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>
32 #include <linux/wakelock.h>
34 #include <trace/events/mmc.h>
36 #include <linux/mmc/card.h>
37 #include <linux/mmc/host.h>
38 #include <linux/mmc/mmc.h>
39 #include <linux/mmc/sd.h>
40 #include <linux/mmc/slot-gpio.h>
52 /* If the device is not responding */
53 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
56 * Background operations can take a long time, depending on the housekeeping
57 * operations the card has to perform.
59 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
61 static struct workqueue_struct *workqueue;
62 static struct wake_lock mmc_delayed_work_wake_lock;
63 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
66 * Enabling software CRCs on the data blocks can be a significant (30%)
67 * performance cost, and for other reasons may not always be desired.
68 * So we allow it it to be disabled.
71 module_param(use_spi_crc, bool, 0);
74 * Internal function. Schedule delayed work in the MMC work queue.
76 static int mmc_schedule_delayed_work(struct delayed_work *work,
79 wake_lock(&mmc_delayed_work_wake_lock);
80 return queue_delayed_work(workqueue, work, delay);
84 * Internal function. Flush all scheduled work from the MMC work queue.
86 static void mmc_flush_scheduled_work(void)
88 flush_workqueue(workqueue);
91 #ifdef CONFIG_FAIL_MMC_REQUEST
94 * Internal function. Inject random data errors.
95 * If mmc_data is NULL no errors are injected.
97 static void mmc_should_fail_request(struct mmc_host *host,
98 struct mmc_request *mrq)
100 struct mmc_command *cmd = mrq->cmd;
101 struct mmc_data *data = mrq->data;
102 static const int data_errors[] = {
111 if (cmd->error || data->error ||
112 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
115 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
116 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
119 #else /* CONFIG_FAIL_MMC_REQUEST */
121 static inline void mmc_should_fail_request(struct mmc_host *host,
122 struct mmc_request *mrq)
126 #endif /* CONFIG_FAIL_MMC_REQUEST */
129 * mmc_request_done - finish processing an MMC request
130 * @host: MMC host which completed request
131 * @mrq: MMC request which request
133 * MMC drivers should call this function when they have completed
134 * their processing of a request.
136 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
138 struct mmc_command *cmd = mrq->cmd;
139 int err = cmd->error;
141 /* Flag re-tuning needed on CRC errors */
142 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
143 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
144 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
145 (mrq->data && mrq->data->error == -EILSEQ) ||
146 (mrq->stop && mrq->stop->error == -EILSEQ)))
147 mmc_retune_needed(host);
149 if (err && cmd->retries && mmc_host_is_spi(host)) {
150 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
154 if (err && cmd->retries && !mmc_card_removed(host->card)) {
156 * Request starter must handle retries - see
157 * mmc_wait_for_req_done().
162 mmc_should_fail_request(host, mrq);
164 led_trigger_event(host->led, LED_OFF);
167 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
168 mmc_hostname(host), mrq->sbc->opcode,
170 mrq->sbc->resp[0], mrq->sbc->resp[1],
171 mrq->sbc->resp[2], mrq->sbc->resp[3]);
174 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
175 mmc_hostname(host), cmd->opcode, err,
176 cmd->resp[0], cmd->resp[1],
177 cmd->resp[2], cmd->resp[3]);
180 pr_debug("%s: %d bytes transferred: %d\n",
182 mrq->data->bytes_xfered, mrq->data->error);
183 trace_mmc_blk_rw_end(cmd->opcode, cmd->arg, mrq->data);
187 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
188 mmc_hostname(host), mrq->stop->opcode,
190 mrq->stop->resp[0], mrq->stop->resp[1],
191 mrq->stop->resp[2], mrq->stop->resp[3]);
199 EXPORT_SYMBOL(mmc_request_done);
201 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
205 /* Assumes host controller has been runtime resumed by mmc_claim_host */
206 err = mmc_retune(host);
208 mrq->cmd->error = err;
209 mmc_request_done(host, mrq);
214 * For sdio rw commands we must wait for card busy otherwise some
215 * sdio devices won't work properly.
217 if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
218 int tries = 500; /* Wait aprox 500ms at maximum */
220 while (host->ops->card_busy(host) && --tries)
224 mrq->cmd->error = -EBUSY;
225 mmc_request_done(host, mrq);
230 host->ops->request(host, mrq);
233 static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
235 #ifdef CONFIG_MMC_DEBUG
237 struct scatterlist *sg;
239 mmc_retune_hold(host);
241 if (mmc_card_removed(host->card))
245 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
246 mmc_hostname(host), mrq->sbc->opcode,
247 mrq->sbc->arg, mrq->sbc->flags);
250 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
251 mmc_hostname(host), mrq->cmd->opcode,
252 mrq->cmd->arg, mrq->cmd->flags);
255 pr_debug("%s: blksz %d blocks %d flags %08x "
256 "tsac %d ms nsac %d\n",
257 mmc_hostname(host), mrq->data->blksz,
258 mrq->data->blocks, mrq->data->flags,
259 mrq->data->timeout_ns / 1000000,
260 mrq->data->timeout_clks);
264 pr_debug("%s: CMD%u arg %08x flags %08x\n",
265 mmc_hostname(host), mrq->stop->opcode,
266 mrq->stop->arg, mrq->stop->flags);
269 WARN_ON(!host->claimed);
278 BUG_ON(mrq->data->blksz > host->max_blk_size);
279 BUG_ON(mrq->data->blocks > host->max_blk_count);
280 BUG_ON(mrq->data->blocks * mrq->data->blksz >
283 #ifdef CONFIG_MMC_DEBUG
285 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
287 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
290 mrq->cmd->data = mrq->data;
291 mrq->data->error = 0;
292 mrq->data->mrq = mrq;
294 mrq->data->stop = mrq->stop;
295 mrq->stop->error = 0;
296 mrq->stop->mrq = mrq;
299 led_trigger_event(host->led, LED_FULL);
300 __mmc_start_request(host, mrq);
306 * mmc_start_bkops - start BKOPS for supported cards
307 * @card: MMC card to start BKOPS
308 * @form_exception: A flag to indicate if this function was
309 * called due to an exception raised by the card
311 * Start background operations whenever requested.
312 * When the urgent BKOPS bit is set in a R1 command response
313 * then background operations should be started immediately.
315 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
319 bool use_busy_signal;
323 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
326 err = mmc_read_bkops_status(card);
328 pr_err("%s: Failed to read bkops status: %d\n",
329 mmc_hostname(card->host), err);
333 if (!card->ext_csd.raw_bkops_status)
336 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
340 mmc_claim_host(card->host);
341 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
342 timeout = MMC_BKOPS_MAX_TIMEOUT;
343 use_busy_signal = true;
346 use_busy_signal = false;
349 mmc_retune_hold(card->host);
351 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
352 EXT_CSD_BKOPS_START, 1, timeout,
353 use_busy_signal, true, false);
355 pr_warn("%s: Error %d starting bkops\n",
356 mmc_hostname(card->host), err);
357 mmc_retune_release(card->host);
362 * For urgent bkops status (LEVEL_2 and more)
363 * bkops executed synchronously, otherwise
364 * the operation is in progress
366 if (!use_busy_signal)
367 mmc_card_set_doing_bkops(card);
369 mmc_retune_release(card->host);
371 mmc_release_host(card->host);
373 EXPORT_SYMBOL(mmc_start_bkops);
376 * mmc_wait_data_done() - done callback for data request
377 * @mrq: done data request
379 * Wakes up mmc context, passed as a callback to host controller driver
381 static void mmc_wait_data_done(struct mmc_request *mrq)
383 struct mmc_context_info *context_info = &mrq->host->context_info;
385 context_info->is_done_rcv = true;
386 wake_up_interruptible(&context_info->wait);
389 static void mmc_wait_done(struct mmc_request *mrq)
391 complete(&mrq->completion);
395 *__mmc_start_data_req() - starts data request
396 * @host: MMC host to start the request
397 * @mrq: data request to start
399 * Sets the done callback to be called when request is completed by the card.
