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 <trace/events/mmc.h>
35 #include <linux/mmc/card.h>
36 #include <linux/mmc/host.h>
37 #include <linux/mmc/mmc.h>
38 #include <linux/mmc/sd.h>
39 #include <linux/mmc/slot-gpio.h>
51 /* If the device is not responding */
52 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
55 * Background operations can take a long time, depending on the housekeeping
56 * operations the card has to perform.
58 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
60 static struct workqueue_struct *workqueue;
61 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
64 * Enabling software CRCs on the data blocks can be a significant (30%)
65 * performance cost, and for other reasons may not always be desired.
66 * So we allow it it to be disabled.
69 module_param(use_spi_crc, bool, 0);
72 * Internal function. Schedule delayed work in the MMC work queue.
74 static int mmc_schedule_delayed_work(struct delayed_work *work,
77 return queue_delayed_work(workqueue, work, delay);
81 * Internal function. Flush all scheduled work from the MMC work queue.
83 static void mmc_flush_scheduled_work(void)
85 flush_workqueue(workqueue);
88 #ifdef CONFIG_FAIL_MMC_REQUEST
91 * Internal function. Inject random data errors.
92 * If mmc_data is NULL no errors are injected.
94 static void mmc_should_fail_request(struct mmc_host *host,
95 struct mmc_request *mrq)
97 struct mmc_command *cmd = mrq->cmd;
98 struct mmc_data *data = mrq->data;
99 static const int data_errors[] = {
108 if (cmd->error || data->error ||
109 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
112 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
113 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
116 #else /* CONFIG_FAIL_MMC_REQUEST */
118 static inline void mmc_should_fail_request(struct mmc_host *host,
119 struct mmc_request *mrq)
123 #endif /* CONFIG_FAIL_MMC_REQUEST */
126 * mmc_request_done - finish processing an MMC request
127 * @host: MMC host which completed request
128 * @mrq: MMC request which request
130 * MMC drivers should call this function when they have completed
131 * their processing of a request.
133 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
135 struct mmc_command *cmd = mrq->cmd;
136 int err = cmd->error;
138 /* Flag re-tuning needed on CRC errors */
139 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
140 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
141 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
142 (mrq->data && mrq->data->error == -EILSEQ) ||
143 (mrq->stop && mrq->stop->error == -EILSEQ)))
144 mmc_retune_needed(host);
146 if (err && cmd->retries && mmc_host_is_spi(host)) {
147 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
151 if (err && cmd->retries && !mmc_card_removed(host->card)) {
153 * Request starter must handle retries - see
154 * mmc_wait_for_req_done().
159 mmc_should_fail_request(host, mrq);
161 led_trigger_event(host->led, LED_OFF);
164 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
165 mmc_hostname(host), mrq->sbc->opcode,
167 mrq->sbc->resp[0], mrq->sbc->resp[1],
168 mrq->sbc->resp[2], mrq->sbc->resp[3]);
171 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
172 mmc_hostname(host), cmd->opcode, err,
173 cmd->resp[0], cmd->resp[1],
174 cmd->resp[2], cmd->resp[3]);
177 pr_debug("%s: %d bytes transferred: %d\n",
179 mrq->data->bytes_xfered, mrq->data->error);
180 trace_mmc_blk_rw_end(cmd->opcode, cmd->arg, mrq->data);
184 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
185 mmc_hostname(host), mrq->stop->opcode,
187 mrq->stop->resp[0], mrq->stop->resp[1],
188 mrq->stop->resp[2], mrq->stop->resp[3]);
196 EXPORT_SYMBOL(mmc_request_done);
198 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
202 /* Assumes host controller has been runtime resumed by mmc_claim_host */
203 err = mmc_retune(host);
205 mrq->cmd->error = err;
206 mmc_request_done(host, mrq);
211 * For sdio rw commands we must wait for card busy otherwise some
212 * sdio devices won't work properly.
214 if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
215 int tries = 500; /* Wait aprox 500ms at maximum */
217 while (host->ops->card_busy(host) && --tries)
221 mrq->cmd->error = -EBUSY;
222 mmc_request_done(host, mrq);
227 host->ops->request(host, mrq);
230 static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
232 #ifdef CONFIG_MMC_DEBUG
234 struct scatterlist *sg;
236 mmc_retune_hold(host);
238 if (mmc_card_removed(host->card))
242 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
243 mmc_hostname(host), mrq->sbc->opcode,
244 mrq->sbc->arg, mrq->sbc->flags);
247 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
248 mmc_hostname(host), mrq->cmd->opcode,
249 mrq->cmd->arg, mrq->cmd->flags);
252 pr_debug("%s: blksz %d blocks %d flags %08x "
253 "tsac %d ms nsac %d\n",
254 mmc_hostname(host), mrq->data->blksz,
255 mrq->data->blocks, mrq->data->flags,
256 mrq->data->timeout_ns / 1000000,
257 mrq->data->timeout_clks);
261 pr_debug("%s: CMD%u arg %08x flags %08x\n",
262 mmc_hostname(host), mrq->stop->opcode,
263 mrq->stop->arg, mrq->stop->flags);
266 WARN_ON(!host->claimed);
275 BUG_ON(mrq->data->blksz > host->max_blk_size);
276 BUG_ON(mrq->data->blocks > host->max_blk_count);
277 BUG_ON(mrq->data->blocks * mrq->data->blksz >
280 #ifdef CONFIG_MMC_DEBUG
282 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
284 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
287 mrq->cmd->data = mrq->data;
288 mrq->data->error = 0;
289 mrq->data->mrq = mrq;
291 mrq->data->stop = mrq->stop;
292 mrq->stop->error = 0;
293 mrq->stop->mrq = mrq;
296 led_trigger_event(host->led, LED_FULL);
297 __mmc_start_request(host, mrq);
303 * mmc_start_bkops - start BKOPS for supported cards
304 * @card: MMC card to start BKOPS
305 * @form_exception: A flag to indicate if this function was
306 * called due to an exception raised by the card
308 * Start background operations whenever requested.
309 * When the urgent BKOPS bit is set in a R1 command response
310 * then background operations should be started immediately.
312 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
316 bool use_busy_signal;
320 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
323 err = mmc_read_bkops_status(card);
325 pr_err("%s: Failed to read bkops status: %d\n",
326 mmc_hostname(card->host), err);
330 if (!card->ext_csd.raw_bkops_status)
333 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
337 mmc_claim_host(card->host);
338 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
339 timeout = MMC_BKOPS_MAX_TIMEOUT;
340 use_busy_signal = true;
343 use_busy_signal = false;
346 mmc_retune_hold(card->host);
348 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
349 EXT_CSD_BKOPS_START, 1, timeout,
350 use_busy_signal, true, false);
352 pr_warn("%s: Error %d starting bkops\n",
353 mmc_hostname(card->host), err);
354 mmc_retune_release(card->host);
359 * For urgent bkops status (LEVEL_2 and more)
360 * bkops executed synchronously, otherwise
361 * the operation is in progress
363 if (!use_busy_signal)
364 mmc_card_set_doing_bkops(card);
366 mmc_retune_release(card->host);
368 mmc_release_host(card->host);
370 EXPORT_SYMBOL(mmc_start_bkops);
373 * mmc_wait_data_done() - done callback for data request
374 * @mrq: done data request
376 * Wakes up mmc context, passed as a callback to host controller driver
378 static void mmc_wait_data_done(struct mmc_request *mrq)
380 struct mmc_context_info *context_info = &mrq->host->context_info;
382 context_info->is_done_rcv = true;
383 wake_up_interruptible(&context_info->wait);
386 static void mmc_wait_done(struct mmc_request *mrq)
388 complete(&mrq->completion);
392 *__mmc_start_data_req() - starts data request
393 * @host: MMC host to start the request
394 * @mrq: data request to start
396 * Sets the done callback to be called when request is completed by the card.
