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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> |
e594573d | 25 | #include <linux/pm_runtime.h> |
1da177e4 LT |
26 | |
27 | #include <linux/mmc/card.h> | |
28 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
29 | #include <linux/mmc/mmc.h> |
30 | #include <linux/mmc/sd.h> | |
1da177e4 | 31 | |
aaac1b47 | 32 | #include "core.h" |
ffce2e7e PO |
33 | #include "bus.h" |
34 | #include "host.h" | |
e29a7d73 | 35 | #include "sdio_bus.h" |
da7fbe58 PO |
36 | |
37 | #include "mmc_ops.h" | |
38 | #include "sd_ops.h" | |
5c4e6f13 | 39 | #include "sdio_ops.h" |
1da177e4 | 40 | |
ffce2e7e PO |
41 | static struct workqueue_struct *workqueue; |
42 | ||
af517150 DB |
43 | /* |
44 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
45 | * performance cost, and for other reasons may not always be desired. | |
46 | * So we allow it it to be disabled. | |
47 | */ | |
48 | int use_spi_crc = 1; | |
49 | module_param(use_spi_crc, bool, 0); | |
50 | ||
bd68e083 BH |
51 | /* |
52 | * We normally treat cards as removed during suspend if they are not | |
53 | * known to be on a non-removable bus, to avoid the risk of writing | |
54 | * back data to a different card after resume. Allow this to be | |
55 | * overridden if necessary. | |
56 | */ | |
57 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
58 | int mmc_assume_removable; | |
59 | #else | |
60 | int mmc_assume_removable = 1; | |
61 | #endif | |
71d7d3d1 | 62 | EXPORT_SYMBOL(mmc_assume_removable); |
bd68e083 BH |
63 | module_param_named(removable, mmc_assume_removable, bool, 0644); |
64 | MODULE_PARM_DESC( | |
65 | removable, | |
66 | "MMC/SD cards are removable and may be removed during suspend"); | |
67 | ||
ffce2e7e PO |
68 | /* |
69 | * Internal function. Schedule delayed work in the MMC work queue. | |
70 | */ | |
71 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
72 | unsigned long delay) | |
73 | { | |
74 | return queue_delayed_work(workqueue, work, delay); | |
75 | } | |
76 | ||
77 | /* | |
78 | * Internal function. Flush all scheduled work from the MMC work queue. | |
79 | */ | |
80 | static void mmc_flush_scheduled_work(void) | |
81 | { | |
82 | flush_workqueue(workqueue); | |
83 | } | |
84 | ||
1da177e4 | 85 | /** |
fe10c6ab RK |
86 | * mmc_request_done - finish processing an MMC request |
87 | * @host: MMC host which completed request | |
88 | * @mrq: MMC request which request | |
1da177e4 LT |
89 | * |
90 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 91 | * their processing of a request. |
1da177e4 LT |
92 | */ |
93 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
94 | { | |
95 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
96 | int err = cmd->error; |
97 | ||
af517150 DB |
98 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
99 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
100 | cmd->retries = 0; | |
101 | } | |
102 | ||
1da177e4 | 103 | if (err && cmd->retries) { |
e4d21708 PO |
104 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", |
105 | mmc_hostname(host), cmd->opcode, err); | |
106 | ||
1da177e4 LT |
107 | cmd->retries--; |
108 | cmd->error = 0; | |
109 | host->ops->request(host, mrq); | |
e4d21708 | 110 | } else { |
af8350c7 PO |
111 | led_trigger_event(host->led, LED_OFF); |
112 | ||
e4d21708 PO |
113 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
114 | mmc_hostname(host), cmd->opcode, err, | |
115 | cmd->resp[0], cmd->resp[1], | |
116 | cmd->resp[2], cmd->resp[3]); | |
117 | ||
118 | if (mrq->data) { | |
119 | pr_debug("%s: %d bytes transferred: %d\n", | |
120 | mmc_hostname(host), | |
121 | mrq->data->bytes_xfered, mrq->data->error); | |
122 | } | |
123 | ||
124 | if (mrq->stop) { | |
125 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
126 | mmc_hostname(host), mrq->stop->opcode, | |
127 | mrq->stop->error, | |
128 | mrq->stop->resp[0], mrq->stop->resp[1], | |
129 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
130 | } | |
131 | ||
132 | if (mrq->done) | |
133 | mrq->done(mrq); | |
04566831 LW |
134 | |
135 | mmc_host_clk_gate(host); | |
1da177e4 LT |
136 | } |
137 | } | |
138 | ||
139 | EXPORT_SYMBOL(mmc_request_done); | |
140 | ||
39361851 | 141 | static void |
1da177e4 LT |
142 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
143 | { | |
976d9276 PO |
144 | #ifdef CONFIG_MMC_DEBUG |
145 | unsigned int i, sz; | |
a84756c5 | 146 | struct scatterlist *sg; |
976d9276 PO |
147 | #endif |
148 | ||
920e70c5 RK |
149 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
150 | mmc_hostname(host), mrq->cmd->opcode, | |
151 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 152 | |
e4d21708 PO |
153 | if (mrq->data) { |
154 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
155 | "tsac %d ms nsac %d\n", | |
156 | mmc_hostname(host), mrq->data->blksz, | |
157 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 158 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
159 | mrq->data->timeout_clks); |
160 | } | |
161 | ||
162 | if (mrq->stop) { | |
163 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
164 | mmc_hostname(host), mrq->stop->opcode, | |
165 | mrq->stop->arg, mrq->stop->flags); | |
166 | } | |
167 | ||
f22ee4ed | 168 | WARN_ON(!host->claimed); |
1da177e4 | 169 | |
af8350c7 PO |
170 | led_trigger_event(host->led, LED_FULL); |
171 | ||
1da177e4 LT |
172 | mrq->cmd->error = 0; |
173 | mrq->cmd->mrq = mrq; | |
174 | if (mrq->data) { | |
fe4a3c7a | 175 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
176 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
177 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
178 | host->max_req_size); | |
fe4a3c7a | 179 | |
976d9276 PO |
180 | #ifdef CONFIG_MMC_DEBUG |
181 | sz = 0; | |
a84756c5 PO |
182 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
183 | sz += sg->length; | |
976d9276 PO |
184 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
185 | #endif | |
186 | ||
1da177e4 LT |
187 | mrq->cmd->data = mrq->data; |
188 | mrq->data->error = 0; | |
189 | mrq->data->mrq = mrq; | |
190 | if (mrq->stop) { | |
191 | mrq->data->stop = mrq->stop; | |
192 | mrq->stop->error = 0; | |
193 | mrq->stop->mrq = mrq; | |
194 | } | |
195 | } | |
04566831 | 196 | mmc_host_clk_ungate(host); |
1da177e4 LT |
197 | host->ops->request(host, mrq); |
198 | } | |
199 | ||
1da177e4 LT |
200 | static void mmc_wait_done(struct mmc_request *mrq) |
201 | { | |
202 | complete(mrq->done_data); | |
203 | } | |
204 | ||
67a61c48 PO |
205 | /** |
206 | * mmc_wait_for_req - start a request and wait for completion | |
207 | * @host: MMC host to start command | |
208 | * @mrq: MMC request to start | |
209 | * | |
210 | * Start a new MMC custom command request for a host, and wait | |
211 | * for the command to complete. Does not attempt to parse the | |
212 | * response. | |
213 | */ | |
214 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 215 | { |
0afffc72 | 216 | DECLARE_COMPLETION_ONSTACK(complete); |
1da177e4 LT |
217 | |
218 | mrq->done_data = &complete; | |
219 | mrq->done = mmc_wait_done; | |
220 | ||
221 | mmc_start_request(host, mrq); | |
222 | ||
223 | wait_for_completion(&complete); | |
1da177e4 LT |
224 | } |
225 | ||
226 | EXPORT_SYMBOL(mmc_wait_for_req); | |
227 | ||
228 | /** | |
229 | * mmc_wait_for_cmd - start a command and wait for completion | |
230 | * @host: MMC host to start command | |
231 | * @cmd: MMC command to start | |
232 | * @retries: maximum number of retries | |
233 | * | |
234 | * Start a new MMC command for a host, and wait for the command | |
235 | * to complete. Return any error that occurred while the command | |
236 | * was executing. Do not attempt to parse the response. | |
237 | */ | |
238 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
239 | { | |
240 | struct mmc_request mrq; | |
241 | ||
d84075c8 | 242 | WARN_ON(!host->claimed); |
1da177e4 LT |
243 | |
