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Commit | Line | Data |
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1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
ad3868b2 | 6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
af8350c7 | 21 | #include <linux/leds.h> |
b57c43ad | 22 | #include <linux/scatterlist.h> |
86e8286a | 23 | #include <linux/log2.h> |
5c13941a | 24 | #include <linux/regulator/consumer.h> |
e594573d | 25 | #include <linux/pm_runtime.h> |
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 | ||
950d56ac JC |
56 | /* |
57 | * Background operations can take a long time, depending on the housekeeping | |
58 | * operations the card has to perform. | |
59 | */ | |
60 | #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */ | |
61 | ||
12182aff UH |
62 | /* The max erase timeout, used when host->max_busy_timeout isn't specified */ |
63 | #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */ | |
64 | ||
fa550189 | 65 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 66 | |
af517150 DB |
67 | /* |
68 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
69 | * performance cost, and for other reasons may not always be desired. | |
70 | * So we allow it it to be disabled. | |
71 | */ | |
90ab5ee9 | 72 | bool use_spi_crc = 1; |
af517150 DB |
73 | module_param(use_spi_crc, bool, 0); |
74 | ||
ffce2e7e PO |
75 | static int mmc_schedule_delayed_work(struct delayed_work *work, |
76 | unsigned long delay) | |
77 | { | |
520bd7a8 UH |
78 | /* |
79 | * We use the system_freezable_wq, because of two reasons. | |
80 | * First, it allows several works (not the same work item) to be | |
81 | * executed simultaneously. Second, the queue becomes frozen when | |
82 | * userspace becomes frozen during system PM. | |
83 | */ | |
84 | return queue_delayed_work(system_freezable_wq, work, delay); | |
ffce2e7e PO |
85 | } |
86 | ||
1b676f70 PF |
87 | #ifdef CONFIG_FAIL_MMC_REQUEST |
88 | ||
89 | /* | |
90 | * Internal function. Inject random data errors. | |
91 | * If mmc_data is NULL no errors are injected. | |
92 | */ | |
93 | static void mmc_should_fail_request(struct mmc_host *host, | |
94 | struct mmc_request *mrq) | |
95 | { | |
96 | struct mmc_command *cmd = mrq->cmd; | |
97 | struct mmc_data *data = mrq->data; | |
98 | static const int data_errors[] = { | |
99 | -ETIMEDOUT, | |
100 | -EILSEQ, | |
101 | -EIO, | |
102 | }; | |
103 | ||
104 | if (!data) | |
105 | return; | |
106 | ||
107 | if (cmd->error || data->error || | |
108 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
109 | return; | |
110 | ||
2e744fcb AM |
111 | data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)]; |
112 | data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9; | |
1b676f70 PF |
113 | } |
114 | ||
115 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
116 | ||
117 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
118 | struct mmc_request *mrq) | |
119 | { | |
120 | } | |
121 | ||
122 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
123 | ||
5163af5a AH |
124 | static inline void mmc_complete_cmd(struct mmc_request *mrq) |
125 | { | |
126 | if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion)) | |
127 | complete_all(&mrq->cmd_completion); | |
128 | } | |
129 | ||
130 | void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq) | |
131 | { | |
132 | if (!mrq->cap_cmd_during_tfr) | |
133 | return; | |
134 | ||
135 | mmc_complete_cmd(mrq); | |
136 | ||
137 | pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n", | |
138 | mmc_hostname(host), mrq->cmd->opcode); | |
139 | } | |
140 | EXPORT_SYMBOL(mmc_command_done); | |
141 | ||
1da177e4 | 142 | /** |
fe10c6ab RK |
143 | * mmc_request_done - finish processing an MMC request |
144 | * @host: MMC host which completed request | |
145 | * @mrq: MMC request which request | |
1da177e4 LT |
146 | * |
147 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 148 | * their processing of a request. |
1da177e4 LT |
149 | */ |
150 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
151 | { | |
152 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
153 | int err = cmd->error; |
154 | ||
bd11e8bd | 155 | /* Flag re-tuning needed on CRC errors */ |
031277d4 CJ |
156 | if ((cmd->opcode != MMC_SEND_TUNING_BLOCK && |
157 | cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) && | |
158 | (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) || | |
bd11e8bd | 159 | (mrq->data && mrq->data->error == -EILSEQ) || |
031277d4 | 160 | (mrq->stop && mrq->stop->error == -EILSEQ))) |
bd11e8bd AH |
161 | mmc_retune_needed(host); |
162 | ||
af517150 DB |
163 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
164 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
165 | cmd->retries = 0; | |
166 | } | |
167 | ||
5163af5a AH |
168 | if (host->ongoing_mrq == mrq) |
169 | host->ongoing_mrq = NULL; | |
170 | ||
171 | mmc_complete_cmd(mrq); | |
172 | ||
7962fc37 BW |
173 | trace_mmc_request_done(host, mrq); |
174 | ||
d3049504 | 175 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
176 | /* |
177 | * Request starter must handle retries - see | |
178 | * mmc_wait_for_req_done(). | |
179 | */ | |
180 | if (mrq->done) | |
181 | mrq->done(mrq); | |
e4d21708 | 182 | } else { |
1b676f70 PF |
183 | mmc_should_fail_request(host, mrq); |
184 | ||
5163af5a AH |
185 | if (!host->ongoing_mrq) |
186 | led_trigger_event(host->led, LED_OFF); | |
af8350c7 | 187 | |
fc75b708 AG |
188 | if (mrq->sbc) { |
189 | pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n", | |
190 | mmc_hostname(host), mrq->sbc->opcode, | |
191 | mrq->sbc->error, | |
192 | mrq->sbc->resp[0], mrq->sbc->resp[1], | |
193 | mrq->sbc->resp[2], mrq->sbc->resp[3]); | |
194 | } | |
195 | ||
e4d21708 PO |
196 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
197 | mmc_hostname(host), cmd->opcode, err, | |
198 | cmd->resp[0], cmd->resp[1], | |
199 | cmd->resp[2], cmd->resp[3]); | |
200 | ||
201 | if (mrq->data) { | |
202 | pr_debug("%s: %d bytes transferred: %d\n", | |
203 | mmc_hostname(host), | |
204 | mrq->data->bytes_xfered, mrq->data->error); | |
205 | } | |
206 | ||
207 | if (mrq->stop) { | |
208 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
209 | mmc_hostname(host), mrq->stop->opcode, | |
210 | mrq->stop->error, | |
211 | mrq->stop->resp[0], mrq->stop->resp[1], | |
212 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
213 | } | |
214 | ||
215 | if (mrq->done) | |
216 | mrq->done(mrq); | |
1da177e4 LT |
217 | } |
218 | } | |
219 | ||
220 | EXPORT_SYMBOL(mmc_request_done); | |
221 | ||
90a81489 AH |
222 | static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
223 | { | |
224 | int err; | |
225 | ||
226 | /* Assumes host controller has been runtime resumed by mmc_claim_host */ | |
227 | err = mmc_retune(host); | |
228 | if (err) { | |
229 | mrq->cmd->error = err; | |
230 | mmc_request_done(host, mrq); | |
231 | return; | |
232 | } | |
233 | ||
5d3f6ef0 HG |
234 | /* |
235 | * For sdio rw commands we must wait for card busy otherwise some | |
236 | * sdio devices won't work properly. | |
237 | */ | |
238 | if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) { | |
239 | int tries = 500; /* Wait aprox 500ms at maximum */ | |
240 | ||
241 | while (host->ops->card_busy(host) && --tries) | |
242 | mmc_delay(1); | |
243 | ||
244 | if (tries == 0) { | |
245 | mrq->cmd->error = -EBUSY; | |
246 | mmc_request_done(host, mrq); | |
247 | return; | |
248 | } | |
249 | } | |
250 | ||
5163af5a AH |
251 | if (mrq->cap_cmd_during_tfr) { |
252 | host->ongoing_mrq = mrq; | |
253 | /* | |
254 | * Retry path could come through here without having waiting on | |
255 | * cmd_completion, so ensure it is reinitialised. | |
256 | */ | |
257 | reinit_completion(&mrq->cmd_completion); | |
258 | } | |
259 | ||
7962fc37 BW |
260 | trace_mmc_request_start(host, mrq); |
261 | ||
90a81489 AH |
262 | host->ops->request(host, mrq); |
263 | } | |
264 | ||
f100c1c2 | 265 | static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
1da177e4 | 266 | { |
976d9276 PO |
267 | #ifdef CONFIG_MMC_DEBUG |
268 | unsigned int i, sz; | |
a84756c5 | 269 | struct scatterlist *sg; |
976d9276 | 270 | #endif |
90a81489 AH |
271 | mmc_retune_hold(host); |
272 | ||
f100c1c2 AH |
273 | if (mmc_card_removed(host->card)) |
274 | return -ENOMEDIUM; | |
976d9276 | 275 | |
7b2fd4f2 JC |
276 | if (mrq->sbc) { |
277 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
278 | mmc_hostname(host), mrq->sbc->opcode, | |
279 | mrq->sbc->arg, mrq->sbc->flags); | |
280 | } | |
281 | ||
920e70c5 RK |
282 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
283 | mmc_hostname(host), mrq->cmd->opcode, | |
284 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 285 | |
e4d21708 PO |
286 | if (mrq->data) { |
287 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
288 | "tsac %d ms nsac %d\n", | |
289 | mmc_hostname(host), mrq->data->blksz, | |
290 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 291 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
292 | mrq->data->timeout_clks); |
293 | } | |
294 | ||
295 | if (mrq->stop) { | |
296 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
297 | mmc_hostname(host), mrq->stop->opcode, | |
298 | mrq->stop->arg, mrq->stop->flags); | |
299 | } | |
300 | ||
f22ee4ed | 301 | WARN_ON(!host->claimed); |
1da177e4 LT |
302 | |
303 | mrq->cmd->error = 0; | |
304 | mrq->cmd->mrq = mrq; | |
cce411e6 AG |
305 | if (mrq->sbc) { |
306 | mrq->sbc->error = 0; | |
307 | mrq->sbc->mrq = mrq; | |
308 | } | |
1da177e4 | 309 | if (mrq->data) { |
6ff897ff SL |
310 | if (mrq->data->blksz > host->max_blk_size || |
311 | mrq->data->blocks > host->max_blk_count || | |
312 | mrq->data->blocks * mrq->data->blksz > host->max_req_size) | |
313 | return -EINVAL; | |
976d9276 PO |
314 | #ifdef CONFIG_MMC_DEBUG |
315 | sz = 0; | |
a84756c5 PO |
316 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
317 | sz += sg->length; | |
6ff897ff SL |
318 | if (sz != mrq->data->blocks * mrq->data->blksz) |
319 | return -EINVAL; | |
976d9276 PO |
320 | #endif |
321 | ||
1da177e4 LT |
322 | mrq->cmd->data = mrq->data; |
323 | mrq->data->error = 0; | |
324 | mrq->data->mrq = mrq; | |
325 | if (mrq->stop) { | |
326 | mrq->data->stop = mrq->stop; | |
327 | mrq->stop->error = 0; | |
328 | mrq->stop->mrq = mrq; | |
329 | } | |
330 | } | |
66c036e0 | 331 | led_trigger_event(host->led, LED_FULL); |
90a81489 | 332 | __mmc_start_request(host, mrq); |
f100c1c2 AH |
333 | |
334 | return 0; | |
1da177e4 LT |
335 | } |
336 | ||
950d56ac JC |
337 | /** |
338 | * mmc_start_bkops - start BKOPS for supported cards | |
339 | * @card: MMC card to start BKOPS | |
340 | * @form_exception: A flag to indicate if this function was | |
341 | * called due to an exception raised by the card | |
342 | * | |
343 | * Start background operations whenever requested. | |
344 | * When the urgent BKOPS bit is set in a R1 command response | |
345 | * then background operations should be started immediately. | |
346 | */ | |
347 | void mmc_start_bkops(struct mmc_card *card, bool from_exception) | |
348 | { | |
349 | int err; | |
350 | int timeout; | |
351 | bool use_busy_signal; | |
352 | ||
0501be64 | 353 | if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card)) |
950d56ac JC |
354 | return; |
355 | ||
356 | err = mmc_read_bkops_status(card); | |
357 | if (err) { | |
358 | pr_err("%s: Failed to read bkops status: %d\n", | |
359 | mmc_hostname(card->host), err); | |
360 | return; | |
361 | } | |
362 | ||
363 | if (!card->ext_csd.raw_bkops_status) | |
364 | return; | |
365 | ||
366 | if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 && | |
367 | from_exception) | |
368 | return; | |
369 | ||
370 | mmc_claim_host(card->host); | |
371 | if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) { | |
372 | timeout = MMC_BKOPS_MAX_TIMEOUT; | |
373 | use_busy_signal = true; | |
374 | } else { | |
375 | timeout = 0; | |
376 | use_busy_signal = false; | |
377 | } | |
378 | ||
66073d86 AH |
379 | mmc_retune_hold(card->host); |
380 | ||
950d56ac | 381 | err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
aa33ce3c | 382 | EXT_CSD_BKOPS_START, 1, timeout, 0, |
4509f847 | 383 | use_busy_signal, true, false); |
950d56ac JC |
384 | if (err) { |
385 | pr_warn("%s: Error %d starting bkops\n", | |
386 | mmc_hostname(card->host), err); | |
66073d86 | 387 | mmc_retune_release(card->host); |
950d56ac JC |
388 | goto out; |
389 | } | |
390 | ||
391 | /* | |
392 | * For urgent bkops status (LEVEL_2 and more) | |
393 | * bkops executed synchronously, otherwise | |
394 | * the operation is in progress | |
395 | */ | |
396 | if (!use_busy_signal) | |
397 | mmc_card_set_doing_bkops(card); | |
66073d86 AH |
398 | else |
399 | mmc_retune_release(card->host); | |
950d56ac JC |
400 | out: |
401 | mmc_release_host(card->host); | |
402 | } | |
403 | EXPORT_SYMBOL(mmc_start_bkops); | |
404 | ||
2220eedf KD |
405 | /* |
406 | * mmc_wait_data_done() - done callback for data request | |
407 | * @mrq: done data request | |
408 | * | |
409 | * Wakes up mmc context, passed as a callback to host controller driver | |
410 | */ | |
411 | static void mmc_wait_data_done(struct mmc_request *mrq) | |
412 | { | |
71f8a4b8 JF |
413 | struct mmc_context_info *context_info = &mrq->host->context_info; |
414 | ||
415 | context_info->is_done_rcv = true; | |
416 | wake_up_interruptible(&context_info->wait); | |
2220eedf KD |
417 | } |
418 | ||
1da177e4 LT |
419 | static void mmc_wait_done(struct mmc_request *mrq) |
420 | { | |
aa8b683a PF |
421 | complete(&mrq->completion); |
422 | } | |
423 | ||
5163af5a AH |
424 | static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host) |
425 | { | |
426 | struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq); | |
427 | ||
428 | /* | |
429 | * If there is an ongoing transfer, wait for the command line to become | |
430 | * available. | |