397 * Starts data mmc request execution
399 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
403 mrq->done = mmc_wait_data_done;
406 err = mmc_start_request(host, mrq);
408 mrq->cmd->error = err;
409 mmc_wait_data_done(mrq);
415 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
419 init_completion(&mrq->completion);
420 mrq->done = mmc_wait_done;
422 err = mmc_start_request(host, mrq);
424 mrq->cmd->error = err;
425 complete(&mrq->completion);
432 * mmc_wait_for_data_req_done() - wait for request completed
433 * @host: MMC host to prepare the command.
434 * @mrq: MMC request to wait for
436 * Blocks MMC context till host controller will ack end of data request
437 * execution or new request notification arrives from the block layer.
438 * Handles command retries.
440 * Returns enum mmc_blk_status after checking errors.
442 static int mmc_wait_for_data_req_done(struct mmc_host *host,
443 struct mmc_request *mrq,
444 struct mmc_async_req *next_req)
446 struct mmc_command *cmd;
447 struct mmc_context_info *context_info = &host->context_info;
452 wait_event_interruptible(context_info->wait,
453 (context_info->is_done_rcv ||
454 context_info->is_new_req));
455 spin_lock_irqsave(&context_info->lock, flags);
456 context_info->is_waiting_last_req = false;
457 spin_unlock_irqrestore(&context_info->lock, flags);
458 if (context_info->is_done_rcv) {
459 context_info->is_done_rcv = false;
460 context_info->is_new_req = false;
463 if (!cmd->error || !cmd->retries ||
464 mmc_card_removed(host->card)) {
465 err = host->areq->err_check(host->card,
467 break; /* return err */
469 mmc_retune_recheck(host);
470 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
472 cmd->opcode, cmd->error);
475 __mmc_start_request(host, mrq);
476 continue; /* wait for done/new event again */
478 } else if (context_info->is_new_req) {
479 context_info->is_new_req = false;
481 return MMC_BLK_NEW_REQUEST;
484 mmc_retune_release(host);
488 static void mmc_wait_for_req_done(struct mmc_host *host,
489 struct mmc_request *mrq)
491 struct mmc_command *cmd;
494 wait_for_completion(&mrq->completion);
499 * If host has timed out waiting for the sanitize
500 * to complete, card might be still in programming state
501 * so let's try to bring the card out of programming
504 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
505 if (!mmc_interrupt_hpi(host->card)) {
506 pr_warn("%s: %s: Interrupted sanitize\n",
507 mmc_hostname(host), __func__);
511 pr_err("%s: %s: Failed to interrupt sanitize\n",
512 mmc_hostname(host), __func__);
515 if (!cmd->error || !cmd->retries ||
516 mmc_card_removed(host->card))
519 mmc_retune_recheck(host);
521 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
522 mmc_hostname(host), cmd->opcode, cmd->error);
525 __mmc_start_request(host, mrq);
528 mmc_retune_release(host);
532 * mmc_pre_req - Prepare for a new request
533 * @host: MMC host to prepare command
534 * @mrq: MMC request to prepare for
535 * @is_first_req: true if there is no previous started request
536 * that may run in parellel to this call, otherwise false
538 * mmc_pre_req() is called in prior to mmc_start_req() to let
539 * host prepare for the new request. Preparation of a request may be
540 * performed while another request is running on the host.
542 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
545 if (host->ops->pre_req)
546 host->ops->pre_req(host, mrq, is_first_req);
550 * mmc_post_req - Post process a completed request
551 * @host: MMC host to post process command
552 * @mrq: MMC request to post process for
553 * @err: Error, if non zero, clean up any resources made in pre_req
555 * Let the host post process a completed request. Post processing of
556 * a request may be performed while another reuqest is running.
558 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
561 if (host->ops->post_req)
562 host->ops->post_req(host, mrq, err);
566 * mmc_start_req - start a non-blocking request
567 * @host: MMC host to start command
568 * @areq: async request to start
569 * @error: out parameter returns 0 for success, otherwise non zero
571 * Start a new MMC custom command request for a host.
572 * If there is on ongoing async request wait for completion
573 * of that request and start the new one and return.
574 * Does not wait for the new request to complete.
576 * Returns the completed request, NULL in case of none completed.
577 * Wait for the an ongoing request (previoulsy started) to complete and
578 * return the completed request. If there is no ongoing request, NULL
579 * is returned without waiting. NULL is not an error condition.
581 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
582 struct mmc_async_req *areq, int *error)
586 struct mmc_async_req *data = host->areq;
588 /* Prepare a new request */
590 mmc_pre_req(host, areq->mrq, !host->areq);
593 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
594 if (err == MMC_BLK_NEW_REQUEST) {
598 * The previous request was not completed,
604 * Check BKOPS urgency for each R1 response
606 if (host->card && mmc_card_mmc(host->card) &&
607 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
608 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
609 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
611 /* Cancel the prepared request */
613 mmc_post_req(host, areq->mrq, -EINVAL);
615 mmc_start_bkops(host->card, true);
617 /* prepare the request again */
619 mmc_pre_req(host, areq->mrq, !host->areq);
624 trace_mmc_blk_rw_start(areq->mrq->cmd->opcode,
627 start_err = __mmc_start_data_req(host, areq->mrq);
631 mmc_post_req(host, host->areq->mrq, 0);
633 /* Cancel a prepared request if it was not started. */
634 if ((err || start_err) && areq)
635 mmc_post_req(host, areq->mrq, -EINVAL);
646 EXPORT_SYMBOL(mmc_start_req);
649 * mmc_wait_for_req - start a request and wait for completion
650 * @host: MMC host to start command
651 * @mrq: MMC request to start
653 * Start a new MMC custom command request for a host, and wait
654 * for the command to complete. Does not attempt to parse the
657 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
659 __mmc_start_req(host, mrq);
660 mmc_wait_for_req_done(host, mrq);
662 EXPORT_SYMBOL(mmc_wait_for_req);
665 * mmc_interrupt_hpi - Issue for High priority Interrupt
666 * @card: the MMC card associated with the HPI transfer
668 * Issued High Priority Interrupt, and check for card status
669 * until out-of prg-state.
671 int mmc_interrupt_hpi(struct mmc_card *card)
675 unsigned long prg_wait;
679 if (!card->ext_csd.hpi_en) {
680 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
684 mmc_claim_host(card->host);
685 err = mmc_send_status(card, &status);
687 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
691 switch (R1_CURRENT_STATE(status)) {
697 * In idle and transfer states, HPI is not needed and the caller
698 * can issue the next intended command immediately
704 /* In all other states, it's illegal to issue HPI */
705 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
706 mmc_hostname(card->host), R1_CURRENT_STATE(status));
711 err = mmc_send_hpi_cmd(card, &status);
715 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
717 err = mmc_send_status(card, &status);
719 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
721 if (time_after(jiffies, prg_wait))
726 mmc_release_host(card->host);
729 EXPORT_SYMBOL(mmc_interrupt_hpi);
732 * mmc_wait_for_cmd - start a command and wait for completion
733 * @host: MMC host to start command
734 * @cmd: MMC command to start
735 * @retries: maximum number of retries
737 * Start a new MMC command for a host, and wait for the command
738 * to complete. Return any error that occurred while the command
739 * was executing. Do not attempt to parse the response.
741 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
743 struct mmc_request mrq = {NULL};
745 WARN_ON(!host->claimed);
747 memset(cmd->resp, 0, sizeof(cmd->resp));
748 cmd->retries = retries;
753 mmc_wait_for_req(host, &mrq);
758 EXPORT_SYMBOL(mmc_wait_for_cmd);
761 * mmc_stop_bkops - stop ongoing BKOPS
762 * @card: MMC card to check BKOPS
764 * Send HPI command to stop ongoing background operations to
765 * allow rapid servicing of foreground operations, e.g. read/
766 * writes. Wait until the card comes out of the programming state
767 * to avoid errors in servicing read/write requests.