244 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
245 | ||
246 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
247 | cmd->retries = retries; | |
248 | ||
249 | mrq.cmd = cmd; | |
250 | cmd->data = NULL; | |
251 | ||
252 | mmc_wait_for_req(host, &mrq); | |
253 | ||
254 | return cmd->error; | |
255 | } | |
256 | ||
257 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
258 | ||
d773d725 RK |
259 | /** |
260 | * mmc_set_data_timeout - set the timeout for a data command | |
261 | * @data: data phase for command | |
262 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
263 | * |
264 | * Computes the data timeout parameters according to the | |
265 | * correct algorithm given the card type. | |
d773d725 | 266 | */ |
b146d26a | 267 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
268 | { |
269 | unsigned int mult; | |
270 | ||
e6f918bf PO |
271 | /* |
272 | * SDIO cards only define an upper 1 s limit on access. | |
273 | */ | |
274 | if (mmc_card_sdio(card)) { | |
275 | data->timeout_ns = 1000000000; | |
276 | data->timeout_clks = 0; | |
277 | return; | |
278 | } | |
279 | ||
d773d725 RK |
280 | /* |
281 | * SD cards use a 100 multiplier rather than 10 | |
282 | */ | |
283 | mult = mmc_card_sd(card) ? 100 : 10; | |
284 | ||
285 | /* | |
286 | * Scale up the multiplier (and therefore the timeout) by | |
287 | * the r2w factor for writes. | |
288 | */ | |
b146d26a | 289 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
290 | mult <<= card->csd.r2w_factor; |
291 | ||
292 | data->timeout_ns = card->csd.tacc_ns * mult; | |
293 | data->timeout_clks = card->csd.tacc_clks * mult; | |
294 | ||
295 | /* | |
296 | * SD cards also have an upper limit on the timeout. | |
297 | */ | |
298 | if (mmc_card_sd(card)) { | |
299 | unsigned int timeout_us, limit_us; | |
300 | ||
301 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
302 | if (mmc_host_clk_rate(card->host)) |
303 | timeout_us += data->timeout_clks * 1000 / | |
304 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 305 | |
b146d26a | 306 | if (data->flags & MMC_DATA_WRITE) |
493890e7 PO |
307 | /* |
308 | * The limit is really 250 ms, but that is | |
309 | * insufficient for some crappy cards. | |
310 | */ | |
311 | limit_us = 300000; | |
d773d725 RK |
312 | else |
313 | limit_us = 100000; | |
314 | ||
fba68bd2 PL |
315 | /* |
316 | * SDHC cards always use these fixed values. | |
317 | */ | |
318 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
319 | data->timeout_ns = limit_us * 1000; |
320 | data->timeout_clks = 0; | |
321 | } | |
322 | } | |
c0c88871 WM |
323 | /* |
324 | * Some cards need very high timeouts if driven in SPI mode. | |
325 | * The worst observed timeout was 900ms after writing a | |
326 | * continuous stream of data until the internal logic | |
327 | * overflowed. | |
328 | */ | |
329 | if (mmc_host_is_spi(card->host)) { | |
330 | if (data->flags & MMC_DATA_WRITE) { | |
331 | if (data->timeout_ns < 1000000000) | |
332 | data->timeout_ns = 1000000000; /* 1s */ | |
333 | } else { | |
334 | if (data->timeout_ns < 100000000) | |
335 | data->timeout_ns = 100000000; /* 100ms */ | |
336 | } | |
337 | } | |
d773d725 RK |
338 | } |
339 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
340 | ||
ad3868b2 PO |
341 | /** |
342 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
343 | * @card: the MMC card associated with the data transfer | |
344 | * @sz: original transfer size | |
345 | * | |
346 | * Pads the original data size with a number of extra bytes in | |
347 | * order to avoid controller bugs and/or performance hits | |
348 | * (e.g. some controllers revert to PIO for certain sizes). | |
349 | * | |
350 | * Returns the improved size, which might be unmodified. | |
351 | * | |
352 | * Note that this function is only relevant when issuing a | |
353 | * single scatter gather entry. | |
354 | */ | |
355 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
356 | { | |
357 | /* | |
358 | * FIXME: We don't have a system for the controller to tell | |
359 | * the core about its problems yet, so for now we just 32-bit | |
360 | * align the size. | |
361 | */ | |
362 | sz = ((sz + 3) / 4) * 4; | |
363 | ||
364 | return sz; | |
365 | } | |
366 | EXPORT_SYMBOL(mmc_align_data_size); | |
367 | ||
8ea926b2 AH |
368 | /** |
369 | * mmc_host_enable - enable a host. | |
370 | * @host: mmc host to enable | |
371 | * | |
372 | * Hosts that support power saving can use the 'enable' and 'disable' | |
373 | * methods to exit and enter power saving states. For more information | |
374 | * see comments for struct mmc_host_ops. | |
375 | */ | |
376 | int mmc_host_enable(struct mmc_host *host) | |
377 | { | |
378 | if (!(host->caps & MMC_CAP_DISABLE)) | |
379 | return 0; | |
380 | ||
381 | if (host->en_dis_recurs) | |
382 | return 0; | |
383 | ||
384 | if (host->nesting_cnt++) | |
385 | return 0; | |
386 | ||
387 | cancel_delayed_work_sync(&host->disable); | |
388 | ||
389 | if (host->enabled) | |
390 | return 0; | |
391 | ||
392 | if (host->ops->enable) { | |
393 | int err; | |
394 | ||
395 | host->en_dis_recurs = 1; | |
396 | err = host->ops->enable(host); | |
397 | host->en_dis_recurs = 0; | |
398 | ||
399 | if (err) { | |
400 | pr_debug("%s: enable error %d\n", | |
401 | mmc_hostname(host), err); | |
402 | return err; | |
403 | } | |
404 | } | |
405 | host->enabled = 1; | |
406 | return 0; | |
407 | } | |
408 | EXPORT_SYMBOL(mmc_host_enable); | |
409 | ||
410 | static int mmc_host_do_disable(struct mmc_host *host, int lazy) | |
411 | { | |
412 | if (host->ops->disable) { | |
413 | int err; | |
414 | ||
415 | host->en_dis_recurs = 1; | |
416 | err = host->ops->disable(host, lazy); | |
417 | host->en_dis_recurs = 0; | |
418 | ||
419 | if (err < 0) { | |
420 | pr_debug("%s: disable error %d\n", | |
421 | mmc_hostname(host), err); | |
422 | return err; | |
423 | } | |
424 | if (err > 0) { | |
425 | unsigned long delay = msecs_to_jiffies(err); | |
426 | ||
427 | mmc_schedule_delayed_work(&host->disable, delay); | |
428 | } | |
429 | } | |
430 | host->enabled = 0; | |
431 | return 0; | |
432 | } | |
433 | ||
434 | /** | |
435 | * mmc_host_disable - disable a host. | |
436 | * @host: mmc host to disable | |
437 | * | |
438 | * Hosts that support power saving can use the 'enable' and 'disable' | |
439 | * methods to exit and enter power saving states. For more information | |
440 | * see comments for struct mmc_host_ops. | |
441 | */ | |
442 | int mmc_host_disable(struct mmc_host *host) | |
443 | { | |
444 | int err; | |
445 | ||
446 | if (!(host->caps & MMC_CAP_DISABLE)) | |
447 | return 0; | |
448 | ||
449 | if (host->en_dis_recurs) | |
450 | return 0; | |
451 | ||
452 | if (--host->nesting_cnt) | |
453 | return 0; | |
454 | ||
455 | if (!host->enabled) | |
456 | return 0; | |
457 | ||
458 | err = mmc_host_do_disable(host, 0); | |
459 | return err; | |
460 | } | |
461 | EXPORT_SYMBOL(mmc_host_disable); | |
462 | ||
1da177e4 | 463 | /** |
2342f332 | 464 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 465 | * @host: mmc host to claim |
2342f332 | 466 | * @abort: whether or not the operation should be aborted |
1da177e4 | 467 | * |
2342f332 NP |
468 | * Claim a host for a set of operations. If @abort is non null and |
469 | * dereference a non-zero value then this will return prematurely with | |
470 | * that non-zero value without acquiring the lock. Returns zero | |
471 | * with the lock held otherwise. | |
1da177e4 | 472 | */ |
2342f332 | 473 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
474 | { |
475 | DECLARE_WAITQUEUE(wait, current); | |
476 | unsigned long flags; | |
2342f332 | 477 | int stop; |
1da177e4 | 478 | |
cf795bfb PO |
479 | might_sleep(); |
480 | ||
1da177e4 LT |
481 | add_wait_queue(&host->wq, &wait); |
482 | spin_lock_irqsave(&host->lock, flags); | |
483 | while (1) { | |
