]>
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> | |
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. */ | |
38 | static int esp_bus_reset_settle = 3; | |
39 | ||
40 | static u32 esp_debug; | |
41 | #define ESP_DEBUG_INTR 0x00000001 | |
42 | #define ESP_DEBUG_SCSICMD 0x00000002 | |
43 | #define ESP_DEBUG_RESET 0x00000004 | |
44 | #define ESP_DEBUG_MSGIN 0x00000008 | |
45 | #define ESP_DEBUG_MSGOUT 0x00000010 | |
46 | #define ESP_DEBUG_CMDDONE 0x00000020 | |
47 | #define ESP_DEBUG_DISCONNECT 0x00000040 | |
48 | #define ESP_DEBUG_DATASTART 0x00000080 | |
49 | #define ESP_DEBUG_DATADONE 0x00000100 | |
50 | #define ESP_DEBUG_RECONNECT 0x00000200 | |
51 | #define ESP_DEBUG_AUTOSENSE 0x00000400 | |
52 | ||
53 | #define esp_log_intr(f, a...) \ | |
54 | do { if (esp_debug & ESP_DEBUG_INTR) \ | |
55 | printk(f, ## a); \ | |
56 | } while (0) | |
57 | ||
58 | #define esp_log_reset(f, a...) \ | |
59 | do { if (esp_debug & ESP_DEBUG_RESET) \ | |
60 | printk(f, ## a); \ | |
61 | } while (0) | |
62 | ||
63 | #define esp_log_msgin(f, a...) \ | |
64 | do { if (esp_debug & ESP_DEBUG_MSGIN) \ | |
65 | printk(f, ## a); \ | |
66 | } while (0) | |
67 | ||
68 | #define esp_log_msgout(f, a...) \ | |
69 | do { if (esp_debug & ESP_DEBUG_MSGOUT) \ | |
70 | printk(f, ## a); \ | |
71 | } while (0) | |
72 | ||
73 | #define esp_log_cmddone(f, a...) \ | |
74 | do { if (esp_debug & ESP_DEBUG_CMDDONE) \ | |
75 | printk(f, ## a); \ | |
76 | } while (0) | |
77 | ||
78 | #define esp_log_disconnect(f, a...) \ | |
79 | do { if (esp_debug & ESP_DEBUG_DISCONNECT) \ | |
80 | printk(f, ## a); \ | |
81 | } while (0) | |
82 | ||
83 | #define esp_log_datastart(f, a...) \ | |
84 | do { if (esp_debug & ESP_DEBUG_DATASTART) \ | |
85 | printk(f, ## a); \ | |
86 | } while (0) | |
87 | ||
88 | #define esp_log_datadone(f, a...) \ | |
89 | do { if (esp_debug & ESP_DEBUG_DATADONE) \ | |
90 | printk(f, ## a); \ | |
91 | } while (0) | |
92 | ||
93 | #define esp_log_reconnect(f, a...) \ | |
94 | do { if (esp_debug & ESP_DEBUG_RECONNECT) \ | |
95 | printk(f, ## a); \ | |
96 | } while (0) | |
97 | ||
98 | #define esp_log_autosense(f, a...) \ | |
99 | do { if (esp_debug & ESP_DEBUG_AUTOSENSE) \ | |
100 | printk(f, ## a); \ | |
101 | } while (0) | |
102 | ||
103 | #define esp_read8(REG) esp->ops->esp_read8(esp, REG) | |
104 | #define esp_write8(VAL,REG) esp->ops->esp_write8(esp, VAL, REG) | |
105 | ||
106 | static void esp_log_fill_regs(struct esp *esp, | |
107 | struct esp_event_ent *p) | |
108 | { | |
109 | p->sreg = esp->sreg; | |
110 | p->seqreg = esp->seqreg; | |
111 | p->sreg2 = esp->sreg2; | |
112 | p->ireg = esp->ireg; | |
113 | p->select_state = esp->select_state; | |
114 | p->event = esp->event; | |
115 | } | |
116 | ||
117 | void scsi_esp_cmd(struct esp *esp, u8 val) | |
118 | { | |
119 | struct esp_event_ent *p; | |
120 | int idx = esp->esp_event_cur; | |
121 | ||
122 | p = &esp->esp_event_log[idx]; | |
123 | p->type = ESP_EVENT_TYPE_CMD; | |
124 | p->val = val; | |
125 | esp_log_fill_regs(esp, p); | |
126 | ||
127 | esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1); | |
128 | ||
129 | esp_write8(val, ESP_CMD); | |
130 | } | |
131 | EXPORT_SYMBOL(scsi_esp_cmd); | |
132 | ||
133 | static void esp_event(struct esp *esp, u8 val) | |
134 | { | |
135 | struct esp_event_ent *p; | |
136 | int idx = esp->esp_event_cur; | |
137 | ||
138 | p = &esp->esp_event_log[idx]; | |
139 | p->type = ESP_EVENT_TYPE_EVENT; | |
140 | p->val = val; | |
141 | esp_log_fill_regs(esp, p); | |
142 | ||
143 | esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1); | |
144 | ||
145 | esp->event = val; | |
146 | } | |
147 | ||
148 | static void esp_dump_cmd_log(struct esp *esp) | |
149 | { | |
150 | int idx = esp->esp_event_cur; | |
151 | int stop = idx; | |
152 | ||
153 | printk(KERN_INFO PFX "esp%d: Dumping command log\n", | |
154 | esp->host->unique_id); | |
155 | do { | |
156 | struct esp_event_ent *p = &esp->esp_event_log[idx]; | |
157 | ||
158 | printk(KERN_INFO PFX "esp%d: ent[%d] %s ", | |
159 | esp->host->unique_id, idx, | |
160 | p->type == ESP_EVENT_TYPE_CMD ? "CMD" : "EVENT"); | |
161 | ||
162 | printk("val[%02x] sreg[%02x] seqreg[%02x] " | |
163 | "sreg2[%02x] ireg[%02x] ss[%02x] event[%02x]\n", | |
164 | p->val, p->sreg, p->seqreg, | |
165 | p->sreg2, p->ireg, p->select_state, p->event); | |
166 | ||
167 | idx = (idx + 1) & (ESP_EVENT_LOG_SZ - 1); | |
168 | } while (idx != stop); | |
169 | } | |
170 | ||
171 | static void esp_flush_fifo(struct esp *esp) | |
172 | { | |
173 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
174 | if (esp->rev == ESP236) { | |
175 | int lim = 1000; | |
176 | ||
177 | while (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES) { | |
178 | if (--lim == 0) { | |
179 | printk(KERN_ALERT PFX "esp%d: ESP_FF_BYTES " | |
180 | "will not clear!\n", | |
181 | esp->host->unique_id); | |
182 | break; | |
183 | } | |
184 | udelay(1); | |
185 | } | |
186 | } | |
187 | } | |
188 | ||
189 | static void hme_read_fifo(struct esp *esp) | |
190 | { | |
191 | int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
192 | int idx = 0; | |
193 | ||
194 | while (fcnt--) { | |
195 | esp->fifo[idx++] = esp_read8(ESP_FDATA); | |
196 | esp->fifo[idx++] = esp_read8(ESP_FDATA); | |
197 | } | |
198 | if (esp->sreg2 & ESP_STAT2_F1BYTE) { | |
199 | esp_write8(0, ESP_FDATA); | |
200 | esp->fifo[idx++] = esp_read8(ESP_FDATA); | |
201 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
202 | } | |
203 | esp->fifo_cnt = idx; | |
204 | } | |
205 | ||
206 | static void esp_set_all_config3(struct esp *esp, u8 val) | |
207 | { | |
208 | int i; | |
209 | ||
210 | for (i = 0; i < ESP_MAX_TARGET; i++) | |
211 | esp->target[i].esp_config3 = val; | |
212 | } | |
213 | ||
214 | /* Reset the ESP chip, _not_ the SCSI bus. */ | |
215 | static void esp_reset_esp(struct esp *esp) | |
216 | { | |
217 | u8 family_code, version; | |
218 | ||
219 | /* Now reset the ESP chip */ | |
220 | scsi_esp_cmd(esp, ESP_CMD_RC); | |
221 | scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); | |
222 | scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); | |
223 | ||
224 | /* Reload the configuration registers */ | |
225 | esp_write8(esp->cfact, ESP_CFACT); | |
226 | ||
227 | esp->prev_stp = 0; | |
228 | esp_write8(esp->prev_stp, ESP_STP); | |
229 | ||
230 | esp->prev_soff = 0; | |
231 | esp_write8(esp->prev_soff, ESP_SOFF); | |
232 | ||
233 | esp_write8(esp->neg_defp, ESP_TIMEO); | |
234 | ||
235 | /* This is the only point at which it is reliable to read | |
236 | * the ID-code for a fast ESP chip variants. | |
237 | */ | |
238 | esp->max_period = ((35 * esp->ccycle) / 1000); | |
239 | if (esp->rev == FAST) { | |
240 | version = esp_read8(ESP_UID); | |
241 | family_code = (version & 0xf8) >> 3; | |
242 | if (family_code == 0x02) | |
243 | esp->rev = FAS236; | |
244 | else if (family_code == 0x0a) | |
245 | esp->rev = FASHME; /* Version is usually '5'. */ | |
246 | else | |
247 | esp->rev = FAS100A; | |
248 | esp->min_period = ((4 * esp->ccycle) / 1000); | |
249 | } else { | |
250 | esp->min_period = ((5 * esp->ccycle) / 1000); | |
251 | } | |
252 | esp->max_period = (esp->max_period + 3)>>2; | |
253 | esp->min_period = (esp->min_period + 3)>>2; | |
254 | ||
255 | esp_write8(esp->config1, ESP_CFG1); | |
256 | switch (esp->rev) { | |
257 | case ESP100: | |
258 | /* nothing to do */ | |
259 | break; | |
260 | ||
261 | case ESP100A: | |
262 | esp_write8(esp->config2, ESP_CFG2); | |
263 | break; | |
264 | ||
265 | case ESP236: | |
266 | /* Slow 236 */ | |
267 | esp_write8(esp->config2, ESP_CFG2); | |
268 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
269 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
270 | break; | |
271 | ||
272 | case FASHME: | |
273 | esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB); | |
274 | /* fallthrough... */ | |
275 | ||
276 | case FAS236: | |
277 | /* Fast 236 or HME */ | |
278 | esp_write8(esp->config2, ESP_CFG2); | |
279 | if (esp->rev == FASHME) { | |
280 | u8 cfg3 = esp->target[0].esp_config3; | |
281 | ||
282 | cfg3 |= ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH; | |
283 | if (esp->scsi_id >= 8) | |
284 | cfg3 |= ESP_CONFIG3_IDBIT3; | |
285 | esp_set_all_config3(esp, cfg3); | |
286 | } else { | |
287 | u32 cfg3 = esp->target[0].esp_config3; | |
288 | ||
289 | cfg3 |= ESP_CONFIG3_FCLK; | |
290 | esp_set_all_config3(esp, cfg3); | |
291 | } | |
292 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
293 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
294 | if (esp->rev == FASHME) { | |
295 | esp->radelay = 80; | |
296 | } else { | |
297 | if (esp->flags & ESP_FLAG_DIFFERENTIAL) | |
298 | esp->radelay = 0; | |
299 | else | |
300 | esp->radelay = 96; | |
301 | } | |
302 | break; | |
303 | ||
304 | case FAS100A: | |
305 | /* Fast 100a */ | |
306 | esp_write8(esp->config2, ESP_CFG2); | |
307 | esp_set_all_config3(esp, | |
308 | (esp->target[0].esp_config3 | | |
309 | ESP_CONFIG3_FCLOCK)); | |
310 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
311 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
312 | esp->radelay = 32; | |
313 | break; | |
314 | ||
315 | default: | |
316 | break; | |
317 | } | |
318 | ||
319 | /* Eat any bitrot in the chip */ | |
320 | esp_read8(ESP_INTRPT); | |
321 | udelay(100); | |
322 | } | |
323 | ||
324 | static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd) | |
325 | { | |
326 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
327 | struct scatterlist *sg = cmd->request_buffer; | |
328 | int dir = cmd->sc_data_direction; | |
329 | int total, i; | |
330 | ||
331 | if (dir == DMA_NONE) | |
332 | return; | |
333 | ||
334 | BUG_ON(cmd->use_sg == 0); | |
335 | ||
336 | spriv->u.num_sg = esp->ops->map_sg(esp, sg, | |
337 | cmd->use_sg, dir); | |
338 | spriv->cur_residue = sg_dma_len(sg); | |
339 | spriv->cur_sg = sg; | |
340 | ||
341 | total = 0; | |
342 | for (i = 0; i < spriv->u.num_sg; i++) | |
343 | total += sg_dma_len(&sg[i]); | |
344 | spriv->tot_residue = total; | |
345 | } | |
346 | ||
347 | static dma_addr_t esp_cur_dma_addr(struct esp_cmd_entry *ent, | |
348 | struct scsi_cmnd *cmd) | |
349 | { | |
350 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
351 | ||
