2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/pm_wakeup.h>
27 #include <linux/suspend.h>
28 #include <linux/fault-inject.h>
29 #include <linux/random.h>
30 #include <linux/slab.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/mmc.h>
36 #include <linux/mmc/sd.h>
47 /* If the device is not responding */
48 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
51 * Background operations can take a long time, depending on the housekeeping
52 * operations the card has to perform.
54 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
56 static struct workqueue_struct *workqueue;
57 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
60 * Enabling software CRCs on the data blocks can be a significant (30%)
61 * performance cost, and for other reasons may not always be desired.
62 * So we allow it it to be disabled.
65 module_param(use_spi_crc, bool, 0);
68 * We normally treat cards as removed during suspend if they are not
69 * known to be on a non-removable bus, to avoid the risk of writing
70 * back data to a different card after resume. Allow this to be
71 * overridden if necessary.
73 #ifdef CONFIG_MMC_UNSAFE_RESUME
74 bool mmc_assume_removable;
76 bool mmc_assume_removable = 1;
78 EXPORT_SYMBOL(mmc_assume_removable);
79 module_param_named(removable, mmc_assume_removable, bool, 0644);
82 "MMC/SD cards are removable and may be removed during suspend");
85 * Internal function. Schedule delayed work in the MMC work queue.
87 static int mmc_schedule_delayed_work(struct delayed_work *work,
90 return queue_delayed_work(workqueue, work, delay);
94 * Internal function. Flush all scheduled work from the MMC work queue.
96 static void mmc_flush_scheduled_work(void)
98 flush_workqueue(workqueue);
101 #ifdef CONFIG_FAIL_MMC_REQUEST
104 * Internal function. Inject random data errors.
105 * If mmc_data is NULL no errors are injected.
107 static void mmc_should_fail_request(struct mmc_host *host,
108 struct mmc_request *mrq)
110 struct mmc_command *cmd = mrq->cmd;
111 struct mmc_data *data = mrq->data;
112 static const int data_errors[] = {
121 if (cmd->error || data->error ||
122 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
125 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
126 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
129 #else /* CONFIG_FAIL_MMC_REQUEST */
131 static inline void mmc_should_fail_request(struct mmc_host *host,
132 struct mmc_request *mrq)
136 #endif /* CONFIG_FAIL_MMC_REQUEST */
139 * mmc_request_done - finish processing an MMC request
140 * @host: MMC host which completed request
141 * @mrq: MMC request which request
143 * MMC drivers should call this function when they have completed
144 * their processing of a request.
146 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
148 struct mmc_command *cmd = mrq->cmd;
149 int err = cmd->error;
151 if (err && cmd->retries && mmc_host_is_spi(host)) {
152 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
156 if (err && cmd->retries && !mmc_card_removed(host->card)) {
158 * Request starter must handle retries - see
159 * mmc_wait_for_req_done().
164 mmc_should_fail_request(host, mrq);
166 led_trigger_event(host->led, LED_OFF);
168 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
169 mmc_hostname(host), cmd->opcode, err,
170 cmd->resp[0], cmd->resp[1],
171 cmd->resp[2], cmd->resp[3]);
174 pr_debug("%s: %d bytes transferred: %d\n",
176 mrq->data->bytes_xfered, mrq->data->error);
180 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
181 mmc_hostname(host), mrq->stop->opcode,
183 mrq->stop->resp[0], mrq->stop->resp[1],
184 mrq->stop->resp[2], mrq->stop->resp[3]);
190 mmc_host_clk_release(host);
194 EXPORT_SYMBOL(mmc_request_done);
197 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
199 #ifdef CONFIG_MMC_DEBUG
201 struct scatterlist *sg;
205 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
206 mmc_hostname(host), mrq->sbc->opcode,
207 mrq->sbc->arg, mrq->sbc->flags);
210 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
211 mmc_hostname(host), mrq->cmd->opcode,
212 mrq->cmd->arg, mrq->cmd->flags);
215 pr_debug("%s: blksz %d blocks %d flags %08x "
216 "tsac %d ms nsac %d\n",
217 mmc_hostname(host), mrq->data->blksz,
218 mrq->data->blocks, mrq->data->flags,
219 mrq->data->timeout_ns / 1000000,
220 mrq->data->timeout_clks);
224 pr_debug("%s: CMD%u arg %08x flags %08x\n",
225 mmc_hostname(host), mrq->stop->opcode,
226 mrq->stop->arg, mrq->stop->flags);
229 WARN_ON(!host->claimed);
234 BUG_ON(mrq->data->blksz > host->max_blk_size);
235 BUG_ON(mrq->data->blocks > host->max_blk_count);
236 BUG_ON(mrq->data->blocks * mrq->data->blksz >
239 #ifdef CONFIG_MMC_DEBUG
241 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
243 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
246 mrq->cmd->data = mrq->data;
247 mrq->data->error = 0;
248 mrq->data->mrq = mrq;
250 mrq->data->stop = mrq->stop;
251 mrq->stop->error = 0;
252 mrq->stop->mrq = mrq;
255 mmc_host_clk_hold(host);
256 led_trigger_event(host->led, LED_FULL);
257 host->ops->request(host, mrq);
261 * mmc_start_bkops - start BKOPS for supported cards
262 * @card: MMC card to start BKOPS
263 * @form_exception: A flag to indicate if this function was
264 * called due to an exception raised by the card
266 * Start background operations whenever requested.
267 * When the urgent BKOPS bit is set in a R1 command response
268 * then background operations should be started immediately.
270 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
274 bool use_busy_signal;
278 if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))
281 err = mmc_read_bkops_status(card);
283 pr_err("%s: Failed to read bkops status: %d\n",
284 mmc_hostname(card->host), err);
288 if (!card->ext_csd.raw_bkops_status)
291 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
295 mmc_claim_host(card->host);
296 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
297 timeout = MMC_BKOPS_MAX_TIMEOUT;
298 use_busy_signal = true;
301 use_busy_signal = false;
304 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
305 EXT_CSD_BKOPS_START, 1, timeout, use_busy_signal, true);
307 pr_warn("%s: Error %d starting bkops\n",
308 mmc_hostname(card->host), err);
313 * For urgent bkops status (LEVEL_2 and more)
314 * bkops executed synchronously, otherwise
315 * the operation is in progress
317 if (!use_busy_signal)
318 mmc_card_set_doing_bkops(card);
320 mmc_release_host(card->host);
322 EXPORT_SYMBOL(mmc_start_bkops);
325 * mmc_wait_data_done() - done callback for data request
326 * @mrq: done data request
328 * Wakes up mmc context, passed as a callback to host controller driver
330 static void mmc_wait_data_done(struct mmc_request *mrq)
332 struct mmc_context_info *context_info = &mrq->host->context_info;
334 context_info->is_done_rcv = true;
335 wake_up_interruptible(&context_info->wait);
338 static void mmc_wait_done(struct mmc_request *mrq)
340 complete(&mrq->completion);
344 *__mmc_start_data_req() - starts data request
345 * @host: MMC host to start the request
346 * @mrq: data request to start
348 * Sets the done callback to be called when request is completed by the card.
349 * Starts data mmc request execution
351 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
353 mrq->done = mmc_wait_data_done;
355 if (mmc_card_removed(host->card)) {
356 mrq->cmd->error = -ENOMEDIUM;
357 mmc_wait_data_done(mrq);
360 mmc_start_request(host, mrq);
365 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
367 init_completion(&mrq->completion);
368 mrq->done = mmc_wait_done;
369 if (mmc_card_removed(host->card)) {
370 mrq->cmd->error = -ENOMEDIUM;
371 complete(&mrq->completion);
374 mmc_start_request(host, mrq);
379 * mmc_wait_for_data_req_done() - wait for request completed
380 * @host: MMC host to prepare the command.
381 * @mrq: MMC request to wait for
383 * Blocks MMC context till host controller will ack end of data request
384 * execution or new request notification arrives from the block layer.
385 * Handles command retries.
