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);
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 tsac %d ms nsac %d\n",
216 mmc_hostname(host), mrq->data->blksz,
217 mrq->data->blocks, mrq->data->flags,
218 mrq->data->timeout_ns / 1000000,
219 mrq->data->timeout_clks);
223 pr_debug("%s: CMD%u arg %08x flags %08x\n",
224 mmc_hostname(host), mrq->stop->opcode,
225 mrq->stop->arg, mrq->stop->flags);
228 WARN_ON(!host->claimed);
233 BUG_ON(mrq->data->blksz > host->max_blk_size);
234 BUG_ON(mrq->data->blocks > host->max_blk_count);
235 BUG_ON(mrq->data->blocks * mrq->data->blksz >
238 #ifdef CONFIG_MMC_DEBUG
240 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
242 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
245 mrq->cmd->data = mrq->data;
246 mrq->data->error = 0;
247 mrq->data->mrq = mrq;
249 mrq->data->stop = mrq->stop;
250 mrq->stop->error = 0;
251 mrq->stop->mrq = mrq;
254 mmc_host_clk_hold(host);
255 led_trigger_event(host->led, LED_FULL);
256 host->ops->request(host, mrq);
260 * mmc_start_bkops - start BKOPS for supported cards
261 * @card: MMC card to start BKOPS
262 * @form_exception: A flag to indicate if this function was
263 * called due to an exception raised by the card
265 * Start background operations whenever requested.
266 * When the urgent BKOPS bit is set in a R1 command response
267 * then background operations should be started immediately.
269 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
273 bool use_busy_signal;
277 if (!card->ext_csd.bkops_en || mmc_card_doing_bkops(card))
280 err = mmc_read_bkops_status(card);
282 pr_err("%s: Failed to read bkops status: %d\n",
283 mmc_hostname(card->host), err);
287 if (!card->ext_csd.raw_bkops_status)
290 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
294 mmc_claim_host(card->host);
295 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
296 timeout = MMC_BKOPS_MAX_TIMEOUT;
297 use_busy_signal = true;
300 use_busy_signal = false;
303 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
304 EXT_CSD_BKOPS_START, 1,
305 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_get_req_timeout(struct mmc_request *mrq, u32 *timeout)
437 if (!mrq->cmd->data) {
438 if (mrq->cmd->opcode == MMC_ERASE ||
439 (mrq->cmd->opcode == MMC_ERASE_GROUP_START) ||
440 (mrq->cmd->opcode == MMC_ERASE_GROUP_END) ||
441 (mrq->cmd->opcode == MMC_SEND_STATUS))
446 *timeout = mrq->cmd->data->blocks *
447 mrq->cmd->data->blksz * 500;
448 *timeout = (*timeout) ? (*timeout) : 1000;
453 if ((mrq->cmd->opcode == SD_IO_RW_DIRECT) ||
454 (mrq->cmd->opcode == SD_IO_RW_EXTENDED))
458 static void mmc_wait_for_req_done(struct mmc_host *host,
459 struct mmc_request *mrq)
461 struct mmc_command *cmd;
464 mmc_get_req_timeout(mrq, &timeout);
467 if (!wait_for_completion_timeout(&mrq->completion,
468 msecs_to_jiffies(timeout))) {
470 cmd->error = -ETIMEDOUT;
471 host->ops->post_tmo(host);
472 dev_err(mmc_dev(host),
473 "req failed (CMD%u): error = %d, timeout = %dms\n",
474 cmd->opcode, cmd->error, timeout);
482 * If host has timed out waiting for the sanitize
483 * to complete, card might be still in programming state
484 * so let's try to bring the card out of programming
487 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
488 if (!mmc_interrupt_hpi(host->card)) {
489 pr_warn("%s: %s: Interrupted sanitize\n",
490 mmc_hostname(host), __func__);
494 pr_err("%s: %s: Failed to interrupt sanitize\n",
495 mmc_hostname(host), __func__);
498 if (!cmd->error || !cmd->retries ||
499 mmc_card_removed(host->card))
502 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
503 mmc_hostname(host), cmd->opcode, cmd->error);
506 host->ops->request(host, mrq);
511 * mmc_pre_req - Prepare for a new request
512 * @host: MMC host to prepare command
513 * @mrq: MMC request to prepare for
514 * @is_first_req: true if there is no previous started request
515 * that may run in parellel to this call, otherwise false
517 * mmc_pre_req() is called in prior to mmc_start_req() to let
518 * host prepare for the new request. Preparation of a request may be
519 * performed while another request is running on the host.
521 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
524 if (host->ops->pre_req) {
525 mmc_host_clk_hold(host);
526 host->ops->pre_req(host, mrq, is_first_req);
527 mmc_host_clk_release(host);
532 * mmc_post_req - Post process a completed request
533 * @host: MMC host to post process command
534 * @mrq: MMC request to post process for
535 * @err: Error, if non zero, clean up any resources made in pre_req
537 * Let the host post process a completed request. Post processing of
538 * a request may be performed while another reuqest is running.
540 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
543 if (host->ops->post_req) {
544 mmc_host_clk_hold(host);
545 host->ops->post_req(host, mrq, err);
546 mmc_host_clk_release(host);
551 * mmc_start_req - start a non-blocking request
552 * @host: MMC host to start command
553 * @areq: async request to start
554 * @error: out parameter returns 0 for success, otherwise non zero
556 * Start a new MMC custom command request for a host.
557 * If there is on ongoing async request wait for completion
558 * of that request and start the new one and return.
559 * Does not wait for the new request to complete.
561 * Returns the completed request, NULL in case of none completed.
562 * Wait for the an ongoing request (previoulsy started) to complete and
563 * return the completed request. If there is no ongoing request, NULL
564 * is returned without waiting. NULL is not an error condition.
566 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
567 struct mmc_async_req *areq, int *error)
571 struct mmc_async_req *data = host->areq;
573 /* Prepare a new request */
575 mmc_pre_req(host, areq->mrq, !host->areq);
578 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
579 if (err == MMC_BLK_NEW_REQUEST) {
583 * The previous request was not completed,
589 * Check BKOPS urgency for each R1 response
591 if (host->card && mmc_card_mmc(host->card) &&
592 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
593 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
594 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT))
595 mmc_start_bkops(host->card, true);
599 start_err = __mmc_start_data_req(host, areq->mrq);
602 mmc_post_req(host, host->areq->mrq, 0);
604 /* Cancel a prepared request if it was not started. */
605 if ((err || start_err) && areq)
606 mmc_post_req(host, areq->mrq, -EINVAL);
617 EXPORT_SYMBOL(mmc_start_req);
620 * mmc_wait_for_req - start a request and wait for completion
621 * @host: MMC host to start command
622 * @mrq: MMC request to start
624 * Start a new MMC custom command request for a host, and wait
625 * for the command to complete. Does not attempt to parse the
628 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
630 __mmc_start_req(host, mrq);
631 mmc_wait_for_req_done(host, mrq);
633 EXPORT_SYMBOL(mmc_wait_for_req);
636 * mmc_interrupt_hpi - Issue for High priority Interrupt
637 * @card: the MMC card associated with the HPI transfer
639 * Issued High Priority Interrupt, and check for card status
640 * until out-of prg-state.
