Commit | Line | Data |
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1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
ad3868b2 | 6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
af8350c7 | 21 | #include <linux/leds.h> |
b57c43ad | 22 | #include <linux/scatterlist.h> |
86e8286a | 23 | #include <linux/log2.h> |
5c13941a | 24 | #include <linux/regulator/consumer.h> |
e594573d | 25 | #include <linux/pm_runtime.h> |
35eb6db1 | 26 | #include <linux/suspend.h> |
1b676f70 PF |
27 | #include <linux/fault-inject.h> |
28 | #include <linux/random.h> | |
1da177e4 LT |
29 | |
30 | #include <linux/mmc/card.h> | |
31 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
32 | #include <linux/mmc/mmc.h> |
33 | #include <linux/mmc/sd.h> | |
1da177e4 | 34 | |
aaac1b47 | 35 | #include "core.h" |
ffce2e7e PO |
36 | #include "bus.h" |
37 | #include "host.h" | |
e29a7d73 | 38 | #include "sdio_bus.h" |
da7fbe58 PO |
39 | |
40 | #include "mmc_ops.h" | |
41 | #include "sd_ops.h" | |
5c4e6f13 | 42 | #include "sdio_ops.h" |
1da177e4 | 43 | |
ffce2e7e PO |
44 | static struct workqueue_struct *workqueue; |
45 | ||
af517150 DB |
46 | /* |
47 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
48 | * performance cost, and for other reasons may not always be desired. | |
49 | * So we allow it it to be disabled. | |
50 | */ | |
90ab5ee9 | 51 | bool use_spi_crc = 1; |
af517150 DB |
52 | module_param(use_spi_crc, bool, 0); |
53 | ||
bd68e083 BH |
54 | /* |
55 | * We normally treat cards as removed during suspend if they are not | |
56 | * known to be on a non-removable bus, to avoid the risk of writing | |
57 | * back data to a different card after resume. Allow this to be | |
58 | * overridden if necessary. | |
59 | */ | |
60 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
90ab5ee9 | 61 | bool mmc_assume_removable; |
bd68e083 | 62 | #else |
90ab5ee9 | 63 | bool mmc_assume_removable = 1; |
bd68e083 | 64 | #endif |
71d7d3d1 | 65 | EXPORT_SYMBOL(mmc_assume_removable); |
bd68e083 BH |
66 | module_param_named(removable, mmc_assume_removable, bool, 0644); |
67 | MODULE_PARM_DESC( | |
68 | removable, | |
69 | "MMC/SD cards are removable and may be removed during suspend"); | |
70 | ||
ffce2e7e PO |
71 | /* |
72 | * Internal function. Schedule delayed work in the MMC work queue. | |
73 | */ | |
74 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
75 | unsigned long delay) | |
76 | { | |
77 | return queue_delayed_work(workqueue, work, delay); | |
78 | } | |
79 | ||
80 | /* | |
81 | * Internal function. Flush all scheduled work from the MMC work queue. | |
82 | */ | |
83 | static void mmc_flush_scheduled_work(void) | |
84 | { | |
85 | flush_workqueue(workqueue); | |
86 | } | |
87 | ||
1b676f70 PF |
88 | #ifdef CONFIG_FAIL_MMC_REQUEST |
89 | ||
90 | /* | |
91 | * Internal function. Inject random data errors. | |
92 | * If mmc_data is NULL no errors are injected. | |
93 | */ | |
94 | static void mmc_should_fail_request(struct mmc_host *host, | |
95 | struct mmc_request *mrq) | |
96 | { | |
97 | struct mmc_command *cmd = mrq->cmd; | |
98 | struct mmc_data *data = mrq->data; | |
99 | static const int data_errors[] = { | |
100 | -ETIMEDOUT, | |
101 | -EILSEQ, | |
102 | -EIO, | |
103 | }; | |
104 | ||
105 | if (!data) | |
106 | return; | |
107 | ||
108 | if (cmd->error || data->error || | |
109 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
110 | return; | |
111 | ||
112 | data->error = data_errors[random32() % ARRAY_SIZE(data_errors)]; | |
113 | data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9; | |
114 | } | |
115 | ||
116 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
117 | ||
118 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
119 | struct mmc_request *mrq) | |
120 | { | |
121 | } | |
122 | ||
123 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
124 | ||
1da177e4 | 125 | /** |
fe10c6ab RK |
126 | * mmc_request_done - finish processing an MMC request |
127 | * @host: MMC host which completed request | |
128 | * @mrq: MMC request which request | |
1da177e4 LT |
129 | * |
130 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 131 | * their processing of a request. |
1da177e4 LT |
132 | */ |
133 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
134 | { | |
135 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
136 | int err = cmd->error; |
137 | ||
af517150 DB |
138 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
139 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
140 | cmd->retries = 0; | |
141 | } | |
142 | ||
d3049504 | 143 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
144 | /* |
145 | * Request starter must handle retries - see | |
146 | * mmc_wait_for_req_done(). | |
147 | */ | |
148 | if (mrq->done) | |
149 | mrq->done(mrq); | |
e4d21708 | 150 | } else { |
1b676f70 PF |
151 | mmc_should_fail_request(host, mrq); |
152 | ||
af8350c7 PO |
153 | led_trigger_event(host->led, LED_OFF); |
154 | ||
e4d21708 PO |
155 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
156 | mmc_hostname(host), cmd->opcode, err, | |
157 | cmd->resp[0], cmd->resp[1], | |
158 | cmd->resp[2], cmd->resp[3]); | |
159 | ||
160 | if (mrq->data) { | |
161 | pr_debug("%s: %d bytes transferred: %d\n", | |
162 | mmc_hostname(host), | |
163 | mrq->data->bytes_xfered, mrq->data->error); | |
164 | } | |
165 | ||
166 | if (mrq->stop) { | |
167 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
168 | mmc_hostname(host), mrq->stop->opcode, | |
169 | mrq->stop->error, | |
170 | mrq->stop->resp[0], mrq->stop->resp[1], | |
171 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
172 | } | |
173 | ||
174 | if (mrq->done) | |
175 | mrq->done(mrq); | |
04566831 | 176 | |
08c14071 | 177 | mmc_host_clk_release(host); |
1da177e4 LT |
178 | } |
179 | } | |
180 | ||
181 | EXPORT_SYMBOL(mmc_request_done); | |
182 | ||
39361851 | 183 | static void |
1da177e4 LT |
184 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
185 | { | |
976d9276 PO |
186 | #ifdef CONFIG_MMC_DEBUG |
187 | unsigned int i, sz; | |
a84756c5 | 188 | struct scatterlist *sg; |
976d9276 PO |
189 | #endif |
190 | ||
7b2fd4f2 JC |
191 | if (mrq->sbc) { |
192 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
193 | mmc_hostname(host), mrq->sbc->opcode, | |
194 | mrq->sbc->arg, mrq->sbc->flags); | |
195 | } | |
196 | ||
920e70c5 RK |
197 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
198 | mmc_hostname(host), mrq->cmd->opcode, | |
199 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 200 | |
e4d21708 PO |
201 | if (mrq->data) { |
202 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
203 | "tsac %d ms nsac %d\n", | |
204 | mmc_hostname(host), mrq->data->blksz, | |
205 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 206 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
207 | mrq->data->timeout_clks); |
208 | } | |
209 | ||
210 | if (mrq->stop) { | |
211 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
212 | mmc_hostname(host), mrq->stop->opcode, | |
213 | mrq->stop->arg, mrq->stop->flags); | |
214 | } | |
215 | ||
f22ee4ed | 216 | WARN_ON(!host->claimed); |
1da177e4 LT |
217 | |
218 | mrq->cmd->error = 0; | |
219 | mrq->cmd->mrq = mrq; | |
220 | if (mrq->data) { | |
fe4a3c7a | 221 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
222 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
223 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
224 | host->max_req_size); | |
fe4a3c7a | 225 | |
976d9276 PO |
226 | #ifdef CONFIG_MMC_DEBUG |
227 | sz = 0; | |
a84756c5 PO |
228 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
229 | sz += sg->length; | |
976d9276 PO |
230 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
231 | #endif | |
232 | ||
1da177e4 LT |
233 | mrq->cmd->data = mrq->data; |
234 | mrq->data->error = 0; | |
235 | mrq->data->mrq = mrq; | |
236 | if (mrq->stop) { | |
237 | mrq->data->stop = mrq->stop; | |
238 | mrq->stop->error = 0; | |
239 | mrq->stop->mrq = mrq; | |
240 | } | |
241 | } | |
08c14071 | 242 | mmc_host_clk_hold(host); |
66c036e0 | 243 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
244 | host->ops->request(host, mrq); |
245 | } | |
246 | ||
1da177e4 LT |
247 | static void mmc_wait_done(struct mmc_request *mrq) |
248 | { | |
aa8b683a PF |
249 | complete(&mrq->completion); |
250 | } | |
251 | ||
956d9fd5 | 252 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a PF |
253 | { |
254 | init_completion(&mrq->completion); | |
255 | mrq->done = mmc_wait_done; | |
d3049504 AH |
256 | if (mmc_card_removed(host->card)) { |
257 | mrq->cmd->error = -ENOMEDIUM; | |
258 | complete(&mrq->completion); | |
956d9fd5 | 259 | return -ENOMEDIUM; |
d3049504 | 260 | } |
aa8b683a | 261 | mmc_start_request(host, mrq); |
956d9fd5 | 262 | return 0; |
aa8b683a PF |
263 | } |
264 | ||
265 | static void mmc_wait_for_req_done(struct mmc_host *host, | |
266 | struct mmc_request *mrq) | |
267 | { | |
08a7e1df AH |
268 | struct mmc_command *cmd; |
269 | ||
270 | while (1) { | |
271 | wait_for_completion(&mrq->completion); | |
272 | ||
273 | cmd = mrq->cmd; | |
d3049504 AH |
274 | if (!cmd->error || !cmd->retries || |
275 | mmc_card_removed(host->card)) | |
08a7e1df AH |
276 | break; |
277 | ||
278 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
279 | mmc_hostname(host), cmd->opcode, cmd->error); | |
280 | cmd->retries--; | |
281 | cmd->error = 0; | |
282 | host->ops->request(host, mrq); | |
283 | } | |
aa8b683a PF |
284 | } |
285 | ||
286 | /** | |
287 | * mmc_pre_req - Prepare for a new request | |
288 | * @host: MMC host to prepare command | |
289 | * @mrq: MMC request to prepare for | |
290 | * @is_first_req: true if there is no previous started request | |
291 | * that may run in parellel to this call, otherwise false | |
292 | * | |
293 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
294 | * host prepare for the new request. Preparation of a request may be | |
295 | * performed while another request is running on the host. | |
296 | */ | |
297 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
298 | bool is_first_req) | |
299 | { | |
2c4967f7 SRT |
300 | if (host->ops->pre_req) { |
301 | mmc_host_clk_hold(host); | |
aa8b683a | 302 | host->ops->pre_req(host, mrq, is_first_req); |
2c4967f7 SRT |
303 | mmc_host_clk_release(host); |
304 | } | |
aa8b683a PF |
305 | } |
306 | ||
307 | /** | |
308 | * mmc_post_req - Post process a completed request | |
309 | * @host: MMC host to post process command | |
310 | * @mrq: MMC request to post process for | |
311 | * @err: Error, if non zero, clean up any resources made in pre_req | |
312 | * | |
313 | * Let the host post process a completed request. Post processing of | |
314 | * a request may be performed while another reuqest is running. | |
315 | */ | |
