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> | |
950d56ac | 29 | #include <linux/slab.h> |
1da177e4 LT |
30 | |
31 | #include <linux/mmc/card.h> | |
32 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
33 | #include <linux/mmc/mmc.h> |
34 | #include <linux/mmc/sd.h> | |
1da177e4 | 35 | |
aaac1b47 | 36 | #include "core.h" |
ffce2e7e PO |
37 | #include "bus.h" |
38 | #include "host.h" | |
e29a7d73 | 39 | #include "sdio_bus.h" |
da7fbe58 PO |
40 | |
41 | #include "mmc_ops.h" | |
42 | #include "sd_ops.h" | |
5c4e6f13 | 43 | #include "sdio_ops.h" |
1da177e4 | 44 | |
950d56ac JC |
45 | /* |
46 | * Background operations can take a long time, depending on the housekeeping | |
47 | * operations the card has to perform. | |
48 | */ | |
49 | #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */ | |
50 | ||
ffce2e7e | 51 | static struct workqueue_struct *workqueue; |
fa550189 | 52 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 53 | |
af517150 DB |
54 | /* |
55 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
56 | * performance cost, and for other reasons may not always be desired. | |
57 | * So we allow it it to be disabled. | |
58 | */ | |
90ab5ee9 | 59 | bool use_spi_crc = 1; |
af517150 DB |
60 | module_param(use_spi_crc, bool, 0); |
61 | ||
bd68e083 BH |
62 | /* |
63 | * We normally treat cards as removed during suspend if they are not | |
64 | * known to be on a non-removable bus, to avoid the risk of writing | |
65 | * back data to a different card after resume. Allow this to be | |
66 | * overridden if necessary. | |
67 | */ | |
68 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
90ab5ee9 | 69 | bool mmc_assume_removable; |
bd68e083 | 70 | #else |
90ab5ee9 | 71 | bool mmc_assume_removable = 1; |
bd68e083 | 72 | #endif |
71d7d3d1 | 73 | EXPORT_SYMBOL(mmc_assume_removable); |
bd68e083 BH |
74 | module_param_named(removable, mmc_assume_removable, bool, 0644); |
75 | MODULE_PARM_DESC( | |
76 | removable, | |
77 | "MMC/SD cards are removable and may be removed during suspend"); | |
78 | ||
ffce2e7e PO |
79 | /* |
80 | * Internal function. Schedule delayed work in the MMC work queue. | |
81 | */ | |
82 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
83 | unsigned long delay) | |
84 | { | |
85 | return queue_delayed_work(workqueue, work, delay); | |
86 | } | |
87 | ||
88 | /* | |
89 | * Internal function. Flush all scheduled work from the MMC work queue. | |
90 | */ | |
91 | static void mmc_flush_scheduled_work(void) | |
92 | { | |
93 | flush_workqueue(workqueue); | |
94 | } | |
95 | ||
1b676f70 PF |
96 | #ifdef CONFIG_FAIL_MMC_REQUEST |
97 | ||
98 | /* | |
99 | * Internal function. Inject random data errors. | |
100 | * If mmc_data is NULL no errors are injected. | |
101 | */ | |
102 | static void mmc_should_fail_request(struct mmc_host *host, | |
103 | struct mmc_request *mrq) | |
104 | { | |
105 | struct mmc_command *cmd = mrq->cmd; | |
106 | struct mmc_data *data = mrq->data; | |
107 | static const int data_errors[] = { | |
108 | -ETIMEDOUT, | |
109 | -EILSEQ, | |
110 | -EIO, | |
111 | }; | |
112 | ||
113 | if (!data) | |
114 | return; | |
115 | ||
116 | if (cmd->error || data->error || | |
117 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
118 | return; | |
119 | ||
120 | data->error = data_errors[random32() % ARRAY_SIZE(data_errors)]; | |
121 | data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9; | |
122 | } | |
123 | ||
124 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
125 | ||
126 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
127 | struct mmc_request *mrq) | |
128 | { | |
129 | } | |
130 | ||
131 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
132 | ||
1da177e4 | 133 | /** |
fe10c6ab RK |
134 | * mmc_request_done - finish processing an MMC request |
135 | * @host: MMC host which completed request | |
136 | * @mrq: MMC request which request | |
1da177e4 LT |
137 | * |
138 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 139 | * their processing of a request. |
1da177e4 LT |
140 | */ |
141 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
142 | { | |
143 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
144 | int err = cmd->error; |
145 | ||
af517150 DB |
146 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
147 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
148 | cmd->retries = 0; | |
149 | } | |
150 | ||
d3049504 | 151 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
152 | /* |
153 | * Request starter must handle retries - see | |
154 | * mmc_wait_for_req_done(). | |
155 | */ | |
156 | if (mrq->done) | |
157 | mrq->done(mrq); | |
e4d21708 | 158 | } else { |
1b676f70 PF |
159 | mmc_should_fail_request(host, mrq); |
160 | ||
af8350c7 PO |
161 | led_trigger_event(host->led, LED_OFF); |
162 | ||
e4d21708 PO |
163 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
164 | mmc_hostname(host), cmd->opcode, err, | |
165 | cmd->resp[0], cmd->resp[1], | |
166 | cmd->resp[2], cmd->resp[3]); | |
167 | ||
168 | if (mrq->data) { | |
169 | pr_debug("%s: %d bytes transferred: %d\n", | |
170 | mmc_hostname(host), | |
171 | mrq->data->bytes_xfered, mrq->data->error); | |
172 | } | |
173 | ||
174 | if (mrq->stop) { | |
175 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
176 | mmc_hostname(host), mrq->stop->opcode, | |
177 | mrq->stop->error, | |
178 | mrq->stop->resp[0], mrq->stop->resp[1], | |
179 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
180 | } | |
181 | ||
182 | if (mrq->done) | |
183 | mrq->done(mrq); | |
04566831 | 184 | |
08c14071 | 185 | mmc_host_clk_release(host); |
1da177e4 LT |
186 | } |
187 | } | |
188 | ||
189 | EXPORT_SYMBOL(mmc_request_done); | |
190 | ||
39361851 | 191 | static void |
1da177e4 LT |
192 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
193 | { | |
976d9276 PO |
194 | #ifdef CONFIG_MMC_DEBUG |
195 | unsigned int i, sz; | |
a84756c5 | 196 | struct scatterlist *sg; |
976d9276 PO |
197 | #endif |
198 | ||
7b2fd4f2 JC |
199 | if (mrq->sbc) { |
200 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
201 | mmc_hostname(host), mrq->sbc->opcode, | |
202 | mrq->sbc->arg, mrq->sbc->flags); | |
203 | } | |
204 | ||
920e70c5 RK |
205 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
206 | mmc_hostname(host), mrq->cmd->opcode, | |
207 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 208 | |
e4d21708 PO |
209 | if (mrq->data) { |
210 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
211 | "tsac %d ms nsac %d\n", | |
212 | mmc_hostname(host), mrq->data->blksz, | |
213 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 214 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
215 | mrq->data->timeout_clks); |
216 | } | |
217 | ||
218 | if (mrq->stop) { | |
219 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
220 | mmc_hostname(host), mrq->stop->opcode, | |
221 | mrq->stop->arg, mrq->stop->flags); | |
222 | } | |
223 | ||
f22ee4ed | 224 | WARN_ON(!host->claimed); |
1da177e4 LT |
225 | |
226 | mrq->cmd->error = 0; | |
227 | mrq->cmd->mrq = mrq; | |
228 | if (mrq->data) { | |
fe4a3c7a | 229 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
230 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
231 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
232 | host->max_req_size); | |
fe4a3c7a | 233 | |
976d9276 PO |
234 | #ifdef CONFIG_MMC_DEBUG |
235 | sz = 0; | |
a84756c5 PO |
236 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
237 | sz += sg->length; | |
976d9276 PO |
238 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
239 | #endif | |
240 | ||
1da177e4 LT |
241 | mrq->cmd->data = mrq->data; |
242 | mrq->data->error = 0; | |
243 | mrq->data->mrq = mrq; | |
244 | if (mrq->stop) { | |
245 | mrq->data->stop = mrq->stop; | |
246 | mrq->stop->error = 0; | |
247 | mrq->stop->mrq = mrq; | |
248 | } | |
249 | } | |
08c14071 | 250 | mmc_host_clk_hold(host); |
66c036e0 | 251 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
252 | host->ops->request(host, mrq); |
253 | } | |
254 | ||
950d56ac JC |
255 | /** |
256 | * mmc_start_bkops - start BKOPS for supported cards | |
257 | * @card: MMC card to start BKOPS | |
258 | * @form_exception: A flag to indicate if this function was | |
259 | * called due to an exception raised by the card | |
260 | * | |
261 | * Start background operations whenever requested. | |
262 | * When the urgent BKOPS bit is set in a R1 command response | |
263 | * then background operations should be started immediately. | |
264 | */ | |
265 | void mmc_start_bkops(struct mmc_card *card, bool from_exception) | |
266 | { | |
267 | int err; | |
268 | int timeout; | |
269 | bool use_busy_signal; | |
270 | ||
271 | BUG_ON(!card); | |
272 | ||
273 | if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card)) | |
274 | return; | |
275 | ||
276 | err = mmc_read_bkops_status(card); | |
277 | if (err) { | |
278 | pr_err("%s: Failed to read bkops status: %d\n", | |
279 | mmc_hostname(card->host), err); | |
280 | return; | |
281 | } | |
282 | ||
283 | if (!card->ext_csd.raw_bkops_status) | |
284 | return; | |
285 | ||
286 | if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 && | |
287 | from_exception) | |
288 | return; | |
289 | ||
290 | mmc_claim_host(card->host); | |
291 | if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) { | |
292 | timeout = MMC_BKOPS_MAX_TIMEOUT; | |
293 | use_busy_signal = true; | |
294 | } else { | |
295 | timeout = 0; | |
296 | use_busy_signal = false; | |
297 | } | |
298 | ||
299 | err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
300 | EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal); | |
301 | if (err) { | |
302 | pr_warn("%s: Error %d starting bkops\n", | |
303 | mmc_hostname(card->host), err); | |
304 | goto out; | |
305 | } | |
306 | ||
307 | /* | |
308 | * For urgent bkops status (LEVEL_2 and more) | |
309 | * bkops executed synchronously, otherwise | |
310 | * the operation is in progress | |
311 | */ | |
312 | if (!use_busy_signal) | |
313 | mmc_card_set_doing_bkops(card); | |
314 | out: | |
315 | mmc_release_host(card->host); | |
316 | } | |
317 | EXPORT_SYMBOL(mmc_start_bkops); | |
318 | ||
1da177e4 LT |
319 | static void mmc_wait_done(struct mmc_request *mrq) |
320 | { | |
aa8b683a PF |
321 | complete(&mrq->completion); |
322 | } | |
323 | ||
956d9fd5 | 324 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a PF |
325 | { |
326 | init_completion(&mrq->completion); | |
327 | mrq->done = mmc_wait_done; | |
d3049504 AH |
328 | if (mmc_card_removed(host->card)) { |
329 | mrq->cmd->error = -ENOMEDIUM; | |
330 | complete(&mrq->completion); | |
956d9fd5 | 331 | return -ENOMEDIUM; |
d3049504 | 332 | } |
aa8b683a | 333 | mmc_start_request(host, mrq); |
956d9fd5 | 334 | return 0; |
aa8b683a PF |
335 | } |
336 | ||
337 | static void mmc_wait_for_req_done(struct mmc_host *host, | |
338 | struct mmc_request *mrq) | |
339 | { | |
08a7e1df AH |
340 | struct mmc_command *cmd; |
341 | ||
342 | while (1) { | |
343 | wait_for_completion(&mrq->completion); | |
344 | ||
345 | cmd = mrq->cmd; | |
d3049504 AH |
346 | if (!cmd->error || !cmd->retries || |
347 | mmc_card_removed(host->card)) | |
08a7e1df AH |
348 | break; |
349 | ||
350 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
