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> |
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 | ||
d3049504 | 143 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
144 | /* |
145 | * Request starter must handle retries - see | |
146 | * mmc_wait_for_req_done(). | |
147 | */ | |
148 | if (mrq->done) | |
149 | mrq->done(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; | |
d3049504 AH |
250 | if (mmc_card_removed(host->card)) { |
251 | mrq->cmd->error = -ENOMEDIUM; | |
252 | complete(&mrq->completion); | |
253 | return; | |
254 | } | |
aa8b683a PF |
255 | mmc_start_request(host, mrq); |
256 | } | |
257 | ||
258 | static void mmc_wait_for_req_done(struct mmc_host *host, | |
259 | struct mmc_request *mrq) | |
260 | { | |
08a7e1df AH |
261 | struct mmc_command *cmd; |
262 | ||
263 | while (1) { | |
264 | wait_for_completion(&mrq->completion); | |
265 | ||
266 | cmd = mrq->cmd; | |
d3049504 AH |
267 | if (!cmd->error || !cmd->retries || |
268 | mmc_card_removed(host->card)) | |
08a7e1df AH |
269 | break; |
270 | ||
271 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
272 | mmc_hostname(host), cmd->opcode, cmd->error); | |
273 | cmd->retries--; | |
274 | cmd->error = 0; | |
275 | host->ops->request(host, mrq); | |
276 | } | |
aa8b683a PF |
277 | } |
278 | ||
279 | /** | |
280 | * mmc_pre_req - Prepare for a new request | |
281 | * @host: MMC host to prepare command | |
282 | * @mrq: MMC request to prepare for | |
283 | * @is_first_req: true if there is no previous started request | |
284 | * that may run in parellel to this call, otherwise false | |
285 | * | |
286 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
287 | * host prepare for the new request. Preparation of a request may be | |
288 | * performed while another request is running on the host. | |
289 | */ | |
290 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
291 | bool is_first_req) | |
292 | { | |
293 | if (host->ops->pre_req) | |
294 | host->ops->pre_req(host, mrq, is_first_req); | |
295 | } | |
296 | ||
297 | /** | |
298 | * mmc_post_req - Post process a completed request | |
299 | * @host: MMC host to post process command | |
300 | * @mrq: MMC request to post process for | |
301 | * @err: Error, if non zero, clean up any resources made in pre_req | |
302 | * | |
303 | * Let the host post process a completed request. Post processing of | |
304 | * a request may be performed while another reuqest is running. | |
305 | */ | |
306 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
307 | int err) | |
308 | { | |
309 | if (host->ops->post_req) | |
310 | host->ops->post_req(host, mrq, err); | |
1da177e4 LT |
311 | } |
312 | ||
aa8b683a PF |
313 | /** |
314 | * mmc_start_req - start a non-blocking request | |
315 | * @host: MMC host to start command | |
316 | * @areq: async request to start | |
317 | * @error: out parameter returns 0 for success, otherwise non zero | |
318 | * | |
319 | * Start a new MMC custom command request for a host. | |
320 | * If there is on ongoing async request wait for completion | |
321 | * of that request and start the new one and return. | |
322 | * Does not wait for the new request to complete. | |
323 | * | |
324 | * Returns the completed request, NULL in case of none completed. | |
325 | * Wait for the an ongoing request (previoulsy started) to complete and | |
326 | * return the completed request. If there is no ongoing request, NULL | |
327 | * is returned without waiting. NULL is not an error condition. | |
328 | */ | |
329 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
330 | struct mmc_async_req *areq, int *error) | |
331 | { | |
332 | int err = 0; | |
333 | struct mmc_async_req *data = host->areq; | |
334 | ||
335 | /* Prepare a new request */ | |
336 | if (areq) | |
337 | mmc_pre_req(host, areq->mrq, !host->areq); | |
338 | ||
339 | if (host->areq) { | |
340 | mmc_wait_for_req_done(host, host->areq->mrq); | |
341 | err = host->areq->err_check(host->card, host->areq); | |
342 | if (err) { | |
7c8a2829 | 343 | /* post process the completed failed request */ |
aa8b683a PF |
344 | mmc_post_req(host, host->areq->mrq, 0); |
345 | if (areq) | |
7c8a2829 PF |
346 | /* |
347 | * Cancel the new prepared request, because | |
348 | * it can't run until the failed | |
349 | * request has been properly handled. | |
350 | */ | |
aa8b683a PF |
351 | mmc_post_req(host, areq->mrq, -EINVAL); |
352 | ||
353 | host->areq = NULL; | |
354 | goto out; | |
355 | } | |
356 | } | |
357 | ||
358 | if (areq) | |
359 | __mmc_start_req(host, areq->mrq); | |
360 | ||
361 | if (host->areq) | |
362 | mmc_post_req(host, host->areq->mrq, 0); | |
363 | ||
364 | host->areq = areq; | |
365 | out: | |
366 | if (error) | |
367 | *error = err; | |
368 | return data; | |
369 | } | |
370 | EXPORT_SYMBOL(mmc_start_req); | |
371 | ||
67a61c48 PO |
372 | /** |
373 | * mmc_wait_for_req - start a request and wait for completion | |
374 | * @host: MMC host to start command | |
375 | * @mrq: MMC request to start | |
376 | * | |
377 | * Start a new MMC custom command request for a host, and wait | |
378 | * for the command to complete. Does not attempt to parse the | |
379 | * response. | |
380 | */ | |
381 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 382 | { |
aa8b683a PF |
383 | __mmc_start_req(host, mrq); |
384 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 385 | } |
1da177e4 LT |
386 | EXPORT_SYMBOL(mmc_wait_for_req); |
387 | ||
eb0d8f13 JC |
388 | /** |
389 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
390 | * @card: the MMC card associated with the HPI transfer | |
391 | * | |
392 | * Issued High Priority Interrupt, and check for card status | |
393 | * util out-of prg-state. | |
394 | */ | |
395 | int mmc_interrupt_hpi(struct mmc_card *card) | |
396 | { | |
397 | int err; | |
398 | u32 status; | |
399 | ||
400 | BUG_ON(!card); | |
401 | ||
402 | if (!card->ext_csd.hpi_en) { | |
403 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
404 | return 1; | |
405 | } | |
406 | ||
407 | mmc_claim_host(card->host); | |
408 | err = mmc_send_status(card, &status); | |
409 | if (err) { | |
410 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
411 | goto out; | |
412 | } | |
413 | ||
414 | /* | |
415 | * If the card status is in PRG-state, we can send the HPI command. | |
416 | */ | |
417 | if (R1_CURRENT_STATE(status) == R1_STATE_PRG) { | |
418 | do { | |
419 | /* | |
420 | * We don't know when the HPI command will finish | |
421 | * processing, so we need to resend HPI until out | |
422 | * of prg-state, and keep checking the card status | |
423 | * with SEND_STATUS. If a timeout error occurs when | |
424 | * sending the HPI command, we are already out of | |
425 | * prg-state. | |
426 | */ | |
427 | err = mmc_send_hpi_cmd(card, &status); | |
428 | if (err) | |
429 | pr_debug("%s: abort HPI (%d error)\n", | |
430 | mmc_hostname(card->host), err); | |
431 | ||
432 | err = mmc_send_status(card, &status); | |
433 | if (err) | |
434 | break; | |
435 | } while (R1_CURRENT_STATE(status) == R1_STATE_PRG); | |
436 | } else | |
437 | pr_debug("%s: Left prg-state\n", mmc_hostname(card->host)); | |
438 | ||
439 | out: | |
440 | mmc_release_host(card->host); | |
441 | return err; | |
442 | } | |
443 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
444 | ||
1da177e4 LT |
445 | /** |
446 | * mmc_wait_for_cmd - start a command and wait for completion | |
447 | * @host: MMC host to start command | |
448 | * @cmd: MMC command to start | |
449 | * @retries: maximum number of retries | |
450 | * | |
451 | * Start a new MMC command for a host, and wait for the command | |
452 | * to complete. Return any error that occurred while the command | |
453 | * was executing. Do not attempt to parse the response. | |
454 | */ | |
455 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
456 | { | |
ad5fd972 | 457 | struct mmc_request mrq = {NULL}; |
1da177e4 | 458 | |
d84075c8 | 459 | WARN_ON(!host->claimed); |
1da177e4 | 460 | |
1da177e4 LT |
461 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
462 | cmd->retries = retries; | |
463 | ||
464 | mrq.cmd = cmd; | |
465 | cmd->data = NULL; | |
466 | ||
467 | mmc_wait_for_req(host, &mrq); | |
468 | ||
469 | return cmd->error; | |
470 | } | |
471 | ||
472 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
473 | ||
d773d725 RK |
474 | /** |
475 | * mmc_set_data_timeout - set the timeout for a data command | |
476 | * @data: data phase for command | |
477 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
478 | * |
479 | * Computes the data timeout parameters according to the | |
480 | * correct algorithm given the card type. | |
d773d725 | 481 | */ |
b146d26a | 482 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
483 | { |
484 | unsigned int mult; | |
485 | ||
e6f918bf PO |
486 | /* |
487 | * SDIO cards only define an upper 1 s limit on access. | |
488 | */ | |
489 | if (mmc_card_sdio(card)) { | |
490 | data->timeout_ns = 1000000000; | |
491 | data->timeout_clks = 0; | |
492 | return; | |
493 | } | |
494 | ||
d773d725 RK |
495 | /* |
496 | * SD cards use a 100 multiplier rather than 10 | |
497 | */ | |
498 | mult = mmc_card_sd(card) ? 100 : 10; | |
499 | ||
500 | /* | |
501 | * Scale up the multiplier (and therefore the timeout) by | |
502 | * the r2w factor for writes. | |
503 | */ | |
b146d26a | 504 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
505 | mult <<= card->csd.r2w_factor; |
506 | ||
507 | data->timeout_ns = card->csd.tacc_ns * mult; | |
508 | data->timeout_clks = card->csd.tacc_clks * mult; | |
509 | ||
510 | /* | |
511 | * SD cards also have an upper limit on the timeout. | |
512 | */ | |
513 | if (mmc_card_sd(card)) { | |
514 | unsigned int timeout_us, limit_us; | |
515 | ||
516 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
517 | if (mmc_host_clk_rate(card->host)) |
518 | timeout_us += data->timeout_clks * 1000 / | |
519 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 520 | |