316 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
317 | int err) | |
318 | { | |
2c4967f7 SRT |
319 | if (host->ops->post_req) { |
320 | mmc_host_clk_hold(host); | |
aa8b683a | 321 | host->ops->post_req(host, mrq, err); |
2c4967f7 SRT |
322 | mmc_host_clk_release(host); |
323 | } | |
1da177e4 LT |
324 | } |
325 | ||
aa8b683a PF |
326 | /** |
327 | * mmc_start_req - start a non-blocking request | |
328 | * @host: MMC host to start command | |
329 | * @areq: async request to start | |
330 | * @error: out parameter returns 0 for success, otherwise non zero | |
331 | * | |
332 | * Start a new MMC custom command request for a host. | |
333 | * If there is on ongoing async request wait for completion | |
334 | * of that request and start the new one and return. | |
335 | * Does not wait for the new request to complete. | |
336 | * | |
337 | * Returns the completed request, NULL in case of none completed. | |
338 | * Wait for the an ongoing request (previoulsy started) to complete and | |
339 | * return the completed request. If there is no ongoing request, NULL | |
340 | * is returned without waiting. NULL is not an error condition. | |
341 | */ | |
342 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
343 | struct mmc_async_req *areq, int *error) | |
344 | { | |
345 | int err = 0; | |
956d9fd5 | 346 | int start_err = 0; |
aa8b683a PF |
347 | struct mmc_async_req *data = host->areq; |
348 | ||
349 | /* Prepare a new request */ | |
350 | if (areq) | |
351 | mmc_pre_req(host, areq->mrq, !host->areq); | |
352 | ||
353 | if (host->areq) { | |
354 | mmc_wait_for_req_done(host, host->areq->mrq); | |
355 | err = host->areq->err_check(host->card, host->areq); | |
aa8b683a PF |
356 | } |
357 | ||
956d9fd5 UH |
358 | if (!err && areq) |
359 | start_err = __mmc_start_req(host, areq->mrq); | |
aa8b683a PF |
360 | |
361 | if (host->areq) | |
362 | mmc_post_req(host, host->areq->mrq, 0); | |
363 | ||
956d9fd5 UH |
364 | /* Cancel a prepared request if it was not started. */ |
365 | if ((err || start_err) && areq) | |
366 | mmc_post_req(host, areq->mrq, -EINVAL); | |
367 | ||
368 | if (err) | |
369 | host->areq = NULL; | |
370 | else | |
371 | host->areq = areq; | |
372 | ||
aa8b683a PF |
373 | if (error) |
374 | *error = err; | |
375 | return data; | |
376 | } | |
377 | EXPORT_SYMBOL(mmc_start_req); | |
378 | ||
67a61c48 PO |
379 | /** |
380 | * mmc_wait_for_req - start a request and wait for completion | |
381 | * @host: MMC host to start command | |
382 | * @mrq: MMC request to start | |
383 | * | |
384 | * Start a new MMC custom command request for a host, and wait | |
385 | * for the command to complete. Does not attempt to parse the | |
386 | * response. | |
387 | */ | |
388 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 389 | { |
aa8b683a PF |
390 | __mmc_start_req(host, mrq); |
391 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 392 | } |
1da177e4 LT |
393 | EXPORT_SYMBOL(mmc_wait_for_req); |
394 | ||
eb0d8f13 JC |
395 | /** |
396 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
397 | * @card: the MMC card associated with the HPI transfer | |
398 | * | |
399 | * Issued High Priority Interrupt, and check for card status | |
400 | * util out-of prg-state. | |
401 | */ | |
402 | int mmc_interrupt_hpi(struct mmc_card *card) | |
403 | { | |
404 | int err; | |
405 | u32 status; | |
406 | ||
407 | BUG_ON(!card); | |
408 | ||
409 | if (!card->ext_csd.hpi_en) { | |
410 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
411 | return 1; | |
412 | } | |
413 | ||
414 | mmc_claim_host(card->host); | |
415 | err = mmc_send_status(card, &status); | |
416 | if (err) { | |
417 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
418 | goto out; | |
419 | } | |
420 | ||
421 | /* | |
422 | * If the card status is in PRG-state, we can send the HPI command. | |
423 | */ | |
424 | if (R1_CURRENT_STATE(status) == R1_STATE_PRG) { | |
425 | do { | |
426 | /* | |
427 | * We don't know when the HPI command will finish | |
428 | * processing, so we need to resend HPI until out | |
429 | * of prg-state, and keep checking the card status | |
430 | * with SEND_STATUS. If a timeout error occurs when | |
431 | * sending the HPI command, we are already out of | |
432 | * prg-state. | |
433 | */ | |
434 | err = mmc_send_hpi_cmd(card, &status); | |
435 | if (err) | |
436 | pr_debug("%s: abort HPI (%d error)\n", | |
437 | mmc_hostname(card->host), err); | |
438 | ||
439 | err = mmc_send_status(card, &status); | |
440 | if (err) | |
441 | break; | |
442 | } while (R1_CURRENT_STATE(status) == R1_STATE_PRG); | |
443 | } else | |
444 | pr_debug("%s: Left prg-state\n", mmc_hostname(card->host)); | |
445 | ||
446 | out: | |
447 | mmc_release_host(card->host); | |
448 | return err; | |
449 | } | |
450 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
451 | ||
1da177e4 LT |
452 | /** |
453 | * mmc_wait_for_cmd - start a command and wait for completion | |
454 | * @host: MMC host to start command | |
455 | * @cmd: MMC command to start | |
456 | * @retries: maximum number of retries | |
457 | * | |
458 | * Start a new MMC command for a host, and wait for the command | |
459 | * to complete. Return any error that occurred while the command | |
460 | * was executing. Do not attempt to parse the response. | |
461 | */ | |
462 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
463 | { | |
ad5fd972 | 464 | struct mmc_request mrq = {NULL}; |
1da177e4 | 465 | |
d84075c8 | 466 | WARN_ON(!host->claimed); |
1da177e4 | 467 | |
1da177e4 LT |
468 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
469 | cmd->retries = retries; | |
470 | ||
471 | mrq.cmd = cmd; | |
472 | cmd->data = NULL; | |
473 | ||
474 | mmc_wait_for_req(host, &mrq); | |
475 | ||
476 | return cmd->error; | |
477 | } | |
478 | ||
479 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
480 | ||
d773d725 RK |
481 | /** |
482 | * mmc_set_data_timeout - set the timeout for a data command | |
483 | * @data: data phase for command | |
484 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
485 | * |
486 | * Computes the data timeout parameters according to the | |
487 | * correct algorithm given the card type. | |
d773d725 | 488 | */ |
b146d26a | 489 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
490 | { |
491 | unsigned int mult; | |
492 | ||
e6f918bf PO |
493 | /* |
494 | * SDIO cards only define an upper 1 s limit on access. | |
495 | */ | |
496 | if (mmc_card_sdio(card)) { | |
497 | data->timeout_ns = 1000000000; | |
498 | data->timeout_clks = 0; | |
499 | return; | |
500 | } | |
501 | ||
d773d725 RK |
502 | /* |
503 | * SD cards use a 100 multiplier rather than 10 | |
504 | */ | |
505 | mult = mmc_card_sd(card) ? 100 : 10; | |
506 | ||
507 | /* | |
508 | * Scale up the multiplier (and therefore the timeout) by | |
509 | * the r2w factor for writes. | |
510 | */ | |
b146d26a | 511 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
512 | mult <<= card->csd.r2w_factor; |
513 | ||
514 | data->timeout_ns = card->csd.tacc_ns * mult; | |
515 | data->timeout_clks = card->csd.tacc_clks * mult; | |
516 | ||
517 | /* | |
518 | * SD cards also have an upper limit on the timeout. | |
519 | */ | |
520 | if (mmc_card_sd(card)) { | |
521 | unsigned int timeout_us, limit_us; | |
522 | ||
523 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
524 | if (mmc_host_clk_rate(card->host)) |
525 | timeout_us += data->timeout_clks * 1000 / | |
526 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 527 | |
b146d26a | 528 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 529 | /* |
3bdc9ba8 PW |
530 | * The MMC spec "It is strongly recommended |
531 | * for hosts to implement more than 500ms | |
532 | * timeout value even if the card indicates | |
533 | * the 250ms maximum busy length." Even the | |
534 | * previous value of 300ms is known to be | |
535 | * insufficient for some cards. | |
493890e7 | 536 | */ |
3bdc9ba8 | 537 | limit_us = 3000000; |
d773d725 RK |
538 | else |
539 | limit_us = 100000; | |
540 | ||
fba68bd2 PL |
541 | /* |
542 | * SDHC cards always use these fixed values. | |
543 | */ | |
544 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
545 | data->timeout_ns = limit_us * 1000; |
546 | data->timeout_clks = 0; | |
547 | } | |
548 | } | |
6de5fc9c SNX |
549 | |
550 | /* | |
551 | * Some cards require longer data read timeout than indicated in CSD. | |
552 | * Address this by setting the read timeout to a "reasonably high" | |
553 | * value. For the cards tested, 300ms has proven enough. If necessary, | |
554 | * this value can be increased if other problematic cards require this. | |
555 | */ | |
556 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
557 | data->timeout_ns = 300000000; | |
558 | data->timeout_clks = 0; | |
559 | } | |
560 | ||
c0c88871 WM |
561 | /* |
562 | * Some cards need very high timeouts if driven in SPI mode. | |
563 | * The worst observed timeout was 900ms after writing a | |
564 | * continuous stream of data until the internal logic | |
565 | * overflowed. | |
566 | */ | |
567 | if (mmc_host_is_spi(card->host)) { | |
568 | if (data->flags & MMC_DATA_WRITE) { | |
569 | if (data->timeout_ns < 1000000000) | |
570 | data->timeout_ns = 1000000000; /* 1s */ | |
571 | } else { | |
572 | if (data->timeout_ns < 100000000) | |
573 | data->timeout_ns = 100000000; /* 100ms */ | |
574 | } | |
575 | } | |
d773d725 RK |
576 | } |
577 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
578 | ||
ad3868b2 PO |
579 | /** |
580 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
581 | * @card: the MMC card associated with the data transfer | |
582 | * @sz: original transfer size | |
583 | * | |
584 | * Pads the original data size with a number of extra bytes in | |
585 | * order to avoid controller bugs and/or performance hits | |
586 | * (e.g. some controllers revert to PIO for certain sizes). | |
587 | * | |
588 | * Returns the improved size, which might be unmodified. | |
589 | * | |
590 | * Note that this function is only relevant when issuing a | |
591 | * single scatter gather entry. | |
592 | */ | |
593 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
594 | { | |
595 | /* | |
596 | * FIXME: We don't have a system for the controller to tell | |
597 | * the core about its problems yet, so for now we just 32-bit | |
598 | * align the size. | |
599 | */ | |
600 | sz = ((sz + 3) / 4) * 4; | |
601 | ||
602 | return sz; | |
603 | } | |
604 | EXPORT_SYMBOL(mmc_align_data_size); | |
605 | ||
1da177e4 | 606 | /** |
2342f332 | 607 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 608 | * @host: mmc host to claim |
2342f332 | 609 | * @abort: whether or not the operation should be aborted |
1da177e4 | 610 | * |
2342f332 NP |
611 | * Claim a host for a set of operations. If @abort is non null and |
