Commit | Line | Data |
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8722ff8c | 1 | /* |
2 | * Filename: cregs.c | |
3 | * | |
4 | * | |
5 | * Authors: Joshua Morris <josh.h.morris@us.ibm.com> | |
6 | * Philip Kelleher <pjk1939@linux.vnet.ibm.com> | |
7 | * | |
8 | * (C) Copyright 2013 IBM Corporation | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software Foundation, | |
22 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/completion.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | #include "rsxx_priv.h" | |
29 | ||
30 | #define CREG_TIMEOUT_MSEC 10000 | |
31 | ||
32 | typedef void (*creg_cmd_cb)(struct rsxx_cardinfo *card, | |
33 | struct creg_cmd *cmd, | |
34 | int st); | |
35 | ||
36 | struct creg_cmd { | |
37 | struct list_head list; | |
38 | creg_cmd_cb cb; | |
39 | void *cb_private; | |
40 | unsigned int op; | |
41 | unsigned int addr; | |
42 | int cnt8; | |
43 | void *buf; | |
44 | unsigned int stream; | |
45 | unsigned int status; | |
46 | }; | |
47 | ||
48 | static struct kmem_cache *creg_cmd_pool; | |
49 | ||
50 | ||
51 | /*------------ Private Functions --------------*/ | |
52 | ||
53 | #if defined(__LITTLE_ENDIAN) | |
54 | #define LITTLE_ENDIAN 1 | |
55 | #elif defined(__BIG_ENDIAN) | |
56 | #define LITTLE_ENDIAN 0 | |
57 | #else | |
58 | #error Unknown endianess!!! Aborting... | |
59 | #endif | |
60 | ||
c95246c3 | 61 | static int copy_to_creg_data(struct rsxx_cardinfo *card, |
8722ff8c | 62 | int cnt8, |
63 | void *buf, | |
64 | unsigned int stream) | |
65 | { | |
66 | int i = 0; | |
67 | u32 *data = buf; | |
68 | ||
c95246c3 PK |
69 | if (unlikely(card->eeh_state)) |
70 | return -EIO; | |
71 | ||
8722ff8c | 72 | for (i = 0; cnt8 > 0; i++, cnt8 -= 4) { |
73 | /* | |
74 | * Firmware implementation makes it necessary to byte swap on | |
75 | * little endian processors. | |
76 | */ | |
77 | if (LITTLE_ENDIAN && stream) | |
78 | iowrite32be(data[i], card->regmap + CREG_DATA(i)); | |
79 | else | |
80 | iowrite32(data[i], card->regmap + CREG_DATA(i)); | |
81 | } | |
c95246c3 PK |
82 | |
83 | return 0; | |
8722ff8c | 84 | } |
85 | ||
86 | ||
c95246c3 | 87 | static int copy_from_creg_data(struct rsxx_cardinfo *card, |
8722ff8c | 88 | int cnt8, |
89 | void *buf, | |
90 | unsigned int stream) | |
91 | { | |
92 | int i = 0; | |
93 | u32 *data = buf; | |
94 | ||
c95246c3 PK |
95 | if (unlikely(card->eeh_state)) |
96 | return -EIO; | |
97 | ||
8722ff8c | 98 | for (i = 0; cnt8 > 0; i++, cnt8 -= 4) { |
99 | /* | |
100 | * Firmware implementation makes it necessary to byte swap on | |
101 | * little endian processors. | |
102 | */ | |
103 | if (LITTLE_ENDIAN && stream) | |
104 | data[i] = ioread32be(card->regmap + CREG_DATA(i)); | |
105 | else | |
106 | data[i] = ioread32(card->regmap + CREG_DATA(i)); | |
107 | } | |
c95246c3 PK |
108 | |
109 | return 0; | |
8722ff8c | 110 | } |
111 | ||
8722ff8c | 112 | static void creg_issue_cmd(struct rsxx_cardinfo *card, struct creg_cmd *cmd) |
113 | { | |
c95246c3 PK |
114 | int st; |
115 | ||
116 | if (unlikely(card->eeh_state)) | |
117 | return; | |
118 | ||
8722ff8c | 119 | iowrite32(cmd->addr, card->regmap + CREG_ADD); |
