blob: 636bbe0ea84cad96705dce323e7a03a0c8859f36 [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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
53 * and USLEEP, because these were messing up readability and will never be
54 * needed for Atari SCSI.
55 *
56 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
57 * stuff), and 'main' is executed in a bottom half if awoken by an
58 * interrupt.
59 *
60 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
61 * constructs. In my eyes, this made the source rather unreadable, so I
62 * finally replaced that by the *_PRINTK() macros.
63 *
64 */
db9dff32005-04-03 14:53:59 -050065#include <scsi/scsi_dbg.h>
Matthew Wilcox1abfd372005-12-15 16:22:01 -050066#include <scsi/scsi_transport_spi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68/*
69 * Further development / testing that should be done :
70 * 1. Test linked command handling code after Eric is ready with
71 * the high level code.
72 */
73
74#if (NDEBUG & NDEBUG_LISTS)
75#define LIST(x,y) \
76 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
77 if ((x)==(y)) udelay(5); }
78#define REMOVE(w,x,y,z) \
79 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
80 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
81 if ((x)==(y)) udelay(5); }
82#else
83#define LIST(x,y)
84#define REMOVE(w,x,y,z)
85#endif
86
87#ifndef notyet
88#undef LINKED
89#endif
90
91/*
92 * Design
93 * Issues :
94 *
95 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
96 * and specifically for each board rather than each chip. This makes their
97 * adaptation to platforms like the Mac (Some of which use NCR5380's)
98 * more difficult than it has to be.
99 *
100 * Also, many of the SCSI drivers were written before the command queuing
101 * routines were implemented, meaning their implementations of queued
102 * commands were hacked on rather than designed in from the start.
103 *
104 * When I designed the Linux SCSI drivers I figured that
105 * while having two different SCSI boards in a system might be useful
106 * for debugging things, two of the same type wouldn't be used.
107 * Well, I was wrong and a number of users have mailed me about running
108 * multiple high-performance SCSI boards in a server.
109 *
110 * Finally, when I get questions from users, I have no idea what
111 * revision of my driver they are running.
112 *
113 * This driver attempts to address these problems :
114 * This is a generic 5380 driver. To use it on a different platform,
115 * one simply writes appropriate system specific macros (ie, data
116 * transfer - some PC's will use the I/O bus, 68K's must use
117 * memory mapped) and drops this file in their 'C' wrapper.
118 *
119 * As far as command queueing, two queues are maintained for
120 * each 5380 in the system - commands that haven't been issued yet,
121 * and commands that are currently executing. This means that an
122 * unlimited number of commands may be queued, letting
123 * more commands propagate from the higher driver levels giving higher
124 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
125 * allowing multiple commands to propagate all the way to a SCSI-II device
126 * while a command is already executing.
127 *
128 * To solve the multiple-boards-in-the-same-system problem,
129 * there is a separate instance structure for each instance
130 * of a 5380 in the system. So, multiple NCR5380 drivers will
131 * be able to coexist with appropriate changes to the high level
132 * SCSI code.
133 *
134 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
135 * number (updated for each public release) printed by the
136 * NCR5380_print_options command, which should be called from the
137 * wrapper detect function, so that I know what release of the driver
138 * users are using.
139 *
140 * Issues specific to the NCR5380 :
141 *
142 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
143 * piece of hardware that requires you to sit in a loop polling for
144 * the REQ signal as long as you are connected. Some devices are
145 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
146 * while doing long seek operations.
147 *
148 * The workaround for this is to keep track of devices that have
149 * disconnected. If the device hasn't disconnected, for commands that
150 * should disconnect, we do something like
151 *
152 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
153 *
154 * Some tweaking of N and M needs to be done. An algorithm based
155 * on "time to data" would give the best results as long as short time
156 * to datas (ie, on the same track) were considered, however these
157 * broken devices are the exception rather than the rule and I'd rather
158 * spend my time optimizing for the normal case.
159 *
160 * Architecture :
161 *
162 * At the heart of the design is a coroutine, NCR5380_main,
163 * which is started when not running by the interrupt handler,
164 * timer, and queue command function. It attempts to establish
165 * I_T_L or I_T_L_Q nexuses by removing the commands from the
166 * issue queue and calling NCR5380_select() if a nexus
167 * is not established.
168 *
169 * Once a nexus is established, the NCR5380_information_transfer()
170 * phase goes through the various phases as instructed by the target.
171 * if the target goes into MSG IN and sends a DISCONNECT message,
172 * the command structure is placed into the per instance disconnected
173 * queue, and NCR5380_main tries to find more work. If USLEEP
174 * was defined, and the target is idle for too long, the system
175 * will try to sleep.
176 *
177 * If a command has disconnected, eventually an interrupt will trigger,
178 * calling NCR5380_intr() which will in turn call NCR5380_reselect
179 * to reestablish a nexus. This will run main if necessary.
180 *
181 * On command termination, the done function will be called as
182 * appropriate.
183 *
184 * SCSI pointers are maintained in the SCp field of SCSI command
185 * structures, being initialized after the command is connected
186 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
187 * Note that in violation of the standard, an implicit SAVE POINTERS operation
188 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
189 */
190
191/*
192 * Using this file :
193 * This file a skeleton Linux SCSI driver for the NCR 5380 series
194 * of chips. To use it, you write an architecture specific functions
195 * and macros and include this file in your driver.
196 *
197 * These macros control options :
198 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
199 * for commands that return with a CHECK CONDITION status.
200 *
201 * LINKED - if defined, linked commands are supported.
202 *
203 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
204 *
205 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
206 *
207 * These macros MUST be defined :
208 *
209 * NCR5380_read(register) - read from the specified register
210 *
211 * NCR5380_write(register, value) - write to the specific register
212 *
213 * Either real DMA *or* pseudo DMA may be implemented
214 * REAL functions :
215 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
216 * Note that the DMA setup functions should return the number of bytes
217 * that they were able to program the controller for.
218 *
219 * Also note that generic i386/PC versions of these macros are
220 * available as NCR5380_i386_dma_write_setup,
221 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
222 *
223 * NCR5380_dma_write_setup(instance, src, count) - initialize
224 * NCR5380_dma_read_setup(instance, dst, count) - initialize
225 * NCR5380_dma_residual(instance); - residual count
226 *
227 * PSEUDO functions :
228 * NCR5380_pwrite(instance, src, count)
229 * NCR5380_pread(instance, dst, count);
230 *
231 * If nothing specific to this implementation needs doing (ie, with external
232 * hardware), you must also define
233 *
234 * NCR5380_queue_command
235 * NCR5380_reset
236 * NCR5380_abort
237 * NCR5380_proc_info
238 *
239 * to be the global entry points into the specific driver, ie
240 * #define NCR5380_queue_command t128_queue_command.
241 *
242 * If this is not done, the routines will be defined as static functions
243 * with the NCR5380* names and the user must provide a globally
244 * accessible wrapper function.
245 *
246 * The generic driver is initialized by calling NCR5380_init(instance),
247 * after setting the appropriate host specific fields and ID. If the
248 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
249 * possible) function may be used. Before the specific driver initialization
250 * code finishes, NCR5380_print_options should be called.
251 */
252
253static struct Scsi_Host *first_instance = NULL;
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100254static struct scsi_host_template *the_template = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256/* Macros ease life... :-) */
257#define SETUP_HOSTDATA(in) \
258 struct NCR5380_hostdata *hostdata = \
259 (struct NCR5380_hostdata *)(in)->hostdata
260#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
261
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200262#define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble)
263#define SET_NEXT(cmd, next) ((cmd)->host_scribble = (void *)(next))
264#define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266#define HOSTNO instance->host_no
267#define H_NO(cmd) (cmd)->device->host->host_no
268
Jens Axboe45711f12007-10-22 21:19:53 +0200269#define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271#ifdef SUPPORT_TAGS
272
273/*
274 * Functions for handling tagged queuing
275 * =====================================
276 *
277 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
278 *
279 * Using consecutive numbers for the tags is no good idea in my eyes. There
280 * could be wrong re-usings if the counter (8 bit!) wraps and some early
281 * command has been preempted for a long time. My solution: a bitfield for
282 * remembering used tags.
283 *
284 * There's also the problem that each target has a certain queue size, but we
285 * cannot know it in advance :-( We just see a QUEUE_FULL status being
286 * returned. So, in this case, the driver internal queue size assumption is
287 * reduced to the number of active tags if QUEUE_FULL is returned by the
288 * target. The command is returned to the mid-level, but with status changed
289 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
290 * correctly.
291 *
292 * We're also not allowed running tagged commands as long as an untagged
293 * command is active. And REQUEST SENSE commands after a contingent allegiance
294 * condition _must_ be untagged. To keep track whether an untagged command has
295 * been issued, the host->busy array is still employed, as it is without
296 * support for tagged queuing.
297 *
298 * One could suspect that there are possible race conditions between
299 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
300 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
301 * which already guaranteed to be running at most once. It is also the only
302 * place where tags/LUNs are allocated. So no other allocation can slip
303 * between that pair, there could only happen a reselection, which can free a
304 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
305 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
306 */
307
308/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
309#undef TAG_NONE
310#define TAG_NONE 0xff
311
312/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
313#if (MAX_TAGS % 32) != 0
314#error "MAX_TAGS must be a multiple of 32!"
315#endif
316
317typedef struct {
318 char allocated[MAX_TAGS/8];
319 int nr_allocated;
320 int queue_size;
321} TAG_ALLOC;
322
323static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
324
325
326static void __init init_tags( void )
327{
328 int target, lun;
329 TAG_ALLOC *ta;
330
331 if (!setup_use_tagged_queuing)
332 return;
333
334 for( target = 0; target < 8; ++target ) {
335 for( lun = 0; lun < 8; ++lun ) {
336 ta = &TagAlloc[target][lun];
337 memset( &ta->allocated, 0, MAX_TAGS/8 );
338 ta->nr_allocated = 0;
339 /* At the beginning, assume the maximum queue size we could
340 * support (MAX_TAGS). This value will be decreased if the target
341 * returns QUEUE_FULL status.
342 */
343 ta->queue_size = MAX_TAGS;
344 }
345 }
346}
347
348
349/* Check if we can issue a command to this LUN: First see if the LUN is marked
350 * busy by an untagged command. If the command should use tagged queuing, also
351 * check that there is a free tag and the target's queue won't overflow. This
352 * function should be called with interrupts disabled to avoid race
353 * conditions.
354 */
355
Henne811c9362006-10-03 19:51:59 +0200356static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
358 SETUP_HOSTDATA(cmd->device->host);
359
360 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
361 return( 1 );
362 if (!should_be_tagged ||
363 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
364 return( 0 );
365 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
366 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
367 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
368 H_NO(cmd), cmd->device->id, cmd->device->lun );
369 return( 1 );
370 }
371 return( 0 );
372}
373
374
375/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
376 * must be called before!), or reserve the LUN in 'busy' if the command is
377 * untagged.
