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>
39 #define CREATE_TRACE_POINTS
40 #include <trace/events/mmc.h>
53 /* The max erase timeout, used when host->max_busy_timeout isn't specified */
54 #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
56 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
59 * Enabling software CRCs on the data blocks can be a significant (30%)
60 * performance cost, and for other reasons may not always be desired.
61 * So we allow it it to be disabled.
64 module_param(use_spi_crc, bool, 0);
66 static int mmc_schedule_delayed_work(struct delayed_work *work,
70 * We use the system_freezable_wq, because of two reasons.
71 * First, it allows several works (not the same work item) to be
72 * executed simultaneously. Second, the queue becomes frozen when
73 * userspace becomes frozen during system PM.
75 return queue_delayed_work(system_freezable_wq, work, delay);
78 #ifdef CONFIG_FAIL_MMC_REQUEST
81 * Internal function. Inject random data errors.
82 * If mmc_data is NULL no errors are injected.
84 static void mmc_should_fail_request(struct mmc_host *host,
85 struct mmc_request *mrq)
87 struct mmc_command *cmd = mrq->cmd;
88 struct mmc_data *data = mrq->data;
89 static const int data_errors[] = {
98 if (cmd->error || data->error ||
99 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
102 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
103 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
106 #else /* CONFIG_FAIL_MMC_REQUEST */
108 static inline void mmc_should_fail_request(struct mmc_host *host,
109 struct mmc_request *mrq)
113 #endif /* CONFIG_FAIL_MMC_REQUEST */
115 static inline void mmc_complete_cmd(struct mmc_request *mrq)
117 if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
118 complete_all(&mrq->cmd_completion);
121 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
123 if (!mrq->cap_cmd_during_tfr)
126 mmc_complete_cmd(mrq);
128 pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
129 mmc_hostname(host), mrq->cmd->opcode);
131 EXPORT_SYMBOL(mmc_command_done);
134 * mmc_request_done - finish processing an MMC request
135 * @host: MMC host which completed request
136 * @mrq: MMC request which request
138 * MMC drivers should call this function when they have completed
139 * their processing of a request.
141 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
143 struct mmc_command *cmd = mrq->cmd;
144 int err = cmd->error;
146 /* Flag re-tuning needed on CRC errors */
147 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
148 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
149 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
150 (mrq->data && mrq->data->error == -EILSEQ) ||
151 (mrq->stop && mrq->stop->error == -EILSEQ)))
152 mmc_retune_needed(host);
154 if (err && cmd->retries && mmc_host_is_spi(host)) {
155 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
159 if (host->ongoing_mrq == mrq)
160 host->ongoing_mrq = NULL;
162 mmc_complete_cmd(mrq);
164 trace_mmc_request_done(host, mrq);
167 * We list various conditions for the command to be considered
170 * - There was no error, OK fine then
171 * - We are not doing some kind of retry
172 * - The card was removed (...so just complete everything no matter
173 * if there are errors or retries)
175 if (!err || !cmd->retries || mmc_card_removed(host->card)) {
176 mmc_should_fail_request(host, mrq);
178 if (!host->ongoing_mrq)
179 led_trigger_event(host->led, LED_OFF);
182 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
183 mmc_hostname(host), mrq->sbc->opcode,
185 mrq->sbc->resp[0], mrq->sbc->resp[1],
186 mrq->sbc->resp[2], mrq->sbc->resp[3]);
189 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
190 mmc_hostname(host), cmd->opcode, err,
191 cmd->resp[0], cmd->resp[1],
192 cmd->resp[2], cmd->resp[3]);
195 pr_debug("%s: %d bytes transferred: %d\n",
197 mrq->data->bytes_xfered, mrq->data->error);
201 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
202 mmc_hostname(host), mrq->stop->opcode,
204 mrq->stop->resp[0], mrq->stop->resp[1],
205 mrq->stop->resp[2], mrq->stop->resp[3]);
209 * Request starter must handle retries - see
210 * mmc_wait_for_req_done().
216 EXPORT_SYMBOL(mmc_request_done);
218 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
222 /* Assumes host controller has been runtime resumed by mmc_claim_host */
223 err = mmc_retune(host);
225 mrq->cmd->error = err;
226 mmc_request_done(host, mrq);
231 * For sdio rw commands we must wait for card busy otherwise some
232 * sdio devices won't work properly.
233 * And bypass I/O abort, reset and bus suspend operations.
235 if (sdio_is_io_busy(mrq->cmd->opcode, mrq->cmd->arg) &&
236 host->ops->card_busy) {
237 int tries = 500; /* Wait aprox 500ms at maximum */
239 while (host->ops->card_busy(host) && --tries)
243 mrq->cmd->error = -EBUSY;
244 mmc_request_done(host, mrq);
249 if (mrq->cap_cmd_during_tfr) {
250 host->ongoing_mrq = mrq;
252 * Retry path could come through here without having waiting on
253 * cmd_completion, so ensure it is reinitialised.
255 reinit_completion(&mrq->cmd_completion);
258 trace_mmc_request_start(host, mrq);
261 host->cqe_ops->cqe_off(host);
263 host->ops->request(host, mrq);
266 static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq,
270 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
271 mmc_hostname(host), mrq->sbc->opcode,
272 mrq->sbc->arg, mrq->sbc->flags);
276 pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n",
277 mmc_hostname(host), cqe ? "CQE direct " : "",
278 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
280 pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n",
281 mmc_hostname(host), mrq->tag, mrq->data->blk_addr);
285 pr_debug("%s: blksz %d blocks %d flags %08x "
286 "tsac %d ms nsac %d\n",
287 mmc_hostname(host), mrq->data->blksz,
288 mrq->data->blocks, mrq->data->flags,
289 mrq->data->timeout_ns / 1000000,
290 mrq->data->timeout_clks);
294 pr_debug("%s: CMD%u arg %08x flags %08x\n",
295 mmc_hostname(host), mrq->stop->opcode,
296 mrq->stop->arg, mrq->stop->flags);
300 static int mmc_mrq_prep(struct mmc_host *host, struct mmc_request *mrq)
302 unsigned int i, sz = 0;
303 struct scatterlist *sg;
308 mrq->cmd->data = mrq->data;
315 if (mrq->data->blksz > host->max_blk_size ||
316 mrq->data->blocks > host->max_blk_count ||
317 mrq->data->blocks * mrq->data->blksz > host->max_req_size)
320 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
322 if (sz != mrq->data->blocks * mrq->data->blksz)
325 mrq->data->error = 0;
326 mrq->data->mrq = mrq;
328 mrq->data->stop = mrq->stop;
329 mrq->stop->error = 0;
330 mrq->stop->mrq = mrq;
337 int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
341 init_completion(&mrq->cmd_completion);
343 mmc_retune_hold(host);
345 if (mmc_card_removed(host->card))
348 mmc_mrq_pr_debug(host, mrq, false);
350 WARN_ON(!host->claimed);
352 err = mmc_mrq_prep(host, mrq);
356 led_trigger_event(host->led, LED_FULL);
357 __mmc_start_request(host, mrq);
361 EXPORT_SYMBOL(mmc_start_request);
363 static void mmc_wait_done(struct mmc_request *mrq)
365 complete(&mrq->completion);
368 static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
370 struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
373 * If there is an ongoing transfer, wait for the command line to become
376 if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
377 wait_for_completion(&ongoing_mrq->cmd_completion);
380 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
384 mmc_wait_ongoing_tfr_cmd(host);
386 init_completion(&mrq->completion);
387 mrq->done = mmc_wait_done;
389 err = mmc_start_request(host, mrq);
391 mrq->cmd->error = err;
392 mmc_complete_cmd(mrq);
393 complete(&mrq->completion);
399 void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
401 struct mmc_command *cmd;
404 wait_for_completion(&mrq->completion);
409 * If host has timed out waiting for the sanitize
410 * to complete, card might be still in programming state
411 * so let's try to bring the card out of programming
414 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
415 if (!mmc_interrupt_hpi(host->card)) {
416 pr_warn("%s: %s: Interrupted sanitize\n",
417 mmc_hostname(host), __func__);
421 pr_err("%s: %s: Failed to interrupt sanitize\n",
422 mmc_hostname(host), __func__);
425 if (!cmd->error || !cmd->retries ||
426 mmc_card_removed(host->card))
429 mmc_retune_recheck(host);
431 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
432 mmc_hostname(host), cmd->opcode, cmd->error);
435 __mmc_start_request(host, mrq);
438 mmc_retune_release(host);
440 EXPORT_SYMBOL(mmc_wait_for_req_done);
443 * mmc_cqe_start_req - Start a CQE request.
