Commit | Line | Data |
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1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
ad3868b2 | 6 | * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
af8350c7 | 21 | #include <linux/leds.h> |
b57c43ad | 22 | #include <linux/scatterlist.h> |
86e8286a | 23 | #include <linux/log2.h> |
5c13941a | 24 | #include <linux/regulator/consumer.h> |
e594573d | 25 | #include <linux/pm_runtime.h> |
35eb6db1 | 26 | #include <linux/suspend.h> |
1b676f70 PF |
27 | #include <linux/fault-inject.h> |
28 | #include <linux/random.h> | |
950d56ac | 29 | #include <linux/slab.h> |
1da177e4 LT |
30 | |
31 | #include <linux/mmc/card.h> | |
32 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
33 | #include <linux/mmc/mmc.h> |
34 | #include <linux/mmc/sd.h> | |
1da177e4 | 35 | |
aaac1b47 | 36 | #include "core.h" |
ffce2e7e PO |
37 | #include "bus.h" |
38 | #include "host.h" | |
e29a7d73 | 39 | #include "sdio_bus.h" |
da7fbe58 PO |
40 | |
41 | #include "mmc_ops.h" | |
42 | #include "sd_ops.h" | |
5c4e6f13 | 43 | #include "sdio_ops.h" |
1da177e4 | 44 | |
8fee476b TR |
45 | /* If the device is not responding */ |
46 | #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */ | |
47 | ||
950d56ac JC |
48 | /* |
49 | * Background operations can take a long time, depending on the housekeeping | |
50 | * operations the card has to perform. | |
51 | */ | |
52 | #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */ | |
53 | ||
ffce2e7e | 54 | static struct workqueue_struct *workqueue; |
fa550189 | 55 | static const unsigned freqs[] = { 400000, 300000, 200000, 100000 }; |
ffce2e7e | 56 | |
af517150 DB |
57 | /* |
58 | * Enabling software CRCs on the data blocks can be a significant (30%) | |
59 | * performance cost, and for other reasons may not always be desired. | |
60 | * So we allow it it to be disabled. | |
61 | */ | |
90ab5ee9 | 62 | bool use_spi_crc = 1; |
af517150 DB |
63 | module_param(use_spi_crc, bool, 0); |
64 | ||
bd68e083 BH |
65 | /* |
66 | * We normally treat cards as removed during suspend if they are not | |
67 | * known to be on a non-removable bus, to avoid the risk of writing | |
68 | * back data to a different card after resume. Allow this to be | |
69 | * overridden if necessary. | |
70 | */ | |
71 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
90ab5ee9 | 72 | bool mmc_assume_removable; |
bd68e083 | 73 | #else |
90ab5ee9 | 74 | bool mmc_assume_removable = 1; |
bd68e083 | 75 | #endif |
71d7d3d1 | 76 | EXPORT_SYMBOL(mmc_assume_removable); |
bd68e083 BH |
77 | module_param_named(removable, mmc_assume_removable, bool, 0644); |
78 | MODULE_PARM_DESC( | |
79 | removable, | |
80 | "MMC/SD cards are removable and may be removed during suspend"); | |
81 | ||
ffce2e7e PO |
82 | /* |
83 | * Internal function. Schedule delayed work in the MMC work queue. | |
84 | */ | |
85 | static int mmc_schedule_delayed_work(struct delayed_work *work, | |
86 | unsigned long delay) | |
87 | { | |
88 | return queue_delayed_work(workqueue, work, delay); | |
89 | } | |
90 | ||
91 | /* | |
92 | * Internal function. Flush all scheduled work from the MMC work queue. | |
93 | */ | |
94 | static void mmc_flush_scheduled_work(void) | |
95 | { | |
96 | flush_workqueue(workqueue); | |
97 | } | |
98 | ||
1b676f70 PF |
99 | #ifdef CONFIG_FAIL_MMC_REQUEST |
100 | ||
101 | /* | |
102 | * Internal function. Inject random data errors. | |
103 | * If mmc_data is NULL no errors are injected. | |
104 | */ | |
105 | static void mmc_should_fail_request(struct mmc_host *host, | |
106 | struct mmc_request *mrq) | |
107 | { | |
108 | struct mmc_command *cmd = mrq->cmd; | |
109 | struct mmc_data *data = mrq->data; | |
110 | static const int data_errors[] = { | |
111 | -ETIMEDOUT, | |
112 | -EILSEQ, | |
113 | -EIO, | |
114 | }; | |
115 | ||
116 | if (!data) | |
117 | return; | |
118 | ||
119 | if (cmd->error || data->error || | |
120 | !should_fail(&host->fail_mmc_request, data->blksz * data->blocks)) | |
121 | return; | |
122 | ||
2e744fcb AM |
123 | data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)]; |
124 | data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9; | |
1b676f70 PF |
125 | } |
126 | ||
127 | #else /* CONFIG_FAIL_MMC_REQUEST */ | |
128 | ||
129 | static inline void mmc_should_fail_request(struct mmc_host *host, | |
130 | struct mmc_request *mrq) | |
131 | { | |
132 | } | |
133 | ||
134 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
135 | ||
1da177e4 | 136 | /** |
fe10c6ab RK |
137 | * mmc_request_done - finish processing an MMC request |
138 | * @host: MMC host which completed request | |
139 | * @mrq: MMC request which request | |
1da177e4 LT |
140 | * |
141 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 142 | * their processing of a request. |
1da177e4 LT |
143 | */ |
144 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
145 | { | |
146 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
147 | int err = cmd->error; |
148 | ||
af517150 DB |
149 | if (err && cmd->retries && mmc_host_is_spi(host)) { |
150 | if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) | |
151 | cmd->retries = 0; | |
152 | } | |
153 | ||
d3049504 | 154 | if (err && cmd->retries && !mmc_card_removed(host->card)) { |
08a7e1df AH |
155 | /* |
156 | * Request starter must handle retries - see | |
157 | * mmc_wait_for_req_done(). | |
158 | */ | |
159 | if (mrq->done) | |
160 | mrq->done(mrq); | |
e4d21708 | 161 | } else { |
1b676f70 PF |
162 | mmc_should_fail_request(host, mrq); |
163 | ||
af8350c7 PO |
164 | led_trigger_event(host->led, LED_OFF); |
165 | ||
e4d21708 PO |
166 | pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n", |
167 | mmc_hostname(host), cmd->opcode, err, | |
168 | cmd->resp[0], cmd->resp[1], | |
169 | cmd->resp[2], cmd->resp[3]); | |
170 | ||
171 | if (mrq->data) { | |
172 | pr_debug("%s: %d bytes transferred: %d\n", | |
173 | mmc_hostname(host), | |
174 | mrq->data->bytes_xfered, mrq->data->error); | |
175 | } | |
176 | ||
177 | if (mrq->stop) { | |
178 | pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n", | |
179 | mmc_hostname(host), mrq->stop->opcode, | |
180 | mrq->stop->error, | |
181 | mrq->stop->resp[0], mrq->stop->resp[1], | |
182 | mrq->stop->resp[2], mrq->stop->resp[3]); | |
183 | } | |
184 | ||
185 | if (mrq->done) | |
186 | mrq->done(mrq); | |
04566831 | 187 | |
08c14071 | 188 | mmc_host_clk_release(host); |
1da177e4 LT |
189 | } |
190 | } | |
191 | ||
192 | EXPORT_SYMBOL(mmc_request_done); | |
193 | ||
39361851 | 194 | static void |
1da177e4 LT |
195 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) |
196 | { | |
976d9276 PO |
197 | #ifdef CONFIG_MMC_DEBUG |
198 | unsigned int i, sz; | |
a84756c5 | 199 | struct scatterlist *sg; |
976d9276 PO |
200 | #endif |
201 | ||
7b2fd4f2 JC |
202 | if (mrq->sbc) { |
203 | pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n", | |
204 | mmc_hostname(host), mrq->sbc->opcode, | |
205 | mrq->sbc->arg, mrq->sbc->flags); | |
206 | } | |
207 | ||
920e70c5 RK |
208 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
209 | mmc_hostname(host), mrq->cmd->opcode, | |
210 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 211 | |
e4d21708 PO |
212 | if (mrq->data) { |
213 | pr_debug("%s: blksz %d blocks %d flags %08x " | |
214 | "tsac %d ms nsac %d\n", | |
215 | mmc_hostname(host), mrq->data->blksz, | |
216 | mrq->data->blocks, mrq->data->flags, | |
ce252edd | 217 | mrq->data->timeout_ns / 1000000, |
e4d21708 PO |
218 | mrq->data->timeout_clks); |
219 | } | |
220 | ||
221 | if (mrq->stop) { | |
222 | pr_debug("%s: CMD%u arg %08x flags %08x\n", | |
223 | mmc_hostname(host), mrq->stop->opcode, | |
224 | mrq->stop->arg, mrq->stop->flags); | |
225 | } | |
226 | ||
f22ee4ed | 227 | WARN_ON(!host->claimed); |
1da177e4 LT |
228 | |
229 | mrq->cmd->error = 0; | |
230 | mrq->cmd->mrq = mrq; | |
231 | if (mrq->data) { | |
fe4a3c7a | 232 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
233 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
234 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
235 | host->max_req_size); | |
fe4a3c7a | 236 | |
976d9276 PO |
237 | #ifdef CONFIG_MMC_DEBUG |
238 | sz = 0; | |
a84756c5 PO |
239 | for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) |
240 | sz += sg->length; | |
976d9276 PO |
241 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); |
242 | #endif | |
243 | ||
1da177e4 LT |
244 | mrq->cmd->data = mrq->data; |
245 | mrq->data->error = 0; | |
246 | mrq->data->mrq = mrq; | |
247 | if (mrq->stop) { | |
248 | mrq->data->stop = mrq->stop; | |
249 | mrq->stop->error = 0; | |
250 | mrq->stop->mrq = mrq; | |
251 | } | |
252 | } | |
08c14071 | 253 | mmc_host_clk_hold(host); |
66c036e0 | 254 | led_trigger_event(host->led, LED_FULL); |
1da177e4 LT |
255 | host->ops->request(host, mrq); |
256 | } | |
257 | ||
950d56ac JC |
258 | /** |
259 | * mmc_start_bkops - start BKOPS for supported cards | |
260 | * @card: MMC card to start BKOPS | |
261 | * @form_exception: A flag to indicate if this function was | |
262 | * called due to an exception raised by the card | |
263 | * | |
264 | * Start background operations whenever requested. | |
265 | * When the urgent BKOPS bit is set in a R1 command response | |
266 | * then background operations should be started immediately. | |
267 | */ | |
268 | void mmc_start_bkops(struct mmc_card *card, bool from_exception) | |
269 | { | |
270 | int err; | |
271 | int timeout; | |
272 | bool use_busy_signal; | |
273 | ||
274 | BUG_ON(!card); | |
275 | ||
276 | if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card)) | |
277 | return; | |
278 | ||
279 | err = mmc_read_bkops_status(card); | |
280 | if (err) { | |
281 | pr_err("%s: Failed to read bkops status: %d\n", | |
282 | mmc_hostname(card->host), err); | |
283 | return; | |
284 | } | |
285 | ||
286 | if (!card->ext_csd.raw_bkops_status) | |
287 | return; | |
288 | ||
289 | if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 && | |
290 | from_exception) | |
291 | return; | |
292 | ||
293 | mmc_claim_host(card->host); | |
294 | if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) { | |
295 | timeout = MMC_BKOPS_MAX_TIMEOUT; | |
296 | use_busy_signal = true; | |
297 | } else { | |
298 | timeout = 0; | |
299 | use_busy_signal = false; | |
300 | } | |
301 | ||
302 | err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
303 | EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal); | |
304 | if (err) { | |
305 | pr_warn("%s: Error %d starting bkops\n", | |
306 | mmc_hostname(card->host), err); | |
307 | goto out; | |
308 | } | |
309 | ||
310 | /* | |
311 | * For urgent bkops status (LEVEL_2 and more) | |
312 | * bkops executed synchronously, otherwise | |
313 | * the operation is in progress | |
314 | */ | |
315 | if (!use_busy_signal) | |
316 | mmc_card_set_doing_bkops(card); | |
317 | out: | |
318 | mmc_release_host(card->host); | |
319 | } | |
320 | EXPORT_SYMBOL(mmc_start_bkops); | |
321 | ||
2220eedf KD |
322 | /* |
323 | * mmc_wait_data_done() - done callback for data request | |
324 | * @mrq: done data request | |
325 | * | |
326 | * Wakes up mmc context, passed as a callback to host controller driver | |
327 | */ | |
328 | static void mmc_wait_data_done(struct mmc_request *mrq) | |
329 | { | |
330 | mrq->host->context_info.is_done_rcv = true; | |
331 | wake_up_interruptible(&mrq->host->context_info.wait); | |
332 | } | |
333 | ||
1da177e4 LT |
334 | static void mmc_wait_done(struct mmc_request *mrq) |
335 | { | |
aa8b683a PF |
336 | complete(&mrq->completion); |
337 | } | |
338 | ||
2220eedf KD |
339 | /* |
340 | *__mmc_start_data_req() - starts data request | |
341 | * @host: MMC host to start the request | |
342 | * @mrq: data request to start | |
343 | * | |
344 | * Sets the done callback to be called when request is completed by the card. | |
345 | * Starts data mmc request execution | |
346 | */ | |
347 | static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq) | |
348 | { | |
349 | mrq->done = mmc_wait_data_done; | |
350 | mrq->host = host; | |
351 | if (mmc_card_removed(host->card)) { | |
352 | mrq->cmd->error = -ENOMEDIUM; | |
9b844961 | 353 | mmc_wait_data_done(mrq); |
2220eedf KD |
354 | return -ENOMEDIUM; |
355 | } | |
356 | mmc_start_request(host, mrq); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
