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 #define CREATE_TRACE_POINTS
34 #include <trace/events/mmc.h>
36 #include <linux/mmc/card.h>
37 #include <linux/mmc/host.h>
38 #include <linux/mmc/mmc.h>
39 #include <linux/mmc/sd.h>
40 #include <linux/mmc/slot-gpio.h>
52 EXPORT_TRACEPOINT_SYMBOL_GPL(mmc_blk_erase_start);
53 EXPORT_TRACEPOINT_SYMBOL_GPL(mmc_blk_erase_end);
54 EXPORT_TRACEPOINT_SYMBOL_GPL(mmc_blk_rw_start);
55 EXPORT_TRACEPOINT_SYMBOL_GPL(mmc_blk_rw_end);
57 /* If the device is not responding */
58 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
61 * Background operations can take a long time, depending on the housekeeping
62 * operations the card has to perform.
64 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
66 static struct workqueue_struct *workqueue;
67 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
70 * Enabling software CRCs on the data blocks can be a significant (30%)
71 * performance cost, and for other reasons may not always be desired.
72 * So we allow it it to be disabled.
75 module_param(use_spi_crc, bool, 0);
78 * Internal function. Schedule delayed work in the MMC work queue.
80 static int mmc_schedule_delayed_work(struct delayed_work *work,
83 return queue_delayed_work(workqueue, work, delay);
87 * Internal function. Flush all scheduled work from the MMC work queue.
89 static void mmc_flush_scheduled_work(void)
91 flush_workqueue(workqueue);
94 #ifdef CONFIG_FAIL_MMC_REQUEST
97 * Internal function. Inject random data errors.
98 * If mmc_data is NULL no errors are injected.
100 static void mmc_should_fail_request(struct mmc_host *host,
101 struct mmc_request *mrq)
103 struct mmc_command *cmd = mrq->cmd;
104 struct mmc_data *data = mrq->data;
105 static const int data_errors[] = {
114 if (cmd->error || data->error ||
115 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
118 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
119 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
122 #else /* CONFIG_FAIL_MMC_REQUEST */
124 static inline void mmc_should_fail_request(struct mmc_host *host,
125 struct mmc_request *mrq)
129 #endif /* CONFIG_FAIL_MMC_REQUEST */
132 * mmc_request_done - finish processing an MMC request
133 * @host: MMC host which completed request
134 * @mrq: MMC request which request
136 * MMC drivers should call this function when they have completed
137 * their processing of a request.
139 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
141 struct mmc_command *cmd = mrq->cmd;
142 int err = cmd->error;
144 /* Flag re-tuning needed on CRC errors */
145 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
146 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
147 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
148 (mrq->data && mrq->data->error == -EILSEQ) ||
149 (mrq->stop && mrq->stop->error == -EILSEQ)))
150 mmc_retune_needed(host);
152 if (err && cmd->retries && mmc_host_is_spi(host)) {
153 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
157 if (err && cmd->retries && !mmc_card_removed(host->card)) {
159 * Request starter must handle retries - see
160 * mmc_wait_for_req_done().
165 mmc_should_fail_request(host, mrq);
167 led_trigger_event(host->led, LED_OFF);
170 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
171 mmc_hostname(host), mrq->sbc->opcode,
173 mrq->sbc->resp[0], mrq->sbc->resp[1],
174 mrq->sbc->resp[2], mrq->sbc->resp[3]);
177 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
178 mmc_hostname(host), cmd->opcode, err,
179 cmd->resp[0], cmd->resp[1],
180 cmd->resp[2], cmd->resp[3]);
183 pr_debug("%s: %d bytes transferred: %d\n",
185 mrq->data->bytes_xfered, mrq->data->error);
186 trace_mmc_blk_rw_end(cmd->opcode, cmd->arg, mrq->data);
190 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
191 mmc_hostname(host), mrq->stop->opcode,
193 mrq->stop->resp[0], mrq->stop->resp[1],
194 mrq->stop->resp[2], mrq->stop->resp[3]);
202 EXPORT_SYMBOL(mmc_request_done);
204 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
208 /* Assumes host controller has been runtime resumed by mmc_claim_host */
209 err = mmc_retune(host);
211 mrq->cmd->error = err;
212 mmc_request_done(host, mrq);
217 * For sdio rw commands we must wait for card busy otherwise some
218 * sdio devices won't work properly.
220 if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
221 int tries = 500; /* Wait aprox 500ms at maximum */
223 while (host->ops->card_busy(host) && --tries)
227 mrq->cmd->error = -EBUSY;
228 mmc_request_done(host, mrq);
233 host->ops->request(host, mrq);
236 static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
238 #ifdef CONFIG_MMC_DEBUG
240 struct scatterlist *sg;
242 mmc_retune_hold(host);
244 if (mmc_card_removed(host->card))
248 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
249 mmc_hostname(host), mrq->sbc->opcode,
250 mrq->sbc->arg, mrq->sbc->flags);
253 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
254 mmc_hostname(host), mrq->cmd->opcode,
255 mrq->cmd->arg, mrq->cmd->flags);
258 pr_debug("%s: blksz %d blocks %d flags %08x "
259 "tsac %d ms nsac %d\n",
260 mmc_hostname(host), mrq->data->blksz,
261 mrq->data->blocks, mrq->data->flags,
262 mrq->data->timeout_ns / 1000000,
263 mrq->data->timeout_clks);
267 pr_debug("%s: CMD%u arg %08x flags %08x\n",
268 mmc_hostname(host), mrq->stop->opcode,
269 mrq->stop->arg, mrq->stop->flags);
272 WARN_ON(!host->claimed);
281 BUG_ON(mrq->data->blksz > host->max_blk_size);
282 BUG_ON(mrq->data->blocks > host->max_blk_count);
283 BUG_ON(mrq->data->blocks * mrq->data->blksz >
286 #ifdef CONFIG_MMC_DEBUG
288 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
290 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
293 mrq->cmd->data = mrq->data;
294 mrq->data->error = 0;
295 mrq->data->mrq = mrq;
297 mrq->data->stop = mrq->stop;
298 mrq->stop->error = 0;
299 mrq->stop->mrq = mrq;
302 led_trigger_event(host->led, LED_FULL);
303 __mmc_start_request(host, mrq);
309 * mmc_start_bkops - start BKOPS for supported cards
310 * @card: MMC card to start BKOPS
311 * @form_exception: A flag to indicate if this function was
312 * called due to an exception raised by the card
314 * Start background operations whenever requested.
315 * When the urgent BKOPS bit is set in a R1 command response
316 * then background operations should be started immediately.