769 int mmc_stop_bkops(struct mmc_card *card)
774 err = mmc_interrupt_hpi(card);
777 * If err is EINVAL, we can't issue an HPI.
778 * It should complete the BKOPS.
780 if (!err || (err == -EINVAL)) {
781 mmc_card_clr_doing_bkops(card);
782 mmc_retune_release(card->host);
788 EXPORT_SYMBOL(mmc_stop_bkops);
790 int mmc_read_bkops_status(struct mmc_card *card)
795 mmc_claim_host(card->host);
796 err = mmc_get_ext_csd(card, &ext_csd);
797 mmc_release_host(card->host);
801 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
802 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
806 EXPORT_SYMBOL(mmc_read_bkops_status);
809 * mmc_set_data_timeout - set the timeout for a data command
810 * @data: data phase for command
811 * @card: the MMC card associated with the data transfer
813 * Computes the data timeout parameters according to the
814 * correct algorithm given the card type.
816 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
821 * SDIO cards only define an upper 1 s limit on access.
823 if (mmc_card_sdio(card)) {
824 data->timeout_ns = 1000000000;
825 data->timeout_clks = 0;
830 * SD cards use a 100 multiplier rather than 10
832 mult = mmc_card_sd(card) ? 100 : 10;
835 * Scale up the multiplier (and therefore the timeout) by
836 * the r2w factor for writes.
838 if (data->flags & MMC_DATA_WRITE)
839 mult <<= card->csd.r2w_factor;
841 data->timeout_ns = card->csd.tacc_ns * mult;
842 data->timeout_clks = card->csd.tacc_clks * mult;
845 * SD cards also have an upper limit on the timeout.
847 if (mmc_card_sd(card)) {
848 unsigned int timeout_us, limit_us;
850 timeout_us = data->timeout_ns / 1000;
851 if (card->host->ios.clock)
852 timeout_us += data->timeout_clks * 1000 /
853 (card->host->ios.clock / 1000);
855 if (data->flags & MMC_DATA_WRITE)
857 * The MMC spec "It is strongly recommended
858 * for hosts to implement more than 500ms
859 * timeout value even if the card indicates
860 * the 250ms maximum busy length." Even the
861 * previous value of 300ms is known to be
862 * insufficient for some cards.
869 * SDHC cards always use these fixed values.
871 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
872 data->timeout_ns = limit_us * 1000;
873 data->timeout_clks = 0;
876 /* assign limit value if invalid */
878 data->timeout_ns = limit_us * 1000;
882 * Some cards require longer data read timeout than indicated in CSD.
883 * Address this by setting the read timeout to a "reasonably high"
884 * value. For the cards tested, 300ms has proven enough. If necessary,
885 * this value can be increased if other problematic cards require this.
887 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
888 data->timeout_ns = 300000000;
889 data->timeout_clks = 0;
893 * Some cards need very high timeouts if driven in SPI mode.
894 * The worst observed timeout was 900ms after writing a
895 * continuous stream of data until the internal logic
898 if (mmc_host_is_spi(card->host)) {
899 if (data->flags & MMC_DATA_WRITE) {
900 if (data->timeout_ns < 1000000000)
901 data->timeout_ns = 1000000000; /* 1s */
903 if (data->timeout_ns < 100000000)
904 data->timeout_ns = 100000000; /* 100ms */
908 EXPORT_SYMBOL(mmc_set_data_timeout);
911 * mmc_align_data_size - pads a transfer size to a more optimal value
912 * @card: the MMC card associated with the data transfer
913 * @sz: original transfer size
915 * Pads the original data size with a number of extra bytes in
916 * order to avoid controller bugs and/or performance hits
917 * (e.g. some controllers revert to PIO for certain sizes).
919 * Returns the improved size, which might be unmodified.
921 * Note that this function is only relevant when issuing a
922 * single scatter gather entry.
924 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
927 * FIXME: We don't have a system for the controller to tell
928 * the core about its problems yet, so for now we just 32-bit
931 sz = ((sz + 3) / 4) * 4;
935 EXPORT_SYMBOL(mmc_align_data_size);
938 * __mmc_claim_host - exclusively claim a host
939 * @host: mmc host to claim
940 * @abort: whether or not the operation should be aborted
942 * Claim a host for a set of operations. If @abort is non null and
943 * dereference a non-zero value then this will return prematurely with
944 * that non-zero value without acquiring the lock. Returns zero
945 * with the lock held otherwise.
947 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
949 DECLARE_WAITQUEUE(wait, current);
956 add_wait_queue(&host->wq, &wait);
957 spin_lock_irqsave(&host->lock, flags);
959 set_current_state(TASK_UNINTERRUPTIBLE);
960 stop = abort ? atomic_read(abort) : 0;
961 if (stop || !host->claimed || host->claimer == current)
963 spin_unlock_irqrestore(&host->lock, flags);
965 spin_lock_irqsave(&host->lock, flags);
967 set_current_state(TASK_RUNNING);
970 host->claimer = current;
971 host->claim_cnt += 1;
972 if (host->claim_cnt == 1)
976 spin_unlock_irqrestore(&host->lock, flags);
977 remove_wait_queue(&host->wq, &wait);
980 pm_runtime_get_sync(mmc_dev(host));
984 EXPORT_SYMBOL(__mmc_claim_host);
987 * mmc_release_host - release a host
988 * @host: mmc host to release
990 * Release a MMC host, allowing others to claim the host
991 * for their operations.
993 void mmc_release_host(struct mmc_host *host)
997 WARN_ON(!host->claimed);
999 spin_lock_irqsave(&host->lock, flags);
1000 if (--host->claim_cnt) {
1001 /* Release for nested claim */
1002 spin_unlock_irqrestore(&host->lock, flags);
1005 host->claimer = NULL;
1006 spin_unlock_irqrestore(&host->lock, flags);
1008 pm_runtime_mark_last_busy(mmc_dev(host));
1009 pm_runtime_put_autosuspend(mmc_dev(host));
1012 EXPORT_SYMBOL(mmc_release_host);
1015 * This is a helper function, which fetches a runtime pm reference for the
1016 * card device and also claims the host.
1018 void mmc_get_card(struct mmc_card *card)
1020 pm_runtime_get_sync(&card->dev);
1021 mmc_claim_host(card->host);
1023 EXPORT_SYMBOL(mmc_get_card);
1026 * This is a helper function, which releases the host and drops the runtime
1027 * pm reference for the card device.
1029 void mmc_put_card(struct mmc_card *card)
1031 mmc_release_host(card->host);
1032 pm_runtime_mark_last_busy(&card->dev);
1033 pm_runtime_put_autosuspend(&card->dev);
1035 EXPORT_SYMBOL(mmc_put_card);
1038 * Internal function that does the actual ios call to the host driver,
1039 * optionally printing some debug output.
1041 static inline void mmc_set_ios(struct mmc_host *host)
1043 struct mmc_ios *ios = &host->ios;
1045 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1046 "width %u timing %u\n",
1047 mmc_hostname(host), ios->clock, ios->bus_mode,
1048 ios->power_mode, ios->chip_select, ios->vdd,
1049 ios->bus_width, ios->timing);
1051 host->ops->set_ios(host, ios);
1055 * Control chip select pin on a host.
1057 void mmc_set_chip_select(struct mmc_host *host, int mode)
1059 host->ios.chip_select = mode;
1064 * Sets the host clock to the highest possible frequency that
1067 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1069 WARN_ON(hz && hz < host->f_min);
1071 if (hz > host->f_max)
1074 host->ios.clock = hz;
1078 int mmc_execute_tuning(struct mmc_card *card)
1080 struct mmc_host *host = card->host;
1084 if (!host->ops->execute_tuning)
1087 if (mmc_card_mmc(card))
1088 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1090 opcode = MMC_SEND_TUNING_BLOCK;
1092 err = host->ops->execute_tuning(host, opcode);
1095 pr_err("%s: tuning execution failed\n", mmc_hostname(host));
1097 mmc_retune_enable(host);
1103 * Change the bus mode (open drain/push-pull) of a host.
