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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 | 463 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 464 | if (stop || !host->claimed || host->claimer == current) |
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); | |
319a3f14 | 471 | if (!stop) { |
2342f332 | 472 | host->claimed = 1; |
319a3f14 AH |
473 | host->claimer = current; |
474 | host->claim_cnt += 1; | |
475 | } else | |
2342f332 | 476 | wake_up(&host->wq); |
1da177e4 LT |
477 | spin_unlock_irqrestore(&host->lock, flags); |
478 | remove_wait_queue(&host->wq, &wait); | |
8ea926b2 AH |
479 | if (!stop) |
480 | mmc_host_enable(host); | |
2342f332 | 481 | return stop; |
1da177e4 LT |
482 | } |
483 | ||
2342f332 | 484 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 485 | |
319a3f14 AH |
486 | /** |
487 | * mmc_try_claim_host - try exclusively to claim a host | |
488 | * @host: mmc host to claim | |
489 | * | |
490 | * Returns %1 if the host is claimed, %0 otherwise. | |
491 | */ | |
492 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
493 | { |
494 | int claimed_host = 0; | |
495 | unsigned long flags; | |
496 | ||
497 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 498 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 499 | host->claimed = 1; |
319a3f14 AH |
500 | host->claimer = current; |
501 | host->claim_cnt += 1; | |
8ea926b2 AH |
502 | claimed_host = 1; |
503 | } | |
504 | spin_unlock_irqrestore(&host->lock, flags); | |
505 | return claimed_host; | |
506 | } | |
319a3f14 | 507 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 AH |
508 | |
509 | static void mmc_do_release_host(struct mmc_host *host) | |
510 | { | |
511 | unsigned long flags; | |
512 | ||
513 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 AH |
514 | if (--host->claim_cnt) { |
515 | /* Release for nested claim */ | |
516 | spin_unlock_irqrestore(&host->lock, flags); | |
517 | } else { | |
518 | host->claimed = 0; | |
519 | host->claimer = NULL; | |
520 | spin_unlock_irqrestore(&host->lock, flags); | |
521 | wake_up(&host->wq); | |
522 | } | |
8ea926b2 AH |
523 | } |
524 | ||
525 | void mmc_host_deeper_disable(struct work_struct *work) | |
526 | { | |
527 | struct mmc_host *host = | |
528 | container_of(work, struct mmc_host, disable.work); | |
529 | ||
530 | /* If the host is claimed then we do not want to disable it anymore */ | |
531 | if (!mmc_try_claim_host(host)) | |
532 | return; | |
533 | mmc_host_do_disable(host, 1); | |
534 | mmc_do_release_host(host); | |
535 | } | |
536 | ||
537 | /** | |
538 | * mmc_host_lazy_disable - lazily disable a host. | |
539 | * @host: mmc host to disable | |
540 | * | |
541 | * Hosts that support power saving can use the 'enable' and 'disable' | |
542 | * methods to exit and enter power saving states. For more information | |
543 | * see comments for struct mmc_host_ops. | |
544 | */ | |
545 | int mmc_host_lazy_disable(struct mmc_host *host) | |
546 | { | |
547 | if (!(host->caps & MMC_CAP_DISABLE)) | |
548 | return 0; | |
549 | ||
550 | if (host->en_dis_recurs) | |
551 | return 0; | |
552 | ||
553 | if (--host->nesting_cnt) | |
554 | return 0; | |
555 | ||
556 | if (!host->enabled) | |
557 | return 0; | |
558 | ||
559 | if (host->disable_delay) { | |
560 | mmc_schedule_delayed_work(&host->disable, | |
561 | msecs_to_jiffies(host->disable_delay)); | |
562 | return 0; | |
563 | } else | |
564 | return mmc_host_do_disable(host, 1); | |
565 | } | |
566 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
567 | ||
