Commit | Line | Data |
---|---|---|
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> |
35eb6db1 | 26 | #include <linux/suspend.h> |
1b676f70 PF |
27 | #include <linux/fault-inject.h> |
28 | #include <linux/random.h> | |
1da177e4 LT |
29 | |
30 | #include <linux/mmc/card.h> | |
31 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
32 | #include <linux/mmc/mmc.h> |
33 | #include <linux/mmc/sd.h> | |
1da177e4 | 34 | |
aaac1b47 | 35 | #include "core.h" |
ffce2e7e PO |
36 | #include "bus.h" |
37 | #include "host.h" | |
e29a7d73 | 38 | #include "sdio_bus.h" |
da7fbe58 PO |
39 | |
40 | #include "mmc_ops.h" | |
41 | #include "sd_ops.h" | |
5c4e6f13 | 42 | #include "sdio_ops.h" |
1da177e4 | 43 | |
ffce2e7e PO |
44 | static struct workqueue_struct *workqueue; |
45 | ||
af517150 DB |
46 | /* |
47 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
48 | * performance cost, and for other reasons may not always be desired. | |
49 | * So we allow it it to be disabled. | |
50 | */ | |
51 | int use_spi_crc = 1; | |
52 | module_param(use_spi_crc, bool, 0); | |
53 | ||
bd68e083 BH |
54 | /* |
55 | * We normally treat cards as removed during suspend if they are not | |
56 | * known to be on a non-removable bus, to avoid the risk of writing | |
57 | * back data to a different card after resume. Allow this to be | |
58 | * overridden if necessary. | |
59 | */ | |
60 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
61 | int mmc_assume_removable; | |
62 | #else | |
63 | int mmc_assume_removable = 1; | |
64 | #endif | |
71d7d3d1 | 65 | EXPORT_SYMBOL(mmc_assume_removable); |
bd68e083 BH |
66 | module_param_named(removable, mmc_assume_removable, bool, 0644); |
67 | MODULE_PARM_DESC( | |
68 | removable, | |
69 | "MMC/SD cards are removable and may be removed during suspend"); | |
70 | ||
ffce2e7e PO |
71 | /* |
72 | * Internal function. Schedule delayed work in the MMC work queue. | |
73 | */ | |
74 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
75 | unsigned long delay) | |
76 | { | |
77 | return queue_delayed_work(workqueue, work, delay); | |
78 | } | |
79 | ||
80 | /* | |
81 | * Internal function. Flush all scheduled work from the MMC work queue. | |
82 | */ | |
83 | static void mmc_flush_scheduled_work(void) | |
84 | { | |
85 | flush_workqueue(workqueue); | |
86 | } | |
87 | ||
1b676f70 PF |
88 | #ifdef CONFIG_FAIL_MMC_REQUEST |
89 | ||
90 | /* | |
91 | * Internal function. Inject random data errors. | |
92 | * If mmc_data is NULL no errors are injected. | |
93 | */ | |
94 | static void mmc_should_fail_request(struct mmc_host *host, | |
95 | struct mmc_request *mrq) | |
96 | { | |
97 | struct mmc_command *cmd = mrq->cmd; | |
98 | struct mmc_data *data = mrq->data; | |
99 | static const int data_errors[] = { | |
100 | -ETIMEDOUT, | |
101 | -EILSEQ, | |
102 | -EIO, | |
103 | }; | |
104 | ||
105 | if (!data) | |
106 | return; | |
107 | ||
108 | if (cmd->error || data->error || | |
109 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
110 | return; | |
111 | ||
112 | data->error = data_errors[random32() % ARRAY_SIZE(data_errors)]; | |
113 | data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9; | |
114 | } | |
115 | ||
116 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
117 | ||
118 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
119 | struct mmc_request *mrq) | |
120 | { | |
121 | } | |
122 | ||
123 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
124 | ||
1da177e4 | 125 | /** |
fe10c6ab RK |
126 | * mmc_request_done - finish processing an MMC request |
127 | * @host: MMC host which completed request | |
128 | * @mrq: MMC request which request | |
1da177e4 LT |
129 | * |
130 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 131 | * their processing of a request. |
1da177e4 LT |
132 | */ |
133 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
134 | { | |
135 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
136 | int err = cmd->error; |
137 | ||
af517150 DB |
138 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
139 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
140 | cmd->retries = 0; | |
141 | } | |
142 | ||
1da177e4 | 143 | if (err && cmd->retries) { |
e4d21708 PO |
144 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", |
145 | mmc_hostname(host), cmd->opcode, err); | |
146 | ||
1da177e4 LT |
147 | cmd->retries--; |
148 | cmd->error = 0; | |
149 | host->ops->request(host, mrq); | |
e4d21708 | 150 | } else { |
1b676f70 PF |
151 | mmc_should_fail_request(host, mrq); |
152 | ||
af8350c7 PO |
153 | led_trigger_event(host->led, LED_OFF); |
154 | ||
e4d21708 PO |
155 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
156 | mmc_hostname(host), cmd->opcode, err, | |
157 | cmd->resp[0], cmd->resp[1], | |
158 | cmd->resp[2], cmd->resp[3]); | |
159 | ||
160 | if (mrq->data) { | |
161 | pr_debug("%s: %d bytes transferred: %d\n", | |
162 | mmc_hostname(host), | |
163 | mrq->data->bytes_xfered, mrq->data->error); | |
164 | } | |
165 | ||
166 | if (mrq->stop) { | |
167 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
168 | mmc_hostname(host), mrq->stop->opcode, | |
169 | mrq->stop->error, | |
170 | mrq->stop->resp[0], mrq->stop->resp[1], | |
171 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
172 | } | |
173 | ||
174 | if (mrq->done) | |
175 | mrq->done(mrq); | |
04566831 | 176 | |
08c14071 | 177 | mmc_host_clk_release(host); |
1da177e4 LT |
178 | } |
179 | } | |
180 | ||
181 | EXPORT_SYMBOL(mmc_request_done); | |
182 | ||
39361851 | 183 | static void |
1da177e4 LT |
184 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
185 | { | |
976d9276 PO |
186 | #ifdef CONFIG_MMC_DEBUG |
187 | unsigned int i, sz; | |
a84756c5 | 188 | struct scatterlist *sg; |
976d9276 PO |
189 | #endif |
190 | ||
920e70c5 RK |
191 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
192 | mmc_hostname(host), mrq->cmd->opcode, | |
193 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 194 | |
e4d21708 PO |
195 | if (mrq->data) { |
196 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
197 | "tsac %d ms nsac %d\n", | |
198 | mmc_hostname(host), mrq->data->blksz, | |
199 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 200 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
201 | mrq->data->timeout_clks); |
202 | } | |
203 | ||
204 | if (mrq->stop) { | |
205 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
206 | mmc_hostname(host), mrq->stop->opcode, | |
207 | mrq->stop->arg, mrq->stop->flags); | |
208 | } | |
209 | ||
f22ee4ed | 210 | WARN_ON(!host->claimed); |
1da177e4 LT |
211 | |
212 | mrq->cmd->error = 0; | |
213 | mrq->cmd->mrq = mrq; | |
214 | if (mrq->data) { | |
fe4a3c7a | 215 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
216 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
217 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
218 | host->max_req_size); | |
fe4a3c7a | 219 | |
976d9276 PO |
220 | #ifdef CONFIG_MMC_DEBUG |
221 | sz = 0; | |
a84756c5 PO |
222 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
223 | sz += sg->length; | |
976d9276 PO |
224 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
225 | #endif | |
226 | ||
1da177e4 LT |
227 | mrq->cmd->data = mrq->data; |
228 | mrq->data->error = 0; | |
229 | mrq->data->mrq = mrq; | |
230 | if (mrq->stop) { | |
231 | mrq->data->stop = mrq->stop; | |
232 | mrq->stop->error = 0; | |
233 | mrq->stop->mrq = mrq; | |
234 | } | |
235 | } | |
08c14071 | 236 | mmc_host_clk_hold(host); |
66c036e0 | 237 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
238 | host->ops->request(host, mrq); |
239 | } | |
240 | ||
1da177e4 LT |
241 | static void mmc_wait_done(struct mmc_request *mrq) |
242 | { | |
aa8b683a PF |
243 | complete(&mrq->completion); |
244 | } | |
245 | ||
246 | static void __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) | |
247 | { | |
248 | init_completion(&mrq->completion); | |
249 | mrq->done = mmc_wait_done; | |
250 | mmc_start_request(host, mrq); | |
251 | } | |
252 | ||
253 | static void mmc_wait_for_req_done(struct mmc_host *host, | |
254 | struct mmc_request *mrq) | |
255 | { | |
256 | wait_for_completion(&mrq->completion); | |
257 | } | |
258 | ||
259 | /** | |
260 | * mmc_pre_req - Prepare for a new request | |
261 | * @host: MMC host to prepare command | |
262 | * @mrq: MMC request to prepare for | |
263 | * @is_first_req: true if there is no previous started request | |
264 | * that may run in parellel to this call, otherwise false | |
265 | * | |
266 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
267 | * host prepare for the new request. Preparation of a request may be | |
268 | * performed while another request is running on the host. | |
269 | */ | |
270 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
271 | bool is_first_req) | |
272 | { | |
273 | if (host->ops->pre_req) | |
274 | host->ops->pre_req(host, mrq, is_first_req); | |
275 | } | |
276 | ||
277 | /** | |
278 | * mmc_post_req - Post process a completed request | |
279 | * @host: MMC host to post process command | |
280 | * @mrq: MMC request to post process for | |
281 | * @err: Error, if non zero, clean up any resources made in pre_req | |
282 | * | |
283 | * Let the host post process a completed request. Post processing of | |
284 | * a request may be performed while another reuqest is running. | |
