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 mrq->host->context_info.is_done_rcv = true;
333 wake_up_interruptible(&mrq->host->context_info.wait);
336 static void mmc_wait_done(struct mmc_request *mrq)
338 complete(&mrq->completion);
342 *__mmc_start_data_req() - starts data request
343 * @host: MMC host to start the request
344 * @mrq: data request to start
346 * Sets the done callback to be called when request is completed by the card.
347 * Starts data mmc request execution
349 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
351 mrq->done = mmc_wait_data_done;
353 if (mmc_card_removed(host->card)) {
354 mrq->cmd->error = -ENOMEDIUM;
355 mmc_wait_data_done(mrq);
358 mmc_start_request(host, mrq);
363 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
365 init_completion(&mrq->completion);
366 mrq->done = mmc_wait_done;
367 if (mmc_card_removed(host->card)) {
368 mrq->cmd->error = -ENOMEDIUM;
369 complete(&mrq->completion);
372 mmc_start_request(host, mrq);
377 * mmc_wait_for_data_req_done() - wait for request completed
378 * @host: MMC host to prepare the command.
379 * @mrq: MMC request to wait for
381 * Blocks MMC context till host controller will ack end of data request
382 * execution or new request notification arrives from the block layer.
383 * Handles command retries.
385 * Returns enum mmc_blk_status after checking errors.
387 static int mmc_wait_for_data_req_done(struct mmc_host *host,
388 struct mmc_request *mrq,
389 struct mmc_async_req *next_req)
391 struct mmc_command *cmd;
392 struct mmc_context_info *context_info = &host->context_info;
397 wait_event_interruptible(context_info->wait,
398 (context_info->is_done_rcv ||
399 context_info->is_new_req));
400 spin_lock_irqsave(&context_info->lock, flags);
401 context_info->is_waiting_last_req = false;
402 spin_unlock_irqrestore(&context_info->lock, flags);
403 if (context_info->is_done_rcv) {
404 context_info->is_done_rcv = false;
405 context_info->is_new_req = false;
408 if (!cmd->error || !cmd->retries ||
409 mmc_card_removed(host->card)) {
410 err = host->areq->err_check(host->card,
412 break; /* return err */
414 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
416 cmd->opcode, cmd->error);
419 host->ops->request(host, mrq);
420 continue; /* wait for done/new event again */
422 } else if (context_info->is_new_req) {
423 context_info->is_new_req = false;
425 err = MMC_BLK_NEW_REQUEST;
426 break; /* return err */
433 static void mmc_wait_for_req_done(struct mmc_host *host,
434 struct mmc_request *mrq)
436 struct mmc_command *cmd;
439 wait_for_completion(&mrq->completion);
444 * If host has timed out waiting for the sanitize
445 * to complete, card might be still in programming state
446 * so let's try to bring the card out of programming
449 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
450 if (!mmc_interrupt_hpi(host->card)) {
451 pr_warning("%s: %s: Interrupted sanitize\n",
452 mmc_hostname(host), __func__);
456 pr_err("%s: %s: Failed to interrupt sanitize\n",
457 mmc_hostname(host), __func__);
460 if (!cmd->error || !cmd->retries ||
461 mmc_card_removed(host->card))
464 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
465 mmc_hostname(host), cmd->opcode, cmd->error);
468 host->ops->request(host, mrq);
473 * mmc_pre_req - Prepare for a new request
474 * @host: MMC host to prepare command
475 * @mrq: MMC request to prepare for
476 * @is_first_req: true if there is no previous started request
477 * that may run in parellel to this call, otherwise false
479 * mmc_pre_req() is called in prior to mmc_start_req() to let
480 * host prepare for the new request. Preparation of a request may be
481 * performed while another request is running on the host.
483 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
486 if (host->ops->pre_req) {
487 mmc_host_clk_hold(host);
488 host->ops->pre_req(host, mrq, is_first_req);
489 mmc_host_clk_release(host);
494 * mmc_post_req - Post process a completed request
495 * @host: MMC host to post process command
496 * @mrq: MMC request to post process for
497 * @err: Error, if non zero, clean up any resources made in pre_req
499 * Let the host post process a completed request. Post processing of
500 * a request may be performed while another reuqest is running.
502 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
505 if (host->ops->post_req) {
506 mmc_host_clk_hold(host);
507 host->ops->post_req(host, mrq, err);
508 mmc_host_clk_release(host);
513 * mmc_start_req - start a non-blocking request
514 * @host: MMC host to start command
515 * @areq: async request to start
516 * @error: out parameter returns 0 for success, otherwise non zero
518 * Start a new MMC custom command request for a host.
519 * If there is on ongoing async request wait for completion
520 * of that request and start the new one and return.
521 * Does not wait for the new request to complete.
523 * Returns the completed request, NULL in case of none completed.
524 * Wait for the an ongoing request (previoulsy started) to complete and
525 * return the completed request. If there is no ongoing request, NULL
526 * is returned without waiting. NULL is not an error condition.
528 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
529 struct mmc_async_req *areq, int *error)
533 struct mmc_async_req *data = host->areq;
535 /* Prepare a new request */
537 mmc_pre_req(host, areq->mrq, !host->areq);
540 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
541 if (err == MMC_BLK_NEW_REQUEST) {
545 * The previous request was not completed,
551 * Check BKOPS urgency for each R1 response
553 if (host->card && mmc_card_mmc(host->card) &&
554 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
555 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
556 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
557 mmc_start_bkops(host->card, true);
561 start_err = __mmc_start_data_req(host, areq->mrq);
565 mmc_post_req(host, host->areq->mrq, 0);
567 /* Cancel a prepared request if it was not started. */
568 if ((err || start_err) && areq)
569 mmc_post_req(host, areq->mrq, -EINVAL);
580 EXPORT_SYMBOL(mmc_start_req);
583 * mmc_wait_for_req - start a request and wait for completion
584 * @host: MMC host to start command
585 * @mrq: MMC request to start
587 * Start a new MMC custom command request for a host, and wait
588 * for the command to complete. Does not attempt to parse the
591 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
593 __mmc_start_req(host, mrq);
594 mmc_wait_for_req_done(host, mrq);
596 EXPORT_SYMBOL(mmc_wait_for_req);
599 * mmc_interrupt_hpi - Issue for High priority Interrupt
600 * @card: the MMC card associated with the HPI transfer
602 * Issued High Priority Interrupt, and check for card status
603 * until out-of prg-state.
605 int mmc_interrupt_hpi(struct mmc_card *card)
609 unsigned long prg_wait;
613 if (!card->ext_csd.hpi_en) {
614 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
618 mmc_claim_host(card->host);
619 err = mmc_send_status(card, &status);
621 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
625 switch (R1_CURRENT_STATE(status)) {
631 * In idle and transfer states, HPI is not needed and the caller
632 * can issue the next intended command immediately
638 /* In all other states, it's illegal to issue HPI */
639 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
640 mmc_hostname(card->host), R1_CURRENT_STATE(status));
645 err = mmc_send_hpi_cmd(card, &status);
649 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
651 err = mmc_send_status(card, &status);
653 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
655 if (time_after(jiffies, prg_wait))
660 mmc_release_host(card->host);
663 EXPORT_SYMBOL(mmc_interrupt_hpi);
666 * mmc_wait_for_cmd - start a command and wait for completion
667 * @host: MMC host to start command
668 * @cmd: MMC command to start
669 * @retries: maximum number of retries
671 * Start a new MMC command for a host, and wait for the command
672 * to complete. Return any error that occurred while the command
673 * was executing. Do not attempt to parse the response.
