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" |
4facdde1 | 43 | #include "card.h" |
ffce2e7e PO |
44 | #include "bus.h" |
45 | #include "host.h" | |
e29a7d73 | 46 | #include "sdio_bus.h" |
3aa8793f | 47 | #include "pwrseq.h" |
da7fbe58 PO |
48 | |
49 | #include "mmc_ops.h" | |
50 | #include "sd_ops.h" | |
5c4e6f13 | 51 | #include "sdio_ops.h" |
1da177e4 | 52 | |
8fee476b TR |
53 | /* If the device is not responding */ |
54 | #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */ | |
55 | ||
12182aff UH |
56 | /* The max erase timeout, used when host->max_busy_timeout isn't specified */ |
57 | #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */ | |
58 | ||
fa550189 | 59 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 60 | |
af517150 DB |
61 | /* |
62 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
63 | * performance cost, and for other reasons may not always be desired. | |
64 | * So we allow it it to be disabled. | |
65 | */ | |
90ab5ee9 | 66 | bool use_spi_crc = 1; |
af517150 DB |
67 | module_param(use_spi_crc, bool, 0); |
68 | ||
c3d53d0d AH |
69 | #ifdef CONFIG_MMC_MQ_DEFAULT |
70 | bool mmc_use_blk_mq = true; | |
71 | #else | |
72 | bool mmc_use_blk_mq = false; | |
73 | #endif | |
74 | module_param_named(use_blk_mq, mmc_use_blk_mq, bool, S_IWUSR | S_IRUGO); | |
75 | ||
ffce2e7e PO |
76 | static int mmc_schedule_delayed_work(struct delayed_work *work, |
77 | unsigned long delay) | |
78 | { | |
520bd7a8 UH |
79 | /* |
80 | * We use the system_freezable_wq, because of two reasons. | |
81 | * First, it allows several works (not the same work item) to be | |
82 | * executed simultaneously. Second, the queue becomes frozen when | |
83 | * userspace becomes frozen during system PM. | |
84 | */ | |
85 | return queue_delayed_work(system_freezable_wq, work, delay); | |
ffce2e7e PO |
86 | } |
87 | ||
1b676f70 PF |
88 | #ifdef CONFIG_FAIL_MMC_REQUEST |
89 | ||
90 | /* | |
91 | * Internal function. Inject random data errors. | |
92 | * If mmc_data is NULL no errors are injected. | |
93 | */ | |
94 | static void mmc_should_fail_request(struct mmc_host *host, | |
95 | struct mmc_request *mrq) | |
96 | { | |
97 | struct mmc_command *cmd = mrq->cmd; | |
98 | struct mmc_data *data = mrq->data; | |
99 | static const int data_errors[] = { | |
100 | -ETIMEDOUT, | |
101 | -EILSEQ, | |
102 | -EIO, | |
103 | }; | |
104 | ||
105 | if (!data) | |
106 | return; | |
107 | ||
108 | if (cmd->error || data->error || | |
109 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
110 | return; | |
111 | ||
2e744fcb AM |
112 | data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)]; |
113 | data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9; | |
1b676f70 PF |
114 | } |
115 | ||
116 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
117 | ||
118 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
119 | struct mmc_request *mrq) | |
120 | { | |
121 | } | |
122 | ||
123 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
124 | ||
5163af5a AH |
125 | static inline void mmc_complete_cmd(struct mmc_request *mrq) |
126 | { | |
127 | if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion)) | |
128 | complete_all(&mrq->cmd_completion); | |
129 | } | |
130 | ||
131 | void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq) | |
132 | { | |
133 | if (!mrq->cap_cmd_during_tfr) | |
134 | return; | |
135 | ||
136 | mmc_complete_cmd(mrq); | |
137 | ||
138 | pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n", | |
139 | mmc_hostname(host), mrq->cmd->opcode); | |
140 | } | |
141 | EXPORT_SYMBOL(mmc_command_done); | |
142 | ||
1da177e4 | 143 | /** |
fe10c6ab RK |
144 | * mmc_request_done - finish processing an MMC request |
145 | * @host: MMC host which completed request | |
146 | * @mrq: MMC request which request | |
1da177e4 LT |
147 | * |
148 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 149 | * their processing of a request. |
1da177e4 LT |
150 | */ |
151 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
152 | { | |
153 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
154 | int err = cmd->error; |
155 | ||
bd11e8bd | 156 | /* Flag re-tuning needed on CRC errors */ |
031277d4 CJ |
157 | if ((cmd->opcode != MMC_SEND_TUNING_BLOCK && |
158 | cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) && | |
159 | (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) || | |
bd11e8bd | 160 | (mrq->data && mrq->data->error == -EILSEQ) || |
031277d4 | 161 | (mrq->stop && mrq->stop->error == -EILSEQ))) |
bd11e8bd AH |
162 | mmc_retune_needed(host); |
163 | ||
af517150 DB |
164 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
165 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
166 | cmd->retries = 0; | |
167 | } | |
168 | ||
5163af5a AH |
169 | if (host->ongoing_mrq == mrq) |
170 | host->ongoing_mrq = NULL; | |
171 | ||
172 | mmc_complete_cmd(mrq); | |
173 | ||
7962fc37 BW |
174 | trace_mmc_request_done(host, mrq); |
175 | ||
67b8360a LW |
176 | /* |
177 | * We list various conditions for the command to be considered | |
178 | * properly done: | |
179 | * | |
180 | * - There was no error, OK fine then | |
181 | * - We are not doing some kind of retry | |
182 | * - The card was removed (...so just complete everything no matter | |
183 | * if there are errors or retries) | |
184 | */ | |
185 | if (!err || !cmd->retries || mmc_card_removed(host->card)) { | |
1b676f70 PF |
186 | mmc_should_fail_request(host, mrq); |
187 | ||
5163af5a AH |
188 | if (!host->ongoing_mrq) |
189 | led_trigger_event(host->led, LED_OFF); | |
af8350c7 | 190 | |
fc75b708 AG |
191 | if (mrq->sbc) { |
192 | pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n", | |
193 | mmc_hostname(host), mrq->sbc->opcode, | |
194 | mrq->sbc->error, | |
195 | mrq->sbc->resp[0], mrq->sbc->resp[1], | |
196 | mrq->sbc->resp[2], mrq->sbc->resp[3]); | |
197 | } | |
198 | ||
e4d21708 PO |
199 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
200 | mmc_hostname(host), cmd->opcode, err, | |
201 | cmd->resp[0], cmd->resp[1], | |
202 | cmd->resp[2], cmd->resp[3]); | |
203 | ||
204 | if (mrq->data) { | |
205 | pr_debug("%s: %d bytes transferred: %d\n", | |
206 | mmc_hostname(host), | |
207 | mrq->data->bytes_xfered, mrq->data->error); | |
208 | } | |
209 | ||
210 | if (mrq->stop) { | |
211 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
212 | mmc_hostname(host), mrq->stop->opcode, | |
213 | mrq->stop->error, | |
214 | mrq->stop->resp[0], mrq->stop->resp[1], | |
215 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
216 | } | |
1da177e4 | 217 | } |
67b8360a LW |
218 | /* |
219 | * Request starter must handle retries - see | |
220 | * mmc_wait_for_req_done(). | |
221 | */ | |
222 | if (mrq->done) | |
223 | mrq->done(mrq); | |
1da177e4 LT |
224 | } |
225 | ||
226 | EXPORT_SYMBOL(mmc_request_done); | |
227 | ||
90a81489 AH |
228 | static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
229 | { | |
230 | int err; | |
231 | ||
232 | /* Assumes host controller has been runtime resumed by mmc_claim_host */ | |
233 | err = mmc_retune(host); | |
234 | if (err) { | |
235 | mrq->cmd->error = err; | |
236 | mmc_request_done(host, mrq); | |
237 | return; | |
238 | } | |
239 | ||
5d3f6ef0 HG |
240 | /* |
241 | * For sdio rw commands we must wait for card busy otherwise some | |
242 | * sdio devices won't work properly. | |
f328c76e | 243 | * And bypass I/O abort, reset and bus suspend operations. |
5d3f6ef0 | 244 | */ |
f328c76e | 245 | if (sdio_is_io_busy(mrq->cmd->opcode, mrq->cmd->arg) && |
246 | host->ops->card_busy) { | |
5d3f6ef0 HG |
247 | int tries = 500; /* Wait aprox 500ms at maximum */ |
248 | ||
249 | while (host->ops->card_busy(host) && --tries) | |
250 | mmc_delay(1); | |
251 | ||
252 | if (tries == 0) { | |
253 | mrq->cmd->error = -EBUSY; | |
254 | mmc_request_done(host, mrq); | |
255 | return; | |
256 | } | |
257 | } | |
258 | ||
5163af5a AH |
259 | if (mrq->cap_cmd_during_tfr) { |
260 | host->ongoing_mrq = mrq; | |
261 | /* | |
262 | * Retry path could come through here without having waiting on | |
263 | * cmd_completion, so ensure it is reinitialised. | |
264 | */ | |
265 | reinit_completion(&mrq->cmd_completion); | |
266 | } | |
267 | ||
7962fc37 BW |
268 | trace_mmc_request_start(host, mrq); |
269 | ||
3e207c8c AH |
270 | if (host->cqe_on) |
271 | host->cqe_ops->cqe_off(host); | |
272 | ||
90a81489 AH |
273 | host->ops->request(host, mrq); |
274 | } | |
275 | ||
72a5af55 AH |
276 | static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq, |
277 | bool cqe) | |
1da177e4 | 278 | { |
7b2fd4f2 JC |
279 | if (mrq->sbc) { |
280 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
281 | mmc_hostname(host), mrq->sbc->opcode, | |
282 | mrq->sbc->arg, mrq->sbc->flags); | |
283 | } | |
284 | ||
4b67e63f | 285 | if (mrq->cmd) { |
72a5af55 AH |
286 | pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n", |
287 | mmc_hostname(host), cqe ? "CQE direct " : "", | |
288 | mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); | |
289 | } else if (cqe) { | |
290 | pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n", | |
291 | mmc_hostname(host), mrq->tag, mrq->data->blk_addr); | |
4b67e63f | 292 | } |
1da177e4 | 293 | |
e4d21708 PO |
294 | if (mrq->data) { |
295 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
296 | "tsac %d ms nsac %d\n", | |
297 | mmc_hostname(host), mrq->data->blksz, | |
298 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 299 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
300 | mrq->data->timeout_clks); |
301 | } | |
302 | ||
303 | if (mrq->stop) { | |
304 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
305 | mmc_hostname(host), mrq->stop->opcode, | |
306 | mrq->stop->arg, mrq->stop->flags); | |
307 | } | |
4b67e63f AH |
308 | } |
309 | ||
f34bdd2f | 310 | static int mmc_mrq_prep(struct mmc_host *host, struct mmc_request *mrq) |
4b67e63f | 311 | { |
b044b1bc | 312 | unsigned int i, sz = 0; |
4b67e63f | 313 | struct scatterlist *sg; |
1da177e4 | 314 | |
f34bdd2f AH |
315 | if (mrq->cmd) { |
316 | mrq->cmd->error = 0; | |
317 | mrq->cmd->mrq = mrq; | |
318 | mrq->cmd->data = mrq->data; | |
319 | } | |
cce411e6 AG |
320 | if (mrq->sbc) { |
321 | mrq->sbc->error = 0; | |
322 | mrq->sbc->mrq = mrq; | |
323 | } | |
1da177e4 | 324 | if (mrq->data) { |
6ff897ff SL |
325 | if (mrq->data->blksz > host->max_blk_size || |
326 | mrq->data->blocks > host->max_blk_count || | |
327 | mrq->data->blocks * mrq->data->blksz > host->max_req_size) | |
328 | return -EINVAL; | |
b044b1bc | 329 | |
a84756c5 PO |
330 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
331 | sz += sg->length; | |
6ff897ff SL |
332 | if (sz != mrq->data->blocks * mrq->data->blksz) |
333 | return -EINVAL; | |
b044b1bc | 334 | |
1da177e4 LT |
335 | mrq->data->error = 0; |
336 | mrq->data->mrq = mrq; | |
337 | if (mrq->stop) { | |
338 | mrq->data->stop = mrq->stop; | |
339 | mrq->stop->error = 0; | |
340 | mrq->stop->mrq = mrq; | |
341 | } | |
342 | } | |
f34bdd2f AH |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
cb39f61e | 347 | int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
f34bdd2f AH |
348 | { |
349 | int err; | |
350 | ||
351 | mmc_retune_hold(host); | |
352 | ||
353 | if (mmc_card_removed(host->card)) | |
354 | return -ENOMEDIUM; | |
355 | ||
72a5af55 | 356 | mmc_mrq_pr_debug(host, mrq, false); |
f34bdd2f AH |
357 | |
358 | WARN_ON(!host->claimed); | |
359 | ||
360 | err = mmc_mrq_prep(host, mrq); | |
361 | if (err) | |
362 | return err; | |
363 | ||
66c036e0 | 364 | led_trigger_event(host->led, LED_FULL); |
90a81489 | 365 | __mmc_start_request(host, mrq); |
f100c1c2 AH |
366 | |
367 | return 0; | |
1da177e4 | 368 | } |
cb39f61e | 369 | EXPORT_SYMBOL(mmc_start_request); |
1da177e4 | 370 | |
2220eedf KD |
371 | /* |
372 | * mmc_wait_data_done() - done callback for data request | |
373 | * @mrq: done data request | |
374 | * | |
375 | * Wakes up mmc context, passed as a callback to host controller driver | |
376 | */ | |
377 | static void mmc_wait_data_done(struct mmc_request *mrq) | |
378 | { | |
71f8a4b8 JF |
379 | struct mmc_context_info *context_info = &mrq->host->context_info; |
380 | ||
381 | context_info->is_done_rcv = true; | |
382 | wake_up_interruptible(&context_info->wait); | |
2220eedf KD |
383 | } |
384 | ||
1da177e4 LT |
385 | static void mmc_wait_done(struct mmc_request *mrq) |
386 | { | |
aa8b683a PF |
387 | complete(&mrq->completion); |
388 | } | |
389 | ||
5163af5a AH |
390 | static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host) |
391 | { | |
392 | struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq); | |
393 | ||
394 | /* | |
395 | * If there is an ongoing transfer, wait for the command line to become | |
396 | * available. | |
397 | */ | |
398 | if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion)) | |
399 | wait_for_completion(&ongoing_mrq->cmd_completion); | |
400 | } | |
401 | ||
2220eedf KD |
402 | /* |
403 | *__mmc_start_data_req() - starts data request | |
404 | * @host: MMC host to start the request | |
405 | * @mrq: data request to start | |
406 | * | |
407 | * Sets the done callback to be called when request is completed by the card. | |
408 | * Starts data mmc request execution | |
5163af5a AH |
409 | * If an ongoing transfer is already in progress, wait for the command line |
410 | * to become available before sending another command. | |
2220eedf KD |
411 | */ |
412 | static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq) | |
413 | { | |
f100c1c2 AH |
414 | int err; |
415 | ||
5163af5a AH |
416 | mmc_wait_ongoing_tfr_cmd(host); |
417 | ||
2220eedf KD |
418 | mrq->done = mmc_wait_data_done; |
419 | mrq->host = host; | |
f100c1c2 | 420 | |
5163af5a AH |
421 | init_completion(&mrq->cmd_completion); |
422 | ||
f100c1c2 AH |
423 | err = mmc_start_request(host, mrq); |
