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> | |
950d56ac | 29 | #include <linux/slab.h> |
1da177e4 LT |
30 | |
31 | #include <linux/mmc/card.h> | |
32 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
33 | #include <linux/mmc/mmc.h> |
34 | #include <linux/mmc/sd.h> | |
1da177e4 | 35 | |
aaac1b47 | 36 | #include "core.h" |
ffce2e7e PO |
37 | #include "bus.h" |
38 | #include "host.h" | |
e29a7d73 | 39 | #include "sdio_bus.h" |
da7fbe58 PO |
40 | |
41 | #include "mmc_ops.h" | |
42 | #include "sd_ops.h" | |
5c4e6f13 | 43 | #include "sdio_ops.h" |
1da177e4 | 44 | |
8fee476b TR |
45 | /* If the device is not responding */ |
46 | #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */ | |
47 | ||
950d56ac JC |
48 | /* |
49 | * Background operations can take a long time, depending on the housekeeping | |
50 | * operations the card has to perform. | |
51 | */ | |
52 | #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */ | |
53 | ||
ffce2e7e | 54 | static struct workqueue_struct *workqueue; |
fa550189 | 55 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 56 | |
af517150 DB |
57 | /* |
58 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
59 | * performance cost, and for other reasons may not always be desired. | |
60 | * So we allow it it to be disabled. | |
61 | */ | |
90ab5ee9 | 62 | bool use_spi_crc = 1; |
af517150 DB |
63 | module_param(use_spi_crc, bool, 0); |
64 | ||
bd68e083 BH |
65 | /* |
66 | * We normally treat cards as removed during suspend if they are not | |
67 | * known to be on a non-removable bus, to avoid the risk of writing | |
68 | * back data to a different card after resume. Allow this to be | |
69 | * overridden if necessary. | |
70 | */ | |
71 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
90ab5ee9 | 72 | bool mmc_assume_removable; |
bd68e083 | 73 | #else |
90ab5ee9 | 74 | bool mmc_assume_removable = 1; |
bd68e083 | 75 | #endif |
71d7d3d1 | 76 | EXPORT_SYMBOL(mmc_assume_removable); |
bd68e083 BH |
77 | module_param_named(removable, mmc_assume_removable, bool, 0644); |
78 | MODULE_PARM_DESC( | |
79 | removable, | |
80 | "MMC/SD cards are removable and may be removed during suspend"); | |
81 | ||
ffce2e7e PO |
82 | /* |
83 | * Internal function. Schedule delayed work in the MMC work queue. | |
84 | */ | |
85 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
86 | unsigned long delay) | |
87 | { | |
88 | return queue_delayed_work(workqueue, work, delay); | |
89 | } | |
90 | ||
91 | /* | |
92 | * Internal function. Flush all scheduled work from the MMC work queue. | |
93 | */ | |
94 | static void mmc_flush_scheduled_work(void) | |
95 | { | |
96 | flush_workqueue(workqueue); | |
97 | } | |
98 | ||
1b676f70 PF |
99 | #ifdef CONFIG_FAIL_MMC_REQUEST |
100 | ||
101 | /* | |
102 | * Internal function. Inject random data errors. | |
103 | * If mmc_data is NULL no errors are injected. | |
104 | */ | |
105 | static void mmc_should_fail_request(struct mmc_host *host, | |
106 | struct mmc_request *mrq) | |
107 | { | |
108 | struct mmc_command *cmd = mrq->cmd; | |
109 | struct mmc_data *data = mrq->data; | |
110 | static const int data_errors[] = { | |
111 | -ETIMEDOUT, | |
112 | -EILSEQ, | |
113 | -EIO, | |
114 | }; | |
115 | ||
116 | if (!data) | |
117 | return; | |
118 | ||
119 | if (cmd->error || data->error || | |
120 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
121 | return; | |
122 | ||
2e744fcb AM |
123 | data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)]; |
124 | data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9; | |
1b676f70 PF |
125 | } |
126 | ||
127 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
128 | ||
129 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
130 | struct mmc_request *mrq) | |
131 | { | |
132 | } | |
133 | ||
134 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
135 | ||
1da177e4 | 136 | /** |
fe10c6ab RK |
137 | * mmc_request_done - finish processing an MMC request |
138 | * @host: MMC host which completed request | |
139 | * @mrq: MMC request which request | |
1da177e4 LT |
140 | * |
141 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 142 | * their processing of a request. |
1da177e4 LT |
143 | */ |
144 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
145 | { | |
146 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
147 | int err = cmd->error; |
148 | ||
af517150 DB |
149 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
150 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
151 | cmd->retries = 0; | |
152 | } | |
153 | ||
d3049504 | 154 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
155 | /* |
156 | * Request starter must handle retries - see | |
157 | * mmc_wait_for_req_done(). | |
158 | */ | |
159 | if (mrq->done) | |
160 | mrq->done(mrq); | |
e4d21708 | 161 | } else { |
1b676f70 PF |
162 | mmc_should_fail_request(host, mrq); |
163 | ||
af8350c7 PO |
164 | led_trigger_event(host->led, LED_OFF); |
165 | ||
e4d21708 PO |
166 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
167 | mmc_hostname(host), cmd->opcode, err, | |
168 | cmd->resp[0], cmd->resp[1], | |
169 | cmd->resp[2], cmd->resp[3]); | |
170 | ||
171 | if (mrq->data) { | |
172 | pr_debug("%s: %d bytes transferred: %d\n", | |
173 | mmc_hostname(host), | |
174 | mrq->data->bytes_xfered, mrq->data->error); | |
175 | } | |
176 | ||
177 | if (mrq->stop) { | |
178 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
179 | mmc_hostname(host), mrq->stop->opcode, | |
180 | mrq->stop->error, | |
181 | mrq->stop->resp[0], mrq->stop->resp[1], | |
182 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
183 | } | |
184 | ||
185 | if (mrq->done) | |
186 | mrq->done(mrq); | |
04566831 | 187 | |
08c14071 | 188 | mmc_host_clk_release(host); |
1da177e4 LT |
189 | } |
190 | } | |
191 | ||
192 | EXPORT_SYMBOL(mmc_request_done); | |
193 | ||
39361851 | 194 | static void |
1da177e4 LT |
195 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
196 | { | |
976d9276 PO |
197 | #ifdef CONFIG_MMC_DEBUG |
198 | unsigned int i, sz; | |
a84756c5 | 199 | struct scatterlist *sg; |
976d9276 PO |
200 | #endif |
201 | ||
7b2fd4f2 JC |
202 | if (mrq->sbc) { |
203 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
204 | mmc_hostname(host), mrq->sbc->opcode, | |
205 | mrq->sbc->arg, mrq->sbc->flags); | |
206 | } | |
207 | ||
920e70c5 RK |
208 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
209 | mmc_hostname(host), mrq->cmd->opcode, | |
210 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 211 | |
e4d21708 PO |
212 | if (mrq->data) { |
213 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
214 | "tsac %d ms nsac %d\n", | |
215 | mmc_hostname(host), mrq->data->blksz, | |
216 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 217 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
218 | mrq->data->timeout_clks); |
219 | } | |
220 | ||
221 | if (mrq->stop) { | |
222 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
223 | mmc_hostname(host), mrq->stop->opcode, | |
224 | mrq->stop->arg, mrq->stop->flags); | |
225 | } | |
226 | ||
f22ee4ed | 227 | WARN_ON(!host->claimed); |
1da177e4 LT |
228 | |
229 | mrq->cmd->error = 0; | |
230 | mrq->cmd->mrq = mrq; | |
231 | if (mrq->data) { | |
fe4a3c7a | 232 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
233 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
234 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
235 | host->max_req_size); | |
fe4a3c7a | 236 | |
976d9276 PO |
237 | #ifdef CONFIG_MMC_DEBUG |
238 | sz = 0; | |
a84756c5 PO |
239 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
240 | sz += sg->length; | |
976d9276 PO |
241 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
242 | #endif | |
243 | ||
1da177e4 LT |
244 | mrq->cmd->data = mrq->data; |
245 | mrq->data->error = 0; | |
246 | mrq->data->mrq = mrq; | |
247 | if (mrq->stop) { | |
248 | mrq->data->stop = mrq->stop; | |
249 | mrq->stop->error = 0; | |
250 | mrq->stop->mrq = mrq; | |
251 | } | |
252 | } | |
08c14071 | 253 | mmc_host_clk_hold(host); |
66c036e0 | 254 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
255 | host->ops->request(host, mrq); |
256 | } | |
257 | ||
950d56ac JC |
258 | /** |
259 | * mmc_start_bkops - start BKOPS for supported cards | |
260 | * @card: MMC card to start BKOPS | |
261 | * @form_exception: A flag to indicate if this function was | |
262 | * called due to an exception raised by the card | |
263 | * | |
264 | * Start background operations whenever requested. | |
265 | * When the urgent BKOPS bit is set in a R1 command response | |
266 | * then background operations should be started immediately. | |
267 | */ | |
268 | void mmc_start_bkops(struct mmc_card *card, bool from_exception) | |
269 | { | |
270 | int err; | |
271 | int timeout; | |
272 | bool use_busy_signal; | |
273 | ||
274 | BUG_ON(!card); | |
275 | ||
276 | if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card)) | |
277 | return; | |
278 | ||
279 | err = mmc_read_bkops_status(card); | |
280 | if (err) { | |
281 | pr_err("%s: Failed to read bkops status: %d\n", | |
282 | mmc_hostname(card->host), err); | |
283 | return; | |
284 | } | |
285 | ||
286 | if (!card->ext_csd.raw_bkops_status) | |
287 | return; | |
288 | ||
289 | if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 && | |
290 | from_exception) | |
291 | return; | |
292 | ||
293 | mmc_claim_host(card->host); | |
294 | if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) { | |
295 | timeout = MMC_BKOPS_MAX_TIMEOUT; | |
296 | use_busy_signal = true; | |
297 | } else { | |
298 | timeout = 0; | |
299 | use_busy_signal = false; | |
300 | } | |
301 | ||
302 | err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
303 | EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal); | |
304 | if (err) { | |
305 | pr_warn("%s: Error %d starting bkops\n", | |
306 | mmc_hostname(card->host), err); | |
307 | goto out; | |
308 | } | |
309 | ||
310 | /* | |
311 | * For urgent bkops status (LEVEL_2 and more) | |
312 | * bkops executed synchronously, otherwise | |
313 | * the operation is in progress | |
314 | */ | |
315 | if (!use_busy_signal) | |
316 | mmc_card_set_doing_bkops(card); | |
317 | out: | |
318 | mmc_release_host(card->host); | |
319 | } | |
320 | EXPORT_SYMBOL(mmc_start_bkops); | |
321 | ||
2220eedf KD |
322 | /* |
323 | * mmc_wait_data_done() - done callback for data request | |
324 | * @mrq: done data request | |
325 | * | |
326 | * Wakes up mmc context, passed as a callback to host controller driver | |
327 | */ | |
328 | static void mmc_wait_data_done(struct mmc_request *mrq) | |
329 | { | |
330 | mrq->host->context_info.is_done_rcv = true; | |
331 | wake_up_interruptible(&mrq->host->context_info.wait); | |
332 | } | |
333 | ||
1da177e4 LT |
334 | static void mmc_wait_done(struct mmc_request *mrq) |
335 | { | |
aa8b683a PF |
336 | complete(&mrq->completion); |
337 | } | |
338 | ||
2220eedf KD |
339 | /* |
340 | *__mmc_start_data_req() - starts data request | |
341 | * @host: MMC host to start the request | |
342 | * @mrq: data request to start | |
343 | * | |
344 | * Sets the done callback to be called when request is completed by the card. | |
345 | * Starts data mmc request execution | |
346 | */ | |
347 | static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq) | |
348 | { | |
349 | mrq->done = mmc_wait_data_done; | |
350 | mrq->host = host; | |
351 | if (mmc_card_removed(host->card)) { | |
352 | mrq->cmd->error = -ENOMEDIUM; | |
9b844961 | 353 | mmc_wait_data_done(mrq); |
2220eedf KD |
354 | return -ENOMEDIUM; |
355 | } | |
356 | mmc_start_request(host, mrq); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
956d9fd5 | 361 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a PF |
362 | { |
363 | init_completion(&mrq->completion); | |
364 | mrq->done = mmc_wait_done; | |
d3049504 AH |
365 | if (mmc_card_removed(host->card)) { |
366 | mrq->cmd->error = -ENOMEDIUM; | |
367 | complete(&mrq->completion); | |
956d9fd5 | 368 | return -ENOMEDIUM; |
d3049504 | 369 | } |
aa8b683a | 370 | mmc_start_request(host, mrq); |
956d9fd5 | 371 | return 0; |
aa8b683a PF |
372 | } |
373 | ||
2220eedf KD |
374 | /* |
375 | * mmc_wait_for_data_req_done() - wait for request completed | |
376 | * @host: MMC host to prepare the command. | |
377 | * @mrq: MMC request to wait for | |
378 | * | |
