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cd9ad58d DM |
1 | /* esp_scsi.c: ESP SCSI driver. |
2 | * | |
3 | * Copyright (C) 2007 David S. Miller (davem@davemloft.net) | |
4 | */ | |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/types.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/delay.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/completion.h> | |
12 | #include <linux/kallsyms.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/init.h> | |
e1f2a094 | 16 | #include <linux/irqreturn.h> |
cd9ad58d DM |
17 | |
18 | #include <asm/irq.h> | |
19 | #include <asm/io.h> | |
20 | #include <asm/dma.h> | |
21 | ||
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/scsi_host.h> | |
24 | #include <scsi/scsi_cmnd.h> | |
25 | #include <scsi/scsi_device.h> | |
26 | #include <scsi/scsi_tcq.h> | |
27 | #include <scsi/scsi_dbg.h> | |
28 | #include <scsi/scsi_transport_spi.h> | |
29 | ||
30 | #include "esp_scsi.h" | |
31 | ||
32 | #define DRV_MODULE_NAME "esp" | |
33 | #define PFX DRV_MODULE_NAME ": " | |
34 | #define DRV_VERSION "2.000" | |
35 | #define DRV_MODULE_RELDATE "April 19, 2007" | |
36 | ||
37 | /* SCSI bus reset settle time in seconds. */ | |
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); | |
a793804f DM |
222 | if (esp->rev == FAST) |
223 | esp_write8(ESP_CONFIG2_FENAB, ESP_CFG2); | |
cd9ad58d DM |
224 | scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); |
225 | ||
cd9ad58d DM |
226 | /* This is the only point at which it is reliable to read |
227 | * the ID-code for a fast ESP chip variants. | |
228 | */ | |
229 | esp->max_period = ((35 * esp->ccycle) / 1000); | |
230 | if (esp->rev == FAST) { | |
231 | version = esp_read8(ESP_UID); | |
232 | family_code = (version & 0xf8) >> 3; | |
233 | if (family_code == 0x02) | |
234 | esp->rev = FAS236; | |
235 | else if (family_code == 0x0a) | |
236 | esp->rev = FASHME; /* Version is usually '5'. */ | |
237 | else | |
238 | esp->rev = FAS100A; | |
239 | esp->min_period = ((4 * esp->ccycle) / 1000); | |
240 | } else { | |
241 | esp->min_period = ((5 * esp->ccycle) / 1000); | |
242 | } | |
243 | esp->max_period = (esp->max_period + 3)>>2; | |
244 | esp->min_period = (esp->min_period + 3)>>2; | |
245 | ||
246 | esp_write8(esp->config1, ESP_CFG1); | |
247 | switch (esp->rev) { | |
248 | case ESP100: | |
249 | /* nothing to do */ | |
250 | break; | |
251 | ||
252 | case ESP100A: | |
253 | esp_write8(esp->config2, ESP_CFG2); | |
254 | break; | |
255 | ||
256 | case ESP236: | |
257 | /* Slow 236 */ | |
258 | esp_write8(esp->config2, ESP_CFG2); | |
259 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
260 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
261 | break; | |
262 | ||
263 | case FASHME: | |
264 | esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB); | |
265 | /* fallthrough... */ | |
266 | ||
267 | case FAS236: | |
268 | /* Fast 236 or HME */ | |
269 | esp_write8(esp->config2, ESP_CFG2); | |
270 | if (esp->rev == FASHME) { | |
271 | u8 cfg3 = esp->target[0].esp_config3; | |
272 | ||
273 | cfg3 |= ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH; | |
274 | if (esp->scsi_id >= 8) | |
275 | cfg3 |= ESP_CONFIG3_IDBIT3; | |
276 | esp_set_all_config3(esp, cfg3); | |
277 | } else { | |
278 | u32 cfg3 = esp->target[0].esp_config3; | |
279 | ||
280 | cfg3 |= ESP_CONFIG3_FCLK; | |
281 | esp_set_all_config3(esp, cfg3); | |
282 | } | |
283 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
284 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
285 | if (esp->rev == FASHME) { | |
286 | esp->radelay = 80; | |
287 | } else { | |
288 | if (esp->flags & ESP_FLAG_DIFFERENTIAL) | |
289 | esp->radelay = 0; | |
290 | else | |
291 | esp->radelay = 96; | |
292 | } | |
293 | break; | |
294 | ||
295 | case FAS100A: | |
296 | /* Fast 100a */ | |
297 | esp_write8(esp->config2, ESP_CFG2); | |
298 | esp_set_all_config3(esp, | |
299 | (esp->target[0].esp_config3 | | |
300 | ESP_CONFIG3_FCLOCK)); | |
301 | esp->prev_cfg3 = esp->target[0].esp_config3; | |
302 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
303 | esp->radelay = 32; | |
304 | break; | |
305 | ||
306 | default: | |
307 | break; | |
308 | } | |
309 | ||
a793804f DM |
310 | /* Reload the configuration registers */ |
311 | esp_write8(esp->cfact, ESP_CFACT); | |
312 | ||
313 | esp->prev_stp = 0; | |
314 | esp_write8(esp->prev_stp, ESP_STP); | |
315 | ||
316 | esp->prev_soff = 0; | |
317 | esp_write8(esp->prev_soff, ESP_SOFF); | |
318 | ||
319 | esp_write8(esp->neg_defp, ESP_TIMEO); | |
320 | ||
cd9ad58d DM |
321 | /* Eat any bitrot in the chip */ |
322 | esp_read8(ESP_INTRPT); | |
323 | udelay(100); | |
324 | } | |
325 | ||
326 | static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd) | |
327 | { | |
328 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
4c2baaaf | 329 | struct scatterlist *sg = scsi_sglist(cmd); |
cd9ad58d DM |
330 | int dir = cmd->sc_data_direction; |
331 | int total, i; | |
332 | ||
333 | if (dir == DMA_NONE) | |
334 | return; | |
335 | ||
4c2baaaf | 336 | spriv->u.num_sg = esp->ops->map_sg(esp, sg, scsi_sg_count(cmd), dir); |
cd9ad58d DM |
337 | spriv->cur_residue = sg_dma_len(sg); |
338 | spriv->cur_sg = sg; | |
339 | ||
340 | total = 0; | |
341 | for (i = 0; i < spriv->u.num_sg; i++) | |
342 | total += sg_dma_len(&sg[i]); | |
343 | spriv->tot_residue = total; | |
344 | } | |
345 | ||
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 | ||
4c2baaaf | 409 | esp->ops->unmap_sg(esp, scsi_sglist(cmd), spriv->u.num_sg, dir); |
cd9ad58d DM |
410 | } |
411 | ||
412 | static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent) | |
413 | { | |
414 | struct scsi_cmnd *cmd = ent->cmd; | |
415 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
416 | ||
417 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
418 | ent->saved_sense_ptr = ent->sense_ptr; | |
419 | return; | |
420 | } | |
421 | ent->saved_cur_residue = spriv->cur_residue; | |
422 | ent->saved_cur_sg = spriv->cur_sg; | |
423 | ent->saved_tot_residue = spriv->tot_residue; | |
424 | } | |
425 | ||
426 | static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent) | |
427 | { | |
428 | struct scsi_cmnd *cmd = ent->cmd; | |
429 | struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); | |
430 | ||
431 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
432 | ent->sense_ptr = ent->saved_sense_ptr; | |
433 | return; | |
434 | } | |
435 | spriv->cur_residue = ent->saved_cur_residue; | |
436 | spriv->cur_sg = ent->saved_cur_sg; | |
437 | spriv->tot_residue = ent->saved_tot_residue; | |
438 | } | |
439 | ||
440 | static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd) | |
441 | { | |
442 | if (cmd->cmd_len == 6 || | |
443 | cmd->cmd_len == 10 || | |
444 | cmd->cmd_len == 12) { | |
445 | esp->flags &= ~ESP_FLAG_DOING_SLOWCMD; | |
446 | } else { | |
447 | esp->flags |= ESP_FLAG_DOING_SLOWCMD; | |
448 | } | |
449 | } | |
450 | ||
451 | static void esp_write_tgt_config3(struct esp *esp, int tgt) | |
452 | { | |
453 | if (esp->rev > ESP100A) { | |
454 | u8 val = esp->target[tgt].esp_config3; | |
455 | ||
456 | if (val != esp->prev_cfg3) { | |
457 | esp->prev_cfg3 = val; | |
458 | esp_write8(val, ESP_CFG3); | |
459 | } | |
460 | } | |
461 | } | |
462 | ||
463 | static void esp_write_tgt_sync(struct esp *esp, int tgt) | |
464 | { | |
465 | u8 off = esp->target[tgt].esp_offset; | |
466 | u8 per = esp->target[tgt].esp_period; | |
467 | ||
468 | if (off != esp->prev_soff) { | |
469 | esp->prev_soff = off; | |
470 | esp_write8(off, ESP_SOFF); | |
471 | } | |
472 | if (per != esp->prev_stp) { | |
473 | esp->prev_stp = per; | |
474 | esp_write8(per, ESP_STP); | |
475 | } | |
476 | } | |
477 | ||
478 | static u32 esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len) | |
479 | { | |
480 | if (esp->rev == FASHME) { | |
481 | /* Arbitrary segment boundaries, 24-bit counts. */ | |
482 | if (dma_len > (1U << 24)) | |
483 | dma_len = (1U << 24); | |
484 | } else { | |
485 | u32 base, end; | |
486 | ||
487 | /* ESP chip limits other variants by 16-bits of transfer | |
488 | * count. Actually on FAS100A and FAS236 we could get | |
