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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / scsi / esp_scsi.c
blob394ed9e79fd489bf355879e0a6dc76bfca59b562
1 /* esp_scsi.c: ESP SCSI driver.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/slab.h>
9 #include <linux/delay.h>
10 #include <linux/list.h>
11 #include <linux/completion.h>
12 #include <linux/kallsyms.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/init.h>
16 #include <linux/irqreturn.h>
17
18 #include <asm/irq.h>
19 #include <asm/io.h>
20 #include <asm/dma.h>
21
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_host.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_device.h>
26 #include <scsi/scsi_tcq.h>
27 #include <scsi/scsi_dbg.h>
28 #include <scsi/scsi_transport_spi.h>
29
30 #include "esp_scsi.h"
31
32 #define DRV_MODULE_NAME "esp"
33 #define PFX DRV_MODULE_NAME ": "
34 #define DRV_VERSION "2.000"
35 #define DRV_MODULE_RELDATE "April 19, 2007"
36
37 /* SCSI bus reset settle time in seconds. */
38 static int esp_bus_reset_settle = 3;
39
40 static u32 esp_debug;
41 #define ESP_DEBUG_INTR 0x00000001
42 #define ESP_DEBUG_SCSICMD 0x00000002
43 #define ESP_DEBUG_RESET 0x00000004
44 #define ESP_DEBUG_MSGIN 0x00000008
45 #define ESP_DEBUG_MSGOUT 0x00000010
46 #define ESP_DEBUG_CMDDONE 0x00000020
47 #define ESP_DEBUG_DISCONNECT 0x00000040
48 #define ESP_DEBUG_DATASTART 0x00000080
49 #define ESP_DEBUG_DATADONE 0x00000100
50 #define ESP_DEBUG_RECONNECT 0x00000200
51 #define ESP_DEBUG_AUTOSENSE 0x00000400
52
53 #define esp_log_intr(f, a...) \
54 do { if (esp_debug & ESP_DEBUG_INTR) \
55 printk(f, ## a); \
56 } while (0)
57
58 #define esp_log_reset(f, a...) \
59 do { if (esp_debug & ESP_DEBUG_RESET) \
60 printk(f, ## a); \
61 } while (0)
62
63 #define esp_log_msgin(f, a...) \
64 do { if (esp_debug & ESP_DEBUG_MSGIN) \
65 printk(f, ## a); \
66 } while (0)
67
68 #define esp_log_msgout(f, a...) \
69 do { if (esp_debug & ESP_DEBUG_MSGOUT) \
70 printk(f, ## a); \
71 } while (0)
72
73 #define esp_log_cmddone(f, a...) \
74 do { if (esp_debug & ESP_DEBUG_CMDDONE) \
75 printk(f, ## a); \
76 } while (0)
77
78 #define esp_log_disconnect(f, a...) \
79 do { if (esp_debug & ESP_DEBUG_DISCONNECT) \
80 printk(f, ## a); \
81 } while (0)
82
83 #define esp_log_datastart(f, a...) \
84 do { if (esp_debug & ESP_DEBUG_DATASTART) \
85 printk(f, ## a); \
86 } while (0)
87
88 #define esp_log_datadone(f, a...) \
89 do { if (esp_debug & ESP_DEBUG_DATADONE) \
90 printk(f, ## a); \
91 } while (0)
92
93 #define esp_log_reconnect(f, a...) \
94 do { if (esp_debug & ESP_DEBUG_RECONNECT) \
95 printk(f, ## a); \
96 } while (0)
97
98 #define esp_log_autosense(f, a...) \
99 do { if (esp_debug & ESP_DEBUG_AUTOSENSE) \
100 printk(f, ## a); \
101 } while (0)
102
103 #define esp_read8(REG) esp->ops->esp_read8(esp, REG)
104 #define esp_write8(VAL,REG) esp->ops->esp_write8(esp, VAL, REG)
105
106 static void esp_log_fill_regs(struct esp *esp,
107 struct esp_event_ent *p)
108 {
109 p->sreg = esp->sreg;
110 p->seqreg = esp->seqreg;
111 p->sreg2 = esp->sreg2;
112 p->ireg = esp->ireg;
113 p->select_state = esp->select_state;
114 p->event = esp->event;
115 }
116
117 void scsi_esp_cmd(struct esp *esp, u8 val)
118 {
119 struct esp_event_ent *p;
120 int idx = esp->esp_event_cur;
121
122 p = &esp->esp_event_log[idx];
123 p->type = ESP_EVENT_TYPE_CMD;
124 p->val = val;
125 esp_log_fill_regs(esp, p);
126
127 esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
128
129 esp_write8(val, ESP_CMD);
130 }
131 EXPORT_SYMBOL(scsi_esp_cmd);
132
133 static void esp_event(struct esp *esp, u8 val)
134 {
135 struct esp_event_ent *p;
136 int idx = esp->esp_event_cur;
137
138 p = &esp->esp_event_log[idx];
139 p->type = ESP_EVENT_TYPE_EVENT;
140 p->val = val;
141 esp_log_fill_regs(esp, p);
142
143 esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
144
145 esp->event = val;
146 }
147
148 static void esp_dump_cmd_log(struct esp *esp)
149 {
150 int idx = esp->esp_event_cur;
151 int stop = idx;
152
153 printk(KERN_INFO PFX "esp%d: Dumping command log\n",
154 esp->host->unique_id);
155 do {
156 struct esp_event_ent *p = &esp->esp_event_log[idx];
157
158 printk(KERN_INFO PFX "esp%d: ent[%d] %s ",
159 esp->host->unique_id, idx,
160 p->type == ESP_EVENT_TYPE_CMD ? "CMD" : "EVENT");
161
162 printk("val[%02x] sreg[%02x] seqreg[%02x] "
163 "sreg2[%02x] ireg[%02x] ss[%02x] event[%02x]\n",
164 p->val, p->sreg, p->seqreg,
165 p->sreg2, p->ireg, p->select_state, p->event);
166
167 idx = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
168 } while (idx != stop);
169 }
170
171 static void esp_flush_fifo(struct esp *esp)
172 {
173 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
174 if (esp->rev == ESP236) {
175 int lim = 1000;
176
177 while (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES) {
178 if (--lim == 0) {
179 printk(KERN_ALERT PFX "esp%d: ESP_FF_BYTES "
180 "will not clear!\n",
181 esp->host->unique_id);
182 break;
183 }
184 udelay(1);
185 }
186 }
187 }
188
189 static void hme_read_fifo(struct esp *esp)
190 {
191 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
192 int idx = 0;
193
194 while (fcnt--) {
195 esp->fifo[idx++] = esp_read8(ESP_FDATA);
196 esp->fifo[idx++] = esp_read8(ESP_FDATA);
197 }
198 if (esp->sreg2 & ESP_STAT2_F1BYTE) {
199 esp_write8(0, ESP_FDATA);
200 esp->fifo[idx++] = esp_read8(ESP_FDATA);
201 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
202 }
203 esp->fifo_cnt = idx;
204 }
205
206 static void esp_set_all_config3(struct esp *esp, u8 val)
207 {
208 int i;
209
210 for (i = 0; i < ESP_MAX_TARGET; i++)
211 esp->target[i].esp_config3 = val;
212 }
213
214 /* Reset the ESP chip, _not_ the SCSI bus. */
215 static void esp_reset_esp(struct esp *esp)
216 {
217 u8 family_code, version;
218
219 /* Now reset the ESP chip */
220 scsi_esp_cmd(esp, ESP_CMD_RC);
221 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
222 if (esp->rev == FAST)
223 esp_write8(ESP_CONFIG2_FENAB, ESP_CFG2);
224 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
225
226 /* This is the only point at which it is reliable to read
227 * the ID-code for a fast ESP chip variants.
228 */
229 esp->max_period = ((35 * esp->ccycle) / 1000);
230 if (esp->rev == FAST) {
231 version = esp_read8(ESP_UID);
232 family_code = (version & 0xf8) >> 3;
233 if (family_code == 0x02)
234 esp->rev = FAS236;
235 else if (family_code == 0x0a)
236 esp->rev = FASHME; /* Version is usually '5'. */
237 else
238 esp->rev = FAS100A;
239 esp->min_period = ((4 * esp->ccycle) / 1000);
240 } else {
241 esp->min_period = ((5 * esp->ccycle) / 1000);
242 }
243 esp->max_period = (esp->max_period + 3)>>2;
244 esp->min_period = (esp->min_period + 3)>>2;
245
246 esp_write8(esp->config1, ESP_CFG1);
247 switch (esp->rev) {
248 case ESP100:
249 /* nothing to do */
250 break;
251
252 case ESP100A:
253 esp_write8(esp->config2, ESP_CFG2);
254 break;
255
256 case ESP236:
257 /* Slow 236 */
258 esp_write8(esp->config2, ESP_CFG2);
259 esp->prev_cfg3 = esp->target[0].esp_config3;
260 esp_write8(esp->prev_cfg3, ESP_CFG3);
261 break;
262
263 case FASHME:
264 esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB);
265 /* fallthrough... */
266
267 case FAS236:
268 /* Fast 236 or HME */
269 esp_write8(esp->config2, ESP_CFG2);
270 if (esp->rev == FASHME) {
271 u8 cfg3 = esp->target[0].esp_config3;
272
273 cfg3 |= ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH;
274 if (esp->scsi_id >= 8)
275 cfg3 |= ESP_CONFIG3_IDBIT3;
276 esp_set_all_config3(esp, cfg3);
277 } else {
278 u32 cfg3 = esp->target[0].esp_config3;
279
280 cfg3 |= ESP_CONFIG3_FCLK;
281 esp_set_all_config3(esp, cfg3);
282 }
283 esp->prev_cfg3 = esp->target[0].esp_config3;
284 esp_write8(esp->prev_cfg3, ESP_CFG3);
285 if (esp->rev == FASHME) {
286 esp->radelay = 80;
287 } else {
288 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
289 esp->radelay = 0;
290 else
291 esp->radelay = 96;
292 }
293 break;
294
295 case FAS100A:
296 /* Fast 100a */
297 esp_write8(esp->config2, ESP_CFG2);
298 esp_set_all_config3(esp,
299 (esp->target[0].esp_config3 |
300 ESP_CONFIG3_FCLOCK));
301 esp->prev_cfg3 = esp->target[0].esp_config3;
302 esp_write8(esp->prev_cfg3, ESP_CFG3);
303 esp->radelay = 32;
304 break;
305
306 default:
307 break;
308 }
309
310 /* Reload the configuration registers */
311 esp_write8(esp->cfact, ESP_CFACT);
312
313 esp->prev_stp = 0;
314 esp_write8(esp->prev_stp, ESP_STP);
315
316 esp->prev_soff = 0;
317 esp_write8(esp->prev_soff, ESP_SOFF);
318
319 esp_write8(esp->neg_defp, ESP_TIMEO);
320
321 /* Eat any bitrot in the chip */
322 esp_read8(ESP_INTRPT);
323 udelay(100);
324 }
325
326 static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
327 {
328 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
329 struct scatterlist *sg = scsi_sglist(cmd);
330 int dir = cmd->sc_data_direction;
331 int total, i;
332
333 if (dir == DMA_NONE)
334 return;
335
336 spriv->u.num_sg = esp->ops->map_sg(esp, sg, scsi_sg_count(cmd), dir);
337 spriv->cur_residue = sg_dma_len(sg);
338 spriv->cur_sg = sg;
339
340 total = 0;
341 for (i = 0; i < spriv->u.num_sg; i++)
342 total += sg_dma_len(&sg[i]);
343 spriv->tot_residue = total;
344 }
345
346 static dma_addr_t esp_cur_dma_addr(struct esp_cmd_entry *ent,
347 struct scsi_cmnd *cmd)
348 {
349 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
350
351 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
352 return ent->sense_dma +
353 (ent->sense_ptr - cmd->sense_buffer);
354 }
355
356 return sg_dma_address(p->cur_sg) +
357 (sg_dma_len(p->cur_sg) -
358 p->cur_residue);