351 | mmc_hostname(host), cmd->opcode, cmd->error); | |
352 | cmd->retries--; | |
353 | cmd->error = 0; | |
354 | host->ops->request(host, mrq); | |
355 | } | |
aa8b683a PF |
356 | } |
357 | ||
358 | /** | |
359 | * mmc_pre_req - Prepare for a new request | |
360 | * @host: MMC host to prepare command | |
361 | * @mrq: MMC request to prepare for | |
362 | * @is_first_req: true if there is no previous started request | |
363 | * that may run in parellel to this call, otherwise false | |
364 | * | |
365 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
366 | * host prepare for the new request. Preparation of a request may be | |
367 | * performed while another request is running on the host. | |
368 | */ | |
369 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
370 | bool is_first_req) | |
371 | { | |
2c4967f7 SRT |
372 | if (host->ops->pre_req) { |
373 | mmc_host_clk_hold(host); | |
aa8b683a | 374 | host->ops->pre_req(host, mrq, is_first_req); |
2c4967f7 SRT |
375 | mmc_host_clk_release(host); |
376 | } | |
aa8b683a PF |
377 | } |
378 | ||
379 | /** | |
380 | * mmc_post_req - Post process a completed request | |
381 | * @host: MMC host to post process command | |
382 | * @mrq: MMC request to post process for | |
383 | * @err: Error, if non zero, clean up any resources made in pre_req | |
384 | * | |
385 | * Let the host post process a completed request. Post processing of | |
386 | * a request may be performed while another reuqest is running. | |
387 | */ | |
388 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
389 | int err) | |
390 | { | |
2c4967f7 SRT |
391 | if (host->ops->post_req) { |
392 | mmc_host_clk_hold(host); | |
aa8b683a | 393 | host->ops->post_req(host, mrq, err); |
2c4967f7 SRT |
394 | mmc_host_clk_release(host); |
395 | } | |
1da177e4 LT |
396 | } |
397 | ||
aa8b683a PF |
398 | /** |
399 | * mmc_start_req - start a non-blocking request | |
400 | * @host: MMC host to start command | |
401 | * @areq: async request to start | |
402 | * @error: out parameter returns 0 for success, otherwise non zero | |
403 | * | |
404 | * Start a new MMC custom command request for a host. | |
405 | * If there is on ongoing async request wait for completion | |
406 | * of that request and start the new one and return. | |
407 | * Does not wait for the new request to complete. | |
408 | * | |
409 | * Returns the completed request, NULL in case of none completed. | |
410 | * Wait for the an ongoing request (previoulsy started) to complete and | |
411 | * return the completed request. If there is no ongoing request, NULL | |
412 | * is returned without waiting. NULL is not an error condition. | |
413 | */ | |
414 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
415 | struct mmc_async_req *areq, int *error) | |
416 | { | |
417 | int err = 0; | |
956d9fd5 | 418 | int start_err = 0; |
aa8b683a PF |
419 | struct mmc_async_req *data = host->areq; |
420 | ||
421 | /* Prepare a new request */ | |
422 | if (areq) | |
423 | mmc_pre_req(host, areq->mrq, !host->areq); | |
424 | ||
425 | if (host->areq) { | |
426 | mmc_wait_for_req_done(host, host->areq->mrq); | |
427 | err = host->areq->err_check(host->card, host->areq); | |
950d56ac JC |
428 | /* |
429 | * Check BKOPS urgency for each R1 response | |
430 | */ | |
431 | if (host->card && mmc_card_mmc(host->card) && | |
432 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
433 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
434 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) | |
435 | mmc_start_bkops(host->card, true); | |
aa8b683a PF |
436 | } |
437 | ||
956d9fd5 UH |
438 | if (!err && areq) |
439 | start_err = __mmc_start_req(host, areq->mrq); | |
aa8b683a PF |
440 | |
441 | if (host->areq) | |
442 | mmc_post_req(host, host->areq->mrq, 0); | |
443 | ||
956d9fd5 UH |
444 | /* Cancel a prepared request if it was not started. */ |
445 | if ((err || start_err) && areq) | |
446 | mmc_post_req(host, areq->mrq, -EINVAL); | |
447 | ||
448 | if (err) | |
449 | host->areq = NULL; | |
450 | else | |
451 | host->areq = areq; | |
452 | ||
aa8b683a PF |
453 | if (error) |
454 | *error = err; | |
455 | return data; | |
456 | } | |
457 | EXPORT_SYMBOL(mmc_start_req); | |
458 | ||
67a61c48 PO |
459 | /** |
460 | * mmc_wait_for_req - start a request and wait for completion | |
461 | * @host: MMC host to start command | |
462 | * @mrq: MMC request to start | |
463 | * | |
464 | * Start a new MMC custom command request for a host, and wait | |
465 | * for the command to complete. Does not attempt to parse the | |
466 | * response. | |
467 | */ | |
468 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 469 | { |
aa8b683a PF |
470 | __mmc_start_req(host, mrq); |
471 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 472 | } |
1da177e4 LT |
473 | EXPORT_SYMBOL(mmc_wait_for_req); |
474 | ||
eb0d8f13 JC |
475 | /** |
476 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
477 | * @card: the MMC card associated with the HPI transfer | |
478 | * | |
479 | * Issued High Priority Interrupt, and check for card status | |
950d56ac | 480 | * until out-of prg-state. |
eb0d8f13 JC |
481 | */ |
482 | int mmc_interrupt_hpi(struct mmc_card *card) | |
483 | { | |
484 | int err; | |
485 | u32 status; | |
6af9e96e | 486 | unsigned long prg_wait; |
eb0d8f13 JC |
487 | |
488 | BUG_ON(!card); | |
489 | ||
490 | if (!card->ext_csd.hpi_en) { | |
491 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
492 | return 1; | |
493 | } | |
494 | ||
495 | mmc_claim_host(card->host); | |
496 | err = mmc_send_status(card, &status); | |
497 | if (err) { | |
498 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
499 | goto out; | |
500 | } | |
501 | ||
6af9e96e V |
502 | switch (R1_CURRENT_STATE(status)) { |
503 | case R1_STATE_IDLE: | |
504 | case R1_STATE_READY: | |
505 | case R1_STATE_STBY: | |
211d4fe5 | 506 | case R1_STATE_TRAN: |
6af9e96e | 507 | /* |
211d4fe5 | 508 | * In idle and transfer states, HPI is not needed and the caller |
6af9e96e V |
509 | * can issue the next intended command immediately |
510 | */ | |
511 | goto out; | |
512 | case R1_STATE_PRG: | |
513 | break; | |
514 | default: | |
515 | /* In all other states, it's illegal to issue HPI */ | |
516 | pr_debug("%s: HPI cannot be sent. Card state=%d\n", | |
517 | mmc_hostname(card->host), R1_CURRENT_STATE(status)); | |
518 | err = -EINVAL; | |
519 | goto out; | |
520 | } | |
521 | ||
522 | err = mmc_send_hpi_cmd(card, &status); | |
523 | if (err) | |
524 | goto out; | |
525 | ||
526 | prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time); | |
527 | do { | |
528 | err = mmc_send_status(card, &status); | |
529 | ||
530 | if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN) | |
531 | break; | |
532 | if (time_after(jiffies, prg_wait)) | |
533 | err = -ETIMEDOUT; | |
534 | } while (!err); | |
eb0d8f13 JC |
535 | |
536 | out: | |
537 | mmc_release_host(card->host); | |
538 | return err; | |
539 | } | |
540 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
541 | ||
1da177e4 LT |
542 | /** |
543 | * mmc_wait_for_cmd - start a command and wait for completion | |
544 | * @host: MMC host to start command | |
545 | * @cmd: MMC command to start | |
546 | * @retries: maximum number of retries | |
547 | * | |
548 | * Start a new MMC command for a host, and wait for the command | |
549 | * to complete. Return any error that occurred while the command | |
550 | * was executing. Do not attempt to parse the response. | |
551 | */ | |
552 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
553 | { | |
ad5fd972 | 554 | struct mmc_request mrq = {NULL}; |
1da177e4 | 555 | |
d84075c8 | 556 | WARN_ON(!host->claimed); |
1da177e4 | 557 | |
1da177e4 LT |
558 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
559 | cmd->retries = retries; | |
560 | ||
561 | mrq.cmd = cmd; | |
562 | cmd->data = NULL; | |
563 | ||
564 | mmc_wait_for_req(host, &mrq); | |
565 | ||
566 | return cmd->error; | |
567 | } | |
568 | ||
569 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
570 | ||
950d56ac JC |
571 | /** |
572 | * mmc_stop_bkops - stop ongoing BKOPS | |
573 | * @card: MMC card to check BKOPS | |
574 | * | |
575 | * Send HPI command to stop ongoing background operations to | |
576 | * allow rapid servicing of foreground operations, e.g. read/ | |
577 | * writes. Wait until the card comes out of the programming state | |
578 | * to avoid errors in servicing read/write requests. | |
579 | */ | |
580 | int mmc_stop_bkops(struct mmc_card *card) | |
581 | { | |
582 | int err = 0; | |
583 | ||
584 | BUG_ON(!card); | |
585 | err = mmc_interrupt_hpi(card); | |
586 | ||
587 | /* | |
588 | * If err is EINVAL, we can't issue an HPI. | |
589 | * It should complete the BKOPS. | |
590 | */ | |
591 | if (!err || (err == -EINVAL)) { | |
592 | mmc_card_clr_doing_bkops(card); | |
593 | err = 0; | |
594 | } | |
595 | ||
596 | return err; | |
597 | } | |
598 | EXPORT_SYMBOL(mmc_stop_bkops); | |
599 | ||
600 | int mmc_read_bkops_status(struct mmc_card *card) | |
601 | { | |
602 | int err; | |
603 | u8 *ext_csd; | |
604 | ||
605 | /* | |
606 | * In future work, we should consider storing the entire ext_csd. | |
607 | */ | |
608 | ext_csd = kmalloc(512, GFP_KERNEL); | |
609 | if (!ext_csd) { | |
610 | pr_err("%s: could not allocate buffer to receive the ext_csd.\n", | |
611 | mmc_hostname(card->host)); | |
612 | return -ENOMEM; | |
613 | } | |
614 | ||
615 | mmc_claim_host(card->host); | |
616 | err = mmc_send_ext_csd(card, ext_csd); | |
617 | mmc_release_host(card->host); | |
618 | if (err) | |
619 | goto out; | |
620 | ||
621 | card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; | |
622 | card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS]; | |
623 | out: | |
624 | kfree(ext_csd); | |
625 | return err; | |
626 | } | |
627 | EXPORT_SYMBOL(mmc_read_bkops_status); | |
628 | ||
d773d725 RK |
629 | /** |
630 | * mmc_set_data_timeout - set the timeout for a data command | |
631 | * @data: data phase for command | |
632 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
633 | * |
634 | * Computes the data timeout parameters according to the | |
635 | * correct algorithm given the card type. | |
d773d725 | 636 | */ |
b146d26a | 637 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
638 | { |
639 | unsigned int mult; | |
640 | ||
e6f918bf PO |
641 | /* |
642 | * SDIO cards only define an upper 1 s limit on access. | |
643 | */ | |
644 | if (mmc_card_sdio(card)) { | |
645 | data->timeout_ns = 1000000000; | |
646 | data->timeout_clks = 0; | |
647 | return; | |
648 | } | |
649 | ||
d773d725 RK |
650 | /* |
651 | * SD cards use a 100 multiplier rather than 10 | |
652 | */ | |
653 | mult = mmc_card_sd(card) ? 100 : 10; | |
654 | ||
655 | /* | |
656 | * Scale up the multiplier (and therefore the timeout) by | |
657 | * the r2w factor for writes. | |
658 | */ | |
b146d26a | 659 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
660 | mult <<= card->csd.r2w_factor; |
661 | ||
662 | data->timeout_ns = card->csd.tacc_ns * mult; | |
663 | data->timeout_clks = card->csd.tacc_clks * mult; | |
664 | ||
665 | /* | |
666 | * SD cards also have an upper limit on the timeout. | |
667 | */ | |
668 | if (mmc_card_sd(card)) { | |
669 | unsigned int timeout_us, limit_us; | |
