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md: Fix unfortunate interaction with evms
[linux-2.6/mini2440.git] / drivers / scsi / esp_scsi.c
bloba680e18b5f3b9eac57b879b5c988aff38c13d6ef
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_del(&ent->list);
712 list_add(&ent->list, &esp->active_cmds);
713
714 esp->active_cmd = ent;
715
716 esp_map_dma(esp, cmd);
717 esp_save_pointers(esp, ent);
718
719 esp_check_command_len(esp, cmd);
720
721 p = esp->command_block;
722
723 esp->msg_out_len = 0;
724 if (tp->flags & ESP_TGT_CHECK_NEGO) {
725 /* Need to negotiate. If the target is broken
726 * go for synchronous transfers and non-wide.
727 */
728 if (tp->flags & ESP_TGT_BROKEN) {
729 tp->flags &= ~ESP_TGT_DISCONNECT;
730 tp->nego_goal_period = 0;
731 tp->nego_goal_offset = 0;
732 tp->nego_goal_width = 0;
733 tp->nego_goal_tags = 0;
734 }
735
736 /* If the settings are not changing, skip this. */
737 if (spi_width(tp->starget) == tp->nego_goal_width &&
738 spi_period(tp->starget) == tp->nego_goal_period &&
739 spi_offset(tp->starget) == tp->nego_goal_offset) {
740 tp->flags &= ~ESP_TGT_CHECK_NEGO;
741 goto build_identify;
742 }
743
744 if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) {
745 esp->msg_out_len =
746 spi_populate_width_msg(&esp->msg_out[0],
747 (tp->nego_goal_width ?
748 1 : 0));
749 tp->flags |= ESP_TGT_NEGO_WIDE;
750 } else if (esp_need_to_nego_sync(tp)) {
751 esp->msg_out_len =
752 spi_populate_sync_msg(&esp->msg_out[0],
753 tp->nego_goal_period,
754 tp->nego_goal_offset);
755 tp->flags |= ESP_TGT_NEGO_SYNC;
756 } else {
757 tp->flags &= ~ESP_TGT_CHECK_NEGO;
758 }
759
760 /* Process it like a slow command. */
761 if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC))
762 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
763 }
764
765 build_identify:
766 /* If we don't have a lun-data struct yet, we're probing
767 * so do not disconnect. Also, do not disconnect unless
768 * we have a tag on this command.
769 */
770 if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0])
771 *p++ = IDENTIFY(1, lun);
772 else
773 *p++ = IDENTIFY(0, lun);
774
775 if (ent->tag[0] && esp->rev == ESP100) {
776 /* ESP100 lacks select w/atn3 command, use select
777 * and stop instead.
778 */
779 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
780 }
781
782 if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) {
783 start_cmd = ESP_CMD_DMA | ESP_CMD_SELA;
784 if (ent->tag[0]) {
785 *p++ = ent->tag[0];
786 *p++ = ent->tag[1];
787
788 start_cmd = ESP_CMD_DMA | ESP_CMD_SA3;
789 }
790
791 for (i = 0; i < cmd->cmd_len; i++)
792 *p++ = cmd->cmnd[i];
793
794 esp->select_state = ESP_SELECT_BASIC;
795 } else {
796 esp->cmd_bytes_left = cmd->cmd_len;
797 esp->cmd_bytes_ptr = &cmd->cmnd[0];
798
799 if (ent->tag[0]) {
800 for (i = esp->msg_out_len - 1;
801 i >= 0; i--)
802 esp->msg_out[i + 2] = esp->msg_out[i];
803 esp->msg_out[0] = ent->tag[0];
804 esp->msg_out[1] = ent->tag[1];
805 esp->msg_out_len += 2;
806 }
807
808 start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS;
809 esp->select_state = ESP_SELECT_MSGOUT;
810 }
811 val = tgt;
812 if (esp->rev == FASHME)
813 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
814 esp_write8(val, ESP_BUSID);
815
816 esp_write_tgt_sync(esp, tgt);
817 esp_write_tgt_config3(esp, tgt);
818
819 val = (p - esp->command_block);
820
821 if (esp_debug & ESP_DEBUG_SCSICMD) {
822 printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun);
823 for (i = 0; i < cmd->cmd_len; i++)
824 printk("%02x ", cmd->cmnd[i]);
825 printk("]\n");
826 }
827
828 if (esp->rev == FASHME)
829 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
830 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
831 val, 16, 0, start_cmd);
832 }
833
834 static struct esp_cmd_entry *esp_get_ent(struct esp *esp)
835 {
836 struct list_head *head = &esp->esp_cmd_pool;
837 struct esp_cmd_entry *ret;
838
839 if (list_empty(head)) {
840 ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC);
841 } else {
842 ret = list_entry(head->next, struct esp_cmd_entry, list);
843 list_del(&ret->list);
844 memset(ret, 0, sizeof(*ret));
845 }
846 return ret;
847 }
848
849 static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent)
850 {
851 list_add(&ent->list, &esp->esp_cmd_pool);
852 }
853
854 static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent,
855 struct scsi_cmnd *cmd, unsigned int result)
856 {
857 struct scsi_device *dev = cmd->device;
858 int tgt = dev->id;
859 int lun = dev->lun;
860
861 esp->active_cmd = NULL;
862 esp_unmap_dma(esp, cmd);
863 esp_free_lun_tag(ent, dev->hostdata);
864 cmd->result = result;
865
866 if (ent->eh_done) {
867 complete(ent->eh_done);
868 ent->eh_done = NULL;
869 }
870
871 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
872 esp->ops->unmap_single(esp, ent->sense_dma,
873 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
874 ent->sense_ptr = NULL;
875
876 /* Restore the message/status bytes to what we actually
877 * saw originally. Also, report that we are providing
878 * the sense data.
879 */
880 cmd->result = ((DRIVER_SENSE << 24) |
881 (DID_OK << 16) |
882 (COMMAND_COMPLETE << 8) |
883 (SAM_STAT_CHECK_CONDITION << 0));
884
885 ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE;
886 if (esp_debug & ESP_DEBUG_AUTOSENSE) {
887 int i;
888
889 printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ",
890 esp->host->unique_id, tgt, lun);
891 for (i = 0; i < 18; i++)
892 printk("%02x ", cmd->sense_buffer[i]);
893 printk("]\n");
894 }
895 }
896
897 cmd->scsi_done(cmd);
898
899 list_del(&ent->list);
900 esp_put_ent(esp, ent);
901
902 esp_maybe_execute_command(esp);
903 }
904
905 static unsigned int compose_result(unsigned int status, unsigned int message,
906 unsigned int driver_code)
907 {
908 return (status | (message << 8) | (driver_code << 16));
909 }
910
911 static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent)
912 {
913 struct scsi_device *dev = ent->cmd->device;
914 struct esp_lun_data *lp = dev->hostdata;
915
916 scsi_track_queue_full(dev, lp->num_tagged - 1);
917 }
918
919 static int esp_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
920 {
921 struct scsi_device *dev = cmd->device;
922 struct esp *esp = shost_priv(dev->host);
923 struct esp_cmd_priv *spriv;
924 struct esp_cmd_entry *ent;
925
926 ent = esp_get_ent(esp);
927 if (!ent)
928 return SCSI_MLQUEUE_HOST_BUSY;
929
930 ent->cmd = cmd;
931
932 cmd->scsi_done = done;
933
934 spriv = ESP_CMD_PRIV(cmd);
935 spriv->u.dma_addr = ~(dma_addr_t)0x0;
936
937 list_add_tail(&ent->list, &esp->queued_cmds);
938
939 esp_maybe_execute_command(esp);
940
941 return 0;
942 }
943
944 static int esp_check_gross_error(struct esp *esp)
945 {
946 if (esp->sreg & ESP_STAT_SPAM) {
947 /* Gross Error, could be one of:
948 * - top of fifo overwritten
949 * - top of command register overwritten
950 * - DMA programmed with wrong direction
951 * - improper phase change
952 */
953 printk(KERN_ERR PFX "esp%d: Gross error sreg[%02x]\n",
954 esp->host->unique_id, esp->sreg);
955 /* XXX Reset the chip. XXX */
956 return 1;
957 }
958 return 0;
959 }
960
961 static int esp_check_spur_intr(struct esp *esp)
962 {
963 switch (esp->rev) {
964 case ESP100:
965 case ESP100A:
966 /* The interrupt pending bit of the status register cannot
967 * be trusted on these revisions.
