Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
ad3868b2 | 6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
af8350c7 | 21 | #include <linux/leds.h> |
b57c43ad | 22 | #include <linux/scatterlist.h> |
86e8286a | 23 | #include <linux/log2.h> |
5c13941a | 24 | #include <linux/regulator/consumer.h> |
e594573d | 25 | #include <linux/pm_runtime.h> |
bbd43682 | 26 | #include <linux/pm_wakeup.h> |
35eb6db1 | 27 | #include <linux/suspend.h> |
1b676f70 PF |
28 | #include <linux/fault-inject.h> |
29 | #include <linux/random.h> | |
950d56ac | 30 | #include <linux/slab.h> |
6e9e318b | 31 | #include <linux/of.h> |
1da177e4 LT |
32 | |
33 | #include <linux/mmc/card.h> | |
34 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
35 | #include <linux/mmc/mmc.h> |
36 | #include <linux/mmc/sd.h> | |
1da177e4 | 37 | |
aaac1b47 | 38 | #include "core.h" |
ffce2e7e PO |
39 | #include "bus.h" |
40 | #include "host.h" | |
e29a7d73 | 41 | #include "sdio_bus.h" |
da7fbe58 PO |
42 | |
43 | #include "mmc_ops.h" | |
44 | #include "sd_ops.h" | |
5c4e6f13 | 45 | #include "sdio_ops.h" |
1da177e4 | 46 | |
8fee476b TR |
47 | /* If the device is not responding */ |
48 | #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */ | |
49 | ||
950d56ac JC |
50 | /* |
51 | * Background operations can take a long time, depending on the housekeeping | |
52 | * operations the card has to perform. | |
53 | */ | |
54 | #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */ | |
55 | ||
ffce2e7e | 56 | static struct workqueue_struct *workqueue; |
fa550189 | 57 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 58 | |
af517150 DB |
59 | /* |
60 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
61 | * performance cost, and for other reasons may not always be desired. | |
62 | * So we allow it it to be disabled. | |
63 | */ | |
90ab5ee9 | 64 | bool use_spi_crc = 1; |
af517150 DB |
65 | module_param(use_spi_crc, bool, 0); |
66 | ||
ffce2e7e PO |
67 | /* |
68 | * Internal function. Schedule delayed work in the MMC work queue. | |
69 | */ | |
70 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
71 | unsigned long delay) | |
72 | { | |
73 | return queue_delayed_work(workqueue, work, delay); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Internal function. Flush all scheduled work from the MMC work queue. | |
78 | */ | |
79 | static void mmc_flush_scheduled_work(void) | |
80 | { | |
81 | flush_workqueue(workqueue); | |
82 | } | |
83 | ||
1b676f70 PF |
84 | #ifdef CONFIG_FAIL_MMC_REQUEST |
85 | ||
86 | /* | |
87 | * Internal function. Inject random data errors. | |
88 | * If mmc_data is NULL no errors are injected. | |
89 | */ | |
90 | static void mmc_should_fail_request(struct mmc_host *host, | |
91 | struct mmc_request *mrq) | |
92 | { | |
93 | struct mmc_command *cmd = mrq->cmd; | |
94 | struct mmc_data *data = mrq->data; | |
95 | static const int data_errors[] = { | |
96 | -ETIMEDOUT, | |
97 | -EILSEQ, | |
98 | -EIO, | |
99 | }; | |
100 | ||
101 | if (!data) | |
102 | return; | |
103 | ||
104 | if (cmd->error || data->error || | |
105 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
106 | return; | |
107 | ||
2e744fcb AM |
108 | data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)]; |
109 | data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9; | |
1b676f70 PF |
110 | } |
111 | ||
112 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
113 | ||
114 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
115 | struct mmc_request *mrq) | |
116 | { | |
117 | } | |
118 | ||
119 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
120 | ||
1da177e4 | 121 | /** |
fe10c6ab RK |
122 | * mmc_request_done - finish processing an MMC request |
123 | * @host: MMC host which completed request | |
124 | * @mrq: MMC request which request | |
1da177e4 LT |
125 | * |
126 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 127 | * their processing of a request. |
1da177e4 LT |
128 | */ |
129 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
130 | { | |
131 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
132 | int err = cmd->error; |
133 | ||
af517150 DB |
134 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
135 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
136 | cmd->retries = 0; | |
137 | } | |
138 | ||
d3049504 | 139 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
140 | /* |
141 | * Request starter must handle retries - see | |
142 | * mmc_wait_for_req_done(). | |
143 | */ | |
144 | if (mrq->done) | |
145 | mrq->done(mrq); | |
e4d21708 | 146 | } else { |
1b676f70 PF |
147 | mmc_should_fail_request(host, mrq); |
148 | ||
af8350c7 PO |
149 | led_trigger_event(host->led, LED_OFF); |
150 | ||
e4d21708 PO |
151 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
152 | mmc_hostname(host), cmd->opcode, err, | |
153 | cmd->resp[0], cmd->resp[1], | |
154 | cmd->resp[2], cmd->resp[3]); | |
155 | ||
156 | if (mrq->data) { | |
157 | pr_debug("%s: %d bytes transferred: %d\n", | |
158 | mmc_hostname(host), | |
159 | mrq->data->bytes_xfered, mrq->data->error); | |
160 | } | |
161 | ||
162 | if (mrq->stop) { | |
163 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
164 | mmc_hostname(host), mrq->stop->opcode, | |
165 | mrq->stop->error, | |
166 | mrq->stop->resp[0], mrq->stop->resp[1], | |
167 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
168 | } | |
169 | ||
170 | if (mrq->done) | |
171 | mrq->done(mrq); | |
04566831 | 172 | |
08c14071 | 173 | mmc_host_clk_release(host); |
1da177e4 LT |
174 | } |
175 | } | |
176 | ||
177 | EXPORT_SYMBOL(mmc_request_done); | |
178 | ||
39361851 | 179 | static void |
1da177e4 LT |
180 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
181 | { | |
976d9276 PO |
182 | #ifdef CONFIG_MMC_DEBUG |
183 | unsigned int i, sz; | |
a84756c5 | 184 | struct scatterlist *sg; |
976d9276 PO |
185 | #endif |
186 | ||
7b2fd4f2 JC |
187 | if (mrq->sbc) { |
188 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
189 | mmc_hostname(host), mrq->sbc->opcode, | |
190 | mrq->sbc->arg, mrq->sbc->flags); | |
191 | } | |
192 | ||
920e70c5 RK |
193 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
194 | mmc_hostname(host), mrq->cmd->opcode, | |
195 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 196 | |
e4d21708 PO |
197 | if (mrq->data) { |
198 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
199 | "tsac %d ms nsac %d\n", | |
200 | mmc_hostname(host), mrq->data->blksz, | |
201 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 202 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
203 | mrq->data->timeout_clks); |
204 | } | |
205 | ||
206 | if (mrq->stop) { | |
207 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
208 | mmc_hostname(host), mrq->stop->opcode, | |
209 | mrq->stop->arg, mrq->stop->flags); | |
210 | } | |
211 | ||
f22ee4ed | 212 | WARN_ON(!host->claimed); |
1da177e4 LT |
213 | |
214 | mrq->cmd->error = 0; | |
215 | mrq->cmd->mrq = mrq; | |
216 | if (mrq->data) { | |
fe4a3c7a | 217 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
218 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
219 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
220 | host->max_req_size); | |
fe4a3c7a | 221 | |
976d9276 PO |
222 | #ifdef CONFIG_MMC_DEBUG |
223 | sz = 0; | |
a84756c5 PO |
224 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
225 | sz += sg->length; | |
976d9276 PO |
226 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
227 | #endif | |
228 | ||
1da177e4 LT |
229 | mrq->cmd->data = mrq->data; |
230 | mrq->data->error = 0; | |
231 | mrq->data->mrq = mrq; | |
232 | if (mrq->stop) { | |
233 | mrq->data->stop = mrq->stop; | |
234 | mrq->stop->error = 0; | |
235 | mrq->stop->mrq = mrq; | |
236 | } | |
237 | } | |
08c14071 | 238 | mmc_host_clk_hold(host); |
66c036e0 | 239 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
240 | host->ops->request(host, mrq); |
241 | } | |
242 | ||
950d56ac JC |
243 | /** |
244 | * mmc_start_bkops - start BKOPS for supported cards | |
245 | * @card: MMC card to start BKOPS | |
246 | * @form_exception: A flag to indicate if this function was | |
247 | * called due to an exception raised by the card | |
248 | * | |
249 | * Start background operations whenever requested. | |
250 | * When the urgent BKOPS bit is set in a R1 command response | |
251 | * then background operations should be started immediately. | |
252 | */ | |
253 | void mmc_start_bkops(struct mmc_card *card, bool from_exception) | |
254 | { | |
255 | int err; | |
256 | int timeout; | |
257 | bool use_busy_signal; | |
258 | ||
259 | BUG_ON(!card); | |
260 | ||
261 | if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card)) | |
262 | return; | |
263 | ||
264 | err = mmc_read_bkops_status(card); | |
265 | if (err) { | |
266 | pr_err("%s: Failed to read bkops status: %d\n", | |
267 | mmc_hostname(card->host), err); | |
268 | return; | |
269 | } | |
270 | ||
271 | if (!card->ext_csd.raw_bkops_status) | |
272 | return; | |
273 | ||
274 | if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 && | |
275 | from_exception) | |
276 | return; | |
277 | ||
278 | mmc_claim_host(card->host); | |
279 | if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) { | |
280 | timeout = MMC_BKOPS_MAX_TIMEOUT; | |
281 | use_busy_signal = true; | |
282 | } else { | |
283 | timeout = 0; | |
284 | use_busy_signal = false; | |
285 | } | |
286 | ||
287 | err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
878e200b | 288 | EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal, true); |
950d56ac JC |
289 | if (err) { |
290 | pr_warn("%s: Error %d starting bkops\n", | |
291 | mmc_hostname(card->host), err); | |
292 | goto out; | |
293 | } | |
294 | ||
295 | /* | |
296 | * For urgent bkops status (LEVEL_2 and more) | |
297 | * bkops executed synchronously, otherwise | |
298 | * the operation is in progress | |
299 | */ | |
300 | if (!use_busy_signal) | |
301 | mmc_card_set_doing_bkops(card); | |
302 | out: | |
303 | mmc_release_host(card->host); | |
304 | } | |
305 | EXPORT_SYMBOL(mmc_start_bkops); | |
306 | ||
2220eedf KD |
307 | /* |
308 | * mmc_wait_data_done() - done callback for data request | |
309 | * @mrq: done data request | |
310 | * | |
311 | * Wakes up mmc context, passed as a callback to host controller driver | |
312 | */ | |
313 | static void mmc_wait_data_done(struct mmc_request *mrq) | |
314 | { | |
315 | mrq->host->context_info.is_done_rcv = true; | |
316 | wake_up_interruptible(&mrq->host->context_info.wait); | |
317 | } | |
318 | ||
1da177e4 LT |
319 | static void mmc_wait_done(struct mmc_request *mrq) |
320 | { | |
aa8b683a PF |
321 | complete(&mrq->completion); |
322 | } | |
323 | ||
2220eedf KD |
324 | /* |
325 | *__mmc_start_data_req() - starts data request | |
326 | * @host: MMC host to start the request | |
327 | * @mrq: data request to start | |
328 | * | |
329 | * Sets the done callback to be called when request is completed by the card. | |
330 | * Starts data mmc request execution | |
331 | */ | |
332 | static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq) | |
333 | { | |
334 | mrq->done = mmc_wait_data_done; | |
335 | mrq->host = host; | |
336 | if (mmc_card_removed(host->card)) { | |
337 | mrq->cmd->error = -ENOMEDIUM; | |
9b844961 | 338 | mmc_wait_data_done(mrq); |
2220eedf KD |
339 | return -ENOMEDIUM; |
340 | } | |
341 | mmc_start_request(host, mrq); | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
956d9fd5 | 346 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a PF |
347 | { |
348 | init_completion(&mrq->completion); | |
349 | mrq->done = mmc_wait_done; | |
d3049504 AH |
350 | if (mmc_card_removed(host->card)) { |
351 | mrq->cmd->error = -ENOMEDIUM; | |
352 | complete(&mrq->completion); | |
956d9fd5 | 353 | return -ENOMEDIUM; |
d3049504 | 354 | } |
aa8b683a | 355 | mmc_start_request(host, mrq); |
956d9fd5 | 356 | return 0; |
aa8b683a PF |
357 | } |
358 | ||
2220eedf KD |
359 | /* |
360 | * mmc_wait_for_data_req_done() - wait for request completed | |
361 | * @host: MMC host to prepare the command. | |