1105 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1107 host->ios.bus_mode = mode;
1112 * Change data bus width of a host.
1114 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1116 host->ios.bus_width = width;
1121 * Set initial state after a power cycle or a hw_reset.
1123 void mmc_set_initial_state(struct mmc_host *host)
1125 mmc_retune_disable(host);
1127 if (mmc_host_is_spi(host))
1128 host->ios.chip_select = MMC_CS_HIGH;
1130 host->ios.chip_select = MMC_CS_DONTCARE;
1131 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1132 host->ios.bus_width = MMC_BUS_WIDTH_1;
1133 host->ios.timing = MMC_TIMING_LEGACY;
1134 host->ios.drv_type = 0;
1140 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1141 * @vdd: voltage (mV)
1142 * @low_bits: prefer low bits in boundary cases
1144 * This function returns the OCR bit number according to the provided @vdd
1145 * value. If conversion is not possible a negative errno value returned.
1147 * Depending on the @low_bits flag the function prefers low or high OCR bits
1148 * on boundary voltages. For example,
1149 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1150 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1152 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1154 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1156 const int max_bit = ilog2(MMC_VDD_35_36);
1159 if (vdd < 1650 || vdd > 3600)
1162 if (vdd >= 1650 && vdd <= 1950)
1163 return ilog2(MMC_VDD_165_195);
1168 /* Base 2000 mV, step 100 mV, bit's base 8. */
1169 bit = (vdd - 2000) / 100 + 8;
1176 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1177 * @vdd_min: minimum voltage value (mV)
1178 * @vdd_max: maximum voltage value (mV)
1180 * This function returns the OCR mask bits according to the provided @vdd_min
1181 * and @vdd_max values. If conversion is not possible the function returns 0.
1183 * Notes wrt boundary cases:
1184 * This function sets the OCR bits for all boundary voltages, for example
1185 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1186 * MMC_VDD_34_35 mask.
1188 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1192 if (vdd_max < vdd_min)
1195 /* Prefer high bits for the boundary vdd_max values. */
1196 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1200 /* Prefer low bits for the boundary vdd_min values. */
1201 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1205 /* Fill the mask, from max bit to min bit. */
1206 while (vdd_max >= vdd_min)
1207 mask |= 1 << vdd_max--;
1211 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1216 * mmc_of_parse_voltage - return mask of supported voltages
1217 * @np: The device node need to be parsed.
1218 * @mask: mask of voltages available for MMC/SD/SDIO
1220 * 1. Return zero on success.
1221 * 2. Return negative errno: voltage-range is invalid.
1223 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1225 const u32 *voltage_ranges;
1228 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1229 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1230 if (!voltage_ranges || !num_ranges) {
1231 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1235 for (i = 0; i < num_ranges; i++) {
1236 const int j = i * 2;
1239 ocr_mask = mmc_vddrange_to_ocrmask(
1240 be32_to_cpu(voltage_ranges[j]),
1241 be32_to_cpu(voltage_ranges[j + 1]));
1243 pr_err("%s: voltage-range #%d is invalid\n",
1252 EXPORT_SYMBOL(mmc_of_parse_voltage);
1254 #endif /* CONFIG_OF */
1256 static int mmc_of_get_func_num(struct device_node *node)
1261 ret = of_property_read_u32(node, "reg", ®);
1268 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1271 struct device_node *node;
1273 if (!host->parent || !host->parent->of_node)
1276 for_each_child_of_node(host->parent->of_node, node) {
1277 if (mmc_of_get_func_num(node) == func_num)
1284 #ifdef CONFIG_REGULATOR
1287 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1288 * @vdd_bit: OCR bit number
1289 * @min_uV: minimum voltage value (mV)
1290 * @max_uV: maximum voltage value (mV)
1292 * This function returns the voltage range according to the provided OCR
1293 * bit number. If conversion is not possible a negative errno value returned.
1295 static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1303 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1304 * bits this regulator doesn't quite support ... don't
1305 * be too picky, most cards and regulators are OK with
1306 * a 0.1V range goof (it's a small error percentage).
1308 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1310 *min_uV = 1650 * 1000;
1311 *max_uV = 1950 * 1000;
1313 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1314 *max_uV = *min_uV + 100 * 1000;
1321 * mmc_regulator_get_ocrmask - return mask of supported voltages
1322 * @supply: regulator to use
1324 * This returns either a negative errno, or a mask of voltages that
1325 * can be provided to MMC/SD/SDIO devices using the specified voltage
1326 * regulator. This would normally be called before registering the
1329 int mmc_regulator_get_ocrmask(struct regulator *supply)
1337 count = regulator_count_voltages(supply);
1341 for (i = 0; i < count; i++) {
1342 vdd_uV = regulator_list_voltage(supply, i);
1346 vdd_mV = vdd_uV / 1000;
1347 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1351 vdd_uV = regulator_get_voltage(supply);
1355 vdd_mV = vdd_uV / 1000;
1356 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1361 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1364 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1365 * @mmc: the host to regulate
1366 * @supply: regulator to use
1367 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1369 * Returns zero on success, else negative errno.
1371 * MMC host drivers may use this to enable or disable a regulator using
1372 * a particular supply voltage. This would normally be called from the
1375 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1376 struct regulator *supply,
1377 unsigned short vdd_bit)
1383 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1385 result = regulator_set_voltage(supply, min_uV, max_uV);
1386 if (result == 0 && !mmc->regulator_enabled) {
1387 result = regulator_enable(supply);
1389 mmc->regulator_enabled = true;
1391 } else if (mmc->regulator_enabled) {
1392 result = regulator_disable(supply);
1394 mmc->regulator_enabled = false;
1398 dev_err(mmc_dev(mmc),
1399 "could not set regulator OCR (%d)\n", result);
1402 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1404 static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1405 int min_uV, int target_uV,
1409 * Check if supported first to avoid errors since we may try several
1410 * signal levels during power up and don't want to show errors.
1412 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1415 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1420 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1422 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1423 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1424 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1425 * SD card spec also define VQMMC in terms of VMMC.
1426 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1428 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1429 * requested voltage. This is definitely a good idea for UHS where there's a
1430 * separate regulator on the card that's trying to make 1.8V and it's best if
1433 * This function is expected to be used by a controller's
1434 * start_signal_voltage_switch() function.
1436 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1438 struct device *dev = mmc_dev(mmc);
1439 int ret, volt, min_uV, max_uV;
1441 /* If no vqmmc supply then we can't change the voltage */
1442 if (IS_ERR(mmc->supply.vqmmc))
1445 switch (ios->signal_voltage) {
1446 case MMC_SIGNAL_VOLTAGE_120:
1447 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1448 1100000, 1200000, 1300000);
1449 case MMC_SIGNAL_VOLTAGE_180:
1450 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1451 1700000, 1800000, 1950000);
1452 case MMC_SIGNAL_VOLTAGE_330:
1453 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1457 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1458 __func__, volt, max_uV);
1460 min_uV = max(volt - 300000, 2700000);
1461 max_uV = min(max_uV + 200000, 3600000);
1464 * Due to a limitation in the current implementation of
1465 * regulator_set_voltage_triplet() which is taking the lowest
1466 * voltage possible if below the target, search for a suitable
1467 * voltage in two steps and try to stay close to vmmc
1468 * with a 0.3V tolerance at first.
