2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/pm_wakeup.h>
27 #include <linux/suspend.h>
28 #include <linux/fault-inject.h>
29 #include <linux/random.h>
30 #include <linux/slab.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/mmc.h>
36 #include <linux/mmc/sd.h>
37 #include <linux/mmc/sdio.h>
48 /* If the device is not responding */
49 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
52 * Background operations can take a long time, depending on the housekeeping
53 * operations the card has to perform.
55 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
57 static struct workqueue_struct *workqueue;
58 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
61 * Enabling software CRCs on the data blocks can be a significant (30%)
62 * performance cost, and for other reasons may not always be desired.
63 * So we allow it it to be disabled.
66 module_param(use_spi_crc, bool, 0);
69 * We normally treat cards as removed during suspend if they are not
70 * known to be on a non-removable bus, to avoid the risk of writing
71 * back data to a different card after resume. Allow this to be
72 * overridden if necessary.
74 #ifdef CONFIG_MMC_UNSAFE_RESUME
75 bool mmc_assume_removable;
77 bool mmc_assume_removable = 1;
79 EXPORT_SYMBOL(mmc_assume_removable);
80 module_param_named(removable, mmc_assume_removable, bool, 0644);
83 "MMC/SD cards are removable and may be removed during suspend");
86 * Internal function. Schedule delayed work in the MMC work queue.
88 static int mmc_schedule_delayed_work(struct delayed_work *work,
91 return queue_delayed_work(workqueue, work, delay);
95 * Internal function. Flush all scheduled work from the MMC work queue.
97 static void mmc_flush_scheduled_work(void)
99 flush_workqueue(workqueue);
102 #ifdef CONFIG_FAIL_MMC_REQUEST
105 * Internal function. Inject random data errors.
106 * If mmc_data is NULL no errors are injected.
108 static void mmc_should_fail_request(struct mmc_host *host,
109 struct mmc_request *mrq)
111 struct mmc_command *cmd = mrq->cmd;
112 struct mmc_data *data = mrq->data;
113 static const int data_errors[] = {
122 if (cmd->error || data->error ||
123 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
126 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
127 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
130 #else /* CONFIG_FAIL_MMC_REQUEST */
132 static inline void mmc_should_fail_request(struct mmc_host *host,
133 struct mmc_request *mrq)
137 #endif /* CONFIG_FAIL_MMC_REQUEST */
140 * mmc_request_done - finish processing an MMC request
141 * @host: MMC host which completed request
142 * @mrq: MMC request which request
144 * MMC drivers should call this function when they have completed
145 * their processing of a request.
147 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
149 struct mmc_command *cmd = mrq->cmd;
150 int err = cmd->error;
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);
169 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
170 mmc_hostname(host), cmd->opcode, err,
171 cmd->resp[0], cmd->resp[1],
172 cmd->resp[2], cmd->resp[3]);
175 pr_debug("%s: %d bytes transferred: %d\n",
177 mrq->data->bytes_xfered, mrq->data->error);
181 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
182 mmc_hostname(host), mrq->stop->opcode,
184 mrq->stop->resp[0], mrq->stop->resp[1],
185 mrq->stop->resp[2], mrq->stop->resp[3]);
191 mmc_host_clk_release(host);
194 EXPORT_SYMBOL(mmc_request_done);
196 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
200 /* Assumes host controller has been runtime resumed by mmc_claim_host */
201 err = mmc_retune(host);
203 mrq->cmd->error = err;
204 mmc_request_done(host, mrq);
208 host->ops->request(host, mrq);
212 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
214 #ifdef CONFIG_MMC_DEBUG
216 struct scatterlist *sg;
218 mmc_retune_hold(host);
221 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
222 mmc_hostname(host), mrq->sbc->opcode,
223 mrq->sbc->arg, mrq->sbc->flags);
226 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
227 mmc_hostname(host), mrq->cmd->opcode,
228 mrq->cmd->arg, mrq->cmd->flags);
231 pr_debug("%s: blksz %d blocks %d flags %08x tsac %d ms nsac %d\n",
232 mmc_hostname(host), mrq->data->blksz,
233 mrq->data->blocks, mrq->data->flags,
234 mrq->data->timeout_ns / 1000000,
235 mrq->data->timeout_clks);
239 pr_debug("%s: CMD%u arg %08x flags %08x\n",
240 mmc_hostname(host), mrq->stop->opcode,
241 mrq->stop->arg, mrq->stop->flags);
244 WARN_ON(!host->claimed);
249 BUG_ON(mrq->data->blksz > host->max_blk_size);
250 BUG_ON(mrq->data->blocks > host->max_blk_count);
251 BUG_ON(mrq->data->blocks * mrq->data->blksz >
254 #ifdef CONFIG_MMC_DEBUG
256 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
258 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
261 mrq->cmd->data = mrq->data;
262 mrq->data->error = 0;
263 mrq->data->mrq = mrq;
265 mrq->data->stop = mrq->stop;
266 mrq->stop->error = 0;
267 mrq->stop->mrq = mrq;
270 mmc_host_clk_hold(host);
271 led_trigger_event(host->led, LED_FULL);
272 __mmc_start_request(host, mrq);
276 * mmc_start_bkops - start BKOPS for supported cards
277 * @card: MMC card to start BKOPS
278 * @form_exception: A flag to indicate if this function was
279 * called due to an exception raised by the card
281 * Start background operations whenever requested.
282 * When the urgent BKOPS bit is set in a R1 command response
283 * then background operations should be started immediately.
285 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
289 bool use_busy_signal;
293 if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))
296 err = mmc_read_bkops_status(card);
298 pr_err("%s: Failed to read bkops status: %d\n",
299 mmc_hostname(card->host), err);
303 if (!card->ext_csd.raw_bkops_status)
306 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
310 mmc_claim_host(card->host);
311 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
312 timeout = MMC_BKOPS_MAX_TIMEOUT;
313 use_busy_signal = true;
315 /* Hold re-tuning for ongoing bkops */
316 mmc_retune_hold(card->host);
318 use_busy_signal = false;
321 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
322 EXT_CSD_BKOPS_START, 1,
323 timeout, use_busy_signal, true);
325 pr_warn("%s: Error %d starting bkops\n",
326 mmc_hostname(card->host), err);
327 /* bkops not ongoing, so release re-tuning */
328 if (!use_busy_signal)
329 mmc_retune_release(card->host);
334 * For urgent bkops status (LEVEL_2 and more)
335 * bkops executed synchronously, otherwise
336 * the operation is in progress
338 if (!use_busy_signal)
339 mmc_card_set_doing_bkops(card);
341 mmc_release_host(card->host);
343 EXPORT_SYMBOL(mmc_start_bkops);
346 * mmc_wait_data_done() - done callback for data request
347 * @mrq: done data request
349 * Wakes up mmc context, passed as a callback to host controller driver
351 static void mmc_wait_data_done(struct mmc_request *mrq)
353 struct mmc_context_info *context_info = &mrq->host->context_info;
355 context_info->is_done_rcv = true;
356 wake_up_interruptible(&context_info->wait);
359 static void mmc_wait_done(struct mmc_request *mrq)
361 complete(&mrq->completion);
365 *__mmc_start_data_req() - starts data request
366 * @host: MMC host to start the request
367 * @mrq: data request to start
369 * Sets the done callback to be called when request is completed by the card.
370 * Starts data mmc request execution
372 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
374 mrq->done = mmc_wait_data_done;
376 if (mmc_card_removed(host->card)) {
377 mrq->cmd->error = -ENOMEDIUM;
378 mmc_wait_data_done(mrq);
381 mmc_start_request(host, mrq);
386 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
388 init_completion(&mrq->completion);
389 mrq->done = mmc_wait_done;
390 if (mmc_card_removed(host->card)) {
391 mrq->cmd->error = -ENOMEDIUM;
392 complete(&mrq->completion);
395 mmc_start_request(host, mrq);
399 static void mmc_get_req_timeout(struct mmc_request *mrq, u32 *timeout)
401 if (!mrq->cmd->data) {
402 if (mrq->cmd->opcode == MMC_ERASE ||
403 (mrq->cmd->opcode == MMC_ERASE_GROUP_START) ||
404 (mrq->cmd->opcode == MMC_ERASE_GROUP_END) ||
405 (mrq->cmd->opcode == MMC_SEND_STATUS))
410 *timeout = mrq->cmd->data->blocks *
411 mrq->cmd->data->blksz * 500;
412 *timeout = (*timeout) ? (*timeout) : 1000;
417 if ((mrq->cmd->opcode == SD_IO_RW_DIRECT) ||
418 (mrq->cmd->opcode == SD_IO_RW_EXTENDED))
420 else if ((mrq->cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200) ||
421 (mrq->cmd->opcode == MMC_SEND_TUNING_BLOCK))
427 * mmc_wait_for_data_req_done() - wait for request completed
428 * @host: MMC host to prepare the command.
