2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
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.
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>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/pm_wakeup.h>
27 #include <linux/suspend.h>
28 #include <linux/fault-inject.h>
29 #include <linux/random.h>
30 #include <linux/slab.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/mmc.h>
36 #include <linux/mmc/sd.h>
47 /* If the device is not responding */
48 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
51 * Background operations can take a long time, depending on the housekeeping
52 * operations the card has to perform.
54 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
56 static struct workqueue_struct *workqueue;
57 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
60 * Enabling software CRCs on the data blocks can be a significant (30%)
61 * performance cost, and for other reasons may not always be desired.
62 * So we allow it it to be disabled.
65 module_param(use_spi_crc, bool, 0);
68 * We normally treat cards as removed during suspend if they are not
69 * known to be on a non-removable bus, to avoid the risk of writing
70 * back data to a different card after resume. Allow this to be
71 * overridden if necessary.
73 #ifdef CONFIG_MMC_UNSAFE_RESUME
74 bool mmc_assume_removable;
76 bool mmc_assume_removable = 1;
78 EXPORT_SYMBOL(mmc_assume_removable);
79 module_param_named(removable, mmc_assume_removable, bool, 0644);
82 "MMC/SD cards are removable and may be removed during suspend");
85 * Internal function. Schedule delayed work in the MMC work queue.
87 static int mmc_schedule_delayed_work(struct delayed_work *work,
90 return queue_delayed_work(workqueue, work, delay);
94 * Internal function. Flush all scheduled work from the MMC work queue.
96 static void mmc_flush_scheduled_work(void)
98 flush_workqueue(workqueue);
101 #ifdef CONFIG_FAIL_MMC_REQUEST
104 * Internal function. Inject random data errors.
105 * If mmc_data is NULL no errors are injected.
107 static void mmc_should_fail_request(struct mmc_host *host,
108 struct mmc_request *mrq)
110 struct mmc_command *cmd = mrq->cmd;
111 struct mmc_data *data = mrq->data;
112 static const int data_errors[] = {
121 if (cmd->error || data->error ||
122 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
125 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
126 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
129 #else /* CONFIG_FAIL_MMC_REQUEST */
131 static inline void mmc_should_fail_request(struct mmc_host *host,
132 struct mmc_request *mrq)
136 #endif /* CONFIG_FAIL_MMC_REQUEST */
139 * mmc_request_done - finish processing an MMC request
140 * @host: MMC host which completed request
141 * @mrq: MMC request which request
143 * MMC drivers should call this function when they have completed
144 * their processing of a request.
146 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
148 struct mmc_command *cmd = mrq->cmd;
149 int err = cmd->error;
151 if (err && cmd->retries && mmc_host_is_spi(host)) {
152 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
156 if (err && cmd->retries && !mmc_card_removed(host->card)) {
158 * Request starter must handle retries - see
159 * mmc_wait_for_req_done().
164 mmc_should_fail_request(host, mrq);
166 led_trigger_event(host->led, LED_OFF);
168 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
169 mmc_hostname(host), cmd->opcode, err,
170 cmd->resp[0], cmd->resp[1],
171 cmd->resp[2], cmd->resp[3]);
174 pr_debug("%s: %d bytes transferred: %d\n",
176 mrq->data->bytes_xfered, mrq->data->error);
180 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
181 mmc_hostname(host), mrq->stop->opcode,
183 mrq->stop->resp[0], mrq->stop->resp[1],
184 mrq->stop->resp[2], mrq->stop->resp[3]);
190 mmc_host_clk_release(host);
194 EXPORT_SYMBOL(mmc_request_done);
197 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
199 #ifdef CONFIG_MMC_DEBUG
201 struct scatterlist *sg;
205 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
206 mmc_hostname(host), mrq->sbc->opcode,
207 mrq->sbc->arg, mrq->sbc->flags);
210 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
211 mmc_hostname(host), mrq->cmd->opcode,
212 mrq->cmd->arg, mrq->cmd->flags);
215 pr_debug("%s: blksz %d blocks %d flags %08x "
216 "tsac %d ms nsac %d\n",
217 mmc_hostname(host), mrq->data->blksz,
218 mrq->data->blocks, mrq->data->flags,
219 mrq->data->timeout_ns / 1000000,
220 mrq->data->timeout_clks);
224 pr_debug("%s: CMD%u arg %08x flags %08x\n",
225 mmc_hostname(host), mrq->stop->opcode,
226 mrq->stop->arg, mrq->stop->flags);
229 WARN_ON(!host->claimed);
234 BUG_ON(mrq->data->blksz > host->max_blk_size);
235 BUG_ON(mrq->data->blocks > host->max_blk_count);
236 BUG_ON(mrq->data->blocks * mrq->data->blksz >
239 #ifdef CONFIG_MMC_DEBUG
241 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
243 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
246 mrq->cmd->data = mrq->data;
247 mrq->data->error = 0;
248 mrq->data->mrq = mrq;
250 mrq->data->stop = mrq->stop;
251 mrq->stop->error = 0;
252 mrq->stop->mrq = mrq;
255 mmc_host_clk_hold(host);
256 led_trigger_event(host->led, LED_FULL);
257 host->ops->request(host, mrq);
261 * mmc_start_bkops - start BKOPS for supported cards
262 * @card: MMC card to start BKOPS
263 * @form_exception: A flag to indicate if this function was
264 * called due to an exception raised by the card
266 * Start background operations whenever requested.
267 * When the urgent BKOPS bit is set in a R1 command response
268 * then background operations should be started immediately.
270 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
274 bool use_busy_signal;
278 if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))
281 err = mmc_read_bkops_status(card);
283 pr_err("%s: Failed to read bkops status: %d\n",
284 mmc_hostname(card->host), err);
288 if (!card->ext_csd.raw_bkops_status)
291 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
295 mmc_claim_host(card->host);
296 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
297 timeout = MMC_BKOPS_MAX_TIMEOUT;
298 use_busy_signal = true;
301 use_busy_signal = false;
304 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
305 EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal, true);
307 pr_warn("%s: Error %d starting bkops\n",
308 mmc_hostname(card->host), err);
313 * For urgent bkops status (LEVEL_2 and more)
314 * bkops executed synchronously, otherwise
315 * the operation is in progress
317 if (!use_busy_signal)
318 mmc_card_set_doing_bkops(card);
320 mmc_release_host(card->host);
322 EXPORT_SYMBOL(mmc_start_bkops);
325 * mmc_wait_data_done() - done callback for data request
326 * @mrq: done data request
328 * Wakes up mmc context, passed as a callback to host controller driver
330 static void mmc_wait_data_done(struct mmc_request *mrq)
332 struct mmc_context_info *context_info = &mrq->host->context_info;
334 context_info->is_done_rcv = true;
335 wake_up_interruptible(&context_info->wait);
338 static void mmc_wait_done(struct mmc_request *mrq)
340 complete(&mrq->completion);
344 *__mmc_start_data_req() - starts data request
345 * @host: MMC host to start the request
346 * @mrq: data request to start
348 * Sets the done callback to be called when request is completed by the card.
349 * Starts data mmc request execution
351 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
353 mrq->done = mmc_wait_data_done;
355 if (mmc_card_removed(host->card)) {
356 mrq->cmd->error = -ENOMEDIUM;
357 mmc_wait_data_done(mrq);
360 mmc_start_request(host, mrq);
365 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
367 init_completion(&mrq->completion);
368 mrq->done = mmc_wait_done;
369 if (mmc_card_removed(host->card)) {
370 mrq->cmd->error = -ENOMEDIUM;
371 complete(&mrq->completion);
374 mmc_start_request(host, mrq);
379 * mmc_wait_for_data_req_done() - wait for request completed
380 * @host: MMC host to prepare the command.
381 * @mrq: MMC request to wait for
383 * Blocks MMC context till host controller will ack end of data request
384 * execution or new request notification arrives from the block layer.
385 * Handles command retries.
387 * Returns enum mmc_blk_status after checking errors.
