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/slot-gpio.h>
49 /* If the device is not responding */
50 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
53 * Background operations can take a long time, depending on the housekeeping
54 * operations the card has to perform.
56 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
58 static struct workqueue_struct *workqueue;
59 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
62 * Enabling software CRCs on the data blocks can be a significant (30%)
63 * performance cost, and for other reasons may not always be desired.
64 * So we allow it it to be disabled.
67 module_param(use_spi_crc, bool, 0);
70 * Internal function. Schedule delayed work in the MMC work queue.
72 static int mmc_schedule_delayed_work(struct delayed_work *work,
75 return queue_delayed_work(workqueue, work, delay);
79 * Internal function. Flush all scheduled work from the MMC work queue.
81 static void mmc_flush_scheduled_work(void)
83 flush_workqueue(workqueue);
86 #ifdef CONFIG_FAIL_MMC_REQUEST
89 * Internal function. Inject random data errors.
90 * If mmc_data is NULL no errors are injected.
92 static void mmc_should_fail_request(struct mmc_host *host,
93 struct mmc_request *mrq)
95 struct mmc_command *cmd = mrq->cmd;
96 struct mmc_data *data = mrq->data;
97 static const int data_errors[] = {
106 if (cmd->error || data->error ||
107 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
110 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
111 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
114 #else /* CONFIG_FAIL_MMC_REQUEST */
116 static inline void mmc_should_fail_request(struct mmc_host *host,
117 struct mmc_request *mrq)
121 #endif /* CONFIG_FAIL_MMC_REQUEST */
124 * mmc_request_done - finish processing an MMC request
125 * @host: MMC host which completed request
126 * @mrq: MMC request which request
128 * MMC drivers should call this function when they have completed
129 * their processing of a request.
131 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
133 struct mmc_command *cmd = mrq->cmd;
134 int err = cmd->error;
136 /* Flag re-tuning needed on CRC errors */
137 if (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
138 (mrq->data && mrq->data->error == -EILSEQ) ||
139 (mrq->stop && mrq->stop->error == -EILSEQ))
140 mmc_retune_needed(host);
142 if (err && cmd->retries && mmc_host_is_spi(host)) {
143 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
147 if (err && cmd->retries && !mmc_card_removed(host->card)) {
149 * Request starter must handle retries - see
150 * mmc_wait_for_req_done().
155 mmc_should_fail_request(host, mrq);
157 led_trigger_event(host->led, LED_OFF);
160 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
161 mmc_hostname(host), mrq->sbc->opcode,
163 mrq->sbc->resp[0], mrq->sbc->resp[1],
164 mrq->sbc->resp[2], mrq->sbc->resp[3]);
167 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
168 mmc_hostname(host), cmd->opcode, err,
169 cmd->resp[0], cmd->resp[1],
170 cmd->resp[2], cmd->resp[3]);
173 pr_debug("%s: %d bytes transferred: %d\n",
175 mrq->data->bytes_xfered, mrq->data->error);
179 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
180 mmc_hostname(host), mrq->stop->opcode,
182 mrq->stop->resp[0], mrq->stop->resp[1],
183 mrq->stop->resp[2], mrq->stop->resp[3]);
189 mmc_host_clk_release(host);
193 EXPORT_SYMBOL(mmc_request_done);
195 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
199 /* Assumes host controller has been runtime resumed by mmc_claim_host */
200 err = mmc_retune(host);
202 mrq->cmd->error = err;
203 mmc_request_done(host, mrq);
207 host->ops->request(host, mrq);
210 static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
212 #ifdef CONFIG_MMC_DEBUG
214 struct scatterlist *sg;
216 mmc_retune_hold(host);
218 if (mmc_card_removed(host->card))
222 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
223 mmc_hostname(host), mrq->sbc->opcode,
224 mrq->sbc->arg, mrq->sbc->flags);
227 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
228 mmc_hostname(host), mrq->cmd->opcode,
229 mrq->cmd->arg, mrq->cmd->flags);
232 pr_debug("%s: blksz %d blocks %d flags %08x "
233 "tsac %d ms nsac %d\n",
234 mmc_hostname(host), mrq->data->blksz,
235 mrq->data->blocks, mrq->data->flags,
236 mrq->data->timeout_ns / 1000000,
237 mrq->data->timeout_clks);
241 pr_debug("%s: CMD%u arg %08x flags %08x\n",
242 mmc_hostname(host), mrq->stop->opcode,
243 mrq->stop->arg, mrq->stop->flags);
246 WARN_ON(!host->claimed);
255 BUG_ON(mrq->data->blksz > host->max_blk_size);
256 BUG_ON(mrq->data->blocks > host->max_blk_count);
257 BUG_ON(mrq->data->blocks * mrq->data->blksz >
260 #ifdef CONFIG_MMC_DEBUG
262 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
264 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
267 mrq->cmd->data = mrq->data;
268 mrq->data->error = 0;
269 mrq->data->mrq = mrq;
271 mrq->data->stop = mrq->stop;
272 mrq->stop->error = 0;
273 mrq->stop->mrq = mrq;
276 mmc_host_clk_hold(host);
277 led_trigger_event(host->led, LED_FULL);
278 __mmc_start_request(host, mrq);
284 * mmc_start_bkops - start BKOPS for supported cards
285 * @card: MMC card to start BKOPS
286 * @form_exception: A flag to indicate if this function was
287 * called due to an exception raised by the card
289 * Start background operations whenever requested.
290 * When the urgent BKOPS bit is set in a R1 command response
291 * then background operations should be started immediately.
293 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
297 bool use_busy_signal;
301 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
304 err = mmc_read_bkops_status(card);
306 pr_err("%s: Failed to read bkops status: %d\n",
307 mmc_hostname(card->host), err);
311 if (!card->ext_csd.raw_bkops_status)
314 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
318 mmc_claim_host(card->host);
319 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
320 timeout = MMC_BKOPS_MAX_TIMEOUT;
321 use_busy_signal = true;
324 use_busy_signal = false;
327 mmc_retune_hold(card->host);
329 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
330 EXT_CSD_BKOPS_START, 1, timeout,
331 use_busy_signal, true, false);
333 pr_warn("%s: Error %d starting bkops\n",
334 mmc_hostname(card->host), err);
335 mmc_retune_release(card->host);
340 * For urgent bkops status (LEVEL_2 and more)
341 * bkops executed synchronously, otherwise
342 * the operation is in progress
344 if (!use_busy_signal)
345 mmc_card_set_doing_bkops(card);
347 mmc_retune_release(card->host);
349 mmc_release_host(card->host);
351 EXPORT_SYMBOL(mmc_start_bkops);
354 * mmc_wait_data_done() - done callback for data request
355 * @mrq: done data request
357 * Wakes up mmc context, passed as a callback to host controller driver
359 static void mmc_wait_data_done(struct mmc_request *mrq)
361 mrq->host->context_info.is_done_rcv = true;
362 wake_up_interruptible(&mrq->host->context_info.wait);
365 static void mmc_wait_done(struct mmc_request *mrq)
367 complete(&mrq->completion);
371 *__mmc_start_data_req() - starts data request
372 * @host: MMC host to start the request
373 * @mrq: data request to start
375 * Sets the done callback to be called when request is completed by the card.