444 * @host: MMC host to start the request
445 * @mrq: request to start
447 * Start the request, re-tuning if needed and it is possible. Returns an error
448 * code if the request fails to start or -EBUSY if CQE is busy.
450 int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
455 * CQE cannot process re-tuning commands. Caller must hold retuning
456 * while CQE is in use. Re-tuning can happen here only when CQE has no
457 * active requests i.e. this is the first. Note, re-tuning will call
460 err = mmc_retune(host);
466 mmc_mrq_pr_debug(host, mrq, true);
468 err = mmc_mrq_prep(host, mrq);
472 err = host->cqe_ops->cqe_request(host, mrq);
476 trace_mmc_request_start(host, mrq);
482 pr_debug("%s: failed to start CQE direct CMD%u, error %d\n",
483 mmc_hostname(host), mrq->cmd->opcode, err);
485 pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n",
486 mmc_hostname(host), mrq->tag, err);
490 EXPORT_SYMBOL(mmc_cqe_start_req);
493 * mmc_cqe_request_done - CQE has finished processing an MMC request
494 * @host: MMC host which completed request
495 * @mrq: MMC request which completed
497 * CQE drivers should call this function when they have completed
498 * their processing of a request.
500 void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
502 mmc_should_fail_request(host, mrq);
504 /* Flag re-tuning needed on CRC errors */
505 if ((mrq->cmd && mrq->cmd->error == -EILSEQ) ||
506 (mrq->data && mrq->data->error == -EILSEQ))
507 mmc_retune_needed(host);
509 trace_mmc_request_done(host, mrq);
512 pr_debug("%s: CQE req done (direct CMD%u): %d\n",
513 mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error);
515 pr_debug("%s: CQE transfer done tag %d\n",
516 mmc_hostname(host), mrq->tag);
520 pr_debug("%s: %d bytes transferred: %d\n",
522 mrq->data->bytes_xfered, mrq->data->error);
527 EXPORT_SYMBOL(mmc_cqe_request_done);
530 * mmc_cqe_post_req - CQE post process of a completed MMC request
532 * @mrq: MMC request to be processed
534 void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq)
536 if (host->cqe_ops->cqe_post_req)
537 host->cqe_ops->cqe_post_req(host, mrq);
539 EXPORT_SYMBOL(mmc_cqe_post_req);
541 /* Arbitrary 1 second timeout */
542 #define MMC_CQE_RECOVERY_TIMEOUT 1000
545 * mmc_cqe_recovery - Recover from CQE errors.
546 * @host: MMC host to recover
548 * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in
549 * in eMMC, and discarding the queue in CQE. CQE must call
550 * mmc_cqe_request_done() on all requests. An error is returned if the eMMC
551 * fails to discard its queue.
553 int mmc_cqe_recovery(struct mmc_host *host)
555 struct mmc_command cmd;
558 mmc_retune_hold_now(host);
561 * Recovery is expected seldom, if at all, but it reduces performance,
562 * so make sure it is not completely silent.
564 pr_warn("%s: running CQE recovery\n", mmc_hostname(host));
566 host->cqe_ops->cqe_recovery_start(host);
568 memset(&cmd, 0, sizeof(cmd));
569 cmd.opcode = MMC_STOP_TRANSMISSION,
570 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC,
571 cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
572 cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
573 mmc_wait_for_cmd(host, &cmd, 0);
575 memset(&cmd, 0, sizeof(cmd));
576 cmd.opcode = MMC_CMDQ_TASK_MGMT;
577 cmd.arg = 1; /* Discard entire queue */
578 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
579 cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
580 cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
581 err = mmc_wait_for_cmd(host, &cmd, 0);
583 host->cqe_ops->cqe_recovery_finish(host);
585 mmc_retune_release(host);
589 EXPORT_SYMBOL(mmc_cqe_recovery);
592 * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
596 * mmc_is_req_done() is used with requests that have
597 * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
598 * starting a request and before waiting for it to complete. That is,
599 * either in between calls to mmc_start_req(), or after mmc_wait_for_req()
600 * and before mmc_wait_for_req_done(). If it is called at other times the
601 * result is not meaningful.
603 bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
605 return completion_done(&mrq->completion);
607 EXPORT_SYMBOL(mmc_is_req_done);
610 * mmc_wait_for_req - start a request and wait for completion
611 * @host: MMC host to start command
612 * @mrq: MMC request to start
614 * Start a new MMC custom command request for a host, and wait
615 * for the command to complete. In the case of 'cap_cmd_during_tfr'
616 * requests, the transfer is ongoing and the caller can issue further
617 * commands that do not use the data lines, and then wait by calling
618 * mmc_wait_for_req_done().
619 * Does not attempt to parse the response.
621 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
623 __mmc_start_req(host, mrq);
625 if (!mrq->cap_cmd_during_tfr)
626 mmc_wait_for_req_done(host, mrq);
628 EXPORT_SYMBOL(mmc_wait_for_req);
631 * mmc_wait_for_cmd - start a command and wait for completion
632 * @host: MMC host to start command
633 * @cmd: MMC command to start
634 * @retries: maximum number of retries
636 * Start a new MMC command for a host, and wait for the command
637 * to complete. Return any error that occurred while the command
638 * was executing. Do not attempt to parse the response.
640 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
642 struct mmc_request mrq = {};
644 WARN_ON(!host->claimed);
646 memset(cmd->resp, 0, sizeof(cmd->resp));
647 cmd->retries = retries;
652 mmc_wait_for_req(host, &mrq);
657 EXPORT_SYMBOL(mmc_wait_for_cmd);
660 * mmc_set_data_timeout - set the timeout for a data command
661 * @data: data phase for command
662 * @card: the MMC card associated with the data transfer
664 * Computes the data timeout parameters according to the
665 * correct algorithm given the card type.
667 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
672 * SDIO cards only define an upper 1 s limit on access.
674 if (mmc_card_sdio(card)) {
675 data->timeout_ns = 1000000000;
676 data->timeout_clks = 0;
681 * SD cards use a 100 multiplier rather than 10
683 mult = mmc_card_sd(card) ? 100 : 10;
686 * Scale up the multiplier (and therefore the timeout) by
687 * the r2w factor for writes.
689 if (data->flags & MMC_DATA_WRITE)
690 mult <<= card->csd.r2w_factor;
692 data->timeout_ns = card->csd.taac_ns * mult;
693 data->timeout_clks = card->csd.taac_clks * mult;
696 * SD cards also have an upper limit on the timeout.
698 if (mmc_card_sd(card)) {
699 unsigned int timeout_us, limit_us;
701 timeout_us = data->timeout_ns / 1000;
702 if (card->host->ios.clock)
703 timeout_us += data->timeout_clks * 1000 /
704 (card->host->ios.clock / 1000);
706 if (data->flags & MMC_DATA_WRITE)
708 * The MMC spec "It is strongly recommended
709 * for hosts to implement more than 500ms
710 * timeout value even if the card indicates
711 * the 250ms maximum busy length." Even the
712 * previous value of 300ms is known to be
713 * insufficient for some cards.
