1 /* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by
4 * NCR 5380 generic driver routines. These should make it *trivial*
5 * to implement 5380 SCSI drivers under Linux with a non-trantor
8 * Note that these routines also work with NR53c400 family chips.
10 * Copyright 1993, Drew Eckhardt
12 * (Unix and Linux consulting and custom programming)
16 * DISTRIBUTION RELEASE 6.
18 * For more information, please consult
21 * SCSI Protocol Controller
24 * NCR Microelectronics
25 * 1635 Aeroplaza Drive
26 * Colorado Springs, CO 80916
32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
35 * - Some of the debug statements were incorrect (undefined variables and the
36 * like). I fixed that.
38 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
39 * possible DMA transfer size should also happen for REAL_DMA. I added this
40 * in the #if statement.
42 * - When using real DMA, information_transfer() should return in a DATAOUT
43 * phase after starting the DMA. It has nothing more to do.
45 * - The interrupt service routine should run main after end of DMA, too (not
46 * only after RESELECTION interrupts). Additionally, it should _not_ test
47 * for more interrupts after running main, since a DMA process may have
48 * been started and interrupts are turned on now. The new int could happen
49 * inside the execution of NCR5380_intr(), leading to recursive
52 * - I've added a function merge_contiguous_buffers() that tries to
53 * merge scatter-gather buffers that are located at contiguous
54 * physical addresses and can be processed with the same DMA setup.
55 * Since most scatter-gather operations work on a page (4K) of
56 * 4 buffers (1K), in more than 90% of all cases three interrupts and
57 * DMA setup actions are saved.
59 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
60 * and USLEEP, because these were messing up readability and will never be
61 * needed for Atari SCSI.
63 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
64 * stuff), and 'main' is executed in a bottom half if awoken by an
67 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
68 * constructs. In my eyes, this made the source rather unreadable, so I
69 * finally replaced that by the *_PRINTK() macros.
74 * Further development / testing that should be done :
75 * 1. Test linked command handling code after Eric is ready with
76 * the high level code.
79 #if (NDEBUG & NDEBUG_LISTS)
81 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
82 if ((x)==(y)) udelay(5); }
83 #define REMOVE(w,x,y,z) \
84 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
85 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
86 if ((x)==(y)) udelay(5); }
89 #define REMOVE(w,x,y,z)
100 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
101 * and specifically for each board rather than each chip. This makes their
102 * adaptation to platforms like the Mac (Some of which use NCR5380's)
103 * more difficult than it has to be.
105 * Also, many of the SCSI drivers were written before the command queuing
106 * routines were implemented, meaning their implementations of queued
107 * commands were hacked on rather than designed in from the start.
109 * When I designed the Linux SCSI drivers I figured that
110 * while having two different SCSI boards in a system might be useful
111 * for debugging things, two of the same type wouldn't be used.
112 * Well, I was wrong and a number of users have mailed me about running
113 * multiple high-performance SCSI boards in a server.
115 * Finally, when I get questions from users, I have no idea what
116 * revision of my driver they are running.
118 * This driver attempts to address these problems :
119 * This is a generic 5380 driver. To use it on a different platform,
120 * one simply writes appropriate system specific macros (ie, data
121 * transfer - some PC's will use the I/O bus, 68K's must use
122 * memory mapped) and drops this file in their 'C' wrapper.
124 * As far as command queueing, two queues are maintained for
125 * each 5380 in the system - commands that haven't been issued yet,
126 * and commands that are currently executing. This means that an
127 * unlimited number of commands may be queued, letting
128 * more commands propagate from the higher driver levels giving higher
129 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
130 * allowing multiple commands to propagate all the way to a SCSI-II device
131 * while a command is already executing.
133 * To solve the multiple-boards-in-the-same-system problem,
134 * there is a separate instance structure for each instance
135 * of a 5380 in the system. So, multiple NCR5380 drivers will
136 * be able to coexist with appropriate changes to the high level
139 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
140 * number (updated for each public release) printed by the
141 * NCR5380_print_options command, which should be called from the
142 * wrapper detect function, so that I know what release of the driver
145 * Issues specific to the NCR5380 :
147 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
148 * piece of hardware that requires you to sit in a loop polling for
149 * the REQ signal as long as you are connected. Some devices are
150 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
151 * while doing long seek operations.
153 * The workaround for this is to keep track of devices that have
154 * disconnected. If the device hasn't disconnected, for commands that
155 * should disconnect, we do something like
157 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
159 * Some tweaking of N and M needs to be done. An algorithm based
160 * on "time to data" would give the best results as long as short time
161 * to datas (ie, on the same track) were considered, however these
162 * broken devices are the exception rather than the rule and I'd rather
163 * spend my time optimizing for the normal case.
167 * At the heart of the design is a coroutine, NCR5380_main,
168 * which is started when not running by the interrupt handler,
169 * timer, and queue command function. It attempts to establish
170 * I_T_L or I_T_L_Q nexuses by removing the commands from the
171 * issue queue and calling NCR5380_select() if a nexus
172 * is not established.
174 * Once a nexus is established, the NCR5380_information_transfer()
175 * phase goes through the various phases as instructed by the target.
176 * if the target goes into MSG IN and sends a DISCONNECT message,
177 * the command structure is placed into the per instance disconnected
178 * queue, and NCR5380_main tries to find more work. If USLEEP
179 * was defined, and the target is idle for too long, the system
182 * If a command has disconnected, eventually an interrupt will trigger,
183 * calling NCR5380_intr() which will in turn call NCR5380_reselect
184 * to reestablish a nexus. This will run main if necessary.
186 * On command termination, the done function will be called as
189 * SCSI pointers are maintained in the SCp field of SCSI command
190 * structures, being initialized after the command is connected
191 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
192 * Note that in violation of the standard, an implicit SAVE POINTERS operation
193 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
198 * This file a skeleton Linux SCSI driver for the NCR 5380 series
199 * of chips. To use it, you write an architecture specific functions
200 * and macros and include this file in your driver.
202 * These macros control options :
203 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
204 * for commands that return with a CHECK CONDITION status.
206 * LINKED - if defined, linked commands are supported.
208 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
210 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
212 * These macros MUST be defined :
214 * NCR5380_read(register) - read from the specified register
216 * NCR5380_write(register, value) - write to the specific register
218 * Either real DMA *or* pseudo DMA may be implemented
220 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
221 * Note that the DMA setup functions should return the number of bytes
222 * that they were able to program the controller for.
224 * Also note that generic i386/PC versions of these macros are
225 * available as NCR5380_i386_dma_write_setup,
226 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
228 * NCR5380_dma_write_setup(instance, src, count) - initialize
229 * NCR5380_dma_read_setup(instance, dst, count) - initialize
230 * NCR5380_dma_residual(instance); - residual count
233 * NCR5380_pwrite(instance, src, count)
234 * NCR5380_pread(instance, dst, count);
236 * If nothing specific to this implementation needs doing (ie, with external
237 * hardware), you must also define
239 * NCR5380_queue_command
244 * to be the global entry points into the specific driver, ie
245 * #define NCR5380_queue_command t128_queue_command.
247 * If this is not done, the routines will be defined as static functions
248 * with the NCR5380* names and the user must provide a globally
249 * accessible wrapper function.
251 * The generic driver is initialized by calling NCR5380_init(instance),
252 * after setting the appropriate host specific fields and ID. If the
253 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
254 * possible) function may be used. Before the specific driver initialization
255 * code finishes, NCR5380_print_options should be called.
258 static struct Scsi_Host
*first_instance
= NULL
;
259 static 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 NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
270 #define HOSTNO instance->host_no
271 #define H_NO(cmd) (cmd)->device->host->host_no
273 #define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \
279 * Functions for handling tagged queuing
280 * =====================================
282 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
284 * Using consecutive numbers for the tags is no good idea in my eyes. There
285 * could be wrong re-usings if the counter (8 bit!) wraps and some early
286 * command has been preempted for a long time. My solution: a bitfield for
287 * remembering used tags.
289 * There's also the problem that each target has a certain queue size, but we
290 * cannot know it in advance :-( We just see a QUEUE_FULL status being
291 * returned. So, in this case, the driver internal queue size assumption is
292 * reduced to the number of active tags if QUEUE_FULL is returned by the
293 * target. The command is returned to the mid-level, but with status changed
294 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
297 * We're also not allowed running tagged commands as long as an untagged
298 * command is active. And REQUEST SENSE commands after a contingent allegiance
299 * condition _must_ be untagged. To keep track whether an untagged command has
300 * been issued, the host->busy array is still employed, as it is without
301 * support for tagged queuing.
303 * One could suspect that there are possible race conditions between
304 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
305 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
306 * which already guaranteed to be running at most once. It is also the only
307 * place where tags/LUNs are allocated. So no other allocation can slip
308 * between that pair, there could only happen a reselection, which can free a
309 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
310 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
313 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
315 #define TAG_NONE 0xff
317 /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
318 #if (MAX_TAGS % 32) != 0
319 #error "MAX_TAGS must be a multiple of 32!"
323 char allocated
[MAX_TAGS
/8];
328 static TAG_ALLOC TagAlloc
[8][8]; /* 8 targets and 8 LUNs */
331 static void __init
init_tags( void )
336 if (!setup_use_tagged_queuing
)
339 for( target
= 0; target
< 8; ++target
) {
340 for( lun
= 0; lun
< 8; ++lun
) {
341 ta
= &TagAlloc
[target
][lun
];
342 memset( &ta
->allocated
, 0, MAX_TAGS
/8 );
343 ta
->nr_allocated
= 0;
344 /* At the beginning, assume the maximum queue size we could
345 * support (MAX_TAGS). This value will be decreased if the target
346 * returns QUEUE_FULL status.
348 ta
->queue_size
= MAX_TAGS
;
354 /* Check if we can issue a command to this LUN: First see if the LUN is marked
355 * busy by an untagged command. If the command should use tagged queuing, also
356 * check that there is a free tag and the target's queue won't overflow. This
357 * function should be called with interrupts disabled to avoid race
361 static int is_lun_busy( Scsi_Cmnd
*cmd
, int should_be_tagged
)
363 SETUP_HOSTDATA(cmd
->device
->host
);
365 if (hostdata
->busy
[cmd
->device
->id
] & (1 << cmd
->device
->lun
))
367 if (!should_be_tagged
||
368 !setup_use_tagged_queuing
|| !cmd
->device
->tagged_supported
)
370 if (TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
].nr_allocated
>=
371 TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
].queue_size
) {
372 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
373 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
380 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
381 * must be called before!), or reserve the LUN in 'busy' if the command is
385 static void cmd_get_tag( Scsi_Cmnd
*cmd
, int should_be_tagged
)
387 SETUP_HOSTDATA(cmd
->device
->host
);
389 /* If we or the target don't support tagged queuing, allocate the LUN for
390 * an untagged command.