675 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
677 struct mmc_request mrq = {NULL};
679 WARN_ON(!host->claimed);
681 memset(cmd->resp, 0, sizeof(cmd->resp));
682 cmd->retries = retries;
687 mmc_wait_for_req(host, &mrq);
692 EXPORT_SYMBOL(mmc_wait_for_cmd);
695 * mmc_stop_bkops - stop ongoing BKOPS
696 * @card: MMC card to check BKOPS
698 * Send HPI command to stop ongoing background operations to
699 * allow rapid servicing of foreground operations, e.g. read/
700 * writes. Wait until the card comes out of the programming state
701 * to avoid errors in servicing read/write requests.
703 int mmc_stop_bkops(struct mmc_card *card)
708 err = mmc_interrupt_hpi(card);
711 * If err is EINVAL, we can't issue an HPI.
712 * It should complete the BKOPS.
714 if (!err || (err == -EINVAL)) {
715 mmc_card_clr_doing_bkops(card);
721 EXPORT_SYMBOL(mmc_stop_bkops);
723 int mmc_read_bkops_status(struct mmc_card *card)
729 * In future work, we should consider storing the entire ext_csd.
731 ext_csd = kmalloc(512, GFP_KERNEL);
733 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
734 mmc_hostname(card->host));
738 mmc_claim_host(card->host);
739 err = mmc_send_ext_csd(card, ext_csd);
740 mmc_release_host(card->host);
744 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
745 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
750 EXPORT_SYMBOL(mmc_read_bkops_status);
753 * mmc_set_data_timeout - set the timeout for a data command
754 * @data: data phase for command
755 * @card: the MMC card associated with the data transfer
757 * Computes the data timeout parameters according to the
758 * correct algorithm given the card type.
760 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
765 * SDIO cards only define an upper 1 s limit on access.
767 if (mmc_card_sdio(card)) {
768 data->timeout_ns = 1000000000;
769 data->timeout_clks = 0;
774 * SD cards use a 100 multiplier rather than 10
776 mult = mmc_card_sd(card) ? 100 : 10;
779 * Scale up the multiplier (and therefore the timeout) by
780 * the r2w factor for writes.
782 if (data->flags & MMC_DATA_WRITE)
783 mult <<= card->csd.r2w_factor;
785 data->timeout_ns = card->csd.tacc_ns * mult;
786 data->timeout_clks = card->csd.tacc_clks * mult;
789 * SD cards also have an upper limit on the timeout.
791 if (mmc_card_sd(card)) {
792 unsigned int timeout_us, limit_us;
794 timeout_us = data->timeout_ns / 1000;
795 if (mmc_host_clk_rate(card->host))
796 timeout_us += data->timeout_clks * 1000 /
797 (mmc_host_clk_rate(card->host) / 1000);
799 if (data->flags & MMC_DATA_WRITE)
801 * The MMC spec "It is strongly recommended
802 * for hosts to implement more than 500ms
803 * timeout value even if the card indicates
804 * the 250ms maximum busy length." Even the
805 * previous value of 300ms is known to be
806 * insufficient for some cards.
813 * SDHC cards always use these fixed values.
815 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
816 data->timeout_ns = limit_us * 1000;
817 data->timeout_clks = 0;
822 * Some cards require longer data read timeout than indicated in CSD.
823 * Address this by setting the read timeout to a "reasonably high"
824 * value. For the cards tested, 300ms has proven enough. If necessary,
825 * this value can be increased if other problematic cards require this.
827 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
828 data->timeout_ns = 300000000;
829 data->timeout_clks = 0;
833 * Some cards need very high timeouts if driven in SPI mode.
834 * The worst observed timeout was 900ms after writing a
835 * continuous stream of data until the internal logic
838 if (mmc_host_is_spi(card->host)) {
839 if (data->flags & MMC_DATA_WRITE) {
840 if (data->timeout_ns < 1000000000)
841 data->timeout_ns = 1000000000; /* 1s */
843 if (data->timeout_ns < 100000000)
844 data->timeout_ns = 100000000; /* 100ms */
848 EXPORT_SYMBOL(mmc_set_data_timeout);
851 * mmc_align_data_size - pads a transfer size to a more optimal value
852 * @card: the MMC card associated with the data transfer
853 * @sz: original transfer size
855 * Pads the original data size with a number of extra bytes in
856 * order to avoid controller bugs and/or performance hits
857 * (e.g. some controllers revert to PIO for certain sizes).
859 * Returns the improved size, which might be unmodified.
861 * Note that this function is only relevant when issuing a
862 * single scatter gather entry.
864 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
867 * FIXME: We don't have a system for the controller to tell
868 * the core about its problems yet, so for now we just 32-bit
871 sz = ((sz + 3) / 4) * 4;
875 EXPORT_SYMBOL(mmc_align_data_size);
878 * __mmc_claim_host - exclusively claim a host
879 * @host: mmc host to claim
880 * @abort: whether or not the operation should be aborted
882 * Claim a host for a set of operations. If @abort is non null and
883 * dereference a non-zero value then this will return prematurely with
884 * that non-zero value without acquiring the lock. Returns zero
885 * with the lock held otherwise.
887 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
889 DECLARE_WAITQUEUE(wait, current);
895 add_wait_queue(&host->wq, &wait);
896 spin_lock_irqsave(&host->lock, flags);
898 set_current_state(TASK_UNINTERRUPTIBLE);
899 stop = abort ? atomic_read(abort) : 0;
900 if (stop || !host->claimed || host->claimer == current)
902 spin_unlock_irqrestore(&host->lock, flags);
904 spin_lock_irqsave(&host->lock, flags);
906 set_current_state(TASK_RUNNING);
909 host->claimer = current;
910 host->claim_cnt += 1;
913 spin_unlock_irqrestore(&host->lock, flags);
914 remove_wait_queue(&host->wq, &wait);
915 if (host->ops->enable && !stop && host->claim_cnt == 1)
916 host->ops->enable(host);
920 EXPORT_SYMBOL(__mmc_claim_host);
923 * mmc_release_host - release a host
924 * @host: mmc host to release
926 * Release a MMC host, allowing others to claim the host
927 * for their operations.
929 void mmc_release_host(struct mmc_host *host)
933 WARN_ON(!host->claimed);
935 if (host->ops->disable && host->claim_cnt == 1)
936 host->ops->disable(host);
938 spin_lock_irqsave(&host->lock, flags);
939 if (--host->claim_cnt) {
940 /* Release for nested claim */
941 spin_unlock_irqrestore(&host->lock, flags);
944 host->claimer = NULL;
945 spin_unlock_irqrestore(&host->lock, flags);
949 EXPORT_SYMBOL(mmc_release_host);
952 * This is a helper function, which fetches a runtime pm reference for the
953 * card device and also claims the host.