720 * SDHC cards always use these fixed values.
722 if (timeout_us > limit_us) {
723 data->timeout_ns = limit_us * 1000;
724 data->timeout_clks = 0;
727 /* assign limit value if invalid */
729 data->timeout_ns = limit_us * 1000;
733 * Some cards require longer data read timeout than indicated in CSD.
734 * Address this by setting the read timeout to a "reasonably high"
735 * value. For the cards tested, 600ms has proven enough. If necessary,
736 * this value can be increased if other problematic cards require this.
738 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
739 data->timeout_ns = 600000000;
740 data->timeout_clks = 0;
744 * Some cards need very high timeouts if driven in SPI mode.
745 * The worst observed timeout was 900ms after writing a
746 * continuous stream of data until the internal logic
749 if (mmc_host_is_spi(card->host)) {
750 if (data->flags & MMC_DATA_WRITE) {
751 if (data->timeout_ns < 1000000000)
752 data->timeout_ns = 1000000000; /* 1s */
754 if (data->timeout_ns < 100000000)
755 data->timeout_ns = 100000000; /* 100ms */
759 EXPORT_SYMBOL(mmc_set_data_timeout);
762 * mmc_align_data_size - pads a transfer size to a more optimal value
763 * @card: the MMC card associated with the data transfer
764 * @sz: original transfer size
766 * Pads the original data size with a number of extra bytes in
767 * order to avoid controller bugs and/or performance hits
768 * (e.g. some controllers revert to PIO for certain sizes).
770 * Returns the improved size, which might be unmodified.
772 * Note that this function is only relevant when issuing a
773 * single scatter gather entry.
775 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
778 * FIXME: We don't have a system for the controller to tell
779 * the core about its problems yet, so for now we just 32-bit
782 sz = ((sz + 3) / 4) * 4;
786 EXPORT_SYMBOL(mmc_align_data_size);
789 * Allow claiming an already claimed host if the context is the same or there is
790 * no context but the task is the same.
792 static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
793 struct task_struct *task)
795 return host->claimer == ctx ||
796 (!ctx && task && host->claimer->task == task);
799 static inline void mmc_ctx_set_claimer(struct mmc_host *host,
801 struct task_struct *task)
803 if (!host->claimer) {
807 host->claimer = &host->default_ctx;
810 host->claimer->task = task;
814 * __mmc_claim_host - exclusively claim a host
815 * @host: mmc host to claim
816 * @ctx: context that claims the host or NULL in which case the default
817 * context will be used
818 * @abort: whether or not the operation should be aborted
820 * Claim a host for a set of operations. If @abort is non null and
821 * dereference a non-zero value then this will return prematurely with
822 * that non-zero value without acquiring the lock. Returns zero
823 * with the lock held otherwise.
825 int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
828 struct task_struct *task = ctx ? NULL : current;
829 DECLARE_WAITQUEUE(wait, current);
836 add_wait_queue(&host->wq, &wait);
837 spin_lock_irqsave(&host->lock, flags);
839 set_current_state(TASK_UNINTERRUPTIBLE);
840 stop = abort ? atomic_read(abort) : 0;
841 if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
843 spin_unlock_irqrestore(&host->lock, flags);
845 spin_lock_irqsave(&host->lock, flags);
847 set_current_state(TASK_RUNNING);
850 mmc_ctx_set_claimer(host, ctx, task);
851 host->claim_cnt += 1;
852 if (host->claim_cnt == 1)
856 spin_unlock_irqrestore(&host->lock, flags);
857 remove_wait_queue(&host->wq, &wait);
860 pm_runtime_get_sync(mmc_dev(host));
864 EXPORT_SYMBOL(__mmc_claim_host);
867 * mmc_release_host - release a host
868 * @host: mmc host to release
870 * Release a MMC host, allowing others to claim the host
871 * for their operations.
873 void mmc_release_host(struct mmc_host *host)
877 WARN_ON(!host->claimed);
879 spin_lock_irqsave(&host->lock, flags);
880 if (--host->claim_cnt) {
881 /* Release for nested claim */
882 spin_unlock_irqrestore(&host->lock, flags);
885 host->claimer->task = NULL;
886 host->claimer = NULL;
887 spin_unlock_irqrestore(&host->lock, flags);
889 pm_runtime_mark_last_busy(mmc_dev(host));
890 if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
891 pm_runtime_put_sync_suspend(mmc_dev(host));
893 pm_runtime_put_autosuspend(mmc_dev(host));
896 EXPORT_SYMBOL(mmc_release_host);
899 * This is a helper function, which fetches a runtime pm reference for the
900 * card device and also claims the host.
902 void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
904 pm_runtime_get_sync(&card->dev);
905 __mmc_claim_host(card->host, ctx, NULL);
907 EXPORT_SYMBOL(mmc_get_card);
910 * This is a helper function, which releases the host and drops the runtime
911 * pm reference for the card device.
913 void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
915 struct mmc_host *host = card->host;
917 WARN_ON(ctx && host->claimer != ctx);
919 mmc_release_host(host);
920 pm_runtime_mark_last_busy(&card->dev);
921 pm_runtime_put_autosuspend(&card->dev);
923 EXPORT_SYMBOL(mmc_put_card);
926 * Internal function that does the actual ios call to the host driver,
927 * optionally printing some debug output.
929 static inline void mmc_set_ios(struct mmc_host *host)
931 struct mmc_ios *ios = &host->ios;
933 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
934 "width %u timing %u\n",
935 mmc_hostname(host), ios->clock, ios->bus_mode,
936 ios->power_mode, ios->chip_select, ios->vdd,
937 1 << ios->bus_width, ios->timing);
939 host->ops->set_ios(host, ios);
943 * Control chip select pin on a host.
945 void mmc_set_chip_select(struct mmc_host *host, int mode)
947 host->ios.chip_select = mode;
952 * Sets the host clock to the highest possible frequency that
955 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
957 WARN_ON(hz && hz < host->f_min);
959 if (hz > host->f_max)
962 host->ios.clock = hz;
966 int mmc_execute_tuning(struct mmc_card *card)
968 struct mmc_host *host = card->host;
972 if (!host->ops->execute_tuning)
976 host->cqe_ops->cqe_off(host);
978 if (mmc_card_mmc(card))
979 opcode = MMC_SEND_TUNING_BLOCK_HS200;
981 opcode = MMC_SEND_TUNING_BLOCK;
983 err = host->ops->execute_tuning(host, opcode);
986 pr_err("%s: tuning execution failed: %d\n",
987 mmc_hostname(host), err);
989 mmc_retune_enable(host);
995 * Change the bus mode (open drain/push-pull) of a host.
997 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
999 host->ios.bus_mode = mode;
1004 * Change data bus width of a host.
1006 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1008 host->ios.bus_width = width;
1013 * Set initial state after a power cycle or a hw_reset.
1015 void mmc_set_initial_state(struct mmc_host *host)
1018 host->cqe_ops->cqe_off(host);
1020 mmc_retune_disable(host);
1022 if (mmc_host_is_spi(host))
1023 host->ios.chip_select = MMC_CS_HIGH;
1025 host->ios.chip_select = MMC_CS_DONTCARE;
1026 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1027 host->ios.bus_width = MMC_BUS_WIDTH_1;
1028 host->ios.timing = MMC_TIMING_LEGACY;
1029 host->ios.drv_type = 0;
1030 host->ios.enhanced_strobe = false;
1033 * Make sure we are in non-enhanced strobe mode before we
1034 * actually enable it in ext_csd.
1036 if ((host->caps2 & MMC_CAP2_HS400_ES) &&
1037 host->ops->hs400_enhanced_strobe)
1038 host->ops->hs400_enhanced_strobe(host, &host->ios);
1044 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1045 * @vdd: voltage (mV)
1046 * @low_bits: prefer low bits in boundary cases
1048 * This function returns the OCR bit number according to the provided @vdd
1049 * value. If conversion is not possible a negative errno value returned.
