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cd9ad58d
DM		 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>
e1f2a094 16#include <linux/irqreturn.h>
cd9ad58d
DM		 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. */
38static int esp_bus_reset_settle = 3;
39
40static 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...) \
54do { if (esp_debug & ESP_DEBUG_INTR) \
55 printk(f, ## a); \
56} while (0)
57
58#define esp_log_reset(f, a...) \
59do { if (esp_debug & ESP_DEBUG_RESET) \
60 printk(f, ## a); \
61} while (0)
62
63#define esp_log_msgin(f, a...) \
64do { if (esp_debug & ESP_DEBUG_MSGIN) \
65 printk(f, ## a); \
66} while (0)
67
68#define esp_log_msgout(f, a...) \
69do { if (esp_debug & ESP_DEBUG_MSGOUT) \
70 printk(f, ## a); \
71} while (0)
72
73#define esp_log_cmddone(f, a...) \
74do { if (esp_debug & ESP_DEBUG_CMDDONE) \
75 printk(f, ## a); \
76} while (0)
77
78#define esp_log_disconnect(f, a...) \
79do { if (esp_debug & ESP_DEBUG_DISCONNECT) \
80 printk(f, ## a); \
81} while (0)
82
83#define esp_log_datastart(f, a...) \
84do { if (esp_debug & ESP_DEBUG_DATASTART) \
85 printk(f, ## a); \
86} while (0)
87
88#define esp_log_datadone(f, a...) \
89do { if (esp_debug & ESP_DEBUG_DATADONE) \
90 printk(f, ## a); \
91} while (0)
92
93#define esp_log_reconnect(f, a...) \
94do { if (esp_debug & ESP_DEBUG_RECONNECT) \
95 printk(f, ## a); \
96} while (0)
97
98#define esp_log_autosense(f, a...) \
99do { 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
106static 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
117void 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}
131EXPORT_SYMBOL(scsi_esp_cmd);
132
133static 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
148static 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
171static 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
189static 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
206static 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. */
215static 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);
a793804f
DM		 222 if (esp->rev == FAST)
223 esp_write8(ESP_CONFIG2_FENAB, ESP_CFG2);
cd9ad58d
DM		 224 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
225
cd9ad58d
DM		 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
a793804f
DM		 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
cd9ad58d
DM		 321 /* Eat any bitrot in the chip */
322 esp_read8(ESP_INTRPT);
323 udelay(100);
324}
325
326static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
327{
328 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
4c2baaaf 329 struct scatterlist *sg = scsi_sglist(cmd);
cd9ad58d
DM		 330 int dir = cmd->sc_data_direction;
331 int total, i;
332
333 if (dir == DMA_NONE)
334 return;
335
4c2baaaf 336 spriv->u.num_sg = esp->ops->map_sg(esp, sg, scsi_sg_count(cmd), dir);
cd9ad58d
DM		 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
346static 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
361static 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
373static 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
401static 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
4c2baaaf 409 esp->ops->unmap_sg(esp, scsi_sglist(cmd), spriv->u.num_sg, dir);
cd9ad58d
DM		 410}
411
412static 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
426static 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
440static 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
451static 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
463static 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
478static 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
508static 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
515static 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
530static int esp_alloc_lun_tag(struct esp_cmd_entry *ent,
531 struct esp_lun_data *lp)
532{
21af8107 533 if (!ent->orig_tag[0]) {
cd9ad58d
DM		 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
21af8107 567 BUG_ON(lp->tagged_cmds[ent->orig_tag[1]]);
cd9ad58d 568
21af8107 569 lp->tagged_cmds[ent->orig_tag[1]] = ent;
cd9ad58d
DM		 570 lp->num_tagged++;
571
572 return 0;
573}
574
575static void esp_free_lun_tag(struct esp_cmd_entry *ent,
576 struct esp_lun_data *lp)
577{
21af8107
DM		 578 if (ent->orig_tag[0]) {
579 BUG_ON(lp->tagged_cmds[ent->orig_tag[1]] != ent);
580 lp->tagged_cmds[ent->orig_tag[1]] = NULL;
cd9ad58d
DM		 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 */
595static 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
651static 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
50668633 666 if (!spi_populate_tag_msg(&ent->tag[0], cmd)) {
cd9ad58d
DM		 667 ent->tag[0] = 0;
668 ent->tag[1] = 0;
669 }
21af8107
DM		 670 ent->orig_tag[0] = ent->tag[0];
671 ent->orig_tag[1] = ent->tag[1];
cd9ad58d
DM		 672
673 if (esp_alloc_lun_tag(ent, lp) < 0)
674 continue;
675
676 return ent;
677 }
678
679 return NULL;
680}
681
682static void esp_maybe_execute_command(struct esp *esp)
683{
684 struct esp_target_data *tp;
685 struct esp_lun_data *lp;
686 struct scsi_device *dev;
687 struct scsi_cmnd *cmd;
688 struct esp_cmd_entry *ent;
689 int tgt, lun, i;
690 u32 val, start_cmd;
691 u8 *p;
692
693 if (esp->active_cmd ||
694 (esp->flags & ESP_FLAG_RESETTING))
695 return;
696
697 ent = find_and_prep_issuable_command(esp);
698 if (!ent)
699 return;
700
701 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
702 esp_autosense(esp, ent);
703 return;
704 }
705
706 cmd = ent->cmd;
707 dev = cmd->device;
708 tgt = dev->id;
709 lun = dev->lun;
710 tp = &esp->target[tgt];
711 lp = dev->hostdata;
712
63ce2499 713 list_move(&ent->list, &esp->active_cmds);
cd9ad58d
DM		 714
715 esp->active_cmd = ent;
716
717 esp_map_dma(esp, cmd);
718 esp_save_pointers(esp, ent);
719
720 esp_check_command_len(esp, cmd);
721
722 p = esp->command_block;
723
724 esp->msg_out_len = 0;
725 if (tp->flags & ESP_TGT_CHECK_NEGO) {
726 /* Need to negotiate. If the target is broken
727 * go for synchronous transfers and non-wide.
728 */
729 if (tp->flags & ESP_TGT_BROKEN) {
730 tp->flags &= ~ESP_TGT_DISCONNECT;
731 tp->nego_goal_period = 0;
732 tp->nego_goal_offset = 0;
733 tp->nego_goal_width = 0;
734 tp->nego_goal_tags = 0;
735 }
736
737 /* If the settings are not changing, skip this. */
738 if (spi_width(tp->starget) == tp->nego_goal_width &&
739 spi_period(tp->starget) == tp->nego_goal_period &&
740 spi_offset(tp->starget) == tp->nego_goal_offset) {
741 tp->flags &= ~ESP_TGT_CHECK_NEGO;
742 goto build_identify;
743 }
744
745 if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) {
746 esp->msg_out_len =
747 spi_populate_width_msg(&esp->msg_out[0],
748 (tp->nego_goal_width ?
749 1 : 0));
750 tp->flags |= ESP_TGT_NEGO_WIDE;
751 } else if (esp_need_to_nego_sync(tp)) {
752 esp->msg_out_len =
753 spi_populate_sync_msg(&esp->msg_out[0],
754 tp->nego_goal_period,
755 tp->nego_goal_offset);
756 tp->flags |= ESP_TGT_NEGO_SYNC;
757 } else {
758 tp->flags &= ~ESP_TGT_CHECK_NEGO;
759 }
760
761 /* Process it like a slow command. */
762 if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC))
763 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
764 }
765
766build_identify:
767 /* If we don't have a lun-data struct yet, we're probing
768 * so do not disconnect. Also, do not disconnect unless
769 * we have a tag on this command.
770 */
771 if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0])
772 *p++ = IDENTIFY(1, lun);
773 else
774 *p++ = IDENTIFY(0, lun);
775
776 if (ent->tag[0] && esp->rev == ESP100) {
777 /* ESP100 lacks select w/atn3 command, use select
778 * and stop instead.
779 */
780 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
781 }
782
783 if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) {
784 start_cmd = ESP_CMD_DMA | ESP_CMD_SELA;
785 if (ent->tag[0]) {
786 *p++ = ent->tag[0];
787 *p++ = ent->tag[1];
788
789 start_cmd = ESP_CMD_DMA | ESP_CMD_SA3;
790 }
791
792 for (i = 0; i < cmd->cmd_len; i++)
793 *p++ = cmd->cmnd[i];
794
795 esp->select_state = ESP_SELECT_BASIC;
796 } else {
797 esp->cmd_bytes_left = cmd->cmd_len;
798 esp->cmd_bytes_ptr = &cmd->cmnd[0];
799
800 if (ent->tag[0]) {
801 for (i = esp->msg_out_len - 1;
802 i >= 0; i--)
803 esp->msg_out[i + 2] = esp->msg_out[i];
804 esp->msg_out[0] = ent->tag[0];
805 esp->msg_out[1] = ent->tag[1];
806 esp->msg_out_len += 2;
807 }
808
809 start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS;
810 esp->select_state = ESP_SELECT_MSGOUT;
811 }
812 val = tgt;
813 if (esp->rev == FASHME)
814 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
815 esp_write8(val, ESP_BUSID);
816
817 esp_write_tgt_sync(esp, tgt);
818 esp_write_tgt_config3(esp, tgt);
819
820 val = (p - esp->command_block);
821
822 if (esp_debug & ESP_DEBUG_SCSICMD) {
823 printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun);
824 for (i = 0; i < cmd->cmd_len; i++)
825 printk("%02x ", cmd->cmnd[i]);
826 printk("]\n");
827 }
828
829 if (esp->rev == FASHME)
830 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
831 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
832 val, 16, 0, start_cmd);
833}
834
835static struct esp_cmd_entry *esp_get_ent(struct esp *esp)
836{
837 struct list_head *head = &esp->esp_cmd_pool;
838 struct esp_cmd_entry *ret;
839
840 if (list_empty(head)) {
841 ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC);
842 } else {
843 ret = list_entry(head->next, struct esp_cmd_entry, list);
844 list_del(&ret->list);
845 memset(ret, 0, sizeof(*ret));
846 }
847 return ret;
848}
849
850static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent)
851{
852 list_add(&ent->list, &esp->esp_cmd_pool);
853}
854
855static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent,
856 struct scsi_cmnd *cmd, unsigned int result)
857{
858 struct scsi_device *dev = cmd->device;
859 int tgt = dev->id;
860 int lun = dev->lun;
861
862 esp->active_cmd = NULL;
863 esp_unmap_dma(esp, cmd);
864 esp_free_lun_tag(ent, dev->hostdata);
865 cmd->result = result;
866
867 if (ent->eh_done) {
868 complete(ent->eh_done);
869 ent->eh_done = NULL;
870 }
871
872 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
873 esp->ops->unmap_single(esp, ent->sense_dma,
874 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
875 ent->sense_ptr = NULL;
876
877 /* Restore the message/status bytes to what we actually
878 * saw originally. Also, report that we are providing
879 * the sense data.