489 | * 24-bits of transfer count by enabling ESP_CONFIG2_FENAB | |
490 | * in the ESP_CFG2 register but that causes other unwanted | |
491 | * changes so we don't use it currently. | |
492 | */ | |
493 | if (dma_len > (1U << 16)) | |
494 | dma_len = (1U << 16); | |
495 | ||
496 | /* All of the DMA variants hooked up to these chips | |
497 | * cannot handle crossing a 24-bit address boundary. | |
498 | */ | |
499 | base = dma_addr & ((1U << 24) - 1U); | |
500 | end = base + dma_len; | |
501 | if (end > (1U << 24)) | |
502 | end = (1U <<24); | |
503 | dma_len = end - base; | |
504 | } | |
505 | return dma_len; | |
506 | } | |
507 | ||
508 | static int esp_need_to_nego_wide(struct esp_target_data *tp) | |
509 | { | |
510 | struct scsi_target *target = tp->starget; | |
511 | ||
512 | return spi_width(target) != tp->nego_goal_width; | |
513 | } | |
514 | ||
515 | static int esp_need_to_nego_sync(struct esp_target_data *tp) | |
516 | { | |
517 | struct scsi_target *target = tp->starget; | |
518 | ||
519 | /* When offset is zero, period is "don't care". */ | |
520 | if (!spi_offset(target) && !tp->nego_goal_offset) | |
521 | return 0; | |
522 | ||
523 | if (spi_offset(target) == tp->nego_goal_offset && | |
524 | spi_period(target) == tp->nego_goal_period) | |
525 | return 0; | |
526 | ||
527 | return 1; | |
528 | } | |
529 | ||
530 | static int esp_alloc_lun_tag(struct esp_cmd_entry *ent, | |
531 | struct esp_lun_data *lp) | |
532 | { | |
533 | if (!ent->tag[0]) { | |
534 | /* Non-tagged, slot already taken? */ | |
535 | if (lp->non_tagged_cmd) | |
536 | return -EBUSY; | |
537 | ||
538 | if (lp->hold) { | |
539 | /* We are being held by active tagged | |
540 | * commands. | |
541 | */ | |
542 | if (lp->num_tagged) | |
543 | return -EBUSY; | |
544 | ||
545 | /* Tagged commands completed, we can unplug | |
546 | * the queue and run this untagged command. | |
547 | */ | |
548 | lp->hold = 0; | |
549 | } else if (lp->num_tagged) { | |
550 | /* Plug the queue until num_tagged decreases | |
551 | * to zero in esp_free_lun_tag. | |
552 | */ | |
553 | lp->hold = 1; | |
554 | return -EBUSY; | |
555 | } | |
556 | ||
557 | lp->non_tagged_cmd = ent; | |
558 | return 0; | |
559 | } else { | |
560 | /* Tagged command, see if blocked by a | |
561 | * non-tagged one. | |
562 | */ | |
563 | if (lp->non_tagged_cmd || lp->hold) | |
564 | return -EBUSY; | |
565 | } | |
566 | ||
567 | BUG_ON(lp->tagged_cmds[ent->tag[1]]); | |
568 | ||
569 | lp->tagged_cmds[ent->tag[1]] = ent; | |
570 | lp->num_tagged++; | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | static void esp_free_lun_tag(struct esp_cmd_entry *ent, | |
576 | struct esp_lun_data *lp) | |
577 | { | |
578 | if (ent->tag[0]) { | |
579 | BUG_ON(lp->tagged_cmds[ent->tag[1]] != ent); | |
580 | lp->tagged_cmds[ent->tag[1]] = NULL; | |
581 | lp->num_tagged--; | |
582 | } else { | |
583 | BUG_ON(lp->non_tagged_cmd != ent); | |
584 | lp->non_tagged_cmd = NULL; | |
585 | } | |
586 | } | |
587 | ||
588 | /* When a contingent allegiance conditon is created, we force feed a | |
589 | * REQUEST_SENSE command to the device to fetch the sense data. I | |
590 | * tried many other schemes, relying on the scsi error handling layer | |
591 | * to send out the REQUEST_SENSE automatically, but this was difficult | |
592 | * to get right especially in the presence of applications like smartd | |
593 | * which use SG_IO to send out their own REQUEST_SENSE commands. | |
594 | */ | |
595 | static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent) | |
596 | { | |
597 | struct scsi_cmnd *cmd = ent->cmd; | |
598 | struct scsi_device *dev = cmd->device; | |
599 | int tgt, lun; | |
600 | u8 *p, val; | |
601 | ||
602 | tgt = dev->id; | |
603 | lun = dev->lun; | |
604 | ||
605 | ||
606 | if (!ent->sense_ptr) { | |
607 | esp_log_autosense("esp%d: Doing auto-sense for " | |
608 | "tgt[%d] lun[%d]\n", | |
609 | esp->host->unique_id, tgt, lun); | |
610 | ||
611 | ent->sense_ptr = cmd->sense_buffer; | |
612 | ent->sense_dma = esp->ops->map_single(esp, | |
613 | ent->sense_ptr, | |
614 | SCSI_SENSE_BUFFERSIZE, | |
615 | DMA_FROM_DEVICE); | |
616 | } | |
617 | ent->saved_sense_ptr = ent->sense_ptr; | |
618 | ||
619 | esp->active_cmd = ent; | |
620 | ||
621 | p = esp->command_block; | |
622 | esp->msg_out_len = 0; | |
623 | ||
624 | *p++ = IDENTIFY(0, lun); | |
625 | *p++ = REQUEST_SENSE; | |
626 | *p++ = ((dev->scsi_level <= SCSI_2) ? | |
627 | (lun << 5) : 0); | |
628 | *p++ = 0; | |
629 | *p++ = 0; | |
630 | *p++ = SCSI_SENSE_BUFFERSIZE; | |
631 | *p++ = 0; | |
632 | ||
633 | esp->select_state = ESP_SELECT_BASIC; | |
634 | ||
635 | val = tgt; | |
636 | if (esp->rev == FASHME) | |
637 | val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT; | |
638 | esp_write8(val, ESP_BUSID); | |
639 | ||
640 | esp_write_tgt_sync(esp, tgt); | |
641 | esp_write_tgt_config3(esp, tgt); | |
642 | ||
643 | val = (p - esp->command_block); | |
644 | ||
645 | if (esp->rev == FASHME) | |
646 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
647 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
648 | val, 16, 0, ESP_CMD_DMA | ESP_CMD_SELA); | |
649 | } | |
650 | ||
651 | static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp) | |
652 | { | |
653 | struct esp_cmd_entry *ent; | |
654 | ||
655 | list_for_each_entry(ent, &esp->queued_cmds, list) { | |
656 | struct scsi_cmnd *cmd = ent->cmd; | |
657 | struct scsi_device *dev = cmd->device; | |
658 | struct esp_lun_data *lp = dev->hostdata; | |
659 | ||
660 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
661 | ent->tag[0] = 0; | |
662 | ent->tag[1] = 0; | |
663 | return ent; | |
664 | } | |
665 | ||
666 | if (!scsi_populate_tag_msg(cmd, &ent->tag[0])) { | |
667 | ent->tag[0] = 0; | |
668 | ent->tag[1] = 0; | |
669 | } | |
670 | ||
671 | if (esp_alloc_lun_tag(ent, lp) < 0) | |
672 | continue; | |
673 | ||
674 | return ent; | |
675 | } | |
676 | ||
677 | return NULL; | |
678 | } | |
679 | ||
680 | static void esp_maybe_execute_command(struct esp *esp) | |
681 | { | |
682 | struct esp_target_data *tp; | |
683 | struct esp_lun_data *lp; | |
684 | struct scsi_device *dev; | |
685 | struct scsi_cmnd *cmd; | |
686 | struct esp_cmd_entry *ent; | |
687 | int tgt, lun, i; | |
688 | u32 val, start_cmd; | |
689 | u8 *p; | |
690 | ||
691 | if (esp->active_cmd || | |
692 | (esp->flags & ESP_FLAG_RESETTING)) | |
693 | return; | |
694 | ||
695 | ent = find_and_prep_issuable_command(esp); | |
696 | if (!ent) | |
697 | return; | |
698 | ||
699 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
700 | esp_autosense(esp, ent); | |
701 | return; | |
702 | } | |
703 | ||
704 | cmd = ent->cmd; | |
705 | dev = cmd->device; | |
706 | tgt = dev->id; | |
707 | lun = dev->lun; | |
708 | tp = &esp->target[tgt]; | |
709 | lp = dev->hostdata; | |
710 | ||
63ce2499 | 711 | list_move(&ent->list, &esp->active_cmds); |
cd9ad58d DM |
712 | |
713 | esp->active_cmd = ent; | |
714 | ||
715 | esp_map_dma(esp, cmd); | |
716 | esp_save_pointers(esp, ent); | |
717 | ||
718 | esp_check_command_len(esp, cmd); | |
719 | ||
720 | p = esp->command_block; | |
721 | ||
722 | esp->msg_out_len = 0; | |
723 | if (tp->flags & ESP_TGT_CHECK_NEGO) { | |
724 | /* Need to negotiate. If the target is broken | |
725 | * go for synchronous transfers and non-wide. | |
726 | */ | |
727 | if (tp->flags & ESP_TGT_BROKEN) { | |
728 | tp->flags &= ~ESP_TGT_DISCONNECT; | |
729 | tp->nego_goal_period = 0; | |
730 | tp->nego_goal_offset = 0; | |
731 | tp->nego_goal_width = 0; | |
732 | tp->nego_goal_tags = 0; | |
733 | } | |
734 | ||
735 | /* If the settings are not changing, skip this. */ | |
736 | if (spi_width(tp->starget) == tp->nego_goal_width && | |
737 | spi_period(tp->starget) == tp->nego_goal_period && | |
738 | spi_offset(tp->starget) == tp->nego_goal_offset) { | |
739 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
740 | goto build_identify; | |
741 | } | |
742 | ||
743 | if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) { | |
744 | esp->msg_out_len = | |
745 | spi_populate_width_msg(&esp->msg_out[0], | |
746 | (tp->nego_goal_width ? | |
747 | 1 : 0)); | |
748 | tp->flags |= ESP_TGT_NEGO_WIDE; | |