389 static int mmc_wait_for_data_req_done(struct mmc_host *host,
390 struct mmc_request *mrq,
391 struct mmc_async_req *next_req)
393 struct mmc_command *cmd;
394 struct mmc_context_info *context_info = &host->context_info;
399 wait_event_interruptible(context_info->wait,
400 (context_info->is_done_rcv ||
401 context_info->is_new_req));
402 spin_lock_irqsave(&context_info->lock, flags);
403 context_info->is_waiting_last_req = false;
404 spin_unlock_irqrestore(&context_info->lock, flags);
405 if (context_info->is_done_rcv) {
406 context_info->is_done_rcv = false;
407 context_info->is_new_req = false;
410 if (!cmd->error || !cmd->retries ||
411 mmc_card_removed(host->card)) {
412 err = host->areq->err_check(host->card,
414 break; /* return err */
416 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
418 cmd->opcode, cmd->error);
421 host->ops->request(host, mrq);
422 continue; /* wait for done/new event again */
424 } else if (context_info->is_new_req) {
425 context_info->is_new_req = false;
427 err = MMC_BLK_NEW_REQUEST;
428 break; /* return err */
435 static void mmc_wait_for_req_done(struct mmc_host *host,
436 struct mmc_request *mrq)
438 struct mmc_command *cmd;
441 if (!mrq->cmd->data) {
442 if (mrq->cmd->opcode == MMC_ERASE ||
443 (mrq->cmd->opcode == MMC_ERASE_GROUP_START) ||
444 (mrq->cmd->opcode == MMC_ERASE_GROUP_END) ||
445 (mrq->cmd->opcode == MMC_SEND_STATUS))
450 timeout = mrq->cmd->data->blocks *
451 mrq->cmd->data->blksz * 500;
453 timeout = timeout ? timeout : 1000;
459 if (!wait_for_completion_timeout(&mrq->completion,
460 msecs_to_jiffies(timeout))) {
462 cmd->error = -ETIMEDOUT;
463 host->ops->post_tmo(host);
464 dev_err(mmc_dev(host),
465 "req failed (CMD%u): error = %d, timeout = %dms\n",
466 cmd->opcode, cmd->error, timeout);
474 * If host has timed out waiting for the sanitize
475 * to complete, card might be still in programming state
476 * so let's try to bring the card out of programming
479 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
480 if (!mmc_interrupt_hpi(host->card)) {
481 pr_warning("%s: %s: Interrupted sanitize\n",
482 mmc_hostname(host), __func__);
486 pr_err("%s: %s: Failed to interrupt sanitize\n",
487 mmc_hostname(host), __func__);
490 if (!cmd->error || !cmd->retries ||
491 mmc_card_removed(host->card))
494 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
495 mmc_hostname(host), cmd->opcode, cmd->error);
498 host->ops->request(host, mrq);
503 * mmc_pre_req - Prepare for a new request
504 * @host: MMC host to prepare command
505 * @mrq: MMC request to prepare for
506 * @is_first_req: true if there is no previous started request
507 * that may run in parellel to this call, otherwise false
509 * mmc_pre_req() is called in prior to mmc_start_req() to let
510 * host prepare for the new request. Preparation of a request may be
511 * performed while another request is running on the host.
513 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
516 if (host->ops->pre_req) {
517 mmc_host_clk_hold(host);
518 host->ops->pre_req(host, mrq, is_first_req);
519 mmc_host_clk_release(host);
524 * mmc_post_req - Post process a completed request
525 * @host: MMC host to post process command
526 * @mrq: MMC request to post process for
527 * @err: Error, if non zero, clean up any resources made in pre_req
529 * Let the host post process a completed request. Post processing of
530 * a request may be performed while another reuqest is running.
532 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
535 if (host->ops->post_req) {
536 mmc_host_clk_hold(host);
537 host->ops->post_req(host, mrq, err);
538 mmc_host_clk_release(host);
543 * mmc_start_req - start a non-blocking request
544 * @host: MMC host to start command
545 * @areq: async request to start
546 * @error: out parameter returns 0 for success, otherwise non zero
548 * Start a new MMC custom command request for a host.
549 * If there is on ongoing async request wait for completion
550 * of that request and start the new one and return.
551 * Does not wait for the new request to complete.
553 * Returns the completed request, NULL in case of none completed.
554 * Wait for the an ongoing request (previoulsy started) to complete and
555 * return the completed request. If there is no ongoing request, NULL
556 * is returned without waiting. NULL is not an error condition.
558 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
559 struct mmc_async_req *areq, int *error)
563 struct mmc_async_req *data = host->areq;
565 /* Prepare a new request */
567 mmc_pre_req(host, areq->mrq, !host->areq);
570 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
571 if (err == MMC_BLK_NEW_REQUEST) {
575 * The previous request was not completed,
581 * Check BKOPS urgency for each R1 response
583 if (host->card && mmc_card_mmc(host->card) &&
584 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
585 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
586 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
587 mmc_start_bkops(host->card, true);
591 start_err = __mmc_start_data_req(host, areq->mrq);
595 mmc_post_req(host, host->areq->mrq, 0);
597 /* Cancel a prepared request if it was not started. */
598 if ((err || start_err) && areq)
599 mmc_post_req(host, areq->mrq, -EINVAL);
610 EXPORT_SYMBOL(mmc_start_req);
613 * mmc_wait_for_req - start a request and wait for completion
614 * @host: MMC host to start command
615 * @mrq: MMC request to start
617 * Start a new MMC custom command request for a host, and wait
618 * for the command to complete. Does not attempt to parse the
621 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
623 __mmc_start_req(host, mrq);
624 mmc_wait_for_req_done(host, mrq);
626 EXPORT_SYMBOL(mmc_wait_for_req);
629 * mmc_interrupt_hpi - Issue for High priority Interrupt
630 * @card: the MMC card associated with the HPI transfer
632 * Issued High Priority Interrupt, and check for card status
633 * until out-of prg-state.
635 int mmc_interrupt_hpi(struct mmc_card *card)
639 unsigned long prg_wait;
643 if (!card->ext_csd.hpi_en) {
644 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
648 mmc_claim_host(card->host);
649 err = mmc_send_status(card, &status);
651 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
655 switch (R1_CURRENT_STATE(status)) {
661 * In idle and transfer states, HPI is not needed and the caller
662 * can issue the next intended command immediately
668 /* In all other states, it's illegal to issue HPI */
669 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
670 mmc_hostname(card->host), R1_CURRENT_STATE(status));
675 err = mmc_send_hpi_cmd(card, &status);
679 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
681 err = mmc_send_status(card, &status);
683 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
685 if (time_after(jiffies, prg_wait))
690 mmc_release_host(card->host);
693 EXPORT_SYMBOL(mmc_interrupt_hpi);
696 * mmc_wait_for_cmd - start a command and wait for completion
697 * @host: MMC host to start command
698 * @cmd: MMC command to start
699 * @retries: maximum number of retries
701 * Start a new MMC command for a host, and wait for the command
702 * to complete. Return any error that occurred while the command
703 * was executing. Do not attempt to parse the response.
705 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
707 struct mmc_request mrq = {NULL};
709 WARN_ON(!host->claimed);
711 memset(cmd->resp, 0, sizeof(cmd->resp));
712 cmd->retries = retries;
717 mmc_wait_for_req(host, &mrq);
722 EXPORT_SYMBOL(mmc_wait_for_cmd);
725 * mmc_stop_bkops - stop ongoing BKOPS
726 * @card: MMC card to check BKOPS
728 * Send HPI command to stop ongoing background operations to
729 * allow rapid servicing of foreground operations, e.g. read/
730 * writes. Wait until the card comes out of the programming state
731 * to avoid errors in servicing read/write requests.
733 int mmc_stop_bkops(struct mmc_card *card)
738 err = mmc_interrupt_hpi(card);
741 * If err is EINVAL, we can't issue an HPI.
742 * It should complete the BKOPS.