1da177e4 LT |
568 | /** |
569 | * mmc_release_host - release a host | |
570 | * @host: mmc host to release | |
571 | * | |
572 | * Release a MMC host, allowing others to claim the host | |
573 | * for their operations. | |
574 | */ | |
575 | void mmc_release_host(struct mmc_host *host) | |
576 | { | |
d84075c8 | 577 | WARN_ON(!host->claimed); |
1da177e4 | 578 | |
8ea926b2 | 579 | mmc_host_lazy_disable(host); |
1da177e4 | 580 | |
8ea926b2 | 581 | mmc_do_release_host(host); |
1da177e4 LT |
582 | } |
583 | ||
584 | EXPORT_SYMBOL(mmc_release_host); | |
585 | ||
7ea239d9 PO |
586 | /* |
587 | * Internal function that does the actual ios call to the host driver, | |
588 | * optionally printing some debug output. | |
589 | */ | |
920e70c5 RK |
590 | static inline void mmc_set_ios(struct mmc_host *host) |
591 | { | |
592 | struct mmc_ios *ios = &host->ios; | |
593 | ||
cd9277c0 PO |
594 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
595 | "width %u timing %u\n", | |
920e70c5 RK |
596 | mmc_hostname(host), ios->clock, ios->bus_mode, |
597 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 598 | ios->bus_width, ios->timing); |
fba68bd2 | 599 | |
920e70c5 RK |
600 | host->ops->set_ios(host, ios); |
601 | } | |
602 | ||
7ea239d9 PO |
603 | /* |
604 | * Control chip select pin on a host. | |
605 | */ | |
da7fbe58 | 606 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 607 | { |
da7fbe58 PO |
608 | host->ios.chip_select = mode; |
609 | mmc_set_ios(host); | |
1da177e4 LT |
610 | } |
611 | ||
7ea239d9 PO |
612 | /* |
613 | * Sets the host clock to the highest possible frequency that | |
614 | * is below "hz". | |
615 | */ | |
616 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) | |
617 | { | |
618 | WARN_ON(hz < host->f_min); | |
619 | ||
620 | if (hz > host->f_max) | |
621 | hz = host->f_max; | |
622 | ||
623 | host->ios.clock = hz; | |
624 | mmc_set_ios(host); | |
625 | } | |
626 | ||
627 | /* | |
628 | * Change the bus mode (open drain/push-pull) of a host. | |
629 | */ | |
630 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
631 | { | |
632 | host->ios.bus_mode = mode; | |
633 | mmc_set_ios(host); | |
634 | } | |
635 | ||
636 | /* | |
637 | * Change data bus width of a host. | |
638 | */ | |
639 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
640 | { | |
641 | host->ios.bus_width = width; | |
642 | mmc_set_ios(host); | |
643 | } | |
644 | ||
86e8286a AV |
645 | /** |
646 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
647 | * @vdd: voltage (mV) | |
648 | * @low_bits: prefer low bits in boundary cases | |
649 | * | |
650 | * This function returns the OCR bit number according to the provided @vdd | |
651 | * value. If conversion is not possible a negative errno value returned. | |
652 | * | |
653 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
654 | * on boundary voltages. For example, | |
655 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
656 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
657 | * | |
658 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
659 | */ | |
660 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
661 | { | |
662 | const int max_bit = ilog2(MMC_VDD_35_36); | |
663 | int bit; | |
664 | ||
665 | if (vdd < 1650 || vdd > 3600) | |
666 | return -EINVAL; | |
667 | ||
668 | if (vdd >= 1650 && vdd <= 1950) | |
669 | return ilog2(MMC_VDD_165_195); | |
670 | ||
671 | if (low_bits) | |
672 | vdd -= 1; | |
673 | ||
674 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
675 | bit = (vdd - 2000) / 100 + 8; | |