424 | if (err) { | |
425 | mrq->cmd->error = err; | |
5163af5a | 426 | mmc_complete_cmd(mrq); |
9b844961 | 427 | mmc_wait_data_done(mrq); |
2220eedf | 428 | } |
2220eedf | 429 | |
f100c1c2 | 430 | return err; |
2220eedf KD |
431 | } |
432 | ||
956d9fd5 | 433 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 434 | { |
f100c1c2 AH |
435 | int err; |
436 | ||
5163af5a AH |
437 | mmc_wait_ongoing_tfr_cmd(host); |
438 | ||
aa8b683a PF |
439 | init_completion(&mrq->completion); |
440 | mrq->done = mmc_wait_done; | |
f100c1c2 | 441 | |
5163af5a AH |
442 | init_completion(&mrq->cmd_completion); |
443 | ||
f100c1c2 AH |
444 | err = mmc_start_request(host, mrq); |
445 | if (err) { | |
446 | mrq->cmd->error = err; | |
5163af5a | 447 | mmc_complete_cmd(mrq); |
d3049504 | 448 | complete(&mrq->completion); |
d3049504 | 449 | } |
f100c1c2 AH |
450 | |
451 | return err; | |
aa8b683a PF |
452 | } |
453 | ||
5163af5a | 454 | void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 455 | { |
08a7e1df AH |
456 | struct mmc_command *cmd; |
457 | ||
458 | while (1) { | |
459 | wait_for_completion(&mrq->completion); | |
460 | ||
461 | cmd = mrq->cmd; | |
775a9362 ME |
462 | |
463 | /* | |
464 | * If host has timed out waiting for the sanitize | |
465 | * to complete, card might be still in programming state | |
466 | * so let's try to bring the card out of programming | |
467 | * state. | |
468 | */ | |
469 | if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) { | |
470 | if (!mmc_interrupt_hpi(host->card)) { | |
6606110d JP |
471 | pr_warn("%s: %s: Interrupted sanitize\n", |
472 | mmc_hostname(host), __func__); | |
775a9362 ME |
473 | cmd->error = 0; |
474 | break; | |
475 | } else { | |
476 | pr_err("%s: %s: Failed to interrupt sanitize\n", | |
477 | mmc_hostname(host), __func__); | |
478 | } | |
479 | } | |
d3049504 AH |
480 | if (!cmd->error || !cmd->retries || |
481 | mmc_card_removed(host->card)) | |
08a7e1df AH |
482 | break; |
483 | ||
90a81489 AH |
484 | mmc_retune_recheck(host); |
485 | ||
08a7e1df AH |
486 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", |
487 | mmc_hostname(host), cmd->opcode, cmd->error); | |
488 | cmd->retries--; | |
489 | cmd->error = 0; | |
90a81489 | 490 | __mmc_start_request(host, mrq); |
08a7e1df | 491 | } |
90a81489 AH |
492 | |
493 | mmc_retune_release(host); | |
aa8b683a | 494 | } |
5163af5a AH |
495 | EXPORT_SYMBOL(mmc_wait_for_req_done); |
496 | ||
72a5af55 AH |
497 | /* |
498 | * mmc_cqe_start_req - Start a CQE request. | |
499 | * @host: MMC host to start the request | |
500 | * @mrq: request to start | |
501 | * | |
502 | * Start the request, re-tuning if needed and it is possible. Returns an error | |
503 | * code if the request fails to start or -EBUSY if CQE is busy. | |
504 | */ | |
505 | int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq) | |
506 | { | |
507 | int err; | |
508 | ||
509 | /* | |
510 | * CQE cannot process re-tuning commands. Caller must hold retuning | |
511 | * while CQE is in use. Re-tuning can happen here only when CQE has no | |
512 | * active requests i.e. this is the first. Note, re-tuning will call | |
513 | * ->cqe_off(). | |
514 | */ | |
515 | err = mmc_retune(host); | |
516 | if (err) | |
517 | goto out_err; | |
518 | ||
519 | mrq->host = host; | |
520 | ||
521 | mmc_mrq_pr_debug(host, mrq, true); | |
522 | ||
523 | err = mmc_mrq_prep(host, mrq); | |
524 | if (err) | |
525 | goto out_err; | |
526 | ||
527 | err = host->cqe_ops->cqe_request(host, mrq); | |
528 | if (err) | |
529 | goto out_err; | |
530 | ||
531 | trace_mmc_request_start(host, mrq); | |
532 | ||
533 | return 0; | |
534 | ||
535 | out_err: | |
536 | if (mrq->cmd) { | |
537 | pr_debug("%s: failed to start CQE direct CMD%u, error %d\n", | |
538 | mmc_hostname(host), mrq->cmd->opcode, err); | |
539 | } else { | |
540 | pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n", | |
541 | mmc_hostname(host), mrq->tag, err); | |
542 | } | |
543 | return err; | |
544 | } | |
545 | EXPORT_SYMBOL(mmc_cqe_start_req); | |
546 | ||
547 | /** | |
548 | * mmc_cqe_request_done - CQE has finished processing an MMC request | |
549 | * @host: MMC host which completed request | |
550 | * @mrq: MMC request which completed | |
551 | * | |
552 | * CQE drivers should call this function when they have completed | |
553 | * their processing of a request. | |
554 | */ | |
555 | void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
556 | { | |
557 | mmc_should_fail_request(host, mrq); | |
558 | ||
559 | /* Flag re-tuning needed on CRC errors */ | |
560 | if ((mrq->cmd && mrq->cmd->error == -EILSEQ) || | |
561 | (mrq->data && mrq->data->error == -EILSEQ)) | |
562 | mmc_retune_needed(host); | |
563 | ||
564 | trace_mmc_request_done(host, mrq); | |
565 | ||
566 | if (mrq->cmd) { | |
567 | pr_debug("%s: CQE req done (direct CMD%u): %d\n", | |
568 | mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error); | |
569 | } else { | |
570 | pr_debug("%s: CQE transfer done tag %d\n", | |
571 | mmc_hostname(host), mrq->tag); | |
572 | } | |
573 | ||
574 | if (mrq->data) { | |
575 | pr_debug("%s: %d bytes transferred: %d\n", | |
576 | mmc_hostname(host), | |
577 | mrq->data->bytes_xfered, mrq->data->error); | |
578 | } | |
579 | ||
580 | mrq->done(mrq); | |
581 | } | |
582 | EXPORT_SYMBOL(mmc_cqe_request_done); | |
583 | ||
584 | /** | |
585 | * mmc_cqe_post_req - CQE post process of a completed MMC request | |
586 | * @host: MMC host | |
587 | * @mrq: MMC request to be processed | |
588 | */ | |
589 | void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq) | |
590 | { | |
591 | if (host->cqe_ops->cqe_post_req) | |
592 | host->cqe_ops->cqe_post_req(host, mrq); | |
593 | } | |
594 | EXPORT_SYMBOL(mmc_cqe_post_req); | |
595 | ||
596 | /* Arbitrary 1 second timeout */ | |
597 | #define MMC_CQE_RECOVERY_TIMEOUT 1000 | |
598 | ||
599 | /* | |
600 | * mmc_cqe_recovery - Recover from CQE errors. | |
601 | * @host: MMC host to recover | |
602 | * | |
603 | * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in | |
604 | * in eMMC, and discarding the queue in CQE. CQE must call | |
605 | * mmc_cqe_request_done() on all requests. An error is returned if the eMMC | |
606 | * fails to discard its queue. | |
607 | */ | |
608 | int mmc_cqe_recovery(struct mmc_host *host) | |
609 | { | |
610 | struct mmc_command cmd; | |
611 | int err; | |
612 | ||
613 | mmc_retune_hold_now(host); | |
614 | ||
615 | /* | |
616 | * Recovery is expected seldom, if at all, but it reduces performance, | |
617 | * so make sure it is not completely silent. | |
618 | */ | |
619 | pr_warn("%s: running CQE recovery\n", mmc_hostname(host)); | |
620 | ||
621 | host->cqe_ops->cqe_recovery_start(host); | |
622 | ||
623 | memset(&cmd, 0, sizeof(cmd)); | |
624 | cmd.opcode = MMC_STOP_TRANSMISSION, | |
625 | cmd.flags = MMC_RSP_R1B | MMC_CMD_AC, | |
626 | cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */ | |
627 | cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT, | |
628 | mmc_wait_for_cmd(host, &cmd, 0); | |
629 | ||
630 | memset(&cmd, 0, sizeof(cmd)); | |
631 | cmd.opcode = MMC_CMDQ_TASK_MGMT; | |
632 | cmd.arg = 1; /* Discard entire queue */ | |
633 | cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; | |
634 | cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */ | |
635 | cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT, | |
636 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
637 | ||
638 | host->cqe_ops->cqe_recovery_finish(host); | |
639 | ||
640 | mmc_retune_release(host); | |
641 | ||
642 | return err; | |
643 | } | |
644 | EXPORT_SYMBOL(mmc_cqe_recovery); | |
645 | ||
5163af5a AH |
646 | /** |
647 | * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done | |
648 | * @host: MMC host | |
649 | * @mrq: MMC request | |
650 | * | |
651 | * mmc_is_req_done() is used with requests that have | |
652 | * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after | |
653 | * starting a request and before waiting for it to complete. That is, | |
654 | * either in between calls to mmc_start_req(), or after mmc_wait_for_req() | |
655 | * and before mmc_wait_for_req_done(). If it is called at other times the | |
656 | * result is not meaningful. | |
657 | */ | |
658 | bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq) | |
659 | { | |
660 | if (host->areq) | |
661 | return host->context_info.is_done_rcv; | |
662 | else | |
663 | return completion_done(&mrq->completion); | |
664 | } | |
665 | EXPORT_SYMBOL(mmc_is_req_done); | |
aa8b683a | 666 | |
37dac068 LW |
667 | /** |
668 | * mmc_finalize_areq() - finalize an asynchronous request | |
669 | * @host: MMC host to finalize any ongoing request on | |
670 | * | |
671 | * Returns the status of the ongoing asynchronous request, but | |
672 | * MMC_BLK_SUCCESS if no request was going on. | |
673 | */ | |
674 | static enum mmc_blk_status mmc_finalize_areq(struct mmc_host *host) | |
675 | { | |
0e72f95b | 676 | struct mmc_context_info *context_info = &host->context_info; |
37dac068 LW |
677 | enum mmc_blk_status status; |
678 | ||
679 | if (!host->areq) | |
680 | return MMC_BLK_SUCCESS; | |
681 | ||
0e72f95b LW |
682 | while (1) { |
683 | wait_event_interruptible(context_info->wait, | |
684 | (context_info->is_done_rcv || | |
685 | context_info->is_new_req)); | |
686 | ||
687 | if (context_info->is_done_rcv) { | |
688 | struct mmc_command *cmd; | |
689 | ||
690 | context_info->is_done_rcv = false; | |
691 | cmd = host->areq->mrq->cmd; | |
692 | ||
693 | if (!cmd->error || !cmd->retries || | |
694 | mmc_card_removed(host->card)) { | |
695 | status = host->areq->err_check(host->card, | |
696 | host->areq); | |
697 | break; /* return status */ | |
698 | } else { | |
699 | mmc_retune_recheck(host); | |
700 | pr_info("%s: req failed (CMD%u): %d, retrying...\n", | |
701 | mmc_hostname(host), | |
702 | cmd->opcode, cmd->error); | |
703 | cmd->retries--; | |
704 | cmd->error = 0; | |
705 | __mmc_start_request(host, host->areq->mrq); | |
706 | continue; /* wait for done/new event again */ | |
707 | } | |
708 | } | |
709 | ||
710 | return MMC_BLK_NEW_REQUEST; | |
711 | } | |
712 | ||
713 | mmc_retune_release(host); | |
37dac068 LW |
714 | |
715 | /* | |
716 | * Check BKOPS urgency for each R1 response | |
717 | */ | |
718 | if (host->card && mmc_card_mmc(host->card) && | |
719 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
720 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
721 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) { | |
722 | mmc_start_bkops(host->card, true); | |
723 | } | |
724 | ||
725 | return status; | |
726 | } | |
727 | ||
aa8b683a | 728 | /** |
c3399ef5 | 729 | * mmc_start_areq - start an asynchronous request |
aa8b683a | 730 | * @host: MMC host to start command |
c3399ef5 LW |
731 | * @areq: asynchronous request to start |
732 | * @ret_stat: out parameter for status | |
aa8b683a PF |
733 | * |
734 | * Start a new MMC custom command request for a host. | |
735 | * If there is on ongoing async request wait for completion | |
736 | * of that request and start the new one and return. | |
737 | * Does not wait for the new request to complete. | |
738 | * | |
739 | * Returns the completed request, NULL in case of none completed. | |
740 | * Wait for the an ongoing request (previoulsy started) to complete and | |
741 | * return the completed request. If there is no ongoing request, NULL | |
742 | * is returned without waiting. NULL is not an error condition. | |
743 | */ | |
c3399ef5 LW |
744 | struct mmc_async_req *mmc_start_areq(struct mmc_host *host, |
745 | struct mmc_async_req *areq, | |
746 | enum mmc_blk_status *ret_stat) | |
aa8b683a | 747 | { |
37dac068 | 748 | enum mmc_blk_status status; |
956d9fd5 | 749 | int start_err = 0; |
5744d50d | 750 | struct mmc_async_req *previous = host->areq; |
aa8b683a PF |
751 | |
752 | /* Prepare a new request */ | |
753 | if (areq) | |
d3c6aac3 | 754 | mmc_pre_req(host, areq->mrq); |
aa8b683a | 755 | |
37dac068 LW |
756 | /* Finalize previous request */ |
757 | status = mmc_finalize_areq(host); | |
5744d50d LW |
758 | if (ret_stat) |
759 | *ret_stat = status; | |
37dac068 LW |
760 | |
761 | /* The previous request is still going on... */ | |
5744d50d | 762 | if (status == MMC_BLK_NEW_REQUEST) |
37dac068 | 763 | return NULL; |
aa8b683a | 764 | |
37dac068 | 765 | /* Fine so far, start the new request! */ |
8e8b3f51 | 766 | if (status == MMC_BLK_SUCCESS && areq) |
2220eedf | 767 | start_err = __mmc_start_data_req(host, areq->mrq); |
aa8b683a | 768 | |
37dac068 | 769 | /* Postprocess the old request at this point */ |
aa8b683a PF |
770 | if (host->areq) |
771 | mmc_post_req(host, host->areq->mrq, 0); | |
772 | ||
37dac068 | 773 | /* Cancel a prepared request if it was not started. */ |
8e8b3f51 | 774 | if ((status != MMC_BLK_SUCCESS || start_err) && areq) |
f5c2758f | 775 | mmc_post_req(host, areq->mrq, -EINVAL); |
956d9fd5 | 776 | |
8e8b3f51 | 777 | if (status != MMC_BLK_SUCCESS) |
956d9fd5 UH |
778 | host->areq = NULL; |
779 | else | |
780 | host->areq = areq; | |
781 | ||
5744d50d | 782 | return previous; |
aa8b683a | 783 | } |
c3399ef5 | 784 | EXPORT_SYMBOL(mmc_start_areq); |
aa8b683a | 785 | |
67a61c48 PO |
786 | /** |
787 | * mmc_wait_for_req - start a request and wait for completion | |
788 | * @host: MMC host to start command | |
789 | * @mrq: MMC request to start | |
790 | * | |
791 | * Start a new MMC custom command request for a host, and wait | |
5163af5a AH |
792 | * for the command to complete. In the case of 'cap_cmd_during_tfr' |
793 | * requests, the transfer is ongoing and the caller can issue further | |
794 | * commands that do not use the data lines, and then wait by calling | |
795 | * mmc_wait_for_req_done(). | |
796 | * Does not attempt to parse the response. | |
67a61c48 PO |
797 | */ |
798 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 799 | { |