318 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
322 bool use_busy_signal;
326 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
329 err = mmc_read_bkops_status(card);
331 pr_err("%s: Failed to read bkops status: %d\n",
332 mmc_hostname(card->host), err);
336 if (!card->ext_csd.raw_bkops_status)
339 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
343 mmc_claim_host(card->host);
344 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
345 timeout = MMC_BKOPS_MAX_TIMEOUT;
346 use_busy_signal = true;
349 use_busy_signal = false;
352 mmc_retune_hold(card->host);
354 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
355 EXT_CSD_BKOPS_START, 1, timeout,
356 use_busy_signal, true, false);
358 pr_warn("%s: Error %d starting bkops\n",
359 mmc_hostname(card->host), err);
360 mmc_retune_release(card->host);
365 * For urgent bkops status (LEVEL_2 and more)
366 * bkops executed synchronously, otherwise
367 * the operation is in progress
369 if (!use_busy_signal)
370 mmc_card_set_doing_bkops(card);
372 mmc_retune_release(card->host);
374 mmc_release_host(card->host);
376 EXPORT_SYMBOL(mmc_start_bkops);
379 * mmc_wait_data_done() - done callback for data request
380 * @mrq: done data request
382 * Wakes up mmc context, passed as a callback to host controller driver
384 static void mmc_wait_data_done(struct mmc_request *mrq)
386 struct mmc_context_info *context_info = &mrq->host->context_info;
388 context_info->is_done_rcv = true;
389 wake_up_interruptible(&context_info->wait);
392 static void mmc_wait_done(struct mmc_request *mrq)
394 complete(&mrq->completion);
398 *__mmc_start_data_req() - starts data request
399 * @host: MMC host to start the request
400 * @mrq: data request to start
402 * Sets the done callback to be called when request is completed by the card.
403 * Starts data mmc request execution
405 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
409 mrq->done = mmc_wait_data_done;
412 err = mmc_start_request(host, mrq);
414 mrq->cmd->error = err;
415 mmc_wait_data_done(mrq);
421 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
425 init_completion(&mrq->completion);
426 mrq->done = mmc_wait_done;
428 err = mmc_start_request(host, mrq);
430 mrq->cmd->error = err;
431 complete(&mrq->completion);
438 * mmc_wait_for_data_req_done() - wait for request completed
439 * @host: MMC host to prepare the command.
440 * @mrq: MMC request to wait for
442 * Blocks MMC context till host controller will ack end of data request
443 * execution or new request notification arrives from the block layer.
444 * Handles command retries.
446 * Returns enum mmc_blk_status after checking errors.
448 static int mmc_wait_for_data_req_done(struct mmc_host *host,
449 struct mmc_request *mrq,
450 struct mmc_async_req *next_req)
452 struct mmc_command *cmd;
453 struct mmc_context_info *context_info = &host->context_info;
458 wait_event_interruptible(context_info->wait,
459 (context_info->is_done_rcv ||
460 context_info->is_new_req));
461 spin_lock_irqsave(&context_info->lock, flags);
462 context_info->is_waiting_last_req = false;
463 spin_unlock_irqrestore(&context_info->lock, flags);
464 if (context_info->is_done_rcv) {
465 context_info->is_done_rcv = false;
466 context_info->is_new_req = false;
469 if (!cmd->error || !cmd->retries ||
470 mmc_card_removed(host->card)) {
471 err = host->areq->err_check(host->card,
473 break; /* return err */
475 mmc_retune_recheck(host);
476 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
478 cmd->opcode, cmd->error);
481 __mmc_start_request(host, mrq);
482 continue; /* wait for done/new event again */
484 } else if (context_info->is_new_req) {
485 context_info->is_new_req = false;
487 return MMC_BLK_NEW_REQUEST;
490 mmc_retune_release(host);
494 static void mmc_wait_for_req_done(struct mmc_host *host,
495 struct mmc_request *mrq)
497 struct mmc_command *cmd;
500 wait_for_completion(&mrq->completion);
505 * If host has timed out waiting for the sanitize
506 * to complete, card might be still in programming state
507 * so let's try to bring the card out of programming
510 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
511 if (!mmc_interrupt_hpi(host->card)) {
512 pr_warn("%s: %s: Interrupted sanitize\n",
513 mmc_hostname(host), __func__);
517 pr_err("%s: %s: Failed to interrupt sanitize\n",
518 mmc_hostname(host), __func__);
521 if (!cmd->error || !cmd->retries ||
522 mmc_card_removed(host->card))
525 mmc_retune_recheck(host);
527 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
528 mmc_hostname(host), cmd->opcode, cmd->error);
531 __mmc_start_request(host, mrq);
534 mmc_retune_release(host);
538 * mmc_pre_req - Prepare for a new request
539 * @host: MMC host to prepare command
540 * @mrq: MMC request to prepare for
541 * @is_first_req: true if there is no previous started request
542 * that may run in parellel to this call, otherwise false
544 * mmc_pre_req() is called in prior to mmc_start_req() to let
545 * host prepare for the new request. Preparation of a request may be
546 * performed while another request is running on the host.
548 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
551 if (host->ops->pre_req)
552 host->ops->pre_req(host, mrq, is_first_req);
556 * mmc_post_req - Post process a completed request
557 * @host: MMC host to post process command
558 * @mrq: MMC request to post process for
559 * @err: Error, if non zero, clean up any resources made in pre_req
561 * Let the host post process a completed request. Post processing of
562 * a request may be performed while another reuqest is running.
564 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
567 if (host->ops->post_req)
568 host->ops->post_req(host, mrq, err);
572 * mmc_start_req - start a non-blocking request
573 * @host: MMC host to start command
574 * @areq: async request to start
575 * @error: out parameter returns 0 for success, otherwise non zero
577 * Start a new MMC custom command request for a host.
578 * If there is on ongoing async request wait for completion
579 * of that request and start the new one and return.
580 * Does not wait for the new request to complete.
582 * Returns the completed request, NULL in case of none completed.
583 * Wait for the an ongoing request (previoulsy started) to complete and
584 * return the completed request. If there is no ongoing request, NULL
585 * is returned without waiting. NULL is not an error condition.
587 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
588 struct mmc_async_req *areq, int *error)
592 struct mmc_async_req *data = host->areq;
594 /* Prepare a new request */
596 mmc_pre_req(host, areq->mrq, !host->areq);
599 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
600 if (err == MMC_BLK_NEW_REQUEST) {
604 * The previous request was not completed,
610 * Check BKOPS urgency for each R1 response
612 if (host->card && mmc_card_mmc(host->card) &&
613 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
614 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
615 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
617 /* Cancel the prepared request */
619 mmc_post_req(host, areq->mrq, -EINVAL);
621 mmc_start_bkops(host->card, true);
623 /* prepare the request again */
625 mmc_pre_req(host, areq->mrq, !host->areq);
630 trace_mmc_blk_rw_start(areq->mrq->cmd->opcode,
633 start_err = __mmc_start_data_req(host, areq->mrq);
637 mmc_post_req(host, host->areq->mrq, 0);
639 /* Cancel a prepared request if it was not started. */
640 if ((err || start_err) && areq)
641 mmc_post_req(host, areq->mrq, -EINVAL);
652 EXPORT_SYMBOL(mmc_start_req);
655 * mmc_wait_for_req - start a request and wait for completion
656 * @host: MMC host to start command
657 * @mrq: MMC request to start
659 * Start a new MMC custom command request for a host, and wait
660 * for the command to complete. Does not attempt to parse the
663 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
665 __mmc_start_req(host, mrq);
666 mmc_wait_for_req_done(host, mrq);
668 EXPORT_SYMBOL(mmc_wait_for_req);
671 * mmc_interrupt_hpi - Issue for High priority Interrupt
672 * @card: the MMC card associated with the HPI transfer
674 * Issued High Priority Interrupt, and check for card status
675 * until out-of prg-state.
