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 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
148 * number (updated for each public release) printed by the
149 * NCR5380_print_options command, which should be called from the
150 * wrapper detect function, so that I know what release of the driver
153 * Issues specific to the NCR5380 :
155 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
156 * piece of hardware that requires you to sit in a loop polling for
157 * the REQ signal as long as you are connected. Some devices are
158 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
159 * while doing long seek operations.
161 * The workaround for this is to keep track of devices that have
162 * disconnected. If the device hasn't disconnected, for commands that
163 * should disconnect, we do something like
165 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
167 * Some tweaking of N and M needs to be done. An algorithm based
168 * on "time to data" would give the best results as long as short time
169 * to datas (ie, on the same track) were considered, however these
170 * broken devices are the exception rather than the rule and I'd rather
171 * spend my time optimizing for the normal case.
175 * At the heart of the design is a coroutine, NCR5380_main,
176 * which is started when not running by the interrupt handler,
177 * timer, and queue command function. It attempts to establish
178 * I_T_L or I_T_L_Q nexuses by removing the commands from the
179 * issue queue and calling NCR5380_select() if a nexus
180 * is not established.
182 * Once a nexus is established, the NCR5380_information_transfer()
183 * phase goes through the various phases as instructed by the target.
184 * if the target goes into MSG IN and sends a DISCONNECT message,
185 * the command structure is placed into the per instance disconnected
186 * queue, and NCR5380_main tries to find more work. If USLEEP
187 * was defined, and the target is idle for too long, the system
190 * If a command has disconnected, eventually an interrupt will trigger,
191 * calling NCR5380_intr() which will in turn call NCR5380_reselect
192 * to reestablish a nexus. This will run main if necessary.
194 * On command termination, the done function will be called as
197 * SCSI pointers are maintained in the SCp field of SCSI command
198 * structures, being initialized after the command is connected
199 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
200 * Note that in violation of the standard, an implicit SAVE POINTERS operation
201 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
206 * This file a skeleton Linux SCSI driver for the NCR 5380 series
207 * of chips. To use it, you write an architecture specific functions
208 * and macros and include this file in your driver.
210 * These macros control options :
211 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
212 * for commands that return with a CHECK CONDITION status.
214 * LINKED - if defined, linked commands are supported.
216 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
218 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
220 * These macros MUST be defined :
222 * NCR5380_read(register) - read from the specified register
224 * NCR5380_write(register, value) - write to the specific register
226 * Either real DMA *or* pseudo DMA may be implemented
228 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
229 * Note that the DMA setup functions should return the number of bytes
230 * that they were able to program the controller for.
232 * Also note that generic i386/PC versions of these macros are
233 * available as NCR5380_i386_dma_write_setup,
234 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
236 * NCR5380_dma_write_setup(instance, src, count) - initialize
237 * NCR5380_dma_read_setup(instance, dst, count) - initialize
238 * NCR5380_dma_residual(instance); - residual count
241 * NCR5380_pwrite(instance, src, count)
242 * NCR5380_pread(instance, dst, count);
244 * If nothing specific to this implementation needs doing (ie, with external
245 * hardware), you must also define
247 * NCR5380_queue_command
252 * to be the global entry points into the specific driver, ie
253 * #define NCR5380_queue_command t128_queue_command.
255 * If this is not done, the routines will be defined as static functions
256 * with the NCR5380* names and the user must provide a globally
257 * accessible wrapper function.
259 * The generic driver is initialized by calling NCR5380_init(instance),
260 * after setting the appropriate host specific fields and ID. If the
261 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
262 * possible) function may be used. Before the specific driver initialization
263 * code finishes, NCR5380_print_options should be called.
266 static struct Scsi_Host
*first_instance
= NULL
;
267 static struct scsi_host_template
*the_template
= NULL
;
269 /* Macros ease life... :-) */
270 #define SETUP_HOSTDATA(in) \
271 struct NCR5380_hostdata *hostdata = \
272 (struct NCR5380_hostdata *)(in)->hostdata
273 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
275 #define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble)
276 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
277 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble)
279 #define HOSTNO instance->host_no
280 #define H_NO(cmd) (cmd)->device->host->host_no
285 * Functions for handling tagged queuing
286 * =====================================
288 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
290 * Using consecutive numbers for the tags is no good idea in my eyes. There
291 * could be wrong re-usings if the counter (8 bit!) wraps and some early
292 * command has been preempted for a long time. My solution: a bitfield for
293 * remembering used tags.
295 * There's also the problem that each target has a certain queue size, but we
296 * cannot know it in advance :-( We just see a QUEUE_FULL status being
297 * returned. So, in this case, the driver internal queue size assumption is
298 * reduced to the number of active tags if QUEUE_FULL is returned by the
299 * target. The command is returned to the mid-level, but with status changed
300 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
303 * We're also not allowed running tagged commands as long as an untagged
304 * command is active. And REQUEST SENSE commands after a contingent allegiance
305 * condition _must_ be untagged. To keep track whether an untagged command has
306 * been issued, the host->busy array is still employed, as it is without
307 * support for tagged queuing.
309 * One could suspect that there are possible race conditions between
310 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
311 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
312 * which already guaranteed to be running at most once. It is also the only
313 * place where tags/LUNs are allocated. So no other allocation can slip
314 * between that pair, there could only happen a reselection, which can free a
315 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
316 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
319 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
321 #define TAG_NONE 0xff
324 DECLARE_BITMAP(allocated
, MAX_TAGS
);
329 static TAG_ALLOC TagAlloc
[8][8]; /* 8 targets and 8 LUNs */
332 static void __init
init_tags(void)
337 if (!setup_use_tagged_queuing
)
340 for (target
= 0; target
< 8; ++target
) {
341 for (lun
= 0; lun
< 8; ++lun
) {
342 ta
= &TagAlloc
[target
][lun
];
343 bitmap_zero(ta
->allocated
, MAX_TAGS
);
344 ta
->nr_allocated
= 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
349 ta
->queue_size
= MAX_TAGS
;
355 /* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
362 static int is_lun_busy(Scsi_Cmnd
*cmd
, int should_be_tagged
)
364 SETUP_HOSTDATA(cmd
->device
->host
);
366 if (hostdata
->busy
[cmd
->device
->id
] & (1 << cmd
->device
->lun
))
368 if (!should_be_tagged
||
369 !setup_use_tagged_queuing
|| !cmd
->device
->tagged_supported
)
371 if (TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
].nr_allocated
>=
372 TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
].queue_size
) {
373 TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
381 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
386 static void cmd_get_tag(Scsi_Cmnd
*cmd
, int should_be_tagged
)
388 SETUP_HOSTDATA(cmd
->device
->host
);
390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
393 if (!should_be_tagged
||
394 !setup_use_tagged_queuing
|| !cmd
->device
->tagged_supported
) {
396 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
397 TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
400 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
];
402 cmd
->tag
= find_first_zero_bit(ta
->allocated
, MAX_TAGS
);
403 set_bit(cmd
->tag
, ta
->allocated
);
405 TAG_PRINTK("scsi%d: using tag %d for target %d lun %d "
406 "(now %d tags in use)\n",
407 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
,
408 cmd
->device
->lun
, ta
->nr_allocated
);
413 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
417 static void cmd_free_tag(Scsi_Cmnd
*cmd
)
419 SETUP_HOSTDATA(cmd
->device
->host
);
421 if (cmd
->tag
== TAG_NONE
) {
422 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
423 TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n",
424 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
425 } else if (cmd
->tag
>= MAX_TAGS
) {
426 printk(KERN_NOTICE
"scsi%d: trying to free bad tag %d!\n",
427 H_NO(cmd
), cmd
->tag
);
429 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
];
430 clear_bit(cmd
->tag
, ta
->allocated
);
432 TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n",
433 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
, cmd
->device
->lun
);
438 static void free_all_tags(void)
443 if (!setup_use_tagged_queuing
)
446 for (target
= 0; target
< 8; ++target
) {
447 for (lun
= 0; lun
< 8; ++lun
) {
448 ta
= &TagAlloc
[target
][lun
];
449 bitmap_zero(ta
->allocated
, MAX_TAGS
);
450 ta
->nr_allocated
= 0;
455 #endif /* SUPPORT_TAGS */
459 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
461 * Purpose: Try to merge several scatter-gather requests into one DMA
462 * transfer. This is possible if the scatter buffers lie on
463 * physical contiguous addresses.
465 * Parameters: Scsi_Cmnd *cmd
466 * The command to work on. The first scatter buffer's data are
467 * assumed to be already transfered into ptr/this_residual.
470 static void merge_contiguous_buffers(Scsi_Cmnd
*cmd
)
472 unsigned long endaddr
;
473 #if (NDEBUG & NDEBUG_MERGING)
474 unsigned long oldlen
= cmd
->SCp
.this_residual
;
478 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
479 cmd
->SCp
.buffers_residual
&&
480 virt_to_phys(page_address(cmd
->SCp
.buffer
[1].page
) +
481 cmd
->SCp
.buffer
[1].offset
) == endaddr
;) {
482 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
483 page_address(cmd
->SCp
.buffer
[1].page
), endaddr
);
484 #if (NDEBUG & NDEBUG_MERGING)
488 --cmd
->SCp
.buffers_residual
;
489 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
490 endaddr
+= cmd
->SCp
.buffer
->length
;
492 #if (NDEBUG & NDEBUG_MERGING)
493 if (oldlen
!= cmd
->SCp
.this_residual
)
494 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
495 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
500 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
502 * Purpose : initialize the saved data pointers for cmd to point to the
503 * start of the buffer.
