blob: 0d04c3a00db9c3ba830d5a15712edaed53399419 [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
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200269#define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
270#define SET_NEXT(cmd, next) ((cmd)->host_scribble = (void *)(next))
271#define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273#define HOSTNO instance->host_no
274#define H_NO(cmd) (cmd)->device->host->host_no
275
Jens Axboe45711f12007-10-22 21:19:53 +0200276#define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278#ifdef SUPPORT_TAGS
279
280/*
281 * Functions for handling tagged queuing
282 * =====================================
283 *
284 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
285 *
286 * Using consecutive numbers for the tags is no good idea in my eyes. There
287 * could be wrong re-usings if the counter (8 bit!) wraps and some early
288 * command has been preempted for a long time. My solution: a bitfield for
289 * remembering used tags.
290 *
291 * There's also the problem that each target has a certain queue size, but we
292 * cannot know it in advance :-( We just see a QUEUE_FULL status being
293 * returned. So, in this case, the driver internal queue size assumption is
294 * reduced to the number of active tags if QUEUE_FULL is returned by the
295 * target. The command is returned to the mid-level, but with status changed
296 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
297 * correctly.
298 *
299 * We're also not allowed running tagged commands as long as an untagged
300 * command is active. And REQUEST SENSE commands after a contingent allegiance
301 * condition _must_ be untagged. To keep track whether an untagged command has
302 * been issued, the host->busy array is still employed, as it is without
303 * support for tagged queuing.
304 *
305 * One could suspect that there are possible race conditions between
306 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
307 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
308 * which already guaranteed to be running at most once. It is also the only
309 * place where tags/LUNs are allocated. So no other allocation can slip
310 * between that pair, there could only happen a reselection, which can free a
311 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
312 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
313 */
314
315/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
316#undef TAG_NONE
317#define TAG_NONE 0xff
318
319/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
320#if (MAX_TAGS % 32) != 0
321#error "MAX_TAGS must be a multiple of 32!"
322#endif
323
324typedef struct {
325 char allocated[MAX_TAGS/8];
326 int nr_allocated;
327 int queue_size;
328} TAG_ALLOC;
329
330static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
331
332
333static void __init init_tags( void )
334{
335 int target, lun;
336 TAG_ALLOC *ta;
337
338 if (!setup_use_tagged_queuing)
339 return;
340
341 for( target = 0; target < 8; ++target ) {
342 for( lun = 0; lun < 8; ++lun ) {
343 ta = &TagAlloc[target][lun];
344 memset( &ta->allocated, 0, MAX_TAGS/8 );
345 ta->nr_allocated = 0;
346 /* At the beginning, assume the maximum queue size we could
347 * support (MAX_TAGS). This value will be decreased if the target
348 * returns QUEUE_FULL status.
349 */
350 ta->queue_size = MAX_TAGS;
351 }
352 }
353}
354
355
356/* Check if we can issue a command to this LUN: First see if the LUN is marked
357 * busy by an untagged command. If the command should use tagged queuing, also
358 * check that there is a free tag and the target's queue won't overflow. This
359 * function should be called with interrupts disabled to avoid race
360 * conditions.
361 */
362
Henne811c9362006-10-03 19:51:59 +0200363static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365 SETUP_HOSTDATA(cmd->device->host);
366
367 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
368 return( 1 );
369 if (!should_be_tagged ||
370 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
371 return( 0 );
372 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
373 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
374 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
375 H_NO(cmd), cmd->device->id, cmd->device->lun );
376 return( 1 );
377 }
378 return( 0 );
379}
380
381
382/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
383 * must be called before!), or reserve the LUN in 'busy' if the command is
384 * untagged.
385 */
386
Henne811c9362006-10-03 19:51:59 +0200387static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
389 SETUP_HOSTDATA(cmd->device->host);
390
391 /* If we or the target don't support tagged queuing, allocate the LUN for
392 * an untagged command.
393 */
394 if (!should_be_tagged ||
395 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
396 cmd->tag = TAG_NONE;
397 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
398 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
399 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
400 }
401 else {
402 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
403
404 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
405 set_bit( cmd->tag, &ta->allocated );
406 ta->nr_allocated++;
407 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
408 "(now %d tags in use)\n",
409 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
410 ta->nr_allocated );
411 }
412}
413
414
415/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
416 * unlock the LUN.
417 */
418
Henne811c9362006-10-03 19:51:59 +0200419static void cmd_free_tag(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
421 SETUP_HOSTDATA(cmd->device->host);
422
423 if (cmd->tag == TAG_NONE) {
424 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
425 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
426 H_NO(cmd), cmd->device->id, cmd->device->lun );
427 }
428 else if (cmd->tag >= MAX_TAGS) {
429 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
430 H_NO(cmd), cmd->tag );
431 }
432 else {
433 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
434 clear_bit( cmd->tag, &ta->allocated );
435 ta->nr_allocated--;
436 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
437 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
438 }
439}
440
441
442static void free_all_tags( void )
443{
444 int target, lun;
445 TAG_ALLOC *ta;
446
447 if (!setup_use_tagged_queuing)
448 return;
449
450 for( target = 0; target < 8; ++target ) {
451 for( lun = 0; lun < 8; ++lun ) {
452 ta = &TagAlloc[target][lun];
453 memset( &ta->allocated, 0, MAX_TAGS/8 );
454 ta->nr_allocated = 0;
455 }
456 }
457}
458
459#endif /* SUPPORT_TAGS */
460
461
462/*
Henne811c9362006-10-03 19:51:59 +0200463 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 *
465 * Purpose: Try to merge several scatter-gather requests into one DMA
466 * transfer. This is possible if the scatter buffers lie on
467 * physical contiguous addresses.
468 *
Henne811c9362006-10-03 19:51:59 +0200469 * Parameters: struct scsi_cmnd *cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 * The command to work on. The first scatter buffer's data are
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300471 * assumed to be already transferred into ptr/this_residual.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 */
473
Henne811c9362006-10-03 19:51:59 +0200474static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 unsigned long endaddr;
477#if (NDEBUG & NDEBUG_MERGING)
478 unsigned long oldlen = cmd->SCp.this_residual;
479 int cnt = 1;
480#endif
481
482 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
483 cmd->SCp.buffers_residual &&
484 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
485
486 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
487 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
488#if (NDEBUG & NDEBUG_MERGING)
489 ++cnt;
490#endif
491 ++cmd->SCp.buffer;
492 --cmd->SCp.buffers_residual;
493 cmd->SCp.this_residual += cmd->SCp.buffer->length;
494 endaddr += cmd->SCp.buffer->length;
495 }
496#if (NDEBUG & NDEBUG_MERGING)
497 if (oldlen != cmd->SCp.this_residual)
498 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
499 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
500#endif
501}
502
503/*
Henne811c9362006-10-03 19:51:59 +0200504 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 *
506 * Purpose : initialize the saved data pointers for cmd to point to the
507 * start of the buffer.
508 *
Henne811c9362006-10-03 19:51:59 +0200509 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 */
511
Henne811c9362006-10-03 19:51:59 +0200512static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
514 /*
515 * Initialize the Scsi Pointer field so that all of the commands in the
516 * various queues are valid.
517 */
518
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200519 if (scsi_bufflen(cmd)) {
520 cmd->SCp.buffer = scsi_sglist(cmd);
521 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
523 cmd->SCp.this_residual = cmd->SCp.buffer->length;
524
525 /* ++roman: Try to merge some scatter-buffers if they are at
526 * contiguous physical addresses.
527 */
528// merge_contiguous_buffers( cmd );
529 } else {
530 cmd->SCp.buffer = NULL;
531 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200532 cmd->SCp.ptr = NULL;
533 cmd->SCp.this_residual = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 }
535
536}
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538#include <linux/delay.h>
539
540#if 1
541static struct {
542 unsigned char mask;
543 const char * name;}
544signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
545 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
546 { SR_SEL, "SEL" }, {0, NULL}},
547basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
548icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
549 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
550 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
551 {0, NULL}},
552mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
553 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
554 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
555 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
556 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
557 {0, NULL}};
558
559/*
560 * Function : void NCR5380_print(struct Scsi_Host *instance)
561 *
562 * Purpose : print the SCSI bus signals for debugging purposes
563 *
564 * Input : instance - which NCR5380
565 */
566
567static void NCR5380_print(struct Scsi_Host *instance) {
568 unsigned char status, data, basr, mr, icr, i;
569 unsigned long flags;
570
571 local_irq_save(flags);
572 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
573 status = NCR5380_read(STATUS_REG);
574 mr = NCR5380_read(MODE_REG);
575 icr = NCR5380_read(INITIATOR_COMMAND_REG);
576 basr = NCR5380_read(BUS_AND_STATUS_REG);
577 local_irq_restore(flags);
578 printk("STATUS_REG: %02x ", status);
579 for (i = 0; signals[i].mask ; ++i)
580 if (status & signals[i].mask)
581 printk(",%s", signals[i].name);
582 printk("\nBASR: %02x ", basr);
583 for (i = 0; basrs[i].mask ; ++i)
584 if (basr & basrs[i].mask)
585 printk(",%s", basrs[i].name);
586 printk("\nICR: %02x ", icr);
587 for (i = 0; icrs[i].mask; ++i)
588 if (icr & icrs[i].mask)
589 printk(",%s", icrs[i].name);
590 printk("\nMODE: %02x ", mr);
591 for (i = 0; mrs[i].mask; ++i)
592 if (mr & mrs[i].mask)
593 printk(",%s", mrs[i].name);
594 printk("\n");
595}
596
597static struct {
598 unsigned char value;
599 const char *name;
600} phases[] = {
601 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
602 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
603 {PHASE_UNKNOWN, "UNKNOWN"}};
604
605/*
606 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 *
608 * Purpose : print the current SCSI phase for debugging purposes
609 *
610 * Input : instance - which NCR5380
611 */
612
613static void NCR5380_print_phase(struct Scsi_Host *instance)
614{
615 unsigned char status;
616 int i;
617
618 status = NCR5380_read(STATUS_REG);
619 if (!(status & SR_REQ))
620 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
621 else {
622 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
623 (phases[i].value != (status & PHASE_MASK)); ++i);
624 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
625 }
626}
627
628#else /* !NDEBUG */
629
630/* dummies... */
631__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
632__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
633
634#endif
635
636/*
637 * ++roman: New scheme of calling NCR5380_main()
638 *
639 * If we're not in an interrupt, we can call our main directly, it cannot be
640 * already running. Else, we queue it on a task queue, if not 'main_running'
641 * tells us that a lower level is already executing it. This way,
642 * 'main_running' needs not be protected in a special way.
