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Commit | Line | Data |
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1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
ad3868b2 | 6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
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> | |
af8350c7 | 21 | #include <linux/leds.h> |
b57c43ad | 22 | #include <linux/scatterlist.h> |
86e8286a | 23 | #include <linux/log2.h> |
5c13941a | 24 | #include <linux/regulator/consumer.h> |
1da177e4 LT |
25 | |
26 | #include <linux/mmc/card.h> | |
27 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
28 | #include <linux/mmc/mmc.h> |
29 | #include <linux/mmc/sd.h> | |
1da177e4 | 30 | |
aaac1b47 | 31 | #include "core.h" |
ffce2e7e PO |
32 | #include "bus.h" |
33 | #include "host.h" | |
e29a7d73 | 34 | #include "sdio_bus.h" |
da7fbe58 PO |
35 | |
36 | #include "mmc_ops.h" | |
37 | #include "sd_ops.h" | |
5c4e6f13 | 38 | #include "sdio_ops.h" |
1da177e4 | 39 | |
ffce2e7e PO |
40 | static struct workqueue_struct *workqueue; |
41 | ||
af517150 DB |
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 | ||
ffce2e7e PO |
50 | /* |
51 | * Internal function. Schedule delayed work in the MMC work queue. | |
52 | */ | |
53 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
54 | unsigned long delay) | |
55 | { | |
56 | return queue_delayed_work(workqueue, work, delay); | |
57 | } | |
58 | ||
59 | /* | |
60 | * Internal function. Flush all scheduled work from the MMC work queue. | |
61 | */ | |
62 | static void mmc_flush_scheduled_work(void) | |
63 | { | |
64 | flush_workqueue(workqueue); | |
65 | } | |
66 | ||
1da177e4 | 67 | /** |
fe10c6ab RK |
68 | * mmc_request_done - finish processing an MMC request |
69 | * @host: MMC host which completed request | |
70 | * @mrq: MMC request which request | |
1da177e4 LT |
71 | * |
72 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 73 | * their processing of a request. |
1da177e4 LT |
74 | */ |
75 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
76 | { | |
77 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
78 | int err = cmd->error; |
79 | ||
af517150 DB |
80 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
81 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
82 | cmd->retries = 0; | |
83 | } | |
84 | ||
1da177e4 | 85 | if (err && cmd->retries) { |
e4d21708 PO |
86 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", |
87 | mmc_hostname(host), cmd->opcode, err); | |
88 | ||
1da177e4 LT |
89 | cmd->retries--; |
90 | cmd->error = 0; | |
91 | host->ops->request(host, mrq); | |
e4d21708 | 92 | } else { |
af8350c7 PO |
93 | led_trigger_event(host->led, LED_OFF); |
94 | ||
e4d21708 PO |
95 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
96 | mmc_hostname(host), cmd->opcode, err, | |
97 | cmd->resp[0], cmd->resp[1], | |
98 | cmd->resp[2], cmd->resp[3]); | |
99 | ||
100 | if (mrq->data) { | |
101 | pr_debug("%s: %d bytes transferred: %d\n", | |
102 | mmc_hostname(host), | |
103 | mrq->data->bytes_xfered, mrq->data->error); | |
104 | } | |
105 | ||
106 | if (mrq->stop) { | |
107 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
108 | mmc_hostname(host), mrq->stop->opcode, | |
109 | mrq->stop->error, | |
110 | mrq->stop->resp[0], mrq->stop->resp[1], | |
111 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
112 | } | |
113 | ||
114 | if (mrq->done) | |
115 | mrq->done(mrq); | |
1da177e4 LT |
116 | } |
117 | } | |
118 | ||
119 | EXPORT_SYMBOL(mmc_request_done); | |
120 | ||
39361851 | 121 | static void |
1da177e4 LT |
122 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
123 | { | |
976d9276 PO |
124 | #ifdef CONFIG_MMC_DEBUG |
125 | unsigned int i, sz; | |
a84756c5 | 126 | struct scatterlist *sg; |
976d9276 PO |
127 | #endif |
128 | ||
920e70c5 RK |
129 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
130 | mmc_hostname(host), mrq->cmd->opcode, | |
131 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 132 | |
e4d21708 PO |
133 | if (mrq->data) { |
134 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
135 | "tsac %d ms nsac %d\n", | |
136 | mmc_hostname(host), mrq->data->blksz, | |
137 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 138 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
139 | mrq->data->timeout_clks); |
140 | } | |
141 | ||
142 | if (mrq->stop) { | |
143 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
144 | mmc_hostname(host), mrq->stop->opcode, | |
145 | mrq->stop->arg, mrq->stop->flags); | |
146 | } | |
147 | ||
f22ee4ed | 148 | WARN_ON(!host->claimed); |
1da177e4 | 149 | |
af8350c7 PO |
150 | led_trigger_event(host->led, LED_FULL); |
151 | ||
1da177e4 LT |
152 | mrq->cmd->error = 0; |
153 | mrq->cmd->mrq = mrq; | |
154 | if (mrq->data) { | |
fe4a3c7a | 155 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
156 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
157 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
158 | host->max_req_size); | |
fe4a3c7a | 159 | |
976d9276 PO |
160 | #ifdef CONFIG_MMC_DEBUG |
161 | sz = 0; | |
a84756c5 PO |