120 | iowrite32(cmd->cnt8, card->regmap + CREG_CNT); | |
121 | ||
122 | if (cmd->op == CREG_OP_WRITE) { | |
c95246c3 PK |
123 | if (cmd->buf) { |
124 | st = copy_to_creg_data(card, cmd->cnt8, | |
125 | cmd->buf, cmd->stream); | |
126 | if (st) | |
127 | return; | |
128 | } | |
8722ff8c | 129 | } |
130 | ||
c95246c3 PK |
131 | if (unlikely(card->eeh_state)) |
132 | return; | |
133 | ||
8722ff8c | 134 | /* Setting the valid bit will kick off the command. */ |
135 | iowrite32(cmd->op, card->regmap + CREG_CMD); | |
136 | } | |
137 | ||
138 | static void creg_kick_queue(struct rsxx_cardinfo *card) | |
139 | { | |
140 | if (card->creg_ctrl.active || list_empty(&card->creg_ctrl.queue)) | |
141 | return; | |
142 | ||
143 | card->creg_ctrl.active = 1; | |
144 | card->creg_ctrl.active_cmd = list_first_entry(&card->creg_ctrl.queue, | |
145 | struct creg_cmd, list); | |
146 | list_del(&card->creg_ctrl.active_cmd->list); | |
147 | card->creg_ctrl.q_depth--; | |
148 | ||
149 | /* | |
150 | * We have to set the timer before we push the new command. Otherwise, | |
151 | * we could create a race condition that would occur if the timer | |
152 | * was not canceled, and expired after the new command was pushed, | |
153 | * but before the command was issued to hardware. | |
154 | */ | |
155 | mod_timer(&card->creg_ctrl.cmd_timer, | |
156 | jiffies + msecs_to_jiffies(CREG_TIMEOUT_MSEC)); | |
157 | ||
158 | creg_issue_cmd(card, card->creg_ctrl.active_cmd); | |
159 | } | |
160 | ||
161 | static int creg_queue_cmd(struct rsxx_cardinfo *card, | |
162 | unsigned int op, | |
163 | unsigned int addr, | |
164 | unsigned int cnt8, | |
165 | void *buf, | |
166 | int stream, | |
167 | creg_cmd_cb callback, | |
168 | void *cb_private) | |
169 | { | |
170 | struct creg_cmd *cmd; | |
171 | ||
172 | /* Don't queue stuff up if we're halted. */ | |
173 | if (unlikely(card->halt)) | |
174 | return -EINVAL; | |
175 | ||
176 | if (card->creg_ctrl.reset) | |
177 | return -EAGAIN; | |
178 | ||
179 | if (cnt8 > MAX_CREG_DATA8) | |
180 | return -EINVAL; | |
181 | ||
182 | cmd = kmem_cache_alloc(creg_cmd_pool, GFP_KERNEL); | |
183 | if (!cmd) | |
184 | return -ENOMEM; | |
185 | ||
186 | INIT_LIST_HEAD(&cmd->list); | |
187 | ||
188 | cmd->op = op; | |
189 | cmd->addr = addr; | |
190 | cmd->cnt8 = cnt8; | |
191 | cmd->buf = buf; | |
192 | cmd->stream = stream; | |
193 | cmd->cb = callback; | |
194 | cmd->cb_private = cb_private; | |
195 | cmd->status = 0; | |
196 | ||
03ac03a8 | 197 | spin_lock_bh(&card->creg_ctrl.lock); |
8722ff8c | 198 | list_add_tail(&cmd->list, &card->creg_ctrl.queue); |
199 | card->creg_ctrl.q_depth++; | |
200 | creg_kick_queue(card); | |
03ac03a8 | 201 | spin_unlock_bh(&card->creg_ctrl.lock); |
8722ff8c | 202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static void creg_cmd_timed_out(unsigned long data) | |
207 | { | |
208 | struct rsxx_cardinfo *card = (struct rsxx_cardinfo *) data; | |
209 | struct creg_cmd *cmd; | |
210 | ||
03ac03a8 PK |
211 | spin_lock(&card->creg_ctrl.lock); |
212 | cmd = card->creg_ctrl.active_cmd; | |
213 | card->creg_ctrl.active_cmd = NULL; | |
214 | spin_unlock(&card->creg_ctrl.lock); | |