387 * Returns enum mmc_blk_status after checking errors.
389 static int mmc_wait_for_data_req_done(struct mmc_host *host,
390 struct mmc_request *mrq,
391 struct mmc_async_req *next_req)
393 struct mmc_command *cmd;
394 struct mmc_context_info *context_info = &host->context_info;
399 wait_event_interruptible(context_info->wait,
400 (context_info->is_done_rcv ||
401 context_info->is_new_req));
402 spin_lock_irqsave(&context_info->lock, flags);
403 context_info->is_waiting_last_req = false;
404 spin_unlock_irqrestore(&context_info->lock, flags);
405 if (context_info->is_done_rcv) {
406 context_info->is_done_rcv = false;
407 context_info->is_new_req = false;
410 if (!cmd->error || !cmd->retries ||
411 mmc_card_removed(host->card)) {
412 err = host->areq->err_check(host->card,
414 break; /* return err */
416 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
418 cmd->opcode, cmd->error);
421 host->ops->request(host, mrq);
422 continue; /* wait for done/new event again */
424 } else if (context_info->is_new_req) {
425 context_info->is_new_req = false;
427 err = MMC_BLK_NEW_REQUEST;
428 break; /* return err */
435 static void mmc_wait_for_req_done(struct mmc_host *host,
436 struct mmc_request *mrq)
438 struct mmc_command *cmd;
441 if (!mrq->cmd->data) {
442 if (mrq->cmd->opcode == MMC_ERASE || (mrq->cmd->opcode == MMC_SEND_STATUS))
447 timeout = mrq->cmd->data->blocks * mrq->cmd->data->blksz * 500;
450 else if (timeout > 8 * 1000)
455 if (!wait_for_completion_timeout(&mrq->completion, msecs_to_jiffies(timeout))) {
457 cmd->error = -ETIMEDOUT;
458 host->ops->post_tmo(host);
459 dev_err(mmc_dev(host), "req failed (CMD%u): error = %d, timeout = %dms\n",
460 cmd->opcode, cmd->error, timeout);
468 * If host has timed out waiting for the sanitize
469 * to complete, card might be still in programming state
470 * so let's try to bring the card out of programming
473 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
474 if (!mmc_interrupt_hpi(host->card)) {
475 pr_warning("%s: %s: Interrupted sanitize\n",
476 mmc_hostname(host), __func__);
480 pr_err("%s: %s: Failed to interrupt sanitize\n",
481 mmc_hostname(host), __func__);
484 if (!cmd->error || !cmd->retries ||
485 mmc_card_removed(host->card))
488 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
489 mmc_hostname(host), cmd->opcode, cmd->error);
492 host->ops->request(host, mrq);
497 * mmc_pre_req - Prepare for a new request
498 * @host: MMC host to prepare command
499 * @mrq: MMC request to prepare for
500 * @is_first_req: true if there is no previous started request
501 * that may run in parellel to this call, otherwise false
503 * mmc_pre_req() is called in prior to mmc_start_req() to let
504 * host prepare for the new request. Preparation of a request may be
505 * performed while another request is running on the host.
507 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
510 if (host->ops->pre_req) {
511 mmc_host_clk_hold(host);
512 host->ops->pre_req(host, mrq, is_first_req);
513 mmc_host_clk_release(host);
518 * mmc_post_req - Post process a completed request
519 * @host: MMC host to post process command
520 * @mrq: MMC request to post process for
521 * @err: Error, if non zero, clean up any resources made in pre_req
523 * Let the host post process a completed request. Post processing of
524 * a request may be performed while another reuqest is running.
526 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
529 if (host->ops->post_req) {
530 mmc_host_clk_hold(host);
531 host->ops->post_req(host, mrq, err);
532 mmc_host_clk_release(host);
537 * mmc_start_req - start a non-blocking request
538 * @host: MMC host to start command
539 * @areq: async request to start
540 * @error: out parameter returns 0 for success, otherwise non zero
542 * Start a new MMC custom command request for a host.
543 * If there is on ongoing async request wait for completion
544 * of that request and start the new one and return.
545 * Does not wait for the new request to complete.
547 * Returns the completed request, NULL in case of none completed.
548 * Wait for the an ongoing request (previoulsy started) to complete and
549 * return the completed request. If there is no ongoing request, NULL
550 * is returned without waiting. NULL is not an error condition.
552 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
553 struct mmc_async_req *areq, int *error)
557 struct mmc_async_req *data = host->areq;
559 /* Prepare a new request */
561 mmc_pre_req(host, areq->mrq, !host->areq);
564 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
565 if (err == MMC_BLK_NEW_REQUEST) {
569 * The previous request was not completed,
575 * Check BKOPS urgency for each R1 response
577 if (host->card && mmc_card_mmc(host->card) &&
578 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
579 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
580 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
581 mmc_start_bkops(host->card, true);
585 start_err = __mmc_start_data_req(host, areq->mrq);
589 mmc_post_req(host, host->areq->mrq, 0);
591 /* Cancel a prepared request if it was not started. */
592 if ((err || start_err) && areq)
593 mmc_post_req(host, areq->mrq, -EINVAL);
604 EXPORT_SYMBOL(mmc_start_req);
607 * mmc_wait_for_req - start a request and wait for completion
608 * @host: MMC host to start command
609 * @mrq: MMC request to start
611 * Start a new MMC custom command request for a host, and wait
612 * for the command to complete. Does not attempt to parse the
615 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
617 __mmc_start_req(host, mrq);
618 mmc_wait_for_req_done(host, mrq);
620 EXPORT_SYMBOL(mmc_wait_for_req);
623 * mmc_interrupt_hpi - Issue for High priority Interrupt
624 * @card: the MMC card associated with the HPI transfer
626 * Issued High Priority Interrupt, and check for card status
627 * until out-of prg-state.
629 int mmc_interrupt_hpi(struct mmc_card *card)
633 unsigned long prg_wait;
637 if (!card->ext_csd.hpi_en) {
638 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
642 mmc_claim_host(card->host);
643 err = mmc_send_status(card, &status);
645 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
649 switch (R1_CURRENT_STATE(status)) {
655 * In idle and transfer states, HPI is not needed and the caller
656 * can issue the next intended command immediately
662 /* In all other states, it's illegal to issue HPI */
663 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
664 mmc_hostname(card->host), R1_CURRENT_STATE(status));
669 err = mmc_send_hpi_cmd(card, &status);
673 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
675 err = mmc_send_status(card, &status);
677 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
679 if (time_after(jiffies, prg_wait))
684 mmc_release_host(card->host);
687 EXPORT_SYMBOL(mmc_interrupt_hpi);
690 * mmc_wait_for_cmd - start a command and wait for completion
691 * @host: MMC host to start command
692 * @cmd: MMC command to start
693 * @retries: maximum number of retries
695 * Start a new MMC command for a host, and wait for the command
696 * to complete. Return any error that occurred while the command
697 * was executing. Do not attempt to parse the response.
699 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
701 struct mmc_request mrq = {NULL};
703 WARN_ON(!host->claimed);
705 memset(cmd->resp, 0, sizeof(cmd->resp));
706 cmd->retries = retries;
711 mmc_wait_for_req(host, &mrq);
716 EXPORT_SYMBOL(mmc_wait_for_cmd);
719 * mmc_stop_bkops - stop ongoing BKOPS
720 * @card: MMC card to check BKOPS
722 * Send HPI command to stop ongoing background operations to
723 * allow rapid servicing of foreground operations, e.g. read/
724 * writes. Wait until the card comes out of the programming state
725 * to avoid errors in servicing read/write requests.
727 int mmc_stop_bkops(struct mmc_card *card)
732 err = mmc_interrupt_hpi(card);
735 * If err is EINVAL, we can't issue an HPI.
736 * It should complete the BKOPS.
738 if (!err || (err == -EINVAL)) {
739 mmc_card_clr_doing_bkops(card);
745 EXPORT_SYMBOL(mmc_stop_bkops);
747 int mmc_read_bkops_status(struct mmc_card *card)
753 * In future work, we should consider storing the entire ext_csd.