aa8b683a | 800 | __mmc_start_req(host, mrq); |
5163af5a AH |
801 | |
802 | if (!mrq->cap_cmd_during_tfr) | |
803 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 804 | } |
1da177e4 LT |
805 | EXPORT_SYMBOL(mmc_wait_for_req); |
806 | ||
807 | /** | |
808 | * mmc_wait_for_cmd - start a command and wait for completion | |
809 | * @host: MMC host to start command | |
810 | * @cmd: MMC command to start | |
811 | * @retries: maximum number of retries | |
812 | * | |
813 | * Start a new MMC command for a host, and wait for the command | |
814 | * to complete. Return any error that occurred while the command | |
815 | * was executing. Do not attempt to parse the response. | |
816 | */ | |
817 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
818 | { | |
c7836d15 | 819 | struct mmc_request mrq = {}; |
1da177e4 | 820 | |
d84075c8 | 821 | WARN_ON(!host->claimed); |
1da177e4 | 822 | |
1da177e4 LT |
823 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
824 | cmd->retries = retries; | |
825 | ||
826 | mrq.cmd = cmd; | |
827 | cmd->data = NULL; | |
828 | ||
829 | mmc_wait_for_req(host, &mrq); | |
830 | ||
831 | return cmd->error; | |
832 | } | |
833 | ||
834 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
835 | ||
d773d725 RK |
836 | /** |
837 | * mmc_set_data_timeout - set the timeout for a data command | |
838 | * @data: data phase for command | |
839 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
840 | * |
841 | * Computes the data timeout parameters according to the | |
842 | * correct algorithm given the card type. | |
d773d725 | 843 | */ |
b146d26a | 844 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
845 | { |
846 | unsigned int mult; | |
847 | ||
e6f918bf PO |
848 | /* |
849 | * SDIO cards only define an upper 1 s limit on access. | |
850 | */ | |
851 | if (mmc_card_sdio(card)) { | |
852 | data->timeout_ns = 1000000000; | |
853 | data->timeout_clks = 0; | |
854 | return; | |
855 | } | |
856 | ||
d773d725 RK |
857 | /* |
858 | * SD cards use a 100 multiplier rather than 10 | |
859 | */ | |
860 | mult = mmc_card_sd(card) ? 100 : 10; | |
861 | ||
862 | /* | |
863 | * Scale up the multiplier (and therefore the timeout) by | |
864 | * the r2w factor for writes. | |
865 | */ | |
b146d26a | 866 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
867 | mult <<= card->csd.r2w_factor; |
868 | ||
4406ae21 SL |
869 | data->timeout_ns = card->csd.taac_ns * mult; |
870 | data->timeout_clks = card->csd.taac_clks * mult; | |
d773d725 RK |
871 | |
872 | /* | |
873 | * SD cards also have an upper limit on the timeout. | |
874 | */ | |
875 | if (mmc_card_sd(card)) { | |
876 | unsigned int timeout_us, limit_us; | |
877 | ||
878 | timeout_us = data->timeout_ns / 1000; | |
9eadcc05 | 879 | if (card->host->ios.clock) |
e9b86841 | 880 | timeout_us += data->timeout_clks * 1000 / |
9eadcc05 | 881 | (card->host->ios.clock / 1000); |
d773d725 | 882 | |
b146d26a | 883 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 884 | /* |
3bdc9ba8 PW |
885 | * The MMC spec "It is strongly recommended |
886 | * for hosts to implement more than 500ms | |
887 | * timeout value even if the card indicates | |
888 | * the 250ms maximum busy length." Even the | |
889 | * previous value of 300ms is known to be | |
890 | * insufficient for some cards. | |
493890e7 | 891 | */ |
3bdc9ba8 | 892 | limit_us = 3000000; |
d773d725 RK |
893 | else |
894 | limit_us = 100000; | |
895 | ||
fba68bd2 PL |
896 | /* |
897 | * SDHC cards always use these fixed values. | |
898 | */ | |
6ca2920d | 899 | if (timeout_us > limit_us) { |
d773d725 RK |
900 | data->timeout_ns = limit_us * 1000; |
901 | data->timeout_clks = 0; | |
902 | } | |
f7bf11a3 SW |
903 | |
904 | /* assign limit value if invalid */ | |
905 | if (timeout_us == 0) | |
906 | data->timeout_ns = limit_us * 1000; | |
d773d725 | 907 | } |
6de5fc9c SNX |
908 | |
909 | /* | |
910 | * Some cards require longer data read timeout than indicated in CSD. | |
911 | * Address this by setting the read timeout to a "reasonably high" | |
32ecd320 | 912 | * value. For the cards tested, 600ms has proven enough. If necessary, |
6de5fc9c SNX |
913 | * this value can be increased if other problematic cards require this. |
914 | */ | |
915 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
32ecd320 | 916 | data->timeout_ns = 600000000; |
6de5fc9c SNX |
917 | data->timeout_clks = 0; |
918 | } | |
919 | ||
c0c88871 WM |
920 | /* |
921 | * Some cards need very high timeouts if driven in SPI mode. | |
922 | * The worst observed timeout was 900ms after writing a | |
923 | * continuous stream of data until the internal logic | |
924 | * overflowed. | |
925 | */ | |
926 | if (mmc_host_is_spi(card->host)) { | |
927 | if (data->flags & MMC_DATA_WRITE) { | |
928 | if (data->timeout_ns < 1000000000) | |
929 | data->timeout_ns = 1000000000; /* 1s */ | |
930 | } else { | |
931 | if (data->timeout_ns < 100000000) | |
932 | data->timeout_ns = 100000000; /* 100ms */ | |
933 | } | |
934 | } | |
d773d725 RK |
935 | } |
936 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
937 | ||
ad3868b2 PO |
938 | /** |
939 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
940 | * @card: the MMC card associated with the data transfer | |
941 | * @sz: original transfer size | |
942 | * | |
943 | * Pads the original data size with a number of extra bytes in | |
944 | * order to avoid controller bugs and/or performance hits | |
945 | * (e.g. some controllers revert to PIO for certain sizes). | |
946 | * | |
947 | * Returns the improved size, which might be unmodified. | |
948 | * | |
949 | * Note that this function is only relevant when issuing a | |
950 | * single scatter gather entry. | |
951 | */ | |
952 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
953 | { | |
954 | /* | |
955 | * FIXME: We don't have a system for the controller to tell | |
956 | * the core about its problems yet, so for now we just 32-bit | |
957 | * align the size. | |
958 | */ | |
959 | sz = ((sz + 3) / 4) * 4; | |
960 | ||
961 | return sz; | |
962 | } | |
963 | EXPORT_SYMBOL(mmc_align_data_size); | |
964 | ||
6c0cedd1 AH |
965 | /* |
966 | * Allow claiming an already claimed host if the context is the same or there is | |
967 | * no context but the task is the same. | |
968 | */ | |
969 | static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx, | |
970 | struct task_struct *task) | |
971 | { | |
972 | return host->claimer == ctx || | |
973 | (!ctx && task && host->claimer->task == task); | |
974 | } | |
975 | ||
976 | static inline void mmc_ctx_set_claimer(struct mmc_host *host, | |
977 | struct mmc_ctx *ctx, | |
978 | struct task_struct *task) | |
979 | { | |
980 | if (!host->claimer) { | |
981 | if (ctx) | |
982 | host->claimer = ctx; | |
983 | else | |
984 | host->claimer = &host->default_ctx; | |
985 | } | |
986 | if (task) | |
987 | host->claimer->task = task; | |
988 | } | |
989 | ||
1da177e4 | 990 | /** |
2342f332 | 991 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 992 | * @host: mmc host to claim |
6c0cedd1 AH |
993 | * @ctx: context that claims the host or NULL in which case the default |
994 | * context will be used | |
2342f332 | 995 | * @abort: whether or not the operation should be aborted |
1da177e4 | 996 | * |
2342f332 NP |
997 | * Claim a host for a set of operations. If @abort is non null and |
998 | * dereference a non-zero value then this will return prematurely with | |
999 | * that non-zero value without acquiring the lock. Returns zero | |
1000 | * with the lock held otherwise. | |
1da177e4 | 1001 | */ |
6c0cedd1 AH |
1002 | int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx, |
1003 | atomic_t *abort) | |
1da177e4 | 1004 | { |
6c0cedd1 | 1005 | struct task_struct *task = ctx ? NULL : current; |
1da177e4 LT |
1006 | DECLARE_WAITQUEUE(wait, current); |
1007 | unsigned long flags; | |
2342f332 | 1008 | int stop; |
9250aea7 | 1009 | bool pm = false; |
1da177e4 | 1010 | |
cf795bfb PO |
1011 | might_sleep(); |
1012 | ||
1da177e4 LT |
1013 | add_wait_queue(&host->wq, &wait); |
1014 | spin_lock_irqsave(&host->lock, flags); | |
1015 | while (1) { | |
1016 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 1017 | stop = abort ? atomic_read(abort) : 0; |
6c0cedd1 | 1018 | if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task)) |
1da177e4 LT |
1019 | break; |
1020 | spin_unlock_irqrestore(&host->lock, flags); | |
1021 | schedule(); | |
1022 | spin_lock_irqsave(&host->lock, flags); | |
1023 | } | |
1024 | set_current_state(TASK_RUNNING); | |
319a3f14 | 1025 | if (!stop) { |
2342f332 | 1026 | host->claimed = 1; |
6c0cedd1 | 1027 | mmc_ctx_set_claimer(host, ctx, task); |
319a3f14 | 1028 | host->claim_cnt += 1; |
9250aea7 UH |
1029 | if (host->claim_cnt == 1) |
1030 | pm = true; | |
319a3f14 | 1031 | } else |
2342f332 | 1032 | wake_up(&host->wq); |
1da177e4 LT |
1033 | spin_unlock_irqrestore(&host->lock, flags); |
1034 | remove_wait_queue(&host->wq, &wait); | |
9250aea7 UH |
1035 | |
1036 | if (pm) | |
1037 | pm_runtime_get_sync(mmc_dev(host)); | |
1038 | ||
2342f332 | 1039 | return stop; |
1da177e4 | 1040 | } |
2342f332 | 1041 | EXPORT_SYMBOL(__mmc_claim_host); |
8ea926b2 | 1042 | |
ab1efd27 | 1043 | /** |
907d2e7c | 1044 | * mmc_release_host - release a host |
ab1efd27 UH |
1045 | * @host: mmc host to release |
1046 | * | |
907d2e7c AH |
1047 | * Release a MMC host, allowing others to claim the host |
1048 | * for their operations. | |
ab1efd27 | 1049 | */ |
907d2e7c | 1050 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
1051 | { |
1052 | unsigned long flags; | |
1053 | ||
907d2e7c AH |
1054 | WARN_ON(!host->claimed); |
1055 | ||
8ea926b2 | 1056 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
1057 | if (--host->claim_cnt) { |
1058 | /* Release for nested claim */ | |
1059 | spin_unlock_irqrestore(&host->lock, flags); | |
1060 | } else { | |
1061 | host->claimed = 0; | |
6c0cedd1 | 1062 | host->claimer->task = NULL; |
319a3f14 AH |
1063 | host->claimer = NULL; |
1064 | spin_unlock_irqrestore(&host->lock, flags); | |
1065 | wake_up(&host->wq); | |
9250aea7 UH |
1066 | pm_runtime_mark_last_busy(mmc_dev(host)); |
1067 | pm_runtime_put_autosuspend(mmc_dev(host)); | |
319a3f14 | 1068 | } |
8ea926b2 | 1069 | } |
1da177e4 LT |
1070 | EXPORT_SYMBOL(mmc_release_host); |
1071 | ||
e94cfef6 UH |
1072 | /* |
1073 | * This is a helper function, which fetches a runtime pm reference for the | |
1074 | * card device and also claims the host. | |
1075 | */ | |
6c0cedd1 | 1076 | void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx) |
e94cfef6 UH |
1077 | { |
1078 | pm_runtime_get_sync(&card->dev); | |
6c0cedd1 | 1079 | __mmc_claim_host(card->host, ctx, NULL); |
e94cfef6 UH |
1080 | } |
1081 | EXPORT_SYMBOL(mmc_get_card); | |
1082 | ||
1083 | /* | |
1084 | * This is a helper function, which releases the host and drops the runtime | |
1085 | * pm reference for the card device. | |
1086 | */ | |
6c0cedd1 | 1087 | void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx) |
e94cfef6 | 1088 | { |
6c0cedd1 AH |
1089 | struct mmc_host *host = card->host; |
1090 | ||
1091 | WARN_ON(ctx && host->claimer != ctx); | |
1092 | ||
1093 | mmc_release_host(host); | |
e94cfef6 UH |
1094 | pm_runtime_mark_last_busy(&card->dev); |
1095 | pm_runtime_put_autosuspend(&card->dev); | |
1096 | } | |
1097 | EXPORT_SYMBOL(mmc_put_card); | |
1098 | ||
7ea239d9 PO |
1099 | /* |
1100 | * Internal function that does the actual ios call to the host driver, | |
1101 | * optionally printing some debug output. | |
1102 | */ | |
920e70c5 RK |
1103 | static inline void mmc_set_ios(struct mmc_host *host) |
1104 | { | |
1105 | struct mmc_ios *ios = &host->ios; | |
1106 | ||
cd9277c0 PO |
1107 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
1108 | "width %u timing %u\n", | |
920e70c5 RK |
1109 | mmc_hostname(host), ios->clock, ios->bus_mode, |
1110 | ios->power_mode, ios->chip_select, ios->vdd, | |
ed9feec7 | 1111 | 1 << ios->bus_width, ios->timing); |
fba68bd2 | 1112 | |
920e70c5 RK |
1113 | host->ops->set_ios(host, ios); |
1114 | } | |
1115 | ||
7ea239d9 PO |
1116 | /* |
1117 | * Control chip select pin on a host. | |
1118 | */ | |
da7fbe58 | 1119 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 1120 | { |
da7fbe58 PO |
1121 | host->ios.chip_select = mode; |
1122 | mmc_set_ios(host); | |
1da177e4 LT |
1123 | } |
1124 | ||
7ea239d9 PO |
1125 | /* |
1126 | * Sets the host clock to the highest possible frequency that | |
1127 | * is below "hz". | |
1128 | */ | |
9eadcc05 | 1129 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 | 1130 | { |
6a98f1e8 | 1131 | WARN_ON(hz && hz < host->f_min); |
7ea239d9 PO |
1132 | |
1133 | if (hz > host->f_max) | |
1134 | hz = host->f_max; | |
1135 | ||
1136 | host->ios.clock = hz; | |
1137 | mmc_set_ios(host); | |
1138 | } | |
1139 | ||
63e415c6 AH |
1140 | int mmc_execute_tuning(struct mmc_card *card) |
1141 | { | |
1142 | struct mmc_host *host = card->host; | |
1143 | u32 opcode; | |
1144 | int err; | |
1145 | ||
1146 | if (!host->ops->execute_tuning) | |
1147 | return 0; | |
1148 | ||
3e207c8c AH |
1149 | if (host->cqe_on) |
1150 | host->cqe_ops->cqe_off(host); | |
1151 | ||
63e415c6 AH |
1152 | if (mmc_card_mmc(card)) |
1153 | opcode = MMC_SEND_TUNING_BLOCK_HS200; | |
1154 | else | |
1155 | opcode = MMC_SEND_TUNING_BLOCK; | |
1156 | ||
63e415c6 | 1157 | err = host->ops->execute_tuning(host, opcode); |
63e415c6 AH |
1158 | |
1159 | if (err) | |
07d97d87 RK |
1160 | pr_err("%s: tuning execution failed: %d\n", |
1161 | mmc_hostname(host), err); | |
79d5a65a AH |
1162 | else |
1163 | mmc_retune_enable(host); | |
63e415c6 AH |
1164 | |
1165 | return err; | |
1166 | } | |
1167 | ||
7ea239d9 PO |
1168 | /* |
1169 | * Change the bus mode (open drain/push-pull) of a host. | |
1170 | */ | |