676 | if (bit > max_bit) | |
677 | return max_bit; | |
678 | return bit; | |
679 | } | |
680 | ||
681 | /** | |
682 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
683 | * @vdd_min: minimum voltage value (mV) | |
684 | * @vdd_max: maximum voltage value (mV) | |
685 | * | |
686 | * This function returns the OCR mask bits according to the provided @vdd_min | |
687 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
688 | * | |
689 | * Notes wrt boundary cases: | |
690 | * This function sets the OCR bits for all boundary voltages, for example | |
691 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
692 | * MMC_VDD_34_35 mask. | |
693 | */ | |
694 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
695 | { | |
696 | u32 mask = 0; | |
697 | ||
698 | if (vdd_max < vdd_min) | |
699 | return 0; | |
700 | ||
701 | /* Prefer high bits for the boundary vdd_max values. */ | |
702 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
703 | if (vdd_max < 0) | |
704 | return 0; | |
705 | ||
706 | /* Prefer low bits for the boundary vdd_min values. */ | |
707 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
708 | if (vdd_min < 0) | |
709 | return 0; | |
710 | ||
711 | /* Fill the mask, from max bit to min bit. */ | |
712 | while (vdd_max >= vdd_min) | |
713 | mask |= 1 << vdd_max--; | |
714 | ||
715 | return mask; | |
716 | } | |
717 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
718 | ||
5c13941a DB |
719 | #ifdef CONFIG_REGULATOR |
720 | ||
721 | /** | |
722 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
723 | * @supply: regulator to use | |
724 | * | |
725 | * This returns either a negative errno, or a mask of voltages that | |
726 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
727 | * regulator. This would normally be called before registering the | |
728 | * MMC host adapter. | |
729 | */ | |
730 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
731 | { | |
732 | int result = 0; | |
733 | int count; | |
734 | int i; | |
735 | ||
736 | count = regulator_count_voltages(supply); | |
737 | if (count < 0) | |
738 | return count; | |
739 | ||
740 | for (i = 0; i < count; i++) { | |
741 | int vdd_uV; | |
742 | int vdd_mV; | |
743 | ||
744 | vdd_uV = regulator_list_voltage(supply, i); | |
745 | if (vdd_uV <= 0) | |
746 | continue; | |
747 | ||
748 | vdd_mV = vdd_uV / 1000; | |
749 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
750 | } | |
751 | ||
752 | return result; | |
753 | } | |
754 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
755 | ||
756 | /** | |
757 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
758 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) | |
759 | * @supply: regulator to use | |
760 | * | |
761 | * Returns zero on success, else negative errno. | |
762 | * | |
763 | * MMC host drivers may use this to enable or disable a regulator using | |
764 | * a particular supply voltage. This would normally be called from the | |
765 | * set_ios() method. | |
766 | */ | |
767 | int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit) | |
768 | { | |
769 | int result = 0; | |
770 | int min_uV, max_uV; | |
771 | int enabled; | |
772 | ||
773 | enabled = regulator_is_enabled(supply); | |
774 | if (enabled < 0) | |
775 | return enabled; | |
776 | ||
777 | if (vdd_bit) { | |
778 | int tmp; | |
779 | int voltage; | |
780 | ||
781 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
782 | * bits this regulator doesn't quite support ... don't | |
783 | * be too picky, most cards and regulators are OK with | |
