1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/mmc/core/core.c
5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
7 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
8 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/completion.h>
14 #include <linux/device.h>
15 #include <linux/delay.h>
16 #include <linux/pagemap.h>
17 #include <linux/err.h>
18 #include <linux/leds.h>
19 #include <linux/scatterlist.h>
20 #include <linux/log2.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/pm_wakeup.h>
23 #include <linux/suspend.h>
24 #include <linux/fault-inject.h>
25 #include <linux/random.h>
26 #include <linux/slab.h>
29 #include <linux/mmc/card.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/sd.h>
33 #include <linux/mmc/slot-gpio.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/mmc.h>
49 /* The max erase timeout, used when host->max_busy_timeout isn't specified */
50 #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
51 #define SD_DISCARD_TIMEOUT_MS (250)
53 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
56 * Enabling software CRCs on the data blocks can be a significant (30%)
57 * performance cost, and for other reasons may not always be desired.
58 * So we allow it it to be disabled.
61 module_param(use_spi_crc, bool, 0);
63 static int mmc_schedule_delayed_work(struct delayed_work *work,
67 * We use the system_freezable_wq, because of two reasons.
68 * First, it allows several works (not the same work item) to be
69 * executed simultaneously. Second, the queue becomes frozen when
70 * userspace becomes frozen during system PM.
72 return queue_delayed_work(system_freezable_wq, work, delay);
75 #ifdef CONFIG_FAIL_MMC_REQUEST
78 * Internal function. Inject random data errors.
79 * If mmc_data is NULL no errors are injected.
81 static void mmc_should_fail_request(struct mmc_host *host,
82 struct mmc_request *mrq)
84 struct mmc_command *cmd = mrq->cmd;
85 struct mmc_data *data = mrq->data;
86 static const int data_errors[] = {
95 if ((cmd && cmd->error) || data->error ||
96 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
99 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
100 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
103 #else /* CONFIG_FAIL_MMC_REQUEST */
105 static inline void mmc_should_fail_request(struct mmc_host *host,
106 struct mmc_request *mrq)
110 #endif /* CONFIG_FAIL_MMC_REQUEST */
112 static inline void mmc_complete_cmd(struct mmc_request *mrq)
114 if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
115 complete_all(&mrq->cmd_completion);
118 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
120 if (!mrq->cap_cmd_during_tfr)
123 mmc_complete_cmd(mrq);
125 pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
126 mmc_hostname(host), mrq->cmd->opcode);
128 EXPORT_SYMBOL(mmc_command_done);
131 * mmc_request_done - finish processing an MMC request
132 * @host: MMC host which completed request
133 * @mrq: MMC request which request
135 * MMC drivers should call this function when they have completed
136 * their processing of a request.
138 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
140 struct mmc_command *cmd = mrq->cmd;
141 int err = cmd->error;
143 /* Flag re-tuning needed on CRC errors */
144 if (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
145 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200 &&
146 !host->retune_crc_disable &&
147 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
148 (mrq->data && mrq->data->error == -EILSEQ) ||
149 (mrq->stop && mrq->stop->error == -EILSEQ)))
150 mmc_retune_needed(host);
152 if (err && cmd->retries && mmc_host_is_spi(host)) {
153 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
157 if (host->ongoing_mrq == mrq)
158 host->ongoing_mrq = NULL;
160 mmc_complete_cmd(mrq);
162 trace_mmc_request_done(host, mrq);
165 * We list various conditions for the command to be considered
168 * - There was no error, OK fine then
169 * - We are not doing some kind of retry
170 * - The card was removed (...so just complete everything no matter
171 * if there are errors or retries)
173 if (!err || !cmd->retries || mmc_card_removed(host->card)) {
174 mmc_should_fail_request(host, mrq);
176 if (!host->ongoing_mrq)
177 led_trigger_event(host->led, LED_OFF);
180 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
181 mmc_hostname(host), mrq->sbc->opcode,
183 mrq->sbc->resp[0], mrq->sbc->resp[1],
184 mrq->sbc->resp[2], mrq->sbc->resp[3]);
187 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
188 mmc_hostname(host), cmd->opcode, err,
189 cmd->resp[0], cmd->resp[1],
190 cmd->resp[2], cmd->resp[3]);
193 pr_debug("%s: %d bytes transferred: %d\n",
195 mrq->data->bytes_xfered, mrq->data->error);
199 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
200 mmc_hostname(host), mrq->stop->opcode,
202 mrq->stop->resp[0], mrq->stop->resp[1],
203 mrq->stop->resp[2], mrq->stop->resp[3]);
207 * Request starter must handle retries - see
208 * mmc_wait_for_req_done().