1470 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1471 min_uV, volt, max_uV))
1474 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1475 2700000, volt, 3600000);
1480 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1482 #endif /* CONFIG_REGULATOR */
1484 int mmc_regulator_get_supply(struct mmc_host *mmc)
1486 struct device *dev = mmc_dev(mmc);
1489 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1490 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1492 if (IS_ERR(mmc->supply.vmmc)) {
1493 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1494 return -EPROBE_DEFER;
1495 dev_info(dev, "No vmmc regulator found\n");
1497 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1499 mmc->ocr_avail = ret;
1501 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1504 if (IS_ERR(mmc->supply.vqmmc)) {
1505 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1506 return -EPROBE_DEFER;
1507 dev_info(dev, "No vqmmc regulator found\n");
1512 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1515 * Mask off any voltages we don't support and select
1516 * the lowest voltage
1518 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1523 * Sanity check the voltages that the card claims to
1527 dev_warn(mmc_dev(host),
1528 "card claims to support voltages below defined range\n");
1532 ocr &= host->ocr_avail;
1534 dev_warn(mmc_dev(host), "no support for card's volts\n");
1538 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1541 mmc_power_cycle(host, ocr);
1545 if (bit != host->ios.vdd)
1546 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1552 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1555 int old_signal_voltage = host->ios.signal_voltage;
1557 host->ios.signal_voltage = signal_voltage;
1558 if (host->ops->start_signal_voltage_switch)
1559 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1562 host->ios.signal_voltage = old_signal_voltage;
1568 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1570 struct mmc_command cmd = {0};
1577 * Send CMD11 only if the request is to switch the card to
1580 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1581 return __mmc_set_signal_voltage(host, signal_voltage);
1584 * If we cannot switch voltages, return failure so the caller
1585 * can continue without UHS mode
1587 if (!host->ops->start_signal_voltage_switch)
1589 if (!host->ops->card_busy)
1590 pr_warn("%s: cannot verify signal voltage switch\n",
1591 mmc_hostname(host));
1593 cmd.opcode = SD_SWITCH_VOLTAGE;
1595 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1597 err = mmc_wait_for_cmd(host, &cmd, 0);
1601 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1605 * The card should drive cmd and dat[0:3] low immediately
1606 * after the response of cmd11, but wait 1 ms to be sure
1609 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1614 * During a signal voltage level switch, the clock must be gated
1615 * for 5 ms according to the SD spec
1617 clock = host->ios.clock;
1618 host->ios.clock = 0;
1621 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1623 * Voltages may not have been switched, but we've already
1624 * sent CMD11, so a power cycle is required anyway
1630 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1632 host->ios.clock = clock;
1635 /* Wait for at least 1 ms according to spec */
1639 * Failure to switch is indicated by the card holding
1642 if (host->ops->card_busy && host->ops->card_busy(host))
1647 pr_debug("%s: Signal voltage switch failed, "
1648 "power cycling card\n", mmc_hostname(host));
1649 mmc_power_cycle(host, ocr);
1656 * Select timing parameters for host.
1658 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1660 host->ios.timing = timing;
1665 * Select appropriate driver type for host.
1667 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1669 host->ios.drv_type = drv_type;
1673 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1674 int card_drv_type, int *drv_type)
1676 struct mmc_host *host = card->host;
1677 int host_drv_type = SD_DRIVER_TYPE_B;
1681 if (!host->ops->select_drive_strength)
1684 /* Use SD definition of driver strength for hosts */
1685 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1686 host_drv_type |= SD_DRIVER_TYPE_A;
1688 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1689 host_drv_type |= SD_DRIVER_TYPE_C;
1691 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1692 host_drv_type |= SD_DRIVER_TYPE_D;
1695 * The drive strength that the hardware can support
1696 * depends on the board design. Pass the appropriate
1697 * information and let the hardware specific code
1698 * return what is possible given the options
1700 return host->ops->select_drive_strength(card, max_dtr,
1707 * Apply power to the MMC stack. This is a two-stage process.
1708 * First, we enable power to the card without the clock running.
1709 * We then wait a bit for the power to stabilise. Finally,
1710 * enable the bus drivers and clock to the card.
1712 * We must _NOT_ enable the clock prior to power stablising.
1714 * If a host does all the power sequencing itself, ignore the
1715 * initial MMC_POWER_UP stage.
1717 void mmc_power_up(struct mmc_host *host, u32 ocr)
1719 if (host->ios.power_mode == MMC_POWER_ON)
1722 mmc_pwrseq_pre_power_on(host);
1724 host->ios.vdd = fls(ocr) - 1;
1725 host->ios.power_mode = MMC_POWER_UP;
1726 /* Set initial state and call mmc_set_ios */
1727 mmc_set_initial_state(host);
1729 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1730 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1731 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1732 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1733 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1734 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1735 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1738 * This delay should be sufficient to allow the power supply
1739 * to reach the minimum voltage.
1743 mmc_pwrseq_post_power_on(host);
1745 host->ios.clock = host->f_init;
1747 host->ios.power_mode = MMC_POWER_ON;
1751 * This delay must be at least 74 clock sizes, or 1 ms, or the
1752 * time required to reach a stable voltage.
1757 void mmc_power_off(struct mmc_host *host)
1759 if (host->ios.power_mode == MMC_POWER_OFF)
1762 mmc_pwrseq_power_off(host);
1764 host->ios.clock = 0;
1767 host->ios.power_mode = MMC_POWER_OFF;
1768 /* Set initial state and call mmc_set_ios */
1769 mmc_set_initial_state(host);
1772 * Some configurations, such as the 802.11 SDIO card in the OLPC
1773 * XO-1.5, require a short delay after poweroff before the card
1774 * can be successfully turned on again.
1779 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1781 mmc_power_off(host);
1782 /* Wait at least 1 ms according to SD spec */
1784 mmc_power_up(host, ocr);
1788 * Cleanup when the last reference to the bus operator is dropped.
1790 static void __mmc_release_bus(struct mmc_host *host)
1793 BUG_ON(host->bus_refs);
1794 BUG_ON(!host->bus_dead);
1796 host->bus_ops = NULL;
1800 * Increase reference count of bus operator
1802 static inline void mmc_bus_get(struct mmc_host *host)
1804 unsigned long flags;
1806 spin_lock_irqsave(&host->lock, flags);
1808 spin_unlock_irqrestore(&host->lock, flags);
1812 * Decrease reference count of bus operator and free it if
1813 * it is the last reference.
1815 static inline void mmc_bus_put(struct mmc_host *host)
1817 unsigned long flags;
1819 spin_lock_irqsave(&host->lock, flags);
1821 if ((host->bus_refs == 0) && host->bus_ops)
1822 __mmc_release_bus(host);
1823 spin_unlock_irqrestore(&host->lock, flags);
1827 * Assign a mmc bus handler to a host. Only one bus handler may control a
1828 * host at any given time.
1830 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1832 unsigned long flags;
1837 WARN_ON(!host->claimed);
1839 spin_lock_irqsave(&host->lock, flags);
1841 BUG_ON(host->bus_ops);
1842 BUG_ON(host->bus_refs);
1844 host->bus_ops = ops;
1848 spin_unlock_irqrestore(&host->lock, flags);
1852 * Remove the current bus handler from a host.
1854 void mmc_detach_bus(struct mmc_host *host)
1856 unsigned long flags;
1860 WARN_ON(!host->claimed);
1861 WARN_ON(!host->bus_ops);
1863 spin_lock_irqsave(&host->lock, flags);
1867 spin_unlock_irqrestore(&host->lock, flags);
1872 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1875 #ifdef CONFIG_MMC_DEBUG
1876 unsigned long flags;
1877 spin_lock_irqsave(&host->lock, flags);
1878 WARN_ON(host->removed);
1879 spin_unlock_irqrestore(&host->lock, flags);
1883 * If the device is configured as wakeup, we prevent a new sleep for
1884 * 5 s to give provision for user space to consume the event.
