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> |
bbd43682 | 26 | #include <linux/pm_wakeup.h> |
35eb6db1 | 27 | #include <linux/suspend.h> |
1b676f70 PF |
28 | #include <linux/fault-inject.h> |
29 | #include <linux/random.h> | |
950d56ac | 30 | #include <linux/slab.h> |
6e9e318b | 31 | #include <linux/of.h> |
1da177e4 LT |
32 | |
33 | #include <linux/mmc/card.h> | |
34 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
35 | #include <linux/mmc/mmc.h> |
36 | #include <linux/mmc/sd.h> | |
740a221e | 37 | #include <linux/mmc/slot-gpio.h> |
1da177e4 | 38 | |
7962fc37 BW |
39 | #define CREATE_TRACE_POINTS |
40 | #include <trace/events/mmc.h> | |
41 | ||
aaac1b47 | 42 | #include "core.h" |
ffce2e7e PO |
43 | #include "bus.h" |
44 | #include "host.h" | |
e29a7d73 | 45 | #include "sdio_bus.h" |
3aa8793f | 46 | #include "pwrseq.h" |
da7fbe58 PO |
47 | |
48 | #include "mmc_ops.h" | |
49 | #include "sd_ops.h" | |
5c4e6f13 | 50 | #include "sdio_ops.h" |
1da177e4 | 51 | |
8fee476b TR |
52 | /* If the device is not responding */ |
53 | #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */ | |
54 | ||
950d56ac JC |
55 | /* |
56 | * Background operations can take a long time, depending on the housekeeping | |
57 | * operations the card has to perform. | |
58 | */ | |
59 | #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */ | |
60 | ||
b552e106 UH |
61 | /* The max erase timeout, used when host->max_busy_timeout isn't specified */ |
62 | #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */ | |
63 | ||
fa550189 | 64 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 65 | |
af517150 DB |
66 | /* |
67 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
68 | * performance cost, and for other reasons may not always be desired. | |
69 | * So we allow it it to be disabled. | |
70 | */ | |
90ab5ee9 | 71 | bool use_spi_crc = 1; |
af517150 DB |
72 | module_param(use_spi_crc, bool, 0); |
73 | ||
ffce2e7e PO |
74 | static int mmc_schedule_delayed_work(struct delayed_work *work, |
75 | unsigned long delay) | |
76 | { | |
520bd7a8 UH |
77 | /* |
78 | * We use the system_freezable_wq, because of two reasons. | |
79 | * First, it allows several works (not the same work item) to be | |
80 | * executed simultaneously. Second, the queue becomes frozen when | |
81 | * userspace becomes frozen during system PM. | |
82 | */ | |
83 | return queue_delayed_work(system_freezable_wq, work, delay); | |
ffce2e7e PO |
84 | } |
85 | ||
1b676f70 PF |
86 | #ifdef CONFIG_FAIL_MMC_REQUEST |
87 | ||
88 | /* | |
89 | * Internal function. Inject random data errors. | |
90 | * If mmc_data is NULL no errors are injected. | |
91 | */ | |
92 | static void mmc_should_fail_request(struct mmc_host *host, | |
93 | struct mmc_request *mrq) | |
94 | { | |
95 | struct mmc_command *cmd = mrq->cmd; | |
96 | struct mmc_data *data = mrq->data; | |
97 | static const int data_errors[] = { | |
98 | -ETIMEDOUT, | |
99 | -EILSEQ, | |
100 | -EIO, | |
101 | }; | |
102 | ||
103 | if (!data) | |
104 | return; | |
105 | ||
106 | if (cmd->error || data->error || | |
107 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
108 | return; | |
109 | ||
2e744fcb AM |
110 | data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)]; |
111 | data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9; | |
1b676f70 PF |
112 | } |
113 | ||
114 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
115 | ||
116 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
117 | struct mmc_request *mrq) | |
118 | { | |
119 | } | |
120 | ||
121 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
122 | ||
30137903 AH |
123 | static inline void mmc_complete_cmd(struct mmc_request *mrq) |
124 | { | |
125 | if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion)) | |
126 | complete_all(&mrq->cmd_completion); | |
127 | } | |
128 | ||
129 | void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq) | |
130 | { | |
131 | if (!mrq->cap_cmd_during_tfr) | |
132 | return; | |
133 | ||
134 | mmc_complete_cmd(mrq); | |
135 | ||
136 | pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n", | |
137 | mmc_hostname(host), mrq->cmd->opcode); | |
138 | } | |
139 | EXPORT_SYMBOL(mmc_command_done); | |
140 | ||
1da177e4 | 141 | /** |
fe10c6ab RK |
142 | * mmc_request_done - finish processing an MMC request |
143 | * @host: MMC host which completed request | |
144 | * @mrq: MMC request which request | |
1da177e4 LT |
145 | * |
146 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 147 | * their processing of a request. |
1da177e4 LT |
148 | */ |
149 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
150 | { | |
151 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
152 | int err = cmd->error; |
153 | ||
bd11e8bd | 154 | /* Flag re-tuning needed on CRC errors */ |
031277d4 CJ |
155 | if ((cmd->opcode != MMC_SEND_TUNING_BLOCK && |
156 | cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) && | |
157 | (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) || | |
bd11e8bd | 158 | (mrq->data && mrq->data->error == -EILSEQ) || |
031277d4 | 159 | (mrq->stop && mrq->stop->error == -EILSEQ))) |
bd11e8bd AH |
160 | mmc_retune_needed(host); |
161 | ||
af517150 DB |
162 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
163 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
164 | cmd->retries = 0; | |
165 | } | |
166 | ||
30137903 AH |
167 | if (host->ongoing_mrq == mrq) |
168 | host->ongoing_mrq = NULL; | |
169 | ||
170 | mmc_complete_cmd(mrq); | |
171 | ||
7962fc37 BW |
172 | trace_mmc_request_done(host, mrq); |
173 | ||
d3049504 | 174 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
175 | /* |
176 | * Request starter must handle retries - see | |
177 | * mmc_wait_for_req_done(). | |
178 | */ | |
179 | if (mrq->done) | |
180 | mrq->done(mrq); | |
e4d21708 | 181 | } else { |
1b676f70 PF |
182 | mmc_should_fail_request(host, mrq); |
183 | ||
30137903 AH |
184 | if (!host->ongoing_mrq) |
185 | led_trigger_event(host->led, LED_OFF); | |
af8350c7 | 186 | |
fc75b708 AG |
187 | if (mrq->sbc) { |
188 | pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n", | |
189 | mmc_hostname(host), mrq->sbc->opcode, | |
190 | mrq->sbc->error, | |
191 | mrq->sbc->resp[0], mrq->sbc->resp[1], | |
192 | mrq->sbc->resp[2], mrq->sbc->resp[3]); | |
193 | } | |
194 | ||
e4d21708 PO |
195 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
196 | mmc_hostname(host), cmd->opcode, err, | |
197 | cmd->resp[0], cmd->resp[1], | |
198 | cmd->resp[2], cmd->resp[3]); | |
199 | ||
200 | if (mrq->data) { | |
201 | pr_debug("%s: %d bytes transferred: %d\n", | |
202 | mmc_hostname(host), | |
203 | mrq->data->bytes_xfered, mrq->data->error); | |
204 | } | |
205 | ||
206 | if (mrq->stop) { | |
207 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
208 | mmc_hostname(host), mrq->stop->opcode, | |
209 | mrq->stop->error, | |
210 | mrq->stop->resp[0], mrq->stop->resp[1], | |
211 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
212 | } | |
213 | ||
214 | if (mrq->done) | |
215 | mrq->done(mrq); | |
1da177e4 LT |
216 | } |
217 | } | |
218 | ||
219 | EXPORT_SYMBOL(mmc_request_done); | |
220 | ||
90a81489 AH |
221 | static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
222 | { | |
223 | int err; | |
224 | ||
225 | /* Assumes host controller has been runtime resumed by mmc_claim_host */ | |
226 | err = mmc_retune(host); | |
227 | if (err) { | |
228 | mrq->cmd->error = err; | |
229 | mmc_request_done(host, mrq); | |
230 | return; | |
231 | } | |
232 | ||
5d3f6ef0 HG |
233 | /* |
234 | * For sdio rw commands we must wait for card busy otherwise some | |
235 | * sdio devices won't work properly. | |
236 | */ | |
237 | if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) { | |
238 | int tries = 500; /* Wait aprox 500ms at maximum */ | |
239 | ||
240 | while (host->ops->card_busy(host) && --tries) | |
241 | mmc_delay(1); | |
242 | ||
243 | if (tries == 0) { | |
244 | mrq->cmd->error = -EBUSY; | |
245 | mmc_request_done(host, mrq); | |
246 | return; | |
247 | } | |
248 | } | |
249 | ||
30137903 AH |
250 | if (mrq->cap_cmd_during_tfr) { |
251 | host->ongoing_mrq = mrq; | |
252 | /* | |
253 | * Retry path could come through here without having waiting on | |
254 | * cmd_completion, so ensure it is reinitialised. | |
255 | */ | |
256 | reinit_completion(&mrq->cmd_completion); | |
257 | } | |
258 | ||
7962fc37 BW |
259 | trace_mmc_request_start(host, mrq); |
260 | ||
90a81489 AH |
261 | host->ops->request(host, mrq); |
262 | } | |
263 | ||
f100c1c2 | 264 | static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
1da177e4 | 265 | { |
976d9276 PO |
266 | #ifdef CONFIG_MMC_DEBUG |
267 | unsigned int i, sz; | |
a84756c5 | 268 | struct scatterlist *sg; |
976d9276 | 269 | #endif |
90a81489 AH |
270 | mmc_retune_hold(host); |
271 | ||
f100c1c2 AH |
272 | if (mmc_card_removed(host->card)) |
273 | return -ENOMEDIUM; | |
976d9276 | 274 | |
7b2fd4f2 JC |
275 | if (mrq->sbc) { |
276 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
277 | mmc_hostname(host), mrq->sbc->opcode, | |
278 | mrq->sbc->arg, mrq->sbc->flags); | |
279 | } | |
280 | ||
920e70c5 RK |
281 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
282 | mmc_hostname(host), mrq->cmd->opcode, | |
283 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 284 | |
e4d21708 PO |
285 | if (mrq->data) { |
286 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
287 | "tsac %d ms nsac %d\n", | |
288 | mmc_hostname(host), mrq->data->blksz, | |
289 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 290 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
291 | mrq->data->timeout_clks); |
292 | } | |
293 | ||
294 | if (mrq->stop) { | |
295 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
296 | mmc_hostname(host), mrq->stop->opcode, | |
297 | mrq->stop->arg, mrq->stop->flags); | |
298 | } | |
299 | ||
f22ee4ed | 300 | WARN_ON(!host->claimed); |
1da177e4 LT |
301 | |
302 | mrq->cmd->error = 0; | |
303 | mrq->cmd->mrq = mrq; | |
cce411e6 AG |
304 | if (mrq->sbc) { |
305 | mrq->sbc->error = 0; | |
306 | mrq->sbc->mrq = mrq; | |
307 | } | |
1da177e4 | 308 | if (mrq->data) { |
fe4a3c7a | 309 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
310 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
311 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
312 | host->max_req_size); | |
fe4a3c7a | 313 | |
976d9276 PO |
314 | #ifdef CONFIG_MMC_DEBUG |
315 | sz = 0; | |
a84756c5 PO |
316 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
317 | sz += sg->length; | |
976d9276 PO |
318 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
319 | #endif | |
320 | ||
1da177e4 LT |
321 | mrq->cmd->data = mrq->data; |
322 | mrq->data->error = 0; | |
323 | mrq->data->mrq = mrq; | |
324 | if (mrq->stop) { | |
325 | mrq->data->stop = mrq->stop; | |
326 | mrq->stop->error = 0; | |
327 | mrq->stop->mrq = mrq; | |
328 | } | |
329 | } | |
66c036e0 | 330 | led_trigger_event(host->led, LED_FULL); |
90a81489 | 331 | __mmc_start_request(host, mrq); |
f100c1c2 AH |
332 | |
333 | return 0; | |
1da177e4 LT |
334 | } |
335 | ||
950d56ac JC |
336 | /** |
337 | * mmc_start_bkops - start BKOPS for supported cards | |
338 | * @card: MMC card to start BKOPS | |
339 | * @form_exception: A flag to indicate if this function was | |
340 | * called due to an exception raised by the card | |
341 | * | |
342 | * Start background operations whenever requested. | |
343 | * When the urgent BKOPS bit is set in a R1 command response | |
344 | * then background operations should be started immediately. | |
345 | */ | |
346 | void mmc_start_bkops(struct mmc_card *card, bool from_exception) | |
347 | { | |
348 | int err; | |
349 | int timeout; | |
350 | bool use_busy_signal; | |
351 | ||
352 | BUG_ON(!card); | |
353 | ||
0501be64 | 354 | if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card)) |
950d56ac JC |
355 | return; |
356 | ||
357 | err = mmc_read_bkops_status(card); | |
358 | if (err) { | |
359 | pr_err("%s: Failed to read bkops status: %d\n", | |
360 | mmc_hostname(card->host), err); | |
361 | return; | |
362 | } | |
363 | ||
364 | if (!card->ext_csd.raw_bkops_status) | |
365 | return; | |
366 | ||
367 | if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 && | |
368 | from_exception) | |
369 | return; | |
370 | ||
371 | mmc_claim_host(card->host); | |
372 | if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) { | |
373 | timeout = MMC_BKOPS_MAX_TIMEOUT; | |
374 | use_busy_signal = true; | |
375 | } else { | |
376 | timeout = 0; | |
377 | use_busy_signal = false; | |
378 | } | |
379 | ||
66073d86 AH |
380 | mmc_retune_hold(card->host); |
381 | ||
950d56ac | 382 | err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
4509f847 UH |
383 | EXT_CSD_BKOPS_START, 1, timeout, |
384 | use_busy_signal, true, false); | |
950d56ac JC |
385 | if (err) { |
386 | pr_warn("%s: Error %d starting bkops\n", | |
387 | mmc_hostname(card->host), err); | |
66073d86 | 388 | mmc_retune_release(card->host); |
950d56ac JC |
389 | goto out; |
390 | } | |
391 | ||
392 | /* | |
393 | * For urgent bkops status (LEVEL_2 and more) | |
394 | * bkops executed synchronously, otherwise | |
395 | * the operation is in progress | |
396 | */ | |
397 | if (!use_busy_signal) | |
398 | mmc_card_set_doing_bkops(card); | |
66073d86 AH |
399 | else |
400 | mmc_retune_release(card->host); | |
950d56ac JC |
401 | out: |
402 | mmc_release_host(card->host); | |
403 | } | |
404 | EXPORT_SYMBOL(mmc_start_bkops); | |
405 | ||
2220eedf KD |
406 | /* |
407 | * mmc_wait_data_done() - done callback for data request | |
408 | * @mrq: done data request | |
409 | * | |
410 | * Wakes up mmc context, passed as a callback to host controller driver | |
411 | */ | |
412 | static void mmc_wait_data_done(struct mmc_request *mrq) | |
413 | { | |
71f8a4b8 JF |
414 | struct mmc_context_info *context_info = &mrq->host->context_info; |
415 | ||
416 | context_info->is_done_rcv = true; | |
417 | wake_up_interruptible(&context_info->wait); | |