215 | ||
8722ff8c | 216 | if (cmd == NULL) { |
217 | card->creg_ctrl.creg_stats.creg_timeout++; | |
218 | dev_warn(CARD_TO_DEV(card), | |
219 | "No active command associated with timeout!\n"); | |
220 | return; | |
221 | } | |
222 | ||
223 | if (cmd->cb) | |
224 | cmd->cb(card, cmd, -ETIMEDOUT); | |
225 | ||
226 | kmem_cache_free(creg_cmd_pool, cmd); | |
227 | ||
c206c709 PK |
228 | |
229 | spin_lock(&card->creg_ctrl.lock); | |
8722ff8c | 230 | card->creg_ctrl.active = 0; |
231 | creg_kick_queue(card); | |
c206c709 | 232 | spin_unlock(&card->creg_ctrl.lock); |
8722ff8c | 233 | } |
234 | ||
235 | ||
236 | static void creg_cmd_done(struct work_struct *work) | |
237 | { | |
238 | struct rsxx_cardinfo *card; | |
239 | struct creg_cmd *cmd; | |
240 | int st = 0; | |
241 | ||
242 | card = container_of(work, struct rsxx_cardinfo, | |
243 | creg_ctrl.done_work); | |
244 | ||
245 | /* | |
246 | * The timer could not be cancelled for some reason, | |
247 | * race to pop the active command. | |
248 | */ | |
249 | if (del_timer_sync(&card->creg_ctrl.cmd_timer) == 0) | |
250 | card->creg_ctrl.creg_stats.failed_cancel_timer++; | |
251 | ||
03ac03a8 PK |
252 | spin_lock_bh(&card->creg_ctrl.lock); |
253 | cmd = card->creg_ctrl.active_cmd; | |
254 | card->creg_ctrl.active_cmd = NULL; | |
255 | spin_unlock_bh(&card->creg_ctrl.lock); | |
256 | ||
8722ff8c | 257 | if (cmd == NULL) { |
258 | dev_err(CARD_TO_DEV(card), | |
259 | "Spurious creg interrupt!\n"); | |
260 | return; | |
261 | } | |
262 | ||
263 | card->creg_ctrl.creg_stats.stat = ioread32(card->regmap + CREG_STAT); | |
264 | cmd->status = card->creg_ctrl.creg_stats.stat; | |
265 | if ((cmd->status & CREG_STAT_STATUS_MASK) == 0) { | |
266 | dev_err(CARD_TO_DEV(card), | |
267 | "Invalid status on creg command\n"); | |
268 | /* | |
269 | * At this point we're probably reading garbage from HW. Don't | |
270 | * do anything else that could mess up the system and let | |
271 | * the sync function return an error. | |
272 | */ | |
273 | st = -EIO; | |
274 | goto creg_done; | |
275 | } else if (cmd->status & CREG_STAT_ERROR) { | |
276 | st = -EIO; | |
277 | } | |
278 | ||
279 | if ((cmd->op == CREG_OP_READ)) { | |
280 | unsigned int cnt8 = ioread32(card->regmap + CREG_CNT); | |
281 | ||
282 | /* Paranoid Sanity Checks */ | |
283 | if (!cmd->buf) { | |
284 | dev_err(CARD_TO_DEV(card), | |
285 | "Buffer not given for read.\n"); | |
286 | st = -EIO; | |
287 | goto creg_done; | |
288 | } | |
289 | if (cnt8 != cmd->cnt8) { | |
290 | dev_err(CARD_TO_DEV(card), | |
291 | "count mismatch\n"); | |
292 | st = -EIO; | |
293 | goto creg_done; | |
294 | } | |
295 | ||
c95246c3 | 296 | st = copy_from_creg_data(card, cnt8, cmd->buf, cmd->stream); |
8722ff8c | 297 | } |
298 | ||
299 | creg_done: | |
300 | if (cmd->cb) | |
301 | cmd->cb(card, cmd, st); | |
302 | ||
303 | kmem_cache_free(creg_cmd_pool, cmd); | |
304 | ||
03ac03a8 | 305 | spin_lock_bh(&card->creg_ctrl.lock); |
8722ff8c | 306 | card->creg_ctrl.active = 0; |
307 | creg_kick_queue(card); | |
03ac03a8 | 308 | spin_unlock_bh(&card->creg_ctrl.lock); |
8722ff8c | 309 | } |
310 | ||