285 | */ | |
286 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
287 | int err) | |
288 | { | |
289 | if (host->ops->post_req) | |
290 | host->ops->post_req(host, mrq, err); | |
1da177e4 LT |
291 | } |
292 | ||
aa8b683a PF |
293 | /** |
294 | * mmc_start_req - start a non-blocking request | |
295 | * @host: MMC host to start command | |
296 | * @areq: async request to start | |
297 | * @error: out parameter returns 0 for success, otherwise non zero | |
298 | * | |
299 | * Start a new MMC custom command request for a host. | |
300 | * If there is on ongoing async request wait for completion | |
301 | * of that request and start the new one and return. | |
302 | * Does not wait for the new request to complete. | |
303 | * | |
304 | * Returns the completed request, NULL in case of none completed. | |
305 | * Wait for the an ongoing request (previoulsy started) to complete and | |
306 | * return the completed request. If there is no ongoing request, NULL | |
307 | * is returned without waiting. NULL is not an error condition. | |
308 | */ | |
309 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
310 | struct mmc_async_req *areq, int *error) | |
311 | { | |
312 | int err = 0; | |
313 | struct mmc_async_req *data = host->areq; | |
314 | ||
315 | /* Prepare a new request */ | |
316 | if (areq) | |
317 | mmc_pre_req(host, areq->mrq, !host->areq); | |
318 | ||
319 | if (host->areq) { | |
320 | mmc_wait_for_req_done(host, host->areq->mrq); | |
321 | err = host->areq->err_check(host->card, host->areq); | |
322 | if (err) { | |
7c8a2829 | 323 | /* post process the completed failed request */ |
aa8b683a PF |
324 | mmc_post_req(host, host->areq->mrq, 0); |
325 | if (areq) | |
7c8a2829 PF |
326 | /* |
327 | * Cancel the new prepared request, because | |
328 | * it can't run until the failed | |
329 | * request has been properly handled. | |
330 | */ | |
aa8b683a PF |
331 | mmc_post_req(host, areq->mrq, -EINVAL); |
332 | ||
333 | host->areq = NULL; | |
334 | goto out; | |
335 | } | |
336 | } | |
337 | ||
338 | if (areq) | |
339 | __mmc_start_req(host, areq->mrq); | |
340 | ||
341 | if (host->areq) | |
342 | mmc_post_req(host, host->areq->mrq, 0); | |
343 | ||
344 | host->areq = areq; | |
345 | out: | |
346 | if (error) | |
347 | *error = err; | |
348 | return data; | |
349 | } | |
350 | EXPORT_SYMBOL(mmc_start_req); | |
351 | ||
67a61c48 PO |
352 | /** |
353 | * mmc_wait_for_req - start a request and wait for completion | |
354 | * @host: MMC host to start command | |
355 | * @mrq: MMC request to start | |
356 | * | |
357 | * Start a new MMC custom command request for a host, and wait | |
358 | * for the command to complete. Does not attempt to parse the | |
359 | * response. | |
360 | */ | |
361 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 362 | { |
aa8b683a PF |
363 | __mmc_start_req(host, mrq); |
364 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 365 | } |
1da177e4 LT |
366 | EXPORT_SYMBOL(mmc_wait_for_req); |
367 | ||
368 | /** | |
369 | * mmc_wait_for_cmd - start a command and wait for completion | |
370 | * @host: MMC host to start command | |
371 | * @cmd: MMC command to start | |
372 | * @retries: maximum number of retries | |
373 | * | |
374 | * Start a new MMC command for a host, and wait for the command | |
375 | * to complete. Return any error that occurred while the command | |
376 | * was executing. Do not attempt to parse the response. | |
377 | */ | |
378 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
379 | { | |
ad5fd972 | 380 | struct mmc_request mrq = {NULL}; |
1da177e4 | 381 | |
d84075c8 | 382 | WARN_ON(!host->claimed); |
1da177e4 | 383 | |
1da177e4 LT |
384 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
385 | cmd->retries = retries; | |
386 | ||
387 | mrq.cmd = cmd; | |
388 | cmd->data = NULL; | |
389 | ||
390 | mmc_wait_for_req(host, &mrq); | |
391 | ||
392 | return cmd->error; | |
393 | } | |
394 | ||
395 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
396 | ||
d773d725 RK |
397 | /** |
398 | * mmc_set_data_timeout - set the timeout for a data command | |
399 | * @data: data phase for command | |
400 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
401 | * |
402 | * Computes the data timeout parameters according to the | |
403 | * correct algorithm given the card type. | |
d773d725 | 404 | */ |
b146d26a | 405 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
406 | { |
407 | unsigned int mult; | |
408 | ||
e6f918bf PO |
409 | /* |
410 | * SDIO cards only define an upper 1 s limit on access. | |
411 | */ | |
412 | if (mmc_card_sdio(card)) { | |
413 | data->timeout_ns = 1000000000; | |
414 | data->timeout_clks = 0; | |
415 | return; | |
416 | } | |
417 | ||
d773d725 RK |
418 | /* |
419 | * SD cards use a 100 multiplier rather than 10 | |
420 | */ | |
421 | mult = mmc_card_sd(card) ? 100 : 10; | |
422 | ||
423 | /* | |
424 | * Scale up the multiplier (and therefore the timeout) by | |
425 | * the r2w factor for writes. | |
426 | */ | |
b146d26a | 427 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
428 | mult <<= card->csd.r2w_factor; |
429 | ||
430 | data->timeout_ns = card->csd.tacc_ns * mult; | |
431 | data->timeout_clks = card->csd.tacc_clks * mult; | |
432 | ||
433 | /* | |
434 | * SD cards also have an upper limit on the timeout. | |
435 | */ | |
436 | if (mmc_card_sd(card)) { | |
437 | unsigned int timeout_us, limit_us; | |
438 | ||
439 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
440 | if (mmc_host_clk_rate(card->host)) |
441 | timeout_us += data->timeout_clks * 1000 / | |
442 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 443 | |
b146d26a | 444 | if (data->flags & MMC_DATA_WRITE) |
493890e7 PO |
445 | /* |
446 | * The limit is really 250 ms, but that is | |
447 | * insufficient for some crappy cards. | |
448 | */ | |
449 | limit_us = 300000; | |
d773d725 RK |
450 | else |
451 | limit_us = 100000; | |
452 | ||
fba68bd2 PL |
453 | /* |
454 | * SDHC cards always use these fixed values. | |
455 | */ | |
456 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
457 | data->timeout_ns = limit_us * 1000; |
458 | data->timeout_clks = 0; | |
459 | } | |
460 | } | |
c0c88871 WM |
461 | /* |
462 | * Some cards need very high timeouts if driven in SPI mode. | |
463 | * The worst observed timeout was 900ms after writing a | |
464 | * continuous stream of data until the internal logic | |
465 | * overflowed. | |
466 | */ | |
467 | if (mmc_host_is_spi(card->host)) { | |
468 | if (data->flags & MMC_DATA_WRITE) { | |
469 | if (data->timeout_ns < 1000000000) | |
470 | data->timeout_ns = 1000000000; /* 1s */ | |
471 | } else { | |
472 | if (data->timeout_ns < 100000000) | |
473 | data->timeout_ns = 100000000; /* 100ms */ | |
474 | } | |
475 | } | |
d773d725 RK |
476 | } |
477 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
478 | ||
ad3868b2 PO |
479 | /** |
480 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
481 | * @card: the MMC card associated with the data transfer | |
482 | * @sz: original transfer size | |
483 | * | |
484 | * Pads the original data size with a number of extra bytes in | |
485 | * order to avoid controller bugs and/or performance hits | |
486 | * (e.g. some controllers revert to PIO for certain sizes). | |
487 | * | |
488 | * Returns the improved size, which might be unmodified. | |
489 | * | |
490 | * Note that this function is only relevant when issuing a | |
491 | * single scatter gather entry. | |
492 | */ | |
493 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
494 | { | |
495 | /* | |
496 | * FIXME: We don't have a system for the controller to tell | |
497 | * the core about its problems yet, so for now we just 32-bit | |
498 | * align the size. | |
499 | */ | |
500 | sz = ((sz + 3) / 4) * 4; | |
501 | ||
502 | return sz; | |
503 | } | |
504 | EXPORT_SYMBOL(mmc_align_data_size); | |
505 | ||
8ea926b2 AH |
506 | /** |
507 | * mmc_host_enable - enable a host. | |
508 | * @host: mmc host to enable | |
509 | * | |
510 | * Hosts that support power saving can use the 'enable' and 'disable' | |
511 | * methods to exit and enter power saving states. For more information | |
512 | * see comments for struct mmc_host_ops. | |
513 | */ | |
514 | int mmc_host_enable(struct mmc_host *host) | |
515 | { | |
516 | if (!(host->caps & MMC_CAP_DISABLE)) | |
517 | return 0; | |
518 | ||
519 | if (host->en_dis_recurs) | |
520 | return 0; | |
521 | ||
522 | if (host->nesting_cnt++) | |
523 | return 0; | |
524 | ||
525 | cancel_delayed_work_sync(&host->disable); | |
526 | ||
527 | if (host->enabled) | |
528 | return 0; | |
529 | ||
530 | if (host->ops->enable) { | |
531 | int err; | |
532 | ||
533 | host->en_dis_recurs = 1; | |
534 | err = host->ops->enable(host); | |
535 | host->en_dis_recurs = 0; | |
536 | ||
537 | if (err) { | |
538 | pr_debug("%s: enable error %d\n", | |
539 | mmc_hostname(host), err); | |
540 | return err; | |
541 | } | |
542 | } | |
543 | host->enabled = 1; | |
544 | return 0; | |
545 | } | |
546 | EXPORT_SYMBOL(mmc_host_enable); | |
547 | ||
548 | static int mmc_host_do_disable(struct mmc_host *host, int lazy) | |
549 | { | |
550 | if (host->ops->disable) { | |
551 | int err; | |
552 | ||
553 | host->en_dis_recurs = 1; | |
554 | err = host->ops->disable(host, lazy); | |
555 | host->en_dis_recurs = 0; | |