214 EXPORT_SYMBOL(mmc_request_done);
216 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
220 /* Assumes host controller has been runtime resumed by mmc_claim_host */
221 err = mmc_retune(host);
223 mrq->cmd->error = err;
224 mmc_request_done(host, mrq);
229 * For sdio rw commands we must wait for card busy otherwise some
230 * sdio devices won't work properly.
231 * And bypass I/O abort, reset and bus suspend operations.
233 if (sdio_is_io_busy(mrq->cmd->opcode, mrq->cmd->arg) &&
234 host->ops->card_busy) {
235 int tries = 500; /* Wait aprox 500ms at maximum */
237 while (host->ops->card_busy(host) && --tries)
241 mrq->cmd->error = -EBUSY;
242 mmc_request_done(host, mrq);
247 if (mrq->cap_cmd_during_tfr) {
248 host->ongoing_mrq = mrq;
250 * Retry path could come through here without having waiting on
251 * cmd_completion, so ensure it is reinitialised.
253 reinit_completion(&mrq->cmd_completion);
256 trace_mmc_request_start(host, mrq);
259 host->cqe_ops->cqe_off(host);
261 host->ops->request(host, mrq);
264 static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq,
268 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
269 mmc_hostname(host), mrq->sbc->opcode,
270 mrq->sbc->arg, mrq->sbc->flags);
274 pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n",
275 mmc_hostname(host), cqe ? "CQE direct " : "",
276 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
278 pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n",
279 mmc_hostname(host), mrq->tag, mrq->data->blk_addr);
283 pr_debug("%s: blksz %d blocks %d flags %08x "
284 "tsac %d ms nsac %d\n",
285 mmc_hostname(host), mrq->data->blksz,
286 mrq->data->blocks, mrq->data->flags,
287 mrq->data->timeout_ns / 1000000,
288 mrq->data->timeout_clks);
292 pr_debug("%s: CMD%u arg %08x flags %08x\n",
293 mmc_hostname(host), mrq->stop->opcode,
294 mrq->stop->arg, mrq->stop->flags);
298 static int mmc_mrq_prep(struct mmc_host *host, struct mmc_request *mrq)
300 unsigned int i, sz = 0;
301 struct scatterlist *sg;
306 mrq->cmd->data = mrq->data;
313 if (mrq->data->blksz > host->max_blk_size ||
314 mrq->data->blocks > host->max_blk_count ||
315 mrq->data->blocks * mrq->data->blksz > host->max_req_size)
318 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
320 if (sz != mrq->data->blocks * mrq->data->blksz)
323 mrq->data->error = 0;
324 mrq->data->mrq = mrq;
326 mrq->data->stop = mrq->stop;
327 mrq->stop->error = 0;
328 mrq->stop->mrq = mrq;
335 int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
339 init_completion(&mrq->cmd_completion);
341 mmc_retune_hold(host);
343 if (mmc_card_removed(host->card))
346 mmc_mrq_pr_debug(host, mrq, false);
348 WARN_ON(!host->claimed);
350 err = mmc_mrq_prep(host, mrq);
354 led_trigger_event(host->led, LED_FULL);
355 __mmc_start_request(host, mrq);
359 EXPORT_SYMBOL(mmc_start_request);
361 static void mmc_wait_done(struct mmc_request *mrq)
363 complete(&mrq->completion);
366 static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
368 struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
371 * If there is an ongoing transfer, wait for the command line to become
374 if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
375 wait_for_completion(&ongoing_mrq->cmd_completion);
378 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
382 mmc_wait_ongoing_tfr_cmd(host);
384 init_completion(&mrq->completion);
385 mrq->done = mmc_wait_done;
387 err = mmc_start_request(host, mrq);
389 mrq->cmd->error = err;
390 mmc_complete_cmd(mrq);
391 complete(&mrq->completion);
397 void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
399 struct mmc_command *cmd;
402 wait_for_completion(&mrq->completion);
406 if (!cmd->error || !cmd->retries ||
407 mmc_card_removed(host->card))
410 mmc_retune_recheck(host);
412 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
413 mmc_hostname(host), cmd->opcode, cmd->error);
416 __mmc_start_request(host, mrq);
419 mmc_retune_release(host);
421 EXPORT_SYMBOL(mmc_wait_for_req_done);
424 * mmc_cqe_start_req - Start a CQE request.