484 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 485 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 486 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
487 | break; |
488 | spin_unlock_irqrestore(&host->lock, flags); | |
489 | schedule(); | |
490 | spin_lock_irqsave(&host->lock, flags); | |
491 | } | |
492 | set_current_state(TASK_RUNNING); | |
319a3f14 | 493 | if (!stop) { |
2342f332 | 494 | host->claimed = 1; |
319a3f14 AH |
495 | host->claimer = current; |
496 | host->claim_cnt += 1; | |
497 | } else | |
2342f332 | 498 | wake_up(&host->wq); |
1da177e4 LT |
499 | spin_unlock_irqrestore(&host->lock, flags); |
500 | remove_wait_queue(&host->wq, &wait); | |
8ea926b2 AH |
501 | if (!stop) |
502 | mmc_host_enable(host); | |
2342f332 | 503 | return stop; |
1da177e4 LT |
504 | } |
505 | ||
2342f332 | 506 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 507 | |
319a3f14 AH |
508 | /** |
509 | * mmc_try_claim_host - try exclusively to claim a host | |
510 | * @host: mmc host to claim | |
511 | * | |
512 | * Returns %1 if the host is claimed, %0 otherwise. | |
513 | */ | |
514 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
515 | { |
516 | int claimed_host = 0; | |
517 | unsigned long flags; | |
518 | ||
519 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 520 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 521 | host->claimed = 1; |
319a3f14 AH |
522 | host->claimer = current; |
523 | host->claim_cnt += 1; | |
8ea926b2 AH |
524 | claimed_host = 1; |
525 | } | |
526 | spin_unlock_irqrestore(&host->lock, flags); | |
527 | return claimed_host; | |
528 | } | |
319a3f14 | 529 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 AH |
530 | |
531 | static void mmc_do_release_host(struct mmc_host *host) | |
532 | { | |
533 | unsigned long flags; | |
534 | ||
535 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 AH |
536 | if (--host->claim_cnt) { |
537 | /* Release for nested claim */ | |
538 | spin_unlock_irqrestore(&host->lock, flags); | |
539 | } else { | |
540 | host->claimed = 0; | |
541 | host->claimer = NULL; | |
542 | spin_unlock_irqrestore(&host->lock, flags); | |
543 | wake_up(&host->wq); | |
544 | } | |
8ea926b2 AH |
545 | } |
546 | ||
547 | void mmc_host_deeper_disable(struct work_struct *work) | |
548 | { | |
549 | struct mmc_host *host = | |
550 | container_of(work, struct mmc_host, disable.work); | |
551 | ||
552 | /* If the host is claimed then we do not want to disable it anymore */ | |
553 | if (!mmc_try_claim_host(host)) | |
554 | return; | |
555 | mmc_host_do_disable(host, 1); | |
556 | mmc_do_release_host(host); | |
557 | } | |
558 | ||
559 | /** | |
560 | * mmc_host_lazy_disable - lazily disable a host. | |
561 | * @host: mmc host to disable | |
562 | * | |
563 | * Hosts that support power saving can use the 'enable' and 'disable' | |
564 | * methods to exit and enter power saving states. For more information | |
565 | * see comments for struct mmc_host_ops. | |
566 | */ | |
567 | int mmc_host_lazy_disable(struct mmc_host *host) | |
568 | { | |
569 | if (!(host->caps & MMC_CAP_DISABLE)) | |
570 | return 0; | |
571 | ||
572 | if (host->en_dis_recurs) | |
573 | return 0; | |
574 | ||
575 | if (--host->nesting_cnt) | |
576 | return 0; | |
577 | ||
578 | if (!host->enabled) | |
579 | return 0; | |
580 | ||
581 | if (host->disable_delay) { | |
582 | mmc_schedule_delayed_work(&host->disable, | |
583 | msecs_to_jiffies(host->disable_delay)); | |
584 | return 0; | |
585 | } else | |
586 | return mmc_host_do_disable(host, 1); | |
587 | } | |
588 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
589 | ||
1da177e4 LT |
590 | /** |
591 | * mmc_release_host - release a host | |
592 | * @host: mmc host to release | |
593 | * | |
594 | * Release a MMC host, allowing others to claim the host | |
595 | * for their operations. | |
596 | */ | |
597 | void mmc_release_host(struct mmc_host *host) | |
598 | { | |
d84075c8 | 599 | WARN_ON(!host->claimed); |
1da177e4 | 600 | |
8ea926b2 | 601 | mmc_host_lazy_disable(host); |
1da177e4 | 602 | |
8ea926b2 | 603 | mmc_do_release_host(host); |
1da177e4 LT |
604 | } |
605 | ||
606 | EXPORT_SYMBOL(mmc_release_host); | |
607 | ||
7ea239d9 PO |
608 | /* |
609 | * Internal function that does the actual ios call to the host driver, | |
610 | * optionally printing some debug output. | |
611 | */ | |
920e70c5 RK |
612 | static inline void mmc_set_ios(struct mmc_host *host) |
613 | { | |
614 | struct mmc_ios *ios = &host->ios; | |
615 | ||
cd9277c0 PO |
616 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
617 | "width %u timing %u\n", | |
920e70c5 RK |
618 | mmc_hostname(host), ios->clock, ios->bus_mode, |
619 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 620 | ios->bus_width, ios->timing); |
fba68bd2 | 621 | |
04566831 LW |
622 | if (ios->clock > 0) |
623 | mmc_set_ungated(host); | |
920e70c5 RK |
624 | host->ops->set_ios(host, ios); |
625 | } | |
626 | ||
7ea239d9 PO |
627 | /* |
628 | * Control chip select pin on a host. | |
629 | */ | |
da7fbe58 | 630 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 631 | { |
da7fbe58 PO |
632 | host->ios.chip_select = mode; |
633 | mmc_set_ios(host); | |
1da177e4 LT |
634 | } |
635 | ||
7ea239d9 PO |
636 | /* |
637 | * Sets the host clock to the highest possible frequency that | |
638 | * is below "hz". | |
639 | */ | |
640 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) | |
641 | { | |
642 | WARN_ON(hz < host->f_min); | |
643 | ||
644 | if (hz > host->f_max) | |
645 | hz = host->f_max; | |
646 | ||
647 | host->ios.clock = hz; | |
648 | mmc_set_ios(host); | |
649 | } | |
650 | ||
04566831 LW |
651 | #ifdef CONFIG_MMC_CLKGATE |
652 | /* | |
653 | * This gates the clock by setting it to 0 Hz. | |
654 | */ | |
655 | void mmc_gate_clock(struct mmc_host *host) | |
656 | { | |
657 | unsigned long flags; | |
658 | ||
659 | spin_lock_irqsave(&host->clk_lock, flags); | |
660 | host->clk_old = host->ios.clock; | |
661 | host->ios.clock = 0; | |
662 | host->clk_gated = true; | |
663 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
664 | mmc_set_ios(host); | |
665 | } | |
666 | ||
667 | /* | |
668 | * This restores the clock from gating by using the cached | |
669 | * clock value. | |
670 | */ | |
671 | void mmc_ungate_clock(struct mmc_host *host) | |
672 | { | |
673 | /* | |
674 | * We should previously have gated the clock, so the clock shall | |
675 | * be 0 here! The clock may however be 0 during initialization, | |
676 | * when some request operations are performed before setting | |
677 | * the frequency. When ungate is requested in that situation | |
678 | * we just ignore the call. | |
679 | */ | |
680 | if (host->clk_old) { | |
681 | BUG_ON(host->ios.clock); | |
682 | /* This call will also set host->clk_gated to false */ | |
683 | mmc_set_clock(host, host->clk_old); | |
684 | } | |
685 | } | |
686 | ||
687 | void mmc_set_ungated(struct mmc_host *host) | |
688 | { | |
689 | unsigned long flags; | |
690 | ||
691 | /* | |
692 | * We've been given a new frequency while the clock is gated, | |
693 | * so make sure we regard this as ungating it. | |
694 | */ | |
695 | spin_lock_irqsave(&host->clk_lock, flags); | |
696 | host->clk_gated = false; | |
697 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
698 | } | |
699 | ||
700 | #else | |
701 | void mmc_set_ungated(struct mmc_host *host) | |
702 | { | |
703 | } | |
704 | #endif | |
705 | ||
7ea239d9 PO |
706 | /* |
707 | * Change the bus mode (open drain/push-pull) of a host. | |
708 | */ | |
709 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
710 | { | |
711 | host->ios.bus_mode = mode; | |
712 | mmc_set_ios(host); | |
713 | } | |
714 | ||
715 | /* | |
0f8d8ea6 | 716 | * Change data bus width and DDR mode of a host. |
7ea239d9 | 717 | */ |
49e3b5a4 AH |
718 | void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width, |
719 | unsigned int ddr) | |
7ea239d9 PO |
720 | { |
721 | host->ios.bus_width = width; | |