955 void mmc_get_card(struct mmc_card *card)
957 pm_runtime_get_sync(&card->dev);
958 mmc_claim_host(card->host);
960 EXPORT_SYMBOL(mmc_get_card);
963 * This is a helper function, which releases the host and drops the runtime
964 * pm reference for the card device.
966 void mmc_put_card(struct mmc_card *card)
968 mmc_release_host(card->host);
969 pm_runtime_mark_last_busy(&card->dev);
970 pm_runtime_put_autosuspend(&card->dev);
972 EXPORT_SYMBOL(mmc_put_card);
975 * Internal function that does the actual ios call to the host driver,
976 * optionally printing some debug output.
978 static inline void mmc_set_ios(struct mmc_host *host)
980 struct mmc_ios *ios = &host->ios;
982 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
983 "width %u timing %u\n",
984 mmc_hostname(host), ios->clock, ios->bus_mode,
985 ios->power_mode, ios->chip_select, ios->vdd,
986 ios->bus_width, ios->timing);
989 mmc_set_ungated(host);
990 host->ops->set_ios(host, ios);
994 * Control chip select pin on a host.
996 void mmc_set_chip_select(struct mmc_host *host, int mode)
998 mmc_host_clk_hold(host);
999 host->ios.chip_select = mode;
1001 mmc_host_clk_release(host);
1005 * Sets the host clock to the highest possible frequency that
1008 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
1010 WARN_ON(hz < host->f_min);
1012 if (hz > host->f_max)
1015 host->ios.clock = hz;
1019 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1021 mmc_host_clk_hold(host);
1022 __mmc_set_clock(host, hz);
1023 mmc_host_clk_release(host);
1026 #ifdef CONFIG_MMC_CLKGATE
1028 * This gates the clock by setting it to 0 Hz.
1030 void mmc_gate_clock(struct mmc_host *host)
1032 unsigned long flags;
1034 spin_lock_irqsave(&host->clk_lock, flags);
1035 host->clk_old = host->ios.clock;
1036 host->ios.clock = 0;
1037 host->clk_gated = true;
1038 spin_unlock_irqrestore(&host->clk_lock, flags);
1043 * This restores the clock from gating by using the cached
1046 void mmc_ungate_clock(struct mmc_host *host)
1049 * We should previously have gated the clock, so the clock shall
1050 * be 0 here! The clock may however be 0 during initialization,
1051 * when some request operations are performed before setting
1052 * the frequency. When ungate is requested in that situation
1053 * we just ignore the call.
1055 if (host->clk_old) {
1056 BUG_ON(host->ios.clock);
1057 /* This call will also set host->clk_gated to false */
1058 __mmc_set_clock(host, host->clk_old);
1062 void mmc_set_ungated(struct mmc_host *host)
1064 unsigned long flags;
1067 * We've been given a new frequency while the clock is gated,
1068 * so make sure we regard this as ungating it.
1070 spin_lock_irqsave(&host->clk_lock, flags);
1071 host->clk_gated = false;
1072 spin_unlock_irqrestore(&host->clk_lock, flags);
1076 void mmc_set_ungated(struct mmc_host *host)
1082 * Change the bus mode (open drain/push-pull) of a host.
1084 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1086 mmc_host_clk_hold(host);
1087 host->ios.bus_mode = mode;
1089 mmc_host_clk_release(host);
1093 * Change data bus width of a host.
1095 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1097 mmc_host_clk_hold(host);
1098 host->ios.bus_width = width;
1100 mmc_host_clk_release(host);
1104 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1105 * @vdd: voltage (mV)
1106 * @low_bits: prefer low bits in boundary cases
1108 * This function returns the OCR bit number according to the provided @vdd
1109 * value. If conversion is not possible a negative errno value returned.
1111 * Depending on the @low_bits flag the function prefers low or high OCR bits
1112 * on boundary voltages. For example,
1113 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1114 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1116 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1118 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1120 const int max_bit = ilog2(MMC_VDD_35_36);
1123 if (vdd < 1650 || vdd > 3600)
1126 if (vdd >= 1650 && vdd <= 1950)
1127 return ilog2(MMC_VDD_165_195);
1132 /* Base 2000 mV, step 100 mV, bit's base 8. */
1133 bit = (vdd - 2000) / 100 + 8;
1140 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1141 * @vdd_min: minimum voltage value (mV)
1142 * @vdd_max: maximum voltage value (mV)
1144 * This function returns the OCR mask bits according to the provided @vdd_min
1145 * and @vdd_max values. If conversion is not possible the function returns 0.
1147 * Notes wrt boundary cases:
1148 * This function sets the OCR bits for all boundary voltages, for example
1149 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1150 * MMC_VDD_34_35 mask.
1152 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1156 if (vdd_max < vdd_min)
1159 /* Prefer high bits for the boundary vdd_max values. */
1160 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1164 /* Prefer low bits for the boundary vdd_min values. */
1165 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1169 /* Fill the mask, from max bit to min bit. */
1170 while (vdd_max >= vdd_min)
1171 mask |= 1 << vdd_max--;
1175 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1180 * mmc_of_parse_voltage - return mask of supported voltages
1181 * @np: The device node need to be parsed.
1182 * @mask: mask of voltages available for MMC/SD/SDIO
1184 * 1. Return zero on success.
1185 * 2. Return negative errno: voltage-range is invalid.
1187 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1189 const u32 *voltage_ranges;
1192 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1193 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1194 if (!voltage_ranges || !num_ranges) {
1195 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1199 for (i = 0; i < num_ranges; i++) {
1200 const int j = i * 2;
1203 ocr_mask = mmc_vddrange_to_ocrmask(
1204 be32_to_cpu(voltage_ranges[j]),
1205 be32_to_cpu(voltage_ranges[j + 1]));
1207 pr_err("%s: voltage-range #%d is invalid\n",
1216 EXPORT_SYMBOL(mmc_of_parse_voltage);
1218 #endif /* CONFIG_OF */
1220 #ifdef CONFIG_REGULATOR
1223 * mmc_regulator_get_ocrmask - return mask of supported voltages
1224 * @supply: regulator to use
1226 * This returns either a negative errno, or a mask of voltages that
1227 * can be provided to MMC/SD/SDIO devices using the specified voltage
1228 * regulator. This would normally be called before registering the
1231 int mmc_regulator_get_ocrmask(struct regulator *supply)
1237 count = regulator_count_voltages(supply);
1241 for (i = 0; i < count; i++) {
1245 vdd_uV = regulator_list_voltage(supply, i);
1249 vdd_mV = vdd_uV / 1000;
1250 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1255 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1258 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1259 * @mmc: the host to regulate
1260 * @supply: regulator to use
1261 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1263 * Returns zero on success, else negative errno.
