blob: 4f0e5485ffde4bf0b859a3786191861f83e0a62f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by
2 Sam Creasey. */
3/*
4 * NCR 5380 generic driver routines. These should make it *trivial*
5 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * architecture.
7 *
8 * Note that these routines also work with NR53c400 family chips.
9 *
10 * Copyright 1993, Drew Eckhardt
11 * Visionary Computing
12 * (Unix and Linux consulting and custom programming)
13 * drew@colorado.edu
14 * +1 (303) 666-5836
15 *
16 * DISTRIBUTION RELEASE 6.
17 *
18 * For more information, please consult
19 *
20 * NCR 5380 Family
21 * SCSI Protocol Controller
22 * Databook
23 *
24 * NCR Microelectronics
25 * 1635 Aeroplaza Drive
26 * Colorado Springs, CO 80916
27 * 1+ (719) 578-3400
28 * 1+ (800) 334-5454
29 */
30
31/*
32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
33 * this file, too:
34 *
35 * - Some of the debug statements were incorrect (undefined variables and the
36 * like). I fixed that.
37 *
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.
41 *
42 * - When using real DMA, information_transfer() should return in a DATAOUT
43 * phase after starting the DMA. It has nothing more to do.
44 *
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
50 * calls.
51 *
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.
58 *
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.
62 *
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
65 * interrupt.
66 *
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.
70 *
71 */
db9dff32005-04-03 14:53:59 -050072#include <scsi/scsi_dbg.h>
Matthew Wilcox1abfd372005-12-15 16:22:01 -050073#include <scsi/scsi_transport_spi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75/*
76 * Further development / testing that should be done :
77 * 1. Test linked command handling code after Eric is ready with
78 * the high level code.
79 */
80
81#if (NDEBUG & NDEBUG_LISTS)
82#define LIST(x,y) \
83 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
84 if ((x)==(y)) udelay(5); }
85#define REMOVE(w,x,y,z) \
86 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
87 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
88 if ((x)==(y)) udelay(5); }
89#else
90#define LIST(x,y)
91#define REMOVE(w,x,y,z)
92#endif
93
94#ifndef notyet
95#undef LINKED
96#endif
97
98/*
99 * Design
100 * Issues :
101 *
102 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
103 * and specifically for each board rather than each chip. This makes their
104 * adaptation to platforms like the Mac (Some of which use NCR5380's)
105 * more difficult than it has to be.
106 *
107 * Also, many of the SCSI drivers were written before the command queuing
108 * routines were implemented, meaning their implementations of queued
109 * commands were hacked on rather than designed in from the start.
110 *
111 * When I designed the Linux SCSI drivers I figured that
112 * while having two different SCSI boards in a system might be useful
113 * for debugging things, two of the same type wouldn't be used.
114 * Well, I was wrong and a number of users have mailed me about running
115 * multiple high-performance SCSI boards in a server.
116 *
117 * Finally, when I get questions from users, I have no idea what
118 * revision of my driver they are running.
119 *
120 * This driver attempts to address these problems :
121 * This is a generic 5380 driver. To use it on a different platform,
122 * one simply writes appropriate system specific macros (ie, data
123 * transfer - some PC's will use the I/O bus, 68K's must use
124 * memory mapped) and drops this file in their 'C' wrapper.
125 *
126 * As far as command queueing, two queues are maintained for
127 * each 5380 in the system - commands that haven't been issued yet,
128 * and commands that are currently executing. This means that an
129 * unlimited number of commands may be queued, letting
130 * more commands propagate from the higher driver levels giving higher
131 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
132 * allowing multiple commands to propagate all the way to a SCSI-II device
133 * while a command is already executing.
134 *
135 * To solve the multiple-boards-in-the-same-system problem,
136 * there is a separate instance structure for each instance
137 * of a 5380 in the system. So, multiple NCR5380 drivers will
138 * be able to coexist with appropriate changes to the high level
139 * SCSI code.
140 *
141 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
142 * number (updated for each public release) printed by the
143 * NCR5380_print_options command, which should be called from the
144 * wrapper detect function, so that I know what release of the driver
145 * users are using.
146 *
147 * Issues specific to the NCR5380 :
148 *
149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150 * piece of hardware that requires you to sit in a loop polling for
151 * the REQ signal as long as you are connected. Some devices are
152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153 * while doing long seek operations.
154 *
155 * The workaround for this is to keep track of devices that have
156 * disconnected. If the device hasn't disconnected, for commands that
157 * should disconnect, we do something like
158 *
159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
160 *
161 * Some tweaking of N and M needs to be done. An algorithm based
162 * on "time to data" would give the best results as long as short time
163 * to datas (ie, on the same track) were considered, however these
164 * broken devices are the exception rather than the rule and I'd rather
165 * spend my time optimizing for the normal case.
166 *
167 * Architecture :
168 *
169 * At the heart of the design is a coroutine, NCR5380_main,
170 * which is started when not running by the interrupt handler,
171 * timer, and queue command function. It attempts to establish
172 * I_T_L or I_T_L_Q nexuses by removing the commands from the
173 * issue queue and calling NCR5380_select() if a nexus
174 * is not established.
175 *
176 * Once a nexus is established, the NCR5380_information_transfer()
177 * phase goes through the various phases as instructed by the target.
178 * if the target goes into MSG IN and sends a DISCONNECT message,
179 * the command structure is placed into the per instance disconnected
180 * queue, and NCR5380_main tries to find more work. If USLEEP
181 * was defined, and the target is idle for too long, the system
182 * will try to sleep.
183 *
184 * If a command has disconnected, eventually an interrupt will trigger,
185 * calling NCR5380_intr() which will in turn call NCR5380_reselect
186 * to reestablish a nexus. This will run main if necessary.
187 *
188 * On command termination, the done function will be called as
189 * appropriate.
190 *
191 * SCSI pointers are maintained in the SCp field of SCSI command
192 * structures, being initialized after the command is connected
193 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
194 * Note that in violation of the standard, an implicit SAVE POINTERS operation
195 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
196 */
197
198/*
199 * Using this file :
200 * This file a skeleton Linux SCSI driver for the NCR 5380 series
201 * of chips. To use it, you write an architecture specific functions
202 * and macros and include this file in your driver.
203 *
204 * These macros control options :
205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206 * for commands that return with a CHECK CONDITION status.
207 *
208 * LINKED - if defined, linked commands are supported.
209 *
210 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
211 *
212 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
213 *
214 * These macros MUST be defined :
215 *
216 * NCR5380_read(register) - read from the specified register
217 *
218 * NCR5380_write(register, value) - write to the specific register
219 *
220 * Either real DMA *or* pseudo DMA may be implemented
221 * REAL functions :
222 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
223 * Note that the DMA setup functions should return the number of bytes
224 * that they were able to program the controller for.
225 *
226 * Also note that generic i386/PC versions of these macros are
227 * available as NCR5380_i386_dma_write_setup,
228 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
229 *
230 * NCR5380_dma_write_setup(instance, src, count) - initialize
231 * NCR5380_dma_read_setup(instance, dst, count) - initialize
232 * NCR5380_dma_residual(instance); - residual count
233 *
234 * PSEUDO functions :
235 * NCR5380_pwrite(instance, src, count)
236 * NCR5380_pread(instance, dst, count);
237 *
238 * If nothing specific to this implementation needs doing (ie, with external
239 * hardware), you must also define
240 *
241 * NCR5380_queue_command
242 * NCR5380_reset
243 * NCR5380_abort
244 * NCR5380_proc_info
245 *
246 * to be the global entry points into the specific driver, ie
247 * #define NCR5380_queue_command t128_queue_command.
248 *
249 * If this is not done, the routines will be defined as static functions
250 * with the NCR5380* names and the user must provide a globally
251 * accessible wrapper function.
252 *
253 * The generic driver is initialized by calling NCR5380_init(instance),
254 * after setting the appropriate host specific fields and ID. If the
255 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
256 * possible) function may be used. Before the specific driver initialization
257 * code finishes, NCR5380_print_options should be called.
258 */
259
260static struct Scsi_Host *first_instance = NULL;
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100261static struct scsi_host_template *the_template = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263/* Macros ease life... :-) */
264#define SETUP_HOSTDATA(in) \
265 struct NCR5380_hostdata *hostdata = \
266 (struct NCR5380_hostdata *)(in)->hostdata
267#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
268
Al Viro2bb71b52006-12-14 15:00:15 +0000269#define NEXT(cmd) (*(struct scsi_cmnd **)&((cmd)->host_scribble))
Henne811c9362006-10-03 19:51:59 +0200270#define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272#define HOSTNO instance->host_no
273#define H_NO(cmd) (cmd)->device->host->host_no
274
Jens Axboe45711f12007-10-22 21:19:53 +0200275#define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277#ifdef SUPPORT_TAGS
278
279/*
280 * Functions for handling tagged queuing
281 * =====================================
282 *
283 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
284 *
285 * Using consecutive numbers for the tags is no good idea in my eyes. There
286 * could be wrong re-usings if the counter (8 bit!) wraps and some early
287 * command has been preempted for a long time. My solution: a bitfield for
288 * remembering used tags.
289 *
290 * There's also the problem that each target has a certain queue size, but we
291 * cannot know it in advance :-( We just see a QUEUE_FULL status being
292 * returned. So, in this case, the driver internal queue size assumption is
293 * reduced to the number of active tags if QUEUE_FULL is returned by the
294 * target. The command is returned to the mid-level, but with status changed
295 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
296 * correctly.
297 *
298 * We're also not allowed running tagged commands as long as an untagged
299 * command is active. And REQUEST SENSE commands after a contingent allegiance
300 * condition _must_ be untagged. To keep track whether an untagged command has
301 * been issued, the host->busy array is still employed, as it is without
302 * support for tagged queuing.
303 *
304 * One could suspect that there are possible race conditions between
305 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
306 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
307 * which already guaranteed to be running at most once. It is also the only
308 * place where tags/LUNs are allocated. So no other allocation can slip
309 * between that pair, there could only happen a reselection, which can free a
310 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
311 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
312 */
313
314/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
315#undef TAG_NONE
316#define TAG_NONE 0xff
317
318/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
319#if (MAX_TAGS % 32) != 0
320#error "MAX_TAGS must be a multiple of 32!"
321#endif
322
323typedef struct {
324 char allocated[MAX_TAGS/8];
325 int nr_allocated;
326 int queue_size;
327} TAG_ALLOC;
328
329static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
330
331
332static void __init init_tags( void )
333{
334 int target, lun;
335 TAG_ALLOC *ta;
336
337 if (!setup_use_tagged_queuing)
338 return;
339
340 for( target = 0; target < 8; ++target ) {
341 for( lun = 0; lun < 8; ++lun ) {
342 ta = &TagAlloc[target][lun];
343 memset( &ta->allocated, 0, MAX_TAGS/8 );
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.
348 */
349 ta->queue_size = MAX_TAGS;
350 }
351 }
352}
353
354
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
359 * conditions.