1171 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
1172 | { | |
1173 | host->ios.bus_mode = mode; | |
1174 | mmc_set_ios(host); | |
1175 | } | |
1176 | ||
0f8d8ea6 AH |
1177 | /* |
1178 | * Change data bus width of a host. | |
1179 | */ | |
1180 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
1181 | { | |
4c4cb171 PR |
1182 | host->ios.bus_width = width; |
1183 | mmc_set_ios(host); | |
0f8d8ea6 AH |
1184 | } |
1185 | ||
2d079c43 JR |
1186 | /* |
1187 | * Set initial state after a power cycle or a hw_reset. | |
1188 | */ | |
1189 | void mmc_set_initial_state(struct mmc_host *host) | |
1190 | { | |
3e207c8c AH |
1191 | if (host->cqe_on) |
1192 | host->cqe_ops->cqe_off(host); | |
1193 | ||
79d5a65a AH |
1194 | mmc_retune_disable(host); |
1195 | ||
2d079c43 JR |
1196 | if (mmc_host_is_spi(host)) |
1197 | host->ios.chip_select = MMC_CS_HIGH; | |
1198 | else | |
1199 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1200 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1201 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
1202 | host->ios.timing = MMC_TIMING_LEGACY; | |
75e8a228 | 1203 | host->ios.drv_type = 0; |
81ac2af6 SL |
1204 | host->ios.enhanced_strobe = false; |
1205 | ||
1206 | /* | |
1207 | * Make sure we are in non-enhanced strobe mode before we | |
1208 | * actually enable it in ext_csd. | |
1209 | */ | |
1210 | if ((host->caps2 & MMC_CAP2_HS400_ES) && | |
1211 | host->ops->hs400_enhanced_strobe) | |
1212 | host->ops->hs400_enhanced_strobe(host, &host->ios); | |
2d079c43 JR |
1213 | |
1214 | mmc_set_ios(host); | |
1215 | } | |
1216 | ||
86e8286a AV |
1217 | /** |
1218 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
1219 | * @vdd: voltage (mV) | |
1220 | * @low_bits: prefer low bits in boundary cases | |
1221 | * | |
1222 | * This function returns the OCR bit number according to the provided @vdd | |
1223 | * value. If conversion is not possible a negative errno value returned. | |
1224 | * | |
1225 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
1226 | * on boundary voltages. For example, | |
1227 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
1228 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
1229 | * | |
1230 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
1231 | */ | |
1232 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
1233 | { | |
1234 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1235 | int bit; | |
1236 | ||
1237 | if (vdd < 1650 || vdd > 3600) | |
1238 | return -EINVAL; | |
1239 | ||
1240 | if (vdd >= 1650 && vdd <= 1950) | |
1241 | return ilog2(MMC_VDD_165_195); | |
1242 | ||
1243 | if (low_bits) | |
1244 | vdd -= 1; | |
1245 | ||
1246 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1247 | bit = (vdd - 2000) / 100 + 8; | |
1248 | if (bit > max_bit) | |
1249 | return max_bit; | |
1250 | return bit; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1255 | * @vdd_min: minimum voltage value (mV) | |
1256 | * @vdd_max: maximum voltage value (mV) | |
1257 | * | |
1258 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1259 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1260 | * | |
1261 | * Notes wrt boundary cases: | |
1262 | * This function sets the OCR bits for all boundary voltages, for example | |
1263 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1264 | * MMC_VDD_34_35 mask. | |
1265 | */ | |
1266 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1267 | { | |
1268 | u32 mask = 0; | |
1269 | ||
1270 | if (vdd_max < vdd_min) | |
1271 | return 0; | |
1272 | ||
1273 | /* Prefer high bits for the boundary vdd_max values. */ | |
1274 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1275 | if (vdd_max < 0) | |
1276 | return 0; | |
1277 | ||
1278 | /* Prefer low bits for the boundary vdd_min values. */ | |
1279 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1280 | if (vdd_min < 0) | |
1281 | return 0; | |
1282 | ||
1283 | /* Fill the mask, from max bit to min bit. */ | |
1284 | while (vdd_max >= vdd_min) | |
1285 | mask |= 1 << vdd_max--; | |
1286 | ||
1287 | return mask; | |
1288 | } | |
1289 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1290 | ||
6e9e318b HZ |
1291 | #ifdef CONFIG_OF |
1292 | ||
1293 | /** | |
1294 | * mmc_of_parse_voltage - return mask of supported voltages | |
1295 | * @np: The device node need to be parsed. | |
1296 | * @mask: mask of voltages available for MMC/SD/SDIO | |
1297 | * | |
cf925747 RK |
1298 | * Parse the "voltage-ranges" DT property, returning zero if it is not |
1299 | * found, negative errno if the voltage-range specification is invalid, | |
1300 | * or one if the voltage-range is specified and successfully parsed. | |
6e9e318b HZ |
1301 | */ |
1302 | int mmc_of_parse_voltage(struct device_node *np, u32 *mask) | |
1303 | { | |
1304 | const u32 *voltage_ranges; | |
1305 | int num_ranges, i; | |
1306 | ||
1307 | voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); | |
1308 | num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; | |
10a16a01 | 1309 | if (!voltage_ranges) { |
bf892de9 | 1310 | pr_debug("%pOF: voltage-ranges unspecified\n", np); |
cf925747 | 1311 | return 0; |
10a16a01 RK |
1312 | } |
1313 | if (!num_ranges) { | |
bf892de9 | 1314 | pr_err("%pOF: voltage-ranges empty\n", np); |
6e9e318b HZ |
1315 | return -EINVAL; |
1316 | } | |
1317 | ||
1318 | for (i = 0; i < num_ranges; i++) { | |
1319 | const int j = i * 2; | |
1320 | u32 ocr_mask; | |
1321 | ||
1322 | ocr_mask = mmc_vddrange_to_ocrmask( | |
1323 | be32_to_cpu(voltage_ranges[j]), | |
1324 | be32_to_cpu(voltage_ranges[j + 1])); | |
1325 | if (!ocr_mask) { | |
bf892de9 RH |
1326 | pr_err("%pOF: voltage-range #%d is invalid\n", |
1327 | np, i); | |
6e9e318b HZ |
1328 | return -EINVAL; |
1329 | } | |
1330 | *mask |= ocr_mask; | |
1331 | } | |
1332 | ||
cf925747 | 1333 | return 1; |
6e9e318b HZ |
1334 | } |
1335 | EXPORT_SYMBOL(mmc_of_parse_voltage); | |
1336 | ||
1337 | #endif /* CONFIG_OF */ | |
1338 | ||
25185f3f SH |
1339 | static int mmc_of_get_func_num(struct device_node *node) |
1340 | { | |
1341 | u32 reg; | |
1342 | int ret; | |
1343 | ||
1344 | ret = of_property_read_u32(node, "reg", ®); | |
1345 | if (ret < 0) | |
1346 | return ret; | |
1347 | ||
1348 | return reg; | |
1349 | } | |
1350 | ||
1351 | struct device_node *mmc_of_find_child_device(struct mmc_host *host, | |
1352 | unsigned func_num) | |
1353 | { | |
1354 | struct device_node *node; | |
1355 | ||
1356 | if (!host->parent || !host->parent->of_node) | |
1357 | return NULL; | |
1358 | ||
1359 | for_each_child_of_node(host->parent->of_node, node) { | |
1360 | if (mmc_of_get_func_num(node) == func_num) | |
1361 | return node; | |
1362 | } | |
1363 | ||
1364 | return NULL; | |
1365 | } | |
1366 | ||
5c13941a DB |
1367 | #ifdef CONFIG_REGULATOR |
1368 | ||
310c805e HS |
1369 | /** |
1370 | * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage | |
1371 | * @vdd_bit: OCR bit number | |
1372 | * @min_uV: minimum voltage value (mV) | |
1373 | * @max_uV: maximum voltage value (mV) | |
1374 | * | |
1375 | * This function returns the voltage range according to the provided OCR | |
1376 | * bit number. If conversion is not possible a negative errno value returned. | |
1377 | */ | |
1378 | static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV) | |
1379 | { | |
1380 | int tmp; | |
1381 | ||
1382 | if (!vdd_bit) | |
1383 | return -EINVAL; | |
1384 | ||
1385 | /* | |
1386 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
1387 | * bits this regulator doesn't quite support ... don't | |
1388 | * be too picky, most cards and regulators are OK with | |
1389 | * a 0.1V range goof (it's a small error percentage). | |
1390 | */ | |
1391 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1392 | if (tmp == 0) { | |
1393 | *min_uV = 1650 * 1000; | |
1394 | *max_uV = 1950 * 1000; | |
1395 | } else { | |
1396 | *min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1397 | *max_uV = *min_uV + 100 * 1000; | |
1398 | } | |
1399 | ||
1400 | return 0; | |
1401 | } | |
1402 | ||
5c13941a DB |
1403 | /** |
1404 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1405 | * @supply: regulator to use | |
1406 | * | |
1407 | * This returns either a negative errno, or a mask of voltages that | |
1408 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1409 | * regulator. This would normally be called before registering the | |
1410 | * MMC host adapter. | |
1411 | */ | |
1412 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1413 | { | |
1414 | int result = 0; | |
1415 | int count; | |
1416 | int i; | |
9ed7ca89 JMC |
1417 | int vdd_uV; |
1418 | int vdd_mV; | |
5c13941a DB |
1419 | |
1420 | count = regulator_count_voltages(supply); | |
1421 | if (count < 0) | |
1422 | return count; | |
1423 | ||
1424 | for (i = 0; i < count; i++) { | |
5c13941a DB |
1425 | vdd_uV = regulator_list_voltage(supply, i); |
1426 | if (vdd_uV <= 0) | |
1427 | continue; | |
1428 | ||
1429 | vdd_mV = vdd_uV / 1000; | |
1430 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1431 | } | |
1432 | ||
9ed7ca89 JMC |
1433 | if (!result) { |
1434 | vdd_uV = regulator_get_voltage(supply); | |
1435 | if (vdd_uV <= 0) | |
1436 | return vdd_uV; | |
1437 | ||
1438 | vdd_mV = vdd_uV / 1000; | |
1439 | result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1440 | } | |
1441 | ||
5c13941a DB |
1442 | return result; |
1443 | } | |
45a6b32e | 1444 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1445 | |
1446 | /** | |
1447 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1448 | * @mmc: the host to regulate |
5c13941a | 1449 | * @supply: regulator to use |
99fc5131 | 1450 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1451 | * |
1452 | * Returns zero on success, else negative errno. | |
1453 | * | |
1454 | * MMC host drivers may use this to enable or disable a regulator using | |
1455 | * a particular supply voltage. This would normally be called from the | |
1456 | * set_ios() method. | |
1457 | */ | |
99fc5131 LW |
1458 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1459 | struct regulator *supply, | |
1460 | unsigned short vdd_bit) | |
5c13941a DB |
1461 | { |
1462 | int result = 0; | |
1463 | int min_uV, max_uV; | |
5c13941a DB |
1464 | |
1465 | if (vdd_bit) { | |
310c805e | 1466 | mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV); |
5c13941a | 1467 | |
ca6429d4 | 1468 | result = regulator_set_voltage(supply, min_uV, max_uV); |
99fc5131 | 1469 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1470 | result = regulator_enable(supply); |
99fc5131 LW |
1471 | if (!result) |
1472 | mmc->regulator_enabled = true; | |
1473 | } | |
1474 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1475 | result = regulator_disable(supply); |
99fc5131 LW |
1476 | if (result == 0) |
1477 | mmc->regulator_enabled = false; | |
5c13941a DB |
1478 | } |
1479 | ||
99fc5131 LW |
1480 | if (result) |
1481 | dev_err(mmc_dev(mmc), | |
1482 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1483 | return result; |
1484 | } | |
45a6b32e | 1485 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1486 | |
2086f801 DA |
1487 | static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator, |
1488 | int min_uV, int target_uV, | |
1489 | int max_uV) | |
1490 | { | |
1491 | /* | |
1492 | * Check if supported first to avoid errors since we may try several | |
1493 | * signal levels during power up and don't want to show errors. | |
1494 | */ | |
1495 | if (!regulator_is_supported_voltage(regulator, min_uV, max_uV)) | |
1496 | return -EINVAL; | |
1497 | ||
1498 | return regulator_set_voltage_triplet(regulator, min_uV, target_uV, | |
1499 | max_uV); | |
1500 | } | |
1501 | ||
1502 | /** | |
1503 | * mmc_regulator_set_vqmmc - Set VQMMC as per the ios | |
1504 | * | |
1505 | * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible. | |
1506 | * That will match the behavior of old boards where VQMMC and VMMC were supplied | |
1507 | * by the same supply. The Bus Operating conditions for 3.3V signaling in the | |
1508 | * SD card spec also define VQMMC in terms of VMMC. | |
1509 | * If this is not possible we'll try the full 2.7-3.6V of the spec. | |
1510 | * | |
1511 | * For 1.2V and 1.8V signaling we'll try to get as close as possible to the | |
1512 | * requested voltage. This is definitely a good idea for UHS where there's a | |
1513 | * separate regulator on the card that's trying to make 1.8V and it's best if | |
1514 | * we match. | |
1515 | * | |
1516 | * This function is expected to be used by a controller's | |
1517 | * start_signal_voltage_switch() function. | |
1518 | */ | |
1519 | int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios) | |
1520 | { | |
1521 | struct device *dev = mmc_dev(mmc); | |
1522 | int ret, volt, min_uV, max_uV; | |
1523 | ||
1524 | /* If no vqmmc supply then we can't change the voltage */ | |
1525 | if (IS_ERR(mmc->supply.vqmmc)) | |
1526 | return -EINVAL; | |
1527 | ||
1528 | switch (ios->signal_voltage) { | |
1529 | case MMC_SIGNAL_VOLTAGE_120: | |
1530 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1531 | 1100000, 1200000, 1300000); | |
1532 | case MMC_SIGNAL_VOLTAGE_180: | |
1533 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1534 | 1700000, 1800000, 1950000); | |
1535 | case MMC_SIGNAL_VOLTAGE_330: | |
1536 | ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV); | |
1537 | if (ret < 0) | |
1538 | return ret; | |
1539 | ||
1540 | dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n", | |
1541 | __func__, volt, max_uV); | |
1542 | ||
1543 | min_uV = max(volt - 300000, 2700000); | |
1544 | max_uV = min(max_uV + 200000, 3600000); | |
1545 | ||
1546 | /* | |
1547 | * Due to a limitation in the current implementation of | |
1548 | * regulator_set_voltage_triplet() which is taking the lowest | |
1549 | * voltage possible if below the target, search for a suitable | |