643 *
644 * queue_main() is a utility function for putting our main onto the task
645 * queue, if main_running is false. It should be called only from a
646 * interrupt or bottom half.
647 */
648
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900649#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650#include <linux/workqueue.h>
651#include <linux/interrupt.h>
652
653static volatile int main_running = 0;
Al Viro2bb71b52006-12-14 15:00:15 +0000654static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656static __inline__ void queue_main(void)
657{
658 if (!main_running) {
659 /* If in interrupt and NCR5380_main() not already running,
660 queue it on the 'immediate' task queue, to be processed
661 immediately after the current interrupt processing has
662 finished. */
663 schedule_work(&NCR5380_tqueue);
664 }
665 /* else: nothing to do: the running NCR5380_main() will pick up
666 any newly queued command. */
667}
668
669
670static inline void NCR5380_all_init (void)
671{
672 static int done = 0;
673 if (!done) {
674 INI_PRINTK("scsi : NCR5380_all_init()\n");
675 done = 1;
676 }
677}
678
679
680/*
681 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
682 *
683 * Purpose : called by probe code indicating the NCR5380 driver
684 * options that were selected.
685 *
686 * Inputs : instance, pointer to this instance. Unused.
687 */
688
689static void __init NCR5380_print_options (struct Scsi_Host *instance)
690{
691 printk(" generic options"
692#ifdef AUTOSENSE
693 " AUTOSENSE"
694#endif
695#ifdef REAL_DMA
696 " REAL DMA"
697#endif
698#ifdef PARITY
699 " PARITY"
700#endif
701#ifdef SUPPORT_TAGS
702 " SCSI-2 TAGGED QUEUING"
703#endif
704 );
705 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
706}
707
708/*
709 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
710 *
711 * Purpose : print commands in the various queues, called from
712 * NCR5380_abort and NCR5380_debug to aid debugging.
713 *
714 * Inputs : instance, pointer to this instance.
715 */
716
717static void NCR5380_print_status (struct Scsi_Host *instance)
718{
719 char *pr_bfr;
720 char *start;
721 int len;
722
723 NCR_PRINT(NDEBUG_ANY);
724 NCR_PRINT_PHASE(NDEBUG_ANY);
725
726 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
727 if (!pr_bfr) {
728 printk("NCR5380_print_status: no memory for print buffer\n");
729 return;
730 }
731 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
732 pr_bfr[len] = 0;
733 printk("\n%s\n", pr_bfr);
734 free_page((unsigned long) pr_bfr);
735}
736
737
738/******************************************/
739/*
740 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
741 *
742 * *buffer: I/O buffer
743 * **start: if inout == FALSE pointer into buffer where user read should start
744 * offset: current offset
745 * length: length of buffer
746 * hostno: Scsi_Host host_no
747 * inout: TRUE - user is writing; FALSE - user is reading
748 *
749 * Return the number of bytes read from or written
750*/
751
752#undef SPRINTF
753#define SPRINTF(fmt,args...) \
754 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
755 pos += sprintf(pos, fmt , ## args); } while(0)
756static
Henne811c9362006-10-03 19:51:59 +0200757char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
758 int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Henne811c9362006-10-03 19:51:59 +0200760static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
761 char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762{
763 char *pos = buffer;
764 struct NCR5380_hostdata *hostdata;
Henne811c9362006-10-03 19:51:59 +0200765 struct scsi_cmnd *ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 unsigned long flags;
767 off_t begin = 0;
768#define check_offset() \
769 do { \
770 if (pos - buffer < offset - begin) { \
771 begin += pos - buffer; \
772 pos = buffer; \
773 } \
774 } while (0)
775
776 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
777
778 if (inout) { /* Has data been written to the file ? */
779 return(-ENOSYS); /* Currently this is a no-op */
780 }
781 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
782 check_offset();
783 local_irq_save(flags);
784 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
785 check_offset();
786 if (!hostdata->connected)
787 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
788 else
Henne811c9362006-10-03 19:51:59 +0200789 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 pos, buffer, length);
791 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
792 check_offset();
Henne811c9362006-10-03 19:51:59 +0200793 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
794 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
796 check_offset();
797 }
798
799 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
800 check_offset();
Henne811c9362006-10-03 19:51:59 +0200801 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 ptr = NEXT(ptr)) {
803 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
804 check_offset();
805 }
806
807 local_irq_restore(flags);
808 *start = buffer + (offset - begin);
809 if (pos - buffer < offset - begin)
810 return 0;
811 else if (pos - buffer - (offset - begin) < length)
812 return pos - buffer - (offset - begin);
813 return length;
814}
815
Henne811c9362006-10-03 19:51:59 +0200816static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
817 int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818{
819 int i, s;
820 unsigned char *command;
821 SPRINTF("scsi%d: destination target %d, lun %d\n",
822 H_NO(cmd), cmd->device->id, cmd->device->lun);
823 SPRINTF(" command = ");
824 command = cmd->cmnd;
825 SPRINTF("%2d (0x%02x)", command[0], command[0]);
826 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
827 SPRINTF(" %02x", command[i]);
828 SPRINTF("\n");
829 return pos;
830}
831
832
833/*
834 * Function : void NCR5380_init (struct Scsi_Host *instance)
835 *
836 * Purpose : initializes *instance and corresponding 5380 chip.
837 *
838 * Inputs : instance - instantiation of the 5380 driver.
839 *
840 * Notes : I assume that the host, hostno, and id bits have been
841 * set correctly. I don't care about the irq and other fields.
842 *
843 */
844
Geert Uytterhoevend559c492011-06-13 20:39:18 +0200845static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846{
847 int i;
848 SETUP_HOSTDATA(instance);
849
850 NCR5380_all_init();
851
852 hostdata->aborted = 0;
853 hostdata->id_mask = 1 << instance->this_id;
854 hostdata->id_higher_mask = 0;
855 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
856 if (i > hostdata->id_mask)
857 hostdata->id_higher_mask |= i;
858 for (i = 0; i < 8; ++i)
859 hostdata->busy[i] = 0;
860#ifdef SUPPORT_TAGS
861 init_tags();
862#endif
863#if defined (REAL_DMA)
864 hostdata->dma_len = 0;
865#endif
866 hostdata->targets_present = 0;
867 hostdata->connected = NULL;
868 hostdata->issue_queue = NULL;
869 hostdata->disconnected_queue = NULL;
870 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
871
872 if (!the_template) {
873 the_template = instance->hostt;
874 first_instance = instance;
875 }
876
877
878#ifndef AUTOSENSE
879 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
880 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
881 " without AUTOSENSE option, contingent allegiance conditions may\n"
882 " be incorrectly cleared.\n", HOSTNO);
883#endif /* def AUTOSENSE */
884
885 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
886 NCR5380_write(MODE_REG, MR_BASE);
887 NCR5380_write(TARGET_COMMAND_REG, 0);
888 NCR5380_write(SELECT_ENABLE_REG, 0);
889
890 return 0;
891}
892
893/*
Henne811c9362006-10-03 19:51:59 +0200894 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
895 * void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 *
897 * Purpose : enqueues a SCSI command
898 *
899 * Inputs : cmd - SCSI command, done - function called on completion, with
900 * a pointer to the command descriptor.
901 *
902 * Returns : 0
903 *
904 * Side effects :
905 * cmd is added to the per instance issue_queue, with minor
906 * twiddling done to the host specific fields of cmd. If the
907 * main coroutine is not running, it is restarted.
908 *
909 */
910
911/* Only make static if a wrapper function is used */
Jeff Garzikf2812332010-11-16 02:10:29 -0500912static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd,
Henne811c9362006-10-03 19:51:59 +0200913 void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914{
915 SETUP_HOSTDATA(cmd->device->host);
Henne811c9362006-10-03 19:51:59 +0200916 struct scsi_cmnd *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 unsigned long flags;
918
919#if (NDEBUG & NDEBUG_NO_WRITE)
920 switch (cmd->cmnd[0]) {
921 case WRITE_6:
922 case WRITE_10:
923 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
924 H_NO(cmd));
925 cmd->result = (DID_ERROR << 16);
926 done(cmd);
927 return 0;
928 }
929#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
930
931
932#ifdef NCR5380_STATS
933# if 0
934 if (!hostdata->connected && !hostdata->issue_queue &&
935 !hostdata->disconnected_queue) {
936 hostdata->timebase = jiffies;
937 }
938# endif
939# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200940 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941# endif
942 switch (cmd->cmnd[0])
943 {
944 case WRITE:
945 case WRITE_6:
946 case WRITE_10:
947 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200948 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 hostdata->pendingw++;
950 break;
951 case READ:
952 case READ_6:
953 case READ_10:
954 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200955 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 hostdata->pendingr++;
957 break;
958 }
959#endif
960
961 /*
962 * We use the host_scribble field as a pointer to the next command
963 * in a queue
964 */
965
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200966 SET_NEXT(cmd, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 cmd->scsi_done = done;
968
969 cmd->result = 0;
970
971
972 /*
973 * Insert the cmd into the issue queue. Note that REQUEST SENSE
974 * commands are added to the head of the queue since any command will
975 * clear the contingent allegiance condition that exists and the
976 * sense data is only guaranteed to be valid while the condition exists.
977 */
978
979 local_irq_save(flags);
980 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
981 * Otherwise a running NCR5380_main may steal the lock.
982 * Lock before actually inserting due to fairness reasons explained in
983 * atari_scsi.c. If we insert first, then it's impossible for this driver
984 * to release the lock.
985 * Stop timer for this command while waiting for the lock, or timeouts
986 * may happen (and they really do), and it's no good if the command doesn't
987 * appear in any of the queues.
988 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
989 * because also a timer int can trigger an abort or reset, which would
990 * alter queues and touch the lock.