429 * @mrq: MMC request to wait for
431 * Blocks MMC context till host controller will ack end of data request
432 * execution or new request notification arrives from the block layer.
433 * Handles command retries.
435 * Returns enum mmc_blk_status after checking errors.
437 static int mmc_wait_for_data_req_done(struct mmc_host *host,
438 struct mmc_request *mrq,
439 struct mmc_async_req *next_req)
441 struct mmc_command *cmd;
442 struct mmc_context_info *context_info = &host->context_info;
447 mmc_get_req_timeout(mrq, &timeout);
450 if (!wait_event_interruptible_timeout(context_info->wait,
451 (context_info->is_done_rcv ||
452 context_info->is_new_req),
453 msecs_to_jiffies(timeout))) {
455 cmd->error = -ETIMEDOUT;
456 host->ops->post_tmo(host);
457 context_info->is_done_rcv = true;
458 dev_err(mmc_dev(host),
459 "req failed (CMD%u): error = %d, timeout = %dms\n",
460 cmd->opcode, cmd->error, timeout);
463 spin_lock_irqsave(&context_info->lock, flags);
464 context_info->is_waiting_last_req = false;
465 spin_unlock_irqrestore(&context_info->lock, flags);
466 if (context_info->is_done_rcv) {
467 context_info->is_done_rcv = false;
468 context_info->is_new_req = false;
471 if (!cmd->error || !cmd->retries ||
472 mmc_card_removed(host->card)) {
473 err = host->areq->err_check(host->card,
475 break; /* return err */
477 mmc_retune_recheck(host);
478 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
480 cmd->opcode, cmd->error);
483 __mmc_start_request(host, mrq);
484 continue; /* wait for done/new event again */
486 } else if (context_info->is_new_req) {
487 context_info->is_new_req = false;
489 return MMC_BLK_NEW_REQUEST;
492 mmc_retune_release(host);
496 static void mmc_wait_for_req_done(struct mmc_host *host,
497 struct mmc_request *mrq)
499 struct mmc_command *cmd;
502 mmc_get_req_timeout(mrq, &timeout);
505 if (!wait_for_completion_timeout(&mrq->completion,
506 msecs_to_jiffies(timeout))) {
508 cmd->error = -ETIMEDOUT;
509 host->ops->post_tmo(host);
511 dev_err(mmc_dev(host),
512 "req failed (CMD%u): error = %d, timeout = %dms\n",
513 cmd->opcode, cmd->error, timeout);
521 * If host has timed out waiting for the sanitize
522 * to complete, card might be still in programming state
523 * so let's try to bring the card out of programming
526 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
527 if (!mmc_interrupt_hpi(host->card)) {
528 pr_warn("%s: %s: Interrupted sanitize\n",
529 mmc_hostname(host), __func__);
533 pr_err("%s: %s: Failed to interrupt sanitize\n",
534 mmc_hostname(host), __func__);
537 if (!cmd->error || !cmd->retries ||
538 mmc_card_removed(host->card))
541 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
542 mmc_hostname(host), cmd->opcode, cmd->error);
545 __mmc_start_request(host, mrq);
547 mmc_retune_release(host);
551 * mmc_pre_req - Prepare for a new request
552 * @host: MMC host to prepare command
553 * @mrq: MMC request to prepare for
554 * @is_first_req: true if there is no previous started request
555 * that may run in parellel to this call, otherwise false
557 * mmc_pre_req() is called in prior to mmc_start_req() to let
558 * host prepare for the new request. Preparation of a request may be
559 * performed while another request is running on the host.
561 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
564 if (host->ops->pre_req) {
565 mmc_host_clk_hold(host);
566 host->ops->pre_req(host, mrq, is_first_req);
567 mmc_host_clk_release(host);
572 * mmc_post_req - Post process a completed request
573 * @host: MMC host to post process command
574 * @mrq: MMC request to post process for
575 * @err: Error, if non zero, clean up any resources made in pre_req
577 * Let the host post process a completed request. Post processing of
578 * a request may be performed while another reuqest is running.
580 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
583 if (host->ops->post_req) {
584 mmc_host_clk_hold(host);
585 host->ops->post_req(host, mrq, err);
586 mmc_host_clk_release(host);
591 * mmc_start_req - start a non-blocking request
592 * @host: MMC host to start command
593 * @areq: async request to start
594 * @error: out parameter returns 0 for success, otherwise non zero
596 * Start a new MMC custom command request for a host.
597 * If there is on ongoing async request wait for completion
598 * of that request and start the new one and return.
599 * Does not wait for the new request to complete.
601 * Returns the completed request, NULL in case of none completed.
602 * Wait for the an ongoing request (previoulsy started) to complete and
603 * return the completed request. If there is no ongoing request, NULL
604 * is returned without waiting. NULL is not an error condition.
606 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
607 struct mmc_async_req *areq, int *error)
611 struct mmc_async_req *data = host->areq;
613 /* Prepare a new request */
615 mmc_pre_req(host, areq->mrq, !host->areq);
618 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
619 if (err == MMC_BLK_NEW_REQUEST) {
623 * The previous request was not completed,
629 * Check BKOPS urgency for each R1 response
631 if (host->card && mmc_card_mmc(host->card) &&
632 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
633 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
634 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
635 mmc_start_bkops(host->card, true);
639 start_err = __mmc_start_data_req(host, areq->mrq);
642 mmc_post_req(host, host->areq->mrq, 0);
644 /* Cancel a prepared request if it was not started. */
645 if ((err || start_err) && areq)
646 mmc_post_req(host, areq->mrq, -EINVAL);
657 EXPORT_SYMBOL(mmc_start_req);
660 * mmc_wait_for_req - start a request and wait for completion
661 * @host: MMC host to start command
662 * @mrq: MMC request to start
664 * Start a new MMC custom command request for a host, and wait
665 * for the command to complete. Does not attempt to parse the
668 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
670 __mmc_start_req(host, mrq);
671 mmc_wait_for_req_done(host, mrq);
673 EXPORT_SYMBOL(mmc_wait_for_req);
676 * mmc_interrupt_hpi - Issue for High priority Interrupt
677 * @card: the MMC card associated with the HPI transfer
679 * Issued High Priority Interrupt, and check for card status
680 * until out-of prg-state.
682 int mmc_interrupt_hpi(struct mmc_card *card)
686 unsigned long prg_wait;
690 if (!card->ext_csd.hpi_en) {
691 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
695 mmc_claim_host(card->host);
696 err = mmc_send_status(card, &status);
698 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
702 switch (R1_CURRENT_STATE(status)) {
708 * In idle and transfer states, HPI is not needed and the caller
709 * can issue the next intended command immediately
715 /* In all other states, it's illegal to issue HPI */
716 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
717 mmc_hostname(card->host), R1_CURRENT_STATE(status));
722 err = mmc_send_hpi_cmd(card, &status);
726 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
728 err = mmc_send_status(card, &status);
730 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
732 if (time_after(jiffies, prg_wait))
737 mmc_release_host(card->host);
740 EXPORT_SYMBOL(mmc_interrupt_hpi);
743 * mmc_wait_for_cmd - start a command and wait for completion
744 * @host: MMC host to start command
745 * @cmd: MMC command to start
746 * @retries: maximum number of retries
748 * Start a new MMC command for a host, and wait for the command
749 * to complete. Return any error that occurred while the command
750 * was executing. Do not attempt to parse the response.