670 | ||
671 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
672 | if (mmc_host_clk_rate(card->host)) |
673 | timeout_us += data->timeout_clks * 1000 / | |
674 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 675 | |
b146d26a | 676 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 677 | /* |
3bdc9ba8 PW |
678 | * The MMC spec "It is strongly recommended |
679 | * for hosts to implement more than 500ms | |
680 | * timeout value even if the card indicates | |
681 | * the 250ms maximum busy length." Even the | |
682 | * previous value of 300ms is known to be | |
683 | * insufficient for some cards. | |
493890e7 | 684 | */ |
3bdc9ba8 | 685 | limit_us = 3000000; |
d773d725 RK |
686 | else |
687 | limit_us = 100000; | |
688 | ||
fba68bd2 PL |
689 | /* |
690 | * SDHC cards always use these fixed values. | |
691 | */ | |
692 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
693 | data->timeout_ns = limit_us * 1000; |
694 | data->timeout_clks = 0; | |
695 | } | |
696 | } | |
6de5fc9c SNX |
697 | |
698 | /* | |
699 | * Some cards require longer data read timeout than indicated in CSD. | |
700 | * Address this by setting the read timeout to a "reasonably high" | |
701 | * value. For the cards tested, 300ms has proven enough. If necessary, | |
702 | * this value can be increased if other problematic cards require this. | |
703 | */ | |
704 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
705 | data->timeout_ns = 300000000; | |
706 | data->timeout_clks = 0; | |
707 | } | |
708 | ||
c0c88871 WM |
709 | /* |
710 | * Some cards need very high timeouts if driven in SPI mode. | |
711 | * The worst observed timeout was 900ms after writing a | |
712 | * continuous stream of data until the internal logic | |
713 | * overflowed. | |
714 | */ | |
715 | if (mmc_host_is_spi(card->host)) { | |
716 | if (data->flags & MMC_DATA_WRITE) { | |
717 | if (data->timeout_ns < 1000000000) | |
718 | data->timeout_ns = 1000000000; /* 1s */ | |
719 | } else { | |
720 | if (data->timeout_ns < 100000000) | |
721 | data->timeout_ns = 100000000; /* 100ms */ | |
722 | } | |
723 | } | |
d773d725 RK |
724 | } |
725 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
726 | ||
ad3868b2 PO |
727 | /** |
728 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
729 | * @card: the MMC card associated with the data transfer | |
730 | * @sz: original transfer size | |
731 | * | |
732 | * Pads the original data size with a number of extra bytes in | |
733 | * order to avoid controller bugs and/or performance hits | |
734 | * (e.g. some controllers revert to PIO for certain sizes). | |
735 | * | |
736 | * Returns the improved size, which might be unmodified. | |
737 | * | |
738 | * Note that this function is only relevant when issuing a | |
739 | * single scatter gather entry. | |
740 | */ | |
741 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
742 | { | |
743 | /* | |
744 | * FIXME: We don't have a system for the controller to tell | |
745 | * the core about its problems yet, so for now we just 32-bit | |
746 | * align the size. | |
747 | */ | |
748 | sz = ((sz + 3) / 4) * 4; | |
749 | ||
750 | return sz; | |
751 | } | |
752 | EXPORT_SYMBOL(mmc_align_data_size); | |
753 | ||
1da177e4 | 754 | /** |
2342f332 | 755 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 756 | * @host: mmc host to claim |
2342f332 | 757 | * @abort: whether or not the operation should be aborted |
1da177e4 | 758 | * |
2342f332 NP |
759 | * Claim a host for a set of operations. If @abort is non null and |
760 | * dereference a non-zero value then this will return prematurely with | |
761 | * that non-zero value without acquiring the lock. Returns zero | |
762 | * with the lock held otherwise. | |
1da177e4 | 763 | */ |
2342f332 | 764 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
765 | { |
766 | DECLARE_WAITQUEUE(wait, current); | |
767 | unsigned long flags; | |
2342f332 | 768 | int stop; |
1da177e4 | 769 | |
cf795bfb PO |
770 | might_sleep(); |
771 | ||
1da177e4 LT |
772 | add_wait_queue(&host->wq, &wait); |
773 | spin_lock_irqsave(&host->lock, flags); | |
774 | while (1) { | |
775 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 776 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 777 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
778 | break; |
779 | spin_unlock_irqrestore(&host->lock, flags); | |
780 | schedule(); | |
781 | spin_lock_irqsave(&host->lock, flags); | |
782 | } | |
783 | set_current_state(TASK_RUNNING); | |
319a3f14 | 784 | if (!stop) { |
2342f332 | 785 | host->claimed = 1; |
319a3f14 AH |
786 | host->claimer = current; |
787 | host->claim_cnt += 1; | |
788 | } else | |
2342f332 | 789 | wake_up(&host->wq); |
1da177e4 LT |
790 | spin_unlock_irqrestore(&host->lock, flags); |
791 | remove_wait_queue(&host->wq, &wait); | |
907d2e7c AH |
792 | if (host->ops->enable && !stop && host->claim_cnt == 1) |
793 | host->ops->enable(host); | |
2342f332 | 794 | return stop; |
1da177e4 LT |
795 | } |
796 | ||
2342f332 | 797 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 798 | |
319a3f14 AH |
799 | /** |
800 | * mmc_try_claim_host - try exclusively to claim a host | |
801 | * @host: mmc host to claim | |
802 | * | |
803 | * Returns %1 if the host is claimed, %0 otherwise. | |
804 | */ | |
805 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
806 | { |
807 | int claimed_host = 0; | |
808 | unsigned long flags; | |
809 | ||
810 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 811 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 812 | host->claimed = 1; |
319a3f14 AH |
813 | host->claimer = current; |
814 | host->claim_cnt += 1; | |
8ea926b2 AH |
815 | claimed_host = 1; |
816 | } | |
817 | spin_unlock_irqrestore(&host->lock, flags); | |
907d2e7c AH |
818 | if (host->ops->enable && claimed_host && host->claim_cnt == 1) |
819 | host->ops->enable(host); | |
8ea926b2 AH |
820 | return claimed_host; |
821 | } | |
319a3f14 | 822 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 823 | |
ab1efd27 | 824 | /** |
907d2e7c | 825 | * mmc_release_host - release a host |
ab1efd27 UH |
826 | * @host: mmc host to release |
827 | * | |
907d2e7c AH |
828 | * Release a MMC host, allowing others to claim the host |
829 | * for their operations. | |
ab1efd27 | 830 | */ |
907d2e7c | 831 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
832 | { |
833 | unsigned long flags; | |
834 | ||
907d2e7c AH |
835 | WARN_ON(!host->claimed); |
836 | ||
837 | if (host->ops->disable && host->claim_cnt == 1) | |
838 | host->ops->disable(host); | |
839 | ||
8ea926b2 | 840 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
841 | if (--host->claim_cnt) { |
842 | /* Release for nested claim */ | |
843 | spin_unlock_irqrestore(&host->lock, flags); | |
844 | } else { | |
845 | host->claimed = 0; | |
846 | host->claimer = NULL; | |
847 | spin_unlock_irqrestore(&host->lock, flags); | |
848 | wake_up(&host->wq); | |
849 | } | |
8ea926b2 | 850 | } |
1da177e4 LT |
851 | EXPORT_SYMBOL(mmc_release_host); |
852 | ||
7ea239d9 PO |
853 | /* |
854 | * Internal function that does the actual ios call to the host driver, | |
855 | * optionally printing some debug output. | |
856 | */ | |
920e70c5 RK |
857 | static inline void mmc_set_ios(struct mmc_host *host) |
858 | { | |
859 | struct mmc_ios *ios = &host->ios; | |
860 | ||
cd9277c0 PO |
861 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
862 | "width %u timing %u\n", | |
920e70c5 RK |
863 | mmc_hostname(host), ios->clock, ios->bus_mode, |
864 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 865 | ios->bus_width, ios->timing); |
fba68bd2 | 866 | |
04566831 LW |
867 | if (ios->clock > 0) |
868 | mmc_set_ungated(host); | |
920e70c5 RK |
869 | host->ops->set_ios(host, ios); |
870 | } | |
871 | ||
7ea239d9 PO |
872 | /* |
873 | * Control chip select pin on a host. | |
874 | */ | |
da7fbe58 | 875 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 876 | { |
778e277c | 877 | mmc_host_clk_hold(host); |
da7fbe58 PO |
878 | host->ios.chip_select = mode; |
879 | mmc_set_ios(host); | |
778e277c | 880 | mmc_host_clk_release(host); |
1da177e4 LT |
881 | } |
882 | ||
7ea239d9 PO |
883 | /* |
884 | * Sets the host clock to the highest possible frequency that | |
885 | * is below "hz". | |
886 | */ | |
778e277c | 887 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
888 | { |
889 | WARN_ON(hz < host->f_min); | |
890 | ||
891 | if (hz > host->f_max) | |
892 | hz = host->f_max; | |
893 | ||
894 | host->ios.clock = hz; | |
895 | mmc_set_ios(host); | |
896 | } | |
897 | ||
778e277c MW |
898 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
899 | { | |
900 | mmc_host_clk_hold(host); | |
901 | __mmc_set_clock(host, hz); | |
902 | mmc_host_clk_release(host); | |
903 | } | |
904 | ||
04566831 LW |
905 | #ifdef CONFIG_MMC_CLKGATE |
906 | /* | |
907 | * This gates the clock by setting it to 0 Hz. | |
908 | */ | |
909 | void mmc_gate_clock(struct mmc_host *host) | |
910 | { | |
911 | unsigned long flags; | |
912 | ||
913 | spin_lock_irqsave(&host->clk_lock, flags); | |
914 | host->clk_old = host->ios.clock; | |
915 | host->ios.clock = 0; | |
916 | host->clk_gated = true; | |
917 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
918 | mmc_set_ios(host); | |
919 | } | |
920 | ||
921 | /* | |
922 | * This restores the clock from gating by using the cached | |
923 | * clock value. | |
924 | */ | |
925 | void mmc_ungate_clock(struct mmc_host *host) | |
926 | { | |
927 | /* | |
928 | * We should previously have gated the clock, so the clock shall | |
929 | * be 0 here! The clock may however be 0 during initialization, | |
930 | * when some request operations are performed before setting | |
931 | * the frequency. When ungate is requested in that situation | |
932 | * we just ignore the call. | |
933 | */ | |
934 | if (host->clk_old) { | |
935 | BUG_ON(host->ios.clock); | |
936 | /* This call will also set host->clk_gated to false */ | |
778e277c | 937 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
938 | } |
939 | } | |
940 | ||
941 | void mmc_set_ungated(struct mmc_host *host) | |
942 | { | |
943 | unsigned long flags; | |
944 | ||
945 | /* | |
946 | * We've been given a new frequency while the clock is gated, | |
947 | * so make sure we regard this as ungating it. | |
948 | */ | |
949 | spin_lock_irqsave(&host->clk_lock, flags); | |
950 | host->clk_gated = false; | |
951 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
952 | } | |
953 | ||
954 | #else | |
955 | void mmc_set_ungated(struct mmc_host *host) | |
956 | { | |
957 | } | |
958 | #endif | |
959 | ||
7ea239d9 PO |
960 | /* |
961 | * Change the bus mode (open drain/push-pull) of a host. | |
962 | */ | |
963 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
964 | { | |
778e277c | 965 | mmc_host_clk_hold(host); |
7ea239d9 PO |
966 | host->ios.bus_mode = mode; |
967 | mmc_set_ios(host); | |
778e277c | 968 | mmc_host_clk_release(host); |
7ea239d9 PO |
969 | } |
970 | ||
0f8d8ea6 AH |
971 | /* |
972 | * Change data bus width of a host. | |
973 | */ | |
974 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
975 | { | |
778e277c | 976 | mmc_host_clk_hold(host); |
4c4cb171 PR |
977 | host->ios.bus_width = width; |
978 | mmc_set_ios(host); | |