162 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
163 | sz += sg->length; | |
976d9276 PO |
164 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
165 | #endif | |
166 | ||
1da177e4 LT |
167 | mrq->cmd->data = mrq->data; |
168 | mrq->data->error = 0; | |
169 | mrq->data->mrq = mrq; | |
170 | if (mrq->stop) { | |
171 | mrq->data->stop = mrq->stop; | |
172 | mrq->stop->error = 0; | |
173 | mrq->stop->mrq = mrq; | |
174 | } | |
175 | } | |
176 | host->ops->request(host, mrq); | |
177 | } | |
178 | ||
1da177e4 LT |
179 | static void mmc_wait_done(struct mmc_request *mrq) |
180 | { | |
181 | complete(mrq->done_data); | |
182 | } | |
183 | ||
67a61c48 PO |
184 | /** |
185 | * mmc_wait_for_req - start a request and wait for completion | |
186 | * @host: MMC host to start command | |
187 | * @mrq: MMC request to start | |
188 | * | |
189 | * Start a new MMC custom command request for a host, and wait | |
190 | * for the command to complete. Does not attempt to parse the | |
191 | * response. | |
192 | */ | |
193 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 194 | { |
0afffc72 | 195 | DECLARE_COMPLETION_ONSTACK(complete); |
1da177e4 LT |
196 | |
197 | mrq->done_data = &complete; | |
198 | mrq->done = mmc_wait_done; | |
199 | ||
200 | mmc_start_request(host, mrq); | |
201 | ||
202 | wait_for_completion(&complete); | |
1da177e4 LT |
203 | } |
204 | ||
205 | EXPORT_SYMBOL(mmc_wait_for_req); | |
206 | ||
207 | /** | |
208 | * mmc_wait_for_cmd - start a command and wait for completion | |
209 | * @host: MMC host to start command | |
210 | * @cmd: MMC command to start | |
211 | * @retries: maximum number of retries | |
212 | * | |
213 | * Start a new MMC command for a host, and wait for the command | |
214 | * to complete. Return any error that occurred while the command | |
215 | * was executing. Do not attempt to parse the response. | |
216 | */ | |
217 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
218 | { | |
219 | struct mmc_request mrq; | |
220 | ||
d84075c8 | 221 | WARN_ON(!host->claimed); |
1da177e4 LT |
222 | |
223 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
224 | ||
225 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
226 | cmd->retries = retries; | |
227 | ||
228 | mrq.cmd = cmd; | |
229 | cmd->data = NULL; | |
230 | ||
231 | mmc_wait_for_req(host, &mrq); | |
232 | ||
233 | return cmd->error; | |
234 | } | |
235 | ||
236 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
237 | ||
d773d725 RK |
238 | /** |
239 | * mmc_set_data_timeout - set the timeout for a data command | |
240 | * @data: data phase for command | |
241 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
242 | * |
243 | * Computes the data timeout parameters according to the | |
244 | * correct algorithm given the card type. | |
d773d725 | 245 | */ |
b146d26a | 246 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
247 | { |
248 | unsigned int mult; | |
249 | ||
e6f918bf PO |
250 | /* |
251 | * SDIO cards only define an upper 1 s limit on access. | |
252 | */ | |
253 | if (mmc_card_sdio(card)) { | |
254 | data->timeout_ns = 1000000000; | |
255 | data->timeout_clks = 0; | |
256 | return; | |
257 | } | |
258 | ||
d773d725 RK |
259 | /* |
260 | * SD cards use a 100 multiplier rather than 10 | |
261 | */ | |
262 | mult = mmc_card_sd(card) ? 100 : 10; | |
263 | ||
264 | /* | |
265 | * Scale up the multiplier (and therefore the timeout) by | |
266 | * the r2w factor for writes. | |
267 | */ | |
b146d26a | 268 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
269 | mult <<= card->csd.r2w_factor; |
270 | ||
271 | data->timeout_ns = card->csd.tacc_ns * mult; | |
272 | data->timeout_clks = card->csd.tacc_clks * mult; | |
273 | ||
274 | /* | |
275 | * SD cards also have an upper limit on the timeout. | |
276 | */ | |
277 | if (mmc_card_sd(card)) { | |
278 | unsigned int timeout_us, limit_us; | |
279 | ||
280 | timeout_us = data->timeout_ns / 1000; | |
281 | timeout_us += data->timeout_clks * 1000 / | |
282 | (card->host->ios.clock / 1000); | |
283 | ||
b146d26a | 284 | if (data->flags & MMC_DATA_WRITE) |
493890e7 PO |
285 | /* |
286 | * The limit is really 250 ms, but that is | |
287 | * insufficient for some crappy cards. | |
288 | */ | |
289 | limit_us = 300000; | |
d773d725 RK |
290 | else |
291 | limit_us = 100000; | |
292 | ||
fba68bd2 PL |
293 | /* |
294 | * SDHC cards always use these fixed values. | |
295 | */ | |
296 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
297 | data->timeout_ns = limit_us * 1000; |
298 | data->timeout_clks = 0; | |
299 | } | |
300 | } | |
c0c88871 WM |
301 | /* |
302 | * Some cards need very high timeouts if driven in SPI mode. | |
303 | * The worst observed timeout was 900ms after writing a | |
304 | * continuous stream of data until the internal logic | |
305 | * overflowed. | |
306 | */ | |
307 | if (mmc_host_is_spi(card->host)) { | |
308 | if (data->flags & MMC_DATA_WRITE) { | |
309 | if (data->timeout_ns < 1000000000) | |
310 | data->timeout_ns = 1000000000; /* 1s */ | |
311 | } else { | |
312 | if (data->timeout_ns < 100000000) | |