362 | * @mrq: MMC request to wait for | |
363 | * | |
364 | * Blocks MMC context till host controller will ack end of data request | |
365 | * execution or new request notification arrives from the block layer. | |
366 | * Handles command retries. | |
367 | * | |
368 | * Returns enum mmc_blk_status after checking errors. | |
369 | */ | |
370 | static int mmc_wait_for_data_req_done(struct mmc_host *host, | |
371 | struct mmc_request *mrq, | |
372 | struct mmc_async_req *next_req) | |
373 | { | |
374 | struct mmc_command *cmd; | |
375 | struct mmc_context_info *context_info = &host->context_info; | |
376 | int err; | |
377 | unsigned long flags; | |
378 | ||
379 | while (1) { | |
380 | wait_event_interruptible(context_info->wait, | |
381 | (context_info->is_done_rcv || | |
382 | context_info->is_new_req)); | |
383 | spin_lock_irqsave(&context_info->lock, flags); | |
384 | context_info->is_waiting_last_req = false; | |
385 | spin_unlock_irqrestore(&context_info->lock, flags); | |
386 | if (context_info->is_done_rcv) { | |
387 | context_info->is_done_rcv = false; | |
388 | context_info->is_new_req = false; | |
389 | cmd = mrq->cmd; | |
775a9362 | 390 | |
2220eedf KD |
391 | if (!cmd->error || !cmd->retries || |
392 | mmc_card_removed(host->card)) { | |
393 | err = host->areq->err_check(host->card, | |
394 | host->areq); | |
395 | break; /* return err */ | |
396 | } else { | |
397 | pr_info("%s: req failed (CMD%u): %d, retrying...\n", | |
398 | mmc_hostname(host), | |
399 | cmd->opcode, cmd->error); | |
400 | cmd->retries--; | |
401 | cmd->error = 0; | |
402 | host->ops->request(host, mrq); | |
403 | continue; /* wait for done/new event again */ | |
404 | } | |
405 | } else if (context_info->is_new_req) { | |
406 | context_info->is_new_req = false; | |
407 | if (!next_req) { | |
408 | err = MMC_BLK_NEW_REQUEST; | |
409 | break; /* return err */ | |
410 | } | |
411 | } | |
412 | } | |
413 | return err; | |
414 | } | |
415 | ||
aa8b683a PF |
416 | static void mmc_wait_for_req_done(struct mmc_host *host, |
417 | struct mmc_request *mrq) | |
418 | { | |
08a7e1df AH |
419 | struct mmc_command *cmd; |
420 | ||
421 | while (1) { | |
422 | wait_for_completion(&mrq->completion); | |
423 | ||
424 | cmd = mrq->cmd; | |
775a9362 ME |
425 | |
426 | /* | |
427 | * If host has timed out waiting for the sanitize | |
428 | * to complete, card might be still in programming state | |
429 | * so let's try to bring the card out of programming | |
430 | * state. | |
431 | */ | |
432 | if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) { | |
433 | if (!mmc_interrupt_hpi(host->card)) { | |
434 | pr_warning("%s: %s: Interrupted sanitize\n", | |
435 | mmc_hostname(host), __func__); | |
436 | cmd->error = 0; | |
437 | break; | |
438 | } else { | |
439 | pr_err("%s: %s: Failed to interrupt sanitize\n", | |
440 | mmc_hostname(host), __func__); | |
441 | } | |
442 | } | |
d3049504 AH |
443 | if (!cmd->error || !cmd->retries || |
444 | mmc_card_removed(host->card)) | |
08a7e1df AH |
445 | break; |
446 | ||
447 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
448 | mmc_hostname(host), cmd->opcode, cmd->error); | |
449 | cmd->retries--; | |
450 | cmd->error = 0; | |
451 | host->ops->request(host, mrq); | |
452 | } | |
aa8b683a PF |
453 | } |
454 | ||
455 | /** | |
456 | * mmc_pre_req - Prepare for a new request | |
457 | * @host: MMC host to prepare command | |
458 | * @mrq: MMC request to prepare for | |
459 | * @is_first_req: true if there is no previous started request | |
460 | * that may run in parellel to this call, otherwise false | |
461 | * | |
462 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
463 | * host prepare for the new request. Preparation of a request may be | |
464 | * performed while another request is running on the host. | |
465 | */ | |
466 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
467 | bool is_first_req) | |
468 | { | |
2c4967f7 SRT |
469 | if (host->ops->pre_req) { |
470 | mmc_host_clk_hold(host); | |
aa8b683a | 471 | host->ops->pre_req(host, mrq, is_first_req); |
2c4967f7 SRT |
472 | mmc_host_clk_release(host); |
473 | } | |
aa8b683a PF |
474 | } |
475 | ||
476 | /** | |
477 | * mmc_post_req - Post process a completed request | |
478 | * @host: MMC host to post process command | |
479 | * @mrq: MMC request to post process for | |
480 | * @err: Error, if non zero, clean up any resources made in pre_req | |
481 | * | |
482 | * Let the host post process a completed request. Post processing of | |
483 | * a request may be performed while another reuqest is running. | |
484 | */ | |
485 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
486 | int err) | |
487 | { | |
2c4967f7 SRT |
488 | if (host->ops->post_req) { |
489 | mmc_host_clk_hold(host); | |
aa8b683a | 490 | host->ops->post_req(host, mrq, err); |
2c4967f7 SRT |
491 | mmc_host_clk_release(host); |
492 | } | |
1da177e4 LT |
493 | } |
494 | ||
aa8b683a PF |
495 | /** |
496 | * mmc_start_req - start a non-blocking request | |
497 | * @host: MMC host to start command | |
498 | * @areq: async request to start | |
499 | * @error: out parameter returns 0 for success, otherwise non zero | |
500 | * | |
501 | * Start a new MMC custom command request for a host. | |
502 | * If there is on ongoing async request wait for completion | |
503 | * of that request and start the new one and return. | |
504 | * Does not wait for the new request to complete. | |
505 | * | |
506 | * Returns the completed request, NULL in case of none completed. | |
507 | * Wait for the an ongoing request (previoulsy started) to complete and | |
508 | * return the completed request. If there is no ongoing request, NULL | |
509 | * is returned without waiting. NULL is not an error condition. | |
510 | */ | |
511 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
512 | struct mmc_async_req *areq, int *error) | |
513 | { | |
514 | int err = 0; | |
956d9fd5 | 515 | int start_err = 0; |
aa8b683a PF |
516 | struct mmc_async_req *data = host->areq; |
517 | ||
518 | /* Prepare a new request */ | |
519 | if (areq) | |
520 | mmc_pre_req(host, areq->mrq, !host->areq); | |
521 | ||
522 | if (host->areq) { | |
f5c2758f JC |
523 | err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq); |
524 | if (err == MMC_BLK_NEW_REQUEST) { | |
525 | if (error) | |
526 | *error = err; | |
527 | /* | |
528 | * The previous request was not completed, | |
529 | * nothing to return | |
530 | */ | |
531 | return NULL; | |
532 | } | |
950d56ac JC |
533 | /* |
534 | * Check BKOPS urgency for each R1 response | |
535 | */ | |
536 | if (host->card && mmc_card_mmc(host->card) && | |
537 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
538 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
539 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) | |
540 | mmc_start_bkops(host->card, true); | |
aa8b683a PF |
541 | } |
542 | ||
956d9fd5 | 543 | if (!err && areq) |
2220eedf | 544 | start_err = __mmc_start_data_req(host, areq->mrq); |
aa8b683a PF |
545 | |
546 | if (host->areq) | |
547 | mmc_post_req(host, host->areq->mrq, 0); | |
548 | ||
956d9fd5 UH |
549 | /* Cancel a prepared request if it was not started. */ |
550 | if ((err || start_err) && areq) | |
f5c2758f | 551 | mmc_post_req(host, areq->mrq, -EINVAL); |
956d9fd5 UH |
552 | |
553 | if (err) | |
554 | host->areq = NULL; | |
555 | else | |
556 | host->areq = areq; | |
557 | ||
aa8b683a PF |
558 | if (error) |
559 | *error = err; | |
560 | return data; | |
561 | } | |
562 | EXPORT_SYMBOL(mmc_start_req); | |
563 | ||
67a61c48 PO |
564 | /** |
565 | * mmc_wait_for_req - start a request and wait for completion | |
566 | * @host: MMC host to start command | |
567 | * @mrq: MMC request to start | |
568 | * | |
569 | * Start a new MMC custom command request for a host, and wait | |
570 | * for the command to complete. Does not attempt to parse the | |
571 | * response. | |
572 | */ | |
573 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 574 | { |
aa8b683a PF |
575 | __mmc_start_req(host, mrq); |
576 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 577 | } |
1da177e4 LT |
578 | EXPORT_SYMBOL(mmc_wait_for_req); |
579 | ||
eb0d8f13 JC |
580 | /** |
581 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
582 | * @card: the MMC card associated with the HPI transfer | |
583 | * | |
584 | * Issued High Priority Interrupt, and check for card status | |
950d56ac | 585 | * until out-of prg-state. |
eb0d8f13 JC |
586 | */ |
587 | int mmc_interrupt_hpi(struct mmc_card *card) | |
588 | { | |
589 | int err; | |
590 | u32 status; | |
6af9e96e | 591 | unsigned long prg_wait; |
eb0d8f13 JC |
592 | |
593 | BUG_ON(!card); | |
594 | ||
595 | if (!card->ext_csd.hpi_en) { | |
596 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
597 | return 1; | |
598 | } | |
599 | ||
600 | mmc_claim_host(card->host); | |
601 | err = mmc_send_status(card, &status); | |
602 | if (err) { | |
603 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
604 | goto out; | |
605 | } | |
606 | ||
6af9e96e V |
607 | switch (R1_CURRENT_STATE(status)) { |
608 | case R1_STATE_IDLE: | |
609 | case R1_STATE_READY: | |
610 | case R1_STATE_STBY: | |
211d4fe5 | 611 | case R1_STATE_TRAN: |
6af9e96e | 612 | /* |
211d4fe5 | 613 | * In idle and transfer states, HPI is not needed and the caller |
6af9e96e V |
614 | * can issue the next intended command immediately |
615 | */ | |
616 | goto out; | |
617 | case R1_STATE_PRG: | |
618 | break; | |
619 | default: | |
620 | /* In all other states, it's illegal to issue HPI */ | |
621 | pr_debug("%s: HPI cannot be sent. Card state=%d\n", | |
622 | mmc_hostname(card->host), R1_CURRENT_STATE(status)); | |
623 | err = -EINVAL; | |
624 | goto out; | |
625 | } | |
626 | ||
627 | err = mmc_send_hpi_cmd(card, &status); | |
628 | if (err) | |
629 | goto out; | |
630 | ||
631 | prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time); | |
632 | do { | |
633 | err = mmc_send_status(card, &status); | |
634 | ||
635 | if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN) | |
636 | break; | |
637 | if (time_after(jiffies, prg_wait)) | |
638 | err = -ETIMEDOUT; | |
639 | } while (!err); | |
eb0d8f13 JC |
640 | |
641 | out: | |
642 | mmc_release_host(card->host); | |
643 | return err; | |
644 | } | |
645 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
646 | ||
1da177e4 LT |
647 | /** |
648 | * mmc_wait_for_cmd - start a command and wait for completion | |
649 | * @host: MMC host to start command | |
650 | * @cmd: MMC command to start | |
651 | * @retries: maximum number of retries | |
652 | * | |
653 | * Start a new MMC command for a host, and wait for the command | |
654 | * to complete. Return any error that occurred while the command | |
655 | * was executing. Do not attempt to parse the response. | |
656 | */ | |
657 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
658 | { | |
ad5fd972 | 659 | struct mmc_request mrq = {NULL}; |
1da177e4 | 660 | |
d84075c8 | 661 | WARN_ON(!host->claimed); |
1da177e4 | 662 | |
1da177e4 LT |
663 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
664 | cmd->retries = retries; | |
665 | ||
666 | mrq.cmd = cmd; | |
667 | cmd->data = NULL; | |
668 | ||
669 | mmc_wait_for_req(host, &mrq); | |
670 | ||
671 | return cmd->error; | |
672 | } | |
673 | ||
674 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
675 | ||
950d56ac JC |
676 | /** |
677 | * mmc_stop_bkops - stop ongoing BKOPS | |
678 | * @card: MMC card to check BKOPS | |
679 | * | |
680 | * Send HPI command to stop ongoing background operations to | |
681 | * allow rapid servicing of foreground operations, e.g. read/ | |
682 | * writes. Wait until the card comes out of the programming state | |
683 | * to avoid errors in servicing read/write requests. | |
684 | */ | |
685 | int mmc_stop_bkops(struct mmc_card *card) | |
686 | { | |
687 | int err = 0; | |
688 | ||
689 | BUG_ON(!card); | |
690 | err = mmc_interrupt_hpi(card); | |
691 | ||
692 | /* | |
693 | * If err is EINVAL, we can't issue an HPI. | |
694 | * It should complete the BKOPS. | |
