Commit | Line | Data |
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1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
ad3868b2 | 6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
af8350c7 | 21 | #include <linux/leds.h> |
b57c43ad | 22 | #include <linux/scatterlist.h> |
86e8286a | 23 | #include <linux/log2.h> |
5c13941a | 24 | #include <linux/regulator/consumer.h> |
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 LT |
169 | |
170 | mrq->cmd->error = 0; | |
171 | mrq->cmd->mrq = mrq; | |
172 | if (mrq->data) { | |
fe4a3c7a | 173 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
174 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
175 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
176 | host->max_req_size); | |
fe4a3c7a | 177 | |
976d9276 PO |
178 | #ifdef CONFIG_MMC_DEBUG |
179 | sz = 0; | |
a84756c5 PO |
180 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
181 | sz += sg->length; | |
976d9276 PO |
182 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
183 | #endif | |
184 | ||
1da177e4 LT |
185 | mrq->cmd->data = mrq->data; |
186 | mrq->data->error = 0; | |
187 | mrq->data->mrq = mrq; | |
188 | if (mrq->stop) { | |
189 | mrq->data->stop = mrq->stop; | |
190 | mrq->stop->error = 0; | |
191 | mrq->stop->mrq = mrq; | |
192 | } | |
193 | } | |
04566831 | 194 | mmc_host_clk_ungate(host); |
66c036e0 | 195 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
196 | host->ops->request(host, mrq); |
197 | } | |
198 | ||
1da177e4 LT |
199 | static void mmc_wait_done(struct mmc_request *mrq) |
200 | { | |
201 | complete(mrq->done_data); | |
202 | } | |
203 | ||
67a61c48 PO |
204 | /** |
205 | * mmc_wait_for_req - start a request and wait for completion | |
206 | * @host: MMC host to start command | |
207 | * @mrq: MMC request to start | |
208 | * | |
209 | * Start a new MMC custom command request for a host, and wait | |
210 | * for the command to complete. Does not attempt to parse the | |
211 | * response. | |
212 | */ | |
213 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 214 | { |
0afffc72 | 215 | DECLARE_COMPLETION_ONSTACK(complete); |
1da177e4 LT |
216 | |
217 | mrq->done_data = &complete; | |
218 | mrq->done = mmc_wait_done; | |
219 | ||
220 | mmc_start_request(host, mrq); | |
221 | ||
222 | wait_for_completion(&complete); | |
1da177e4 LT |
223 | } |
224 | ||
225 | EXPORT_SYMBOL(mmc_wait_for_req); | |
226 | ||
227 | /** | |
228 | * mmc_wait_for_cmd - start a command and wait for completion | |
229 | * @host: MMC host to start command | |
230 | * @cmd: MMC command to start | |
231 | * @retries: maximum number of retries | |
232 | * | |
233 | * Start a new MMC command for a host, and wait for the command | |
234 | * to complete. Return any error that occurred while the command | |
235 | * was executing. Do not attempt to parse the response. | |
236 | */ | |
237 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
238 | { | |
24f5b53b | 239 | struct mmc_request mrq = {0}; |
1da177e4 | 240 | |
d84075c8 | 241 | WARN_ON(!host->claimed); |
1da177e4 | 242 | |
1da177e4 LT |
243 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
244 | cmd->retries = retries; | |
245 | ||
246 | mrq.cmd = cmd; | |
247 | cmd->data = NULL; | |
248 | ||
249 | mmc_wait_for_req(host, &mrq); | |
250 | ||
251 | return cmd->error; | |
252 | } | |
253 | ||
254 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
255 | ||
d773d725 RK |
256 | /** |
257 | * mmc_set_data_timeout - set the timeout for a data command | |
258 | * @data: data phase for command | |
259 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
260 | * |
261 | * Computes the data timeout parameters according to the | |
262 | * correct algorithm given the card type. | |
d773d725 | 263 | */ |
b146d26a | 264 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
265 | { |
266 | unsigned int mult; | |
267 | ||
e6f918bf PO |
268 | /* |
269 | * SDIO cards only define an upper 1 s limit on access. | |
270 | */ | |
271 | if (mmc_card_sdio(card)) { | |
272 | data->timeout_ns = 1000000000; | |
273 | data->timeout_clks = 0; | |
274 | return; | |
275 | } | |
276 | ||
d773d725 RK |
277 | /* |
278 | * SD cards use a 100 multiplier rather than 10 | |
279 | */ | |
280 | mult = mmc_card_sd(card) ? 100 : 10; | |
281 | ||
282 | /* | |
283 | * Scale up the multiplier (and therefore the timeout) by | |
284 | * the r2w factor for writes. | |
285 | */ | |
b146d26a | 286 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
287 | mult <<= card->csd.r2w_factor; |
288 | ||
289 | data->timeout_ns = card->csd.tacc_ns * mult; | |
290 | data->timeout_clks = card->csd.tacc_clks * mult; | |
291 | ||
292 | /* | |
293 | * SD cards also have an upper limit on the timeout. | |
294 | */ | |
295 | if (mmc_card_sd(card)) { | |
296 | unsigned int timeout_us, limit_us; | |
297 | ||
298 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
299 | if (mmc_host_clk_rate(card->host)) |
300 | timeout_us += data->timeout_clks * 1000 / | |
301 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 302 | |
b146d26a | 303 | if (data->flags & MMC_DATA_WRITE) |
493890e7 PO |
304 | /* |
305 | * The limit is really 250 ms, but that is | |
306 | * insufficient for some crappy cards. | |
307 | */ | |
308 | limit_us = 300000; | |
d773d725 RK |
309 | else |
310 | limit_us = 100000; | |
311 | ||
fba68bd2 PL |
312 | /* |
313 | * SDHC cards always use these fixed values. | |
314 | */ | |
315 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
316 | data->timeout_ns = limit_us * 1000; |
317 | data->timeout_clks = 0; | |
318 | } | |
319 | } | |
c0c88871 WM |
320 | /* |
321 | * Some cards need very high timeouts if driven in SPI mode. | |
322 | * The worst observed timeout was 900ms after writing a | |
323 | * continuous stream of data until the internal logic | |
324 | * overflowed. | |
325 | */ | |
326 | if (mmc_host_is_spi(card->host)) { | |
327 | if (data->flags & MMC_DATA_WRITE) { | |
328 | if (data->timeout_ns < 1000000000) | |
329 | data->timeout_ns = 1000000000; /* 1s */ | |
330 | } else { | |
331 | if (data->timeout_ns < 100000000) | |
332 | data->timeout_ns = 100000000; /* 100ms */ | |
333 | } | |
334 | } | |
d773d725 RK |
335 | } |
336 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
337 | ||
ad3868b2 PO |
338 | /** |
339 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
340 | * @card: the MMC card associated with the data transfer | |
341 | * @sz: original transfer size | |
342 | * | |
343 | * Pads the original data size with a number of extra bytes in | |
344 | * order to avoid controller bugs and/or performance hits | |
345 | * (e.g. some controllers revert to PIO for certain sizes). | |
346 | * | |
347 | * Returns the improved size, which might be unmodified. | |
348 | * | |
349 | * Note that this function is only relevant when issuing a | |
350 | * single scatter gather entry. | |
351 | */ | |
352 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
353 | { | |
354 | /* | |
355 | * FIXME: We don't have a system for the controller to tell | |
356 | * the core about its problems yet, so for now we just 32-bit | |
357 | * align the size. | |
358 | */ | |
359 | sz = ((sz + 3) / 4) * 4; | |
360 | ||
361 | return sz; | |
362 | } | |
363 | EXPORT_SYMBOL(mmc_align_data_size); | |
364 | ||
8ea926b2 AH |
365 | /** |
366 | * mmc_host_enable - enable a host. | |
367 | * @host: mmc host to enable | |
368 | * | |
369 | * Hosts that support power saving can use the 'enable' and 'disable' | |
370 | * methods to exit and enter power saving states. For more information | |