360 */
361
Henne811c9362006-10-03 19:51:59 +0200362static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364 SETUP_HOSTDATA(cmd->device->host);
365
366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 return( 1 );
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 return( 0 );
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 );
375 return( 1 );
376 }
377 return( 0 );
378}
379
380
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
383 * untagged.
384 */
385
Henne811c9362006-10-03 19:51:59 +0200386static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 SETUP_HOSTDATA(cmd->device->host);
389
390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
392 */
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 cmd->tag = TAG_NONE;
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 );
399 }
400 else {
401 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
402
403 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
404 set_bit( cmd->tag, &ta->allocated );
405 ta->nr_allocated++;
406 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
407 "(now %d tags in use)\n",
408 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
409 ta->nr_allocated );
410 }
411}
412
413
414/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
415 * unlock the LUN.
416 */
417
Henne811c9362006-10-03 19:51:59 +0200418static void cmd_free_tag(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
420 SETUP_HOSTDATA(cmd->device->host);
421
422 if (cmd->tag == TAG_NONE) {
423 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
424 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
425 H_NO(cmd), cmd->device->id, cmd->device->lun );
426 }
427 else if (cmd->tag >= MAX_TAGS) {
428 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
429 H_NO(cmd), cmd->tag );
430 }
431 else {
432 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
433 clear_bit( cmd->tag, &ta->allocated );
434 ta->nr_allocated--;
435 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
436 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
437 }
438}
439
440
441static void free_all_tags( void )
442{
443 int target, lun;
444 TAG_ALLOC *ta;
445
446 if (!setup_use_tagged_queuing)
447 return;
448
449 for( target = 0; target < 8; ++target ) {
450 for( lun = 0; lun < 8; ++lun ) {
451 ta = &TagAlloc[target][lun];
452 memset( &ta->allocated, 0, MAX_TAGS/8 );
453 ta->nr_allocated = 0;
454 }
455 }
456}
457
458#endif /* SUPPORT_TAGS */
459
460
461/*
Henne811c9362006-10-03 19:51:59 +0200462 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 *
464 * Purpose: Try to merge several scatter-gather requests into one DMA
465 * transfer. This is possible if the scatter buffers lie on
466 * physical contiguous addresses.
467 *
Henne811c9362006-10-03 19:51:59 +0200468 * Parameters: struct scsi_cmnd *cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * The command to work on. The first scatter buffer's data are
470 * assumed to be already transfered into ptr/this_residual.
471 */
472
Henne811c9362006-10-03 19:51:59 +0200473static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 unsigned long endaddr;
476#if (NDEBUG & NDEBUG_MERGING)
477 unsigned long oldlen = cmd->SCp.this_residual;
478 int cnt = 1;
479#endif
480
481 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
482 cmd->SCp.buffers_residual &&
483 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
484
485 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
486 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
487#if (NDEBUG & NDEBUG_MERGING)
488 ++cnt;
489#endif
490 ++cmd->SCp.buffer;
491 --cmd->SCp.buffers_residual;
492 cmd->SCp.this_residual += cmd->SCp.buffer->length;
493 endaddr += cmd->SCp.buffer->length;
494 }
495#if (NDEBUG & NDEBUG_MERGING)
496 if (oldlen != cmd->SCp.this_residual)
497 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
498 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
499#endif
500}
501
502/*
Henne811c9362006-10-03 19:51:59 +0200503 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 *
505 * Purpose : initialize the saved data pointers for cmd to point to the
506 * start of the buffer.
507 *
Henne811c9362006-10-03 19:51:59 +0200508 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 */
510
Henne811c9362006-10-03 19:51:59 +0200511static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512{
513 /*
514 * Initialize the Scsi Pointer field so that all of the commands in the
515 * various queues are valid.
516 */
517
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200518 if (scsi_bufflen(cmd)) {
519 cmd->SCp.buffer = scsi_sglist(cmd);
520 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
522 cmd->SCp.this_residual = cmd->SCp.buffer->length;
523
524 /* ++roman: Try to merge some scatter-buffers if they are at
525 * contiguous physical addresses.
526 */
527// merge_contiguous_buffers( cmd );
528 } else {
529 cmd->SCp.buffer = NULL;
530 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200531 cmd->SCp.ptr = NULL;
532 cmd->SCp.this_residual = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
534
535}
536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537#include <linux/delay.h>
538
539#if 1
540static struct {
541 unsigned char mask;
542 const char * name;}
543signals[] = {{ 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}},
546basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
547icrs[] = {{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"},
550 {0, NULL}},
551mrs[] = {{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"},
556 {0, NULL}};
557
558/*
559 * Function : void NCR5380_print(struct Scsi_Host *instance)
560 *
561 * Purpose : print the SCSI bus signals for debugging purposes
562 *
563 * Input : instance - which NCR5380
564 */
565
566static void NCR5380_print(struct Scsi_Host *instance) {
567 unsigned char status, data, basr, mr, icr, i;
568 unsigned long flags;
569
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);
593 printk("\n");
594}
595
596static struct {
597 unsigned char value;
598 const char *name;
599} phases[] = {
600 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
601 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
602 {PHASE_UNKNOWN, "UNKNOWN"}};
603
604/*
605 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
606 *
607 * Purpose : print the current SCSI phase for debugging purposes
608 *
609 * Input : instance - which NCR5380
610 */
611
612static void NCR5380_print_phase(struct Scsi_Host *instance)
613{
614 unsigned char status;
615 int i;
616
617 status = NCR5380_read(STATUS_REG);
618 if (!(status & SR_REQ))
619 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
620 else {
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);
624 }
625}
626
627#else /* !NDEBUG */
628
629/* dummies... */
630__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
631__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
632
633#endif
634
635/*
636 * ++roman: New scheme of calling NCR5380_main()
637 *
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.
642 *
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.
646 */
647
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900648#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649#include <linux/workqueue.h>
650#include <linux/interrupt.h>
651
652static volatile int main_running = 0;
Al Viro2bb71b52006-12-14 15:00:15 +0000653static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655static __inline__ void queue_main(void)
656{
657 if (!main_running) {
658 /* If in interrupt and NCR5380_main() not already running,
659 queue it on the 'immediate' task queue, to be processed
660 immediately after the current interrupt processing has
661 finished. */
662 schedule_work(&NCR5380_tqueue);
663 }
664 /* else: nothing to do: the running NCR5380_main() will pick up
665 any newly queued command. */
666}
667
668
669static inline void NCR5380_all_init (void)
670{
671 static int done = 0;
672 if (!done) {
673 INI_PRINTK("scsi : NCR5380_all_init()\n");
674 done = 1;
675 }
676}
677
678
679/*
680 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
681 *
682 * Purpose : called by probe code indicating the NCR5380 driver
683 * options that were selected.
684 *
685 * Inputs : instance, pointer to this instance. Unused.
686 */
687
688static void __init NCR5380_print_options (struct Scsi_Host *instance)
689{
690 printk(" generic options"
691#ifdef AUTOSENSE
692 " AUTOSENSE"
693#endif
694#ifdef REAL_DMA
695 " REAL DMA"
696#endif
697#ifdef PARITY
698 " PARITY"
699#endif
700#ifdef SUPPORT_TAGS
701 " SCSI-2 TAGGED QUEUING"
702#endif
703 );
704 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
705}
706
707/*
708 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
709 *
710 * Purpose : print commands in the various queues, called from
711 * NCR5380_abort and NCR5380_debug to aid debugging.
712 *
713 * Inputs : instance, pointer to this instance.
714 */
715
716static void NCR5380_print_status (struct Scsi_Host *instance)
717{
718 char *pr_bfr;
719 char *start;
720 int len;
721
722 NCR_PRINT(NDEBUG_ANY);
723 NCR_PRINT_PHASE(NDEBUG_ANY);
724
725 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
726 if (!pr_bfr) {
727 printk("NCR5380_print_status: no memory for print buffer\n");
728 return;
729 }
730 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
731 pr_bfr[len] = 0;
732 printk("\n%s\n", pr_bfr);
733 free_page((unsigned long) pr_bfr);
734}
735
736
737/******************************************/
738/*
739 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
740 *
741 * *buffer: I/O buffer
742 * **start: if inout == FALSE pointer into buffer where user read should start
743 * offset: current offset
744 * length: length of buffer
745 * hostno: Scsi_Host host_no
746 * inout: TRUE - user is writing; FALSE - user is reading
747 *
748 * Return the number of bytes read from or written
749*/
750
751#undef SPRINTF
752#define SPRINTF(fmt,args...) \
753 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
754 pos += sprintf(pos, fmt , ## args); } while(0)
755static
Henne811c9362006-10-03 19:51:59 +0200756char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
757 int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Henne811c9362006-10-03 19:51:59 +0200759static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
760 char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 char *pos = buffer;
763 struct NCR5380_hostdata *hostdata;
Henne811c9362006-10-03 19:51:59 +0200764 struct scsi_cmnd *ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 unsigned long flags;
766 off_t begin = 0;
767#define check_offset() \
768 do { \
769 if (pos - buffer < offset - begin) { \
770 begin += pos - buffer; \
771 pos = buffer; \
772 } \
773 } while (0)
774
775 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
776
777 if (inout) { /* Has data been written to the file ? */
778 return(-ENOSYS); /* Currently this is a no-op */
779 }
780 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
781 check_offset();
782 local_irq_save(flags);
783 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
784 check_offset();
785 if (!hostdata->connected)
786 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
787 else
Henne811c9362006-10-03 19:51:59 +0200788 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 pos, buffer, length);
790 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
791 check_offset();
Henne811c9362006-10-03 19:51:59 +0200792 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
793 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
795 check_offset();
796 }
797
798 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
799 check_offset();
Henne811c9362006-10-03 19:51:59 +0200800 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 ptr = NEXT(ptr)) {
802 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
803 check_offset();
804 }
805
806 local_irq_restore(flags);
807 *start = buffer + (offset - begin);
808 if (pos - buffer < offset - begin)
809 return 0;
810 else if (pos - buffer - (offset - begin) < length)
811 return pos - buffer - (offset - begin);
812 return length;
813}
814
Henne811c9362006-10-03 19:51:59 +0200815static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
816 int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817{
818 int i, s;
819 unsigned char *command;
820 SPRINTF("scsi%d: destination target %d, lun %d\n",
821 H_NO(cmd), cmd->device->id, cmd->device->lun);
822 SPRINTF(" command = ");
823 command = cmd->cmnd;
824 SPRINTF("%2d (0x%02x)", command[0], command[0]);
825 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
826 SPRINTF(" %02x", command[i]);
827 SPRINTF("\n");
828 return pos;
829}
830
831
832/*
833 * Function : void NCR5380_init (struct Scsi_Host *instance)
834 *
835 * Purpose : initializes *instance and corresponding 5380 chip.
836 *
837 * Inputs : instance - instantiation of the 5380 driver.
838 *
839 * Notes : I assume that the host, hostno, and id bits have been
840 * set correctly. I don't care about the irq and other fields.