b146d26a | 521 | if (data->flags & MMC_DATA_WRITE) |
493890e7 PO |
522 | /* |
523 | * The limit is really 250 ms, but that is | |
524 | * insufficient for some crappy cards. | |
525 | */ | |
526 | limit_us = 300000; | |
d773d725 RK |
527 | else |
528 | limit_us = 100000; | |
529 | ||
fba68bd2 PL |
530 | /* |
531 | * SDHC cards always use these fixed values. | |
532 | */ | |
533 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
534 | data->timeout_ns = limit_us * 1000; |
535 | data->timeout_clks = 0; | |
536 | } | |
537 | } | |
6de5fc9c SNX |
538 | |
539 | /* | |
540 | * Some cards require longer data read timeout than indicated in CSD. | |
541 | * Address this by setting the read timeout to a "reasonably high" | |
542 | * value. For the cards tested, 300ms has proven enough. If necessary, | |
543 | * this value can be increased if other problematic cards require this. | |
544 | */ | |
545 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
546 | data->timeout_ns = 300000000; | |
547 | data->timeout_clks = 0; | |
548 | } | |
549 | ||
c0c88871 WM |
550 | /* |
551 | * Some cards need very high timeouts if driven in SPI mode. | |
552 | * The worst observed timeout was 900ms after writing a | |
553 | * continuous stream of data until the internal logic | |
554 | * overflowed. | |
555 | */ | |
556 | if (mmc_host_is_spi(card->host)) { | |
557 | if (data->flags & MMC_DATA_WRITE) { | |
558 | if (data->timeout_ns < 1000000000) | |
559 | data->timeout_ns = 1000000000; /* 1s */ | |
560 | } else { | |
561 | if (data->timeout_ns < 100000000) | |
562 | data->timeout_ns = 100000000; /* 100ms */ | |
563 | } | |
564 | } | |
d773d725 RK |
565 | } |
566 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
567 | ||
ad3868b2 PO |
568 | /** |
569 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
570 | * @card: the MMC card associated with the data transfer | |
571 | * @sz: original transfer size | |
572 | * | |
573 | * Pads the original data size with a number of extra bytes in | |
574 | * order to avoid controller bugs and/or performance hits | |
575 | * (e.g. some controllers revert to PIO for certain sizes). | |
576 | * | |
577 | * Returns the improved size, which might be unmodified. | |
578 | * | |
579 | * Note that this function is only relevant when issuing a | |
580 | * single scatter gather entry. | |
581 | */ | |
582 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
583 | { | |
584 | /* | |
585 | * FIXME: We don't have a system for the controller to tell | |
586 | * the core about its problems yet, so for now we just 32-bit | |
587 | * align the size. | |
588 | */ | |
589 | sz = ((sz + 3) / 4) * 4; | |
590 | ||
591 | return sz; | |
592 | } | |
593 | EXPORT_SYMBOL(mmc_align_data_size); | |
594 | ||
8ea926b2 AH |
595 | /** |
596 | * mmc_host_enable - enable a host. | |
597 | * @host: mmc host to enable | |
598 | * | |
599 | * Hosts that support power saving can use the 'enable' and 'disable' | |
600 | * methods to exit and enter power saving states. For more information | |
601 | * see comments for struct mmc_host_ops. | |
602 | */ | |
603 | int mmc_host_enable(struct mmc_host *host) | |
604 | { | |
605 | if (!(host->caps & MMC_CAP_DISABLE)) | |
606 | return 0; | |
607 | ||
608 | if (host->en_dis_recurs) | |
609 | return 0; | |
610 | ||
611 | if (host->nesting_cnt++) | |
612 | return 0; | |
613 | ||
614 | cancel_delayed_work_sync(&host->disable); | |
615 | ||
616 | if (host->enabled) | |
617 | return 0; | |
618 | ||
619 | if (host->ops->enable) { | |
620 | int err; | |
621 | ||
622 | host->en_dis_recurs = 1; | |
623 | err = host->ops->enable(host); | |
624 | host->en_dis_recurs = 0; | |
625 | ||
626 | if (err) { | |
627 | pr_debug("%s: enable error %d\n", | |
628 | mmc_hostname(host), err); | |
629 | return err; | |
630 | } | |
631 | } | |
632 | host->enabled = 1; | |
633 | return 0; | |
634 | } | |
635 | EXPORT_SYMBOL(mmc_host_enable); | |
636 | ||
637 | static int mmc_host_do_disable(struct mmc_host *host, int lazy) | |
638 | { | |
639 | if (host->ops->disable) { | |
640 | int err; | |
641 | ||
642 | host->en_dis_recurs = 1; | |
643 | err = host->ops->disable(host, lazy); | |
644 | host->en_dis_recurs = 0; | |
645 | ||
646 | if (err < 0) { | |
647 | pr_debug("%s: disable error %d\n", | |
648 | mmc_hostname(host), err); | |
649 | return err; | |
650 | } | |
651 | if (err > 0) { | |
652 | unsigned long delay = msecs_to_jiffies(err); | |
653 | ||
654 | mmc_schedule_delayed_work(&host->disable, delay); | |
655 | } | |
656 | } | |
657 | host->enabled = 0; | |
658 | return 0; | |
659 | } | |
660 | ||
661 | /** | |
662 | * mmc_host_disable - disable a host. | |
663 | * @host: mmc host to disable | |
664 | * | |
665 | * Hosts that support power saving can use the 'enable' and 'disable' | |
666 | * methods to exit and enter power saving states. For more information | |
667 | * see comments for struct mmc_host_ops. | |
668 | */ | |
669 | int mmc_host_disable(struct mmc_host *host) | |
670 | { | |
671 | int err; | |
672 | ||
673 | if (!(host->caps & MMC_CAP_DISABLE)) | |
674 | return 0; | |
675 | ||
676 | if (host->en_dis_recurs) | |
677 | return 0; | |
678 | ||
679 | if (--host->nesting_cnt) | |
680 | return 0; | |
681 | ||
682 | if (!host->enabled) | |
683 | return 0; | |
684 | ||
685 | err = mmc_host_do_disable(host, 0); | |
686 | return err; | |
687 | } | |
688 | EXPORT_SYMBOL(mmc_host_disable); | |
689 | ||
1da177e4 | 690 | /** |
2342f332 | 691 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 692 | * @host: mmc host to claim |
2342f332 | 693 | * @abort: whether or not the operation should be aborted |
1da177e4 | 694 | * |
2342f332 NP |
695 | * Claim a host for a set of operations. If @abort is non null and |
696 | * dereference a non-zero value then this will return prematurely with | |
697 | * that non-zero value without acquiring the lock. Returns zero | |
698 | * with the lock held otherwise. | |
1da177e4 | 699 | */ |
2342f332 | 700 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
701 | { |
702 | DECLARE_WAITQUEUE(wait, current); | |
703 | unsigned long flags; | |
2342f332 | 704 | int stop; |
1da177e4 | 705 | |
cf795bfb PO |
706 | might_sleep(); |
707 | ||
1da177e4 LT |
708 | add_wait_queue(&host->wq, &wait); |
709 | spin_lock_irqsave(&host->lock, flags); | |
710 | while (1) { | |
711 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 712 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 713 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
714 | break; |
715 | spin_unlock_irqrestore(&host->lock, flags); | |
716 | schedule(); | |
717 | spin_lock_irqsave(&host->lock, flags); | |
718 | } | |
719 | set_current_state(TASK_RUNNING); | |
319a3f14 | 720 | if (!stop) { |
2342f332 | 721 | host->claimed = 1; |
319a3f14 AH |
722 | host->claimer = current; |
723 | host->claim_cnt += 1; | |
724 | } else | |
2342f332 | 725 | wake_up(&host->wq); |
1da177e4 LT |
726 | spin_unlock_irqrestore(&host->lock, flags); |
727 | remove_wait_queue(&host->wq, &wait); | |
8ea926b2 AH |
728 | if (!stop) |
729 | mmc_host_enable(host); | |
2342f332 | 730 | return stop; |
1da177e4 LT |
731 | } |
732 | ||
2342f332 | 733 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 734 | |
319a3f14 AH |
735 | /** |
736 | * mmc_try_claim_host - try exclusively to claim a host | |
737 | * @host: mmc host to claim | |
738 | * | |
739 | * Returns %1 if the host is claimed, %0 otherwise. | |
740 | */ | |
741 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
742 | { |
743 | int claimed_host = 0; | |
744 | unsigned long flags; | |
745 | ||
746 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 747 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 748 | host->claimed = 1; |
319a3f14 AH |
749 | host->claimer = current; |
750 | host->claim_cnt += 1; | |
8ea926b2 AH |
751 | claimed_host = 1; |
752 | } | |
753 | spin_unlock_irqrestore(&host->lock, flags); | |
754 | return claimed_host; | |
755 | } | |
319a3f14 | 756 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 757 | |
ab1efd27 UH |
758 | /** |
759 | * mmc_do_release_host - release a claimed host | |
760 | * @host: mmc host to release | |
761 | * | |
762 | * If you successfully claimed a host, this function will | |
763 | * release it again. | |
764 | */ | |
765 | void mmc_do_release_host(struct mmc_host *host) | |
8ea926b2 AH |
766 | { |
767 | unsigned long flags; | |
768 | ||
769 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 AH |
770 | if (--host->claim_cnt) { |
771 | /* Release for nested claim */ | |
772 | spin_unlock_irqrestore(&host->lock, flags); | |
773 | } else { | |
774 | host->claimed = 0; | |
775 | host->claimer = NULL; | |
776 | spin_unlock_irqrestore(&host->lock, flags); | |
777 | wake_up(&host->wq); | |
778 | } | |
8ea926b2 | 779 | } |
ab1efd27 | 780 | EXPORT_SYMBOL(mmc_do_release_host); |
8ea926b2 AH |
781 | |
782 | void mmc_host_deeper_disable(struct work_struct *work) | |
783 | { | |
784 | struct mmc_host *host = | |
785 | container_of(work, struct mmc_host, disable.work); | |
786 | ||
787 | /* If the host is claimed then we do not want to disable it anymore */ | |
788 | if (!mmc_try_claim_host(host)) | |
789 | return; | |
790 | mmc_host_do_disable(host, 1); | |
791 | mmc_do_release_host(host); | |
792 | } | |
793 | ||
794 | /** | |
795 | * mmc_host_lazy_disable - lazily disable a host. | |
796 | * @host: mmc host to disable | |
797 | * | |
798 | * Hosts that support power saving can use the 'enable' and 'disable' | |
799 | * methods to exit and enter power saving states. For more information | |
800 | * see comments for struct mmc_host_ops. | |
801 | */ | |
802 | int mmc_host_lazy_disable(struct mmc_host *host) | |
803 | { | |
804 | if (!(host->caps & MMC_CAP_DISABLE)) | |
805 | return 0; | |
806 | ||
807 | if (host->en_dis_recurs) | |
808 | return 0; | |
809 | ||
810 | if (--host->nesting_cnt) | |
811 | return 0; | |
812 | ||
813 | if (!host->enabled) | |
814 | return 0; | |
815 | ||
