsigned long flags
;
1916 unsigned char msgout
= NOP
;
1919 #if defined(REAL_DMA)
1922 unsigned char *data
;
1923 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
1924 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
1927 tmp
= NCR5380_read(STATUS_REG
);
1928 /* We only have a valid SCSI phase when REQ is asserted */
1930 phase
= (tmp
& PHASE_MASK
);
1931 if (phase
!= old_phase
) {
1933 NCR5380_dprint_phase(NDEBUG_INFORMATION
, instance
);
1936 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
1937 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1939 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1941 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1943 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1951 #if (NDEBUG & NDEBUG_NO_DATAOUT)
1952 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
1953 "aborted\n", HOSTNO
);
1956 cmd
->result
= DID_ERROR
<< 16;
1957 cmd
->scsi_done(cmd
);
1962 * If there is no room left in the current buffer in the
1963 * scatter-gather list, move onto the next one.
1966 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
1968 --cmd
->SCp
.buffers_residual
;
1969 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
1970 cmd
->SCp
.ptr
= sg_virt(cmd
->SCp
.buffer
);
1971 /* ++roman: Try to merge some scatter-buffers if
1972 * they are at contiguous physical addresses.
1974 merge_contiguous_buffers(cmd
);
1975 dprintk(NDEBUG_INFORMATION
, "scsi%d: %d bytes and %d buffers left\n",
1976 HOSTNO
, cmd
->SCp
.this_residual
,
1977 cmd
->SCp
.buffers_residual
);
1981 * The preferred transfer method is going to be
1982 * PSEUDO-DMA for systems that are strictly PIO,
1983 * since we can let the hardware do the handshaking.
1985 * For this to work, we need to know the transfersize
1986 * ahead of time, since the pseudo-DMA code will sit
1987 * in an unconditional loop.
1990 /* ++roman: I suggest, this should be
1992 * instead of leaving REAL_DMA out.
1995 #if defined(REAL_DMA)
1996 if (!cmd
->device
->borken
&&
1997 (transfersize
= NCR5380_dma_xfer_len(instance
,cmd
,phase
)) > 31) {
1999 cmd
->SCp
.phase
= phase
;
2000 if (NCR5380_transfer_dma(instance
, &phase
,
2001 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
2003 * If the watchdog timer fires, all future
2004 * accesses to this device will use the
2006 printk(KERN_NOTICE
"scsi%d: switching target %d "
2007 "lun %llu to slow handshake\n", HOSTNO
,
2008 cmd
->device
->id
, cmd
->device
->lun
);
2009 cmd
->device
->borken
= 1;
2010 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2014 cmd
->result
= DID_ERROR
<< 16;
2015 cmd
->scsi_done(cmd
);
2016 /* XXX - need to source or sink data here, as appropriate */
2019 /* ++roman: When using real DMA,
2020 * information_transfer() should return after
2021 * starting DMA since it has nothing more to
2026 cmd
->SCp
.this_residual
-= transfersize
- len
;
2030 #endif /* defined(REAL_DMA) */
2031 NCR5380_transfer_pio(instance
, &phase
,
2032 (int *)&cmd
->SCp
.this_residual
,
2033 (unsigned char **)&cmd
->SCp
.ptr
);
2038 NCR5380_write(SELECT_ENABLE_REG
, 0); /* disable reselects */
2039 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2040 cmd
->SCp
.Message
= tmp
;
2044 * Linking lets us reduce the time required to get the
2045 * next command out to the device, hopefully this will
2046 * mean we don't waste another revolution due to the delays
2047 * required by ARBITRATION and another SELECTION.
2049 * In the current implementation proposal, low level drivers
2050 * merely have to start the next command, pointed to by
2051 * next_link, done() is called as with unlinked commands.
2054 case LINKED_CMD_COMPLETE
:
2055 case LINKED_FLG_CMD_COMPLETE
:
2056 /* Accept message by clearing ACK */
2057 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2059 dprintk(NDEBUG_LINKED
, "scsi%d: target %d lun %llu linked command "
2060 "complete.\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2062 /* Enable reselect interrupts */
2063 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2065 * Sanity check : A linked command should only terminate
2066 * with one of these messages if there are more linked
2067 * commands available.