1886 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1887 device_can_wakeup(mmc_dev(host)))
1888 pm_wakeup_event(mmc_dev(host), 5000);
1890 host->detect_change = 1;
1891 mmc_schedule_delayed_work(&host->detect, delay);
1895 * mmc_detect_change - process change of state on a MMC socket
1896 * @host: host which changed state.
1897 * @delay: optional delay to wait before detection (jiffies)
1899 * MMC drivers should call this when they detect a card has been
1900 * inserted or removed. The MMC layer will confirm that any
1901 * present card is still functional, and initialize any newly
1904 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1906 _mmc_detect_change(host, delay, true);
1908 EXPORT_SYMBOL(mmc_detect_change);
1910 void mmc_init_erase(struct mmc_card *card)
1914 if (is_power_of_2(card->erase_size))
1915 card->erase_shift = ffs(card->erase_size) - 1;
1917 card->erase_shift = 0;
1920 * It is possible to erase an arbitrarily large area of an SD or MMC
1921 * card. That is not desirable because it can take a long time
1922 * (minutes) potentially delaying more important I/O, and also the
1923 * timeout calculations become increasingly hugely over-estimated.
1924 * Consequently, 'pref_erase' is defined as a guide to limit erases
1925 * to that size and alignment.
1927 * For SD cards that define Allocation Unit size, limit erases to one
1928 * Allocation Unit at a time. For MMC cards that define High Capacity
1929 * Erase Size, whether it is switched on or not, limit to that size.
1930 * Otherwise just have a stab at a good value. For modern cards it
1931 * will end up being 4MiB. Note that if the value is too small, it
1932 * can end up taking longer to erase.
1934 if (mmc_card_sd(card) && card->ssr.au) {
1935 card->pref_erase = card->ssr.au;
1936 card->erase_shift = ffs(card->ssr.au) - 1;
1937 } else if (card->ext_csd.hc_erase_size) {
1938 card->pref_erase = card->ext_csd.hc_erase_size;
1939 } else if (card->erase_size) {
1940 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1942 card->pref_erase = 512 * 1024 / 512;
1944 card->pref_erase = 1024 * 1024 / 512;
1946 card->pref_erase = 2 * 1024 * 1024 / 512;
1948 card->pref_erase = 4 * 1024 * 1024 / 512;
1949 if (card->pref_erase < card->erase_size)
1950 card->pref_erase = card->erase_size;
1952 sz = card->pref_erase % card->erase_size;
1954 card->pref_erase += card->erase_size - sz;
1957 card->pref_erase = 0;
1960 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1961 unsigned int arg, unsigned int qty)
1963 unsigned int erase_timeout;
1965 if (arg == MMC_DISCARD_ARG ||
1966 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1967 erase_timeout = card->ext_csd.trim_timeout;
1968 } else if (card->ext_csd.erase_group_def & 1) {
1969 /* High Capacity Erase Group Size uses HC timeouts */
1970 if (arg == MMC_TRIM_ARG)
1971 erase_timeout = card->ext_csd.trim_timeout;
1973 erase_timeout = card->ext_csd.hc_erase_timeout;
1975 /* CSD Erase Group Size uses write timeout */
1976 unsigned int mult = (10 << card->csd.r2w_factor);
1977 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1978 unsigned int timeout_us;
1980 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1981 if (card->csd.tacc_ns < 1000000)
1982 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1984 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1987 * ios.clock is only a target. The real clock rate might be
1988 * less but not that much less, so fudge it by multiplying by 2.
1991 timeout_us += (timeout_clks * 1000) /
1992 (card->host->ios.clock / 1000);
1994 erase_timeout = timeout_us / 1000;
1997 * Theoretically, the calculation could underflow so round up
1998 * to 1ms in that case.
2004 /* Multiplier for secure operations */
2005 if (arg & MMC_SECURE_ARGS) {
2006 if (arg == MMC_SECURE_ERASE_ARG)
2007 erase_timeout *= card->ext_csd.sec_erase_mult;
2009 erase_timeout *= card->ext_csd.sec_trim_mult;
2012 erase_timeout *= qty;
2015 * Ensure at least a 1 second timeout for SPI as per
2016 * 'mmc_set_data_timeout()'
2018 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2019 erase_timeout = 1000;
2021 return erase_timeout;
2024 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2028 unsigned int erase_timeout;
2030 if (card->ssr.erase_timeout) {
2031 /* Erase timeout specified in SD Status Register (SSR) */
2032 erase_timeout = card->ssr.erase_timeout * qty +
2033 card->ssr.erase_offset;
2036 * Erase timeout not specified in SD Status Register (SSR) so
2037 * use 250ms per write block.
2039 erase_timeout = 250 * qty;
2042 /* Must not be less than 1 second */
2043 if (erase_timeout < 1000)
2044 erase_timeout = 1000;
2046 return erase_timeout;
2049 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2053 if (mmc_card_sd(card))
2054 return mmc_sd_erase_timeout(card, arg, qty);
2056 return mmc_mmc_erase_timeout(card, arg, qty);
2059 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2060 unsigned int to, unsigned int arg)
2062 struct mmc_command cmd = {0};
2063 unsigned int qty = 0;
2064 unsigned long timeout;
2065 unsigned int fr, nr;
2070 trace_mmc_blk_erase_start(arg, fr, nr);
2072 mmc_retune_hold(card->host);
2075 * qty is used to calculate the erase timeout which depends on how many
2076 * erase groups (or allocation units in SD terminology) are affected.
2077 * We count erasing part of an erase group as one erase group.
2078 * For SD, the allocation units are always a power of 2. For MMC, the
2079 * erase group size is almost certainly also power of 2, but it does not
2080 * seem to insist on that in the JEDEC standard, so we fall back to
2081 * division in that case. SD may not specify an allocation unit size,
2082 * in which case the timeout is based on the number of write blocks.
2084 * Note that the timeout for secure trim 2 will only be correct if the
2085 * number of erase groups specified is the same as the total of all
2086 * preceding secure trim 1 commands. Since the power may have been
2087 * lost since the secure trim 1 commands occurred, it is generally
2088 * impossible to calculate the secure trim 2 timeout correctly.
2090 if (card->erase_shift)
2091 qty += ((to >> card->erase_shift) -
2092 (from >> card->erase_shift)) + 1;
2093 else if (mmc_card_sd(card))
2094 qty += to - from + 1;
2096 qty += ((to / card->erase_size) -
2097 (from / card->erase_size)) + 1;
2099 if (!mmc_card_blockaddr(card)) {
2104 if (mmc_card_sd(card))
2105 cmd.opcode = SD_ERASE_WR_BLK_START;
2107 cmd.opcode = MMC_ERASE_GROUP_START;
2109 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2110 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2112 pr_err("mmc_erase: group start error %d, "
2113 "status %#x\n", err, cmd.resp[0]);
2118 memset(&cmd, 0, sizeof(struct mmc_command));
2119 if (mmc_card_sd(card))
2120 cmd.opcode = SD_ERASE_WR_BLK_END;
2122 cmd.opcode = MMC_ERASE_GROUP_END;
2124 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2125 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2127 pr_err("mmc_erase: group end error %d, status %#x\n",
2133 memset(&cmd, 0, sizeof(struct mmc_command));
2134 cmd.opcode = MMC_ERASE;
2136 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2137 cmd.busy_timeout = mmc_erase_timeout(card, arg, qty);
2138 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2140 pr_err("mmc_erase: erase error %d, status %#x\n",
2146 if (mmc_host_is_spi(card->host))
2149 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2151 memset(&cmd, 0, sizeof(struct mmc_command));
2152 cmd.opcode = MMC_SEND_STATUS;
2153 cmd.arg = card->rca << 16;
2154 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2155 /* Do not retry else we can't see errors */
2156 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2157 if (err || (cmd.resp[0] & 0xFDF92000)) {
2158 pr_err("error %d requesting status %#x\n",
2164 /* Timeout if the device never becomes ready for data and
2165 * never leaves the program state.
