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1 | /* | |
2 | * linux/drivers/mmc/core/core.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. | |
6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. | |
7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/leds.h> | |
22 | #include <linux/scatterlist.h> | |
23 | #include <linux/log2.h> | |
24 | #include <linux/regulator/consumer.h> | |
25 | ||
26 | #include <linux/mmc/card.h> | |
27 | #include <linux/mmc/host.h> | |
28 | #include <linux/mmc/mmc.h> | |
29 | #include <linux/mmc/sd.h> | |
30 | ||
31 | #include "core.h" | |
32 | #include "bus.h" | |
33 | #include "host.h" | |
34 | #include "sdio_bus.h" | |
35 | ||
36 | #include "mmc_ops.h" | |
37 | #include "sd_ops.h" | |
38 | #include "sdio_ops.h" | |
39 | ||
40 | static struct workqueue_struct *workqueue; | |
41 | ||
42 | /* | |
43 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
44 | * performance cost, and for other reasons may not always be desired. | |
45 | * So we allow it it to be disabled. | |
46 | */ | |
47 | int use_spi_crc = 1; | |
48 | module_param(use_spi_crc, bool, 0); | |
49 | ||
50 | /* | |
51 | * We normally treat cards as removed during suspend if they are not | |
52 | * known to be on a non-removable bus, to avoid the risk of writing | |
53 | * back data to a different card after resume. Allow this to be | |
54 | * overridden if necessary. | |
55 | */ | |
56 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
57 | int mmc_assume_removable; | |
58 | #else | |
59 | int mmc_assume_removable = 1; | |
60 | #endif | |
61 | module_param_named(removable, mmc_assume_removable, bool, 0644); | |
62 | MODULE_PARM_DESC( | |
63 | removable, | |
64 | "MMC/SD cards are removable and may be removed during suspend"); | |
65 | ||
66 | /* | |
67 | * Internal function. Schedule delayed work in the MMC work queue. | |
68 | */ | |
69 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
70 | unsigned long delay) | |
71 | { | |
72 | return queue_delayed_work(workqueue, work, delay); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Internal function. Flush all scheduled work from the MMC work queue. | |
77 | */ | |
78 | static void mmc_flush_scheduled_work(void) | |
79 | { | |
80 | flush_workqueue(workqueue); | |
81 | } | |
82 | ||
83 | /** | |
84 | * mmc_request_done - finish processing an MMC request | |
85 | * @host: MMC host which completed request | |
86 | * @mrq: MMC request which request | |
87 | * | |
88 | * MMC drivers should call this function when they have completed | |
89 | * their processing of a request. | |
90 | */ | |
91 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
92 | { | |
93 | struct mmc_command *cmd = mrq->cmd; | |
94 | int err = cmd->error; | |
95 | ||
96 | if (err && cmd->retries && mmc_host_is_spi(host)) { | |
97 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
98 | cmd->retries = 0; | |
99 | } | |
100 | ||
101 | if (err && cmd->retries) { | |
102 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
103 | mmc_hostname(host), cmd->opcode, err); | |
104 | ||
105 | cmd->retries--; | |
106 | cmd->error = 0; | |
107 | host->ops->request(host, mrq); | |
108 | } else { | |
109 | led_trigger_event(host->led, LED_OFF); | |
110 | ||
111 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", | |
112 | mmc_hostname(host), cmd->opcode, err, | |
113 | cmd->resp[0], cmd->resp[1], | |
114 | cmd->resp[2], cmd->resp[3]); | |
115 | ||
116 | if (mrq->data) { | |
117 | pr_debug("%s: %d bytes transferred: %d\n", | |
118 | mmc_hostname(host), | |
119 | mrq->data->bytes_xfered, mrq->data->error); | |
120 | } | |
121 | ||
122 | if (mrq->stop) { | |
123 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
124 | mmc_hostname(host), mrq->stop->opcode, | |
125 | mrq->stop->error, | |
126 | mrq->stop->resp[0], mrq->stop->resp[1], | |
127 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
128 | } | |
129 | ||
130 | if (mrq->done) | |
131 | mrq->done(mrq); | |
132 | } | |
133 | } | |
134 | ||
135 | EXPORT_SYMBOL(mmc_request_done); | |
136 | ||
137 | static void | |
138 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
139 | { | |
140 | #ifdef CONFIG_MMC_DEBUG | |
141 | unsigned int i, sz; | |
142 | struct scatterlist *sg; | |
143 | #endif | |
144 | ||
145 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", | |
146 | mmc_hostname(host), mrq->cmd->opcode, | |
147 | mrq->cmd->arg, mrq->cmd->flags); | |
148 | ||
149 | if (mrq->data) { | |
150 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
151 | "tsac %d ms nsac %d\n", | |
152 | mmc_hostname(host), mrq->data->blksz, | |
153 | mrq->data->blocks, mrq->data->flags, | |
154 | mrq->data->timeout_ns / 1000000, | |
155 | mrq->data->timeout_clks); | |
156 | } | |
157 | ||
158 | if (mrq->stop) { | |
159 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
160 | mmc_hostname(host), mrq->stop->opcode, | |
161 | mrq->stop->arg, mrq->stop->flags); | |
162 | } | |
163 | ||
164 | WARN_ON(!host->claimed); | |
165 | ||
166 | led_trigger_event(host->led, LED_FULL); | |
167 | ||
168 | mrq->cmd->error = 0; | |
169 | mrq->cmd->mrq = mrq; | |
170 | if (mrq->data) { | |
171 | BUG_ON(mrq->data->blksz > host->max_blk_size); | |
172 | BUG_ON(mrq->data->blocks > host->max_blk_count); | |
173 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
174 | host->max_req_size); | |
175 | ||
176 | #ifdef CONFIG_MMC_DEBUG | |
177 | sz = 0; | |