371 | * see comments for struct mmc_host_ops. | |
372 | */ | |
373 | int mmc_host_enable(struct mmc_host *host) | |
374 | { | |
375 | if (!(host->caps & MMC_CAP_DISABLE)) | |
376 | return 0; | |
377 | ||
378 | if (host->en_dis_recurs) | |
379 | return 0; | |
380 | ||
381 | if (host->nesting_cnt++) | |
382 | return 0; | |
383 | ||
384 | cancel_delayed_work_sync(&host->disable); | |
385 | ||
386 | if (host->enabled) | |
387 | return 0; | |
388 | ||
389 | if (host->ops->enable) { | |
390 | int err; | |
391 | ||
392 | host->en_dis_recurs = 1; | |
393 | err = host->ops->enable(host); | |
394 | host->en_dis_recurs = 0; | |
395 | ||
396 | if (err) { | |
397 | pr_debug("%s: enable error %d\n", | |
398 | mmc_hostname(host), err); | |
399 | return err; | |
400 | } | |
401 | } | |
402 | host->enabled = 1; | |
403 | return 0; | |
404 | } | |
405 | EXPORT_SYMBOL(mmc_host_enable); | |
406 | ||
407 | static int mmc_host_do_disable(struct mmc_host *host, int lazy) | |
408 | { | |
409 | if (host->ops->disable) { | |
410 | int err; | |
411 | ||
412 | host->en_dis_recurs = 1; | |
413 | err = host->ops->disable(host, lazy); | |
414 | host->en_dis_recurs = 0; | |
415 | ||
416 | if (err < 0) { | |
417 | pr_debug("%s: disable error %d\n", | |
418 | mmc_hostname(host), err); | |
419 | return err; | |
420 | } | |
421 | if (err > 0) { | |
422 | unsigned long delay = msecs_to_jiffies(err); | |
423 | ||
424 | mmc_schedule_delayed_work(&host->disable, delay); | |
425 | } | |
426 | } | |
427 | host->enabled = 0; | |
428 | return 0; | |
429 | } | |
430 | ||
431 | /** | |
432 | * mmc_host_disable - disable a host. | |
433 | * @host: mmc host to disable | |
434 | * | |
435 | * Hosts that support power saving can use the 'enable' and 'disable' | |
436 | * methods to exit and enter power saving states. For more information | |
437 | * see comments for struct mmc_host_ops. | |
438 | */ | |
439 | int mmc_host_disable(struct mmc_host *host) | |
440 | { | |
441 | int err; | |
442 | ||
443 | if (!(host->caps & MMC_CAP_DISABLE)) | |
444 | return 0; | |
445 | ||
446 | if (host->en_dis_recurs) | |
447 | return 0; | |
448 | ||
449 | if (--host->nesting_cnt) | |
450 | return 0; | |
451 | ||
452 | if (!host->enabled) | |
453 | return 0; | |
454 | ||
455 | err = mmc_host_do_disable(host, 0); | |
456 | return err; | |
457 | } | |
458 | EXPORT_SYMBOL(mmc_host_disable); | |
459 | ||
1da177e4 | 460 | /** |
2342f332 | 461 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 462 | * @host: mmc host to claim |
2342f332 | 463 | * @abort: whether or not the operation should be aborted |
1da177e4 | 464 | * |
2342f332 NP |
465 | * Claim a host for a set of operations. If @abort is non null and |
466 | * dereference a non-zero value then this will return prematurely with | |
467 | * that non-zero value without acquiring the lock. Returns zero | |
468 | * with the lock held otherwise. | |
1da177e4 | 469 | */ |
2342f332 | 470 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
471 | { |
472 | DECLARE_WAITQUEUE(wait, current); | |
473 | unsigned long flags; | |
2342f332 | 474 | int stop; |
1da177e4 | 475 | |
cf795bfb PO |
476 | might_sleep(); |
477 | ||
1da177e4 LT |
478 | add_wait_queue(&host->wq, &wait); |
479 | spin_lock_irqsave(&host->lock, flags); | |
480 | while (1) { | |
481 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 482 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 483 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
484 | break; |
485 | spin_unlock_irqrestore(&host->lock, flags); | |
486 | schedule(); | |
487 | spin_lock_irqsave(&host->lock, flags); | |
488 | } | |
489 | set_current_state(TASK_RUNNING); | |
319a3f14 | 490 | if (!stop) { |
2342f332 | 491 | host->claimed = 1; |
319a3f14 AH |
492 | host->claimer = current; |
493 | host->claim_cnt += 1; | |
494 | } else | |
2342f332 | 495 | wake_up(&host->wq); |
1da177e4 LT |
496 | spin_unlock_irqrestore(&host->lock, flags); |
497 | remove_wait_queue(&host->wq, &wait); | |
8ea926b2 AH |
498 | if (!stop) |
499 | mmc_host_enable(host); | |
2342f332 | 500 | return stop; |
1da177e4 LT |
501 | } |
502 | ||
2342f332 | 503 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 504 | |
319a3f14 AH |
505 | /** |
506 | * mmc_try_claim_host - try exclusively to claim a host | |
507 | * @host: mmc host to claim | |
508 | * | |
509 | * Returns %1 if the host is claimed, %0 otherwise. | |
510 | */ | |
511 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
512 | { |
513 | int claimed_host = 0; | |
514 | unsigned long flags; | |
515 | ||
516 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 517 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 518 | host->claimed = 1; |
319a3f14 AH |
519 | host->claimer = current; |
520 | host->claim_cnt += 1; | |
8ea926b2 AH |
521 | claimed_host = 1; |
522 | } | |
523 | spin_unlock_irqrestore(&host->lock, flags); | |
524 | return claimed_host; | |
525 | } | |
319a3f14 | 526 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 527 | |
ab1efd27 UH |
528 | /** |
529 | * mmc_do_release_host - release a claimed host | |
530 | * @host: mmc host to release | |
531 | * | |
532 | * If you successfully claimed a host, this function will | |
533 | * release it again. | |
534 | */ | |
535 | void mmc_do_release_host(struct mmc_host *host) | |
8ea926b2 AH |
536 | { |
537 | unsigned long flags; | |
538 | ||
539 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 AH |
540 | if (--host->claim_cnt) { |
541 | /* Release for nested claim */ | |
542 | spin_unlock_irqrestore(&host->lock, flags); | |
543 | } else { | |
544 | host->claimed = 0; | |
545 | host->claimer = NULL; | |
546 | spin_unlock_irqrestore(&host->lock, flags); | |
547 | wake_up(&host->wq); | |
548 | } | |
8ea926b2 | 549 | } |
ab1efd27 | 550 | EXPORT_SYMBOL(mmc_do_release_host); |
8ea926b2 AH |
551 | |
552 | void mmc_host_deeper_disable(struct work_struct *work) | |
553 | { | |
554 | struct mmc_host *host = | |
555 | container_of(work, struct mmc_host, disable.work); | |
556 | ||
557 | /* If the host is claimed then we do not want to disable it anymore */ | |
558 | if (!mmc_try_claim_host(host)) | |
559 | return; | |
560 | mmc_host_do_disable(host, 1); | |
561 | mmc_do_release_host(host); | |
562 | } | |
563 | ||
564 | /** | |
565 | * mmc_host_lazy_disable - lazily disable a host. | |
566 | * @host: mmc host to disable | |
567 | * | |
568 | * Hosts that support power saving can use the 'enable' and 'disable' | |
569 | * methods to exit and enter power saving states. For more information | |
570 | * see comments for struct mmc_host_ops. | |
571 | */ | |
572 | int mmc_host_lazy_disable(struct mmc_host *host) | |
573 | { | |
574 | if (!(host->caps & MMC_CAP_DISABLE)) | |
575 | return 0; | |
576 | ||
577 | if (host->en_dis_recurs) | |
578 | return 0; | |
579 | ||
580 | if (--host->nesting_cnt) | |
581 | return 0; | |
582 | ||
583 | if (!host->enabled) | |
584 | return 0; | |
585 | ||
586 | if (host->disable_delay) { | |
587 | mmc_schedule_delayed_work(&host->disable, | |
588 | msecs_to_jiffies(host->disable_delay)); | |
589 | return 0; | |
590 | } else | |
591 | return mmc_host_do_disable(host, 1); | |
592 | } | |
593 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
594 | ||
1da177e4 LT |
595 | /** |
596 | * mmc_release_host - release a host | |
597 | * @host: mmc host to release | |
598 | * | |
599 | * Release a MMC host, allowing others to claim the host | |
600 | * for their operations. | |
601 | */ | |
602 | void mmc_release_host(struct mmc_host *host) | |