968 */
969 esp->sreg &= ~ESP_STAT_INTR;
970 break;
971
972 default:
973 if (!(esp->sreg & ESP_STAT_INTR)) {
974 esp->ireg = esp_read8(ESP_INTRPT);
975 if (esp->ireg & ESP_INTR_SR)
976 return 1;
977
978 /* If the DMA is indicating interrupt pending and the
979 * ESP is not, the only possibility is a DMA error.
980 */
981 if (!esp->ops->dma_error(esp)) {
982 printk(KERN_ERR PFX "esp%d: Spurious irq, "
983 "sreg=%02x.\n",
984 esp->host->unique_id, esp->sreg);
985 return -1;
986 }
987
988 printk(KERN_ERR PFX "esp%d: DMA error\n",
989 esp->host->unique_id);
990
991 /* XXX Reset the chip. XXX */
992 return -1;
993 }
994 break;
995 }
996
997 return 0;
998 }
999
1000 static void esp_schedule_reset(struct esp *esp)
1001 {
1002 esp_log_reset("ESP: esp_schedule_reset() from %p\n",
1003 __builtin_return_address(0));
1004 esp->flags |= ESP_FLAG_RESETTING;
1005 esp_event(esp, ESP_EVENT_RESET);
1006 }
1007
1008 /* In order to avoid having to add a special half-reconnected state
1009 * into the driver we just sit here and poll through the rest of
1010 * the reselection process to get the tag message bytes.
1011 */
1012 static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp,
1013 struct esp_lun_data *lp)
1014 {
1015 struct esp_cmd_entry *ent;
1016 int i;
1017
1018 if (!lp->num_tagged) {
1019 printk(KERN_ERR PFX "esp%d: Reconnect w/num_tagged==0\n",
1020 esp->host->unique_id);
1021 return NULL;
1022 }
1023
1024 esp_log_reconnect("ESP: reconnect tag, ");
1025
1026 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
1027 if (esp->ops->irq_pending(esp))
1028 break;
1029 }
1030 if (i == ESP_QUICKIRQ_LIMIT) {
1031 printk(KERN_ERR PFX "esp%d: Reconnect IRQ1 timeout\n",
1032 esp->host->unique_id);
1033 return NULL;
1034 }
1035
1036 esp->sreg = esp_read8(ESP_STATUS);
1037 esp->ireg = esp_read8(ESP_INTRPT);
1038
1039 esp_log_reconnect("IRQ(%d:%x:%x), ",
1040 i, esp->ireg, esp->sreg);
1041
1042 if (esp->ireg & ESP_INTR_DC) {
1043 printk(KERN_ERR PFX "esp%d: Reconnect, got disconnect.\n",
1044 esp->host->unique_id);
1045 return NULL;
1046 }
1047
1048 if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) {
1049 printk(KERN_ERR PFX "esp%d: Reconnect, not MIP sreg[%02x].\n",
1050 esp->host->unique_id, esp->sreg);
1051 return NULL;
1052 }
1053
1054 /* DMA in the tag bytes... */
1055 esp->command_block[0] = 0xff;
1056 esp->command_block[1] = 0xff;
1057 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1058 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI);
1059
1060 /* ACK the msssage. */
1061 scsi_esp_cmd(esp, ESP_CMD_MOK);
1062
1063 for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) {
1064 if (esp->ops->irq_pending(esp)) {
1065 esp->sreg = esp_read8(ESP_STATUS);
1066 esp->ireg = esp_read8(ESP_INTRPT);
1067 if (esp->ireg & ESP_INTR_FDONE)
1068 break;
1069 }
1070 udelay(1);
1071 }
1072 if (i == ESP_RESELECT_TAG_LIMIT) {
1073 printk(KERN_ERR PFX "esp%d: Reconnect IRQ2 timeout\n",
1074 esp->host->unique_id);
1075 return NULL;
1076 }
1077 esp->ops->dma_drain(esp);
1078 esp->ops->dma_invalidate(esp);
1079
1080 esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n",
1081 i, esp->ireg, esp->sreg,
1082 esp->command_block[0],
1083 esp->command_block[1]);
1084
1085 if (esp->command_block[0] < SIMPLE_QUEUE_TAG ||
1086 esp->command_block[0] > ORDERED_QUEUE_TAG) {
1087 printk(KERN_ERR PFX "esp%d: Reconnect, bad tag "
1088 "type %02x.\n",
1089 esp->host->unique_id, esp->command_block[0]);
1090 return NULL;
1091 }
1092
1093 ent = lp->tagged_cmds[esp->command_block[1]];
1094 if (!ent) {
1095 printk(KERN_ERR PFX "esp%d: Reconnect, no entry for "
1096 "tag %02x.\n",
1097 esp->host->unique_id, esp->command_block[1]);
1098 return NULL;
1099 }
1100
1101 return ent;
1102 }
1103
1104 static int esp_reconnect(struct esp *esp)
1105 {
1106 struct esp_cmd_entry *ent;
1107 struct esp_target_data *tp;
1108 struct esp_lun_data *lp;
1109 struct scsi_device *dev;
1110 int target, lun;
1111
1112 BUG_ON(esp->active_cmd);
1113 if (esp->rev == FASHME) {
1114 /* FASHME puts the target and lun numbers directly
1115 * into the fifo.
1116 */
1117 target = esp->fifo[0];
1118 lun = esp->fifo[1] & 0x7;
1119 } else {
1120 u8 bits = esp_read8(ESP_FDATA);
1121
1122 /* Older chips put the lun directly into the fifo, but
1123 * the target is given as a sample of the arbitration
1124 * lines on the bus at reselection time. So we should
1125 * see the ID of the ESP and the one reconnecting target
1126 * set in the bitmap.
1127 */
1128 if (!(bits & esp->scsi_id_mask))
1129 goto do_reset;
1130 bits &= ~esp->scsi_id_mask;
1131 if (!bits || (bits & (bits - 1)))
1132 goto do_reset;
1133
1134 target = ffs(bits) - 1;
1135 lun = (esp_read8(ESP_FDATA) & 0x7);
1136
1137 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1138 if (esp->rev == ESP100) {
1139 u8 ireg = esp_read8(ESP_INTRPT);
1140 /* This chip has a bug during reselection that can
1141 * cause a spurious illegal-command interrupt, which
1142 * we simply ACK here. Another possibility is a bus
1143 * reset so we must check for that.