49e3b5a4 | 722 | host->ios.ddr = ddr; |
7ea239d9 PO |
723 | mmc_set_ios(host); |
724 | } | |
725 | ||
0f8d8ea6 AH |
726 | /* |
727 | * Change data bus width of a host. | |
728 | */ | |
729 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
730 | { | |
49e3b5a4 | 731 | mmc_set_bus_width_ddr(host, width, MMC_SDR_MODE); |
0f8d8ea6 AH |
732 | } |
733 | ||
86e8286a AV |
734 | /** |
735 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
736 | * @vdd: voltage (mV) | |
737 | * @low_bits: prefer low bits in boundary cases | |
738 | * | |
739 | * This function returns the OCR bit number according to the provided @vdd | |
740 | * value. If conversion is not possible a negative errno value returned. | |
741 | * | |
742 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
743 | * on boundary voltages. For example, | |
744 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
745 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
746 | * | |
747 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
748 | */ | |
749 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
750 | { | |
751 | const int max_bit = ilog2(MMC_VDD_35_36); | |
752 | int bit; | |
753 | ||
754 | if (vdd < 1650 || vdd > 3600) | |
755 | return -EINVAL; | |
756 | ||
757 | if (vdd >= 1650 && vdd <= 1950) | |
758 | return ilog2(MMC_VDD_165_195); | |
759 | ||
760 | if (low_bits) | |
761 | vdd -= 1; | |
762 | ||
763 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
764 | bit = (vdd - 2000) / 100 + 8; | |
765 | if (bit > max_bit) | |
766 | return max_bit; | |
767 | return bit; | |
768 | } | |
769 | ||
770 | /** | |
771 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
772 | * @vdd_min: minimum voltage value (mV) | |
773 | * @vdd_max: maximum voltage value (mV) | |
774 | * | |
775 | * This function returns the OCR mask bits according to the provided @vdd_min | |
776 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
777 | * | |
778 | * Notes wrt boundary cases: | |
779 | * This function sets the OCR bits for all boundary voltages, for example | |
780 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
781 | * MMC_VDD_34_35 mask. | |
782 | */ | |
783 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
784 | { | |
785 | u32 mask = 0; | |
786 | ||
787 | if (vdd_max < vdd_min) | |
788 | return 0; | |
789 | ||
790 | /* Prefer high bits for the boundary vdd_max values. */ | |
791 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
792 | if (vdd_max < 0) | |
793 | return 0; | |
794 | ||
795 | /* Prefer low bits for the boundary vdd_min values. */ | |
796 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
797 | if (vdd_min < 0) | |
798 | return 0; | |
799 | ||
800 | /* Fill the mask, from max bit to min bit. */ | |
801 | while (vdd_max >= vdd_min) | |
802 | mask |= 1 << vdd_max--; | |
803 | ||
804 | return mask; | |
805 | } | |
806 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
807 | ||
5c13941a DB |
808 | #ifdef CONFIG_REGULATOR |
809 | ||
810 | /** | |
811 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
812 | * @supply: regulator to use | |
813 | * | |
814 | * This returns either a negative errno, or a mask of voltages that | |
815 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
816 | * regulator. This would normally be called before registering the | |
817 | * MMC host adapter. | |
818 | */ | |
819 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
820 | { | |
821 | int result = 0; | |
822 | int count; | |
823 | int i; | |
824 | ||
825 | count = regulator_count_voltages(supply); | |
826 | if (count < 0) | |
827 | return count; | |
828 | ||
829 | for (i = 0; i < count; i++) { | |
830 | int vdd_uV; | |
831 | int vdd_mV; | |
832 | ||
833 | vdd_uV = regulator_list_voltage(supply, i); | |
834 | if (vdd_uV <= 0) | |
835 | continue; | |
836 | ||
837 | vdd_mV = vdd_uV / 1000; | |
838 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
839 | } | |
840 | ||
841 | return result; | |
842 | } | |
843 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
844 | ||
845 | /** | |
846 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 847 | * @mmc: the host to regulate |
5c13941a | 848 | * @supply: regulator to use |
99fc5131 | 849 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
850 | * |
851 | * Returns zero on success, else negative errno. | |
852 | * | |
853 | * MMC host drivers may use this to enable or disable a regulator using | |
854 | * a particular supply voltage. This would normally be called from the | |
855 | * set_ios() method. | |
856 | */ | |
99fc5131 LW |
857 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
858 | struct regulator *supply, | |
859 | unsigned short vdd_bit) | |
5c13941a DB |
860 | { |
861 | int result = 0; | |
862 | int min_uV, max_uV; | |
5c13941a DB |
863 | |
864 | if (vdd_bit) { | |
865 | int tmp; | |
866 | int voltage; | |
867 | ||
868 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
869 | * bits this regulator doesn't quite support ... don't | |
870 | * be too picky, most cards and regulators are OK with | |
871 | * a 0.1V range goof (it's a small error percentage). | |
872 | */ | |
873 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
874 | if (tmp == 0) { | |
875 | min_uV = 1650 * 1000; | |
876 | max_uV = 1950 * 1000; | |
877 | } else { | |
878 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
879 | max_uV = min_uV + 100 * 1000; | |
880 | } | |
881 | ||
882 | /* avoid needless changes to this voltage; the regulator | |
883 | * might not allow this operation | |
884 | */ | |
885 | voltage = regulator_get_voltage(supply); | |
886 | if (voltage < 0) | |
887 | result = voltage; | |
888 | else if (voltage < min_uV || voltage > max_uV) | |
889 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
890 | else | |
891 | result = 0; | |
892 | ||
99fc5131 | 893 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 894 | result = regulator_enable(supply); |
99fc5131 LW |
895 | if (!result) |
896 | mmc->regulator_enabled = true; | |
897 | } | |
898 | } else if (mmc->regulator_enabled) { | |
5c13941a | 899 | result = regulator_disable(supply); |
99fc5131 LW |
900 | if (result == 0) |
901 | mmc->regulator_enabled = false; | |
5c13941a DB |
902 | } |
903 | ||
99fc5131 LW |
904 | if (result) |
905 | dev_err(mmc_dev(mmc), | |
906 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
907 | return result; |
908 | } | |
909 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
910 | ||
99fc5131 | 911 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 912 | |
1da177e4 LT |
913 | /* |
914 | * Mask off any voltages we don't support and select | |
915 | * the lowest voltage | |
916 | */ | |
7ea239d9 | 917 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
918 | { |
919 | int bit; | |
920 | ||
921 | ocr &= host->ocr_avail; | |
922 | ||
923 | bit = ffs(ocr); | |
924 | if (bit) { | |
925 | bit -= 1; | |
926 | ||
63ef731a | 927 | ocr &= 3 << bit; |
1da177e4 LT |
928 | |
929 | host->ios.vdd = bit; | |
920e70c5 | 930 | mmc_set_ios(host); |
1da177e4 | 931 | } else { |
f6e10b86 DB |
932 | pr_warning("%s: host doesn't support card's voltages\n", |
933 | mmc_hostname(host)); | |
1da177e4 LT |
934 | ocr = 0; |
935 | } | |
936 | ||
937 | return ocr; | |
938 | } | |
939 | ||
b57c43ad | 940 | /* |
7ea239d9 | 941 | * Select timing parameters for host. |
b57c43ad | 942 | */ |
7ea239d9 | 943 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 944 | { |
7ea239d9 PO |
945 | host->ios.timing = timing; |
946 | mmc_set_ios(host); | |
b57c43ad PO |
947 | } |
948 | ||
1da177e4 | 949 | /* |
45f8245b RK |
950 | * Apply power to the MMC stack. This is a two-stage process. |
951 | * First, we enable power to the card without the clock running. | |
952 | * We then wait a bit for the power to stabilise. Finally, | |
953 | * enable the bus drivers and clock to the card. | |
954 | * | |
955 | * We must _NOT_ enable the clock prior to power stablising. | |