2220eedf KD |
418 | } |
419 | ||
1da177e4 LT |
420 | static void mmc_wait_done(struct mmc_request *mrq) |
421 | { | |
aa8b683a PF |
422 | complete(&mrq->completion); |
423 | } | |
424 | ||
30137903 AH |
425 | static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host) |
426 | { | |
427 | struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq); | |
428 | ||
429 | /* | |
430 | * If there is an ongoing transfer, wait for the command line to become | |
431 | * available. | |
432 | */ | |
433 | if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion)) | |
434 | wait_for_completion(&ongoing_mrq->cmd_completion); | |
435 | } | |
436 | ||
2220eedf KD |
437 | /* |
438 | *__mmc_start_data_req() - starts data request | |
439 | * @host: MMC host to start the request | |
440 | * @mrq: data request to start | |
441 | * | |
442 | * Sets the done callback to be called when request is completed by the card. | |
443 | * Starts data mmc request execution | |
30137903 AH |
444 | * If an ongoing transfer is already in progress, wait for the command line |
445 | * to become available before sending another command. | |
2220eedf KD |
446 | */ |
447 | static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq) | |
448 | { | |
f100c1c2 AH |
449 | int err; |
450 | ||
30137903 AH |
451 | mmc_wait_ongoing_tfr_cmd(host); |
452 | ||
2220eedf KD |
453 | mrq->done = mmc_wait_data_done; |
454 | mrq->host = host; | |
f100c1c2 | 455 | |
30137903 AH |
456 | init_completion(&mrq->cmd_completion); |
457 | ||
f100c1c2 AH |
458 | err = mmc_start_request(host, mrq); |
459 | if (err) { | |
460 | mrq->cmd->error = err; | |
30137903 | 461 | mmc_complete_cmd(mrq); |
9b844961 | 462 | mmc_wait_data_done(mrq); |
2220eedf | 463 | } |
2220eedf | 464 | |
f100c1c2 | 465 | return err; |
2220eedf KD |
466 | } |
467 | ||
956d9fd5 | 468 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 469 | { |
f100c1c2 AH |
470 | int err; |
471 | ||
30137903 AH |
472 | mmc_wait_ongoing_tfr_cmd(host); |
473 | ||
aa8b683a PF |
474 | init_completion(&mrq->completion); |
475 | mrq->done = mmc_wait_done; | |
f100c1c2 | 476 | |
30137903 AH |
477 | init_completion(&mrq->cmd_completion); |
478 | ||
f100c1c2 AH |
479 | err = mmc_start_request(host, mrq); |
480 | if (err) { | |
481 | mrq->cmd->error = err; | |
30137903 | 482 | mmc_complete_cmd(mrq); |
d3049504 | 483 | complete(&mrq->completion); |
d3049504 | 484 | } |
f100c1c2 AH |
485 | |
486 | return err; | |
aa8b683a PF |
487 | } |
488 | ||
2220eedf KD |
489 | /* |
490 | * mmc_wait_for_data_req_done() - wait for request completed | |
491 | * @host: MMC host to prepare the command. | |
492 | * @mrq: MMC request to wait for | |
493 | * | |
494 | * Blocks MMC context till host controller will ack end of data request | |
495 | * execution or new request notification arrives from the block layer. | |
496 | * Handles command retries. | |
497 | * | |
498 | * Returns enum mmc_blk_status after checking errors. | |
499 | */ | |
500 | static int mmc_wait_for_data_req_done(struct mmc_host *host, | |
501 | struct mmc_request *mrq, | |
502 | struct mmc_async_req *next_req) | |
503 | { | |
504 | struct mmc_command *cmd; | |
505 | struct mmc_context_info *context_info = &host->context_info; | |
506 | int err; | |
507 | unsigned long flags; | |
508 | ||
509 | while (1) { | |
510 | wait_event_interruptible(context_info->wait, | |
511 | (context_info->is_done_rcv || | |
512 | context_info->is_new_req)); | |
513 | spin_lock_irqsave(&context_info->lock, flags); | |
514 | context_info->is_waiting_last_req = false; | |
515 | spin_unlock_irqrestore(&context_info->lock, flags); | |
516 | if (context_info->is_done_rcv) { | |
517 | context_info->is_done_rcv = false; | |
518 | context_info->is_new_req = false; | |
519 | cmd = mrq->cmd; | |
775a9362 | 520 | |
2220eedf KD |
521 | if (!cmd->error || !cmd->retries || |
522 | mmc_card_removed(host->card)) { | |
523 | err = host->areq->err_check(host->card, | |
524 | host->areq); | |
525 | break; /* return err */ | |
526 | } else { | |
90a81489 | 527 | mmc_retune_recheck(host); |
2220eedf KD |
528 | pr_info("%s: req failed (CMD%u): %d, retrying...\n", |
529 | mmc_hostname(host), | |
530 | cmd->opcode, cmd->error); | |
531 | cmd->retries--; | |
532 | cmd->error = 0; | |
90a81489 | 533 | __mmc_start_request(host, mrq); |
2220eedf KD |
534 | continue; /* wait for done/new event again */ |
535 | } | |
536 | } else if (context_info->is_new_req) { | |
537 | context_info->is_new_req = false; | |
90a81489 AH |
538 | if (!next_req) |
539 | return MMC_BLK_NEW_REQUEST; | |
2220eedf KD |
540 | } |
541 | } | |
90a81489 | 542 | mmc_retune_release(host); |
2220eedf KD |
543 | return err; |
544 | } | |
545 | ||
30137903 | 546 | void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 547 | { |
08a7e1df AH |
548 | struct mmc_command *cmd; |
549 | ||
550 | while (1) { | |
551 | wait_for_completion(&mrq->completion); | |
552 | ||
553 | cmd = mrq->cmd; | |
775a9362 ME |
554 | |
555 | /* | |
556 | * If host has timed out waiting for the sanitize | |
557 | * to complete, card might be still in programming state | |
558 | * so let's try to bring the card out of programming | |
559 | * state. | |
560 | */ | |
561 | if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) { | |
562 | if (!mmc_interrupt_hpi(host->card)) { | |
6606110d JP |
563 | pr_warn("%s: %s: Interrupted sanitize\n", |
564 | mmc_hostname(host), __func__); | |
775a9362 ME |
565 | cmd->error = 0; |
566 | break; | |
567 | } else { | |
568 | pr_err("%s: %s: Failed to interrupt sanitize\n", | |
569 | mmc_hostname(host), __func__); | |
570 | } | |
571 | } | |
d3049504 AH |
572 | if (!cmd->error || !cmd->retries || |
573 | mmc_card_removed(host->card)) | |
08a7e1df AH |
574 | break; |
575 | ||
90a81489 AH |
576 | mmc_retune_recheck(host); |
577 | ||
08a7e1df AH |
578 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", |
579 | mmc_hostname(host), cmd->opcode, cmd->error); | |
580 | cmd->retries--; | |
581 | cmd->error = 0; | |
90a81489 | 582 | __mmc_start_request(host, mrq); |
08a7e1df | 583 | } |
90a81489 AH |
584 | |
585 | mmc_retune_release(host); | |
aa8b683a | 586 | } |
30137903 AH |
587 | EXPORT_SYMBOL(mmc_wait_for_req_done); |
588 | ||
589 | /** | |
590 | * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done | |
591 | * @host: MMC host | |
592 | * @mrq: MMC request | |
593 | * | |
594 | * mmc_is_req_done() is used with requests that have | |
595 | * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after | |
596 | * starting a request and before waiting for it to complete. That is, | |
597 | * either in between calls to mmc_start_req(), or after mmc_wait_for_req() | |
598 | * and before mmc_wait_for_req_done(). If it is called at other times the | |
599 | * result is not meaningful. | |
600 | */ | |
601 | bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq) | |
602 | { | |
603 | if (host->areq) | |
604 | return host->context_info.is_done_rcv; | |
605 | else | |
606 | return completion_done(&mrq->completion); | |
607 | } | |
608 | EXPORT_SYMBOL(mmc_is_req_done); | |
aa8b683a PF |
609 | |
610 | /** | |
611 | * mmc_pre_req - Prepare for a new request | |
612 | * @host: MMC host to prepare command | |
613 | * @mrq: MMC request to prepare for | |
614 | * @is_first_req: true if there is no previous started request | |
615 | * that may run in parellel to this call, otherwise false | |
616 | * | |
617 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
618 | * host prepare for the new request. Preparation of a request may be | |
619 | * performed while another request is running on the host. | |
620 | */ | |
621 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
622 | bool is_first_req) | |
623 | { | |
9eadcc05 | 624 | if (host->ops->pre_req) |
aa8b683a PF |
625 | host->ops->pre_req(host, mrq, is_first_req); |
626 | } | |
627 | ||
628 | /** | |
629 | * mmc_post_req - Post process a completed request | |
630 | * @host: MMC host to post process command | |
631 | * @mrq: MMC request to post process for | |
632 | * @err: Error, if non zero, clean up any resources made in pre_req | |
633 | * | |
634 | * Let the host post process a completed request. Post processing of | |
635 | * a request may be performed while another reuqest is running. | |
636 | */ | |
637 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
638 | int err) | |
639 | { | |
9eadcc05 | 640 | if (host->ops->post_req) |
aa8b683a | 641 | host->ops->post_req(host, mrq, err); |
1da177e4 LT |
642 | } |
643 | ||
aa8b683a PF |
644 | /** |
645 | * mmc_start_req - start a non-blocking request | |
646 | * @host: MMC host to start command | |
647 | * @areq: async request to start | |
648 | * @error: out parameter returns 0 for success, otherwise non zero | |
649 | * | |
650 | * Start a new MMC custom command request for a host. | |
651 | * If there is on ongoing async request wait for completion | |
652 | * of that request and start the new one and return. | |
653 | * Does not wait for the new request to complete. | |
654 | * | |
655 | * Returns the completed request, NULL in case of none completed. | |
656 | * Wait for the an ongoing request (previoulsy started) to complete and | |
657 | * return the completed request. If there is no ongoing request, NULL | |
658 | * is returned without waiting. NULL is not an error condition. | |
659 | */ | |
660 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
661 | struct mmc_async_req *areq, int *error) | |
662 | { | |
663 | int err = 0; | |
956d9fd5 | 664 | int start_err = 0; |
aa8b683a PF |
665 | struct mmc_async_req *data = host->areq; |
666 | ||
667 | /* Prepare a new request */ | |
668 | if (areq) | |
669 | mmc_pre_req(host, areq->mrq, !host->areq); | |
670 | ||
671 | if (host->areq) { | |
f5c2758f JC |
672 | err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq); |
673 | if (err == MMC_BLK_NEW_REQUEST) { | |
674 | if (error) | |
675 | *error = err; | |
676 | /* | |
677 | * The previous request was not completed, | |
678 | * nothing to return | |
679 | */ | |
680 | return NULL; | |
681 | } | |
950d56ac JC |
682 | /* |
683 | * Check BKOPS urgency for each R1 response | |
684 | */ | |
685 | if (host->card && mmc_card_mmc(host->card) && | |
686 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
687 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
64b12a68 SK |
688 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) { |
689 | ||
690 | /* Cancel the prepared request */ | |
691 | if (areq) | |
692 | mmc_post_req(host, areq->mrq, -EINVAL); | |
693 | ||
950d56ac | 694 | mmc_start_bkops(host->card, true); |
64b12a68 SK |
695 | |
696 | /* prepare the request again */ | |
697 | if (areq) | |
698 | mmc_pre_req(host, areq->mrq, !host->areq); | |
699 | } | |
aa8b683a PF |
700 | } |
701 | ||
956d9fd5 | 702 | if (!err && areq) |
2220eedf | 703 | start_err = __mmc_start_data_req(host, areq->mrq); |
aa8b683a PF |
704 | |
705 | if (host->areq) | |
706 | mmc_post_req(host, host->areq->mrq, 0); | |
707 | ||
956d9fd5 UH |
708 | /* Cancel a prepared request if it was not started. */ |
709 | if ((err || start_err) && areq) | |
f5c2758f | 710 | mmc_post_req(host, areq->mrq, -EINVAL); |
956d9fd5 UH |
711 | |
712 | if (err) | |
713 | host->areq = NULL; | |
714 | else | |
715 | host->areq = areq; | |
716 | ||
aa8b683a PF |
717 | if (error) |
718 | *error = err; | |
719 | return data; | |
720 | } | |
721 | EXPORT_SYMBOL(mmc_start_req); | |
722 | ||
67a61c48 PO |
723 | /** |
724 | * mmc_wait_for_req - start a request and wait for completion | |
725 | * @host: MMC host to start command | |
726 | * @mrq: MMC request to start | |
727 | * | |
728 | * Start a new MMC custom command request for a host, and wait | |
30137903 AH |
729 | * for the command to complete. In the case of 'cap_cmd_during_tfr' |
730 | * requests, the transfer is ongoing and the caller can issue further | |
731 | * commands that do not use the data lines, and then wait by calling | |
732 | * mmc_wait_for_req_done(). | |
733 | * Does not attempt to parse the response. | |
67a61c48 PO |
734 | */ |
735 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 736 | { |
aa8b683a | 737 | __mmc_start_req(host, mrq); |
30137903 AH |
738 | |
739 | if (!mrq->cap_cmd_during_tfr) | |
740 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 741 | } |
1da177e4 LT |
742 | EXPORT_SYMBOL(mmc_wait_for_req); |
743 | ||
eb0d8f13 JC |
744 | /** |
745 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
746 | * @card: the MMC card associated with the HPI transfer | |
747 | * | |
748 | * Issued High Priority Interrupt, and check for card status | |
950d56ac | 749 | * until out-of prg-state. |
eb0d8f13 JC |
750 | */ |
751 | int mmc_interrupt_hpi(struct mmc_card *card) | |
752 | { | |
753 | int err; | |
754 | u32 status; | |
6af9e96e | 755 | unsigned long prg_wait; |
eb0d8f13 JC |
756 | |
757 | BUG_ON(!card); | |
758 | ||
759 | if (!card->ext_csd.hpi_en) { | |
760 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
761 | return 1; | |
762 | } | |
763 | ||
764 | mmc_claim_host(card->host); | |
765 | err = mmc_send_status(card, &status); | |
766 | if (err) { | |
767 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
768 | goto out; | |
769 | } | |
770 | ||
6af9e96e V |
771 | switch (R1_CURRENT_STATE(status)) { |
772 | case R1_STATE_IDLE: | |
773 | case R1_STATE_READY: | |
774 | case R1_STATE_STBY: | |
211d4fe5 | 775 | case R1_STATE_TRAN: |
6af9e96e | 776 | /* |
211d4fe5 | 777 | * In idle and transfer states, HPI is not needed and the caller |
6af9e96e V |
778 | * can issue the next intended command immediately |
779 | */ | |
780 | goto out; | |
781 | case R1_STATE_PRG: | |
782 | break; | |
783 | default: | |
784 | /* In all other states, it's illegal to issue HPI */ | |
785 | pr_debug("%s: HPI cannot be sent. Card state=%d\n", | |
786 | mmc_hostname(card->host), R1_CURRENT_STATE(status)); | |
787 | err = -EINVAL; | |
788 | goto out; | |
789 | } | |
790 | ||
791 | err = mmc_send_hpi_cmd(card, &status); | |