376 * Starts data mmc request execution
378 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
382 mrq->done = mmc_wait_data_done;
385 err = mmc_start_request(host, mrq);
387 mrq->cmd->error = err;
388 mmc_wait_data_done(mrq);
394 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
398 init_completion(&mrq->completion);
399 mrq->done = mmc_wait_done;
401 err = mmc_start_request(host, mrq);
403 mrq->cmd->error = err;
404 complete(&mrq->completion);
411 * mmc_wait_for_data_req_done() - wait for request completed
412 * @host: MMC host to prepare the command.
413 * @mrq: MMC request to wait for
415 * Blocks MMC context till host controller will ack end of data request
416 * execution or new request notification arrives from the block layer.
417 * Handles command retries.
419 * Returns enum mmc_blk_status after checking errors.
421 static int mmc_wait_for_data_req_done(struct mmc_host *host,
422 struct mmc_request *mrq,
423 struct mmc_async_req *next_req)
425 struct mmc_command *cmd;
426 struct mmc_context_info *context_info = &host->context_info;
431 wait_event_interruptible(context_info->wait,
432 (context_info->is_done_rcv ||
433 context_info->is_new_req));
434 spin_lock_irqsave(&context_info->lock, flags);
435 context_info->is_waiting_last_req = false;
436 spin_unlock_irqrestore(&context_info->lock, flags);
437 if (context_info->is_done_rcv) {
438 context_info->is_done_rcv = false;
439 context_info->is_new_req = false;
442 if (!cmd->error || !cmd->retries ||
443 mmc_card_removed(host->card)) {
444 err = host->areq->err_check(host->card,
446 break; /* return err */
448 mmc_retune_recheck(host);
449 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
451 cmd->opcode, cmd->error);
454 __mmc_start_request(host, mrq);
455 continue; /* wait for done/new event again */
457 } else if (context_info->is_new_req) {
458 context_info->is_new_req = false;
460 return MMC_BLK_NEW_REQUEST;
463 mmc_retune_release(host);
467 static void mmc_wait_for_req_done(struct mmc_host *host,
468 struct mmc_request *mrq)
470 struct mmc_command *cmd;
473 wait_for_completion(&mrq->completion);
478 * If host has timed out waiting for the sanitize
479 * to complete, card might be still in programming state
480 * so let's try to bring the card out of programming
483 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
484 if (!mmc_interrupt_hpi(host->card)) {
485 pr_warn("%s: %s: Interrupted sanitize\n",
486 mmc_hostname(host), __func__);
490 pr_err("%s: %s: Failed to interrupt sanitize\n",
491 mmc_hostname(host), __func__);
494 if (!cmd->error || !cmd->retries ||
495 mmc_card_removed(host->card))
498 mmc_retune_recheck(host);
500 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
501 mmc_hostname(host), cmd->opcode, cmd->error);
504 __mmc_start_request(host, mrq);
507 mmc_retune_release(host);
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)) {
596 /* Cancel the prepared request */
598 mmc_post_req(host, areq->mrq, -EINVAL);
600 mmc_start_bkops(host->card, true);
602 /* prepare the request again */
604 mmc_pre_req(host, areq->mrq, !host->areq);
609 start_err = __mmc_start_data_req(host, areq->mrq);
612 mmc_post_req(host, host->areq->mrq, 0);
614 /* Cancel a prepared request if it was not started. */
615 if ((err || start_err) && areq)
616 mmc_post_req(host, areq->mrq, -EINVAL);
627 EXPORT_SYMBOL(mmc_start_req);
630 * mmc_wait_for_req - start a request and wait for completion
631 * @host: MMC host to start command
632 * @mrq: MMC request to start
634 * Start a new MMC custom command request for a host, and wait
635 * for the command to complete. Does not attempt to parse the
638 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
640 __mmc_start_req(host, mrq);
641 mmc_wait_for_req_done(host, mrq);
643 EXPORT_SYMBOL(mmc_wait_for_req);
646 * mmc_interrupt_hpi - Issue for High priority Interrupt
647 * @card: the MMC card associated with the HPI transfer
649 * Issued High Priority Interrupt, and check for card status
650 * until out-of prg-state.
652 int mmc_interrupt_hpi(struct mmc_card *card)
656 unsigned long prg_wait;
660 if (!card->ext_csd.hpi_en) {
661 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
665 mmc_claim_host(card->host);
666 err = mmc_send_status(card, &status);
668 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
672 switch (R1_CURRENT_STATE(status)) {
678 * In idle and transfer states, HPI is not needed and the caller
679 * can issue the next intended command immediately
685 /* In all other states, it's illegal to issue HPI */
686 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
687 mmc_hostname(card->host), R1_CURRENT_STATE(status));
692 err = mmc_send_hpi_cmd(card, &status);
696 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
698 err = mmc_send_status(card, &status);
700 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
702 if (time_after(jiffies, prg_wait))
707 mmc_release_host(card->host);
710 EXPORT_SYMBOL(mmc_interrupt_hpi);
713 * mmc_wait_for_cmd - start a command and wait for completion
714 * @host: MMC host to start command
715 * @cmd: MMC command to start
716 * @retries: maximum number of retries
718 * Start a new MMC command for a host, and wait for the command
719 * to complete. Return any error that occurred while the command
720 * was executing. Do not attempt to parse the response.
722 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
724 struct mmc_request mrq = {NULL};
726 WARN_ON(!host->claimed);
728 memset(cmd->resp, 0, sizeof(cmd->resp));
729 cmd->retries = retries;
734 mmc_wait_for_req(host, &mrq);
739 EXPORT_SYMBOL(mmc_wait_for_cmd);
742 * mmc_stop_bkops - stop ongoing BKOPS
743 * @card: MMC card to check BKOPS
745 * Send HPI command to stop ongoing background operations to
746 * allow rapid servicing of foreground operations, e.g. read/
747 * writes. Wait until the card comes out of the programming state
748 * to avoid errors in servicing read/write requests.
750 int mmc_stop_bkops(struct mmc_card *card)
755 err = mmc_interrupt_hpi(card);
758 * If err is EINVAL, we can't issue an HPI.
759 * It should complete the BKOPS.
761 if (!err || (err == -EINVAL)) {
762 mmc_card_clr_doing_bkops(card);
763 mmc_retune_release(card->host);
769 EXPORT_SYMBOL(mmc_stop_bkops);
771 int mmc_read_bkops_status(struct mmc_card *card)
776 mmc_claim_host(card->host);
777 err = mmc_get_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];
787 EXPORT_SYMBOL(mmc_read_bkops_status);
790 * mmc_set_data_timeout - set the timeout for a data command
791 * @data: data phase for command
792 * @card: the MMC card associated with the data transfer
794 * Computes the data timeout parameters according to the
795 * correct algorithm given the card type.
797 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
802 * SDIO cards only define an upper 1 s limit on access.
804 if (mmc_card_sdio(card)) {
805 data->timeout_ns = 1000000000;
806 data->timeout_clks = 0;
811 * SD cards use a 100 multiplier rather than 10
813 mult = mmc_card_sd(card) ? 100 : 10;
816 * Scale up the multiplier (and therefore the timeout) by
817 * the r2w factor for writes.
819 if (data->flags & MMC_DATA_WRITE)
820 mult <<= card->csd.r2w_factor;
822 data->timeout_ns = card->csd.tacc_ns * mult;
823 data->timeout_clks = card->csd.tacc_clks * mult;
826 * SD cards also have an upper limit on the timeout.