695 | */ | |
696 | if (!err || (err == -EINVAL)) { | |
697 | mmc_card_clr_doing_bkops(card); | |
698 | err = 0; | |
699 | } | |
700 | ||
701 | return err; | |
702 | } | |
703 | EXPORT_SYMBOL(mmc_stop_bkops); | |
704 | ||
705 | int mmc_read_bkops_status(struct mmc_card *card) | |
706 | { | |
707 | int err; | |
708 | u8 *ext_csd; | |
709 | ||
710 | /* | |
711 | * In future work, we should consider storing the entire ext_csd. | |
712 | */ | |
713 | ext_csd = kmalloc(512, GFP_KERNEL); | |
714 | if (!ext_csd) { | |
715 | pr_err("%s: could not allocate buffer to receive the ext_csd.\n", | |
716 | mmc_hostname(card->host)); | |
717 | return -ENOMEM; | |
718 | } | |
719 | ||
720 | mmc_claim_host(card->host); | |
721 | err = mmc_send_ext_csd(card, ext_csd); | |
722 | mmc_release_host(card->host); | |
723 | if (err) | |
724 | goto out; | |
725 | ||
726 | card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; | |
727 | card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS]; | |
728 | out: | |
729 | kfree(ext_csd); | |
730 | return err; | |
731 | } | |
732 | EXPORT_SYMBOL(mmc_read_bkops_status); | |
733 | ||
d773d725 RK |
734 | /** |
735 | * mmc_set_data_timeout - set the timeout for a data command | |
736 | * @data: data phase for command | |
737 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
738 | * |
739 | * Computes the data timeout parameters according to the | |
740 | * correct algorithm given the card type. | |
d773d725 | 741 | */ |
b146d26a | 742 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
743 | { |
744 | unsigned int mult; | |
745 | ||
e6f918bf PO |
746 | /* |
747 | * SDIO cards only define an upper 1 s limit on access. | |
748 | */ | |
749 | if (mmc_card_sdio(card)) { | |
750 | data->timeout_ns = 1000000000; | |
751 | data->timeout_clks = 0; | |
752 | return; | |
753 | } | |
754 | ||
d773d725 RK |
755 | /* |
756 | * SD cards use a 100 multiplier rather than 10 | |
757 | */ | |
758 | mult = mmc_card_sd(card) ? 100 : 10; | |
759 | ||
760 | /* | |
761 | * Scale up the multiplier (and therefore the timeout) by | |
762 | * the r2w factor for writes. | |
763 | */ | |
b146d26a | 764 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
765 | mult <<= card->csd.r2w_factor; |
766 | ||
767 | data->timeout_ns = card->csd.tacc_ns * mult; | |
768 | data->timeout_clks = card->csd.tacc_clks * mult; | |
769 | ||
770 | /* | |
771 | * SD cards also have an upper limit on the timeout. | |
772 | */ | |
773 | if (mmc_card_sd(card)) { | |
774 | unsigned int timeout_us, limit_us; | |
775 | ||
776 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
777 | if (mmc_host_clk_rate(card->host)) |
778 | timeout_us += data->timeout_clks * 1000 / | |
779 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 780 | |
b146d26a | 781 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 782 | /* |
3bdc9ba8 PW |
783 | * The MMC spec "It is strongly recommended |
784 | * for hosts to implement more than 500ms | |
785 | * timeout value even if the card indicates | |
786 | * the 250ms maximum busy length." Even the | |
787 | * previous value of 300ms is known to be | |
788 | * insufficient for some cards. | |
493890e7 | 789 | */ |
3bdc9ba8 | 790 | limit_us = 3000000; |
d773d725 RK |
791 | else |
792 | limit_us = 100000; | |
793 | ||
fba68bd2 PL |
794 | /* |
795 | * SDHC cards always use these fixed values. | |
796 | */ | |
797 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
798 | data->timeout_ns = limit_us * 1000; |
799 | data->timeout_clks = 0; | |
800 | } | |
801 | } | |
6de5fc9c SNX |
802 | |
803 | /* | |
804 | * Some cards require longer data read timeout than indicated in CSD. | |
805 | * Address this by setting the read timeout to a "reasonably high" | |
806 | * value. For the cards tested, 300ms has proven enough. If necessary, | |
807 | * this value can be increased if other problematic cards require this. | |
808 | */ | |
809 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
810 | data->timeout_ns = 300000000; | |
811 | data->timeout_clks = 0; | |
812 | } | |
813 | ||
c0c88871 WM |
814 | /* |
815 | * Some cards need very high timeouts if driven in SPI mode. | |
816 | * The worst observed timeout was 900ms after writing a | |
817 | * continuous stream of data until the internal logic | |
818 | * overflowed. | |
819 | */ | |
820 | if (mmc_host_is_spi(card->host)) { | |
821 | if (data->flags & MMC_DATA_WRITE) { | |
822 | if (data->timeout_ns < 1000000000) | |
823 | data->timeout_ns = 1000000000; /* 1s */ | |
824 | } else { | |
825 | if (data->timeout_ns < 100000000) | |
826 | data->timeout_ns = 100000000; /* 100ms */ | |
827 | } | |
828 | } | |
d773d725 RK |
829 | } |
830 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
831 | ||
ad3868b2 PO |
832 | /** |
833 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
834 | * @card: the MMC card associated with the data transfer | |
835 | * @sz: original transfer size | |
836 | * | |
837 | * Pads the original data size with a number of extra bytes in | |
838 | * order to avoid controller bugs and/or performance hits | |
839 | * (e.g. some controllers revert to PIO for certain sizes). | |
840 | * | |
841 | * Returns the improved size, which might be unmodified. | |
842 | * | |
843 | * Note that this function is only relevant when issuing a | |
844 | * single scatter gather entry. | |
845 | */ | |
846 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
847 | { | |
848 | /* | |
849 | * FIXME: We don't have a system for the controller to tell | |
850 | * the core about its problems yet, so for now we just 32-bit | |
851 | * align the size. | |
852 | */ | |
853 | sz = ((sz + 3) / 4) * 4; | |
854 | ||
855 | return sz; | |
856 | } | |
857 | EXPORT_SYMBOL(mmc_align_data_size); | |
858 | ||
1da177e4 | 859 | /** |
2342f332 | 860 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 861 | * @host: mmc host to claim |
2342f332 | 862 | * @abort: whether or not the operation should be aborted |
1da177e4 | 863 | * |
2342f332 NP |
864 | * Claim a host for a set of operations. If @abort is non null and |
865 | * dereference a non-zero value then this will return prematurely with | |
866 | * that non-zero value without acquiring the lock. Returns zero | |
867 | * with the lock held otherwise. | |
1da177e4 | 868 | */ |
2342f332 | 869 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
870 | { |
871 | DECLARE_WAITQUEUE(wait, current); | |
872 | unsigned long flags; | |
2342f332 | 873 | int stop; |
1da177e4 | 874 | |
cf795bfb PO |
875 | might_sleep(); |
876 | ||
1da177e4 LT |
877 | add_wait_queue(&host->wq, &wait); |
878 | spin_lock_irqsave(&host->lock, flags); | |
879 | while (1) { | |
880 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 881 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 882 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
883 | break; |
884 | spin_unlock_irqrestore(&host->lock, flags); | |
885 | schedule(); | |
886 | spin_lock_irqsave(&host->lock, flags); | |
887 | } | |
888 | set_current_state(TASK_RUNNING); | |
319a3f14 | 889 | if (!stop) { |
2342f332 | 890 | host->claimed = 1; |
319a3f14 AH |
891 | host->claimer = current; |
892 | host->claim_cnt += 1; | |
893 | } else | |
2342f332 | 894 | wake_up(&host->wq); |
1da177e4 LT |
895 | spin_unlock_irqrestore(&host->lock, flags); |
896 | remove_wait_queue(&host->wq, &wait); | |
907d2e7c AH |
897 | if (host->ops->enable && !stop && host->claim_cnt == 1) |
898 | host->ops->enable(host); | |
2342f332 | 899 | return stop; |
1da177e4 LT |
900 | } |
901 | ||
2342f332 | 902 | EXPORT_SYMBOL(__mmc_claim_host); |
8ea926b2 | 903 | |
ab1efd27 | 904 | /** |
907d2e7c | 905 | * mmc_release_host - release a host |
ab1efd27 UH |
906 | * @host: mmc host to release |
907 | * | |
907d2e7c AH |
908 | * Release a MMC host, allowing others to claim the host |
909 | * for their operations. | |
ab1efd27 | 910 | */ |
907d2e7c | 911 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
912 | { |
913 | unsigned long flags; | |
914 | ||
907d2e7c AH |
915 | WARN_ON(!host->claimed); |
916 | ||
917 | if (host->ops->disable && host->claim_cnt == 1) | |
918 | host->ops->disable(host); | |
919 | ||
8ea926b2 | 920 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
921 | if (--host->claim_cnt) { |
922 | /* Release for nested claim */ | |
923 | spin_unlock_irqrestore(&host->lock, flags); | |
924 | } else { | |
925 | host->claimed = 0; | |
926 | host->claimer = NULL; | |
927 | spin_unlock_irqrestore(&host->lock, flags); | |
928 | wake_up(&host->wq); | |
929 | } | |
8ea926b2 | 930 | } |
1da177e4 LT |
931 | EXPORT_SYMBOL(mmc_release_host); |
932 | ||
e94cfef6 UH |
933 | /* |
934 | * This is a helper function, which fetches a runtime pm reference for the | |
935 | * card device and also claims the host. | |
936 | */ | |
937 | void mmc_get_card(struct mmc_card *card) | |
938 | { | |
939 | pm_runtime_get_sync(&card->dev); | |
940 | mmc_claim_host(card->host); | |
941 | } | |
942 | EXPORT_SYMBOL(mmc_get_card); | |
943 | ||
944 | /* | |
945 | * This is a helper function, which releases the host and drops the runtime | |
946 | * pm reference for the card device. | |
947 | */ | |
948 | void mmc_put_card(struct mmc_card *card) | |
949 | { | |
950 | mmc_release_host(card->host); | |
951 | pm_runtime_mark_last_busy(&card->dev); | |
952 | pm_runtime_put_autosuspend(&card->dev); | |
953 | } | |
954 | EXPORT_SYMBOL(mmc_put_card); | |
955 | ||
7ea239d9 PO |
956 | /* |
957 | * Internal function that does the actual ios call to the host driver, | |
958 | * optionally printing some debug output. | |
959 | */ | |
920e70c5 RK |
960 | static inline void mmc_set_ios(struct mmc_host *host) |
961 | { | |
962 | struct mmc_ios *ios = &host->ios; | |
963 | ||
cd9277c0 PO |
964 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
965 | "width %u timing %u\n", | |
920e70c5 RK |
966 | mmc_hostname(host), ios->clock, ios->bus_mode, |
967 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 968 | ios->bus_width, ios->timing); |
fba68bd2 | 969 | |
04566831 LW |
970 | if (ios->clock > 0) |
971 | mmc_set_ungated(host); | |
920e70c5 RK |
972 | host->ops->set_ios(host, ios); |
973 | } | |
974 | ||
7ea239d9 PO |
975 | /* |
976 | * Control chip select pin on a host. | |
977 | */ | |
da7fbe58 | 978 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 979 | { |
778e277c | 980 | mmc_host_clk_hold(host); |
da7fbe58 PO |
981 | host->ios.chip_select = mode; |
982 | mmc_set_ios(host); | |
778e277c | 983 | mmc_host_clk_release(host); |
1da177e4 LT |
984 | } |
985 | ||
7ea239d9 PO |
986 | /* |
987 | * Sets the host clock to the highest possible frequency that | |
988 | * is below "hz". | |
989 | */ | |
778e277c | 990 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
991 | { |
992 | WARN_ON(hz < host->f_min); | |
993 | ||
994 | if (hz > host->f_max) | |
995 | hz = host->f_max; | |
996 | ||
997 | host->ios.clock = hz; | |
998 | mmc_set_ios(host); | |
999 | } | |
1000 | ||
778e277c MW |
1001 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
1002 | { | |
1003 | mmc_host_clk_hold(host); | |
1004 | __mmc_set_clock(host, hz); | |
1005 | mmc_host_clk_release(host); | |
1006 | } | |
1007 | ||
04566831 LW |
1008 | #ifdef CONFIG_MMC_CLKGATE |
1009 | /* | |
1010 | * This gates the clock by setting it to 0 Hz. | |
1011 | */ | |
1012 | void mmc_gate_clock(struct mmc_host *host) | |
1013 | { | |
1014 | unsigned long flags; | |
1015 | ||
1016 | spin_lock_irqsave(&host->clk_lock, flags); | |
1017 | host->clk_old = host->ios.clock; | |
1018 | host->ios.clock = 0; | |
1019 | host->clk_gated = true; | |
1020 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
1021 | mmc_set_ios(host); | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * This restores the clock from gating by using the cached | |
1026 | * clock value. | |
1027 | */ | |
1028 | void mmc_ungate_clock(struct mmc_host *host) | |
1029 | { | |
1030 | /* | |
1031 | * We should previously have gated the clock, so the clock shall | |
1032 | * be 0 here! The clock may however be 0 during initialization, | |