2070 if (!cmd
->next_link
) {
2071 printk(KERN_NOTICE
"scsi%d: target %d lun %llu "
2072 "linked command complete, no next_link\n",
2073 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2079 initialize_SCp(cmd
->next_link
);
2080 /* The next command is still part of this process; copy it
2081 * and don't free it! */
2082 cmd
->next_link
->tag
= cmd
->tag
;
2083 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2084 dprintk(NDEBUG_LINKED
, "scsi%d: target %d lun %llu linked request "
2085 "done, calling scsi_done().\n",
2086 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2087 cmd
->scsi_done(cmd
);
2088 cmd
= hostdata
->connected
;
2090 #endif /* def LINKED */
2092 case COMMAND_COMPLETE
:
2093 /* Accept message by clearing ACK */
2094 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2095 /* ++guenther: possible race with Falcon locking */
2096 falcon_dont_release
++;
2097 hostdata
->connected
= NULL
;
2098 dprintk(NDEBUG_QUEUES
, "scsi%d: command for target %d, lun %llu "
2099 "completed\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2102 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2103 /* Turn a QUEUE FULL status into BUSY, I think the
2104 * mid level cannot handle QUEUE FULL :-( (The
2105 * command is retried after BUSY). Also update our
2106 * queue size to the number of currently issued
2109 /* ++Andreas: the mid level code knows about
2111 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
];
2112 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu returned "
2113 "QUEUE_FULL after %d commands\n",
2114 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2116 if (ta
->queue_size
> ta
->nr_allocated
)
2117 ta
->nr_allocated
= ta
->queue_size
;
2120 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2122 /* Enable reselect interrupts */
2123 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2126 * I'm not sure what the correct thing to do here is :
2128 * If the command that just executed is NOT a request
2129 * sense, the obvious thing to do is to set the result
2130 * code to the values of the stored parameters.
2132 * If it was a REQUEST SENSE command, we need some way to
2133 * differentiate between the failure code of the original
2134 * and the failure code of the REQUEST sense - the obvious
2135 * case is success, where we fall through and leave the
2136 * result code unchanged.
2138 * The non-obvious place is where the REQUEST SENSE failed
2141 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2142 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2143 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2144 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2146 if ((cmd
->cmnd
[0] == REQUEST_SENSE
) &&
2147 hostdata
->ses
.cmd_len
) {
2148 scsi_eh_restore_cmnd(cmd
, &hostdata
->ses
);
2149 hostdata
->ses
.cmd_len
= 0 ;
2152 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2153 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2154 scsi_eh_prep_cmnd(cmd
, &hostdata
->ses
, NULL
, 0, ~0);
2156 dprintk(NDEBUG_AUTOSENSE
, "scsi%d: performing request sense\n", HOSTNO
);
2158 local_irq_save(flags
);
2159 LIST(cmd
,hostdata
->issue_queue
);
2160 SET_NEXT(cmd
, hostdata
->issue_queue
);
2161 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
2162 local_irq_restore(flags
);
2163 dprintk(NDEBUG_QUEUES
, "scsi%d: REQUEST SENSE added to head of "
2164 "issue queue\n", H_NO(cmd
));
2166 cmd
->scsi_done(cmd
);
2169 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2171 * Restore phase bits to 0 so an interrupted selection,
2172 * arbitration can resume.
2174 NCR5380_write(TARGET_COMMAND_REG
, 0);
2176 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2179 falcon_dont_release
--;
2180 /* ++roman: For Falcon SCSI, release the lock on the
2181 * ST-DMA here if no other commands are waiting on the
2182 * disconnected queue.