378 */
379
Henne811c9362006-10-03 19:51:59 +0200380static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381{
382 SETUP_HOSTDATA(cmd->device->host);
383
384 /* If we or the target don't support tagged queuing, allocate the LUN for
385 * an untagged command.
386 */
387 if (!should_be_tagged ||
388 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
389 cmd->tag = TAG_NONE;
390 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
391 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
392 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
393 }
394 else {
395 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
396
397 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
398 set_bit( cmd->tag, &ta->allocated );
399 ta->nr_allocated++;
400 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
401 "(now %d tags in use)\n",
402 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
403 ta->nr_allocated );
404 }
405}
406
407
408/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
409 * unlock the LUN.
410 */
411
Henne811c9362006-10-03 19:51:59 +0200412static void cmd_free_tag(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
414 SETUP_HOSTDATA(cmd->device->host);
415
416 if (cmd->tag == TAG_NONE) {
417 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
418 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
419 H_NO(cmd), cmd->device->id, cmd->device->lun );
420 }
421 else if (cmd->tag >= MAX_TAGS) {
422 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
423 H_NO(cmd), cmd->tag );
424 }
425 else {
426 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
427 clear_bit( cmd->tag, &ta->allocated );
428 ta->nr_allocated--;
429 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
430 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
431 }
432}
433
434
435static void free_all_tags( void )
436{
437 int target, lun;
438 TAG_ALLOC *ta;
439
440 if (!setup_use_tagged_queuing)
441 return;
442
443 for( target = 0; target < 8; ++target ) {
444 for( lun = 0; lun < 8; ++lun ) {
445 ta = &TagAlloc[target][lun];
446 memset( &ta->allocated, 0, MAX_TAGS/8 );
447 ta->nr_allocated = 0;
448 }
449 }
450}
451
452#endif /* SUPPORT_TAGS */
453
454
455/*
Henne811c9362006-10-03 19:51:59 +0200456 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 *
458 * Purpose : initialize the saved data pointers for cmd to point to the
459 * start of the buffer.
460 *
Henne811c9362006-10-03 19:51:59 +0200461 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 */
463
Henne811c9362006-10-03 19:51:59 +0200464static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
466 /*
467 * Initialize the Scsi Pointer field so that all of the commands in the
468 * various queues are valid.
469 */
470
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200471 if (scsi_bufflen(cmd)) {
472 cmd->SCp.buffer = scsi_sglist(cmd);
473 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
475 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 } else {
477 cmd->SCp.buffer = NULL;
478 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200479 cmd->SCp.ptr = NULL;
480 cmd->SCp.this_residual = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
482
483}
484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485#include <linux/delay.h>
486
487#if 1
488static struct {
489 unsigned char mask;
490 const char * name;}
491signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
492 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
493 { SR_SEL, "SEL" }, {0, NULL}},
494basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
495icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
496 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
497 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
498 {0, NULL}},
499mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
500 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
501 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
502 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
503 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
504 {0, NULL}};
505
506/*
507 * Function : void NCR5380_print(struct Scsi_Host *instance)
508 *
509 * Purpose : print the SCSI bus signals for debugging purposes
510 *
511 * Input : instance - which NCR5380
512 */
513
514static void NCR5380_print(struct Scsi_Host *instance) {
515 unsigned char status, data, basr, mr, icr, i;
516 unsigned long flags;
517
518 local_irq_save(flags);
519 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
520 status = NCR5380_read(STATUS_REG);
521 mr = NCR5380_read(MODE_REG);
522 icr = NCR5380_read(INITIATOR_COMMAND_REG);
523 basr = NCR5380_read(BUS_AND_STATUS_REG);
524 local_irq_restore(flags);
525 printk("STATUS_REG: %02x ", status);
526 for (i = 0; signals[i].mask ; ++i)
527 if (status & signals[i].mask)
528 printk(",%s", signals[i].name);
529 printk("\nBASR: %02x ", basr);
530 for (i = 0; basrs[i].mask ; ++i)
531 if (basr & basrs[i].mask)
532 printk(",%s", basrs[i].name);
533 printk("\nICR: %02x ", icr);
534 for (i = 0; icrs[i].mask; ++i)
535 if (icr & icrs[i].mask)
536 printk(",%s", icrs[i].name);
537 printk("\nMODE: %02x ", mr);
538 for (i = 0; mrs[i].mask; ++i)
539 if (mr & mrs[i].mask)
540 printk(",%s", mrs[i].name);
541 printk("\n");
542}
543
544static struct {
545 unsigned char value;
546 const char *name;
547} phases[] = {
548 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
549 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
550 {PHASE_UNKNOWN, "UNKNOWN"}};
551
552/*
553 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
554 *
555 * Purpose : print the current SCSI phase for debugging purposes
556 *
557 * Input : instance - which NCR5380
558 */
559
560static void NCR5380_print_phase(struct Scsi_Host *instance)
561{
562 unsigned char status;
563 int i;
564
565 status = NCR5380_read(STATUS_REG);
566 if (!(status & SR_REQ))
567 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
568 else {
569 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
570 (phases[i].value != (status & PHASE_MASK)); ++i);
571 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
572 }
573}
574
575#else /* !NDEBUG */
576
577/* dummies... */
578__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
579__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
580
581#endif
582
583/*
584 * ++roman: New scheme of calling NCR5380_main()
585 *
586 * If we're not in an interrupt, we can call our main directly, it cannot be
587 * already running. Else, we queue it on a task queue, if not 'main_running'
588 * tells us that a lower level is already executing it. This way,
589 * 'main_running' needs not be protected in a special way.
590 *
591 * queue_main() is a utility function for putting our main onto the task
592 * queue, if main_running is false. It should be called only from a
593 * interrupt or bottom half.
594 */
595
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900596#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597#include <linux/workqueue.h>
598#include <linux/interrupt.h>
599
600static volatile int main_running = 0;
Al Viro2bb71b52006-12-14 15:00:15 +0000601static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
603static __inline__ void queue_main(void)
604{
605 if (!main_running) {
606 /* If in interrupt and NCR5380_main() not already running,
607 queue it on the 'immediate' task queue, to be processed
608 immediately after the current interrupt processing has
609 finished. */
610 schedule_work(&NCR5380_tqueue);
611 }
612 /* else: nothing to do: the running NCR5380_main() will pick up
613 any newly queued command. */
614}
615
616
617static inline void NCR5380_all_init (void)
618{
619 static int done = 0;
620 if (!done) {
621 INI_PRINTK("scsi : NCR5380_all_init()\n");
622 done = 1;
623 }
624}
625
626
627/*
628 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
629 *
630 * Purpose : called by probe code indicating the NCR5380 driver
631 * options that were selected.
632 *
633 * Inputs : instance, pointer to this instance. Unused.
634 */
635
636static void __init NCR5380_print_options (struct Scsi_Host *instance)
637{
638 printk(" generic options"
639#ifdef AUTOSENSE
640 " AUTOSENSE"
641#endif
642#ifdef REAL_DMA
643 " REAL DMA"
644#endif
645#ifdef PARITY
646 " PARITY"
647#endif
648#ifdef SUPPORT_TAGS
649 " SCSI-2 TAGGED QUEUING"
650#endif
651 );
652 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
653}
654
655/*
656 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
657 *
658 * Purpose : print commands in the various queues, called from
659 * NCR5380_abort and NCR5380_debug to aid debugging.
660 *
661 * Inputs : instance, pointer to this instance.
662 */
663
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200664static void lprint_Scsi_Cmnd(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665{
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200666 int i, s;
667 unsigned char *command;
668 printk("scsi%d: destination target %d, lun %d\n",
669 H_NO(cmd), cmd->device->id, cmd->device->lun);
670 printk(KERN_CONT " command = ");
671 command = cmd->cmnd;
672 printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]);
673 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
674 printk(KERN_CONT " %02x", command[i]);
675 printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200678static void NCR5380_print_status(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200680 struct NCR5380_hostdata *hostdata;
681 Scsi_Cmnd *ptr;
682 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200684 NCR_PRINT(NDEBUG_ANY);
685 NCR_PRINT_PHASE(NDEBUG_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200687 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200689 printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
690 local_irq_save(flags);
691 printk("NCR5380: coroutine is%s running.\n",
692 main_running ? "" : "n't");
693 if (!hostdata->connected)
694 printk("scsi%d: no currently connected command\n", HOSTNO);
695 else
696 lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected);
697 printk("scsi%d: issue_queue\n", HOSTNO);
698 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
699 lprint_Scsi_Cmnd(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Geert Uytterhoeven9dcc26c2013-04-10 13:52:09 +0200701 printk("scsi%d: disconnected_queue\n", HOSTNO);
702 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
703 ptr = NEXT(ptr))
704 lprint_Scsi_Cmnd(ptr);
705
706 local_irq_restore(flags);
707 printk("\n");
708}
709
710static void show_Scsi_Cmnd(Scsi_Cmnd *cmd, struct seq_file *m)
711{
712 int i, s;
713 unsigned char *command;
714 seq_printf(m, "scsi%d: destination target %d, lun %d\n",
715 H_NO(cmd), cmd->device->id, cmd->device->lun);
716 seq_printf(m, " command = ");
717 command = cmd->cmnd;
718 seq_printf(m, "%2d (0x%02x)", command[0], command[0]);
719 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
720 seq_printf(m, " %02x", command[i]);
721 seq_printf(m, "\n");
722}
723
724static int NCR5380_show_info(struct seq_file *m, struct Scsi_Host *instance)
725{
726 struct NCR5380_hostdata *hostdata;
727 Scsi_Cmnd *ptr;
728 unsigned long flags;
729
730 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
731
732 seq_printf(m, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
733 local_irq_save(flags);
734 seq_printf(m, "NCR5380: coroutine is%s running.\n",
735 main_running ? "" : "n't");
736 if (!hostdata->connected)
737 seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);
738 else
739 show_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m);
740 seq_printf(m, "scsi%d: issue_queue\n", HOSTNO);
741 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
742 show_Scsi_Cmnd(ptr, m);
743
744 seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO);
745 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
746 ptr = NEXT(ptr))
747 show_Scsi_Cmnd(ptr, m);
748
749 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751}
752
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753/*
754 * Function : void NCR5380_init (struct Scsi_Host *instance)
755 *
756 * Purpose : initializes *instance and corresponding 5380 chip.
757 *
758 * Inputs : instance - instantiation of the 5380 driver.
759 *
760 * Notes : I assume that the host, hostno, and id bits have been
761 * set correctly. I don't care about the irq and other fields.