612 | * dereference a non-zero value then this will return prematurely with | |
613 | * that non-zero value without acquiring the lock. Returns zero | |
614 | * with the lock held otherwise. | |
1da177e4 | 615 | */ |
2342f332 | 616 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
617 | { |
618 | DECLARE_WAITQUEUE(wait, current); | |
619 | unsigned long flags; | |
2342f332 | 620 | int stop; |
1da177e4 | 621 | |
cf795bfb PO |
622 | might_sleep(); |
623 | ||
1da177e4 LT |
624 | add_wait_queue(&host->wq, &wait); |
625 | spin_lock_irqsave(&host->lock, flags); | |
626 | while (1) { | |
627 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 628 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 629 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
630 | break; |
631 | spin_unlock_irqrestore(&host->lock, flags); | |
632 | schedule(); | |
633 | spin_lock_irqsave(&host->lock, flags); | |
634 | } | |
635 | set_current_state(TASK_RUNNING); | |
319a3f14 | 636 | if (!stop) { |
2342f332 | 637 | host->claimed = 1; |
319a3f14 AH |
638 | host->claimer = current; |
639 | host->claim_cnt += 1; | |
640 | } else | |
2342f332 | 641 | wake_up(&host->wq); |
1da177e4 LT |
642 | spin_unlock_irqrestore(&host->lock, flags); |
643 | remove_wait_queue(&host->wq, &wait); | |
907d2e7c AH |
644 | if (host->ops->enable && !stop && host->claim_cnt == 1) |
645 | host->ops->enable(host); | |
2342f332 | 646 | return stop; |
1da177e4 LT |
647 | } |
648 | ||
2342f332 | 649 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 650 | |
319a3f14 AH |
651 | /** |
652 | * mmc_try_claim_host - try exclusively to claim a host | |
653 | * @host: mmc host to claim | |
654 | * | |
655 | * Returns %1 if the host is claimed, %0 otherwise. | |
656 | */ | |
657 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
658 | { |
659 | int claimed_host = 0; | |
660 | unsigned long flags; | |
661 | ||
662 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 663 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 664 | host->claimed = 1; |
319a3f14 AH |
665 | host->claimer = current; |
666 | host->claim_cnt += 1; | |
8ea926b2 AH |
667 | claimed_host = 1; |
668 | } | |
669 | spin_unlock_irqrestore(&host->lock, flags); | |
907d2e7c AH |
670 | if (host->ops->enable && claimed_host && host->claim_cnt == 1) |
671 | host->ops->enable(host); | |
8ea926b2 AH |
672 | return claimed_host; |
673 | } | |
319a3f14 | 674 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 675 | |
ab1efd27 | 676 | /** |
907d2e7c | 677 | * mmc_release_host - release a host |
ab1efd27 UH |
678 | * @host: mmc host to release |
679 | * | |
907d2e7c AH |
680 | * Release a MMC host, allowing others to claim the host |
681 | * for their operations. | |
ab1efd27 | 682 | */ |
907d2e7c | 683 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
684 | { |
685 | unsigned long flags; | |
686 | ||
907d2e7c AH |
687 | WARN_ON(!host->claimed); |
688 | ||
689 | if (host->ops->disable && host->claim_cnt == 1) | |
690 | host->ops->disable(host); | |
691 | ||
8ea926b2 | 692 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
693 | if (--host->claim_cnt) { |
694 | /* Release for nested claim */ | |
695 | spin_unlock_irqrestore(&host->lock, flags); | |
696 | } else { | |
697 | host->claimed = 0; | |
698 | host->claimer = NULL; | |
699 | spin_unlock_irqrestore(&host->lock, flags); | |
700 | wake_up(&host->wq); | |
701 | } | |
8ea926b2 | 702 | } |
1da177e4 LT |
703 | EXPORT_SYMBOL(mmc_release_host); |
704 | ||
7ea239d9 PO |
705 | /* |
706 | * Internal function that does the actual ios call to the host driver, | |
707 | * optionally printing some debug output. | |
708 | */ | |
920e70c5 RK |
709 | static inline void mmc_set_ios(struct mmc_host *host) |
710 | { | |
711 | struct mmc_ios *ios = &host->ios; | |
712 | ||
cd9277c0 PO |
713 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
714 | "width %u timing %u\n", | |
920e70c5 RK |
715 | mmc_hostname(host), ios->clock, ios->bus_mode, |
716 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 717 | ios->bus_width, ios->timing); |
fba68bd2 | 718 | |
04566831 LW |
719 | if (ios->clock > 0) |
720 | mmc_set_ungated(host); | |
920e70c5 RK |
721 | host->ops->set_ios(host, ios); |
722 | } | |
723 | ||
7ea239d9 PO |
724 | /* |
725 | * Control chip select pin on a host. | |
726 | */ | |
da7fbe58 | 727 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 728 | { |
778e277c | 729 | mmc_host_clk_hold(host); |
da7fbe58 PO |
730 | host->ios.chip_select = mode; |
731 | mmc_set_ios(host); | |
778e277c | 732 | mmc_host_clk_release(host); |
1da177e4 LT |
733 | } |
734 | ||
7ea239d9 PO |
735 | /* |
736 | * Sets the host clock to the highest possible frequency that | |
737 | * is below "hz". | |
738 | */ | |
778e277c | 739 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
740 | { |
741 | WARN_ON(hz < host->f_min); | |
742 | ||
743 | if (hz > host->f_max) | |
744 | hz = host->f_max; | |
745 | ||
746 | host->ios.clock = hz; | |
747 | mmc_set_ios(host); | |
748 | } | |
749 | ||
778e277c MW |
750 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
751 | { | |
752 | mmc_host_clk_hold(host); | |
753 | __mmc_set_clock(host, hz); | |
754 | mmc_host_clk_release(host); | |
755 | } | |
756 | ||
04566831 LW |
757 | #ifdef CONFIG_MMC_CLKGATE |
758 | /* | |
759 | * This gates the clock by setting it to 0 Hz. | |
760 | */ | |
761 | void mmc_gate_clock(struct mmc_host *host) | |
762 | { | |
763 | unsigned long flags; | |
764 | ||
765 | spin_lock_irqsave(&host->clk_lock, flags); | |
766 | host->clk_old = host->ios.clock; | |
767 | host->ios.clock = 0; | |
768 | host->clk_gated = true; | |
769 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
770 | mmc_set_ios(host); | |
771 | } | |
772 | ||
773 | /* | |
774 | * This restores the clock from gating by using the cached | |
775 | * clock value. | |
776 | */ | |
777 | void mmc_ungate_clock(struct mmc_host *host) | |
778 | { | |
779 | /* | |
780 | * We should previously have gated the clock, so the clock shall | |
781 | * be 0 here! The clock may however be 0 during initialization, | |
782 | * when some request operations are performed before setting | |
783 | * the frequency. When ungate is requested in that situation | |
784 | * we just ignore the call. | |
785 | */ | |
786 | if (host->clk_old) { | |
787 | BUG_ON(host->ios.clock); | |
788 | /* This call will also set host->clk_gated to false */ | |
778e277c | 789 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
790 | } |
791 | } | |
792 | ||
793 | void mmc_set_ungated(struct mmc_host *host) | |
794 | { | |
795 | unsigned long flags; | |
796 | ||
797 | /* | |
798 | * We've been given a new frequency while the clock is gated, | |
799 | * so make sure we regard this as ungating it. | |
800 | */ | |
801 | spin_lock_irqsave(&host->clk_lock, flags); | |
802 | host->clk_gated = false; | |
803 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
804 | } | |
805 | ||
806 | #else | |
807 | void mmc_set_ungated(struct mmc_host *host) | |
808 | { | |
809 | } | |
810 | #endif | |
811 | ||
7ea239d9 PO |
812 | /* |
813 | * Change the bus mode (open drain/push-pull) of a host. | |
814 | */ | |
815 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
816 | { | |
778e277c | 817 | mmc_host_clk_hold(host); |
7ea239d9 PO |
818 | host->ios.bus_mode = mode; |
819 | mmc_set_ios(host); | |
778e277c | 820 | mmc_host_clk_release(host); |
7ea239d9 PO |
821 | } |
822 | ||
0f8d8ea6 AH |
823 | /* |
824 | * Change data bus width of a host. | |
825 | */ | |
826 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
827 | { | |
778e277c | 828 | mmc_host_clk_hold(host); |
4c4cb171 PR |
829 | host->ios.bus_width = width; |
830 | mmc_set_ios(host); | |
778e277c | 831 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
832 | } |
833 | ||
86e8286a AV |
834 | /** |
835 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
836 | * @vdd: voltage (mV) | |
837 | * @low_bits: prefer low bits in boundary cases | |
838 | * | |
839 | * This function returns the OCR bit number according to the provided @vdd | |
840 | * value. If conversion is not possible a negative errno value returned. | |
841 | * | |
842 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
843 | * on boundary voltages. For example, | |
844 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
845 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
846 | * | |
847 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
848 | */ | |
849 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
850 | { | |
851 | const int max_bit = ilog2(MMC_VDD_35_36); | |
852 | int bit; | |
853 | ||
854 | if (vdd < 1650 || vdd > 3600) | |
855 | return -EINVAL; | |
856 | ||
857 | if (vdd >= 1650 && vdd <= 1950) | |
858 | return ilog2(MMC_VDD_165_195); | |
859 | ||
860 | if (low_bits) | |
861 | vdd -= 1; | |
862 | ||
863 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
864 | bit = (vdd - 2000) / 100 + 8; | |
865 | if (bit > max_bit) | |
866 | return max_bit; | |
867 | return bit; | |
868 | } | |
869 | ||
870 | /** | |
871 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
872 | * @vdd_min: minimum voltage value (mV) | |
873 | * @vdd_max: maximum voltage value (mV) | |
874 | * | |
875 | * This function returns the OCR mask bits according to the provided @vdd_min | |
876 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
877 | * | |
878 | * Notes wrt boundary cases: | |
879 | * This function sets the OCR bits for all boundary voltages, for example | |
880 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
881 | * MMC_VDD_34_35 mask. | |
882 | */ | |
883 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
884 | { | |
885 | u32 mask = 0; | |
886 | ||
887 | if (vdd_max < vdd_min) | |
888 | return 0; | |
889 | ||
890 | /* Prefer high bits for the boundary vdd_max values. */ | |
891 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
892 | if (vdd_max < 0) | |
893 | return 0; | |
894 | ||
895 | /* Prefer low bits for the boundary vdd_min values. */ | |
896 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
897 | if (vdd_min < 0) | |
898 | return 0; | |
899 | ||
900 | /* Fill the mask, from max bit to min bit. */ | |
901 | while (vdd_max >= vdd_min) | |
902 | mask |= 1 << vdd_max--; | |
903 | ||
904 | return mask; | |
905 | } | |
906 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
907 | ||
5c13941a DB |
908 | #ifdef CONFIG_REGULATOR |
909 | ||
910 | /** | |
911 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
912 | * @supply: regulator to use | |
913 | * | |
914 | * This returns either a negative errno, or a mask of voltages that | |
915 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
916 | * regulator. This would normally be called before registering the | |
917 | * MMC host adapter. | |
918 | */ | |