677 int mmc_interrupt_hpi(struct mmc_card *card)
681 unsigned long prg_wait;
685 if (!card->ext_csd.hpi_en) {
686 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
690 mmc_claim_host(card->host);
691 err = mmc_send_status(card, &status);
693 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
697 switch (R1_CURRENT_STATE(status)) {
703 * In idle and transfer states, HPI is not needed and the caller
704 * can issue the next intended command immediately
710 /* In all other states, it's illegal to issue HPI */
711 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
712 mmc_hostname(card->host), R1_CURRENT_STATE(status));
717 err = mmc_send_hpi_cmd(card, &status);
721 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
723 err = mmc_send_status(card, &status);
725 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
727 if (time_after(jiffies, prg_wait))
732 mmc_release_host(card->host);
735 EXPORT_SYMBOL(mmc_interrupt_hpi);
738 * mmc_wait_for_cmd - start a command and wait for completion
739 * @host: MMC host to start command
740 * @cmd: MMC command to start
741 * @retries: maximum number of retries
743 * Start a new MMC command for a host, and wait for the command
744 * to complete. Return any error that occurred while the command
745 * was executing. Do not attempt to parse the response.
747 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
749 struct mmc_request mrq = {NULL};
751 WARN_ON(!host->claimed);
753 memset(cmd->resp, 0, sizeof(cmd->resp));
754 cmd->retries = retries;
759 mmc_wait_for_req(host, &mrq);
764 EXPORT_SYMBOL(mmc_wait_for_cmd);
767 * mmc_stop_bkops - stop ongoing BKOPS
768 * @card: MMC card to check BKOPS
770 * Send HPI command to stop ongoing background operations to
771 * allow rapid servicing of foreground operations, e.g. read/
772 * writes. Wait until the card comes out of the programming state
773 * to avoid errors in servicing read/write requests.
775 int mmc_stop_bkops(struct mmc_card *card)
780 err = mmc_interrupt_hpi(card);
783 * If err is EINVAL, we can't issue an HPI.
784 * It should complete the BKOPS.
786 if (!err || (err == -EINVAL)) {
787 mmc_card_clr_doing_bkops(card);
788 mmc_retune_release(card->host);
794 EXPORT_SYMBOL(mmc_stop_bkops);
796 int mmc_read_bkops_status(struct mmc_card *card)
801 mmc_claim_host(card->host);
802 err = mmc_get_ext_csd(card, &ext_csd);
803 mmc_release_host(card->host);
807 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
808 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
812 EXPORT_SYMBOL(mmc_read_bkops_status);
815 * mmc_set_data_timeout - set the timeout for a data command
816 * @data: data phase for command
817 * @card: the MMC card associated with the data transfer
819 * Computes the data timeout parameters according to the
820 * correct algorithm given the card type.
822 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
827 * SDIO cards only define an upper 1 s limit on access.
829 if (mmc_card_sdio(card)) {
830 data->timeout_ns = 1000000000;
831 data->timeout_clks = 0;
836 * SD cards use a 100 multiplier rather than 10
838 mult = mmc_card_sd(card) ? 100 : 10;
841 * Scale up the multiplier (and therefore the timeout) by
842 * the r2w factor for writes.
844 if (data->flags & MMC_DATA_WRITE)
845 mult <<= card->csd.r2w_factor;
847 data->timeout_ns = card->csd.tacc_ns * mult;
848 data->timeout_clks = card->csd.tacc_clks * mult;
851 * SD cards also have an upper limit on the timeout.
853 if (mmc_card_sd(card)) {
854 unsigned int timeout_us, limit_us;
856 timeout_us = data->timeout_ns / 1000;
857 if (card->host->ios.clock)
858 timeout_us += data->timeout_clks * 1000 /
859 (card->host->ios.clock / 1000);
861 if (data->flags & MMC_DATA_WRITE)
863 * The MMC spec "It is strongly recommended
864 * for hosts to implement more than 500ms
865 * timeout value even if the card indicates
866 * the 250ms maximum busy length." Even the
867 * previous value of 300ms is known to be
868 * insufficient for some cards.
875 * SDHC cards always use these fixed values.
877 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
878 data->timeout_ns = limit_us * 1000;
879 data->timeout_clks = 0;
882 /* assign limit value if invalid */
884 data->timeout_ns = limit_us * 1000;
888 * Some cards require longer data read timeout than indicated in CSD.
889 * Address this by setting the read timeout to a "reasonably high"
890 * value. For the cards tested, 300ms has proven enough. If necessary,
891 * this value can be increased if other problematic cards require this.
893 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
894 data->timeout_ns = 300000000;
895 data->timeout_clks = 0;
899 * Some cards need very high timeouts if driven in SPI mode.
900 * The worst observed timeout was 900ms after writing a
901 * continuous stream of data until the internal logic
904 if (mmc_host_is_spi(card->host)) {
905 if (data->flags & MMC_DATA_WRITE) {
906 if (data->timeout_ns < 1000000000)
907 data->timeout_ns = 1000000000; /* 1s */
909 if (data->timeout_ns < 100000000)
910 data->timeout_ns = 100000000; /* 100ms */
914 EXPORT_SYMBOL(mmc_set_data_timeout);
917 * mmc_align_data_size - pads a transfer size to a more optimal value
918 * @card: the MMC card associated with the data transfer
919 * @sz: original transfer size
921 * Pads the original data size with a number of extra bytes in
922 * order to avoid controller bugs and/or performance hits
923 * (e.g. some controllers revert to PIO for certain sizes).
925 * Returns the improved size, which might be unmodified.
927 * Note that this function is only relevant when issuing a
928 * single scatter gather entry.
930 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
933 * FIXME: We don't have a system for the controller to tell
934 * the core about its problems yet, so for now we just 32-bit
937 sz = ((sz + 3) / 4) * 4;
941 EXPORT_SYMBOL(mmc_align_data_size);
944 * __mmc_claim_host - exclusively claim a host
945 * @host: mmc host to claim
946 * @abort: whether or not the operation should be aborted
948 * Claim a host for a set of operations. If @abort is non null and
949 * dereference a non-zero value then this will return prematurely with
950 * that non-zero value without acquiring the lock. Returns zero
951 * with the lock held otherwise.
953 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
955 DECLARE_WAITQUEUE(wait, current);
962 add_wait_queue(&host->wq, &wait);
963 spin_lock_irqsave(&host->lock, flags);
965 set_current_state(TASK_UNINTERRUPTIBLE);
966 stop = abort ? atomic_read(abort) : 0;
967 if (stop || !host->claimed || host->claimer == current)
969 spin_unlock_irqrestore(&host->lock, flags);
971 spin_lock_irqsave(&host->lock, flags);
973 set_current_state(TASK_RUNNING);
976 host->claimer = current;
977 host->claim_cnt += 1;
978 if (host->claim_cnt == 1)
982 spin_unlock_irqrestore(&host->lock, flags);
983 remove_wait_queue(&host->wq, &wait);
986 pm_runtime_get_sync(mmc_dev(host));
990 EXPORT_SYMBOL(__mmc_claim_host);
993 * mmc_release_host - release a host
994 * @host: mmc host to release
996 * Release a MMC host, allowing others to claim the host
997 * for their operations.