359 }
360
361 static unsigned int esp_cur_dma_len(struct esp_cmd_entry *ent,
362 struct scsi_cmnd *cmd)
363 {
364 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
365
366 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
367 return SCSI_SENSE_BUFFERSIZE -
368 (ent->sense_ptr - cmd->sense_buffer);
369 }
370 return p->cur_residue;
371 }
372
373 static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent,
374 struct scsi_cmnd *cmd, unsigned int len)
375 {
376 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
377
378 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
379 ent->sense_ptr += len;
380 return;
381 }
382
383 p->cur_residue -= len;
384 p->tot_residue -= len;
385 if (p->cur_residue < 0 || p->tot_residue < 0) {
386 printk(KERN_ERR PFX "esp%d: Data transfer overflow.\n",
387 esp->host->unique_id);
388 printk(KERN_ERR PFX "esp%d: cur_residue[%d] tot_residue[%d] "
389 "len[%u]\n",
390 esp->host->unique_id,
391 p->cur_residue, p->tot_residue, len);
392 p->cur_residue = 0;
393 p->tot_residue = 0;
394 }
395 if (!p->cur_residue && p->tot_residue) {
396 p->cur_sg++;
397 p->cur_residue = sg_dma_len(p->cur_sg);
398 }
399 }
400
401 static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd)
402 {
403 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
404 int dir = cmd->sc_data_direction;
405
406 if (dir == DMA_NONE)
407 return;
408
409 esp->ops->unmap_sg(esp, scsi_sglist(cmd), spriv->u.num_sg, dir);
410 }
411
412 static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent)
413 {
414 struct scsi_cmnd *cmd = ent->cmd;
415 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
416
417 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
418 ent->saved_sense_ptr = ent->sense_ptr;
419 return;
420 }
421 ent->saved_cur_residue = spriv->cur_residue;
422 ent->saved_cur_sg = spriv->cur_sg;
423 ent->saved_tot_residue = spriv->tot_residue;
424 }
425
426 static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent)
427 {
428 struct scsi_cmnd *cmd = ent->cmd;
429 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
430
431 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
432 ent->sense_ptr = ent->saved_sense_ptr;
433 return;
434 }
435 spriv->cur_residue = ent->saved_cur_residue;
436 spriv->cur_sg = ent->saved_cur_sg;
437 spriv->tot_residue = ent->saved_tot_residue;
438 }
439
440 static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd)
441 {
442 if (cmd->cmd_len == 6 ||
443 cmd->cmd_len == 10 ||
444 cmd->cmd_len == 12) {
445 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
446 } else {
447 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
448 }
449 }
450
451 static void esp_write_tgt_config3(struct esp *esp, int tgt)
452 {
453 if (esp->rev > ESP100A) {
454 u8 val = esp->target[tgt].esp_config3;
455
456 if (val != esp->prev_cfg3) {
457 esp->prev_cfg3 = val;
458 esp_write8(val, ESP_CFG3);
459 }
460 }
461 }
462
463 static void esp_write_tgt_sync(struct esp *esp, int tgt)
464 {
465 u8 off = esp->target[tgt].esp_offset;
466 u8 per = esp->target[tgt].esp_period;
467
468 if (off != esp->prev_soff) {
469 esp->prev_soff = off;
470 esp_write8(off, ESP_SOFF);
471 }
472 if (per != esp->prev_stp) {
473 esp->prev_stp = per;
474 esp_write8(per, ESP_STP);
475 }
476 }
477
478 static u32 esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
479 {
480 if (esp->rev == FASHME) {
481 /* Arbitrary segment boundaries, 24-bit counts. */
482 if (dma_len > (1U << 24))
483 dma_len = (1U << 24);
484 } else {
485 u32 base, end;
486
487 /* ESP chip limits other variants by 16-bits of transfer
488 * count. Actually on FAS100A and FAS236 we could get
489 * 24-bits of transfer count by enabling ESP_CONFIG2_FENAB
490 * in the ESP_CFG2 register but that causes other unwanted
491 * changes so we don't use it currently.
492 */
493 if (dma_len > (1U << 16))
494 dma_len = (1U << 16);
495
496 /* All of the DMA variants hooked up to these chips
497 * cannot handle crossing a 24-bit address boundary.
498 */
499 base = dma_addr & ((1U << 24) - 1U);
500 end = base + dma_len;
501 if (end > (1U << 24))
502 end = (1U <<24);
503 dma_len = end - base;
504 }
505 return dma_len;
506 }
507
508 static int esp_need_to_nego_wide(struct esp_target_data *tp)
509 {
510 struct scsi_target *target = tp->starget;
511
512 return spi_width(target) != tp->nego_goal_width;
513 }
514
515 static int esp_need_to_nego_sync(struct esp_target_data *tp)
516 {
517 struct scsi_target *target = tp->starget;
518
519 /* When offset is zero, period is "don't care". */
520 if (!spi_offset(target) && !tp->nego_goal_offset)
521 return 0;
522
523 if (spi_offset(target) == tp->nego_goal_offset &&
524 spi_period(target) == tp->nego_goal_period)
525 return 0;
526
527 return 1;
528 }
529
530 static int esp_alloc_lun_tag(struct esp_cmd_entry *ent,
531 struct esp_lun_data *lp)
532 {
533 if (!ent->tag[0]) {
534 /* Non-tagged, slot already taken? */
535 if (lp->non_tagged_cmd)
536 return -EBUSY;
537
538 if (lp->hold) {
539 /* We are being held by active tagged
540 * commands.
541 */
542 if (lp->num_tagged)
543 return -EBUSY;
544
545 /* Tagged commands completed, we can unplug
546 * the queue and run this untagged command.
547 */
548 lp->hold = 0;
549 } else if (lp->num_tagged) {
550 /* Plug the queue until num_tagged decreases
551 * to zero in esp_free_lun_tag.
552 */
553 lp->hold = 1;
554 return -EBUSY;
555 }
556
557 lp->non_tagged_cmd = ent;
558 return 0;
559 } else {
560 /* Tagged command, see if blocked by a
561 * non-tagged one.
562 */
563 if (lp->non_tagged_cmd || lp->hold)
564 return -EBUSY;
565 }
566
567 BUG_ON(lp->tagged_cmds[ent->tag[1]]);
568
569 lp->tagged_cmds[ent->tag[1]] = ent;
570 lp->num_tagged++;
571
572 return 0;
573 }
574
575 static void esp_free_lun_tag(struct esp_cmd_entry *ent,
576 struct esp_lun_data *lp)
577 {
578 if (ent->tag[0]) {
579 BUG_ON(lp->tagged_cmds[ent->tag[1]] != ent);
580 lp->tagged_cmds[ent->tag[1]] = NULL;
581 lp->num_tagged--;
582 } else {
583 BUG_ON(lp->non_tagged_cmd != ent);
584 lp->non_tagged_cmd = NULL;
585 }
586 }
587
588 /* When a contingent allegiance conditon is created, we force feed a
589 * REQUEST_SENSE command to the device to fetch the sense data. I
590 * tried many other schemes, relying on the scsi error handling layer
591 * to send out the REQUEST_SENSE automatically, but this was difficult
592 * to get right especially in the presence of applications like smartd
593 * which use SG_IO to send out their own REQUEST_SENSE commands.
594 */
595 static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent)
596 {
597 struct scsi_cmnd *cmd = ent->cmd;
598 struct scsi_device *dev = cmd->device;
599 int tgt, lun;
600 u8 *p, val;
601
602 tgt = dev->id;
603 lun = dev->lun;
604
605
606 if (!ent->sense_ptr) {
607 esp_log_autosense("esp%d: Doing auto-sense for "
608 "tgt[%d] lun[%d]\n",
609 esp->host->unique_id, tgt, lun);
610
611 ent->sense_ptr = cmd->sense_buffer;
612 ent->sense_dma = esp->ops->map_single(esp,
613 ent->sense_ptr,
614 SCSI_SENSE_BUFFERSIZE,
615 DMA_FROM_DEVICE);
616 }
617 ent->saved_sense_ptr = ent->sense_ptr;
618
619 esp->active_cmd = ent;
620
621 p = esp->command_block;
622 esp->msg_out_len = 0;
623
624 *p++ = IDENTIFY(0, lun);
625 *p++ = REQUEST_SENSE;
626 *p++ = ((dev->scsi_level <= SCSI_2) ?
627 (lun << 5) : 0);
628 *p++ = 0;
629 *p++ = 0;
630 *p++ = SCSI_SENSE_BUFFERSIZE;
631 *p++ = 0;
632
633 esp->select_state = ESP_SELECT_BASIC;
634
635 val = tgt;
636 if (esp->rev == FASHME)
637 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
638 esp_write8(val, ESP_BUSID);
639
640 esp_write_tgt_sync(esp, tgt);
641 esp_write_tgt_config3(esp, tgt);
642
643 val = (p - esp->command_block);
644
645 if (esp->rev == FASHME)
646 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
647 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
648 val, 16, 0, ESP_CMD_DMA | ESP_CMD_SELA);
649 }
650
651 static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp)
652 {
653 struct esp_cmd_entry *ent;
654
655 list_for_each_entry(ent, &esp->queued_cmds, list) {
656 struct scsi_cmnd *cmd = ent->cmd;
657 struct scsi_device *dev = cmd->device;
658 struct esp_lun_data *lp = dev->hostdata;
659
660 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
661 ent->tag[0] = 0;
662 ent->tag[1] = 0;
663 return ent;
664 }
665
666 if (!scsi_populate_tag_msg(cmd, &ent->tag[0])) {
667 ent->tag[0] = 0;
668 ent->tag[1] = 0;
669 }
670
671 if (esp_alloc_lun_tag(ent, lp) < 0)
672 continue;
673
674 return ent;
675 }
676
677 return NULL;
678 }
679
680 static void esp_maybe_execute_command(struct esp *esp)
681 {
682 struct esp_target_data *tp;
683 struct esp_lun_data *lp;
684 struct scsi_device *dev;
685 struct scsi_cmnd *cmd;
686 struct esp_cmd_entry *ent;
687 int tgt, lun, i;
688 u32 val, start_cmd;
689 u8 *p;
690
691 if (esp->active_cmd ||
692 (esp->flags & ESP_FLAG_RESETTING))
693 return;
694
695 ent = find_and_prep_issuable_command(esp);
696 if (!ent)
697 return;
698
699 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
700 esp_autosense(esp, ent);
701 return;
702 }
703
704 cmd = ent->cmd;
705 dev = cmd->device;
706 tgt = dev->id;
707 lun = dev->lun;
708 tp = &esp->target[tgt];
709 lp = dev->hostdata;
710
711 list_move(&ent->list, &esp->active_cmds);
712
713 esp->active_cmd = ent;
714
715 esp_map_dma(esp, cmd);
716 esp_save_pointers(esp, ent);
717
718 esp_check_command_len(esp, cmd);
719
720 p = esp->command_block;
721
722 esp->msg_out_len = 0;
723 if (tp->flags & ESP_TGT_CHECK_NEGO) {
724 /* Need to negotiate. If the target is broken
725 * go for synchronous transfers and non-wide.