379 | * Blocks MMC context till host controller will ack end of data request | |
380 | * execution or new request notification arrives from the block layer. | |
381 | * Handles command retries. | |
382 | * | |
383 | * Returns enum mmc_blk_status after checking errors. | |
384 | */ | |
385 | static int mmc_wait_for_data_req_done(struct mmc_host *host, | |
386 | struct mmc_request *mrq, | |
387 | struct mmc_async_req *next_req) | |
388 | { | |
389 | struct mmc_command *cmd; | |
390 | struct mmc_context_info *context_info = &host->context_info; | |
391 | int err; | |
392 | unsigned long flags; | |
393 | ||
394 | while (1) { | |
395 | wait_event_interruptible(context_info->wait, | |
396 | (context_info->is_done_rcv || | |
397 | context_info->is_new_req)); | |
398 | spin_lock_irqsave(&context_info->lock, flags); | |
399 | context_info->is_waiting_last_req = false; | |
400 | spin_unlock_irqrestore(&context_info->lock, flags); | |
401 | if (context_info->is_done_rcv) { | |
402 | context_info->is_done_rcv = false; | |
403 | context_info->is_new_req = false; | |
404 | cmd = mrq->cmd; | |
405 | if (!cmd->error || !cmd->retries || | |
406 | mmc_card_removed(host->card)) { | |
407 | err = host->areq->err_check(host->card, | |
408 | host->areq); | |
409 | break; /* return err */ | |
410 | } else { | |
411 | pr_info("%s: req failed (CMD%u): %d, retrying...\n", | |
412 | mmc_hostname(host), | |
413 | cmd->opcode, cmd->error); | |
414 | cmd->retries--; | |
415 | cmd->error = 0; | |
416 | host->ops->request(host, mrq); | |
417 | continue; /* wait for done/new event again */ | |
418 | } | |
419 | } else if (context_info->is_new_req) { | |
420 | context_info->is_new_req = false; | |
421 | if (!next_req) { | |
422 | err = MMC_BLK_NEW_REQUEST; | |
423 | break; /* return err */ | |
424 | } | |
425 | } | |
426 | } | |
427 | return err; | |
428 | } | |
429 | ||
aa8b683a PF |
430 | static void mmc_wait_for_req_done(struct mmc_host *host, |
431 | struct mmc_request *mrq) | |
432 | { | |
08a7e1df AH |
433 | struct mmc_command *cmd; |
434 | ||
435 | while (1) { | |
436 | wait_for_completion(&mrq->completion); | |
437 | ||
438 | cmd = mrq->cmd; | |
d3049504 AH |
439 | if (!cmd->error || !cmd->retries || |
440 | mmc_card_removed(host->card)) | |
08a7e1df AH |
441 | break; |
442 | ||
443 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
444 | mmc_hostname(host), cmd->opcode, cmd->error); | |
445 | cmd->retries--; | |
446 | cmd->error = 0; | |
447 | host->ops->request(host, mrq); | |
448 | } | |
aa8b683a PF |
449 | } |
450 | ||
451 | /** | |
452 | * mmc_pre_req - Prepare for a new request | |
453 | * @host: MMC host to prepare command | |
454 | * @mrq: MMC request to prepare for | |
455 | * @is_first_req: true if there is no previous started request | |
456 | * that may run in parellel to this call, otherwise false | |
457 | * | |
458 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
459 | * host prepare for the new request. Preparation of a request may be | |
460 | * performed while another request is running on the host. | |
461 | */ | |
462 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
463 | bool is_first_req) | |
464 | { | |
2c4967f7 SRT |
465 | if (host->ops->pre_req) { |
466 | mmc_host_clk_hold(host); | |
aa8b683a | 467 | host->ops->pre_req(host, mrq, is_first_req); |
2c4967f7 SRT |
468 | mmc_host_clk_release(host); |
469 | } | |
aa8b683a PF |
470 | } |
471 | ||
472 | /** | |
473 | * mmc_post_req - Post process a completed request | |
474 | * @host: MMC host to post process command | |
475 | * @mrq: MMC request to post process for | |
476 | * @err: Error, if non zero, clean up any resources made in pre_req | |
477 | * | |
478 | * Let the host post process a completed request. Post processing of | |
479 | * a request may be performed while another reuqest is running. | |
480 | */ | |
481 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
482 | int err) | |
483 | { | |
2c4967f7 SRT |
484 | if (host->ops->post_req) { |
485 | mmc_host_clk_hold(host); | |
aa8b683a | 486 | host->ops->post_req(host, mrq, err); |
2c4967f7 SRT |
487 | mmc_host_clk_release(host); |
488 | } | |
1da177e4 LT |
489 | } |
490 | ||
aa8b683a PF |
491 | /** |
492 | * mmc_start_req - start a non-blocking request | |
493 | * @host: MMC host to start command | |
494 | * @areq: async request to start | |
495 | * @error: out parameter returns 0 for success, otherwise non zero | |
496 | * | |
497 | * Start a new MMC custom command request for a host. | |
498 | * If there is on ongoing async request wait for completion | |
499 | * of that request and start the new one and return. | |
500 | * Does not wait for the new request to complete. | |
501 | * | |
502 | * Returns the completed request, NULL in case of none completed. | |
503 | * Wait for the an ongoing request (previoulsy started) to complete and | |
504 | * return the completed request. If there is no ongoing request, NULL | |
505 | * is returned without waiting. NULL is not an error condition. | |
506 | */ | |
507 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
508 | struct mmc_async_req *areq, int *error) | |
509 | { | |
510 | int err = 0; | |
956d9fd5 | 511 | int start_err = 0; |
aa8b683a PF |
512 | struct mmc_async_req *data = host->areq; |
513 | ||
514 | /* Prepare a new request */ | |
515 | if (areq) | |
516 | mmc_pre_req(host, areq->mrq, !host->areq); | |
517 | ||
518 | if (host->areq) { | |
f5c2758f JC |
519 | err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq); |
520 | if (err == MMC_BLK_NEW_REQUEST) { | |
521 | if (error) | |
522 | *error = err; | |
523 | /* | |
524 | * The previous request was not completed, | |
525 | * nothing to return | |
526 | */ | |
527 | return NULL; | |
528 | } | |
950d56ac JC |
529 | /* |
530 | * Check BKOPS urgency for each R1 response | |
531 | */ | |
532 | if (host->card && mmc_card_mmc(host->card) && | |
533 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
534 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
535 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) | |
536 | mmc_start_bkops(host->card, true); | |
aa8b683a PF |
537 | } |
538 | ||
956d9fd5 | 539 | if (!err && areq) |
2220eedf | 540 | start_err = __mmc_start_data_req(host, areq->mrq); |
aa8b683a PF |
541 | |
542 | if (host->areq) | |
543 | mmc_post_req(host, host->areq->mrq, 0); | |
544 | ||
956d9fd5 UH |
545 | /* Cancel a prepared request if it was not started. */ |
546 | if ((err || start_err) && areq) | |
f5c2758f | 547 | mmc_post_req(host, areq->mrq, -EINVAL); |
956d9fd5 UH |
548 | |
549 | if (err) | |
550 | host->areq = NULL; | |
551 | else | |
552 | host->areq = areq; | |
553 | ||
aa8b683a PF |
554 | if (error) |
555 | *error = err; | |
556 | return data; | |
557 | } | |
558 | EXPORT_SYMBOL(mmc_start_req); | |
559 | ||
67a61c48 PO |
560 | /** |
561 | * mmc_wait_for_req - start a request and wait for completion | |
562 | * @host: MMC host to start command | |
563 | * @mrq: MMC request to start | |
564 | * | |
565 | * Start a new MMC custom command request for a host, and wait | |
566 | * for the command to complete. Does not attempt to parse the | |
567 | * response. | |
568 | */ | |
569 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 570 | { |
aa8b683a PF |
571 | __mmc_start_req(host, mrq); |
572 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 573 | } |
1da177e4 LT |
574 | EXPORT_SYMBOL(mmc_wait_for_req); |
575 | ||
eb0d8f13 JC |
576 | /** |
577 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
578 | * @card: the MMC card associated with the HPI transfer | |
579 | * | |
580 | * Issued High Priority Interrupt, and check for card status | |
950d56ac | 581 | * until out-of prg-state. |
eb0d8f13 JC |
582 | */ |
583 | int mmc_interrupt_hpi(struct mmc_card *card) | |
584 | { | |
585 | int err; | |
586 | u32 status; | |
6af9e96e | 587 | unsigned long prg_wait; |
eb0d8f13 JC |
588 | |
589 | BUG_ON(!card); | |
590 | ||
591 | if (!card->ext_csd.hpi_en) { | |
592 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
593 | return 1; | |
594 | } | |
595 | ||
596 | mmc_claim_host(card->host); | |
597 | err = mmc_send_status(card, &status); | |
598 | if (err) { | |
599 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
600 | goto out; | |
601 | } | |
602 | ||
6af9e96e V |
603 | switch (R1_CURRENT_STATE(status)) { |
604 | case R1_STATE_IDLE: | |
605 | case R1_STATE_READY: | |
606 | case R1_STATE_STBY: | |
211d4fe5 | 607 | case R1_STATE_TRAN: |
6af9e96e | 608 | /* |
211d4fe5 | 609 | * In idle and transfer states, HPI is not needed and the caller |
6af9e96e V |
610 | * can issue the next intended command immediately |
611 | */ | |
612 | goto out; | |
613 | case R1_STATE_PRG: | |
614 | break; | |
615 | default: | |
616 | /* In all other states, it's illegal to issue HPI */ | |
617 | pr_debug("%s: HPI cannot be sent. Card state=%d\n", | |
618 | mmc_hostname(card->host), R1_CURRENT_STATE(status)); | |
619 | err = -EINVAL; | |
620 | goto out; | |
621 | } | |
622 | ||
623 | err = mmc_send_hpi_cmd(card, &status); | |
624 | if (err) | |
625 | goto out; | |
626 | ||
627 | prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time); | |
628 | do { | |
629 | err = mmc_send_status(card, &status); | |
630 | ||
631 | if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN) | |
632 | break; | |
633 | if (time_after(jiffies, prg_wait)) | |
634 | err = -ETIMEDOUT; | |
635 | } while (!err); | |
eb0d8f13 JC |
636 | |
637 | out: | |
638 | mmc_release_host(card->host); | |
639 | return err; | |
640 | } | |
641 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
642 | ||
1da177e4 LT |
643 | /** |
644 | * mmc_wait_for_cmd - start a command and wait for completion | |
645 | * @host: MMC host to start command | |
646 | * @cmd: MMC command to start | |
647 | * @retries: maximum number of retries | |
648 | * | |
649 | * Start a new MMC command for a host, and wait for the command | |
650 | * to complete. Return any error that occurred while the command | |
651 | * was executing. Do not attempt to parse the response. | |
652 | */ | |
653 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
654 | { | |
ad5fd972 | 655 | struct mmc_request mrq = {NULL}; |
1da177e4 | 656 | |
d84075c8 | 657 | WARN_ON(!host->claimed); |
1da177e4 | 658 | |
1da177e4 LT |
659 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
660 | cmd->retries = retries; | |
661 | ||
662 | mrq.cmd = cmd; | |
663 | cmd->data = NULL; | |
664 | ||
665 | mmc_wait_for_req(host, &mrq); | |
666 | ||
667 | return cmd->error; | |
668 | } | |
669 | ||
670 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
671 | ||
950d56ac JC |
672 | /** |
673 | * mmc_stop_bkops - stop ongoing BKOPS | |
674 | * @card: MMC card to check BKOPS | |
675 | * | |
676 | * Send HPI command to stop ongoing background operations to | |
677 | * allow rapid servicing of foreground operations, e.g. read/ | |
678 | * writes. Wait until the card comes out of the programming state | |
679 | * to avoid errors in servicing read/write requests. | |
680 | */ | |
681 | int mmc_stop_bkops(struct mmc_card *card) | |
682 | { | |
683 | int err = 0; | |
684 | ||
685 | BUG_ON(!card); | |
686 | err = mmc_interrupt_hpi(card); | |
687 | ||
688 | /* | |
689 | * If err is EINVAL, we can't issue an HPI. | |
690 | * It should complete the BKOPS. | |
691 | */ | |
692 | if (!err || (err == -EINVAL)) { | |
693 | mmc_card_clr_doing_bkops(card); | |
694 | err = 0; | |
695 | } | |
696 | ||
697 | return err; | |
698 | } | |
699 | EXPORT_SYMBOL(mmc_stop_bkops); | |
700 | ||
701 | int mmc_read_bkops_status(struct mmc_card *card) | |
702 | { | |
703 | int err; | |
704 | u8 *ext_csd; | |
705 | ||
706 | /* | |
707 | * In future work, we should consider storing the entire ext_csd. | |
708 | */ | |
709 | ext_csd = kmalloc(512, GFP_KERNEL); | |
710 | if (!ext_csd) { | |
711 | pr_err("%s: could not allocate buffer to receive the ext_csd.\n", | |
712 | mmc_hostname(card->host)); | |
713 | return -ENOMEM; | |
714 | } | |
715 | ||
716 | mmc_claim_host(card->host); | |
717 | err = mmc_send_ext_csd(card, ext_csd); | |
718 | mmc_release_host(card->host); | |
719 | if (err) | |
720 | goto out; | |
721 | ||
722 | card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; | |
723 | card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS]; | |
724 | out: | |
725 | kfree(ext_csd); | |
726 | return err; | |
727 | } | |