956 | * | |
957 | * If a host does all the power sequencing itself, ignore the | |
958 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
959 | */ |
960 | static void mmc_power_up(struct mmc_host *host) | |
961 | { | |
500f3564 BR |
962 | int bit; |
963 | ||
964 | /* If ocr is set, we use it */ | |
965 | if (host->ocr) | |
966 | bit = ffs(host->ocr) - 1; | |
967 | else | |
968 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
969 | |
970 | host->ios.vdd = bit; | |
af517150 DB |
971 | if (mmc_host_is_spi(host)) { |
972 | host->ios.chip_select = MMC_CS_HIGH; | |
973 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
974 | } else { | |
975 | host->ios.chip_select = MMC_CS_DONTCARE; | |
976 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
977 | } | |
1da177e4 | 978 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 979 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 980 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 981 | mmc_set_ios(host); |
1da177e4 | 982 | |
f9996aee PO |
983 | /* |
984 | * This delay should be sufficient to allow the power supply | |
985 | * to reach the minimum voltage. | |
986 | */ | |
79bccc5a | 987 | mmc_delay(10); |
1da177e4 | 988 | |
88ae8b86 | 989 | host->ios.clock = host->f_init; |
8dfd0374 | 990 | |
1da177e4 | 991 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 992 | mmc_set_ios(host); |
1da177e4 | 993 | |
f9996aee PO |
994 | /* |
995 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
996 | * time required to reach a stable voltage. | |
997 | */ | |
79bccc5a | 998 | mmc_delay(10); |
1da177e4 LT |
999 | } |
1000 | ||
1001 | static void mmc_power_off(struct mmc_host *host) | |
1002 | { | |
1003 | host->ios.clock = 0; | |
1004 | host->ios.vdd = 0; | |
af517150 DB |
1005 | if (!mmc_host_is_spi(host)) { |
1006 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1007 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1008 | } | |
1da177e4 | 1009 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1010 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1011 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1012 | mmc_set_ios(host); |
1da177e4 LT |
1013 | } |
1014 | ||
39361851 AB |
1015 | /* |
1016 | * Cleanup when the last reference to the bus operator is dropped. | |
1017 | */ | |
261172fd | 1018 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1019 | { |
1020 | BUG_ON(!host); | |
1021 | BUG_ON(host->bus_refs); | |
1022 | BUG_ON(!host->bus_dead); | |
1023 | ||
1024 | host->bus_ops = NULL; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Increase reference count of bus operator | |
1029 | */ | |
1030 | static inline void mmc_bus_get(struct mmc_host *host) | |
1031 | { | |
1032 | unsigned long flags; | |
1033 | ||
1034 | spin_lock_irqsave(&host->lock, flags); | |
1035 | host->bus_refs++; | |
1036 | spin_unlock_irqrestore(&host->lock, flags); | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Decrease reference count of bus operator and free it if | |
1041 | * it is the last reference. | |
1042 | */ | |
1043 | static inline void mmc_bus_put(struct mmc_host *host) | |
1044 | { | |
1045 | unsigned long flags; | |
1046 | ||
1047 | spin_lock_irqsave(&host->lock, flags); | |
1048 | host->bus_refs--; | |
1049 | if ((host->bus_refs == 0) && host->bus_ops) | |
1050 | __mmc_release_bus(host); | |
1051 | spin_unlock_irqrestore(&host->lock, flags); | |
1052 | } | |
1053 | ||
1da177e4 | 1054 | /* |
7ea239d9 PO |
1055 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1056 | * host at any given time. | |
1da177e4 | 1057 | */ |
7ea239d9 | 1058 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1059 | { |
7ea239d9 | 1060 | unsigned long flags; |
e45a1bd2 | 1061 | |
7ea239d9 PO |
1062 | BUG_ON(!host); |
1063 | BUG_ON(!ops); | |
b855885e | 1064 | |
d84075c8 | 1065 | WARN_ON(!host->claimed); |
bce40a36 | 1066 | |
7ea239d9 | 1067 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1068 | |
7ea239d9 PO |
1069 | BUG_ON(host->bus_ops); |
1070 | BUG_ON(host->bus_refs); | |
b57c43ad | 1071 | |
7ea239d9 PO |
1072 | host->bus_ops = ops; |
1073 | host->bus_refs = 1; | |
1074 | host->bus_dead = 0; | |
b57c43ad | 1075 | |
7ea239d9 | 1076 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1077 | } |
1078 | ||
7ea239d9 PO |
1079 | /* |
1080 | * Remove the current bus handler from a host. Assumes that there are | |
1081 | * no interesting cards left, so the bus is powered down. | |
1082 | */ | |
1083 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1084 | { |
7ea239d9 | 1085 | unsigned long flags; |
7ccd266e | 1086 | |
7ea239d9 | 1087 | BUG_ON(!host); |
7ccd266e | 1088 | |
d84075c8 PO |
1089 | WARN_ON(!host->claimed); |
1090 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1091 | |
7ea239d9 | 1092 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1093 | |
7ea239d9 | 1094 | host->bus_dead = 1; |
7ccd266e | 1095 | |
7ea239d9 | 1096 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1097 | |
7ea239d9 | 1098 | mmc_power_off(host); |
1da177e4 | 1099 | |
7ea239d9 | 1100 | mmc_bus_put(host); |
1da177e4 LT |
1101 | } |
1102 | ||
1da177e4 LT |
1103 | /** |
1104 | * mmc_detect_change - process change of state on a MMC socket | |
1105 | * @host: host which changed state. | |
8dc00335 | 1106 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1107 | * |
67a61c48 PO |
1108 | * MMC drivers should call this when they detect a card has been |
1109 | * inserted or removed. The MMC layer will confirm that any | |
1110 | * present card is still functional, and initialize any newly | |
1111 | * inserted. | |
1da177e4 | 1112 | */ |
8dc00335 | 1113 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1114 | { |
3b91e550 | 1115 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1116 | unsigned long flags; |
01f41ec7 | 1117 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1118 | WARN_ON(host->removed); |
01f41ec7 | 1119 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1120 | #endif |
1121 | ||
c4028958 | 1122 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | EXPORT_SYMBOL(mmc_detect_change); | |
1126 | ||
dfe86cba AH |
1127 | void mmc_init_erase(struct mmc_card *card) |
1128 | { | |
1129 | unsigned int sz; | |
1130 | ||
1131 | if (is_power_of_2(card->erase_size)) | |
1132 | card->erase_shift = ffs(card->erase_size) - 1; | |
1133 | else | |
1134 | card->erase_shift = 0; | |
1135 | ||
1136 | /* | |
1137 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1138 | * card. That is not desirable because it can take a long time | |
1139 | * (minutes) potentially delaying more important I/O, and also the | |
1140 | * timeout calculations become increasingly hugely over-estimated. | |
1141 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1142 | * to that size and alignment. | |
1143 | * | |
1144 | * For SD cards that define Allocation Unit size, limit erases to one | |
1145 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1146 | * Erase Size, whether it is switched on or not, limit to that size. | |
1147 | * Otherwise just have a stab at a good value. For modern cards it | |
1148 | * will end up being 4MiB. Note that if the value is too small, it | |
1149 | * can end up taking longer to erase. | |
1150 | */ | |
1151 | if (mmc_card_sd(card) && card->ssr.au) { | |
1152 | card->pref_erase = card->ssr.au; | |
1153 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1154 | } else if (card->ext_csd.hc_erase_size) { | |
1155 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1156 | } else { | |
1157 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1158 | if (sz < 128) | |
1159 | card->pref_erase = 512 * 1024 / 512; | |
1160 | else if (sz < 512) | |
1161 | card->pref_erase = 1024 * 1024 / 512; | |
1162 | else if (sz < 1024) | |
1163 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1164 | else | |
1165 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1166 | if (card->pref_erase < card->erase_size) | |