1051 * Depending on the @low_bits flag the function prefers low or high OCR bits
1052 * on boundary voltages. For example,
1053 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1054 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1056 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1058 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1060 const int max_bit = ilog2(MMC_VDD_35_36);
1063 if (vdd < 1650 || vdd > 3600)
1066 if (vdd >= 1650 && vdd <= 1950)
1067 return ilog2(MMC_VDD_165_195);
1072 /* Base 2000 mV, step 100 mV, bit's base 8. */
1073 bit = (vdd - 2000) / 100 + 8;
1080 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1081 * @vdd_min: minimum voltage value (mV)
1082 * @vdd_max: maximum voltage value (mV)
1084 * This function returns the OCR mask bits according to the provided @vdd_min
1085 * and @vdd_max values. If conversion is not possible the function returns 0.
1087 * Notes wrt boundary cases:
1088 * This function sets the OCR bits for all boundary voltages, for example
1089 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1090 * MMC_VDD_34_35 mask.
1092 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1096 if (vdd_max < vdd_min)
1099 /* Prefer high bits for the boundary vdd_max values. */
1100 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1104 /* Prefer low bits for the boundary vdd_min values. */
1105 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1109 /* Fill the mask, from max bit to min bit. */
1110 while (vdd_max >= vdd_min)
1111 mask |= 1 << vdd_max--;
1115 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1120 * mmc_of_parse_voltage - return mask of supported voltages
1121 * @np: The device node need to be parsed.
1122 * @mask: mask of voltages available for MMC/SD/SDIO
1124 * Parse the "voltage-ranges" DT property, returning zero if it is not
1125 * found, negative errno if the voltage-range specification is invalid,
1126 * or one if the voltage-range is specified and successfully parsed.
1128 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1130 const u32 *voltage_ranges;
1133 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1134 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1135 if (!voltage_ranges) {
1136 pr_debug("%pOF: voltage-ranges unspecified\n", np);
1140 pr_err("%pOF: voltage-ranges empty\n", np);
1144 for (i = 0; i < num_ranges; i++) {
1145 const int j = i * 2;
1148 ocr_mask = mmc_vddrange_to_ocrmask(
1149 be32_to_cpu(voltage_ranges[j]),
1150 be32_to_cpu(voltage_ranges[j + 1]));
1152 pr_err("%pOF: voltage-range #%d is invalid\n",
1161 EXPORT_SYMBOL(mmc_of_parse_voltage);
1163 #endif /* CONFIG_OF */
1165 static int mmc_of_get_func_num(struct device_node *node)
1170 ret = of_property_read_u32(node, "reg", ®);
1177 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1180 struct device_node *node;
1182 if (!host->parent || !host->parent->of_node)
1185 for_each_child_of_node(host->parent->of_node, node) {
1186 if (mmc_of_get_func_num(node) == func_num)
1193 #ifdef CONFIG_REGULATOR
1196 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1197 * @vdd_bit: OCR bit number
1198 * @min_uV: minimum voltage value (mV)
1199 * @max_uV: maximum voltage value (mV)
1201 * This function returns the voltage range according to the provided OCR
1202 * bit number. If conversion is not possible a negative errno value returned.
1204 static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1212 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1213 * bits this regulator doesn't quite support ... don't
1214 * be too picky, most cards and regulators are OK with
1215 * a 0.1V range goof (it's a small error percentage).
1217 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1219 *min_uV = 1650 * 1000;
1220 *max_uV = 1950 * 1000;
1222 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1223 *max_uV = *min_uV + 100 * 1000;
1230 * mmc_regulator_get_ocrmask - return mask of supported voltages
1231 * @supply: regulator to use
1233 * This returns either a negative errno, or a mask of voltages that
1234 * can be provided to MMC/SD/SDIO devices using the specified voltage
1235 * regulator. This would normally be called before registering the
1238 int mmc_regulator_get_ocrmask(struct regulator *supply)
1246 count = regulator_count_voltages(supply);
1250 for (i = 0; i < count; i++) {
1251 vdd_uV = regulator_list_voltage(supply, i);
1255 vdd_mV = vdd_uV / 1000;
1256 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1260 vdd_uV = regulator_get_voltage(supply);
1264 vdd_mV = vdd_uV / 1000;
1265 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1270 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1273 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1274 * @mmc: the host to regulate
1275 * @supply: regulator to use
1276 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1278 * Returns zero on success, else negative errno.
1280 * MMC host drivers may use this to enable or disable a regulator using
1281 * a particular supply voltage. This would normally be called from the
1284 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1285 struct regulator *supply,
1286 unsigned short vdd_bit)
1292 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1294 result = regulator_set_voltage(supply, min_uV, max_uV);
1295 if (result == 0 && !mmc->regulator_enabled) {
1296 result = regulator_enable(supply);
1298 mmc->regulator_enabled = true;
1300 } else if (mmc->regulator_enabled) {
1301 result = regulator_disable(supply);
1303 mmc->regulator_enabled = false;
1307 dev_err(mmc_dev(mmc),
1308 "could not set regulator OCR (%d)\n", result);
1311 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1313 static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1314 int min_uV, int target_uV,
1318 * Check if supported first to avoid errors since we may try several
1319 * signal levels during power up and don't want to show errors.
1321 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1324 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1329 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1331 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1332 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1333 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1334 * SD card spec also define VQMMC in terms of VMMC.
1335 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1337 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1338 * requested voltage. This is definitely a good idea for UHS where there's a
1339 * separate regulator on the card that's trying to make 1.8V and it's best if
1342 * This function is expected to be used by a controller's
1343 * start_signal_voltage_switch() function.
1345 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1347 struct device *dev = mmc_dev(mmc);
1348 int ret, volt, min_uV, max_uV;
1350 /* If no vqmmc supply then we can't change the voltage */
1351 if (IS_ERR(mmc->supply.vqmmc))
1354 switch (ios->signal_voltage) {
1355 case MMC_SIGNAL_VOLTAGE_120:
1356 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1357 1100000, 1200000, 1300000);
1358 case MMC_SIGNAL_VOLTAGE_180:
1359 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1360 1700000, 1800000, 1950000);
1361 case MMC_SIGNAL_VOLTAGE_330:
1362 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1366 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1367 __func__, volt, max_uV);
1369 min_uV = max(volt - 300000, 2700000);
1370 max_uV = min(max_uV + 200000, 3600000);
1373 * Due to a limitation in the current implementation of
1374 * regulator_set_voltage_triplet() which is taking the lowest
1375 * voltage possible if below the target, search for a suitable
1376 * voltage in two steps and try to stay close to vmmc
1377 * with a 0.3V tolerance at first.
1379 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1380 min_uV, volt, max_uV))
1383 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1384 2700000, volt, 3600000);
1389 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1391 #endif /* CONFIG_REGULATOR */
1394 * mmc_regulator_get_supply - try to get VMMC and VQMMC regulators for a host
1395 * @mmc: the host to regulate
1397 * Returns 0 or errno. errno should be handled, it is either a critical error
1398 * or -EPROBE_DEFER. 0 means no critical error but it does not mean all
1399 * regulators have been found because they all are optional. If you require
1400 * certain regulators, you need to check separately in your driver if they got
1401 * populated after calling this function.