425 * @host: MMC host to start the request
426 * @mrq: request to start
428 * Start the request, re-tuning if needed and it is possible. Returns an error
429 * code if the request fails to start or -EBUSY if CQE is busy.
431 int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
436 * CQE cannot process re-tuning commands. Caller must hold retuning
437 * while CQE is in use. Re-tuning can happen here only when CQE has no
438 * active requests i.e. this is the first. Note, re-tuning will call
441 err = mmc_retune(host);
447 mmc_mrq_pr_debug(host, mrq, true);
449 err = mmc_mrq_prep(host, mrq);
453 err = host->cqe_ops->cqe_request(host, mrq);
457 trace_mmc_request_start(host, mrq);
463 pr_debug("%s: failed to start CQE direct CMD%u, error %d\n",
464 mmc_hostname(host), mrq->cmd->opcode, err);
466 pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n",
467 mmc_hostname(host), mrq->tag, err);
471 EXPORT_SYMBOL(mmc_cqe_start_req);
474 * mmc_cqe_request_done - CQE has finished processing an MMC request
475 * @host: MMC host which completed request
476 * @mrq: MMC request which completed
478 * CQE drivers should call this function when they have completed
479 * their processing of a request.
481 void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
483 mmc_should_fail_request(host, mrq);
485 /* Flag re-tuning needed on CRC errors */
486 if ((mrq->cmd && mrq->cmd->error == -EILSEQ) ||
487 (mrq->data && mrq->data->error == -EILSEQ))
488 mmc_retune_needed(host);
490 trace_mmc_request_done(host, mrq);
493 pr_debug("%s: CQE req done (direct CMD%u): %d\n",
494 mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error);
496 pr_debug("%s: CQE transfer done tag %d\n",
497 mmc_hostname(host), mrq->tag);
501 pr_debug("%s: %d bytes transferred: %d\n",
503 mrq->data->bytes_xfered, mrq->data->error);
508 EXPORT_SYMBOL(mmc_cqe_request_done);
511 * mmc_cqe_post_req - CQE post process of a completed MMC request
513 * @mrq: MMC request to be processed
515 void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq)
517 if (host->cqe_ops->cqe_post_req)
518 host->cqe_ops->cqe_post_req(host, mrq);
520 EXPORT_SYMBOL(mmc_cqe_post_req);
522 /* Arbitrary 1 second timeout */
523 #define MMC_CQE_RECOVERY_TIMEOUT 1000
526 * mmc_cqe_recovery - Recover from CQE errors.
527 * @host: MMC host to recover
529 * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in
530 * in eMMC, and discarding the queue in CQE. CQE must call
531 * mmc_cqe_request_done() on all requests. An error is returned if the eMMC
532 * fails to discard its queue.
534 int mmc_cqe_recovery(struct mmc_host *host)
536 struct mmc_command cmd;
539 mmc_retune_hold_now(host);
542 * Recovery is expected seldom, if at all, but it reduces performance,
543 * so make sure it is not completely silent.