744 if (!err || (err == -EINVAL)) {
745 mmc_card_clr_doing_bkops(card);
751 EXPORT_SYMBOL(mmc_stop_bkops);
753 int mmc_read_bkops_status(struct mmc_card *card)
759 * In future work, we should consider storing the entire ext_csd.
761 ext_csd = kmalloc(512, GFP_KERNEL);
763 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
764 mmc_hostname(card->host));
768 mmc_claim_host(card->host);
769 err = mmc_send_ext_csd(card, ext_csd);
770 mmc_release_host(card->host);
774 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
775 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
780 EXPORT_SYMBOL(mmc_read_bkops_status);
783 * mmc_set_data_timeout - set the timeout for a data command
784 * @data: data phase for command
785 * @card: the MMC card associated with the data transfer
787 * Computes the data timeout parameters according to the
788 * correct algorithm given the card type.
790 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
795 * SDIO cards only define an upper 1 s limit on access.
797 if (mmc_card_sdio(card)) {
798 data->timeout_ns = 1000000000;
799 data->timeout_clks = 0;
804 * SD cards use a 100 multiplier rather than 10
806 mult = mmc_card_sd(card) ? 100 : 10;
809 * Scale up the multiplier (and therefore the timeout) by
810 * the r2w factor for writes.
812 if (data->flags & MMC_DATA_WRITE)
813 mult <<= card->csd.r2w_factor;
815 data->timeout_ns = card->csd.tacc_ns * mult;
816 data->timeout_clks = card->csd.tacc_clks * mult;
819 * SD cards also have an upper limit on the timeout.
821 if (mmc_card_sd(card)) {
822 unsigned int timeout_us, limit_us;
824 timeout_us = data->timeout_ns / 1000;
825 if (mmc_host_clk_rate(card->host))
826 timeout_us += data->timeout_clks * 1000 /
827 (mmc_host_clk_rate(card->host) / 1000);
829 if (data->flags & MMC_DATA_WRITE)
831 * The MMC spec "It is strongly recommended
832 * for hosts to implement more than 500ms
833 * timeout value even if the card indicates
834 * the 250ms maximum busy length." Even the
835 * previous value of 300ms is known to be
836 * insufficient for some cards.
843 * SDHC cards always use these fixed values.
845 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
846 data->timeout_ns = limit_us * 1000;
847 data->timeout_clks = 0;
852 * Some cards require longer data read timeout than indicated in CSD.
853 * Address this by setting the read timeout to a "reasonably high"
854 * value. For the cards tested, 300ms has proven enough. If necessary,
855 * this value can be increased if other problematic cards require this.
857 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
858 data->timeout_ns = 300000000;
859 data->timeout_clks = 0;
863 * Some cards need very high timeouts if driven in SPI mode.
864 * The worst observed timeout was 900ms after writing a
865 * continuous stream of data until the internal logic
868 if (mmc_host_is_spi(card->host)) {
869 if (data->flags & MMC_DATA_WRITE) {
870 if (data->timeout_ns < 1000000000)
871 data->timeout_ns = 1000000000; /* 1s */
873 if (data->timeout_ns < 100000000)
874 data->timeout_ns = 100000000; /* 100ms */
878 EXPORT_SYMBOL(mmc_set_data_timeout);
881 * mmc_align_data_size - pads a transfer size to a more optimal value
882 * @card: the MMC card associated with the data transfer
883 * @sz: original transfer size
885 * Pads the original data size with a number of extra bytes in
886 * order to avoid controller bugs and/or performance hits
887 * (e.g. some controllers revert to PIO for certain sizes).
889 * Returns the improved size, which might be unmodified.
891 * Note that this function is only relevant when issuing a
892 * single scatter gather entry.
894 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
897 * FIXME: We don't have a system for the controller to tell
898 * the core about its problems yet, so for now we just 32-bit
901 sz = ((sz + 3) / 4) * 4;
905 EXPORT_SYMBOL(mmc_align_data_size);
908 * __mmc_claim_host - exclusively claim a host
909 * @host: mmc host to claim
910 * @abort: whether or not the operation should be aborted
912 * Claim a host for a set of operations. If @abort is non null and
913 * dereference a non-zero value then this will return prematurely with
914 * that non-zero value without acquiring the lock. Returns zero
915 * with the lock held otherwise.
917 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
919 DECLARE_WAITQUEUE(wait, current);
925 add_wait_queue(&host->wq, &wait);
926 spin_lock_irqsave(&host->lock, flags);
928 set_current_state(TASK_UNINTERRUPTIBLE);
929 stop = abort ? atomic_read(abort) : 0;
930 if (stop || !host->claimed || host->claimer == current)
932 spin_unlock_irqrestore(&host->lock, flags);
934 spin_lock_irqsave(&host->lock, flags);
936 set_current_state(TASK_RUNNING);
939 host->claimer = current;
940 host->claim_cnt += 1;
943 spin_unlock_irqrestore(&host->lock, flags);
944 remove_wait_queue(&host->wq, &wait);
945 if (host->ops->enable && !stop && host->claim_cnt == 1)
946 host->ops->enable(host);
950 EXPORT_SYMBOL(__mmc_claim_host);
953 * mmc_release_host - release a host
954 * @host: mmc host to release
956 * Release a MMC host, allowing others to claim the host
957 * for their operations.
959 void mmc_release_host(struct mmc_host *host)
963 WARN_ON(!host->claimed);
965 if (host->ops->disable && host->claim_cnt == 1)
966 host->ops->disable(host);
968 spin_lock_irqsave(&host->lock, flags);
969 if (--host->claim_cnt) {
970 /* Release for nested claim */
971 spin_unlock_irqrestore(&host->lock, flags);
974 host->claimer = NULL;
975 spin_unlock_irqrestore(&host->lock, flags);
979 EXPORT_SYMBOL(mmc_release_host);
982 * This is a helper function, which fetches a runtime pm reference for the
983 * card device and also claims the host.
985 void mmc_get_card(struct mmc_card *card)
987 pm_runtime_get_sync(&card->dev);
988 mmc_claim_host(card->host);
990 EXPORT_SYMBOL(mmc_get_card);
993 * This is a helper function, which releases the host and drops the runtime
994 * pm reference for the card device.
996 void mmc_put_card(struct mmc_card *card)
998 mmc_release_host(card->host);
999 pm_runtime_mark_last_busy(&card->dev);
1000 pm_runtime_put_autosuspend(&card->dev);
1002 EXPORT_SYMBOL(mmc_put_card);
1005 * Internal function that does the actual ios call to the host driver,
1006 * optionally printing some debug output.
1008 static inline void mmc_set_ios(struct mmc_host *host)
1010 struct mmc_ios *ios = &host->ios;
1012 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1013 "width %u timing %u\n",
1014 mmc_hostname(host), ios->clock, ios->bus_mode,
1015 ios->power_mode, ios->chip_select, ios->vdd,
1016 ios->bus_width, ios->timing);
1019 mmc_set_ungated(host);
1020 host->ops->set_ios(host, ios);
1024 * Control chip select pin on a host.
1026 void mmc_set_chip_select(struct mmc_host *host, int mode)
1028 mmc_host_clk_hold(host);
1029 host->ios.chip_select = mode;
1031 mmc_host_clk_release(host);
1035 * Sets the host clock to the highest possible frequency that
1038 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
1040 WARN_ON(hz < host->f_min);
1042 if (hz > host->f_max)
1045 host->ios.clock = hz;
1049 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1051 mmc_host_clk_hold(host);
1052 __mmc_set_clock(host, hz);
1053 mmc_host_clk_release(host);
1056 #ifdef CONFIG_MMC_CLKGATE
1058 * This gates the clock by setting it to 0 Hz.