311 | static void creg_reset(struct rsxx_cardinfo *card) | |
312 | { | |
313 | struct creg_cmd *cmd = NULL; | |
314 | struct creg_cmd *tmp; | |
315 | unsigned long flags; | |
316 | ||
c206c709 PK |
317 | /* |
318 | * mutex_trylock is used here because if reset_lock is taken then a | |
319 | * reset is already happening. So, we can just go ahead and return. | |
320 | */ | |
8722ff8c | 321 | if (!mutex_trylock(&card->creg_ctrl.reset_lock)) |
322 | return; | |
323 | ||
324 | card->creg_ctrl.reset = 1; | |
325 | spin_lock_irqsave(&card->irq_lock, flags); | |
326 | rsxx_disable_ier_and_isr(card, CR_INTR_CREG | CR_INTR_EVENT); | |
327 | spin_unlock_irqrestore(&card->irq_lock, flags); | |
328 | ||
329 | dev_warn(CARD_TO_DEV(card), | |
330 | "Resetting creg interface for recovery\n"); | |
331 | ||
332 | /* Cancel outstanding commands */ | |
03ac03a8 | 333 | spin_lock_bh(&card->creg_ctrl.lock); |
8722ff8c | 334 | list_for_each_entry_safe(cmd, tmp, &card->creg_ctrl.queue, list) { |
335 | list_del(&cmd->list); | |
336 | card->creg_ctrl.q_depth--; | |
337 | if (cmd->cb) | |
338 | cmd->cb(card, cmd, -ECANCELED); | |
339 | kmem_cache_free(creg_cmd_pool, cmd); | |
340 | } | |
341 | ||
342 | cmd = card->creg_ctrl.active_cmd; | |
343 | card->creg_ctrl.active_cmd = NULL; | |
344 | if (cmd) { | |
345 | if (timer_pending(&card->creg_ctrl.cmd_timer)) | |
346 | del_timer_sync(&card->creg_ctrl.cmd_timer); | |
347 | ||
348 | if (cmd->cb) | |
349 | cmd->cb(card, cmd, -ECANCELED); | |
350 | kmem_cache_free(creg_cmd_pool, cmd); | |
351 | ||
352 | card->creg_ctrl.active = 0; | |
353 | } | |
03ac03a8 | 354 | spin_unlock_bh(&card->creg_ctrl.lock); |
8722ff8c | 355 | |
356 | card->creg_ctrl.reset = 0; | |
357 | spin_lock_irqsave(&card->irq_lock, flags); | |
358 | rsxx_enable_ier_and_isr(card, CR_INTR_CREG | CR_INTR_EVENT); | |
359 | spin_unlock_irqrestore(&card->irq_lock, flags); | |
360 | ||
361 | mutex_unlock(&card->creg_ctrl.reset_lock); | |
362 | } | |
363 | ||
364 | /* Used for synchronous accesses */ | |
365 | struct creg_completion { | |
366 | struct completion *cmd_done; | |
367 | int st; | |
368 | u32 creg_status; | |
369 | }; | |
370 | ||
371 | static void creg_cmd_done_cb(struct rsxx_cardinfo *card, | |
372 | struct creg_cmd *cmd, | |
373 | int st) | |
374 | { | |
375 | struct creg_completion *cmd_completion; | |
376 | ||
c206c709 | 377 | cmd_completion = cmd->cb_private; |
8722ff8c | 378 | BUG_ON(!cmd_completion); |
379 | ||
380 | cmd_completion->st = st; | |
381 | cmd_completion->creg_status = cmd->status; | |
382 | complete(cmd_completion->cmd_done); | |
383 | } | |
384 | ||
385 | static int __issue_creg_rw(struct rsxx_cardinfo *card, | |
386 | unsigned int op, | |
387 | unsigned int addr, | |
388 | unsigned int cnt8, | |
389 | void *buf, | |
390 | int stream, | |
391 | unsigned int *hw_stat) | |
392 | { | |
393 | DECLARE_COMPLETION_ONSTACK(cmd_done); | |
394 | struct creg_completion completion; | |
395 | unsigned long timeout; | |
396 | int st; | |
397 | ||
8722ff8c | 398 | completion.cmd_done = &cmd_done; |
399 | completion.st = 0; | |
400 | completion.creg_status = 0; | |
401 | ||
402 | st = creg_queue_cmd(card, op, addr, cnt8, buf, stream, creg_cmd_done_cb, | |