178 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) | |
179 | sz += sg->length; | |
180 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); | |
181 | #endif | |
182 | ||
183 | mrq->cmd->data = mrq->data; | |
184 | mrq->data->error = 0; | |
185 | mrq->data->mrq = mrq; | |
186 | if (mrq->stop) { | |
187 | mrq->data->stop = mrq->stop; | |
188 | mrq->stop->error = 0; | |
189 | mrq->stop->mrq = mrq; | |
190 | } | |
191 | } | |
192 | host->ops->request(host, mrq); | |
193 | } | |
194 | ||
195 | static void mmc_wait_done(struct mmc_request *mrq) | |
196 | { | |
197 | complete(mrq->done_data); | |
198 | } | |
199 | ||
200 | /** | |
201 | * mmc_wait_for_req - start a request and wait for completion | |
202 | * @host: MMC host to start command | |
203 | * @mrq: MMC request to start | |
204 | * | |
205 | * Start a new MMC custom command request for a host, and wait | |
206 | * for the command to complete. Does not attempt to parse the | |
207 | * response. | |
208 | */ | |
209 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
210 | { | |
211 | DECLARE_COMPLETION_ONSTACK(complete); | |
212 | ||
213 | mrq->done_data = &complete; | |
214 | mrq->done = mmc_wait_done; | |
215 | ||
216 | mmc_start_request(host, mrq); | |
217 | ||
218 | wait_for_completion(&complete); | |
219 | } | |
220 | ||
221 | EXPORT_SYMBOL(mmc_wait_for_req); | |
222 | ||
223 | /** | |
224 | * mmc_wait_for_cmd - start a command and wait for completion | |
225 | * @host: MMC host to start command | |
226 | * @cmd: MMC command to start | |
227 | * @retries: maximum number of retries | |
228 | * | |
229 | * Start a new MMC command for a host, and wait for the command | |
230 | * to complete. Return any error that occurred while the command | |
231 | * was executing. Do not attempt to parse the response. | |
232 | */ | |
233 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
234 | { | |
235 | struct mmc_request mrq; | |
236 | ||
237 | WARN_ON(!host->claimed); | |
238 | ||
239 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
240 | ||
241 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
242 | cmd->retries = retries; | |
243 | ||
244 | mrq.cmd = cmd; | |
245 | cmd->data = NULL; | |
246 | ||
247 | mmc_wait_for_req(host, &mrq); | |
248 | ||
249 | return cmd->error; | |
250 | } | |
251 | ||
252 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
253 | ||
254 | /** | |
255 | * mmc_set_data_timeout - set the timeout for a data command | |
256 | * @data: data phase for command | |
257 | * @card: the MMC card associated with the data transfer | |
258 | * | |
259 | * Computes the data timeout parameters according to the | |
260 | * correct algorithm given the card type. | |
261 | */ | |
262 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) | |
263 | { | |
264 | unsigned int mult; | |
265 | ||
266 | /* | |
267 | * SDIO cards only define an upper 1 s limit on access. | |
268 | */ | |
269 | if (mmc_card_sdio(card)) { | |
270 | data->timeout_ns = 1000000000; | |
271 | data->timeout_clks = 0; | |
272 | return; | |
273 | } | |
274 | ||
275 | /* | |
276 | * SD cards use a 100 multiplier rather than 10 | |
277 | */ | |
278 | mult = mmc_card_sd(card) ? 100 : 10; | |
279 | ||
280 | /* | |
281 | * Scale up the multiplier (and therefore the timeout) by | |
282 | * the r2w factor for writes. | |
283 | */ | |
284 | if (data->flags & MMC_DATA_WRITE) | |
285 | mult <<= card->csd.r2w_factor; | |
286 | ||
287 | data->timeout_ns = card->csd.tacc_ns * mult; | |
288 | data->timeout_clks = card->csd.tacc_clks * mult; | |
289 | ||
290 | /* | |
291 | * SD cards also have an upper limit on the timeout. | |
292 | */ | |
293 | if (mmc_card_sd(card)) { | |
294 | unsigned int timeout_us, limit_us; | |
295 | ||
296 | timeout_us = data->timeout_ns / 1000; | |
297 | timeout_us += data->timeout_clks * 1000 / | |
298 | (card->host->ios.clock / 1000); | |
299 | ||
300 | if (data->flags & MMC_DATA_WRITE) | |
301 | /* | |
302 | * The limit is really 250 ms, but that is | |
303 | * insufficient for some crappy cards. | |
304 | */ | |
305 | limit_us = 300000; | |
306 | else | |
307 | limit_us = 100000; | |
308 | ||
309 | /* | |
310 | * SDHC cards always use these fixed values. | |
311 | */ | |
312 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
313 | data->timeout_ns = limit_us * 1000; | |
314 | data->timeout_clks = 0; | |
315 | } | |
316 | } | |
317 | /* | |
318 | * Some cards need very high timeouts if driven in SPI mode. | |
319 | * The worst observed timeout was 900ms after writing a | |
320 | * continuous stream of data until the internal logic | |
321 | * overflowed. | |
322 | */ | |
323 | if (mmc_host_is_spi(card->host)) { | |
324 | if (data->flags & MMC_DATA_WRITE) { | |
325 | if (data->timeout_ns < 1000000000) | |
326 | data->timeout_ns = 1000000000; /* 1s */ | |
327 | } else { | |
328 | if (data->timeout_ns < 100000000) | |
329 | data->timeout_ns = 100000000; /* 100ms */ | |
330 | } | |
331 | } | |
332 | } | |
333 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
334 | ||
335 | /** | |
336 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
337 | * @card: the MMC card associated with the data transfer | |
338 | * @sz: original transfer size | |
339 | * | |
340 | * Pads the original data size with a number of extra bytes in | |
341 | * order to avoid controller bugs and/or performance hits | |
342 | * (e.g. some controllers revert to PIO for certain sizes). | |
343 | * | |