956d9fd5 | 361 | static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) |
aa8b683a PF |
362 | { |
363 | init_completion(&mrq->completion); | |
364 | mrq->done = mmc_wait_done; | |
d3049504 AH |
365 | if (mmc_card_removed(host->card)) { |
366 | mrq->cmd->error = -ENOMEDIUM; | |
367 | complete(&mrq->completion); | |
956d9fd5 | 368 | return -ENOMEDIUM; |
d3049504 | 369 | } |
aa8b683a | 370 | mmc_start_request(host, mrq); |
956d9fd5 | 371 | return 0; |
aa8b683a PF |
372 | } |
373 | ||
2220eedf KD |
374 | /* |
375 | * mmc_wait_for_data_req_done() - wait for request completed | |
376 | * @host: MMC host to prepare the command. | |
377 | * @mrq: MMC request to wait for | |
378 | * | |
379 | * Blocks MMC context till host controller will ack end of data request | |
380 | * execution or new request notification arrives from the block layer. | |
381 | * Handles command retries. | |
382 | * | |
383 | * Returns enum mmc_blk_status after checking errors. | |
384 | */ | |
385 | static int mmc_wait_for_data_req_done(struct mmc_host *host, | |
386 | struct mmc_request *mrq, | |
387 | struct mmc_async_req *next_req) | |
388 | { | |
389 | struct mmc_command *cmd; | |
390 | struct mmc_context_info *context_info = &host->context_info; | |
391 | int err; | |
392 | unsigned long flags; | |
393 | ||
394 | while (1) { | |
395 | wait_event_interruptible(context_info->wait, | |
396 | (context_info->is_done_rcv || | |
397 | context_info->is_new_req)); | |
398 | spin_lock_irqsave(&context_info->lock, flags); | |
399 | context_info->is_waiting_last_req = false; | |
400 | spin_unlock_irqrestore(&context_info->lock, flags); | |
401 | if (context_info->is_done_rcv) { | |
402 | context_info->is_done_rcv = false; | |
403 | context_info->is_new_req = false; | |
404 | cmd = mrq->cmd; | |
775a9362 | 405 | |
2220eedf KD |
406 | if (!cmd->error || !cmd->retries || |
407 | mmc_card_removed(host->card)) { | |
408 | err = host->areq->err_check(host->card, | |
409 | host->areq); | |
410 | break; /* return err */ | |
411 | } else { | |
412 | pr_info("%s: req failed (CMD%u): %d, retrying...\n", | |
413 | mmc_hostname(host), | |
414 | cmd->opcode, cmd->error); | |
415 | cmd->retries--; | |
416 | cmd->error = 0; | |
417 | host->ops->request(host, mrq); | |
418 | continue; /* wait for done/new event again */ | |
419 | } | |
420 | } else if (context_info->is_new_req) { | |
421 | context_info->is_new_req = false; | |
422 | if (!next_req) { | |
423 | err = MMC_BLK_NEW_REQUEST; | |
424 | break; /* return err */ | |
425 | } | |
426 | } | |
427 | } | |
428 | return err; | |
429 | } | |
430 | ||
aa8b683a PF |
431 | static void mmc_wait_for_req_done(struct mmc_host *host, |
432 | struct mmc_request *mrq) | |
433 | { | |
08a7e1df AH |
434 | struct mmc_command *cmd; |
435 | ||
436 | while (1) { | |
437 | wait_for_completion(&mrq->completion); | |
438 | ||
439 | cmd = mrq->cmd; | |
775a9362 ME |
440 | |
441 | /* | |
442 | * If host has timed out waiting for the sanitize | |
443 | * to complete, card might be still in programming state | |
444 | * so let's try to bring the card out of programming | |
445 | * state. | |
446 | */ | |
447 | if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) { | |
448 | if (!mmc_interrupt_hpi(host->card)) { | |
449 | pr_warning("%s: %s: Interrupted sanitize\n", | |
450 | mmc_hostname(host), __func__); | |
451 | cmd->error = 0; | |
452 | break; | |
453 | } else { | |
454 | pr_err("%s: %s: Failed to interrupt sanitize\n", | |
455 | mmc_hostname(host), __func__); | |
456 | } | |
457 | } | |
d3049504 AH |
458 | if (!cmd->error || !cmd->retries || |
459 | mmc_card_removed(host->card)) | |
08a7e1df AH |
460 | break; |
461 | ||
462 | pr_debug("%s: req failed (CMD%u): %d, retrying...\n", | |
463 | mmc_hostname(host), cmd->opcode, cmd->error); | |
464 | cmd->retries--; | |
465 | cmd->error = 0; | |
466 | host->ops->request(host, mrq); | |
467 | } | |
aa8b683a PF |
468 | } |
469 | ||
470 | /** | |
471 | * mmc_pre_req - Prepare for a new request | |
472 | * @host: MMC host to prepare command | |
473 | * @mrq: MMC request to prepare for | |
474 | * @is_first_req: true if there is no previous started request | |
475 | * that may run in parellel to this call, otherwise false | |
476 | * | |
477 | * mmc_pre_req() is called in prior to mmc_start_req() to let | |
478 | * host prepare for the new request. Preparation of a request may be | |
479 | * performed while another request is running on the host. | |
480 | */ | |
481 | static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq, | |
482 | bool is_first_req) | |
483 | { | |
2c4967f7 SRT |
484 | if (host->ops->pre_req) { |
485 | mmc_host_clk_hold(host); | |
aa8b683a | 486 | host->ops->pre_req(host, mrq, is_first_req); |
2c4967f7 SRT |
487 | mmc_host_clk_release(host); |
488 | } | |
aa8b683a PF |
489 | } |
490 | ||
491 | /** | |
492 | * mmc_post_req - Post process a completed request | |
493 | * @host: MMC host to post process command | |
494 | * @mrq: MMC request to post process for | |
495 | * @err: Error, if non zero, clean up any resources made in pre_req | |
496 | * | |
497 | * Let the host post process a completed request. Post processing of | |
498 | * a request may be performed while another reuqest is running. | |
499 | */ | |
500 | static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq, | |
501 | int err) | |
502 | { | |
2c4967f7 SRT |
503 | if (host->ops->post_req) { |
504 | mmc_host_clk_hold(host); | |
aa8b683a | 505 | host->ops->post_req(host, mrq, err); |
2c4967f7 SRT |
506 | mmc_host_clk_release(host); |
507 | } | |
1da177e4 LT |
508 | } |
509 | ||
aa8b683a PF |
510 | /** |
511 | * mmc_start_req - start a non-blocking request | |
512 | * @host: MMC host to start command | |
513 | * @areq: async request to start | |
514 | * @error: out parameter returns 0 for success, otherwise non zero | |
515 | * | |
516 | * Start a new MMC custom command request for a host. | |
517 | * If there is on ongoing async request wait for completion | |
518 | * of that request and start the new one and return. | |
519 | * Does not wait for the new request to complete. | |
520 | * | |
521 | * Returns the completed request, NULL in case of none completed. | |
522 | * Wait for the an ongoing request (previoulsy started) to complete and | |
523 | * return the completed request. If there is no ongoing request, NULL | |
524 | * is returned without waiting. NULL is not an error condition. | |
525 | */ | |
526 | struct mmc_async_req *mmc_start_req(struct mmc_host *host, | |
527 | struct mmc_async_req *areq, int *error) | |
528 | { | |
529 | int err = 0; | |
956d9fd5 | 530 | int start_err = 0; |
aa8b683a PF |
531 | struct mmc_async_req *data = host->areq; |
532 | ||
533 | /* Prepare a new request */ | |
534 | if (areq) | |
535 | mmc_pre_req(host, areq->mrq, !host->areq); | |
536 | ||
537 | if (host->areq) { | |
f5c2758f JC |
538 | err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq); |
539 | if (err == MMC_BLK_NEW_REQUEST) { | |
540 | if (error) | |
541 | *error = err; | |
542 | /* | |
543 | * The previous request was not completed, | |
544 | * nothing to return | |
545 | */ | |
546 | return NULL; | |
547 | } | |
950d56ac JC |
548 | /* |
549 | * Check BKOPS urgency for each R1 response | |
550 | */ | |
551 | if (host->card && mmc_card_mmc(host->card) && | |
552 | ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) || | |
553 | (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) && | |
554 | (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) | |
555 | mmc_start_bkops(host->card, true); | |
aa8b683a PF |
556 | } |
557 | ||
956d9fd5 | 558 | if (!err && areq) |
2220eedf | 559 | start_err = __mmc_start_data_req(host, areq->mrq); |
aa8b683a PF |
560 | |
561 | if (host->areq) | |
562 | mmc_post_req(host, host->areq->mrq, 0); | |
563 | ||
956d9fd5 UH |
564 | /* Cancel a prepared request if it was not started. */ |
565 | if ((err || start_err) && areq) | |
f5c2758f | 566 | mmc_post_req(host, areq->mrq, -EINVAL); |
956d9fd5 UH |
567 | |
568 | if (err) | |
569 | host->areq = NULL; | |
570 | else | |
571 | host->areq = areq; | |
572 | ||
aa8b683a PF |
573 | if (error) |
574 | *error = err; | |
575 | return data; | |
576 | } | |
577 | EXPORT_SYMBOL(mmc_start_req); | |
578 | ||
67a61c48 PO |
579 | /** |
580 | * mmc_wait_for_req - start a request and wait for completion | |
581 | * @host: MMC host to start command | |
582 | * @mrq: MMC request to start | |
583 | * | |
584 | * Start a new MMC custom command request for a host, and wait | |
585 | * for the command to complete. Does not attempt to parse the | |
586 | * response. | |
587 | */ | |
588 | void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
1da177e4 | 589 | { |
aa8b683a PF |
590 | __mmc_start_req(host, mrq); |
591 | mmc_wait_for_req_done(host, mrq); | |
1da177e4 | 592 | } |
1da177e4 LT |
593 | EXPORT_SYMBOL(mmc_wait_for_req); |
594 | ||
eb0d8f13 JC |
595 | /** |
596 | * mmc_interrupt_hpi - Issue for High priority Interrupt | |
597 | * @card: the MMC card associated with the HPI transfer | |
598 | * | |
599 | * Issued High Priority Interrupt, and check for card status | |
950d56ac | 600 | * until out-of prg-state. |
eb0d8f13 JC |
601 | */ |
602 | int mmc_interrupt_hpi(struct mmc_card *card) | |
603 | { | |
604 | int err; | |
605 | u32 status; | |
6af9e96e | 606 | unsigned long prg_wait; |
eb0d8f13 JC |
607 | |
608 | BUG_ON(!card); | |
609 | ||
610 | if (!card->ext_csd.hpi_en) { | |
611 | pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host)); | |
612 | return 1; | |
613 | } | |
614 | ||
615 | mmc_claim_host(card->host); | |
616 | err = mmc_send_status(card, &status); | |
617 | if (err) { | |
618 | pr_err("%s: Get card status fail\n", mmc_hostname(card->host)); | |
619 | goto out; | |
620 | } | |
621 | ||
6af9e96e V |
622 | switch (R1_CURRENT_STATE(status)) { |
623 | case R1_STATE_IDLE: | |
624 | case R1_STATE_READY: | |
625 | case R1_STATE_STBY: | |
211d4fe5 | 626 | case R1_STATE_TRAN: |
6af9e96e | 627 | /* |
211d4fe5 | 628 | * In idle and transfer states, HPI is not needed and the caller |
6af9e96e V |
629 | * can issue the next intended command immediately |
630 | */ | |
631 | goto out; | |
632 | case R1_STATE_PRG: | |
633 | break; | |
634 | default: | |
635 | /* In all other states, it's illegal to issue HPI */ | |
636 | pr_debug("%s: HPI cannot be sent. Card state=%d\n", | |
637 | mmc_hostname(card->host), R1_CURRENT_STATE(status)); | |
638 | err = -EINVAL; | |
639 | goto out; | |
640 | } | |
641 | ||
642 | err = mmc_send_hpi_cmd(card, &status); | |
643 | if (err) | |
644 | goto out; | |
645 | ||
646 | prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time); | |
647 | do { | |
648 | err = mmc_send_status(card, &status); | |
649 | ||
650 | if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN) | |
651 | break; | |
652 | if (time_after(jiffies, prg_wait)) | |
653 | err = -ETIMEDOUT; | |
654 | } while (!err); | |
eb0d8f13 JC |
655 | |
656 | out: | |
657 | mmc_release_host(card->host); | |
658 | return err; | |
659 | } | |
660 | EXPORT_SYMBOL(mmc_interrupt_hpi); | |
661 | ||
1da177e4 LT |
662 | /** |
663 | * mmc_wait_for_cmd - start a command and wait for completion | |
664 | * @host: MMC host to start command | |
665 | * @cmd: MMC command to start | |
666 | * @retries: maximum number of retries | |
667 | * | |
668 | * Start a new MMC command for a host, and wait for the command | |
669 | * to complete. Return any error that occurred while the command | |
670 | * was executing. Do not attempt to parse the response. | |
671 | */ | |
672 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
673 | { | |
ad5fd972 | 674 | struct mmc_request mrq = {NULL}; |
1da177e4 | 675 | |
d84075c8 | 676 | WARN_ON(!host->claimed); |
1da177e4 | 677 | |
1da177e4 LT |
678 | memset(cmd->resp, 0, sizeof(cmd->resp)); |
679 | cmd->retries = retries; | |
680 | ||
681 | mrq.cmd = cmd; | |
682 | cmd->data = NULL; | |
683 | ||
684 | mmc_wait_for_req(host, &mrq); | |
685 | ||
686 | return cmd->error; | |
687 | } | |
688 | ||
689 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
690 | ||
950d56ac JC |
691 | /** |
692 | * mmc_stop_bkops - stop ongoing BKOPS | |
693 | * @card: MMC card to check BKOPS | |
694 | * | |
695 | * Send HPI command to stop ongoing background operations to | |
696 | * allow rapid servicing of foreground operations, e.g. read/ | |