403 | &completion); | |
404 | if (st) | |
405 | return st; | |
406 | ||
c206c709 | 407 | /* |
f3791203 | 408 | * This timeout is necessary for unresponsive hardware. The additional |
c206c709 PK |
409 | * 20 seconds to used to guarantee that each cregs requests has time to |
410 | * complete. | |
411 | */ | |
f3791203 PK |
412 | timeout = msecs_to_jiffies(CREG_TIMEOUT_MSEC * |
413 | card->creg_ctrl.q_depth + 20000); | |
8722ff8c | 414 | |
415 | /* | |
416 | * The creg interface is guaranteed to complete. It has a timeout | |
417 | * mechanism that will kick in if hardware does not respond. | |
418 | */ | |
419 | st = wait_for_completion_timeout(completion.cmd_done, timeout); | |
420 | if (st == 0) { | |
421 | /* | |
422 | * This is really bad, because the kernel timer did not | |
423 | * expire and notify us of a timeout! | |
424 | */ | |
425 | dev_crit(CARD_TO_DEV(card), | |
426 | "cregs timer failed\n"); | |
427 | creg_reset(card); | |
428 | return -EIO; | |
429 | } | |
430 | ||
431 | *hw_stat = completion.creg_status; | |
432 | ||
433 | if (completion.st) { | |
b8b225da PK |
434 | /* |
435 | * This read is needed to verify that there has not been any | |
436 | * extreme errors that might have occurred, i.e. EEH. The | |
437 | * function iowrite32 will not detect EEH errors, so it is | |
438 | * necessary that we recover if such an error is the reason | |
439 | * for the timeout. This is a dummy read. | |
440 | */ | |
441 | ioread32(card->regmap + SCRATCH); | |
442 | ||
8722ff8c | 443 | dev_warn(CARD_TO_DEV(card), |
444 | "creg command failed(%d x%08x)\n", | |
445 | completion.st, addr); | |
446 | return completion.st; | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static int issue_creg_rw(struct rsxx_cardinfo *card, | |
453 | u32 addr, | |
454 | unsigned int size8, | |
455 | void *data, | |
456 | int stream, | |
457 | int read) | |
458 | { | |
459 | unsigned int hw_stat; | |
460 | unsigned int xfer; | |
461 | unsigned int op; | |
462 | int st; | |
463 | ||
464 | op = read ? CREG_OP_READ : CREG_OP_WRITE; | |
465 | ||
466 | do { | |
467 | xfer = min_t(unsigned int, size8, MAX_CREG_DATA8); | |
468 | ||
469 | st = __issue_creg_rw(card, op, addr, xfer, | |
470 | data, stream, &hw_stat); | |
471 | if (st) | |
472 | return st; | |
473 | ||
c206c709 | 474 | data = (char *)data + xfer; |
8722ff8c | 475 | addr += xfer; |
476 | size8 -= xfer; | |
477 | } while (size8); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | /* ---------------------------- Public API ---------------------------------- */ | |
483 | int rsxx_creg_write(struct rsxx_cardinfo *card, | |
484 | u32 addr, | |
485 | unsigned int size8, | |
486 | void *data, | |
487 | int byte_stream) | |
488 | { | |
489 | return issue_creg_rw(card, addr, size8, data, byte_stream, 0); | |
490 | } | |
491 | ||
492 | int rsxx_creg_read(struct rsxx_cardinfo *card, | |
493 | u32 addr, | |
494 | unsigned int size8, | |
495 | void *data, | |
496 | int byte_stream) | |
497 | { | |
498 | return issue_creg_rw(card, addr, size8, data, byte_stream, 1); | |
499 | } | |
500 | ||
