1 /*
2 * NCR 5380 generic driver routines. These should make it *trivial*
3 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
9 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 666-5836
13 *
14 * DISTRIBUTION RELEASE 6.
15 *
16 * For more information, please consult
17 *
18 * NCR 5380 Family
19 * SCSI Protocol Controller
20 * Databook
21 *
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
25 * 1+ (719) 578-3400
26 * 1+ (800) 334-5454
27 */
28
29 /*
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
31 * this file, too:
32 *
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
35 *
36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
37 * possible DMA transfer size should also happen for REAL_DMA. I added this
38 * in the #if statement.
39 *
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
42 *
43 * - The interrupt service routine should run main after end of DMA, too (not
44 * only after RESELECTION interrupts). Additionally, it should _not_ test
45 * for more interrupts after running main, since a DMA process may have
46 * been started and interrupts are turned on now. The new int could happen
47 * inside the execution of NCR5380_intr(), leading to recursive
48 * calls.
49 *
50 * - I've added a function merge_contiguous_buffers() that tries to
51 * merge scatter-gather buffers that are located at contiguous
52 * physical addresses and can be processed with the same DMA setup.
53 * Since most scatter-gather operations work on a page (4K) of
54 * 4 buffers (1K), in more than 90% of all cases three interrupts and
55 * DMA setup actions are saved.
56 *
57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
58 * and USLEEP, because these were messing up readability and will never be
59 * needed for Atari SCSI.
60 *
61 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
62 * stuff), and 'main' is executed in a bottom half if awoken by an
63 * interrupt.
64 *
65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
66 * constructs. In my eyes, this made the source rather unreadable, so I
67 * finally replaced that by the *_PRINTK() macros.
68 *
69 */
70
71 /*
72 * Further development / testing that should be done :
73 * 1. Test linked command handling code after Eric is ready with
74 * the high level code.
75 */
76 #include <scsi/scsi_dbg.h>
77 #include <scsi/scsi_transport_spi.h>
78
79 #if (NDEBUG & NDEBUG_LISTS)
80 #define LIST(x, y) \
81 do { \
82 printk("LINE:%d Adding %p to %p\n", \
83 __LINE__, (void*)(x), (void*)(y)); \
84 if ((x) == (y)) \
85 udelay(5); \
86 } while (0)
87 #define REMOVE(w, x, y, z) \
88 do { \
89 printk("LINE:%d Removing: %p->%p %p->%p \n", \
90 __LINE__, (void*)(w), (void*)(x), \
91 (void*)(y), (void*)(z)); \
92 if ((x) == (y)) \
93 udelay(5); \
94 } while (0)
95 #else
96 #define LIST(x,y)
97 #define REMOVE(w,x,y,z)
98 #endif
99
100 #ifndef notyet
101 #undef LINKED
102 #endif
103
104 /*
105 * Design
106 * Issues :
107 *
108 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
109 * and specifically for each board rather than each chip. This makes their
110 * adaptation to platforms like the Mac (Some of which use NCR5380's)
111 * more difficult than it has to be.
112 *
113 * Also, many of the SCSI drivers were written before the command queuing
114 * routines were implemented, meaning their implementations of queued
115 * commands were hacked on rather than designed in from the start.
116 *
117 * When I designed the Linux SCSI drivers I figured that
118 * while having two different SCSI boards in a system might be useful
119 * for debugging things, two of the same type wouldn't be used.
120 * Well, I was wrong and a number of users have mailed me about running
121 * multiple high-performance SCSI boards in a server.
122 *
123 * Finally, when I get questions from users, I have no idea what
124 * revision of my driver they are running.
125 *
126 * This driver attempts to address these problems :
127 * This is a generic 5380 driver. To use it on a different platform,
128 * one simply writes appropriate system specific macros (ie, data
129 * transfer - some PC's will use the I/O bus, 68K's must use
130 * memory mapped) and drops this file in their 'C' wrapper.
131 *
132 * As far as command queueing, two queues are maintained for
133 * each 5380 in the system - commands that haven't been issued yet,
134 * and commands that are currently executing. This means that an
135 * unlimited number of commands may be queued, letting
136 * more commands propagate from the higher driver levels giving higher
137 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
138 * allowing multiple commands to propagate all the way to a SCSI-II device
139 * while a command is already executing.
140 *
141 * To solve the multiple-boards-in-the-same-system problem,
142 * there is a separate instance structure for each instance
143 * of a 5380 in the system. So, multiple NCR5380 drivers will
144 * be able to coexist with appropriate changes to the high level
145 * SCSI code.
146 *
147 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
148 * number (updated for each public release) printed by the
149 * NCR5380_print_options command, which should be called from the
150 * wrapper detect function, so that I know what release of the driver
151 * users are using.
152 *
153 * Issues specific to the NCR5380 :
154 *
155 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
156 * piece of hardware that requires you to sit in a loop polling for
157 * the REQ signal as long as you are connected. Some devices are
158 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
159 * while doing long seek operations.
160 *
161 * The workaround for this is to keep track of devices that have
162 * disconnected. If the device hasn't disconnected, for commands that
163 * should disconnect, we do something like
164 *
165 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
166 *
167 * Some tweaking of N and M needs to be done. An algorithm based
168 * on "time to data" would give the best results as long as short time
169 * to datas (ie, on the same track) were considered, however these
170 * broken devices are the exception rather than the rule and I'd rather
171 * spend my time optimizing for the normal case.
172 *
173 * Architecture :
174 *
175 * At the heart of the design is a coroutine, NCR5380_main,
176 * which is started when not running by the interrupt handler,
177 * timer, and queue command function. It attempts to establish
178 * I_T_L or I_T_L_Q nexuses by removing the commands from the
179 * issue queue and calling NCR5380_select() if a nexus
180 * is not established.
181 *
182 * Once a nexus is established, the NCR5380_information_transfer()
183 * phase goes through the various phases as instructed by the target.
184 * if the target goes into MSG IN and sends a DISCONNECT message,
185 * the command structure is placed into the per instance disconnected
186 * queue, and NCR5380_main tries to find more work. If USLEEP
187 * was defined, and the target is idle for too long, the system
188 * will try to sleep.
189 *
190 * If a command has disconnected, eventually an interrupt will trigger,
191 * calling NCR5380_intr() which will in turn call NCR5380_reselect
192 * to reestablish a nexus. This will run main if necessary.
193 *
194 * On command termination, the done function will be called as
195 * appropriate.
196 *
197 * SCSI pointers are maintained in the SCp field of SCSI command
198 * structures, being initialized after the command is connected
199 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
200 * Note that in violation of the standard, an implicit SAVE POINTERS operation
201 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
202 */
203
204 /*
205 * Using this file :
206 * This file a skeleton Linux SCSI driver for the NCR 5380 series
207 * of chips. To use it, you write an architecture specific functions
208 * and macros and include this file in your driver.
209 *
210 * These macros control options :
211 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
212 * for commands that return with a CHECK CONDITION status.
213 *
214 * LINKED - if defined, linked commands are supported.
215 *
216 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
217 *
218 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
219 *
220 * These macros MUST be defined :
221 *
222 * NCR5380_read(register) - read from the specified register
223 *
224 * NCR5380_write(register, value) - write to the specific register
225 *
226 * Either real DMA *or* pseudo DMA may be implemented
227 * REAL functions :
228 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
229 * Note that the DMA setup functions should return the number of bytes
230 * that they were able to program the controller for.
231 *
232 * Also note that generic i386/PC versions of these macros are
233 * available as NCR5380_i386_dma_write_setup,
234 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
235 *
236 * NCR5380_dma_write_setup(instance, src, count) - initialize
237 * NCR5380_dma_read_setup(instance, dst, count) - initialize
238 * NCR5380_dma_residual(instance); - residual count
239 *
240 * PSEUDO functions :
241 * NCR5380_pwrite(instance, src, count)
242 * NCR5380_pread(instance, dst, count);
243 *
244 * If nothing specific to this implementation needs doing (ie, with external
245 * hardware), you must also define
246 *
247 * NCR5380_queue_command
248 * NCR5380_reset
249 * NCR5380_abort
250 * NCR5380_proc_info
251 *
252 * to be the global entry points into the specific driver, ie
253 * #define NCR5380_queue_command t128_queue_command.
254 *
255 * If this is not done, the routines will be defined as static functions
256 * with the NCR5380* names and the user must provide a globally
257 * accessible wrapper function.
258 *
259 * The generic driver is initialized by calling NCR5380_init(instance),
260 * after setting the appropriate host specific fields and ID. If the
261 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
262 * possible) function may be used. Before the specific driver initialization
263 * code finishes, NCR5380_print_options should be called.
264 */
265
266 static struct Scsi_Host *first_instance = NULL;
267 static struct scsi_host_template *the_template = NULL;
268
269 /* Macros ease life... :-) */
270 #define SETUP_HOSTDATA(in) \
271 struct NCR5380_hostdata *hostdata = \
272 (struct NCR5380_hostdata *)(in)->hostdata
273 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
274
275 #define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble)
276 #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
277 #define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble)
278
279 #define HOSTNO instance->host_no
280 #define H_NO(cmd) (cmd)->device->host->host_no
281
282 #ifdef SUPPORT_TAGS
283
284 /*
285 * Functions for handling tagged queuing
286 * =====================================
287 *
288 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
289 *
290 * Using consecutive numbers for the tags is no good idea in my eyes. There
291 * could be wrong re-usings if the counter (8 bit!) wraps and some early
292 * command has been preempted for a long time. My solution: a bitfield for
293 * remembering used tags.
294 *
295 * There's also the problem that each target has a certain queue size, but we
296 * cannot know it in advance :-( We just see a QUEUE_FULL status being
297 * returned. So, in this case, the driver internal queue size assumption is
298 * reduced to the number of active tags if QUEUE_FULL is returned by the
299 * target. The command is returned to the mid-level, but with status changed
300 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
301 * correctly.
302 *
303 * We're also not allowed running tagged commands as long as an untagged
304 * command is active. And REQUEST SENSE commands after a contingent allegiance
305 * condition _must_ be untagged. To keep track whether an untagged command has
306 * been issued, the host->busy array is still employed, as it is without
307 * support for tagged queuing.
308 *
309 * One could suspect that there are possible race conditions between
310 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
311 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
312 * which already guaranteed to be running at most once. It is also the only
313 * place where tags/LUNs are allocated. So no other allocation can slip
314 * between that pair, there could only happen a reselection, which can free a
315 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
316 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
317 */
318
319 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
320 #undef TAG_NONE
321 #define TAG_NONE 0xff
322
323 typedef struct {
324 DECLARE_BITMAP(allocated, MAX_TAGS);
325 int nr_allocated;
326 int queue_size;
327 } TAG_ALLOC;
328
329 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
330
331
init_tags(void)332 static void __init init_tags(void)
333 {
334 int target, lun;
335 TAG_ALLOC *ta;
336
337 if (!setup_use_tagged_queuing)
338 return;
339
340 for (target = 0; target < 8; ++target) {
341 for (lun = 0; lun < 8; ++lun) {
342 ta = &TagAlloc[target][lun];
343 bitmap_zero(ta->allocated, MAX_TAGS);
344 ta->nr_allocated = 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
348 */
349 ta->queue_size = MAX_TAGS;
350 }
351 }
352 }
353
354
355 /* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
359 * conditions.