1144 */
1145 if (ireg & ESP_INTR_SR)
1146 goto do_reset;
1147 }
1148 scsi_esp_cmd(esp, ESP_CMD_NULL);
1149 }
1150
1151 esp_write_tgt_sync(esp, target);
1152 esp_write_tgt_config3(esp, target);
1153
1154 scsi_esp_cmd(esp, ESP_CMD_MOK);
1155
1156 if (esp->rev == FASHME)
1157 esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT,
1158 ESP_BUSID);
1159
1160 tp = &esp->target[target];
1161 dev = __scsi_device_lookup_by_target(tp->starget, lun);
1162 if (!dev) {
1163 printk(KERN_ERR PFX "esp%d: Reconnect, no lp "
1164 "tgt[%u] lun[%u]\n",
1165 esp->host->unique_id, target, lun);
1166 goto do_reset;
1167 }
1168 lp = dev->hostdata;
1169
1170 ent = lp->non_tagged_cmd;
1171 if (!ent) {
1172 ent = esp_reconnect_with_tag(esp, lp);
1173 if (!ent)
1174 goto do_reset;
1175 }
1176
1177 esp->active_cmd = ent;
1178
1179 if (ent->flags & ESP_CMD_FLAG_ABORT) {
1180 esp->msg_out[0] = ABORT_TASK_SET;
1181 esp->msg_out_len = 1;
1182 scsi_esp_cmd(esp, ESP_CMD_SATN);
1183 }
1184
1185 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1186 esp_restore_pointers(esp, ent);
1187 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1188 return 1;
1189
1190 do_reset:
1191 esp_schedule_reset(esp);
1192 return 0;
1193 }
1194
1195 static int esp_finish_select(struct esp *esp)
1196 {
1197 struct esp_cmd_entry *ent;
1198 struct scsi_cmnd *cmd;
1199 u8 orig_select_state;
1200
1201 orig_select_state = esp->select_state;
1202
1203 /* No longer selecting. */
1204 esp->select_state = ESP_SELECT_NONE;
1205
1206 esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS;
1207 ent = esp->active_cmd;
1208 cmd = ent->cmd;
1209
1210 if (esp->ops->dma_error(esp)) {
1211 /* If we see a DMA error during or as a result of selection,
1212 * all bets are off.
1213 */
1214 esp_schedule_reset(esp);
1215 esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16));
1216 return 0;
1217 }
1218
1219 esp->ops->dma_invalidate(esp);
1220
1221 if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
1222 struct esp_target_data *tp = &esp->target[cmd->device->id];
1223
1224 /* Carefully back out of the selection attempt. Release
1225 * resources (such as DMA mapping & TAG) and reset state (such
1226 * as message out and command delivery variables).
1227 */
1228 if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1229 esp_unmap_dma(esp, cmd);
1230 esp_free_lun_tag(ent, cmd->device->hostdata);
1231 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE);
1232 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
1233 esp->cmd_bytes_ptr = NULL;
1234 esp->cmd_bytes_left = 0;
1235 } else {
1236 esp->ops->unmap_single(esp, ent->sense_dma,
1237 SCSI_SENSE_BUFFERSIZE,
1238 DMA_FROM_DEVICE);
1239 ent->sense_ptr = NULL;
1240 }
1241
1242 /* Now that the state is unwound properly, put back onto
1243 * the issue queue. This command is no longer active.
1244 */
1245 list_del(&ent->list);
1246 list_add(&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 (esp->flags & ESP_FLAG_DISABLE_SYNC)
1453 offset = 0;
1454
1455 if (offset) {
1456 int one_clock;
1457
1458 if (period > esp->max_period) {
1459 period = offset = 0;
1460 goto do_sdtr;
1461 }
1462 if (period < esp->min_period)
1463 goto do_reject;
1464
1465 one_clock = esp->ccycle / 1000;
1466 stp = DIV_ROUND_UP(period << 2, one_clock);
1467 if (stp && esp->rev >= FAS236) {
1468 if (stp >= 50)
1469 stp--;
1470 }
1471 } else {
1472 stp = 0;
1473 }
1474
1475 esp_setsync(esp, tp, period, offset, stp, offset);
1476 return;
1477
1478 do_reject:
1479 esp->msg_out[0] = MESSAGE_REJECT;
1480 esp->msg_out_len = 1;
1481 scsi_esp_cmd(esp, ESP_CMD_SATN);
1482 return;
1483
1484 do_sdtr:
1485 tp->nego_goal_period = period;
1486 tp->nego_goal_offset = offset;
1487 esp->msg_out_len =
1488 spi_populate_sync_msg(&esp->msg_out[0],
1489 tp->nego_goal_period,
1490 tp->nego_goal_offset);
1491 scsi_esp_cmd(esp, ESP_CMD_SATN);
1492 }
1493
1494 static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp)
1495 {
1496 int size = 8 << esp->msg_in[3];
1497 u8 cfg3;
1498
1499 if (esp->rev != FASHME)
1500 goto do_reject;
1501
1502 if (size != 8 && size != 16)
1503 goto do_reject;
1504
1505 if (!(tp->flags & ESP_TGT_NEGO_WIDE))
1506 goto do_reject;
1507
1508 cfg3 = tp->esp_config3;
1509 if (size == 16) {
1510 tp->flags |= ESP_TGT_WIDE;
1511 cfg3 |= ESP_CONFIG3_EWIDE;
1512 } else {
1513 tp->flags &= ~ESP_TGT_WIDE;
1514 cfg3 &= ~ESP_CONFIG3_EWIDE;
1515 }
1516 tp->esp_config3 = cfg3;
1517 esp->prev_cfg3 = cfg3;
1518 esp_write8(cfg3, ESP_CFG3);
1519
1520 tp->flags &= ~ESP_TGT_NEGO_WIDE;
1521
1522 spi_period(tp->starget) = 0;
1523 spi_offset(tp->starget) = 0;
1524 if (!esp_need_to_nego_sync(tp)) {
1525 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1526 scsi_esp_cmd(esp, ESP_CMD_RATN);
1527 } else {
1528 esp->msg_out_len =
1529 spi_populate_sync_msg(&esp->msg_out[0],
1530 tp->nego_goal_period,
1531 tp->nego_goal_offset);
1532 tp->flags |= ESP_TGT_NEGO_SYNC;
1533 scsi_esp_cmd(esp, ESP_CMD_SATN);
1534 }
1535 return;
1536
1537 do_reject:
1538 esp->msg_out[0] = MESSAGE_REJECT;
1539 esp->msg_out_len = 1;
1540 scsi_esp_cmd(esp, ESP_CMD_SATN);
1541 }
1542
1543 static void esp_msgin_extended(struct esp *esp)
1544 {
1545 struct esp_cmd_entry *ent = esp->active_cmd;
1546 struct scsi_cmnd *cmd = ent->cmd;
1547 struct esp_target_data *tp;
1548 int tgt = cmd->device->id;
1549
1550 tp = &esp->target[tgt];
1551 if (esp->msg_in[2] == EXTENDED_SDTR) {
1552 esp_msgin_sdtr(esp, tp);
1553 return;
1554 }
1555 if (esp->msg_in[2] == EXTENDED_WDTR) {
1556 esp_msgin_wdtr(esp, tp);
1557 return;
1558 }
1559
1560 printk("ESP: Unexpected extended msg type %x\n",
1561 esp->msg_in[2]);
1562
1563 esp->msg_out[0] = ABORT_TASK_SET;
1564 esp->msg_out_len = 1;
1565 scsi_esp_cmd(esp, ESP_CMD_SATN);
1566 }
1567
1568 /* Analyze msgin bytes received from target so far. Return non-zero
1569 * if there are more bytes needed to complete the message.