991 */
992 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
993 LIST(cmd, hostdata->issue_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200994 SET_NEXT(cmd, hostdata->issue_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 hostdata->issue_queue = cmd;
996 } else {
Henne811c9362006-10-03 19:51:59 +0200997 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 NEXT(tmp); tmp = NEXT(tmp))
999 ;
1000 LIST(cmd, tmp);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001001 SET_NEXT(tmp, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 }
1003
1004 local_irq_restore(flags);
1005
1006 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1007 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1008
1009 /* If queue_command() is called from an interrupt (real one or bottom
1010 * half), we let queue_main() do the job of taking care about main. If it
1011 * is already running, this is a no-op, else main will be queued.
1012 *
1013 * If we're not in an interrupt, we can call NCR5380_main()
1014 * unconditionally, because it cannot be already running.
1015 */
1016 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1017 queue_main();
1018 else
1019 NCR5380_main(NULL);
1020 return 0;
1021}
1022
Jeff Garzikf2812332010-11-16 02:10:29 -05001023static DEF_SCSI_QCMD(NCR5380_queue_command)
1024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025/*
1026 * Function : NCR5380_main (void)
1027 *
1028 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1029 * be done on the NCR5380 host adapters in a system. Both
1030 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1031 * in case it is not running.
1032 *
1033 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1034 * reenable them. This prevents reentrancy and kernel stack overflow.
1035 */
1036
Al Viro2bb71b52006-12-14 15:00:15 +00001037static void NCR5380_main (struct work_struct *bl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038{
Henne811c9362006-10-03 19:51:59 +02001039 struct scsi_cmnd *tmp, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 struct Scsi_Host *instance = first_instance;
1041 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1042 int done;
1043 unsigned long flags;
1044
1045 /*
1046 * We run (with interrupts disabled) until we're sure that none of
1047 * the host adapters have anything that can be done, at which point
1048 * we set main_running to 0 and exit.
1049 *
1050 * Interrupts are enabled before doing various other internal
1051 * instructions, after we've decided that we need to run through
1052 * the loop again.
1053 *
1054 * this should prevent any race conditions.
1055 *
1056 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1057 * because also a timer int can trigger an abort or reset, which can
1058 * alter queues and touch the Falcon lock.
1059 */
1060
1061 /* Tell int handlers main() is now already executing. Note that
1062 no races are possible here. If an int comes in before
1063 'main_running' is set here, and queues/executes main via the
1064 task queue, it doesn't do any harm, just this instance of main
1065 won't find any work left to do. */
1066 if (main_running)
1067 return;
1068 main_running = 1;
1069
1070 local_save_flags(flags);
1071 do {
1072 local_irq_disable(); /* Freeze request queues */
1073 done = 1;
1074
1075 if (!hostdata->connected) {
1076 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1077 /*
1078 * Search through the issue_queue for a command destined
1079 * for a target that's not busy.
1080 */
1081#if (NDEBUG & NDEBUG_LISTS)
Henne811c9362006-10-03 19:51:59 +02001082 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1084 ;
1085 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1086#endif
Henne811c9362006-10-03 19:51:59 +02001087 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1089
1090#if (NDEBUG & NDEBUG_LISTS)
1091 if (prev != tmp)
1092 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1093 tmp, tmp->target, hostdata->busy[tmp->target],
1094 tmp->lun);
1095#endif
1096 /* When we find one, remove it from the issue queue. */
1097 /* ++guenther: possible race with Falcon locking */
1098 if (
1099#ifdef SUPPORT_TAGS
1100 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1101#else
1102 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1103#endif
1104 ) {
1105 /* ++guenther: just to be sure, this must be atomic */
1106 local_irq_disable();
1107 if (prev) {
1108 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001109 SET_NEXT(prev, NEXT(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 } else {
1111 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1112 hostdata->issue_queue = NEXT(tmp);
1113 }
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001114 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
1116 /* reenable interrupts after finding one */
1117 local_irq_restore(flags);
1118
1119 /*
1120 * Attempt to establish an I_T_L nexus here.
1121 * On success, instance->hostdata->connected is set.
1122 * On failure, we must add the command back to the
1123 * issue queue so we can keep trying.
1124 */
1125 MAIN_PRINTK("scsi%d: main(): command for target %d "
1126 "lun %d removed from issue_queue\n",
1127 HOSTNO, tmp->target, tmp->lun);
1128 /*
1129 * REQUEST SENSE commands are issued without tagged
1130 * queueing, even on SCSI-II devices because the
1131 * contingent allegiance condition exists for the
1132 * entire unit.
1133 */
1134 /* ++roman: ...and the standard also requires that
1135 * REQUEST SENSE command are untagged.
1136 */
1137
1138#ifdef SUPPORT_TAGS
1139 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1140#endif
1141 if (!NCR5380_select(instance, tmp,
1142 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1143 TAG_NEXT)) {
1144 break;
1145 } else {
1146 local_irq_disable();
1147 LIST(tmp, hostdata->issue_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001148 SET_NEXT(tmp, hostdata->issue_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 hostdata->issue_queue = tmp;
1150#ifdef SUPPORT_TAGS
1151 cmd_free_tag( tmp );
1152#endif
1153 local_irq_restore(flags);
1154 MAIN_PRINTK("scsi%d: main(): select() failed, "
1155 "returned to issue_queue\n", HOSTNO);
1156 if (hostdata->connected)
1157 break;
1158 }
1159 } /* if target/lun/target queue is not busy */
1160 } /* for issue_queue */
1161 } /* if (!hostdata->connected) */
1162 if (hostdata->connected
1163#ifdef REAL_DMA
1164 && !hostdata->dma_len
1165#endif
1166 ) {
1167 local_irq_restore(flags);
1168 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1169 HOSTNO);
1170 NCR5380_information_transfer(instance);
1171 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1172 done = 0;
1173 }
1174 } while (!done);
1175
1176 /* Better allow ints _after_ 'main_running' has been cleared, else
1177 an interrupt could believe we'll pick up the work it left for
1178 us, but we won't see it anymore here... */
1179 main_running = 0;
1180 local_irq_restore(flags);
1181}
1182
1183
1184#ifdef REAL_DMA
1185/*
1186 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1187 *
1188 * Purpose : Called by interrupt handler when DMA finishes or a phase
1189 * mismatch occurs (which would finish the DMA transfer).
1190 *
1191 * Inputs : instance - this instance of the NCR5380.
1192 *
1193 */
1194
1195static void NCR5380_dma_complete( struct Scsi_Host *instance )
1196{
1197 SETUP_HOSTDATA(instance);
1198 int transfered;
1199 unsigned char **data;
1200 volatile int *count;
1201
1202 if (!hostdata->connected) {
1203 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1204 "no connected cmd\n", HOSTNO);
1205 return;
1206 }
1207
1208 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1209 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1210 NCR5380_read(STATUS_REG));
1211
1212 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1213 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1214 printk("please e-mail sammy@sammy.net with a description of how this\n");
1215 printk("error was produced.\n");
1216 BUG();
1217 }
1218
1219 /* make sure we're not stuck in a data phase */
1220 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1221 BASR_ACK)) ==
1222 (BASR_PHASE_MATCH | BASR_ACK)) {
1223 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1224 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1225 "overrun!\n", HOSTNO);
1226 printk("not prepared for this error!\n");
1227 printk("please e-mail sammy@sammy.net with a description of how this\n");
1228 printk("error was produced.\n");
1229 BUG();
1230 }
1231
1232
1233
1234 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1235 NCR5380_write(MODE_REG, MR_BASE);
1236 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1237
1238 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1239 hostdata->dma_len = 0;
1240
1241 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1242 count = &(hostdata->connected->SCp.this_residual);
1243 *data += transfered;
1244 *count -= transfered;
1245
1246}
1247#endif /* REAL_DMA */
1248
1249
1250/*
1251 * Function : void NCR5380_intr (int irq)
1252 *
1253 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1254 * from the disconnected queue, and restarting NCR5380_main()
1255 * as required.
1256 *
1257 * Inputs : int irq, irq that caused this interrupt.
1258 *
1259 */
1260
David Howells7d12e782006-10-05 14:55:46 +01001261static irqreturn_t NCR5380_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262{
1263 struct Scsi_Host *instance = first_instance;
1264 int done = 1, handled = 0;
1265 unsigned char basr;
1266
1267 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1268
1269 /* Look for pending interrupts */
1270 basr = NCR5380_read(BUS_AND_STATUS_REG);
1271 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1272 /* dispatch to appropriate routine if found and done=0 */
1273 if (basr & BASR_IRQ) {
1274 NCR_PRINT(NDEBUG_INTR);
1275 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1276 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001277// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1279 NCR5380_reselect(instance);
1280 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1281 }
1282 else if (basr & BASR_PARITY_ERROR) {
1283 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1284 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1285 }
1286 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1287 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1288 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1289 }
1290 else {
1291 /*
1292 * The rest of the interrupt conditions can occur only during a
1293 * DMA transfer
1294 */
1295
1296#if defined(REAL_DMA)
1297 /*
1298 * We should only get PHASE MISMATCH and EOP interrupts if we have
1299 * DMA enabled, so do a sanity check based on the current setting
1300 * of the MODE register.