728 | EXPORT_SYMBOL(mmc_read_bkops_status); | |
729 | ||
d773d725 RK |
730 | /** |
731 | * mmc_set_data_timeout - set the timeout for a data command | |
732 | * @data: data phase for command | |
733 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
734 | * |
735 | * Computes the data timeout parameters according to the | |
736 | * correct algorithm given the card type. | |
d773d725 | 737 | */ |
b146d26a | 738 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
739 | { |
740 | unsigned int mult; | |
741 | ||
e6f918bf PO |
742 | /* |
743 | * SDIO cards only define an upper 1 s limit on access. | |
744 | */ | |
745 | if (mmc_card_sdio(card)) { | |
746 | data->timeout_ns = 1000000000; | |
747 | data->timeout_clks = 0; | |
748 | return; | |
749 | } | |
750 | ||
d773d725 RK |
751 | /* |
752 | * SD cards use a 100 multiplier rather than 10 | |
753 | */ | |
754 | mult = mmc_card_sd(card) ? 100 : 10; | |
755 | ||
756 | /* | |
757 | * Scale up the multiplier (and therefore the timeout) by | |
758 | * the r2w factor for writes. | |
759 | */ | |
b146d26a | 760 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
761 | mult <<= card->csd.r2w_factor; |
762 | ||
763 | data->timeout_ns = card->csd.tacc_ns * mult; | |
764 | data->timeout_clks = card->csd.tacc_clks * mult; | |
765 | ||
766 | /* | |
767 | * SD cards also have an upper limit on the timeout. | |
768 | */ | |
769 | if (mmc_card_sd(card)) { | |
770 | unsigned int timeout_us, limit_us; | |
771 | ||
772 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
773 | if (mmc_host_clk_rate(card->host)) |
774 | timeout_us += data->timeout_clks * 1000 / | |
775 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 776 | |
b146d26a | 777 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 778 | /* |
3bdc9ba8 PW |
779 | * The MMC spec "It is strongly recommended |
780 | * for hosts to implement more than 500ms | |
781 | * timeout value even if the card indicates | |
782 | * the 250ms maximum busy length." Even the | |
783 | * previous value of 300ms is known to be | |
784 | * insufficient for some cards. | |
493890e7 | 785 | */ |
3bdc9ba8 | 786 | limit_us = 3000000; |
d773d725 RK |
787 | else |
788 | limit_us = 100000; | |
789 | ||
fba68bd2 PL |
790 | /* |
791 | * SDHC cards always use these fixed values. | |
792 | */ | |
793 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
794 | data->timeout_ns = limit_us * 1000; |
795 | data->timeout_clks = 0; | |
796 | } | |
797 | } | |
6de5fc9c SNX |
798 | |
799 | /* | |
800 | * Some cards require longer data read timeout than indicated in CSD. | |
801 | * Address this by setting the read timeout to a "reasonably high" | |
802 | * value. For the cards tested, 300ms has proven enough. If necessary, | |
803 | * this value can be increased if other problematic cards require this. | |
804 | */ | |
805 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
806 | data->timeout_ns = 300000000; | |
807 | data->timeout_clks = 0; | |
808 | } | |
809 | ||
c0c88871 WM |
810 | /* |
811 | * Some cards need very high timeouts if driven in SPI mode. | |
812 | * The worst observed timeout was 900ms after writing a | |
813 | * continuous stream of data until the internal logic | |
814 | * overflowed. | |
815 | */ | |
816 | if (mmc_host_is_spi(card->host)) { | |
817 | if (data->flags & MMC_DATA_WRITE) { | |
818 | if (data->timeout_ns < 1000000000) | |
819 | data->timeout_ns = 1000000000; /* 1s */ | |
820 | } else { | |
821 | if (data->timeout_ns < 100000000) | |
822 | data->timeout_ns = 100000000; /* 100ms */ | |
823 | } | |
824 | } | |
d773d725 RK |
825 | } |
826 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
827 | ||
ad3868b2 PO |
828 | /** |
829 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
830 | * @card: the MMC card associated with the data transfer | |
831 | * @sz: original transfer size | |
832 | * | |
833 | * Pads the original data size with a number of extra bytes in | |
834 | * order to avoid controller bugs and/or performance hits | |
835 | * (e.g. some controllers revert to PIO for certain sizes). | |
836 | * | |
837 | * Returns the improved size, which might be unmodified. | |
838 | * | |
839 | * Note that this function is only relevant when issuing a | |
840 | * single scatter gather entry. | |
841 | */ | |
842 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
843 | { | |
844 | /* | |
845 | * FIXME: We don't have a system for the controller to tell | |
846 | * the core about its problems yet, so for now we just 32-bit | |
847 | * align the size. | |
848 | */ | |
849 | sz = ((sz + 3) / 4) * 4; | |
850 | ||
851 | return sz; | |
852 | } | |
853 | EXPORT_SYMBOL(mmc_align_data_size); | |
854 | ||
1da177e4 | 855 | /** |
2342f332 | 856 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 857 | * @host: mmc host to claim |
2342f332 | 858 | * @abort: whether or not the operation should be aborted |
1da177e4 | 859 | * |
2342f332 NP |
860 | * Claim a host for a set of operations. If @abort is non null and |
861 | * dereference a non-zero value then this will return prematurely with | |
862 | * that non-zero value without acquiring the lock. Returns zero | |
863 | * with the lock held otherwise. | |
1da177e4 | 864 | */ |
2342f332 | 865 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
866 | { |
867 | DECLARE_WAITQUEUE(wait, current); | |
868 | unsigned long flags; | |
2342f332 | 869 | int stop; |
1da177e4 | 870 | |
cf795bfb PO |
871 | might_sleep(); |
872 | ||
1da177e4 LT |
873 | add_wait_queue(&host->wq, &wait); |
874 | spin_lock_irqsave(&host->lock, flags); | |
875 | while (1) { | |
876 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 877 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 878 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
879 | break; |
880 | spin_unlock_irqrestore(&host->lock, flags); | |
881 | schedule(); | |
882 | spin_lock_irqsave(&host->lock, flags); | |
883 | } | |
884 | set_current_state(TASK_RUNNING); | |
319a3f14 | 885 | if (!stop) { |
2342f332 | 886 | host->claimed = 1; |
319a3f14 AH |
887 | host->claimer = current; |
888 | host->claim_cnt += 1; | |
889 | } else | |
2342f332 | 890 | wake_up(&host->wq); |
1da177e4 LT |
891 | spin_unlock_irqrestore(&host->lock, flags); |
892 | remove_wait_queue(&host->wq, &wait); | |
907d2e7c AH |
893 | if (host->ops->enable && !stop && host->claim_cnt == 1) |
894 | host->ops->enable(host); | |
2342f332 | 895 | return stop; |
1da177e4 LT |
896 | } |
897 | ||
2342f332 | 898 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 899 | |
319a3f14 AH |
900 | /** |
901 | * mmc_try_claim_host - try exclusively to claim a host | |
902 | * @host: mmc host to claim | |
903 | * | |
904 | * Returns %1 if the host is claimed, %0 otherwise. | |
905 | */ | |
906 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
907 | { |
908 | int claimed_host = 0; | |
909 | unsigned long flags; | |
910 | ||
911 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 912 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 913 | host->claimed = 1; |
319a3f14 AH |
914 | host->claimer = current; |
915 | host->claim_cnt += 1; | |
8ea926b2 AH |
916 | claimed_host = 1; |
917 | } | |
918 | spin_unlock_irqrestore(&host->lock, flags); | |
907d2e7c AH |
919 | if (host->ops->enable && claimed_host && host->claim_cnt == 1) |
920 | host->ops->enable(host); | |
8ea926b2 AH |
921 | return claimed_host; |
922 | } | |
319a3f14 | 923 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 924 | |
ab1efd27 | 925 | /** |
907d2e7c | 926 | * mmc_release_host - release a host |
ab1efd27 UH |
927 | * @host: mmc host to release |
928 | * | |
907d2e7c AH |
929 | * Release a MMC host, allowing others to claim the host |
930 | * for their operations. | |
ab1efd27 | 931 | */ |
907d2e7c | 932 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
933 | { |
934 | unsigned long flags; | |
935 | ||
907d2e7c AH |
936 | WARN_ON(!host->claimed); |
937 | ||
938 | if (host->ops->disable && host->claim_cnt == 1) | |
939 | host->ops->disable(host); | |
940 | ||
8ea926b2 | 941 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
942 | if (--host->claim_cnt) { |
943 | /* Release for nested claim */ | |
944 | spin_unlock_irqrestore(&host->lock, flags); | |
945 | } else { | |
946 | host->claimed = 0; | |
947 | host->claimer = NULL; | |
948 | spin_unlock_irqrestore(&host->lock, flags); | |
949 | wake_up(&host->wq); | |
950 | } | |
8ea926b2 | 951 | } |
1da177e4 LT |
952 | EXPORT_SYMBOL(mmc_release_host); |
953 | ||
7ea239d9 PO |
954 | /* |
955 | * Internal function that does the actual ios call to the host driver, | |
956 | * optionally printing some debug output. | |
957 | */ | |
920e70c5 RK |
958 | static inline void mmc_set_ios(struct mmc_host *host) |
959 | { | |
960 | struct mmc_ios *ios = &host->ios; | |
961 | ||
cd9277c0 PO |
962 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
963 | "width %u timing %u\n", | |
920e70c5 RK |
964 | mmc_hostname(host), ios->clock, ios->bus_mode, |
965 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 966 | ios->bus_width, ios->timing); |
fba68bd2 | 967 | |
04566831 LW |
968 | if (ios->clock > 0) |
969 | mmc_set_ungated(host); | |
920e70c5 RK |
970 | host->ops->set_ios(host, ios); |
971 | } | |
972 | ||
7ea239d9 PO |
973 | /* |
974 | * Control chip select pin on a host. | |
975 | */ | |
da7fbe58 | 976 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 977 | { |
778e277c | 978 | mmc_host_clk_hold(host); |
da7fbe58 PO |
979 | host->ios.chip_select = mode; |
980 | mmc_set_ios(host); | |
778e277c | 981 | mmc_host_clk_release(host); |
1da177e4 LT |
982 | } |
983 | ||
7ea239d9 PO |
984 | /* |
985 | * Sets the host clock to the highest possible frequency that | |
986 | * is below "hz". | |
987 | */ | |
778e277c | 988 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
989 | { |
990 | WARN_ON(hz < host->f_min); | |
991 | ||
992 | if (hz > host->f_max) | |
993 | hz = host->f_max; | |
994 | ||
995 | host->ios.clock = hz; | |
996 | mmc_set_ios(host); | |
997 | } | |
998 | ||
778e277c MW |
999 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
1000 | { | |
1001 | mmc_host_clk_hold(host); | |
1002 | __mmc_set_clock(host, hz); | |
1003 | mmc_host_clk_release(host); | |
1004 | } | |
1005 | ||
04566831 LW |
1006 | #ifdef CONFIG_MMC_CLKGATE |
1007 | /* | |
1008 | * This gates the clock by setting it to 0 Hz. | |
1009 | */ | |
1010 | void mmc_gate_clock(struct mmc_host *host) | |
1011 | { | |
1012 | unsigned long flags; | |
1013 | ||
1014 | spin_lock_irqsave(&host->clk_lock, flags); | |
1015 | host->clk_old = host->ios.clock; | |
1016 | host->ios.clock = 0; | |
1017 | host->clk_gated = true; | |
1018 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
1019 | mmc_set_ios(host); | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * This restores the clock from gating by using the cached | |
1024 | * clock value. | |
1025 | */ | |
1026 | void mmc_ungate_clock(struct mmc_host *host) | |
1027 | { | |
1028 | /* | |
1029 | * We should previously have gated the clock, so the clock shall | |
1030 | * be 0 here! The clock may however be 0 during initialization, | |
1031 | * when some request operations are performed before setting | |
1032 | * the frequency. When ungate is requested in that situation | |
1033 | * we just ignore the call. | |
1034 | */ | |
1035 | if (host->clk_old) { | |
1036 | BUG_ON(host->ios.clock); | |
1037 | /* This call will also set host->clk_gated to false */ | |
778e277c | 1038 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
1039 | } |
1040 | } | |
1041 | ||
1042 | void mmc_set_ungated(struct mmc_host *host) | |
1043 | { | |
1044 | unsigned long flags; | |
1045 | ||
1046 | /* | |
1047 | * We've been given a new frequency while the clock is gated, | |
1048 | * so make sure we regard this as ungating it. | |
1049 | */ | |
1050 | spin_lock_irqsave(&host->clk_lock, flags); | |
1051 | host->clk_gated = false; | |
1052 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
1053 | } | |
1054 | ||
1055 | #else | |
1056 | void mmc_set_ungated(struct mmc_host *host) | |
1057 | { | |
1058 | } | |
1059 | #endif | |
1060 | ||
7ea239d9 PO |
1061 | /* |
1062 | * Change the bus mode (open drain/push-pull) of a host. | |
1063 | */ | |
1064 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
1065 | { | |
778e277c | 1066 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1067 | host->ios.bus_mode = mode; |