344 | * Returns the improved size, which might be unmodified. | |
345 | * | |
346 | * Note that this function is only relevant when issuing a | |
347 | * single scatter gather entry. | |
348 | */ | |
349 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
350 | { | |
351 | /* | |
352 | * FIXME: We don't have a system for the controller to tell | |
353 | * the core about its problems yet, so for now we just 32-bit | |
354 | * align the size. | |
355 | */ | |
356 | sz = ((sz + 3) / 4) * 4; | |
357 | ||
358 | return sz; | |
359 | } | |
360 | EXPORT_SYMBOL(mmc_align_data_size); | |
361 | ||
362 | /** | |
363 | * mmc_host_enable - enable a host. | |
364 | * @host: mmc host to enable | |
365 | * | |
366 | * Hosts that support power saving can use the 'enable' and 'disable' | |
367 | * methods to exit and enter power saving states. For more information | |
368 | * see comments for struct mmc_host_ops. | |
369 | */ | |
370 | int mmc_host_enable(struct mmc_host *host) | |
371 | { | |
372 | if (!(host->caps & MMC_CAP_DISABLE)) | |
373 | return 0; | |
374 | ||
375 | if (host->en_dis_recurs) | |
376 | return 0; | |
377 | ||
378 | if (host->nesting_cnt++) | |
379 | return 0; | |
380 | ||
381 | cancel_delayed_work_sync(&host->disable); | |
382 | ||
383 | if (host->enabled) | |
384 | return 0; | |
385 | ||
386 | if (host->ops->enable) { | |
387 | int err; | |
388 | ||
389 | host->en_dis_recurs = 1; | |
390 | err = host->ops->enable(host); | |
391 | host->en_dis_recurs = 0; | |
392 | ||
393 | if (err) { | |
394 | pr_debug("%s: enable error %d\n", | |
395 | mmc_hostname(host), err); | |
396 | return err; | |
397 | } | |
398 | } | |
399 | host->enabled = 1; | |
400 | return 0; | |
401 | } | |
402 | EXPORT_SYMBOL(mmc_host_enable); | |
403 | ||
404 | static int mmc_host_do_disable(struct mmc_host *host, int lazy) | |
405 | { | |
406 | if (host->ops->disable) { | |
407 | int err; | |
408 | ||
409 | host->en_dis_recurs = 1; | |
410 | err = host->ops->disable(host, lazy); | |
411 | host->en_dis_recurs = 0; | |
412 | ||
413 | if (err < 0) { | |
414 | pr_debug("%s: disable error %d\n", | |
415 | mmc_hostname(host), err); | |
416 | return err; | |
417 | } | |
418 | if (err > 0) { | |
419 | unsigned long delay = msecs_to_jiffies(err); | |
420 | ||
421 | mmc_schedule_delayed_work(&host->disable, delay); | |
422 | } | |
423 | } | |
424 | host->enabled = 0; | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /** | |
429 | * mmc_host_disable - disable a host. | |
430 | * @host: mmc host to disable | |
431 | * | |
432 | * Hosts that support power saving can use the 'enable' and 'disable' | |
433 | * methods to exit and enter power saving states. For more information | |
434 | * see comments for struct mmc_host_ops. | |
435 | */ | |
436 | int mmc_host_disable(struct mmc_host *host) | |
437 | { | |
438 | int err; | |
439 | ||
440 | if (!(host->caps & MMC_CAP_DISABLE)) | |
441 | return 0; | |
442 | ||
443 | if (host->en_dis_recurs) | |
444 | return 0; | |
445 | ||
446 | if (--host->nesting_cnt) | |
447 | return 0; | |
448 | ||
449 | if (!host->enabled) | |
450 | return 0; | |
451 | ||
452 | err = mmc_host_do_disable(host, 0); | |
453 | return err; | |
454 | } | |
455 | EXPORT_SYMBOL(mmc_host_disable); | |
456 | ||
457 | /** | |
458 | * __mmc_claim_host - exclusively claim a host | |
459 | * @host: mmc host to claim | |
460 | * @abort: whether or not the operation should be aborted | |
461 | * | |
462 | * Claim a host for a set of operations. If @abort is non null and | |
463 | * dereference a non-zero value then this will return prematurely with | |
464 | * that non-zero value without acquiring the lock. Returns zero | |
465 | * with the lock held otherwise. | |
466 | */ | |
467 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) | |
468 | { | |
469 | DECLARE_WAITQUEUE(wait, current); | |
470 | unsigned long flags; | |
471 | int stop; | |
472 | ||
473 | might_sleep(); | |
474 | ||
475 | add_wait_queue(&host->wq, &wait); | |
476 | spin_lock_irqsave(&host->lock, flags); | |
477 | while (1) { | |
478 | set_current_state(TASK_UNINTERRUPTIBLE); | |
479 | stop = abort ? atomic_read(abort) : 0; | |
480 | if (stop || !host->claimed || host->claimer == current) | |
481 | break; | |
482 | spin_unlock_irqrestore(&host->lock, flags); | |
483 | schedule(); | |
484 | spin_lock_irqsave(&host->lock, flags); | |
485 | } | |
486 | set_current_state(TASK_RUNNING); | |
487 | if (!stop) { | |
488 | host->claimed = 1; | |
489 | host->claimer = current; | |
490 | host->claim_cnt += 1; | |
491 | } else | |
492 | wake_up(&host->wq); | |
493 | spin_unlock_irqrestore(&host->lock, flags); | |
494 | remove_wait_queue(&host->wq, &wait); | |
495 | if (!stop) | |
496 | mmc_host_enable(host); | |
497 | return stop; | |
498 | } | |
499 | ||
500 | EXPORT_SYMBOL(__mmc_claim_host); | |
501 | ||
502 | /** | |
503 | * mmc_try_claim_host - try exclusively to claim a host | |
504 | * @host: mmc host to claim | |
505 | * | |
506 | * Returns %1 if the host is claimed, %0 otherwise. | |
507 | */ | |
508 | int mmc_try_claim_host(struct mmc_host *host) | |
509 | { | |
510 | int claimed_host = 0; | |
511 | unsigned long flags; | |
512 | ||
513 | spin_lock_irqsave(&host->lock, flags); | |
514 | if (!host->claimed || host->claimer == current) { | |
515 | host->claimed = 1; | |
516 | host->claimer = current; | |
517 | host->claim_cnt += 1; | |
518 | claimed_host = 1; | |
519 | } | |
520 | spin_unlock_irqrestore(&host->lock, flags); | |