1301 */
1302
1303 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1304 ((basr & BASR_END_DMA_TRANSFER) ||
1305 !(basr & BASR_PHASE_MATCH))) {
1306
1307 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1308 NCR5380_dma_complete( instance );
1309 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001310// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 } else
1312#endif /* REAL_DMA */
1313 {
1314/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1315 if (basr & BASR_PHASE_MATCH)
1316 INT_PRINTK("scsi%d: unknown interrupt, "
1317 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1318 HOSTNO, basr, NCR5380_read(MODE_REG),
1319 NCR5380_read(STATUS_REG));
1320 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1321#ifdef SUN3_SCSI_VME
1322 dregs->csr |= CSR_DMA_ENABLE;
1323#endif
1324 }
1325 } /* if !(SELECTION || PARITY) */
1326 handled = 1;
1327 } /* BASR & IRQ */
1328 else {
1329
1330 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1331 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1332 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1333 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1334#ifdef SUN3_SCSI_VME
1335 dregs->csr |= CSR_DMA_ENABLE;
1336#endif
1337 }
1338
1339 if (!done) {
1340 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1341 /* Put a call to NCR5380_main() on the queue... */
1342 queue_main();
1343 }
1344 return IRQ_RETVAL(handled);
1345}
1346
1347#ifdef NCR5380_STATS
Henne811c9362006-10-03 19:51:59 +02001348static void collect_stats(struct NCR5380_hostdata *hostdata,
1349 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350{
1351# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001352 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353# endif
1354 switch (cmd->cmnd[0])
1355 {
1356 case WRITE:
1357 case WRITE_6:
1358 case WRITE_10:
1359 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001360 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 hostdata->pendingw--;
1362 break;
1363 case READ:
1364 case READ_6:
1365 case READ_10:
1366 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001367 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 hostdata->pendingr--;
1369 break;
1370 }
1371}
1372#endif
1373
1374/*
Henne811c9362006-10-03 19:51:59 +02001375 * Function : int NCR5380_select(struct Scsi_Host *instance,
1376 * struct scsi_cmnd *cmd, int tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 *
1378 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1379 * including ARBITRATION, SELECTION, and initial message out for
1380 * IDENTIFY and queue messages.
1381 *
1382 * Inputs : instance - instantiation of the 5380 driver on which this
1383 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1384 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1385 * the command that is presently connected.
1386 *
1387 * Returns : -1 if selection could not execute for some reason,
1388 * 0 if selection succeeded or failed because the target
1389 * did not respond.
1390 *
1391 * Side effects :
1392 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1393 * with registers as they should have been on entry - ie
1394 * SELECT_ENABLE will be set appropriately, the NCR5380
1395 * will cease to drive any SCSI bus signals.
1396 *
1397 * If successful : I_T_L or I_T_L_Q nexus will be established,
1398 * instance->connected will be set to cmd.
1399 * SELECT interrupt will be disabled.
1400 *
1401 * If failed (no target) : cmd->scsi_done() will be called, and the
1402 * cmd->result host byte set to DID_BAD_TARGET.
1403 */
1404
Henne811c9362006-10-03 19:51:59 +02001405static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1406 int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407{
1408 SETUP_HOSTDATA(instance);
1409 unsigned char tmp[3], phase;
1410 unsigned char *data;
1411 int len;
1412 unsigned long timeout;
1413 unsigned long flags;
1414
1415 hostdata->restart_select = 0;
1416 NCR_PRINT(NDEBUG_ARBITRATION);
1417 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1418 instance->this_id);
1419
1420 /*
1421 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1422 * data bus during SELECTION.
1423 */
1424
1425 local_irq_save(flags);
1426 if (hostdata->connected) {
1427 local_irq_restore(flags);
1428 return -1;
1429 }
1430 NCR5380_write(TARGET_COMMAND_REG, 0);
1431
1432
1433 /*
1434 * Start arbitration.
1435 */
1436
1437 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1438 NCR5380_write(MODE_REG, MR_ARBITRATE);
1439
1440 local_irq_restore(flags);
1441
1442 /* Wait for arbitration logic to complete */
1443#if NCR_TIMEOUT
1444 {
1445 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1446
1447 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1448 && time_before(jiffies, timeout) && !hostdata->connected)
1449 ;
1450 if (time_after_eq(jiffies, timeout))
1451 {
1452 printk("scsi : arbitration timeout at %d\n", __LINE__);
1453 NCR5380_write(MODE_REG, MR_BASE);
1454 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1455 return -1;
1456 }
1457 }
1458#else /* NCR_TIMEOUT */
1459 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1460 && !hostdata->connected);
1461#endif
1462
1463 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1464
1465 if (hostdata->connected) {
1466 NCR5380_write(MODE_REG, MR_BASE);
1467 return -1;
1468 }
1469 /*
1470 * The arbitration delay is 2.2us, but this is a minimum and there is
1471 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1472 * the integral nature of udelay().
1473 *
1474 */
1475
1476 udelay(3);
1477
1478 /* Check for lost arbitration */
1479 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1480 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1481 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1482 hostdata->connected) {
1483 NCR5380_write(MODE_REG, MR_BASE);
1484 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1485 HOSTNO);
1486 return -1;
1487 }
1488
1489 /* after/during arbitration, BSY should be asserted.
1490 IBM DPES-31080 Version S31Q works now */
1491 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1492 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1493 ICR_ASSERT_BSY ) ;
1494
1495 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1496 hostdata->connected) {
1497 NCR5380_write(MODE_REG, MR_BASE);
1498 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1499 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1500 HOSTNO);
1501 return -1;
1502 }
1503
1504 /*
1505 * Again, bus clear + bus settle time is 1.2us, however, this is
1506 * a minimum so we'll udelay ceil(1.2)
1507 */
1508
1509#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1510 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1511 udelay(15);
1512#else
1513 udelay(2);
1514#endif
1515
1516 if (hostdata->connected) {
1517 NCR5380_write(MODE_REG, MR_BASE);
1518 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1519 return -1;
1520 }
1521
1522 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1523
1524 /*
1525 * Now that we have won arbitration, start Selection process, asserting
1526 * the host and target ID's on the SCSI bus.
1527 */
1528
1529 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1530
1531 /*
1532 * Raise ATN while SEL is true before BSY goes false from arbitration,
1533 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1534 * phase immediately after selection.
1535 */
1536
1537 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1538 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1539 NCR5380_write(MODE_REG, MR_BASE);
1540
1541 /*
1542 * Reselect interrupts must be turned off prior to the dropping of BSY,
1543 * otherwise we will trigger an interrupt.
1544 */
1545
1546 if (hostdata->connected) {
1547 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1548 return -1;
1549 }
1550
1551 NCR5380_write(SELECT_ENABLE_REG, 0);
1552
1553 /*
1554 * The initiator shall then wait at least two deskew delays and release
1555 * the BSY signal.
1556 */
1557 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1558
1559 /* Reset BSY */
1560 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1561 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1562
1563 /*
1564 * Something weird happens when we cease to drive BSY - looks
1565 * like the board/chip is letting us do another read before the
1566 * appropriate propagation delay has expired, and we're confusing
1567 * a BSY signal from ourselves as the target's response to SELECTION.
1568 *
1569 * A small delay (the 'C++' frontend breaks the pipeline with an
1570 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1571 * tighter 'C' code breaks and requires this) solves the problem -
1572 * the 1 us delay is arbitrary, and only used because this delay will
1573 * be the same on other platforms and since it works here, it should
1574 * work there.
1575 *
1576 * wingel suggests that this could be due to failing to wait
1577 * one deskew delay.
1578 */
1579
1580 udelay(1);
1581
1582 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1583
1584 /*
1585 * The SCSI specification calls for a 250 ms timeout for the actual
1586 * selection.
1587 */
1588
1589 timeout = jiffies + 25;
1590
1591 /*
1592 * XXX very interesting - we're seeing a bounce where the BSY we
1593 * asserted is being reflected / still asserted (propagation delay?)
1594 * and it's detecting as true. Sigh.
1595 */
1596
1597#if 0
1598 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1599 * IO while SEL is true. But again, there are some disks out the in the
1600 * world that do that nevertheless. (Somebody claimed that this announces
1601 * reselection capability of the target.) So we better skip that test and
Jan Engelhardt96de0e22007-10-19 23:21:04 +02001602 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 */
1604
1605 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1606 (SR_BSY | SR_IO)));
1607
1608 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1609 (SR_SEL | SR_IO)) {
1610 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1611 NCR5380_reselect(instance);
1612 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1613 HOSTNO);
1614 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1615 return -1;
1616 }
1617#else
1618 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1619#endif
1620
1621 /*
1622 * No less than two deskew delays after the initiator detects the
1623 * BSY signal is true, it shall release the SEL signal and may
1624 * change the DATA BUS. -wingel
1625 */
1626
1627 udelay(1);
1628
1629 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1630
1631 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1632 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1633 if (hostdata->targets_present & (1 << cmd->device->id)) {
1634 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1635 if (hostdata->restart_select)
1636 printk(KERN_NOTICE "\trestart select\n");
1637 NCR_PRINT(NDEBUG_ANY);
1638 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1639 return -1;
1640 }
1641 cmd->result = DID_BAD_TARGET << 16;
1642#ifdef NCR5380_STATS
1643 collect_stats(hostdata, cmd);
1644#endif
1645#ifdef SUPPORT_TAGS
1646 cmd_free_tag( cmd );
1647#endif
1648 cmd->scsi_done(cmd);
1649 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1650 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1651 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1652 return 0;
1653 }
1654
1655 hostdata->targets_present |= (1 << cmd->device->id);
1656
1657 /*
1658 * Since we followed the SCSI spec, and raised ATN while SEL
1659 * was true but before BSY was false during selection, the information
1660 * transfer phase should be a MESSAGE OUT phase so that we can send the
1661 * IDENTIFY message.
1662 *
1663 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1664 * message (2 bytes) with a tag ID that we increment with every command
1665 * until it wraps back to 0.
1666 *
1667 * XXX - it turns out that there are some broken SCSI-II devices,
1668 * which claim to support tagged queuing but fail when more than
1669 * some number of commands are issued at once.
1670 */
1671
1672 /* Wait for start of REQ/ACK handshake */
1673 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1674
1675 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1676 HOSTNO, cmd->device->id);
1677 tmp[0] = IDENTIFY(1, cmd->device->lun);
1678
1679#ifdef SUPPORT_TAGS
1680 if (cmd->tag != TAG_NONE) {
1681 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1682 tmp[2] = cmd->tag;
1683 len = 3;
1684 } else
1685 len = 1;
1686#else
1687 len = 1;
1688 cmd->tag=0;
1689#endif /* SUPPORT_TAGS */
1690
1691 /* Send message(s) */
1692 data = tmp;
1693 phase = PHASE_MSGOUT;
1694 NCR5380_transfer_pio(instance, &phase, &len, &data);
1695 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1696 /* XXX need to handle errors here */
1697 hostdata->connected = cmd;
1698#ifndef SUPPORT_TAGS
1699 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1700#endif
1701#ifdef SUN3_SCSI_VME
1702 dregs->csr |= CSR_INTR;
1703#endif
1704 initialize_SCp(cmd);
1705
1706
1707 return 0;
1708}
1709
1710/*
1711 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1712 * unsigned char *phase, int *count, unsigned char **data)
1713 *
1714 * Purpose : transfers data in given phase using polled I/O
1715 *
1716 * Inputs : instance - instance of driver, *phase - pointer to
1717 * what phase is expected, *count - pointer to number of
1718 * bytes to transfer, **data - pointer to data pointer.