762 *
763 */
764
Geert Uytterhoevend559c492011-06-13 20:39:18 +0200765static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
767 int i;
768 SETUP_HOSTDATA(instance);
769
770 NCR5380_all_init();
771
772 hostdata->aborted = 0;
773 hostdata->id_mask = 1 << instance->this_id;
774 hostdata->id_higher_mask = 0;
775 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
776 if (i > hostdata->id_mask)
777 hostdata->id_higher_mask |= i;
778 for (i = 0; i < 8; ++i)
779 hostdata->busy[i] = 0;
780#ifdef SUPPORT_TAGS
781 init_tags();
782#endif
783#if defined (REAL_DMA)
784 hostdata->dma_len = 0;
785#endif
786 hostdata->targets_present = 0;
787 hostdata->connected = NULL;
788 hostdata->issue_queue = NULL;
789 hostdata->disconnected_queue = NULL;
790 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
791
792 if (!the_template) {
793 the_template = instance->hostt;
794 first_instance = instance;
795 }
796
797
798#ifndef AUTOSENSE
799 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
800 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
801 " without AUTOSENSE option, contingent allegiance conditions may\n"
802 " be incorrectly cleared.\n", HOSTNO);
803#endif /* def AUTOSENSE */
804
805 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
806 NCR5380_write(MODE_REG, MR_BASE);
807 NCR5380_write(TARGET_COMMAND_REG, 0);
808 NCR5380_write(SELECT_ENABLE_REG, 0);
809
810 return 0;
811}
812
Geert Uytterhoeven19b6c512011-06-13 20:39:19 +0200813static void NCR5380_exit(struct Scsi_Host *instance)
814{
815 /* Empty, as we didn't schedule any delayed work */
816}
817
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818/*
Henne811c9362006-10-03 19:51:59 +0200819 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
820 * void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 *
822 * Purpose : enqueues a SCSI command
823 *
824 * Inputs : cmd - SCSI command, done - function called on completion, with
825 * a pointer to the command descriptor.
826 *
827 * Returns : 0
828 *
829 * Side effects :
830 * cmd is added to the per instance issue_queue, with minor
831 * twiddling done to the host specific fields of cmd. If the
832 * main coroutine is not running, it is restarted.
833 *
834 */
835
836/* Only make static if a wrapper function is used */
Jeff Garzikf2812332010-11-16 02:10:29 -0500837static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd,
Henne811c9362006-10-03 19:51:59 +0200838 void (*done)(struct scsi_cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
840 SETUP_HOSTDATA(cmd->device->host);
Henne811c9362006-10-03 19:51:59 +0200841 struct scsi_cmnd *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 unsigned long flags;
843
844#if (NDEBUG & NDEBUG_NO_WRITE)
845 switch (cmd->cmnd[0]) {
846 case WRITE_6:
847 case WRITE_10:
848 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
849 H_NO(cmd));
850 cmd->result = (DID_ERROR << 16);
851 done(cmd);
852 return 0;
853 }
854#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
855
856
857#ifdef NCR5380_STATS
858# if 0
859 if (!hostdata->connected && !hostdata->issue_queue &&
860 !hostdata->disconnected_queue) {
861 hostdata->timebase = jiffies;
862 }
863# endif
864# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200865 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866# endif
867 switch (cmd->cmnd[0])
868 {
869 case WRITE:
870 case WRITE_6:
871 case WRITE_10:
872 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200873 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 hostdata->pendingw++;
875 break;
876 case READ:
877 case READ_6:
878 case READ_10:
879 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200880 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 hostdata->pendingr++;
882 break;
883 }
884#endif
885
886 /*
887 * We use the host_scribble field as a pointer to the next command
888 * in a queue
889 */
890
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200891 SET_NEXT(cmd, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 cmd->scsi_done = done;
893
894 cmd->result = 0;
895
896
897 /*
898 * Insert the cmd into the issue queue. Note that REQUEST SENSE
899 * commands are added to the head of the queue since any command will
900 * clear the contingent allegiance condition that exists and the
901 * sense data is only guaranteed to be valid while the condition exists.
902 */
903
904 local_irq_save(flags);
905 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
906 * Otherwise a running NCR5380_main may steal the lock.
907 * Lock before actually inserting due to fairness reasons explained in
908 * atari_scsi.c. If we insert first, then it's impossible for this driver
909 * to release the lock.
910 * Stop timer for this command while waiting for the lock, or timeouts
911 * may happen (and they really do), and it's no good if the command doesn't
912 * appear in any of the queues.
913 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
914 * because also a timer int can trigger an abort or reset, which would
915 * alter queues and touch the lock.
916 */
917 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
918 LIST(cmd, hostdata->issue_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200919 SET_NEXT(cmd, hostdata->issue_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 hostdata->issue_queue = cmd;
921 } else {
Henne811c9362006-10-03 19:51:59 +0200922 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 NEXT(tmp); tmp = NEXT(tmp))
924 ;
925 LIST(cmd, tmp);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +0200926 SET_NEXT(tmp, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 }
928
929 local_irq_restore(flags);
930
931 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
932 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
933
934 /* If queue_command() is called from an interrupt (real one or bottom
935 * half), we let queue_main() do the job of taking care about main. If it
936 * is already running, this is a no-op, else main will be queued.
937 *
938 * If we're not in an interrupt, we can call NCR5380_main()
939 * unconditionally, because it cannot be already running.
940 */
941 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
942 queue_main();
943 else
944 NCR5380_main(NULL);
945 return 0;
946}
947
Jeff Garzikf2812332010-11-16 02:10:29 -0500948static DEF_SCSI_QCMD(NCR5380_queue_command)
949
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950/*
951 * Function : NCR5380_main (void)
952 *
953 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
954 * be done on the NCR5380 host adapters in a system. Both
955 * NCR5380_queue_command() and NCR5380_intr() will try to start it
956 * in case it is not running.
957 *
958 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
959 * reenable them. This prevents reentrancy and kernel stack overflow.
960 */
961
Al Viro2bb71b52006-12-14 15:00:15 +0000962static void NCR5380_main (struct work_struct *bl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963{
Henne811c9362006-10-03 19:51:59 +0200964 struct scsi_cmnd *tmp, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 struct Scsi_Host *instance = first_instance;
966 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
967 int done;
968 unsigned long flags;
969
970 /*
971 * We run (with interrupts disabled) until we're sure that none of
972 * the host adapters have anything that can be done, at which point
973 * we set main_running to 0 and exit.
974 *
975 * Interrupts are enabled before doing various other internal
976 * instructions, after we've decided that we need to run through
977 * the loop again.
978 *
979 * this should prevent any race conditions.
980 *
981 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
982 * because also a timer int can trigger an abort or reset, which can
983 * alter queues and touch the Falcon lock.
984 */
985
986 /* Tell int handlers main() is now already executing. Note that
987 no races are possible here. If an int comes in before
988 'main_running' is set here, and queues/executes main via the
989 task queue, it doesn't do any harm, just this instance of main
990 won't find any work left to do. */
991 if (main_running)
992 return;
993 main_running = 1;
994
995 local_save_flags(flags);
996 do {
997 local_irq_disable(); /* Freeze request queues */
998 done = 1;
999
1000 if (!hostdata->connected) {
1001 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1002 /*
1003 * Search through the issue_queue for a command destined
1004 * for a target that's not busy.
1005 */
1006#if (NDEBUG & NDEBUG_LISTS)
Henne811c9362006-10-03 19:51:59 +02001007 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1009 ;
1010 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1011#endif
Henne811c9362006-10-03 19:51:59 +02001012 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1014
1015#if (NDEBUG & NDEBUG_LISTS)
1016 if (prev != tmp)
1017 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1018 tmp, tmp->target, hostdata->busy[tmp->target],
1019 tmp->lun);
1020#endif
1021 /* When we find one, remove it from the issue queue. */
1022 /* ++guenther: possible race with Falcon locking */
1023 if (
1024#ifdef SUPPORT_TAGS
1025 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1026#else
1027 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1028#endif
1029 ) {
1030 /* ++guenther: just to be sure, this must be atomic */
1031 local_irq_disable();
1032 if (prev) {
1033 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001034 SET_NEXT(prev, NEXT(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 } else {
1036 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1037 hostdata->issue_queue = NEXT(tmp);
1038 }
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001039 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 /* reenable interrupts after finding one */
1042 local_irq_restore(flags);
1043
1044 /*
1045 * Attempt to establish an I_T_L nexus here.
1046 * On success, instance->hostdata->connected is set.
1047 * On failure, we must add the command back to the
1048 * issue queue so we can keep trying.
1049 */
1050 MAIN_PRINTK("scsi%d: main(): command for target %d "
1051 "lun %d removed from issue_queue\n",
1052 HOSTNO, tmp->target, tmp->lun);
1053 /*
1054 * REQUEST SENSE commands are issued without tagged
1055 * queueing, even on SCSI-II devices because the
1056 * contingent allegiance condition exists for the
1057 * entire unit.
1058 */
1059 /* ++roman: ...and the standard also requires that
1060 * REQUEST SENSE command are untagged.
1061 */
1062
1063#ifdef SUPPORT_TAGS
1064 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1065#endif
1066 if (!NCR5380_select(instance, tmp,
1067 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1068 TAG_NEXT)) {
1069 break;
1070 } else {
1071 local_irq_disable();
1072 LIST(tmp, hostdata->issue_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02001073 SET_NEXT(tmp, hostdata->issue_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 hostdata->issue_queue = tmp;
1075#ifdef SUPPORT_TAGS
1076 cmd_free_tag( tmp );
1077#endif
1078 local_irq_restore(flags);
1079 MAIN_PRINTK("scsi%d: main(): select() failed, "
1080 "returned to issue_queue\n", HOSTNO);
1081 if (hostdata->connected)
1082 break;
1083 }
1084 } /* if target/lun/target queue is not busy */
1085 } /* for issue_queue */
1086 } /* if (!hostdata->connected) */
1087 if (hostdata->connected
1088#ifdef REAL_DMA
1089 && !hostdata->dma_len
1090#endif
1091 ) {
1092 local_irq_restore(flags);
1093 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1094 HOSTNO);
1095 NCR5380_information_transfer(instance);
1096 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1097 done = 0;
1098 }
1099 } while (!done);
1100
1101 /* Better allow ints _after_ 'main_running' has been cleared, else
1102 an interrupt could believe we'll pick up the work it left for
1103 us, but we won't see it anymore here... */
1104 main_running = 0;
1105 local_irq_restore(flags);
1106}
1107
1108
1109#ifdef REAL_DMA
1110/*
1111 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1112 *
1113 * Purpose : Called by interrupt handler when DMA finishes or a phase
1114 * mismatch occurs (which would finish the DMA transfer).
1115 *
1116 * Inputs : instance - this instance of the NCR5380.