313 | data->timeout_ns = 100000000; /* 100ms */ | |
314 | } | |
315 | } | |
d773d725 RK |
316 | } |
317 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
318 | ||
ad3868b2 PO |
319 | /** |
320 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
321 | * @card: the MMC card associated with the data transfer | |
322 | * @sz: original transfer size | |
323 | * | |
324 | * Pads the original data size with a number of extra bytes in | |
325 | * order to avoid controller bugs and/or performance hits | |
326 | * (e.g. some controllers revert to PIO for certain sizes). | |
327 | * | |
328 | * Returns the improved size, which might be unmodified. | |
329 | * | |
330 | * Note that this function is only relevant when issuing a | |
331 | * single scatter gather entry. | |
332 | */ | |
333 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
334 | { | |
335 | /* | |
336 | * FIXME: We don't have a system for the controller to tell | |
337 | * the core about its problems yet, so for now we just 32-bit | |
338 | * align the size. | |
339 | */ | |
340 | sz = ((sz + 3) / 4) * 4; | |
341 | ||
342 | return sz; | |
343 | } | |
344 | EXPORT_SYMBOL(mmc_align_data_size); | |
345 | ||
8ea926b2 AH |
346 | /** |
347 | * mmc_host_enable - enable a host. | |
348 | * @host: mmc host to enable | |
349 | * | |
350 | * Hosts that support power saving can use the 'enable' and 'disable' | |
351 | * methods to exit and enter power saving states. For more information | |
352 | * see comments for struct mmc_host_ops. | |
353 | */ | |
354 | int mmc_host_enable(struct mmc_host *host) | |
355 | { | |
356 | if (!(host->caps & MMC_CAP_DISABLE)) | |
357 | return 0; | |
358 | ||
359 | if (host->en_dis_recurs) | |
360 | return 0; | |
361 | ||
362 | if (host->nesting_cnt++) | |
363 | return 0; | |
364 | ||
365 | cancel_delayed_work_sync(&host->disable); | |
366 | ||
367 | if (host->enabled) | |
368 | return 0; | |
369 | ||
370 | if (host->ops->enable) { | |
371 | int err; | |
372 | ||
373 | host->en_dis_recurs = 1; | |
374 | err = host->ops->enable(host); | |
375 | host->en_dis_recurs = 0; | |
376 | ||
377 | if (err) { | |
378 | pr_debug("%s: enable error %d\n", | |
379 | mmc_hostname(host), err); | |
380 | return err; | |
381 | } | |
382 | } | |
383 | host->enabled = 1; | |
384 | return 0; | |
385 | } | |
386 | EXPORT_SYMBOL(mmc_host_enable); | |
387 | ||
388 | static int mmc_host_do_disable(struct mmc_host *host, int lazy) | |
389 | { | |
390 | if (host->ops->disable) { | |
391 | int err; | |
392 | ||
393 | host->en_dis_recurs = 1; | |
394 | err = host->ops->disable(host, lazy); | |
395 | host->en_dis_recurs = 0; | |
396 | ||
397 | if (err < 0) { | |
398 | pr_debug("%s: disable error %d\n", | |
399 | mmc_hostname(host), err); | |
400 | return err; | |
401 | } | |
402 | if (err > 0) { | |
403 | unsigned long delay = msecs_to_jiffies(err); | |
404 | ||
405 | mmc_schedule_delayed_work(&host->disable, delay); | |
406 | } | |
407 | } | |
408 | host->enabled = 0; | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /** | |
413 | * mmc_host_disable - disable a host. | |
414 | * @host: mmc host to disable | |
415 | * | |
416 | * Hosts that support power saving can use the 'enable' and 'disable' | |
417 | * methods to exit and enter power saving states. For more information | |
418 | * see comments for struct mmc_host_ops. | |
419 | */ | |
420 | int mmc_host_disable(struct mmc_host *host) | |
421 | { | |
422 | int err; | |
423 | ||
424 | if (!(host->caps & MMC_CAP_DISABLE)) | |
425 | return 0; | |
426 | ||
427 | if (host->en_dis_recurs) | |
428 | return 0; | |
429 | ||
430 | if (--host->nesting_cnt) | |
431 | return 0; | |
432 | ||
433 | if (!host->enabled) | |
434 | return 0; | |
435 | ||
436 | err = mmc_host_do_disable(host, 0); | |
437 | return err; | |
438 | } | |
439 | EXPORT_SYMBOL(mmc_host_disable); | |
440 | ||
1da177e4 | 441 | /** |
2342f332 | 442 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 443 | * @host: mmc host to claim |
2342f332 | 444 | * @abort: whether or not the operation should be aborted |
1da177e4 | 445 | * |
2342f332 NP |
446 | * Claim a host for a set of operations. If @abort is non null and |
447 | * dereference a non-zero value then this will return prematurely with | |
448 | * that non-zero value without acquiring the lock. Returns zero | |
449 | * with the lock held otherwise. | |
1da177e4 | 450 | */ |
2342f332 | 451 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
452 | { |
453 | DECLARE_WAITQUEUE(wait, current); | |
454 | unsigned long flags; | |
2342f332 | 455 | int stop; |
1da177e4 | 456 | |
cf795bfb PO |
457 | might_sleep(); |
458 | ||
1da177e4 LT |
459 | add_wait_queue(&host->wq, &wait); |
460 | spin_lock_irqsave(&host->lock, flags); | |
461 | while (1) { | |
462 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 NP |
463 | stop = abort ? atomic_read(abort) : 0; |
464 | if (stop || !host->claimed) | |
1da177e4 LT |
465 | break; |
466 | spin_unlock_irqrestore(&host->lock, flags); | |
467 | schedule(); | |
468 | spin_lock_irqsave(&host->lock, flags); | |
469 | } | |