778e277c | 979 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
980 | } |
981 | ||
86e8286a AV |
982 | /** |
983 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
984 | * @vdd: voltage (mV) | |
985 | * @low_bits: prefer low bits in boundary cases | |
986 | * | |
987 | * This function returns the OCR bit number according to the provided @vdd | |
988 | * value. If conversion is not possible a negative errno value returned. | |
989 | * | |
990 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
991 | * on boundary voltages. For example, | |
992 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
993 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
994 | * | |
995 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
996 | */ | |
997 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
998 | { | |
999 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1000 | int bit; | |
1001 | ||
1002 | if (vdd < 1650 || vdd > 3600) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | if (vdd >= 1650 && vdd <= 1950) | |
1006 | return ilog2(MMC_VDD_165_195); | |
1007 | ||
1008 | if (low_bits) | |
1009 | vdd -= 1; | |
1010 | ||
1011 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1012 | bit = (vdd - 2000) / 100 + 8; | |
1013 | if (bit > max_bit) | |
1014 | return max_bit; | |
1015 | return bit; | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1020 | * @vdd_min: minimum voltage value (mV) | |
1021 | * @vdd_max: maximum voltage value (mV) | |
1022 | * | |
1023 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1024 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1025 | * | |
1026 | * Notes wrt boundary cases: | |
1027 | * This function sets the OCR bits for all boundary voltages, for example | |
1028 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1029 | * MMC_VDD_34_35 mask. | |
1030 | */ | |
1031 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1032 | { | |
1033 | u32 mask = 0; | |
1034 | ||
1035 | if (vdd_max < vdd_min) | |
1036 | return 0; | |
1037 | ||
1038 | /* Prefer high bits for the boundary vdd_max values. */ | |
1039 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1040 | if (vdd_max < 0) | |
1041 | return 0; | |
1042 | ||
1043 | /* Prefer low bits for the boundary vdd_min values. */ | |
1044 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1045 | if (vdd_min < 0) | |
1046 | return 0; | |
1047 | ||
1048 | /* Fill the mask, from max bit to min bit. */ | |
1049 | while (vdd_max >= vdd_min) | |
1050 | mask |= 1 << vdd_max--; | |
1051 | ||
1052 | return mask; | |
1053 | } | |
1054 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1055 | ||
5c13941a DB |
1056 | #ifdef CONFIG_REGULATOR |
1057 | ||
1058 | /** | |
1059 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1060 | * @supply: regulator to use | |
1061 | * | |
1062 | * This returns either a negative errno, or a mask of voltages that | |
1063 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1064 | * regulator. This would normally be called before registering the | |
1065 | * MMC host adapter. | |
1066 | */ | |
1067 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1068 | { | |
1069 | int result = 0; | |
1070 | int count; | |
1071 | int i; | |
1072 | ||
1073 | count = regulator_count_voltages(supply); | |
1074 | if (count < 0) | |
1075 | return count; | |
1076 | ||
1077 | for (i = 0; i < count; i++) { | |
1078 | int vdd_uV; | |
1079 | int vdd_mV; | |
1080 | ||
1081 | vdd_uV = regulator_list_voltage(supply, i); | |
1082 | if (vdd_uV <= 0) | |
1083 | continue; | |
1084 | ||
1085 | vdd_mV = vdd_uV / 1000; | |
1086 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1087 | } | |
1088 | ||
1089 | return result; | |
1090 | } | |
45a6b32e | 1091 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1092 | |
1093 | /** | |
1094 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1095 | * @mmc: the host to regulate |
5c13941a | 1096 | * @supply: regulator to use |
99fc5131 | 1097 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1098 | * |
1099 | * Returns zero on success, else negative errno. | |
1100 | * | |
1101 | * MMC host drivers may use this to enable or disable a regulator using | |
1102 | * a particular supply voltage. This would normally be called from the | |
1103 | * set_ios() method. | |
1104 | */ | |
99fc5131 LW |
1105 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1106 | struct regulator *supply, | |
1107 | unsigned short vdd_bit) | |
5c13941a DB |
1108 | { |
1109 | int result = 0; | |
1110 | int min_uV, max_uV; | |
5c13941a DB |
1111 | |
1112 | if (vdd_bit) { | |
1113 | int tmp; | |
1114 | int voltage; | |
1115 | ||
9cde5b7a CB |
1116 | /* |
1117 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
5c13941a DB |
1118 | * bits this regulator doesn't quite support ... don't |
1119 | * be too picky, most cards and regulators are OK with | |
1120 | * a 0.1V range goof (it's a small error percentage). | |
1121 | */ | |
1122 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1123 | if (tmp == 0) { | |
1124 | min_uV = 1650 * 1000; | |
1125 | max_uV = 1950 * 1000; | |
1126 | } else { | |
1127 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1128 | max_uV = min_uV + 100 * 1000; | |
1129 | } | |
1130 | ||
9cde5b7a CB |
1131 | /* |
1132 | * If we're using a fixed/static regulator, don't call | |
1133 | * regulator_set_voltage; it would fail. | |
5c13941a DB |
1134 | */ |
1135 | voltage = regulator_get_voltage(supply); | |
6e8201f5 | 1136 | |
9cde5b7a | 1137 | if (regulator_count_voltages(supply) == 1) |
6e8201f5 JC |
1138 | min_uV = max_uV = voltage; |
1139 | ||
5c13941a DB |
1140 | if (voltage < 0) |
1141 | result = voltage; | |
1142 | else if (voltage < min_uV || voltage > max_uV) | |
1143 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
1144 | else | |
1145 | result = 0; | |
1146 | ||
99fc5131 | 1147 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1148 | result = regulator_enable(supply); |
99fc5131 LW |
1149 | if (!result) |
1150 | mmc->regulator_enabled = true; | |
1151 | } | |
1152 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1153 | result = regulator_disable(supply); |
99fc5131 LW |
1154 | if (result == 0) |
1155 | mmc->regulator_enabled = false; | |
5c13941a DB |
1156 | } |
1157 | ||
99fc5131 LW |
1158 | if (result) |
1159 | dev_err(mmc_dev(mmc), | |
1160 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1161 | return result; |
1162 | } | |
45a6b32e | 1163 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1164 | |
e137788d GL |
1165 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1166 | { | |
1167 | struct device *dev = mmc_dev(mmc); | |
1168 | struct regulator *supply; | |
1169 | int ret; | |
1170 | ||
1171 | supply = devm_regulator_get(dev, "vmmc"); | |
1172 | mmc->supply.vmmc = supply; | |
1173 | mmc->supply.vqmmc = devm_regulator_get(dev, "vqmmc"); | |
1174 | ||
1175 | if (IS_ERR(supply)) | |
1176 | return PTR_ERR(supply); | |
1177 | ||
1178 | ret = mmc_regulator_get_ocrmask(supply); | |
1179 | if (ret > 0) | |
1180 | mmc->ocr_avail = ret; | |
1181 | else | |
1182 | dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret); | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1187 | ||
99fc5131 | 1188 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1189 | |
1da177e4 LT |
1190 | /* |
1191 | * Mask off any voltages we don't support and select | |
1192 | * the lowest voltage | |
1193 | */ | |
7ea239d9 | 1194 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1195 | { |
1196 | int bit; | |
1197 | ||
1198 | ocr &= host->ocr_avail; | |
1199 | ||
1200 | bit = ffs(ocr); | |
1201 | if (bit) { | |
1202 | bit -= 1; | |
1203 | ||
63ef731a | 1204 | ocr &= 3 << bit; |
1da177e4 | 1205 | |
778e277c | 1206 | mmc_host_clk_hold(host); |
1da177e4 | 1207 | host->ios.vdd = bit; |
920e70c5 | 1208 | mmc_set_ios(host); |
778e277c | 1209 | mmc_host_clk_release(host); |
1da177e4 | 1210 | } else { |
f6e10b86 DB |
1211 | pr_warning("%s: host doesn't support card's voltages\n", |
1212 | mmc_hostname(host)); | |
1da177e4 LT |
1213 | ocr = 0; |
1214 | } | |
1215 | ||
1216 | return ocr; | |
1217 | } | |
1218 | ||
261bbd46 | 1219 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11) |
f2119df6 AN |
1220 | { |
1221 | struct mmc_command cmd = {0}; | |
1222 | int err = 0; | |
1223 | ||
1224 | BUG_ON(!host); | |
1225 | ||
1226 | /* | |
1227 | * Send CMD11 only if the request is to switch the card to | |
1228 | * 1.8V signalling. | |
1229 | */ | |
261bbd46 | 1230 | if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) { |
f2119df6 AN |
1231 | cmd.opcode = SD_SWITCH_VOLTAGE; |
1232 | cmd.arg = 0; | |
1233 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1234 | ||
1235 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1236 | if (err) | |
1237 | return err; | |
1238 | ||
1239 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1240 | return -EIO; | |
1241 | } | |
1242 | ||
1243 | host->ios.signal_voltage = signal_voltage; | |
1244 | ||
2c4967f7 SRT |
1245 | if (host->ops->start_signal_voltage_switch) { |
1246 | mmc_host_clk_hold(host); | |
f2119df6 | 1247 | err = host->ops->start_signal_voltage_switch(host, &host->ios); |
2c4967f7 SRT |
1248 | mmc_host_clk_release(host); |
1249 | } | |
f2119df6 AN |
1250 | |
1251 | return err; | |
1252 | } | |
1253 | ||
b57c43ad | 1254 | /* |
7ea239d9 | 1255 | * Select timing parameters for host. |
b57c43ad | 1256 | */ |
7ea239d9 | 1257 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1258 | { |
778e277c | 1259 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1260 | host->ios.timing = timing; |
1261 | mmc_set_ios(host); | |
778e277c | 1262 | mmc_host_clk_release(host); |
b57c43ad PO |
1263 | } |
1264 | ||
d6d50a15 AN |
1265 | /* |
1266 | * Select appropriate driver type for host. | |
1267 | */ | |
1268 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1269 | { | |
778e277c | 1270 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1271 | host->ios.drv_type = drv_type; |
1272 | mmc_set_ios(host); | |
778e277c | 1273 | mmc_host_clk_release(host); |
d6d50a15 AN |
1274 | } |
1275 | ||
1da177e4 | 1276 | /* |
45f8245b RK |
1277 | * Apply power to the MMC stack. This is a two-stage process. |
1278 | * First, we enable power to the card without the clock running. | |
1279 | * We then wait a bit for the power to stabilise. Finally, | |
1280 | * enable the bus drivers and clock to the card. | |
1281 | * | |
1282 | * We must _NOT_ enable the clock prior to power stablising. | |
1283 | * | |
1284 | * If a host does all the power sequencing itself, ignore the | |
1285 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
1286 | */ |
1287 | static void mmc_power_up(struct mmc_host *host) | |
1288 | { | |
500f3564 BR |
1289 | int bit; |
1290 | ||
fa550189 UH |
1291 | if (host->ios.power_mode == MMC_POWER_ON) |
1292 | return; | |
1293 | ||
778e277c MW |
1294 | mmc_host_clk_hold(host); |
1295 | ||
500f3564 BR |
1296 | /* If ocr is set, we use it */ |
1297 | if (host->ocr) | |
1298 | bit = ffs(host->ocr) - 1; | |
1299 | else | |
1300 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1301 | |
1302 | host->ios.vdd = bit; | |
44669034 | 1303 | if (mmc_host_is_spi(host)) |
af517150 | 1304 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1305 | else |