841 *
842 */
843
844static int NCR5380_init (struct Scsi_Host *instance, int flags)
845{
846 int i;
847 SETUP_HOSTDATA(instance);
848
849 NCR5380_all_init();
850
851 hostdata->aborted = 0;
852 hostdata->id_mask = 1 << instance->this_id;
853 hostdata->id_higher_mask = 0;
854 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
855 if (i > hostdata->id_mask)
856 hostdata->id_higher_mask |= i;
857 for (i = 0; i < 8; ++i)
858 hostdata->busy[i] = 0;
859#ifdef SUPPORT_TAGS
860 init_tags();
861#endif
862#if defined (REAL_DMA)
863 hostdata->dma_len = 0;
864#endif
865 hostdata->targets_present = 0;
866 hostdata->connected = NULL;
867 hostdata->issue_queue = NULL;
868 hostdata->disconnected_queue = NULL;
869 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
870
871 if (!the_template) {
872 the_template = instance->hostt;
873 first_instance = instance;
874 }
875
876
877#ifndef AUTOSENSE
878 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
879 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
880 " without AUTOSENSE option, contingent allegiance conditions may\n"
881 " be incorrectly cleared.\n", HOSTNO);
882#endif /* def AUTOSENSE */
883
884 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
885 NCR5380_write(MODE_REG, MR_BASE);
886 NCR5380_write(TARGET_COMMAND_REG, 0);
887 NCR5380_write(SELECT_ENABLE_REG, 0);
888
889 return 0;
890}
891
892/*
Henne811c9362006-10-03 19:51:59 +0200893 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
894 * void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 *
896 * Purpose : enqueues a SCSI command
897 *
898 * Inputs : cmd - SCSI command, done - function called on completion, with
899 * a pointer to the command descriptor.
900 *
901 * Returns : 0
902 *
903 * Side effects :
904 * cmd is added to the per instance issue_queue, with minor
905 * twiddling done to the host specific fields of cmd. If the
906 * main coroutine is not running, it is restarted.
907 *
908 */
909
910/* Only make static if a wrapper function is used */
Jeff Garzikf2812332010-11-16 02:10:29 -0500911static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd,
Henne811c9362006-10-03 19:51:59 +0200912 void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913{
914 SETUP_HOSTDATA(cmd->device->host);
Henne811c9362006-10-03 19:51:59 +0200915 struct scsi_cmnd *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 unsigned long flags;
917
918#if (NDEBUG & NDEBUG_NO_WRITE)
919 switch (cmd->cmnd[0]) {
920 case WRITE_6:
921 case WRITE_10:
922 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
923 H_NO(cmd));
924 cmd->result = (DID_ERROR << 16);
925 done(cmd);
926 return 0;
927 }
928#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
929
930
931#ifdef NCR5380_STATS
932# if 0
933 if (!hostdata->connected && !hostdata->issue_queue &&
934 !hostdata->disconnected_queue) {
935 hostdata->timebase = jiffies;
936 }
937# endif
938# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200939 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940# endif
941 switch (cmd->cmnd[0])
942 {
943 case WRITE:
944 case WRITE_6:
945 case WRITE_10:
946 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200947 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 hostdata->pendingw++;
949 break;
950 case READ:
951 case READ_6:
952 case READ_10:
953 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200954 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 hostdata->pendingr++;
956 break;
957 }
958#endif
959
960 /*
961 * We use the host_scribble field as a pointer to the next command
962 * in a queue
963 */
964
965 NEXT(cmd) = NULL;
966 cmd->scsi_done = done;
967
968 cmd->result = 0;
969
970
971 /*
972 * Insert the cmd into the issue queue. Note that REQUEST SENSE
973 * commands are added to the head of the queue since any command will
974 * clear the contingent allegiance condition that exists and the
975 * sense data is only guaranteed to be valid while the condition exists.
976 */
977
978 local_irq_save(flags);
979 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
980 * Otherwise a running NCR5380_main may steal the lock.
981 * Lock before actually inserting due to fairness reasons explained in
982 * atari_scsi.c. If we insert first, then it's impossible for this driver
983 * to release the lock.
984 * Stop timer for this command while waiting for the lock, or timeouts
985 * may happen (and they really do), and it's no good if the command doesn't
986 * appear in any of the queues.
987 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
988 * because also a timer int can trigger an abort or reset, which would
989 * alter queues and touch the lock.
990 */
991 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
992 LIST(cmd, hostdata->issue_queue);
993 NEXT(cmd) = hostdata->issue_queue;
994 hostdata->issue_queue = cmd;
995 } else {
Henne811c9362006-10-03 19:51:59 +0200996 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 NEXT(tmp); tmp = NEXT(tmp))
998 ;
999 LIST(cmd, tmp);
1000 NEXT(tmp) = cmd;
1001 }
1002
1003 local_irq_restore(flags);
1004
1005 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1006 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1007
1008 /* If queue_command() is called from an interrupt (real one or bottom
1009 * half), we let queue_main() do the job of taking care about main. If it
1010 * is already running, this is a no-op, else main will be queued.
1011 *
1012 * If we're not in an interrupt, we can call NCR5380_main()
1013 * unconditionally, because it cannot be already running.
1014 */
1015 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1016 queue_main();
1017 else
1018 NCR5380_main(NULL);
1019 return 0;
1020}
1021
Jeff Garzikf2812332010-11-16 02:10:29 -05001022static DEF_SCSI_QCMD(NCR5380_queue_command)
1023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024/*
1025 * Function : NCR5380_main (void)
1026 *
1027 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1028 * be done on the NCR5380 host adapters in a system. Both
1029 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1030 * in case it is not running.
1031 *
1032 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1033 * reenable them. This prevents reentrancy and kernel stack overflow.
1034 */
1035
Al Viro2bb71b52006-12-14 15:00:15 +00001036static void NCR5380_main (struct work_struct *bl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037{
Henne811c9362006-10-03 19:51:59 +02001038 struct scsi_cmnd *tmp, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 struct Scsi_Host *instance = first_instance;
1040 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1041 int done;
1042 unsigned long flags;
1043
1044 /*
1045 * We run (with interrupts disabled) until we're sure that none of
1046 * the host adapters have anything that can be done, at which point
1047 * we set main_running to 0 and exit.
1048 *
1049 * Interrupts are enabled before doing various other internal
1050 * instructions, after we've decided that we need to run through
1051 * the loop again.
1052 *
1053 * this should prevent any race conditions.
1054 *
1055 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1056 * because also a timer int can trigger an abort or reset, which can
1057 * alter queues and touch the Falcon lock.
1058 */
1059
1060 /* Tell int handlers main() is now already executing. Note that
1061 no races are possible here. If an int comes in before
1062 'main_running' is set here, and queues/executes main via the
1063 task queue, it doesn't do any harm, just this instance of main
1064 won't find any work left to do. */
1065 if (main_running)
1066 return;
1067 main_running = 1;
1068
1069 local_save_flags(flags);
1070 do {
1071 local_irq_disable(); /* Freeze request queues */
1072 done = 1;
1073
1074 if (!hostdata->connected) {
1075 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1076 /*
1077 * Search through the issue_queue for a command destined
1078 * for a target that's not busy.
1079 */
1080#if (NDEBUG & NDEBUG_LISTS)
Henne811c9362006-10-03 19:51:59 +02001081 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1083 ;
1084 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1085#endif
Henne811c9362006-10-03 19:51:59 +02001086 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1088
1089#if (NDEBUG & NDEBUG_LISTS)
1090 if (prev != tmp)
1091 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1092 tmp, tmp->target, hostdata->busy[tmp->target],
1093 tmp->lun);
1094#endif
1095 /* When we find one, remove it from the issue queue. */
1096 /* ++guenther: possible race with Falcon locking */
1097 if (
1098#ifdef SUPPORT_TAGS
1099 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1100#else
1101 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1102#endif
1103 ) {
1104 /* ++guenther: just to be sure, this must be atomic */
1105 local_irq_disable();
1106 if (prev) {
1107 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1108 NEXT(prev) = NEXT(tmp);
1109 } else {
1110 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1111 hostdata->issue_queue = NEXT(tmp);
1112 }
1113 NEXT(tmp) = NULL;
1114
1115 /* reenable interrupts after finding one */
1116 local_irq_restore(flags);
1117
1118 /*
1119 * Attempt to establish an I_T_L nexus here.
1120 * On success, instance->hostdata->connected is set.
1121 * On failure, we must add the command back to the
1122 * issue queue so we can keep trying.
1123 */
1124 MAIN_PRINTK("scsi%d: main(): command for target %d "
1125 "lun %d removed from issue_queue\n",
1126 HOSTNO, tmp->target, tmp->lun);
1127 /*
1128 * REQUEST SENSE commands are issued without tagged
1129 * queueing, even on SCSI-II devices because the
1130 * contingent allegiance condition exists for the
1131 * entire unit.
1132 */
1133 /* ++roman: ...and the standard also requires that
1134 * REQUEST SENSE command are untagged.
1135 */
1136
1137#ifdef SUPPORT_TAGS
1138 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1139#endif
1140 if (!NCR5380_select(instance, tmp,
1141 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1142 TAG_NEXT)) {
1143 break;
1144 } else {
1145 local_irq_disable();
1146 LIST(tmp, hostdata->issue_queue);
1147 NEXT(tmp) = hostdata->issue_queue;
1148 hostdata->issue_queue = tmp;
1149#ifdef SUPPORT_TAGS
1150 cmd_free_tag( tmp );
1151#endif
1152 local_irq_restore(flags);
1153 MAIN_PRINTK("scsi%d: main(): select() failed, "
1154 "returned to issue_queue\n", HOSTNO);
1155 if (hostdata->connected)
1156 break;
1157 }
1158 } /* if target/lun/target queue is not busy */
1159 } /* for issue_queue */
1160 } /* if (!hostdata->connected) */
1161 if (hostdata->connected
1162#ifdef REAL_DMA
1163 && !hostdata->dma_len
1164#endif
1165 ) {
1166 local_irq_restore(flags);
1167 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1168 HOSTNO);
1169 NCR5380_information_transfer(instance);
1170 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1171 done = 0;
1172 }
1173 } while (!done);
1174
1175 /* Better allow ints _after_ 'main_running' has been cleared, else
1176 an interrupt could believe we'll pick up the work it left for
1177 us, but we won't see it anymore here... */
1178 main_running = 0;
1179 local_irq_restore(flags);
1180}
1181
1182
1183#ifdef REAL_DMA
1184/*
1185 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1186 *
1187 * Purpose : Called by interrupt handler when DMA finishes or a phase
1188 * mismatch occurs (which would finish the DMA transfer).
1189 *
1190 * Inputs : instance - this instance of the NCR5380.