603 | { | |
d84075c8 | 604 | WARN_ON(!host->claimed); |
1da177e4 | 605 | |
8ea926b2 | 606 | mmc_host_lazy_disable(host); |
1da177e4 | 607 | |
8ea926b2 | 608 | mmc_do_release_host(host); |
1da177e4 LT |
609 | } |
610 | ||
611 | EXPORT_SYMBOL(mmc_release_host); | |
612 | ||
7ea239d9 PO |
613 | /* |
614 | * Internal function that does the actual ios call to the host driver, | |
615 | * optionally printing some debug output. | |
616 | */ | |
920e70c5 RK |
617 | static inline void mmc_set_ios(struct mmc_host *host) |
618 | { | |
619 | struct mmc_ios *ios = &host->ios; | |
620 | ||
cd9277c0 PO |
621 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
622 | "width %u timing %u\n", | |
920e70c5 RK |
623 | mmc_hostname(host), ios->clock, ios->bus_mode, |
624 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 625 | ios->bus_width, ios->timing); |
fba68bd2 | 626 | |
04566831 LW |
627 | if (ios->clock > 0) |
628 | mmc_set_ungated(host); | |
920e70c5 RK |
629 | host->ops->set_ios(host, ios); |
630 | } | |
631 | ||
7ea239d9 PO |
632 | /* |
633 | * Control chip select pin on a host. | |
634 | */ | |
da7fbe58 | 635 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 636 | { |
da7fbe58 PO |
637 | host->ios.chip_select = mode; |
638 | mmc_set_ios(host); | |
1da177e4 LT |
639 | } |
640 | ||
7ea239d9 PO |
641 | /* |
642 | * Sets the host clock to the highest possible frequency that | |
643 | * is below "hz". | |
644 | */ | |
645 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) | |
646 | { | |
647 | WARN_ON(hz < host->f_min); | |
648 | ||
649 | if (hz > host->f_max) | |
650 | hz = host->f_max; | |
651 | ||
652 | host->ios.clock = hz; | |
653 | mmc_set_ios(host); | |
654 | } | |
655 | ||
04566831 LW |
656 | #ifdef CONFIG_MMC_CLKGATE |
657 | /* | |
658 | * This gates the clock by setting it to 0 Hz. | |
659 | */ | |
660 | void mmc_gate_clock(struct mmc_host *host) | |
661 | { | |
662 | unsigned long flags; | |
663 | ||
664 | spin_lock_irqsave(&host->clk_lock, flags); | |
665 | host->clk_old = host->ios.clock; | |
666 | host->ios.clock = 0; | |
667 | host->clk_gated = true; | |
668 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
669 | mmc_set_ios(host); | |
670 | } | |
671 | ||
672 | /* | |
673 | * This restores the clock from gating by using the cached | |
674 | * clock value. | |
675 | */ | |
676 | void mmc_ungate_clock(struct mmc_host *host) | |
677 | { | |
678 | /* | |
679 | * We should previously have gated the clock, so the clock shall | |
680 | * be 0 here! The clock may however be 0 during initialization, | |
681 | * when some request operations are performed before setting | |
682 | * the frequency. When ungate is requested in that situation | |
683 | * we just ignore the call. | |
684 | */ | |
685 | if (host->clk_old) { | |
686 | BUG_ON(host->ios.clock); | |
687 | /* This call will also set host->clk_gated to false */ | |
688 | mmc_set_clock(host, host->clk_old); | |
689 | } | |
690 | } | |
691 | ||
692 | void mmc_set_ungated(struct mmc_host *host) | |
693 | { | |
694 | unsigned long flags; | |
695 | ||
696 | /* | |
697 | * We've been given a new frequency while the clock is gated, | |
698 | * so make sure we regard this as ungating it. | |
699 | */ | |
700 | spin_lock_irqsave(&host->clk_lock, flags); | |
701 | host->clk_gated = false; | |
702 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
703 | } | |
704 | ||
705 | #else | |
706 | void mmc_set_ungated(struct mmc_host *host) | |
707 | { | |
708 | } | |
709 | #endif | |
710 | ||
7ea239d9 PO |
711 | /* |
712 | * Change the bus mode (open drain/push-pull) of a host. | |
713 | */ | |
714 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
715 | { | |
716 | host->ios.bus_mode = mode; | |
717 | mmc_set_ios(host); | |
718 | } | |
719 | ||
0f8d8ea6 AH |
720 | /* |
721 | * Change data bus width of a host. | |
722 | */ | |
723 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
724 | { | |
4c4cb171 PR |
725 | host->ios.bus_width = width; |
726 | mmc_set_ios(host); | |
0f8d8ea6 AH |
727 | } |
728 | ||
86e8286a AV |
729 | /** |
730 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
731 | * @vdd: voltage (mV) | |
732 | * @low_bits: prefer low bits in boundary cases | |
733 | * | |
734 | * This function returns the OCR bit number according to the provided @vdd | |
735 | * value. If conversion is not possible a negative errno value returned. | |
736 | * | |
737 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
738 | * on boundary voltages. For example, | |
739 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
740 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
741 | * | |
742 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
743 | */ | |
744 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
745 | { | |
746 | const int max_bit = ilog2(MMC_VDD_35_36); | |
747 | int bit; | |
748 | ||
749 | if (vdd < 1650 || vdd > 3600) | |
750 | return -EINVAL; | |
751 | ||
752 | if (vdd >= 1650 && vdd <= 1950) | |
753 | return ilog2(MMC_VDD_165_195); | |
754 | ||
755 | if (low_bits) | |
756 | vdd -= 1; | |
757 | ||
758 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
759 | bit = (vdd - 2000) / 100 + 8; | |
760 | if (bit > max_bit) | |
761 | return max_bit; | |
762 | return bit; | |
763 | } | |
764 | ||
765 | /** | |
766 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
767 | * @vdd_min: minimum voltage value (mV) | |
768 | * @vdd_max: maximum voltage value (mV) | |
769 | * | |
770 | * This function returns the OCR mask bits according to the provided @vdd_min | |
771 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
772 | * | |
773 | * Notes wrt boundary cases: | |
774 | * This function sets the OCR bits for all boundary voltages, for example | |
775 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
776 | * MMC_VDD_34_35 mask. | |
777 | */ | |
778 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
779 | { | |
780 | u32 mask = 0; | |
781 | ||
782 | if (vdd_max < vdd_min) | |
783 | return 0; | |
784 | ||
785 | /* Prefer high bits for the boundary vdd_max values. */ | |
786 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
787 | if (vdd_max < 0) | |
788 | return 0; | |
789 | ||
790 | /* Prefer low bits for the boundary vdd_min values. */ | |
791 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
792 | if (vdd_min < 0) | |
793 | return 0; | |
794 | ||
795 | /* Fill the mask, from max bit to min bit. */ | |
796 | while (vdd_max >= vdd_min) | |
797 | mask |= 1 << vdd_max--; | |
798 | ||
799 | return mask; | |
800 | } | |
801 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
802 | ||
5c13941a DB |
803 | #ifdef CONFIG_REGULATOR |
804 | ||
805 | /** | |
806 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
807 | * @supply: regulator to use | |
808 | * | |
809 | * This returns either a negative errno, or a mask of voltages that | |
810 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
811 | * regulator. This would normally be called before registering the | |
812 | * MMC host adapter. | |
813 | */ | |
814 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
815 | { | |
816 | int result = 0; | |
817 | int count; | |
818 | int i; | |
819 | ||
820 | count = regulator_count_voltages(supply); | |
821 | if (count < 0) | |
822 | return count; | |
823 | ||
824 | for (i = 0; i < count; i++) { | |
825 | int vdd_uV; | |
826 | int vdd_mV; | |
827 | ||
828 | vdd_uV = regulator_list_voltage(supply, i); | |
829 | if (vdd_uV <= 0) | |
830 | continue; | |
831 | ||