1265 * MMC host drivers may use this to enable or disable a regulator using
1266 * a particular supply voltage. This would normally be called from the
1269 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1270 struct regulator *supply,
1271 unsigned short vdd_bit)
1281 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1282 * bits this regulator doesn't quite support ... don't
1283 * be too picky, most cards and regulators are OK with
1284 * a 0.1V range goof (it's a small error percentage).
1286 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1288 min_uV = 1650 * 1000;
1289 max_uV = 1950 * 1000;
1291 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1292 max_uV = min_uV + 100 * 1000;
1296 * If we're using a fixed/static regulator, don't call
1297 * regulator_set_voltage; it would fail.
1299 voltage = regulator_get_voltage(supply);
1301 if (!regulator_can_change_voltage(supply))
1302 min_uV = max_uV = voltage;
1306 else if (voltage < min_uV || voltage > max_uV)
1307 result = regulator_set_voltage(supply, min_uV, max_uV);
1311 if (result == 0 && !mmc->regulator_enabled) {
1312 result = regulator_enable(supply);
1314 mmc->regulator_enabled = true;
1316 } else if (mmc->regulator_enabled) {
1317 result = regulator_disable(supply);
1319 mmc->regulator_enabled = false;
1323 dev_err(mmc_dev(mmc),
1324 "could not set regulator OCR (%d)\n", result);
1327 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1329 int mmc_regulator_get_supply(struct mmc_host *mmc)
1331 struct device *dev = mmc_dev(mmc);
1332 struct regulator *supply;
1335 supply = devm_regulator_get(dev, "vmmc");
1336 mmc->supply.vmmc = supply;
1337 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1340 return PTR_ERR(supply);
1342 ret = mmc_regulator_get_ocrmask(supply);
1344 mmc->ocr_avail = ret;
1346 dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
1350 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1352 #endif /* CONFIG_REGULATOR */
1355 * Mask off any voltages we don't support and select
1356 * the lowest voltage
1358 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1363 * Sanity check the voltages that the card claims to
1367 dev_warn(mmc_dev(host),
1368 "card claims to support voltages below defined range\n");
1372 ocr &= host->ocr_avail;
1374 dev_warn(mmc_dev(host), "no support for card's volts\n");
1378 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1381 mmc_power_cycle(host, ocr);
1385 if (bit != host->ios.vdd)
1386 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1392 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1395 int old_signal_voltage = host->ios.signal_voltage;
1397 host->ios.signal_voltage = signal_voltage;
1398 if (host->ops->start_signal_voltage_switch) {
1399 mmc_host_clk_hold(host);
1400 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1401 mmc_host_clk_release(host);
1405 host->ios.signal_voltage = old_signal_voltage;
1411 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1413 struct mmc_command cmd = {0};
1420 * Send CMD11 only if the request is to switch the card to
1423 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1424 return __mmc_set_signal_voltage(host, signal_voltage);
1427 * If we cannot switch voltages, return failure so the caller
1428 * can continue without UHS mode
1430 if (!host->ops->start_signal_voltage_switch)
1432 if (!host->ops->card_busy)
1433 pr_warning("%s: cannot verify signal voltage switch\n",
1434 mmc_hostname(host));
1436 cmd.opcode = SD_SWITCH_VOLTAGE;
1438 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1440 err = mmc_wait_for_cmd(host, &cmd, 0);
1444 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1447 mmc_host_clk_hold(host);
1449 * The card should drive cmd and dat[0:3] low immediately
1450 * after the response of cmd11, but wait 1 ms to be sure
1453 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1458 * During a signal voltage level switch, the clock must be gated
1459 * for 5 ms according to the SD spec
1461 clock = host->ios.clock;
1462 host->ios.clock = 0;
1465 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1467 * Voltages may not have been switched, but we've already
1468 * sent CMD11, so a power cycle is required anyway
1474 /* Keep clock gated for at least 5 ms */
1476 host->ios.clock = clock;
1479 /* Wait for at least 1 ms according to spec */
1483 * Failure to switch is indicated by the card holding
1486 if (host->ops->card_busy && host->ops->card_busy(host))
1491 pr_debug("%s: Signal voltage switch failed, "
1492 "power cycling card\n", mmc_hostname(host));
1493 mmc_power_cycle(host, ocr);
1496 mmc_host_clk_release(host);
1502 * Select timing parameters for host.
1504 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1506 mmc_host_clk_hold(host);
1507 host->ios.timing = timing;
1509 mmc_host_clk_release(host);
1513 * Select appropriate driver type for host.
1515 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1517 mmc_host_clk_hold(host);
1518 host->ios.drv_type = drv_type;
1520 mmc_host_clk_release(host);
1524 * Apply power to the MMC stack. This is a two-stage process.
1525 * First, we enable power to the card without the clock running.
1526 * We then wait a bit for the power to stabilise. Finally,
1527 * enable the bus drivers and clock to the card.
1529 * We must _NOT_ enable the clock prior to power stablising.
1531 * If a host does all the power sequencing itself, ignore the
1532 * initial MMC_POWER_UP stage.
1534 void mmc_power_up(struct mmc_host *host, u32 ocr)
1536 if (host->ios.power_mode == MMC_POWER_ON)
1539 mmc_host_clk_hold(host);
1541 host->ios.vdd = fls(ocr) - 1;
1542 if (mmc_host_is_spi(host))
1543 host->ios.chip_select = MMC_CS_HIGH;
1545 host->ios.chip_select = MMC_CS_DONTCARE;
1546 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1547 host->ios.power_mode = MMC_POWER_UP;
1548 host->ios.bus_width = MMC_BUS_WIDTH_1;
1549 host->ios.timing = MMC_TIMING_LEGACY;
1552 /* Set signal voltage to 3.3V */
1553 __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1556 * This delay should be sufficient to allow the power supply
1557 * to reach the minimum voltage.
1561 host->ios.clock = host->f_init;
1563 host->ios.power_mode = MMC_POWER_ON;
1567 * This delay must be at least 74 clock sizes, or 1 ms, or the
1568 * time required to reach a stable voltage.
1572 mmc_host_clk_release(host);
1575 void mmc_power_off(struct mmc_host *host)
1577 if (host->ios.power_mode == MMC_POWER_OFF)
1580 mmc_host_clk_hold(host);
1582 host->ios.clock = 0;
1585 if (!mmc_host_is_spi(host)) {
1586 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1587 host->ios.chip_select = MMC_CS_DONTCARE;
1589 host->ios.power_mode = MMC_POWER_OFF;
1590 host->ios.bus_width = MMC_BUS_WIDTH_1;
1591 host->ios.timing = MMC_TIMING_LEGACY;
1595 * Some configurations, such as the 802.11 SDIO card in the OLPC
1596 * XO-1.5, require a short delay after poweroff before the card
1597 * can be successfully turned on again.
1601 mmc_host_clk_release(host);
1604 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1606 mmc_power_off(host);
1607 /* Wait at least 1 ms according to SD spec */
1609 mmc_power_up(host, ocr);
1613 * Cleanup when the last reference to the bus operator is dropped.