1117 *
1118 */
1119
1120static void NCR5380_dma_complete( struct Scsi_Host *instance )
1121{
1122 SETUP_HOSTDATA(instance);
1123 int transfered;
1124 unsigned char **data;
1125 volatile int *count;
1126
1127 if (!hostdata->connected) {
1128 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1129 "no connected cmd\n", HOSTNO);
1130 return;
1131 }
1132
1133 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1134 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1135 NCR5380_read(STATUS_REG));
1136
1137 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1138 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1139 printk("please e-mail sammy@sammy.net with a description of how this\n");
1140 printk("error was produced.\n");
1141 BUG();
1142 }
1143
1144 /* make sure we're not stuck in a data phase */
1145 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1146 BASR_ACK)) ==
1147 (BASR_PHASE_MATCH | BASR_ACK)) {
1148 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1149 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1150 "overrun!\n", HOSTNO);
1151 printk("not prepared for this error!\n");
1152 printk("please e-mail sammy@sammy.net with a description of how this\n");
1153 printk("error was produced.\n");
1154 BUG();
1155 }
1156
1157
1158
1159 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1160 NCR5380_write(MODE_REG, MR_BASE);
1161 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1162
1163 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1164 hostdata->dma_len = 0;
1165
1166 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1167 count = &(hostdata->connected->SCp.this_residual);
1168 *data += transfered;
1169 *count -= transfered;
1170
1171}
1172#endif /* REAL_DMA */
1173
1174
1175/*
1176 * Function : void NCR5380_intr (int irq)
1177 *
1178 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1179 * from the disconnected queue, and restarting NCR5380_main()
1180 * as required.
1181 *
1182 * Inputs : int irq, irq that caused this interrupt.
1183 *
1184 */
1185
David Howells7d12e782006-10-05 14:55:46 +01001186static irqreturn_t NCR5380_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187{
1188 struct Scsi_Host *instance = first_instance;
1189 int done = 1, handled = 0;
1190 unsigned char basr;
1191
1192 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1193
1194 /* Look for pending interrupts */
1195 basr = NCR5380_read(BUS_AND_STATUS_REG);
1196 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1197 /* dispatch to appropriate routine if found and done=0 */
1198 if (basr & BASR_IRQ) {
1199 NCR_PRINT(NDEBUG_INTR);
1200 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1201 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001202// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1204 NCR5380_reselect(instance);
1205 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1206 }
1207 else if (basr & BASR_PARITY_ERROR) {
1208 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1209 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1210 }
1211 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1212 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1213 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1214 }
1215 else {
1216 /*
1217 * The rest of the interrupt conditions can occur only during a
1218 * DMA transfer
1219 */
1220
1221#if defined(REAL_DMA)
1222 /*
1223 * We should only get PHASE MISMATCH and EOP interrupts if we have
1224 * DMA enabled, so do a sanity check based on the current setting
1225 * of the MODE register.
1226 */
1227
1228 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1229 ((basr & BASR_END_DMA_TRANSFER) ||
1230 !(basr & BASR_PHASE_MATCH))) {
1231
1232 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1233 NCR5380_dma_complete( instance );
1234 done = 0;
Sam Creaseyc39e7ee2006-12-09 10:37:05 +01001235// ENABLE_IRQ();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 } else
1237#endif /* REAL_DMA */
1238 {
1239/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1240 if (basr & BASR_PHASE_MATCH)
1241 INT_PRINTK("scsi%d: unknown interrupt, "
1242 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1243 HOSTNO, basr, NCR5380_read(MODE_REG),
1244 NCR5380_read(STATUS_REG));
1245 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1246#ifdef SUN3_SCSI_VME
1247 dregs->csr |= CSR_DMA_ENABLE;
1248#endif
1249 }
1250 } /* if !(SELECTION || PARITY) */
1251 handled = 1;
1252 } /* BASR & IRQ */
1253 else {
1254
1255 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1256 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1257 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1258 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1259#ifdef SUN3_SCSI_VME
1260 dregs->csr |= CSR_DMA_ENABLE;
1261#endif
1262 }
1263
1264 if (!done) {
1265 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1266 /* Put a call to NCR5380_main() on the queue... */
1267 queue_main();
1268 }
1269 return IRQ_RETVAL(handled);
1270}
1271
1272#ifdef NCR5380_STATS
Henne811c9362006-10-03 19:51:59 +02001273static void collect_stats(struct NCR5380_hostdata *hostdata,
1274 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
1276# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001277 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278# endif
1279 switch (cmd->cmnd[0])
1280 {
1281 case WRITE:
1282 case WRITE_6:
1283 case WRITE_10:
1284 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001285 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 hostdata->pendingw--;
1287 break;
1288 case READ:
1289 case READ_6:
1290 case READ_10:
1291 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001292 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 hostdata->pendingr--;
1294 break;
1295 }
1296}
1297#endif
1298
1299/*
Henne811c9362006-10-03 19:51:59 +02001300 * Function : int NCR5380_select(struct Scsi_Host *instance,
1301 * struct scsi_cmnd *cmd, int tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 *
1303 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1304 * including ARBITRATION, SELECTION, and initial message out for
1305 * IDENTIFY and queue messages.
1306 *
1307 * Inputs : instance - instantiation of the 5380 driver on which this
1308 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1309 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1310 * the command that is presently connected.
1311 *
1312 * Returns : -1 if selection could not execute for some reason,
1313 * 0 if selection succeeded or failed because the target
1314 * did not respond.
1315 *
1316 * Side effects :
1317 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1318 * with registers as they should have been on entry - ie
1319 * SELECT_ENABLE will be set appropriately, the NCR5380
1320 * will cease to drive any SCSI bus signals.
1321 *
1322 * If successful : I_T_L or I_T_L_Q nexus will be established,
1323 * instance->connected will be set to cmd.
1324 * SELECT interrupt will be disabled.
1325 *
1326 * If failed (no target) : cmd->scsi_done() will be called, and the
1327 * cmd->result host byte set to DID_BAD_TARGET.
1328 */
1329
Henne811c9362006-10-03 19:51:59 +02001330static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1331 int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332{
1333 SETUP_HOSTDATA(instance);
1334 unsigned char tmp[3], phase;
1335 unsigned char *data;
1336 int len;
1337 unsigned long timeout;
1338 unsigned long flags;
1339
1340 hostdata->restart_select = 0;
1341 NCR_PRINT(NDEBUG_ARBITRATION);
1342 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1343 instance->this_id);
1344
1345 /*
1346 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1347 * data bus during SELECTION.
1348 */
1349
1350 local_irq_save(flags);
1351 if (hostdata->connected) {
1352 local_irq_restore(flags);
1353 return -1;
1354 }
1355 NCR5380_write(TARGET_COMMAND_REG, 0);
1356
1357
1358 /*
1359 * Start arbitration.
1360 */
1361
1362 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1363 NCR5380_write(MODE_REG, MR_ARBITRATE);
1364
1365 local_irq_restore(flags);
1366
1367 /* Wait for arbitration logic to complete */
Geert Uytterhoeven0cb8cd72011-06-13 20:39:20 +02001368#ifdef NCR_TIMEOUT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 {
1370 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1371
1372 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1373 && time_before(jiffies, timeout) && !hostdata->connected)
1374 ;
1375 if (time_after_eq(jiffies, timeout))
1376 {
1377 printk("scsi : arbitration timeout at %d\n", __LINE__);
1378 NCR5380_write(MODE_REG, MR_BASE);
1379 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1380 return -1;
1381 }
1382 }
1383#else /* NCR_TIMEOUT */
1384 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1385 && !hostdata->connected);
1386#endif
1387
1388 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1389
1390 if (hostdata->connected) {
1391 NCR5380_write(MODE_REG, MR_BASE);
1392 return -1;
1393 }
1394 /*
1395 * The arbitration delay is 2.2us, but this is a minimum and there is
1396 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1397 * the integral nature of udelay().
1398 *
1399 */
1400
1401 udelay(3);
1402
1403 /* Check for lost arbitration */
1404 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1405 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1406 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1407 hostdata->connected) {
1408 NCR5380_write(MODE_REG, MR_BASE);
1409 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1410 HOSTNO);
1411 return -1;
1412 }
1413
1414 /* after/during arbitration, BSY should be asserted.
1415 IBM DPES-31080 Version S31Q works now */
1416 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1417 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1418 ICR_ASSERT_BSY ) ;
1419
1420 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1421 hostdata->connected) {
1422 NCR5380_write(MODE_REG, MR_BASE);
1423 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1424 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1425 HOSTNO);
1426 return -1;
1427 }
1428
1429 /*
1430 * Again, bus clear + bus settle time is 1.2us, however, this is
1431 * a minimum so we'll udelay ceil(1.2)
1432 */
1433
1434#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1435 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1436 udelay(15);
1437#else
1438 udelay(2);
1439#endif
1440
1441 if (hostdata->connected) {
1442 NCR5380_write(MODE_REG, MR_BASE);
1443 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1444 return -1;
1445 }
1446
1447 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1448
1449 /*
1450 * Now that we have won arbitration, start Selection process, asserting
1451 * the host and target ID's on the SCSI bus.
1452 */
1453
1454 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1455
1456 /*
1457 * Raise ATN while SEL is true before BSY goes false from arbitration,
1458 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1459 * phase immediately after selection.
1460 */
1461
1462 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1463 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1464 NCR5380_write(MODE_REG, MR_BASE);
1465
1466 /*
1467 * Reselect interrupts must be turned off prior to the dropping of BSY,
1468 * otherwise we will trigger an interrupt.
1469 */
1470
1471 if (hostdata->connected) {
1472 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1473 return -1;
1474 }
1475
1476 NCR5380_write(SELECT_ENABLE_REG, 0);
1477
1478 /*
1479 * The initiator shall then wait at least two deskew delays and release
1480 * the BSY signal.
1481 */
1482 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1483
1484 /* Reset BSY */
1485 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1486 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1487
1488 /*
1489 * Something weird happens when we cease to drive BSY - looks
1490 * like the board/chip is letting us do another read before the
1491 * appropriate propagation delay has expired, and we're confusing
1492 * a BSY signal from ourselves as the target's response to SELECTION.
1493 *
1494 * A small delay (the 'C++' frontend breaks the pipeline with an
1495 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1496 * tighter 'C' code breaks and requires this) solves the problem -
1497 * the 1 us delay is arbitrary, and only used because this delay will
1498 * be the same on other platforms and since it works here, it should
1499 * work there.
1500 *
1501 * wingel suggests that this could be due to failing to wait
1502 * one deskew delay.
1503 */
1504
1505 udelay(1);
1506
1507 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1508
1509 /*
1510 * The SCSI specification calls for a 250 ms timeout for the actual
1511 * selection.
1512 */
1513
1514 timeout = jiffies + 25;
1515
1516 /*
1517 * XXX very interesting - we're seeing a bounce where the BSY we
1518 * asserted is being reflected / still asserted (propagation delay?)
1519 * and it's detecting as true. Sigh.