1403 int mmc_regulator_get_supply(struct mmc_host *mmc)
1405 struct device *dev = mmc_dev(mmc);
1408 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1409 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1411 if (IS_ERR(mmc->supply.vmmc)) {
1412 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1413 return -EPROBE_DEFER;
1414 dev_dbg(dev, "No vmmc regulator found\n");
1416 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1418 mmc->ocr_avail = ret;
1420 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1423 if (IS_ERR(mmc->supply.vqmmc)) {
1424 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1425 return -EPROBE_DEFER;
1426 dev_dbg(dev, "No vqmmc regulator found\n");
1431 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1434 * Mask off any voltages we don't support and select
1435 * the lowest voltage
1437 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1442 * Sanity check the voltages that the card claims to
1446 dev_warn(mmc_dev(host),
1447 "card claims to support voltages below defined range\n");
1451 ocr &= host->ocr_avail;
1453 dev_warn(mmc_dev(host), "no support for card's volts\n");
1457 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1460 mmc_power_cycle(host, ocr);
1464 if (bit != host->ios.vdd)
1465 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1471 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1474 int old_signal_voltage = host->ios.signal_voltage;
1476 host->ios.signal_voltage = signal_voltage;
1477 if (host->ops->start_signal_voltage_switch)
1478 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1481 host->ios.signal_voltage = old_signal_voltage;
1487 void mmc_set_initial_signal_voltage(struct mmc_host *host)
1489 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1490 if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330))
1491 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1492 else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1493 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1494 else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120))
1495 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1498 int mmc_host_set_uhs_voltage(struct mmc_host *host)
1503 * During a signal voltage level switch, the clock must be gated
1504 * for 5 ms according to the SD spec
1506 clock = host->ios.clock;
1507 host->ios.clock = 0;
1510 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1513 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1515 host->ios.clock = clock;
1521 int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
1523 struct mmc_command cmd = {};
1527 * If we cannot switch voltages, return failure so the caller
1528 * can continue without UHS mode
1530 if (!host->ops->start_signal_voltage_switch)
1532 if (!host->ops->card_busy)
1533 pr_warn("%s: cannot verify signal voltage switch\n",
1534 mmc_hostname(host));
1536 cmd.opcode = SD_SWITCH_VOLTAGE;
1538 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1540 err = mmc_wait_for_cmd(host, &cmd, 0);
1544 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1548 * The card should drive cmd and dat[0:3] low immediately
1549 * after the response of cmd11, but wait 1 ms to be sure
1552 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1557 if (mmc_host_set_uhs_voltage(host)) {
1559 * Voltages may not have been switched, but we've already
1560 * sent CMD11, so a power cycle is required anyway
1566 /* Wait for at least 1 ms according to spec */
1570 * Failure to switch is indicated by the card holding
1573 if (host->ops->card_busy && host->ops->card_busy(host))
1578 pr_debug("%s: Signal voltage switch failed, "
1579 "power cycling card\n", mmc_hostname(host));
1580 mmc_power_cycle(host, ocr);
1587 * Select timing parameters for host.
1589 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1591 host->ios.timing = timing;
1596 * Select appropriate driver type for host.
1598 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1600 host->ios.drv_type = drv_type;
1604 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1605 int card_drv_type, int *drv_type)
1607 struct mmc_host *host = card->host;
1608 int host_drv_type = SD_DRIVER_TYPE_B;
1612 if (!host->ops->select_drive_strength)
1615 /* Use SD definition of driver strength for hosts */
1616 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1617 host_drv_type |= SD_DRIVER_TYPE_A;
1619 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1620 host_drv_type |= SD_DRIVER_TYPE_C;
1622 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1623 host_drv_type |= SD_DRIVER_TYPE_D;
1626 * The drive strength that the hardware can support
1627 * depends on the board design. Pass the appropriate
1628 * information and let the hardware specific code
1629 * return what is possible given the options
1631 return host->ops->select_drive_strength(card, max_dtr,
1638 * Apply power to the MMC stack. This is a two-stage process.
1639 * First, we enable power to the card without the clock running.
1640 * We then wait a bit for the power to stabilise. Finally,
1641 * enable the bus drivers and clock to the card.
1643 * We must _NOT_ enable the clock prior to power stablising.
1645 * If a host does all the power sequencing itself, ignore the
1646 * initial MMC_POWER_UP stage.
1648 void mmc_power_up(struct mmc_host *host, u32 ocr)
1650 if (host->ios.power_mode == MMC_POWER_ON)
1653 mmc_pwrseq_pre_power_on(host);
1655 host->ios.vdd = fls(ocr) - 1;
1656 host->ios.power_mode = MMC_POWER_UP;
1657 /* Set initial state and call mmc_set_ios */
1658 mmc_set_initial_state(host);
1660 mmc_set_initial_signal_voltage(host);
1663 * This delay should be sufficient to allow the power supply
1664 * to reach the minimum voltage.
1666 mmc_delay(host->ios.power_delay_ms);
1668 mmc_pwrseq_post_power_on(host);
1670 host->ios.clock = host->f_init;
1672 host->ios.power_mode = MMC_POWER_ON;
1676 * This delay must be at least 74 clock sizes, or 1 ms, or the
1677 * time required to reach a stable voltage.
1679 mmc_delay(host->ios.power_delay_ms);
1682 void mmc_power_off(struct mmc_host *host)
1684 if (host->ios.power_mode == MMC_POWER_OFF)
1687 mmc_pwrseq_power_off(host);
1689 host->ios.clock = 0;
1692 host->ios.power_mode = MMC_POWER_OFF;
1693 /* Set initial state and call mmc_set_ios */
1694 mmc_set_initial_state(host);
1697 * Some configurations, such as the 802.11 SDIO card in the OLPC
1698 * XO-1.5, require a short delay after poweroff before the card
1699 * can be successfully turned on again.
1704 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1706 mmc_power_off(host);
1707 /* Wait at least 1 ms according to SD spec */
1709 mmc_power_up(host, ocr);
1713 * Cleanup when the last reference to the bus operator is dropped.
1715 static void __mmc_release_bus(struct mmc_host *host)
1717 WARN_ON(!host->bus_dead);
1719 host->bus_ops = NULL;
1723 * Increase reference count of bus operator
1725 static inline void mmc_bus_get(struct mmc_host *host)
1727 unsigned long flags;
1729 spin_lock_irqsave(&host->lock, flags);
1731 spin_unlock_irqrestore(&host->lock, flags);
1735 * Decrease reference count of bus operator and free it if
1736 * it is the last reference.
1738 static inline void mmc_bus_put(struct mmc_host *host)
1740 unsigned long flags;
1742 spin_lock_irqsave(&host->lock, flags);
1744 if ((host->bus_refs == 0) && host->bus_ops)
1745 __mmc_release_bus(host);
1746 spin_unlock_irqrestore(&host->lock, flags);
1750 * Assign a mmc bus handler to a host. Only one bus handler may control a
1751 * host at any given time.
1753 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1755 unsigned long flags;
1757 WARN_ON(!host->claimed);
1759 spin_lock_irqsave(&host->lock, flags);
1761 WARN_ON(host->bus_ops);
1762 WARN_ON(host->bus_refs);
1764 host->bus_ops = ops;
1768 spin_unlock_irqrestore(&host->lock, flags);
1772 * Remove the current bus handler from a host.
1774 void mmc_detach_bus(struct mmc_host *host)
1776 unsigned long flags;
1778 WARN_ON(!host->claimed);
1779 WARN_ON(!host->bus_ops);
1781 spin_lock_irqsave(&host->lock, flags);
1785 spin_unlock_irqrestore(&host->lock, flags);
1790 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1794 * If the device is configured as wakeup, we prevent a new sleep for
1795 * 5 s to give provision for user space to consume the event.
1797 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1798 device_can_wakeup(mmc_dev(host)))
1799 pm_wakeup_event(mmc_dev(host), 5000);
1801 host->detect_change = 1;
1802 mmc_schedule_delayed_work(&host->detect, delay);
1806 * mmc_detect_change - process change of state on a MMC socket
1807 * @host: host which changed state.