752 int mmc_wait_for_cmd(struct mmc_host *host,
753 struct mmc_command *cmd,
756 struct mmc_request mrq = {NULL};
758 WARN_ON(!host->claimed);
760 memset(cmd->resp, 0, sizeof(cmd->resp));
761 cmd->retries = retries;
766 mmc_wait_for_req(host, &mrq);
770 EXPORT_SYMBOL(mmc_wait_for_cmd);
773 * mmc_stop_bkops - stop ongoing BKOPS
774 * @card: MMC card to check BKOPS
776 * Send HPI command to stop ongoing background operations to
777 * allow rapid servicing of foreground operations, e.g. read/
778 * writes. Wait until the card comes out of the programming state
779 * to avoid errors in servicing read/write requests.
781 int mmc_stop_bkops(struct mmc_card *card)
786 err = mmc_interrupt_hpi(card);
789 * If err is EINVAL, we can't issue an HPI.
790 * It should complete the BKOPS.
792 if (!err || (err == -EINVAL)) {
793 mmc_card_clr_doing_bkops(card);
794 mmc_retune_release(card->host);
800 EXPORT_SYMBOL(mmc_stop_bkops);
802 int mmc_read_bkops_status(struct mmc_card *card)
808 * In future work, we should consider storing the entire ext_csd.
810 ext_csd = kmalloc(512, GFP_KERNEL);
812 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
813 mmc_hostname(card->host));
817 mmc_claim_host(card->host);
818 err = mmc_send_ext_csd(card, ext_csd);
819 mmc_release_host(card->host);
823 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
824 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
829 EXPORT_SYMBOL(mmc_read_bkops_status);
832 * mmc_set_data_timeout - set the timeout for a data command
833 * @data: data phase for command
834 * @card: the MMC card associated with the data transfer
836 * Computes the data timeout parameters according to the
837 * correct algorithm given the card type.
839 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
844 * SDIO cards only define an upper 1 s limit on access.
846 if (mmc_card_sdio(card)) {
847 data->timeout_ns = 1000000000;
848 data->timeout_clks = 0;
853 * SD cards use a 100 multiplier rather than 10
855 mult = mmc_card_sd(card) ? 100 : 10;
858 * Scale up the multiplier (and therefore the timeout) by
859 * the r2w factor for writes.
861 if (data->flags & MMC_DATA_WRITE)
862 mult <<= card->csd.r2w_factor;
864 data->timeout_ns = card->csd.tacc_ns * mult;
865 data->timeout_clks = card->csd.tacc_clks * mult;
868 * SD cards also have an upper limit on the timeout.
870 if (mmc_card_sd(card)) {
871 unsigned int timeout_us, limit_us;
873 timeout_us = data->timeout_ns / 1000;
874 if (mmc_host_clk_rate(card->host))
875 timeout_us += data->timeout_clks * 1000 /
876 (mmc_host_clk_rate(card->host) / 1000);
878 if (data->flags & MMC_DATA_WRITE)
880 * The MMC spec "It is strongly recommended
881 * for hosts to implement more than 500ms
882 * timeout value even if the card indicates
883 * the 250ms maximum busy length." Even the
884 * previous value of 300ms is known to be
885 * insufficient for some cards.
892 * SDHC cards always use these fixed values.
894 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
895 data->timeout_ns = limit_us * 1000;
896 data->timeout_clks = 0;
901 * Some cards require longer data read timeout than indicated in CSD.
902 * Address this by setting the read timeout to a "reasonably high"
903 * value. For the cards tested, 300ms has proven enough. If necessary,
904 * this value can be increased if other problematic cards require this.
906 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
907 data->timeout_ns = 300000000;
908 data->timeout_clks = 0;
912 * Some cards need very high timeouts if driven in SPI mode.
913 * The worst observed timeout was 900ms after writing a
914 * continuous stream of data until the internal logic
917 if (mmc_host_is_spi(card->host)) {
918 if (data->flags & MMC_DATA_WRITE) {
919 if (data->timeout_ns < 1000000000)
920 data->timeout_ns = 1000000000; /* 1s */
922 if (data->timeout_ns < 100000000)
923 data->timeout_ns = 100000000; /* 100ms */
927 EXPORT_SYMBOL(mmc_set_data_timeout);
930 * mmc_align_data_size - pads a transfer size to a more optimal value
931 * @card: the MMC card associated with the data transfer
932 * @sz: original transfer size
934 * Pads the original data size with a number of extra bytes in
935 * order to avoid controller bugs and/or performance hits
936 * (e.g. some controllers revert to PIO for certain sizes).
938 * Returns the improved size, which might be unmodified.
940 * Note that this function is only relevant when issuing a
941 * single scatter gather entry.
943 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
946 * FIXME: We don't have a system for the controller to tell
947 * the core about its problems yet, so for now we just 32-bit
950 sz = ((sz + 3) / 4) * 4;
954 EXPORT_SYMBOL(mmc_align_data_size);
957 * __mmc_claim_host - exclusively claim a host
958 * @host: mmc host to claim
959 * @abort: whether or not the operation should be aborted
961 * Claim a host for a set of operations. If @abort is non null and
962 * dereference a non-zero value then this will return prematurely with
963 * that non-zero value without acquiring the lock. Returns zero
964 * with the lock held otherwise.
966 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
968 DECLARE_WAITQUEUE(wait, current);
974 add_wait_queue(&host->wq, &wait);
975 spin_lock_irqsave(&host->lock, flags);
977 set_current_state(TASK_UNINTERRUPTIBLE);
978 stop = abort ? atomic_read(abort) : 0;
979 if (stop || !host->claimed || host->claimer == current)
981 spin_unlock_irqrestore(&host->lock, flags);
983 spin_lock_irqsave(&host->lock, flags);
985 set_current_state(TASK_RUNNING);
988 host->claimer = current;
989 host->claim_cnt += 1;
994 spin_unlock_irqrestore(&host->lock, flags);
995 remove_wait_queue(&host->wq, &wait);
996 if (host->ops->enable && !stop && host->claim_cnt == 1)
997 host->ops->enable(host);
1000 EXPORT_SYMBOL(__mmc_claim_host);
1003 * mmc_release_host - release a host
1004 * @host: mmc host to release
1006 * Release a MMC host, allowing others to claim the host
1007 * for their operations.
1009 void mmc_release_host(struct mmc_host *host)
1011 unsigned long flags;
1013 WARN_ON(!host->claimed);
1015 if (host->ops->disable && host->claim_cnt == 1)
1016 host->ops->disable(host);
1018 spin_lock_irqsave(&host->lock, flags);
1019 if (--host->claim_cnt) {
1020 /* Release for nested claim */
1021 spin_unlock_irqrestore(&host->lock, flags);
1024 host->claimer = NULL;
1025 spin_unlock_irqrestore(&host->lock, flags);
1029 EXPORT_SYMBOL(mmc_release_host);
1032 * This is a helper function, which fetches a runtime pm reference for the
1033 * card device and also claims the host.
1035 void mmc_get_card(struct mmc_card *card)
1037 pm_runtime_get_sync(&card->dev);
1038 mmc_claim_host(card->host);
1040 EXPORT_SYMBOL(mmc_get_card);
1043 * This is a helper function, which releases the host and drops the runtime
1044 * pm reference for the card device.
1046 void mmc_put_card(struct mmc_card *card)
1048 mmc_release_host(card->host);
1049 pm_runtime_mark_last_busy(&card->dev);
1050 pm_runtime_put_autosuspend(&card->dev);
1052 EXPORT_SYMBOL(mmc_put_card);
1055 * Internal function that does the actual ios call to the host driver,
1056 * optionally printing some debug output.
1058 static inline void mmc_set_ios(struct mmc_host *host)
1060 struct mmc_ios *ios = &host->ios;
1062 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u timing %u\n",
1063 mmc_hostname(host), ios->clock, ios->bus_mode,
1064 ios->power_mode, ios->chip_select, ios->vdd,
1065 ios->bus_width, ios->timing);
1068 mmc_set_ungated(host);
1069 host->ops->set_ios(host, ios);
1073 * Control chip select pin on a host.