556 | ||
557 | if (err < 0) { | |
558 | pr_debug("%s: disable error %d\n", | |
559 | mmc_hostname(host), err); | |
560 | return err; | |
561 | } | |
562 | if (err > 0) { | |
563 | unsigned long delay = msecs_to_jiffies(err); | |
564 | ||
565 | mmc_schedule_delayed_work(&host->disable, delay); | |
566 | } | |
567 | } | |
568 | host->enabled = 0; | |
569 | return 0; | |
570 | } | |
571 | ||
572 | /** | |
573 | * mmc_host_disable - disable a host. | |
574 | * @host: mmc host to disable | |
575 | * | |
576 | * Hosts that support power saving can use the 'enable' and 'disable' | |
577 | * methods to exit and enter power saving states. For more information | |
578 | * see comments for struct mmc_host_ops. | |
579 | */ | |
580 | int mmc_host_disable(struct mmc_host *host) | |
581 | { | |
582 | int err; | |
583 | ||
584 | if (!(host->caps & MMC_CAP_DISABLE)) | |
585 | return 0; | |
586 | ||
587 | if (host->en_dis_recurs) | |
588 | return 0; | |
589 | ||
590 | if (--host->nesting_cnt) | |
591 | return 0; | |
592 | ||
593 | if (!host->enabled) | |
594 | return 0; | |
595 | ||
596 | err = mmc_host_do_disable(host, 0); | |
597 | return err; | |
598 | } | |
599 | EXPORT_SYMBOL(mmc_host_disable); | |
600 | ||
1da177e4 | 601 | /** |
2342f332 | 602 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 603 | * @host: mmc host to claim |
2342f332 | 604 | * @abort: whether or not the operation should be aborted |
1da177e4 | 605 | * |
2342f332 NP |
606 | * Claim a host for a set of operations. If @abort is non null and |
607 | * dereference a non-zero value then this will return prematurely with | |
608 | * that non-zero value without acquiring the lock. Returns zero | |
609 | * with the lock held otherwise. | |
1da177e4 | 610 | */ |
2342f332 | 611 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
612 | { |
613 | DECLARE_WAITQUEUE(wait, current); | |
614 | unsigned long flags; | |
2342f332 | 615 | int stop; |
1da177e4 | 616 | |
cf795bfb PO |
617 | might_sleep(); |
618 | ||
1da177e4 LT |
619 | add_wait_queue(&host->wq, &wait); |
620 | spin_lock_irqsave(&host->lock, flags); | |
621 | while (1) { | |
622 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 623 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 624 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
625 | break; |
626 | spin_unlock_irqrestore(&host->lock, flags); | |
627 | schedule(); | |
628 | spin_lock_irqsave(&host->lock, flags); | |
629 | } | |
630 | set_current_state(TASK_RUNNING); | |
319a3f14 | 631 | if (!stop) { |
2342f332 | 632 | host->claimed = 1; |
319a3f14 AH |
633 | host->claimer = current; |
634 | host->claim_cnt += 1; | |
635 | } else | |
2342f332 | 636 | wake_up(&host->wq); |
1da177e4 LT |
637 | spin_unlock_irqrestore(&host->lock, flags); |
638 | remove_wait_queue(&host->wq, &wait); | |
8ea926b2 AH |
639 | if (!stop) |
640 | mmc_host_enable(host); | |
2342f332 | 641 | return stop; |
1da177e4 LT |
642 | } |
643 | ||
2342f332 | 644 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 645 | |
319a3f14 AH |
646 | /** |
647 | * mmc_try_claim_host - try exclusively to claim a host | |
648 | * @host: mmc host to claim | |
649 | * | |
650 | * Returns %1 if the host is claimed, %0 otherwise. | |
651 | */ | |
652 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
653 | { |
654 | int claimed_host = 0; | |
655 | unsigned long flags; | |
656 | ||
657 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 658 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 659 | host->claimed = 1; |
319a3f14 AH |
660 | host->claimer = current; |
661 | host->claim_cnt += 1; | |
8ea926b2 AH |
662 | claimed_host = 1; |
663 | } | |
664 | spin_unlock_irqrestore(&host->lock, flags); | |
665 | return claimed_host; | |
666 | } | |
319a3f14 | 667 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 668 | |
ab1efd27 UH |
669 | /** |
670 | * mmc_do_release_host - release a claimed host | |
671 | * @host: mmc host to release | |
672 | * | |
673 | * If you successfully claimed a host, this function will | |
674 | * release it again. | |
675 | */ | |
676 | void mmc_do_release_host(struct mmc_host *host) | |
8ea926b2 AH |
677 | { |
678 | unsigned long flags; | |
679 | ||
680 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 AH |
681 | if (--host->claim_cnt) { |
682 | /* Release for nested claim */ | |
683 | spin_unlock_irqrestore(&host->lock, flags); | |
684 | } else { | |
685 | host->claimed = 0; | |
686 | host->claimer = NULL; | |
687 | spin_unlock_irqrestore(&host->lock, flags); | |
688 | wake_up(&host->wq); | |
689 | } | |
8ea926b2 | 690 | } |
ab1efd27 | 691 | EXPORT_SYMBOL(mmc_do_release_host); |
8ea926b2 AH |
692 | |
693 | void mmc_host_deeper_disable(struct work_struct *work) | |
694 | { | |
695 | struct mmc_host *host = | |
696 | container_of(work, struct mmc_host, disable.work); | |
697 | ||
698 | /* If the host is claimed then we do not want to disable it anymore */ | |
699 | if (!mmc_try_claim_host(host)) | |
700 | return; | |
701 | mmc_host_do_disable(host, 1); | |
702 | mmc_do_release_host(host); | |
703 | } | |
704 | ||
705 | /** | |
706 | * mmc_host_lazy_disable - lazily disable a host. | |
707 | * @host: mmc host to disable | |
708 | * | |
709 | * Hosts that support power saving can use the 'enable' and 'disable' | |
710 | * methods to exit and enter power saving states. For more information | |
711 | * see comments for struct mmc_host_ops. | |
712 | */ | |
713 | int mmc_host_lazy_disable(struct mmc_host *host) | |
714 | { | |
715 | if (!(host->caps & MMC_CAP_DISABLE)) | |
716 | return 0; | |
717 | ||
718 | if (host->en_dis_recurs) | |
719 | return 0; | |
720 | ||
721 | if (--host->nesting_cnt) | |
722 | return 0; | |
723 | ||
724 | if (!host->enabled) | |
725 | return 0; | |
726 | ||
727 | if (host->disable_delay) { | |
728 | mmc_schedule_delayed_work(&host->disable, | |
729 | msecs_to_jiffies(host->disable_delay)); | |
730 | return 0; | |
731 | } else | |
732 | return mmc_host_do_disable(host, 1); | |
733 | } | |
734 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
735 | ||
1da177e4 LT |
736 | /** |
737 | * mmc_release_host - release a host | |
738 | * @host: mmc host to release | |
739 | * | |
740 | * Release a MMC host, allowing others to claim the host | |
741 | * for their operations. | |
742 | */ | |
743 | void mmc_release_host(struct mmc_host *host) | |
744 | { | |
d84075c8 | 745 | WARN_ON(!host->claimed); |
1da177e4 | 746 | |
8ea926b2 | 747 | mmc_host_lazy_disable(host); |
1da177e4 | 748 | |
8ea926b2 | 749 | mmc_do_release_host(host); |
1da177e4 LT |
750 | } |
751 | ||
752 | EXPORT_SYMBOL(mmc_release_host); | |
753 | ||
7ea239d9 PO |
754 | /* |
755 | * Internal function that does the actual ios call to the host driver, | |
756 | * optionally printing some debug output. | |
757 | */ | |
920e70c5 RK |
758 | static inline void mmc_set_ios(struct mmc_host *host) |
759 | { | |
760 | struct mmc_ios *ios = &host->ios; | |
761 | ||
cd9277c0 PO |
762 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
763 | "width %u timing %u\n", | |
920e70c5 RK |
764 | mmc_hostname(host), ios->clock, ios->bus_mode, |
765 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 766 | ios->bus_width, ios->timing); |
fba68bd2 | 767 | |
04566831 LW |
768 | if (ios->clock > 0) |
769 | mmc_set_ungated(host); | |
920e70c5 RK |
770 | host->ops->set_ios(host, ios); |
771 | } | |
772 | ||
7ea239d9 PO |
773 | /* |
774 | * Control chip select pin on a host. | |
775 | */ | |
da7fbe58 | 776 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 777 | { |
778e277c | 778 | mmc_host_clk_hold(host); |
da7fbe58 PO |
779 | host->ios.chip_select = mode; |
780 | mmc_set_ios(host); | |
778e277c | 781 | mmc_host_clk_release(host); |
1da177e4 LT |
782 | } |
783 | ||
7ea239d9 PO |
784 | /* |
785 | * Sets the host clock to the highest possible frequency that | |
786 | * is below "hz". | |
787 | */ | |
778e277c | 788 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
789 | { |
790 | WARN_ON(hz < host->f_min); | |
791 | ||
792 | if (hz > host->f_max) | |
793 | hz = host->f_max; | |
794 | ||
795 | host->ios.clock = hz; | |
796 | mmc_set_ios(host); | |
797 | } | |
798 | ||
778e277c MW |
799 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
800 | { | |
801 | mmc_host_clk_hold(host); | |
802 | __mmc_set_clock(host, hz); | |
803 | mmc_host_clk_release(host); | |
804 | } | |
805 | ||
04566831 LW |
806 | #ifdef CONFIG_MMC_CLKGATE |
807 | /* | |
808 | * This gates the clock by setting it to 0 Hz. | |
809 | */ | |
810 | void mmc_gate_clock(struct mmc_host *host) | |
811 | { | |
812 | unsigned long flags; | |
813 | ||
814 | spin_lock_irqsave(&host->clk_lock, flags); | |
815 | host->clk_old = host->ios.clock; | |
816 | host->ios.clock = 0; | |
817 | host->clk_gated = true; | |
818 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
819 | mmc_set_ios(host); | |
820 | } | |
821 | ||
822 | /* | |
823 | * This restores the clock from gating by using the cached | |
824 | * clock value. | |
825 | */ | |
826 | void mmc_ungate_clock(struct mmc_host *host) | |
827 | { | |
828 | /* | |
829 | * We should previously have gated the clock, so the clock shall | |
830 | * be 0 here! The clock may however be 0 during initialization, | |
831 | * when some request operations are performed before setting | |