400 * Starts data mmc request execution
402 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
406 mrq->done = mmc_wait_data_done;
409 err = mmc_start_request(host, mrq);
411 mrq->cmd->error = err;
412 mmc_wait_data_done(mrq);
418 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
422 init_completion(&mrq->completion);
423 mrq->done = mmc_wait_done;
425 err = mmc_start_request(host, mrq);
427 mrq->cmd->error = err;
428 complete(&mrq->completion);
435 * mmc_wait_for_data_req_done() - wait for request completed
436 * @host: MMC host to prepare the command.
437 * @mrq: MMC request to wait for
439 * Blocks MMC context till host controller will ack end of data request
440 * execution or new request notification arrives from the block layer.
441 * Handles command retries.
443 * Returns enum mmc_blk_status after checking errors.
445 static int mmc_wait_for_data_req_done(struct mmc_host *host,
446 struct mmc_request *mrq,
447 struct mmc_async_req *next_req)
449 struct mmc_command *cmd;
450 struct mmc_context_info *context_info = &host->context_info;
455 wait_event_interruptible(context_info->wait,
456 (context_info->is_done_rcv ||
457 context_info->is_new_req));
458 spin_lock_irqsave(&context_info->lock, flags);
459 context_info->is_waiting_last_req = false;
460 spin_unlock_irqrestore(&context_info->lock, flags);
461 if (context_info->is_done_rcv) {
462 context_info->is_done_rcv = false;
463 context_info->is_new_req = false;
466 if (!cmd->error || !cmd->retries ||
467 mmc_card_removed(host->card)) {
468 err = host->areq->err_check(host->card,
470 break; /* return err */
472 mmc_retune_recheck(host);
473 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
475 cmd->opcode, cmd->error);
478 __mmc_start_request(host, mrq);
479 continue; /* wait for done/new event again */
481 } else if (context_info->is_new_req) {
482 context_info->is_new_req = false;
484 return MMC_BLK_NEW_REQUEST;
487 mmc_retune_release(host);
491 static void mmc_wait_for_req_done(struct mmc_host *host,
492 struct mmc_request *mrq)
494 struct mmc_command *cmd;
497 wait_for_completion(&mrq->completion);
502 * If host has timed out waiting for the sanitize
503 * to complete, card might be still in programming state
504 * so let's try to bring the card out of programming
507 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
508 if (!mmc_interrupt_hpi(host->card)) {
509 pr_warn("%s: %s: Interrupted sanitize\n",
510 mmc_hostname(host), __func__);
514 pr_err("%s: %s: Failed to interrupt sanitize\n",
515 mmc_hostname(host), __func__);
518 if (!cmd->error || !cmd->retries ||
519 mmc_card_removed(host->card))
522 mmc_retune_recheck(host);
524 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
525 mmc_hostname(host), cmd->opcode, cmd->error);
528 __mmc_start_request(host, mrq);
531 mmc_retune_release(host);
535 * mmc_pre_req - Prepare for a new request
536 * @host: MMC host to prepare command
537 * @mrq: MMC request to prepare for
538 * @is_first_req: true if there is no previous started request
539 * that may run in parellel to this call, otherwise false
541 * mmc_pre_req() is called in prior to mmc_start_req() to let
542 * host prepare for the new request. Preparation of a request may be
543 * performed while another request is running on the host.
545 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
548 if (host->ops->pre_req)
549 host->ops->pre_req(host, mrq, is_first_req);
553 * mmc_post_req - Post process a completed request
554 * @host: MMC host to post process command
555 * @mrq: MMC request to post process for
556 * @err: Error, if non zero, clean up any resources made in pre_req
558 * Let the host post process a completed request. Post processing of
559 * a request may be performed while another reuqest is running.
561 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
564 if (host->ops->post_req)
565 host->ops->post_req(host, mrq, err);
569 * mmc_start_req - start a non-blocking request
570 * @host: MMC host to start command
571 * @areq: async request to start
572 * @error: out parameter returns 0 for success, otherwise non zero
574 * Start a new MMC custom command request for a host.
575 * If there is on ongoing async request wait for completion
576 * of that request and start the new one and return.
577 * Does not wait for the new request to complete.
579 * Returns the completed request, NULL in case of none completed.
580 * Wait for the an ongoing request (previoulsy started) to complete and
581 * return the completed request. If there is no ongoing request, NULL
582 * is returned without waiting. NULL is not an error condition.
584 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
585 struct mmc_async_req *areq, int *error)
589 struct mmc_async_req *data = host->areq;
591 /* Prepare a new request */
593 mmc_pre_req(host, areq->mrq, !host->areq);
596 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
597 if (err == MMC_BLK_NEW_REQUEST) {
601 * The previous request was not completed,
607 * Check BKOPS urgency for each R1 response
609 if (host->card && mmc_card_mmc(host->card) &&
610 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
611 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
612 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
614 /* Cancel the prepared request */
616 mmc_post_req(host, areq->mrq, -EINVAL);
618 mmc_start_bkops(host->card, true);
620 /* prepare the request again */
622 mmc_pre_req(host, areq->mrq, !host->areq);
627 trace_mmc_blk_rw_start(areq->mrq->cmd->opcode,
630 start_err = __mmc_start_data_req(host, areq->mrq);
634 mmc_post_req(host, host->areq->mrq, 0);
636 /* Cancel a prepared request if it was not started. */
637 if ((err || start_err) && areq)
638 mmc_post_req(host, areq->mrq, -EINVAL);
649 EXPORT_SYMBOL(mmc_start_req);
652 * mmc_wait_for_req - start a request and wait for completion
653 * @host: MMC host to start command
654 * @mrq: MMC request to start
656 * Start a new MMC custom command request for a host, and wait
657 * for the command to complete. Does not attempt to parse the
660 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
662 __mmc_start_req(host, mrq);
663 mmc_wait_for_req_done(host, mrq);
665 EXPORT_SYMBOL(mmc_wait_for_req);
668 * mmc_interrupt_hpi - Issue for High priority Interrupt
669 * @card: the MMC card associated with the HPI transfer
671 * Issued High Priority Interrupt, and check for card status
672 * until out-of prg-state.
674 int mmc_interrupt_hpi(struct mmc_card *card)
678 unsigned long prg_wait;
682 if (!card->ext_csd.hpi_en) {
683 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
687 mmc_claim_host(card->host);
688 err = mmc_send_status(card, &status);
690 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
694 switch (R1_CURRENT_STATE(status)) {
700 * In idle and transfer states, HPI is not needed and the caller
701 * can issue the next intended command immediately
707 /* In all other states, it's illegal to issue HPI */
708 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
709 mmc_hostname(card->host), R1_CURRENT_STATE(status));
714 err = mmc_send_hpi_cmd(card, &status);
718 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
720 err = mmc_send_status(card, &status);
722 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
724 if (time_after(jiffies, prg_wait))
729 mmc_release_host(card->host);
732 EXPORT_SYMBOL(mmc_interrupt_hpi);
735 * mmc_wait_for_cmd - start a command and wait for completion
736 * @host: MMC host to start command
737 * @cmd: MMC command to start
738 * @retries: maximum number of retries
740 * Start a new MMC command for a host, and wait for the command
741 * to complete. Return any error that occurred while the command
742 * was executing. Do not attempt to parse the response.
744 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
746 struct mmc_request mrq = {NULL};
748 WARN_ON(!host->claimed);
750 memset(cmd->resp, 0, sizeof(cmd->resp));
751 cmd->retries = retries;
756 mmc_wait_for_req(host, &mrq);
761 EXPORT_SYMBOL(mmc_wait_for_cmd);
764 * mmc_stop_bkops - stop ongoing BKOPS
765 * @card: MMC card to check BKOPS
767 * Send HPI command to stop ongoing background operations to
768 * allow rapid servicing of foreground operations, e.g. read/
769 * writes. Wait until the card comes out of the programming state
770 * to avoid errors in servicing read/write requests.
772 int mmc_stop_bkops(struct mmc_card *card)
777 err = mmc_interrupt_hpi(card);
780 * If err is EINVAL, we can't issue an HPI.