352 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
353 | return ent->sense_dma + | |
354 | (ent->sense_ptr - cmd->sense_buffer); | |
355 | } | |
356 | ||
357 | return sg_dma_address(p->cur_sg) + | |
358 | (sg_dma_len(p->cur_sg) - | |
359 | p->cur_residue); | |
360 | } | |
361 | ||
362 | static unsigned int esp_cur_dma_len(struct esp_cmd_entry *ent, | |
363 | struct scsi_cmnd *cmd) | |
364 | { | |
365 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
366 | ||
367 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
368 | return SCSI_SENSE_BUFFERSIZE - | |
369 | (ent->sense_ptr - cmd->sense_buffer); | |
370 | } | |
371 | return p->cur_residue; | |
372 | } | |
373 | ||
374 | static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent, | |
375 | struct scsi_cmnd *cmd, unsigned int len) | |
376 | { | |
377 | struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd); | |
378 | ||
379 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
380 | ent->sense_ptr += len; | |
381 | return; | |
382 | } | |
383 | ||
384 | p->cur_residue -= len; | |
385 | p->tot_residue -= len; | |
386 | if (p->cur_residue < 0 || p->tot_residue < 0) { | |
387 | printk(KERN_ERR PFX "esp%d: Data transfer overflow.\n", | |
388 | esp->host->unique_id); | |
389 | printk(KERN_ERR PFX "esp%d: cur_residue[%d] tot_residue[%d] " | |
390 | "len[%u]\n", | |
391 | esp->host->unique_id, | |
392 | p->cur_residue, p->tot_residue, len); | |
393 | p->cur_residue = 0; | |
394 | p->tot_residue = 0; | |
395 | } | |
396 | if (!p->cur_residue && p->tot_residue) { | |
397 | p->cur_sg++; | |
398 | p->cur_residue = sg_dma_len(p->cur_sg); | |
399 | } | |
400 | } | |
401 | ||
402 | static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd) | |
403 | { | |
404 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
405 | int dir = cmd->sc_data_direction; | |
406 | ||
407 | if (dir == DMA_NONE) | |
408 | return; | |
409 | ||
410 | esp->ops->unmap_sg(esp, cmd->request_buffer, | |
411 | spriv->u.num_sg, dir); | |
412 | } | |
413 | ||
414 | static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent) | |
415 | { | |
416 | struct scsi_cmnd *cmd = ent->cmd; | |
417 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
418 | ||
419 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
420 | ent->saved_sense_ptr = ent->sense_ptr; | |
421 | return; | |
422 | } | |
423 | ent->saved_cur_residue = spriv->cur_residue; | |
424 | ent->saved_cur_sg = spriv->cur_sg; | |
425 | ent->saved_tot_residue = spriv->tot_residue; | |
426 | } | |
427 | ||
428 | static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent) | |
429 | { | |
430 | struct scsi_cmnd *cmd = ent->cmd; | |
431 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
432 | ||
433 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
434 | ent->sense_ptr = ent->saved_sense_ptr; | |
435 | return; | |
436 | } | |
437 | spriv->cur_residue = ent->saved_cur_residue; | |
438 | spriv->cur_sg = ent->saved_cur_sg; | |
439 | spriv->tot_residue = ent->saved_tot_residue; | |
440 | } | |
441 | ||
442 | static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd) | |
443 | { | |
444 | if (cmd->cmd_len == 6 || | |
445 | cmd->cmd_len == 10 || | |
446 | cmd->cmd_len == 12) { | |
447 | esp->flags &= ~ESP_FLAG_DOING_SLOWCMD; | |
448 | } else { | |
449 | esp->flags |= ESP_FLAG_DOING_SLOWCMD; | |
450 | } | |
451 | } | |
452 | ||
453 | static void esp_write_tgt_config3(struct esp *esp, int tgt) | |
454 | { | |
455 | if (esp->rev > ESP100A) { | |
456 | u8 val = esp->target[tgt].esp_config3; | |
457 | ||
458 | if (val != esp->prev_cfg3) { | |
459 | esp->prev_cfg3 = val; | |
460 | esp_write8(val, ESP_CFG3); | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | static void esp_write_tgt_sync(struct esp *esp, int tgt) | |
466 | { | |
467 | u8 off = esp->target[tgt].esp_offset; | |
468 | u8 per = esp->target[tgt].esp_period; | |
469 | ||
470 | if (off != esp->prev_soff) { | |
471 | esp->prev_soff = off; | |
472 | esp_write8(off, ESP_SOFF); | |
473 | } | |
474 | if (per != esp->prev_stp) { | |
475 | esp->prev_stp = per; | |
476 | esp_write8(per, ESP_STP); | |
477 | } | |
478 | } | |
479 | ||
480 | static u32 esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len) | |
481 | { | |
482 | if (esp->rev == FASHME) { | |
483 | /* Arbitrary segment boundaries, 24-bit counts. */ | |
484 | if (dma_len > (1U << 24)) | |
485 | dma_len = (1U << 24); | |
486 | } else { | |
487 | u32 base, end; | |
488 | ||
489 | /* ESP chip limits other variants by 16-bits of transfer | |
490 | * count. Actually on FAS100A and FAS236 we could get | |
491 | * 24-bits of transfer count by enabling ESP_CONFIG2_FENAB | |
492 | * in the ESP_CFG2 register but that causes other unwanted | |
493 | * changes so we don't use it currently. | |
494 | */ | |
495 | if (dma_len > (1U << 16)) | |
496 | dma_len = (1U << 16); | |
497 | ||
498 | /* All of the DMA variants hooked up to these chips | |
499 | * cannot handle crossing a 24-bit address boundary. | |
500 | */ | |
501 | base = dma_addr & ((1U << 24) - 1U); | |
502 | end = base + dma_len; | |
503 | if (end > (1U << 24)) | |
504 | end = (1U <<24); | |
505 | dma_len = end - base; | |
506 | } | |
507 | return dma_len; | |
508 | } | |
509 | ||
510 | static int esp_need_to_nego_wide(struct esp_target_data *tp) | |
511 | { | |
512 | struct scsi_target *target = tp->starget; | |
513 | ||
514 | return spi_width(target) != tp->nego_goal_width; | |
515 | } | |
516 | ||
517 | static int esp_need_to_nego_sync(struct esp_target_data *tp) | |
518 | { | |
519 | struct scsi_target *target = tp->starget; | |
520 | ||
521 | /* When offset is zero, period is "don't care". */ | |
522 | if (!spi_offset(target) && !tp->nego_goal_offset) | |
523 | return 0; | |
524 | ||
525 | if (spi_offset(target) == tp->nego_goal_offset && | |
526 | spi_period(target) == tp->nego_goal_period) | |
527 | return 0; | |
528 | ||
529 | return 1; | |
530 | } | |
531 | ||
532 | static int esp_alloc_lun_tag(struct esp_cmd_entry *ent, | |
533 | struct esp_lun_data *lp) | |
534 | { | |
535 | if (!ent->tag[0]) { | |
536 | /* Non-tagged, slot already taken? */ | |
537 | if (lp->non_tagged_cmd) | |
538 | return -EBUSY; | |
539 | ||
540 | if (lp->hold) { | |
541 | /* We are being held by active tagged | |
542 | * commands. | |
543 | */ | |
544 | if (lp->num_tagged) | |
545 | return -EBUSY; | |
546 | ||
547 | /* Tagged commands completed, we can unplug | |
548 | * the queue and run this untagged command. | |
549 | */ | |
550 | lp->hold = 0; | |
551 | } else if (lp->num_tagged) { | |
552 | /* Plug the queue until num_tagged decreases | |
553 | * to zero in esp_free_lun_tag. | |
554 | */ | |
555 | lp->hold = 1; | |
556 | return -EBUSY; | |
557 | } | |
558 | ||
559 | lp->non_tagged_cmd = ent; | |
560 | return 0; | |
561 | } else { | |
562 | /* Tagged command, see if blocked by a | |
563 | * non-tagged one. | |
564 | */ | |
565 | if (lp->non_tagged_cmd || lp->hold) | |
566 | return -EBUSY; | |
567 | } | |
568 | ||
569 | BUG_ON(lp->tagged_cmds[ent->tag[1]]); | |
570 | ||
571 | lp->tagged_cmds[ent->tag[1]] = ent; | |
572 | lp->num_tagged++; | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static void esp_free_lun_tag(struct esp_cmd_entry *ent, | |
578 | struct esp_lun_data *lp) | |
579 | { | |
580 | if (ent->tag[0]) { | |
581 | BUG_ON(lp->tagged_cmds[ent->tag[1]] != ent); | |
582 | lp->tagged_cmds[ent->tag[1]] = NULL; | |
583 | lp->num_tagged--; | |
584 | } else { | |
585 | BUG_ON(lp->non_tagged_cmd != ent); | |
586 | lp->non_tagged_cmd = NULL; | |
587 | } | |
588 | } | |
589 | ||
590 | /* When a contingent allegiance conditon is created, we force feed a | |
591 | * REQUEST_SENSE command to the device to fetch the sense data. I | |
592 | * tried many other schemes, relying on the scsi error handling layer | |
593 | * to send out the REQUEST_SENSE automatically, but this was difficult | |
594 | * to get right especially in the presence of applications like smartd | |
595 | * which use SG_IO to send out their own REQUEST_SENSE commands. | |
596 | */ | |
597 | static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent) | |
598 | { | |
599 | struct scsi_cmnd *cmd = ent->cmd; | |
600 | struct scsi_device *dev = cmd->device; | |
601 | int tgt, lun; | |
602 | u8 *p, val; | |
603 | ||
604 | tgt = dev->id; | |
605 | lun = dev->lun; | |
606 | ||
607 | ||
608 | if (!ent->sense_ptr) { | |
609 | esp_log_autosense("esp%d: Doing auto-sense for " | |
610 | "tgt[%d] lun[%d]\n", | |
611 | esp->host->unique_id, tgt, lun); | |
612 | ||
613 | ent->sense_ptr = cmd->sense_buffer; | |
614 | ent->sense_dma = esp->ops->map_single(esp, | |
615 | ent->sense_ptr, | |
616 | SCSI_SENSE_BUFFERSIZE, | |
617 | DMA_FROM_DEVICE); | |
618 | } | |
619 | ent->saved_sense_ptr = ent->sense_ptr; | |
620 | ||
621 | esp->active_cmd = ent; | |
622 | ||
623 | p = esp->command_block; | |
624 | esp->msg_out_len = 0; | |
625 | ||
626 | *p++ = IDENTIFY(0, lun); | |
627 | *p++ = REQUEST_SENSE; | |
628 | *p++ = ((dev->scsi_level <= SCSI_2) ? | |
629 | (lun << 5) : 0); | |
630 | *p++ = 0; | |
631 | *p++ = 0; | |
632 | *p++ = SCSI_SENSE_BUFFERSIZE; | |
633 | *p++ = 0; | |
634 | ||
635 | esp->select_state = ESP_SELECT_BASIC; | |
636 | ||
637 | val = tgt; | |
638 | if (esp->rev == FASHME) | |
639 | val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT; | |
640 | esp_write8(val, ESP_BUSID); | |
641 | ||
642 | esp_write_tgt_sync(esp, tgt); | |
643 | esp_write_tgt_config3(esp, tgt); | |
644 | ||
645 | val = (p - esp->command_block); | |
646 | ||
647 | if (esp->rev == FASHME) | |
648 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
649 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
650 | val, 16, 0, ESP_CMD_DMA | ESP_CMD_SELA); | |
651 | } | |
652 | ||
653 | static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp) | |
654 | { | |
655 | struct esp_cmd_entry *ent; | |
656 | ||
657 | list_for_each_entry(ent, &esp->queued_cmds, list) { | |
658 | struct scsi_cmnd *cmd = ent->cmd; | |
659 | struct scsi_device *dev = cmd->device; | |
660 | struct esp_lun_data *lp = dev->hostdata; | |
661 | ||
662 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
663 | ent->tag[0] = 0; | |
664 | ent->tag[1] = 0; | |
665 | return ent; | |