999 void mmc_release_host(struct mmc_host *host)
1001 unsigned long flags;
1003 WARN_ON(!host->claimed);
1005 spin_lock_irqsave(&host->lock, flags);
1006 if (--host->claim_cnt) {
1007 /* Release for nested claim */
1008 spin_unlock_irqrestore(&host->lock, flags);
1011 host->claimer = NULL;
1012 spin_unlock_irqrestore(&host->lock, flags);
1014 pm_runtime_mark_last_busy(mmc_dev(host));
1015 pm_runtime_put_autosuspend(mmc_dev(host));
1018 EXPORT_SYMBOL(mmc_release_host);
1021 * This is a helper function, which fetches a runtime pm reference for the
1022 * card device and also claims the host.
1024 void mmc_get_card(struct mmc_card *card)
1026 pm_runtime_get_sync(&card->dev);
1027 mmc_claim_host(card->host);
1029 EXPORT_SYMBOL(mmc_get_card);
1032 * This is a helper function, which releases the host and drops the runtime
1033 * pm reference for the card device.
1035 void mmc_put_card(struct mmc_card *card)
1037 mmc_release_host(card->host);
1038 pm_runtime_mark_last_busy(&card->dev);
1039 pm_runtime_put_autosuspend(&card->dev);
1041 EXPORT_SYMBOL(mmc_put_card);
1044 * Internal function that does the actual ios call to the host driver,
1045 * optionally printing some debug output.
1047 static inline void mmc_set_ios(struct mmc_host *host)
1049 struct mmc_ios *ios = &host->ios;
1051 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1052 "width %u timing %u\n",
1053 mmc_hostname(host), ios->clock, ios->bus_mode,
1054 ios->power_mode, ios->chip_select, ios->vdd,
1055 ios->bus_width, ios->timing);
1057 host->ops->set_ios(host, ios);
1061 * Control chip select pin on a host.
1063 void mmc_set_chip_select(struct mmc_host *host, int mode)
1065 host->ios.chip_select = mode;
1070 * Sets the host clock to the highest possible frequency that
1073 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1075 WARN_ON(hz && hz < host->f_min);
1077 if (hz > host->f_max)
1080 host->ios.clock = hz;
1084 int mmc_execute_tuning(struct mmc_card *card)
1086 struct mmc_host *host = card->host;
1090 if (!host->ops->execute_tuning)
1093 if (mmc_card_mmc(card))
1094 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1096 opcode = MMC_SEND_TUNING_BLOCK;
1098 err = host->ops->execute_tuning(host, opcode);
1101 pr_err("%s: tuning execution failed\n", mmc_hostname(host));
1103 mmc_retune_enable(host);
1109 * Change the bus mode (open drain/push-pull) of a host.
1111 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1113 host->ios.bus_mode = mode;
1118 * Change data bus width of a host.
1120 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1122 host->ios.bus_width = width;
1127 * Set initial state after a power cycle or a hw_reset.
1129 void mmc_set_initial_state(struct mmc_host *host)
1131 mmc_retune_disable(host);
1133 if (mmc_host_is_spi(host))
1134 host->ios.chip_select = MMC_CS_HIGH;
1136 host->ios.chip_select = MMC_CS_DONTCARE;
1137 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1138 host->ios.bus_width = MMC_BUS_WIDTH_1;
1139 host->ios.timing = MMC_TIMING_LEGACY;
1140 host->ios.drv_type = 0;
1146 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1147 * @vdd: voltage (mV)
1148 * @low_bits: prefer low bits in boundary cases
1150 * This function returns the OCR bit number according to the provided @vdd
1151 * value. If conversion is not possible a negative errno value returned.
1153 * Depending on the @low_bits flag the function prefers low or high OCR bits
1154 * on boundary voltages. For example,
1155 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1156 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1158 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1160 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1162 const int max_bit = ilog2(MMC_VDD_35_36);
1165 if (vdd < 1650 || vdd > 3600)
1168 if (vdd >= 1650 && vdd <= 1950)
1169 return ilog2(MMC_VDD_165_195);
1174 /* Base 2000 mV, step 100 mV, bit's base 8. */
1175 bit = (vdd - 2000) / 100 + 8;
1182 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1183 * @vdd_min: minimum voltage value (mV)
1184 * @vdd_max: maximum voltage value (mV)
1186 * This function returns the OCR mask bits according to the provided @vdd_min
1187 * and @vdd_max values. If conversion is not possible the function returns 0.
1189 * Notes wrt boundary cases:
1190 * This function sets the OCR bits for all boundary voltages, for example
1191 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1192 * MMC_VDD_34_35 mask.
1194 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1198 if (vdd_max < vdd_min)
1201 /* Prefer high bits for the boundary vdd_max values. */
1202 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1206 /* Prefer low bits for the boundary vdd_min values. */
1207 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1211 /* Fill the mask, from max bit to min bit. */
1212 while (vdd_max >= vdd_min)
1213 mask |= 1 << vdd_max--;
1217 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1222 * mmc_of_parse_voltage - return mask of supported voltages
1223 * @np: The device node need to be parsed.
1224 * @mask: mask of voltages available for MMC/SD/SDIO
1226 * 1. Return zero on success.
1227 * 2. Return negative errno: voltage-range is invalid.
1229 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1231 const u32 *voltage_ranges;
1234 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1235 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1236 if (!voltage_ranges || !num_ranges) {
1237 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1241 for (i = 0; i < num_ranges; i++) {
1242 const int j = i * 2;
1245 ocr_mask = mmc_vddrange_to_ocrmask(
1246 be32_to_cpu(voltage_ranges[j]),
1247 be32_to_cpu(voltage_ranges[j + 1]));
1249 pr_err("%s: voltage-range #%d is invalid\n",
1258 EXPORT_SYMBOL(mmc_of_parse_voltage);
1260 #endif /* CONFIG_OF */
1262 static int mmc_of_get_func_num(struct device_node *node)
1267 ret = of_property_read_u32(node, "reg", ®);
1274 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1277 struct device_node *node;
1279 if (!host->parent || !host->parent->of_node)
1282 for_each_child_of_node(host->parent->of_node, node) {
1283 if (mmc_of_get_func_num(node) == func_num)
1290 #ifdef CONFIG_REGULATOR
1293 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1294 * @vdd_bit: OCR bit number
1295 * @min_uV: minimum voltage value (mV)
1296 * @max_uV: maximum voltage value (mV)
1298 * This function returns the voltage range according to the provided OCR
1299 * bit number. If conversion is not possible a negative errno value returned.
1301 static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1309 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1310 * bits this regulator doesn't quite support ... don't
1311 * be too picky, most cards and regulators are OK with
1312 * a 0.1V range goof (it's a small error percentage).