832 | vdd_mV = vdd_uV / 1000; | |
833 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
834 | } | |
835 | ||
836 | return result; | |
837 | } | |
838 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
839 | ||
840 | /** | |
841 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 842 | * @mmc: the host to regulate |
5c13941a | 843 | * @supply: regulator to use |
99fc5131 | 844 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
845 | * |
846 | * Returns zero on success, else negative errno. | |
847 | * | |
848 | * MMC host drivers may use this to enable or disable a regulator using | |
849 | * a particular supply voltage. This would normally be called from the | |
850 | * set_ios() method. | |
851 | */ | |
99fc5131 LW |
852 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
853 | struct regulator *supply, | |
854 | unsigned short vdd_bit) | |
5c13941a DB |
855 | { |
856 | int result = 0; | |
857 | int min_uV, max_uV; | |
5c13941a DB |
858 | |
859 | if (vdd_bit) { | |
860 | int tmp; | |
861 | int voltage; | |
862 | ||
863 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
864 | * bits this regulator doesn't quite support ... don't | |
865 | * be too picky, most cards and regulators are OK with | |
866 | * a 0.1V range goof (it's a small error percentage). | |
867 | */ | |
868 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
869 | if (tmp == 0) { | |
870 | min_uV = 1650 * 1000; | |
871 | max_uV = 1950 * 1000; | |
872 | } else { | |
873 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
874 | max_uV = min_uV + 100 * 1000; | |
875 | } | |
876 | ||
877 | /* avoid needless changes to this voltage; the regulator | |
878 | * might not allow this operation | |
879 | */ | |
880 | voltage = regulator_get_voltage(supply); | |
881 | if (voltage < 0) | |
882 | result = voltage; | |
883 | else if (voltage < min_uV || voltage > max_uV) | |
884 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
885 | else | |
886 | result = 0; | |
887 | ||
99fc5131 | 888 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 889 | result = regulator_enable(supply); |
99fc5131 LW |
890 | if (!result) |
891 | mmc->regulator_enabled = true; | |
892 | } | |
893 | } else if (mmc->regulator_enabled) { | |
5c13941a | 894 | result = regulator_disable(supply); |
99fc5131 LW |
895 | if (result == 0) |
896 | mmc->regulator_enabled = false; | |
5c13941a DB |
897 | } |
898 | ||
99fc5131 LW |
899 | if (result) |
900 | dev_err(mmc_dev(mmc), | |
901 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
902 | return result; |
903 | } | |
904 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
905 | ||
99fc5131 | 906 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 907 | |
1da177e4 LT |
908 | /* |
909 | * Mask off any voltages we don't support and select | |
910 | * the lowest voltage | |
911 | */ | |
7ea239d9 | 912 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
913 | { |
914 | int bit; | |
915 | ||
916 | ocr &= host->ocr_avail; | |
917 | ||
918 | bit = ffs(ocr); | |
919 | if (bit) { | |
920 | bit -= 1; | |
921 | ||
63ef731a | 922 | ocr &= 3 << bit; |
1da177e4 LT |
923 | |
924 | host->ios.vdd = bit; | |
920e70c5 | 925 | mmc_set_ios(host); |
1da177e4 | 926 | } else { |
f6e10b86 DB |
927 | pr_warning("%s: host doesn't support card's voltages\n", |
928 | mmc_hostname(host)); | |
1da177e4 LT |
929 | ocr = 0; |
930 | } | |
931 | ||
932 | return ocr; | |
933 | } | |
934 | ||
261bbd46 | 935 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11) |
f2119df6 AN |
936 | { |
937 | struct mmc_command cmd = {0}; | |
938 | int err = 0; | |
939 | ||
940 | BUG_ON(!host); | |
941 | ||
942 | /* | |
943 | * Send CMD11 only if the request is to switch the card to | |
944 | * 1.8V signalling. | |
945 | */ | |
261bbd46 | 946 | if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) { |
f2119df6 AN |
947 | cmd.opcode = SD_SWITCH_VOLTAGE; |
948 | cmd.arg = 0; | |
949 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
950 | ||
951 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
952 | if (err) | |
953 | return err; | |
954 | ||
955 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
956 | return -EIO; | |
957 | } | |
958 | ||
959 | host->ios.signal_voltage = signal_voltage; | |
960 | ||
961 | if (host->ops->start_signal_voltage_switch) | |
962 | err = host->ops->start_signal_voltage_switch(host, &host->ios); | |
963 | ||
964 | return err; | |
965 | } | |
966 | ||
b57c43ad | 967 | /* |
7ea239d9 | 968 | * Select timing parameters for host. |
b57c43ad | 969 | */ |
7ea239d9 | 970 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 971 | { |
7ea239d9 PO |
972 | host->ios.timing = timing; |
973 | mmc_set_ios(host); | |
b57c43ad PO |
974 | } |
975 | ||
d6d50a15 AN |
976 | /* |
977 | * Select appropriate driver type for host. | |
978 | */ | |
979 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
980 | { | |
981 | host->ios.drv_type = drv_type; | |
982 | mmc_set_ios(host); | |
983 | } | |
984 | ||
1da177e4 | 985 | /* |
45f8245b RK |
986 | * Apply power to the MMC stack. This is a two-stage process. |
987 | * First, we enable power to the card without the clock running. | |
988 | * We then wait a bit for the power to stabilise. Finally, | |
989 | * enable the bus drivers and clock to the card. | |
990 | * | |
991 | * We must _NOT_ enable the clock prior to power stablising. | |
992 | * | |
993 | * If a host does all the power sequencing itself, ignore the | |
994 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
995 | */ |
996 | static void mmc_power_up(struct mmc_host *host) | |
997 | { | |
500f3564 BR |
998 | int bit; |
999 | ||
1000 | /* If ocr is set, we use it */ | |
1001 | if (host->ocr) | |
1002 | bit = ffs(host->ocr) - 1; | |
1003 | else | |
1004 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1005 | |
1006 | host->ios.vdd = bit; | |
af517150 DB |
1007 | if (mmc_host_is_spi(host)) { |
1008 | host->ios.chip_select = MMC_CS_HIGH; | |
1009 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1010 | } else { | |
1011 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1012 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1013 | } | |
1da177e4 | 1014 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1015 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1016 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1017 | mmc_set_ios(host); |
1da177e4 | 1018 | |
f9996aee PO |
1019 | /* |
1020 | * This delay should be sufficient to allow the power supply | |
1021 | * to reach the minimum voltage. | |
1022 | */ | |
79bccc5a | 1023 | mmc_delay(10); |
1da177e4 | 1024 | |
88ae8b86 | 1025 | host->ios.clock = host->f_init; |
8dfd0374 | 1026 | |
1da177e4 | 1027 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1028 | mmc_set_ios(host); |
1da177e4 | 1029 | |
f9996aee PO |
1030 | /* |
1031 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1032 | * time required to reach a stable voltage. | |
1033 | */ | |
79bccc5a | 1034 | mmc_delay(10); |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | static void mmc_power_off(struct mmc_host *host) | |
1038 | { | |
1039 | host->ios.clock = 0; | |
1040 | host->ios.vdd = 0; | |
b33d46c3 UH |
1041 | |
1042 | /* | |
1043 | * Reset ocr mask to be the highest possible voltage supported for | |
1044 | * this mmc host. This value will be used at next power up. | |
1045 | */ | |
1046 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1047 | ||
af517150 DB |
1048 | if (!mmc_host_is_spi(host)) { |
1049 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1050 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1051 | } | |