1520 */
1521
1522#if 0
1523 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1524 * IO while SEL is true. But again, there are some disks out the in the
1525 * world that do that nevertheless. (Somebody claimed that this announces
1526 * reselection capability of the target.) So we better skip that test and
Jan Engelhardt96de0e22007-10-19 23:21:04 +02001527 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 */
1529
1530 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1531 (SR_BSY | SR_IO)));
1532
1533 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1534 (SR_SEL | SR_IO)) {
1535 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1536 NCR5380_reselect(instance);
1537 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1538 HOSTNO);
1539 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1540 return -1;
1541 }
1542#else
1543 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1544#endif
1545
1546 /*
1547 * No less than two deskew delays after the initiator detects the
1548 * BSY signal is true, it shall release the SEL signal and may
1549 * change the DATA BUS. -wingel
1550 */
1551
1552 udelay(1);
1553
1554 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1555
1556 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1557 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1558 if (hostdata->targets_present & (1 << cmd->device->id)) {
1559 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1560 if (hostdata->restart_select)
1561 printk(KERN_NOTICE "\trestart select\n");
1562 NCR_PRINT(NDEBUG_ANY);
1563 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1564 return -1;
1565 }
1566 cmd->result = DID_BAD_TARGET << 16;
1567#ifdef NCR5380_STATS
1568 collect_stats(hostdata, cmd);
1569#endif
1570#ifdef SUPPORT_TAGS
1571 cmd_free_tag( cmd );
1572#endif
1573 cmd->scsi_done(cmd);
1574 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1575 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1576 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1577 return 0;
1578 }
1579
1580 hostdata->targets_present |= (1 << cmd->device->id);
1581
1582 /*
1583 * Since we followed the SCSI spec, and raised ATN while SEL
1584 * was true but before BSY was false during selection, the information
1585 * transfer phase should be a MESSAGE OUT phase so that we can send the
1586 * IDENTIFY message.
1587 *
1588 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1589 * message (2 bytes) with a tag ID that we increment with every command
1590 * until it wraps back to 0.
1591 *
1592 * XXX - it turns out that there are some broken SCSI-II devices,
1593 * which claim to support tagged queuing but fail when more than
1594 * some number of commands are issued at once.
1595 */
1596
1597 /* Wait for start of REQ/ACK handshake */
1598 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1599
1600 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1601 HOSTNO, cmd->device->id);
1602 tmp[0] = IDENTIFY(1, cmd->device->lun);
1603
1604#ifdef SUPPORT_TAGS
1605 if (cmd->tag != TAG_NONE) {
1606 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1607 tmp[2] = cmd->tag;
1608 len = 3;
1609 } else
1610 len = 1;
1611#else
1612 len = 1;
1613 cmd->tag=0;
1614#endif /* SUPPORT_TAGS */
1615
1616 /* Send message(s) */
1617 data = tmp;
1618 phase = PHASE_MSGOUT;
1619 NCR5380_transfer_pio(instance, &phase, &len, &data);
1620 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1621 /* XXX need to handle errors here */
1622 hostdata->connected = cmd;
1623#ifndef SUPPORT_TAGS
1624 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1625#endif
1626#ifdef SUN3_SCSI_VME
1627 dregs->csr |= CSR_INTR;
1628#endif
1629 initialize_SCp(cmd);
1630
1631
1632 return 0;
1633}
1634
1635/*
1636 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1637 * unsigned char *phase, int *count, unsigned char **data)
1638 *
1639 * Purpose : transfers data in given phase using polled I/O
1640 *
1641 * Inputs : instance - instance of driver, *phase - pointer to
1642 * what phase is expected, *count - pointer to number of
1643 * bytes to transfer, **data - pointer to data pointer.
1644 *
1645 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001646 * maximum number of bytes, 0 if all bytes are transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 * is in same phase.
1648 *
1649 * Also, *phase, *count, *data are modified in place.
1650 *
1651 * XXX Note : handling for bus free may be useful.
1652 */
1653
1654/*
1655 * Note : this code is not as quick as it could be, however it
1656 * IS 100% reliable, and for the actual data transfer where speed
1657 * counts, we will always do a pseudo DMA or DMA transfer.
1658 */
1659
1660static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1661 unsigned char *phase, int *count,
1662 unsigned char **data)
1663{
1664 register unsigned char p = *phase, tmp;
1665 register int c = *count;
1666 register unsigned char *d = *data;
1667
1668 /*
1669 * The NCR5380 chip will only drive the SCSI bus when the
1670 * phase specified in the appropriate bits of the TARGET COMMAND
1671 * REGISTER match the STATUS REGISTER
1672 */
1673
1674 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1675
1676 do {
1677 /*
1678 * Wait for assertion of REQ, after which the phase bits will be
1679 * valid
1680 */
1681 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1682
1683 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1684
1685 /* Check for phase mismatch */
1686 if ((tmp & PHASE_MASK) != p) {
1687 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1688 NCR_PRINT_PHASE(NDEBUG_PIO);
1689 break;
1690 }
1691
1692 /* Do actual transfer from SCSI bus to / from memory */
1693 if (!(p & SR_IO))
1694 NCR5380_write(OUTPUT_DATA_REG, *d);
1695 else
1696 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1697
1698 ++d;
1699
1700 /*
1701 * The SCSI standard suggests that in MSGOUT phase, the initiator
1702 * should drop ATN on the last byte of the message phase
1703 * after REQ has been asserted for the handshake but before
1704 * the initiator raises ACK.
1705 */
1706
1707 if (!(p & SR_IO)) {
1708 if (!((p & SR_MSG) && c > 1)) {
1709 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1710 ICR_ASSERT_DATA);
1711 NCR_PRINT(NDEBUG_PIO);
1712 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1713 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1714 } else {
1715 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1716 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1717 NCR_PRINT(NDEBUG_PIO);
1718 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1719 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1720 }
1721 } else {
1722 NCR_PRINT(NDEBUG_PIO);
1723 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1724 }
1725
1726 while (NCR5380_read(STATUS_REG) & SR_REQ);
1727
1728 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1729
1730/*
1731 * We have several special cases to consider during REQ/ACK handshaking :
1732 * 1. We were in MSGOUT phase, and we are on the last byte of the
1733 * message. ATN must be dropped as ACK is dropped.
1734 *
1735 * 2. We are in a MSGIN phase, and we are on the last byte of the
1736 * message. We must exit with ACK asserted, so that the calling
1737 * code may raise ATN before dropping ACK to reject the message.
1738 *
1739 * 3. ACK and ATN are clear and the target may proceed as normal.
1740 */
1741 if (!(p == PHASE_MSGIN && c == 1)) {
1742 if (p == PHASE_MSGOUT && c > 1)
1743 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1744 else
1745 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1746 }
1747 } while (--c);
1748
1749 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1750
1751 *count = c;
1752 *data = d;
1753 tmp = NCR5380_read(STATUS_REG);
1754 /* The phase read from the bus is valid if either REQ is (already)
1755 * asserted or if ACK hasn't been released yet. The latter is the case if
1756 * we're in MSGIN and all wanted bytes have been received. */
1757 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1758 *phase = tmp & PHASE_MASK;
1759 else
1760 *phase = PHASE_UNKNOWN;
1761
1762 if (!c || (*phase == p))
1763 return 0;
1764 else
1765 return -1;
1766}
1767
1768/*
1769 * Function : do_abort (Scsi_Host *host)
1770 *
1771 * Purpose : abort the currently established nexus. Should only be
1772 * called from a routine which can drop into a
1773 *
1774 * Returns : 0 on success, -1 on failure.
1775 */
1776
1777static int do_abort (struct Scsi_Host *host)
1778{
1779 unsigned char tmp, *msgptr, phase;
1780 int len;
1781
1782 /* Request message out phase */
1783 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1784
1785 /*
1786 * Wait for the target to indicate a valid phase by asserting
1787 * REQ. Once this happens, we'll have either a MSGOUT phase
1788 * and can immediately send the ABORT message, or we'll have some
1789 * other phase and will have to source/sink data.
1790 *
1791 * We really don't care what value was on the bus or what value
1792 * the target sees, so we just handshake.
1793 */
1794
Roel Kluin3be38e72007-11-15 21:13:46 +01001795 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796
1797 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1798
1799 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1800 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1801 ICR_ASSERT_ACK);
1802 while (NCR5380_read(STATUS_REG) & SR_REQ);
1803 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1804 }
1805
1806 tmp = ABORT;
1807 msgptr = &tmp;
1808 len = 1;
1809 phase = PHASE_MSGOUT;
1810 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1811
1812 /*
1813 * If we got here, and the command completed successfully,
1814 * we're about to go into bus free state.
1815 */
1816
1817 return len ? -1 : 0;
1818}
1819
1820#if defined(REAL_DMA)
1821/*
1822 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1823 * unsigned char *phase, int *count, unsigned char **data)
1824 *
1825 * Purpose : transfers data in given phase using either real
1826 * or pseudo DMA.
1827 *
1828 * Inputs : instance - instance of driver, *phase - pointer to
1829 * what phase is expected, *count - pointer to number of
1830 * bytes to transfer, **data - pointer to data pointer.
1831 *
1832 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001833 * maximum number of bytes, 0 if all bytes or transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 * is in same phase.
1835 *
1836 * Also, *phase, *count, *data are modified in place.
1837 *
1838 */
1839
1840
1841static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1842 unsigned char *phase, int *count,
1843 unsigned char **data)
1844{
1845 SETUP_HOSTDATA(instance);
1846 register int c = *count;
1847 register unsigned char p = *phase;
1848 unsigned long flags;
1849
1850 /* sanity check */
1851 if(!sun3_dma_setup_done) {
1852 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1853 BUG();
1854 }
1855 hostdata->dma_len = c;
1856
1857 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1858 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1859 c, (p & SR_IO) ? "to" : "from", *data);
1860
1861 /* netbsd turns off ints here, why not be safe and do it too */
1862 local_irq_save(flags);
1863
1864 /* send start chain */
1865 sun3scsi_dma_start(c, *data);
1866
1867 if (p & SR_IO) {
1868 NCR5380_write(TARGET_COMMAND_REG, 1);
1869 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1870 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1871 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1872 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1873 } else {
1874 NCR5380_write(TARGET_COMMAND_REG, 0);
1875 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1876 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1877 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1878 NCR5380_write(START_DMA_SEND_REG, 0);
1879 }
1880
1881#ifdef SUN3_SCSI_VME
1882 dregs->csr |= CSR_DMA_ENABLE;
1883#endif
1884
1885 local_irq_restore(flags);
1886
1887 sun3_dma_active = 1;
1888 return 0;
1889}
1890#endif /* defined(REAL_DMA) */
1891
1892/*
1893 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1894 *
1895 * Purpose : run through the various SCSI phases and do as the target
1896 * directs us to. Operates on the currently connected command,
1897 * instance->connected.
1898 *
1899 * Inputs : instance, instance for which we are doing commands
1900 *
1901 * Side effects : SCSI things happen, the disconnected queue will be
1902 * modified if a command disconnects, *instance->connected will
1903 * change.
1904 *
1905 * XXX Note : we need to watch for bus free or a reset condition here
1906 * to recover from an unexpected bus free condition.