642 int mmc_interrupt_hpi(struct mmc_card *card)
646 unsigned long prg_wait;
650 if (!card->ext_csd.hpi_en) {
651 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
655 mmc_claim_host(card->host);
656 err = mmc_send_status(card, &status);
658 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
662 switch (R1_CURRENT_STATE(status)) {
668 * In idle and transfer states, HPI is not needed and the caller
669 * can issue the next intended command immediately
675 /* In all other states, it's illegal to issue HPI */
676 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
677 mmc_hostname(card->host), R1_CURRENT_STATE(status));
682 err = mmc_send_hpi_cmd(card, &status);
686 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
688 err = mmc_send_status(card, &status);
690 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
692 if (time_after(jiffies, prg_wait))
697 mmc_release_host(card->host);
700 EXPORT_SYMBOL(mmc_interrupt_hpi);
703 * mmc_wait_for_cmd - start a command and wait for completion
704 * @host: MMC host to start command
705 * @cmd: MMC command to start
706 * @retries: maximum number of retries
708 * Start a new MMC command for a host, and wait for the command
709 * to complete. Return any error that occurred while the command
710 * was executing. Do not attempt to parse the response.
712 int mmc_wait_for_cmd(struct mmc_host *host,
713 struct mmc_command *cmd,
716 struct mmc_request mrq = {NULL};
718 WARN_ON(!host->claimed);
720 memset(cmd->resp, 0, sizeof(cmd->resp));
721 cmd->retries = retries;
726 mmc_wait_for_req(host, &mrq);
730 EXPORT_SYMBOL(mmc_wait_for_cmd);
733 * mmc_stop_bkops - stop ongoing BKOPS
734 * @card: MMC card to check BKOPS
736 * Send HPI command to stop ongoing background operations to
737 * allow rapid servicing of foreground operations, e.g. read/
738 * writes. Wait until the card comes out of the programming state
739 * to avoid errors in servicing read/write requests.
741 int mmc_stop_bkops(struct mmc_card *card)
746 err = mmc_interrupt_hpi(card);
749 * If err is EINVAL, we can't issue an HPI.
750 * It should complete the BKOPS.
752 if (!err || (err == -EINVAL)) {
753 mmc_card_clr_doing_bkops(card);
759 EXPORT_SYMBOL(mmc_stop_bkops);
761 int mmc_read_bkops_status(struct mmc_card *card)
767 * In future work, we should consider storing the entire ext_csd.
769 ext_csd = kmalloc(512, GFP_KERNEL);
771 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
772 mmc_hostname(card->host));
776 mmc_claim_host(card->host);
777 err = mmc_send_ext_csd(card, ext_csd);
778 mmc_release_host(card->host);
782 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
783 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
788 EXPORT_SYMBOL(mmc_read_bkops_status);
791 * mmc_set_data_timeout - set the timeout for a data command
792 * @data: data phase for command
793 * @card: the MMC card associated with the data transfer
795 * Computes the data timeout parameters according to the
796 * correct algorithm given the card type.
798 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
803 * SDIO cards only define an upper 1 s limit on access.
805 if (mmc_card_sdio(card)) {
806 data->timeout_ns = 1000000000;
807 data->timeout_clks = 0;
812 * SD cards use a 100 multiplier rather than 10
814 mult = mmc_card_sd(card) ? 100 : 10;
817 * Scale up the multiplier (and therefore the timeout) by
818 * the r2w factor for writes.
820 if (data->flags & MMC_DATA_WRITE)
821 mult <<= card->csd.r2w_factor;
823 data->timeout_ns = card->csd.tacc_ns * mult;
824 data->timeout_clks = card->csd.tacc_clks * mult;
827 * SD cards also have an upper limit on the timeout.
829 if (mmc_card_sd(card)) {
830 unsigned int timeout_us, limit_us;
832 timeout_us = data->timeout_ns / 1000;
833 if (mmc_host_clk_rate(card->host))
834 timeout_us += data->timeout_clks * 1000 /
835 (mmc_host_clk_rate(card->host) / 1000);
837 if (data->flags & MMC_DATA_WRITE)
839 * The MMC spec "It is strongly recommended
840 * for hosts to implement more than 500ms
841 * timeout value even if the card indicates
842 * the 250ms maximum busy length." Even the
843 * previous value of 300ms is known to be
844 * insufficient for some cards.
851 * SDHC cards always use these fixed values.
853 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
854 data->timeout_ns = limit_us * 1000;
855 data->timeout_clks = 0;
860 * Some cards require longer data read timeout than indicated in CSD.
861 * Address this by setting the read timeout to a "reasonably high"
862 * value. For the cards tested, 300ms has proven enough. If necessary,
863 * this value can be increased if other problematic cards require this.
865 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
866 data->timeout_ns = 300000000;
867 data->timeout_clks = 0;
871 * Some cards need very high timeouts if driven in SPI mode.
872 * The worst observed timeout was 900ms after writing a
873 * continuous stream of data until the internal logic
876 if (mmc_host_is_spi(card->host)) {
877 if (data->flags & MMC_DATA_WRITE) {
878 if (data->timeout_ns < 1000000000)
879 data->timeout_ns = 1000000000; /* 1s */
881 if (data->timeout_ns < 100000000)
882 data->timeout_ns = 100000000; /* 100ms */
886 EXPORT_SYMBOL(mmc_set_data_timeout);
889 * mmc_align_data_size - pads a transfer size to a more optimal value
890 * @card: the MMC card associated with the data transfer
891 * @sz: original transfer size
893 * Pads the original data size with a number of extra bytes in
894 * order to avoid controller bugs and/or performance hits
895 * (e.g. some controllers revert to PIO for certain sizes).
897 * Returns the improved size, which might be unmodified.
899 * Note that this function is only relevant when issuing a
900 * single scatter gather entry.
902 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
905 * FIXME: We don't have a system for the controller to tell
906 * the core about its problems yet, so for now we just 32-bit
909 sz = ((sz + 3) / 4) * 4;
913 EXPORT_SYMBOL(mmc_align_data_size);
916 * __mmc_claim_host - exclusively claim a host
917 * @host: mmc host to claim
918 * @abort: whether or not the operation should be aborted
920 * Claim a host for a set of operations. If @abort is non null and
921 * dereference a non-zero value then this will return prematurely with
922 * that non-zero value without acquiring the lock. Returns zero
923 * with the lock held otherwise.
925 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
927 DECLARE_WAITQUEUE(wait, current);
933 add_wait_queue(&host->wq, &wait);
934 spin_lock_irqsave(&host->lock, flags);
936 set_current_state(TASK_UNINTERRUPTIBLE);
937 stop = abort ? atomic_read(abort) : 0;
938 if (stop || !host->claimed || host->claimer == current)
940 spin_unlock_irqrestore(&host->lock, flags);
942 spin_lock_irqsave(&host->lock, flags);
944 set_current_state(TASK_RUNNING);
947 host->claimer = current;
948 host->claim_cnt += 1;
953 spin_unlock_irqrestore(&host->lock, flags);
954 remove_wait_queue(&host->wq, &wait);
955 if (host->ops->enable && !stop && host->claim_cnt == 1)
956 host->ops->enable(host);
959 EXPORT_SYMBOL(__mmc_claim_host);
962 * mmc_release_host - release a host
963 * @host: mmc host to release
965 * Release a MMC host, allowing others to claim the host
966 * for their operations.