781 * It should complete the BKOPS.
783 if (!err || (err == -EINVAL)) {
784 mmc_card_clr_doing_bkops(card);
785 mmc_retune_release(card->host);
791 EXPORT_SYMBOL(mmc_stop_bkops);
793 int mmc_read_bkops_status(struct mmc_card *card)
798 mmc_claim_host(card->host);
799 err = mmc_get_ext_csd(card, &ext_csd);
800 mmc_release_host(card->host);
804 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
805 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
809 EXPORT_SYMBOL(mmc_read_bkops_status);
812 * mmc_set_data_timeout - set the timeout for a data command
813 * @data: data phase for command
814 * @card: the MMC card associated with the data transfer
816 * Computes the data timeout parameters according to the
817 * correct algorithm given the card type.
819 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
824 * SDIO cards only define an upper 1 s limit on access.
826 if (mmc_card_sdio(card)) {
827 data->timeout_ns = 1000000000;
828 data->timeout_clks = 0;
833 * SD cards use a 100 multiplier rather than 10
835 mult = mmc_card_sd(card) ? 100 : 10;
838 * Scale up the multiplier (and therefore the timeout) by
839 * the r2w factor for writes.
841 if (data->flags & MMC_DATA_WRITE)
842 mult <<= card->csd.r2w_factor;
844 data->timeout_ns = card->csd.tacc_ns * mult;
845 data->timeout_clks = card->csd.tacc_clks * mult;
848 * SD cards also have an upper limit on the timeout.
850 if (mmc_card_sd(card)) {
851 unsigned int timeout_us, limit_us;
853 timeout_us = data->timeout_ns / 1000;
854 if (card->host->ios.clock)
855 timeout_us += data->timeout_clks * 1000 /
856 (card->host->ios.clock / 1000);
858 if (data->flags & MMC_DATA_WRITE)
860 * The MMC spec "It is strongly recommended
861 * for hosts to implement more than 500ms
862 * timeout value even if the card indicates
863 * the 250ms maximum busy length." Even the
864 * previous value of 300ms is known to be
865 * insufficient for some cards.
872 * SDHC cards always use these fixed values.
874 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
875 data->timeout_ns = limit_us * 1000;
876 data->timeout_clks = 0;
879 /* assign limit value if invalid */
881 data->timeout_ns = limit_us * 1000;
885 * Some cards require longer data read timeout than indicated in CSD.
886 * Address this by setting the read timeout to a "reasonably high"
887 * value. For the cards tested, 300ms has proven enough. If necessary,
888 * this value can be increased if other problematic cards require this.
890 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
891 data->timeout_ns = 300000000;
892 data->timeout_clks = 0;
896 * Some cards need very high timeouts if driven in SPI mode.
897 * The worst observed timeout was 900ms after writing a
898 * continuous stream of data until the internal logic
901 if (mmc_host_is_spi(card->host)) {
902 if (data->flags & MMC_DATA_WRITE) {
903 if (data->timeout_ns < 1000000000)
904 data->timeout_ns = 1000000000; /* 1s */
906 if (data->timeout_ns < 100000000)
907 data->timeout_ns = 100000000; /* 100ms */
911 EXPORT_SYMBOL(mmc_set_data_timeout);
914 * mmc_align_data_size - pads a transfer size to a more optimal value
915 * @card: the MMC card associated with the data transfer
916 * @sz: original transfer size
918 * Pads the original data size with a number of extra bytes in
919 * order to avoid controller bugs and/or performance hits
920 * (e.g. some controllers revert to PIO for certain sizes).
922 * Returns the improved size, which might be unmodified.
924 * Note that this function is only relevant when issuing a
925 * single scatter gather entry.
927 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
930 * FIXME: We don't have a system for the controller to tell
931 * the core about its problems yet, so for now we just 32-bit
934 sz = ((sz + 3) / 4) * 4;
938 EXPORT_SYMBOL(mmc_align_data_size);
941 * __mmc_claim_host - exclusively claim a host
942 * @host: mmc host to claim
943 * @abort: whether or not the operation should be aborted
945 * Claim a host for a set of operations. If @abort is non null and
946 * dereference a non-zero value then this will return prematurely with
947 * that non-zero value without acquiring the lock. Returns zero
948 * with the lock held otherwise.
950 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
952 DECLARE_WAITQUEUE(wait, current);
959 add_wait_queue(&host->wq, &wait);
960 spin_lock_irqsave(&host->lock, flags);
962 set_current_state(TASK_UNINTERRUPTIBLE);
963 stop = abort ? atomic_read(abort) : 0;
964 if (stop || !host->claimed || host->claimer == current)
966 spin_unlock_irqrestore(&host->lock, flags);
968 spin_lock_irqsave(&host->lock, flags);
970 set_current_state(TASK_RUNNING);
973 host->claimer = current;
974 host->claim_cnt += 1;
975 if (host->claim_cnt == 1)
979 spin_unlock_irqrestore(&host->lock, flags);
980 remove_wait_queue(&host->wq, &wait);
983 pm_runtime_get_sync(mmc_dev(host));
987 EXPORT_SYMBOL(__mmc_claim_host);
990 * mmc_release_host - release a host
991 * @host: mmc host to release
993 * Release a MMC host, allowing others to claim the host
994 * for their operations.
996 void mmc_release_host(struct mmc_host *host)
1000 WARN_ON(!host->claimed);
1002 spin_lock_irqsave(&host->lock, flags);
1003 if (--host->claim_cnt) {
1004 /* Release for nested claim */
1005 spin_unlock_irqrestore(&host->lock, flags);
1008 host->claimer = NULL;
1009 spin_unlock_irqrestore(&host->lock, flags);
1011 pm_runtime_mark_last_busy(mmc_dev(host));
1012 pm_runtime_put_autosuspend(mmc_dev(host));
1015 EXPORT_SYMBOL(mmc_release_host);
1018 * This is a helper function, which fetches a runtime pm reference for the
1019 * card device and also claims the host.
1021 void mmc_get_card(struct mmc_card *card)
1023 pm_runtime_get_sync(&card->dev);
1024 mmc_claim_host(card->host);
1026 EXPORT_SYMBOL(mmc_get_card);
1029 * This is a helper function, which releases the host and drops the runtime
1030 * pm reference for the card device.
1032 void mmc_put_card(struct mmc_card *card)
1034 mmc_release_host(card->host);
1035 pm_runtime_mark_last_busy(&card->dev);
1036 pm_runtime_put_autosuspend(&card->dev);
1038 EXPORT_SYMBOL(mmc_put_card);
1041 * Internal function that does the actual ios call to the host driver,
1042 * optionally printing some debug output.
1044 static inline void mmc_set_ios(struct mmc_host *host)
1046 struct mmc_ios *ios = &host->ios;
1048 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1049 "width %u timing %u\n",
1050 mmc_hostname(host), ios->clock, ios->bus_mode,
1051 ios->power_mode, ios->chip_select, ios->vdd,
1052 ios->bus_width, ios->timing);
1054 host->ops->set_ios(host, ios);
1058 * Control chip select pin on a host.
1060 void mmc_set_chip_select(struct mmc_host *host, int mode)
1062 host->ios.chip_select = mode;
1067 * Sets the host clock to the highest possible frequency that
1070 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1072 WARN_ON(hz && hz < host->f_min);
1074 if (hz > host->f_max)
1077 host->ios.clock = hz;
1081 int mmc_execute_tuning(struct mmc_card *card)
1083 struct mmc_host *host = card->host;
1087 if (!host->ops->execute_tuning)
1090 if (mmc_card_mmc(card))
1091 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1093 opcode = MMC_SEND_TUNING_BLOCK;
1095 err = host->ops->execute_tuning(host, opcode);
1098 pr_err("%s: tuning execution failed\n", mmc_hostname(host));
1100 mmc_retune_enable(host);
1106 * Change the bus mode (open drain/push-pull) of a host.
1108 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1110 host->ios.bus_mode = mode;
1115 * Change data bus width of a host.