832 | * the frequency. When ungate is requested in that situation | |
833 | * we just ignore the call. | |
834 | */ | |
835 | if (host->clk_old) { | |
836 | BUG_ON(host->ios.clock); | |
837 | /* This call will also set host->clk_gated to false */ | |
778e277c | 838 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
839 | } |
840 | } | |
841 | ||
842 | void mmc_set_ungated(struct mmc_host *host) | |
843 | { | |
844 | unsigned long flags; | |
845 | ||
846 | /* | |
847 | * We've been given a new frequency while the clock is gated, | |
848 | * so make sure we regard this as ungating it. | |
849 | */ | |
850 | spin_lock_irqsave(&host->clk_lock, flags); | |
851 | host->clk_gated = false; | |
852 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
853 | } | |
854 | ||
855 | #else | |
856 | void mmc_set_ungated(struct mmc_host *host) | |
857 | { | |
858 | } | |
859 | #endif | |
860 | ||
7ea239d9 PO |
861 | /* |
862 | * Change the bus mode (open drain/push-pull) of a host. | |
863 | */ | |
864 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
865 | { | |
778e277c | 866 | mmc_host_clk_hold(host); |
7ea239d9 PO |
867 | host->ios.bus_mode = mode; |
868 | mmc_set_ios(host); | |
778e277c | 869 | mmc_host_clk_release(host); |
7ea239d9 PO |
870 | } |
871 | ||
0f8d8ea6 AH |
872 | /* |
873 | * Change data bus width of a host. | |
874 | */ | |
875 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
876 | { | |
778e277c | 877 | mmc_host_clk_hold(host); |
4c4cb171 PR |
878 | host->ios.bus_width = width; |
879 | mmc_set_ios(host); | |
778e277c | 880 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
881 | } |
882 | ||
86e8286a AV |
883 | /** |
884 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
885 | * @vdd: voltage (mV) | |
886 | * @low_bits: prefer low bits in boundary cases | |
887 | * | |
888 | * This function returns the OCR bit number according to the provided @vdd | |
889 | * value. If conversion is not possible a negative errno value returned. | |
890 | * | |
891 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
892 | * on boundary voltages. For example, | |
893 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
894 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
895 | * | |
896 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
897 | */ | |
898 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
899 | { | |
900 | const int max_bit = ilog2(MMC_VDD_35_36); | |
901 | int bit; | |
902 | ||
903 | if (vdd < 1650 || vdd > 3600) | |
904 | return -EINVAL; | |
905 | ||
906 | if (vdd >= 1650 && vdd <= 1950) | |
907 | return ilog2(MMC_VDD_165_195); | |
908 | ||
909 | if (low_bits) | |
910 | vdd -= 1; | |
911 | ||
912 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
913 | bit = (vdd - 2000) / 100 + 8; | |
914 | if (bit > max_bit) | |
915 | return max_bit; | |
916 | return bit; | |
917 | } | |
918 | ||
919 | /** | |
920 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
921 | * @vdd_min: minimum voltage value (mV) | |
922 | * @vdd_max: maximum voltage value (mV) | |
923 | * | |
924 | * This function returns the OCR mask bits according to the provided @vdd_min | |
925 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
926 | * | |
927 | * Notes wrt boundary cases: | |
928 | * This function sets the OCR bits for all boundary voltages, for example | |
929 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
930 | * MMC_VDD_34_35 mask. | |
931 | */ | |
932 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
933 | { | |
934 | u32 mask = 0; | |
935 | ||
936 | if (vdd_max < vdd_min) | |
937 | return 0; | |
938 | ||
939 | /* Prefer high bits for the boundary vdd_max values. */ | |
940 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
941 | if (vdd_max < 0) | |
942 | return 0; | |
943 | ||
944 | /* Prefer low bits for the boundary vdd_min values. */ | |
945 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
946 | if (vdd_min < 0) | |
947 | return 0; | |
948 | ||
949 | /* Fill the mask, from max bit to min bit. */ | |
950 | while (vdd_max >= vdd_min) | |
951 | mask |= 1 << vdd_max--; | |
952 | ||
953 | return mask; | |
954 | } | |
955 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
956 | ||
5c13941a DB |
957 | #ifdef CONFIG_REGULATOR |
958 | ||
959 | /** | |
960 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
961 | * @supply: regulator to use | |
962 | * | |
963 | * This returns either a negative errno, or a mask of voltages that | |
964 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
965 | * regulator. This would normally be called before registering the | |
966 | * MMC host adapter. | |
967 | */ | |
968 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
969 | { | |
970 | int result = 0; | |
971 | int count; | |
972 | int i; | |
973 | ||
974 | count = regulator_count_voltages(supply); | |
975 | if (count < 0) | |
976 | return count; | |
977 | ||
978 | for (i = 0; i < count; i++) { | |
979 | int vdd_uV; | |
980 | int vdd_mV; | |
981 | ||
982 | vdd_uV = regulator_list_voltage(supply, i); | |
983 | if (vdd_uV <= 0) | |
984 | continue; | |
985 | ||
986 | vdd_mV = vdd_uV / 1000; | |
987 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
988 | } | |
989 | ||
990 | return result; | |
991 | } | |
992 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
993 | ||
994 | /** | |
995 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 996 | * @mmc: the host to regulate |
5c13941a | 997 | * @supply: regulator to use |
99fc5131 | 998 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
999 | * |
1000 | * Returns zero on success, else negative errno. | |
1001 | * | |
1002 | * MMC host drivers may use this to enable or disable a regulator using | |
1003 | * a particular supply voltage. This would normally be called from the | |
1004 | * set_ios() method. | |
1005 | */ | |
99fc5131 LW |
1006 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1007 | struct regulator *supply, | |
1008 | unsigned short vdd_bit) | |
5c13941a DB |
1009 | { |
1010 | int result = 0; | |
1011 | int min_uV, max_uV; | |
5c13941a DB |
1012 | |
1013 | if (vdd_bit) { | |
1014 | int tmp; | |
1015 | int voltage; | |
1016 | ||
1017 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
1018 | * bits this regulator doesn't quite support ... don't | |
1019 | * be too picky, most cards and regulators are OK with | |
1020 | * a 0.1V range goof (it's a small error percentage). | |
1021 | */ | |
1022 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1023 | if (tmp == 0) { | |
1024 | min_uV = 1650 * 1000; | |
1025 | max_uV = 1950 * 1000; | |
1026 | } else { | |
1027 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1028 | max_uV = min_uV + 100 * 1000; | |
1029 | } | |
1030 | ||
1031 | /* avoid needless changes to this voltage; the regulator | |
1032 | * might not allow this operation | |
1033 | */ | |
1034 | voltage = regulator_get_voltage(supply); | |
1035 | if (voltage < 0) | |
1036 | result = voltage; | |
1037 | else if (voltage < min_uV || voltage > max_uV) | |
1038 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
1039 | else | |
1040 | result = 0; | |
1041 | ||
99fc5131 | 1042 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1043 | result = regulator_enable(supply); |
99fc5131 LW |
1044 | if (!result) |
1045 | mmc->regulator_enabled = true; | |
1046 | } | |
1047 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1048 | result = regulator_disable(supply); |
99fc5131 LW |
1049 | if (result == 0) |
1050 | mmc->regulator_enabled = false; | |
5c13941a DB |
1051 | } |
1052 | ||
99fc5131 LW |
1053 | if (result) |
1054 | dev_err(mmc_dev(mmc), | |
1055 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1056 | return result; |
1057 | } | |
1058 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
1059 | ||
99fc5131 | 1060 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1061 | |
1da177e4 LT |
1062 | /* |
1063 | * Mask off any voltages we don't support and select | |
1064 | * the lowest voltage | |
1065 | */ | |
7ea239d9 | 1066 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1067 | { |
1068 | int bit; | |
1069 | ||
1070 | ocr &= host->ocr_avail; | |
1071 | ||
1072 | bit = ffs(ocr); | |
1073 | if (bit) { | |
1074 | bit -= 1; | |
1075 | ||
63ef731a | 1076 | ocr &= 3 << bit; |
1da177e4 | 1077 | |
778e277c | 1078 | mmc_host_clk_hold(host); |
1da177e4 | 1079 | host->ios.vdd = bit; |
920e70c5 | 1080 | mmc_set_ios(host); |
778e277c | 1081 | mmc_host_clk_release(host); |
1da177e4 | 1082 | } else { |
f6e10b86 DB |
1083 | pr_warning("%s: host doesn't support card's voltages\n", |
1084 | mmc_hostname(host)); | |
1da177e4 LT |
1085 | ocr = 0; |
1086 | } | |
1087 | ||
1088 | return ocr; | |
1089 | } | |
1090 | ||
261bbd46 | 1091 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11) |
f2119df6 AN |
1092 | { |
1093 | struct mmc_command cmd = {0}; | |
1094 | int err = 0; | |
1095 | ||
1096 | BUG_ON(!host); | |
1097 | ||
1098 | /* | |
1099 | * Send CMD11 only if the request is to switch the card to | |
1100 | * 1.8V signalling. | |
1101 | */ | |
261bbd46 | 1102 | if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) { |
f2119df6 AN |
1103 | cmd.opcode = SD_SWITCH_VOLTAGE; |
1104 | cmd.arg = 0; | |
1105 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1106 | ||
1107 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1108 | if (err) | |