1191 *
1192 */
1193
1194static void NCR5380_dma_complete( struct Scsi_Host *instance )
1195{
1196 SETUP_HOSTDATA(instance);
1197 int transfered;
1198 unsigned char **data;
1199 volatile int *count;
1200
1201 if (!hostdata->connected) {
1202 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1203 "no connected cmd\n", HOSTNO);
1204 return;
1205 }
1206
1207 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1208 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1209 NCR5380_read(STATUS_REG));
1210
1211 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1212 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1213 printk("please e-mail sammy@sammy.net with a description of how this\n");
1214 printk("error was produced.\n");
1215 BUG();
1216 }
1217
1218 /* make sure we're not stuck in a data phase */
1219 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1220 BASR_ACK)) ==
1221 (BASR_PHASE_MATCH | BASR_ACK)) {
1222 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1223 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1224 "overrun!\n", HOSTNO);
1225 printk("not prepared for this error!\n");
1226 printk("please e-mail sammy@sammy.net with a description of how this\n");
1227 printk("error was produced.\n");
1228 BUG();
1229 }
1230
1231
1232
1233 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1234 NCR5380_write(MODE_REG, MR_BASE);
1235 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1236
1237 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1238 hostdata->dma_len = 0;
1239
1240 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1241 count = &(hostdata->connected->SCp.this_residual);
1242 *data += transfered;
1243 *count -= transfered;
1244
1245}
1246#endif /* REAL_DMA */
1247
1248
1249/*
1250 * Function : void NCR5380_intr (int irq)
1251 *
1252 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1253 * from the disconnected queue, and restarting NCR5380_main()
1254 * as required.
1255 *
1256 * Inputs : int irq, irq that caused this interrupt.
1257 *
1258 */
1259
David Howells7d12e782006-10-05 14:55:46 +01001260static irqreturn_t NCR5380_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261{
1262 struct Scsi_Host *instance = first_instance;
1263 int done = 1, handled = 0;
1264 unsigned char basr;
1265
1266 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1267
1268 /* Look for pending interrupts */
1269 basr = NCR5380_read(BUS_AND_STATUS_REG);
1270 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1271 /* dispatch to appropriate routine if found and done=0 */
1272 if (basr & BASR_IRQ) {
1273 NCR_PRINT(NDEBUG_INTR);
1274 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1275 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001276// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1278 NCR5380_reselect(instance);
1279 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1280 }
1281 else if (basr & BASR_PARITY_ERROR) {
1282 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1283 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1284 }
1285 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1286 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1287 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1288 }
1289 else {
1290 /*
1291 * The rest of the interrupt conditions can occur only during a
1292 * DMA transfer
1293 */
1294
1295#if defined(REAL_DMA)
1296 /*
1297 * We should only get PHASE MISMATCH and EOP interrupts if we have
1298 * DMA enabled, so do a sanity check based on the current setting
1299 * of the MODE register.
1300 */
1301
1302 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1303 ((basr & BASR_END_DMA_TRANSFER) ||
1304 !(basr & BASR_PHASE_MATCH))) {
1305
1306 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1307 NCR5380_dma_complete( instance );
1308 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001309// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 } else
1311#endif /* REAL_DMA */
1312 {
1313/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1314 if (basr & BASR_PHASE_MATCH)
1315 INT_PRINTK("scsi%d: unknown interrupt, "
1316 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1317 HOSTNO, basr, NCR5380_read(MODE_REG),
1318 NCR5380_read(STATUS_REG));
1319 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1320#ifdef SUN3_SCSI_VME
1321 dregs->csr |= CSR_DMA_ENABLE;
1322#endif
1323 }
1324 } /* if !(SELECTION || PARITY) */
1325 handled = 1;
1326 } /* BASR & IRQ */
1327 else {
1328
1329 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1330 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1331 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1332 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1333#ifdef SUN3_SCSI_VME
1334 dregs->csr |= CSR_DMA_ENABLE;
1335#endif
1336 }
1337
1338 if (!done) {
1339 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1340 /* Put a call to NCR5380_main() on the queue... */
1341 queue_main();
1342 }
1343 return IRQ_RETVAL(handled);
1344}
1345
1346#ifdef NCR5380_STATS
Henne811c9362006-10-03 19:51:59 +02001347static void collect_stats(struct NCR5380_hostdata *hostdata,
1348 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349{
1350# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001351 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352# endif
1353 switch (cmd->cmnd[0])
1354 {
1355 case WRITE:
1356 case WRITE_6:
1357 case WRITE_10:
1358 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001359 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 hostdata->pendingw--;
1361 break;
1362 case READ:
1363 case READ_6:
1364 case READ_10:
1365 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001366 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 hostdata->pendingr--;
1368 break;
1369 }
1370}
1371#endif
1372
1373/*
Henne811c9362006-10-03 19:51:59 +02001374 * Function : int NCR5380_select(struct Scsi_Host *instance,
1375 * struct scsi_cmnd *cmd, int tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 *
1377 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1378 * including ARBITRATION, SELECTION, and initial message out for
1379 * IDENTIFY and queue messages.
1380 *
1381 * Inputs : instance - instantiation of the 5380 driver on which this
1382 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1383 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1384 * the command that is presently connected.
1385 *
1386 * Returns : -1 if selection could not execute for some reason,
1387 * 0 if selection succeeded or failed because the target
1388 * did not respond.
1389 *
1390 * Side effects :
1391 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1392 * with registers as they should have been on entry - ie
1393 * SELECT_ENABLE will be set appropriately, the NCR5380
1394 * will cease to drive any SCSI bus signals.
1395 *
1396 * If successful : I_T_L or I_T_L_Q nexus will be established,
1397 * instance->connected will be set to cmd.
1398 * SELECT interrupt will be disabled.
1399 *
1400 * If failed (no target) : cmd->scsi_done() will be called, and the
1401 * cmd->result host byte set to DID_BAD_TARGET.
1402 */
1403
Henne811c9362006-10-03 19:51:59 +02001404static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1405 int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406{
1407 SETUP_HOSTDATA(instance);
1408 unsigned char tmp[3], phase;
1409 unsigned char *data;
1410 int len;
1411 unsigned long timeout;
1412 unsigned long flags;
1413
1414 hostdata->restart_select = 0;
1415 NCR_PRINT(NDEBUG_ARBITRATION);
1416 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1417 instance->this_id);
1418
1419 /*
1420 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1421 * data bus during SELECTION.
1422 */
1423
1424 local_irq_save(flags);
1425 if (hostdata->connected) {
1426 local_irq_restore(flags);
1427 return -1;
1428 }
1429 NCR5380_write(TARGET_COMMAND_REG, 0);
1430
1431
1432 /*
1433 * Start arbitration.
1434 */
1435
1436 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1437 NCR5380_write(MODE_REG, MR_ARBITRATE);
1438
1439 local_irq_restore(flags);
1440
1441 /* Wait for arbitration logic to complete */
1442#if NCR_TIMEOUT
1443 {
1444 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1445
1446 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1447 && time_before(jiffies, timeout) && !hostdata->connected)
1448 ;
1449 if (time_after_eq(jiffies, timeout))
1450 {
1451 printk("scsi : arbitration timeout at %d\n", __LINE__);
1452 NCR5380_write(MODE_REG, MR_BASE);
1453 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1454 return -1;
1455 }
1456 }
1457#else /* NCR_TIMEOUT */
1458 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1459 && !hostdata->connected);
1460#endif
1461
1462 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1463
1464 if (hostdata->connected) {
1465 NCR5380_write(MODE_REG, MR_BASE);
1466 return -1;
1467 }
1468 /*
1469 * The arbitration delay is 2.2us, but this is a minimum and there is
1470 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1471 * the integral nature of udelay().
1472 *
1473 */
1474
1475 udelay(3);
1476
1477 /* Check for lost arbitration */
1478 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1479 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1480 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1481 hostdata->connected) {
1482 NCR5380_write(MODE_REG, MR_BASE);
1483 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1484 HOSTNO);
1485 return -1;
1486 }
1487
1488 /* after/during arbitration, BSY should be asserted.
1489 IBM DPES-31080 Version S31Q works now */
1490 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1491 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1492 ICR_ASSERT_BSY ) ;
1493
1494 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1495 hostdata->connected) {
1496 NCR5380_write(MODE_REG, MR_BASE);
1497 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1498 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1499 HOSTNO);
1500 return -1;
1501 }
1502
1503 /*
1504 * Again, bus clear + bus settle time is 1.2us, however, this is
1505 * a minimum so we'll udelay ceil(1.2)
1506 */
1507
1508#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1509 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1510 udelay(15);
1511#else
1512 udelay(2);
1513#endif
1514
1515 if (hostdata->connected) {
1516 NCR5380_write(MODE_REG, MR_BASE);
1517 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1518 return -1;
1519 }
1520
1521 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1522
1523 /*
1524 * Now that we have won arbitration, start Selection process, asserting
1525 * the host and target ID's on the SCSI bus.
1526 */
1527
1528 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1529
1530 /*
1531 * Raise ATN while SEL is true before BSY goes false from arbitration,
1532 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1533 * phase immediately after selection.
1534 */
1535
1536 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1537 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1538 NCR5380_write(MODE_REG, MR_BASE);
1539
1540 /*
1541 * Reselect interrupts must be turned off prior to the dropping of BSY,
1542 * otherwise we will trigger an interrupt.
1543 */
1544
1545 if (hostdata->connected) {
1546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1547 return -1;
1548 }
1549
1550 NCR5380_write(SELECT_ENABLE_REG, 0);
1551
1552 /*
1553 * The initiator shall then wait at least two deskew delays and release
1554 * the BSY signal.
1555 */
1556 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1557
1558 /* Reset BSY */
1559 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1560 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1561
1562 /*
1563 * Something weird happens when we cease to drive BSY - looks
1564 * like the board/chip is letting us do another read before the
1565 * appropriate propagation delay has expired, and we're confusing
1566 * a BSY signal from ourselves as the target's response to SELECTION.
1567 *
1568 * A small delay (the 'C++' frontend breaks the pipeline with an
1569 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1570 * tighter 'C' code breaks and requires this) solves the problem -
1571 * the 1 us delay is arbitrary, and only used because this delay will
1572 * be the same on other platforms and since it works here, it should
1573 * work there.
1574 *
1575 * wingel suggests that this could be due to failing to wait
1576 * one deskew delay.
1577 */
1578
1579 udelay(1);
1580
1581 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1582
1583 /*
1584 * The SCSI specification calls for a 250 ms timeout for the actual
1585 * selection.
1586 */
1587
1588 timeout = jiffies + 25;
1589
1590 /*
1591 * XXX very interesting - we're seeing a bounce where the BSY we
1592 * asserted is being reflected / still asserted (propagation delay?)
1593 * and it's detecting as true. Sigh.