1117 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1119 host->ios.bus_width = width;
1124 * Set initial state after a power cycle or a hw_reset.
1126 void mmc_set_initial_state(struct mmc_host *host)
1128 mmc_retune_disable(host);
1130 if (mmc_host_is_spi(host))
1131 host->ios.chip_select = MMC_CS_HIGH;
1133 host->ios.chip_select = MMC_CS_DONTCARE;
1134 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1135 host->ios.bus_width = MMC_BUS_WIDTH_1;
1136 host->ios.timing = MMC_TIMING_LEGACY;
1137 host->ios.drv_type = 0;
1143 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1144 * @vdd: voltage (mV)
1145 * @low_bits: prefer low bits in boundary cases
1147 * This function returns the OCR bit number according to the provided @vdd
1148 * value. If conversion is not possible a negative errno value returned.
1150 * Depending on the @low_bits flag the function prefers low or high OCR bits
1151 * on boundary voltages. For example,
1152 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1153 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1155 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1157 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1159 const int max_bit = ilog2(MMC_VDD_35_36);
1162 if (vdd < 1650 || vdd > 3600)
1165 if (vdd >= 1650 && vdd <= 1950)
1166 return ilog2(MMC_VDD_165_195);
1171 /* Base 2000 mV, step 100 mV, bit's base 8. */
1172 bit = (vdd - 2000) / 100 + 8;
1179 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1180 * @vdd_min: minimum voltage value (mV)
1181 * @vdd_max: maximum voltage value (mV)
1183 * This function returns the OCR mask bits according to the provided @vdd_min
1184 * and @vdd_max values. If conversion is not possible the function returns 0.
1186 * Notes wrt boundary cases:
1187 * This function sets the OCR bits for all boundary voltages, for example
1188 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1189 * MMC_VDD_34_35 mask.
1191 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1195 if (vdd_max < vdd_min)
1198 /* Prefer high bits for the boundary vdd_max values. */
1199 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1203 /* Prefer low bits for the boundary vdd_min values. */
1204 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1208 /* Fill the mask, from max bit to min bit. */
1209 while (vdd_max >= vdd_min)
1210 mask |= 1 << vdd_max--;
1214 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1219 * mmc_of_parse_voltage - return mask of supported voltages
1220 * @np: The device node need to be parsed.
1221 * @mask: mask of voltages available for MMC/SD/SDIO
1223 * 1. Return zero on success.
1224 * 2. Return negative errno: voltage-range is invalid.
1226 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1228 const u32 *voltage_ranges;
1231 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1232 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1233 if (!voltage_ranges || !num_ranges) {
1234 pr_info("%s: voltage-ranges unspecified\n", np->full_name);
1238 for (i = 0; i < num_ranges; i++) {
1239 const int j = i * 2;
1242 ocr_mask = mmc_vddrange_to_ocrmask(
1243 be32_to_cpu(voltage_ranges[j]),
1244 be32_to_cpu(voltage_ranges[j + 1]));
1246 pr_err("%s: voltage-range #%d is invalid\n",
1255 EXPORT_SYMBOL(mmc_of_parse_voltage);
1257 #endif /* CONFIG_OF */
1259 static int mmc_of_get_func_num(struct device_node *node)
1264 ret = of_property_read_u32(node, "reg", ®);
1271 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1274 struct device_node *node;
1276 if (!host->parent || !host->parent->of_node)
1279 for_each_child_of_node(host->parent->of_node, node) {
1280 if (mmc_of_get_func_num(node) == func_num)
1287 #ifdef CONFIG_REGULATOR
1290 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1291 * @vdd_bit: OCR bit number
1292 * @min_uV: minimum voltage value (mV)
1293 * @max_uV: maximum voltage value (mV)
1295 * This function returns the voltage range according to the provided OCR
1296 * bit number. If conversion is not possible a negative errno value returned.
1298 static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1306 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1307 * bits this regulator doesn't quite support ... don't
1308 * be too picky, most cards and regulators are OK with
1309 * a 0.1V range goof (it's a small error percentage).
1311 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1313 *min_uV = 1650 * 1000;
1314 *max_uV = 1950 * 1000;
1316 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1317 *max_uV = *min_uV + 100 * 1000;
1324 * mmc_regulator_get_ocrmask - return mask of supported voltages
1325 * @supply: regulator to use
1327 * This returns either a negative errno, or a mask of voltages that
1328 * can be provided to MMC/SD/SDIO devices using the specified voltage
1329 * regulator. This would normally be called before registering the
1332 int mmc_regulator_get_ocrmask(struct regulator *supply)
1340 count = regulator_count_voltages(supply);
1344 for (i = 0; i < count; i++) {
1345 vdd_uV = regulator_list_voltage(supply, i);
1349 vdd_mV = vdd_uV / 1000;
1350 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1354 vdd_uV = regulator_get_voltage(supply);
1358 vdd_mV = vdd_uV / 1000;
1359 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1364 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1367 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1368 * @mmc: the host to regulate
1369 * @supply: regulator to use
1370 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1372 * Returns zero on success, else negative errno.
1374 * MMC host drivers may use this to enable or disable a regulator using
1375 * a particular supply voltage. This would normally be called from the
1378 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1379 struct regulator *supply,
1380 unsigned short vdd_bit)
1386 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1388 result = regulator_set_voltage(supply, min_uV, max_uV);
1389 if (result == 0 && !mmc->regulator_enabled) {
1390 result = regulator_enable(supply);
1392 mmc->regulator_enabled = true;
1394 } else if (mmc->regulator_enabled) {
1395 result = regulator_disable(supply);
1397 mmc->regulator_enabled = false;
1401 dev_err(mmc_dev(mmc),
1402 "could not set regulator OCR (%d)\n", result);
1405 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1407 static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1408 int min_uV, int target_uV,
1412 * Check if supported first to avoid errors since we may try several
1413 * signal levels during power up and don't want to show errors.
1415 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1418 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1423 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1425 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1426 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1427 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1428 * SD card spec also define VQMMC in terms of VMMC.
1429 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1431 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1432 * requested voltage. This is definitely a good idea for UHS where there's a
1433 * separate regulator on the card that's trying to make 1.8V and it's best if
1436 * This function is expected to be used by a controller's
1437 * start_signal_voltage_switch() function.
1439 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1441 struct device *dev = mmc_dev(mmc);
1442 int ret, volt, min_uV, max_uV;
1444 /* If no vqmmc supply then we can't change the voltage */
1445 if (IS_ERR(mmc->supply.vqmmc))
1448 switch (ios->signal_voltage) {
1449 case MMC_SIGNAL_VOLTAGE_120:
1450 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1451 1100000, 1200000, 1300000);
1452 case MMC_SIGNAL_VOLTAGE_180:
1453 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1454 1700000, 1800000, 1950000);
1455 case MMC_SIGNAL_VOLTAGE_330:
1456 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1460 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1461 __func__, volt, max_uV);
1463 min_uV = max(volt - 300000, 2700000);
1464 max_uV = min(max_uV + 200000, 3600000);
1467 * Due to a limitation in the current implementation of
1468 * regulator_set_voltage_triplet() which is taking the lowest
1469 * voltage possible if below the target, search for a suitable
1470 * voltage in two steps and try to stay close to vmmc
1471 * with a 0.3V tolerance at first.