726 */
727 if (tp->flags & ESP_TGT_BROKEN) {
728 tp->flags &= ~ESP_TGT_DISCONNECT;
729 tp->nego_goal_period = 0;
730 tp->nego_goal_offset = 0;
731 tp->nego_goal_width = 0;
732 tp->nego_goal_tags = 0;
733 }
734
735 /* If the settings are not changing, skip this. */
736 if (spi_width(tp->starget) == tp->nego_goal_width &&
737 spi_period(tp->starget) == tp->nego_goal_period &&
738 spi_offset(tp->starget) == tp->nego_goal_offset) {
739 tp->flags &= ~ESP_TGT_CHECK_NEGO;
740 goto build_identify;
741 }
742
743 if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) {
744 esp->msg_out_len =
745 spi_populate_width_msg(&esp->msg_out[0],
746 (tp->nego_goal_width ?
747 1 : 0));
748 tp->flags |= ESP_TGT_NEGO_WIDE;
749 } else if (esp_need_to_nego_sync(tp)) {
750 esp->msg_out_len =
751 spi_populate_sync_msg(&esp->msg_out[0],
752 tp->nego_goal_period,
753 tp->nego_goal_offset);
754 tp->flags |= ESP_TGT_NEGO_SYNC;
755 } else {
756 tp->flags &= ~ESP_TGT_CHECK_NEGO;
757 }
758
759 /* Process it like a slow command. */
760 if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC))
761 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
762 }
763
764 build_identify:
765 /* If we don't have a lun-data struct yet, we're probing
766 * so do not disconnect. Also, do not disconnect unless
767 * we have a tag on this command.
768 */
769 if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0])
770 *p++ = IDENTIFY(1, lun);
771 else
772 *p++ = IDENTIFY(0, lun);
773
774 if (ent->tag[0] && esp->rev == ESP100) {
775 /* ESP100 lacks select w/atn3 command, use select
776 * and stop instead.
777 */
778 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
779 }
780
781 if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) {
782 start_cmd = ESP_CMD_DMA | ESP_CMD_SELA;
783 if (ent->tag[0]) {
784 *p++ = ent->tag[0];
785 *p++ = ent->tag[1];
786
787 start_cmd = ESP_CMD_DMA | ESP_CMD_SA3;
788 }
789
790 for (i = 0; i < cmd->cmd_len; i++)
791 *p++ = cmd->cmnd[i];
792
793 esp->select_state = ESP_SELECT_BASIC;
794 } else {
795 esp->cmd_bytes_left = cmd->cmd_len;
796 esp->cmd_bytes_ptr = &cmd->cmnd[0];
797
798 if (ent->tag[0]) {
799 for (i = esp->msg_out_len - 1;
800 i >= 0; i--)
801 esp->msg_out[i + 2] = esp->msg_out[i];
802 esp->msg_out[0] = ent->tag[0];
803 esp->msg_out[1] = ent->tag[1];
804 esp->msg_out_len += 2;
805 }
806
807 start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS;
808 esp->select_state = ESP_SELECT_MSGOUT;
809 }
810 val = tgt;
811 if (esp->rev == FASHME)
812 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
813 esp_write8(val, ESP_BUSID);
814
815 esp_write_tgt_sync(esp, tgt);
816 esp_write_tgt_config3(esp, tgt);
817
818 val = (p - esp->command_block);
819
820 if (esp_debug & ESP_DEBUG_SCSICMD) {
821 printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun);
822 for (i = 0; i < cmd->cmd_len; i++)
823 printk("%02x ", cmd->cmnd[i]);
824 printk("]\n");
825 }
826
827 if (esp->rev == FASHME)
828 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
829 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
830 val, 16, 0, start_cmd);
831 }
832
833 static struct esp_cmd_entry *esp_get_ent(struct esp *esp)
834 {
835 struct list_head *head = &esp->esp_cmd_pool;
836 struct esp_cmd_entry *ret;
837
838 if (list_empty(head)) {
839 ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC);
840 } else {
841 ret = list_entry(head->next, struct esp_cmd_entry, list);
842 list_del(&ret->list);
843 memset(ret, 0, sizeof(*ret));
844 }
845 return ret;
846 }
847
848 static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent)
849 {
850 list_add(&ent->list, &esp->esp_cmd_pool);
851 }
852
853 static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent,
854 struct scsi_cmnd *cmd, unsigned int result)
855 {
856 struct scsi_device *dev = cmd->device;
857 int tgt = dev->id;
858 int lun = dev->lun;
859
860 esp->active_cmd = NULL;
861 esp_unmap_dma(esp, cmd);
862 esp_free_lun_tag(ent, dev->hostdata);
863 cmd->result = result;
864
865 if (ent->eh_done) {
866 complete(ent->eh_done);
867 ent->eh_done = NULL;
868 }
869
870 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
871 esp->ops->unmap_single(esp, ent->sense_dma,
872 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
873 ent->sense_ptr = NULL;
874
875 /* Restore the message/status bytes to what we actually
876 * saw originally. Also, report that we are providing
877 * the sense data.
878 */
879 cmd->result = ((DRIVER_SENSE << 24) |
880 (DID_OK << 16) |
881 (COMMAND_COMPLETE << 8) |
882 (SAM_STAT_CHECK_CONDITION << 0));
883
884 ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE;
885 if (esp_debug & ESP_DEBUG_AUTOSENSE) {
886 int i;
887
888 printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ",
889 esp->host->unique_id, tgt, lun);
890 for (i = 0; i < 18; i++)
891 printk("%02x ", cmd->sense_buffer[i]);
892 printk("]\n");
893 }
894 }
895
896 cmd->scsi_done(cmd);
897
898 list_del(&ent->list);
899 esp_put_ent(esp, ent);
900
901 esp_maybe_execute_command(esp);
902 }
903
904 static unsigned int compose_result(unsigned int status, unsigned int message,
905 unsigned int driver_code)
906 {
907 return (status | (message << 8) | (driver_code << 16));
908 }
909
910 static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent)
911 {
912 struct scsi_device *dev = ent->cmd->device;
913 struct esp_lun_data *lp = dev->hostdata;
914
915 scsi_track_queue_full(dev, lp->num_tagged - 1);
916 }
917
918 static int esp_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
919 {
920 struct scsi_device *dev = cmd->device;
921 struct esp *esp = shost_priv(dev->host);
922 struct esp_cmd_priv *spriv;
923 struct esp_cmd_entry *ent;
924
925 ent = esp_get_ent(esp);
926 if (!ent)
927 return SCSI_MLQUEUE_HOST_BUSY;
928
929 ent->cmd = cmd;
930
931 cmd->scsi_done = done;
932
933 spriv = ESP_CMD_PRIV(cmd);
934 spriv->u.dma_addr = ~(dma_addr_t)0x0;
935
936 list_add_tail(&ent->list, &esp->queued_cmds);
937
938 esp_maybe_execute_command(esp);
939
940 return 0;
941 }
942
943 static DEF_SCSI_QCMD(esp_queuecommand)
944
945 static int esp_check_gross_error(struct esp *esp)
946 {
947 if (esp->sreg & ESP_STAT_SPAM) {
948 /* Gross Error, could be one of:
949 * - top of fifo overwritten
950 * - top of command register overwritten
951 * - DMA programmed with wrong direction
952 * - improper phase change
953 */
954 printk(KERN_ERR PFX "esp%d: Gross error sreg[%02x]\n",
955 esp->host->unique_id, esp->sreg);
956 /* XXX Reset the chip. XXX */
957 return 1;
958 }
959 return 0;
960 }
961
962 static int esp_check_spur_intr(struct esp *esp)
963 {
964 switch (esp->rev) {
965 case ESP100:
966 case ESP100A:
967 /* The interrupt pending bit of the status register cannot
968 * be trusted on these revisions.
969 */
970 esp->sreg &= ~ESP_STAT_INTR;
971 break;
972
973 default:
974 if (!(esp->sreg & ESP_STAT_INTR)) {
975 esp->ireg = esp_read8(ESP_INTRPT);
976 if (esp->ireg & ESP_INTR_SR)
977 return 1;
978
979 /* If the DMA is indicating interrupt pending and the
980 * ESP is not, the only possibility is a DMA error.
981 */
982 if (!esp->ops->dma_error(esp)) {
983 printk(KERN_ERR PFX "esp%d: Spurious irq, "
984 "sreg=%02x.\n",
985 esp->host->unique_id, esp->sreg);
986 return -1;
987 }
988
989 printk(KERN_ERR PFX "esp%d: DMA error\n",
990 esp->host->unique_id);
991
992 /* XXX Reset the chip. XXX */
993 return -1;
994 }
995 break;
996 }
997
998 return 0;
999 }
1000
1001 static void esp_schedule_reset(struct esp *esp)
1002 {
1003 esp_log_reset("ESP: esp_schedule_reset() from %p\n",
1004 __builtin_return_address(0));
1005 esp->flags |= ESP_FLAG_RESETTING;
1006 esp_event(esp, ESP_EVENT_RESET);
1007 }
1008
1009 /* In order to avoid having to add a special half-reconnected state
1010 * into the driver we just sit here and poll through the rest of
1011 * the reselection process to get the tag message bytes.
1012 */
1013 static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp,
1014 struct esp_lun_data *lp)
1015 {
1016 struct esp_cmd_entry *ent;
1017 int i;
1018
1019 if (!lp->num_tagged) {
1020 printk(KERN_ERR PFX "esp%d: Reconnect w/num_tagged==0\n",
1021 esp->host->unique_id);
1022 return NULL;
1023 }
1024
1025 esp_log_reconnect("ESP: reconnect tag, ");
1026
1027 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
1028 if (esp->ops->irq_pending(esp))
1029 break;
1030 }
1031 if (i == ESP_QUICKIRQ_LIMIT) {
1032 printk(KERN_ERR PFX "esp%d: Reconnect IRQ1 timeout\n",
1033 esp->host->unique_id);
1034 return NULL;
1035 }
1036
1037 esp->sreg = esp_read8(ESP_STATUS);
1038 esp->ireg = esp_read8(ESP_INTRPT);
1039
1040 esp_log_reconnect("IRQ(%d:%x:%x), ",
1041 i, esp->ireg, esp->sreg);
1042
1043 if (esp->ireg & ESP_INTR_DC) {
1044 printk(KERN_ERR PFX "esp%d: Reconnect, got disconnect.\n",
1045 esp->host->unique_id);
1046 return NULL;
1047 }
1048
1049 if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) {
1050 printk(KERN_ERR PFX "esp%d: Reconnect, not MIP sreg[%02x].\n",
1051 esp->host->unique_id, esp->sreg);
1052 return NULL;
1053 }
1054
1055 /* DMA in the tag bytes... */
1056 esp->command_block[0] = 0xff;
1057 esp->command_block[1] = 0xff;
1058 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1059 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI);
1060
1061 /* ACK the message. */
1062 scsi_esp_cmd(esp, ESP_CMD_MOK);
1063
1064 for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) {
1065 if (esp->ops->irq_pending(esp)) {
1066 esp->sreg = esp_read8(ESP_STATUS);
1067 esp->ireg = esp_read8(ESP_INTRPT);
1068 if (esp->ireg & ESP_INTR_FDONE)
1069 break;
1070 }
1071 udelay(1);
1072 }
1073 if (i == ESP_RESELECT_TAG_LIMIT) {
1074 printk(KERN_ERR PFX "esp%d: Reconnect IRQ2 timeout\n",
1075 esp->host->unique_id);
1076 return NULL;
1077 }
1078 esp->ops->dma_drain(esp);
1079 esp->ops->dma_invalidate(esp);
1080
1081 esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n",
1082 i, esp->ireg, esp->sreg,
1083 esp->command_block[0],
1084 esp->command_block[1]);
1085
1086 if (esp->command_block[0] < SIMPLE_QUEUE_TAG ||
1087 esp->command_block[0] > ORDERED_QUEUE_TAG) {
1088 printk(KERN_ERR PFX "esp%d: Reconnect, bad tag "
1089 "type %02x.\n",
1090 esp->host->unique_id, esp->command_block[0]);
1091 return NULL;
1092 }
1093
1094 ent = lp->tagged_cmds[esp->command_block[1]];
1095 if (!ent) {
1096 printk(KERN_ERR PFX "esp%d: Reconnect, no entry for "
1097 "tag %02x.\n",
1098 esp->host->unique_id, esp->command_block[1]);
1099 return NULL;
1100 }
1101
1102 return ent;
1103 }
1104
1105 static int esp_reconnect(struct esp *esp)
1106 {
1107 struct esp_cmd_entry *ent;
1108 struct esp_target_data *tp;
1109 struct esp_lun_data *lp;
1110 struct scsi_device *dev;
1111 int target, lun;
1112
1113 BUG_ON(esp->active_cmd);
1114 if (esp->rev == FASHME) {
1115 /* FASHME puts the target and lun numbers directly
1116 * into the fifo.