1314 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1316 *min_uV = 1650 * 1000;
1317 *max_uV = 1950 * 1000;
1319 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1320 *max_uV = *min_uV + 100 * 1000;
1327 * mmc_regulator_get_ocrmask - return mask of supported voltages
1328 * @supply: regulator to use
1330 * This returns either a negative errno, or a mask of voltages that
1331 * can be provided to MMC/SD/SDIO devices using the specified voltage
1332 * regulator. This would normally be called before registering the
1335 int mmc_regulator_get_ocrmask(struct regulator *supply)
1343 count = regulator_count_voltages(supply);
1347 for (i = 0; i < count; i++) {
1348 vdd_uV = regulator_list_voltage(supply, i);
1352 vdd_mV = vdd_uV / 1000;
1353 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1357 vdd_uV = regulator_get_voltage(supply);
1361 vdd_mV = vdd_uV / 1000;
1362 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1367 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1370 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1371 * @mmc: the host to regulate
1372 * @supply: regulator to use
1373 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1375 * Returns zero on success, else negative errno.
1377 * MMC host drivers may use this to enable or disable a regulator using
1378 * a particular supply voltage. This would normally be called from the
1381 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1382 struct regulator *supply,
1383 unsigned short vdd_bit)
1389 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1391 result = regulator_set_voltage(supply, min_uV, max_uV);
1392 if (result == 0 && !mmc->regulator_enabled) {
1393 result = regulator_enable(supply);
1395 mmc->regulator_enabled = true;
1397 } else if (mmc->regulator_enabled) {
1398 result = regulator_disable(supply);
1400 mmc->regulator_enabled = false;
1404 dev_err(mmc_dev(mmc),
1405 "could not set regulator OCR (%d)\n", result);
1408 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1410 static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1411 int min_uV, int target_uV,
1415 * Check if supported first to avoid errors since we may try several
1416 * signal levels during power up and don't want to show errors.
1418 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1421 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1426 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1428 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1429 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1430 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1431 * SD card spec also define VQMMC in terms of VMMC.
1432 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1434 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1435 * requested voltage. This is definitely a good idea for UHS where there's a
1436 * separate regulator on the card that's trying to make 1.8V and it's best if
1439 * This function is expected to be used by a controller's
1440 * start_signal_voltage_switch() function.
1442 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1444 struct device *dev = mmc_dev(mmc);
1445 int ret, volt, min_uV, max_uV;
1447 /* If no vqmmc supply then we can't change the voltage */
1448 if (IS_ERR(mmc->supply.vqmmc))
1451 switch (ios->signal_voltage) {
1452 case MMC_SIGNAL_VOLTAGE_120:
1453 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1454 1100000, 1200000, 1300000);
1455 case MMC_SIGNAL_VOLTAGE_180:
1456 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1457 1700000, 1800000, 1950000);
1458 case MMC_SIGNAL_VOLTAGE_330:
1459 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1463 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1464 __func__, volt, max_uV);
1466 min_uV = max(volt - 300000, 2700000);
1467 max_uV = min(max_uV + 200000, 3600000);
1470 * Due to a limitation in the current implementation of
1471 * regulator_set_voltage_triplet() which is taking the lowest
1472 * voltage possible if below the target, search for a suitable
1473 * voltage in two steps and try to stay close to vmmc
1474 * with a 0.3V tolerance at first.
1476 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1477 min_uV, volt, max_uV))
1480 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1481 2700000, volt, 3600000);
1486 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1488 #endif /* CONFIG_REGULATOR */
1490 int mmc_regulator_get_supply(struct mmc_host *mmc)
1492 struct device *dev = mmc_dev(mmc);
1495 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1496 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1498 if (IS_ERR(mmc->supply.vmmc)) {
1499 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1500 return -EPROBE_DEFER;
1501 dev_info(dev, "No vmmc regulator found\n");
1503 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1505 mmc->ocr_avail = ret;
1507 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1510 if (IS_ERR(mmc->supply.vqmmc)) {
1511 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1512 return -EPROBE_DEFER;
1513 dev_info(dev, "No vqmmc regulator found\n");
1518 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1521 * Mask off any voltages we don't support and select
1522 * the lowest voltage
1524 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1529 * Sanity check the voltages that the card claims to
1533 dev_warn(mmc_dev(host),
1534 "card claims to support voltages below defined range\n");
1538 ocr &= host->ocr_avail;
1540 dev_warn(mmc_dev(host), "no support for card's volts\n");
1544 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1547 mmc_power_cycle(host, ocr);
1551 if (bit != host->ios.vdd)
1552 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1558 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1561 int old_signal_voltage = host->ios.signal_voltage;
1563 host->ios.signal_voltage = signal_voltage;
1564 if (host->ops->start_signal_voltage_switch)
1565 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1568 host->ios.signal_voltage = old_signal_voltage;
1574 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1576 struct mmc_command cmd = {0};
1583 * Send CMD11 only if the request is to switch the card to
1586 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1587 return __mmc_set_signal_voltage(host, signal_voltage);
1590 * If we cannot switch voltages, return failure so the caller
1591 * can continue without UHS mode
1593 if (!host->ops->start_signal_voltage_switch)
1595 if (!host->ops->card_busy)
1596 pr_warn("%s: cannot verify signal voltage switch\n",
1597 mmc_hostname(host));
1599 cmd.opcode = SD_SWITCH_VOLTAGE;
1601 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1603 err = mmc_wait_for_cmd(host, &cmd, 0);
1607 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1611 * The card should drive cmd and dat[0:3] low immediately
1612 * after the response of cmd11, but wait 1 ms to be sure
1615 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1620 * During a signal voltage level switch, the clock must be gated
1621 * for 5 ms according to the SD spec
1623 clock = host->ios.clock;
1624 host->ios.clock = 0;
1627 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1629 * Voltages may not have been switched, but we've already
1630 * sent CMD11, so a power cycle is required anyway
1636 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1638 host->ios.clock = clock;
1641 /* Wait for at least 1 ms according to spec */
1645 * Failure to switch is indicated by the card holding
1648 if (host->ops->card_busy && host->ops->card_busy(host))
1653 pr_debug("%s: Signal voltage switch failed, "
1654 "power cycling card\n", mmc_hostname(host));
1655 mmc_power_cycle(host, ocr);
1662 * Select timing parameters for host.
1664 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1666 host->ios.timing = timing;
1671 * Select appropriate driver type for host.
1673 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1675 host->ios.drv_type = drv_type;
1679 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1680 int card_drv_type, int *drv_type)
1682 struct mmc_host *host = card->host;
1683 int host_drv_type = SD_DRIVER_TYPE_B;
1687 if (!host->ops->select_drive_strength)
1690 /* Use SD definition of driver strength for hosts */
1691 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1692 host_drv_type |= SD_DRIVER_TYPE_A;
1694 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1695 host_drv_type |= SD_DRIVER_TYPE_C;
1697 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1698 host_drv_type |= SD_DRIVER_TYPE_D;
1701 * The drive strength that the hardware can support
1702 * depends on the board design. Pass the appropriate
1703 * information and let the hardware specific code
1704 * return what is possible given the options
1706 return host->ops->select_drive_strength(card, max_dtr,
1713 * Apply power to the MMC stack. This is a two-stage process.