1da177e4 | 1052 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1053 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1054 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1055 | mmc_set_ios(host); |
1da177e4 LT |
1056 | } |
1057 | ||
39361851 AB |
1058 | /* |
1059 | * Cleanup when the last reference to the bus operator is dropped. | |
1060 | */ | |
261172fd | 1061 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1062 | { |
1063 | BUG_ON(!host); | |
1064 | BUG_ON(host->bus_refs); | |
1065 | BUG_ON(!host->bus_dead); | |
1066 | ||
1067 | host->bus_ops = NULL; | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * Increase reference count of bus operator | |
1072 | */ | |
1073 | static inline void mmc_bus_get(struct mmc_host *host) | |
1074 | { | |
1075 | unsigned long flags; | |
1076 | ||
1077 | spin_lock_irqsave(&host->lock, flags); | |
1078 | host->bus_refs++; | |
1079 | spin_unlock_irqrestore(&host->lock, flags); | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Decrease reference count of bus operator and free it if | |
1084 | * it is the last reference. | |
1085 | */ | |
1086 | static inline void mmc_bus_put(struct mmc_host *host) | |
1087 | { | |
1088 | unsigned long flags; | |
1089 | ||
1090 | spin_lock_irqsave(&host->lock, flags); | |
1091 | host->bus_refs--; | |
1092 | if ((host->bus_refs == 0) && host->bus_ops) | |
1093 | __mmc_release_bus(host); | |
1094 | spin_unlock_irqrestore(&host->lock, flags); | |
1095 | } | |
1096 | ||
1da177e4 | 1097 | /* |
7ea239d9 PO |
1098 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1099 | * host at any given time. | |
1da177e4 | 1100 | */ |
7ea239d9 | 1101 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1102 | { |
7ea239d9 | 1103 | unsigned long flags; |
e45a1bd2 | 1104 | |
7ea239d9 PO |
1105 | BUG_ON(!host); |
1106 | BUG_ON(!ops); | |
b855885e | 1107 | |
d84075c8 | 1108 | WARN_ON(!host->claimed); |
bce40a36 | 1109 | |
7ea239d9 | 1110 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1111 | |
7ea239d9 PO |
1112 | BUG_ON(host->bus_ops); |
1113 | BUG_ON(host->bus_refs); | |
b57c43ad | 1114 | |
7ea239d9 PO |
1115 | host->bus_ops = ops; |
1116 | host->bus_refs = 1; | |
1117 | host->bus_dead = 0; | |
b57c43ad | 1118 | |
7ea239d9 | 1119 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1120 | } |
1121 | ||
7ea239d9 PO |
1122 | /* |
1123 | * Remove the current bus handler from a host. Assumes that there are | |
1124 | * no interesting cards left, so the bus is powered down. | |
1125 | */ | |
1126 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1127 | { |
7ea239d9 | 1128 | unsigned long flags; |
7ccd266e | 1129 | |
7ea239d9 | 1130 | BUG_ON(!host); |
7ccd266e | 1131 | |
d84075c8 PO |
1132 | WARN_ON(!host->claimed); |
1133 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1134 | |
7ea239d9 | 1135 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1136 | |
7ea239d9 | 1137 | host->bus_dead = 1; |
7ccd266e | 1138 | |
7ea239d9 | 1139 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1140 | |
7ea239d9 | 1141 | mmc_power_off(host); |
1da177e4 | 1142 | |
7ea239d9 | 1143 | mmc_bus_put(host); |
1da177e4 LT |
1144 | } |
1145 | ||
1da177e4 LT |
1146 | /** |
1147 | * mmc_detect_change - process change of state on a MMC socket | |
1148 | * @host: host which changed state. | |
8dc00335 | 1149 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1150 | * |
67a61c48 PO |
1151 | * MMC drivers should call this when they detect a card has been |
1152 | * inserted or removed. The MMC layer will confirm that any | |
1153 | * present card is still functional, and initialize any newly | |
1154 | * inserted. | |
1da177e4 | 1155 | */ |
8dc00335 | 1156 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1157 | { |
3b91e550 | 1158 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1159 | unsigned long flags; |
01f41ec7 | 1160 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1161 | WARN_ON(host->removed); |
01f41ec7 | 1162 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1163 | #endif |
1164 | ||
c4028958 | 1165 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | EXPORT_SYMBOL(mmc_detect_change); | |
1169 | ||
dfe86cba AH |
1170 | void mmc_init_erase(struct mmc_card *card) |
1171 | { | |
1172 | unsigned int sz; | |
1173 | ||
1174 | if (is_power_of_2(card->erase_size)) | |
1175 | card->erase_shift = ffs(card->erase_size) - 1; | |
1176 | else | |
1177 | card->erase_shift = 0; | |
1178 | ||
1179 | /* | |
1180 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1181 | * card. That is not desirable because it can take a long time | |
1182 | * (minutes) potentially delaying more important I/O, and also the | |
1183 | * timeout calculations become increasingly hugely over-estimated. | |
1184 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1185 | * to that size and alignment. | |
1186 | * | |
1187 | * For SD cards that define Allocation Unit size, limit erases to one | |
1188 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1189 | * Erase Size, whether it is switched on or not, limit to that size. | |
1190 | * Otherwise just have a stab at a good value. For modern cards it | |
1191 | * will end up being 4MiB. Note that if the value is too small, it | |
1192 | * can end up taking longer to erase. | |
1193 | */ | |
1194 | if (mmc_card_sd(card) && card->ssr.au) { | |
1195 | card->pref_erase = card->ssr.au; | |
1196 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1197 | } else if (card->ext_csd.hc_erase_size) { | |
1198 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1199 | } else { | |
1200 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1201 | if (sz < 128) | |
1202 | card->pref_erase = 512 * 1024 / 512; | |
1203 | else if (sz < 512) | |
1204 | card->pref_erase = 1024 * 1024 / 512; | |
1205 | else if (sz < 1024) | |
1206 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1207 | else | |
1208 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1209 | if (card->pref_erase < card->erase_size) | |
1210 | card->pref_erase = card->erase_size; | |
1211 | else { | |
1212 | sz = card->pref_erase % card->erase_size; | |
1213 | if (sz) | |
1214 | card->pref_erase += card->erase_size - sz; | |
1215 | } | |
1216 | } | |
1217 | } | |
1218 | ||
eaa02f75 AW |
1219 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1220 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1221 | { |
1222 | unsigned int erase_timeout; | |
1223 | ||
1224 | if (card->ext_csd.erase_group_def & 1) { | |
1225 | /* High Capacity Erase Group Size uses HC timeouts */ | |
1226 | if (arg == MMC_TRIM_ARG) | |
1227 | erase_timeout = card->ext_csd.trim_timeout; | |
1228 | else | |
1229 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1230 | } else { | |
1231 | /* CSD Erase Group Size uses write timeout */ | |
1232 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1233 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1234 | unsigned int timeout_us; | |
1235 | ||
1236 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1237 | if (card->csd.tacc_ns < 1000000) | |
1238 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1239 | else | |
1240 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1241 | ||
1242 | /* | |
1243 | * ios.clock is only a target. The real clock rate might be | |
1244 | * less but not that much less, so fudge it by multiplying by 2. | |
1245 | */ | |
1246 | timeout_clks <<= 1; | |
1247 | timeout_us += (timeout_clks * 1000) / | |
