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>
37 #include <linux/mmc/slot-gpio.h>
49 /* If the device is not responding */
50 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
53 * Background operations can take a long time, depending on the housekeeping
54 * operations the card has to perform.
56 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
58 static struct workqueue_struct *workqueue;
59 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
62 * Enabling software CRCs on the data blocks can be a significant (30%)
63 * performance cost, and for other reasons may not always be desired.
64 * So we allow it it to be disabled.
67 module_param(use_spi_crc, bool, 0);
70 * Internal function. Schedule delayed work in the MMC work queue.
72 static int mmc_schedule_delayed_work(struct delayed_work *work,
75 return queue_delayed_work(workqueue, work, delay);
79 * Internal function. Flush all scheduled work from the MMC work queue.
81 static void mmc_flush_scheduled_work(void)
83 flush_workqueue(workqueue);
86 #ifdef CONFIG_FAIL_MMC_REQUEST
89 * Internal function. Inject random data errors.
90 * If mmc_data is NULL no errors are injected.
92 static void mmc_should_fail_request(struct mmc_host *host,
93 struct mmc_request *mrq)
95 struct mmc_command *cmd = mrq->cmd;
96 struct mmc_data *data = mrq->data;
97 static const int data_errors[] = {
106 if (cmd->error || data->error ||
107 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
110 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
111 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
114 #else /* CONFIG_FAIL_MMC_REQUEST */
116 static inline void mmc_should_fail_request(struct mmc_host *host,
117 struct mmc_request *mrq)
121 #endif /* CONFIG_FAIL_MMC_REQUEST */
124 * mmc_request_done - finish processing an MMC request
125 * @host: MMC host which completed request
126 * @mrq: MMC request which request
128 * MMC drivers should call this function when they have completed
129 * their processing of a request.
131 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
133 struct mmc_command *cmd = mrq->cmd;
134 int err = cmd->error;
136 /* Flag re-tuning needed on CRC errors */
137 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
138 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
139 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
140 (mrq->data && mrq->data->error == -EILSEQ) ||
141 (mrq->stop && mrq->stop->error == -EILSEQ)))
142 mmc_retune_needed(host);
144 if (err && cmd->retries && mmc_host_is_spi(host)) {
145 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
149 if (err && cmd->retries && !mmc_card_removed(host->card)) {
151 * Request starter must handle retries - see
152 * mmc_wait_for_req_done().
157 mmc_should_fail_request(host, mrq);
159 led_trigger_event(host->led, LED_OFF);
162 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
163 mmc_hostname(host), mrq->sbc->opcode,
165 mrq->sbc->resp[0], mrq->sbc->resp[1],
166 mrq->sbc->resp[2], mrq->sbc->resp[3]);
169 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
170 mmc_hostname(host), cmd->opcode, err,
171 cmd->resp[0], cmd->resp[1],
172 cmd->resp[2], cmd->resp[3]);
175 pr_debug("%s: %d bytes transferred: %d\n",
177 mrq->data->bytes_xfered, mrq->data->error);
181 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
182 mmc_hostname(host), mrq->stop->opcode,
184 mrq->stop->resp[0], mrq->stop->resp[1],
185 mrq->stop->resp[2], mrq->stop->resp[3]);
193 EXPORT_SYMBOL(mmc_request_done);
195 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
199 /* Assumes host controller has been runtime resumed by mmc_claim_host */
200 err = mmc_retune(host);
202 mrq->cmd->error = err;
203 mmc_request_done(host, mrq);
208 * For sdio rw commands we must wait for card busy otherwise some
209 * sdio devices won't work properly.
211 if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
212 int tries = 500; /* Wait aprox 500ms at maximum */
214 while (host->ops->card_busy(host) && --tries)
218 mrq->cmd->error = -EBUSY;
219 mmc_request_done(host, mrq);
224 host->ops->request(host, mrq);
227 static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
229 #ifdef CONFIG_MMC_DEBUG
231 struct scatterlist *sg;
233 mmc_retune_hold(host);
235 if (mmc_card_removed(host->card))
239 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
240 mmc_hostname(host), mrq->sbc->opcode,
241 mrq->sbc->arg, mrq->sbc->flags);
244 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
245 mmc_hostname(host), mrq->cmd->opcode,
246 mrq->cmd->arg, mrq->cmd->flags);
249 pr_debug("%s: blksz %d blocks %d flags %08x "
250 "tsac %d ms nsac %d\n",
251 mmc_hostname(host), mrq->data->blksz,
252 mrq->data->blocks, mrq->data->flags,
253 mrq->data->timeout_ns / 1000000,
254 mrq->data->timeout_clks);
258 pr_debug("%s: CMD%u arg %08x flags %08x\n",
259 mmc_hostname(host), mrq->stop->opcode,
260 mrq->stop->arg, mrq->stop->flags);
263 WARN_ON(!host->claimed);
272 BUG_ON(mrq->data->blksz > host->max_blk_size);
273 BUG_ON(mrq->data->blocks > host->max_blk_count);
274 BUG_ON(mrq->data->blocks * mrq->data->blksz >
277 #ifdef CONFIG_MMC_DEBUG
279 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
281 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
284 mrq->cmd->data = mrq->data;
285 mrq->data->error = 0;
286 mrq->data->mrq = mrq;
288 mrq->data->stop = mrq->stop;
289 mrq->stop->error = 0;
290 mrq->stop->mrq = mrq;
293 led_trigger_event(host->led, LED_FULL);
294 __mmc_start_request(host, mrq);
300 * mmc_start_bkops - start BKOPS for supported cards
301 * @card: MMC card to start BKOPS
302 * @form_exception: A flag to indicate if this function was
303 * called due to an exception raised by the card
305 * Start background operations whenever requested.
306 * When the urgent BKOPS bit is set in a R1 command response
307 * then background operations should be started immediately.
309 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
313 bool use_busy_signal;
317 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
320 err = mmc_read_bkops_status(card);
322 pr_err("%s: Failed to read bkops status: %d\n",
323 mmc_hostname(card->host), err);
327 if (!card->ext_csd.raw_bkops_status)
330 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
334 mmc_claim_host(card->host);
335 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
336 timeout = MMC_BKOPS_MAX_TIMEOUT;
337 use_busy_signal = true;
340 use_busy_signal = false;
343 mmc_retune_hold(card->host);
345 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
346 EXT_CSD_BKOPS_START, 1, timeout,
347 use_busy_signal, true, false);
349 pr_warn("%s: Error %d starting bkops\n",
350 mmc_hostname(card->host), err);
351 mmc_retune_release(card->host);
356 * For urgent bkops status (LEVEL_2 and more)
357 * bkops executed synchronously, otherwise
358 * the operation is in progress
360 if (!use_busy_signal)
361 mmc_card_set_doing_bkops(card);
363 mmc_retune_release(card->host);
365 mmc_release_host(card->host);
367 EXPORT_SYMBOL(mmc_start_bkops);
370 * mmc_wait_data_done() - done callback for data request
371 * @mrq: done data request
373 * Wakes up mmc context, passed as a callback to host controller driver
375 static void mmc_wait_data_done(struct mmc_request *mrq)
377 struct mmc_context_info *context_info = &mrq->host->context_info;
379 context_info->is_done_rcv = true;
380 wake_up_interruptible(&context_info->wait);
383 static void mmc_wait_done(struct mmc_request *mrq)
385 complete(&mrq->completion);
389 *__mmc_start_data_req() - starts data request
390 * @host: MMC host to start the request
391 * @mrq: data request to start
393 * Sets the done callback to be called when request is completed by the card.