1473 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1474 min_uV, volt, max_uV))
1477 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1478 2700000, volt, 3600000);
1483 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1485 #endif /* CONFIG_REGULATOR */
1487 int mmc_regulator_get_supply(struct mmc_host *mmc)
1489 struct device *dev = mmc_dev(mmc);
1492 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1493 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1495 if (IS_ERR(mmc->supply.vmmc)) {
1496 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1497 return -EPROBE_DEFER;
1498 dev_info(dev, "No vmmc regulator found\n");
1500 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1502 mmc->ocr_avail = ret;
1504 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1507 if (IS_ERR(mmc->supply.vqmmc)) {
1508 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1509 return -EPROBE_DEFER;
1510 dev_info(dev, "No vqmmc regulator found\n");
1515 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1518 * Mask off any voltages we don't support and select
1519 * the lowest voltage
1521 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1526 * Sanity check the voltages that the card claims to
1530 dev_warn(mmc_dev(host),
1531 "card claims to support voltages below defined range\n");
1535 ocr &= host->ocr_avail;
1537 dev_warn(mmc_dev(host), "no support for card's volts\n");
1541 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1544 mmc_power_cycle(host, ocr);
1548 if (bit != host->ios.vdd)
1549 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1555 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1558 int old_signal_voltage = host->ios.signal_voltage;
1560 host->ios.signal_voltage = signal_voltage;
1561 if (host->ops->start_signal_voltage_switch)
1562 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1565 host->ios.signal_voltage = old_signal_voltage;
1571 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1573 struct mmc_command cmd = {0};
1580 * Send CMD11 only if the request is to switch the card to
1583 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1584 return __mmc_set_signal_voltage(host, signal_voltage);
1587 * If we cannot switch voltages, return failure so the caller
1588 * can continue without UHS mode
1590 if (!host->ops->start_signal_voltage_switch)
1592 if (!host->ops->card_busy)
1593 pr_warn("%s: cannot verify signal voltage switch\n",
1594 mmc_hostname(host));
1596 cmd.opcode = SD_SWITCH_VOLTAGE;
1598 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1600 err = mmc_wait_for_cmd(host, &cmd, 0);
1604 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1608 * The card should drive cmd and dat[0:3] low immediately
1609 * after the response of cmd11, but wait 1 ms to be sure
1612 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1617 * During a signal voltage level switch, the clock must be gated
1618 * for 5 ms according to the SD spec
1620 clock = host->ios.clock;
1621 host->ios.clock = 0;
1624 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1626 * Voltages may not have been switched, but we've already
1627 * sent CMD11, so a power cycle is required anyway
1633 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1635 host->ios.clock = clock;
1638 /* Wait for at least 1 ms according to spec */
1642 * Failure to switch is indicated by the card holding
1645 if (host->ops->card_busy && host->ops->card_busy(host))
1650 pr_debug("%s: Signal voltage switch failed, "
1651 "power cycling card\n", mmc_hostname(host));
1652 mmc_power_cycle(host, ocr);
1659 * Select timing parameters for host.
1661 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1663 host->ios.timing = timing;
1668 * Select appropriate driver type for host.
1670 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1672 host->ios.drv_type = drv_type;
1676 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1677 int card_drv_type, int *drv_type)
1679 struct mmc_host *host = card->host;
1680 int host_drv_type = SD_DRIVER_TYPE_B;
1684 if (!host->ops->select_drive_strength)
1687 /* Use SD definition of driver strength for hosts */
1688 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1689 host_drv_type |= SD_DRIVER_TYPE_A;
1691 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1692 host_drv_type |= SD_DRIVER_TYPE_C;
1694 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1695 host_drv_type |= SD_DRIVER_TYPE_D;
1698 * The drive strength that the hardware can support
1699 * depends on the board design. Pass the appropriate
1700 * information and let the hardware specific code
1701 * return what is possible given the options
1703 return host->ops->select_drive_strength(card, max_dtr,
1710 * Apply power to the MMC stack. This is a two-stage process.
1711 * First, we enable power to the card without the clock running.
1712 * We then wait a bit for the power to stabilise. Finally,
1713 * enable the bus drivers and clock to the card.
1715 * We must _NOT_ enable the clock prior to power stablising.
1717 * If a host does all the power sequencing itself, ignore the
1718 * initial MMC_POWER_UP stage.
1720 void mmc_power_up(struct mmc_host *host, u32 ocr)
1722 if (host->ios.power_mode == MMC_POWER_ON)
1725 mmc_pwrseq_pre_power_on(host);
1727 host->ios.vdd = fls(ocr) - 1;
1728 host->ios.power_mode = MMC_POWER_UP;
1729 /* Set initial state and call mmc_set_ios */
1730 mmc_set_initial_state(host);
1732 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1733 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1734 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1735 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1736 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1737 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1738 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1741 * This delay should be sufficient to allow the power supply
1742 * to reach the minimum voltage.
1746 mmc_pwrseq_post_power_on(host);
1748 host->ios.clock = host->f_init;
1750 host->ios.power_mode = MMC_POWER_ON;
1754 * This delay must be at least 74 clock sizes, or 1 ms, or the
1755 * time required to reach a stable voltage.
1760 void mmc_power_off(struct mmc_host *host)
1762 if (host->ios.power_mode == MMC_POWER_OFF)
1765 mmc_pwrseq_power_off(host);
1767 host->ios.clock = 0;
1770 host->ios.power_mode = MMC_POWER_OFF;
1771 /* Set initial state and call mmc_set_ios */
1772 mmc_set_initial_state(host);
1775 * Some configurations, such as the 802.11 SDIO card in the OLPC
1776 * XO-1.5, require a short delay after poweroff before the card
1777 * can be successfully turned on again.
1782 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1784 mmc_power_off(host);
1785 /* Wait at least 1 ms according to SD spec */
1787 mmc_power_up(host, ocr);
1791 * Cleanup when the last reference to the bus operator is dropped.
1793 static void __mmc_release_bus(struct mmc_host *host)
1796 BUG_ON(host->bus_refs);
1797 BUG_ON(!host->bus_dead);
1799 host->bus_ops = NULL;
1803 * Increase reference count of bus operator
1805 static inline void mmc_bus_get(struct mmc_host *host)
1807 unsigned long flags;
1809 spin_lock_irqsave(&host->lock, flags);
1811 spin_unlock_irqrestore(&host->lock, flags);
1815 * Decrease reference count of bus operator and free it if
1816 * it is the last reference.
1818 static inline void mmc_bus_put(struct mmc_host *host)
1820 unsigned long flags;
1822 spin_lock_irqsave(&host->lock, flags);
1824 if ((host->bus_refs == 0) && host->bus_ops)
1825 __mmc_release_bus(host);
1826 spin_unlock_irqrestore(&host->lock, flags);
1830 * Assign a mmc bus handler to a host. Only one bus handler may control a
1831 * host at any given time.
1833 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1835 unsigned long flags;
1840 WARN_ON(!host->claimed);
1842 spin_lock_irqsave(&host->lock, flags);
1844 BUG_ON(host->bus_ops);
1845 BUG_ON(host->bus_refs);
1847 host->bus_ops = ops;
1851 spin_unlock_irqrestore(&host->lock, flags);
1855 * Remove the current bus handler from a host.
1857 void mmc_detach_bus(struct mmc_host *host)
1859 unsigned long flags;
1863 WARN_ON(!host->claimed);
1864 WARN_ON(!host->bus_ops);
1866 spin_lock_irqsave(&host->lock, flags);
1870 spin_unlock_irqrestore(&host->lock, flags);
1875 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1878 #ifdef CONFIG_MMC_DEBUG
1879 unsigned long flags;
1880 spin_lock_irqsave(&host->lock, flags);
1881 WARN_ON(host->removed);
1882 spin_unlock_irqrestore(&host->lock, flags);
1886 * If the device is configured as wakeup, we prevent a new sleep for
1887 * 5 s to give provision for user space to consume the event.
1889 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1890 device_can_wakeup(mmc_dev(host)))
1891 pm_wakeup_event(mmc_dev(host), 5000);
1893 host->detect_change = 1;
1894 mmc_schedule_delayed_work(&host->detect, delay);
1898 * mmc_detect_change - process change of state on a MMC socket
1899 * @host: host which changed state.
1900 * @delay: optional delay to wait before detection (jiffies)
1902 * MMC drivers should call this when they detect a card has been
1903 * inserted or removed. The MMC layer will confirm that any
1904 * present card is still functional, and initialize any newly
1907 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1909 _mmc_detect_change(host, delay, true);
1911 EXPORT_SYMBOL(mmc_detect_change);
1913 void mmc_init_erase(struct mmc_card *card)
1917 if (is_power_of_2(card->erase_size))
1918 card->erase_shift = ffs(card->erase_size) - 1;
1920 card->erase_shift = 0;
1923 * It is possible to erase an arbitrarily large area of an SD or MMC
1924 * card. That is not desirable because it can take a long time
1925 * (minutes) potentially delaying more important I/O, and also the
1926 * timeout calculations become increasingly hugely over-estimated.