2184 falcon_release_lock_if_possible(hostdata
);
2186 case MESSAGE_REJECT
:
2187 /* Accept message by clearing ACK */
2188 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2189 /* Enable reselect interrupts */
2190 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2191 switch (hostdata
->last_message
) {
2192 case HEAD_OF_QUEUE_TAG
:
2193 case ORDERED_QUEUE_TAG
:
2194 case SIMPLE_QUEUE_TAG
:
2195 /* The target obviously doesn't support tagged
2196 * queuing, even though it announced this ability in
2197 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2198 * clear 'tagged_supported' and lock the LUN, since
2199 * the command is treated as untagged further on.
2201 cmd
->device
->tagged_supported
= 0;
2202 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2203 cmd
->tag
= TAG_NONE
;
2204 dprintk(NDEBUG_TAGS
, "scsi%d: target %d lun %llu rejected "
2205 "QUEUE_TAG message; tagged queuing "
2207 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2212 /* Accept message by clearing ACK */
2213 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2214 local_irq_save(flags
);
2215 cmd
->device
->disconnect
= 1;
2216 LIST(cmd
,hostdata
->disconnected_queue
);
2217 SET_NEXT(cmd
, hostdata
->disconnected_queue
);
2218 hostdata
->connected
= NULL
;
2219 hostdata
->disconnected_queue
= cmd
;
2220 local_irq_restore(flags
);
2221 dprintk(NDEBUG_QUEUES
, "scsi%d: command for target %d lun %llu was "
2222 "moved from connected to the "
2223 "disconnected_queue\n", HOSTNO
,
2224 cmd
->device
->id
, cmd
->device
->lun
);
2226 * Restore phase bits to 0 so an interrupted selection,
2227 * arbitration can resume.
2229 NCR5380_write(TARGET_COMMAND_REG
, 0);
2231 /* Enable reselect interrupts */
2232 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2233 /* Wait for bus free to avoid nasty timeouts */
2234 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2238 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2239 * operation, in violation of the SCSI spec so we can safely
2240 * ignore SAVE/RESTORE pointers calls.
2242 * Unfortunately, some disks violate the SCSI spec and
2243 * don't issue the required SAVE_POINTERS message before
2244 * disconnecting, and we have to break spec to remain
2248 case RESTORE_POINTERS
:
2249 /* Accept message by clearing ACK */
2250 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2251 /* Enable reselect interrupts */
2252 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2254 case EXTENDED_MESSAGE
:
2256 * Extended messages are sent in the following format :
2258 * 0 EXTENDED_MESSAGE == 1
2259 * 1 length (includes one byte for code, doesn't
2260 * include first two bytes)
2262 * 3..length+1 arguments
2264 * Start the extended message buffer with the EXTENDED_MESSAGE
2265 * byte, since spi_print_msg() wants the whole thing.
2267 extended_msg
[0] = EXTENDED_MESSAGE
;
2268 /* Accept first byte by clearing ACK */
2269 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2271 dprintk(NDEBUG_EXTENDED
, "scsi%d: receiving extended message\n", HOSTNO
);
2274 data
= extended_msg
+ 1;
2275 phase
= PHASE_MSGIN
;
2276 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2277 dprintk(NDEBUG_EXTENDED
, "scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2278 (int)extended_msg
[1], (int)extended_msg
[2]);
2280 if (!len
&& extended_msg
[1] <=
2281 (sizeof(extended_msg
) - 1)) {
2282 /* Accept third byte by clearing ACK */
2283 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2284 len
= extended_msg
[1] - 1;
2285 data
= extended_msg
+ 3;
2286 phase
= PHASE_MSGIN
;
2288 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2289 dprintk(NDEBUG_EXTENDED
, "scsi%d: message received, residual %d\n",
2292 switch (extended_msg
[2]) {
2295 case EXTENDED_MODIFY_DATA_POINTER
:
2296 case EXTENDED_EXTENDED_IDENTIFY
:
2300 printk(KERN_NOTICE
"scsi%d: error receiving "
2301 "extended message\n", HOSTNO
);
2304 printk(KERN_NOTICE
"scsi%d: extended message "