1075 void mmc_set_chip_select(struct mmc_host *host, int mode)
1077 mmc_host_clk_hold(host);
1078 host->ios.chip_select = mode;
1080 mmc_host_clk_release(host);
1084 * Sets the host clock to the highest possible frequency that
1087 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
1089 WARN_ON(hz < host->f_min);
1091 if (hz > host->f_max)
1094 host->ios.clock = hz;
1098 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1100 mmc_host_clk_hold(host);
1101 __mmc_set_clock(host, hz);
1102 mmc_host_clk_release(host);
1105 #ifdef CONFIG_MMC_CLKGATE
1107 * This gates the clock by setting it to 0 Hz.
1109 void mmc_gate_clock(struct mmc_host *host)
1111 unsigned long flags;
1113 spin_lock_irqsave(&host->clk_lock, flags);
1114 host->clk_old = host->ios.clock;
1115 host->ios.clock = 0;
1116 host->clk_gated = true;
1117 spin_unlock_irqrestore(&host->clk_lock, flags);
1122 * This restores the clock from gating by using the cached
1125 void mmc_ungate_clock(struct mmc_host *host)
1128 * We should previously have gated the clock, so the clock shall
1129 * be 0 here! The clock may however be 0 during initialization,
1130 * when some request operations are performed before setting
1131 * the frequency. When ungate is requested in that situation
1132 * we just ignore the call.
1134 if (host->clk_old) {
1135 BUG_ON(host->ios.clock);
1136 /* This call will also set host->clk_gated to false */
1137 __mmc_set_clock(host, host->clk_old);
1141 void mmc_set_ungated(struct mmc_host *host)
1143 unsigned long flags;
1146 * We've been given a new frequency while the clock is gated,
1147 * so make sure we regard this as ungating it.
1149 spin_lock_irqsave(&host->clk_lock, flags);
1150 host->clk_gated = false;
1151 spin_unlock_irqrestore(&host->clk_lock, flags);
1155 void mmc_set_ungated(struct mmc_host *host)
1160 int mmc_execute_tuning(struct mmc_card *card)
1162 struct mmc_host *host = card->host;
1166 if (!host->ops->execute_tuning)
1169 if (mmc_card_mmc(card))
1170 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1172 opcode = MMC_SEND_TUNING_BLOCK;
1174 mmc_host_clk_hold(host);
1175 err = host->ops->execute_tuning(host, opcode);
1176 mmc_host_clk_release(host);
1179 pr_err("%s: tuning execution failed\n", mmc_hostname(host));
1181 mmc_retune_enable(host);
1187 * Change the bus mode (open drain/push-pull) of a host.
1189 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1191 mmc_host_clk_hold(host);
1192 host->ios.bus_mode = mode;
1194 mmc_host_clk_release(host);
1198 * Change data bus width of a host.
1200 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1202 mmc_host_clk_hold(host);
1203 host->ios.bus_width = width;
1205 mmc_host_clk_release(host);
1209 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1210 * @vdd: voltage (mV)
1211 * @low_bits: prefer low bits in boundary cases
1213 * This function returns the OCR bit number according to the provided @vdd
1214 * value. If conversion is not possible a negative errno value returned.
1216 * Depending on the @low_bits flag the function prefers low or high OCR bits
1217 * on boundary voltages. For example,
1218 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1219 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1221 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1223 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1225 const int max_bit = ilog2(MMC_VDD_35_36);
1228 if (vdd < 1650 || vdd > 3600)
1231 if (vdd >= 1650 && vdd <= 1950)
1232 return ilog2(MMC_VDD_165_195);
1237 /* Base 2000 mV, step 100 mV, bit's base 8. */
1238 bit = (vdd - 2000) / 100 + 8;
1245 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1246 * @vdd_min: minimum voltage value (mV)
1247 * @vdd_max: maximum voltage value (mV)
1249 * This function returns the OCR mask bits according to the provided @vdd_min
1250 * and @vdd_max values. If conversion is not possible the function returns 0.
1252 * Notes wrt boundary cases:
1253 * This function sets the OCR bits for all boundary voltages, for example
1254 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1255 * MMC_VDD_34_35 mask.
1257 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1261 if (vdd_max < vdd_min)
1264 /* Prefer high bits for the boundary vdd_max values. */
1265 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1269 /* Prefer low bits for the boundary vdd_min values. */
1270 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1274 /* Fill the mask, from max bit to min bit. */
1275 while (vdd_max >= vdd_min)
1276 mask |= 1 << vdd_max--;
1280 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1285 * mmc_of_parse_voltage - return mask of supported voltages
1286 * @np: The device node need to be parsed.
1287 * @mask: mask of voltages available for MMC/SD/SDIO
1289 * 1. Return zero on success.
1290 * 2. Return negative errno: voltage-range is invalid.
1292 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1294 const u32 *voltage_ranges;
1297 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1298 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1299 if (!voltage_ranges || !num_ranges) {
1300 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1304 for (i = 0; i < num_ranges; i++) {
1305 const int j = i * 2;
1308 ocr_mask = mmc_vddrange_to_ocrmask(
1309 be32_to_cpu(voltage_ranges[j]),
1310 be32_to_cpu(voltage_ranges[j + 1]));
1312 pr_err("%s: voltage-range #%d is invalid\n",
1321 EXPORT_SYMBOL(mmc_of_parse_voltage);
1323 #endif /* CONFIG_OF */
1325 #ifdef CONFIG_REGULATOR
1328 * mmc_regulator_get_ocrmask - return mask of supported voltages
1329 * @supply: regulator to use
1331 * This returns either a negative errno, or a mask of voltages that
1332 * can be provided to MMC/SD/SDIO devices using the specified voltage
1333 * regulator. This would normally be called before registering the
1336 int mmc_regulator_get_ocrmask(struct regulator *supply)
1342 count = regulator_count_voltages(supply);
1346 for (i = 0; i < count; i++) {
1350 vdd_uV = regulator_list_voltage(supply, i);
1354 vdd_mV = vdd_uV / 1000;
1355 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1360 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1363 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1364 * @mmc: the host to regulate
1365 * @supply: regulator to use
1366 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1368 * Returns zero on success, else negative errno.
1370 * MMC host drivers may use this to enable or disable a regulator using
1371 * a particular supply voltage. This would normally be called from the
1374 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1375 struct regulator *supply,
1376 unsigned short vdd_bit)
1386 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1387 * bits this regulator doesn't quite support ... don't
1388 * be too picky, most cards and regulators are OK with
1389 * a 0.1V range goof (it's a small error percentage).
1391 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1393 min_uV = 1650 * 1000;
1394 max_uV = 1950 * 1000;
1396 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1397 max_uV = min_uV + 100 * 1000;
1401 * If we're using a fixed/static regulator, don't call
1402 * regulator_set_voltage; it would fail.