968 void mmc_release_host(struct mmc_host *host)
972 WARN_ON(!host->claimed);
974 if (host->ops->disable && host->claim_cnt == 1)
975 host->ops->disable(host);
977 spin_lock_irqsave(&host->lock, flags);
978 if (--host->claim_cnt) {
979 /* Release for nested claim */
980 spin_unlock_irqrestore(&host->lock, flags);
983 host->claimer = NULL;
984 spin_unlock_irqrestore(&host->lock, flags);
988 EXPORT_SYMBOL(mmc_release_host);
991 * This is a helper function, which fetches a runtime pm reference for the
992 * card device and also claims the host.
994 void mmc_get_card(struct mmc_card *card)
996 pm_runtime_get_sync(&card->dev);
997 mmc_claim_host(card->host);
999 EXPORT_SYMBOL(mmc_get_card);
1002 * This is a helper function, which releases the host and drops the runtime
1003 * pm reference for the card device.
1005 void mmc_put_card(struct mmc_card *card)
1007 mmc_release_host(card->host);
1008 pm_runtime_mark_last_busy(&card->dev);
1009 pm_runtime_put_autosuspend(&card->dev);
1011 EXPORT_SYMBOL(mmc_put_card);
1014 * Internal function that does the actual ios call to the host driver,
1015 * optionally printing some debug output.
1017 static inline void mmc_set_ios(struct mmc_host *host)
1019 struct mmc_ios *ios = &host->ios;
1021 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u timing %u\n",
1022 mmc_hostname(host), ios->clock, ios->bus_mode,
1023 ios->power_mode, ios->chip_select, ios->vdd,
1024 ios->bus_width, ios->timing);
1027 mmc_set_ungated(host);
1028 host->ops->set_ios(host, ios);
1032 * Control chip select pin on a host.
1034 void mmc_set_chip_select(struct mmc_host *host, int mode)
1036 mmc_host_clk_hold(host);
1037 host->ios.chip_select = mode;
1039 mmc_host_clk_release(host);
1043 * Sets the host clock to the highest possible frequency that
1046 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
1048 WARN_ON(hz < host->f_min);
1050 if (hz > host->f_max)
1053 host->ios.clock = hz;
1057 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1059 mmc_host_clk_hold(host);
1060 __mmc_set_clock(host, hz);
1061 mmc_host_clk_release(host);
1064 #ifdef CONFIG_MMC_CLKGATE
1066 * This gates the clock by setting it to 0 Hz.
1068 void mmc_gate_clock(struct mmc_host *host)
1070 unsigned long flags;
1072 spin_lock_irqsave(&host->clk_lock, flags);
1073 host->clk_old = host->ios.clock;
1074 host->ios.clock = 0;
1075 host->clk_gated = true;
1076 spin_unlock_irqrestore(&host->clk_lock, flags);
1081 * This restores the clock from gating by using the cached
1084 void mmc_ungate_clock(struct mmc_host *host)
1087 * We should previously have gated the clock, so the clock shall
1088 * be 0 here! The clock may however be 0 during initialization,
1089 * when some request operations are performed before setting
1090 * the frequency. When ungate is requested in that situation
1091 * we just ignore the call.
1093 if (host->clk_old) {
1094 BUG_ON(host->ios.clock);
1095 /* This call will also set host->clk_gated to false */
1096 __mmc_set_clock(host, host->clk_old);
1100 void mmc_set_ungated(struct mmc_host *host)
1102 unsigned long flags;
1105 * We've been given a new frequency while the clock is gated,
1106 * so make sure we regard this as ungating it.
1108 spin_lock_irqsave(&host->clk_lock, flags);
1109 host->clk_gated = false;
1110 spin_unlock_irqrestore(&host->clk_lock, flags);
1114 void mmc_set_ungated(struct mmc_host *host)
1120 * Change the bus mode (open drain/push-pull) of a host.
1122 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1124 mmc_host_clk_hold(host);
1125 host->ios.bus_mode = mode;
1127 mmc_host_clk_release(host);
1131 * Change data bus width of a host.
1133 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1135 mmc_host_clk_hold(host);
1136 host->ios.bus_width = width;
1138 mmc_host_clk_release(host);
1142 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1143 * @vdd: voltage (mV)
1144 * @low_bits: prefer low bits in boundary cases
1146 * This function returns the OCR bit number according to the provided @vdd
1147 * value. If conversion is not possible a negative errno value returned.
1149 * Depending on the @low_bits flag the function prefers low or high OCR bits
1150 * on boundary voltages. For example,
1151 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1152 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1154 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1156 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1158 const int max_bit = ilog2(MMC_VDD_35_36);
1161 if (vdd < 1650 || vdd > 3600)
1164 if (vdd >= 1650 && vdd <= 1950)
1165 return ilog2(MMC_VDD_165_195);
1170 /* Base 2000 mV, step 100 mV, bit's base 8. */
1171 bit = (vdd - 2000) / 100 + 8;
1178 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1179 * @vdd_min: minimum voltage value (mV)
1180 * @vdd_max: maximum voltage value (mV)
1182 * This function returns the OCR mask bits according to the provided @vdd_min
1183 * and @vdd_max values. If conversion is not possible the function returns 0.
1185 * Notes wrt boundary cases:
1186 * This function sets the OCR bits for all boundary voltages, for example
1187 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1188 * MMC_VDD_34_35 mask.
1190 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1194 if (vdd_max < vdd_min)
1197 /* Prefer high bits for the boundary vdd_max values. */
1198 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1202 /* Prefer low bits for the boundary vdd_min values. */
1203 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1207 /* Fill the mask, from max bit to min bit. */
1208 while (vdd_max >= vdd_min)
1209 mask |= 1 << vdd_max--;
1213 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1218 * mmc_of_parse_voltage - return mask of supported voltages
1219 * @np: The device node need to be parsed.
1220 * @mask: mask of voltages available for MMC/SD/SDIO
1222 * 1. Return zero on success.
1223 * 2. Return negative errno: voltage-range is invalid.
1225 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1227 const u32 *voltage_ranges;
1230 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1231 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1232 if (!voltage_ranges || !num_ranges) {
1233 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1237 for (i = 0; i < num_ranges; i++) {
1238 const int j = i * 2;
1241 ocr_mask = mmc_vddrange_to_ocrmask(
1242 be32_to_cpu(voltage_ranges[j]),
1243 be32_to_cpu(voltage_ranges[j + 1]));
1245 pr_err("%s: voltage-range #%d is invalid\n",
1254 EXPORT_SYMBOL(mmc_of_parse_voltage);
1256 #endif /* CONFIG_OF */
1258 #ifdef CONFIG_REGULATOR
1261 * mmc_regulator_get_ocrmask - return mask of supported voltages
1262 * @supply: regulator to use
1264 * This returns either a negative errno, or a mask of voltages that
1265 * can be provided to MMC/SD/SDIO devices using the specified voltage
1266 * regulator. This would normally be called before registering the
1269 int mmc_regulator_get_ocrmask(struct regulator *supply)
1275 count = regulator_count_voltages(supply);
1279 for (i = 0; i < count; i++) {
1283 vdd_uV = regulator_list_voltage(supply, i);
1287 vdd_mV = vdd_uV / 1000;
1288 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1293 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1296 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1297 * @mmc: the host to regulate
1298 * @supply: regulator to use
1299 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1301 * Returns zero on success, else negative errno.