816 | if (host->disable_delay) { | |
817 | mmc_schedule_delayed_work(&host->disable, | |
818 | msecs_to_jiffies(host->disable_delay)); | |
819 | return 0; | |
820 | } else | |
821 | return mmc_host_do_disable(host, 1); | |
822 | } | |
823 | EXPORT_SYMBOL(mmc_host_lazy_disable); | |
824 | ||
1da177e4 LT |
825 | /** |
826 | * mmc_release_host - release a host | |
827 | * @host: mmc host to release | |
828 | * | |
829 | * Release a MMC host, allowing others to claim the host | |
830 | * for their operations. | |
831 | */ | |
832 | void mmc_release_host(struct mmc_host *host) | |
833 | { | |
d84075c8 | 834 | WARN_ON(!host->claimed); |
1da177e4 | 835 | |
8ea926b2 | 836 | mmc_host_lazy_disable(host); |
1da177e4 | 837 | |
8ea926b2 | 838 | mmc_do_release_host(host); |
1da177e4 LT |
839 | } |
840 | ||
841 | EXPORT_SYMBOL(mmc_release_host); | |
842 | ||
7ea239d9 PO |
843 | /* |
844 | * Internal function that does the actual ios call to the host driver, | |
845 | * optionally printing some debug output. | |
846 | */ | |
920e70c5 RK |
847 | static inline void mmc_set_ios(struct mmc_host *host) |
848 | { | |
849 | struct mmc_ios *ios = &host->ios; | |
850 | ||
cd9277c0 PO |
851 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
852 | "width %u timing %u\n", | |
920e70c5 RK |
853 | mmc_hostname(host), ios->clock, ios->bus_mode, |
854 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 855 | ios->bus_width, ios->timing); |
fba68bd2 | 856 | |
04566831 LW |
857 | if (ios->clock > 0) |
858 | mmc_set_ungated(host); | |
920e70c5 RK |
859 | host->ops->set_ios(host, ios); |
860 | } | |
861 | ||
7ea239d9 PO |
862 | /* |
863 | * Control chip select pin on a host. | |
864 | */ | |
da7fbe58 | 865 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 866 | { |
778e277c | 867 | mmc_host_clk_hold(host); |
da7fbe58 PO |
868 | host->ios.chip_select = mode; |
869 | mmc_set_ios(host); | |
778e277c | 870 | mmc_host_clk_release(host); |
1da177e4 LT |
871 | } |
872 | ||
7ea239d9 PO |
873 | /* |
874 | * Sets the host clock to the highest possible frequency that | |
875 | * is below "hz". | |
876 | */ | |
778e277c | 877 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
878 | { |
879 | WARN_ON(hz < host->f_min); | |
880 | ||
881 | if (hz > host->f_max) | |
882 | hz = host->f_max; | |
883 | ||
884 | host->ios.clock = hz; | |
885 | mmc_set_ios(host); | |
886 | } | |
887 | ||
778e277c MW |
888 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
889 | { | |
890 | mmc_host_clk_hold(host); | |
891 | __mmc_set_clock(host, hz); | |
892 | mmc_host_clk_release(host); | |
893 | } | |
894 | ||
04566831 LW |
895 | #ifdef CONFIG_MMC_CLKGATE |
896 | /* | |
897 | * This gates the clock by setting it to 0 Hz. | |
898 | */ | |
899 | void mmc_gate_clock(struct mmc_host *host) | |
900 | { | |
901 | unsigned long flags; | |
902 | ||
903 | spin_lock_irqsave(&host->clk_lock, flags); | |
904 | host->clk_old = host->ios.clock; | |
905 | host->ios.clock = 0; | |
906 | host->clk_gated = true; | |
907 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
908 | mmc_set_ios(host); | |
909 | } | |
910 | ||
911 | /* | |
912 | * This restores the clock from gating by using the cached | |
913 | * clock value. | |
914 | */ | |
915 | void mmc_ungate_clock(struct mmc_host *host) | |
916 | { | |
917 | /* | |
918 | * We should previously have gated the clock, so the clock shall | |
919 | * be 0 here! The clock may however be 0 during initialization, | |
920 | * when some request operations are performed before setting | |
921 | * the frequency. When ungate is requested in that situation | |
922 | * we just ignore the call. | |
923 | */ | |
924 | if (host->clk_old) { | |
925 | BUG_ON(host->ios.clock); | |
926 | /* This call will also set host->clk_gated to false */ | |
778e277c | 927 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
928 | } |
929 | } | |
930 | ||
931 | void mmc_set_ungated(struct mmc_host *host) | |
932 | { | |
933 | unsigned long flags; | |
934 | ||
935 | /* | |
936 | * We've been given a new frequency while the clock is gated, | |
937 | * so make sure we regard this as ungating it. | |
938 | */ | |
939 | spin_lock_irqsave(&host->clk_lock, flags); | |
940 | host->clk_gated = false; | |
941 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
942 | } | |
943 | ||
944 | #else | |
945 | void mmc_set_ungated(struct mmc_host *host) | |
946 | { | |
947 | } | |
948 | #endif | |
949 | ||
7ea239d9 PO |
950 | /* |
951 | * Change the bus mode (open drain/push-pull) of a host. | |
952 | */ | |
953 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
954 | { | |
778e277c | 955 | mmc_host_clk_hold(host); |
7ea239d9 PO |
956 | host->ios.bus_mode = mode; |
957 | mmc_set_ios(host); | |
778e277c | 958 | mmc_host_clk_release(host); |
7ea239d9 PO |
959 | } |
960 | ||
0f8d8ea6 AH |
961 | /* |
962 | * Change data bus width of a host. | |
963 | */ | |
964 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
965 | { | |
778e277c | 966 | mmc_host_clk_hold(host); |
4c4cb171 PR |
967 | host->ios.bus_width = width; |
968 | mmc_set_ios(host); | |
778e277c | 969 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
970 | } |
971 | ||
86e8286a AV |
972 | /** |
973 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
974 | * @vdd: voltage (mV) | |
975 | * @low_bits: prefer low bits in boundary cases | |
976 | * | |
977 | * This function returns the OCR bit number according to the provided @vdd | |
978 | * value. If conversion is not possible a negative errno value returned. | |
979 | * | |
980 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
981 | * on boundary voltages. For example, | |
982 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
983 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
984 | * | |
985 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
986 | */ | |
987 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
988 | { | |
989 | const int max_bit = ilog2(MMC_VDD_35_36); | |
990 | int bit; | |
991 | ||
992 | if (vdd < 1650 || vdd > 3600) | |
993 | return -EINVAL; | |
994 | ||
995 | if (vdd >= 1650 && vdd <= 1950) | |
996 | return ilog2(MMC_VDD_165_195); | |
997 | ||
998 | if (low_bits) | |
999 | vdd -= 1; | |
1000 | ||
1001 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1002 | bit = (vdd - 2000) / 100 + 8; | |
1003 | if (bit > max_bit) | |
1004 | return max_bit; | |
1005 | return bit; | |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1010 | * @vdd_min: minimum voltage value (mV) | |
1011 | * @vdd_max: maximum voltage value (mV) | |
1012 | * | |
1013 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1014 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1015 | * | |
1016 | * Notes wrt boundary cases: | |
1017 | * This function sets the OCR bits for all boundary voltages, for example | |
1018 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1019 | * MMC_VDD_34_35 mask. | |
1020 | */ | |
1021 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1022 | { | |
1023 | u32 mask = 0; | |
1024 | ||
1025 | if (vdd_max < vdd_min) | |
1026 | return 0; | |
1027 | ||
1028 | /* Prefer high bits for the boundary vdd_max values. */ | |
1029 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1030 | if (vdd_max < 0) | |
1031 | return 0; | |
1032 | ||
1033 | /* Prefer low bits for the boundary vdd_min values. */ | |
1034 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1035 | if (vdd_min < 0) | |
1036 | return 0; | |
1037 | ||
1038 | /* Fill the mask, from max bit to min bit. */ | |
1039 | while (vdd_max >= vdd_min) | |
1040 | mask |= 1 << vdd_max--; | |
1041 | ||
1042 | return mask; | |
1043 | } | |
1044 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1045 | ||
5c13941a DB |
1046 | #ifdef CONFIG_REGULATOR |
1047 | ||
1048 | /** | |
1049 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1050 | * @supply: regulator to use | |
1051 | * | |
1052 | * This returns either a negative errno, or a mask of voltages that | |
1053 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1054 | * regulator. This would normally be called before registering the | |
1055 | * MMC host adapter. | |
1056 | */ | |
1057 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1058 | { | |
1059 | int result = 0; | |
1060 | int count; | |
1061 | int i; | |
1062 | ||
1063 | count = regulator_count_voltages(supply); | |
1064 | if (count < 0) | |
1065 | return count; | |
1066 | ||
1067 | for (i = 0; i < count; i++) { | |
1068 | int vdd_uV; | |
1069 | int vdd_mV; | |
1070 | ||
1071 | vdd_uV = regulator_list_voltage(supply, i); | |
1072 | if (vdd_uV <= 0) | |
1073 | continue; | |
1074 | ||
1075 | vdd_mV = vdd_uV / 1000; | |
1076 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1077 | } | |
1078 | ||
1079 | return result; | |
1080 | } | |
1081 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
1082 | ||
1083 | /** | |
1084 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1085 | * @mmc: the host to regulate |
5c13941a | 1086 | * @supply: regulator to use |
99fc5131 | 1087 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1088 | * |
1089 | * Returns zero on success, else negative errno. | |
1090 | * | |
1091 | * MMC host drivers may use this to enable or disable a regulator using | |
1092 | * a particular supply voltage. This would normally be called from the | |
1093 | * set_ios() method. | |
1094 | */ | |
99fc5131 LW |
1095 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1096 | struct regulator *supply, | |
1097 | unsigned short vdd_bit) | |
5c13941a DB |
1098 | { |
1099 | int result = 0; | |
1100 | int min_uV, max_uV; | |
5c13941a DB |
1101 | |
1102 | if (vdd_bit) { | |
1103 | int tmp; | |
1104 | int voltage; | |
1105 | ||
1106 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
1107 | * bits this regulator doesn't quite support ... don't | |
1108 | * be too picky, most cards and regulators are OK with | |
1109 | * a 0.1V range goof (it's a small error percentage). | |
1110 | */ | |