2167 if (time_after(jiffies, timeout)) {
2168 pr_err("%s: Card stuck in programming state! %s\n",
2169 mmc_hostname(card->host), __func__);
2174 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2175 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2177 mmc_retune_release(card->host);
2178 trace_mmc_blk_erase_end(arg, fr, nr);
2183 * mmc_erase - erase sectors.
2184 * @card: card to erase
2185 * @from: first sector to erase
2186 * @nr: number of sectors to erase
2187 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2189 * Caller must claim host before calling this function.
2191 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2194 unsigned int rem, to = from + nr;
2197 if (!(card->host->caps & MMC_CAP_ERASE) ||
2198 !(card->csd.cmdclass & CCC_ERASE))
2201 if (!card->erase_size)
2204 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2207 if ((arg & MMC_SECURE_ARGS) &&
2208 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2211 if ((arg & MMC_TRIM_ARGS) &&
2212 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2215 if (arg == MMC_SECURE_ERASE_ARG) {
2216 if (from % card->erase_size || nr % card->erase_size)
2220 if (arg == MMC_ERASE_ARG) {
2221 rem = from % card->erase_size;
2223 rem = card->erase_size - rem;
2230 rem = nr % card->erase_size;
2243 /* 'from' and 'to' are inclusive */
2247 * Special case where only one erase-group fits in the timeout budget:
2248 * If the region crosses an erase-group boundary on this particular
2249 * case, we will be trimming more than one erase-group which, does not
2250 * fit in the timeout budget of the controller, so we need to split it
2251 * and call mmc_do_erase() twice if necessary. This special case is
2252 * identified by the card->eg_boundary flag.
2254 rem = card->erase_size - (from % card->erase_size);
2255 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2256 err = mmc_do_erase(card, from, from + rem - 1, arg);
2258 if ((err) || (to <= from))
2262 return mmc_do_erase(card, from, to, arg);
2264 EXPORT_SYMBOL(mmc_erase);
2266 int mmc_can_erase(struct mmc_card *card)
2268 if ((card->host->caps & MMC_CAP_ERASE) &&
2269 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2273 EXPORT_SYMBOL(mmc_can_erase);
2275 int mmc_can_trim(struct mmc_card *card)
2277 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2278 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2282 EXPORT_SYMBOL(mmc_can_trim);
2284 int mmc_can_discard(struct mmc_card *card)
2287 * As there's no way to detect the discard support bit at v4.5
2288 * use the s/w feature support filed.
2290 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2294 EXPORT_SYMBOL(mmc_can_discard);
2296 int mmc_can_sanitize(struct mmc_card *card)
2298 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2300 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2304 EXPORT_SYMBOL(mmc_can_sanitize);
2306 int mmc_can_secure_erase_trim(struct mmc_card *card)
2308 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2309 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2313 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2315 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2318 if (!card->erase_size)
2320 if (from % card->erase_size || nr % card->erase_size)
2324 EXPORT_SYMBOL(mmc_erase_group_aligned);
2326 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2329 struct mmc_host *host = card->host;
2330 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2331 unsigned int last_timeout = 0;
2333 if (card->erase_shift)
2334 max_qty = UINT_MAX >> card->erase_shift;
2335 else if (mmc_card_sd(card))
2338 max_qty = UINT_MAX / card->erase_size;
2340 /* Find the largest qty with an OK timeout */
2343 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2344 timeout = mmc_erase_timeout(card, arg, qty + x);
2345 if (timeout > host->max_busy_timeout)
2347 if (timeout < last_timeout)
2349 last_timeout = timeout;
2359 * When specifying a sector range to trim, chances are we might cross
2360 * an erase-group boundary even if the amount of sectors is less than
2362 * If we can only fit one erase-group in the controller timeout budget,
2363 * we have to care that erase-group boundaries are not crossed by a
2364 * single trim operation. We flag that special case with "eg_boundary".
2365 * In all other cases we can just decrement qty and pretend that we
2366 * always touch (qty + 1) erase-groups as a simple optimization.
2369 card->eg_boundary = 1;
2373 /* Convert qty to sectors */
2374 if (card->erase_shift)
2375 max_discard = qty << card->erase_shift;
2376 else if (mmc_card_sd(card))
2377 max_discard = qty + 1;
2379 max_discard = qty * card->erase_size;
2384 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2386 struct mmc_host *host = card->host;
2387 unsigned int max_discard, max_trim;
2389 if (!host->max_busy_timeout)
2393 * Without erase_group_def set, MMC erase timeout depends on clock
2394 * frequence which can change. In that case, the best choice is
2395 * just the preferred erase size.
2397 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2398 return card->pref_erase;
2400 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2401 if (mmc_can_trim(card)) {
2402 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2403 if (max_trim < max_discard)
2404 max_discard = max_trim;
2405 } else if (max_discard < card->erase_size) {
2408 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2409 mmc_hostname(host), max_discard, host->max_busy_timeout);
2412 EXPORT_SYMBOL(mmc_calc_max_discard);
2414 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2416 struct mmc_command cmd = {0};
2418 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card))
2421 cmd.opcode = MMC_SET_BLOCKLEN;
2423 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2424 return mmc_wait_for_cmd(card->host, &cmd, 5);
2426 EXPORT_SYMBOL(mmc_set_blocklen);
2428 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2431 struct mmc_command cmd = {0};
2433 cmd.opcode = MMC_SET_BLOCK_COUNT;
2434 cmd.arg = blockcount & 0x0000FFFF;
2437 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2438 return mmc_wait_for_cmd(card->host, &cmd, 5);
2440 EXPORT_SYMBOL(mmc_set_blockcount);
2442 static void mmc_hw_reset_for_init(struct mmc_host *host)
2444 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2446 host->ops->hw_reset(host);
2449 int mmc_hw_reset(struct mmc_host *host)
2457 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2462 ret = host->bus_ops->reset(host);
2465 if (ret != -EOPNOTSUPP)
2466 pr_warn("%s: tried to reset card\n", mmc_hostname(host));
2470 EXPORT_SYMBOL(mmc_hw_reset);
2472 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2474 host->f_init = freq;
2476 #ifdef CONFIG_MMC_DEBUG
2477 pr_info("%s: %s: trying to init card at %u Hz\n",
2478 mmc_hostname(host), __func__, host->f_init);
2480 mmc_power_up(host, host->ocr_avail);
2483 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2484 * do a hardware reset if possible.
2486 mmc_hw_reset_for_init(host);
2489 * sdio_reset sends CMD52 to reset card. Since we do not know
2490 * if the card is being re-initialized, just send it. CMD52
2491 * should be ignored by SD/eMMC cards.
2496 mmc_send_if_cond(host, host->ocr_avail);
2498 /* Order's important: probe SDIO, then SD, then MMC */
2499 if (!mmc_attach_sdio(host))
2501 if (!mmc_attach_sd(host))
2503 if (!mmc_attach_mmc(host))
2506 mmc_power_off(host);
2510 int _mmc_detect_card_removed(struct mmc_host *host)
2514 if (host->caps & MMC_CAP_NONREMOVABLE)
2517 if (!host->card || mmc_card_removed(host->card))
2520 ret = host->bus_ops->alive(host);
2523 * Card detect status and alive check may be out of sync if card is
2524 * removed slowly, when card detect switch changes while card/slot
2525 * pads are still contacted in hardware (refer to "SD Card Mechanical
2526 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2527 * detect work 200ms later for this case.
2529 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2530 mmc_detect_change(host, msecs_to_jiffies(200));
2531 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2535 mmc_card_set_removed(host->card);
2536 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2542 int mmc_detect_card_removed(struct mmc_host *host)
2544 struct mmc_card *card = host->card;
2547 WARN_ON(!host->claimed);
2552 ret = mmc_card_removed(card);
2554 * The card will be considered unchanged unless we have been asked to
2555 * detect a change or host requires polling to provide card detection.