394 * Starts data mmc request execution
396 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
400 mrq->done = mmc_wait_data_done;
403 err = mmc_start_request(host, mrq);
405 mrq->cmd->error = err;
406 mmc_wait_data_done(mrq);
412 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
416 init_completion(&mrq->completion);
417 mrq->done = mmc_wait_done;
419 err = mmc_start_request(host, mrq);
421 mrq->cmd->error = err;
422 complete(&mrq->completion);
429 * mmc_wait_for_data_req_done() - wait for request completed
430 * @host: MMC host to prepare the command.
431 * @mrq: MMC request to wait for
433 * Blocks MMC context till host controller will ack end of data request
434 * execution or new request notification arrives from the block layer.
435 * Handles command retries.
437 * Returns enum mmc_blk_status after checking errors.
439 static int mmc_wait_for_data_req_done(struct mmc_host *host,
440 struct mmc_request *mrq,
441 struct mmc_async_req *next_req)
443 struct mmc_command *cmd;
444 struct mmc_context_info *context_info = &host->context_info;
449 wait_event_interruptible(context_info->wait,
450 (context_info->is_done_rcv ||
451 context_info->is_new_req));
452 spin_lock_irqsave(&context_info->lock, flags);
453 context_info->is_waiting_last_req = false;
454 spin_unlock_irqrestore(&context_info->lock, flags);
455 if (context_info->is_done_rcv) {
456 context_info->is_done_rcv = false;
457 context_info->is_new_req = false;
460 if (!cmd->error || !cmd->retries ||
461 mmc_card_removed(host->card)) {
462 err = host->areq->err_check(host->card,
464 break; /* return err */
466 mmc_retune_recheck(host);
467 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
469 cmd->opcode, cmd->error);
472 __mmc_start_request(host, mrq);
473 continue; /* wait for done/new event again */
475 } else if (context_info->is_new_req) {
476 context_info->is_new_req = false;
478 return MMC_BLK_NEW_REQUEST;
481 mmc_retune_release(host);
485 static void mmc_wait_for_req_done(struct mmc_host *host,
486 struct mmc_request *mrq)
488 struct mmc_command *cmd;
491 wait_for_completion(&mrq->completion);
496 * If host has timed out waiting for the sanitize
497 * to complete, card might be still in programming state
498 * so let's try to bring the card out of programming
501 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
502 if (!mmc_interrupt_hpi(host->card)) {
503 pr_warn("%s: %s: Interrupted sanitize\n",
504 mmc_hostname(host), __func__);
508 pr_err("%s: %s: Failed to interrupt sanitize\n",
509 mmc_hostname(host), __func__);
512 if (!cmd->error || !cmd->retries ||
513 mmc_card_removed(host->card))
516 mmc_retune_recheck(host);
518 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
519 mmc_hostname(host), cmd->opcode, cmd->error);
522 __mmc_start_request(host, mrq);
525 mmc_retune_release(host);
529 * mmc_pre_req - Prepare for a new request
530 * @host: MMC host to prepare command
531 * @mrq: MMC request to prepare for
532 * @is_first_req: true if there is no previous started request
533 * that may run in parellel to this call, otherwise false
535 * mmc_pre_req() is called in prior to mmc_start_req() to let
536 * host prepare for the new request. Preparation of a request may be
537 * performed while another request is running on the host.
539 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
542 if (host->ops->pre_req)
543 host->ops->pre_req(host, mrq, is_first_req);
547 * mmc_post_req - Post process a completed request
548 * @host: MMC host to post process command
549 * @mrq: MMC request to post process for
550 * @err: Error, if non zero, clean up any resources made in pre_req
552 * Let the host post process a completed request. Post processing of
553 * a request may be performed while another reuqest is running.
555 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
558 if (host->ops->post_req)
559 host->ops->post_req(host, mrq, err);
563 * mmc_start_req - start a non-blocking request
564 * @host: MMC host to start command
565 * @areq: async request to start
566 * @error: out parameter returns 0 for success, otherwise non zero
568 * Start a new MMC custom command request for a host.
569 * If there is on ongoing async request wait for completion
570 * of that request and start the new one and return.
571 * Does not wait for the new request to complete.
573 * Returns the completed request, NULL in case of none completed.
574 * Wait for the an ongoing request (previoulsy started) to complete and
575 * return the completed request. If there is no ongoing request, NULL
576 * is returned without waiting. NULL is not an error condition.
578 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
579 struct mmc_async_req *areq, int *error)
583 struct mmc_async_req *data = host->areq;
585 /* Prepare a new request */
587 mmc_pre_req(host, areq->mrq, !host->areq);
590 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
591 if (err == MMC_BLK_NEW_REQUEST) {
595 * The previous request was not completed,
601 * Check BKOPS urgency for each R1 response
603 if (host->card && mmc_card_mmc(host->card) &&
604 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
605 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
606 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
608 /* Cancel the prepared request */
610 mmc_post_req(host, areq->mrq, -EINVAL);
612 mmc_start_bkops(host->card, true);
614 /* prepare the request again */
616 mmc_pre_req(host, areq->mrq, !host->areq);
621 start_err = __mmc_start_data_req(host, areq->mrq);
624 mmc_post_req(host, host->areq->mrq, 0);
626 /* Cancel a prepared request if it was not started. */
627 if ((err || start_err) && areq)
628 mmc_post_req(host, areq->mrq, -EINVAL);
639 EXPORT_SYMBOL(mmc_start_req);
642 * mmc_wait_for_req - start a request and wait for completion
643 * @host: MMC host to start command
644 * @mrq: MMC request to start
646 * Start a new MMC custom command request for a host, and wait
647 * for the command to complete. Does not attempt to parse the
650 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
652 __mmc_start_req(host, mrq);
653 mmc_wait_for_req_done(host, mrq);
655 EXPORT_SYMBOL(mmc_wait_for_req);
658 * mmc_interrupt_hpi - Issue for High priority Interrupt
659 * @card: the MMC card associated with the HPI transfer
661 * Issued High Priority Interrupt, and check for card status
662 * until out-of prg-state.
664 int mmc_interrupt_hpi(struct mmc_card *card)
668 unsigned long prg_wait;
672 if (!card->ext_csd.hpi_en) {
673 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
677 mmc_claim_host(card->host);
678 err = mmc_send_status(card, &status);
680 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
684 switch (R1_CURRENT_STATE(status)) {
690 * In idle and transfer states, HPI is not needed and the caller
691 * can issue the next intended command immediately
697 /* In all other states, it's illegal to issue HPI */
698 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
699 mmc_hostname(card->host), R1_CURRENT_STATE(status));
704 err = mmc_send_hpi_cmd(card, &status);
708 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
710 err = mmc_send_status(card, &status);
712 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
714 if (time_after(jiffies, prg_wait))
719 mmc_release_host(card->host);
722 EXPORT_SYMBOL(mmc_interrupt_hpi);
725 * mmc_wait_for_cmd - start a command and wait for completion
726 * @host: MMC host to start command
727 * @cmd: MMC command to start
728 * @retries: maximum number of retries
730 * Start a new MMC command for a host, and wait for the command
731 * to complete. Return any error that occurred while the command
732 * was executing. Do not attempt to parse the response.