2305 "code %02x length %d is too long\n",
2306 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2309 /* Fall through to reject message */
2312 * If we get something weird that we aren't expecting,
2317 printk(KERN_DEBUG
"scsi%d: rejecting message ", HOSTNO
);
2318 spi_print_msg(extended_msg
);
2320 } else if (tmp
!= EXTENDED_MESSAGE
)
2321 printk(KERN_DEBUG
"scsi%d: rejecting unknown "
2322 "message %02x from target %d, lun %llu\n",
2323 HOSTNO
, tmp
, cmd
->device
->id
, cmd
->device
->lun
);
2325 printk(KERN_DEBUG
"scsi%d: rejecting unknown "
2327 "code %02x, length %d from target %d, lun %llu\n",
2328 HOSTNO
, extended_msg
[1], extended_msg
[0],
2329 cmd
->device
->id
, cmd
->device
->lun
);
2332 msgout
= MESSAGE_REJECT
;
2333 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2335 } /* switch (tmp) */
2340 hostdata
->last_message
= msgout
;
2341 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2342 if (msgout
== ABORT
) {
2346 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2348 hostdata
->connected
= NULL
;
2349 cmd
->result
= DID_ERROR
<< 16;
2350 cmd
->scsi_done(cmd
);
2351 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2352 falcon_release_lock_if_possible(hostdata
);
2361 * XXX for performance reasons, on machines with a
2362 * PSEUDO-DMA architecture we should probably
2363 * use the dma transfer function.
2365 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2370 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2371 cmd
->SCp
.Status
= tmp
;
2374 printk("scsi%d: unknown phase\n", HOSTNO
);
2375 NCR5380_dprint(NDEBUG_ANY
, instance
);
2376 } /* switch(phase) */
2377 } /* if (tmp * SR_REQ) */
2382 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2384 * Purpose : does reselection, initializing the instance->connected
2385 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2386 * nexus has been reestablished,
2388 * Inputs : instance - this instance of the NCR5380.
2393 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2395 SETUP_HOSTDATA(instance
);
2396 unsigned char target_mask
;
2397 unsigned char lun
, phase
;
2402 unsigned char msg
[3];
2403 unsigned char *data
;
2404 Scsi_Cmnd
*tmp
= NULL
, *prev
;
2405 /* unsigned long flags; */
2408 * Disable arbitration, etc. since the host adapter obviously
2409 * lost, and tell an interrupted NCR5380_select() to restart.
2412 NCR5380_write(MODE_REG
, MR_BASE
);
2413 hostdata
->restart_select
= 1;
2415 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2417 dprintk(NDEBUG_RESELECTION
, "scsi%d: reselect\n", HOSTNO
);
2420 * At this point, we have detected that our SCSI ID is on the bus,
2421 * SEL is true and BSY was false for at least one bus settle delay
2424 * We must assert BSY ourselves, until the target drops the SEL
2428 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2430 while (NCR5380_read(STATUS_REG
) & SR_SEL
)
2432 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2435 * Wait for target to go into MSGIN.
2438 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
2443 phase
= PHASE_MSGIN
;
2444 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2446 if (!(msg
[0] & 0x80)) {
2447 printk(KERN_DEBUG
"scsi%d: expecting IDENTIFY message, got ", HOSTNO
);
2452 lun
= (msg
[0] & 0x07);
2455 /* If the phase is still MSGIN, the target wants to send some more
2456 * messages. In case it supports tagged queuing, this is probably a
2457 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2460 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2461 /* Accept previous IDENTIFY message by clearing ACK */
2462 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2465 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2466 msg
[1] == SIMPLE_QUEUE_TAG
)
2468 dprintk(NDEBUG_TAGS
, "scsi%d: target mask %02x, lun %d sent tag %d at "
2469 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2474 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2475 * just reestablished, and remove it from the disconnected queue.