792 | if (err) | |
793 | goto out; | |
794 | ||
795 | prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time); | |
796 | do { | |
797 | err = mmc_send_status(card, &status); | |
798 | ||
799 | if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN) | |
800 | break; | |
801 | if (time_after(jiffies, prg_wait)) | |
802 | err = -ETIMEDOUT; | |
803 | } while (!err); | |
eb0d8f13 JC |
804 | |
805 | out: | |
806 | mmc_release_host(card->host); | |
807 | return err; | |
808 | } | |
809 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
810 | ||
1da177e4 LT |
811 | /** |
812 | * mmc_wait_for_cmd - start a command and wait for completion | |
813 | * @host: MMC host to start command | |
814 | * @cmd: MMC command to start | |
815 | * @retries: maximum number of retries | |
816 | * | |
817 | * Start a new MMC command for a host, and wait for the command | |
818 | * to complete. Return any error that occurred while the command | |
819 | * was executing. Do not attempt to parse the response. | |
820 | */ | |
821 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
822 | { | |
ad5fd972 | 823 | struct mmc_request mrq = {NULL}; |
1da177e4 | 824 | |
d84075c8 | 825 | WARN_ON(!host->claimed); |
1da177e4 | 826 | |
1da177e4 LT |
827 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
828 | cmd->retries = retries; | |
829 | ||
830 | mrq.cmd = cmd; | |
831 | cmd->data = NULL; | |
832 | ||
833 | mmc_wait_for_req(host, &mrq); | |
834 | ||
835 | return cmd->error; | |
836 | } | |
837 | ||
838 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
839 | ||
950d56ac JC |
840 | /** |
841 | * mmc_stop_bkops - stop ongoing BKOPS | |
842 | * @card: MMC card to check BKOPS | |
843 | * | |
844 | * Send HPI command to stop ongoing background operations to | |
845 | * allow rapid servicing of foreground operations, e.g. read/ | |
846 | * writes. Wait until the card comes out of the programming state | |
847 | * to avoid errors in servicing read/write requests. | |
848 | */ | |
849 | int mmc_stop_bkops(struct mmc_card *card) | |
850 | { | |
851 | int err = 0; | |
852 | ||
853 | BUG_ON(!card); | |
854 | err = mmc_interrupt_hpi(card); | |
855 | ||
856 | /* | |
857 | * If err is EINVAL, we can't issue an HPI. | |
858 | * It should complete the BKOPS. | |
859 | */ | |
860 | if (!err || (err == -EINVAL)) { | |
861 | mmc_card_clr_doing_bkops(card); | |
66073d86 | 862 | mmc_retune_release(card->host); |
950d56ac JC |
863 | err = 0; |
864 | } | |
865 | ||
866 | return err; | |
867 | } | |
868 | EXPORT_SYMBOL(mmc_stop_bkops); | |
869 | ||
870 | int mmc_read_bkops_status(struct mmc_card *card) | |
871 | { | |
872 | int err; | |
873 | u8 *ext_csd; | |
874 | ||
950d56ac | 875 | mmc_claim_host(card->host); |
b2cada73 | 876 | err = mmc_get_ext_csd(card, &ext_csd); |
950d56ac JC |
877 | mmc_release_host(card->host); |
878 | if (err) | |
b2cada73 | 879 | return err; |
950d56ac JC |
880 | |
881 | card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; | |
882 | card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS]; | |
950d56ac | 883 | kfree(ext_csd); |
b2cada73 | 884 | return 0; |
950d56ac JC |
885 | } |
886 | EXPORT_SYMBOL(mmc_read_bkops_status); | |
887 | ||
d773d725 RK |
888 | /** |
889 | * mmc_set_data_timeout - set the timeout for a data command | |
890 | * @data: data phase for command | |
891 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
892 | * |
893 | * Computes the data timeout parameters according to the | |
894 | * correct algorithm given the card type. | |
d773d725 | 895 | */ |
b146d26a | 896 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
897 | { |
898 | unsigned int mult; | |
899 | ||
e6f918bf PO |
900 | /* |
901 | * SDIO cards only define an upper 1 s limit on access. | |
902 | */ | |
903 | if (mmc_card_sdio(card)) { | |
904 | data->timeout_ns = 1000000000; | |
905 | data->timeout_clks = 0; | |
906 | return; | |
907 | } | |
908 | ||
d773d725 RK |
909 | /* |
910 | * SD cards use a 100 multiplier rather than 10 | |
911 | */ | |
912 | mult = mmc_card_sd(card) ? 100 : 10; | |
913 | ||
914 | /* | |
915 | * Scale up the multiplier (and therefore the timeout) by | |
916 | * the r2w factor for writes. | |
917 | */ | |
b146d26a | 918 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
919 | mult <<= card->csd.r2w_factor; |
920 | ||
921 | data->timeout_ns = card->csd.tacc_ns * mult; | |
922 | data->timeout_clks = card->csd.tacc_clks * mult; | |
923 | ||
924 | /* | |
925 | * SD cards also have an upper limit on the timeout. | |
926 | */ | |
927 | if (mmc_card_sd(card)) { | |
928 | unsigned int timeout_us, limit_us; | |
929 | ||
930 | timeout_us = data->timeout_ns / 1000; | |
9eadcc05 | 931 | if (card->host->ios.clock) |
e9b86841 | 932 | timeout_us += data->timeout_clks * 1000 / |
9eadcc05 | 933 | (card->host->ios.clock / 1000); |
d773d725 | 934 | |
b146d26a | 935 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 936 | /* |
3bdc9ba8 PW |
937 | * The MMC spec "It is strongly recommended |
938 | * for hosts to implement more than 500ms | |
939 | * timeout value even if the card indicates | |
940 | * the 250ms maximum busy length." Even the | |
941 | * previous value of 300ms is known to be | |
942 | * insufficient for some cards. | |
493890e7 | 943 | */ |
3bdc9ba8 | 944 | limit_us = 3000000; |
d773d725 RK |
945 | else |
946 | limit_us = 100000; | |
947 | ||
fba68bd2 PL |
948 | /* |
949 | * SDHC cards always use these fixed values. | |
950 | */ | |
951 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
952 | data->timeout_ns = limit_us * 1000; |
953 | data->timeout_clks = 0; | |
954 | } | |
f7bf11a3 SW |
955 | |
956 | /* assign limit value if invalid */ | |
957 | if (timeout_us == 0) | |
958 | data->timeout_ns = limit_us * 1000; | |
d773d725 | 959 | } |
6de5fc9c SNX |
960 | |
961 | /* | |
962 | * Some cards require longer data read timeout than indicated in CSD. | |
963 | * Address this by setting the read timeout to a "reasonably high" | |
32ecd320 | 964 | * value. For the cards tested, 600ms has proven enough. If necessary, |
6de5fc9c SNX |
965 | * this value can be increased if other problematic cards require this. |
966 | */ | |
967 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
32ecd320 | 968 | data->timeout_ns = 600000000; |
6de5fc9c SNX |
969 | data->timeout_clks = 0; |
970 | } | |
971 | ||
c0c88871 WM |
972 | /* |
973 | * Some cards need very high timeouts if driven in SPI mode. | |
974 | * The worst observed timeout was 900ms after writing a | |
975 | * continuous stream of data until the internal logic | |
976 | * overflowed. | |
977 | */ | |
978 | if (mmc_host_is_spi(card->host)) { | |
979 | if (data->flags & MMC_DATA_WRITE) { | |
980 | if (data->timeout_ns < 1000000000) | |
981 | data->timeout_ns = 1000000000; /* 1s */ | |
982 | } else { | |
983 | if (data->timeout_ns < 100000000) | |
984 | data->timeout_ns = 100000000; /* 100ms */ | |
985 | } | |
986 | } | |
d773d725 RK |
987 | } |
988 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
989 | ||
ad3868b2 PO |
990 | /** |
991 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
992 | * @card: the MMC card associated with the data transfer | |
993 | * @sz: original transfer size | |
994 | * | |
995 | * Pads the original data size with a number of extra bytes in | |
996 | * order to avoid controller bugs and/or performance hits | |
997 | * (e.g. some controllers revert to PIO for certain sizes). | |
998 | * | |
999 | * Returns the improved size, which might be unmodified. | |
1000 | * | |
1001 | * Note that this function is only relevant when issuing a | |
1002 | * single scatter gather entry. | |
1003 | */ | |
1004 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
1005 | { | |
1006 | /* | |
1007 | * FIXME: We don't have a system for the controller to tell | |
1008 | * the core about its problems yet, so for now we just 32-bit | |
1009 | * align the size. | |
1010 | */ | |
1011 | sz = ((sz + 3) / 4) * 4; | |
1012 | ||
1013 | return sz; | |
1014 | } | |
1015 | EXPORT_SYMBOL(mmc_align_data_size); | |
1016 | ||
1da177e4 | 1017 | /** |
2342f332 | 1018 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 1019 | * @host: mmc host to claim |
2342f332 | 1020 | * @abort: whether or not the operation should be aborted |
1da177e4 | 1021 | * |
2342f332 NP |
1022 | * Claim a host for a set of operations. If @abort is non null and |
1023 | * dereference a non-zero value then this will return prematurely with | |
1024 | * that non-zero value without acquiring the lock. Returns zero | |
1025 | * with the lock held otherwise. | |
1da177e4 | 1026 | */ |
2342f332 | 1027 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
1028 | { |
1029 | DECLARE_WAITQUEUE(wait, current); | |
1030 | unsigned long flags; | |
2342f332 | 1031 | int stop; |
9250aea7 | 1032 | bool pm = false; |
1da177e4 | 1033 | |
cf795bfb PO |
1034 | might_sleep(); |
1035 | ||
1da177e4 LT |
1036 | add_wait_queue(&host->wq, &wait); |
1037 | spin_lock_irqsave(&host->lock, flags); | |
1038 | while (1) { | |
1039 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 1040 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 1041 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
1042 | break; |
1043 | spin_unlock_irqrestore(&host->lock, flags); | |
1044 | schedule(); | |
1045 | spin_lock_irqsave(&host->lock, flags); | |
1046 | } | |
1047 | set_current_state(TASK_RUNNING); | |
319a3f14 | 1048 | if (!stop) { |
2342f332 | 1049 | host->claimed = 1; |
319a3f14 AH |
1050 | host->claimer = current; |
1051 | host->claim_cnt += 1; | |
9250aea7 UH |
1052 | if (host->claim_cnt == 1) |
1053 | pm = true; | |
319a3f14 | 1054 | } else |
2342f332 | 1055 | wake_up(&host->wq); |
1da177e4 LT |
1056 | spin_unlock_irqrestore(&host->lock, flags); |
1057 | remove_wait_queue(&host->wq, &wait); | |
9250aea7 UH |
1058 | |
1059 | if (pm) | |
1060 | pm_runtime_get_sync(mmc_dev(host)); | |
1061 | ||
2342f332 | 1062 | return stop; |
1da177e4 | 1063 | } |
2342f332 | 1064 | EXPORT_SYMBOL(__mmc_claim_host); |
8ea926b2 | 1065 | |
ab1efd27 | 1066 | /** |
907d2e7c | 1067 | * mmc_release_host - release a host |
ab1efd27 UH |
1068 | * @host: mmc host to release |
1069 | * | |
907d2e7c AH |
1070 | * Release a MMC host, allowing others to claim the host |
1071 | * for their operations. | |
ab1efd27 | 1072 | */ |
907d2e7c | 1073 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
1074 | { |
1075 | unsigned long flags; | |
1076 | ||
907d2e7c AH |
1077 | WARN_ON(!host->claimed); |
1078 | ||
8ea926b2 | 1079 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
1080 | if (--host->claim_cnt) { |
1081 | /* Release for nested claim */ | |
1082 | spin_unlock_irqrestore(&host->lock, flags); | |
1083 | } else { | |
1084 | host->claimed = 0; | |
1085 | host->claimer = NULL; | |
1086 | spin_unlock_irqrestore(&host->lock, flags); | |
1087 | wake_up(&host->wq); | |
9250aea7 UH |
1088 | pm_runtime_mark_last_busy(mmc_dev(host)); |
1089 | pm_runtime_put_autosuspend(mmc_dev(host)); | |
319a3f14 | 1090 | } |
8ea926b2 | 1091 | } |
1da177e4 LT |
1092 | EXPORT_SYMBOL(mmc_release_host); |
1093 | ||
e94cfef6 UH |
1094 | /* |
1095 | * This is a helper function, which fetches a runtime pm reference for the | |
1096 | * card device and also claims the host. | |
1097 | */ | |
1098 | void mmc_get_card(struct mmc_card *card) | |
1099 | { | |
1100 | pm_runtime_get_sync(&card->dev); | |
1101 | mmc_claim_host(card->host); | |
1102 | } | |
1103 | EXPORT_SYMBOL(mmc_get_card); | |
1104 | ||
1105 | /* | |
1106 | * This is a helper function, which releases the host and drops the runtime | |
1107 | * pm reference for the card device. | |
1108 | */ | |
1109 | void mmc_put_card(struct mmc_card *card) | |
1110 | { | |
1111 | mmc_release_host(card->host); | |
1112 | pm_runtime_mark_last_busy(&card->dev); | |
1113 | pm_runtime_put_autosuspend(&card->dev); | |
1114 | } | |
1115 | EXPORT_SYMBOL(mmc_put_card); | |
1116 | ||
7ea239d9 PO |
1117 | /* |
1118 | * Internal function that does the actual ios call to the host driver, | |
1119 | * optionally printing some debug output. | |
1120 | */ | |
920e70c5 RK |
1121 | static inline void mmc_set_ios(struct mmc_host *host) |
1122 | { | |
1123 | struct mmc_ios *ios = &host->ios; | |
1124 | ||
cd9277c0 PO |
1125 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
1126 | "width %u timing %u\n", | |
920e70c5 RK |
1127 | mmc_hostname(host), ios->clock, ios->bus_mode, |
1128 | ios->power_mode, ios->chip_select, ios->vdd, | |
ed9feec7 | 1129 | 1 << ios->bus_width, ios->timing); |
fba68bd2 | 1130 | |
920e70c5 RK |
1131 | host->ops->set_ios(host, ios); |
1132 | } | |
1133 | ||
7ea239d9 PO |
1134 | /* |
1135 | * Control chip select pin on a host. | |
1136 | */ | |
da7fbe58 | 1137 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 1138 | { |
da7fbe58 PO |
1139 | host->ios.chip_select = mode; |
1140 | mmc_set_ios(host); | |
1da177e4 LT |
1141 | } |
1142 | ||
7ea239d9 PO |
1143 | /* |
1144 | * Sets the host clock to the highest possible frequency that | |
1145 | * is below "hz". | |
1146 | */ | |
9eadcc05 | 1147 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 | 1148 | { |
6a98f1e8 | 1149 | WARN_ON(hz && hz < host->f_min); |
7ea239d9 PO |
1150 | |
1151 | if (hz > host->f_max) | |
1152 | hz = host->f_max; | |
1153 | ||
1154 | host->ios.clock = hz; | |
1155 | mmc_set_ios(host); | |
1156 | } | |
1157 | ||
63e415c6 AH |
1158 | int mmc_execute_tuning(struct mmc_card *card) |
1159 | { | |
1160 | struct mmc_host *host = card->host; | |
1161 | u32 opcode; | |
1162 | int err; | |
1163 | ||
1164 | if (!host->ops->execute_tuning) | |
1165 | return 0; | |
1166 | ||
1167 | if (mmc_card_mmc(card)) | |
1168 | opcode = MMC_SEND_TUNING_BLOCK_HS200; | |
1169 | else | |
1170 | opcode = MMC_SEND_TUNING_BLOCK; | |
1171 | ||
63e415c6 | 1172 | err = host->ops->execute_tuning(host, opcode); |
63e415c6 AH |
1173 | |
1174 | if (err) | |
07d97d87 RK |
1175 | pr_err("%s: tuning execution failed: %d\n", |
1176 | mmc_hostname(host), err); | |