734 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
736 struct mmc_request mrq = {NULL};
738 WARN_ON(!host->claimed);
740 memset(cmd->resp, 0, sizeof(cmd->resp));
741 cmd->retries = retries;
746 mmc_wait_for_req(host, &mrq);
751 EXPORT_SYMBOL(mmc_wait_for_cmd);
754 * mmc_stop_bkops - stop ongoing BKOPS
755 * @card: MMC card to check BKOPS
757 * Send HPI command to stop ongoing background operations to
758 * allow rapid servicing of foreground operations, e.g. read/
759 * writes. Wait until the card comes out of the programming state
760 * to avoid errors in servicing read/write requests.
762 int mmc_stop_bkops(struct mmc_card *card)
767 err = mmc_interrupt_hpi(card);
770 * If err is EINVAL, we can't issue an HPI.
771 * It should complete the BKOPS.
773 if (!err || (err == -EINVAL)) {
774 mmc_card_clr_doing_bkops(card);
775 mmc_retune_release(card->host);
781 EXPORT_SYMBOL(mmc_stop_bkops);
783 int mmc_read_bkops_status(struct mmc_card *card)
788 mmc_claim_host(card->host);
789 err = mmc_get_ext_csd(card, &ext_csd);
790 mmc_release_host(card->host);
794 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
795 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
799 EXPORT_SYMBOL(mmc_read_bkops_status);
802 * mmc_set_data_timeout - set the timeout for a data command
803 * @data: data phase for command
804 * @card: the MMC card associated with the data transfer
806 * Computes the data timeout parameters according to the
807 * correct algorithm given the card type.
809 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
814 * SDIO cards only define an upper 1 s limit on access.
816 if (mmc_card_sdio(card)) {
817 data->timeout_ns = 1000000000;
818 data->timeout_clks = 0;
823 * SD cards use a 100 multiplier rather than 10
825 mult = mmc_card_sd(card) ? 100 : 10;
828 * Scale up the multiplier (and therefore the timeout) by
829 * the r2w factor for writes.
831 if (data->flags & MMC_DATA_WRITE)
832 mult <<= card->csd.r2w_factor;
834 data->timeout_ns = card->csd.tacc_ns * mult;
835 data->timeout_clks = card->csd.tacc_clks * mult;
838 * SD cards also have an upper limit on the timeout.
840 if (mmc_card_sd(card)) {
841 unsigned int timeout_us, limit_us;
843 timeout_us = data->timeout_ns / 1000;
844 if (card->host->ios.clock)
845 timeout_us += data->timeout_clks * 1000 /
846 (card->host->ios.clock / 1000);
848 if (data->flags & MMC_DATA_WRITE)
850 * The MMC spec "It is strongly recommended
851 * for hosts to implement more than 500ms
852 * timeout value even if the card indicates
853 * the 250ms maximum busy length." Even the
854 * previous value of 300ms is known to be
855 * insufficient for some cards.
862 * SDHC cards always use these fixed values.
864 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
865 data->timeout_ns = limit_us * 1000;
866 data->timeout_clks = 0;
869 /* assign limit value if invalid */
871 data->timeout_ns = limit_us * 1000;
875 * Some cards require longer data read timeout than indicated in CSD.
876 * Address this by setting the read timeout to a "reasonably high"
877 * value. For the cards tested, 300ms has proven enough. If necessary,
878 * this value can be increased if other problematic cards require this.
880 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
881 data->timeout_ns = 300000000;
882 data->timeout_clks = 0;
886 * Some cards need very high timeouts if driven in SPI mode.
887 * The worst observed timeout was 900ms after writing a
888 * continuous stream of data until the internal logic
891 if (mmc_host_is_spi(card->host)) {
892 if (data->flags & MMC_DATA_WRITE) {
893 if (data->timeout_ns < 1000000000)
894 data->timeout_ns = 1000000000; /* 1s */
896 if (data->timeout_ns < 100000000)
897 data->timeout_ns = 100000000; /* 100ms */
901 EXPORT_SYMBOL(mmc_set_data_timeout);
904 * mmc_align_data_size - pads a transfer size to a more optimal value
905 * @card: the MMC card associated with the data transfer
906 * @sz: original transfer size
908 * Pads the original data size with a number of extra bytes in
909 * order to avoid controller bugs and/or performance hits
910 * (e.g. some controllers revert to PIO for certain sizes).
912 * Returns the improved size, which might be unmodified.
914 * Note that this function is only relevant when issuing a
915 * single scatter gather entry.
917 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
920 * FIXME: We don't have a system for the controller to tell
921 * the core about its problems yet, so for now we just 32-bit
924 sz = ((sz + 3) / 4) * 4;
928 EXPORT_SYMBOL(mmc_align_data_size);
931 * __mmc_claim_host - exclusively claim a host
932 * @host: mmc host to claim
933 * @abort: whether or not the operation should be aborted
935 * Claim a host for a set of operations. If @abort is non null and
936 * dereference a non-zero value then this will return prematurely with
937 * that non-zero value without acquiring the lock. Returns zero
938 * with the lock held otherwise.
940 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
942 DECLARE_WAITQUEUE(wait, current);
949 add_wait_queue(&host->wq, &wait);
950 spin_lock_irqsave(&host->lock, flags);
952 set_current_state(TASK_UNINTERRUPTIBLE);
953 stop = abort ? atomic_read(abort) : 0;
954 if (stop || !host->claimed || host->claimer == current)
956 spin_unlock_irqrestore(&host->lock, flags);
958 spin_lock_irqsave(&host->lock, flags);
960 set_current_state(TASK_RUNNING);
963 host->claimer = current;
964 host->claim_cnt += 1;
965 if (host->claim_cnt == 1)
969 spin_unlock_irqrestore(&host->lock, flags);
970 remove_wait_queue(&host->wq, &wait);
973 pm_runtime_get_sync(mmc_dev(host));
977 EXPORT_SYMBOL(__mmc_claim_host);
980 * mmc_release_host - release a host
981 * @host: mmc host to release
983 * Release a MMC host, allowing others to claim the host
984 * for their operations.
986 void mmc_release_host(struct mmc_host *host)
990 WARN_ON(!host->claimed);
992 spin_lock_irqsave(&host->lock, flags);
993 if (--host->claim_cnt) {
994 /* Release for nested claim */
995 spin_unlock_irqrestore(&host->lock, flags);
998 host->claimer = NULL;
999 spin_unlock_irqrestore(&host->lock, flags);
1001 pm_runtime_mark_last_busy(mmc_dev(host));
1002 pm_runtime_put_autosuspend(mmc_dev(host));
1005 EXPORT_SYMBOL(mmc_release_host);
1008 * This is a helper function, which fetches a runtime pm reference for the
1009 * card device and also claims the host.
1011 void mmc_get_card(struct mmc_card *card)
1013 pm_runtime_get_sync(&card->dev);
1014 mmc_claim_host(card->host);
1016 EXPORT_SYMBOL(mmc_get_card);
1019 * This is a helper function, which releases the host and drops the runtime
1020 * pm reference for the card device.
1022 void mmc_put_card(struct mmc_card *card)
1024 mmc_release_host(card->host);
1025 pm_runtime_mark_last_busy(&card->dev);
1026 pm_runtime_put_autosuspend(&card->dev);
1028 EXPORT_SYMBOL(mmc_put_card);
1031 * Internal function that does the actual ios call to the host driver,
1032 * optionally printing some debug output.