431 | */ | |
432 | if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion)) | |
433 | wait_for_completion(&ongoing_mrq->cmd_completion); | |
434 | } | |
435 | ||
2220eedf KD |
436 | /* |
437 | *__mmc_start_data_req() - starts data request | |
438 | * @host: MMC host to start the request | |
439 | * @mrq: data request to start | |
440 | * | |
441 | * Sets the done callback to be called when request is completed by the card. | |
442 | * Starts data mmc request execution | |
5163af5a AH |
443 | * If an ongoing transfer is already in progress, wait for the command line |
444 | * to become available before sending another command. | |
2220eedf KD |
445 | */ |
446 | static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq) | |
447 | { | |
f100c1c2 AH |
448 | int err; |
449 | ||
5163af5a AH |
450 | mmc_wait_ongoing_tfr_cmd(host); |
451 | ||
2220eedf KD |
452 | mrq->done = mmc_wait_data_done; |
453 | mrq->host = host; | |
f100c1c2 | 454 | |
5163af5a AH |
455 | init_completion(&mrq->cmd_completion); |
456 | ||
f100c1c2 AH |
457 | err = mmc_start_request(host, mrq); |
458 | if (err) { | |
459 | mrq->cmd->error = err; | |
5163af5a | 460 | mmc_complete_cmd(mrq); |
9b844961 | 461 | mmc_wait_data_done(mrq); |
2220eedf | 462 | } |
2220eedf | 463 | |
f100c1c2 | 464 | return err; |
2220eedf KD |
465 | } |
466 | ||
956d9fd5 | 467 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 468 | { |
f100c1c2 AH |
469 | int err; |
470 | ||
5163af5a AH |
471 | mmc_wait_ongoing_tfr_cmd(host); |
472 | ||
aa8b683a PF |
473 | init_completion(&mrq->completion); |
474 | mrq->done = mmc_wait_done; | |
f100c1c2 | 475 | |
5163af5a AH |
476 | init_completion(&mrq->cmd_completion); |
477 | ||
f100c1c2 AH |
478 | err = mmc_start_request(host, mrq); |
479 | if (err) { | |
480 | mrq->cmd->error = err; | |
5163af5a | 481 | mmc_complete_cmd(mrq); |
d3049504 | 482 | complete(&mrq->completion); |
d3049504 | 483 | } |
f100c1c2 AH |
484 | |
485 | return err; | |
aa8b683a PF |
486 | } |
487 | ||
2220eedf KD |
488 | /* |
489 | * mmc_wait_for_data_req_done() - wait for request completed | |
490 | * @host: MMC host to prepare the command. | |
491 | * @mrq: MMC request to wait for | |
492 | * | |
493 | * Blocks MMC context till host controller will ack end of data request | |
494 | * execution or new request notification arrives from the block layer. | |
495 | * Handles command retries. | |
496 | * | |
497 | * Returns enum mmc_blk_status after checking errors. | |
498 | */ | |
8e8b3f51 | 499 | static enum mmc_blk_status mmc_wait_for_data_req_done(struct mmc_host *host, |
15520111 | 500 | struct mmc_request *mrq) |
2220eedf KD |
501 | { |
502 | struct mmc_command *cmd; | |
503 | struct mmc_context_info *context_info = &host->context_info; | |
8e8b3f51 | 504 | enum mmc_blk_status status; |
2220eedf KD |
505 | |
506 | while (1) { | |
507 | wait_event_interruptible(context_info->wait, | |
508 | (context_info->is_done_rcv || | |
509 | context_info->is_new_req)); | |
15520111 | 510 | |
2220eedf KD |
511 | if (context_info->is_done_rcv) { |
512 | context_info->is_done_rcv = false; | |
2220eedf | 513 | cmd = mrq->cmd; |
775a9362 | 514 | |
2220eedf KD |
515 | if (!cmd->error || !cmd->retries || |
516 | mmc_card_removed(host->card)) { | |
8e8b3f51 LW |
517 | status = host->areq->err_check(host->card, |
518 | host->areq); | |
519 | break; /* return status */ | |
2220eedf | 520 | } else { |
90a81489 | 521 | mmc_retune_recheck(host); |
2220eedf KD |
522 | pr_info("%s: req failed (CMD%u): %d, retrying...\n", |
523 | mmc_hostname(host), | |
524 | cmd->opcode, cmd->error); | |
525 | cmd->retries--; | |
526 | cmd->error = 0; | |
90a81489 | 527 | __mmc_start_request(host, mrq); |
2220eedf KD |
528 | continue; /* wait for done/new event again */ |
529 | } | |
2220eedf | 530 | } |
15520111 AH |
531 | |
532 | return MMC_BLK_NEW_REQUEST; | |
2220eedf | 533 | } |
90a81489 | 534 | mmc_retune_release(host); |
8e8b3f51 | 535 | return status; |
2220eedf KD |
536 | } |
537 | ||
5163af5a | 538 | void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 539 | { |
08a7e1df AH |
540 | struct mmc_command *cmd; |
541 | ||
542 | while (1) { | |
543 | wait_for_completion(&mrq->completion); | |
544 | ||
545 | cmd = mrq->cmd; | |
775a9362 ME |
546 | |
547 | /* | |
548 | * If host has timed out waiting for the sanitize | |
549 | * to complete, card might be still in programming state | |
550 | * so let's try to bring the card out of programming | |
551 | * state. | |
552 | */ | |
553 | if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) { | |
554 | if (!mmc_interrupt_hpi(host->card)) { | |
6606110d JP |
555 | pr_warn("%s: %s: Interrupted sanitize\n", |
556 | mmc_hostname(host), __func__); | |
775a9362 ME |
557 | cmd->error = 0; |
558 | break; | |
559 | } else { | |
560 | pr_err("%s: %s: Failed to interrupt sanitize\n", | |
561 | mmc_hostname(host), __func__); | |
562 | } | |
563 | } | |
d3049504 AH |
564 | if (!cmd->error || !cmd->retries || |
565 | mmc_card_removed(host->card)) | |
08a7e1df AH |
566 | break; |
567 | ||
90a81489 AH |
568 | mmc_retune_recheck(host); |
569 | ||
08a7e1df AH |
570 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", |
571 | mmc_hostname(host), cmd->opcode, cmd->error); | |
572 | cmd->retries--; | |
573 | cmd->error = 0; | |
90a81489 | 574 | __mmc_start_request(host, mrq); |
08a7e1df | 575 | } |
90a81489 AH |
576 | |
577 | mmc_retune_release(host); | |
aa8b683a | 578 | } |
5163af5a AH |
579 | EXPORT_SYMBOL(mmc_wait_for_req_done); |
580 | ||
581 | /** | |
582 | * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done | |
583 | * @host: MMC host | |
584 | * @mrq: MMC request | |
585 | * | |
586 | * mmc_is_req_done() is used with requests that have | |
587 | * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after | |
588 | * starting a request and before waiting for it to complete. That is, | |
589 | * either in between calls to mmc_start_req(), or after mmc_wait_for_req() | |
590 | * and before mmc_wait_for_req_done(). If it is called at other times the | |
591 | * result is not meaningful. | |
592 | */ | |
593 | bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq) | |
594 | { | |
595 | if (host->areq) | |
596 | return host->context_info.is_done_rcv; | |
597 | else | |
598 | return completion_done(&mrq->completion); | |
599 | } | |
600 | EXPORT_SYMBOL(mmc_is_req_done); | |
aa8b683a PF |
601 | |
602 | /** | |
603 | * mmc_pre_req - Prepare for a new request | |
604 | * @host: MMC host to prepare command | |
605 | * @mrq: MMC request to prepare for | |
aa8b683a PF |
606 | * |
607 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
608 | * host prepare for the new request. Preparation of a request may be | |
609 | * performed while another request is running on the host. | |
610 | */ | |
d3c6aac3 | 611 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a | 612 | { |
9eadcc05 | 613 | if (host->ops->pre_req) |
d3c6aac3 | 614 | host->ops->pre_req(host, mrq); |
aa8b683a PF |
615 | } |
616 | ||
617 | /** | |
618 | * mmc_post_req - Post process a completed request | |
619 | * @host: MMC host to post process command | |
620 | * @mrq: MMC request to post process for | |
621 | * @err: Error, if non zero, clean up any resources made in pre_req | |
622 | * | |
623 | * Let the host post process a completed request. Post processing of | |
624 | * a request may be performed while another reuqest is running. | |
625 | */ | |
626 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
627 | int err) | |
628 | { | |
9eadcc05 | 629 | if (host->ops->post_req) |
aa8b683a | 630 | host->ops->post_req(host, mrq, err); |
1da177e4 LT |
631 | } |
632 | ||
37dac068 LW |
633 | /** |
634 | * mmc_finalize_areq() - finalize an asynchronous request | |
635 | * @host: MMC host to finalize any ongoing request on | |
636 | * | |
637 | * Returns the status of the ongoing asynchronous request, but | |
638 | * MMC_BLK_SUCCESS if no request was going on. | |
639 | */ | |
640 | static enum mmc_blk_status mmc_finalize_areq(struct mmc_host *host) | |
641 | { | |
642 | enum mmc_blk_status status; | |
643 | ||
644 | if (!host->areq) | |
645 | return MMC_BLK_SUCCESS; | |
646 | ||
647 | status = mmc_wait_for_data_req_done(host, host->areq->mrq); | |
648 | if (status == MMC_BLK_NEW_REQUEST) | |
649 | return status; | |
650 | ||
651 | /* | |
652 | * Check BKOPS urgency for each R1 response | |
653 | */ | |
654 | if (host->card && mmc_card_mmc(host->card) && | |
655 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
656 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
657 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) { | |
658 | mmc_start_bkops(host->card, true); | |
659 | } | |
660 | ||
661 | return status; | |
662 | } | |
663 | ||
aa8b683a | 664 | /** |
c3399ef5 | 665 | * mmc_start_areq - start an asynchronous request |
aa8b683a | 666 | * @host: MMC host to start command |
c3399ef5 LW |
667 | * @areq: asynchronous request to start |
668 | * @ret_stat: out parameter for status | |
aa8b683a PF |
669 | * |
670 | * Start a new MMC custom command request for a host. | |
671 | * If there is on ongoing async request wait for completion | |
672 | * of that request and start the new one and return. | |
673 | * Does not wait for the new request to complete. | |
674 | * | |
675 | * Returns the completed request, NULL in case of none completed. | |
676 | * Wait for the an ongoing request (previoulsy started) to complete and | |
677 | * return the completed request. If there is no ongoing request, NULL | |
678 | * is returned without waiting. NULL is not an error condition. | |
679 | */ | |
c3399ef5 LW |
680 | struct mmc_async_req *mmc_start_areq(struct mmc_host *host, |
681 | struct mmc_async_req *areq, | |
682 | enum mmc_blk_status *ret_stat) | |
aa8b683a | 683 | { |
37dac068 | 684 | enum mmc_blk_status status; |
956d9fd5 | 685 | int start_err = 0; |
aa8b683a PF |
686 | struct mmc_async_req *data = host->areq; |
687 | ||
688 | /* Prepare a new request */ | |
689 | if (areq) | |
d3c6aac3 | 690 | mmc_pre_req(host, areq->mrq); |
aa8b683a | 691 | |
37dac068 LW |
692 | /* Finalize previous request */ |
693 | status = mmc_finalize_areq(host); | |
694 | ||
695 | /* The previous request is still going on... */ | |
696 | if (status == MMC_BLK_NEW_REQUEST) { | |
697 | if (ret_stat) | |
698 | *ret_stat = status; | |
699 | return NULL; | |
aa8b683a PF |
700 | } |
701 | ||
37dac068 | 702 | /* Fine so far, start the new request! */ |
8e8b3f51 | 703 | if (status == MMC_BLK_SUCCESS && areq) |
2220eedf | 704 | start_err = __mmc_start_data_req(host, areq->mrq); |
aa8b683a | 705 | |
37dac068 | 706 | /* Postprocess the old request at this point */ |
aa8b683a PF |
707 | if (host->areq) |
708 | mmc_post_req(host, host->areq->mrq, 0); | |
709 | ||
37dac068 | 710 | /* Cancel a prepared request if it was not started. */ |
8e8b3f51 | 711 | if ((status != MMC_BLK_SUCCESS || start_err) && areq) |
f5c2758f | 712 | mmc_post_req(host, areq->mrq, -EINVAL); |
956d9fd5 | 713 | |
8e8b3f51 | 714 | if (status != MMC_BLK_SUCCESS) |
956d9fd5 UH |
715 | host->areq = NULL; |
716 | else | |
717 | host->areq = areq; | |
718 | ||
8e8b3f51 LW |
719 | if (ret_stat) |
720 | *ret_stat = status; | |
aa8b683a PF |
721 | return data; |
722 | } | |
c3399ef5 | 723 | EXPORT_SYMBOL(mmc_start_areq); |
aa8b683a | 724 | |
67a61c48 PO |
725 | /** |
726 | * mmc_wait_for_req - start a request and wait for completion | |
727 | * @host: MMC host to start command | |
728 | * @mrq: MMC request to start | |
729 | * | |
730 | * Start a new MMC custom command request for a host, and wait | |
5163af5a AH |
731 | * for the command to complete. In the case of 'cap_cmd_during_tfr' |
732 | * requests, the transfer is ongoing and the caller can issue further | |
733 | * commands that do not use the data lines, and then wait by calling | |
734 | * mmc_wait_for_req_done(). | |
735 | * Does not attempt to parse the response. | |
67a61c48 PO |
736 | */ |
737 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 738 | { |
aa8b683a | 739 | __mmc_start_req(host, mrq); |
5163af5a AH |
740 | |
741 | if (!mrq->cap_cmd_during_tfr) | |
742 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 743 | } |
1da177e4 LT |
744 | EXPORT_SYMBOL(mmc_wait_for_req); |
745 | ||
eb0d8f13 JC |
746 | /** |
747 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
748 | * @card: the MMC card associated with the HPI transfer | |
749 | * | |
750 | * Issued High Priority Interrupt, and check for card status | |
950d56ac | 751 | * until out-of prg-state. |
eb0d8f13 JC |
752 | */ |
753 | int mmc_interrupt_hpi(struct mmc_card *card) | |
754 | { | |
755 | int err; | |
756 | u32 status; | |
6af9e96e | 757 | unsigned long prg_wait; |
eb0d8f13 | 758 | |
eb0d8f13 JC |
759 | if (!card->ext_csd.hpi_en) { |
760 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
761 | return 1; | |
762 | } | |
763 | ||
764 | mmc_claim_host(card->host); | |
765 | err = mmc_send_status(card, &status); | |
766 | if (err) { | |
767 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
768 | goto out; | |
769 | } | |
770 | ||
6af9e96e V |
771 | switch (R1_CURRENT_STATE(status)) { |
772 | case R1_STATE_IDLE: | |
773 | case R1_STATE_READY: | |
774 | case R1_STATE_STBY: | |
211d4fe5 | 775 | case R1_STATE_TRAN: |
6af9e96e | 776 | /* |
211d4fe5 | 777 | * In idle and transfer states, HPI is not needed and the caller |
6af9e96e V |
778 | * can issue the next intended command immediately |
779 | */ | |
780 | goto out; | |
781 | case R1_STATE_PRG: | |
782 | break; | |
783 | default: | |
784 | /* In all other states, it's illegal to issue HPI */ | |
785 | pr_debug("%s: HPI cannot be sent. Card state=%d\n", | |
786 | mmc_hostname(card->host), R1_CURRENT_STATE(status)); | |
787 | err = -EINVAL; | |
788 | goto out; | |
789 | } | |
790 | ||
791 | err = mmc_send_hpi_cmd(card, &status); | |
792 | if (err) | |
793 | goto out; | |