505 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
508 static inline void initialize_SCp(Scsi_Cmnd
*cmd
)
511 * Initialize the Scsi Pointer field so that all of the commands in the
512 * various queues are valid.
516 cmd
->SCp
.buffer
= (struct scatterlist
*)cmd
->request_buffer
;
517 cmd
->SCp
.buffers_residual
= cmd
->use_sg
- 1;
518 cmd
->SCp
.ptr
= (char *)page_address(cmd
->SCp
.buffer
->page
) +
519 cmd
->SCp
.buffer
->offset
;
520 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
521 /* ++roman: Try to merge some scatter-buffers if they are at
522 * contiguous physical addresses.
524 merge_contiguous_buffers(cmd
);
526 cmd
->SCp
.buffer
= NULL
;
527 cmd
->SCp
.buffers_residual
= 0;
528 cmd
->SCp
.ptr
= (char *)cmd
->request_buffer
;
529 cmd
->SCp
.this_residual
= cmd
->request_bufflen
;
533 #include <linux/delay.h>
540 { SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
541 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
542 { SR_SEL
, "SEL" }, {0, NULL
}
544 {BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}
546 {ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
547 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
548 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
551 {MR_BLOCK_DMA_MODE
, "MODE BLOCK DMA"}, {MR_TARGET
, "MODE TARGET"},
552 {MR_ENABLE_PAR_CHECK
, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR
,
553 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR
,"MODE EOP INTR"},
554 {MR_MONITOR_BSY
, "MODE MONITOR BSY"},
555 {MR_DMA_MODE
, "MODE DMA"}, {MR_ARBITRATE
, "MODE ARBITRATION"},
560 * Function : void NCR5380_print(struct Scsi_Host *instance)
562 * Purpose : print the SCSI bus signals for debugging purposes
564 * Input : instance - which NCR5380
567 static void NCR5380_print(struct Scsi_Host
*instance
)
569 unsigned char status
, data
, basr
, mr
, icr
, i
;
572 local_irq_save(flags
);
573 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
574 status
= NCR5380_read(STATUS_REG
);
575 mr
= NCR5380_read(MODE_REG
);
576 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
577 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
578 local_irq_restore(flags
);
579 printk("STATUS_REG: %02x ", status
);
580 for (i
= 0; signals
[i
].mask
; ++i
)
581 if (status
& signals
[i
].mask
)
582 printk(",%s", signals
[i
].name
);
583 printk("\nBASR: %02x ", basr
);
584 for (i
= 0; basrs
[i
].mask
; ++i
)
585 if (basr
& basrs
[i
].mask
)
586 printk(",%s", basrs
[i
].name
);
587 printk("\nICR: %02x ", icr
);
588 for (i
= 0; icrs
[i
].mask
; ++i
)
589 if (icr
& icrs
[i
].mask
)
590 printk(",%s", icrs
[i
].name
);
591 printk("\nMODE: %02x ", mr
);
592 for (i
= 0; mrs
[i
].mask
; ++i
)
593 if (mr
& mrs
[i
].mask
)
594 printk(",%s", mrs
[i
].name
);
602 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
603 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
604 {PHASE_UNKNOWN
, "UNKNOWN"}
608 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
610 * Purpose : print the current SCSI phase for debugging purposes
612 * Input : instance - which NCR5380
615 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
617 unsigned char status
;
620 status
= NCR5380_read(STATUS_REG
);
621 if (!(status
& SR_REQ
))
622 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
624 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
625 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
)
627 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
634 static inline void NCR5380_print(struct Scsi_Host
*instance
)
637 static inline void NCR5380_print_phase(struct Scsi_Host
*instance
)
644 * ++roman: New scheme of calling NCR5380_main()
646 * If we're not in an interrupt, we can call our main directly, it cannot be
647 * already running. Else, we queue it on a task queue, if not 'main_running'
648 * tells us that a lower level is already executing it. This way,
649 * 'main_running' needs not be protected in a special way.
651 * queue_main() is a utility function for putting our main onto the task
652 * queue, if main_running is false. It should be called only from a
653 * interrupt or bottom half.
656 #include <linux/workqueue.h>
657 #include <linux/interrupt.h>
659 static volatile int main_running
;
660 static DECLARE_WORK(NCR5380_tqueue
, NCR5380_main
);
662 static inline void queue_main(void)
665 /* If in interrupt and NCR5380_main() not already running,
666 queue it on the 'immediate' task queue, to be processed
667 immediately after the current interrupt processing has
669 schedule_work(&NCR5380_tqueue
);
671 /* else: nothing to do: the running NCR5380_main() will pick up
672 any newly queued command. */
676 static inline void NCR5380_all_init(void)
680 INI_PRINTK("scsi : NCR5380_all_init()\n");
687 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
689 * Purpose : called by probe code indicating the NCR5380 driver
690 * options that were selected.
692 * Inputs : instance, pointer to this instance. Unused.
695 static void __init
NCR5380_print_options(struct Scsi_Host
*instance
)
697 printk(" generic options"
708 " SCSI-2 TAGGED QUEUING"
711 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE
);
715 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
717 * Purpose : print commands in the various queues, called from
718 * NCR5380_abort and NCR5380_debug to aid debugging.
720 * Inputs : instance, pointer to this instance.
723 static void NCR5380_print_status(struct Scsi_Host
*instance
)
729 NCR_PRINT(NDEBUG_ANY
);
730 NCR_PRINT_PHASE(NDEBUG_ANY
);
732 pr_bfr
= (char *)__get_free_page(GFP_ATOMIC
);
734 printk("NCR5380_print_status: no memory for print buffer\n");
737 len
= NCR5380_proc_info(instance
, pr_bfr
, &start
, 0, PAGE_SIZE
, 0);
739 printk("\n%s\n", pr_bfr
);
740 free_page((unsigned long)pr_bfr
);
744 /******************************************/
746 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
748 * *buffer: I/O buffer
749 * **start: if inout == FALSE pointer into buffer where user read should start
750 * offset: current offset
751 * length: length of buffer
752 * hostno: Scsi_Host host_no
753 * inout: TRUE - user is writing; FALSE - user is reading
755 * Return the number of bytes read from or written
759 #define SPRINTF(fmt,args...) \
761 if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
762 pos += sprintf(pos, fmt , ## args); \
764 static char *lprint_Scsi_Cmnd(Scsi_Cmnd
*cmd
, char *pos
, char *buffer
, int length
);
766 static int NCR5380_proc_info(struct Scsi_Host
*instance
, char *buffer
,
767 char **start
, off_t offset
, int length
, int inout
)
770 struct NCR5380_hostdata
*hostdata
;
774 #define check_offset() \
776 if (pos - buffer < offset - begin) { \
777 begin += pos - buffer; \
782 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
784 if (inout
) /* Has data been written to the file ? */
785 return -ENOSYS
; /* Currently this is a no-op */
786 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE
);
788 local_irq_save(flags
);
789 SPRINTF("NCR5380: coroutine is%s running.\n",
790 main_running
? "" : "n't");
792 if (!hostdata
->connected
)
793 SPRINTF("scsi%d: no currently connected command\n", HOSTNO
);
795 pos
= lprint_Scsi_Cmnd((Scsi_Cmnd
*) hostdata
->connected
,
796 pos
, buffer
, length
);
797 SPRINTF("scsi%d: issue_queue\n", HOSTNO
);
799 for (ptr
= (Scsi_Cmnd
*)hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
)) {
800 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
804 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO
);
806 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
;
808 pos
= lprint_Scsi_Cmnd(ptr
, pos
, buffer
, length
);
812 local_irq_restore(flags
);
813 *start
= buffer
+ (offset
- begin
);
814 if (pos
- buffer
< offset
- begin
)
816 else if (pos
- buffer
- (offset
- begin
) < length
)
817 return pos
- buffer
- (offset
- begin
);
821 static char *lprint_Scsi_Cmnd(Scsi_Cmnd
*cmd
, char *pos
, char *buffer
, int length
)
824 unsigned char *command
;
825 SPRINTF("scsi%d: destination target %d, lun %d\n",
826 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
827 SPRINTF(" command = ");
829 SPRINTF("%2d (0x%02x)", command
[0], command
[0]);
830 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
831 SPRINTF(" %02x", command
[i
]);
838 * Function : void NCR5380_init (struct Scsi_Host *instance)
840 * Purpose : initializes *instance and corresponding 5380 chip.
842 * Inputs : instance - instantiation of the 5380 driver.
844 * Notes : I assume that the host, hostno, and id bits have been
845 * set correctly. I don't care about the irq and other fields.
849 static int NCR5380_init(struct Scsi_Host
*instance
, int flags
)
852 SETUP_HOSTDATA(instance
);
856 hostdata
->aborted
= 0;
857 hostdata
->id_mask
= 1 << instance
->this_id
;
858 hostdata
->id_higher_mask
= 0;
859 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
860 if (i
> hostdata
->id_mask
)
861 hostdata
->id_higher_mask
|= i
;
862 for (i
= 0; i
< 8; ++i
)
863 hostdata
->busy
[i
] = 0;
867 #if defined (REAL_DMA)
868 hostdata
->dma_len
= 0;
870 hostdata
->targets_present
= 0;
871 hostdata
->connected
= NULL
;
872 hostdata
->issue_queue
= NULL
;
873 hostdata
->disconnected_queue
= NULL
;
874 hostdata
->flags
= FLAG_CHECK_LAST_BYTE_SENT
;
877 the_template
= instance
->hostt
;
878 first_instance
= instance
;
882 if ((instance
->cmd_per_lun
> 1) || (instance
->can_queue
> 1))
883 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
884 " without AUTOSENSE option, contingent allegiance conditions may\n"
885 " be incorrectly cleared.\n", HOSTNO
);
886 #endif /* def AUTOSENSE */
888 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
889 NCR5380_write(MODE_REG
, MR_BASE
);
890 NCR5380_write(TARGET_COMMAND_REG
, 0);
891 NCR5380_write(SELECT_ENABLE_REG
, 0);
897 * our own old-style timeout update
900 * The strategy is to cause the timer code to call scsi_times_out()
901 * when the soonest timeout is pending.