1714 * First, we enable power to the card without the clock running.
1715 * We then wait a bit for the power to stabilise. Finally,
1716 * enable the bus drivers and clock to the card.
1718 * We must _NOT_ enable the clock prior to power stablising.
1720 * If a host does all the power sequencing itself, ignore the
1721 * initial MMC_POWER_UP stage.
1723 void mmc_power_up(struct mmc_host *host, u32 ocr)
1725 if (host->ios.power_mode == MMC_POWER_ON)
1728 mmc_pwrseq_pre_power_on(host);
1730 host->ios.vdd = fls(ocr) - 1;
1731 host->ios.power_mode = MMC_POWER_UP;
1732 /* Set initial state and call mmc_set_ios */
1733 mmc_set_initial_state(host);
1735 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1736 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1737 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1738 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1739 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1740 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1741 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1744 * This delay should be sufficient to allow the power supply
1745 * to reach the minimum voltage.
1749 mmc_pwrseq_post_power_on(host);
1751 host->ios.clock = host->f_init;
1753 host->ios.power_mode = MMC_POWER_ON;
1757 * This delay must be at least 74 clock sizes, or 1 ms, or the
1758 * time required to reach a stable voltage.
1763 void mmc_power_off(struct mmc_host *host)
1765 if (host->ios.power_mode == MMC_POWER_OFF)
1768 mmc_pwrseq_power_off(host);
1770 host->ios.clock = 0;
1773 host->ios.power_mode = MMC_POWER_OFF;
1774 /* Set initial state and call mmc_set_ios */
1775 mmc_set_initial_state(host);
1778 * Some configurations, such as the 802.11 SDIO card in the OLPC
1779 * XO-1.5, require a short delay after poweroff before the card
1780 * can be successfully turned on again.
1785 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1787 mmc_power_off(host);
1788 /* Wait at least 1 ms according to SD spec */
1790 mmc_power_up(host, ocr);
1794 * Cleanup when the last reference to the bus operator is dropped.
1796 static void __mmc_release_bus(struct mmc_host *host)
1799 BUG_ON(host->bus_refs);
1800 BUG_ON(!host->bus_dead);
1802 host->bus_ops = NULL;
1806 * Increase reference count of bus operator
1808 static inline void mmc_bus_get(struct mmc_host *host)
1810 unsigned long flags;
1812 spin_lock_irqsave(&host->lock, flags);
1814 spin_unlock_irqrestore(&host->lock, flags);
1818 * Decrease reference count of bus operator and free it if
1819 * it is the last reference.
1821 static inline void mmc_bus_put(struct mmc_host *host)
1823 unsigned long flags;
1825 spin_lock_irqsave(&host->lock, flags);
1827 if ((host->bus_refs == 0) && host->bus_ops)
1828 __mmc_release_bus(host);
1829 spin_unlock_irqrestore(&host->lock, flags);
1833 * Assign a mmc bus handler to a host. Only one bus handler may control a
1834 * host at any given time.
1836 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1838 unsigned long flags;
1843 WARN_ON(!host->claimed);
1845 spin_lock_irqsave(&host->lock, flags);
1847 BUG_ON(host->bus_ops);
1848 BUG_ON(host->bus_refs);
1850 host->bus_ops = ops;
1854 spin_unlock_irqrestore(&host->lock, flags);
1858 * Remove the current bus handler from a host.
1860 void mmc_detach_bus(struct mmc_host *host)
1862 unsigned long flags;
1866 WARN_ON(!host->claimed);
1867 WARN_ON(!host->bus_ops);
1869 spin_lock_irqsave(&host->lock, flags);
1873 spin_unlock_irqrestore(&host->lock, flags);
1878 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1881 #ifdef CONFIG_MMC_DEBUG
1882 unsigned long flags;
1883 spin_lock_irqsave(&host->lock, flags);
1884 WARN_ON(host->removed);
1885 spin_unlock_irqrestore(&host->lock, flags);
1889 * If the device is configured as wakeup, we prevent a new sleep for
1890 * 5 s to give provision for user space to consume the event.
1892 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1893 device_can_wakeup(mmc_dev(host)))
1894 pm_wakeup_event(mmc_dev(host), 5000);
1896 host->detect_change = 1;
1897 mmc_schedule_delayed_work(&host->detect, delay);
1901 * mmc_detect_change - process change of state on a MMC socket
1902 * @host: host which changed state.
1903 * @delay: optional delay to wait before detection (jiffies)
1905 * MMC drivers should call this when they detect a card has been
1906 * inserted or removed. The MMC layer will confirm that any
1907 * present card is still functional, and initialize any newly
1910 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1912 _mmc_detect_change(host, delay, true);
1914 EXPORT_SYMBOL(mmc_detect_change);
1916 void mmc_init_erase(struct mmc_card *card)
1920 if (is_power_of_2(card->erase_size))
1921 card->erase_shift = ffs(card->erase_size) - 1;
1923 card->erase_shift = 0;
1926 * It is possible to erase an arbitrarily large area of an SD or MMC
1927 * card. That is not desirable because it can take a long time
1928 * (minutes) potentially delaying more important I/O, and also the
1929 * timeout calculations become increasingly hugely over-estimated.
1930 * Consequently, 'pref_erase' is defined as a guide to limit erases
1931 * to that size and alignment.
1933 * For SD cards that define Allocation Unit size, limit erases to one
1934 * Allocation Unit at a time. For MMC cards that define High Capacity
1935 * Erase Size, whether it is switched on or not, limit to that size.
1936 * Otherwise just have a stab at a good value. For modern cards it
1937 * will end up being 4MiB. Note that if the value is too small, it
1938 * can end up taking longer to erase.
1940 if (mmc_card_sd(card) && card->ssr.au) {
1941 card->pref_erase = card->ssr.au;
1942 card->erase_shift = ffs(card->ssr.au) - 1;
1943 } else if (card->ext_csd.hc_erase_size) {
1944 card->pref_erase = card->ext_csd.hc_erase_size;
1945 } else if (card->erase_size) {
1946 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1948 card->pref_erase = 512 * 1024 / 512;
1950 card->pref_erase = 1024 * 1024 / 512;
1952 card->pref_erase = 2 * 1024 * 1024 / 512;
1954 card->pref_erase = 4 * 1024 * 1024 / 512;
1955 if (card->pref_erase < card->erase_size)
1956 card->pref_erase = card->erase_size;
1958 sz = card->pref_erase % card->erase_size;
1960 card->pref_erase += card->erase_size - sz;
1963 card->pref_erase = 0;
1966 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1967 unsigned int arg, unsigned int qty)
1969 unsigned int erase_timeout;
1971 if (arg == MMC_DISCARD_ARG ||
1972 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1973 erase_timeout = card->ext_csd.trim_timeout;
1974 } else if (card->ext_csd.erase_group_def & 1) {
1975 /* High Capacity Erase Group Size uses HC timeouts */
1976 if (arg == MMC_TRIM_ARG)
1977 erase_timeout = card->ext_csd.trim_timeout;
1979 erase_timeout = card->ext_csd.hc_erase_timeout;
1981 /* CSD Erase Group Size uses write timeout */
1982 unsigned int mult = (10 << card->csd.r2w_factor);
1983 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1984 unsigned int timeout_us;
1986 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1987 if (card->csd.tacc_ns < 1000000)
1988 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1990 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1993 * ios.clock is only a target. The real clock rate might be
1994 * less but not that much less, so fudge it by multiplying by 2.