af517150 | 1306 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1307 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1308 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1309 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1310 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1311 | mmc_set_ios(host); |
1da177e4 | 1312 | |
108ecc4c AL |
1313 | /* Set signal voltage to 3.3V */ |
1314 | mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false); | |
1315 | ||
f9996aee PO |
1316 | /* |
1317 | * This delay should be sufficient to allow the power supply | |
1318 | * to reach the minimum voltage. | |
1319 | */ | |
79bccc5a | 1320 | mmc_delay(10); |
1da177e4 | 1321 | |
88ae8b86 | 1322 | host->ios.clock = host->f_init; |
8dfd0374 | 1323 | |
1da177e4 | 1324 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1325 | mmc_set_ios(host); |
1da177e4 | 1326 | |
f9996aee PO |
1327 | /* |
1328 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1329 | * time required to reach a stable voltage. | |
1330 | */ | |
79bccc5a | 1331 | mmc_delay(10); |
778e277c MW |
1332 | |
1333 | mmc_host_clk_release(host); | |
1da177e4 LT |
1334 | } |
1335 | ||
7f7e4129 | 1336 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1337 | { |
fa550189 UH |
1338 | if (host->ios.power_mode == MMC_POWER_OFF) |
1339 | return; | |
1340 | ||
778e277c MW |
1341 | mmc_host_clk_hold(host); |
1342 | ||
1da177e4 LT |
1343 | host->ios.clock = 0; |
1344 | host->ios.vdd = 0; | |
b33d46c3 | 1345 | |
bec8726a | 1346 | |
b33d46c3 UH |
1347 | /* |
1348 | * Reset ocr mask to be the highest possible voltage supported for | |
1349 | * this mmc host. This value will be used at next power up. | |
1350 | */ | |
1351 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1352 | ||
af517150 DB |
1353 | if (!mmc_host_is_spi(host)) { |
1354 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1355 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1356 | } | |
1da177e4 | 1357 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1358 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1359 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1360 | mmc_set_ios(host); |
778e277c | 1361 | |
041beb1d DD |
1362 | /* |
1363 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1364 | * XO-1.5, require a short delay after poweroff before the card | |
1365 | * can be successfully turned on again. | |
1366 | */ | |
1367 | mmc_delay(1); | |
1368 | ||
778e277c | 1369 | mmc_host_clk_release(host); |
1da177e4 LT |
1370 | } |
1371 | ||
39361851 AB |
1372 | /* |
1373 | * Cleanup when the last reference to the bus operator is dropped. | |
1374 | */ | |
261172fd | 1375 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1376 | { |
1377 | BUG_ON(!host); | |
1378 | BUG_ON(host->bus_refs); | |
1379 | BUG_ON(!host->bus_dead); | |
1380 | ||
1381 | host->bus_ops = NULL; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * Increase reference count of bus operator | |
1386 | */ | |
1387 | static inline void mmc_bus_get(struct mmc_host *host) | |
1388 | { | |
1389 | unsigned long flags; | |
1390 | ||
1391 | spin_lock_irqsave(&host->lock, flags); | |
1392 | host->bus_refs++; | |
1393 | spin_unlock_irqrestore(&host->lock, flags); | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Decrease reference count of bus operator and free it if | |
1398 | * it is the last reference. | |
1399 | */ | |
1400 | static inline void mmc_bus_put(struct mmc_host *host) | |
1401 | { | |
1402 | unsigned long flags; | |
1403 | ||
1404 | spin_lock_irqsave(&host->lock, flags); | |
1405 | host->bus_refs--; | |
1406 | if ((host->bus_refs == 0) && host->bus_ops) | |
1407 | __mmc_release_bus(host); | |
1408 | spin_unlock_irqrestore(&host->lock, flags); | |
1409 | } | |
1410 | ||
1da177e4 | 1411 | /* |
7ea239d9 PO |
1412 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1413 | * host at any given time. | |
1da177e4 | 1414 | */ |
7ea239d9 | 1415 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1416 | { |
7ea239d9 | 1417 | unsigned long flags; |
e45a1bd2 | 1418 | |
7ea239d9 PO |
1419 | BUG_ON(!host); |
1420 | BUG_ON(!ops); | |
b855885e | 1421 | |
d84075c8 | 1422 | WARN_ON(!host->claimed); |
bce40a36 | 1423 | |
7ea239d9 | 1424 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1425 | |
7ea239d9 PO |
1426 | BUG_ON(host->bus_ops); |
1427 | BUG_ON(host->bus_refs); | |
b57c43ad | 1428 | |
7ea239d9 PO |
1429 | host->bus_ops = ops; |
1430 | host->bus_refs = 1; | |
1431 | host->bus_dead = 0; | |
b57c43ad | 1432 | |
7ea239d9 | 1433 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1434 | } |
1435 | ||
7ea239d9 | 1436 | /* |
7f7e4129 | 1437 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1438 | */ |
1439 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1440 | { |
7ea239d9 | 1441 | unsigned long flags; |
7ccd266e | 1442 | |
7ea239d9 | 1443 | BUG_ON(!host); |
7ccd266e | 1444 | |
d84075c8 PO |
1445 | WARN_ON(!host->claimed); |
1446 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1447 | |
7ea239d9 | 1448 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1449 | |
7ea239d9 | 1450 | host->bus_dead = 1; |
7ccd266e | 1451 | |
7ea239d9 | 1452 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1453 | |
7ea239d9 | 1454 | mmc_bus_put(host); |
1da177e4 LT |
1455 | } |
1456 | ||
1da177e4 LT |
1457 | /** |
1458 | * mmc_detect_change - process change of state on a MMC socket | |
1459 | * @host: host which changed state. | |
8dc00335 | 1460 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1461 | * |
67a61c48 PO |
1462 | * MMC drivers should call this when they detect a card has been |
1463 | * inserted or removed. The MMC layer will confirm that any | |
1464 | * present card is still functional, and initialize any newly | |
1465 | * inserted. | |
1da177e4 | 1466 | */ |
8dc00335 | 1467 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1468 | { |
3b91e550 | 1469 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1470 | unsigned long flags; |
01f41ec7 | 1471 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1472 | WARN_ON(host->removed); |
01f41ec7 | 1473 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 1474 | #endif |
d3049504 | 1475 | host->detect_change = 1; |
c4028958 | 1476 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1477 | } |
1478 | ||
1479 | EXPORT_SYMBOL(mmc_detect_change); | |
1480 | ||
dfe86cba AH |
1481 | void mmc_init_erase(struct mmc_card *card) |
1482 | { | |
1483 | unsigned int sz; | |
1484 | ||
1485 | if (is_power_of_2(card->erase_size)) | |
1486 | card->erase_shift = ffs(card->erase_size) - 1; | |
1487 | else | |
1488 | card->erase_shift = 0; | |
1489 | ||
1490 | /* | |
1491 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1492 | * card. That is not desirable because it can take a long time | |
1493 | * (minutes) potentially delaying more important I/O, and also the | |
1494 | * timeout calculations become increasingly hugely over-estimated. | |
1495 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1496 | * to that size and alignment. | |
1497 | * | |
1498 | * For SD cards that define Allocation Unit size, limit erases to one | |
1499 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1500 | * Erase Size, whether it is switched on or not, limit to that size. | |
1501 | * Otherwise just have a stab at a good value. For modern cards it | |
1502 | * will end up being 4MiB. Note that if the value is too small, it | |
1503 | * can end up taking longer to erase. | |
1504 | */ | |
1505 | if (mmc_card_sd(card) && card->ssr.au) { | |
1506 | card->pref_erase = card->ssr.au; | |
1507 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1508 | } else if (card->ext_csd.hc_erase_size) { | |
1509 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1510 | } else { | |
1511 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1512 | if (sz < 128) | |
1513 | card->pref_erase = 512 * 1024 / 512; | |
1514 | else if (sz < 512) | |
1515 | card->pref_erase = 1024 * 1024 / 512; | |
1516 | else if (sz < 1024) | |
1517 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1518 | else | |
1519 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1520 | if (card->pref_erase < card->erase_size) | |
1521 | card->pref_erase = card->erase_size; | |
1522 | else { | |
1523 | sz = card->pref_erase % card->erase_size; | |
1524 | if (sz) | |
1525 | card->pref_erase += card->erase_size - sz; | |
1526 | } | |
1527 | } | |
1528 | } | |
1529 | ||
eaa02f75 AW |
1530 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1531 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1532 | { |
1533 | unsigned int erase_timeout; | |
1534 | ||
7194efb8 AH |
1535 | if (arg == MMC_DISCARD_ARG || |
1536 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
1537 | erase_timeout = card->ext_csd.trim_timeout; | |
1538 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
1539 | /* High Capacity Erase Group Size uses HC timeouts */ |
1540 | if (arg == MMC_TRIM_ARG) | |
1541 | erase_timeout = card->ext_csd.trim_timeout; | |
1542 | else | |
1543 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1544 | } else { | |
1545 | /* CSD Erase Group Size uses write timeout */ | |
1546 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1547 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1548 | unsigned int timeout_us; | |
1549 | ||
1550 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1551 | if (card->csd.tacc_ns < 1000000) | |
1552 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1553 | else | |
1554 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1555 | ||
1556 | /* | |
1557 | * ios.clock is only a target. The real clock rate might be | |
1558 | * less but not that much less, so fudge it by multiplying by 2. | |
1559 | */ | |
1560 | timeout_clks <<= 1; | |
1561 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1562 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1563 | |
1564 | erase_timeout = timeout_us / 1000; | |
1565 | ||
1566 | /* | |
1567 | * Theoretically, the calculation could underflow so round up | |
1568 | * to 1ms in that case. | |
1569 | */ | |
1570 | if (!erase_timeout) | |
1571 | erase_timeout = 1; | |
1572 | } | |
1573 | ||
1574 | /* Multiplier for secure operations */ | |
1575 | if (arg & MMC_SECURE_ARGS) { | |
1576 | if (arg == MMC_SECURE_ERASE_ARG) | |
1577 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1578 | else | |
1579 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1580 | } | |
1581 | ||
1582 | erase_timeout *= qty; | |
1583 | ||
1584 | /* | |
1585 | * Ensure at least a 1 second timeout for SPI as per | |
1586 | * 'mmc_set_data_timeout()' | |
1587 | */ | |
1588 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1589 | erase_timeout = 1000; | |
1590 | ||
eaa02f75 | 1591 | return erase_timeout; |
dfe86cba AH |
1592 | } |
1593 | ||
eaa02f75 AW |
1594 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1595 | unsigned int arg, | |
1596 | unsigned int qty) | |
dfe86cba | 1597 | { |
eaa02f75 AW |
1598 | unsigned int erase_timeout; |
1599 | ||
dfe86cba AH |
1600 | if (card->ssr.erase_timeout) { |
1601 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1602 | erase_timeout = card->ssr.erase_timeout * qty + |
1603 | card->ssr.erase_offset; | |