545 pr_warn("%s: running CQE recovery\n", mmc_hostname(host));
547 host->cqe_ops->cqe_recovery_start(host);
549 memset(&cmd, 0, sizeof(cmd));
550 cmd.opcode = MMC_STOP_TRANSMISSION,
551 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC,
552 cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
553 cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
554 mmc_wait_for_cmd(host, &cmd, 0);
556 memset(&cmd, 0, sizeof(cmd));
557 cmd.opcode = MMC_CMDQ_TASK_MGMT;
558 cmd.arg = 1; /* Discard entire queue */
559 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
560 cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
561 cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
562 err = mmc_wait_for_cmd(host, &cmd, 0);
564 host->cqe_ops->cqe_recovery_finish(host);
566 mmc_retune_release(host);
570 EXPORT_SYMBOL(mmc_cqe_recovery);
573 * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
577 * mmc_is_req_done() is used with requests that have
578 * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
579 * starting a request and before waiting for it to complete. That is,
580 * either in between calls to mmc_start_req(), or after mmc_wait_for_req()
581 * and before mmc_wait_for_req_done(). If it is called at other times the
582 * result is not meaningful.
584 bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
586 return completion_done(&mrq->completion);
588 EXPORT_SYMBOL(mmc_is_req_done);
591 * mmc_wait_for_req - start a request and wait for completion
592 * @host: MMC host to start command
593 * @mrq: MMC request to start
595 * Start a new MMC custom command request for a host, and wait
596 * for the command to complete. In the case of 'cap_cmd_during_tfr'
597 * requests, the transfer is ongoing and the caller can issue further
598 * commands that do not use the data lines, and then wait by calling
599 * mmc_wait_for_req_done().
600 * Does not attempt to parse the response.
602 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
604 __mmc_start_req(host, mrq);
606 if (!mrq->cap_cmd_during_tfr)
607 mmc_wait_for_req_done(host, mrq);
609 EXPORT_SYMBOL(mmc_wait_for_req);
612 * mmc_wait_for_cmd - start a command and wait for completion
613 * @host: MMC host to start command
614 * @cmd: MMC command to start
615 * @retries: maximum number of retries
617 * Start a new MMC command for a host, and wait for the command
618 * to complete. Return any error that occurred while the command
619 * was executing. Do not attempt to parse the response.
621 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
623 struct mmc_request mrq = {};
625 WARN_ON(!host->claimed);
627 memset(cmd->resp, 0, sizeof(cmd->resp));
628 cmd->retries = retries;
633 mmc_wait_for_req(host, &mrq);
638 EXPORT_SYMBOL(mmc_wait_for_cmd);
641 * mmc_set_data_timeout - set the timeout for a data command
642 * @data: data phase for command
643 * @card: the MMC card associated with the data transfer
645 * Computes the data timeout parameters according to the
646 * correct algorithm given the card type.
648 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
653 * SDIO cards only define an upper 1 s limit on access.
655 if (mmc_card_sdio(card)) {
656 data->timeout_ns = 1000000000;
657 data->timeout_clks = 0;
662 * SD cards use a 100 multiplier rather than 10
664 mult = mmc_card_sd(card) ? 100 : 10;
667 * Scale up the multiplier (and therefore the timeout) by
668 * the r2w factor for writes.
670 if (data->flags & MMC_DATA_WRITE)
671 mult <<= card->csd.r2w_factor;
673 data->timeout_ns = card->csd.taac_ns * mult;
674 data->timeout_clks = card->csd.taac_clks * mult;
677 * SD cards also have an upper limit on the timeout.
679 if (mmc_card_sd(card)) {
680 unsigned int timeout_us, limit_us;
682 timeout_us = data->timeout_ns / 1000;
683 if (card->host->ios.clock)
684 timeout_us += data->timeout_clks * 1000 /
685 (card->host->ios.clock / 1000);
687 if (data->flags & MMC_DATA_WRITE)
689 * The MMC spec "It is strongly recommended
690 * for hosts to implement more than 500ms
691 * timeout value even if the card indicates
692 * the 250ms maximum busy length." Even the
693 * previous value of 300ms is known to be
694 * insufficient for some cards.