1117 */
1118 target = esp->fifo[0];
1119 lun = esp->fifo[1] & 0x7;
1120 } else {
1121 u8 bits = esp_read8(ESP_FDATA);
1122
1123 /* Older chips put the lun directly into the fifo, but
1124 * the target is given as a sample of the arbitration
1125 * lines on the bus at reselection time. So we should
1126 * see the ID of the ESP and the one reconnecting target
1127 * set in the bitmap.
1128 */
1129 if (!(bits & esp->scsi_id_mask))
1130 goto do_reset;
1131 bits &= ~esp->scsi_id_mask;
1132 if (!bits || (bits & (bits - 1)))
1133 goto do_reset;
1134
1135 target = ffs(bits) - 1;
1136 lun = (esp_read8(ESP_FDATA) & 0x7);
1137
1138 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1139 if (esp->rev == ESP100) {
1140 u8 ireg = esp_read8(ESP_INTRPT);
1141 /* This chip has a bug during reselection that can
1142 * cause a spurious illegal-command interrupt, which
1143 * we simply ACK here. Another possibility is a bus
1144 * reset so we must check for that.
1145 */
1146 if (ireg & ESP_INTR_SR)
1147 goto do_reset;
1148 }
1149 scsi_esp_cmd(esp, ESP_CMD_NULL);
1150 }
1151
1152 esp_write_tgt_sync(esp, target);
1153 esp_write_tgt_config3(esp, target);
1154
1155 scsi_esp_cmd(esp, ESP_CMD_MOK);
1156
1157 if (esp->rev == FASHME)
1158 esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT,
1159 ESP_BUSID);
1160
1161 tp = &esp->target[target];
1162 dev = __scsi_device_lookup_by_target(tp->starget, lun);
1163 if (!dev) {
1164 printk(KERN_ERR PFX "esp%d: Reconnect, no lp "
1165 "tgt[%u] lun[%u]\n",
1166 esp->host->unique_id, target, lun);
1167 goto do_reset;
1168 }
1169 lp = dev->hostdata;
1170
1171 ent = lp->non_tagged_cmd;
1172 if (!ent) {
1173 ent = esp_reconnect_with_tag(esp, lp);
1174 if (!ent)
1175 goto do_reset;
1176 }
1177
1178 esp->active_cmd = ent;
1179
1180 if (ent->flags & ESP_CMD_FLAG_ABORT) {
1181 esp->msg_out[0] = ABORT_TASK_SET;
1182 esp->msg_out_len = 1;
1183 scsi_esp_cmd(esp, ESP_CMD_SATN);
1184 }
1185
1186 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1187 esp_restore_pointers(esp, ent);
1188 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1189 return 1;
1190
1191 do_reset:
1192 esp_schedule_reset(esp);
1193 return 0;
1194 }
1195
1196 static int esp_finish_select(struct esp *esp)
1197 {
1198 struct esp_cmd_entry *ent;
1199 struct scsi_cmnd *cmd;
1200 u8 orig_select_state;
1201
1202 orig_select_state = esp->select_state;
1203
1204 /* No longer selecting. */
1205 esp->select_state = ESP_SELECT_NONE;
1206
1207 esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS;
1208 ent = esp->active_cmd;
1209 cmd = ent->cmd;
1210
1211 if (esp->ops->dma_error(esp)) {
1212 /* If we see a DMA error during or as a result of selection,
1213 * all bets are off.
1214 */
1215 esp_schedule_reset(esp);
1216 esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16));
1217 return 0;
1218 }
1219
1220 esp->ops->dma_invalidate(esp);
1221
1222 if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
1223 struct esp_target_data *tp = &esp->target[cmd->device->id];
1224
1225 /* Carefully back out of the selection attempt. Release
1226 * resources (such as DMA mapping & TAG) and reset state (such
1227 * as message out and command delivery variables).
1228 */
1229 if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1230 esp_unmap_dma(esp, cmd);
1231 esp_free_lun_tag(ent, cmd->device->hostdata);
1232 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE);
1233 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
1234 esp->cmd_bytes_ptr = NULL;
1235 esp->cmd_bytes_left = 0;
1236 } else {
1237 esp->ops->unmap_single(esp, ent->sense_dma,
1238 SCSI_SENSE_BUFFERSIZE,
1239 DMA_FROM_DEVICE);
1240 ent->sense_ptr = NULL;
1241 }
1242
1243 /* Now that the state is unwound properly, put back onto
1244 * the issue queue. This command is no longer active.
1245 */
1246 list_move(&ent->list, &esp->queued_cmds);
1247 esp->active_cmd = NULL;
1248
1249 /* Return value ignored by caller, it directly invokes
1250 * esp_reconnect().
1251 */
1252 return 0;
1253 }
1254
1255 if (esp->ireg == ESP_INTR_DC) {
1256 struct scsi_device *dev = cmd->device;
1257
1258 /* Disconnect. Make sure we re-negotiate sync and
1259 * wide parameters if this target starts responding
1260 * again in the future.
1261 */
1262 esp->target[dev->id].flags |= ESP_TGT_CHECK_NEGO;
1263
1264 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1265 esp_cmd_is_done(esp, ent, cmd, (DID_BAD_TARGET << 16));
1266 return 1;
1267 }
1268
1269 if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
1270 /* Selection successful. On pre-FAST chips we have
1271 * to do a NOP and possibly clean out the FIFO.
1272 */
1273 if (esp->rev <= ESP236) {
1274 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1275
1276 scsi_esp_cmd(esp, ESP_CMD_NULL);
1277
1278 if (!fcnt &&
1279 (!esp->prev_soff ||
1280 ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
1281 esp_flush_fifo(esp);
1282 }
1283
1284 /* If we are doing a slow command, negotiation, etc.
1285 * we'll do the right thing as we transition to the
1286 * next phase.
1287 */
1288 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1289 return 0;
1290 }
1291
1292 printk("ESP: Unexpected selection completion ireg[%x].\n",
1293 esp->ireg);
1294 esp_schedule_reset(esp);
1295 return 0;
1296 }
1297
1298 static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,
1299 struct scsi_cmnd *cmd)
1300 {
1301 int fifo_cnt, ecount, bytes_sent, flush_fifo;
1302
1303 fifo_cnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1304 if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE)
1305 fifo_cnt <<= 1;
1306
1307 ecount = 0;
1308 if (!(esp->sreg & ESP_STAT_TCNT)) {
1309 ecount = ((unsigned int)esp_read8(ESP_TCLOW) |
1310 (((unsigned int)esp_read8(ESP_TCMED)) << 8));
1311 if (esp->rev == FASHME)
1312 ecount |= ((unsigned int)esp_read8(FAS_RLO)) << 16;
1313 }
1314
1315 bytes_sent = esp->data_dma_len;
1316 bytes_sent -= ecount;
1317
1318 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1319 bytes_sent -= fifo_cnt;
1320
1321 flush_fifo = 0;
1322 if (!esp->prev_soff) {
1323 /* Synchronous data transfer, always flush fifo. */
1324 flush_fifo = 1;
1325 } else {
1326 if (esp->rev == ESP100) {
1327 u32 fflags, phase;
1328
1329 /* ESP100 has a chip bug where in the synchronous data
1330 * phase it can mistake a final long REQ pulse from the
1331 * target as an extra data byte. Fun.
1332 *
1333 * To detect this case we resample the status register
1334 * and fifo flags. If we're still in a data phase and
1335 * we see spurious chunks in the fifo, we return error
1336 * to the caller which should reset and set things up
1337 * such that we only try future transfers to this
1338 * target in synchronous mode.