2478 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2479 tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
2480 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== tmp
->device
->lun
)
2482 && (tag
== tmp
->tag
)
2485 /* ++guenther: prevent race with falcon_release_lock */
2486 falcon_dont_release
++;
2488 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
2489 SET_NEXT(prev
, NEXT(tmp
));
2491 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, NEXT(tmp
));
2492 hostdata
->disconnected_queue
= NEXT(tmp
);
2494 SET_NEXT(tmp
, NULL
);
2500 printk(KERN_WARNING
"scsi%d: warning: target bitmask %02x lun %d "
2504 "not in disconnected_queue.\n",
2505 HOSTNO
, target_mask
, lun
2511 * Since we have an established nexus that we can't do anything
2512 * with, we must abort it.
2518 /* Accept message by clearing ACK */
2519 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2521 hostdata
->connected
= tmp
;
2522 dprintk(NDEBUG_RESELECTION
, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n",
2523 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
, tmp
->tag
);
2524 falcon_dont_release
--;
2529 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2531 * Purpose : abort a command
2533 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2534 * host byte of the result field to, if zero DID_ABORTED is
2537 * Returns : SUCCESS - success, FAILED on failure.
2539 * XXX - there is no way to abort the command that is currently
2540 * connected, you have to wait for it to complete. If this is
2541 * a problem, we could implement longjmp() / setjmp(), setjmp()
2542 * called where the loop started in NCR5380_main().
2546 int NCR5380_abort(Scsi_Cmnd
*cmd
)
2548 struct Scsi_Host
*instance
= cmd
->device
->host
;
2549 SETUP_HOSTDATA(instance
);
2550 Scsi_Cmnd
*tmp
, **prev
;
2551 unsigned long flags
;
2553 scmd_printk(KERN_NOTICE
, cmd
, "aborting command\n");
2555 NCR5380_print_status(instance
);
2557 local_irq_save(flags
);
2559 if (!IS_A_TT() && !falcon_got_lock
)
2560 printk(KERN_ERR
"scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2563 dprintk(NDEBUG_ABORT
, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2564 NCR5380_read(BUS_AND_STATUS_REG
),
2565 NCR5380_read(STATUS_REG
));
2569 * Case 1 : If the command is the currently executing command,
2570 * we'll set the aborted flag and return control so that
2571 * information transfer routine can exit cleanly.
2574 if (hostdata
->connected
== cmd
) {
2576 dprintk(NDEBUG_ABORT
, "scsi%d: aborting connected command\n", HOSTNO
);
2578 * We should perform BSY checking, and make sure we haven't slipped
2582 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2584 * Since we can't change phases until we've completed the current
2585 * handshake, we have to source or sink a byte of data if the current
2586 * phase is not MSGOUT.
2590 * Return control to the executing NCR drive so we can clear the
2591 * aborted flag and get back into our main loop.
2594 if (do_abort(instance
) == 0) {
2595 hostdata
->aborted
= 1;
2596 hostdata
->connected
= NULL
;
2597 cmd
->result
= DID_ABORT
<< 16;
2601 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2603 local_irq_restore(flags
);
2604 cmd
->scsi_done(cmd
);
2605 falcon_release_lock_if_possible(hostdata
);
2608 /* local_irq_restore(flags); */
2609 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2616 * Case 2 : If the command hasn't been issued yet, we simply remove it
2617 * from the issue queue.
2619 for (prev
= (Scsi_Cmnd
**)&(hostdata
->issue_queue
),
2620 tmp
= (Scsi_Cmnd
*)hostdata
->issue_queue
;
2621 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2623 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2624 (*prev
) = NEXT(tmp
);
2625 SET_NEXT(tmp
, NULL
);
2626 tmp
->result
= DID_ABORT
<< 16;
2627 local_irq_restore(flags
);
2628 dprintk(NDEBUG_ABORT
, "scsi%d: abort removed command from issue queue.\n",
2630 /* Tagged queuing note: no tag to free here, hasn't been assigned
2632 tmp
->scsi_done(tmp
);
2633 falcon_release_lock_if_possible(hostdata
);
2639 * Case 3 : If any commands are connected, we're going to fail the abort
2640 * and let the high level SCSI driver retry at a later time or
2643 * Timeouts, and therefore aborted commands, will be highly unlikely
2644 * and handling them cleanly in this situation would make the common
2645 * case of noresets less efficient, and would pollute our code. So,
2649 if (hostdata
->connected
) {
2650 local_irq_restore(flags
);
2651 dprintk(NDEBUG_ABORT
, "scsi%d: abort failed, command connected.\n", HOSTNO
);
2656 * Case 4: If the command is currently disconnected from the bus, and
2657 * there are no connected commands, we reconnect the I_T_L or
2658 * I_T_L_Q nexus associated with it, go into message out, and send
2661 * This case is especially ugly. In order to reestablish the nexus, we
2662 * need to call NCR5380_select(). The easiest way to implement this
2663 * function was to abort if the bus was busy, and let the interrupt
2664 * handler triggered on the SEL for reselect take care of lost arbitrations
2665 * where necessary, meaning interrupts need to be enabled.