1248 | (card->host->ios.clock / 1000); | |
1249 | ||
1250 | erase_timeout = timeout_us / 1000; | |
1251 | ||
1252 | /* | |
1253 | * Theoretically, the calculation could underflow so round up | |
1254 | * to 1ms in that case. | |
1255 | */ | |
1256 | if (!erase_timeout) | |
1257 | erase_timeout = 1; | |
1258 | } | |
1259 | ||
1260 | /* Multiplier for secure operations */ | |
1261 | if (arg & MMC_SECURE_ARGS) { | |
1262 | if (arg == MMC_SECURE_ERASE_ARG) | |
1263 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1264 | else | |
1265 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1266 | } | |
1267 | ||
1268 | erase_timeout *= qty; | |
1269 | ||
1270 | /* | |
1271 | * Ensure at least a 1 second timeout for SPI as per | |
1272 | * 'mmc_set_data_timeout()' | |
1273 | */ | |
1274 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1275 | erase_timeout = 1000; | |
1276 | ||
eaa02f75 | 1277 | return erase_timeout; |
dfe86cba AH |
1278 | } |
1279 | ||
eaa02f75 AW |
1280 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1281 | unsigned int arg, | |
1282 | unsigned int qty) | |
dfe86cba | 1283 | { |
eaa02f75 AW |
1284 | unsigned int erase_timeout; |
1285 | ||
dfe86cba AH |
1286 | if (card->ssr.erase_timeout) { |
1287 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1288 | erase_timeout = card->ssr.erase_timeout * qty + |
1289 | card->ssr.erase_offset; | |
dfe86cba AH |
1290 | } else { |
1291 | /* | |
1292 | * Erase timeout not specified in SD Status Register (SSR) so | |
1293 | * use 250ms per write block. | |
1294 | */ | |
eaa02f75 | 1295 | erase_timeout = 250 * qty; |
dfe86cba AH |
1296 | } |
1297 | ||
1298 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1299 | if (erase_timeout < 1000) |
1300 | erase_timeout = 1000; | |
1301 | ||
1302 | return erase_timeout; | |
dfe86cba AH |
1303 | } |
1304 | ||
eaa02f75 AW |
1305 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1306 | unsigned int arg, | |
1307 | unsigned int qty) | |
dfe86cba AH |
1308 | { |
1309 | if (mmc_card_sd(card)) | |
eaa02f75 | 1310 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1311 | else |
eaa02f75 | 1312 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1313 | } |
1314 | ||
1315 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1316 | unsigned int to, unsigned int arg) | |
1317 | { | |
1278dba1 | 1318 | struct mmc_command cmd = {0}; |
dfe86cba AH |
1319 | unsigned int qty = 0; |
1320 | int err; | |
1321 | ||
1322 | /* | |
1323 | * qty is used to calculate the erase timeout which depends on how many | |
1324 | * erase groups (or allocation units in SD terminology) are affected. | |
1325 | * We count erasing part of an erase group as one erase group. | |
1326 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1327 | * erase group size is almost certainly also power of 2, but it does not | |
1328 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1329 | * division in that case. SD may not specify an allocation unit size, | |
1330 | * in which case the timeout is based on the number of write blocks. | |
1331 | * | |
1332 | * Note that the timeout for secure trim 2 will only be correct if the | |
1333 | * number of erase groups specified is the same as the total of all | |
1334 | * preceding secure trim 1 commands. Since the power may have been | |
1335 | * lost since the secure trim 1 commands occurred, it is generally | |
1336 | * impossible to calculate the secure trim 2 timeout correctly. | |
1337 | */ | |
1338 | if (card->erase_shift) | |
1339 | qty += ((to >> card->erase_shift) - | |
1340 | (from >> card->erase_shift)) + 1; | |
1341 | else if (mmc_card_sd(card)) | |
1342 | qty += to - from + 1; | |
1343 | else | |
1344 | qty += ((to / card->erase_size) - | |
1345 | (from / card->erase_size)) + 1; | |
1346 | ||
1347 | if (!mmc_card_blockaddr(card)) { | |
1348 | from <<= 9; | |
1349 | to <<= 9; | |
1350 | } | |
1351 | ||
dfe86cba AH |
1352 | if (mmc_card_sd(card)) |
1353 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1354 | else | |
1355 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1356 | cmd.arg = from; | |
1357 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1358 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1359 | if (err) { | |
1360 | printk(KERN_ERR "mmc_erase: group start error %d, " | |
1361 | "status %#x\n", err, cmd.resp[0]); | |
1362 | err = -EINVAL; | |
1363 | goto out; | |
1364 | } | |
1365 | ||
1366 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1367 | if (mmc_card_sd(card)) | |
1368 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1369 | else | |
1370 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1371 | cmd.arg = to; | |
1372 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1373 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1374 | if (err) { | |
1375 | printk(KERN_ERR "mmc_erase: group end error %d, status %#x\n", | |
1376 | err, cmd.resp[0]); | |
1377 | err = -EINVAL; | |
1378 | goto out; | |
1379 | } | |
1380 | ||
1381 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1382 | cmd.opcode = MMC_ERASE; | |
1383 | cmd.arg = arg; | |
1384 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1385 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1386 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1387 | if (err) { | |
1388 | printk(KERN_ERR "mmc_erase: erase error %d, status %#x\n", | |
1389 | err, cmd.resp[0]); | |
1390 | err = -EIO; | |
1391 | goto out; | |
1392 | } | |
1393 | ||
1394 | if (mmc_host_is_spi(card->host)) | |
1395 | goto out; | |
1396 | ||
1397 | do { | |
1398 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1399 | cmd.opcode = MMC_SEND_STATUS; | |
1400 | cmd.arg = card->rca << 16; | |
1401 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1402 | /* Do not retry else we can't see errors */ | |
1403 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1404 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
1405 | printk(KERN_ERR "error %d requesting status %#x\n", | |
1406 | err, cmd.resp[0]); | |
1407 | err = -EIO; | |
1408 | goto out; | |
1409 | } | |
1410 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
1411 | R1_CURRENT_STATE(cmd.resp[0]) == 7); | |
1412 | out: | |
1413 | return err; | |
1414 | } | |
1415 | ||
1416 | /** | |
1417 | * mmc_erase - erase sectors. | |
1418 | * @card: card to erase | |
1419 | * @from: first sector to erase | |
1420 | * @nr: number of sectors to erase | |
1421 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1422 | * | |
1423 | * Caller must claim host before calling this function. | |
1424 | */ | |
1425 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1426 | unsigned int arg) | |
1427 | { | |
1428 | unsigned int rem, to = from + nr; | |
1429 | ||
1430 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1431 | !(card->csd.cmdclass & CCC_ERASE)) | |
1432 | return -EOPNOTSUPP; | |
1433 | ||
1434 | if (!card->erase_size) | |
1435 | return -EOPNOTSUPP; | |
1436 | ||
1437 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1438 | return -EOPNOTSUPP; | |
1439 | ||
1440 | if ((arg & MMC_SECURE_ARGS) && | |
1441 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1442 | return -EOPNOTSUPP; | |
1443 | ||
1444 | if ((arg & MMC_TRIM_ARGS) && | |
1445 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1446 | return -EOPNOTSUPP; | |
1447 | ||
1448 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1449 | if (from % card->erase_size || nr % card->erase_size) | |
1450 | return -EINVAL; | |
1451 | } | |
1452 | ||
1453 | if (arg == MMC_ERASE_ARG) { | |