902 * The arguments are used when we are queueing a new command, because
903 * we do not want to subtract the time used from this time, but when we
904 * set the timer, we want to take this value into account.
907 int atari_scsi_update_timeout(Scsi_Cmnd
* SCset
, int timeout
)
912 * We are using the new error handling code to actually register/deregister
913 * timers for timeout.
916 if (!timer_pending(&SCset
->eh_timeout
))
919 rtn
= SCset
->eh_timeout
.expires
- jiffies
;
922 del_timer(&SCset
->eh_timeout
);
923 SCset
->eh_timeout
.data
= (unsigned long)NULL
;
924 SCset
->eh_timeout
.expires
= 0;
926 if (SCset
->eh_timeout
.data
!= (unsigned long)NULL
)
927 del_timer(&SCset
->eh_timeout
);
928 SCset
->eh_timeout
.data
= (unsigned long)SCset
;
929 SCset
->eh_timeout
.expires
= jiffies
+ timeout
;
930 add_timer(&SCset
->eh_timeout
);
936 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
937 * void (*done)(Scsi_Cmnd *))
939 * Purpose : enqueues a SCSI command
941 * Inputs : cmd - SCSI command, done - function called on completion, with
942 * a pointer to the command descriptor.
947 * cmd is added to the per instance issue_queue, with minor
948 * twiddling done to the host specific fields of cmd. If the
949 * main coroutine is not running, it is restarted.
953 static int NCR5380_queue_command(Scsi_Cmnd
*cmd
, void (*done
)(Scsi_Cmnd
*))
955 SETUP_HOSTDATA(cmd
->device
->host
);
959 // extern int update_timeout(Scsi_Cmnd * SCset, int timeout);
961 #if (NDEBUG & NDEBUG_NO_WRITE)
962 switch (cmd
->cmnd
[0]) {
965 printk(KERN_NOTICE
"scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
967 cmd
->result
= (DID_ERROR
<< 16);
971 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
975 if (!hostdata
->connected
&& !hostdata
->issue_queue
&&
976 !hostdata
->disconnected_queue
) {
977 hostdata
->timebase
= jiffies
;
980 # ifdef NCR5380_STAT_LIMIT
981 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
983 switch (cmd
->cmnd
[0]) {
987 hostdata
->time_write
[cmd
->device
->id
] -= (jiffies
- hostdata
->timebase
);
988 hostdata
->bytes_write
[cmd
->device
->id
] += cmd
->request_bufflen
;
989 hostdata
->pendingw
++;
994 hostdata
->time_read
[cmd
->device
->id
] -= (jiffies
- hostdata
->timebase
);
995 hostdata
->bytes_read
[cmd
->device
->id
] += cmd
->request_bufflen
;
996 hostdata
->pendingr
++;
1002 * We use the host_scribble field as a pointer to the next command
1006 SET_NEXT(cmd
, NULL
);
1007 cmd
->scsi_done
= done
;
1012 * Insert the cmd into the issue queue. Note that REQUEST SENSE
1013 * commands are added to the head of the queue since any command will
1014 * clear the contingent allegiance condition that exists and the
1015 * sense data is only guaranteed to be valid while the condition exists.
1018 local_irq_save(flags
);
1019 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
1020 * Otherwise a running NCR5380_main may steal the lock.
1021 * Lock before actually inserting due to fairness reasons explained in
1022 * atari_scsi.c. If we insert first, then it's impossible for this driver
1023 * to release the lock.
1024 * Stop timer for this command while waiting for the lock, or timeouts
1025 * may happen (and they really do), and it's no good if the command doesn't
1026 * appear in any of the queues.
1027 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1028 * because also a timer int can trigger an abort or reset, which would
1029 * alter queues and touch the lock.
1032 oldto
= atari_scsi_update_timeout(cmd
, 0);
1034 atari_scsi_update_timeout(cmd
, oldto
);
1036 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
1037 LIST(cmd
, hostdata
->issue_queue
);
1038 SET_NEXT(cmd
, hostdata
->issue_queue
);
1039 hostdata
->issue_queue
= cmd
;
1041 for (tmp
= (Scsi_Cmnd
*)hostdata
->issue_queue
;
1042 NEXT(tmp
); tmp
= NEXT(tmp
))
1047 local_irq_restore(flags
);
1049 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd
),
1050 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
1052 /* If queue_command() is called from an interrupt (real one or bottom
1053 * half), we let queue_main() do the job of taking care about main. If it
1054 * is already running, this is a no-op, else main will be queued.
1056 * If we're not in an interrupt, we can call NCR5380_main()
1057 * unconditionally, because it cannot be already running.
1059 if (in_interrupt() || ((flags
>> 8) & 7) >= 6)
1067 * Function : NCR5380_main (void)
1069 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1070 * be done on the NCR5380 host adapters in a system. Both
1071 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1072 * in case it is not running.
1074 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1075 * reenable them. This prevents reentrancy and kernel stack overflow.
1078 static void NCR5380_main(struct work_struct
*work
)
1080 Scsi_Cmnd
*tmp
, *prev
;
1081 struct Scsi_Host
*instance
= first_instance
;
1082 struct NCR5380_hostdata
*hostdata
= HOSTDATA(instance
);
1084 unsigned long flags
;
1087 * We run (with interrupts disabled) until we're sure that none of
1088 * the host adapters have anything that can be done, at which point
1089 * we set main_running to 0 and exit.
1091 * Interrupts are enabled before doing various other internal
1092 * instructions, after we've decided that we need to run through
1095 * this should prevent any race conditions.
1097 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1098 * because also a timer int can trigger an abort or reset, which can
1099 * alter queues and touch the Falcon lock.
1102 /* Tell int handlers main() is now already executing. Note that
1103 no races are possible here. If an int comes in before
1104 'main_running' is set here, and queues/executes main via the
1105 task queue, it doesn't do any harm, just this instance of main
1106 won't find any work left to do. */
1111 local_save_flags(flags
);
1113 local_irq_disable(); /* Freeze request queues */
1116 if (!hostdata
->connected
) {
1117 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO
);
1119 * Search through the issue_queue for a command destined
1120 * for a target that's not busy.
1122 #if (NDEBUG & NDEBUG_LISTS)
1123 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
1124 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
1126 /*printk("%p ", tmp);*/
1127 if ((tmp
== prev
) && tmp
)
1129 /* else printk("\n"); */
1131 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
,
1132 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
1134 #if (NDEBUG & NDEBUG_LISTS)
1136 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1137 tmp
, tmp
->device
->id
, hostdata
->busy
[tmp
->device
->id
],
1140 /* When we find one, remove it from the issue queue. */
1141 /* ++guenther: possible race with Falcon locking */
1144 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
1146 !(hostdata
->busy
[tmp
->device
->id
] & (1 << tmp
->device
->lun
))
1149 /* ++guenther: just to be sure, this must be atomic */
1150 local_irq_disable();
1152 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
1153 SET_NEXT(prev
, NEXT(tmp
));
1155 REMOVE(-1, hostdata
->issue_queue
, tmp
, NEXT(tmp
));
1156 hostdata
->issue_queue
= NEXT(tmp
);
1158 SET_NEXT(tmp
, NULL
);
1159 falcon_dont_release
++;
1161 /* reenable interrupts after finding one */
1162 local_irq_restore(flags
);
1165 * Attempt to establish an I_T_L nexus here.
1166 * On success, instance->hostdata->connected is set.
1167 * On failure, we must add the command back to the
1168 * issue queue so we can keep trying.
1170 MAIN_PRINTK("scsi%d: main(): command for target %d "
1171 "lun %d removed from issue_queue\n",
1172 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
);
1174 * REQUEST SENSE commands are issued without tagged
1175 * queueing, even on SCSI-II devices because the
1176 * contingent allegiance condition exists for the
1179 /* ++roman: ...and the standard also requires that
1180 * REQUEST SENSE command are untagged.
1184 cmd_get_tag(tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
1186 if (!NCR5380_select(instance
, tmp
,
1187 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
:
1189 falcon_dont_release
--;
1190 /* release if target did not response! */
1191 falcon_release_lock_if_possible(hostdata
);
1194 local_irq_disable();
1195 LIST(tmp
, hostdata
->issue_queue
);
1196 SET_NEXT(tmp
, hostdata
->issue_queue
);
1197 hostdata
->issue_queue
= tmp
;
1201 falcon_dont_release
--;
1202 local_irq_restore(flags
);
1203 MAIN_PRINTK("scsi%d: main(): select() failed, "
1204 "returned to issue_queue\n", HOSTNO
);
1205 if (hostdata
->connected
)
1208 } /* if target/lun/target queue is not busy */
1209 } /* for issue_queue */
1210 } /* if (!hostdata->connected) */
1212 if (hostdata
->connected
1214 && !hostdata
->dma_len
1217 local_irq_restore(flags
);
1218 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1220 NCR5380_information_transfer(instance
);
1221 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO
);
1226 /* Better allow ints _after_ 'main_running' has been cleared, else
1227 an interrupt could believe we'll pick up the work it left for
1228 us, but we won't see it anymore here... */
1230 local_irq_restore(flags
);
1236 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1238 * Purpose : Called by interrupt handler when DMA finishes or a phase
1239 * mismatch occurs (which would finish the DMA transfer).