1060 void mmc_gate_clock(struct mmc_host *host)
1062 unsigned long flags;
1064 spin_lock_irqsave(&host->clk_lock, flags);
1065 host->clk_old = host->ios.clock;
1066 host->ios.clock = 0;
1067 host->clk_gated = true;
1068 spin_unlock_irqrestore(&host->clk_lock, flags);
1073 * This restores the clock from gating by using the cached
1076 void mmc_ungate_clock(struct mmc_host *host)
1079 * We should previously have gated the clock, so the clock shall
1080 * be 0 here! The clock may however be 0 during initialization,
1081 * when some request operations are performed before setting
1082 * the frequency. When ungate is requested in that situation
1083 * we just ignore the call.
1085 if (host->clk_old) {
1086 BUG_ON(host->ios.clock);
1087 /* This call will also set host->clk_gated to false */
1088 __mmc_set_clock(host, host->clk_old);
1092 void mmc_set_ungated(struct mmc_host *host)
1094 unsigned long flags;
1097 * We've been given a new frequency while the clock is gated,
1098 * so make sure we regard this as ungating it.
1100 spin_lock_irqsave(&host->clk_lock, flags);
1101 host->clk_gated = false;
1102 spin_unlock_irqrestore(&host->clk_lock, flags);
1106 void mmc_set_ungated(struct mmc_host *host)
1112 * Change the bus mode (open drain/push-pull) of a host.
1114 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1116 mmc_host_clk_hold(host);
1117 host->ios.bus_mode = mode;
1119 mmc_host_clk_release(host);
1123 * Change data bus width of a host.
1125 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1127 mmc_host_clk_hold(host);
1128 host->ios.bus_width = width;
1130 mmc_host_clk_release(host);
1134 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1135 * @vdd: voltage (mV)
1136 * @low_bits: prefer low bits in boundary cases
1138 * This function returns the OCR bit number according to the provided @vdd
1139 * value. If conversion is not possible a negative errno value returned.
1141 * Depending on the @low_bits flag the function prefers low or high OCR bits
1142 * on boundary voltages. For example,
1143 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1144 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1146 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1148 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1150 const int max_bit = ilog2(MMC_VDD_35_36);
1153 if (vdd < 1650 || vdd > 3600)
1156 if (vdd >= 1650 && vdd <= 1950)
1157 return ilog2(MMC_VDD_165_195);
1162 /* Base 2000 mV, step 100 mV, bit's base 8. */
1163 bit = (vdd - 2000) / 100 + 8;
1170 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1171 * @vdd_min: minimum voltage value (mV)
1172 * @vdd_max: maximum voltage value (mV)
1174 * This function returns the OCR mask bits according to the provided @vdd_min
1175 * and @vdd_max values. If conversion is not possible the function returns 0.
1177 * Notes wrt boundary cases:
1178 * This function sets the OCR bits for all boundary voltages, for example
1179 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1180 * MMC_VDD_34_35 mask.
1182 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1186 if (vdd_max < vdd_min)
1189 /* Prefer high bits for the boundary vdd_max values. */
1190 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1194 /* Prefer low bits for the boundary vdd_min values. */
1195 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1199 /* Fill the mask, from max bit to min bit. */
1200 while (vdd_max >= vdd_min)
1201 mask |= 1 << vdd_max--;
1205 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1210 * mmc_of_parse_voltage - return mask of supported voltages
1211 * @np: The device node need to be parsed.
1212 * @mask: mask of voltages available for MMC/SD/SDIO
1214 * 1. Return zero on success.
1215 * 2. Return negative errno: voltage-range is invalid.
1217 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1219 const u32 *voltage_ranges;
1222 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1223 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1224 if (!voltage_ranges || !num_ranges) {
1225 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1229 for (i = 0; i < num_ranges; i++) {
1230 const int j = i * 2;
1233 ocr_mask = mmc_vddrange_to_ocrmask(
1234 be32_to_cpu(voltage_ranges[j]),
1235 be32_to_cpu(voltage_ranges[j + 1]));
1237 pr_err("%s: voltage-range #%d is invalid\n",
1246 EXPORT_SYMBOL(mmc_of_parse_voltage);
1248 #endif /* CONFIG_OF */
1250 #ifdef CONFIG_REGULATOR
1253 * mmc_regulator_get_ocrmask - return mask of supported voltages
1254 * @supply: regulator to use
1256 * This returns either a negative errno, or a mask of voltages that
1257 * can be provided to MMC/SD/SDIO devices using the specified voltage
1258 * regulator. This would normally be called before registering the
1261 int mmc_regulator_get_ocrmask(struct regulator *supply)
1267 count = regulator_count_voltages(supply);
1271 for (i = 0; i < count; i++) {
1275 vdd_uV = regulator_list_voltage(supply, i);
1279 vdd_mV = vdd_uV / 1000;
1280 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1285 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1288 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1289 * @mmc: the host to regulate
1290 * @supply: regulator to use
1291 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1293 * Returns zero on success, else negative errno.
1295 * MMC host drivers may use this to enable or disable a regulator using
1296 * a particular supply voltage. This would normally be called from the
1299 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1300 struct regulator *supply,
1301 unsigned short vdd_bit)
1311 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1312 * bits this regulator doesn't quite support ... don't
1313 * be too picky, most cards and regulators are OK with
1314 * a 0.1V range goof (it's a small error percentage).
1316 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1318 min_uV = 1650 * 1000;
1319 max_uV = 1950 * 1000;
1321 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1322 max_uV = min_uV + 100 * 1000;
1326 * If we're using a fixed/static regulator, don't call
1327 * regulator_set_voltage; it would fail.
1329 voltage = regulator_get_voltage(supply);
1331 if (!regulator_can_change_voltage(supply))
1332 min_uV = max_uV = voltage;
1336 else if (voltage < min_uV || voltage > max_uV)
1337 result = regulator_set_voltage(supply, min_uV, max_uV);
1341 if (result == 0 && !mmc->regulator_enabled) {
1342 result = regulator_enable(supply);
1344 mmc->regulator_enabled = true;
1346 } else if (mmc->regulator_enabled) {
1347 result = regulator_disable(supply);
1349 mmc->regulator_enabled = false;
1353 dev_err(mmc_dev(mmc),
1354 "could not set regulator OCR (%d)\n", result);
1357 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1359 int mmc_regulator_get_supply(struct mmc_host *mmc)
1361 struct device *dev = mmc_dev(mmc);
1362 struct regulator *supply;
1365 supply = devm_regulator_get(dev, "vmmc");
1366 mmc->supply.vmmc = supply;
1367 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1370 return PTR_ERR(supply);
1372 ret = mmc_regulator_get_ocrmask(supply);
1374 mmc->ocr_avail = ret;
1376 dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
1380 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1382 #endif /* CONFIG_REGULATOR */
1385 * Mask off any voltages we don't support and select
1386 * the lowest voltage
1388 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1393 * Sanity check the voltages that the card claims to
1397 dev_warn(mmc_dev(host),
1398 "card claims to support voltages below defined range\n");
1402 ocr &= host->ocr_avail;
1404 dev_warn(mmc_dev(host), "no support for card's volts\n");
1408 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1411 mmc_power_cycle(host, ocr);
1415 if (bit != host->ios.vdd)
1416 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1422 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1425 int old_signal_voltage = host->ios.signal_voltage;
1427 host->ios.signal_voltage = signal_voltage;
1428 if (host->ops->start_signal_voltage_switch) {
1429 mmc_host_clk_hold(host);
1430 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1431 mmc_host_clk_release(host);
1435 host->ios.signal_voltage = old_signal_voltage;
1441 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1443 struct mmc_command cmd = {0};
1450 * Send CMD11 only if the request is to switch the card to
1453 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1454 return __mmc_set_signal_voltage(host, signal_voltage);
1457 * If we cannot switch voltages, return failure so the caller
1458 * can continue without UHS mode
1460 if (!host->ops->start_signal_voltage_switch)
1462 if (!host->ops->card_busy)
1463 pr_warning("%s: cannot verify signal voltage switch\n",
1464 mmc_hostname(host));
1466 cmd.opcode = SD_SWITCH_VOLTAGE;
1468 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1470 err = mmc_wait_for_cmd(host, &cmd, 0);
1474 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1477 mmc_host_clk_hold(host);
1479 * The card should drive cmd and dat[0:3] low immediately
1480 * after the response of cmd11, but wait 1 ms to be sure
1483 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1488 * During a signal voltage level switch, the clock must be gated
1489 * for 5 ms according to the SD spec
1491 clock = host->ios.clock;
1492 host->ios.clock = 0;
1495 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1497 * Voltages may not have been switched, but we've already
1498 * sent CMD11, so a power cycle is required anyway
1504 /* Keep clock gated for at least 5 ms */
1506 host->ios.clock = clock;
1509 /* Wait for at least 1 ms according to spec */
1513 * Failure to switch is indicated by the card holding
1516 if (host->ops->card_busy && host->ops->card_busy(host))
1521 pr_debug("%s: Signal voltage switch failed, "
1522 "power cycling card\n", mmc_hostname(host));
1523 mmc_power_cycle(host, ocr);
1526 mmc_host_clk_release(host);
1532 * Select timing parameters for host.