501 | int rsxx_get_card_state(struct rsxx_cardinfo *card, unsigned int *state) | |
502 | { | |
503 | return rsxx_creg_read(card, CREG_ADD_CARD_STATE, | |
504 | sizeof(*state), state, 0); | |
505 | } | |
506 | ||
507 | int rsxx_get_card_size8(struct rsxx_cardinfo *card, u64 *size8) | |
508 | { | |
509 | unsigned int size; | |
510 | int st; | |
511 | ||
512 | st = rsxx_creg_read(card, CREG_ADD_CARD_SIZE, | |
513 | sizeof(size), &size, 0); | |
514 | if (st) | |
515 | return st; | |
516 | ||
517 | *size8 = (u64)size * RSXX_HW_BLK_SIZE; | |
518 | return 0; | |
519 | } | |
520 | ||
521 | int rsxx_get_num_targets(struct rsxx_cardinfo *card, | |
522 | unsigned int *n_targets) | |
523 | { | |
524 | return rsxx_creg_read(card, CREG_ADD_NUM_TARGETS, | |
525 | sizeof(*n_targets), n_targets, 0); | |
526 | } | |
527 | ||
528 | int rsxx_get_card_capabilities(struct rsxx_cardinfo *card, | |
529 | u32 *capabilities) | |
530 | { | |
531 | return rsxx_creg_read(card, CREG_ADD_CAPABILITIES, | |
532 | sizeof(*capabilities), capabilities, 0); | |
533 | } | |
534 | ||
535 | int rsxx_issue_card_cmd(struct rsxx_cardinfo *card, u32 cmd) | |
536 | { | |
537 | return rsxx_creg_write(card, CREG_ADD_CARD_CMD, | |
538 | sizeof(cmd), &cmd, 0); | |
539 | } | |
540 | ||
541 | ||
542 | /*----------------- HW Log Functions -------------------*/ | |
543 | static void hw_log_msg(struct rsxx_cardinfo *card, const char *str, int len) | |
544 | { | |
545 | static char level; | |
546 | ||
547 | /* | |
548 | * New messages start with "<#>", where # is the log level. Messages | |
549 | * that extend past the log buffer will use the previous level | |
550 | */ | |
551 | if ((len > 3) && (str[0] == '<') && (str[2] == '>')) { | |
552 | level = str[1]; | |
553 | str += 3; /* Skip past the log level. */ | |
554 | len -= 3; | |
555 | } | |
556 | ||
557 | switch (level) { | |
558 | case '0': | |
559 | dev_emerg(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
560 | break; | |
561 | case '1': | |
562 | dev_alert(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
563 | break; | |
564 | case '2': | |
565 | dev_crit(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
566 | break; | |
567 | case '3': | |
568 | dev_err(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
569 | break; | |
570 | case '4': | |
571 | dev_warn(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
572 | break; | |
573 | case '5': | |
574 | dev_notice(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
575 | break; | |
576 | case '6': | |
577 | dev_info(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
578 | break; | |
579 | case '7': | |
580 | dev_dbg(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
581 | break; | |
582 | default: | |
583 | dev_info(CARD_TO_DEV(card), "HW: %.*s", len, str); | |
584 | break; | |
585 | } | |
586 | } | |
587 | ||
588 | /* | |
c206c709 PK |
589 | * The substrncpy function copies the src string (which includes the |
590 | * terminating '\0' character), up to the count into the dest pointer. | |
591 | * Returns the number of bytes copied to dest. | |
8722ff8c | 592 | */ |
593 | static int substrncpy(char *dest, const char *src, int count) | |
594 | { | |