1404 voltage = regulator_get_voltage(supply);
1406 if (!regulator_can_change_voltage(supply)) {
1413 else if (voltage < min_uV || voltage > max_uV)
1414 result = regulator_set_voltage(supply, min_uV, max_uV);
1418 if (result == 0 && !mmc->regulator_enabled) {
1419 result = regulator_enable(supply);
1421 mmc->regulator_enabled = true;
1423 } else if (mmc->regulator_enabled) {
1424 result = regulator_disable(supply);
1426 mmc->regulator_enabled = false;
1430 dev_err(mmc_dev(mmc),
1431 "could not set regulator OCR (%d)\n", result);
1434 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1436 int mmc_regulator_get_supply(struct mmc_host *mmc)
1438 struct device *dev = mmc_dev(mmc);
1439 struct regulator *supply;
1442 supply = devm_regulator_get(dev, "vmmc");
1443 mmc->supply.vmmc = supply;
1444 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1447 return PTR_ERR(supply);
1449 ret = mmc_regulator_get_ocrmask(supply);
1451 mmc->ocr_avail = ret;
1453 dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
1457 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1459 #endif /* CONFIG_REGULATOR */
1462 * Mask off any voltages we don't support and select
1463 * the lowest voltage
1465 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1470 * Sanity check the voltages that the card claims to
1474 dev_warn(mmc_dev(host),
1475 "card claims to support voltages below defined range\n");
1479 ocr &= host->ocr_avail;
1481 dev_warn(mmc_dev(host), "no support for card's volts\n");
1485 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1488 mmc_power_cycle(host, ocr);
1492 if (bit != host->ios.vdd)
1493 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1499 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1502 int old_signal_voltage = host->ios.signal_voltage;
1504 host->ios.signal_voltage = signal_voltage;
1505 if (host->ops->start_signal_voltage_switch) {
1506 mmc_host_clk_hold(host);
1507 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1508 mmc_host_clk_release(host);
1512 host->ios.signal_voltage = old_signal_voltage;
1517 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1519 struct mmc_command cmd = {0};
1526 * Send CMD11 only if the request is to switch the card to
1529 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1530 return __mmc_set_signal_voltage(host, signal_voltage);
1533 * If we cannot switch voltages, return failure so the caller
1534 * can continue without UHS mode
1536 if (!host->ops->start_signal_voltage_switch)
1538 if (!host->ops->card_busy)
1539 pr_warn("%s: cannot verify signal voltage switch\n",
1540 mmc_hostname(host));
1542 cmd.opcode = SD_SWITCH_VOLTAGE;
1544 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1546 err = mmc_wait_for_cmd(host, &cmd, 0);
1550 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1553 mmc_host_clk_hold(host);
1555 * The card should drive cmd and dat[0:3] low immediately
1556 * after the response of cmd11, but wait 1 ms to be sure
1559 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1564 * During a signal voltage level switch, the clock must be gated
1565 * for 5 ms according to the SD spec
1567 clock = host->ios.clock;
1568 host->ios.clock = 0;
1571 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1573 * Voltages may not have been switched, but we've already
1574 * sent CMD11, so a power cycle is required anyway
1580 /* Keep clock gated for at least 5 ms */
1582 host->ios.clock = clock;
1585 /* Wait for at least 1 ms according to spec */
1589 * Failure to switch is indicated by the card holding
1592 if (host->ops->card_busy && host->ops->card_busy(host))
1597 pr_debug("%s: Signal voltage switch failed, power cycling card\n",
1598 mmc_hostname(host));
1599 mmc_power_cycle(host, ocr);
1602 mmc_host_clk_release(host);
1608 * Select timing parameters for host.
1610 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1612 mmc_host_clk_hold(host);
1613 host->ios.timing = timing;
1615 mmc_host_clk_release(host);
1619 * Select appropriate driver type for host.
1621 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1623 mmc_host_clk_hold(host);
1624 host->ios.drv_type = drv_type;
1626 mmc_host_clk_release(host);
1630 * Apply power to the MMC stack. This is a two-stage process.
1631 * First, we enable power to the card without the clock running.
1632 * We then wait a bit for the power to stabilise. Finally,
1633 * enable the bus drivers and clock to the card.
1635 * We must _NOT_ enable the clock prior to power stablising.
1637 * If a host does all the power sequencing itself, ignore the
1638 * initial MMC_POWER_UP stage.
1640 void mmc_power_up(struct mmc_host *host, u32 ocr)
1642 if (host->ios.power_mode == MMC_POWER_ON)
1645 mmc_host_clk_hold(host);
1646 mmc_retune_disable(host);
1648 host->ios.vdd = fls(ocr) - 1;
1649 if (mmc_host_is_spi(host))
1650 host->ios.chip_select = MMC_CS_HIGH;
1652 host->ios.chip_select = MMC_CS_DONTCARE;
1653 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1654 host->ios.power_mode = MMC_POWER_UP;
1655 host->ios.bus_width = MMC_BUS_WIDTH_1;
1656 host->ios.timing = MMC_TIMING_LEGACY;
1659 /* Set signal voltage to 3.3V */
1660 __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1663 * This delay should be sufficient to allow the power supply
1664 * to reach the minimum voltage.
1668 host->ios.clock = host->f_init;
1670 host->ios.power_mode = MMC_POWER_ON;
1674 * This delay must be at least 74 clock sizes, or 1 ms, or the
1675 * time required to reach a stable voltage.
1679 mmc_host_clk_release(host);
1682 void mmc_power_off(struct mmc_host *host)
1684 if (host->ios.power_mode == MMC_POWER_OFF)
1687 mmc_host_clk_hold(host);
1688 mmc_retune_disable(host);
1690 host->ios.clock = 0;
1693 if (!mmc_host_is_spi(host)) {
1694 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1695 host->ios.chip_select = MMC_CS_DONTCARE;
1697 host->ios.power_mode = MMC_POWER_OFF;
1698 host->ios.bus_width = MMC_BUS_WIDTH_1;
1699 host->ios.timing = MMC_TIMING_LEGACY;
1703 * Some configurations, such as the 802.11 SDIO card in the OLPC
1704 * XO-1.5, require a short delay after poweroff before the card
1705 * can be successfully turned on again.
1709 mmc_host_clk_release(host);
1712 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1714 mmc_power_off(host);
1715 /* Wait at least 1 ms according to SD spec */
1717 mmc_power_up(host, ocr);
1721 * Cleanup when the last reference to the bus operator is dropped.
1723 static void __mmc_release_bus(struct mmc_host *host)
1726 BUG_ON(host->bus_refs);
1727 BUG_ON(!host->bus_dead);
1729 host->bus_ops = NULL;
1733 * Increase reference count of bus operator
1735 static inline void mmc_bus_get(struct mmc_host *host)
1737 unsigned long flags;
1739 spin_lock_irqsave(&host->lock, flags);
1741 spin_unlock_irqrestore(&host->lock, flags);
1745 * Decrease reference count of bus operator and free it if
1746 * it is the last reference.
1748 static inline void mmc_bus_put(struct mmc_host *host)
1750 unsigned long flags;
1752 spin_lock_irqsave(&host->lock, flags);
1754 if ((host->bus_refs == 0) && host->bus_ops)
1755 __mmc_release_bus(host);
1756 spin_unlock_irqrestore(&host->lock, flags);
1760 int mmc_resume_bus(struct mmc_host *host)
1762 unsigned long flags;
1764 if (!mmc_bus_needs_resume(host))
1767 printk("%s: Starting deferred resume\n", mmc_hostname(host));
1768 spin_lock_irqsave(&host->lock, flags);
1769 host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME;
1770 host->rescan_disable = 0;
1771 spin_unlock_irqrestore(&host->lock, flags);
1774 if (host->bus_ops && !host->bus_dead) {
1776 BUG_ON(!host->bus_ops->resume);
1777 host->bus_ops->resume(host);
1780 if (host->bus_ops->detect && !host->bus_dead)
1781 host->bus_ops->detect(host);
1784 printk("%s: Deferred resume completed\n", mmc_hostname(host));
1788 EXPORT_SYMBOL(mmc_resume_bus);
1792 * Assign a mmc bus handler to a host. Only one bus handler may control a
1793 * host at any given time.
1795 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1797 unsigned long flags;
1802 WARN_ON(!host->claimed);
1804 spin_lock_irqsave(&host->lock, flags);
1806 BUG_ON(host->bus_ops);
1807 BUG_ON(host->bus_refs);
1809 host->bus_ops = ops;
1813 spin_unlock_irqrestore(&host->lock, flags);
1817 * Remove the current bus handler from a host.
1819 void mmc_detach_bus(struct mmc_host *host)
1821 unsigned long flags;
1825 WARN_ON(!host->claimed);
1826 WARN_ON(!host->bus_ops);
1828 spin_lock_irqsave(&host->lock, flags);
1832 spin_unlock_irqrestore(&host->lock, flags);
1837 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1840 #ifdef CONFIG_MMC_DEBUG
1841 unsigned long flags;
1843 spin_lock_irqsave(&host->lock, flags);
1844 WARN_ON(host->removed);
1845 spin_unlock_irqrestore(&host->lock, flags);
1849 * If the device is configured as wakeup, we prevent a new sleep for
1850 * 5 s to give provision for user space to consume the event.
1852 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1853 device_can_wakeup(mmc_dev(host)))
1854 pm_wakeup_event(mmc_dev(host), 5000);
1856 host->detect_change = 1;
1857 mmc_schedule_delayed_work(&host->detect, delay);
1861 * mmc_detect_change - process change of state on a MMC socket
1862 * @host: host which changed state.