1534 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1536 mmc_host_clk_hold(host);
1537 host->ios.timing = timing;
1539 mmc_host_clk_release(host);
1543 * Select appropriate driver type for host.
1545 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1547 mmc_host_clk_hold(host);
1548 host->ios.drv_type = drv_type;
1550 mmc_host_clk_release(host);
1554 * Apply power to the MMC stack. This is a two-stage process.
1555 * First, we enable power to the card without the clock running.
1556 * We then wait a bit for the power to stabilise. Finally,
1557 * enable the bus drivers and clock to the card.
1559 * We must _NOT_ enable the clock prior to power stablising.
1561 * If a host does all the power sequencing itself, ignore the
1562 * initial MMC_POWER_UP stage.
1564 void mmc_power_up(struct mmc_host *host, u32 ocr)
1566 if (host->ios.power_mode == MMC_POWER_ON)
1569 mmc_host_clk_hold(host);
1571 host->ios.vdd = fls(ocr) - 1;
1572 if (mmc_host_is_spi(host))
1573 host->ios.chip_select = MMC_CS_HIGH;
1575 host->ios.chip_select = MMC_CS_DONTCARE;
1576 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1577 host->ios.power_mode = MMC_POWER_UP;
1578 host->ios.bus_width = MMC_BUS_WIDTH_1;
1579 host->ios.timing = MMC_TIMING_LEGACY;
1582 /* Set signal voltage to 3.3V */
1583 __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1586 * This delay should be sufficient to allow the power supply
1587 * to reach the minimum voltage.
1591 host->ios.clock = host->f_init;
1593 host->ios.power_mode = MMC_POWER_ON;
1597 * This delay must be at least 74 clock sizes, or 1 ms, or the
1598 * time required to reach a stable voltage.
1602 mmc_host_clk_release(host);
1605 void mmc_power_off(struct mmc_host *host)
1607 if (host->ios.power_mode == MMC_POWER_OFF)
1610 mmc_host_clk_hold(host);
1612 host->ios.clock = 0;
1615 if (!mmc_host_is_spi(host)) {
1616 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1617 host->ios.chip_select = MMC_CS_DONTCARE;
1619 host->ios.power_mode = MMC_POWER_OFF;
1620 host->ios.bus_width = MMC_BUS_WIDTH_1;
1621 host->ios.timing = MMC_TIMING_LEGACY;
1625 * Some configurations, such as the 802.11 SDIO card in the OLPC
1626 * XO-1.5, require a short delay after poweroff before the card
1627 * can be successfully turned on again.
1631 mmc_host_clk_release(host);
1634 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1636 mmc_power_off(host);
1637 /* Wait at least 1 ms according to SD spec */
1639 mmc_power_up(host, ocr);
1643 * Cleanup when the last reference to the bus operator is dropped.
1645 static void __mmc_release_bus(struct mmc_host *host)
1648 BUG_ON(host->bus_refs);
1649 BUG_ON(!host->bus_dead);
1651 host->bus_ops = NULL;
1655 * Increase reference count of bus operator
1657 static inline void mmc_bus_get(struct mmc_host *host)
1659 unsigned long flags;
1661 spin_lock_irqsave(&host->lock, flags);
1663 spin_unlock_irqrestore(&host->lock, flags);
1667 * Decrease reference count of bus operator and free it if
1668 * it is the last reference.
1670 static inline void mmc_bus_put(struct mmc_host *host)
1672 unsigned long flags;
1674 spin_lock_irqsave(&host->lock, flags);
1676 if ((host->bus_refs == 0) && host->bus_ops)
1677 __mmc_release_bus(host);
1678 spin_unlock_irqrestore(&host->lock, flags);
1682 int mmc_resume_bus(struct mmc_host *host)
1684 unsigned long flags;
1686 if (!mmc_bus_needs_resume(host))
1689 printk("%s: Starting deferred resume\n", mmc_hostname(host));
1690 spin_lock_irqsave(&host->lock, flags);
1691 host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME;
1692 host->rescan_disable = 0;
1693 spin_unlock_irqrestore(&host->lock, flags);
1696 if (host->bus_ops && !host->bus_dead) {
1698 BUG_ON(!host->bus_ops->resume);
1699 host->bus_ops->resume(host);
1702 if (host->bus_ops->detect && !host->bus_dead)
1703 host->bus_ops->detect(host);
1706 printk("%s: Deferred resume completed\n", mmc_hostname(host));
1710 EXPORT_SYMBOL(mmc_resume_bus);
1714 * Assign a mmc bus handler to a host. Only one bus handler may control a
1715 * host at any given time.
1717 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1719 unsigned long flags;
1724 WARN_ON(!host->claimed);
1726 spin_lock_irqsave(&host->lock, flags);
1728 BUG_ON(host->bus_ops);
1729 BUG_ON(host->bus_refs);
1731 host->bus_ops = ops;
1735 spin_unlock_irqrestore(&host->lock, flags);
1739 * Remove the current bus handler from a host.
1741 void mmc_detach_bus(struct mmc_host *host)
1743 unsigned long flags;
1747 WARN_ON(!host->claimed);
1748 WARN_ON(!host->bus_ops);
1750 spin_lock_irqsave(&host->lock, flags);
1754 spin_unlock_irqrestore(&host->lock, flags);
1759 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1762 #ifdef CONFIG_MMC_DEBUG
1763 unsigned long flags;
1764 spin_lock_irqsave(&host->lock, flags);
1765 WARN_ON(host->removed);
1766 spin_unlock_irqrestore(&host->lock, flags);
1770 * If the device is configured as wakeup, we prevent a new sleep for
1771 * 5 s to give provision for user space to consume the event.
1773 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1774 device_can_wakeup(mmc_dev(host)))
1775 pm_wakeup_event(mmc_dev(host), 5000);
1777 host->detect_change = 1;
1778 mmc_schedule_delayed_work(&host->detect, delay);
1782 * mmc_detect_change - process change of state on a MMC socket
1783 * @host: host which changed state.
1784 * @delay: optional delay to wait before detection (jiffies)
1786 * MMC drivers should call this when they detect a card has been
1787 * inserted or removed. The MMC layer will confirm that any
1788 * present card is still functional, and initialize any newly
1791 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1793 _mmc_detect_change(host, delay, true);
1795 EXPORT_SYMBOL(mmc_detect_change);
1797 void mmc_init_erase(struct mmc_card *card)
1801 if (is_power_of_2(card->erase_size))
1802 card->erase_shift = ffs(card->erase_size) - 1;
1804 card->erase_shift = 0;
1807 * It is possible to erase an arbitrarily large area of an SD or MMC
1808 * card. That is not desirable because it can take a long time
1809 * (minutes) potentially delaying more important I/O, and also the
1810 * timeout calculations become increasingly hugely over-estimated.
1811 * Consequently, 'pref_erase' is defined as a guide to limit erases
1812 * to that size and alignment.
1814 * For SD cards that define Allocation Unit size, limit erases to one
1815 * Allocation Unit at a time. For MMC cards that define High Capacity
1816 * Erase Size, whether it is switched on or not, limit to that size.