392 if (!should_be_tagged
||
393 !setup_use_tagged_queuing
|| !cmd
->device
->tagged_supported
) {
395 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
396 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
397 "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
, cmd
->device
->lun
,
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
);
426 else if (cmd
->tag
>= MAX_TAGS
) {
427 printk(KERN_NOTICE
"scsi%d: trying to free bad tag %d!\n",
428 H_NO(cmd
), cmd
->tag
);
431 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
];
432 clear_bit( cmd
->tag
, &ta
->allocated
);
434 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
435 H_NO(cmd
), cmd
->tag
, cmd
->device
->id
, cmd
->device
->lun
);
440 static void free_all_tags( void )
445 if (!setup_use_tagged_queuing
)
448 for( target
= 0; target
< 8; ++target
) {
449 for( lun
= 0; lun
< 8; ++lun
) {
450 ta
= &TagAlloc
[target
][lun
];
451 memset( &ta
->allocated
, 0, MAX_TAGS
/8 );
452 ta
->nr_allocated
= 0;
457 #endif /* SUPPORT_TAGS */
461 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
463 * Purpose: Try to merge several scatter-gather requests into one DMA
464 * transfer. This is possible if the scatter buffers lie on
465 * physical contiguous addresses.
467 * Parameters: Scsi_Cmnd *cmd
468 * The command to work on. The first scatter buffer's data are
469 * assumed to be already transfered into ptr/this_residual.
472 static void merge_contiguous_buffers( Scsi_Cmnd
*cmd
)
474 unsigned long endaddr
;
475 #if (NDEBUG & NDEBUG_MERGING)
476 unsigned long oldlen
= cmd
->SCp
.this_residual
;
480 for (endaddr
= virt_to_phys(cmd
->SCp
.ptr
+ cmd
->SCp
.this_residual
- 1) + 1;
481 cmd
->SCp
.buffers_residual
&&
482 virt_to_phys(SGADDR(&(cmd
->SCp
.buffer
[1]))) == endaddr
; ) {
484 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
485 SGADDR(&(cmd
->SCp
.buffer
[1])), endaddr
);
486 #if (NDEBUG & NDEBUG_MERGING)
490 --cmd
->SCp
.buffers_residual
;
491 cmd
->SCp
.this_residual
+= cmd
->SCp
.buffer
->length
;
492 endaddr
+= cmd
->SCp
.buffer
->length
;
494 #if (NDEBUG & NDEBUG_MERGING)
495 if (oldlen
!= cmd
->SCp
.this_residual
)
496 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
497 cnt
, cmd
->SCp
.ptr
, cmd
->SCp
.this_residual
);
502 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
504 * Purpose : initialize the saved data pointers for cmd to point to the
505 * start of the buffer.
507 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
510 static __inline__
void initialize_SCp(Scsi_Cmnd
*cmd
)
513 * Initialize the Scsi Pointer field so that all of the commands in the
514 * various queues are valid.
518 cmd
->SCp
.buffer
= (struct scatterlist
*) cmd
->buffer
;
519 cmd
->SCp
.buffers_residual
= cmd
->use_sg
- 1;
520 cmd
->SCp
.ptr
= (char *) SGADDR(cmd
->SCp
.buffer
);
521 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
523 /* ++roman: Try to merge some scatter-buffers if they are at
524 * contiguous physical addresses.
526 // merge_contiguous_buffers( cmd );
528 cmd
->SCp
.buffer
= NULL
;
529 cmd
->SCp
.buffers_residual
= 0;
530 cmd
->SCp
.ptr
= (char *) cmd
->request_buffer
;
531 cmd
->SCp
.this_residual
= cmd
->request_bufflen
;
536 #include <linux/config.h>
537 #include <linux/delay.h>
543 signals
[] = {{ SR_DBP
, "PARITY"}, { SR_RST
, "RST" }, { SR_BSY
, "BSY" },
544 { SR_REQ
, "REQ" }, { SR_MSG
, "MSG" }, { SR_CD
, "CD" }, { SR_IO
, "IO" },
545 { SR_SEL
, "SEL" }, {0, NULL
}},
546 basrs
[] = {{BASR_ATN
, "ATN"}, {BASR_ACK
, "ACK"}, {0, NULL
}},
547 icrs
[] = {{ICR_ASSERT_RST
, "ASSERT RST"},{ICR_ASSERT_ACK
, "ASSERT ACK"},
548 {ICR_ASSERT_BSY
, "ASSERT BSY"}, {ICR_ASSERT_SEL
, "ASSERT SEL"},
549 {ICR_ASSERT_ATN
, "ASSERT ATN"}, {ICR_ASSERT_DATA
, "ASSERT DATA"},
551 mrs
[] = {{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"},
559 * Function : void NCR5380_print(struct Scsi_Host *instance)
561 * Purpose : print the SCSI bus signals for debugging purposes
563 * Input : instance - which NCR5380
566 static void NCR5380_print(struct Scsi_Host
*instance
) {
567 unsigned char status
, data
, basr
, mr
, icr
, i
;
570 local_irq_save(flags
);
571 data
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
572 status
= NCR5380_read(STATUS_REG
);
573 mr
= NCR5380_read(MODE_REG
);
574 icr
= NCR5380_read(INITIATOR_COMMAND_REG
);
575 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
576 local_irq_restore(flags
);
577 printk("STATUS_REG: %02x ", status
);
578 for (i
= 0; signals
[i
].mask
; ++i
)
579 if (status
& signals
[i
].mask
)
580 printk(",%s", signals
[i
].name
);
581 printk("\nBASR: %02x ", basr
);
582 for (i
= 0; basrs
[i
].mask
; ++i
)
583 if (basr
& basrs
[i
].mask
)
584 printk(",%s", basrs
[i
].name
);
585 printk("\nICR: %02x ", icr
);
586 for (i
= 0; icrs
[i
].mask
; ++i
)
587 if (icr
& icrs
[i
].mask
)
588 printk(",%s", icrs
[i
].name
);
589 printk("\nMODE: %02x ", mr
);
590 for (i
= 0; mrs
[i
].mask
; ++i
)
591 if (mr
& mrs
[i
].mask
)
592 printk(",%s", mrs
[i
].name
);
600 {PHASE_DATAOUT
, "DATAOUT"}, {PHASE_DATAIN
, "DATAIN"}, {PHASE_CMDOUT
, "CMDOUT"},
601 {PHASE_STATIN
, "STATIN"}, {PHASE_MSGOUT
, "MSGOUT"}, {PHASE_MSGIN
, "MSGIN"},
602 {PHASE_UNKNOWN
, "UNKNOWN"}};
605 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 * Purpose : print the current SCSI phase for debugging purposes
609 * Input : instance - which NCR5380
612 static void NCR5380_print_phase(struct Scsi_Host
*instance
)
614 unsigned char status
;
617 status
= NCR5380_read(STATUS_REG
);
618 if (!(status
& SR_REQ
))
619 printk(KERN_DEBUG
"scsi%d: REQ not asserted, phase unknown.\n", HOSTNO
);
621 for (i
= 0; (phases
[i
].value
!= PHASE_UNKNOWN
) &&
622 (phases
[i
].value
!= (status
& PHASE_MASK
)); ++i
);
623 printk(KERN_DEBUG
"scsi%d: phase %s\n", HOSTNO
, phases
[i
].name
);
630 __inline__
void NCR5380_print(struct Scsi_Host
*instance
) { };
631 __inline__
void NCR5380_print_phase(struct Scsi_Host
*instance
) { };
636 * ++roman: New scheme of calling NCR5380_main()
638 * If we're not in an interrupt, we can call our main directly, it cannot be
639 * already running. Else, we queue it on a task queue, if not 'main_running'
640 * tells us that a lower level is already executing it. This way,
641 * 'main_running' needs not be protected in a special way.
643 * queue_main() is a utility function for putting our main onto the task
644 * queue, if main_running is false. It should be called only from a
645 * interrupt or bottom half.
648 #include <linux/workqueue.h>
649 #include <linux/interrupt.h>
651 static volatile int main_running
= 0;
652 static DECLARE_WORK(NCR5380_tqueue
, (void (*)(void*))NCR5380_main
, NULL
);
654 static __inline__
void queue_main(void)
657 /* If in interrupt and NCR5380_main() not already running,
658 queue it on the 'immediate' task queue, to be processed
659 immediately after the current interrupt processing has
661 schedule_work(&NCR5380_tqueue
);
663 /* else: nothing to do: the running NCR5380_main() will pick up
664 any newly queued command. */
668 static inline void NCR5380_all_init (void)
672 INI_PRINTK("scsi : NCR5380_all_init()\n");
679 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
681 * Purpose : called by probe code indicating the NCR5380 driver
682 * options that were selected.
684 * Inputs : instance, pointer to this instance. Unused.
687 static void __init
NCR5380_print_options (struct Scsi_Host
*instance
)
689 printk(" generic options"
700 " SCSI-2 TAGGED QUEUING"
703 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE
);
707 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
709 * Purpose : print commands in the various queues, called from
710 * NCR5380_abort and NCR5380_debug to aid debugging.
712 * Inputs : instance, pointer to this instance.