1927 * Consequently, 'pref_erase' is defined as a guide to limit erases
1928 * to that size and alignment.
1930 * For SD cards that define Allocation Unit size, limit erases to one
1931 * Allocation Unit at a time. For MMC cards that define High Capacity
1932 * Erase Size, whether it is switched on or not, limit to that size.
1933 * Otherwise just have a stab at a good value. For modern cards it
1934 * will end up being 4MiB. Note that if the value is too small, it
1935 * can end up taking longer to erase.
1937 if (mmc_card_sd(card) && card->ssr.au) {
1938 card->pref_erase = card->ssr.au;
1939 card->erase_shift = ffs(card->ssr.au) - 1;
1940 } else if (card->ext_csd.hc_erase_size) {
1941 card->pref_erase = card->ext_csd.hc_erase_size;
1942 } else if (card->erase_size) {
1943 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1945 card->pref_erase = 512 * 1024 / 512;
1947 card->pref_erase = 1024 * 1024 / 512;
1949 card->pref_erase = 2 * 1024 * 1024 / 512;
1951 card->pref_erase = 4 * 1024 * 1024 / 512;
1952 if (card->pref_erase < card->erase_size)
1953 card->pref_erase = card->erase_size;
1955 sz = card->pref_erase % card->erase_size;
1957 card->pref_erase += card->erase_size - sz;
1960 card->pref_erase = 0;
1963 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1964 unsigned int arg, unsigned int qty)
1966 unsigned int erase_timeout;
1968 if (arg == MMC_DISCARD_ARG ||
1969 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1970 erase_timeout = card->ext_csd.trim_timeout;
1971 } else if (card->ext_csd.erase_group_def & 1) {
1972 /* High Capacity Erase Group Size uses HC timeouts */
1973 if (arg == MMC_TRIM_ARG)
1974 erase_timeout = card->ext_csd.trim_timeout;
1976 erase_timeout = card->ext_csd.hc_erase_timeout;
1978 /* CSD Erase Group Size uses write timeout */
1979 unsigned int mult = (10 << card->csd.r2w_factor);
1980 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1981 unsigned int timeout_us;
1983 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1984 if (card->csd.tacc_ns < 1000000)
1985 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1987 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1990 * ios.clock is only a target. The real clock rate might be
1991 * less but not that much less, so fudge it by multiplying by 2.
1994 timeout_us += (timeout_clks * 1000) /
1995 (card->host->ios.clock / 1000);
1997 erase_timeout = timeout_us / 1000;
2000 * Theoretically, the calculation could underflow so round up
2001 * to 1ms in that case.
2007 /* Multiplier for secure operations */
2008 if (arg & MMC_SECURE_ARGS) {
2009 if (arg == MMC_SECURE_ERASE_ARG)
2010 erase_timeout *= card->ext_csd.sec_erase_mult;
2012 erase_timeout *= card->ext_csd.sec_trim_mult;
2015 erase_timeout *= qty;
2018 * Ensure at least a 1 second timeout for SPI as per
2019 * 'mmc_set_data_timeout()'
2021 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2022 erase_timeout = 1000;
2024 return erase_timeout;
2027 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2031 unsigned int erase_timeout;
2033 if (card->ssr.erase_timeout) {
2034 /* Erase timeout specified in SD Status Register (SSR) */
2035 erase_timeout = card->ssr.erase_timeout * qty +
2036 card->ssr.erase_offset;
2039 * Erase timeout not specified in SD Status Register (SSR) so
2040 * use 250ms per write block.
2042 erase_timeout = 250 * qty;
2045 /* Must not be less than 1 second */
2046 if (erase_timeout < 1000)
2047 erase_timeout = 1000;
2049 return erase_timeout;
2052 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2056 if (mmc_card_sd(card))
2057 return mmc_sd_erase_timeout(card, arg, qty);
2059 return mmc_mmc_erase_timeout(card, arg, qty);
2062 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2063 unsigned int to, unsigned int arg)
2065 struct mmc_command cmd = {0};
2066 unsigned int qty = 0;
2067 unsigned long timeout;
2068 unsigned int fr, nr;
2073 trace_mmc_blk_erase_start(arg, fr, nr);
2075 mmc_retune_hold(card->host);
2078 * qty is used to calculate the erase timeout which depends on how many
2079 * erase groups (or allocation units in SD terminology) are affected.
2080 * We count erasing part of an erase group as one erase group.
2081 * For SD, the allocation units are always a power of 2. For MMC, the
2082 * erase group size is almost certainly also power of 2, but it does not
2083 * seem to insist on that in the JEDEC standard, so we fall back to
2084 * division in that case. SD may not specify an allocation unit size,
2085 * in which case the timeout is based on the number of write blocks.
2087 * Note that the timeout for secure trim 2 will only be correct if the
2088 * number of erase groups specified is the same as the total of all
2089 * preceding secure trim 1 commands. Since the power may have been
2090 * lost since the secure trim 1 commands occurred, it is generally
2091 * impossible to calculate the secure trim 2 timeout correctly.
2093 if (card->erase_shift)
2094 qty += ((to >> card->erase_shift) -
2095 (from >> card->erase_shift)) + 1;
2096 else if (mmc_card_sd(card))
2097 qty += to - from + 1;
2099 qty += ((to / card->erase_size) -
2100 (from / card->erase_size)) + 1;
2102 if (!mmc_card_blockaddr(card)) {
2107 if (mmc_card_sd(card))
2108 cmd.opcode = SD_ERASE_WR_BLK_START;
2110 cmd.opcode = MMC_ERASE_GROUP_START;
2112 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2113 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2115 pr_err("mmc_erase: group start error %d, "
2116 "status %#x\n", err, cmd.resp[0]);
2121 memset(&cmd, 0, sizeof(struct mmc_command));
2122 if (mmc_card_sd(card))
2123 cmd.opcode = SD_ERASE_WR_BLK_END;
2125 cmd.opcode = MMC_ERASE_GROUP_END;
2127 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2128 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2130 pr_err("mmc_erase: group end error %d, status %#x\n",
2136 memset(&cmd, 0, sizeof(struct mmc_command));
2137 cmd.opcode = MMC_ERASE;
2139 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2140 cmd.busy_timeout = mmc_erase_timeout(card, arg, qty);
2141 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2143 pr_err("mmc_erase: erase error %d, status %#x\n",
2149 if (mmc_host_is_spi(card->host))
2152 timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
2154 memset(&cmd, 0, sizeof(struct mmc_command));
2155 cmd.opcode = MMC_SEND_STATUS;
2156 cmd.arg = card->rca << 16;
2157 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2158 /* Do not retry else we can't see errors */
2159 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2160 if (err || (cmd.resp[0] & 0xFDF92000)) {
2161 pr_err("error %d requesting status %#x\n",
2167 /* Timeout if the device never becomes ready for data and
2168 * never leaves the program state.
2170 if (time_after(jiffies, timeout)) {
2171 pr_err("%s: Card stuck in programming state! %s\n",
2172 mmc_hostname(card->host), __func__);
2177 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2178 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2180 mmc_retune_release(card->host);
2181 trace_mmc_blk_erase_end(arg, fr, nr);
2186 * mmc_erase - erase sectors.
2187 * @card: card to erase
2188 * @from: first sector to erase
2189 * @nr: number of sectors to erase
2190 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2192 * Caller must claim host before calling this function.