595 | int max_cnt = count; | |
596 | ||
597 | while (count) { | |
598 | count--; | |
599 | *dest = *src; | |
600 | if (*dest == '\0') | |
601 | break; | |
602 | src++; | |
603 | dest++; | |
604 | } | |
605 | return max_cnt - count; | |
606 | } | |
607 | ||
608 | ||
609 | static void read_hw_log_done(struct rsxx_cardinfo *card, | |
610 | struct creg_cmd *cmd, | |
611 | int st) | |
612 | { | |
613 | char *buf; | |
614 | char *log_str; | |
615 | int cnt; | |
616 | int len; | |
617 | int off; | |
618 | ||
619 | buf = cmd->buf; | |
620 | off = 0; | |
621 | ||
622 | /* Failed getting the log message */ | |
623 | if (st) | |
624 | return; | |
625 | ||
626 | while (off < cmd->cnt8) { | |
627 | log_str = &card->log.buf[card->log.buf_len]; | |
628 | cnt = min(cmd->cnt8 - off, LOG_BUF_SIZE8 - card->log.buf_len); | |
629 | len = substrncpy(log_str, &buf[off], cnt); | |
630 | ||
631 | off += len; | |
632 | card->log.buf_len += len; | |
633 | ||
634 | /* | |
635 | * Flush the log if we've hit the end of a message or if we've | |
636 | * run out of buffer space. | |
637 | */ | |
638 | if ((log_str[len - 1] == '\0') || | |
639 | (card->log.buf_len == LOG_BUF_SIZE8)) { | |
640 | if (card->log.buf_len != 1) /* Don't log blank lines. */ | |
641 | hw_log_msg(card, card->log.buf, | |
642 | card->log.buf_len); | |
643 | card->log.buf_len = 0; | |
644 | } | |
645 | ||
646 | } | |
647 | ||
648 | if (cmd->status & CREG_STAT_LOG_PENDING) | |
649 | rsxx_read_hw_log(card); | |
650 | } | |
651 | ||
652 | int rsxx_read_hw_log(struct rsxx_cardinfo *card) | |
653 | { | |
654 | int st; | |
655 | ||
656 | st = creg_queue_cmd(card, CREG_OP_READ, CREG_ADD_LOG, | |
657 | sizeof(card->log.tmp), card->log.tmp, | |
658 | 1, read_hw_log_done, NULL); | |
659 | if (st) | |
660 | dev_err(CARD_TO_DEV(card), | |
661 | "Failed getting log text\n"); | |
662 | ||
663 | return st; | |
664 | } | |
665 | ||
666 | /*-------------- IOCTL REG Access ------------------*/ | |
667 | static int issue_reg_cmd(struct rsxx_cardinfo *card, | |
668 | struct rsxx_reg_access *cmd, | |
669 | int read) | |
670 | { | |
671 | unsigned int op = read ? CREG_OP_READ : CREG_OP_WRITE; | |
672 | ||
673 | return __issue_creg_rw(card, op, cmd->addr, cmd->cnt, cmd->data, | |
674 | cmd->stream, &cmd->stat); | |
675 | } | |
676 | ||
677 | int rsxx_reg_access(struct rsxx_cardinfo *card, | |
678 | struct rsxx_reg_access __user *ucmd, | |
679 | int read) | |
680 | { | |
681 | struct rsxx_reg_access cmd; | |
682 | int st; | |
683 | ||
684 | st = copy_from_user(&cmd, ucmd, sizeof(cmd)); | |
685 | if (st) | |
686 | return -EFAULT; | |
687 | ||
c206c709 PK |
688 | if (cmd.cnt > RSXX_MAX_REG_CNT) |
689 | return -EFAULT; | |
690 | ||
8722ff8c | 691 | st = issue_reg_cmd(card, &cmd, read); |
692 | if (st) | |
693 | return st; | |
694 | ||
695 | st = put_user(cmd.stat, &ucmd->stat); | |
696 | if (st) | |
697 | return -EFAULT; | |
698 | ||
699 | if (read) { | |
700 | st = copy_to_user(ucmd->data, cmd.data, cmd.cnt); | |
701 | if (st) | |
702 | return -EFAULT; | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
c95246c3 PK |
708 | void rsxx_eeh_save_issued_creg(struct rsxx_cardinfo *card) |