dfe86cba AH |
1604 | } else { |
1605 | /* | |
1606 | * Erase timeout not specified in SD Status Register (SSR) so | |
1607 | * use 250ms per write block. | |
1608 | */ | |
eaa02f75 | 1609 | erase_timeout = 250 * qty; |
dfe86cba AH |
1610 | } |
1611 | ||
1612 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1613 | if (erase_timeout < 1000) |
1614 | erase_timeout = 1000; | |
1615 | ||
1616 | return erase_timeout; | |
dfe86cba AH |
1617 | } |
1618 | ||
eaa02f75 AW |
1619 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1620 | unsigned int arg, | |
1621 | unsigned int qty) | |
dfe86cba AH |
1622 | { |
1623 | if (mmc_card_sd(card)) | |
eaa02f75 | 1624 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1625 | else |
eaa02f75 | 1626 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1627 | } |
1628 | ||
1629 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1630 | unsigned int to, unsigned int arg) | |
1631 | { | |
1278dba1 | 1632 | struct mmc_command cmd = {0}; |
dfe86cba AH |
1633 | unsigned int qty = 0; |
1634 | int err; | |
1635 | ||
1636 | /* | |
1637 | * qty is used to calculate the erase timeout which depends on how many | |
1638 | * erase groups (or allocation units in SD terminology) are affected. | |
1639 | * We count erasing part of an erase group as one erase group. | |
1640 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1641 | * erase group size is almost certainly also power of 2, but it does not | |
1642 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1643 | * division in that case. SD may not specify an allocation unit size, | |
1644 | * in which case the timeout is based on the number of write blocks. | |
1645 | * | |
1646 | * Note that the timeout for secure trim 2 will only be correct if the | |
1647 | * number of erase groups specified is the same as the total of all | |
1648 | * preceding secure trim 1 commands. Since the power may have been | |
1649 | * lost since the secure trim 1 commands occurred, it is generally | |
1650 | * impossible to calculate the secure trim 2 timeout correctly. | |
1651 | */ | |
1652 | if (card->erase_shift) | |
1653 | qty += ((to >> card->erase_shift) - | |
1654 | (from >> card->erase_shift)) + 1; | |
1655 | else if (mmc_card_sd(card)) | |
1656 | qty += to - from + 1; | |
1657 | else | |
1658 | qty += ((to / card->erase_size) - | |
1659 | (from / card->erase_size)) + 1; | |
1660 | ||
1661 | if (!mmc_card_blockaddr(card)) { | |
1662 | from <<= 9; | |
1663 | to <<= 9; | |
1664 | } | |
1665 | ||
dfe86cba AH |
1666 | if (mmc_card_sd(card)) |
1667 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1668 | else | |
1669 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1670 | cmd.arg = from; | |
1671 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1672 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1673 | if (err) { | |
a3c76eb9 | 1674 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 1675 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 1676 | err = -EIO; |
dfe86cba AH |
1677 | goto out; |
1678 | } | |
1679 | ||
1680 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1681 | if (mmc_card_sd(card)) | |
1682 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1683 | else | |
1684 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1685 | cmd.arg = to; | |
1686 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1687 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1688 | if (err) { | |
a3c76eb9 | 1689 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 1690 | err, cmd.resp[0]); |
67716327 | 1691 | err = -EIO; |
dfe86cba AH |
1692 | goto out; |
1693 | } | |
1694 | ||
1695 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1696 | cmd.opcode = MMC_ERASE; | |
1697 | cmd.arg = arg; | |
1698 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1699 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1700 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1701 | if (err) { | |
a3c76eb9 | 1702 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
1703 | err, cmd.resp[0]); |
1704 | err = -EIO; | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1708 | if (mmc_host_is_spi(card->host)) | |
1709 | goto out; | |
1710 | ||
1711 | do { | |
1712 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1713 | cmd.opcode = MMC_SEND_STATUS; | |
1714 | cmd.arg = card->rca << 16; | |
1715 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1716 | /* Do not retry else we can't see errors */ | |
1717 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1718 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 1719 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
1720 | err, cmd.resp[0]); |
1721 | err = -EIO; | |
1722 | goto out; | |
1723 | } | |
1724 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
7435bb79 | 1725 | R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG); |
dfe86cba AH |
1726 | out: |
1727 | return err; | |
1728 | } | |
1729 | ||
1730 | /** | |
1731 | * mmc_erase - erase sectors. | |
1732 | * @card: card to erase | |
1733 | * @from: first sector to erase | |
1734 | * @nr: number of sectors to erase | |
1735 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1736 | * | |
1737 | * Caller must claim host before calling this function. | |
1738 | */ | |
1739 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1740 | unsigned int arg) | |
1741 | { | |
1742 | unsigned int rem, to = from + nr; | |
1743 | ||
1744 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1745 | !(card->csd.cmdclass & CCC_ERASE)) | |
1746 | return -EOPNOTSUPP; | |
1747 | ||
1748 | if (!card->erase_size) | |
1749 | return -EOPNOTSUPP; | |
1750 | ||
1751 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1752 | return -EOPNOTSUPP; | |
1753 | ||
1754 | if ((arg & MMC_SECURE_ARGS) && | |
1755 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1756 | return -EOPNOTSUPP; | |
1757 | ||
1758 | if ((arg & MMC_TRIM_ARGS) && | |
1759 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1760 | return -EOPNOTSUPP; | |
1761 | ||
1762 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1763 | if (from % card->erase_size || nr % card->erase_size) | |
1764 | return -EINVAL; | |
1765 | } | |
1766 | ||
1767 | if (arg == MMC_ERASE_ARG) { | |
1768 | rem = from % card->erase_size; | |
1769 | if (rem) { | |
1770 | rem = card->erase_size - rem; | |
1771 | from += rem; | |
1772 | if (nr > rem) | |
1773 | nr -= rem; | |
1774 | else | |
1775 | return 0; | |
1776 | } | |
1777 | rem = nr % card->erase_size; | |
1778 | if (rem) | |
1779 | nr -= rem; | |
1780 | } | |
1781 | ||
1782 | if (nr == 0) | |
1783 | return 0; | |
1784 | ||
1785 | to = from + nr; | |
1786 | ||
1787 | if (to <= from) | |
1788 | return -EINVAL; | |
1789 | ||
1790 | /* 'from' and 'to' are inclusive */ | |
1791 | to -= 1; | |
1792 | ||
1793 | return mmc_do_erase(card, from, to, arg); | |
1794 | } | |
1795 | EXPORT_SYMBOL(mmc_erase); | |
1796 | ||
1797 | int mmc_can_erase(struct mmc_card *card) | |
1798 | { | |
1799 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1800 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1801 | return 1; | |
1802 | return 0; | |
1803 | } | |
1804 | EXPORT_SYMBOL(mmc_can_erase); | |
1805 | ||
1806 | int mmc_can_trim(struct mmc_card *card) | |
1807 | { | |
1808 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
1809 | return 1; | |
1810 | return 0; | |
1811 | } | |
1812 | EXPORT_SYMBOL(mmc_can_trim); | |
1813 | ||
b3bf9153 KP |
1814 | int mmc_can_discard(struct mmc_card *card) |
1815 | { | |
1816 | /* | |
1817 | * As there's no way to detect the discard support bit at v4.5 | |
1818 | * use the s/w feature support filed. | |
1819 | */ | |
1820 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
1821 | return 1; | |
1822 | return 0; | |
1823 | } | |
1824 | EXPORT_SYMBOL(mmc_can_discard); | |
1825 | ||
d9ddd629 KP |
1826 | int mmc_can_sanitize(struct mmc_card *card) |
1827 | { | |
28302812 AH |
1828 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
1829 | return 0; | |
d9ddd629 KP |
1830 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
1831 | return 1; | |
1832 | return 0; | |
1833 | } | |
1834 | EXPORT_SYMBOL(mmc_can_sanitize); | |
1835 | ||
dfe86cba AH |
1836 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
1837 | { | |
1838 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
1839 | return 1; | |
1840 | return 0; | |
1841 | } | |
1842 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
1843 | ||
1844 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
1845 | unsigned int nr) | |
1846 | { | |
1847 | if (!card->erase_size) | |
1848 | return 0; | |
1849 | if (from % card->erase_size || nr % card->erase_size) | |
1850 | return 0; | |
1851 | return 1; | |
1852 | } | |
1853 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 1854 | |
e056a1b5 AH |
1855 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
1856 | unsigned int arg) | |
1857 | { | |
1858 | struct mmc_host *host = card->host; | |
1859 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
1860 | unsigned int last_timeout = 0; | |
1861 | ||
1862 | if (card->erase_shift) | |
1863 | max_qty = UINT_MAX >> card->erase_shift; | |
1864 | else if (mmc_card_sd(card)) | |
1865 | max_qty = UINT_MAX; | |
1866 | else | |
1867 | max_qty = UINT_MAX / card->erase_size; | |
1868 | ||
1869 | /* Find the largest qty with an OK timeout */ | |
1870 | do { | |
1871 | y = 0; | |
1872 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
1873 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
1874 | if (timeout > host->max_discard_to) | |
1875 | break; | |
1876 | if (timeout < last_timeout) | |
1877 | break; | |
1878 | last_timeout = timeout; | |
1879 | y = x; | |
1880 | } | |
1881 | qty += y; | |
1882 | } while (y); | |
1883 | ||
1884 | if (!qty) | |
1885 | return 0; | |
1886 | ||
1887 | if (qty == 1) | |
1888 | return 1; | |
1889 | ||
1890 | /* Convert qty to sectors */ | |
1891 | if (card->erase_shift) | |
1892 | max_discard = --qty << card->erase_shift; | |
1893 | else if (mmc_card_sd(card)) | |
1894 | max_discard = qty; | |
1895 | else | |
1896 | max_discard = --qty * card->erase_size; | |
1897 | ||
1898 | return max_discard; | |
1899 | } | |
1900 | ||
1901 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
1902 | { | |
1903 | struct mmc_host *host = card->host; | |
1904 | unsigned int max_discard, max_trim; | |
1905 | ||
1906 | if (!host->max_discard_to) | |
1907 | return UINT_MAX; | |
1908 | ||
1909 | /* | |
1910 | * Without erase_group_def set, MMC erase timeout depends on clock | |
1911 | * frequence which can change. In that case, the best choice is | |
1912 | * just the preferred erase size. | |
1913 | */ | |
1914 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
1915 | return card->pref_erase; | |
1916 | ||
1917 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
1918 | if (mmc_can_trim(card)) { | |
1919 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
1920 | if (max_trim < max_discard) | |
1921 | max_discard = max_trim; | |
1922 | } else if (max_discard < card->erase_size) { | |
1923 | max_discard = 0; | |
1924 | } | |
1925 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
1926 | mmc_hostname(host), max_discard, host->max_discard_to); | |