794 | ||
795 | prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time); | |
796 | do { | |
797 | err = mmc_send_status(card, &status); | |
798 | ||
799 | if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN) | |
800 | break; | |
801 | if (time_after(jiffies, prg_wait)) | |
802 | err = -ETIMEDOUT; | |
803 | } while (!err); | |
eb0d8f13 JC |
804 | |
805 | out: | |
806 | mmc_release_host(card->host); | |
807 | return err; | |
808 | } | |
809 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
810 | ||
1da177e4 LT |
811 | /** |
812 | * mmc_wait_for_cmd - start a command and wait for completion | |
813 | * @host: MMC host to start command | |
814 | * @cmd: MMC command to start | |
815 | * @retries: maximum number of retries | |
816 | * | |
817 | * Start a new MMC command for a host, and wait for the command | |
818 | * to complete. Return any error that occurred while the command | |
819 | * was executing. Do not attempt to parse the response. | |
820 | */ | |
821 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
822 | { | |
c7836d15 | 823 | struct mmc_request mrq = {}; |
1da177e4 | 824 | |
d84075c8 | 825 | WARN_ON(!host->claimed); |
1da177e4 | 826 | |
1da177e4 LT |
827 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
828 | cmd->retries = retries; | |
829 | ||
830 | mrq.cmd = cmd; | |
831 | cmd->data = NULL; | |
832 | ||
833 | mmc_wait_for_req(host, &mrq); | |
834 | ||
835 | return cmd->error; | |
836 | } | |
837 | ||
838 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
839 | ||
950d56ac JC |
840 | /** |
841 | * mmc_stop_bkops - stop ongoing BKOPS | |
842 | * @card: MMC card to check BKOPS | |
843 | * | |
844 | * Send HPI command to stop ongoing background operations to | |
845 | * allow rapid servicing of foreground operations, e.g. read/ | |
846 | * writes. Wait until the card comes out of the programming state | |
847 | * to avoid errors in servicing read/write requests. | |
848 | */ | |
849 | int mmc_stop_bkops(struct mmc_card *card) | |
850 | { | |
851 | int err = 0; | |
852 | ||
950d56ac JC |
853 | err = mmc_interrupt_hpi(card); |
854 | ||
855 | /* | |
856 | * If err is EINVAL, we can't issue an HPI. | |
857 | * It should complete the BKOPS. | |
858 | */ | |
859 | if (!err || (err == -EINVAL)) { | |
860 | mmc_card_clr_doing_bkops(card); | |
66073d86 | 861 | mmc_retune_release(card->host); |
950d56ac JC |
862 | err = 0; |
863 | } | |
864 | ||
865 | return err; | |
866 | } | |
867 | EXPORT_SYMBOL(mmc_stop_bkops); | |
868 | ||
869 | int mmc_read_bkops_status(struct mmc_card *card) | |
870 | { | |
871 | int err; | |
872 | u8 *ext_csd; | |
873 | ||
950d56ac | 874 | mmc_claim_host(card->host); |
b2cada73 | 875 | err = mmc_get_ext_csd(card, &ext_csd); |
950d56ac JC |
876 | mmc_release_host(card->host); |
877 | if (err) | |
b2cada73 | 878 | return err; |
950d56ac JC |
879 | |
880 | card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; | |
881 | card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS]; | |
950d56ac | 882 | kfree(ext_csd); |
b2cada73 | 883 | return 0; |
950d56ac JC |
884 | } |
885 | EXPORT_SYMBOL(mmc_read_bkops_status); | |
886 | ||
d773d725 RK |
887 | /** |
888 | * mmc_set_data_timeout - set the timeout for a data command | |
889 | * @data: data phase for command | |
890 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
891 | * |
892 | * Computes the data timeout parameters according to the | |
893 | * correct algorithm given the card type. | |
d773d725 | 894 | */ |
b146d26a | 895 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
896 | { |
897 | unsigned int mult; | |
898 | ||
e6f918bf PO |
899 | /* |
900 | * SDIO cards only define an upper 1 s limit on access. | |
901 | */ | |
902 | if (mmc_card_sdio(card)) { | |
903 | data->timeout_ns = 1000000000; | |
904 | data->timeout_clks = 0; | |
905 | return; | |
906 | } | |
907 | ||
d773d725 RK |
908 | /* |
909 | * SD cards use a 100 multiplier rather than 10 | |
910 | */ | |
911 | mult = mmc_card_sd(card) ? 100 : 10; | |
912 | ||
913 | /* | |
914 | * Scale up the multiplier (and therefore the timeout) by | |
915 | * the r2w factor for writes. | |
916 | */ | |
b146d26a | 917 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
918 | mult <<= card->csd.r2w_factor; |
919 | ||
920 | data->timeout_ns = card->csd.tacc_ns * mult; | |
921 | data->timeout_clks = card->csd.tacc_clks * mult; | |
922 | ||
923 | /* | |
924 | * SD cards also have an upper limit on the timeout. | |
925 | */ | |
926 | if (mmc_card_sd(card)) { | |
927 | unsigned int timeout_us, limit_us; | |
928 | ||
929 | timeout_us = data->timeout_ns / 1000; | |
9eadcc05 | 930 | if (card->host->ios.clock) |
e9b86841 | 931 | timeout_us += data->timeout_clks * 1000 / |
9eadcc05 | 932 | (card->host->ios.clock / 1000); |
d773d725 | 933 | |
b146d26a | 934 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 935 | /* |
3bdc9ba8 PW |
936 | * The MMC spec "It is strongly recommended |
937 | * for hosts to implement more than 500ms | |
938 | * timeout value even if the card indicates | |
939 | * the 250ms maximum busy length." Even the | |
940 | * previous value of 300ms is known to be | |
941 | * insufficient for some cards. | |
493890e7 | 942 | */ |
3bdc9ba8 | 943 | limit_us = 3000000; |
d773d725 RK |
944 | else |
945 | limit_us = 100000; | |
946 | ||
fba68bd2 PL |
947 | /* |
948 | * SDHC cards always use these fixed values. | |
949 | */ | |
950 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
951 | data->timeout_ns = limit_us * 1000; |
952 | data->timeout_clks = 0; | |
953 | } | |
f7bf11a3 SW |
954 | |
955 | /* assign limit value if invalid */ | |
956 | if (timeout_us == 0) | |
957 | data->timeout_ns = limit_us * 1000; | |
d773d725 | 958 | } |
6de5fc9c SNX |
959 | |
960 | /* | |
961 | * Some cards require longer data read timeout than indicated in CSD. | |
962 | * Address this by setting the read timeout to a "reasonably high" | |
32ecd320 | 963 | * value. For the cards tested, 600ms has proven enough. If necessary, |
6de5fc9c SNX |
964 | * this value can be increased if other problematic cards require this. |
965 | */ | |
966 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
32ecd320 | 967 | data->timeout_ns = 600000000; |
6de5fc9c SNX |
968 | data->timeout_clks = 0; |
969 | } | |
970 | ||
c0c88871 WM |
971 | /* |
972 | * Some cards need very high timeouts if driven in SPI mode. | |
973 | * The worst observed timeout was 900ms after writing a | |
974 | * continuous stream of data until the internal logic | |
975 | * overflowed. | |
976 | */ | |
977 | if (mmc_host_is_spi(card->host)) { | |
978 | if (data->flags & MMC_DATA_WRITE) { | |
979 | if (data->timeout_ns < 1000000000) | |
980 | data->timeout_ns = 1000000000; /* 1s */ | |
981 | } else { | |
982 | if (data->timeout_ns < 100000000) | |
983 | data->timeout_ns = 100000000; /* 100ms */ | |
984 | } | |
985 | } | |
d773d725 RK |
986 | } |
987 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
988 | ||
ad3868b2 PO |
989 | /** |
990 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
991 | * @card: the MMC card associated with the data transfer | |
992 | * @sz: original transfer size | |
993 | * | |
994 | * Pads the original data size with a number of extra bytes in | |
995 | * order to avoid controller bugs and/or performance hits | |
996 | * (e.g. some controllers revert to PIO for certain sizes). | |
997 | * | |
998 | * Returns the improved size, which might be unmodified. | |
999 | * | |
1000 | * Note that this function is only relevant when issuing a | |
1001 | * single scatter gather entry. | |
1002 | */ | |
1003 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
1004 | { | |
1005 | /* | |
1006 | * FIXME: We don't have a system for the controller to tell | |
1007 | * the core about its problems yet, so for now we just 32-bit | |
1008 | * align the size. | |
1009 | */ | |
1010 | sz = ((sz + 3) / 4) * 4; | |
1011 | ||
1012 | return sz; | |
1013 | } | |
1014 | EXPORT_SYMBOL(mmc_align_data_size); | |
1015 | ||
1da177e4 | 1016 | /** |
2342f332 | 1017 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 1018 | * @host: mmc host to claim |
2342f332 | 1019 | * @abort: whether or not the operation should be aborted |
1da177e4 | 1020 | * |
2342f332 NP |
1021 | * Claim a host for a set of operations. If @abort is non null and |
1022 | * dereference a non-zero value then this will return prematurely with | |
1023 | * that non-zero value without acquiring the lock. Returns zero | |
1024 | * with the lock held otherwise. | |
1da177e4 | 1025 | */ |
2342f332 | 1026 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
1027 | { |
1028 | DECLARE_WAITQUEUE(wait, current); | |
1029 | unsigned long flags; | |
2342f332 | 1030 | int stop; |
9250aea7 | 1031 | bool pm = false; |
1da177e4 | 1032 | |
cf795bfb PO |
1033 | might_sleep(); |
1034 | ||
1da177e4 LT |
1035 | add_wait_queue(&host->wq, &wait); |
1036 | spin_lock_irqsave(&host->lock, flags); | |
1037 | while (1) { | |
1038 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 1039 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 1040 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
1041 | break; |
1042 | spin_unlock_irqrestore(&host->lock, flags); | |
1043 | schedule(); | |
1044 | spin_lock_irqsave(&host->lock, flags); | |
1045 | } | |
1046 | set_current_state(TASK_RUNNING); | |
319a3f14 | 1047 | if (!stop) { |
2342f332 | 1048 | host->claimed = 1; |
319a3f14 AH |
1049 | host->claimer = current; |
1050 | host->claim_cnt += 1; | |
9250aea7 UH |
1051 | if (host->claim_cnt == 1) |
1052 | pm = true; | |
319a3f14 | 1053 | } else |
2342f332 | 1054 | wake_up(&host->wq); |
1da177e4 LT |
1055 | spin_unlock_irqrestore(&host->lock, flags); |
1056 | remove_wait_queue(&host->wq, &wait); | |
9250aea7 UH |
1057 | |
1058 | if (pm) | |
1059 | pm_runtime_get_sync(mmc_dev(host)); | |
1060 | ||
2342f332 | 1061 | return stop; |
1da177e4 | 1062 | } |
2342f332 | 1063 | EXPORT_SYMBOL(__mmc_claim_host); |
8ea926b2 | 1064 | |
ab1efd27 | 1065 | /** |
907d2e7c | 1066 | * mmc_release_host - release a host |
ab1efd27 UH |
1067 | * @host: mmc host to release |
1068 | * | |
907d2e7c AH |
1069 | * Release a MMC host, allowing others to claim the host |
1070 | * for their operations. | |
ab1efd27 | 1071 | */ |
907d2e7c | 1072 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
1073 | { |
1074 | unsigned long flags; | |
1075 | ||
907d2e7c AH |
1076 | WARN_ON(!host->claimed); |
1077 | ||
8ea926b2 | 1078 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
1079 | if (--host->claim_cnt) { |
1080 | /* Release for nested claim */ | |
1081 | spin_unlock_irqrestore(&host->lock, flags); | |
1082 | } else { | |
1083 | host->claimed = 0; | |
1084 | host->claimer = NULL; | |
1085 | spin_unlock_irqrestore(&host->lock, flags); | |
1086 | wake_up(&host->wq); | |
9250aea7 UH |
1087 | pm_runtime_mark_last_busy(mmc_dev(host)); |
1088 | pm_runtime_put_autosuspend(mmc_dev(host)); | |
319a3f14 | 1089 | } |
8ea926b2 | 1090 | } |
1da177e4 LT |
1091 | EXPORT_SYMBOL(mmc_release_host); |
1092 | ||
e94cfef6 UH |
1093 | /* |
1094 | * This is a helper function, which fetches a runtime pm reference for the | |
1095 | * card device and also claims the host. | |
1096 | */ | |
1097 | void mmc_get_card(struct mmc_card *card) | |
1098 | { | |
1099 | pm_runtime_get_sync(&card->dev); | |
1100 | mmc_claim_host(card->host); | |
1101 | } | |
1102 | EXPORT_SYMBOL(mmc_get_card); | |
1103 | ||
1104 | /* | |
1105 | * This is a helper function, which releases the host and drops the runtime | |
1106 | * pm reference for the card device. | |
1107 | */ | |
1108 | void mmc_put_card(struct mmc_card *card) | |
1109 | { | |
1110 | mmc_release_host(card->host); | |
1111 | pm_runtime_mark_last_busy(&card->dev); | |
1112 | pm_runtime_put_autosuspend(&card->dev); | |
1113 | } | |
1114 | EXPORT_SYMBOL(mmc_put_card); | |
1115 | ||
7ea239d9 PO |
1116 | /* |
1117 | * Internal function that does the actual ios call to the host driver, | |
1118 | * optionally printing some debug output. | |
1119 | */ | |
920e70c5 RK |
1120 | static inline void mmc_set_ios(struct mmc_host *host) |
1121 | { | |
1122 | struct mmc_ios *ios = &host->ios; | |
1123 | ||
cd9277c0 PO |
1124 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
1125 | "width %u timing %u\n", | |
920e70c5 RK |
1126 | mmc_hostname(host), ios->clock, ios->bus_mode, |
1127 | ios->power_mode, ios->chip_select, ios->vdd, | |
ed9feec7 | 1128 | 1 << ios->bus_width, ios->timing); |
fba68bd2 | 1129 | |
920e70c5 RK |
1130 | host->ops->set_ios(host, ios); |
1131 | } | |
1132 | ||
7ea239d9 PO |
1133 | /* |
1134 | * Control chip select pin on a host. | |
1135 | */ | |
da7fbe58 | 1136 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 1137 | { |
da7fbe58 PO |
1138 | host->ios.chip_select = mode; |
1139 | mmc_set_ios(host); | |
1da177e4 LT |
1140 | } |
1141 | ||
7ea239d9 PO |
1142 | /* |
1143 | * Sets the host clock to the highest possible frequency that | |
1144 | * is below "hz". | |
1145 | */ | |
9eadcc05 | 1146 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 | 1147 | { |
6a98f1e8 | 1148 | WARN_ON(hz && hz < host->f_min); |
7ea239d9 PO |
1149 | |
1150 | if (hz > host->f_max) | |
1151 | hz = host->f_max; | |
1152 | ||
1153 | host->ios.clock = hz; | |
1154 | mmc_set_ios(host); | |
1155 | } | |
1156 | ||
63e415c6 AH |
1157 | int mmc_execute_tuning(struct mmc_card *card) |
1158 | { | |
1159 | struct mmc_host *host = card->host; | |
1160 | u32 opcode; | |
1161 | int err; | |
1162 | ||
1163 | if (!host->ops->execute_tuning) | |
1164 | return 0; | |
1165 | ||
1166 | if (mmc_card_mmc(card)) | |
1167 | opcode = MMC_SEND_TUNING_BLOCK_HS200; | |
1168 | else | |
1169 | opcode = MMC_SEND_TUNING_BLOCK; | |
1170 | ||
63e415c6 | 1171 | err = host->ops->execute_tuning(host, opcode); |
63e415c6 AH |
1172 | |
1173 | if (err) | |
07d97d87 RK |
1174 | pr_err("%s: tuning execution failed: %d\n", |