2667 * When interrupts are enabled, the queues may change - so we
2668 * can't remove it from the disconnected queue before selecting it
2669 * because that could cause a failure in hashing the nexus if that
2670 * device reselected.
2672 * Since the queues may change, we can't use the pointers from when we
2675 * So, we must first locate the command, and if NCR5380_select()
2676 * succeeds, then issue the abort, relocate the command and remove
2677 * it from the disconnected queue.
2680 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
;
2683 local_irq_restore(flags
);
2684 dprintk(NDEBUG_ABORT
, "scsi%d: aborting disconnected command.\n", HOSTNO
);
2686 if (NCR5380_select(instance
, cmd
))
2689 dprintk(NDEBUG_ABORT
, "scsi%d: nexus reestablished.\n", HOSTNO
);
2693 local_irq_save(flags
);
2694 for (prev
= (Scsi_Cmnd
**)&(hostdata
->disconnected_queue
),
2695 tmp
= (Scsi_Cmnd
*)hostdata
->disconnected_queue
;
2696 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2698 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2700 SET_NEXT(tmp
, NULL
);
2701 tmp
->result
= DID_ABORT
<< 16;
2702 /* We must unlock the tag/LUN immediately here, since the
2703 * target goes to BUS FREE and doesn't send us another
2704 * message (COMMAND_COMPLETE or the like)
2709 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2711 local_irq_restore(flags
);
2712 tmp
->scsi_done(tmp
);
2713 falcon_release_lock_if_possible(hostdata
);
2721 * Case 5 : If we reached this point, the command was not found in any of
2724 * We probably reached this point because of an unlikely race condition
2725 * between the command completing successfully and the abortion code,
2726 * so we won't panic, but we will notify the user in case something really
2730 local_irq_restore(flags
);
2731 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO
);
2733 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2734 * possible at all) At least, we should check if the lock could be
2735 * released after the abort, in case it is kept due to some bug.
2737 falcon_release_lock_if_possible(hostdata
);
2744 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
2746 * Purpose : reset the SCSI bus.
2748 * Returns : SUCCESS or FAILURE
2752 static int NCR5380_bus_reset(Scsi_Cmnd
*cmd
)
2754 SETUP_HOSTDATA(cmd
->device
->host
);
2756 unsigned long flags
;
2757 #if defined(RESET_RUN_DONE)
2758 Scsi_Cmnd
*connected
, *disconnected_queue
;
2761 if (!IS_A_TT() && !falcon_got_lock
)
2762 printk(KERN_ERR
"scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2765 NCR5380_print_status(cmd
->device
->host
);
2768 NCR5380_write(TARGET_COMMAND_REG
,
2769 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
)));
2771 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
2773 /* reset NCR registers */
2774 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2775 NCR5380_write(MODE_REG
, MR_BASE
);
2776 NCR5380_write(TARGET_COMMAND_REG
, 0);
2777 NCR5380_write(SELECT_ENABLE_REG
, 0);
2778 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2779 * through anymore ... */
2780 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
2782 /* MSch 20140115 - looking at the generic NCR5380 driver, all of this
2784 * Catch-22: if we don't clear all queues, the SCSI driver lock will
2785 * not be reset by atari_scsi_reset()!