1454 | rem = from % card->erase_size; | |
1455 | if (rem) { | |
1456 | rem = card->erase_size - rem; | |
1457 | from += rem; | |
1458 | if (nr > rem) | |
1459 | nr -= rem; | |
1460 | else | |
1461 | return 0; | |
1462 | } | |
1463 | rem = nr % card->erase_size; | |
1464 | if (rem) | |
1465 | nr -= rem; | |
1466 | } | |
1467 | ||
1468 | if (nr == 0) | |
1469 | return 0; | |
1470 | ||
1471 | to = from + nr; | |
1472 | ||
1473 | if (to <= from) | |
1474 | return -EINVAL; | |
1475 | ||
1476 | /* 'from' and 'to' are inclusive */ | |
1477 | to -= 1; | |
1478 | ||
1479 | return mmc_do_erase(card, from, to, arg); | |
1480 | } | |
1481 | EXPORT_SYMBOL(mmc_erase); | |
1482 | ||
1483 | int mmc_can_erase(struct mmc_card *card) | |
1484 | { | |
1485 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1486 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1487 | return 1; | |
1488 | return 0; | |
1489 | } | |
1490 | EXPORT_SYMBOL(mmc_can_erase); | |
1491 | ||
1492 | int mmc_can_trim(struct mmc_card *card) | |
1493 | { | |
1494 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
1495 | return 1; | |
1496 | return 0; | |
1497 | } | |
1498 | EXPORT_SYMBOL(mmc_can_trim); | |
1499 | ||
1500 | int mmc_can_secure_erase_trim(struct mmc_card *card) | |
1501 | { | |
1502 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
1503 | return 1; | |
1504 | return 0; | |
1505 | } | |
1506 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
1507 | ||
1508 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
1509 | unsigned int nr) | |
1510 | { | |
1511 | if (!card->erase_size) | |
1512 | return 0; | |
1513 | if (from % card->erase_size || nr % card->erase_size) | |
1514 | return 0; | |
1515 | return 1; | |
1516 | } | |
1517 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 1518 | |
0f8d8ea6 AH |
1519 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
1520 | { | |
1278dba1 | 1521 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
1522 | |
1523 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
1524 | return 0; | |
1525 | ||
0f8d8ea6 AH |
1526 | cmd.opcode = MMC_SET_BLOCKLEN; |
1527 | cmd.arg = blocklen; | |
1528 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1529 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
1530 | } | |
1531 | EXPORT_SYMBOL(mmc_set_blocklen); | |
1532 | ||
807e8e40 AR |
1533 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
1534 | { | |
1535 | host->f_init = freq; | |
1536 | ||
1537 | #ifdef CONFIG_MMC_DEBUG | |
1538 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
1539 | mmc_hostname(host), __func__, host->f_init); | |
1540 | #endif | |
1541 | mmc_power_up(host); | |
2f94e55a PR |
1542 | |
1543 | /* | |
1544 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
1545 | * if the card is being re-initialized, just send it. CMD52 | |
1546 | * should be ignored by SD/eMMC cards. | |
1547 | */ | |
807e8e40 AR |
1548 | sdio_reset(host); |
1549 | mmc_go_idle(host); | |
1550 | ||
1551 | mmc_send_if_cond(host, host->ocr_avail); | |
1552 | ||
1553 | /* Order's important: probe SDIO, then SD, then MMC */ | |
1554 | if (!mmc_attach_sdio(host)) | |
1555 | return 0; | |
1556 | if (!mmc_attach_sd(host)) | |
1557 | return 0; | |
1558 | if (!mmc_attach_mmc(host)) | |
1559 | return 0; | |
1560 | ||
1561 | mmc_power_off(host); | |
1562 | return -EIO; | |
1563 | } | |
1564 | ||
b93931a6 | 1565 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 1566 | { |
807e8e40 | 1567 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
c4028958 DH |
1568 | struct mmc_host *host = |
1569 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 1570 | int i; |
4c2ef25f | 1571 | |
807e8e40 | 1572 | if (host->rescan_disable) |
4c2ef25f | 1573 | return; |
1da177e4 | 1574 | |
7ea239d9 | 1575 | mmc_bus_get(host); |
b855885e | 1576 | |
30201e7f OBC |
1577 | /* |
1578 | * if there is a _removable_ card registered, check whether it is | |
1579 | * still present | |
1580 | */ | |
1581 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 1582 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
1583 | host->bus_ops->detect(host); |
1584 | ||
c5841798 CB |
1585 | /* |
1586 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
1587 | * the card is no longer present. | |
1588 | */ | |
94d89efb | 1589 | mmc_bus_put(host); |
94d89efb JS |
1590 | mmc_bus_get(host); |
1591 | ||
1592 | /* if there still is a card present, stop here */ | |
1593 | if (host->bus_ops != NULL) { | |
7ea239d9 | 1594 | mmc_bus_put(host); |
94d89efb JS |
1595 | goto out; |
1596 | } | |
1da177e4 | 1597 | |
94d89efb JS |
1598 | /* |
1599 | * Only we can add a new handler, so it's safe to | |
1600 | * release the lock here. | |
1601 | */ | |
1602 | mmc_bus_put(host); | |
1da177e4 | 1603 | |
94d89efb JS |
1604 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
1605 | goto out; | |
1da177e4 | 1606 | |
807e8e40 | 1607 | mmc_claim_host(host); |
88ae8b86 | 1608 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
1609 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
1610 | break; | |
1611 | if (freqs[i] < host->f_min) | |
1612 | break; | |
88ae8b86 | 1613 | } |
807e8e40 AR |
1614 | mmc_release_host(host); |
1615 | ||
1616 | out: | |
28f52482 AV |
1617 | if (host->caps & MMC_CAP_NEEDS_POLL) |
1618 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
1619 | } |
1620 | ||
b93931a6 | 1621 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 1622 | { |
b93931a6 PO |
1623 | mmc_power_off(host); |
1624 | mmc_detect_change(host, 0); | |
1da177e4 LT |
1625 | } |
1626 | ||
b93931a6 | 1627 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 1628 | { |
3b91e550 | 1629 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
1630 | unsigned long flags; |
1631 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 1632 | host->removed = 1; |
1efd48b3 | 1633 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1634 | #endif |
1635 | ||
8ea926b2 AH |
1636 | if (host->caps & MMC_CAP_DISABLE) |
1637 | cancel_delayed_work(&host->disable); | |
d9bcbf34 | 1638 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
1639 | mmc_flush_scheduled_work(); |
1640 | ||
da68c4eb NP |
1641 | /* clear pm flags now and let card drivers set them as needed */ |
1642 | host->pm_flags = 0; | |
1643 | ||
7ea239d9 PO |
1644 | mmc_bus_get(host); |
1645 | if (host->bus_ops && !host->bus_dead) { | |
1646 | if (host->bus_ops->remove) | |
1647 | host->bus_ops->remove(host); | |
1648 | ||
1649 | mmc_claim_host(host); | |
1650 | mmc_detach_bus(host); | |
1651 | mmc_release_host(host); | |
53509f0f DK |
1652 | mmc_bus_put(host); |
1653 | return; | |
1da177e4 | 1654 | } |
7ea239d9 PO |
1655 | mmc_bus_put(host); |
1656 | ||
1657 | BUG_ON(host->card); | |
1da177e4 LT |
1658 | |
1659 | mmc_power_off(host); | |
1660 | } | |
1661 | ||
12ae637f | 1662 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 1663 | { |
12ae637f OBC |
1664 | int ret = 0; |
1665 | ||
eae1aeee AH |
1666 | mmc_bus_get(host); |
1667 | ||
1668 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1669 | mmc_bus_put(host); | |
12ae637f | 1670 | return -EINVAL; |
eae1aeee AH |
1671 | } |
1672 | ||
1673 | if (host->bus_ops->power_save) | |
12ae637f | 1674 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
1675 | |
1676 | mmc_bus_put(host); | |
1677 | ||
1678 | mmc_power_off(host); | |
12ae637f OBC |
1679 | |
1680 | return ret; | |
eae1aeee AH |
1681 | } |
1682 | EXPORT_SYMBOL(mmc_power_save_host); | |
1683 | ||
12ae637f | 1684 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 1685 | { |