828 if (mmc_card_sd(card)) {
829 unsigned int timeout_us, limit_us;
831 timeout_us = data->timeout_ns / 1000;
832 if (mmc_host_clk_rate(card->host))
833 timeout_us += data->timeout_clks * 1000 /
834 (mmc_host_clk_rate(card->host) / 1000);
836 if (data->flags & MMC_DATA_WRITE)
838 * The MMC spec "It is strongly recommended
839 * for hosts to implement more than 500ms
840 * timeout value even if the card indicates
841 * the 250ms maximum busy length." Even the
842 * previous value of 300ms is known to be
843 * insufficient for some cards.
850 * SDHC cards always use these fixed values.
852 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
853 data->timeout_ns = limit_us * 1000;
854 data->timeout_clks = 0;
857 /* assign limit value if invalid */
859 data->timeout_ns = limit_us * 1000;
863 * Some cards require longer data read timeout than indicated in CSD.
864 * Address this by setting the read timeout to a "reasonably high"
865 * value. For the cards tested, 300ms has proven enough. If necessary,
866 * this value can be increased if other problematic cards require this.
868 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
869 data->timeout_ns = 300000000;
870 data->timeout_clks = 0;
874 * Some cards need very high timeouts if driven in SPI mode.
875 * The worst observed timeout was 900ms after writing a
876 * continuous stream of data until the internal logic
879 if (mmc_host_is_spi(card->host)) {
880 if (data->flags & MMC_DATA_WRITE) {
881 if (data->timeout_ns < 1000000000)
882 data->timeout_ns = 1000000000; /* 1s */
884 if (data->timeout_ns < 100000000)
885 data->timeout_ns = 100000000; /* 100ms */
889 EXPORT_SYMBOL(mmc_set_data_timeout);
892 * mmc_align_data_size - pads a transfer size to a more optimal value
893 * @card: the MMC card associated with the data transfer
894 * @sz: original transfer size
896 * Pads the original data size with a number of extra bytes in
897 * order to avoid controller bugs and/or performance hits
898 * (e.g. some controllers revert to PIO for certain sizes).
900 * Returns the improved size, which might be unmodified.
902 * Note that this function is only relevant when issuing a
903 * single scatter gather entry.
905 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
908 * FIXME: We don't have a system for the controller to tell
909 * the core about its problems yet, so for now we just 32-bit
912 sz = ((sz + 3) / 4) * 4;
916 EXPORT_SYMBOL(mmc_align_data_size);
919 * __mmc_claim_host - exclusively claim a host
920 * @host: mmc host to claim
921 * @abort: whether or not the operation should be aborted
923 * Claim a host for a set of operations. If @abort is non null and
924 * dereference a non-zero value then this will return prematurely with
925 * that non-zero value without acquiring the lock. Returns zero
926 * with the lock held otherwise.
928 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
930 DECLARE_WAITQUEUE(wait, current);
937 add_wait_queue(&host->wq, &wait);
938 spin_lock_irqsave(&host->lock, flags);
940 set_current_state(TASK_UNINTERRUPTIBLE);
941 stop = abort ? atomic_read(abort) : 0;
942 if (stop || !host->claimed || host->claimer == current)
944 spin_unlock_irqrestore(&host->lock, flags);
946 spin_lock_irqsave(&host->lock, flags);
948 set_current_state(TASK_RUNNING);
951 host->claimer = current;
952 host->claim_cnt += 1;
953 if (host->claim_cnt == 1)
957 spin_unlock_irqrestore(&host->lock, flags);
958 remove_wait_queue(&host->wq, &wait);
961 pm_runtime_get_sync(mmc_dev(host));
965 EXPORT_SYMBOL(__mmc_claim_host);
968 * mmc_release_host - release a host
969 * @host: mmc host to release
971 * Release a MMC host, allowing others to claim the host
972 * for their operations.
974 void mmc_release_host(struct mmc_host *host)
978 WARN_ON(!host->claimed);
980 spin_lock_irqsave(&host->lock, flags);
981 if (--host->claim_cnt) {
982 /* Release for nested claim */
983 spin_unlock_irqrestore(&host->lock, flags);
986 host->claimer = NULL;
987 spin_unlock_irqrestore(&host->lock, flags);
989 pm_runtime_mark_last_busy(mmc_dev(host));
990 pm_runtime_put_autosuspend(mmc_dev(host));
993 EXPORT_SYMBOL(mmc_release_host);
996 * This is a helper function, which fetches a runtime pm reference for the
997 * card device and also claims the host.
999 void mmc_get_card(struct mmc_card *card)
1001 pm_runtime_get_sync(&card->dev);
1002 mmc_claim_host(card->host);
1004 EXPORT_SYMBOL(mmc_get_card);
1007 * This is a helper function, which releases the host and drops the runtime
1008 * pm reference for the card device.
1010 void mmc_put_card(struct mmc_card *card)
1012 mmc_release_host(card->host);
1013 pm_runtime_mark_last_busy(&card->dev);
1014 pm_runtime_put_autosuspend(&card->dev);
1016 EXPORT_SYMBOL(mmc_put_card);
1019 * Internal function that does the actual ios call to the host driver,
1020 * optionally printing some debug output.
1022 static inline void mmc_set_ios(struct mmc_host *host)
1024 struct mmc_ios *ios = &host->ios;
1026 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1027 "width %u timing %u\n",
1028 mmc_hostname(host), ios->clock, ios->bus_mode,
1029 ios->power_mode, ios->chip_select, ios->vdd,
1030 ios->bus_width, ios->timing);
1033 mmc_set_ungated(host);
1034 host->ops->set_ios(host, ios);
1038 * Control chip select pin on a host.
1040 void mmc_set_chip_select(struct mmc_host *host, int mode)
1042 mmc_host_clk_hold(host);
1043 host->ios.chip_select = mode;
1045 mmc_host_clk_release(host);
1049 * Sets the host clock to the highest possible frequency that
1052 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
1054 WARN_ON(hz && hz < host->f_min);
1056 if (hz > host->f_max)
1059 host->ios.clock = hz;
1063 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1065 mmc_host_clk_hold(host);
1066 __mmc_set_clock(host, hz);
1067 mmc_host_clk_release(host);
1070 #ifdef CONFIG_MMC_CLKGATE
1072 * This gates the clock by setting it to 0 Hz.
1074 void mmc_gate_clock(struct mmc_host *host)
1076 unsigned long flags;
1078 spin_lock_irqsave(&host->clk_lock, flags);
1079 host->clk_old = host->ios.clock;
1080 host->ios.clock = 0;
1081 host->clk_gated = true;
1082 spin_unlock_irqrestore(&host->clk_lock, flags);
1087 * This restores the clock from gating by using the cached
1090 void mmc_ungate_clock(struct mmc_host *host)
1093 * We should previously have gated the clock, so the clock shall
1094 * be 0 here! The clock may however be 0 during initialization,
1095 * when some request operations are performed before setting
1096 * the frequency. When ungate is requested in that situation
1097 * we just ignore the call.
1099 if (host->clk_old) {
1100 BUG_ON(host->ios.clock);
1101 /* This call will also set host->clk_gated to false */
1102 __mmc_set_clock(host, host->clk_old);
1106 void mmc_set_ungated(struct mmc_host *host)
1108 unsigned long flags;
1111 * We've been given a new frequency while the clock is gated,
1112 * so make sure we regard this as ungating it.