1034 static inline void mmc_set_ios(struct mmc_host *host)
1036 struct mmc_ios *ios = &host->ios;
1038 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1039 "width %u timing %u\n",
1040 mmc_hostname(host), ios->clock, ios->bus_mode,
1041 ios->power_mode, ios->chip_select, ios->vdd,
1042 ios->bus_width, ios->timing);
1044 host->ops->set_ios(host, ios);
1048 * Control chip select pin on a host.
1050 void mmc_set_chip_select(struct mmc_host *host, int mode)
1052 host->ios.chip_select = mode;
1057 * Sets the host clock to the highest possible frequency that
1060 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1062 WARN_ON(hz && hz < host->f_min);
1064 if (hz > host->f_max)
1067 host->ios.clock = hz;
1071 int mmc_execute_tuning(struct mmc_card *card)
1073 struct mmc_host *host = card->host;
1077 if (!host->ops->execute_tuning)
1080 if (mmc_card_mmc(card))
1081 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1083 opcode = MMC_SEND_TUNING_BLOCK;
1085 err = host->ops->execute_tuning(host, opcode);
1088 pr_err("%s: tuning execution failed\n", mmc_hostname(host));
1090 mmc_retune_enable(host);
1096 * Change the bus mode (open drain/push-pull) of a host.
1098 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1100 host->ios.bus_mode = mode;
1105 * Change data bus width of a host.
1107 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1109 host->ios.bus_width = width;
1114 * Set initial state after a power cycle or a hw_reset.
1116 void mmc_set_initial_state(struct mmc_host *host)
1118 mmc_retune_disable(host);
1120 if (mmc_host_is_spi(host))
1121 host->ios.chip_select = MMC_CS_HIGH;
1123 host->ios.chip_select = MMC_CS_DONTCARE;
1124 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1125 host->ios.bus_width = MMC_BUS_WIDTH_1;
1126 host->ios.timing = MMC_TIMING_LEGACY;
1127 host->ios.drv_type = 0;
1133 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1134 * @vdd: voltage (mV)
1135 * @low_bits: prefer low bits in boundary cases
1137 * This function returns the OCR bit number according to the provided @vdd
1138 * value. If conversion is not possible a negative errno value returned.
1140 * Depending on the @low_bits flag the function prefers low or high OCR bits
1141 * on boundary voltages. For example,
1142 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1143 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1145 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1147 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1149 const int max_bit = ilog2(MMC_VDD_35_36);
1152 if (vdd < 1650 || vdd > 3600)
1155 if (vdd >= 1650 && vdd <= 1950)
1156 return ilog2(MMC_VDD_165_195);
1161 /* Base 2000 mV, step 100 mV, bit's base 8. */
1162 bit = (vdd - 2000) / 100 + 8;
1169 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1170 * @vdd_min: minimum voltage value (mV)
1171 * @vdd_max: maximum voltage value (mV)
1173 * This function returns the OCR mask bits according to the provided @vdd_min
1174 * and @vdd_max values. If conversion is not possible the function returns 0.
1176 * Notes wrt boundary cases:
1177 * This function sets the OCR bits for all boundary voltages, for example
1178 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1179 * MMC_VDD_34_35 mask.
1181 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1185 if (vdd_max < vdd_min)
1188 /* Prefer high bits for the boundary vdd_max values. */
1189 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1193 /* Prefer low bits for the boundary vdd_min values. */
1194 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1198 /* Fill the mask, from max bit to min bit. */
1199 while (vdd_max >= vdd_min)
1200 mask |= 1 << vdd_max--;
1204 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1209 * mmc_of_parse_voltage - return mask of supported voltages
1210 * @np: The device node need to be parsed.
1211 * @mask: mask of voltages available for MMC/SD/SDIO
1213 * 1. Return zero on success.
1214 * 2. Return negative errno: voltage-range is invalid.
1216 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1218 const u32 *voltage_ranges;
1221 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1222 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1223 if (!voltage_ranges || !num_ranges) {
1224 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1228 for (i = 0; i < num_ranges; i++) {
1229 const int j = i * 2;
1232 ocr_mask = mmc_vddrange_to_ocrmask(
1233 be32_to_cpu(voltage_ranges[j]),
1234 be32_to_cpu(voltage_ranges[j + 1]));
1236 pr_err("%s: voltage-range #%d is invalid\n",
1245 EXPORT_SYMBOL(mmc_of_parse_voltage);
1247 #endif /* CONFIG_OF */
1249 static int mmc_of_get_func_num(struct device_node *node)
1254 ret = of_property_read_u32(node, "reg", ®);
1261 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1264 struct device_node *node;
1266 if (!host->parent || !host->parent->of_node)
1269 for_each_child_of_node(host->parent->of_node, node) {
1270 if (mmc_of_get_func_num(node) == func_num)
1277 #ifdef CONFIG_REGULATOR
1280 * mmc_regulator_get_ocrmask - return mask of supported voltages
1281 * @supply: regulator to use
1283 * This returns either a negative errno, or a mask of voltages that
1284 * can be provided to MMC/SD/SDIO devices using the specified voltage
1285 * regulator. This would normally be called before registering the
1288 int mmc_regulator_get_ocrmask(struct regulator *supply)
1296 count = regulator_count_voltages(supply);
1300 for (i = 0; i < count; i++) {
1301 vdd_uV = regulator_list_voltage(supply, i);
1305 vdd_mV = vdd_uV / 1000;
1306 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1310 vdd_uV = regulator_get_voltage(supply);
1314 vdd_mV = vdd_uV / 1000;
1315 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1320 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1323 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1324 * @mmc: the host to regulate
1325 * @supply: regulator to use
1326 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1328 * Returns zero on success, else negative errno.
1330 * MMC host drivers may use this to enable or disable a regulator using
1331 * a particular supply voltage. This would normally be called from the
1334 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1335 struct regulator *supply,
1336 unsigned short vdd_bit)
1345 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1346 * bits this regulator doesn't quite support ... don't
1347 * be too picky, most cards and regulators are OK with
1348 * a 0.1V range goof (it's a small error percentage).