1033 | * when some request operations are performed before setting | |
1034 | * the frequency. When ungate is requested in that situation | |
1035 | * we just ignore the call. | |
1036 | */ | |
1037 | if (host->clk_old) { | |
1038 | BUG_ON(host->ios.clock); | |
1039 | /* This call will also set host->clk_gated to false */ | |
778e277c | 1040 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
1041 | } |
1042 | } | |
1043 | ||
1044 | void mmc_set_ungated(struct mmc_host *host) | |
1045 | { | |
1046 | unsigned long flags; | |
1047 | ||
1048 | /* | |
1049 | * We've been given a new frequency while the clock is gated, | |
1050 | * so make sure we regard this as ungating it. | |
1051 | */ | |
1052 | spin_lock_irqsave(&host->clk_lock, flags); | |
1053 | host->clk_gated = false; | |
1054 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
1055 | } | |
1056 | ||
1057 | #else | |
1058 | void mmc_set_ungated(struct mmc_host *host) | |
1059 | { | |
1060 | } | |
1061 | #endif | |
1062 | ||
7ea239d9 PO |
1063 | /* |
1064 | * Change the bus mode (open drain/push-pull) of a host. | |
1065 | */ | |
1066 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
1067 | { | |
778e277c | 1068 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1069 | host->ios.bus_mode = mode; |
1070 | mmc_set_ios(host); | |
778e277c | 1071 | mmc_host_clk_release(host); |
7ea239d9 PO |
1072 | } |
1073 | ||
0f8d8ea6 AH |
1074 | /* |
1075 | * Change data bus width of a host. | |
1076 | */ | |
1077 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
1078 | { | |
778e277c | 1079 | mmc_host_clk_hold(host); |
4c4cb171 PR |
1080 | host->ios.bus_width = width; |
1081 | mmc_set_ios(host); | |
778e277c | 1082 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
1083 | } |
1084 | ||
86e8286a AV |
1085 | /** |
1086 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
1087 | * @vdd: voltage (mV) | |
1088 | * @low_bits: prefer low bits in boundary cases | |
1089 | * | |
1090 | * This function returns the OCR bit number according to the provided @vdd | |
1091 | * value. If conversion is not possible a negative errno value returned. | |
1092 | * | |
1093 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
1094 | * on boundary voltages. For example, | |
1095 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
1096 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
1097 | * | |
1098 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
1099 | */ | |
1100 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
1101 | { | |
1102 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1103 | int bit; | |
1104 | ||
1105 | if (vdd < 1650 || vdd > 3600) | |
1106 | return -EINVAL; | |
1107 | ||
1108 | if (vdd >= 1650 && vdd <= 1950) | |
1109 | return ilog2(MMC_VDD_165_195); | |
1110 | ||
1111 | if (low_bits) | |
1112 | vdd -= 1; | |
1113 | ||
1114 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1115 | bit = (vdd - 2000) / 100 + 8; | |
1116 | if (bit > max_bit) | |
1117 | return max_bit; | |
1118 | return bit; | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1123 | * @vdd_min: minimum voltage value (mV) | |
1124 | * @vdd_max: maximum voltage value (mV) | |
1125 | * | |
1126 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1127 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1128 | * | |
1129 | * Notes wrt boundary cases: | |
1130 | * This function sets the OCR bits for all boundary voltages, for example | |
1131 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1132 | * MMC_VDD_34_35 mask. | |
1133 | */ | |
1134 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1135 | { | |
1136 | u32 mask = 0; | |
1137 | ||
1138 | if (vdd_max < vdd_min) | |
1139 | return 0; | |
1140 | ||
1141 | /* Prefer high bits for the boundary vdd_max values. */ | |
1142 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1143 | if (vdd_max < 0) | |
1144 | return 0; | |
1145 | ||
1146 | /* Prefer low bits for the boundary vdd_min values. */ | |
1147 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1148 | if (vdd_min < 0) | |
1149 | return 0; | |
1150 | ||
1151 | /* Fill the mask, from max bit to min bit. */ | |
1152 | while (vdd_max >= vdd_min) | |
1153 | mask |= 1 << vdd_max--; | |
1154 | ||
1155 | return mask; | |
1156 | } | |
1157 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1158 | ||
6e9e318b HZ |
1159 | #ifdef CONFIG_OF |
1160 | ||
1161 | /** | |
1162 | * mmc_of_parse_voltage - return mask of supported voltages | |
1163 | * @np: The device node need to be parsed. | |
1164 | * @mask: mask of voltages available for MMC/SD/SDIO | |
1165 | * | |
1166 | * 1. Return zero on success. | |
1167 | * 2. Return negative errno: voltage-range is invalid. | |
1168 | */ | |
1169 | int mmc_of_parse_voltage(struct device_node *np, u32 *mask) | |
1170 | { | |
1171 | const u32 *voltage_ranges; | |
1172 | int num_ranges, i; | |
1173 | ||
1174 | voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); | |
1175 | num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; | |
1176 | if (!voltage_ranges || !num_ranges) { | |
1177 | pr_info("%s: voltage-ranges unspecified\n", np->full_name); | |
1178 | return -EINVAL; | |
1179 | } | |
1180 | ||
1181 | for (i = 0; i < num_ranges; i++) { | |
1182 | const int j = i * 2; | |
1183 | u32 ocr_mask; | |
1184 | ||
1185 | ocr_mask = mmc_vddrange_to_ocrmask( | |
1186 | be32_to_cpu(voltage_ranges[j]), | |
1187 | be32_to_cpu(voltage_ranges[j + 1])); | |
1188 | if (!ocr_mask) { | |
1189 | pr_err("%s: voltage-range #%d is invalid\n", | |
1190 | np->full_name, i); | |
1191 | return -EINVAL; | |
1192 | } | |
1193 | *mask |= ocr_mask; | |
1194 | } | |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | EXPORT_SYMBOL(mmc_of_parse_voltage); | |
1199 | ||
1200 | #endif /* CONFIG_OF */ | |
1201 | ||
5c13941a DB |
1202 | #ifdef CONFIG_REGULATOR |
1203 | ||
1204 | /** | |
1205 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1206 | * @supply: regulator to use | |
1207 | * | |
1208 | * This returns either a negative errno, or a mask of voltages that | |
1209 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1210 | * regulator. This would normally be called before registering the | |
1211 | * MMC host adapter. | |
1212 | */ | |
1213 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1214 | { | |
1215 | int result = 0; | |
1216 | int count; | |
1217 | int i; | |
1218 | ||
1219 | count = regulator_count_voltages(supply); | |
1220 | if (count < 0) | |
1221 | return count; | |
1222 | ||
1223 | for (i = 0; i < count; i++) { | |
1224 | int vdd_uV; | |
1225 | int vdd_mV; | |
1226 | ||
1227 | vdd_uV = regulator_list_voltage(supply, i); | |
1228 | if (vdd_uV <= 0) | |
1229 | continue; | |
1230 | ||
1231 | vdd_mV = vdd_uV / 1000; | |
1232 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1233 | } | |
1234 | ||
1235 | return result; | |
1236 | } | |
45a6b32e | 1237 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1238 | |
1239 | /** | |
1240 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1241 | * @mmc: the host to regulate |
5c13941a | 1242 | * @supply: regulator to use |
99fc5131 | 1243 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1244 | * |
1245 | * Returns zero on success, else negative errno. | |
1246 | * | |
1247 | * MMC host drivers may use this to enable or disable a regulator using | |
1248 | * a particular supply voltage. This would normally be called from the | |
1249 | * set_ios() method. | |
1250 | */ | |
99fc5131 LW |
1251 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1252 | struct regulator *supply, | |
1253 | unsigned short vdd_bit) | |
5c13941a DB |
1254 | { |
1255 | int result = 0; | |
1256 | int min_uV, max_uV; | |
5c13941a DB |
1257 | |
1258 | if (vdd_bit) { | |
1259 | int tmp; | |
1260 | int voltage; | |
1261 | ||
9cde5b7a CB |
1262 | /* |
1263 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
5c13941a DB |
1264 | * bits this regulator doesn't quite support ... don't |
1265 | * be too picky, most cards and regulators are OK with | |
1266 | * a 0.1V range goof (it's a small error percentage). | |
1267 | */ | |
1268 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1269 | if (tmp == 0) { | |
1270 | min_uV = 1650 * 1000; | |
1271 | max_uV = 1950 * 1000; | |
1272 | } else { | |
1273 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1274 | max_uV = min_uV + 100 * 1000; | |
1275 | } | |
1276 | ||
9cde5b7a CB |
1277 | /* |
1278 | * If we're using a fixed/static regulator, don't call | |
1279 | * regulator_set_voltage; it would fail. | |
5c13941a DB |
1280 | */ |
1281 | voltage = regulator_get_voltage(supply); | |
6e8201f5 | 1282 | |
5f56a8e6 | 1283 | if (!regulator_can_change_voltage(supply)) |
6e8201f5 JC |
1284 | min_uV = max_uV = voltage; |
1285 | ||
5c13941a DB |
1286 | if (voltage < 0) |
1287 | result = voltage; | |
1288 | else if (voltage < min_uV || voltage > max_uV) | |
1289 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
1290 | else | |
1291 | result = 0; | |
1292 | ||
99fc5131 | 1293 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1294 | result = regulator_enable(supply); |
99fc5131 LW |
1295 | if (!result) |
1296 | mmc->regulator_enabled = true; | |
1297 | } | |
1298 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1299 | result = regulator_disable(supply); |
99fc5131 LW |
1300 | if (result == 0) |
1301 | mmc->regulator_enabled = false; | |
5c13941a DB |
1302 | } |
1303 | ||
99fc5131 LW |
1304 | if (result) |
1305 | dev_err(mmc_dev(mmc), | |
1306 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1307 | return result; |
1308 | } | |
45a6b32e | 1309 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1310 | |
e137788d GL |
1311 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1312 | { | |
1313 | struct device *dev = mmc_dev(mmc); | |
1314 | struct regulator *supply; | |
1315 | int ret; | |
1316 | ||
1317 | supply = devm_regulator_get(dev, "vmmc"); | |
1318 | mmc->supply.vmmc = supply; | |
bc35d5ed | 1319 | mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc"); |
e137788d GL |
1320 | |
1321 | if (IS_ERR(supply)) | |
1322 | return PTR_ERR(supply); | |
1323 | ||
1324 | ret = mmc_regulator_get_ocrmask(supply); | |
1325 | if (ret > 0) | |
1326 | mmc->ocr_avail = ret; | |
1327 | else | |
1328 | dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret); | |
1329 | ||
1330 | return 0; | |
1331 | } | |
1332 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1333 | ||
99fc5131 | 1334 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1335 | |
1da177e4 LT |
1336 | /* |
1337 | * Mask off any voltages we don't support and select | |
1338 | * the lowest voltage | |
1339 | */ | |
7ea239d9 | 1340 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1341 | { |
1342 | int bit; | |
1343 | ||
726d6f23 UH |
1344 | /* |
1345 | * Sanity check the voltages that the card claims to | |
1346 | * support. | |
1347 | */ | |
1348 | if (ocr & 0x7F) { | |
1349 | dev_warn(mmc_dev(host), | |
1350 | "card claims to support voltages below defined range\n"); | |
1351 | ocr &= ~0x7F; | |
1352 | } | |
1353 | ||
1da177e4 | 1354 | ocr &= host->ocr_avail; |
ce69d37b UH |
1355 | if (!ocr) { |
1356 | dev_warn(mmc_dev(host), "no support for card's volts\n"); | |
1357 | return 0; | |
1358 | } | |
1da177e4 | 1359 | |
ce69d37b UH |
1360 | if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) { |
1361 | bit = ffs(ocr) - 1; | |
63ef731a | 1362 | ocr &= 3 << bit; |
ce69d37b | 1363 | mmc_power_cycle(host, ocr); |
1da177e4 | 1364 | } else { |
ce69d37b UH |
1365 | bit = fls(ocr) - 1; |
1366 | ocr &= 3 << bit; | |
1367 | if (bit != host->ios.vdd) | |
1368 | dev_warn(mmc_dev(host), "exceeding card's volts\n"); | |
1da177e4 LT |
1369 | } |
1370 | ||
1371 | return ocr; | |
1372 | } | |
1373 | ||
567c8903 JR |
1374 | int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) |
1375 | { | |
1376 | int err = 0; | |
1377 | int old_signal_voltage = host->ios.signal_voltage; | |
1378 | ||
1379 | host->ios.signal_voltage = signal_voltage; | |
1380 | if (host->ops->start_signal_voltage_switch) { | |