1114 spin_lock_irqsave(&host->clk_lock, flags);
1115 host->clk_gated = false;
1116 spin_unlock_irqrestore(&host->clk_lock, flags);
1120 void mmc_set_ungated(struct mmc_host *host)
1125 int mmc_execute_tuning(struct mmc_card *card)
1127 struct mmc_host *host = card->host;
1131 if (!host->ops->execute_tuning)
1134 if (mmc_card_mmc(card))
1135 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1137 opcode = MMC_SEND_TUNING_BLOCK;
1139 mmc_host_clk_hold(host);
1140 err = host->ops->execute_tuning(host, opcode);
1141 mmc_host_clk_release(host);
1144 pr_err("%s: tuning execution failed\n", mmc_hostname(host));
1146 mmc_retune_enable(host);
1152 * Change the bus mode (open drain/push-pull) of a host.
1154 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1156 mmc_host_clk_hold(host);
1157 host->ios.bus_mode = mode;
1159 mmc_host_clk_release(host);
1163 * Change data bus width of a host.
1165 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1167 mmc_host_clk_hold(host);
1168 host->ios.bus_width = width;
1170 mmc_host_clk_release(host);
1174 * Set initial state after a power cycle or a hw_reset.
1176 void mmc_set_initial_state(struct mmc_host *host)
1178 mmc_retune_disable(host);
1180 if (mmc_host_is_spi(host))
1181 host->ios.chip_select = MMC_CS_HIGH;
1183 host->ios.chip_select = MMC_CS_DONTCARE;
1184 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1185 host->ios.bus_width = MMC_BUS_WIDTH_1;
1186 host->ios.timing = MMC_TIMING_LEGACY;
1187 host->ios.drv_type = 0;
1193 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1194 * @vdd: voltage (mV)
1195 * @low_bits: prefer low bits in boundary cases
1197 * This function returns the OCR bit number according to the provided @vdd
1198 * value. If conversion is not possible a negative errno value returned.
1200 * Depending on the @low_bits flag the function prefers low or high OCR bits
1201 * on boundary voltages. For example,
1202 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1203 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1205 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1207 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1209 const int max_bit = ilog2(MMC_VDD_35_36);
1212 if (vdd < 1650 || vdd > 3600)
1215 if (vdd >= 1650 && vdd <= 1950)
1216 return ilog2(MMC_VDD_165_195);
1221 /* Base 2000 mV, step 100 mV, bit's base 8. */
1222 bit = (vdd - 2000) / 100 + 8;
1229 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1230 * @vdd_min: minimum voltage value (mV)
1231 * @vdd_max: maximum voltage value (mV)
1233 * This function returns the OCR mask bits according to the provided @vdd_min
1234 * and @vdd_max values. If conversion is not possible the function returns 0.
1236 * Notes wrt boundary cases:
1237 * This function sets the OCR bits for all boundary voltages, for example
1238 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1239 * MMC_VDD_34_35 mask.
1241 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1245 if (vdd_max < vdd_min)
1248 /* Prefer high bits for the boundary vdd_max values. */
1249 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1253 /* Prefer low bits for the boundary vdd_min values. */
1254 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1258 /* Fill the mask, from max bit to min bit. */
1259 while (vdd_max >= vdd_min)
1260 mask |= 1 << vdd_max--;
1264 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1269 * mmc_of_parse_voltage - return mask of supported voltages
1270 * @np: The device node need to be parsed.
1271 * @mask: mask of voltages available for MMC/SD/SDIO
1273 * 1. Return zero on success.
1274 * 2. Return negative errno: voltage-range is invalid.
1276 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1278 const u32 *voltage_ranges;
1281 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1282 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1283 if (!voltage_ranges || !num_ranges) {
1284 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1288 for (i = 0; i < num_ranges; i++) {
1289 const int j = i * 2;
1292 ocr_mask = mmc_vddrange_to_ocrmask(
1293 be32_to_cpu(voltage_ranges[j]),
1294 be32_to_cpu(voltage_ranges[j + 1]));
1296 pr_err("%s: voltage-range #%d is invalid\n",
1305 EXPORT_SYMBOL(mmc_of_parse_voltage);
1307 #endif /* CONFIG_OF */
1309 static int mmc_of_get_func_num(struct device_node *node)
1314 ret = of_property_read_u32(node, "reg", ®);
1321 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1324 struct device_node *node;
1326 if (!host->parent || !host->parent->of_node)
1329 for_each_child_of_node(host->parent->of_node, node) {
1330 if (mmc_of_get_func_num(node) == func_num)
1337 #ifdef CONFIG_REGULATOR
1340 * mmc_regulator_get_ocrmask - return mask of supported voltages
1341 * @supply: regulator to use
1343 * This returns either a negative errno, or a mask of voltages that
1344 * can be provided to MMC/SD/SDIO devices using the specified voltage
1345 * regulator. This would normally be called before registering the
1348 int mmc_regulator_get_ocrmask(struct regulator *supply)
1356 count = regulator_count_voltages(supply);
1360 for (i = 0; i < count; i++) {
1361 vdd_uV = regulator_list_voltage(supply, i);
1365 vdd_mV = vdd_uV / 1000;
1366 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1370 vdd_uV = regulator_get_voltage(supply);
1374 vdd_mV = vdd_uV / 1000;
1375 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1380 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1383 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1384 * @mmc: the host to regulate
1385 * @supply: regulator to use
1386 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1388 * Returns zero on success, else negative errno.
1390 * MMC host drivers may use this to enable or disable a regulator using
1391 * a particular supply voltage. This would normally be called from the
1394 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1395 struct regulator *supply,
1396 unsigned short vdd_bit)
1405 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1406 * bits this regulator doesn't quite support ... don't
1407 * be too picky, most cards and regulators are OK with
1408 * a 0.1V range goof (it's a small error percentage).