880 */
881 cmd->result = ((DRIVER_SENSE << 24) |
882 (DID_OK << 16) |
883 (COMMAND_COMPLETE << 8) |
884 (SAM_STAT_CHECK_CONDITION << 0));
885
886 ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE;
887 if (esp_debug & ESP_DEBUG_AUTOSENSE) {
888 int i;
889
890 printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ",
891 esp->host->unique_id, tgt, lun);
892 for (i = 0; i < 18; i++)
893 printk("%02x ", cmd->sense_buffer[i]);
894 printk("]\n");
895 }
896 }
897
898 cmd->scsi_done(cmd);
899
900 list_del(&ent->list);
901 esp_put_ent(esp, ent);
902
903 esp_maybe_execute_command(esp);
904}
905
906static unsigned int compose_result(unsigned int status, unsigned int message,
907 unsigned int driver_code)
908{
909 return (status | (message << 8) | (driver_code << 16));
910}
911
912static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent)
913{
914 struct scsi_device *dev = ent->cmd->device;
915 struct esp_lun_data *lp = dev->hostdata;
916
917 scsi_track_queue_full(dev, lp->num_tagged - 1);
918}
919
f281233d 920static int esp_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
cd9ad58d
DM		 921{
922 struct scsi_device *dev = cmd->device;
2b14ec78 923 struct esp *esp = shost_priv(dev->host);
cd9ad58d
DM		 924 struct esp_cmd_priv *spriv;
925 struct esp_cmd_entry *ent;
926
927 ent = esp_get_ent(esp);
928 if (!ent)
929 return SCSI_MLQUEUE_HOST_BUSY;
930
931 ent->cmd = cmd;
932
933 cmd->scsi_done = done;
934
935 spriv = ESP_CMD_PRIV(cmd);
936 spriv->u.dma_addr = ~(dma_addr_t)0x0;
937
938 list_add_tail(&ent->list, &esp->queued_cmds);
939
940 esp_maybe_execute_command(esp);
941
942 return 0;
943}
944
f281233d
JG		 945static DEF_SCSI_QCMD(esp_queuecommand)
946
cd9ad58d
DM		 947static int esp_check_gross_error(struct esp *esp)
948{
949 if (esp->sreg & ESP_STAT_SPAM) {
950 /* Gross Error, could be one of:
951 * - top of fifo overwritten
952 * - top of command register overwritten
953 * - DMA programmed with wrong direction
954 * - improper phase change
955 */
956 printk(KERN_ERR PFX "esp%d: Gross error sreg[%02x]\n",
957 esp->host->unique_id, esp->sreg);
958 /* XXX Reset the chip. XXX */
959 return 1;
960 }
961 return 0;
962}
963
964static int esp_check_spur_intr(struct esp *esp)
965{
966 switch (esp->rev) {
967 case ESP100:
968 case ESP100A:
969 /* The interrupt pending bit of the status register cannot
970 * be trusted on these revisions.
971 */
972 esp->sreg &= ~ESP_STAT_INTR;
973 break;
974
975 default:
976 if (!(esp->sreg & ESP_STAT_INTR)) {
977 esp->ireg = esp_read8(ESP_INTRPT);
978 if (esp->ireg & ESP_INTR_SR)
979 return 1;
980
981 /* If the DMA is indicating interrupt pending and the
982 * ESP is not, the only possibility is a DMA error.
983 */
984 if (!esp->ops->dma_error(esp)) {
985 printk(KERN_ERR PFX "esp%d: Spurious irq, "
6fe07aaf 986 "sreg=%02x.\n",
cd9ad58d
DM		 987 esp->host->unique_id, esp->sreg);
988 return -1;
989 }
990
991 printk(KERN_ERR PFX "esp%d: DMA error\n",
992 esp->host->unique_id);
993
994 /* XXX Reset the chip. XXX */
995 return -1;
996 }
997 break;
998 }
999
1000 return 0;
1001}
1002
1003static void esp_schedule_reset(struct esp *esp)
1004{
2975b023 1005 esp_log_reset("ESP: esp_schedule_reset() from %pf\n",
cd9ad58d
DM		 1006 __builtin_return_address(0));
1007 esp->flags |= ESP_FLAG_RESETTING;
1008 esp_event(esp, ESP_EVENT_RESET);
1009}
1010
1011/* In order to avoid having to add a special half-reconnected state
1012 * into the driver we just sit here and poll through the rest of
1013 * the reselection process to get the tag message bytes.
1014 */
1015static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp,
1016 struct esp_lun_data *lp)
1017{
1018 struct esp_cmd_entry *ent;
1019 int i;
1020
1021 if (!lp->num_tagged) {
1022 printk(KERN_ERR PFX "esp%d: Reconnect w/num_tagged==0\n",
1023 esp->host->unique_id);
1024 return NULL;
1025 }
1026
1027 esp_log_reconnect("ESP: reconnect tag, ");
1028
1029 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
1030 if (esp->ops->irq_pending(esp))
1031 break;
1032 }
1033 if (i == ESP_QUICKIRQ_LIMIT) {
1034 printk(KERN_ERR PFX "esp%d: Reconnect IRQ1 timeout\n",
1035 esp->host->unique_id);
1036 return NULL;
1037 }
1038
1039 esp->sreg = esp_read8(ESP_STATUS);
1040 esp->ireg = esp_read8(ESP_INTRPT);
1041
1042 esp_log_reconnect("IRQ(%d:%x:%x), ",
1043 i, esp->ireg, esp->sreg);
1044
1045 if (esp->ireg & ESP_INTR_DC) {
1046 printk(KERN_ERR PFX "esp%d: Reconnect, got disconnect.\n",
1047 esp->host->unique_id);
1048 return NULL;
1049 }
1050
1051 if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) {
1052 printk(KERN_ERR PFX "esp%d: Reconnect, not MIP sreg[%02x].\n",
1053 esp->host->unique_id, esp->sreg);
1054 return NULL;
1055 }
1056
1057 /* DMA in the tag bytes... */
1058 esp->command_block[0] = 0xff;
1059 esp->command_block[1] = 0xff;
1060 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1061 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI);
1062
70f23fd6 1063 /* ACK the message. */
cd9ad58d
DM		 1064 scsi_esp_cmd(esp, ESP_CMD_MOK);
1065
1066 for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) {
1067 if (esp->ops->irq_pending(esp)) {
1068 esp->sreg = esp_read8(ESP_STATUS);
1069 esp->ireg = esp_read8(ESP_INTRPT);
1070 if (esp->ireg & ESP_INTR_FDONE)
1071 break;
1072 }
1073 udelay(1);
1074 }
1075 if (i == ESP_RESELECT_TAG_LIMIT) {
1076 printk(KERN_ERR PFX "esp%d: Reconnect IRQ2 timeout\n",
1077 esp->host->unique_id);
1078 return NULL;
1079 }
1080 esp->ops->dma_drain(esp);
1081 esp->ops->dma_invalidate(esp);
1082
1083 esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n",
1084 i, esp->ireg, esp->sreg,
1085 esp->command_block[0],
1086 esp->command_block[1]);
1087
1088 if (esp->command_block[0] < SIMPLE_QUEUE_TAG ||
1089 esp->command_block[0] > ORDERED_QUEUE_TAG) {
1090 printk(KERN_ERR PFX "esp%d: Reconnect, bad tag "
1091 "type %02x.\n",
1092 esp->host->unique_id, esp->command_block[0]);
1093 return NULL;
1094 }
1095
1096 ent = lp->tagged_cmds[esp->command_block[1]];
1097 if (!ent) {
1098 printk(KERN_ERR PFX "esp%d: Reconnect, no entry for "
1099 "tag %02x.\n",
1100 esp->host->unique_id, esp->command_block[1]);
1101 return NULL;
1102 }
1103
1104 return ent;
1105}
1106
1107static int esp_reconnect(struct esp *esp)
1108{
1109 struct esp_cmd_entry *ent;
1110 struct esp_target_data *tp;
1111 struct esp_lun_data *lp;
1112 struct scsi_device *dev;
1113 int target, lun;
1114
1115 BUG_ON(esp->active_cmd);
1116 if (esp->rev == FASHME) {
1117 /* FASHME puts the target and lun numbers directly
1118 * into the fifo.