1927 | return max_discard; | |
1928 | } | |
1929 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
1930 | ||
0f8d8ea6 AH |
1931 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
1932 | { | |
1278dba1 | 1933 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
1934 | |
1935 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
1936 | return 0; | |
1937 | ||
0f8d8ea6 AH |
1938 | cmd.opcode = MMC_SET_BLOCKLEN; |
1939 | cmd.arg = blocklen; | |
1940 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1941 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
1942 | } | |
1943 | EXPORT_SYMBOL(mmc_set_blocklen); | |
1944 | ||
b2499518 AH |
1945 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
1946 | { | |
1947 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
1948 | return; | |
1949 | mmc_host_clk_hold(host); | |
1950 | host->ops->hw_reset(host); | |
1951 | mmc_host_clk_release(host); | |
1952 | } | |
1953 | ||
1954 | int mmc_can_reset(struct mmc_card *card) | |
1955 | { | |
1956 | u8 rst_n_function; | |
1957 | ||
1958 | if (!mmc_card_mmc(card)) | |
1959 | return 0; | |
1960 | rst_n_function = card->ext_csd.rst_n_function; | |
1961 | if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED) | |
1962 | return 0; | |
1963 | return 1; | |
1964 | } | |
1965 | EXPORT_SYMBOL(mmc_can_reset); | |
1966 | ||
1967 | static int mmc_do_hw_reset(struct mmc_host *host, int check) | |
1968 | { | |
1969 | struct mmc_card *card = host->card; | |
1970 | ||
1971 | if (!host->bus_ops->power_restore) | |
1972 | return -EOPNOTSUPP; | |
1973 | ||
1974 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
1975 | return -EOPNOTSUPP; | |
1976 | ||
1977 | if (!card) | |
1978 | return -EINVAL; | |
1979 | ||
1980 | if (!mmc_can_reset(card)) | |
1981 | return -EOPNOTSUPP; | |
1982 | ||
1983 | mmc_host_clk_hold(host); | |
1984 | mmc_set_clock(host, host->f_init); | |
1985 | ||
1986 | host->ops->hw_reset(host); | |
1987 | ||
1988 | /* If the reset has happened, then a status command will fail */ | |
1989 | if (check) { | |
1990 | struct mmc_command cmd = {0}; | |
1991 | int err; | |
1992 | ||
1993 | cmd.opcode = MMC_SEND_STATUS; | |
1994 | if (!mmc_host_is_spi(card->host)) | |
1995 | cmd.arg = card->rca << 16; | |
1996 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
1997 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1998 | if (!err) { | |
1999 | mmc_host_clk_release(host); | |
2000 | return -ENOSYS; | |
2001 | } | |
2002 | } | |
2003 | ||
2004 | host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR); | |
2005 | if (mmc_host_is_spi(host)) { | |
2006 | host->ios.chip_select = MMC_CS_HIGH; | |
2007 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
2008 | } else { | |
2009 | host->ios.chip_select = MMC_CS_DONTCARE; | |
2010 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
2011 | } | |
2012 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
2013 | host->ios.timing = MMC_TIMING_LEGACY; | |
2014 | mmc_set_ios(host); | |
2015 | ||
2016 | mmc_host_clk_release(host); | |
2017 | ||
2018 | return host->bus_ops->power_restore(host); | |
2019 | } | |
2020 | ||
2021 | int mmc_hw_reset(struct mmc_host *host) | |
2022 | { | |
2023 | return mmc_do_hw_reset(host, 0); | |
2024 | } | |
2025 | EXPORT_SYMBOL(mmc_hw_reset); | |
2026 | ||
2027 | int mmc_hw_reset_check(struct mmc_host *host) | |
2028 | { | |
2029 | return mmc_do_hw_reset(host, 1); | |
2030 | } | |
2031 | EXPORT_SYMBOL(mmc_hw_reset_check); | |
2032 | ||
807e8e40 AR |
2033 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2034 | { | |
2035 | host->f_init = freq; | |
2036 | ||
2037 | #ifdef CONFIG_MMC_DEBUG | |
2038 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2039 | mmc_hostname(host), __func__, host->f_init); | |
2040 | #endif | |
2041 | mmc_power_up(host); | |
2f94e55a | 2042 | |
b2499518 AH |
2043 | /* |
2044 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2045 | * do a hardware reset if possible. | |
2046 | */ | |
2047 | mmc_hw_reset_for_init(host); | |
2048 | ||
2f94e55a PR |
2049 | /* |
2050 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2051 | * if the card is being re-initialized, just send it. CMD52 | |
2052 | * should be ignored by SD/eMMC cards. | |
2053 | */ | |
807e8e40 AR |
2054 | sdio_reset(host); |
2055 | mmc_go_idle(host); | |
2056 | ||
2057 | mmc_send_if_cond(host, host->ocr_avail); | |
2058 | ||
2059 | /* Order's important: probe SDIO, then SD, then MMC */ | |
2060 | if (!mmc_attach_sdio(host)) | |
2061 | return 0; | |
2062 | if (!mmc_attach_sd(host)) | |
2063 | return 0; | |
2064 | if (!mmc_attach_mmc(host)) | |
2065 | return 0; | |
2066 | ||
2067 | mmc_power_off(host); | |
2068 | return -EIO; | |
2069 | } | |
2070 | ||
d3049504 AH |
2071 | int _mmc_detect_card_removed(struct mmc_host *host) |
2072 | { | |
2073 | int ret; | |
2074 | ||
2075 | if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive) | |
2076 | return 0; | |
2077 | ||
2078 | if (!host->card || mmc_card_removed(host->card)) | |
2079 | return 1; | |
2080 | ||
2081 | ret = host->bus_ops->alive(host); | |
2082 | if (ret) { | |
2083 | mmc_card_set_removed(host->card); | |
2084 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2085 | } | |
2086 | ||
2087 | return ret; | |
2088 | } | |
2089 | ||
2090 | int mmc_detect_card_removed(struct mmc_host *host) | |
2091 | { | |
2092 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2093 | int ret; |
d3049504 AH |
2094 | |
2095 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2096 | |
2097 | if (!card) | |
2098 | return 1; | |
2099 | ||
2100 | ret = mmc_card_removed(card); | |
d3049504 AH |
2101 | /* |
2102 | * The card will be considered unchanged unless we have been asked to | |
2103 | * detect a change or host requires polling to provide card detection. | |
2104 | */ | |
f0cc9cf9 UH |
2105 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL) && |
2106 | !(host->caps2 & MMC_CAP2_DETECT_ON_ERR)) | |
2107 | return ret; | |
d3049504 AH |
2108 | |
2109 | host->detect_change = 0; | |
f0cc9cf9 UH |
2110 | if (!ret) { |
2111 | ret = _mmc_detect_card_removed(host); | |
2112 | if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) { | |
2113 | /* | |
2114 | * Schedule a detect work as soon as possible to let a | |
2115 | * rescan handle the card removal. | |
2116 | */ | |
2117 | cancel_delayed_work(&host->detect); | |
2118 | mmc_detect_change(host, 0); | |
2119 | } | |
2120 | } | |
d3049504 | 2121 | |
f0cc9cf9 | 2122 | return ret; |
d3049504 AH |
2123 | } |
2124 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2125 | ||
b93931a6 | 2126 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2127 | { |
c4028958 DH |
2128 | struct mmc_host *host = |
2129 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2130 | int i; |
4c2ef25f | 2131 | |
807e8e40 | 2132 | if (host->rescan_disable) |
4c2ef25f | 2133 | return; |
1da177e4 | 2134 | |
3339d1e3 JR |
2135 | /* If there is a non-removable card registered, only scan once */ |
2136 | if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered) | |
2137 | return; | |
2138 | host->rescan_entered = 1; | |
2139 | ||
7ea239d9 | 2140 | mmc_bus_get(host); |
b855885e | 2141 | |
30201e7f OBC |
2142 | /* |
2143 | * if there is a _removable_ card registered, check whether it is | |
2144 | * still present | |
2145 | */ | |
2146 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 2147 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
2148 | host->bus_ops->detect(host); |
2149 | ||
d3049504 AH |
2150 | host->detect_change = 0; |
2151 | ||
c5841798 CB |
2152 | /* |
2153 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2154 | * the card is no longer present. | |
2155 | */ | |
94d89efb | 2156 | mmc_bus_put(host); |
94d89efb JS |
2157 | mmc_bus_get(host); |
2158 | ||
2159 | /* if there still is a card present, stop here */ | |
2160 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2161 | mmc_bus_put(host); |
94d89efb JS |
2162 | goto out; |
2163 | } | |
1da177e4 | 2164 | |
94d89efb JS |
2165 | /* |
2166 | * Only we can add a new handler, so it's safe to | |
2167 | * release the lock here. | |
2168 | */ | |
2169 | mmc_bus_put(host); | |
1da177e4 | 2170 | |
fa550189 UH |
2171 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) { |
2172 | mmc_claim_host(host); | |
2173 | mmc_power_off(host); | |
2174 | mmc_release_host(host); | |
94d89efb | 2175 | goto out; |
fa550189 | 2176 | } |
1da177e4 | 2177 | |
807e8e40 | 2178 | mmc_claim_host(host); |
88ae8b86 | 2179 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2180 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2181 | break; | |
06b2233a | 2182 | if (freqs[i] <= host->f_min) |
807e8e40 | 2183 | break; |
88ae8b86 | 2184 | } |
807e8e40 AR |
2185 | mmc_release_host(host); |
2186 | ||
2187 | out: | |
28f52482 AV |
2188 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2189 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2190 | } |
2191 | ||
b93931a6 | 2192 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2193 | { |
fa550189 | 2194 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2195 | host->rescan_disable = 0; |
fa550189 | 2196 | mmc_power_up(host); |
b93931a6 | 2197 | mmc_detect_change(host, 0); |
1da177e4 LT |
2198 | } |
2199 | ||
b93931a6 | 2200 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2201 | { |
3b91e550 | 2202 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2203 | unsigned long flags; |
2204 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2205 | host->removed = 1; |
1efd48b3 | 2206 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
2207 | #endif |
2208 | ||
d9adcc12 | 2209 | host->rescan_disable = 1; |
d9bcbf34 | 2210 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
2211 | mmc_flush_scheduled_work(); |
2212 | ||
da68c4eb NP |
2213 | /* clear pm flags now and let card drivers set them as needed */ |
2214 | host->pm_flags = 0; | |
2215 | ||
7ea239d9 PO |
2216 | mmc_bus_get(host); |
2217 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2218 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
7ea239d9 PO |
2219 | if (host->bus_ops->remove) |
2220 | host->bus_ops->remove(host); | |
2221 | ||
2222 | mmc_claim_host(host); | |
2223 | mmc_detach_bus(host); | |
7f7e4129 | 2224 | mmc_power_off(host); |
7ea239d9 | 2225 | mmc_release_host(host); |
53509f0f DK |
2226 | mmc_bus_put(host); |
2227 | return; | |
1da177e4 | 2228 | } |
7ea239d9 PO |
2229 | mmc_bus_put(host); |
2230 | ||
2231 | BUG_ON(host->card); | |
1da177e4 LT |
2232 | |
2233 | mmc_power_off(host); | |
2234 | } | |
2235 | ||
12ae637f | 2236 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2237 | { |
12ae637f OBC |
2238 | int ret = 0; |
2239 | ||
bb9cab94 DD |
2240 | #ifdef CONFIG_MMC_DEBUG |
2241 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2242 | #endif | |
2243 | ||
eae1aeee AH |
2244 | mmc_bus_get(host); |
2245 | ||
2246 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2247 | mmc_bus_put(host); | |
12ae637f | 2248 | return -EINVAL; |
eae1aeee AH |
2249 | } |
2250 | ||
2251 | if (host->bus_ops->power_save) | |
12ae637f | 2252 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2253 | |
2254 | mmc_bus_put(host); | |
2255 | ||
2256 | mmc_power_off(host); | |
12ae637f OBC |
2257 | |
2258 | return ret; | |