749 | } else if (esp_need_to_nego_sync(tp)) { | |
750 | esp->msg_out_len = | |
751 | spi_populate_sync_msg(&esp->msg_out[0], | |
752 | tp->nego_goal_period, | |
753 | tp->nego_goal_offset); | |
754 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
755 | } else { | |
756 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
757 | } | |
758 | ||
759 | /* Process it like a slow command. */ | |
760 | if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC)) | |
761 | esp->flags |= ESP_FLAG_DOING_SLOWCMD; | |
762 | } | |
763 | ||
764 | build_identify: | |
765 | /* If we don't have a lun-data struct yet, we're probing | |
766 | * so do not disconnect. Also, do not disconnect unless | |
767 | * we have a tag on this command. | |
768 | */ | |
769 | if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0]) | |
770 | *p++ = IDENTIFY(1, lun); | |
771 | else | |
772 | *p++ = IDENTIFY(0, lun); | |
773 | ||
774 | if (ent->tag[0] && esp->rev == ESP100) { | |
775 | /* ESP100 lacks select w/atn3 command, use select | |
776 | * and stop instead. | |
777 | */ | |
778 | esp->flags |= ESP_FLAG_DOING_SLOWCMD; | |
779 | } | |
780 | ||
781 | if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) { | |
782 | start_cmd = ESP_CMD_DMA | ESP_CMD_SELA; | |
783 | if (ent->tag[0]) { | |
784 | *p++ = ent->tag[0]; | |
785 | *p++ = ent->tag[1]; | |
786 | ||
787 | start_cmd = ESP_CMD_DMA | ESP_CMD_SA3; | |
788 | } | |
789 | ||
790 | for (i = 0; i < cmd->cmd_len; i++) | |
791 | *p++ = cmd->cmnd[i]; | |
792 | ||
793 | esp->select_state = ESP_SELECT_BASIC; | |
794 | } else { | |
795 | esp->cmd_bytes_left = cmd->cmd_len; | |
796 | esp->cmd_bytes_ptr = &cmd->cmnd[0]; | |
797 | ||
798 | if (ent->tag[0]) { | |
799 | for (i = esp->msg_out_len - 1; | |
800 | i >= 0; i--) | |
801 | esp->msg_out[i + 2] = esp->msg_out[i]; | |
802 | esp->msg_out[0] = ent->tag[0]; | |
803 | esp->msg_out[1] = ent->tag[1]; | |
804 | esp->msg_out_len += 2; | |
805 | } | |
806 | ||
807 | start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS; | |
808 | esp->select_state = ESP_SELECT_MSGOUT; | |
809 | } | |
810 | val = tgt; | |
811 | if (esp->rev == FASHME) | |
812 | val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT; | |
813 | esp_write8(val, ESP_BUSID); | |
814 | ||
815 | esp_write_tgt_sync(esp, tgt); | |
816 | esp_write_tgt_config3(esp, tgt); | |
817 | ||
818 | val = (p - esp->command_block); | |
819 | ||
820 | if (esp_debug & ESP_DEBUG_SCSICMD) { | |
821 | printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun); | |
822 | for (i = 0; i < cmd->cmd_len; i++) | |
823 | printk("%02x ", cmd->cmnd[i]); | |
824 | printk("]\n"); | |
825 | } | |
826 | ||
827 | if (esp->rev == FASHME) | |
828 | scsi_esp_cmd(esp, ESP_CMD_FLUSH); | |
829 | esp->ops->send_dma_cmd(esp, esp->command_block_dma, | |
830 | val, 16, 0, start_cmd); | |
831 | } | |
832 | ||
833 | static struct esp_cmd_entry *esp_get_ent(struct esp *esp) | |
834 | { | |
835 | struct list_head *head = &esp->esp_cmd_pool; | |
836 | struct esp_cmd_entry *ret; | |
837 | ||
838 | if (list_empty(head)) { | |
839 | ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC); | |
840 | } else { | |
841 | ret = list_entry(head->next, struct esp_cmd_entry, list); | |
842 | list_del(&ret->list); | |
843 | memset(ret, 0, sizeof(*ret)); | |
844 | } | |
845 | return ret; | |
846 | } | |
847 | ||
848 | static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent) | |
849 | { | |
850 | list_add(&ent->list, &esp->esp_cmd_pool); | |
851 | } | |
852 | ||
853 | static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent, | |
854 | struct scsi_cmnd *cmd, unsigned int result) | |
855 | { | |
856 | struct scsi_device *dev = cmd->device; | |
857 | int tgt = dev->id; | |
858 | int lun = dev->lun; | |
859 | ||
860 | esp->active_cmd = NULL; | |
861 | esp_unmap_dma(esp, cmd); | |
862 | esp_free_lun_tag(ent, dev->hostdata); | |
863 | cmd->result = result; | |
864 | ||
865 | if (ent->eh_done) { | |
866 | complete(ent->eh_done); | |
867 | ent->eh_done = NULL; | |
868 | } | |
869 | ||
870 | if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { | |
871 | esp->ops->unmap_single(esp, ent->sense_dma, | |
872 | SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); | |
873 | ent->sense_ptr = NULL; | |
874 | ||
875 | /* Restore the message/status bytes to what we actually | |
876 | * saw originally. Also, report that we are providing | |
877 | * the sense data. | |
878 | */ | |
879 | cmd->result = ((DRIVER_SENSE << 24) | | |
880 | (DID_OK << 16) | | |
881 | (COMMAND_COMPLETE << 8) | | |
882 | (SAM_STAT_CHECK_CONDITION << 0)); | |
883 | ||
884 | ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE; | |
885 | if (esp_debug & ESP_DEBUG_AUTOSENSE) { | |
886 | int i; | |
887 | ||
888 | printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ", | |
889 | esp->host->unique_id, tgt, lun); | |
890 | for (i = 0; i < 18; i++) | |
891 | printk("%02x ", cmd->sense_buffer[i]); | |
892 | printk("]\n"); | |
893 | } | |
894 | } | |
895 | ||
896 | cmd->scsi_done(cmd); | |
897 | ||
898 | list_del(&ent->list); | |
899 | esp_put_ent(esp, ent); | |
900 | ||
901 | esp_maybe_execute_command(esp); | |
902 | } | |
903 | ||
904 | static unsigned int compose_result(unsigned int status, unsigned int message, | |
905 | unsigned int driver_code) | |
906 | { | |
907 | return (status | (message << 8) | (driver_code << 16)); | |
908 | } | |
909 | ||
910 | static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent) | |
911 | { | |
912 | struct scsi_device *dev = ent->cmd->device; | |
913 | struct esp_lun_data *lp = dev->hostdata; | |
914 | ||
915 | scsi_track_queue_full(dev, lp->num_tagged - 1); | |
916 | } | |
917 | ||
f281233d | 918 | static int esp_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) |
cd9ad58d DM |
919 | { |
920 | struct scsi_device *dev = cmd->device; | |
2b14ec78 | 921 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
922 | struct esp_cmd_priv *spriv; |
923 | struct esp_cmd_entry *ent; | |
924 | ||
925 | ent = esp_get_ent(esp); | |
926 | if (!ent) | |
927 | return SCSI_MLQUEUE_HOST_BUSY; | |
928 | ||
929 | ent->cmd = cmd; | |
930 | ||
931 | cmd->scsi_done = done; | |
932 | ||
933 | spriv = ESP_CMD_PRIV(cmd); | |
934 | spriv->u.dma_addr = ~(dma_addr_t)0x0; | |
935 | ||
936 | list_add_tail(&ent->list, &esp->queued_cmds); | |
937 | ||
938 | esp_maybe_execute_command(esp); | |
939 | ||
940 | return 0; | |
941 | } | |
942 | ||
f281233d JG |
943 | static DEF_SCSI_QCMD(esp_queuecommand) |
944 | ||
cd9ad58d DM |
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, " | |
6fe07aaf | 984 | "sreg=%02x.\n", |
cd9ad58d DM |
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 | { | |
2975b023 | 1003 | esp_log_reset("ESP: esp_schedule_reset() from %pf\n", |
cd9ad58d DM |
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 | ||
70f23fd6 | 1061 | /* ACK the message. */ |
cd9ad58d DM |
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 | */ | |
63ce2499 | 1246 | list_move(&ent->list, &esp->queued_cmds); |
cd9ad58d DM |
1247 | esp->active_cmd = NULL; |
1248 | ||
1249 | /* Return value ignored by caller, it directly invokes | |
1250 | * esp_reconnect(). | |
1251 | */ | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | if (esp->ireg == ESP_INTR_DC) { | |
1256 | struct scsi_device *dev = cmd->device; | |
1257 | ||
1258 | /* Disconnect. Make sure we re-negotiate sync and | |
1259 | * wide parameters if this target starts responding | |
1260 | * again in the future. | |
1261 | */ | |
1262 | esp->target[dev->id].flags |= ESP_TGT_CHECK_NEGO; | |
1263 | ||
1264 | scsi_esp_cmd(esp, ESP_CMD_ESEL); | |
1265 | esp_cmd_is_done(esp, ent, cmd, (DID_BAD_TARGET << 16)); | |
1266 | return 1; | |
1267 | } | |
1268 | ||
1269 | if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { | |
1270 | /* Selection successful. On pre-FAST chips we have | |
1271 | * to do a NOP and possibly clean out the FIFO. | |
1272 | */ | |
1273 | if (esp->rev <= ESP236) { | |
1274 | int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
1275 | ||
1276 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1277 | ||
1278 | if (!fcnt && | |