1119 */
1120 target = esp->fifo[0];
1121 lun = esp->fifo[1] & 0x7;
1122 } else {
1123 u8 bits = esp_read8(ESP_FDATA);
1124
1125 /* Older chips put the lun directly into the fifo, but
1126 * the target is given as a sample of the arbitration
1127 * lines on the bus at reselection time. So we should
1128 * see the ID of the ESP and the one reconnecting target
1129 * set in the bitmap.
1130 */
1131 if (!(bits & esp->scsi_id_mask))
1132 goto do_reset;
1133 bits &= ~esp->scsi_id_mask;
1134 if (!bits || (bits & (bits - 1)))
1135 goto do_reset;
1136
1137 target = ffs(bits) - 1;
1138 lun = (esp_read8(ESP_FDATA) & 0x7);
1139
1140 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1141 if (esp->rev == ESP100) {
1142 u8 ireg = esp_read8(ESP_INTRPT);
1143 /* This chip has a bug during reselection that can
1144 * cause a spurious illegal-command interrupt, which
1145 * we simply ACK here. Another possibility is a bus
1146 * reset so we must check for that.
1147 */
1148 if (ireg & ESP_INTR_SR)
1149 goto do_reset;
1150 }
1151 scsi_esp_cmd(esp, ESP_CMD_NULL);
1152 }
1153
1154 esp_write_tgt_sync(esp, target);
1155 esp_write_tgt_config3(esp, target);
1156
1157 scsi_esp_cmd(esp, ESP_CMD_MOK);
1158
1159 if (esp->rev == FASHME)
1160 esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT,
1161 ESP_BUSID);
1162
1163 tp = &esp->target[target];
1164 dev = __scsi_device_lookup_by_target(tp->starget, lun);
1165 if (!dev) {
1166 printk(KERN_ERR PFX "esp%d: Reconnect, no lp "
1167 "tgt[%u] lun[%u]\n",
1168 esp->host->unique_id, target, lun);
1169 goto do_reset;
1170 }
1171 lp = dev->hostdata;
1172
1173 ent = lp->non_tagged_cmd;
1174 if (!ent) {
1175 ent = esp_reconnect_with_tag(esp, lp);
1176 if (!ent)
1177 goto do_reset;
1178 }
1179
1180 esp->active_cmd = ent;
1181
1182 if (ent->flags & ESP_CMD_FLAG_ABORT) {
1183 esp->msg_out[0] = ABORT_TASK_SET;
1184 esp->msg_out_len = 1;
1185 scsi_esp_cmd(esp, ESP_CMD_SATN);
1186 }
1187
1188 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1189 esp_restore_pointers(esp, ent);
1190 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1191 return 1;
1192
1193do_reset:
1194 esp_schedule_reset(esp);
1195 return 0;
1196}
1197
1198static int esp_finish_select(struct esp *esp)
1199{
1200 struct esp_cmd_entry *ent;
1201 struct scsi_cmnd *cmd;
1202 u8 orig_select_state;
1203
1204 orig_select_state = esp->select_state;
1205
1206 /* No longer selecting. */
1207 esp->select_state = ESP_SELECT_NONE;
1208
1209 esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS;
1210 ent = esp->active_cmd;
1211 cmd = ent->cmd;
1212
1213 if (esp->ops->dma_error(esp)) {
1214 /* If we see a DMA error during or as a result of selection,
1215 * all bets are off.
1216 */
1217 esp_schedule_reset(esp);
1218 esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16));
1219 return 0;
1220 }
1221
1222 esp->ops->dma_invalidate(esp);
1223
1224 if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
1225 struct esp_target_data *tp = &esp->target[cmd->device->id];
1226
1227 /* Carefully back out of the selection attempt. Release
1228 * resources (such as DMA mapping & TAG) and reset state (such
1229 * as message out and command delivery variables).
1230 */
1231 if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1232 esp_unmap_dma(esp, cmd);
1233 esp_free_lun_tag(ent, cmd->device->hostdata);
1234 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE);
1235 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
1236 esp->cmd_bytes_ptr = NULL;
1237 esp->cmd_bytes_left = 0;
1238 } else {
1239 esp->ops->unmap_single(esp, ent->sense_dma,
1240 SCSI_SENSE_BUFFERSIZE,
1241 DMA_FROM_DEVICE);
1242 ent->sense_ptr = NULL;
1243 }
1244
1245 /* Now that the state is unwound properly, put back onto
1246 * the issue queue. This command is no longer active.
1247 */
63ce2499 1248 list_move(&ent->list, &esp->queued_cmds);
cd9ad58d
DM		 1249 esp->active_cmd = NULL;
1250
1251 /* Return value ignored by caller, it directly invokes
1252 * esp_reconnect().
1253 */
1254 return 0;
1255 }
1256
1257 if (esp->ireg == ESP_INTR_DC) {
1258 struct scsi_device *dev = cmd->device;
1259
1260 /* Disconnect. Make sure we re-negotiate sync and
1261 * wide parameters if this target starts responding
1262 * again in the future.
1263 */
1264 esp->target[dev->id].flags |= ESP_TGT_CHECK_NEGO;
1265
1266 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1267 esp_cmd_is_done(esp, ent, cmd, (DID_BAD_TARGET << 16));
1268 return 1;
1269 }
1270
1271 if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
1272 /* Selection successful. On pre-FAST chips we have
1273 * to do a NOP and possibly clean out the FIFO.
1274 */
1275 if (esp->rev <= ESP236) {
1276 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1277
1278 scsi_esp_cmd(esp, ESP_CMD_NULL);
1279
1280 if (!fcnt &&
1281 (!esp->prev_soff ||
1282 ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
1283 esp_flush_fifo(esp);
1284 }
1285
1286 /* If we are doing a slow command, negotiation, etc.
1287 * we'll do the right thing as we transition to the
1288 * next phase.
1289 */
1290 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1291 return 0;
1292 }
1293
1294 printk("ESP: Unexpected selection completion ireg[%x].\n",
1295 esp->ireg);
1296 esp_schedule_reset(esp);
1297 return 0;
1298}
1299
1300static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,
1301 struct scsi_cmnd *cmd)
1302{
1303 int fifo_cnt, ecount, bytes_sent, flush_fifo;
1304
1305 fifo_cnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1306 if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE)
1307 fifo_cnt <<= 1;
1308
1309 ecount = 0;
1310 if (!(esp->sreg & ESP_STAT_TCNT)) {
1311 ecount = ((unsigned int)esp_read8(ESP_TCLOW) |
1312 (((unsigned int)esp_read8(ESP_TCMED)) << 8));
1313 if (esp->rev == FASHME)
1314 ecount |= ((unsigned int)esp_read8(FAS_RLO)) << 16;
1315 }
1316
1317 bytes_sent = esp->data_dma_len;
1318 bytes_sent -= ecount;
1319
1320 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1321 bytes_sent -= fifo_cnt;
1322
1323 flush_fifo = 0;
1324 if (!esp->prev_soff) {
1325 /* Synchronous data transfer, always flush fifo. */
1326 flush_fifo = 1;
1327 } else {
1328 if (esp->rev == ESP100) {
1329 u32 fflags, phase;
1330
1331 /* ESP100 has a chip bug where in the synchronous data
1332 * phase it can mistake a final long REQ pulse from the
1333 * target as an extra data byte. Fun.
1334 *
1335 * To detect this case we resample the status register
1336 * and fifo flags. If we're still in a data phase and
1337 * we see spurious chunks in the fifo, we return error
1338 * to the caller which should reset and set things up
1339 * such that we only try future transfers to this
1340 * target in synchronous mode.