1719 *
1720 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001721 * maximum number of bytes, 0 if all bytes are transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 * is in same phase.
1723 *
1724 * Also, *phase, *count, *data are modified in place.
1725 *
1726 * XXX Note : handling for bus free may be useful.
1727 */
1728
1729/*
1730 * Note : this code is not as quick as it could be, however it
1731 * IS 100% reliable, and for the actual data transfer where speed
1732 * counts, we will always do a pseudo DMA or DMA transfer.
1733 */
1734
1735static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1736 unsigned char *phase, int *count,
1737 unsigned char **data)
1738{
1739 register unsigned char p = *phase, tmp;
1740 register int c = *count;
1741 register unsigned char *d = *data;
1742
1743 /*
1744 * The NCR5380 chip will only drive the SCSI bus when the
1745 * phase specified in the appropriate bits of the TARGET COMMAND
1746 * REGISTER match the STATUS REGISTER
1747 */
1748
1749 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1750
1751 do {
1752 /*
1753 * Wait for assertion of REQ, after which the phase bits will be
1754 * valid
1755 */
1756 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1757
1758 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1759
1760 /* Check for phase mismatch */
1761 if ((tmp & PHASE_MASK) != p) {
1762 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1763 NCR_PRINT_PHASE(NDEBUG_PIO);
1764 break;
1765 }
1766
1767 /* Do actual transfer from SCSI bus to / from memory */
1768 if (!(p & SR_IO))
1769 NCR5380_write(OUTPUT_DATA_REG, *d);
1770 else
1771 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1772
1773 ++d;
1774
1775 /*
1776 * The SCSI standard suggests that in MSGOUT phase, the initiator
1777 * should drop ATN on the last byte of the message phase
1778 * after REQ has been asserted for the handshake but before
1779 * the initiator raises ACK.
1780 */
1781
1782 if (!(p & SR_IO)) {
1783 if (!((p & SR_MSG) && c > 1)) {
1784 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1785 ICR_ASSERT_DATA);
1786 NCR_PRINT(NDEBUG_PIO);
1787 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1788 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1789 } else {
1790 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1791 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1792 NCR_PRINT(NDEBUG_PIO);
1793 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1794 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1795 }
1796 } else {
1797 NCR_PRINT(NDEBUG_PIO);
1798 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1799 }
1800
1801 while (NCR5380_read(STATUS_REG) & SR_REQ);
1802
1803 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1804
1805/*
1806 * We have several special cases to consider during REQ/ACK handshaking :
1807 * 1. We were in MSGOUT phase, and we are on the last byte of the
1808 * message. ATN must be dropped as ACK is dropped.
1809 *
1810 * 2. We are in a MSGIN phase, and we are on the last byte of the
1811 * message. We must exit with ACK asserted, so that the calling
1812 * code may raise ATN before dropping ACK to reject the message.
1813 *
1814 * 3. ACK and ATN are clear and the target may proceed as normal.
1815 */
1816 if (!(p == PHASE_MSGIN && c == 1)) {
1817 if (p == PHASE_MSGOUT && c > 1)
1818 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1819 else
1820 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1821 }
1822 } while (--c);
1823
1824 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1825
1826 *count = c;
1827 *data = d;
1828 tmp = NCR5380_read(STATUS_REG);
1829 /* The phase read from the bus is valid if either REQ is (already)
1830 * asserted or if ACK hasn't been released yet. The latter is the case if
1831 * we're in MSGIN and all wanted bytes have been received. */
1832 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1833 *phase = tmp & PHASE_MASK;
1834 else
1835 *phase = PHASE_UNKNOWN;
1836
1837 if (!c || (*phase == p))
1838 return 0;
1839 else
1840 return -1;
1841}
1842
1843/*
1844 * Function : do_abort (Scsi_Host *host)
1845 *
1846 * Purpose : abort the currently established nexus. Should only be
1847 * called from a routine which can drop into a
1848 *
1849 * Returns : 0 on success, -1 on failure.
1850 */
1851
1852static int do_abort (struct Scsi_Host *host)
1853{
1854 unsigned char tmp, *msgptr, phase;
1855 int len;
1856
1857 /* Request message out phase */
1858 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1859
1860 /*
1861 * Wait for the target to indicate a valid phase by asserting
1862 * REQ. Once this happens, we'll have either a MSGOUT phase
1863 * and can immediately send the ABORT message, or we'll have some
1864 * other phase and will have to source/sink data.
1865 *
1866 * We really don't care what value was on the bus or what value
1867 * the target sees, so we just handshake.
1868 */
1869
Roel Kluin3be38e72007-11-15 21:13:46 +01001870 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871
1872 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1873
1874 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1875 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1876 ICR_ASSERT_ACK);
1877 while (NCR5380_read(STATUS_REG) & SR_REQ);
1878 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1879 }
1880
1881 tmp = ABORT;
1882 msgptr = &tmp;
1883 len = 1;
1884 phase = PHASE_MSGOUT;
1885 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1886
1887 /*
1888 * If we got here, and the command completed successfully,
1889 * we're about to go into bus free state.
1890 */
1891
1892 return len ? -1 : 0;
1893}
1894
1895#if defined(REAL_DMA)
1896/*
1897 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1898 * unsigned char *phase, int *count, unsigned char **data)
1899 *
1900 * Purpose : transfers data in given phase using either real
1901 * or pseudo DMA.
1902 *
1903 * Inputs : instance - instance of driver, *phase - pointer to
1904 * what phase is expected, *count - pointer to number of
1905 * bytes to transfer, **data - pointer to data pointer.
1906 *
1907 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001908 * maximum number of bytes, 0 if all bytes or transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 * is in same phase.
1910 *
1911 * Also, *phase, *count, *data are modified in place.
1912 *
1913 */
1914
1915
1916static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1917 unsigned char *phase, int *count,
1918 unsigned char **data)
1919{
1920 SETUP_HOSTDATA(instance);
1921 register int c = *count;
1922 register unsigned char p = *phase;
1923 unsigned long flags;
1924
1925 /* sanity check */
1926 if(!sun3_dma_setup_done) {
1927 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1928 BUG();
1929 }
1930 hostdata->dma_len = c;
1931
1932 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1933 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1934 c, (p & SR_IO) ? "to" : "from", *data);
1935
1936 /* netbsd turns off ints here, why not be safe and do it too */
1937 local_irq_save(flags);
1938
1939 /* send start chain */
1940 sun3scsi_dma_start(c, *data);
1941
1942 if (p & SR_IO) {
1943 NCR5380_write(TARGET_COMMAND_REG, 1);
1944 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1945 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1946 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1947 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1948 } else {
1949 NCR5380_write(TARGET_COMMAND_REG, 0);
1950 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1951 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1952 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1953 NCR5380_write(START_DMA_SEND_REG, 0);
1954 }
1955
1956#ifdef SUN3_SCSI_VME
1957 dregs->csr |= CSR_DMA_ENABLE;
1958#endif
1959
1960 local_irq_restore(flags);
1961
1962 sun3_dma_active = 1;
1963 return 0;
1964}
1965#endif /* defined(REAL_DMA) */
1966
1967/*
1968 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1969 *
1970 * Purpose : run through the various SCSI phases and do as the target
1971 * directs us to. Operates on the currently connected command,
1972 * instance->connected.
1973 *
1974 * Inputs : instance, instance for which we are doing commands
1975 *
1976 * Side effects : SCSI things happen, the disconnected queue will be
1977 * modified if a command disconnects, *instance->connected will
1978 * change.
1979 *
1980 * XXX Note : we need to watch for bus free or a reset condition here
1981 * to recover from an unexpected bus free condition.
1982 */
1983
1984static void NCR5380_information_transfer (struct Scsi_Host *instance)
1985{
1986 SETUP_HOSTDATA(instance);
1987 unsigned long flags;
1988 unsigned char msgout = NOP;
1989 int sink = 0;
1990 int len;
1991#if defined(REAL_DMA)
1992 int transfersize;
1993#endif
1994 unsigned char *data;
1995 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
Henne811c9362006-10-03 19:51:59 +02001996 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997
1998#ifdef SUN3_SCSI_VME
1999 dregs->csr |= CSR_INTR;
2000#endif
2001
2002 while (1) {
2003 tmp = NCR5380_read(STATUS_REG);
2004 /* We only have a valid SCSI phase when REQ is asserted */
2005 if (tmp & SR_REQ) {
2006 phase = (tmp & PHASE_MASK);
2007 if (phase != old_phase) {
2008 old_phase = phase;
2009 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2010 }
2011
2012 if(phase == PHASE_CMDOUT) {
2013 void *d;
2014 unsigned long count;
2015
2016 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2017 count = cmd->SCp.buffer->length;
2018 d = SGADDR(cmd->SCp.buffer);
2019 } else {
2020 count = cmd->SCp.this_residual;
2021 d = cmd->SCp.ptr;
2022 }
2023#ifdef REAL_DMA
2024 /* this command setup for dma yet? */
2025 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2026 != cmd))
2027 {
Christoph Hellwig33659eb2010-08-07 18:17:56 +02002028 if (cmd->request->cmd_type == REQ_TYPE_FS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029 sun3scsi_dma_setup(d, count,
2030 rq_data_dir(cmd->request));
2031 sun3_dma_setup_done = cmd;
2032 }
2033 }
2034#endif
2035#ifdef SUN3_SCSI_VME
2036 dregs->csr |= CSR_INTR;
2037#endif
2038 }
2039
2040
2041 if (sink && (phase != PHASE_MSGOUT)) {
2042 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2043
2044 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2045 ICR_ASSERT_ACK);
2046 while (NCR5380_read(STATUS_REG) & SR_REQ);
2047 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2048 ICR_ASSERT_ATN);
2049 sink = 0;
2050 continue;
2051 }
2052
2053 switch (phase) {
2054 case PHASE_DATAOUT:
2055#if (NDEBUG & NDEBUG_NO_DATAOUT)
2056 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2057 "aborted\n", HOSTNO);
2058 sink = 1;
2059 do_abort(instance);
2060 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002061 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 return;
2063#endif
2064 case PHASE_DATAIN:
2065 /*
2066 * If there is no room left in the current buffer in the
2067 * scatter-gather list, move onto the next one.