1594 */
1595
1596#if 0
1597 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1598 * IO while SEL is true. But again, there are some disks out the in the
1599 * world that do that nevertheless. (Somebody claimed that this announces
1600 * reselection capability of the target.) So we better skip that test and
Jan Engelhardt96de0e22007-10-19 23:21:04 +02001601 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 */
1603
1604 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1605 (SR_BSY | SR_IO)));
1606
1607 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1608 (SR_SEL | SR_IO)) {
1609 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1610 NCR5380_reselect(instance);
1611 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1612 HOSTNO);
1613 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1614 return -1;
1615 }
1616#else
1617 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1618#endif
1619
1620 /*
1621 * No less than two deskew delays after the initiator detects the
1622 * BSY signal is true, it shall release the SEL signal and may
1623 * change the DATA BUS. -wingel
1624 */
1625
1626 udelay(1);
1627
1628 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1629
1630 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1631 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1632 if (hostdata->targets_present & (1 << cmd->device->id)) {
1633 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1634 if (hostdata->restart_select)
1635 printk(KERN_NOTICE "\trestart select\n");
1636 NCR_PRINT(NDEBUG_ANY);
1637 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1638 return -1;
1639 }
1640 cmd->result = DID_BAD_TARGET << 16;
1641#ifdef NCR5380_STATS
1642 collect_stats(hostdata, cmd);
1643#endif
1644#ifdef SUPPORT_TAGS
1645 cmd_free_tag( cmd );
1646#endif
1647 cmd->scsi_done(cmd);
1648 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1649 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1650 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1651 return 0;
1652 }
1653
1654 hostdata->targets_present |= (1 << cmd->device->id);
1655
1656 /*
1657 * Since we followed the SCSI spec, and raised ATN while SEL
1658 * was true but before BSY was false during selection, the information
1659 * transfer phase should be a MESSAGE OUT phase so that we can send the
1660 * IDENTIFY message.
1661 *
1662 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1663 * message (2 bytes) with a tag ID that we increment with every command
1664 * until it wraps back to 0.
1665 *
1666 * XXX - it turns out that there are some broken SCSI-II devices,
1667 * which claim to support tagged queuing but fail when more than
1668 * some number of commands are issued at once.
1669 */
1670
1671 /* Wait for start of REQ/ACK handshake */
1672 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1673
1674 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1675 HOSTNO, cmd->device->id);
1676 tmp[0] = IDENTIFY(1, cmd->device->lun);
1677
1678#ifdef SUPPORT_TAGS
1679 if (cmd->tag != TAG_NONE) {
1680 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1681 tmp[2] = cmd->tag;
1682 len = 3;
1683 } else
1684 len = 1;
1685#else
1686 len = 1;
1687 cmd->tag=0;
1688#endif /* SUPPORT_TAGS */
1689
1690 /* Send message(s) */
1691 data = tmp;
1692 phase = PHASE_MSGOUT;
1693 NCR5380_transfer_pio(instance, &phase, &len, &data);
1694 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1695 /* XXX need to handle errors here */
1696 hostdata->connected = cmd;
1697#ifndef SUPPORT_TAGS
1698 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1699#endif
1700#ifdef SUN3_SCSI_VME
1701 dregs->csr |= CSR_INTR;
1702#endif
1703 initialize_SCp(cmd);
1704
1705
1706 return 0;
1707}
1708
1709/*
1710 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1711 * unsigned char *phase, int *count, unsigned char **data)
1712 *
1713 * Purpose : transfers data in given phase using polled I/O
1714 *
1715 * Inputs : instance - instance of driver, *phase - pointer to
1716 * what phase is expected, *count - pointer to number of
1717 * bytes to transfer, **data - pointer to data pointer.
1718 *
1719 * Returns : -1 when different phase is entered without transferring
1720 * maximum number of bytes, 0 if all bytes are transfered or exit
1721 * is in same phase.
1722 *
1723 * Also, *phase, *count, *data are modified in place.
1724 *
1725 * XXX Note : handling for bus free may be useful.
1726 */
1727
1728/*
1729 * Note : this code is not as quick as it could be, however it
1730 * IS 100% reliable, and for the actual data transfer where speed
1731 * counts, we will always do a pseudo DMA or DMA transfer.
1732 */
1733
1734static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1735 unsigned char *phase, int *count,
1736 unsigned char **data)
1737{
1738 register unsigned char p = *phase, tmp;
1739 register int c = *count;
1740 register unsigned char *d = *data;
1741
1742 /*
1743 * The NCR5380 chip will only drive the SCSI bus when the
1744 * phase specified in the appropriate bits of the TARGET COMMAND
1745 * REGISTER match the STATUS REGISTER
1746 */
1747
1748 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1749
1750 do {
1751 /*
1752 * Wait for assertion of REQ, after which the phase bits will be
1753 * valid
1754 */
1755 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1756
1757 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1758
1759 /* Check for phase mismatch */
1760 if ((tmp & PHASE_MASK) != p) {
1761 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1762 NCR_PRINT_PHASE(NDEBUG_PIO);
1763 break;
1764 }
1765
1766 /* Do actual transfer from SCSI bus to / from memory */
1767 if (!(p & SR_IO))
1768 NCR5380_write(OUTPUT_DATA_REG, *d);
1769 else
1770 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1771
1772 ++d;
1773
1774 /*
1775 * The SCSI standard suggests that in MSGOUT phase, the initiator
1776 * should drop ATN on the last byte of the message phase
1777 * after REQ has been asserted for the handshake but before
1778 * the initiator raises ACK.
1779 */
1780
1781 if (!(p & SR_IO)) {
1782 if (!((p & SR_MSG) && c > 1)) {
1783 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1784 ICR_ASSERT_DATA);
1785 NCR_PRINT(NDEBUG_PIO);
1786 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1787 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1788 } else {
1789 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1790 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1791 NCR_PRINT(NDEBUG_PIO);
1792 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1793 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1794 }
1795 } else {
1796 NCR_PRINT(NDEBUG_PIO);
1797 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1798 }
1799
1800 while (NCR5380_read(STATUS_REG) & SR_REQ);
1801
1802 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1803
1804/*
1805 * We have several special cases to consider during REQ/ACK handshaking :
1806 * 1. We were in MSGOUT phase, and we are on the last byte of the
1807 * message. ATN must be dropped as ACK is dropped.
1808 *
1809 * 2. We are in a MSGIN phase, and we are on the last byte of the
1810 * message. We must exit with ACK asserted, so that the calling
1811 * code may raise ATN before dropping ACK to reject the message.
1812 *
1813 * 3. ACK and ATN are clear and the target may proceed as normal.
1814 */
1815 if (!(p == PHASE_MSGIN && c == 1)) {
1816 if (p == PHASE_MSGOUT && c > 1)
1817 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1818 else
1819 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1820 }
1821 } while (--c);
1822
1823 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1824
1825 *count = c;
1826 *data = d;
1827 tmp = NCR5380_read(STATUS_REG);
1828 /* The phase read from the bus is valid if either REQ is (already)
1829 * asserted or if ACK hasn't been released yet. The latter is the case if
1830 * we're in MSGIN and all wanted bytes have been received. */
1831 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1832 *phase = tmp & PHASE_MASK;
1833 else
1834 *phase = PHASE_UNKNOWN;
1835
1836 if (!c || (*phase == p))
1837 return 0;
1838 else
1839 return -1;
1840}
1841
1842/*
1843 * Function : do_abort (Scsi_Host *host)
1844 *
1845 * Purpose : abort the currently established nexus. Should only be
1846 * called from a routine which can drop into a
1847 *
1848 * Returns : 0 on success, -1 on failure.
1849 */
1850
1851static int do_abort (struct Scsi_Host *host)
1852{
1853 unsigned char tmp, *msgptr, phase;
1854 int len;
1855
1856 /* Request message out phase */
1857 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1858
1859 /*
1860 * Wait for the target to indicate a valid phase by asserting
1861 * REQ. Once this happens, we'll have either a MSGOUT phase
1862 * and can immediately send the ABORT message, or we'll have some
1863 * other phase and will have to source/sink data.
1864 *
1865 * We really don't care what value was on the bus or what value
1866 * the target sees, so we just handshake.
1867 */
1868
Roel Kluin3be38e72007-11-15 21:13:46 +01001869 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870
1871 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1872
1873 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1874 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1875 ICR_ASSERT_ACK);
1876 while (NCR5380_read(STATUS_REG) & SR_REQ);
1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1878 }
1879
1880 tmp = ABORT;
1881 msgptr = &tmp;
1882 len = 1;
1883 phase = PHASE_MSGOUT;
1884 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1885
1886 /*
1887 * If we got here, and the command completed successfully,
1888 * we're about to go into bus free state.
1889 */
1890
1891 return len ? -1 : 0;
1892}
1893
1894#if defined(REAL_DMA)
1895/*
1896 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1897 * unsigned char *phase, int *count, unsigned char **data)
1898 *
1899 * Purpose : transfers data in given phase using either real
1900 * or pseudo DMA.
1901 *
1902 * Inputs : instance - instance of driver, *phase - pointer to
1903 * what phase is expected, *count - pointer to number of
1904 * bytes to transfer, **data - pointer to data pointer.
1905 *
1906 * Returns : -1 when different phase is entered without transferring
1907 * maximum number of bytes, 0 if all bytes or transfered or exit
1908 * is in same phase.
1909 *
1910 * Also, *phase, *count, *data are modified in place.
1911 *
1912 */
1913
1914
1915static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1916 unsigned char *phase, int *count,
1917 unsigned char **data)
1918{
1919 SETUP_HOSTDATA(instance);
1920 register int c = *count;
1921 register unsigned char p = *phase;
1922 unsigned long flags;
1923
1924 /* sanity check */
1925 if(!sun3_dma_setup_done) {
1926 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1927 BUG();
1928 }
1929 hostdata->dma_len = c;
1930
1931 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1932 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1933 c, (p & SR_IO) ? "to" : "from", *data);
1934
1935 /* netbsd turns off ints here, why not be safe and do it too */
1936 local_irq_save(flags);
1937
1938 /* send start chain */
1939 sun3scsi_dma_start(c, *data);
1940
1941 if (p & SR_IO) {
1942 NCR5380_write(TARGET_COMMAND_REG, 1);
1943 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1944 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1945 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1946 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1947 } else {
1948 NCR5380_write(TARGET_COMMAND_REG, 0);
1949 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1950 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1951 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1952 NCR5380_write(START_DMA_SEND_REG, 0);
1953 }
1954
1955#ifdef SUN3_SCSI_VME
1956 dregs->csr |= CSR_DMA_ENABLE;
1957#endif
1958
1959 local_irq_restore(flags);
1960
1961 sun3_dma_active = 1;
1962 return 0;
1963}
1964#endif /* defined(REAL_DMA) */
1965
1966/*
1967 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1968 *
1969 * Purpose : run through the various SCSI phases and do as the target
1970 * directs us to. Operates on the currently connected command,
1971 * instance->connected.
1972 *
1973 * Inputs : instance, instance for which we are doing commands
1974 *
1975 * Side effects : SCSI things happen, the disconnected queue will be
1976 * modified if a command disconnects, *instance->connected will
1977 * change.