360 */
361
is_lun_busy(Scsi_Cmnd * cmd,int should_be_tagged)362 static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged)
363 {
364 SETUP_HOSTDATA(cmd->device->host);
365
366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 return 1;
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 return 0;
371 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
372 TagAlloc[cmd->device->id][cmd->device->lun].queue_size) {
373 TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd), cmd->device->id, cmd->device->lun);
375 return 1;
376 }
377 return 0;
378 }
379
380
381 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
383 * untagged.
384 */
385
cmd_get_tag(Scsi_Cmnd * cmd,int should_be_tagged)386 static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged)
387 {
388 SETUP_HOSTDATA(cmd->device->host);
389
390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
392 */
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 cmd->tag = TAG_NONE;
396 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
397 TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun);
399 } else {
400 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
401
402 cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
403 set_bit(cmd->tag, ta->allocated);
404 ta->nr_allocated++;
405 TAG_PRINTK("scsi%d: using tag %d for target %d lun %d "
406 "(now %d tags in use)\n",
407 H_NO(cmd), cmd->tag, cmd->device->id,
408 cmd->device->lun, ta->nr_allocated);
409 }
410 }
411
412
413 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
414 * unlock the LUN.
415 */
416
cmd_free_tag(Scsi_Cmnd * cmd)417 static void cmd_free_tag(Scsi_Cmnd *cmd)
418 {
419 SETUP_HOSTDATA(cmd->device->host);
420
421 if (cmd->tag == TAG_NONE) {
422 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
423 TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n",
424 H_NO(cmd), cmd->device->id, cmd->device->lun);
425 } else if (cmd->tag >= MAX_TAGS) {
426 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
427 H_NO(cmd), cmd->tag);
428 } else {
429 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
430 clear_bit(cmd->tag, ta->allocated);
431 ta->nr_allocated--;
432 TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n",
433 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun);
434 }
435 }
436
437
free_all_tags(void)438 static void free_all_tags(void)
439 {
440 int target, lun;
441 TAG_ALLOC *ta;
442
443 if (!setup_use_tagged_queuing)
444 return;
445
446 for (target = 0; target < 8; ++target) {
447 for (lun = 0; lun < 8; ++lun) {
448 ta = &TagAlloc[target][lun];
449 bitmap_zero(ta->allocated, MAX_TAGS);
450 ta->nr_allocated = 0;
451 }
452 }
453 }
454
455 #endif /* SUPPORT_TAGS */
456
457
458 /*
459 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
460 *
461 * Purpose: Try to merge several scatter-gather requests into one DMA
462 * transfer. This is possible if the scatter buffers lie on
463 * physical contiguous addresses.
464 *
465 * Parameters: Scsi_Cmnd *cmd
466 * The command to work on. The first scatter buffer's data are
467 * assumed to be already transfered into ptr/this_residual.
468 */
469
merge_contiguous_buffers(Scsi_Cmnd * cmd)470 static void merge_contiguous_buffers(Scsi_Cmnd *cmd)
471 {
472 unsigned long endaddr;
473 #if (NDEBUG & NDEBUG_MERGING)
474 unsigned long oldlen = cmd->SCp.this_residual;
475 int cnt = 1;
476 #endif
477
478 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
479 cmd->SCp.buffers_residual &&
480 virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) {
481 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
482 page_address(sg_page(&cmd->SCp.buffer[1])), endaddr);
483 #if (NDEBUG & NDEBUG_MERGING)
484 ++cnt;
485 #endif
486 ++cmd->SCp.buffer;
487 --cmd->SCp.buffers_residual;
488 cmd->SCp.this_residual += cmd->SCp.buffer->length;
489 endaddr += cmd->SCp.buffer->length;
490 }
491 #if (NDEBUG & NDEBUG_MERGING)
492 if (oldlen != cmd->SCp.this_residual)
493 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
494 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
495 #endif
496 }
497
498 /*
499 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
500 *
501 * Purpose : initialize the saved data pointers for cmd to point to the
502 * start of the buffer.
503 *
504 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
505 */
506
initialize_SCp(Scsi_Cmnd * cmd)507 static inline void initialize_SCp(Scsi_Cmnd *cmd)
508 {
509 /*
510 * Initialize the Scsi Pointer field so that all of the commands in the
511 * various queues are valid.
512 */
513
514 if (scsi_bufflen(cmd)) {
515 cmd->SCp.buffer = scsi_sglist(cmd);
516 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
517 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
518 cmd->SCp.this_residual = cmd->SCp.buffer->length;
519 /* ++roman: Try to merge some scatter-buffers if they are at
520 * contiguous physical addresses.
521 */
522 merge_contiguous_buffers(cmd);
523 } else {
524 cmd->SCp.buffer = NULL;
525 cmd->SCp.buffers_residual = 0;
526 cmd->SCp.ptr = NULL;
527 cmd->SCp.this_residual = 0;
528 }
529 }
530
531 #include <linux/delay.h>
532
533 #if NDEBUG
534 static struct {
535 unsigned char mask;
536 const char *name;
537 } signals[] = {
538 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
539 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
540 { SR_SEL, "SEL" }, {0, NULL}
541 }, basrs[] = {
542 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
543 }, icrs[] = {
544 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
545 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
546 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
547 {0, NULL}
548 }, mrs[] = {
549 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
550 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
551 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
552 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
553 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
554 {0, NULL}
555 };
556
557 /*
558 * Function : void NCR5380_print(struct Scsi_Host *instance)
559 *
560 * Purpose : print the SCSI bus signals for debugging purposes
561 *
562 * Input : instance - which NCR5380
563 */
564
NCR5380_print(struct Scsi_Host * instance)565 static void NCR5380_print(struct Scsi_Host *instance)
566 {
567 unsigned char status, data, basr, mr, icr, i;
568 unsigned long flags;
569
570 local_irq_save(flags);
571 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
572 status = NCR5380_read(STATUS_REG);
573 mr = NCR5380_read(MODE_REG);
574 icr = NCR5380_read(INITIATOR_COMMAND_REG);
575 basr = NCR5380_read(BUS_AND_STATUS_REG);
576 local_irq_restore(flags);
577 printk("STATUS_REG: %02x ", status);
578 for (i = 0; signals[i].mask; ++i)
579 if (status & signals[i].mask)
580 printk(",%s", signals[i].name);
581 printk("\nBASR: %02x ", basr);
582 for (i = 0; basrs[i].mask; ++i)
583 if (basr & basrs[i].mask)
584 printk(",%s", basrs[i].name);
585 printk("\nICR: %02x ", icr);
586 for (i = 0; icrs[i].mask; ++i)
587 if (icr & icrs[i].mask)
588 printk(",%s", icrs[i].name);
589 printk("\nMODE: %02x ", mr);
590 for (i = 0; mrs[i].mask; ++i)
591 if (mr & mrs[i].mask)
592 printk(",%s", mrs[i].name);
593 printk("\n");
594 }
595
596 static struct {
597 unsigned char value;
598 const char *name;
599 } phases[] = {
600 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
601 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
602 {PHASE_UNKNOWN, "UNKNOWN"}
603 };
604
605 /*
606 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 *
608 * Purpose : print the current SCSI phase for debugging purposes
609 *
610 * Input : instance - which NCR5380
611 */
612
NCR5380_print_phase(struct Scsi_Host * instance)613 static void NCR5380_print_phase(struct Scsi_Host *instance)
614 {
615 unsigned char status;
616 int i;
617
618 status = NCR5380_read(STATUS_REG);
619 if (!(status & SR_REQ))
620 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
621 else {
622 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
623 (phases[i].value != (status & PHASE_MASK)); ++i)
624 ;
625 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
626 }
627 }
628
629 #else /* !NDEBUG */
630
631 /* dummies... */
NCR5380_print(struct Scsi_Host * instance)632 static inline void NCR5380_print(struct Scsi_Host *instance)
633 {
634 };
NCR5380_print_phase(struct Scsi_Host * instance)635 static inline void NCR5380_print_phase(struct Scsi_Host *instance)
636 {
637 };
638
639 #endif
640
641 /*
642 * ++roman: New scheme of calling NCR5380_main()
643 *
644 * If we're not in an interrupt, we can call our main directly, it cannot be
645 * already running. Else, we queue it on a task queue, if not 'main_running'
646 * tells us that a lower level is already executing it. This way,
647 * 'main_running' needs not be protected in a special way.
648 *
649 * queue_main() is a utility function for putting our main onto the task
650 * queue, if main_running is false. It should be called only from a
651 * interrupt or bottom half.
652 */
653
654 #include <linux/workqueue.h>
655 #include <linux/interrupt.h>
656
657 static volatile int main_running;
658 static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
659
queue_main(void)660 static inline void queue_main(void)
661 {
662 if (!main_running) {
663 /* If in interrupt and NCR5380_main() not already running,
664 queue it on the 'immediate' task queue, to be processed
665 immediately after the current interrupt processing has
666 finished. */
667 schedule_work(&NCR5380_tqueue);
668 }
669 /* else: nothing to do: the running NCR5380_main() will pick up
670 any newly queued command. */
671 }
672
673
NCR5380_all_init(void)674 static inline void NCR5380_all_init(void)
675 {
676 static int done = 0;
677 if (!done) {
678 INI_PRINTK("scsi : NCR5380_all_init()\n");
679 done = 1;
680 }
681 }
682
683
684 /*
685 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
686 *
687 * Purpose : called by probe code indicating the NCR5380 driver
688 * options that were selected.
689 *
690 * Inputs : instance, pointer to this instance. Unused.
691 */
692
NCR5380_print_options(struct Scsi_Host * instance)693 static void __init NCR5380_print_options(struct Scsi_Host *instance)
694 {
695 printk(" generic options"
696 #ifdef AUTOSENSE
697 " AUTOSENSE"
698 #endif
699 #ifdef REAL_DMA
700 " REAL DMA"
701 #endif
702 #ifdef PARITY
703 " PARITY"
704 #endif
705 #ifdef SUPPORT_TAGS
706 " SCSI-2 TAGGED QUEUING"
707 #endif
708 );
709 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
710 }
711
712 /*
713 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
714 *
715 * Purpose : print commands in the various queues, called from
716 * NCR5380_abort and NCR5380_debug to aid debugging.
717 *
718 * Inputs : instance, pointer to this instance.