2068 */
2069 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2070 ++cmd->SCp.buffer;
2071 --cmd->SCp.buffers_residual;
2072 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2073 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2074
2075 /* ++roman: Try to merge some scatter-buffers if
2076 * they are at contiguous physical addresses.
2077 */
2078// merge_contiguous_buffers( cmd );
2079 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2080 HOSTNO, cmd->SCp.this_residual,
2081 cmd->SCp.buffers_residual);
2082 }
2083
2084 /*
2085 * The preferred transfer method is going to be
2086 * PSEUDO-DMA for systems that are strictly PIO,
2087 * since we can let the hardware do the handshaking.
2088 *
2089 * For this to work, we need to know the transfersize
2090 * ahead of time, since the pseudo-DMA code will sit
2091 * in an unconditional loop.
2092 */
2093
2094/* ++roman: I suggest, this should be
2095 * #if def(REAL_DMA)
2096 * instead of leaving REAL_DMA out.
2097 */
2098
2099#if defined(REAL_DMA)
2100// if (!cmd->device->borken &&
2101 if((transfersize =
2102 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2103 len = transfersize;
2104 cmd->SCp.phase = phase;
2105
2106 if (NCR5380_transfer_dma(instance, &phase,
2107 &len, (unsigned char **) &cmd->SCp.ptr)) {
2108 /*
2109 * If the watchdog timer fires, all future
2110 * accesses to this device will use the
2111 * polled-IO. */
2112 printk(KERN_NOTICE "scsi%d: switching target %d "
2113 "lun %d to slow handshake\n", HOSTNO,
2114 cmd->device->id, cmd->device->lun);
2115 cmd->device->borken = 1;
2116 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2117 ICR_ASSERT_ATN);
2118 sink = 1;
2119 do_abort(instance);
2120 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002121 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 /* XXX - need to source or sink data here, as appropriate */
2123 } else {
2124#ifdef REAL_DMA
2125 /* ++roman: When using real DMA,
2126 * information_transfer() should return after
2127 * starting DMA since it has nothing more to
2128 * do.
2129 */
2130 return;
2131#else
2132 cmd->SCp.this_residual -= transfersize - len;
2133#endif
2134 }
2135 } else
2136#endif /* defined(REAL_DMA) */
2137 NCR5380_transfer_pio(instance, &phase,
2138 (int *) &cmd->SCp.this_residual, (unsigned char **)
2139 &cmd->SCp.ptr);
2140#ifdef REAL_DMA
2141 /* if we had intended to dma that command clear it */
2142 if(sun3_dma_setup_done == cmd)
2143 sun3_dma_setup_done = NULL;
2144#endif
2145
2146 break;
2147 case PHASE_MSGIN:
2148 len = 1;
2149 data = &tmp;
2150 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2151 NCR5380_transfer_pio(instance, &phase, &len, &data);
2152 cmd->SCp.Message = tmp;
2153
2154 switch (tmp) {
2155 /*
2156 * Linking lets us reduce the time required to get the
2157 * next command out to the device, hopefully this will
2158 * mean we don't waste another revolution due to the delays
2159 * required by ARBITRATION and another SELECTION.
2160 *
2161 * In the current implementation proposal, low level drivers
2162 * merely have to start the next command, pointed to by
2163 * next_link, done() is called as with unlinked commands.
2164 */
2165#ifdef LINKED
2166 case LINKED_CMD_COMPLETE:
2167 case LINKED_FLG_CMD_COMPLETE:
2168 /* Accept message by clearing ACK */
2169 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2170
2171 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2172 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2173
2174 /* Enable reselect interrupts */
2175 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2176 /*
2177 * Sanity check : A linked command should only terminate
2178 * with one of these messages if there are more linked
2179 * commands available.
2180 */
2181
2182 if (!cmd->next_link) {
2183 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2184 "linked command complete, no next_link\n",
2185 HOSTNO, cmd->device->id, cmd->device->lun);
2186 sink = 1;
2187 do_abort (instance);
2188 return;
2189 }
2190
2191 initialize_SCp(cmd->next_link);
2192 /* The next command is still part of this process; copy it
2193 * and don't free it! */
2194 cmd->next_link->tag = cmd->tag;
2195 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2196 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2197 "done, calling scsi_done().\n",
2198 HOSTNO, cmd->device->id, cmd->device->lun);
2199#ifdef NCR5380_STATS
2200 collect_stats(hostdata, cmd);
2201#endif
2202 cmd->scsi_done(cmd);
2203 cmd = hostdata->connected;
2204 break;
2205#endif /* def LINKED */
2206 case ABORT:
2207 case COMMAND_COMPLETE:
2208 /* Accept message by clearing ACK */
2209 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2210 hostdata->connected = NULL;
2211 QU_PRINTK("scsi%d: command for target %d, lun %d "
2212 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2213#ifdef SUPPORT_TAGS
2214 cmd_free_tag( cmd );
2215 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2216 /* Turn a QUEUE FULL status into BUSY, I think the
2217 * mid level cannot handle QUEUE FULL :-( (The
2218 * command is retried after BUSY). Also update our
2219 * queue size to the number of currently issued
2220 * commands now.
2221 */
2222 /* ++Andreas: the mid level code knows about
2223 QUEUE_FULL now. */
2224 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2225 TAG_PRINTK("scsi%d: target %d lun %d returned "
2226 "QUEUE_FULL after %d commands\n",
2227 HOSTNO, cmd->device->id, cmd->device->lun,
2228 ta->nr_allocated);
2229 if (ta->queue_size > ta->nr_allocated)
2230 ta->nr_allocated = ta->queue_size;
2231 }
2232#else
2233 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2234#endif
2235 /* Enable reselect interrupts */
2236 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2237
2238 /*
2239 * I'm not sure what the correct thing to do here is :
2240 *
2241 * If the command that just executed is NOT a request
2242 * sense, the obvious thing to do is to set the result
2243 * code to the values of the stored parameters.
2244 *
2245 * If it was a REQUEST SENSE command, we need some way to
2246 * differentiate between the failure code of the original
2247 * and the failure code of the REQUEST sense - the obvious
2248 * case is success, where we fall through and leave the
2249 * result code unchanged.
2250 *
2251 * The non-obvious place is where the REQUEST SENSE failed
2252 */
2253
2254 if (cmd->cmnd[0] != REQUEST_SENSE)
2255 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2256 else if (status_byte(cmd->SCp.Status) != GOOD)
2257 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2258
2259#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002260 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2261 hostdata->ses.cmd_len) {
2262 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2263 hostdata->ses.cmd_len = 0 ;
2264 }
2265
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2267 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
Boaz Harrosh28424d32007-09-10 22:37:45 +03002268 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 ASEN_PRINTK("scsi%d: performing request sense\n",
2270 HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 /* this is initialized from initialize_SCp
2272 cmd->SCp.buffer = NULL;
2273 cmd->SCp.buffers_residual = 0;
2274 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275
2276 local_irq_save(flags);
2277 LIST(cmd,hostdata->issue_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002278 SET_NEXT(cmd, hostdata->issue_queue);
Henne811c9362006-10-03 19:51:59 +02002279 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 local_irq_restore(flags);
2281 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2282 "issue queue\n", H_NO(cmd));
2283 } else
2284#endif /* def AUTOSENSE */
2285 {
2286#ifdef NCR5380_STATS
2287 collect_stats(hostdata, cmd);
2288#endif
2289 cmd->scsi_done(cmd);
2290 }
2291
2292 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2293 /*
2294 * Restore phase bits to 0 so an interrupted selection,
2295 * arbitration can resume.
2296 */
2297 NCR5380_write(TARGET_COMMAND_REG, 0);
2298
2299 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2300 barrier();
2301
2302 return;
2303 case MESSAGE_REJECT:
2304 /* Accept message by clearing ACK */
2305 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2306 /* Enable reselect interrupts */
2307 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2308 switch (hostdata->last_message) {
2309 case HEAD_OF_QUEUE_TAG:
2310 case ORDERED_QUEUE_TAG:
2311 case SIMPLE_QUEUE_TAG:
2312 /* The target obviously doesn't support tagged
2313 * queuing, even though it announced this ability in
2314 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2315 * clear 'tagged_supported' and lock the LUN, since
2316 * the command is treated as untagged further on.
2317 */
2318 cmd->device->tagged_supported = 0;
2319 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2320 cmd->tag = TAG_NONE;
2321 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2322 "QUEUE_TAG message; tagged queuing "
2323 "disabled\n",
2324 HOSTNO, cmd->device->id, cmd->device->lun);
2325 break;
2326 }
2327 break;
2328 case DISCONNECT:
2329 /* Accept message by clearing ACK */
2330 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2331 local_irq_save(flags);
2332 cmd->device->disconnect = 1;
2333 LIST(cmd,hostdata->disconnected_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002334 SET_NEXT(cmd, hostdata->disconnected_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335 hostdata->connected = NULL;
2336 hostdata->disconnected_queue = cmd;
2337 local_irq_restore(flags);
2338 QU_PRINTK("scsi%d: command for target %d lun %d was "
2339 "moved from connected to the "
2340 "disconnected_queue\n", HOSTNO,
2341 cmd->device->id, cmd->device->lun);
2342 /*
2343 * Restore phase bits to 0 so an interrupted selection,
2344 * arbitration can resume.
2345 */
2346 NCR5380_write(TARGET_COMMAND_REG, 0);
2347
2348 /* Enable reselect interrupts */
2349 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2350 /* Wait for bus free to avoid nasty timeouts */
2351 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2352 barrier();
2353#ifdef SUN3_SCSI_VME
2354 dregs->csr |= CSR_DMA_ENABLE;
2355#endif
2356 return;
2357 /*
2358 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2359 * operation, in violation of the SCSI spec so we can safely
2360 * ignore SAVE/RESTORE pointers calls.