1381 | mmc_host_clk_hold(host); | |
1382 | err = host->ops->start_signal_voltage_switch(host, &host->ios); | |
1383 | mmc_host_clk_release(host); | |
1384 | } | |
1385 | ||
1386 | if (err) | |
1387 | host->ios.signal_voltage = old_signal_voltage; | |
1388 | ||
1389 | return err; | |
1390 | ||
1391 | } | |
1392 | ||
0f791fda | 1393 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr) |
f2119df6 AN |
1394 | { |
1395 | struct mmc_command cmd = {0}; | |
1396 | int err = 0; | |
0797e5f1 | 1397 | u32 clock; |
f2119df6 AN |
1398 | |
1399 | BUG_ON(!host); | |
1400 | ||
1401 | /* | |
1402 | * Send CMD11 only if the request is to switch the card to | |
1403 | * 1.8V signalling. | |
1404 | */ | |
0797e5f1 JR |
1405 | if (signal_voltage == MMC_SIGNAL_VOLTAGE_330) |
1406 | return __mmc_set_signal_voltage(host, signal_voltage); | |
f2119df6 | 1407 | |
0797e5f1 JR |
1408 | /* |
1409 | * If we cannot switch voltages, return failure so the caller | |
1410 | * can continue without UHS mode | |
1411 | */ | |
1412 | if (!host->ops->start_signal_voltage_switch) | |
1413 | return -EPERM; | |
1414 | if (!host->ops->card_busy) | |
1415 | pr_warning("%s: cannot verify signal voltage switch\n", | |
1416 | mmc_hostname(host)); | |
1417 | ||
1418 | cmd.opcode = SD_SWITCH_VOLTAGE; | |
1419 | cmd.arg = 0; | |
1420 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1421 | ||
1422 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1423 | if (err) | |
1424 | return err; | |
1425 | ||
1426 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1427 | return -EIO; | |
1428 | ||
1429 | mmc_host_clk_hold(host); | |
1430 | /* | |
1431 | * The card should drive cmd and dat[0:3] low immediately | |
1432 | * after the response of cmd11, but wait 1 ms to be sure | |
1433 | */ | |
1434 | mmc_delay(1); | |
1435 | if (host->ops->card_busy && !host->ops->card_busy(host)) { | |
1436 | err = -EAGAIN; | |
1437 | goto power_cycle; | |
1438 | } | |
1439 | /* | |
1440 | * During a signal voltage level switch, the clock must be gated | |
1441 | * for 5 ms according to the SD spec | |
1442 | */ | |
1443 | clock = host->ios.clock; | |
1444 | host->ios.clock = 0; | |
1445 | mmc_set_ios(host); | |
f2119df6 | 1446 | |
0797e5f1 JR |
1447 | if (__mmc_set_signal_voltage(host, signal_voltage)) { |
1448 | /* | |
1449 | * Voltages may not have been switched, but we've already | |
1450 | * sent CMD11, so a power cycle is required anyway | |
1451 | */ | |
1452 | err = -EAGAIN; | |
1453 | goto power_cycle; | |
f2119df6 AN |
1454 | } |
1455 | ||
0797e5f1 JR |
1456 | /* Keep clock gated for at least 5 ms */ |
1457 | mmc_delay(5); | |
1458 | host->ios.clock = clock; | |
1459 | mmc_set_ios(host); | |
1460 | ||
1461 | /* Wait for at least 1 ms according to spec */ | |
1462 | mmc_delay(1); | |
1463 | ||
1464 | /* | |
1465 | * Failure to switch is indicated by the card holding | |
1466 | * dat[0:3] low | |
1467 | */ | |
1468 | if (host->ops->card_busy && host->ops->card_busy(host)) | |
1469 | err = -EAGAIN; | |
1470 | ||
1471 | power_cycle: | |
1472 | if (err) { | |
1473 | pr_debug("%s: Signal voltage switch failed, " | |
1474 | "power cycling card\n", mmc_hostname(host)); | |
0f791fda | 1475 | mmc_power_cycle(host, ocr); |
0797e5f1 JR |
1476 | } |
1477 | ||
1478 | mmc_host_clk_release(host); | |
1479 | ||
1480 | return err; | |
f2119df6 AN |
1481 | } |
1482 | ||
b57c43ad | 1483 | /* |
7ea239d9 | 1484 | * Select timing parameters for host. |
b57c43ad | 1485 | */ |
7ea239d9 | 1486 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1487 | { |
778e277c | 1488 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1489 | host->ios.timing = timing; |
1490 | mmc_set_ios(host); | |
778e277c | 1491 | mmc_host_clk_release(host); |
b57c43ad PO |
1492 | } |
1493 | ||
d6d50a15 AN |
1494 | /* |
1495 | * Select appropriate driver type for host. | |
1496 | */ | |
1497 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1498 | { | |
778e277c | 1499 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1500 | host->ios.drv_type = drv_type; |
1501 | mmc_set_ios(host); | |
778e277c | 1502 | mmc_host_clk_release(host); |
d6d50a15 AN |
1503 | } |
1504 | ||
1da177e4 | 1505 | /* |
45f8245b RK |
1506 | * Apply power to the MMC stack. This is a two-stage process. |
1507 | * First, we enable power to the card without the clock running. | |
1508 | * We then wait a bit for the power to stabilise. Finally, | |
1509 | * enable the bus drivers and clock to the card. | |
1510 | * | |
1511 | * We must _NOT_ enable the clock prior to power stablising. | |
1512 | * | |
1513 | * If a host does all the power sequencing itself, ignore the | |
1514 | * initial MMC_POWER_UP stage. | |
1da177e4 | 1515 | */ |
4a065193 | 1516 | void mmc_power_up(struct mmc_host *host, u32 ocr) |
1da177e4 | 1517 | { |
fa550189 UH |
1518 | if (host->ios.power_mode == MMC_POWER_ON) |
1519 | return; | |
1520 | ||
778e277c MW |
1521 | mmc_host_clk_hold(host); |
1522 | ||
4a065193 | 1523 | host->ios.vdd = fls(ocr) - 1; |
44669034 | 1524 | if (mmc_host_is_spi(host)) |
af517150 | 1525 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1526 | else |
af517150 | 1527 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1528 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1529 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1530 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1531 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1532 | mmc_set_ios(host); |
1da177e4 | 1533 | |
108ecc4c | 1534 | /* Set signal voltage to 3.3V */ |
567c8903 | 1535 | __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330); |
108ecc4c | 1536 | |
f9996aee PO |
1537 | /* |
1538 | * This delay should be sufficient to allow the power supply | |
1539 | * to reach the minimum voltage. | |
1540 | */ | |
79bccc5a | 1541 | mmc_delay(10); |
1da177e4 | 1542 | |
88ae8b86 | 1543 | host->ios.clock = host->f_init; |
8dfd0374 | 1544 | |
1da177e4 | 1545 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1546 | mmc_set_ios(host); |
1da177e4 | 1547 | |
f9996aee PO |
1548 | /* |
1549 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1550 | * time required to reach a stable voltage. | |
1551 | */ | |
79bccc5a | 1552 | mmc_delay(10); |
778e277c MW |
1553 | |
1554 | mmc_host_clk_release(host); | |
1da177e4 LT |
1555 | } |
1556 | ||
7f7e4129 | 1557 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1558 | { |
fa550189 UH |
1559 | if (host->ios.power_mode == MMC_POWER_OFF) |
1560 | return; | |
1561 | ||
778e277c MW |
1562 | mmc_host_clk_hold(host); |
1563 | ||
1da177e4 LT |
1564 | host->ios.clock = 0; |
1565 | host->ios.vdd = 0; | |
b33d46c3 | 1566 | |
af517150 DB |
1567 | if (!mmc_host_is_spi(host)) { |
1568 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1569 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1570 | } | |
1da177e4 | 1571 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1572 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1573 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1574 | mmc_set_ios(host); |
778e277c | 1575 | |
041beb1d DD |
1576 | /* |
1577 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1578 | * XO-1.5, require a short delay after poweroff before the card | |
1579 | * can be successfully turned on again. | |
1580 | */ | |
1581 | mmc_delay(1); | |
1582 | ||
778e277c | 1583 | mmc_host_clk_release(host); |
1da177e4 LT |
1584 | } |
1585 | ||
4a065193 | 1586 | void mmc_power_cycle(struct mmc_host *host, u32 ocr) |
276e090f JR |
1587 | { |
1588 | mmc_power_off(host); | |
1589 | /* Wait at least 1 ms according to SD spec */ | |
1590 | mmc_delay(1); | |
4a065193 | 1591 | mmc_power_up(host, ocr); |
276e090f JR |
1592 | } |
1593 | ||
39361851 AB |
1594 | /* |
1595 | * Cleanup when the last reference to the bus operator is dropped. | |
1596 | */ | |
261172fd | 1597 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1598 | { |
1599 | BUG_ON(!host); | |
1600 | BUG_ON(host->bus_refs); | |
1601 | BUG_ON(!host->bus_dead); | |
1602 | ||
1603 | host->bus_ops = NULL; | |
1604 | } | |
1605 | ||
1606 | /* | |
1607 | * Increase reference count of bus operator | |
1608 | */ | |
1609 | static inline void mmc_bus_get(struct mmc_host *host) | |
1610 | { | |
1611 | unsigned long flags; | |
1612 | ||
1613 | spin_lock_irqsave(&host->lock, flags); | |
1614 | host->bus_refs++; | |
1615 | spin_unlock_irqrestore(&host->lock, flags); | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * Decrease reference count of bus operator and free it if | |
1620 | * it is the last reference. | |
1621 | */ | |
1622 | static inline void mmc_bus_put(struct mmc_host *host) | |
1623 | { | |
1624 | unsigned long flags; | |
1625 | ||
1626 | spin_lock_irqsave(&host->lock, flags); | |
1627 | host->bus_refs--; | |
1628 | if ((host->bus_refs == 0) && host->bus_ops) | |
1629 | __mmc_release_bus(host); | |
1630 | spin_unlock_irqrestore(&host->lock, flags); | |
1631 | } | |
1632 | ||
1da177e4 | 1633 | /* |
7ea239d9 PO |
1634 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1635 | * host at any given time. | |
1da177e4 | 1636 | */ |
7ea239d9 | 1637 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1638 | { |
7ea239d9 | 1639 | unsigned long flags; |
e45a1bd2 | 1640 | |
7ea239d9 PO |
1641 | BUG_ON(!host); |
1642 | BUG_ON(!ops); | |
b855885e | 1643 | |
d84075c8 | 1644 | WARN_ON(!host->claimed); |
bce40a36 | 1645 | |
7ea239d9 | 1646 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1647 | |
7ea239d9 PO |
1648 | BUG_ON(host->bus_ops); |
1649 | BUG_ON(host->bus_refs); | |
b57c43ad | 1650 | |
7ea239d9 PO |
1651 | host->bus_ops = ops; |
1652 | host->bus_refs = 1; | |
1653 | host->bus_dead = 0; | |
b57c43ad | 1654 | |
7ea239d9 | 1655 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1656 | } |
1657 | ||
7ea239d9 | 1658 | /* |
7f7e4129 | 1659 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1660 | */ |
1661 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1662 | { |
7ea239d9 | 1663 | unsigned long flags; |
7ccd266e | 1664 | |
7ea239d9 | 1665 | BUG_ON(!host); |
7ccd266e | 1666 | |
d84075c8 PO |
1667 | WARN_ON(!host->claimed); |
1668 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1669 | |
7ea239d9 | 1670 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1671 | |
7ea239d9 | 1672 | host->bus_dead = 1; |
7ccd266e | 1673 | |
7ea239d9 | 1674 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1675 | |
7ea239d9 | 1676 | mmc_bus_put(host); |
1da177e4 LT |
1677 | } |
1678 | ||
bbd43682 UH |
1679 | static void _mmc_detect_change(struct mmc_host *host, unsigned long delay, |
1680 | bool cd_irq) | |
1681 | { | |
1682 | #ifdef CONFIG_MMC_DEBUG | |
1683 | unsigned long flags; | |
1684 | spin_lock_irqsave(&host->lock, flags); | |
1685 | WARN_ON(host->removed); | |
1686 | spin_unlock_irqrestore(&host->lock, flags); | |
1687 | #endif | |
1688 | ||
1689 | /* | |
1690 | * If the device is configured as wakeup, we prevent a new sleep for | |
1691 | * 5 s to give provision for user space to consume the event. | |
1692 | */ | |
1693 | if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) && | |
1694 | device_can_wakeup(mmc_dev(host))) | |
1695 | pm_wakeup_event(mmc_dev(host), 5000); | |
1696 | ||
1697 | host->detect_change = 1; | |
1698 | mmc_schedule_delayed_work(&host->detect, delay); | |
1699 | } | |
1700 | ||
1da177e4 LT |
1701 | /** |
1702 | * mmc_detect_change - process change of state on a MMC socket | |
1703 | * @host: host which changed state. | |
8dc00335 | 1704 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1705 | * |
67a61c48 PO |
1706 | * MMC drivers should call this when they detect a card has been |
1707 | * inserted or removed. The MMC layer will confirm that any | |
1708 | * present card is still functional, and initialize any newly | |
1709 | * inserted. | |
1da177e4 | 1710 | */ |
8dc00335 | 1711 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1712 | { |
bbd43682 | 1713 | _mmc_detect_change(host, delay, true); |
1da177e4 | 1714 | } |
1da177e4 LT |
1715 | EXPORT_SYMBOL(mmc_detect_change); |
1716 | ||