709 | { | |
710 | struct creg_cmd *cmd = NULL; | |
711 | ||
712 | cmd = card->creg_ctrl.active_cmd; | |
713 | card->creg_ctrl.active_cmd = NULL; | |
714 | ||
715 | if (cmd) { | |
716 | del_timer_sync(&card->creg_ctrl.cmd_timer); | |
717 | ||
718 | spin_lock_bh(&card->creg_ctrl.lock); | |
719 | list_add(&cmd->list, &card->creg_ctrl.queue); | |
720 | card->creg_ctrl.q_depth++; | |
721 | card->creg_ctrl.active = 0; | |
722 | spin_unlock_bh(&card->creg_ctrl.lock); | |
723 | } | |
724 | } | |
725 | ||
726 | void rsxx_kick_creg_queue(struct rsxx_cardinfo *card) | |
727 | { | |
728 | spin_lock_bh(&card->creg_ctrl.lock); | |
729 | if (!list_empty(&card->creg_ctrl.queue)) | |
730 | creg_kick_queue(card); | |
731 | spin_unlock_bh(&card->creg_ctrl.lock); | |
732 | } | |
733 | ||
8722ff8c | 734 | /*------------ Initialization & Setup --------------*/ |
735 | int rsxx_creg_setup(struct rsxx_cardinfo *card) | |
736 | { | |
737 | card->creg_ctrl.active_cmd = NULL; | |
738 | ||
a3299ab1 PK |
739 | card->creg_ctrl.creg_wq = |
740 | create_singlethread_workqueue(DRIVER_NAME"_creg"); | |
741 | if (!card->creg_ctrl.creg_wq) | |
742 | return -ENOMEM; | |
743 | ||
8722ff8c | 744 | INIT_WORK(&card->creg_ctrl.done_work, creg_cmd_done); |
745 | mutex_init(&card->creg_ctrl.reset_lock); | |
746 | INIT_LIST_HEAD(&card->creg_ctrl.queue); | |
c206c709 | 747 | spin_lock_init(&card->creg_ctrl.lock); |
8722ff8c | 748 | setup_timer(&card->creg_ctrl.cmd_timer, creg_cmd_timed_out, |
749 | (unsigned long) card); | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
754 | void rsxx_creg_destroy(struct rsxx_cardinfo *card) | |
755 | { | |
756 | struct creg_cmd *cmd; | |
757 | struct creg_cmd *tmp; | |
758 | int cnt = 0; | |
759 | ||
760 | /* Cancel outstanding commands */ | |
03ac03a8 | 761 | spin_lock_bh(&card->creg_ctrl.lock); |
8722ff8c | 762 | list_for_each_entry_safe(cmd, tmp, &card->creg_ctrl.queue, list) { |
763 | list_del(&cmd->list); | |
764 | if (cmd->cb) | |
765 | cmd->cb(card, cmd, -ECANCELED); | |
766 | kmem_cache_free(creg_cmd_pool, cmd); | |
767 | cnt++; | |
768 | } | |
769 | ||
770 | if (cnt) | |
771 | dev_info(CARD_TO_DEV(card), | |
772 | "Canceled %d queue creg commands\n", cnt); | |
773 | ||
774 | cmd = card->creg_ctrl.active_cmd; | |
775 | card->creg_ctrl.active_cmd = NULL; | |
776 | if (cmd) { | |
777 | if (timer_pending(&card->creg_ctrl.cmd_timer)) | |
778 | del_timer_sync(&card->creg_ctrl.cmd_timer); | |
779 | ||
780 | if (cmd->cb) | |
781 | cmd->cb(card, cmd, -ECANCELED); | |
782 | dev_info(CARD_TO_DEV(card), | |
783 | "Canceled active creg command\n"); | |
784 | kmem_cache_free(creg_cmd_pool, cmd); | |
785 | } | |
03ac03a8 | 786 | spin_unlock_bh(&card->creg_ctrl.lock); |
8722ff8c | 787 | |
788 | cancel_work_sync(&card->creg_ctrl.done_work); | |
789 | } | |
790 | ||
791 | ||
792 | int rsxx_creg_init(void) | |
793 | { | |
794 | creg_cmd_pool = KMEM_CACHE(creg_cmd, SLAB_HWCACHE_ALIGN); | |
795 | if (!creg_cmd_pool) | |
796 | return -ENOMEM; | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | void rsxx_creg_cleanup(void) | |
802 | { | |
803 | kmem_cache_destroy(creg_cmd_pool); | |
804 | } |