1341 */
1342 esp->sreg = esp_read8(ESP_STATUS);
1343 phase = esp->sreg & ESP_STAT_PMASK;
1344 fflags = esp_read8(ESP_FFLAGS);
1345
1346 if ((phase == ESP_DOP &&
1347 (fflags & ESP_FF_ONOTZERO)) ||
1348 (phase == ESP_DIP &&
1349 (fflags & ESP_FF_FBYTES)))
1350 return -1;
1351 }
1352 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1353 flush_fifo = 1;
1354 }
1355
1356 if (flush_fifo)
1357 esp_flush_fifo(esp);
1358
1359 return bytes_sent;
1360}
1361
1362static void esp_setsync(struct esp *esp, struct esp_target_data *tp,
1363 u8 scsi_period, u8 scsi_offset,
1364 u8 esp_stp, u8 esp_soff)
1365{
1366 spi_period(tp->starget) = scsi_period;
1367 spi_offset(tp->starget) = scsi_offset;
1368 spi_width(tp->starget) = (tp->flags & ESP_TGT_WIDE) ? 1 : 0;
1369
1370 if (esp_soff) {
1371 esp_stp &= 0x1f;
1372 esp_soff |= esp->radelay;
1373 if (esp->rev >= FAS236) {
1374 u8 bit = ESP_CONFIG3_FSCSI;
1375 if (esp->rev >= FAS100A)
1376 bit = ESP_CONFIG3_FAST;
1377
1378 if (scsi_period < 50) {
1379 if (esp->rev == FASHME)
1380 esp_soff &= ~esp->radelay;
1381 tp->esp_config3 |= bit;
1382 } else {
1383 tp->esp_config3 &= ~bit;
1384 }
1385 esp->prev_cfg3 = tp->esp_config3;
1386 esp_write8(esp->prev_cfg3, ESP_CFG3);
1387 }
1388 }
1389
1390 tp->esp_period = esp->prev_stp = esp_stp;
1391 tp->esp_offset = esp->prev_soff = esp_soff;
1392
1393 esp_write8(esp_soff, ESP_SOFF);
1394 esp_write8(esp_stp, ESP_STP);
1395
1396 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1397
1398 spi_display_xfer_agreement(tp->starget);
1399}
1400
1401static void esp_msgin_reject(struct esp *esp)
1402{
1403 struct esp_cmd_entry *ent = esp->active_cmd;
1404 struct scsi_cmnd *cmd = ent->cmd;
1405 struct esp_target_data *tp;
1406 int tgt;
1407
1408 tgt = cmd->device->id;
1409 tp = &esp->target[tgt];
1410
1411 if (tp->flags & ESP_TGT_NEGO_WIDE) {
1412 tp->flags &= ~(ESP_TGT_NEGO_WIDE | ESP_TGT_WIDE);
1413
1414 if (!esp_need_to_nego_sync(tp)) {
1415 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1416 scsi_esp_cmd(esp, ESP_CMD_RATN);
1417 } else {
1418 esp->msg_out_len =
1419 spi_populate_sync_msg(&esp->msg_out[0],
1420 tp->nego_goal_period,
1421 tp->nego_goal_offset);
1422 tp->flags |= ESP_TGT_NEGO_SYNC;
1423 scsi_esp_cmd(esp, ESP_CMD_SATN);
1424 }
1425 return;
1426 }
1427
1428 if (tp->flags & ESP_TGT_NEGO_SYNC) {
1429 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1430 tp->esp_period = 0;
1431 tp->esp_offset = 0;
1432 esp_setsync(esp, tp, 0, 0, 0, 0);
1433 scsi_esp_cmd(esp, ESP_CMD_RATN);
1434 return;
1435 }
1436
1437 esp->msg_out[0] = ABORT_TASK_SET;
1438 esp->msg_out_len = 1;
1439 scsi_esp_cmd(esp, ESP_CMD_SATN);
1440}
1441
1442static void esp_msgin_sdtr(struct esp *esp, struct esp_target_data *tp)
1443{
1444 u8 period = esp->msg_in[3];
1445 u8 offset = esp->msg_in[4];
1446 u8 stp;
1447
1448 if (!(tp->flags & ESP_TGT_NEGO_SYNC))
1449 goto do_reject;
1450
1451 if (offset > 15)
1452 goto do_reject;
1453
1454 if (offset) {
237abac6 1455 int one_clock;
cd9ad58d
DM		 1456
1457 if (period > esp->max_period) {
1458 period = offset = 0;
1459 goto do_sdtr;
1460 }
1461 if (period < esp->min_period)
1462 goto do_reject;
1463
1464 one_clock = esp->ccycle / 1000;
237abac6 1465 stp = DIV_ROUND_UP(period << 2, one_clock);
cd9ad58d
DM		 1466 if (stp && esp->rev >= FAS236) {
1467 if (stp >= 50)
1468 stp--;
1469 }
1470 } else {
1471 stp = 0;
1472 }
1473
1474 esp_setsync(esp, tp, period, offset, stp, offset);
1475 return;
1476
1477do_reject:
1478 esp->msg_out[0] = MESSAGE_REJECT;
1479 esp->msg_out_len = 1;
1480 scsi_esp_cmd(esp, ESP_CMD_SATN);
1481 return;
1482
1483do_sdtr:
1484 tp->nego_goal_period = period;
1485 tp->nego_goal_offset = offset;
1486 esp->msg_out_len =
1487 spi_populate_sync_msg(&esp->msg_out[0],
1488 tp->nego_goal_period,
1489 tp->nego_goal_offset);
1490 scsi_esp_cmd(esp, ESP_CMD_SATN);
1491}
1492
1493static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp)
1494{
1495 int size = 8 << esp->msg_in[3];
1496 u8 cfg3;
1497
1498 if (esp->rev != FASHME)
1499 goto do_reject;
1500
1501 if (size != 8 && size != 16)
1502 goto do_reject;
1503
1504 if (!(tp->flags & ESP_TGT_NEGO_WIDE))
1505 goto do_reject;
1506
1507 cfg3 = tp->esp_config3;
1508 if (size == 16) {
1509 tp->flags |= ESP_TGT_WIDE;
1510 cfg3 |= ESP_CONFIG3_EWIDE;
1511 } else {
1512 tp->flags &= ~ESP_TGT_WIDE;
1513 cfg3 &= ~ESP_CONFIG3_EWIDE;
1514 }
1515 tp->esp_config3 = cfg3;
1516 esp->prev_cfg3 = cfg3;
1517 esp_write8(cfg3, ESP_CFG3);
1518
1519 tp->flags &= ~ESP_TGT_NEGO_WIDE;
1520
1521 spi_period(tp->starget) = 0;
1522 spi_offset(tp->starget) = 0;
1523 if (!esp_need_to_nego_sync(tp)) {
1524 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1525 scsi_esp_cmd(esp, ESP_CMD_RATN);
1526 } else {
1527 esp->msg_out_len =
1528 spi_populate_sync_msg(&esp->msg_out[0],
1529 tp->nego_goal_period,
1530 tp->nego_goal_offset);
1531 tp->flags |= ESP_TGT_NEGO_SYNC;
1532 scsi_esp_cmd(esp, ESP_CMD_SATN);
1533 }
1534 return;
1535
1536do_reject:
1537 esp->msg_out[0] = MESSAGE_REJECT;
1538 esp->msg_out_len = 1;
1539 scsi_esp_cmd(esp, ESP_CMD_SATN);
1540}
1541
1542static void esp_msgin_extended(struct esp *esp)
1543{
1544 struct esp_cmd_entry *ent = esp->active_cmd;
1545 struct scsi_cmnd *cmd = ent->cmd;
1546 struct esp_target_data *tp;
1547 int tgt = cmd->device->id;
1548
1549 tp = &esp->target[tgt];
1550 if (esp->msg_in[2] == EXTENDED_SDTR) {
1551 esp_msgin_sdtr(esp, tp);
1552 return;
1553 }
1554 if (esp->msg_in[2] == EXTENDED_WDTR) {
1555 esp_msgin_wdtr(esp, tp);
1556 return;
1557 }
1558
1559 printk("ESP: Unexpected extended msg type %x\n",
1560 esp->msg_in[2]);
1561
1562 esp->msg_out[0] = ABORT_TASK_SET;
1563 esp->msg_out_len = 1;
1564 scsi_esp_cmd(esp, ESP_CMD_SATN);
1565}
1566
1567/* Analyze msgin bytes received from target so far. Return non-zero
1568 * if there are more bytes needed to complete the message.
1569 */
1570static int esp_msgin_process(struct esp *esp)
1571{
1572 u8 msg0 = esp->msg_in[0];
1573 int len = esp->msg_in_len;
1574
1575 if (msg0 & 0x80) {
1576 /* Identify */
1577 printk("ESP: Unexpected msgin identify\n");
1578 return 0;
1579 }
1580
1581 switch (msg0) {
1582 case EXTENDED_MESSAGE:
1583 if (len == 1)
1584 return 1;
1585 if (len < esp->msg_in[1] + 2)
1586 return 1;
1587 esp_msgin_extended(esp);
1588 return 0;
1589
1590 case IGNORE_WIDE_RESIDUE: {
1591 struct esp_cmd_entry *ent;
1592 struct esp_cmd_priv *spriv;
1593 if (len == 1)
1594 return 1;
1595
1596 if (esp->msg_in[1] != 1)
1597 goto do_reject;
1598
1599 ent = esp->active_cmd;
1600 spriv = ESP_CMD_PRIV(ent->cmd);
1601
1602 if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) {
1603 spriv->cur_sg--;
1604 spriv->cur_residue = 1;
1605 } else
1606 spriv->cur_residue++;
1607 spriv->tot_residue++;
1608 return 0;
1609 }
1610 case NOP:
1611 return 0;
1612 case RESTORE_POINTERS:
1613 esp_restore_pointers(esp, esp->active_cmd);
1614 return 0;
1615 case SAVE_POINTERS:
1616 esp_save_pointers(esp, esp->active_cmd);
1617 return 0;
1618
1619 case COMMAND_COMPLETE:
1620 case DISCONNECT: {
1621 struct esp_cmd_entry *ent = esp->active_cmd;
1622
1623 ent->message = msg0;
1624 esp_event(esp, ESP_EVENT_FREE_BUS);
1625 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1626 return 0;
1627 }
1628 case MESSAGE_REJECT:
1629 esp_msgin_reject(esp);
1630 return 0;
1631
1632 default:
1633 do_reject:
1634 esp->msg_out[0] = MESSAGE_REJECT;
1635 esp->msg_out_len = 1;
1636 scsi_esp_cmd(esp, ESP_CMD_SATN);
1637 return 0;
1638 }
1639}
1640
1641static int esp_process_event(struct esp *esp)
1642{
1643 int write;
1644
1645again:
1646 write = 0;
1647 switch (esp->event) {
1648 case ESP_EVENT_CHECK_PHASE:
1649 switch (esp->sreg & ESP_STAT_PMASK) {
1650 case ESP_DOP:
1651 esp_event(esp, ESP_EVENT_DATA_OUT);
1652 break;
1653 case ESP_DIP:
1654 esp_event(esp, ESP_EVENT_DATA_IN);
1655 break;
1656 case ESP_STATP:
1657 esp_flush_fifo(esp);
1658 scsi_esp_cmd(esp, ESP_CMD_ICCSEQ);
1659 esp_event(esp, ESP_EVENT_STATUS);
1660 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1661 return 1;
1662
1663 case ESP_MOP:
1664 esp_event(esp, ESP_EVENT_MSGOUT);
1665 break;
1666
1667 case ESP_MIP:
1668 esp_event(esp, ESP_EVENT_MSGIN);
1669 break;
1670
1671 case ESP_CMDP:
1672 esp_event(esp, ESP_EVENT_CMD_START);
1673 break;
1674
1675 default:
1676 printk("ESP: Unexpected phase, sreg=%02x\n",
1677 esp->sreg);
1678 esp_schedule_reset(esp);
1679 return 0;
1680 }
1681 goto again;
1682 break;
1683
1684 case ESP_EVENT_DATA_IN:
1685 write = 1;
1686 /* fallthru */
1687
1688 case ESP_EVENT_DATA_OUT: {
1689 struct esp_cmd_entry *ent = esp->active_cmd;
1690 struct scsi_cmnd *cmd = ent->cmd;
1691 dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd);
1692 unsigned int dma_len = esp_cur_dma_len(ent, cmd);
1693
1694 if (esp->rev == ESP100)
1695 scsi_esp_cmd(esp, ESP_CMD_NULL);
1696
1697 if (write)
1698 ent->flags |= ESP_CMD_FLAG_WRITE;
1699 else
1700 ent->flags &= ~ESP_CMD_FLAG_WRITE;
1701
6fe07aaf
FT		 1702 if (esp->ops->dma_length_limit)
1703 dma_len = esp->ops->dma_length_limit(esp, dma_addr,
1704 dma_len);
1705 else
1706 dma_len = esp_dma_length_limit(esp, dma_addr, dma_len);
1707
cd9ad58d
DM		 1708 esp->data_dma_len = dma_len;
1709
1710 if (!dma_len) {
1711 printk(KERN_ERR PFX "esp%d: DMA length is zero!\n",
1712 esp->host->unique_id);
e1f2a094 1713 printk(KERN_ERR PFX "esp%d: cur adr[%08llx] len[%08x]\n",
cd9ad58d 1714 esp->host->unique_id,
e1f2a094 1715 (unsigned long long)esp_cur_dma_addr(ent, cmd),
cd9ad58d
DM		 1716 esp_cur_dma_len(ent, cmd));
1717 esp_schedule_reset(esp);
1718 return 0;
1719 }
1720
e1f2a094 1721 esp_log_datastart("ESP: start data addr[%08llx] len[%u] "
cd9ad58d 1722 "write(%d)\n",
e1f2a094 1723 (unsigned long long)dma_addr, dma_len, write);
cd9ad58d
DM		 1724
1725 esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len,
1726 write, ESP_CMD_DMA | ESP_CMD_TI);
1727 esp_event(esp, ESP_EVENT_DATA_DONE);
1728 break;
1729 }
1730 case ESP_EVENT_DATA_DONE: {
1731 struct esp_cmd_entry *ent = esp->active_cmd;
1732 struct scsi_cmnd *cmd = ent->cmd;
1733 int bytes_sent;
1734
1735 if (esp->ops->dma_error(esp)) {
1736 printk("ESP: data done, DMA error, resetting\n");
1737 esp_schedule_reset(esp);
1738 return 0;
1739 }
1740
1741 if (ent->flags & ESP_CMD_FLAG_WRITE) {
1742 /* XXX parity errors, etc. XXX */
1743
1744 esp->ops->dma_drain(esp);
1745 }
1746 esp->ops->dma_invalidate(esp);
1747
1748 if (esp->ireg != ESP_INTR_BSERV) {
1749 /* We should always see exactly a bus-service
1750 * interrupt at the end of a successful transfer.
1751 */
1752 printk("ESP: data done, not BSERV, resetting\n");
1753 esp_schedule_reset(esp);
1754 return 0;
1755 }
1756
1757 bytes_sent = esp_data_bytes_sent(esp, ent, cmd);
1758
1759 esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n",
1760 ent->flags, bytes_sent);
1761
1762 if (bytes_sent < 0) {
1763 /* XXX force sync mode for this target XXX */
1764 esp_schedule_reset(esp);
1765 return 0;
1766 }
1767
1768 esp_advance_dma(esp, ent, cmd, bytes_sent);
1769 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1770 goto again;
cd9ad58d
DM		 1771 }
1772
1773 case ESP_EVENT_STATUS: {
1774 struct esp_cmd_entry *ent = esp->active_cmd;
1775
1776 if (esp->ireg & ESP_INTR_FDONE) {
1777 ent->status = esp_read8(ESP_FDATA);
1778 ent->message = esp_read8(ESP_FDATA);
1779 scsi_esp_cmd(esp, ESP_CMD_MOK);
1780 } else if (esp->ireg == ESP_INTR_BSERV) {
1781 ent->status = esp_read8(ESP_FDATA);
1782 ent->message = 0xff;
1783 esp_event(esp, ESP_EVENT_MSGIN);
1784 return 0;
1785 }
1786
1787 if (ent->message != COMMAND_COMPLETE) {
1788 printk("ESP: Unexpected message %x in status\n",
1789 ent->message);
1790 esp_schedule_reset(esp);
1791 return 0;
1792 }
1793
1794 esp_event(esp, ESP_EVENT_FREE_BUS);
1795 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1796 break;
1797 }
1798 case ESP_EVENT_FREE_BUS: {
1799 struct esp_cmd_entry *ent = esp->active_cmd;
1800 struct scsi_cmnd *cmd = ent->cmd;
1801
1802 if (ent->message == COMMAND_COMPLETE ||
1803 ent->message == DISCONNECT)
1804 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1805
1806 if (ent->message == COMMAND_COMPLETE) {
1807 esp_log_cmddone("ESP: Command done status[%x] "
1808 "message[%x]\n",
1809 ent->status, ent->message);
1810 if (ent->status == SAM_STAT_TASK_SET_FULL)
1811 esp_event_queue_full(esp, ent);
1812
1813 if (ent->status == SAM_STAT_CHECK_CONDITION &&
1814 !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1815 ent->flags |= ESP_CMD_FLAG_AUTOSENSE;
1816 esp_autosense(esp, ent);
1817 } else {
1818 esp_cmd_is_done(esp, ent, cmd,
1819 compose_result(ent->status,
1820 ent->message,
1821 DID_OK));
1822 }
1823 } else if (ent->message == DISCONNECT) {
1824 esp_log_disconnect("ESP: Disconnecting tgt[%d] "
1825 "tag[%x:%x]\n",
1826 cmd->device->id,
1827 ent->tag[0], ent->tag[1]);
1828
1829 esp->active_cmd = NULL;
1830 esp_maybe_execute_command(esp);
1831 } else {
1832 printk("ESP: Unexpected message %x in freebus\n",
1833 ent->message);
1834 esp_schedule_reset(esp);
1835 return 0;
1836 }
1837 if (esp->active_cmd)
1838 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1839 break;
1840 }
1841 case ESP_EVENT_MSGOUT: {
1842 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1843
1844 if (esp_debug & ESP_DEBUG_MSGOUT) {
1845 int i;
1846 printk("ESP: Sending message [ ");
1847 for (i = 0; i < esp->msg_out_len; i++)
1848 printk("%02x ", esp->msg_out[i]);
1849 printk("]\n");
1850 }
1851
1852 if (esp->rev == FASHME) {
1853 int i;
1854
1855 /* Always use the fifo. */
1856 for (i = 0; i < esp->msg_out_len; i++) {
1857 esp_write8(esp->msg_out[i], ESP_FDATA);
1858 esp_write8(0, ESP_FDATA);
1859 }
1860 scsi_esp_cmd(esp, ESP_CMD_TI);
1861 } else {
1862 if (esp->msg_out_len == 1) {
1863 esp_write8(esp->msg_out[0], ESP_FDATA);
1864 scsi_esp_cmd(esp, ESP_CMD_TI);
1865 } else {
1866 /* Use DMA. */
1867 memcpy(esp->command_block,
1868 esp->msg_out,
1869 esp->msg_out_len);
1870
1871 esp->ops->send_dma_cmd(esp,
1872 esp->command_block_dma,
1873 esp->msg_out_len,
1874 esp->msg_out_len,
1875 0,
1876 ESP_CMD_DMA|ESP_CMD_TI);
1877 }
1878 }
1879 esp_event(esp, ESP_EVENT_MSGOUT_DONE);
1880 break;
1881 }
1882 case ESP_EVENT_MSGOUT_DONE:
1883 if (esp->rev == FASHME) {
1884 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1885 } else {
1886 if (esp->msg_out_len > 1)
1887 esp->ops->dma_invalidate(esp);
1888 }
1889
1890 if (!(esp->ireg & ESP_INTR_DC)) {
1891 if (esp->rev != FASHME)
1892 scsi_esp_cmd(esp, ESP_CMD_NULL);
1893 }
1894 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1895 goto again;
1896 case ESP_EVENT_MSGIN:
1897 if (esp->ireg & ESP_INTR_BSERV) {
1898 if (esp->rev == FASHME) {
1899 if (!(esp_read8(ESP_STATUS2) &
1900 ESP_STAT2_FEMPTY))
1901 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1902 } else {
1903 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1904 if (esp->rev == ESP100)
1905 scsi_esp_cmd(esp, ESP_CMD_NULL);
1906 }
1907 scsi_esp_cmd(esp, ESP_CMD_TI);
1908 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1909 return 1;
1910 }
1911 if (esp->ireg & ESP_INTR_FDONE) {
1912 u8 val;
1913
1914 if (esp->rev == FASHME)
1915 val = esp->fifo[0];
1916 else
1917 val = esp_read8(ESP_FDATA);
1918 esp->msg_in[esp->msg_in_len++] = val;
1919
1920 esp_log_msgin("ESP: Got msgin byte %x\n", val);
1921
1922 if (!esp_msgin_process(esp))
1923 esp->msg_in_len = 0;
1924
1925 if (esp->rev == FASHME)
1926 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1927