1175 | mmc_hostname(host), err); | |
79d5a65a AH |
1176 | else |
1177 | mmc_retune_enable(host); | |
63e415c6 AH |
1178 | |
1179 | return err; | |
1180 | } | |
1181 | ||
7ea239d9 PO |
1182 | /* |
1183 | * Change the bus mode (open drain/push-pull) of a host. | |
1184 | */ | |
1185 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
1186 | { | |
1187 | host->ios.bus_mode = mode; | |
1188 | mmc_set_ios(host); | |
1189 | } | |
1190 | ||
0f8d8ea6 AH |
1191 | /* |
1192 | * Change data bus width of a host. | |
1193 | */ | |
1194 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
1195 | { | |
4c4cb171 PR |
1196 | host->ios.bus_width = width; |
1197 | mmc_set_ios(host); | |
0f8d8ea6 AH |
1198 | } |
1199 | ||
2d079c43 JR |
1200 | /* |
1201 | * Set initial state after a power cycle or a hw_reset. | |
1202 | */ | |
1203 | void mmc_set_initial_state(struct mmc_host *host) | |
1204 | { | |
79d5a65a AH |
1205 | mmc_retune_disable(host); |
1206 | ||
2d079c43 JR |
1207 | if (mmc_host_is_spi(host)) |
1208 | host->ios.chip_select = MMC_CS_HIGH; | |
1209 | else | |
1210 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1211 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1212 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
1213 | host->ios.timing = MMC_TIMING_LEGACY; | |
75e8a228 | 1214 | host->ios.drv_type = 0; |
81ac2af6 SL |
1215 | host->ios.enhanced_strobe = false; |
1216 | ||
1217 | /* | |
1218 | * Make sure we are in non-enhanced strobe mode before we | |
1219 | * actually enable it in ext_csd. | |
1220 | */ | |
1221 | if ((host->caps2 & MMC_CAP2_HS400_ES) && | |
1222 | host->ops->hs400_enhanced_strobe) | |
1223 | host->ops->hs400_enhanced_strobe(host, &host->ios); | |
2d079c43 JR |
1224 | |
1225 | mmc_set_ios(host); | |
1226 | } | |
1227 | ||
86e8286a AV |
1228 | /** |
1229 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
1230 | * @vdd: voltage (mV) | |
1231 | * @low_bits: prefer low bits in boundary cases | |
1232 | * | |
1233 | * This function returns the OCR bit number according to the provided @vdd | |
1234 | * value. If conversion is not possible a negative errno value returned. | |
1235 | * | |
1236 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
1237 | * on boundary voltages. For example, | |
1238 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
1239 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
1240 | * | |
1241 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
1242 | */ | |
1243 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
1244 | { | |
1245 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1246 | int bit; | |
1247 | ||
1248 | if (vdd < 1650 || vdd > 3600) | |
1249 | return -EINVAL; | |
1250 | ||
1251 | if (vdd >= 1650 && vdd <= 1950) | |
1252 | return ilog2(MMC_VDD_165_195); | |
1253 | ||
1254 | if (low_bits) | |
1255 | vdd -= 1; | |
1256 | ||
1257 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1258 | bit = (vdd - 2000) / 100 + 8; | |
1259 | if (bit > max_bit) | |
1260 | return max_bit; | |
1261 | return bit; | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1266 | * @vdd_min: minimum voltage value (mV) | |
1267 | * @vdd_max: maximum voltage value (mV) | |
1268 | * | |
1269 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1270 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1271 | * | |
1272 | * Notes wrt boundary cases: | |
1273 | * This function sets the OCR bits for all boundary voltages, for example | |
1274 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1275 | * MMC_VDD_34_35 mask. | |
1276 | */ | |
1277 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1278 | { | |
1279 | u32 mask = 0; | |
1280 | ||
1281 | if (vdd_max < vdd_min) | |
1282 | return 0; | |
1283 | ||
1284 | /* Prefer high bits for the boundary vdd_max values. */ | |
1285 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1286 | if (vdd_max < 0) | |
1287 | return 0; | |
1288 | ||
1289 | /* Prefer low bits for the boundary vdd_min values. */ | |
1290 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1291 | if (vdd_min < 0) | |
1292 | return 0; | |
1293 | ||
1294 | /* Fill the mask, from max bit to min bit. */ | |
1295 | while (vdd_max >= vdd_min) | |
1296 | mask |= 1 << vdd_max--; | |
1297 | ||
1298 | return mask; | |
1299 | } | |
1300 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1301 | ||
6e9e318b HZ |
1302 | #ifdef CONFIG_OF |
1303 | ||
1304 | /** | |
1305 | * mmc_of_parse_voltage - return mask of supported voltages | |
1306 | * @np: The device node need to be parsed. | |
1307 | * @mask: mask of voltages available for MMC/SD/SDIO | |
1308 | * | |
cf925747 RK |
1309 | * Parse the "voltage-ranges" DT property, returning zero if it is not |
1310 | * found, negative errno if the voltage-range specification is invalid, | |
1311 | * or one if the voltage-range is specified and successfully parsed. | |
6e9e318b HZ |
1312 | */ |
1313 | int mmc_of_parse_voltage(struct device_node *np, u32 *mask) | |
1314 | { | |
1315 | const u32 *voltage_ranges; | |
1316 | int num_ranges, i; | |
1317 | ||
1318 | voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); | |
1319 | num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; | |
10a16a01 RK |
1320 | if (!voltage_ranges) { |
1321 | pr_debug("%s: voltage-ranges unspecified\n", np->full_name); | |
cf925747 | 1322 | return 0; |
10a16a01 RK |
1323 | } |
1324 | if (!num_ranges) { | |
1325 | pr_err("%s: voltage-ranges empty\n", np->full_name); | |
6e9e318b HZ |
1326 | return -EINVAL; |
1327 | } | |
1328 | ||
1329 | for (i = 0; i < num_ranges; i++) { | |
1330 | const int j = i * 2; | |
1331 | u32 ocr_mask; | |
1332 | ||
1333 | ocr_mask = mmc_vddrange_to_ocrmask( | |
1334 | be32_to_cpu(voltage_ranges[j]), | |
1335 | be32_to_cpu(voltage_ranges[j + 1])); | |
1336 | if (!ocr_mask) { | |
1337 | pr_err("%s: voltage-range #%d is invalid\n", | |
1338 | np->full_name, i); | |
1339 | return -EINVAL; | |
1340 | } | |
1341 | *mask |= ocr_mask; | |
1342 | } | |
1343 | ||
cf925747 | 1344 | return 1; |
6e9e318b HZ |
1345 | } |
1346 | EXPORT_SYMBOL(mmc_of_parse_voltage); | |
1347 | ||
1348 | #endif /* CONFIG_OF */ | |
1349 | ||
25185f3f SH |
1350 | static int mmc_of_get_func_num(struct device_node *node) |
1351 | { | |
1352 | u32 reg; | |
1353 | int ret; | |
1354 | ||
1355 | ret = of_property_read_u32(node, "reg", ®); | |
1356 | if (ret < 0) | |
1357 | return ret; | |
1358 | ||
1359 | return reg; | |
1360 | } | |
1361 | ||
1362 | struct device_node *mmc_of_find_child_device(struct mmc_host *host, | |
1363 | unsigned func_num) | |
1364 | { | |
1365 | struct device_node *node; | |
1366 | ||
1367 | if (!host->parent || !host->parent->of_node) | |
1368 | return NULL; | |
1369 | ||
1370 | for_each_child_of_node(host->parent->of_node, node) { | |
1371 | if (mmc_of_get_func_num(node) == func_num) | |
1372 | return node; | |
1373 | } | |
1374 | ||
1375 | return NULL; | |
1376 | } | |
1377 | ||
5c13941a DB |
1378 | #ifdef CONFIG_REGULATOR |
1379 | ||
310c805e HS |
1380 | /** |
1381 | * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage | |
1382 | * @vdd_bit: OCR bit number | |
1383 | * @min_uV: minimum voltage value (mV) | |
1384 | * @max_uV: maximum voltage value (mV) | |
1385 | * | |
1386 | * This function returns the voltage range according to the provided OCR | |
1387 | * bit number. If conversion is not possible a negative errno value returned. | |
1388 | */ | |
1389 | static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV) | |
1390 | { | |
1391 | int tmp; | |
1392 | ||
1393 | if (!vdd_bit) | |
1394 | return -EINVAL; | |
1395 | ||
1396 | /* | |
1397 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
1398 | * bits this regulator doesn't quite support ... don't | |
1399 | * be too picky, most cards and regulators are OK with | |
1400 | * a 0.1V range goof (it's a small error percentage). | |
1401 | */ | |
1402 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1403 | if (tmp == 0) { | |
1404 | *min_uV = 1650 * 1000; | |
1405 | *max_uV = 1950 * 1000; | |
1406 | } else { | |
1407 | *min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1408 | *max_uV = *min_uV + 100 * 1000; | |
1409 | } | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | ||
5c13941a DB |
1414 | /** |
1415 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1416 | * @supply: regulator to use | |
1417 | * | |
1418 | * This returns either a negative errno, or a mask of voltages that | |
1419 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1420 | * regulator. This would normally be called before registering the | |
1421 | * MMC host adapter. | |
1422 | */ | |
1423 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1424 | { | |
1425 | int result = 0; | |
1426 | int count; | |
1427 | int i; | |
9ed7ca89 JMC |
1428 | int vdd_uV; |
1429 | int vdd_mV; | |
5c13941a DB |
1430 | |
1431 | count = regulator_count_voltages(supply); | |
1432 | if (count < 0) | |
1433 | return count; | |
1434 | ||
1435 | for (i = 0; i < count; i++) { | |
5c13941a DB |
1436 | vdd_uV = regulator_list_voltage(supply, i); |
1437 | if (vdd_uV <= 0) | |
1438 | continue; | |
1439 | ||
1440 | vdd_mV = vdd_uV / 1000; | |
1441 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1442 | } | |
1443 | ||
9ed7ca89 JMC |
1444 | if (!result) { |
1445 | vdd_uV = regulator_get_voltage(supply); | |
1446 | if (vdd_uV <= 0) | |
1447 | return vdd_uV; | |
1448 | ||
1449 | vdd_mV = vdd_uV / 1000; | |
1450 | result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1451 | } | |
1452 | ||
5c13941a DB |
1453 | return result; |
1454 | } | |
45a6b32e | 1455 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1456 | |
1457 | /** | |
1458 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1459 | * @mmc: the host to regulate |
5c13941a | 1460 | * @supply: regulator to use |
99fc5131 | 1461 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1462 | * |
1463 | * Returns zero on success, else negative errno. | |
1464 | * | |
1465 | * MMC host drivers may use this to enable or disable a regulator using | |
1466 | * a particular supply voltage. This would normally be called from the | |
1467 | * set_ios() method. | |
1468 | */ | |
99fc5131 LW |
1469 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1470 | struct regulator *supply, | |
1471 | unsigned short vdd_bit) | |
5c13941a DB |
1472 | { |
1473 | int result = 0; | |
1474 | int min_uV, max_uV; | |
5c13941a DB |
1475 | |
1476 | if (vdd_bit) { | |
310c805e | 1477 | mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV); |
5c13941a | 1478 | |
ca6429d4 | 1479 | result = regulator_set_voltage(supply, min_uV, max_uV); |
99fc5131 | 1480 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1481 | result = regulator_enable(supply); |
99fc5131 LW |
1482 | if (!result) |
1483 | mmc->regulator_enabled = true; | |
1484 | } | |
1485 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1486 | result = regulator_disable(supply); |
99fc5131 LW |
1487 | if (result == 0) |
1488 | mmc->regulator_enabled = false; | |
5c13941a DB |
1489 | } |
1490 | ||
99fc5131 LW |
1491 | if (result) |
1492 | dev_err(mmc_dev(mmc), | |
1493 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1494 | return result; |
1495 | } | |
45a6b32e | 1496 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1497 | |
2086f801 DA |
1498 | static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator, |
1499 | int min_uV, int target_uV, | |
1500 | int max_uV) | |
1501 | { | |
1502 | /* | |
1503 | * Check if supported first to avoid errors since we may try several | |
1504 | * signal levels during power up and don't want to show errors. | |
1505 | */ | |
1506 | if (!regulator_is_supported_voltage(regulator, min_uV, max_uV)) | |
1507 | return -EINVAL; | |
1508 | ||
1509 | return regulator_set_voltage_triplet(regulator, min_uV, target_uV, | |
1510 | max_uV); | |
1511 | } | |
1512 | ||
1513 | /** | |
1514 | * mmc_regulator_set_vqmmc - Set VQMMC as per the ios | |
1515 | * | |
1516 | * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible. | |
1517 | * That will match the behavior of old boards where VQMMC and VMMC were supplied | |
1518 | * by the same supply. The Bus Operating conditions for 3.3V signaling in the | |
1519 | * SD card spec also define VQMMC in terms of VMMC. | |
1520 | * If this is not possible we'll try the full 2.7-3.6V of the spec. | |
1521 | * | |
1522 | * For 1.2V and 1.8V signaling we'll try to get as close as possible to the | |
1523 | * requested voltage. This is definitely a good idea for UHS where there's a | |
1524 | * separate regulator on the card that's trying to make 1.8V and it's best if | |
1525 | * we match. | |
1526 | * | |
1527 | * This function is expected to be used by a controller's | |
1528 | * start_signal_voltage_switch() function. | |
1529 | */ | |
1530 | int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios) | |
1531 | { | |
1532 | struct device *dev = mmc_dev(mmc); | |
1533 | int ret, volt, min_uV, max_uV; | |
1534 | ||
1535 | /* If no vqmmc supply then we can't change the voltage */ | |
1536 | if (IS_ERR(mmc->supply.vqmmc)) | |
1537 | return -EINVAL; | |
1538 | ||
1539 | switch (ios->signal_voltage) { | |
1540 | case MMC_SIGNAL_VOLTAGE_120: | |
1541 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1542 | 1100000, 1200000, 1300000); | |
1543 | case MMC_SIGNAL_VOLTAGE_180: | |
1544 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1545 | 1700000, 1800000, 1950000); | |
1546 | case MMC_SIGNAL_VOLTAGE_330: | |
1547 | ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV); | |
1548 | if (ret < 0) | |
1549 | return ret; | |
1550 | ||
1551 | dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n", | |
1552 | __func__, volt, max_uV); | |
1553 | ||
1554 | min_uV = max(volt - 300000, 2700000); | |
1555 | max_uV = min(max_uV + 200000, 3600000); | |
1556 | ||
1557 | /* | |
1558 | * Due to a limitation in the current implementation of | |