1550 | * voltage in two steps and try to stay close to vmmc | |
1551 | * with a 0.3V tolerance at first. | |
1552 | */ | |
1553 | if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1554 | min_uV, volt, max_uV)) | |
1555 | return 0; | |
1556 | ||
1557 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1558 | 2700000, volt, 3600000); | |
1559 | default: | |
1560 | return -EINVAL; | |
1561 | } | |
1562 | } | |
1563 | EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc); | |
1564 | ||
4d1f52f9 TK |
1565 | #endif /* CONFIG_REGULATOR */ |
1566 | ||
1f90e9a3 WS |
1567 | /** |
1568 | * mmc_regulator_get_supply - try to get VMMC and VQMMC regulators for a host | |
1569 | * @mmc: the host to regulate | |
1570 | * | |
1571 | * Returns 0 or errno. errno should be handled, it is either a critical error | |
1572 | * or -EPROBE_DEFER. 0 means no critical error but it does not mean all | |
1573 | * regulators have been found because they all are optional. If you require | |
1574 | * certain regulators, you need to check separately in your driver if they got | |
1575 | * populated after calling this function. | |
1576 | */ | |
e137788d GL |
1577 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1578 | { | |
1579 | struct device *dev = mmc_dev(mmc); | |
e137788d GL |
1580 | int ret; |
1581 | ||
4d1f52f9 | 1582 | mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc"); |
bc35d5ed | 1583 | mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc"); |
e137788d | 1584 | |
4d1f52f9 TK |
1585 | if (IS_ERR(mmc->supply.vmmc)) { |
1586 | if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER) | |
1587 | return -EPROBE_DEFER; | |
6e1bbc51 | 1588 | dev_dbg(dev, "No vmmc regulator found\n"); |
4d1f52f9 TK |
1589 | } else { |
1590 | ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc); | |
1591 | if (ret > 0) | |
1592 | mmc->ocr_avail = ret; | |
1593 | else | |
1594 | dev_warn(dev, "Failed getting OCR mask: %d\n", ret); | |
1595 | } | |
e137788d | 1596 | |
4d1f52f9 TK |
1597 | if (IS_ERR(mmc->supply.vqmmc)) { |
1598 | if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER) | |
1599 | return -EPROBE_DEFER; | |
6e1bbc51 | 1600 | dev_dbg(dev, "No vqmmc regulator found\n"); |
4d1f52f9 | 1601 | } |
e137788d GL |
1602 | |
1603 | return 0; | |
1604 | } | |
1605 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1606 | ||
1da177e4 LT |
1607 | /* |
1608 | * Mask off any voltages we don't support and select | |
1609 | * the lowest voltage | |
1610 | */ | |
7ea239d9 | 1611 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1612 | { |
1613 | int bit; | |
1614 | ||
726d6f23 UH |
1615 | /* |
1616 | * Sanity check the voltages that the card claims to | |
1617 | * support. | |
1618 | */ | |
1619 | if (ocr & 0x7F) { | |
1620 | dev_warn(mmc_dev(host), | |
1621 | "card claims to support voltages below defined range\n"); | |
1622 | ocr &= ~0x7F; | |
1623 | } | |
1624 | ||
1da177e4 | 1625 | ocr &= host->ocr_avail; |
ce69d37b UH |
1626 | if (!ocr) { |
1627 | dev_warn(mmc_dev(host), "no support for card's volts\n"); | |
1628 | return 0; | |
1629 | } | |
1da177e4 | 1630 | |
ce69d37b UH |
1631 | if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) { |
1632 | bit = ffs(ocr) - 1; | |
63ef731a | 1633 | ocr &= 3 << bit; |
ce69d37b | 1634 | mmc_power_cycle(host, ocr); |
1da177e4 | 1635 | } else { |
ce69d37b UH |
1636 | bit = fls(ocr) - 1; |
1637 | ocr &= 3 << bit; | |
1638 | if (bit != host->ios.vdd) | |
1639 | dev_warn(mmc_dev(host), "exceeding card's volts\n"); | |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | return ocr; | |
1643 | } | |
1644 | ||
4e74b6b3 | 1645 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) |
567c8903 JR |
1646 | { |
1647 | int err = 0; | |
1648 | int old_signal_voltage = host->ios.signal_voltage; | |
1649 | ||
1650 | host->ios.signal_voltage = signal_voltage; | |
9eadcc05 | 1651 | if (host->ops->start_signal_voltage_switch) |
567c8903 | 1652 | err = host->ops->start_signal_voltage_switch(host, &host->ios); |
567c8903 JR |
1653 | |
1654 | if (err) | |
1655 | host->ios.signal_voltage = old_signal_voltage; | |
1656 | ||
1657 | return err; | |
1658 | ||
1659 | } | |
1660 | ||
3f496afb AH |
1661 | int mmc_host_set_uhs_voltage(struct mmc_host *host) |
1662 | { | |
1663 | u32 clock; | |
1664 | ||
1665 | /* | |
1666 | * During a signal voltage level switch, the clock must be gated | |
1667 | * for 5 ms according to the SD spec | |
1668 | */ | |
1669 | clock = host->ios.clock; | |
1670 | host->ios.clock = 0; | |
1671 | mmc_set_ios(host); | |
1672 | ||
1673 | if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180)) | |
1674 | return -EAGAIN; | |
1675 | ||
1676 | /* Keep clock gated for at least 10 ms, though spec only says 5 ms */ | |
1677 | mmc_delay(10); | |
1678 | host->ios.clock = clock; | |
1679 | mmc_set_ios(host); | |
1680 | ||
1681 | return 0; | |
1682 | } | |
1683 | ||
2ed573b6 | 1684 | int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr) |
f2119df6 | 1685 | { |
c7836d15 | 1686 | struct mmc_command cmd = {}; |
f2119df6 AN |
1687 | int err = 0; |
1688 | ||
0797e5f1 JR |
1689 | /* |
1690 | * If we cannot switch voltages, return failure so the caller | |
1691 | * can continue without UHS mode | |
1692 | */ | |
1693 | if (!host->ops->start_signal_voltage_switch) | |
1694 | return -EPERM; | |
1695 | if (!host->ops->card_busy) | |
6606110d JP |
1696 | pr_warn("%s: cannot verify signal voltage switch\n", |
1697 | mmc_hostname(host)); | |
0797e5f1 JR |
1698 | |
1699 | cmd.opcode = SD_SWITCH_VOLTAGE; | |
1700 | cmd.arg = 0; | |
1701 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1702 | ||
1703 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1704 | if (err) | |
9eadcc05 UH |
1705 | return err; |
1706 | ||
1707 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1708 | return -EIO; | |
0797e5f1 | 1709 | |
0797e5f1 JR |
1710 | /* |
1711 | * The card should drive cmd and dat[0:3] low immediately | |
1712 | * after the response of cmd11, but wait 1 ms to be sure | |
1713 | */ | |
1714 | mmc_delay(1); | |
1715 | if (host->ops->card_busy && !host->ops->card_busy(host)) { | |
1716 | err = -EAGAIN; | |
1717 | goto power_cycle; | |
1718 | } | |
f2119df6 | 1719 | |
3f496afb | 1720 | if (mmc_host_set_uhs_voltage(host)) { |
0797e5f1 JR |
1721 | /* |
1722 | * Voltages may not have been switched, but we've already | |
1723 | * sent CMD11, so a power cycle is required anyway | |
1724 | */ | |
1725 | err = -EAGAIN; | |
1726 | goto power_cycle; | |
f2119df6 AN |
1727 | } |
1728 | ||
0797e5f1 JR |
1729 | /* Wait for at least 1 ms according to spec */ |
1730 | mmc_delay(1); | |
1731 | ||
1732 | /* | |
1733 | * Failure to switch is indicated by the card holding | |
1734 | * dat[0:3] low | |
1735 | */ | |
1736 | if (host->ops->card_busy && host->ops->card_busy(host)) | |
1737 | err = -EAGAIN; | |
1738 | ||
1739 | power_cycle: | |
1740 | if (err) { | |
1741 | pr_debug("%s: Signal voltage switch failed, " | |
1742 | "power cycling card\n", mmc_hostname(host)); | |
0f791fda | 1743 | mmc_power_cycle(host, ocr); |
0797e5f1 JR |
1744 | } |
1745 | ||
0797e5f1 | 1746 | return err; |
f2119df6 AN |
1747 | } |
1748 | ||
b57c43ad | 1749 | /* |
7ea239d9 | 1750 | * Select timing parameters for host. |
b57c43ad | 1751 | */ |
7ea239d9 | 1752 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1753 | { |
7ea239d9 PO |
1754 | host->ios.timing = timing; |
1755 | mmc_set_ios(host); | |
b57c43ad PO |
1756 | } |
1757 | ||
d6d50a15 AN |
1758 | /* |
1759 | * Select appropriate driver type for host. | |
1760 | */ | |
1761 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1762 | { | |
1763 | host->ios.drv_type = drv_type; | |
1764 | mmc_set_ios(host); | |
1765 | } | |
1766 | ||
e23350b3 AH |
1767 | int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr, |
1768 | int card_drv_type, int *drv_type) | |
1769 | { | |
1770 | struct mmc_host *host = card->host; | |
1771 | int host_drv_type = SD_DRIVER_TYPE_B; | |
e23350b3 AH |
1772 | |
1773 | *drv_type = 0; | |
1774 | ||
1775 | if (!host->ops->select_drive_strength) | |
1776 | return 0; | |
1777 | ||
1778 | /* Use SD definition of driver strength for hosts */ | |
1779 | if (host->caps & MMC_CAP_DRIVER_TYPE_A) | |
1780 | host_drv_type |= SD_DRIVER_TYPE_A; | |
1781 | ||
1782 | if (host->caps & MMC_CAP_DRIVER_TYPE_C) | |
1783 | host_drv_type |= SD_DRIVER_TYPE_C; | |
1784 | ||
1785 | if (host->caps & MMC_CAP_DRIVER_TYPE_D) | |
1786 | host_drv_type |= SD_DRIVER_TYPE_D; | |
1787 | ||
1788 | /* | |
1789 | * The drive strength that the hardware can support | |
1790 | * depends on the board design. Pass the appropriate | |
1791 | * information and let the hardware specific code | |
1792 | * return what is possible given the options | |
1793 | */ | |
9eadcc05 UH |
1794 | return host->ops->select_drive_strength(card, max_dtr, |
1795 | host_drv_type, | |
1796 | card_drv_type, | |
1797 | drv_type); | |
e23350b3 AH |
1798 | } |
1799 | ||
1da177e4 | 1800 | /* |
45f8245b RK |
1801 | * Apply power to the MMC stack. This is a two-stage process. |
1802 | * First, we enable power to the card without the clock running. | |
1803 | * We then wait a bit for the power to stabilise. Finally, | |
1804 | * enable the bus drivers and clock to the card. | |
1805 | * | |
1806 | * We must _NOT_ enable the clock prior to power stablising. | |
1807 | * | |
1808 | * If a host does all the power sequencing itself, ignore the | |
1809 | * initial MMC_POWER_UP stage. | |
1da177e4 | 1810 | */ |
4a065193 | 1811 | void mmc_power_up(struct mmc_host *host, u32 ocr) |
1da177e4 | 1812 | { |
fa550189 UH |
1813 | if (host->ios.power_mode == MMC_POWER_ON) |
1814 | return; | |
1815 | ||
3aa8793f UH |
1816 | mmc_pwrseq_pre_power_on(host); |
1817 | ||
4a065193 | 1818 | host->ios.vdd = fls(ocr) - 1; |
1da177e4 | 1819 | host->ios.power_mode = MMC_POWER_UP; |
2d079c43 JR |
1820 | /* Set initial state and call mmc_set_ios */ |
1821 | mmc_set_initial_state(host); | |
1da177e4 | 1822 | |
ceae98f2 | 1823 | /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */ |
4e74b6b3 | 1824 | if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330)) |
ceae98f2 | 1825 | dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n"); |
4e74b6b3 | 1826 | else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180)) |
ceae98f2 | 1827 | dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n"); |
4e74b6b3 | 1828 | else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120)) |
ceae98f2 | 1829 | dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n"); |
108ecc4c | 1830 | |
f9996aee PO |
1831 | /* |
1832 | * This delay should be sufficient to allow the power supply | |
1833 | * to reach the minimum voltage. | |
1834 | */ | |
79bccc5a | 1835 | mmc_delay(10); |
1da177e4 | 1836 | |
4febb7e2 UH |
1837 | mmc_pwrseq_post_power_on(host); |
1838 | ||
88ae8b86 | 1839 | host->ios.clock = host->f_init; |
8dfd0374 | 1840 | |
1da177e4 | 1841 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1842 | mmc_set_ios(host); |
1da177e4 | 1843 | |
f9996aee PO |
1844 | /* |
1845 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1846 | * time required to reach a stable voltage. | |
1847 | */ | |
79bccc5a | 1848 | mmc_delay(10); |
1da177e4 LT |
1849 | } |
1850 | ||
7f7e4129 | 1851 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1852 | { |
fa550189 UH |
1853 | if (host->ios.power_mode == MMC_POWER_OFF) |
1854 | return; | |
1855 | ||
3aa8793f UH |
1856 | mmc_pwrseq_power_off(host); |
1857 | ||
1da177e4 LT |
1858 | host->ios.clock = 0; |
1859 | host->ios.vdd = 0; | |
b33d46c3 | 1860 | |
1da177e4 | 1861 | host->ios.power_mode = MMC_POWER_OFF; |
2d079c43 JR |
1862 | /* Set initial state and call mmc_set_ios */ |
1863 | mmc_set_initial_state(host); | |
778e277c | 1864 | |
041beb1d DD |
1865 | /* |
1866 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1867 | * XO-1.5, require a short delay after poweroff before the card | |
1868 | * can be successfully turned on again. | |
1869 | */ | |
1870 | mmc_delay(1); | |
1da177e4 LT |
1871 | } |
1872 | ||
4a065193 | 1873 | void mmc_power_cycle(struct mmc_host *host, u32 ocr) |
276e090f JR |
1874 | { |
1875 | mmc_power_off(host); | |
1876 | /* Wait at least 1 ms according to SD spec */ | |
1877 | mmc_delay(1); | |
4a065193 | 1878 | mmc_power_up(host, ocr); |
276e090f JR |
1879 | } |
1880 | ||
39361851 AB |
1881 | /* |
1882 | * Cleanup when the last reference to the bus operator is dropped. | |
1883 | */ | |
261172fd | 1884 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 | 1885 | { |
6ff897ff | 1886 | WARN_ON(!host->bus_dead); |
39361851 AB |
1887 | |
1888 | host->bus_ops = NULL; | |
1889 | } | |
1890 | ||
1891 | /* | |
1892 | * Increase reference count of bus operator | |
1893 | */ | |
1894 | static inline void mmc_bus_get(struct mmc_host *host) | |
1895 | { | |
1896 | unsigned long flags; | |
1897 | ||
1898 | spin_lock_irqsave(&host->lock, flags); | |
1899 | host->bus_refs++; | |
1900 | spin_unlock_irqrestore(&host->lock, flags); | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Decrease reference count of bus operator and free it if | |
1905 | * it is the last reference. | |
1906 | */ | |
1907 | static inline void mmc_bus_put(struct mmc_host *host) | |
1908 | { | |
1909 | unsigned long flags; | |
1910 | ||
1911 | spin_lock_irqsave(&host->lock, flags); | |
1912 | host->bus_refs--; | |
1913 | if ((host->bus_refs == 0) && host->bus_ops) | |
1914 | __mmc_release_bus(host); | |
1915 | spin_unlock_irqrestore(&host->lock, flags); | |
1916 | } | |
1917 | ||
1da177e4 | 1918 | /* |
7ea239d9 PO |
1919 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1920 | * host at any given time. | |
1da177e4 | 1921 | */ |
7ea239d9 | 1922 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1923 | { |
7ea239d9 | 1924 | unsigned long flags; |
e45a1bd2 | 1925 | |
d84075c8 | 1926 | WARN_ON(!host->claimed); |