1997 timeout_us += (timeout_clks * 1000) /
1998 (card->host->ios.clock / 1000);
2000 erase_timeout = timeout_us / 1000;
2003 * Theoretically, the calculation could underflow so round up
2004 * to 1ms in that case.
2010 /* Multiplier for secure operations */
2011 if (arg & MMC_SECURE_ARGS) {
2012 if (arg == MMC_SECURE_ERASE_ARG)
2013 erase_timeout *= card->ext_csd.sec_erase_mult;
2015 erase_timeout *= card->ext_csd.sec_trim_mult;
2018 erase_timeout *= qty;
2021 * Ensure at least a 1 second timeout for SPI as per
2022 * 'mmc_set_data_timeout()'
2024 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2025 erase_timeout = 1000;
2027 return erase_timeout;
2030 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2034 unsigned int erase_timeout;
2036 if (card->ssr.erase_timeout) {
2037 /* Erase timeout specified in SD Status Register (SSR) */
2038 erase_timeout = card->ssr.erase_timeout * qty +
2039 card->ssr.erase_offset;
2042 * Erase timeout not specified in SD Status Register (SSR) so
2043 * use 250ms per write block.
2045 erase_timeout = 250 * qty;
2048 /* Must not be less than 1 second */
2049 if (erase_timeout < 1000)
2050 erase_timeout = 1000;
2052 return erase_timeout;
2055 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2059 if (mmc_card_sd(card))
2060 return mmc_sd_erase_timeout(card, arg, qty);
2062 return mmc_mmc_erase_timeout(card, arg, qty);
2065 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2066 unsigned int to, unsigned int arg)
2068 struct mmc_command cmd = {0};
2069 unsigned int qty = 0;
2070 unsigned long timeout;
2071 unsigned int fr, nr;
2076 trace_mmc_blk_erase_start(arg, fr, nr);
2078 mmc_retune_hold(card->host);
2081 * qty is used to calculate the erase timeout which depends on how many
2082 * erase groups (or allocation units in SD terminology) are affected.
2083 * We count erasing part of an erase group as one erase group.
2084 * For SD, the allocation units are always a power of 2. For MMC, the
2085 * erase group size is almost certainly also power of 2, but it does not
2086 * seem to insist on that in the JEDEC standard, so we fall back to
2087 * division in that case. SD may not specify an allocation unit size,
2088 * in which case the timeout is based on the number of write blocks.
2090 * Note that the timeout for secure trim 2 will only be correct if the
2091 * number of erase groups specified is the same as the total of all
2092 * preceding secure trim 1 commands. Since the power may have been
2093 * lost since the secure trim 1 commands occurred, it is generally
2094 * impossible to calculate the secure trim 2 timeout correctly.
2096 if (card->erase_shift)
2097 qty += ((to >> card->erase_shift) -
2098 (from >> card->erase_shift)) + 1;
2099 else if (mmc_card_sd(card))
2100 qty += to - from + 1;
2102 qty += ((to / card->erase_size) -
2103 (from / card->erase_size)) + 1;
2105 if (!mmc_card_blockaddr(card)) {
2110 if (mmc_card_sd(card))
2111 cmd.opcode = SD_ERASE_WR_BLK_START;
2113 cmd.opcode = MMC_ERASE_GROUP_START;
2115 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2116 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2118 pr_err("mmc_erase: group start error %d, "
2119 "status %#x\n", err, cmd.resp[0]);
2124 memset(&cmd, 0, sizeof(struct mmc_command));
2125 if (mmc_card_sd(card))
2126 cmd.opcode = SD_ERASE_WR_BLK_END;
2128 cmd.opcode = MMC_ERASE_GROUP_END;
2130 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2131 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2133 pr_err("mmc_erase: group end error %d, status %#x\n",
2139 memset(&cmd, 0, sizeof(struct mmc_command));
2140 cmd.opcode = MMC_ERASE;
2142 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2143 cmd.busy_timeout = mmc_erase_timeout(card, arg, qty);
2144 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2146 pr_err("mmc_erase: erase error %d, status %#x\n",
2152 if (mmc_host_is_spi(card->host))
2155 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2157 memset(&cmd, 0, sizeof(struct mmc_command));
2158 cmd.opcode = MMC_SEND_STATUS;
2159 cmd.arg = card->rca << 16;
2160 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2161 /* Do not retry else we can't see errors */
2162 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2163 if (err || (cmd.resp[0] & 0xFDF92000)) {
2164 pr_err("error %d requesting status %#x\n",
2170 /* Timeout if the device never becomes ready for data and
2171 * never leaves the program state.
2173 if (time_after(jiffies, timeout)) {
2174 pr_err("%s: Card stuck in programming state! %s\n",
2175 mmc_hostname(card->host), __func__);
2180 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2181 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2183 mmc_retune_release(card->host);
2184 trace_mmc_blk_erase_end(arg, fr, nr);
2189 * mmc_erase - erase sectors.
2190 * @card: card to erase
2191 * @from: first sector to erase
2192 * @nr: number of sectors to erase
2193 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2195 * Caller must claim host before calling this function.
2197 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2200 unsigned int rem, to = from + nr;
2203 if (!(card->host->caps & MMC_CAP_ERASE) ||
2204 !(card->csd.cmdclass & CCC_ERASE))
2207 if (!card->erase_size)
2210 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2213 if ((arg & MMC_SECURE_ARGS) &&
2214 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2217 if ((arg & MMC_TRIM_ARGS) &&
2218 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2221 if (arg == MMC_SECURE_ERASE_ARG) {
2222 if (from % card->erase_size || nr % card->erase_size)
2226 if (arg == MMC_ERASE_ARG) {
2227 rem = from % card->erase_size;
2229 rem = card->erase_size - rem;
2236 rem = nr % card->erase_size;
2249 /* 'from' and 'to' are inclusive */
2253 * Special case where only one erase-group fits in the timeout budget:
2254 * If the region crosses an erase-group boundary on this particular
2255 * case, we will be trimming more than one erase-group which, does not
2256 * fit in the timeout budget of the controller, so we need to split it
2257 * and call mmc_do_erase() twice if necessary. This special case is
2258 * identified by the card->eg_boundary flag.