1615 static void __mmc_release_bus(struct mmc_host *host)
1618 BUG_ON(host->bus_refs);
1619 BUG_ON(!host->bus_dead);
1621 host->bus_ops = NULL;
1625 * Increase reference count of bus operator
1627 static inline void mmc_bus_get(struct mmc_host *host)
1629 unsigned long flags;
1631 spin_lock_irqsave(&host->lock, flags);
1633 spin_unlock_irqrestore(&host->lock, flags);
1637 * Decrease reference count of bus operator and free it if
1638 * it is the last reference.
1640 static inline void mmc_bus_put(struct mmc_host *host)
1642 unsigned long flags;
1644 spin_lock_irqsave(&host->lock, flags);
1646 if ((host->bus_refs == 0) && host->bus_ops)
1647 __mmc_release_bus(host);
1648 spin_unlock_irqrestore(&host->lock, flags);
1652 int mmc_resume_bus(struct mmc_host *host)
1654 unsigned long flags;
1656 if (!mmc_bus_needs_resume(host))
1659 printk("%s: Starting deferred resume\n", mmc_hostname(host));
1660 spin_lock_irqsave(&host->lock, flags);
1661 host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME;
1662 host->rescan_disable = 0;
1663 spin_unlock_irqrestore(&host->lock, flags);
1666 if (host->bus_ops && !host->bus_dead) {
1668 BUG_ON(!host->bus_ops->resume);
1669 host->bus_ops->resume(host);
1672 if (host->bus_ops->detect && !host->bus_dead)
1673 host->bus_ops->detect(host);
1676 printk("%s: Deferred resume completed\n", mmc_hostname(host));
1680 EXPORT_SYMBOL(mmc_resume_bus);
1684 * Assign a mmc bus handler to a host. Only one bus handler may control a
1685 * host at any given time.
1687 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1689 unsigned long flags;
1694 WARN_ON(!host->claimed);
1696 spin_lock_irqsave(&host->lock, flags);
1698 BUG_ON(host->bus_ops);
1699 BUG_ON(host->bus_refs);
1701 host->bus_ops = ops;
1705 spin_unlock_irqrestore(&host->lock, flags);
1709 * Remove the current bus handler from a host.
1711 void mmc_detach_bus(struct mmc_host *host)
1713 unsigned long flags;
1717 WARN_ON(!host->claimed);
1718 WARN_ON(!host->bus_ops);
1720 spin_lock_irqsave(&host->lock, flags);
1724 spin_unlock_irqrestore(&host->lock, flags);
1729 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1732 #ifdef CONFIG_MMC_DEBUG
1733 unsigned long flags;
1734 spin_lock_irqsave(&host->lock, flags);
1735 WARN_ON(host->removed);
1736 spin_unlock_irqrestore(&host->lock, flags);
1740 * If the device is configured as wakeup, we prevent a new sleep for
1741 * 5 s to give provision for user space to consume the event.
1743 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1744 device_can_wakeup(mmc_dev(host)))
1745 pm_wakeup_event(mmc_dev(host), 5000);
1747 host->detect_change = 1;
1748 mmc_schedule_delayed_work(&host->detect, delay);
1752 * mmc_detect_change - process change of state on a MMC socket
1753 * @host: host which changed state.
1754 * @delay: optional delay to wait before detection (jiffies)
1756 * MMC drivers should call this when they detect a card has been
1757 * inserted or removed. The MMC layer will confirm that any
1758 * present card is still functional, and initialize any newly
1761 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1763 _mmc_detect_change(host, delay, true);
1765 EXPORT_SYMBOL(mmc_detect_change);
1767 void mmc_init_erase(struct mmc_card *card)
1771 if (is_power_of_2(card->erase_size))
1772 card->erase_shift = ffs(card->erase_size) - 1;
1774 card->erase_shift = 0;
1777 * It is possible to erase an arbitrarily large area of an SD or MMC
1778 * card. That is not desirable because it can take a long time
1779 * (minutes) potentially delaying more important I/O, and also the
1780 * timeout calculations become increasingly hugely over-estimated.
1781 * Consequently, 'pref_erase' is defined as a guide to limit erases
1782 * to that size and alignment.
1784 * For SD cards that define Allocation Unit size, limit erases to one
1785 * Allocation Unit at a time. For MMC cards that define High Capacity
1786 * Erase Size, whether it is switched on or not, limit to that size.
1787 * Otherwise just have a stab at a good value. For modern cards it
1788 * will end up being 4MiB. Note that if the value is too small, it
1789 * can end up taking longer to erase.
1791 if (mmc_card_sd(card) && card->ssr.au) {
1792 card->pref_erase = card->ssr.au;
1793 card->erase_shift = ffs(card->ssr.au) - 1;
1794 } else if (card->ext_csd.hc_erase_size) {
1795 card->pref_erase = card->ext_csd.hc_erase_size;
1797 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1799 card->pref_erase = 512 * 1024 / 512;
1801 card->pref_erase = 1024 * 1024 / 512;
1803 card->pref_erase = 2 * 1024 * 1024 / 512;
1805 card->pref_erase = 4 * 1024 * 1024 / 512;
1806 if (card->pref_erase < card->erase_size)
1807 card->pref_erase = card->erase_size;
1809 sz = card->pref_erase % card->erase_size;
1811 card->pref_erase += card->erase_size - sz;
1816 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1817 unsigned int arg, unsigned int qty)
1819 unsigned int erase_timeout;
1821 if (arg == MMC_DISCARD_ARG ||
1822 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1823 erase_timeout = card->ext_csd.trim_timeout;
1824 } else if (card->ext_csd.erase_group_def & 1) {
1825 /* High Capacity Erase Group Size uses HC timeouts */
1826 if (arg == MMC_TRIM_ARG)
1827 erase_timeout = card->ext_csd.trim_timeout;
1829 erase_timeout = card->ext_csd.hc_erase_timeout;
1831 /* CSD Erase Group Size uses write timeout */
1832 unsigned int mult = (10 << card->csd.r2w_factor);
1833 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1834 unsigned int timeout_us;
1836 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1837 if (card->csd.tacc_ns < 1000000)
1838 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1840 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1843 * ios.clock is only a target. The real clock rate might be
1844 * less but not that much less, so fudge it by multiplying by 2.
1847 timeout_us += (timeout_clks * 1000) /
1848 (mmc_host_clk_rate(card->host) / 1000);
1850 erase_timeout = timeout_us / 1000;
1853 * Theoretically, the calculation could underflow so round up
1854 * to 1ms in that case.
1860 /* Multiplier for secure operations */
1861 if (arg & MMC_SECURE_ARGS) {
1862 if (arg == MMC_SECURE_ERASE_ARG)
1863 erase_timeout *= card->ext_csd.sec_erase_mult;
1865 erase_timeout *= card->ext_csd.sec_trim_mult;
1868 erase_timeout *= qty;
1871 * Ensure at least a 1 second timeout for SPI as per
1872 * 'mmc_set_data_timeout()'
1874 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1875 erase_timeout = 1000;
1877 return erase_timeout;
1880 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1884 unsigned int erase_timeout;
1886 if (card->ssr.erase_timeout) {
1887 /* Erase timeout specified in SD Status Register (SSR) */
1888 erase_timeout = card->ssr.erase_timeout * qty +
1889 card->ssr.erase_offset;
1892 * Erase timeout not specified in SD Status Register (SSR) so
1893 * use 250ms per write block.