719 */
720
NCR5380_print_status(struct Scsi_Host * instance)721 static void NCR5380_print_status(struct Scsi_Host *instance)
722 {
723 char *pr_bfr;
724 char *start;
725 int len;
726
727 NCR_PRINT(NDEBUG_ANY);
728 NCR_PRINT_PHASE(NDEBUG_ANY);
729
730 pr_bfr = (char *)__get_free_page(GFP_ATOMIC);
731 if (!pr_bfr) {
732 printk("NCR5380_print_status: no memory for print buffer\n");
733 return;
734 }
735 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
736 pr_bfr[len] = 0;
737 printk("\n%s\n", pr_bfr);
738 free_page((unsigned long)pr_bfr);
739 }
740
741
742 /******************************************/
743 /*
744 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
745 *
746 * *buffer: I/O buffer
747 * **start: if inout == FALSE pointer into buffer where user read should start
748 * offset: current offset
749 * length: length of buffer
750 * hostno: Scsi_Host host_no
751 * inout: TRUE - user is writing; FALSE - user is reading
752 *
753 * Return the number of bytes read from or written
754 */
755
756 #undef SPRINTF
757 #define SPRINTF(fmt,args...) \
758 do { \
759 if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
760 pos += sprintf(pos, fmt , ## args); \
761 } while(0)
762 static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
763
NCR5380_proc_info(struct Scsi_Host * instance,char * buffer,char ** start,off_t offset,int length,int inout)764 static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
765 char **start, off_t offset, int length, int inout)
766 {
767 char *pos = buffer;
768 struct NCR5380_hostdata *hostdata;
769 Scsi_Cmnd *ptr;
770 unsigned long flags;
771 off_t begin = 0;
772 #define check_offset() \
773 do { \
774 if (pos - buffer < offset - begin) { \
775 begin += pos - buffer; \
776 pos = buffer; \
777 } \
778 } while (0)
779
780 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
781
782 if (inout) /* Has data been written to the file ? */
783 return -ENOSYS; /* Currently this is a no-op */
784 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
785 check_offset();
786 local_irq_save(flags);
787 SPRINTF("NCR5380: coroutine is%s running.\n",
788 main_running ? "" : "n't");
789 check_offset();
790 if (!hostdata->connected)
791 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
792 else
793 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected,
794 pos, buffer, length);
795 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
796 check_offset();
797 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
798 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
799 check_offset();
800 }
801
802 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
803 check_offset();
804 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
805 ptr = NEXT(ptr)) {
806 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
807 check_offset();
808 }
809
810 local_irq_restore(flags);
811 *start = buffer + (offset - begin);
812 if (pos - buffer < offset - begin)
813 return 0;
814 else if (pos - buffer - (offset - begin) < length)
815 return pos - buffer - (offset - begin);
816 return length;
817 }
818
lprint_Scsi_Cmnd(Scsi_Cmnd * cmd,char * pos,char * buffer,int length)819 static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
820 {
821 int i, s;
822 unsigned char *command;
823 SPRINTF("scsi%d: destination target %d, lun %d\n",
824 H_NO(cmd), cmd->device->id, cmd->device->lun);
825 SPRINTF(" command = ");
826 command = cmd->cmnd;
827 SPRINTF("%2d (0x%02x)", command[0], command[0]);
828 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
829 SPRINTF(" %02x", command[i]);
830 SPRINTF("\n");
831 return pos;
832 }
833
834
835 /*
836 * Function : void NCR5380_init (struct Scsi_Host *instance)
837 *
838 * Purpose : initializes *instance and corresponding 5380 chip.
839 *
840 * Inputs : instance - instantiation of the 5380 driver.
841 *
842 * Notes : I assume that the host, hostno, and id bits have been
843 * set correctly. I don't care about the irq and other fields.
844 *
845 */
846
NCR5380_init(struct Scsi_Host * instance,int flags)847 static int NCR5380_init(struct Scsi_Host *instance, int flags)
848 {
849 int i;
850 SETUP_HOSTDATA(instance);
851
852 NCR5380_all_init();
853
854 hostdata->aborted = 0;
855 hostdata->id_mask = 1 << instance->this_id;
856 hostdata->id_higher_mask = 0;
857 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
858 if (i > hostdata->id_mask)
859 hostdata->id_higher_mask |= i;
860 for (i = 0; i < 8; ++i)
861 hostdata->busy[i] = 0;
862 #ifdef SUPPORT_TAGS
863 init_tags();
864 #endif
865 #if defined (REAL_DMA)
866 hostdata->dma_len = 0;
867 #endif
868 hostdata->targets_present = 0;
869 hostdata->connected = NULL;
870 hostdata->issue_queue = NULL;
871 hostdata->disconnected_queue = NULL;
872 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
873
874 if (!the_template) {
875 the_template = instance->hostt;
876 first_instance = instance;
877 }
878
879 #ifndef AUTOSENSE
880 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
881 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
882 " without AUTOSENSE option, contingent allegiance conditions may\n"
883 " be incorrectly cleared.\n", HOSTNO);
884 #endif /* def AUTOSENSE */
885
886 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
887 NCR5380_write(MODE_REG, MR_BASE);
888 NCR5380_write(TARGET_COMMAND_REG, 0);
889 NCR5380_write(SELECT_ENABLE_REG, 0);
890
891 return 0;
892 }
893
894 /*
895 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
896 * void (*done)(Scsi_Cmnd *))
897 *
898 * Purpose : enqueues a SCSI command
899 *
900 * Inputs : cmd - SCSI command, done - function called on completion, with
901 * a pointer to the command descriptor.
902 *
903 * Returns : 0
904 *
905 * Side effects :
906 * cmd is added to the per instance issue_queue, with minor
907 * twiddling done to the host specific fields of cmd. If the
908 * main coroutine is not running, it is restarted.
909 *
910 */
911
NCR5380_queue_command(Scsi_Cmnd * cmd,void (* done)(Scsi_Cmnd *))912 static int NCR5380_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
913 {
914 SETUP_HOSTDATA(cmd->device->host);
915 Scsi_Cmnd *tmp;
916 int oldto;
917 unsigned long flags;
918
919 #if (NDEBUG & NDEBUG_NO_WRITE)
920 switch (cmd->cmnd[0]) {
921 case WRITE_6:
922 case WRITE_10:
923 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
924 H_NO(cmd));
925 cmd->result = (DID_ERROR << 16);
926 done(cmd);
927 return 0;
928 }
929 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
930
931 #ifdef NCR5380_STATS
932 # if 0
933 if (!hostdata->connected && !hostdata->issue_queue &&
934 !hostdata->disconnected_queue) {
935 hostdata->timebase = jiffies;
936 }
937 # endif
938 # ifdef NCR5380_STAT_LIMIT
939 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
940 # endif
941 switch (cmd->cmnd[0]) {
942 case WRITE:
943 case WRITE_6:
944 case WRITE_10:
945 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
946 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
947 hostdata->pendingw++;
948 break;
949 case READ:
950 case READ_6:
951 case READ_10:
952 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
953 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
954 hostdata->pendingr++;
955 break;
956 }
957 #endif
958
959 /*
960 * We use the host_scribble field as a pointer to the next command
961 * in a queue
962 */
963
964 SET_NEXT(cmd, NULL);
965 cmd->scsi_done = done;
966
967 cmd->result = 0;
968
969 /*
970 * Insert the cmd into the issue queue. Note that REQUEST SENSE
971 * commands are added to the head of the queue since any command will
972 * clear the contingent allegiance condition that exists and the
973 * sense data is only guaranteed to be valid while the condition exists.
974 */
975
976 local_irq_save(flags);
977 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
978 * Otherwise a running NCR5380_main may steal the lock.
979 * Lock before actually inserting due to fairness reasons explained in
980 * atari_scsi.c. If we insert first, then it's impossible for this driver
981 * to release the lock.
982 * Stop timer for this command while waiting for the lock, or timeouts
983 * may happen (and they really do), and it's no good if the command doesn't
984 * appear in any of the queues.
985 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
986 * because also a timer int can trigger an abort or reset, which would
987 * alter queues and touch the lock.
988 */
989 if (!IS_A_TT()) {
990 /* perhaps stop command timer here */
991 falcon_get_lock();
992 /* perhaps restart command timer here */
993 }
994 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
995 LIST(cmd, hostdata->issue_queue);
996 SET_NEXT(cmd, hostdata->issue_queue);
997 hostdata->issue_queue = cmd;
998 } else {
999 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1000 NEXT(tmp); tmp = NEXT(tmp))
1001 ;
1002 LIST(cmd, tmp);
1003 SET_NEXT(tmp, cmd);
1004 }
1005 local_irq_restore(flags);
1006
1007 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1008 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1009
1010 /* If queue_command() is called from an interrupt (real one or bottom
1011 * half), we let queue_main() do the job of taking care about main. If it
1012 * is already running, this is a no-op, else main will be queued.
1013 *
1014 * If we're not in an interrupt, we can call NCR5380_main()
1015 * unconditionally, because it cannot be already running.
1016 */
1017 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1018 queue_main();
1019 else
1020 NCR5380_main(NULL);
1021 return 0;
1022 }
1023
1024 /*
1025 * Function : NCR5380_main (void)
1026 *
1027 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1028 * be done on the NCR5380 host adapters in a system. Both
1029 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1030 * in case it is not running.
1031 *
1032 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1033 * reenable them. This prevents reentrancy and kernel stack overflow.
1034 */
1035
NCR5380_main(struct work_struct * work)1036 static void NCR5380_main(struct work_struct *work)
1037 {
1038 Scsi_Cmnd *tmp, *prev;
1039 struct Scsi_Host *instance = first_instance;
1040 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1041 int done;
1042 unsigned long flags;
1043
1044 /*
1045 * We run (with interrupts disabled) until we're sure that none of
1046 * the host adapters have anything that can be done, at which point
1047 * we set main_running to 0 and exit.
1048 *
1049 * Interrupts are enabled before doing various other internal
1050 * instructions, after we've decided that we need to run through
1051 * the loop again.
1052 *
1053 * this should prevent any race conditions.
1054 *
1055 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1056 * because also a timer int can trigger an abort or reset, which can
1057 * alter queues and touch the Falcon lock.
1058 */
1059
1060 /* Tell int handlers main() is now already executing. Note that
1061 no races are possible here. If an int comes in before
1062 'main_running' is set here, and queues/executes main via the
1063 task queue, it doesn't do any harm, just this instance of main
1064 won't find any work left to do. */
1065 if (main_running)
1066 return;
1067 main_running = 1;
1068
1069 local_save_flags(flags);
1070 do {
1071 local_irq_disable(); /* Freeze request queues */
1072 done = 1;
1073
1074 if (!hostdata->connected) {
1075 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO);
1076 /*
1077 * Search through the issue_queue for a command destined
1078 * for a target that's not busy.
1079 */
1080 #if (NDEBUG & NDEBUG_LISTS)
1081 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1082 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1083 ;
1084 /*printk("%p ", tmp);*/
1085 if ((tmp == prev) && tmp)
1086 printk(" LOOP\n");
1087 /* else printk("\n"); */
1088 #endif
1089 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1090 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
1091
1092 #if (NDEBUG & NDEBUG_LISTS)
1093 if (prev != tmp)
1094 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1095 tmp, tmp->device->id, hostdata->busy[tmp->device->id],
1096 tmp->device->lun);
1097 #endif
1098 /* When we find one, remove it from the issue queue. */
1099 /* ++guenther: possible race with Falcon locking */
1100 if (
1101 #ifdef SUPPORT_TAGS
1102 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1103 #else
1104 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1105 #endif
1106 ) {
1107 /* ++guenther: just to be sure, this must be atomic */
1108 local_irq_disable();
1109 if (prev) {
1110 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1111 SET_NEXT(prev, NEXT(tmp));
1112 } else {
1113 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1114 hostdata->issue_queue = NEXT(tmp);
1115 }
1116 SET_NEXT(tmp, NULL);
1117 falcon_dont_release++;
1118
1119 /* reenable interrupts after finding one */
1120 local_irq_restore(flags);
1121
1122 /*
1123 * Attempt to establish an I_T_L nexus here.
1124 * On success, instance->hostdata->connected is set.
1125 * On failure, we must add the command back to the
1126 * issue queue so we can keep trying.
1127 */
1128 MAIN_PRINTK("scsi%d: main(): command for target %d "
1129 "lun %d removed from issue_queue\n",
1130 HOSTNO, tmp->device->id, tmp->device->lun);
1131 /*
1132 * REQUEST SENSE commands are issued without tagged
1133 * queueing, even on SCSI-II devices because the
1134 * contingent allegiance condition exists for the
1135 * entire unit.