1241 * Inputs : instance - this instance of the NCR5380.
1245 static void NCR5380_dma_complete(struct Scsi_Host
*instance
)
1247 SETUP_HOSTDATA(instance
);
1248 int transfered
, saved_data
= 0, overrun
= 0, cnt
, toPIO
;
1249 unsigned char **data
, p
;
1250 volatile int *count
;
1252 if (!hostdata
->connected
) {
1253 printk(KERN_WARNING
"scsi%d: received end of DMA interrupt with "
1254 "no connected cmd\n", HOSTNO
);
1258 if (atari_read_overruns
) {
1259 p
= hostdata
->connected
->SCp
.phase
;
1262 if ((NCR5380_read(BUS_AND_STATUS_REG
) &
1263 (BASR_PHASE_MATCH
|BASR_ACK
)) ==
1264 (BASR_PHASE_MATCH
|BASR_ACK
)) {
1265 saved_data
= NCR5380_read(INPUT_DATA_REG
);
1267 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO
);
1272 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1273 HOSTNO
, NCR5380_read(BUS_AND_STATUS_REG
),
1274 NCR5380_read(STATUS_REG
));
1276 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1277 NCR5380_write(MODE_REG
, MR_BASE
);
1278 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1280 transfered
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1281 hostdata
->dma_len
= 0;
1283 data
= (unsigned char **)&hostdata
->connected
->SCp
.ptr
;
1284 count
= &hostdata
->connected
->SCp
.this_residual
;
1285 *data
+= transfered
;
1286 *count
-= transfered
;
1288 if (atari_read_overruns
) {
1289 if ((NCR5380_read(STATUS_REG
) & PHASE_MASK
) == p
&& (p
& SR_IO
)) {
1290 cnt
= toPIO
= atari_read_overruns
;
1292 DMA_PRINTK("Got an input overrun, using saved byte\n");
1293 *(*data
)++ = saved_data
;
1298 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt
, (long)*data
);
1299 NCR5380_transfer_pio(instance
, &p
, &cnt
, data
);
1300 *count
-= toPIO
- cnt
;
1304 #endif /* REAL_DMA */
1308 * Function : void NCR5380_intr (int irq)
1310 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1311 * from the disconnected queue, and restarting NCR5380_main()
1314 * Inputs : int irq, irq that caused this interrupt.
1318 static irqreturn_t
NCR5380_intr(int irq
, void *dev_id
)
1320 struct Scsi_Host
*instance
= first_instance
;
1321 int done
= 1, handled
= 0;
1324 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO
);
1326 /* Look for pending interrupts */
1327 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1328 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO
, basr
);
1329 /* dispatch to appropriate routine if found and done=0 */
1330 if (basr
& BASR_IRQ
) {
1331 NCR_PRINT(NDEBUG_INTR
);
1332 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
|SR_IO
)) == (SR_SEL
|SR_IO
)) {
1335 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO
);
1336 NCR5380_reselect(instance
);
1337 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1338 } else if (basr
& BASR_PARITY_ERROR
) {
1339 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO
);
1340 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1341 } else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1342 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO
);
1343 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1346 * The rest of the interrupt conditions can occur only during a
1350 #if defined(REAL_DMA)
1352 * We should only get PHASE MISMATCH and EOP interrupts if we have
1353 * DMA enabled, so do a sanity check based on the current setting
1354 * of the MODE register.
1357 if ((NCR5380_read(MODE_REG
) & MR_DMA_MODE
) &&
1358 ((basr
& BASR_END_DMA_TRANSFER
) ||
1359 !(basr
& BASR_PHASE_MATCH
))) {
1361 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO
);
1362 NCR5380_dma_complete( instance
);
1366 #endif /* REAL_DMA */
1368 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1369 if (basr
& BASR_PHASE_MATCH
)
1370 printk(KERN_NOTICE
"scsi%d: unknown interrupt, "
1371 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1372 HOSTNO
, basr
, NCR5380_read(MODE_REG
),
1373 NCR5380_read(STATUS_REG
));
1374 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1376 } /* if !(SELECTION || PARITY) */
1378 } /* BASR & IRQ */ else {
1379 printk(KERN_NOTICE
"scsi%d: interrupt without IRQ bit set in BASR, "
1380 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO
, basr
,
1381 NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1382 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1386 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO
);
1387 /* Put a call to NCR5380_main() on the queue... */
1390 return IRQ_RETVAL(handled
);
1393 #ifdef NCR5380_STATS
1394 static void collect_stats(struct NCR5380_hostdata
* hostdata
, Scsi_Cmnd
*cmd
)
1396 # ifdef NCR5380_STAT_LIMIT
1397 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
1399 switch (cmd
->cmnd
[0]) {
1403 hostdata
->time_write
[cmd
->device
->id
] += (jiffies
- hostdata
->timebase
);
1404 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
1405 hostdata
->pendingw
--;
1410 hostdata
->time_read
[cmd
->device
->id
] += (jiffies
- hostdata
->timebase
);
1411 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
1412 hostdata
->pendingr
--;
1419 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1422 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1423 * including ARBITRATION, SELECTION, and initial message out for
1424 * IDENTIFY and queue messages.
1426 * Inputs : instance - instantiation of the 5380 driver on which this
1427 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1428 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1429 * the command that is presently connected.
1431 * Returns : -1 if selection could not execute for some reason,
1432 * 0 if selection succeeded or failed because the target
1436 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1437 * with registers as they should have been on entry - ie
1438 * SELECT_ENABLE will be set appropriately, the NCR5380
1439 * will cease to drive any SCSI bus signals.
1441 * If successful : I_T_L or I_T_L_Q nexus will be established,
1442 * instance->connected will be set to cmd.
1443 * SELECT interrupt will be disabled.
1445 * If failed (no target) : cmd->scsi_done() will be called, and the
1446 * cmd->result host byte set to DID_BAD_TARGET.
1449 static int NCR5380_select(struct Scsi_Host
*instance
, Scsi_Cmnd
*cmd
, int tag
)
1451 SETUP_HOSTDATA(instance
);
1452 unsigned char tmp
[3], phase
;
1453 unsigned char *data
;
1455 unsigned long timeout
;
1456 unsigned long flags
;
1458 hostdata
->restart_select
= 0;
1459 NCR_PRINT(NDEBUG_ARBITRATION
);
1460 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1464 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1465 * data bus during SELECTION.
1468 local_irq_save(flags
);
1469 if (hostdata
->connected
) {
1470 local_irq_restore(flags
);
1473 NCR5380_write(TARGET_COMMAND_REG
, 0);
1476 * Start arbitration.
1479 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1480 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1482 local_irq_restore(flags
);
1484 /* Wait for arbitration logic to complete */
1485 #if defined(NCR_TIMEOUT)
1487 unsigned long timeout
= jiffies
+ 2*NCR_TIMEOUT
;
1489 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1490 time_before(jiffies
, timeout
) && !hostdata
->connected
)
1492 if (time_after_eq(jiffies
, timeout
)) {
1493 printk("scsi : arbitration timeout at %d\n", __LINE__
);
1494 NCR5380_write(MODE_REG
, MR_BASE
);
1495 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1499 #else /* NCR_TIMEOUT */
1500 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
) &&
1501 !hostdata
->connected
)
1505 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO
);
1507 if (hostdata
->connected
) {
1508 NCR5380_write(MODE_REG
, MR_BASE
);
1512 * The arbitration delay is 2.2us, but this is a minimum and there is
1513 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1514 * the integral nature of udelay().
1520 /* Check for lost arbitration */
1521 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1522 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1523 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1524 hostdata
->connected
) {
1525 NCR5380_write(MODE_REG
, MR_BASE
);
1526 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1531 /* after/during arbitration, BSY should be asserted.
1532 IBM DPES-31080 Version S31Q works now */
1533 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1534 NCR5380_write(INITIATOR_COMMAND_REG
,
1535 ICR_BASE
| ICR_ASSERT_SEL
| ICR_ASSERT_BSY
);
1537 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1538 hostdata
->connected
) {
1539 NCR5380_write(MODE_REG
, MR_BASE
);
1540 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1541 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1547 * Again, bus clear + bus settle time is 1.2us, however, this is
1548 * a minimum so we'll udelay ceil(1.2)
1551 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1552 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1558 if (hostdata
->connected
) {
1559 NCR5380_write(MODE_REG
, MR_BASE
);
1560 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1564 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO
);
1567 * Now that we have won arbitration, start Selection process, asserting
1568 * the host and target ID's on the SCSI bus.
1571 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1574 * Raise ATN while SEL is true before BSY goes false from arbitration,
1575 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1576 * phase immediately after selection.
1579 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1580 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1581 NCR5380_write(MODE_REG
, MR_BASE
);
1584 * Reselect interrupts must be turned off prior to the dropping of BSY,
1585 * otherwise we will trigger an interrupt.