755 ext_csd = kmalloc(512, GFP_KERNEL);
757 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
758 mmc_hostname(card->host));
762 mmc_claim_host(card->host);
763 err = mmc_send_ext_csd(card, ext_csd);
764 mmc_release_host(card->host);
768 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
769 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
774 EXPORT_SYMBOL(mmc_read_bkops_status);
777 * mmc_set_data_timeout - set the timeout for a data command
778 * @data: data phase for command
779 * @card: the MMC card associated with the data transfer
781 * Computes the data timeout parameters according to the
782 * correct algorithm given the card type.
784 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
789 * SDIO cards only define an upper 1 s limit on access.
791 if (mmc_card_sdio(card)) {
792 data->timeout_ns = 1000000000;
793 data->timeout_clks = 0;
798 * SD cards use a 100 multiplier rather than 10
800 mult = mmc_card_sd(card) ? 100 : 10;
803 * Scale up the multiplier (and therefore the timeout) by
804 * the r2w factor for writes.
806 if (data->flags & MMC_DATA_WRITE)
807 mult <<= card->csd.r2w_factor;
809 data->timeout_ns = card->csd.tacc_ns * mult;
810 data->timeout_clks = card->csd.tacc_clks * mult;
813 * SD cards also have an upper limit on the timeout.
815 if (mmc_card_sd(card)) {
816 unsigned int timeout_us, limit_us;
818 timeout_us = data->timeout_ns / 1000;
819 if (mmc_host_clk_rate(card->host))
820 timeout_us += data->timeout_clks * 1000 /
821 (mmc_host_clk_rate(card->host) / 1000);
823 if (data->flags & MMC_DATA_WRITE)
825 * The MMC spec "It is strongly recommended
826 * for hosts to implement more than 500ms
827 * timeout value even if the card indicates
828 * the 250ms maximum busy length." Even the
829 * previous value of 300ms is known to be
830 * insufficient for some cards.
837 * SDHC cards always use these fixed values.
839 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
840 data->timeout_ns = limit_us * 1000;
841 data->timeout_clks = 0;
846 * Some cards require longer data read timeout than indicated in CSD.
847 * Address this by setting the read timeout to a "reasonably high"
848 * value. For the cards tested, 300ms has proven enough. If necessary,
849 * this value can be increased if other problematic cards require this.
851 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
852 data->timeout_ns = 300000000;
853 data->timeout_clks = 0;
857 * Some cards need very high timeouts if driven in SPI mode.
858 * The worst observed timeout was 900ms after writing a
859 * continuous stream of data until the internal logic
862 if (mmc_host_is_spi(card->host)) {
863 if (data->flags & MMC_DATA_WRITE) {
864 if (data->timeout_ns < 1000000000)
865 data->timeout_ns = 1000000000; /* 1s */
867 if (data->timeout_ns < 100000000)
868 data->timeout_ns = 100000000; /* 100ms */
872 EXPORT_SYMBOL(mmc_set_data_timeout);
875 * mmc_align_data_size - pads a transfer size to a more optimal value
876 * @card: the MMC card associated with the data transfer
877 * @sz: original transfer size
879 * Pads the original data size with a number of extra bytes in
880 * order to avoid controller bugs and/or performance hits
881 * (e.g. some controllers revert to PIO for certain sizes).
883 * Returns the improved size, which might be unmodified.
885 * Note that this function is only relevant when issuing a
886 * single scatter gather entry.
888 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
891 * FIXME: We don't have a system for the controller to tell
892 * the core about its problems yet, so for now we just 32-bit
895 sz = ((sz + 3) / 4) * 4;
899 EXPORT_SYMBOL(mmc_align_data_size);
902 * __mmc_claim_host - exclusively claim a host
903 * @host: mmc host to claim
904 * @abort: whether or not the operation should be aborted
906 * Claim a host for a set of operations. If @abort is non null and
907 * dereference a non-zero value then this will return prematurely with
908 * that non-zero value without acquiring the lock. Returns zero
909 * with the lock held otherwise.
911 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
913 DECLARE_WAITQUEUE(wait, current);
919 add_wait_queue(&host->wq, &wait);
920 spin_lock_irqsave(&host->lock, flags);
922 set_current_state(TASK_UNINTERRUPTIBLE);
923 stop = abort ? atomic_read(abort) : 0;
924 if (stop || !host->claimed || host->claimer == current)
926 spin_unlock_irqrestore(&host->lock, flags);
928 spin_lock_irqsave(&host->lock, flags);
930 set_current_state(TASK_RUNNING);
933 host->claimer = current;
934 host->claim_cnt += 1;
937 spin_unlock_irqrestore(&host->lock, flags);
938 remove_wait_queue(&host->wq, &wait);
939 if (host->ops->enable && !stop && host->claim_cnt == 1)
940 host->ops->enable(host);
944 EXPORT_SYMBOL(__mmc_claim_host);
947 * mmc_release_host - release a host
948 * @host: mmc host to release
950 * Release a MMC host, allowing others to claim the host
951 * for their operations.
953 void mmc_release_host(struct mmc_host *host)
957 WARN_ON(!host->claimed);
959 if (host->ops->disable && host->claim_cnt == 1)
960 host->ops->disable(host);
962 spin_lock_irqsave(&host->lock, flags);
963 if (--host->claim_cnt) {
964 /* Release for nested claim */
965 spin_unlock_irqrestore(&host->lock, flags);
968 host->claimer = NULL;
969 spin_unlock_irqrestore(&host->lock, flags);
973 EXPORT_SYMBOL(mmc_release_host);
976 * This is a helper function, which fetches a runtime pm reference for the
977 * card device and also claims the host.
979 void mmc_get_card(struct mmc_card *card)
981 pm_runtime_get_sync(&card->dev);
982 mmc_claim_host(card->host);
984 EXPORT_SYMBOL(mmc_get_card);
987 * This is a helper function, which releases the host and drops the runtime
988 * pm reference for the card device.
990 void mmc_put_card(struct mmc_card *card)
992 mmc_release_host(card->host);
993 pm_runtime_mark_last_busy(&card->dev);
994 pm_runtime_put_autosuspend(&card->dev);
996 EXPORT_SYMBOL(mmc_put_card);
999 * Internal function that does the actual ios call to the host driver,
1000 * optionally printing some debug output.
1002 static inline void mmc_set_ios(struct mmc_host *host)
1004 struct mmc_ios *ios = &host->ios;
1006 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1007 "width %u timing %u\n",
1008 mmc_hostname(host), ios->clock, ios->bus_mode,
1009 ios->power_mode, ios->chip_select, ios->vdd,
1010 ios->bus_width, ios->timing);
1013 mmc_set_ungated(host);
1014 host->ops->set_ios(host, ios);
1018 * Control chip select pin on a host.
1020 void mmc_set_chip_select(struct mmc_host *host, int mode)
1022 mmc_host_clk_hold(host);
1023 host->ios.chip_select = mode;
1025 mmc_host_clk_release(host);
1029 * Sets the host clock to the highest possible frequency that
1032 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
1034 WARN_ON(hz < host->f_min);
1036 if (hz > host->f_max)
1039 host->ios.clock = hz;
1043 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1045 mmc_host_clk_hold(host);
1046 __mmc_set_clock(host, hz);
1047 mmc_host_clk_release(host);
1050 #ifdef CONFIG_MMC_CLKGATE
1052 * This gates the clock by setting it to 0 Hz.
1054 void mmc_gate_clock(struct mmc_host *host)
1056 unsigned long flags;
1058 spin_lock_irqsave(&host->clk_lock, flags);
1059 host->clk_old = host->ios.clock;
1060 host->ios.clock = 0;
1061 host->clk_gated = true;
1062 spin_unlock_irqrestore(&host->clk_lock, flags);
1067 * This restores the clock from gating by using the cached
1070 void mmc_ungate_clock(struct mmc_host *host)
1073 * We should previously have gated the clock, so the clock shall
1074 * be 0 here! The clock may however be 0 during initialization,
1075 * when some request operations are performed before setting
1076 * the frequency. When ungate is requested in that situation
1077 * we just ignore the call.