1111 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1112 | if (tmp == 0) { | |
1113 | min_uV = 1650 * 1000; | |
1114 | max_uV = 1950 * 1000; | |
1115 | } else { | |
1116 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1117 | max_uV = min_uV + 100 * 1000; | |
1118 | } | |
1119 | ||
1120 | /* avoid needless changes to this voltage; the regulator | |
1121 | * might not allow this operation | |
1122 | */ | |
1123 | voltage = regulator_get_voltage(supply); | |
1124 | if (voltage < 0) | |
1125 | result = voltage; | |
1126 | else if (voltage < min_uV || voltage > max_uV) | |
1127 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
1128 | else | |
1129 | result = 0; | |
1130 | ||
99fc5131 | 1131 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1132 | result = regulator_enable(supply); |
99fc5131 LW |
1133 | if (!result) |
1134 | mmc->regulator_enabled = true; | |
1135 | } | |
1136 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1137 | result = regulator_disable(supply); |
99fc5131 LW |
1138 | if (result == 0) |
1139 | mmc->regulator_enabled = false; | |
5c13941a DB |
1140 | } |
1141 | ||
99fc5131 LW |
1142 | if (result) |
1143 | dev_err(mmc_dev(mmc), | |
1144 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1145 | return result; |
1146 | } | |
1147 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
1148 | ||
99fc5131 | 1149 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1150 | |
1da177e4 LT |
1151 | /* |
1152 | * Mask off any voltages we don't support and select | |
1153 | * the lowest voltage | |
1154 | */ | |
7ea239d9 | 1155 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1156 | { |
1157 | int bit; | |
1158 | ||
1159 | ocr &= host->ocr_avail; | |
1160 | ||
1161 | bit = ffs(ocr); | |
1162 | if (bit) { | |
1163 | bit -= 1; | |
1164 | ||
63ef731a | 1165 | ocr &= 3 << bit; |
1da177e4 | 1166 | |
778e277c | 1167 | mmc_host_clk_hold(host); |
1da177e4 | 1168 | host->ios.vdd = bit; |
920e70c5 | 1169 | mmc_set_ios(host); |
778e277c | 1170 | mmc_host_clk_release(host); |
1da177e4 | 1171 | } else { |
f6e10b86 DB |
1172 | pr_warning("%s: host doesn't support card's voltages\n", |
1173 | mmc_hostname(host)); | |
1da177e4 LT |
1174 | ocr = 0; |
1175 | } | |
1176 | ||
1177 | return ocr; | |
1178 | } | |
1179 | ||
261bbd46 | 1180 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11) |
f2119df6 AN |
1181 | { |
1182 | struct mmc_command cmd = {0}; | |
1183 | int err = 0; | |
1184 | ||
1185 | BUG_ON(!host); | |
1186 | ||
1187 | /* | |
1188 | * Send CMD11 only if the request is to switch the card to | |
1189 | * 1.8V signalling. | |
1190 | */ | |
261bbd46 | 1191 | if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) { |
f2119df6 AN |
1192 | cmd.opcode = SD_SWITCH_VOLTAGE; |
1193 | cmd.arg = 0; | |
1194 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1195 | ||
1196 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1197 | if (err) | |
1198 | return err; | |
1199 | ||
1200 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1201 | return -EIO; | |
1202 | } | |
1203 | ||
1204 | host->ios.signal_voltage = signal_voltage; | |
1205 | ||
1206 | if (host->ops->start_signal_voltage_switch) | |
1207 | err = host->ops->start_signal_voltage_switch(host, &host->ios); | |
1208 | ||
1209 | return err; | |
1210 | } | |
1211 | ||
b57c43ad | 1212 | /* |
7ea239d9 | 1213 | * Select timing parameters for host. |
b57c43ad | 1214 | */ |
7ea239d9 | 1215 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1216 | { |
778e277c | 1217 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1218 | host->ios.timing = timing; |
1219 | mmc_set_ios(host); | |
778e277c | 1220 | mmc_host_clk_release(host); |
b57c43ad PO |
1221 | } |
1222 | ||
d6d50a15 AN |
1223 | /* |
1224 | * Select appropriate driver type for host. | |
1225 | */ | |
1226 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1227 | { | |
778e277c | 1228 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1229 | host->ios.drv_type = drv_type; |
1230 | mmc_set_ios(host); | |
778e277c | 1231 | mmc_host_clk_release(host); |
d6d50a15 AN |
1232 | } |
1233 | ||
a80f1627 G |
1234 | static void mmc_poweroff_notify(struct mmc_host *host) |
1235 | { | |
1236 | struct mmc_card *card; | |
1237 | unsigned int timeout; | |
1238 | unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION; | |
1239 | int err = 0; | |
1240 | ||
1241 | card = host->card; | |
1242 | ||
1243 | /* | |
1244 | * Send power notify command only if card | |
1245 | * is mmc and notify state is powered ON | |
1246 | */ | |
1247 | if (card && mmc_card_mmc(card) && | |
1248 | (card->poweroff_notify_state == MMC_POWERED_ON)) { | |
1249 | ||
1250 | if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) { | |
1251 | notify_type = EXT_CSD_POWER_OFF_SHORT; | |
1252 | timeout = card->ext_csd.generic_cmd6_time; | |
1253 | card->poweroff_notify_state = MMC_POWEROFF_SHORT; | |
1254 | } else { | |
1255 | notify_type = EXT_CSD_POWER_OFF_LONG; | |
1256 | timeout = card->ext_csd.power_off_longtime; | |
1257 | card->poweroff_notify_state = MMC_POWEROFF_LONG; | |
1258 | } | |
1259 | ||
1260 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
1261 | EXT_CSD_POWER_OFF_NOTIFICATION, | |
1262 | notify_type, timeout); | |
1263 | ||
1264 | if (err && err != -EBADMSG) | |
1265 | pr_err("Device failed to respond within %d poweroff " | |
1266 | "time. Forcefully powering down the device\n", | |
1267 | timeout); | |
1268 | ||
1269 | /* Set the card state to no notification after the poweroff */ | |
1270 | card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION; | |
1271 | } | |
1272 | } | |
1273 | ||
1da177e4 | 1274 | /* |
45f8245b RK |
1275 | * Apply power to the MMC stack. This is a two-stage process. |
1276 | * First, we enable power to the card without the clock running. | |
1277 | * We then wait a bit for the power to stabilise. Finally, | |
1278 | * enable the bus drivers and clock to the card. | |
1279 | * | |
1280 | * We must _NOT_ enable the clock prior to power stablising. | |
1281 | * | |
1282 | * If a host does all the power sequencing itself, ignore the | |
1283 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
1284 | */ |
1285 | static void mmc_power_up(struct mmc_host *host) | |
1286 | { | |
500f3564 BR |
1287 | int bit; |
1288 | ||
778e277c MW |
1289 | mmc_host_clk_hold(host); |
1290 | ||
500f3564 BR |
1291 | /* If ocr is set, we use it */ |
1292 | if (host->ocr) | |
1293 | bit = ffs(host->ocr) - 1; | |
1294 | else | |
1295 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1296 | |
1297 | host->ios.vdd = bit; | |
44669034 | 1298 | if (mmc_host_is_spi(host)) |
af517150 | 1299 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1300 | else |
af517150 | 1301 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1302 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1303 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1304 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1305 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1306 | mmc_set_ios(host); |
1da177e4 | 1307 | |
f9996aee PO |
1308 | /* |
1309 | * This delay should be sufficient to allow the power supply | |
1310 | * to reach the minimum voltage. | |
1311 | */ | |
79bccc5a | 1312 | mmc_delay(10); |
1da177e4 | 1313 | |
88ae8b86 | 1314 | host->ios.clock = host->f_init; |
8dfd0374 | 1315 | |
1da177e4 | 1316 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1317 | mmc_set_ios(host); |
1da177e4 | 1318 | |
f9996aee PO |
1319 | /* |
1320 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1321 | * time required to reach a stable voltage. | |
1322 | */ | |
79bccc5a | 1323 | mmc_delay(10); |
778e277c MW |
1324 | |
1325 | mmc_host_clk_release(host); | |
1da177e4 LT |
1326 | } |
1327 | ||
7f7e4129 | 1328 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1329 | { |
778e277c MW |
1330 | mmc_host_clk_hold(host); |
1331 | ||
1da177e4 LT |
1332 | host->ios.clock = 0; |
1333 | host->ios.vdd = 0; | |
b33d46c3 | 1334 | |
a80f1627 | 1335 | mmc_poweroff_notify(host); |
bec8726a | 1336 | |
b33d46c3 UH |
1337 | /* |
1338 | * Reset ocr mask to be the highest possible voltage supported for | |
1339 | * this mmc host. This value will be used at next power up. | |
1340 | */ | |
1341 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1342 | ||
af517150 DB |
1343 | if (!mmc_host_is_spi(host)) { |
1344 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1345 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1346 | } | |
1da177e4 | 1347 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1348 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1349 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1350 | mmc_set_ios(host); |
778e277c | 1351 | |
041beb1d DD |
1352 | /* |
1353 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1354 | * XO-1.5, require a short delay after poweroff before the card | |
1355 | * can be successfully turned on again. | |
1356 | */ | |
1357 | mmc_delay(1); | |
1358 | ||
778e277c | 1359 | mmc_host_clk_release(host); |
1da177e4 LT |
1360 | } |
1361 | ||
39361851 AB |
1362 | /* |
1363 | * Cleanup when the last reference to the bus operator is dropped. | |
1364 | */ | |
261172fd | 1365 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1366 | { |
1367 | BUG_ON(!host); | |
1368 | BUG_ON(host->bus_refs); | |
1369 | BUG_ON(!host->bus_dead); | |
1370 | ||
1371 | host->bus_ops = NULL; | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Increase reference count of bus operator | |
1376 | */ | |
1377 | static inline void mmc_bus_get(struct mmc_host *host) | |
1378 | { | |
1379 | unsigned long flags; | |
1380 | ||
1381 | spin_lock_irqsave(&host->lock, flags); | |
1382 | host->bus_refs++; | |
1383 | spin_unlock_irqrestore(&host->lock, flags); | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * Decrease reference count of bus operator and free it if | |
1388 | * it is the last reference. | |
1389 | */ | |
1390 | static inline void mmc_bus_put(struct mmc_host *host) | |