521 | return claimed_host; | |
522 | } | |
523 | EXPORT_SYMBOL(mmc_try_claim_host); | |
524 | ||
525 | static void mmc_do_release_host(struct mmc_host *host) | |
526 | { | |
527 | unsigned long flags; | |
528 | ||
529 | spin_lock_irqsave(&host->lock, flags); | |
530 | if (--host->claim_cnt) { | |
531 | /* Release for nested claim */ | |
532 | spin_unlock_irqrestore(&host->lock, flags); | |
533 | } else { | |
534 | host->claimed = 0; | |
535 | host->claimer = NULL; | |
536 | spin_unlock_irqrestore(&host->lock, flags); | |
537 | wake_up(&host->wq); | |
538 | } | |
539 | } | |
540 | ||
541 | void mmc_host_deeper_disable(struct work_struct *work) | |
542 | { | |
543 | struct mmc_host *host = | |
544 | container_of(work, struct mmc_host, disable.work); | |
545 | ||
546 | /* If the host is claimed then we do not want to disable it anymore */ | |
547 | if (!mmc_try_claim_host(host)) | |
548 | return; | |
549 | mmc_host_do_disable(host, 1); | |
550 | mmc_do_release_host(host); | |
551 | } | |
552 | ||
553 | /** | |
554 | * mmc_host_lazy_disable - lazily disable a host. | |
555 | * @host: mmc host to disable | |
556 | * | |
557 | * Hosts that support power saving can use the 'enable' and 'disable' | |
558 | * methods to exit and enter power saving states. For more information | |
559 | * see comments for struct mmc_host_ops. | |
560 | */ | |
561 | int mmc_host_lazy_disable(struct mmc_host *host) | |
562 | { | |
563 | if (!(host->caps & MMC_CAP_DISABLE)) | |
564 | return 0; | |
565 | ||
566 | if (host->en_dis_recurs) | |
567 | return 0; | |
568 | ||
569 | if (--host->nesting_cnt) | |
570 | return 0; | |
571 | ||
572 | if (!host->enabled) | |
573 | return 0; | |
574 | ||
575 | if (host->disable_delay) { | |
576 | mmc_schedule_delayed_work(&host->disable, | |
577 | msecs_to_jiffies(host->disable_delay)); | |
578 | return 0; | |
579 | } else | |
580 | return mmc_host_do_disable(host, 1); | |
581 | } | |
582 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
583 | ||
584 | /** | |
585 | * mmc_release_host - release a host | |
586 | * @host: mmc host to release | |
587 | * | |
588 | * Release a MMC host, allowing others to claim the host | |
589 | * for their operations. | |
590 | */ | |
591 | void mmc_release_host(struct mmc_host *host) | |
592 | { | |
593 | WARN_ON(!host->claimed); | |
594 | ||
595 | mmc_host_lazy_disable(host); | |
596 | ||
597 | mmc_do_release_host(host); | |
598 | } | |
599 | ||
600 | EXPORT_SYMBOL(mmc_release_host); | |
601 | ||
602 | /* | |
603 | * Internal function that does the actual ios call to the host driver, | |
604 | * optionally printing some debug output. | |
605 | */ | |
606 | static inline void mmc_set_ios(struct mmc_host *host) | |
607 | { | |
608 | struct mmc_ios *ios = &host->ios; | |
609 | ||
610 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " | |
611 | "width %u timing %u\n", | |
612 | mmc_hostname(host), ios->clock, ios->bus_mode, | |
613 | ios->power_mode, ios->chip_select, ios->vdd, | |
614 | ios->bus_width, ios->timing); | |
615 | ||
616 | host->ops->set_ios(host, ios); | |
617 | } | |
618 | ||
619 | /* | |
620 | * Control chip select pin on a host. | |
621 | */ | |
622 | void mmc_set_chip_select(struct mmc_host *host, int mode) | |
623 | { | |
624 | host->ios.chip_select = mode; | |
625 | mmc_set_ios(host); | |
626 | } | |
627 | ||
628 | /* | |
629 | * Sets the host clock to the highest possible frequency that | |
630 | * is below "hz". | |
631 | */ | |
632 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) | |
633 | { | |
634 | WARN_ON(hz < host->f_min); | |
635 | ||
636 | if (hz > host->f_max) | |
637 | hz = host->f_max; | |
638 | ||
639 | host->ios.clock = hz; | |
640 | mmc_set_ios(host); | |
641 | } | |
642 | ||
643 | /* | |
644 | * Change the bus mode (open drain/push-pull) of a host. | |
645 | */ | |
646 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
647 | { | |
648 | host->ios.bus_mode = mode; | |
649 | mmc_set_ios(host); | |
650 | } | |
651 | ||
652 | /* | |
653 | * Change data bus width of a host. | |
654 | */ | |
655 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
656 | { | |
657 | host->ios.bus_width = width; | |
658 | mmc_set_ios(host); | |
659 | } | |
660 | ||
661 | /** | |
662 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
663 | * @vdd: voltage (mV) | |
664 | * @low_bits: prefer low bits in boundary cases | |
665 | * | |
666 | * This function returns the OCR bit number according to the provided @vdd | |
667 | * value. If conversion is not possible a negative errno value returned. | |
668 | * | |
669 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
670 | * on boundary voltages. For example, | |
671 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
672 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
673 | * | |
674 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
675 | */ | |
676 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
677 | { | |
678 | const int max_bit = ilog2(MMC_VDD_35_36); | |
679 | int bit; | |
680 | ||
681 | if (vdd < 1650 || vdd > 3600) | |
682 | return -EINVAL; | |
683 | ||
684 | if (vdd >= 1650 && vdd <= 1950) | |
685 | return ilog2(MMC_VDD_165_195); | |
686 | ||
687 | if (low_bits) | |
688 | vdd -= 1; | |
689 | ||
690 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
691 | bit = (vdd - 2000) / 100 + 8; | |
692 | if (bit > max_bit) | |
693 | return max_bit; | |
694 | return bit; | |