79d5a65a AH |
1177 | else |
1178 | mmc_retune_enable(host); | |
63e415c6 AH |
1179 | |
1180 | return err; | |
1181 | } | |
1182 | ||
7ea239d9 PO |
1183 | /* |
1184 | * Change the bus mode (open drain/push-pull) of a host. | |
1185 | */ | |
1186 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
1187 | { | |
1188 | host->ios.bus_mode = mode; | |
1189 | mmc_set_ios(host); | |
1190 | } | |
1191 | ||
0f8d8ea6 AH |
1192 | /* |
1193 | * Change data bus width of a host. | |
1194 | */ | |
1195 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
1196 | { | |
4c4cb171 PR |
1197 | host->ios.bus_width = width; |
1198 | mmc_set_ios(host); | |
0f8d8ea6 AH |
1199 | } |
1200 | ||
2d079c43 JR |
1201 | /* |
1202 | * Set initial state after a power cycle or a hw_reset. | |
1203 | */ | |
1204 | void mmc_set_initial_state(struct mmc_host *host) | |
1205 | { | |
79d5a65a AH |
1206 | mmc_retune_disable(host); |
1207 | ||
2d079c43 JR |
1208 | if (mmc_host_is_spi(host)) |
1209 | host->ios.chip_select = MMC_CS_HIGH; | |
1210 | else | |
1211 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1212 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1213 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
1214 | host->ios.timing = MMC_TIMING_LEGACY; | |
75e8a228 | 1215 | host->ios.drv_type = 0; |
81ac2af6 SL |
1216 | host->ios.enhanced_strobe = false; |
1217 | ||
1218 | /* | |
1219 | * Make sure we are in non-enhanced strobe mode before we | |
1220 | * actually enable it in ext_csd. | |
1221 | */ | |
1222 | if ((host->caps2 & MMC_CAP2_HS400_ES) && | |
1223 | host->ops->hs400_enhanced_strobe) | |
1224 | host->ops->hs400_enhanced_strobe(host, &host->ios); | |
2d079c43 JR |
1225 | |
1226 | mmc_set_ios(host); | |
1227 | } | |
1228 | ||
86e8286a AV |
1229 | /** |
1230 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
1231 | * @vdd: voltage (mV) | |
1232 | * @low_bits: prefer low bits in boundary cases | |
1233 | * | |
1234 | * This function returns the OCR bit number according to the provided @vdd | |
1235 | * value. If conversion is not possible a negative errno value returned. | |
1236 | * | |
1237 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
1238 | * on boundary voltages. For example, | |
1239 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
1240 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
1241 | * | |
1242 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
1243 | */ | |
1244 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
1245 | { | |
1246 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1247 | int bit; | |
1248 | ||
1249 | if (vdd < 1650 || vdd > 3600) | |
1250 | return -EINVAL; | |
1251 | ||
1252 | if (vdd >= 1650 && vdd <= 1950) | |
1253 | return ilog2(MMC_VDD_165_195); | |
1254 | ||
1255 | if (low_bits) | |
1256 | vdd -= 1; | |
1257 | ||
1258 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1259 | bit = (vdd - 2000) / 100 + 8; | |
1260 | if (bit > max_bit) | |
1261 | return max_bit; | |
1262 | return bit; | |
1263 | } | |
1264 | ||
1265 | /** | |
1266 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1267 | * @vdd_min: minimum voltage value (mV) | |
1268 | * @vdd_max: maximum voltage value (mV) | |
1269 | * | |
1270 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1271 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1272 | * | |
1273 | * Notes wrt boundary cases: | |
1274 | * This function sets the OCR bits for all boundary voltages, for example | |
1275 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1276 | * MMC_VDD_34_35 mask. | |
1277 | */ | |
1278 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1279 | { | |
1280 | u32 mask = 0; | |
1281 | ||
1282 | if (vdd_max < vdd_min) | |
1283 | return 0; | |
1284 | ||
1285 | /* Prefer high bits for the boundary vdd_max values. */ | |
1286 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1287 | if (vdd_max < 0) | |
1288 | return 0; | |
1289 | ||
1290 | /* Prefer low bits for the boundary vdd_min values. */ | |
1291 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1292 | if (vdd_min < 0) | |
1293 | return 0; | |
1294 | ||
1295 | /* Fill the mask, from max bit to min bit. */ | |
1296 | while (vdd_max >= vdd_min) | |
1297 | mask |= 1 << vdd_max--; | |
1298 | ||
1299 | return mask; | |
1300 | } | |
1301 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1302 | ||
6e9e318b HZ |
1303 | #ifdef CONFIG_OF |
1304 | ||
1305 | /** | |
1306 | * mmc_of_parse_voltage - return mask of supported voltages | |
1307 | * @np: The device node need to be parsed. | |
1308 | * @mask: mask of voltages available for MMC/SD/SDIO | |
1309 | * | |
cf925747 RK |
1310 | * Parse the "voltage-ranges" DT property, returning zero if it is not |
1311 | * found, negative errno if the voltage-range specification is invalid, | |
1312 | * or one if the voltage-range is specified and successfully parsed. | |
6e9e318b HZ |
1313 | */ |
1314 | int mmc_of_parse_voltage(struct device_node *np, u32 *mask) | |
1315 | { | |
1316 | const u32 *voltage_ranges; | |
1317 | int num_ranges, i; | |
1318 | ||
1319 | voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); | |
1320 | num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; | |
10a16a01 RK |
1321 | if (!voltage_ranges) { |
1322 | pr_debug("%s: voltage-ranges unspecified\n", np->full_name); | |
cf925747 | 1323 | return 0; |
10a16a01 RK |
1324 | } |
1325 | if (!num_ranges) { | |
1326 | pr_err("%s: voltage-ranges empty\n", np->full_name); | |
6e9e318b HZ |
1327 | return -EINVAL; |
1328 | } | |
1329 | ||
1330 | for (i = 0; i < num_ranges; i++) { | |
1331 | const int j = i * 2; | |
1332 | u32 ocr_mask; | |
1333 | ||
1334 | ocr_mask = mmc_vddrange_to_ocrmask( | |
1335 | be32_to_cpu(voltage_ranges[j]), | |
1336 | be32_to_cpu(voltage_ranges[j + 1])); | |
1337 | if (!ocr_mask) { | |
1338 | pr_err("%s: voltage-range #%d is invalid\n", | |
1339 | np->full_name, i); | |
1340 | return -EINVAL; | |
1341 | } | |
1342 | *mask |= ocr_mask; | |
1343 | } | |
1344 | ||
cf925747 | 1345 | return 1; |
6e9e318b HZ |
1346 | } |
1347 | EXPORT_SYMBOL(mmc_of_parse_voltage); | |
1348 | ||
1349 | #endif /* CONFIG_OF */ | |
1350 | ||
25185f3f SH |
1351 | static int mmc_of_get_func_num(struct device_node *node) |
1352 | { | |
1353 | u32 reg; | |
1354 | int ret; | |
1355 | ||
1356 | ret = of_property_read_u32(node, "reg", ®); | |
1357 | if (ret < 0) | |
1358 | return ret; | |
1359 | ||
1360 | return reg; | |
1361 | } | |
1362 | ||
1363 | struct device_node *mmc_of_find_child_device(struct mmc_host *host, | |
1364 | unsigned func_num) | |
1365 | { | |
1366 | struct device_node *node; | |
1367 | ||
1368 | if (!host->parent || !host->parent->of_node) | |
1369 | return NULL; | |
1370 | ||
1371 | for_each_child_of_node(host->parent->of_node, node) { | |
1372 | if (mmc_of_get_func_num(node) == func_num) | |
1373 | return node; | |
1374 | } | |
1375 | ||
1376 | return NULL; | |
1377 | } | |
1378 | ||
5c13941a DB |
1379 | #ifdef CONFIG_REGULATOR |
1380 | ||
310c805e HS |
1381 | /** |
1382 | * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage | |
1383 | * @vdd_bit: OCR bit number | |
1384 | * @min_uV: minimum voltage value (mV) | |
1385 | * @max_uV: maximum voltage value (mV) | |
1386 | * | |
1387 | * This function returns the voltage range according to the provided OCR | |
1388 | * bit number. If conversion is not possible a negative errno value returned. | |
1389 | */ | |
1390 | static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV) | |
1391 | { | |
1392 | int tmp; | |
1393 | ||
1394 | if (!vdd_bit) | |
1395 | return -EINVAL; | |
1396 | ||
1397 | /* | |
1398 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
1399 | * bits this regulator doesn't quite support ... don't | |
1400 | * be too picky, most cards and regulators are OK with | |
1401 | * a 0.1V range goof (it's a small error percentage). | |
1402 | */ | |
1403 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1404 | if (tmp == 0) { | |
1405 | *min_uV = 1650 * 1000; | |
1406 | *max_uV = 1950 * 1000; | |
1407 | } else { | |
1408 | *min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1409 | *max_uV = *min_uV + 100 * 1000; | |
1410 | } | |
1411 | ||
1412 | return 0; | |
1413 | } | |
1414 | ||
5c13941a DB |
1415 | /** |
1416 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1417 | * @supply: regulator to use | |
1418 | * | |
1419 | * This returns either a negative errno, or a mask of voltages that | |
1420 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1421 | * regulator. This would normally be called before registering the | |
1422 | * MMC host adapter. | |
1423 | */ | |
1424 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1425 | { | |
1426 | int result = 0; | |
1427 | int count; | |
1428 | int i; | |
9ed7ca89 JMC |
1429 | int vdd_uV; |
1430 | int vdd_mV; | |
5c13941a DB |
1431 | |
1432 | count = regulator_count_voltages(supply); | |
1433 | if (count < 0) | |
1434 | return count; | |
1435 | ||
1436 | for (i = 0; i < count; i++) { | |
5c13941a DB |
1437 | vdd_uV = regulator_list_voltage(supply, i); |
1438 | if (vdd_uV <= 0) | |
1439 | continue; | |
1440 | ||
1441 | vdd_mV = vdd_uV / 1000; | |
1442 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1443 | } | |
1444 | ||
9ed7ca89 JMC |
1445 | if (!result) { |
1446 | vdd_uV = regulator_get_voltage(supply); | |
1447 | if (vdd_uV <= 0) | |
1448 | return vdd_uV; | |
1449 | ||
1450 | vdd_mV = vdd_uV / 1000; | |
1451 | result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1452 | } | |
1453 | ||
5c13941a DB |
1454 | return result; |
1455 | } | |
45a6b32e | 1456 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1457 | |
1458 | /** | |
1459 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1460 | * @mmc: the host to regulate |
5c13941a | 1461 | * @supply: regulator to use |
99fc5131 | 1462 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1463 | * |
1464 | * Returns zero on success, else negative errno. | |
1465 | * | |
1466 | * MMC host drivers may use this to enable or disable a regulator using | |
1467 | * a particular supply voltage. This would normally be called from the | |
1468 | * set_ios() method. | |
1469 | */ | |
99fc5131 LW |
1470 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1471 | struct regulator *supply, | |
1472 | unsigned short vdd_bit) | |
5c13941a DB |
1473 | { |
1474 | int result = 0; | |
1475 | int min_uV, max_uV; | |
5c13941a DB |
1476 | |
1477 | if (vdd_bit) { | |
310c805e | 1478 | mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV); |
5c13941a | 1479 | |
ca6429d4 | 1480 | result = regulator_set_voltage(supply, min_uV, max_uV); |
99fc5131 | 1481 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1482 | result = regulator_enable(supply); |
99fc5131 LW |
1483 | if (!result) |
1484 | mmc->regulator_enabled = true; | |
1485 | } | |
1486 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1487 | result = regulator_disable(supply); |
99fc5131 LW |
1488 | if (result == 0) |
1489 | mmc->regulator_enabled = false; | |
5c13941a DB |
1490 | } |
1491 | ||
99fc5131 LW |
1492 | if (result) |
1493 | dev_err(mmc_dev(mmc), | |
1494 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1495 | return result; |
1496 | } | |
45a6b32e | 1497 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1498 | |
2086f801 DA |
1499 | static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator, |
1500 | int min_uV, int target_uV, | |
1501 | int max_uV) | |
1502 | { | |
1503 | /* | |
1504 | * Check if supported first to avoid errors since we may try several | |
1505 | * signal levels during power up and don't want to show errors. | |
1506 | */ | |
1507 | if (!regulator_is_supported_voltage(regulator, min_uV, max_uV)) | |
1508 | return -EINVAL; | |
1509 | ||
1510 | return regulator_set_voltage_triplet(regulator, min_uV, target_uV, | |
1511 | max_uV); | |
1512 | } | |
1513 | ||
1514 | /** | |
1515 | * mmc_regulator_set_vqmmc - Set VQMMC as per the ios | |
1516 | * | |
1517 | * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible. | |
1518 | * That will match the behavior of old boards where VQMMC and VMMC were supplied | |
1519 | * by the same supply. The Bus Operating conditions for 3.3V signaling in the | |
1520 | * SD card spec also define VQMMC in terms of VMMC. | |
1521 | * If this is not possible we'll try the full 2.7-3.6V of the spec. | |
1522 | * | |
1523 | * For 1.2V and 1.8V signaling we'll try to get as close as possible to the | |
1524 | * requested voltage. This is definitely a good idea for UHS where there's a | |
1525 | * separate regulator on the card that's trying to make 1.8V and it's best if | |
1526 | * we match. | |
1527 | * | |
1528 | * This function is expected to be used by a controller's | |
1529 | * start_signal_voltage_switch() function. | |
1530 | */ | |
1531 | int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios) | |
1532 | { | |
1533 | struct device *dev = mmc_dev(mmc); | |
1534 | int ret, volt, min_uV, max_uV; | |
1535 | ||
1536 | /* If no vqmmc supply then we can't change the voltage */ | |
1537 | if (IS_ERR(mmc->supply.vqmmc)) | |
1538 | return -EINVAL; | |
1539 | ||
1540 | switch (ios->signal_voltage) { | |
1541 | case MMC_SIGNAL_VOLTAGE_120: | |
1542 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1543 | 1100000, 1200000, 1300000); | |
1544 | case MMC_SIGNAL_VOLTAGE_180: | |
1545 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1546 | 1700000, 1800000, 1950000); | |
1547 | case MMC_SIGNAL_VOLTAGE_330: | |
1548 | ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV); | |
1549 | if (ret < 0) | |
1550 | return ret; | |
1551 | ||
1552 | dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n", | |
1553 | __func__, volt, max_uV); | |
1554 | ||
1555 | min_uV = max(volt - 300000, 2700000); | |
1556 | max_uV = min(max_uV + 200000, 3600000); | |
1557 | ||
1558 | /* | |
1559 | * Due to a limitation in the current implementation of | |
1560 | * regulator_set_voltage_triplet() which is taking the lowest | |