1068 | mmc_set_ios(host); | |
778e277c | 1069 | mmc_host_clk_release(host); |
7ea239d9 PO |
1070 | } |
1071 | ||
0f8d8ea6 AH |
1072 | /* |
1073 | * Change data bus width of a host. | |
1074 | */ | |
1075 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
1076 | { | |
778e277c | 1077 | mmc_host_clk_hold(host); |
4c4cb171 PR |
1078 | host->ios.bus_width = width; |
1079 | mmc_set_ios(host); | |
778e277c | 1080 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
1081 | } |
1082 | ||
86e8286a AV |
1083 | /** |
1084 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
1085 | * @vdd: voltage (mV) | |
1086 | * @low_bits: prefer low bits in boundary cases | |
1087 | * | |
1088 | * This function returns the OCR bit number according to the provided @vdd | |
1089 | * value. If conversion is not possible a negative errno value returned. | |
1090 | * | |
1091 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
1092 | * on boundary voltages. For example, | |
1093 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
1094 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
1095 | * | |
1096 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
1097 | */ | |
1098 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
1099 | { | |
1100 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1101 | int bit; | |
1102 | ||
1103 | if (vdd < 1650 || vdd > 3600) | |
1104 | return -EINVAL; | |
1105 | ||
1106 | if (vdd >= 1650 && vdd <= 1950) | |
1107 | return ilog2(MMC_VDD_165_195); | |
1108 | ||
1109 | if (low_bits) | |
1110 | vdd -= 1; | |
1111 | ||
1112 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1113 | bit = (vdd - 2000) / 100 + 8; | |
1114 | if (bit > max_bit) | |
1115 | return max_bit; | |
1116 | return bit; | |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1121 | * @vdd_min: minimum voltage value (mV) | |
1122 | * @vdd_max: maximum voltage value (mV) | |
1123 | * | |
1124 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1125 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1126 | * | |
1127 | * Notes wrt boundary cases: | |
1128 | * This function sets the OCR bits for all boundary voltages, for example | |
1129 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1130 | * MMC_VDD_34_35 mask. | |
1131 | */ | |
1132 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1133 | { | |
1134 | u32 mask = 0; | |
1135 | ||
1136 | if (vdd_max < vdd_min) | |
1137 | return 0; | |
1138 | ||
1139 | /* Prefer high bits for the boundary vdd_max values. */ | |
1140 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1141 | if (vdd_max < 0) | |
1142 | return 0; | |
1143 | ||
1144 | /* Prefer low bits for the boundary vdd_min values. */ | |
1145 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1146 | if (vdd_min < 0) | |
1147 | return 0; | |
1148 | ||
1149 | /* Fill the mask, from max bit to min bit. */ | |
1150 | while (vdd_max >= vdd_min) | |
1151 | mask |= 1 << vdd_max--; | |
1152 | ||
1153 | return mask; | |
1154 | } | |
1155 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1156 | ||
5c13941a DB |
1157 | #ifdef CONFIG_REGULATOR |
1158 | ||
1159 | /** | |
1160 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1161 | * @supply: regulator to use | |
1162 | * | |
1163 | * This returns either a negative errno, or a mask of voltages that | |
1164 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1165 | * regulator. This would normally be called before registering the | |
1166 | * MMC host adapter. | |
1167 | */ | |
1168 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1169 | { | |
1170 | int result = 0; | |
1171 | int count; | |
1172 | int i; | |
1173 | ||
1174 | count = regulator_count_voltages(supply); | |
1175 | if (count < 0) | |
1176 | return count; | |
1177 | ||
1178 | for (i = 0; i < count; i++) { | |
1179 | int vdd_uV; | |
1180 | int vdd_mV; | |
1181 | ||
1182 | vdd_uV = regulator_list_voltage(supply, i); | |
1183 | if (vdd_uV <= 0) | |
1184 | continue; | |
1185 | ||
1186 | vdd_mV = vdd_uV / 1000; | |
1187 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1188 | } | |
1189 | ||
1190 | return result; | |
1191 | } | |
45a6b32e | 1192 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1193 | |
1194 | /** | |
1195 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1196 | * @mmc: the host to regulate |
5c13941a | 1197 | * @supply: regulator to use |
99fc5131 | 1198 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1199 | * |
1200 | * Returns zero on success, else negative errno. | |
1201 | * | |
1202 | * MMC host drivers may use this to enable or disable a regulator using | |
1203 | * a particular supply voltage. This would normally be called from the | |
1204 | * set_ios() method. | |
1205 | */ | |
99fc5131 LW |
1206 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1207 | struct regulator *supply, | |
1208 | unsigned short vdd_bit) | |
5c13941a DB |
1209 | { |
1210 | int result = 0; | |
1211 | int min_uV, max_uV; | |
5c13941a DB |
1212 | |
1213 | if (vdd_bit) { | |
1214 | int tmp; | |
1215 | int voltage; | |
1216 | ||
9cde5b7a CB |
1217 | /* |
1218 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
5c13941a DB |
1219 | * bits this regulator doesn't quite support ... don't |
1220 | * be too picky, most cards and regulators are OK with | |
1221 | * a 0.1V range goof (it's a small error percentage). | |
1222 | */ | |
1223 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1224 | if (tmp == 0) { | |
1225 | min_uV = 1650 * 1000; | |
1226 | max_uV = 1950 * 1000; | |
1227 | } else { | |
1228 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1229 | max_uV = min_uV + 100 * 1000; | |
1230 | } | |
1231 | ||
9cde5b7a CB |
1232 | /* |
1233 | * If we're using a fixed/static regulator, don't call | |
1234 | * regulator_set_voltage; it would fail. | |
5c13941a DB |
1235 | */ |
1236 | voltage = regulator_get_voltage(supply); | |
6e8201f5 | 1237 | |
5f56a8e6 | 1238 | if (!regulator_can_change_voltage(supply)) |
6e8201f5 JC |
1239 | min_uV = max_uV = voltage; |
1240 | ||
5c13941a DB |
1241 | if (voltage < 0) |
1242 | result = voltage; | |
1243 | else if (voltage < min_uV || voltage > max_uV) | |
1244 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
1245 | else | |
1246 | result = 0; | |
1247 | ||
99fc5131 | 1248 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1249 | result = regulator_enable(supply); |
99fc5131 LW |
1250 | if (!result) |
1251 | mmc->regulator_enabled = true; | |
1252 | } | |
1253 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1254 | result = regulator_disable(supply); |
99fc5131 LW |
1255 | if (result == 0) |
1256 | mmc->regulator_enabled = false; | |
5c13941a DB |
1257 | } |
1258 | ||
99fc5131 LW |
1259 | if (result) |
1260 | dev_err(mmc_dev(mmc), | |
1261 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1262 | return result; |
1263 | } | |
45a6b32e | 1264 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1265 | |
e137788d GL |
1266 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1267 | { | |
1268 | struct device *dev = mmc_dev(mmc); | |
1269 | struct regulator *supply; | |
1270 | int ret; | |
1271 | ||
1272 | supply = devm_regulator_get(dev, "vmmc"); | |
1273 | mmc->supply.vmmc = supply; | |
1274 | mmc->supply.vqmmc = devm_regulator_get(dev, "vqmmc"); | |
1275 | ||
1276 | if (IS_ERR(supply)) | |
1277 | return PTR_ERR(supply); | |
1278 | ||
1279 | ret = mmc_regulator_get_ocrmask(supply); | |
1280 | if (ret > 0) | |
1281 | mmc->ocr_avail = ret; | |
1282 | else | |
1283 | dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret); | |
1284 | ||
1285 | return 0; | |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1288 | ||
99fc5131 | 1289 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1290 | |
1da177e4 LT |
1291 | /* |
1292 | * Mask off any voltages we don't support and select | |
1293 | * the lowest voltage | |
1294 | */ | |
7ea239d9 | 1295 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1296 | { |
1297 | int bit; | |
1298 | ||
1299 | ocr &= host->ocr_avail; | |
1300 | ||
1301 | bit = ffs(ocr); | |
1302 | if (bit) { | |
1303 | bit -= 1; | |
1304 | ||
63ef731a | 1305 | ocr &= 3 << bit; |
1da177e4 | 1306 | |
778e277c | 1307 | mmc_host_clk_hold(host); |
1da177e4 | 1308 | host->ios.vdd = bit; |
920e70c5 | 1309 | mmc_set_ios(host); |
778e277c | 1310 | mmc_host_clk_release(host); |
1da177e4 | 1311 | } else { |
f6e10b86 DB |
1312 | pr_warning("%s: host doesn't support card's voltages\n", |
1313 | mmc_hostname(host)); | |
1da177e4 LT |
1314 | ocr = 0; |
1315 | } | |
1316 | ||
1317 | return ocr; | |
1318 | } | |
1319 | ||
567c8903 JR |
1320 | int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) |
1321 | { | |
1322 | int err = 0; | |
1323 | int old_signal_voltage = host->ios.signal_voltage; | |
1324 | ||
1325 | host->ios.signal_voltage = signal_voltage; | |
1326 | if (host->ops->start_signal_voltage_switch) { | |
1327 | mmc_host_clk_hold(host); | |
1328 | err = host->ops->start_signal_voltage_switch(host, &host->ios); | |
1329 | mmc_host_clk_release(host); | |
1330 | } | |
1331 | ||
1332 | if (err) | |
1333 | host->ios.signal_voltage = old_signal_voltage; | |
1334 | ||
1335 | return err; | |
1336 | ||
1337 | } | |
1338 | ||
1339 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) | |
f2119df6 AN |
1340 | { |
1341 | struct mmc_command cmd = {0}; | |
1342 | int err = 0; | |
0797e5f1 | 1343 | u32 clock; |
f2119df6 AN |
1344 | |
1345 | BUG_ON(!host); | |
1346 | ||
1347 | /* | |
1348 | * Send CMD11 only if the request is to switch the card to | |
1349 | * 1.8V signalling. | |
1350 | */ | |
0797e5f1 JR |
1351 | if (signal_voltage == MMC_SIGNAL_VOLTAGE_330) |
1352 | return __mmc_set_signal_voltage(host, signal_voltage); | |
f2119df6 | 1353 | |
0797e5f1 JR |
1354 | /* |
1355 | * If we cannot switch voltages, return failure so the caller | |
1356 | * can continue without UHS mode | |
1357 | */ | |
1358 | if (!host->ops->start_signal_voltage_switch) | |
1359 | return -EPERM; | |
1360 | if (!host->ops->card_busy) | |
1361 | pr_warning("%s: cannot verify signal voltage switch\n", | |
1362 | mmc_hostname(host)); | |
1363 | ||
1364 | cmd.opcode = SD_SWITCH_VOLTAGE; | |
1365 | cmd.arg = 0; | |
1366 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1367 | ||
1368 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1369 | if (err) | |
1370 | return err; | |
1371 | ||
1372 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1373 | return -EIO; | |
1374 | ||
1375 | mmc_host_clk_hold(host); | |
1376 | /* | |
1377 | * The card should drive cmd and dat[0:3] low immediately | |
1378 | * after the response of cmd11, but wait 1 ms to be sure | |
1379 | */ | |
1380 | mmc_delay(1); | |
1381 | if (host->ops->card_busy && !host->ops->card_busy(host)) { | |
1382 | err = -EAGAIN; | |
1383 | goto power_cycle; | |
1384 | } | |
1385 | /* | |
1386 | * During a signal voltage level switch, the clock must be gated | |
1387 | * for 5 ms according to the SD spec | |
1388 | */ | |
1389 | clock = host->ios.clock; | |
1390 | host->ios.clock = 0; | |
1391 | mmc_set_ios(host); | |
f2119df6 | 1392 | |
0797e5f1 JR |
1393 | if (__mmc_set_signal_voltage(host, signal_voltage)) { |
1394 | /* | |
1395 | * Voltages may not have been switched, but we've already | |
1396 | * sent CMD11, so a power cycle is required anyway | |
1397 | */ | |
1398 | err = -EAGAIN; | |
1399 | goto power_cycle; | |
f2119df6 AN |
1400 | } |
1401 | ||
0797e5f1 JR |
1402 | /* Keep clock gated for at least 5 ms */ |
1403 | mmc_delay(5); | |
1404 | host->ios.clock = clock; | |
1405 | mmc_set_ios(host); | |
1406 | ||
1407 | /* Wait for at least 1 ms according to spec */ | |
1408 | mmc_delay(1); | |
1409 | ||
1410 | /* | |
1411 | * Failure to switch is indicated by the card holding | |
1412 | * dat[0:3] low | |
1413 | */ | |
1414 | if (host->ops->card_busy && host->ops->card_busy(host)) | |
1415 | err = -EAGAIN; | |
1416 | ||
1417 | power_cycle: | |
1418 | if (err) { | |
1419 | pr_debug("%s: Signal voltage switch failed, " | |
1420 | "power cycling card\n", mmc_hostname(host)); | |
1421 | mmc_power_cycle(host); | |
1422 | } | |
1423 | ||
1424 | mmc_host_clk_release(host); | |
1425 | ||
1426 | return err; | |
f2119df6 AN |
1427 | } |
1428 | ||
b57c43ad | 1429 | /* |
7ea239d9 | 1430 | * Select timing parameters for host. |
b57c43ad | 1431 | */ |