695 | } | |
696 | ||
697 | /** | |
698 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
699 | * @vdd_min: minimum voltage value (mV) | |
700 | * @vdd_max: maximum voltage value (mV) | |
701 | * | |
702 | * This function returns the OCR mask bits according to the provided @vdd_min | |
703 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
704 | * | |
705 | * Notes wrt boundary cases: | |
706 | * This function sets the OCR bits for all boundary voltages, for example | |
707 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
708 | * MMC_VDD_34_35 mask. | |
709 | */ | |
710 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
711 | { | |
712 | u32 mask = 0; | |
713 | ||
714 | if (vdd_max < vdd_min) | |
715 | return 0; | |
716 | ||
717 | /* Prefer high bits for the boundary vdd_max values. */ | |
718 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
719 | if (vdd_max < 0) | |
720 | return 0; | |
721 | ||
722 | /* Prefer low bits for the boundary vdd_min values. */ | |
723 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
724 | if (vdd_min < 0) | |
725 | return 0; | |
726 | ||
727 | /* Fill the mask, from max bit to min bit. */ | |
728 | while (vdd_max >= vdd_min) | |
729 | mask |= 1 << vdd_max--; | |
730 | ||
731 | return mask; | |
732 | } | |
733 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
734 | ||
735 | #ifdef CONFIG_REGULATOR | |
736 | ||
737 | /** | |
738 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
739 | * @supply: regulator to use | |
740 | * | |
741 | * This returns either a negative errno, or a mask of voltages that | |
742 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
743 | * regulator. This would normally be called before registering the | |
744 | * MMC host adapter. | |
745 | */ | |
746 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
747 | { | |
748 | int result = 0; | |
749 | int count; | |
750 | int i; | |
751 | ||
752 | count = regulator_count_voltages(supply); | |
753 | if (count < 0) | |
754 | return count; | |
755 | ||
756 | for (i = 0; i < count; i++) { | |
757 | int vdd_uV; | |
758 | int vdd_mV; | |
759 | ||
760 | vdd_uV = regulator_list_voltage(supply, i); | |
761 | if (vdd_uV <= 0) | |
762 | continue; | |
763 | ||
764 | vdd_mV = vdd_uV / 1000; | |
765 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
766 | } | |
767 | ||
768 | return result; | |
769 | } | |
770 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
771 | ||
772 | /** | |
773 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
774 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) | |
775 | * @supply: regulator to use | |
776 | * | |
777 | * Returns zero on success, else negative errno. | |
778 | * | |
779 | * MMC host drivers may use this to enable or disable a regulator using | |
780 | * a particular supply voltage. This would normally be called from the | |
781 | * set_ios() method. | |
782 | */ | |
783 | int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit) | |
784 | { | |
785 | int result = 0; | |
786 | int min_uV, max_uV; | |
787 | int enabled; | |
788 | ||
789 | enabled = regulator_is_enabled(supply); | |
790 | if (enabled < 0) | |
791 | return enabled; | |
792 | ||
793 | if (vdd_bit) { | |
794 | int tmp; | |
795 | int voltage; | |
796 | ||
797 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
798 | * bits this regulator doesn't quite support ... don't | |
799 | * be too picky, most cards and regulators are OK with | |
800 | * a 0.1V range goof (it's a small error percentage). | |
801 | */ | |
802 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
803 | if (tmp == 0) { | |
804 | min_uV = 1650 * 1000; | |
805 | max_uV = 1950 * 1000; | |
806 | } else { | |
807 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
808 | max_uV = min_uV + 100 * 1000; | |
809 | } | |
810 | ||
811 | /* avoid needless changes to this voltage; the regulator | |
812 | * might not allow this operation | |
813 | */ | |
814 | voltage = regulator_get_voltage(supply); | |
815 | if (voltage < 0) | |
816 | result = voltage; | |
817 | else if (voltage < min_uV || voltage > max_uV) | |
818 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
819 | else | |
820 | result = 0; | |
821 | ||
822 | if (result == 0 && !enabled) | |
823 | result = regulator_enable(supply); | |
824 | } else if (enabled) { | |
825 | result = regulator_disable(supply); | |
826 | } | |
827 | ||
828 | return result; | |
829 | } | |
830 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
831 | ||
832 | #endif | |
833 | ||
834 | /* | |
835 | * Mask off any voltages we don't support and select | |
836 | * the lowest voltage | |
837 | */ | |
838 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
839 | { | |
840 | int bit; | |
841 | ||
842 | ocr &= host->ocr_avail; | |
843 | ||
844 | bit = ffs(ocr); | |
845 | if (bit) { | |
846 | bit -= 1; | |
847 | ||
848 | ocr &= 3 << bit; | |
849 | ||
850 | host->ios.vdd = bit; | |
851 | mmc_set_ios(host); | |
852 | } else { | |
853 | pr_warning("%s: host doesn't support card's voltages\n", | |
854 | mmc_hostname(host)); | |
855 | ocr = 0; | |
856 | } | |
857 | ||
858 | return ocr; | |
859 | } | |
860 | ||
861 | /* | |
862 | * Select timing parameters for host. | |
863 | */ | |
864 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) | |
865 | { | |
866 | host->ios.timing = timing; | |
867 | mmc_set_ios(host); | |
868 | } | |
869 | ||
870 | /* | |