1907 */
1908
1909static void NCR5380_information_transfer (struct Scsi_Host *instance)
1910{
1911 SETUP_HOSTDATA(instance);
1912 unsigned long flags;
1913 unsigned char msgout = NOP;
1914 int sink = 0;
1915 int len;
1916#if defined(REAL_DMA)
1917 int transfersize;
1918#endif
1919 unsigned char *data;
1920 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
Henne811c9362006-10-03 19:51:59 +02001921 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
1923#ifdef SUN3_SCSI_VME
1924 dregs->csr |= CSR_INTR;
1925#endif
1926
1927 while (1) {
1928 tmp = NCR5380_read(STATUS_REG);
1929 /* We only have a valid SCSI phase when REQ is asserted */
1930 if (tmp & SR_REQ) {
1931 phase = (tmp & PHASE_MASK);
1932 if (phase != old_phase) {
1933 old_phase = phase;
1934 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
1935 }
1936
1937 if(phase == PHASE_CMDOUT) {
1938 void *d;
1939 unsigned long count;
1940
1941 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1942 count = cmd->SCp.buffer->length;
1943 d = SGADDR(cmd->SCp.buffer);
1944 } else {
1945 count = cmd->SCp.this_residual;
1946 d = cmd->SCp.ptr;
1947 }
1948#ifdef REAL_DMA
1949 /* this command setup for dma yet? */
1950 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
1951 != cmd))
1952 {
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001953 if (cmd->request->cmd_type == REQ_TYPE_FS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 sun3scsi_dma_setup(d, count,
1955 rq_data_dir(cmd->request));
1956 sun3_dma_setup_done = cmd;
1957 }
1958 }
1959#endif
1960#ifdef SUN3_SCSI_VME
1961 dregs->csr |= CSR_INTR;
1962#endif
1963 }
1964
1965
1966 if (sink && (phase != PHASE_MSGOUT)) {
1967 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1968
1969 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1970 ICR_ASSERT_ACK);
1971 while (NCR5380_read(STATUS_REG) & SR_REQ);
1972 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1973 ICR_ASSERT_ATN);
1974 sink = 0;
1975 continue;
1976 }
1977
1978 switch (phase) {
1979 case PHASE_DATAOUT:
1980#if (NDEBUG & NDEBUG_NO_DATAOUT)
1981 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
1982 "aborted\n", HOSTNO);
1983 sink = 1;
1984 do_abort(instance);
1985 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04001986 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 return;
1988#endif
1989 case PHASE_DATAIN:
1990 /*
1991 * If there is no room left in the current buffer in the
1992 * scatter-gather list, move onto the next one.
1993 */
1994 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1995 ++cmd->SCp.buffer;
1996 --cmd->SCp.buffers_residual;
1997 cmd->SCp.this_residual = cmd->SCp.buffer->length;
1998 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2000 HOSTNO, cmd->SCp.this_residual,
2001 cmd->SCp.buffers_residual);
2002 }
2003
2004 /*
2005 * The preferred transfer method is going to be
2006 * PSEUDO-DMA for systems that are strictly PIO,
2007 * since we can let the hardware do the handshaking.
2008 *
2009 * For this to work, we need to know the transfersize
2010 * ahead of time, since the pseudo-DMA code will sit
2011 * in an unconditional loop.
2012 */
2013
2014/* ++roman: I suggest, this should be
2015 * #if def(REAL_DMA)
2016 * instead of leaving REAL_DMA out.
2017 */
2018
2019#if defined(REAL_DMA)
2020// if (!cmd->device->borken &&
2021 if((transfersize =
2022 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2023 len = transfersize;
2024 cmd->SCp.phase = phase;
2025
2026 if (NCR5380_transfer_dma(instance, &phase,
2027 &len, (unsigned char **) &cmd->SCp.ptr)) {
2028 /*
2029 * If the watchdog timer fires, all future
2030 * accesses to this device will use the
2031 * polled-IO. */
2032 printk(KERN_NOTICE "scsi%d: switching target %d "
2033 "lun %d to slow handshake\n", HOSTNO,
2034 cmd->device->id, cmd->device->lun);
2035 cmd->device->borken = 1;
2036 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2037 ICR_ASSERT_ATN);
2038 sink = 1;
2039 do_abort(instance);
2040 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002041 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 /* XXX - need to source or sink data here, as appropriate */
2043 } else {
2044#ifdef REAL_DMA
2045 /* ++roman: When using real DMA,
2046 * information_transfer() should return after
2047 * starting DMA since it has nothing more to
2048 * do.
2049 */
2050 return;
2051#else
2052 cmd->SCp.this_residual -= transfersize - len;
2053#endif
2054 }
2055 } else
2056#endif /* defined(REAL_DMA) */
2057 NCR5380_transfer_pio(instance, &phase,
2058 (int *) &cmd->SCp.this_residual, (unsigned char **)
2059 &cmd->SCp.ptr);
2060#ifdef REAL_DMA
2061 /* if we had intended to dma that command clear it */
2062 if(sun3_dma_setup_done == cmd)
2063 sun3_dma_setup_done = NULL;
2064#endif
2065
2066 break;
2067 case PHASE_MSGIN:
2068 len = 1;
2069 data = &tmp;
2070 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2071 NCR5380_transfer_pio(instance, &phase, &len, &data);
2072 cmd->SCp.Message = tmp;
2073
2074 switch (tmp) {
2075 /*
2076 * Linking lets us reduce the time required to get the
2077 * next command out to the device, hopefully this will
2078 * mean we don't waste another revolution due to the delays
2079 * required by ARBITRATION and another SELECTION.
2080 *
2081 * In the current implementation proposal, low level drivers
2082 * merely have to start the next command, pointed to by
2083 * next_link, done() is called as with unlinked commands.
2084 */
2085#ifdef LINKED
2086 case LINKED_CMD_COMPLETE:
2087 case LINKED_FLG_CMD_COMPLETE:
2088 /* Accept message by clearing ACK */
2089 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2090
2091 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2092 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2093
2094 /* Enable reselect interrupts */
2095 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2096 /*
2097 * Sanity check : A linked command should only terminate
2098 * with one of these messages if there are more linked
2099 * commands available.
2100 */
2101
2102 if (!cmd->next_link) {
2103 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2104 "linked command complete, no next_link\n",
2105 HOSTNO, cmd->device->id, cmd->device->lun);
2106 sink = 1;
2107 do_abort (instance);
2108 return;
2109 }
2110
2111 initialize_SCp(cmd->next_link);
2112 /* The next command is still part of this process; copy it
2113 * and don't free it! */
2114 cmd->next_link->tag = cmd->tag;
2115 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2116 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2117 "done, calling scsi_done().\n",
2118 HOSTNO, cmd->device->id, cmd->device->lun);
2119#ifdef NCR5380_STATS
2120 collect_stats(hostdata, cmd);
2121#endif
2122 cmd->scsi_done(cmd);
2123 cmd = hostdata->connected;
2124 break;
2125#endif /* def LINKED */
2126 case ABORT:
2127 case COMMAND_COMPLETE:
2128 /* Accept message by clearing ACK */
2129 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2130 hostdata->connected = NULL;
2131 QU_PRINTK("scsi%d: command for target %d, lun %d "
2132 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2133#ifdef SUPPORT_TAGS
2134 cmd_free_tag( cmd );
2135 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2136 /* Turn a QUEUE FULL status into BUSY, I think the
2137 * mid level cannot handle QUEUE FULL :-( (The
2138 * command is retried after BUSY). Also update our
2139 * queue size to the number of currently issued
2140 * commands now.
2141 */
2142 /* ++Andreas: the mid level code knows about
2143 QUEUE_FULL now. */
2144 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2145 TAG_PRINTK("scsi%d: target %d lun %d returned "
2146 "QUEUE_FULL after %d commands\n",
2147 HOSTNO, cmd->device->id, cmd->device->lun,
2148 ta->nr_allocated);
2149 if (ta->queue_size > ta->nr_allocated)
2150 ta->nr_allocated = ta->queue_size;
2151 }
2152#else
2153 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2154#endif
2155 /* Enable reselect interrupts */
2156 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2157
2158 /*
2159 * I'm not sure what the correct thing to do here is :
2160 *
2161 * If the command that just executed is NOT a request
2162 * sense, the obvious thing to do is to set the result
2163 * code to the values of the stored parameters.
2164 *
2165 * If it was a REQUEST SENSE command, we need some way to
2166 * differentiate between the failure code of the original
2167 * and the failure code of the REQUEST sense - the obvious
2168 * case is success, where we fall through and leave the
2169 * result code unchanged.
2170 *
2171 * The non-obvious place is where the REQUEST SENSE failed
2172 */
2173
2174 if (cmd->cmnd[0] != REQUEST_SENSE)
2175 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2176 else if (status_byte(cmd->SCp.Status) != GOOD)
2177 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2178
2179#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002180 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2181 hostdata->ses.cmd_len) {
2182 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2183 hostdata->ses.cmd_len = 0 ;
2184 }
2185
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2187 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
Boaz Harrosh28424d32007-09-10 22:37:45 +03002188 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189 ASEN_PRINTK("scsi%d: performing request sense\n",
2190 HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191 /* this is initialized from initialize_SCp
2192 cmd->SCp.buffer = NULL;
2193 cmd->SCp.buffers_residual = 0;
2194 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195
2196 local_irq_save(flags);
2197 LIST(cmd,hostdata->issue_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002198 SET_NEXT(cmd, hostdata->issue_queue);
Henne811c9362006-10-03 19:51:59 +02002199 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 local_irq_restore(flags);
2201 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2202 "issue queue\n", H_NO(cmd));
2203 } else
2204#endif /* def AUTOSENSE */
2205 {
2206#ifdef NCR5380_STATS
2207 collect_stats(hostdata, cmd);
2208#endif
2209 cmd->scsi_done(cmd);
2210 }
2211
2212 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2213 /*
2214 * Restore phase bits to 0 so an interrupted selection,
2215 * arbitration can resume.
2216 */
2217 NCR5380_write(TARGET_COMMAND_REG, 0);
2218
2219 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2220 barrier();
2221
2222 return;
2223 case MESSAGE_REJECT:
2224 /* Accept message by clearing ACK */
2225 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2226 /* Enable reselect interrupts */
2227 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2228 switch (hostdata->last_message) {
2229 case HEAD_OF_QUEUE_TAG:
2230 case ORDERED_QUEUE_TAG:
2231 case SIMPLE_QUEUE_TAG:
2232 /* The target obviously doesn't support tagged
2233 * queuing, even though it announced this ability in
2234 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2235 * clear 'tagged_supported' and lock the LUN, since
2236 * the command is treated as untagged further on.