919 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
920 | { | |
921 | int result = 0; | |
922 | int count; | |
923 | int i; | |
924 | ||
925 | count = regulator_count_voltages(supply); | |
926 | if (count < 0) | |
927 | return count; | |
928 | ||
929 | for (i = 0; i < count; i++) { | |
930 | int vdd_uV; | |
931 | int vdd_mV; | |
932 | ||
933 | vdd_uV = regulator_list_voltage(supply, i); | |
934 | if (vdd_uV <= 0) | |
935 | continue; | |
936 | ||
937 | vdd_mV = vdd_uV / 1000; | |
938 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
939 | } | |
940 | ||
941 | return result; | |
942 | } | |
943 | EXPORT_SYMBOL(mmc_regulator_get_ocrmask); | |
944 | ||
945 | /** | |
946 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 947 | * @mmc: the host to regulate |
5c13941a | 948 | * @supply: regulator to use |
99fc5131 | 949 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
950 | * |
951 | * Returns zero on success, else negative errno. | |
952 | * | |
953 | * MMC host drivers may use this to enable or disable a regulator using | |
954 | * a particular supply voltage. This would normally be called from the | |
955 | * set_ios() method. | |
956 | */ | |
99fc5131 LW |
957 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
958 | struct regulator *supply, | |
959 | unsigned short vdd_bit) | |
5c13941a DB |
960 | { |
961 | int result = 0; | |
962 | int min_uV, max_uV; | |
5c13941a DB |
963 | |
964 | if (vdd_bit) { | |
965 | int tmp; | |
966 | int voltage; | |
967 | ||
968 | /* REVISIT mmc_vddrange_to_ocrmask() may have set some | |
969 | * bits this regulator doesn't quite support ... don't | |
970 | * be too picky, most cards and regulators are OK with | |
971 | * a 0.1V range goof (it's a small error percentage). | |
972 | */ | |
973 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
974 | if (tmp == 0) { | |
975 | min_uV = 1650 * 1000; | |
976 | max_uV = 1950 * 1000; | |
977 | } else { | |
978 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
979 | max_uV = min_uV + 100 * 1000; | |
980 | } | |
981 | ||
982 | /* avoid needless changes to this voltage; the regulator | |
983 | * might not allow this operation | |
984 | */ | |
985 | voltage = regulator_get_voltage(supply); | |
6e8201f5 JC |
986 | |
987 | if (mmc->caps2 & MMC_CAP2_BROKEN_VOLTAGE) | |
988 | min_uV = max_uV = voltage; | |
989 | ||
5c13941a DB |
990 | if (voltage < 0) |
991 | result = voltage; | |
992 | else if (voltage < min_uV || voltage > max_uV) | |
993 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
994 | else | |
995 | result = 0; | |
996 | ||
99fc5131 | 997 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 998 | result = regulator_enable(supply); |
99fc5131 LW |
999 | if (!result) |
1000 | mmc->regulator_enabled = true; | |
1001 | } | |
1002 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1003 | result = regulator_disable(supply); |
99fc5131 LW |
1004 | if (result == 0) |
1005 | mmc->regulator_enabled = false; | |
5c13941a DB |
1006 | } |
1007 | ||
99fc5131 LW |
1008 | if (result) |
1009 | dev_err(mmc_dev(mmc), | |
1010 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1011 | return result; |
1012 | } | |
1013 | EXPORT_SYMBOL(mmc_regulator_set_ocr); | |
1014 | ||
99fc5131 | 1015 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1016 | |
1da177e4 LT |
1017 | /* |
1018 | * Mask off any voltages we don't support and select | |
1019 | * the lowest voltage | |
1020 | */ | |
7ea239d9 | 1021 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1022 | { |
1023 | int bit; | |
1024 | ||
1025 | ocr &= host->ocr_avail; | |
1026 | ||
1027 | bit = ffs(ocr); | |
1028 | if (bit) { | |
1029 | bit -= 1; | |
1030 | ||
63ef731a | 1031 | ocr &= 3 << bit; |
1da177e4 | 1032 | |
778e277c | 1033 | mmc_host_clk_hold(host); |
1da177e4 | 1034 | host->ios.vdd = bit; |
920e70c5 | 1035 | mmc_set_ios(host); |
778e277c | 1036 | mmc_host_clk_release(host); |
1da177e4 | 1037 | } else { |
f6e10b86 DB |
1038 | pr_warning("%s: host doesn't support card's voltages\n", |
1039 | mmc_hostname(host)); | |
1da177e4 LT |
1040 | ocr = 0; |
1041 | } | |
1042 | ||
1043 | return ocr; | |
1044 | } | |
1045 | ||
261bbd46 | 1046 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11) |
f2119df6 AN |
1047 | { |
1048 | struct mmc_command cmd = {0}; | |
1049 | int err = 0; | |
1050 | ||
1051 | BUG_ON(!host); | |
1052 | ||
1053 | /* | |
1054 | * Send CMD11 only if the request is to switch the card to | |
1055 | * 1.8V signalling. | |
1056 | */ | |
261bbd46 | 1057 | if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) { |
f2119df6 AN |
1058 | cmd.opcode = SD_SWITCH_VOLTAGE; |
1059 | cmd.arg = 0; | |
1060 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1061 | ||
1062 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1063 | if (err) | |
1064 | return err; | |
1065 | ||
1066 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1067 | return -EIO; | |
1068 | } | |
1069 | ||
1070 | host->ios.signal_voltage = signal_voltage; | |
1071 | ||
2c4967f7 SRT |
1072 | if (host->ops->start_signal_voltage_switch) { |
1073 | mmc_host_clk_hold(host); | |
f2119df6 | 1074 | err = host->ops->start_signal_voltage_switch(host, &host->ios); |
2c4967f7 SRT |
1075 | mmc_host_clk_release(host); |
1076 | } | |
f2119df6 AN |
1077 | |
1078 | return err; | |
1079 | } | |
1080 | ||
b57c43ad | 1081 | /* |
7ea239d9 | 1082 | * Select timing parameters for host. |
b57c43ad | 1083 | */ |
7ea239d9 | 1084 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1085 | { |
778e277c | 1086 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1087 | host->ios.timing = timing; |
1088 | mmc_set_ios(host); | |
778e277c | 1089 | mmc_host_clk_release(host); |
b57c43ad PO |
1090 | } |
1091 | ||
d6d50a15 AN |
1092 | /* |
1093 | * Select appropriate driver type for host. | |
1094 | */ | |
1095 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1096 | { | |
778e277c | 1097 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1098 | host->ios.drv_type = drv_type; |
1099 | mmc_set_ios(host); | |
778e277c | 1100 | mmc_host_clk_release(host); |
d6d50a15 AN |
1101 | } |
1102 | ||
a80f1627 G |
1103 | static void mmc_poweroff_notify(struct mmc_host *host) |
1104 | { | |
1105 | struct mmc_card *card; | |
1106 | unsigned int timeout; | |
1107 | unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION; | |
1108 | int err = 0; | |
1109 | ||
1110 | card = host->card; | |
3e73c36b | 1111 | mmc_claim_host(host); |
a80f1627 G |
1112 | |
1113 | /* | |
1114 | * Send power notify command only if card | |
1115 | * is mmc and notify state is powered ON | |
1116 | */ | |
1117 | if (card && mmc_card_mmc(card) && | |
1118 | (card->poweroff_notify_state == MMC_POWERED_ON)) { | |
1119 | ||
1120 | if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) { | |
1121 | notify_type = EXT_CSD_POWER_OFF_SHORT; | |
1122 | timeout = card->ext_csd.generic_cmd6_time; | |
1123 | card->poweroff_notify_state = MMC_POWEROFF_SHORT; | |
1124 | } else { | |
1125 | notify_type = EXT_CSD_POWER_OFF_LONG; | |
1126 | timeout = card->ext_csd.power_off_longtime; | |
1127 | card->poweroff_notify_state = MMC_POWEROFF_LONG; | |
1128 | } | |
1129 | ||
1130 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
1131 | EXT_CSD_POWER_OFF_NOTIFICATION, | |
1132 | notify_type, timeout); | |
1133 | ||
1134 | if (err && err != -EBADMSG) | |
1135 | pr_err("Device failed to respond within %d poweroff " | |
1136 | "time. Forcefully powering down the device\n", | |
1137 | timeout); | |
1138 | ||
1139 | /* Set the card state to no notification after the poweroff */ | |
1140 | card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION; | |
1141 | } | |
3e73c36b | 1142 | mmc_release_host(host); |
a80f1627 G |
1143 | } |
1144 | ||
1da177e4 | 1145 | /* |
45f8245b RK |
1146 | * Apply power to the MMC stack. This is a two-stage process. |
1147 | * First, we enable power to the card without the clock running. | |
1148 | * We then wait a bit for the power to stabilise. Finally, | |
1149 | * enable the bus drivers and clock to the card. | |
1150 | * | |
1151 | * We must _NOT_ enable the clock prior to power stablising. | |
1152 | * | |
1153 | * If a host does all the power sequencing itself, ignore the | |
1154 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
1155 | */ |
1156 | static void mmc_power_up(struct mmc_host *host) | |
1157 | { | |
500f3564 BR |
1158 | int bit; |
1159 | ||
778e277c MW |
1160 | mmc_host_clk_hold(host); |
1161 | ||
500f3564 BR |
1162 | /* If ocr is set, we use it */ |
1163 | if (host->ocr) | |
1164 | bit = ffs(host->ocr) - 1; | |
1165 | else | |
1166 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1167 | |
1168 | host->ios.vdd = bit; | |
44669034 | 1169 | if (mmc_host_is_spi(host)) |
af517150 | 1170 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1171 | else |
af517150 | 1172 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1173 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1174 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1175 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1176 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1177 | mmc_set_ios(host); |
1da177e4 | 1178 | |
f9996aee PO |
1179 | /* |
1180 | * This delay should be sufficient to allow the power supply | |
1181 | * to reach the minimum voltage. | |
1182 | */ | |
79bccc5a | 1183 | mmc_delay(10); |
1da177e4 | 1184 | |
88ae8b86 | 1185 | host->ios.clock = host->f_init; |
8dfd0374 | 1186 | |
1da177e4 | 1187 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1188 | mmc_set_ios(host); |
1da177e4 | 1189 | |
f9996aee PO |
1190 | /* |
1191 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1192 | * time required to reach a stable voltage. | |
1193 | */ | |
79bccc5a | 1194 | mmc_delay(10); |
778e277c MW |
1195 | |
1196 | mmc_host_clk_release(host); | |
1da177e4 LT |
1197 | } |
1198 | ||
7f7e4129 | 1199 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1200 | { |
3e73c36b | 1201 | int err = 0; |
778e277c MW |
1202 | mmc_host_clk_hold(host); |
1203 | ||
1da177e4 LT |
1204 | host->ios.clock = 0; |
1205 | host->ios.vdd = 0; | |
b33d46c3 | 1206 | |
3e73c36b G |
1207 | /* |
1208 | * For eMMC 4.5 device send AWAKE command before | |
1209 | * POWER_OFF_NOTIFY command, because in sleep state | |
1210 | * eMMC 4.5 devices respond to only RESET and AWAKE cmd | |
1211 | */ | |
1212 | if (host->card && mmc_card_is_sleep(host->card) && | |
1213 | host->bus_ops->resume) { | |
1214 | err = host->bus_ops->resume(host); | |
1215 | ||
1216 | if (!err) | |
1217 | mmc_poweroff_notify(host); | |
1218 | else | |
1219 | pr_warning("%s: error %d during resume " | |
1220 | "(continue with poweroff sequence)\n", | |
1221 | mmc_hostname(host), err); | |
1222 | } | |
bec8726a | 1223 | |
b33d46c3 UH |
1224 | /* |