784 | * a 0.1V range goof (it's a small error percentage). | |
785 | */ | |
786 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
787 | if (tmp == 0) { | |
788 | min_uV = 1650 * 1000; | |
789 | max_uV = 1950 * 1000; | |
790 | } else { | |
791 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
792 | max_uV = min_uV + 100 * 1000; | |
793 | } | |
794 | ||
795 | /* avoid needless changes to this voltage; the regulator | |
796 | * might not allow this operation | |
797 | */ | |
798 | voltage = regulator_get_voltage(supply); | |
799 | if (voltage < 0) | |
800 | result = voltage; | |
801 | else if (voltage < min_uV || voltage > max_uV) | |
802 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
803 | else | |
804 | result = 0; | |
805 | ||
806 | if (result == 0 && !enabled) | |
807 | result = regulator_enable(supply); | |
808 | } else if (enabled) { | |
809 | result = regulator_disable(supply); | |
810 | } | |
811 | ||
812 | return result; | |
813 | } | |
814 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
815 | ||
816 | #endif | |
817 | ||
1da177e4 LT |
818 | /* |
819 | * Mask off any voltages we don't support and select | |
820 | * the lowest voltage | |
821 | */ | |
7ea239d9 | 822 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
823 | { |
824 | int bit; | |
825 | ||
826 | ocr &= host->ocr_avail; | |
827 | ||
828 | bit = ffs(ocr); | |
829 | if (bit) { | |
830 | bit -= 1; | |
831 | ||
63ef731a | 832 | ocr &= 3 << bit; |
1da177e4 LT |
833 | |
834 | host->ios.vdd = bit; | |
920e70c5 | 835 | mmc_set_ios(host); |
1da177e4 | 836 | } else { |
f6e10b86 DB |
837 | pr_warning("%s: host doesn't support card's voltages\n", |
838 | mmc_hostname(host)); | |
1da177e4 LT |
839 | ocr = 0; |
840 | } | |
841 | ||
842 | return ocr; | |
843 | } | |
844 | ||
b57c43ad | 845 | /* |
7ea239d9 | 846 | * Select timing parameters for host. |
b57c43ad | 847 | */ |
7ea239d9 | 848 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 849 | { |
7ea239d9 PO |
850 | host->ios.timing = timing; |
851 | mmc_set_ios(host); | |
b57c43ad PO |
852 | } |
853 | ||
1da177e4 | 854 | /* |
45f8245b RK |
855 | * Apply power to the MMC stack. This is a two-stage process. |
856 | * First, we enable power to the card without the clock running. | |
857 | * We then wait a bit for the power to stabilise. Finally, | |
858 | * enable the bus drivers and clock to the card. | |
859 | * | |
860 | * We must _NOT_ enable the clock prior to power stablising. | |
861 | * | |
862 | * If a host does all the power sequencing itself, ignore the | |
863 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
864 | */ |
865 | static void mmc_power_up(struct mmc_host *host) | |
866 | { | |
500f3564 BR |
867 | int bit; |
868 | ||
869 | /* If ocr is set, we use it */ | |
870 | if (host->ocr) | |
871 | bit = ffs(host->ocr) - 1; | |
872 | else | |
873 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
874 | |
875 | host->ios.vdd = bit; | |
af517150 DB |
876 | if (mmc_host_is_spi(host)) { |
877 | host->ios.chip_select = MMC_CS_HIGH; | |
878 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
879 | } else { | |
880 | host->ios.chip_select = MMC_CS_DONTCARE; | |
881 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
882 | } | |
1da177e4 | 883 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 884 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 885 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 886 | mmc_set_ios(host); |
1da177e4 | 887 | |
f9996aee PO |
888 | /* |
889 | * This delay should be sufficient to allow the power supply | |