1808 * @delay: optional delay to wait before detection (jiffies)
1810 * MMC drivers should call this when they detect a card has been
1811 * inserted or removed. The MMC layer will confirm that any
1812 * present card is still functional, and initialize any newly
1815 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1817 _mmc_detect_change(host, delay, true);
1819 EXPORT_SYMBOL(mmc_detect_change);
1821 void mmc_init_erase(struct mmc_card *card)
1825 if (is_power_of_2(card->erase_size))
1826 card->erase_shift = ffs(card->erase_size) - 1;
1828 card->erase_shift = 0;
1831 * It is possible to erase an arbitrarily large area of an SD or MMC
1832 * card. That is not desirable because it can take a long time
1833 * (minutes) potentially delaying more important I/O, and also the
1834 * timeout calculations become increasingly hugely over-estimated.
1835 * Consequently, 'pref_erase' is defined as a guide to limit erases
1836 * to that size and alignment.
1838 * For SD cards that define Allocation Unit size, limit erases to one
1839 * Allocation Unit at a time.
1840 * For MMC, have a stab at ai good value and for modern cards it will
1841 * end up being 4MiB. Note that if the value is too small, it can end
1842 * up taking longer to erase. Also note, erase_size is already set to
1843 * High Capacity Erase Size if available when this function is called.
1845 if (mmc_card_sd(card) && card->ssr.au) {
1846 card->pref_erase = card->ssr.au;
1847 card->erase_shift = ffs(card->ssr.au) - 1;
1848 } else if (card->erase_size) {
1849 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1851 card->pref_erase = 512 * 1024 / 512;
1853 card->pref_erase = 1024 * 1024 / 512;
1855 card->pref_erase = 2 * 1024 * 1024 / 512;
1857 card->pref_erase = 4 * 1024 * 1024 / 512;
1858 if (card->pref_erase < card->erase_size)
1859 card->pref_erase = card->erase_size;
1861 sz = card->pref_erase % card->erase_size;
1863 card->pref_erase += card->erase_size - sz;
1866 card->pref_erase = 0;
1869 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1870 unsigned int arg, unsigned int qty)
1872 unsigned int erase_timeout;
1874 if (arg == MMC_DISCARD_ARG ||
1875 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1876 erase_timeout = card->ext_csd.trim_timeout;
1877 } else if (card->ext_csd.erase_group_def & 1) {
1878 /* High Capacity Erase Group Size uses HC timeouts */
1879 if (arg == MMC_TRIM_ARG)
1880 erase_timeout = card->ext_csd.trim_timeout;
1882 erase_timeout = card->ext_csd.hc_erase_timeout;
1884 /* CSD Erase Group Size uses write timeout */
1885 unsigned int mult = (10 << card->csd.r2w_factor);
1886 unsigned int timeout_clks = card->csd.taac_clks * mult;
1887 unsigned int timeout_us;
1889 /* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */
1890 if (card->csd.taac_ns < 1000000)
1891 timeout_us = (card->csd.taac_ns * mult) / 1000;
1893 timeout_us = (card->csd.taac_ns / 1000) * mult;
1896 * ios.clock is only a target. The real clock rate might be
1897 * less but not that much less, so fudge it by multiplying by 2.
1900 timeout_us += (timeout_clks * 1000) /
1901 (card->host->ios.clock / 1000);
1903 erase_timeout = timeout_us / 1000;
1906 * Theoretically, the calculation could underflow so round up
1907 * to 1ms in that case.
1913 /* Multiplier for secure operations */
1914 if (arg & MMC_SECURE_ARGS) {
1915 if (arg == MMC_SECURE_ERASE_ARG)
1916 erase_timeout *= card->ext_csd.sec_erase_mult;
1918 erase_timeout *= card->ext_csd.sec_trim_mult;
1921 erase_timeout *= qty;
1924 * Ensure at least a 1 second timeout for SPI as per
1925 * 'mmc_set_data_timeout()'
1927 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1928 erase_timeout = 1000;
1930 return erase_timeout;
1933 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1937 unsigned int erase_timeout;
1939 if (card->ssr.erase_timeout) {
1940 /* Erase timeout specified in SD Status Register (SSR) */
1941 erase_timeout = card->ssr.erase_timeout * qty +
1942 card->ssr.erase_offset;
1945 * Erase timeout not specified in SD Status Register (SSR) so
1946 * use 250ms per write block.
1948 erase_timeout = 250 * qty;
1951 /* Must not be less than 1 second */
1952 if (erase_timeout < 1000)
1953 erase_timeout = 1000;
1955 return erase_timeout;
1958 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1962 if (mmc_card_sd(card))
1963 return mmc_sd_erase_timeout(card, arg, qty);
1965 return mmc_mmc_erase_timeout(card, arg, qty);
1968 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1969 unsigned int to, unsigned int arg)
1971 struct mmc_command cmd = {};
1972 unsigned int qty = 0, busy_timeout = 0;
1973 bool use_r1b_resp = false;
1974 unsigned long timeout;
1975 int loop_udelay=64, udelay_max=32768;
1978 mmc_retune_hold(card->host);
1981 * qty is used to calculate the erase timeout which depends on how many
1982 * erase groups (or allocation units in SD terminology) are affected.
1983 * We count erasing part of an erase group as one erase group.
1984 * For SD, the allocation units are always a power of 2. For MMC, the
1985 * erase group size is almost certainly also power of 2, but it does not
1986 * seem to insist on that in the JEDEC standard, so we fall back to
1987 * division in that case. SD may not specify an allocation unit size,
1988 * in which case the timeout is based on the number of write blocks.
1990 * Note that the timeout for secure trim 2 will only be correct if the
1991 * number of erase groups specified is the same as the total of all
1992 * preceding secure trim 1 commands. Since the power may have been
1993 * lost since the secure trim 1 commands occurred, it is generally
1994 * impossible to calculate the secure trim 2 timeout correctly.
1996 if (card->erase_shift)
1997 qty += ((to >> card->erase_shift) -
1998 (from >> card->erase_shift)) + 1;
1999 else if (mmc_card_sd(card))
2000 qty += to - from + 1;
2002 qty += ((to / card->erase_size) -
2003 (from / card->erase_size)) + 1;
2005 if (!mmc_card_blockaddr(card)) {
2010 if (mmc_card_sd(card))
2011 cmd.opcode = SD_ERASE_WR_BLK_START;
2013 cmd.opcode = MMC_ERASE_GROUP_START;
2015 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2016 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2018 pr_err("mmc_erase: group start error %d, "
2019 "status %#x\n", err, cmd.resp[0]);
2024 memset(&cmd, 0, sizeof(struct mmc_command));
2025 if (mmc_card_sd(card))
2026 cmd.opcode = SD_ERASE_WR_BLK_END;
2028 cmd.opcode = MMC_ERASE_GROUP_END;
2030 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2031 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2033 pr_err("mmc_erase: group end error %d, status %#x\n",
2039 memset(&cmd, 0, sizeof(struct mmc_command));
2040 cmd.opcode = MMC_ERASE;
2042 busy_timeout = mmc_erase_timeout(card, arg, qty);
2044 * If the host controller supports busy signalling and the timeout for
2045 * the erase operation does not exceed the max_busy_timeout, we should
2046 * use R1B response. Or we need to prevent the host from doing hw busy
2047 * detection, which is done by converting to a R1 response instead.
2049 if (card->host->max_busy_timeout &&
2050 busy_timeout > card->host->max_busy_timeout) {
2051 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2053 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2054 cmd.busy_timeout = busy_timeout;
2055 use_r1b_resp = true;
2058 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2060 pr_err("mmc_erase: erase error %d, status %#x\n",
2066 if (mmc_host_is_spi(card->host))
2070 * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
2073 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
2076 timeout = jiffies + msecs_to_jiffies(busy_timeout);
2078 memset(&cmd, 0, sizeof(struct mmc_command));
2079 cmd.opcode = MMC_SEND_STATUS;
2080 cmd.arg = card->rca << 16;
2081 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2082 /* Do not retry else we can't see errors */
2083 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2084 if (err || R1_STATUS(cmd.resp[0])) {
2085 pr_err("error %d requesting status %#x\n",
2091 /* Timeout if the device never becomes ready for data and
2092 * never leaves the program state.