1391 | { | |
1392 | unsigned long flags; | |
1393 | ||
1394 | spin_lock_irqsave(&host->lock, flags); | |
1395 | host->bus_refs--; | |
1396 | if ((host->bus_refs == 0) && host->bus_ops) | |
1397 | __mmc_release_bus(host); | |
1398 | spin_unlock_irqrestore(&host->lock, flags); | |
1399 | } | |
1400 | ||
1da177e4 | 1401 | /* |
7ea239d9 PO |
1402 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1403 | * host at any given time. | |
1da177e4 | 1404 | */ |
7ea239d9 | 1405 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1406 | { |
7ea239d9 | 1407 | unsigned long flags; |
e45a1bd2 | 1408 | |
7ea239d9 PO |
1409 | BUG_ON(!host); |
1410 | BUG_ON(!ops); | |
b855885e | 1411 | |
d84075c8 | 1412 | WARN_ON(!host->claimed); |
bce40a36 | 1413 | |
7ea239d9 | 1414 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1415 | |
7ea239d9 PO |
1416 | BUG_ON(host->bus_ops); |
1417 | BUG_ON(host->bus_refs); | |
b57c43ad | 1418 | |
7ea239d9 PO |
1419 | host->bus_ops = ops; |
1420 | host->bus_refs = 1; | |
1421 | host->bus_dead = 0; | |
b57c43ad | 1422 | |
7ea239d9 | 1423 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1424 | } |
1425 | ||
7ea239d9 | 1426 | /* |
7f7e4129 | 1427 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1428 | */ |
1429 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1430 | { |
7ea239d9 | 1431 | unsigned long flags; |
7ccd266e | 1432 | |
7ea239d9 | 1433 | BUG_ON(!host); |
7ccd266e | 1434 | |
d84075c8 PO |
1435 | WARN_ON(!host->claimed); |
1436 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1437 | |
7ea239d9 | 1438 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1439 | |
7ea239d9 | 1440 | host->bus_dead = 1; |
7ccd266e | 1441 | |
7ea239d9 | 1442 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1443 | |
7ea239d9 | 1444 | mmc_bus_put(host); |
1da177e4 LT |
1445 | } |
1446 | ||
1da177e4 LT |
1447 | /** |
1448 | * mmc_detect_change - process change of state on a MMC socket | |
1449 | * @host: host which changed state. | |
8dc00335 | 1450 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1451 | * |
67a61c48 PO |
1452 | * MMC drivers should call this when they detect a card has been |
1453 | * inserted or removed. The MMC layer will confirm that any | |
1454 | * present card is still functional, and initialize any newly | |
1455 | * inserted. | |
1da177e4 | 1456 | */ |
8dc00335 | 1457 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1458 | { |
3b91e550 | 1459 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1460 | unsigned long flags; |
01f41ec7 | 1461 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1462 | WARN_ON(host->removed); |
01f41ec7 | 1463 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 1464 | #endif |
d3049504 | 1465 | host->detect_change = 1; |
c4028958 | 1466 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1467 | } |
1468 | ||
1469 | EXPORT_SYMBOL(mmc_detect_change); | |
1470 | ||
dfe86cba AH |
1471 | void mmc_init_erase(struct mmc_card *card) |
1472 | { | |
1473 | unsigned int sz; | |
1474 | ||
1475 | if (is_power_of_2(card->erase_size)) | |
1476 | card->erase_shift = ffs(card->erase_size) - 1; | |
1477 | else | |
1478 | card->erase_shift = 0; | |
1479 | ||
1480 | /* | |
1481 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1482 | * card. That is not desirable because it can take a long time | |
1483 | * (minutes) potentially delaying more important I/O, and also the | |
1484 | * timeout calculations become increasingly hugely over-estimated. | |
1485 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1486 | * to that size and alignment. | |
1487 | * | |
1488 | * For SD cards that define Allocation Unit size, limit erases to one | |
1489 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1490 | * Erase Size, whether it is switched on or not, limit to that size. | |
1491 | * Otherwise just have a stab at a good value. For modern cards it | |
1492 | * will end up being 4MiB. Note that if the value is too small, it | |
1493 | * can end up taking longer to erase. | |
1494 | */ | |
1495 | if (mmc_card_sd(card) && card->ssr.au) { | |
1496 | card->pref_erase = card->ssr.au; | |
1497 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1498 | } else if (card->ext_csd.hc_erase_size) { | |
1499 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1500 | } else { | |
1501 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1502 | if (sz < 128) | |
1503 | card->pref_erase = 512 * 1024 / 512; | |
1504 | else if (sz < 512) | |
1505 | card->pref_erase = 1024 * 1024 / 512; | |
1506 | else if (sz < 1024) | |
1507 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1508 | else | |
1509 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1510 | if (card->pref_erase < card->erase_size) | |
1511 | card->pref_erase = card->erase_size; | |
1512 | else { | |
1513 | sz = card->pref_erase % card->erase_size; | |
1514 | if (sz) | |
1515 | card->pref_erase += card->erase_size - sz; | |
1516 | } | |
1517 | } | |
1518 | } | |
1519 | ||
eaa02f75 AW |
1520 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1521 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1522 | { |
1523 | unsigned int erase_timeout; | |
1524 | ||
1525 | if (card->ext_csd.erase_group_def & 1) { | |
1526 | /* High Capacity Erase Group Size uses HC timeouts */ | |
1527 | if (arg == MMC_TRIM_ARG) | |
1528 | erase_timeout = card->ext_csd.trim_timeout; | |
1529 | else | |
1530 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1531 | } else { | |
1532 | /* CSD Erase Group Size uses write timeout */ | |
1533 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1534 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1535 | unsigned int timeout_us; | |
1536 | ||
1537 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1538 | if (card->csd.tacc_ns < 1000000) | |
1539 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1540 | else | |
1541 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1542 | ||
1543 | /* | |
1544 | * ios.clock is only a target. The real clock rate might be | |
1545 | * less but not that much less, so fudge it by multiplying by 2. | |
1546 | */ | |
1547 | timeout_clks <<= 1; | |
1548 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1549 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1550 | |
1551 | erase_timeout = timeout_us / 1000; | |
1552 | ||
1553 | /* | |
1554 | * Theoretically, the calculation could underflow so round up | |
1555 | * to 1ms in that case. | |
1556 | */ | |
1557 | if (!erase_timeout) | |
1558 | erase_timeout = 1; | |
1559 | } | |
1560 | ||
1561 | /* Multiplier for secure operations */ | |
1562 | if (arg & MMC_SECURE_ARGS) { | |
1563 | if (arg == MMC_SECURE_ERASE_ARG) | |
1564 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1565 | else | |
1566 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1567 | } | |
1568 | ||
1569 | erase_timeout *= qty; | |
1570 | ||
1571 | /* | |
1572 | * Ensure at least a 1 second timeout for SPI as per | |
1573 | * 'mmc_set_data_timeout()' | |
1574 | */ | |
1575 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1576 | erase_timeout = 1000; | |
1577 | ||
eaa02f75 | 1578 | return erase_timeout; |
dfe86cba AH |
1579 | } |
1580 | ||
eaa02f75 AW |
1581 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1582 | unsigned int arg, | |
1583 | unsigned int qty) | |
dfe86cba | 1584 | { |
eaa02f75 AW |
1585 | unsigned int erase_timeout; |
1586 | ||
dfe86cba AH |
1587 | if (card->ssr.erase_timeout) { |
1588 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1589 | erase_timeout = card->ssr.erase_timeout * qty + |
1590 | card->ssr.erase_offset; | |
dfe86cba AH |
1591 | } else { |
1592 | /* | |
1593 | * Erase timeout not specified in SD Status Register (SSR) so | |
1594 | * use 250ms per write block. | |
1595 | */ | |
eaa02f75 | 1596 | erase_timeout = 250 * qty; |
dfe86cba AH |
1597 | } |
1598 | ||
1599 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1600 | if (erase_timeout < 1000) |
1601 | erase_timeout = 1000; | |
1602 | ||
1603 | return erase_timeout; | |
dfe86cba AH |
1604 | } |
1605 | ||
eaa02f75 AW |
1606 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1607 | unsigned int arg, | |
1608 | unsigned int qty) | |
dfe86cba AH |
1609 | { |
1610 | if (mmc_card_sd(card)) | |
eaa02f75 | 1611 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1612 | else |
eaa02f75 | 1613 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1614 | } |
1615 | ||
1616 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1617 | unsigned int to, unsigned int arg) | |
1618 | { | |
1278dba1 | 1619 | struct mmc_command cmd = {0}; |
dfe86cba AH |
1620 | unsigned int qty = 0; |
1621 | int err; | |
1622 | ||
1623 | /* | |
1624 | * qty is used to calculate the erase timeout which depends on how many | |
1625 | * erase groups (or allocation units in SD terminology) are affected. | |
1626 | * We count erasing part of an erase group as one erase group. | |
1627 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1628 | * erase group size is almost certainly also power of 2, but it does not | |
1629 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1630 | * division in that case. SD may not specify an allocation unit size, | |
1631 | * in which case the timeout is based on the number of write blocks. | |
1632 | * | |
1633 | * Note that the timeout for secure trim 2 will only be correct if the | |
1634 | * number of erase groups specified is the same as the total of all | |
1635 | * preceding secure trim 1 commands. Since the power may have been | |
1636 | * lost since the secure trim 1 commands occurred, it is generally | |
1637 | * impossible to calculate the secure trim 2 timeout correctly. | |
1638 | */ | |
1639 | if (card->erase_shift) | |
1640 | qty += ((to >> card->erase_shift) - | |
1641 | (from >> card->erase_shift)) + 1; | |
1642 | else if (mmc_card_sd(card)) | |
1643 | qty += to - from + 1; | |
1644 | else | |
1645 | qty += ((to / card->erase_size) - | |