697 | * writes. Wait until the card comes out of the programming state | |
698 | * to avoid errors in servicing read/write requests. | |
699 | */ | |
700 | int mmc_stop_bkops(struct mmc_card *card) | |
701 | { | |
702 | int err = 0; | |
703 | ||
704 | BUG_ON(!card); | |
705 | err = mmc_interrupt_hpi(card); | |
706 | ||
707 | /* | |
708 | * If err is EINVAL, we can't issue an HPI. | |
709 | * It should complete the BKOPS. | |
710 | */ | |
711 | if (!err || (err == -EINVAL)) { | |
712 | mmc_card_clr_doing_bkops(card); | |
713 | err = 0; | |
714 | } | |
715 | ||
716 | return err; | |
717 | } | |
718 | EXPORT_SYMBOL(mmc_stop_bkops); | |
719 | ||
720 | int mmc_read_bkops_status(struct mmc_card *card) | |
721 | { | |
722 | int err; | |
723 | u8 *ext_csd; | |
724 | ||
725 | /* | |
726 | * In future work, we should consider storing the entire ext_csd. | |
727 | */ | |
728 | ext_csd = kmalloc(512, GFP_KERNEL); | |
729 | if (!ext_csd) { | |
730 | pr_err("%s: could not allocate buffer to receive the ext_csd.\n", | |
731 | mmc_hostname(card->host)); | |
732 | return -ENOMEM; | |
733 | } | |
734 | ||
735 | mmc_claim_host(card->host); | |
736 | err = mmc_send_ext_csd(card, ext_csd); | |
737 | mmc_release_host(card->host); | |
738 | if (err) | |
739 | goto out; | |
740 | ||
741 | card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; | |
742 | card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS]; | |
743 | out: | |
744 | kfree(ext_csd); | |
745 | return err; | |
746 | } | |
747 | EXPORT_SYMBOL(mmc_read_bkops_status); | |
748 | ||
d773d725 RK |
749 | /** |
750 | * mmc_set_data_timeout - set the timeout for a data command | |
751 | * @data: data phase for command | |
752 | * @card: the MMC card associated with the data transfer | |
67a61c48 PO |
753 | * |
754 | * Computes the data timeout parameters according to the | |
755 | * correct algorithm given the card type. | |
d773d725 | 756 | */ |
b146d26a | 757 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) |
d773d725 RK |
758 | { |
759 | unsigned int mult; | |
760 | ||
e6f918bf PO |
761 | /* |
762 | * SDIO cards only define an upper 1 s limit on access. | |
763 | */ | |
764 | if (mmc_card_sdio(card)) { | |
765 | data->timeout_ns = 1000000000; | |
766 | data->timeout_clks = 0; | |
767 | return; | |
768 | } | |
769 | ||
d773d725 RK |
770 | /* |
771 | * SD cards use a 100 multiplier rather than 10 | |
772 | */ | |
773 | mult = mmc_card_sd(card) ? 100 : 10; | |
774 | ||
775 | /* | |
776 | * Scale up the multiplier (and therefore the timeout) by | |
777 | * the r2w factor for writes. | |
778 | */ | |
b146d26a | 779 | if (data->flags & MMC_DATA_WRITE) |
d773d725 RK |
780 | mult <<= card->csd.r2w_factor; |
781 | ||
782 | data->timeout_ns = card->csd.tacc_ns * mult; | |
783 | data->timeout_clks = card->csd.tacc_clks * mult; | |
784 | ||
785 | /* | |
786 | * SD cards also have an upper limit on the timeout. | |
787 | */ | |
788 | if (mmc_card_sd(card)) { | |
789 | unsigned int timeout_us, limit_us; | |
790 | ||
791 | timeout_us = data->timeout_ns / 1000; | |
e9b86841 LW |
792 | if (mmc_host_clk_rate(card->host)) |
793 | timeout_us += data->timeout_clks * 1000 / | |
794 | (mmc_host_clk_rate(card->host) / 1000); | |
d773d725 | 795 | |
b146d26a | 796 | if (data->flags & MMC_DATA_WRITE) |
493890e7 | 797 | /* |
3bdc9ba8 PW |
798 | * The MMC spec "It is strongly recommended |
799 | * for hosts to implement more than 500ms | |
800 | * timeout value even if the card indicates | |
801 | * the 250ms maximum busy length." Even the | |
802 | * previous value of 300ms is known to be | |
803 | * insufficient for some cards. | |
493890e7 | 804 | */ |
3bdc9ba8 | 805 | limit_us = 3000000; |
d773d725 RK |
806 | else |
807 | limit_us = 100000; | |
808 | ||
fba68bd2 PL |
809 | /* |
810 | * SDHC cards always use these fixed values. | |
811 | */ | |
812 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
813 | data->timeout_ns = limit_us * 1000; |
814 | data->timeout_clks = 0; | |
815 | } | |
816 | } | |
6de5fc9c SNX |
817 | |
818 | /* | |
819 | * Some cards require longer data read timeout than indicated in CSD. | |
820 | * Address this by setting the read timeout to a "reasonably high" | |
821 | * value. For the cards tested, 300ms has proven enough. If necessary, | |
822 | * this value can be increased if other problematic cards require this. | |
823 | */ | |
824 | if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) { | |
825 | data->timeout_ns = 300000000; | |
826 | data->timeout_clks = 0; | |
827 | } | |
828 | ||
c0c88871 WM |
829 | /* |
830 | * Some cards need very high timeouts if driven in SPI mode. | |
831 | * The worst observed timeout was 900ms after writing a | |
832 | * continuous stream of data until the internal logic | |
833 | * overflowed. | |
834 | */ | |
835 | if (mmc_host_is_spi(card->host)) { | |
836 | if (data->flags & MMC_DATA_WRITE) { | |
837 | if (data->timeout_ns < 1000000000) | |
838 | data->timeout_ns = 1000000000; /* 1s */ | |
839 | } else { | |
840 | if (data->timeout_ns < 100000000) | |
841 | data->timeout_ns = 100000000; /* 100ms */ | |
842 | } | |
843 | } | |
d773d725 RK |
844 | } |
845 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
846 | ||
ad3868b2 PO |
847 | /** |
848 | * mmc_align_data_size - pads a transfer size to a more optimal value | |
849 | * @card: the MMC card associated with the data transfer | |
850 | * @sz: original transfer size | |
851 | * | |
852 | * Pads the original data size with a number of extra bytes in | |
853 | * order to avoid controller bugs and/or performance hits | |
854 | * (e.g. some controllers revert to PIO for certain sizes). | |
855 | * | |
856 | * Returns the improved size, which might be unmodified. | |
857 | * | |
858 | * Note that this function is only relevant when issuing a | |
859 | * single scatter gather entry. | |
860 | */ | |
861 | unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz) | |
862 | { | |
863 | /* | |
864 | * FIXME: We don't have a system for the controller to tell | |
865 | * the core about its problems yet, so for now we just 32-bit | |
866 | * align the size. | |
867 | */ | |
868 | sz = ((sz + 3) / 4) * 4; | |
869 | ||
870 | return sz; | |
871 | } | |
872 | EXPORT_SYMBOL(mmc_align_data_size); | |
873 | ||
1da177e4 | 874 | /** |
2342f332 | 875 | * __mmc_claim_host - exclusively claim a host |
1da177e4 | 876 | * @host: mmc host to claim |
2342f332 | 877 | * @abort: whether or not the operation should be aborted |
1da177e4 | 878 | * |
2342f332 NP |
879 | * Claim a host for a set of operations. If @abort is non null and |
880 | * dereference a non-zero value then this will return prematurely with | |
881 | * that non-zero value without acquiring the lock. Returns zero | |
882 | * with the lock held otherwise. | |
1da177e4 | 883 | */ |
2342f332 | 884 | int __mmc_claim_host(struct mmc_host *host, atomic_t *abort) |
1da177e4 LT |
885 | { |
886 | DECLARE_WAITQUEUE(wait, current); | |
887 | unsigned long flags; | |
2342f332 | 888 | int stop; |
1da177e4 | 889 | |
cf795bfb PO |
890 | might_sleep(); |
891 | ||
1da177e4 LT |
892 | add_wait_queue(&host->wq, &wait); |
893 | spin_lock_irqsave(&host->lock, flags); | |
894 | while (1) { | |
895 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2342f332 | 896 | stop = abort ? atomic_read(abort) : 0; |
319a3f14 | 897 | if (stop || !host->claimed || host->claimer == current) |
1da177e4 LT |
898 | break; |
899 | spin_unlock_irqrestore(&host->lock, flags); | |
900 | schedule(); | |
901 | spin_lock_irqsave(&host->lock, flags); | |
902 | } | |
903 | set_current_state(TASK_RUNNING); | |
319a3f14 | 904 | if (!stop) { |
2342f332 | 905 | host->claimed = 1; |
319a3f14 AH |
906 | host->claimer = current; |
907 | host->claim_cnt += 1; | |
908 | } else | |
2342f332 | 909 | wake_up(&host->wq); |
1da177e4 LT |
910 | spin_unlock_irqrestore(&host->lock, flags); |
911 | remove_wait_queue(&host->wq, &wait); | |
907d2e7c AH |
912 | if (host->ops->enable && !stop && host->claim_cnt == 1) |
913 | host->ops->enable(host); | |
2342f332 | 914 | return stop; |
1da177e4 LT |
915 | } |
916 | ||
2342f332 | 917 | EXPORT_SYMBOL(__mmc_claim_host); |
1da177e4 | 918 | |
319a3f14 AH |
919 | /** |
920 | * mmc_try_claim_host - try exclusively to claim a host | |
921 | * @host: mmc host to claim | |
922 | * | |
923 | * Returns %1 if the host is claimed, %0 otherwise. | |
924 | */ | |
925 | int mmc_try_claim_host(struct mmc_host *host) | |
8ea926b2 AH |
926 | { |
927 | int claimed_host = 0; | |
928 | unsigned long flags; | |
929 | ||
930 | spin_lock_irqsave(&host->lock, flags); | |
319a3f14 | 931 | if (!host->claimed || host->claimer == current) { |
8ea926b2 | 932 | host->claimed = 1; |
319a3f14 AH |
933 | host->claimer = current; |
934 | host->claim_cnt += 1; | |
8ea926b2 AH |
935 | claimed_host = 1; |
936 | } | |
937 | spin_unlock_irqrestore(&host->lock, flags); | |
907d2e7c AH |
938 | if (host->ops->enable && claimed_host && host->claim_cnt == 1) |
939 | host->ops->enable(host); | |
8ea926b2 AH |
940 | return claimed_host; |
941 | } | |
319a3f14 | 942 | EXPORT_SYMBOL(mmc_try_claim_host); |
8ea926b2 | 943 | |
ab1efd27 | 944 | /** |
907d2e7c | 945 | * mmc_release_host - release a host |
ab1efd27 UH |
946 | * @host: mmc host to release |
947 | * | |
907d2e7c AH |
948 | * Release a MMC host, allowing others to claim the host |
949 | * for their operations. | |
ab1efd27 | 950 | */ |
907d2e7c | 951 | void mmc_release_host(struct mmc_host *host) |
8ea926b2 AH |
952 | { |
953 | unsigned long flags; | |
954 | ||
907d2e7c AH |
955 | WARN_ON(!host->claimed); |
956 | ||
957 | if (host->ops->disable && host->claim_cnt == 1) | |
958 | host->ops->disable(host); | |
959 | ||
8ea926b2 | 960 | spin_lock_irqsave(&host->lock, flags); |
319a3f14 AH |
961 | if (--host->claim_cnt) { |
962 | /* Release for nested claim */ | |
963 | spin_unlock_irqrestore(&host->lock, flags); | |
964 | } else { | |
965 | host->claimed = 0; | |
966 | host->claimer = NULL; | |
967 | spin_unlock_irqrestore(&host->lock, flags); | |
968 | wake_up(&host->wq); | |
969 | } | |
8ea926b2 | 970 | } |
1da177e4 LT |
971 | EXPORT_SYMBOL(mmc_release_host); |
972 | ||
e94cfef6 UH |
973 | /* |
974 | * This is a helper function, which fetches a runtime pm reference for the | |
975 | * card device and also claims the host. | |
976 | */ | |
977 | void mmc_get_card(struct mmc_card *card) | |
978 | { | |
979 | pm_runtime_get_sync(&card->dev); | |
980 | mmc_claim_host(card->host); | |
981 | } | |
982 | EXPORT_SYMBOL(mmc_get_card); | |
983 | ||
984 | /* | |
985 | * This is a helper function, which releases the host and drops the runtime | |
986 | * pm reference for the card device. | |
987 | */ | |
988 | void mmc_put_card(struct mmc_card *card) | |
989 | { | |
990 | mmc_release_host(card->host); | |
991 | pm_runtime_mark_last_busy(&card->dev); | |
992 | pm_runtime_put_autosuspend(&card->dev); | |
993 | } | |
994 | EXPORT_SYMBOL(mmc_put_card); | |
995 | ||
7ea239d9 PO |
996 | /* |
997 | * Internal function that does the actual ios call to the host driver, | |
998 | * optionally printing some debug output. | |
999 | */ | |
920e70c5 RK |
1000 | static inline void mmc_set_ios(struct mmc_host *host) |
1001 | { | |
1002 | struct mmc_ios *ios = &host->ios; | |
1003 | ||
cd9277c0 PO |
1004 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
1005 | "width %u timing %u\n", | |
920e70c5 RK |
1006 | mmc_hostname(host), ios->clock, ios->bus_mode, |
1007 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 1008 | ios->bus_width, ios->timing); |
fba68bd2 | 1009 | |
04566831 LW |
1010 | if (ios->clock > 0) |
1011 | mmc_set_ungated(host); | |
920e70c5 RK |
1012 | host->ops->set_ios(host, ios); |
1013 | } | |
1014 | ||
7ea239d9 PO |
1015 | /* |
1016 | * Control chip select pin on a host. | |
1017 | */ | |
da7fbe58 | 1018 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 1019 | { |
778e277c | 1020 | mmc_host_clk_hold(host); |
da7fbe58 PO |
1021 | host->ios.chip_select = mode; |
1022 | mmc_set_ios(host); | |
778e277c | 1023 | mmc_host_clk_release(host); |
1da177e4 LT |
1024 | } |
1025 | ||
7ea239d9 PO |
1026 | /* |
1027 | * Sets the host clock to the highest possible frequency that | |
1028 | * is below "hz". | |
1029 | */ | |
778e277c | 1030 | static void __mmc_set_clock(struct mmc_host *host, unsigned int hz) |