1410 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1412 min_uV = 1650 * 1000;
1413 max_uV = 1950 * 1000;
1415 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1416 max_uV = min_uV + 100 * 1000;
1419 result = regulator_set_voltage(supply, min_uV, max_uV);
1420 if (result == 0 && !mmc->regulator_enabled) {
1421 result = regulator_enable(supply);
1423 mmc->regulator_enabled = true;
1425 } else if (mmc->regulator_enabled) {
1426 result = regulator_disable(supply);
1428 mmc->regulator_enabled = false;
1432 dev_err(mmc_dev(mmc),
1433 "could not set regulator OCR (%d)\n", result);
1436 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1438 #endif /* CONFIG_REGULATOR */
1440 int mmc_regulator_get_supply(struct mmc_host *mmc)
1442 struct device *dev = mmc_dev(mmc);
1445 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1446 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1448 if (IS_ERR(mmc->supply.vmmc)) {
1449 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1450 return -EPROBE_DEFER;
1451 dev_info(dev, "No vmmc regulator found\n");
1453 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1455 mmc->ocr_avail = ret;
1457 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1460 if (IS_ERR(mmc->supply.vqmmc)) {
1461 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1462 return -EPROBE_DEFER;
1463 dev_info(dev, "No vqmmc regulator found\n");
1468 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1471 * Mask off any voltages we don't support and select
1472 * the lowest voltage
1474 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1479 * Sanity check the voltages that the card claims to
1483 dev_warn(mmc_dev(host),
1484 "card claims to support voltages below defined range\n");
1488 ocr &= host->ocr_avail;
1490 dev_warn(mmc_dev(host), "no support for card's volts\n");
1494 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1497 mmc_power_cycle(host, ocr);
1501 if (bit != host->ios.vdd)
1502 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1508 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1511 int old_signal_voltage = host->ios.signal_voltage;
1513 host->ios.signal_voltage = signal_voltage;
1514 if (host->ops->start_signal_voltage_switch) {
1515 mmc_host_clk_hold(host);
1516 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1517 mmc_host_clk_release(host);
1521 host->ios.signal_voltage = old_signal_voltage;
1527 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1529 struct mmc_command cmd = {0};
1536 * Send CMD11 only if the request is to switch the card to
1539 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1540 return __mmc_set_signal_voltage(host, signal_voltage);
1543 * If we cannot switch voltages, return failure so the caller
1544 * can continue without UHS mode
1546 if (!host->ops->start_signal_voltage_switch)
1548 if (!host->ops->card_busy)
1549 pr_warn("%s: cannot verify signal voltage switch\n",
1550 mmc_hostname(host));
1552 mmc_host_clk_hold(host);
1554 cmd.opcode = SD_SWITCH_VOLTAGE;
1556 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1558 err = mmc_wait_for_cmd(host, &cmd, 0);
1562 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) {
1567 * The card should drive cmd and dat[0:3] low immediately
1568 * after the response of cmd11, but wait 1 ms to be sure
1571 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1576 * During a signal voltage level switch, the clock must be gated
1577 * for 5 ms according to the SD spec
1579 clock = host->ios.clock;
1580 host->ios.clock = 0;
1583 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1585 * Voltages may not have been switched, but we've already
1586 * sent CMD11, so a power cycle is required anyway
1592 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1594 host->ios.clock = clock;
1597 /* Wait for at least 1 ms according to spec */
1601 * Failure to switch is indicated by the card holding
1604 if (host->ops->card_busy && host->ops->card_busy(host))
1609 pr_debug("%s: Signal voltage switch failed, "
1610 "power cycling card\n", mmc_hostname(host));
1611 mmc_power_cycle(host, ocr);
1615 mmc_host_clk_release(host);
1621 * Select timing parameters for host.
1623 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1625 mmc_host_clk_hold(host);
1626 host->ios.timing = timing;
1628 mmc_host_clk_release(host);
1632 * Select appropriate driver type for host.
1634 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1636 mmc_host_clk_hold(host);
1637 host->ios.drv_type = drv_type;
1639 mmc_host_clk_release(host);
1642 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1643 int card_drv_type, int *drv_type)
1645 struct mmc_host *host = card->host;
1646 int host_drv_type = SD_DRIVER_TYPE_B;
1651 if (!host->ops->select_drive_strength)
1654 /* Use SD definition of driver strength for hosts */
1655 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1656 host_drv_type |= SD_DRIVER_TYPE_A;
1658 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1659 host_drv_type |= SD_DRIVER_TYPE_C;
1661 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1662 host_drv_type |= SD_DRIVER_TYPE_D;
1665 * The drive strength that the hardware can support
1666 * depends on the board design. Pass the appropriate
1667 * information and let the hardware specific code
1668 * return what is possible given the options
1670 mmc_host_clk_hold(host);
1671 drive_strength = host->ops->select_drive_strength(card, max_dtr,
1675 mmc_host_clk_release(host);
1677 return drive_strength;
1681 * Apply power to the MMC stack. This is a two-stage process.
1682 * First, we enable power to the card without the clock running.
1683 * We then wait a bit for the power to stabilise. Finally,
1684 * enable the bus drivers and clock to the card.
1686 * We must _NOT_ enable the clock prior to power stablising.
1688 * If a host does all the power sequencing itself, ignore the
1689 * initial MMC_POWER_UP stage.
1691 void mmc_power_up(struct mmc_host *host, u32 ocr)
1693 if (host->ios.power_mode == MMC_POWER_ON)
1696 mmc_host_clk_hold(host);
1698 mmc_pwrseq_pre_power_on(host);
1700 host->ios.vdd = fls(ocr) - 1;
1701 host->ios.power_mode = MMC_POWER_UP;
1702 /* Set initial state and call mmc_set_ios */
1703 mmc_set_initial_state(host);
1705 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1706 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1707 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1708 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1709 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1710 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1711 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1714 * This delay should be sufficient to allow the power supply
1715 * to reach the minimum voltage.
1719 mmc_pwrseq_post_power_on(host);
1721 host->ios.clock = host->f_init;
1723 host->ios.power_mode = MMC_POWER_ON;
1727 * This delay must be at least 74 clock sizes, or 1 ms, or the
1728 * time required to reach a stable voltage.
1732 mmc_host_clk_release(host);
1735 void mmc_power_off(struct mmc_host *host)
1737 if (host->ios.power_mode == MMC_POWER_OFF)
1740 mmc_host_clk_hold(host);
1742 mmc_pwrseq_power_off(host);
1744 host->ios.clock = 0;
1747 host->ios.power_mode = MMC_POWER_OFF;
1748 /* Set initial state and call mmc_set_ios */
1749 mmc_set_initial_state(host);
1752 * Some configurations, such as the 802.11 SDIO card in the OLPC
1753 * XO-1.5, require a short delay after poweroff before the card
1754 * can be successfully turned on again.
1758 mmc_host_clk_release(host);
1761 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1763 mmc_power_off(host);
1764 /* Wait at least 1 ms according to SD spec */
1766 mmc_power_up(host, ocr);
1770 * Cleanup when the last reference to the bus operator is dropped.
1772 static void __mmc_release_bus(struct mmc_host *host)
1775 BUG_ON(host->bus_refs);
1776 BUG_ON(!host->bus_dead);
1778 host->bus_ops = NULL;
1782 * Increase reference count of bus operator
1784 static inline void mmc_bus_get(struct mmc_host *host)
1786 unsigned long flags;
1788 spin_lock_irqsave(&host->lock, flags);
1790 spin_unlock_irqrestore(&host->lock, flags);
1794 * Decrease reference count of bus operator and free it if
1795 * it is the last reference.
1797 static inline void mmc_bus_put(struct mmc_host *host)
1799 unsigned long flags;
1801 spin_lock_irqsave(&host->lock, flags);
1803 if ((host->bus_refs == 0) && host->bus_ops)
1804 __mmc_release_bus(host);
1805 spin_unlock_irqrestore(&host->lock, flags);
1809 * Assign a mmc bus handler to a host. Only one bus handler may control a
1810 * host at any given time.
1812 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1814 unsigned long flags;
1819 WARN_ON(!host->claimed);
1821 spin_lock_irqsave(&host->lock, flags);
1823 BUG_ON(host->bus_ops);
1824 BUG_ON(host->bus_refs);
1826 host->bus_ops = ops;
1830 spin_unlock_irqrestore(&host->lock, flags);
1834 * Remove the current bus handler from a host.
1836 void mmc_detach_bus(struct mmc_host *host)
1838 unsigned long flags;
1842 WARN_ON(!host->claimed);
1843 WARN_ON(!host->bus_ops);
1845 spin_lock_irqsave(&host->lock, flags);
1849 spin_unlock_irqrestore(&host->lock, flags);
1854 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1857 #ifdef CONFIG_MMC_DEBUG
1858 unsigned long flags;
1859 spin_lock_irqsave(&host->lock, flags);
1860 WARN_ON(host->removed);
1861 spin_unlock_irqrestore(&host->lock, flags);
1865 * If the device is configured as wakeup, we prevent a new sleep for
1866 * 5 s to give provision for user space to consume the event.