1136 */
1137 /* ++roman: ...and the standard also requires that
1138 * REQUEST SENSE command are untagged.
1139 */
1140
1141 #ifdef SUPPORT_TAGS
1142 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1143 #endif
1144 if (!NCR5380_select(instance, tmp,
1145 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1146 TAG_NEXT)) {
1147 falcon_dont_release--;
1148 /* release if target did not response! */
1149 falcon_release_lock_if_possible(hostdata);
1150 break;
1151 } else {
1152 local_irq_disable();
1153 LIST(tmp, hostdata->issue_queue);
1154 SET_NEXT(tmp, hostdata->issue_queue);
1155 hostdata->issue_queue = tmp;
1156 #ifdef SUPPORT_TAGS
1157 cmd_free_tag(tmp);
1158 #endif
1159 falcon_dont_release--;
1160 local_irq_restore(flags);
1161 MAIN_PRINTK("scsi%d: main(): select() failed, "
1162 "returned to issue_queue\n", HOSTNO);
1163 if (hostdata->connected)
1164 break;
1165 }
1166 } /* if target/lun/target queue is not busy */
1167 } /* for issue_queue */
1168 } /* if (!hostdata->connected) */
1169
1170 if (hostdata->connected
1171 #ifdef REAL_DMA
1172 && !hostdata->dma_len
1173 #endif
1174 ) {
1175 local_irq_restore(flags);
1176 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1177 HOSTNO);
1178 NCR5380_information_transfer(instance);
1179 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1180 done = 0;
1181 }
1182 } while (!done);
1183
1184 /* Better allow ints _after_ 'main_running' has been cleared, else
1185 an interrupt could believe we'll pick up the work it left for
1186 us, but we won't see it anymore here... */
1187 main_running = 0;
1188 local_irq_restore(flags);
1189 }
1190
1191
1192 #ifdef REAL_DMA
1193 /*
1194 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1195 *
1196 * Purpose : Called by interrupt handler when DMA finishes or a phase
1197 * mismatch occurs (which would finish the DMA transfer).
1198 *
1199 * Inputs : instance - this instance of the NCR5380.
1200 *
1201 */
1202
NCR5380_dma_complete(struct Scsi_Host * instance)1203 static void NCR5380_dma_complete(struct Scsi_Host *instance)
1204 {
1205 SETUP_HOSTDATA(instance);
1206 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1207 unsigned char **data, p;
1208 volatile int *count;
1209
1210 if (!hostdata->connected) {
1211 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1212 "no connected cmd\n", HOSTNO);
1213 return;
1214 }
1215
1216 if (atari_read_overruns) {
1217 p = hostdata->connected->SCp.phase;
1218 if (p & SR_IO) {
1219 udelay(10);
1220 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1221 (BASR_PHASE_MATCH|BASR_ACK)) ==
1222 (BASR_PHASE_MATCH|BASR_ACK)) {
1223 saved_data = NCR5380_read(INPUT_DATA_REG);
1224 overrun = 1;
1225 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
1226 }
1227 }
1228 }
1229
1230 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1231 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1232 NCR5380_read(STATUS_REG));
1233
1234 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1235 NCR5380_write(MODE_REG, MR_BASE);
1236 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1237
1238 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1239 hostdata->dma_len = 0;
1240
1241 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1242 count = &hostdata->connected->SCp.this_residual;
1243 *data += transfered;
1244 *count -= transfered;
1245
1246 if (atari_read_overruns) {
1247 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1248 cnt = toPIO = atari_read_overruns;
1249 if (overrun) {
1250 DMA_PRINTK("Got an input overrun, using saved byte\n");
1251 *(*data)++ = saved_data;
1252 (*count)--;
1253 cnt--;
1254 toPIO--;
1255 }
1256 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1257 NCR5380_transfer_pio(instance, &p, &cnt, data);
1258 *count -= toPIO - cnt;
1259 }
1260 }
1261 }
1262 #endif /* REAL_DMA */
1263
1264
1265 /*
1266 * Function : void NCR5380_intr (int irq)
1267 *
1268 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1269 * from the disconnected queue, and restarting NCR5380_main()
1270 * as required.
1271 *
1272 * Inputs : int irq, irq that caused this interrupt.
1273 *
1274 */
1275
NCR5380_intr(int irq,void * dev_id)1276 static irqreturn_t NCR5380_intr(int irq, void *dev_id)
1277 {
1278 struct Scsi_Host *instance = first_instance;
1279 int done = 1, handled = 0;
1280 unsigned char basr;
1281
1282 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1283
1284 /* Look for pending interrupts */
1285 basr = NCR5380_read(BUS_AND_STATUS_REG);
1286 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1287 /* dispatch to appropriate routine if found and done=0 */
1288 if (basr & BASR_IRQ) {
1289 NCR_PRINT(NDEBUG_INTR);
1290 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1291 done = 0;
1292 ENABLE_IRQ();
1293 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1294 NCR5380_reselect(instance);
1295 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1296 } else if (basr & BASR_PARITY_ERROR) {
1297 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1298 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1299 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1300 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1301 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1302 } else {
1303 /*
1304 * The rest of the interrupt conditions can occur only during a
1305 * DMA transfer
1306 */
1307
1308 #if defined(REAL_DMA)
1309 /*
1310 * We should only get PHASE MISMATCH and EOP interrupts if we have
1311 * DMA enabled, so do a sanity check based on the current setting
1312 * of the MODE register.
1313 */
1314
1315 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1316 ((basr & BASR_END_DMA_TRANSFER) ||
1317 !(basr & BASR_PHASE_MATCH))) {
1318
1319 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1320 NCR5380_dma_complete( instance );
1321 done = 0;
1322 ENABLE_IRQ();
1323 } else
1324 #endif /* REAL_DMA */
1325 {
1326 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1327 if (basr & BASR_PHASE_MATCH)
1328 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1329 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1330 HOSTNO, basr, NCR5380_read(MODE_REG),
1331 NCR5380_read(STATUS_REG));
1332 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1333 }
1334 } /* if !(SELECTION || PARITY) */
1335 handled = 1;
1336 } /* BASR & IRQ */ else {
1337 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1338 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1339 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1340 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1341 }
1342
1343 if (!done) {
1344 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1345 /* Put a call to NCR5380_main() on the queue... */
1346 queue_main();
1347 }
1348 return IRQ_RETVAL(handled);
1349 }
1350
1351 #ifdef NCR5380_STATS
collect_stats(struct NCR5380_hostdata * hostdata,Scsi_Cmnd * cmd)1352 static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
1353 {
1354 # ifdef NCR5380_STAT_LIMIT
1355 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
1356 # endif
1357 switch (cmd->cmnd[0]) {
1358 case WRITE:
1359 case WRITE_6:
1360 case WRITE_10:
1361 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1362 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
1363 hostdata->pendingw--;
1364 break;
1365 case READ:
1366 case READ_6:
1367 case READ_10:
1368 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1369 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
1370 hostdata->pendingr--;
1371 break;
1372 }
1373 }
1374 #endif
1375
1376 /*
1377 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
1378 * int tag);
1379 *
1380 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1381 * including ARBITRATION, SELECTION, and initial message out for
1382 * IDENTIFY and queue messages.
1383 *
1384 * Inputs : instance - instantiation of the 5380 driver on which this
1385 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1386 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1387 * the command that is presently connected.
1388 *
1389 * Returns : -1 if selection could not execute for some reason,
1390 * 0 if selection succeeded or failed because the target
1391 * did not respond.
1392 *
1393 * Side effects :
1394 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1395 * with registers as they should have been on entry - ie
1396 * SELECT_ENABLE will be set appropriately, the NCR5380
1397 * will cease to drive any SCSI bus signals.
1398 *
1399 * If successful : I_T_L or I_T_L_Q nexus will be established,
1400 * instance->connected will be set to cmd.
1401 * SELECT interrupt will be disabled.
1402 *
1403 * If failed (no target) : cmd->scsi_done() will be called, and the
1404 * cmd->result host byte set to DID_BAD_TARGET.
1405 */
1406
NCR5380_select(struct Scsi_Host * instance,Scsi_Cmnd * cmd,int tag)1407 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
1408 {
1409 SETUP_HOSTDATA(instance);
1410 unsigned char tmp[3], phase;
1411 unsigned char *data;
1412 int len;
1413 unsigned long timeout;
1414 unsigned long flags;
1415
1416 hostdata->restart_select = 0;
1417 NCR_PRINT(NDEBUG_ARBITRATION);
1418 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1419 instance->this_id);
1420
1421 /*
1422 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1423 * data bus during SELECTION.
1424 */
1425
1426 local_irq_save(flags);
1427 if (hostdata->connected) {
1428 local_irq_restore(flags);
1429 return -1;
1430 }
1431 NCR5380_write(TARGET_COMMAND_REG, 0);
1432
1433 /*
1434 * Start arbitration.
1435 */
1436
1437 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1438 NCR5380_write(MODE_REG, MR_ARBITRATE);
1439
1440 local_irq_restore(flags);
1441
1442 /* Wait for arbitration logic to complete */
1443 #if defined(NCR_TIMEOUT)
1444 {
1445 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1446
1447 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1448 time_before(jiffies, timeout) && !hostdata->connected)
1449 ;
1450 if (time_after_eq(jiffies, timeout)) {
1451 printk("scsi : arbitration timeout at %d\n", __LINE__);
1452 NCR5380_write(MODE_REG, MR_BASE);
1453 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1454 return -1;
1455 }
1456 }
1457 #else /* NCR_TIMEOUT */
1458 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1459 !hostdata->connected)
1460 ;
1461 #endif
1462
1463 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1464
1465 if (hostdata->connected) {
1466 NCR5380_write(MODE_REG, MR_BASE);
1467 return -1;
1468 }
1469 /*
1470 * The arbitration delay is 2.2us, but this is a minimum and there is
1471 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1472 * the integral nature of udelay().
1473 *
1474 */
1475
1476 udelay(3);
1477
1478 /* Check for lost arbitration */
1479 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1480 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1481 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1482 hostdata->connected) {
1483 NCR5380_write(MODE_REG, MR_BASE);
1484 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1485 HOSTNO);
1486 return -1;
1487 }
1488
1489 /* after/during arbitration, BSY should be asserted.
1490 IBM DPES-31080 Version S31Q works now */
1491 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1492 NCR5380_write(INITIATOR_COMMAND_REG,
1493 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
1494
1495 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1496 hostdata->connected) {
1497 NCR5380_write(MODE_REG, MR_BASE);
1498 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1499 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1500 HOSTNO);
1501 return -1;
1502 }
1503
1504 /*
1505 * Again, bus clear + bus settle time is 1.2us, however, this is
1506 * a minimum so we'll udelay ceil(1.2)
1507 */
1508
1509 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1510 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1511 udelay(15);
1512 #else
1513 udelay(2);
1514 #endif
1515
1516 if (hostdata->connected) {
1517 NCR5380_write(MODE_REG, MR_BASE);
1518 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1519 return -1;
1520 }
1521
1522 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1523
1524 /*
1525 * Now that we have won arbitration, start Selection process, asserting
1526 * the host and target ID's on the SCSI bus.
1527 */
1528
1529 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1530
1531 /*
1532 * Raise ATN while SEL is true before BSY goes false from arbitration,
1533 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1534 * phase immediately after selection.