470 | set_current_state(TASK_RUNNING); | |
2342f332 NP |
471 | if (!stop) |
472 | host->claimed = 1; | |
473 | else | |
474 | wake_up(&host->wq); | |
1da177e4 LT |
475 | spin_unlock_irqrestore(&host->lock, flags); |
476 | remove_wait_queue(&host->wq, &wait); | |
8ea926b2 AH |
477 | if (!stop) |
478 | mmc_host_enable(host); | |
2342f332 | 479 | return stop; |
1da177e4 LT |
480 | } |
481 | ||
2342f332 | 482 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 483 | |
8ea926b2 AH |
484 | static int mmc_try_claim_host(struct mmc_host *host) |
485 | { | |
486 | int claimed_host = 0; | |
487 | unsigned long flags; | |
488 | ||
489 | spin_lock_irqsave(&host->lock, flags); | |
490 | if (!host->claimed) { | |
491 | host->claimed = 1; | |
492 | claimed_host = 1; | |
493 | } | |
494 | spin_unlock_irqrestore(&host->lock, flags); | |
495 | return claimed_host; | |
496 | } | |
497 | ||
498 | static void mmc_do_release_host(struct mmc_host *host) | |
499 | { | |
500 | unsigned long flags; | |
501 | ||
502 | spin_lock_irqsave(&host->lock, flags); | |
503 | host->claimed = 0; | |
504 | spin_unlock_irqrestore(&host->lock, flags); | |
505 | ||
506 | wake_up(&host->wq); | |
507 | } | |
508 | ||
509 | void mmc_host_deeper_disable(struct work_struct *work) | |
510 | { | |
511 | struct mmc_host *host = | |
512 | container_of(work, struct mmc_host, disable.work); | |
513 | ||
514 | /* If the host is claimed then we do not want to disable it anymore */ | |
515 | if (!mmc_try_claim_host(host)) | |
516 | return; | |
517 | mmc_host_do_disable(host, 1); | |
518 | mmc_do_release_host(host); | |
519 | } | |
520 | ||
521 | /** | |
522 | * mmc_host_lazy_disable - lazily disable a host. | |
523 | * @host: mmc host to disable | |
524 | * | |
525 | * Hosts that support power saving can use the 'enable' and 'disable' | |
526 | * methods to exit and enter power saving states. For more information | |
527 | * see comments for struct mmc_host_ops. | |
528 | */ | |
529 | int mmc_host_lazy_disable(struct mmc_host *host) | |
530 | { | |
531 | if (!(host->caps & MMC_CAP_DISABLE)) | |
532 | return 0; | |
533 | ||
534 | if (host->en_dis_recurs) | |
535 | return 0; | |
536 | ||
537 | if (--host->nesting_cnt) | |
538 | return 0; | |
539 | ||
540 | if (!host->enabled) | |
541 | return 0; | |
542 | ||
543 | if (host->disable_delay) { | |
544 | mmc_schedule_delayed_work(&host->disable, | |
545 | msecs_to_jiffies(host->disable_delay)); | |
546 | return 0; | |
547 | } else | |
548 | return mmc_host_do_disable(host, 1); | |
549 | } | |
550 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
551 | ||
1da177e4 LT |
552 | /** |
553 | * mmc_release_host - release a host | |
554 | * @host: mmc host to release | |
555 | * | |
556 | * Release a MMC host, allowing others to claim the host | |
557 | * for their operations. | |
558 | */ | |
559 | void mmc_release_host(struct mmc_host *host) | |
560 | { | |
d84075c8 | 561 | WARN_ON(!host->claimed); |
1da177e4 | 562 | |
8ea926b2 | 563 | mmc_host_lazy_disable(host); |
1da177e4 | 564 | |
8ea926b2 | 565 | mmc_do_release_host(host); |
1da177e4 LT |
566 | } |
567 | ||
568 | EXPORT_SYMBOL(mmc_release_host); | |
569 | ||
7ea239d9 PO |
570 | /* |
571 | * Internal function that does the actual ios call to the host driver, | |
572 | * optionally printing some debug output. | |
573 | */ | |
920e70c5 RK |
574 | static inline void mmc_set_ios(struct mmc_host *host) |
575 | { | |
576 | struct mmc_ios *ios = &host->ios; | |
577 | ||
cd9277c0 PO |
578 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
579 | "width %u timing %u\n", | |
920e70c5 RK |
580 | mmc_hostname(host), ios->clock, ios->bus_mode, |
581 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 582 | ios->bus_width, ios->timing); |
fba68bd2 | 583 | |
920e70c5 RK |
584 | host->ops->set_ios(host, ios); |
585 | } | |
586 | ||
7ea239d9 PO |
587 | /* |
588 | * Control chip select pin on a host. | |
589 | */ | |
da7fbe58 | 590 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 591 | { |
da7fbe58 PO |
592 | host->ios.chip_select = mode; |
593 | mmc_set_ios(host); | |
1da177e4 LT |
594 | } |
595 | ||
7ea239d9 PO |
596 | /* |
597 | * Sets the host clock to the highest possible frequency that | |
598 | * is below "hz". | |
599 | */ | |
600 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) | |
601 | { | |
602 | WARN_ON(hz < host->f_min); | |
603 | ||
604 | if (hz > host->f_max) | |
605 | hz = host->f_max; | |
606 | ||
607 | host->ios.clock = hz; | |
608 | mmc_set_ios(host); | |
609 | } | |
610 | ||
611 | /* | |
612 | * Change the bus mode (open drain/push-pull) of a host. | |
613 | */ | |
614 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
615 | { | |
616 | host->ios.bus_mode = mode; | |
617 | mmc_set_ios(host); | |
618 | } | |
619 | ||
620 | /* | |
621 | * Change data bus width of a host. | |
622 | */ | |
623 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
624 | { | |
625 | host->ios.bus_width = width; | |
626 | mmc_set_ios(host); | |
627 | } | |
628 | ||
86e8286a AV |
629 | /** |
630 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