1588 if (hostdata
->connected
) {
1589 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1593 NCR5380_write(SELECT_ENABLE_REG
, 0);
1596 * The initiator shall then wait at least two deskew delays and release
1599 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1602 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1603 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1606 * Something weird happens when we cease to drive BSY - looks
1607 * like the board/chip is letting us do another read before the
1608 * appropriate propagation delay has expired, and we're confusing
1609 * a BSY signal from ourselves as the target's response to SELECTION.
1611 * A small delay (the 'C++' frontend breaks the pipeline with an
1612 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1613 * tighter 'C' code breaks and requires this) solves the problem -
1614 * the 1 us delay is arbitrary, and only used because this delay will
1615 * be the same on other platforms and since it works here, it should
1618 * wingel suggests that this could be due to failing to wait
1624 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1627 * The SCSI specification calls for a 250 ms timeout for the actual
1631 timeout
= jiffies
+ 25;
1634 * XXX very interesting - we're seeing a bounce where the BSY we
1635 * asserted is being reflected / still asserted (propagation delay?)
1636 * and it's detecting as true. Sigh.
1640 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1641 * IO while SEL is true. But again, there are some disks out the in the
1642 * world that do that nevertheless. (Somebody claimed that this announces
1643 * reselection capability of the target.) So we better skip that test and
1644 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1647 while (time_before(jiffies
, timeout
) &&
1648 !(NCR5380_read(STATUS_REG
) & (SR_BSY
| SR_IO
)))
1651 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) == (SR_SEL
| SR_IO
)) {
1652 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1653 NCR5380_reselect(instance
);
1654 printk(KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1656 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1660 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) & SR_BSY
))
1665 * No less than two deskew delays after the initiator detects the
1666 * BSY signal is true, it shall release the SEL signal and may
1667 * change the DATA BUS. -wingel
1672 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1674 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1675 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1676 if (hostdata
->targets_present
& (1 << cmd
->device
->id
)) {
1677 printk(KERN_ERR
"scsi%d: weirdness\n", HOSTNO
);
1678 if (hostdata
->restart_select
)
1679 printk(KERN_NOTICE
"\trestart select\n");
1680 NCR_PRINT(NDEBUG_ANY
);
1681 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1684 cmd
->result
= DID_BAD_TARGET
<< 16;
1685 #ifdef NCR5380_STATS
1686 collect_stats(hostdata
, cmd
);
1691 cmd
->scsi_done(cmd
);
1692 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1693 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO
);
1694 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1698 hostdata
->targets_present
|= (1 << cmd
->device
->id
);
1701 * Since we followed the SCSI spec, and raised ATN while SEL
1702 * was true but before BSY was false during selection, the information
1703 * transfer phase should be a MESSAGE OUT phase so that we can send the
1706 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1707 * message (2 bytes) with a tag ID that we increment with every command
1708 * until it wraps back to 0.
1710 * XXX - it turns out that there are some broken SCSI-II devices,
1711 * which claim to support tagged queuing but fail when more than
1712 * some number of commands are issued at once.
1715 /* Wait for start of REQ/ACK handshake */
1716 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
1719 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1720 HOSTNO
, cmd
->device
->id
);
1721 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1724 if (cmd
->tag
!= TAG_NONE
) {
1725 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1733 #endif /* SUPPORT_TAGS */
1735 /* Send message(s) */
1737 phase
= PHASE_MSGOUT
;
1738 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1739 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO
);
1740 /* XXX need to handle errors here */
1741 hostdata
->connected
= cmd
;
1742 #ifndef SUPPORT_TAGS
1743 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1746 initialize_SCp(cmd
);
1752 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1753 * unsigned char *phase, int *count, unsigned char **data)
1755 * Purpose : transfers data in given phase using polled I/O
1757 * Inputs : instance - instance of driver, *phase - pointer to
1758 * what phase is expected, *count - pointer to number of
1759 * bytes to transfer, **data - pointer to data pointer.
1761 * Returns : -1 when different phase is entered without transferring
1762 * maximum number of bytes, 0 if all bytes are transfered or exit
1765 * Also, *phase, *count, *data are modified in place.
1767 * XXX Note : handling for bus free may be useful.
1771 * Note : this code is not as quick as it could be, however it
1772 * IS 100% reliable, and for the actual data transfer where speed
1773 * counts, we will always do a pseudo DMA or DMA transfer.
1776 static int NCR5380_transfer_pio(struct Scsi_Host
*instance
,
1777 unsigned char *phase
, int *count
,
1778 unsigned char **data
)
1780 register unsigned char p
= *phase
, tmp
;
1781 register int c
= *count
;
1782 register unsigned char *d
= *data
;
1785 * The NCR5380 chip will only drive the SCSI bus when the
1786 * phase specified in the appropriate bits of the TARGET COMMAND
1787 * REGISTER match the STATUS REGISTER
1790 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1794 * Wait for assertion of REQ, after which the phase bits will be
1797 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
))
1800 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO
);
1802 /* Check for phase mismatch */
1803 if ((tmp
& PHASE_MASK
) != p
) {
1804 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO
);
1805 NCR_PRINT_PHASE(NDEBUG_PIO
);
1809 /* Do actual transfer from SCSI bus to / from memory */
1811 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1813 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1818 * The SCSI standard suggests that in MSGOUT phase, the initiator
1819 * should drop ATN on the last byte of the message phase
1820 * after REQ has been asserted for the handshake but before
1821 * the initiator raises ACK.
1825 if (!((p
& SR_MSG
) && c
> 1)) {
1826 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
1827 NCR_PRINT(NDEBUG_PIO
);
1828 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1829 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1831 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1832 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1833 NCR_PRINT(NDEBUG_PIO
);
1834 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1835 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1838 NCR_PRINT(NDEBUG_PIO
);
1839 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1842 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1845 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO
);
1848 * We have several special cases to consider during REQ/ACK handshaking :
1849 * 1. We were in MSGOUT phase, and we are on the last byte of the
1850 * message. ATN must be dropped as ACK is dropped.
1852 * 2. We are in a MSGIN phase, and we are on the last byte of the
1853 * message. We must exit with ACK asserted, so that the calling
1854 * code may raise ATN before dropping ACK to reject the message.
1856 * 3. ACK and ATN are clear and the target may proceed as normal.
1858 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1859 if (p
== PHASE_MSGOUT
&& c
> 1)
1860 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1862 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1866 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO
, c
);
1870 tmp
= NCR5380_read(STATUS_REG
);
1871 /* The phase read from the bus is valid if either REQ is (already)
1872 * asserted or if ACK hasn't been released yet. The latter is the case if
1873 * we're in MSGIN and all wanted bytes have been received.
1875 if ((tmp
& SR_REQ
) || (p
== PHASE_MSGIN
&& c
== 0))
1876 *phase
= tmp
& PHASE_MASK
;
1878 *phase
= PHASE_UNKNOWN
;
1880 if (!c
|| (*phase
== p
))
1887 * Function : do_abort (Scsi_Host *host)
1889 * Purpose : abort the currently established nexus. Should only be
1890 * called from a routine which can drop into a
1892 * Returns : 0 on success, -1 on failure.
1895 static int do_abort(struct Scsi_Host
*host
)
1897 unsigned char tmp
, *msgptr
, phase
;
1900 /* Request message out phase */
1901 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1904 * Wait for the target to indicate a valid phase by asserting
1905 * REQ. Once this happens, we'll have either a MSGOUT phase
1906 * and can immediately send the ABORT message, or we'll have some
1907 * other phase and will have to source/sink data.
1909 * We really don't care what value was on the bus or what value
1910 * the target sees, so we just handshake.
1913 while (!(tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
)
1916 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1918 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
1919 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1921 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
1923 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1929 phase
= PHASE_MSGOUT
;
1930 NCR5380_transfer_pio(host
, &phase
, &len
, &msgptr
);
1933 * If we got here, and the command completed successfully,
1934 * we're about to go into bus free state.
1937 return len
? -1 : 0;
1940 #if defined(REAL_DMA)
1942 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1943 * unsigned char *phase, int *count, unsigned char **data)
1945 * Purpose : transfers data in given phase using either real
1948 * Inputs : instance - instance of driver, *phase - pointer to
1949 * what phase is expected, *count - pointer to number of
1950 * bytes to transfer, **data - pointer to data pointer.
1952 * Returns : -1 when different phase is entered without transferring
1953 * maximum number of bytes, 0 if all bytes or transfered or exit
1956 * Also, *phase, *count, *data are modified in place.
1961 static int NCR5380_transfer_dma(struct Scsi_Host
*instance
,
1962 unsigned char *phase
, int *count
,
1963 unsigned char **data
)
1965 SETUP_HOSTDATA(instance
);
1966 register int c
= *count
;
1967 register unsigned char p
= *phase
;
1968 register unsigned char *d
= *data
;
1970 unsigned long flags
;
1972 if ((tmp
= (NCR5380_read(STATUS_REG
) & PHASE_MASK
)) != p
) {
1977 if (atari_read_overruns
&& (p
& SR_IO
))
1978 c
-= atari_read_overruns
;
1980 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1981 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1982 c
, (p
& SR_IO
) ? "to" : "from", d
);
1984 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1987 NCR5380_write(MODE_REG
, MR_BASE
| MR_DMA_MODE
| MR_ENABLE_EOP_INTR
| MR_MONITOR_BSY
);
1988 #endif /* def REAL_DMA */
1991 /* On the Medusa, it is a must to initialize the DMA before
1992 * starting the NCR. This is also the cleaner way for the TT.
1994 local_irq_save(flags
);
1995 hostdata
->dma_len
= (p
& SR_IO
) ?