1646 | (from / card->erase_size)) + 1; | |
1647 | ||
1648 | if (!mmc_card_blockaddr(card)) { | |
1649 | from <<= 9; | |
1650 | to <<= 9; | |
1651 | } | |
1652 | ||
dfe86cba AH |
1653 | if (mmc_card_sd(card)) |
1654 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1655 | else | |
1656 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1657 | cmd.arg = from; | |
1658 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1659 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1660 | if (err) { | |
a3c76eb9 | 1661 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 1662 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 1663 | err = -EIO; |
dfe86cba AH |
1664 | goto out; |
1665 | } | |
1666 | ||
1667 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1668 | if (mmc_card_sd(card)) | |
1669 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1670 | else | |
1671 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1672 | cmd.arg = to; | |
1673 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1674 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1675 | if (err) { | |
a3c76eb9 | 1676 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 1677 | err, cmd.resp[0]); |
67716327 | 1678 | err = -EIO; |
dfe86cba AH |
1679 | goto out; |
1680 | } | |
1681 | ||
1682 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1683 | cmd.opcode = MMC_ERASE; | |
1684 | cmd.arg = arg; | |
1685 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1686 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1687 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1688 | if (err) { | |
a3c76eb9 | 1689 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
1690 | err, cmd.resp[0]); |
1691 | err = -EIO; | |
1692 | goto out; | |
1693 | } | |
1694 | ||
1695 | if (mmc_host_is_spi(card->host)) | |
1696 | goto out; | |
1697 | ||
1698 | do { | |
1699 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1700 | cmd.opcode = MMC_SEND_STATUS; | |
1701 | cmd.arg = card->rca << 16; | |
1702 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1703 | /* Do not retry else we can't see errors */ | |
1704 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1705 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 1706 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
1707 | err, cmd.resp[0]); |
1708 | err = -EIO; | |
1709 | goto out; | |
1710 | } | |
1711 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
7435bb79 | 1712 | R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG); |
dfe86cba AH |
1713 | out: |
1714 | return err; | |
1715 | } | |
1716 | ||
1717 | /** | |
1718 | * mmc_erase - erase sectors. | |
1719 | * @card: card to erase | |
1720 | * @from: first sector to erase | |
1721 | * @nr: number of sectors to erase | |
1722 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1723 | * | |
1724 | * Caller must claim host before calling this function. | |
1725 | */ | |
1726 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1727 | unsigned int arg) | |
1728 | { | |
1729 | unsigned int rem, to = from + nr; | |
1730 | ||
1731 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1732 | !(card->csd.cmdclass & CCC_ERASE)) | |
1733 | return -EOPNOTSUPP; | |
1734 | ||
1735 | if (!card->erase_size) | |
1736 | return -EOPNOTSUPP; | |
1737 | ||
1738 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1739 | return -EOPNOTSUPP; | |
1740 | ||
1741 | if ((arg & MMC_SECURE_ARGS) && | |
1742 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1743 | return -EOPNOTSUPP; | |
1744 | ||
1745 | if ((arg & MMC_TRIM_ARGS) && | |
1746 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1747 | return -EOPNOTSUPP; | |
1748 | ||
1749 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1750 | if (from % card->erase_size || nr % card->erase_size) | |
1751 | return -EINVAL; | |
1752 | } | |
1753 | ||
1754 | if (arg == MMC_ERASE_ARG) { | |
1755 | rem = from % card->erase_size; | |
1756 | if (rem) { | |
1757 | rem = card->erase_size - rem; | |
1758 | from += rem; | |
1759 | if (nr > rem) | |
1760 | nr -= rem; | |
1761 | else | |
1762 | return 0; | |
1763 | } | |
1764 | rem = nr % card->erase_size; | |
1765 | if (rem) | |
1766 | nr -= rem; | |
1767 | } | |
1768 | ||
1769 | if (nr == 0) | |
1770 | return 0; | |
1771 | ||
1772 | to = from + nr; | |
1773 | ||
1774 | if (to <= from) | |
1775 | return -EINVAL; | |
1776 | ||
1777 | /* 'from' and 'to' are inclusive */ | |
1778 | to -= 1; | |
1779 | ||
1780 | return mmc_do_erase(card, from, to, arg); | |
1781 | } | |
1782 | EXPORT_SYMBOL(mmc_erase); | |
1783 | ||
1784 | int mmc_can_erase(struct mmc_card *card) | |
1785 | { | |
1786 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1787 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1788 | return 1; | |
1789 | return 0; | |
1790 | } | |
1791 | EXPORT_SYMBOL(mmc_can_erase); | |
1792 | ||
1793 | int mmc_can_trim(struct mmc_card *card) | |
1794 | { | |
1795 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
1796 | return 1; | |
b3bf9153 KP |
1797 | if (mmc_can_discard(card)) |
1798 | return 1; | |
dfe86cba AH |
1799 | return 0; |
1800 | } | |
1801 | EXPORT_SYMBOL(mmc_can_trim); | |
1802 | ||
b3bf9153 KP |
1803 | int mmc_can_discard(struct mmc_card *card) |
1804 | { | |
1805 | /* | |
1806 | * As there's no way to detect the discard support bit at v4.5 | |
1807 | * use the s/w feature support filed. | |
1808 | */ | |
1809 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
1810 | return 1; | |
1811 | return 0; | |
1812 | } | |
1813 | EXPORT_SYMBOL(mmc_can_discard); | |
1814 | ||
d9ddd629 KP |
1815 | int mmc_can_sanitize(struct mmc_card *card) |
1816 | { | |
1817 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) | |
1818 | return 1; | |
1819 | return 0; | |
1820 | } | |
1821 | EXPORT_SYMBOL(mmc_can_sanitize); | |
1822 | ||
dfe86cba AH |
1823 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
1824 | { | |
1825 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
1826 | return 1; | |
1827 | return 0; | |
1828 | } | |
1829 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
1830 | ||
1831 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
1832 | unsigned int nr) | |
1833 | { | |
1834 | if (!card->erase_size) | |
1835 | return 0; | |
1836 | if (from % card->erase_size || nr % card->erase_size) | |
1837 | return 0; | |
1838 | return 1; | |
1839 | } | |
1840 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 1841 | |
e056a1b5 AH |
1842 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
1843 | unsigned int arg) | |
1844 | { | |
1845 | struct mmc_host *host = card->host; | |
1846 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
1847 | unsigned int last_timeout = 0; | |
1848 | ||
1849 | if (card->erase_shift) | |
1850 | max_qty = UINT_MAX >> card->erase_shift; | |
1851 | else if (mmc_card_sd(card)) | |
1852 | max_qty = UINT_MAX; | |
1853 | else | |
1854 | max_qty = UINT_MAX / card->erase_size; | |
1855 | ||
1856 | /* Find the largest qty with an OK timeout */ | |
1857 | do { | |
1858 | y = 0; | |
1859 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
1860 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
1861 | if (timeout > host->max_discard_to) | |
1862 | break; | |
1863 | if (timeout < last_timeout) | |
1864 | break; | |
1865 | last_timeout = timeout; | |
1866 | y = x; | |
1867 | } | |
1868 | qty += y; | |
1869 | } while (y); | |
1870 | ||
1871 | if (!qty) | |
1872 | return 0; | |
1873 | ||
1874 | if (qty == 1) | |
1875 | return 1; | |
1876 | ||
1877 | /* Convert qty to sectors */ | |
1878 | if (card->erase_shift) | |
1879 | max_discard = --qty << card->erase_shift; | |
1880 | else if (mmc_card_sd(card)) | |
1881 | max_discard = qty; | |
1882 | else | |
1883 | max_discard = --qty * card->erase_size; | |
1884 | ||
1885 | return max_discard; | |
1886 | } | |
1887 | ||
1888 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
1889 | { | |
1890 | struct mmc_host *host = card->host; | |
1891 | unsigned int max_discard, max_trim; | |
1892 | ||
1893 | if (!host->max_discard_to) | |
1894 | return UINT_MAX; | |
1895 | ||
1896 | /* | |
1897 | * Without erase_group_def set, MMC erase timeout depends on clock | |
1898 | * frequence which can change. In that case, the best choice is | |
1899 | * just the preferred erase size. | |
1900 | */ | |
1901 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
1902 | return card->pref_erase; | |
1903 | ||
1904 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
1905 | if (mmc_can_trim(card)) { | |
1906 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
1907 | if (max_trim < max_discard) | |
1908 | max_discard = max_trim; | |
1909 | } else if (max_discard < card->erase_size) { | |
1910 | max_discard = 0; | |
1911 | } | |
1912 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
1913 | mmc_hostname(host), max_discard, host->max_discard_to); | |
1914 | return max_discard; | |
1915 | } | |
1916 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
1917 | ||
0f8d8ea6 AH |
1918 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
1919 | { | |
1278dba1 | 1920 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
1921 | |
1922 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
1923 | return 0; | |
1924 | ||
0f8d8ea6 AH |
1925 | cmd.opcode = MMC_SET_BLOCKLEN; |
1926 | cmd.arg = blocklen; | |
1927 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1928 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
1929 | } | |
1930 | EXPORT_SYMBOL(mmc_set_blocklen); | |
1931 | ||
b2499518 AH |
1932 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
1933 | { | |
1934 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
1935 | return; | |
1936 | mmc_host_clk_hold(host); | |
1937 | host->ops->hw_reset(host); | |
1938 | mmc_host_clk_release(host); | |
1939 | } | |
1940 | ||
1941 | int mmc_can_reset(struct mmc_card *card) | |
1942 | { | |
1943 | u8 rst_n_function; | |
1944 | ||
1945 | if (!mmc_card_mmc(card)) | |
1946 | return 0; | |