1895 erase_timeout = 250 * qty;
1898 /* Must not be less than 1 second */
1899 if (erase_timeout < 1000)
1900 erase_timeout = 1000;
1902 return erase_timeout;
1905 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1909 if (mmc_card_sd(card))
1910 return mmc_sd_erase_timeout(card, arg, qty);
1912 return mmc_mmc_erase_timeout(card, arg, qty);
1915 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1916 unsigned int to, unsigned int arg)
1918 struct mmc_command cmd = {0};
1919 unsigned int qty = 0;
1920 unsigned long timeout;
1921 unsigned int fr, nr;
1928 * qty is used to calculate the erase timeout which depends on how many
1929 * erase groups (or allocation units in SD terminology) are affected.
1930 * We count erasing part of an erase group as one erase group.
1931 * For SD, the allocation units are always a power of 2. For MMC, the
1932 * erase group size is almost certainly also power of 2, but it does not
1933 * seem to insist on that in the JEDEC standard, so we fall back to
1934 * division in that case. SD may not specify an allocation unit size,
1935 * in which case the timeout is based on the number of write blocks.
1937 * Note that the timeout for secure trim 2 will only be correct if the
1938 * number of erase groups specified is the same as the total of all
1939 * preceding secure trim 1 commands. Since the power may have been
1940 * lost since the secure trim 1 commands occurred, it is generally
1941 * impossible to calculate the secure trim 2 timeout correctly.
1943 if (card->erase_shift)
1944 qty += ((to >> card->erase_shift) -
1945 (from >> card->erase_shift)) + 1;
1946 else if (mmc_card_sd(card))
1947 qty += to - from + 1;
1949 qty += ((to / card->erase_size) -
1950 (from / card->erase_size)) + 1;
1952 if (!mmc_card_blockaddr(card)) {
1957 if (mmc_card_sd(card))
1958 cmd.opcode = SD_ERASE_WR_BLK_START;
1960 cmd.opcode = MMC_ERASE_GROUP_START;
1962 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1963 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1965 pr_err("mmc_erase: group start error %d, "
1966 "status %#x\n", err, cmd.resp[0]);
1971 memset(&cmd, 0, sizeof(struct mmc_command));
1972 if (mmc_card_sd(card))
1973 cmd.opcode = SD_ERASE_WR_BLK_END;
1975 cmd.opcode = MMC_ERASE_GROUP_END;
1977 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1978 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1980 pr_err("mmc_erase: group end error %d, status %#x\n",
1986 memset(&cmd, 0, sizeof(struct mmc_command));
1987 cmd.opcode = MMC_ERASE;
1989 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1990 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
1991 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1993 pr_err("mmc_erase: erase error %d, status %#x\n",
1999 if (mmc_host_is_spi(card->host))
2002 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2004 memset(&cmd, 0, sizeof(struct mmc_command));
2005 cmd.opcode = MMC_SEND_STATUS;
2006 cmd.arg = card->rca << 16;
2007 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2008 /* Do not retry else we can't see errors */
2009 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2010 if (err || (cmd.resp[0] & 0xFDF92000)) {
2011 pr_err("error %d requesting status %#x\n",
2017 /* Timeout if the device never becomes ready for data and
2018 * never leaves the program state.
2020 if (time_after(jiffies, timeout)) {
2021 pr_err("%s: Card stuck in programming state! %s\n",
2022 mmc_hostname(card->host), __func__);
2027 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2028 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2035 * mmc_erase - erase sectors.
2036 * @card: card to erase
2037 * @from: first sector to erase
2038 * @nr: number of sectors to erase
2039 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2041 * Caller must claim host before calling this function.
2043 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2046 unsigned int rem, to = from + nr;
2048 if (!(card->host->caps & MMC_CAP_ERASE) ||
2049 !(card->csd.cmdclass & CCC_ERASE))
2052 if (!card->erase_size)
2055 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2058 if ((arg & MMC_SECURE_ARGS) &&
2059 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2062 if ((arg & MMC_TRIM_ARGS) &&
2063 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2066 if (arg == MMC_SECURE_ERASE_ARG) {
2067 if (from % card->erase_size || nr % card->erase_size)
2071 if (arg == MMC_ERASE_ARG) {
2072 rem = from % card->erase_size;
2074 rem = card->erase_size - rem;
2081 rem = nr % card->erase_size;
2094 /* 'from' and 'to' are inclusive */
2097 return mmc_do_erase(card, from, to, arg);
2099 EXPORT_SYMBOL(mmc_erase);
2101 int mmc_can_erase(struct mmc_card *card)
2103 if ((card->host->caps & MMC_CAP_ERASE) &&
2104 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2108 EXPORT_SYMBOL(mmc_can_erase);
2110 int mmc_can_trim(struct mmc_card *card)
2112 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
2116 EXPORT_SYMBOL(mmc_can_trim);
2118 int mmc_can_discard(struct mmc_card *card)
2121 * As there's no way to detect the discard support bit at v4.5
2122 * use the s/w feature support filed.
2124 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2128 EXPORT_SYMBOL(mmc_can_discard);
2130 int mmc_can_sanitize(struct mmc_card *card)
2132 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2134 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2138 EXPORT_SYMBOL(mmc_can_sanitize);
2140 int mmc_can_secure_erase_trim(struct mmc_card *card)
2142 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
2146 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2148 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2151 if (!card->erase_size)
2153 if (from % card->erase_size || nr % card->erase_size)
2157 EXPORT_SYMBOL(mmc_erase_group_aligned);
2159 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2162 struct mmc_host *host = card->host;
2163 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2164 unsigned int last_timeout = 0;
2166 if (card->erase_shift)
2167 max_qty = UINT_MAX >> card->erase_shift;
2168 else if (mmc_card_sd(card))
2171 max_qty = UINT_MAX / card->erase_size;
2173 /* Find the largest qty with an OK timeout */
2176 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2177 timeout = mmc_erase_timeout(card, arg, qty + x);
2178 if (timeout > host->max_discard_to)
2180 if (timeout < last_timeout)
2182 last_timeout = timeout;
2194 /* Convert qty to sectors */
2195 if (card->erase_shift)
2196 max_discard = --qty << card->erase_shift;
2197 else if (mmc_card_sd(card))
2200 max_discard = --qty * card->erase_size;
2205 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2207 struct mmc_host *host = card->host;
2208 unsigned int max_discard, max_trim;
2210 if (!host->max_discard_to)
2214 * Without erase_group_def set, MMC erase timeout depends on clock
2215 * frequence which can change. In that case, the best choice is
2216 * just the preferred erase size.