dfe86cba AH |
1717 | void mmc_init_erase(struct mmc_card *card) |
1718 | { | |
1719 | unsigned int sz; | |
1720 | ||
1721 | if (is_power_of_2(card->erase_size)) | |
1722 | card->erase_shift = ffs(card->erase_size) - 1; | |
1723 | else | |
1724 | card->erase_shift = 0; | |
1725 | ||
1726 | /* | |
1727 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1728 | * card. That is not desirable because it can take a long time | |
1729 | * (minutes) potentially delaying more important I/O, and also the | |
1730 | * timeout calculations become increasingly hugely over-estimated. | |
1731 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1732 | * to that size and alignment. | |
1733 | * | |
1734 | * For SD cards that define Allocation Unit size, limit erases to one | |
1735 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1736 | * Erase Size, whether it is switched on or not, limit to that size. | |
1737 | * Otherwise just have a stab at a good value. For modern cards it | |
1738 | * will end up being 4MiB. Note that if the value is too small, it | |
1739 | * can end up taking longer to erase. | |
1740 | */ | |
1741 | if (mmc_card_sd(card) && card->ssr.au) { | |
1742 | card->pref_erase = card->ssr.au; | |
1743 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1744 | } else if (card->ext_csd.hc_erase_size) { | |
1745 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1746 | } else { | |
1747 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1748 | if (sz < 128) | |
1749 | card->pref_erase = 512 * 1024 / 512; | |
1750 | else if (sz < 512) | |
1751 | card->pref_erase = 1024 * 1024 / 512; | |
1752 | else if (sz < 1024) | |
1753 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1754 | else | |
1755 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1756 | if (card->pref_erase < card->erase_size) | |
1757 | card->pref_erase = card->erase_size; | |
1758 | else { | |
1759 | sz = card->pref_erase % card->erase_size; | |
1760 | if (sz) | |
1761 | card->pref_erase += card->erase_size - sz; | |
1762 | } | |
1763 | } | |
1764 | } | |
1765 | ||
eaa02f75 AW |
1766 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1767 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1768 | { |
1769 | unsigned int erase_timeout; | |
1770 | ||
7194efb8 AH |
1771 | if (arg == MMC_DISCARD_ARG || |
1772 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
1773 | erase_timeout = card->ext_csd.trim_timeout; | |
1774 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
1775 | /* High Capacity Erase Group Size uses HC timeouts */ |
1776 | if (arg == MMC_TRIM_ARG) | |
1777 | erase_timeout = card->ext_csd.trim_timeout; | |
1778 | else | |
1779 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1780 | } else { | |
1781 | /* CSD Erase Group Size uses write timeout */ | |
1782 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1783 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1784 | unsigned int timeout_us; | |
1785 | ||
1786 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1787 | if (card->csd.tacc_ns < 1000000) | |
1788 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1789 | else | |
1790 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1791 | ||
1792 | /* | |
1793 | * ios.clock is only a target. The real clock rate might be | |
1794 | * less but not that much less, so fudge it by multiplying by 2. | |
1795 | */ | |
1796 | timeout_clks <<= 1; | |
1797 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1798 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1799 | |
1800 | erase_timeout = timeout_us / 1000; | |
1801 | ||
1802 | /* | |
1803 | * Theoretically, the calculation could underflow so round up | |
1804 | * to 1ms in that case. | |
1805 | */ | |
1806 | if (!erase_timeout) | |
1807 | erase_timeout = 1; | |
1808 | } | |
1809 | ||
1810 | /* Multiplier for secure operations */ | |
1811 | if (arg & MMC_SECURE_ARGS) { | |
1812 | if (arg == MMC_SECURE_ERASE_ARG) | |
1813 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1814 | else | |
1815 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1816 | } | |
1817 | ||
1818 | erase_timeout *= qty; | |
1819 | ||
1820 | /* | |
1821 | * Ensure at least a 1 second timeout for SPI as per | |
1822 | * 'mmc_set_data_timeout()' | |
1823 | */ | |
1824 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1825 | erase_timeout = 1000; | |
1826 | ||
eaa02f75 | 1827 | return erase_timeout; |
dfe86cba AH |
1828 | } |
1829 | ||
eaa02f75 AW |
1830 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1831 | unsigned int arg, | |
1832 | unsigned int qty) | |
dfe86cba | 1833 | { |
eaa02f75 AW |
1834 | unsigned int erase_timeout; |
1835 | ||
dfe86cba AH |
1836 | if (card->ssr.erase_timeout) { |
1837 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1838 | erase_timeout = card->ssr.erase_timeout * qty + |
1839 | card->ssr.erase_offset; | |
dfe86cba AH |
1840 | } else { |
1841 | /* | |
1842 | * Erase timeout not specified in SD Status Register (SSR) so | |
1843 | * use 250ms per write block. | |
1844 | */ | |
eaa02f75 | 1845 | erase_timeout = 250 * qty; |
dfe86cba AH |
1846 | } |
1847 | ||
1848 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1849 | if (erase_timeout < 1000) |
1850 | erase_timeout = 1000; | |
1851 | ||
1852 | return erase_timeout; | |
dfe86cba AH |
1853 | } |
1854 | ||
eaa02f75 AW |
1855 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1856 | unsigned int arg, | |
1857 | unsigned int qty) | |
dfe86cba AH |
1858 | { |
1859 | if (mmc_card_sd(card)) | |
eaa02f75 | 1860 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1861 | else |
eaa02f75 | 1862 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1863 | } |
1864 | ||
1865 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1866 | unsigned int to, unsigned int arg) | |
1867 | { | |
1278dba1 | 1868 | struct mmc_command cmd = {0}; |
dfe86cba | 1869 | unsigned int qty = 0; |
8fee476b | 1870 | unsigned long timeout; |
dfe86cba AH |
1871 | int err; |
1872 | ||
1873 | /* | |
1874 | * qty is used to calculate the erase timeout which depends on how many | |
1875 | * erase groups (or allocation units in SD terminology) are affected. | |
1876 | * We count erasing part of an erase group as one erase group. | |
1877 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1878 | * erase group size is almost certainly also power of 2, but it does not | |
1879 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1880 | * division in that case. SD may not specify an allocation unit size, | |
1881 | * in which case the timeout is based on the number of write blocks. | |
1882 | * | |
1883 | * Note that the timeout for secure trim 2 will only be correct if the | |
1884 | * number of erase groups specified is the same as the total of all | |
1885 | * preceding secure trim 1 commands. Since the power may have been | |
1886 | * lost since the secure trim 1 commands occurred, it is generally | |
1887 | * impossible to calculate the secure trim 2 timeout correctly. | |
1888 | */ | |
1889 | if (card->erase_shift) | |
1890 | qty += ((to >> card->erase_shift) - | |
1891 | (from >> card->erase_shift)) + 1; | |
1892 | else if (mmc_card_sd(card)) | |
1893 | qty += to - from + 1; | |
1894 | else | |
1895 | qty += ((to / card->erase_size) - | |
1896 | (from / card->erase_size)) + 1; | |
1897 | ||
1898 | if (!mmc_card_blockaddr(card)) { | |
1899 | from <<= 9; | |
1900 | to <<= 9; | |
1901 | } | |
1902 | ||
dfe86cba AH |
1903 | if (mmc_card_sd(card)) |
1904 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1905 | else | |
1906 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1907 | cmd.arg = from; | |
1908 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1909 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1910 | if (err) { | |
a3c76eb9 | 1911 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 1912 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 1913 | err = -EIO; |
dfe86cba AH |
1914 | goto out; |
1915 | } | |
1916 | ||
1917 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1918 | if (mmc_card_sd(card)) | |
1919 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1920 | else | |
1921 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1922 | cmd.arg = to; | |
1923 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1924 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1925 | if (err) { | |
a3c76eb9 | 1926 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 1927 | err, cmd.resp[0]); |
67716327 | 1928 | err = -EIO; |
dfe86cba AH |
1929 | goto out; |
1930 | } | |
1931 | ||
1932 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1933 | cmd.opcode = MMC_ERASE; | |
1934 | cmd.arg = arg; | |
1935 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1936 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1937 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1938 | if (err) { | |
a3c76eb9 | 1939 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
1940 | err, cmd.resp[0]); |
1941 | err = -EIO; | |
1942 | goto out; | |
1943 | } | |
1944 | ||
1945 | if (mmc_host_is_spi(card->host)) | |
1946 | goto out; | |
1947 | ||
8fee476b | 1948 | timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS); |
dfe86cba AH |
1949 | do { |
1950 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1951 | cmd.opcode = MMC_SEND_STATUS; | |
1952 | cmd.arg = card->rca << 16; | |
1953 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1954 | /* Do not retry else we can't see errors */ | |
1955 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1956 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 1957 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
1958 | err, cmd.resp[0]); |
1959 | err = -EIO; | |
1960 | goto out; | |
1961 | } | |
8fee476b TR |
1962 | |
1963 | /* Timeout if the device never becomes ready for data and | |
1964 | * never leaves the program state. | |
1965 | */ | |
1966 | if (time_after(jiffies, timeout)) { | |
1967 | pr_err("%s: Card stuck in programming state! %s\n", | |
1968 | mmc_hostname(card->host), __func__); | |
1969 | err = -EIO; | |
1970 | goto out; | |
1971 | } | |
1972 | ||
dfe86cba | 1973 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || |
8fee476b | 1974 | (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)); |
dfe86cba AH |
1975 | out: |
1976 | return err; | |
1977 | } | |
1978 | ||
1979 | /** | |
1980 | * mmc_erase - erase sectors. | |
1981 | * @card: card to erase | |
1982 | * @from: first sector to erase | |
1983 | * @nr: number of sectors to erase | |
1984 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1985 | * | |
1986 | * Caller must claim host before calling this function. | |
1987 | */ | |
1988 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1989 | unsigned int arg) | |
1990 | { | |
1991 | unsigned int rem, to = from + nr; | |
1992 | ||
1993 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1994 | !(card->csd.cmdclass & CCC_ERASE)) | |
1995 | return -EOPNOTSUPP; | |
1996 | ||
1997 | if (!card->erase_size) | |
1998 | return -EOPNOTSUPP; | |
1999 | ||
2000 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
2001 | return -EOPNOTSUPP; | |
2002 | ||
2003 | if ((arg & MMC_SECURE_ARGS) && | |
2004 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
2005 | return -EOPNOTSUPP; | |
2006 | ||
2007 | if ((arg & MMC_TRIM_ARGS) && | |
2008 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
2009 | return -EOPNOTSUPP; | |
2010 | ||
2011 | if (arg == MMC_SECURE_ERASE_ARG) { | |
2012 | if (from % card->erase_size || nr % card->erase_size) | |
2013 | return -EINVAL; | |
2014 | } | |
2015 | ||
2016 | if (arg == MMC_ERASE_ARG) { | |
2017 | rem = from % card->erase_size; | |
2018 | if (rem) { | |
2019 | rem = card->erase_size - rem; | |
2020 | from += rem; | |
2021 | if (nr > rem) | |
2022 | nr -= rem; | |
2023 | else | |
2024 | return 0; | |
2025 | } | |
2026 | rem = nr % card->erase_size; | |
2027 | if (rem) | |
2028 | nr -= rem; | |
2029 | } | |
2030 | ||
2031 | if (nr == 0) | |
2032 | return 0; | |
2033 | ||
2034 | to = from + nr; | |