715 static void NCR5380_print_status (struct Scsi_Host
*instance
)
721 NCR_PRINT(NDEBUG_ANY
);
722 NCR_PRINT_PHASE(NDEBUG_ANY
);
724 pr_bfr
= (char *) __get_free_page(GFP_ATOMIC
);
726 printk("NCR5380_print_status: no memory for print buffer\n");
729 len
= NCR5380_proc_info(instance
, pr_bfr
, &start
, 0, PAGE_SIZE
, 0);
731 printk("\n%s\n", pr_bfr
);
732 free_page((unsigned long) pr_bfr
);
736 /******************************************/
738 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
740 * *buffer: I/O buffer
741 * **start: if inout == FALSE pointer into buffer where user read should start
742 * offset: current offset
743 * length: length of buffer
744 * hostno: Scsi_Host host_no
745 * inout: TRUE - user is writing; FALSE - user is reading
747 * Return the number of bytes read from or written
751 #define SPRINTF(fmt,args...) \
752 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
753 pos += sprintf(pos, fmt , ## args); } while(0)
755 char *lprint_Scsi_Cmnd (Scsi_Cmnd
*cmd
, char *pos
, char *buffer
, int length
);
757 static int NCR5380_proc_info (struct Scsi_Host
*instance
, char *buffer
, char **start
,
758 off_t offset
, int length
, int inout
)
761 struct NCR5380_hostdata
*hostdata
;
765 #define check_offset() \
767 if (pos - buffer < offset - begin) { \
768 begin += pos - buffer; \
773 hostdata
= (struct NCR5380_hostdata
*)instance
->hostdata
;
775 if (inout
) { /* Has data been written to the file ? */
776 return(-ENOSYS
); /* Currently this is a no-op */
778 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE
);
780 local_irq_save(flags
);
781 SPRINTF("NCR5380: coroutine is%s running.\n", main_running
? "" : "n't");
783 if (!hostdata
->connected
)
784 SPRINTF("scsi%d: no currently connected command\n", HOSTNO
);
786 pos
= lprint_Scsi_Cmnd ((Scsi_Cmnd
*) hostdata
->connected
,
787 pos
, buffer
, length
);
788 SPRINTF("scsi%d: issue_queue\n", HOSTNO
);
790 for (ptr
= (Scsi_Cmnd
*) hostdata
->issue_queue
; ptr
; ptr
= NEXT(ptr
)) {
791 pos
= lprint_Scsi_Cmnd (ptr
, pos
, buffer
, length
);
795 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO
);
797 for (ptr
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; ptr
;
799 pos
= lprint_Scsi_Cmnd (ptr
, pos
, buffer
, length
);
803 local_irq_restore(flags
);
804 *start
= buffer
+ (offset
- begin
);
805 if (pos
- buffer
< offset
- begin
)
807 else if (pos
- buffer
- (offset
- begin
) < length
)
808 return pos
- buffer
- (offset
- begin
);
813 lprint_Scsi_Cmnd (Scsi_Cmnd
*cmd
, char *pos
, char *buffer
, int length
)
816 unsigned char *command
;
817 SPRINTF("scsi%d: destination target %d, lun %d\n",
818 H_NO(cmd
), cmd
->device
->id
, cmd
->device
->lun
);
819 SPRINTF(" command = ");
821 SPRINTF("%2d (0x%02x)", command
[0], command
[0]);
822 for (i
= 1, s
= COMMAND_SIZE(command
[0]); i
< s
; ++i
)
823 SPRINTF(" %02x", command
[i
]);
830 * Function : void NCR5380_init (struct Scsi_Host *instance)
832 * Purpose : initializes *instance and corresponding 5380 chip.
834 * Inputs : instance - instantiation of the 5380 driver.
836 * Notes : I assume that the host, hostno, and id bits have been
837 * set correctly. I don't care about the irq and other fields.
841 static int NCR5380_init (struct Scsi_Host
*instance
, int flags
)
844 SETUP_HOSTDATA(instance
);
848 hostdata
->aborted
= 0;
849 hostdata
->id_mask
= 1 << instance
->this_id
;
850 hostdata
->id_higher_mask
= 0;
851 for (i
= hostdata
->id_mask
; i
<= 0x80; i
<<= 1)
852 if (i
> hostdata
->id_mask
)
853 hostdata
->id_higher_mask
|= i
;
854 for (i
= 0; i
< 8; ++i
)
855 hostdata
->busy
[i
] = 0;
859 #if defined (REAL_DMA)
860 hostdata
->dma_len
= 0;
862 hostdata
->targets_present
= 0;
863 hostdata
->connected
= NULL
;
864 hostdata
->issue_queue
= NULL
;
865 hostdata
->disconnected_queue
= NULL
;
866 hostdata
->flags
= FLAG_CHECK_LAST_BYTE_SENT
;
869 the_template
= instance
->hostt
;
870 first_instance
= instance
;
875 if ((instance
->cmd_per_lun
> 1) || (instance
->can_queue
> 1))
876 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
877 " without AUTOSENSE option, contingent allegiance conditions may\n"
878 " be incorrectly cleared.\n", HOSTNO
);
879 #endif /* def AUTOSENSE */
881 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
882 NCR5380_write(MODE_REG
, MR_BASE
);
883 NCR5380_write(TARGET_COMMAND_REG
, 0);
884 NCR5380_write(SELECT_ENABLE_REG
, 0);
890 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
891 * void (*done)(Scsi_Cmnd *))
893 * Purpose : enqueues a SCSI command
895 * Inputs : cmd - SCSI command, done - function called on completion, with
896 * a pointer to the command descriptor.
901 * cmd is added to the per instance issue_queue, with minor
902 * twiddling done to the host specific fields of cmd. If the
903 * main coroutine is not running, it is restarted.
907 /* Only make static if a wrapper function is used */
908 static int NCR5380_queue_command (Scsi_Cmnd
*cmd
, void (*done
)(Scsi_Cmnd
*))
910 SETUP_HOSTDATA(cmd
->device
->host
);
914 #if (NDEBUG & NDEBUG_NO_WRITE)
915 switch (cmd
->cmnd
[0]) {
918 printk(KERN_NOTICE
"scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
920 cmd
->result
= (DID_ERROR
<< 16);
924 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
929 if (!hostdata
->connected
&& !hostdata
->issue_queue
&&
930 !hostdata
->disconnected_queue
) {
931 hostdata
->timebase
= jiffies
;
934 # ifdef NCR5380_STAT_LIMIT
935 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
937 switch (cmd
->cmnd
[0])
942 hostdata
->time_write
[cmd
->device
->id
] -= (jiffies
- hostdata
->timebase
);
943 hostdata
->bytes_write
[cmd
->device
->id
] += cmd
->request_bufflen
;
944 hostdata
->pendingw
++;
949 hostdata
->time_read
[cmd
->device
->id
] -= (jiffies
- hostdata
->timebase
);
950 hostdata
->bytes_read
[cmd
->device
->id
] += cmd
->request_bufflen
;
951 hostdata
->pendingr
++;
957 * We use the host_scribble field as a pointer to the next command
962 cmd
->scsi_done
= done
;
968 * Insert the cmd into the issue queue. Note that REQUEST SENSE
969 * commands are added to the head of the queue since any command will
970 * clear the contingent allegiance condition that exists and the
971 * sense data is only guaranteed to be valid while the condition exists.
974 local_irq_save(flags
);
975 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
976 * Otherwise a running NCR5380_main may steal the lock.
977 * Lock before actually inserting due to fairness reasons explained in
978 * atari_scsi.c. If we insert first, then it's impossible for this driver
979 * to release the lock.
980 * Stop timer for this command while waiting for the lock, or timeouts
981 * may happen (and they really do), and it's no good if the command doesn't
982 * appear in any of the queues.
983 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
984 * because also a timer int can trigger an abort or reset, which would
985 * alter queues and touch the lock.
987 if (!(hostdata
->issue_queue
) || (cmd
->cmnd
[0] == REQUEST_SENSE
)) {
988 LIST(cmd
, hostdata
->issue_queue
);
989 NEXT(cmd
) = hostdata
->issue_queue
;
990 hostdata
->issue_queue
= cmd
;
992 for (tmp
= (Scsi_Cmnd
*)hostdata
->issue_queue
;
993 NEXT(tmp
); tmp
= NEXT(tmp
))
999 local_irq_restore(flags
);
1001 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd
),
1002 (cmd
->cmnd
[0] == REQUEST_SENSE
) ? "head" : "tail");
1004 /* If queue_command() is called from an interrupt (real one or bottom
1005 * half), we let queue_main() do the job of taking care about main. If it
1006 * is already running, this is a no-op, else main will be queued.
1008 * If we're not in an interrupt, we can call NCR5380_main()
1009 * unconditionally, because it cannot be already running.
1011 if (in_interrupt() || ((flags
>> 8) & 7) >= 6)
1019 * Function : NCR5380_main (void)
1021 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1022 * be done on the NCR5380 host adapters in a system. Both
1023 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1024 * in case it is not running.
1026 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1027 * reenable them. This prevents reentrancy and kernel stack overflow.
1030 static void NCR5380_main (void *bl
)
1032 Scsi_Cmnd
*tmp
, *prev
;
1033 struct Scsi_Host
*instance
= first_instance
;
1034 struct NCR5380_hostdata
*hostdata
= HOSTDATA(instance
);
1036 unsigned long flags
;
1039 * We run (with interrupts disabled) until we're sure that none of
1040 * the host adapters have anything that can be done, at which point
1041 * we set main_running to 0 and exit.
1043 * Interrupts are enabled before doing various other internal
1044 * instructions, after we've decided that we need to run through
1047 * this should prevent any race conditions.
1049 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1050 * because also a timer int can trigger an abort or reset, which can
1051 * alter queues and touch the Falcon lock.
1054 /* Tell int handlers main() is now already executing. Note that
1055 no races are possible here. If an int comes in before
1056 'main_running' is set here, and queues/executes main via the
1057 task queue, it doesn't do any harm, just this instance of main
1058 won't find any work left to do. */
1063 local_save_flags(flags
);
1065 local_irq_disable(); /* Freeze request queues */
1068 if (!hostdata
->connected
) {
1069 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO
);
1071 * Search through the issue_queue for a command destined
1072 * for a target that's not busy.
1074 #if (NDEBUG & NDEBUG_LISTS)
1075 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
, prev
= NULL
;
1076 tmp
&& (tmp
!= prev
); prev
= tmp
, tmp
= NEXT(tmp
))
1078 if ((tmp
== prev
) && tmp
) printk(" LOOP\n");/* else printk("\n");*/
1080 for (tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
,
1081 prev
= NULL
; tmp
; prev
= tmp
, tmp
= NEXT(tmp
) ) {
1083 #if (NDEBUG & NDEBUG_LISTS)
1085 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1086 tmp
, tmp
->target
, hostdata
->busy
[tmp
->target
],
1089 /* When we find one, remove it from the issue queue. */
1090 /* ++guenther: possible race with Falcon locking */
1093 !is_lun_busy( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
)
1095 !(hostdata
->busy
[tmp
->device
->id
] & (1 << tmp
->device
->lun
))
1098 /* ++guenther: just to be sure, this must be atomic */
1099 local_irq_disable();
1101 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
1102 NEXT(prev
) = NEXT(tmp
);
1104 REMOVE(-1, hostdata
->issue_queue
, tmp
, NEXT(tmp
));
1105 hostdata
->issue_queue
= NEXT(tmp
);
1109 /* reenable interrupts after finding one */
1110 local_irq_restore(flags
);
1113 * Attempt to establish an I_T_L nexus here.
1114 * On success, instance->hostdata->connected is set.
1115 * On failure, we must add the command back to the
1116 * issue queue so we can keep trying.
1118 MAIN_PRINTK("scsi%d: main(): command for target %d "
1119 "lun %d removed from issue_queue\n",
1120 HOSTNO
, tmp
->target
, tmp
->lun
);
1122 * REQUEST SENSE commands are issued without tagged
1123 * queueing, even on SCSI-II devices because the
1124 * contingent allegiance condition exists for the
1127 /* ++roman: ...and the standard also requires that
1128 * REQUEST SENSE command are untagged.