1561 | * voltage possible if below the target, search for a suitable | |
1562 | * voltage in two steps and try to stay close to vmmc | |
1563 | * with a 0.3V tolerance at first. | |
1564 | */ | |
1565 | if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1566 | min_uV, volt, max_uV)) | |
1567 | return 0; | |
1568 | ||
1569 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1570 | 2700000, volt, 3600000); | |
1571 | default: | |
1572 | return -EINVAL; | |
1573 | } | |
1574 | } | |
1575 | EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc); | |
1576 | ||
4d1f52f9 TK |
1577 | #endif /* CONFIG_REGULATOR */ |
1578 | ||
e137788d GL |
1579 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1580 | { | |
1581 | struct device *dev = mmc_dev(mmc); | |
e137788d GL |
1582 | int ret; |
1583 | ||
4d1f52f9 | 1584 | mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc"); |
bc35d5ed | 1585 | mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc"); |
e137788d | 1586 | |
4d1f52f9 TK |
1587 | if (IS_ERR(mmc->supply.vmmc)) { |
1588 | if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER) | |
1589 | return -EPROBE_DEFER; | |
6e1bbc51 | 1590 | dev_dbg(dev, "No vmmc regulator found\n"); |
4d1f52f9 TK |
1591 | } else { |
1592 | ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc); | |
1593 | if (ret > 0) | |
1594 | mmc->ocr_avail = ret; | |
1595 | else | |
1596 | dev_warn(dev, "Failed getting OCR mask: %d\n", ret); | |
1597 | } | |
e137788d | 1598 | |
4d1f52f9 TK |
1599 | if (IS_ERR(mmc->supply.vqmmc)) { |
1600 | if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER) | |
1601 | return -EPROBE_DEFER; | |
6e1bbc51 | 1602 | dev_dbg(dev, "No vqmmc regulator found\n"); |
4d1f52f9 | 1603 | } |
e137788d GL |
1604 | |
1605 | return 0; | |
1606 | } | |
1607 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1608 | ||
1da177e4 LT |
1609 | /* |
1610 | * Mask off any voltages we don't support and select | |
1611 | * the lowest voltage | |
1612 | */ | |
7ea239d9 | 1613 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1614 | { |
1615 | int bit; | |
1616 | ||
726d6f23 UH |
1617 | /* |
1618 | * Sanity check the voltages that the card claims to | |
1619 | * support. | |
1620 | */ | |
1621 | if (ocr & 0x7F) { | |
1622 | dev_warn(mmc_dev(host), | |
1623 | "card claims to support voltages below defined range\n"); | |
1624 | ocr &= ~0x7F; | |
1625 | } | |
1626 | ||
1da177e4 | 1627 | ocr &= host->ocr_avail; |
ce69d37b UH |
1628 | if (!ocr) { |
1629 | dev_warn(mmc_dev(host), "no support for card's volts\n"); | |
1630 | return 0; | |
1631 | } | |
1da177e4 | 1632 | |
ce69d37b UH |
1633 | if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) { |
1634 | bit = ffs(ocr) - 1; | |
63ef731a | 1635 | ocr &= 3 << bit; |
ce69d37b | 1636 | mmc_power_cycle(host, ocr); |
1da177e4 | 1637 | } else { |
ce69d37b UH |
1638 | bit = fls(ocr) - 1; |
1639 | ocr &= 3 << bit; | |
1640 | if (bit != host->ios.vdd) | |
1641 | dev_warn(mmc_dev(host), "exceeding card's volts\n"); | |
1da177e4 LT |
1642 | } |
1643 | ||
1644 | return ocr; | |
1645 | } | |
1646 | ||
567c8903 JR |
1647 | int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) |
1648 | { | |
1649 | int err = 0; | |
1650 | int old_signal_voltage = host->ios.signal_voltage; | |
1651 | ||
1652 | host->ios.signal_voltage = signal_voltage; | |
9eadcc05 | 1653 | if (host->ops->start_signal_voltage_switch) |
567c8903 | 1654 | err = host->ops->start_signal_voltage_switch(host, &host->ios); |
567c8903 JR |
1655 | |
1656 | if (err) | |
1657 | host->ios.signal_voltage = old_signal_voltage; | |
1658 | ||
1659 | return err; | |
1660 | ||
1661 | } | |
1662 | ||
0f791fda | 1663 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr) |
f2119df6 AN |
1664 | { |
1665 | struct mmc_command cmd = {0}; | |
1666 | int err = 0; | |
0797e5f1 | 1667 | u32 clock; |
f2119df6 AN |
1668 | |
1669 | BUG_ON(!host); | |
1670 | ||
1671 | /* | |
1672 | * Send CMD11 only if the request is to switch the card to | |
1673 | * 1.8V signalling. | |
1674 | */ | |
0797e5f1 JR |
1675 | if (signal_voltage == MMC_SIGNAL_VOLTAGE_330) |
1676 | return __mmc_set_signal_voltage(host, signal_voltage); | |
f2119df6 | 1677 | |
0797e5f1 JR |
1678 | /* |
1679 | * If we cannot switch voltages, return failure so the caller | |
1680 | * can continue without UHS mode | |
1681 | */ | |
1682 | if (!host->ops->start_signal_voltage_switch) | |
1683 | return -EPERM; | |
1684 | if (!host->ops->card_busy) | |
6606110d JP |
1685 | pr_warn("%s: cannot verify signal voltage switch\n", |
1686 | mmc_hostname(host)); | |
0797e5f1 JR |
1687 | |
1688 | cmd.opcode = SD_SWITCH_VOLTAGE; | |
1689 | cmd.arg = 0; | |
1690 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1691 | ||
1692 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1693 | if (err) | |
9eadcc05 UH |
1694 | return err; |
1695 | ||
1696 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1697 | return -EIO; | |
0797e5f1 | 1698 | |
0797e5f1 JR |
1699 | /* |
1700 | * The card should drive cmd and dat[0:3] low immediately | |
1701 | * after the response of cmd11, but wait 1 ms to be sure | |
1702 | */ | |
1703 | mmc_delay(1); | |
1704 | if (host->ops->card_busy && !host->ops->card_busy(host)) { | |
1705 | err = -EAGAIN; | |
1706 | goto power_cycle; | |
1707 | } | |
1708 | /* | |
1709 | * During a signal voltage level switch, the clock must be gated | |
1710 | * for 5 ms according to the SD spec | |
1711 | */ | |
1712 | clock = host->ios.clock; | |
1713 | host->ios.clock = 0; | |
1714 | mmc_set_ios(host); | |
f2119df6 | 1715 | |
0797e5f1 JR |
1716 | if (__mmc_set_signal_voltage(host, signal_voltage)) { |
1717 | /* | |
1718 | * Voltages may not have been switched, but we've already | |
1719 | * sent CMD11, so a power cycle is required anyway | |
1720 | */ | |
1721 | err = -EAGAIN; | |
1722 | goto power_cycle; | |
f2119df6 AN |
1723 | } |
1724 | ||
7c5209c3 DA |
1725 | /* Keep clock gated for at least 10 ms, though spec only says 5 ms */ |
1726 | mmc_delay(10); | |
0797e5f1 JR |
1727 | host->ios.clock = clock; |
1728 | mmc_set_ios(host); | |
1729 | ||
1730 | /* Wait for at least 1 ms according to spec */ | |
1731 | mmc_delay(1); | |
1732 | ||
1733 | /* | |
1734 | * Failure to switch is indicated by the card holding | |
1735 | * dat[0:3] low | |
1736 | */ | |
1737 | if (host->ops->card_busy && host->ops->card_busy(host)) | |
1738 | err = -EAGAIN; | |
1739 | ||
1740 | power_cycle: | |
1741 | if (err) { | |
1742 | pr_debug("%s: Signal voltage switch failed, " | |
1743 | "power cycling card\n", mmc_hostname(host)); | |
0f791fda | 1744 | mmc_power_cycle(host, ocr); |
0797e5f1 JR |
1745 | } |
1746 | ||
0797e5f1 | 1747 | return err; |
f2119df6 AN |
1748 | } |
1749 | ||
b57c43ad | 1750 | /* |
7ea239d9 | 1751 | * Select timing parameters for host. |
b57c43ad | 1752 | */ |
7ea239d9 | 1753 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1754 | { |
7ea239d9 PO |
1755 | host->ios.timing = timing; |
1756 | mmc_set_ios(host); | |
b57c43ad PO |
1757 | } |
1758 | ||
d6d50a15 AN |
1759 | /* |
1760 | * Select appropriate driver type for host. | |
1761 | */ | |
1762 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1763 | { | |
1764 | host->ios.drv_type = drv_type; | |
1765 | mmc_set_ios(host); | |
1766 | } | |
1767 | ||
e23350b3 AH |
1768 | int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr, |
1769 | int card_drv_type, int *drv_type) | |
1770 | { | |
1771 | struct mmc_host *host = card->host; | |
1772 | int host_drv_type = SD_DRIVER_TYPE_B; | |
e23350b3 AH |
1773 | |
1774 | *drv_type = 0; | |
1775 | ||
1776 | if (!host->ops->select_drive_strength) | |
1777 | return 0; | |
1778 | ||
1779 | /* Use SD definition of driver strength for hosts */ | |
1780 | if (host->caps & MMC_CAP_DRIVER_TYPE_A) | |
1781 | host_drv_type |= SD_DRIVER_TYPE_A; | |
1782 | ||
1783 | if (host->caps & MMC_CAP_DRIVER_TYPE_C) | |
1784 | host_drv_type |= SD_DRIVER_TYPE_C; | |
1785 | ||
1786 | if (host->caps & MMC_CAP_DRIVER_TYPE_D) | |
1787 | host_drv_type |= SD_DRIVER_TYPE_D; | |
1788 | ||
1789 | /* | |
1790 | * The drive strength that the hardware can support | |
1791 | * depends on the board design. Pass the appropriate | |
1792 | * information and let the hardware specific code | |
1793 | * return what is possible given the options | |
1794 | */ | |
9eadcc05 UH |
1795 | return host->ops->select_drive_strength(card, max_dtr, |
1796 | host_drv_type, | |
1797 | card_drv_type, | |
1798 | drv_type); | |
e23350b3 AH |
1799 | } |
1800 | ||
1da177e4 | 1801 | /* |
45f8245b RK |
1802 | * Apply power to the MMC stack. This is a two-stage process. |
1803 | * First, we enable power to the card without the clock running. | |
1804 | * We then wait a bit for the power to stabilise. Finally, | |
1805 | * enable the bus drivers and clock to the card. | |
1806 | * | |
1807 | * We must _NOT_ enable the clock prior to power stablising. | |
1808 | * | |
1809 | * If a host does all the power sequencing itself, ignore the | |
1810 | * initial MMC_POWER_UP stage. | |
1da177e4 | 1811 | */ |
4a065193 | 1812 | void mmc_power_up(struct mmc_host *host, u32 ocr) |
1da177e4 | 1813 | { |
fa550189 UH |
1814 | if (host->ios.power_mode == MMC_POWER_ON) |
1815 | return; | |
1816 | ||
3aa8793f UH |
1817 | mmc_pwrseq_pre_power_on(host); |
1818 | ||
4a065193 | 1819 | host->ios.vdd = fls(ocr) - 1; |
1da177e4 | 1820 | host->ios.power_mode = MMC_POWER_UP; |
2d079c43 JR |
1821 | /* Set initial state and call mmc_set_ios */ |
1822 | mmc_set_initial_state(host); | |
1da177e4 | 1823 | |
ceae98f2 TK |
1824 | /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */ |
1825 | if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0) | |
1826 | dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n"); | |
1827 | else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0) | |
1828 | dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n"); | |
1829 | else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0) | |
1830 | dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n"); | |
108ecc4c | 1831 | |
f9996aee PO |
1832 | /* |
1833 | * This delay should be sufficient to allow the power supply | |
1834 | * to reach the minimum voltage. | |
1835 | */ | |
79bccc5a | 1836 | mmc_delay(10); |
1da177e4 | 1837 | |
4febb7e2 UH |
1838 | mmc_pwrseq_post_power_on(host); |
1839 | ||
88ae8b86 | 1840 | host->ios.clock = host->f_init; |
8dfd0374 | 1841 | |
1da177e4 | 1842 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1843 | mmc_set_ios(host); |
1da177e4 | 1844 | |
f9996aee PO |
1845 | /* |
1846 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1847 | * time required to reach a stable voltage. | |
1848 | */ | |
79bccc5a | 1849 | mmc_delay(10); |
1da177e4 LT |
1850 | } |
1851 | ||
7f7e4129 | 1852 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1853 | { |
fa550189 UH |
1854 | if (host->ios.power_mode == MMC_POWER_OFF) |
1855 | return; | |
1856 | ||
3aa8793f UH |
1857 | mmc_pwrseq_power_off(host); |
1858 | ||
1da177e4 LT |
1859 | host->ios.clock = 0; |
1860 | host->ios.vdd = 0; | |
b33d46c3 | 1861 | |
1da177e4 | 1862 | host->ios.power_mode = MMC_POWER_OFF; |
2d079c43 JR |
1863 | /* Set initial state and call mmc_set_ios */ |
1864 | mmc_set_initial_state(host); | |
778e277c | 1865 | |
041beb1d DD |
1866 | /* |
1867 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1868 | * XO-1.5, require a short delay after poweroff before the card | |
1869 | * can be successfully turned on again. | |
1870 | */ | |
1871 | mmc_delay(1); | |
1da177e4 LT |
1872 | } |
1873 | ||
4a065193 | 1874 | void mmc_power_cycle(struct mmc_host *host, u32 ocr) |
276e090f JR |
1875 | { |
1876 | mmc_power_off(host); | |
1877 | /* Wait at least 1 ms according to SD spec */ | |
1878 | mmc_delay(1); | |
4a065193 | 1879 | mmc_power_up(host, ocr); |
276e090f JR |
1880 | } |
1881 | ||
39361851 AB |
1882 | /* |
1883 | * Cleanup when the last reference to the bus operator is dropped. | |
1884 | */ | |
261172fd | 1885 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1886 | { |
1887 | BUG_ON(!host); | |
1888 | BUG_ON(host->bus_refs); | |
1889 | BUG_ON(!host->bus_dead); | |
1890 | ||
1891 | host->bus_ops = NULL; | |
1892 | } | |
1893 | ||
1894 | /* | |
1895 | * Increase reference count of bus operator | |
1896 | */ | |
1897 | static inline void mmc_bus_get(struct mmc_host *host) | |
1898 | { | |
1899 | unsigned long flags; | |
1900 | ||
1901 | spin_lock_irqsave(&host->lock, flags); | |
1902 | host->bus_refs++; | |
1903 | spin_unlock_irqrestore(&host->lock, flags); | |
1904 | } | |
1905 | ||
1906 | /* | |
1907 | * Decrease reference count of bus operator and free it if | |
1908 | * it is the last reference. | |
1909 | */ | |
1910 | static inline void mmc_bus_put(struct mmc_host *host) | |
1911 | { | |
1912 | unsigned long flags; | |
1913 | ||
1914 | spin_lock_irqsave(&host->lock, flags); | |
1915 | host->bus_refs--; | |
1916 | if ((host->bus_refs == 0) && host->bus_ops) | |
1917 | __mmc_release_bus(host); | |
1918 | spin_unlock_irqrestore(&host->lock, flags); | |
1919 | } | |
1920 | ||
1da177e4 | 1921 | /* |
7ea239d9 PO |
1922 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1923 | * host at any given time. | |
1da177e4 | 1924 | */ |
7ea239d9 | 1925 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1926 | { |
7ea239d9 | 1927 | unsigned long flags; |
e45a1bd2 | 1928 | |
7ea239d9 PO |
1929 | BUG_ON(!host); |
1930 | BUG_ON(!ops); | |
b855885e | 1931 | |
d84075c8 | 1932 | WARN_ON(!host->claimed); |
bce40a36 | 1933 | |
7ea239d9 | 1934 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1935 | |
7ea239d9 PO |
1936 | BUG_ON(host->bus_ops); |
1937 | BUG_ON(host->bus_refs); | |
b57c43ad | 1938 | |
7ea239d9 PO |
1939 | host->bus_ops = ops; |
1940 | host->bus_refs = 1; | |
1941 | host->bus_dead = 0; | |
b57c43ad | 1942 | |
7ea239d9 | 1943 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1944 | } |
1945 | ||
7ea239d9 | 1946 | /* |
7f7e4129 | 1947 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1948 | */ |