1817 * Otherwise just have a stab at a good value. For modern cards it
1818 * will end up being 4MiB. Note that if the value is too small, it
1819 * can end up taking longer to erase.
1821 if (mmc_card_sd(card) && card->ssr.au) {
1822 card->pref_erase = card->ssr.au;
1823 card->erase_shift = ffs(card->ssr.au) - 1;
1824 } else if (card->ext_csd.hc_erase_size) {
1825 card->pref_erase = card->ext_csd.hc_erase_size;
1827 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1829 card->pref_erase = 512 * 1024 / 512;
1831 card->pref_erase = 1024 * 1024 / 512;
1833 card->pref_erase = 2 * 1024 * 1024 / 512;
1835 card->pref_erase = 4 * 1024 * 1024 / 512;
1836 if (card->pref_erase < card->erase_size)
1837 card->pref_erase = card->erase_size;
1839 sz = card->pref_erase % card->erase_size;
1841 card->pref_erase += card->erase_size - sz;
1846 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1847 unsigned int arg, unsigned int qty)
1849 unsigned int erase_timeout;
1851 if (arg == MMC_DISCARD_ARG ||
1852 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1853 erase_timeout = card->ext_csd.trim_timeout;
1854 } else if (card->ext_csd.erase_group_def & 1) {
1855 /* High Capacity Erase Group Size uses HC timeouts */
1856 if (arg == MMC_TRIM_ARG)
1857 erase_timeout = card->ext_csd.trim_timeout;
1859 erase_timeout = card->ext_csd.hc_erase_timeout;
1861 /* CSD Erase Group Size uses write timeout */
1862 unsigned int mult = (10 << card->csd.r2w_factor);
1863 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1864 unsigned int timeout_us;
1866 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1867 if (card->csd.tacc_ns < 1000000)
1868 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1870 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1873 * ios.clock is only a target. The real clock rate might be
1874 * less but not that much less, so fudge it by multiplying by 2.
1877 timeout_us += (timeout_clks * 1000) /
1878 (mmc_host_clk_rate(card->host) / 1000);
1880 erase_timeout = timeout_us / 1000;
1883 * Theoretically, the calculation could underflow so round up
1884 * to 1ms in that case.
1890 /* Multiplier for secure operations */
1891 if (arg & MMC_SECURE_ARGS) {
1892 if (arg == MMC_SECURE_ERASE_ARG)
1893 erase_timeout *= card->ext_csd.sec_erase_mult;
1895 erase_timeout *= card->ext_csd.sec_trim_mult;
1898 erase_timeout *= qty;
1901 * Ensure at least a 1 second timeout for SPI as per
1902 * 'mmc_set_data_timeout()'
1904 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1905 erase_timeout = 1000;
1907 return erase_timeout;
1910 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1914 unsigned int erase_timeout;
1916 if (card->ssr.erase_timeout) {
1917 /* Erase timeout specified in SD Status Register (SSR) */
1918 erase_timeout = card->ssr.erase_timeout * qty +
1919 card->ssr.erase_offset;
1922 * Erase timeout not specified in SD Status Register (SSR) so
1923 * use 250ms per write block.
1925 erase_timeout = 250 * qty;
1928 /* Must not be less than 1 second */
1929 if (erase_timeout < 1000)
1930 erase_timeout = 1000;
1932 return erase_timeout;
1935 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1939 if (mmc_card_sd(card))
1940 return mmc_sd_erase_timeout(card, arg, qty);
1942 return mmc_mmc_erase_timeout(card, arg, qty);
1945 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1946 unsigned int to, unsigned int arg)
1948 struct mmc_command cmd = {0};
1949 unsigned int qty = 0;
1950 unsigned long timeout;
1951 unsigned int fr, nr;
1958 * qty is used to calculate the erase timeout which depends on how many
1959 * erase groups (or allocation units in SD terminology) are affected.
1960 * We count erasing part of an erase group as one erase group.
1961 * For SD, the allocation units are always a power of 2. For MMC, the
1962 * erase group size is almost certainly also power of 2, but it does not
1963 * seem to insist on that in the JEDEC standard, so we fall back to
1964 * division in that case. SD may not specify an allocation unit size,
1965 * in which case the timeout is based on the number of write blocks.
1967 * Note that the timeout for secure trim 2 will only be correct if the
1968 * number of erase groups specified is the same as the total of all
1969 * preceding secure trim 1 commands. Since the power may have been
1970 * lost since the secure trim 1 commands occurred, it is generally
1971 * impossible to calculate the secure trim 2 timeout correctly.
1973 if (card->erase_shift)
1974 qty += ((to >> card->erase_shift) -
1975 (from >> card->erase_shift)) + 1;
1976 else if (mmc_card_sd(card))
1977 qty += to - from + 1;
1979 qty += ((to / card->erase_size) -
1980 (from / card->erase_size)) + 1;
1982 if (!mmc_card_blockaddr(card)) {
1987 if (mmc_card_sd(card))
1988 cmd.opcode = SD_ERASE_WR_BLK_START;
1990 cmd.opcode = MMC_ERASE_GROUP_START;
1992 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1993 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1995 pr_err("mmc_erase: group start error %d, "
1996 "status %#x\n", err, cmd.resp[0]);
2001 memset(&cmd, 0, sizeof(struct mmc_command));
2002 if (mmc_card_sd(card))
2003 cmd.opcode = SD_ERASE_WR_BLK_END;
2005 cmd.opcode = MMC_ERASE_GROUP_END;
2007 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2008 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2010 pr_err("mmc_erase: group end error %d, status %#x\n",
2016 memset(&cmd, 0, sizeof(struct mmc_command));
2017 cmd.opcode = MMC_ERASE;
2019 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2020 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
2021 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2023 pr_err("mmc_erase: erase error %d, status %#x\n",
2029 if (mmc_host_is_spi(card->host))
2032 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2034 memset(&cmd, 0, sizeof(struct mmc_command));
2035 cmd.opcode = MMC_SEND_STATUS;
2036 cmd.arg = card->rca << 16;
2037 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2038 /* Do not retry else we can't see errors */
2039 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2040 if (err || (cmd.resp[0] & 0xFDF92000)) {
2041 pr_err("error %d requesting status %#x\n",
2047 /* Timeout if the device never becomes ready for data and
2048 * never leaves the program state.
2050 if (time_after(jiffies, timeout)) {
2051 pr_err("%s: Card stuck in programming state! %s\n",
2052 mmc_hostname(card->host), __func__);
2057 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2058 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2065 * mmc_erase - erase sectors.
2066 * @card: card to erase
2067 * @from: first sector to erase
2068 * @nr: number of sectors to erase
2069 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2071 * Caller must claim host before calling this function.
2073 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2076 unsigned int rem, to = from + nr;
2078 if (!(card->host->caps & MMC_CAP_ERASE) ||
2079 !(card->csd.cmdclass & CCC_ERASE))
2082 if (!card->erase_size)
2085 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2088 if ((arg & MMC_SECURE_ARGS) &&
2089 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2092 if ((arg & MMC_TRIM_ARGS) &&
2093 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2096 if (arg == MMC_SECURE_ERASE_ARG) {
2097 if (from % card->erase_size || nr % card->erase_size)
2101 if (arg == MMC_ERASE_ARG) {
2102 rem = from % card->erase_size;
2104 rem = card->erase_size - rem;
2111 rem = nr % card->erase_size;
2124 /* 'from' and 'to' are inclusive */
2127 return mmc_do_erase(card, from, to, arg);
2129 EXPORT_SYMBOL(mmc_erase);
2131 int mmc_can_erase(struct mmc_card *card)
2133 if ((card->host->caps & MMC_CAP_ERASE) &&
2134 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2138 EXPORT_SYMBOL(mmc_can_erase);
2140 int mmc_can_trim(struct mmc_card *card)
2142 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2143 !(card->quirks & MMC_QUIRK_TRIM_UNSTABLE))
2147 EXPORT_SYMBOL(mmc_can_trim);
2149 int mmc_can_discard(struct mmc_card *card)
2152 * As there's no way to detect the discard support bit at v4.5
2153 * use the s/w feature support filed.