1559 | * regulator_set_voltage_triplet() which is taking the lowest | |
1560 | * voltage possible if below the target, search for a suitable | |
1561 | * voltage in two steps and try to stay close to vmmc | |
1562 | * with a 0.3V tolerance at first. | |
1563 | */ | |
1564 | if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1565 | min_uV, volt, max_uV)) | |
1566 | return 0; | |
1567 | ||
1568 | return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc, | |
1569 | 2700000, volt, 3600000); | |
1570 | default: | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | } | |
1574 | EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc); | |
1575 | ||
4d1f52f9 TK |
1576 | #endif /* CONFIG_REGULATOR */ |
1577 | ||
e137788d GL |
1578 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1579 | { | |
1580 | struct device *dev = mmc_dev(mmc); | |
e137788d GL |
1581 | int ret; |
1582 | ||
4d1f52f9 | 1583 | mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc"); |
bc35d5ed | 1584 | mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc"); |
e137788d | 1585 | |
4d1f52f9 TK |
1586 | if (IS_ERR(mmc->supply.vmmc)) { |
1587 | if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER) | |
1588 | return -EPROBE_DEFER; | |
6e1bbc51 | 1589 | dev_dbg(dev, "No vmmc regulator found\n"); |
4d1f52f9 TK |
1590 | } else { |
1591 | ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc); | |
1592 | if (ret > 0) | |
1593 | mmc->ocr_avail = ret; | |
1594 | else | |
1595 | dev_warn(dev, "Failed getting OCR mask: %d\n", ret); | |
1596 | } | |
e137788d | 1597 | |
4d1f52f9 TK |
1598 | if (IS_ERR(mmc->supply.vqmmc)) { |
1599 | if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER) | |
1600 | return -EPROBE_DEFER; | |
6e1bbc51 | 1601 | dev_dbg(dev, "No vqmmc regulator found\n"); |
4d1f52f9 | 1602 | } |
e137788d GL |
1603 | |
1604 | return 0; | |
1605 | } | |
1606 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1607 | ||
1da177e4 LT |
1608 | /* |
1609 | * Mask off any voltages we don't support and select | |
1610 | * the lowest voltage | |
1611 | */ | |
7ea239d9 | 1612 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1613 | { |
1614 | int bit; | |
1615 | ||
726d6f23 UH |
1616 | /* |
1617 | * Sanity check the voltages that the card claims to | |
1618 | * support. | |
1619 | */ | |
1620 | if (ocr & 0x7F) { | |
1621 | dev_warn(mmc_dev(host), | |
1622 | "card claims to support voltages below defined range\n"); | |
1623 | ocr &= ~0x7F; | |
1624 | } | |
1625 | ||
1da177e4 | 1626 | ocr &= host->ocr_avail; |
ce69d37b UH |
1627 | if (!ocr) { |
1628 | dev_warn(mmc_dev(host), "no support for card's volts\n"); | |
1629 | return 0; | |
1630 | } | |
1da177e4 | 1631 | |
ce69d37b UH |
1632 | if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) { |
1633 | bit = ffs(ocr) - 1; | |
63ef731a | 1634 | ocr &= 3 << bit; |
ce69d37b | 1635 | mmc_power_cycle(host, ocr); |
1da177e4 | 1636 | } else { |
ce69d37b UH |
1637 | bit = fls(ocr) - 1; |
1638 | ocr &= 3 << bit; | |
1639 | if (bit != host->ios.vdd) | |
1640 | dev_warn(mmc_dev(host), "exceeding card's volts\n"); | |
1da177e4 LT |
1641 | } |
1642 | ||
1643 | return ocr; | |
1644 | } | |
1645 | ||
4e74b6b3 | 1646 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) |
567c8903 JR |
1647 | { |
1648 | int err = 0; | |
1649 | int old_signal_voltage = host->ios.signal_voltage; | |
1650 | ||
1651 | host->ios.signal_voltage = signal_voltage; | |
9eadcc05 | 1652 | if (host->ops->start_signal_voltage_switch) |
567c8903 | 1653 | err = host->ops->start_signal_voltage_switch(host, &host->ios); |
567c8903 JR |
1654 | |
1655 | if (err) | |
1656 | host->ios.signal_voltage = old_signal_voltage; | |
1657 | ||
1658 | return err; | |
1659 | ||
1660 | } | |
1661 | ||
2ed573b6 | 1662 | int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr) |
f2119df6 | 1663 | { |
c7836d15 | 1664 | struct mmc_command cmd = {}; |
f2119df6 | 1665 | int err = 0; |
0797e5f1 | 1666 | u32 clock; |
f2119df6 | 1667 | |
0797e5f1 JR |
1668 | /* |
1669 | * If we cannot switch voltages, return failure so the caller | |
1670 | * can continue without UHS mode | |
1671 | */ | |
1672 | if (!host->ops->start_signal_voltage_switch) | |
1673 | return -EPERM; | |
1674 | if (!host->ops->card_busy) | |
6606110d JP |
1675 | pr_warn("%s: cannot verify signal voltage switch\n", |
1676 | mmc_hostname(host)); | |
0797e5f1 JR |
1677 | |
1678 | cmd.opcode = SD_SWITCH_VOLTAGE; | |
1679 | cmd.arg = 0; | |
1680 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1681 | ||
1682 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1683 | if (err) | |
9eadcc05 UH |
1684 | return err; |
1685 | ||
1686 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1687 | return -EIO; | |
0797e5f1 | 1688 | |
0797e5f1 JR |
1689 | /* |
1690 | * The card should drive cmd and dat[0:3] low immediately | |
1691 | * after the response of cmd11, but wait 1 ms to be sure | |
1692 | */ | |
1693 | mmc_delay(1); | |
1694 | if (host->ops->card_busy && !host->ops->card_busy(host)) { | |
1695 | err = -EAGAIN; | |
1696 | goto power_cycle; | |
1697 | } | |
1698 | /* | |
1699 | * During a signal voltage level switch, the clock must be gated | |
1700 | * for 5 ms according to the SD spec | |
1701 | */ | |
1702 | clock = host->ios.clock; | |
1703 | host->ios.clock = 0; | |
1704 | mmc_set_ios(host); | |
f2119df6 | 1705 | |
4e74b6b3 | 1706 | if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180)) { |
0797e5f1 JR |
1707 | /* |
1708 | * Voltages may not have been switched, but we've already | |
1709 | * sent CMD11, so a power cycle is required anyway | |
1710 | */ | |
1711 | err = -EAGAIN; | |
1712 | goto power_cycle; | |
f2119df6 AN |
1713 | } |
1714 | ||
7c5209c3 DA |
1715 | /* Keep clock gated for at least 10 ms, though spec only says 5 ms */ |
1716 | mmc_delay(10); | |
0797e5f1 JR |
1717 | host->ios.clock = clock; |
1718 | mmc_set_ios(host); | |
1719 | ||
1720 | /* Wait for at least 1 ms according to spec */ | |
1721 | mmc_delay(1); | |
1722 | ||
1723 | /* | |
1724 | * Failure to switch is indicated by the card holding | |
1725 | * dat[0:3] low | |
1726 | */ | |
1727 | if (host->ops->card_busy && host->ops->card_busy(host)) | |
1728 | err = -EAGAIN; | |
1729 | ||
1730 | power_cycle: | |
1731 | if (err) { | |
1732 | pr_debug("%s: Signal voltage switch failed, " | |
1733 | "power cycling card\n", mmc_hostname(host)); | |
0f791fda | 1734 | mmc_power_cycle(host, ocr); |
0797e5f1 JR |
1735 | } |
1736 | ||
0797e5f1 | 1737 | return err; |
f2119df6 AN |
1738 | } |
1739 | ||
b57c43ad | 1740 | /* |
7ea239d9 | 1741 | * Select timing parameters for host. |
b57c43ad | 1742 | */ |
7ea239d9 | 1743 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1744 | { |
7ea239d9 PO |
1745 | host->ios.timing = timing; |
1746 | mmc_set_ios(host); | |
b57c43ad PO |
1747 | } |
1748 | ||
d6d50a15 AN |
1749 | /* |
1750 | * Select appropriate driver type for host. | |
1751 | */ | |
1752 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1753 | { | |
1754 | host->ios.drv_type = drv_type; | |
1755 | mmc_set_ios(host); | |
1756 | } | |
1757 | ||
e23350b3 AH |
1758 | int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr, |
1759 | int card_drv_type, int *drv_type) | |
1760 | { | |
1761 | struct mmc_host *host = card->host; | |
1762 | int host_drv_type = SD_DRIVER_TYPE_B; | |
e23350b3 AH |
1763 | |
1764 | *drv_type = 0; | |
1765 | ||
1766 | if (!host->ops->select_drive_strength) | |
1767 | return 0; | |
1768 | ||
1769 | /* Use SD definition of driver strength for hosts */ | |
1770 | if (host->caps & MMC_CAP_DRIVER_TYPE_A) | |
1771 | host_drv_type |= SD_DRIVER_TYPE_A; | |
1772 | ||
1773 | if (host->caps & MMC_CAP_DRIVER_TYPE_C) | |
1774 | host_drv_type |= SD_DRIVER_TYPE_C; | |
1775 | ||
1776 | if (host->caps & MMC_CAP_DRIVER_TYPE_D) | |
1777 | host_drv_type |= SD_DRIVER_TYPE_D; | |
1778 | ||
1779 | /* | |
1780 | * The drive strength that the hardware can support | |
1781 | * depends on the board design. Pass the appropriate | |
1782 | * information and let the hardware specific code | |
1783 | * return what is possible given the options | |
1784 | */ | |
9eadcc05 UH |
1785 | return host->ops->select_drive_strength(card, max_dtr, |
1786 | host_drv_type, | |
1787 | card_drv_type, | |
1788 | drv_type); | |
e23350b3 AH |
1789 | } |
1790 | ||
1da177e4 | 1791 | /* |
45f8245b RK |
1792 | * Apply power to the MMC stack. This is a two-stage process. |
1793 | * First, we enable power to the card without the clock running. | |
1794 | * We then wait a bit for the power to stabilise. Finally, | |
1795 | * enable the bus drivers and clock to the card. | |
1796 | * | |
1797 | * We must _NOT_ enable the clock prior to power stablising. | |
1798 | * | |
1799 | * If a host does all the power sequencing itself, ignore the | |
1800 | * initial MMC_POWER_UP stage. | |
1da177e4 | 1801 | */ |
4a065193 | 1802 | void mmc_power_up(struct mmc_host *host, u32 ocr) |
1da177e4 | 1803 | { |
fa550189 UH |
1804 | if (host->ios.power_mode == MMC_POWER_ON) |
1805 | return; | |
1806 | ||
3aa8793f UH |
1807 | mmc_pwrseq_pre_power_on(host); |
1808 | ||
4a065193 | 1809 | host->ios.vdd = fls(ocr) - 1; |
1da177e4 | 1810 | host->ios.power_mode = MMC_POWER_UP; |
2d079c43 JR |
1811 | /* Set initial state and call mmc_set_ios */ |
1812 | mmc_set_initial_state(host); | |
1da177e4 | 1813 | |
ceae98f2 | 1814 | /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */ |
4e74b6b3 | 1815 | if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330)) |
ceae98f2 | 1816 | dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n"); |
4e74b6b3 | 1817 | else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180)) |
ceae98f2 | 1818 | dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n"); |
4e74b6b3 | 1819 | else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120)) |
ceae98f2 | 1820 | dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n"); |
108ecc4c | 1821 | |
f9996aee PO |
1822 | /* |
1823 | * This delay should be sufficient to allow the power supply | |
1824 | * to reach the minimum voltage. | |
1825 | */ | |
79bccc5a | 1826 | mmc_delay(10); |
1da177e4 | 1827 | |
4febb7e2 UH |
1828 | mmc_pwrseq_post_power_on(host); |
1829 | ||
88ae8b86 | 1830 | host->ios.clock = host->f_init; |
8dfd0374 | 1831 | |
1da177e4 | 1832 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1833 | mmc_set_ios(host); |
1da177e4 | 1834 | |
f9996aee PO |
1835 | /* |
1836 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1837 | * time required to reach a stable voltage. | |
1838 | */ | |
79bccc5a | 1839 | mmc_delay(10); |
1da177e4 LT |
1840 | } |
1841 | ||
7f7e4129 | 1842 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1843 | { |
fa550189 UH |
1844 | if (host->ios.power_mode == MMC_POWER_OFF) |
1845 | return; | |
1846 | ||
3aa8793f UH |
1847 | mmc_pwrseq_power_off(host); |
1848 | ||
1da177e4 LT |
1849 | host->ios.clock = 0; |
1850 | host->ios.vdd = 0; | |
b33d46c3 | 1851 | |
1da177e4 | 1852 | host->ios.power_mode = MMC_POWER_OFF; |
2d079c43 JR |
1853 | /* Set initial state and call mmc_set_ios */ |
1854 | mmc_set_initial_state(host); | |
778e277c | 1855 | |
041beb1d DD |
1856 | /* |
1857 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1858 | * XO-1.5, require a short delay after poweroff before the card | |
1859 | * can be successfully turned on again. | |
1860 | */ | |
1861 | mmc_delay(1); | |
1da177e4 LT |
1862 | } |
1863 | ||
4a065193 | 1864 | void mmc_power_cycle(struct mmc_host *host, u32 ocr) |
276e090f JR |
1865 | { |
1866 | mmc_power_off(host); | |
1867 | /* Wait at least 1 ms according to SD spec */ | |
1868 | mmc_delay(1); | |
4a065193 | 1869 | mmc_power_up(host, ocr); |
276e090f JR |
1870 | } |
1871 | ||
39361851 AB |
1872 | /* |
1873 | * Cleanup when the last reference to the bus operator is dropped. | |
1874 | */ | |
261172fd | 1875 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 | 1876 | { |
6ff897ff | 1877 | WARN_ON(!host->bus_dead); |
39361851 AB |
1878 | |
1879 | host->bus_ops = NULL; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Increase reference count of bus operator | |
1884 | */ | |
1885 | static inline void mmc_bus_get(struct mmc_host *host) | |
1886 | { | |
1887 | unsigned long flags; | |
1888 | ||
1889 | spin_lock_irqsave(&host->lock, flags); | |
1890 | host->bus_refs++; | |
1891 | spin_unlock_irqrestore(&host->lock, flags); | |
1892 | } | |
1893 | ||
1894 | /* | |
1895 | * Decrease reference count of bus operator and free it if | |
1896 | * it is the last reference. | |
1897 | */ | |
1898 | static inline void mmc_bus_put(struct mmc_host *host) | |
1899 | { | |
1900 | unsigned long flags; | |
1901 | ||
1902 | spin_lock_irqsave(&host->lock, flags); | |
1903 | host->bus_refs--; | |
1904 | if ((host->bus_refs == 0) && host->bus_ops) | |
1905 | __mmc_release_bus(host); | |
1906 | spin_unlock_irqrestore(&host->lock, flags); | |
1907 | } | |
1908 | ||
1da177e4 | 1909 | /* |
7ea239d9 PO |
1910 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1911 | * host at any given time. | |
1da177e4 | 1912 | */ |
7ea239d9 | 1913 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1914 | { |
7ea239d9 | 1915 | unsigned long flags; |
e45a1bd2 | 1916 | |
d84075c8 | 1917 | WARN_ON(!host->claimed); |
bce40a36 | 1918 | |
7ea239d9 | 1919 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1920 | |
6ff897ff SL |
1921 | WARN_ON(host->bus_ops); |
1922 | WARN_ON(host->bus_refs); | |
b57c43ad | 1923 | |
7ea239d9 PO |
1924 | host->bus_ops = ops; |
1925 | host->bus_refs = 1; | |
1926 | host->bus_dead = 0; | |
b57c43ad | 1927 | |
7ea239d9 | 1928 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1929 | } |
1930 | ||
7ea239d9 | 1931 | /* |
7f7e4129 | 1932 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1933 | */ |
1934 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1935 | { |
7ea239d9 | 1936 | unsigned long flags; |
7ccd266e | 1937 | |
d84075c8 PO |
1938 | WARN_ON(!host->claimed); |