1132 cmd_get_tag( tmp
, tmp
->cmnd
[0] != REQUEST_SENSE
);
1134 if (!NCR5380_select(instance
, tmp
,
1135 (tmp
->cmnd
[0] == REQUEST_SENSE
) ? TAG_NONE
:
1139 local_irq_disable();
1140 LIST(tmp
, hostdata
->issue_queue
);
1141 NEXT(tmp
) = hostdata
->issue_queue
;
1142 hostdata
->issue_queue
= tmp
;
1144 cmd_free_tag( tmp
);
1146 local_irq_restore(flags
);
1147 MAIN_PRINTK("scsi%d: main(): select() failed, "
1148 "returned to issue_queue\n", HOSTNO
);
1149 if (hostdata
->connected
)
1152 } /* if target/lun/target queue is not busy */
1153 } /* for issue_queue */
1154 } /* if (!hostdata->connected) */
1155 if (hostdata
->connected
1157 && !hostdata
->dma_len
1160 local_irq_restore(flags
);
1161 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1163 NCR5380_information_transfer(instance
);
1164 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO
);
1169 /* Better allow ints _after_ 'main_running' has been cleared, else
1170 an interrupt could believe we'll pick up the work it left for
1171 us, but we won't see it anymore here... */
1173 local_irq_restore(flags
);
1179 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1181 * Purpose : Called by interrupt handler when DMA finishes or a phase
1182 * mismatch occurs (which would finish the DMA transfer).
1184 * Inputs : instance - this instance of the NCR5380.
1188 static void NCR5380_dma_complete( struct Scsi_Host
*instance
)
1190 SETUP_HOSTDATA(instance
);
1192 unsigned char **data
;
1193 volatile int *count
;
1195 if (!hostdata
->connected
) {
1196 printk(KERN_WARNING
"scsi%d: received end of DMA interrupt with "
1197 "no connected cmd\n", HOSTNO
);
1201 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1202 HOSTNO
, NCR5380_read(BUS_AND_STATUS_REG
),
1203 NCR5380_read(STATUS_REG
));
1205 if((sun3scsi_dma_finish(rq_data_dir(hostdata
->connected
->request
)))) {
1206 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO
);
1207 printk("please e-mail sammy@sammy.net with a description of how this\n");
1208 printk("error was produced.\n");
1212 /* make sure we're not stuck in a data phase */
1213 if((NCR5380_read(BUS_AND_STATUS_REG
) & (BASR_PHASE_MATCH
|
1215 (BASR_PHASE_MATCH
| BASR_ACK
)) {
1216 printk("scsi%d: BASR %02x\n", HOSTNO
, NCR5380_read(BUS_AND_STATUS_REG
));
1217 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1218 "overrun!\n", HOSTNO
);
1219 printk("not prepared for this error!\n");
1220 printk("please e-mail sammy@sammy.net with a description of how this\n");
1221 printk("error was produced.\n");
1227 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1228 NCR5380_write(MODE_REG
, MR_BASE
);
1229 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1231 transfered
= hostdata
->dma_len
- NCR5380_dma_residual(instance
);
1232 hostdata
->dma_len
= 0;
1234 data
= (unsigned char **) &(hostdata
->connected
->SCp
.ptr
);
1235 count
= &(hostdata
->connected
->SCp
.this_residual
);
1236 *data
+= transfered
;
1237 *count
-= transfered
;
1240 #endif /* REAL_DMA */
1244 * Function : void NCR5380_intr (int irq)
1246 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1247 * from the disconnected queue, and restarting NCR5380_main()
1250 * Inputs : int irq, irq that caused this interrupt.
1254 static irqreturn_t
NCR5380_intr (int irq
, void *dev_id
, struct pt_regs
*regs
)
1256 struct Scsi_Host
*instance
= first_instance
;
1257 int done
= 1, handled
= 0;
1260 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO
);
1262 /* Look for pending interrupts */
1263 basr
= NCR5380_read(BUS_AND_STATUS_REG
);
1264 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO
, basr
);
1265 /* dispatch to appropriate routine if found and done=0 */
1266 if (basr
& BASR_IRQ
) {
1267 NCR_PRINT(NDEBUG_INTR
);
1268 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
|SR_IO
)) == (SR_SEL
|SR_IO
)) {
1271 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO
);
1272 NCR5380_reselect(instance
);
1273 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1275 else if (basr
& BASR_PARITY_ERROR
) {
1276 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO
);
1277 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1279 else if ((NCR5380_read(STATUS_REG
) & SR_RST
) == SR_RST
) {
1280 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO
);
1281 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1285 * The rest of the interrupt conditions can occur only during a
1289 #if defined(REAL_DMA)
1291 * We should only get PHASE MISMATCH and EOP interrupts if we have
1292 * DMA enabled, so do a sanity check based on the current setting
1293 * of the MODE register.
1296 if ((NCR5380_read(MODE_REG
) & MR_DMA_MODE
) &&
1297 ((basr
& BASR_END_DMA_TRANSFER
) ||
1298 !(basr
& BASR_PHASE_MATCH
))) {
1300 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO
);
1301 NCR5380_dma_complete( instance
);
1305 #endif /* REAL_DMA */
1307 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1308 if (basr
& BASR_PHASE_MATCH
)
1309 INT_PRINTK("scsi%d: unknown interrupt, "
1310 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1311 HOSTNO
, basr
, NCR5380_read(MODE_REG
),
1312 NCR5380_read(STATUS_REG
));
1313 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1314 #ifdef SUN3_SCSI_VME
1315 dregs
->csr
|= CSR_DMA_ENABLE
;
1318 } /* if !(SELECTION || PARITY) */
1323 printk(KERN_NOTICE
"scsi%d: interrupt without IRQ bit set in BASR, "
1324 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO
, basr
,
1325 NCR5380_read(MODE_REG
), NCR5380_read(STATUS_REG
));
1326 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1327 #ifdef SUN3_SCSI_VME
1328 dregs
->csr
|= CSR_DMA_ENABLE
;
1333 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO
);
1334 /* Put a call to NCR5380_main() on the queue... */
1337 return IRQ_RETVAL(handled
);
1340 #ifdef NCR5380_STATS
1341 static void collect_stats(struct NCR5380_hostdata
* hostdata
, Scsi_Cmnd
* cmd
)
1343 # ifdef NCR5380_STAT_LIMIT
1344 if (cmd
->request_bufflen
> NCR5380_STAT_LIMIT
)
1346 switch (cmd
->cmnd
[0])
1351 hostdata
->time_write
[cmd
->device
->id
] += (jiffies
- hostdata
->timebase
);
1352 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
1353 hostdata
->pendingw
--;
1358 hostdata
->time_read
[cmd
->device
->id
] += (jiffies
- hostdata
->timebase
);
1359 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
1360 hostdata
->pendingr
--;
1367 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1370 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1371 * including ARBITRATION, SELECTION, and initial message out for
1372 * IDENTIFY and queue messages.
1374 * Inputs : instance - instantiation of the 5380 driver on which this
1375 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1376 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1377 * the command that is presently connected.
1379 * Returns : -1 if selection could not execute for some reason,
1380 * 0 if selection succeeded or failed because the target
1384 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1385 * with registers as they should have been on entry - ie
1386 * SELECT_ENABLE will be set appropriately, the NCR5380
1387 * will cease to drive any SCSI bus signals.
1389 * If successful : I_T_L or I_T_L_Q nexus will be established,
1390 * instance->connected will be set to cmd.
1391 * SELECT interrupt will be disabled.
1393 * If failed (no target) : cmd->scsi_done() will be called, and the
1394 * cmd->result host byte set to DID_BAD_TARGET.
1397 static int NCR5380_select (struct Scsi_Host
*instance
, Scsi_Cmnd
*cmd
, int tag
)
1399 SETUP_HOSTDATA(instance
);
1400 unsigned char tmp
[3], phase
;
1401 unsigned char *data
;
1403 unsigned long timeout
;
1404 unsigned long flags
;
1406 hostdata
->restart_select
= 0;
1407 NCR_PRINT(NDEBUG_ARBITRATION
);
1408 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO
,
1412 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1413 * data bus during SELECTION.
1416 local_irq_save(flags
);
1417 if (hostdata
->connected
) {
1418 local_irq_restore(flags
);
1421 NCR5380_write(TARGET_COMMAND_REG
, 0);
1425 * Start arbitration.
1428 NCR5380_write(OUTPUT_DATA_REG
, hostdata
->id_mask
);
1429 NCR5380_write(MODE_REG
, MR_ARBITRATE
);
1431 local_irq_restore(flags
);
1433 /* Wait for arbitration logic to complete */
1436 unsigned long timeout
= jiffies
+ 2*NCR_TIMEOUT
;
1438 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
)
1439 && time_before(jiffies
, timeout
) && !hostdata
->connected
)
1441 if (time_after_eq(jiffies
, timeout
))
1443 printk("scsi : arbitration timeout at %d\n", __LINE__
);
1444 NCR5380_write(MODE_REG
, MR_BASE
);
1445 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1449 #else /* NCR_TIMEOUT */
1450 while (!(NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_PROGRESS
)
1451 && !hostdata
->connected
);
1454 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO
);
1456 if (hostdata
->connected
) {
1457 NCR5380_write(MODE_REG
, MR_BASE
);
1461 * The arbitration delay is 2.2us, but this is a minimum and there is
1462 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1463 * the integral nature of udelay().
1469 /* Check for lost arbitration */
1470 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1471 (NCR5380_read(CURRENT_SCSI_DATA_REG
) & hostdata
->id_higher_mask
) ||
1472 (NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1473 hostdata
->connected
) {
1474 NCR5380_write(MODE_REG
, MR_BASE
);
1475 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1480 /* after/during arbitration, BSY should be asserted.
1481 IBM DPES-31080 Version S31Q works now */
1482 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1483 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_SEL
|
1486 if ((NCR5380_read(INITIATOR_COMMAND_REG
) & ICR_ARBITRATION_LOST
) ||
1487 hostdata
->connected
) {
1488 NCR5380_write(MODE_REG
, MR_BASE
);
1489 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1490 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1496 * Again, bus clear + bus settle time is 1.2us, however, this is
1497 * a minimum so we'll udelay ceil(1.2)
1500 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1501 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1507 if (hostdata
->connected
) {
1508 NCR5380_write(MODE_REG
, MR_BASE
);
1509 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1513 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO
);
1516 * Now that we have won arbitration, start Selection process, asserting
1517 * the host and target ID's on the SCSI bus.
1520 NCR5380_write(OUTPUT_DATA_REG
, (hostdata
->id_mask
| (1 << cmd
->device
->id
)));
1523 * Raise ATN while SEL is true before BSY goes false from arbitration,
1524 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1525 * phase immediately after selection.
1528 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_BSY
|
1529 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1530 NCR5380_write(MODE_REG
, MR_BASE
);
1533 * Reselect interrupts must be turned off prior to the dropping of BSY,
1534 * otherwise we will trigger an interrupt.