2361 *
2362 * Unfortunately, some disks violate the SCSI spec and
2363 * don't issue the required SAVE_POINTERS message before
2364 * disconnecting, and we have to break spec to remain
2365 * compatible.
2366 */
2367 case SAVE_POINTERS:
2368 case RESTORE_POINTERS:
2369 /* Accept message by clearing ACK */
2370 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2371 /* Enable reselect interrupts */
2372 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2373 break;
2374 case EXTENDED_MESSAGE:
2375/*
2376 * Extended messages are sent in the following format :
2377 * Byte
2378 * 0 EXTENDED_MESSAGE == 1
2379 * 1 length (includes one byte for code, doesn't
2380 * include first two bytes)
2381 * 2 code
2382 * 3..length+1 arguments
2383 *
2384 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002385 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386 */
2387 extended_msg[0] = EXTENDED_MESSAGE;
2388 /* Accept first byte by clearing ACK */
2389 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2390
2391 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2392
2393 len = 2;
2394 data = extended_msg + 1;
2395 phase = PHASE_MSGIN;
2396 NCR5380_transfer_pio(instance, &phase, &len, &data);
2397 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2398 (int)extended_msg[1], (int)extended_msg[2]);
2399
2400 if (!len && extended_msg[1] <=
2401 (sizeof (extended_msg) - 1)) {
2402 /* Accept third byte by clearing ACK */
2403 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2404 len = extended_msg[1] - 1;
2405 data = extended_msg + 3;
2406 phase = PHASE_MSGIN;
2407
2408 NCR5380_transfer_pio(instance, &phase, &len, &data);
2409 EXT_PRINTK("scsi%d: message received, residual %d\n",
2410 HOSTNO, len);
2411
2412 switch (extended_msg[2]) {
2413 case EXTENDED_SDTR:
2414 case EXTENDED_WDTR:
2415 case EXTENDED_MODIFY_DATA_POINTER:
2416 case EXTENDED_EXTENDED_IDENTIFY:
2417 tmp = 0;
2418 }
2419 } else if (len) {
2420 printk(KERN_NOTICE "scsi%d: error receiving "
2421 "extended message\n", HOSTNO);
2422 tmp = 0;
2423 } else {
2424 printk(KERN_NOTICE "scsi%d: extended message "
2425 "code %02x length %d is too long\n",
2426 HOSTNO, extended_msg[2], extended_msg[1]);
2427 tmp = 0;
2428 }
2429 /* Fall through to reject message */
2430
2431 /*
2432 * If we get something weird that we aren't expecting,
2433 * reject it.
2434 */
2435 default:
2436 if (!tmp) {
2437 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002438 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002439 printk("\n");
2440 } else if (tmp != EXTENDED_MESSAGE)
2441 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2442 "message %02x from target %d, lun %d\n",
2443 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2444 else
2445 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2446 "extended message "
2447 "code %02x, length %d from target %d, lun %d\n",
2448 HOSTNO, extended_msg[1], extended_msg[0],
2449 cmd->device->id, cmd->device->lun);
2450
2451
2452 msgout = MESSAGE_REJECT;
2453 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2454 ICR_ASSERT_ATN);
2455 break;
2456 } /* switch (tmp) */
2457 break;
2458 case PHASE_MSGOUT:
2459 len = 1;
2460 data = &msgout;
2461 hostdata->last_message = msgout;
2462 NCR5380_transfer_pio(instance, &phase, &len, &data);
2463 if (msgout == ABORT) {
2464#ifdef SUPPORT_TAGS
2465 cmd_free_tag( cmd );
2466#else
2467 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2468#endif
2469 hostdata->connected = NULL;
2470 cmd->result = DID_ERROR << 16;
2471#ifdef NCR5380_STATS
2472 collect_stats(hostdata, cmd);
2473#endif
2474 cmd->scsi_done(cmd);
2475 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2476 return;
2477 }
2478 msgout = NOP;
2479 break;
2480 case PHASE_CMDOUT:
2481 len = cmd->cmd_len;
2482 data = cmd->cmnd;
2483 /*
2484 * XXX for performance reasons, on machines with a
2485 * PSEUDO-DMA architecture we should probably
2486 * use the dma transfer function.
2487 */
2488 NCR5380_transfer_pio(instance, &phase, &len,
2489 &data);
2490 break;
2491 case PHASE_STATIN:
2492 len = 1;
2493 data = &tmp;
2494 NCR5380_transfer_pio(instance, &phase, &len, &data);
2495 cmd->SCp.Status = tmp;
2496 break;
2497 default:
2498 printk("scsi%d: unknown phase\n", HOSTNO);
2499 NCR_PRINT(NDEBUG_ANY);
2500 } /* switch(phase) */
2501 } /* if (tmp * SR_REQ) */
2502 } /* while (1) */
2503}
2504
2505/*
2506 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2507 *
2508 * Purpose : does reselection, initializing the instance->connected
Henne811c9362006-10-03 19:51:59 +02002509 * 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 -07002510 * nexus has been reestablished,
2511 *
2512 * Inputs : instance - this instance of the NCR5380.
2513 *
2514 */
2515
2516/* it might eventually prove necessary to do a dma setup on
2517 reselection, but it doesn't seem to be needed now -- sam */
2518
2519static void NCR5380_reselect (struct Scsi_Host *instance)
2520{
2521 SETUP_HOSTDATA(instance);
2522 unsigned char target_mask;
2523 unsigned char lun;
2524#ifdef SUPPORT_TAGS
2525 unsigned char tag;
2526#endif
2527 unsigned char msg[3];
Henne811c9362006-10-03 19:51:59 +02002528 struct scsi_cmnd *tmp = NULL, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529/* unsigned long flags; */
2530
2531 /*
2532 * Disable arbitration, etc. since the host adapter obviously
2533 * lost, and tell an interrupted NCR5380_select() to restart.
2534 */
2535
2536 NCR5380_write(MODE_REG, MR_BASE);
2537 hostdata->restart_select = 1;
2538
2539 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2540
2541 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2542
2543 /*
2544 * At this point, we have detected that our SCSI ID is on the bus,
2545 * SEL is true and BSY was false for at least one bus settle delay
2546 * (400 ns).
2547 *
2548 * We must assert BSY ourselves, until the target drops the SEL
2549 * signal.
2550 */
2551
2552 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2553
2554 while (NCR5380_read(STATUS_REG) & SR_SEL);
2555 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2556
2557 /*
2558 * Wait for target to go into MSGIN.
2559 */
2560
2561 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2562
2563#if 1
2564 // acknowledge toggle to MSGIN
2565 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2566
2567 // peek at the byte without really hitting the bus
2568 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2569#endif
2570
2571 if (!(msg[0] & 0x80)) {
2572 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002573 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002574 do_abort(instance);
2575 return;
2576 }
2577 lun = (msg[0] & 0x07);
2578
2579 /*
2580 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2581 * just reestablished, and remove it from the disconnected queue.
2582 */
2583
Henne811c9362006-10-03 19:51:59 +02002584 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2586 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2587#ifdef SUPPORT_TAGS
2588 && (tag == tmp->tag)
2589#endif
2590 ) {
2591 if (prev) {
2592 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002593 SET_NEXT(prev, NEXT(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 } else {
2595 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2596 hostdata->disconnected_queue = NEXT(tmp);
2597 }
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002598 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599 break;
2600 }
2601 }
2602
2603 if (!tmp) {
2604 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2605#ifdef SUPPORT_TAGS
2606 "tag %d "
2607#endif
2608 "not in disconnected_queue.\n",
2609 HOSTNO, target_mask, lun
2610#ifdef SUPPORT_TAGS
2611 , tag
2612#endif
2613 );
2614 /*
2615 * Since we have an established nexus that we can't do anything
2616 * with, we must abort it.
2617 */
2618 do_abort(instance);
2619 return;
2620 }
2621#if 1
2622 /* engage dma setup for the command we just saw */
2623 {
2624 void *d;
2625 unsigned long count;
2626
2627 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2628 count = tmp->SCp.buffer->length;
2629 d = SGADDR(tmp->SCp.buffer);
2630 } else {
2631 count = tmp->SCp.this_residual;
2632 d = tmp->SCp.ptr;
2633 }
2634#ifdef REAL_DMA
2635 /* setup this command for dma if not already */
2636 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2637 {
2638 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2639 sun3_dma_setup_done = tmp;
2640 }
2641#endif
2642 }
2643#endif
2644
2645 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2646 /* Accept message by clearing ACK */
2647 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2648
2649#ifdef SUPPORT_TAGS
2650 /* If the phase is still MSGIN, the target wants to send some more
2651 * messages. In case it supports tagged queuing, this is probably a
2652 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2653 */
2654 tag = TAG_NONE;
2655 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2656 /* Accept previous IDENTIFY message by clearing ACK */
2657 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2658 len = 2;
2659 data = msg+1;
2660 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2661 msg[1] == SIMPLE_QUEUE_TAG)
2662 tag = msg[2];
2663 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2664 "reselection\n", HOSTNO, target_mask, lun, tag);
2665 }
2666#endif
2667
2668 hostdata->connected = tmp;
2669 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2670 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2671}
2672
2673
2674/*
Henne811c9362006-10-03 19:51:59 +02002675 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676 *
2677 * Purpose : abort a command
2678 *
Henne811c9362006-10-03 19:51:59 +02002679 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680 * host byte of the result field to, if zero DID_ABORTED is
2681 * used.
2682 *
2683 * Returns : 0 - success, -1 on failure.
2684 *
2685 * XXX - there is no way to abort the command that is currently
2686 * connected, you have to wait for it to complete. If this is
2687 * a problem, we could implement longjmp() / setjmp(), setjmp()
2688 * called where the loop started in NCR5380_main().