871 | * Apply power to the MMC stack. This is a two-stage process. | |
872 | * First, we enable power to the card without the clock running. | |
873 | * We then wait a bit for the power to stabilise. Finally, | |
874 | * enable the bus drivers and clock to the card. | |
875 | * | |
876 | * We must _NOT_ enable the clock prior to power stablising. | |
877 | * | |
878 | * If a host does all the power sequencing itself, ignore the | |
879 | * initial MMC_POWER_UP stage. | |
880 | */ | |
881 | static void mmc_power_up(struct mmc_host *host) | |
882 | { | |
883 | int bit; | |
884 | ||
885 | /* If ocr is set, we use it */ | |
886 | if (host->ocr) | |
887 | bit = ffs(host->ocr) - 1; | |
888 | else | |
889 | bit = fls(host->ocr_avail) - 1; | |
890 | ||
891 | host->ios.vdd = bit; | |
892 | if (mmc_host_is_spi(host)) { | |
893 | host->ios.chip_select = MMC_CS_HIGH; | |
894 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
895 | } else { | |
896 | host->ios.chip_select = MMC_CS_DONTCARE; | |
897 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
898 | } | |
899 | host->ios.power_mode = MMC_POWER_UP; | |
900 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
901 | host->ios.timing = MMC_TIMING_LEGACY; | |
902 | mmc_set_ios(host); | |
903 | ||
904 | /* | |
905 | * This delay should be sufficient to allow the power supply | |
906 | * to reach the minimum voltage. | |
907 | */ | |
908 | mmc_delay(10); | |
909 | ||
910 | if (host->f_min > 400000) { | |
911 | pr_warning("%s: Minimum clock frequency too high for " | |
912 | "identification mode\n", mmc_hostname(host)); | |
913 | host->ios.clock = host->f_min; | |
914 | } else | |
915 | host->ios.clock = 400000; | |
916 | ||
917 | host->ios.power_mode = MMC_POWER_ON; | |
918 | mmc_set_ios(host); | |
919 | ||
920 | /* | |
921 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
922 | * time required to reach a stable voltage. | |
923 | */ | |
924 | mmc_delay(10); | |
925 | } | |
926 | ||
927 | static void mmc_power_off(struct mmc_host *host) | |
928 | { | |
929 | host->ios.clock = 0; | |
930 | host->ios.vdd = 0; | |
931 | if (!mmc_host_is_spi(host)) { | |
932 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
933 | host->ios.chip_select = MMC_CS_DONTCARE; | |
934 | } | |
935 | host->ios.power_mode = MMC_POWER_OFF; | |
936 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
937 | host->ios.timing = MMC_TIMING_LEGACY; | |
938 | mmc_set_ios(host); | |
939 | } | |
940 | ||
941 | /* | |
942 | * Cleanup when the last reference to the bus operator is dropped. | |
943 | */ | |
944 | static void __mmc_release_bus(struct mmc_host *host) | |
945 | { | |
946 | BUG_ON(!host); | |
947 | BUG_ON(host->bus_refs); | |
948 | BUG_ON(!host->bus_dead); | |
949 | ||
950 | host->bus_ops = NULL; | |
951 | } | |
952 | ||
953 | /* | |
954 | * Increase reference count of bus operator | |
955 | */ | |
956 | static inline void mmc_bus_get(struct mmc_host *host) | |
957 | { | |
958 | unsigned long flags; | |
959 | ||
960 | spin_lock_irqsave(&host->lock, flags); | |
961 | host->bus_refs++; | |
962 | spin_unlock_irqrestore(&host->lock, flags); | |
963 | } | |
964 | ||
965 | /* | |
966 | * Decrease reference count of bus operator and free it if | |
967 | * it is the last reference. | |
968 | */ | |
969 | static inline void mmc_bus_put(struct mmc_host *host) | |
970 | { | |
971 | unsigned long flags; | |
972 | ||
973 | spin_lock_irqsave(&host->lock, flags); | |
974 | host->bus_refs--; | |
975 | if ((host->bus_refs == 0) && host->bus_ops) | |
976 | __mmc_release_bus(host); | |
977 | spin_unlock_irqrestore(&host->lock, flags); | |
978 | } | |
979 | ||
980 | /* | |
981 | * Assign a mmc bus handler to a host. Only one bus handler may control a | |
982 | * host at any given time. | |
983 | */ | |
984 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) | |
985 | { | |
986 | unsigned long flags; | |
987 | ||
988 | BUG_ON(!host); | |
989 | BUG_ON(!ops); | |
990 | ||
991 | WARN_ON(!host->claimed); | |
992 | ||
993 | spin_lock_irqsave(&host->lock, flags); | |
994 | ||
995 | BUG_ON(host->bus_ops); | |
996 | BUG_ON(host->bus_refs); | |
997 | ||
998 | host->bus_ops = ops; | |
999 | host->bus_refs = 1; | |
1000 | host->bus_dead = 0; | |
1001 | ||
1002 | spin_unlock_irqrestore(&host->lock, flags); | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Remove the current bus handler from a host. Assumes that there are | |
1007 | * no interesting cards left, so the bus is powered down. | |
1008 | */ | |
1009 | void mmc_detach_bus(struct mmc_host *host) | |
1010 | { | |
1011 | unsigned long flags; | |
1012 | ||
1013 | BUG_ON(!host); | |
1014 | ||
1015 | WARN_ON(!host->claimed); | |
1016 | WARN_ON(!host->bus_ops); | |
1017 | ||
1018 | spin_lock_irqsave(&host->lock, flags); | |
1019 | ||
1020 | host->bus_dead = 1; | |
1021 | ||
1022 | spin_unlock_irqrestore(&host->lock, flags); | |
1023 | ||
1024 | mmc_power_off(host); | |
1025 | ||
1026 | mmc_bus_put(host); | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * mmc_detect_change - process change of state on a MMC socket | |
1031 | * @host: host which changed state. | |
1032 | * @delay: optional delay to wait before detection (jiffies) | |
1033 | * | |
1034 | * MMC drivers should call this when they detect a card has been | |
1035 | * inserted or removed. The MMC layer will confirm that any | |
1036 | * present card is still functional, and initialize any newly | |
1037 | * inserted. | |
1038 | */ | |