1537 if (hostdata
->connected
) {
1538 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1542 NCR5380_write(SELECT_ENABLE_REG
, 0);
1545 * The initiator shall then wait at least two deskew delays and release
1548 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1551 NCR5380_write(INITIATOR_COMMAND_REG
, (ICR_BASE
| ICR_ASSERT_DATA
|
1552 ICR_ASSERT_ATN
| ICR_ASSERT_SEL
));
1555 * Something weird happens when we cease to drive BSY - looks
1556 * like the board/chip is letting us do another read before the
1557 * appropriate propagation delay has expired, and we're confusing
1558 * a BSY signal from ourselves as the target's response to SELECTION.
1560 * A small delay (the 'C++' frontend breaks the pipeline with an
1561 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1562 * tighter 'C' code breaks and requires this) solves the problem -
1563 * the 1 us delay is arbitrary, and only used because this delay will
1564 * be the same on other platforms and since it works here, it should
1567 * wingel suggests that this could be due to failing to wait
1573 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO
, cmd
->device
->id
);
1576 * The SCSI specification calls for a 250 ms timeout for the actual
1580 timeout
= jiffies
+ 25;
1583 * XXX very interesting - we're seeing a bounce where the BSY we
1584 * asserted is being reflected / still asserted (propagation delay?)
1585 * and it's detecting as true. Sigh.
1589 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1590 * IO while SEL is true. But again, there are some disks out the in the
1591 * world that do that nevertheless. (Somebody claimed that this announces
1592 * reselection capability of the target.) So we better skip that test and
1593 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1596 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) &
1599 if ((NCR5380_read(STATUS_REG
) & (SR_SEL
| SR_IO
)) ==
1601 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1602 NCR5380_reselect(instance
);
1603 printk (KERN_ERR
"scsi%d: reselection after won arbitration?\n",
1605 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1609 while (time_before(jiffies
, timeout
) && !(NCR5380_read(STATUS_REG
) & SR_BSY
));
1613 * No less than two deskew delays after the initiator detects the
1614 * BSY signal is true, it shall release the SEL signal and may
1615 * change the DATA BUS. -wingel
1620 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1622 if (!(NCR5380_read(STATUS_REG
) & SR_BSY
)) {
1623 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1624 if (hostdata
->targets_present
& (1 << cmd
->device
->id
)) {
1625 printk(KERN_ERR
"scsi%d: weirdness\n", HOSTNO
);
1626 if (hostdata
->restart_select
)
1627 printk(KERN_NOTICE
"\trestart select\n");
1628 NCR_PRINT(NDEBUG_ANY
);
1629 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1632 cmd
->result
= DID_BAD_TARGET
<< 16;
1633 #ifdef NCR5380_STATS
1634 collect_stats(hostdata
, cmd
);
1637 cmd_free_tag( cmd
);
1639 cmd
->scsi_done(cmd
);
1640 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1641 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO
);
1642 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
1646 hostdata
->targets_present
|= (1 << cmd
->device
->id
);
1649 * Since we followed the SCSI spec, and raised ATN while SEL
1650 * was true but before BSY was false during selection, the information
1651 * transfer phase should be a MESSAGE OUT phase so that we can send the
1654 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1655 * message (2 bytes) with a tag ID that we increment with every command
1656 * until it wraps back to 0.
1658 * XXX - it turns out that there are some broken SCSI-II devices,
1659 * which claim to support tagged queuing but fail when more than
1660 * some number of commands are issued at once.
1663 /* Wait for start of REQ/ACK handshake */
1664 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
));
1666 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1667 HOSTNO
, cmd
->device
->id
);
1668 tmp
[0] = IDENTIFY(1, cmd
->device
->lun
);
1671 if (cmd
->tag
!= TAG_NONE
) {
1672 tmp
[1] = hostdata
->last_message
= SIMPLE_QUEUE_TAG
;
1680 #endif /* SUPPORT_TAGS */
1682 /* Send message(s) */
1684 phase
= PHASE_MSGOUT
;
1685 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
1686 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO
);
1687 /* XXX need to handle errors here */
1688 hostdata
->connected
= cmd
;
1689 #ifndef SUPPORT_TAGS
1690 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
1692 #ifdef SUN3_SCSI_VME
1693 dregs
->csr
|= CSR_INTR
;
1695 initialize_SCp(cmd
);
1702 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1703 * unsigned char *phase, int *count, unsigned char **data)
1705 * Purpose : transfers data in given phase using polled I/O
1707 * Inputs : instance - instance of driver, *phase - pointer to
1708 * what phase is expected, *count - pointer to number of
1709 * bytes to transfer, **data - pointer to data pointer.
1711 * Returns : -1 when different phase is entered without transferring
1712 * maximum number of bytes, 0 if all bytes are transfered or exit
1715 * Also, *phase, *count, *data are modified in place.
1717 * XXX Note : handling for bus free may be useful.
1721 * Note : this code is not as quick as it could be, however it
1722 * IS 100% reliable, and for the actual data transfer where speed
1723 * counts, we will always do a pseudo DMA or DMA transfer.
1726 static int NCR5380_transfer_pio( struct Scsi_Host
*instance
,
1727 unsigned char *phase
, int *count
,
1728 unsigned char **data
)
1730 register unsigned char p
= *phase
, tmp
;
1731 register int c
= *count
;
1732 register unsigned char *d
= *data
;
1735 * The NCR5380 chip will only drive the SCSI bus when the
1736 * phase specified in the appropriate bits of the TARGET COMMAND
1737 * REGISTER match the STATUS REGISTER
1740 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(p
));
1744 * Wait for assertion of REQ, after which the phase bits will be
1747 while (!((tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
));
1749 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO
);
1751 /* Check for phase mismatch */
1752 if ((tmp
& PHASE_MASK
) != p
) {
1753 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO
);
1754 NCR_PRINT_PHASE(NDEBUG_PIO
);
1758 /* Do actual transfer from SCSI bus to / from memory */
1760 NCR5380_write(OUTPUT_DATA_REG
, *d
);
1762 *d
= NCR5380_read(CURRENT_SCSI_DATA_REG
);
1767 * The SCSI standard suggests that in MSGOUT phase, the initiator
1768 * should drop ATN on the last byte of the message phase
1769 * after REQ has been asserted for the handshake but before
1770 * the initiator raises ACK.
1774 if (!((p
& SR_MSG
) && c
> 1)) {
1775 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1777 NCR_PRINT(NDEBUG_PIO
);
1778 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1779 ICR_ASSERT_DATA
| ICR_ASSERT_ACK
);
1781 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1782 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
);
1783 NCR_PRINT(NDEBUG_PIO
);
1784 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
1785 ICR_ASSERT_DATA
| ICR_ASSERT_ATN
| ICR_ASSERT_ACK
);
1788 NCR_PRINT(NDEBUG_PIO
);
1789 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
1792 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
1794 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO
);
1797 * We have several special cases to consider during REQ/ACK handshaking :
1798 * 1. We were in MSGOUT phase, and we are on the last byte of the
1799 * message. ATN must be dropped as ACK is dropped.
1801 * 2. We are in a MSGIN phase, and we are on the last byte of the
1802 * message. We must exit with ACK asserted, so that the calling
1803 * code may raise ATN before dropping ACK to reject the message.
1805 * 3. ACK and ATN are clear and the target may proceed as normal.
1807 if (!(p
== PHASE_MSGIN
&& c
== 1)) {
1808 if (p
== PHASE_MSGOUT
&& c
> 1)
1809 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1811 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
1815 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO
, c
);
1819 tmp
= NCR5380_read(STATUS_REG
);
1820 /* The phase read from the bus is valid if either REQ is (already)
1821 * asserted or if ACK hasn't been released yet. The latter is the case if
1822 * we're in MSGIN and all wanted bytes have been received. */
1823 if ((tmp
& SR_REQ
) || (p
== PHASE_MSGIN
&& c
== 0))
1824 *phase
= tmp
& PHASE_MASK
;
1826 *phase
= PHASE_UNKNOWN
;
1828 if (!c
|| (*phase
== p
))
1835 * Function : do_abort (Scsi_Host *host)
1837 * Purpose : abort the currently established nexus. Should only be
1838 * called from a routine which can drop into a
1840 * Returns : 0 on success, -1 on failure.
1843 static int do_abort (struct Scsi_Host
*host
)
1845 unsigned char tmp
, *msgptr
, phase
;
1848 /* Request message out phase */
1849 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1852 * Wait for the target to indicate a valid phase by asserting
1853 * REQ. Once this happens, we'll have either a MSGOUT phase
1854 * and can immediately send the ABORT message, or we'll have some
1855 * other phase and will have to source/sink data.
1857 * We really don't care what value was on the bus or what value
1858 * the target sees, so we just handshake.
1861 while (!(tmp
= NCR5380_read(STATUS_REG
)) & SR_REQ
);
1863 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
1865 if ((tmp
& PHASE_MASK
) != PHASE_MSGOUT
) {
1866 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
1868 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
1869 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
);
1875 phase
= PHASE_MSGOUT
;
1876 NCR5380_transfer_pio (host
, &phase
, &len
, &msgptr
);
1879 * If we got here, and the command completed successfully,
1880 * we're about to go into bus free state.
1883 return len
? -1 : 0;
1886 #if defined(REAL_DMA)
1888 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1889 * unsigned char *phase, int *count, unsigned char **data)
1891 * Purpose : transfers data in given phase using either real
1894 * Inputs : instance - instance of driver, *phase - pointer to
1895 * what phase is expected, *count - pointer to number of
1896 * bytes to transfer, **data - pointer to data pointer.
1898 * Returns : -1 when different phase is entered without transferring
1899 * maximum number of bytes, 0 if all bytes or transfered or exit
1902 * Also, *phase, *count, *data are modified in place.
1907 static int NCR5380_transfer_dma( struct Scsi_Host
*instance
,
1908 unsigned char *phase
, int *count
,
1909 unsigned char **data
)
1911 SETUP_HOSTDATA(instance
);
1912 register int c
= *count
;
1913 register unsigned char p
= *phase
;
1914 unsigned long flags
;
1917 if(!sun3_dma_setup_done
) {
1918 printk("scsi%d: transfer_dma without setup!\n", HOSTNO
);
1921 hostdata
->dma_len
= c
;
1923 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1924 HOSTNO
, (p
& SR_IO
) ? "reading" : "writing",
1925 c
, (p
& SR_IO
) ? "to" : "from", *data
);
1927 /* netbsd turns off ints here, why not be safe and do it too */
1928 local_irq_save(flags
);
1930 /* send start chain */
1931 sun3scsi_dma_start(c
, *data
);
1934 NCR5380_write(TARGET_COMMAND_REG
, 1);
1935 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1936 NCR5380_write(INITIATOR_COMMAND_REG
, 0);
1937 NCR5380_write(MODE_REG
, (NCR5380_read(MODE_REG
) | MR_DMA_MODE
| MR_ENABLE_EOP_INTR
));
1938 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG
, 0);
1940 NCR5380_write(TARGET_COMMAND_REG
, 0);
1941 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
1942 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_ASSERT_DATA
);
1943 NCR5380_write(MODE_REG
, (NCR5380_read(MODE_REG
) | MR_DMA_MODE
| MR_ENABLE_EOP_INTR
));
1944 NCR5380_write(START_DMA_SEND_REG
, 0);
1947 #ifdef SUN3_SCSI_VME
1948 dregs
->csr
|= CSR_DMA_ENABLE
;
1951 local_irq_restore(flags
);
1953 sun3_dma_active
= 1;
1956 #endif /* defined(REAL_DMA) */
1959 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1961 * Purpose : run through the various SCSI phases and do as the target
1962 * directs us to. Operates on the currently connected command,
1963 * instance->connected.