2035 | ||
2036 | if (to <= from) | |
2037 | return -EINVAL; | |
2038 | ||
2039 | /* 'from' and 'to' are inclusive */ | |
2040 | to -= 1; | |
2041 | ||
2042 | return mmc_do_erase(card, from, to, arg); | |
2043 | } | |
2044 | EXPORT_SYMBOL(mmc_erase); | |
2045 | ||
2046 | int mmc_can_erase(struct mmc_card *card) | |
2047 | { | |
2048 | if ((card->host->caps & MMC_CAP_ERASE) && | |
2049 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
2050 | return 1; | |
2051 | return 0; | |
2052 | } | |
2053 | EXPORT_SYMBOL(mmc_can_erase); | |
2054 | ||
2055 | int mmc_can_trim(struct mmc_card *card) | |
2056 | { | |
2057 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
2058 | return 1; | |
2059 | return 0; | |
2060 | } | |
2061 | EXPORT_SYMBOL(mmc_can_trim); | |
2062 | ||
b3bf9153 KP |
2063 | int mmc_can_discard(struct mmc_card *card) |
2064 | { | |
2065 | /* | |
2066 | * As there's no way to detect the discard support bit at v4.5 | |
2067 | * use the s/w feature support filed. | |
2068 | */ | |
2069 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
2070 | return 1; | |
2071 | return 0; | |
2072 | } | |
2073 | EXPORT_SYMBOL(mmc_can_discard); | |
2074 | ||
d9ddd629 KP |
2075 | int mmc_can_sanitize(struct mmc_card *card) |
2076 | { | |
28302812 AH |
2077 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
2078 | return 0; | |
d9ddd629 KP |
2079 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
2080 | return 1; | |
2081 | return 0; | |
2082 | } | |
2083 | EXPORT_SYMBOL(mmc_can_sanitize); | |
2084 | ||
dfe86cba AH |
2085 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
2086 | { | |
2087 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
2088 | return 1; | |
2089 | return 0; | |
2090 | } | |
2091 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
2092 | ||
2093 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
2094 | unsigned int nr) | |
2095 | { | |
2096 | if (!card->erase_size) | |
2097 | return 0; | |
2098 | if (from % card->erase_size || nr % card->erase_size) | |
2099 | return 0; | |
2100 | return 1; | |
2101 | } | |
2102 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 2103 | |
e056a1b5 AH |
2104 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
2105 | unsigned int arg) | |
2106 | { | |
2107 | struct mmc_host *host = card->host; | |
2108 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
2109 | unsigned int last_timeout = 0; | |
2110 | ||
2111 | if (card->erase_shift) | |
2112 | max_qty = UINT_MAX >> card->erase_shift; | |
2113 | else if (mmc_card_sd(card)) | |
2114 | max_qty = UINT_MAX; | |
2115 | else | |
2116 | max_qty = UINT_MAX / card->erase_size; | |
2117 | ||
2118 | /* Find the largest qty with an OK timeout */ | |
2119 | do { | |
2120 | y = 0; | |
2121 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
2122 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
2123 | if (timeout > host->max_discard_to) | |
2124 | break; | |
2125 | if (timeout < last_timeout) | |
2126 | break; | |
2127 | last_timeout = timeout; | |
2128 | y = x; | |
2129 | } | |
2130 | qty += y; | |
2131 | } while (y); | |
2132 | ||
2133 | if (!qty) | |
2134 | return 0; | |
2135 | ||
2136 | if (qty == 1) | |
2137 | return 1; | |
2138 | ||
2139 | /* Convert qty to sectors */ | |
2140 | if (card->erase_shift) | |
2141 | max_discard = --qty << card->erase_shift; | |
2142 | else if (mmc_card_sd(card)) | |
2143 | max_discard = qty; | |
2144 | else | |
2145 | max_discard = --qty * card->erase_size; | |
2146 | ||
2147 | return max_discard; | |
2148 | } | |
2149 | ||
2150 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
2151 | { | |
2152 | struct mmc_host *host = card->host; | |
2153 | unsigned int max_discard, max_trim; | |
2154 | ||
2155 | if (!host->max_discard_to) | |
2156 | return UINT_MAX; | |
2157 | ||
2158 | /* | |
2159 | * Without erase_group_def set, MMC erase timeout depends on clock | |
2160 | * frequence which can change. In that case, the best choice is | |
2161 | * just the preferred erase size. | |
2162 | */ | |
2163 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
2164 | return card->pref_erase; | |
2165 | ||
2166 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
2167 | if (mmc_can_trim(card)) { | |
2168 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
2169 | if (max_trim < max_discard) | |
2170 | max_discard = max_trim; | |
2171 | } else if (max_discard < card->erase_size) { | |
2172 | max_discard = 0; | |
2173 | } | |
2174 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
2175 | mmc_hostname(host), max_discard, host->max_discard_to); | |
2176 | return max_discard; | |
2177 | } | |
2178 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
2179 | ||
0f8d8ea6 AH |
2180 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
2181 | { | |
1278dba1 | 2182 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
2183 | |
2184 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
2185 | return 0; | |
2186 | ||
0f8d8ea6 AH |
2187 | cmd.opcode = MMC_SET_BLOCKLEN; |
2188 | cmd.arg = blocklen; | |
2189 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2190 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2191 | } | |
2192 | EXPORT_SYMBOL(mmc_set_blocklen); | |
2193 | ||
67c79db8 LP |
2194 | int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount, |
2195 | bool is_rel_write) | |
2196 | { | |
2197 | struct mmc_command cmd = {0}; | |
2198 | ||
2199 | cmd.opcode = MMC_SET_BLOCK_COUNT; | |
2200 | cmd.arg = blockcount & 0x0000FFFF; | |
2201 | if (is_rel_write) | |
2202 | cmd.arg |= 1 << 31; | |
2203 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2204 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2205 | } | |
2206 | EXPORT_SYMBOL(mmc_set_blockcount); | |
2207 | ||
b2499518 AH |
2208 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
2209 | { | |
2210 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2211 | return; | |
2212 | mmc_host_clk_hold(host); | |
2213 | host->ops->hw_reset(host); | |
2214 | mmc_host_clk_release(host); | |
2215 | } | |
2216 | ||
2217 | int mmc_can_reset(struct mmc_card *card) | |
2218 | { | |
2219 | u8 rst_n_function; | |
2220 | ||
2221 | if (!mmc_card_mmc(card)) | |
2222 | return 0; | |
2223 | rst_n_function = card->ext_csd.rst_n_function; | |
2224 | if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED) | |
2225 | return 0; | |
2226 | return 1; | |
2227 | } | |
2228 | EXPORT_SYMBOL(mmc_can_reset); | |
2229 | ||
2230 | static int mmc_do_hw_reset(struct mmc_host *host, int check) | |
2231 | { | |
2232 | struct mmc_card *card = host->card; | |
2233 | ||
2234 | if (!host->bus_ops->power_restore) | |
2235 | return -EOPNOTSUPP; | |
2236 | ||
2237 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2238 | return -EOPNOTSUPP; | |
2239 | ||
2240 | if (!card) | |
2241 | return -EINVAL; | |
2242 | ||
2243 | if (!mmc_can_reset(card)) | |
2244 | return -EOPNOTSUPP; | |
2245 | ||
2246 | mmc_host_clk_hold(host); | |
2247 | mmc_set_clock(host, host->f_init); | |
2248 | ||
2249 | host->ops->hw_reset(host); | |
2250 | ||
2251 | /* If the reset has happened, then a status command will fail */ | |
2252 | if (check) { | |
2253 | struct mmc_command cmd = {0}; | |
2254 | int err; | |
2255 | ||
2256 | cmd.opcode = MMC_SEND_STATUS; | |
2257 | if (!mmc_host_is_spi(card->host)) | |
2258 | cmd.arg = card->rca << 16; | |
2259 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
2260 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2261 | if (!err) { | |
2262 | mmc_host_clk_release(host); | |
2263 | return -ENOSYS; | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR); | |
2268 | if (mmc_host_is_spi(host)) { | |
2269 | host->ios.chip_select = MMC_CS_HIGH; | |
2270 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
2271 | } else { | |
2272 | host->ios.chip_select = MMC_CS_DONTCARE; | |
2273 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
2274 | } | |
2275 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
2276 | host->ios.timing = MMC_TIMING_LEGACY; | |
2277 | mmc_set_ios(host); | |
2278 | ||
2279 | mmc_host_clk_release(host); | |
2280 | ||
2281 | return host->bus_ops->power_restore(host); | |
2282 | } | |
2283 | ||
2284 | int mmc_hw_reset(struct mmc_host *host) | |
2285 | { | |
2286 | return mmc_do_hw_reset(host, 0); | |
2287 | } | |
2288 | EXPORT_SYMBOL(mmc_hw_reset); | |
2289 | ||
2290 | int mmc_hw_reset_check(struct mmc_host *host) | |
2291 | { | |
2292 | return mmc_do_hw_reset(host, 1); | |
2293 | } | |
2294 | EXPORT_SYMBOL(mmc_hw_reset_check); | |
2295 | ||
807e8e40 AR |
2296 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2297 | { | |
2298 | host->f_init = freq; | |
2299 | ||
2300 | #ifdef CONFIG_MMC_DEBUG | |
2301 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2302 | mmc_hostname(host), __func__, host->f_init); | |
2303 | #endif | |
4a065193 | 2304 | mmc_power_up(host, host->ocr_avail); |
2f94e55a | 2305 | |
b2499518 AH |
2306 | /* |
2307 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2308 | * do a hardware reset if possible. | |
2309 | */ | |
2310 | mmc_hw_reset_for_init(host); | |
2311 | ||
2f94e55a PR |
2312 | /* |
2313 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2314 | * if the card is being re-initialized, just send it. CMD52 | |
2315 | * should be ignored by SD/eMMC cards. | |
2316 | */ | |
807e8e40 AR |
2317 | sdio_reset(host); |
2318 | mmc_go_idle(host); | |
2319 | ||
2320 | mmc_send_if_cond(host, host->ocr_avail); | |
2321 | ||
2322 | /* Order's important: probe SDIO, then SD, then MMC */ | |
2323 | if (!mmc_attach_sdio(host)) | |
2324 | return 0; | |
2325 | if (!mmc_attach_sd(host)) | |
2326 | return 0; | |
2327 | if (!mmc_attach_mmc(host)) | |
2328 | return 0; | |
2329 | ||
2330 | mmc_power_off(host); | |
2331 | return -EIO; | |
2332 | } | |
2333 | ||
d3049504 AH |
2334 | int _mmc_detect_card_removed(struct mmc_host *host) |
2335 | { | |
2336 | int ret; | |
2337 | ||
2338 | if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive) | |
2339 | return 0; | |
2340 | ||
2341 | if (!host->card || mmc_card_removed(host->card)) | |
2342 | return 1; | |
2343 | ||
2344 | ret = host->bus_ops->alive(host); | |
1450734e KL |
2345 | |
2346 | /* | |
2347 | * Card detect status and alive check may be out of sync if card is | |
2348 | * removed slowly, when card detect switch changes while card/slot | |
2349 | * pads are still contacted in hardware (refer to "SD Card Mechanical | |
2350 | * Addendum, Appendix C: Card Detection Switch"). So reschedule a | |
2351 | * detect work 200ms later for this case. | |
2352 | */ | |
2353 | if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) { | |
2354 | mmc_detect_change(host, msecs_to_jiffies(200)); | |
2355 | pr_debug("%s: card removed too slowly\n", mmc_hostname(host)); | |
2356 | } | |
2357 | ||
d3049504 AH |
2358 | if (ret) { |
2359 | mmc_card_set_removed(host->card); | |
2360 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2361 | } | |
2362 | ||
2363 | return ret; | |
2364 | } | |
2365 | ||
2366 | int mmc_detect_card_removed(struct mmc_host *host) | |
2367 | { | |
2368 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2369 | int ret; |
d3049504 AH |
2370 | |
2371 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2372 | |
2373 | if (!card) | |
2374 | return 1; | |
2375 | ||
2376 | ret = mmc_card_removed(card); | |
d3049504 AH |
2377 | /* |
2378 | * The card will be considered unchanged unless we have been asked to | |
2379 | * detect a change or host requires polling to provide card detection. | |
2380 | */ | |
b6891679 | 2381 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) |
f0cc9cf9 | 2382 | return ret; |
d3049504 AH |
2383 | |
2384 | host->detect_change = 0; | |
f0cc9cf9 UH |
2385 | if (!ret) { |
2386 | ret = _mmc_detect_card_removed(host); | |
b6891679 | 2387 | if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) { |
f0cc9cf9 UH |
2388 | /* |
2389 | * Schedule a detect work as soon as possible to let a | |
2390 | * rescan handle the card removal. | |
2391 | */ | |
2392 | cancel_delayed_work(&host->detect); | |