1535 */
1536
1537 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1538 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1539 NCR5380_write(MODE_REG, MR_BASE);
1540
1541 /*
1542 * Reselect interrupts must be turned off prior to the dropping of BSY,
1543 * otherwise we will trigger an interrupt.
1544 */
1545
1546 if (hostdata->connected) {
1547 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1548 return -1;
1549 }
1550
1551 NCR5380_write(SELECT_ENABLE_REG, 0);
1552
1553 /*
1554 * The initiator shall then wait at least two deskew delays and release
1555 * the BSY signal.
1556 */
1557 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1558
1559 /* Reset BSY */
1560 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1561 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1562
1563 /*
1564 * Something weird happens when we cease to drive BSY - looks
1565 * like the board/chip is letting us do another read before the
1566 * appropriate propagation delay has expired, and we're confusing
1567 * a BSY signal from ourselves as the target's response to SELECTION.
1568 *
1569 * A small delay (the 'C++' frontend breaks the pipeline with an
1570 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1571 * tighter 'C' code breaks and requires this) solves the problem -
1572 * the 1 us delay is arbitrary, and only used because this delay will
1573 * be the same on other platforms and since it works here, it should
1574 * work there.
1575 *
1576 * wingel suggests that this could be due to failing to wait
1577 * one deskew delay.
1578 */
1579
1580 udelay(1);
1581
1582 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1583
1584 /*
1585 * The SCSI specification calls for a 250 ms timeout for the actual
1586 * selection.
1587 */
1588
1589 timeout = jiffies + 25;
1590
1591 /*
1592 * XXX very interesting - we're seeing a bounce where the BSY we
1593 * asserted is being reflected / still asserted (propagation delay?)
1594 * and it's detecting as true. Sigh.
1595 */
1596
1597 #if 0
1598 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1599 * IO while SEL is true. But again, there are some disks out the in the
1600 * world that do that nevertheless. (Somebody claimed that this announces
1601 * reselection capability of the target.) So we better skip that test and
1602 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1603 */
1604
1605 while (time_before(jiffies, timeout) &&
1606 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
1607 ;
1608
1609 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1610 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1611 NCR5380_reselect(instance);
1612 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1613 HOSTNO);
1614 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1615 return -1;
1616 }
1617 #else
1618 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
1619 ;
1620 #endif
1621
1622 /*
1623 * No less than two deskew delays after the initiator detects the
1624 * BSY signal is true, it shall release the SEL signal and may
1625 * change the DATA BUS. -wingel
1626 */
1627
1628 udelay(1);
1629
1630 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1631
1632 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1633 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1634 if (hostdata->targets_present & (1 << cmd->device->id)) {
1635 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1636 if (hostdata->restart_select)
1637 printk(KERN_NOTICE "\trestart select\n");
1638 NCR_PRINT(NDEBUG_ANY);
1639 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1640 return -1;
1641 }
1642 cmd->result = DID_BAD_TARGET << 16;
1643 #ifdef NCR5380_STATS
1644 collect_stats(hostdata, cmd);
1645 #endif
1646 #ifdef SUPPORT_TAGS
1647 cmd_free_tag(cmd);
1648 #endif
1649 cmd->scsi_done(cmd);
1650 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1651 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1652 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1653 return 0;
1654 }
1655
1656 hostdata->targets_present |= (1 << cmd->device->id);
1657
1658 /*
1659 * Since we followed the SCSI spec, and raised ATN while SEL
1660 * was true but before BSY was false during selection, the information
1661 * transfer phase should be a MESSAGE OUT phase so that we can send the
1662 * IDENTIFY message.
1663 *
1664 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1665 * message (2 bytes) with a tag ID that we increment with every command
1666 * until it wraps back to 0.
1667 *
1668 * XXX - it turns out that there are some broken SCSI-II devices,
1669 * which claim to support tagged queuing but fail when more than
1670 * some number of commands are issued at once.
1671 */
1672
1673 /* Wait for start of REQ/ACK handshake */
1674 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
1675 ;
1676
1677 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1678 HOSTNO, cmd->device->id);
1679 tmp[0] = IDENTIFY(1, cmd->device->lun);
1680
1681 #ifdef SUPPORT_TAGS
1682 if (cmd->tag != TAG_NONE) {
1683 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1684 tmp[2] = cmd->tag;
1685 len = 3;
1686 } else
1687 len = 1;
1688 #else
1689 len = 1;
1690 cmd->tag = 0;
1691 #endif /* SUPPORT_TAGS */
1692
1693 /* Send message(s) */
1694 data = tmp;
1695 phase = PHASE_MSGOUT;
1696 NCR5380_transfer_pio(instance, &phase, &len, &data);
1697 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1698 /* XXX need to handle errors here */
1699 hostdata->connected = cmd;
1700 #ifndef SUPPORT_TAGS
1701 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1702 #endif
1703
1704 initialize_SCp(cmd);
1705
1706 return 0;
1707 }
1708
1709 /*
1710 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1711 * unsigned char *phase, int *count, unsigned char **data)
1712 *
1713 * Purpose : transfers data in given phase using polled I/O
1714 *
1715 * Inputs : instance - instance of driver, *phase - pointer to
1716 * what phase is expected, *count - pointer to number of
1717 * bytes to transfer, **data - pointer to data pointer.
1718 *
1719 * Returns : -1 when different phase is entered without transferring
1720 * maximum number of bytes, 0 if all bytes are transfered or exit
1721 * is in same phase.
1722 *
1723 * Also, *phase, *count, *data are modified in place.
1724 *
1725 * XXX Note : handling for bus free may be useful.
1726 */
1727
1728 /*
1729 * Note : this code is not as quick as it could be, however it
1730 * IS 100% reliable, and for the actual data transfer where speed
1731 * counts, we will always do a pseudo DMA or DMA transfer.
1732 */
1733
NCR5380_transfer_pio(struct Scsi_Host * instance,unsigned char * phase,int * count,unsigned char ** data)1734 static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1735 unsigned char *phase, int *count,
1736 unsigned char **data)
1737 {
1738 register unsigned char p = *phase, tmp;
1739 register int c = *count;
1740 register unsigned char *d = *data;
1741
1742 /*
1743 * The NCR5380 chip will only drive the SCSI bus when the
1744 * phase specified in the appropriate bits of the TARGET COMMAND
1745 * REGISTER match the STATUS REGISTER
1746 */
1747
1748 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1749
1750 do {
1751 /*
1752 * Wait for assertion of REQ, after which the phase bits will be
1753 * valid
1754 */
1755 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1756 ;
1757
1758 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1759
1760 /* Check for phase mismatch */
1761 if ((tmp & PHASE_MASK) != p) {
1762 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1763 NCR_PRINT_PHASE(NDEBUG_PIO);
1764 break;
1765 }
1766
1767 /* Do actual transfer from SCSI bus to / from memory */
1768 if (!(p & SR_IO))
1769 NCR5380_write(OUTPUT_DATA_REG, *d);
1770 else
1771 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1772
1773 ++d;
1774
1775 /*
1776 * The SCSI standard suggests that in MSGOUT phase, the initiator
1777 * should drop ATN on the last byte of the message phase
1778 * after REQ has been asserted for the handshake but before
1779 * the initiator raises ACK.
1780 */
1781
1782 if (!(p & SR_IO)) {
1783 if (!((p & SR_MSG) && c > 1)) {
1784 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1785 NCR_PRINT(NDEBUG_PIO);
1786 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1787 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1788 } else {
1789 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1790 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1791 NCR_PRINT(NDEBUG_PIO);
1792 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1793 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1794 }
1795 } else {
1796 NCR_PRINT(NDEBUG_PIO);
1797 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1798 }
1799
1800 while (NCR5380_read(STATUS_REG) & SR_REQ)
1801 ;
1802
1803 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1804
1805 /*
1806 * We have several special cases to consider during REQ/ACK handshaking :
1807 * 1. We were in MSGOUT phase, and we are on the last byte of the
1808 * message. ATN must be dropped as ACK is dropped.
1809 *
1810 * 2. We are in a MSGIN phase, and we are on the last byte of the
1811 * message. We must exit with ACK asserted, so that the calling
1812 * code may raise ATN before dropping ACK to reject the message.
1813 *
1814 * 3. ACK and ATN are clear and the target may proceed as normal.
1815 */
1816 if (!(p == PHASE_MSGIN && c == 1)) {
1817 if (p == PHASE_MSGOUT && c > 1)
1818 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1819 else
1820 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1821 }
1822 } while (--c);
1823
1824 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1825
1826 *count = c;
1827 *data = d;
1828 tmp = NCR5380_read(STATUS_REG);
1829 /* The phase read from the bus is valid if either REQ is (already)
1830 * asserted or if ACK hasn't been released yet. The latter is the case if
1831 * we're in MSGIN and all wanted bytes have been received.
1832 */
1833 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1834 *phase = tmp & PHASE_MASK;
1835 else
1836 *phase = PHASE_UNKNOWN;
1837
1838 if (!c || (*phase == p))
1839 return 0;
1840 else
1841 return -1;
1842 }
1843
1844 /*
1845 * Function : do_abort (Scsi_Host *host)
1846 *
1847 * Purpose : abort the currently established nexus. Should only be
1848 * called from a routine which can drop into a
1849 *
1850 * Returns : 0 on success, -1 on failure.
1851 */
1852
do_abort(struct Scsi_Host * host)1853 static int do_abort(struct Scsi_Host *host)
1854 {
1855 unsigned char tmp, *msgptr, phase;
1856 int len;
1857
1858 /* Request message out phase */
1859 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1860
1861 /*
1862 * Wait for the target to indicate a valid phase by asserting
1863 * REQ. Once this happens, we'll have either a MSGOUT phase
1864 * and can immediately send the ABORT message, or we'll have some
1865 * other phase and will have to source/sink data.
1866 *
1867 * We really don't care what value was on the bus or what value
1868 * the target sees, so we just handshake.
1869 */
1870
1871 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1872 ;
1873
1874 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1875
1876 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1878 ICR_ASSERT_ACK);
1879 while (NCR5380_read(STATUS_REG) & SR_REQ)
1880 ;
1881 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1882 }
1883
1884 tmp = ABORT;
1885 msgptr = &tmp;
1886 len = 1;
1887 phase = PHASE_MSGOUT;
1888 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1889
1890 /*
1891 * If we got here, and the command completed successfully,
1892 * we're about to go into bus free state.
1893 */
1894
1895 return len ? -1 : 0;
1896 }
1897
1898 #if defined(REAL_DMA)
1899 /*
1900 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1901 * unsigned char *phase, int *count, unsigned char **data)
1902 *
1903 * Purpose : transfers data in given phase using either real
1904 * or pseudo DMA.
1905 *
1906 * Inputs : instance - instance of driver, *phase - pointer to
1907 * what phase is expected, *count - pointer to number of
1908 * bytes to transfer, **data - pointer to data pointer.
1909 *
1910 * Returns : -1 when different phase is entered without transferring
1911 * maximum number of bytes, 0 if all bytes or transfered or exit
1912 * is in same phase.
1913 *
1914 * Also, *phase, *count, *data are modified in place.