1978 *
1979 * XXX Note : we need to watch for bus free or a reset condition here
1980 * to recover from an unexpected bus free condition.
1981 */
1982
1983static void NCR5380_information_transfer (struct Scsi_Host *instance)
1984{
1985 SETUP_HOSTDATA(instance);
1986 unsigned long flags;
1987 unsigned char msgout = NOP;
1988 int sink = 0;
1989 int len;
1990#if defined(REAL_DMA)
1991 int transfersize;
1992#endif
1993 unsigned char *data;
1994 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
Henne811c9362006-10-03 19:51:59 +02001995 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996
1997#ifdef SUN3_SCSI_VME
1998 dregs->csr |= CSR_INTR;
1999#endif
2000
2001 while (1) {
2002 tmp = NCR5380_read(STATUS_REG);
2003 /* We only have a valid SCSI phase when REQ is asserted */
2004 if (tmp & SR_REQ) {
2005 phase = (tmp & PHASE_MASK);
2006 if (phase != old_phase) {
2007 old_phase = phase;
2008 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2009 }
2010
2011 if(phase == PHASE_CMDOUT) {
2012 void *d;
2013 unsigned long count;
2014
2015 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2016 count = cmd->SCp.buffer->length;
2017 d = SGADDR(cmd->SCp.buffer);
2018 } else {
2019 count = cmd->SCp.this_residual;
2020 d = cmd->SCp.ptr;
2021 }
2022#ifdef REAL_DMA
2023 /* this command setup for dma yet? */
2024 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2025 != cmd))
2026 {
Christoph Hellwig33659eb2010-08-07 18:17:56 +02002027 if (cmd->request->cmd_type == REQ_TYPE_FS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 sun3scsi_dma_setup(d, count,
2029 rq_data_dir(cmd->request));
2030 sun3_dma_setup_done = cmd;
2031 }
2032 }
2033#endif
2034#ifdef SUN3_SCSI_VME
2035 dregs->csr |= CSR_INTR;
2036#endif
2037 }
2038
2039
2040 if (sink && (phase != PHASE_MSGOUT)) {
2041 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2042
2043 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2044 ICR_ASSERT_ACK);
2045 while (NCR5380_read(STATUS_REG) & SR_REQ);
2046 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2047 ICR_ASSERT_ATN);
2048 sink = 0;
2049 continue;
2050 }
2051
2052 switch (phase) {
2053 case PHASE_DATAOUT:
2054#if (NDEBUG & NDEBUG_NO_DATAOUT)
2055 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2056 "aborted\n", HOSTNO);
2057 sink = 1;
2058 do_abort(instance);
2059 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002060 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 return;
2062#endif
2063 case PHASE_DATAIN:
2064 /*
2065 * If there is no room left in the current buffer in the
2066 * scatter-gather list, move onto the next one.
2067 */
2068 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2069 ++cmd->SCp.buffer;
2070 --cmd->SCp.buffers_residual;
2071 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2072 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2073
2074 /* ++roman: Try to merge some scatter-buffers if
2075 * they are at contiguous physical addresses.
2076 */
2077// merge_contiguous_buffers( cmd );
2078 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2079 HOSTNO, cmd->SCp.this_residual,
2080 cmd->SCp.buffers_residual);
2081 }
2082
2083 /*
2084 * The preferred transfer method is going to be
2085 * PSEUDO-DMA for systems that are strictly PIO,
2086 * since we can let the hardware do the handshaking.
2087 *
2088 * For this to work, we need to know the transfersize
2089 * ahead of time, since the pseudo-DMA code will sit
2090 * in an unconditional loop.
2091 */
2092
2093/* ++roman: I suggest, this should be
2094 * #if def(REAL_DMA)
2095 * instead of leaving REAL_DMA out.
2096 */
2097
2098#if defined(REAL_DMA)
2099// if (!cmd->device->borken &&
2100 if((transfersize =
2101 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2102 len = transfersize;
2103 cmd->SCp.phase = phase;
2104
2105 if (NCR5380_transfer_dma(instance, &phase,
2106 &len, (unsigned char **) &cmd->SCp.ptr)) {
2107 /*
2108 * If the watchdog timer fires, all future
2109 * accesses to this device will use the
2110 * polled-IO. */
2111 printk(KERN_NOTICE "scsi%d: switching target %d "
2112 "lun %d to slow handshake\n", HOSTNO,
2113 cmd->device->id, cmd->device->lun);
2114 cmd->device->borken = 1;
2115 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2116 ICR_ASSERT_ATN);
2117 sink = 1;
2118 do_abort(instance);
2119 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002120 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121 /* XXX - need to source or sink data here, as appropriate */
2122 } else {
2123#ifdef REAL_DMA
2124 /* ++roman: When using real DMA,
2125 * information_transfer() should return after
2126 * starting DMA since it has nothing more to
2127 * do.
2128 */
2129 return;
2130#else
2131 cmd->SCp.this_residual -= transfersize - len;
2132#endif
2133 }
2134 } else
2135#endif /* defined(REAL_DMA) */
2136 NCR5380_transfer_pio(instance, &phase,
2137 (int *) &cmd->SCp.this_residual, (unsigned char **)
2138 &cmd->SCp.ptr);
2139#ifdef REAL_DMA
2140 /* if we had intended to dma that command clear it */
2141 if(sun3_dma_setup_done == cmd)
2142 sun3_dma_setup_done = NULL;
2143#endif
2144
2145 break;
2146 case PHASE_MSGIN:
2147 len = 1;
2148 data = &tmp;
2149 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2150 NCR5380_transfer_pio(instance, &phase, &len, &data);
2151 cmd->SCp.Message = tmp;
2152
2153 switch (tmp) {
2154 /*
2155 * Linking lets us reduce the time required to get the
2156 * next command out to the device, hopefully this will
2157 * mean we don't waste another revolution due to the delays
2158 * required by ARBITRATION and another SELECTION.
2159 *
2160 * In the current implementation proposal, low level drivers
2161 * merely have to start the next command, pointed to by
2162 * next_link, done() is called as with unlinked commands.
2163 */
2164#ifdef LINKED
2165 case LINKED_CMD_COMPLETE:
2166 case LINKED_FLG_CMD_COMPLETE:
2167 /* Accept message by clearing ACK */
2168 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2169
2170 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2171 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2172
2173 /* Enable reselect interrupts */
2174 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2175 /*
2176 * Sanity check : A linked command should only terminate
2177 * with one of these messages if there are more linked
2178 * commands available.
2179 */
2180
2181 if (!cmd->next_link) {
2182 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2183 "linked command complete, no next_link\n",
2184 HOSTNO, cmd->device->id, cmd->device->lun);
2185 sink = 1;
2186 do_abort (instance);
2187 return;
2188 }
2189
2190 initialize_SCp(cmd->next_link);
2191 /* The next command is still part of this process; copy it
2192 * and don't free it! */
2193 cmd->next_link->tag = cmd->tag;
2194 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2195 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2196 "done, calling scsi_done().\n",
2197 HOSTNO, cmd->device->id, cmd->device->lun);
2198#ifdef NCR5380_STATS
2199 collect_stats(hostdata, cmd);
2200#endif
2201 cmd->scsi_done(cmd);
2202 cmd = hostdata->connected;
2203 break;
2204#endif /* def LINKED */
2205 case ABORT:
2206 case COMMAND_COMPLETE:
2207 /* Accept message by clearing ACK */
2208 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2209 hostdata->connected = NULL;
2210 QU_PRINTK("scsi%d: command for target %d, lun %d "
2211 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2212#ifdef SUPPORT_TAGS
2213 cmd_free_tag( cmd );
2214 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2215 /* Turn a QUEUE FULL status into BUSY, I think the
2216 * mid level cannot handle QUEUE FULL :-( (The
2217 * command is retried after BUSY). Also update our
2218 * queue size to the number of currently issued
2219 * commands now.
2220 */
2221 /* ++Andreas: the mid level code knows about
2222 QUEUE_FULL now. */
2223 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2224 TAG_PRINTK("scsi%d: target %d lun %d returned "
2225 "QUEUE_FULL after %d commands\n",
2226 HOSTNO, cmd->device->id, cmd->device->lun,
2227 ta->nr_allocated);
2228 if (ta->queue_size > ta->nr_allocated)
2229 ta->nr_allocated = ta->queue_size;
2230 }
2231#else
2232 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2233#endif
2234 /* Enable reselect interrupts */
2235 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2236
2237 /*
2238 * I'm not sure what the correct thing to do here is :
2239 *
2240 * If the command that just executed is NOT a request
2241 * sense, the obvious thing to do is to set the result
2242 * code to the values of the stored parameters.
2243 *
2244 * If it was a REQUEST SENSE command, we need some way to
2245 * differentiate between the failure code of the original
2246 * and the failure code of the REQUEST sense - the obvious
2247 * case is success, where we fall through and leave the
2248 * result code unchanged.
2249 *
2250 * The non-obvious place is where the REQUEST SENSE failed
2251 */
2252
2253 if (cmd->cmnd[0] != REQUEST_SENSE)
2254 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2255 else if (status_byte(cmd->SCp.Status) != GOOD)
2256 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2257
2258#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002259 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2260 hostdata->ses.cmd_len) {
2261 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2262 hostdata->ses.cmd_len = 0 ;
2263 }
2264
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2266 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
Boaz Harrosh28424d32007-09-10 22:37:45 +03002267 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268 ASEN_PRINTK("scsi%d: performing request sense\n",
2269 HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 /* this is initialized from initialize_SCp
2271 cmd->SCp.buffer = NULL;
2272 cmd->SCp.buffers_residual = 0;
2273 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274
2275 local_irq_save(flags);
2276 LIST(cmd,hostdata->issue_queue);
2277 NEXT(cmd) = hostdata->issue_queue;
Henne811c9362006-10-03 19:51:59 +02002278 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279 local_irq_restore(flags);
2280 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2281 "issue queue\n", H_NO(cmd));
2282 } else
2283#endif /* def AUTOSENSE */
2284 {
2285#ifdef NCR5380_STATS
2286 collect_stats(hostdata, cmd);
2287#endif
2288 cmd->scsi_done(cmd);
2289 }
2290
2291 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2292 /*
2293 * Restore phase bits to 0 so an interrupted selection,
2294 * arbitration can resume.
2295 */
2296 NCR5380_write(TARGET_COMMAND_REG, 0);
2297
2298 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2299 barrier();
2300
2301 return;
2302 case MESSAGE_REJECT:
2303 /* Accept message by clearing ACK */
2304 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2305 /* Enable reselect interrupts */
2306 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2307 switch (hostdata->last_message) {
2308 case HEAD_OF_QUEUE_TAG:
2309 case ORDERED_QUEUE_TAG:
2310 case SIMPLE_QUEUE_TAG:
2311 /* The target obviously doesn't support tagged
2312 * queuing, even though it announced this ability in
2313 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2314 * clear 'tagged_supported' and lock the LUN, since
2315 * the command is treated as untagged further on.