1303 * MMC host drivers may use this to enable or disable a regulator using
1304 * a particular supply voltage. This would normally be called from the
1307 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1308 struct regulator *supply,
1309 unsigned short vdd_bit)
1319 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1320 * bits this regulator doesn't quite support ... don't
1321 * be too picky, most cards and regulators are OK with
1322 * a 0.1V range goof (it's a small error percentage).
1324 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1326 min_uV = 1650 * 1000;
1327 max_uV = 1950 * 1000;
1329 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1330 max_uV = min_uV + 100 * 1000;
1334 * If we're using a fixed/static regulator, don't call
1335 * regulator_set_voltage; it would fail.
1337 voltage = regulator_get_voltage(supply);
1339 if (!regulator_can_change_voltage(supply)) {
1346 else if (voltage < min_uV || voltage > max_uV)
1347 result = regulator_set_voltage(supply, min_uV, max_uV);
1351 if (result == 0 && !mmc->regulator_enabled) {
1352 result = regulator_enable(supply);
1354 mmc->regulator_enabled = true;
1356 } else if (mmc->regulator_enabled) {
1357 result = regulator_disable(supply);
1359 mmc->regulator_enabled = false;
1363 dev_err(mmc_dev(mmc),
1364 "could not set regulator OCR (%d)\n", result);
1367 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1369 int mmc_regulator_get_supply(struct mmc_host *mmc)
1371 struct device *dev = mmc_dev(mmc);
1372 struct regulator *supply;
1375 supply = devm_regulator_get(dev, "vmmc");
1376 mmc->supply.vmmc = supply;
1377 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1380 return PTR_ERR(supply);
1382 ret = mmc_regulator_get_ocrmask(supply);
1384 mmc->ocr_avail = ret;
1386 dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
1390 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1392 #endif /* CONFIG_REGULATOR */
1395 * Mask off any voltages we don't support and select
1396 * the lowest voltage
1398 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1403 * Sanity check the voltages that the card claims to
1407 dev_warn(mmc_dev(host),
1408 "card claims to support voltages below defined range\n");
1412 ocr &= host->ocr_avail;
1414 dev_warn(mmc_dev(host), "no support for card's volts\n");
1418 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1421 mmc_power_cycle(host, ocr);
1425 if (bit != host->ios.vdd)
1426 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1432 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1435 int old_signal_voltage = host->ios.signal_voltage;
1437 host->ios.signal_voltage = signal_voltage;
1438 if (host->ops->start_signal_voltage_switch) {
1439 mmc_host_clk_hold(host);
1440 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1441 mmc_host_clk_release(host);
1445 host->ios.signal_voltage = old_signal_voltage;
1450 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1452 struct mmc_command cmd = {0};
1459 * Send CMD11 only if the request is to switch the card to
1462 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1463 return __mmc_set_signal_voltage(host, signal_voltage);
1466 * If we cannot switch voltages, return failure so the caller
1467 * can continue without UHS mode
1469 if (!host->ops->start_signal_voltage_switch)
1471 if (!host->ops->card_busy)
1472 pr_warn("%s: cannot verify signal voltage switch\n",
1473 mmc_hostname(host));
1475 cmd.opcode = SD_SWITCH_VOLTAGE;
1477 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1479 err = mmc_wait_for_cmd(host, &cmd, 0);
1483 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1486 mmc_host_clk_hold(host);
1488 * The card should drive cmd and dat[0:3] low immediately
1489 * after the response of cmd11, but wait 1 ms to be sure
1492 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1497 * During a signal voltage level switch, the clock must be gated
1498 * for 5 ms according to the SD spec
1500 clock = host->ios.clock;
1501 host->ios.clock = 0;
1504 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1506 * Voltages may not have been switched, but we've already
1507 * sent CMD11, so a power cycle is required anyway
1513 /* Keep clock gated for at least 5 ms */
1515 host->ios.clock = clock;
1518 /* Wait for at least 1 ms according to spec */
1522 * Failure to switch is indicated by the card holding
1525 if (host->ops->card_busy && host->ops->card_busy(host))
1530 pr_debug("%s: Signal voltage switch failed, power cycling card\n",
1531 mmc_hostname(host));
1532 mmc_power_cycle(host, ocr);
1535 mmc_host_clk_release(host);
1541 * Select timing parameters for host.
1543 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1545 mmc_host_clk_hold(host);
1546 host->ios.timing = timing;
1548 mmc_host_clk_release(host);
1552 * Select appropriate driver type for host.
1554 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1556 mmc_host_clk_hold(host);
1557 host->ios.drv_type = drv_type;
1559 mmc_host_clk_release(host);
1563 * Apply power to the MMC stack. This is a two-stage process.
1564 * First, we enable power to the card without the clock running.
1565 * We then wait a bit for the power to stabilise. Finally,
1566 * enable the bus drivers and clock to the card.
1568 * We must _NOT_ enable the clock prior to power stablising.
1570 * If a host does all the power sequencing itself, ignore the
1571 * initial MMC_POWER_UP stage.
1573 void mmc_power_up(struct mmc_host *host, u32 ocr)
1575 if (host->ios.power_mode == MMC_POWER_ON)
1578 mmc_host_clk_hold(host);
1580 host->ios.vdd = fls(ocr) - 1;
1581 if (mmc_host_is_spi(host))
1582 host->ios.chip_select = MMC_CS_HIGH;
1584 host->ios.chip_select = MMC_CS_DONTCARE;
1585 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1586 host->ios.power_mode = MMC_POWER_UP;
1587 host->ios.bus_width = MMC_BUS_WIDTH_1;
1588 host->ios.timing = MMC_TIMING_LEGACY;
1591 /* Set signal voltage to 3.3V */
1592 __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1595 * This delay should be sufficient to allow the power supply
1596 * to reach the minimum voltage.
1600 host->ios.clock = host->f_init;
1602 host->ios.power_mode = MMC_POWER_ON;
1606 * This delay must be at least 74 clock sizes, or 1 ms, or the
1607 * time required to reach a stable voltage.
1611 mmc_host_clk_release(host);
1614 void mmc_power_off(struct mmc_host *host)
1616 if (host->ios.power_mode == MMC_POWER_OFF)
1619 mmc_host_clk_hold(host);
1621 host->ios.clock = 0;
1624 if (!mmc_host_is_spi(host)) {
1625 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1626 host->ios.chip_select = MMC_CS_DONTCARE;
1628 host->ios.power_mode = MMC_POWER_OFF;
1629 host->ios.bus_width = MMC_BUS_WIDTH_1;
1630 host->ios.timing = MMC_TIMING_LEGACY;
1634 * Some configurations, such as the 802.11 SDIO card in the OLPC
1635 * XO-1.5, require a short delay after poweroff before the card
1636 * can be successfully turned on again.