bce40a36 | 1927 | |
7ea239d9 | 1928 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1929 | |
6ff897ff SL |
1930 | WARN_ON(host->bus_ops); |
1931 | WARN_ON(host->bus_refs); | |
b57c43ad | 1932 | |
7ea239d9 PO |
1933 | host->bus_ops = ops; |
1934 | host->bus_refs = 1; | |
1935 | host->bus_dead = 0; | |
b57c43ad | 1936 | |
7ea239d9 | 1937 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1938 | } |
1939 | ||
7ea239d9 | 1940 | /* |
7f7e4129 | 1941 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1942 | */ |
1943 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1944 | { |
7ea239d9 | 1945 | unsigned long flags; |
7ccd266e | 1946 | |
d84075c8 PO |
1947 | WARN_ON(!host->claimed); |
1948 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1949 | |
7ea239d9 | 1950 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1951 | |
7ea239d9 | 1952 | host->bus_dead = 1; |
7ccd266e | 1953 | |
7ea239d9 | 1954 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1955 | |
7ea239d9 | 1956 | mmc_bus_put(host); |
1da177e4 LT |
1957 | } |
1958 | ||
bbd43682 UH |
1959 | static void _mmc_detect_change(struct mmc_host *host, unsigned long delay, |
1960 | bool cd_irq) | |
1961 | { | |
bbd43682 UH |
1962 | /* |
1963 | * If the device is configured as wakeup, we prevent a new sleep for | |
1964 | * 5 s to give provision for user space to consume the event. | |
1965 | */ | |
1966 | if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) && | |
1967 | device_can_wakeup(mmc_dev(host))) | |
1968 | pm_wakeup_event(mmc_dev(host), 5000); | |
1969 | ||
1970 | host->detect_change = 1; | |
1971 | mmc_schedule_delayed_work(&host->detect, delay); | |
1972 | } | |
1973 | ||
1da177e4 LT |
1974 | /** |
1975 | * mmc_detect_change - process change of state on a MMC socket | |
1976 | * @host: host which changed state. | |
8dc00335 | 1977 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1978 | * |
67a61c48 PO |
1979 | * MMC drivers should call this when they detect a card has been |
1980 | * inserted or removed. The MMC layer will confirm that any | |
1981 | * present card is still functional, and initialize any newly | |
1982 | * inserted. | |
1da177e4 | 1983 | */ |
8dc00335 | 1984 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1985 | { |
bbd43682 | 1986 | _mmc_detect_change(host, delay, true); |
1da177e4 | 1987 | } |
1da177e4 LT |
1988 | EXPORT_SYMBOL(mmc_detect_change); |
1989 | ||
dfe86cba AH |
1990 | void mmc_init_erase(struct mmc_card *card) |
1991 | { | |
1992 | unsigned int sz; | |
1993 | ||
1994 | if (is_power_of_2(card->erase_size)) | |
1995 | card->erase_shift = ffs(card->erase_size) - 1; | |
1996 | else | |
1997 | card->erase_shift = 0; | |
1998 | ||
1999 | /* | |
2000 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
2001 | * card. That is not desirable because it can take a long time | |
2002 | * (minutes) potentially delaying more important I/O, and also the | |
2003 | * timeout calculations become increasingly hugely over-estimated. | |
2004 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
2005 | * to that size and alignment. | |
2006 | * | |
2007 | * For SD cards that define Allocation Unit size, limit erases to one | |
c6d8fd61 GG |
2008 | * Allocation Unit at a time. |
2009 | * For MMC, have a stab at ai good value and for modern cards it will | |
2010 | * end up being 4MiB. Note that if the value is too small, it can end | |
2011 | * up taking longer to erase. Also note, erase_size is already set to | |
2012 | * High Capacity Erase Size if available when this function is called. | |
dfe86cba AH |
2013 | */ |
2014 | if (mmc_card_sd(card) && card->ssr.au) { | |
2015 | card->pref_erase = card->ssr.au; | |
2016 | card->erase_shift = ffs(card->ssr.au) - 1; | |
cc8aa7de | 2017 | } else if (card->erase_size) { |
dfe86cba AH |
2018 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; |
2019 | if (sz < 128) | |
2020 | card->pref_erase = 512 * 1024 / 512; | |
2021 | else if (sz < 512) | |
2022 | card->pref_erase = 1024 * 1024 / 512; | |
2023 | else if (sz < 1024) | |
2024 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
2025 | else | |
2026 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
2027 | if (card->pref_erase < card->erase_size) | |
2028 | card->pref_erase = card->erase_size; | |
2029 | else { | |
2030 | sz = card->pref_erase % card->erase_size; | |
2031 | if (sz) | |
2032 | card->pref_erase += card->erase_size - sz; | |
2033 | } | |
cc8aa7de CD |
2034 | } else |
2035 | card->pref_erase = 0; | |
dfe86cba AH |
2036 | } |
2037 | ||
eaa02f75 AW |
2038 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
2039 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
2040 | { |
2041 | unsigned int erase_timeout; | |
2042 | ||
7194efb8 AH |
2043 | if (arg == MMC_DISCARD_ARG || |
2044 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
2045 | erase_timeout = card->ext_csd.trim_timeout; | |
2046 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
2047 | /* High Capacity Erase Group Size uses HC timeouts */ |
2048 | if (arg == MMC_TRIM_ARG) | |
2049 | erase_timeout = card->ext_csd.trim_timeout; | |
2050 | else | |
2051 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
2052 | } else { | |
2053 | /* CSD Erase Group Size uses write timeout */ | |
2054 | unsigned int mult = (10 << card->csd.r2w_factor); | |
4406ae21 | 2055 | unsigned int timeout_clks = card->csd.taac_clks * mult; |
dfe86cba AH |
2056 | unsigned int timeout_us; |
2057 | ||
4406ae21 SL |
2058 | /* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */ |
2059 | if (card->csd.taac_ns < 1000000) | |
2060 | timeout_us = (card->csd.taac_ns * mult) / 1000; | |
dfe86cba | 2061 | else |
4406ae21 | 2062 | timeout_us = (card->csd.taac_ns / 1000) * mult; |
dfe86cba AH |
2063 | |
2064 | /* | |
2065 | * ios.clock is only a target. The real clock rate might be | |
2066 | * less but not that much less, so fudge it by multiplying by 2. | |
2067 | */ | |
2068 | timeout_clks <<= 1; | |
2069 | timeout_us += (timeout_clks * 1000) / | |
9eadcc05 | 2070 | (card->host->ios.clock / 1000); |
dfe86cba AH |
2071 | |
2072 | erase_timeout = timeout_us / 1000; | |
2073 | ||
2074 | /* | |
2075 | * Theoretically, the calculation could underflow so round up | |
2076 | * to 1ms in that case. | |
2077 | */ | |
2078 | if (!erase_timeout) | |
2079 | erase_timeout = 1; | |
2080 | } | |
2081 | ||
2082 | /* Multiplier for secure operations */ | |
2083 | if (arg & MMC_SECURE_ARGS) { | |
2084 | if (arg == MMC_SECURE_ERASE_ARG) | |
2085 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
2086 | else | |
2087 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
2088 | } | |
2089 | ||
2090 | erase_timeout *= qty; | |
2091 | ||
2092 | /* | |
2093 | * Ensure at least a 1 second timeout for SPI as per | |
2094 | * 'mmc_set_data_timeout()' | |
2095 | */ | |
2096 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
2097 | erase_timeout = 1000; | |
2098 | ||
eaa02f75 | 2099 | return erase_timeout; |
dfe86cba AH |
2100 | } |
2101 | ||
eaa02f75 AW |
2102 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
2103 | unsigned int arg, | |
2104 | unsigned int qty) | |
dfe86cba | 2105 | { |
eaa02f75 AW |
2106 | unsigned int erase_timeout; |
2107 | ||
dfe86cba AH |
2108 | if (card->ssr.erase_timeout) { |
2109 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
2110 | erase_timeout = card->ssr.erase_timeout * qty + |
2111 | card->ssr.erase_offset; | |
dfe86cba AH |
2112 | } else { |
2113 | /* | |
2114 | * Erase timeout not specified in SD Status Register (SSR) so | |
2115 | * use 250ms per write block. | |
2116 | */ | |
eaa02f75 | 2117 | erase_timeout = 250 * qty; |
dfe86cba AH |
2118 | } |
2119 | ||
2120 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
2121 | if (erase_timeout < 1000) |
2122 | erase_timeout = 1000; | |
2123 | ||
2124 | return erase_timeout; | |
dfe86cba AH |
2125 | } |
2126 | ||
eaa02f75 AW |
2127 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
2128 | unsigned int arg, | |
2129 | unsigned int qty) | |
dfe86cba AH |
2130 | { |
2131 | if (mmc_card_sd(card)) | |
eaa02f75 | 2132 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 2133 | else |
eaa02f75 | 2134 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
2135 | } |
2136 | ||
2137 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
2138 | unsigned int to, unsigned int arg) | |
2139 | { | |
c7836d15 | 2140 | struct mmc_command cmd = {}; |
bb4eecf2 BW |
2141 | unsigned int qty = 0, busy_timeout = 0; |
2142 | bool use_r1b_resp = false; | |
8fee476b | 2143 | unsigned long timeout; |
dfe86cba AH |
2144 | int err; |
2145 | ||
8f11d106 AH |
2146 | mmc_retune_hold(card->host); |
2147 | ||
dfe86cba AH |
2148 | /* |
2149 | * qty is used to calculate the erase timeout which depends on how many | |
2150 | * erase groups (or allocation units in SD terminology) are affected. | |
2151 | * We count erasing part of an erase group as one erase group. | |
2152 | * For SD, the allocation units are always a power of 2. For MMC, the | |
2153 | * erase group size is almost certainly also power of 2, but it does not | |
2154 | * seem to insist on that in the JEDEC standard, so we fall back to | |
2155 | * division in that case. SD may not specify an allocation unit size, | |
2156 | * in which case the timeout is based on the number of write blocks. | |
2157 | * | |
2158 | * Note that the timeout for secure trim 2 will only be correct if the | |
2159 | * number of erase groups specified is the same as the total of all | |
2160 | * preceding secure trim 1 commands. Since the power may have been | |
2161 | * lost since the secure trim 1 commands occurred, it is generally | |
2162 | * impossible to calculate the secure trim 2 timeout correctly. | |
2163 | */ | |
2164 | if (card->erase_shift) | |
2165 | qty += ((to >> card->erase_shift) - | |
2166 | (from >> card->erase_shift)) + 1; | |
2167 | else if (mmc_card_sd(card)) | |
2168 | qty += to - from + 1; | |
2169 | else | |
2170 | qty += ((to / card->erase_size) - | |
2171 | (from / card->erase_size)) + 1; | |
2172 | ||
2173 | if (!mmc_card_blockaddr(card)) { | |
2174 | from <<= 9; | |
2175 | to <<= 9; | |
2176 | } | |
2177 | ||
dfe86cba AH |
2178 | if (mmc_card_sd(card)) |
2179 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
2180 | else | |
2181 | cmd.opcode = MMC_ERASE_GROUP_START; | |
2182 | cmd.arg = from; | |
2183 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2184 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2185 | if (err) { | |
a3c76eb9 | 2186 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 2187 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 2188 | err = -EIO; |
dfe86cba AH |
2189 | goto out; |
2190 | } | |
2191 | ||
2192 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2193 | if (mmc_card_sd(card)) | |
2194 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
2195 | else | |
2196 | cmd.opcode = MMC_ERASE_GROUP_END; | |
2197 | cmd.arg = to; | |
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 end error %d, status %#x\n", |
dfe86cba | 2202 | err, cmd.resp[0]); |
67716327 | 2203 | err = -EIO; |
dfe86cba AH |
2204 | goto out; |
2205 | } | |
2206 | ||
2207 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2208 | cmd.opcode = MMC_ERASE; | |
2209 | cmd.arg = arg; | |
bb4eecf2 BW |
2210 | busy_timeout = mmc_erase_timeout(card, arg, qty); |
2211 | /* | |
2212 | * If the host controller supports busy signalling and the timeout for | |
2213 | * the erase operation does not exceed the max_busy_timeout, we should | |
2214 | * use R1B response. Or we need to prevent the host from doing hw busy | |
2215 | * detection, which is done by converting to a R1 response instead. | |
2216 | */ | |
2217 | if (card->host->max_busy_timeout && | |
2218 | busy_timeout > card->host->max_busy_timeout) { | |
2219 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2220 | } else { | |
2221 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
2222 | cmd.busy_timeout = busy_timeout; | |
2223 | use_r1b_resp = true; | |
2224 | } | |
2225 | ||
dfe86cba AH |
2226 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
2227 | if (err) { | |
a3c76eb9 | 2228 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
2229 | err, cmd.resp[0]); |
2230 | err = -EIO; | |
2231 | goto out; | |
2232 | } | |
2233 | ||
2234 | if (mmc_host_is_spi(card->host)) | |
2235 | goto out; | |
2236 | ||
bb4eecf2 BW |
2237 | /* |
2238 | * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling | |
2239 | * shall be avoided. | |
2240 | */ | |
2241 | if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) | |
2242 | goto out; | |
2243 | ||
2244 | timeout = jiffies + msecs_to_jiffies(busy_timeout); | |
dfe86cba AH |
2245 | do { |
2246 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2247 | cmd.opcode = MMC_SEND_STATUS; | |
2248 | cmd.arg = card->rca << 16; | |
2249 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
2250 | /* Do not retry else we can't see errors */ | |
2251 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2252 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 2253 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
2254 | err, cmd.resp[0]); |
2255 | err = -EIO; | |
2256 | goto out; | |
2257 | } | |
8fee476b TR |
2258 | |
2259 | /* Timeout if the device never becomes ready for data and | |
2260 | * never leaves the program state. | |
2261 | */ | |
2262 | if (time_after(jiffies, timeout)) { | |
2263 | pr_err("%s: Card stuck in programming state! %s\n", | |
2264 | mmc_hostname(card->host), __func__); | |
2265 | err = -EIO; | |
2266 | goto out; | |
2267 | } | |
2268 | ||
dfe86cba | 2269 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || |
8fee476b | 2270 | (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)); |
dfe86cba | 2271 | out: |
8f11d106 | 2272 | mmc_retune_release(card->host); |