1939 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1940 | |
7ea239d9 | 1941 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1942 | |
7ea239d9 | 1943 | host->bus_dead = 1; |
7ccd266e | 1944 | |
7ea239d9 | 1945 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1946 | |
7ea239d9 | 1947 | mmc_bus_put(host); |
1da177e4 LT |
1948 | } |
1949 | ||
bbd43682 UH |
1950 | static void _mmc_detect_change(struct mmc_host *host, unsigned long delay, |
1951 | bool cd_irq) | |
1952 | { | |
1953 | #ifdef CONFIG_MMC_DEBUG | |
1954 | unsigned long flags; | |
1955 | spin_lock_irqsave(&host->lock, flags); | |
1956 | WARN_ON(host->removed); | |
1957 | spin_unlock_irqrestore(&host->lock, flags); | |
1958 | #endif | |
1959 | ||
1960 | /* | |
1961 | * If the device is configured as wakeup, we prevent a new sleep for | |
1962 | * 5 s to give provision for user space to consume the event. | |
1963 | */ | |
1964 | if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) && | |
1965 | device_can_wakeup(mmc_dev(host))) | |
1966 | pm_wakeup_event(mmc_dev(host), 5000); | |
1967 | ||
1968 | host->detect_change = 1; | |
1969 | mmc_schedule_delayed_work(&host->detect, delay); | |
1970 | } | |
1971 | ||
1da177e4 LT |
1972 | /** |
1973 | * mmc_detect_change - process change of state on a MMC socket | |
1974 | * @host: host which changed state. | |
8dc00335 | 1975 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1976 | * |
67a61c48 PO |
1977 | * MMC drivers should call this when they detect a card has been |
1978 | * inserted or removed. The MMC layer will confirm that any | |
1979 | * present card is still functional, and initialize any newly | |
1980 | * inserted. | |
1da177e4 | 1981 | */ |
8dc00335 | 1982 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1983 | { |
bbd43682 | 1984 | _mmc_detect_change(host, delay, true); |
1da177e4 | 1985 | } |
1da177e4 LT |
1986 | EXPORT_SYMBOL(mmc_detect_change); |
1987 | ||
dfe86cba AH |
1988 | void mmc_init_erase(struct mmc_card *card) |
1989 | { | |
1990 | unsigned int sz; | |
1991 | ||
1992 | if (is_power_of_2(card->erase_size)) | |
1993 | card->erase_shift = ffs(card->erase_size) - 1; | |
1994 | else | |
1995 | card->erase_shift = 0; | |
1996 | ||
1997 | /* | |
1998 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1999 | * card. That is not desirable because it can take a long time | |
2000 | * (minutes) potentially delaying more important I/O, and also the | |
2001 | * timeout calculations become increasingly hugely over-estimated. | |
2002 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
2003 | * to that size and alignment. | |
2004 | * | |
2005 | * For SD cards that define Allocation Unit size, limit erases to one | |
c6d8fd61 GG |
2006 | * Allocation Unit at a time. |
2007 | * For MMC, have a stab at ai good value and for modern cards it will | |
2008 | * end up being 4MiB. Note that if the value is too small, it can end | |
2009 | * up taking longer to erase. Also note, erase_size is already set to | |
2010 | * High Capacity Erase Size if available when this function is called. | |
dfe86cba AH |
2011 | */ |
2012 | if (mmc_card_sd(card) && card->ssr.au) { | |
2013 | card->pref_erase = card->ssr.au; | |
2014 | card->erase_shift = ffs(card->ssr.au) - 1; | |
cc8aa7de | 2015 | } else if (card->erase_size) { |
dfe86cba AH |
2016 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; |
2017 | if (sz < 128) | |
2018 | card->pref_erase = 512 * 1024 / 512; | |
2019 | else if (sz < 512) | |
2020 | card->pref_erase = 1024 * 1024 / 512; | |
2021 | else if (sz < 1024) | |
2022 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
2023 | else | |
2024 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
2025 | if (card->pref_erase < card->erase_size) | |
2026 | card->pref_erase = card->erase_size; | |
2027 | else { | |
2028 | sz = card->pref_erase % card->erase_size; | |
2029 | if (sz) | |
2030 | card->pref_erase += card->erase_size - sz; | |
2031 | } | |
cc8aa7de CD |
2032 | } else |
2033 | card->pref_erase = 0; | |
dfe86cba AH |
2034 | } |
2035 | ||
eaa02f75 AW |
2036 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
2037 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
2038 | { |
2039 | unsigned int erase_timeout; | |
2040 | ||
7194efb8 AH |
2041 | if (arg == MMC_DISCARD_ARG || |
2042 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
2043 | erase_timeout = card->ext_csd.trim_timeout; | |
2044 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
2045 | /* High Capacity Erase Group Size uses HC timeouts */ |
2046 | if (arg == MMC_TRIM_ARG) | |
2047 | erase_timeout = card->ext_csd.trim_timeout; | |
2048 | else | |
2049 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
2050 | } else { | |
2051 | /* CSD Erase Group Size uses write timeout */ | |
2052 | unsigned int mult = (10 << card->csd.r2w_factor); | |
2053 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
2054 | unsigned int timeout_us; | |
2055 | ||
2056 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
2057 | if (card->csd.tacc_ns < 1000000) | |
2058 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
2059 | else | |
2060 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
2061 | ||
2062 | /* | |
2063 | * ios.clock is only a target. The real clock rate might be | |
2064 | * less but not that much less, so fudge it by multiplying by 2. | |
2065 | */ | |
2066 | timeout_clks <<= 1; | |
2067 | timeout_us += (timeout_clks * 1000) / | |
9eadcc05 | 2068 | (card->host->ios.clock / 1000); |
dfe86cba AH |
2069 | |
2070 | erase_timeout = timeout_us / 1000; | |
2071 | ||
2072 | /* | |
2073 | * Theoretically, the calculation could underflow so round up | |
2074 | * to 1ms in that case. | |
2075 | */ | |
2076 | if (!erase_timeout) | |
2077 | erase_timeout = 1; | |
2078 | } | |
2079 | ||
2080 | /* Multiplier for secure operations */ | |
2081 | if (arg & MMC_SECURE_ARGS) { | |
2082 | if (arg == MMC_SECURE_ERASE_ARG) | |
2083 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
2084 | else | |
2085 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
2086 | } | |
2087 | ||
2088 | erase_timeout *= qty; | |
2089 | ||
2090 | /* | |
2091 | * Ensure at least a 1 second timeout for SPI as per | |
2092 | * 'mmc_set_data_timeout()' | |
2093 | */ | |
2094 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
2095 | erase_timeout = 1000; | |
2096 | ||
eaa02f75 | 2097 | return erase_timeout; |
dfe86cba AH |
2098 | } |
2099 | ||
eaa02f75 AW |
2100 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
2101 | unsigned int arg, | |
2102 | unsigned int qty) | |
dfe86cba | 2103 | { |
eaa02f75 AW |
2104 | unsigned int erase_timeout; |
2105 | ||
dfe86cba AH |
2106 | if (card->ssr.erase_timeout) { |
2107 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
2108 | erase_timeout = card->ssr.erase_timeout * qty + |
2109 | card->ssr.erase_offset; | |
dfe86cba AH |
2110 | } else { |
2111 | /* | |
2112 | * Erase timeout not specified in SD Status Register (SSR) so | |
2113 | * use 250ms per write block. | |
2114 | */ | |
eaa02f75 | 2115 | erase_timeout = 250 * qty; |
dfe86cba AH |
2116 | } |
2117 | ||
2118 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
2119 | if (erase_timeout < 1000) |
2120 | erase_timeout = 1000; | |
2121 | ||
2122 | return erase_timeout; | |
dfe86cba AH |
2123 | } |
2124 | ||
eaa02f75 AW |
2125 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
2126 | unsigned int arg, | |
2127 | unsigned int qty) | |
dfe86cba AH |
2128 | { |
2129 | if (mmc_card_sd(card)) | |
eaa02f75 | 2130 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 2131 | else |
eaa02f75 | 2132 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
2133 | } |
2134 | ||
2135 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
2136 | unsigned int to, unsigned int arg) | |
2137 | { | |
c7836d15 | 2138 | struct mmc_command cmd = {}; |
bb4eecf2 BW |
2139 | unsigned int qty = 0, busy_timeout = 0; |
2140 | bool use_r1b_resp = false; | |
8fee476b | 2141 | unsigned long timeout; |
dfe86cba AH |
2142 | int err; |
2143 | ||
8f11d106 AH |
2144 | mmc_retune_hold(card->host); |
2145 | ||
dfe86cba AH |
2146 | /* |
2147 | * qty is used to calculate the erase timeout which depends on how many | |
2148 | * erase groups (or allocation units in SD terminology) are affected. | |
2149 | * We count erasing part of an erase group as one erase group. | |
2150 | * For SD, the allocation units are always a power of 2. For MMC, the | |
2151 | * erase group size is almost certainly also power of 2, but it does not | |
2152 | * seem to insist on that in the JEDEC standard, so we fall back to | |
2153 | * division in that case. SD may not specify an allocation unit size, | |
2154 | * in which case the timeout is based on the number of write blocks. | |
2155 | * | |
2156 | * Note that the timeout for secure trim 2 will only be correct if the | |
2157 | * number of erase groups specified is the same as the total of all | |
2158 | * preceding secure trim 1 commands. Since the power may have been | |
2159 | * lost since the secure trim 1 commands occurred, it is generally | |
2160 | * impossible to calculate the secure trim 2 timeout correctly. | |
2161 | */ | |
2162 | if (card->erase_shift) | |
2163 | qty += ((to >> card->erase_shift) - | |
2164 | (from >> card->erase_shift)) + 1; | |
2165 | else if (mmc_card_sd(card)) | |
2166 | qty += to - from + 1; | |
2167 | else | |
2168 | qty += ((to / card->erase_size) - | |
2169 | (from / card->erase_size)) + 1; | |
2170 | ||
2171 | if (!mmc_card_blockaddr(card)) { | |
2172 | from <<= 9; | |
2173 | to <<= 9; | |
2174 | } | |
2175 | ||
dfe86cba AH |
2176 | if (mmc_card_sd(card)) |
2177 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
2178 | else | |
2179 | cmd.opcode = MMC_ERASE_GROUP_START; | |
2180 | cmd.arg = from; | |
2181 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2182 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2183 | if (err) { | |
a3c76eb9 | 2184 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 2185 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 2186 | err = -EIO; |
dfe86cba AH |
2187 | goto out; |
2188 | } | |
2189 | ||
2190 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2191 | if (mmc_card_sd(card)) | |
2192 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
2193 | else | |
2194 | cmd.opcode = MMC_ERASE_GROUP_END; | |
2195 | cmd.arg = to; | |
2196 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2197 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2198 | if (err) { | |
a3c76eb9 | 2199 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 2200 | err, cmd.resp[0]); |
67716327 | 2201 | err = -EIO; |
dfe86cba AH |
2202 | goto out; |
2203 | } | |
2204 | ||
2205 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2206 | cmd.opcode = MMC_ERASE; | |
2207 | cmd.arg = arg; | |
bb4eecf2 BW |
2208 | busy_timeout = mmc_erase_timeout(card, arg, qty); |
2209 | /* | |
2210 | * If the host controller supports busy signalling and the timeout for | |
2211 | * the erase operation does not exceed the max_busy_timeout, we should | |
2212 | * use R1B response. Or we need to prevent the host from doing hw busy | |
2213 | * detection, which is done by converting to a R1 response instead. | |
2214 | */ | |
2215 | if (card->host->max_busy_timeout && | |
2216 | busy_timeout > card->host->max_busy_timeout) { | |
2217 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2218 | } else { | |
2219 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
2220 | cmd.busy_timeout = busy_timeout; | |
2221 | use_r1b_resp = true; | |
2222 | } | |
2223 | ||
dfe86cba AH |
2224 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
2225 | if (err) { | |
a3c76eb9 | 2226 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
2227 | err, cmd.resp[0]); |
2228 | err = -EIO; | |
2229 | goto out; | |
2230 | } | |
2231 | ||
2232 | if (mmc_host_is_spi(card->host)) | |
2233 | goto out; | |
2234 | ||
bb4eecf2 BW |
2235 | /* |
2236 | * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling | |
2237 | * shall be avoided. | |
2238 | */ | |
2239 | if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) | |
2240 | goto out; | |
2241 | ||
2242 | timeout = jiffies + msecs_to_jiffies(busy_timeout); | |
dfe86cba AH |
2243 | do { |
2244 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
2245 | cmd.opcode = MMC_SEND_STATUS; | |
2246 | cmd.arg = card->rca << 16; | |
2247 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
2248 | /* Do not retry else we can't see errors */ | |
2249 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2250 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 2251 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
2252 | err, cmd.resp[0]); |
2253 | err = -EIO; | |
2254 | goto out; | |
2255 | } | |
8fee476b TR |
2256 | |
2257 | /* Timeout if the device never becomes ready for data and | |
2258 | * never leaves the program state. | |
2259 | */ | |
2260 | if (time_after(jiffies, timeout)) { | |
2261 | pr_err("%s: Card stuck in programming state! %s\n", | |
2262 | mmc_hostname(card->host), __func__); | |
2263 | err = -EIO; | |
2264 | goto out; | |
2265 | } | |
2266 | ||
dfe86cba | 2267 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || |
8fee476b | 2268 | (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)); |
dfe86cba | 2269 | out: |
8f11d106 | 2270 | mmc_retune_release(card->host); |
dfe86cba AH |
2271 | return err; |
2272 | } | |
2273 | ||
71085123 BW |
2274 | static unsigned int mmc_align_erase_size(struct mmc_card *card, |
2275 | unsigned int *from, | |
2276 | unsigned int *to, | |
2277 | unsigned int nr) | |
2278 | { | |
2279 | unsigned int from_new = *from, nr_new = nr, rem; | |
2280 | ||
6c689886 BW |
2281 | /* |
2282 | * When the 'card->erase_size' is power of 2, we can use round_up/down() | |
2283 | * to align the erase size efficiently. | |
2284 | */ | |