1640 mmc_host_clk_release(host);
1643 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1645 mmc_power_off(host);
1646 /* Wait at least 1 ms according to SD spec */
1648 mmc_power_up(host, ocr);
1652 * Cleanup when the last reference to the bus operator is dropped.
1654 static void __mmc_release_bus(struct mmc_host *host)
1657 BUG_ON(host->bus_refs);
1658 BUG_ON(!host->bus_dead);
1660 host->bus_ops = NULL;
1664 * Increase reference count of bus operator
1666 static inline void mmc_bus_get(struct mmc_host *host)
1668 unsigned long flags;
1670 spin_lock_irqsave(&host->lock, flags);
1672 spin_unlock_irqrestore(&host->lock, flags);
1676 * Decrease reference count of bus operator and free it if
1677 * it is the last reference.
1679 static inline void mmc_bus_put(struct mmc_host *host)
1681 unsigned long flags;
1683 spin_lock_irqsave(&host->lock, flags);
1685 if ((host->bus_refs == 0) && host->bus_ops)
1686 __mmc_release_bus(host);
1687 spin_unlock_irqrestore(&host->lock, flags);
1691 int mmc_resume_bus(struct mmc_host *host)
1693 unsigned long flags;
1695 if (!mmc_bus_needs_resume(host))
1698 printk("%s: Starting deferred resume\n", mmc_hostname(host));
1699 spin_lock_irqsave(&host->lock, flags);
1700 host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME;
1701 host->rescan_disable = 0;
1702 spin_unlock_irqrestore(&host->lock, flags);
1705 if (host->bus_ops && !host->bus_dead) {
1707 BUG_ON(!host->bus_ops->resume);
1708 host->bus_ops->resume(host);
1711 if (host->bus_ops->detect && !host->bus_dead)
1712 host->bus_ops->detect(host);
1715 printk("%s: Deferred resume completed\n", mmc_hostname(host));
1719 EXPORT_SYMBOL(mmc_resume_bus);
1723 * Assign a mmc bus handler to a host. Only one bus handler may control a
1724 * host at any given time.
1726 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1728 unsigned long flags;
1733 WARN_ON(!host->claimed);
1735 spin_lock_irqsave(&host->lock, flags);
1737 BUG_ON(host->bus_ops);
1738 BUG_ON(host->bus_refs);
1740 host->bus_ops = ops;
1744 spin_unlock_irqrestore(&host->lock, flags);
1748 * Remove the current bus handler from a host.
1750 void mmc_detach_bus(struct mmc_host *host)
1752 unsigned long flags;
1756 WARN_ON(!host->claimed);
1757 WARN_ON(!host->bus_ops);
1759 spin_lock_irqsave(&host->lock, flags);
1763 spin_unlock_irqrestore(&host->lock, flags);
1768 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1771 #ifdef CONFIG_MMC_DEBUG
1772 unsigned long flags;
1774 spin_lock_irqsave(&host->lock, flags);
1775 WARN_ON(host->removed);
1776 spin_unlock_irqrestore(&host->lock, flags);
1780 * If the device is configured as wakeup, we prevent a new sleep for
1781 * 5 s to give provision for user space to consume the event.
1783 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1784 device_can_wakeup(mmc_dev(host)))
1785 pm_wakeup_event(mmc_dev(host), 5000);
1787 host->detect_change = 1;
1788 mmc_schedule_delayed_work(&host->detect, delay);
1792 * mmc_detect_change - process change of state on a MMC socket
1793 * @host: host which changed state.
1794 * @delay: optional delay to wait before detection (jiffies)
1796 * MMC drivers should call this when they detect a card has been
1797 * inserted or removed. The MMC layer will confirm that any
1798 * present card is still functional, and initialize any newly
1801 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1803 _mmc_detect_change(host, delay, true);
1805 EXPORT_SYMBOL(mmc_detect_change);
1807 void mmc_init_erase(struct mmc_card *card)
1811 if (is_power_of_2(card->erase_size))
1812 card->erase_shift = ffs(card->erase_size) - 1;
1814 card->erase_shift = 0;
1817 * It is possible to erase an arbitrarily large area of an SD or MMC
1818 * card. That is not desirable because it can take a long time
1819 * (minutes) potentially delaying more important I/O, and also the
1820 * timeout calculations become increasingly hugely over-estimated.
1821 * Consequently, 'pref_erase' is defined as a guide to limit erases
1822 * to that size and alignment.
1824 * For SD cards that define Allocation Unit size, limit erases to one
1825 * Allocation Unit at a time. For MMC cards that define High Capacity
1826 * Erase Size, whether it is switched on or not, limit to that size.
1827 * Otherwise just have a stab at a good value. For modern cards it
1828 * will end up being 4MiB. Note that if the value is too small, it
1829 * can end up taking longer to erase.
1831 if (mmc_card_sd(card) && card->ssr.au) {
1832 card->pref_erase = card->ssr.au;
1833 card->erase_shift = ffs(card->ssr.au) - 1;
1834 } else if (card->ext_csd.hc_erase_size) {
1835 card->pref_erase = card->ext_csd.hc_erase_size;
1837 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1839 card->pref_erase = 512 * 1024 / 512;
1841 card->pref_erase = 1024 * 1024 / 512;
1843 card->pref_erase = 2 * 1024 * 1024 / 512;
1845 card->pref_erase = 4 * 1024 * 1024 / 512;
1846 if (card->pref_erase < card->erase_size) {
1847 card->pref_erase = card->erase_size;
1849 sz = card->pref_erase % card->erase_size;
1851 card->pref_erase += card->erase_size - sz;
1856 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1857 unsigned int arg, unsigned int qty)
1859 unsigned int erase_timeout;
1861 if (arg == MMC_DISCARD_ARG ||
1862 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1863 erase_timeout = card->ext_csd.trim_timeout;
1864 } else if (card->ext_csd.erase_group_def & 1) {
1865 /* High Capacity Erase Group Size uses HC timeouts */
1866 if (arg == MMC_TRIM_ARG)
1867 erase_timeout = card->ext_csd.trim_timeout;
1869 erase_timeout = card->ext_csd.hc_erase_timeout;
1871 /* CSD Erase Group Size uses write timeout */
1872 unsigned int mult = (10 << card->csd.r2w_factor);
1873 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1874 unsigned int timeout_us;
1876 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1877 if (card->csd.tacc_ns < 1000000)
1878 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1880 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1883 * ios.clock is only a target. The real clock rate might be
1884 * less but not that much less, so fudge it by multiplying by 2.
1887 timeout_us += (timeout_clks * 1000) /
1888 (mmc_host_clk_rate(card->host) / 1000);
1890 erase_timeout = timeout_us / 1000;
1893 * Theoretically, the calculation could underflow so round up
1894 * to 1ms in that case.