1279 | (!esp->prev_soff || | |
1280 | ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) | |
1281 | esp_flush_fifo(esp); | |
1282 | } | |
1283 | ||
1284 | /* If we are doing a slow command, negotiation, etc. | |
1285 | * we'll do the right thing as we transition to the | |
1286 | * next phase. | |
1287 | */ | |
1288 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | printk("ESP: Unexpected selection completion ireg[%x].\n", | |
1293 | esp->ireg); | |
1294 | esp_schedule_reset(esp); | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent, | |
1299 | struct scsi_cmnd *cmd) | |
1300 | { | |
1301 | int fifo_cnt, ecount, bytes_sent, flush_fifo; | |
1302 | ||
1303 | fifo_cnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES; | |
1304 | if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE) | |
1305 | fifo_cnt <<= 1; | |
1306 | ||
1307 | ecount = 0; | |
1308 | if (!(esp->sreg & ESP_STAT_TCNT)) { | |
1309 | ecount = ((unsigned int)esp_read8(ESP_TCLOW) | | |
1310 | (((unsigned int)esp_read8(ESP_TCMED)) << 8)); | |
1311 | if (esp->rev == FASHME) | |
1312 | ecount |= ((unsigned int)esp_read8(FAS_RLO)) << 16; | |
1313 | } | |
1314 | ||
1315 | bytes_sent = esp->data_dma_len; | |
1316 | bytes_sent -= ecount; | |
1317 | ||
1318 | if (!(ent->flags & ESP_CMD_FLAG_WRITE)) | |
1319 | bytes_sent -= fifo_cnt; | |
1320 | ||
1321 | flush_fifo = 0; | |
1322 | if (!esp->prev_soff) { | |
1323 | /* Synchronous data transfer, always flush fifo. */ | |
1324 | flush_fifo = 1; | |
1325 | } else { | |
1326 | if (esp->rev == ESP100) { | |
1327 | u32 fflags, phase; | |
1328 | ||
1329 | /* ESP100 has a chip bug where in the synchronous data | |
1330 | * phase it can mistake a final long REQ pulse from the | |
1331 | * target as an extra data byte. Fun. | |
1332 | * | |
1333 | * To detect this case we resample the status register | |
1334 | * and fifo flags. If we're still in a data phase and | |
1335 | * we see spurious chunks in the fifo, we return error | |
1336 | * to the caller which should reset and set things up | |
1337 | * such that we only try future transfers to this | |
1338 | * target in synchronous mode. | |
1339 | */ | |
1340 | esp->sreg = esp_read8(ESP_STATUS); | |
1341 | phase = esp->sreg & ESP_STAT_PMASK; | |
1342 | fflags = esp_read8(ESP_FFLAGS); | |
1343 | ||
1344 | if ((phase == ESP_DOP && | |
1345 | (fflags & ESP_FF_ONOTZERO)) || | |
1346 | (phase == ESP_DIP && | |
1347 | (fflags & ESP_FF_FBYTES))) | |
1348 | return -1; | |
1349 | } | |
1350 | if (!(ent->flags & ESP_CMD_FLAG_WRITE)) | |
1351 | flush_fifo = 1; | |
1352 | } | |
1353 | ||
1354 | if (flush_fifo) | |
1355 | esp_flush_fifo(esp); | |
1356 | ||
1357 | return bytes_sent; | |
1358 | } | |
1359 | ||
1360 | static void esp_setsync(struct esp *esp, struct esp_target_data *tp, | |
1361 | u8 scsi_period, u8 scsi_offset, | |
1362 | u8 esp_stp, u8 esp_soff) | |
1363 | { | |
1364 | spi_period(tp->starget) = scsi_period; | |
1365 | spi_offset(tp->starget) = scsi_offset; | |
1366 | spi_width(tp->starget) = (tp->flags & ESP_TGT_WIDE) ? 1 : 0; | |
1367 | ||
1368 | if (esp_soff) { | |
1369 | esp_stp &= 0x1f; | |
1370 | esp_soff |= esp->radelay; | |
1371 | if (esp->rev >= FAS236) { | |
1372 | u8 bit = ESP_CONFIG3_FSCSI; | |
1373 | if (esp->rev >= FAS100A) | |
1374 | bit = ESP_CONFIG3_FAST; | |
1375 | ||
1376 | if (scsi_period < 50) { | |
1377 | if (esp->rev == FASHME) | |
1378 | esp_soff &= ~esp->radelay; | |
1379 | tp->esp_config3 |= bit; | |
1380 | } else { | |
1381 | tp->esp_config3 &= ~bit; | |
1382 | } | |
1383 | esp->prev_cfg3 = tp->esp_config3; | |
1384 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | tp->esp_period = esp->prev_stp = esp_stp; | |
1389 | tp->esp_offset = esp->prev_soff = esp_soff; | |
1390 | ||
1391 | esp_write8(esp_soff, ESP_SOFF); | |
1392 | esp_write8(esp_stp, ESP_STP); | |
1393 | ||
1394 | tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO); | |
1395 | ||
1396 | spi_display_xfer_agreement(tp->starget); | |
1397 | } | |
1398 | ||
1399 | static void esp_msgin_reject(struct esp *esp) | |
1400 | { | |
1401 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1402 | struct scsi_cmnd *cmd = ent->cmd; | |
1403 | struct esp_target_data *tp; | |
1404 | int tgt; | |
1405 | ||
1406 | tgt = cmd->device->id; | |
1407 | tp = &esp->target[tgt]; | |
1408 | ||
1409 | if (tp->flags & ESP_TGT_NEGO_WIDE) { | |
1410 | tp->flags &= ~(ESP_TGT_NEGO_WIDE | ESP_TGT_WIDE); | |
1411 | ||
1412 | if (!esp_need_to_nego_sync(tp)) { | |
1413 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
1414 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1415 | } else { | |
1416 | esp->msg_out_len = | |
1417 | spi_populate_sync_msg(&esp->msg_out[0], | |
1418 | tp->nego_goal_period, | |
1419 | tp->nego_goal_offset); | |
1420 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
1421 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1422 | } | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | if (tp->flags & ESP_TGT_NEGO_SYNC) { | |
1427 | tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO); | |
1428 | tp->esp_period = 0; | |
1429 | tp->esp_offset = 0; | |
1430 | esp_setsync(esp, tp, 0, 0, 0, 0); | |
1431 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1432 | return; | |
1433 | } | |
1434 | ||
1435 | esp->msg_out[0] = ABORT_TASK_SET; | |
1436 | esp->msg_out_len = 1; | |
1437 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1438 | } | |
1439 | ||
1440 | static void esp_msgin_sdtr(struct esp *esp, struct esp_target_data *tp) | |
1441 | { | |
1442 | u8 period = esp->msg_in[3]; | |
1443 | u8 offset = esp->msg_in[4]; | |
1444 | u8 stp; | |
1445 | ||
1446 | if (!(tp->flags & ESP_TGT_NEGO_SYNC)) | |
1447 | goto do_reject; | |
1448 | ||
1449 | if (offset > 15) | |
1450 | goto do_reject; | |
1451 | ||
1452 | if (offset) { | |
237abac6 | 1453 | int one_clock; |
cd9ad58d DM |
1454 | |
1455 | if (period > esp->max_period) { | |
1456 | period = offset = 0; | |
1457 | goto do_sdtr; | |
1458 | } | |
1459 | if (period < esp->min_period) | |
1460 | goto do_reject; | |
1461 | ||
1462 | one_clock = esp->ccycle / 1000; | |
237abac6 | 1463 | stp = DIV_ROUND_UP(period << 2, one_clock); |
cd9ad58d DM |
1464 | if (stp && esp->rev >= FAS236) { |
1465 | if (stp >= 50) | |
1466 | stp--; | |
1467 | } | |
1468 | } else { | |
1469 | stp = 0; | |
1470 | } | |
1471 | ||
1472 | esp_setsync(esp, tp, period, offset, stp, offset); | |
1473 | return; | |
1474 | ||
1475 | do_reject: | |
1476 | esp->msg_out[0] = MESSAGE_REJECT; | |
1477 | esp->msg_out_len = 1; | |
1478 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1479 | return; | |
1480 | ||
1481 | do_sdtr: | |
1482 | tp->nego_goal_period = period; | |
1483 | tp->nego_goal_offset = offset; | |
1484 | esp->msg_out_len = | |
1485 | spi_populate_sync_msg(&esp->msg_out[0], | |
1486 | tp->nego_goal_period, | |
1487 | tp->nego_goal_offset); | |
1488 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1489 | } | |
1490 | ||
1491 | static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp) | |
1492 | { | |
1493 | int size = 8 << esp->msg_in[3]; | |
1494 | u8 cfg3; | |
1495 | ||
1496 | if (esp->rev != FASHME) | |
1497 | goto do_reject; | |
1498 | ||
1499 | if (size != 8 && size != 16) | |
1500 | goto do_reject; | |
1501 | ||
1502 | if (!(tp->flags & ESP_TGT_NEGO_WIDE)) | |
1503 | goto do_reject; | |
1504 | ||
1505 | cfg3 = tp->esp_config3; | |
1506 | if (size == 16) { | |
1507 | tp->flags |= ESP_TGT_WIDE; | |
1508 | cfg3 |= ESP_CONFIG3_EWIDE; | |
1509 | } else { | |
1510 | tp->flags &= ~ESP_TGT_WIDE; | |
1511 | cfg3 &= ~ESP_CONFIG3_EWIDE; | |
1512 | } | |
1513 | tp->esp_config3 = cfg3; | |
1514 | esp->prev_cfg3 = cfg3; | |
1515 | esp_write8(cfg3, ESP_CFG3); | |
1516 | ||
1517 | tp->flags &= ~ESP_TGT_NEGO_WIDE; | |
1518 | ||
1519 | spi_period(tp->starget) = 0; | |
1520 | spi_offset(tp->starget) = 0; | |
1521 | if (!esp_need_to_nego_sync(tp)) { | |
1522 | tp->flags &= ~ESP_TGT_CHECK_NEGO; | |
1523 | scsi_esp_cmd(esp, ESP_CMD_RATN); | |
1524 | } else { | |
1525 | esp->msg_out_len = | |
1526 | spi_populate_sync_msg(&esp->msg_out[0], | |
1527 | tp->nego_goal_period, | |
1528 | tp->nego_goal_offset); | |