1079 if (host->clk_old) {
1080 BUG_ON(host->ios.clock);
1081 /* This call will also set host->clk_gated to false */
1082 __mmc_set_clock(host, host->clk_old);
1086 void mmc_set_ungated(struct mmc_host *host)
1088 unsigned long flags;
1091 * We've been given a new frequency while the clock is gated,
1092 * so make sure we regard this as ungating it.
1094 spin_lock_irqsave(&host->clk_lock, flags);
1095 host->clk_gated = false;
1096 spin_unlock_irqrestore(&host->clk_lock, flags);
1100 void mmc_set_ungated(struct mmc_host *host)
1106 * Change the bus mode (open drain/push-pull) of a host.
1108 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1110 mmc_host_clk_hold(host);
1111 host->ios.bus_mode = mode;
1113 mmc_host_clk_release(host);
1117 * Change data bus width of a host.
1119 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1121 mmc_host_clk_hold(host);
1122 host->ios.bus_width = width;
1124 mmc_host_clk_release(host);
1128 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1129 * @vdd: voltage (mV)
1130 * @low_bits: prefer low bits in boundary cases
1132 * This function returns the OCR bit number according to the provided @vdd
1133 * value. If conversion is not possible a negative errno value returned.
1135 * Depending on the @low_bits flag the function prefers low or high OCR bits
1136 * on boundary voltages. For example,
1137 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1138 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1140 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1142 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1144 const int max_bit = ilog2(MMC_VDD_35_36);
1147 if (vdd < 1650 || vdd > 3600)
1150 if (vdd >= 1650 && vdd <= 1950)
1151 return ilog2(MMC_VDD_165_195);
1156 /* Base 2000 mV, step 100 mV, bit's base 8. */
1157 bit = (vdd - 2000) / 100 + 8;
1164 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1165 * @vdd_min: minimum voltage value (mV)
1166 * @vdd_max: maximum voltage value (mV)
1168 * This function returns the OCR mask bits according to the provided @vdd_min
1169 * and @vdd_max values. If conversion is not possible the function returns 0.
1171 * Notes wrt boundary cases:
1172 * This function sets the OCR bits for all boundary voltages, for example
1173 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1174 * MMC_VDD_34_35 mask.
1176 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1180 if (vdd_max < vdd_min)
1183 /* Prefer high bits for the boundary vdd_max values. */
1184 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1188 /* Prefer low bits for the boundary vdd_min values. */
1189 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1193 /* Fill the mask, from max bit to min bit. */
1194 while (vdd_max >= vdd_min)
1195 mask |= 1 << vdd_max--;
1199 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1204 * mmc_of_parse_voltage - return mask of supported voltages
1205 * @np: The device node need to be parsed.
1206 * @mask: mask of voltages available for MMC/SD/SDIO
1208 * 1. Return zero on success.
1209 * 2. Return negative errno: voltage-range is invalid.
1211 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1213 const u32 *voltage_ranges;
1216 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1217 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1218 if (!voltage_ranges || !num_ranges) {
1219 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1223 for (i = 0; i < num_ranges; i++) {
1224 const int j = i * 2;
1227 ocr_mask = mmc_vddrange_to_ocrmask(
1228 be32_to_cpu(voltage_ranges[j]),
1229 be32_to_cpu(voltage_ranges[j + 1]));
1231 pr_err("%s: voltage-range #%d is invalid\n",
1240 EXPORT_SYMBOL(mmc_of_parse_voltage);
1242 #endif /* CONFIG_OF */
1244 #ifdef CONFIG_REGULATOR
1247 * mmc_regulator_get_ocrmask - return mask of supported voltages
1248 * @supply: regulator to use
1250 * This returns either a negative errno, or a mask of voltages that
1251 * can be provided to MMC/SD/SDIO devices using the specified voltage
1252 * regulator. This would normally be called before registering the
1255 int mmc_regulator_get_ocrmask(struct regulator *supply)
1261 count = regulator_count_voltages(supply);
1265 for (i = 0; i < count; i++) {
1269 vdd_uV = regulator_list_voltage(supply, i);
1273 vdd_mV = vdd_uV / 1000;
1274 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1279 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1282 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1283 * @mmc: the host to regulate
1284 * @supply: regulator to use
1285 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1287 * Returns zero on success, else negative errno.
1289 * MMC host drivers may use this to enable or disable a regulator using
1290 * a particular supply voltage. This would normally be called from the
1293 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1294 struct regulator *supply,
1295 unsigned short vdd_bit)
1305 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1306 * bits this regulator doesn't quite support ... don't
1307 * be too picky, most cards and regulators are OK with
1308 * a 0.1V range goof (it's a small error percentage).
1310 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1312 min_uV = 1650 * 1000;
1313 max_uV = 1950 * 1000;
1315 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1316 max_uV = min_uV + 100 * 1000;
1320 * If we're using a fixed/static regulator, don't call
1321 * regulator_set_voltage; it would fail.
1323 voltage = regulator_get_voltage(supply);
1325 if (!regulator_can_change_voltage(supply))
1326 min_uV = max_uV = voltage;
1330 else if (voltage < min_uV || voltage > max_uV)
1331 result = regulator_set_voltage(supply, min_uV, max_uV);
1335 if (result == 0 && !mmc->regulator_enabled) {
1336 result = regulator_enable(supply);
1338 mmc->regulator_enabled = true;
1340 } else if (mmc->regulator_enabled) {
1341 result = regulator_disable(supply);
1343 mmc->regulator_enabled = false;
1347 dev_err(mmc_dev(mmc),
1348 "could not set regulator OCR (%d)\n", result);
1351 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1353 int mmc_regulator_get_supply(struct mmc_host *mmc)
1355 struct device *dev = mmc_dev(mmc);
1356 struct regulator *supply;
1359 supply = devm_regulator_get(dev, "vmmc");
1360 mmc->supply.vmmc = supply;
1361 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1364 return PTR_ERR(supply);
1366 ret = mmc_regulator_get_ocrmask(supply);
1368 mmc->ocr_avail = ret;
1370 dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
1374 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1376 #endif /* CONFIG_REGULATOR */
1379 * Mask off any voltages we don't support and select
1380 * the lowest voltage
1382 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1387 * Sanity check the voltages that the card claims to
1391 dev_warn(mmc_dev(host),
1392 "card claims to support voltages below defined range\n");
1396 ocr &= host->ocr_avail;
1398 dev_warn(mmc_dev(host), "no support for card's volts\n");
1402 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1405 mmc_power_cycle(host, ocr);
1409 if (bit != host->ios.vdd)
1410 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1416 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1419 int old_signal_voltage = host->ios.signal_voltage;
1421 host->ios.signal_voltage = signal_voltage;
1422 if (host->ops->start_signal_voltage_switch) {
1423 mmc_host_clk_hold(host);
1424 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1425 mmc_host_clk_release(host);
1429 host->ios.signal_voltage = old_signal_voltage;
1435 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1437 struct mmc_command cmd = {0};
1444 * Send CMD11 only if the request is to switch the card to
1447 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1448 return __mmc_set_signal_voltage(host, signal_voltage);
1451 * If we cannot switch voltages, return failure so the caller
1452 * can continue without UHS mode
1454 if (!host->ops->start_signal_voltage_switch)
1456 if (!host->ops->card_busy)
1457 pr_warning("%s: cannot verify signal voltage switch\n",
1458 mmc_hostname(host));
1460 cmd.opcode = SD_SWITCH_VOLTAGE;
1462 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1464 err = mmc_wait_for_cmd(host, &cmd, 0);
1468 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1471 mmc_host_clk_hold(host);
1473 * The card should drive cmd and dat[0:3] low immediately
1474 * after the response of cmd11, but wait 1 ms to be sure
1477 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1482 * During a signal voltage level switch, the clock must be gated
1483 * for 5 ms according to the SD spec
1485 clock = host->ios.clock;
1486 host->ios.clock = 0;
1489 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1491 * Voltages may not have been switched, but we've already
1492 * sent CMD11, so a power cycle is required anyway
1498 /* Keep clock gated for at least 5 ms */
1500 host->ios.clock = clock;
1503 /* Wait for at least 1 ms according to spec */
1507 * Failure to switch is indicated by the card holding
1510 if (host->ops->card_busy && host->ops->card_busy(host))
1515 pr_debug("%s: Signal voltage switch failed, "
1516 "power cycling card\n", mmc_hostname(host));
1517 mmc_power_cycle(host, ocr);
1520 mmc_host_clk_release(host);
1526 * Select timing parameters for host.