631 | * @vdd: voltage (mV) | |
632 | * @low_bits: prefer low bits in boundary cases | |
633 | * | |
634 | * This function returns the OCR bit number according to the provided @vdd | |
635 | * value. If conversion is not possible a negative errno value returned. | |
636 | * | |
637 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
638 | * on boundary voltages. For example, | |
639 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
640 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
641 | * | |
642 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
643 | */ | |
644 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
645 | { | |
646 | const int max_bit = ilog2(MMC_VDD_35_36); | |
647 | int bit; | |
648 | ||
649 | if (vdd < 1650 || vdd > 3600) | |
650 | return -EINVAL; | |
651 | ||
652 | if (vdd >= 1650 && vdd <= 1950) | |
653 | return ilog2(MMC_VDD_165_195); | |
654 | ||
655 | if (low_bits) | |
656 | vdd -= 1; | |
657 | ||
658 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
659 | bit = (vdd - 2000) / 100 + 8; | |
660 | if (bit > max_bit) | |
661 | return max_bit; | |
662 | return bit; | |
663 | } | |
664 | ||
665 | /** | |
666 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
667 | * @vdd_min: minimum voltage value (mV) | |
668 | * @vdd_max: maximum voltage value (mV) | |
669 | * | |
670 | * This function returns the OCR mask bits according to the provided @vdd_min | |
671 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
672 | * | |
673 | * Notes wrt boundary cases: | |
674 | * This function sets the OCR bits for all boundary voltages, for example | |
675 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
676 | * MMC_VDD_34_35 mask. | |
677 | */ | |
678 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
679 | { | |
680 | u32 mask = 0; | |
681 | ||
682 | if (vdd_max < vdd_min) | |
683 | return 0; | |
684 | ||
685 | /* Prefer high bits for the boundary vdd_max values. */ | |
686 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
687 | if (vdd_max < 0) | |
688 | return 0; | |
689 | ||
690 | /* Prefer low bits for the boundary vdd_min values. */ | |
691 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
692 | if (vdd_min < 0) | |
693 | return 0; | |
694 | ||
695 | /* Fill the mask, from max bit to min bit. */ | |
696 | while (vdd_max >= vdd_min) | |
697 | mask |= 1 << vdd_max--; | |
698 | ||
699 | return mask; | |
700 | } | |
701 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
702 | ||
5c13941a DB |
703 | #ifdef CONFIG_REGULATOR |
704 | ||
705 | /** | |
706 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
707 | * @supply: regulator to use | |
708 | * | |
709 | * This returns either a negative errno, or a mask of voltages that | |
710 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
711 | * regulator. This would normally be called before registering the | |
712 | * MMC host adapter. | |
713 | */ | |
714 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
715 | { | |
716 | int result = 0; | |
717 | int count; | |
718 | int i; | |
719 | ||
720 | count = regulator_count_voltages(supply); | |
721 | if (count < 0) | |
722 | return count; | |
723 | ||
724 | for (i = 0; i < count; i++) { | |
725 | int vdd_uV; | |
726 | int vdd_mV; | |
727 | ||
728 | vdd_uV = regulator_list_voltage(supply, i); | |
729 | if (vdd_uV <= 0) | |
730 | continue; | |
731 | ||
732 | vdd_mV = vdd_uV / 1000; | |
733 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
734 | } | |
735 | ||
736 | return result; | |
737 | } | |
738 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
739 | ||
740 | /** | |
741 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
742 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) | |
743 | * @supply: regulator to use | |
744 | * | |
745 | * Returns zero on success, else negative errno. | |
746 | * | |
747 | * MMC host drivers may use this to enable or disable a regulator using | |
748 | * a particular supply voltage. This would normally be called from the | |
749 | * set_ios() method. | |
750 | */ | |
751 | int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit) | |
752 | { | |
753 | int result = 0; | |
754 | int min_uV, max_uV; | |
755 | int enabled; | |
756 | ||
757 | enabled = regulator_is_enabled(supply); | |
758 | if (enabled < 0) | |
759 | return enabled; | |
760 | ||
761 | if (vdd_bit) { | |
762 | int tmp; | |
763 | int voltage; | |
764 | ||
765 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
766 | * bits this regulator doesn't quite support ... don't | |
767 | * be too picky, most cards and regulators are OK with | |
768 | * a 0.1V range goof (it's a small error percentage). | |
769 | */ | |
770 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
771 | if (tmp == 0) { | |
772 | min_uV = 1650 * 1000; | |
773 | max_uV = 1950 * 1000; | |
774 | } else { | |
775 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
776 | max_uV = min_uV + 100 * 1000; | |
777 | } | |
778 | ||
779 | /* avoid needless changes to this voltage; the regulator | |
780 | * might not allow this operation | |
781 | */ | |