1225 | * Reset ocr mask to be the highest possible voltage supported for | |
1226 | * this mmc host. This value will be used at next power up. | |
1227 | */ | |
1228 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1229 | ||
af517150 DB |
1230 | if (!mmc_host_is_spi(host)) { |
1231 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1232 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1233 | } | |
1da177e4 | 1234 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1235 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1236 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1237 | mmc_set_ios(host); |
778e277c | 1238 | |
041beb1d DD |
1239 | /* |
1240 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1241 | * XO-1.5, require a short delay after poweroff before the card | |
1242 | * can be successfully turned on again. | |
1243 | */ | |
1244 | mmc_delay(1); | |
1245 | ||
778e277c | 1246 | mmc_host_clk_release(host); |
1da177e4 LT |
1247 | } |
1248 | ||
39361851 AB |
1249 | /* |
1250 | * Cleanup when the last reference to the bus operator is dropped. | |
1251 | */ | |
261172fd | 1252 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1253 | { |
1254 | BUG_ON(!host); | |
1255 | BUG_ON(host->bus_refs); | |
1256 | BUG_ON(!host->bus_dead); | |
1257 | ||
1258 | host->bus_ops = NULL; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Increase reference count of bus operator | |
1263 | */ | |
1264 | static inline void mmc_bus_get(struct mmc_host *host) | |
1265 | { | |
1266 | unsigned long flags; | |
1267 | ||
1268 | spin_lock_irqsave(&host->lock, flags); | |
1269 | host->bus_refs++; | |
1270 | spin_unlock_irqrestore(&host->lock, flags); | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Decrease reference count of bus operator and free it if | |
1275 | * it is the last reference. | |
1276 | */ | |
1277 | static inline void mmc_bus_put(struct mmc_host *host) | |
1278 | { | |
1279 | unsigned long flags; | |
1280 | ||
1281 | spin_lock_irqsave(&host->lock, flags); | |
1282 | host->bus_refs--; | |
1283 | if ((host->bus_refs == 0) && host->bus_ops) | |
1284 | __mmc_release_bus(host); | |
1285 | spin_unlock_irqrestore(&host->lock, flags); | |
1286 | } | |
1287 | ||
1da177e4 | 1288 | /* |
7ea239d9 PO |
1289 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1290 | * host at any given time. | |
1da177e4 | 1291 | */ |
7ea239d9 | 1292 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1293 | { |
7ea239d9 | 1294 | unsigned long flags; |
e45a1bd2 | 1295 | |
7ea239d9 PO |
1296 | BUG_ON(!host); |
1297 | BUG_ON(!ops); | |
b855885e | 1298 | |
d84075c8 | 1299 | WARN_ON(!host->claimed); |
bce40a36 | 1300 | |
7ea239d9 | 1301 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1302 | |
7ea239d9 PO |
1303 | BUG_ON(host->bus_ops); |
1304 | BUG_ON(host->bus_refs); | |
b57c43ad | 1305 | |
7ea239d9 PO |
1306 | host->bus_ops = ops; |
1307 | host->bus_refs = 1; | |
1308 | host->bus_dead = 0; | |
b57c43ad | 1309 | |
7ea239d9 | 1310 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1311 | } |
1312 | ||
7ea239d9 | 1313 | /* |
7f7e4129 | 1314 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1315 | */ |
1316 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1317 | { |
7ea239d9 | 1318 | unsigned long flags; |
7ccd266e | 1319 | |
7ea239d9 | 1320 | BUG_ON(!host); |
7ccd266e | 1321 | |
d84075c8 PO |
1322 | WARN_ON(!host->claimed); |
1323 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1324 | |
7ea239d9 | 1325 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1326 | |
7ea239d9 | 1327 | host->bus_dead = 1; |
7ccd266e | 1328 | |
7ea239d9 | 1329 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1330 | |
7ea239d9 | 1331 | mmc_bus_put(host); |
1da177e4 LT |
1332 | } |
1333 | ||
1da177e4 LT |
1334 | /** |
1335 | * mmc_detect_change - process change of state on a MMC socket | |
1336 | * @host: host which changed state. | |
8dc00335 | 1337 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1338 | * |
67a61c48 PO |
1339 | * MMC drivers should call this when they detect a card has been |
1340 | * inserted or removed. The MMC layer will confirm that any | |
1341 | * present card is still functional, and initialize any newly | |
1342 | * inserted. | |
1da177e4 | 1343 | */ |
8dc00335 | 1344 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1345 | { |
3b91e550 | 1346 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1347 | unsigned long flags; |
01f41ec7 | 1348 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1349 | WARN_ON(host->removed); |
01f41ec7 | 1350 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 1351 | #endif |
d3049504 | 1352 | host->detect_change = 1; |
c4028958 | 1353 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1354 | } |
1355 | ||
1356 | EXPORT_SYMBOL(mmc_detect_change); | |
1357 | ||
dfe86cba AH |
1358 | void mmc_init_erase(struct mmc_card *card) |
1359 | { | |
1360 | unsigned int sz; | |
1361 | ||
1362 | if (is_power_of_2(card->erase_size)) | |
1363 | card->erase_shift = ffs(card->erase_size) - 1; | |
1364 | else | |
1365 | card->erase_shift = 0; | |
1366 | ||
1367 | /* | |
1368 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1369 | * card. That is not desirable because it can take a long time | |
1370 | * (minutes) potentially delaying more important I/O, and also the | |
1371 | * timeout calculations become increasingly hugely over-estimated. | |
1372 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1373 | * to that size and alignment. | |
1374 | * | |
1375 | * For SD cards that define Allocation Unit size, limit erases to one | |
1376 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1377 | * Erase Size, whether it is switched on or not, limit to that size. | |
1378 | * Otherwise just have a stab at a good value. For modern cards it | |
1379 | * will end up being 4MiB. Note that if the value is too small, it | |
1380 | * can end up taking longer to erase. | |
1381 | */ | |
1382 | if (mmc_card_sd(card) && card->ssr.au) { | |
1383 | card->pref_erase = card->ssr.au; | |
1384 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1385 | } else if (card->ext_csd.hc_erase_size) { | |
1386 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1387 | } else { | |
1388 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1389 | if (sz < 128) | |
1390 | card->pref_erase = 512 * 1024 / 512; | |
1391 | else if (sz < 512) | |
1392 | card->pref_erase = 1024 * 1024 / 512; | |
1393 | else if (sz < 1024) | |
1394 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1395 | else | |
1396 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1397 | if (card->pref_erase < card->erase_size) | |
1398 | card->pref_erase = card->erase_size; | |
1399 | else { | |
1400 | sz = card->pref_erase % card->erase_size; | |
1401 | if (sz) | |
1402 | card->pref_erase += card->erase_size - sz; | |
1403 | } | |
1404 | } | |
1405 | } | |
1406 | ||
eaa02f75 AW |
1407 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1408 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1409 | { |
1410 | unsigned int erase_timeout; | |
1411 | ||
7194efb8 AH |
1412 | if (arg == MMC_DISCARD_ARG || |
1413 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
1414 | erase_timeout = card->ext_csd.trim_timeout; | |
1415 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
1416 | /* High Capacity Erase Group Size uses HC timeouts */ |
1417 | if (arg == MMC_TRIM_ARG) | |
1418 | erase_timeout = card->ext_csd.trim_timeout; | |
1419 | else | |
1420 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1421 | } else { | |
1422 | /* CSD Erase Group Size uses write timeout */ | |
1423 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1424 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1425 | unsigned int timeout_us; | |
1426 | ||
1427 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1428 | if (card->csd.tacc_ns < 1000000) | |
1429 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1430 | else | |
1431 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1432 | ||
1433 | /* | |
1434 | * ios.clock is only a target. The real clock rate might be | |
1435 | * less but not that much less, so fudge it by multiplying by 2. | |
1436 | */ | |
1437 | timeout_clks <<= 1; | |
1438 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1439 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1440 | |
1441 | erase_timeout = timeout_us / 1000; | |
1442 | ||
1443 | /* | |
1444 | * Theoretically, the calculation could underflow so round up | |
1445 | * to 1ms in that case. | |
1446 | */ | |
1447 | if (!erase_timeout) | |
1448 | erase_timeout = 1; | |
1449 | } | |
1450 | ||
1451 | /* Multiplier for secure operations */ | |
1452 | if (arg & MMC_SECURE_ARGS) { | |
1453 | if (arg == MMC_SECURE_ERASE_ARG) | |
1454 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1455 | else | |
1456 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1457 | } | |
1458 | ||
1459 | erase_timeout *= qty; | |
1460 | ||
1461 | /* | |
1462 | * Ensure at least a 1 second timeout for SPI as per | |
1463 | * 'mmc_set_data_timeout()' | |
1464 | */ | |
1465 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1466 | erase_timeout = 1000; | |
1467 | ||
eaa02f75 | 1468 | return erase_timeout; |
dfe86cba AH |
1469 | } |
1470 | ||
eaa02f75 AW |
1471 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1472 | unsigned int arg, | |
1473 | unsigned int qty) | |
dfe86cba | 1474 | { |
eaa02f75 AW |
1475 | unsigned int erase_timeout; |
1476 | ||
dfe86cba AH |
1477 | if (card->ssr.erase_timeout) { |
1478 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1479 | erase_timeout = card->ssr.erase_timeout * qty + |
1480 | card->ssr.erase_offset; | |
dfe86cba AH |
1481 | } else { |
1482 | /* | |
1483 | * Erase timeout not specified in SD Status Register (SSR) so | |
1484 | * use 250ms per write block. | |
1485 | */ | |
eaa02f75 | 1486 | erase_timeout = 250 * qty; |
dfe86cba AH |
1487 | } |
1488 | ||
1489 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1490 | if (erase_timeout < 1000) |
1491 | erase_timeout = 1000; | |
1492 | ||
1493 | return erase_timeout; | |
dfe86cba AH |
1494 | } |
1495 | ||
eaa02f75 AW |
1496 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1497 | unsigned int arg, | |
1498 | unsigned int qty) | |
dfe86cba AH |
1499 | { |
1500 | if (mmc_card_sd(card)) | |
eaa02f75 | 1501 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1502 | else |
eaa02f75 | 1503 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1504 | } |
1505 | ||
1506 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1507 | unsigned int to, unsigned int arg) | |
1508 | { | |
1278dba1 | 1509 | struct mmc_command cmd = {0}; |
dfe86cba AH |
1510 | unsigned int qty = 0; |
1511 | int err; | |
1512 | ||
1513 | /* | |