1965 * Inputs : instance, instance for which we are doing commands
1967 * Side effects : SCSI things happen, the disconnected queue will be
1968 * modified if a command disconnects, *instance->connected will
1971 * XXX Note : we need to watch for bus free or a reset condition here
1972 * to recover from an unexpected bus free condition.
1975 static void NCR5380_information_transfer (struct Scsi_Host
*instance
)
1977 SETUP_HOSTDATA(instance
);
1978 unsigned long flags
;
1979 unsigned char msgout
= NOP
;
1982 #if defined(REAL_DMA)
1985 unsigned char *data
;
1986 unsigned char phase
, tmp
, extended_msg
[10], old_phase
=0xff;
1987 Scsi_Cmnd
*cmd
= (Scsi_Cmnd
*) hostdata
->connected
;
1989 #ifdef SUN3_SCSI_VME
1990 dregs
->csr
|= CSR_INTR
;
1994 tmp
= NCR5380_read(STATUS_REG
);
1995 /* We only have a valid SCSI phase when REQ is asserted */
1997 phase
= (tmp
& PHASE_MASK
);
1998 if (phase
!= old_phase
) {
2000 NCR_PRINT_PHASE(NDEBUG_INFORMATION
);
2003 if(phase
== PHASE_CMDOUT
) {
2005 unsigned long count
;
2007 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2008 count
= cmd
->SCp
.buffer
->length
;
2009 d
= SGADDR(cmd
->SCp
.buffer
);
2011 count
= cmd
->SCp
.this_residual
;
2015 /* this command setup for dma yet? */
2016 if((count
> SUN3_DMA_MINSIZE
) && (sun3_dma_setup_done
2019 if(cmd
->request
->flags
& REQ_CMD
) {
2020 sun3scsi_dma_setup(d
, count
,
2021 rq_data_dir(cmd
->request
));
2022 sun3_dma_setup_done
= cmd
;
2026 #ifdef SUN3_SCSI_VME
2027 dregs
->csr
|= CSR_INTR
;
2032 if (sink
&& (phase
!= PHASE_MSGOUT
)) {
2033 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(tmp
));
2035 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ATN
|
2037 while (NCR5380_read(STATUS_REG
) & SR_REQ
);
2038 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2046 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2047 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2048 "aborted\n", HOSTNO
);
2051 cmd
->result
= DID_ERROR
<< 16;
2057 * If there is no room left in the current buffer in the
2058 * scatter-gather list, move onto the next one.
2060 if (!cmd
->SCp
.this_residual
&& cmd
->SCp
.buffers_residual
) {
2062 --cmd
->SCp
.buffers_residual
;
2063 cmd
->SCp
.this_residual
= cmd
->SCp
.buffer
->length
;
2064 cmd
->SCp
.ptr
= SGADDR(cmd
->SCp
.buffer
);
2066 /* ++roman: Try to merge some scatter-buffers if
2067 * they are at contiguous physical addresses.
2069 // merge_contiguous_buffers( cmd );
2070 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2071 HOSTNO
, cmd
->SCp
.this_residual
,
2072 cmd
->SCp
.buffers_residual
);
2076 * The preferred transfer method is going to be
2077 * PSEUDO-DMA for systems that are strictly PIO,
2078 * since we can let the hardware do the handshaking.
2080 * For this to work, we need to know the transfersize
2081 * ahead of time, since the pseudo-DMA code will sit
2082 * in an unconditional loop.
2085 /* ++roman: I suggest, this should be
2087 * instead of leaving REAL_DMA out.
2090 #if defined(REAL_DMA)
2091 // if (!cmd->device->borken &&
2093 NCR5380_dma_xfer_len(instance
,cmd
,phase
)) > SUN3_DMA_MINSIZE
) {
2095 cmd
->SCp
.phase
= phase
;
2097 if (NCR5380_transfer_dma(instance
, &phase
,
2098 &len
, (unsigned char **) &cmd
->SCp
.ptr
)) {
2100 * If the watchdog timer fires, all future
2101 * accesses to this device will use the
2103 printk(KERN_NOTICE
"scsi%d: switching target %d "
2104 "lun %d to slow handshake\n", HOSTNO
,
2105 cmd
->device
->id
, cmd
->device
->lun
);
2106 cmd
->device
->borken
= 1;
2107 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2111 cmd
->result
= DID_ERROR
<< 16;
2113 /* XXX - need to source or sink data here, as appropriate */
2116 /* ++roman: When using real DMA,
2117 * information_transfer() should return after
2118 * starting DMA since it has nothing more to
2123 cmd
->SCp
.this_residual
-= transfersize
- len
;
2127 #endif /* defined(REAL_DMA) */
2128 NCR5380_transfer_pio(instance
, &phase
,
2129 (int *) &cmd
->SCp
.this_residual
, (unsigned char **)
2132 /* if we had intended to dma that command clear it */
2133 if(sun3_dma_setup_done
== cmd
)
2134 sun3_dma_setup_done
= NULL
;
2141 NCR5380_write(SELECT_ENABLE_REG
, 0); /* disable reselects */
2142 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2143 cmd
->SCp
.Message
= tmp
;
2147 * Linking lets us reduce the time required to get the
2148 * next command out to the device, hopefully this will
2149 * mean we don't waste another revolution due to the delays
2150 * required by ARBITRATION and another SELECTION.
2152 * In the current implementation proposal, low level drivers
2153 * merely have to start the next command, pointed to by
2154 * next_link, done() is called as with unlinked commands.
2157 case LINKED_CMD_COMPLETE
:
2158 case LINKED_FLG_CMD_COMPLETE
:
2159 /* Accept message by clearing ACK */
2160 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2162 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2163 "complete.\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2165 /* Enable reselect interrupts */
2166 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2168 * Sanity check : A linked command should only terminate
2169 * with one of these messages if there are more linked
2170 * commands available.
2173 if (!cmd
->next_link
) {
2174 printk(KERN_NOTICE
"scsi%d: target %d lun %d "
2175 "linked command complete, no next_link\n",
2176 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2178 do_abort (instance
);
2182 initialize_SCp(cmd
->next_link
);
2183 /* The next command is still part of this process; copy it
2184 * and don't free it! */
2185 cmd
->next_link
->tag
= cmd
->tag
;
2186 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2187 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2188 "done, calling scsi_done().\n",
2189 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2190 #ifdef NCR5380_STATS
2191 collect_stats(hostdata
, cmd
);
2193 cmd
->scsi_done(cmd
);
2194 cmd
= hostdata
->connected
;
2196 #endif /* def LINKED */
2198 case COMMAND_COMPLETE
:
2199 /* Accept message by clearing ACK */
2200 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2201 hostdata
->connected
= NULL
;
2202 QU_PRINTK("scsi%d: command for target %d, lun %d "
2203 "completed\n", HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2205 cmd_free_tag( cmd
);
2206 if (status_byte(cmd
->SCp
.Status
) == QUEUE_FULL
) {
2207 /* Turn a QUEUE FULL status into BUSY, I think the
2208 * mid level cannot handle QUEUE FULL :-( (The
2209 * command is retried after BUSY). Also update our
2210 * queue size to the number of currently issued
2213 /* ++Andreas: the mid level code knows about
2215 TAG_ALLOC
*ta
= &TagAlloc
[cmd
->device
->id
][cmd
->device
->lun
];
2216 TAG_PRINTK("scsi%d: target %d lun %d returned "
2217 "QUEUE_FULL after %d commands\n",
2218 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
,
2220 if (ta
->queue_size
> ta
->nr_allocated
)
2221 ta
->nr_allocated
= ta
->queue_size
;
2224 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2226 /* Enable reselect interrupts */
2227 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2230 * I'm not sure what the correct thing to do here is :
2232 * If the command that just executed is NOT a request
2233 * sense, the obvious thing to do is to set the result
2234 * code to the values of the stored parameters.
2236 * If it was a REQUEST SENSE command, we need some way to
2237 * differentiate between the failure code of the original
2238 * and the failure code of the REQUEST sense - the obvious
2239 * case is success, where we fall through and leave the
2240 * result code unchanged.
2242 * The non-obvious place is where the REQUEST SENSE failed
2245 if (cmd
->cmnd
[0] != REQUEST_SENSE
)
2246 cmd
->result
= cmd
->SCp
.Status
| (cmd
->SCp
.Message
<< 8);
2247 else if (status_byte(cmd
->SCp
.Status
) != GOOD
)
2248 cmd
->result
= (cmd
->result
& 0x00ffff) | (DID_ERROR
<< 16);
2251 if ((cmd
->cmnd
[0] != REQUEST_SENSE
) &&
2252 (status_byte(cmd
->SCp
.Status
) == CHECK_CONDITION
)) {
2253 ASEN_PRINTK("scsi%d: performing request sense\n",
2255 cmd
->cmnd
[0] = REQUEST_SENSE
;
2256 cmd
->cmnd
[1] &= 0xe0;
2259 cmd
->cmnd
[4] = sizeof(cmd
->sense_buffer
);
2261 cmd
->cmd_len
= COMMAND_SIZE(cmd
->cmnd
[0]);
2264 /* this is initialized from initialize_SCp
2265 cmd->SCp.buffer = NULL;
2266 cmd->SCp.buffers_residual = 0;
2268 cmd
->request_buffer
= (char *) cmd
->sense_buffer
;
2269 cmd
->request_bufflen
= sizeof(cmd
->sense_buffer
);
2271 local_irq_save(flags
);
2272 LIST(cmd
,hostdata
->issue_queue
);
2273 NEXT(cmd
) = hostdata
->issue_queue
;
2274 hostdata
->issue_queue
= (Scsi_Cmnd
*) cmd
;
2275 local_irq_restore(flags
);
2276 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2277 "issue queue\n", H_NO(cmd
));
2279 #endif /* def AUTOSENSE */
2281 #ifdef NCR5380_STATS
2282 collect_stats(hostdata
, cmd
);
2284 cmd
->scsi_done(cmd
);
2287 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2289 * Restore phase bits to 0 so an interrupted selection,
2290 * arbitration can resume.