1996 NCR5380_dma_read_setup(instance
, d
, c
) :
1997 NCR5380_dma_write_setup(instance
, d
, c
);
1998 local_irq_restore(flags
);
2002 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
2004 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_DATA
);
2005 NCR5380_write(START_DMA_SEND_REG
, 0);
2009 /* On the Falcon, the DMA setup must be done after the last */
2010 /* NCR access, else the DMA setup gets trashed!
2012 local_irq_save(flags
);
2013 hostdata
->dma_len
= (p
& SR_IO
) ?
2014 NCR5380_dma_read_setup(instance
, d
, c
) :
2015 NCR5380_dma_write_setup(instance
, d
, c
);
2016 local_irq_restore(flags
);
2020 #endif /* defined(REAL_DMA) */
2023 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
2025 * Purpose : run through the various SCSI phases and do as the target
2026 * directs us to. Operates on the currently connected command,
2027 * instance->connected.
2029 * Inputs : instance, instance for which we are doing commands
2031 * Side effects : SCSI things happen, the disconnected queue will be
2032 * modified if a command disconnects, *instance->connected will
2035 * XXX Note : we need to watch for bus free or a reset condition here
2036 * to recover from an unexpected bus free condition.
2039 static void NCR5380_information_transfer(struct Scsi_Host
*instance
)
2041 SETUP_HOSTDATA(instance
);
2042 unsigned long flags
;
2043 unsigned char msgout
= NOP
;
2046 #if defined(REAL_DMA)
2049 unsigned char *data
;
2050 unsigned char phase
, tmp
, extended_msg
[10], old_phase
= 0xff;
2051 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
2054 tmp
= NCR5380_read(STATUS_REG
);
2055 /* We only have a valid SCSI phase when REQ is asserted */
2057 phase
= (tmp
& PHASE_MASK
);
2058 if (phase
!= old_phase
) {
2060 NCR_PRINT_PHASE(NDEBUG_INFORMATION
);
2063 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2064 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2066 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2068 while (NCR5380_read(STATUS_REG
) & SR_REQ
)
2070 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2078 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2079 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2080 "aborted\n", HOSTNO
);
2083 cmd
->result
= DID_ERROR
<< 16;
2089 * If there is no room left in the current buffer in the
2090 * scatter-gather list, move onto the next one.
2093 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2095 --cmd
->SCp
.buffers_residual
;
2096 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2097 cmd
->SCp
.ptr
= page_address(cmd
->SCp
.buffer
->page
) +
2098 cmd
->SCp
.buffer
->offset
;
2099 /* ++roman: Try to merge some scatter-buffers if
2100 * they are at contiguous physical addresses.
2102 merge_contiguous_buffers(cmd
);
2103 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2104 HOSTNO
, cmd
->SCp
.this_residual
,
2105 cmd
->SCp
.buffers_residual
);
2109 * The preferred transfer method is going to be
2110 * PSEUDO-DMA for systems that are strictly PIO,
2111 * since we can let the hardware do the handshaking.
2113 * For this to work, we need to know the transfersize
2114 * ahead of time, since the pseudo-DMA code will sit
2115 * in an unconditional loop.
2118 /* ++roman: I suggest, this should be
2120 * instead of leaving REAL_DMA out.
2123 #if defined(REAL_DMA)
2124 if (!cmd
->device
->borken
&&
2125 (transfersize
= NCR5380_dma_xfer_len(instance
,cmd
,phase
)) > 31) {
2127 cmd
->SCp
.phase
= phase
;
2128 if (NCR5380_transfer_dma(instance
, &phase
,
2129 &len
, (unsigned char **)&cmd
->SCp
.ptr
)) {
2131 * If the watchdog timer fires, all future
2132 * accesses to this device will use the
2134 printk(KERN_NOTICE
"scsi%d: switching target %d "
2135 "lun %d to slow handshake\n", HOSTNO
,
2136 cmd
->device
->id
, cmd
->device
->lun
);
2137 cmd
->device
->borken
= 1;
2138 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2142 cmd
->result
= DID_ERROR
<< 16;
2144 /* XXX - need to source or sink data here, as appropriate */
2147 /* ++roman: When using real DMA,
2148 * information_transfer() should return after
2149 * starting DMA since it has nothing more to
2154 cmd
->SCp
.this_residual
-= transfersize
- len
;
2158 #endif /* defined(REAL_DMA) */
2159 NCR5380_transfer_pio(instance
, &phase
,
2160 (int *)&cmd
->SCp
.this_residual
,
2161 (unsigned char **)&cmd
->SCp
.ptr
);
2166 NCR5380_write(SELECT_ENABLE_REG
, 0); /* disable reselects */
2167 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2168 cmd
->SCp
.Message
= tmp
;
2172 * Linking lets us reduce the time required to get the
2173 * next command out to the device, hopefully this will
2174 * mean we don't waste another revolution due to the delays
2175 * required by ARBITRATION and another SELECTION.
2177 * In the current implementation proposal, low level drivers
2178 * merely have to start the next command, pointed to by
2179 * next_link, done() is called as with unlinked commands.
2182 case LINKED_CMD_COMPLETE
:
2183 case LINKED_FLG_CMD_COMPLETE
:
2184 /* Accept message by clearing ACK */
2185 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2187 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2188 "complete.\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2190 /* Enable reselect interrupts */
2191 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2193 * Sanity check : A linked command should only terminate
2194 * with one of these messages if there are more linked
2195 * commands available.
2198 if (!cmd
->next_link
) {
2199 printk(KERN_NOTICE
"scsi%d: target %d lun %d "
2200 "linked command complete, no next_link\n",
2201 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2207 initialize_SCp(cmd
->next_link
);
2208 /* The next command is still part of this process; copy it
2209 * and don't free it! */
2210 cmd
->next_link
->tag
= cmd
->tag
;
2211 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2212 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2213 "done, calling scsi_done().\n",
2214 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2215 #ifdef NCR5380_STATS
2216 collect_stats(hostdata
, cmd
);
2218 cmd
->scsi_done(cmd
);
2219 cmd
= hostdata
->connected
;
2221 #endif /* def LINKED */
2223 case COMMAND_COMPLETE
:
2224 /* Accept message by clearing ACK */
2225 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2226 /* ++guenther: possible race with Falcon locking */
2227 falcon_dont_release
++;
2228 hostdata
->connected
= NULL
;
2229 QU_PRINTK("scsi%d: command for target %d, lun %d "
2230 "completed\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2233 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2234 /* Turn a QUEUE FULL status into BUSY, I think the
2235 * mid level cannot handle QUEUE FULL :-( (The
2236 * command is retried after BUSY). Also update our
2237 * queue size to the number of currently issued
2240 /* ++Andreas: the mid level code knows about
2242 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
];
2243 TAG_PRINTK("scsi%d: target %d lun %d returned "
2244 "QUEUE_FULL after %d commands\n",
2245 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2247 if (ta
->queue_size
> ta
->nr_allocated
)
2248 ta
->nr_allocated
= ta
->queue_size
;
2251 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2253 /* Enable reselect interrupts */
2254 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2257 * I'm not sure what the correct thing to do here is :
2259 * If the command that just executed is NOT a request
2260 * sense, the obvious thing to do is to set the result
2261 * code to the values of the stored parameters.
2263 * If it was a REQUEST SENSE command, we need some way to
2264 * differentiate between the failure code of the original
2265 * and the failure code of the REQUEST sense - the obvious
2266 * case is success, where we fall through and leave the
2267 * result code unchanged.
2269 * The non-obvious place is where the REQUEST SENSE failed
2272 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2273 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2274 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2275 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2278 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2279 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2280 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO
);
2281 cmd
->cmnd
[0] = REQUEST_SENSE
;
2282 cmd
->cmnd
[1] &= 0xe0;
2285 cmd
->cmnd
[4] = sizeof(cmd
->sense_buffer
);
2287 cmd
->cmd_len
= COMMAND_SIZE(cmd
->cmnd
[0]);
2290 /* this is initialized from initialize_SCp
2291 cmd->SCp.buffer = NULL;
2292 cmd->SCp.buffers_residual = 0;
2294 cmd
->request_buffer
= (char *) cmd
->sense_buffer
;
2295 cmd
->request_bufflen
= sizeof(cmd
->sense_buffer
);
2297 local_irq_save(flags
);
2298 LIST(cmd
,hostdata
->issue_queue
);
2299 SET_NEXT(cmd
, hostdata
->issue_queue
);
2300 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
2301 local_irq_restore(flags
);
2302 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2303 "issue queue\n", H_NO(cmd
));
2305 #endif /* def AUTOSENSE */
2307 #ifdef NCR5380_STATS
2308 collect_stats(hostdata
, cmd
);
2310 cmd
->scsi_done(cmd
);
2313 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2315 * Restore phase bits to 0 so an interrupted selection,
2316 * arbitration can resume.
2318 NCR5380_write(TARGET_COMMAND_REG
, 0);
2320 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2323 falcon_dont_release
--;
2324 /* ++roman: For Falcon SCSI, release the lock on the
2325 * ST-DMA here if no other commands are waiting on the
2326 * disconnected queue.
2328 falcon_release_lock_if_possible(hostdata
);
2330 case MESSAGE_REJECT
:
2331 /* Accept message by clearing ACK */
2332 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2333 /* Enable reselect interrupts */
2334 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2335 switch (hostdata
->last_message
) {
2336 case HEAD_OF_QUEUE_TAG
:
2337 case ORDERED_QUEUE_TAG
:
2338 case SIMPLE_QUEUE_TAG
:
2339 /* The target obviously doesn't support tagged
2340 * queuing, even though it announced this ability in
2341 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2342 * clear 'tagged_supported' and lock the LUN, since
2343 * the command is treated as untagged further on.