2194 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2197 unsigned int rem, to = from + nr;
2200 if (!(card->host->caps & MMC_CAP_ERASE) ||
2201 !(card->csd.cmdclass & CCC_ERASE))
2204 if (!card->erase_size)
2207 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2210 if ((arg & MMC_SECURE_ARGS) &&
2211 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2214 if ((arg & MMC_TRIM_ARGS) &&
2215 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2218 if (arg == MMC_SECURE_ERASE_ARG) {
2219 if (from % card->erase_size || nr % card->erase_size)
2223 if (arg == MMC_ERASE_ARG) {
2224 rem = from % card->erase_size;
2226 rem = card->erase_size - rem;
2233 rem = nr % card->erase_size;
2246 /* 'from' and 'to' are inclusive */
2250 * Special case where only one erase-group fits in the timeout budget:
2251 * If the region crosses an erase-group boundary on this particular
2252 * case, we will be trimming more than one erase-group which, does not
2253 * fit in the timeout budget of the controller, so we need to split it
2254 * and call mmc_do_erase() twice if necessary. This special case is
2255 * identified by the card->eg_boundary flag.
2257 rem = card->erase_size - (from % card->erase_size);
2258 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2259 err = mmc_do_erase(card, from, from + rem - 1, arg);
2261 if ((err) || (to <= from))
2265 return mmc_do_erase(card, from, to, arg);
2267 EXPORT_SYMBOL(mmc_erase);
2269 int mmc_can_erase(struct mmc_card *card)
2271 if ((card->host->caps & MMC_CAP_ERASE) &&
2272 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2276 EXPORT_SYMBOL(mmc_can_erase);
2278 int mmc_can_trim(struct mmc_card *card)
2280 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2281 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2285 EXPORT_SYMBOL(mmc_can_trim);
2287 int mmc_can_discard(struct mmc_card *card)
2290 * As there's no way to detect the discard support bit at v4.5
2291 * use the s/w feature support filed.
2293 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2297 EXPORT_SYMBOL(mmc_can_discard);
2299 int mmc_can_sanitize(struct mmc_card *card)
2301 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2303 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2307 EXPORT_SYMBOL(mmc_can_sanitize);
2309 int mmc_can_secure_erase_trim(struct mmc_card *card)
2311 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2312 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2316 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2318 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2321 if (!card->erase_size)
2323 if (from % card->erase_size || nr % card->erase_size)
2327 EXPORT_SYMBOL(mmc_erase_group_aligned);
2329 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2332 struct mmc_host *host = card->host;
2333 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
2334 unsigned int last_timeout = 0;
2336 if (card->erase_shift)
2337 max_qty = UINT_MAX >> card->erase_shift;
2338 else if (mmc_card_sd(card))
2341 max_qty = UINT_MAX / card->erase_size;
2343 /* Find the largest qty with an OK timeout */
2346 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2347 timeout = mmc_erase_timeout(card, arg, qty + x);
2348 if (timeout > host->max_busy_timeout)
2350 if (timeout < last_timeout)
2352 last_timeout = timeout;
2362 * When specifying a sector range to trim, chances are we might cross
2363 * an erase-group boundary even if the amount of sectors is less than
2365 * If we can only fit one erase-group in the controller timeout budget,
2366 * we have to care that erase-group boundaries are not crossed by a
2367 * single trim operation. We flag that special case with "eg_boundary".
2368 * In all other cases we can just decrement qty and pretend that we
2369 * always touch (qty + 1) erase-groups as a simple optimization.
2372 card->eg_boundary = 1;
2376 /* Convert qty to sectors */
2377 if (card->erase_shift)
2378 max_discard = qty << card->erase_shift;
2379 else if (mmc_card_sd(card))
2380 max_discard = qty + 1;
2382 max_discard = qty * card->erase_size;
2387 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2389 struct mmc_host *host = card->host;
2390 unsigned int max_discard, max_trim;
2392 if (!host->max_busy_timeout)
2396 * Without erase_group_def set, MMC erase timeout depends on clock
2397 * frequence which can change. In that case, the best choice is
2398 * just the preferred erase size.
2400 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2401 return card->pref_erase;
2403 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2404 if (mmc_can_trim(card)) {
2405 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2406 if (max_trim < max_discard)
2407 max_discard = max_trim;
2408 } else if (max_discard < card->erase_size) {
2411 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2412 mmc_hostname(host), max_discard, host->max_busy_timeout);
2415 EXPORT_SYMBOL(mmc_calc_max_discard);
2417 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2419 struct mmc_command cmd = {0};
2421 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card))
2424 cmd.opcode = MMC_SET_BLOCKLEN;
2426 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2427 return mmc_wait_for_cmd(card->host, &cmd, 5);
2429 EXPORT_SYMBOL(mmc_set_blocklen);
2431 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2434 struct mmc_command cmd = {0};
2436 cmd.opcode = MMC_SET_BLOCK_COUNT;
2437 cmd.arg = blockcount & 0x0000FFFF;
2440 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2441 return mmc_wait_for_cmd(card->host, &cmd, 5);
2443 EXPORT_SYMBOL(mmc_set_blockcount);
2445 static void mmc_hw_reset_for_init(struct mmc_host *host)
2447 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2449 host->ops->hw_reset(host);
2452 int mmc_hw_reset(struct mmc_host *host)
2460 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2465 ret = host->bus_ops->reset(host);
2468 if (ret != -EOPNOTSUPP)
2469 pr_warn("%s: tried to reset card\n", mmc_hostname(host));
2473 EXPORT_SYMBOL(mmc_hw_reset);
2475 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2477 host->f_init = freq;
2479 #ifdef CONFIG_MMC_DEBUG
2480 pr_info("%s: %s: trying to init card at %u Hz\n",
2481 mmc_hostname(host), __func__, host->f_init);
2483 mmc_power_up(host, host->ocr_avail);
2486 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2487 * do a hardware reset if possible.
2489 mmc_hw_reset_for_init(host);
2492 * sdio_reset sends CMD52 to reset card. Since we do not know
2493 * if the card is being re-initialized, just send it. CMD52
2494 * should be ignored by SD/eMMC cards.
2496 #ifdef MMC_STANDARD_PROBE
2500 mmc_send_if_cond(host, host->ocr_avail);
2502 /* Order's important: probe SDIO, then SD, then MMC */
2503 if (!mmc_attach_sdio(host))
2505 if (!mmc_attach_sd(host))
2507 if (!mmc_attach_mmc(host))
2510 if (host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
2515 if (host->restrict_caps &
2516 (RESTRICT_CARD_TYPE_SDIO | RESTRICT_CARD_TYPE_SD))
2517 mmc_send_if_cond(host, host->ocr_avail);
2518 /* Order's important: probe SDIO, then SD, then MMC */
2519 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) &&
2520 !mmc_attach_sdio(host))
2522 if ((host->restrict_caps & RESTRICT_CARD_TYPE_SD) &&
2523 !mmc_attach_sd(host))
2525 if ((host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) &&
2526 !mmc_attach_mmc(host))
2529 mmc_power_off(host);
2533 int _mmc_detect_card_removed(struct mmc_host *host)
2537 if (host->caps & MMC_CAP_NONREMOVABLE)
2540 if (!host->card || mmc_card_removed(host->card))
2543 ret = host->bus_ops->alive(host);
2546 * Card detect status and alive check may be out of sync if card is
2547 * removed slowly, when card detect switch changes while card/slot
2548 * pads are still contacted in hardware (refer to "SD Card Mechanical
2549 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2550 * detect work 200ms later for this case.
2552 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2553 mmc_detect_change(host, msecs_to_jiffies(200));
2554 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2558 mmc_card_set_removed(host->card);
2559 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2565 int mmc_detect_card_removed(struct mmc_host *host)
2567 struct mmc_card *card = host->card;
2570 WARN_ON(!host->claimed);
2575 ret = mmc_card_removed(card);
2577 * The card will be considered unchanged unless we have been asked to
2578 * detect a change or host requires polling to provide card detection.
2580 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2583 host->detect_change = 0;
2585 ret = _mmc_detect_card_removed(host);
2586 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2588 * Schedule a detect work as soon as possible to let a
2589 * rescan handle the card removal.