7ea239d9 PO |
1031 | { |
1032 | WARN_ON(hz < host->f_min); | |
1033 | ||
1034 | if (hz > host->f_max) | |
1035 | hz = host->f_max; | |
1036 | ||
1037 | host->ios.clock = hz; | |
1038 | mmc_set_ios(host); | |
1039 | } | |
1040 | ||
778e277c MW |
1041 | void mmc_set_clock(struct mmc_host *host, unsigned int hz) |
1042 | { | |
1043 | mmc_host_clk_hold(host); | |
1044 | __mmc_set_clock(host, hz); | |
1045 | mmc_host_clk_release(host); | |
1046 | } | |
1047 | ||
04566831 LW |
1048 | #ifdef CONFIG_MMC_CLKGATE |
1049 | /* | |
1050 | * This gates the clock by setting it to 0 Hz. | |
1051 | */ | |
1052 | void mmc_gate_clock(struct mmc_host *host) | |
1053 | { | |
1054 | unsigned long flags; | |
1055 | ||
1056 | spin_lock_irqsave(&host->clk_lock, flags); | |
1057 | host->clk_old = host->ios.clock; | |
1058 | host->ios.clock = 0; | |
1059 | host->clk_gated = true; | |
1060 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
1061 | mmc_set_ios(host); | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * This restores the clock from gating by using the cached | |
1066 | * clock value. | |
1067 | */ | |
1068 | void mmc_ungate_clock(struct mmc_host *host) | |
1069 | { | |
1070 | /* | |
1071 | * We should previously have gated the clock, so the clock shall | |
1072 | * be 0 here! The clock may however be 0 during initialization, | |
1073 | * when some request operations are performed before setting | |
1074 | * the frequency. When ungate is requested in that situation | |
1075 | * we just ignore the call. | |
1076 | */ | |
1077 | if (host->clk_old) { | |
1078 | BUG_ON(host->ios.clock); | |
1079 | /* This call will also set host->clk_gated to false */ | |
778e277c | 1080 | __mmc_set_clock(host, host->clk_old); |
04566831 LW |
1081 | } |
1082 | } | |
1083 | ||
1084 | void mmc_set_ungated(struct mmc_host *host) | |
1085 | { | |
1086 | unsigned long flags; | |
1087 | ||
1088 | /* | |
1089 | * We've been given a new frequency while the clock is gated, | |
1090 | * so make sure we regard this as ungating it. | |
1091 | */ | |
1092 | spin_lock_irqsave(&host->clk_lock, flags); | |
1093 | host->clk_gated = false; | |
1094 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
1095 | } | |
1096 | ||
1097 | #else | |
1098 | void mmc_set_ungated(struct mmc_host *host) | |
1099 | { | |
1100 | } | |
1101 | #endif | |
1102 | ||
7ea239d9 PO |
1103 | /* |
1104 | * Change the bus mode (open drain/push-pull) of a host. | |
1105 | */ | |
1106 | void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) | |
1107 | { | |
778e277c | 1108 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1109 | host->ios.bus_mode = mode; |
1110 | mmc_set_ios(host); | |
778e277c | 1111 | mmc_host_clk_release(host); |
7ea239d9 PO |
1112 | } |
1113 | ||
0f8d8ea6 AH |
1114 | /* |
1115 | * Change data bus width of a host. | |
1116 | */ | |
1117 | void mmc_set_bus_width(struct mmc_host *host, unsigned int width) | |
1118 | { | |
778e277c | 1119 | mmc_host_clk_hold(host); |
4c4cb171 PR |
1120 | host->ios.bus_width = width; |
1121 | mmc_set_ios(host); | |
778e277c | 1122 | mmc_host_clk_release(host); |
0f8d8ea6 AH |
1123 | } |
1124 | ||
86e8286a AV |
1125 | /** |
1126 | * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number | |
1127 | * @vdd: voltage (mV) | |
1128 | * @low_bits: prefer low bits in boundary cases | |
1129 | * | |
1130 | * This function returns the OCR bit number according to the provided @vdd | |
1131 | * value. If conversion is not possible a negative errno value returned. | |
1132 | * | |
1133 | * Depending on the @low_bits flag the function prefers low or high OCR bits | |
1134 | * on boundary voltages. For example, | |
1135 | * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33); | |
1136 | * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34); | |
1137 | * | |
1138 | * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21). | |
1139 | */ | |
1140 | static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits) | |
1141 | { | |
1142 | const int max_bit = ilog2(MMC_VDD_35_36); | |
1143 | int bit; | |
1144 | ||
1145 | if (vdd < 1650 || vdd > 3600) | |
1146 | return -EINVAL; | |
1147 | ||
1148 | if (vdd >= 1650 && vdd <= 1950) | |
1149 | return ilog2(MMC_VDD_165_195); | |
1150 | ||
1151 | if (low_bits) | |
1152 | vdd -= 1; | |
1153 | ||
1154 | /* Base 2000 mV, step 100 mV, bit's base 8. */ | |
1155 | bit = (vdd - 2000) / 100 + 8; | |
1156 | if (bit > max_bit) | |
1157 | return max_bit; | |
1158 | return bit; | |
1159 | } | |
1160 | ||
1161 | /** | |
1162 | * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask | |
1163 | * @vdd_min: minimum voltage value (mV) | |
1164 | * @vdd_max: maximum voltage value (mV) | |
1165 | * | |
1166 | * This function returns the OCR mask bits according to the provided @vdd_min | |
1167 | * and @vdd_max values. If conversion is not possible the function returns 0. | |
1168 | * | |
1169 | * Notes wrt boundary cases: | |
1170 | * This function sets the OCR bits for all boundary voltages, for example | |
1171 | * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 | | |
1172 | * MMC_VDD_34_35 mask. | |
1173 | */ | |
1174 | u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) | |
1175 | { | |
1176 | u32 mask = 0; | |
1177 | ||
1178 | if (vdd_max < vdd_min) | |
1179 | return 0; | |
1180 | ||
1181 | /* Prefer high bits for the boundary vdd_max values. */ | |
1182 | vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false); | |
1183 | if (vdd_max < 0) | |
1184 | return 0; | |
1185 | ||
1186 | /* Prefer low bits for the boundary vdd_min values. */ | |
1187 | vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true); | |
1188 | if (vdd_min < 0) | |
1189 | return 0; | |
1190 | ||
1191 | /* Fill the mask, from max bit to min bit. */ | |
1192 | while (vdd_max >= vdd_min) | |
1193 | mask |= 1 << vdd_max--; | |
1194 | ||
1195 | return mask; | |
1196 | } | |
1197 | EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); | |
1198 | ||
5c13941a DB |
1199 | #ifdef CONFIG_REGULATOR |
1200 | ||
1201 | /** | |
1202 | * mmc_regulator_get_ocrmask - return mask of supported voltages | |
1203 | * @supply: regulator to use | |
1204 | * | |
1205 | * This returns either a negative errno, or a mask of voltages that | |
1206 | * can be provided to MMC/SD/SDIO devices using the specified voltage | |
1207 | * regulator. This would normally be called before registering the | |
1208 | * MMC host adapter. | |
1209 | */ | |
1210 | int mmc_regulator_get_ocrmask(struct regulator *supply) | |
1211 | { | |
1212 | int result = 0; | |
1213 | int count; | |
1214 | int i; | |
1215 | ||
1216 | count = regulator_count_voltages(supply); | |
1217 | if (count < 0) | |
1218 | return count; | |
1219 | ||
1220 | for (i = 0; i < count; i++) { | |
1221 | int vdd_uV; | |
1222 | int vdd_mV; | |
1223 | ||
1224 | vdd_uV = regulator_list_voltage(supply, i); | |
1225 | if (vdd_uV <= 0) | |
1226 | continue; | |
1227 | ||
1228 | vdd_mV = vdd_uV / 1000; | |
1229 | result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); | |
1230 | } | |
1231 | ||
1232 | return result; | |
1233 | } | |
45a6b32e | 1234 | EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask); |
5c13941a DB |
1235 | |
1236 | /** | |
1237 | * mmc_regulator_set_ocr - set regulator to match host->ios voltage | |
99fc5131 | 1238 | * @mmc: the host to regulate |
5c13941a | 1239 | * @supply: regulator to use |
99fc5131 | 1240 | * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) |
5c13941a DB |
1241 | * |
1242 | * Returns zero on success, else negative errno. | |
1243 | * | |
1244 | * MMC host drivers may use this to enable or disable a regulator using | |
1245 | * a particular supply voltage. This would normally be called from the | |
1246 | * set_ios() method. | |
1247 | */ | |
99fc5131 LW |
1248 | int mmc_regulator_set_ocr(struct mmc_host *mmc, |
1249 | struct regulator *supply, | |
1250 | unsigned short vdd_bit) | |
5c13941a DB |
1251 | { |
1252 | int result = 0; | |
1253 | int min_uV, max_uV; | |
5c13941a DB |
1254 | |
1255 | if (vdd_bit) { | |
1256 | int tmp; | |
1257 | int voltage; | |
1258 | ||
9cde5b7a CB |
1259 | /* |
1260 | * REVISIT mmc_vddrange_to_ocrmask() may have set some | |
5c13941a DB |
1261 | * bits this regulator doesn't quite support ... don't |
1262 | * be too picky, most cards and regulators are OK with | |
1263 | * a 0.1V range goof (it's a small error percentage). | |
1264 | */ | |
1265 | tmp = vdd_bit - ilog2(MMC_VDD_165_195); | |
1266 | if (tmp == 0) { | |
1267 | min_uV = 1650 * 1000; | |
1268 | max_uV = 1950 * 1000; | |
1269 | } else { | |
1270 | min_uV = 1900 * 1000 + tmp * 100 * 1000; | |
1271 | max_uV = min_uV + 100 * 1000; | |
1272 | } | |
1273 | ||
9cde5b7a CB |
1274 | /* |
1275 | * If we're using a fixed/static regulator, don't call | |
1276 | * regulator_set_voltage; it would fail. | |
5c13941a DB |
1277 | */ |
1278 | voltage = regulator_get_voltage(supply); | |
6e8201f5 | 1279 | |
5f56a8e6 | 1280 | if (!regulator_can_change_voltage(supply)) |
6e8201f5 JC |
1281 | min_uV = max_uV = voltage; |
1282 | ||
5c13941a DB |
1283 | if (voltage < 0) |
1284 | result = voltage; | |
1285 | else if (voltage < min_uV || voltage > max_uV) | |
1286 | result = regulator_set_voltage(supply, min_uV, max_uV); | |
1287 | else | |
1288 | result = 0; | |
1289 | ||
99fc5131 | 1290 | if (result == 0 && !mmc->regulator_enabled) { |
5c13941a | 1291 | result = regulator_enable(supply); |
99fc5131 LW |
1292 | if (!result) |
1293 | mmc->regulator_enabled = true; | |
1294 | } | |
1295 | } else if (mmc->regulator_enabled) { | |
5c13941a | 1296 | result = regulator_disable(supply); |
99fc5131 LW |
1297 | if (result == 0) |
1298 | mmc->regulator_enabled = false; | |
5c13941a DB |
1299 | } |
1300 | ||
99fc5131 LW |
1301 | if (result) |
1302 | dev_err(mmc_dev(mmc), | |
1303 | "could not set regulator OCR (%d)\n", result); | |
5c13941a DB |
1304 | return result; |
1305 | } | |
45a6b32e | 1306 | EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr); |
5c13941a | 1307 | |
e137788d GL |
1308 | int mmc_regulator_get_supply(struct mmc_host *mmc) |
1309 | { | |
1310 | struct device *dev = mmc_dev(mmc); | |
1311 | struct regulator *supply; | |
1312 | int ret; | |
1313 | ||
1314 | supply = devm_regulator_get(dev, "vmmc"); | |
1315 | mmc->supply.vmmc = supply; | |
bc35d5ed | 1316 | mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc"); |
e137788d GL |
1317 | |
1318 | if (IS_ERR(supply)) | |
1319 | return PTR_ERR(supply); | |
1320 | ||
1321 | ret = mmc_regulator_get_ocrmask(supply); | |
1322 | if (ret > 0) | |
1323 | mmc->ocr_avail = ret; | |
1324 | else | |
1325 | dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret); | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | EXPORT_SYMBOL_GPL(mmc_regulator_get_supply); | |
1330 | ||
99fc5131 | 1331 | #endif /* CONFIG_REGULATOR */ |
5c13941a | 1332 | |
1da177e4 LT |
1333 | /* |
1334 | * Mask off any voltages we don't support and select | |
1335 | * the lowest voltage | |
1336 | */ | |
7ea239d9 | 1337 | u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) |
1da177e4 LT |
1338 | { |
1339 | int bit; | |
1340 | ||
1341 | ocr &= host->ocr_avail; | |
1342 | ||
1343 | bit = ffs(ocr); | |
1344 | if (bit) { | |
1345 | bit -= 1; | |
1346 | ||
63ef731a | 1347 | ocr &= 3 << bit; |
1da177e4 | 1348 | |
778e277c | 1349 | mmc_host_clk_hold(host); |
1da177e4 | 1350 | host->ios.vdd = bit; |
920e70c5 | 1351 | mmc_set_ios(host); |
778e277c | 1352 | mmc_host_clk_release(host); |
1da177e4 | 1353 | } else { |
f6e10b86 DB |
1354 | pr_warning("%s: host doesn't support card's voltages\n", |
1355 | mmc_hostname(host)); | |
1da177e4 LT |
1356 | ocr = 0; |
1357 | } | |
1358 | ||
1359 | return ocr; | |
1360 | } | |
1361 | ||
567c8903 JR |
1362 | int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) |
1363 | { | |
1364 | int err = 0; | |
1365 | int old_signal_voltage = host->ios.signal_voltage; | |
1366 | ||
1367 | host->ios.signal_voltage = signal_voltage; | |
1368 | if (host->ops->start_signal_voltage_switch) { | |
1369 | mmc_host_clk_hold(host); | |
1370 | err = host->ops->start_signal_voltage_switch(host, &host->ios); | |
1371 | mmc_host_clk_release(host); | |
1372 | } | |
1373 | ||
1374 | if (err) | |
1375 | host->ios.signal_voltage = old_signal_voltage; | |
1376 | ||
1377 | return err; | |
1378 | ||