1900 /* Multiplier for secure operations */
1901 if (arg & MMC_SECURE_ARGS) {
1902 if (arg == MMC_SECURE_ERASE_ARG)
1903 erase_timeout *= card->ext_csd.sec_erase_mult;
1905 erase_timeout *= card->ext_csd.sec_trim_mult;
1908 erase_timeout *= qty;
1911 * Ensure at least a 1 second timeout for SPI as per
1912 * 'mmc_set_data_timeout()'
1914 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1915 erase_timeout = 1000;
1917 return erase_timeout;
1920 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1924 unsigned int erase_timeout;
1926 if (card->ssr.erase_timeout) {
1927 /* Erase timeout specified in SD Status Register (SSR) */
1928 erase_timeout = card->ssr.erase_timeout * qty +
1929 card->ssr.erase_offset;
1932 * Erase timeout not specified in SD Status Register (SSR) so
1933 * use 250ms per write block.
1935 erase_timeout = 250 * qty;
1938 /* Must not be less than 1 second */
1939 if (erase_timeout < 1000)
1940 erase_timeout = 1000;
1942 return erase_timeout;
1945 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1949 if (mmc_card_sd(card))
1950 return mmc_sd_erase_timeout(card, arg, qty);
1952 return mmc_mmc_erase_timeout(card, arg, qty);
1955 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1956 unsigned int to, unsigned int arg)
1958 struct mmc_command cmd = {0};
1959 unsigned int qty = 0;
1960 unsigned long timeout;
1961 unsigned int fr, nr;
1968 * qty is used to calculate the erase timeout which depends on how many
1969 * erase groups (or allocation units in SD terminology) are affected.
1970 * We count erasing part of an erase group as one erase group.
1971 * For SD, the allocation units are always a power of 2. For MMC, the
1972 * erase group size is almost certainly also power of 2, but it does not
1973 * seem to insist on that in the JEDEC standard, so we fall back to
1974 * division in that case. SD may not specify an allocation unit size,
1975 * in which case the timeout is based on the number of write blocks.
1977 * Note that the timeout for secure trim 2 will only be correct if the
1978 * number of erase groups specified is the same as the total of all
1979 * preceding secure trim 1 commands. Since the power may have been
1980 * lost since the secure trim 1 commands occurred, it is generally
1981 * impossible to calculate the secure trim 2 timeout correctly.
1983 if (card->erase_shift)
1984 qty += ((to >> card->erase_shift) -
1985 (from >> card->erase_shift)) + 1;
1986 else if (mmc_card_sd(card))
1987 qty += to - from + 1;
1989 qty += ((to / card->erase_size) -
1990 (from / card->erase_size)) + 1;
1992 if (!mmc_card_blockaddr(card)) {
1997 if (mmc_card_sd(card))
1998 cmd.opcode = SD_ERASE_WR_BLK_START;
2000 cmd.opcode = MMC_ERASE_GROUP_START;
2002 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2003 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2005 pr_err("mmc_erase: group start error %d, status %#x\n",
2011 memset(&cmd, 0, sizeof(struct mmc_command));
2012 if (mmc_card_sd(card))
2013 cmd.opcode = SD_ERASE_WR_BLK_END;
2015 cmd.opcode = MMC_ERASE_GROUP_END;
2017 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2018 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2020 pr_err("mmc_erase: group end error %d, status %#x\n",
2026 memset(&cmd, 0, sizeof(struct mmc_command));
2027 cmd.opcode = MMC_ERASE;
2029 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2030 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
2031 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2033 pr_err("mmc_erase: erase error %d, status %#x\n",
2039 if (mmc_host_is_spi(card->host))
2042 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2044 memset(&cmd, 0, sizeof(struct mmc_command));
2045 cmd.opcode = MMC_SEND_STATUS;
2046 cmd.arg = card->rca << 16;
2047 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2048 /* Do not retry else we can't see errors */
2049 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2050 if (err || (cmd.resp[0] & 0xFDF92000)) {
2051 pr_err("error %d requesting status %#x\n",
2057 /* Timeout if the device never becomes ready for data and
2058 * never leaves the program state.
2060 if (time_after(jiffies, timeout)) {
2061 pr_err("%s: Card stuck in programming state! %s\n",
2062 mmc_hostname(card->host), __func__);
2067 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2068 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2075 * mmc_erase - erase sectors.
2076 * @card: card to erase
2077 * @from: first sector to erase
2078 * @nr: number of sectors to erase
2079 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2081 * Caller must claim host before calling this function.
2083 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2086 unsigned int rem, to = from + nr;
2088 if (!(card->host->caps & MMC_CAP_ERASE) ||
2089 !(card->csd.cmdclass & CCC_ERASE))
2092 if (!card->erase_size)
2095 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2098 if ((arg & MMC_SECURE_ARGS) &&
2099 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2102 if ((arg & MMC_TRIM_ARGS) &&
2103 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2106 if (arg == MMC_SECURE_ERASE_ARG) {
2107 if (from % card->erase_size || nr % card->erase_size)
2111 if (arg == MMC_ERASE_ARG) {
2112 rem = from % card->erase_size;
2114 rem = card->erase_size - rem;
2121 rem = nr % card->erase_size;
2134 /* 'from' and 'to' are inclusive */
2137 return mmc_do_erase(card, from, to, arg);
2139 EXPORT_SYMBOL(mmc_erase);
2141 int mmc_can_erase(struct mmc_card *card)
2143 if ((card->host->caps & MMC_CAP_ERASE) &&
2144 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2148 EXPORT_SYMBOL(mmc_can_erase);
2150 int mmc_can_trim(struct mmc_card *card)
2152 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2153 !(card->quirks & MMC_QUIRK_TRIM_UNSTABLE))
2157 EXPORT_SYMBOL(mmc_can_trim);
2159 int mmc_can_discard(struct mmc_card *card)
2162 * As there's no way to detect the discard support bit at v4.5
2163 * use the s/w feature support filed.
2165 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2169 EXPORT_SYMBOL(mmc_can_discard);
2171 int mmc_can_sanitize(struct mmc_card *card)
2173 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2175 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2179 EXPORT_SYMBOL(mmc_can_sanitize);
2181 int mmc_can_secure_erase_trim(struct mmc_card *card)
2183 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
2187 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2189 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2192 if (!card->erase_size)
2194 if (from % card->erase_size || nr % card->erase_size)
2198 EXPORT_SYMBOL(mmc_erase_group_aligned);
2200 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2203 struct mmc_host *host = card->host;
2204 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2205 unsigned int last_timeout = 0;
2207 if (card->erase_shift)
2208 max_qty = UINT_MAX >> card->erase_shift;
2209 else if (mmc_card_sd(card))
2212 max_qty = UINT_MAX / card->erase_size;
2214 /* Find the largest qty with an OK timeout */
2217 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2218 timeout = mmc_erase_timeout(card, arg, qty + x);
2219 if (timeout > host->max_discard_to)
2221 if (timeout < last_timeout)
2223 last_timeout = timeout;
2235 /* Convert qty to sectors */
2236 if (card->erase_shift)
2237 max_discard = --qty << card->erase_shift;
2238 else if (mmc_card_sd(card))
2241 max_discard = --qty * card->erase_size;
2246 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2248 struct mmc_host *host = card->host;
2249 unsigned int max_discard, max_trim;
2251 if (!host->max_discard_to)
2255 * Without erase_group_def set, MMC erase timeout depends on clock
2256 * frequence which can change. In that case, the best choice is
2257 * just the preferred erase size.