1868 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1869 device_can_wakeup(mmc_dev(host)))
1870 pm_wakeup_event(mmc_dev(host), 5000);
1872 host->detect_change = 1;
1873 mmc_schedule_delayed_work(&host->detect, delay);
1877 * mmc_detect_change - process change of state on a MMC socket
1878 * @host: host which changed state.
1879 * @delay: optional delay to wait before detection (jiffies)
1881 * MMC drivers should call this when they detect a card has been
1882 * inserted or removed. The MMC layer will confirm that any
1883 * present card is still functional, and initialize any newly
1886 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1888 _mmc_detect_change(host, delay, true);
1890 EXPORT_SYMBOL(mmc_detect_change);
1892 void mmc_init_erase(struct mmc_card *card)
1896 if (is_power_of_2(card->erase_size))
1897 card->erase_shift = ffs(card->erase_size) - 1;
1899 card->erase_shift = 0;
1902 * It is possible to erase an arbitrarily large area of an SD or MMC
1903 * card. That is not desirable because it can take a long time
1904 * (minutes) potentially delaying more important I/O, and also the
1905 * timeout calculations become increasingly hugely over-estimated.
1906 * Consequently, 'pref_erase' is defined as a guide to limit erases
1907 * to that size and alignment.
1909 * For SD cards that define Allocation Unit size, limit erases to one
1910 * Allocation Unit at a time. For MMC cards that define High Capacity
1911 * Erase Size, whether it is switched on or not, limit to that size.
1912 * Otherwise just have a stab at a good value. For modern cards it
1913 * will end up being 4MiB. Note that if the value is too small, it
1914 * can end up taking longer to erase.
1916 if (mmc_card_sd(card) && card->ssr.au) {
1917 card->pref_erase = card->ssr.au;
1918 card->erase_shift = ffs(card->ssr.au) - 1;
1919 } else if (card->ext_csd.hc_erase_size) {
1920 card->pref_erase = card->ext_csd.hc_erase_size;
1921 } else if (card->erase_size) {
1922 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1924 card->pref_erase = 512 * 1024 / 512;
1926 card->pref_erase = 1024 * 1024 / 512;
1928 card->pref_erase = 2 * 1024 * 1024 / 512;
1930 card->pref_erase = 4 * 1024 * 1024 / 512;
1931 if (card->pref_erase < card->erase_size)
1932 card->pref_erase = card->erase_size;
1934 sz = card->pref_erase % card->erase_size;
1936 card->pref_erase += card->erase_size - sz;
1939 card->pref_erase = 0;
1942 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1943 unsigned int arg, unsigned int qty)
1945 unsigned int erase_timeout;
1947 if (arg == MMC_DISCARD_ARG ||
1948 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1949 erase_timeout = card->ext_csd.trim_timeout;
1950 } else if (card->ext_csd.erase_group_def & 1) {
1951 /* High Capacity Erase Group Size uses HC timeouts */
1952 if (arg == MMC_TRIM_ARG)
1953 erase_timeout = card->ext_csd.trim_timeout;
1955 erase_timeout = card->ext_csd.hc_erase_timeout;
1957 /* CSD Erase Group Size uses write timeout */
1958 unsigned int mult = (10 << card->csd.r2w_factor);
1959 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1960 unsigned int timeout_us;
1962 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1963 if (card->csd.tacc_ns < 1000000)
1964 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1966 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1969 * ios.clock is only a target. The real clock rate might be
1970 * less but not that much less, so fudge it by multiplying by 2.
1973 timeout_us += (timeout_clks * 1000) /
1974 (mmc_host_clk_rate(card->host) / 1000);
1976 erase_timeout = timeout_us / 1000;
1979 * Theoretically, the calculation could underflow so round up
1980 * to 1ms in that case.
1986 /* Multiplier for secure operations */
1987 if (arg & MMC_SECURE_ARGS) {
1988 if (arg == MMC_SECURE_ERASE_ARG)
1989 erase_timeout *= card->ext_csd.sec_erase_mult;
1991 erase_timeout *= card->ext_csd.sec_trim_mult;
1994 erase_timeout *= qty;
1997 * Ensure at least a 1 second timeout for SPI as per
1998 * 'mmc_set_data_timeout()'
2000 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2001 erase_timeout = 1000;
2003 return erase_timeout;
2006 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2010 unsigned int erase_timeout;
2012 if (card->ssr.erase_timeout) {
2013 /* Erase timeout specified in SD Status Register (SSR) */
2014 erase_timeout = card->ssr.erase_timeout * qty +
2015 card->ssr.erase_offset;
2018 * Erase timeout not specified in SD Status Register (SSR) so
2019 * use 250ms per write block.
2021 erase_timeout = 250 * qty;
2024 /* Must not be less than 1 second */
2025 if (erase_timeout < 1000)
2026 erase_timeout = 1000;
2028 return erase_timeout;
2031 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2035 if (mmc_card_sd(card))
2036 return mmc_sd_erase_timeout(card, arg, qty);
2038 return mmc_mmc_erase_timeout(card, arg, qty);
2041 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2042 unsigned int to, unsigned int arg)
2044 struct mmc_command cmd = {0};
2045 unsigned int qty = 0;
2046 unsigned long timeout;
2049 mmc_retune_hold(card->host);
2052 * qty is used to calculate the erase timeout which depends on how many
2053 * erase groups (or allocation units in SD terminology) are affected.
2054 * We count erasing part of an erase group as one erase group.
2055 * For SD, the allocation units are always a power of 2. For MMC, the
2056 * erase group size is almost certainly also power of 2, but it does not
2057 * seem to insist on that in the JEDEC standard, so we fall back to
2058 * division in that case. SD may not specify an allocation unit size,
2059 * in which case the timeout is based on the number of write blocks.
2061 * Note that the timeout for secure trim 2 will only be correct if the
2062 * number of erase groups specified is the same as the total of all
2063 * preceding secure trim 1 commands. Since the power may have been
2064 * lost since the secure trim 1 commands occurred, it is generally
2065 * impossible to calculate the secure trim 2 timeout correctly.
2067 if (card->erase_shift)
2068 qty += ((to >> card->erase_shift) -
2069 (from >> card->erase_shift)) + 1;
2070 else if (mmc_card_sd(card))
2071 qty += to - from + 1;
2073 qty += ((to / card->erase_size) -
2074 (from / card->erase_size)) + 1;
2076 if (!mmc_card_blockaddr(card)) {
2081 if (mmc_card_sd(card))
2082 cmd.opcode = SD_ERASE_WR_BLK_START;
2084 cmd.opcode = MMC_ERASE_GROUP_START;
2086 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2087 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2089 pr_err("mmc_erase: group start error %d, "
2090 "status %#x\n", err, cmd.resp[0]);
2095 memset(&cmd, 0, sizeof(struct mmc_command));
2096 if (mmc_card_sd(card))
2097 cmd.opcode = SD_ERASE_WR_BLK_END;
2099 cmd.opcode = MMC_ERASE_GROUP_END;
2101 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2102 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2104 pr_err("mmc_erase: group end error %d, status %#x\n",
2110 memset(&cmd, 0, sizeof(struct mmc_command));
2111 cmd.opcode = MMC_ERASE;
2113 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2114 cmd.busy_timeout = mmc_erase_timeout(card, arg, qty);
2115 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2117 pr_err("mmc_erase: erase error %d, status %#x\n",
2123 if (mmc_host_is_spi(card->host))
2126 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2128 memset(&cmd, 0, sizeof(struct mmc_command));
2129 cmd.opcode = MMC_SEND_STATUS;
2130 cmd.arg = card->rca << 16;
2131 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2132 /* Do not retry else we can't see errors */
2133 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2134 if (err || (cmd.resp[0] & 0xFDF92000)) {
2135 pr_err("error %d requesting status %#x\n",
2141 /* Timeout if the device never becomes ready for data and
2142 * never leaves the program state.