1529 | tp->flags |= ESP_TGT_NEGO_SYNC; | |
1530 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1531 | } | |
1532 | return; | |
1533 | ||
1534 | do_reject: | |
1535 | esp->msg_out[0] = MESSAGE_REJECT; | |
1536 | esp->msg_out_len = 1; | |
1537 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1538 | } | |
1539 | ||
1540 | static void esp_msgin_extended(struct esp *esp) | |
1541 | { | |
1542 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1543 | struct scsi_cmnd *cmd = ent->cmd; | |
1544 | struct esp_target_data *tp; | |
1545 | int tgt = cmd->device->id; | |
1546 | ||
1547 | tp = &esp->target[tgt]; | |
1548 | if (esp->msg_in[2] == EXTENDED_SDTR) { | |
1549 | esp_msgin_sdtr(esp, tp); | |
1550 | return; | |
1551 | } | |
1552 | if (esp->msg_in[2] == EXTENDED_WDTR) { | |
1553 | esp_msgin_wdtr(esp, tp); | |
1554 | return; | |
1555 | } | |
1556 | ||
1557 | printk("ESP: Unexpected extended msg type %x\n", | |
1558 | esp->msg_in[2]); | |
1559 | ||
1560 | esp->msg_out[0] = ABORT_TASK_SET; | |
1561 | esp->msg_out_len = 1; | |
1562 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1563 | } | |
1564 | ||
1565 | /* Analyze msgin bytes received from target so far. Return non-zero | |
1566 | * if there are more bytes needed to complete the message. | |
1567 | */ | |
1568 | static int esp_msgin_process(struct esp *esp) | |
1569 | { | |
1570 | u8 msg0 = esp->msg_in[0]; | |
1571 | int len = esp->msg_in_len; | |
1572 | ||
1573 | if (msg0 & 0x80) { | |
1574 | /* Identify */ | |
1575 | printk("ESP: Unexpected msgin identify\n"); | |
1576 | return 0; | |
1577 | } | |
1578 | ||
1579 | switch (msg0) { | |
1580 | case EXTENDED_MESSAGE: | |
1581 | if (len == 1) | |
1582 | return 1; | |
1583 | if (len < esp->msg_in[1] + 2) | |
1584 | return 1; | |
1585 | esp_msgin_extended(esp); | |
1586 | return 0; | |
1587 | ||
1588 | case IGNORE_WIDE_RESIDUE: { | |
1589 | struct esp_cmd_entry *ent; | |
1590 | struct esp_cmd_priv *spriv; | |
1591 | if (len == 1) | |
1592 | return 1; | |
1593 | ||
1594 | if (esp->msg_in[1] != 1) | |
1595 | goto do_reject; | |
1596 | ||
1597 | ent = esp->active_cmd; | |
1598 | spriv = ESP_CMD_PRIV(ent->cmd); | |
1599 | ||
1600 | if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) { | |
1601 | spriv->cur_sg--; | |
1602 | spriv->cur_residue = 1; | |
1603 | } else | |
1604 | spriv->cur_residue++; | |
1605 | spriv->tot_residue++; | |
1606 | return 0; | |
1607 | } | |
1608 | case NOP: | |
1609 | return 0; | |
1610 | case RESTORE_POINTERS: | |
1611 | esp_restore_pointers(esp, esp->active_cmd); | |
1612 | return 0; | |
1613 | case SAVE_POINTERS: | |
1614 | esp_save_pointers(esp, esp->active_cmd); | |
1615 | return 0; | |
1616 | ||
1617 | case COMMAND_COMPLETE: | |
1618 | case DISCONNECT: { | |
1619 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1620 | ||
1621 | ent->message = msg0; | |
1622 | esp_event(esp, ESP_EVENT_FREE_BUS); | |
1623 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1624 | return 0; | |
1625 | } | |
1626 | case MESSAGE_REJECT: | |
1627 | esp_msgin_reject(esp); | |
1628 | return 0; | |
1629 | ||
1630 | default: | |
1631 | do_reject: | |
1632 | esp->msg_out[0] = MESSAGE_REJECT; | |
1633 | esp->msg_out_len = 1; | |
1634 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
1635 | return 0; | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | static int esp_process_event(struct esp *esp) | |
1640 | { | |
1641 | int write; | |
1642 | ||
1643 | again: | |
1644 | write = 0; | |
1645 | switch (esp->event) { | |
1646 | case ESP_EVENT_CHECK_PHASE: | |
1647 | switch (esp->sreg & ESP_STAT_PMASK) { | |
1648 | case ESP_DOP: | |
1649 | esp_event(esp, ESP_EVENT_DATA_OUT); | |
1650 | break; | |
1651 | case ESP_DIP: | |
1652 | esp_event(esp, ESP_EVENT_DATA_IN); | |
1653 | break; | |
1654 | case ESP_STATP: | |
1655 | esp_flush_fifo(esp); | |
1656 | scsi_esp_cmd(esp, ESP_CMD_ICCSEQ); | |
1657 | esp_event(esp, ESP_EVENT_STATUS); | |
1658 | esp->flags |= ESP_FLAG_QUICKIRQ_CHECK; | |
1659 | return 1; | |
1660 | ||
1661 | case ESP_MOP: | |
1662 | esp_event(esp, ESP_EVENT_MSGOUT); | |
1663 | break; | |
1664 | ||
1665 | case ESP_MIP: | |
1666 | esp_event(esp, ESP_EVENT_MSGIN); | |
1667 | break; | |
1668 | ||
1669 | case ESP_CMDP: | |
1670 | esp_event(esp, ESP_EVENT_CMD_START); | |
1671 | break; | |
1672 | ||
1673 | default: | |
1674 | printk("ESP: Unexpected phase, sreg=%02x\n", | |
1675 | esp->sreg); | |
1676 | esp_schedule_reset(esp); | |
1677 | return 0; | |
1678 | } | |
1679 | goto again; | |
1680 | break; | |
1681 | ||
1682 | case ESP_EVENT_DATA_IN: | |
1683 | write = 1; | |
1684 | /* fallthru */ | |
1685 | ||
1686 | case ESP_EVENT_DATA_OUT: { | |
1687 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1688 | struct scsi_cmnd *cmd = ent->cmd; | |
1689 | dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd); | |
1690 | unsigned int dma_len = esp_cur_dma_len(ent, cmd); | |
1691 | ||
1692 | if (esp->rev == ESP100) | |
1693 | scsi_esp_cmd(esp, ESP_CMD_NULL); | |
1694 | ||
1695 | if (write) | |
1696 | ent->flags |= ESP_CMD_FLAG_WRITE; | |
1697 | else | |
1698 | ent->flags &= ~ESP_CMD_FLAG_WRITE; | |
1699 | ||
6fe07aaf FT |
1700 | if (esp->ops->dma_length_limit) |
1701 | dma_len = esp->ops->dma_length_limit(esp, dma_addr, | |
1702 | dma_len); | |
1703 | else | |
1704 | dma_len = esp_dma_length_limit(esp, dma_addr, dma_len); | |
1705 | ||
cd9ad58d DM |
1706 | esp->data_dma_len = dma_len; |
1707 | ||
1708 | if (!dma_len) { | |
1709 | printk(KERN_ERR PFX "esp%d: DMA length is zero!\n", | |
1710 | esp->host->unique_id); | |
e1f2a094 | 1711 | printk(KERN_ERR PFX "esp%d: cur adr[%08llx] len[%08x]\n", |
cd9ad58d | 1712 | esp->host->unique_id, |
e1f2a094 | 1713 | (unsigned long long)esp_cur_dma_addr(ent, cmd), |
cd9ad58d DM |
1714 | esp_cur_dma_len(ent, cmd)); |
1715 | esp_schedule_reset(esp); | |
1716 | return 0; | |
1717 | } | |
1718 | ||
e1f2a094 | 1719 | esp_log_datastart("ESP: start data addr[%08llx] len[%u] " |
cd9ad58d | 1720 | "write(%d)\n", |
e1f2a094 | 1721 | (unsigned long long)dma_addr, dma_len, write); |
cd9ad58d DM |
1722 | |
1723 | esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len, | |
1724 | write, ESP_CMD_DMA | ESP_CMD_TI); | |
1725 | esp_event(esp, ESP_EVENT_DATA_DONE); | |
1726 | break; | |
1727 | } | |
1728 | case ESP_EVENT_DATA_DONE: { | |
1729 | struct esp_cmd_entry *ent = esp->active_cmd; | |
1730 | struct scsi_cmnd *cmd = ent->cmd; | |
1731 | int bytes_sent; | |
1732 | ||
1733 | if (esp->ops->dma_error(esp)) { | |
1734 | printk("ESP: data done, DMA error, resetting\n"); | |
1735 | esp_schedule_reset(esp); | |
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | if (ent->flags & ESP_CMD_FLAG_WRITE) { | |
1740 | /* XXX parity errors, etc. XXX */ | |
1741 | ||
1742 | esp->ops->dma_drain(esp); | |
1743 | } | |
1744 | esp->ops->dma_invalidate(esp); | |
1745 | ||
1746 | if (esp->ireg != ESP_INTR_BSERV) { | |
1747 | /* We should always see exactly a bus-service | |
1748 | * interrupt at the end of a successful transfer. | |
1749 | */ | |
1750 | printk("ESP: data done, not BSERV, resetting\n"); | |
1751 | esp_schedule_reset(esp); | |
1752 | return 0; | |
1753 | } | |
1754 | ||
1755 | bytes_sent = esp_data_bytes_sent(esp, ent, cmd); | |
1756 | ||
1757 | esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n", | |
1758 | ent->flags, bytes_sent); | |
1759 | ||
1760 | if (bytes_sent < 0) { | |
1761 | /* XXX force sync mode for this target XXX */ | |
1762 | esp_schedule_reset(esp); | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | esp_advance_dma(esp, ent, cmd, bytes_sent); | |
1767 | esp_event(esp, ESP_EVENT_CHECK_PHASE); | |
1768 | goto again; | |
cd9ad58d DM |
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) | |
522939d4 MR |
2033 | __starget_for_each_device(tp->starget, NULL, |
2034 | esp_clear_hold); | |
cd9ad58d | 2035 | } |
204abf28 | 2036 | esp->flags &= ~ESP_FLAG_RESETTING; |
cd9ad58d DM |
2037 | } |
2038 | ||
2039 | /* Runs under host->lock */ | |
2040 | static void __esp_interrupt(struct esp *esp) | |
2041 | { | |
2042 | int finish_reset, intr_done; | |
2043 | u8 phase; | |
2044 | ||
2045 | esp->sreg = esp_read8(ESP_STATUS); | |