666 | } | |
667 | ||
668 | if (!scsi_populate_tag_msg(cmd, &ent->tag[0])) { | |
669 | ent->tag[0] = 0; | |
670 | ent->tag[1] = 0; | |
671 | } | |
672 | ||
673 | if (esp_alloc_lun_tag(ent, lp) < 0) | |
674 | continue; | |
675 | ||
676 | return ent; | |
677 | } | |
678 | ||
679 | return NULL; | |
680 | } | |
681 | ||
682 | static 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 | ||
713 | list_del(&ent->list); | |
714 | list_add(&ent->list, &esp->active_cmds); | |
715 | ||
716 | esp->active_cmd = ent; | |
717 | ||
718 | esp_map_dma(esp, cmd); | |
719 | esp_save_pointers(esp, ent); | |
720 | ||
721 | esp_check_command_len(esp, cmd); | |
722 | ||
723 | p = esp->command_block; | |
724 | ||
725 | esp->msg_out_len = 0; | |
726 | if (tp->flags & ESP_TGT_CHECK_NEGO) { | |
727 | /* Need to negotiate. If the target is broken | |
728 | * go for synchronous transfers and non-wide. | |
729 | */ | |
730 | if (tp->flags & ESP_TGT_BROKEN) { | |
731 | tp->flags &= ~ESP_TGT_DISCONNECT; | |
732 | tp->nego_goal_period = 0; | |
733 | tp->nego_goal_offset = 0; | |
734 | tp->nego_goal_width = 0; | |
735 | tp->nego_goal_tags = 0; | |
736 | } | |
737 | ||
738 | /* If the settings are not changing, skip this. */ | |
739 | if (spi_width(tp->starget) == tp->nego_goal_width && | |
740 | spi_period(tp->starget) == tp->nego_goal_period && | |
741 | spi_offset(tp->starget) == tp->nego_goal_offset) { | |
742 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
743 | goto build_identify; | |
744 | } | |
745 | ||
746 | if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) { | |
747 | esp->msg_out_len = | |
748 | spi_populate_width_msg(&esp->msg_out[0], | |
749 | (tp->nego_goal_width ? | |
750 | 1 : 0)); | |
751 | tp->flags |= ESP_TGT_NEGO_WIDE; | |
752 | } else if (esp_need_to_nego_sync(tp)) { | |
753 | esp->msg_out_len = | |
754 | spi_populate_sync_msg(&esp->msg_out[0], | |
755 | tp->nego_goal_period, | |
756 | tp->nego_goal_offset); | |
757 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
758 | } else { | |
759 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
760 | } | |
761 | ||
762 | /* Process it like a slow command. */ | |
763 | if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC)) | |
764 | esp->flags |= ESP_FLAG_DOING_SLOWCMD; | |
765 | } | |
766 | ||
767 | build_identify: | |
768 | /* If we don't have a lun-data struct yet, we're probing | |
769 | * so do not disconnect. Also, do not disconnect unless | |
770 | * we have a tag on this command. | |
771 | */ | |
772 | if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0]) | |
773 | *p++ = IDENTIFY(1, lun); | |
774 | else | |
775 | *p++ = IDENTIFY(0, lun); | |
776 | ||
777 | if (ent->tag[0] && esp->rev == ESP100) { | |
778 | /* ESP100 lacks select w/atn3 command, use select | |
779 | * and stop instead. | |
780 | */ | |
781 | esp->flags |= ESP_FLAG_DOING_SLOWCMD; | |
782 | } | |
783 | ||
784 | if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) { | |
785 | start_cmd = ESP_CMD_DMA | ESP_CMD_SELA; | |
786 | if (ent->tag[0]) { | |
787 | *p++ = ent->tag[0]; | |
788 | *p++ = ent->tag[1]; | |
789 | ||
790 | start_cmd = ESP_CMD_DMA | ESP_CMD_SA3; | |
791 | } | |
792 | ||
793 | for (i = 0; i < cmd->cmd_len; i++) | |
794 | *p++ = cmd->cmnd[i]; | |
795 | ||
796 | esp->select_state = ESP_SELECT_BASIC; | |
797 | } else { | |
798 | esp->cmd_bytes_left = cmd->cmd_len; | |
799 | esp->cmd_bytes_ptr = &cmd->cmnd[0]; | |
800 | ||
801 | if (ent->tag[0]) { | |
802 | for (i = esp->msg_out_len - 1; | |
803 | i >= 0; i--) | |
804 | esp->msg_out[i + 2] = esp->msg_out[i]; | |
805 | esp->msg_out[0] = ent->tag[0]; | |
806 | esp->msg_out[1] = ent->tag[1]; | |
807 | esp->msg_out_len += 2; | |
808 | } | |
809 | ||
810 | start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS; | |
811 | esp->select_state = ESP_SELECT_MSGOUT; | |
812 | } | |
813 | val = tgt; | |
814 | if (esp->rev == FASHME) | |
815 | val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT; | |
816 | esp_write8(val, ESP_BUSID); | |
817 | ||
818 | esp_write_tgt_sync(esp, tgt); | |
819 | esp_write_tgt_config3(esp, tgt); | |
820 | ||
821 | val = (p - esp->command_block); | |
822 | ||
823 | if (esp_debug & ESP_DEBUG_SCSICMD) { | |
824 | printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun); | |
825 | for (i = 0; i < cmd->cmd_len; i++) | |
826 | printk("%02x ", cmd->cmnd[i]); | |
827 | printk("]\n"); | |
828 | } | |
829 | ||
830 | if (esp->rev == FASHME) | |
831 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
832 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
833 | val, 16, 0, start_cmd); | |
834 | } | |
835 | ||
836 | static struct esp_cmd_entry *esp_get_ent(struct esp *esp) | |
837 | { | |
838 | struct list_head *head = &esp->esp_cmd_pool; | |
839 | struct esp_cmd_entry *ret; | |
840 | ||
841 | if (list_empty(head)) { | |
842 | ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC); | |
843 | } else { | |
844 | ret = list_entry(head->next, struct esp_cmd_entry, list); | |
845 | list_del(&ret->list); | |
846 | memset(ret, 0, sizeof(*ret)); | |
847 | } | |
848 | return ret; | |
849 | } | |
850 | ||
851 | static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent) | |
852 | { | |
853 | list_add(&ent->list, &esp->esp_cmd_pool); | |
854 | } | |
855 | ||
856 | static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent, | |
857 | struct scsi_cmnd *cmd, unsigned int result) | |
858 | { | |
859 | struct scsi_device *dev = cmd->device; | |
860 | int tgt = dev->id; | |
861 | int lun = dev->lun; | |
862 | ||
863 | esp->active_cmd = NULL; | |
864 | esp_unmap_dma(esp, cmd); | |
865 | esp_free_lun_tag(ent, dev->hostdata); | |
866 | cmd->result = result; | |
867 | ||
868 | if (ent->eh_done) { | |
869 | complete(ent->eh_done); | |
870 | ent->eh_done = NULL; | |
871 | } | |
872 | ||
873 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
874 | esp->ops->unmap_single(esp, ent->sense_dma, | |
875 | SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); | |
876 | ent->sense_ptr = NULL; | |
877 | ||
878 | /* Restore the message/status bytes to what we actually | |
879 | * saw originally. Also, report that we are providing | |
880 | * the sense data. | |
881 | */ | |
882 | cmd->result = ((DRIVER_SENSE << 24) | | |
883 | (DID_OK << 16) | | |
884 | (COMMAND_COMPLETE << 8) | | |
885 | (SAM_STAT_CHECK_CONDITION << 0)); | |
886 | ||
887 | ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE; | |
888 | if (esp_debug & ESP_DEBUG_AUTOSENSE) { | |
889 | int i; | |
890 | ||
891 | printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ", | |
892 | esp->host->unique_id, tgt, lun); | |
893 | for (i = 0; i < 18; i++) | |
894 | printk("%02x ", cmd->sense_buffer[i]); | |
895 | printk("]\n"); | |
896 | } | |
897 | } | |
898 | ||
899 | cmd->scsi_done(cmd); | |
900 | ||
901 | list_del(&ent->list); | |
902 | esp_put_ent(esp, ent); | |
903 | ||
904 | esp_maybe_execute_command(esp); | |
905 | } | |
906 | ||
907 | static unsigned int compose_result(unsigned int status, unsigned int message, | |
908 | unsigned int driver_code) | |
909 | { | |
910 | return (status | (message << 8) | (driver_code << 16)); | |
911 | } | |
912 | ||
913 | static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent) | |
914 | { | |
915 | struct scsi_device *dev = ent->cmd->device; | |
916 | struct esp_lun_data *lp = dev->hostdata; | |
917 | ||
918 | scsi_track_queue_full(dev, lp->num_tagged - 1); | |
919 | } | |
920 | ||
921 | static int esp_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) | |
922 | { | |
923 | struct scsi_device *dev = cmd->device; | |
2b14ec78 | 924 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
925 | struct esp_cmd_priv *spriv; |
926 | struct esp_cmd_entry *ent; | |
927 | ||
928 | ent = esp_get_ent(esp); | |
929 | if (!ent) | |
930 | return SCSI_MLQUEUE_HOST_BUSY; | |
931 | ||
932 | ent->cmd = cmd; | |
933 | ||
934 | cmd->scsi_done = done; | |
935 | ||
936 | spriv = ESP_CMD_PRIV(cmd); | |
937 | spriv->u.dma_addr = ~(dma_addr_t)0x0; | |
938 | ||
939 | list_add_tail(&ent->list, &esp->queued_cmds); | |
940 | ||
941 | esp_maybe_execute_command(esp); | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | static int esp_check_gross_error(struct esp *esp) | |
947 | { | |
948 | if (esp->sreg & ESP_STAT_SPAM) { | |
949 | /* Gross Error, could be one of: | |
950 | * - top of fifo overwritten | |
951 | * - top of command register overwritten | |
952 | * - DMA programmed with wrong direction | |
953 | * - improper phase change | |
954 | */ | |
955 | printk(KERN_ERR PFX "esp%d: Gross error sreg[%02x]\n", | |
956 | esp->host->unique_id, esp->sreg); | |
957 | /* XXX Reset the chip. XXX */ | |
958 | return 1; | |
959 | } | |
960 | return 0; | |
961 | } | |
962 | ||
963 | static int esp_check_spur_intr(struct esp *esp) | |
964 | { | |
965 | switch (esp->rev) { | |
966 | case ESP100: | |
967 | case ESP100A: | |
968 | /* The interrupt pending bit of the status register cannot | |
969 | * be trusted on these revisions. | |
970 | */ | |
971 | esp->sreg &= ~ESP_STAT_INTR; | |
972 | break; | |
973 | ||
974 | default: | |
975 | if (!(esp->sreg & ESP_STAT_INTR)) { | |
976 | esp->ireg = esp_read8(ESP_INTRPT); | |
977 | if (esp->ireg & ESP_INTR_SR) | |
978 | return 1; | |
979 | ||
980 | /* If the DMA is indicating interrupt pending and the | |
981 | * ESP is not, the only possibility is a DMA error. | |
982 | */ | |
983 | if (!esp->ops->dma_error(esp)) { | |
984 | printk(KERN_ERR PFX "esp%d: Spurious irq, " | |
985 | "sreg=%x.\n", | |
986 | esp->host->unique_id, esp->sreg); | |
987 | return -1; | |
988 | } | |
989 | ||
990 | printk(KERN_ERR PFX "esp%d: DMA error\n", | |
991 | esp->host->unique_id); | |
992 | ||
993 | /* XXX Reset the chip. XXX */ | |
994 | return -1; | |
995 | } | |
996 | break; | |
997 | } | |
998 | ||
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | static void esp_schedule_reset(struct esp *esp) | |
1003 | { | |
1004 | esp_log_reset("ESP: esp_schedule_reset() from %p\n", | |
1005 | __builtin_return_address(0)); | |
1006 | esp->flags |= ESP_FLAG_RESETTING; | |
1007 | esp_event(esp, ESP_EVENT_RESET); | |
1008 | } | |
1009 | ||
1010 | /* In order to avoid having to add a special half-reconnected state | |