2260 rem = card->erase_size - (from % card->erase_size);
2261 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2262 err = mmc_do_erase(card, from, from + rem - 1, arg);
2264 if ((err) || (to <= from))
2268 return mmc_do_erase(card, from, to, arg);
2270 EXPORT_SYMBOL(mmc_erase);
2272 int mmc_can_erase(struct mmc_card *card)
2274 if ((card->host->caps & MMC_CAP_ERASE) &&
2275 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2279 EXPORT_SYMBOL(mmc_can_erase);
2281 int mmc_can_trim(struct mmc_card *card)
2283 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2284 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2288 EXPORT_SYMBOL(mmc_can_trim);
2290 int mmc_can_discard(struct mmc_card *card)
2293 * As there's no way to detect the discard support bit at v4.5
2294 * use the s/w feature support filed.
2296 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2300 EXPORT_SYMBOL(mmc_can_discard);
2302 int mmc_can_sanitize(struct mmc_card *card)
2304 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2306 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2310 EXPORT_SYMBOL(mmc_can_sanitize);
2312 int mmc_can_secure_erase_trim(struct mmc_card *card)
2314 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2315 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2319 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2321 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2324 if (!card->erase_size)
2326 if (from % card->erase_size || nr % card->erase_size)
2330 EXPORT_SYMBOL(mmc_erase_group_aligned);
2332 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2335 struct mmc_host *host = card->host;
2336 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2337 unsigned int last_timeout = 0;
2339 if (card->erase_shift)
2340 max_qty = UINT_MAX >> card->erase_shift;
2341 else if (mmc_card_sd(card))
2344 max_qty = UINT_MAX / card->erase_size;
2346 /* Find the largest qty with an OK timeout */
2349 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2350 timeout = mmc_erase_timeout(card, arg, qty + x);
2351 if (timeout > host->max_busy_timeout)
2353 if (timeout < last_timeout)
2355 last_timeout = timeout;
2365 * When specifying a sector range to trim, chances are we might cross
2366 * an erase-group boundary even if the amount of sectors is less than
2368 * If we can only fit one erase-group in the controller timeout budget,
2369 * we have to care that erase-group boundaries are not crossed by a
2370 * single trim operation. We flag that special case with "eg_boundary".
2371 * In all other cases we can just decrement qty and pretend that we
2372 * always touch (qty + 1) erase-groups as a simple optimization.
2375 card->eg_boundary = 1;
2379 /* Convert qty to sectors */
2380 if (card->erase_shift)
2381 max_discard = qty << card->erase_shift;
2382 else if (mmc_card_sd(card))
2383 max_discard = qty + 1;
2385 max_discard = qty * card->erase_size;
2390 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2392 struct mmc_host *host = card->host;
2393 unsigned int max_discard, max_trim;
2395 if (!host->max_busy_timeout)
2399 * Without erase_group_def set, MMC erase timeout depends on clock
2400 * frequence which can change. In that case, the best choice is
2401 * just the preferred erase size.
2403 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2404 return card->pref_erase;
2406 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2407 if (mmc_can_trim(card)) {
2408 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2409 if (max_trim < max_discard)
2410 max_discard = max_trim;
2411 } else if (max_discard < card->erase_size) {
2414 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2415 mmc_hostname(host), max_discard, host->max_busy_timeout);
2418 EXPORT_SYMBOL(mmc_calc_max_discard);
2420 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2422 struct mmc_command cmd = {0};
2424 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card))
2427 cmd.opcode = MMC_SET_BLOCKLEN;
2429 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2430 return mmc_wait_for_cmd(card->host, &cmd, 5);
2432 EXPORT_SYMBOL(mmc_set_blocklen);
2434 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2437 struct mmc_command cmd = {0};
2439 cmd.opcode = MMC_SET_BLOCK_COUNT;
2440 cmd.arg = blockcount & 0x0000FFFF;
2443 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2444 return mmc_wait_for_cmd(card->host, &cmd, 5);
2446 EXPORT_SYMBOL(mmc_set_blockcount);
2448 static void mmc_hw_reset_for_init(struct mmc_host *host)
2450 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2452 host->ops->hw_reset(host);
2455 int mmc_hw_reset(struct mmc_host *host)
2463 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2468 ret = host->bus_ops->reset(host);
2471 if (ret != -EOPNOTSUPP)
2472 pr_warn("%s: tried to reset card\n", mmc_hostname(host));
2476 EXPORT_SYMBOL(mmc_hw_reset);
2478 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2480 host->f_init = freq;
2482 #ifdef CONFIG_MMC_DEBUG
2483 pr_info("%s: %s: trying to init card at %u Hz\n",
2484 mmc_hostname(host), __func__, host->f_init);
2486 mmc_power_up(host, host->ocr_avail);
2489 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2490 * do a hardware reset if possible.
2492 mmc_hw_reset_for_init(host);
2495 * sdio_reset sends CMD52 to reset card. Since we do not know
2496 * if the card is being re-initialized, just send it. CMD52
2497 * should be ignored by SD/eMMC cards.
2502 mmc_send_if_cond(host, host->ocr_avail);
2504 /* Order's important: probe SDIO, then SD, then MMC */
2505 if (!mmc_attach_sdio(host))
2507 if (!mmc_attach_sd(host))
2509 if (!mmc_attach_mmc(host))
2512 mmc_power_off(host);
2516 int _mmc_detect_card_removed(struct mmc_host *host)
2520 if (host->caps & MMC_CAP_NONREMOVABLE)
2523 if (!host->card || mmc_card_removed(host->card))
2526 ret = host->bus_ops->alive(host);
2529 * Card detect status and alive check may be out of sync if card is
2530 * removed slowly, when card detect switch changes while card/slot
2531 * pads are still contacted in hardware (refer to "SD Card Mechanical
2532 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2533 * detect work 200ms later for this case.
2535 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2536 mmc_detect_change(host, msecs_to_jiffies(200));
2537 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2541 mmc_card_set_removed(host->card);
2542 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2548 int mmc_detect_card_removed(struct mmc_host *host)
2550 struct mmc_card *card = host->card;
2553 WARN_ON(!host->claimed);
2558 ret = mmc_card_removed(card);
2560 * The card will be considered unchanged unless we have been asked to
2561 * detect a change or host requires polling to provide card detection.
2563 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2566 host->detect_change = 0;
2568 ret = _mmc_detect_card_removed(host);
2569 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2571 * Schedule a detect work as soon as possible to let a
2572 * rescan handle the card removal.
2574 cancel_delayed_work(&host->detect);
2575 _mmc_detect_change(host, 0, false);
2581 EXPORT_SYMBOL(mmc_detect_card_removed);
2583 void mmc_rescan(struct work_struct *work)
2585 struct mmc_host *host =
2586 container_of(work, struct mmc_host, detect.work);
2589 if (host->trigger_card_event && host->ops->card_event) {
2590 host->ops->card_event(host);
2591 host->trigger_card_event = false;
2594 if (host->rescan_disable)
2597 /* If there is a non-removable card registered, only scan once */
2598 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2600 host->rescan_entered = 1;
2605 * if there is a _removable_ card registered, check whether it is
2608 if (host->bus_ops && !host->bus_dead
2609 && !(host->caps & MMC_CAP_NONREMOVABLE))
2610 host->bus_ops->detect(host);
2612 host->detect_change = 0;
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");