dfe86cba AH |
2273 | return err; |
2274 | } | |
2275 | ||
71085123 BW |
2276 | static unsigned int mmc_align_erase_size(struct mmc_card *card, |
2277 | unsigned int *from, | |
2278 | unsigned int *to, | |
2279 | unsigned int nr) | |
2280 | { | |
2281 | unsigned int from_new = *from, nr_new = nr, rem; | |
2282 | ||
6c689886 BW |
2283 | /* |
2284 | * When the 'card->erase_size' is power of 2, we can use round_up/down() | |
2285 | * to align the erase size efficiently. | |
2286 | */ | |
2287 | if (is_power_of_2(card->erase_size)) { | |
2288 | unsigned int temp = from_new; | |
2289 | ||
2290 | from_new = round_up(temp, card->erase_size); | |
2291 | rem = from_new - temp; | |
2292 | ||
71085123 BW |
2293 | if (nr_new > rem) |
2294 | nr_new -= rem; | |
2295 | else | |
2296 | return 0; | |
71085123 | 2297 | |
6c689886 BW |
2298 | nr_new = round_down(nr_new, card->erase_size); |
2299 | } else { | |
2300 | rem = from_new % card->erase_size; | |
2301 | if (rem) { | |
2302 | rem = card->erase_size - rem; | |
2303 | from_new += rem; | |
2304 | if (nr_new > rem) | |
2305 | nr_new -= rem; | |
2306 | else | |
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | rem = nr_new % card->erase_size; | |
2311 | if (rem) | |
2312 | nr_new -= rem; | |
2313 | } | |
71085123 BW |
2314 | |
2315 | if (nr_new == 0) | |
2316 | return 0; | |
2317 | ||
2318 | *to = from_new + nr_new; | |
2319 | *from = from_new; | |
2320 | ||
2321 | return nr_new; | |
2322 | } | |
2323 | ||
dfe86cba AH |
2324 | /** |
2325 | * mmc_erase - erase sectors. | |
2326 | * @card: card to erase | |
2327 | * @from: first sector to erase | |
2328 | * @nr: number of sectors to erase | |
2329 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
2330 | * | |
2331 | * Caller must claim host before calling this function. | |
2332 | */ | |
2333 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
2334 | unsigned int arg) | |
2335 | { | |
2336 | unsigned int rem, to = from + nr; | |
642c28ab | 2337 | int err; |
dfe86cba AH |
2338 | |
2339 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
2340 | !(card->csd.cmdclass & CCC_ERASE)) | |
2341 | return -EOPNOTSUPP; | |
2342 | ||
2343 | if (!card->erase_size) | |
2344 | return -EOPNOTSUPP; | |
2345 | ||
2346 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
2347 | return -EOPNOTSUPP; | |
2348 | ||
2349 | if ((arg & MMC_SECURE_ARGS) && | |
2350 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
2351 | return -EOPNOTSUPP; | |
2352 | ||
2353 | if ((arg & MMC_TRIM_ARGS) && | |
2354 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
2355 | return -EOPNOTSUPP; | |
2356 | ||
2357 | if (arg == MMC_SECURE_ERASE_ARG) { | |
2358 | if (from % card->erase_size || nr % card->erase_size) | |
2359 | return -EINVAL; | |
2360 | } | |
2361 | ||
71085123 BW |
2362 | if (arg == MMC_ERASE_ARG) |
2363 | nr = mmc_align_erase_size(card, &from, &to, nr); | |
dfe86cba AH |
2364 | |
2365 | if (nr == 0) | |
2366 | return 0; | |
2367 | ||
dfe86cba AH |
2368 | if (to <= from) |
2369 | return -EINVAL; | |
2370 | ||
2371 | /* 'from' and 'to' are inclusive */ | |
2372 | to -= 1; | |
2373 | ||
642c28ab DJ |
2374 | /* |
2375 | * Special case where only one erase-group fits in the timeout budget: | |
2376 | * If the region crosses an erase-group boundary on this particular | |
2377 | * case, we will be trimming more than one erase-group which, does not | |
2378 | * fit in the timeout budget of the controller, so we need to split it | |
2379 | * and call mmc_do_erase() twice if necessary. This special case is | |
2380 | * identified by the card->eg_boundary flag. | |
2381 | */ | |
22d7e85f RG |
2382 | rem = card->erase_size - (from % card->erase_size); |
2383 | if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) { | |
642c28ab DJ |
2384 | err = mmc_do_erase(card, from, from + rem - 1, arg); |
2385 | from += rem; | |
2386 | if ((err) || (to <= from)) | |
2387 | return err; | |
2388 | } | |
2389 | ||
dfe86cba AH |
2390 | return mmc_do_erase(card, from, to, arg); |
2391 | } | |
2392 | EXPORT_SYMBOL(mmc_erase); | |
2393 | ||
2394 | int mmc_can_erase(struct mmc_card *card) | |
2395 | { | |
2396 | if ((card->host->caps & MMC_CAP_ERASE) && | |
2397 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
2398 | return 1; | |
2399 | return 0; | |
2400 | } | |
2401 | EXPORT_SYMBOL(mmc_can_erase); | |
2402 | ||
2403 | int mmc_can_trim(struct mmc_card *card) | |
2404 | { | |
b5b4ff0a SL |
2405 | if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) && |
2406 | (!(card->quirks & MMC_QUIRK_TRIM_BROKEN))) | |
dfe86cba AH |
2407 | return 1; |
2408 | return 0; | |
2409 | } | |
2410 | EXPORT_SYMBOL(mmc_can_trim); | |
2411 | ||
b3bf9153 KP |
2412 | int mmc_can_discard(struct mmc_card *card) |
2413 | { | |
2414 | /* | |
2415 | * As there's no way to detect the discard support bit at v4.5 | |
2416 | * use the s/w feature support filed. | |
2417 | */ | |
2418 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
2419 | return 1; | |
2420 | return 0; | |
2421 | } | |
2422 | EXPORT_SYMBOL(mmc_can_discard); | |
2423 | ||
d9ddd629 KP |
2424 | int mmc_can_sanitize(struct mmc_card *card) |
2425 | { | |
28302812 AH |
2426 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
2427 | return 0; | |
d9ddd629 KP |
2428 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
2429 | return 1; | |
2430 | return 0; | |
2431 | } | |
2432 | EXPORT_SYMBOL(mmc_can_sanitize); | |
2433 | ||
dfe86cba AH |
2434 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
2435 | { | |
5204d00f LC |
2436 | if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) && |
2437 | !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN)) | |
dfe86cba AH |
2438 | return 1; |
2439 | return 0; | |
2440 | } | |
2441 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
2442 | ||
2443 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
2444 | unsigned int nr) | |
2445 | { | |
2446 | if (!card->erase_size) | |
2447 | return 0; | |
2448 | if (from % card->erase_size || nr % card->erase_size) | |
2449 | return 0; | |
2450 | return 1; | |
2451 | } | |
2452 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 2453 | |
e056a1b5 AH |
2454 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
2455 | unsigned int arg) | |
2456 | { | |
2457 | struct mmc_host *host = card->host; | |
bb4eecf2 | 2458 | unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout; |
e056a1b5 | 2459 | unsigned int last_timeout = 0; |
12182aff UH |
2460 | unsigned int max_busy_timeout = host->max_busy_timeout ? |
2461 | host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS; | |
e056a1b5 | 2462 | |
bb4eecf2 | 2463 | if (card->erase_shift) { |
e056a1b5 | 2464 | max_qty = UINT_MAX >> card->erase_shift; |
bb4eecf2 BW |
2465 | min_qty = card->pref_erase >> card->erase_shift; |
2466 | } else if (mmc_card_sd(card)) { | |
e056a1b5 | 2467 | max_qty = UINT_MAX; |
bb4eecf2 BW |
2468 | min_qty = card->pref_erase; |
2469 | } else { | |
e056a1b5 | 2470 | max_qty = UINT_MAX / card->erase_size; |
bb4eecf2 BW |
2471 | min_qty = card->pref_erase / card->erase_size; |
2472 | } | |
e056a1b5 | 2473 | |
bb4eecf2 BW |
2474 | /* |
2475 | * We should not only use 'host->max_busy_timeout' as the limitation | |
2476 | * when deciding the max discard sectors. We should set a balance value | |
2477 | * to improve the erase speed, and it can not get too long timeout at | |
2478 | * the same time. | |
2479 | * | |
2480 | * Here we set 'card->pref_erase' as the minimal discard sectors no | |
2481 | * matter what size of 'host->max_busy_timeout', but if the | |
2482 | * 'host->max_busy_timeout' is large enough for more discard sectors, | |
2483 | * then we can continue to increase the max discard sectors until we | |
12182aff UH |
2484 | * get a balance value. In cases when the 'host->max_busy_timeout' |
2485 | * isn't specified, use the default max erase timeout. | |
bb4eecf2 | 2486 | */ |
e056a1b5 AH |
2487 | do { |
2488 | y = 0; | |
2489 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
2490 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
bb4eecf2 | 2491 | |
12182aff | 2492 | if (qty + x > min_qty && timeout > max_busy_timeout) |
e056a1b5 | 2493 | break; |
bb4eecf2 | 2494 | |
e056a1b5 AH |
2495 | if (timeout < last_timeout) |
2496 | break; | |
2497 | last_timeout = timeout; | |
2498 | y = x; | |
2499 | } | |
2500 | qty += y; | |
2501 | } while (y); | |
2502 | ||
2503 | if (!qty) | |
2504 | return 0; | |
2505 | ||
642c28ab DJ |
2506 | /* |
2507 | * When specifying a sector range to trim, chances are we might cross | |
2508 | * an erase-group boundary even if the amount of sectors is less than | |
2509 | * one erase-group. | |
2510 | * If we can only fit one erase-group in the controller timeout budget, | |
2511 | * we have to care that erase-group boundaries are not crossed by a | |
2512 | * single trim operation. We flag that special case with "eg_boundary". | |
2513 | * In all other cases we can just decrement qty and pretend that we | |
2514 | * always touch (qty + 1) erase-groups as a simple optimization. | |
2515 | */ | |
e056a1b5 | 2516 | if (qty == 1) |
642c28ab DJ |
2517 | card->eg_boundary = 1; |
2518 | else | |
2519 | qty--; | |
e056a1b5 AH |
2520 | |
2521 | /* Convert qty to sectors */ | |
2522 | if (card->erase_shift) | |
642c28ab | 2523 | max_discard = qty << card->erase_shift; |
e056a1b5 | 2524 | else if (mmc_card_sd(card)) |
642c28ab | 2525 | max_discard = qty + 1; |
e056a1b5 | 2526 | else |
642c28ab | 2527 | max_discard = qty * card->erase_size; |
e056a1b5 AH |
2528 | |
2529 | return max_discard; | |
2530 | } | |
2531 | ||
2532 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
2533 | { | |
2534 | struct mmc_host *host = card->host; | |
2535 | unsigned int max_discard, max_trim; | |
2536 | ||
e056a1b5 AH |
2537 | /* |
2538 | * Without erase_group_def set, MMC erase timeout depends on clock | |
2539 | * frequence which can change. In that case, the best choice is | |
2540 | * just the preferred erase size. | |
2541 | */ | |
2542 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
2543 | return card->pref_erase; | |
2544 | ||
2545 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
2546 | if (mmc_can_trim(card)) { | |
2547 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
2548 | if (max_trim < max_discard) | |
2549 | max_discard = max_trim; | |
2550 | } else if (max_discard < card->erase_size) { | |
2551 | max_discard = 0; | |
2552 | } | |
2553 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
12182aff UH |
2554 | mmc_hostname(host), max_discard, host->max_busy_timeout ? |
2555 | host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS); | |
e056a1b5 AH |
2556 | return max_discard; |
2557 | } | |
2558 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
2559 | ||
33e6d74d UH |
2560 | bool mmc_card_is_blockaddr(struct mmc_card *card) |
2561 | { | |
2562 | return card ? mmc_card_blockaddr(card) : false; | |
2563 | } | |
2564 | EXPORT_SYMBOL(mmc_card_is_blockaddr); | |
2565 | ||
0f8d8ea6 AH |
2566 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
2567 | { | |
c7836d15 | 2568 | struct mmc_command cmd = {}; |
0f8d8ea6 | 2569 | |
1712c937 ZX |
2570 | if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) || |
2571 | mmc_card_hs400(card) || mmc_card_hs400es(card)) | |
0f8d8ea6 AH |
2572 | return 0; |
2573 | ||
0f8d8ea6 AH |
2574 | cmd.opcode = MMC_SET_BLOCKLEN; |
2575 | cmd.arg = blocklen; | |
2576 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2577 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2578 | } | |
2579 | EXPORT_SYMBOL(mmc_set_blocklen); | |
2580 | ||
67c79db8 LP |
2581 | int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount, |
2582 | bool is_rel_write) | |
2583 | { | |
c7836d15 | 2584 | struct mmc_command cmd = {}; |
67c79db8 LP |
2585 | |
2586 | cmd.opcode = MMC_SET_BLOCK_COUNT; | |
2587 | cmd.arg = blockcount & 0x0000FFFF; | |
2588 | if (is_rel_write) | |
2589 | cmd.arg |= 1 << 31; | |
2590 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2591 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2592 | } | |
2593 | EXPORT_SYMBOL(mmc_set_blockcount); | |
2594 | ||
b2499518 AH |
2595 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
2596 | { | |
52c8212d UH |
2597 | mmc_pwrseq_reset(host); |
2598 | ||
b2499518 AH |
2599 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) |
2600 | return; | |
b2499518 | 2601 | host->ops->hw_reset(host); |
b2499518 AH |
2602 | } |
2603 | ||
83533ab2 | 2604 | int mmc_hw_reset(struct mmc_host *host) |
b2499518 | 2605 | { |
f855a371 | 2606 | int ret; |
b2499518 | 2607 | |
f855a371 | 2608 | if (!host->card) |
b2499518 AH |
2609 | return -EINVAL; |
2610 | ||
f855a371 JR |
2611 | mmc_bus_get(host); |
2612 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) { | |
2613 | mmc_bus_put(host); | |
b2499518 | 2614 | return -EOPNOTSUPP; |
b2499518 AH |
2615 | } |
2616 | ||
f855a371 JR |
2617 | ret = host->bus_ops->reset(host); |
2618 | mmc_bus_put(host); | |
b2499518 | 2619 | |
4e6c7178 GG |
2620 | if (ret) |
2621 | pr_warn("%s: tried to reset card, got error %d\n", | |
2622 | mmc_hostname(host), ret); | |
b2499518 | 2623 | |
f855a371 | 2624 | return ret; |
b2499518 | 2625 | } |
b2499518 AH |
2626 | EXPORT_SYMBOL(mmc_hw_reset); |
2627 | ||
807e8e40 AR |
2628 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2629 | { | |
2630 | host->f_init = freq; | |
2631 | ||
69f25f9b | 2632 | pr_debug("%s: %s: trying to init card at %u Hz\n", |
807e8e40 | 2633 | mmc_hostname(host), __func__, host->f_init); |
69f25f9b | 2634 | |
4a065193 | 2635 | mmc_power_up(host, host->ocr_avail); |
2f94e55a | 2636 | |
b2499518 AH |
2637 | /* |
2638 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2639 | * do a hardware reset if possible. | |
2640 | */ | |
2641 | mmc_hw_reset_for_init(host); | |
2642 | ||
2f94e55a PR |
2643 | /* |