890 | * to reach the minimum voltage. | |
891 | */ | |
79bccc5a | 892 | mmc_delay(10); |
1da177e4 | 893 | |
8dfd0374 SH |
894 | if (host->f_min > 400000) { |
895 | pr_warning("%s: Minimum clock frequency too high for " | |
896 | "identification mode\n", mmc_hostname(host)); | |
897 | host->ios.clock = host->f_min; | |
898 | } else | |
899 | host->ios.clock = 400000; | |
900 | ||
1da177e4 | 901 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 902 | mmc_set_ios(host); |
1da177e4 | 903 | |
f9996aee PO |
904 | /* |
905 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
906 | * time required to reach a stable voltage. | |
907 | */ | |
79bccc5a | 908 | mmc_delay(10); |
1da177e4 LT |
909 | } |
910 | ||
911 | static void mmc_power_off(struct mmc_host *host) | |
912 | { | |
913 | host->ios.clock = 0; | |
914 | host->ios.vdd = 0; | |
af517150 DB |
915 | if (!mmc_host_is_spi(host)) { |
916 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
917 | host->ios.chip_select = MMC_CS_DONTCARE; | |
918 | } | |
1da177e4 | 919 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 920 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 921 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 922 | mmc_set_ios(host); |
1da177e4 LT |
923 | } |
924 | ||
39361851 AB |
925 | /* |
926 | * Cleanup when the last reference to the bus operator is dropped. | |
927 | */ | |
261172fd | 928 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
929 | { |
930 | BUG_ON(!host); | |
931 | BUG_ON(host->bus_refs); | |
932 | BUG_ON(!host->bus_dead); | |
933 | ||
934 | host->bus_ops = NULL; | |
935 | } | |
936 | ||
937 | /* | |
938 | * Increase reference count of bus operator | |
939 | */ | |
940 | static inline void mmc_bus_get(struct mmc_host *host) | |
941 | { | |
942 | unsigned long flags; | |
943 | ||
944 | spin_lock_irqsave(&host->lock, flags); | |
945 | host->bus_refs++; | |
946 | spin_unlock_irqrestore(&host->lock, flags); | |
947 | } | |
948 | ||
949 | /* | |
950 | * Decrease reference count of bus operator and free it if | |
951 | * it is the last reference. | |
952 | */ | |
953 | static inline void mmc_bus_put(struct mmc_host *host) | |
954 | { | |
955 | unsigned long flags; | |
956 | ||
957 | spin_lock_irqsave(&host->lock, flags); | |
958 | host->bus_refs--; | |
959 | if ((host->bus_refs == 0) && host->bus_ops) | |
960 | __mmc_release_bus(host); | |
961 | spin_unlock_irqrestore(&host->lock, flags); | |
962 | } | |
963 | ||
1da177e4 | 964 | /* |
7ea239d9 PO |
965 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
966 | * host at any given time. | |
1da177e4 | 967 | */ |
7ea239d9 | 968 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 969 | { |
7ea239d9 | 970 | unsigned long flags; |
e45a1bd2 | 971 | |
7ea239d9 PO |
972 | BUG_ON(!host); |
973 | BUG_ON(!ops); | |
b855885e | 974 | |
d84075c8 | 975 | WARN_ON(!host->claimed); |
bce40a36 | 976 | |
7ea239d9 | 977 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 978 | |
7ea239d9 PO |
979 | BUG_ON(host->bus_ops); |
980 | BUG_ON(host->bus_refs); | |
b57c43ad | 981 | |
7ea239d9 PO |
982 | host->bus_ops = ops; |
983 | host->bus_refs = 1; | |
984 | host->bus_dead = 0; | |
b57c43ad | 985 | |
7ea239d9 | 986 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
987 | } |
988 | ||
7ea239d9 PO |
989 | /* |
990 | * Remove the current bus handler from a host. Assumes that there are | |
991 | * no interesting cards left, so the bus is powered down. | |
992 | */ | |
993 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 994 | { |
7ea239d9 | 995 | unsigned long flags; |