1928 scsi_esp_cmd(esp, ESP_CMD_MOK);
1929
1930 if (esp->event != ESP_EVENT_FREE_BUS)
1931 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1932 } else {
1933 printk("ESP: MSGIN neither BSERV not FDON, resetting");
1934 esp_schedule_reset(esp);
1935 return 0;
1936 }
1937 break;
1938 case ESP_EVENT_CMD_START:
1939 memcpy(esp->command_block, esp->cmd_bytes_ptr,
1940 esp->cmd_bytes_left);
1941 if (esp->rev == FASHME)
1942 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1943 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1944 esp->cmd_bytes_left, 16, 0,
1945 ESP_CMD_DMA | ESP_CMD_TI);
1946 esp_event(esp, ESP_EVENT_CMD_DONE);
1947 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1948 break;
1949 case ESP_EVENT_CMD_DONE:
1950 esp->ops->dma_invalidate(esp);
1951 if (esp->ireg & ESP_INTR_BSERV) {
1952 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1953 goto again;
1954 }
1955 esp_schedule_reset(esp);
1956 return 0;
1957 break;
1958
1959 case ESP_EVENT_RESET:
1960 scsi_esp_cmd(esp, ESP_CMD_RS);
1961 break;
1962
1963 default:
1964 printk("ESP: Unexpected event %x, resetting\n",
1965 esp->event);
1966 esp_schedule_reset(esp);
1967 return 0;
1968 break;
1969 }
1970 return 1;
1971}
1972
1973static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent)
1974{
1975 struct scsi_cmnd *cmd = ent->cmd;
1976
1977 esp_unmap_dma(esp, cmd);
1978 esp_free_lun_tag(ent, cmd->device->hostdata);
1979 cmd->result = DID_RESET << 16;
1980
1981 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
1982 esp->ops->unmap_single(esp, ent->sense_dma,
1983 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1984 ent->sense_ptr = NULL;
1985 }
1986
1987 cmd->scsi_done(cmd);
1988 list_del(&ent->list);
1989 esp_put_ent(esp, ent);
1990}
1991
1992static void esp_clear_hold(struct scsi_device *dev, void *data)
1993{
1994 struct esp_lun_data *lp = dev->hostdata;
1995
1996 BUG_ON(lp->num_tagged);
1997 lp->hold = 0;
1998}
1999
2000static void esp_reset_cleanup(struct esp *esp)
2001{
2002 struct esp_cmd_entry *ent, *tmp;
2003 int i;
2004
2005 list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) {
2006 struct scsi_cmnd *cmd = ent->cmd;
2007
2008 list_del(&ent->list);
2009 cmd->result = DID_RESET << 16;
2010 cmd->scsi_done(cmd);
2011 esp_put_ent(esp, ent);
2012 }
2013
2014 list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) {
2015 if (ent == esp->active_cmd)
2016 esp->active_cmd = NULL;
2017 esp_reset_cleanup_one(esp, ent);
2018 }
2019
2020 BUG_ON(esp->active_cmd != NULL);
2021
2022 /* Force renegotiation of sync/wide transfers. */
2023 for (i = 0; i < ESP_MAX_TARGET; i++) {
2024 struct esp_target_data *tp = &esp->target[i];
2025
2026 tp->esp_period = 0;
2027 tp->esp_offset = 0;
2028 tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE |
2029 ESP_CONFIG3_FSCSI |
2030 ESP_CONFIG3_FAST);
2031 tp->flags &= ~ESP_TGT_WIDE;
2032 tp->flags |= ESP_TGT_CHECK_NEGO;
2033
2034 if (tp->starget)
522939d4
MR		 2035 __starget_for_each_device(tp->starget, NULL,
2036 esp_clear_hold);
cd9ad58d 2037 }
204abf28 2038 esp->flags &= ~ESP_FLAG_RESETTING;
cd9ad58d
DM		 2039}
2040
2041/* Runs under host->lock */
2042static void __esp_interrupt(struct esp *esp)
2043{
2044 int finish_reset, intr_done;
2045 u8 phase;
2046
2047 esp->sreg = esp_read8(ESP_STATUS);
2048
2049 if (esp->flags & ESP_FLAG_RESETTING) {
2050 finish_reset = 1;
2051 } else {
2052 if (esp_check_gross_error(esp))
2053 return;
2054
2055 finish_reset = esp_check_spur_intr(esp);
2056 if (finish_reset < 0)
2057 return;
2058 }
2059
2060 esp->ireg = esp_read8(ESP_INTRPT);
2061
2062 if (esp->ireg & ESP_INTR_SR)
2063 finish_reset = 1;
2064
2065 if (finish_reset) {
2066 esp_reset_cleanup(esp);
2067 if (esp->eh_reset) {
2068 complete(esp->eh_reset);
2069 esp->eh_reset = NULL;
2070 }
2071 return;
2072 }
2073
2074 phase = (esp->sreg & ESP_STAT_PMASK);
2075 if (esp->rev == FASHME) {
2076 if (((phase != ESP_DIP && phase != ESP_DOP) &&
2077 esp->select_state == ESP_SELECT_NONE &&
2078 esp->event != ESP_EVENT_STATUS &&
2079 esp->event != ESP_EVENT_DATA_DONE) ||
2080 (esp->ireg & ESP_INTR_RSEL)) {
2081 esp->sreg2 = esp_read8(ESP_STATUS2);
2082 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2083 (esp->sreg2 & ESP_STAT2_F1BYTE))
2084 hme_read_fifo(esp);
2085 }
2086 }
2087
2088 esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] "
2089 "sreg2[%02x] ireg[%02x]\n",
2090 esp->sreg, esp->seqreg, esp->sreg2, esp->ireg);
2091
2092 intr_done = 0;
2093
2094 if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) {
2095 printk("ESP: unexpected IREG %02x\n", esp->ireg);
2096 if (esp->ireg & ESP_INTR_IC)
2097 esp_dump_cmd_log(esp);
2098
2099 esp_schedule_reset(esp);
2100 } else {
2101 if (!(esp->ireg & ESP_INTR_RSEL)) {
2102 /* Some combination of FDONE, BSERV, DC. */
2103 if (esp->select_state != ESP_SELECT_NONE)
2104 intr_done = esp_finish_select(esp);
2105 } else if (esp->ireg & ESP_INTR_RSEL) {
2106 if (esp->active_cmd)
2107 (void) esp_finish_select(esp);
2108 intr_done = esp_reconnect(esp);
2109 }
2110 }
2111 while (!intr_done)
2112 intr_done = esp_process_event(esp);
2113}
2114
2115irqreturn_t scsi_esp_intr(int irq, void *dev_id)
2116{
2117 struct esp *esp = dev_id;
2118 unsigned long flags;
2119 irqreturn_t ret;
2120
2121 spin_lock_irqsave(esp->host->host_lock, flags);
2122 ret = IRQ_NONE;
2123 if (esp->ops->irq_pending(esp)) {
2124 ret = IRQ_HANDLED;
2125 for (;;) {
2126 int i;
2127
2128 __esp_interrupt(esp);
2129 if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK))
2130 break;
2131 esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK;
2132
2133 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
2134 if (esp->ops->irq_pending(esp))
2135 break;
2136 }
2137 if (i == ESP_QUICKIRQ_LIMIT)
2138 break;
2139 }
2140 }
2141 spin_unlock_irqrestore(esp->host->host_lock, flags);
2142
2143 return ret;
2144}
2145EXPORT_SYMBOL(scsi_esp_intr);
2146
76246808 2147static void esp_get_revision(struct esp *esp)
cd9ad58d
DM		 2148{
2149 u8 val;
2150
2151 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
2152 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
2153 esp_write8(esp->config2, ESP_CFG2);
2154
2155 val = esp_read8(ESP_CFG2);
2156 val &= ~ESP_CONFIG2_MAGIC;
2157 if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
2158 /* If what we write to cfg2 does not come back, cfg2 is not
2159 * implemented, therefore this must be a plain esp100.
2160 */
2161 esp->rev = ESP100;
2162 } else {
2163 esp->config2 = 0;
2164 esp_set_all_config3(esp, 5);
2165 esp->prev_cfg3 = 5;
2166 esp_write8(esp->config2, ESP_CFG2);
2167 esp_write8(0, ESP_CFG3);
2168 esp_write8(esp->prev_cfg3, ESP_CFG3);
2169
2170 val = esp_read8(ESP_CFG3);
2171 if (val != 5) {
2172 /* The cfg2 register is implemented, however
2173 * cfg3 is not, must be esp100a.
2174 */
2175 esp->rev = ESP100A;
2176 } else {
2177 esp_set_all_config3(esp, 0);
2178 esp->prev_cfg3 = 0;
2179 esp_write8(esp->prev_cfg3, ESP_CFG3);
2180
2181 /* All of cfg{1,2,3} implemented, must be one of
2182 * the fas variants, figure out which one.
2183 */
2184 if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) {
2185 esp->rev = FAST;
2186 esp->sync_defp = SYNC_DEFP_FAST;
2187 } else {
2188 esp->rev = ESP236;
2189 }
2190 esp->config2 = 0;
2191 esp_write8(esp->config2, ESP_CFG2);
2192 }
2193 }
2194}
2195
76246808 2196static void esp_init_swstate(struct esp *esp)
cd9ad58d
DM		 2197{
2198 int i;
2199
2200 INIT_LIST_HEAD(&esp->queued_cmds);
2201 INIT_LIST_HEAD(&esp->active_cmds);
2202 INIT_LIST_HEAD(&esp->esp_cmd_pool);
2203
2204 /* Start with a clear state, domain validation (via ->slave_configure,
2205 * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged
2206 * commands.
