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