1167 | card->pref_erase = card->erase_size; | |
1168 | else { | |
1169 | sz = card->pref_erase % card->erase_size; | |
1170 | if (sz) | |
1171 | card->pref_erase += card->erase_size - sz; | |
1172 | } | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | static void mmc_set_mmc_erase_timeout(struct mmc_card *card, | |
1177 | struct mmc_command *cmd, | |
1178 | unsigned int arg, unsigned int qty) | |
1179 | { | |
1180 | unsigned int erase_timeout; | |
1181 | ||
1182 | if (card->ext_csd.erase_group_def & 1) { | |
1183 | /* High Capacity Erase Group Size uses HC timeouts */ | |
1184 | if (arg == MMC_TRIM_ARG) | |
1185 | erase_timeout = card->ext_csd.trim_timeout; | |
1186 | else | |
1187 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1188 | } else { | |
1189 | /* CSD Erase Group Size uses write timeout */ | |
1190 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1191 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1192 | unsigned int timeout_us; | |
1193 | ||
1194 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1195 | if (card->csd.tacc_ns < 1000000) | |
1196 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1197 | else | |
1198 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1199 | ||
1200 | /* | |
1201 | * ios.clock is only a target. The real clock rate might be | |
1202 | * less but not that much less, so fudge it by multiplying by 2. | |
1203 | */ | |
1204 | timeout_clks <<= 1; | |
1205 | timeout_us += (timeout_clks * 1000) / | |
1206 | (card->host->ios.clock / 1000); | |
1207 | ||
1208 | erase_timeout = timeout_us / 1000; | |
1209 | ||
1210 | /* | |
1211 | * Theoretically, the calculation could underflow so round up | |
1212 | * to 1ms in that case. | |
1213 | */ | |
1214 | if (!erase_timeout) | |
1215 | erase_timeout = 1; | |
1216 | } | |
1217 | ||
1218 | /* Multiplier for secure operations */ | |
1219 | if (arg & MMC_SECURE_ARGS) { | |
1220 | if (arg == MMC_SECURE_ERASE_ARG) | |
1221 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1222 | else | |
1223 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1224 | } | |
1225 | ||
1226 | erase_timeout *= qty; | |
1227 | ||
1228 | /* | |
1229 | * Ensure at least a 1 second timeout for SPI as per | |
1230 | * 'mmc_set_data_timeout()' | |
1231 | */ | |
1232 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1233 | erase_timeout = 1000; | |
1234 | ||
1235 | cmd->erase_timeout = erase_timeout; | |
1236 | } | |
1237 | ||
1238 | static void mmc_set_sd_erase_timeout(struct mmc_card *card, | |
1239 | struct mmc_command *cmd, unsigned int arg, | |
1240 | unsigned int qty) | |
1241 | { | |
1242 | if (card->ssr.erase_timeout) { | |
1243 | /* Erase timeout specified in SD Status Register (SSR) */ | |
1244 | cmd->erase_timeout = card->ssr.erase_timeout * qty + | |
1245 | card->ssr.erase_offset; | |
1246 | } else { | |
1247 | /* | |
1248 | * Erase timeout not specified in SD Status Register (SSR) so | |
1249 | * use 250ms per write block. | |
1250 | */ | |
1251 | cmd->erase_timeout = 250 * qty; | |
1252 | } | |
1253 | ||
1254 | /* Must not be less than 1 second */ | |
1255 | if (cmd->erase_timeout < 1000) | |
1256 | cmd->erase_timeout = 1000; | |
1257 | } | |
1258 | ||
1259 | static void mmc_set_erase_timeout(struct mmc_card *card, | |
1260 | struct mmc_command *cmd, unsigned int arg, | |
1261 | unsigned int qty) | |
1262 | { | |
1263 | if (mmc_card_sd(card)) | |
1264 | mmc_set_sd_erase_timeout(card, cmd, arg, qty); | |
1265 | else | |
1266 | mmc_set_mmc_erase_timeout(card, cmd, arg, qty); | |
1267 | } | |
1268 | ||
1269 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1270 | unsigned int to, unsigned int arg) | |
1271 | { | |
1272 | struct mmc_command cmd; | |
1273 | unsigned int qty = 0; | |
1274 | int err; | |
1275 | ||
1276 | /* | |
1277 | * qty is used to calculate the erase timeout which depends on how many | |
1278 | * erase groups (or allocation units in SD terminology) are affected. | |
1279 | * We count erasing part of an erase group as one erase group. | |
1280 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1281 | * erase group size is almost certainly also power of 2, but it does not | |
1282 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1283 | * division in that case. SD may not specify an allocation unit size, | |
1284 | * in which case the timeout is based on the number of write blocks. | |
1285 | * | |
1286 | * Note that the timeout for secure trim 2 will only be correct if the | |
1287 | * number of erase groups specified is the same as the total of all | |
1288 | * preceding secure trim 1 commands. Since the power may have been | |
1289 | * lost since the secure trim 1 commands occurred, it is generally | |
1290 | * impossible to calculate the secure trim 2 timeout correctly. | |
1291 | */ | |
1292 | if (card->erase_shift) | |
1293 | qty += ((to >> card->erase_shift) - | |
1294 | (from >> card->erase_shift)) + 1; | |
1295 | else if (mmc_card_sd(card)) | |
1296 | qty += to - from + 1; | |
1297 | else | |
1298 | qty += ((to / card->erase_size) - | |
1299 | (from / card->erase_size)) + 1; | |
1300 | ||
1301 | if (!mmc_card_blockaddr(card)) { | |
1302 | from <<= 9; | |
1303 | to <<= 9; | |
1304 | } | |
1305 | ||
1306 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1307 | if (mmc_card_sd(card)) | |
1308 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1309 | else | |
1310 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1311 | cmd.arg = from; | |
1312 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1313 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1314 | if (err) { | |
1315 | printk(KERN_ERR "mmc_erase: group start error %d, " | |
1316 | "status %#x\n", err, cmd.resp[0]); | |
1317 | err = -EINVAL; | |
1318 | goto out; | |
1319 | } | |
1320 | ||
1321 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1322 | if (mmc_card_sd(card)) | |
1323 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1324 | else | |
1325 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1326 | cmd.arg = to; | |
1327 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1328 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1329 | if (err) { | |
1330 | printk(KERN_ERR "mmc_erase: group end error %d, status %#x\n", | |
1331 | err, cmd.resp[0]); | |
1332 | err = -EINVAL; | |
1333 | goto out; | |
1334 | } | |
1335 | ||
1336 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1337 | cmd.opcode = MMC_ERASE; | |
1338 | cmd.arg = arg; | |
1339 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
1340 | mmc_set_erase_timeout(card, &cmd, arg, qty); | |
1341 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1342 | if (err) { | |
1343 | printk(KERN_ERR "mmc_erase: erase error %d, status %#x\n", | |
1344 | err, cmd.resp[0]); | |
1345 | err = -EIO; | |
1346 | goto out; | |
1347 | } | |
1348 | ||
1349 | if (mmc_host_is_spi(card->host)) | |
1350 | goto out; | |
1351 | ||
1352 | do { | |
1353 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1354 | cmd.opcode = MMC_SEND_STATUS; | |
1355 | cmd.arg = card->rca << 16; | |
1356 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1357 | /* Do not retry else we can't see errors */ | |
1358 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1359 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
1360 | printk(KERN_ERR "error %d requesting status %#x\n", | |
1361 | err, cmd.resp[0]); | |
1362 | err = -EIO; | |
1363 | goto out; | |
1364 | } | |
1365 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
1366 | R1_CURRENT_STATE(cmd.resp[0]) == 7); | |
1367 | out: | |
1368 | return err; | |
1369 | } | |
1370 | ||
1371 | /** | |
1372 | * mmc_erase - erase sectors. | |
1373 | * @card: card to erase | |
1374 | * @from: first sector to erase | |
1375 | * @nr: number of sectors to erase | |
1376 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1377 | * | |