2285 | if (is_power_of_2(card->erase_size)) { | |
2286 | unsigned int temp = from_new; | |
2287 | ||
2288 | from_new = round_up(temp, card->erase_size); | |
2289 | rem = from_new - temp; | |
2290 | ||
71085123 BW |
2291 | if (nr_new > rem) |
2292 | nr_new -= rem; | |
2293 | else | |
2294 | return 0; | |
71085123 | 2295 | |
6c689886 BW |
2296 | nr_new = round_down(nr_new, card->erase_size); |
2297 | } else { | |
2298 | rem = from_new % card->erase_size; | |
2299 | if (rem) { | |
2300 | rem = card->erase_size - rem; | |
2301 | from_new += rem; | |
2302 | if (nr_new > rem) | |
2303 | nr_new -= rem; | |
2304 | else | |
2305 | return 0; | |
2306 | } | |
2307 | ||
2308 | rem = nr_new % card->erase_size; | |
2309 | if (rem) | |
2310 | nr_new -= rem; | |
2311 | } | |
71085123 BW |
2312 | |
2313 | if (nr_new == 0) | |
2314 | return 0; | |
2315 | ||
2316 | *to = from_new + nr_new; | |
2317 | *from = from_new; | |
2318 | ||
2319 | return nr_new; | |
2320 | } | |
2321 | ||
dfe86cba AH |
2322 | /** |
2323 | * mmc_erase - erase sectors. | |
2324 | * @card: card to erase | |
2325 | * @from: first sector to erase | |
2326 | * @nr: number of sectors to erase | |
2327 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
2328 | * | |
2329 | * Caller must claim host before calling this function. | |
2330 | */ | |
2331 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
2332 | unsigned int arg) | |
2333 | { | |
2334 | unsigned int rem, to = from + nr; | |
642c28ab | 2335 | int err; |
dfe86cba AH |
2336 | |
2337 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
2338 | !(card->csd.cmdclass & CCC_ERASE)) | |
2339 | return -EOPNOTSUPP; | |
2340 | ||
2341 | if (!card->erase_size) | |
2342 | return -EOPNOTSUPP; | |
2343 | ||
2344 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
2345 | return -EOPNOTSUPP; | |
2346 | ||
2347 | if ((arg & MMC_SECURE_ARGS) && | |
2348 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
2349 | return -EOPNOTSUPP; | |
2350 | ||
2351 | if ((arg & MMC_TRIM_ARGS) && | |
2352 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
2353 | return -EOPNOTSUPP; | |
2354 | ||
2355 | if (arg == MMC_SECURE_ERASE_ARG) { | |
2356 | if (from % card->erase_size || nr % card->erase_size) | |
2357 | return -EINVAL; | |
2358 | } | |
2359 | ||
71085123 BW |
2360 | if (arg == MMC_ERASE_ARG) |
2361 | nr = mmc_align_erase_size(card, &from, &to, nr); | |
dfe86cba AH |
2362 | |
2363 | if (nr == 0) | |
2364 | return 0; | |
2365 | ||
dfe86cba AH |
2366 | if (to <= from) |
2367 | return -EINVAL; | |
2368 | ||
2369 | /* 'from' and 'to' are inclusive */ | |
2370 | to -= 1; | |
2371 | ||
642c28ab DJ |
2372 | /* |
2373 | * Special case where only one erase-group fits in the timeout budget: | |
2374 | * If the region crosses an erase-group boundary on this particular | |
2375 | * case, we will be trimming more than one erase-group which, does not | |
2376 | * fit in the timeout budget of the controller, so we need to split it | |
2377 | * and call mmc_do_erase() twice if necessary. This special case is | |
2378 | * identified by the card->eg_boundary flag. | |
2379 | */ | |
22d7e85f RG |
2380 | rem = card->erase_size - (from % card->erase_size); |
2381 | if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) { | |
642c28ab DJ |
2382 | err = mmc_do_erase(card, from, from + rem - 1, arg); |
2383 | from += rem; | |
2384 | if ((err) || (to <= from)) | |
2385 | return err; | |
2386 | } | |
2387 | ||
dfe86cba AH |
2388 | return mmc_do_erase(card, from, to, arg); |
2389 | } | |
2390 | EXPORT_SYMBOL(mmc_erase); | |
2391 | ||
2392 | int mmc_can_erase(struct mmc_card *card) | |
2393 | { | |
2394 | if ((card->host->caps & MMC_CAP_ERASE) && | |
2395 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
2396 | return 1; | |
2397 | return 0; | |
2398 | } | |
2399 | EXPORT_SYMBOL(mmc_can_erase); | |
2400 | ||
2401 | int mmc_can_trim(struct mmc_card *card) | |
2402 | { | |
b5b4ff0a SL |
2403 | if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) && |
2404 | (!(card->quirks & MMC_QUIRK_TRIM_BROKEN))) | |
dfe86cba AH |
2405 | return 1; |
2406 | return 0; | |
2407 | } | |
2408 | EXPORT_SYMBOL(mmc_can_trim); | |
2409 | ||
b3bf9153 KP |
2410 | int mmc_can_discard(struct mmc_card *card) |
2411 | { | |
2412 | /* | |
2413 | * As there's no way to detect the discard support bit at v4.5 | |
2414 | * use the s/w feature support filed. | |
2415 | */ | |
2416 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
2417 | return 1; | |
2418 | return 0; | |
2419 | } | |
2420 | EXPORT_SYMBOL(mmc_can_discard); | |
2421 | ||
d9ddd629 KP |
2422 | int mmc_can_sanitize(struct mmc_card *card) |
2423 | { | |
28302812 AH |
2424 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
2425 | return 0; | |
d9ddd629 KP |
2426 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
2427 | return 1; | |
2428 | return 0; | |
2429 | } | |
2430 | EXPORT_SYMBOL(mmc_can_sanitize); | |
2431 | ||
dfe86cba AH |
2432 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
2433 | { | |
5204d00f LC |
2434 | if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) && |
2435 | !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN)) | |
dfe86cba AH |
2436 | return 1; |
2437 | return 0; | |
2438 | } | |
2439 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
2440 | ||
2441 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
2442 | unsigned int nr) | |
2443 | { | |
2444 | if (!card->erase_size) | |
2445 | return 0; | |
2446 | if (from % card->erase_size || nr % card->erase_size) | |
2447 | return 0; | |
2448 | return 1; | |
2449 | } | |
2450 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 2451 | |
e056a1b5 AH |
2452 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
2453 | unsigned int arg) | |
2454 | { | |
2455 | struct mmc_host *host = card->host; | |
bb4eecf2 | 2456 | unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout; |
e056a1b5 | 2457 | unsigned int last_timeout = 0; |
12182aff UH |
2458 | unsigned int max_busy_timeout = host->max_busy_timeout ? |
2459 | host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS; | |
e056a1b5 | 2460 | |
bb4eecf2 | 2461 | if (card->erase_shift) { |
e056a1b5 | 2462 | max_qty = UINT_MAX >> card->erase_shift; |
bb4eecf2 BW |
2463 | min_qty = card->pref_erase >> card->erase_shift; |
2464 | } else if (mmc_card_sd(card)) { | |
e056a1b5 | 2465 | max_qty = UINT_MAX; |
bb4eecf2 BW |
2466 | min_qty = card->pref_erase; |
2467 | } else { | |
e056a1b5 | 2468 | max_qty = UINT_MAX / card->erase_size; |
bb4eecf2 BW |
2469 | min_qty = card->pref_erase / card->erase_size; |
2470 | } | |
e056a1b5 | 2471 | |
bb4eecf2 BW |
2472 | /* |
2473 | * We should not only use 'host->max_busy_timeout' as the limitation | |
2474 | * when deciding the max discard sectors. We should set a balance value | |
2475 | * to improve the erase speed, and it can not get too long timeout at | |
2476 | * the same time. | |
2477 | * | |
2478 | * Here we set 'card->pref_erase' as the minimal discard sectors no | |
2479 | * matter what size of 'host->max_busy_timeout', but if the | |
2480 | * 'host->max_busy_timeout' is large enough for more discard sectors, | |
2481 | * then we can continue to increase the max discard sectors until we | |
12182aff UH |
2482 | * get a balance value. In cases when the 'host->max_busy_timeout' |
2483 | * isn't specified, use the default max erase timeout. | |
bb4eecf2 | 2484 | */ |
e056a1b5 AH |
2485 | do { |
2486 | y = 0; | |
2487 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
2488 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
bb4eecf2 | 2489 | |
12182aff | 2490 | if (qty + x > min_qty && timeout > max_busy_timeout) |
e056a1b5 | 2491 | break; |
bb4eecf2 | 2492 | |
e056a1b5 AH |
2493 | if (timeout < last_timeout) |
2494 | break; | |
2495 | last_timeout = timeout; | |
2496 | y = x; | |
2497 | } | |
2498 | qty += y; | |
2499 | } while (y); | |
2500 | ||
2501 | if (!qty) | |
2502 | return 0; | |
2503 | ||
642c28ab DJ |
2504 | /* |
2505 | * When specifying a sector range to trim, chances are we might cross | |
2506 | * an erase-group boundary even if the amount of sectors is less than | |
2507 | * one erase-group. | |
2508 | * If we can only fit one erase-group in the controller timeout budget, | |
2509 | * we have to care that erase-group boundaries are not crossed by a | |
2510 | * single trim operation. We flag that special case with "eg_boundary". | |
2511 | * In all other cases we can just decrement qty and pretend that we | |
2512 | * always touch (qty + 1) erase-groups as a simple optimization. | |
2513 | */ | |
e056a1b5 | 2514 | if (qty == 1) |
642c28ab DJ |
2515 | card->eg_boundary = 1; |
2516 | else | |
2517 | qty--; | |
e056a1b5 AH |
2518 | |
2519 | /* Convert qty to sectors */ | |
2520 | if (card->erase_shift) | |
642c28ab | 2521 | max_discard = qty << card->erase_shift; |
e056a1b5 | 2522 | else if (mmc_card_sd(card)) |
642c28ab | 2523 | max_discard = qty + 1; |
e056a1b5 | 2524 | else |
642c28ab | 2525 | max_discard = qty * card->erase_size; |
e056a1b5 AH |
2526 | |
2527 | return max_discard; | |
2528 | } | |
2529 | ||
2530 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
2531 | { | |
2532 | struct mmc_host *host = card->host; | |
2533 | unsigned int max_discard, max_trim; | |
2534 | ||
e056a1b5 AH |
2535 | /* |
2536 | * Without erase_group_def set, MMC erase timeout depends on clock | |
2537 | * frequence which can change. In that case, the best choice is | |
2538 | * just the preferred erase size. | |
2539 | */ | |
2540 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
2541 | return card->pref_erase; | |
2542 | ||
2543 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
2544 | if (mmc_can_trim(card)) { | |
2545 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
2546 | if (max_trim < max_discard) | |
2547 | max_discard = max_trim; | |
2548 | } else if (max_discard < card->erase_size) { | |
2549 | max_discard = 0; | |
2550 | } | |
2551 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
12182aff UH |
2552 | mmc_hostname(host), max_discard, host->max_busy_timeout ? |
2553 | host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS); | |
e056a1b5 AH |
2554 | return max_discard; |
2555 | } | |
2556 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
2557 | ||
0f8d8ea6 AH |
2558 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
2559 | { | |
c7836d15 | 2560 | struct mmc_command cmd = {}; |
0f8d8ea6 | 2561 | |
1712c937 ZX |
2562 | if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) || |
2563 | mmc_card_hs400(card) || mmc_card_hs400es(card)) | |
0f8d8ea6 AH |
2564 | return 0; |
2565 | ||
0f8d8ea6 AH |
2566 | cmd.opcode = MMC_SET_BLOCKLEN; |
2567 | cmd.arg = blocklen; | |
2568 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2569 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2570 | } | |
2571 | EXPORT_SYMBOL(mmc_set_blocklen); | |
2572 | ||
67c79db8 LP |
2573 | int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount, |
2574 | bool is_rel_write) | |
2575 | { | |
c7836d15 | 2576 | struct mmc_command cmd = {}; |
67c79db8 LP |
2577 | |
2578 | cmd.opcode = MMC_SET_BLOCK_COUNT; | |
2579 | cmd.arg = blockcount & 0x0000FFFF; | |
2580 | if (is_rel_write) | |
2581 | cmd.arg |= 1 << 31; | |
2582 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2583 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2584 | } | |
2585 | EXPORT_SYMBOL(mmc_set_blockcount); | |
2586 | ||
b2499518 AH |
2587 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
2588 | { | |
2589 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2590 | return; | |
b2499518 | 2591 | host->ops->hw_reset(host); |
b2499518 AH |
2592 | } |
2593 | ||
83533ab2 | 2594 | int mmc_hw_reset(struct mmc_host *host) |
b2499518 | 2595 | { |
f855a371 | 2596 | int ret; |
b2499518 | 2597 | |
f855a371 | 2598 | if (!host->card) |
b2499518 AH |
2599 | return -EINVAL; |
2600 | ||
f855a371 JR |
2601 | mmc_bus_get(host); |
2602 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) { | |
2603 | mmc_bus_put(host); | |
b2499518 | 2604 | return -EOPNOTSUPP; |
b2499518 AH |
2605 | } |
2606 | ||
f855a371 JR |
2607 | ret = host->bus_ops->reset(host); |
2608 | mmc_bus_put(host); | |
b2499518 | 2609 | |
4e6c7178 GG |
2610 | if (ret) |
2611 | pr_warn("%s: tried to reset card, got error %d\n", | |
2612 | mmc_hostname(host), ret); | |
b2499518 | 2613 | |
f855a371 | 2614 | return ret; |
b2499518 | 2615 | } |
b2499518 AH |
2616 | EXPORT_SYMBOL(mmc_hw_reset); |
2617 | ||
807e8e40 AR |
2618 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2619 | { | |
2620 | host->f_init = freq; | |
2621 | ||
2622 | #ifdef CONFIG_MMC_DEBUG | |
2623 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2624 | mmc_hostname(host), __func__, host->f_init); | |
2625 | #endif | |
4a065193 | 2626 | mmc_power_up(host, host->ocr_avail); |
2f94e55a | 2627 | |
b2499518 AH |
2628 | /* |
2629 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2630 | * do a hardware reset if possible. | |
2631 | */ | |
2632 | mmc_hw_reset_for_init(host); | |
2633 | ||
2f94e55a PR |
2634 | /* |
2635 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2636 | * if the card is being re-initialized, just send it. CMD52 | |
2637 | * should be ignored by SD/eMMC cards. | |
100a606d | 2638 | * Skip it if we already know that we do not support SDIO commands |
2f94e55a | 2639 | */ |
100a606d CC |
2640 | if (!(host->caps2 & MMC_CAP2_NO_SDIO)) |
2641 | sdio_reset(host); | |
2642 | ||
807e8e40 AR |
2643 | mmc_go_idle(host); |
2644 | ||
1b8d79c5 UH |
2645 | if (!(host->caps2 & MMC_CAP2_NO_SD)) |
2646 | mmc_send_if_cond(host, host->ocr_avail); | |
807e8e40 AR |
2647 | |
2648 | /* Order's important: probe SDIO, then SD, then MMC */ | |
100a606d CC |
2649 | if (!(host->caps2 & MMC_CAP2_NO_SDIO)) |
2650 | if (!mmc_attach_sdio(host)) | |
2651 | return 0; | |
2652 | ||
1b8d79c5 UH |
2653 | if (!(host->caps2 & MMC_CAP2_NO_SD)) |