1528 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1530 mmc_host_clk_hold(host);
1531 host->ios.timing = timing;
1533 mmc_host_clk_release(host);
1537 * Select appropriate driver type for host.
1539 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1541 mmc_host_clk_hold(host);
1542 host->ios.drv_type = drv_type;
1544 mmc_host_clk_release(host);
1548 * Apply power to the MMC stack. This is a two-stage process.
1549 * First, we enable power to the card without the clock running.
1550 * We then wait a bit for the power to stabilise. Finally,
1551 * enable the bus drivers and clock to the card.
1553 * We must _NOT_ enable the clock prior to power stablising.
1555 * If a host does all the power sequencing itself, ignore the
1556 * initial MMC_POWER_UP stage.
1558 void mmc_power_up(struct mmc_host *host, u32 ocr)
1560 if (host->ios.power_mode == MMC_POWER_ON)
1563 mmc_host_clk_hold(host);
1565 host->ios.vdd = fls(ocr) - 1;
1566 if (mmc_host_is_spi(host))
1567 host->ios.chip_select = MMC_CS_HIGH;
1569 host->ios.chip_select = MMC_CS_DONTCARE;
1570 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1571 host->ios.power_mode = MMC_POWER_UP;
1572 host->ios.bus_width = MMC_BUS_WIDTH_1;
1573 host->ios.timing = MMC_TIMING_LEGACY;
1576 /* Set signal voltage to 3.3V */
1577 __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1580 * This delay should be sufficient to allow the power supply
1581 * to reach the minimum voltage.
1585 host->ios.clock = host->f_init;
1587 host->ios.power_mode = MMC_POWER_ON;
1591 * This delay must be at least 74 clock sizes, or 1 ms, or the
1592 * time required to reach a stable voltage.
1596 mmc_host_clk_release(host);
1599 void mmc_power_off(struct mmc_host *host)
1601 if (host->ios.power_mode == MMC_POWER_OFF)
1604 mmc_host_clk_hold(host);
1606 host->ios.clock = 0;
1609 if (!mmc_host_is_spi(host)) {
1610 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1611 host->ios.chip_select = MMC_CS_DONTCARE;
1613 host->ios.power_mode = MMC_POWER_OFF;
1614 host->ios.bus_width = MMC_BUS_WIDTH_1;
1615 host->ios.timing = MMC_TIMING_LEGACY;
1619 * Some configurations, such as the 802.11 SDIO card in the OLPC
1620 * XO-1.5, require a short delay after poweroff before the card
1621 * can be successfully turned on again.
1625 mmc_host_clk_release(host);
1628 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1630 mmc_power_off(host);
1631 /* Wait at least 1 ms according to SD spec */
1633 mmc_power_up(host, ocr);
1637 * Cleanup when the last reference to the bus operator is dropped.
1639 static void __mmc_release_bus(struct mmc_host *host)
1642 BUG_ON(host->bus_refs);
1643 BUG_ON(!host->bus_dead);
1645 host->bus_ops = NULL;
1649 * Increase reference count of bus operator
1651 static inline void mmc_bus_get(struct mmc_host *host)
1653 unsigned long flags;
1655 spin_lock_irqsave(&host->lock, flags);
1657 spin_unlock_irqrestore(&host->lock, flags);
1661 * Decrease reference count of bus operator and free it if
1662 * it is the last reference.
1664 static inline void mmc_bus_put(struct mmc_host *host)
1666 unsigned long flags;
1668 spin_lock_irqsave(&host->lock, flags);
1670 if ((host->bus_refs == 0) && host->bus_ops)
1671 __mmc_release_bus(host);
1672 spin_unlock_irqrestore(&host->lock, flags);
1676 int mmc_resume_bus(struct mmc_host *host)
1678 unsigned long flags;
1680 if (!mmc_bus_needs_resume(host))
1683 printk("%s: Starting deferred resume\n", mmc_hostname(host));
1684 spin_lock_irqsave(&host->lock, flags);
1685 host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME;
1686 host->rescan_disable = 0;
1687 spin_unlock_irqrestore(&host->lock, flags);
1690 if (host->bus_ops && !host->bus_dead) {
1692 BUG_ON(!host->bus_ops->resume);
1693 host->bus_ops->resume(host);
1696 if (host->bus_ops->detect && !host->bus_dead)
1697 host->bus_ops->detect(host);
1700 printk("%s: Deferred resume completed\n", mmc_hostname(host));
1704 EXPORT_SYMBOL(mmc_resume_bus);
1708 * Assign a mmc bus handler to a host. Only one bus handler may control a
1709 * host at any given time.
1711 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1713 unsigned long flags;
1718 WARN_ON(!host->claimed);
1720 spin_lock_irqsave(&host->lock, flags);
1722 BUG_ON(host->bus_ops);
1723 BUG_ON(host->bus_refs);
1725 host->bus_ops = ops;
1729 spin_unlock_irqrestore(&host->lock, flags);
1733 * Remove the current bus handler from a host.
1735 void mmc_detach_bus(struct mmc_host *host)
1737 unsigned long flags;
1741 WARN_ON(!host->claimed);
1742 WARN_ON(!host->bus_ops);
1744 spin_lock_irqsave(&host->lock, flags);
1748 spin_unlock_irqrestore(&host->lock, flags);
1753 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1756 #ifdef CONFIG_MMC_DEBUG
1757 unsigned long flags;
1758 spin_lock_irqsave(&host->lock, flags);
1759 WARN_ON(host->removed);
1760 spin_unlock_irqrestore(&host->lock, flags);
1764 * If the device is configured as wakeup, we prevent a new sleep for
1765 * 5 s to give provision for user space to consume the event.
1767 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1768 device_can_wakeup(mmc_dev(host)))
1769 pm_wakeup_event(mmc_dev(host), 5000);
1771 host->detect_change = 1;
1772 mmc_schedule_delayed_work(&host->detect, delay);
1776 * mmc_detect_change - process change of state on a MMC socket
1777 * @host: host which changed state.
1778 * @delay: optional delay to wait before detection (jiffies)
1780 * MMC drivers should call this when they detect a card has been
1781 * inserted or removed. The MMC layer will confirm that any
1782 * present card is still functional, and initialize any newly
1785 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1787 _mmc_detect_change(host, delay, true);
1789 EXPORT_SYMBOL(mmc_detect_change);
1791 void mmc_init_erase(struct mmc_card *card)
1795 if (is_power_of_2(card->erase_size))
1796 card->erase_shift = ffs(card->erase_size) - 1;
1798 card->erase_shift = 0;
1801 * It is possible to erase an arbitrarily large area of an SD or MMC
1802 * card. That is not desirable because it can take a long time
1803 * (minutes) potentially delaying more important I/O, and also the
1804 * timeout calculations become increasingly hugely over-estimated.
1805 * Consequently, 'pref_erase' is defined as a guide to limit erases
1806 * to that size and alignment.
1808 * For SD cards that define Allocation Unit size, limit erases to one
1809 * Allocation Unit at a time. For MMC cards that define High Capacity
1810 * Erase Size, whether it is switched on or not, limit to that size.