2345 cmd
->device
->tagged_supported
= 0;
2346 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2347 cmd
->tag
= TAG_NONE
;
2348 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2349 "QUEUE_TAG message; tagged queuing "
2351 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2356 /* Accept message by clearing ACK */
2357 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2358 local_irq_save(flags
);
2359 cmd
->device
->disconnect
= 1;
2360 LIST(cmd
,hostdata
->disconnected_queue
);
2361 SET_NEXT(cmd
, hostdata
->disconnected_queue
);
2362 hostdata
->connected
= NULL
;
2363 hostdata
->disconnected_queue
= cmd
;
2364 local_irq_restore(flags
);
2365 QU_PRINTK("scsi%d: command for target %d lun %d was "
2366 "moved from connected to the "
2367 "disconnected_queue\n", HOSTNO
,
2368 cmd
->device
->id
, cmd
->device
->lun
);
2370 * Restore phase bits to 0 so an interrupted selection,
2371 * arbitration can resume.
2373 NCR5380_write(TARGET_COMMAND_REG
, 0);
2375 /* Enable reselect interrupts */
2376 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2377 /* Wait for bus free to avoid nasty timeouts */
2378 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2382 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2383 * operation, in violation of the SCSI spec so we can safely
2384 * ignore SAVE/RESTORE pointers calls.
2386 * Unfortunately, some disks violate the SCSI spec and
2387 * don't issue the required SAVE_POINTERS message before
2388 * disconnecting, and we have to break spec to remain
2392 case RESTORE_POINTERS
:
2393 /* Accept message by clearing ACK */
2394 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2395 /* Enable reselect interrupts */
2396 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2398 case EXTENDED_MESSAGE
:
2400 * Extended messages are sent in the following format :
2402 * 0 EXTENDED_MESSAGE == 1
2403 * 1 length (includes one byte for code, doesn't
2404 * include first two bytes)
2406 * 3..length+1 arguments
2408 * Start the extended message buffer with the EXTENDED_MESSAGE
2409 * byte, since spi_print_msg() wants the whole thing.
2411 extended_msg
[0] = EXTENDED_MESSAGE
;
2412 /* Accept first byte by clearing ACK */
2413 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2415 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO
);
2418 data
= extended_msg
+ 1;
2419 phase
= PHASE_MSGIN
;
2420 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2421 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2422 (int)extended_msg
[1], (int)extended_msg
[2]);
2424 if (!len
&& extended_msg
[1] <=
2425 (sizeof(extended_msg
) - 1)) {
2426 /* Accept third byte by clearing ACK */
2427 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2428 len
= extended_msg
[1] - 1;
2429 data
= extended_msg
+ 3;
2430 phase
= PHASE_MSGIN
;
2432 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2433 EXT_PRINTK("scsi%d: message received, residual %d\n",
2436 switch (extended_msg
[2]) {
2439 case EXTENDED_MODIFY_DATA_POINTER
:
2440 case EXTENDED_EXTENDED_IDENTIFY
:
2444 printk(KERN_NOTICE
"scsi%d: error receiving "
2445 "extended message\n", HOSTNO
);
2448 printk(KERN_NOTICE
"scsi%d: extended message "
2449 "code %02x length %d is too long\n",
2450 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2453 /* Fall through to reject message */
2456 * If we get something weird that we aren't expecting,
2461 printk(KERN_DEBUG
"scsi%d: rejecting message ", HOSTNO
);
2462 spi_print_msg(extended_msg
);
2464 } else if (tmp
!= EXTENDED_MESSAGE
)
2465 printk(KERN_DEBUG
"scsi%d: rejecting unknown "
2466 "message %02x from target %d, lun %d\n",
2467 HOSTNO
, tmp
, cmd
->device
->id
, cmd
->device
->lun
);
2469 printk(KERN_DEBUG
"scsi%d: rejecting unknown "
2471 "code %02x, length %d from target %d, lun %d\n",
2472 HOSTNO
, extended_msg
[1], extended_msg
[0],
2473 cmd
->device
->id
, cmd
->device
->lun
);
2476 msgout
= MESSAGE_REJECT
;
2477 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
2479 } /* switch (tmp) */
2484 hostdata
->last_message
= msgout
;
2485 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2486 if (msgout
== ABORT
) {
2490 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2492 hostdata
->connected
= NULL
;
2493 cmd
->result
= DID_ERROR
<< 16;
2494 #ifdef NCR5380_STATS
2495 collect_stats(hostdata
, cmd
);
2497 cmd
->scsi_done(cmd
);
2498 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2499 falcon_release_lock_if_possible(hostdata
);
2508 * XXX for performance reasons, on machines with a
2509 * PSEUDO-DMA architecture we should probably
2510 * use the dma transfer function.
2512 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2517 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2518 cmd
->SCp
.Status
= tmp
;
2521 printk("scsi%d: unknown phase\n", HOSTNO
);
2522 NCR_PRINT(NDEBUG_ANY
);
2523 } /* switch(phase) */
2524 } /* if (tmp * SR_REQ) */
2529 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2531 * Purpose : does reselection, initializing the instance->connected
2532 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2533 * nexus has been reestablished,
2535 * Inputs : instance - this instance of the NCR5380.
2540 static void NCR5380_reselect(struct Scsi_Host
*instance
)
2542 SETUP_HOSTDATA(instance
);
2543 unsigned char target_mask
;
2544 unsigned char lun
, phase
;
2549 unsigned char msg
[3];
2550 unsigned char *data
;
2551 Scsi_Cmnd
*tmp
= NULL
, *prev
;
2552 /* unsigned long flags; */
2555 * Disable arbitration, etc. since the host adapter obviously
2556 * lost, and tell an interrupted NCR5380_select() to restart.
2559 NCR5380_write(MODE_REG
, MR_BASE
);
2560 hostdata
->restart_select
= 1;
2562 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2564 RSL_PRINTK("scsi%d: reselect\n", HOSTNO
);
2567 * At this point, we have detected that our SCSI ID is on the bus,
2568 * SEL is true and BSY was false for at least one bus settle delay
2571 * We must assert BSY ourselves, until the target drops the SEL
2575 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2577 while (NCR5380_read(STATUS_REG
) & SR_SEL
)
2579 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2582 * Wait for target to go into MSGIN.
2585 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
))
2590 phase
= PHASE_MSGIN
;
2591 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2593 if (!(msg
[0] & 0x80)) {
2594 printk(KERN_DEBUG
"scsi%d: expecting IDENTIFY message, got ", HOSTNO
);
2599 lun
= (msg
[0] & 0x07);
2602 /* If the phase is still MSGIN, the target wants to send some more
2603 * messages. In case it supports tagged queuing, this is probably a
2604 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2607 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2608 /* Accept previous IDENTIFY message by clearing ACK */
2609 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2612 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2613 msg
[1] == SIMPLE_QUEUE_TAG
)
2615 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2616 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2621 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2622 * just reestablished, and remove it from the disconnected queue.
2625 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2626 tmp
; prev
= tmp
, tmp
= NEXT(tmp
)) {
2627 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== tmp
->device
->lun
)
2629 && (tag
== tmp
->tag
)
2632 /* ++guenther: prevent race with falcon_release_lock */
2633 falcon_dont_release
++;
2635 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
2636 SET_NEXT(prev
, NEXT(tmp
));
2638 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, NEXT(tmp
));
2639 hostdata
->disconnected_queue
= NEXT(tmp
);
2641 SET_NEXT(tmp
, NULL
);
2647 printk(KERN_WARNING
"scsi%d: warning: target bitmask %02x lun %d "
2651 "not in disconnected_queue.\n",
2652 HOSTNO
, target_mask
, lun
2658 * Since we have an established nexus that we can't do anything
2659 * with, we must abort it.
2665 /* Accept message by clearing ACK */
2666 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2668 hostdata
->connected
= tmp
;
2669 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2670 HOSTNO
, tmp
->device
->id
, tmp
->device
->lun
, tmp
->tag
);
2671 falcon_dont_release
--;
2676 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2678 * Purpose : abort a command
2680 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2681 * host byte of the result field to, if zero DID_ABORTED is
2684 * Returns : 0 - success, -1 on failure.
2686 * XXX - there is no way to abort the command that is currently
2687 * connected, you have to wait for it to complete. If this is
2688 * a problem, we could implement longjmp() / setjmp(), setjmp()
2689 * called where the loop started in NCR5380_main().
2693 int NCR5380_abort(Scsi_Cmnd
*cmd
)
2695 struct Scsi_Host
*instance
= cmd
->device
->host
;
2696 SETUP_HOSTDATA(instance
);
2697 Scsi_Cmnd
*tmp
, **prev
;
2698 unsigned long flags
;
2700 printk(KERN_NOTICE
"scsi%d: aborting command\n", HOSTNO
);
2701 scsi_print_command(cmd
);
2703 NCR5380_print_status(instance
);
2705 local_irq_save(flags
);
2707 if (!IS_A_TT() && !falcon_got_lock
)
2708 printk(KERN_ERR
"scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2711 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2712 NCR5380_read(BUS_AND_STATUS_REG
),
2713 NCR5380_read(STATUS_REG
));
2717 * Case 1 : If the command is the currently executing command,
2718 * we'll set the aborted flag and return control so that
2719 * information transfer routine can exit cleanly.