bbd43682 | 2393 | _mmc_detect_change(host, 0, false); |
f0cc9cf9 UH |
2394 | } |
2395 | } | |
d3049504 | 2396 | |
f0cc9cf9 | 2397 | return ret; |
d3049504 AH |
2398 | } |
2399 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2400 | ||
b93931a6 | 2401 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2402 | { |
c4028958 DH |
2403 | struct mmc_host *host = |
2404 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2405 | int i; |
4c2ef25f | 2406 | |
807e8e40 | 2407 | if (host->rescan_disable) |
4c2ef25f | 2408 | return; |
1da177e4 | 2409 | |
3339d1e3 JR |
2410 | /* If there is a non-removable card registered, only scan once */ |
2411 | if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered) | |
2412 | return; | |
2413 | host->rescan_entered = 1; | |
2414 | ||
7ea239d9 | 2415 | mmc_bus_get(host); |
b855885e | 2416 | |
30201e7f OBC |
2417 | /* |
2418 | * if there is a _removable_ card registered, check whether it is | |
2419 | * still present | |
2420 | */ | |
2421 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 2422 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
2423 | host->bus_ops->detect(host); |
2424 | ||
d3049504 AH |
2425 | host->detect_change = 0; |
2426 | ||
c5841798 CB |
2427 | /* |
2428 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2429 | * the card is no longer present. | |
2430 | */ | |
94d89efb | 2431 | mmc_bus_put(host); |
94d89efb JS |
2432 | mmc_bus_get(host); |
2433 | ||
2434 | /* if there still is a card present, stop here */ | |
2435 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2436 | mmc_bus_put(host); |
94d89efb JS |
2437 | goto out; |
2438 | } | |
1da177e4 | 2439 | |
94d89efb JS |
2440 | /* |
2441 | * Only we can add a new handler, so it's safe to | |
2442 | * release the lock here. | |
2443 | */ | |
2444 | mmc_bus_put(host); | |
1da177e4 | 2445 | |
c1b55bfc SH |
2446 | if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd && |
2447 | host->ops->get_cd(host) == 0) { | |
fa550189 UH |
2448 | mmc_claim_host(host); |
2449 | mmc_power_off(host); | |
2450 | mmc_release_host(host); | |
94d89efb | 2451 | goto out; |
fa550189 | 2452 | } |
1da177e4 | 2453 | |
807e8e40 | 2454 | mmc_claim_host(host); |
88ae8b86 | 2455 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2456 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2457 | break; | |
06b2233a | 2458 | if (freqs[i] <= host->f_min) |
807e8e40 | 2459 | break; |
88ae8b86 | 2460 | } |
807e8e40 AR |
2461 | mmc_release_host(host); |
2462 | ||
2463 | out: | |
28f52482 AV |
2464 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2465 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2466 | } |
2467 | ||
b93931a6 | 2468 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2469 | { |
fa550189 | 2470 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2471 | host->rescan_disable = 0; |
a08b17be AH |
2472 | if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP) |
2473 | mmc_power_off(host); | |
2474 | else | |
4a065193 | 2475 | mmc_power_up(host, host->ocr_avail); |
bbd43682 | 2476 | _mmc_detect_change(host, 0, false); |
1da177e4 LT |
2477 | } |
2478 | ||
b93931a6 | 2479 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2480 | { |
3b91e550 | 2481 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2482 | unsigned long flags; |
2483 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2484 | host->removed = 1; |
1efd48b3 | 2485 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
2486 | #endif |
2487 | ||
d9adcc12 | 2488 | host->rescan_disable = 1; |
d9bcbf34 | 2489 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
2490 | mmc_flush_scheduled_work(); |
2491 | ||
da68c4eb NP |
2492 | /* clear pm flags now and let card drivers set them as needed */ |
2493 | host->pm_flags = 0; | |
2494 | ||
7ea239d9 PO |
2495 | mmc_bus_get(host); |
2496 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2497 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2498 | host->bus_ops->remove(host); |
7ea239d9 PO |
2499 | mmc_claim_host(host); |
2500 | mmc_detach_bus(host); | |
7f7e4129 | 2501 | mmc_power_off(host); |
7ea239d9 | 2502 | mmc_release_host(host); |
53509f0f DK |
2503 | mmc_bus_put(host); |
2504 | return; | |
1da177e4 | 2505 | } |
7ea239d9 PO |
2506 | mmc_bus_put(host); |
2507 | ||
2508 | BUG_ON(host->card); | |
1da177e4 LT |
2509 | |
2510 | mmc_power_off(host); | |
2511 | } | |
2512 | ||
12ae637f | 2513 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2514 | { |
12ae637f OBC |
2515 | int ret = 0; |
2516 | ||
bb9cab94 DD |
2517 | #ifdef CONFIG_MMC_DEBUG |
2518 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2519 | #endif | |
2520 | ||
eae1aeee AH |
2521 | mmc_bus_get(host); |
2522 | ||
2523 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2524 | mmc_bus_put(host); | |
12ae637f | 2525 | return -EINVAL; |
eae1aeee AH |
2526 | } |
2527 | ||
2528 | if (host->bus_ops->power_save) | |
12ae637f | 2529 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2530 | |
2531 | mmc_bus_put(host); | |
2532 | ||
2533 | mmc_power_off(host); | |
12ae637f OBC |
2534 | |
2535 | return ret; | |
eae1aeee AH |
2536 | } |
2537 | EXPORT_SYMBOL(mmc_power_save_host); | |
2538 | ||
12ae637f | 2539 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2540 | { |
12ae637f OBC |
2541 | int ret; |
2542 | ||
bb9cab94 DD |
2543 | #ifdef CONFIG_MMC_DEBUG |
2544 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2545 | #endif | |
2546 | ||
eae1aeee AH |
2547 | mmc_bus_get(host); |
2548 | ||
2549 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2550 | mmc_bus_put(host); | |
12ae637f | 2551 | return -EINVAL; |
eae1aeee AH |
2552 | } |
2553 | ||
69041150 | 2554 | mmc_power_up(host, host->card->ocr); |
12ae637f | 2555 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2556 | |
2557 | mmc_bus_put(host); | |
12ae637f OBC |
2558 | |
2559 | return ret; | |
eae1aeee AH |
2560 | } |
2561 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2562 | ||
881d1c25 SJ |
2563 | /* |
2564 | * Flush the cache to the non-volatile storage. | |
2565 | */ | |
2566 | int mmc_flush_cache(struct mmc_card *card) | |
2567 | { | |
2568 | struct mmc_host *host = card->host; | |
2569 | int err = 0; | |
2570 | ||
2571 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL)) | |
2572 | return err; | |
2573 | ||
2574 | if (mmc_card_mmc(card) && | |
2575 | (card->ext_csd.cache_size > 0) && | |
2576 | (card->ext_csd.cache_ctrl & 1)) { | |
2577 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2578 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2579 | if (err) | |
2580 | pr_err("%s: cache flush error %d\n", | |
2581 | mmc_hostname(card->host), err); | |
2582 | } | |
2583 | ||
2584 | return err; | |
2585 | } | |
2586 | EXPORT_SYMBOL(mmc_flush_cache); | |
2587 | ||
2588 | /* | |
2589 | * Turn the cache ON/OFF. | |
2590 | * Turning the cache OFF shall trigger flushing of the data | |
2591 | * to the non-volatile storage. | |
881d926d | 2592 | * This function should be called with host claimed |
881d1c25 SJ |
2593 | */ |
2594 | int mmc_cache_ctrl(struct mmc_host *host, u8 enable) | |
2595 | { | |
2596 | struct mmc_card *card = host->card; | |
8bc0678b | 2597 | unsigned int timeout; |
881d1c25 SJ |
2598 | int err = 0; |
2599 | ||
2600 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) || | |
2601 | mmc_card_is_removable(host)) | |
2602 | return err; | |
2603 | ||
2604 | if (card && mmc_card_mmc(card) && | |
2605 | (card->ext_csd.cache_size > 0)) { | |
2606 | enable = !!enable; | |
2607 | ||
8bc0678b SJ |
2608 | if (card->ext_csd.cache_ctrl ^ enable) { |
2609 | timeout = enable ? card->ext_csd.generic_cmd6_time : 0; | |
881d1c25 | 2610 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
8bc0678b SJ |
2611 | EXT_CSD_CACHE_CTRL, enable, timeout); |
2612 | if (err) | |
2613 | pr_err("%s: cache %s error %d\n", | |
2614 | mmc_hostname(card->host), | |
2615 | enable ? "on" : "off", | |
2616 | err); | |
2617 | else | |
2618 | card->ext_csd.cache_ctrl = enable; | |
2619 | } | |
881d1c25 SJ |
2620 | } |
2621 | ||
2622 | return err; | |
2623 | } | |
2624 | EXPORT_SYMBOL(mmc_cache_ctrl); | |
2625 | ||
1da177e4 LT |
2626 | #ifdef CONFIG_PM |
2627 | ||
4c2ef25f ML |
2628 | /* Do the card removal on suspend if card is assumed removeable |
2629 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2630 | to sync the card. | |
2631 | */ | |
2632 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2633 | unsigned long mode, void *unused) | |
2634 | { | |
2635 | struct mmc_host *host = container_of( | |
2636 | notify_block, struct mmc_host, pm_notify); | |
2637 | unsigned long flags; | |
810caddb | 2638 | int err = 0; |
4c2ef25f ML |
2639 | |
2640 | switch (mode) { | |
2641 | case PM_HIBERNATION_PREPARE: | |
2642 | case PM_SUSPEND_PREPARE: | |
4c2ef25f ML |
2643 | spin_lock_irqsave(&host->lock, flags); |
2644 | host->rescan_disable = 1; | |
2645 | spin_unlock_irqrestore(&host->lock, flags); | |
2646 | cancel_delayed_work_sync(&host->detect); | |
2647 | ||
810caddb UH |
2648 | if (!host->bus_ops) |
2649 | break; | |
2650 | ||
2651 | /* Validate prerequisites for suspend */ | |
2652 | if (host->bus_ops->pre_suspend) | |
2653 | err = host->bus_ops->pre_suspend(host); | |
2654 | if (!err && host->bus_ops->suspend) | |
4c2ef25f ML |
2655 | break; |
2656 | ||
0db13fc2 | 2657 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2658 | host->bus_ops->remove(host); |
0db13fc2 | 2659 | mmc_claim_host(host); |
4c2ef25f | 2660 | mmc_detach_bus(host); |
7f7e4129 | 2661 | mmc_power_off(host); |
4c2ef25f ML |
2662 | mmc_release_host(host); |
2663 | host->pm_flags = 0; | |
2664 | break; | |
2665 | ||
2666 | case PM_POST_SUSPEND: | |
2667 | case PM_POST_HIBERNATION: | |
274476f8 | 2668 | case PM_POST_RESTORE: |
4c2ef25f ML |
2669 | |
2670 | spin_lock_irqsave(&host->lock, flags); | |
2671 | host->rescan_disable = 0; | |
2672 | spin_unlock_irqrestore(&host->lock, flags); | |
bbd43682 | 2673 | _mmc_detect_change(host, 0, false); |
4c2ef25f ML |
2674 | |
2675 | } | |
2676 | ||
2677 | return 0; | |
2678 | } | |
1da177e4 LT |
2679 | #endif |
2680 | ||
2220eedf KD |
2681 | /** |
2682 | * mmc_init_context_info() - init synchronization context | |
2683 | * @host: mmc host | |
2684 | * | |
2685 | * Init struct context_info needed to implement asynchronous | |
2686 | * request mechanism, used by mmc core, host driver and mmc requests | |
2687 | * supplier. | |
2688 | */ | |
2689 | void mmc_init_context_info(struct mmc_host *host) | |
2690 | { | |
2691 | spin_lock_init(&host->context_info.lock); | |
2692 | host->context_info.is_new_req = false; | |
2693 | host->context_info.is_done_rcv = false; | |
2694 | host->context_info.is_waiting_last_req = false; | |
2695 | init_waitqueue_head(&host->context_info.wait); | |
2696 | } | |
2697 | ||
ffce2e7e PO |
2698 | static int __init mmc_init(void) |
2699 | { | |
2700 | int ret; | |
2701 | ||
0d9ee5b2 | 2702 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2703 | if (!workqueue) |
2704 | return -ENOMEM; | |
2705 | ||
2706 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2707 | if (ret) |
2708 | goto destroy_workqueue; | |
2709 | ||
2710 | ret = mmc_register_host_class(); | |
2711 | if (ret) | |
2712 | goto unregister_bus; | |
2713 | ||
2714 | ret = sdio_register_bus(); | |
2715 | if (ret) | |
2716 | goto unregister_host_class; | |
2717 | ||
2718 | return 0; | |
2719 | ||
2720 | unregister_host_class: | |
2721 | mmc_unregister_host_class(); | |
2722 | unregister_bus: | |
2723 | mmc_unregister_bus(); | |
2724 | destroy_workqueue: | |
2725 | destroy_workqueue(workqueue); | |
2726 | ||
ffce2e7e PO |
2727 | return ret; |
2728 | } | |
2729 | ||
2730 | static void __exit mmc_exit(void) | |
2731 | { | |
e29a7d73 | 2732 | sdio_unregister_bus(); |
ffce2e7e PO |
2733 | mmc_unregister_host_class(); |
2734 | mmc_unregister_bus(); | |
2735 | destroy_workqueue(workqueue); | |
2736 | } | |
2737 | ||
26074962 | 2738 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2739 | module_exit(mmc_exit); |
2740 | ||
1da177e4 | 2741 | MODULE_LICENSE("GPL"); |