1915 *
1916 */
1917
1918
NCR5380_transfer_dma(struct Scsi_Host * instance,unsigned char * phase,int * count,unsigned char ** data)1919 static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1920 unsigned char *phase, int *count,
1921 unsigned char **data)
1922 {
1923 SETUP_HOSTDATA(instance);
1924 register int c = *count;
1925 register unsigned char p = *phase;
1926 register unsigned char *d = *data;
1927 unsigned char tmp;
1928 unsigned long flags;
1929
1930 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1931 *phase = tmp;
1932 return -1;
1933 }
1934
1935 if (atari_read_overruns && (p & SR_IO))
1936 c -= atari_read_overruns;
1937
1938 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1939 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1940 c, (p & SR_IO) ? "to" : "from", d);
1941
1942 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1943
1944 #ifdef REAL_DMA
1945 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
1946 #endif /* def REAL_DMA */
1947
1948 if (IS_A_TT()) {
1949 /* On the Medusa, it is a must to initialize the DMA before
1950 * starting the NCR. This is also the cleaner way for the TT.
1951 */
1952 local_irq_save(flags);
1953 hostdata->dma_len = (p & SR_IO) ?
1954 NCR5380_dma_read_setup(instance, d, c) :
1955 NCR5380_dma_write_setup(instance, d, c);
1956 local_irq_restore(flags);
1957 }
1958
1959 if (p & SR_IO)
1960 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1961 else {
1962 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1963 NCR5380_write(START_DMA_SEND_REG, 0);
1964 }
1965
1966 if (!IS_A_TT()) {
1967 /* On the Falcon, the DMA setup must be done after the last */
1968 /* NCR access, else the DMA setup gets trashed!
1969 */
1970 local_irq_save(flags);
1971 hostdata->dma_len = (p & SR_IO) ?
1972 NCR5380_dma_read_setup(instance, d, c) :
1973 NCR5380_dma_write_setup(instance, d, c);
1974 local_irq_restore(flags);
1975 }
1976 return 0;
1977 }
1978 #endif /* defined(REAL_DMA) */
1979
1980 /*
1981 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1982 *
1983 * Purpose : run through the various SCSI phases and do as the target
1984 * directs us to. Operates on the currently connected command,
1985 * instance->connected.
1986 *
1987 * Inputs : instance, instance for which we are doing commands
1988 *
1989 * Side effects : SCSI things happen, the disconnected queue will be
1990 * modified if a command disconnects, *instance->connected will
1991 * change.
1992 *
1993 * XXX Note : we need to watch for bus free or a reset condition here
1994 * to recover from an unexpected bus free condition.
1995 */
1996
NCR5380_information_transfer(struct Scsi_Host * instance)1997 static void NCR5380_information_transfer(struct Scsi_Host *instance)
1998 {
1999 SETUP_HOSTDATA(instance);
2000 unsigned long flags;
2001 unsigned char msgout = NOP;
2002 int sink = 0;
2003 int len;
2004 #if defined(REAL_DMA)
2005 int transfersize;
2006 #endif
2007 unsigned char *data;
2008 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2009 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
2010
2011 while (1) {
2012 tmp = NCR5380_read(STATUS_REG);
2013 /* We only have a valid SCSI phase when REQ is asserted */
2014 if (tmp & SR_REQ) {
2015 phase = (tmp & PHASE_MASK);
2016 if (phase != old_phase) {
2017 old_phase = phase;
2018 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2019 }
2020
2021 if (sink && (phase != PHASE_MSGOUT)) {
2022 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2023
2024 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2025 ICR_ASSERT_ACK);
2026 while (NCR5380_read(STATUS_REG) & SR_REQ)
2027 ;
2028 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2029 ICR_ASSERT_ATN);
2030 sink = 0;
2031 continue;
2032 }
2033
2034 switch (phase) {
2035 case PHASE_DATAOUT:
2036 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2037 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2038 "aborted\n", HOSTNO);
2039 sink = 1;
2040 do_abort(instance);
2041 cmd->result = DID_ERROR << 16;
2042 cmd->scsi_done(cmd);
2043 return;
2044 #endif
2045 case PHASE_DATAIN:
2046 /*
2047 * If there is no room left in the current buffer in the
2048 * scatter-gather list, move onto the next one.
2049 */
2050
2051 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2052 ++cmd->SCp.buffer;
2053 --cmd->SCp.buffers_residual;
2054 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2055 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
2056 /* ++roman: Try to merge some scatter-buffers if
2057 * they are at contiguous physical addresses.
2058 */
2059 merge_contiguous_buffers(cmd);
2060 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2061 HOSTNO, cmd->SCp.this_residual,
2062 cmd->SCp.buffers_residual);
2063 }
2064
2065 /*
2066 * The preferred transfer method is going to be
2067 * PSEUDO-DMA for systems that are strictly PIO,
2068 * since we can let the hardware do the handshaking.
2069 *
2070 * For this to work, we need to know the transfersize
2071 * ahead of time, since the pseudo-DMA code will sit
2072 * in an unconditional loop.
2073 */
2074
2075 /* ++roman: I suggest, this should be
2076 * #if def(REAL_DMA)
2077 * instead of leaving REAL_DMA out.
2078 */
2079
2080 #if defined(REAL_DMA)
2081 if (!cmd->device->borken &&
2082 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2083 len = transfersize;
2084 cmd->SCp.phase = phase;
2085 if (NCR5380_transfer_dma(instance, &phase,
2086 &len, (unsigned char **)&cmd->SCp.ptr)) {
2087 /*
2088 * If the watchdog timer fires, all future
2089 * accesses to this device will use the
2090 * polled-IO. */
2091 printk(KERN_NOTICE "scsi%d: switching target %d "
2092 "lun %d to slow handshake\n", HOSTNO,
2093 cmd->device->id, cmd->device->lun);
2094 cmd->device->borken = 1;
2095 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2096 ICR_ASSERT_ATN);
2097 sink = 1;
2098 do_abort(instance);
2099 cmd->result = DID_ERROR << 16;
2100 cmd->scsi_done(cmd);
2101 /* XXX - need to source or sink data here, as appropriate */
2102 } else {
2103 #ifdef REAL_DMA
2104 /* ++roman: When using real DMA,
2105 * information_transfer() should return after
2106 * starting DMA since it has nothing more to
2107 * do.
2108 */
2109 return;
2110 #else
2111 cmd->SCp.this_residual -= transfersize - len;
2112 #endif
2113 }
2114 } else
2115 #endif /* defined(REAL_DMA) */
2116 NCR5380_transfer_pio(instance, &phase,
2117 (int *)&cmd->SCp.this_residual,
2118 (unsigned char **)&cmd->SCp.ptr);
2119 break;
2120 case PHASE_MSGIN:
2121 len = 1;
2122 data = &tmp;
2123 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2124 NCR5380_transfer_pio(instance, &phase, &len, &data);
2125 cmd->SCp.Message = tmp;
2126
2127 switch (tmp) {
2128 /*
2129 * Linking lets us reduce the time required to get the
2130 * next command out to the device, hopefully this will
2131 * mean we don't waste another revolution due to the delays
2132 * required by ARBITRATION and another SELECTION.
2133 *
2134 * In the current implementation proposal, low level drivers
2135 * merely have to start the next command, pointed to by
2136 * next_link, done() is called as with unlinked commands.
2137 */
2138 #ifdef LINKED
2139 case LINKED_CMD_COMPLETE:
2140 case LINKED_FLG_CMD_COMPLETE:
2141 /* Accept message by clearing ACK */
2142 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2143
2144 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2145 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2146
2147 /* Enable reselect interrupts */
2148 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2149 /*
2150 * Sanity check : A linked command should only terminate
2151 * with one of these messages if there are more linked
2152 * commands available.
2153 */
2154
2155 if (!cmd->next_link) {
2156 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2157 "linked command complete, no next_link\n",
2158 HOSTNO, cmd->device->id, cmd->device->lun);
2159 sink = 1;
2160 do_abort(instance);
2161 return;
2162 }
2163
2164 initialize_SCp(cmd->next_link);
2165 /* The next command is still part of this process; copy it
2166 * and don't free it! */
2167 cmd->next_link->tag = cmd->tag;
2168 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2169 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2170 "done, calling scsi_done().\n",
2171 HOSTNO, cmd->device->id, cmd->device->lun);
2172 #ifdef NCR5380_STATS
2173 collect_stats(hostdata, cmd);
2174 #endif
2175 cmd->scsi_done(cmd);
2176 cmd = hostdata->connected;
2177 break;
2178 #endif /* def LINKED */
2179 case ABORT:
2180 case COMMAND_COMPLETE:
2181 /* Accept message by clearing ACK */
2182 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2183 /* ++guenther: possible race with Falcon locking */
2184 falcon_dont_release++;
2185 hostdata->connected = NULL;
2186 QU_PRINTK("scsi%d: command for target %d, lun %d "
2187 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2188 #ifdef SUPPORT_TAGS
2189 cmd_free_tag(cmd);
2190 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2191 /* Turn a QUEUE FULL status into BUSY, I think the
2192 * mid level cannot handle QUEUE FULL :-( (The
2193 * command is retried after BUSY). Also update our
2194 * queue size to the number of currently issued
2195 * commands now.
2196 */
2197 /* ++Andreas: the mid level code knows about
2198 QUEUE_FULL now. */
2199 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2200 TAG_PRINTK("scsi%d: target %d lun %d returned "
2201 "QUEUE_FULL after %d commands\n",
2202 HOSTNO, cmd->device->id, cmd->device->lun,
2203 ta->nr_allocated);
2204 if (ta->queue_size > ta->nr_allocated)
2205 ta->nr_allocated = ta->queue_size;
2206 }
2207 #else
2208 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2209 #endif
2210 /* Enable reselect interrupts */
2211 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2212
2213 /*
2214 * I'm not sure what the correct thing to do here is :
2215 *
2216 * If the command that just executed is NOT a request
2217 * sense, the obvious thing to do is to set the result
2218 * code to the values of the stored parameters.
2219 *
2220 * If it was a REQUEST SENSE command, we need some way to
2221 * differentiate between the failure code of the original
2222 * and the failure code of the REQUEST sense - the obvious
2223 * case is success, where we fall through and leave the
2224 * result code unchanged.
2225 *
2226 * The non-obvious place is where the REQUEST SENSE failed
2227 */
2228
2229 if (cmd->cmnd[0] != REQUEST_SENSE)
2230 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2231 else if (status_byte(cmd->SCp.Status) != GOOD)
2232 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2233
2234 #ifdef AUTOSENSE
2235 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2236 hostdata->ses.cmd_len) {
2237 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2238 hostdata->ses.cmd_len = 0 ;
2239 }
2240
2241 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2242 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2243 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2244
2245 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO);
2246
2247 local_irq_save(flags);
2248 LIST(cmd,hostdata->issue_queue);
2249 SET_NEXT(cmd, hostdata->issue_queue);
2250 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2251 local_irq_restore(flags);
2252 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2253 "issue queue\n", H_NO(cmd));
2254 } else
2255 #endif /* def AUTOSENSE */
2256 {
2257 #ifdef NCR5380_STATS
2258 collect_stats(hostdata, cmd);
2259 #endif
2260 cmd->scsi_done(cmd);
2261 }
2262
2263 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2264 /*
2265 * Restore phase bits to 0 so an interrupted selection,
2266 * arbitration can resume.
2267 */
2268 NCR5380_write(TARGET_COMMAND_REG, 0);
2269
2270 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2271 barrier();
2272
2273 falcon_dont_release--;
2274 /* ++roman: For Falcon SCSI, release the lock on the
2275 * ST-DMA here if no other commands are waiting on the
2276 * disconnected queue.