7ccd266e | 996 | |
7ea239d9 | 997 | BUG_ON(!host); |
7ccd266e | 998 | |
d84075c8 PO |
999 | WARN_ON(!host->claimed); |
1000 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1001 | |
7ea239d9 | 1002 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1003 | |
7ea239d9 | 1004 | host->bus_dead = 1; |
7ccd266e | 1005 | |
7ea239d9 | 1006 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1007 | |
7ea239d9 | 1008 | mmc_power_off(host); |
1da177e4 | 1009 | |
7ea239d9 | 1010 | mmc_bus_put(host); |
1da177e4 LT |
1011 | } |
1012 | ||
1da177e4 LT |
1013 | /** |
1014 | * mmc_detect_change - process change of state on a MMC socket | |
1015 | * @host: host which changed state. | |
8dc00335 | 1016 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1017 | * |
67a61c48 PO |
1018 | * MMC drivers should call this when they detect a card has been |
1019 | * inserted or removed. The MMC layer will confirm that any | |
1020 | * present card is still functional, and initialize any newly | |
1021 | * inserted. | |
1da177e4 | 1022 | */ |
8dc00335 | 1023 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1024 | { |
3b91e550 | 1025 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1026 | unsigned long flags; |
01f41ec7 | 1027 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1028 | WARN_ON(host->removed); |
01f41ec7 | 1029 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1030 | #endif |
1031 | ||
c4028958 | 1032 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | EXPORT_SYMBOL(mmc_detect_change); | |
1036 | ||
1037 | ||
b93931a6 | 1038 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 1039 | { |
c4028958 DH |
1040 | struct mmc_host *host = |
1041 | container_of(work, struct mmc_host, detect.work); | |
7ea239d9 PO |
1042 | u32 ocr; |
1043 | int err; | |
1da177e4 | 1044 | |
7ea239d9 | 1045 | mmc_bus_get(host); |
b855885e | 1046 | |
94d89efb JS |
1047 | /* if there is a card registered, check whether it is still present */ |
1048 | if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead) | |
1049 | host->bus_ops->detect(host); | |
1050 | ||
1051 | mmc_bus_put(host); | |
1052 | ||
1053 | ||
1054 | mmc_bus_get(host); | |
1055 | ||
1056 | /* if there still is a card present, stop here */ | |
1057 | if (host->bus_ops != NULL) { | |
7ea239d9 | 1058 | mmc_bus_put(host); |
94d89efb JS |
1059 | goto out; |
1060 | } | |
1da177e4 | 1061 | |
94d89efb | 1062 | /* detect a newly inserted card */ |
28f52482 | 1063 | |
94d89efb JS |
1064 | /* |
1065 | * Only we can add a new handler, so it's safe to | |
1066 | * release the lock here. | |
1067 | */ | |
1068 | mmc_bus_put(host); | |
1da177e4 | 1069 | |
94d89efb JS |
1070 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
1071 | goto out; | |
1da177e4 | 1072 | |
94d89efb | 1073 | mmc_claim_host(host); |
1da177e4 | 1074 | |
94d89efb JS |
1075 | mmc_power_up(host); |
1076 | mmc_go_idle(host); | |
5c4e6f13 | 1077 | |
94d89efb | 1078 | mmc_send_if_cond(host, host->ocr_avail); |
5c4e6f13 | 1079 | |
94d89efb JS |
1080 | /* |
1081 | * First we search for SDIO... | |
1082 | */ | |
1083 | err = mmc_send_io_op_cond(host, 0, &ocr); | |
1084 | if (!err) { | |
1085 | if (mmc_attach_sdio(host, ocr)) | |
1086 | mmc_power_off(host); | |
1087 | goto out; | |
1088 | } | |
5c4e6f13 | 1089 | |
94d89efb JS |
1090 | /* |
1091 | * ...then normal SD... | |
1092 | */ | |
1093 | err = mmc_send_app_op_cond(host, 0, &ocr); | |
1094 | if (!err) { | |
1095 | if (mmc_attach_sd(host, ocr)) | |
1096 | mmc_power_off(host); | |
1097 | goto out; | |
1098 | } | |