1863 * @delay: optional delay to wait before detection (jiffies)
1865 * MMC drivers should call this when they detect a card has been
1866 * inserted or removed. The MMC layer will confirm that any
1867 * present card is still functional, and initialize any newly
1870 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1872 _mmc_detect_change(host, delay, true);
1874 EXPORT_SYMBOL(mmc_detect_change);
1876 void mmc_init_erase(struct mmc_card *card)
1880 if (is_power_of_2(card->erase_size))
1881 card->erase_shift = ffs(card->erase_size) - 1;
1883 card->erase_shift = 0;
1886 * It is possible to erase an arbitrarily large area of an SD or MMC
1887 * card. That is not desirable because it can take a long time
1888 * (minutes) potentially delaying more important I/O, and also the
1889 * timeout calculations become increasingly hugely over-estimated.
1890 * Consequently, 'pref_erase' is defined as a guide to limit erases
1891 * to that size and alignment.
1893 * For SD cards that define Allocation Unit size, limit erases to one
1894 * Allocation Unit at a time. For MMC cards that define High Capacity
1895 * Erase Size, whether it is switched on or not, limit to that size.
1896 * Otherwise just have a stab at a good value. For modern cards it
1897 * will end up being 4MiB. Note that if the value is too small, it
1898 * can end up taking longer to erase.
1900 if (mmc_card_sd(card) && card->ssr.au) {
1901 card->pref_erase = card->ssr.au;
1902 card->erase_shift = ffs(card->ssr.au) - 1;
1903 } else if (card->ext_csd.hc_erase_size) {
1904 card->pref_erase = card->ext_csd.hc_erase_size;
1906 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1908 card->pref_erase = 512 * 1024 / 512;
1910 card->pref_erase = 1024 * 1024 / 512;
1912 card->pref_erase = 2 * 1024 * 1024 / 512;
1914 card->pref_erase = 4 * 1024 * 1024 / 512;
1915 if (card->pref_erase < card->erase_size) {
1916 card->pref_erase = card->erase_size;
1918 sz = card->pref_erase % card->erase_size;
1920 card->pref_erase += card->erase_size - sz;
1925 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1926 unsigned int arg, unsigned int qty)
1928 unsigned int erase_timeout;
1930 if (arg == MMC_DISCARD_ARG ||
1931 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1932 erase_timeout = card->ext_csd.trim_timeout;
1933 } else if (card->ext_csd.erase_group_def & 1) {
1934 /* High Capacity Erase Group Size uses HC timeouts */
1935 if (arg == MMC_TRIM_ARG)
1936 erase_timeout = card->ext_csd.trim_timeout;
1938 erase_timeout = card->ext_csd.hc_erase_timeout;
1940 /* CSD Erase Group Size uses write timeout */
1941 unsigned int mult = (10 << card->csd.r2w_factor);
1942 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1943 unsigned int timeout_us;
1945 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1946 if (card->csd.tacc_ns < 1000000)
1947 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1949 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1952 * ios.clock is only a target. The real clock rate might be
1953 * less but not that much less, so fudge it by multiplying by 2.
1956 timeout_us += (timeout_clks * 1000) /
1957 (mmc_host_clk_rate(card->host) / 1000);
1959 erase_timeout = timeout_us / 1000;
1962 * Theoretically, the calculation could underflow so round up
1963 * to 1ms in that case.
1969 /* Multiplier for secure operations */
1970 if (arg & MMC_SECURE_ARGS) {
1971 if (arg == MMC_SECURE_ERASE_ARG)
1972 erase_timeout *= card->ext_csd.sec_erase_mult;
1974 erase_timeout *= card->ext_csd.sec_trim_mult;
1977 erase_timeout *= qty;
1980 * Ensure at least a 1 second timeout for SPI as per
1981 * 'mmc_set_data_timeout()'
1983 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1984 erase_timeout = 1000;
1986 return erase_timeout;
1989 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1993 unsigned int erase_timeout;
1995 if (card->ssr.erase_timeout) {
1996 /* Erase timeout specified in SD Status Register (SSR) */
1997 erase_timeout = card->ssr.erase_timeout * qty +
1998 card->ssr.erase_offset;
2001 * Erase timeout not specified in SD Status Register (SSR) so
2002 * use 250ms per write block.
2004 erase_timeout = 250 * qty;
2007 /* Must not be less than 1 second */
2008 if (erase_timeout < 1000)
2009 erase_timeout = 1000;
2011 return erase_timeout;
2014 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2018 if (mmc_card_sd(card))
2019 return mmc_sd_erase_timeout(card, arg, qty);
2021 return mmc_mmc_erase_timeout(card, arg, qty);
2024 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2025 unsigned int to, unsigned int arg)
2027 struct mmc_command cmd = {0};
2028 unsigned int qty = 0;
2029 unsigned long timeout;
2030 unsigned int fr, nr;
2033 mmc_retune_hold(card->host);
2039 * qty is used to calculate the erase timeout which depends on how many
2040 * erase groups (or allocation units in SD terminology) are affected.
2041 * We count erasing part of an erase group as one erase group.
2042 * For SD, the allocation units are always a power of 2. For MMC, the
2043 * erase group size is almost certainly also power of 2, but it does not
2044 * seem to insist on that in the JEDEC standard, so we fall back to
2045 * division in that case. SD may not specify an allocation unit size,
2046 * in which case the timeout is based on the number of write blocks.
2048 * Note that the timeout for secure trim 2 will only be correct if the
2049 * number of erase groups specified is the same as the total of all
2050 * preceding secure trim 1 commands. Since the power may have been
2051 * lost since the secure trim 1 commands occurred, it is generally
2052 * impossible to calculate the secure trim 2 timeout correctly.
2054 if (card->erase_shift)
2055 qty += ((to >> card->erase_shift) -
2056 (from >> card->erase_shift)) + 1;
2057 else if (mmc_card_sd(card))
2058 qty += to - from + 1;
2060 qty += ((to / card->erase_size) -
2061 (from / card->erase_size)) + 1;
2063 if (!mmc_card_blockaddr(card)) {
2068 if (mmc_card_sd(card))
2069 cmd.opcode = SD_ERASE_WR_BLK_START;
2071 cmd.opcode = MMC_ERASE_GROUP_START;
2073 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2074 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2076 pr_err("mmc_erase: group start error %d, status %#x\n",
2082 memset(&cmd, 0, sizeof(struct mmc_command));
2083 if (mmc_card_sd(card))
2084 cmd.opcode = SD_ERASE_WR_BLK_END;
2086 cmd.opcode = MMC_ERASE_GROUP_END;
2088 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2089 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2091 pr_err("mmc_erase: group end error %d, status %#x\n",
2097 memset(&cmd, 0, sizeof(struct mmc_command));
2098 cmd.opcode = MMC_ERASE;
2100 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2101 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
2102 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2104 pr_err("mmc_erase: erase error %d, status %#x\n",
2110 if (mmc_host_is_spi(card->host))
2113 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2115 memset(&cmd, 0, sizeof(struct mmc_command));
2116 cmd.opcode = MMC_SEND_STATUS;
2117 cmd.arg = card->rca << 16;
2118 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2119 /* Do not retry else we can't see errors */
2120 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2121 if (err || (cmd.resp[0] & 0xFDF92000)) {
2122 pr_err("error %d requesting status %#x\n",
2128 /* Timeout if the device never becomes ready for data and
2129 * never leaves the program state.
2131 if (time_after(jiffies, timeout)) {
2132 pr_err("%s: Card stuck in programming state! %s\n",
2133 mmc_hostname(card->host), __func__);
2138 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2139 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2141 mmc_retune_release(card->host);
2146 * mmc_erase - erase sectors.
2147 * @card: card to erase
2148 * @from: first sector to erase
2149 * @nr: number of sectors to erase
2150 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2152 * Caller must claim host before calling this function.