1039 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) | |
1040 | { | |
1041 | #ifdef CONFIG_MMC_DEBUG | |
1042 | unsigned long flags; | |
1043 | spin_lock_irqsave(&host->lock, flags); | |
1044 | WARN_ON(host->removed); | |
1045 | spin_unlock_irqrestore(&host->lock, flags); | |
1046 | #endif | |
1047 | ||
1048 | mmc_schedule_delayed_work(&host->detect, delay); | |
1049 | } | |
1050 | ||
1051 | EXPORT_SYMBOL(mmc_detect_change); | |
1052 | ||
1053 | ||
1054 | void mmc_rescan(struct work_struct *work) | |
1055 | { | |
1056 | struct mmc_host *host = | |
1057 | container_of(work, struct mmc_host, detect.work); | |
1058 | u32 ocr; | |
1059 | int err; | |
1060 | unsigned long flags; | |
1061 | ||
1062 | spin_lock_irqsave(&host->lock, flags); | |
1063 | ||
1064 | if (host->rescan_disable) { | |
1065 | spin_unlock_irqrestore(&host->lock, flags); | |
1066 | return; | |
1067 | } | |
1068 | ||
1069 | spin_unlock_irqrestore(&host->lock, flags); | |
1070 | ||
1071 | ||
1072 | mmc_bus_get(host); | |
1073 | ||
1074 | /* if there is a card registered, check whether it is still present */ | |
1075 | if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead) | |
1076 | host->bus_ops->detect(host); | |
1077 | ||
1078 | mmc_bus_put(host); | |
1079 | ||
1080 | ||
1081 | mmc_bus_get(host); | |
1082 | ||
1083 | /* if there still is a card present, stop here */ | |
1084 | if (host->bus_ops != NULL) { | |
1085 | mmc_bus_put(host); | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | /* detect a newly inserted card */ | |
1090 | ||
1091 | /* | |
1092 | * Only we can add a new handler, so it's safe to | |
1093 | * release the lock here. | |
1094 | */ | |
1095 | mmc_bus_put(host); | |
1096 | ||
1097 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) | |
1098 | goto out; | |
1099 | ||
1100 | mmc_claim_host(host); | |
1101 | ||
1102 | mmc_power_up(host); | |
1103 | sdio_reset(host); | |
1104 | mmc_go_idle(host); | |
1105 | ||
1106 | mmc_send_if_cond(host, host->ocr_avail); | |
1107 | ||
1108 | /* | |
1109 | * First we search for SDIO... | |
1110 | */ | |
1111 | err = mmc_send_io_op_cond(host, 0, &ocr); | |
1112 | if (!err) { | |
1113 | if (mmc_attach_sdio(host, ocr)) { | |
1114 | mmc_claim_host(host); | |
1115 | /* try SDMEM (but not MMC) even if SDIO is broken */ | |
1116 | if (mmc_send_app_op_cond(host, 0, &ocr)) | |
1117 | goto out_fail; | |
1118 | ||
1119 | if (mmc_attach_sd(host, ocr)) | |
1120 | mmc_power_off(host); | |
1121 | } | |
1122 | goto out; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * ...then normal SD... | |
1127 | */ | |
1128 | err = mmc_send_app_op_cond(host, 0, &ocr); | |
1129 | if (!err) { | |
1130 | if (mmc_attach_sd(host, ocr)) | |
1131 | mmc_power_off(host); | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * ...and finally MMC. | |
1137 | */ | |
1138 | err = mmc_send_op_cond(host, 0, &ocr); | |
1139 | if (!err) { | |
1140 | if (mmc_attach_mmc(host, ocr)) | |
1141 | mmc_power_off(host); | |
1142 | goto out; | |
1143 | } | |
1144 | ||
1145 | out_fail: | |
1146 | mmc_release_host(host); | |
1147 | mmc_power_off(host); | |
1148 | ||
1149 | out: | |
1150 | if (host->caps & MMC_CAP_NEEDS_POLL) | |
1151 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1152 | } | |
1153 | ||
1154 | void mmc_start_host(struct mmc_host *host) | |
1155 | { | |
1156 | mmc_power_off(host); | |
1157 | mmc_detect_change(host, 0); | |
1158 | } | |
1159 | ||
1160 | void mmc_stop_host(struct mmc_host *host) | |
1161 | { | |
1162 | #ifdef CONFIG_MMC_DEBUG | |
1163 | unsigned long flags; | |
1164 | spin_lock_irqsave(&host->lock, flags); | |
1165 | host->removed = 1; | |
1166 | spin_unlock_irqrestore(&host->lock, flags); | |
1167 | #endif | |
1168 | ||
1169 | if (host->caps & MMC_CAP_DISABLE) | |
1170 | cancel_delayed_work(&host->disable); | |
1171 | cancel_delayed_work(&host->detect); | |
1172 | mmc_flush_scheduled_work(); | |
1173 | ||
1174 | /* clear pm flags now and let card drivers set them as needed */ | |
1175 | host->pm_flags = 0; | |
1176 | ||
1177 | mmc_bus_get(host); | |
1178 | if (host->bus_ops && !host->bus_dead) { | |
1179 | if (host->bus_ops->remove) | |
1180 | host->bus_ops->remove(host); | |
1181 | ||
1182 | mmc_claim_host(host); | |
1183 | mmc_detach_bus(host); | |
1184 | mmc_release_host(host); | |
1185 | mmc_bus_put(host); | |
1186 | return; | |
1187 | } | |
1188 | mmc_bus_put(host); | |
1189 | ||
1190 | BUG_ON(host->card); | |
1191 | ||
1192 | mmc_power_off(host); | |
1193 | } | |
1194 | ||
1195 | void mmc_power_save_host(struct mmc_host *host) | |
1196 | { | |
1197 | mmc_bus_get(host); | |
1198 | ||
1199 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1200 | mmc_bus_put(host); | |
1201 | return; | |
1202 | } | |
1203 | ||
1204 | if (host->bus_ops->power_save) | |
1205 | host->bus_ops->power_save(host); | |
1206 | ||
1207 | mmc_bus_put(host); | |
1208 | ||
1209 | mmc_power_off(host); | |
1210 | } | |
1211 | EXPORT_SYMBOL(mmc_power_save_host); | |
1212 | ||
1213 | void mmc_power_restore_host(struct mmc_host *host) | |
1214 | { | |
1215 | mmc_bus_get(host); | |
1216 | ||
1217 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1218 | mmc_bus_put(host); | |
1219 | return; | |
1220 | } | |
1221 | ||
1222 | mmc_power_up(host); | |
1223 | host->bus_ops->power_restore(host); | |
1224 | ||
1225 | mmc_bus_put(host); | |
1226 | } | |
1227 | EXPORT_SYMBOL(mmc_power_restore_host); | |
1228 | ||
1229 | int mmc_card_awake(struct mmc_host *host) | |