1350 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1352 min_uV = 1650 * 1000;
1353 max_uV = 1950 * 1000;
1355 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1356 max_uV = min_uV + 100 * 1000;
1359 result = regulator_set_voltage(supply, min_uV, max_uV);
1360 if (result == 0 && !mmc->regulator_enabled) {
1361 result = regulator_enable(supply);
1363 mmc->regulator_enabled = true;
1365 } else if (mmc->regulator_enabled) {
1366 result = regulator_disable(supply);
1368 mmc->regulator_enabled = false;
1372 dev_err(mmc_dev(mmc),
1373 "could not set regulator OCR (%d)\n", result);
1376 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1378 #endif /* CONFIG_REGULATOR */
1380 int mmc_regulator_get_supply(struct mmc_host *mmc)
1382 struct device *dev = mmc_dev(mmc);
1385 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1386 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1388 if (IS_ERR(mmc->supply.vmmc)) {
1389 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1390 return -EPROBE_DEFER;
1391 dev_info(dev, "No vmmc regulator found\n");
1393 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1395 mmc->ocr_avail = ret;
1397 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1400 if (IS_ERR(mmc->supply.vqmmc)) {
1401 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1402 return -EPROBE_DEFER;
1403 dev_info(dev, "No vqmmc regulator found\n");
1408 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1411 * Mask off any voltages we don't support and select
1412 * the lowest voltage
1414 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1419 * Sanity check the voltages that the card claims to
1423 dev_warn(mmc_dev(host),
1424 "card claims to support voltages below defined range\n");
1428 ocr &= host->ocr_avail;
1430 dev_warn(mmc_dev(host), "no support for card's volts\n");
1434 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1437 mmc_power_cycle(host, ocr);
1441 if (bit != host->ios.vdd)
1442 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1448 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1451 int old_signal_voltage = host->ios.signal_voltage;
1453 host->ios.signal_voltage = signal_voltage;
1454 if (host->ops->start_signal_voltage_switch)
1455 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1458 host->ios.signal_voltage = old_signal_voltage;
1464 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1466 struct mmc_command cmd = {0};
1473 * Send CMD11 only if the request is to switch the card to
1476 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1477 return __mmc_set_signal_voltage(host, signal_voltage);
1480 * If we cannot switch voltages, return failure so the caller
1481 * can continue without UHS mode
1483 if (!host->ops->start_signal_voltage_switch)
1485 if (!host->ops->card_busy)
1486 pr_warn("%s: cannot verify signal voltage switch\n",
1487 mmc_hostname(host));
1489 cmd.opcode = SD_SWITCH_VOLTAGE;
1491 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1493 err = mmc_wait_for_cmd(host, &cmd, 0);
1497 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1501 * The card should drive cmd and dat[0:3] low immediately
1502 * after the response of cmd11, but wait 1 ms to be sure
1505 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1510 * During a signal voltage level switch, the clock must be gated
1511 * for 5 ms according to the SD spec
1513 clock = host->ios.clock;
1514 host->ios.clock = 0;
1517 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1519 * Voltages may not have been switched, but we've already
1520 * sent CMD11, so a power cycle is required anyway
1526 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1528 host->ios.clock = clock;
1531 /* Wait for at least 1 ms according to spec */
1535 * Failure to switch is indicated by the card holding
1538 if (host->ops->card_busy && host->ops->card_busy(host))
1543 pr_debug("%s: Signal voltage switch failed, "
1544 "power cycling card\n", mmc_hostname(host));
1545 mmc_power_cycle(host, ocr);
1552 * Select timing parameters for host.
1554 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1556 host->ios.timing = timing;
1561 * Select appropriate driver type for host.
1563 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1565 host->ios.drv_type = drv_type;
1569 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1570 int card_drv_type, int *drv_type)
1572 struct mmc_host *host = card->host;
1573 int host_drv_type = SD_DRIVER_TYPE_B;
1577 if (!host->ops->select_drive_strength)
1580 /* Use SD definition of driver strength for hosts */
1581 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1582 host_drv_type |= SD_DRIVER_TYPE_A;
1584 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1585 host_drv_type |= SD_DRIVER_TYPE_C;
1587 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1588 host_drv_type |= SD_DRIVER_TYPE_D;
1591 * The drive strength that the hardware can support
1592 * depends on the board design. Pass the appropriate
1593 * information and let the hardware specific code
1594 * return what is possible given the options
1596 return host->ops->select_drive_strength(card, max_dtr,
1603 * Apply power to the MMC stack. This is a two-stage process.
1604 * First, we enable power to the card without the clock running.
1605 * We then wait a bit for the power to stabilise. Finally,
1606 * enable the bus drivers and clock to the card.
1608 * We must _NOT_ enable the clock prior to power stablising.
1610 * If a host does all the power sequencing itself, ignore the
1611 * initial MMC_POWER_UP stage.
1613 void mmc_power_up(struct mmc_host *host, u32 ocr)
1615 if (host->ios.power_mode == MMC_POWER_ON)
1618 mmc_pwrseq_pre_power_on(host);
1620 host->ios.vdd = fls(ocr) - 1;
1621 host->ios.power_mode = MMC_POWER_UP;
1622 /* Set initial state and call mmc_set_ios */
1623 mmc_set_initial_state(host);
1625 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1626 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1627 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1628 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1629 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1630 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1631 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1634 * This delay should be sufficient to allow the power supply
1635 * to reach the minimum voltage.
1639 mmc_pwrseq_post_power_on(host);
1641 host->ios.clock = host->f_init;
1643 host->ios.power_mode = MMC_POWER_ON;
1647 * This delay must be at least 74 clock sizes, or 1 ms, or the
1648 * time required to reach a stable voltage.
1653 void mmc_power_off(struct mmc_host *host)
1655 if (host->ios.power_mode == MMC_POWER_OFF)
1658 mmc_pwrseq_power_off(host);
1660 host->ios.clock = 0;
1663 host->ios.power_mode = MMC_POWER_OFF;
1664 /* Set initial state and call mmc_set_ios */
1665 mmc_set_initial_state(host);
1668 * Some configurations, such as the 802.11 SDIO card in the OLPC
1669 * XO-1.5, require a short delay after poweroff before the card
1670 * can be successfully turned on again.
1675 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1677 mmc_power_off(host);
1678 /* Wait at least 1 ms according to SD spec */
1680 mmc_power_up(host, ocr);
1684 * Cleanup when the last reference to the bus operator is dropped.
1686 static void __mmc_release_bus(struct mmc_host *host)
1689 BUG_ON(host->bus_refs);
1690 BUG_ON(!host->bus_dead);
1692 host->bus_ops = NULL;
1696 * Increase reference count of bus operator
1698 static inline void mmc_bus_get(struct mmc_host *host)
1700 unsigned long flags;
1702 spin_lock_irqsave(&host->lock, flags);
1704 spin_unlock_irqrestore(&host->lock, flags);
1708 * Decrease reference count of bus operator and free it if
1709 * it is the last reference.
1711 static inline void mmc_bus_put(struct mmc_host *host)
1713 unsigned long flags;
1715 spin_lock_irqsave(&host->lock, flags);
1717 if ((host->bus_refs == 0) && host->bus_ops)
1718 __mmc_release_bus(host);
1719 spin_unlock_irqrestore(&host->lock, flags);
1723 * Assign a mmc bus handler to a host. Only one bus handler may control a
1724 * host at any given time.
1726 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1728 unsigned long flags;
1733 WARN_ON(!host->claimed);
1735 spin_lock_irqsave(&host->lock, flags);
1737 BUG_ON(host->bus_ops);
1738 BUG_ON(host->bus_refs);
1740 host->bus_ops = ops;
1744 spin_unlock_irqrestore(&host->lock, flags);
1748 * Remove the current bus handler from a host.
1750 void mmc_detach_bus(struct mmc_host *host)
1752 unsigned long flags;
1756 WARN_ON(!host->claimed);
1757 WARN_ON(!host->bus_ops);
1759 spin_lock_irqsave(&host->lock, flags);
1763 spin_unlock_irqrestore(&host->lock, flags);
1768 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1771 #ifdef CONFIG_MMC_DEBUG
1772 unsigned long flags;
1773 spin_lock_irqsave(&host->lock, flags);
1774 WARN_ON(host->removed);
1775 spin_unlock_irqrestore(&host->lock, flags);
1779 * If the device is configured as wakeup, we prevent a new sleep for
1780 * 5 s to give provision for user space to consume the event.
1782 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1783 device_can_wakeup(mmc_dev(host)))
1784 pm_wakeup_event(mmc_dev(host), 5000);
1786 host->detect_change = 1;
1787 mmc_schedule_delayed_work(&host->detect, delay);
1791 * mmc_detect_change - process change of state on a MMC socket
1792 * @host: host which changed state.