1947 | rst_n_function = card->ext_csd.rst_n_function; | |
1948 | if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED) | |
1949 | return 0; | |
1950 | return 1; | |
1951 | } | |
1952 | EXPORT_SYMBOL(mmc_can_reset); | |
1953 | ||
1954 | static int mmc_do_hw_reset(struct mmc_host *host, int check) | |
1955 | { | |
1956 | struct mmc_card *card = host->card; | |
1957 | ||
1958 | if (!host->bus_ops->power_restore) | |
1959 | return -EOPNOTSUPP; | |
1960 | ||
1961 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
1962 | return -EOPNOTSUPP; | |
1963 | ||
1964 | if (!card) | |
1965 | return -EINVAL; | |
1966 | ||
1967 | if (!mmc_can_reset(card)) | |
1968 | return -EOPNOTSUPP; | |
1969 | ||
1970 | mmc_host_clk_hold(host); | |
1971 | mmc_set_clock(host, host->f_init); | |
1972 | ||
1973 | host->ops->hw_reset(host); | |
1974 | ||
1975 | /* If the reset has happened, then a status command will fail */ | |
1976 | if (check) { | |
1977 | struct mmc_command cmd = {0}; | |
1978 | int err; | |
1979 | ||
1980 | cmd.opcode = MMC_SEND_STATUS; | |
1981 | if (!mmc_host_is_spi(card->host)) | |
1982 | cmd.arg = card->rca << 16; | |
1983 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
1984 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1985 | if (!err) { | |
1986 | mmc_host_clk_release(host); | |
1987 | return -ENOSYS; | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR); | |
1992 | if (mmc_host_is_spi(host)) { | |
1993 | host->ios.chip_select = MMC_CS_HIGH; | |
1994 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1995 | } else { | |
1996 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1997 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1998 | } | |
1999 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
2000 | host->ios.timing = MMC_TIMING_LEGACY; | |
2001 | mmc_set_ios(host); | |
2002 | ||
2003 | mmc_host_clk_release(host); | |
2004 | ||
2005 | return host->bus_ops->power_restore(host); | |
2006 | } | |
2007 | ||
2008 | int mmc_hw_reset(struct mmc_host *host) | |
2009 | { | |
2010 | return mmc_do_hw_reset(host, 0); | |
2011 | } | |
2012 | EXPORT_SYMBOL(mmc_hw_reset); | |
2013 | ||
2014 | int mmc_hw_reset_check(struct mmc_host *host) | |
2015 | { | |
2016 | return mmc_do_hw_reset(host, 1); | |
2017 | } | |
2018 | EXPORT_SYMBOL(mmc_hw_reset_check); | |
2019 | ||
807e8e40 AR |
2020 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2021 | { | |
2022 | host->f_init = freq; | |
2023 | ||
2024 | #ifdef CONFIG_MMC_DEBUG | |
2025 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2026 | mmc_hostname(host), __func__, host->f_init); | |
2027 | #endif | |
2028 | mmc_power_up(host); | |
2f94e55a | 2029 | |
b2499518 AH |
2030 | /* |
2031 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2032 | * do a hardware reset if possible. | |
2033 | */ | |
2034 | mmc_hw_reset_for_init(host); | |
2035 | ||
2f94e55a PR |
2036 | /* |
2037 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2038 | * if the card is being re-initialized, just send it. CMD52 | |
2039 | * should be ignored by SD/eMMC cards. | |
2040 | */ | |
807e8e40 AR |
2041 | sdio_reset(host); |
2042 | mmc_go_idle(host); | |
2043 | ||
2044 | mmc_send_if_cond(host, host->ocr_avail); | |
2045 | ||
2046 | /* Order's important: probe SDIO, then SD, then MMC */ | |
2047 | if (!mmc_attach_sdio(host)) | |
2048 | return 0; | |
2049 | if (!mmc_attach_sd(host)) | |
2050 | return 0; | |
2051 | if (!mmc_attach_mmc(host)) | |
2052 | return 0; | |
2053 | ||
2054 | mmc_power_off(host); | |
2055 | return -EIO; | |
2056 | } | |
2057 | ||
d3049504 AH |
2058 | int _mmc_detect_card_removed(struct mmc_host *host) |
2059 | { | |
2060 | int ret; | |
2061 | ||
2062 | if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive) | |
2063 | return 0; | |
2064 | ||
2065 | if (!host->card || mmc_card_removed(host->card)) | |
2066 | return 1; | |
2067 | ||
2068 | ret = host->bus_ops->alive(host); | |
2069 | if (ret) { | |
2070 | mmc_card_set_removed(host->card); | |
2071 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2072 | } | |
2073 | ||
2074 | return ret; | |
2075 | } | |
2076 | ||
2077 | int mmc_detect_card_removed(struct mmc_host *host) | |
2078 | { | |
2079 | struct mmc_card *card = host->card; | |
2080 | ||
2081 | WARN_ON(!host->claimed); | |
2082 | /* | |
2083 | * The card will be considered unchanged unless we have been asked to | |
2084 | * detect a change or host requires polling to provide card detection. | |
2085 | */ | |
2086 | if (card && !host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) | |
2087 | return mmc_card_removed(card); | |
2088 | ||
2089 | host->detect_change = 0; | |
2090 | ||
2091 | return _mmc_detect_card_removed(host); | |
2092 | } | |
2093 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2094 | ||
b93931a6 | 2095 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2096 | { |
807e8e40 | 2097 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
c4028958 DH |
2098 | struct mmc_host *host = |
2099 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2100 | int i; |
4c2ef25f | 2101 | |
807e8e40 | 2102 | if (host->rescan_disable) |
4c2ef25f | 2103 | return; |
1da177e4 | 2104 | |
7ea239d9 | 2105 | mmc_bus_get(host); |
b855885e | 2106 | |
30201e7f OBC |
2107 | /* |
2108 | * if there is a _removable_ card registered, check whether it is | |
2109 | * still present | |
2110 | */ | |
2111 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 2112 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
2113 | host->bus_ops->detect(host); |
2114 | ||
d3049504 AH |
2115 | host->detect_change = 0; |
2116 | ||
c5841798 CB |
2117 | /* |
2118 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2119 | * the card is no longer present. | |
2120 | */ | |
94d89efb | 2121 | mmc_bus_put(host); |
94d89efb JS |
2122 | mmc_bus_get(host); |
2123 | ||
2124 | /* if there still is a card present, stop here */ | |
2125 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2126 | mmc_bus_put(host); |
94d89efb JS |
2127 | goto out; |
2128 | } | |
1da177e4 | 2129 | |
94d89efb JS |
2130 | /* |
2131 | * Only we can add a new handler, so it's safe to | |
2132 | * release the lock here. | |
2133 | */ | |
2134 | mmc_bus_put(host); | |
1da177e4 | 2135 | |
94d89efb JS |
2136 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
2137 | goto out; | |
1da177e4 | 2138 | |
807e8e40 | 2139 | mmc_claim_host(host); |
88ae8b86 | 2140 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2141 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2142 | break; | |
06b2233a | 2143 | if (freqs[i] <= host->f_min) |
807e8e40 | 2144 | break; |
88ae8b86 | 2145 | } |
807e8e40 AR |
2146 | mmc_release_host(host); |
2147 | ||
2148 | out: | |
28f52482 AV |
2149 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2150 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2151 | } |
2152 | ||
b93931a6 | 2153 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2154 | { |
b93931a6 PO |
2155 | mmc_power_off(host); |
2156 | mmc_detect_change(host, 0); | |
1da177e4 LT |
2157 | } |
2158 | ||
b93931a6 | 2159 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2160 | { |
3b91e550 | 2161 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2162 | unsigned long flags; |
2163 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2164 | host->removed = 1; |
1efd48b3 | 2165 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
2166 | #endif |
2167 | ||
8ea926b2 AH |
2168 | if (host->caps & MMC_CAP_DISABLE) |
2169 | cancel_delayed_work(&host->disable); | |
d9bcbf34 | 2170 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
2171 | mmc_flush_scheduled_work(); |
2172 | ||
da68c4eb NP |
2173 | /* clear pm flags now and let card drivers set them as needed */ |
2174 | host->pm_flags = 0; | |
2175 | ||
7ea239d9 PO |
2176 | mmc_bus_get(host); |
2177 | if (host->bus_ops && !host->bus_dead) { | |
2178 | if (host->bus_ops->remove) | |
2179 | host->bus_ops->remove(host); | |
2180 | ||
2181 | mmc_claim_host(host); | |
2182 | mmc_detach_bus(host); | |
7f7e4129 | 2183 | mmc_power_off(host); |
7ea239d9 | 2184 | mmc_release_host(host); |
53509f0f DK |
2185 | mmc_bus_put(host); |
2186 | return; | |
1da177e4 | 2187 | } |
7ea239d9 PO |
2188 | mmc_bus_put(host); |
2189 | ||
2190 | BUG_ON(host->card); | |
1da177e4 LT |
2191 | |
2192 | mmc_power_off(host); | |
2193 | } | |
2194 | ||
12ae637f | 2195 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2196 | { |
12ae637f OBC |
2197 | int ret = 0; |
2198 | ||
bb9cab94 DD |
2199 | #ifdef CONFIG_MMC_DEBUG |
2200 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2201 | #endif | |
2202 | ||
eae1aeee AH |
2203 | mmc_bus_get(host); |
2204 | ||
2205 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2206 | mmc_bus_put(host); | |
12ae637f | 2207 | return -EINVAL; |
eae1aeee AH |
2208 | } |
2209 | ||
2210 | if (host->bus_ops->power_save) | |
12ae637f | 2211 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2212 | |
2213 | mmc_bus_put(host); | |
2214 | ||
2215 | mmc_power_off(host); | |
12ae637f OBC |
2216 | |
2217 | return ret; | |
eae1aeee AH |
2218 | } |
2219 | EXPORT_SYMBOL(mmc_power_save_host); | |
2220 | ||
12ae637f | 2221 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2222 | { |
12ae637f OBC |
2223 | int ret; |
2224 | ||
bb9cab94 DD |
2225 | #ifdef CONFIG_MMC_DEBUG |
2226 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2227 | #endif | |
2228 | ||
eae1aeee AH |
2229 | mmc_bus_get(host); |
2230 | ||
2231 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2232 | mmc_bus_put(host); | |
12ae637f | 2233 | return -EINVAL; |
eae1aeee AH |
2234 | } |
2235 | ||
2236 | mmc_power_up(host); | |
12ae637f | 2237 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2238 | |
2239 | mmc_bus_put(host); | |
12ae637f OBC |
2240 | |
2241 | return ret; | |
eae1aeee AH |
2242 | } |
2243 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2244 | ||
b1ebe384 JL |
2245 | int mmc_card_awake(struct mmc_host *host) |
2246 | { | |
2247 | int err = -ENOSYS; | |