701 * SDHC cards always use these fixed values.
703 if (timeout_us > limit_us) {
704 data->timeout_ns = limit_us * 1000;
705 data->timeout_clks = 0;
708 /* assign limit value if invalid */
710 data->timeout_ns = limit_us * 1000;
714 * Some cards require longer data read timeout than indicated in CSD.
715 * Address this by setting the read timeout to a "reasonably high"
716 * value. For the cards tested, 600ms has proven enough. If necessary,
717 * this value can be increased if other problematic cards require this.
719 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
720 data->timeout_ns = 600000000;
721 data->timeout_clks = 0;
725 * Some cards need very high timeouts if driven in SPI mode.
726 * The worst observed timeout was 900ms after writing a
727 * continuous stream of data until the internal logic
730 if (mmc_host_is_spi(card->host)) {
731 if (data->flags & MMC_DATA_WRITE) {
732 if (data->timeout_ns < 1000000000)
733 data->timeout_ns = 1000000000; /* 1s */
735 if (data->timeout_ns < 100000000)
736 data->timeout_ns = 100000000; /* 100ms */
740 EXPORT_SYMBOL(mmc_set_data_timeout);
743 * Allow claiming an already claimed host if the context is the same or there is
744 * no context but the task is the same.
746 static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
747 struct task_struct *task)
749 return host->claimer == ctx ||
750 (!ctx && task && host->claimer->task == task);
753 static inline void mmc_ctx_set_claimer(struct mmc_host *host,
755 struct task_struct *task)
757 if (!host->claimer) {
761 host->claimer = &host->default_ctx;
764 host->claimer->task = task;
768 * __mmc_claim_host - exclusively claim a host
769 * @host: mmc host to claim
770 * @ctx: context that claims the host or NULL in which case the default
771 * context will be used
772 * @abort: whether or not the operation should be aborted
774 * Claim a host for a set of operations. If @abort is non null and
775 * dereference a non-zero value then this will return prematurely with
776 * that non-zero value without acquiring the lock. Returns zero
777 * with the lock held otherwise.
779 int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
782 struct task_struct *task = ctx ? NULL : current;
783 DECLARE_WAITQUEUE(wait, current);
790 add_wait_queue(&host->wq, &wait);
791 spin_lock_irqsave(&host->lock, flags);
793 set_current_state(TASK_UNINTERRUPTIBLE);
794 stop = abort ? atomic_read(abort) : 0;
795 if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
797 spin_unlock_irqrestore(&host->lock, flags);
799 spin_lock_irqsave(&host->lock, flags);
801 set_current_state(TASK_RUNNING);
804 mmc_ctx_set_claimer(host, ctx, task);
805 host->claim_cnt += 1;
806 if (host->claim_cnt == 1)
810 spin_unlock_irqrestore(&host->lock, flags);
811 remove_wait_queue(&host->wq, &wait);
814 pm_runtime_get_sync(mmc_dev(host));
818 EXPORT_SYMBOL(__mmc_claim_host);
821 * mmc_release_host - release a host
822 * @host: mmc host to release
824 * Release a MMC host, allowing others to claim the host
825 * for their operations.
827 void mmc_release_host(struct mmc_host *host)
831 WARN_ON(!host->claimed);
833 spin_lock_irqsave(&host->lock, flags);
834 if (--host->claim_cnt) {
835 /* Release for nested claim */
836 spin_unlock_irqrestore(&host->lock, flags);
839 host->claimer->task = NULL;
840 host->claimer = NULL;
841 spin_unlock_irqrestore(&host->lock, flags);
843 pm_runtime_mark_last_busy(mmc_dev(host));
844 if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
845 pm_runtime_put_sync_suspend(mmc_dev(host));
847 pm_runtime_put_autosuspend(mmc_dev(host));
850 EXPORT_SYMBOL(mmc_release_host);
853 * This is a helper function, which fetches a runtime pm reference for the
854 * card device and also claims the host.