2207 */
2208 for (i = 0 ; i < ESP_MAX_TARGET; i++) {
2209 esp->target[i].flags = 0;
2210 esp->target[i].nego_goal_period = 0;
2211 esp->target[i].nego_goal_offset = 0;
2212 esp->target[i].nego_goal_width = 0;
2213 esp->target[i].nego_goal_tags = 0;
2214 }
2215}
2216
2217/* This places the ESP into a known state at boot time. */
d679f805 2218static void esp_bootup_reset(struct esp *esp)
cd9ad58d
DM		 2219{
2220 u8 val;
2221
2222 /* Reset the DMA */
2223 esp->ops->reset_dma(esp);
2224
2225 /* Reset the ESP */
2226 esp_reset_esp(esp);
2227
2228 /* Reset the SCSI bus, but tell ESP not to generate an irq */
2229 val = esp_read8(ESP_CFG1);
2230 val |= ESP_CONFIG1_SRRDISAB;
2231 esp_write8(val, ESP_CFG1);
2232
2233 scsi_esp_cmd(esp, ESP_CMD_RS);
2234 udelay(400);
2235
2236 esp_write8(esp->config1, ESP_CFG1);
2237
2238 /* Eat any bitrot in the chip and we are done... */
2239 esp_read8(ESP_INTRPT);
2240}
2241
76246808 2242static void esp_set_clock_params(struct esp *esp)
cd9ad58d 2243{
6fe07aaf 2244 int fhz;
cd9ad58d
DM		 2245 u8 ccf;
2246
2247 /* This is getting messy but it has to be done correctly or else
2248 * you get weird behavior all over the place. We are trying to
2249 * basically figure out three pieces of information.
2250 *
2251 * a) Clock Conversion Factor
2252 *
2253 * This is a representation of the input crystal clock frequency
2254 * going into the ESP on this machine. Any operation whose timing
2255 * is longer than 400ns depends on this value being correct. For
2256 * example, you'll get blips for arbitration/selection during high
2257 * load or with multiple targets if this is not set correctly.
2258 *
2259 * b) Selection Time-Out
2260 *
2261 * The ESP isn't very bright and will arbitrate for the bus and try
2262 * to select a target forever if you let it. This value tells the
2263 * ESP when it has taken too long to negotiate and that it should
2264 * interrupt the CPU so we can see what happened. The value is
2265 * computed as follows (from NCR/Symbios chip docs).
2266 *
2267 * (Time Out Period) * (Input Clock)
2268 * STO = ----------------------------------
2269 * (8192) * (Clock Conversion Factor)
2270 *
2271 * We use a time out period of 250ms (ESP_BUS_TIMEOUT).
2272 *
2273 * c) Imperical constants for synchronous offset and transfer period
2274 * register values
2275 *
2276 * This entails the smallest and largest sync period we could ever
2277 * handle on this ESP.
2278 */
6fe07aaf 2279 fhz = esp->cfreq;
cd9ad58d 2280
6fe07aaf 2281 ccf = ((fhz / 1000000) + 4) / 5;
cd9ad58d
DM		 2282 if (ccf == 1)
2283 ccf = 2;
2284
2285 /* If we can't find anything reasonable, just assume 20MHZ.
2286 * This is the clock frequency of the older sun4c's where I've
2287 * been unable to find the clock-frequency PROM property. All
2288 * other machines provide useful values it seems.
2289 */
6fe07aaf
FT		 2290 if (fhz <= 5000000 || ccf < 1 || ccf > 8) {
2291 fhz = 20000000;
cd9ad58d
DM		 2292 ccf = 4;
2293 }
2294
2295 esp->cfact = (ccf == 8 ? 0 : ccf);
6fe07aaf
FT		 2296 esp->cfreq = fhz;
2297 esp->ccycle = ESP_HZ_TO_CYCLE(fhz);
cd9ad58d 2298 esp->ctick = ESP_TICK(ccf, esp->ccycle);
6fe07aaf 2299 esp->neg_defp = ESP_NEG_DEFP(fhz, ccf);
cd9ad58d
DM		 2300 esp->sync_defp = SYNC_DEFP_SLOW;
2301}
2302
2303static const char *esp_chip_names[] = {
2304 "ESP100",
2305 "ESP100A",
2306 "ESP236",
2307 "FAS236",
2308 "FAS100A",
2309 "FAST",
2310 "FASHME",
2311};
2312
2313static struct scsi_transport_template *esp_transport_template;
2314
76246808 2315int scsi_esp_register(struct esp *esp, struct device *dev)
cd9ad58d
DM		 2316{
2317 static int instance;
2318 int err;
2319
3707a186
HR		 2320 if (!esp->num_tags)
2321 esp->num_tags = ESP_DEFAULT_TAGS;
2322 else if (esp->num_tags >= ESP_MAX_TAG)
2323 esp->num_tags = ESP_MAX_TAG - 1;
cd9ad58d
DM		 2324 esp->host->transportt = esp_transport_template;
2325 esp->host->max_lun = ESP_MAX_LUN;
2326 esp->host->cmd_per_lun = 2;
ff4abd6c 2327 esp->host->unique_id = instance;
cd9ad58d
DM		 2328
2329 esp_set_clock_params(esp);
2330
2331 esp_get_revision(esp);
2332
2333 esp_init_swstate(esp);
2334
2335 esp_bootup_reset(esp);
2336
2337 printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n",
2338 esp->host->unique_id, esp->regs, esp->dma_regs,
2339 esp->host->irq);
2340 printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n",
2341 esp->host->unique_id, esp_chip_names[esp->rev],
2342 esp->cfreq / 1000000, esp->cfact, esp->scsi_id);
2343
2344 /* Let the SCSI bus reset settle. */
2345 ssleep(esp_bus_reset_settle);
2346
2347 err = scsi_add_host(esp->host, dev);
2348 if (err)
2349 return err;
2350
ff4abd6c 2351 instance++;
cd9ad58d
DM		 2352
2353 scsi_scan_host(esp->host);
2354
2355 return 0;
2356}
2357EXPORT_SYMBOL(scsi_esp_register);
2358
76246808 2359void scsi_esp_unregister(struct esp *esp)
cd9ad58d
DM		 2360{
2361 scsi_remove_host(esp->host);
2362}
2363EXPORT_SYMBOL(scsi_esp_unregister);
2364
ec5e69f6
JB		 2365static int esp_target_alloc(struct scsi_target *starget)
2366{
2367 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2368 struct esp_target_data *tp = &esp->target[starget->id];
2369
2370 tp->starget = starget;
2371
2372 return 0;
2373}
2374
2375static void esp_target_destroy(struct scsi_target *starget)
2376{
2377 struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
2378 struct esp_target_data *tp = &esp->target[starget->id];
2379
2380 tp->starget = NULL;
2381}
2382
cd9ad58d
DM		 2383static int esp_slave_alloc(struct scsi_device *dev)
2384{
2b14ec78 2385 struct esp *esp = shost_priv(dev->host);
cd9ad58d
DM		 2386 struct esp_target_data *tp = &esp->target[dev->id];
2387 struct esp_lun_data *lp;
2388
2389 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
2390 if (!lp)
2391 return -ENOMEM;
2392 dev->hostdata = lp;
2393
cd9ad58d
DM		 2394 spi_min_period(tp->starget) = esp->min_period;
2395 spi_max_offset(tp->starget) = 15;
2396
2397 if (esp->flags & ESP_FLAG_WIDE_CAPABLE)
2398 spi_max_width(tp->starget) = 1;
2399 else
2400 spi_max_width(tp->starget) = 0;
2401
2402 return 0;
2403}
2404
2405static int esp_slave_configure(struct scsi_device *dev)
2406{
2b14ec78 2407 struct esp *esp = shost_priv(dev->host);
cd9ad58d 2408 struct esp_target_data *tp = &esp->target[dev->id];
cd9ad58d 2409
3707a186
HR		 2410 if (dev->tagged_supported)
2411 scsi_change_queue_depth(dev, esp->num_tags);
cd9ad58d 2412
cd9ad58d
DM		 2413 tp->flags |= ESP_TGT_DISCONNECT;
2414
2415 if (!spi_initial_dv(dev->sdev_target))
2416 spi_dv_device(dev);
2417
2418 return 0;
2419}
2420
2421static void esp_slave_destroy(struct scsi_device *dev)
2422{
2423 struct esp_lun_data *lp = dev->hostdata;
2424
2425 kfree(lp);
2426 dev->hostdata = NULL;
2427}
2428
2429static int esp_eh_abort_handler(struct scsi_cmnd *cmd)
2430{
2b14ec78 2431 struct esp *esp = shost_priv(cmd->device->host);
cd9ad58d
DM		 2432 struct esp_cmd_entry *ent, *tmp;
2433 struct completion eh_done;
2434 unsigned long flags;
2435
2436 /* XXX This helps a lot with debugging but might be a bit
2437 * XXX much for the final driver.
2438 */
2439 spin_lock_irqsave(esp->host->host_lock, flags);
2440 printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n",
2441 esp->host->unique_id, cmd, cmd->cmnd[0]);
2442 ent = esp->active_cmd;
2443 if (ent)
2444 printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n",
2445 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2446 list_for_each_entry(ent, &esp->queued_cmds, list) {
2447 printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n",
2448 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2449 }
2450 list_for_each_entry(ent, &esp->active_cmds, list) {
2451 printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n",
2452 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2453 }
2454 esp_dump_cmd_log(esp);
2455 spin_unlock_irqrestore(esp->host->host_lock, flags);
2456
2457 spin_lock_irqsave(esp->host->host_lock, flags);
2458
2459 ent = NULL;
2460 list_for_each_entry(tmp, &esp->queued_cmds, list) {
2461 if (tmp->cmd == cmd) {
2462 ent = tmp;
2463 break;
2464 }
2465 }
2466
2467 if (ent) {
2468 /* Easiest case, we didn't even issue the command
2469 * yet so it is trivial to abort.