2248 | ||
2249 | mmc_bus_get(host); | |
2250 | ||
2251 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
2252 | err = host->bus_ops->awake(host); | |
2253 | ||
2254 | mmc_bus_put(host); | |
2255 | ||
2256 | return err; | |
2257 | } | |
2258 | EXPORT_SYMBOL(mmc_card_awake); | |
2259 | ||
2260 | int mmc_card_sleep(struct mmc_host *host) | |
2261 | { | |
2262 | int err = -ENOSYS; | |
2263 | ||
2264 | mmc_bus_get(host); | |
2265 | ||
c99872a1 | 2266 | if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep) |
b1ebe384 JL |
2267 | err = host->bus_ops->sleep(host); |
2268 | ||
2269 | mmc_bus_put(host); | |
2270 | ||
2271 | return err; | |
2272 | } | |
2273 | EXPORT_SYMBOL(mmc_card_sleep); | |
2274 | ||
2275 | int mmc_card_can_sleep(struct mmc_host *host) | |
2276 | { | |
2277 | struct mmc_card *card = host->card; | |
2278 | ||
2279 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
2280 | return 1; | |
2281 | return 0; | |
2282 | } | |
2283 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
2284 | ||
881d1c25 SJ |
2285 | /* |
2286 | * Flush the cache to the non-volatile storage. | |
2287 | */ | |
2288 | int mmc_flush_cache(struct mmc_card *card) | |
2289 | { | |
2290 | struct mmc_host *host = card->host; | |
2291 | int err = 0; | |
2292 | ||
2293 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL)) | |
2294 | return err; | |
2295 | ||
2296 | if (mmc_card_mmc(card) && | |
2297 | (card->ext_csd.cache_size > 0) && | |
2298 | (card->ext_csd.cache_ctrl & 1)) { | |
2299 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2300 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2301 | if (err) | |
2302 | pr_err("%s: cache flush error %d\n", | |
2303 | mmc_hostname(card->host), err); | |
2304 | } | |
2305 | ||
2306 | return err; | |
2307 | } | |
2308 | EXPORT_SYMBOL(mmc_flush_cache); | |
2309 | ||
2310 | /* | |
2311 | * Turn the cache ON/OFF. | |
2312 | * Turning the cache OFF shall trigger flushing of the data | |
2313 | * to the non-volatile storage. | |
2314 | */ | |
2315 | int mmc_cache_ctrl(struct mmc_host *host, u8 enable) | |
2316 | { | |
2317 | struct mmc_card *card = host->card; | |
2318 | int err = 0; | |
2319 | ||
2320 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) || | |
2321 | mmc_card_is_removable(host)) | |
2322 | return err; | |
2323 | ||
2324 | if (card && mmc_card_mmc(card) && | |
2325 | (card->ext_csd.cache_size > 0)) { | |
2326 | enable = !!enable; | |
2327 | ||
2328 | if (card->ext_csd.cache_ctrl ^ enable) | |
2329 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2330 | EXT_CSD_CACHE_CTRL, enable, 0); | |
2331 | if (err) | |
2332 | pr_err("%s: cache %s error %d\n", | |
2333 | mmc_hostname(card->host), | |
2334 | enable ? "on" : "off", | |
2335 | err); | |
2336 | else | |
2337 | card->ext_csd.cache_ctrl = enable; | |
2338 | } | |
2339 | ||
2340 | return err; | |
2341 | } | |
2342 | EXPORT_SYMBOL(mmc_cache_ctrl); | |
2343 | ||
1da177e4 LT |
2344 | #ifdef CONFIG_PM |
2345 | ||
2346 | /** | |
2347 | * mmc_suspend_host - suspend a host | |
2348 | * @host: mmc host | |
1da177e4 | 2349 | */ |
1a13f8fa | 2350 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 2351 | { |
95cdfb72 NP |
2352 | int err = 0; |
2353 | ||
8ea926b2 AH |
2354 | if (host->caps & MMC_CAP_DISABLE) |
2355 | cancel_delayed_work(&host->disable); | |
7de427d0 | 2356 | cancel_delayed_work(&host->detect); |
b5af25be | 2357 | mmc_flush_scheduled_work(); |
881d1c25 SJ |
2358 | err = mmc_cache_ctrl(host, 0); |
2359 | if (err) | |
2360 | goto out; | |
b5af25be | 2361 | |
7ea239d9 PO |
2362 | mmc_bus_get(host); |
2363 | if (host->bus_ops && !host->bus_dead) { | |
b6ad726e UH |
2364 | |
2365 | /* | |
2366 | * A long response time is not acceptable for device drivers | |
2367 | * when doing suspend. Prevent mmc_claim_host in the suspend | |
2368 | * sequence, to potentially wait "forever" by trying to | |
2369 | * pre-claim the host. | |
2370 | */ | |
2371 | if (mmc_try_claim_host(host)) { | |
a80f1627 G |
2372 | if (host->bus_ops->suspend) { |
2373 | /* | |
2374 | * For eMMC 4.5 device send notify command | |
2375 | * before sleep, because in sleep state eMMC 4.5 | |
2376 | * devices respond to only RESET and AWAKE cmd | |
2377 | */ | |
2378 | mmc_poweroff_notify(host); | |
b6ad726e | 2379 | err = host->bus_ops->suspend(host); |
a80f1627 | 2380 | } |
49df7807 SRT |
2381 | mmc_do_release_host(host); |
2382 | ||
b6ad726e UH |
2383 | if (err == -ENOSYS || !host->bus_ops->resume) { |
2384 | /* | |
2385 | * We simply "remove" the card in this case. | |
2386 | * It will be redetected on resume. | |
2387 | */ | |
2388 | if (host->bus_ops->remove) | |
2389 | host->bus_ops->remove(host); | |
2390 | mmc_claim_host(host); | |
2391 | mmc_detach_bus(host); | |
2392 | mmc_power_off(host); | |
2393 | mmc_release_host(host); | |
2394 | host->pm_flags = 0; | |
2395 | err = 0; | |
2396 | } | |
b6ad726e UH |
2397 | } else { |
2398 | err = -EBUSY; | |
1c8cf9c9 | 2399 | } |
b5af25be | 2400 | } |
7ea239d9 PO |
2401 | mmc_bus_put(host); |
2402 | ||
a5e9425d | 2403 | if (!err && !mmc_card_keep_power(host)) |
95cdfb72 | 2404 | mmc_power_off(host); |
1da177e4 | 2405 | |
881d1c25 | 2406 | out: |
95cdfb72 | 2407 | return err; |
1da177e4 LT |
2408 | } |
2409 | ||
2410 | EXPORT_SYMBOL(mmc_suspend_host); | |
2411 | ||
2412 | /** | |
2413 | * mmc_resume_host - resume a previously suspended host | |
2414 | * @host: mmc host | |
2415 | */ | |
2416 | int mmc_resume_host(struct mmc_host *host) | |
2417 | { | |
95cdfb72 NP |
2418 | int err = 0; |
2419 | ||
6abaa0c9 PO |
2420 | mmc_bus_get(host); |
2421 | if (host->bus_ops && !host->bus_dead) { | |
a5e9425d | 2422 | if (!mmc_card_keep_power(host)) { |
da68c4eb NP |
2423 | mmc_power_up(host); |
2424 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
2425 | /* |
2426 | * Tell runtime PM core we just powered up the card, | |
2427 | * since it still believes the card is powered off. | |
2428 | * Note that currently runtime PM is only enabled | |
2429 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
2430 | */ | |
2431 | if (mmc_card_sdio(host->card) && | |
2432 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
2433 | pm_runtime_disable(&host->card->dev); | |
2434 | pm_runtime_set_active(&host->card->dev); | |
2435 | pm_runtime_enable(&host->card->dev); | |
2436 | } | |
da68c4eb | 2437 | } |
6abaa0c9 | 2438 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
2439 | err = host->bus_ops->resume(host); |
2440 | if (err) { | |
a3c76eb9 | 2441 | pr_warning("%s: error %d during resume " |
95cdfb72 NP |
2442 | "(card was removed?)\n", |
2443 | mmc_hostname(host), err); | |
95cdfb72 NP |
2444 | err = 0; |
2445 | } | |
6abaa0c9 | 2446 | } |
a8e6df73 | 2447 | host->pm_flags &= ~MMC_PM_KEEP_POWER; |
6abaa0c9 PO |
2448 | mmc_bus_put(host); |
2449 | ||
95cdfb72 | 2450 | return err; |
1da177e4 | 2451 | } |
1da177e4 LT |
2452 | EXPORT_SYMBOL(mmc_resume_host); |
2453 | ||
4c2ef25f ML |
2454 | /* Do the card removal on suspend if card is assumed removeable |
2455 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2456 | to sync the card. | |
2457 | */ | |
2458 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2459 | unsigned long mode, void *unused) | |
2460 | { | |
2461 | struct mmc_host *host = container_of( | |
2462 | notify_block, struct mmc_host, pm_notify); | |
2463 | unsigned long flags; | |
2464 | ||
2465 | ||
2466 | switch (mode) { | |
2467 | case PM_HIBERNATION_PREPARE: | |
2468 | case PM_SUSPEND_PREPARE: | |
2469 | ||
2470 | spin_lock_irqsave(&host->lock, flags); | |
2471 | host->rescan_disable = 1; | |
bec8726a | 2472 | host->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT; |
4c2ef25f ML |
2473 | spin_unlock_irqrestore(&host->lock, flags); |
2474 | cancel_delayed_work_sync(&host->detect); | |
2475 | ||
2476 | if (!host->bus_ops || host->bus_ops->suspend) | |
2477 | break; | |
2478 | ||
2479 | mmc_claim_host(host); | |
2480 | ||
2481 | if (host->bus_ops->remove) | |
2482 | host->bus_ops->remove(host); | |
2483 | ||
2484 | mmc_detach_bus(host); | |
7f7e4129 | 2485 | mmc_power_off(host); |
4c2ef25f ML |
2486 | mmc_release_host(host); |
2487 | host->pm_flags = 0; | |
2488 | break; | |
2489 | ||
2490 | case PM_POST_SUSPEND: | |
2491 | case PM_POST_HIBERNATION: | |
274476f8 | 2492 | case PM_POST_RESTORE: |
4c2ef25f ML |
2493 | |
2494 | spin_lock_irqsave(&host->lock, flags); | |
2495 | host->rescan_disable = 0; | |
bec8726a | 2496 | host->power_notify_type = MMC_HOST_PW_NOTIFY_LONG; |
4c2ef25f ML |
2497 | spin_unlock_irqrestore(&host->lock, flags); |
2498 | mmc_detect_change(host, 0); | |
2499 | ||
2500 | } | |
2501 | ||
2502 | return 0; | |
2503 | } | |
1da177e4 LT |
2504 | #endif |
2505 | ||
ffce2e7e PO |
2506 | static int __init mmc_init(void) |
2507 | { | |
2508 | int ret; | |
2509 | ||
0d9ee5b2 | 2510 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2511 | if (!workqueue) |
2512 | return -ENOMEM; | |
2513 | ||
2514 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2515 | if (ret) |
2516 | goto destroy_workqueue; | |
2517 | ||
2518 | ret = mmc_register_host_class(); | |
2519 | if (ret) | |
2520 | goto unregister_bus; | |
2521 | ||
2522 | ret = sdio_register_bus(); | |
2523 | if (ret) | |
2524 | goto unregister_host_class; | |
2525 | ||
2526 | return 0; | |
2527 | ||
2528 | unregister_host_class: | |
2529 | mmc_unregister_host_class(); | |
2530 | unregister_bus: | |
2531 | mmc_unregister_bus(); | |
2532 | destroy_workqueue: | |
2533 | destroy_workqueue(workqueue); | |
2534 | ||
ffce2e7e PO |
2535 | return ret; |
2536 | } | |
2537 | ||
2538 | static void __exit mmc_exit(void) | |
2539 | { | |
e29a7d73 | 2540 | sdio_unregister_bus(); |
ffce2e7e PO |
2541 | mmc_unregister_host_class(); |
2542 | mmc_unregister_bus(); | |
2543 | destroy_workqueue(workqueue); | |
2544 | } | |
2545 | ||
26074962 | 2546 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2547 | module_exit(mmc_exit); |
2548 | ||
1da177e4 | 2549 | MODULE_LICENSE("GPL"); |