2557 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2560 host->detect_change = 0;
2562 ret = _mmc_detect_card_removed(host);
2563 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2565 * Schedule a detect work as soon as possible to let a
2566 * rescan handle the card removal.
2568 cancel_delayed_work(&host->detect);
2569 _mmc_detect_change(host, 0, false);
2575 EXPORT_SYMBOL(mmc_detect_card_removed);
2577 void mmc_rescan(struct work_struct *work)
2579 struct mmc_host *host =
2580 container_of(work, struct mmc_host, detect.work);
2583 if (host->trigger_card_event && host->ops->card_event) {
2584 host->ops->card_event(host);
2585 host->trigger_card_event = false;
2588 if (host->rescan_disable)
2591 /* If there is a non-removable card registered, only scan once */
2592 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2594 host->rescan_entered = 1;
2599 * if there is a _removable_ card registered, check whether it is
2602 if (host->bus_ops && !host->bus_dead
2603 && !(host->caps & MMC_CAP_NONREMOVABLE))
2604 host->bus_ops->detect(host);
2606 host->detect_change = 0;
2608 /* If the card was removed the bus will be marked
2609 * as dead - extend the wakelock so userspace
2612 extend_wakelock = 1;
2615 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2616 * the card is no longer present.
2621 /* if there still is a card present, stop here */
2622 if (host->bus_ops != NULL) {
2628 * Only we can add a new handler, so it's safe to
2629 * release the lock here.
2633 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2634 host->ops->get_cd(host) == 0) {
2635 mmc_claim_host(host);
2636 mmc_power_off(host);
2637 mmc_release_host(host);
2641 mmc_claim_host(host);
2642 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2643 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2645 if (freqs[i] <= host->f_min)
2648 mmc_release_host(host);
2651 if (host->caps & MMC_CAP_NEEDS_POLL)
2652 mmc_schedule_delayed_work(&host->detect, HZ);
2655 void mmc_start_host(struct mmc_host *host)
2657 host->f_init = max(freqs[0], host->f_min);
2658 host->rescan_disable = 0;
2659 host->ios.power_mode = MMC_POWER_UNDEFINED;
2661 mmc_claim_host(host);
2662 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2663 mmc_power_off(host);
2665 mmc_power_up(host, host->ocr_avail);
2666 mmc_release_host(host);
2668 mmc_gpiod_request_cd_irq(host);
2669 _mmc_detect_change(host, 0, false);
2672 void mmc_stop_host(struct mmc_host *host)
2674 #ifdef CONFIG_MMC_DEBUG
2675 unsigned long flags;
2676 spin_lock_irqsave(&host->lock, flags);
2678 spin_unlock_irqrestore(&host->lock, flags);
2680 if (host->slot.cd_irq >= 0)
2681 disable_irq(host->slot.cd_irq);
2683 host->rescan_disable = 1;
2684 cancel_delayed_work_sync(&host->detect);
2685 mmc_flush_scheduled_work();
2687 /* clear pm flags now and let card drivers set them as needed */
2691 if (host->bus_ops && !host->bus_dead) {
2692 /* Calling bus_ops->remove() with a claimed host can deadlock */
2693 host->bus_ops->remove(host);
2694 mmc_claim_host(host);
2695 mmc_detach_bus(host);
2696 mmc_power_off(host);
2697 mmc_release_host(host);
2705 mmc_claim_host(host);
2706 mmc_power_off(host);
2707 mmc_release_host(host);
2710 int mmc_power_save_host(struct mmc_host *host)
2714 #ifdef CONFIG_MMC_DEBUG
2715 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2720 if (!host->bus_ops || host->bus_dead) {
2725 if (host->bus_ops->power_save)
2726 ret = host->bus_ops->power_save(host);
2730 mmc_power_off(host);
2734 EXPORT_SYMBOL(mmc_power_save_host);
2736 int mmc_power_restore_host(struct mmc_host *host)
2740 #ifdef CONFIG_MMC_DEBUG
2741 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2746 if (!host->bus_ops || host->bus_dead) {
2751 mmc_power_up(host, host->card->ocr);
2752 ret = host->bus_ops->power_restore(host);
2758 EXPORT_SYMBOL(mmc_power_restore_host);
2761 * Flush the cache to the non-volatile storage.
2763 int mmc_flush_cache(struct mmc_card *card)
2767 if (mmc_card_mmc(card) &&
2768 (card->ext_csd.cache_size > 0) &&
2769 (card->ext_csd.cache_ctrl & 1)) {
2770 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2771 EXT_CSD_FLUSH_CACHE, 1, 0);
2773 pr_err("%s: cache flush error %d\n",
2774 mmc_hostname(card->host), err);
2779 EXPORT_SYMBOL(mmc_flush_cache);
2783 /* Do the card removal on suspend if card is assumed removeable
2784 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2787 int mmc_pm_notify(struct notifier_block *notify_block,
2788 unsigned long mode, void *unused)
2790 struct mmc_host *host = container_of(
2791 notify_block, struct mmc_host, pm_notify);
2792 unsigned long flags;
2796 case PM_HIBERNATION_PREPARE:
2797 case PM_SUSPEND_PREPARE:
2798 case PM_RESTORE_PREPARE:
2799 spin_lock_irqsave(&host->lock, flags);
2800 host->rescan_disable = 1;
2801 spin_unlock_irqrestore(&host->lock, flags);
2802 cancel_delayed_work_sync(&host->detect);
2807 /* Validate prerequisites for suspend */
2808 if (host->bus_ops->pre_suspend)
2809 err = host->bus_ops->pre_suspend(host);
2813 /* Calling bus_ops->remove() with a claimed host can deadlock */
2814 host->bus_ops->remove(host);
2815 mmc_claim_host(host);
2816 mmc_detach_bus(host);
2817 mmc_power_off(host);
2818 mmc_release_host(host);
2822 case PM_POST_SUSPEND:
2823 case PM_POST_HIBERNATION:
2824 case PM_POST_RESTORE:
2826 spin_lock_irqsave(&host->lock, flags);
2827 host->rescan_disable = 0;
2828 spin_unlock_irqrestore(&host->lock, flags);
2829 _mmc_detect_change(host, 0, false);
2838 * mmc_init_context_info() - init synchronization context
2841 * Init struct context_info needed to implement asynchronous
2842 * request mechanism, used by mmc core, host driver and mmc requests
2845 void mmc_init_context_info(struct mmc_host *host)
2847 spin_lock_init(&host->context_info.lock);
2848 host->context_info.is_new_req = false;
2849 host->context_info.is_done_rcv = false;
2850 host->context_info.is_waiting_last_req = false;
2851 init_waitqueue_head(&host->context_info.wait);
2854 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2855 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2856 struct sdio_cis *cis,
2857 struct sdio_cccr *cccr,
2858 struct sdio_embedded_func *funcs,
2861 host->embedded_sdio_data.cis = cis;
2862 host->embedded_sdio_data.cccr = cccr;
2863 host->embedded_sdio_data.funcs = funcs;
2864 host->embedded_sdio_data.num_funcs = num_funcs;
2867 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2870 static int __init mmc_init(void)
2874 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2878 ret = mmc_register_bus();
2880 goto destroy_workqueue;
2882 ret = mmc_register_host_class();
2884 goto unregister_bus;
2886 ret = sdio_register_bus();
2888 goto unregister_host_class;
2892 unregister_host_class:
2893 mmc_unregister_host_class();
2895 mmc_unregister_bus();
2897 destroy_workqueue(workqueue);
2902 static void __exit mmc_exit(void)
2904 sdio_unregister_bus();
2905 mmc_unregister_host_class();
2906 mmc_unregister_bus();
2907 destroy_workqueue(workqueue);
2910 subsys_initcall(mmc_init);
2911 module_exit(mmc_exit);
2913 MODULE_LICENSE("GPL");