1109 | return err; | |
1110 | ||
1111 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1112 | return -EIO; | |
1113 | } | |
1114 | ||
1115 | host->ios.signal_voltage = signal_voltage; | |
1116 | ||
1117 | if (host->ops->start_signal_voltage_switch) | |
1118 | err = host->ops->start_signal_voltage_switch(host, &host->ios); | |
1119 | ||
1120 | return err; | |
1121 | } | |
1122 | ||
b57c43ad | 1123 | /* |
7ea239d9 | 1124 | * Select timing parameters for host. |
b57c43ad | 1125 | */ |
7ea239d9 | 1126 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1127 | { |
778e277c | 1128 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1129 | host->ios.timing = timing; |
1130 | mmc_set_ios(host); | |
778e277c | 1131 | mmc_host_clk_release(host); |
b57c43ad PO |
1132 | } |
1133 | ||
d6d50a15 AN |
1134 | /* |
1135 | * Select appropriate driver type for host. | |
1136 | */ | |
1137 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1138 | { | |
778e277c | 1139 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1140 | host->ios.drv_type = drv_type; |
1141 | mmc_set_ios(host); | |
778e277c | 1142 | mmc_host_clk_release(host); |
d6d50a15 AN |
1143 | } |
1144 | ||
1da177e4 | 1145 | /* |
45f8245b RK |
1146 | * Apply power to the MMC stack. This is a two-stage process. |
1147 | * First, we enable power to the card without the clock running. | |
1148 | * We then wait a bit for the power to stabilise. Finally, | |
1149 | * enable the bus drivers and clock to the card. | |
1150 | * | |
1151 | * We must _NOT_ enable the clock prior to power stablising. | |
1152 | * | |
1153 | * If a host does all the power sequencing itself, ignore the | |
1154 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
1155 | */ |
1156 | static void mmc_power_up(struct mmc_host *host) | |
1157 | { | |
500f3564 BR |
1158 | int bit; |
1159 | ||
778e277c MW |
1160 | mmc_host_clk_hold(host); |
1161 | ||
500f3564 BR |
1162 | /* If ocr is set, we use it */ |
1163 | if (host->ocr) | |
1164 | bit = ffs(host->ocr) - 1; | |
1165 | else | |
1166 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1167 | |
1168 | host->ios.vdd = bit; | |
44669034 | 1169 | if (mmc_host_is_spi(host)) |
af517150 | 1170 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1171 | else |
af517150 | 1172 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1173 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1174 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1175 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1176 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1177 | mmc_set_ios(host); |
1da177e4 | 1178 | |
f9996aee PO |
1179 | /* |
1180 | * This delay should be sufficient to allow the power supply | |
1181 | * to reach the minimum voltage. | |
1182 | */ | |
79bccc5a | 1183 | mmc_delay(10); |
1da177e4 | 1184 | |
88ae8b86 | 1185 | host->ios.clock = host->f_init; |
8dfd0374 | 1186 | |
1da177e4 | 1187 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1188 | mmc_set_ios(host); |
1da177e4 | 1189 | |
f9996aee PO |
1190 | /* |
1191 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1192 | * time required to reach a stable voltage. | |
1193 | */ | |
79bccc5a | 1194 | mmc_delay(10); |
778e277c MW |
1195 | |
1196 | mmc_host_clk_release(host); | |
1da177e4 LT |
1197 | } |
1198 | ||
7f7e4129 | 1199 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1200 | { |
778e277c MW |
1201 | mmc_host_clk_hold(host); |
1202 | ||
1da177e4 LT |
1203 | host->ios.clock = 0; |
1204 | host->ios.vdd = 0; | |
b33d46c3 UH |
1205 | |
1206 | /* | |
1207 | * Reset ocr mask to be the highest possible voltage supported for | |
1208 | * this mmc host. This value will be used at next power up. | |
1209 | */ | |
1210 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1211 | ||
af517150 DB |
1212 | if (!mmc_host_is_spi(host)) { |
1213 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1214 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1215 | } | |
1da177e4 | 1216 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1217 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1218 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1219 | mmc_set_ios(host); |
778e277c | 1220 | |
041beb1d DD |
1221 | /* |
1222 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1223 | * XO-1.5, require a short delay after poweroff before the card | |
1224 | * can be successfully turned on again. | |
1225 | */ | |
1226 | mmc_delay(1); | |
1227 | ||
778e277c | 1228 | mmc_host_clk_release(host); |
1da177e4 LT |
1229 | } |
1230 | ||
39361851 AB |
1231 | /* |
1232 | * Cleanup when the last reference to the bus operator is dropped. | |
1233 | */ | |
261172fd | 1234 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1235 | { |
1236 | BUG_ON(!host); | |
1237 | BUG_ON(host->bus_refs); | |
1238 | BUG_ON(!host->bus_dead); | |
1239 | ||
1240 | host->bus_ops = NULL; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * Increase reference count of bus operator | |
1245 | */ | |
1246 | static inline void mmc_bus_get(struct mmc_host *host) | |
1247 | { | |
1248 | unsigned long flags; | |
1249 | ||
1250 | spin_lock_irqsave(&host->lock, flags); | |
1251 | host->bus_refs++; | |
1252 | spin_unlock_irqrestore(&host->lock, flags); | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Decrease reference count of bus operator and free it if | |
1257 | * it is the last reference. | |
1258 | */ | |
1259 | static inline void mmc_bus_put(struct mmc_host *host) | |
1260 | { | |
1261 | unsigned long flags; | |
1262 | ||
1263 | spin_lock_irqsave(&host->lock, flags); | |
1264 | host->bus_refs--; | |
1265 | if ((host->bus_refs == 0) && host->bus_ops) | |
1266 | __mmc_release_bus(host); | |
1267 | spin_unlock_irqrestore(&host->lock, flags); | |
1268 | } | |
1269 | ||
1da177e4 | 1270 | /* |
7ea239d9 PO |
1271 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1272 | * host at any given time. | |
1da177e4 | 1273 | */ |
7ea239d9 | 1274 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1275 | { |
7ea239d9 | 1276 | unsigned long flags; |
e45a1bd2 | 1277 | |
7ea239d9 PO |
1278 | BUG_ON(!host); |
1279 | BUG_ON(!ops); | |
b855885e | 1280 | |
d84075c8 | 1281 | WARN_ON(!host->claimed); |
bce40a36 | 1282 | |
7ea239d9 | 1283 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1284 | |
7ea239d9 PO |
1285 | BUG_ON(host->bus_ops); |
1286 | BUG_ON(host->bus_refs); | |
b57c43ad | 1287 | |
7ea239d9 PO |
1288 | host->bus_ops = ops; |
1289 | host->bus_refs = 1; | |
1290 | host->bus_dead = 0; | |
b57c43ad | 1291 | |
7ea239d9 | 1292 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1293 | } |
1294 | ||
7ea239d9 | 1295 | /* |
7f7e4129 | 1296 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1297 | */ |
1298 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1299 | { |
7ea239d9 | 1300 | unsigned long flags; |
7ccd266e | 1301 | |
7ea239d9 | 1302 | BUG_ON(!host); |
7ccd266e | 1303 | |
d84075c8 PO |
1304 | WARN_ON(!host->claimed); |
1305 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1306 | |
7ea239d9 | 1307 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1308 | |
7ea239d9 | 1309 | host->bus_dead = 1; |
7ccd266e | 1310 | |
7ea239d9 | 1311 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1312 | |
7ea239d9 | 1313 | mmc_bus_put(host); |
1da177e4 LT |
1314 | } |
1315 | ||
1da177e4 LT |
1316 | /** |
1317 | * mmc_detect_change - process change of state on a MMC socket | |
1318 | * @host: host which changed state. | |
8dc00335 | 1319 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1320 | * |
67a61c48 PO |
1321 | * MMC drivers should call this when they detect a card has been |
1322 | * inserted or removed. The MMC layer will confirm that any | |
1323 | * present card is still functional, and initialize any newly | |
1324 | * inserted. | |
1da177e4 | 1325 | */ |
8dc00335 | 1326 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1327 | { |
3b91e550 | 1328 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1329 | unsigned long flags; |
01f41ec7 | 1330 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1331 | WARN_ON(host->removed); |
01f41ec7 | 1332 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1333 | #endif |
1334 | ||
c4028958 | 1335 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1336 | } |
1337 | ||
1338 | EXPORT_SYMBOL(mmc_detect_change); | |
1339 | ||
dfe86cba AH |
1340 | void mmc_init_erase(struct mmc_card *card) |
1341 | { | |
1342 | unsigned int sz; | |
1343 | ||
1344 | if (is_power_of_2(card->erase_size)) | |
1345 | card->erase_shift = ffs(card->erase_size) - 1; | |
1346 | else | |
1347 | card->erase_shift = 0; | |
1348 | ||
1349 | /* | |
1350 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1351 | * card. That is not desirable because it can take a long time | |
1352 | * (minutes) potentially delaying more important I/O, and also the | |
1353 | * timeout calculations become increasingly hugely over-estimated. | |
1354 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1355 | * to that size and alignment. | |
1356 | * | |
1357 | * For SD cards that define Allocation Unit size, limit erases to one | |
1358 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1359 | * Erase Size, whether it is switched on or not, limit to that size. | |
1360 | * Otherwise just have a stab at a good value. For modern cards it | |