2316 */
2317 cmd->device->tagged_supported = 0;
2318 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2319 cmd->tag = TAG_NONE;
2320 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2321 "QUEUE_TAG message; tagged queuing "
2322 "disabled\n",
2323 HOSTNO, cmd->device->id, cmd->device->lun);
2324 break;
2325 }
2326 break;
2327 case DISCONNECT:
2328 /* Accept message by clearing ACK */
2329 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2330 local_irq_save(flags);
2331 cmd->device->disconnect = 1;
2332 LIST(cmd,hostdata->disconnected_queue);
2333 NEXT(cmd) = hostdata->disconnected_queue;
2334 hostdata->connected = NULL;
2335 hostdata->disconnected_queue = cmd;
2336 local_irq_restore(flags);
2337 QU_PRINTK("scsi%d: command for target %d lun %d was "
2338 "moved from connected to the "
2339 "disconnected_queue\n", HOSTNO,
2340 cmd->device->id, cmd->device->lun);
2341 /*
2342 * Restore phase bits to 0 so an interrupted selection,
2343 * arbitration can resume.
2344 */
2345 NCR5380_write(TARGET_COMMAND_REG, 0);
2346
2347 /* Enable reselect interrupts */
2348 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2349 /* Wait for bus free to avoid nasty timeouts */
2350 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2351 barrier();
2352#ifdef SUN3_SCSI_VME
2353 dregs->csr |= CSR_DMA_ENABLE;
2354#endif
2355 return;
2356 /*
2357 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2358 * operation, in violation of the SCSI spec so we can safely
2359 * ignore SAVE/RESTORE pointers calls.
2360 *
2361 * Unfortunately, some disks violate the SCSI spec and
2362 * don't issue the required SAVE_POINTERS message before
2363 * disconnecting, and we have to break spec to remain
2364 * compatible.
2365 */
2366 case SAVE_POINTERS:
2367 case RESTORE_POINTERS:
2368 /* Accept message by clearing ACK */
2369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2370 /* Enable reselect interrupts */
2371 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2372 break;
2373 case EXTENDED_MESSAGE:
2374/*
2375 * Extended messages are sent in the following format :
2376 * Byte
2377 * 0 EXTENDED_MESSAGE == 1
2378 * 1 length (includes one byte for code, doesn't
2379 * include first two bytes)
2380 * 2 code
2381 * 3..length+1 arguments
2382 *
2383 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002384 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 */
2386 extended_msg[0] = EXTENDED_MESSAGE;
2387 /* Accept first byte by clearing ACK */
2388 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2389
2390 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2391
2392 len = 2;
2393 data = extended_msg + 1;
2394 phase = PHASE_MSGIN;
2395 NCR5380_transfer_pio(instance, &phase, &len, &data);
2396 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2397 (int)extended_msg[1], (int)extended_msg[2]);
2398
2399 if (!len && extended_msg[1] <=
2400 (sizeof (extended_msg) - 1)) {
2401 /* Accept third byte by clearing ACK */
2402 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2403 len = extended_msg[1] - 1;
2404 data = extended_msg + 3;
2405 phase = PHASE_MSGIN;
2406
2407 NCR5380_transfer_pio(instance, &phase, &len, &data);
2408 EXT_PRINTK("scsi%d: message received, residual %d\n",
2409 HOSTNO, len);
2410
2411 switch (extended_msg[2]) {
2412 case EXTENDED_SDTR:
2413 case EXTENDED_WDTR:
2414 case EXTENDED_MODIFY_DATA_POINTER:
2415 case EXTENDED_EXTENDED_IDENTIFY:
2416 tmp = 0;
2417 }
2418 } else if (len) {
2419 printk(KERN_NOTICE "scsi%d: error receiving "
2420 "extended message\n", HOSTNO);
2421 tmp = 0;
2422 } else {
2423 printk(KERN_NOTICE "scsi%d: extended message "
2424 "code %02x length %d is too long\n",
2425 HOSTNO, extended_msg[2], extended_msg[1]);
2426 tmp = 0;
2427 }
2428 /* Fall through to reject message */
2429
2430 /*
2431 * If we get something weird that we aren't expecting,
2432 * reject it.
2433 */
2434 default:
2435 if (!tmp) {
2436 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002437 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 printk("\n");
2439 } else if (tmp != EXTENDED_MESSAGE)
2440 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2441 "message %02x from target %d, lun %d\n",
2442 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2443 else
2444 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2445 "extended message "
2446 "code %02x, length %d from target %d, lun %d\n",
2447 HOSTNO, extended_msg[1], extended_msg[0],
2448 cmd->device->id, cmd->device->lun);
2449
2450
2451 msgout = MESSAGE_REJECT;
2452 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2453 ICR_ASSERT_ATN);
2454 break;
2455 } /* switch (tmp) */
2456 break;
2457 case PHASE_MSGOUT:
2458 len = 1;
2459 data = &msgout;
2460 hostdata->last_message = msgout;
2461 NCR5380_transfer_pio(instance, &phase, &len, &data);
2462 if (msgout == ABORT) {
2463#ifdef SUPPORT_TAGS
2464 cmd_free_tag( cmd );
2465#else
2466 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2467#endif
2468 hostdata->connected = NULL;
2469 cmd->result = DID_ERROR << 16;
2470#ifdef NCR5380_STATS
2471 collect_stats(hostdata, cmd);
2472#endif
2473 cmd->scsi_done(cmd);
2474 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2475 return;
2476 }
2477 msgout = NOP;
2478 break;
2479 case PHASE_CMDOUT:
2480 len = cmd->cmd_len;
2481 data = cmd->cmnd;
2482 /*
2483 * XXX for performance reasons, on machines with a
2484 * PSEUDO-DMA architecture we should probably
2485 * use the dma transfer function.
2486 */
2487 NCR5380_transfer_pio(instance, &phase, &len,
2488 &data);
2489 break;
2490 case PHASE_STATIN:
2491 len = 1;
2492 data = &tmp;
2493 NCR5380_transfer_pio(instance, &phase, &len, &data);
2494 cmd->SCp.Status = tmp;
2495 break;
2496 default:
2497 printk("scsi%d: unknown phase\n", HOSTNO);
2498 NCR_PRINT(NDEBUG_ANY);
2499 } /* switch(phase) */
2500 } /* if (tmp * SR_REQ) */
2501 } /* while (1) */
2502}
2503
2504/*
2505 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2506 *
2507 * Purpose : does reselection, initializing the instance->connected
Henne811c9362006-10-03 19:51:59 +02002508 * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509 * nexus has been reestablished,
2510 *
2511 * Inputs : instance - this instance of the NCR5380.
2512 *
2513 */
2514
2515/* it might eventually prove necessary to do a dma setup on
2516 reselection, but it doesn't seem to be needed now -- sam */
2517
2518static void NCR5380_reselect (struct Scsi_Host *instance)
2519{
2520 SETUP_HOSTDATA(instance);
2521 unsigned char target_mask;
2522 unsigned char lun;
2523#ifdef SUPPORT_TAGS
2524 unsigned char tag;
2525#endif
2526 unsigned char msg[3];
Henne811c9362006-10-03 19:51:59 +02002527 struct scsi_cmnd *tmp = NULL, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528/* unsigned long flags; */
2529
2530 /*
2531 * Disable arbitration, etc. since the host adapter obviously
2532 * lost, and tell an interrupted NCR5380_select() to restart.
2533 */
2534
2535 NCR5380_write(MODE_REG, MR_BASE);
2536 hostdata->restart_select = 1;
2537
2538 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2539
2540 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2541
2542 /*
2543 * At this point, we have detected that our SCSI ID is on the bus,
2544 * SEL is true and BSY was false for at least one bus settle delay
2545 * (400 ns).
2546 *
2547 * We must assert BSY ourselves, until the target drops the SEL
2548 * signal.
2549 */
2550
2551 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2552
2553 while (NCR5380_read(STATUS_REG) & SR_SEL);
2554 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2555
2556 /*
2557 * Wait for target to go into MSGIN.
2558 */
2559
2560 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2561
2562#if 1
2563 // acknowledge toggle to MSGIN
2564 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2565
2566 // peek at the byte without really hitting the bus
2567 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2568#endif
2569
2570 if (!(msg[0] & 0x80)) {
2571 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002572 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 do_abort(instance);
2574 return;
2575 }
2576 lun = (msg[0] & 0x07);
2577
2578 /*
2579 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2580 * just reestablished, and remove it from the disconnected queue.
2581 */
2582
Henne811c9362006-10-03 19:51:59 +02002583 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2585 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2586#ifdef SUPPORT_TAGS
2587 && (tag == tmp->tag)
2588#endif
2589 ) {
2590 if (prev) {
2591 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2592 NEXT(prev) = NEXT(tmp);
2593 } else {
2594 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2595 hostdata->disconnected_queue = NEXT(tmp);
2596 }
2597 NEXT(tmp) = NULL;
2598 break;
2599 }
2600 }
2601
2602 if (!tmp) {
2603 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2604#ifdef SUPPORT_TAGS
2605 "tag %d "
2606#endif
2607 "not in disconnected_queue.\n",
2608 HOSTNO, target_mask, lun
2609#ifdef SUPPORT_TAGS
2610 , tag
2611#endif
2612 );
2613 /*
2614 * Since we have an established nexus that we can't do anything
2615 * with, we must abort it.
2616 */
2617 do_abort(instance);
2618 return;
2619 }
2620#if 1
2621 /* engage dma setup for the command we just saw */
2622 {
2623 void *d;
2624 unsigned long count;
2625
2626 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2627 count = tmp->SCp.buffer->length;
2628 d = SGADDR(tmp->SCp.buffer);
2629 } else {
2630 count = tmp->SCp.this_residual;
2631 d = tmp->SCp.ptr;
2632 }
2633#ifdef REAL_DMA
2634 /* setup this command for dma if not already */
2635 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2636 {
2637 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2638 sun3_dma_setup_done = tmp;
2639 }
2640#endif
2641 }
2642#endif
2643
2644 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2645 /* Accept message by clearing ACK */
2646 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2647
2648#ifdef SUPPORT_TAGS
2649 /* If the phase is still MSGIN, the target wants to send some more
2650 * messages. In case it supports tagged queuing, this is probably a
2651 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2652 */
2653 tag = TAG_NONE;
2654 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2655 /* Accept previous IDENTIFY message by clearing ACK */
2656 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2657 len = 2;
2658 data = msg+1;
2659 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2660 msg[1] == SIMPLE_QUEUE_TAG)
2661 tag = msg[2];
2662 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2663 "reselection\n", HOSTNO, target_mask, lun, tag);
2664 }
2665#endif
2666
2667 hostdata->connected = tmp;
2668 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2669 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2670}
2671
2672
2673/*
Henne811c9362006-10-03 19:51:59 +02002674 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675 *
2676 * Purpose : abort a command
2677 *
Henne811c9362006-10-03 19:51:59 +02002678 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679 * host byte of the result field to, if zero DID_ABORTED is
2680 * used.