2144 if (time_after(jiffies, timeout)) {
2145 pr_err("%s: Card stuck in programming state! %s\n",
2146 mmc_hostname(card->host), __func__);
2151 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2152 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2154 mmc_retune_release(card->host);
2159 * mmc_erase - erase sectors.
2160 * @card: card to erase
2161 * @from: first sector to erase
2162 * @nr: number of sectors to erase
2163 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2165 * Caller must claim host before calling this function.
2167 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2170 unsigned int rem, to = from + nr;
2172 if (!(card->host->caps & MMC_CAP_ERASE) ||
2173 !(card->csd.cmdclass & CCC_ERASE))
2176 if (!card->erase_size)
2179 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2182 if ((arg & MMC_SECURE_ARGS) &&
2183 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2186 if ((arg & MMC_TRIM_ARGS) &&
2187 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2190 if (arg == MMC_SECURE_ERASE_ARG) {
2191 if (from % card->erase_size || nr % card->erase_size)
2195 if (arg == MMC_ERASE_ARG) {
2196 rem = from % card->erase_size;
2198 rem = card->erase_size - rem;
2205 rem = nr % card->erase_size;
2218 /* 'from' and 'to' are inclusive */
2221 return mmc_do_erase(card, from, to, arg);
2223 EXPORT_SYMBOL(mmc_erase);
2225 int mmc_can_erase(struct mmc_card *card)
2227 if ((card->host->caps & MMC_CAP_ERASE) &&
2228 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2232 EXPORT_SYMBOL(mmc_can_erase);
2234 int mmc_can_trim(struct mmc_card *card)
2236 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
2240 EXPORT_SYMBOL(mmc_can_trim);
2242 int mmc_can_discard(struct mmc_card *card)
2245 * As there's no way to detect the discard support bit at v4.5
2246 * use the s/w feature support filed.
2248 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2252 EXPORT_SYMBOL(mmc_can_discard);
2254 int mmc_can_sanitize(struct mmc_card *card)
2256 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2258 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2262 EXPORT_SYMBOL(mmc_can_sanitize);
2264 int mmc_can_secure_erase_trim(struct mmc_card *card)
2266 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2267 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2271 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2273 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2276 if (!card->erase_size)
2278 if (from % card->erase_size || nr % card->erase_size)
2282 EXPORT_SYMBOL(mmc_erase_group_aligned);
2284 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2287 struct mmc_host *host = card->host;
2288 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2289 unsigned int last_timeout = 0;
2291 if (card->erase_shift)
2292 max_qty = UINT_MAX >> card->erase_shift;
2293 else if (mmc_card_sd(card))
2296 max_qty = UINT_MAX / card->erase_size;
2298 /* Find the largest qty with an OK timeout */
2301 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2302 timeout = mmc_erase_timeout(card, arg, qty + x);
2303 if (timeout > host->max_busy_timeout)
2305 if (timeout < last_timeout)
2307 last_timeout = timeout;
2319 /* Convert qty to sectors */
2320 if (card->erase_shift)
2321 max_discard = --qty << card->erase_shift;
2322 else if (mmc_card_sd(card))
2325 max_discard = --qty * card->erase_size;
2330 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2332 struct mmc_host *host = card->host;
2333 unsigned int max_discard, max_trim;
2335 if (!host->max_busy_timeout)
2339 * Without erase_group_def set, MMC erase timeout depends on clock
2340 * frequence which can change. In that case, the best choice is
2341 * just the preferred erase size.
2343 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2344 return card->pref_erase;
2346 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2347 if (mmc_can_trim(card)) {
2348 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2349 if (max_trim < max_discard)
2350 max_discard = max_trim;
2351 } else if (max_discard < card->erase_size) {
2354 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2355 mmc_hostname(host), max_discard, host->max_busy_timeout);
2358 EXPORT_SYMBOL(mmc_calc_max_discard);
2360 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2362 struct mmc_command cmd = {0};
2364 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card))
2367 cmd.opcode = MMC_SET_BLOCKLEN;
2369 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2370 return mmc_wait_for_cmd(card->host, &cmd, 5);
2372 EXPORT_SYMBOL(mmc_set_blocklen);
2374 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2377 struct mmc_command cmd = {0};
2379 cmd.opcode = MMC_SET_BLOCK_COUNT;
2380 cmd.arg = blockcount & 0x0000FFFF;
2383 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2384 return mmc_wait_for_cmd(card->host, &cmd, 5);
2386 EXPORT_SYMBOL(mmc_set_blockcount);
2388 static void mmc_hw_reset_for_init(struct mmc_host *host)
2390 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2392 mmc_host_clk_hold(host);
2393 host->ops->hw_reset(host);
2394 mmc_host_clk_release(host);
2397 int mmc_hw_reset(struct mmc_host *host)
2405 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2410 ret = host->bus_ops->reset(host);
2413 if (ret != -EOPNOTSUPP)
2414 pr_warn("%s: tried to reset card\n", mmc_hostname(host));
2418 EXPORT_SYMBOL(mmc_hw_reset);
2420 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2422 host->f_init = freq;
2424 #ifdef CONFIG_MMC_DEBUG
2425 pr_info("%s: %s: trying to init card at %u Hz\n",
2426 mmc_hostname(host), __func__, host->f_init);
2428 mmc_power_up(host, host->ocr_avail);
2431 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2432 * do a hardware reset if possible.
2434 mmc_hw_reset_for_init(host);
2437 * sdio_reset sends CMD52 to reset card. Since we do not know
2438 * if the card is being re-initialized, just send it. CMD52
2439 * should be ignored by SD/eMMC cards.
2444 mmc_send_if_cond(host, host->ocr_avail);
2446 /* Order's important: probe SDIO, then SD, then MMC */
2447 if (!mmc_attach_sdio(host))
2449 if (!mmc_attach_sd(host))
2451 if (!mmc_attach_mmc(host))
2454 mmc_power_off(host);
2458 int _mmc_detect_card_removed(struct mmc_host *host)
2462 if (host->caps & MMC_CAP_NONREMOVABLE)
2465 if (!host->card || mmc_card_removed(host->card))
2468 ret = host->bus_ops->alive(host);
2471 * Card detect status and alive check may be out of sync if card is
2472 * removed slowly, when card detect switch changes while card/slot
2473 * pads are still contacted in hardware (refer to "SD Card Mechanical
2474 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2475 * detect work 200ms later for this case.
2477 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2478 mmc_detect_change(host, msecs_to_jiffies(200));
2479 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2483 mmc_card_set_removed(host->card);
2484 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2490 int mmc_detect_card_removed(struct mmc_host *host)
2492 struct mmc_card *card = host->card;
2495 WARN_ON(!host->claimed);
2500 ret = mmc_card_removed(card);
2502 * The card will be considered unchanged unless we have been asked to
2503 * detect a change or host requires polling to provide card detection.