1949 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1950 | { |
7ea239d9 | 1951 | unsigned long flags; |
7ccd266e | 1952 | |
7ea239d9 | 1953 | BUG_ON(!host); |
7ccd266e | 1954 | |
d84075c8 PO |
1955 | WARN_ON(!host->claimed); |
1956 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1957 | |
7ea239d9 | 1958 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1959 | |
7ea239d9 | 1960 | host->bus_dead = 1; |
7ccd266e | 1961 | |
7ea239d9 | 1962 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1963 | |
7ea239d9 | 1964 | mmc_bus_put(host); |
1da177e4 LT |
1965 | } |
1966 | ||
bbd43682 UH |
1967 | static void _mmc_detect_change(struct mmc_host *host, unsigned long delay, |
1968 | bool cd_irq) | |
1969 | { | |
1970 | #ifdef CONFIG_MMC_DEBUG | |
1971 | unsigned long flags; | |
1972 | spin_lock_irqsave(&host->lock, flags); | |
1973 | WARN_ON(host->removed); | |
1974 | spin_unlock_irqrestore(&host->lock, flags); | |
1975 | #endif | |
1976 | ||
1977 | /* | |
1978 | * If the device is configured as wakeup, we prevent a new sleep for | |
1979 | * 5 s to give provision for user space to consume the event. | |
1980 | */ | |
1981 | if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) && | |
1982 | device_can_wakeup(mmc_dev(host))) | |
1983 | pm_wakeup_event(mmc_dev(host), 5000); | |
1984 | ||
1985 | host->detect_change = 1; | |
1986 | mmc_schedule_delayed_work(&host->detect, delay); | |
1987 | } | |
1988 | ||
1da177e4 LT |
1989 | /** |
1990 | * mmc_detect_change - process change of state on a MMC socket | |
1991 | * @host: host which changed state. | |
8dc00335 | 1992 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1993 | * |
67a61c48 PO |
1994 | * MMC drivers should call this when they detect a card has been |
1995 | * inserted or removed. The MMC layer will confirm that any | |
1996 | * present card is still functional, and initialize any newly | |
1997 | * inserted. | |
1da177e4 | 1998 | */ |
8dc00335 | 1999 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 2000 | { |
bbd43682 | 2001 | _mmc_detect_change(host, delay, true); |
1da177e4 | 2002 | } |
1da177e4 LT |
2003 | EXPORT_SYMBOL(mmc_detect_change); |
2004 | ||
dfe86cba AH |
2005 | void mmc_init_erase(struct mmc_card *card) |
2006 | { | |
2007 | unsigned int sz; | |
2008 | ||
2009 | if (is_power_of_2(card->erase_size)) | |
2010 | card->erase_shift = ffs(card->erase_size) - 1; | |
2011 | else | |
2012 | card->erase_shift = 0; | |
2013 | ||
2014 | /* | |
2015 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
2016 | * card. That is not desirable because it can take a long time | |
2017 | * (minutes) potentially delaying more important I/O, and also the | |
2018 | * timeout calculations become increasingly hugely over-estimated. | |
2019 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
2020 | * to that size and alignment. | |
2021 | * | |
2022 | * For SD cards that define Allocation Unit size, limit erases to one | |
c6d8fd61 GG |
2023 | * Allocation Unit at a time. |
2024 | * For MMC, have a stab at ai good value and for modern cards it will | |
2025 | * end up being 4MiB. Note that if the value is too small, it can end | |
2026 | * up taking longer to erase. Also note, erase_size is already set to | |
2027 | * High Capacity Erase Size if available when this function is called. | |
dfe86cba AH |
2028 | */ |
2029 | if (mmc_card_sd(card) && card->ssr.au) { | |
2030 | card->pref_erase = card->ssr.au; | |
2031 | card->erase_shift = ffs(card->ssr.au) - 1; | |
cc8aa7de | 2032 | } else if (card->erase_size) { |
dfe86cba AH |
2033 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; |
2034 | if (sz < 128) | |
2035 | card->pref_erase = 512 * 1024 / 512; | |
2036 | else if (sz < 512) | |
2037 | card->pref_erase = 1024 * 1024 / 512; | |
2038 | else if (sz < 1024) | |
2039 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
2040 | else | |
2041 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
2042 | if (card->pref_erase < card->erase_size) | |
2043 | card->pref_erase = card->erase_size; | |
2044 | else { | |
2045 | sz = card->pref_erase % card->erase_size; | |
2046 | if (sz) | |
2047 | card->pref_erase += card->erase_size - sz; | |
2048 | } | |
cc8aa7de CD |
2049 | } else |
2050 | card->pref_erase = 0; | |
dfe86cba AH |
2051 | } |
2052 | ||
eaa02f75 AW |
2053 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
2054 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
2055 | { |
2056 | unsigned int erase_timeout; | |
2057 | ||
7194efb8 AH |
2058 | if (arg == MMC_DISCARD_ARG || |
2059 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
2060 | erase_timeout = card->ext_csd.trim_timeout; | |
2061 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
2062 | /* High Capacity Erase Group Size uses HC timeouts */ |
2063 | if (arg == MMC_TRIM_ARG) | |
2064 | erase_timeout = card->ext_csd.trim_timeout; | |
2065 | else | |
2066 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
2067 | } else { | |
2068 | /* CSD Erase Group Size uses write timeout */ | |
2069 | unsigned int mult = (10 << card->csd.r2w_factor); | |
2070 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
2071 | unsigned int timeout_us; | |
2072 | ||
2073 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
2074 | if (card->csd.tacc_ns < 1000000) | |
2075 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
2076 | else | |
2077 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
2078 | ||
2079 | /* | |
2080 | * ios.clock is only a target. The real clock rate might be | |
2081 | * less but not that much less, so fudge it by multiplying by 2. | |
2082 | */ | |
2083 | timeout_clks <<= 1; | |
2084 | timeout_us += (timeout_clks * 1000) / | |
9eadcc05 | 2085 | (card->host->ios.clock / 1000); |
dfe86cba AH |
2086 | |
2087 | erase_timeout = timeout_us / 1000; | |
2088 | ||
2089 | /* | |
2090 | * Theoretically, the calculation could underflow so round up | |
2091 | * to 1ms in that case. | |
2092 | */ | |
2093 | if (!erase_timeout) | |
2094 | erase_timeout = 1; | |
2095 | } | |
2096 | ||
2097 | /* Multiplier for secure operations */ | |
2098 | if (arg & MMC_SECURE_ARGS) { | |
2099 | if (arg == MMC_SECURE_ERASE_ARG) | |
2100 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
2101 | else | |
2102 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
2103 | } | |
2104 | ||
2105 | erase_timeout *= qty; | |
2106 | ||
2107 | /* | |
2108 | * Ensure at least a 1 second timeout for SPI as per | |
2109 | * 'mmc_set_data_timeout()' | |
2110 | */ | |
2111 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
2112 | erase_timeout = 1000; | |
2113 | ||
eaa02f75 | 2114 | return erase_timeout; |
dfe86cba AH |
2115 | } |
2116 | ||
eaa02f75 AW |
2117 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
2118 | unsigned int arg, | |
2119 | unsigned int qty) | |
dfe86cba | 2120 | { |
eaa02f75 AW |
2121 | unsigned int erase_timeout; |
2122 | ||
dfe86cba AH |
2123 | if (card->ssr.erase_timeout) { |
2124 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
2125 | erase_timeout = card->ssr.erase_timeout * qty + |
2126 | card->ssr.erase_offset; | |
dfe86cba AH |
2127 | } else { |
2128 | /* | |
2129 | * Erase timeout not specified in SD Status Register (SSR) so | |
2130 | * use 250ms per write block. | |
2131 | */ | |
eaa02f75 | 2132 | erase_timeout = 250 * qty; |
dfe86cba AH |
2133 | } |
2134 | ||
2135 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
2136 | if (erase_timeout < 1000) |
2137 | erase_timeout = 1000; | |
2138 | ||
2139 | return erase_timeout; | |
dfe86cba AH |
2140 | } |
2141 | ||
eaa02f75 AW |
2142 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
2143 | unsigned int arg, | |
2144 | unsigned int qty) | |
dfe86cba AH |
2145 | { |
2146 | if (mmc_card_sd(card)) | |
eaa02f75 | 2147 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 2148 | else |
eaa02f75 | 2149 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
2150 | } |
2151 | ||
2152 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
2153 | unsigned int to, unsigned int arg) | |
2154 | { | |
1278dba1 | 2155 | struct mmc_command cmd = {0}; |
bb4eecf2 BW |
2156 | unsigned int qty = 0, busy_timeout = 0; |
2157 | bool use_r1b_resp = false; | |
8fee476b | 2158 | unsigned long timeout; |
dfe86cba AH |
2159 | int err; |
2160 | ||
8f11d106 AH |
2161 | mmc_retune_hold(card->host); |
2162 | ||
dfe86cba AH |
2163 | /* |
2164 | * qty is used to calculate the erase timeout which depends on how many | |
2165 | * erase groups (or allocation units in SD terminology) are affected. | |
2166 | * We count erasing part of an erase group as one erase group. | |
2167 | * For SD, the allocation units are always a power of 2. For MMC, the | |
2168 | * erase group size is almost certainly also power of 2, but it does not | |
2169 | * seem to insist on that in the JEDEC standard, so we fall back to | |
2170 | * division in that case. SD may not specify an allocation unit size, | |
2171 | * in which case the timeout is based on the number of write blocks. | |
2172 | * | |
2173 | * Note that the timeout for secure trim 2 will only be correct if the | |
2174 | * number of erase groups specified is the same as the total of all | |
2175 | * preceding secure trim 1 commands. Since the power may have been | |
2176 | * lost since the secure trim 1 commands occurred, it is generally | |
2177 | * impossible to calculate the secure trim 2 timeout correctly. | |
2178 | */ | |
2179 | if (card->erase_shift) | |
2180 | qty += ((to >> card->erase_shift) - | |
2181 | (from >> card->erase_shift)) + 1; | |
2182 | else if (mmc_card_sd(card)) | |
2183 | qty += to - from + 1; | |
2184 | else | |
2185 | qty += ((to / card->erase_size) - | |
2186 | (from / card->erase_size)) + 1; | |
2187 | ||
2188 | if (!mmc_card_blockaddr(card)) { | |
2189 | from <<= 9; | |
2190 | to <<= 9; | |
2191 | } | |
2192 | ||
dfe86cba AH |
2193 | if (mmc_card_sd(card)) |
2194 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
2195 | else | |
2196 | cmd.opcode = MMC_ERASE_GROUP_START; | |
2197 | cmd.arg = from; | |
2198 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2199 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2200 | if (err) { | |
a3c76eb9 | 2201 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 2202 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 2203 | err = -EIO; |
dfe86cba AH |
2204 | goto out; |
2205 | } | |
2206 | ||
2207 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2208 | if (mmc_card_sd(card)) | |
2209 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
2210 | else | |
2211 | cmd.opcode = MMC_ERASE_GROUP_END; | |
2212 | cmd.arg = to; | |
2213 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2214 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2215 | if (err) { | |
a3c76eb9 | 2216 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 2217 | err, cmd.resp[0]); |
67716327 | 2218 | err = -EIO; |
dfe86cba AH |
2219 | goto out; |
2220 | } | |
2221 | ||
2222 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2223 | cmd.opcode = MMC_ERASE; | |
2224 | cmd.arg = arg; | |
bb4eecf2 BW |
2225 | busy_timeout = mmc_erase_timeout(card, arg, qty); |
2226 | /* | |
2227 | * If the host controller supports busy signalling and the timeout for | |
2228 | * the erase operation does not exceed the max_busy_timeout, we should | |
2229 | * use R1B response. Or we need to prevent the host from doing hw busy | |
2230 | * detection, which is done by converting to a R1 response instead. | |
2231 | */ | |
2232 | if (card->host->max_busy_timeout && | |
2233 | busy_timeout > card->host->max_busy_timeout) { | |
2234 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2235 | } else { | |
2236 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
2237 | cmd.busy_timeout = busy_timeout; | |
2238 | use_r1b_resp = true; | |
2239 | } | |
2240 | ||
dfe86cba AH |
2241 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
2242 | if (err) { | |
a3c76eb9 | 2243 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
2244 | err, cmd.resp[0]); |
2245 | err = -EIO; | |
2246 | goto out; | |
2247 | } | |
2248 | ||
2249 | if (mmc_host_is_spi(card->host)) | |
2250 | goto out; | |
2251 | ||
bb4eecf2 BW |
2252 | /* |
2253 | * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling | |
2254 | * shall be avoided. | |
2255 | */ | |
2256 | if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) | |
2257 | goto out; | |
2258 | ||
2259 | timeout = jiffies + msecs_to_jiffies(busy_timeout); | |
dfe86cba AH |
2260 | do { |
2261 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2262 | cmd.opcode = MMC_SEND_STATUS; | |
2263 | cmd.arg = card->rca << 16; | |
2264 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
2265 | /* Do not retry else we can't see errors */ | |
2266 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2267 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 2268 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
2269 | err, cmd.resp[0]); |
2270 | err = -EIO; | |
2271 | goto out; | |
2272 | } | |
8fee476b TR |
2273 | |
2274 | /* Timeout if the device never becomes ready for data and | |
2275 | * never leaves the program state. | |
2276 | */ | |
2277 | if (time_after(jiffies, timeout)) { | |
2278 | pr_err("%s: Card stuck in programming state! %s\n", | |
2279 | mmc_hostname(card->host), __func__); | |
2280 | err = -EIO; | |
2281 | goto out; | |
2282 | } | |
2283 | ||
dfe86cba | 2284 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || |
8fee476b | 2285 | (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)); |
dfe86cba | 2286 | out: |
8f11d106 | 2287 | mmc_retune_release(card->host); |
dfe86cba AH |
2288 | return err; |
2289 | } | |
2290 | ||
d1490fb8 BW |
2291 | static unsigned int mmc_align_erase_size(struct mmc_card *card, |
2292 | unsigned int *from, | |
2293 | unsigned int *to, | |
2294 | unsigned int nr) | |
2295 | { | |
2296 | unsigned int from_new = *from, nr_new = nr, rem; | |
2297 | ||
9acb5497 BW |
2298 | /* |