1378 | * Caller must claim host before calling this function. | |
1379 | */ | |
1380 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1381 | unsigned int arg) | |
1382 | { | |
1383 | unsigned int rem, to = from + nr; | |
1384 | ||
1385 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1386 | !(card->csd.cmdclass & CCC_ERASE)) | |
1387 | return -EOPNOTSUPP; | |
1388 | ||
1389 | if (!card->erase_size) | |
1390 | return -EOPNOTSUPP; | |
1391 | ||
1392 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1393 | return -EOPNOTSUPP; | |
1394 | ||
1395 | if ((arg & MMC_SECURE_ARGS) && | |
1396 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1397 | return -EOPNOTSUPP; | |
1398 | ||
1399 | if ((arg & MMC_TRIM_ARGS) && | |
1400 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1401 | return -EOPNOTSUPP; | |
1402 | ||
1403 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1404 | if (from % card->erase_size || nr % card->erase_size) | |
1405 | return -EINVAL; | |
1406 | } | |
1407 | ||
1408 | if (arg == MMC_ERASE_ARG) { | |
1409 | rem = from % card->erase_size; | |
1410 | if (rem) { | |
1411 | rem = card->erase_size - rem; | |
1412 | from += rem; | |
1413 | if (nr > rem) | |
1414 | nr -= rem; | |
1415 | else | |
1416 | return 0; | |
1417 | } | |
1418 | rem = nr % card->erase_size; | |
1419 | if (rem) | |
1420 | nr -= rem; | |
1421 | } | |
1422 | ||
1423 | if (nr == 0) | |
1424 | return 0; | |
1425 | ||
1426 | to = from + nr; | |
1427 | ||
1428 | if (to <= from) | |
1429 | return -EINVAL; | |
1430 | ||
1431 | /* 'from' and 'to' are inclusive */ | |
1432 | to -= 1; | |
1433 | ||
1434 | return mmc_do_erase(card, from, to, arg); | |
1435 | } | |
1436 | EXPORT_SYMBOL(mmc_erase); | |
1437 | ||
1438 | int mmc_can_erase(struct mmc_card *card) | |
1439 | { | |
1440 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1441 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1442 | return 1; | |
1443 | return 0; | |
1444 | } | |
1445 | EXPORT_SYMBOL(mmc_can_erase); | |
1446 | ||
1447 | int mmc_can_trim(struct mmc_card *card) | |
1448 | { | |
1449 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
1450 | return 1; | |
1451 | return 0; | |
1452 | } | |
1453 | EXPORT_SYMBOL(mmc_can_trim); | |
1454 | ||
1455 | int mmc_can_secure_erase_trim(struct mmc_card *card) | |
1456 | { | |
1457 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
1458 | return 1; | |
1459 | return 0; | |
1460 | } | |
1461 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
1462 | ||
1463 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
1464 | unsigned int nr) | |
1465 | { | |
1466 | if (!card->erase_size) | |
1467 | return 0; | |
1468 | if (from % card->erase_size || nr % card->erase_size) | |
1469 | return 0; | |
1470 | return 1; | |
1471 | } | |
1472 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 1473 | |
0f8d8ea6 AH |
1474 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
1475 | { | |
1476 | struct mmc_command cmd; | |
1477 | ||
1478 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
1479 | return 0; | |
1480 | ||
1481 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1482 | cmd.opcode = MMC_SET_BLOCKLEN; | |
1483 | cmd.arg = blocklen; | |
1484 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1485 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
1486 | } | |
1487 | EXPORT_SYMBOL(mmc_set_blocklen); | |
1488 | ||
807e8e40 AR |
1489 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
1490 | { | |
1491 | host->f_init = freq; | |
1492 | ||
1493 | #ifdef CONFIG_MMC_DEBUG | |
1494 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
1495 | mmc_hostname(host), __func__, host->f_init); | |
1496 | #endif | |
1497 | mmc_power_up(host); | |
1498 | sdio_reset(host); | |
1499 | mmc_go_idle(host); | |
1500 | ||
1501 | mmc_send_if_cond(host, host->ocr_avail); | |
1502 | ||
1503 | /* Order's important: probe SDIO, then SD, then MMC */ | |
1504 | if (!mmc_attach_sdio(host)) | |
1505 | return 0; | |
1506 | if (!mmc_attach_sd(host)) | |
1507 | return 0; | |
1508 | if (!mmc_attach_mmc(host)) | |
1509 | return 0; | |
1510 | ||
1511 | mmc_power_off(host); | |
1512 | return -EIO; | |
1513 | } | |
1514 | ||
b93931a6 | 1515 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 1516 | { |
807e8e40 | 1517 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
c4028958 DH |
1518 | struct mmc_host *host = |
1519 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 1520 | int i; |
4c2ef25f | 1521 | |
807e8e40 | 1522 | if (host->rescan_disable) |
4c2ef25f | 1523 | return; |
1da177e4 | 1524 | |
7ea239d9 | 1525 | mmc_bus_get(host); |
b855885e | 1526 | |
30201e7f OBC |
1527 | /* |
1528 | * if there is a _removable_ card registered, check whether it is | |
1529 | * still present | |
1530 | */ | |
1531 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 1532 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
1533 | host->bus_ops->detect(host); |
1534 | ||
c5841798 CB |
1535 | /* |
1536 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
1537 | * the card is no longer present. | |
1538 | */ | |
94d89efb | 1539 | mmc_bus_put(host); |
94d89efb JS |
1540 | mmc_bus_get(host); |
1541 | ||
1542 | /* if there still is a card present, stop here */ | |
1543 | if (host->bus_ops != NULL) { | |
7ea239d9 | 1544 | mmc_bus_put(host); |
94d89efb JS |
1545 | goto out; |
1546 | } | |
1da177e4 | 1547 | |
94d89efb JS |
1548 | /* |
1549 | * Only we can add a new handler, so it's safe to | |
1550 | * release the lock here. | |
1551 | */ | |
1552 | mmc_bus_put(host); | |
1da177e4 | 1553 | |
94d89efb JS |
1554 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
1555 | goto out; | |
1da177e4 | 1556 | |
807e8e40 | 1557 | mmc_claim_host(host); |
88ae8b86 | 1558 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
1559 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
1560 | break; | |
1561 | if (freqs[i] < host->f_min) | |
1562 | break; | |
88ae8b86 | 1563 | } |
807e8e40 AR |
1564 | mmc_release_host(host); |
1565 | ||
1566 | out: | |
28f52482 AV |
1567 | if (host->caps & MMC_CAP_NEEDS_POLL) |
1568 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
1569 | } |
1570 | ||
b93931a6 | 1571 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 1572 | { |
b93931a6 PO |
1573 | mmc_power_off(host); |
1574 | mmc_detect_change(host, 0); | |
1da177e4 LT |
1575 | } |
1576 | ||
b93931a6 | 1577 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 1578 | { |
3b91e550 | 1579 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
1580 | unsigned long flags; |
1581 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 1582 | host->removed = 1; |
1efd48b3 | 1583 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1584 | #endif |
1585 | ||
8ea926b2 AH |
1586 | if (host->caps & MMC_CAP_DISABLE) |
1587 | cancel_delayed_work(&host->disable); | |
d9bcbf34 | 1588 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
1589 | mmc_flush_scheduled_work(); |
1590 | ||
da68c4eb NP |
1591 | /* clear pm flags now and let card drivers set them as needed */ |
1592 | host->pm_flags = 0; | |
1593 | ||
7ea239d9 PO |
1594 | mmc_bus_get(host); |
1595 | if (host->bus_ops && !host->bus_dead) { | |
1596 | if (host->bus_ops->remove) | |
1597 | host->bus_ops->remove(host); | |
1598 | ||
1599 | mmc_claim_host(host); | |
1600 | mmc_detach_bus(host); | |
1601 | mmc_release_host(host); | |
53509f0f DK |
1602 | mmc_bus_put(host); |
1603 | return; | |
1da177e4 | 1604 | } |
7ea239d9 PO |
1605 | mmc_bus_put(host); |
1606 | ||
1607 | BUG_ON(host->card); | |
1da177e4 LT |
1608 | |
1609 | mmc_power_off(host); | |
1610 | } | |
1611 | ||
12ae637f | 1612 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 1613 | { |
12ae637f OBC |
1614 | int ret = 0; |
1615 | ||
eae1aeee AH |
1616 | mmc_bus_get(host); |
1617 | ||
1618 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1619 | mmc_bus_put(host); | |
12ae637f | 1620 | return -EINVAL; |