856 void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
858 pm_runtime_get_sync(&card->dev);
859 __mmc_claim_host(card->host, ctx, NULL);
861 EXPORT_SYMBOL(mmc_get_card);
864 * This is a helper function, which releases the host and drops the runtime
865 * pm reference for the card device.
867 void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
869 struct mmc_host *host = card->host;
871 WARN_ON(ctx && host->claimer != ctx);
873 mmc_release_host(host);
874 pm_runtime_mark_last_busy(&card->dev);
875 pm_runtime_put_autosuspend(&card->dev);
877 EXPORT_SYMBOL(mmc_put_card);
880 * Internal function that does the actual ios call to the host driver,
881 * optionally printing some debug output.
883 static inline void mmc_set_ios(struct mmc_host *host)
885 struct mmc_ios *ios = &host->ios;
887 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
888 "width %u timing %u\n",
889 mmc_hostname(host), ios->clock, ios->bus_mode,
890 ios->power_mode, ios->chip_select, ios->vdd,
891 1 << ios->bus_width, ios->timing);
893 host->ops->set_ios(host, ios);
897 * Control chip select pin on a host.
899 void mmc_set_chip_select(struct mmc_host *host, int mode)
901 host->ios.chip_select = mode;
906 * Sets the host clock to the highest possible frequency that
909 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
911 WARN_ON(hz && hz < host->f_min);
913 if (hz > host->f_max)
916 host->ios.clock = hz;
920 int mmc_execute_tuning(struct mmc_card *card)
922 struct mmc_host *host = card->host;
926 if (!host->ops->execute_tuning)
930 host->cqe_ops->cqe_off(host);
932 if (mmc_card_mmc(card))
933 opcode = MMC_SEND_TUNING_BLOCK_HS200;
935 opcode = MMC_SEND_TUNING_BLOCK;
937 err = host->ops->execute_tuning(host, opcode);
940 pr_err("%s: tuning execution failed: %d\n",
941 mmc_hostname(host), err);
943 host->retune_now = 0;
944 host->need_retune = 0;
945 mmc_retune_enable(host);
952 * Change the bus mode (open drain/push-pull) of a host.
954 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
956 host->ios.bus_mode = mode;
961 * Change data bus width of a host.
963 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
965 host->ios.bus_width = width;
970 * Set initial state after a power cycle or a hw_reset.
972 void mmc_set_initial_state(struct mmc_host *host)
975 host->cqe_ops->cqe_off(host);
977 mmc_retune_disable(host);
979 if (mmc_host_is_spi(host))
980 host->ios.chip_select = MMC_CS_HIGH;
982 host->ios.chip_select = MMC_CS_DONTCARE;
983 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
984 host->ios.bus_width = MMC_BUS_WIDTH_1;
985 host->ios.timing = MMC_TIMING_LEGACY;
986 host->ios.drv_type = 0;
987 host->ios.enhanced_strobe = false;
990 * Make sure we are in non-enhanced strobe mode before we
991 * actually enable it in ext_csd.
993 if ((host->caps2 & MMC_CAP2_HS400_ES) &&
994 host->ops->hs400_enhanced_strobe)
995 host->ops->hs400_enhanced_strobe(host, &host->ios);
1001 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1002 * @vdd: voltage (mV)
1003 * @low_bits: prefer low bits in boundary cases
1005 * This function returns the OCR bit number according to the provided @vdd
1006 * value. If conversion is not possible a negative errno value returned.