2094 if (time_after(jiffies, timeout)) {
2095 pr_err("%s: Card stuck in programming state! %s\n",
2096 mmc_hostname(card->host), __func__);
2100 if ((cmd.resp[0] & R1_READY_FOR_DATA) &&
2101 R1_CURRENT_STATE(cmd.resp[0]) != R1_STATE_PRG)
2104 usleep_range(loop_udelay, loop_udelay*2);
2105 if (loop_udelay < udelay_max)
2110 mmc_retune_release(card->host);
2114 static unsigned int mmc_align_erase_size(struct mmc_card *card,
2119 unsigned int from_new = *from, nr_new = nr, rem;
2122 * When the 'card->erase_size' is power of 2, we can use round_up/down()
2123 * to align the erase size efficiently.
2125 if (is_power_of_2(card->erase_size)) {
2126 unsigned int temp = from_new;
2128 from_new = round_up(temp, card->erase_size);
2129 rem = from_new - temp;
2136 nr_new = round_down(nr_new, card->erase_size);
2138 rem = from_new % card->erase_size;
2140 rem = card->erase_size - rem;
2148 rem = nr_new % card->erase_size;
2156 *to = from_new + nr_new;
2163 * mmc_erase - erase sectors.
2164 * @card: card to erase
2165 * @from: first sector to erase
2166 * @nr: number of sectors to erase
2167 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2169 * Caller must claim host before calling this function.
2171 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2174 unsigned int rem, to = from + nr;
2177 if (!(card->host->caps & MMC_CAP_ERASE) ||
2178 !(card->csd.cmdclass & CCC_ERASE))
2181 if (!card->erase_size)
2184 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2187 if ((arg & MMC_SECURE_ARGS) &&
2188 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2191 if ((arg & MMC_TRIM_ARGS) &&
2192 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2195 if (arg == MMC_SECURE_ERASE_ARG) {
2196 if (from % card->erase_size || nr % card->erase_size)
2200 if (arg == MMC_ERASE_ARG)
2201 nr = mmc_align_erase_size(card, &from, &to, nr);
2209 /* 'from' and 'to' are inclusive */
2213 * Special case where only one erase-group fits in the timeout budget:
2214 * If the region crosses an erase-group boundary on this particular
2215 * case, we will be trimming more than one erase-group which, does not
2216 * fit in the timeout budget of the controller, so we need to split it
2217 * and call mmc_do_erase() twice if necessary. This special case is
2218 * identified by the card->eg_boundary flag.
2220 rem = card->erase_size - (from % card->erase_size);
2221 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2222 err = mmc_do_erase(card, from, from + rem - 1, arg);
2224 if ((err) || (to <= from))
2228 return mmc_do_erase(card, from, to, arg);
2230 EXPORT_SYMBOL(mmc_erase);
2232 int mmc_can_erase(struct mmc_card *card)
2234 if ((card->host->caps & MMC_CAP_ERASE) &&
2235 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2239 EXPORT_SYMBOL(mmc_can_erase);
2241 int mmc_can_trim(struct mmc_card *card)
2243 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2244 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2248 EXPORT_SYMBOL(mmc_can_trim);
2250 int mmc_can_discard(struct mmc_card *card)
2253 * As there's no way to detect the discard support bit at v4.5
2254 * use the s/w feature support filed.
2256 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2260 EXPORT_SYMBOL(mmc_can_discard);
2262 int mmc_can_sanitize(struct mmc_card *card)
2264 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2266 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2270 EXPORT_SYMBOL(mmc_can_sanitize);
2272 int mmc_can_secure_erase_trim(struct mmc_card *card)
2274 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2275 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2279 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2281 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2284 if (!card->erase_size)
2286 if (from % card->erase_size || nr % card->erase_size)
2290 EXPORT_SYMBOL(mmc_erase_group_aligned);
2292 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2295 struct mmc_host *host = card->host;
2296 unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
2297 unsigned int last_timeout = 0;
2298 unsigned int max_busy_timeout = host->max_busy_timeout ?
2299 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
2301 if (card->erase_shift) {
2302 max_qty = UINT_MAX >> card->erase_shift;
2303 min_qty = card->pref_erase >> card->erase_shift;
2304 } else if (mmc_card_sd(card)) {
2306 min_qty = card->pref_erase;
2308 max_qty = UINT_MAX / card->erase_size;
2309 min_qty = card->pref_erase / card->erase_size;
2313 * We should not only use 'host->max_busy_timeout' as the limitation
2314 * when deciding the max discard sectors. We should set a balance value
2315 * to improve the erase speed, and it can not get too long timeout at
2318 * Here we set 'card->pref_erase' as the minimal discard sectors no
2319 * matter what size of 'host->max_busy_timeout', but if the
2320 * 'host->max_busy_timeout' is large enough for more discard sectors,
2321 * then we can continue to increase the max discard sectors until we
2322 * get a balance value. In cases when the 'host->max_busy_timeout'
2323 * isn't specified, use the default max erase timeout.
2327 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2328 timeout = mmc_erase_timeout(card, arg, qty + x);
2330 if (qty + x > min_qty && timeout > max_busy_timeout)
2333 if (timeout < last_timeout)
2335 last_timeout = timeout;
2345 * When specifying a sector range to trim, chances are we might cross
2346 * an erase-group boundary even if the amount of sectors is less than
2348 * If we can only fit one erase-group in the controller timeout budget,
2349 * we have to care that erase-group boundaries are not crossed by a
2350 * single trim operation. We flag that special case with "eg_boundary".
2351 * In all other cases we can just decrement qty and pretend that we
2352 * always touch (qty + 1) erase-groups as a simple optimization.
2355 card->eg_boundary = 1;
2359 /* Convert qty to sectors */
2360 if (card->erase_shift)
2361 max_discard = qty << card->erase_shift;
2362 else if (mmc_card_sd(card))
2363 max_discard = qty + 1;
2365 max_discard = qty * card->erase_size;
2370 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2372 struct mmc_host *host = card->host;
2373 unsigned int max_discard, max_trim;
2376 * Without erase_group_def set, MMC erase timeout depends on clock
2377 * frequence which can change. In that case, the best choice is
2378 * just the preferred erase size.
2380 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2381 return card->pref_erase;
2383 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2384 if (max_discard && mmc_can_trim(card)) {
2385 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2386 if (max_trim < max_discard)
2387 max_discard = max_trim;
2388 } else if (max_discard < card->erase_size) {
2391 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2392 mmc_hostname(host), max_discard, host->max_busy_timeout ?
2393 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
2396 EXPORT_SYMBOL(mmc_calc_max_discard);
2398 bool mmc_card_is_blockaddr(struct mmc_card *card)
2400 return card ? mmc_card_blockaddr(card) : false;
2402 EXPORT_SYMBOL(mmc_card_is_blockaddr);
2404 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2406 struct mmc_command cmd = {};
2408 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
2409 mmc_card_hs400(card) || mmc_card_hs400es(card))
2412 cmd.opcode = MMC_SET_BLOCKLEN;
2414 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2415 return mmc_wait_for_cmd(card->host, &cmd, 5);
2417 EXPORT_SYMBOL(mmc_set_blocklen);
2419 static void mmc_hw_reset_for_init(struct mmc_host *host)
2421 mmc_pwrseq_reset(host);
2423 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2425 host->ops->hw_reset(host);
2428 int mmc_hw_reset(struct mmc_host *host)
2436 if (!host->bus_ops || host->bus_dead || !host->bus_ops->hw_reset) {
2441 ret = host->bus_ops->hw_reset(host);
2445 pr_warn("%s: tried to HW reset card, got error %d\n",
2446 mmc_hostname(host), ret);
2450 EXPORT_SYMBOL(mmc_hw_reset);
2452 int mmc_sw_reset(struct mmc_host *host)
2460 if (!host->bus_ops || host->bus_dead || !host->bus_ops->sw_reset) {
2465 ret = host->bus_ops->sw_reset(host);
2469 pr_warn("%s: tried to SW reset card, got error %d\n",
2470 mmc_hostname(host), ret);
2474 EXPORT_SYMBOL(mmc_sw_reset);
2476 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2478 host->f_init = freq;
2480 pr_debug("%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.