1570 */
1571 static int esp_msgin_process(struct esp *esp)
1572 {
1573 u8 msg0 = esp->msg_in[0];
1574 int len = esp->msg_in_len;
1575
1576 if (msg0 & 0x80) {
1577 /* Identify */
1578 printk("ESP: Unexpected msgin identify\n");
1579 return 0;
1580 }
1581
1582 switch (msg0) {
1583 case EXTENDED_MESSAGE:
1584 if (len == 1)
1585 return 1;
1586 if (len < esp->msg_in[1] + 2)
1587 return 1;
1588 esp_msgin_extended(esp);
1589 return 0;
1590
1591 case IGNORE_WIDE_RESIDUE: {
1592 struct esp_cmd_entry *ent;
1593 struct esp_cmd_priv *spriv;
1594 if (len == 1)
1595 return 1;
1596
1597 if (esp->msg_in[1] != 1)
1598 goto do_reject;
1599
1600 ent = esp->active_cmd;
1601 spriv = ESP_CMD_PRIV(ent->cmd);
1602
1603 if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) {
1604 spriv->cur_sg--;
1605 spriv->cur_residue = 1;
1606 } else
1607 spriv->cur_residue++;
1608 spriv->tot_residue++;
1609 return 0;
1610 }
1611 case NOP:
1612 return 0;
1613 case RESTORE_POINTERS:
1614 esp_restore_pointers(esp, esp->active_cmd);
1615 return 0;
1616 case SAVE_POINTERS:
1617 esp_save_pointers(esp, esp->active_cmd);
1618 return 0;
1619
1620 case COMMAND_COMPLETE:
1621 case DISCONNECT: {
1622 struct esp_cmd_entry *ent = esp->active_cmd;
1623
1624 ent->message = msg0;
1625 esp_event(esp, ESP_EVENT_FREE_BUS);
1626 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1627 return 0;
1628 }
1629 case MESSAGE_REJECT:
1630 esp_msgin_reject(esp);
1631 return 0;
1632
1633 default:
1634 do_reject:
1635 esp->msg_out[0] = MESSAGE_REJECT;
1636 esp->msg_out_len = 1;
1637 scsi_esp_cmd(esp, ESP_CMD_SATN);
1638 return 0;
1639 }
1640 }
1641
1642 static int esp_process_event(struct esp *esp)
1643 {
1644 int write;
1645
1646 again:
1647 write = 0;
1648 switch (esp->event) {
1649 case ESP_EVENT_CHECK_PHASE:
1650 switch (esp->sreg & ESP_STAT_PMASK) {
1651 case ESP_DOP:
1652 esp_event(esp, ESP_EVENT_DATA_OUT);
1653 break;
1654 case ESP_DIP:
1655 esp_event(esp, ESP_EVENT_DATA_IN);
1656 break;
1657 case ESP_STATP:
1658 esp_flush_fifo(esp);
1659 scsi_esp_cmd(esp, ESP_CMD_ICCSEQ);
1660 esp_event(esp, ESP_EVENT_STATUS);
1661 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1662 return 1;
1663
1664 case ESP_MOP:
1665 esp_event(esp, ESP_EVENT_MSGOUT);
1666 break;
1667
1668 case ESP_MIP:
1669 esp_event(esp, ESP_EVENT_MSGIN);
1670 break;
1671
1672 case ESP_CMDP:
1673 esp_event(esp, ESP_EVENT_CMD_START);
1674 break;
1675
1676 default:
1677 printk("ESP: Unexpected phase, sreg=%02x\n",
1678 esp->sreg);
1679 esp_schedule_reset(esp);
1680 return 0;
1681 }
1682 goto again;
1683 break;
1684
1685 case ESP_EVENT_DATA_IN:
1686 write = 1;
1687 /* fallthru */
1688
1689 case ESP_EVENT_DATA_OUT: {
1690 struct esp_cmd_entry *ent = esp->active_cmd;
1691 struct scsi_cmnd *cmd = ent->cmd;
1692 dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd);
1693 unsigned int dma_len = esp_cur_dma_len(ent, cmd);
1694
1695 if (esp->rev == ESP100)
1696 scsi_esp_cmd(esp, ESP_CMD_NULL);
1697
1698 if (write)
1699 ent->flags |= ESP_CMD_FLAG_WRITE;
1700 else
1701 ent->flags &= ~ESP_CMD_FLAG_WRITE;
1702
1703 if (esp->ops->dma_length_limit)
1704 dma_len = esp->ops->dma_length_limit(esp, dma_addr,
1705 dma_len);
1706 else
1707 dma_len = esp_dma_length_limit(esp, dma_addr, dma_len);
1708
1709 esp->data_dma_len = dma_len;
1710
1711 if (!dma_len) {
1712 printk(KERN_ERR PFX "esp%d: DMA length is zero!\n",
1713 esp->host->unique_id);
1714 printk(KERN_ERR PFX "esp%d: cur adr[%08llx] len[%08x]\n",
1715 esp->host->unique_id,
1716 (unsigned long long)esp_cur_dma_addr(ent, cmd),
1717 esp_cur_dma_len(ent, cmd));
1718 esp_schedule_reset(esp);
1719 return 0;
1720 }
1721
1722 esp_log_datastart("ESP: start data addr[%08llx] len[%u] "
1723 "write(%d)\n",
1724 (unsigned long long)dma_addr, dma_len, write);
1725
1726 esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len,
1727 write, ESP_CMD_DMA | ESP_CMD_TI);
1728 esp_event(esp, ESP_EVENT_DATA_DONE);
1729 break;
1730 }
1731 case ESP_EVENT_DATA_DONE: {
1732 struct esp_cmd_entry *ent = esp->active_cmd;
1733 struct scsi_cmnd *cmd = ent->cmd;
1734 int bytes_sent;
1735
1736 if (esp->ops->dma_error(esp)) {
1737 printk("ESP: data done, DMA error, resetting\n");
1738 esp_schedule_reset(esp);
1739 return 0;
1740 }
1741
1742 if (ent->flags & ESP_CMD_FLAG_WRITE) {
1743 /* XXX parity errors, etc. XXX */
1744
1745 esp->ops->dma_drain(esp);
1746 }
1747 esp->ops->dma_invalidate(esp);
1748
1749 if (esp->ireg != ESP_INTR_BSERV) {
1750 /* We should always see exactly a bus-service
1751 * interrupt at the end of a successful transfer.
1752 */
1753 printk("ESP: data done, not BSERV, resetting\n");
1754 esp_schedule_reset(esp);
1755 return 0;
1756 }
1757
1758 bytes_sent = esp_data_bytes_sent(esp, ent, cmd);
1759
1760 esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n",
1761 ent->flags, bytes_sent);
1762
1763 if (bytes_sent < 0) {
1764 /* XXX force sync mode for this target XXX */
1765 esp_schedule_reset(esp);
1766 return 0;
1767 }
1768
1769 esp_advance_dma(esp, ent, cmd, bytes_sent);
1770 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1771 goto again;
1772 }
1773
1774 case ESP_EVENT_STATUS: {
1775 struct esp_cmd_entry *ent = esp->active_cmd;
1776
1777 if (esp->ireg & ESP_INTR_FDONE) {
1778 ent->status = esp_read8(ESP_FDATA);
1779 ent->message = esp_read8(ESP_FDATA);
1780 scsi_esp_cmd(esp, ESP_CMD_MOK);
1781 } else if (esp->ireg == ESP_INTR_BSERV) {
1782 ent->status = esp_read8(ESP_FDATA);
1783 ent->message = 0xff;
1784 esp_event(esp, ESP_EVENT_MSGIN);
1785 return 0;
1786 }
1787
1788 if (ent->message != COMMAND_COMPLETE) {
1789 printk("ESP: Unexpected message %x in status\n",
1790 ent->message);
1791 esp_schedule_reset(esp);
1792 return 0;
1793 }
1794
1795 esp_event(esp, ESP_EVENT_FREE_BUS);
1796 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1797 break;
1798 }
1799 case ESP_EVENT_FREE_BUS: {
1800 struct esp_cmd_entry *ent = esp->active_cmd;
1801 struct scsi_cmnd *cmd = ent->cmd;
1802
1803 if (ent->message == COMMAND_COMPLETE ||
1804 ent->message == DISCONNECT)
1805 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1806
1807 if (ent->message == COMMAND_COMPLETE) {
1808 esp_log_cmddone("ESP: Command done status[%x] "
1809 "message[%x]\n",
1810 ent->status, ent->message);
1811 if (ent->status == SAM_STAT_TASK_SET_FULL)
1812 esp_event_queue_full(esp, ent);
1813
1814 if (ent->status == SAM_STAT_CHECK_CONDITION &&
1815 !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1816 ent->flags |= ESP_CMD_FLAG_AUTOSENSE;