782 | voltage = regulator_get_voltage(supply); | |
783 | if (voltage < 0) | |
784 | result = voltage; | |
785 | else if (voltage < min_uV || voltage > max_uV) | |
786 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
787 | else | |
788 | result = 0; | |
789 | ||
790 | if (result == 0 && !enabled) | |
791 | result = regulator_enable(supply); | |
792 | } else if (enabled) { | |
793 | result = regulator_disable(supply); | |
794 | } | |
795 | ||
796 | return result; | |
797 | } | |
798 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
799 | ||
800 | #endif | |
801 | ||
1da177e4 LT |
802 | /* |
803 | * Mask off any voltages we don't support and select | |
804 | * the lowest voltage | |
805 | */ | |
7ea239d9 | 806 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
807 | { |
808 | int bit; | |
809 | ||
810 | ocr &= host->ocr_avail; | |
811 | ||
812 | bit = ffs(ocr); | |
813 | if (bit) { | |
814 | bit -= 1; | |
815 | ||
63ef731a | 816 | ocr &= 3 << bit; |
1da177e4 LT |
817 | |
818 | host->ios.vdd = bit; | |
920e70c5 | 819 | mmc_set_ios(host); |
1da177e4 | 820 | } else { |
f6e10b86 DB |
821 | pr_warning("%s: host doesn't support card's voltages\n", |
822 | mmc_hostname(host)); | |
1da177e4 LT |
823 | ocr = 0; |
824 | } | |
825 | ||
826 | return ocr; | |
827 | } | |
828 | ||
b57c43ad | 829 | /* |
7ea239d9 | 830 | * Select timing parameters for host. |
b57c43ad | 831 | */ |
7ea239d9 | 832 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 833 | { |
7ea239d9 PO |
834 | host->ios.timing = timing; |
835 | mmc_set_ios(host); | |
b57c43ad PO |
836 | } |
837 | ||
1da177e4 | 838 | /* |
45f8245b RK |
839 | * Apply power to the MMC stack. This is a two-stage process. |
840 | * First, we enable power to the card without the clock running. | |
841 | * We then wait a bit for the power to stabilise. Finally, | |
842 | * enable the bus drivers and clock to the card. | |
843 | * | |
844 | * We must _NOT_ enable the clock prior to power stablising. | |
845 | * | |
846 | * If a host does all the power sequencing itself, ignore the | |
847 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
848 | */ |
849 | static void mmc_power_up(struct mmc_host *host) | |
850 | { | |
500f3564 BR |
851 | int bit; |
852 | ||
853 | /* If ocr is set, we use it */ | |
854 | if (host->ocr) | |
855 | bit = ffs(host->ocr) - 1; | |
856 | else | |
857 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
858 | |
859 | host->ios.vdd = bit; | |
af517150 DB |
860 | if (mmc_host_is_spi(host)) { |
861 | host->ios.chip_select = MMC_CS_HIGH; | |
862 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
863 | } else { | |
864 | host->ios.chip_select = MMC_CS_DONTCARE; | |
865 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
866 | } | |
1da177e4 | 867 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 868 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 869 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 870 | mmc_set_ios(host); |
1da177e4 | 871 | |
f9996aee PO |
872 | /* |
873 | * This delay should be sufficient to allow the power supply | |
874 | * to reach the minimum voltage. | |
875 | */ | |
79bccc5a | 876 | mmc_delay(10); |
1da177e4 | 877 | |
8dfd0374 SH |
878 | if (host->f_min > 400000) { |
879 | pr_warning("%s: Minimum clock frequency too high for " | |
880 | "identification mode\n", mmc_hostname(host)); | |
881 | host->ios.clock = host->f_min; | |
882 | } else | |
883 | host->ios.clock = 400000; | |
884 | ||
1da177e4 | 885 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 886 | mmc_set_ios(host); |
1da177e4 | 887 | |
f9996aee PO |
888 | /* |
889 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
890 | * time required to reach a stable voltage. | |
891 | */ | |
79bccc5a | 892 | mmc_delay(10); |
1da177e4 LT |
893 | } |
894 | ||
895 | static void mmc_power_off(struct mmc_host *host) | |
896 | { | |
897 | host->ios.clock = 0; | |
898 | host->ios.vdd = 0; | |
af517150 DB |
899 | if (!mmc_host_is_spi(host)) { |
900 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
901 | host->ios.chip_select = MMC_CS_DONTCARE; | |
902 | } | |
1da177e4 | 903 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 904 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 905 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 906 | mmc_set_ios(host); |
1da177e4 LT |
907 | } |
908 | ||
39361851 AB |
909 | /* |
910 | * Cleanup when the last reference to the bus operator is dropped. | |
911 | */ | |
261172fd | 912 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
913 | { |
914 | BUG_ON(!host); | |
915 | BUG_ON(host->bus_refs); | |
916 | BUG_ON(!host->bus_dead); | |
917 | ||
918 | host->bus_ops = NULL; | |
919 | } | |
920 | ||
921 | /* | |
922 | * Increase reference count of bus operator | |
923 | */ | |
924 | static inline void mmc_bus_get(struct mmc_host *host) | |
925 | { | |
926 | unsigned long flags; | |
927 | ||
928 | spin_lock_irqsave(&host->lock, flags); | |
929 | host->bus_refs++; | |
930 | spin_unlock_irqrestore(&host->lock, flags); | |
931 | } | |
932 | ||
933 | /* | |