12ae637f OBC |
1686 | int ret; |
1687 | ||
eae1aeee AH |
1688 | mmc_bus_get(host); |
1689 | ||
1690 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1691 | mmc_bus_put(host); | |
12ae637f | 1692 | return -EINVAL; |
eae1aeee AH |
1693 | } |
1694 | ||
1695 | mmc_power_up(host); | |
12ae637f | 1696 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
1697 | |
1698 | mmc_bus_put(host); | |
12ae637f OBC |
1699 | |
1700 | return ret; | |
eae1aeee AH |
1701 | } |
1702 | EXPORT_SYMBOL(mmc_power_restore_host); | |
1703 | ||
b1ebe384 JL |
1704 | int mmc_card_awake(struct mmc_host *host) |
1705 | { | |
1706 | int err = -ENOSYS; | |
1707 | ||
1708 | mmc_bus_get(host); | |
1709 | ||
1710 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1711 | err = host->bus_ops->awake(host); | |
1712 | ||
1713 | mmc_bus_put(host); | |
1714 | ||
1715 | return err; | |
1716 | } | |
1717 | EXPORT_SYMBOL(mmc_card_awake); | |
1718 | ||
1719 | int mmc_card_sleep(struct mmc_host *host) | |
1720 | { | |
1721 | int err = -ENOSYS; | |
1722 | ||
1723 | mmc_bus_get(host); | |
1724 | ||
1725 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1726 | err = host->bus_ops->sleep(host); | |
1727 | ||
1728 | mmc_bus_put(host); | |
1729 | ||
1730 | return err; | |
1731 | } | |
1732 | EXPORT_SYMBOL(mmc_card_sleep); | |
1733 | ||
1734 | int mmc_card_can_sleep(struct mmc_host *host) | |
1735 | { | |
1736 | struct mmc_card *card = host->card; | |
1737 | ||
1738 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
1739 | return 1; | |
1740 | return 0; | |
1741 | } | |
1742 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
1743 | ||
1da177e4 LT |
1744 | #ifdef CONFIG_PM |
1745 | ||
1746 | /** | |
1747 | * mmc_suspend_host - suspend a host | |
1748 | * @host: mmc host | |
1da177e4 | 1749 | */ |
1a13f8fa | 1750 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 1751 | { |
95cdfb72 NP |
1752 | int err = 0; |
1753 | ||
8ea926b2 AH |
1754 | if (host->caps & MMC_CAP_DISABLE) |
1755 | cancel_delayed_work(&host->disable); | |
7de427d0 | 1756 | cancel_delayed_work(&host->detect); |
b5af25be PO |
1757 | mmc_flush_scheduled_work(); |
1758 | ||
7ea239d9 PO |
1759 | mmc_bus_get(host); |
1760 | if (host->bus_ops && !host->bus_dead) { | |
6abaa0c9 | 1761 | if (host->bus_ops->suspend) |
95cdfb72 | 1762 | err = host->bus_ops->suspend(host); |
1c8cf9c9 OBC |
1763 | if (err == -ENOSYS || !host->bus_ops->resume) { |
1764 | /* | |
1765 | * We simply "remove" the card in this case. | |
1766 | * It will be redetected on resume. | |
1767 | */ | |
1768 | if (host->bus_ops->remove) | |
1769 | host->bus_ops->remove(host); | |
1770 | mmc_claim_host(host); | |
1771 | mmc_detach_bus(host); | |
1772 | mmc_release_host(host); | |
1773 | host->pm_flags = 0; | |
1774 | err = 0; | |
1775 | } | |
b5af25be | 1776 | } |
7ea239d9 PO |
1777 | mmc_bus_put(host); |
1778 | ||
a5e9425d | 1779 | if (!err && !mmc_card_keep_power(host)) |
95cdfb72 | 1780 | mmc_power_off(host); |
1da177e4 | 1781 | |
95cdfb72 | 1782 | return err; |
1da177e4 LT |
1783 | } |
1784 | ||
1785 | EXPORT_SYMBOL(mmc_suspend_host); | |
1786 | ||
1787 | /** | |
1788 | * mmc_resume_host - resume a previously suspended host | |
1789 | * @host: mmc host | |
1790 | */ | |
1791 | int mmc_resume_host(struct mmc_host *host) | |
1792 | { | |
95cdfb72 NP |
1793 | int err = 0; |
1794 | ||
6abaa0c9 PO |
1795 | mmc_bus_get(host); |
1796 | if (host->bus_ops && !host->bus_dead) { | |
a5e9425d | 1797 | if (!mmc_card_keep_power(host)) { |
da68c4eb NP |
1798 | mmc_power_up(host); |
1799 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
1800 | /* |
1801 | * Tell runtime PM core we just powered up the card, | |
1802 | * since it still believes the card is powered off. | |
1803 | * Note that currently runtime PM is only enabled | |
1804 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
1805 | */ | |
1806 | if (mmc_card_sdio(host->card) && | |
1807 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
1808 | pm_runtime_disable(&host->card->dev); | |
1809 | pm_runtime_set_active(&host->card->dev); | |
1810 | pm_runtime_enable(&host->card->dev); | |
1811 | } | |
da68c4eb | 1812 | } |
6abaa0c9 | 1813 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
1814 | err = host->bus_ops->resume(host); |
1815 | if (err) { | |
1816 | printk(KERN_WARNING "%s: error %d during resume " | |
1817 | "(card was removed?)\n", | |
1818 | mmc_hostname(host), err); | |
95cdfb72 NP |
1819 | err = 0; |
1820 | } | |
6abaa0c9 | 1821 | } |
a8e6df73 | 1822 | host->pm_flags &= ~MMC_PM_KEEP_POWER; |
6abaa0c9 PO |
1823 | mmc_bus_put(host); |
1824 | ||
95cdfb72 | 1825 | return err; |
1da177e4 | 1826 | } |
1da177e4 LT |
1827 | EXPORT_SYMBOL(mmc_resume_host); |
1828 | ||
4c2ef25f ML |
1829 | /* Do the card removal on suspend if card is assumed removeable |
1830 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
1831 | to sync the card. | |
1832 | */ | |
1833 | int mmc_pm_notify(struct notifier_block *notify_block, | |
1834 | unsigned long mode, void *unused) | |
1835 | { | |
1836 | struct mmc_host *host = container_of( | |
1837 | notify_block, struct mmc_host, pm_notify); | |
1838 | unsigned long flags; | |
1839 | ||
1840 | ||
1841 | switch (mode) { | |
1842 | case PM_HIBERNATION_PREPARE: | |
1843 | case PM_SUSPEND_PREPARE: | |
1844 | ||
1845 | spin_lock_irqsave(&host->lock, flags); | |
1846 | host->rescan_disable = 1; | |
1847 | spin_unlock_irqrestore(&host->lock, flags); | |
1848 | cancel_delayed_work_sync(&host->detect); | |
1849 | ||
1850 | if (!host->bus_ops || host->bus_ops->suspend) | |
1851 | break; | |
1852 | ||
1853 | mmc_claim_host(host); | |
1854 | ||
1855 | if (host->bus_ops->remove) | |
1856 | host->bus_ops->remove(host); | |
1857 | ||
1858 | mmc_detach_bus(host); | |
1859 | mmc_release_host(host); | |
1860 | host->pm_flags = 0; | |
1861 | break; | |
1862 | ||
1863 | case PM_POST_SUSPEND: | |
1864 | case PM_POST_HIBERNATION: | |
274476f8 | 1865 | case PM_POST_RESTORE: |
4c2ef25f ML |
1866 | |
1867 | spin_lock_irqsave(&host->lock, flags); | |
1868 | host->rescan_disable = 0; | |
1869 | spin_unlock_irqrestore(&host->lock, flags); | |
1870 | mmc_detect_change(host, 0); | |
1871 | ||
1872 | } | |
1873 | ||
1874 | return 0; | |
1875 | } | |
1da177e4 LT |
1876 | #endif |
1877 | ||
ffce2e7e PO |
1878 | static int __init mmc_init(void) |
1879 | { | |
1880 | int ret; | |
1881 | ||
0d9ee5b2 | 1882 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
1883 | if (!workqueue) |
1884 | return -ENOMEM; | |
1885 | ||
1886 | ret = mmc_register_bus(); | |
e29a7d73 PO |
1887 | if (ret) |
1888 | goto destroy_workqueue; | |
1889 | ||
1890 | ret = mmc_register_host_class(); | |
1891 | if (ret) | |
1892 | goto unregister_bus; | |
1893 | ||
1894 | ret = sdio_register_bus(); | |
1895 | if (ret) | |
1896 | goto unregister_host_class; | |
1897 | ||
1898 | return 0; | |
1899 | ||
1900 | unregister_host_class: | |
1901 | mmc_unregister_host_class(); | |
1902 | unregister_bus: | |
1903 | mmc_unregister_bus(); | |
1904 | destroy_workqueue: | |
1905 | destroy_workqueue(workqueue); | |
1906 | ||
ffce2e7e PO |
1907 | return ret; |
1908 | } | |
1909 | ||
1910 | static void __exit mmc_exit(void) | |
1911 | { | |
e29a7d73 | 1912 | sdio_unregister_bus(); |
ffce2e7e PO |
1913 | mmc_unregister_host_class(); |
1914 | mmc_unregister_bus(); | |
1915 | destroy_workqueue(workqueue); | |
1916 | } | |
1917 | ||
26074962 | 1918 | subsys_initcall(mmc_init); |
ffce2e7e PO |
1919 | module_exit(mmc_exit); |
1920 | ||
1da177e4 | 1921 | MODULE_LICENSE("GPL"); |