2299 | * When the 'card->erase_size' is power of 2, we can use round_up/down() | |
2300 | * to align the erase size efficiently. | |
2301 | */ | |
2302 | if (is_power_of_2(card->erase_size)) { | |
2303 | unsigned int temp = from_new; | |
2304 | ||
2305 | from_new = round_up(temp, card->erase_size); | |
2306 | rem = from_new - temp; | |
2307 | ||
d1490fb8 BW |
2308 | if (nr_new > rem) |
2309 | nr_new -= rem; | |
2310 | else | |
2311 | return 0; | |
d1490fb8 | 2312 | |
9acb5497 BW |
2313 | nr_new = round_down(nr_new, card->erase_size); |
2314 | } else { | |
2315 | rem = from_new % card->erase_size; | |
2316 | if (rem) { | |
2317 | rem = card->erase_size - rem; | |
2318 | from_new += rem; | |
2319 | if (nr_new > rem) | |
2320 | nr_new -= rem; | |
2321 | else | |
2322 | return 0; | |
2323 | } | |
2324 | ||
2325 | rem = nr_new % card->erase_size; | |
2326 | if (rem) | |
2327 | nr_new -= rem; | |
2328 | } | |
d1490fb8 BW |
2329 | |
2330 | if (nr_new == 0) | |
2331 | return 0; | |
2332 | ||
2333 | *to = from_new + nr_new; | |
2334 | *from = from_new; | |
2335 | ||
2336 | return nr_new; | |
2337 | } | |
2338 | ||
dfe86cba AH |
2339 | /** |
2340 | * mmc_erase - erase sectors. | |
2341 | * @card: card to erase | |
2342 | * @from: first sector to erase | |
2343 | * @nr: number of sectors to erase | |
2344 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
2345 | * | |
2346 | * Caller must claim host before calling this function. | |
2347 | */ | |
2348 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
2349 | unsigned int arg) | |
2350 | { | |
2351 | unsigned int rem, to = from + nr; | |
642c28ab | 2352 | int err; |
dfe86cba AH |
2353 | |
2354 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
2355 | !(card->csd.cmdclass & CCC_ERASE)) | |
2356 | return -EOPNOTSUPP; | |
2357 | ||
2358 | if (!card->erase_size) | |
2359 | return -EOPNOTSUPP; | |
2360 | ||
2361 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
2362 | return -EOPNOTSUPP; | |
2363 | ||
2364 | if ((arg & MMC_SECURE_ARGS) && | |
2365 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
2366 | return -EOPNOTSUPP; | |
2367 | ||
2368 | if ((arg & MMC_TRIM_ARGS) && | |
2369 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
2370 | return -EOPNOTSUPP; | |
2371 | ||
2372 | if (arg == MMC_SECURE_ERASE_ARG) { | |
2373 | if (from % card->erase_size || nr % card->erase_size) | |
2374 | return -EINVAL; | |
2375 | } | |
2376 | ||
d1490fb8 BW |
2377 | if (arg == MMC_ERASE_ARG) |
2378 | nr = mmc_align_erase_size(card, &from, &to, nr); | |
dfe86cba AH |
2379 | |
2380 | if (nr == 0) | |
2381 | return 0; | |
2382 | ||
dfe86cba AH |
2383 | if (to <= from) |
2384 | return -EINVAL; | |
2385 | ||
2386 | /* 'from' and 'to' are inclusive */ | |
2387 | to -= 1; | |
2388 | ||
642c28ab DJ |
2389 | /* |
2390 | * Special case where only one erase-group fits in the timeout budget: | |
2391 | * If the region crosses an erase-group boundary on this particular | |
2392 | * case, we will be trimming more than one erase-group which, does not | |
2393 | * fit in the timeout budget of the controller, so we need to split it | |
2394 | * and call mmc_do_erase() twice if necessary. This special case is | |
2395 | * identified by the card->eg_boundary flag. | |
2396 | */ | |
22d7e85f RG |
2397 | rem = card->erase_size - (from % card->erase_size); |
2398 | if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) { | |
642c28ab DJ |
2399 | err = mmc_do_erase(card, from, from + rem - 1, arg); |
2400 | from += rem; | |
2401 | if ((err) || (to <= from)) | |
2402 | return err; | |
2403 | } | |
2404 | ||
dfe86cba AH |
2405 | return mmc_do_erase(card, from, to, arg); |
2406 | } | |
2407 | EXPORT_SYMBOL(mmc_erase); | |
2408 | ||
2409 | int mmc_can_erase(struct mmc_card *card) | |
2410 | { | |
2411 | if ((card->host->caps & MMC_CAP_ERASE) && | |
2412 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
2413 | return 1; | |
2414 | return 0; | |
2415 | } | |
2416 | EXPORT_SYMBOL(mmc_can_erase); | |
2417 | ||
2418 | int mmc_can_trim(struct mmc_card *card) | |
2419 | { | |
b5b4ff0a SL |
2420 | if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) && |
2421 | (!(card->quirks & MMC_QUIRK_TRIM_BROKEN))) | |
dfe86cba AH |
2422 | return 1; |
2423 | return 0; | |
2424 | } | |
2425 | EXPORT_SYMBOL(mmc_can_trim); | |
2426 | ||
b3bf9153 KP |
2427 | int mmc_can_discard(struct mmc_card *card) |
2428 | { | |
2429 | /* | |
2430 | * As there's no way to detect the discard support bit at v4.5 | |
2431 | * use the s/w feature support filed. | |
2432 | */ | |
2433 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
2434 | return 1; | |
2435 | return 0; | |
2436 | } | |
2437 | EXPORT_SYMBOL(mmc_can_discard); | |
2438 | ||
d9ddd629 KP |
2439 | int mmc_can_sanitize(struct mmc_card *card) |
2440 | { | |
28302812 AH |
2441 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
2442 | return 0; | |
d9ddd629 KP |
2443 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
2444 | return 1; | |
2445 | return 0; | |
2446 | } | |
2447 | EXPORT_SYMBOL(mmc_can_sanitize); | |
2448 | ||
dfe86cba AH |
2449 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
2450 | { | |
5204d00f LC |
2451 | if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) && |
2452 | !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN)) | |
dfe86cba AH |
2453 | return 1; |
2454 | return 0; | |
2455 | } | |
2456 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
2457 | ||
2458 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
2459 | unsigned int nr) | |
2460 | { | |
2461 | if (!card->erase_size) | |
2462 | return 0; | |
2463 | if (from % card->erase_size || nr % card->erase_size) | |
2464 | return 0; | |
2465 | return 1; | |
2466 | } | |
2467 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 2468 | |
e056a1b5 AH |
2469 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
2470 | unsigned int arg) | |
2471 | { | |
2472 | struct mmc_host *host = card->host; | |
bb4eecf2 | 2473 | unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout; |
e056a1b5 | 2474 | unsigned int last_timeout = 0; |
b552e106 UH |
2475 | unsigned int max_busy_timeout = host->max_busy_timeout ? |
2476 | host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS; | |
e056a1b5 | 2477 | |
bb4eecf2 | 2478 | if (card->erase_shift) { |
e056a1b5 | 2479 | max_qty = UINT_MAX >> card->erase_shift; |
bb4eecf2 BW |
2480 | min_qty = card->pref_erase >> card->erase_shift; |
2481 | } else if (mmc_card_sd(card)) { | |
e056a1b5 | 2482 | max_qty = UINT_MAX; |
bb4eecf2 BW |
2483 | min_qty = card->pref_erase; |
2484 | } else { | |
e056a1b5 | 2485 | max_qty = UINT_MAX / card->erase_size; |
bb4eecf2 BW |
2486 | min_qty = card->pref_erase / card->erase_size; |
2487 | } | |
e056a1b5 | 2488 | |
bb4eecf2 BW |
2489 | /* |
2490 | * We should not only use 'host->max_busy_timeout' as the limitation | |
2491 | * when deciding the max discard sectors. We should set a balance value | |
2492 | * to improve the erase speed, and it can not get too long timeout at | |
2493 | * the same time. | |
2494 | * | |
2495 | * Here we set 'card->pref_erase' as the minimal discard sectors no | |
2496 | * matter what size of 'host->max_busy_timeout', but if the | |
2497 | * 'host->max_busy_timeout' is large enough for more discard sectors, | |
2498 | * then we can continue to increase the max discard sectors until we | |
b552e106 UH |
2499 | * get a balance value. In cases when the 'host->max_busy_timeout' |
2500 | * isn't specified, use the default max erase timeout. | |
bb4eecf2 | 2501 | */ |
e056a1b5 AH |
2502 | do { |
2503 | y = 0; | |
2504 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
2505 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
bb4eecf2 | 2506 | |
b552e106 | 2507 | if (qty + x > min_qty && timeout > max_busy_timeout) |
e056a1b5 | 2508 | break; |
bb4eecf2 | 2509 | |
e056a1b5 AH |
2510 | if (timeout < last_timeout) |
2511 | break; | |
2512 | last_timeout = timeout; | |
2513 | y = x; | |
2514 | } | |
2515 | qty += y; | |
2516 | } while (y); | |
2517 | ||
2518 | if (!qty) | |
2519 | return 0; | |
2520 | ||
642c28ab DJ |
2521 | /* |
2522 | * When specifying a sector range to trim, chances are we might cross | |
2523 | * an erase-group boundary even if the amount of sectors is less than | |
2524 | * one erase-group. | |
2525 | * If we can only fit one erase-group in the controller timeout budget, | |
2526 | * we have to care that erase-group boundaries are not crossed by a | |
2527 | * single trim operation. We flag that special case with "eg_boundary". | |
2528 | * In all other cases we can just decrement qty and pretend that we | |
2529 | * always touch (qty + 1) erase-groups as a simple optimization. | |
2530 | */ | |
e056a1b5 | 2531 | if (qty == 1) |
642c28ab DJ |
2532 | card->eg_boundary = 1; |
2533 | else | |
2534 | qty--; | |
e056a1b5 AH |
2535 | |
2536 | /* Convert qty to sectors */ | |
2537 | if (card->erase_shift) | |
642c28ab | 2538 | max_discard = qty << card->erase_shift; |
e056a1b5 | 2539 | else if (mmc_card_sd(card)) |
642c28ab | 2540 | max_discard = qty + 1; |
e056a1b5 | 2541 | else |
642c28ab | 2542 | max_discard = qty * card->erase_size; |
e056a1b5 AH |
2543 | |
2544 | return max_discard; | |
2545 | } | |
2546 | ||
2547 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
2548 | { | |
2549 | struct mmc_host *host = card->host; | |
2550 | unsigned int max_discard, max_trim; | |
2551 | ||
e056a1b5 AH |
2552 | /* |
2553 | * Without erase_group_def set, MMC erase timeout depends on clock | |
2554 | * frequence which can change. In that case, the best choice is | |
2555 | * just the preferred erase size. | |
2556 | */ | |
2557 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
2558 | return card->pref_erase; | |
2559 | ||
2560 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
2561 | if (mmc_can_trim(card)) { | |
2562 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
2563 | if (max_trim < max_discard) | |
2564 | max_discard = max_trim; | |
2565 | } else if (max_discard < card->erase_size) { | |
2566 | max_discard = 0; | |
2567 | } | |
2568 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
b552e106 UH |
2569 | mmc_hostname(host), max_discard, host->max_busy_timeout ? |
2570 | host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS); | |
e056a1b5 AH |
2571 | return max_discard; |
2572 | } | |
2573 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
2574 | ||
0f8d8ea6 AH |
2575 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
2576 | { | |
1278dba1 | 2577 | struct mmc_command cmd = {0}; |
0f8d8ea6 | 2578 | |
cdc99179 | 2579 | if (mmc_card_blockaddr(card) || mmc_card_ddr52(card)) |
0f8d8ea6 AH |
2580 | return 0; |
2581 | ||
0f8d8ea6 AH |
2582 | cmd.opcode = MMC_SET_BLOCKLEN; |
2583 | cmd.arg = blocklen; | |
2584 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2585 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2586 | } | |
2587 | EXPORT_SYMBOL(mmc_set_blocklen); | |
2588 | ||
67c79db8 LP |
2589 | int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount, |
2590 | bool is_rel_write) | |
2591 | { | |
2592 | struct mmc_command cmd = {0}; | |
2593 | ||
2594 | cmd.opcode = MMC_SET_BLOCK_COUNT; | |
2595 | cmd.arg = blockcount & 0x0000FFFF; | |
2596 | if (is_rel_write) | |
2597 | cmd.arg |= 1 << 31; | |
2598 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2599 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2600 | } | |
2601 | EXPORT_SYMBOL(mmc_set_blockcount); | |
2602 | ||
b2499518 AH |
2603 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
2604 | { | |
2605 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2606 | return; | |
b2499518 | 2607 | host->ops->hw_reset(host); |
b2499518 AH |
2608 | } |
2609 | ||
83533ab2 | 2610 | int mmc_hw_reset(struct mmc_host *host) |
b2499518 | 2611 | { |
f855a371 | 2612 | int ret; |
b2499518 | 2613 | |
f855a371 | 2614 | if (!host->card) |
b2499518 AH |
2615 | return -EINVAL; |
2616 | ||
f855a371 JR |
2617 | mmc_bus_get(host); |
2618 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) { | |
2619 | mmc_bus_put(host); | |
b2499518 | 2620 | return -EOPNOTSUPP; |
b2499518 AH |
2621 | } |
2622 | ||
f855a371 JR |
2623 | ret = host->bus_ops->reset(host); |
2624 | mmc_bus_put(host); | |
b2499518 | 2625 | |
4e6c7178 GG |
2626 | if (ret) |
2627 | pr_warn("%s: tried to reset card, got error %d\n", | |
2628 | mmc_hostname(host), ret); | |
b2499518 | 2629 | |
f855a371 | 2630 | return ret; |
b2499518 | 2631 | } |
b2499518 AH |
2632 | EXPORT_SYMBOL(mmc_hw_reset); |
2633 | ||
807e8e40 AR |
2634 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2635 | { | |
2636 | host->f_init = freq; | |
2637 | ||
2638 | #ifdef CONFIG_MMC_DEBUG | |
2639 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2640 | mmc_hostname(host), __func__, host->f_init); | |
2641 | #endif | |
4a065193 | 2642 | mmc_power_up(host, host->ocr_avail); |
2f94e55a | 2643 | |
b2499518 AH |
2644 | /* |
2645 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2646 | * do a hardware reset if possible. | |
2647 | */ | |
2648 | mmc_hw_reset_for_init(host); | |
2649 | ||
2f94e55a PR |
2650 | /* |
2651 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2652 | * if the card is being re-initialized, just send it. CMD52 | |
2653 | * should be ignored by SD/eMMC cards. | |
100a606d | 2654 | * Skip it if we already know that we do not support SDIO commands |
2f94e55a | 2655 | */ |
100a606d CC |
2656 | if (!(host->caps2 & MMC_CAP2_NO_SDIO)) |
2657 | sdio_reset(host); | |
2658 | ||
807e8e40 AR |
2659 | mmc_go_idle(host); |
2660 | ||
1b8d79c5 UH |
2661 | if (!(host->caps2 & MMC_CAP2_NO_SD)) |
2662 | mmc_send_if_cond(host, host->ocr_avail); | |
807e8e40 AR |
2663 | |
2664 | /* Order's important: probe SDIO, then SD, then MMC */ | |
100a606d CC |
2665 | if (!(host->caps2 & MMC_CAP2_NO_SDIO)) |
2666 | if (!mmc_attach_sdio(host)) | |
2667 | return 0; | |
2668 | ||
1b8d79c5 UH |
2669 | if (!(host->caps2 & MMC_CAP2_NO_SD)) |
2670 | if (!mmc_attach_sd(host)) | |