1817 esp_autosense(esp, ent);
1818 } else {
1819 esp_cmd_is_done(esp, ent, cmd,
1820 compose_result(ent->status,
1821 ent->message,
1822 DID_OK));
1823 }
1824 } else if (ent->message == DISCONNECT) {
1825 esp_log_disconnect("ESP: Disconnecting tgt[%d] "
1826 "tag[%x:%x]\n",
1827 cmd->device->id,
1828 ent->tag[0], ent->tag[1]);
1829
1830 esp->active_cmd = NULL;
1831 esp_maybe_execute_command(esp);
1832 } else {
1833 printk("ESP: Unexpected message %x in freebus\n",
1834 ent->message);
1835 esp_schedule_reset(esp);
1836 return 0;
1837 }
1838 if (esp->active_cmd)
1839 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1840 break;
1841 }
1842 case ESP_EVENT_MSGOUT: {
1843 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1844
1845 if (esp_debug & ESP_DEBUG_MSGOUT) {
1846 int i;
1847 printk("ESP: Sending message [ ");
1848 for (i = 0; i < esp->msg_out_len; i++)
1849 printk("%02x ", esp->msg_out[i]);
1850 printk("]\n");
1851 }
1852
1853 if (esp->rev == FASHME) {
1854 int i;
1855
1856 /* Always use the fifo. */
1857 for (i = 0; i < esp->msg_out_len; i++) {
1858 esp_write8(esp->msg_out[i], ESP_FDATA);
1859 esp_write8(0, ESP_FDATA);
1860 }
1861 scsi_esp_cmd(esp, ESP_CMD_TI);
1862 } else {
1863 if (esp->msg_out_len == 1) {
1864 esp_write8(esp->msg_out[0], ESP_FDATA);
1865 scsi_esp_cmd(esp, ESP_CMD_TI);
1866 } else {
1867 /* Use DMA. */
1868 memcpy(esp->command_block,
1869 esp->msg_out,
1870 esp->msg_out_len);
1871
1872 esp->ops->send_dma_cmd(esp,
1873 esp->command_block_dma,
1874 esp->msg_out_len,
1875 esp->msg_out_len,
1876 0,
1877 ESP_CMD_DMA|ESP_CMD_TI);
1878 }
1879 }
1880 esp_event(esp, ESP_EVENT_MSGOUT_DONE);
1881 break;
1882 }
1883 case ESP_EVENT_MSGOUT_DONE:
1884 if (esp->rev == FASHME) {
1885 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1886 } else {
1887 if (esp->msg_out_len > 1)
1888 esp->ops->dma_invalidate(esp);
1889 }
1890
1891 if (!(esp->ireg & ESP_INTR_DC)) {
1892 if (esp->rev != FASHME)
1893 scsi_esp_cmd(esp, ESP_CMD_NULL);
1894 }
1895 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1896 goto again;
1897 case ESP_EVENT_MSGIN:
1898 if (esp->ireg & ESP_INTR_BSERV) {
1899 if (esp->rev == FASHME) {
1900 if (!(esp_read8(ESP_STATUS2) &
1901 ESP_STAT2_FEMPTY))
1902 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1903 } else {
1904 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1905 if (esp->rev == ESP100)
1906 scsi_esp_cmd(esp, ESP_CMD_NULL);
1907 }
1908 scsi_esp_cmd(esp, ESP_CMD_TI);
1909 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1910 return 1;
1911 }
1912 if (esp->ireg & ESP_INTR_FDONE) {
1913 u8 val;
1914
1915 if (esp->rev == FASHME)
1916 val = esp->fifo[0];
1917 else
1918 val = esp_read8(ESP_FDATA);
1919 esp->msg_in[esp->msg_in_len++] = val;
1920
1921 esp_log_msgin("ESP: Got msgin byte %x\n", val);
1922
1923 if (!esp_msgin_process(esp))
1924 esp->msg_in_len = 0;
1925
1926 if (esp->rev == FASHME)
1927 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1928
1929 scsi_esp_cmd(esp, ESP_CMD_MOK);
1930
1931 if (esp->event != ESP_EVENT_FREE_BUS)
1932 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1933 } else {
1934 printk("ESP: MSGIN neither BSERV not FDON, resetting");
1935 esp_schedule_reset(esp);
1936 return 0;
1937 }
1938 break;
1939 case ESP_EVENT_CMD_START:
1940 memcpy(esp->command_block, esp->cmd_bytes_ptr,
1941 esp->cmd_bytes_left);
1942 if (esp->rev == FASHME)
1943 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1944 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1945 esp->cmd_bytes_left, 16, 0,
1946 ESP_CMD_DMA | ESP_CMD_TI);
1947 esp_event(esp, ESP_EVENT_CMD_DONE);
1948 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1949 break;
1950 case ESP_EVENT_CMD_DONE:
1951 esp->ops->dma_invalidate(esp);
1952 if (esp->ireg & ESP_INTR_BSERV) {
1953 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1954 goto again;
1955 }
1956 esp_schedule_reset(esp);
1957 return 0;
1958 break;
1959
1960 case ESP_EVENT_RESET:
1961 scsi_esp_cmd(esp, ESP_CMD_RS);
1962 break;
1963
1964 default:
1965 printk("ESP: Unexpected event %x, resetting\n",
1966 esp->event);
1967 esp_schedule_reset(esp);
1968 return 0;
1969 break;
1970 }
1971 return 1;
1972 }
1973
1974 static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent)
1975 {
1976 struct scsi_cmnd *cmd = ent->cmd;
1977
1978 esp_unmap_dma(esp, cmd);
1979 esp_free_lun_tag(ent, cmd->device->hostdata);
1980 cmd->result = DID_RESET << 16;
1981
1982 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
1983 esp->ops->unmap_single(esp, ent->sense_dma,
1984 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1985 ent->sense_ptr = NULL;
1986 }
1987
1988 cmd->scsi_done(cmd);
1989 list_del(&ent->list);
1990 esp_put_ent(esp, ent);
1991 }
1992
1993 static void esp_clear_hold(struct scsi_device *dev, void *data)
1994 {
1995 struct esp_lun_data *lp = dev->hostdata;
1996
1997 BUG_ON(lp->num_tagged);
1998 lp->hold = 0;
1999 }
2000
2001 static void esp_reset_cleanup(struct esp *esp)
2002 {
2003 struct esp_cmd_entry *ent, *tmp;
2004 int i;
2005
2006 list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) {
2007 struct scsi_cmnd *cmd = ent->cmd;
2008
2009 list_del(&ent->list);
2010 cmd->result = DID_RESET << 16;
2011 cmd->scsi_done(cmd);
2012 esp_put_ent(esp, ent);
2013 }
2014
2015 list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) {
2016 if (ent == esp->active_cmd)
2017 esp->active_cmd = NULL;
2018 esp_reset_cleanup_one(esp, ent);
2019 }
2020
2021 BUG_ON(esp->active_cmd != NULL);
2022
2023 /* Force renegotiation of sync/wide transfers. */
2024 for (i = 0; i < ESP_MAX_TARGET; i++) {
2025 struct esp_target_data *tp = &esp->target[i];
2026
2027 tp->esp_period = 0;
2028 tp->esp_offset = 0;
2029 tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE |
2030 ESP_CONFIG3_FSCSI |
2031 ESP_CONFIG3_FAST);
2032 tp->flags &= ~ESP_TGT_WIDE;
2033 tp->flags |= ESP_TGT_CHECK_NEGO;
2034
2035 if (tp->starget)
2036 __starget_for_each_device(tp->starget, NULL,
2037 esp_clear_hold);
2038 }
2039 esp->flags &= ~ESP_FLAG_RESETTING;
2040 }
2041
2042 /* Runs under host->lock */
2043 static void __esp_interrupt(struct esp *esp)
2044 {
2045 int finish_reset, intr_done;
2046 u8 phase;
2047
2048 esp->sreg = esp_read8(ESP_STATUS);
2049
2050 if (esp->flags & ESP_FLAG_RESETTING) {
2051 finish_reset = 1;
2052 } else {
2053 if (esp_check_gross_error(esp))
2054 return;
2055
2056 finish_reset = esp_check_spur_intr(esp);
2057 if (finish_reset < 0)
2058 return;
2059 }
2060