1230 | { | |
1231 | int err = -ENOSYS; | |
1232 | ||
1233 | mmc_bus_get(host); | |
1234 | ||
1235 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1236 | err = host->bus_ops->awake(host); | |
1237 | ||
1238 | mmc_bus_put(host); | |
1239 | ||
1240 | return err; | |
1241 | } | |
1242 | EXPORT_SYMBOL(mmc_card_awake); | |
1243 | ||
1244 | int mmc_card_sleep(struct mmc_host *host) | |
1245 | { | |
1246 | int err = -ENOSYS; | |
1247 | ||
1248 | mmc_bus_get(host); | |
1249 | ||
1250 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1251 | err = host->bus_ops->sleep(host); | |
1252 | ||
1253 | mmc_bus_put(host); | |
1254 | ||
1255 | return err; | |
1256 | } | |
1257 | EXPORT_SYMBOL(mmc_card_sleep); | |
1258 | ||
1259 | int mmc_card_can_sleep(struct mmc_host *host) | |
1260 | { | |
1261 | struct mmc_card *card = host->card; | |
1262 | ||
1263 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
1264 | return 1; | |
1265 | return 0; | |
1266 | } | |
1267 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
1268 | ||
1269 | #ifdef CONFIG_PM | |
1270 | ||
1271 | /** | |
1272 | * mmc_suspend_host - suspend a host | |
1273 | * @host: mmc host | |
1274 | */ | |
1275 | int mmc_suspend_host(struct mmc_host *host) | |
1276 | { | |
1277 | int err = 0; | |
1278 | ||
1279 | if (host->caps & MMC_CAP_DISABLE) | |
1280 | cancel_delayed_work(&host->disable); | |
1281 | cancel_delayed_work(&host->detect); | |
1282 | mmc_flush_scheduled_work(); | |
1283 | ||
1284 | mmc_bus_get(host); | |
1285 | if (host->bus_ops && !host->bus_dead) { | |
1286 | if (host->bus_ops->suspend) | |
1287 | err = host->bus_ops->suspend(host); | |
1288 | } | |
1289 | mmc_bus_put(host); | |
1290 | ||
1291 | if (!err && !(host->pm_flags & MMC_PM_KEEP_POWER)) | |
1292 | mmc_power_off(host); | |
1293 | ||
1294 | return err; | |
1295 | } | |
1296 | ||
1297 | EXPORT_SYMBOL(mmc_suspend_host); | |
1298 | ||
1299 | /** | |
1300 | * mmc_resume_host - resume a previously suspended host | |
1301 | * @host: mmc host | |
1302 | */ | |
1303 | int mmc_resume_host(struct mmc_host *host) | |
1304 | { | |
1305 | int err = 0; | |
1306 | ||
1307 | mmc_bus_get(host); | |
1308 | if (host->bus_ops && !host->bus_dead) { | |
1309 | if (!(host->pm_flags & MMC_PM_KEEP_POWER)) { | |
1310 | mmc_power_up(host); | |
1311 | mmc_select_voltage(host, host->ocr); | |
1312 | } | |
1313 | BUG_ON(!host->bus_ops->resume); | |
1314 | err = host->bus_ops->resume(host); | |
1315 | if (err) { | |
1316 | printk(KERN_WARNING "%s: error %d during resume " | |
1317 | "(card was removed?)\n", | |
1318 | mmc_hostname(host), err); | |
1319 | err = 0; | |
1320 | } | |
1321 | } | |
1322 | mmc_bus_put(host); | |
1323 | ||
1324 | return err; | |
1325 | } | |
1326 | EXPORT_SYMBOL(mmc_resume_host); | |
1327 | ||
1328 | /* Do the card removal on suspend if card is assumed removeable | |
1329 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
1330 | to sync the card. | |
1331 | */ | |
1332 | int mmc_pm_notify(struct notifier_block *notify_block, | |
1333 | unsigned long mode, void *unused) | |
1334 | { | |
1335 | struct mmc_host *host = container_of( | |
1336 | notify_block, struct mmc_host, pm_notify); | |
1337 | unsigned long flags; | |
1338 | ||
1339 | ||
1340 | switch (mode) { | |
1341 | case PM_HIBERNATION_PREPARE: | |
1342 | case PM_SUSPEND_PREPARE: | |
1343 | ||
1344 | spin_lock_irqsave(&host->lock, flags); | |
1345 | host->rescan_disable = 1; | |
1346 | spin_unlock_irqrestore(&host->lock, flags); | |
1347 | cancel_delayed_work_sync(&host->detect); | |
1348 | ||
1349 | if (!host->bus_ops || host->bus_ops->suspend) | |
1350 | break; | |
1351 | ||
1352 | mmc_claim_host(host); | |
1353 | ||
1354 | if (host->bus_ops->remove) | |
1355 | host->bus_ops->remove(host); | |
1356 | ||
1357 | mmc_detach_bus(host); | |
1358 | mmc_release_host(host); | |
1359 | host->pm_flags = 0; | |
1360 | break; | |
1361 | ||
1362 | case PM_POST_SUSPEND: | |
1363 | case PM_POST_HIBERNATION: | |
1364 | ||
1365 | spin_lock_irqsave(&host->lock, flags); | |
1366 | host->rescan_disable = 0; | |
1367 | spin_unlock_irqrestore(&host->lock, flags); | |
1368 | mmc_detect_change(host, 0); | |
1369 | ||
1370 | } | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | #endif | |
1375 | ||
1376 | static int __init mmc_init(void) | |
1377 | { | |
1378 | int ret; | |
1379 | ||
1380 | workqueue = create_singlethread_workqueue("kmmcd"); | |
1381 | if (!workqueue) | |
1382 | return -ENOMEM; | |
1383 | ||
1384 | ret = mmc_register_bus(); | |
1385 | if (ret) | |
1386 | goto destroy_workqueue; | |
1387 | ||
1388 | ret = mmc_register_host_class(); | |
1389 | if (ret) | |
1390 | goto unregister_bus; | |
1391 | ||
1392 | ret = sdio_register_bus(); | |
1393 | if (ret) | |
1394 | goto unregister_host_class; | |
1395 | ||
1396 | return 0; | |
1397 | ||
1398 | unregister_host_class: | |
1399 | mmc_unregister_host_class(); | |
1400 | unregister_bus: | |
1401 | mmc_unregister_bus(); | |
1402 | destroy_workqueue: | |
1403 | destroy_workqueue(workqueue); | |
1404 | ||
1405 | return ret; | |
1406 | } | |
1407 | ||
1408 | static void __exit mmc_exit(void) | |
1409 | { | |
1410 | sdio_unregister_bus(); | |
1411 | mmc_unregister_host_class(); | |
1412 | mmc_unregister_bus(); | |
1413 | destroy_workqueue(workqueue); | |
1414 | } | |
1415 | ||
1416 | subsys_initcall(mmc_init); | |
1417 | module_exit(mmc_exit); | |
1418 | ||
1419 | MODULE_LICENSE("GPL"); |