1011 | * into the driver we just sit here and poll through the rest of | |
1012 | * the reselection process to get the tag message bytes. | |
1013 | */ | |
1014 | static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp, | |
1015 | struct esp_lun_data *lp) | |
1016 | { | |
1017 | struct esp_cmd_entry *ent; | |
1018 | int i; | |
1019 | ||
1020 | if (!lp->num_tagged) { | |
1021 | printk(KERN_ERR PFX "esp%d: Reconnect w/num_tagged==0\n", | |
1022 | esp->host->unique_id); | |
1023 | return NULL; | |
1024 | } | |
1025 | ||
1026 | esp_log_reconnect("ESP: reconnect tag, "); | |
1027 | ||
1028 | for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) { | |
1029 | if (esp->ops->irq_pending(esp)) | |
1030 | break; | |
1031 | } | |
1032 | if (i == ESP_QUICKIRQ_LIMIT) { | |
1033 | printk(KERN_ERR PFX "esp%d: Reconnect IRQ1 timeout\n", | |
1034 | esp->host->unique_id); | |
1035 | return NULL; | |
1036 | } | |
1037 | ||
1038 | esp->sreg = esp_read8(ESP_STATUS); | |
1039 | esp->ireg = esp_read8(ESP_INTRPT); | |
1040 | ||
1041 | esp_log_reconnect("IRQ(%d:%x:%x), ", | |
1042 | i, esp->ireg, esp->sreg); | |
1043 | ||
1044 | if (esp->ireg & ESP_INTR_DC) { | |
1045 | printk(KERN_ERR PFX "esp%d: Reconnect, got disconnect.\n", | |
1046 | esp->host->unique_id); | |
1047 | return NULL; | |
1048 | } | |
1049 | ||
1050 | if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) { | |
1051 | printk(KERN_ERR PFX "esp%d: Reconnect, not MIP sreg[%02x].\n", | |
1052 | esp->host->unique_id, esp->sreg); | |
1053 | return NULL; | |
1054 | } | |
1055 | ||
1056 | /* DMA in the tag bytes... */ | |
1057 | esp->command_block[0] = 0xff; | |
1058 | esp->command_block[1] = 0xff; | |
1059 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
1060 | 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI); | |
1061 | ||
1062 | /* ACK the msssage. */ | |
1063 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1064 | ||
1065 | for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) { | |
1066 | if (esp->ops->irq_pending(esp)) { | |
1067 | esp->sreg = esp_read8(ESP_STATUS); | |
1068 | esp->ireg = esp_read8(ESP_INTRPT); | |
1069 | if (esp->ireg & ESP_INTR_FDONE) | |
1070 | break; | |
1071 | } | |
1072 | udelay(1); | |
1073 | } | |
1074 | if (i == ESP_RESELECT_TAG_LIMIT) { | |
1075 | printk(KERN_ERR PFX "esp%d: Reconnect IRQ2 timeout\n", | |
1076 | esp->host->unique_id); | |
1077 | return NULL; | |
1078 | } | |
1079 | esp->ops->dma_drain(esp); | |
1080 | esp->ops->dma_invalidate(esp); | |
1081 | ||
1082 | esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n", | |
1083 | i, esp->ireg, esp->sreg, | |
1084 | esp->command_block[0], | |
1085 | esp->command_block[1]); | |
1086 | ||
1087 | if (esp->command_block[0] < SIMPLE_QUEUE_TAG || | |
1088 | esp->command_block[0] > ORDERED_QUEUE_TAG) { | |
1089 | printk(KERN_ERR PFX "esp%d: Reconnect, bad tag " | |
1090 | "type %02x.\n", | |
1091 | esp->host->unique_id, esp->command_block[0]); | |
1092 | return NULL; | |
1093 | } | |
1094 | ||
1095 | ent = lp->tagged_cmds[esp->command_block[1]]; | |
1096 | if (!ent) { | |
1097 | printk(KERN_ERR PFX "esp%d: Reconnect, no entry for " | |
1098 | "tag %02x.\n", | |
1099 | esp->host->unique_id, esp->command_block[1]); | |
1100 | return NULL; | |
1101 | } | |
1102 | ||
1103 | return ent; | |
1104 | } | |
1105 | ||
1106 | static int esp_reconnect(struct esp *esp) | |
1107 | { | |
1108 | struct esp_cmd_entry *ent; | |
1109 | struct esp_target_data *tp; | |
1110 | struct esp_lun_data *lp; | |
1111 | struct scsi_device *dev; | |
1112 | int target, lun; | |
1113 | ||
1114 | BUG_ON(esp->active_cmd); | |
1115 | if (esp->rev == FASHME) { | |
1116 | /* FASHME puts the target and lun numbers directly | |
1117 | * into the fifo. | |
1118 | */ | |
1119 | target = esp->fifo[0]; | |
1120 | lun = esp->fifo[1] & 0x7; | |
1121 | } else { | |
1122 | u8 bits = esp_read8(ESP_FDATA); | |
1123 | ||
1124 | /* Older chips put the lun directly into the fifo, but | |
1125 | * the target is given as a sample of the arbitration | |
1126 | * lines on the bus at reselection time. So we should | |
1127 | * see the ID of the ESP and the one reconnecting target | |
1128 | * set in the bitmap. | |
1129 | */ | |
1130 | if (!(bits & esp->scsi_id_mask)) | |
1131 | goto do_reset; | |
1132 | bits &= ~esp->scsi_id_mask; | |
1133 | if (!bits || (bits & (bits - 1))) | |
1134 | goto do_reset; | |
1135 | ||
1136 | target = ffs(bits) - 1; | |
1137 | lun = (esp_read8(ESP_FDATA) & 0x7); | |
1138 | ||
1139 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1140 | if (esp->rev == ESP100) { | |
1141 | u8 ireg = esp_read8(ESP_INTRPT); | |
1142 | /* This chip has a bug during reselection that can | |
1143 | * cause a spurious illegal-command interrupt, which | |
1144 | * we simply ACK here. Another possibility is a bus | |
1145 | * reset so we must check for that. | |
1146 | */ | |
1147 | if (ireg & ESP_INTR_SR) | |
1148 | goto do_reset; | |
1149 | } | |
1150 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1151 | } | |
1152 | ||
1153 | esp_write_tgt_sync(esp, target); | |
1154 | esp_write_tgt_config3(esp, target); | |
1155 | ||
1156 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1157 | ||
1158 | if (esp->rev == FASHME) | |
1159 | esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT, | |
1160 | ESP_BUSID); | |
1161 | ||
1162 | tp = &esp->target[target]; | |
1163 | dev = __scsi_device_lookup_by_target(tp->starget, lun); | |
1164 | if (!dev) { | |
1165 | printk(KERN_ERR PFX "esp%d: Reconnect, no lp " | |
1166 | "tgt[%u] lun[%u]\n", | |
1167 | esp->host->unique_id, target, lun); | |
1168 | goto do_reset; | |
1169 | } | |
1170 | lp = dev->hostdata; | |
1171 | ||
1172 | ent = lp->non_tagged_cmd; | |
1173 | if (!ent) { | |
1174 | ent = esp_reconnect_with_tag(esp, lp); | |
1175 | if (!ent) | |
1176 | goto do_reset; | |
1177 | } | |
1178 | ||
1179 | esp->active_cmd = ent; | |
1180 | ||
1181 | if (ent->flags & ESP_CMD_FLAG_ABORT) { | |
1182 | esp->msg_out[0] = ABORT_TASK_SET; | |
1183 | esp->msg_out_len = 1; | |
1184 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1185 | } | |
1186 | ||
1187 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1188 | esp_restore_pointers(esp, ent); | |
1189 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1190 | return 1; | |
1191 | ||
1192 | do_reset: | |
1193 | esp_schedule_reset(esp); | |
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | static int esp_finish_select(struct esp *esp) | |
1198 | { | |
1199 | struct esp_cmd_entry *ent; | |
1200 | struct scsi_cmnd *cmd; | |
1201 | u8 orig_select_state; | |
1202 | ||
1203 | orig_select_state = esp->select_state; | |
1204 | ||
1205 | /* No longer selecting. */ | |
1206 | esp->select_state = ESP_SELECT_NONE; | |
1207 | ||
1208 | esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS; | |
1209 | ent = esp->active_cmd; | |
1210 | cmd = ent->cmd; | |
1211 | ||
1212 | if (esp->ops->dma_error(esp)) { | |
1213 | /* If we see a DMA error during or as a result of selection, | |
1214 | * all bets are off. | |
1215 | */ | |
1216 | esp_schedule_reset(esp); | |
1217 | esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16)); | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | esp->ops->dma_invalidate(esp); | |
1222 | ||
1223 | if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { | |
1224 | struct esp_target_data *tp = &esp->target[cmd->device->id]; | |
1225 | ||
1226 | /* Carefully back out of the selection attempt. Release | |
1227 | * resources (such as DMA mapping & TAG) and reset state (such | |
1228 | * as message out and command delivery variables). | |
1229 | */ | |
1230 | if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) { | |
1231 | esp_unmap_dma(esp, cmd); | |
1232 | esp_free_lun_tag(ent, cmd->device->hostdata); | |
1233 | tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE); | |
1234 | esp->flags &= ~ESP_FLAG_DOING_SLOWCMD; | |
1235 | esp->cmd_bytes_ptr = NULL; | |
1236 | esp->cmd_bytes_left = 0; | |
1237 | } else { | |
1238 | esp->ops->unmap_single(esp, ent->sense_dma, | |
1239 | SCSI_SENSE_BUFFERSIZE, | |
1240 | DMA_FROM_DEVICE); | |
1241 | ent->sense_ptr = NULL; | |
1242 | } | |
1243 | ||
1244 | /* Now that the state is unwound properly, put back onto | |
1245 | * the issue queue. This command is no longer active. | |
1246 | */ | |
1247 | list_del(&ent->list); | |
1248 | list_add(&ent->list, &esp->queued_cmds); | |
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 | ||
1300 | static 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 | ||
1362 | static 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 | ||
1401 | static 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 | ||
1442 | static 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) { | |
1455 | int rounded_up, one_clock; | |
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; | |
1465 | rounded_up = (period << 2); | |
1466 | rounded_up = (rounded_up + one_clock - 1) / one_clock; | |
1467 | stp = rounded_up; | |
1468 | if (stp && esp->rev >= FAS236) { | |
1469 | if (stp >= 50) | |
1470 | stp--; | |
1471 | } | |
1472 | } else { | |
1473 | stp = 0; | |
1474 | } | |
1475 | ||
1476 | esp_setsync(esp, tp, period, offset, stp, offset); | |
1477 | return; | |
1478 | ||
1479 | do_reject: | |
1480 | esp->msg_out[0] = MESSAGE_REJECT; | |
1481 | esp->msg_out_len = 1; | |
1482 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1483 | return; | |
1484 | ||
1485 | do_sdtr: | |
1486 | tp->nego_goal_period = period; | |
1487 | tp->nego_goal_offset = offset; | |
1488 | esp->msg_out_len = | |
1489 | spi_populate_sync_msg(&esp->msg_out[0], | |
1490 | tp->nego_goal_period, | |
1491 | tp->nego_goal_offset); | |
1492 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1493 | } | |
1494 | ||
1495 | static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp) | |
1496 | { | |
1497 | int size = 8 << esp->msg_in[3]; | |
1498 | u8 cfg3; | |
1499 | ||
1500 | if (esp->rev != FASHME) | |
1501 | goto do_reject; | |
1502 | ||
1503 | if (size != 8 && size != 16) | |
1504 | goto do_reject; | |
1505 | ||
1506 | if (!(tp->flags & ESP_TGT_NEGO_WIDE)) | |
1507 | goto do_reject; | |
1508 | ||
1509 | cfg3 = tp->esp_config3; | |
1510 | if (size == 16) { | |