934 | * Decrease reference count of bus operator and free it if | |
935 | * it is the last reference. | |
936 | */ | |
937 | static inline void mmc_bus_put(struct mmc_host *host) | |
938 | { | |
939 | unsigned long flags; | |
940 | ||
941 | spin_lock_irqsave(&host->lock, flags); | |
942 | host->bus_refs--; | |
943 | if ((host->bus_refs == 0) && host->bus_ops) | |
944 | __mmc_release_bus(host); | |
945 | spin_unlock_irqrestore(&host->lock, flags); | |
946 | } | |
947 | ||
1da177e4 | 948 | /* |
7ea239d9 PO |
949 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
950 | * host at any given time. | |
1da177e4 | 951 | */ |
7ea239d9 | 952 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 953 | { |
7ea239d9 | 954 | unsigned long flags; |
e45a1bd2 | 955 | |
7ea239d9 PO |
956 | BUG_ON(!host); |
957 | BUG_ON(!ops); | |
b855885e | 958 | |
d84075c8 | 959 | WARN_ON(!host->claimed); |
bce40a36 | 960 | |
7ea239d9 | 961 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 962 | |
7ea239d9 PO |
963 | BUG_ON(host->bus_ops); |
964 | BUG_ON(host->bus_refs); | |
b57c43ad | 965 | |
7ea239d9 PO |
966 | host->bus_ops = ops; |
967 | host->bus_refs = 1; | |
968 | host->bus_dead = 0; | |
b57c43ad | 969 | |
7ea239d9 | 970 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
971 | } |
972 | ||
7ea239d9 PO |
973 | /* |
974 | * Remove the current bus handler from a host. Assumes that there are | |
975 | * no interesting cards left, so the bus is powered down. | |
976 | */ | |
977 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 978 | { |
7ea239d9 | 979 | unsigned long flags; |
7ccd266e | 980 | |
7ea239d9 | 981 | BUG_ON(!host); |
7ccd266e | 982 | |
d84075c8 PO |
983 | WARN_ON(!host->claimed); |
984 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 985 | |
7ea239d9 | 986 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 987 | |
7ea239d9 | 988 | host->bus_dead = 1; |
7ccd266e | 989 | |
7ea239d9 | 990 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 991 | |
7ea239d9 | 992 | mmc_power_off(host); |
1da177e4 | 993 | |
7ea239d9 | 994 | mmc_bus_put(host); |
1da177e4 LT |
995 | } |
996 | ||
1da177e4 LT |
997 | /** |
998 | * mmc_detect_change - process change of state on a MMC socket | |
999 | * @host: host which changed state. | |
8dc00335 | 1000 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1001 | * |
67a61c48 PO |
1002 | * MMC drivers should call this when they detect a card has been |
1003 | * inserted or removed. The MMC layer will confirm that any | |
1004 | * present card is still functional, and initialize any newly | |
1005 | * inserted. | |
1da177e4 | 1006 | */ |
8dc00335 | 1007 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1008 | { |
3b91e550 | 1009 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1010 | unsigned long flags; |
01f41ec7 | 1011 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1012 | WARN_ON(host->removed); |
01f41ec7 | 1013 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1014 | #endif |
1015 | ||
c4028958 | 1016 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | EXPORT_SYMBOL(mmc_detect_change); | |
1020 | ||
1021 | ||
b93931a6 | 1022 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 1023 | { |
c4028958 DH |
1024 | struct mmc_host *host = |
1025 | container_of(work, struct mmc_host, detect.work); | |
7ea239d9 PO |
1026 | u32 ocr; |
1027 | int err; | |
1da177e4 | 1028 | |
7ea239d9 | 1029 | mmc_bus_get(host); |
b855885e | 1030 | |
94d89efb JS |
1031 | /* if there is a card registered, check whether it is still present */ |
1032 | if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead) | |
1033 | host->bus_ops->detect(host); | |
1034 | ||
1035 | mmc_bus_put(host); | |
1036 | ||
1037 | ||
1038 | mmc_bus_get(host); | |
1039 | ||
1040 | /* if there still is a card present, stop here */ | |
1041 | if (host->bus_ops != NULL) { | |
7ea239d9 | 1042 | mmc_bus_put(host); |
94d89efb JS |
1043 | goto out; |
1044 | } | |
1da177e4 | 1045 | |
94d89efb | 1046 | /* detect a newly inserted card */ |
28f52482 | 1047 | |
94d89efb JS |
1048 | /* |
1049 | * Only we can add a new handler, so it's safe to | |
1050 | * release the lock here. | |
1051 | */ | |
1052 | mmc_bus_put(host); | |
1da177e4 | 1053 | |
94d89efb JS |
1054 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
1055 | goto out; | |
1da177e4 | 1056 | |
94d89efb | 1057 | mmc_claim_host(host); |
1da177e4 | 1058 | |
94d89efb JS |
1059 | mmc_power_up(host); |
1060 | mmc_go_idle(host); | |
5c4e6f13 | 1061 | |
94d89efb | 1062 | mmc_send_if_cond(host, host->ocr_avail); |
5c4e6f13 | 1063 | |
94d89efb JS |
1064 | /* |
1065 | * First we search for SDIO... | |
1066 | */ | |
1067 | err = mmc_send_io_op_cond(host, 0, &ocr); | |
1068 | if (!err) { | |
1069 | if (mmc_attach_sdio(host, ocr)) | |
1070 | mmc_power_off(host); | |
1071 | goto out; | |
1072 | } | |
5c4e6f13 | 1073 | |
94d89efb JS |
1074 | /* |
1075 | * ...then normal SD... | |
1076 | */ | |
1077 | err = mmc_send_app_op_cond(host, 0, &ocr); | |
1078 | if (!err) { | |
1079 | if (mmc_attach_sd(host, ocr)) | |
1080 | mmc_power_off(host); | |
1081 | goto out; | |