2237 */
2238 cmd->device->tagged_supported = 0;
2239 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2240 cmd->tag = TAG_NONE;
2241 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2242 "QUEUE_TAG message; tagged queuing "
2243 "disabled\n",
2244 HOSTNO, cmd->device->id, cmd->device->lun);
2245 break;
2246 }
2247 break;
2248 case DISCONNECT:
2249 /* Accept message by clearing ACK */
2250 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2251 local_irq_save(flags);
2252 cmd->device->disconnect = 1;
2253 LIST(cmd,hostdata->disconnected_queue);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002254 SET_NEXT(cmd, hostdata->disconnected_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 hostdata->connected = NULL;
2256 hostdata->disconnected_queue = cmd;
2257 local_irq_restore(flags);
2258 QU_PRINTK("scsi%d: command for target %d lun %d was "
2259 "moved from connected to the "
2260 "disconnected_queue\n", HOSTNO,
2261 cmd->device->id, cmd->device->lun);
2262 /*
2263 * Restore phase bits to 0 so an interrupted selection,
2264 * arbitration can resume.
2265 */
2266 NCR5380_write(TARGET_COMMAND_REG, 0);
2267
2268 /* Enable reselect interrupts */
2269 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2270 /* Wait for bus free to avoid nasty timeouts */
2271 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2272 barrier();
2273#ifdef SUN3_SCSI_VME
2274 dregs->csr |= CSR_DMA_ENABLE;
2275#endif
2276 return;
2277 /*
2278 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2279 * operation, in violation of the SCSI spec so we can safely
2280 * ignore SAVE/RESTORE pointers calls.
2281 *
2282 * Unfortunately, some disks violate the SCSI spec and
2283 * don't issue the required SAVE_POINTERS message before
2284 * disconnecting, and we have to break spec to remain
2285 * compatible.
2286 */
2287 case SAVE_POINTERS:
2288 case RESTORE_POINTERS:
2289 /* Accept message by clearing ACK */
2290 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2291 /* Enable reselect interrupts */
2292 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2293 break;
2294 case EXTENDED_MESSAGE:
2295/*
2296 * Extended messages are sent in the following format :
2297 * Byte
2298 * 0 EXTENDED_MESSAGE == 1
2299 * 1 length (includes one byte for code, doesn't
2300 * include first two bytes)
2301 * 2 code
2302 * 3..length+1 arguments
2303 *
2304 * Start the extended message buffer with the EXTENDED_MESSAGE
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002305 * byte, since spi_print_msg() wants the whole thing.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 */
2307 extended_msg[0] = EXTENDED_MESSAGE;
2308 /* Accept first byte by clearing ACK */
2309 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2310
2311 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2312
2313 len = 2;
2314 data = extended_msg + 1;
2315 phase = PHASE_MSGIN;
2316 NCR5380_transfer_pio(instance, &phase, &len, &data);
2317 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2318 (int)extended_msg[1], (int)extended_msg[2]);
2319
2320 if (!len && extended_msg[1] <=
2321 (sizeof (extended_msg) - 1)) {
2322 /* Accept third byte by clearing ACK */
2323 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2324 len = extended_msg[1] - 1;
2325 data = extended_msg + 3;
2326 phase = PHASE_MSGIN;
2327
2328 NCR5380_transfer_pio(instance, &phase, &len, &data);
2329 EXT_PRINTK("scsi%d: message received, residual %d\n",
2330 HOSTNO, len);
2331
2332 switch (extended_msg[2]) {
2333 case EXTENDED_SDTR:
2334 case EXTENDED_WDTR:
2335 case EXTENDED_MODIFY_DATA_POINTER:
2336 case EXTENDED_EXTENDED_IDENTIFY:
2337 tmp = 0;
2338 }
2339 } else if (len) {
2340 printk(KERN_NOTICE "scsi%d: error receiving "
2341 "extended message\n", HOSTNO);
2342 tmp = 0;
2343 } else {
2344 printk(KERN_NOTICE "scsi%d: extended message "
2345 "code %02x length %d is too long\n",
2346 HOSTNO, extended_msg[2], extended_msg[1]);
2347 tmp = 0;
2348 }
2349 /* Fall through to reject message */
2350
2351 /*
2352 * If we get something weird that we aren't expecting,
2353 * reject it.
2354 */
2355 default:
2356 if (!tmp) {
2357 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002358 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359 printk("\n");
2360 } else if (tmp != EXTENDED_MESSAGE)
2361 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2362 "message %02x from target %d, lun %d\n",
2363 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2364 else
2365 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2366 "extended message "
2367 "code %02x, length %d from target %d, lun %d\n",
2368 HOSTNO, extended_msg[1], extended_msg[0],
2369 cmd->device->id, cmd->device->lun);
2370
2371
2372 msgout = MESSAGE_REJECT;
2373 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2374 ICR_ASSERT_ATN);
2375 break;
2376 } /* switch (tmp) */
2377 break;
2378 case PHASE_MSGOUT:
2379 len = 1;
2380 data = &msgout;
2381 hostdata->last_message = msgout;
2382 NCR5380_transfer_pio(instance, &phase, &len, &data);
2383 if (msgout == ABORT) {
2384#ifdef SUPPORT_TAGS
2385 cmd_free_tag( cmd );
2386#else
2387 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2388#endif
2389 hostdata->connected = NULL;
2390 cmd->result = DID_ERROR << 16;
2391#ifdef NCR5380_STATS
2392 collect_stats(hostdata, cmd);
2393#endif
2394 cmd->scsi_done(cmd);
2395 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2396 return;
2397 }
2398 msgout = NOP;
2399 break;
2400 case PHASE_CMDOUT:
2401 len = cmd->cmd_len;
2402 data = cmd->cmnd;
2403 /*
2404 * XXX for performance reasons, on machines with a
2405 * PSEUDO-DMA architecture we should probably
2406 * use the dma transfer function.
2407 */
2408 NCR5380_transfer_pio(instance, &phase, &len,
2409 &data);
2410 break;
2411 case PHASE_STATIN:
2412 len = 1;
2413 data = &tmp;
2414 NCR5380_transfer_pio(instance, &phase, &len, &data);
2415 cmd->SCp.Status = tmp;
2416 break;
2417 default:
2418 printk("scsi%d: unknown phase\n", HOSTNO);
2419 NCR_PRINT(NDEBUG_ANY);
2420 } /* switch(phase) */
2421 } /* if (tmp * SR_REQ) */
2422 } /* while (1) */
2423}
2424
2425/*
2426 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2427 *
2428 * Purpose : does reselection, initializing the instance->connected
Henne811c9362006-10-03 19:51:59 +02002429 * 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 -07002430 * nexus has been reestablished,
2431 *
2432 * Inputs : instance - this instance of the NCR5380.
2433 *
2434 */
2435
2436/* it might eventually prove necessary to do a dma setup on
2437 reselection, but it doesn't seem to be needed now -- sam */
2438
2439static void NCR5380_reselect (struct Scsi_Host *instance)
2440{
2441 SETUP_HOSTDATA(instance);
2442 unsigned char target_mask;
2443 unsigned char lun;
2444#ifdef SUPPORT_TAGS
2445 unsigned char tag;
2446#endif
2447 unsigned char msg[3];
Henne811c9362006-10-03 19:51:59 +02002448 struct scsi_cmnd *tmp = NULL, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449/* unsigned long flags; */
2450
2451 /*
2452 * Disable arbitration, etc. since the host adapter obviously
2453 * lost, and tell an interrupted NCR5380_select() to restart.
2454 */
2455
2456 NCR5380_write(MODE_REG, MR_BASE);
2457 hostdata->restart_select = 1;
2458
2459 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2460
2461 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2462
2463 /*
2464 * At this point, we have detected that our SCSI ID is on the bus,
2465 * SEL is true and BSY was false for at least one bus settle delay
2466 * (400 ns).
2467 *
2468 * We must assert BSY ourselves, until the target drops the SEL
2469 * signal.
2470 */
2471
2472 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2473
2474 while (NCR5380_read(STATUS_REG) & SR_SEL);
2475 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2476
2477 /*
2478 * Wait for target to go into MSGIN.
2479 */
2480
2481 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2482
2483#if 1
2484 // acknowledge toggle to MSGIN
2485 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2486
2487 // peek at the byte without really hitting the bus
2488 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2489#endif
2490
2491 if (!(msg[0] & 0x80)) {
2492 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002493 spi_print_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494 do_abort(instance);
2495 return;
2496 }
2497 lun = (msg[0] & 0x07);
2498
2499 /*
2500 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2501 * just reestablished, and remove it from the disconnected queue.
2502 */
2503
Henne811c9362006-10-03 19:51:59 +02002504 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002505 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2506 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2507#ifdef SUPPORT_TAGS
2508 && (tag == tmp->tag)
2509#endif
2510 ) {
2511 if (prev) {
2512 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002513 SET_NEXT(prev, NEXT(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002514 } else {
2515 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2516 hostdata->disconnected_queue = NEXT(tmp);
2517 }
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002518 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002519 break;
2520 }
2521 }
2522
2523 if (!tmp) {
2524 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2525#ifdef SUPPORT_TAGS
2526 "tag %d "
2527#endif
2528 "not in disconnected_queue.\n",
2529 HOSTNO, target_mask, lun
2530#ifdef SUPPORT_TAGS
2531 , tag
2532#endif
2533 );
2534 /*
2535 * Since we have an established nexus that we can't do anything
2536 * with, we must abort it.
2537 */
2538 do_abort(instance);
2539 return;
2540 }
2541#if 1
2542 /* engage dma setup for the command we just saw */
2543 {
2544 void *d;
2545 unsigned long count;
2546
2547 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2548 count = tmp->SCp.buffer->length;
2549 d = SGADDR(tmp->SCp.buffer);
2550 } else {
2551 count = tmp->SCp.this_residual;
2552 d = tmp->SCp.ptr;
2553 }
2554#ifdef REAL_DMA
2555 /* setup this command for dma if not already */
2556 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2557 {
2558 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2559 sun3_dma_setup_done = tmp;
2560 }
2561#endif
2562 }
2563#endif
2564
2565 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2566 /* Accept message by clearing ACK */
2567 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2568
2569#ifdef SUPPORT_TAGS
2570 /* If the phase is still MSGIN, the target wants to send some more
2571 * messages. In case it supports tagged queuing, this is probably a
2572 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2573 */
2574 tag = TAG_NONE;
2575 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2576 /* Accept previous IDENTIFY message by clearing ACK */
2577 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2578 len = 2;
2579 data = msg+1;
2580 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2581 msg[1] == SIMPLE_QUEUE_TAG)
2582 tag = msg[2];
2583 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2584 "reselection\n", HOSTNO, target_mask, lun, tag);
2585 }
2586#endif
2587
2588 hostdata->connected = tmp;
2589 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2590 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2591}
2592
2593
2594/*
Henne811c9362006-10-03 19:51:59 +02002595 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596 *
2597 * Purpose : abort a command
2598 *
Henne811c9362006-10-03 19:51:59 +02002599 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600 * host byte of the result field to, if zero DID_ABORTED is
2601 * used.
2602 *
2603 * Returns : 0 - success, -1 on failure.