2292 NCR5380_write(TARGET_COMMAND_REG
, 0);
2294 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2298 case MESSAGE_REJECT
:
2299 /* Accept message by clearing ACK */
2300 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2301 /* Enable reselect interrupts */
2302 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2303 switch (hostdata
->last_message
) {
2304 case HEAD_OF_QUEUE_TAG
:
2305 case ORDERED_QUEUE_TAG
:
2306 case SIMPLE_QUEUE_TAG
:
2307 /* The target obviously doesn't support tagged
2308 * queuing, even though it announced this ability in
2309 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2310 * clear 'tagged_supported' and lock the LUN, since
2311 * the command is treated as untagged further on.
2313 cmd
->device
->tagged_supported
= 0;
2314 hostdata
->busy
[cmd
->device
->id
] |= (1 << cmd
->device
->lun
);
2315 cmd
->tag
= TAG_NONE
;
2316 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2317 "QUEUE_TAG message; tagged queuing "
2319 HOSTNO
, cmd
->device
->id
, cmd
->device
->lun
);
2324 /* Accept message by clearing ACK */
2325 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2326 local_irq_save(flags
);
2327 cmd
->device
->disconnect
= 1;
2328 LIST(cmd
,hostdata
->disconnected_queue
);
2329 NEXT(cmd
) = hostdata
->disconnected_queue
;
2330 hostdata
->connected
= NULL
;
2331 hostdata
->disconnected_queue
= cmd
;
2332 local_irq_restore(flags
);
2333 QU_PRINTK("scsi%d: command for target %d lun %d was "
2334 "moved from connected to the "
2335 "disconnected_queue\n", HOSTNO
,
2336 cmd
->device
->id
, cmd
->device
->lun
);
2338 * Restore phase bits to 0 so an interrupted selection,
2339 * arbitration can resume.
2341 NCR5380_write(TARGET_COMMAND_REG
, 0);
2343 /* Enable reselect interrupts */
2344 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2345 /* Wait for bus free to avoid nasty timeouts */
2346 while ((NCR5380_read(STATUS_REG
) & SR_BSY
) && !hostdata
->connected
)
2348 #ifdef SUN3_SCSI_VME
2349 dregs
->csr
|= CSR_DMA_ENABLE
;
2353 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2354 * operation, in violation of the SCSI spec so we can safely
2355 * ignore SAVE/RESTORE pointers calls.
2357 * Unfortunately, some disks violate the SCSI spec and
2358 * don't issue the required SAVE_POINTERS message before
2359 * disconnecting, and we have to break spec to remain
2363 case RESTORE_POINTERS
:
2364 /* Accept message by clearing ACK */
2365 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2366 /* Enable reselect interrupts */
2367 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2369 case EXTENDED_MESSAGE
:
2371 * Extended messages are sent in the following format :
2373 * 0 EXTENDED_MESSAGE == 1
2374 * 1 length (includes one byte for code, doesn't
2375 * include first two bytes)
2377 * 3..length+1 arguments
2379 * Start the extended message buffer with the EXTENDED_MESSAGE
2380 * byte, since print_msg() wants the whole thing.
2382 extended_msg
[0] = EXTENDED_MESSAGE
;
2383 /* Accept first byte by clearing ACK */
2384 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2386 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO
);
2389 data
= extended_msg
+ 1;
2390 phase
= PHASE_MSGIN
;
2391 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2392 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO
,
2393 (int)extended_msg
[1], (int)extended_msg
[2]);
2395 if (!len
&& extended_msg
[1] <=
2396 (sizeof (extended_msg
) - 1)) {
2397 /* Accept third byte by clearing ACK */
2398 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2399 len
= extended_msg
[1] - 1;
2400 data
= extended_msg
+ 3;
2401 phase
= PHASE_MSGIN
;
2403 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2404 EXT_PRINTK("scsi%d: message received, residual %d\n",
2407 switch (extended_msg
[2]) {
2410 case EXTENDED_MODIFY_DATA_POINTER
:
2411 case EXTENDED_EXTENDED_IDENTIFY
:
2415 printk(KERN_NOTICE
"scsi%d: error receiving "
2416 "extended message\n", HOSTNO
);
2419 printk(KERN_NOTICE
"scsi%d: extended message "
2420 "code %02x length %d is too long\n",
2421 HOSTNO
, extended_msg
[2], extended_msg
[1]);
2424 /* Fall through to reject message */
2427 * If we get something weird that we aren't expecting,
2432 printk(KERN_DEBUG
"scsi%d: rejecting message ", HOSTNO
);
2433 print_msg (extended_msg
);
2435 } else if (tmp
!= EXTENDED_MESSAGE
)
2436 printk(KERN_DEBUG
"scsi%d: rejecting unknown "
2437 "message %02x from target %d, lun %d\n",
2438 HOSTNO
, tmp
, cmd
->device
->id
, cmd
->device
->lun
);
2440 printk(KERN_DEBUG
"scsi%d: rejecting unknown "
2442 "code %02x, length %d from target %d, lun %d\n",
2443 HOSTNO
, extended_msg
[1], extended_msg
[0],
2444 cmd
->device
->id
, cmd
->device
->lun
);
2447 msgout
= MESSAGE_REJECT
;
2448 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
|
2451 } /* switch (tmp) */
2456 hostdata
->last_message
= msgout
;
2457 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2458 if (msgout
== ABORT
) {
2460 cmd_free_tag( cmd
);
2462 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2464 hostdata
->connected
= NULL
;
2465 cmd
->result
= DID_ERROR
<< 16;
2466 #ifdef NCR5380_STATS
2467 collect_stats(hostdata
, cmd
);
2469 cmd
->scsi_done(cmd
);
2470 NCR5380_write(SELECT_ENABLE_REG
, hostdata
->id_mask
);
2479 * XXX for performance reasons, on machines with a
2480 * PSEUDO-DMA architecture we should probably
2481 * use the dma transfer function.
2483 NCR5380_transfer_pio(instance
, &phase
, &len
,
2489 NCR5380_transfer_pio(instance
, &phase
, &len
, &data
);
2490 cmd
->SCp
.Status
= tmp
;
2493 printk("scsi%d: unknown phase\n", HOSTNO
);
2494 NCR_PRINT(NDEBUG_ANY
);
2495 } /* switch(phase) */
2496 } /* if (tmp * SR_REQ) */
2501 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2503 * Purpose : does reselection, initializing the instance->connected
2504 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2505 * nexus has been reestablished,
2507 * Inputs : instance - this instance of the NCR5380.
2511 /* it might eventually prove necessary to do a dma setup on
2512 reselection, but it doesn't seem to be needed now -- sam */
2514 static void NCR5380_reselect (struct Scsi_Host
*instance
)
2516 SETUP_HOSTDATA(instance
);
2517 unsigned char target_mask
;
2522 unsigned char msg
[3];
2523 Scsi_Cmnd
*tmp
= NULL
, *prev
;
2524 /* unsigned long flags; */
2527 * Disable arbitration, etc. since the host adapter obviously
2528 * lost, and tell an interrupted NCR5380_select() to restart.
2531 NCR5380_write(MODE_REG
, MR_BASE
);
2532 hostdata
->restart_select
= 1;
2534 target_mask
= NCR5380_read(CURRENT_SCSI_DATA_REG
) & ~(hostdata
->id_mask
);
2536 RSL_PRINTK("scsi%d: reselect\n", HOSTNO
);
2539 * At this point, we have detected that our SCSI ID is on the bus,
2540 * SEL is true and BSY was false for at least one bus settle delay
2543 * We must assert BSY ourselves, until the target drops the SEL
2547 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_BSY
);
2549 while (NCR5380_read(STATUS_REG
) & SR_SEL
);
2550 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2553 * Wait for target to go into MSGIN.
2556 while (!(NCR5380_read(STATUS_REG
) & SR_REQ
));
2559 // acknowledge toggle to MSGIN
2560 NCR5380_write(TARGET_COMMAND_REG
, PHASE_SR_TO_TCR(PHASE_MSGIN
));
2562 // peek at the byte without really hitting the bus
2563 msg
[0] = NCR5380_read(CURRENT_SCSI_DATA_REG
);
2566 if (!(msg
[0] & 0x80)) {
2567 printk(KERN_DEBUG
"scsi%d: expecting IDENTIFY message, got ", HOSTNO
);
2572 lun
= (msg
[0] & 0x07);
2575 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2576 * just reestablished, and remove it from the disconnected queue.
2579 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
, prev
= NULL
;
2580 tmp
; prev
= tmp
, tmp
= NEXT(tmp
) ) {
2581 if ((target_mask
== (1 << tmp
->device
->id
)) && (lun
== tmp
->device
->lun
)
2583 && (tag
== tmp
->tag
)
2587 REMOVE(prev
, NEXT(prev
), tmp
, NEXT(tmp
));
2588 NEXT(prev
) = NEXT(tmp
);
2590 REMOVE(-1, hostdata
->disconnected_queue
, tmp
, NEXT(tmp
));
2591 hostdata
->disconnected_queue
= NEXT(tmp
);
2599 printk(KERN_WARNING
"scsi%d: warning: target bitmask %02x lun %d "
2603 "not in disconnected_queue.\n",
2604 HOSTNO
, target_mask
, lun
2610 * Since we have an established nexus that we can't do anything
2611 * with, we must abort it.
2617 /* engage dma setup for the command we just saw */
2620 unsigned long count
;
2622 if (!tmp
->SCp
.this_residual
&& tmp
->SCp
.buffers_residual
) {
2623 count
= tmp
->SCp
.buffer
->length
;
2624 d
= SGADDR(tmp
->SCp
.buffer
);
2626 count
= tmp
->SCp
.this_residual
;
2630 /* setup this command for dma if not already */
2631 if((count
> SUN3_DMA_MINSIZE
) && (sun3_dma_setup_done
!= tmp
))
2633 sun3scsi_dma_setup(d
, count
, rq_data_dir(tmp
->request
));
2634 sun3_dma_setup_done
= tmp
;
2640 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_ACK
);
2641 /* Accept message by clearing ACK */
2642 NCR5380_write(INITIATOR_COMMAND_REG
, ICR_BASE
);
2645 /* If the phase is still MSGIN, the target wants to send some more
2646 * messages. In case it supports tagged queuing, this is probably a
2647 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2650 if (phase
== PHASE_MSGIN
&& setup_use_tagged_queuing
) {
2651 /* Accept previous IDENTIFY message by clearing ACK */
2652 NCR5380_write( INITIATOR_COMMAND_REG
, ICR_BASE
);
2655 if (!NCR5380_transfer_pio(instance
, &phase
, &len
, &data
) &&
2656 msg
[1] == SIMPLE_QUEUE_TAG
)
2658 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2659 "reselection\n", HOSTNO
, target_mask
, lun
, tag
);
2663 hostdata
->connected
= tmp
;
2664 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2665 HOSTNO
, tmp
->target
, tmp
->lun
, tmp
->tag
);
2670 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2672 * Purpose : abort a command
2674 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2675 * host byte of the result field to, if zero DID_ABORTED is
2678 * Returns : 0 - success, -1 on failure.