1082 | } | |
7ea239d9 | 1083 | |
94d89efb JS |
1084 | /* |
1085 | * ...and finally MMC. | |
1086 | */ | |
1087 | err = mmc_send_op_cond(host, 0, &ocr); | |
1088 | if (!err) { | |
1089 | if (mmc_attach_mmc(host, ocr)) | |
1090 | mmc_power_off(host); | |
1091 | goto out; | |
7ea239d9 | 1092 | } |
94d89efb JS |
1093 | |
1094 | mmc_release_host(host); | |
1095 | mmc_power_off(host); | |
1096 | ||
28f52482 AV |
1097 | out: |
1098 | if (host->caps & MMC_CAP_NEEDS_POLL) | |
1099 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
1100 | } |
1101 | ||
b93931a6 | 1102 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 1103 | { |
b93931a6 PO |
1104 | mmc_power_off(host); |
1105 | mmc_detect_change(host, 0); | |
1da177e4 LT |
1106 | } |
1107 | ||
b93931a6 | 1108 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 1109 | { |
3b91e550 | 1110 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
1111 | unsigned long flags; |
1112 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 1113 | host->removed = 1; |
1efd48b3 | 1114 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1115 | #endif |
1116 | ||
8ea926b2 AH |
1117 | if (host->caps & MMC_CAP_DISABLE) |
1118 | cancel_delayed_work(&host->disable); | |
7de427d0 | 1119 | cancel_delayed_work(&host->detect); |
3b91e550 PO |
1120 | mmc_flush_scheduled_work(); |
1121 | ||
7ea239d9 PO |
1122 | mmc_bus_get(host); |
1123 | if (host->bus_ops && !host->bus_dead) { | |
1124 | if (host->bus_ops->remove) | |
1125 | host->bus_ops->remove(host); | |
1126 | ||
1127 | mmc_claim_host(host); | |
1128 | mmc_detach_bus(host); | |
1129 | mmc_release_host(host); | |
1da177e4 | 1130 | } |
7ea239d9 PO |
1131 | mmc_bus_put(host); |
1132 | ||
1133 | BUG_ON(host->card); | |
1da177e4 LT |
1134 | |
1135 | mmc_power_off(host); | |
1136 | } | |
1137 | ||
1da177e4 LT |
1138 | #ifdef CONFIG_PM |
1139 | ||
1140 | /** | |
1141 | * mmc_suspend_host - suspend a host | |
1142 | * @host: mmc host | |
1143 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1144 | */ | |
e5378ca8 | 1145 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 | 1146 | { |
8ea926b2 AH |
1147 | if (host->caps & MMC_CAP_DISABLE) |
1148 | cancel_delayed_work(&host->disable); | |
7de427d0 | 1149 | cancel_delayed_work(&host->detect); |
b5af25be PO |
1150 | mmc_flush_scheduled_work(); |
1151 | ||
7ea239d9 PO |
1152 | mmc_bus_get(host); |
1153 | if (host->bus_ops && !host->bus_dead) { | |
6abaa0c9 PO |
1154 | if (host->bus_ops->suspend) |
1155 | host->bus_ops->suspend(host); | |
1156 | if (!host->bus_ops->resume) { | |
1157 | if (host->bus_ops->remove) | |
1158 | host->bus_ops->remove(host); | |
1159 | ||
1160 | mmc_claim_host(host); | |
1161 | mmc_detach_bus(host); | |
1162 | mmc_release_host(host); | |
1163 | } | |
b5af25be | 1164 | } |
7ea239d9 PO |
1165 | mmc_bus_put(host); |
1166 | ||
1da177e4 | 1167 | mmc_power_off(host); |
1da177e4 LT |
1168 | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | EXPORT_SYMBOL(mmc_suspend_host); | |
1173 | ||
1174 | /** | |
1175 | * mmc_resume_host - resume a previously suspended host | |
1176 | * @host: mmc host | |
1177 | */ | |
1178 | int mmc_resume_host(struct mmc_host *host) | |
1179 | { | |
6abaa0c9 PO |
1180 | mmc_bus_get(host); |
1181 | if (host->bus_ops && !host->bus_dead) { | |
1182 | mmc_power_up(host); | |
d3096f88 | 1183 | mmc_select_voltage(host, host->ocr); |
6abaa0c9 PO |
1184 | BUG_ON(!host->bus_ops->resume); |
1185 | host->bus_ops->resume(host); | |
1186 | } | |
1187 | mmc_bus_put(host); | |
1188 | ||
1189 | /* | |
1190 | * We add a slight delay here so that resume can progress | |
1191 | * in parallel. | |
1192 | */ | |
1193 | mmc_detect_change(host, 1); | |
1da177e4 LT |
1194 | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | EXPORT_SYMBOL(mmc_resume_host); | |
1199 | ||
1200 | #endif | |
1201 | ||
ffce2e7e PO |
1202 | static int __init mmc_init(void) |
1203 | { | |
1204 | int ret; | |
1205 | ||
1206 | workqueue = create_singlethread_workqueue("kmmcd"); | |
1207 | if (!workqueue) | |
1208 | return -ENOMEM; | |
1209 | ||
1210 | ret = mmc_register_bus(); | |
e29a7d73 PO |
1211 | if (ret) |
1212 | goto destroy_workqueue; | |
1213 | ||
1214 | ret = mmc_register_host_class(); | |
1215 | if (ret) | |
1216 | goto unregister_bus; | |
1217 | ||
1218 | ret = sdio_register_bus(); | |
1219 | if (ret) | |
1220 | goto unregister_host_class; | |
1221 | ||
1222 | return 0; | |
1223 | ||
1224 | unregister_host_class: | |
1225 | mmc_unregister_host_class(); | |
1226 | unregister_bus: | |
1227 | mmc_unregister_bus(); | |
1228 | destroy_workqueue: | |
1229 | destroy_workqueue(workqueue); | |
1230 | ||
ffce2e7e PO |
1231 | return ret; |
1232 | } | |
1233 | ||
1234 | static void __exit mmc_exit(void) | |
1235 | { | |
e29a7d73 | 1236 | sdio_unregister_bus(); |
ffce2e7e PO |
1237 | mmc_unregister_host_class(); |
1238 | mmc_unregister_bus(); | |
1239 | destroy_workqueue(workqueue); | |
1240 | } | |
1241 | ||
26074962 | 1242 | subsys_initcall(mmc_init); |
ffce2e7e PO |
1243 | module_exit(mmc_exit); |
1244 | ||
1da177e4 | 1245 | MODULE_LICENSE("GPL"); |