2061 esp->ireg = esp_read8(ESP_INTRPT);
2062
2063 if (esp->ireg & ESP_INTR_SR)
2064 finish_reset = 1;
2065
2066 if (finish_reset) {
2067 esp_reset_cleanup(esp);
2068 if (esp->eh_reset) {
2069 complete(esp->eh_reset);
2070 esp->eh_reset = NULL;
2071 }
2072 return;
2073 }
2074
2075 phase = (esp->sreg & ESP_STAT_PMASK);
2076 if (esp->rev == FASHME) {
2077 if (((phase != ESP_DIP && phase != ESP_DOP) &&
2078 esp->select_state == ESP_SELECT_NONE &&
2079 esp->event != ESP_EVENT_STATUS &&
2080 esp->event != ESP_EVENT_DATA_DONE) ||
2081 (esp->ireg & ESP_INTR_RSEL)) {
2082 esp->sreg2 = esp_read8(ESP_STATUS2);
2083 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2084 (esp->sreg2 & ESP_STAT2_F1BYTE))
2085 hme_read_fifo(esp);
2086 }
2087 }
2088
2089 esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] "
2090 "sreg2[%02x] ireg[%02x]\n",
2091 esp->sreg, esp->seqreg, esp->sreg2, esp->ireg);
2092
2093 intr_done = 0;
2094
2095 if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) {
2096 printk("ESP: unexpected IREG %02x\n", esp->ireg);
2097 if (esp->ireg & ESP_INTR_IC)
2098 esp_dump_cmd_log(esp);
2099
2100 esp_schedule_reset(esp);
2101 } else {
2102 if (!(esp->ireg & ESP_INTR_RSEL)) {
2103 /* Some combination of FDONE, BSERV, DC. */
2104 if (esp->select_state != ESP_SELECT_NONE)
2105 intr_done = esp_finish_select(esp);
2106 } else if (esp->ireg & ESP_INTR_RSEL) {
2107 if (esp->active_cmd)
2108 (void) esp_finish_select(esp);
2109 intr_done = esp_reconnect(esp);
2110 }
2111 }
2112 while (!intr_done)
2113 intr_done = esp_process_event(esp);
2114 }
2115
2116 irqreturn_t scsi_esp_intr(int irq, void *dev_id)
2117 {
2118 struct esp *esp = dev_id;
2119 unsigned long flags;
2120 irqreturn_t ret;
2121
2122 spin_lock_irqsave(esp->host->host_lock, flags);
2123 ret = IRQ_NONE;
2124 if (esp->ops->irq_pending(esp)) {
2125 ret = IRQ_HANDLED;
2126 for (;;) {
2127 int i;
2128
2129 __esp_interrupt(esp);
2130 if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK))
2131 break;
2132 esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK;
2133
2134 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
2135 if (esp->ops->irq_pending(esp))
2136 break;
2137 }
2138 if (i == ESP_QUICKIRQ_LIMIT)
2139 break;
2140 }
2141 }
2142 spin_unlock_irqrestore(esp->host->host_lock, flags);
2143
2144 return ret;
2145 }
2146 EXPORT_SYMBOL(scsi_esp_intr);
2147
2148 static void esp_get_revision(struct esp *esp)
2149 {
2150 u8 val;
2151
2152 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
2153 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
2154 esp_write8(esp->config2, ESP_CFG2);
2155
2156 val = esp_read8(ESP_CFG2);
2157 val &= ~ESP_CONFIG2_MAGIC;
2158 if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
2159 /* If what we write to cfg2 does not come back, cfg2 is not
2160 * implemented, therefore this must be a plain esp100.
2161 */
2162 esp->rev = ESP100;
2163 } else {
2164 esp->config2 = 0;
2165 esp_set_all_config3(esp, 5);
2166 esp->prev_cfg3 = 5;
2167 esp_write8(esp->config2, ESP_CFG2);
2168 esp_write8(0, ESP_CFG3);
2169 esp_write8(esp->prev_cfg3, ESP_CFG3);
2170
2171 val = esp_read8(ESP_CFG3);
2172 if (val != 5) {
2173 /* The cfg2 register is implemented, however
2174 * cfg3 is not, must be esp100a.
2175 */
2176 esp->rev = ESP100A;
2177 } else {
2178 esp_set_all_config3(esp, 0);
2179 esp->prev_cfg3 = 0;
2180 esp_write8(esp->prev_cfg3, ESP_CFG3);
2181
2182 /* All of cfg{1,2,3} implemented, must be one of
2183 * the fas variants, figure out which one.
2184 */
2185 if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) {
2186 esp->rev = FAST;
2187 esp->sync_defp = SYNC_DEFP_FAST;
2188 } else {
2189 esp->rev = ESP236;
2190 }
2191 esp->config2 = 0;
2192 esp_write8(esp->config2, ESP_CFG2);
2193 }
2194 }
2195 }
2196
2197 static void esp_init_swstate(struct esp *esp)
2198 {
2199 int i;
2200
2201 INIT_LIST_HEAD(&esp->queued_cmds);
2202 INIT_LIST_HEAD(&esp->active_cmds);
2203 INIT_LIST_HEAD(&esp->esp_cmd_pool);
2204
2205 /* Start with a clear state, domain validation (via ->slave_configure,
2206 * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged
2207 * commands.
2208 */
2209 for (i = 0 ; i < ESP_MAX_TARGET; i++) {
2210 esp->target[i].flags = 0;
2211 esp->target[i].nego_goal_period = 0;
2212 esp->target[i].nego_goal_offset = 0;
2213 esp->target[i].nego_goal_width = 0;
2214 esp->target[i].nego_goal_tags = 0;
2215 }
2216 }
2217
2218 /* This places the ESP into a known state at boot time. */
2219 static void esp_bootup_reset(struct esp *esp)
2220 {
2221 u8 val;
2222
2223 /* Reset the DMA */
2224 esp->ops->reset_dma(esp);
2225
2226 /* Reset the ESP */
2227 esp_reset_esp(esp);
2228
2229 /* Reset the SCSI bus, but tell ESP not to generate an irq */
2230 val = esp_read8(ESP_CFG1);
2231 val |= ESP_CONFIG1_SRRDISAB;
2232 esp_write8(val, ESP_CFG1);
2233
2234 scsi_esp_cmd(esp, ESP_CMD_RS);
2235 udelay(400);
2236
2237 esp_write8(esp->config1, ESP_CFG1);
2238
2239 /* Eat any bitrot in the chip and we are done... */
2240 esp_read8(ESP_INTRPT);
2241 }
2242
2243 static void esp_set_clock_params(struct esp *esp)
2244 {
2245 int fhz;
2246 u8 ccf;
2247
2248 /* This is getting messy but it has to be done correctly or else
2249 * you get weird behavior all over the place. We are trying to
2250 * basically figure out three pieces of information.
2251 *
2252 * a) Clock Conversion Factor
2253 *
2254 * This is a representation of the input crystal clock frequency
2255 * going into the ESP on this machine. Any operation whose timing
2256 * is longer than 400ns depends on this value being correct. For
2257 * example, you'll get blips for arbitration/selection during high
2258 * load or with multiple targets if this is not set correctly.
2259 *
2260 * b) Selection Time-Out
2261 *
2262 * The ESP isn't very bright and will arbitrate for the bus and try
2263 * to select a target forever if you let it. This value tells the
2264 * ESP when it has taken too long to negotiate and that it should
2265 * interrupt the CPU so we can see what happened. The value is
2266 * computed as follows (from NCR/Symbios chip docs).
2267 *
2268 * (Time Out Period) * (Input Clock)
2269 * STO = ----------------------------------
2270 * (8192) * (Clock Conversion Factor)
2271 *
2272 * We use a time out period of 250ms (ESP_BUS_TIMEOUT).
2273 *
2274 * c) Imperical constants for synchronous offset and transfer period
2275 * register values
2276 *
2277 * This entails the smallest and largest sync period we could ever
2278 * handle on this ESP.