1339 */
1340 esp->sreg = esp_read8(ESP_STATUS);
1341 phase = esp->sreg & ESP_STAT_PMASK;
1342 fflags = esp_read8(ESP_FFLAGS);
1343
1344 if ((phase == ESP_DOP &&
1345 (fflags & ESP_FF_ONOTZERO)) ||
1346 (phase == ESP_DIP &&
1347 (fflags & ESP_FF_FBYTES)))
1348 return -1;
1349 }
1350 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1351 flush_fifo = 1;
1352 }
1353
1354 if (flush_fifo)
1355 esp_flush_fifo(esp);
1356
1357 return bytes_sent;
1358 }
1359
1360 static void esp_setsync(struct esp *esp, struct esp_target_data *tp,
1361 u8 scsi_period, u8 scsi_offset,
1362 u8 esp_stp, u8 esp_soff)
1363 {
1364 spi_period(tp->starget) = scsi_period;
1365 spi_offset(tp->starget) = scsi_offset;
1366 spi_width(tp->starget) = (tp->flags & ESP_TGT_WIDE) ? 1 : 0;
1367
1368 if (esp_soff) {
1369 esp_stp &= 0x1f;
1370 esp_soff |= esp->radelay;
1371 if (esp->rev >= FAS236) {
1372 u8 bit = ESP_CONFIG3_FSCSI;
1373 if (esp->rev >= FAS100A)
1374 bit = ESP_CONFIG3_FAST;
1375
1376 if (scsi_period < 50) {
1377 if (esp->rev == FASHME)
1378 esp_soff &= ~esp->radelay;
1379 tp->esp_config3 |= bit;
1380 } else {
1381 tp->esp_config3 &= ~bit;
1382 }
1383 esp->prev_cfg3 = tp->esp_config3;
1384 esp_write8(esp->prev_cfg3, ESP_CFG3);
1385 }
1386 }
1387
1388 tp->esp_period = esp->prev_stp = esp_stp;
1389 tp->esp_offset = esp->prev_soff = esp_soff;
1390
1391 esp_write8(esp_soff, ESP_SOFF);
1392 esp_write8(esp_stp, ESP_STP);
1393
1394 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1395
1396 spi_display_xfer_agreement(tp->starget);
1397 }
1398
1399 static void esp_msgin_reject(struct esp *esp)
1400 {
1401 struct esp_cmd_entry *ent = esp->active_cmd;
1402 struct scsi_cmnd *cmd = ent->cmd;
1403 struct esp_target_data *tp;
1404 int tgt;
1405
1406 tgt = cmd->device->id;
1407 tp = &esp->target[tgt];
1408
1409 if (tp->flags & ESP_TGT_NEGO_WIDE) {
1410 tp->flags &= ~(ESP_TGT_NEGO_WIDE | ESP_TGT_WIDE);
1411
1412 if (!esp_need_to_nego_sync(tp)) {
1413 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1414 scsi_esp_cmd(esp, ESP_CMD_RATN);
1415 } else {
1416 esp->msg_out_len =
1417 spi_populate_sync_msg(&esp->msg_out[0],
1418 tp->nego_goal_period,
1419 tp->nego_goal_offset);
1420 tp->flags |= ESP_TGT_NEGO_SYNC;
1421 scsi_esp_cmd(esp, ESP_CMD_SATN);
1422 }
1423 return;
1424 }
1425
1426 if (tp->flags & ESP_TGT_NEGO_SYNC) {
1427 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1428 tp->esp_period = 0;
1429 tp->esp_offset = 0;
1430 esp_setsync(esp, tp, 0, 0, 0, 0);
1431 scsi_esp_cmd(esp, ESP_CMD_RATN);
1432 return;
1433 }
1434
1435 esp->msg_out[0] = ABORT_TASK_SET;
1436 esp->msg_out_len = 1;
1437 scsi_esp_cmd(esp, ESP_CMD_SATN);
1438 }
1439
1440 static void esp_msgin_sdtr(struct esp *esp, struct esp_target_data *tp)
1441 {
1442 u8 period = esp->msg_in[3];
1443 u8 offset = esp->msg_in[4];
1444 u8 stp;
1445
1446 if (!(tp->flags & ESP_TGT_NEGO_SYNC))
1447 goto do_reject;
1448
1449 if (offset > 15)
1450 goto do_reject;
1451
1452 if (offset) {
1453 int one_clock;
1454
1455 if (period > esp->max_period) {
1456 period = offset = 0;
1457 goto do_sdtr;
1458 }
1459 if (period < esp->min_period)
1460 goto do_reject;
1461
1462 one_clock = esp->ccycle / 1000;
1463 stp = DIV_ROUND_UP(period << 2, one_clock);
1464 if (stp && esp->rev >= FAS236) {
1465 if (stp >= 50)
1466 stp--;
1467 }
1468 } else {
1469 stp = 0;
1470 }
1471
1472 esp_setsync(esp, tp, period, offset, stp, offset);
1473 return;
1474
1475 do_reject:
1476 esp->msg_out[0] = MESSAGE_REJECT;
1477 esp->msg_out_len = 1;
1478 scsi_esp_cmd(esp, ESP_CMD_SATN);
1479 return;
1480
1481 do_sdtr:
1482 tp->nego_goal_period = period;
1483 tp->nego_goal_offset = offset;
1484 esp->msg_out_len =
1485 spi_populate_sync_msg(&esp->msg_out[0],
1486 tp->nego_goal_period,
1487 tp->nego_goal_offset);
1488 scsi_esp_cmd(esp, ESP_CMD_SATN);
1489 }
1490
1491 static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp)
1492 {
1493 int size = 8 << esp->msg_in[3];
1494 u8 cfg3;
1495
1496 if (esp->rev != FASHME)
1497 goto do_reject;
1498
1499 if (size != 8 && size != 16)
1500 goto do_reject;
1501
1502 if (!(tp->flags & ESP_TGT_NEGO_WIDE))
1503 goto do_reject;
1504
1505 cfg3 = tp->esp_config3;
1506 if (size == 16) {
1507 tp->flags |= ESP_TGT_WIDE;
1508 cfg3 |= ESP_CONFIG3_EWIDE;
1509 } else {
1510 tp->flags &= ~ESP_TGT_WIDE;
1511 cfg3 &= ~ESP_CONFIG3_EWIDE;
1512 }
1513 tp->esp_config3 = cfg3;
1514 esp->prev_cfg3 = cfg3;
1515 esp_write8(cfg3, ESP_CFG3);
1516
1517 tp->flags &= ~ESP_TGT_NEGO_WIDE;
1518
1519 spi_period(tp->starget) = 0;
1520 spi_offset(tp->starget) = 0;
1521 if (!esp_need_to_nego_sync(tp)) {
1522 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1523 scsi_esp_cmd(esp, ESP_CMD_RATN);
1524 } else {
1525 esp->msg_out_len =
1526 spi_populate_sync_msg(&esp->msg_out[0],
1527 tp->nego_goal_period,
1528 tp->nego_goal_offset);
1529 tp->flags |= ESP_TGT_NEGO_SYNC;
1530 scsi_esp_cmd(esp, ESP_CMD_SATN);
1531 }
1532 return;
1533
1534 do_reject:
1535 esp->msg_out[0] = MESSAGE_REJECT;
1536 esp->msg_out_len = 1;
1537 scsi_esp_cmd(esp, ESP_CMD_SATN);
1538 }
1539
1540 static void esp_msgin_extended(struct esp *esp)
1541 {
1542 struct esp_cmd_entry *ent = esp->active_cmd;
1543 struct scsi_cmnd *cmd = ent->cmd;
1544 struct esp_target_data *tp;
1545 int tgt = cmd->device->id;
1546
1547 tp = &esp->target[tgt];
1548 if (esp->msg_in[2] == EXTENDED_SDTR) {
1549 esp_msgin_sdtr(esp, tp);
1550 return;
1551 }
1552 if (esp->msg_in[2] == EXTENDED_WDTR) {
1553 esp_msgin_wdtr(esp, tp);
1554 return;
1555 }
1556
1557 printk("ESP: Unexpected extended msg type %x\n",
1558 esp->msg_in[2]);
1559
1560 esp->msg_out[0] = ABORT_TASK_SET;
1561 esp->msg_out_len = 1;
1562 scsi_esp_cmd(esp, ESP_CMD_SATN);
1563 }
1564
1565 /* Analyze msgin bytes received from target so far. Return non-zero
1566 * if there are more bytes needed to complete the message.
1567 */
1568 static int esp_msgin_process(struct esp *esp)
1569 {
1570 u8 msg0 = esp->msg_in[0];
1571 int len = esp->msg_in_len;
1572
1573 if (msg0 & 0x80) {
1574 /* Identify */
1575 printk("ESP: Unexpected msgin identify\n");
1576 return 0;
1577 }
1578
1579 switch (msg0) {
1580 case EXTENDED_MESSAGE:
1581 if (len == 1)
1582 return 1;
1583 if (len < esp->msg_in[1] + 2)
1584 return 1;
1585 esp_msgin_extended(esp);
1586 return 0;
1587
1588 case IGNORE_WIDE_RESIDUE: {
1589 struct esp_cmd_entry *ent;
1590 struct esp_cmd_priv *spriv;
1591 if (len == 1)
1592 return 1;
1593
1594 if (esp->msg_in[1] != 1)
1595 goto do_reject;
1596
1597 ent = esp->active_cmd;
1598 spriv = ESP_CMD_PRIV(ent->cmd);
1599
1600 if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) {
1601 spriv->cur_sg--;
1602 spriv->cur_residue = 1;
1603 } else
1604 spriv->cur_residue++;
1605 spriv->tot_residue++;
1606 return 0;
1607 }
1608 case NOP:
1609 return 0;
1610 case RESTORE_POINTERS:
1611 esp_restore_pointers(esp, esp->active_cmd);
1612 return 0;
1613 case SAVE_POINTERS:
1614 esp_save_pointers(esp, esp->active_cmd);
1615 return 0;
1616
1617 case COMMAND_COMPLETE:
1618 case DISCONNECT: {
1619 struct esp_cmd_entry *ent = esp->active_cmd;
1620
1621 ent->message = msg0;
1622 esp_event(esp, ESP_EVENT_FREE_BUS);
1623 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1624 return 0;
1625 }
1626 case MESSAGE_REJECT:
1627 esp_msgin_reject(esp);
1628 return 0;
1629
1630 default:
1631 do_reject:
1632 esp->msg_out[0] = MESSAGE_REJECT;
1633 esp->msg_out_len = 1;
1634 scsi_esp_cmd(esp, ESP_CMD_SATN);
1635 return 0;
1636 }
1637 }
1638
1639 static int esp_process_event(struct esp *esp)
1640 {
1641 int write;
1642
1643 again:
1644 write = 0;
1645 switch (esp->event) {
1646 case ESP_EVENT_CHECK_PHASE:
1647 switch (esp->sreg & ESP_STAT_PMASK) {
1648 case ESP_DOP:
1649 esp_event(esp, ESP_EVENT_DATA_OUT);
1650 break;
1651 case ESP_DIP:
1652 esp_event(esp, ESP_EVENT_DATA_IN);
1653 break;
1654 case ESP_STATP:
1655 esp_flush_fifo(esp);
1656 scsi_esp_cmd(esp, ESP_CMD_ICCSEQ);
1657 esp_event(esp, ESP_EVENT_STATUS);
1658 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1659 return 1;
1660
1661 case ESP_MOP:
1662 esp_event(esp, ESP_EVENT_MSGOUT);
1663 break;
1664
1665 case ESP_MIP:
1666 esp_event(esp, ESP_EVENT_MSGIN);
1667 break;
1668
1669 case ESP_CMDP:
1670 esp_event(esp, ESP_EVENT_CMD_START);
1671 break;
1672
1673 default:
1674 printk("ESP: Unexpected phase, sreg=%02x\n",
1675 esp->sreg);
1676 esp_schedule_reset(esp);
1677 return 0;
1678 }
1679 goto again;
1680 break;
1681
1682 case ESP_EVENT_DATA_IN:
1683 write = 1;
1684 /* fallthru */
1685
1686 case ESP_EVENT_DATA_OUT: {
1687 struct esp_cmd_entry *ent = esp->active_cmd;
1688 struct scsi_cmnd *cmd = ent->cmd;
1689 dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd);
1690 unsigned int dma_len = esp_cur_dma_len(ent, cmd);
1691
1692 if (esp->rev == ESP100)
1693 scsi_esp_cmd(esp, ESP_CMD_NULL);
1694
1695 if (write)
1696 ent->flags |= ESP_CMD_FLAG_WRITE;
1697 else
1698 ent->flags &= ~ESP_CMD_FLAG_WRITE;
1699
1700 if (esp->ops->dma_length_limit)
1701 dma_len = esp->ops->dma_length_limit(esp, dma_addr,
1702 dma_len);
1703 else
1704 dma_len = esp_dma_length_limit(esp, dma_addr, dma_len);
1705
1706 esp->data_dma_len = dma_len;
1707
1708 if (!dma_len) {
1709 printk(KERN_ERR PFX "esp%d: DMA length is zero!\n",
1710 esp->host->unique_id);
1711 printk(KERN_ERR PFX "esp%d: cur adr[%08llx] len[%08x]\n",
1712 esp->host->unique_id,
1713 (unsigned long long)esp_cur_dma_addr(ent, cmd),
1714 esp_cur_dma_len(ent, cmd));
1715 esp_schedule_reset(esp);
1716 return 0;
1717 }
1718
1719 esp_log_datastart("ESP: start data addr[%08llx] len[%u] "
1720 "write(%d)\n",
1721 (unsigned long long)dma_addr, dma_len, write);
1722
1723 esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len,
1724 write, ESP_CMD_DMA | ESP_CMD_TI);
1725 esp_event(esp, ESP_EVENT_DATA_DONE);
1726 break;
1727 }
1728 case ESP_EVENT_DATA_DONE: {
1729 struct esp_cmd_entry *ent = esp->active_cmd;
1730 struct scsi_cmnd *cmd = ent->cmd;
1731 int bytes_sent;
1732
1733 if (esp->ops->dma_error(esp)) {
1734 printk("ESP: data done, DMA error, resetting\n");
1735 esp_schedule_reset(esp);
1736 return 0;
1737 }
1738
1739 if (ent->flags & ESP_CMD_FLAG_WRITE) {
1740 /* XXX parity errors, etc. XXX */
1741
1742 esp->ops->dma_drain(esp);
1743 }
1744 esp->ops->dma_invalidate(esp);
1745
1746 if (esp->ireg != ESP_INTR_BSERV) {
1747 /* We should always see exactly a bus-service
1748 * interrupt at the end of a successful transfer.