2604 *
2605 * XXX - there is no way to abort the command that is currently
2606 * connected, you have to wait for it to complete. If this is
2607 * a problem, we could implement longjmp() / setjmp(), setjmp()
2608 * called where the loop started in NCR5380_main().
2609 */
2610
Henne811c9362006-10-03 19:51:59 +02002611static int NCR5380_abort(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612{
2613 struct Scsi_Host *instance = cmd->device->host;
2614 SETUP_HOSTDATA(instance);
Henne811c9362006-10-03 19:51:59 +02002615 struct scsi_cmnd *tmp, **prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616 unsigned long flags;
2617
2618 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
db9dff32005-04-03 14:53:59 -05002619 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620
2621 NCR5380_print_status (instance);
2622
2623 local_irq_save(flags);
2624
2625 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2626 NCR5380_read(BUS_AND_STATUS_REG),
2627 NCR5380_read(STATUS_REG));
2628
2629#if 1
2630/*
2631 * Case 1 : If the command is the currently executing command,
2632 * we'll set the aborted flag and return control so that
2633 * information transfer routine can exit cleanly.
2634 */
2635
2636 if (hostdata->connected == cmd) {
2637
2638 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2639/*
2640 * We should perform BSY checking, and make sure we haven't slipped
2641 * into BUS FREE.
2642 */
2643
2644/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2645/*
2646 * Since we can't change phases until we've completed the current
2647 * handshake, we have to source or sink a byte of data if the current
2648 * phase is not MSGOUT.
2649 */
2650
2651/*
2652 * Return control to the executing NCR drive so we can clear the
2653 * aborted flag and get back into our main loop.
2654 */
2655
2656 if (do_abort(instance) == 0) {
2657 hostdata->aborted = 1;
2658 hostdata->connected = NULL;
2659 cmd->result = DID_ABORT << 16;
2660#ifdef SUPPORT_TAGS
2661 cmd_free_tag( cmd );
2662#else
2663 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2664#endif
2665 local_irq_restore(flags);
2666 cmd->scsi_done(cmd);
2667 return SCSI_ABORT_SUCCESS;
2668 } else {
2669/* local_irq_restore(flags); */
2670 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2671 return SCSI_ABORT_ERROR;
2672 }
2673 }
2674#endif
2675
2676/*
2677 * Case 2 : If the command hasn't been issued yet, we simply remove it
2678 * from the issue queue.
2679 */
Henne811c9362006-10-03 19:51:59 +02002680 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2681 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2682 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 if (cmd == tmp) {
2684 REMOVE(5, *prev, tmp, NEXT(tmp));
2685 (*prev) = NEXT(tmp);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002686 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687 tmp->result = DID_ABORT << 16;
2688 local_irq_restore(flags);
2689 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2690 HOSTNO);
2691 /* Tagged queuing note: no tag to free here, hasn't been assigned
2692 * yet... */
2693 tmp->scsi_done(tmp);
2694 return SCSI_ABORT_SUCCESS;
2695 }
2696
2697/*
2698 * Case 3 : If any commands are connected, we're going to fail the abort
2699 * and let the high level SCSI driver retry at a later time or
2700 * issue a reset.
2701 *
2702 * Timeouts, and therefore aborted commands, will be highly unlikely
2703 * and handling them cleanly in this situation would make the common
2704 * case of noresets less efficient, and would pollute our code. So,
2705 * we fail.
2706 */
2707
2708 if (hostdata->connected) {
2709 local_irq_restore(flags);
2710 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2711 return SCSI_ABORT_SNOOZE;
2712 }
2713
2714/*
2715 * Case 4: If the command is currently disconnected from the bus, and
2716 * there are no connected commands, we reconnect the I_T_L or
2717 * I_T_L_Q nexus associated with it, go into message out, and send
2718 * an abort message.
2719 *
2720 * This case is especially ugly. In order to reestablish the nexus, we
2721 * need to call NCR5380_select(). The easiest way to implement this
2722 * function was to abort if the bus was busy, and let the interrupt
2723 * handler triggered on the SEL for reselect take care of lost arbitrations
2724 * where necessary, meaning interrupts need to be enabled.
2725 *
2726 * When interrupts are enabled, the queues may change - so we
2727 * can't remove it from the disconnected queue before selecting it
2728 * because that could cause a failure in hashing the nexus if that
2729 * device reselected.
2730 *
2731 * Since the queues may change, we can't use the pointers from when we
2732 * first locate it.
2733 *
2734 * So, we must first locate the command, and if NCR5380_select()
2735 * succeeds, then issue the abort, relocate the command and remove
2736 * it from the disconnected queue.
2737 */
2738
Henne811c9362006-10-03 19:51:59 +02002739 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740 tmp = NEXT(tmp))
2741 if (cmd == tmp) {
2742 local_irq_restore(flags);
2743 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2744
2745 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2746 return SCSI_ABORT_BUSY;
2747
2748 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2749
2750 do_abort (instance);
2751
2752 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002753 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2754 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2756 if (cmd == tmp) {
2757 REMOVE(5, *prev, tmp, NEXT(tmp));
2758 *prev = NEXT(tmp);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002759 SET_NEXT(tmp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760 tmp->result = DID_ABORT << 16;
2761 /* We must unlock the tag/LUN immediately here, since the
2762 * target goes to BUS FREE and doesn't send us another
2763 * message (COMMAND_COMPLETE or the like)
2764 */
2765#ifdef SUPPORT_TAGS
2766 cmd_free_tag( tmp );
2767#else
2768 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2769#endif
2770 local_irq_restore(flags);
2771 tmp->scsi_done(tmp);
2772 return SCSI_ABORT_SUCCESS;
2773 }
2774 }
2775
2776/*
2777 * Case 5 : If we reached this point, the command was not found in any of
2778 * the queues.
2779 *
2780 * We probably reached this point because of an unlikely race condition
2781 * between the command completing successfully and the abortion code,
2782 * so we won't panic, but we will notify the user in case something really
2783 * broke.
2784 */
2785
2786 local_irq_restore(flags);
Joe Perchesad361c92009-07-06 13:05:40 -07002787 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788
2789 return SCSI_ABORT_NOT_RUNNING;
2790}
2791
2792
2793/*
Henne811c9362006-10-03 19:51:59 +02002794 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002795 *
2796 * Purpose : reset the SCSI bus.
2797 *
2798 * Returns : SCSI_RESET_WAKEUP
2799 *
2800 */
2801
Henne811c9362006-10-03 19:51:59 +02002802static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803{
2804 SETUP_HOSTDATA(cmd->device->host);
2805 int i;
2806 unsigned long flags;
2807#if 1
Henne811c9362006-10-03 19:51:59 +02002808 struct scsi_cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809#endif
2810
2811
2812 NCR5380_print_status (cmd->device->host);
2813
2814 /* get in phase */
2815 NCR5380_write( TARGET_COMMAND_REG,
2816 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2817 /* assert RST */
2818 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2819 udelay (40);
2820 /* reset NCR registers */
2821 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2822 NCR5380_write( MODE_REG, MR_BASE );
2823 NCR5380_write( TARGET_COMMAND_REG, 0 );
2824 NCR5380_write( SELECT_ENABLE_REG, 0 );
2825 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2826 * through anymore ... */
2827 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2828
2829#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2830 /* XXX see below XXX */
2831
2832 /* MSch: old-style reset: actually abort all command processing here */
2833
2834 /* After the reset, there are no more connected or disconnected commands
2835 * and no busy units; to avoid problems with re-inserting the commands
2836 * into the issue_queue (via scsi_done()), the aborted commands are
2837 * remembered in local variables first.
2838 */
2839 local_irq_save(flags);
Henne811c9362006-10-03 19:51:59 +02002840 connected = (struct scsi_cmnd *)hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841 hostdata->connected = NULL;
Henne811c9362006-10-03 19:51:59 +02002842 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843 hostdata->disconnected_queue = NULL;
2844#ifdef SUPPORT_TAGS
2845 free_all_tags();
2846#endif
2847 for( i = 0; i < 8; ++i )
2848 hostdata->busy[i] = 0;
2849#ifdef REAL_DMA
2850 hostdata->dma_len = 0;
2851#endif
2852 local_irq_restore(flags);
2853
2854 /* In order to tell the mid-level code which commands were aborted,
2855 * set the command status to DID_RESET and call scsi_done() !!!
2856 * This ultimately aborts processing of these commands in the mid-level.
2857 */
2858
2859 if ((cmd = connected)) {
2860 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2861 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2862 cmd->scsi_done( cmd );
2863 }
2864
2865 for (i = 0; (cmd = disconnected_queue); ++i) {
2866 disconnected_queue = NEXT(cmd);
Geert Uytterhoevena5cb67f2011-06-06 22:52:56 +02002867 SET_NEXT(cmd, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2869 cmd->scsi_done( cmd );
2870 }
2871 if (i > 0)
2872 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2873
2874
2875 /* since all commands have been explicitly terminated, we need to tell
2876 * the midlevel code that the reset was SUCCESSFUL, and there is no
2877 * need to 'wake up' the commands by a request_sense
2878 */
2879 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2880#else /* 1 */
2881
2882 /* MSch: new-style reset handling: let the mid-level do what it can */
2883
2884 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2885 * Mid-level is supposed to requeue all commands that were active on the
2886 * various low-level queues. In fact it does this, but that's not enough
2887 * because all these commands are subject to timeout. And if a timeout
2888 * happens for any removed command, *_abort() is called but all queues
2889 * are now empty. Abort then gives up the falcon lock, which is fatal,
2890 * since the mid-level will queue more commands and must have the lock
2891 * (it's all happening inside timer interrupt handler!!).
2892 * Even worse, abort will return NOT_RUNNING for all those commands not
2893 * on any queue, so they won't be retried ...
2894 *
2895 * Conclusion: either scsi.c disables timeout for all resetted commands
2896 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2897 */
2898
2899 /* After the reset, there are no more connected or disconnected commands
2900 * and no busy units; so clear the low-level status here to avoid
2901 * conflicts when the mid-level code tries to wake up the affected
2902 * commands!
2903 */
2904
2905 if (hostdata->issue_queue)
2906 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2907 if (hostdata->connected)
2908 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2909 if (hostdata->disconnected_queue)
2910 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2911
2912 local_irq_save(flags);
2913 hostdata->issue_queue = NULL;
2914 hostdata->connected = NULL;
2915 hostdata->disconnected_queue = NULL;
2916#ifdef SUPPORT_TAGS
2917 free_all_tags();
2918#endif
2919 for( i = 0; i < 8; ++i )
2920 hostdata->busy[i] = 0;
2921#ifdef REAL_DMA
2922 hostdata->dma_len = 0;
2923#endif
2924 local_irq_restore(flags);
2925
2926 /* we did no complete reset of all commands, so a wakeup is required */
2927 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
2928#endif /* 1 */
2929}
2930
2931/* Local Variables: */
2932/* tab-width: 8 */
2933/* End: */