2259 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2260 return card->pref_erase;
2262 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2263 if (mmc_can_trim(card)) {
2264 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2265 if (max_trim < max_discard)
2266 max_discard = max_trim;
2267 } else if (max_discard < card->erase_size) {
2270 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2271 mmc_hostname(host), max_discard, host->max_discard_to);
2274 EXPORT_SYMBOL(mmc_calc_max_discard);
2276 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2278 struct mmc_command cmd = {0};
2280 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
2283 cmd.opcode = MMC_SET_BLOCKLEN;
2285 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2286 return mmc_wait_for_cmd(card->host, &cmd, 5);
2288 EXPORT_SYMBOL(mmc_set_blocklen);
2290 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2293 struct mmc_command cmd = {0};
2295 cmd.opcode = MMC_SET_BLOCK_COUNT;
2296 cmd.arg = blockcount & 0x0000FFFF;
2299 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2300 return mmc_wait_for_cmd(card->host, &cmd, 5);
2302 EXPORT_SYMBOL(mmc_set_blockcount);
2304 static void mmc_hw_reset_for_init(struct mmc_host *host)
2306 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2308 mmc_host_clk_hold(host);
2309 host->ops->hw_reset(host);
2310 mmc_host_clk_release(host);
2313 int mmc_can_reset(struct mmc_card *card)
2317 if (!mmc_card_mmc(card))
2319 rst_n_function = card->ext_csd.rst_n_function;
2320 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2324 EXPORT_SYMBOL(mmc_can_reset);
2326 static int mmc_do_hw_reset(struct mmc_host *host, int check)
2328 struct mmc_card *card = host->card;
2330 if (!host->bus_ops->power_restore)
2333 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2339 if (!mmc_can_reset(card))
2342 mmc_host_clk_hold(host);
2343 mmc_set_clock(host, host->f_init);
2345 host->ops->hw_reset(host);
2347 /* If the reset has happened, then a status command will fail */
2349 struct mmc_command cmd = {0};
2352 cmd.opcode = MMC_SEND_STATUS;
2353 if (!mmc_host_is_spi(card->host))
2354 cmd.arg = card->rca << 16;
2355 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
2356 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2358 mmc_host_clk_release(host);
2363 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
2364 if (mmc_host_is_spi(host)) {
2365 host->ios.chip_select = MMC_CS_HIGH;
2366 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
2368 host->ios.chip_select = MMC_CS_DONTCARE;
2369 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
2371 host->ios.bus_width = MMC_BUS_WIDTH_1;
2372 host->ios.timing = MMC_TIMING_LEGACY;
2375 mmc_host_clk_release(host);
2377 return host->bus_ops->power_restore(host);
2380 int mmc_hw_reset(struct mmc_host *host)
2382 return mmc_do_hw_reset(host, 0);
2384 EXPORT_SYMBOL(mmc_hw_reset);
2386 int mmc_hw_reset_check(struct mmc_host *host)
2388 return mmc_do_hw_reset(host, 1);
2390 EXPORT_SYMBOL(mmc_hw_reset_check);
2392 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2394 host->f_init = freq;
2396 #ifdef CONFIG_MMC_DEBUG
2397 pr_info("%s: %s: trying to init card at %u Hz\n",
2398 mmc_hostname(host), __func__, host->f_init);
2400 mmc_power_up(host, host->ocr_avail);
2403 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2404 * do a hardware reset if possible.
2406 mmc_hw_reset_for_init(host);
2409 * sdio_reset sends CMD52 to reset card. Since we do not know
2410 * if the card is being re-initialized, just send it. CMD52
2411 * should be ignored by SD/eMMC cards.
2413 #ifdef MMC_STANDARD_PROBE
2417 mmc_send_if_cond(host, host->ocr_avail);
2419 /* Order's important: probe SDIO, then SD, then MMC */
2420 if (!mmc_attach_sdio(host))
2422 if (!mmc_attach_sd(host))
2424 if (!mmc_attach_mmc(host))
2428 * Simplifying initialization process.
2430 if (host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
2435 if (host->restrict_caps &
2436 (RESTRICT_CARD_TYPE_SDIO | RESTRICT_CARD_TYPE_SD))
2437 mmc_send_if_cond(host, host->ocr_avail);
2439 /* Order's important: probe SDIO, then SD, then MMC */
2440 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) &&
2441 !mmc_attach_sdio(host))
2443 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SD) &&
2444 !mmc_attach_sd(host))
2446 if ((host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) &&
2447 !mmc_attach_mmc(host))
2451 mmc_power_off(host);
2455 int _mmc_detect_card_removed(struct mmc_host *host)
2459 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
2462 if (!host->card || mmc_card_removed(host->card))
2465 ret = host->bus_ops->alive(host);
2468 * Card detect status and alive check may be out of sync if card is
2469 * removed slowly, when card detect switch changes while card/slot
2470 * pads are still contacted in hardware (refer to "SD Card Mechanical
2471 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2472 * detect work 200ms later for this case.
2474 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2475 mmc_detect_change(host, msecs_to_jiffies(200));
2476 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2480 mmc_card_set_removed(host->card);
2481 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2487 int mmc_detect_card_removed(struct mmc_host *host)
2489 struct mmc_card *card = host->card;
2492 WARN_ON(!host->claimed);
2497 ret = mmc_card_removed(card);
2499 * The card will be considered unchanged unless we have been asked to
2500 * detect a change or host requires polling to provide card detection.
2502 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2505 host->detect_change = 0;
2507 ret = _mmc_detect_card_removed(host);
2508 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2510 * Schedule a detect work as soon as possible to let a
2511 * rescan handle the card removal.
2513 cancel_delayed_work(&host->detect);
2514 _mmc_detect_change(host, 0, false);
2520 EXPORT_SYMBOL(mmc_detect_card_removed);
2522 void mmc_rescan(struct work_struct *work)
2524 struct mmc_host *host =
2525 container_of(work, struct mmc_host, detect.work);
2527 bool extend_wakelock = false;
2529 if (host->rescan_disable)
2532 /* If there is a non-removable card registered, only scan once */
2533 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2535 host->rescan_entered = 1;
2540 * if there is a _removable_ card registered, check whether it is
2543 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead &&
2544 !(host->caps & MMC_CAP_NONREMOVABLE))
2545 host->bus_ops->detect(host);
2547 host->detect_change = 0;
2549 /* If the card was removed the bus will be marked
2550 * as dead - extend the wakelock so userspace
2553 extend_wakelock = 1;
2556 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2557 * the card is no longer present.
2562 /* if there still is a card present, stop here */
2563 if (host->bus_ops != NULL) {
2569 * Only we can add a new handler, so it's safe to
2570 * release the lock here.