2591 cancel_delayed_work(&host->detect);
2592 _mmc_detect_change(host, 0, false);
2598 EXPORT_SYMBOL(mmc_detect_card_removed);
2600 void mmc_rescan(struct work_struct *work)
2602 struct mmc_host *host =
2603 container_of(work, struct mmc_host, detect.work);
2605 bool extend_wakelock = false;
2607 if (host->trigger_card_event && host->ops->card_event) {
2608 host->ops->card_event(host);
2609 host->trigger_card_event = false;
2612 if (host->rescan_disable)
2615 /* If there is a non-removable card registered, only scan once */
2616 if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
2618 host->rescan_entered = 1;
2623 * if there is a _removable_ card registered, check whether it is
2626 if (host->bus_ops && !host->bus_dead
2627 && !(host->caps & MMC_CAP_NONREMOVABLE))
2628 host->bus_ops->detect(host);
2630 host->detect_change = 0;
2632 /* If the card was removed the bus will be marked
2633 * as dead - extend the wakelock so userspace
2636 extend_wakelock = 1;
2639 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2640 * the card is no longer present.
2645 /* if there still is a card present, stop here */
2646 if (host->bus_ops != NULL) {
2652 * Only we can add a new handler, so it's safe to
2653 * release the lock here.
2657 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
2658 host->ops->get_cd(host) == 0) {
2659 mmc_claim_host(host);
2660 mmc_power_off(host);
2661 mmc_release_host(host);
2665 mmc_claim_host(host);
2666 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2667 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min))) {
2668 extend_wakelock = true;
2671 if (freqs[i] <= host->f_min)
2674 mmc_release_host(host);
2677 if (extend_wakelock)
2678 wake_lock_timeout(&mmc_delayed_work_wake_lock, HZ / 2);
2680 wake_unlock(&mmc_delayed_work_wake_lock);
2681 if (host->caps & MMC_CAP_NEEDS_POLL)
2682 mmc_schedule_delayed_work(&host->detect, HZ);
2685 void mmc_start_host(struct mmc_host *host)
2687 host->f_init = max(freqs[0], host->f_min);
2688 host->rescan_disable = 0;
2689 host->ios.power_mode = MMC_POWER_UNDEFINED;
2691 mmc_claim_host(host);
2692 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2693 mmc_power_off(host);
2695 mmc_power_up(host, host->ocr_avail);
2696 mmc_release_host(host);
2698 mmc_gpiod_request_cd_irq(host);
2699 _mmc_detect_change(host, 0, false);
2702 void mmc_stop_host(struct mmc_host *host)
2704 #ifdef CONFIG_MMC_DEBUG
2705 unsigned long flags;
2706 spin_lock_irqsave(&host->lock, flags);
2708 spin_unlock_irqrestore(&host->lock, flags);
2710 if (host->slot.cd_irq >= 0)
2711 disable_irq(host->slot.cd_irq);
2713 host->rescan_disable = 1;
2714 cancel_delayed_work_sync(&host->detect);
2715 mmc_flush_scheduled_work();
2717 /* clear pm flags now and let card drivers set them as needed */
2721 if (host->bus_ops && !host->bus_dead) {
2722 /* Calling bus_ops->remove() with a claimed host can deadlock */
2723 host->bus_ops->remove(host);
2724 mmc_claim_host(host);
2725 mmc_detach_bus(host);
2726 mmc_power_off(host);
2727 mmc_release_host(host);
2735 mmc_claim_host(host);
2736 mmc_power_off(host);
2737 mmc_release_host(host);
2740 int mmc_power_save_host(struct mmc_host *host)
2744 #ifdef CONFIG_MMC_DEBUG
2745 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2750 if (!host->bus_ops || host->bus_dead) {
2755 if (host->bus_ops->power_save)
2756 ret = host->bus_ops->power_save(host);
2760 mmc_power_off(host);
2764 EXPORT_SYMBOL(mmc_power_save_host);
2766 int mmc_power_restore_host(struct mmc_host *host)
2770 #ifdef CONFIG_MMC_DEBUG
2771 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2776 if (!host->bus_ops || host->bus_dead) {
2781 mmc_power_up(host, host->card->ocr);
2782 ret = host->bus_ops->power_restore(host);
2788 EXPORT_SYMBOL(mmc_power_restore_host);
2791 * Flush the cache to the non-volatile storage.
2793 int mmc_flush_cache(struct mmc_card *card)
2797 if (mmc_card_mmc(card) &&
2798 (card->ext_csd.cache_size > 0) &&
2799 (card->ext_csd.cache_ctrl & 1)) {
2800 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2801 EXT_CSD_FLUSH_CACHE, 1, 0);
2803 pr_err("%s: cache flush error %d\n",
2804 mmc_hostname(card->host), err);
2809 EXPORT_SYMBOL(mmc_flush_cache);
2813 /* Do the card removal on suspend if card is assumed removeable
2814 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2817 int mmc_pm_notify(struct notifier_block *notify_block,
2818 unsigned long mode, void *unused)
2820 struct mmc_host *host = container_of(
2821 notify_block, struct mmc_host, pm_notify);
2822 unsigned long flags;
2826 case PM_HIBERNATION_PREPARE:
2827 case PM_SUSPEND_PREPARE:
2828 case PM_RESTORE_PREPARE:
2829 spin_lock_irqsave(&host->lock, flags);
2830 host->rescan_disable = 1;
2831 spin_unlock_irqrestore(&host->lock, flags);
2832 cancel_delayed_work_sync(&host->detect);
2837 /* Validate prerequisites for suspend */
2838 if (host->bus_ops->pre_suspend)
2839 err = host->bus_ops->pre_suspend(host);
2843 /* Calling bus_ops->remove() with a claimed host can deadlock */
2844 host->bus_ops->remove(host);
2845 mmc_claim_host(host);
2846 mmc_detach_bus(host);
2847 mmc_power_off(host);
2848 mmc_release_host(host);
2852 case PM_POST_SUSPEND:
2853 case PM_POST_HIBERNATION:
2854 case PM_POST_RESTORE:
2856 spin_lock_irqsave(&host->lock, flags);
2857 host->rescan_disable = 0;
2858 spin_unlock_irqrestore(&host->lock, flags);
2859 _mmc_detect_change(host, 0, false);
2868 * mmc_init_context_info() - init synchronization context
2871 * Init struct context_info needed to implement asynchronous
2872 * request mechanism, used by mmc core, host driver and mmc requests
2875 void mmc_init_context_info(struct mmc_host *host)
2877 spin_lock_init(&host->context_info.lock);
2878 host->context_info.is_new_req = false;
2879 host->context_info.is_done_rcv = false;
2880 host->context_info.is_waiting_last_req = false;
2881 init_waitqueue_head(&host->context_info.wait);
2884 #ifdef CONFIG_MMC_EMBEDDED_SDIO
2885 void mmc_set_embedded_sdio_data(struct mmc_host *host,
2886 struct sdio_cis *cis,
2887 struct sdio_cccr *cccr,
2888 struct sdio_embedded_func *funcs,
2891 host->embedded_sdio_data.cis = cis;
2892 host->embedded_sdio_data.cccr = cccr;
2893 host->embedded_sdio_data.funcs = funcs;
2894 host->embedded_sdio_data.num_funcs = num_funcs;
2897 EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
2900 static int __init mmc_init(void)
2904 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2908 wake_lock_init(&mmc_delayed_work_wake_lock, WAKE_LOCK_SUSPEND,
2909 "mmc_delayed_work");
2911 ret = mmc_register_bus();
2913 goto destroy_workqueue;
2915 ret = mmc_register_host_class();
2917 goto unregister_bus;
2919 ret = sdio_register_bus();
2921 goto unregister_host_class;
2925 unregister_host_class:
2926 mmc_unregister_host_class();
2928 mmc_unregister_bus();
2930 destroy_workqueue(workqueue);
2931 wake_lock_destroy(&mmc_delayed_work_wake_lock);
2936 static void __exit mmc_exit(void)
2938 sdio_unregister_bus();
2939 mmc_unregister_host_class();
2940 mmc_unregister_bus();
2941 destroy_workqueue(workqueue);
2942 wake_lock_destroy(&mmc_delayed_work_wake_lock);
2945 subsys_initcall(mmc_init);
2946 module_exit(mmc_exit);
2948 MODULE_LICENSE("GPL");