2470 */
2471 list_del(&ent->list);
2472
2473 cmd->result = DID_ABORT << 16;
2474 cmd->scsi_done(cmd);
2475
2476 esp_put_ent(esp, ent);
2477
2478 goto out_success;
2479 }
2480
2481 init_completion(&eh_done);
2482
2483 ent = esp->active_cmd;
2484 if (ent && ent->cmd == cmd) {
2485 /* Command is the currently active command on
2486 * the bus. If we already have an output message
2487 * pending, no dice.
2488 */
2489 if (esp->msg_out_len)
2490 goto out_failure;
2491
2492 /* Send out an abort, encouraging the target to
2493 * go to MSGOUT phase by asserting ATN.
2494 */
2495 esp->msg_out[0] = ABORT_TASK_SET;
2496 esp->msg_out_len = 1;
2497 ent->eh_done = &eh_done;
2498
2499 scsi_esp_cmd(esp, ESP_CMD_SATN);
2500 } else {
2501 /* The command is disconnected. This is not easy to
2502 * abort. For now we fail and let the scsi error
2503 * handling layer go try a scsi bus reset or host
2504 * reset.
2505 *
2506 * What we could do is put together a scsi command
2507 * solely for the purpose of sending an abort message
2508 * to the target. Coming up with all the code to
2509 * cook up scsi commands, special case them everywhere,
2510 * etc. is for questionable gain and it would be better
2511 * if the generic scsi error handling layer could do at
2512 * least some of that for us.
2513 *
2514 * Anyways this is an area for potential future improvement
2515 * in this driver.
2516 */
2517 goto out_failure;
2518 }
2519
2520 spin_unlock_irqrestore(esp->host->host_lock, flags);
2521
2522 if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) {
2523 spin_lock_irqsave(esp->host->host_lock, flags);
2524 ent->eh_done = NULL;
2525 spin_unlock_irqrestore(esp->host->host_lock, flags);
2526
2527 return FAILED;
2528 }
2529
2530 return SUCCESS;
2531
2532out_success:
2533 spin_unlock_irqrestore(esp->host->host_lock, flags);
2534 return SUCCESS;
2535
2536out_failure:
2537 /* XXX This might be a good location to set ESP_TGT_BROKEN
2538 * XXX since we know which target/lun in particular is
2539 * XXX causing trouble.
2540 */
2541 spin_unlock_irqrestore(esp->host->host_lock, flags);
2542 return FAILED;
2543}
2544
2545static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd)
2546{
2b14ec78 2547 struct esp *esp = shost_priv(cmd->device->host);
cd9ad58d
DM		 2548 struct completion eh_reset;
2549 unsigned long flags;
2550
2551 init_completion(&eh_reset);
2552
2553 spin_lock_irqsave(esp->host->host_lock, flags);
2554
2555 esp->eh_reset = &eh_reset;
2556
2557 /* XXX This is too simple... We should add lots of
2558 * XXX checks here so that if we find that the chip is
2559 * XXX very wedged we return failure immediately so
2560 * XXX that we can perform a full chip reset.
2561 */
2562 esp->flags |= ESP_FLAG_RESETTING;
2563 scsi_esp_cmd(esp, ESP_CMD_RS);
2564
2565 spin_unlock_irqrestore(esp->host->host_lock, flags);
2566
2567 ssleep(esp_bus_reset_settle);
2568
2569 if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) {
2570 spin_lock_irqsave(esp->host->host_lock, flags);
2571 esp->eh_reset = NULL;
2572 spin_unlock_irqrestore(esp->host->host_lock, flags);
2573
2574 return FAILED;
2575 }
2576
2577 return SUCCESS;
2578}
2579
2580/* All bets are off, reset the entire device. */
2581static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd)
2582{
2b14ec78 2583 struct esp *esp = shost_priv(cmd->device->host);
cd9ad58d
DM		 2584 unsigned long flags;
2585
2586 spin_lock_irqsave(esp->host->host_lock, flags);
2587 esp_bootup_reset(esp);
2588 esp_reset_cleanup(esp);
2589 spin_unlock_irqrestore(esp->host->host_lock, flags);
2590
2591 ssleep(esp_bus_reset_settle);
2592
2593 return SUCCESS;
2594}
2595
2596static const char *esp_info(struct Scsi_Host *host)
2597{
2598 return "esp";
2599}
2600
2601struct scsi_host_template scsi_esp_template = {
2602 .module = THIS_MODULE,
2603 .name = "esp",
2604 .info = esp_info,
2605 .queuecommand = esp_queuecommand,
ec5e69f6
JB		 2606 .target_alloc = esp_target_alloc,
2607 .target_destroy = esp_target_destroy,
cd9ad58d
DM		 2608 .slave_alloc = esp_slave_alloc,
2609 .slave_configure = esp_slave_configure,
2610 .slave_destroy = esp_slave_destroy,
2611 .eh_abort_handler = esp_eh_abort_handler,
2612 .eh_bus_reset_handler = esp_eh_bus_reset_handler,
2613 .eh_host_reset_handler = esp_eh_host_reset_handler,
2614 .can_queue = 7,
2615 .this_id = 7,
2616 .sg_tablesize = SG_ALL,
2617 .use_clustering = ENABLE_CLUSTERING,
2618 .max_sectors = 0xffff,
2619 .skip_settle_delay = 1,
2ecb204d 2620 .use_blk_tags = 1,
cd9ad58d
DM		 2621};
2622EXPORT_SYMBOL(scsi_esp_template);
2623
2624static void esp_get_signalling(struct Scsi_Host *host)
2625{
2b14ec78 2626 struct esp *esp = shost_priv(host);
cd9ad58d
DM		 2627 enum spi_signal_type type;
2628
2629 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
2630 type = SPI_SIGNAL_HVD;
2631 else
2632 type = SPI_SIGNAL_SE;
2633
2634 spi_signalling(host) = type;
2635}
2636
2637static void esp_set_offset(struct scsi_target *target, int offset)
2638{
2639 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2b14ec78 2640 struct esp *esp = shost_priv(host);
cd9ad58d
DM		 2641 struct esp_target_data *tp = &esp->target[target->id];
2642
02507a80
FT		 2643 if (esp->flags & ESP_FLAG_DISABLE_SYNC)
2644 tp->nego_goal_offset = 0;
2645 else
2646 tp->nego_goal_offset = offset;
cd9ad58d
DM		 2647 tp->flags |= ESP_TGT_CHECK_NEGO;
2648}
2649
2650static void esp_set_period(struct scsi_target *target, int period)
2651{
2652 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2b14ec78 2653 struct esp *esp = shost_priv(host);
cd9ad58d
DM		 2654 struct esp_target_data *tp = &esp->target[target->id];
2655
2656 tp->nego_goal_period = period;
2657 tp->flags |= ESP_TGT_CHECK_NEGO;
2658}
2659
2660static void esp_set_width(struct scsi_target *target, int width)
2661{
2662 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2b14ec78 2663 struct esp *esp = shost_priv(host);
cd9ad58d
DM		 2664 struct esp_target_data *tp = &esp->target[target->id];
2665
2666 tp->nego_goal_width = (width ? 1 : 0);
2667 tp->flags |= ESP_TGT_CHECK_NEGO;
2668}
2669
2670static struct spi_function_template esp_transport_ops = {
2671 .set_offset = esp_set_offset,
2672 .show_offset = 1,
2673 .set_period = esp_set_period,
2674 .show_period = 1,
2675 .set_width = esp_set_width,
2676 .show_width = 1,
2677 .get_signalling = esp_get_signalling,
2678};
2679
2680static int __init esp_init(void)
2681{
2682 BUILD_BUG_ON(sizeof(struct scsi_pointer) <
2683 sizeof(struct esp_cmd_priv));
2684
2685 esp_transport_template = spi_attach_transport(&esp_transport_ops);
2686 if (!esp_transport_template)
2687 return -ENODEV;
2688
2689 return 0;
2690}
2691
2692static void __exit esp_exit(void)
2693{
2694 spi_release_transport(esp_transport_template);
2695}
2696
2697MODULE_DESCRIPTION("ESP SCSI driver core");
2698MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
2699MODULE_LICENSE("GPL");
2700MODULE_VERSION(DRV_VERSION);
2701
2702module_param(esp_bus_reset_settle, int, 0);
2703MODULE_PARM_DESC(esp_bus_reset_settle,
2704 "ESP scsi bus reset delay in seconds");
2705
2706module_param(esp_debug, int, 0);
2707MODULE_PARM_DESC(esp_debug,
2708"ESP bitmapped debugging message enable value:\n"
2709" 0x00000001 Log interrupt events\n"
2710" 0x00000002 Log scsi commands\n"
2711" 0x00000004 Log resets\n"
2712" 0x00000008 Log message in events\n"
2713" 0x00000010 Log message out events\n"
2714" 0x00000020 Log command completion\n"
2715" 0x00000040 Log disconnects\n"
2716" 0x00000080 Log data start\n"
2717" 0x00000100 Log data done\n"
2718" 0x00000200 Log reconnects\n"
2719" 0x00000400 Log auto-sense data\n"
2720);
2721
2722module_init(esp_init);
2723module_exit(esp_exit);
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