2681 *
2682 * Returns : 0 - success, -1 on failure.
2683 *
2684 * XXX - there is no way to abort the command that is currently
2685 * connected, you have to wait for it to complete. If this is
2686 * a problem, we could implement longjmp() / setjmp(), setjmp()
2687 * called where the loop started in NCR5380_main().
2688 */
2689
Henne811c9362006-10-03 19:51:59 +02002690static int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691{
2692 struct Scsi_Host *instance = cmd->device->host;
2693 SETUP_HOSTDATA(instance);
Henne811c9362006-10-03 19:51:59 +02002694 struct scsi_cmnd *tmp, **prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695 unsigned long flags;
2696
2697 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
db9dff32005-04-03 14:53:59 -05002698 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699
2700 NCR5380_print_status (instance);
2701
2702 local_irq_save(flags);
2703
2704 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2705 NCR5380_read(BUS_AND_STATUS_REG),
2706 NCR5380_read(STATUS_REG));
2707
2708#if 1
2709/*
2710 * Case 1 : If the command is the currently executing command,
2711 * we'll set the aborted flag and return control so that
2712 * information transfer routine can exit cleanly.
2713 */
2714
2715 if (hostdata->connected == cmd) {
2716
2717 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2718/*
2719 * We should perform BSY checking, and make sure we haven't slipped
2720 * into BUS FREE.
2721 */
2722
2723/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2724/*
2725 * Since we can't change phases until we've completed the current
2726 * handshake, we have to source or sink a byte of data if the current
2727 * phase is not MSGOUT.
2728 */
2729
2730/*
2731 * Return control to the executing NCR drive so we can clear the
2732 * aborted flag and get back into our main loop.
2733 */
2734
2735 if (do_abort(instance) == 0) {
2736 hostdata->aborted = 1;
2737 hostdata->connected = NULL;
2738 cmd->result = DID_ABORT << 16;
2739#ifdef SUPPORT_TAGS
2740 cmd_free_tag( cmd );
2741#else
2742 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2743#endif
2744 local_irq_restore(flags);
2745 cmd->scsi_done(cmd);
2746 return SCSI_ABORT_SUCCESS;
2747 } else {
2748/* local_irq_restore(flags); */
2749 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2750 return SCSI_ABORT_ERROR;
2751 }
2752 }
2753#endif
2754
2755/*
2756 * Case 2 : If the command hasn't been issued yet, we simply remove it
2757 * from the issue queue.
2758 */
Henne811c9362006-10-03 19:51:59 +02002759 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2760 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2761 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762 if (cmd == tmp) {
2763 REMOVE(5, *prev, tmp, NEXT(tmp));
2764 (*prev) = NEXT(tmp);
2765 NEXT(tmp) = NULL;
2766 tmp->result = DID_ABORT << 16;
2767 local_irq_restore(flags);
2768 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2769 HOSTNO);
2770 /* Tagged queuing note: no tag to free here, hasn't been assigned
2771 * yet... */
2772 tmp->scsi_done(tmp);
2773 return SCSI_ABORT_SUCCESS;
2774 }
2775
2776/*
2777 * Case 3 : If any commands are connected, we're going to fail the abort
2778 * and let the high level SCSI driver retry at a later time or
2779 * issue a reset.
2780 *
2781 * Timeouts, and therefore aborted commands, will be highly unlikely
2782 * and handling them cleanly in this situation would make the common
2783 * case of noresets less efficient, and would pollute our code. So,
2784 * we fail.
2785 */
2786
2787 if (hostdata->connected) {
2788 local_irq_restore(flags);
2789 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2790 return SCSI_ABORT_SNOOZE;
2791 }
2792
2793/*
2794 * Case 4: If the command is currently disconnected from the bus, and
2795 * there are no connected commands, we reconnect the I_T_L or
2796 * I_T_L_Q nexus associated with it, go into message out, and send
2797 * an abort message.
2798 *
2799 * This case is especially ugly. In order to reestablish the nexus, we
2800 * need to call NCR5380_select(). The easiest way to implement this
2801 * function was to abort if the bus was busy, and let the interrupt
2802 * handler triggered on the SEL for reselect take care of lost arbitrations
2803 * where necessary, meaning interrupts need to be enabled.
2804 *
2805 * When interrupts are enabled, the queues may change - so we
2806 * can't remove it from the disconnected queue before selecting it
2807 * because that could cause a failure in hashing the nexus if that
2808 * device reselected.
2809 *
2810 * Since the queues may change, we can't use the pointers from when we
2811 * first locate it.
2812 *
2813 * So, we must first locate the command, and if NCR5380_select()
2814 * succeeds, then issue the abort, relocate the command and remove
2815 * it from the disconnected queue.
2816 */
2817
Henne811c9362006-10-03 19:51:59 +02002818 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819 tmp = NEXT(tmp))
2820 if (cmd == tmp) {
2821 local_irq_restore(flags);
2822 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2823
2824 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2825 return SCSI_ABORT_BUSY;
2826
2827 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2828
2829 do_abort (instance);
2830
2831 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002832 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2833 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2835 if (cmd == tmp) {
2836 REMOVE(5, *prev, tmp, NEXT(tmp));
2837 *prev = NEXT(tmp);
2838 NEXT(tmp) = NULL;
2839 tmp->result = DID_ABORT << 16;
2840 /* We must unlock the tag/LUN immediately here, since the
2841 * target goes to BUS FREE and doesn't send us another
2842 * message (COMMAND_COMPLETE or the like)
2843 */
2844#ifdef SUPPORT_TAGS
2845 cmd_free_tag( tmp );
2846#else
2847 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2848#endif
2849 local_irq_restore(flags);
2850 tmp->scsi_done(tmp);
2851 return SCSI_ABORT_SUCCESS;
2852 }
2853 }
2854
2855/*
2856 * Case 5 : If we reached this point, the command was not found in any of
2857 * the queues.
2858 *
2859 * We probably reached this point because of an unlikely race condition
2860 * between the command completing successfully and the abortion code,
2861 * so we won't panic, but we will notify the user in case something really
2862 * broke.
2863 */
2864
2865 local_irq_restore(flags);
Joe Perchesad361c92009-07-06 13:05:40 -07002866 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867
2868 return SCSI_ABORT_NOT_RUNNING;
2869}
2870
2871
2872/*
Henne811c9362006-10-03 19:51:59 +02002873 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874 *
2875 * Purpose : reset the SCSI bus.
2876 *
2877 * Returns : SCSI_RESET_WAKEUP
2878 *
2879 */
2880
Henne811c9362006-10-03 19:51:59 +02002881static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882{
2883 SETUP_HOSTDATA(cmd->device->host);
2884 int i;
2885 unsigned long flags;
2886#if 1
Henne811c9362006-10-03 19:51:59 +02002887 struct scsi_cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002888#endif
2889
2890
2891 NCR5380_print_status (cmd->device->host);
2892
2893 /* get in phase */
2894 NCR5380_write( TARGET_COMMAND_REG,
2895 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2896 /* assert RST */
2897 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2898 udelay (40);
2899 /* reset NCR registers */
2900 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2901 NCR5380_write( MODE_REG, MR_BASE );
2902 NCR5380_write( TARGET_COMMAND_REG, 0 );
2903 NCR5380_write( SELECT_ENABLE_REG, 0 );
2904 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2905 * through anymore ... */
2906 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2907
2908#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2909 /* XXX see below XXX */
2910
2911 /* MSch: old-style reset: actually abort all command processing here */
2912
2913 /* After the reset, there are no more connected or disconnected commands
2914 * and no busy units; to avoid problems with re-inserting the commands
2915 * into the issue_queue (via scsi_done()), the aborted commands are
2916 * remembered in local variables first.
2917 */
2918 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002919 connected = (struct scsi_cmnd *)hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002920 hostdata->connected = NULL;
Henne811c9362006-10-03 19:51:59 +02002921 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002922 hostdata->disconnected_queue = NULL;
2923#ifdef SUPPORT_TAGS
2924 free_all_tags();
2925#endif
2926 for( i = 0; i < 8; ++i )
2927 hostdata->busy[i] = 0;
2928#ifdef REAL_DMA
2929 hostdata->dma_len = 0;
2930#endif
2931 local_irq_restore(flags);
2932
2933 /* In order to tell the mid-level code which commands were aborted,
2934 * set the command status to DID_RESET and call scsi_done() !!!
2935 * This ultimately aborts processing of these commands in the mid-level.
2936 */
2937
2938 if ((cmd = connected)) {
2939 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2940 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2941 cmd->scsi_done( cmd );
2942 }
2943
2944 for (i = 0; (cmd = disconnected_queue); ++i) {
2945 disconnected_queue = NEXT(cmd);
2946 NEXT(cmd) = NULL;
2947 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2948 cmd->scsi_done( cmd );
2949 }
2950 if (i > 0)
2951 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2952
2953
2954 /* since all commands have been explicitly terminated, we need to tell
2955 * the midlevel code that the reset was SUCCESSFUL, and there is no
2956 * need to 'wake up' the commands by a request_sense
2957 */
2958 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2959#else /* 1 */
2960
2961 /* MSch: new-style reset handling: let the mid-level do what it can */
2962
2963 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2964 * Mid-level is supposed to requeue all commands that were active on the
2965 * various low-level queues. In fact it does this, but that's not enough
2966 * because all these commands are subject to timeout. And if a timeout
2967 * happens for any removed command, *_abort() is called but all queues
2968 * are now empty. Abort then gives up the falcon lock, which is fatal,
2969 * since the mid-level will queue more commands and must have the lock
2970 * (it's all happening inside timer interrupt handler!!).
2971 * Even worse, abort will return NOT_RUNNING for all those commands not
2972 * on any queue, so they won't be retried ...
2973 *
2974 * Conclusion: either scsi.c disables timeout for all resetted commands
2975 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2976 */
2977
2978 /* After the reset, there are no more connected or disconnected commands
2979 * and no busy units; so clear the low-level status here to avoid
2980 * conflicts when the mid-level code tries to wake up the affected
2981 * commands!
2982 */
2983
2984 if (hostdata->issue_queue)
2985 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2986 if (hostdata->connected)
2987 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2988 if (hostdata->disconnected_queue)
2989 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2990
2991 local_irq_save(flags);
2992 hostdata->issue_queue = NULL;
2993 hostdata->connected = NULL;
2994 hostdata->disconnected_queue = NULL;
2995#ifdef SUPPORT_TAGS
2996 free_all_tags();
2997#endif
2998 for( i = 0; i < 8; ++i )
2999 hostdata->busy[i] = 0;
3000#ifdef REAL_DMA
3001 hostdata->dma_len = 0;
3002#endif
3003 local_irq_restore(flags);
3004
3005 /* we did no complete reset of all commands, so a wakeup is required */
3006 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3007#endif /* 1 */
3008}
3009
3010/* Local Variables: */
3011/* tab-width: 8 */
3012/* End: */