1379 | } | |
1380 | ||
1381 | int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage) | |
f2119df6 AN |
1382 | { |
1383 | struct mmc_command cmd = {0}; | |
1384 | int err = 0; | |
0797e5f1 | 1385 | u32 clock; |
f2119df6 AN |
1386 | |
1387 | BUG_ON(!host); | |
1388 | ||
1389 | /* | |
1390 | * Send CMD11 only if the request is to switch the card to | |
1391 | * 1.8V signalling. | |
1392 | */ | |
0797e5f1 JR |
1393 | if (signal_voltage == MMC_SIGNAL_VOLTAGE_330) |
1394 | return __mmc_set_signal_voltage(host, signal_voltage); | |
f2119df6 | 1395 | |
0797e5f1 JR |
1396 | /* |
1397 | * If we cannot switch voltages, return failure so the caller | |
1398 | * can continue without UHS mode | |
1399 | */ | |
1400 | if (!host->ops->start_signal_voltage_switch) | |
1401 | return -EPERM; | |
1402 | if (!host->ops->card_busy) | |
1403 | pr_warning("%s: cannot verify signal voltage switch\n", | |
1404 | mmc_hostname(host)); | |
1405 | ||
1406 | cmd.opcode = SD_SWITCH_VOLTAGE; | |
1407 | cmd.arg = 0; | |
1408 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1409 | ||
1410 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1411 | if (err) | |
1412 | return err; | |
1413 | ||
1414 | if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) | |
1415 | return -EIO; | |
1416 | ||
1417 | mmc_host_clk_hold(host); | |
1418 | /* | |
1419 | * The card should drive cmd and dat[0:3] low immediately | |
1420 | * after the response of cmd11, but wait 1 ms to be sure | |
1421 | */ | |
1422 | mmc_delay(1); | |
1423 | if (host->ops->card_busy && !host->ops->card_busy(host)) { | |
1424 | err = -EAGAIN; | |
1425 | goto power_cycle; | |
1426 | } | |
1427 | /* | |
1428 | * During a signal voltage level switch, the clock must be gated | |
1429 | * for 5 ms according to the SD spec | |
1430 | */ | |
1431 | clock = host->ios.clock; | |
1432 | host->ios.clock = 0; | |
1433 | mmc_set_ios(host); | |
f2119df6 | 1434 | |
0797e5f1 JR |
1435 | if (__mmc_set_signal_voltage(host, signal_voltage)) { |
1436 | /* | |
1437 | * Voltages may not have been switched, but we've already | |
1438 | * sent CMD11, so a power cycle is required anyway | |
1439 | */ | |
1440 | err = -EAGAIN; | |
1441 | goto power_cycle; | |
f2119df6 AN |
1442 | } |
1443 | ||
0797e5f1 JR |
1444 | /* Keep clock gated for at least 5 ms */ |
1445 | mmc_delay(5); | |
1446 | host->ios.clock = clock; | |
1447 | mmc_set_ios(host); | |
1448 | ||
1449 | /* Wait for at least 1 ms according to spec */ | |
1450 | mmc_delay(1); | |
1451 | ||
1452 | /* | |
1453 | * Failure to switch is indicated by the card holding | |
1454 | * dat[0:3] low | |
1455 | */ | |
1456 | if (host->ops->card_busy && host->ops->card_busy(host)) | |
1457 | err = -EAGAIN; | |
1458 | ||
1459 | power_cycle: | |
1460 | if (err) { | |
1461 | pr_debug("%s: Signal voltage switch failed, " | |
1462 | "power cycling card\n", mmc_hostname(host)); | |
1463 | mmc_power_cycle(host); | |
1464 | } | |
1465 | ||
1466 | mmc_host_clk_release(host); | |
1467 | ||
1468 | return err; | |
f2119df6 AN |
1469 | } |
1470 | ||
b57c43ad | 1471 | /* |
7ea239d9 | 1472 | * Select timing parameters for host. |
b57c43ad | 1473 | */ |
7ea239d9 | 1474 | void mmc_set_timing(struct mmc_host *host, unsigned int timing) |
b57c43ad | 1475 | { |
778e277c | 1476 | mmc_host_clk_hold(host); |
7ea239d9 PO |
1477 | host->ios.timing = timing; |
1478 | mmc_set_ios(host); | |
778e277c | 1479 | mmc_host_clk_release(host); |
b57c43ad PO |
1480 | } |
1481 | ||
d6d50a15 AN |
1482 | /* |
1483 | * Select appropriate driver type for host. | |
1484 | */ | |
1485 | void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type) | |
1486 | { | |
778e277c | 1487 | mmc_host_clk_hold(host); |
d6d50a15 AN |
1488 | host->ios.drv_type = drv_type; |
1489 | mmc_set_ios(host); | |
778e277c | 1490 | mmc_host_clk_release(host); |
d6d50a15 AN |
1491 | } |
1492 | ||
1da177e4 | 1493 | /* |
45f8245b RK |
1494 | * Apply power to the MMC stack. This is a two-stage process. |
1495 | * First, we enable power to the card without the clock running. | |
1496 | * We then wait a bit for the power to stabilise. Finally, | |
1497 | * enable the bus drivers and clock to the card. | |
1498 | * | |
1499 | * We must _NOT_ enable the clock prior to power stablising. | |
1500 | * | |
1501 | * If a host does all the power sequencing itself, ignore the | |
1502 | * initial MMC_POWER_UP stage. | |
1da177e4 | 1503 | */ |
12d01d0b | 1504 | void mmc_power_up(struct mmc_host *host) |
1da177e4 | 1505 | { |
500f3564 BR |
1506 | int bit; |
1507 | ||
fa550189 UH |
1508 | if (host->ios.power_mode == MMC_POWER_ON) |
1509 | return; | |
1510 | ||
778e277c MW |
1511 | mmc_host_clk_hold(host); |
1512 | ||
500f3564 BR |
1513 | /* If ocr is set, we use it */ |
1514 | if (host->ocr) | |
1515 | bit = ffs(host->ocr) - 1; | |
1516 | else | |
1517 | bit = fls(host->ocr_avail) - 1; | |
1da177e4 LT |
1518 | |
1519 | host->ios.vdd = bit; | |
44669034 | 1520 | if (mmc_host_is_spi(host)) |
af517150 | 1521 | host->ios.chip_select = MMC_CS_HIGH; |
44669034 | 1522 | else |
af517150 | 1523 | host->ios.chip_select = MMC_CS_DONTCARE; |
44669034 | 1524 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; |
1da177e4 | 1525 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 1526 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1527 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1528 | mmc_set_ios(host); |
1da177e4 | 1529 | |
108ecc4c | 1530 | /* Set signal voltage to 3.3V */ |
567c8903 | 1531 | __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330); |
108ecc4c | 1532 | |
f9996aee PO |
1533 | /* |
1534 | * This delay should be sufficient to allow the power supply | |
1535 | * to reach the minimum voltage. | |
1536 | */ | |
79bccc5a | 1537 | mmc_delay(10); |
1da177e4 | 1538 | |
88ae8b86 | 1539 | host->ios.clock = host->f_init; |
8dfd0374 | 1540 | |
1da177e4 | 1541 | host->ios.power_mode = MMC_POWER_ON; |
920e70c5 | 1542 | mmc_set_ios(host); |
1da177e4 | 1543 | |
f9996aee PO |
1544 | /* |
1545 | * This delay must be at least 74 clock sizes, or 1 ms, or the | |
1546 | * time required to reach a stable voltage. | |
1547 | */ | |
79bccc5a | 1548 | mmc_delay(10); |
778e277c MW |
1549 | |
1550 | mmc_host_clk_release(host); | |
1da177e4 LT |
1551 | } |
1552 | ||
7f7e4129 | 1553 | void mmc_power_off(struct mmc_host *host) |
1da177e4 | 1554 | { |
fa550189 UH |
1555 | if (host->ios.power_mode == MMC_POWER_OFF) |
1556 | return; | |
1557 | ||
778e277c MW |
1558 | mmc_host_clk_hold(host); |
1559 | ||
1da177e4 LT |
1560 | host->ios.clock = 0; |
1561 | host->ios.vdd = 0; | |
b33d46c3 | 1562 | |
bec8726a | 1563 | |
b33d46c3 UH |
1564 | /* |
1565 | * Reset ocr mask to be the highest possible voltage supported for | |
1566 | * this mmc host. This value will be used at next power up. | |
1567 | */ | |
1568 | host->ocr = 1 << (fls(host->ocr_avail) - 1); | |
1569 | ||
af517150 DB |
1570 | if (!mmc_host_is_spi(host)) { |
1571 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1572 | host->ios.chip_select = MMC_CS_DONTCARE; | |
1573 | } | |
1da177e4 | 1574 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 1575 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 1576 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 1577 | mmc_set_ios(host); |
778e277c | 1578 | |
041beb1d DD |
1579 | /* |
1580 | * Some configurations, such as the 802.11 SDIO card in the OLPC | |
1581 | * XO-1.5, require a short delay after poweroff before the card | |
1582 | * can be successfully turned on again. | |
1583 | */ | |
1584 | mmc_delay(1); | |
1585 | ||
778e277c | 1586 | mmc_host_clk_release(host); |
1da177e4 LT |
1587 | } |
1588 | ||
276e090f JR |
1589 | void mmc_power_cycle(struct mmc_host *host) |
1590 | { | |
1591 | mmc_power_off(host); | |
1592 | /* Wait at least 1 ms according to SD spec */ | |
1593 | mmc_delay(1); | |
1594 | mmc_power_up(host); | |
1595 | } | |
1596 | ||
39361851 AB |
1597 | /* |
1598 | * Cleanup when the last reference to the bus operator is dropped. | |
1599 | */ | |
261172fd | 1600 | static void __mmc_release_bus(struct mmc_host *host) |
39361851 AB |
1601 | { |
1602 | BUG_ON(!host); | |
1603 | BUG_ON(host->bus_refs); | |
1604 | BUG_ON(!host->bus_dead); | |
1605 | ||
1606 | host->bus_ops = NULL; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Increase reference count of bus operator | |
1611 | */ | |
1612 | static inline void mmc_bus_get(struct mmc_host *host) | |
1613 | { | |
1614 | unsigned long flags; | |
1615 | ||
1616 | spin_lock_irqsave(&host->lock, flags); | |
1617 | host->bus_refs++; | |
1618 | spin_unlock_irqrestore(&host->lock, flags); | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * Decrease reference count of bus operator and free it if | |
1623 | * it is the last reference. | |
1624 | */ | |
1625 | static inline void mmc_bus_put(struct mmc_host *host) | |
1626 | { | |
1627 | unsigned long flags; | |
1628 | ||
1629 | spin_lock_irqsave(&host->lock, flags); | |
1630 | host->bus_refs--; | |
1631 | if ((host->bus_refs == 0) && host->bus_ops) | |
1632 | __mmc_release_bus(host); | |
1633 | spin_unlock_irqrestore(&host->lock, flags); | |
1634 | } | |
1635 | ||
1da177e4 | 1636 | /* |
7ea239d9 PO |
1637 | * Assign a mmc bus handler to a host. Only one bus handler may control a |
1638 | * host at any given time. | |
1da177e4 | 1639 | */ |
7ea239d9 | 1640 | void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops) |
1da177e4 | 1641 | { |
7ea239d9 | 1642 | unsigned long flags; |
e45a1bd2 | 1643 | |
7ea239d9 PO |
1644 | BUG_ON(!host); |
1645 | BUG_ON(!ops); | |
b855885e | 1646 | |
d84075c8 | 1647 | WARN_ON(!host->claimed); |
bce40a36 | 1648 | |
7ea239d9 | 1649 | spin_lock_irqsave(&host->lock, flags); |
bce40a36 | 1650 | |
7ea239d9 PO |
1651 | BUG_ON(host->bus_ops); |
1652 | BUG_ON(host->bus_refs); | |
b57c43ad | 1653 | |
7ea239d9 PO |
1654 | host->bus_ops = ops; |
1655 | host->bus_refs = 1; | |
1656 | host->bus_dead = 0; | |
b57c43ad | 1657 | |
7ea239d9 | 1658 | spin_unlock_irqrestore(&host->lock, flags); |
b57c43ad PO |
1659 | } |
1660 | ||
7ea239d9 | 1661 | /* |
7f7e4129 | 1662 | * Remove the current bus handler from a host. |
7ea239d9 PO |
1663 | */ |
1664 | void mmc_detach_bus(struct mmc_host *host) | |
7ccd266e | 1665 | { |
7ea239d9 | 1666 | unsigned long flags; |
7ccd266e | 1667 | |
7ea239d9 | 1668 | BUG_ON(!host); |
7ccd266e | 1669 | |
d84075c8 PO |
1670 | WARN_ON(!host->claimed); |
1671 | WARN_ON(!host->bus_ops); | |
cd9277c0 | 1672 | |
7ea239d9 | 1673 | spin_lock_irqsave(&host->lock, flags); |
7ccd266e | 1674 | |
7ea239d9 | 1675 | host->bus_dead = 1; |
7ccd266e | 1676 | |
7ea239d9 | 1677 | spin_unlock_irqrestore(&host->lock, flags); |
1da177e4 | 1678 | |
7ea239d9 | 1679 | mmc_bus_put(host); |
1da177e4 LT |
1680 | } |
1681 | ||
1da177e4 LT |
1682 | /** |
1683 | * mmc_detect_change - process change of state on a MMC socket | |
1684 | * @host: host which changed state. | |
8dc00335 | 1685 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 | 1686 | * |
67a61c48 PO |
1687 | * MMC drivers should call this when they detect a card has been |
1688 | * inserted or removed. The MMC layer will confirm that any | |
1689 | * present card is still functional, and initialize any newly | |
1690 | * inserted. | |
1da177e4 | 1691 | */ |
8dc00335 | 1692 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1693 | { |
3b91e550 | 1694 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 | 1695 | unsigned long flags; |
01f41ec7 | 1696 | spin_lock_irqsave(&host->lock, flags); |
d84075c8 | 1697 | WARN_ON(host->removed); |
01f41ec7 | 1698 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 | 1699 | #endif |
d3049504 | 1700 | host->detect_change = 1; |
c4028958 | 1701 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1702 | } |
1703 | ||
1704 | EXPORT_SYMBOL(mmc_detect_change); | |
1705 | ||
dfe86cba AH |
1706 | void mmc_init_erase(struct mmc_card *card) |
1707 | { | |
1708 | unsigned int sz; | |
1709 | ||
1710 | if (is_power_of_2(card->erase_size)) | |
1711 | card->erase_shift = ffs(card->erase_size) - 1; | |
1712 | else | |
1713 | card->erase_shift = 0; | |
1714 | ||
1715 | /* | |
1716 | * It is possible to erase an arbitrarily large area of an SD or MMC | |
1717 | * card. That is not desirable because it can take a long time | |
1718 | * (minutes) potentially delaying more important I/O, and also the | |