2155 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2159 EXPORT_SYMBOL(mmc_can_discard);
2161 int mmc_can_sanitize(struct mmc_card *card)
2163 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2165 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2169 EXPORT_SYMBOL(mmc_can_sanitize);
2171 int mmc_can_secure_erase_trim(struct mmc_card *card)
2173 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
2177 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2179 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2182 if (!card->erase_size)
2184 if (from % card->erase_size || nr % card->erase_size)
2188 EXPORT_SYMBOL(mmc_erase_group_aligned);
2190 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2193 struct mmc_host *host = card->host;
2194 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2195 unsigned int last_timeout = 0;
2197 if (card->erase_shift)
2198 max_qty = UINT_MAX >> card->erase_shift;
2199 else if (mmc_card_sd(card))
2202 max_qty = UINT_MAX / card->erase_size;
2204 /* Find the largest qty with an OK timeout */
2207 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2208 timeout = mmc_erase_timeout(card, arg, qty + x);
2209 if (timeout > host->max_discard_to)
2211 if (timeout < last_timeout)
2213 last_timeout = timeout;
2225 /* Convert qty to sectors */
2226 if (card->erase_shift)
2227 max_discard = --qty << card->erase_shift;
2228 else if (mmc_card_sd(card))
2231 max_discard = --qty * card->erase_size;
2236 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2238 struct mmc_host *host = card->host;
2239 unsigned int max_discard, max_trim;
2241 if (!host->max_discard_to)
2245 * Without erase_group_def set, MMC erase timeout depends on clock
2246 * frequence which can change. In that case, the best choice is
2247 * just the preferred erase size.
2249 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2250 return card->pref_erase;
2252 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2253 if (mmc_can_trim(card)) {
2254 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2255 if (max_trim < max_discard)
2256 max_discard = max_trim;
2257 } else if (max_discard < card->erase_size) {
2260 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2261 mmc_hostname(host), max_discard, host->max_discard_to);
2264 EXPORT_SYMBOL(mmc_calc_max_discard);
2266 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2268 struct mmc_command cmd = {0};
2270 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
2273 cmd.opcode = MMC_SET_BLOCKLEN;
2275 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2276 return mmc_wait_for_cmd(card->host, &cmd, 5);
2278 EXPORT_SYMBOL(mmc_set_blocklen);
2280 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2283 struct mmc_command cmd = {0};
2285 cmd.opcode = MMC_SET_BLOCK_COUNT;
2286 cmd.arg = blockcount & 0x0000FFFF;
2289 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2290 return mmc_wait_for_cmd(card->host, &cmd, 5);
2292 EXPORT_SYMBOL(mmc_set_blockcount);
2294 static void mmc_hw_reset_for_init(struct mmc_host *host)
2296 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2298 mmc_host_clk_hold(host);
2299 host->ops->hw_reset(host);
2300 mmc_host_clk_release(host);
2303 int mmc_can_reset(struct mmc_card *card)
2307 if (!mmc_card_mmc(card))
2309 rst_n_function = card->ext_csd.rst_n_function;
2310 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2314 EXPORT_SYMBOL(mmc_can_reset);
2316 static int mmc_do_hw_reset(struct mmc_host *host, int check)
2318 struct mmc_card *card = host->card;
2320 if (!host->bus_ops->power_restore)
2323 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2329 if (!mmc_can_reset(card))
2332 mmc_host_clk_hold(host);
2333 mmc_set_clock(host, host->f_init);
2335 host->ops->hw_reset(host);
2337 /* If the reset has happened, then a status command will fail */
2339 struct mmc_command cmd = {0};
2342 cmd.opcode = MMC_SEND_STATUS;
2343 if (!mmc_host_is_spi(card->host))
2344 cmd.arg = card->rca << 16;
2345 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
2346 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2348 mmc_host_clk_release(host);
2353 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
2354 if (mmc_host_is_spi(host)) {
2355 host->ios.chip_select = MMC_CS_HIGH;
2356 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
2358 host->ios.chip_select = MMC_CS_DONTCARE;
2359 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
2361 host->ios.bus_width = MMC_BUS_WIDTH_1;
2362 host->ios.timing = MMC_TIMING_LEGACY;
2365 mmc_host_clk_release(host);
2367 return host->bus_ops->power_restore(host);
2370 int mmc_hw_reset(struct mmc_host *host)
2372 return mmc_do_hw_reset(host, 0);
2374 EXPORT_SYMBOL(mmc_hw_reset);
2376 int mmc_hw_reset_check(struct mmc_host *host)
2378 return mmc_do_hw_reset(host, 1);
2380 EXPORT_SYMBOL(mmc_hw_reset_check);
2382 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2384 host->f_init = freq;
2386 #ifdef CONFIG_MMC_DEBUG
2387 pr_info("%s: %s: trying to init card at %u Hz\n",
2388 mmc_hostname(host), __func__, host->f_init);
2390 mmc_power_up(host, host->ocr_avail);
2393 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2394 * do a hardware reset if possible.
2396 mmc_hw_reset_for_init(host);
2399 * sdio_reset sends CMD52 to reset card. Since we do not know
2400 * if the card is being re-initialized, just send it. CMD52
2401 * should be ignored by SD/eMMC cards.
2407 mmc_send_if_cond(host, host->ocr_avail);
2409 /* Order's important: probe SDIO, then SD, then MMC */
2410 if (!mmc_attach_sdio(host))
2412 if (!mmc_attach_sd(host))
2414 if (!mmc_attach_mmc(host))
2418 * Simplifying the process of initializing the card.
2419 * modifyed by xbw, at 2014-03-14
2421 if(host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
2426 if(host->restrict_caps & (RESTRICT_CARD_TYPE_SDIO |RESTRICT_CARD_TYPE_SD))
2427 mmc_send_if_cond(host, host->ocr_avail);
2429 /* Order's important: probe SDIO, then SD, then MMC */
2430 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) &&
2431 !mmc_attach_sdio(host))
2433 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SD) &&
2434 !mmc_attach_sd(host))
2436 if ((host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) &&
2437 !mmc_attach_mmc(host))
2441 mmc_power_off(host);
2445 int _mmc_detect_card_removed(struct mmc_host *host)
2449 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
2452 if (!host->card || mmc_card_removed(host->card))
2455 ret = host->bus_ops->alive(host);
2458 * Card detect status and alive check may be out of sync if card is
2459 * removed slowly, when card detect switch changes while card/slot
2460 * pads are still contacted in hardware (refer to "SD Card Mechanical
2461 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2462 * detect work 200ms later for this case.
2464 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2465 mmc_detect_change(host, msecs_to_jiffies(200));
2466 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2470 mmc_card_set_removed(host->card);
2471 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2477 int mmc_detect_card_removed(struct mmc_host *host)
2479 struct mmc_card *card = host->card;
2482 WARN_ON(!host->claimed);
2487 ret = mmc_card_removed(card);
2489 * The card will be considered unchanged unless we have been asked to
2490 * detect a change or host requires polling to provide card detection.
2492 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2495 host->detect_change = 0;
2497 ret = _mmc_detect_card_removed(host);
2498 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2500 * Schedule a detect work as soon as possible to let a
2501 * rescan handle the card removal.
2503 cancel_delayed_work(&host->detect);
2504 _mmc_detect_change(host, 0, false);
2510 EXPORT_SYMBOL(mmc_detect_card_removed);
2512 void mmc_rescan(struct work_struct *work)
2514 struct mmc_host *host =
2515 container_of(work, struct mmc_host, detect.work);
2517 bool extend_wakelock = false;
2519 if (host->rescan_disable)
2522 /* If there is a non-removable card registered, only scan once */
2523 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2525 host->rescan_entered = 1;
2530 * if there is a _removable_ card registered, check whether it is
2533 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
2534 && !(host->caps & MMC_CAP_NONREMOVABLE))
2535 host->bus_ops->detect(host);
2537 host->detect_change = 0;
2539 /* If the card was removed the bus will be marked
2540 * as dead - extend the wakelock so userspace
2543 extend_wakelock = 1;
2546 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2547 * the card is no longer present.