2279 */
2280 fhz = esp->cfreq;
2281
2282 ccf = ((fhz / 1000000) + 4) / 5;
2283 if (ccf == 1)
2284 ccf = 2;
2285
2286 /* If we can't find anything reasonable, just assume 20MHZ.
2287 * This is the clock frequency of the older sun4c's where I've
2288 * been unable to find the clock-frequency PROM property. All
2289 * other machines provide useful values it seems.
2290 */
2291 if (fhz <= 5000000 || ccf < 1 || ccf > 8) {
2292 fhz = 20000000;
2293 ccf = 4;
2294 }
2295
2296 esp->cfact = (ccf == 8 ? 0 : ccf);
2297 esp->cfreq = fhz;
2298 esp->ccycle = ESP_HZ_TO_CYCLE(fhz);
2299 esp->ctick = ESP_TICK(ccf, esp->ccycle);
2300 esp->neg_defp = ESP_NEG_DEFP(fhz, ccf);
2301 esp->sync_defp = SYNC_DEFP_SLOW;
2302 }
2303
2304 static const char *esp_chip_names[] = {
2305 "ESP100",
2306 "ESP100A",
2307 "ESP236",
2308 "FAS236",
2309 "FAS100A",
2310 "FAST",
2311 "FASHME",
2312 };
2313
2314 static struct scsi_transport_template *esp_transport_template;
2315
2316 int scsi_esp_register(struct esp *esp, struct device *dev)
2317 {
2318 static int instance;
2319 int err;
2320
2321 esp->host->transportt = esp_transport_template;
2322 esp->host->max_lun = ESP_MAX_LUN;
2323 esp->host->cmd_per_lun = 2;
2324 esp->host->unique_id = instance;
2325
2326 esp_set_clock_params(esp);
2327
2328 esp_get_revision(esp);
2329
2330 esp_init_swstate(esp);
2331
2332 esp_bootup_reset(esp);
2333
2334 printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n",
2335 esp->host->unique_id, esp->regs, esp->dma_regs,
2336 esp->host->irq);
2337 printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n",
2338 esp->host->unique_id, esp_chip_names[esp->rev],
2339 esp->cfreq / 1000000, esp->cfact, esp->scsi_id);
2340
2341 /* Let the SCSI bus reset settle. */
2342 ssleep(esp_bus_reset_settle);
2343
2344 err = scsi_add_host(esp->host, dev);
2345 if (err)
2346 return err;
2347
2348 instance++;
2349
2350 scsi_scan_host(esp->host);
2351
2352 return 0;
2353 }
2354 EXPORT_SYMBOL(scsi_esp_register);
2355
2356 void scsi_esp_unregister(struct esp *esp)
2357 {
2358 scsi_remove_host(esp->host);
2359 }
2360 EXPORT_SYMBOL(scsi_esp_unregister);
2361
2362 static int esp_target_alloc(struct scsi_target *starget)
2363 {
2364 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2365 struct esp_target_data *tp = &esp->target[starget->id];
2366
2367 tp->starget = starget;
2368
2369 return 0;
2370 }
2371
2372 static void esp_target_destroy(struct scsi_target *starget)
2373 {
2374 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2375 struct esp_target_data *tp = &esp->target[starget->id];
2376
2377 tp->starget = NULL;
2378 }
2379
2380 static int esp_slave_alloc(struct scsi_device *dev)
2381 {
2382 struct esp *esp = shost_priv(dev->host);
2383 struct esp_target_data *tp = &esp->target[dev->id];
2384 struct esp_lun_data *lp;
2385
2386 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
2387 if (!lp)
2388 return -ENOMEM;
2389 dev->hostdata = lp;
2390
2391 spi_min_period(tp->starget) = esp->min_period;
2392 spi_max_offset(tp->starget) = 15;
2393
2394 if (esp->flags & ESP_FLAG_WIDE_CAPABLE)
2395 spi_max_width(tp->starget) = 1;
2396 else
2397 spi_max_width(tp->starget) = 0;
2398
2399 return 0;
2400 }
2401
2402 static int esp_slave_configure(struct scsi_device *dev)
2403 {
2404 struct esp *esp = shost_priv(dev->host);
2405 struct esp_target_data *tp = &esp->target[dev->id];
2406 int goal_tags, queue_depth;
2407
2408 if (esp->flags & ESP_FLAG_DISABLE_SYNC) {
2409 /* Bypass async domain validation */
2410 dev->ppr = 0;
2411 dev->sdtr = 0;
2412 }
2413
2414 goal_tags = 0;
2415
2416 if (dev->tagged_supported) {
2417 /* XXX make this configurable somehow XXX */
2418 goal_tags = ESP_DEFAULT_TAGS;
2419
2420 if (goal_tags > ESP_MAX_TAG)
2421 goal_tags = ESP_MAX_TAG;
2422 }
2423
2424 queue_depth = goal_tags;
2425 if (queue_depth < dev->host->cmd_per_lun)
2426 queue_depth = dev->host->cmd_per_lun;
2427
2428 if (goal_tags) {
2429 scsi_set_tag_type(dev, MSG_ORDERED_TAG);
2430 scsi_activate_tcq(dev, queue_depth);
2431 } else {
2432 scsi_deactivate_tcq(dev, queue_depth);
2433 }
2434 tp->flags |= ESP_TGT_DISCONNECT;
2435
2436 if (!spi_initial_dv(dev->sdev_target))
2437 spi_dv_device(dev);
2438
2439 return 0;
2440 }
2441
2442 static void esp_slave_destroy(struct scsi_device *dev)
2443 {
2444 struct esp_lun_data *lp = dev->hostdata;
2445
2446 kfree(lp);
2447 dev->hostdata = NULL;
2448 }
2449
2450 static int esp_eh_abort_handler(struct scsi_cmnd *cmd)
2451 {
2452 struct esp *esp = shost_priv(cmd->device->host);
2453 struct esp_cmd_entry *ent, *tmp;
2454 struct completion eh_done;
2455 unsigned long flags;
2456
2457 /* XXX This helps a lot with debugging but might be a bit
2458 * XXX much for the final driver.
2459 */
2460 spin_lock_irqsave(esp->host->host_lock, flags);
2461 printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n",
2462 esp->host->unique_id, cmd, cmd->cmnd[0]);
2463 ent = esp->active_cmd;
2464 if (ent)
2465 printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n",
2466 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2467 list_for_each_entry(ent, &esp->queued_cmds, list) {
2468 printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n",
2469 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2470 }
2471 list_for_each_entry(ent, &esp->active_cmds, list) {
2472 printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n",
2473 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2474 }
2475 esp_dump_cmd_log(esp);
2476 spin_unlock_irqrestore(esp->host->host_lock, flags);
2477
2478 spin_lock_irqsave(esp->host->host_lock, flags);
2479
2480 ent = NULL;
2481 list_for_each_entry(tmp, &esp->queued_cmds, list) {
2482 if (tmp->cmd == cmd) {
2483 ent = tmp;
2484 break;
2485 }
2486 }
2487
2488 if (ent) {
2489 /* Easiest case, we didn't even issue the command
2490 * yet so it is trivial to abort.
2491 */
2492 list_del(&ent->list);
2493
2494 cmd->result = DID_ABORT << 16;
2495 cmd->scsi_done(cmd);
2496
2497 esp_put_ent(esp, ent);
2498
2499 goto out_success;
2500 }
2501
2502 init_completion(&eh_done);
2503
2504 ent = esp->active_cmd;
2505 if (ent && ent->cmd == cmd) {
2506 /* Command is the currently active command on
2507 * the bus. If we already have an output message
2508 * pending, no dice.
2509 */
2510 if (esp->msg_out_len)
2511 goto out_failure;
2512
2513 /* Send out an abort, encouraging the target to
2514 * go to MSGOUT phase by asserting ATN.