1719 | * timeout calculations become increasingly hugely over-estimated. | |
1720 | * Consequently, 'pref_erase' is defined as a guide to limit erases | |
1721 | * to that size and alignment. | |
1722 | * | |
1723 | * For SD cards that define Allocation Unit size, limit erases to one | |
1724 | * Allocation Unit at a time. For MMC cards that define High Capacity | |
1725 | * Erase Size, whether it is switched on or not, limit to that size. | |
1726 | * Otherwise just have a stab at a good value. For modern cards it | |
1727 | * will end up being 4MiB. Note that if the value is too small, it | |
1728 | * can end up taking longer to erase. | |
1729 | */ | |
1730 | if (mmc_card_sd(card) && card->ssr.au) { | |
1731 | card->pref_erase = card->ssr.au; | |
1732 | card->erase_shift = ffs(card->ssr.au) - 1; | |
1733 | } else if (card->ext_csd.hc_erase_size) { | |
1734 | card->pref_erase = card->ext_csd.hc_erase_size; | |
1735 | } else { | |
1736 | sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11; | |
1737 | if (sz < 128) | |
1738 | card->pref_erase = 512 * 1024 / 512; | |
1739 | else if (sz < 512) | |
1740 | card->pref_erase = 1024 * 1024 / 512; | |
1741 | else if (sz < 1024) | |
1742 | card->pref_erase = 2 * 1024 * 1024 / 512; | |
1743 | else | |
1744 | card->pref_erase = 4 * 1024 * 1024 / 512; | |
1745 | if (card->pref_erase < card->erase_size) | |
1746 | card->pref_erase = card->erase_size; | |
1747 | else { | |
1748 | sz = card->pref_erase % card->erase_size; | |
1749 | if (sz) | |
1750 | card->pref_erase += card->erase_size - sz; | |
1751 | } | |
1752 | } | |
1753 | } | |
1754 | ||
eaa02f75 AW |
1755 | static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card, |
1756 | unsigned int arg, unsigned int qty) | |
dfe86cba AH |
1757 | { |
1758 | unsigned int erase_timeout; | |
1759 | ||
7194efb8 AH |
1760 | if (arg == MMC_DISCARD_ARG || |
1761 | (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) { | |
1762 | erase_timeout = card->ext_csd.trim_timeout; | |
1763 | } else if (card->ext_csd.erase_group_def & 1) { | |
dfe86cba AH |
1764 | /* High Capacity Erase Group Size uses HC timeouts */ |
1765 | if (arg == MMC_TRIM_ARG) | |
1766 | erase_timeout = card->ext_csd.trim_timeout; | |
1767 | else | |
1768 | erase_timeout = card->ext_csd.hc_erase_timeout; | |
1769 | } else { | |
1770 | /* CSD Erase Group Size uses write timeout */ | |
1771 | unsigned int mult = (10 << card->csd.r2w_factor); | |
1772 | unsigned int timeout_clks = card->csd.tacc_clks * mult; | |
1773 | unsigned int timeout_us; | |
1774 | ||
1775 | /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */ | |
1776 | if (card->csd.tacc_ns < 1000000) | |
1777 | timeout_us = (card->csd.tacc_ns * mult) / 1000; | |
1778 | else | |
1779 | timeout_us = (card->csd.tacc_ns / 1000) * mult; | |
1780 | ||
1781 | /* | |
1782 | * ios.clock is only a target. The real clock rate might be | |
1783 | * less but not that much less, so fudge it by multiplying by 2. | |
1784 | */ | |
1785 | timeout_clks <<= 1; | |
1786 | timeout_us += (timeout_clks * 1000) / | |
4cf8c6dd | 1787 | (mmc_host_clk_rate(card->host) / 1000); |
dfe86cba AH |
1788 | |
1789 | erase_timeout = timeout_us / 1000; | |
1790 | ||
1791 | /* | |
1792 | * Theoretically, the calculation could underflow so round up | |
1793 | * to 1ms in that case. | |
1794 | */ | |
1795 | if (!erase_timeout) | |
1796 | erase_timeout = 1; | |
1797 | } | |
1798 | ||
1799 | /* Multiplier for secure operations */ | |
1800 | if (arg & MMC_SECURE_ARGS) { | |
1801 | if (arg == MMC_SECURE_ERASE_ARG) | |
1802 | erase_timeout *= card->ext_csd.sec_erase_mult; | |
1803 | else | |
1804 | erase_timeout *= card->ext_csd.sec_trim_mult; | |
1805 | } | |
1806 | ||
1807 | erase_timeout *= qty; | |
1808 | ||
1809 | /* | |
1810 | * Ensure at least a 1 second timeout for SPI as per | |
1811 | * 'mmc_set_data_timeout()' | |
1812 | */ | |
1813 | if (mmc_host_is_spi(card->host) && erase_timeout < 1000) | |
1814 | erase_timeout = 1000; | |
1815 | ||
eaa02f75 | 1816 | return erase_timeout; |
dfe86cba AH |
1817 | } |
1818 | ||
eaa02f75 AW |
1819 | static unsigned int mmc_sd_erase_timeout(struct mmc_card *card, |
1820 | unsigned int arg, | |
1821 | unsigned int qty) | |
dfe86cba | 1822 | { |
eaa02f75 AW |
1823 | unsigned int erase_timeout; |
1824 | ||
dfe86cba AH |
1825 | if (card->ssr.erase_timeout) { |
1826 | /* Erase timeout specified in SD Status Register (SSR) */ | |
eaa02f75 AW |
1827 | erase_timeout = card->ssr.erase_timeout * qty + |
1828 | card->ssr.erase_offset; | |
dfe86cba AH |
1829 | } else { |
1830 | /* | |
1831 | * Erase timeout not specified in SD Status Register (SSR) so | |
1832 | * use 250ms per write block. | |
1833 | */ | |
eaa02f75 | 1834 | erase_timeout = 250 * qty; |
dfe86cba AH |
1835 | } |
1836 | ||
1837 | /* Must not be less than 1 second */ | |
eaa02f75 AW |
1838 | if (erase_timeout < 1000) |
1839 | erase_timeout = 1000; | |
1840 | ||
1841 | return erase_timeout; | |
dfe86cba AH |
1842 | } |
1843 | ||
eaa02f75 AW |
1844 | static unsigned int mmc_erase_timeout(struct mmc_card *card, |
1845 | unsigned int arg, | |
1846 | unsigned int qty) | |
dfe86cba AH |
1847 | { |
1848 | if (mmc_card_sd(card)) | |
eaa02f75 | 1849 | return mmc_sd_erase_timeout(card, arg, qty); |
dfe86cba | 1850 | else |
eaa02f75 | 1851 | return mmc_mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1852 | } |
1853 | ||
1854 | static int mmc_do_erase(struct mmc_card *card, unsigned int from, | |
1855 | unsigned int to, unsigned int arg) | |
1856 | { | |
1278dba1 | 1857 | struct mmc_command cmd = {0}; |
dfe86cba | 1858 | unsigned int qty = 0; |
8fee476b | 1859 | unsigned long timeout; |
dfe86cba AH |
1860 | int err; |
1861 | ||
1862 | /* | |
1863 | * qty is used to calculate the erase timeout which depends on how many | |
1864 | * erase groups (or allocation units in SD terminology) are affected. | |
1865 | * We count erasing part of an erase group as one erase group. | |
1866 | * For SD, the allocation units are always a power of 2. For MMC, the | |
1867 | * erase group size is almost certainly also power of 2, but it does not | |
1868 | * seem to insist on that in the JEDEC standard, so we fall back to | |
1869 | * division in that case. SD may not specify an allocation unit size, | |
1870 | * in which case the timeout is based on the number of write blocks. | |
1871 | * | |
1872 | * Note that the timeout for secure trim 2 will only be correct if the | |
1873 | * number of erase groups specified is the same as the total of all | |
1874 | * preceding secure trim 1 commands. Since the power may have been | |
1875 | * lost since the secure trim 1 commands occurred, it is generally | |
1876 | * impossible to calculate the secure trim 2 timeout correctly. | |
1877 | */ | |
1878 | if (card->erase_shift) | |
1879 | qty += ((to >> card->erase_shift) - | |
1880 | (from >> card->erase_shift)) + 1; | |
1881 | else if (mmc_card_sd(card)) | |
1882 | qty += to - from + 1; | |
1883 | else | |
1884 | qty += ((to / card->erase_size) - | |
1885 | (from / card->erase_size)) + 1; | |
1886 | ||
1887 | if (!mmc_card_blockaddr(card)) { | |
1888 | from <<= 9; | |
1889 | to <<= 9; | |
1890 | } | |
1891 | ||
dfe86cba AH |
1892 | if (mmc_card_sd(card)) |
1893 | cmd.opcode = SD_ERASE_WR_BLK_START; | |
1894 | else | |
1895 | cmd.opcode = MMC_ERASE_GROUP_START; | |
1896 | cmd.arg = from; | |
1897 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1898 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1899 | if (err) { | |
a3c76eb9 | 1900 | pr_err("mmc_erase: group start error %d, " |
dfe86cba | 1901 | "status %#x\n", err, cmd.resp[0]); |
67716327 | 1902 | err = -EIO; |
dfe86cba AH |
1903 | goto out; |
1904 | } | |
1905 | ||
1906 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1907 | if (mmc_card_sd(card)) | |
1908 | cmd.opcode = SD_ERASE_WR_BLK_END; | |
1909 | else | |
1910 | cmd.opcode = MMC_ERASE_GROUP_END; | |
1911 | cmd.arg = to; | |
1912 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
1913 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1914 | if (err) { | |
a3c76eb9 | 1915 | pr_err("mmc_erase: group end error %d, status %#x\n", |
dfe86cba | 1916 | err, cmd.resp[0]); |
67716327 | 1917 | err = -EIO; |
dfe86cba AH |
1918 | goto out; |
1919 | } | |
1920 | ||
1921 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1922 | cmd.opcode = MMC_ERASE; | |
1923 | cmd.arg = arg; | |
1924 | cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; | |
eaa02f75 | 1925 | cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty); |
dfe86cba AH |
1926 | err = mmc_wait_for_cmd(card->host, &cmd, 0); |
1927 | if (err) { | |
a3c76eb9 | 1928 | pr_err("mmc_erase: erase error %d, status %#x\n", |
dfe86cba AH |
1929 | err, cmd.resp[0]); |
1930 | err = -EIO; | |
1931 | goto out; | |
1932 | } | |
1933 | ||
1934 | if (mmc_host_is_spi(card->host)) | |
1935 | goto out; | |
1936 | ||
8fee476b | 1937 | timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS); |
dfe86cba AH |
1938 | do { |
1939 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1940 | cmd.opcode = MMC_SEND_STATUS; | |
1941 | cmd.arg = card->rca << 16; | |
1942 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
1943 | /* Do not retry else we can't see errors */ | |
1944 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
1945 | if (err || (cmd.resp[0] & 0xFDF92000)) { | |
a3c76eb9 | 1946 | pr_err("error %d requesting status %#x\n", |
dfe86cba AH |
1947 | err, cmd.resp[0]); |
1948 | err = -EIO; | |
1949 | goto out; | |
1950 | } | |
8fee476b TR |
1951 | |
1952 | /* Timeout if the device never becomes ready for data and | |
1953 | * never leaves the program state. | |
1954 | */ | |
1955 | if (time_after(jiffies, timeout)) { | |
1956 | pr_err("%s: Card stuck in programming state! %s\n", | |
1957 | mmc_hostname(card->host), __func__); | |
1958 | err = -EIO; | |
1959 | goto out; | |
1960 | } | |
1961 | ||
dfe86cba | 1962 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || |
8fee476b | 1963 | (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)); |
dfe86cba AH |
1964 | out: |
1965 | return err; | |
1966 | } | |
1967 | ||
1968 | /** | |
1969 | * mmc_erase - erase sectors. | |
1970 | * @card: card to erase | |
1971 | * @from: first sector to erase | |
1972 | * @nr: number of sectors to erase | |
1973 | * @arg: erase command argument (SD supports only %MMC_ERASE_ARG) | |
1974 | * | |
1975 | * Caller must claim host before calling this function. | |
1976 | */ | |
1977 | int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr, | |
1978 | unsigned int arg) | |
1979 | { | |
1980 | unsigned int rem, to = from + nr; | |
1981 | ||
1982 | if (!(card->host->caps & MMC_CAP_ERASE) || | |
1983 | !(card->csd.cmdclass & CCC_ERASE)) | |
1984 | return -EOPNOTSUPP; | |
1985 | ||
1986 | if (!card->erase_size) | |
1987 | return -EOPNOTSUPP; | |
1988 | ||
1989 | if (mmc_card_sd(card) && arg != MMC_ERASE_ARG) | |
1990 | return -EOPNOTSUPP; | |
1991 | ||
1992 | if ((arg & MMC_SECURE_ARGS) && | |
1993 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)) | |
1994 | return -EOPNOTSUPP; | |
1995 | ||
1996 | if ((arg & MMC_TRIM_ARGS) && | |
1997 | !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)) | |
1998 | return -EOPNOTSUPP; | |
1999 | ||
2000 | if (arg == MMC_SECURE_ERASE_ARG) { | |
2001 | if (from % card->erase_size || nr % card->erase_size) | |
2002 | return -EINVAL; | |
2003 | } | |
2004 | ||
2005 | if (arg == MMC_ERASE_ARG) { | |
2006 | rem = from % card->erase_size; | |
2007 | if (rem) { | |
2008 | rem = card->erase_size - rem; | |
2009 | from += rem; | |
2010 | if (nr > rem) | |
2011 | nr -= rem; | |
2012 | else | |
2013 | return 0; | |
2014 | } | |
2015 | rem = nr % card->erase_size; | |
2016 | if (rem) | |
2017 | nr -= rem; | |
2018 | } | |
2019 | ||
2020 | if (nr == 0) | |
2021 | return 0; | |
2022 | ||
2023 | to = from + nr; | |
2024 | ||
2025 | if (to <= from) | |
2026 | return -EINVAL; | |
2027 | ||
2028 | /* 'from' and 'to' are inclusive */ | |
2029 | to -= 1; | |
2030 | ||
2031 | return mmc_do_erase(card, from, to, arg); | |
2032 | } | |
2033 | EXPORT_SYMBOL(mmc_erase); | |
2034 | ||
2035 | int mmc_can_erase(struct mmc_card *card) | |
2036 | { | |
2037 | if ((card->host->caps & MMC_CAP_ERASE) && | |
2038 | (card->csd.cmdclass & CCC_ERASE) && card->erase_size) | |