7ea239d9 | 1432 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1433 | { |
778e277c | 1434 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1435 | host->ios.timing = timing; |
1436 | mmc_set_ios(host); | |
778e277c | 1437 | mmc_host_clk_release(host); |
b57c43ad PO |
1438 | } |
1439 | ||
d6d50a15 AN |
1440 | /* |
1441 | * Select appropriate driver type for host. | |
1442 | */ | |
1443 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1444 | { | |
778e277c | 1445 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1446 | host->ios.drv_type = drv_type; |
1447 | mmc_set_ios(host); | |
778e277c | 1448 | mmc_host_clk_release(host); |
d6d50a15 AN |
1449 | } |
1450 | ||
1da177e4 | 1451 | /* |
45f8245b RK |
1452 | * Apply power to the MMC stack. This is a two-stage process. |
1453 | * First, we enable power to the card without the clock running. | |
1454 | * We then wait a bit for the power to stabilise. Finally, | |
1455 | * enable the bus drivers and clock to the card. | |
1456 | * | |
1457 | * We must _NOT_ enable the clock prior to power stablising. | |
1458 | * | |
1459 | * If a host does all the power sequencing itself, ignore the | |
1460 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
1461 | */ |
1462 | static void mmc_power_up(struct mmc_host *host) | |
1463 | { | |
500f3564 BR |
1464 | int bit; |
1465 | ||
fa550189 UH |
1466 | if (host->ios.power_mode == MMC_POWER_ON) |
1467 | return; | |
1468 | ||
778e277c MW |
1469 | mmc_host_clk_hold(host); |
1470 | ||
500f3564 BR |
1471 | /* If ocr is set, we use it */ |
1472 | if (host->ocr) | |
1473 | bit = ffs(host->ocr) - 1; | |
1474 | else | |
1475 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1476 | |
1477 | host->ios.vdd = bit; | |
44669034 | 1478 | if (mmc_host_is_spi(host)) |
af517150 | 1479 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1480 | else |
af517150 | 1481 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1482 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1483 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1484 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1485 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1486 | mmc_set_ios(host); |
1da177e4 | 1487 | |
108ecc4c | 1488 | /* Set signal voltage to 3.3V */ |
567c8903 | 1489 | __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330); |
108ecc4c | 1490 | |
f9996aee PO |
1491 | /* |
1492 | * This delay should be sufficient to allow the power supply | |
1493 | * to reach the minimum voltage. | |
1494 | */ | |
79bccc5a | 1495 | mmc_delay(10); |
1da177e4 | 1496 | |
88ae8b86 | 1497 | host->ios.clock = host->f_init; |
8dfd0374 | 1498 | |
1da177e4 | 1499 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1500 | mmc_set_ios(host); |
1da177e4 | 1501 | |
f9996aee PO |
1502 | /* |
1503 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1504 | * time required to reach a stable voltage. | |
1505 | */ | |
79bccc5a | 1506 | mmc_delay(10); |
778e277c MW |
1507 | |
1508 | mmc_host_clk_release(host); | |
1da177e4 LT |
1509 | } |
1510 | ||
7f7e4129 | 1511 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1512 | { |
fa550189 UH |
1513 | if (host->ios.power_mode == MMC_POWER_OFF) |
1514 | return; | |
1515 | ||
778e277c MW |
1516 | mmc_host_clk_hold(host); |
1517 | ||
1da177e4 LT |
1518 | host->ios.clock = 0; |
1519 | host->ios.vdd = 0; | |
b33d46c3 | 1520 | |
bec8726a | 1521 | |
b33d46c3 UH |
1522 | /* |
1523 | * Reset ocr mask to be the highest possible voltage supported for | |
1524 | * this mmc host. This value will be used at next power up. | |
1525 | */ | |
1526 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1527 | ||
af517150 DB |
1528 | if (!mmc_host_is_spi(host)) { |
1529 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1530 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1531 | } | |
1da177e4 | 1532 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1533 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1534 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1535 | mmc_set_ios(host); |
778e277c | 1536 | |
041beb1d DD |
1537 | /* |
1538 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1539 | * XO-1.5, require a short delay after poweroff before the card | |
1540 | * can be successfully turned on again. | |
1541 | */ | |
1542 | mmc_delay(1); | |
1543 | ||
778e277c | 1544 | mmc_host_clk_release(host); |
1da177e4 LT |
1545 | } |
1546 | ||
276e090f JR |
1547 | void mmc_power_cycle(struct mmc_host *host) |
1548 | { | |
1549 | mmc_power_off(host); | |
1550 | /* Wait at least 1 ms according to SD spec */ | |
1551 | mmc_delay(1); | |
1552 | mmc_power_up(host); | |
1553 | } | |
1554 | ||
39361851 AB |
1555 | /* |
1556 | * Cleanup when the last reference to the bus operator is dropped. | |
1557 | */ | |
261172fd | 1558 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1559 | { |
1560 | BUG_ON(!host); | |
1561 | BUG_ON(host->bus_refs); | |
1562 | BUG_ON(!host->bus_dead); | |
1563 | ||
1564 | host->bus_ops = NULL; | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * Increase reference count of bus operator | |
1569 | */ | |
1570 | static inline void mmc_bus_get(struct mmc_host *host) | |
1571 | { | |
1572 | unsigned long flags; | |
1573 | ||
1574 | spin_lock_irqsave(&host->lock, flags); | |
1575 | host->bus_refs++; | |
1576 | spin_unlock_irqrestore(&host->lock, flags); | |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | * Decrease reference count of bus operator and free it if | |
1581 | * it is the last reference. | |
1582 | */ | |
1583 | static inline void mmc_bus_put(struct mmc_host *host) | |
1584 | { | |
1585 | unsigned long flags; | |
1586 | ||
1587 | spin_lock_irqsave(&host->lock, flags); | |
1588 | host->bus_refs--; | |
1589 | if ((host->bus_refs == 0) && host->bus_ops) | |
1590 | __mmc_release_bus(host); | |
1591 | spin_unlock_irqrestore(&host->lock, flags); | |
1592 | } | |
1593 | ||
1da177e4 | 1594 | /* |
7ea239d9 PO |
1595 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1596 | * host at any given time. | |
1da177e4 | 1597 | */ |
7ea239d9 | 1598 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1599 | { |
7ea239d9 | 1600 | unsigned long flags; |
e45a1bd2 | 1601 | |
7ea239d9 PO |
1602 | BUG_ON(!host); |
1603 | BUG_ON(!ops); | |
b855885e | 1604 | |
d84075c8 | 1605 | WARN_ON(!host->claimed); |
bce40a36 | 1606 | |
7ea239d9 | 1607 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1608 | |
7ea239d9 PO |
1609 | BUG_ON(host->bus_ops); |
1610 | BUG_ON(host->bus_refs); | |
b57c43ad | 1611 | |
7ea239d9 PO |
1612 | host->bus_ops = ops; |
1613 | host->bus_refs = 1; | |
1614 | host->bus_dead = 0; | |
b57c43ad | 1615 | |
7ea239d9 | 1616 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1617 | } |
1618 | ||
7ea239d9 | 1619 | /* |
7f7e4129 | 1620 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1621 | */ |
1622 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1623 | { |
7ea239d9 | 1624 | unsigned long flags; |
7ccd266e | 1625 | |
7ea239d9 | 1626 | BUG_ON(!host); |
7ccd266e | 1627 | |
d84075c8 PO |
1628 | WARN_ON(!host->claimed); |
1629 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1630 | |
7ea239d9 | 1631 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1632 | |
7ea239d9 | 1633 | host->bus_dead = 1; |
7ccd266e | 1634 | |
7ea239d9 | 1635 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1636 | |
7ea239d9 | 1637 | mmc_bus_put(host); |
1da177e4 LT |
1638 | } |
1639 | ||
1da177e4 LT |
1640 | /** |
1641 | * mmc_detect_change - process change of state on a MMC socket | |
1642 | * @host: host which changed state. | |
8dc00335 | 1643 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1644 | * |
67a61c48 PO |
1645 | * MMC drivers should call this when they detect a card has been |
1646 | * inserted or removed. The MMC layer will confirm that any | |
1647 | * present card is still functional, and initialize any newly | |
1648 | * inserted. | |
1da177e4 | 1649 | */ |
8dc00335 | 1650 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1651 | { |
3b91e550 | 1652 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1653 | unsigned long flags; |
01f41ec7 | 1654 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1655 | WARN_ON(host->removed); |
01f41ec7 | 1656 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 1657 | #endif |
d3049504 | 1658 | host->detect_change = 1; |
c4028958 | 1659 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1660 | } |
1661 | ||
1662 | EXPORT_SYMBOL(mmc_detect_change); | |
1663 | ||
dfe86cba AH |
1664 | void mmc_init_erase(struct mmc_card *card) |
1665 | { | |
1666 | unsigned int sz; | |
1667 | ||
1668 | if (is_power_of_2(card->erase_size)) | |
1669 | card->erase_shift = ffs(card->erase_size) - 1; | |
1670 | else | |
1671 | card->erase_shift = 0; | |
1672 | ||
1673 | /* | |
1674 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1675 | * card. That is not desirable because it can take a long time | |
1676 | * (minutes) potentially delaying more important I/O, and also the | |
1677 | * timeout calculations become increasingly hugely over-estimated. | |
1678 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1679 | * to that size and alignment. | |
1680 | * | |
1681 | * For SD cards that define Allocation Unit size, limit erases to one | |
1682 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1683 | * Erase Size, whether it is switched on or not, limit to that size. | |
1684 | * Otherwise just have a stab at a good value. For modern cards it | |
1685 | * will end up being 4MiB. Note that if the value is too small, it | |
1686 | * can end up taking longer to erase. | |
1687 | */ | |
1688 | if (mmc_card_sd(card) && card->ssr.au) { | |
1689 | card->pref_erase = card->ssr.au; | |
1690 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1691 | } else if (card->ext_csd.hc_erase_size) { | |
1692 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1693 | } else { | |
1694 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1695 | if (sz < 128) | |
1696 | card->pref_erase = 512 * 1024 / 512; | |
1697 | else if (sz < 512) | |
1698 | card->pref_erase = 1024 * 1024 / 512; | |
1699 | else if (sz < 1024) | |
1700 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1701 | else | |
1702 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1703 | if (card->pref_erase < card->erase_size) | |
1704 | card->pref_erase = card->erase_size; | |
1705 | else { | |
1706 | sz = card->pref_erase % card->erase_size; | |
1707 | if (sz) | |
1708 | card->pref_erase += card->erase_size - sz; | |
1709 | } | |
1710 | } | |
1711 | } | |
1712 | ||
eaa02f75 AW |
1713 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1714 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1715 | { |
1716 | unsigned int erase_timeout; | |
1717 | ||
7194efb8 AH |
1718 | if (arg == MMC_DISCARD_ARG || |
1719 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
1720 | erase_timeout = card->ext_csd.trim_timeout; | |
1721 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
1722 | /* High Capacity Erase Group Size uses HC timeouts */ |
1723 | if (arg == MMC_TRIM_ARG) | |
1724 | erase_timeout = card->ext_csd.trim_timeout; | |
1725 | else | |
1726 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1727 | } else { | |
1728 | /* CSD Erase Group Size uses write timeout */ | |
1729 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1730 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1731 | unsigned int timeout_us; | |
1732 | ||
1733 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1734 | if (card->csd.tacc_ns < 1000000) | |
1735 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1736 | else | |
1737 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1738 | ||
1739 | /* | |
1740 | * ios.clock is only a target. The real clock rate might be | |
1741 | * less but not that much less, so fudge it by multiplying by 2. | |
1742 | */ | |
1743 | timeout_clks <<= 1; | |
1744 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1745 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1746 | |
1747 | erase_timeout = timeout_us / 1000; | |
1748 | ||
1749 | /* | |
1750 | * Theoretically, the calculation could underflow so round up | |
1751 | * to 1ms in that case. | |
1752 | */ | |
1753 | if (!erase_timeout) | |
1754 | erase_timeout = 1; | |
1755 | } | |
1756 | ||
1757 | /* Multiplier for secure operations */ | |