2154 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2157 unsigned int rem, to = from + nr;
2159 if (!(card->host->caps & MMC_CAP_ERASE) ||
2160 !(card->csd.cmdclass & CCC_ERASE))
2163 if (!card->erase_size)
2166 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2169 if ((arg & MMC_SECURE_ARGS) &&
2170 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2173 if ((arg & MMC_TRIM_ARGS) &&
2174 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2177 if (arg == MMC_SECURE_ERASE_ARG) {
2178 if (from % card->erase_size || nr % card->erase_size)
2182 if (arg == MMC_ERASE_ARG) {
2183 rem = from % card->erase_size;
2185 rem = card->erase_size - rem;
2192 rem = nr % card->erase_size;
2205 /* 'from' and 'to' are inclusive */
2208 return mmc_do_erase(card, from, to, arg);
2210 EXPORT_SYMBOL(mmc_erase);
2212 int mmc_can_erase(struct mmc_card *card)
2214 if ((card->host->caps & MMC_CAP_ERASE) &&
2215 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2219 EXPORT_SYMBOL(mmc_can_erase);
2221 int mmc_can_trim(struct mmc_card *card)
2223 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2224 !(card->quirks & MMC_QUIRK_TRIM_UNSTABLE))
2228 EXPORT_SYMBOL(mmc_can_trim);
2230 int mmc_can_discard(struct mmc_card *card)
2233 * As there's no way to detect the discard support bit at v4.5
2234 * use the s/w feature support filed.
2236 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2240 EXPORT_SYMBOL(mmc_can_discard);
2242 int mmc_can_sanitize(struct mmc_card *card)
2244 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2246 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2250 EXPORT_SYMBOL(mmc_can_sanitize);
2252 int mmc_can_secure_erase_trim(struct mmc_card *card)
2254 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
2258 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2260 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2263 if (!card->erase_size)
2265 if (from % card->erase_size || nr % card->erase_size)
2269 EXPORT_SYMBOL(mmc_erase_group_aligned);
2271 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2274 struct mmc_host *host = card->host;
2275 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2276 unsigned int last_timeout = 0;
2278 if (card->erase_shift)
2279 max_qty = UINT_MAX >> card->erase_shift;
2280 else if (mmc_card_sd(card))
2283 max_qty = UINT_MAX / card->erase_size;
2285 /* Find the largest qty with an OK timeout */
2288 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2289 timeout = mmc_erase_timeout(card, arg, qty + x);
2290 if (timeout > host->max_discard_to)
2292 if (timeout < last_timeout)
2294 last_timeout = timeout;
2306 /* Convert qty to sectors */
2307 if (card->erase_shift)
2308 max_discard = --qty << card->erase_shift;
2309 else if (mmc_card_sd(card))
2312 max_discard = --qty * card->erase_size;
2317 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2319 struct mmc_host *host = card->host;
2320 unsigned int max_discard, max_trim;
2322 if (!host->max_discard_to)
2326 * Without erase_group_def set, MMC erase timeout depends on clock
2327 * frequence which can change. In that case, the best choice is
2328 * just the preferred erase size.
2330 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2331 return card->pref_erase;
2333 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2334 if (mmc_can_trim(card)) {
2335 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2336 if (max_trim < max_discard)
2337 max_discard = max_trim;
2338 } else if (max_discard < card->erase_size) {
2341 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2342 mmc_hostname(host), max_discard, host->max_discard_to);
2345 EXPORT_SYMBOL(mmc_calc_max_discard);
2347 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2349 struct mmc_command cmd = {0};
2351 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
2354 cmd.opcode = MMC_SET_BLOCKLEN;
2356 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2357 return mmc_wait_for_cmd(card->host, &cmd, 5);
2359 EXPORT_SYMBOL(mmc_set_blocklen);
2361 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2364 struct mmc_command cmd = {0};
2366 cmd.opcode = MMC_SET_BLOCK_COUNT;
2367 cmd.arg = blockcount & 0x0000FFFF;
2370 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2371 return mmc_wait_for_cmd(card->host, &cmd, 5);
2373 EXPORT_SYMBOL(mmc_set_blockcount);
2375 static void mmc_hw_reset_for_init(struct mmc_host *host)
2377 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2379 mmc_host_clk_hold(host);
2380 host->ops->hw_reset(host);
2381 mmc_host_clk_release(host);
2384 int mmc_can_reset(struct mmc_card *card)
2388 if (!mmc_card_mmc(card))
2390 rst_n_function = card->ext_csd.rst_n_function;
2391 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2395 EXPORT_SYMBOL(mmc_can_reset);
2397 static int mmc_do_hw_reset(struct mmc_host *host, int check)
2399 struct mmc_card *card = host->card;
2401 if (!host->bus_ops->power_restore)
2404 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2410 if (!mmc_can_reset(card))
2413 mmc_host_clk_hold(host);
2414 mmc_set_clock(host, host->f_init);
2416 host->ops->hw_reset(host);
2418 /* If the reset has happened, then a status command will fail */
2420 struct mmc_command cmd = {0};
2423 cmd.opcode = MMC_SEND_STATUS;
2424 if (!mmc_host_is_spi(card->host))
2425 cmd.arg = card->rca << 16;
2426 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
2427 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2429 mmc_host_clk_release(host);
2434 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
2435 if (mmc_host_is_spi(host)) {
2436 host->ios.chip_select = MMC_CS_HIGH;
2437 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
2439 host->ios.chip_select = MMC_CS_DONTCARE;
2440 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
2442 host->ios.bus_width = MMC_BUS_WIDTH_1;
2443 host->ios.timing = MMC_TIMING_LEGACY;
2446 mmc_host_clk_release(host);
2448 return host->bus_ops->power_restore(host);
2451 int mmc_hw_reset(struct mmc_host *host)
2453 return mmc_do_hw_reset(host, 0);
2455 EXPORT_SYMBOL(mmc_hw_reset);
2457 int mmc_hw_reset_check(struct mmc_host *host)
2459 return mmc_do_hw_reset(host, 1);
2461 EXPORT_SYMBOL(mmc_hw_reset_check);
2463 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2465 host->f_init = freq;
2467 #ifdef CONFIG_MMC_DEBUG
2468 pr_info("%s: %s: trying to init card at %u Hz\n",
2469 mmc_hostname(host), __func__, host->f_init);
2471 mmc_power_up(host, host->ocr_avail);
2474 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2475 * do a hardware reset if possible.
2477 mmc_hw_reset_for_init(host);
2480 * sdio_reset sends CMD52 to reset card. Since we do not know
2481 * if the card is being re-initialized, just send it. CMD52
2482 * should be ignored by SD/eMMC cards.
2484 #ifdef MMC_STANDARD_PROBE
2488 mmc_send_if_cond(host, host->ocr_avail);
2490 /* Order's important: probe SDIO, then SD, then MMC */
2491 if (!mmc_attach_sdio(host))
2493 if (!mmc_attach_sd(host))
2495 if (!mmc_attach_mmc(host))
2499 * Simplifying initialization process.
2501 if (host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
2506 if (host->restrict_caps &
2507 (RESTRICT_CARD_TYPE_SDIO | RESTRICT_CARD_TYPE_SD))
2508 mmc_send_if_cond(host, host->ocr_avail);
2510 /* Order's important: probe SDIO, then SD, then MMC */
2511 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) &&
2512 !mmc_attach_sdio(host))
2514 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SD) &&
2515 !mmc_attach_sd(host))
2517 if ((host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) &&
2518 !mmc_attach_mmc(host))
2522 mmc_power_off(host);
2526 int _mmc_detect_card_removed(struct mmc_host *host)
2530 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
2533 if (!host->card || mmc_card_removed(host->card))
2536 ret = host->bus_ops->alive(host);
2539 * Card detect status and alive check may be out of sync if card is
2540 * removed slowly, when card detect switch changes while card/slot
2541 * pads are still contacted in hardware (refer to "SD Card Mechanical
2542 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2543 * detect work 200ms later for this case.
2545 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2546 mmc_detect_change(host, msecs_to_jiffies(200));
2547 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2551 mmc_card_set_removed(host->card);
2552 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2558 int mmc_detect_card_removed(struct mmc_host *host)
2560 struct mmc_card *card = host->card;
2563 WARN_ON(!host->claimed);
2568 ret = mmc_card_removed(card);
2570 * The card will be considered unchanged unless we have been asked to
2571 * detect a change or host requires polling to provide card detection.
2573 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2576 host->detect_change = 0;
2578 ret = _mmc_detect_card_removed(host);
2579 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2581 * Schedule a detect work as soon as possible to let a
2582 * rescan handle the card removal.