2039 | return 1; | |
2040 | return 0; | |
2041 | } | |
2042 | EXPORT_SYMBOL(mmc_can_erase); | |
2043 | ||
2044 | int mmc_can_trim(struct mmc_card *card) | |
2045 | { | |
2046 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) | |
2047 | return 1; | |
2048 | return 0; | |
2049 | } | |
2050 | EXPORT_SYMBOL(mmc_can_trim); | |
2051 | ||
b3bf9153 KP |
2052 | int mmc_can_discard(struct mmc_card *card) |
2053 | { | |
2054 | /* | |
2055 | * As there's no way to detect the discard support bit at v4.5 | |
2056 | * use the s/w feature support filed. | |
2057 | */ | |
2058 | if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE) | |
2059 | return 1; | |
2060 | return 0; | |
2061 | } | |
2062 | EXPORT_SYMBOL(mmc_can_discard); | |
2063 | ||
d9ddd629 KP |
2064 | int mmc_can_sanitize(struct mmc_card *card) |
2065 | { | |
28302812 AH |
2066 | if (!mmc_can_trim(card) && !mmc_can_erase(card)) |
2067 | return 0; | |
d9ddd629 KP |
2068 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE) |
2069 | return 1; | |
2070 | return 0; | |
2071 | } | |
2072 | EXPORT_SYMBOL(mmc_can_sanitize); | |
2073 | ||
dfe86cba AH |
2074 | int mmc_can_secure_erase_trim(struct mmc_card *card) |
2075 | { | |
2076 | if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) | |
2077 | return 1; | |
2078 | return 0; | |
2079 | } | |
2080 | EXPORT_SYMBOL(mmc_can_secure_erase_trim); | |
2081 | ||
2082 | int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, | |
2083 | unsigned int nr) | |
2084 | { | |
2085 | if (!card->erase_size) | |
2086 | return 0; | |
2087 | if (from % card->erase_size || nr % card->erase_size) | |
2088 | return 0; | |
2089 | return 1; | |
2090 | } | |
2091 | EXPORT_SYMBOL(mmc_erase_group_aligned); | |
1da177e4 | 2092 | |
e056a1b5 AH |
2093 | static unsigned int mmc_do_calc_max_discard(struct mmc_card *card, |
2094 | unsigned int arg) | |
2095 | { | |
2096 | struct mmc_host *host = card->host; | |
2097 | unsigned int max_discard, x, y, qty = 0, max_qty, timeout; | |
2098 | unsigned int last_timeout = 0; | |
2099 | ||
2100 | if (card->erase_shift) | |
2101 | max_qty = UINT_MAX >> card->erase_shift; | |
2102 | else if (mmc_card_sd(card)) | |
2103 | max_qty = UINT_MAX; | |
2104 | else | |
2105 | max_qty = UINT_MAX / card->erase_size; | |
2106 | ||
2107 | /* Find the largest qty with an OK timeout */ | |
2108 | do { | |
2109 | y = 0; | |
2110 | for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) { | |
2111 | timeout = mmc_erase_timeout(card, arg, qty + x); | |
2112 | if (timeout > host->max_discard_to) | |
2113 | break; | |
2114 | if (timeout < last_timeout) | |
2115 | break; | |
2116 | last_timeout = timeout; | |
2117 | y = x; | |
2118 | } | |
2119 | qty += y; | |
2120 | } while (y); | |
2121 | ||
2122 | if (!qty) | |
2123 | return 0; | |
2124 | ||
2125 | if (qty == 1) | |
2126 | return 1; | |
2127 | ||
2128 | /* Convert qty to sectors */ | |
2129 | if (card->erase_shift) | |
2130 | max_discard = --qty << card->erase_shift; | |
2131 | else if (mmc_card_sd(card)) | |
2132 | max_discard = qty; | |
2133 | else | |
2134 | max_discard = --qty * card->erase_size; | |
2135 | ||
2136 | return max_discard; | |
2137 | } | |
2138 | ||
2139 | unsigned int mmc_calc_max_discard(struct mmc_card *card) | |
2140 | { | |
2141 | struct mmc_host *host = card->host; | |
2142 | unsigned int max_discard, max_trim; | |
2143 | ||
2144 | if (!host->max_discard_to) | |
2145 | return UINT_MAX; | |
2146 | ||
2147 | /* | |
2148 | * Without erase_group_def set, MMC erase timeout depends on clock | |
2149 | * frequence which can change. In that case, the best choice is | |
2150 | * just the preferred erase size. | |
2151 | */ | |
2152 | if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1)) | |
2153 | return card->pref_erase; | |
2154 | ||
2155 | max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG); | |
2156 | if (mmc_can_trim(card)) { | |
2157 | max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG); | |
2158 | if (max_trim < max_discard) | |
2159 | max_discard = max_trim; | |
2160 | } else if (max_discard < card->erase_size) { | |
2161 | max_discard = 0; | |
2162 | } | |
2163 | pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n", | |
2164 | mmc_hostname(host), max_discard, host->max_discard_to); | |
2165 | return max_discard; | |
2166 | } | |
2167 | EXPORT_SYMBOL(mmc_calc_max_discard); | |
2168 | ||
0f8d8ea6 AH |
2169 | int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen) |
2170 | { | |
1278dba1 | 2171 | struct mmc_command cmd = {0}; |
0f8d8ea6 AH |
2172 | |
2173 | if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card)) | |
2174 | return 0; | |
2175 | ||
0f8d8ea6 AH |
2176 | cmd.opcode = MMC_SET_BLOCKLEN; |
2177 | cmd.arg = blocklen; | |
2178 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2179 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2180 | } | |
2181 | EXPORT_SYMBOL(mmc_set_blocklen); | |
2182 | ||
67c79db8 LP |
2183 | int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount, |
2184 | bool is_rel_write) | |
2185 | { | |
2186 | struct mmc_command cmd = {0}; | |
2187 | ||
2188 | cmd.opcode = MMC_SET_BLOCK_COUNT; | |
2189 | cmd.arg = blockcount & 0x0000FFFF; | |
2190 | if (is_rel_write) | |
2191 | cmd.arg |= 1 << 31; | |
2192 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; | |
2193 | return mmc_wait_for_cmd(card->host, &cmd, 5); | |
2194 | } | |
2195 | EXPORT_SYMBOL(mmc_set_blockcount); | |
2196 | ||
b2499518 AH |
2197 | static void mmc_hw_reset_for_init(struct mmc_host *host) |
2198 | { | |
2199 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2200 | return; | |
2201 | mmc_host_clk_hold(host); | |
2202 | host->ops->hw_reset(host); | |
2203 | mmc_host_clk_release(host); | |
2204 | } | |
2205 | ||
2206 | int mmc_can_reset(struct mmc_card *card) | |
2207 | { | |
2208 | u8 rst_n_function; | |
2209 | ||
2210 | if (!mmc_card_mmc(card)) | |
2211 | return 0; | |
2212 | rst_n_function = card->ext_csd.rst_n_function; | |
2213 | if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED) | |
2214 | return 0; | |
2215 | return 1; | |
2216 | } | |
2217 | EXPORT_SYMBOL(mmc_can_reset); | |
2218 | ||
2219 | static int mmc_do_hw_reset(struct mmc_host *host, int check) | |
2220 | { | |
2221 | struct mmc_card *card = host->card; | |
2222 | ||
2223 | if (!host->bus_ops->power_restore) | |
2224 | return -EOPNOTSUPP; | |
2225 | ||
2226 | if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset) | |
2227 | return -EOPNOTSUPP; | |
2228 | ||
2229 | if (!card) | |
2230 | return -EINVAL; | |
2231 | ||
2232 | if (!mmc_can_reset(card)) | |
2233 | return -EOPNOTSUPP; | |
2234 | ||
2235 | mmc_host_clk_hold(host); | |
2236 | mmc_set_clock(host, host->f_init); | |
2237 | ||
2238 | host->ops->hw_reset(host); | |
2239 | ||
2240 | /* If the reset has happened, then a status command will fail */ | |
2241 | if (check) { | |
2242 | struct mmc_command cmd = {0}; | |
2243 | int err; | |
2244 | ||
2245 | cmd.opcode = MMC_SEND_STATUS; | |
2246 | if (!mmc_host_is_spi(card->host)) | |
2247 | cmd.arg = card->rca << 16; | |
2248 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
2249 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
2250 | if (!err) { | |
2251 | mmc_host_clk_release(host); | |
2252 | return -ENOSYS; | |
2253 | } | |
2254 | } | |
2255 | ||
2256 | host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR); | |
2257 | if (mmc_host_is_spi(host)) { | |
2258 | host->ios.chip_select = MMC_CS_HIGH; | |
2259 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
2260 | } else { | |
2261 | host->ios.chip_select = MMC_CS_DONTCARE; | |
2262 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
2263 | } | |
2264 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
2265 | host->ios.timing = MMC_TIMING_LEGACY; | |
2266 | mmc_set_ios(host); | |
2267 | ||
2268 | mmc_host_clk_release(host); | |
2269 | ||
2270 | return host->bus_ops->power_restore(host); | |
2271 | } | |
2272 | ||
2273 | int mmc_hw_reset(struct mmc_host *host) | |
2274 | { | |
2275 | return mmc_do_hw_reset(host, 0); | |
2276 | } | |
2277 | EXPORT_SYMBOL(mmc_hw_reset); | |
2278 | ||
2279 | int mmc_hw_reset_check(struct mmc_host *host) | |
2280 | { | |
2281 | return mmc_do_hw_reset(host, 1); | |
2282 | } | |
2283 | EXPORT_SYMBOL(mmc_hw_reset_check); | |
2284 | ||
807e8e40 AR |
2285 | static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) |
2286 | { | |
2287 | host->f_init = freq; | |
2288 | ||
2289 | #ifdef CONFIG_MMC_DEBUG | |
2290 | pr_info("%s: %s: trying to init card at %u Hz\n", | |
2291 | mmc_hostname(host), __func__, host->f_init); | |
2292 | #endif | |
2293 | mmc_power_up(host); | |
2f94e55a | 2294 | |
b2499518 AH |
2295 | /* |
2296 | * Some eMMCs (with VCCQ always on) may not be reset after power up, so | |
2297 | * do a hardware reset if possible. | |
2298 | */ | |
2299 | mmc_hw_reset_for_init(host); | |
2300 | ||
2f94e55a PR |
2301 | /* |
2302 | * sdio_reset sends CMD52 to reset card. Since we do not know | |
2303 | * if the card is being re-initialized, just send it. CMD52 | |
2304 | * should be ignored by SD/eMMC cards. | |
2305 | */ | |
807e8e40 AR |
2306 | sdio_reset(host); |
2307 | mmc_go_idle(host); | |
2308 | ||
2309 | mmc_send_if_cond(host, host->ocr_avail); | |
2310 | ||
2311 | /* Order's important: probe SDIO, then SD, then MMC */ | |
2312 | if (!mmc_attach_sdio(host)) | |
2313 | return 0; | |
2314 | if (!mmc_attach_sd(host)) | |
2315 | return 0; | |
2316 | if (!mmc_attach_mmc(host)) | |
2317 | return 0; | |
2318 | ||
2319 | mmc_power_off(host); | |
2320 | return -EIO; | |
2321 | } | |
2322 | ||
d3049504 AH |
2323 | int _mmc_detect_card_removed(struct mmc_host *host) |
2324 | { | |
2325 | int ret; | |
2326 | ||
2327 | if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive) | |
2328 | return 0; | |
2329 | ||
2330 | if (!host->card || mmc_card_removed(host->card)) | |
2331 | return 1; | |
2332 | ||
2333 | ret = host->bus_ops->alive(host); | |
1450734e KL |
2334 | |
2335 | /* | |
2336 | * Card detect status and alive check may be out of sync if card is | |
2337 | * removed slowly, when card detect switch changes while card/slot | |
2338 | * pads are still contacted in hardware (refer to "SD Card Mechanical | |
2339 | * Addendum, Appendix C: Card Detection Switch"). So reschedule a | |
2340 | * detect work 200ms later for this case. | |
2341 | */ | |
2342 | if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) { | |
2343 | mmc_detect_change(host, msecs_to_jiffies(200)); | |
2344 | pr_debug("%s: card removed too slowly\n", mmc_hostname(host)); | |
2345 | } | |
2346 | ||
d3049504 AH |
2347 | if (ret) { |
2348 | mmc_card_set_removed(host->card); | |
2349 | pr_debug("%s: card remove detected\n", mmc_hostname(host)); | |
2350 | } | |
2351 | ||
2352 | return ret; | |
2353 | } | |
2354 | ||
2355 | int mmc_detect_card_removed(struct mmc_host *host) | |
2356 | { | |
2357 | struct mmc_card *card = host->card; | |
f0cc9cf9 | 2358 | int ret; |
d3049504 AH |
2359 | |
2360 | WARN_ON(!host->claimed); | |
f0cc9cf9 UH |
2361 | |
2362 | if (!card) | |
2363 | return 1; | |
2364 | ||
2365 | ret = mmc_card_removed(card); | |
d3049504 AH |
2366 | /* |
2367 | * The card will be considered unchanged unless we have been asked to | |
2368 | * detect a change or host requires polling to provide card detection. | |
2369 | */ | |
b6891679 | 2370 | if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)) |
f0cc9cf9 | 2371 | return ret; |
d3049504 AH |
2372 | |
2373 | host->detect_change = 0; | |
f0cc9cf9 UH |
2374 | if (!ret) { |
2375 | ret = _mmc_detect_card_removed(host); | |
b6891679 | 2376 | if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) { |
f0cc9cf9 UH |
2377 | /* |
2378 | * Schedule a detect work as soon as possible to let a | |
2379 | * rescan handle the card removal. | |
2380 | */ | |
2381 | cancel_delayed_work(&host->detect); | |
2382 | mmc_detect_change(host, 0); | |
2383 | } | |
2384 | } | |
d3049504 | 2385 | |
f0cc9cf9 | 2386 | return ret; |
d3049504 AH |
2387 | } |
2388 | EXPORT_SYMBOL(mmc_detect_card_removed); | |
2389 | ||
b93931a6 | 2390 | void mmc_rescan(struct work_struct *work) |
1da177e4 | 2391 | { |
c4028958 DH |
2392 | struct mmc_host *host = |
2393 | container_of(work, struct mmc_host, detect.work); | |
88ae8b86 | 2394 | int i; |
4c2ef25f | 2395 | |
807e8e40 | 2396 | if (host->rescan_disable) |