2689 */
2690
Henne811c9362006-10-03 19:51:59 +02002691static int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692{
2693 struct Scsi_Host *instance = cmd->device->host;
2694 SETUP_HOSTDATA(instance);
Henne811c9362006-10-03 19:51:59 +02002695 struct scsi_cmnd *tmp, **prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696 unsigned long flags;
2697
2698 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
db9dff32005-04-03 14:53:59 -05002699 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700
2701 NCR5380_print_status (instance);
2702
2703 local_irq_save(flags);
2704
2705 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2706 NCR5380_read(BUS_AND_STATUS_REG),
2707 NCR5380_read(STATUS_REG));
2708
2709#if 1
2710/*
2711 * Case 1 : If the command is the currently executing command,
2712 * we'll set the aborted flag and return control so that
2713 * information transfer routine can exit cleanly.
2714 */
2715
2716 if (hostdata->connected == cmd) {
2717
2718 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2719/*
2720 * We should perform BSY checking, and make sure we haven't slipped
2721 * into BUS FREE.
2722 */
2723
2724/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2725/*
2726 * Since we can't change phases until we've completed the current
2727 * handshake, we have to source or sink a byte of data if the current
2728 * phase is not MSGOUT.
2729 */
2730
2731/*
2732 * Return control to the executing NCR drive so we can clear the
2733 * aborted flag and get back into our main loop.
2734 */
2735
2736 if (do_abort(instance) == 0) {
2737 hostdata->aborted = 1;
2738 hostdata->connected = NULL;
2739 cmd->result = DID_ABORT << 16;
2740#ifdef SUPPORT_TAGS
2741 cmd_free_tag( cmd );
2742#else
2743 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2744#endif
2745 local_irq_restore(flags);
2746 cmd->scsi_done(cmd);
2747 return SCSI_ABORT_SUCCESS;
2748 } else {
2749/* local_irq_restore(flags); */
2750 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2751 return SCSI_ABORT_ERROR;
2752 }
2753 }
2754#endif
2755
2756/*
2757 * Case 2 : If the command hasn't been issued yet, we simply remove it
2758 * from the issue queue.
2759 */
Henne811c9362006-10-03 19:51:59 +02002760 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2761 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2762 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002763 if (cmd == tmp) {
2764 REMOVE(5, *prev, tmp, NEXT(tmp));
2765 (*prev) = NEXT(tmp);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002766 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002767 tmp->result = DID_ABORT << 16;
2768 local_irq_restore(flags);
2769 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2770 HOSTNO);
2771 /* Tagged queuing note: no tag to free here, hasn't been assigned
2772 * yet... */
2773 tmp->scsi_done(tmp);
2774 return SCSI_ABORT_SUCCESS;
2775 }
2776
2777/*
2778 * Case 3 : If any commands are connected, we're going to fail the abort
2779 * and let the high level SCSI driver retry at a later time or
2780 * issue a reset.
2781 *
2782 * Timeouts, and therefore aborted commands, will be highly unlikely
2783 * and handling them cleanly in this situation would make the common
2784 * case of noresets less efficient, and would pollute our code. So,
2785 * we fail.
2786 */
2787
2788 if (hostdata->connected) {
2789 local_irq_restore(flags);
2790 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2791 return SCSI_ABORT_SNOOZE;
2792 }
2793
2794/*
2795 * Case 4: If the command is currently disconnected from the bus, and
2796 * there are no connected commands, we reconnect the I_T_L or
2797 * I_T_L_Q nexus associated with it, go into message out, and send
2798 * an abort message.
2799 *
2800 * This case is especially ugly. In order to reestablish the nexus, we
2801 * need to call NCR5380_select(). The easiest way to implement this
2802 * function was to abort if the bus was busy, and let the interrupt
2803 * handler triggered on the SEL for reselect take care of lost arbitrations
2804 * where necessary, meaning interrupts need to be enabled.
2805 *
2806 * When interrupts are enabled, the queues may change - so we
2807 * can't remove it from the disconnected queue before selecting it
2808 * because that could cause a failure in hashing the nexus if that
2809 * device reselected.
2810 *
2811 * Since the queues may change, we can't use the pointers from when we
2812 * first locate it.
2813 *
2814 * So, we must first locate the command, and if NCR5380_select()
2815 * succeeds, then issue the abort, relocate the command and remove
2816 * it from the disconnected queue.
2817 */
2818
Henne811c9362006-10-03 19:51:59 +02002819 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002820 tmp = NEXT(tmp))
2821 if (cmd == tmp) {
2822 local_irq_restore(flags);
2823 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2824
2825 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2826 return SCSI_ABORT_BUSY;
2827
2828 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2829
2830 do_abort (instance);
2831
2832 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002833 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2834 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2836 if (cmd == tmp) {
2837 REMOVE(5, *prev, tmp, NEXT(tmp));
2838 *prev = NEXT(tmp);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002839 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840 tmp->result = DID_ABORT << 16;
2841 /* We must unlock the tag/LUN immediately here, since the
2842 * target goes to BUS FREE and doesn't send us another
2843 * message (COMMAND_COMPLETE or the like)
2844 */
2845#ifdef SUPPORT_TAGS
2846 cmd_free_tag( tmp );
2847#else
2848 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2849#endif
2850 local_irq_restore(flags);
2851 tmp->scsi_done(tmp);
2852 return SCSI_ABORT_SUCCESS;
2853 }
2854 }
2855
2856/*
2857 * Case 5 : If we reached this point, the command was not found in any of
2858 * the queues.
2859 *
2860 * We probably reached this point because of an unlikely race condition
2861 * between the command completing successfully and the abortion code,
2862 * so we won't panic, but we will notify the user in case something really
2863 * broke.
2864 */
2865
2866 local_irq_restore(flags);
Joe Perchesad361c92009-07-06 13:05:40 -07002867 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868
2869 return SCSI_ABORT_NOT_RUNNING;
2870}
2871
2872
2873/*
Henne811c9362006-10-03 19:51:59 +02002874 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875 *
2876 * Purpose : reset the SCSI bus.
2877 *
2878 * Returns : SCSI_RESET_WAKEUP
2879 *
2880 */
2881
Henne811c9362006-10-03 19:51:59 +02002882static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002883{
2884 SETUP_HOSTDATA(cmd->device->host);
2885 int i;
2886 unsigned long flags;
2887#if 1
Henne811c9362006-10-03 19:51:59 +02002888 struct scsi_cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002889#endif
2890
2891
2892 NCR5380_print_status (cmd->device->host);
2893
2894 /* get in phase */
2895 NCR5380_write( TARGET_COMMAND_REG,
2896 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2897 /* assert RST */
2898 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2899 udelay (40);
2900 /* reset NCR registers */
2901 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2902 NCR5380_write( MODE_REG, MR_BASE );
2903 NCR5380_write( TARGET_COMMAND_REG, 0 );
2904 NCR5380_write( SELECT_ENABLE_REG, 0 );
2905 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2906 * through anymore ... */
2907 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2908
2909#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2910 /* XXX see below XXX */
2911
2912 /* MSch: old-style reset: actually abort all command processing here */
2913
2914 /* After the reset, there are no more connected or disconnected commands
2915 * and no busy units; to avoid problems with re-inserting the commands
2916 * into the issue_queue (via scsi_done()), the aborted commands are
2917 * remembered in local variables first.
2918 */
2919 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002920 connected = (struct scsi_cmnd *)hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 hostdata->connected = NULL;
Henne811c9362006-10-03 19:51:59 +02002922 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 hostdata->disconnected_queue = NULL;
2924#ifdef SUPPORT_TAGS
2925 free_all_tags();
2926#endif
2927 for( i = 0; i < 8; ++i )
2928 hostdata->busy[i] = 0;
2929#ifdef REAL_DMA
2930 hostdata->dma_len = 0;
2931#endif
2932 local_irq_restore(flags);
2933
2934 /* In order to tell the mid-level code which commands were aborted,
2935 * set the command status to DID_RESET and call scsi_done() !!!
2936 * This ultimately aborts processing of these commands in the mid-level.
2937 */
2938
2939 if ((cmd = connected)) {
2940 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2941 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2942 cmd->scsi_done( cmd );
2943 }
2944
2945 for (i = 0; (cmd = disconnected_queue); ++i) {
2946 disconnected_queue = NEXT(cmd);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002947 SET_NEXT(cmd, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002948 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2949 cmd->scsi_done( cmd );
2950 }
2951 if (i > 0)
2952 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2953
2954
2955 /* since all commands have been explicitly terminated, we need to tell
2956 * the midlevel code that the reset was SUCCESSFUL, and there is no
2957 * need to 'wake up' the commands by a request_sense
2958 */
2959 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2960#else /* 1 */
2961
2962 /* MSch: new-style reset handling: let the mid-level do what it can */
2963
2964 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2965 * Mid-level is supposed to requeue all commands that were active on the
2966 * various low-level queues. In fact it does this, but that's not enough
2967 * because all these commands are subject to timeout. And if a timeout
2968 * happens for any removed command, *_abort() is called but all queues
2969 * are now empty. Abort then gives up the falcon lock, which is fatal,
2970 * since the mid-level will queue more commands and must have the lock
2971 * (it's all happening inside timer interrupt handler!!).
2972 * Even worse, abort will return NOT_RUNNING for all those commands not
2973 * on any queue, so they won't be retried ...
2974 *
2975 * Conclusion: either scsi.c disables timeout for all resetted commands
2976 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2977 */
2978
2979 /* After the reset, there are no more connected or disconnected commands
2980 * and no busy units; so clear the low-level status here to avoid
2981 * conflicts when the mid-level code tries to wake up the affected
2982 * commands!
2983 */
2984
2985 if (hostdata->issue_queue)
2986 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2987 if (hostdata->connected)
2988 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2989 if (hostdata->disconnected_queue)
2990 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2991
2992 local_irq_save(flags);
2993 hostdata->issue_queue = NULL;
2994 hostdata->connected = NULL;
2995 hostdata->disconnected_queue = NULL;
2996#ifdef SUPPORT_TAGS
2997 free_all_tags();
2998#endif
2999 for( i = 0; i < 8; ++i )
3000 hostdata->busy[i] = 0;
3001#ifdef REAL_DMA
3002 hostdata->dma_len = 0;
3003#endif
3004 local_irq_restore(flags);
3005
3006 /* we did no complete reset of all commands, so a wakeup is required */
3007 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3008#endif /* 1 */
3009}
3010
3011/* Local Variables: */
3012/* tab-width: 8 */
3013/* End: */