7ea239d9 | 1099 | |
94d89efb JS |
1100 | /* |
1101 | * ...and finally MMC. | |
1102 | */ | |
1103 | err = mmc_send_op_cond(host, 0, &ocr); | |
1104 | if (!err) { | |
1105 | if (mmc_attach_mmc(host, ocr)) | |
1106 | mmc_power_off(host); | |
1107 | goto out; | |
7ea239d9 | 1108 | } |
94d89efb JS |
1109 | |
1110 | mmc_release_host(host); | |
1111 | mmc_power_off(host); | |
1112 | ||
28f52482 AV |
1113 | out: |
1114 | if (host->caps & MMC_CAP_NEEDS_POLL) | |
1115 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
1116 | } |
1117 | ||
b93931a6 | 1118 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 1119 | { |
b93931a6 PO |
1120 | mmc_power_off(host); |
1121 | mmc_detect_change(host, 0); | |
1da177e4 LT |
1122 | } |
1123 | ||
b93931a6 | 1124 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 1125 | { |
3b91e550 | 1126 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
1127 | unsigned long flags; |
1128 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 1129 | host->removed = 1; |
1efd48b3 | 1130 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1131 | #endif |
1132 | ||
8ea926b2 AH |
1133 | if (host->caps & MMC_CAP_DISABLE) |
1134 | cancel_delayed_work(&host->disable); | |
7de427d0 | 1135 | cancel_delayed_work(&host->detect); |
3b91e550 PO |
1136 | mmc_flush_scheduled_work(); |
1137 | ||
7ea239d9 PO |
1138 | mmc_bus_get(host); |
1139 | if (host->bus_ops && !host->bus_dead) { | |
1140 | if (host->bus_ops->remove) | |
1141 | host->bus_ops->remove(host); | |
1142 | ||
1143 | mmc_claim_host(host); | |
1144 | mmc_detach_bus(host); | |
1145 | mmc_release_host(host); | |
1da177e4 | 1146 | } |
7ea239d9 PO |
1147 | mmc_bus_put(host); |
1148 | ||
1149 | BUG_ON(host->card); | |
1da177e4 LT |
1150 | |
1151 | mmc_power_off(host); | |
1152 | } | |
1153 | ||
eae1aeee AH |
1154 | void mmc_power_save_host(struct mmc_host *host) |
1155 | { | |
1156 | mmc_bus_get(host); | |
1157 | ||
1158 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1159 | mmc_bus_put(host); | |
1160 | return; | |
1161 | } | |
1162 | ||
1163 | if (host->bus_ops->power_save) | |
1164 | host->bus_ops->power_save(host); | |
1165 | ||
1166 | mmc_bus_put(host); | |
1167 | ||
1168 | mmc_power_off(host); | |
1169 | } | |
1170 | EXPORT_SYMBOL(mmc_power_save_host); | |
1171 | ||
1172 | void mmc_power_restore_host(struct mmc_host *host) | |
1173 | { | |
1174 | mmc_bus_get(host); | |
1175 | ||
1176 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1177 | mmc_bus_put(host); | |
1178 | return; | |
1179 | } | |
1180 | ||
1181 | mmc_power_up(host); | |
1182 | host->bus_ops->power_restore(host); | |
1183 | ||
1184 | mmc_bus_put(host); | |
1185 | } | |
1186 | EXPORT_SYMBOL(mmc_power_restore_host); | |
1187 | ||
b1ebe384 JL |
1188 | int mmc_card_awake(struct mmc_host *host) |
1189 | { | |
1190 | int err = -ENOSYS; | |
1191 | ||
1192 | mmc_bus_get(host); | |
1193 | ||
1194 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1195 | err = host->bus_ops->awake(host); | |
1196 | ||
1197 | mmc_bus_put(host); | |
1198 | ||
1199 | return err; | |
1200 | } | |
1201 | EXPORT_SYMBOL(mmc_card_awake); | |
1202 | ||
1203 | int mmc_card_sleep(struct mmc_host *host) | |
1204 | { | |
1205 | int err = -ENOSYS; | |
1206 | ||
1207 | mmc_bus_get(host); | |
1208 | ||
1209 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1210 | err = host->bus_ops->sleep(host); | |
1211 | ||
1212 | mmc_bus_put(host); | |
1213 | ||
1214 | return err; | |
1215 | } | |
1216 | EXPORT_SYMBOL(mmc_card_sleep); | |
1217 | ||
1218 | int mmc_card_can_sleep(struct mmc_host *host) | |