1361 | * will end up being 4MiB. Note that if the value is too small, it | |
1362 | * can end up taking longer to erase. | |
1363 | */ | |
1364 | if (mmc_card_sd(card) && card->ssr.au) { | |
1365 | card->pref_erase = card->ssr.au; | |
1366 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1367 | } else if (card->ext_csd.hc_erase_size) { | |
1368 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1369 | } else { | |
1370 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1371 | if (sz < 128) | |
1372 | card->pref_erase = 512 * 1024 / 512; | |
1373 | else if (sz < 512) | |
1374 | card->pref_erase = 1024 * 1024 / 512; | |
1375 | else if (sz < 1024) | |
1376 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1377 | else | |
1378 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1379 | if (card->pref_erase < card->erase_size) | |
1380 | card->pref_erase = card->erase_size; | |
1381 | else { | |
1382 | sz = card->pref_erase % card->erase_size; | |
1383 | if (sz) | |
1384 | card->pref_erase += card->erase_size - sz; | |
1385 | } | |
1386 | } | |
1387 | } | |
1388 | ||
eaa02f75 AW |
1389 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1390 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1391 | { |
1392 | unsigned int erase_timeout; | |
1393 | ||
1394 | if (card->ext_csd.erase_group_def & 1) { | |
1395 | /* High Capacity Erase Group Size uses HC timeouts */ | |
1396 | if (arg == MMC_TRIM_ARG) | |
1397 | erase_timeout = card->ext_csd.trim_timeout; | |
1398 | else | |
1399 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1400 | } else { | |
1401 | /* CSD Erase Group Size uses write timeout */ | |
1402 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1403 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1404 | unsigned int timeout_us; | |
1405 | ||
1406 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1407 | if (card->csd.tacc_ns < 1000000) | |
1408 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1409 | else | |
1410 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1411 | ||
1412 | /* | |
1413 | * ios.clock is only a target. The real clock rate might be | |
1414 | * less but not that much less, so fudge it by multiplying by 2. | |
1415 | */ | |
1416 | timeout_clks <<= 1; | |
1417 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1418 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1419 | |
1420 | erase_timeout = timeout_us / 1000; | |
1421 | ||
1422 | /* | |
1423 | * Theoretically, the calculation could underflow so round up | |
1424 | * to 1ms in that case. | |
1425 | */ | |
1426 | if (!erase_timeout) | |
1427 | erase_timeout = 1; | |
1428 | } | |
1429 | ||
1430 | /* Multiplier for secure operations */ | |
1431 | if (arg & MMC_SECURE_ARGS) { | |
1432 | if (arg == MMC_SECURE_ERASE_ARG) | |
1433 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1434 | else | |
1435 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1436 | } | |
1437 | ||
1438 | erase_timeout *= qty; | |
1439 | ||
1440 | /* | |
1441 | * Ensure at least a 1 second timeout for SPI as per | |
1442 | * 'mmc_set_data_timeout()' | |
1443 | */ | |
1444 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1445 | erase_timeout = 1000; | |
1446 | ||
eaa02f75 | 1447 | return erase_timeout; |
dfe86cba AH |
1448 | } |
1449 | ||
eaa02f75 AW |
1450 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1451 | unsigned int arg, | |
1452 | unsigned int qty) | |
dfe86cba | 1453 | { |
eaa02f75 AW |
1454 | unsigned int erase_timeout; |
1455 | ||
dfe86cba AH |
1456 | if (card->ssr.erase_timeout) { |
1457 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1458 | erase_timeout = card->ssr.erase_timeout * qty + |
1459 | card->ssr.erase_offset; | |
dfe86cba AH |
1460 | } else { |
1461 | /* | |
1462 | * Erase timeout not specified in SD Status Register (SSR) so | |
1463 | * use 250ms per write block. | |
1464 | */ | |
eaa02f75 | 1465 | erase_timeout = 250 * qty; |
dfe86cba AH |
1466 | } |
1467 | ||
1468 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1469 | if (erase_timeout < 1000) |
1470 | erase_timeout = 1000; | |
1471 | ||
1472 | return erase_timeout; | |
dfe86cba AH |
1473 | } |
1474 | ||
eaa02f75 AW |
1475 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1476 | unsigned int arg, | |
1477 | unsigned int qty) | |
dfe86cba AH |
1478 | { |
1479 | if (mmc_card_sd(card)) | |
eaa02f75 | 1480 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1481 | else |
eaa02f75 | 1482 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1483 | } |
1484 | ||
1485 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1486 | unsigned int to, unsigned int arg) | |
1487 | { | |
1278dba1 | 1488 | struct mmc_command cmd = {0}; |
dfe86cba AH |
1489 | unsigned int qty = 0; |
1490 | int err; | |
1491 | ||
1492 | /* | |
1493 | * qty is used to calculate the erase timeout which depends on how many | |
1494 | * erase groups (or allocation units in SD terminology) are affected. | |
1495 | * We count erasing part of an erase group as one erase group. | |
1496 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1497 | * erase group size is almost certainly also power of 2, but it does not | |
1498 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1499 | * division in that case. SD may not specify an allocation unit size, | |
1500 | * in which case the timeout is based on the number of write blocks. | |
1501 | * | |
1502 | * Note that the timeout for secure trim 2 will only be correct if the | |
1503 | * number of erase groups specified is the same as the total of all | |
1504 | * preceding secure trim 1 commands. Since the power may have been | |
1505 | * lost since the secure trim 1 commands occurred, it is generally | |
1506 | * impossible to calculate the secure trim 2 timeout correctly. | |
1507 | */ | |
1508 | if (card->erase_shift) | |
1509 | qty += ((to >> card->erase_shift) - | |
1510 | (from >> card->erase_shift)) + 1; | |
1511 | else if (mmc_card_sd(card)) | |
1512 | qty += to - from + 1; | |
1513 | else | |
1514 | qty += ((to / card->erase_size) - | |
1515 | (from / card->erase_size)) + 1; | |
1516 | ||
1517 | if (!mmc_card_blockaddr(card)) { | |
1518 | from <<= 9; | |
1519 | to <<= 9; | |
1520 | } | |
1521 | ||
dfe86cba AH |
1522 | if (mmc_card_sd(card)) |
1523 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1524 | else | |
1525 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1526 | cmd.arg = from; | |
1527 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1528 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1529 | if (err) { | |
1530 | printk(KERN_ERR "mmc_erase: group start error %d, " | |
1531 | "status %#x\n", err, cmd.resp[0]); | |
1532 | err = -EINVAL; | |
1533 | goto out; | |
1534 | } | |
1535 | ||
1536 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1537 | if (mmc_card_sd(card)) | |
1538 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1539 | else | |
1540 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1541 | cmd.arg = to; | |
1542 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1543 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1544 | if (err) { | |
1545 | printk(KERN_ERR "mmc_erase: group end error %d, status %#x\n", | |
1546 | err, cmd.resp[0]); | |
1547 | err = -EINVAL; | |
1548 | goto out; | |
1549 | } | |
1550 | ||
1551 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1552 | cmd.opcode = MMC_ERASE; | |
1553 | cmd.arg = arg; | |
1554 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1555 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1556 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1557 | if (err) { | |
1558 | printk(KERN_ERR "mmc_erase: erase error %d, status %#x\n", | |
1559 | err, cmd.resp[0]); | |
1560 | err = -EIO; | |
1561 | goto out; | |
1562 | } | |
1563 | ||
1564 | if (mmc_host_is_spi(card->host)) | |
1565 | goto out; | |
1566 | ||
1567 | do { | |
1568 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1569 | cmd.opcode = MMC_SEND_STATUS; | |
1570 | cmd.arg = card->rca << 16; | |
1571 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1572 | /* Do not retry else we can't see errors */ | |
1573 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1574 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
1575 | printk(KERN_ERR "error %d requesting status %#x\n", | |
1576 | err, cmd.resp[0]); | |
1577 | err = -EIO; | |
1578 | goto out; | |
1579 | } | |
1580 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
7435bb79 | 1581 | R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG); |
dfe86cba AH |
1582 | out: |
1583 | return err; | |
1584 | } | |
1585 | ||
1586 | /** | |
1587 | * mmc_erase - erase sectors. | |
1588 | * @card: card to erase | |
1589 | * @from: first sector to erase | |
1590 | * @nr: number of sectors to erase | |
1591 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1592 | * | |
1593 | * Caller must claim host before calling this function. | |
1594 | */ | |
1595 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1596 | unsigned int arg) | |
1597 | { | |
1598 | unsigned int rem, to = from + nr; | |
1599 | ||
1600 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1601 | !(card->csd.cmdclass & CCC_ERASE)) | |
1602 | return -EOPNOTSUPP; | |
1603 | ||
1604 | if (!card->erase_size) | |
1605 | return -EOPNOTSUPP; | |
1606 | ||