2574 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2575 host->ops->get_cd(host) == 0) {
2576 mmc_claim_host(host);
2577 mmc_power_off(host);
2578 mmc_release_host(host);
2582 mmc_claim_host(host);
2583 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2584 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
2585 extend_wakelock = true;
2588 if (freqs[i] <= host->f_min)
2591 mmc_release_host(host);
2594 if (extend_wakelock)
2595 wake_lock_timeout(&host->detect_wake_lock, HZ / 2);
2597 wake_unlock(&host->detect_wake_lock);
2598 if (host->caps & MMC_CAP_NEEDS_POLL) {
2599 wake_lock(&host->detect_wake_lock);
2600 mmc_schedule_delayed_work(&host->detect, HZ);
2604 void mmc_start_host(struct mmc_host *host)
2606 host->f_init = max(freqs[0], host->f_min);
2607 host->rescan_disable = 0;
2608 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2609 mmc_power_off(host);
2611 mmc_power_up(host, host->ocr_avail);
2612 _mmc_detect_change(host, 0, false);
2615 void mmc_stop_host(struct mmc_host *host)
2617 #ifdef CONFIG_MMC_DEBUG
2618 unsigned long flags;
2620 spin_lock_irqsave(&host->lock, flags);
2622 spin_unlock_irqrestore(&host->lock, flags);
2625 host->rescan_disable = 1;
2626 if (cancel_delayed_work_sync(&host->detect))
2627 wake_unlock(&host->detect_wake_lock);
2628 mmc_flush_scheduled_work();
2630 /* clear pm flags now and let card drivers set them as needed */
2634 if (host->bus_ops && !host->bus_dead) {
2635 /* Calling bus_ops->remove() with a claimed host can deadlock */
2636 host->bus_ops->remove(host);
2637 mmc_claim_host(host);
2638 mmc_detach_bus(host);
2639 mmc_power_off(host);
2640 mmc_release_host(host);
2648 mmc_power_off(host);
2651 int mmc_power_save_host(struct mmc_host *host)
2655 #ifdef CONFIG_MMC_DEBUG
2656 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2661 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2666 if (host->bus_ops->power_save)
2667 ret = host->bus_ops->power_save(host);
2671 mmc_power_off(host);
2675 EXPORT_SYMBOL(mmc_power_save_host);
2677 int mmc_power_restore_host(struct mmc_host *host)
2681 #ifdef CONFIG_MMC_DEBUG
2682 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2687 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2692 mmc_power_up(host, host->card->ocr);
2693 ret = host->bus_ops->power_restore(host);
2699 EXPORT_SYMBOL(mmc_power_restore_host);
2702 * Flush the cache to the non-volatile storage.
2704 int mmc_flush_cache(struct mmc_card *card)
2706 struct mmc_host *host = card->host;
2709 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2712 if (mmc_card_mmc(card) &&
2713 (card->ext_csd.cache_size > 0) &&
2714 (card->ext_csd.cache_ctrl & 1)) {
2715 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2716 EXT_CSD_FLUSH_CACHE, 1, 0);
2718 pr_err("%s: cache flush error %d\n",
2719 mmc_hostname(card->host), err);
2724 EXPORT_SYMBOL(mmc_flush_cache);
2727 * Turn the cache ON/OFF.
2728 * Turning the cache OFF shall trigger flushing of the data
2729 * to the non-volatile storage.
2730 * This function should be called with host claimed
2732 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2734 struct mmc_card *card = host->card;
2735 unsigned int timeout;
2738 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2739 mmc_card_is_removable(host))
2742 if (card && mmc_card_mmc(card) &&
2743 (card->ext_csd.cache_size > 0)) {
2746 if (card->ext_csd.cache_ctrl ^ enable) {
2747 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2748 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2749 EXT_CSD_CACHE_CTRL, enable, timeout);
2751 pr_err("%s: cache %s error %d\n",
2752 mmc_hostname(card->host),
2753 enable ? "on" : "off",
2756 card->ext_csd.cache_ctrl = enable;
2762 EXPORT_SYMBOL(mmc_cache_ctrl);
2766 /* Do the card removal on suspend if card is assumed removeable
2767 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2770 int mmc_pm_notify(struct notifier_block *notify_block,
2771 unsigned long mode, void *unused)
2773 struct mmc_host *host = container_of(
2774 notify_block, struct mmc_host, pm_notify);
2775 unsigned long flags;
2779 case PM_HIBERNATION_PREPARE:
2780 case PM_SUSPEND_PREPARE:
2781 spin_lock_irqsave(&host->lock, flags);
2782 if (mmc_bus_needs_resume(host)) {
2783 spin_unlock_irqrestore(&host->lock, flags);
2786 host->rescan_disable = 1;
2787 spin_unlock_irqrestore(&host->lock, flags);
2788 if (cancel_delayed_work_sync(&host->detect))
2789 wake_unlock(&host->detect_wake_lock);
2794 /* Validate prerequisites for suspend */
2795 if (host->bus_ops->pre_suspend)
2796 err = host->bus_ops->pre_suspend(host);
2797 if (!err && host->bus_ops->suspend)
2800 /* Calling bus_ops->remove() with a claimed host can deadlock */
2801 host->bus_ops->remove(host);
2802 mmc_claim_host(host);
2803 mmc_detach_bus(host);
2804 mmc_power_off(host);
2805 mmc_release_host(host);
2809 case PM_POST_SUSPEND:
2810 case PM_POST_HIBERNATION:
2811 case PM_POST_RESTORE:
2813 spin_lock_irqsave(&host->lock, flags);
2814 if (mmc_bus_manual_resume(host)) {
2815 spin_unlock_irqrestore(&host->lock, flags);
2818 host->rescan_disable = 0;
2819 spin_unlock_irqrestore(&host->lock, flags);
2820 _mmc_detect_change(host, 0, false);
2828 * mmc_init_context_info() - init synchronization context
2831 * Init struct context_info needed to implement asynchronous
2832 * request mechanism, used by mmc core, host driver and mmc requests
2835 void mmc_init_context_info(struct mmc_host *host)
2837 spin_lock_init(&host->context_info.lock);
2838 host->context_info.is_new_req = false;
2839 host->context_info.is_done_rcv = false;
2840 host->context_info.is_waiting_last_req = false;
2841 init_waitqueue_head(&host->context_info.wait);
2844 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2845 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2846 struct sdio_cis *cis,
2847 struct sdio_cccr *cccr,
2848 struct sdio_embedded_func *funcs,
2851 host->embedded_sdio_data.cis = cis;
2852 host->embedded_sdio_data.cccr = cccr;
2853 host->embedded_sdio_data.funcs = funcs;
2854 host->embedded_sdio_data.num_funcs = num_funcs;
2856 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2859 static int __init mmc_init(void)
2863 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2867 ret = mmc_register_bus();
2869 goto destroy_workqueue;
2871 ret = mmc_register_host_class();
2873 goto unregister_bus;
2875 ret = sdio_register_bus();
2877 goto unregister_host_class;
2881 unregister_host_class:
2882 mmc_unregister_host_class();
2884 mmc_unregister_bus();
2886 destroy_workqueue(workqueue);
2891 static void __exit mmc_exit(void)
2893 sdio_unregister_bus();
2894 mmc_unregister_host_class();
2895 mmc_unregister_bus();
2896 destroy_workqueue(workqueue);
2899 subsys_initcall(mmc_init);
2900 module_exit(mmc_exit);
2902 MODULE_LICENSE("GPL");