1511 | tp->flags |= ESP_TGT_WIDE; | |
1512 | cfg3 |= ESP_CONFIG3_EWIDE; | |
1513 | } else { | |
1514 | tp->flags &= ~ESP_TGT_WIDE; | |
1515 | cfg3 &= ~ESP_CONFIG3_EWIDE; | |
1516 | } | |
1517 | tp->esp_config3 = cfg3; | |
1518 | esp->prev_cfg3 = cfg3; | |
1519 | esp_write8(cfg3, ESP_CFG3); | |
1520 | ||
1521 | tp->flags &= ~ESP_TGT_NEGO_WIDE; | |
1522 | ||
1523 | spi_period(tp->starget) = 0; | |
1524 | spi_offset(tp->starget) = 0; | |
1525 | if (!esp_need_to_nego_sync(tp)) { | |
1526 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
1527 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1528 | } else { | |
1529 | esp->msg_out_len = | |
1530 | spi_populate_sync_msg(&esp->msg_out[0], | |
1531 | tp->nego_goal_period, | |
1532 | tp->nego_goal_offset); | |
1533 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
1534 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1535 | } | |
1536 | return; | |
1537 | ||
1538 | do_reject: | |
1539 | esp->msg_out[0] = MESSAGE_REJECT; | |
1540 | esp->msg_out_len = 1; | |
1541 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1542 | } | |
1543 | ||
1544 | static void esp_msgin_extended(struct esp *esp) | |
1545 | { | |
1546 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1547 | struct scsi_cmnd *cmd = ent->cmd; | |
1548 | struct esp_target_data *tp; | |
1549 | int tgt = cmd->device->id; | |
1550 | ||
1551 | tp = &esp->target[tgt]; | |
1552 | if (esp->msg_in[2] == EXTENDED_SDTR) { | |
1553 | esp_msgin_sdtr(esp, tp); | |
1554 | return; | |
1555 | } | |
1556 | if (esp->msg_in[2] == EXTENDED_WDTR) { | |
1557 | esp_msgin_wdtr(esp, tp); | |
1558 | return; | |
1559 | } | |
1560 | ||
1561 | printk("ESP: Unexpected extended msg type %x\n", | |
1562 | esp->msg_in[2]); | |
1563 | ||
1564 | esp->msg_out[0] = ABORT_TASK_SET; | |
1565 | esp->msg_out_len = 1; | |
1566 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1567 | } | |
1568 | ||
1569 | /* Analyze msgin bytes received from target so far. Return non-zero | |
1570 | * if there are more bytes needed to complete the message. | |
1571 | */ | |
1572 | static int esp_msgin_process(struct esp *esp) | |
1573 | { | |
1574 | u8 msg0 = esp->msg_in[0]; | |
1575 | int len = esp->msg_in_len; | |
1576 | ||
1577 | if (msg0 & 0x80) { | |
1578 | /* Identify */ | |
1579 | printk("ESP: Unexpected msgin identify\n"); | |
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | switch (msg0) { | |
1584 | case EXTENDED_MESSAGE: | |
1585 | if (len == 1) | |
1586 | return 1; | |
1587 | if (len < esp->msg_in[1] + 2) | |
1588 | return 1; | |
1589 | esp_msgin_extended(esp); | |
1590 | return 0; | |
1591 | ||
1592 | case IGNORE_WIDE_RESIDUE: { | |
1593 | struct esp_cmd_entry *ent; | |
1594 | struct esp_cmd_priv *spriv; | |
1595 | if (len == 1) | |
1596 | return 1; | |
1597 | ||
1598 | if (esp->msg_in[1] != 1) | |
1599 | goto do_reject; | |
1600 | ||
1601 | ent = esp->active_cmd; | |
1602 | spriv = ESP_CMD_PRIV(ent->cmd); | |
1603 | ||
1604 | if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) { | |
1605 | spriv->cur_sg--; | |
1606 | spriv->cur_residue = 1; | |
1607 | } else | |
1608 | spriv->cur_residue++; | |
1609 | spriv->tot_residue++; | |
1610 | return 0; | |
1611 | } | |
1612 | case NOP: | |
1613 | return 0; | |
1614 | case RESTORE_POINTERS: | |
1615 | esp_restore_pointers(esp, esp->active_cmd); | |
1616 | return 0; | |
1617 | case SAVE_POINTERS: | |
1618 | esp_save_pointers(esp, esp->active_cmd); | |
1619 | return 0; | |
1620 | ||
1621 | case COMMAND_COMPLETE: | |
1622 | case DISCONNECT: { | |
1623 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1624 | ||
1625 | ent->message = msg0; | |
1626 | esp_event(esp, ESP_EVENT_FREE_BUS); | |
1627 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1628 | return 0; | |
1629 | } | |
1630 | case MESSAGE_REJECT: | |
1631 | esp_msgin_reject(esp); | |
1632 | return 0; | |
1633 | ||
1634 | default: | |
1635 | do_reject: | |
1636 | esp->msg_out[0] = MESSAGE_REJECT; | |
1637 | esp->msg_out_len = 1; | |
1638 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1639 | return 0; | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | static int esp_process_event(struct esp *esp) | |
1644 | { | |
1645 | int write; | |
1646 | ||
1647 | again: | |
1648 | write = 0; | |
1649 | switch (esp->event) { | |
1650 | case ESP_EVENT_CHECK_PHASE: | |
1651 | switch (esp->sreg & ESP_STAT_PMASK) { | |
1652 | case ESP_DOP: | |
1653 | esp_event(esp, ESP_EVENT_DATA_OUT); | |
1654 | break; | |
1655 | case ESP_DIP: | |
1656 | esp_event(esp, ESP_EVENT_DATA_IN); | |
1657 | break; | |
1658 | case ESP_STATP: | |
1659 | esp_flush_fifo(esp); | |
1660 | scsi_esp_cmd(esp, ESP_CMD_ICCSEQ); | |
1661 | esp_event(esp, ESP_EVENT_STATUS); | |
1662 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1663 | return 1; | |
1664 | ||
1665 | case ESP_MOP: | |
1666 | esp_event(esp, ESP_EVENT_MSGOUT); | |
1667 | break; | |
1668 | ||
1669 | case ESP_MIP: | |
1670 | esp_event(esp, ESP_EVENT_MSGIN); | |
1671 | break; | |
1672 | ||
1673 | case ESP_CMDP: | |
1674 | esp_event(esp, ESP_EVENT_CMD_START); | |
1675 | break; | |
1676 | ||
1677 | default: | |
1678 | printk("ESP: Unexpected phase, sreg=%02x\n", | |
1679 | esp->sreg); | |
1680 | esp_schedule_reset(esp); | |
1681 | return 0; | |
1682 | } | |
1683 | goto again; | |
1684 | break; | |
1685 | ||
1686 | case ESP_EVENT_DATA_IN: | |
1687 | write = 1; | |
1688 | /* fallthru */ | |
1689 | ||
1690 | case ESP_EVENT_DATA_OUT: { | |
1691 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1692 | struct scsi_cmnd *cmd = ent->cmd; | |
1693 | dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd); | |
1694 | unsigned int dma_len = esp_cur_dma_len(ent, cmd); | |
1695 | ||
1696 | if (esp->rev == ESP100) | |
1697 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1698 | ||
1699 | if (write) | |
1700 | ent->flags |= ESP_CMD_FLAG_WRITE; | |
1701 | else | |
1702 | ent->flags &= ~ESP_CMD_FLAG_WRITE; | |
1703 | ||
1704 | dma_len = esp_dma_length_limit(esp, dma_addr, dma_len); | |
1705 | esp->data_dma_len = dma_len; | |
1706 | ||
1707 | if (!dma_len) { | |
1708 | printk(KERN_ERR PFX "esp%d: DMA length is zero!\n", | |
1709 | esp->host->unique_id); | |
e1f2a094 | 1710 | printk(KERN_ERR PFX "esp%d: cur adr[%08llx] len[%08x]\n", |
cd9ad58d | 1711 | esp->host->unique_id, |
e1f2a094 | 1712 | (unsigned long long)esp_cur_dma_addr(ent, cmd), |
cd9ad58d DM |
1713 | esp_cur_dma_len(ent, cmd)); |
1714 | esp_schedule_reset(esp); | |
1715 | return 0; | |
1716 | } | |
1717 | ||
e1f2a094 | 1718 | esp_log_datastart("ESP: start data addr[%08llx] len[%u] " |
cd9ad58d | 1719 | "write(%d)\n", |
e1f2a094 | 1720 | (unsigned long long)dma_addr, dma_len, write); |
cd9ad58d DM |
1721 | |
1722 | esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len, | |
1723 | write, ESP_CMD_DMA | ESP_CMD_TI); | |
1724 | esp_event(esp, ESP_EVENT_DATA_DONE); | |
1725 | break; | |
1726 | } | |
1727 | case ESP_EVENT_DATA_DONE: { | |
1728 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1729 | struct scsi_cmnd *cmd = ent->cmd; | |
1730 | int bytes_sent; | |
1731 | ||
1732 | if (esp->ops->dma_error(esp)) { | |
1733 | printk("ESP: data done, DMA error, resetting\n"); | |
1734 | esp_schedule_reset(esp); | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | if (ent->flags & ESP_CMD_FLAG_WRITE) { | |
1739 | /* XXX parity errors, etc. XXX */ | |
1740 | ||
1741 | esp->ops->dma_drain(esp); | |
1742 | } | |
1743 | esp->ops->dma_invalidate(esp); | |
1744 | ||
1745 | if (esp->ireg != ESP_INTR_BSERV) { | |
1746 | /* We should always see exactly a bus-service | |
1747 | * interrupt at the end of a successful transfer. | |
1748 | */ | |
1749 | printk("ESP: data done, not BSERV, resetting\n"); | |
1750 | esp_schedule_reset(esp); | |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | bytes_sent = esp_data_bytes_sent(esp, ent, cmd); | |
1755 | ||
1756 | esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n", | |
1757 | ent->flags, bytes_sent); | |
1758 | ||
1759 | if (bytes_sent < 0) { | |
1760 | /* XXX force sync mode for this target XXX */ | |
1761 | esp_schedule_reset(esp); | |
1762 | return 0; | |
1763 | } | |
1764 | ||
1765 | esp_advance_dma(esp, ent, cmd, bytes_sent); | |
1766 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1767 | goto again; | |
1768 | break; | |
1769 | } | |
1770 | ||
1771 | case ESP_EVENT_STATUS: { | |
1772 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1773 | ||
1774 | if (esp->ireg & ESP_INTR_FDONE) { | |
1775 | ent->status = esp_read8(ESP_FDATA); | |
1776 | ent->message = esp_read8(ESP_FDATA); | |
1777 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1778 | } else if (esp->ireg == ESP_INTR_BSERV) { | |
1779 | ent->status = esp_read8(ESP_FDATA); | |
1780 | ent->message = 0xff; | |
1781 | esp_event(esp, ESP_EVENT_MSGIN); | |
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | if (ent->message != COMMAND_COMPLETE) { | |
1786 | printk("ESP: Unexpected message %x in status\n", | |
1787 | ent->message); | |
1788 | esp_schedule_reset(esp); | |
1789 | return 0; | |
1790 | } | |
1791 | ||
1792 | esp_event(esp, ESP_EVENT_FREE_BUS); | |
1793 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1794 | break; | |
1795 | } | |
1796 | case ESP_EVENT_FREE_BUS: { | |
1797 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1798 | struct scsi_cmnd *cmd = ent->cmd; | |
1799 | ||
1800 | if (ent->message == COMMAND_COMPLETE || | |
1801 | ent->message == DISCONNECT) | |
1802 | scsi_esp_cmd(esp, ESP_CMD_ESEL); | |
1803 | ||
1804 | if (ent->message == COMMAND_COMPLETE) { | |
1805 | esp_log_cmddone("ESP: Command done status[%x] " | |
1806 | "message[%x]\n", | |
1807 | ent->status, ent->message); | |
1808 | if (ent->status == SAM_STAT_TASK_SET_FULL) | |
1809 | esp_event_queue_full(esp, ent); | |
1810 | ||
1811 | if (ent->status == SAM_STAT_CHECK_CONDITION && | |
1812 | !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) { | |
1813 | ent->flags |= ESP_CMD_FLAG_AUTOSENSE; | |
1814 | esp_autosense(esp, ent); | |
1815 | } else { | |
1816 | esp_cmd_is_done(esp, ent, cmd, | |
1817 | compose_result(ent->status, | |
1818 | ent->message, | |
1819 | DID_OK)); | |
1820 | } | |
1821 | } else if (ent->message == DISCONNECT) { | |