1008 * Depending on the @low_bits flag the function prefers low or high OCR bits
1009 * on boundary voltages. For example,
1010 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1011 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1013 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1015 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1017 const int max_bit = ilog2(MMC_VDD_35_36);
1020 if (vdd < 1650 || vdd > 3600)
1023 if (vdd >= 1650 && vdd <= 1950)
1024 return ilog2(MMC_VDD_165_195);
1029 /* Base 2000 mV, step 100 mV, bit's base 8. */
1030 bit = (vdd - 2000) / 100 + 8;
1037 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1038 * @vdd_min: minimum voltage value (mV)
1039 * @vdd_max: maximum voltage value (mV)
1041 * This function returns the OCR mask bits according to the provided @vdd_min
1042 * and @vdd_max values. If conversion is not possible the function returns 0.
1044 * Notes wrt boundary cases:
1045 * This function sets the OCR bits for all boundary voltages, for example
1046 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1047 * MMC_VDD_34_35 mask.
1049 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1053 if (vdd_max < vdd_min)
1056 /* Prefer high bits for the boundary vdd_max values. */
1057 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1061 /* Prefer low bits for the boundary vdd_min values. */
1062 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1066 /* Fill the mask, from max bit to min bit. */
1067 while (vdd_max >= vdd_min)
1068 mask |= 1 << vdd_max--;
1073 static int mmc_of_get_func_num(struct device_node *node)
1078 ret = of_property_read_u32(node, "reg", ®);
1085 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1088 struct device_node *node;
1090 if (!host->parent || !host->parent->of_node)
1093 for_each_child_of_node(host->parent->of_node, node) {
1094 if (mmc_of_get_func_num(node) == func_num)
1102 * Mask off any voltages we don't support and select
1103 * the lowest voltage
1105 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1110 * Sanity check the voltages that the card claims to
1114 dev_warn(mmc_dev(host),
1115 "card claims to support voltages below defined range\n");
1119 ocr &= host->ocr_avail;
1121 dev_warn(mmc_dev(host), "no support for card's volts\n");
1125 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1128 mmc_power_cycle(host, ocr);
1132 if (bit != host->ios.vdd)
1133 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1139 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1142 int old_signal_voltage = host->ios.signal_voltage;
1144 host->ios.signal_voltage = signal_voltage;
1145 if (host->ops->start_signal_voltage_switch)
1146 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1149 host->ios.signal_voltage = old_signal_voltage;
1155 void mmc_set_initial_signal_voltage(struct mmc_host *host)
1157 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1158 if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330))
1159 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1160 else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1161 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1162 else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120))
1163 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1166 int mmc_host_set_uhs_voltage(struct mmc_host *host)
1171 * During a signal voltage level switch, the clock must be gated
1172 * for 5 ms according to the SD spec
1174 clock = host->ios.clock;
1175 host->ios.clock = 0;
1178 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1181 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1183 host->ios.clock = clock;
1189 int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
1191 struct mmc_command cmd = {};
1195 * If we cannot switch voltages, return failure so the caller
1196 * can continue without UHS mode
1198 if (!host->ops->start_signal_voltage_switch)
1200 if (!host->ops->card_busy)
1201 pr_warn("%s: cannot verify signal voltage switch\n",
1202 mmc_hostname(host));
1204 cmd.opcode = SD_SWITCH_VOLTAGE;
1206 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1208 err = mmc_wait_for_cmd(host, &cmd, 0);
1212 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1216 * The card should drive cmd and dat[0:3] low immediately
1217 * after the response of cmd11, but wait 1 ms to be sure
1220 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1225 if (mmc_host_set_uhs_voltage(host)) {
1227 * Voltages may not have been switched, but we've already
1228 * sent CMD11, so a power cycle is required anyway
1234 /* Wait for at least 1 ms according to spec */
1238 * Failure to switch is indicated by the card holding
1241 if (host->ops->card_busy && host->ops->card_busy(host))
1246 pr_debug("%s: Signal voltage switch failed, "
1247 "power cycling card\n", mmc_hostname(host));
1248 mmc_power_cycle(host, ocr);
1255 * Select timing parameters for host.
1257 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1259 host->ios.timing = timing;
1264 * Select appropriate driver type for host.