2277 */
2278 falcon_release_lock_if_possible(hostdata);
2279 return;
2280 case MESSAGE_REJECT:
2281 /* Accept message by clearing ACK */
2282 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2283 /* Enable reselect interrupts */
2284 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2285 switch (hostdata->last_message) {
2286 case HEAD_OF_QUEUE_TAG:
2287 case ORDERED_QUEUE_TAG:
2288 case SIMPLE_QUEUE_TAG:
2289 /* The target obviously doesn't support tagged
2290 * queuing, even though it announced this ability in
2291 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2292 * clear 'tagged_supported' and lock the LUN, since
2293 * the command is treated as untagged further on.
2294 */
2295 cmd->device->tagged_supported = 0;
2296 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2297 cmd->tag = TAG_NONE;
2298 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2299 "QUEUE_TAG message; tagged queuing "
2300 "disabled\n",
2301 HOSTNO, cmd->device->id, cmd->device->lun);
2302 break;
2303 }
2304 break;
2305 case DISCONNECT:
2306 /* Accept message by clearing ACK */
2307 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2308 local_irq_save(flags);
2309 cmd->device->disconnect = 1;
2310 LIST(cmd,hostdata->disconnected_queue);
2311 SET_NEXT(cmd, hostdata->disconnected_queue);
2312 hostdata->connected = NULL;
2313 hostdata->disconnected_queue = cmd;
2314 local_irq_restore(flags);
2315 QU_PRINTK("scsi%d: command for target %d lun %d was "
2316 "moved from connected to the "
2317 "disconnected_queue\n", HOSTNO,
2318 cmd->device->id, cmd->device->lun);
2319 /*
2320 * Restore phase bits to 0 so an interrupted selection,
2321 * arbitration can resume.
2322 */
2323 NCR5380_write(TARGET_COMMAND_REG, 0);
2324
2325 /* Enable reselect interrupts */
2326 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2327 /* Wait for bus free to avoid nasty timeouts */
2328 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2329 barrier();
2330 return;
2331 /*
2332 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2333 * operation, in violation of the SCSI spec so we can safely
2334 * ignore SAVE/RESTORE pointers calls.
2335 *
2336 * Unfortunately, some disks violate the SCSI spec and
2337 * don't issue the required SAVE_POINTERS message before
2338 * disconnecting, and we have to break spec to remain
2339 * compatible.
2340 */
2341 case SAVE_POINTERS:
2342 case RESTORE_POINTERS:
2343 /* Accept message by clearing ACK */
2344 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2345 /* Enable reselect interrupts */
2346 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2347 break;
2348 case EXTENDED_MESSAGE:
2349 /*
2350 * Extended messages are sent in the following format :
2351 * Byte
2352 * 0 EXTENDED_MESSAGE == 1
2353 * 1 length (includes one byte for code, doesn't
2354 * include first two bytes)
2355 * 2 code
2356 * 3..length+1 arguments
2357 *
2358 * Start the extended message buffer with the EXTENDED_MESSAGE
2359 * byte, since spi_print_msg() wants the whole thing.
2360 */
2361 extended_msg[0] = EXTENDED_MESSAGE;
2362 /* Accept first byte by clearing ACK */
2363 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2364
2365 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2366
2367 len = 2;
2368 data = extended_msg + 1;
2369 phase = PHASE_MSGIN;
2370 NCR5380_transfer_pio(instance, &phase, &len, &data);
2371 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2372 (int)extended_msg[1], (int)extended_msg[2]);
2373
2374 if (!len && extended_msg[1] <=
2375 (sizeof(extended_msg) - 1)) {
2376 /* Accept third byte by clearing ACK */
2377 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2378 len = extended_msg[1] - 1;
2379 data = extended_msg + 3;
2380 phase = PHASE_MSGIN;
2381
2382 NCR5380_transfer_pio(instance, &phase, &len, &data);
2383 EXT_PRINTK("scsi%d: message received, residual %d\n",
2384 HOSTNO, len);
2385
2386 switch (extended_msg[2]) {
2387 case EXTENDED_SDTR:
2388 case EXTENDED_WDTR:
2389 case EXTENDED_MODIFY_DATA_POINTER:
2390 case EXTENDED_EXTENDED_IDENTIFY:
2391 tmp = 0;
2392 }
2393 } else if (len) {
2394 printk(KERN_NOTICE "scsi%d: error receiving "
2395 "extended message\n", HOSTNO);
2396 tmp = 0;
2397 } else {
2398 printk(KERN_NOTICE "scsi%d: extended message "
2399 "code %02x length %d is too long\n",
2400 HOSTNO, extended_msg[2], extended_msg[1]);
2401 tmp = 0;
2402 }
2403 /* Fall through to reject message */
2404
2405 /*
2406 * If we get something weird that we aren't expecting,
2407 * reject it.
2408 */
2409 default:
2410 if (!tmp) {
2411 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2412 spi_print_msg(extended_msg);
2413 printk("\n");
2414 } else if (tmp != EXTENDED_MESSAGE)
2415 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2416 "message %02x from target %d, lun %d\n",
2417 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2418 else
2419 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2420 "extended message "
2421 "code %02x, length %d from target %d, lun %d\n",
2422 HOSTNO, extended_msg[1], extended_msg[0],
2423 cmd->device->id, cmd->device->lun);
2424
2425
2426 msgout = MESSAGE_REJECT;
2427 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2428 break;
2429 } /* switch (tmp) */
2430 break;
2431 case PHASE_MSGOUT:
2432 len = 1;
2433 data = &msgout;
2434 hostdata->last_message = msgout;
2435 NCR5380_transfer_pio(instance, &phase, &len, &data);
2436 if (msgout == ABORT) {
2437 #ifdef SUPPORT_TAGS
2438 cmd_free_tag(cmd);
2439 #else
2440 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2441 #endif
2442 hostdata->connected = NULL;
2443 cmd->result = DID_ERROR << 16;
2444 #ifdef NCR5380_STATS
2445 collect_stats(hostdata, cmd);
2446 #endif
2447 cmd->scsi_done(cmd);
2448 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2449 falcon_release_lock_if_possible(hostdata);
2450 return;
2451 }
2452 msgout = NOP;
2453 break;
2454 case PHASE_CMDOUT:
2455 len = cmd->cmd_len;
2456 data = cmd->cmnd;
2457 /*
2458 * XXX for performance reasons, on machines with a
2459 * PSEUDO-DMA architecture we should probably
2460 * use the dma transfer function.
2461 */
2462 NCR5380_transfer_pio(instance, &phase, &len, &data);
2463 break;
2464 case PHASE_STATIN:
2465 len = 1;
2466 data = &tmp;
2467 NCR5380_transfer_pio(instance, &phase, &len, &data);
2468 cmd->SCp.Status = tmp;
2469 break;
2470 default:
2471 printk("scsi%d: unknown phase\n", HOSTNO);
2472 NCR_PRINT(NDEBUG_ANY);
2473 } /* switch(phase) */
2474 } /* if (tmp * SR_REQ) */
2475 } /* while (1) */
2476 }
2477
2478 /*
2479 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2480 *
2481 * Purpose : does reselection, initializing the instance->connected
2482 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
2483 * nexus has been reestablished,
2484 *
2485 * Inputs : instance - this instance of the NCR5380.
2486 *
2487 */
2488
2489
NCR5380_reselect(struct Scsi_Host * instance)2490 static void NCR5380_reselect(struct Scsi_Host *instance)
2491 {
2492 SETUP_HOSTDATA(instance);
2493 unsigned char target_mask;
2494 unsigned char lun, phase;
2495 int len;
2496 #ifdef SUPPORT_TAGS
2497 unsigned char tag;
2498 #endif
2499 unsigned char msg[3];
2500 unsigned char *data;
2501 Scsi_Cmnd *tmp = NULL, *prev;
2502 /* unsigned long flags; */
2503
2504 /*
2505 * Disable arbitration, etc. since the host adapter obviously
2506 * lost, and tell an interrupted NCR5380_select() to restart.
2507 */
2508
2509 NCR5380_write(MODE_REG, MR_BASE);
2510 hostdata->restart_select = 1;
2511
2512 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2513
2514 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2515
2516 /*
2517 * At this point, we have detected that our SCSI ID is on the bus,
2518 * SEL is true and BSY was false for at least one bus settle delay
2519 * (400 ns).
2520 *
2521 * We must assert BSY ourselves, until the target drops the SEL
2522 * signal.
2523 */
2524
2525 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2526
2527 while (NCR5380_read(STATUS_REG) & SR_SEL)
2528 ;
2529 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2530
2531 /*
2532 * Wait for target to go into MSGIN.
2533 */
2534
2535 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
2536 ;
2537
2538 len = 1;
2539 data = msg;
2540 phase = PHASE_MSGIN;
2541 NCR5380_transfer_pio(instance, &phase, &len, &data);
2542
2543 if (!(msg[0] & 0x80)) {
2544 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2545 spi_print_msg(msg);
2546 do_abort(instance);
2547 return;
2548 }
2549 lun = (msg[0] & 0x07);
2550
2551 #ifdef SUPPORT_TAGS
2552 /* If the phase is still MSGIN, the target wants to send some more
2553 * messages. In case it supports tagged queuing, this is probably a
2554 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2555 */
2556 tag = TAG_NONE;
2557 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2558 /* Accept previous IDENTIFY message by clearing ACK */
2559 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2560 len = 2;
2561 data = msg + 1;
2562 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2563 msg[1] == SIMPLE_QUEUE_TAG)
2564 tag = msg[2];
2565 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2566 "reselection\n", HOSTNO, target_mask, lun, tag);
2567 }
2568 #endif
2569
2570 /*
2571 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2572 * just reestablished, and remove it from the disconnected queue.
2573 */
2574
2575 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2576 tmp; prev = tmp, tmp = NEXT(tmp)) {
2577 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2578 #ifdef SUPPORT_TAGS
2579 && (tag == tmp->tag)
2580 #endif
2581 ) {
2582 /* ++guenther: prevent race with falcon_release_lock */
2583 falcon_dont_release++;
2584 if (prev) {
2585 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2586 SET_NEXT(prev, NEXT(tmp));
2587 } else {
2588 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2589 hostdata->disconnected_queue = NEXT(tmp);
2590 }
2591 SET_NEXT(tmp, NULL);
2592 break;
2593 }
2594 }
2595
2596 if (!tmp) {
2597 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2598 #ifdef SUPPORT_TAGS
2599 "tag %d "
2600 #endif
2601 "not in disconnected_queue.\n",
2602 HOSTNO, target_mask, lun
2603 #ifdef SUPPORT_TAGS
2604 , tag
2605 #endif
2606 );
2607 /*
2608 * Since we have an established nexus that we can't do anything
2609 * with, we must abort it.
2610 */
2611 do_abort(instance);
2612 return;
2613 }
2614
2615 /* Accept message by clearing ACK */
2616 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2617
2618 hostdata->connected = tmp;
2619 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2620 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2621 falcon_dont_release--;
2622 }
2623
2624
2625 /*
2626 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2627 *
2628 * Purpose : abort a command
2629 *
2630 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2631 * host byte of the result field to, if zero DID_ABORTED is
2632 * used.
2633 *
2634 * Returns : 0 - success, -1 on failure.
2635 *
2636 * XXX - there is no way to abort the command that is currently
2637 * connected, you have to wait for it to complete. If this is
2638 * a problem, we could implement longjmp() / setjmp(), setjmp()
2639 * called where the loop started in NCR5380_main().