1793 * @delay: optional delay to wait before detection (jiffies)
1795 * MMC drivers should call this when they detect a card has been
1796 * inserted or removed. The MMC layer will confirm that any
1797 * present card is still functional, and initialize any newly
1800 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1802 _mmc_detect_change(host, delay, true);
1804 EXPORT_SYMBOL(mmc_detect_change);
1806 void mmc_init_erase(struct mmc_card *card)
1810 if (is_power_of_2(card->erase_size))
1811 card->erase_shift = ffs(card->erase_size) - 1;
1813 card->erase_shift = 0;
1816 * It is possible to erase an arbitrarily large area of an SD or MMC
1817 * card. That is not desirable because it can take a long time
1818 * (minutes) potentially delaying more important I/O, and also the
1819 * timeout calculations become increasingly hugely over-estimated.
1820 * Consequently, 'pref_erase' is defined as a guide to limit erases
1821 * to that size and alignment.
1823 * For SD cards that define Allocation Unit size, limit erases to one
1824 * Allocation Unit at a time. For MMC cards that define High Capacity
1825 * Erase Size, whether it is switched on or not, limit to that size.
1826 * Otherwise just have a stab at a good value. For modern cards it
1827 * will end up being 4MiB. Note that if the value is too small, it
1828 * can end up taking longer to erase.
1830 if (mmc_card_sd(card) && card->ssr.au) {
1831 card->pref_erase = card->ssr.au;
1832 card->erase_shift = ffs(card->ssr.au) - 1;
1833 } else if (card->ext_csd.hc_erase_size) {
1834 card->pref_erase = card->ext_csd.hc_erase_size;
1835 } else if (card->erase_size) {
1836 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1838 card->pref_erase = 512 * 1024 / 512;
1840 card->pref_erase = 1024 * 1024 / 512;
1842 card->pref_erase = 2 * 1024 * 1024 / 512;
1844 card->pref_erase = 4 * 1024 * 1024 / 512;
1845 if (card->pref_erase < card->erase_size)
1846 card->pref_erase = card->erase_size;
1848 sz = card->pref_erase % card->erase_size;
1850 card->pref_erase += card->erase_size - sz;
1853 card->pref_erase = 0;
1856 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1857 unsigned int arg, unsigned int qty)
1859 unsigned int erase_timeout;
1861 if (arg == MMC_DISCARD_ARG ||
1862 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1863 erase_timeout = card->ext_csd.trim_timeout;
1864 } else if (card->ext_csd.erase_group_def & 1) {
1865 /* High Capacity Erase Group Size uses HC timeouts */
1866 if (arg == MMC_TRIM_ARG)
1867 erase_timeout = card->ext_csd.trim_timeout;
1869 erase_timeout = card->ext_csd.hc_erase_timeout;
1871 /* CSD Erase Group Size uses write timeout */
1872 unsigned int mult = (10 << card->csd.r2w_factor);
1873 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1874 unsigned int timeout_us;
1876 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1877 if (card->csd.tacc_ns < 1000000)
1878 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1880 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1883 * ios.clock is only a target. The real clock rate might be
1884 * less but not that much less, so fudge it by multiplying by 2.
1887 timeout_us += (timeout_clks * 1000) /
1888 (card->host->ios.clock / 1000);
1890 erase_timeout = timeout_us / 1000;
1893 * Theoretically, the calculation could underflow so round up
1894 * to 1ms in that case.
1900 /* Multiplier for secure operations */
1901 if (arg & MMC_SECURE_ARGS) {
1902 if (arg == MMC_SECURE_ERASE_ARG)
1903 erase_timeout *= card->ext_csd.sec_erase_mult;
1905 erase_timeout *= card->ext_csd.sec_trim_mult;
1908 erase_timeout *= qty;
1911 * Ensure at least a 1 second timeout for SPI as per
1912 * 'mmc_set_data_timeout()'
1914 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1915 erase_timeout = 1000;
1917 return erase_timeout;
1920 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1924 unsigned int erase_timeout;
1926 if (card->ssr.erase_timeout) {
1927 /* Erase timeout specified in SD Status Register (SSR) */
1928 erase_timeout = card->ssr.erase_timeout * qty +
1929 card->ssr.erase_offset;
1932 * Erase timeout not specified in SD Status Register (SSR) so
1933 * use 250ms per write block.
1935 erase_timeout = 250 * qty;
1938 /* Must not be less than 1 second */
1939 if (erase_timeout < 1000)
1940 erase_timeout = 1000;
1942 return erase_timeout;
1945 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1949 if (mmc_card_sd(card))
1950 return mmc_sd_erase_timeout(card, arg, qty);
1952 return mmc_mmc_erase_timeout(card, arg, qty);
1955 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1956 unsigned int to, unsigned int arg)
1958 struct mmc_command cmd = {0};
1959 unsigned int qty = 0;
1960 unsigned long timeout;
1963 mmc_retune_hold(card->host);
1966 * qty is used to calculate the erase timeout which depends on how many
1967 * erase groups (or allocation units in SD terminology) are affected.
1968 * We count erasing part of an erase group as one erase group.
1969 * For SD, the allocation units are always a power of 2. For MMC, the
1970 * erase group size is almost certainly also power of 2, but it does not
1971 * seem to insist on that in the JEDEC standard, so we fall back to
1972 * division in that case. SD may not specify an allocation unit size,
1973 * in which case the timeout is based on the number of write blocks.
1975 * Note that the timeout for secure trim 2 will only be correct if the
1976 * number of erase groups specified is the same as the total of all
1977 * preceding secure trim 1 commands. Since the power may have been
1978 * lost since the secure trim 1 commands occurred, it is generally
1979 * impossible to calculate the secure trim 2 timeout correctly.
1981 if (card->erase_shift)
1982 qty += ((to >> card->erase_shift) -
1983 (from >> card->erase_shift)) + 1;
1984 else if (mmc_card_sd(card))
1985 qty += to - from + 1;
1987 qty += ((to / card->erase_size) -
1988 (from / card->erase_size)) + 1;
1990 if (!mmc_card_blockaddr(card)) {
1995 if (mmc_card_sd(card))
1996 cmd.opcode = SD_ERASE_WR_BLK_START;
1998 cmd.opcode = MMC_ERASE_GROUP_START;
2000 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2001 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2003 pr_err("mmc_erase: group start error %d, "
2004 "status %#x\n", err, cmd.resp[0]);
2009 memset(&cmd, 0, sizeof(struct mmc_command));
2010 if (mmc_card_sd(card))
2011 cmd.opcode = SD_ERASE_WR_BLK_END;
2013 cmd.opcode = MMC_ERASE_GROUP_END;
2015 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2016 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2018 pr_err("mmc_erase: group end error %d, status %#x\n",
2024 memset(&cmd, 0, sizeof(struct mmc_command));
2025 cmd.opcode = MMC_ERASE;
2027 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2028 cmd.busy_timeout = mmc_erase_timeout(card, arg, qty);
2029 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2031 pr_err("mmc_erase: erase error %d, status %#x\n",
2037 if (mmc_host_is_spi(card->host))
2040 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2042 memset(&cmd, 0, sizeof(struct mmc_command));
2043 cmd.opcode = MMC_SEND_STATUS;
2044 cmd.arg = card->rca << 16;
2045 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2046 /* Do not retry else we can't see errors */
2047 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2048 if (err || (cmd.resp[0] & 0xFDF92000)) {
2049 pr_err("error %d requesting status %#x\n",
2055 /* Timeout if the device never becomes ready for data and
2056 * never leaves the program state.
2058 if (time_after(jiffies, timeout)) {
2059 pr_err("%s: Card stuck in programming state! %s\n",
2060 mmc_hostname(card->host), __func__);
2065 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2066 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2068 mmc_retune_release(card->host);
2073 * mmc_erase - erase sectors.