1758 | if (arg & MMC_SECURE_ARGS) { | |
1759 | if (arg == MMC_SECURE_ERASE_ARG) | |
1760 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1761 | else | |
1762 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1763 | } | |
1764 | ||
1765 | erase_timeout *= qty; | |
1766 | ||
1767 | /* | |
1768 | * Ensure at least a 1 second timeout for SPI as per | |
1769 | * 'mmc_set_data_timeout()' | |
1770 | */ | |
1771 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1772 | erase_timeout = 1000; | |
1773 | ||
eaa02f75 | 1774 | return erase_timeout; |
dfe86cba AH |
1775 | } |
1776 | ||
eaa02f75 AW |
1777 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1778 | unsigned int arg, | |
1779 | unsigned int qty) | |
dfe86cba | 1780 | { |
eaa02f75 AW |
1781 | unsigned int erase_timeout; |
1782 | ||
dfe86cba AH |
1783 | if (card->ssr.erase_timeout) { |
1784 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1785 | erase_timeout = card->ssr.erase_timeout * qty + |
1786 | card->ssr.erase_offset; | |
dfe86cba AH |
1787 | } else { |
1788 | /* | |
1789 | * Erase timeout not specified in SD Status Register (SSR) so | |
1790 | * use 250ms per write block. | |
1791 | */ | |
eaa02f75 | 1792 | erase_timeout = 250 * qty; |
dfe86cba AH |
1793 | } |
1794 | ||
1795 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1796 | if (erase_timeout < 1000) |
1797 | erase_timeout = 1000; | |
1798 | ||
1799 | return erase_timeout; | |
dfe86cba AH |
1800 | } |
1801 | ||
eaa02f75 AW |
1802 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1803 | unsigned int arg, | |
1804 | unsigned int qty) | |
dfe86cba AH |
1805 | { |
1806 | if (mmc_card_sd(card)) | |
eaa02f75 | 1807 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1808 | else |
eaa02f75 | 1809 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1810 | } |
1811 | ||
1812 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1813 | unsigned int to, unsigned int arg) | |
1814 | { | |
1278dba1 | 1815 | struct mmc_command cmd = {0}; |
dfe86cba | 1816 | unsigned int qty = 0; |
8fee476b | 1817 | unsigned long timeout; |
dfe86cba AH |
1818 | int err; |
1819 | ||
1820 | /* | |
1821 | * qty is used to calculate the erase timeout which depends on how many | |
1822 | * erase groups (or allocation units in SD terminology) are affected. | |
1823 | * We count erasing part of an erase group as one erase group. | |
1824 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1825 | * erase group size is almost certainly also power of 2, but it does not | |
1826 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1827 | * division in that case. SD may not specify an allocation unit size, | |
1828 | * in which case the timeout is based on the number of write blocks. | |
1829 | * | |
1830 | * Note that the timeout for secure trim 2 will only be correct if the | |
1831 | * number of erase groups specified is the same as the total of all | |
1832 | * preceding secure trim 1 commands. Since the power may have been | |
1833 | * lost since the secure trim 1 commands occurred, it is generally | |
1834 | * impossible to calculate the secure trim 2 timeout correctly. | |
1835 | */ | |
1836 | if (card->erase_shift) | |
1837 | qty += ((to >> card->erase_shift) - | |
1838 | (from >> card->erase_shift)) + 1; | |
1839 | else if (mmc_card_sd(card)) | |
1840 | qty += to - from + 1; | |
1841 | else | |
1842 | qty += ((to / card->erase_size) - | |
1843 | (from / card->erase_size)) + 1; | |
1844 | ||
1845 | if (!mmc_card_blockaddr(card)) { | |
1846 | from <<= 9; | |
1847 | to <<= 9; | |
1848 | } | |
1849 | ||
dfe86cba AH |
1850 | if (mmc_card_sd(card)) |
1851 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1852 | else | |
1853 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1854 | cmd.arg = from; | |
1855 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1856 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1857 | if (err) { | |
a3c76eb9 | 1858 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 1859 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 1860 | err = -EIO; |
dfe86cba AH |
1861 | goto out; |
1862 | } | |
1863 | ||
1864 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1865 | if (mmc_card_sd(card)) | |
1866 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1867 | else | |
1868 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1869 | cmd.arg = to; | |
1870 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1871 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1872 | if (err) { | |
a3c76eb9 | 1873 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 1874 | err, cmd.resp[0]); |
67716327 | 1875 | err = -EIO; |
dfe86cba AH |
1876 | goto out; |
1877 | } | |
1878 | ||
1879 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1880 | cmd.opcode = MMC_ERASE; | |
1881 | cmd.arg = arg; | |
1882 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1883 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1884 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1885 | if (err) { | |
a3c76eb9 | 1886 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
1887 | err, cmd.resp[0]); |
1888 | err = -EIO; | |
1889 | goto out; | |
1890 | } | |
1891 | ||
1892 | if (mmc_host_is_spi(card->host)) | |
1893 | goto out; | |
1894 | ||
8fee476b | 1895 | timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS); |
dfe86cba AH |
1896 | do { |
1897 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1898 | cmd.opcode = MMC_SEND_STATUS; | |
1899 | cmd.arg = card->rca << 16; | |
1900 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1901 | /* Do not retry else we can't see errors */ | |
1902 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1903 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 1904 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
1905 | err, cmd.resp[0]); |
1906 | err = -EIO; | |
1907 | goto out; | |
1908 | } | |
8fee476b TR |
1909 | |
1910 | /* Timeout if the device never becomes ready for data and | |
1911 | * never leaves the program state. | |
1912 | */ | |
1913 | if (time_after(jiffies, timeout)) { | |
1914 | pr_err("%s: Card stuck in programming state! %s\n", | |
1915 | mmc_hostname(card->host), __func__); | |
1916 | err = -EIO; | |
1917 | goto out; | |
1918 | } | |
1919 | ||
dfe86cba | 1920 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || |
8fee476b | 1921 | (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)); |
dfe86cba AH |
1922 | out: |
1923 | return err; | |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * mmc_erase - erase sectors. | |
1928 | * @card: card to erase | |
1929 | * @from: first sector to erase | |
1930 | * @nr: number of sectors to erase | |
1931 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1932 | * | |
1933 | * Caller must claim host before calling this function. | |
1934 | */ | |
1935 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1936 | unsigned int arg) | |
1937 | { | |
1938 | unsigned int rem, to = from + nr; | |
1939 | ||
1940 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1941 | !(card->csd.cmdclass & CCC_ERASE)) | |
1942 | return -EOPNOTSUPP; | |
1943 | ||
1944 | if (!card->erase_size) | |
1945 | return -EOPNOTSUPP; | |
1946 | ||
1947 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1948 | return -EOPNOTSUPP; | |
1949 | ||
1950 | if ((arg & MMC_SECURE_ARGS) && | |
1951 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1952 | return -EOPNOTSUPP; | |
1953 | ||
1954 | if ((arg & MMC_TRIM_ARGS) && | |
1955 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1956 | return -EOPNOTSUPP; | |
1957 | ||
1958 | if (arg == MMC_SECURE_ERASE_ARG) { | |
1959 | if (from % card->erase_size || nr % card->erase_size) | |
1960 | return -EINVAL; | |
1961 | } | |
1962 | ||
1963 | if (arg == MMC_ERASE_ARG) { | |
1964 | rem = from % card->erase_size; | |
1965 | if (rem) { | |
1966 | rem = card->erase_size - rem; | |
1967 | from += rem; | |
1968 | if (nr > rem) | |
1969 | nr -= rem; | |
1970 | else | |
1971 | return 0; | |
1972 | } | |
1973 | rem = nr % card->erase_size; | |
1974 | if (rem) | |
1975 | nr -= rem; | |
1976 | } | |
1977 | ||
1978 | if (nr == 0) | |
1979 | return 0; | |
1980 | ||
1981 | to = from + nr; | |
1982 | ||
1983 | if (to <= from) | |
1984 | return -EINVAL; | |
1985 | ||
1986 | /* 'from' and 'to' are inclusive */ | |
1987 | to -= 1; | |
1988 | ||
1989 | return mmc_do_erase(card, from, to, arg); | |
1990 | } | |
1991 | EXPORT_SYMBOL(mmc_erase); | |
1992 | ||
1993 | int mmc_can_erase(struct mmc_card *card) | |
1994 | { | |
1995 | if ((card->host->caps & MMC_CAP_ERASE) && | |
1996 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
1997 | return 1; | |
1998 | return 0; | |
1999 | } | |
2000 | EXPORT_SYMBOL(mmc_can_erase); | |
2001 | ||
2002 | int mmc_can_trim(struct mmc_card *card) | |
2003 | { | |
2004 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
2005 | return 1; | |
2006 | return 0; | |
2007 | } | |
2008 | EXPORT_SYMBOL(mmc_can_trim); | |
2009 | ||
b3bf9153 KP |
2010 | int mmc_can_discard(struct mmc_card *card) |
2011 | { | |
2012 | /* | |
2013 | * As there's no way to detect the discard support bit at v4.5 | |
2014 | * use the s/w feature support filed. | |
2015 | */ | |
2016 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
2017 | return 1; | |
2018 | return 0; | |
2019 | } | |
2020 | EXPORT_SYMBOL(mmc_can_discard); | |
2021 | ||
d9ddd629 KP |
2022 | int mmc_can_sanitize(struct mmc_card *card) |
2023 | { | |
28302812 AH |
2024 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
2025 | return 0; | |
d9ddd629 KP |
2026 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
2027 | return 1; | |
2028 | return 0; | |
2029 | } | |
2030 | EXPORT_SYMBOL(mmc_can_sanitize); | |
2031 | ||
dfe86cba AH |
2032 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
2033 | { | |
2034 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
2035 | return 1; | |
2036 | return 0; | |
2037 | } | |
2038 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
2039 | ||
2040 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
2041 | unsigned int nr) | |
2042 | { | |
2043 | if (!card->erase_size) | |
2044 | return 0; | |
2045 | if (from % card->erase_size || nr % card->erase_size) | |
2046 | return 0; | |
2047 | return 1; | |
2048 | } | |
2049 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 2050 | |
e056a1b5 AH |
2051 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
2052 | unsigned int arg) | |
2053 | { | |
2054 | struct mmc_host *host = card->host; | |
2055 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
2056 | unsigned int last_timeout = 0; | |
2057 | ||
2058 | if (card->erase_shift) | |
2059 | max_qty = UINT_MAX >> card->erase_shift; | |
2060 | else if (mmc_card_sd(card)) | |
2061 | max_qty = UINT_MAX; | |
2062 | else | |
2063 | max_qty = UINT_MAX / card->erase_size; | |
2064 | ||
2065 | /* Find the largest qty with an OK timeout */ | |
2066 | do { | |
2067 | y = 0; | |
2068 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
2069 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
2070 | if (timeout > host->max_discard_to) | |
2071 | break; | |
2072 | if (timeout < last_timeout) | |
2073 | break; | |
2074 | last_timeout = timeout; | |
2075 | y = x; | |
2076 | } | |
2077 | qty += y; | |
2078 | } while (y); | |
2079 | ||
2080 | if (!qty) | |
2081 | return 0; | |
2082 | ||
2083 | if (qty == 1) | |
2084 | return 1; | |
2085 | ||
2086 | /* Convert qty to sectors */ | |
2087 | if (card->erase_shift) | |
2088 | max_discard = --qty << card->erase_shift; | |
2089 | else if (mmc_card_sd(card)) | |
2090 | max_discard = qty; | |
2091 | else | |
2092 | max_discard = --qty * card->erase_size; | |
2093 | ||
2094 | return max_discard; | |
2095 | } | |
2096 | ||
2097 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
2098 | { | |
2099 | struct mmc_host *host = card->host; | |
2100 | unsigned int max_discard, max_trim; | |
2101 | ||
2102 | if (!host->max_discard_to) | |
2103 | return UINT_MAX; | |
2104 | ||
2105 | /* | |
2106 | * Without erase_group_def set, MMC erase timeout depends on clock | |
2107 | * frequence which can change. In that case, the best choice is | |
2108 | * just the preferred erase size. | |
2109 | */ | |
2110 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
2111 | return card->pref_erase; | |
2112 | ||
2113 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