2671 | return 0; | |
2672 | ||
a0c3b68c SL |
2673 | if (!(host->caps2 & MMC_CAP2_NO_MMC)) |
2674 | if (!mmc_attach_mmc(host)) | |
2675 | return 0; | |
807e8e40 AR |
2676 | |
2677 | mmc_power_off(host); | |
2678 | return -EIO; | |
2679 | } | |
2680 | ||
d3049504 AH |
2681 | int _mmc_detect_card_removed(struct mmc_host *host) |
2682 | { | |
2683 | int ret; | |
2684 | ||
d3049504 AH |
2685 | if (!host->card || mmc_card_removed(host->card)) |
2686 | return 1; | |
2687 | ||
2688 | ret = host->bus_ops->alive(host); | |
1450734e KL |
2689 | |
2690 | /* | |
2691 | * Card detect status and alive check may be out of sync if card is | |
2692 | * removed slowly, when card detect switch changes while card/slot | |
2693 | * pads are still contacted in hardware (refer to "SD Card Mechanical | |
2694 | * Addendum, Appendix C: Card Detection Switch"). So reschedule a | |
2695 | * detect work 200ms later for this case. | |
2696 | */ | |
2697 | if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) { | |
2698 | mmc_detect_change(host, msecs_to_jiffies(200)); | |
2699 | pr_debug("%s: card removed too slowly\n", mmc_hostname(host)); | |
2700 | } | |
2701 | ||
d3049504 AH |
2702 | if (ret) { |
2703 | mmc_card_set_removed(host->card); | |
2704 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2705 | } | |
2706 | ||
2707 | return ret; | |
2708 | } | |
2709 | ||
2710 | int mmc_detect_card_removed(struct mmc_host *host) | |
2711 | { | |
2712 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2713 | int ret; |
d3049504 AH |
2714 | |
2715 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2716 | |
2717 | if (!card) | |
2718 | return 1; | |
2719 | ||
6067bafe | 2720 | if (!mmc_card_is_removable(host)) |
1ff2575b UH |
2721 | return 0; |
2722 | ||
f0cc9cf9 | 2723 | ret = mmc_card_removed(card); |
d3049504 AH |
2724 | /* |
2725 | * The card will be considered unchanged unless we have been asked to | |
2726 | * detect a change or host requires polling to provide card detection. | |
2727 | */ | |
b6891679 | 2728 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) |
f0cc9cf9 | 2729 | return ret; |
d3049504 AH |
2730 | |
2731 | host->detect_change = 0; | |
f0cc9cf9 UH |
2732 | if (!ret) { |
2733 | ret = _mmc_detect_card_removed(host); | |
b6891679 | 2734 | if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) { |
f0cc9cf9 UH |
2735 | /* |
2736 | * Schedule a detect work as soon as possible to let a | |
2737 | * rescan handle the card removal. | |
2738 | */ | |
2739 | cancel_delayed_work(&host->detect); | |
bbd43682 | 2740 | _mmc_detect_change(host, 0, false); |
f0cc9cf9 UH |
2741 | } |
2742 | } | |
d3049504 | 2743 | |
f0cc9cf9 | 2744 | return ret; |
d3049504 AH |
2745 | } |
2746 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2747 | ||
b93931a6 | 2748 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2749 | { |
c4028958 DH |
2750 | struct mmc_host *host = |
2751 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2752 | int i; |
4c2ef25f | 2753 | |
807e8e40 | 2754 | if (host->rescan_disable) |
4c2ef25f | 2755 | return; |
1da177e4 | 2756 | |
3339d1e3 | 2757 | /* If there is a non-removable card registered, only scan once */ |
6067bafe | 2758 | if (!mmc_card_is_removable(host) && host->rescan_entered) |
3339d1e3 JR |
2759 | return; |
2760 | host->rescan_entered = 1; | |
2761 | ||
86236813 | 2762 | if (host->trigger_card_event && host->ops->card_event) { |
d234d212 | 2763 | mmc_claim_host(host); |
86236813 | 2764 | host->ops->card_event(host); |
d234d212 | 2765 | mmc_release_host(host); |
86236813 UH |
2766 | host->trigger_card_event = false; |
2767 | } | |
2768 | ||
7ea239d9 | 2769 | mmc_bus_get(host); |
b855885e | 2770 | |
30201e7f OBC |
2771 | /* |
2772 | * if there is a _removable_ card registered, check whether it is | |
2773 | * still present | |
2774 | */ | |
6067bafe | 2775 | if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host)) |
94d89efb JS |
2776 | host->bus_ops->detect(host); |
2777 | ||
d3049504 AH |
2778 | host->detect_change = 0; |
2779 | ||
c5841798 CB |
2780 | /* |
2781 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2782 | * the card is no longer present. | |
2783 | */ | |
94d89efb | 2784 | mmc_bus_put(host); |
94d89efb JS |
2785 | mmc_bus_get(host); |
2786 | ||
2787 | /* if there still is a card present, stop here */ | |
2788 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2789 | mmc_bus_put(host); |
94d89efb JS |
2790 | goto out; |
2791 | } | |
1da177e4 | 2792 | |
94d89efb JS |
2793 | /* |
2794 | * Only we can add a new handler, so it's safe to | |
2795 | * release the lock here. | |
2796 | */ | |
2797 | mmc_bus_put(host); | |
1da177e4 | 2798 | |
d234d212 | 2799 | mmc_claim_host(host); |
6067bafe | 2800 | if (mmc_card_is_removable(host) && host->ops->get_cd && |
c1b55bfc | 2801 | host->ops->get_cd(host) == 0) { |
fa550189 UH |
2802 | mmc_power_off(host); |
2803 | mmc_release_host(host); | |
94d89efb | 2804 | goto out; |
fa550189 | 2805 | } |
1da177e4 | 2806 | |
88ae8b86 | 2807 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2808 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2809 | break; | |
06b2233a | 2810 | if (freqs[i] <= host->f_min) |
807e8e40 | 2811 | break; |
88ae8b86 | 2812 | } |
807e8e40 AR |
2813 | mmc_release_host(host); |
2814 | ||
2815 | out: | |
28f52482 AV |
2816 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2817 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2818 | } |
2819 | ||
b93931a6 | 2820 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2821 | { |
fa550189 | 2822 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2823 | host->rescan_disable = 0; |
8af465db | 2824 | host->ios.power_mode = MMC_POWER_UNDEFINED; |
8d1ffc8c UH |
2825 | |
2826 | mmc_claim_host(host); | |
a08b17be AH |
2827 | if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP) |
2828 | mmc_power_off(host); | |
2829 | else | |
4a065193 | 2830 | mmc_power_up(host, host->ocr_avail); |
8d1ffc8c UH |
2831 | mmc_release_host(host); |
2832 | ||
740a221e | 2833 | mmc_gpiod_request_cd_irq(host); |
bbd43682 | 2834 | _mmc_detect_change(host, 0, false); |
1da177e4 LT |
2835 | } |
2836 | ||
b93931a6 | 2837 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2838 | { |
3b91e550 | 2839 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2840 | unsigned long flags; |
2841 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2842 | host->removed = 1; |
1efd48b3 | 2843 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 2844 | #endif |
740a221e AH |
2845 | if (host->slot.cd_irq >= 0) |
2846 | disable_irq(host->slot.cd_irq); | |
3b91e550 | 2847 | |
d9adcc12 | 2848 | host->rescan_disable = 1; |
d9bcbf34 | 2849 | cancel_delayed_work_sync(&host->detect); |
3b91e550 | 2850 | |
da68c4eb NP |
2851 | /* clear pm flags now and let card drivers set them as needed */ |
2852 | host->pm_flags = 0; | |
2853 | ||
7ea239d9 PO |
2854 | mmc_bus_get(host); |
2855 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2856 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2857 | host->bus_ops->remove(host); |
7ea239d9 PO |
2858 | mmc_claim_host(host); |
2859 | mmc_detach_bus(host); | |
7f7e4129 | 2860 | mmc_power_off(host); |
7ea239d9 | 2861 | mmc_release_host(host); |
53509f0f DK |
2862 | mmc_bus_put(host); |
2863 | return; | |
1da177e4 | 2864 | } |
7ea239d9 PO |
2865 | mmc_bus_put(host); |
2866 | ||
2867 | BUG_ON(host->card); | |
1da177e4 | 2868 | |
8d1ffc8c | 2869 | mmc_claim_host(host); |
1da177e4 | 2870 | mmc_power_off(host); |
8d1ffc8c | 2871 | mmc_release_host(host); |
1da177e4 LT |
2872 | } |
2873 | ||
12ae637f | 2874 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2875 | { |
12ae637f OBC |
2876 | int ret = 0; |
2877 | ||
bb9cab94 DD |
2878 | #ifdef CONFIG_MMC_DEBUG |
2879 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2880 | #endif | |
2881 | ||
eae1aeee AH |
2882 | mmc_bus_get(host); |
2883 | ||
5601aaf7 | 2884 | if (!host->bus_ops || host->bus_dead) { |
eae1aeee | 2885 | mmc_bus_put(host); |
12ae637f | 2886 | return -EINVAL; |
eae1aeee AH |
2887 | } |
2888 | ||
2889 | if (host->bus_ops->power_save) | |
12ae637f | 2890 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2891 | |
2892 | mmc_bus_put(host); | |
2893 | ||
2894 | mmc_power_off(host); | |
12ae637f OBC |
2895 | |
2896 | return ret; | |
eae1aeee AH |
2897 | } |
2898 | EXPORT_SYMBOL(mmc_power_save_host); | |
2899 | ||
12ae637f | 2900 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2901 | { |
12ae637f OBC |
2902 | int ret; |
2903 | ||
bb9cab94 DD |
2904 | #ifdef CONFIG_MMC_DEBUG |
2905 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2906 | #endif | |
2907 | ||
eae1aeee AH |
2908 | mmc_bus_get(host); |
2909 | ||
5601aaf7 | 2910 | if (!host->bus_ops || host->bus_dead) { |
eae1aeee | 2911 | mmc_bus_put(host); |
12ae637f | 2912 | return -EINVAL; |
eae1aeee AH |
2913 | } |
2914 | ||
69041150 | 2915 | mmc_power_up(host, host->card->ocr); |
12ae637f | 2916 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2917 | |
2918 | mmc_bus_put(host); | |
12ae637f OBC |
2919 | |
2920 | return ret; | |
eae1aeee AH |
2921 | } |
2922 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2923 | ||
881d1c25 SJ |
2924 | /* |
2925 | * Flush the cache to the non-volatile storage. | |
2926 | */ | |
2927 | int mmc_flush_cache(struct mmc_card *card) | |
2928 | { | |
881d1c25 SJ |
2929 | int err = 0; |
2930 | ||
881d1c25 SJ |
2931 | if (mmc_card_mmc(card) && |
2932 | (card->ext_csd.cache_size > 0) && | |
2933 | (card->ext_csd.cache_ctrl & 1)) { | |
2934 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2935 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2936 | if (err) | |
2937 | pr_err("%s: cache flush error %d\n", | |
2938 | mmc_hostname(card->host), err); | |
2939 | } | |
2940 | ||
2941 | return err; | |
2942 | } | |
2943 | EXPORT_SYMBOL(mmc_flush_cache); | |
2944 | ||
8dede18e | 2945 | #ifdef CONFIG_PM_SLEEP |
4c2ef25f ML |
2946 | /* Do the card removal on suspend if card is assumed removeable |
2947 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2948 | to sync the card. | |
2949 | */ | |
8dede18e UH |
2950 | static int mmc_pm_notify(struct notifier_block *notify_block, |
2951 | unsigned long mode, void *unused) | |
4c2ef25f ML |
2952 | { |
2953 | struct mmc_host *host = container_of( | |
2954 | notify_block, struct mmc_host, pm_notify); | |
2955 | unsigned long flags; | |
810caddb | 2956 | int err = 0; |
4c2ef25f ML |
2957 | |
2958 | switch (mode) { | |
2959 | case PM_HIBERNATION_PREPARE: | |
2960 | case PM_SUSPEND_PREPARE: | |
184af16b | 2961 | case PM_RESTORE_PREPARE: |
4c2ef25f ML |
2962 | spin_lock_irqsave(&host->lock, flags); |
2963 | host->rescan_disable = 1; | |
2964 | spin_unlock_irqrestore(&host->lock, flags); | |
2965 | cancel_delayed_work_sync(&host->detect); | |
2966 | ||
810caddb UH |
2967 | if (!host->bus_ops) |
2968 | break; | |
2969 | ||
2970 | /* Validate prerequisites for suspend */ | |
2971 | if (host->bus_ops->pre_suspend) | |
2972 | err = host->bus_ops->pre_suspend(host); | |
5601aaf7 | 2973 | if (!err) |
4c2ef25f ML |
2974 | break; |
2975 | ||
0db13fc2 | 2976 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2977 | host->bus_ops->remove(host); |
0db13fc2 | 2978 | mmc_claim_host(host); |
4c2ef25f | 2979 | mmc_detach_bus(host); |
7f7e4129 | 2980 | mmc_power_off(host); |
4c2ef25f ML |
2981 | mmc_release_host(host); |
2982 | host->pm_flags = 0; | |
2983 | break; | |
2984 | ||
2985 | case PM_POST_SUSPEND: | |
2986 | case PM_POST_HIBERNATION: | |
274476f8 | 2987 | case PM_POST_RESTORE: |
4c2ef25f ML |
2988 | |
2989 | spin_lock_irqsave(&host->lock, flags); | |
2990 | host->rescan_disable = 0; | |
2991 | spin_unlock_irqrestore(&host->lock, flags); | |
bbd43682 | 2992 | _mmc_detect_change(host, 0, false); |
4c2ef25f ML |
2993 | |
2994 | } | |
2995 | ||
2996 | return 0; | |
2997 | } | |
8dede18e UH |
2998 | |
2999 | void mmc_register_pm_notifier(struct mmc_host *host) | |
3000 | { | |
3001 | host->pm_notify.notifier_call = mmc_pm_notify; | |
3002 | register_pm_notifier(&host->pm_notify); | |
3003 | } | |
3004 | ||
3005 | void mmc_unregister_pm_notifier(struct mmc_host *host) | |
3006 | { | |
3007 | unregister_pm_notifier(&host->pm_notify); | |
3008 | } | |
1da177e4 LT |
3009 | #endif |
3010 | ||
2220eedf KD |
3011 | /** |
3012 | * mmc_init_context_info() - init synchronization context | |
3013 | * @host: mmc host | |
3014 | * | |
3015 | * Init struct context_info needed to implement asynchronous | |
3016 | * request mechanism, used by mmc core, host driver and mmc requests | |
3017 | * supplier. | |
3018 | */ | |
3019 | void mmc_init_context_info(struct mmc_host *host) | |
3020 | { | |
3021 | spin_lock_init(&host->context_info.lock); | |
3022 | host->context_info.is_new_req = false; | |
3023 | host->context_info.is_done_rcv = false; | |
3024 | host->context_info.is_waiting_last_req = false; | |
3025 | init_waitqueue_head(&host->context_info.wait); | |
3026 | } | |
3027 | ||
ffce2e7e PO |
3028 | static int __init mmc_init(void) |
3029 | { | |
3030 | int ret; | |
3031 | ||
ffce2e7e | 3032 | ret = mmc_register_bus(); |
e29a7d73 | 3033 | if (ret) |
520bd7a8 | 3034 | return ret; |
e29a7d73 PO |
3035 | |
3036 | ret = mmc_register_host_class(); | |
3037 | if (ret) | |
3038 | goto unregister_bus; | |
3039 | ||
3040 | ret = sdio_register_bus(); | |
3041 | if (ret) | |
3042 | goto unregister_host_class; | |
3043 | ||
3044 | return 0; | |
3045 | ||
3046 | unregister_host_class: | |
3047 | mmc_unregister_host_class(); | |
3048 | unregister_bus: | |
3049 | mmc_unregister_bus(); | |
ffce2e7e PO |
3050 | return ret; |
3051 | } | |
3052 | ||
3053 | static void __exit mmc_exit(void) | |
3054 | { | |
e29a7d73 | 3055 | sdio_unregister_bus(); |
ffce2e7e PO |
3056 | mmc_unregister_host_class(); |
3057 | mmc_unregister_bus(); | |
ffce2e7e PO |
3058 | } |
3059 | ||
26074962 | 3060 | subsys_initcall(mmc_init); |
ffce2e7e PO |
3061 | module_exit(mmc_exit); |
3062 | ||
1da177e4 | 3063 | MODULE_LICENSE("GPL"); |