1822 | esp_log_disconnect("ESP: Disconnecting tgt[%d] " | |
1823 | "tag[%x:%x]\n", | |
1824 | cmd->device->id, | |
1825 | ent->tag[0], ent->tag[1]); | |
1826 | ||
1827 | esp->active_cmd = NULL; | |
1828 | esp_maybe_execute_command(esp); | |
1829 | } else { | |
1830 | printk("ESP: Unexpected message %x in freebus\n", | |
1831 | ent->message); | |
1832 | esp_schedule_reset(esp); | |
1833 | return 0; | |
1834 | } | |
1835 | if (esp->active_cmd) | |
1836 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1837 | break; | |
1838 | } | |
1839 | case ESP_EVENT_MSGOUT: { | |
1840 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1841 | ||
1842 | if (esp_debug & ESP_DEBUG_MSGOUT) { | |
1843 | int i; | |
1844 | printk("ESP: Sending message [ "); | |
1845 | for (i = 0; i < esp->msg_out_len; i++) | |
1846 | printk("%02x ", esp->msg_out[i]); | |
1847 | printk("]\n"); | |
1848 | } | |
1849 | ||
1850 | if (esp->rev == FASHME) { | |
1851 | int i; | |
1852 | ||
1853 | /* Always use the fifo. */ | |
1854 | for (i = 0; i < esp->msg_out_len; i++) { | |
1855 | esp_write8(esp->msg_out[i], ESP_FDATA); | |
1856 | esp_write8(0, ESP_FDATA); | |
1857 | } | |
1858 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
1859 | } else { | |
1860 | if (esp->msg_out_len == 1) { | |
1861 | esp_write8(esp->msg_out[0], ESP_FDATA); | |
1862 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
1863 | } else { | |
1864 | /* Use DMA. */ | |
1865 | memcpy(esp->command_block, | |
1866 | esp->msg_out, | |
1867 | esp->msg_out_len); | |
1868 | ||
1869 | esp->ops->send_dma_cmd(esp, | |
1870 | esp->command_block_dma, | |
1871 | esp->msg_out_len, | |
1872 | esp->msg_out_len, | |
1873 | 0, | |
1874 | ESP_CMD_DMA|ESP_CMD_TI); | |
1875 | } | |
1876 | } | |
1877 | esp_event(esp, ESP_EVENT_MSGOUT_DONE); | |
1878 | break; | |
1879 | } | |
1880 | case ESP_EVENT_MSGOUT_DONE: | |
1881 | if (esp->rev == FASHME) { | |
1882 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1883 | } else { | |
1884 | if (esp->msg_out_len > 1) | |
1885 | esp->ops->dma_invalidate(esp); | |
1886 | } | |
1887 | ||
1888 | if (!(esp->ireg & ESP_INTR_DC)) { | |
1889 | if (esp->rev != FASHME) | |
1890 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1891 | } | |
1892 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1893 | goto again; | |
1894 | case ESP_EVENT_MSGIN: | |
1895 | if (esp->ireg & ESP_INTR_BSERV) { | |
1896 | if (esp->rev == FASHME) { | |
1897 | if (!(esp_read8(ESP_STATUS2) & | |
1898 | ESP_STAT2_FEMPTY)) | |
1899 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1900 | } else { | |
1901 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1902 | if (esp->rev == ESP100) | |
1903 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1904 | } | |
1905 | scsi_esp_cmd(esp, ESP_CMD_TI); | |
1906 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1907 | return 1; | |
1908 | } | |
1909 | if (esp->ireg & ESP_INTR_FDONE) { | |
1910 | u8 val; | |
1911 | ||
1912 | if (esp->rev == FASHME) | |
1913 | val = esp->fifo[0]; | |
1914 | else | |
1915 | val = esp_read8(ESP_FDATA); | |
1916 | esp->msg_in[esp->msg_in_len++] = val; | |
1917 | ||
1918 | esp_log_msgin("ESP: Got msgin byte %x\n", val); | |
1919 | ||
1920 | if (!esp_msgin_process(esp)) | |
1921 | esp->msg_in_len = 0; | |
1922 | ||
1923 | if (esp->rev == FASHME) | |
1924 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1925 | ||
1926 | scsi_esp_cmd(esp, ESP_CMD_MOK); | |
1927 | ||
1928 | if (esp->event != ESP_EVENT_FREE_BUS) | |
1929 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1930 | } else { | |
1931 | printk("ESP: MSGIN neither BSERV not FDON, resetting"); | |
1932 | esp_schedule_reset(esp); | |
1933 | return 0; | |
1934 | } | |
1935 | break; | |
1936 | case ESP_EVENT_CMD_START: | |
1937 | memcpy(esp->command_block, esp->cmd_bytes_ptr, | |
1938 | esp->cmd_bytes_left); | |
1939 | if (esp->rev == FASHME) | |
1940 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
1941 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
1942 | esp->cmd_bytes_left, 16, 0, | |
1943 | ESP_CMD_DMA | ESP_CMD_TI); | |
1944 | esp_event(esp, ESP_EVENT_CMD_DONE); | |
1945 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1946 | break; | |
1947 | case ESP_EVENT_CMD_DONE: | |
1948 | esp->ops->dma_invalidate(esp); | |
1949 | if (esp->ireg & ESP_INTR_BSERV) { | |
1950 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1951 | goto again; | |
1952 | } | |
1953 | esp_schedule_reset(esp); | |
1954 | return 0; | |
1955 | break; | |
1956 | ||
1957 | case ESP_EVENT_RESET: | |
1958 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
1959 | break; | |
1960 | ||
1961 | default: | |
1962 | printk("ESP: Unexpected event %x, resetting\n", | |
1963 | esp->event); | |
1964 | esp_schedule_reset(esp); | |
1965 | return 0; | |
1966 | break; | |
1967 | } | |
1968 | return 1; | |
1969 | } | |
1970 | ||
1971 | static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent) | |
1972 | { | |
1973 | struct scsi_cmnd *cmd = ent->cmd; | |
1974 | ||
1975 | esp_unmap_dma(esp, cmd); | |
1976 | esp_free_lun_tag(ent, cmd->device->hostdata); | |
1977 | cmd->result = DID_RESET << 16; | |
1978 | ||
1979 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
1980 | esp->ops->unmap_single(esp, ent->sense_dma, | |
1981 | SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); | |
1982 | ent->sense_ptr = NULL; | |
1983 | } | |
1984 | ||
1985 | cmd->scsi_done(cmd); | |
1986 | list_del(&ent->list); | |
1987 | esp_put_ent(esp, ent); | |
1988 | } | |
1989 | ||
1990 | static void esp_clear_hold(struct scsi_device *dev, void *data) | |
1991 | { | |
1992 | struct esp_lun_data *lp = dev->hostdata; | |
1993 | ||
1994 | BUG_ON(lp->num_tagged); | |
1995 | lp->hold = 0; | |
1996 | } | |
1997 | ||
1998 | static void esp_reset_cleanup(struct esp *esp) | |
1999 | { | |
2000 | struct esp_cmd_entry *ent, *tmp; | |
2001 | int i; | |
2002 | ||
2003 | list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) { | |
2004 | struct scsi_cmnd *cmd = ent->cmd; | |
2005 | ||
2006 | list_del(&ent->list); | |
2007 | cmd->result = DID_RESET << 16; | |
2008 | cmd->scsi_done(cmd); | |
2009 | esp_put_ent(esp, ent); | |
2010 | } | |
2011 | ||
2012 | list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) { | |
2013 | if (ent == esp->active_cmd) | |
2014 | esp->active_cmd = NULL; | |
2015 | esp_reset_cleanup_one(esp, ent); | |
2016 | } | |
2017 | ||
2018 | BUG_ON(esp->active_cmd != NULL); | |
2019 | ||
2020 | /* Force renegotiation of sync/wide transfers. */ | |
2021 | for (i = 0; i < ESP_MAX_TARGET; i++) { | |
2022 | struct esp_target_data *tp = &esp->target[i]; | |
2023 | ||
2024 | tp->esp_period = 0; | |
2025 | tp->esp_offset = 0; | |
2026 | tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE | | |
2027 | ESP_CONFIG3_FSCSI | | |
2028 | ESP_CONFIG3_FAST); | |
2029 | tp->flags &= ~ESP_TGT_WIDE; | |
2030 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2031 | ||
2032 | if (tp->starget) | |
2033 | starget_for_each_device(tp->starget, NULL, | |
2034 | esp_clear_hold); | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | /* Runs under host->lock */ | |
2039 | static void __esp_interrupt(struct esp *esp) | |
2040 | { | |
2041 | int finish_reset, intr_done; | |
2042 | u8 phase; | |
2043 | ||
2044 | esp->sreg = esp_read8(ESP_STATUS); | |
2045 | ||
2046 | if (esp->flags & ESP_FLAG_RESETTING) { | |
2047 | finish_reset = 1; | |
2048 | } else { | |
2049 | if (esp_check_gross_error(esp)) | |
2050 | return; | |
2051 | ||
2052 | finish_reset = esp_check_spur_intr(esp); | |
2053 | if (finish_reset < 0) | |
2054 | return; | |
2055 | } | |
2056 | ||
2057 | esp->ireg = esp_read8(ESP_INTRPT); | |
2058 | ||
2059 | if (esp->ireg & ESP_INTR_SR) | |
2060 | finish_reset = 1; | |
2061 | ||
2062 | if (finish_reset) { | |
2063 | esp_reset_cleanup(esp); | |
2064 | if (esp->eh_reset) { | |
2065 | complete(esp->eh_reset); | |
2066 | esp->eh_reset = NULL; | |
2067 | } | |
2068 | return; | |
2069 | } | |
2070 | ||
2071 | phase = (esp->sreg & ESP_STAT_PMASK); | |
2072 | if (esp->rev == FASHME) { | |
2073 | if (((phase != ESP_DIP && phase != ESP_DOP) && | |
2074 | esp->select_state == ESP_SELECT_NONE && | |
2075 | esp->event != ESP_EVENT_STATUS && | |
2076 | esp->event != ESP_EVENT_DATA_DONE) || | |
2077 | (esp->ireg & ESP_INTR_RSEL)) { | |
2078 | esp->sreg2 = esp_read8(ESP_STATUS2); | |
2079 | if (!(esp->sreg2 & ESP_STAT2_FEMPTY) || | |
2080 | (esp->sreg2 & ESP_STAT2_F1BYTE)) | |
2081 | hme_read_fifo(esp); | |
2082 | } | |
2083 | } | |
2084 | ||
2085 | esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] " | |
2086 | "sreg2[%02x] ireg[%02x]\n", | |
2087 | esp->sreg, esp->seqreg, esp->sreg2, esp->ireg); | |
2088 | ||
2089 | intr_done = 0; | |
2090 | ||
2091 | if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) { | |
2092 | printk("ESP: unexpected IREG %02x\n", esp->ireg); | |
2093 | if (esp->ireg & ESP_INTR_IC) | |
2094 | esp_dump_cmd_log(esp); | |
2095 | ||
2096 | esp_schedule_reset(esp); | |
2097 | } else { | |
2098 | if (!(esp->ireg & ESP_INTR_RSEL)) { | |
2099 | /* Some combination of FDONE, BSERV, DC. */ | |
2100 | if (esp->select_state != ESP_SELECT_NONE) | |
2101 | intr_done = esp_finish_select(esp); | |
2102 | } else if (esp->ireg & ESP_INTR_RSEL) { | |
2103 | if (esp->active_cmd) | |
2104 | (void) esp_finish_select(esp); | |
2105 | intr_done = esp_reconnect(esp); | |
2106 | } | |
2107 | } | |
2108 | while (!intr_done) | |
2109 | intr_done = esp_process_event(esp); | |
2110 | } | |
2111 | ||
2112 | irqreturn_t scsi_esp_intr(int irq, void *dev_id) | |
2113 | { | |
2114 | struct esp *esp = dev_id; | |
2115 | unsigned long flags; | |
2116 | irqreturn_t ret; | |
2117 | ||
2118 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2119 | ret = IRQ_NONE; | |
2120 | if (esp->ops->irq_pending(esp)) { | |
2121 | ret = IRQ_HANDLED; | |
2122 | for (;;) { | |
2123 | int i; | |
2124 | ||
2125 | __esp_interrupt(esp); | |
2126 | if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK)) | |
2127 | break; | |
2128 | esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK; | |
2129 | ||
2130 | for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) { | |
2131 | if (esp->ops->irq_pending(esp)) | |
2132 | break; | |
2133 | } | |
2134 | if (i == ESP_QUICKIRQ_LIMIT) | |