1607 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1608 | return -EOPNOTSUPP; | |
1609 | ||
1610 | if ((arg & MMC_SECURE_ARGS) && | |
1611 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1612 | return -EOPNOTSUPP; | |
1613 | ||
1614 | if ((arg & MMC_TRIM_ARGS) && | |
1615 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1616 | return -EOPNOTSUPP; | |
1617 | ||
1618 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1619 | if (from % card->erase_size || nr % card->erase_size) | |
1620 | return -EINVAL; | |
1621 | } | |
1622 | ||
1623 | if (arg == MMC_ERASE_ARG) { | |
1624 | rem = from % card->erase_size; | |
1625 | if (rem) { | |
1626 | rem = card->erase_size - rem; | |
1627 | from += rem; | |
1628 | if (nr > rem) | |
1629 | nr -= rem; | |
1630 | else | |
1631 | return 0; | |
1632 | } | |
1633 | rem = nr % card->erase_size; | |
1634 | if (rem) | |
1635 | nr -= rem; | |
1636 | } | |
1637 | ||
1638 | if (nr == 0) | |
1639 | return 0; | |
1640 | ||
1641 | to = from + nr; | |
1642 | ||
1643 | if (to <= from) | |
1644 | return -EINVAL; | |
1645 | ||
1646 | /* 'from' and 'to' are inclusive */ | |
1647 | to -= 1; | |
1648 | ||
1649 | return mmc_do_erase(card, from, to, arg); | |
1650 | } | |
1651 | EXPORT_SYMBOL(mmc_erase); | |
1652 | ||
1653 | int mmc_can_erase(struct mmc_card *card) | |
1654 | { | |
1655 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1656 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1657 | return 1; | |
1658 | return 0; | |
1659 | } | |
1660 | EXPORT_SYMBOL(mmc_can_erase); | |
1661 | ||
1662 | int mmc_can_trim(struct mmc_card *card) | |
1663 | { | |
1664 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
1665 | return 1; | |
1666 | return 0; | |
1667 | } | |
1668 | EXPORT_SYMBOL(mmc_can_trim); | |
1669 | ||
1670 | int mmc_can_secure_erase_trim(struct mmc_card *card) | |
1671 | { | |
1672 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
1673 | return 1; | |
1674 | return 0; | |
1675 | } | |
1676 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
1677 | ||
1678 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
1679 | unsigned int nr) | |
1680 | { | |
1681 | if (!card->erase_size) | |
1682 | return 0; | |
1683 | if (from % card->erase_size || nr % card->erase_size) | |
1684 | return 0; | |
1685 | return 1; | |
1686 | } | |
1687 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 1688 | |
e056a1b5 AH |
1689 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
1690 | unsigned int arg) | |
1691 | { | |
1692 | struct mmc_host *host = card->host; | |
1693 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
1694 | unsigned int last_timeout = 0; | |
1695 | ||
1696 | if (card->erase_shift) | |
1697 | max_qty = UINT_MAX >> card->erase_shift; | |
1698 | else if (mmc_card_sd(card)) | |
1699 | max_qty = UINT_MAX; | |
1700 | else | |
1701 | max_qty = UINT_MAX / card->erase_size; | |
1702 | ||
1703 | /* Find the largest qty with an OK timeout */ | |
1704 | do { | |
1705 | y = 0; | |
1706 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
1707 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
1708 | if (timeout > host->max_discard_to) | |
1709 | break; | |
1710 | if (timeout < last_timeout) | |
1711 | break; | |
1712 | last_timeout = timeout; | |
1713 | y = x; | |
1714 | } | |
1715 | qty += y; | |
1716 | } while (y); | |
1717 | ||
1718 | if (!qty) | |
1719 | return 0; | |
1720 | ||
1721 | if (qty == 1) | |
1722 | return 1; | |
1723 | ||
1724 | /* Convert qty to sectors */ | |
1725 | if (card->erase_shift) | |
1726 | max_discard = --qty << card->erase_shift; | |
1727 | else if (mmc_card_sd(card)) | |
1728 | max_discard = qty; | |
1729 | else | |
1730 | max_discard = --qty * card->erase_size; | |
1731 | ||
1732 | return max_discard; | |
1733 | } | |
1734 | ||
1735 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
1736 | { | |
1737 | struct mmc_host *host = card->host; | |
1738 | unsigned int max_discard, max_trim; | |
1739 | ||
1740 | if (!host->max_discard_to) | |
1741 | return UINT_MAX; | |
1742 | ||
1743 | /* | |
1744 | * Without erase_group_def set, MMC erase timeout depends on clock | |
1745 | * frequence which can change. In that case, the best choice is | |
1746 | * just the preferred erase size. | |
1747 | */ | |
1748 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
1749 | return card->pref_erase; | |
1750 | ||
1751 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
1752 | if (mmc_can_trim(card)) { | |
1753 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
1754 | if (max_trim < max_discard) | |
1755 | max_discard = max_trim; | |
1756 | } else if (max_discard < card->erase_size) { | |
1757 | max_discard = 0; | |
1758 | } | |
1759 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
1760 | mmc_hostname(host), max_discard, host->max_discard_to); | |
1761 | return max_discard; | |
1762 | } | |
1763 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
1764 | ||
0f8d8ea6 AH |
1765 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
1766 | { | |
1278dba1 | 1767 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
1768 | |
1769 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
1770 | return 0; | |
1771 | ||
0f8d8ea6 AH |
1772 | cmd.opcode = MMC_SET_BLOCKLEN; |
1773 | cmd.arg = blocklen; | |
1774 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1775 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
1776 | } | |
1777 | EXPORT_SYMBOL(mmc_set_blocklen); | |
1778 | ||
807e8e40 AR |
1779 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
1780 | { | |
1781 | host->f_init = freq; | |
1782 | ||
1783 | #ifdef CONFIG_MMC_DEBUG | |
1784 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
1785 | mmc_hostname(host), __func__, host->f_init); | |
1786 | #endif | |
1787 | mmc_power_up(host); | |
2f94e55a PR |
1788 | |
1789 | /* | |
1790 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
1791 | * if the card is being re-initialized, just send it. CMD52 | |
1792 | * should be ignored by SD/eMMC cards. | |
1793 | */ | |
807e8e40 AR |
1794 | sdio_reset(host); |
1795 | mmc_go_idle(host); | |
1796 | ||
1797 | mmc_send_if_cond(host, host->ocr_avail); | |
1798 | ||
1799 | /* Order's important: probe SDIO, then SD, then MMC */ | |
1800 | if (!mmc_attach_sdio(host)) | |
1801 | return 0; | |
1802 | if (!mmc_attach_sd(host)) | |
1803 | return 0; | |
1804 | if (!mmc_attach_mmc(host)) | |
1805 | return 0; | |
1806 | ||
1807 | mmc_power_off(host); | |
1808 | return -EIO; | |
1809 | } | |
1810 | ||
b93931a6 | 1811 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 1812 | { |
807e8e40 | 1813 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
c4028958 DH |
1814 | struct mmc_host *host = |
1815 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 1816 | int i; |
4c2ef25f | 1817 | |
807e8e40 | 1818 | if (host->rescan_disable) |
4c2ef25f | 1819 | return; |
1da177e4 | 1820 | |
7ea239d9 | 1821 | mmc_bus_get(host); |
b855885e | 1822 | |
30201e7f OBC |
1823 | /* |
1824 | * if there is a _removable_ card registered, check whether it is | |
1825 | * still present | |
1826 | */ | |
1827 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 1828 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
1829 | host->bus_ops->detect(host); |
1830 | ||
c5841798 CB |
1831 | /* |
1832 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
1833 | * the card is no longer present. | |
1834 | */ | |
94d89efb | 1835 | mmc_bus_put(host); |
94d89efb JS |
1836 | mmc_bus_get(host); |
1837 | ||
1838 | /* if there still is a card present, stop here */ | |
1839 | if (host->bus_ops != NULL) { | |
7ea239d9 | 1840 | mmc_bus_put(host); |
94d89efb JS |
1841 | goto out; |
1842 | } | |
1da177e4 | 1843 | |
94d89efb JS |
1844 | /* |
1845 | * Only we can add a new handler, so it's safe to | |
1846 | * release the lock here. | |
1847 | */ | |
1848 | mmc_bus_put(host); | |
1da177e4 | 1849 | |
94d89efb JS |
1850 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
1851 | goto out; | |
1da177e4 | 1852 | |
807e8e40 | 1853 | mmc_claim_host(host); |
88ae8b86 | 1854 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
1855 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
1856 | break; | |
06b2233a | 1857 | if (freqs[i] <= host->f_min) |
807e8e40 | 1858 | break; |
88ae8b86 | 1859 | } |
807e8e40 AR |
1860 | mmc_release_host(host); |
1861 | ||
1862 | out: | |
28f52482 AV |
1863 | if (host->caps & MMC_CAP_NEEDS_POLL) |
1864 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
1865 | } |
1866 | ||
b93931a6 | 1867 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 1868 | { |
b93931a6 PO |
1869 | mmc_power_off(host); |
1870 | mmc_detect_change(host, 0); | |
1da177e4 LT |
1871 | } |
1872 | ||
b93931a6 | 1873 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 1874 | { |
3b91e550 | 1875 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
1876 | unsigned long flags; |
1877 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 1878 | host->removed = 1; |
1efd48b3 | 1879 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
1880 | #endif |
1881 | ||
8ea926b2 AH |
1882 | if (host->caps & MMC_CAP_DISABLE) |
1883 | cancel_delayed_work(&host->disable); | |
d9bcbf34 | 1884 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
1885 | mmc_flush_scheduled_work(); |
1886 | ||
da68c4eb NP |