1514 | * qty is used to calculate the erase timeout which depends on how many | |
1515 | * erase groups (or allocation units in SD terminology) are affected. | |
1516 | * We count erasing part of an erase group as one erase group. | |
1517 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1518 | * erase group size is almost certainly also power of 2, but it does not | |
1519 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1520 | * division in that case. SD may not specify an allocation unit size, | |
1521 | * in which case the timeout is based on the number of write blocks. | |
1522 | * | |
1523 | * Note that the timeout for secure trim 2 will only be correct if the | |
1524 | * number of erase groups specified is the same as the total of all | |
1525 | * preceding secure trim 1 commands. Since the power may have been | |
1526 | * lost since the secure trim 1 commands occurred, it is generally | |
1527 | * impossible to calculate the secure trim 2 timeout correctly. | |
1528 | */ | |
1529 | if (card->erase_shift) | |
1530 | qty += ((to >> card->erase_shift) - | |
1531 | (from >> card->erase_shift)) + 1; | |
1532 | else if (mmc_card_sd(card)) | |
1533 | qty += to - from + 1; | |
1534 | else | |
1535 | qty += ((to / card->erase_size) - | |
1536 | (from / card->erase_size)) + 1; | |
1537 | ||
1538 | if (!mmc_card_blockaddr(card)) { | |
1539 | from <<= 9; | |
1540 | to <<= 9; | |
1541 | } | |
1542 | ||
dfe86cba AH |
1543 | if (mmc_card_sd(card)) |
1544 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1545 | else | |
1546 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1547 | cmd.arg = from; | |
1548 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1549 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1550 | if (err) { | |
a3c76eb9 | 1551 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 1552 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 1553 | err = -EIO; |
dfe86cba AH |
1554 | goto out; |
1555 | } | |
1556 | ||
1557 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1558 | if (mmc_card_sd(card)) | |
1559 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1560 | else | |
1561 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1562 | cmd.arg = to; | |
1563 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1564 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1565 | if (err) { | |
a3c76eb9 | 1566 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 1567 | err, cmd.resp[0]); |
67716327 | 1568 | err = -EIO; |
dfe86cba AH |
1569 | goto out; |
1570 | } | |
1571 | ||
1572 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1573 | cmd.opcode = MMC_ERASE; | |
1574 | cmd.arg = arg; | |
1575 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1576 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1577 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1578 | if (err) { | |
a3c76eb9 | 1579 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
1580 | err, cmd.resp[0]); |
1581 | err = -EIO; | |
1582 | goto out; | |
1583 | } | |
1584 | ||
1585 | if (mmc_host_is_spi(card->host)) | |
1586 | goto out; | |
1587 | ||
1588 | do { | |
1589 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1590 | cmd.opcode = MMC_SEND_STATUS; | |
1591 | cmd.arg = card->rca << 16; | |
1592 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1593 | /* Do not retry else we can't see errors */ | |
1594 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1595 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 1596 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
1597 | err, cmd.resp[0]); |
1598 | err = -EIO; | |
1599 | goto out; | |
1600 | } | |
1601 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
7435bb79 | 1602 | R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG); |
dfe86cba AH |
1603 | out: |
1604 | return err; | |
1605 | } | |
1606 | ||
1607 | /** | |
1608 | * mmc_erase - erase sectors. | |
1609 | * @card: card to erase | |
1610 | * @from: first sector to erase | |
1611 | * @nr: number of sectors to erase | |
1612 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1613 | * | |
1614 | * Caller must claim host before calling this function. | |
1615 | */ | |
1616 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1617 | unsigned int arg) | |
1618 | { | |
1619 | unsigned int rem, to = from + nr; | |
1620 | ||
1621 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1622 | !(card->csd.cmdclass & CCC_ERASE)) | |
1623 | return -EOPNOTSUPP; | |
1624 | ||
1625 | if (!card->erase_size) | |
1626 | return -EOPNOTSUPP; | |
1627 | ||
1628 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1629 | return -EOPNOTSUPP; | |
1630 | ||
1631 | if ((arg & MMC_SECURE_ARGS) && | |
1632 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1633 | return -EOPNOTSUPP; | |
1634 | ||
1635 | if ((arg & MMC_TRIM_ARGS) && | |
1636 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1637 | return -EOPNOTSUPP; | |
1638 | ||
1639 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1640 | if (from % card->erase_size || nr % card->erase_size) | |
1641 | return -EINVAL; | |
1642 | } | |
1643 | ||
1644 | if (arg == MMC_ERASE_ARG) { | |
1645 | rem = from % card->erase_size; | |
1646 | if (rem) { | |
1647 | rem = card->erase_size - rem; | |
1648 | from += rem; | |
1649 | if (nr > rem) | |
1650 | nr -= rem; | |
1651 | else | |
1652 | return 0; | |
1653 | } | |
1654 | rem = nr % card->erase_size; | |
1655 | if (rem) | |
1656 | nr -= rem; | |
1657 | } | |
1658 | ||
1659 | if (nr == 0) | |
1660 | return 0; | |
1661 | ||
1662 | to = from + nr; | |
1663 | ||
1664 | if (to <= from) | |
1665 | return -EINVAL; | |
1666 | ||
1667 | /* 'from' and 'to' are inclusive */ | |
1668 | to -= 1; | |
1669 | ||
1670 | return mmc_do_erase(card, from, to, arg); | |
1671 | } | |
1672 | EXPORT_SYMBOL(mmc_erase); | |
1673 | ||
1674 | int mmc_can_erase(struct mmc_card *card) | |
1675 | { | |
1676 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1677 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1678 | return 1; | |
1679 | return 0; | |
1680 | } | |
1681 | EXPORT_SYMBOL(mmc_can_erase); | |
1682 | ||
1683 | int mmc_can_trim(struct mmc_card *card) | |
1684 | { | |
1685 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
1686 | return 1; | |
1687 | return 0; | |
1688 | } | |
1689 | EXPORT_SYMBOL(mmc_can_trim); | |
1690 | ||
b3bf9153 KP |
1691 | int mmc_can_discard(struct mmc_card *card) |
1692 | { | |
1693 | /* | |
1694 | * As there's no way to detect the discard support bit at v4.5 | |
1695 | * use the s/w feature support filed. | |
1696 | */ | |
1697 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
1698 | return 1; | |
1699 | return 0; | |
1700 | } | |
1701 | EXPORT_SYMBOL(mmc_can_discard); | |
1702 | ||
d9ddd629 KP |
1703 | int mmc_can_sanitize(struct mmc_card *card) |
1704 | { | |
1705 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) | |
1706 | return 1; | |
1707 | return 0; | |
1708 | } | |
1709 | EXPORT_SYMBOL(mmc_can_sanitize); | |
1710 | ||
dfe86cba AH |
1711 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
1712 | { | |
1713 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
1714 | return 1; | |
1715 | return 0; | |
1716 | } | |
1717 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
1718 | ||
1719 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
1720 | unsigned int nr) | |
1721 | { | |
1722 | if (!card->erase_size) | |
1723 | return 0; | |
1724 | if (from % card->erase_size || nr % card->erase_size) | |
1725 | return 0; | |
1726 | return 1; | |
1727 | } | |
1728 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 1729 | |
e056a1b5 AH |
1730 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
1731 | unsigned int arg) | |
1732 | { | |
1733 | struct mmc_host *host = card->host; | |
1734 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
1735 | unsigned int last_timeout = 0; | |
1736 | ||
1737 | if (card->erase_shift) | |
1738 | max_qty = UINT_MAX >> card->erase_shift; | |
1739 | else if (mmc_card_sd(card)) | |
1740 | max_qty = UINT_MAX; | |
1741 | else | |
1742 | max_qty = UINT_MAX / card->erase_size; | |
1743 | ||
1744 | /* Find the largest qty with an OK timeout */ | |
1745 | do { | |
1746 | y = 0; | |
1747 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
1748 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
1749 | if (timeout > host->max_discard_to) | |
1750 | break; | |
1751 | if (timeout < last_timeout) | |
1752 | break; | |
1753 | last_timeout = timeout; | |
1754 | y = x; | |
1755 | } | |
1756 | qty += y; | |
1757 | } while (y); | |
1758 | ||
1759 | if (!qty) | |
1760 | return 0; | |
1761 | ||
1762 | if (qty == 1) | |
1763 | return 1; | |
1764 | ||
1765 | /* Convert qty to sectors */ | |
1766 | if (card->erase_shift) | |
1767 | max_discard = --qty << card->erase_shift; | |
1768 | else if (mmc_card_sd(card)) | |
1769 | max_discard = qty; | |
1770 | else | |
1771 | max_discard = --qty * card->erase_size; | |
1772 | ||
1773 | return max_discard; | |
1774 | } | |
1775 | ||
1776 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
1777 | { | |
1778 | struct mmc_host *host = card->host; | |
1779 | unsigned int max_discard, max_trim; | |
1780 | ||
1781 | if (!host->max_discard_to) | |
1782 | return UINT_MAX; | |
1783 | ||
1784 | /* | |
1785 | * Without erase_group_def set, MMC erase timeout depends on clock | |
1786 | * frequence which can change. In that case, the best choice is | |
1787 | * just the preferred erase size. | |
1788 | */ | |
1789 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
1790 | return card->pref_erase; | |
1791 | ||
1792 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
1793 | if (mmc_can_trim(card)) { | |
1794 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
1795 | if (max_trim < max_discard) | |
1796 | max_discard = max_trim; | |
1797 | } else if (max_discard < card->erase_size) { | |
1798 | max_discard = 0; | |
1799 | } | |
1800 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
1801 | mmc_hostname(host), max_discard, host->max_discard_to); | |
1802 | return max_discard; | |
1803 | } | |
1804 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
1805 | ||
0f8d8ea6 AH |
1806 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
1807 | { | |
1278dba1 | 1808 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
1809 | |
1810 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
1811 | return 0; | |
1812 | ||
0f8d8ea6 AH |
1813 | cmd.opcode = MMC_SET_BLOCKLEN; |
1814 | cmd.arg = blocklen; | |
1815 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1816 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
1817 | } | |
1818 | EXPORT_SYMBOL(mmc_set_blocklen); | |
1819 | ||
b2499518 AH |
1820 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
1821 | { | |