2135 | break; | |
2136 | } | |
2137 | } | |
2138 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2139 | ||
2140 | return ret; | |
2141 | } | |
2142 | EXPORT_SYMBOL(scsi_esp_intr); | |
2143 | ||
2144 | static void __devinit esp_get_revision(struct esp *esp) | |
2145 | { | |
2146 | u8 val; | |
2147 | ||
2148 | esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); | |
2149 | esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); | |
2150 | esp_write8(esp->config2, ESP_CFG2); | |
2151 | ||
2152 | val = esp_read8(ESP_CFG2); | |
2153 | val &= ~ESP_CONFIG2_MAGIC; | |
2154 | if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { | |
2155 | /* If what we write to cfg2 does not come back, cfg2 is not | |
2156 | * implemented, therefore this must be a plain esp100. | |
2157 | */ | |
2158 | esp->rev = ESP100; | |
2159 | } else { | |
2160 | esp->config2 = 0; | |
2161 | esp_set_all_config3(esp, 5); | |
2162 | esp->prev_cfg3 = 5; | |
2163 | esp_write8(esp->config2, ESP_CFG2); | |
2164 | esp_write8(0, ESP_CFG3); | |
2165 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
2166 | ||
2167 | val = esp_read8(ESP_CFG3); | |
2168 | if (val != 5) { | |
2169 | /* The cfg2 register is implemented, however | |
2170 | * cfg3 is not, must be esp100a. | |
2171 | */ | |
2172 | esp->rev = ESP100A; | |
2173 | } else { | |
2174 | esp_set_all_config3(esp, 0); | |
2175 | esp->prev_cfg3 = 0; | |
2176 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
2177 | ||
2178 | /* All of cfg{1,2,3} implemented, must be one of | |
2179 | * the fas variants, figure out which one. | |
2180 | */ | |
2181 | if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) { | |
2182 | esp->rev = FAST; | |
2183 | esp->sync_defp = SYNC_DEFP_FAST; | |
2184 | } else { | |
2185 | esp->rev = ESP236; | |
2186 | } | |
2187 | esp->config2 = 0; | |
2188 | esp_write8(esp->config2, ESP_CFG2); | |
2189 | } | |
2190 | } | |
2191 | } | |
2192 | ||
2193 | static void __devinit esp_init_swstate(struct esp *esp) | |
2194 | { | |
2195 | int i; | |
2196 | ||
2197 | INIT_LIST_HEAD(&esp->queued_cmds); | |
2198 | INIT_LIST_HEAD(&esp->active_cmds); | |
2199 | INIT_LIST_HEAD(&esp->esp_cmd_pool); | |
2200 | ||
2201 | /* Start with a clear state, domain validation (via ->slave_configure, | |
2202 | * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged | |
2203 | * commands. | |
2204 | */ | |
2205 | for (i = 0 ; i < ESP_MAX_TARGET; i++) { | |
2206 | esp->target[i].flags = 0; | |
2207 | esp->target[i].nego_goal_period = 0; | |
2208 | esp->target[i].nego_goal_offset = 0; | |
2209 | esp->target[i].nego_goal_width = 0; | |
2210 | esp->target[i].nego_goal_tags = 0; | |
2211 | } | |
2212 | } | |
2213 | ||
2214 | /* This places the ESP into a known state at boot time. */ | |
d679f805 | 2215 | static void esp_bootup_reset(struct esp *esp) |
cd9ad58d DM |
2216 | { |
2217 | u8 val; | |
2218 | ||
2219 | /* Reset the DMA */ | |
2220 | esp->ops->reset_dma(esp); | |
2221 | ||
2222 | /* Reset the ESP */ | |
2223 | esp_reset_esp(esp); | |
2224 | ||
2225 | /* Reset the SCSI bus, but tell ESP not to generate an irq */ | |
2226 | val = esp_read8(ESP_CFG1); | |
2227 | val |= ESP_CONFIG1_SRRDISAB; | |
2228 | esp_write8(val, ESP_CFG1); | |
2229 | ||
2230 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2231 | udelay(400); | |
2232 | ||
2233 | esp_write8(esp->config1, ESP_CFG1); | |
2234 | ||
2235 | /* Eat any bitrot in the chip and we are done... */ | |
2236 | esp_read8(ESP_INTRPT); | |
2237 | } | |
2238 | ||
2239 | static void __devinit esp_set_clock_params(struct esp *esp) | |
2240 | { | |
2241 | int fmhz; | |
2242 | u8 ccf; | |
2243 | ||
2244 | /* This is getting messy but it has to be done correctly or else | |
2245 | * you get weird behavior all over the place. We are trying to | |
2246 | * basically figure out three pieces of information. | |
2247 | * | |
2248 | * a) Clock Conversion Factor | |
2249 | * | |
2250 | * This is a representation of the input crystal clock frequency | |
2251 | * going into the ESP on this machine. Any operation whose timing | |
2252 | * is longer than 400ns depends on this value being correct. For | |
2253 | * example, you'll get blips for arbitration/selection during high | |
2254 | * load or with multiple targets if this is not set correctly. | |
2255 | * | |
2256 | * b) Selection Time-Out | |
2257 | * | |
2258 | * The ESP isn't very bright and will arbitrate for the bus and try | |
2259 | * to select a target forever if you let it. This value tells the | |
2260 | * ESP when it has taken too long to negotiate and that it should | |
2261 | * interrupt the CPU so we can see what happened. The value is | |
2262 | * computed as follows (from NCR/Symbios chip docs). | |
2263 | * | |
2264 | * (Time Out Period) * (Input Clock) | |
2265 | * STO = ---------------------------------- | |
2266 | * (8192) * (Clock Conversion Factor) | |
2267 | * | |
2268 | * We use a time out period of 250ms (ESP_BUS_TIMEOUT). | |
2269 | * | |
2270 | * c) Imperical constants for synchronous offset and transfer period | |
2271 | * register values | |
2272 | * | |
2273 | * This entails the smallest and largest sync period we could ever | |
2274 | * handle on this ESP. | |
2275 | */ | |
2276 | fmhz = esp->cfreq; | |
2277 | ||
2278 | ccf = ((fmhz / 1000000) + 4) / 5; | |
2279 | if (ccf == 1) | |
2280 | ccf = 2; | |
2281 | ||
2282 | /* If we can't find anything reasonable, just assume 20MHZ. | |
2283 | * This is the clock frequency of the older sun4c's where I've | |
2284 | * been unable to find the clock-frequency PROM property. All | |
2285 | * other machines provide useful values it seems. | |
2286 | */ | |
2287 | if (fmhz <= 5000000 || ccf < 1 || ccf > 8) { | |
2288 | fmhz = 20000000; | |
2289 | ccf = 4; | |
2290 | } | |
2291 | ||
2292 | esp->cfact = (ccf == 8 ? 0 : ccf); | |
2293 | esp->cfreq = fmhz; | |
2294 | esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); | |
2295 | esp->ctick = ESP_TICK(ccf, esp->ccycle); | |
2296 | esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); | |
2297 | esp->sync_defp = SYNC_DEFP_SLOW; | |
2298 | } | |
2299 | ||
2300 | static const char *esp_chip_names[] = { | |
2301 | "ESP100", | |
2302 | "ESP100A", | |
2303 | "ESP236", | |
2304 | "FAS236", | |
2305 | "FAS100A", | |
2306 | "FAST", | |
2307 | "FASHME", | |
2308 | }; | |
2309 | ||
2310 | static struct scsi_transport_template *esp_transport_template; | |
2311 | ||
2312 | int __devinit scsi_esp_register(struct esp *esp, struct device *dev) | |
2313 | { | |
2314 | static int instance; | |
2315 | int err; | |
2316 | ||
2317 | esp->host->transportt = esp_transport_template; | |
2318 | esp->host->max_lun = ESP_MAX_LUN; | |
2319 | esp->host->cmd_per_lun = 2; | |
2320 | ||
2321 | esp_set_clock_params(esp); | |
2322 | ||
2323 | esp_get_revision(esp); | |
2324 | ||
2325 | esp_init_swstate(esp); | |
2326 | ||
2327 | esp_bootup_reset(esp); | |
2328 | ||
2329 | printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n", | |
2330 | esp->host->unique_id, esp->regs, esp->dma_regs, | |
2331 | esp->host->irq); | |
2332 | printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n", | |
2333 | esp->host->unique_id, esp_chip_names[esp->rev], | |
2334 | esp->cfreq / 1000000, esp->cfact, esp->scsi_id); | |
2335 | ||
2336 | /* Let the SCSI bus reset settle. */ | |
2337 | ssleep(esp_bus_reset_settle); | |
2338 | ||
2339 | err = scsi_add_host(esp->host, dev); | |
2340 | if (err) | |
2341 | return err; | |
2342 | ||
2343 | esp->host->unique_id = instance++; | |
2344 | ||
2345 | scsi_scan_host(esp->host); | |
2346 | ||
2347 | return 0; | |
2348 | } | |
2349 | EXPORT_SYMBOL(scsi_esp_register); | |
2350 | ||
2351 | void __devexit scsi_esp_unregister(struct esp *esp) | |
2352 | { | |
2353 | scsi_remove_host(esp->host); | |
2354 | } | |
2355 | EXPORT_SYMBOL(scsi_esp_unregister); | |
2356 | ||
2357 | static int esp_slave_alloc(struct scsi_device *dev) | |
2358 | { | |
2b14ec78 | 2359 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
2360 | struct esp_target_data *tp = &esp->target[dev->id]; |
2361 | struct esp_lun_data *lp; | |
2362 | ||
2363 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); | |
2364 | if (!lp) | |
2365 | return -ENOMEM; | |
2366 | dev->hostdata = lp; | |
2367 | ||
2368 | tp->starget = dev->sdev_target; | |
2369 | ||
2370 | spi_min_period(tp->starget) = esp->min_period; | |
2371 | spi_max_offset(tp->starget) = 15; | |
2372 | ||
2373 | if (esp->flags & ESP_FLAG_WIDE_CAPABLE) | |
2374 | spi_max_width(tp->starget) = 1; | |
2375 | else | |
2376 | spi_max_width(tp->starget) = 0; | |
2377 | ||
2378 | return 0; | |
2379 | } | |
2380 | ||
2381 | static int esp_slave_configure(struct scsi_device *dev) | |
2382 | { | |
2b14ec78 | 2383 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
2384 | struct esp_target_data *tp = &esp->target[dev->id]; |
2385 | int goal_tags, queue_depth; | |
2386 | ||
2387 | goal_tags = 0; | |
2388 | ||
2389 | if (dev->tagged_supported) { | |
2390 | /* XXX make this configurable somehow XXX */ | |
2391 | goal_tags = ESP_DEFAULT_TAGS; | |
2392 | ||
2393 | if (goal_tags > ESP_MAX_TAG) | |
2394 | goal_tags = ESP_MAX_TAG; | |
2395 | } | |
2396 | ||
2397 | queue_depth = goal_tags; | |
2398 | if (queue_depth < dev->host->cmd_per_lun) | |
2399 | queue_depth = dev->host->cmd_per_lun; | |
2400 | ||
2401 | if (goal_tags) { | |
2402 | scsi_set_tag_type(dev, MSG_ORDERED_TAG); | |
2403 | scsi_activate_tcq(dev, queue_depth); | |
2404 | } else { | |
2405 | scsi_deactivate_tcq(dev, queue_depth); | |
2406 | } | |
2407 | tp->flags |= ESP_TGT_DISCONNECT; | |
2408 | ||
2409 | if (!spi_initial_dv(dev->sdev_target)) | |
2410 | spi_dv_device(dev); | |
2411 | ||
2412 | return 0; | |
2413 | } | |
2414 | ||
2415 | static void esp_slave_destroy(struct scsi_device *dev) | |
2416 | { | |
2417 | struct esp_lun_data *lp = dev->hostdata; | |
2418 | ||
2419 | kfree(lp); | |
2420 | dev->hostdata = NULL; | |
2421 | } | |
2422 | ||
2423 | static int esp_eh_abort_handler(struct scsi_cmnd *cmd) | |
2424 | { | |
2b14ec78 | 2425 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2426 | struct esp_cmd_entry *ent, *tmp; |
2427 | struct completion eh_done; | |
2428 | unsigned long flags; | |
2429 | ||