1219 | { | |
1220 | struct mmc_card *card = host->card; | |
1221 | ||
1222 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
1223 | return 1; | |
1224 | return 0; | |
1225 | } | |
1226 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
1227 | ||
1da177e4 LT |
1228 | #ifdef CONFIG_PM |
1229 | ||
1230 | /** | |
1231 | * mmc_suspend_host - suspend a host | |
1232 | * @host: mmc host | |
1233 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1234 | */ | |
e5378ca8 | 1235 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 | 1236 | { |
8ea926b2 AH |
1237 | if (host->caps & MMC_CAP_DISABLE) |
1238 | cancel_delayed_work(&host->disable); | |
7de427d0 | 1239 | cancel_delayed_work(&host->detect); |
b5af25be PO |
1240 | mmc_flush_scheduled_work(); |
1241 | ||
7ea239d9 PO |
1242 | mmc_bus_get(host); |
1243 | if (host->bus_ops && !host->bus_dead) { | |
6abaa0c9 PO |
1244 | if (host->bus_ops->suspend) |
1245 | host->bus_ops->suspend(host); | |
1246 | if (!host->bus_ops->resume) { | |
1247 | if (host->bus_ops->remove) | |
1248 | host->bus_ops->remove(host); | |
1249 | ||
1250 | mmc_claim_host(host); | |
1251 | mmc_detach_bus(host); | |
1252 | mmc_release_host(host); | |
1253 | } | |
b5af25be | 1254 | } |
7ea239d9 PO |
1255 | mmc_bus_put(host); |
1256 | ||
1da177e4 | 1257 | mmc_power_off(host); |
1da177e4 LT |
1258 | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | EXPORT_SYMBOL(mmc_suspend_host); | |
1263 | ||
1264 | /** | |
1265 | * mmc_resume_host - resume a previously suspended host | |
1266 | * @host: mmc host | |
1267 | */ | |
1268 | int mmc_resume_host(struct mmc_host *host) | |
1269 | { | |
6abaa0c9 PO |
1270 | mmc_bus_get(host); |
1271 | if (host->bus_ops && !host->bus_dead) { | |
1272 | mmc_power_up(host); | |
d3096f88 | 1273 | mmc_select_voltage(host, host->ocr); |
6abaa0c9 PO |
1274 | BUG_ON(!host->bus_ops->resume); |
1275 | host->bus_ops->resume(host); | |
1276 | } | |
1277 | mmc_bus_put(host); | |
1278 | ||
1279 | /* | |
1280 | * We add a slight delay here so that resume can progress | |
1281 | * in parallel. | |
1282 | */ | |
1283 | mmc_detect_change(host, 1); | |
1da177e4 LT |
1284 | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | EXPORT_SYMBOL(mmc_resume_host); | |
1289 | ||
1290 | #endif | |
1291 | ||
ffce2e7e PO |
1292 | static int __init mmc_init(void) |
1293 | { | |
1294 | int ret; | |
1295 | ||
1296 | workqueue = create_singlethread_workqueue("kmmcd"); | |
1297 | if (!workqueue) | |
1298 | return -ENOMEM; | |
1299 | ||
1300 | ret = mmc_register_bus(); | |
e29a7d73 PO |
1301 | if (ret) |
1302 | goto destroy_workqueue; | |
1303 | ||
1304 | ret = mmc_register_host_class(); | |
1305 | if (ret) | |
1306 | goto unregister_bus; | |
1307 | ||
1308 | ret = sdio_register_bus(); | |
1309 | if (ret) | |
1310 | goto unregister_host_class; | |
1311 | ||
1312 | return 0; | |
1313 | ||
1314 | unregister_host_class: | |
1315 | mmc_unregister_host_class(); | |
1316 | unregister_bus: | |
1317 | mmc_unregister_bus(); | |
1318 | destroy_workqueue: | |
1319 | destroy_workqueue(workqueue); | |
1320 | ||
ffce2e7e PO |
1321 | return ret; |
1322 | } | |
1323 | ||
1324 | static void __exit mmc_exit(void) | |
1325 | { | |
e29a7d73 | 1326 | sdio_unregister_bus(); |
ffce2e7e PO |
1327 | mmc_unregister_host_class(); |
1328 | mmc_unregister_bus(); | |
1329 | destroy_workqueue(workqueue); | |
1330 | } | |
1331 | ||
26074962 | 1332 | subsys_initcall(mmc_init); |
ffce2e7e PO |
1333 | module_exit(mmc_exit); |
1334 | ||
1da177e4 | 1335 | MODULE_LICENSE("GPL"); |