2046 | ||
2047 | if (esp->flags & ESP_FLAG_RESETTING) { | |
2048 | finish_reset = 1; | |
2049 | } else { | |
2050 | if (esp_check_gross_error(esp)) | |
2051 | return; | |
2052 | ||
2053 | finish_reset = esp_check_spur_intr(esp); | |
2054 | if (finish_reset < 0) | |
2055 | return; | |
2056 | } | |
2057 | ||
2058 | esp->ireg = esp_read8(ESP_INTRPT); | |
2059 | ||
2060 | if (esp->ireg & ESP_INTR_SR) | |
2061 | finish_reset = 1; | |
2062 | ||
2063 | if (finish_reset) { | |
2064 | esp_reset_cleanup(esp); | |
2065 | if (esp->eh_reset) { | |
2066 | complete(esp->eh_reset); | |
2067 | esp->eh_reset = NULL; | |
2068 | } | |
2069 | return; | |
2070 | } | |
2071 | ||
2072 | phase = (esp->sreg & ESP_STAT_PMASK); | |
2073 | if (esp->rev == FASHME) { | |
2074 | if (((phase != ESP_DIP && phase != ESP_DOP) && | |
2075 | esp->select_state == ESP_SELECT_NONE && | |
2076 | esp->event != ESP_EVENT_STATUS && | |
2077 | esp->event != ESP_EVENT_DATA_DONE) || | |
2078 | (esp->ireg & ESP_INTR_RSEL)) { | |
2079 | esp->sreg2 = esp_read8(ESP_STATUS2); | |
2080 | if (!(esp->sreg2 & ESP_STAT2_FEMPTY) || | |
2081 | (esp->sreg2 & ESP_STAT2_F1BYTE)) | |
2082 | hme_read_fifo(esp); | |
2083 | } | |
2084 | } | |
2085 | ||
2086 | esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] " | |
2087 | "sreg2[%02x] ireg[%02x]\n", | |
2088 | esp->sreg, esp->seqreg, esp->sreg2, esp->ireg); | |
2089 | ||
2090 | intr_done = 0; | |
2091 | ||
2092 | if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) { | |
2093 | printk("ESP: unexpected IREG %02x\n", esp->ireg); | |
2094 | if (esp->ireg & ESP_INTR_IC) | |
2095 | esp_dump_cmd_log(esp); | |
2096 | ||
2097 | esp_schedule_reset(esp); | |
2098 | } else { | |
2099 | if (!(esp->ireg & ESP_INTR_RSEL)) { | |
2100 | /* Some combination of FDONE, BSERV, DC. */ | |
2101 | if (esp->select_state != ESP_SELECT_NONE) | |
2102 | intr_done = esp_finish_select(esp); | |
2103 | } else if (esp->ireg & ESP_INTR_RSEL) { | |
2104 | if (esp->active_cmd) | |
2105 | (void) esp_finish_select(esp); | |
2106 | intr_done = esp_reconnect(esp); | |
2107 | } | |
2108 | } | |
2109 | while (!intr_done) | |
2110 | intr_done = esp_process_event(esp); | |
2111 | } | |
2112 | ||
2113 | irqreturn_t scsi_esp_intr(int irq, void *dev_id) | |
2114 | { | |
2115 | struct esp *esp = dev_id; | |
2116 | unsigned long flags; | |
2117 | irqreturn_t ret; | |
2118 | ||
2119 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2120 | ret = IRQ_NONE; | |
2121 | if (esp->ops->irq_pending(esp)) { | |
2122 | ret = IRQ_HANDLED; | |
2123 | for (;;) { | |
2124 | int i; | |
2125 | ||
2126 | __esp_interrupt(esp); | |
2127 | if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK)) | |
2128 | break; | |
2129 | esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK; | |
2130 | ||
2131 | for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) { | |
2132 | if (esp->ops->irq_pending(esp)) | |
2133 | break; | |
2134 | } | |
2135 | if (i == ESP_QUICKIRQ_LIMIT) | |
2136 | break; | |
2137 | } | |
2138 | } | |
2139 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2140 | ||
2141 | return ret; | |
2142 | } | |
2143 | EXPORT_SYMBOL(scsi_esp_intr); | |
2144 | ||
76246808 | 2145 | static void esp_get_revision(struct esp *esp) |
cd9ad58d DM |
2146 | { |
2147 | u8 val; | |
2148 | ||
2149 | esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); | |
2150 | esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); | |
2151 | esp_write8(esp->config2, ESP_CFG2); | |
2152 | ||
2153 | val = esp_read8(ESP_CFG2); | |
2154 | val &= ~ESP_CONFIG2_MAGIC; | |
2155 | if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { | |
2156 | /* If what we write to cfg2 does not come back, cfg2 is not | |
2157 | * implemented, therefore this must be a plain esp100. | |
2158 | */ | |
2159 | esp->rev = ESP100; | |
2160 | } else { | |
2161 | esp->config2 = 0; | |
2162 | esp_set_all_config3(esp, 5); | |
2163 | esp->prev_cfg3 = 5; | |
2164 | esp_write8(esp->config2, ESP_CFG2); | |
2165 | esp_write8(0, ESP_CFG3); | |
2166 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
2167 | ||
2168 | val = esp_read8(ESP_CFG3); | |
2169 | if (val != 5) { | |
2170 | /* The cfg2 register is implemented, however | |
2171 | * cfg3 is not, must be esp100a. | |
2172 | */ | |
2173 | esp->rev = ESP100A; | |
2174 | } else { | |
2175 | esp_set_all_config3(esp, 0); | |
2176 | esp->prev_cfg3 = 0; | |
2177 | esp_write8(esp->prev_cfg3, ESP_CFG3); | |
2178 | ||
2179 | /* All of cfg{1,2,3} implemented, must be one of | |
2180 | * the fas variants, figure out which one. | |
2181 | */ | |
2182 | if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) { | |
2183 | esp->rev = FAST; | |
2184 | esp->sync_defp = SYNC_DEFP_FAST; | |
2185 | } else { | |
2186 | esp->rev = ESP236; | |
2187 | } | |
2188 | esp->config2 = 0; | |
2189 | esp_write8(esp->config2, ESP_CFG2); | |
2190 | } | |
2191 | } | |
2192 | } | |
2193 | ||
76246808 | 2194 | static void esp_init_swstate(struct esp *esp) |
cd9ad58d DM |
2195 | { |
2196 | int i; | |
2197 | ||
2198 | INIT_LIST_HEAD(&esp->queued_cmds); | |
2199 | INIT_LIST_HEAD(&esp->active_cmds); | |
2200 | INIT_LIST_HEAD(&esp->esp_cmd_pool); | |
2201 | ||
2202 | /* Start with a clear state, domain validation (via ->slave_configure, | |
2203 | * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged | |
2204 | * commands. | |
2205 | */ | |
2206 | for (i = 0 ; i < ESP_MAX_TARGET; i++) { | |
2207 | esp->target[i].flags = 0; | |
2208 | esp->target[i].nego_goal_period = 0; | |
2209 | esp->target[i].nego_goal_offset = 0; | |
2210 | esp->target[i].nego_goal_width = 0; | |
2211 | esp->target[i].nego_goal_tags = 0; | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | /* This places the ESP into a known state at boot time. */ | |
d679f805 | 2216 | static void esp_bootup_reset(struct esp *esp) |
cd9ad58d DM |
2217 | { |
2218 | u8 val; | |
2219 | ||
2220 | /* Reset the DMA */ | |
2221 | esp->ops->reset_dma(esp); | |
2222 | ||
2223 | /* Reset the ESP */ | |
2224 | esp_reset_esp(esp); | |
2225 | ||
2226 | /* Reset the SCSI bus, but tell ESP not to generate an irq */ | |
2227 | val = esp_read8(ESP_CFG1); | |
2228 | val |= ESP_CONFIG1_SRRDISAB; | |
2229 | esp_write8(val, ESP_CFG1); | |
2230 | ||
2231 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2232 | udelay(400); | |
2233 | ||
2234 | esp_write8(esp->config1, ESP_CFG1); | |
2235 | ||
2236 | /* Eat any bitrot in the chip and we are done... */ | |
2237 | esp_read8(ESP_INTRPT); | |
2238 | } | |
2239 | ||
76246808 | 2240 | static void esp_set_clock_params(struct esp *esp) |
cd9ad58d | 2241 | { |
6fe07aaf | 2242 | int fhz; |
cd9ad58d DM |
2243 | u8 ccf; |
2244 | ||
2245 | /* This is getting messy but it has to be done correctly or else | |
2246 | * you get weird behavior all over the place. We are trying to | |
2247 | * basically figure out three pieces of information. | |
2248 | * | |
2249 | * a) Clock Conversion Factor | |
2250 | * | |
2251 | * This is a representation of the input crystal clock frequency | |
2252 | * going into the ESP on this machine. Any operation whose timing | |
2253 | * is longer than 400ns depends on this value being correct. For | |
2254 | * example, you'll get blips for arbitration/selection during high | |
2255 | * load or with multiple targets if this is not set correctly. | |
2256 | * | |
2257 | * b) Selection Time-Out | |
2258 | * | |
2259 | * The ESP isn't very bright and will arbitrate for the bus and try | |
2260 | * to select a target forever if you let it. This value tells the | |
2261 | * ESP when it has taken too long to negotiate and that it should | |
2262 | * interrupt the CPU so we can see what happened. The value is | |
2263 | * computed as follows (from NCR/Symbios chip docs). | |
2264 | * | |
2265 | * (Time Out Period) * (Input Clock) | |
2266 | * STO = ---------------------------------- | |
2267 | * (8192) * (Clock Conversion Factor) | |
2268 | * | |
2269 | * We use a time out period of 250ms (ESP_BUS_TIMEOUT). | |
2270 | * | |
2271 | * c) Imperical constants for synchronous offset and transfer period | |
2272 | * register values | |
2273 | * | |
2274 | * This entails the smallest and largest sync period we could ever | |