4c2ef25f | 2397 | return; |
1da177e4 | 2398 | |
3339d1e3 JR |
2399 | /* If there is a non-removable card registered, only scan once */ |
2400 | if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered) | |
2401 | return; | |
2402 | host->rescan_entered = 1; | |
2403 | ||
7ea239d9 | 2404 | mmc_bus_get(host); |
b855885e | 2405 | |
30201e7f OBC |
2406 | /* |
2407 | * if there is a _removable_ card registered, check whether it is | |
2408 | * still present | |
2409 | */ | |
2410 | if (host->bus_ops && host->bus_ops->detect && !host->bus_dead | |
bad3baba | 2411 | && !(host->caps & MMC_CAP_NONREMOVABLE)) |
94d89efb JS |
2412 | host->bus_ops->detect(host); |
2413 | ||
d3049504 AH |
2414 | host->detect_change = 0; |
2415 | ||
c5841798 CB |
2416 | /* |
2417 | * Let mmc_bus_put() free the bus/bus_ops if we've found that | |
2418 | * the card is no longer present. | |
2419 | */ | |
94d89efb | 2420 | mmc_bus_put(host); |
94d89efb JS |
2421 | mmc_bus_get(host); |
2422 | ||
2423 | /* if there still is a card present, stop here */ | |
2424 | if (host->bus_ops != NULL) { | |
7ea239d9 | 2425 | mmc_bus_put(host); |
94d89efb JS |
2426 | goto out; |
2427 | } | |
1da177e4 | 2428 | |
94d89efb JS |
2429 | /* |
2430 | * Only we can add a new handler, so it's safe to | |
2431 | * release the lock here. | |
2432 | */ | |
2433 | mmc_bus_put(host); | |
1da177e4 | 2434 | |
fa550189 UH |
2435 | if (host->ops->get_cd && host->ops->get_cd(host) == 0) { |
2436 | mmc_claim_host(host); | |
2437 | mmc_power_off(host); | |
2438 | mmc_release_host(host); | |
94d89efb | 2439 | goto out; |
fa550189 | 2440 | } |
1da177e4 | 2441 | |
807e8e40 | 2442 | mmc_claim_host(host); |
88ae8b86 | 2443 | for (i = 0; i < ARRAY_SIZE(freqs); i++) { |
807e8e40 AR |
2444 | if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) |
2445 | break; | |
06b2233a | 2446 | if (freqs[i] <= host->f_min) |
807e8e40 | 2447 | break; |
88ae8b86 | 2448 | } |
807e8e40 AR |
2449 | mmc_release_host(host); |
2450 | ||
2451 | out: | |
28f52482 AV |
2452 | if (host->caps & MMC_CAP_NEEDS_POLL) |
2453 | mmc_schedule_delayed_work(&host->detect, HZ); | |
1da177e4 LT |
2454 | } |
2455 | ||
b93931a6 | 2456 | void mmc_start_host(struct mmc_host *host) |
1da177e4 | 2457 | { |
fa550189 | 2458 | host->f_init = max(freqs[0], host->f_min); |
d9adcc12 | 2459 | host->rescan_disable = 0; |
a08b17be AH |
2460 | if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP) |
2461 | mmc_power_off(host); | |
2462 | else | |
0d3e3350 | 2463 | mmc_power_up(host); |
b93931a6 | 2464 | mmc_detect_change(host, 0); |
1da177e4 LT |
2465 | } |
2466 | ||
b93931a6 | 2467 | void mmc_stop_host(struct mmc_host *host) |
1da177e4 | 2468 | { |
3b91e550 | 2469 | #ifdef CONFIG_MMC_DEBUG |
1efd48b3 PO |
2470 | unsigned long flags; |
2471 | spin_lock_irqsave(&host->lock, flags); | |
3b91e550 | 2472 | host->removed = 1; |
1efd48b3 | 2473 | spin_unlock_irqrestore(&host->lock, flags); |
3b91e550 PO |
2474 | #endif |
2475 | ||
d9adcc12 | 2476 | host->rescan_disable = 1; |
d9bcbf34 | 2477 | cancel_delayed_work_sync(&host->detect); |
3b91e550 PO |
2478 | mmc_flush_scheduled_work(); |
2479 | ||
da68c4eb NP |
2480 | /* clear pm flags now and let card drivers set them as needed */ |
2481 | host->pm_flags = 0; | |
2482 | ||
7ea239d9 PO |
2483 | mmc_bus_get(host); |
2484 | if (host->bus_ops && !host->bus_dead) { | |
0db13fc2 | 2485 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2486 | host->bus_ops->remove(host); |
7ea239d9 PO |
2487 | mmc_claim_host(host); |
2488 | mmc_detach_bus(host); | |
7f7e4129 | 2489 | mmc_power_off(host); |
7ea239d9 | 2490 | mmc_release_host(host); |
53509f0f DK |
2491 | mmc_bus_put(host); |
2492 | return; | |
1da177e4 | 2493 | } |
7ea239d9 PO |
2494 | mmc_bus_put(host); |
2495 | ||
2496 | BUG_ON(host->card); | |
1da177e4 LT |
2497 | |
2498 | mmc_power_off(host); | |
2499 | } | |
2500 | ||
12ae637f | 2501 | int mmc_power_save_host(struct mmc_host *host) |
eae1aeee | 2502 | { |
12ae637f OBC |
2503 | int ret = 0; |
2504 | ||
bb9cab94 DD |
2505 | #ifdef CONFIG_MMC_DEBUG |
2506 | pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__); | |
2507 | #endif | |
2508 | ||
eae1aeee AH |
2509 | mmc_bus_get(host); |
2510 | ||
2511 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2512 | mmc_bus_put(host); | |
12ae637f | 2513 | return -EINVAL; |
eae1aeee AH |
2514 | } |
2515 | ||
2516 | if (host->bus_ops->power_save) | |
12ae637f | 2517 | ret = host->bus_ops->power_save(host); |
eae1aeee AH |
2518 | |
2519 | mmc_bus_put(host); | |
2520 | ||
2521 | mmc_power_off(host); | |
12ae637f OBC |
2522 | |
2523 | return ret; | |
eae1aeee AH |
2524 | } |
2525 | EXPORT_SYMBOL(mmc_power_save_host); | |
2526 | ||
12ae637f | 2527 | int mmc_power_restore_host(struct mmc_host *host) |
eae1aeee | 2528 | { |
12ae637f OBC |
2529 | int ret; |
2530 | ||
bb9cab94 DD |
2531 | #ifdef CONFIG_MMC_DEBUG |
2532 | pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__); | |
2533 | #endif | |
2534 | ||
eae1aeee AH |
2535 | mmc_bus_get(host); |
2536 | ||
2537 | if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) { | |
2538 | mmc_bus_put(host); | |
12ae637f | 2539 | return -EINVAL; |
eae1aeee AH |
2540 | } |
2541 | ||
2542 | mmc_power_up(host); | |
12ae637f | 2543 | ret = host->bus_ops->power_restore(host); |
eae1aeee AH |
2544 | |
2545 | mmc_bus_put(host); | |
12ae637f OBC |
2546 | |
2547 | return ret; | |
eae1aeee AH |
2548 | } |
2549 | EXPORT_SYMBOL(mmc_power_restore_host); | |
2550 | ||
881d1c25 SJ |
2551 | /* |
2552 | * Flush the cache to the non-volatile storage. | |
2553 | */ | |
2554 | int mmc_flush_cache(struct mmc_card *card) | |
2555 | { | |
2556 | struct mmc_host *host = card->host; | |
2557 | int err = 0; | |
2558 | ||
2559 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL)) | |
2560 | return err; | |
2561 | ||
2562 | if (mmc_card_mmc(card) && | |
2563 | (card->ext_csd.cache_size > 0) && | |
2564 | (card->ext_csd.cache_ctrl & 1)) { | |
2565 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, | |
2566 | EXT_CSD_FLUSH_CACHE, 1, 0); | |
2567 | if (err) | |
2568 | pr_err("%s: cache flush error %d\n", | |
2569 | mmc_hostname(card->host), err); | |
2570 | } | |
2571 | ||
2572 | return err; | |
2573 | } | |
2574 | EXPORT_SYMBOL(mmc_flush_cache); | |
2575 | ||
2576 | /* | |
2577 | * Turn the cache ON/OFF. | |
2578 | * Turning the cache OFF shall trigger flushing of the data | |
2579 | * to the non-volatile storage. | |
881d926d | 2580 | * This function should be called with host claimed |
881d1c25 SJ |
2581 | */ |
2582 | int mmc_cache_ctrl(struct mmc_host *host, u8 enable) | |
2583 | { | |
2584 | struct mmc_card *card = host->card; | |
8bc0678b | 2585 | unsigned int timeout; |
881d1c25 SJ |
2586 | int err = 0; |
2587 | ||
2588 | if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) || | |
2589 | mmc_card_is_removable(host)) | |
2590 | return err; | |
2591 | ||
2592 | if (card && mmc_card_mmc(card) && | |
2593 | (card->ext_csd.cache_size > 0)) { | |
2594 | enable = !!enable; | |
2595 | ||
8bc0678b SJ |
2596 | if (card->ext_csd.cache_ctrl ^ enable) { |
2597 | timeout = enable ? card->ext_csd.generic_cmd6_time : 0; | |
881d1c25 | 2598 | err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, |
8bc0678b SJ |
2599 | EXT_CSD_CACHE_CTRL, enable, timeout); |
2600 | if (err) | |
2601 | pr_err("%s: cache %s error %d\n", | |
2602 | mmc_hostname(card->host), | |
2603 | enable ? "on" : "off", | |
2604 | err); | |
2605 | else | |
2606 | card->ext_csd.cache_ctrl = enable; | |
2607 | } | |
881d1c25 SJ |
2608 | } |
2609 | ||
2610 | return err; | |
2611 | } | |
2612 | EXPORT_SYMBOL(mmc_cache_ctrl); | |
2613 | ||
1da177e4 LT |
2614 | #ifdef CONFIG_PM |
2615 | ||
2616 | /** | |
2617 | * mmc_suspend_host - suspend a host | |
2618 | * @host: mmc host | |
1da177e4 | 2619 | */ |
1a13f8fa | 2620 | int mmc_suspend_host(struct mmc_host *host) |
1da177e4 | 2621 | { |
986892ca UH |
2622 | /* This function is deprecated */ |
2623 | return 0; | |
1da177e4 | 2624 | } |
1da177e4 LT |
2625 | EXPORT_SYMBOL(mmc_suspend_host); |
2626 | ||
2627 | /** | |
2628 | * mmc_resume_host - resume a previously suspended host | |
2629 | * @host: mmc host | |
2630 | */ | |
2631 | int mmc_resume_host(struct mmc_host *host) | |
2632 | { | |
986892ca | 2633 | /* This function is deprecated */ |
74590263 | 2634 | return 0; |
1da177e4 | 2635 | } |
1da177e4 LT |
2636 | EXPORT_SYMBOL(mmc_resume_host); |
2637 | ||
4c2ef25f ML |
2638 | /* Do the card removal on suspend if card is assumed removeable |
2639 | * Do that in pm notifier while userspace isn't yet frozen, so we will be able | |
2640 | to sync the card. | |
2641 | */ | |
2642 | int mmc_pm_notify(struct notifier_block *notify_block, | |
2643 | unsigned long mode, void *unused) | |
2644 | { | |
2645 | struct mmc_host *host = container_of( | |
2646 | notify_block, struct mmc_host, pm_notify); | |
2647 | unsigned long flags; | |
810caddb | 2648 | int err = 0; |
4c2ef25f ML |
2649 | |
2650 | switch (mode) { | |
2651 | case PM_HIBERNATION_PREPARE: | |
2652 | case PM_SUSPEND_PREPARE: | |
4c2ef25f ML |
2653 | spin_lock_irqsave(&host->lock, flags); |
2654 | host->rescan_disable = 1; | |
2655 | spin_unlock_irqrestore(&host->lock, flags); | |
2656 | cancel_delayed_work_sync(&host->detect); | |
2657 | ||
810caddb UH |
2658 | if (!host->bus_ops) |
2659 | break; | |
2660 | ||
2661 | /* Validate prerequisites for suspend */ | |
2662 | if (host->bus_ops->pre_suspend) | |
2663 | err = host->bus_ops->pre_suspend(host); | |
2664 | if (!err && host->bus_ops->suspend) | |
4c2ef25f ML |
2665 | break; |
2666 | ||
0db13fc2 | 2667 | /* Calling bus_ops->remove() with a claimed host can deadlock */ |
58a8a4a1 | 2668 | host->bus_ops->remove(host); |
0db13fc2 | 2669 | mmc_claim_host(host); |
4c2ef25f | 2670 | mmc_detach_bus(host); |
7f7e4129 | 2671 | mmc_power_off(host); |
4c2ef25f ML |
2672 | mmc_release_host(host); |
2673 | host->pm_flags = 0; | |
2674 | break; | |
2675 | ||
2676 | case PM_POST_SUSPEND: | |
2677 | case PM_POST_HIBERNATION: | |
274476f8 | 2678 | case PM_POST_RESTORE: |
4c2ef25f ML |
2679 | |
2680 | spin_lock_irqsave(&host->lock, flags); | |
2681 | host->rescan_disable = 0; | |
2682 | spin_unlock_irqrestore(&host->lock, flags); | |
2683 | mmc_detect_change(host, 0); | |
2684 | ||
2685 | } | |
2686 | ||
2687 | return 0; | |
2688 | } | |
1da177e4 LT |
2689 | #endif |
2690 | ||
2220eedf KD |
2691 | /** |
2692 | * mmc_init_context_info() - init synchronization context | |
2693 | * @host: mmc host | |
2694 | * | |
2695 | * Init struct context_info needed to implement asynchronous | |
2696 | * request mechanism, used by mmc core, host driver and mmc requests | |
2697 | * supplier. | |
2698 | */ | |
2699 | void mmc_init_context_info(struct mmc_host *host) | |
2700 | { | |
2701 | spin_lock_init(&host->context_info.lock); | |
2702 | host->context_info.is_new_req = false; | |
2703 | host->context_info.is_done_rcv = false; | |
2704 | host->context_info.is_waiting_last_req = false; | |
2705 | init_waitqueue_head(&host->context_info.wait); | |
2706 | } | |
2707 | ||
ffce2e7e PO |
2708 | static int __init mmc_init(void) |
2709 | { | |
2710 | int ret; | |
2711 | ||
0d9ee5b2 | 2712 | workqueue = alloc_ordered_workqueue("kmmcd", 0); |
ffce2e7e PO |
2713 | if (!workqueue) |
2714 | return -ENOMEM; | |
2715 | ||
2716 | ret = mmc_register_bus(); | |
e29a7d73 PO |
2717 | if (ret) |
2718 | goto destroy_workqueue; | |
2719 | ||
2720 | ret = mmc_register_host_class(); | |
2721 | if (ret) | |
2722 | goto unregister_bus; | |
2723 | ||
2724 | ret = sdio_register_bus(); | |
2725 | if (ret) | |
2726 | goto unregister_host_class; | |
2727 | ||
2728 | return 0; | |
2729 | ||
2730 | unregister_host_class: | |
2731 | mmc_unregister_host_class(); | |
2732 | unregister_bus: | |
2733 | mmc_unregister_bus(); | |
2734 | destroy_workqueue: | |
2735 | destroy_workqueue(workqueue); | |
2736 | ||
ffce2e7e PO |
2737 | return ret; |
2738 | } | |
2739 | ||
2740 | static void __exit mmc_exit(void) | |
2741 | { | |
e29a7d73 | 2742 | sdio_unregister_bus(); |
ffce2e7e PO |
2743 | mmc_unregister_host_class(); |
2744 | mmc_unregister_bus(); | |
2745 | destroy_workqueue(workqueue); | |
2746 | } | |
2747 | ||
26074962 | 2748 | subsys_initcall(mmc_init); |
ffce2e7e PO |
2749 | module_exit(mmc_exit); |
2750 | ||
1da177e4 | 2751 | MODULE_LICENSE("GPL"); |