1749 */
1750 printk("ESP: data done, not BSERV, resetting\n");
1751 esp_schedule_reset(esp);
1752 return 0;
1753 }
1754
1755 bytes_sent = esp_data_bytes_sent(esp, ent, cmd);
1756
1757 esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n",
1758 ent->flags, bytes_sent);
1759
1760 if (bytes_sent < 0) {
1761 /* XXX force sync mode for this target XXX */
1762 esp_schedule_reset(esp);
1763 return 0;
1764 }
1765
1766 esp_advance_dma(esp, ent, cmd, bytes_sent);
1767 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1768 goto again;
1769 }
1770
1771 case ESP_EVENT_STATUS: {
1772 struct esp_cmd_entry *ent = esp->active_cmd;
1773
1774 if (esp->ireg & ESP_INTR_FDONE) {
1775 ent->status = esp_read8(ESP_FDATA);
1776 ent->message = esp_read8(ESP_FDATA);
1777 scsi_esp_cmd(esp, ESP_CMD_MOK);
1778 } else if (esp->ireg == ESP_INTR_BSERV) {
1779 ent->status = esp_read8(ESP_FDATA);
1780 ent->message = 0xff;
1781 esp_event(esp, ESP_EVENT_MSGIN);
1782 return 0;
1783 }
1784
1785 if (ent->message != COMMAND_COMPLETE) {
1786 printk("ESP: Unexpected message %x in status\n",
1787 ent->message);
1788 esp_schedule_reset(esp);
1789 return 0;
1790 }
1791
1792 esp_event(esp, ESP_EVENT_FREE_BUS);
1793 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1794 break;
1795 }
1796 case ESP_EVENT_FREE_BUS: {
1797 struct esp_cmd_entry *ent = esp->active_cmd;
1798 struct scsi_cmnd *cmd = ent->cmd;
1799
1800 if (ent->message == COMMAND_COMPLETE ||
1801 ent->message == DISCONNECT)
1802 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1803
1804 if (ent->message == COMMAND_COMPLETE) {
1805 esp_log_cmddone("ESP: Command done status[%x] "
1806 "message[%x]\n",
1807 ent->status, ent->message);
1808 if (ent->status == SAM_STAT_TASK_SET_FULL)
1809 esp_event_queue_full(esp, ent);
1810
1811 if (ent->status == SAM_STAT_CHECK_CONDITION &&
1812 !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1813 ent->flags |= ESP_CMD_FLAG_AUTOSENSE;
1814 esp_autosense(esp, ent);
1815 } else {
1816 esp_cmd_is_done(esp, ent, cmd,
1817 compose_result(ent->status,
1818 ent->message,
1819 DID_OK));
1820 }
1821 } else if (ent->message == DISCONNECT) {
1822 esp_log_disconnect("ESP: Disconnecting tgt[%d] "
1823 "tag[%x:%x]\n",
1824 cmd->device->id,
1825 ent->tag[0], ent->tag[1]);
1826
1827 esp->active_cmd = NULL;
1828 esp_maybe_execute_command(esp);
1829 } else {
1830 printk("ESP: Unexpected message %x in freebus\n",
1831 ent->message);
1832 esp_schedule_reset(esp);
1833 return 0;
1834 }
1835 if (esp->active_cmd)
1836 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1837 break;
1838 }
1839 case ESP_EVENT_MSGOUT: {
1840 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1841
1842 if (esp_debug & ESP_DEBUG_MSGOUT) {
1843 int i;
1844 printk("ESP: Sending message [ ");
1845 for (i = 0; i < esp->msg_out_len; i++)
1846 printk("%02x ", esp->msg_out[i]);
1847 printk("]\n");
1848 }
1849
1850 if (esp->rev == FASHME) {
1851 int i;
1852
1853 /* Always use the fifo. */
1854 for (i = 0; i < esp->msg_out_len; i++) {
1855 esp_write8(esp->msg_out[i], ESP_FDATA);
1856 esp_write8(0, ESP_FDATA);
1857 }
1858 scsi_esp_cmd(esp, ESP_CMD_TI);
1859 } else {
1860 if (esp->msg_out_len == 1) {
1861 esp_write8(esp->msg_out[0], ESP_FDATA);
1862 scsi_esp_cmd(esp, ESP_CMD_TI);
1863 } else {
1864 /* Use DMA. */
1865 memcpy(esp->command_block,
1866 esp->msg_out,
1867 esp->msg_out_len);
1868
1869 esp->ops->send_dma_cmd(esp,
1870 esp->command_block_dma,
1871 esp->msg_out_len,
1872 esp->msg_out_len,
1873 0,
1874 ESP_CMD_DMA|ESP_CMD_TI);
1875 }
1876 }
1877 esp_event(esp, ESP_EVENT_MSGOUT_DONE);
1878 break;
1879 }
1880 case ESP_EVENT_MSGOUT_DONE:
1881 if (esp->rev == FASHME) {
1882 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1883 } else {
1884 if (esp->msg_out_len > 1)
1885 esp->ops->dma_invalidate(esp);
1886 }
1887
1888 if (!(esp->ireg & ESP_INTR_DC)) {
1889 if (esp->rev != FASHME)
1890 scsi_esp_cmd(esp, ESP_CMD_NULL);
1891 }
1892 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1893 goto again;
1894 case ESP_EVENT_MSGIN:
1895 if (esp->ireg & ESP_INTR_BSERV) {
1896 if (esp->rev == FASHME) {
1897 if (!(esp_read8(ESP_STATUS2) &
1898 ESP_STAT2_FEMPTY))
1899 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1900 } else {
1901 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1902 if (esp->rev == ESP100)
1903 scsi_esp_cmd(esp, ESP_CMD_NULL);
1904 }
1905 scsi_esp_cmd(esp, ESP_CMD_TI);
1906 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1907 return 1;
1908 }
1909 if (esp->ireg & ESP_INTR_FDONE) {
1910 u8 val;
1911
1912 if (esp->rev == FASHME)
1913 val = esp->fifo[0];
1914 else
1915 val = esp_read8(ESP_FDATA);
1916 esp->msg_in[esp->msg_in_len++] = val;
1917
1918 esp_log_msgin("ESP: Got msgin byte %x\n", val);
1919
1920 if (!esp_msgin_process(esp))
1921 esp->msg_in_len = 0;
1922
1923 if (esp->rev == FASHME)
1924 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1925
1926 scsi_esp_cmd(esp, ESP_CMD_MOK);
1927
1928 if (esp->event != ESP_EVENT_FREE_BUS)
1929 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1930 } else {
1931 printk("ESP: MSGIN neither BSERV not FDON, resetting");
1932 esp_schedule_reset(esp);
1933 return 0;
1934 }
1935 break;
1936 case ESP_EVENT_CMD_START:
1937 memcpy(esp->command_block, esp->cmd_bytes_ptr,
1938 esp->cmd_bytes_left);
1939 if (esp->rev == FASHME)
1940 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1941 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1942 esp->cmd_bytes_left, 16, 0,
1943 ESP_CMD_DMA | ESP_CMD_TI);
1944 esp_event(esp, ESP_EVENT_CMD_DONE);
1945 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1946 break;
1947 case ESP_EVENT_CMD_DONE:
1948 esp->ops->dma_invalidate(esp);
1949 if (esp->ireg & ESP_INTR_BSERV) {
1950 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1951 goto again;
1952 }
1953 esp_schedule_reset(esp);
1954 return 0;
1955 break;
1956
1957 case ESP_EVENT_RESET:
1958 scsi_esp_cmd(esp, ESP_CMD_RS);
1959 break;
1960
1961 default:
1962 printk("ESP: Unexpected event %x, resetting\n",
1963 esp->event);
1964 esp_schedule_reset(esp);
1965 return 0;
1966 break;
1967 }
1968 return 1;
1969 }
1970
1971 static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent)
1972 {
1973 struct scsi_cmnd *cmd = ent->cmd;
1974
1975 esp_unmap_dma(esp, cmd);
1976 esp_free_lun_tag(ent, cmd->device->hostdata);
1977 cmd->result = DID_RESET << 16;
1978
1979 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
1980 esp->ops->unmap_single(esp, ent->sense_dma,
1981 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1982 ent->sense_ptr = NULL;
1983 }
1984
1985 cmd->scsi_done(cmd);
1986 list_del(&ent->list);
1987 esp_put_ent(esp, ent);
1988 }
1989
1990 static void esp_clear_hold(struct scsi_device *dev, void *data)
1991 {
1992 struct esp_lun_data *lp = dev->hostdata;
1993
1994 BUG_ON(lp->num_tagged);
1995 lp->hold = 0;
1996 }
1997
1998 static void esp_reset_cleanup(struct esp *esp)
1999 {
2000 struct esp_cmd_entry *ent, *tmp;
2001 int i;
2002
2003 list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) {
2004 struct scsi_cmnd *cmd = ent->cmd;
2005
2006 list_del(&ent->list);
2007 cmd->result = DID_RESET << 16;
2008 cmd->scsi_done(cmd);
2009 esp_put_ent(esp, ent);
2010 }
2011
2012 list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) {
2013 if (ent == esp->active_cmd)
2014 esp->active_cmd = NULL;
2015 esp_reset_cleanup_one(esp, ent);
2016 }
2017
2018 BUG_ON(esp->active_cmd != NULL);
2019
2020 /* Force renegotiation of sync/wide transfers. */
2021 for (i = 0; i < ESP_MAX_TARGET; i++) {
2022 struct esp_target_data *tp = &esp->target[i];
2023
2024 tp->esp_period = 0;
2025 tp->esp_offset = 0;
2026 tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE |
2027 ESP_CONFIG3_FSCSI |
2028 ESP_CONFIG3_FAST);
2029 tp->flags &= ~ESP_TGT_WIDE;
2030 tp->flags |= ESP_TGT_CHECK_NEGO;
2031
2032 if (tp->starget)
2033 __starget_for_each_device(tp->starget, NULL,
2034 esp_clear_hold);
2035 }
2036 esp->flags &= ~ESP_FLAG_RESETTING;
2037 }
2038
2039 /* Runs under host->lock */
2040 static void __esp_interrupt(struct esp *esp)
2041 {
2042 int finish_reset, intr_done;
2043 u8 phase;
2044
2045 esp->sreg = esp_read8(ESP_STATUS);
2046
2047 if (esp->flags & ESP_FLAG_RESETTING) {
2048 finish_reset = 1;
2049 } else {
2050 if (esp_check_gross_error(esp))
2051 return;
2052
2053 finish_reset = esp_check_spur_intr(esp);
2054 if (finish_reset < 0)
2055 return;
2056 }
2057
2058 esp->ireg = esp_read8(ESP_INTRPT);
2059
2060 if (esp->ireg & ESP_INTR_SR)
2061 finish_reset = 1;
2062
2063 if (finish_reset) {
2064 esp_reset_cleanup(esp);
2065 if (esp->eh_reset) {
2066 complete(esp->eh_reset);
2067 esp->eh_reset = NULL;
2068 }
2069 return;
2070 }
2071
2072 phase = (esp->sreg & ESP_STAT_PMASK);
2073 if (esp->rev == FASHME) {
2074 if (((phase != ESP_DIP && phase != ESP_DOP) &&
2075 esp->select_state == ESP_SELECT_NONE &&
2076 esp->event != ESP_EVENT_STATUS &&
2077 esp->event != ESP_EVENT_DATA_DONE) ||
2078 (esp->ireg & ESP_INTR_RSEL)) {
2079 esp->sreg2 = esp_read8(ESP_STATUS2);
2080 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2081 (esp->sreg2 & ESP_STAT2_F1BYTE))
2082 hme_read_fifo(esp);
2083 }
2084 }
2085
2086 esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] "
2087 "sreg2[%02x] ireg[%02x]\n",
2088 esp->sreg, esp->seqreg, esp->sreg2, esp->ireg);
2089
2090 intr_done = 0;
2091
2092 if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) {
2093 printk("ESP: unexpected IREG %02x\n", esp->ireg);
2094 if (esp->ireg & ESP_INTR_IC)
2095 esp_dump_cmd_log(esp);
2096
2097 esp_schedule_reset(esp);
2098 } else {
2099 if (!(esp->ireg & ESP_INTR_RSEL)) {
2100 /* Some combination of FDONE, BSERV, DC. */
2101 if (esp->select_state != ESP_SELECT_NONE)
2102 intr_done = esp_finish_select(esp);
2103 } else if (esp->ireg & ESP_INTR_RSEL) {
2104 if (esp->active_cmd)
2105 (void) esp_finish_select(esp);
2106 intr_done = esp_reconnect(esp);
2107 }
2108 }
2109 while (!intr_done)
2110 intr_done = esp_process_event(esp);
2111 }
2112
2113 irqreturn_t scsi_esp_intr(int irq, void *dev_id)
2114 {
2115 struct esp *esp = dev_id;
2116 unsigned long flags;
2117 irqreturn_t ret;
2118
2119 spin_lock_irqsave(esp->host->host_lock, flags);
2120 ret = IRQ_NONE;
2121 if (esp->ops->irq_pending(esp)) {
2122 ret = IRQ_HANDLED;
2123 for (;;) {
2124 int i;
2125
2126 __esp_interrupt(esp);
2127 if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK))
2128 break;
2129 esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK;
2130
2131 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
2132 if (esp->ops->irq_pending(esp))
2133 break;
2134 }
2135 if (i == ESP_QUICKIRQ_LIMIT)
2136 break;
2137 }
2138 }
2139 spin_unlock_irqrestore(esp->host->host_lock, flags);
2140
2141 return ret;
2142 }
2143 EXPORT_SYMBOL(scsi_esp_intr);
2144
2145 static void esp_get_revision(struct esp *esp)
2146 {
2147 u8 val;
2148
2149 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
2150 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
2151 esp_write8(esp->config2, ESP_CFG2);
2152
2153 val = esp_read8(ESP_CFG2);
2154 val &= ~ESP_CONFIG2_MAGIC;
2155 if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
2156 /* If what we write to cfg2 does not come back, cfg2 is not
2157 * implemented, therefore this must be a plain esp100.