1822 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
1823 | return; | |
1824 | mmc_host_clk_hold(host); | |
1825 | host->ops->hw_reset(host); | |
1826 | mmc_host_clk_release(host); | |
1827 | } | |
1828 | ||
1829 | int mmc_can_reset(struct mmc_card *card) | |
1830 | { | |
1831 | u8 rst_n_function; | |
1832 | ||
1833 | if (!mmc_card_mmc(card)) | |
1834 | return 0; | |
1835 | rst_n_function = card->ext_csd.rst_n_function; | |
1836 | if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED) | |
1837 | return 0; | |
1838 | return 1; | |
1839 | } | |
1840 | EXPORT_SYMBOL(mmc_can_reset); | |
1841 | ||
1842 | static int mmc_do_hw_reset(struct mmc_host *host, int check) | |
1843 | { | |
1844 | struct mmc_card *card = host->card; | |
1845 | ||
1846 | if (!host->bus_ops->power_restore) | |
1847 | return -EOPNOTSUPP; | |
1848 | ||
1849 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
1850 | return -EOPNOTSUPP; | |
1851 | ||
1852 | if (!card) | |
1853 | return -EINVAL; | |
1854 | ||
1855 | if (!mmc_can_reset(card)) | |
1856 | return -EOPNOTSUPP; | |
1857 | ||
1858 | mmc_host_clk_hold(host); | |
1859 | mmc_set_clock(host, host->f_init); | |
1860 | ||
1861 | host->ops->hw_reset(host); | |
1862 | ||
1863 | /* If the reset has happened, then a status command will fail */ | |
1864 | if (check) { | |
1865 | struct mmc_command cmd = {0}; | |
1866 | int err; | |
1867 | ||
1868 | cmd.opcode = MMC_SEND_STATUS; | |
1869 | if (!mmc_host_is_spi(card->host)) | |
1870 | cmd.arg = card->rca << 16; | |
1871 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
1872 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1873 | if (!err) { | |
1874 | mmc_host_clk_release(host); | |
1875 | return -ENOSYS; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR); | |
1880 | if (mmc_host_is_spi(host)) { | |
1881 | host->ios.chip_select = MMC_CS_HIGH; | |
1882 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1883 | } else { | |
1884 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1885 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1886 | } | |
1887 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
1888 | host->ios.timing = MMC_TIMING_LEGACY; | |
1889 | mmc_set_ios(host); | |
1890 | ||
1891 | mmc_host_clk_release(host); | |
1892 | ||
1893 | return host->bus_ops->power_restore(host); | |
1894 | } | |
1895 | ||
1896 | int mmc_hw_reset(struct mmc_host *host) | |
1897 | { | |
1898 | return mmc_do_hw_reset(host, 0); | |
1899 | } | |
1900 | EXPORT_SYMBOL(mmc_hw_reset); | |
1901 | ||
1902 | int mmc_hw_reset_check(struct mmc_host *host) | |
1903 | { | |
1904 | return mmc_do_hw_reset(host, 1); | |
1905 | } | |
1906 | EXPORT_SYMBOL(mmc_hw_reset_check); | |
1907 | ||
807e8e40 AR |
1908 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
1909 | { | |
1910 | host->f_init = freq; | |
1911 | ||
1912 | #ifdef CONFIG_MMC_DEBUG | |
1913 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
1914 | mmc_hostname(host), __func__, host->f_init); | |
1915 | #endif | |
1916 | mmc_power_up(host); | |
2f94e55a | 1917 | |
b2499518 AH |
1918 | /* |
1919 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
1920 | * do a hardware reset if possible. | |
1921 | */ | |
1922 | mmc_hw_reset_for_init(host); | |
1923 | ||
e7747475 UH |
1924 | /* Initialization should be done at 3.3 V I/O voltage. */ |
1925 | mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); | |
1926 | ||
2f94e55a PR |
1927 | /* |
1928 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
1929 | * if the card is being re-initialized, just send it. CMD52 | |
1930 | * should be ignored by SD/eMMC cards. | |
1931 | */ | |
807e8e40 AR |
1932 | sdio_reset(host); |
1933 | mmc_go_idle(host); | |
1934 | ||
1935 | mmc_send_if_cond(host, host->ocr_avail); | |
1936 | ||
1937 | /* Order's important: probe SDIO, then SD, then MMC */ | |
1938 | if (!mmc_attach_sdio(host)) | |
1939 | return 0; | |
1940 | if (!mmc_attach_sd(host)) | |
1941 | return 0; | |
1942 | if (!mmc_attach_mmc(host)) | |
1943 | return 0; | |
1944 | ||
1945 | mmc_power_off(host); | |
1946 | return -EIO; | |
1947 | } | |
1948 | ||
d3049504 AH |
1949 | int _mmc_detect_card_removed(struct mmc_host *host) |
1950 | { | |
1951 | int ret; | |
1952 | ||
1953 | if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive) | |
1954 | return 0; | |
1955 | ||
1956 | if (!host->card || mmc_card_removed(host->card)) | |
1957 | return 1; | |
1958 | ||
1959 | ret = host->bus_ops->alive(host); | |
1960 | if (ret) { | |
1961 | mmc_card_set_removed(host->card); | |
1962 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
1963 | } | |
1964 | ||
1965 | return ret; | |
1966 | } | |
1967 | ||
1968 | int mmc_detect_card_removed(struct mmc_host *host) | |
1969 | { | |
1970 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 1971 | int ret; |
d3049504 AH |
1972 | |
1973 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
1974 | |
1975 | if (!card) | |
1976 | return 1; | |
1977 | ||
1978 | ret = mmc_card_removed(card); | |
d3049504 AH |
1979 | /* |
1980 | * The card will be considered unchanged unless we have been asked to | |
1981 | * detect a change or host requires polling to provide card detection. | |
1982 | */ | |
f0cc9cf9 UH |
1983 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL) && |
1984 | !(host->caps2 & MMC_CAP2_DETECT_ON_ERR)) | |
1985 | return ret; | |
d3049504 AH |
1986 | |
1987 | host->detect_change = 0; | |
f0cc9cf9 UH |
1988 | if (!ret) { |
1989 | ret = _mmc_detect_card_removed(host); | |
1990 | if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) { | |
1991 | /* | |
1992 | * Schedule a detect work as soon as possible to let a | |
1993 | * rescan handle the card removal. | |
1994 | */ | |
1995 | cancel_delayed_work(&host->detect); | |
1996 | mmc_detect_change(host, 0); | |
1997 | } | |
1998 | } | |
d3049504 | 1999 | |
f0cc9cf9 | 2000 | return ret; |
d3049504 AH |
2001 | } |
2002 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2003 | ||
b93931a6 | 2004 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2005 | { |
807e8e40 | 2006 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
c4028958 DH |
2007 | struct mmc_host *host = |
2008 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2009 | int i; |
4c2ef25f | 2010 | |
807e8e40 | 2011 | if (host->rescan_disable) |
4c2ef25f | 2012 | return; |
1da177e4 | 2013 | |
7ea239d9 | 2014 | mmc_bus_get(host); |
b855885e | 2015 | |
30201e7f OBC |
2016 | /* |
2017 | * if there is a _removable_ card registered, check whether it is | |
2018 | * still present | |
2019 | */ | |
2020 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 2021 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
2022 | host->bus_ops->detect(host); |
2023 | ||
d3049504 AH |
2024 | host->detect_change = 0; |
2025 | ||
c5841798 CB |
2026 | /* |
2027 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2028 | * the card is no longer present. | |
2029 | */ | |
94d89efb | 2030 | mmc_bus_put(host); |
94d89efb JS |
2031 | mmc_bus_get(host); |
2032 | ||
2033 | /* if there still is a card present, stop here */ | |
2034 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2035 | mmc_bus_put(host); |
94d89efb JS |
2036 | goto out; |
2037 | } | |
1da177e4 | 2038 | |
94d89efb JS |
2039 | /* |
2040 | * Only we can add a new handler, so it's safe to | |
2041 | * release the lock here. | |
2042 | */ | |
2043 | mmc_bus_put(host); | |
1da177e4 | 2044 | |
94d89efb JS |
2045 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) |
2046 | goto out; | |
1da177e4 | 2047 | |
807e8e40 | 2048 | mmc_claim_host(host); |
88ae8b86 | 2049 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2050 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2051 | break; | |
06b2233a | 2052 | if (freqs[i] <= host->f_min) |
807e8e40 | 2053 | break; |
88ae8b86 | 2054 | } |
807e8e40 AR |
2055 | mmc_release_host(host); |
2056 | ||
2057 | out: | |
28f52482 AV |
2058 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2059 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2060 | } |
2061 | ||
b93931a6 | 2062 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2063 | { |
b93931a6 PO |
2064 | mmc_power_off(host); |
2065 | mmc_detect_change(host, 0); | |
1da177e4 LT |
2066 | } |
2067 | ||
b93931a6 | 2068 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2069 | { |
3b91e550 | 2070 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2071 | unsigned long flags; |
2072 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2073 | host->removed = 1; |
1efd48b3 | 2074 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
2075 | #endif |
2076 | ||
d9bcbf34 | 2077 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
2078 | mmc_flush_scheduled_work(); |
2079 | ||
da68c4eb NP |
2080 | /* clear pm flags now and let card drivers set them as needed */ |
2081 | host->pm_flags = 0; | |
2082 | ||
7ea239d9 PO |
2083 | mmc_bus_get(host); |
2084 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2085 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
7ea239d9 PO |
2086 | if (host->bus_ops->remove) |
2087 | host->bus_ops->remove(host); | |
2088 | ||
2089 | mmc_claim_host(host); | |
2090 | mmc_detach_bus(host); | |
7f7e4129 | 2091 | mmc_power_off(host); |
7ea239d9 | 2092 | mmc_release_host(host); |
53509f0f DK |
2093 | mmc_bus_put(host); |
2094 | return; | |
1da177e4 | 2095 | } |
7ea239d9 PO |
2096 | mmc_bus_put(host); |
2097 | ||
2098 | BUG_ON(host->card); | |
1da177e4 LT |
2099 | |
2100 | mmc_power_off(host); | |
2101 | } | |
2102 | ||
12ae637f | 2103 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2104 | { |
12ae637f OBC |
2105 | int ret = 0; |
2106 | ||
bb9cab94 DD |
2107 | #ifdef CONFIG_MMC_DEBUG |
2108 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2109 | #endif | |
2110 | ||
eae1aeee AH |
2111 | mmc_bus_get(host); |
2112 | ||
2113 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2114 | mmc_bus_put(host); | |
12ae637f | 2115 | return -EINVAL; |
eae1aeee AH |
2116 | } |
2117 | ||
2118 | if (host->bus_ops->power_save) | |
12ae637f | 2119 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2120 | |
2121 | mmc_bus_put(host); | |
2122 | ||
2123 | mmc_power_off(host); | |
12ae637f OBC |
2124 | |
2125 | return ret; | |
eae1aeee AH |
2126 | } |
2127 | EXPORT_SYMBOL(mmc_power_save_host); | |
2128 | ||
12ae637f | 2129 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2130 | { |
12ae637f OBC |
2131 | int ret; |
2132 | ||
bb9cab94 DD |
2133 | #ifdef CONFIG_MMC_DEBUG |
2134 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2135 | #endif | |
2136 | ||
eae1aeee AH |
2137 | mmc_bus_get(host); |
2138 | ||
2139 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2140 | mmc_bus_put(host); | |
12ae637f | 2141 | return -EINVAL; |
eae1aeee AH |
2142 | } |
2143 | ||
2144 | mmc_power_up(host); | |