2430 | /* XXX This helps a lot with debugging but might be a bit | |
2431 | * XXX much for the final driver. | |
2432 | */ | |
2433 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2434 | printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n", | |
2435 | esp->host->unique_id, cmd, cmd->cmnd[0]); | |
2436 | ent = esp->active_cmd; | |
2437 | if (ent) | |
2438 | printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n", | |
2439 | esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]); | |
2440 | list_for_each_entry(ent, &esp->queued_cmds, list) { | |
2441 | printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n", | |
2442 | esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]); | |
2443 | } | |
2444 | list_for_each_entry(ent, &esp->active_cmds, list) { | |
2445 | printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n", | |
2446 | esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]); | |
2447 | } | |
2448 | esp_dump_cmd_log(esp); | |
2449 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2450 | ||
2451 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2452 | ||
2453 | ent = NULL; | |
2454 | list_for_each_entry(tmp, &esp->queued_cmds, list) { | |
2455 | if (tmp->cmd == cmd) { | |
2456 | ent = tmp; | |
2457 | break; | |
2458 | } | |
2459 | } | |
2460 | ||
2461 | if (ent) { | |
2462 | /* Easiest case, we didn't even issue the command | |
2463 | * yet so it is trivial to abort. | |
2464 | */ | |
2465 | list_del(&ent->list); | |
2466 | ||
2467 | cmd->result = DID_ABORT << 16; | |
2468 | cmd->scsi_done(cmd); | |
2469 | ||
2470 | esp_put_ent(esp, ent); | |
2471 | ||
2472 | goto out_success; | |
2473 | } | |
2474 | ||
2475 | init_completion(&eh_done); | |
2476 | ||
2477 | ent = esp->active_cmd; | |
2478 | if (ent && ent->cmd == cmd) { | |
2479 | /* Command is the currently active command on | |
2480 | * the bus. If we already have an output message | |
2481 | * pending, no dice. | |
2482 | */ | |
2483 | if (esp->msg_out_len) | |
2484 | goto out_failure; | |
2485 | ||
2486 | /* Send out an abort, encouraging the target to | |
2487 | * go to MSGOUT phase by asserting ATN. | |
2488 | */ | |
2489 | esp->msg_out[0] = ABORT_TASK_SET; | |
2490 | esp->msg_out_len = 1; | |
2491 | ent->eh_done = &eh_done; | |
2492 | ||
2493 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
2494 | } else { | |
2495 | /* The command is disconnected. This is not easy to | |
2496 | * abort. For now we fail and let the scsi error | |
2497 | * handling layer go try a scsi bus reset or host | |
2498 | * reset. | |
2499 | * | |
2500 | * What we could do is put together a scsi command | |
2501 | * solely for the purpose of sending an abort message | |
2502 | * to the target. Coming up with all the code to | |
2503 | * cook up scsi commands, special case them everywhere, | |
2504 | * etc. is for questionable gain and it would be better | |
2505 | * if the generic scsi error handling layer could do at | |
2506 | * least some of that for us. | |
2507 | * | |
2508 | * Anyways this is an area for potential future improvement | |
2509 | * in this driver. | |
2510 | */ | |
2511 | goto out_failure; | |
2512 | } | |
2513 | ||
2514 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2515 | ||
2516 | if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) { | |
2517 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2518 | ent->eh_done = NULL; | |
2519 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2520 | ||
2521 | return FAILED; | |
2522 | } | |
2523 | ||
2524 | return SUCCESS; | |
2525 | ||
2526 | out_success: | |
2527 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2528 | return SUCCESS; | |
2529 | ||
2530 | out_failure: | |
2531 | /* XXX This might be a good location to set ESP_TGT_BROKEN | |
2532 | * XXX since we know which target/lun in particular is | |
2533 | * XXX causing trouble. | |
2534 | */ | |
2535 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2536 | return FAILED; | |
2537 | } | |
2538 | ||
2539 | static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd) | |
2540 | { | |
2b14ec78 | 2541 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2542 | struct completion eh_reset; |
2543 | unsigned long flags; | |
2544 | ||
2545 | init_completion(&eh_reset); | |
2546 | ||
2547 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2548 | ||
2549 | esp->eh_reset = &eh_reset; | |
2550 | ||
2551 | /* XXX This is too simple... We should add lots of | |
2552 | * XXX checks here so that if we find that the chip is | |
2553 | * XXX very wedged we return failure immediately so | |
2554 | * XXX that we can perform a full chip reset. | |
2555 | */ | |
2556 | esp->flags |= ESP_FLAG_RESETTING; | |
2557 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2558 | ||
2559 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2560 | ||
2561 | ssleep(esp_bus_reset_settle); | |
2562 | ||
2563 | if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) { | |
2564 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2565 | esp->eh_reset = NULL; | |
2566 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2567 | ||
2568 | return FAILED; | |
2569 | } | |
2570 | ||
2571 | return SUCCESS; | |
2572 | } | |
2573 | ||
2574 | /* All bets are off, reset the entire device. */ | |
2575 | static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
2576 | { | |
2b14ec78 | 2577 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2578 | unsigned long flags; |
2579 | ||
2580 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2581 | esp_bootup_reset(esp); | |
2582 | esp_reset_cleanup(esp); | |
2583 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2584 | ||
2585 | ssleep(esp_bus_reset_settle); | |
2586 | ||
2587 | return SUCCESS; | |
2588 | } | |
2589 | ||
2590 | static const char *esp_info(struct Scsi_Host *host) | |
2591 | { | |
2592 | return "esp"; | |
2593 | } | |
2594 | ||
2595 | struct scsi_host_template scsi_esp_template = { | |
2596 | .module = THIS_MODULE, | |
2597 | .name = "esp", | |
2598 | .info = esp_info, | |
2599 | .queuecommand = esp_queuecommand, | |
2600 | .slave_alloc = esp_slave_alloc, | |
2601 | .slave_configure = esp_slave_configure, | |
2602 | .slave_destroy = esp_slave_destroy, | |
2603 | .eh_abort_handler = esp_eh_abort_handler, | |
2604 | .eh_bus_reset_handler = esp_eh_bus_reset_handler, | |
2605 | .eh_host_reset_handler = esp_eh_host_reset_handler, | |
2606 | .can_queue = 7, | |
2607 | .this_id = 7, | |
2608 | .sg_tablesize = SG_ALL, | |
2609 | .use_clustering = ENABLE_CLUSTERING, | |
2610 | .max_sectors = 0xffff, | |
2611 | .skip_settle_delay = 1, | |
2612 | }; | |
2613 | EXPORT_SYMBOL(scsi_esp_template); | |
2614 | ||
2615 | static void esp_get_signalling(struct Scsi_Host *host) | |
2616 | { | |
2b14ec78 | 2617 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2618 | enum spi_signal_type type; |
2619 | ||
2620 | if (esp->flags & ESP_FLAG_DIFFERENTIAL) | |
2621 | type = SPI_SIGNAL_HVD; | |
2622 | else | |
2623 | type = SPI_SIGNAL_SE; | |
2624 | ||
2625 | spi_signalling(host) = type; | |
2626 | } | |
2627 | ||
2628 | static void esp_set_offset(struct scsi_target *target, int offset) | |
2629 | { | |
2630 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2631 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2632 | struct esp_target_data *tp = &esp->target[target->id]; |
2633 | ||
2634 | tp->nego_goal_offset = offset; | |
2635 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2636 | } | |
2637 | ||
2638 | static void esp_set_period(struct scsi_target *target, int period) | |
2639 | { | |
2640 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2641 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2642 | struct esp_target_data *tp = &esp->target[target->id]; |
2643 | ||
2644 | tp->nego_goal_period = period; | |
2645 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2646 | } | |
2647 | ||
2648 | static void esp_set_width(struct scsi_target *target, int width) | |
2649 | { | |
2650 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2651 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2652 | struct esp_target_data *tp = &esp->target[target->id]; |
2653 | ||
2654 | tp->nego_goal_width = (width ? 1 : 0); | |
2655 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2656 | } | |
2657 | ||
2658 | static struct spi_function_template esp_transport_ops = { | |
2659 | .set_offset = esp_set_offset, | |
2660 | .show_offset = 1, | |
2661 | .set_period = esp_set_period, | |
2662 | .show_period = 1, | |
2663 | .set_width = esp_set_width, | |
2664 | .show_width = 1, | |
2665 | .get_signalling = esp_get_signalling, | |
2666 | }; | |
2667 | ||
2668 | static int __init esp_init(void) | |
2669 | { | |
2670 | BUILD_BUG_ON(sizeof(struct scsi_pointer) < | |
2671 | sizeof(struct esp_cmd_priv)); | |
2672 | ||
2673 | esp_transport_template = spi_attach_transport(&esp_transport_ops); | |
2674 | if (!esp_transport_template) | |
2675 | return -ENODEV; | |
2676 | ||
2677 | return 0; | |
2678 | } | |
2679 | ||
2680 | static void __exit esp_exit(void) | |
2681 | { | |
2682 | spi_release_transport(esp_transport_template); | |
2683 | } | |
2684 | ||
2685 | MODULE_DESCRIPTION("ESP SCSI driver core"); | |
2686 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
2687 | MODULE_LICENSE("GPL"); | |
2688 | MODULE_VERSION(DRV_VERSION); | |
2689 | ||
2690 | module_param(esp_bus_reset_settle, int, 0); | |
2691 | MODULE_PARM_DESC(esp_bus_reset_settle, | |
2692 | "ESP scsi bus reset delay in seconds"); | |
2693 | ||
2694 | module_param(esp_debug, int, 0); | |
2695 | MODULE_PARM_DESC(esp_debug, | |
2696 | "ESP bitmapped debugging message enable value:\n" | |
2697 | " 0x00000001 Log interrupt events\n" | |
2698 | " 0x00000002 Log scsi commands\n" | |
2699 | " 0x00000004 Log resets\n" | |
2700 | " 0x00000008 Log message in events\n" | |
2701 | " 0x00000010 Log message out events\n" | |
2702 | " 0x00000020 Log command completion\n" | |
2703 | " 0x00000040 Log disconnects\n" | |
2704 | " 0x00000080 Log data start\n" | |
2705 | " 0x00000100 Log data done\n" | |
2706 | " 0x00000200 Log reconnects\n" | |
2707 | " 0x00000400 Log auto-sense data\n" | |
2708 | ); | |
2709 | ||
2710 | module_init(esp_init); | |
2711 | module_exit(esp_exit); |