2158 */
2159 esp->rev = ESP100;
2160 } else {
2161 esp->config2 = 0;
2162 esp_set_all_config3(esp, 5);
2163 esp->prev_cfg3 = 5;
2164 esp_write8(esp->config2, ESP_CFG2);
2165 esp_write8(0, ESP_CFG3);
2166 esp_write8(esp->prev_cfg3, ESP_CFG3);
2167
2168 val = esp_read8(ESP_CFG3);
2169 if (val != 5) {
2170 /* The cfg2 register is implemented, however
2171 * cfg3 is not, must be esp100a.
2172 */
2173 esp->rev = ESP100A;
2174 } else {
2175 esp_set_all_config3(esp, 0);
2176 esp->prev_cfg3 = 0;
2177 esp_write8(esp->prev_cfg3, ESP_CFG3);
2178
2179 /* All of cfg{1,2,3} implemented, must be one of
2180 * the fas variants, figure out which one.
2181 */
2182 if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) {
2183 esp->rev = FAST;
2184 esp->sync_defp = SYNC_DEFP_FAST;
2185 } else {
2186 esp->rev = ESP236;
2187 }
2188 esp->config2 = 0;
2189 esp_write8(esp->config2, ESP_CFG2);
2190 }
2191 }
2192 }
2193
2194 static void esp_init_swstate(struct esp *esp)
2195 {
2196 int i;
2197
2198 INIT_LIST_HEAD(&esp->queued_cmds);
2199 INIT_LIST_HEAD(&esp->active_cmds);
2200 INIT_LIST_HEAD(&esp->esp_cmd_pool);
2201
2202 /* Start with a clear state, domain validation (via ->slave_configure,
2203 * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged
2204 * commands.
2205 */
2206 for (i = 0 ; i < ESP_MAX_TARGET; i++) {
2207 esp->target[i].flags = 0;
2208 esp->target[i].nego_goal_period = 0;
2209 esp->target[i].nego_goal_offset = 0;
2210 esp->target[i].nego_goal_width = 0;
2211 esp->target[i].nego_goal_tags = 0;
2212 }
2213 }
2214
2215 /* This places the ESP into a known state at boot time. */
2216 static void esp_bootup_reset(struct esp *esp)
2217 {
2218 u8 val;
2219
2220 /* Reset the DMA */
2221 esp->ops->reset_dma(esp);
2222
2223 /* Reset the ESP */
2224 esp_reset_esp(esp);
2225
2226 /* Reset the SCSI bus, but tell ESP not to generate an irq */
2227 val = esp_read8(ESP_CFG1);
2228 val |= ESP_CONFIG1_SRRDISAB;
2229 esp_write8(val, ESP_CFG1);
2230
2231 scsi_esp_cmd(esp, ESP_CMD_RS);
2232 udelay(400);
2233
2234 esp_write8(esp->config1, ESP_CFG1);
2235
2236 /* Eat any bitrot in the chip and we are done... */
2237 esp_read8(ESP_INTRPT);
2238 }
2239
2240 static void esp_set_clock_params(struct esp *esp)
2241 {
2242 int fhz;
2243 u8 ccf;
2244
2245 /* This is getting messy but it has to be done correctly or else
2246 * you get weird behavior all over the place. We are trying to
2247 * basically figure out three pieces of information.
2248 *
2249 * a) Clock Conversion Factor
2250 *
2251 * This is a representation of the input crystal clock frequency
2252 * going into the ESP on this machine. Any operation whose timing
2253 * is longer than 400ns depends on this value being correct. For
2254 * example, you'll get blips for arbitration/selection during high
2255 * load or with multiple targets if this is not set correctly.
2256 *
2257 * b) Selection Time-Out
2258 *
2259 * The ESP isn't very bright and will arbitrate for the bus and try
2260 * to select a target forever if you let it. This value tells the
2261 * ESP when it has taken too long to negotiate and that it should
2262 * interrupt the CPU so we can see what happened. The value is
2263 * computed as follows (from NCR/Symbios chip docs).
2264 *
2265 * (Time Out Period) * (Input Clock)
2266 * STO = ----------------------------------
2267 * (8192) * (Clock Conversion Factor)
2268 *
2269 * We use a time out period of 250ms (ESP_BUS_TIMEOUT).
2270 *
2271 * c) Imperical constants for synchronous offset and transfer period
2272 * register values
2273 *
2274 * This entails the smallest and largest sync period we could ever
2275 * handle on this ESP.
2276 */
2277 fhz = esp->cfreq;
2278
2279 ccf = ((fhz / 1000000) + 4) / 5;
2280 if (ccf == 1)
2281 ccf = 2;
2282
2283 /* If we can't find anything reasonable, just assume 20MHZ.
2284 * This is the clock frequency of the older sun4c's where I've
2285 * been unable to find the clock-frequency PROM property. All
2286 * other machines provide useful values it seems.
2287 */
2288 if (fhz <= 5000000 || ccf < 1 || ccf > 8) {
2289 fhz = 20000000;
2290 ccf = 4;
2291 }
2292
2293 esp->cfact = (ccf == 8 ? 0 : ccf);
2294 esp->cfreq = fhz;
2295 esp->ccycle = ESP_HZ_TO_CYCLE(fhz);
2296 esp->ctick = ESP_TICK(ccf, esp->ccycle);
2297 esp->neg_defp = ESP_NEG_DEFP(fhz, ccf);
2298 esp->sync_defp = SYNC_DEFP_SLOW;
2299 }
2300
2301 static const char *esp_chip_names[] = {
2302 "ESP100",
2303 "ESP100A",
2304 "ESP236",
2305 "FAS236",
2306 "FAS100A",
2307 "FAST",
2308 "FASHME",
2309 };
2310
2311 static struct scsi_transport_template *esp_transport_template;
2312
2313 int scsi_esp_register(struct esp *esp, struct device *dev)
2314 {
2315 static int instance;
2316 int err;
2317
2318 esp->host->transportt = esp_transport_template;
2319 esp->host->max_lun = ESP_MAX_LUN;
2320 esp->host->cmd_per_lun = 2;
2321 esp->host->unique_id = instance;
2322
2323 esp_set_clock_params(esp);
2324
2325 esp_get_revision(esp);
2326
2327 esp_init_swstate(esp);
2328
2329 esp_bootup_reset(esp);
2330
2331 printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n",
2332 esp->host->unique_id, esp->regs, esp->dma_regs,
2333 esp->host->irq);
2334 printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n",
2335 esp->host->unique_id, esp_chip_names[esp->rev],
2336 esp->cfreq / 1000000, esp->cfact, esp->scsi_id);
2337
2338 /* Let the SCSI bus reset settle. */
2339 ssleep(esp_bus_reset_settle);
2340
2341 err = scsi_add_host(esp->host, dev);
2342 if (err)
2343 return err;
2344
2345 instance++;
2346
2347 scsi_scan_host(esp->host);
2348
2349 return 0;
2350 }
2351 EXPORT_SYMBOL(scsi_esp_register);
2352
2353 void scsi_esp_unregister(struct esp *esp)
2354 {
2355 scsi_remove_host(esp->host);
2356 }
2357 EXPORT_SYMBOL(scsi_esp_unregister);
2358
2359 static int esp_target_alloc(struct scsi_target *starget)
2360 {
2361 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2362 struct esp_target_data *tp = &esp->target[starget->id];
2363
2364 tp->starget = starget;
2365
2366 return 0;
2367 }
2368
2369 static void esp_target_destroy(struct scsi_target *starget)
2370 {
2371 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2372 struct esp_target_data *tp = &esp->target[starget->id];
2373
2374 tp->starget = NULL;
2375 }
2376
2377 static int esp_slave_alloc(struct scsi_device *dev)
2378 {
2379 struct esp *esp = shost_priv(dev->host);
2380 struct esp_target_data *tp = &esp->target[dev->id];
2381 struct esp_lun_data *lp;
2382
2383 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
2384 if (!lp)
2385 return -ENOMEM;
2386 dev->hostdata = lp;
2387
2388 spi_min_period(tp->starget) = esp->min_period;
2389 spi_max_offset(tp->starget) = 15;
2390
2391 if (esp->flags & ESP_FLAG_WIDE_CAPABLE)
2392 spi_max_width(tp->starget) = 1;
2393 else
2394 spi_max_width(tp->starget) = 0;
2395
2396 return 0;
2397 }
2398
2399 static int esp_slave_configure(struct scsi_device *dev)
2400 {
2401 struct esp *esp = shost_priv(dev->host);
2402 struct esp_target_data *tp = &esp->target[dev->id];
2403 int goal_tags, queue_depth;
2404
2405 goal_tags = 0;
2406
2407 if (dev->tagged_supported) {
2408 /* XXX make this configurable somehow XXX */
2409 goal_tags = ESP_DEFAULT_TAGS;
2410
2411 if (goal_tags > ESP_MAX_TAG)
2412 goal_tags = ESP_MAX_TAG;
2413 }
2414
2415 queue_depth = goal_tags;
2416 if (queue_depth < dev->host->cmd_per_lun)
2417 queue_depth = dev->host->cmd_per_lun;
2418
2419 if (goal_tags) {
2420 scsi_set_tag_type(dev, MSG_ORDERED_TAG);
2421 scsi_activate_tcq(dev, queue_depth);
2422 } else {
2423 scsi_deactivate_tcq(dev, queue_depth);
2424 }
2425 tp->flags |= ESP_TGT_DISCONNECT;
2426
2427 if (!spi_initial_dv(dev->sdev_target))
2428 spi_dv_device(dev);
2429
2430 return 0;
2431 }
2432
2433 static void esp_slave_destroy(struct scsi_device *dev)
2434 {
2435 struct esp_lun_data *lp = dev->hostdata;
2436
2437 kfree(lp);
2438 dev->hostdata = NULL;
2439 }
2440
2441 static int esp_eh_abort_handler(struct scsi_cmnd *cmd)
2442 {
2443 struct esp *esp = shost_priv(cmd->device->host);
2444 struct esp_cmd_entry *ent, *tmp;
2445 struct completion eh_done;
2446 unsigned long flags;
2447
2448 /* XXX This helps a lot with debugging but might be a bit
2449 * XXX much for the final driver.