2680 * XXX - there is no way to abort the command that is currently
2681 * connected, you have to wait for it to complete. If this is
2682 * a problem, we could implement longjmp() / setjmp(), setjmp()
2683 * called where the loop started in NCR5380_main().
2686 static int NCR5380_abort (Scsi_Cmnd
*cmd
)
2688 struct Scsi_Host
*instance
= cmd
->device
->host
;
2689 SETUP_HOSTDATA(instance
);
2690 Scsi_Cmnd
*tmp
, **prev
;
2691 unsigned long flags
;
2693 printk(KERN_NOTICE
"scsi%d: aborting command\n", HOSTNO
);
2694 print_Scsi_Cmnd (cmd
);
2696 NCR5380_print_status (instance
);
2698 local_irq_save(flags
);
2700 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO
,
2701 NCR5380_read(BUS_AND_STATUS_REG
),
2702 NCR5380_read(STATUS_REG
));
2706 * Case 1 : If the command is the currently executing command,
2707 * we'll set the aborted flag and return control so that
2708 * information transfer routine can exit cleanly.
2711 if (hostdata
->connected
== cmd
) {
2713 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO
);
2715 * We should perform BSY checking, and make sure we haven't slipped
2719 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2721 * Since we can't change phases until we've completed the current
2722 * handshake, we have to source or sink a byte of data if the current
2723 * phase is not MSGOUT.
2727 * Return control to the executing NCR drive so we can clear the
2728 * aborted flag and get back into our main loop.
2731 if (do_abort(instance
) == 0) {
2732 hostdata
->aborted
= 1;
2733 hostdata
->connected
= NULL
;
2734 cmd
->result
= DID_ABORT
<< 16;
2736 cmd_free_tag( cmd
);
2738 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2740 local_irq_restore(flags
);
2741 cmd
->scsi_done(cmd
);
2742 return SCSI_ABORT_SUCCESS
;
2744 /* local_irq_restore(flags); */
2745 printk("scsi%d: abort of connected command failed!\n", HOSTNO
);
2746 return SCSI_ABORT_ERROR
;
2752 * Case 2 : If the command hasn't been issued yet, we simply remove it
2753 * from the issue queue.
2755 for (prev
= (Scsi_Cmnd
**) &(hostdata
->issue_queue
),
2756 tmp
= (Scsi_Cmnd
*) hostdata
->issue_queue
;
2757 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
) )
2759 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2760 (*prev
) = NEXT(tmp
);
2762 tmp
->result
= DID_ABORT
<< 16;
2763 local_irq_restore(flags
);
2764 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2766 /* Tagged queuing note: no tag to free here, hasn't been assigned
2768 tmp
->scsi_done(tmp
);
2769 return SCSI_ABORT_SUCCESS
;
2773 * Case 3 : If any commands are connected, we're going to fail the abort
2774 * and let the high level SCSI driver retry at a later time or
2777 * Timeouts, and therefore aborted commands, will be highly unlikely
2778 * and handling them cleanly in this situation would make the common
2779 * case of noresets less efficient, and would pollute our code. So,
2783 if (hostdata
->connected
) {
2784 local_irq_restore(flags
);
2785 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO
);
2786 return SCSI_ABORT_SNOOZE
;
2790 * Case 4: If the command is currently disconnected from the bus, and
2791 * there are no connected commands, we reconnect the I_T_L or
2792 * I_T_L_Q nexus associated with it, go into message out, and send
2795 * This case is especially ugly. In order to reestablish the nexus, we
2796 * need to call NCR5380_select(). The easiest way to implement this
2797 * function was to abort if the bus was busy, and let the interrupt
2798 * handler triggered on the SEL for reselect take care of lost arbitrations
2799 * where necessary, meaning interrupts need to be enabled.
2801 * When interrupts are enabled, the queues may change - so we
2802 * can't remove it from the disconnected queue before selecting it
2803 * because that could cause a failure in hashing the nexus if that
2804 * device reselected.
2806 * Since the queues may change, we can't use the pointers from when we
2809 * So, we must first locate the command, and if NCR5380_select()
2810 * succeeds, then issue the abort, relocate the command and remove
2811 * it from the disconnected queue.
2814 for (tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
; tmp
;
2817 local_irq_restore(flags
);
2818 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO
);
2820 if (NCR5380_select (instance
, cmd
, (int) cmd
->tag
))
2821 return SCSI_ABORT_BUSY
;
2823 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO
);
2825 do_abort (instance
);
2827 local_irq_save(flags
);
2828 for (prev
= (Scsi_Cmnd
**) &(hostdata
->disconnected_queue
),
2829 tmp
= (Scsi_Cmnd
*) hostdata
->disconnected_queue
;
2830 tmp
; prev
= NEXTADDR(tmp
), tmp
= NEXT(tmp
) )
2832 REMOVE(5, *prev
, tmp
, NEXT(tmp
));
2835 tmp
->result
= DID_ABORT
<< 16;
2836 /* We must unlock the tag/LUN immediately here, since the
2837 * target goes to BUS FREE and doesn't send us another
2838 * message (COMMAND_COMPLETE or the like)
2841 cmd_free_tag( tmp
);
2843 hostdata
->busy
[cmd
->device
->id
] &= ~(1 << cmd
->device
->lun
);
2845 local_irq_restore(flags
);
2846 tmp
->scsi_done(tmp
);
2847 return SCSI_ABORT_SUCCESS
;
2852 * Case 5 : If we reached this point, the command was not found in any of
2855 * We probably reached this point because of an unlikely race condition
2856 * between the command completing successfully and the abortion code,
2857 * so we won't panic, but we will notify the user in case something really
2861 local_irq_restore(flags
);
2862 printk(KERN_INFO
"scsi%d: warning : SCSI command probably completed successfully\n"
2863 KERN_INFO
" before abortion\n", HOSTNO
);
2865 return SCSI_ABORT_NOT_RUNNING
;
2870 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
2872 * Purpose : reset the SCSI bus.
2874 * Returns : SCSI_RESET_WAKEUP
2878 static int NCR5380_bus_reset( Scsi_Cmnd
*cmd
)
2880 SETUP_HOSTDATA(cmd
->device
->host
);
2882 unsigned long flags
;
2884 Scsi_Cmnd
*connected
, *disconnected_queue
;
2888 NCR5380_print_status (cmd
->device
->host
);
2891 NCR5380_write( TARGET_COMMAND_REG
,
2892 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG
) ));
2894 NCR5380_write( INITIATOR_COMMAND_REG
, ICR_BASE
| ICR_ASSERT_RST
);
2896 /* reset NCR registers */
2897 NCR5380_write( INITIATOR_COMMAND_REG
, ICR_BASE
);
2898 NCR5380_write( MODE_REG
, MR_BASE
);
2899 NCR5380_write( TARGET_COMMAND_REG
, 0 );
2900 NCR5380_write( SELECT_ENABLE_REG
, 0 );
2901 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2902 * through anymore ... */
2903 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG
);
2905 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2906 /* XXX see below XXX */
2908 /* MSch: old-style reset: actually abort all command processing here */
2910 /* After the reset, there are no more connected or disconnected commands
2911 * and no busy units; to avoid problems with re-inserting the commands
2912 * into the issue_queue (via scsi_done()), the aborted commands are
2913 * remembered in local variables first.
2915 local_irq_save(flags
);
2916 connected
= (Scsi_Cmnd
*)hostdata
->connected
;
2917 hostdata
->connected
= NULL
;
2918 disconnected_queue
= (Scsi_Cmnd
*)hostdata
->disconnected_queue
;
2919 hostdata
->disconnected_queue
= NULL
;
2923 for( i
= 0; i
< 8; ++i
)
2924 hostdata
->busy
[i
] = 0;
2926 hostdata
->dma_len
= 0;
2928 local_irq_restore(flags
);
2930 /* In order to tell the mid-level code which commands were aborted,
2931 * set the command status to DID_RESET and call scsi_done() !!!
2932 * This ultimately aborts processing of these commands in the mid-level.
2935 if ((cmd
= connected
)) {
2936 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd
));
2937 cmd
->result
= (cmd
->result
& 0xffff) | (DID_RESET
<< 16);
2938 cmd
->scsi_done( cmd
);
2941 for (i
= 0; (cmd
= disconnected_queue
); ++i
) {
2942 disconnected_queue
= NEXT(cmd
);
2944 cmd
->result
= (cmd
->result
& 0xffff) | (DID_RESET
<< 16);
2945 cmd
->scsi_done( cmd
);
2948 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i
);
2951 /* since all commands have been explicitly terminated, we need to tell
2952 * the midlevel code that the reset was SUCCESSFUL, and there is no
2953 * need to 'wake up' the commands by a request_sense
2955 return SCSI_RESET_SUCCESS
| SCSI_RESET_BUS_RESET
;
2958 /* MSch: new-style reset handling: let the mid-level do what it can */
2960 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2961 * Mid-level is supposed to requeue all commands that were active on the
2962 * various low-level queues. In fact it does this, but that's not enough
2963 * because all these commands are subject to timeout. And if a timeout
2964 * happens for any removed command, *_abort() is called but all queues
2965 * are now empty. Abort then gives up the falcon lock, which is fatal,
2966 * since the mid-level will queue more commands and must have the lock
2967 * (it's all happening inside timer interrupt handler!!).
2968 * Even worse, abort will return NOT_RUNNING for all those commands not
2969 * on any queue, so they won't be retried ...
2971 * Conclusion: either scsi.c disables timeout for all resetted commands
2972 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2975 /* After the reset, there are no more connected or disconnected commands
2976 * and no busy units; so clear the low-level status here to avoid
2977 * conflicts when the mid-level code tries to wake up the affected
2981 if (hostdata
->issue_queue
)
2982 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd
));
2983 if (hostdata
->connected
)
2984 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd
));
2985 if (hostdata
->disconnected_queue
)
2986 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd
));
2988 local_irq_save(flags
);
2989 hostdata
->issue_queue
= NULL
;
2990 hostdata
->connected
= NULL
;
2991 hostdata
->disconnected_queue
= NULL
;
2995 for( i
= 0; i
< 8; ++i
)
2996 hostdata
->busy
[i
] = 0;
2998 hostdata
->dma_len
= 0;
3000 local_irq_restore(flags
);
3002 /* we did no complete reset of all commands, so a wakeup is required */
3003 return SCSI_RESET_WAKEUP
| SCSI_RESET_BUS_RESET
;
3007 /* Local Variables: */