eae1aeee AH |
1621 | } |
1622 | ||
1623 | if (host->bus_ops->power_save) | |
12ae637f | 1624 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
1625 | |
1626 | mmc_bus_put(host); | |
1627 | ||
1628 | mmc_power_off(host); | |
12ae637f OBC |
1629 | |
1630 | return ret; | |
eae1aeee AH |
1631 | } |
1632 | EXPORT_SYMBOL(mmc_power_save_host); | |
1633 | ||
12ae637f | 1634 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 1635 | { |
12ae637f OBC |
1636 | int ret; |
1637 | ||
eae1aeee AH |
1638 | mmc_bus_get(host); |
1639 | ||
1640 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1641 | mmc_bus_put(host); | |
12ae637f | 1642 | return -EINVAL; |
eae1aeee AH |
1643 | } |
1644 | ||
1645 | mmc_power_up(host); | |
12ae637f | 1646 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
1647 | |
1648 | mmc_bus_put(host); | |
12ae637f OBC |
1649 | |
1650 | return ret; | |
eae1aeee AH |
1651 | } |
1652 | EXPORT_SYMBOL(mmc_power_restore_host); | |
1653 | ||
b1ebe384 JL |
1654 | int mmc_card_awake(struct mmc_host *host) |
1655 | { | |
1656 | int err = -ENOSYS; | |
1657 | ||
1658 | mmc_bus_get(host); | |
1659 | ||
1660 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1661 | err = host->bus_ops->awake(host); | |
1662 | ||
1663 | mmc_bus_put(host); | |
1664 | ||
1665 | return err; | |
1666 | } | |
1667 | EXPORT_SYMBOL(mmc_card_awake); | |
1668 | ||
1669 | int mmc_card_sleep(struct mmc_host *host) | |
1670 | { | |
1671 | int err = -ENOSYS; | |
1672 | ||
1673 | mmc_bus_get(host); | |
1674 | ||
1675 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1676 | err = host->bus_ops->sleep(host); | |
1677 | ||
1678 | mmc_bus_put(host); | |
1679 | ||
1680 | return err; | |
1681 | } | |
1682 | EXPORT_SYMBOL(mmc_card_sleep); | |
1683 | ||
1684 | int mmc_card_can_sleep(struct mmc_host *host) | |
1685 | { | |
1686 | struct mmc_card *card = host->card; | |
1687 | ||
1688 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
1689 | return 1; | |
1690 | return 0; | |
1691 | } | |
1692 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
1693 | ||
1da177e4 LT |
1694 | #ifdef CONFIG_PM |
1695 | ||
1696 | /** | |
1697 | * mmc_suspend_host - suspend a host | |
1698 | * @host: mmc host | |
1da177e4 | 1699 | */ |
1a13f8fa | 1700 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 1701 | { |
95cdfb72 NP |
1702 | int err = 0; |
1703 | ||
8ea926b2 AH |
1704 | if (host->caps & MMC_CAP_DISABLE) |
1705 | cancel_delayed_work(&host->disable); | |
7de427d0 | 1706 | cancel_delayed_work(&host->detect); |
b5af25be PO |
1707 | mmc_flush_scheduled_work(); |
1708 | ||
7ea239d9 PO |
1709 | mmc_bus_get(host); |
1710 | if (host->bus_ops && !host->bus_dead) { | |
6abaa0c9 | 1711 | if (host->bus_ops->suspend) |
95cdfb72 | 1712 | err = host->bus_ops->suspend(host); |
1c8cf9c9 OBC |
1713 | if (err == -ENOSYS || !host->bus_ops->resume) { |
1714 | /* | |
1715 | * We simply "remove" the card in this case. | |
1716 | * It will be redetected on resume. | |
1717 | */ | |
1718 | if (host->bus_ops->remove) | |
1719 | host->bus_ops->remove(host); | |
1720 | mmc_claim_host(host); | |
1721 | mmc_detach_bus(host); | |
1722 | mmc_release_host(host); | |
1723 | host->pm_flags = 0; | |
1724 | err = 0; | |
1725 | } | |
b5af25be | 1726 | } |
7ea239d9 PO |
1727 | mmc_bus_put(host); |
1728 | ||
da68c4eb | 1729 | if (!err && !(host->pm_flags & MMC_PM_KEEP_POWER)) |
95cdfb72 | 1730 | mmc_power_off(host); |
1da177e4 | 1731 | |
95cdfb72 | 1732 | return err; |
1da177e4 LT |
1733 | } |
1734 | ||
1735 | EXPORT_SYMBOL(mmc_suspend_host); | |
1736 | ||
1737 | /** | |
1738 | * mmc_resume_host - resume a previously suspended host | |
1739 | * @host: mmc host | |
1740 | */ | |
1741 | int mmc_resume_host(struct mmc_host *host) | |
1742 | { | |
95cdfb72 NP |
1743 | int err = 0; |
1744 | ||
6abaa0c9 PO |
1745 | mmc_bus_get(host); |
1746 | if (host->bus_ops && !host->bus_dead) { | |
da68c4eb NP |
1747 | if (!(host->pm_flags & MMC_PM_KEEP_POWER)) { |
1748 | mmc_power_up(host); | |
1749 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
1750 | /* |
1751 | * Tell runtime PM core we just powered up the card, | |
1752 | * since it still believes the card is powered off. | |
1753 | * Note that currently runtime PM is only enabled | |
1754 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
1755 | */ | |
1756 | if (mmc_card_sdio(host->card) && | |
1757 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
1758 | pm_runtime_disable(&host->card->dev); | |
1759 | pm_runtime_set_active(&host->card->dev); | |
1760 | pm_runtime_enable(&host->card->dev); | |
1761 | } | |
da68c4eb | 1762 | } |
6abaa0c9 | 1763 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
1764 | err = host->bus_ops->resume(host); |
1765 | if (err) { | |
1766 | printk(KERN_WARNING "%s: error %d during resume " | |
1767 | "(card was removed?)\n", | |
1768 | mmc_hostname(host), err); | |
95cdfb72 NP |
1769 | err = 0; |
1770 | } | |
6abaa0c9 PO |
1771 | } |
1772 | mmc_bus_put(host); | |
1773 | ||
95cdfb72 | 1774 | return err; |
1da177e4 | 1775 | } |
1da177e4 LT |
1776 | EXPORT_SYMBOL(mmc_resume_host); |
1777 | ||
4c2ef25f ML |
1778 | /* Do the card removal on suspend if card is assumed removeable |
1779 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
1780 | to sync the card. | |
1781 | */ | |
1782 | int mmc_pm_notify(struct notifier_block *notify_block, | |
1783 | unsigned long mode, void *unused) | |
1784 | { | |
1785 | struct mmc_host *host = container_of( | |
1786 | notify_block, struct mmc_host, pm_notify); | |
1787 | unsigned long flags; | |
1788 | ||
1789 | ||
1790 | switch (mode) { | |
1791 | case PM_HIBERNATION_PREPARE: | |
1792 | case PM_SUSPEND_PREPARE: | |
1793 | ||
1794 | spin_lock_irqsave(&host->lock, flags); | |
1795 | host->rescan_disable = 1; | |
1796 | spin_unlock_irqrestore(&host->lock, flags); | |
1797 | cancel_delayed_work_sync(&host->detect); | |
1798 | ||
1799 | if (!host->bus_ops || host->bus_ops->suspend) | |
1800 | break; | |
1801 | ||
1802 | mmc_claim_host(host); | |
1803 | ||
1804 | if (host->bus_ops->remove) | |
1805 | host->bus_ops->remove(host); | |
1806 | ||
1807 | mmc_detach_bus(host); | |
1808 | mmc_release_host(host); | |
1809 | host->pm_flags = 0; | |
1810 | break; | |
1811 | ||
1812 | case PM_POST_SUSPEND: | |
1813 | case PM_POST_HIBERNATION: | |
274476f8 | 1814 | case PM_POST_RESTORE: |
4c2ef25f ML |
1815 | |
1816 | spin_lock_irqsave(&host->lock, flags); | |
1817 | host->rescan_disable = 0; | |
1818 | spin_unlock_irqrestore(&host->lock, flags); | |
1819 | mmc_detect_change(host, 0); | |
1820 | ||
1821 | } | |
1822 | ||
1823 | return 0; | |
1824 | } | |
1da177e4 LT |
1825 | #endif |
1826 | ||
ffce2e7e PO |
1827 | static int __init mmc_init(void) |
1828 | { | |
1829 | int ret; | |
1830 | ||
0d9ee5b2 | 1831 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
1832 | if (!workqueue) |
1833 | return -ENOMEM; | |
1834 | ||
1835 | ret = mmc_register_bus(); | |
e29a7d73 PO |
1836 | if (ret) |
1837 | goto destroy_workqueue; | |
1838 | ||
1839 | ret = mmc_register_host_class(); | |
1840 | if (ret) | |
1841 | goto unregister_bus; | |
1842 | ||
1843 | ret = sdio_register_bus(); | |
1844 | if (ret) | |
1845 | goto unregister_host_class; | |
1846 | ||
1847 | return 0; | |
1848 | ||
1849 | unregister_host_class: | |
1850 | mmc_unregister_host_class(); | |
1851 | unregister_bus: | |
1852 | mmc_unregister_bus(); | |
1853 | destroy_workqueue: | |
1854 | destroy_workqueue(workqueue); | |
1855 | ||
ffce2e7e PO |
1856 | return ret; |
1857 | } | |
1858 | ||
1859 | static void __exit mmc_exit(void) | |
1860 | { | |
e29a7d73 | 1861 | sdio_unregister_bus(); |
ffce2e7e PO |
1862 | mmc_unregister_host_class(); |
1863 | mmc_unregister_bus(); | |
1864 | destroy_workqueue(workqueue); | |
1865 | } | |
1866 | ||
26074962 | 1867 | subsys_initcall(mmc_init); |
ffce2e7e PO |
1868 | module_exit(mmc_exit); |
1869 | ||
1da177e4 | 1870 | MODULE_LICENSE("GPL"); |