2722 if (hostdata
->connected
== cmd
) {
2724 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO
);
2726 * We should perform BSY checking, and make sure we haven't slipped
2730 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2732 * Since we can't change phases until we've completed the current
2733 * handshake, we have to source or sink a byte of data if the current
2734 * phase is not MSGOUT.
2738 * Return control to the executing NCR drive so we can clear the
2739 * aborted flag and get back into our main loop.
2742 if (do_abort(instance
) == 0) {
2743 hostdata
->aborted
= 1;
2744 hostdata
->connected
= NULL
;
2745 cmd
->result
= DID_ABORT
<< 16;
2749 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2751 local_irq_restore(flags
);
2752 cmd
->scsi_done(cmd
);
2753 falcon_release_lock_if_possible(hostdata
);
2754 return SCSI_ABORT_SUCCESS
;
2756 /* local_irq_restore(flags); */
2757 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2758 return SCSI_ABORT_ERROR
;
2764 * Case 2 : If the command hasn't been issued yet, we simply remove it
2765 * from the issue queue.
2767 for (prev
= (Scsi_Cmnd
**)&(hostdata
->issue_queue
),
2768 tmp
= (Scsi_Cmnd
*)hostdata
->issue_queue
;
2769 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2771 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2772 (*prev
) = NEXT(tmp
);
2773 SET_NEXT(tmp
, NULL
);
2774 tmp
->result
= DID_ABORT
<< 16;
2775 local_irq_restore(flags
);
2776 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2778 /* Tagged queuing note: no tag to free here, hasn't been assigned
2780 tmp
->scsi_done(tmp
);
2781 falcon_release_lock_if_possible(hostdata
);
2782 return SCSI_ABORT_SUCCESS
;
2787 * Case 3 : If any commands are connected, we're going to fail the abort
2788 * and let the high level SCSI driver retry at a later time or
2791 * Timeouts, and therefore aborted commands, will be highly unlikely
2792 * and handling them cleanly in this situation would make the common
2793 * case of noresets less efficient, and would pollute our code. So,
2797 if (hostdata
->connected
) {
2798 local_irq_restore(flags
);
2799 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO
);
2800 return SCSI_ABORT_SNOOZE
;
2804 * Case 4: If the command is currently disconnected from the bus, and
2805 * there are no connected commands, we reconnect the I_T_L or
2806 * I_T_L_Q nexus associated with it, go into message out, and send
2809 * This case is especially ugly. In order to reestablish the nexus, we
2810 * need to call NCR5380_select(). The easiest way to implement this
2811 * function was to abort if the bus was busy, and let the interrupt
2812 * handler triggered on the SEL for reselect take care of lost arbitrations
2813 * where necessary, meaning interrupts need to be enabled.
2815 * When interrupts are enabled, the queues may change - so we
2816 * can't remove it from the disconnected queue before selecting it
2817 * because that could cause a failure in hashing the nexus if that
2818 * device reselected.
2820 * Since the queues may change, we can't use the pointers from when we
2823 * So, we must first locate the command, and if NCR5380_select()
2824 * succeeds, then issue the abort, relocate the command and remove
2825 * it from the disconnected queue.
2828 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
;
2831 local_irq_restore(flags
);
2832 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO
);
2834 if (NCR5380_select(instance
, cmd
, (int)cmd
->tag
))
2835 return SCSI_ABORT_BUSY
;
2837 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO
);
2841 local_irq_save(flags
);
2842 for (prev
= (Scsi_Cmnd
**)&(hostdata
->disconnected_queue
),
2843 tmp
= (Scsi_Cmnd
*)hostdata
->disconnected_queue
;
2844 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
)) {
2846 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2848 SET_NEXT(tmp
, NULL
);
2849 tmp
->result
= DID_ABORT
<< 16;
2850 /* We must unlock the tag/LUN immediately here, since the
2851 * target goes to BUS FREE and doesn't send us another
2852 * message (COMMAND_COMPLETE or the like)
2857 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2859 local_irq_restore(flags
);
2860 tmp
->scsi_done(tmp
);
2861 falcon_release_lock_if_possible(hostdata
);
2862 return SCSI_ABORT_SUCCESS
;
2869 * Case 5 : If we reached this point, the command was not found in any of
2872 * We probably reached this point because of an unlikely race condition
2873 * between the command completing successfully and the abortion code,
2874 * so we won't panic, but we will notify the user in case something really
2878 local_irq_restore(flags
);
2879 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully\n"
2880 KERN_INFO
" before abortion\n", HOSTNO
);
2882 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2883 * possible at all) At least, we should check if the lock could be
2884 * released after the abort, in case it is kept due to some bug.
2886 falcon_release_lock_if_possible(hostdata
);
2888 return SCSI_ABORT_NOT_RUNNING
;
2893 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
2895 * Purpose : reset the SCSI bus.
2897 * Returns : SCSI_RESET_WAKEUP
2901 static int NCR5380_bus_reset(Scsi_Cmnd
*cmd
)
2903 SETUP_HOSTDATA(cmd
->device
->host
);
2905 unsigned long flags
;
2907 Scsi_Cmnd
*connected
, *disconnected_queue
;
2910 if (!IS_A_TT() && !falcon_got_lock
)
2911 printk(KERN_ERR
"scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2914 NCR5380_print_status(cmd
->device
->host
);
2917 NCR5380_write(TARGET_COMMAND_REG
,
2918 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG
)));
2920 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
2922 /* reset NCR registers */
2923 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2924 NCR5380_write(MODE_REG
, MR_BASE
);
2925 NCR5380_write(TARGET_COMMAND_REG
, 0);
2926 NCR5380_write(SELECT_ENABLE_REG
, 0);
2927 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2928 * through anymore ... */
2929 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
2931 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2932 /* XXX see below XXX */
2934 /* MSch: old-style reset: actually abort all command processing here */
2936 /* After the reset, there are no more connected or disconnected commands
2937 * and no busy units; to avoid problems with re-inserting the commands
2938 * into the issue_queue (via scsi_done()), the aborted commands are
2939 * remembered in local variables first.
2941 local_irq_save(flags
);
2942 connected
= (Scsi_Cmnd
*)hostdata
->connected
;
2943 hostdata
->connected
= NULL
;
2944 disconnected_queue
= (Scsi_Cmnd
*)hostdata
->disconnected_queue
;
2945 hostdata
->disconnected_queue
= NULL
;
2949 for (i
= 0; i
< 8; ++i
)
2950 hostdata
->busy
[i
] = 0;
2952 hostdata
->dma_len
= 0;
2954 local_irq_restore(flags
);
2956 /* In order to tell the mid-level code which commands were aborted,
2957 * set the command status to DID_RESET and call scsi_done() !!!
2958 * This ultimately aborts processing of these commands in the mid-level.
2961 if ((cmd
= connected
)) {
2962 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd
));
2963 cmd
->result
= (cmd
->result
& 0xffff) | (DID_RESET
<< 16);
2964 cmd
->scsi_done(cmd
);
2967 for (i
= 0; (cmd
= disconnected_queue
); ++i
) {
2968 disconnected_queue
= NEXT(cmd
);
2969 SET_NEXT(cmd
, NULL
);
2970 cmd
->result
= (cmd
->result
& 0xffff) | (DID_RESET
<< 16);
2971 cmd
->scsi_done(cmd
);
2974 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i
);
2976 /* The Falcon lock should be released after a reset...
2978 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2979 * unlocking and enabling dma interrupt.
2981 /* falcon_release_lock_if_possible( hostdata );*/
2983 /* since all commands have been explicitly terminated, we need to tell
2984 * the midlevel code that the reset was SUCCESSFUL, and there is no
2985 * need to 'wake up' the commands by a request_sense
2987 return SCSI_RESET_SUCCESS
| SCSI_RESET_BUS_RESET
;
2990 /* MSch: new-style reset handling: let the mid-level do what it can */
2992 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2993 * Mid-level is supposed to requeue all commands that were active on the
2994 * various low-level queues. In fact it does this, but that's not enough
2995 * because all these commands are subject to timeout. And if a timeout
2996 * happens for any removed command, *_abort() is called but all queues
2997 * are now empty. Abort then gives up the falcon lock, which is fatal,
2998 * since the mid-level will queue more commands and must have the lock
2999 * (it's all happening inside timer interrupt handler!!).
3000 * Even worse, abort will return NOT_RUNNING for all those commands not
3001 * on any queue, so they won't be retried ...
3003 * Conclusion: either scsi.c disables timeout for all resetted commands
3004 * immediately, or we lose! As of linux-2.0.20 it doesn't.
3007 /* After the reset, there are no more connected or disconnected commands
3008 * and no busy units; so clear the low-level status here to avoid
3009 * conflicts when the mid-level code tries to wake up the affected
3013 if (hostdata
->issue_queue
)
3014 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd
));
3015 if (hostdata
->connected
)
3016 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd
));
3017 if (hostdata
->disconnected_queue
)
3018 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd
));
3020 local_irq_save(flags
);
3021 hostdata
->issue_queue
= NULL
;
3022 hostdata
->connected
= NULL
;
3023 hostdata
->disconnected_queue
= NULL
;
3027 for (i
= 0; i
< 8; ++i
)
3028 hostdata
->busy
[i
] = 0;
3030 hostdata
->dma_len
= 0;
3032 local_irq_restore(flags
);
3034 /* we did no complete reset of all commands, so a wakeup is required */
3035 return SCSI_RESET_WAKEUP
| SCSI_RESET_BUS_RESET
;