2218 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2219 return card->pref_erase;
2221 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2222 if (mmc_can_trim(card)) {
2223 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2224 if (max_trim < max_discard)
2225 max_discard = max_trim;
2226 } else if (max_discard < card->erase_size) {
2229 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2230 mmc_hostname(host), max_discard, host->max_discard_to);
2233 EXPORT_SYMBOL(mmc_calc_max_discard);
2235 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2237 struct mmc_command cmd = {0};
2239 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
2242 cmd.opcode = MMC_SET_BLOCKLEN;
2244 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2245 return mmc_wait_for_cmd(card->host, &cmd, 5);
2247 EXPORT_SYMBOL(mmc_set_blocklen);
2249 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2252 struct mmc_command cmd = {0};
2254 cmd.opcode = MMC_SET_BLOCK_COUNT;
2255 cmd.arg = blockcount & 0x0000FFFF;
2258 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2259 return mmc_wait_for_cmd(card->host, &cmd, 5);
2261 EXPORT_SYMBOL(mmc_set_blockcount);
2263 static void mmc_hw_reset_for_init(struct mmc_host *host)
2265 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2267 mmc_host_clk_hold(host);
2268 host->ops->hw_reset(host);
2269 mmc_host_clk_release(host);
2272 int mmc_can_reset(struct mmc_card *card)
2276 if (!mmc_card_mmc(card))
2278 rst_n_function = card->ext_csd.rst_n_function;
2279 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2283 EXPORT_SYMBOL(mmc_can_reset);
2285 static int mmc_do_hw_reset(struct mmc_host *host, int check)
2287 struct mmc_card *card = host->card;
2289 if (!host->bus_ops->power_restore)
2292 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2298 if (!mmc_can_reset(card))
2301 mmc_host_clk_hold(host);
2302 mmc_set_clock(host, host->f_init);
2304 host->ops->hw_reset(host);
2306 /* If the reset has happened, then a status command will fail */
2308 struct mmc_command cmd = {0};
2311 cmd.opcode = MMC_SEND_STATUS;
2312 if (!mmc_host_is_spi(card->host))
2313 cmd.arg = card->rca << 16;
2314 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
2315 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2317 mmc_host_clk_release(host);
2322 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
2323 if (mmc_host_is_spi(host)) {
2324 host->ios.chip_select = MMC_CS_HIGH;
2325 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
2327 host->ios.chip_select = MMC_CS_DONTCARE;
2328 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
2330 host->ios.bus_width = MMC_BUS_WIDTH_1;
2331 host->ios.timing = MMC_TIMING_LEGACY;
2334 mmc_host_clk_release(host);
2336 return host->bus_ops->power_restore(host);
2339 int mmc_hw_reset(struct mmc_host *host)
2341 return mmc_do_hw_reset(host, 0);
2343 EXPORT_SYMBOL(mmc_hw_reset);
2345 int mmc_hw_reset_check(struct mmc_host *host)
2347 return mmc_do_hw_reset(host, 1);
2349 EXPORT_SYMBOL(mmc_hw_reset_check);
2351 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2353 host->f_init = freq;
2355 #ifdef CONFIG_MMC_DEBUG
2356 pr_info("%s: %s: trying to init card at %u Hz\n",
2357 mmc_hostname(host), __func__, host->f_init);
2359 mmc_power_up(host, host->ocr_avail);
2362 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2363 * do a hardware reset if possible.
2365 mmc_hw_reset_for_init(host);
2368 * sdio_reset sends CMD52 to reset card. Since we do not know
2369 * if the card is being re-initialized, just send it. CMD52
2370 * should be ignored by SD/eMMC cards.
2376 mmc_send_if_cond(host, host->ocr_avail);
2378 /* Order's important: probe SDIO, then SD, then MMC */
2379 if (!mmc_attach_sdio(host))
2381 if (!mmc_attach_sd(host))
2383 if (!mmc_attach_mmc(host))
2387 * Simplifying the process of initializing the card.
2388 * modifyed by xbw, at 2014-03-14
2390 if(host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
2395 if(host->restrict_caps & (RESTRICT_CARD_TYPE_SDIO |RESTRICT_CARD_TYPE_SD))
2396 mmc_send_if_cond(host, host->ocr_avail);
2398 /* Order's important: probe SDIO, then SD, then MMC */
2399 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) && !mmc_attach_sdio(host))
2401 if ((host->restrict_caps & (RESTRICT_CARD_TYPE_SD | RESTRICT_CARD_TYPE_TSD)) && !mmc_attach_sd(host))
2403 if ((host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) && !mmc_attach_mmc(host))
2410 mmc_power_off(host);
2414 int _mmc_detect_card_removed(struct mmc_host *host)
2418 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
2421 if (!host->card || mmc_card_removed(host->card))
2424 ret = host->bus_ops->alive(host);
2427 * Card detect status and alive check may be out of sync if card is
2428 * removed slowly, when card detect switch changes while card/slot
2429 * pads are still contacted in hardware (refer to "SD Card Mechanical
2430 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2431 * detect work 200ms later for this case.
2433 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2434 mmc_detect_change(host, msecs_to_jiffies(200));
2435 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2439 mmc_card_set_removed(host->card);
2440 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2446 int mmc_detect_card_removed(struct mmc_host *host)
2448 struct mmc_card *card = host->card;
2451 WARN_ON(!host->claimed);
2456 ret = mmc_card_removed(card);
2458 * The card will be considered unchanged unless we have been asked to
2459 * detect a change or host requires polling to provide card detection.
2461 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2464 host->detect_change = 0;
2466 ret = _mmc_detect_card_removed(host);
2467 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2469 * Schedule a detect work as soon as possible to let a
2470 * rescan handle the card removal.
2472 cancel_delayed_work(&host->detect);
2473 _mmc_detect_change(host, 0, false);
2479 EXPORT_SYMBOL(mmc_detect_card_removed);
2481 void mmc_rescan(struct work_struct *work)
2483 struct mmc_host *host =
2484 container_of(work, struct mmc_host, detect.work);
2486 bool extend_wakelock = false;
2488 if (host->rescan_disable)
2491 /* If there is a non-removable card registered, only scan once */
2492 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2494 host->rescan_entered = 1;
2499 * if there is a _removable_ card registered, check whether it is
2502 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
2503 && !(host->caps & MMC_CAP_NONREMOVABLE))
2504 host->bus_ops->detect(host);
2506 host->detect_change = 0;
2508 /* If the card was removed the bus will be marked
2509 * as dead - extend the wakelock so userspace
2512 extend_wakelock = 1;
2515 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2516 * the card is no longer present.
2521 /* if there still is a card present, stop here */
2522 if (host->bus_ops != NULL) {
2528 * Only we can add a new handler, so it's safe to
2529 * release the lock here.