2450 */
2451 spin_lock_irqsave(esp->host->host_lock, flags);
2452 printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n",
2453 esp->host->unique_id, cmd, cmd->cmnd[0]);
2454 ent = esp->active_cmd;
2455 if (ent)
2456 printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n",
2457 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2458 list_for_each_entry(ent, &esp->queued_cmds, list) {
2459 printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n",
2460 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2461 }
2462 list_for_each_entry(ent, &esp->active_cmds, list) {
2463 printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n",
2464 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2465 }
2466 esp_dump_cmd_log(esp);
2467 spin_unlock_irqrestore(esp->host->host_lock, flags);
2468
2469 spin_lock_irqsave(esp->host->host_lock, flags);
2470
2471 ent = NULL;
2472 list_for_each_entry(tmp, &esp->queued_cmds, list) {
2473 if (tmp->cmd == cmd) {
2474 ent = tmp;
2475 break;
2476 }
2477 }
2478
2479 if (ent) {
2480 /* Easiest case, we didn't even issue the command
2481 * yet so it is trivial to abort.
2482 */
2483 list_del(&ent->list);
2484
2485 cmd->result = DID_ABORT << 16;
2486 cmd->scsi_done(cmd);
2487
2488 esp_put_ent(esp, ent);
2489
2490 goto out_success;
2491 }
2492
2493 init_completion(&eh_done);
2494
2495 ent = esp->active_cmd;
2496 if (ent && ent->cmd == cmd) {
2497 /* Command is the currently active command on
2498 * the bus. If we already have an output message
2499 * pending, no dice.
2500 */
2501 if (esp->msg_out_len)
2502 goto out_failure;
2503
2504 /* Send out an abort, encouraging the target to
2505 * go to MSGOUT phase by asserting ATN.
2506 */
2507 esp->msg_out[0] = ABORT_TASK_SET;
2508 esp->msg_out_len = 1;
2509 ent->eh_done = &eh_done;
2510
2511 scsi_esp_cmd(esp, ESP_CMD_SATN);
2512 } else {
2513 /* The command is disconnected. This is not easy to
2514 * abort. For now we fail and let the scsi error
2515 * handling layer go try a scsi bus reset or host
2516 * reset.
2517 *
2518 * What we could do is put together a scsi command
2519 * solely for the purpose of sending an abort message
2520 * to the target. Coming up with all the code to
2521 * cook up scsi commands, special case them everywhere,
2522 * etc. is for questionable gain and it would be better
2523 * if the generic scsi error handling layer could do at
2524 * least some of that for us.
2525 *
2526 * Anyways this is an area for potential future improvement
2527 * in this driver.
2528 */
2529 goto out_failure;
2530 }
2531
2532 spin_unlock_irqrestore(esp->host->host_lock, flags);
2533
2534 if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) {
2535 spin_lock_irqsave(esp->host->host_lock, flags);
2536 ent->eh_done = NULL;
2537 spin_unlock_irqrestore(esp->host->host_lock, flags);
2538
2539 return FAILED;
2540 }
2541
2542 return SUCCESS;
2543
2544 out_success:
2545 spin_unlock_irqrestore(esp->host->host_lock, flags);
2546 return SUCCESS;
2547
2548 out_failure:
2549 /* XXX This might be a good location to set ESP_TGT_BROKEN
2550 * XXX since we know which target/lun in particular is
2551 * XXX causing trouble.
2552 */
2553 spin_unlock_irqrestore(esp->host->host_lock, flags);
2554 return FAILED;
2555 }
2556
2557 static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd)
2558 {
2559 struct esp *esp = shost_priv(cmd->device->host);
2560 struct completion eh_reset;
2561 unsigned long flags;
2562
2563 init_completion(&eh_reset);
2564
2565 spin_lock_irqsave(esp->host->host_lock, flags);
2566
2567 esp->eh_reset = &eh_reset;
2568
2569 /* XXX This is too simple... We should add lots of
2570 * XXX checks here so that if we find that the chip is
2571 * XXX very wedged we return failure immediately so
2572 * XXX that we can perform a full chip reset.
2573 */
2574 esp->flags |= ESP_FLAG_RESETTING;
2575 scsi_esp_cmd(esp, ESP_CMD_RS);
2576
2577 spin_unlock_irqrestore(esp->host->host_lock, flags);
2578
2579 ssleep(esp_bus_reset_settle);
2580
2581 if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) {
2582 spin_lock_irqsave(esp->host->host_lock, flags);
2583 esp->eh_reset = NULL;
2584 spin_unlock_irqrestore(esp->host->host_lock, flags);
2585
2586 return FAILED;
2587 }
2588
2589 return SUCCESS;
2590 }
2591
2592 /* All bets are off, reset the entire device. */
2593 static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd)
2594 {
2595 struct esp *esp = shost_priv(cmd->device->host);
2596 unsigned long flags;
2597
2598 spin_lock_irqsave(esp->host->host_lock, flags);
2599 esp_bootup_reset(esp);
2600 esp_reset_cleanup(esp);
2601 spin_unlock_irqrestore(esp->host->host_lock, flags);
2602
2603 ssleep(esp_bus_reset_settle);
2604
2605 return SUCCESS;
2606 }
2607
2608 static const char *esp_info(struct Scsi_Host *host)
2609 {
2610 return "esp";
2611 }
2612
2613 struct scsi_host_template scsi_esp_template = {
2614 .module = THIS_MODULE,
2615 .name = "esp",
2616 .info = esp_info,
2617 .queuecommand = esp_queuecommand,
2618 .target_alloc = esp_target_alloc,
2619 .target_destroy = esp_target_destroy,
2620 .slave_alloc = esp_slave_alloc,
2621 .slave_configure = esp_slave_configure,
2622 .slave_destroy = esp_slave_destroy,
2623 .eh_abort_handler = esp_eh_abort_handler,
2624 .eh_bus_reset_handler = esp_eh_bus_reset_handler,
2625 .eh_host_reset_handler = esp_eh_host_reset_handler,
2626 .can_queue = 7,
2627 .this_id = 7,
2628 .sg_tablesize = SG_ALL,
2629 .use_clustering = ENABLE_CLUSTERING,
2630 .max_sectors = 0xffff,
2631 .skip_settle_delay = 1,
2632 };
2633 EXPORT_SYMBOL(scsi_esp_template);
2634
2635 static void esp_get_signalling(struct Scsi_Host *host)
2636 {
2637 struct esp *esp = shost_priv(host);
2638 enum spi_signal_type type;
2639
2640 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
2641 type = SPI_SIGNAL_HVD;
2642 else
2643 type = SPI_SIGNAL_SE;
2644
2645 spi_signalling(host) = type;
2646 }
2647
2648 static void esp_set_offset(struct scsi_target *target, int offset)
2649 {
2650 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2651 struct esp *esp = shost_priv(host);
2652 struct esp_target_data *tp = &esp->target[target->id];
2653
2654 if (esp->flags & ESP_FLAG_DISABLE_SYNC)
2655 tp->nego_goal_offset = 0;
2656 else
2657 tp->nego_goal_offset = offset;
2658 tp->flags |= ESP_TGT_CHECK_NEGO;
2659 }
2660
2661 static void esp_set_period(struct scsi_target *target, int period)
2662 {
2663 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2664 struct esp *esp = shost_priv(host);
2665 struct esp_target_data *tp = &esp->target[target->id];
2666
2667 tp->nego_goal_period = period;
2668 tp->flags |= ESP_TGT_CHECK_NEGO;
2669 }
2670
2671 static void esp_set_width(struct scsi_target *target, int width)
2672 {
2673 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2674 struct esp *esp = shost_priv(host);
2675 struct esp_target_data *tp = &esp->target[target->id];
2676
2677 tp->nego_goal_width = (width ? 1 : 0);
2678 tp->flags |= ESP_TGT_CHECK_NEGO;
2679 }
2680
2681 static struct spi_function_template esp_transport_ops = {
2682 .set_offset = esp_set_offset,
2683 .show_offset = 1,
2684 .set_period = esp_set_period,
2685 .show_period = 1,
2686 .set_width = esp_set_width,
2687 .show_width = 1,
2688 .get_signalling = esp_get_signalling,
2689 };
2690
2691 static int __init esp_init(void)
2692 {
2693 BUILD_BUG_ON(sizeof(struct scsi_pointer) <
2694 sizeof(struct esp_cmd_priv));
2695
2696 esp_transport_template = spi_attach_transport(&esp_transport_ops);
2697 if (!esp_transport_template)
2698 return -ENODEV;
2699
2700 return 0;
2701 }
2702
2703 static void __exit esp_exit(void)
2704 {
2705 spi_release_transport(esp_transport_template);
2706 }
2707
2708 MODULE_DESCRIPTION("ESP SCSI driver core");
2709 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
2710 MODULE_LICENSE("GPL");
2711 MODULE_VERSION(DRV_VERSION);
2712
2713 module_param(esp_bus_reset_settle, int, 0);
2714 MODULE_PARM_DESC(esp_bus_reset_settle,
2715 "ESP scsi bus reset delay in seconds");
2716
2717 module_param(esp_debug, int, 0);
2718 MODULE_PARM_DESC(esp_debug,
2719 "ESP bitmapped debugging message enable value:\n"
2720 " 0x00000001 Log interrupt events\n"
2721 " 0x00000002 Log scsi commands\n"
2722 " 0x00000004 Log resets\n"
2723 " 0x00000008 Log message in events\n"
2724 " 0x00000010 Log message out events\n"
2725 " 0x00000020 Log command completion\n"
2726 " 0x00000040 Log disconnects\n"
2727 " 0x00000080 Log data start\n"
2728 " 0x00000100 Log data done\n"
2729 " 0x00000200 Log reconnects\n"
2730 " 0x00000400 Log auto-sense data\n"
2731 );
2732
2733 module_init(esp_init);
2734 module_exit(esp_exit);