2584 cancel_delayed_work(&host->detect);
2585 _mmc_detect_change(host, 0, false);
2591 EXPORT_SYMBOL(mmc_detect_card_removed);
2593 void mmc_rescan(struct work_struct *work)
2595 struct mmc_host *host =
2596 container_of(work, struct mmc_host, detect.work);
2598 bool extend_wakelock = false;
2600 if (host->rescan_disable)
2603 /* If there is a non-removable card registered, only scan once */
2604 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2606 host->rescan_entered = 1;
2611 * if there is a _removable_ card registered, check whether it is
2614 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead &&
2615 !(host->caps & MMC_CAP_NONREMOVABLE))
2616 host->bus_ops->detect(host);
2618 host->detect_change = 0;
2620 /* If the card was removed the bus will be marked
2621 * as dead - extend the wakelock so userspace
2624 extend_wakelock = 1;
2627 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2628 * the card is no longer present.
2633 /* if there still is a card present, stop here */
2634 if (host->bus_ops != NULL) {
2640 * Only we can add a new handler, so it's safe to
2641 * release the lock here.
2645 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2646 host->ops->get_cd(host) == 0) {
2647 mmc_claim_host(host);
2648 mmc_power_off(host);
2649 mmc_release_host(host);
2653 mmc_claim_host(host);
2654 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2655 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
2656 extend_wakelock = true;
2659 if (freqs[i] <= host->f_min)
2662 mmc_release_host(host);
2665 if (extend_wakelock)
2666 wake_lock_timeout(&host->detect_wake_lock, HZ / 2);
2668 wake_unlock(&host->detect_wake_lock);
2669 if (host->caps & MMC_CAP_NEEDS_POLL) {
2670 wake_lock(&host->detect_wake_lock);
2671 mmc_schedule_delayed_work(&host->detect, HZ);
2675 void mmc_start_host(struct mmc_host *host)
2677 host->f_init = max(freqs[0], host->f_min);
2678 host->rescan_disable = 0;
2679 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2680 mmc_power_off(host);
2682 mmc_power_up(host, host->ocr_avail);
2683 _mmc_detect_change(host, 0, false);
2686 void mmc_stop_host(struct mmc_host *host)
2688 #ifdef CONFIG_MMC_DEBUG
2689 unsigned long flags;
2691 spin_lock_irqsave(&host->lock, flags);
2693 spin_unlock_irqrestore(&host->lock, flags);
2696 host->rescan_disable = 1;
2697 if (cancel_delayed_work_sync(&host->detect))
2698 wake_unlock(&host->detect_wake_lock);
2699 mmc_flush_scheduled_work();
2701 /* clear pm flags now and let card drivers set them as needed */
2705 if (host->bus_ops && !host->bus_dead) {
2706 /* Calling bus_ops->remove() with a claimed host can deadlock */
2707 host->bus_ops->remove(host);
2708 mmc_claim_host(host);
2709 mmc_detach_bus(host);
2710 mmc_power_off(host);
2711 mmc_release_host(host);
2719 mmc_power_off(host);
2722 int mmc_power_save_host(struct mmc_host *host)
2726 #ifdef CONFIG_MMC_DEBUG
2727 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2732 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2737 if (host->bus_ops->power_save)
2738 ret = host->bus_ops->power_save(host);
2742 mmc_power_off(host);
2746 EXPORT_SYMBOL(mmc_power_save_host);
2748 int mmc_power_restore_host(struct mmc_host *host)
2752 #ifdef CONFIG_MMC_DEBUG
2753 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2758 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2763 mmc_power_up(host, host->card->ocr);
2764 ret = host->bus_ops->power_restore(host);
2770 EXPORT_SYMBOL(mmc_power_restore_host);
2773 * Flush the cache to the non-volatile storage.
2775 int mmc_flush_cache(struct mmc_card *card)
2777 struct mmc_host *host = card->host;
2780 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2783 if (mmc_card_mmc(card) &&
2784 (card->ext_csd.cache_size > 0) &&
2785 (card->ext_csd.cache_ctrl & 1)) {
2786 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2787 EXT_CSD_FLUSH_CACHE, 1, 0);
2789 pr_err("%s: cache flush error %d\n",
2790 mmc_hostname(card->host), err);
2795 EXPORT_SYMBOL(mmc_flush_cache);
2798 * Turn the cache ON/OFF.
2799 * Turning the cache OFF shall trigger flushing of the data
2800 * to the non-volatile storage.
2801 * This function should be called with host claimed
2803 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2805 struct mmc_card *card = host->card;
2806 unsigned int timeout;
2809 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2810 mmc_card_is_removable(host))
2813 if (card && mmc_card_mmc(card) &&
2814 (card->ext_csd.cache_size > 0)) {
2817 if (card->ext_csd.cache_ctrl ^ enable) {
2818 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2819 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2820 EXT_CSD_CACHE_CTRL, enable, timeout);
2822 pr_err("%s: cache %s error %d\n",
2823 mmc_hostname(card->host),
2824 enable ? "on" : "off",
2827 card->ext_csd.cache_ctrl = enable;
2833 EXPORT_SYMBOL(mmc_cache_ctrl);
2837 /* Do the card removal on suspend if card is assumed removeable
2838 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2841 int mmc_pm_notify(struct notifier_block *notify_block,
2842 unsigned long mode, void *unused)
2844 struct mmc_host *host = container_of(
2845 notify_block, struct mmc_host, pm_notify);
2846 unsigned long flags;
2850 case PM_HIBERNATION_PREPARE:
2851 case PM_SUSPEND_PREPARE:
2852 spin_lock_irqsave(&host->lock, flags);
2853 if (mmc_bus_needs_resume(host)) {
2854 spin_unlock_irqrestore(&host->lock, flags);
2857 host->rescan_disable = 1;
2858 spin_unlock_irqrestore(&host->lock, flags);
2859 if (cancel_delayed_work_sync(&host->detect))
2860 wake_unlock(&host->detect_wake_lock);
2865 /* Validate prerequisites for suspend */
2866 if (host->bus_ops->pre_suspend)
2867 err = host->bus_ops->pre_suspend(host);
2868 if (!err && host->bus_ops->suspend)
2871 /* Calling bus_ops->remove() with a claimed host can deadlock */
2872 host->bus_ops->remove(host);
2873 mmc_claim_host(host);
2874 mmc_detach_bus(host);
2875 mmc_power_off(host);
2876 mmc_release_host(host);
2880 case PM_POST_SUSPEND:
2881 case PM_POST_HIBERNATION:
2882 case PM_POST_RESTORE:
2884 spin_lock_irqsave(&host->lock, flags);
2885 if (mmc_bus_manual_resume(host)) {
2886 spin_unlock_irqrestore(&host->lock, flags);
2889 host->rescan_disable = 0;
2890 spin_unlock_irqrestore(&host->lock, flags);
2891 _mmc_detect_change(host, 0, false);
2899 * mmc_init_context_info() - init synchronization context
2902 * Init struct context_info needed to implement asynchronous
2903 * request mechanism, used by mmc core, host driver and mmc requests
2906 void mmc_init_context_info(struct mmc_host *host)
2908 spin_lock_init(&host->context_info.lock);
2909 host->context_info.is_new_req = false;
2910 host->context_info.is_done_rcv = false;
2911 host->context_info.is_waiting_last_req = false;
2912 init_waitqueue_head(&host->context_info.wait);
2915 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2916 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2917 struct sdio_cis *cis,
2918 struct sdio_cccr *cccr,
2919 struct sdio_embedded_func *funcs,
2922 host->embedded_sdio_data.cis = cis;
2923 host->embedded_sdio_data.cccr = cccr;
2924 host->embedded_sdio_data.funcs = funcs;
2925 host->embedded_sdio_data.num_funcs = num_funcs;
2927 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2930 static int __init mmc_init(void)
2934 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2938 ret = mmc_register_bus();
2940 goto destroy_workqueue;
2942 ret = mmc_register_host_class();
2944 goto unregister_bus;
2946 ret = sdio_register_bus();
2948 goto unregister_host_class;
2952 unregister_host_class:
2953 mmc_unregister_host_class();
2955 mmc_unregister_bus();
2957 destroy_workqueue(workqueue);
2962 static void __exit mmc_exit(void)
2964 sdio_unregister_bus();
2965 mmc_unregister_host_class();
2966 mmc_unregister_bus();
2967 destroy_workqueue(workqueue);
2970 subsys_initcall(mmc_init);
2971 module_exit(mmc_exit);
2973 MODULE_LICENSE("GPL");