12ae637f | 2145 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2146 | |
2147 | mmc_bus_put(host); | |
12ae637f OBC |
2148 | |
2149 | return ret; | |
eae1aeee AH |
2150 | } |
2151 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2152 | ||
b1ebe384 JL |
2153 | int mmc_card_awake(struct mmc_host *host) |
2154 | { | |
2155 | int err = -ENOSYS; | |
2156 | ||
aa9df4fb UH |
2157 | if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) |
2158 | return 0; | |
2159 | ||
b1ebe384 JL |
2160 | mmc_bus_get(host); |
2161 | ||
2162 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
2163 | err = host->bus_ops->awake(host); | |
2164 | ||
2165 | mmc_bus_put(host); | |
2166 | ||
2167 | return err; | |
2168 | } | |
2169 | EXPORT_SYMBOL(mmc_card_awake); | |
2170 | ||
2171 | int mmc_card_sleep(struct mmc_host *host) | |
2172 | { | |
2173 | int err = -ENOSYS; | |
2174 | ||
aa9df4fb UH |
2175 | if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) |
2176 | return 0; | |
2177 | ||
b1ebe384 JL |
2178 | mmc_bus_get(host); |
2179 | ||
c99872a1 | 2180 | if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep) |
b1ebe384 JL |
2181 | err = host->bus_ops->sleep(host); |
2182 | ||
2183 | mmc_bus_put(host); | |
2184 | ||
2185 | return err; | |
2186 | } | |
2187 | EXPORT_SYMBOL(mmc_card_sleep); | |
2188 | ||
2189 | int mmc_card_can_sleep(struct mmc_host *host) | |
2190 | { | |
2191 | struct mmc_card *card = host->card; | |
2192 | ||
2193 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
2194 | return 1; | |
2195 | return 0; | |
2196 | } | |
2197 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
2198 | ||
881d1c25 SJ |
2199 | /* |
2200 | * Flush the cache to the non-volatile storage. | |
2201 | */ | |
2202 | int mmc_flush_cache(struct mmc_card *card) | |
2203 | { | |
2204 | struct mmc_host *host = card->host; | |
2205 | int err = 0; | |
2206 | ||
2207 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL)) | |
2208 | return err; | |
2209 | ||
2210 | if (mmc_card_mmc(card) && | |
2211 | (card->ext_csd.cache_size > 0) && | |
2212 | (card->ext_csd.cache_ctrl & 1)) { | |
2213 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2214 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2215 | if (err) | |
2216 | pr_err("%s: cache flush error %d\n", | |
2217 | mmc_hostname(card->host), err); | |
2218 | } | |
2219 | ||
2220 | return err; | |
2221 | } | |
2222 | EXPORT_SYMBOL(mmc_flush_cache); | |
2223 | ||
2224 | /* | |
2225 | * Turn the cache ON/OFF. | |
2226 | * Turning the cache OFF shall trigger flushing of the data | |
2227 | * to the non-volatile storage. | |
2228 | */ | |
2229 | int mmc_cache_ctrl(struct mmc_host *host, u8 enable) | |
2230 | { | |
2231 | struct mmc_card *card = host->card; | |
8bc0678b | 2232 | unsigned int timeout; |
881d1c25 SJ |
2233 | int err = 0; |
2234 | ||
2235 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) || | |
2236 | mmc_card_is_removable(host)) | |
2237 | return err; | |
2238 | ||
2239 | if (card && mmc_card_mmc(card) && | |
2240 | (card->ext_csd.cache_size > 0)) { | |
2241 | enable = !!enable; | |
2242 | ||
8bc0678b SJ |
2243 | if (card->ext_csd.cache_ctrl ^ enable) { |
2244 | timeout = enable ? card->ext_csd.generic_cmd6_time : 0; | |
881d1c25 | 2245 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
8bc0678b SJ |
2246 | EXT_CSD_CACHE_CTRL, enable, timeout); |
2247 | if (err) | |
2248 | pr_err("%s: cache %s error %d\n", | |
2249 | mmc_hostname(card->host), | |
2250 | enable ? "on" : "off", | |
2251 | err); | |
2252 | else | |
2253 | card->ext_csd.cache_ctrl = enable; | |
2254 | } | |
881d1c25 SJ |
2255 | } |
2256 | ||
2257 | return err; | |
2258 | } | |
2259 | EXPORT_SYMBOL(mmc_cache_ctrl); | |
2260 | ||
1da177e4 LT |
2261 | #ifdef CONFIG_PM |
2262 | ||
2263 | /** | |
2264 | * mmc_suspend_host - suspend a host | |
2265 | * @host: mmc host | |
1da177e4 | 2266 | */ |
1a13f8fa | 2267 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 2268 | { |
95cdfb72 NP |
2269 | int err = 0; |
2270 | ||
7de427d0 | 2271 | cancel_delayed_work(&host->detect); |
b5af25be | 2272 | mmc_flush_scheduled_work(); |
17e9ff55 SJ |
2273 | if (mmc_try_claim_host(host)) { |
2274 | err = mmc_cache_ctrl(host, 0); | |
907d2e7c | 2275 | mmc_release_host(host); |
17e9ff55 SJ |
2276 | } else { |
2277 | err = -EBUSY; | |
2278 | } | |
2279 | ||
881d1c25 SJ |
2280 | if (err) |
2281 | goto out; | |
b5af25be | 2282 | |
7ea239d9 PO |
2283 | mmc_bus_get(host); |
2284 | if (host->bus_ops && !host->bus_dead) { | |
b6ad726e UH |
2285 | |
2286 | /* | |
2287 | * A long response time is not acceptable for device drivers | |
2288 | * when doing suspend. Prevent mmc_claim_host in the suspend | |
2289 | * sequence, to potentially wait "forever" by trying to | |
2290 | * pre-claim the host. | |
2291 | */ | |
2292 | if (mmc_try_claim_host(host)) { | |
a80f1627 | 2293 | if (host->bus_ops->suspend) { |
b6ad726e | 2294 | err = host->bus_ops->suspend(host); |
a80f1627 | 2295 | } |
907d2e7c | 2296 | mmc_release_host(host); |
49df7807 | 2297 | |
b6ad726e UH |
2298 | if (err == -ENOSYS || !host->bus_ops->resume) { |
2299 | /* | |
2300 | * We simply "remove" the card in this case. | |
0db13fc2 GL |
2301 | * It will be redetected on resume. (Calling |
2302 | * bus_ops->remove() with a claimed host can | |
2303 | * deadlock.) | |
b6ad726e UH |
2304 | */ |
2305 | if (host->bus_ops->remove) | |
2306 | host->bus_ops->remove(host); | |
2307 | mmc_claim_host(host); | |
2308 | mmc_detach_bus(host); | |
2309 | mmc_power_off(host); | |
2310 | mmc_release_host(host); | |
2311 | host->pm_flags = 0; | |
2312 | err = 0; | |
2313 | } | |
b6ad726e UH |
2314 | } else { |
2315 | err = -EBUSY; | |
1c8cf9c9 | 2316 | } |
b5af25be | 2317 | } |
7ea239d9 PO |
2318 | mmc_bus_put(host); |
2319 | ||
a5e9425d | 2320 | if (!err && !mmc_card_keep_power(host)) |
95cdfb72 | 2321 | mmc_power_off(host); |
1da177e4 | 2322 | |
881d1c25 | 2323 | out: |
95cdfb72 | 2324 | return err; |
1da177e4 LT |
2325 | } |
2326 | ||
2327 | EXPORT_SYMBOL(mmc_suspend_host); | |
2328 | ||
2329 | /** | |
2330 | * mmc_resume_host - resume a previously suspended host | |
2331 | * @host: mmc host | |
2332 | */ | |
2333 | int mmc_resume_host(struct mmc_host *host) | |
2334 | { | |
95cdfb72 NP |
2335 | int err = 0; |
2336 | ||
6abaa0c9 PO |
2337 | mmc_bus_get(host); |
2338 | if (host->bus_ops && !host->bus_dead) { | |
a5e9425d | 2339 | if (!mmc_card_keep_power(host)) { |
da68c4eb NP |
2340 | mmc_power_up(host); |
2341 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
2342 | /* |
2343 | * Tell runtime PM core we just powered up the card, | |
2344 | * since it still believes the card is powered off. | |
2345 | * Note that currently runtime PM is only enabled | |
2346 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
2347 | */ | |
2348 | if (mmc_card_sdio(host->card) && | |
2349 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
2350 | pm_runtime_disable(&host->card->dev); | |
2351 | pm_runtime_set_active(&host->card->dev); | |
2352 | pm_runtime_enable(&host->card->dev); | |
2353 | } | |
da68c4eb | 2354 | } |
6abaa0c9 | 2355 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
2356 | err = host->bus_ops->resume(host); |
2357 | if (err) { | |
a3c76eb9 | 2358 | pr_warning("%s: error %d during resume " |
95cdfb72 NP |
2359 | "(card was removed?)\n", |
2360 | mmc_hostname(host), err); | |
95cdfb72 NP |
2361 | err = 0; |
2362 | } | |
6abaa0c9 | 2363 | } |
a8e6df73 | 2364 | host->pm_flags &= ~MMC_PM_KEEP_POWER; |
6abaa0c9 PO |
2365 | mmc_bus_put(host); |
2366 | ||
95cdfb72 | 2367 | return err; |
1da177e4 | 2368 | } |
1da177e4 LT |
2369 | EXPORT_SYMBOL(mmc_resume_host); |
2370 | ||
4c2ef25f ML |
2371 | /* Do the card removal on suspend if card is assumed removeable |
2372 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2373 | to sync the card. | |
2374 | */ | |
2375 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2376 | unsigned long mode, void *unused) | |
2377 | { | |
2378 | struct mmc_host *host = container_of( | |
2379 | notify_block, struct mmc_host, pm_notify); | |
2380 | unsigned long flags; | |
2381 | ||
2382 | ||
2383 | switch (mode) { | |
2384 | case PM_HIBERNATION_PREPARE: | |
2385 | case PM_SUSPEND_PREPARE: | |
2386 | ||
2387 | spin_lock_irqsave(&host->lock, flags); | |
2388 | host->rescan_disable = 1; | |
bec8726a | 2389 | host->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT; |
4c2ef25f ML |
2390 | spin_unlock_irqrestore(&host->lock, flags); |
2391 | cancel_delayed_work_sync(&host->detect); | |
2392 | ||
2393 | if (!host->bus_ops || host->bus_ops->suspend) | |
2394 | break; | |
2395 | ||
0db13fc2 | 2396 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
4c2ef25f ML |
2397 | if (host->bus_ops->remove) |
2398 | host->bus_ops->remove(host); | |
2399 | ||
0db13fc2 | 2400 | mmc_claim_host(host); |
4c2ef25f | 2401 | mmc_detach_bus(host); |
7f7e4129 | 2402 | mmc_power_off(host); |
4c2ef25f ML |
2403 | mmc_release_host(host); |
2404 | host->pm_flags = 0; | |
2405 | break; | |
2406 | ||
2407 | case PM_POST_SUSPEND: | |
2408 | case PM_POST_HIBERNATION: | |
274476f8 | 2409 | case PM_POST_RESTORE: |
4c2ef25f ML |
2410 | |
2411 | spin_lock_irqsave(&host->lock, flags); | |
2412 | host->rescan_disable = 0; | |
bec8726a | 2413 | host->power_notify_type = MMC_HOST_PW_NOTIFY_LONG; |
4c2ef25f ML |
2414 | spin_unlock_irqrestore(&host->lock, flags); |
2415 | mmc_detect_change(host, 0); | |
2416 | ||
2417 | } | |
2418 | ||
2419 | return 0; | |
2420 | } | |
1da177e4 LT |
2421 | #endif |
2422 | ||
ffce2e7e PO |
2423 | static int __init mmc_init(void) |
2424 | { | |
2425 | int ret; | |
2426 | ||
0d9ee5b2 | 2427 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2428 | if (!workqueue) |
2429 | return -ENOMEM; | |
2430 | ||
2431 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2432 | if (ret) |
2433 | goto destroy_workqueue; | |
2434 | ||
2435 | ret = mmc_register_host_class(); | |
2436 | if (ret) | |
2437 | goto unregister_bus; | |
2438 | ||
2439 | ret = sdio_register_bus(); | |
2440 | if (ret) | |
2441 | goto unregister_host_class; | |
2442 | ||
2443 | return 0; | |
2444 | ||
2445 | unregister_host_class: | |
2446 | mmc_unregister_host_class(); | |
2447 | unregister_bus: | |
2448 | mmc_unregister_bus(); | |
2449 | destroy_workqueue: | |
2450 | destroy_workqueue(workqueue); | |
2451 | ||
ffce2e7e PO |
2452 | return ret; |
2453 | } | |
2454 | ||
2455 | static void __exit mmc_exit(void) | |
2456 | { | |
e29a7d73 | 2457 | sdio_unregister_bus(); |
ffce2e7e PO |
2458 | mmc_unregister_host_class(); |
2459 | mmc_unregister_bus(); | |
2460 | destroy_workqueue(workqueue); | |
2461 | } | |
2462 | ||
26074962 | 2463 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2464 | module_exit(mmc_exit); |
2465 | ||
1da177e4 | 2466 | MODULE_LICENSE("GPL"); |