2275 | * handle on this ESP. | |
2276 | */ | |
6fe07aaf | 2277 | fhz = esp->cfreq; |
cd9ad58d | 2278 | |
6fe07aaf | 2279 | ccf = ((fhz / 1000000) + 4) / 5; |
cd9ad58d DM |
2280 | if (ccf == 1) |
2281 | ccf = 2; | |
2282 | ||
2283 | /* If we can't find anything reasonable, just assume 20MHZ. | |
2284 | * This is the clock frequency of the older sun4c's where I've | |
2285 | * been unable to find the clock-frequency PROM property. All | |
2286 | * other machines provide useful values it seems. | |
2287 | */ | |
6fe07aaf FT |
2288 | if (fhz <= 5000000 || ccf < 1 || ccf > 8) { |
2289 | fhz = 20000000; | |
cd9ad58d DM |
2290 | ccf = 4; |
2291 | } | |
2292 | ||
2293 | esp->cfact = (ccf == 8 ? 0 : ccf); | |
6fe07aaf FT |
2294 | esp->cfreq = fhz; |
2295 | esp->ccycle = ESP_HZ_TO_CYCLE(fhz); | |
cd9ad58d | 2296 | esp->ctick = ESP_TICK(ccf, esp->ccycle); |
6fe07aaf | 2297 | esp->neg_defp = ESP_NEG_DEFP(fhz, ccf); |
cd9ad58d DM |
2298 | esp->sync_defp = SYNC_DEFP_SLOW; |
2299 | } | |
2300 | ||
2301 | static const char *esp_chip_names[] = { | |
2302 | "ESP100", | |
2303 | "ESP100A", | |
2304 | "ESP236", | |
2305 | "FAS236", | |
2306 | "FAS100A", | |
2307 | "FAST", | |
2308 | "FASHME", | |
2309 | }; | |
2310 | ||
2311 | static struct scsi_transport_template *esp_transport_template; | |
2312 | ||
76246808 | 2313 | int scsi_esp_register(struct esp *esp, struct device *dev) |
cd9ad58d DM |
2314 | { |
2315 | static int instance; | |
2316 | int err; | |
2317 | ||
2318 | esp->host->transportt = esp_transport_template; | |
2319 | esp->host->max_lun = ESP_MAX_LUN; | |
2320 | esp->host->cmd_per_lun = 2; | |
ff4abd6c | 2321 | esp->host->unique_id = instance; |
cd9ad58d DM |
2322 | |
2323 | esp_set_clock_params(esp); | |
2324 | ||
2325 | esp_get_revision(esp); | |
2326 | ||
2327 | esp_init_swstate(esp); | |
2328 | ||
2329 | esp_bootup_reset(esp); | |
2330 | ||
2331 | printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n", | |
2332 | esp->host->unique_id, esp->regs, esp->dma_regs, | |
2333 | esp->host->irq); | |
2334 | printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n", | |
2335 | esp->host->unique_id, esp_chip_names[esp->rev], | |
2336 | esp->cfreq / 1000000, esp->cfact, esp->scsi_id); | |
2337 | ||
2338 | /* Let the SCSI bus reset settle. */ | |
2339 | ssleep(esp_bus_reset_settle); | |
2340 | ||
2341 | err = scsi_add_host(esp->host, dev); | |
2342 | if (err) | |
2343 | return err; | |
2344 | ||
ff4abd6c | 2345 | instance++; |
cd9ad58d DM |
2346 | |
2347 | scsi_scan_host(esp->host); | |
2348 | ||
2349 | return 0; | |
2350 | } | |
2351 | EXPORT_SYMBOL(scsi_esp_register); | |
2352 | ||
76246808 | 2353 | void scsi_esp_unregister(struct esp *esp) |
cd9ad58d DM |
2354 | { |
2355 | scsi_remove_host(esp->host); | |
2356 | } | |
2357 | EXPORT_SYMBOL(scsi_esp_unregister); | |
2358 | ||
ec5e69f6 JB |
2359 | static int esp_target_alloc(struct scsi_target *starget) |
2360 | { | |
2361 | struct esp *esp = shost_priv(dev_to_shost(&starget->dev)); | |
2362 | struct esp_target_data *tp = &esp->target[starget->id]; | |
2363 | ||
2364 | tp->starget = starget; | |
2365 | ||
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | static void esp_target_destroy(struct scsi_target *starget) | |
2370 | { | |
2371 | struct esp *esp = shost_priv(dev_to_shost(&starget->dev)); | |
2372 | struct esp_target_data *tp = &esp->target[starget->id]; | |
2373 | ||
2374 | tp->starget = NULL; | |
2375 | } | |
2376 | ||
cd9ad58d DM |
2377 | static int esp_slave_alloc(struct scsi_device *dev) |
2378 | { | |
2b14ec78 | 2379 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
2380 | struct esp_target_data *tp = &esp->target[dev->id]; |
2381 | struct esp_lun_data *lp; | |
2382 | ||
2383 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); | |
2384 | if (!lp) | |
2385 | return -ENOMEM; | |
2386 | dev->hostdata = lp; | |
2387 | ||
cd9ad58d DM |
2388 | spi_min_period(tp->starget) = esp->min_period; |
2389 | spi_max_offset(tp->starget) = 15; | |
2390 | ||
2391 | if (esp->flags & ESP_FLAG_WIDE_CAPABLE) | |
2392 | spi_max_width(tp->starget) = 1; | |
2393 | else | |
2394 | spi_max_width(tp->starget) = 0; | |
2395 | ||
2396 | return 0; | |
2397 | } | |
2398 | ||
2399 | static int esp_slave_configure(struct scsi_device *dev) | |
2400 | { | |
2b14ec78 | 2401 | struct esp *esp = shost_priv(dev->host); |
cd9ad58d DM |
2402 | struct esp_target_data *tp = &esp->target[dev->id]; |
2403 | int goal_tags, queue_depth; | |
2404 | ||
2405 | goal_tags = 0; | |
2406 | ||
2407 | if (dev->tagged_supported) { | |
2408 | /* XXX make this configurable somehow XXX */ | |
2409 | goal_tags = ESP_DEFAULT_TAGS; | |
2410 | ||
2411 | if (goal_tags > ESP_MAX_TAG) | |
2412 | goal_tags = ESP_MAX_TAG; | |
2413 | } | |
2414 | ||
2415 | queue_depth = goal_tags; | |
2416 | if (queue_depth < dev->host->cmd_per_lun) | |
2417 | queue_depth = dev->host->cmd_per_lun; | |
2418 | ||
2419 | if (goal_tags) { | |
2420 | scsi_set_tag_type(dev, MSG_ORDERED_TAG); | |
2421 | scsi_activate_tcq(dev, queue_depth); | |
2422 | } else { | |
2423 | scsi_deactivate_tcq(dev, queue_depth); | |
2424 | } | |
2425 | tp->flags |= ESP_TGT_DISCONNECT; | |
2426 | ||
2427 | if (!spi_initial_dv(dev->sdev_target)) | |
2428 | spi_dv_device(dev); | |
2429 | ||
2430 | return 0; | |
2431 | } | |
2432 | ||
2433 | static void esp_slave_destroy(struct scsi_device *dev) | |
2434 | { | |
2435 | struct esp_lun_data *lp = dev->hostdata; | |
2436 | ||
2437 | kfree(lp); | |
2438 | dev->hostdata = NULL; | |
2439 | } | |
2440 | ||
2441 | static int esp_eh_abort_handler(struct scsi_cmnd *cmd) | |
2442 | { | |
2b14ec78 | 2443 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2444 | struct esp_cmd_entry *ent, *tmp; |
2445 | struct completion eh_done; | |
2446 | unsigned long flags; | |
2447 | ||
2448 | /* XXX This helps a lot with debugging but might be a bit | |
2449 | * XXX much for the final driver. | |
2450 | */ | |
2451 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2452 | printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n", | |
2453 | esp->host->unique_id, cmd, cmd->cmnd[0]); | |
2454 | ent = esp->active_cmd; | |
2455 | if (ent) | |
2456 | printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n", | |
2457 | esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]); | |
2458 | list_for_each_entry(ent, &esp->queued_cmds, list) { | |
2459 | printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n", | |
2460 | esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]); | |
2461 | } | |
2462 | list_for_each_entry(ent, &esp->active_cmds, list) { | |
2463 | printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n", | |
2464 | esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]); | |
2465 | } | |
2466 | esp_dump_cmd_log(esp); | |
2467 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2468 | ||
2469 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2470 | ||
2471 | ent = NULL; | |
2472 | list_for_each_entry(tmp, &esp->queued_cmds, list) { | |
2473 | if (tmp->cmd == cmd) { | |
2474 | ent = tmp; | |
2475 | break; | |
2476 | } | |
2477 | } | |
2478 | ||
2479 | if (ent) { | |
2480 | /* Easiest case, we didn't even issue the command | |
2481 | * yet so it is trivial to abort. | |
2482 | */ | |
2483 | list_del(&ent->list); | |
2484 | ||
2485 | cmd->result = DID_ABORT << 16; | |
2486 | cmd->scsi_done(cmd); | |
2487 | ||
2488 | esp_put_ent(esp, ent); | |
2489 | ||
2490 | goto out_success; | |
2491 | } | |
2492 | ||
2493 | init_completion(&eh_done); | |
2494 | ||
2495 | ent = esp->active_cmd; | |
2496 | if (ent && ent->cmd == cmd) { | |
2497 | /* Command is the currently active command on | |
2498 | * the bus. If we already have an output message | |
2499 | * pending, no dice. | |
2500 | */ | |
2501 | if (esp->msg_out_len) | |
2502 | goto out_failure; | |
2503 | ||
2504 | /* Send out an abort, encouraging the target to | |
2505 | * go to MSGOUT phase by asserting ATN. | |
2506 | */ | |
2507 | esp->msg_out[0] = ABORT_TASK_SET; | |
2508 | esp->msg_out_len = 1; | |
2509 | ent->eh_done = &eh_done; | |
2510 | ||
2511 | scsi_esp_cmd(esp, ESP_CMD_SATN); | |