2552 /* if there still is a card present, stop here */
2553 if (host->bus_ops != NULL) {
2559 * Only we can add a new handler, so it's safe to
2560 * release the lock here.
2564 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2565 host->ops->get_cd(host) == 0) {
2566 mmc_claim_host(host);
2567 mmc_power_off(host);
2568 mmc_release_host(host);
2572 mmc_claim_host(host);
2573 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2574 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
2575 extend_wakelock = true;
2578 if (freqs[i] <= host->f_min)
2581 mmc_release_host(host);
2584 if (extend_wakelock)
2585 wake_lock_timeout(&host->detect_wake_lock, HZ / 2);
2587 wake_unlock(&host->detect_wake_lock);
2588 if (host->caps & MMC_CAP_NEEDS_POLL) {
2589 wake_lock(&host->detect_wake_lock);
2590 mmc_schedule_delayed_work(&host->detect, HZ);
2594 void mmc_start_host(struct mmc_host *host)
2596 host->f_init = max(freqs[0], host->f_min);
2597 host->rescan_disable = 0;
2598 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2599 mmc_power_off(host);
2601 mmc_power_up(host, host->ocr_avail);
2602 _mmc_detect_change(host, 0, false);
2605 void mmc_stop_host(struct mmc_host *host)
2607 #ifdef CONFIG_MMC_DEBUG
2608 unsigned long flags;
2609 spin_lock_irqsave(&host->lock, flags);
2611 spin_unlock_irqrestore(&host->lock, flags);
2614 host->rescan_disable = 1;
2615 if (cancel_delayed_work_sync(&host->detect))
2616 wake_unlock(&host->detect_wake_lock);
2617 mmc_flush_scheduled_work();
2619 /* clear pm flags now and let card drivers set them as needed */
2623 if (host->bus_ops && !host->bus_dead) {
2624 /* Calling bus_ops->remove() with a claimed host can deadlock */
2625 host->bus_ops->remove(host);
2626 mmc_claim_host(host);
2627 mmc_detach_bus(host);
2628 mmc_power_off(host);
2629 mmc_release_host(host);
2637 mmc_power_off(host);
2640 int mmc_power_save_host(struct mmc_host *host)
2644 #ifdef CONFIG_MMC_DEBUG
2645 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2650 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2655 if (host->bus_ops->power_save)
2656 ret = host->bus_ops->power_save(host);
2660 mmc_power_off(host);
2664 EXPORT_SYMBOL(mmc_power_save_host);
2666 int mmc_power_restore_host(struct mmc_host *host)
2670 #ifdef CONFIG_MMC_DEBUG
2671 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2676 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2681 mmc_power_up(host, host->card->ocr);
2682 ret = host->bus_ops->power_restore(host);
2688 EXPORT_SYMBOL(mmc_power_restore_host);
2691 * Flush the cache to the non-volatile storage.
2693 int mmc_flush_cache(struct mmc_card *card)
2695 struct mmc_host *host = card->host;
2698 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2701 if (mmc_card_mmc(card) &&
2702 (card->ext_csd.cache_size > 0) &&
2703 (card->ext_csd.cache_ctrl & 1)) {
2704 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2705 EXT_CSD_FLUSH_CACHE, 1, 0);
2707 pr_err("%s: cache flush error %d\n",
2708 mmc_hostname(card->host), err);
2713 EXPORT_SYMBOL(mmc_flush_cache);
2716 * Turn the cache ON/OFF.
2717 * Turning the cache OFF shall trigger flushing of the data
2718 * to the non-volatile storage.
2719 * This function should be called with host claimed
2721 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2723 struct mmc_card *card = host->card;
2724 unsigned int timeout;
2727 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2728 mmc_card_is_removable(host))
2731 if (card && mmc_card_mmc(card) &&
2732 (card->ext_csd.cache_size > 0)) {
2735 if (card->ext_csd.cache_ctrl ^ enable) {
2736 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2737 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2738 EXT_CSD_CACHE_CTRL, enable, timeout);
2740 pr_err("%s: cache %s error %d\n",
2741 mmc_hostname(card->host),
2742 enable ? "on" : "off",
2745 card->ext_csd.cache_ctrl = enable;
2751 EXPORT_SYMBOL(mmc_cache_ctrl);
2755 /* Do the card removal on suspend if card is assumed removeable
2756 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2759 int mmc_pm_notify(struct notifier_block *notify_block,
2760 unsigned long mode, void *unused)
2762 struct mmc_host *host = container_of(
2763 notify_block, struct mmc_host, pm_notify);
2764 unsigned long flags;
2768 case PM_HIBERNATION_PREPARE:
2769 case PM_SUSPEND_PREPARE:
2770 spin_lock_irqsave(&host->lock, flags);
2771 if (mmc_bus_needs_resume(host)) {
2772 spin_unlock_irqrestore(&host->lock, flags);
2775 host->rescan_disable = 1;
2776 spin_unlock_irqrestore(&host->lock, flags);
2777 if (cancel_delayed_work_sync(&host->detect))
2778 wake_unlock(&host->detect_wake_lock);
2783 /* Validate prerequisites for suspend */
2784 if (host->bus_ops->pre_suspend)
2785 err = host->bus_ops->pre_suspend(host);
2786 if (!err && host->bus_ops->suspend)
2789 /* Calling bus_ops->remove() with a claimed host can deadlock */
2790 host->bus_ops->remove(host);
2791 mmc_claim_host(host);
2792 mmc_detach_bus(host);
2793 mmc_power_off(host);
2794 mmc_release_host(host);
2798 case PM_POST_SUSPEND:
2799 case PM_POST_HIBERNATION:
2800 case PM_POST_RESTORE:
2802 spin_lock_irqsave(&host->lock, flags);
2803 if (mmc_bus_manual_resume(host)) {
2804 spin_unlock_irqrestore(&host->lock, flags);
2807 host->rescan_disable = 0;
2808 spin_unlock_irqrestore(&host->lock, flags);
2809 _mmc_detect_change(host, 0, false);
2818 * mmc_init_context_info() - init synchronization context
2821 * Init struct context_info needed to implement asynchronous
2822 * request mechanism, used by mmc core, host driver and mmc requests
2825 void mmc_init_context_info(struct mmc_host *host)
2827 spin_lock_init(&host->context_info.lock);
2828 host->context_info.is_new_req = false;
2829 host->context_info.is_done_rcv = false;
2830 host->context_info.is_waiting_last_req = false;
2831 init_waitqueue_head(&host->context_info.wait);
2834 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2835 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2836 struct sdio_cis *cis,
2837 struct sdio_cccr *cccr,
2838 struct sdio_embedded_func *funcs,
2841 host->embedded_sdio_data.cis = cis;
2842 host->embedded_sdio_data.cccr = cccr;
2843 host->embedded_sdio_data.funcs = funcs;
2844 host->embedded_sdio_data.num_funcs = num_funcs;
2847 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2850 static int __init mmc_init(void)
2854 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2858 ret = mmc_register_bus();
2860 goto destroy_workqueue;
2862 ret = mmc_register_host_class();
2864 goto unregister_bus;
2866 ret = sdio_register_bus();
2868 goto unregister_host_class;
2872 unregister_host_class:
2873 mmc_unregister_host_class();
2875 mmc_unregister_bus();
2877 destroy_workqueue(workqueue);
2882 static void __exit mmc_exit(void)
2884 sdio_unregister_bus();
2885 mmc_unregister_host_class();
2886 mmc_unregister_bus();
2887 destroy_workqueue(workqueue);
2890 subsys_initcall(mmc_init);
2891 module_exit(mmc_exit);
2893 MODULE_LICENSE("GPL");