1811 * Otherwise just have a stab at a good value. For modern cards it
1812 * will end up being 4MiB. Note that if the value is too small, it
1813 * can end up taking longer to erase.
1815 if (mmc_card_sd(card) && card->ssr.au) {
1816 card->pref_erase = card->ssr.au;
1817 card->erase_shift = ffs(card->ssr.au) - 1;
1818 } else if (card->ext_csd.hc_erase_size) {
1819 card->pref_erase = card->ext_csd.hc_erase_size;
1821 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1823 card->pref_erase = 512 * 1024 / 512;
1825 card->pref_erase = 1024 * 1024 / 512;
1827 card->pref_erase = 2 * 1024 * 1024 / 512;
1829 card->pref_erase = 4 * 1024 * 1024 / 512;
1830 if (card->pref_erase < card->erase_size)
1831 card->pref_erase = card->erase_size;
1833 sz = card->pref_erase % card->erase_size;
1835 card->pref_erase += card->erase_size - sz;
1840 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1841 unsigned int arg, unsigned int qty)
1843 unsigned int erase_timeout;
1845 if (arg == MMC_DISCARD_ARG ||
1846 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1847 erase_timeout = card->ext_csd.trim_timeout;
1848 } else if (card->ext_csd.erase_group_def & 1) {
1849 /* High Capacity Erase Group Size uses HC timeouts */
1850 if (arg == MMC_TRIM_ARG)
1851 erase_timeout = card->ext_csd.trim_timeout;
1853 erase_timeout = card->ext_csd.hc_erase_timeout;
1855 /* CSD Erase Group Size uses write timeout */
1856 unsigned int mult = (10 << card->csd.r2w_factor);
1857 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1858 unsigned int timeout_us;
1860 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1861 if (card->csd.tacc_ns < 1000000)
1862 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1864 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1867 * ios.clock is only a target. The real clock rate might be
1868 * less but not that much less, so fudge it by multiplying by 2.
1871 timeout_us += (timeout_clks * 1000) /
1872 (mmc_host_clk_rate(card->host) / 1000);
1874 erase_timeout = timeout_us / 1000;
1877 * Theoretically, the calculation could underflow so round up
1878 * to 1ms in that case.
1884 /* Multiplier for secure operations */
1885 if (arg & MMC_SECURE_ARGS) {
1886 if (arg == MMC_SECURE_ERASE_ARG)
1887 erase_timeout *= card->ext_csd.sec_erase_mult;
1889 erase_timeout *= card->ext_csd.sec_trim_mult;
1892 erase_timeout *= qty;
1895 * Ensure at least a 1 second timeout for SPI as per
1896 * 'mmc_set_data_timeout()'
1898 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1899 erase_timeout = 1000;
1901 return erase_timeout;
1904 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1908 unsigned int erase_timeout;
1910 if (card->ssr.erase_timeout) {
1911 /* Erase timeout specified in SD Status Register (SSR) */
1912 erase_timeout = card->ssr.erase_timeout * qty +
1913 card->ssr.erase_offset;
1916 * Erase timeout not specified in SD Status Register (SSR) so
1917 * use 250ms per write block.
1919 erase_timeout = 250 * qty;
1922 /* Must not be less than 1 second */
1923 if (erase_timeout < 1000)
1924 erase_timeout = 1000;
1926 return erase_timeout;
1929 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1933 if (mmc_card_sd(card))
1934 return mmc_sd_erase_timeout(card, arg, qty);
1936 return mmc_mmc_erase_timeout(card, arg, qty);
1939 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1940 unsigned int to, unsigned int arg)
1942 struct mmc_command cmd = {0};
1943 unsigned int qty = 0;
1944 unsigned long timeout;
1945 unsigned int fr, nr;
1952 * qty is used to calculate the erase timeout which depends on how many
1953 * erase groups (or allocation units in SD terminology) are affected.
1954 * We count erasing part of an erase group as one erase group.
1955 * For SD, the allocation units are always a power of 2. For MMC, the
1956 * erase group size is almost certainly also power of 2, but it does not
1957 * seem to insist on that in the JEDEC standard, so we fall back to
1958 * division in that case. SD may not specify an allocation unit size,
1959 * in which case the timeout is based on the number of write blocks.
1961 * Note that the timeout for secure trim 2 will only be correct if the
1962 * number of erase groups specified is the same as the total of all
1963 * preceding secure trim 1 commands. Since the power may have been
1964 * lost since the secure trim 1 commands occurred, it is generally
1965 * impossible to calculate the secure trim 2 timeout correctly.
1967 if (card->erase_shift)
1968 qty += ((to >> card->erase_shift) -
1969 (from >> card->erase_shift)) + 1;
1970 else if (mmc_card_sd(card))
1971 qty += to - from + 1;
1973 qty += ((to / card->erase_size) -
1974 (from / card->erase_size)) + 1;
1976 if (!mmc_card_blockaddr(card)) {
1981 if (mmc_card_sd(card))
1982 cmd.opcode = SD_ERASE_WR_BLK_START;
1984 cmd.opcode = MMC_ERASE_GROUP_START;
1986 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1987 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1989 pr_err("mmc_erase: group start error %d, "
1990 "status %#x\n", err, cmd.resp[0]);
1995 memset(&cmd, 0, sizeof(struct mmc_command));
1996 if (mmc_card_sd(card))
1997 cmd.opcode = SD_ERASE_WR_BLK_END;
1999 cmd.opcode = MMC_ERASE_GROUP_END;
2001 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2002 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2004 pr_err("mmc_erase: group end error %d, status %#x\n",
2010 memset(&cmd, 0, sizeof(struct mmc_command));
2011 cmd.opcode = MMC_ERASE;
2013 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2014 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
2015 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2017 pr_err("mmc_erase: erase error %d, status %#x\n",
2023 if (mmc_host_is_spi(card->host))
2026 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2028 memset(&cmd, 0, sizeof(struct mmc_command));
2029 cmd.opcode = MMC_SEND_STATUS;
2030 cmd.arg = card->rca << 16;
2031 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2032 /* Do not retry else we can't see errors */
2033 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2034 if (err || (cmd.resp[0] & 0xFDF92000)) {
2035 pr_err("error %d requesting status %#x\n",
2041 /* Timeout if the device never becomes ready for data and
2042 * never leaves the program state.
2044 if (time_after(jiffies, timeout)) {
2045 pr_err("%s: Card stuck in programming state! %s\n",
2046 mmc_hostname(card->host), __func__);
2051 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2052 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2059 * mmc_erase - erase sectors.
2060 * @card: card to erase
2061 * @from: first sector to erase
2062 * @nr: number of sectors to erase
2063 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2065 * Caller must claim host before calling this function.
2067 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2070 unsigned int rem, to = from + nr;
2072 if (!(card->host->caps & MMC_CAP_ERASE) ||
2073 !(card->csd.cmdclass & CCC_ERASE))
2076 if (!card->erase_size)
2079 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2082 if ((arg & MMC_SECURE_ARGS) &&
2083 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2086 if ((arg & MMC_TRIM_ARGS) &&
2087 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2090 if (arg == MMC_SECURE_ERASE_ARG) {
2091 if (from % card->erase_size || nr % card->erase_size)
2095 if (arg == MMC_ERASE_ARG) {
2096 rem = from % card->erase_size;
2098 rem = card->erase_size - rem;
2105 rem = nr % card->erase_size;
2118 /* 'from' and 'to' are inclusive */
2121 return mmc_do_erase(card, from, to, arg);
2123 EXPORT_SYMBOL(mmc_erase);
2125 int mmc_can_erase(struct mmc_card *card)
2127 if ((card->host->caps & MMC_CAP_ERASE) &&
2128 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2132 EXPORT_SYMBOL(mmc_can_erase);
2134 int mmc_can_trim(struct mmc_card *card)
2136 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2137 !(card->quirks & MMC_QUIRK_TRIM_UNSTABLE))
2141 EXPORT_SYMBOL(mmc_can_trim);
2143 int mmc_can_discard(struct mmc_card *card)
2146 * As there's no way to detect the discard support bit at v4.5
2147 * use the s/w feature support filed.