2640 */
2641
2642 static
NCR5380_abort(Scsi_Cmnd * cmd)2643 int NCR5380_abort(Scsi_Cmnd *cmd)
2644 {
2645 struct Scsi_Host *instance = cmd->device->host;
2646 SETUP_HOSTDATA(instance);
2647 Scsi_Cmnd *tmp, **prev;
2648 unsigned long flags;
2649
2650 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2651 scsi_print_command(cmd);
2652
2653 NCR5380_print_status(instance);
2654
2655 local_irq_save(flags);
2656
2657 if (!IS_A_TT() && !falcon_got_lock)
2658 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2659 HOSTNO);
2660
2661 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2662 NCR5380_read(BUS_AND_STATUS_REG),
2663 NCR5380_read(STATUS_REG));
2664
2665 #if 1
2666 /*
2667 * Case 1 : If the command is the currently executing command,
2668 * we'll set the aborted flag and return control so that
2669 * information transfer routine can exit cleanly.
2670 */
2671
2672 if (hostdata->connected == cmd) {
2673
2674 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2675 /*
2676 * We should perform BSY checking, and make sure we haven't slipped
2677 * into BUS FREE.
2678 */
2679
2680 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2681 /*
2682 * Since we can't change phases until we've completed the current
2683 * handshake, we have to source or sink a byte of data if the current
2684 * phase is not MSGOUT.
2685 */
2686
2687 /*
2688 * Return control to the executing NCR drive so we can clear the
2689 * aborted flag and get back into our main loop.
2690 */
2691
2692 if (do_abort(instance) == 0) {
2693 hostdata->aborted = 1;
2694 hostdata->connected = NULL;
2695 cmd->result = DID_ABORT << 16;
2696 #ifdef SUPPORT_TAGS
2697 cmd_free_tag(cmd);
2698 #else
2699 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2700 #endif
2701 local_irq_restore(flags);
2702 cmd->scsi_done(cmd);
2703 falcon_release_lock_if_possible(hostdata);
2704 return SCSI_ABORT_SUCCESS;
2705 } else {
2706 /* local_irq_restore(flags); */
2707 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2708 return SCSI_ABORT_ERROR;
2709 }
2710 }
2711 #endif
2712
2713 /*
2714 * Case 2 : If the command hasn't been issued yet, we simply remove it
2715 * from the issue queue.
2716 */
2717 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
2718 tmp = (Scsi_Cmnd *)hostdata->issue_queue;
2719 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2720 if (cmd == tmp) {
2721 REMOVE(5, *prev, tmp, NEXT(tmp));
2722 (*prev) = NEXT(tmp);
2723 SET_NEXT(tmp, NULL);
2724 tmp->result = DID_ABORT << 16;
2725 local_irq_restore(flags);
2726 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2727 HOSTNO);
2728 /* Tagged queuing note: no tag to free here, hasn't been assigned
2729 * yet... */
2730 tmp->scsi_done(tmp);
2731 falcon_release_lock_if_possible(hostdata);
2732 return SCSI_ABORT_SUCCESS;
2733 }
2734 }
2735
2736 /*
2737 * Case 3 : If any commands are connected, we're going to fail the abort
2738 * and let the high level SCSI driver retry at a later time or
2739 * issue a reset.
2740 *
2741 * Timeouts, and therefore aborted commands, will be highly unlikely
2742 * and handling them cleanly in this situation would make the common
2743 * case of noresets less efficient, and would pollute our code. So,
2744 * we fail.
2745 */
2746
2747 if (hostdata->connected) {
2748 local_irq_restore(flags);
2749 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2750 return SCSI_ABORT_SNOOZE;
2751 }
2752
2753 /*
2754 * Case 4: If the command is currently disconnected from the bus, and
2755 * there are no connected commands, we reconnect the I_T_L or
2756 * I_T_L_Q nexus associated with it, go into message out, and send
2757 * an abort message.
2758 *
2759 * This case is especially ugly. In order to reestablish the nexus, we
2760 * need to call NCR5380_select(). The easiest way to implement this
2761 * function was to abort if the bus was busy, and let the interrupt
2762 * handler triggered on the SEL for reselect take care of lost arbitrations
2763 * where necessary, meaning interrupts need to be enabled.
2764 *
2765 * When interrupts are enabled, the queues may change - so we
2766 * can't remove it from the disconnected queue before selecting it
2767 * because that could cause a failure in hashing the nexus if that
2768 * device reselected.
2769 *
2770 * Since the queues may change, we can't use the pointers from when we
2771 * first locate it.
2772 *
2773 * So, we must first locate the command, and if NCR5380_select()
2774 * succeeds, then issue the abort, relocate the command and remove
2775 * it from the disconnected queue.
2776 */
2777
2778 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2779 tmp = NEXT(tmp)) {
2780 if (cmd == tmp) {
2781 local_irq_restore(flags);
2782 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2783
2784 if (NCR5380_select(instance, cmd, (int)cmd->tag))
2785 return SCSI_ABORT_BUSY;
2786
2787 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2788
2789 do_abort(instance);
2790
2791 local_irq_save(flags);
2792 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
2793 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
2794 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2795 if (cmd == tmp) {
2796 REMOVE(5, *prev, tmp, NEXT(tmp));
2797 *prev = NEXT(tmp);
2798 SET_NEXT(tmp, NULL);
2799 tmp->result = DID_ABORT << 16;
2800 /* We must unlock the tag/LUN immediately here, since the
2801 * target goes to BUS FREE and doesn't send us another
2802 * message (COMMAND_COMPLETE or the like)
2803 */
2804 #ifdef SUPPORT_TAGS
2805 cmd_free_tag(tmp);
2806 #else
2807 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2808 #endif
2809 local_irq_restore(flags);
2810 tmp->scsi_done(tmp);
2811 falcon_release_lock_if_possible(hostdata);
2812 return SCSI_ABORT_SUCCESS;
2813 }
2814 }
2815 }
2816 }
2817
2818 /*
2819 * Case 5 : If we reached this point, the command was not found in any of
2820 * the queues.
2821 *
2822 * We probably reached this point because of an unlikely race condition
2823 * between the command completing successfully and the abortion code,
2824 * so we won't panic, but we will notify the user in case something really
2825 * broke.
2826 */
2827
2828 local_irq_restore(flags);
2829 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2830 KERN_INFO " before abortion\n", HOSTNO);
2831
2832 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2833 * possible at all) At least, we should check if the lock could be
2834 * released after the abort, in case it is kept due to some bug.
2835 */
2836 falcon_release_lock_if_possible(hostdata);
2837
2838 return SCSI_ABORT_NOT_RUNNING;
2839 }
2840
2841
2842 /*
2843 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
2844 *
2845 * Purpose : reset the SCSI bus.
2846 *
2847 * Returns : SCSI_RESET_WAKEUP
2848 *
2849 */
2850
NCR5380_bus_reset(Scsi_Cmnd * cmd)2851 static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
2852 {
2853 SETUP_HOSTDATA(cmd->device->host);
2854 int i;
2855 unsigned long flags;
2856 #if 1
2857 Scsi_Cmnd *connected, *disconnected_queue;
2858 #endif
2859
2860 if (!IS_A_TT() && !falcon_got_lock)
2861 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2862 H_NO(cmd));
2863
2864 NCR5380_print_status(cmd->device->host);
2865
2866 /* get in phase */
2867 NCR5380_write(TARGET_COMMAND_REG,
2868 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
2869 /* assert RST */
2870 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
2871 udelay(40);
2872 /* reset NCR registers */
2873 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2874 NCR5380_write(MODE_REG, MR_BASE);
2875 NCR5380_write(TARGET_COMMAND_REG, 0);
2876 NCR5380_write(SELECT_ENABLE_REG, 0);
2877 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2878 * through anymore ... */
2879 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
2880
2881 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2882 /* XXX see below XXX */
2883
2884 /* MSch: old-style reset: actually abort all command processing here */
2885
2886 /* After the reset, there are no more connected or disconnected commands
2887 * and no busy units; to avoid problems with re-inserting the commands
2888 * into the issue_queue (via scsi_done()), the aborted commands are
2889 * remembered in local variables first.
2890 */
2891 local_irq_save(flags);
2892 connected = (Scsi_Cmnd *)hostdata->connected;
2893 hostdata->connected = NULL;
2894 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2895 hostdata->disconnected_queue = NULL;
2896 #ifdef SUPPORT_TAGS
2897 free_all_tags();
2898 #endif
2899 for (i = 0; i < 8; ++i)
2900 hostdata->busy[i] = 0;
2901 #ifdef REAL_DMA
2902 hostdata->dma_len = 0;
2903 #endif
2904 local_irq_restore(flags);
2905
2906 /* In order to tell the mid-level code which commands were aborted,
2907 * set the command status to DID_RESET and call scsi_done() !!!
2908 * This ultimately aborts processing of these commands in the mid-level.
2909 */
2910
2911 if ((cmd = connected)) {
2912 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2913 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2914 cmd->scsi_done(cmd);
2915 }
2916
2917 for (i = 0; (cmd = disconnected_queue); ++i) {
2918 disconnected_queue = NEXT(cmd);
2919 SET_NEXT(cmd, NULL);
2920 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2921 cmd->scsi_done(cmd);
2922 }
2923 if (i > 0)
2924 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2925
2926 /* The Falcon lock should be released after a reset...
2927 */
2928 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2929 * unlocking and enabling dma interrupt.
2930 */
2931 /* falcon_release_lock_if_possible( hostdata );*/
2932
2933 /* since all commands have been explicitly terminated, we need to tell
2934 * the midlevel code that the reset was SUCCESSFUL, and there is no
2935 * need to 'wake up' the commands by a request_sense
2936 */
2937 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2938 #else /* 1 */
2939
2940 /* MSch: new-style reset handling: let the mid-level do what it can */
2941
2942 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2943 * Mid-level is supposed to requeue all commands that were active on the
2944 * various low-level queues. In fact it does this, but that's not enough
2945 * because all these commands are subject to timeout. And if a timeout
2946 * happens for any removed command, *_abort() is called but all queues
2947 * are now empty. Abort then gives up the falcon lock, which is fatal,
2948 * since the mid-level will queue more commands and must have the lock
2949 * (it's all happening inside timer interrupt handler!!).
2950 * Even worse, abort will return NOT_RUNNING for all those commands not
2951 * on any queue, so they won't be retried ...
2952 *
2953 * Conclusion: either scsi.c disables timeout for all resetted commands
2954 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2955 */
2956
2957 /* After the reset, there are no more connected or disconnected commands
2958 * and no busy units; so clear the low-level status here to avoid
2959 * conflicts when the mid-level code tries to wake up the affected
2960 * commands!
2961 */
2962
2963 if (hostdata->issue_queue)
2964 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2965 if (hostdata->connected)
2966 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2967 if (hostdata->disconnected_queue)
2968 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2969
2970 local_irq_save(flags);
2971 hostdata->issue_queue = NULL;
2972 hostdata->connected = NULL;
2973 hostdata->disconnected_queue = NULL;
2974 #ifdef SUPPORT_TAGS
2975 free_all_tags();
2976 #endif
2977 for (i = 0; i < 8; ++i)
2978 hostdata->busy[i] = 0;
2979 #ifdef REAL_DMA
2980 hostdata->dma_len = 0;
2981 #endif
2982 local_irq_restore(flags);
2983
2984 /* we did no complete reset of all commands, so a wakeup is required */
2985 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
2986 #endif /* 1 */
2987 }
2988