2515 */
2516 esp->msg_out[0] = ABORT_TASK_SET;
2517 esp->msg_out_len = 1;
2518 ent->eh_done = &eh_done;
2519
2520 scsi_esp_cmd(esp, ESP_CMD_SATN);
2521 } else {
2522 /* The command is disconnected. This is not easy to
2523 * abort. For now we fail and let the scsi error
2524 * handling layer go try a scsi bus reset or host
2525 * reset.
2526 *
2527 * What we could do is put together a scsi command
2528 * solely for the purpose of sending an abort message
2529 * to the target. Coming up with all the code to
2530 * cook up scsi commands, special case them everywhere,
2531 * etc. is for questionable gain and it would be better
2532 * if the generic scsi error handling layer could do at
2533 * least some of that for us.
2534 *
2535 * Anyways this is an area for potential future improvement
2536 * in this driver.
2537 */
2538 goto out_failure;
2539 }
2540
2541 spin_unlock_irqrestore(esp->host->host_lock, flags);
2542
2543 if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) {
2544 spin_lock_irqsave(esp->host->host_lock, flags);
2545 ent->eh_done = NULL;
2546 spin_unlock_irqrestore(esp->host->host_lock, flags);
2547
2548 return FAILED;
2549 }
2550
2551 return SUCCESS;
2552
2553 out_success:
2554 spin_unlock_irqrestore(esp->host->host_lock, flags);
2555 return SUCCESS;
2556
2557 out_failure:
2558 /* XXX This might be a good location to set ESP_TGT_BROKEN
2559 * XXX since we know which target/lun in particular is
2560 * XXX causing trouble.
2561 */
2562 spin_unlock_irqrestore(esp->host->host_lock, flags);
2563 return FAILED;
2564 }
2565
2566 static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd)
2567 {
2568 struct esp *esp = shost_priv(cmd->device->host);
2569 struct completion eh_reset;
2570 unsigned long flags;
2571
2572 init_completion(&eh_reset);
2573
2574 spin_lock_irqsave(esp->host->host_lock, flags);
2575
2576 esp->eh_reset = &eh_reset;
2577
2578 /* XXX This is too simple... We should add lots of
2579 * XXX checks here so that if we find that the chip is
2580 * XXX very wedged we return failure immediately so
2581 * XXX that we can perform a full chip reset.
2582 */
2583 esp->flags |= ESP_FLAG_RESETTING;
2584 scsi_esp_cmd(esp, ESP_CMD_RS);
2585
2586 spin_unlock_irqrestore(esp->host->host_lock, flags);
2587
2588 ssleep(esp_bus_reset_settle);
2589
2590 if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) {
2591 spin_lock_irqsave(esp->host->host_lock, flags);
2592 esp->eh_reset = NULL;
2593 spin_unlock_irqrestore(esp->host->host_lock, flags);
2594
2595 return FAILED;
2596 }
2597
2598 return SUCCESS;
2599 }
2600
2601 /* All bets are off, reset the entire device. */
2602 static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd)
2603 {
2604 struct esp *esp = shost_priv(cmd->device->host);
2605 unsigned long flags;
2606
2607 spin_lock_irqsave(esp->host->host_lock, flags);
2608 esp_bootup_reset(esp);
2609 esp_reset_cleanup(esp);
2610 spin_unlock_irqrestore(esp->host->host_lock, flags);
2611
2612 ssleep(esp_bus_reset_settle);
2613
2614 return SUCCESS;
2615 }
2616
2617 static const char *esp_info(struct Scsi_Host *host)
2618 {
2619 return "esp";
2620 }
2621
2622 struct scsi_host_template scsi_esp_template = {
2623 .module = THIS_MODULE,
2624 .name = "esp",
2625 .info = esp_info,
2626 .queuecommand = esp_queuecommand,
2627 .target_alloc = esp_target_alloc,
2628 .target_destroy = esp_target_destroy,
2629 .slave_alloc = esp_slave_alloc,
2630 .slave_configure = esp_slave_configure,
2631 .slave_destroy = esp_slave_destroy,
2632 .eh_abort_handler = esp_eh_abort_handler,
2633 .eh_bus_reset_handler = esp_eh_bus_reset_handler,
2634 .eh_host_reset_handler = esp_eh_host_reset_handler,
2635 .can_queue = 7,
2636 .this_id = 7,
2637 .sg_tablesize = SG_ALL,
2638 .use_clustering = ENABLE_CLUSTERING,
2639 .max_sectors = 0xffff,
2640 .skip_settle_delay = 1,
2641 };
2642 EXPORT_SYMBOL(scsi_esp_template);
2643
2644 static void esp_get_signalling(struct Scsi_Host *host)
2645 {
2646 struct esp *esp = shost_priv(host);
2647 enum spi_signal_type type;
2648
2649 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
2650 type = SPI_SIGNAL_HVD;
2651 else
2652 type = SPI_SIGNAL_SE;
2653
2654 spi_signalling(host) = type;
2655 }
2656
2657 static void esp_set_offset(struct scsi_target *target, int offset)
2658 {
2659 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2660 struct esp *esp = shost_priv(host);
2661 struct esp_target_data *tp = &esp->target[target->id];
2662
2663 tp->nego_goal_offset = offset;
2664 tp->flags |= ESP_TGT_CHECK_NEGO;
2665 }
2666
2667 static void esp_set_period(struct scsi_target *target, int period)
2668 {
2669 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2670 struct esp *esp = shost_priv(host);
2671 struct esp_target_data *tp = &esp->target[target->id];
2672
2673 tp->nego_goal_period = period;
2674 tp->flags |= ESP_TGT_CHECK_NEGO;
2675 }
2676
2677 static void esp_set_width(struct scsi_target *target, int width)
2678 {
2679 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2680 struct esp *esp = shost_priv(host);
2681 struct esp_target_data *tp = &esp->target[target->id];
2682
2683 tp->nego_goal_width = (width ? 1 : 0);
2684 tp->flags |= ESP_TGT_CHECK_NEGO;
2685 }
2686
2687 static struct spi_function_template esp_transport_ops = {
2688 .set_offset = esp_set_offset,
2689 .show_offset = 1,
2690 .set_period = esp_set_period,
2691 .show_period = 1,
2692 .set_width = esp_set_width,
2693 .show_width = 1,
2694 .get_signalling = esp_get_signalling,
2695 };
2696
2697 static int __init esp_init(void)
2698 {
2699 BUILD_BUG_ON(sizeof(struct scsi_pointer) <
2700 sizeof(struct esp_cmd_priv));
2701
2702 esp_transport_template = spi_attach_transport(&esp_transport_ops);
2703 if (!esp_transport_template)
2704 return -ENODEV;
2705
2706 return 0;
2707 }
2708
2709 static void __exit esp_exit(void)
2710 {
2711 spi_release_transport(esp_transport_template);
2712 }
2713
2714 MODULE_DESCRIPTION("ESP SCSI driver core");
2715 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
2716 MODULE_LICENSE("GPL");
2717 MODULE_VERSION(DRV_VERSION);
2718
2719 module_param(esp_bus_reset_settle, int, 0);
2720 MODULE_PARM_DESC(esp_bus_reset_settle,
2721 "ESP scsi bus reset delay in seconds");
2722
2723 module_param(esp_debug, int, 0);
2724 MODULE_PARM_DESC(esp_debug,
2725 "ESP bitmapped debugging message enable value:\n"
2726 " 0x00000001 Log interrupt events\n"
2727 " 0x00000002 Log scsi commands\n"
2728 " 0x00000004 Log resets\n"
2729 " 0x00000008 Log message in events\n"
2730 " 0x00000010 Log message out events\n"
2731 " 0x00000020 Log command completion\n"
2732 " 0x00000040 Log disconnects\n"
2733 " 0x00000080 Log data start\n"
2734 " 0x00000100 Log data done\n"
2735 " 0x00000200 Log reconnects\n"
2736 " 0x00000400 Log auto-sense data\n"
2737 );
2738
2739 module_init(esp_init);
2740 module_exit(esp_exit);
Support for the Chinese Samsung S3C2440 based development boards