1887 | /* clear pm flags now and let card drivers set them as needed */ |
1888 | host->pm_flags = 0; | |
1889 | ||
7ea239d9 PO |
1890 | mmc_bus_get(host); |
1891 | if (host->bus_ops && !host->bus_dead) { | |
1892 | if (host->bus_ops->remove) | |
1893 | host->bus_ops->remove(host); | |
1894 | ||
1895 | mmc_claim_host(host); | |
1896 | mmc_detach_bus(host); | |
7f7e4129 | 1897 | mmc_power_off(host); |
7ea239d9 | 1898 | mmc_release_host(host); |
53509f0f DK |
1899 | mmc_bus_put(host); |
1900 | return; | |
1da177e4 | 1901 | } |
7ea239d9 PO |
1902 | mmc_bus_put(host); |
1903 | ||
1904 | BUG_ON(host->card); | |
1da177e4 LT |
1905 | |
1906 | mmc_power_off(host); | |
1907 | } | |
1908 | ||
12ae637f | 1909 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 1910 | { |
12ae637f OBC |
1911 | int ret = 0; |
1912 | ||
bb9cab94 DD |
1913 | #ifdef CONFIG_MMC_DEBUG |
1914 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
1915 | #endif | |
1916 | ||
eae1aeee AH |
1917 | mmc_bus_get(host); |
1918 | ||
1919 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1920 | mmc_bus_put(host); | |
12ae637f | 1921 | return -EINVAL; |
eae1aeee AH |
1922 | } |
1923 | ||
1924 | if (host->bus_ops->power_save) | |
12ae637f | 1925 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
1926 | |
1927 | mmc_bus_put(host); | |
1928 | ||
1929 | mmc_power_off(host); | |
12ae637f OBC |
1930 | |
1931 | return ret; | |
eae1aeee AH |
1932 | } |
1933 | EXPORT_SYMBOL(mmc_power_save_host); | |
1934 | ||
12ae637f | 1935 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 1936 | { |
12ae637f OBC |
1937 | int ret; |
1938 | ||
bb9cab94 DD |
1939 | #ifdef CONFIG_MMC_DEBUG |
1940 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
1941 | #endif | |
1942 | ||
eae1aeee AH |
1943 | mmc_bus_get(host); |
1944 | ||
1945 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
1946 | mmc_bus_put(host); | |
12ae637f | 1947 | return -EINVAL; |
eae1aeee AH |
1948 | } |
1949 | ||
1950 | mmc_power_up(host); | |
12ae637f | 1951 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
1952 | |
1953 | mmc_bus_put(host); | |
12ae637f OBC |
1954 | |
1955 | return ret; | |
eae1aeee AH |
1956 | } |
1957 | EXPORT_SYMBOL(mmc_power_restore_host); | |
1958 | ||
b1ebe384 JL |
1959 | int mmc_card_awake(struct mmc_host *host) |
1960 | { | |
1961 | int err = -ENOSYS; | |
1962 | ||
1963 | mmc_bus_get(host); | |
1964 | ||
1965 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1966 | err = host->bus_ops->awake(host); | |
1967 | ||
1968 | mmc_bus_put(host); | |
1969 | ||
1970 | return err; | |
1971 | } | |
1972 | EXPORT_SYMBOL(mmc_card_awake); | |
1973 | ||
1974 | int mmc_card_sleep(struct mmc_host *host) | |
1975 | { | |
1976 | int err = -ENOSYS; | |
1977 | ||
1978 | mmc_bus_get(host); | |
1979 | ||
1980 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
1981 | err = host->bus_ops->sleep(host); | |
1982 | ||
1983 | mmc_bus_put(host); | |
1984 | ||
1985 | return err; | |
1986 | } | |
1987 | EXPORT_SYMBOL(mmc_card_sleep); | |
1988 | ||
1989 | int mmc_card_can_sleep(struct mmc_host *host) | |
1990 | { | |
1991 | struct mmc_card *card = host->card; | |
1992 | ||
1993 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
1994 | return 1; | |
1995 | return 0; | |
1996 | } | |
1997 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
1998 | ||
1da177e4 LT |
1999 | #ifdef CONFIG_PM |
2000 | ||
2001 | /** | |
2002 | * mmc_suspend_host - suspend a host | |
2003 | * @host: mmc host | |
1da177e4 | 2004 | */ |
1a13f8fa | 2005 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 2006 | { |
95cdfb72 NP |
2007 | int err = 0; |
2008 | ||
8ea926b2 AH |
2009 | if (host->caps & MMC_CAP_DISABLE) |
2010 | cancel_delayed_work(&host->disable); | |
7de427d0 | 2011 | cancel_delayed_work(&host->detect); |
b5af25be PO |
2012 | mmc_flush_scheduled_work(); |
2013 | ||
7ea239d9 PO |
2014 | mmc_bus_get(host); |
2015 | if (host->bus_ops && !host->bus_dead) { | |
6abaa0c9 | 2016 | if (host->bus_ops->suspend) |
95cdfb72 | 2017 | err = host->bus_ops->suspend(host); |
1c8cf9c9 OBC |
2018 | if (err == -ENOSYS || !host->bus_ops->resume) { |
2019 | /* | |
2020 | * We simply "remove" the card in this case. | |
2021 | * It will be redetected on resume. | |
2022 | */ | |
2023 | if (host->bus_ops->remove) | |
2024 | host->bus_ops->remove(host); | |
2025 | mmc_claim_host(host); | |
2026 | mmc_detach_bus(host); | |
7f7e4129 | 2027 | mmc_power_off(host); |
1c8cf9c9 OBC |
2028 | mmc_release_host(host); |
2029 | host->pm_flags = 0; | |
2030 | err = 0; | |
2031 | } | |
b5af25be | 2032 | } |
7ea239d9 PO |
2033 | mmc_bus_put(host); |
2034 | ||
a5e9425d | 2035 | if (!err && !mmc_card_keep_power(host)) |
95cdfb72 | 2036 | mmc_power_off(host); |
1da177e4 | 2037 | |
95cdfb72 | 2038 | return err; |
1da177e4 LT |
2039 | } |
2040 | ||
2041 | EXPORT_SYMBOL(mmc_suspend_host); | |
2042 | ||
2043 | /** | |
2044 | * mmc_resume_host - resume a previously suspended host | |
2045 | * @host: mmc host | |
2046 | */ | |
2047 | int mmc_resume_host(struct mmc_host *host) | |
2048 | { | |
95cdfb72 NP |
2049 | int err = 0; |
2050 | ||
6abaa0c9 PO |
2051 | mmc_bus_get(host); |
2052 | if (host->bus_ops && !host->bus_dead) { | |
a5e9425d | 2053 | if (!mmc_card_keep_power(host)) { |
da68c4eb NP |
2054 | mmc_power_up(host); |
2055 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
2056 | /* |
2057 | * Tell runtime PM core we just powered up the card, | |
2058 | * since it still believes the card is powered off. | |
2059 | * Note that currently runtime PM is only enabled | |
2060 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
2061 | */ | |
2062 | if (mmc_card_sdio(host->card) && | |
2063 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
2064 | pm_runtime_disable(&host->card->dev); | |
2065 | pm_runtime_set_active(&host->card->dev); | |
2066 | pm_runtime_enable(&host->card->dev); | |
2067 | } | |
da68c4eb | 2068 | } |
6abaa0c9 | 2069 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
2070 | err = host->bus_ops->resume(host); |
2071 | if (err) { | |
2072 | printk(KERN_WARNING "%s: error %d during resume " | |
2073 | "(card was removed?)\n", | |
2074 | mmc_hostname(host), err); | |
95cdfb72 NP |
2075 | err = 0; |
2076 | } | |
6abaa0c9 | 2077 | } |
a8e6df73 | 2078 | host->pm_flags &= ~MMC_PM_KEEP_POWER; |
6abaa0c9 PO |
2079 | mmc_bus_put(host); |
2080 | ||
95cdfb72 | 2081 | return err; |
1da177e4 | 2082 | } |
1da177e4 LT |
2083 | EXPORT_SYMBOL(mmc_resume_host); |
2084 | ||
4c2ef25f ML |
2085 | /* Do the card removal on suspend if card is assumed removeable |
2086 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2087 | to sync the card. | |
2088 | */ | |
2089 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2090 | unsigned long mode, void *unused) | |
2091 | { | |
2092 | struct mmc_host *host = container_of( | |
2093 | notify_block, struct mmc_host, pm_notify); | |
2094 | unsigned long flags; | |
2095 | ||
2096 | ||
2097 | switch (mode) { | |
2098 | case PM_HIBERNATION_PREPARE: | |
2099 | case PM_SUSPEND_PREPARE: | |
2100 | ||
2101 | spin_lock_irqsave(&host->lock, flags); | |
2102 | host->rescan_disable = 1; | |
2103 | spin_unlock_irqrestore(&host->lock, flags); | |
2104 | cancel_delayed_work_sync(&host->detect); | |
2105 | ||
2106 | if (!host->bus_ops || host->bus_ops->suspend) | |
2107 | break; | |
2108 | ||
2109 | mmc_claim_host(host); | |
2110 | ||
2111 | if (host->bus_ops->remove) | |
2112 | host->bus_ops->remove(host); | |
2113 | ||
2114 | mmc_detach_bus(host); | |
7f7e4129 | 2115 | mmc_power_off(host); |
4c2ef25f ML |
2116 | mmc_release_host(host); |
2117 | host->pm_flags = 0; | |
2118 | break; | |
2119 | ||
2120 | case PM_POST_SUSPEND: | |
2121 | case PM_POST_HIBERNATION: | |
274476f8 | 2122 | case PM_POST_RESTORE: |
4c2ef25f ML |
2123 | |
2124 | spin_lock_irqsave(&host->lock, flags); | |
2125 | host->rescan_disable = 0; | |
2126 | spin_unlock_irqrestore(&host->lock, flags); | |
2127 | mmc_detect_change(host, 0); | |
2128 | ||
2129 | } | |
2130 | ||
2131 | return 0; | |
2132 | } | |
1da177e4 LT |
2133 | #endif |
2134 | ||
ffce2e7e PO |
2135 | static int __init mmc_init(void) |
2136 | { | |
2137 | int ret; | |
2138 | ||
0d9ee5b2 | 2139 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2140 | if (!workqueue) |
2141 | return -ENOMEM; | |
2142 | ||
2143 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2144 | if (ret) |
2145 | goto destroy_workqueue; | |
2146 | ||
2147 | ret = mmc_register_host_class(); | |
2148 | if (ret) | |
2149 | goto unregister_bus; | |
2150 | ||
2151 | ret = sdio_register_bus(); | |
2152 | if (ret) | |
2153 | goto unregister_host_class; | |
2154 | ||
2155 | return 0; | |
2156 | ||
2157 | unregister_host_class: | |
2158 | mmc_unregister_host_class(); | |
2159 | unregister_bus: | |
2160 | mmc_unregister_bus(); | |
2161 | destroy_workqueue: | |
2162 | destroy_workqueue(workqueue); | |
2163 | ||
ffce2e7e PO |
2164 | return ret; |
2165 | } | |
2166 | ||
2167 | static void __exit mmc_exit(void) | |
2168 | { | |
e29a7d73 | 2169 | sdio_unregister_bus(); |
ffce2e7e PO |
2170 | mmc_unregister_host_class(); |
2171 | mmc_unregister_bus(); | |
2172 | destroy_workqueue(workqueue); | |
2173 | } | |
2174 | ||
26074962 | 2175 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2176 | module_exit(mmc_exit); |
2177 | ||
1da177e4 | 2178 | MODULE_LICENSE("GPL"); |