2512 | } else { | |
2513 | /* The command is disconnected. This is not easy to | |
2514 | * abort. For now we fail and let the scsi error | |
2515 | * handling layer go try a scsi bus reset or host | |
2516 | * reset. | |
2517 | * | |
2518 | * What we could do is put together a scsi command | |
2519 | * solely for the purpose of sending an abort message | |
2520 | * to the target. Coming up with all the code to | |
2521 | * cook up scsi commands, special case them everywhere, | |
2522 | * etc. is for questionable gain and it would be better | |
2523 | * if the generic scsi error handling layer could do at | |
2524 | * least some of that for us. | |
2525 | * | |
2526 | * Anyways this is an area for potential future improvement | |
2527 | * in this driver. | |
2528 | */ | |
2529 | goto out_failure; | |
2530 | } | |
2531 | ||
2532 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2533 | ||
2534 | if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) { | |
2535 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2536 | ent->eh_done = NULL; | |
2537 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2538 | ||
2539 | return FAILED; | |
2540 | } | |
2541 | ||
2542 | return SUCCESS; | |
2543 | ||
2544 | out_success: | |
2545 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2546 | return SUCCESS; | |
2547 | ||
2548 | out_failure: | |
2549 | /* XXX This might be a good location to set ESP_TGT_BROKEN | |
2550 | * XXX since we know which target/lun in particular is | |
2551 | * XXX causing trouble. | |
2552 | */ | |
2553 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2554 | return FAILED; | |
2555 | } | |
2556 | ||
2557 | static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd) | |
2558 | { | |
2b14ec78 | 2559 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2560 | struct completion eh_reset; |
2561 | unsigned long flags; | |
2562 | ||
2563 | init_completion(&eh_reset); | |
2564 | ||
2565 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2566 | ||
2567 | esp->eh_reset = &eh_reset; | |
2568 | ||
2569 | /* XXX This is too simple... We should add lots of | |
2570 | * XXX checks here so that if we find that the chip is | |
2571 | * XXX very wedged we return failure immediately so | |
2572 | * XXX that we can perform a full chip reset. | |
2573 | */ | |
2574 | esp->flags |= ESP_FLAG_RESETTING; | |
2575 | scsi_esp_cmd(esp, ESP_CMD_RS); | |
2576 | ||
2577 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2578 | ||
2579 | ssleep(esp_bus_reset_settle); | |
2580 | ||
2581 | if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) { | |
2582 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2583 | esp->eh_reset = NULL; | |
2584 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2585 | ||
2586 | return FAILED; | |
2587 | } | |
2588 | ||
2589 | return SUCCESS; | |
2590 | } | |
2591 | ||
2592 | /* All bets are off, reset the entire device. */ | |
2593 | static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
2594 | { | |
2b14ec78 | 2595 | struct esp *esp = shost_priv(cmd->device->host); |
cd9ad58d DM |
2596 | unsigned long flags; |
2597 | ||
2598 | spin_lock_irqsave(esp->host->host_lock, flags); | |
2599 | esp_bootup_reset(esp); | |
2600 | esp_reset_cleanup(esp); | |
2601 | spin_unlock_irqrestore(esp->host->host_lock, flags); | |
2602 | ||
2603 | ssleep(esp_bus_reset_settle); | |
2604 | ||
2605 | return SUCCESS; | |
2606 | } | |
2607 | ||
2608 | static const char *esp_info(struct Scsi_Host *host) | |
2609 | { | |
2610 | return "esp"; | |
2611 | } | |
2612 | ||
2613 | struct scsi_host_template scsi_esp_template = { | |
2614 | .module = THIS_MODULE, | |
2615 | .name = "esp", | |
2616 | .info = esp_info, | |
2617 | .queuecommand = esp_queuecommand, | |
ec5e69f6 JB |
2618 | .target_alloc = esp_target_alloc, |
2619 | .target_destroy = esp_target_destroy, | |
cd9ad58d DM |
2620 | .slave_alloc = esp_slave_alloc, |
2621 | .slave_configure = esp_slave_configure, | |
2622 | .slave_destroy = esp_slave_destroy, | |
2623 | .eh_abort_handler = esp_eh_abort_handler, | |
2624 | .eh_bus_reset_handler = esp_eh_bus_reset_handler, | |
2625 | .eh_host_reset_handler = esp_eh_host_reset_handler, | |
2626 | .can_queue = 7, | |
2627 | .this_id = 7, | |
2628 | .sg_tablesize = SG_ALL, | |
2629 | .use_clustering = ENABLE_CLUSTERING, | |
2630 | .max_sectors = 0xffff, | |
2631 | .skip_settle_delay = 1, | |
2632 | }; | |
2633 | EXPORT_SYMBOL(scsi_esp_template); | |
2634 | ||
2635 | static void esp_get_signalling(struct Scsi_Host *host) | |
2636 | { | |
2b14ec78 | 2637 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2638 | enum spi_signal_type type; |
2639 | ||
2640 | if (esp->flags & ESP_FLAG_DIFFERENTIAL) | |
2641 | type = SPI_SIGNAL_HVD; | |
2642 | else | |
2643 | type = SPI_SIGNAL_SE; | |
2644 | ||
2645 | spi_signalling(host) = type; | |
2646 | } | |
2647 | ||
2648 | static void esp_set_offset(struct scsi_target *target, int offset) | |
2649 | { | |
2650 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2651 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2652 | struct esp_target_data *tp = &esp->target[target->id]; |
2653 | ||
02507a80 FT |
2654 | if (esp->flags & ESP_FLAG_DISABLE_SYNC) |
2655 | tp->nego_goal_offset = 0; | |
2656 | else | |
2657 | tp->nego_goal_offset = offset; | |
cd9ad58d DM |
2658 | tp->flags |= ESP_TGT_CHECK_NEGO; |
2659 | } | |
2660 | ||
2661 | static void esp_set_period(struct scsi_target *target, int period) | |
2662 | { | |
2663 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2664 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2665 | struct esp_target_data *tp = &esp->target[target->id]; |
2666 | ||
2667 | tp->nego_goal_period = period; | |
2668 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2669 | } | |
2670 | ||
2671 | static void esp_set_width(struct scsi_target *target, int width) | |
2672 | { | |
2673 | struct Scsi_Host *host = dev_to_shost(target->dev.parent); | |
2b14ec78 | 2674 | struct esp *esp = shost_priv(host); |
cd9ad58d DM |
2675 | struct esp_target_data *tp = &esp->target[target->id]; |
2676 | ||
2677 | tp->nego_goal_width = (width ? 1 : 0); | |
2678 | tp->flags |= ESP_TGT_CHECK_NEGO; | |
2679 | } | |
2680 | ||
2681 | static struct spi_function_template esp_transport_ops = { | |
2682 | .set_offset = esp_set_offset, | |
2683 | .show_offset = 1, | |
2684 | .set_period = esp_set_period, | |
2685 | .show_period = 1, | |
2686 | .set_width = esp_set_width, | |
2687 | .show_width = 1, | |
2688 | .get_signalling = esp_get_signalling, | |
2689 | }; | |
2690 | ||
2691 | static int __init esp_init(void) | |
2692 | { | |
2693 | BUILD_BUG_ON(sizeof(struct scsi_pointer) < | |
2694 | sizeof(struct esp_cmd_priv)); | |
2695 | ||
2696 | esp_transport_template = spi_attach_transport(&esp_transport_ops); | |
2697 | if (!esp_transport_template) | |
2698 | return -ENODEV; | |
2699 | ||
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | static void __exit esp_exit(void) | |
2704 | { | |
2705 | spi_release_transport(esp_transport_template); | |
2706 | } | |
2707 | ||
2708 | MODULE_DESCRIPTION("ESP SCSI driver core"); | |
2709 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
2710 | MODULE_LICENSE("GPL"); | |
2711 | MODULE_VERSION(DRV_VERSION); | |
2712 | ||
2713 | module_param(esp_bus_reset_settle, int, 0); | |
2714 | MODULE_PARM_DESC(esp_bus_reset_settle, | |
2715 | "ESP scsi bus reset delay in seconds"); | |
2716 | ||
2717 | module_param(esp_debug, int, 0); | |
2718 | MODULE_PARM_DESC(esp_debug, | |
2719 | "ESP bitmapped debugging message enable value:\n" | |
2720 | " 0x00000001 Log interrupt events\n" | |
2721 | " 0x00000002 Log scsi commands\n" | |
2722 | " 0x00000004 Log resets\n" | |
2723 | " 0x00000008 Log message in events\n" | |
2724 | " 0x00000010 Log message out events\n" | |
2725 | " 0x00000020 Log command completion\n" | |
2726 | " 0x00000040 Log disconnects\n" | |
2727 | " 0x00000080 Log data start\n" | |
2728 | " 0x00000100 Log data done\n" | |
2729 | " 0x00000200 Log reconnects\n" | |
2730 | " 0x00000400 Log auto-sense data\n" | |
2731 | ); | |
2732 | ||
2733 | module_init(esp_init); | |
2734 | module_exit(esp_exit); |