2114 | if (mmc_can_trim(card)) { | |
2115 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
2116 | if (max_trim < max_discard) | |
2117 | max_discard = max_trim; | |
2118 | } else if (max_discard < card->erase_size) { | |
2119 | max_discard = 0; | |
2120 | } | |
2121 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
2122 | mmc_hostname(host), max_discard, host->max_discard_to); | |
2123 | return max_discard; | |
2124 | } | |
2125 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
2126 | ||
0f8d8ea6 AH |
2127 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
2128 | { | |
1278dba1 | 2129 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
2130 | |
2131 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
2132 | return 0; | |
2133 | ||
0f8d8ea6 AH |
2134 | cmd.opcode = MMC_SET_BLOCKLEN; |
2135 | cmd.arg = blocklen; | |
2136 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2137 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2138 | } | |
2139 | EXPORT_SYMBOL(mmc_set_blocklen); | |
2140 | ||
67c79db8 LP |
2141 | int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount, |
2142 | bool is_rel_write) | |
2143 | { | |
2144 | struct mmc_command cmd = {0}; | |
2145 | ||
2146 | cmd.opcode = MMC_SET_BLOCK_COUNT; | |
2147 | cmd.arg = blockcount & 0x0000FFFF; | |
2148 | if (is_rel_write) | |
2149 | cmd.arg |= 1 << 31; | |
2150 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2151 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2152 | } | |
2153 | EXPORT_SYMBOL(mmc_set_blockcount); | |
2154 | ||
b2499518 AH |
2155 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
2156 | { | |
2157 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2158 | return; | |
2159 | mmc_host_clk_hold(host); | |
2160 | host->ops->hw_reset(host); | |
2161 | mmc_host_clk_release(host); | |
2162 | } | |
2163 | ||
2164 | int mmc_can_reset(struct mmc_card *card) | |
2165 | { | |
2166 | u8 rst_n_function; | |
2167 | ||
2168 | if (!mmc_card_mmc(card)) | |
2169 | return 0; | |
2170 | rst_n_function = card->ext_csd.rst_n_function; | |
2171 | if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED) | |
2172 | return 0; | |
2173 | return 1; | |
2174 | } | |
2175 | EXPORT_SYMBOL(mmc_can_reset); | |
2176 | ||
2177 | static int mmc_do_hw_reset(struct mmc_host *host, int check) | |
2178 | { | |
2179 | struct mmc_card *card = host->card; | |
2180 | ||
2181 | if (!host->bus_ops->power_restore) | |
2182 | return -EOPNOTSUPP; | |
2183 | ||
2184 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2185 | return -EOPNOTSUPP; | |
2186 | ||
2187 | if (!card) | |
2188 | return -EINVAL; | |
2189 | ||
2190 | if (!mmc_can_reset(card)) | |
2191 | return -EOPNOTSUPP; | |
2192 | ||
2193 | mmc_host_clk_hold(host); | |
2194 | mmc_set_clock(host, host->f_init); | |
2195 | ||
2196 | host->ops->hw_reset(host); | |
2197 | ||
2198 | /* If the reset has happened, then a status command will fail */ | |
2199 | if (check) { | |
2200 | struct mmc_command cmd = {0}; | |
2201 | int err; | |
2202 | ||
2203 | cmd.opcode = MMC_SEND_STATUS; | |
2204 | if (!mmc_host_is_spi(card->host)) | |
2205 | cmd.arg = card->rca << 16; | |
2206 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
2207 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2208 | if (!err) { | |
2209 | mmc_host_clk_release(host); | |
2210 | return -ENOSYS; | |
2211 | } | |
2212 | } | |
2213 | ||
2214 | host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR); | |
2215 | if (mmc_host_is_spi(host)) { | |
2216 | host->ios.chip_select = MMC_CS_HIGH; | |
2217 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
2218 | } else { | |
2219 | host->ios.chip_select = MMC_CS_DONTCARE; | |
2220 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
2221 | } | |
2222 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
2223 | host->ios.timing = MMC_TIMING_LEGACY; | |
2224 | mmc_set_ios(host); | |
2225 | ||
2226 | mmc_host_clk_release(host); | |
2227 | ||
2228 | return host->bus_ops->power_restore(host); | |
2229 | } | |
2230 | ||
2231 | int mmc_hw_reset(struct mmc_host *host) | |
2232 | { | |
2233 | return mmc_do_hw_reset(host, 0); | |
2234 | } | |
2235 | EXPORT_SYMBOL(mmc_hw_reset); | |
2236 | ||
2237 | int mmc_hw_reset_check(struct mmc_host *host) | |
2238 | { | |
2239 | return mmc_do_hw_reset(host, 1); | |
2240 | } | |
2241 | EXPORT_SYMBOL(mmc_hw_reset_check); | |
2242 | ||
807e8e40 AR |
2243 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2244 | { | |
2245 | host->f_init = freq; | |
2246 | ||
2247 | #ifdef CONFIG_MMC_DEBUG | |
2248 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2249 | mmc_hostname(host), __func__, host->f_init); | |
2250 | #endif | |
2251 | mmc_power_up(host); | |
2f94e55a | 2252 | |
b2499518 AH |
2253 | /* |
2254 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2255 | * do a hardware reset if possible. | |
2256 | */ | |
2257 | mmc_hw_reset_for_init(host); | |
2258 | ||
2f94e55a PR |
2259 | /* |
2260 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2261 | * if the card is being re-initialized, just send it. CMD52 | |
2262 | * should be ignored by SD/eMMC cards. | |
2263 | */ | |
807e8e40 AR |
2264 | sdio_reset(host); |
2265 | mmc_go_idle(host); | |
2266 | ||
2267 | mmc_send_if_cond(host, host->ocr_avail); | |
2268 | ||
2269 | /* Order's important: probe SDIO, then SD, then MMC */ | |
2270 | if (!mmc_attach_sdio(host)) | |
2271 | return 0; | |
2272 | if (!mmc_attach_sd(host)) | |
2273 | return 0; | |
2274 | if (!mmc_attach_mmc(host)) | |
2275 | return 0; | |
2276 | ||
2277 | mmc_power_off(host); | |
2278 | return -EIO; | |
2279 | } | |
2280 | ||
d3049504 AH |
2281 | int _mmc_detect_card_removed(struct mmc_host *host) |
2282 | { | |
2283 | int ret; | |
2284 | ||
2285 | if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive) | |
2286 | return 0; | |
2287 | ||
2288 | if (!host->card || mmc_card_removed(host->card)) | |
2289 | return 1; | |
2290 | ||
2291 | ret = host->bus_ops->alive(host); | |
1450734e KL |
2292 | |
2293 | /* | |
2294 | * Card detect status and alive check may be out of sync if card is | |
2295 | * removed slowly, when card detect switch changes while card/slot | |
2296 | * pads are still contacted in hardware (refer to "SD Card Mechanical | |
2297 | * Addendum, Appendix C: Card Detection Switch"). So reschedule a | |
2298 | * detect work 200ms later for this case. | |
2299 | */ | |
2300 | if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) { | |
2301 | mmc_detect_change(host, msecs_to_jiffies(200)); | |
2302 | pr_debug("%s: card removed too slowly\n", mmc_hostname(host)); | |
2303 | } | |
2304 | ||
d3049504 AH |
2305 | if (ret) { |
2306 | mmc_card_set_removed(host->card); | |
2307 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2308 | } | |
2309 | ||
2310 | return ret; | |
2311 | } | |
2312 | ||
2313 | int mmc_detect_card_removed(struct mmc_host *host) | |
2314 | { | |
2315 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2316 | int ret; |
d3049504 AH |
2317 | |
2318 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2319 | |
2320 | if (!card) | |
2321 | return 1; | |
2322 | ||
2323 | ret = mmc_card_removed(card); | |
d3049504 AH |
2324 | /* |
2325 | * The card will be considered unchanged unless we have been asked to | |
2326 | * detect a change or host requires polling to provide card detection. | |
2327 | */ | |
b6891679 | 2328 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) |
f0cc9cf9 | 2329 | return ret; |
d3049504 AH |
2330 | |
2331 | host->detect_change = 0; | |
f0cc9cf9 UH |
2332 | if (!ret) { |
2333 | ret = _mmc_detect_card_removed(host); | |
b6891679 | 2334 | if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) { |
f0cc9cf9 UH |
2335 | /* |
2336 | * Schedule a detect work as soon as possible to let a | |
2337 | * rescan handle the card removal. | |
2338 | */ | |
2339 | cancel_delayed_work(&host->detect); | |
2340 | mmc_detect_change(host, 0); | |
2341 | } | |
2342 | } | |
d3049504 | 2343 | |
f0cc9cf9 | 2344 | return ret; |
d3049504 AH |
2345 | } |
2346 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2347 | ||
b93931a6 | 2348 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2349 | { |
c4028958 DH |
2350 | struct mmc_host *host = |
2351 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2352 | int i; |
4c2ef25f | 2353 | |
807e8e40 | 2354 | if (host->rescan_disable) |
4c2ef25f | 2355 | return; |
1da177e4 | 2356 | |
3339d1e3 JR |
2357 | /* If there is a non-removable card registered, only scan once */ |
2358 | if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered) | |
2359 | return; | |
2360 | host->rescan_entered = 1; | |
2361 | ||
7ea239d9 | 2362 | mmc_bus_get(host); |
b855885e | 2363 | |
30201e7f OBC |
2364 | /* |
2365 | * if there is a _removable_ card registered, check whether it is | |
2366 | * still present | |
2367 | */ | |
2368 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 2369 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
2370 | host->bus_ops->detect(host); |
2371 | ||
d3049504 AH |
2372 | host->detect_change = 0; |
2373 | ||
c5841798 CB |
2374 | /* |
2375 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2376 | * the card is no longer present. | |
2377 | */ | |
94d89efb | 2378 | mmc_bus_put(host); |
94d89efb JS |
2379 | mmc_bus_get(host); |
2380 | ||
2381 | /* if there still is a card present, stop here */ | |
2382 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2383 | mmc_bus_put(host); |
94d89efb JS |
2384 | goto out; |
2385 | } | |
1da177e4 | 2386 | |
94d89efb JS |
2387 | /* |
2388 | * Only we can add a new handler, so it's safe to | |
2389 | * release the lock here. | |
2390 | */ | |
2391 | mmc_bus_put(host); | |
1da177e4 | 2392 | |
fa550189 UH |
2393 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) { |
2394 | mmc_claim_host(host); | |
2395 | mmc_power_off(host); | |
2396 | mmc_release_host(host); | |
94d89efb | 2397 | goto out; |
fa550189 | 2398 | } |
1da177e4 | 2399 | |
807e8e40 | 2400 | mmc_claim_host(host); |
88ae8b86 | 2401 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2402 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2403 | break; | |
06b2233a | 2404 | if (freqs[i] <= host->f_min) |
807e8e40 | 2405 | break; |
88ae8b86 | 2406 | } |
807e8e40 AR |
2407 | mmc_release_host(host); |
2408 | ||
2409 | out: | |
28f52482 AV |
2410 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2411 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2412 | } |
2413 | ||
b93931a6 | 2414 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2415 | { |
fa550189 | 2416 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2417 | host->rescan_disable = 0; |
a08b17be AH |
2418 | if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP) |
2419 | mmc_power_off(host); | |
2420 | else | |
0d3e3350 | 2421 | mmc_power_up(host); |
b93931a6 | 2422 | mmc_detect_change(host, 0); |
1da177e4 LT |
2423 | } |
2424 | ||
b93931a6 | 2425 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2426 | { |
3b91e550 | 2427 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2428 | unsigned long flags; |
2429 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2430 | host->removed = 1; |
1efd48b3 | 2431 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
2432 | #endif |
2433 | ||
d9adcc12 | 2434 | host->rescan_disable = 1; |
d9bcbf34 | 2435 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
2436 | mmc_flush_scheduled_work(); |
2437 | ||
da68c4eb NP |
2438 | /* clear pm flags now and let card drivers set them as needed */ |
2439 | host->pm_flags = 0; | |
2440 | ||
7ea239d9 PO |
2441 | mmc_bus_get(host); |
2442 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2443 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
7ea239d9 PO |
2444 | if (host->bus_ops->remove) |
2445 | host->bus_ops->remove(host); | |
2446 | ||
2447 | mmc_claim_host(host); | |
2448 | mmc_detach_bus(host); | |
7f7e4129 | 2449 | mmc_power_off(host); |
7ea239d9 | 2450 | mmc_release_host(host); |
53509f0f DK |
2451 | mmc_bus_put(host); |
2452 | return; | |
1da177e4 | 2453 | } |
7ea239d9 PO |
2454 | mmc_bus_put(host); |
2455 | ||
2456 | BUG_ON(host->card); | |
1da177e4 LT |
2457 | |
2458 | mmc_power_off(host); | |
2459 | } | |
2460 | ||
12ae637f | 2461 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2462 | { |
12ae637f OBC |
2463 | int ret = 0; |
2464 | ||
bb9cab94 DD |