2644 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2645 | * if the card is being re-initialized, just send it. CMD52 | |
2646 | * should be ignored by SD/eMMC cards. | |
100a606d | 2647 | * Skip it if we already know that we do not support SDIO commands |
2f94e55a | 2648 | */ |
100a606d CC |
2649 | if (!(host->caps2 & MMC_CAP2_NO_SDIO)) |
2650 | sdio_reset(host); | |
2651 | ||
807e8e40 AR |
2652 | mmc_go_idle(host); |
2653 | ||
1b8d79c5 UH |
2654 | if (!(host->caps2 & MMC_CAP2_NO_SD)) |
2655 | mmc_send_if_cond(host, host->ocr_avail); | |
807e8e40 AR |
2656 | |
2657 | /* Order's important: probe SDIO, then SD, then MMC */ | |
100a606d CC |
2658 | if (!(host->caps2 & MMC_CAP2_NO_SDIO)) |
2659 | if (!mmc_attach_sdio(host)) | |
2660 | return 0; | |
2661 | ||
1b8d79c5 UH |
2662 | if (!(host->caps2 & MMC_CAP2_NO_SD)) |
2663 | if (!mmc_attach_sd(host)) | |
2664 | return 0; | |
2665 | ||
a0c3b68c SL |
2666 | if (!(host->caps2 & MMC_CAP2_NO_MMC)) |
2667 | if (!mmc_attach_mmc(host)) | |
2668 | return 0; | |
807e8e40 AR |
2669 | |
2670 | mmc_power_off(host); | |
2671 | return -EIO; | |
2672 | } | |
2673 | ||
d3049504 AH |
2674 | int _mmc_detect_card_removed(struct mmc_host *host) |
2675 | { | |
2676 | int ret; | |
2677 | ||
d3049504 AH |
2678 | if (!host->card || mmc_card_removed(host->card)) |
2679 | return 1; | |
2680 | ||
2681 | ret = host->bus_ops->alive(host); | |
1450734e KL |
2682 | |
2683 | /* | |
2684 | * Card detect status and alive check may be out of sync if card is | |
2685 | * removed slowly, when card detect switch changes while card/slot | |
2686 | * pads are still contacted in hardware (refer to "SD Card Mechanical | |
2687 | * Addendum, Appendix C: Card Detection Switch"). So reschedule a | |
2688 | * detect work 200ms later for this case. | |
2689 | */ | |
2690 | if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) { | |
2691 | mmc_detect_change(host, msecs_to_jiffies(200)); | |
2692 | pr_debug("%s: card removed too slowly\n", mmc_hostname(host)); | |
2693 | } | |
2694 | ||
d3049504 AH |
2695 | if (ret) { |
2696 | mmc_card_set_removed(host->card); | |
2697 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2698 | } | |
2699 | ||
2700 | return ret; | |
2701 | } | |
2702 | ||
2703 | int mmc_detect_card_removed(struct mmc_host *host) | |
2704 | { | |
2705 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2706 | int ret; |
d3049504 AH |
2707 | |
2708 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2709 | |
2710 | if (!card) | |
2711 | return 1; | |
2712 | ||
6067bafe | 2713 | if (!mmc_card_is_removable(host)) |
1ff2575b UH |
2714 | return 0; |
2715 | ||
f0cc9cf9 | 2716 | ret = mmc_card_removed(card); |
d3049504 AH |
2717 | /* |
2718 | * The card will be considered unchanged unless we have been asked to | |
2719 | * detect a change or host requires polling to provide card detection. | |
2720 | */ | |
b6891679 | 2721 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) |
f0cc9cf9 | 2722 | return ret; |
d3049504 AH |
2723 | |
2724 | host->detect_change = 0; | |
f0cc9cf9 UH |
2725 | if (!ret) { |
2726 | ret = _mmc_detect_card_removed(host); | |
b6891679 | 2727 | if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) { |
f0cc9cf9 UH |
2728 | /* |
2729 | * Schedule a detect work as soon as possible to let a | |
2730 | * rescan handle the card removal. | |
2731 | */ | |
2732 | cancel_delayed_work(&host->detect); | |
bbd43682 | 2733 | _mmc_detect_change(host, 0, false); |
f0cc9cf9 UH |
2734 | } |
2735 | } | |
d3049504 | 2736 | |
f0cc9cf9 | 2737 | return ret; |
d3049504 AH |
2738 | } |
2739 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2740 | ||
b93931a6 | 2741 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2742 | { |
c4028958 DH |
2743 | struct mmc_host *host = |
2744 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2745 | int i; |
4c2ef25f | 2746 | |
807e8e40 | 2747 | if (host->rescan_disable) |
4c2ef25f | 2748 | return; |
1da177e4 | 2749 | |
3339d1e3 | 2750 | /* If there is a non-removable card registered, only scan once */ |
6067bafe | 2751 | if (!mmc_card_is_removable(host) && host->rescan_entered) |
3339d1e3 JR |
2752 | return; |
2753 | host->rescan_entered = 1; | |
2754 | ||
86236813 | 2755 | if (host->trigger_card_event && host->ops->card_event) { |
d234d212 | 2756 | mmc_claim_host(host); |
86236813 | 2757 | host->ops->card_event(host); |
d234d212 | 2758 | mmc_release_host(host); |
86236813 UH |
2759 | host->trigger_card_event = false; |
2760 | } | |
2761 | ||
7ea239d9 | 2762 | mmc_bus_get(host); |
b855885e | 2763 | |
30201e7f OBC |
2764 | /* |
2765 | * if there is a _removable_ card registered, check whether it is | |
2766 | * still present | |
2767 | */ | |
6067bafe | 2768 | if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host)) |
94d89efb JS |
2769 | host->bus_ops->detect(host); |
2770 | ||
d3049504 AH |
2771 | host->detect_change = 0; |
2772 | ||
c5841798 CB |
2773 | /* |
2774 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2775 | * the card is no longer present. | |
2776 | */ | |
94d89efb | 2777 | mmc_bus_put(host); |
94d89efb JS |
2778 | mmc_bus_get(host); |
2779 | ||
2780 | /* if there still is a card present, stop here */ | |
2781 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2782 | mmc_bus_put(host); |
94d89efb JS |
2783 | goto out; |
2784 | } | |
1da177e4 | 2785 | |
94d89efb JS |
2786 | /* |
2787 | * Only we can add a new handler, so it's safe to | |
2788 | * release the lock here. | |
2789 | */ | |
2790 | mmc_bus_put(host); | |
1da177e4 | 2791 | |
d234d212 | 2792 | mmc_claim_host(host); |
6067bafe | 2793 | if (mmc_card_is_removable(host) && host->ops->get_cd && |
c1b55bfc | 2794 | host->ops->get_cd(host) == 0) { |
fa550189 UH |
2795 | mmc_power_off(host); |
2796 | mmc_release_host(host); | |
94d89efb | 2797 | goto out; |
fa550189 | 2798 | } |
1da177e4 | 2799 | |
88ae8b86 | 2800 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2801 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2802 | break; | |
06b2233a | 2803 | if (freqs[i] <= host->f_min) |
807e8e40 | 2804 | break; |
88ae8b86 | 2805 | } |
807e8e40 AR |
2806 | mmc_release_host(host); |
2807 | ||
2808 | out: | |
28f52482 AV |
2809 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2810 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2811 | } |
2812 | ||
b93931a6 | 2813 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2814 | { |
fa550189 | 2815 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2816 | host->rescan_disable = 0; |
8af465db | 2817 | host->ios.power_mode = MMC_POWER_UNDEFINED; |
8d1ffc8c | 2818 | |
c2c24819 UH |
2819 | if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) { |
2820 | mmc_claim_host(host); | |
4a065193 | 2821 | mmc_power_up(host, host->ocr_avail); |
c2c24819 UH |
2822 | mmc_release_host(host); |
2823 | } | |
8d1ffc8c | 2824 | |
740a221e | 2825 | mmc_gpiod_request_cd_irq(host); |
bbd43682 | 2826 | _mmc_detect_change(host, 0, false); |
1da177e4 LT |
2827 | } |
2828 | ||
b93931a6 | 2829 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2830 | { |
03dbaa04 AH |
2831 | if (host->slot.cd_irq >= 0) { |
2832 | if (host->slot.cd_wake_enabled) | |
2833 | disable_irq_wake(host->slot.cd_irq); | |
740a221e | 2834 | disable_irq(host->slot.cd_irq); |
03dbaa04 | 2835 | } |
3b91e550 | 2836 | |
d9adcc12 | 2837 | host->rescan_disable = 1; |
d9bcbf34 | 2838 | cancel_delayed_work_sync(&host->detect); |
3b91e550 | 2839 | |
da68c4eb NP |
2840 | /* clear pm flags now and let card drivers set them as needed */ |
2841 | host->pm_flags = 0; | |
2842 | ||
7ea239d9 PO |
2843 | mmc_bus_get(host); |
2844 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2845 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2846 | host->bus_ops->remove(host); |
7ea239d9 PO |
2847 | mmc_claim_host(host); |
2848 | mmc_detach_bus(host); | |
7f7e4129 | 2849 | mmc_power_off(host); |
7ea239d9 | 2850 | mmc_release_host(host); |
53509f0f DK |
2851 | mmc_bus_put(host); |
2852 | return; | |
1da177e4 | 2853 | } |
7ea239d9 PO |
2854 | mmc_bus_put(host); |
2855 | ||
8d1ffc8c | 2856 | mmc_claim_host(host); |
1da177e4 | 2857 | mmc_power_off(host); |
8d1ffc8c | 2858 | mmc_release_host(host); |
1da177e4 LT |
2859 | } |
2860 | ||
12ae637f | 2861 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2862 | { |
12ae637f OBC |
2863 | int ret = 0; |
2864 | ||
69f25f9b | 2865 | pr_debug("%s: %s: powering down\n", mmc_hostname(host), __func__); |
bb9cab94 | 2866 | |
eae1aeee AH |
2867 | mmc_bus_get(host); |
2868 | ||
5601aaf7 | 2869 | if (!host->bus_ops || host->bus_dead) { |
eae1aeee | 2870 | mmc_bus_put(host); |
12ae637f | 2871 | return -EINVAL; |
eae1aeee AH |
2872 | } |
2873 | ||
2874 | if (host->bus_ops->power_save) | |
12ae637f | 2875 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2876 | |
2877 | mmc_bus_put(host); | |
2878 | ||
2879 | mmc_power_off(host); | |
12ae637f OBC |
2880 | |
2881 | return ret; | |
eae1aeee AH |
2882 | } |
2883 | EXPORT_SYMBOL(mmc_power_save_host); | |
2884 | ||
12ae637f | 2885 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2886 | { |
12ae637f OBC |
2887 | int ret; |
2888 | ||
69f25f9b | 2889 | pr_debug("%s: %s: powering up\n", mmc_hostname(host), __func__); |
bb9cab94 | 2890 | |
eae1aeee AH |
2891 | mmc_bus_get(host); |
2892 | ||
5601aaf7 | 2893 | if (!host->bus_ops || host->bus_dead) { |
eae1aeee | 2894 | mmc_bus_put(host); |
12ae637f | 2895 | return -EINVAL; |
eae1aeee AH |
2896 | } |
2897 | ||
69041150 | 2898 | mmc_power_up(host, host->card->ocr); |
12ae637f | 2899 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2900 | |
2901 | mmc_bus_put(host); | |
12ae637f OBC |
2902 | |
2903 | return ret; | |
eae1aeee AH |
2904 | } |
2905 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2906 | ||
8dede18e | 2907 | #ifdef CONFIG_PM_SLEEP |
4c2ef25f ML |
2908 | /* Do the card removal on suspend if card is assumed removeable |
2909 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2910 | to sync the card. | |
2911 | */ | |
8dede18e UH |
2912 | static int mmc_pm_notify(struct notifier_block *notify_block, |
2913 | unsigned long mode, void *unused) | |
4c2ef25f ML |
2914 | { |
2915 | struct mmc_host *host = container_of( | |
2916 | notify_block, struct mmc_host, pm_notify); | |
2917 | unsigned long flags; | |
810caddb | 2918 | int err = 0; |
4c2ef25f ML |
2919 | |
2920 | switch (mode) { | |
2921 | case PM_HIBERNATION_PREPARE: | |
2922 | case PM_SUSPEND_PREPARE: | |
184af16b | 2923 | case PM_RESTORE_PREPARE: |
4c2ef25f ML |
2924 | spin_lock_irqsave(&host->lock, flags); |
2925 | host->rescan_disable = 1; | |
2926 | spin_unlock_irqrestore(&host->lock, flags); | |
2927 | cancel_delayed_work_sync(&host->detect); | |
2928 | ||
810caddb UH |
2929 | if (!host->bus_ops) |
2930 | break; | |
2931 | ||
2932 | /* Validate prerequisites for suspend */ | |
2933 | if (host->bus_ops->pre_suspend) | |
2934 | err = host->bus_ops->pre_suspend(host); | |
5601aaf7 | 2935 | if (!err) |
4c2ef25f ML |
2936 | break; |
2937 | ||
0db13fc2 | 2938 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2939 | host->bus_ops->remove(host); |
0db13fc2 | 2940 | mmc_claim_host(host); |
4c2ef25f | 2941 | mmc_detach_bus(host); |
7f7e4129 | 2942 | mmc_power_off(host); |
4c2ef25f ML |
2943 | mmc_release_host(host); |
2944 | host->pm_flags = 0; | |
2945 | break; | |
2946 | ||
2947 | case PM_POST_SUSPEND: | |
2948 | case PM_POST_HIBERNATION: | |
274476f8 | 2949 | case PM_POST_RESTORE: |
4c2ef25f ML |
2950 | |
2951 | spin_lock_irqsave(&host->lock, flags); | |
2952 | host->rescan_disable = 0; | |
2953 | spin_unlock_irqrestore(&host->lock, flags); | |
bbd43682 | 2954 | _mmc_detect_change(host, 0, false); |
4c2ef25f ML |
2955 | |
2956 | } | |
2957 | ||
2958 | return 0; | |
2959 | } | |
8dede18e UH |
2960 | |
2961 | void mmc_register_pm_notifier(struct mmc_host *host) | |
2962 | { | |
2963 | host->pm_notify.notifier_call = mmc_pm_notify; | |
2964 | register_pm_notifier(&host->pm_notify); | |
2965 | } | |
2966 | ||
2967 | void mmc_unregister_pm_notifier(struct mmc_host *host) | |
2968 | { | |
2969 | unregister_pm_notifier(&host->pm_notify); | |
2970 | } | |
1da177e4 LT |
2971 | #endif |
2972 | ||
2220eedf KD |
2973 | /** |
2974 | * mmc_init_context_info() - init synchronization context | |
2975 | * @host: mmc host | |
2976 | * | |
2977 | * Init struct context_info needed to implement asynchronous | |
2978 | * request mechanism, used by mmc core, host driver and mmc requests | |
2979 | * supplier. | |
2980 | */ | |
2981 | void mmc_init_context_info(struct mmc_host *host) | |
2982 | { | |
2220eedf KD |
2983 | host->context_info.is_new_req = false; |
2984 | host->context_info.is_done_rcv = false; | |
2985 | host->context_info.is_waiting_last_req = false; | |
2986 | init_waitqueue_head(&host->context_info.wait); | |
2987 | } | |
2988 | ||
ffce2e7e PO |
2989 | static int __init mmc_init(void) |
2990 | { | |
2991 | int ret; | |
2992 | ||
ffce2e7e | 2993 | ret = mmc_register_bus(); |
e29a7d73 | 2994 | if (ret) |
520bd7a8 | 2995 | return ret; |
e29a7d73 PO |
2996 | |
2997 | ret = mmc_register_host_class(); | |
2998 | if (ret) | |
2999 | goto unregister_bus; | |
3000 | ||
3001 | ret = sdio_register_bus(); | |
3002 | if (ret) | |
3003 | goto unregister_host_class; | |
3004 | ||
3005 | return 0; | |
3006 | ||
3007 | unregister_host_class: | |
3008 | mmc_unregister_host_class(); | |
3009 | unregister_bus: | |
3010 | mmc_unregister_bus(); | |
ffce2e7e PO |
3011 | return ret; |
3012 | } | |
3013 | ||
3014 | static void __exit mmc_exit(void) | |
3015 | { | |
e29a7d73 | 3016 | sdio_unregister_bus(); |
ffce2e7e PO |
3017 | mmc_unregister_host_class(); |
3018 | mmc_unregister_bus(); | |
ffce2e7e PO |
3019 | } |
3020 | ||
26074962 | 3021 | subsys_initcall(mmc_init); |
ffce2e7e PO |
3022 | module_exit(mmc_exit); |
3023 | ||
1da177e4 | 3024 | MODULE_LICENSE("GPL"); |