2654 | if (!mmc_attach_sd(host)) | |
2655 | return 0; | |
2656 | ||
a0c3b68c SL |
2657 | if (!(host->caps2 & MMC_CAP2_NO_MMC)) |
2658 | if (!mmc_attach_mmc(host)) | |
2659 | return 0; | |
807e8e40 AR |
2660 | |
2661 | mmc_power_off(host); | |
2662 | return -EIO; | |
2663 | } | |
2664 | ||
d3049504 AH |
2665 | int _mmc_detect_card_removed(struct mmc_host *host) |
2666 | { | |
2667 | int ret; | |
2668 | ||
d3049504 AH |
2669 | if (!host->card || mmc_card_removed(host->card)) |
2670 | return 1; | |
2671 | ||
2672 | ret = host->bus_ops->alive(host); | |
1450734e KL |
2673 | |
2674 | /* | |
2675 | * Card detect status and alive check may be out of sync if card is | |
2676 | * removed slowly, when card detect switch changes while card/slot | |
2677 | * pads are still contacted in hardware (refer to "SD Card Mechanical | |
2678 | * Addendum, Appendix C: Card Detection Switch"). So reschedule a | |
2679 | * detect work 200ms later for this case. | |
2680 | */ | |
2681 | if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) { | |
2682 | mmc_detect_change(host, msecs_to_jiffies(200)); | |
2683 | pr_debug("%s: card removed too slowly\n", mmc_hostname(host)); | |
2684 | } | |
2685 | ||
d3049504 AH |
2686 | if (ret) { |
2687 | mmc_card_set_removed(host->card); | |
2688 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2689 | } | |
2690 | ||
2691 | return ret; | |
2692 | } | |
2693 | ||
2694 | int mmc_detect_card_removed(struct mmc_host *host) | |
2695 | { | |
2696 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2697 | int ret; |
d3049504 AH |
2698 | |
2699 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2700 | |
2701 | if (!card) | |
2702 | return 1; | |
2703 | ||
6067bafe | 2704 | if (!mmc_card_is_removable(host)) |
1ff2575b UH |
2705 | return 0; |
2706 | ||
f0cc9cf9 | 2707 | ret = mmc_card_removed(card); |
d3049504 AH |
2708 | /* |
2709 | * The card will be considered unchanged unless we have been asked to | |
2710 | * detect a change or host requires polling to provide card detection. | |
2711 | */ | |
b6891679 | 2712 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) |
f0cc9cf9 | 2713 | return ret; |
d3049504 AH |
2714 | |
2715 | host->detect_change = 0; | |
f0cc9cf9 UH |
2716 | if (!ret) { |
2717 | ret = _mmc_detect_card_removed(host); | |
b6891679 | 2718 | if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) { |
f0cc9cf9 UH |
2719 | /* |
2720 | * Schedule a detect work as soon as possible to let a | |
2721 | * rescan handle the card removal. | |
2722 | */ | |
2723 | cancel_delayed_work(&host->detect); | |
bbd43682 | 2724 | _mmc_detect_change(host, 0, false); |
f0cc9cf9 UH |
2725 | } |
2726 | } | |
d3049504 | 2727 | |
f0cc9cf9 | 2728 | return ret; |
d3049504 AH |
2729 | } |
2730 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2731 | ||
b93931a6 | 2732 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2733 | { |
c4028958 DH |
2734 | struct mmc_host *host = |
2735 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2736 | int i; |
4c2ef25f | 2737 | |
807e8e40 | 2738 | if (host->rescan_disable) |
4c2ef25f | 2739 | return; |
1da177e4 | 2740 | |
3339d1e3 | 2741 | /* If there is a non-removable card registered, only scan once */ |
6067bafe | 2742 | if (!mmc_card_is_removable(host) && host->rescan_entered) |
3339d1e3 JR |
2743 | return; |
2744 | host->rescan_entered = 1; | |
2745 | ||
86236813 | 2746 | if (host->trigger_card_event && host->ops->card_event) { |
d234d212 | 2747 | mmc_claim_host(host); |
86236813 | 2748 | host->ops->card_event(host); |
d234d212 | 2749 | mmc_release_host(host); |
86236813 UH |
2750 | host->trigger_card_event = false; |
2751 | } | |
2752 | ||
7ea239d9 | 2753 | mmc_bus_get(host); |
b855885e | 2754 | |
30201e7f OBC |
2755 | /* |
2756 | * if there is a _removable_ card registered, check whether it is | |
2757 | * still present | |
2758 | */ | |
6067bafe | 2759 | if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host)) |
94d89efb JS |
2760 | host->bus_ops->detect(host); |
2761 | ||
d3049504 AH |
2762 | host->detect_change = 0; |
2763 | ||
c5841798 CB |
2764 | /* |
2765 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2766 | * the card is no longer present. | |
2767 | */ | |
94d89efb | 2768 | mmc_bus_put(host); |
94d89efb JS |
2769 | mmc_bus_get(host); |
2770 | ||
2771 | /* if there still is a card present, stop here */ | |
2772 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2773 | mmc_bus_put(host); |
94d89efb JS |
2774 | goto out; |
2775 | } | |
1da177e4 | 2776 | |
94d89efb JS |
2777 | /* |
2778 | * Only we can add a new handler, so it's safe to | |
2779 | * release the lock here. | |
2780 | */ | |
2781 | mmc_bus_put(host); | |
1da177e4 | 2782 | |
d234d212 | 2783 | mmc_claim_host(host); |
6067bafe | 2784 | if (mmc_card_is_removable(host) && host->ops->get_cd && |
c1b55bfc | 2785 | host->ops->get_cd(host) == 0) { |
fa550189 UH |
2786 | mmc_power_off(host); |
2787 | mmc_release_host(host); | |
94d89efb | 2788 | goto out; |
fa550189 | 2789 | } |
1da177e4 | 2790 | |
88ae8b86 | 2791 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2792 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2793 | break; | |
06b2233a | 2794 | if (freqs[i] <= host->f_min) |
807e8e40 | 2795 | break; |
88ae8b86 | 2796 | } |
807e8e40 AR |
2797 | mmc_release_host(host); |
2798 | ||
2799 | out: | |
28f52482 AV |
2800 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2801 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2802 | } |
2803 | ||
b93931a6 | 2804 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2805 | { |
fa550189 | 2806 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2807 | host->rescan_disable = 0; |
8af465db | 2808 | host->ios.power_mode = MMC_POWER_UNDEFINED; |
8d1ffc8c | 2809 | |
c2c24819 UH |
2810 | if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) { |
2811 | mmc_claim_host(host); | |
4a065193 | 2812 | mmc_power_up(host, host->ocr_avail); |
c2c24819 UH |
2813 | mmc_release_host(host); |
2814 | } | |
8d1ffc8c | 2815 | |
740a221e | 2816 | mmc_gpiod_request_cd_irq(host); |
bbd43682 | 2817 | _mmc_detect_change(host, 0, false); |
1da177e4 LT |
2818 | } |
2819 | ||
b93931a6 | 2820 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2821 | { |
3b91e550 | 2822 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2823 | unsigned long flags; |
2824 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2825 | host->removed = 1; |
1efd48b3 | 2826 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 2827 | #endif |
740a221e AH |
2828 | if (host->slot.cd_irq >= 0) |
2829 | disable_irq(host->slot.cd_irq); | |
3b91e550 | 2830 | |
d9adcc12 | 2831 | host->rescan_disable = 1; |
d9bcbf34 | 2832 | cancel_delayed_work_sync(&host->detect); |
3b91e550 | 2833 | |
da68c4eb NP |
2834 | /* clear pm flags now and let card drivers set them as needed */ |
2835 | host->pm_flags = 0; | |
2836 | ||
7ea239d9 PO |
2837 | mmc_bus_get(host); |
2838 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2839 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2840 | host->bus_ops->remove(host); |
7ea239d9 PO |
2841 | mmc_claim_host(host); |
2842 | mmc_detach_bus(host); | |
7f7e4129 | 2843 | mmc_power_off(host); |
7ea239d9 | 2844 | mmc_release_host(host); |
53509f0f DK |
2845 | mmc_bus_put(host); |
2846 | return; | |
1da177e4 | 2847 | } |
7ea239d9 PO |
2848 | mmc_bus_put(host); |
2849 | ||
8d1ffc8c | 2850 | mmc_claim_host(host); |
1da177e4 | 2851 | mmc_power_off(host); |
8d1ffc8c | 2852 | mmc_release_host(host); |
1da177e4 LT |
2853 | } |
2854 | ||
12ae637f | 2855 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2856 | { |
12ae637f OBC |
2857 | int ret = 0; |
2858 | ||
bb9cab94 DD |
2859 | #ifdef CONFIG_MMC_DEBUG |
2860 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2861 | #endif | |
2862 | ||
eae1aeee AH |
2863 | mmc_bus_get(host); |
2864 | ||
5601aaf7 | 2865 | if (!host->bus_ops || host->bus_dead) { |
eae1aeee | 2866 | mmc_bus_put(host); |
12ae637f | 2867 | return -EINVAL; |
eae1aeee AH |
2868 | } |
2869 | ||
2870 | if (host->bus_ops->power_save) | |
12ae637f | 2871 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2872 | |
2873 | mmc_bus_put(host); | |
2874 | ||
2875 | mmc_power_off(host); | |
12ae637f OBC |
2876 | |
2877 | return ret; | |
eae1aeee AH |
2878 | } |
2879 | EXPORT_SYMBOL(mmc_power_save_host); | |
2880 | ||
12ae637f | 2881 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2882 | { |
12ae637f OBC |
2883 | int ret; |
2884 | ||
bb9cab94 DD |
2885 | #ifdef CONFIG_MMC_DEBUG |
2886 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2887 | #endif | |
2888 | ||
eae1aeee AH |
2889 | mmc_bus_get(host); |
2890 | ||
5601aaf7 | 2891 | if (!host->bus_ops || host->bus_dead) { |
eae1aeee | 2892 | mmc_bus_put(host); |
12ae637f | 2893 | return -EINVAL; |
eae1aeee AH |
2894 | } |
2895 | ||
69041150 | 2896 | mmc_power_up(host, host->card->ocr); |
12ae637f | 2897 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2898 | |
2899 | mmc_bus_put(host); | |
12ae637f OBC |
2900 | |
2901 | return ret; | |
eae1aeee AH |
2902 | } |
2903 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2904 | ||
881d1c25 SJ |
2905 | /* |
2906 | * Flush the cache to the non-volatile storage. | |
2907 | */ | |
2908 | int mmc_flush_cache(struct mmc_card *card) | |
2909 | { | |
881d1c25 SJ |
2910 | int err = 0; |
2911 | ||
881d1c25 SJ |
2912 | if (mmc_card_mmc(card) && |
2913 | (card->ext_csd.cache_size > 0) && | |
2914 | (card->ext_csd.cache_ctrl & 1)) { | |
2915 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2916 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2917 | if (err) | |
2918 | pr_err("%s: cache flush error %d\n", | |
2919 | mmc_hostname(card->host), err); | |
2920 | } | |
2921 | ||
2922 | return err; | |
2923 | } | |
2924 | EXPORT_SYMBOL(mmc_flush_cache); | |
2925 | ||
8dede18e | 2926 | #ifdef CONFIG_PM_SLEEP |
4c2ef25f ML |
2927 | /* Do the card removal on suspend if card is assumed removeable |
2928 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2929 | to sync the card. | |
2930 | */ | |
8dede18e UH |
2931 | static int mmc_pm_notify(struct notifier_block *notify_block, |
2932 | unsigned long mode, void *unused) | |
4c2ef25f ML |
2933 | { |
2934 | struct mmc_host *host = container_of( | |
2935 | notify_block, struct mmc_host, pm_notify); | |
2936 | unsigned long flags; | |
810caddb | 2937 | int err = 0; |
4c2ef25f ML |
2938 | |
2939 | switch (mode) { | |
2940 | case PM_HIBERNATION_PREPARE: | |
2941 | case PM_SUSPEND_PREPARE: | |
184af16b | 2942 | case PM_RESTORE_PREPARE: |
4c2ef25f ML |
2943 | spin_lock_irqsave(&host->lock, flags); |
2944 | host->rescan_disable = 1; | |
2945 | spin_unlock_irqrestore(&host->lock, flags); | |
2946 | cancel_delayed_work_sync(&host->detect); | |
2947 | ||
810caddb UH |
2948 | if (!host->bus_ops) |
2949 | break; | |
2950 | ||
2951 | /* Validate prerequisites for suspend */ | |
2952 | if (host->bus_ops->pre_suspend) | |
2953 | err = host->bus_ops->pre_suspend(host); | |
5601aaf7 | 2954 | if (!err) |
4c2ef25f ML |
2955 | break; |
2956 | ||
0db13fc2 | 2957 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2958 | host->bus_ops->remove(host); |
0db13fc2 | 2959 | mmc_claim_host(host); |
4c2ef25f | 2960 | mmc_detach_bus(host); |
7f7e4129 | 2961 | mmc_power_off(host); |
4c2ef25f ML |
2962 | mmc_release_host(host); |
2963 | host->pm_flags = 0; | |
2964 | break; | |
2965 | ||
2966 | case PM_POST_SUSPEND: | |
2967 | case PM_POST_HIBERNATION: | |
274476f8 | 2968 | case PM_POST_RESTORE: |
4c2ef25f ML |
2969 | |
2970 | spin_lock_irqsave(&host->lock, flags); | |
2971 | host->rescan_disable = 0; | |
2972 | spin_unlock_irqrestore(&host->lock, flags); | |
bbd43682 | 2973 | _mmc_detect_change(host, 0, false); |
4c2ef25f ML |
2974 | |
2975 | } | |
2976 | ||
2977 | return 0; | |
2978 | } | |
8dede18e UH |
2979 | |
2980 | void mmc_register_pm_notifier(struct mmc_host *host) | |
2981 | { | |
2982 | host->pm_notify.notifier_call = mmc_pm_notify; | |
2983 | register_pm_notifier(&host->pm_notify); | |
2984 | } | |
2985 | ||
2986 | void mmc_unregister_pm_notifier(struct mmc_host *host) | |
2987 | { | |
2988 | unregister_pm_notifier(&host->pm_notify); | |
2989 | } | |
1da177e4 LT |
2990 | #endif |
2991 | ||
2220eedf KD |
2992 | /** |
2993 | * mmc_init_context_info() - init synchronization context | |
2994 | * @host: mmc host | |
2995 | * | |
2996 | * Init struct context_info needed to implement asynchronous | |
2997 | * request mechanism, used by mmc core, host driver and mmc requests | |
2998 | * supplier. | |
2999 | */ | |
3000 | void mmc_init_context_info(struct mmc_host *host) | |
3001 | { | |
2220eedf KD |
3002 | host->context_info.is_new_req = false; |
3003 | host->context_info.is_done_rcv = false; | |
3004 | host->context_info.is_waiting_last_req = false; | |
3005 | init_waitqueue_head(&host->context_info.wait); | |
3006 | } | |
3007 | ||
ffce2e7e PO |
3008 | static int __init mmc_init(void) |
3009 | { | |
3010 | int ret; | |
3011 | ||
ffce2e7e | 3012 | ret = mmc_register_bus(); |
e29a7d73 | 3013 | if (ret) |
520bd7a8 | 3014 | return ret; |
e29a7d73 PO |
3015 | |
3016 | ret = mmc_register_host_class(); | |
3017 | if (ret) | |
3018 | goto unregister_bus; | |
3019 | ||
3020 | ret = sdio_register_bus(); | |
3021 | if (ret) | |
3022 | goto unregister_host_class; | |
3023 | ||
3024 | return 0; | |
3025 | ||
3026 | unregister_host_class: | |
3027 | mmc_unregister_host_class(); | |
3028 | unregister_bus: | |
3029 | mmc_unregister_bus(); | |
ffce2e7e PO |
3030 | return ret; |
3031 | } | |
3032 | ||
3033 | static void __exit mmc_exit(void) | |
3034 | { | |
e29a7d73 | 3035 | sdio_unregister_bus(); |
ffce2e7e PO |
3036 | mmc_unregister_host_class(); |
3037 | mmc_unregister_bus(); | |
ffce2e7e PO |
3038 | } |
3039 | ||
26074962 | 3040 | subsys_initcall(mmc_init); |
ffce2e7e PO |
3041 | module_exit(mmc_exit); |
3042 | ||
1da177e4 | 3043 | MODULE_LICENSE("GPL"); |