2074 * @card: card to erase
2075 * @from: first sector to erase
2076 * @nr: number of sectors to erase
2077 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2079 * Caller must claim host before calling this function.
2081 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2084 unsigned int rem, to = from + nr;
2087 if (!(card->host->caps & MMC_CAP_ERASE) ||
2088 !(card->csd.cmdclass & CCC_ERASE))
2091 if (!card->erase_size)
2094 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2097 if ((arg & MMC_SECURE_ARGS) &&
2098 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2101 if ((arg & MMC_TRIM_ARGS) &&
2102 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2105 if (arg == MMC_SECURE_ERASE_ARG) {
2106 if (from % card->erase_size || nr % card->erase_size)
2110 if (arg == MMC_ERASE_ARG) {
2111 rem = from % card->erase_size;
2113 rem = card->erase_size - rem;
2120 rem = nr % card->erase_size;
2133 /* 'from' and 'to' are inclusive */
2137 * Special case where only one erase-group fits in the timeout budget:
2138 * If the region crosses an erase-group boundary on this particular
2139 * case, we will be trimming more than one erase-group which, does not
2140 * fit in the timeout budget of the controller, so we need to split it
2141 * and call mmc_do_erase() twice if necessary. This special case is
2142 * identified by the card->eg_boundary flag.
2144 rem = card->erase_size - (from % card->erase_size);
2145 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2146 err = mmc_do_erase(card, from, from + rem - 1, arg);
2148 if ((err) || (to <= from))
2152 return mmc_do_erase(card, from, to, arg);
2154 EXPORT_SYMBOL(mmc_erase);
2156 int mmc_can_erase(struct mmc_card *card)
2158 if ((card->host->caps & MMC_CAP_ERASE) &&
2159 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2163 EXPORT_SYMBOL(mmc_can_erase);
2165 int mmc_can_trim(struct mmc_card *card)
2167 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2168 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2172 EXPORT_SYMBOL(mmc_can_trim);
2174 int mmc_can_discard(struct mmc_card *card)
2177 * As there's no way to detect the discard support bit at v4.5
2178 * use the s/w feature support filed.
2180 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2184 EXPORT_SYMBOL(mmc_can_discard);
2186 int mmc_can_sanitize(struct mmc_card *card)
2188 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2190 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2194 EXPORT_SYMBOL(mmc_can_sanitize);
2196 int mmc_can_secure_erase_trim(struct mmc_card *card)
2198 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2199 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2203 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2205 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2208 if (!card->erase_size)
2210 if (from % card->erase_size || nr % card->erase_size)
2214 EXPORT_SYMBOL(mmc_erase_group_aligned);
2216 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2219 struct mmc_host *host = card->host;
2220 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2221 unsigned int last_timeout = 0;
2223 if (card->erase_shift)
2224 max_qty = UINT_MAX >> card->erase_shift;
2225 else if (mmc_card_sd(card))
2228 max_qty = UINT_MAX / card->erase_size;
2230 /* Find the largest qty with an OK timeout */
2233 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2234 timeout = mmc_erase_timeout(card, arg, qty + x);
2235 if (timeout > host->max_busy_timeout)
2237 if (timeout < last_timeout)
2239 last_timeout = timeout;
2249 * When specifying a sector range to trim, chances are we might cross
2250 * an erase-group boundary even if the amount of sectors is less than
2252 * If we can only fit one erase-group in the controller timeout budget,
2253 * we have to care that erase-group boundaries are not crossed by a
2254 * single trim operation. We flag that special case with "eg_boundary".
2255 * In all other cases we can just decrement qty and pretend that we
2256 * always touch (qty + 1) erase-groups as a simple optimization.
2259 card->eg_boundary = 1;
2263 /* Convert qty to sectors */
2264 if (card->erase_shift)
2265 max_discard = qty << card->erase_shift;
2266 else if (mmc_card_sd(card))
2267 max_discard = qty + 1;
2269 max_discard = qty * card->erase_size;
2274 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2276 struct mmc_host *host = card->host;
2277 unsigned int max_discard, max_trim;
2279 if (!host->max_busy_timeout)
2283 * Without erase_group_def set, MMC erase timeout depends on clock
2284 * frequence which can change. In that case, the best choice is
2285 * just the preferred erase size.
2287 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2288 return card->pref_erase;
2290 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2291 if (mmc_can_trim(card)) {
2292 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2293 if (max_trim < max_discard)
2294 max_discard = max_trim;
2295 } else if (max_discard < card->erase_size) {
2298 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2299 mmc_hostname(host), max_discard, host->max_busy_timeout);
2302 EXPORT_SYMBOL(mmc_calc_max_discard);
2304 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2306 struct mmc_command cmd = {0};
2308 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card))
2311 cmd.opcode = MMC_SET_BLOCKLEN;
2313 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2314 return mmc_wait_for_cmd(card->host, &cmd, 5);
2316 EXPORT_SYMBOL(mmc_set_blocklen);
2318 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2321 struct mmc_command cmd = {0};
2323 cmd.opcode = MMC_SET_BLOCK_COUNT;
2324 cmd.arg = blockcount & 0x0000FFFF;
2327 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2328 return mmc_wait_for_cmd(card->host, &cmd, 5);
2330 EXPORT_SYMBOL(mmc_set_blockcount);
2332 static void mmc_hw_reset_for_init(struct mmc_host *host)
2334 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2336 host->ops->hw_reset(host);
2339 int mmc_hw_reset(struct mmc_host *host)
2347 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2352 ret = host->bus_ops->reset(host);
2355 if (ret != -EOPNOTSUPP)
2356 pr_warn("%s: tried to reset card\n", mmc_hostname(host));
2360 EXPORT_SYMBOL(mmc_hw_reset);
2362 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2364 host->f_init = freq;
2366 #ifdef CONFIG_MMC_DEBUG
2367 pr_info("%s: %s: trying to init card at %u Hz\n",
2368 mmc_hostname(host), __func__, host->f_init);
2370 mmc_power_up(host, host->ocr_avail);
2373 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2374 * do a hardware reset if possible.
2376 mmc_hw_reset_for_init(host);
2379 * sdio_reset sends CMD52 to reset card. Since we do not know
2380 * if the card is being re-initialized, just send it. CMD52
2381 * should be ignored by SD/eMMC cards.
2386 mmc_send_if_cond(host, host->ocr_avail);
2388 /* Order's important: probe SDIO, then SD, then MMC */
2389 if (!mmc_attach_sdio(host))
2391 if (!mmc_attach_sd(host))
2393 if (!mmc_attach_mmc(host))
2396 mmc_power_off(host);
2400 int _mmc_detect_card_removed(struct mmc_host *host)
2404 if (host->caps & MMC_CAP_NONREMOVABLE)
2407 if (!host->card || mmc_card_removed(host->card))
2410 ret = host->bus_ops->alive(host);
2413 * Card detect status and alive check may be out of sync if card is
2414 * removed slowly, when card detect switch changes while card/slot
2415 * pads are still contacted in hardware (refer to "SD Card Mechanical
2416 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2417 * detect work 200ms later for this case.
2419 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2420 mmc_detect_change(host, msecs_to_jiffies(200));
2421 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2425 mmc_card_set_removed(host->card);
2426 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2432 int mmc_detect_card_removed(struct mmc_host *host)
2434 struct mmc_card *card = host->card;
2437 WARN_ON(!host->claimed);
2442 ret = mmc_card_removed(card);
2444 * The card will be considered unchanged unless we have been asked to
2445 * detect a change or host requires polling to provide card detection.