2495 * Skip it if we already know that we do not support SDIO commands
2497 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2502 if (!(host->caps2 & MMC_CAP2_NO_SD))
2503 mmc_send_if_cond(host, host->ocr_avail);
2505 /* Order's important: probe SDIO, then SD, then MMC */
2506 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2507 if (!mmc_attach_sdio(host))
2510 if (!(host->caps2 & MMC_CAP2_NO_SD))
2511 if (!mmc_attach_sd(host))
2514 if (!(host->caps2 & MMC_CAP2_NO_MMC))
2515 if (!mmc_attach_mmc(host))
2518 mmc_power_off(host);
2522 int _mmc_detect_card_removed(struct mmc_host *host)
2526 if (!host->card || mmc_card_removed(host->card))
2529 ret = host->bus_ops->alive(host);
2532 * Card detect status and alive check may be out of sync if card is
2533 * removed slowly, when card detect switch changes while card/slot
2534 * pads are still contacted in hardware (refer to "SD Card Mechanical
2535 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2536 * detect work 200ms later for this case.
2538 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2539 mmc_detect_change(host, msecs_to_jiffies(200));
2540 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2544 mmc_card_set_removed(host->card);
2545 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2551 int mmc_detect_card_removed(struct mmc_host *host)
2553 struct mmc_card *card = host->card;
2556 WARN_ON(!host->claimed);
2561 if (!mmc_card_is_removable(host))
2564 ret = mmc_card_removed(card);
2566 * The card will be considered unchanged unless we have been asked to
2567 * detect a change or host requires polling to provide card detection.
2569 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2572 host->detect_change = 0;
2574 ret = _mmc_detect_card_removed(host);
2575 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2577 * Schedule a detect work as soon as possible to let a
2578 * rescan handle the card removal.
2580 cancel_delayed_work(&host->detect);
2581 _mmc_detect_change(host, 0, false);
2587 EXPORT_SYMBOL(mmc_detect_card_removed);
2589 void mmc_rescan(struct work_struct *work)
2591 struct mmc_host *host =
2592 container_of(work, struct mmc_host, detect.work);
2595 if (host->rescan_disable)
2598 /* If there is a non-removable card registered, only scan once */
2599 if (!mmc_card_is_removable(host) && host->rescan_entered)
2601 host->rescan_entered = 1;
2603 if (host->trigger_card_event && host->ops->card_event) {
2604 mmc_claim_host(host);
2605 host->ops->card_event(host);
2606 mmc_release_host(host);
2607 host->trigger_card_event = false;
2613 * if there is a _removable_ card registered, check whether it is
2616 if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host))
2617 host->bus_ops->detect(host);
2619 host->detect_change = 0;
2622 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2623 * the card is no longer present.
2628 /* if there still is a card present, stop here */
2629 if (host->bus_ops != NULL) {
2635 * Only we can add a new handler, so it's safe to
2636 * release the lock here.
2640 mmc_claim_host(host);
2641 if (mmc_card_is_removable(host) && host->ops->get_cd &&
2642 host->ops->get_cd(host) == 0) {
2643 mmc_power_off(host);
2644 mmc_release_host(host);
2648 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2649 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2651 if (freqs[i] <= host->f_min)
2654 mmc_release_host(host);
2657 if (host->caps & MMC_CAP_NEEDS_POLL)
2658 mmc_schedule_delayed_work(&host->detect, HZ);
2661 void mmc_start_host(struct mmc_host *host)
2663 host->f_init = max(freqs[0], host->f_min);
2664 host->rescan_disable = 0;
2665 host->ios.power_mode = MMC_POWER_UNDEFINED;
2667 if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
2668 mmc_claim_host(host);
2669 mmc_power_up(host, host->ocr_avail);
2670 mmc_release_host(host);
2673 mmc_gpiod_request_cd_irq(host);
2674 _mmc_detect_change(host, 0, false);
2677 void mmc_stop_host(struct mmc_host *host)
2679 if (host->slot.cd_irq >= 0) {
2680 mmc_gpio_set_cd_wake(host, false);
2681 disable_irq(host->slot.cd_irq);
2684 host->rescan_disable = 1;
2685 cancel_delayed_work_sync(&host->detect);
2687 /* clear pm flags now and let card drivers set them as needed */
2691 if (host->bus_ops && !host->bus_dead) {
2692 /* Calling bus_ops->remove() with a claimed host can deadlock */
2693 host->bus_ops->remove(host);
2694 mmc_claim_host(host);
2695 mmc_detach_bus(host);
2696 mmc_power_off(host);
2697 mmc_release_host(host);
2703 mmc_claim_host(host);
2704 mmc_power_off(host);
2705 mmc_release_host(host);
2708 #ifdef CONFIG_PM_SLEEP
2709 /* Do the card removal on suspend if card is assumed removeable
2710 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2713 static int mmc_pm_notify(struct notifier_block *notify_block,
2714 unsigned long mode, void *unused)
2716 struct mmc_host *host = container_of(
2717 notify_block, struct mmc_host, pm_notify);
2718 unsigned long flags;
2722 case PM_HIBERNATION_PREPARE:
2723 case PM_SUSPEND_PREPARE:
2724 case PM_RESTORE_PREPARE:
2725 spin_lock_irqsave(&host->lock, flags);
2726 host->rescan_disable = 1;
2727 spin_unlock_irqrestore(&host->lock, flags);
2728 cancel_delayed_work_sync(&host->detect);
2733 /* Validate prerequisites for suspend */
2734 if (host->bus_ops->pre_suspend)
2735 err = host->bus_ops->pre_suspend(host);
2739 if (!mmc_card_is_removable(host)) {
2740 dev_warn(mmc_dev(host),
2741 "pre_suspend failed for non-removable host: "
2743 /* Avoid removing non-removable hosts */
2747 /* Calling bus_ops->remove() with a claimed host can deadlock */
2748 host->bus_ops->remove(host);
2749 mmc_claim_host(host);
2750 mmc_detach_bus(host);
2751 mmc_power_off(host);
2752 mmc_release_host(host);
2756 case PM_POST_SUSPEND:
2757 case PM_POST_HIBERNATION:
2758 case PM_POST_RESTORE:
2760 spin_lock_irqsave(&host->lock, flags);
2761 host->rescan_disable = 0;
2762 spin_unlock_irqrestore(&host->lock, flags);
2763 _mmc_detect_change(host, 0, false);
2770 void mmc_register_pm_notifier(struct mmc_host *host)
2772 host->pm_notify.notifier_call = mmc_pm_notify;
2773 register_pm_notifier(&host->pm_notify);
2776 void mmc_unregister_pm_notifier(struct mmc_host *host)
2778 unregister_pm_notifier(&host->pm_notify);
2782 static int __init mmc_init(void)
2786 ret = mmc_register_bus();
2790 ret = mmc_register_host_class();
2792 goto unregister_bus;
2794 ret = sdio_register_bus();
2796 goto unregister_host_class;
2800 unregister_host_class:
2801 mmc_unregister_host_class();
2803 mmc_unregister_bus();
2807 static void __exit mmc_exit(void)
2809 sdio_unregister_bus();
2810 mmc_unregister_host_class();
2811 mmc_unregister_bus();
2814 subsys_initcall(mmc_init);
2815 module_exit(mmc_exit);
2817 MODULE_LICENSE("GPL");