2533 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2534 host->ops->get_cd(host) == 0) {
2535 mmc_claim_host(host);
2536 mmc_power_off(host);
2537 mmc_release_host(host);
2541 mmc_claim_host(host);
2542 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2543 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
2544 extend_wakelock = true;
2547 if (freqs[i] <= host->f_min)
2550 mmc_release_host(host);
2553 if (extend_wakelock)
2554 wake_lock_timeout(&host->detect_wake_lock, HZ / 2);
2556 wake_unlock(&host->detect_wake_lock);
2557 if (host->caps & MMC_CAP_NEEDS_POLL) {
2558 wake_lock(&host->detect_wake_lock);
2559 mmc_schedule_delayed_work(&host->detect, HZ);
2563 void mmc_start_host(struct mmc_host *host)
2565 host->f_init = max(freqs[0], host->f_min);
2566 host->rescan_disable = 0;
2567 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2568 mmc_power_off(host);
2570 mmc_power_up(host, host->ocr_avail);
2571 _mmc_detect_change(host, 0, false);
2574 void mmc_stop_host(struct mmc_host *host)
2576 #ifdef CONFIG_MMC_DEBUG
2577 unsigned long flags;
2578 spin_lock_irqsave(&host->lock, flags);
2580 spin_unlock_irqrestore(&host->lock, flags);
2583 host->rescan_disable = 1;
2584 if (cancel_delayed_work_sync(&host->detect))
2585 wake_unlock(&host->detect_wake_lock);
2586 mmc_flush_scheduled_work();
2588 /* clear pm flags now and let card drivers set them as needed */
2592 if (host->bus_ops && !host->bus_dead) {
2593 /* Calling bus_ops->remove() with a claimed host can deadlock */
2594 host->bus_ops->remove(host);
2595 mmc_claim_host(host);
2596 mmc_detach_bus(host);
2597 mmc_power_off(host);
2598 mmc_release_host(host);
2606 mmc_power_off(host);
2609 int mmc_power_save_host(struct mmc_host *host)
2613 #ifdef CONFIG_MMC_DEBUG
2614 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2619 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2624 if (host->bus_ops->power_save)
2625 ret = host->bus_ops->power_save(host);
2629 mmc_power_off(host);
2633 EXPORT_SYMBOL(mmc_power_save_host);
2635 int mmc_power_restore_host(struct mmc_host *host)
2639 #ifdef CONFIG_MMC_DEBUG
2640 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2645 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2650 mmc_power_up(host, host->card->ocr);
2651 ret = host->bus_ops->power_restore(host);
2657 EXPORT_SYMBOL(mmc_power_restore_host);
2660 * Flush the cache to the non-volatile storage.
2662 int mmc_flush_cache(struct mmc_card *card)
2664 struct mmc_host *host = card->host;
2667 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2670 if (mmc_card_mmc(card) &&
2671 (card->ext_csd.cache_size > 0) &&
2672 (card->ext_csd.cache_ctrl & 1)) {
2673 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2674 EXT_CSD_FLUSH_CACHE, 1, 0);
2676 pr_err("%s: cache flush error %d\n",
2677 mmc_hostname(card->host), err);
2682 EXPORT_SYMBOL(mmc_flush_cache);
2685 * Turn the cache ON/OFF.
2686 * Turning the cache OFF shall trigger flushing of the data
2687 * to the non-volatile storage.
2688 * This function should be called with host claimed
2690 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2692 struct mmc_card *card = host->card;
2693 unsigned int timeout;
2696 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2697 mmc_card_is_removable(host))
2700 if (card && mmc_card_mmc(card) &&
2701 (card->ext_csd.cache_size > 0)) {
2704 if (card->ext_csd.cache_ctrl ^ enable) {
2705 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2706 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2707 EXT_CSD_CACHE_CTRL, enable, timeout);
2709 pr_err("%s: cache %s error %d\n",
2710 mmc_hostname(card->host),
2711 enable ? "on" : "off",
2714 card->ext_csd.cache_ctrl = enable;
2720 EXPORT_SYMBOL(mmc_cache_ctrl);
2724 /* Do the card removal on suspend if card is assumed removeable
2725 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2728 int mmc_pm_notify(struct notifier_block *notify_block,
2729 unsigned long mode, void *unused)
2731 struct mmc_host *host = container_of(
2732 notify_block, struct mmc_host, pm_notify);
2733 unsigned long flags;
2737 case PM_HIBERNATION_PREPARE:
2738 case PM_SUSPEND_PREPARE:
2739 spin_lock_irqsave(&host->lock, flags);
2740 if (mmc_bus_needs_resume(host)) {
2741 spin_unlock_irqrestore(&host->lock, flags);
2744 host->rescan_disable = 1;
2745 spin_unlock_irqrestore(&host->lock, flags);
2746 if (cancel_delayed_work_sync(&host->detect))
2747 wake_unlock(&host->detect_wake_lock);
2752 /* Validate prerequisites for suspend */
2753 if (host->bus_ops->pre_suspend)
2754 err = host->bus_ops->pre_suspend(host);
2755 if (!err && host->bus_ops->suspend)
2758 /* Calling bus_ops->remove() with a claimed host can deadlock */
2759 host->bus_ops->remove(host);
2760 mmc_claim_host(host);
2761 mmc_detach_bus(host);
2762 mmc_power_off(host);
2763 mmc_release_host(host);
2767 case PM_POST_SUSPEND:
2768 case PM_POST_HIBERNATION:
2769 case PM_POST_RESTORE:
2771 spin_lock_irqsave(&host->lock, flags);
2772 if (mmc_bus_manual_resume(host)) {
2773 spin_unlock_irqrestore(&host->lock, flags);
2776 host->rescan_disable = 0;
2777 spin_unlock_irqrestore(&host->lock, flags);
2778 _mmc_detect_change(host, 0, false);
2787 * mmc_init_context_info() - init synchronization context
2790 * Init struct context_info needed to implement asynchronous
2791 * request mechanism, used by mmc core, host driver and mmc requests
2794 void mmc_init_context_info(struct mmc_host *host)
2796 spin_lock_init(&host->context_info.lock);
2797 host->context_info.is_new_req = false;
2798 host->context_info.is_done_rcv = false;
2799 host->context_info.is_waiting_last_req = false;
2800 init_waitqueue_head(&host->context_info.wait);
2803 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2804 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2805 struct sdio_cis *cis,
2806 struct sdio_cccr *cccr,
2807 struct sdio_embedded_func *funcs,
2810 host->embedded_sdio_data.cis = cis;
2811 host->embedded_sdio_data.cccr = cccr;
2812 host->embedded_sdio_data.funcs = funcs;
2813 host->embedded_sdio_data.num_funcs = num_funcs;
2816 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2819 static int __init mmc_init(void)
2823 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2827 ret = mmc_register_bus();
2829 goto destroy_workqueue;
2831 ret = mmc_register_host_class();
2833 goto unregister_bus;
2835 ret = sdio_register_bus();
2837 goto unregister_host_class;
2841 unregister_host_class:
2842 mmc_unregister_host_class();
2844 mmc_unregister_bus();
2846 destroy_workqueue(workqueue);
2851 static void __exit mmc_exit(void)
2853 sdio_unregister_bus();
2854 mmc_unregister_host_class();
2855 mmc_unregister_bus();
2856 destroy_workqueue(workqueue);
2859 subsys_initcall(mmc_init);
2860 module_exit(mmc_exit);
2862 MODULE_LICENSE("GPL");