2505 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2508 host->detect_change = 0;
2510 ret = _mmc_detect_card_removed(host);
2511 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2513 * Schedule a detect work as soon as possible to let a
2514 * rescan handle the card removal.
2516 cancel_delayed_work(&host->detect);
2517 _mmc_detect_change(host, 0, false);
2523 EXPORT_SYMBOL(mmc_detect_card_removed);
2525 void mmc_rescan(struct work_struct *work)
2527 struct mmc_host *host =
2528 container_of(work, struct mmc_host, detect.work);
2531 if (host->trigger_card_event && host->ops->card_event) {
2532 host->ops->card_event(host);
2533 host->trigger_card_event = false;
2536 if (host->rescan_disable)
2539 /* If there is a non-removable card registered, only scan once */
2540 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2542 host->rescan_entered = 1;
2547 * if there is a _removable_ card registered, check whether it is
2550 if (host->bus_ops && !host->bus_dead
2551 && !(host->caps & MMC_CAP_NONREMOVABLE))
2552 host->bus_ops->detect(host);
2554 host->detect_change = 0;
2557 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2558 * the card is no longer present.
2563 /* if there still is a card present, stop here */
2564 if (host->bus_ops != NULL) {
2570 * Only we can add a new handler, so it's safe to
2571 * release the lock here.
2575 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2576 host->ops->get_cd(host) == 0) {
2577 mmc_claim_host(host);
2578 mmc_power_off(host);
2579 mmc_release_host(host);
2583 mmc_claim_host(host);
2584 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2585 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2587 if (freqs[i] <= host->f_min)
2590 mmc_release_host(host);
2593 if (host->caps & MMC_CAP_NEEDS_POLL)
2594 mmc_schedule_delayed_work(&host->detect, HZ);
2597 void mmc_start_host(struct mmc_host *host)
2599 host->f_init = max(freqs[0], host->f_min);
2600 host->rescan_disable = 0;
2601 host->ios.power_mode = MMC_POWER_UNDEFINED;
2602 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2603 mmc_power_off(host);
2605 mmc_power_up(host, host->ocr_avail);
2606 mmc_gpiod_request_cd_irq(host);
2607 _mmc_detect_change(host, 0, false);
2610 void mmc_stop_host(struct mmc_host *host)
2612 #ifdef CONFIG_MMC_DEBUG
2613 unsigned long flags;
2614 spin_lock_irqsave(&host->lock, flags);
2616 spin_unlock_irqrestore(&host->lock, flags);
2618 if (host->slot.cd_irq >= 0)
2619 disable_irq(host->slot.cd_irq);
2621 host->rescan_disable = 1;
2622 cancel_delayed_work_sync(&host->detect);
2623 mmc_flush_scheduled_work();
2625 /* clear pm flags now and let card drivers set them as needed */
2629 if (host->bus_ops && !host->bus_dead) {
2630 /* Calling bus_ops->remove() with a claimed host can deadlock */
2631 host->bus_ops->remove(host);
2632 mmc_claim_host(host);
2633 mmc_detach_bus(host);
2634 mmc_power_off(host);
2635 mmc_release_host(host);
2643 mmc_power_off(host);
2646 int mmc_power_save_host(struct mmc_host *host)
2650 #ifdef CONFIG_MMC_DEBUG
2651 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2656 if (!host->bus_ops || host->bus_dead) {
2661 if (host->bus_ops->power_save)
2662 ret = host->bus_ops->power_save(host);
2666 mmc_power_off(host);
2670 EXPORT_SYMBOL(mmc_power_save_host);
2672 int mmc_power_restore_host(struct mmc_host *host)
2676 #ifdef CONFIG_MMC_DEBUG
2677 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2682 if (!host->bus_ops || host->bus_dead) {
2687 mmc_power_up(host, host->card->ocr);
2688 ret = host->bus_ops->power_restore(host);
2694 EXPORT_SYMBOL(mmc_power_restore_host);
2697 * Flush the cache to the non-volatile storage.
2699 int mmc_flush_cache(struct mmc_card *card)
2703 if (mmc_card_mmc(card) &&
2704 (card->ext_csd.cache_size > 0) &&
2705 (card->ext_csd.cache_ctrl & 1)) {
2706 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2707 EXT_CSD_FLUSH_CACHE, 1, 0);
2709 pr_err("%s: cache flush error %d\n",
2710 mmc_hostname(card->host), err);
2715 EXPORT_SYMBOL(mmc_flush_cache);
2719 /* Do the card removal on suspend if card is assumed removeable
2720 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2723 int mmc_pm_notify(struct notifier_block *notify_block,
2724 unsigned long mode, void *unused)
2726 struct mmc_host *host = container_of(
2727 notify_block, struct mmc_host, pm_notify);
2728 unsigned long flags;
2732 case PM_HIBERNATION_PREPARE:
2733 case PM_SUSPEND_PREPARE:
2734 case PM_RESTORE_PREPARE:
2735 spin_lock_irqsave(&host->lock, flags);
2736 host->rescan_disable = 1;
2737 spin_unlock_irqrestore(&host->lock, flags);
2738 cancel_delayed_work_sync(&host->detect);
2743 /* Validate prerequisites for suspend */
2744 if (host->bus_ops->pre_suspend)
2745 err = host->bus_ops->pre_suspend(host);
2749 /* Calling bus_ops->remove() with a claimed host can deadlock */
2750 host->bus_ops->remove(host);
2751 mmc_claim_host(host);
2752 mmc_detach_bus(host);
2753 mmc_power_off(host);
2754 mmc_release_host(host);
2758 case PM_POST_SUSPEND:
2759 case PM_POST_HIBERNATION:
2760 case PM_POST_RESTORE:
2762 spin_lock_irqsave(&host->lock, flags);
2763 host->rescan_disable = 0;
2764 spin_unlock_irqrestore(&host->lock, flags);
2765 _mmc_detect_change(host, 0, false);
2774 * mmc_init_context_info() - init synchronization context
2777 * Init struct context_info needed to implement asynchronous
2778 * request mechanism, used by mmc core, host driver and mmc requests
2781 void mmc_init_context_info(struct mmc_host *host)
2783 spin_lock_init(&host->context_info.lock);
2784 host->context_info.is_new_req = false;
2785 host->context_info.is_done_rcv = false;
2786 host->context_info.is_waiting_last_req = false;
2787 init_waitqueue_head(&host->context_info.wait);
2790 static int __init mmc_init(void)
2794 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2798 ret = mmc_register_bus();
2800 goto destroy_workqueue;
2802 ret = mmc_register_host_class();
2804 goto unregister_bus;
2806 ret = sdio_register_bus();
2808 goto unregister_host_class;
2812 unregister_host_class:
2813 mmc_unregister_host_class();
2815 mmc_unregister_bus();
2817 destroy_workqueue(workqueue);
2822 static void __exit mmc_exit(void)
2824 sdio_unregister_bus();
2825 mmc_unregister_host_class();
2826 mmc_unregister_bus();
2827 destroy_workqueue(workqueue);
2830 subsys_initcall(mmc_init);
2831 module_exit(mmc_exit);
2833 MODULE_LICENSE("GPL");