2447 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2450 host->detect_change = 0;
2452 ret = _mmc_detect_card_removed(host);
2453 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2455 * Schedule a detect work as soon as possible to let a
2456 * rescan handle the card removal.
2458 cancel_delayed_work(&host->detect);
2459 _mmc_detect_change(host, 0, false);
2465 EXPORT_SYMBOL(mmc_detect_card_removed);
2467 void mmc_rescan(struct work_struct *work)
2469 struct mmc_host *host =
2470 container_of(work, struct mmc_host, detect.work);
2473 if (host->trigger_card_event && host->ops->card_event) {
2474 host->ops->card_event(host);
2475 host->trigger_card_event = false;
2478 if (host->rescan_disable)
2481 /* If there is a non-removable card registered, only scan once */
2482 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2484 host->rescan_entered = 1;
2489 * if there is a _removable_ card registered, check whether it is
2492 if (host->bus_ops && !host->bus_dead
2493 && !(host->caps & MMC_CAP_NONREMOVABLE))
2494 host->bus_ops->detect(host);
2496 host->detect_change = 0;
2499 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2500 * the card is no longer present.
2505 /* if there still is a card present, stop here */
2506 if (host->bus_ops != NULL) {
2512 * Only we can add a new handler, so it's safe to
2513 * release the lock here.
2517 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2518 host->ops->get_cd(host) == 0) {
2519 mmc_claim_host(host);
2520 mmc_power_off(host);
2521 mmc_release_host(host);
2525 mmc_claim_host(host);
2526 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2527 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2529 if (freqs[i] <= host->f_min)
2532 mmc_release_host(host);
2535 if (host->caps & MMC_CAP_NEEDS_POLL)
2536 mmc_schedule_delayed_work(&host->detect, HZ);
2539 void mmc_start_host(struct mmc_host *host)
2541 host->f_init = max(freqs[0], host->f_min);
2542 host->rescan_disable = 0;
2543 host->ios.power_mode = MMC_POWER_UNDEFINED;
2545 mmc_claim_host(host);
2546 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2547 mmc_power_off(host);
2549 mmc_power_up(host, host->ocr_avail);
2550 mmc_release_host(host);
2552 mmc_gpiod_request_cd_irq(host);
2553 _mmc_detect_change(host, 0, false);
2556 void mmc_stop_host(struct mmc_host *host)
2558 #ifdef CONFIG_MMC_DEBUG
2559 unsigned long flags;
2560 spin_lock_irqsave(&host->lock, flags);
2562 spin_unlock_irqrestore(&host->lock, flags);
2564 if (host->slot.cd_irq >= 0)
2565 disable_irq(host->slot.cd_irq);
2567 host->rescan_disable = 1;
2568 cancel_delayed_work_sync(&host->detect);
2569 mmc_flush_scheduled_work();
2571 /* clear pm flags now and let card drivers set them as needed */
2575 if (host->bus_ops && !host->bus_dead) {
2576 /* Calling bus_ops->remove() with a claimed host can deadlock */
2577 host->bus_ops->remove(host);
2578 mmc_claim_host(host);
2579 mmc_detach_bus(host);
2580 mmc_power_off(host);
2581 mmc_release_host(host);
2589 mmc_claim_host(host);
2590 mmc_power_off(host);
2591 mmc_release_host(host);
2594 int mmc_power_save_host(struct mmc_host *host)
2598 #ifdef CONFIG_MMC_DEBUG
2599 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2604 if (!host->bus_ops || host->bus_dead) {
2609 if (host->bus_ops->power_save)
2610 ret = host->bus_ops->power_save(host);
2614 mmc_power_off(host);
2618 EXPORT_SYMBOL(mmc_power_save_host);
2620 int mmc_power_restore_host(struct mmc_host *host)
2624 #ifdef CONFIG_MMC_DEBUG
2625 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2630 if (!host->bus_ops || host->bus_dead) {
2635 mmc_power_up(host, host->card->ocr);
2636 ret = host->bus_ops->power_restore(host);
2642 EXPORT_SYMBOL(mmc_power_restore_host);
2645 * Flush the cache to the non-volatile storage.
2647 int mmc_flush_cache(struct mmc_card *card)
2651 if (mmc_card_mmc(card) &&
2652 (card->ext_csd.cache_size > 0) &&
2653 (card->ext_csd.cache_ctrl & 1)) {
2654 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2655 EXT_CSD_FLUSH_CACHE, 1, 0);
2657 pr_err("%s: cache flush error %d\n",
2658 mmc_hostname(card->host), err);
2663 EXPORT_SYMBOL(mmc_flush_cache);
2667 /* Do the card removal on suspend if card is assumed removeable
2668 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2671 int mmc_pm_notify(struct notifier_block *notify_block,
2672 unsigned long mode, void *unused)
2674 struct mmc_host *host = container_of(
2675 notify_block, struct mmc_host, pm_notify);
2676 unsigned long flags;
2680 case PM_HIBERNATION_PREPARE:
2681 case PM_SUSPEND_PREPARE:
2682 case PM_RESTORE_PREPARE:
2683 spin_lock_irqsave(&host->lock, flags);
2684 host->rescan_disable = 1;
2685 spin_unlock_irqrestore(&host->lock, flags);
2686 cancel_delayed_work_sync(&host->detect);
2691 /* Validate prerequisites for suspend */
2692 if (host->bus_ops->pre_suspend)
2693 err = host->bus_ops->pre_suspend(host);
2697 /* Calling bus_ops->remove() with a claimed host can deadlock */
2698 host->bus_ops->remove(host);
2699 mmc_claim_host(host);
2700 mmc_detach_bus(host);
2701 mmc_power_off(host);
2702 mmc_release_host(host);
2706 case PM_POST_SUSPEND:
2707 case PM_POST_HIBERNATION:
2708 case PM_POST_RESTORE:
2710 spin_lock_irqsave(&host->lock, flags);
2711 host->rescan_disable = 0;
2712 spin_unlock_irqrestore(&host->lock, flags);
2713 _mmc_detect_change(host, 0, false);
2722 * mmc_init_context_info() - init synchronization context
2725 * Init struct context_info needed to implement asynchronous
2726 * request mechanism, used by mmc core, host driver and mmc requests
2729 void mmc_init_context_info(struct mmc_host *host)
2731 spin_lock_init(&host->context_info.lock);
2732 host->context_info.is_new_req = false;
2733 host->context_info.is_done_rcv = false;
2734 host->context_info.is_waiting_last_req = false;
2735 init_waitqueue_head(&host->context_info.wait);
2738 static int __init mmc_init(void)
2742 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2746 ret = mmc_register_bus();
2748 goto destroy_workqueue;
2750 ret = mmc_register_host_class();
2752 goto unregister_bus;
2754 ret = sdio_register_bus();
2756 goto unregister_host_class;
2760 unregister_host_class:
2761 mmc_unregister_host_class();
2763 mmc_unregister_bus();
2765 destroy_workqueue(workqueue);
2770 static void __exit mmc_exit(void)
2772 sdio_unregister_bus();
2773 mmc_unregister_host_class();
2774 mmc_unregister_bus();
2775 destroy_workqueue(workqueue);
2778 subsys_initcall(mmc_init);
2779 module_exit(mmc_exit);
2781 MODULE_LICENSE("GPL");