eae1aeee AH |
2259 | } |
2260 | EXPORT_SYMBOL(mmc_power_save_host); | |
2261 | ||
12ae637f | 2262 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2263 | { |
12ae637f OBC |
2264 | int ret; |
2265 | ||
bb9cab94 DD |
2266 | #ifdef CONFIG_MMC_DEBUG |
2267 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2268 | #endif | |
2269 | ||
eae1aeee AH |
2270 | mmc_bus_get(host); |
2271 | ||
2272 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2273 | mmc_bus_put(host); | |
12ae637f | 2274 | return -EINVAL; |
eae1aeee AH |
2275 | } |
2276 | ||
2277 | mmc_power_up(host); | |
12ae637f | 2278 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2279 | |
2280 | mmc_bus_put(host); | |
12ae637f OBC |
2281 | |
2282 | return ret; | |
eae1aeee AH |
2283 | } |
2284 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2285 | ||
b1ebe384 JL |
2286 | int mmc_card_awake(struct mmc_host *host) |
2287 | { | |
2288 | int err = -ENOSYS; | |
2289 | ||
aa9df4fb UH |
2290 | if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) |
2291 | return 0; | |
2292 | ||
b1ebe384 JL |
2293 | mmc_bus_get(host); |
2294 | ||
2295 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
2296 | err = host->bus_ops->awake(host); | |
2297 | ||
2298 | mmc_bus_put(host); | |
2299 | ||
2300 | return err; | |
2301 | } | |
2302 | EXPORT_SYMBOL(mmc_card_awake); | |
2303 | ||
2304 | int mmc_card_sleep(struct mmc_host *host) | |
2305 | { | |
2306 | int err = -ENOSYS; | |
2307 | ||
aa9df4fb UH |
2308 | if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) |
2309 | return 0; | |
2310 | ||
b1ebe384 JL |
2311 | mmc_bus_get(host); |
2312 | ||
c99872a1 | 2313 | if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep) |
b1ebe384 JL |
2314 | err = host->bus_ops->sleep(host); |
2315 | ||
2316 | mmc_bus_put(host); | |
2317 | ||
2318 | return err; | |
2319 | } | |
2320 | EXPORT_SYMBOL(mmc_card_sleep); | |
2321 | ||
2322 | int mmc_card_can_sleep(struct mmc_host *host) | |
2323 | { | |
2324 | struct mmc_card *card = host->card; | |
2325 | ||
2326 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
2327 | return 1; | |
2328 | return 0; | |
2329 | } | |
2330 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
2331 | ||
881d1c25 SJ |
2332 | /* |
2333 | * Flush the cache to the non-volatile storage. | |
2334 | */ | |
2335 | int mmc_flush_cache(struct mmc_card *card) | |
2336 | { | |
2337 | struct mmc_host *host = card->host; | |
2338 | int err = 0; | |
2339 | ||
2340 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL)) | |
2341 | return err; | |
2342 | ||
2343 | if (mmc_card_mmc(card) && | |
2344 | (card->ext_csd.cache_size > 0) && | |
2345 | (card->ext_csd.cache_ctrl & 1)) { | |
2346 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2347 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2348 | if (err) | |
2349 | pr_err("%s: cache flush error %d\n", | |
2350 | mmc_hostname(card->host), err); | |
2351 | } | |
2352 | ||
2353 | return err; | |
2354 | } | |
2355 | EXPORT_SYMBOL(mmc_flush_cache); | |
2356 | ||
2357 | /* | |
2358 | * Turn the cache ON/OFF. | |
2359 | * Turning the cache OFF shall trigger flushing of the data | |
2360 | * to the non-volatile storage. | |
2361 | */ | |
2362 | int mmc_cache_ctrl(struct mmc_host *host, u8 enable) | |
2363 | { | |
2364 | struct mmc_card *card = host->card; | |
8bc0678b | 2365 | unsigned int timeout; |
881d1c25 SJ |
2366 | int err = 0; |
2367 | ||
2368 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) || | |
2369 | mmc_card_is_removable(host)) | |
2370 | return err; | |
2371 | ||
7c570919 | 2372 | mmc_claim_host(host); |
881d1c25 SJ |
2373 | if (card && mmc_card_mmc(card) && |
2374 | (card->ext_csd.cache_size > 0)) { | |
2375 | enable = !!enable; | |
2376 | ||
8bc0678b SJ |
2377 | if (card->ext_csd.cache_ctrl ^ enable) { |
2378 | timeout = enable ? card->ext_csd.generic_cmd6_time : 0; | |
881d1c25 | 2379 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
8bc0678b SJ |
2380 | EXT_CSD_CACHE_CTRL, enable, timeout); |
2381 | if (err) | |
2382 | pr_err("%s: cache %s error %d\n", | |
2383 | mmc_hostname(card->host), | |
2384 | enable ? "on" : "off", | |
2385 | err); | |
2386 | else | |
2387 | card->ext_csd.cache_ctrl = enable; | |
2388 | } | |
881d1c25 | 2389 | } |
7c570919 | 2390 | mmc_release_host(host); |
881d1c25 SJ |
2391 | |
2392 | return err; | |
2393 | } | |
2394 | EXPORT_SYMBOL(mmc_cache_ctrl); | |
2395 | ||
1da177e4 LT |
2396 | #ifdef CONFIG_PM |
2397 | ||
2398 | /** | |
2399 | * mmc_suspend_host - suspend a host | |
2400 | * @host: mmc host | |
1da177e4 | 2401 | */ |
1a13f8fa | 2402 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 2403 | { |
95cdfb72 NP |
2404 | int err = 0; |
2405 | ||
7de427d0 | 2406 | cancel_delayed_work(&host->detect); |
b5af25be | 2407 | mmc_flush_scheduled_work(); |
17e9ff55 | 2408 | |
7c570919 | 2409 | err = mmc_cache_ctrl(host, 0); |
881d1c25 SJ |
2410 | if (err) |
2411 | goto out; | |
b5af25be | 2412 | |
7ea239d9 PO |
2413 | mmc_bus_get(host); |
2414 | if (host->bus_ops && !host->bus_dead) { | |
950d56ac JC |
2415 | if (host->bus_ops->suspend) { |
2416 | if (mmc_card_doing_bkops(host->card)) { | |
2417 | err = mmc_stop_bkops(host->card); | |
2418 | if (err) | |
2419 | goto out; | |
2420 | } | |
7c570919 | 2421 | err = host->bus_ops->suspend(host); |
950d56ac | 2422 | } |
49df7807 | 2423 | |
7c570919 UH |
2424 | if (err == -ENOSYS || !host->bus_ops->resume) { |
2425 | /* | |
2426 | * We simply "remove" the card in this case. | |
2427 | * It will be redetected on resume. (Calling | |
2428 | * bus_ops->remove() with a claimed host can | |
2429 | * deadlock.) | |
2430 | */ | |
2431 | if (host->bus_ops->remove) | |
2432 | host->bus_ops->remove(host); | |
2433 | mmc_claim_host(host); | |
2434 | mmc_detach_bus(host); | |
2435 | mmc_power_off(host); | |
2436 | mmc_release_host(host); | |
2437 | host->pm_flags = 0; | |
2438 | err = 0; | |
1c8cf9c9 | 2439 | } |
b5af25be | 2440 | } |
7ea239d9 PO |
2441 | mmc_bus_put(host); |
2442 | ||
a5e9425d | 2443 | if (!err && !mmc_card_keep_power(host)) |
95cdfb72 | 2444 | mmc_power_off(host); |
1da177e4 | 2445 | |
881d1c25 | 2446 | out: |
95cdfb72 | 2447 | return err; |
1da177e4 LT |
2448 | } |
2449 | ||
2450 | EXPORT_SYMBOL(mmc_suspend_host); | |
2451 | ||
2452 | /** | |
2453 | * mmc_resume_host - resume a previously suspended host | |
2454 | * @host: mmc host | |
2455 | */ | |
2456 | int mmc_resume_host(struct mmc_host *host) | |
2457 | { | |
95cdfb72 NP |
2458 | int err = 0; |
2459 | ||
6abaa0c9 PO |
2460 | mmc_bus_get(host); |
2461 | if (host->bus_ops && !host->bus_dead) { | |
a5e9425d | 2462 | if (!mmc_card_keep_power(host)) { |
da68c4eb NP |
2463 | mmc_power_up(host); |
2464 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
2465 | /* |
2466 | * Tell runtime PM core we just powered up the card, | |
2467 | * since it still believes the card is powered off. | |
2468 | * Note that currently runtime PM is only enabled | |
2469 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
2470 | */ | |
2471 | if (mmc_card_sdio(host->card) && | |
2472 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
2473 | pm_runtime_disable(&host->card->dev); | |
2474 | pm_runtime_set_active(&host->card->dev); | |
2475 | pm_runtime_enable(&host->card->dev); | |
2476 | } | |
da68c4eb | 2477 | } |
6abaa0c9 | 2478 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
2479 | err = host->bus_ops->resume(host); |
2480 | if (err) { | |
a3c76eb9 | 2481 | pr_warning("%s: error %d during resume " |
95cdfb72 NP |
2482 | "(card was removed?)\n", |
2483 | mmc_hostname(host), err); | |
95cdfb72 NP |
2484 | err = 0; |
2485 | } | |
6abaa0c9 | 2486 | } |
a8e6df73 | 2487 | host->pm_flags &= ~MMC_PM_KEEP_POWER; |
6abaa0c9 PO |
2488 | mmc_bus_put(host); |
2489 | ||
95cdfb72 | 2490 | return err; |
1da177e4 | 2491 | } |
1da177e4 LT |
2492 | EXPORT_SYMBOL(mmc_resume_host); |
2493 | ||
4c2ef25f ML |
2494 | /* Do the card removal on suspend if card is assumed removeable |
2495 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2496 | to sync the card. | |
2497 | */ | |
2498 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2499 | unsigned long mode, void *unused) | |
2500 | { | |
2501 | struct mmc_host *host = container_of( | |
2502 | notify_block, struct mmc_host, pm_notify); | |
2503 | unsigned long flags; | |
950d56ac | 2504 | int err = 0; |
4c2ef25f ML |
2505 | |
2506 | switch (mode) { | |
2507 | case PM_HIBERNATION_PREPARE: | |
2508 | case PM_SUSPEND_PREPARE: | |
950d56ac JC |
2509 | if (host->card && mmc_card_mmc(host->card) && |
2510 | mmc_card_doing_bkops(host->card)) { | |
2511 | err = mmc_stop_bkops(host->card); | |
2512 | if (err) { | |
2513 | pr_err("%s: didn't stop bkops\n", | |
2514 | mmc_hostname(host)); | |
2515 | return err; | |
2516 | } | |
2517 | mmc_card_clr_doing_bkops(host->card); | |
2518 | } | |
4c2ef25f ML |
2519 | |
2520 | spin_lock_irqsave(&host->lock, flags); | |
2521 | host->rescan_disable = 1; | |
2522 | spin_unlock_irqrestore(&host->lock, flags); | |
2523 | cancel_delayed_work_sync(&host->detect); | |
2524 | ||
2525 | if (!host->bus_ops || host->bus_ops->suspend) | |
2526 | break; | |
2527 | ||
0db13fc2 | 2528 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
4c2ef25f ML |
2529 | if (host->bus_ops->remove) |
2530 | host->bus_ops->remove(host); | |
2531 | ||
0db13fc2 | 2532 | mmc_claim_host(host); |
4c2ef25f | 2533 | mmc_detach_bus(host); |
7f7e4129 | 2534 | mmc_power_off(host); |
4c2ef25f ML |
2535 | mmc_release_host(host); |
2536 | host->pm_flags = 0; | |
2537 | break; | |
2538 | ||
2539 | case PM_POST_SUSPEND: | |
2540 | case PM_POST_HIBERNATION: | |
274476f8 | 2541 | case PM_POST_RESTORE: |
4c2ef25f ML |
2542 | |
2543 | spin_lock_irqsave(&host->lock, flags); | |
2544 | host->rescan_disable = 0; | |
2545 | spin_unlock_irqrestore(&host->lock, flags); | |
2546 | mmc_detect_change(host, 0); | |
2547 | ||
2548 | } | |
2549 | ||
2550 | return 0; | |
2551 | } | |
1da177e4 LT |
2552 | #endif |
2553 | ||
ffce2e7e PO |
2554 | static int __init mmc_init(void) |
2555 | { | |
2556 | int ret; | |
2557 | ||
0d9ee5b2 | 2558 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2559 | if (!workqueue) |
2560 | return -ENOMEM; | |
2561 | ||
2562 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2563 | if (ret) |
2564 | goto destroy_workqueue; | |
2565 | ||
2566 | ret = mmc_register_host_class(); | |
2567 | if (ret) | |
2568 | goto unregister_bus; | |
2569 | ||
2570 | ret = sdio_register_bus(); | |
2571 | if (ret) | |
2572 | goto unregister_host_class; | |
2573 | ||
2574 | return 0; | |
2575 | ||
2576 | unregister_host_class: | |
2577 | mmc_unregister_host_class(); | |
2578 | unregister_bus: | |
2579 | mmc_unregister_bus(); | |
2580 | destroy_workqueue: | |
2581 | destroy_workqueue(workqueue); | |
2582 | ||
ffce2e7e PO |
2583 | return ret; |
2584 | } | |
2585 | ||
2586 | static void __exit mmc_exit(void) | |
2587 | { | |
e29a7d73 | 2588 | sdio_unregister_bus(); |
ffce2e7e PO |
2589 | mmc_unregister_host_class(); |
2590 | mmc_unregister_bus(); | |
2591 | destroy_workqueue(workqueue); | |
2592 | } | |
2593 | ||
26074962 | 2594 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2595 | module_exit(mmc_exit); |
2596 | ||
1da177e4 | 2597 | MODULE_LICENSE("GPL"); |