2465 | #ifdef CONFIG_MMC_DEBUG |
2466 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2467 | #endif | |
2468 | ||
eae1aeee AH |
2469 | mmc_bus_get(host); |
2470 | ||
2471 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2472 | mmc_bus_put(host); | |
12ae637f | 2473 | return -EINVAL; |
eae1aeee AH |
2474 | } |
2475 | ||
2476 | if (host->bus_ops->power_save) | |
12ae637f | 2477 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2478 | |
2479 | mmc_bus_put(host); | |
2480 | ||
2481 | mmc_power_off(host); | |
12ae637f OBC |
2482 | |
2483 | return ret; | |
eae1aeee AH |
2484 | } |
2485 | EXPORT_SYMBOL(mmc_power_save_host); | |
2486 | ||
12ae637f | 2487 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2488 | { |
12ae637f OBC |
2489 | int ret; |
2490 | ||
bb9cab94 DD |
2491 | #ifdef CONFIG_MMC_DEBUG |
2492 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2493 | #endif | |
2494 | ||
eae1aeee AH |
2495 | mmc_bus_get(host); |
2496 | ||
2497 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2498 | mmc_bus_put(host); | |
12ae637f | 2499 | return -EINVAL; |
eae1aeee AH |
2500 | } |
2501 | ||
2502 | mmc_power_up(host); | |
12ae637f | 2503 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2504 | |
2505 | mmc_bus_put(host); | |
12ae637f OBC |
2506 | |
2507 | return ret; | |
eae1aeee AH |
2508 | } |
2509 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2510 | ||
b1ebe384 JL |
2511 | int mmc_card_awake(struct mmc_host *host) |
2512 | { | |
2513 | int err = -ENOSYS; | |
2514 | ||
aa9df4fb UH |
2515 | if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) |
2516 | return 0; | |
2517 | ||
b1ebe384 JL |
2518 | mmc_bus_get(host); |
2519 | ||
2520 | if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) | |
2521 | err = host->bus_ops->awake(host); | |
2522 | ||
2523 | mmc_bus_put(host); | |
2524 | ||
2525 | return err; | |
2526 | } | |
2527 | EXPORT_SYMBOL(mmc_card_awake); | |
2528 | ||
2529 | int mmc_card_sleep(struct mmc_host *host) | |
2530 | { | |
2531 | int err = -ENOSYS; | |
2532 | ||
aa9df4fb UH |
2533 | if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) |
2534 | return 0; | |
2535 | ||
b1ebe384 JL |
2536 | mmc_bus_get(host); |
2537 | ||
c99872a1 | 2538 | if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep) |
b1ebe384 JL |
2539 | err = host->bus_ops->sleep(host); |
2540 | ||
2541 | mmc_bus_put(host); | |
2542 | ||
2543 | return err; | |
2544 | } | |
2545 | EXPORT_SYMBOL(mmc_card_sleep); | |
2546 | ||
2547 | int mmc_card_can_sleep(struct mmc_host *host) | |
2548 | { | |
2549 | struct mmc_card *card = host->card; | |
2550 | ||
2551 | if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3) | |
2552 | return 1; | |
2553 | return 0; | |
2554 | } | |
2555 | EXPORT_SYMBOL(mmc_card_can_sleep); | |
2556 | ||
881d1c25 SJ |
2557 | /* |
2558 | * Flush the cache to the non-volatile storage. | |
2559 | */ | |
2560 | int mmc_flush_cache(struct mmc_card *card) | |
2561 | { | |
2562 | struct mmc_host *host = card->host; | |
2563 | int err = 0; | |
2564 | ||
2565 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL)) | |
2566 | return err; | |
2567 | ||
2568 | if (mmc_card_mmc(card) && | |
2569 | (card->ext_csd.cache_size > 0) && | |
2570 | (card->ext_csd.cache_ctrl & 1)) { | |
2571 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2572 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2573 | if (err) | |
2574 | pr_err("%s: cache flush error %d\n", | |
2575 | mmc_hostname(card->host), err); | |
2576 | } | |
2577 | ||
2578 | return err; | |
2579 | } | |
2580 | EXPORT_SYMBOL(mmc_flush_cache); | |
2581 | ||
2582 | /* | |
2583 | * Turn the cache ON/OFF. | |
2584 | * Turning the cache OFF shall trigger flushing of the data | |
2585 | * to the non-volatile storage. | |
881d926d | 2586 | * This function should be called with host claimed |
881d1c25 SJ |
2587 | */ |
2588 | int mmc_cache_ctrl(struct mmc_host *host, u8 enable) | |
2589 | { | |
2590 | struct mmc_card *card = host->card; | |
8bc0678b | 2591 | unsigned int timeout; |
881d1c25 SJ |
2592 | int err = 0; |
2593 | ||
2594 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) || | |
2595 | mmc_card_is_removable(host)) | |
2596 | return err; | |
2597 | ||
2598 | if (card && mmc_card_mmc(card) && | |
2599 | (card->ext_csd.cache_size > 0)) { | |
2600 | enable = !!enable; | |
2601 | ||
8bc0678b SJ |
2602 | if (card->ext_csd.cache_ctrl ^ enable) { |
2603 | timeout = enable ? card->ext_csd.generic_cmd6_time : 0; | |
881d1c25 | 2604 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
8bc0678b SJ |
2605 | EXT_CSD_CACHE_CTRL, enable, timeout); |
2606 | if (err) | |
2607 | pr_err("%s: cache %s error %d\n", | |
2608 | mmc_hostname(card->host), | |
2609 | enable ? "on" : "off", | |
2610 | err); | |
2611 | else | |
2612 | card->ext_csd.cache_ctrl = enable; | |
2613 | } | |
881d1c25 SJ |
2614 | } |
2615 | ||
2616 | return err; | |
2617 | } | |
2618 | EXPORT_SYMBOL(mmc_cache_ctrl); | |
2619 | ||
1da177e4 LT |
2620 | #ifdef CONFIG_PM |
2621 | ||
2622 | /** | |
2623 | * mmc_suspend_host - suspend a host | |
2624 | * @host: mmc host | |
1da177e4 | 2625 | */ |
1a13f8fa | 2626 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 2627 | { |
95cdfb72 NP |
2628 | int err = 0; |
2629 | ||
7de427d0 | 2630 | cancel_delayed_work(&host->detect); |
b5af25be | 2631 | mmc_flush_scheduled_work(); |
17e9ff55 | 2632 | |
7ea239d9 PO |
2633 | mmc_bus_get(host); |
2634 | if (host->bus_ops && !host->bus_dead) { | |
950d56ac JC |
2635 | if (host->bus_ops->suspend) { |
2636 | if (mmc_card_doing_bkops(host->card)) { | |
2637 | err = mmc_stop_bkops(host->card); | |
2638 | if (err) | |
2639 | goto out; | |
2640 | } | |
7c570919 | 2641 | err = host->bus_ops->suspend(host); |
950d56ac | 2642 | } |
49df7807 | 2643 | |
7c570919 UH |
2644 | if (err == -ENOSYS || !host->bus_ops->resume) { |
2645 | /* | |
2646 | * We simply "remove" the card in this case. | |
2647 | * It will be redetected on resume. (Calling | |
2648 | * bus_ops->remove() with a claimed host can | |
2649 | * deadlock.) | |
2650 | */ | |
2651 | if (host->bus_ops->remove) | |
2652 | host->bus_ops->remove(host); | |
2653 | mmc_claim_host(host); | |
2654 | mmc_detach_bus(host); | |
2655 | mmc_power_off(host); | |
2656 | mmc_release_host(host); | |
2657 | host->pm_flags = 0; | |
2658 | err = 0; | |
1c8cf9c9 | 2659 | } |
b5af25be | 2660 | } |
7ea239d9 PO |
2661 | mmc_bus_put(host); |
2662 | ||
a5e9425d | 2663 | if (!err && !mmc_card_keep_power(host)) |
95cdfb72 | 2664 | mmc_power_off(host); |
1da177e4 | 2665 | |
881d1c25 | 2666 | out: |
95cdfb72 | 2667 | return err; |
1da177e4 LT |
2668 | } |
2669 | ||
2670 | EXPORT_SYMBOL(mmc_suspend_host); | |
2671 | ||
2672 | /** | |
2673 | * mmc_resume_host - resume a previously suspended host | |
2674 | * @host: mmc host | |
2675 | */ | |
2676 | int mmc_resume_host(struct mmc_host *host) | |
2677 | { | |
95cdfb72 NP |
2678 | int err = 0; |
2679 | ||
6abaa0c9 PO |
2680 | mmc_bus_get(host); |
2681 | if (host->bus_ops && !host->bus_dead) { | |
a5e9425d | 2682 | if (!mmc_card_keep_power(host)) { |
da68c4eb NP |
2683 | mmc_power_up(host); |
2684 | mmc_select_voltage(host, host->ocr); | |
e594573d OBC |
2685 | /* |
2686 | * Tell runtime PM core we just powered up the card, | |
2687 | * since it still believes the card is powered off. | |
2688 | * Note that currently runtime PM is only enabled | |
2689 | * for SDIO cards that are MMC_CAP_POWER_OFF_CARD | |
2690 | */ | |
2691 | if (mmc_card_sdio(host->card) && | |
2692 | (host->caps & MMC_CAP_POWER_OFF_CARD)) { | |
2693 | pm_runtime_disable(&host->card->dev); | |
2694 | pm_runtime_set_active(&host->card->dev); | |
2695 | pm_runtime_enable(&host->card->dev); | |
2696 | } | |
da68c4eb | 2697 | } |
6abaa0c9 | 2698 | BUG_ON(!host->bus_ops->resume); |
95cdfb72 NP |
2699 | err = host->bus_ops->resume(host); |
2700 | if (err) { | |
a3c76eb9 | 2701 | pr_warning("%s: error %d during resume " |
95cdfb72 NP |
2702 | "(card was removed?)\n", |
2703 | mmc_hostname(host), err); | |
95cdfb72 NP |
2704 | err = 0; |
2705 | } | |
6abaa0c9 | 2706 | } |
a8e6df73 | 2707 | host->pm_flags &= ~MMC_PM_KEEP_POWER; |
6abaa0c9 PO |
2708 | mmc_bus_put(host); |
2709 | ||
95cdfb72 | 2710 | return err; |
1da177e4 | 2711 | } |
1da177e4 LT |
2712 | EXPORT_SYMBOL(mmc_resume_host); |
2713 | ||
4c2ef25f ML |
2714 | /* Do the card removal on suspend if card is assumed removeable |
2715 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2716 | to sync the card. | |
2717 | */ | |
2718 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2719 | unsigned long mode, void *unused) | |
2720 | { | |
2721 | struct mmc_host *host = container_of( | |
2722 | notify_block, struct mmc_host, pm_notify); | |
2723 | unsigned long flags; | |
950d56ac | 2724 | int err = 0; |
4c2ef25f ML |
2725 | |
2726 | switch (mode) { | |
2727 | case PM_HIBERNATION_PREPARE: | |
2728 | case PM_SUSPEND_PREPARE: | |
950d56ac JC |
2729 | if (host->card && mmc_card_mmc(host->card) && |
2730 | mmc_card_doing_bkops(host->card)) { | |
2731 | err = mmc_stop_bkops(host->card); | |
2732 | if (err) { | |
2733 | pr_err("%s: didn't stop bkops\n", | |
2734 | mmc_hostname(host)); | |
2735 | return err; | |
2736 | } | |
2737 | mmc_card_clr_doing_bkops(host->card); | |
2738 | } | |
4c2ef25f ML |
2739 | |
2740 | spin_lock_irqsave(&host->lock, flags); | |
2741 | host->rescan_disable = 1; | |
2742 | spin_unlock_irqrestore(&host->lock, flags); | |
2743 | cancel_delayed_work_sync(&host->detect); | |
2744 | ||
2745 | if (!host->bus_ops || host->bus_ops->suspend) | |
2746 | break; | |
2747 | ||
0db13fc2 | 2748 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
4c2ef25f ML |
2749 | if (host->bus_ops->remove) |
2750 | host->bus_ops->remove(host); | |
2751 | ||
0db13fc2 | 2752 | mmc_claim_host(host); |
4c2ef25f | 2753 | mmc_detach_bus(host); |
7f7e4129 | 2754 | mmc_power_off(host); |
4c2ef25f ML |
2755 | mmc_release_host(host); |
2756 | host->pm_flags = 0; | |
2757 | break; | |
2758 | ||
2759 | case PM_POST_SUSPEND: | |
2760 | case PM_POST_HIBERNATION: | |
274476f8 | 2761 | case PM_POST_RESTORE: |
4c2ef25f ML |
2762 | |
2763 | spin_lock_irqsave(&host->lock, flags); | |
2764 | host->rescan_disable = 0; | |
2765 | spin_unlock_irqrestore(&host->lock, flags); | |
2766 | mmc_detect_change(host, 0); | |
2767 | ||
2768 | } | |
2769 | ||
2770 | return 0; | |
2771 | } | |
1da177e4 LT |
2772 | #endif |
2773 | ||
2220eedf KD |
2774 | /** |
2775 | * mmc_init_context_info() - init synchronization context | |
2776 | * @host: mmc host | |
2777 | * | |
2778 | * Init struct context_info needed to implement asynchronous | |
2779 | * request mechanism, used by mmc core, host driver and mmc requests | |
2780 | * supplier. | |
2781 | */ | |
2782 | void mmc_init_context_info(struct mmc_host *host) | |
2783 | { | |
2784 | spin_lock_init(&host->context_info.lock); | |
2785 | host->context_info.is_new_req = false; | |
2786 | host->context_info.is_done_rcv = false; | |
2787 | host->context_info.is_waiting_last_req = false; | |
2788 | init_waitqueue_head(&host->context_info.wait); | |
2789 | } | |
2790 | ||
ffce2e7e PO |
2791 | static int __init mmc_init(void) |
2792 | { | |
2793 | int ret; | |
2794 | ||
0d9ee5b2 | 2795 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2796 | if (!workqueue) |
2797 | return -ENOMEM; | |
2798 | ||
2799 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2800 | if (ret) |
2801 | goto destroy_workqueue; | |
2802 | ||
2803 | ret = mmc_register_host_class(); | |
2804 | if (ret) | |
2805 | goto unregister_bus; | |
2806 | ||
2807 | ret = sdio_register_bus(); | |
2808 | if (ret) | |
2809 | goto unregister_host_class; | |
2810 | ||
2811 | return 0; | |
2812 | ||
2813 | unregister_host_class: | |
2814 | mmc_unregister_host_class(); | |
2815 | unregister_bus: | |
2816 | mmc_unregister_bus(); | |
2817 | destroy_workqueue: | |
2818 | destroy_workqueue(workqueue); | |
2819 | ||
ffce2e7e PO |
2820 | return ret; |
2821 | } | |
2822 | ||
2823 | static void __exit mmc_exit(void) | |
2824 | { | |
e29a7d73 | 2825 | sdio_unregister_bus(); |
ffce2e7e PO |
2826 | mmc_unregister_host_class(); |
2827 | mmc_unregister_bus(); | |
2828 | destroy_workqueue(workqueue); | |
2829 | } | |
2830 | ||
26074962 | 2831 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2832 | module_exit(mmc_exit); |
2833 | ||
1da177e4 | 2834 | MODULE_LICENSE("GPL"); |