2149 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2153 EXPORT_SYMBOL(mmc_can_discard);
2155 int mmc_can_sanitize(struct mmc_card *card)
2157 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2159 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2163 EXPORT_SYMBOL(mmc_can_sanitize);
2165 int mmc_can_secure_erase_trim(struct mmc_card *card)
2167 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
2171 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2173 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2176 if (!card->erase_size)
2178 if (from % card->erase_size || nr % card->erase_size)
2182 EXPORT_SYMBOL(mmc_erase_group_aligned);
2184 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2187 struct mmc_host *host = card->host;
2188 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2189 unsigned int last_timeout = 0;
2191 if (card->erase_shift)
2192 max_qty = UINT_MAX >> card->erase_shift;
2193 else if (mmc_card_sd(card))
2196 max_qty = UINT_MAX / card->erase_size;
2198 /* Find the largest qty with an OK timeout */
2201 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2202 timeout = mmc_erase_timeout(card, arg, qty + x);
2203 if (timeout > host->max_discard_to)
2205 if (timeout < last_timeout)
2207 last_timeout = timeout;
2219 /* Convert qty to sectors */
2220 if (card->erase_shift)
2221 max_discard = --qty << card->erase_shift;
2222 else if (mmc_card_sd(card))
2225 max_discard = --qty * card->erase_size;
2230 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2232 struct mmc_host *host = card->host;
2233 unsigned int max_discard, max_trim;
2235 if (!host->max_discard_to)
2239 * Without erase_group_def set, MMC erase timeout depends on clock
2240 * frequence which can change. In that case, the best choice is
2241 * just the preferred erase size.
2243 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2244 return card->pref_erase;
2246 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2247 if (mmc_can_trim(card)) {
2248 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2249 if (max_trim < max_discard)
2250 max_discard = max_trim;
2251 } else if (max_discard < card->erase_size) {
2254 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2255 mmc_hostname(host), max_discard, host->max_discard_to);
2258 EXPORT_SYMBOL(mmc_calc_max_discard);
2260 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2262 struct mmc_command cmd = {0};
2264 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
2267 cmd.opcode = MMC_SET_BLOCKLEN;
2269 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2270 return mmc_wait_for_cmd(card->host, &cmd, 5);
2272 EXPORT_SYMBOL(mmc_set_blocklen);
2274 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2277 struct mmc_command cmd = {0};
2279 cmd.opcode = MMC_SET_BLOCK_COUNT;
2280 cmd.arg = blockcount & 0x0000FFFF;
2283 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2284 return mmc_wait_for_cmd(card->host, &cmd, 5);
2286 EXPORT_SYMBOL(mmc_set_blockcount);
2288 static void mmc_hw_reset_for_init(struct mmc_host *host)
2290 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2292 mmc_host_clk_hold(host);
2293 host->ops->hw_reset(host);
2294 mmc_host_clk_release(host);
2297 int mmc_can_reset(struct mmc_card *card)
2301 if (!mmc_card_mmc(card))
2303 rst_n_function = card->ext_csd.rst_n_function;
2304 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2308 EXPORT_SYMBOL(mmc_can_reset);
2310 static int mmc_do_hw_reset(struct mmc_host *host, int check)
2312 struct mmc_card *card = host->card;
2314 if (!host->bus_ops->power_restore)
2317 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2323 if (!mmc_can_reset(card))
2326 mmc_host_clk_hold(host);
2327 mmc_set_clock(host, host->f_init);
2329 host->ops->hw_reset(host);
2331 /* If the reset has happened, then a status command will fail */
2333 struct mmc_command cmd = {0};
2336 cmd.opcode = MMC_SEND_STATUS;
2337 if (!mmc_host_is_spi(card->host))
2338 cmd.arg = card->rca << 16;
2339 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
2340 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2342 mmc_host_clk_release(host);
2347 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
2348 if (mmc_host_is_spi(host)) {
2349 host->ios.chip_select = MMC_CS_HIGH;
2350 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
2352 host->ios.chip_select = MMC_CS_DONTCARE;
2353 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
2355 host->ios.bus_width = MMC_BUS_WIDTH_1;
2356 host->ios.timing = MMC_TIMING_LEGACY;
2359 mmc_host_clk_release(host);
2361 return host->bus_ops->power_restore(host);
2364 int mmc_hw_reset(struct mmc_host *host)
2366 return mmc_do_hw_reset(host, 0);
2368 EXPORT_SYMBOL(mmc_hw_reset);
2370 int mmc_hw_reset_check(struct mmc_host *host)
2372 return mmc_do_hw_reset(host, 1);
2374 EXPORT_SYMBOL(mmc_hw_reset_check);
2376 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2378 host->f_init = freq;
2380 #ifdef CONFIG_MMC_DEBUG
2381 pr_info("%s: %s: trying to init card at %u Hz\n",
2382 mmc_hostname(host), __func__, host->f_init);
2384 mmc_power_up(host, host->ocr_avail);
2387 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2388 * do a hardware reset if possible.
2390 mmc_hw_reset_for_init(host);
2393 * sdio_reset sends CMD52 to reset card. Since we do not know
2394 * if the card is being re-initialized, just send it. CMD52
2395 * should be ignored by SD/eMMC cards.
2401 mmc_send_if_cond(host, host->ocr_avail);
2403 /* Order's important: probe SDIO, then SD, then MMC */
2404 if (!mmc_attach_sdio(host))
2406 if (!mmc_attach_sd(host))
2408 if (!mmc_attach_mmc(host))
2412 * Simplifying the process of initializing the card.
2413 * modifyed by xbw, at 2014-03-14
2415 if(host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
2420 if(host->restrict_caps & (RESTRICT_CARD_TYPE_SDIO |RESTRICT_CARD_TYPE_SD))
2421 mmc_send_if_cond(host, host->ocr_avail);
2423 /* Order's important: probe SDIO, then SD, then MMC */
2424 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) &&
2425 !mmc_attach_sdio(host))
2427 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SD) &&
2428 !mmc_attach_sd(host))
2430 if ((host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) &&
2431 !mmc_attach_mmc(host))
2435 mmc_power_off(host);
2439 int _mmc_detect_card_removed(struct mmc_host *host)
2443 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
2446 if (!host->card || mmc_card_removed(host->card))
2449 ret = host->bus_ops->alive(host);
2452 * Card detect status and alive check may be out of sync if card is
2453 * removed slowly, when card detect switch changes while card/slot
2454 * pads are still contacted in hardware (refer to "SD Card Mechanical
2455 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2456 * detect work 200ms later for this case.
2458 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2459 mmc_detect_change(host, msecs_to_jiffies(200));
2460 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2464 mmc_card_set_removed(host->card);
2465 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2471 int mmc_detect_card_removed(struct mmc_host *host)
2473 struct mmc_card *card = host->card;
2476 WARN_ON(!host->claimed);
2481 ret = mmc_card_removed(card);
2483 * The card will be considered unchanged unless we have been asked to
2484 * detect a change or host requires polling to provide card detection.
2486 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2489 host->detect_change = 0;
2491 ret = _mmc_detect_card_removed(host);
2492 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2494 * Schedule a detect work as soon as possible to let a
2495 * rescan handle the card removal.
2497 cancel_delayed_work(&host->detect);
2498 _mmc_detect_change(host, 0, false);
2504 EXPORT_SYMBOL(mmc_detect_card_removed);
2506 void mmc_rescan(struct work_struct *work)
2508 struct mmc_host *host =
2509 container_of(work, struct mmc_host, detect.work);
2511 bool extend_wakelock = false;
2513 if (host->rescan_disable)
2516 /* If there is a non-removable card registered, only scan once */
2517 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2519 host->rescan_entered = 1;
2524 * if there is a _removable_ card registered, check whether it is
2527 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
2528 && !(host->caps & MMC_CAP_NONREMOVABLE))
2529 host->bus_ops->detect(host);
2531 host->detect_change = 0;
2533 /* If the card was removed the bus will be marked
2534 * as dead - extend the wakelock so userspace
2537 extend_wakelock = 1;
2540 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2541 * the card is no longer present.