2788 #if defined(RESET_RUN_DONE)
2789 /* XXX Should now be done by midlevel code, but it's broken XXX */
2790 /* XXX see below XXX */
2792 /* MSch: old-style reset: actually abort all command processing here */
2794 /* After the reset, there are no more connected or disconnected commands
2795 * and no busy units; to avoid problems with re-inserting the commands
2796 * into the issue_queue (via scsi_done()), the aborted commands are
2797 * remembered in local variables first.
2799 local_irq_save(flags
);
2800 connected
= (Scsi_Cmnd
*)hostdata
->connected
;
2801 hostdata
->connected
= NULL
;
2802 disconnected_queue
= (Scsi_Cmnd
*)hostdata
->disconnected_queue
;
2803 hostdata
->disconnected_queue
= NULL
;
2807 for (i
= 0; i
< 8; ++i
)
2808 hostdata
->busy
[i
] = 0;
2810 hostdata
->dma_len
= 0;
2812 local_irq_restore(flags
);
2814 /* In order to tell the mid-level code which commands were aborted,
2815 * set the command status to DID_RESET and call scsi_done() !!!
2816 * This ultimately aborts processing of these commands in the mid-level.
2819 if ((cmd
= connected
)) {
2820 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted a connected command\n", H_NO(cmd
));
2821 cmd
->result
= (cmd
->result
& 0xffff) | (DID_RESET
<< 16);
2822 cmd
->scsi_done(cmd
);
2825 for (i
= 0; (cmd
= disconnected_queue
); ++i
) {
2826 disconnected_queue
= NEXT(cmd
);
2827 SET_NEXT(cmd
, NULL
);
2828 cmd
->result
= (cmd
->result
& 0xffff) | (DID_RESET
<< 16);
2829 cmd
->scsi_done(cmd
);
2832 dprintk(NDEBUG_ABORT
, "scsi: reset aborted %d disconnected command(s)\n", i
);
2834 /* The Falcon lock should be released after a reset...
2836 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2837 * unlocking and enabling dma interrupt.
2839 /* falcon_release_lock_if_possible( hostdata );*/
2841 /* since all commands have been explicitly terminated, we need to tell
2842 * the midlevel code that the reset was SUCCESSFUL, and there is no
2843 * need to 'wake up' the commands by a request_sense
2848 /* MSch: new-style reset handling: let the mid-level do what it can */
2850 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2851 * Mid-level is supposed to requeue all commands that were active on the
2852 * various low-level queues. In fact it does this, but that's not enough
2853 * because all these commands are subject to timeout. And if a timeout
2854 * happens for any removed command, *_abort() is called but all queues
2855 * are now empty. Abort then gives up the falcon lock, which is fatal,
2856 * since the mid-level will queue more commands and must have the lock
2857 * (it's all happening inside timer interrupt handler!!).
2858 * Even worse, abort will return NOT_RUNNING for all those commands not
2859 * on any queue, so they won't be retried ...
2861 * Conclusion: either scsi.c disables timeout for all resetted commands
2862 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2865 /* After the reset, there are no more connected or disconnected commands
2866 * and no busy units; so clear the low-level status here to avoid
2867 * conflicts when the mid-level code tries to wake up the affected
2871 if (hostdata
->issue_queue
)
2872 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd
));
2873 if (hostdata
->connected
)
2874 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted a connected command\n", H_NO(cmd
));
2875 if (hostdata
->disconnected_queue
)
2876 dprintk(NDEBUG_ABORT
, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd
));
2878 local_irq_save(flags
);
2879 hostdata
->issue_queue
= NULL
;
2880 hostdata
->connected
= NULL
;
2881 hostdata
->disconnected_queue
= NULL
;
2885 for (i
= 0; i
< 8; ++i
)
2886 hostdata
->busy
[i
] = 0;
2888 hostdata
->dma_len
= 0;
2890 local_irq_restore(flags
);
2892 /* we did no complete reset of all commands, so a wakeup is required */