2546 /* if there still is a card present, stop here */
2547 if (host->bus_ops != NULL) {
2553 * Only we can add a new handler, so it's safe to
2554 * release the lock here.
2558 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2559 host->ops->get_cd(host) == 0) {
2560 mmc_claim_host(host);
2561 mmc_power_off(host);
2562 mmc_release_host(host);
2566 mmc_claim_host(host);
2567 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2568 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
2569 extend_wakelock = true;
2572 if (freqs[i] <= host->f_min)
2575 mmc_release_host(host);
2578 if (extend_wakelock)
2579 wake_lock_timeout(&host->detect_wake_lock, HZ / 2);
2581 wake_unlock(&host->detect_wake_lock);
2582 if (host->caps & MMC_CAP_NEEDS_POLL) {
2583 wake_lock(&host->detect_wake_lock);
2584 mmc_schedule_delayed_work(&host->detect, HZ);
2588 void mmc_start_host(struct mmc_host *host)
2590 host->f_init = max(freqs[0], host->f_min);
2591 host->rescan_disable = 0;
2592 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2593 mmc_power_off(host);
2595 mmc_power_up(host, host->ocr_avail);
2596 _mmc_detect_change(host, 0, false);
2599 void mmc_stop_host(struct mmc_host *host)
2601 #ifdef CONFIG_MMC_DEBUG
2602 unsigned long flags;
2603 spin_lock_irqsave(&host->lock, flags);
2605 spin_unlock_irqrestore(&host->lock, flags);
2608 host->rescan_disable = 1;
2609 if (cancel_delayed_work_sync(&host->detect))
2610 wake_unlock(&host->detect_wake_lock);
2611 mmc_flush_scheduled_work();
2613 /* clear pm flags now and let card drivers set them as needed */
2617 if (host->bus_ops && !host->bus_dead) {
2618 /* Calling bus_ops->remove() with a claimed host can deadlock */
2619 host->bus_ops->remove(host);
2620 mmc_claim_host(host);
2621 mmc_detach_bus(host);
2622 mmc_power_off(host);
2623 mmc_release_host(host);
2631 mmc_power_off(host);
2634 int mmc_power_save_host(struct mmc_host *host)
2638 #ifdef CONFIG_MMC_DEBUG
2639 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2644 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2649 if (host->bus_ops->power_save)
2650 ret = host->bus_ops->power_save(host);
2654 mmc_power_off(host);
2658 EXPORT_SYMBOL(mmc_power_save_host);
2660 int mmc_power_restore_host(struct mmc_host *host)
2664 #ifdef CONFIG_MMC_DEBUG
2665 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2670 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2675 mmc_power_up(host, host->card->ocr);
2676 ret = host->bus_ops->power_restore(host);
2682 EXPORT_SYMBOL(mmc_power_restore_host);
2685 * Flush the cache to the non-volatile storage.
2687 int mmc_flush_cache(struct mmc_card *card)
2689 struct mmc_host *host = card->host;
2692 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2695 if (mmc_card_mmc(card) &&
2696 (card->ext_csd.cache_size > 0) &&
2697 (card->ext_csd.cache_ctrl & 1)) {
2698 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2699 EXT_CSD_FLUSH_CACHE, 1, 0);
2701 pr_err("%s: cache flush error %d\n",
2702 mmc_hostname(card->host), err);
2707 EXPORT_SYMBOL(mmc_flush_cache);
2710 * Turn the cache ON/OFF.
2711 * Turning the cache OFF shall trigger flushing of the data
2712 * to the non-volatile storage.
2713 * This function should be called with host claimed
2715 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2717 struct mmc_card *card = host->card;
2718 unsigned int timeout;
2721 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2722 mmc_card_is_removable(host))
2725 if (card && mmc_card_mmc(card) &&
2726 (card->ext_csd.cache_size > 0)) {
2729 if (card->ext_csd.cache_ctrl ^ enable) {
2730 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2731 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2732 EXT_CSD_CACHE_CTRL, enable, timeout);
2734 pr_err("%s: cache %s error %d\n",
2735 mmc_hostname(card->host),
2736 enable ? "on" : "off",
2739 card->ext_csd.cache_ctrl = enable;
2745 EXPORT_SYMBOL(mmc_cache_ctrl);
2749 /* Do the card removal on suspend if card is assumed removeable
2750 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2753 int mmc_pm_notify(struct notifier_block *notify_block,
2754 unsigned long mode, void *unused)
2756 struct mmc_host *host = container_of(
2757 notify_block, struct mmc_host, pm_notify);
2758 unsigned long flags;
2762 case PM_HIBERNATION_PREPARE:
2763 case PM_SUSPEND_PREPARE:
2764 spin_lock_irqsave(&host->lock, flags);
2765 if (mmc_bus_needs_resume(host)) {
2766 spin_unlock_irqrestore(&host->lock, flags);
2769 host->rescan_disable = 1;
2770 spin_unlock_irqrestore(&host->lock, flags);
2771 if (cancel_delayed_work_sync(&host->detect))
2772 wake_unlock(&host->detect_wake_lock);
2777 /* Validate prerequisites for suspend */
2778 if (host->bus_ops->pre_suspend)
2779 err = host->bus_ops->pre_suspend(host);
2780 if (!err && host->bus_ops->suspend)
2783 /* Calling bus_ops->remove() with a claimed host can deadlock */
2784 host->bus_ops->remove(host);
2785 mmc_claim_host(host);
2786 mmc_detach_bus(host);
2787 mmc_power_off(host);
2788 mmc_release_host(host);
2792 case PM_POST_SUSPEND:
2793 case PM_POST_HIBERNATION:
2794 case PM_POST_RESTORE:
2796 spin_lock_irqsave(&host->lock, flags);
2797 if (mmc_bus_manual_resume(host)) {
2798 spin_unlock_irqrestore(&host->lock, flags);
2801 host->rescan_disable = 0;
2802 spin_unlock_irqrestore(&host->lock, flags);
2803 _mmc_detect_change(host, 0, false);
2812 * mmc_init_context_info() - init synchronization context
2815 * Init struct context_info needed to implement asynchronous
2816 * request mechanism, used by mmc core, host driver and mmc requests
2819 void mmc_init_context_info(struct mmc_host *host)
2821 spin_lock_init(&host->context_info.lock);
2822 host->context_info.is_new_req = false;
2823 host->context_info.is_done_rcv = false;
2824 host->context_info.is_waiting_last_req = false;
2825 init_waitqueue_head(&host->context_info.wait);
2828 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2829 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2830 struct sdio_cis *cis,
2831 struct sdio_cccr *cccr,
2832 struct sdio_embedded_func *funcs,
2835 host->embedded_sdio_data.cis = cis;
2836 host->embedded_sdio_data.cccr = cccr;
2837 host->embedded_sdio_data.funcs = funcs;
2838 host->embedded_sdio_data.num_funcs = num_funcs;
2841 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2844 static int __init mmc_init(void)
2848 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2852 ret = mmc_register_bus();
2854 goto destroy_workqueue;
2856 ret = mmc_register_host_class();
2858 goto unregister_bus;
2860 ret = sdio_register_bus();
2862 goto unregister_host_class;
2866 unregister_host_class:
2867 mmc_unregister_host_class();
2869 mmc_unregister_bus();
2871 destroy_workqueue(workqueue);
2876 static void __exit mmc_exit(void)
2878 sdio_unregister_bus();
2879 mmc_unregister_host_class();
2880 mmc_unregister_bus();
2881 destroy_workqueue(workqueue);
2884 subsys_initcall(mmc_init);
2885 module_exit(mmc_exit);
2887 MODULE_LICENSE("GPL");