1266 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1268 host->ios.drv_type = drv_type;
1272 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1273 int card_drv_type, int *drv_type)
1275 struct mmc_host *host = card->host;
1276 int host_drv_type = SD_DRIVER_TYPE_B;
1280 if (!host->ops->select_drive_strength)
1283 /* Use SD definition of driver strength for hosts */
1284 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1285 host_drv_type |= SD_DRIVER_TYPE_A;
1287 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1288 host_drv_type |= SD_DRIVER_TYPE_C;
1290 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1291 host_drv_type |= SD_DRIVER_TYPE_D;
1294 * The drive strength that the hardware can support
1295 * depends on the board design. Pass the appropriate
1296 * information and let the hardware specific code
1297 * return what is possible given the options
1299 return host->ops->select_drive_strength(card, max_dtr,
1306 * Apply power to the MMC stack. This is a two-stage process.
1307 * First, we enable power to the card without the clock running.
1308 * We then wait a bit for the power to stabilise. Finally,
1309 * enable the bus drivers and clock to the card.
1311 * We must _NOT_ enable the clock prior to power stablising.
1313 * If a host does all the power sequencing itself, ignore the
1314 * initial MMC_POWER_UP stage.
1316 void mmc_power_up(struct mmc_host *host, u32 ocr)
1318 if (host->ios.power_mode == MMC_POWER_ON)
1321 mmc_pwrseq_pre_power_on(host);
1323 host->ios.vdd = fls(ocr) - 1;
1324 host->ios.power_mode = MMC_POWER_UP;
1325 /* Set initial state and call mmc_set_ios */
1326 mmc_set_initial_state(host);
1328 mmc_set_initial_signal_voltage(host);
1331 * This delay should be sufficient to allow the power supply
1332 * to reach the minimum voltage.
1334 mmc_delay(host->ios.power_delay_ms);
1336 mmc_pwrseq_post_power_on(host);
1338 host->ios.clock = host->f_init;
1340 host->ios.power_mode = MMC_POWER_ON;
1344 * This delay must be at least 74 clock sizes, or 1 ms, or the
1345 * time required to reach a stable voltage.
1347 mmc_delay(host->ios.power_delay_ms);
1350 void mmc_power_off(struct mmc_host *host)
1352 if (host->ios.power_mode == MMC_POWER_OFF)
1355 mmc_pwrseq_power_off(host);
1357 host->ios.clock = 0;
1360 host->ios.power_mode = MMC_POWER_OFF;
1361 /* Set initial state and call mmc_set_ios */
1362 mmc_set_initial_state(host);
1365 * Some configurations, such as the 802.11 SDIO card in the OLPC
1366 * XO-1.5, require a short delay after poweroff before the card
1367 * can be successfully turned on again.
1372 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1374 mmc_power_off(host);
1375 /* Wait at least 1 ms according to SD spec */
1377 mmc_power_up(host, ocr);
1381 * Cleanup when the last reference to the bus operator is dropped.
1383 static void __mmc_release_bus(struct mmc_host *host)
1385 WARN_ON(!host->bus_dead);
1387 host->bus_ops = NULL;
1391 * Increase reference count of bus operator
1393 static inline void mmc_bus_get(struct mmc_host *host)
1395 unsigned long flags;
1397 spin_lock_irqsave(&host->lock, flags);
1399 spin_unlock_irqrestore(&host->lock, flags);
1403 * Decrease reference count of bus operator and free it if
1404 * it is the last reference.
1406 static inline void mmc_bus_put(struct mmc_host *host)
1408 unsigned long flags;
1410 spin_lock_irqsave(&host->lock, flags);
1412 if ((host->bus_refs == 0) && host->bus_ops)
1413 __mmc_release_bus(host);
1414 spin_unlock_irqrestore(&host->lock, flags);
1418 * Assign a mmc bus handler to a host. Only one bus handler may control a
1419 * host at any given time.
1421 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1423 unsigned long flags;
1425 WARN_ON(!host->claimed);
1427 spin_lock_irqsave(&host->lock, flags);
1429 WARN_ON(host->bus_ops);
1430 WARN_ON(host->bus_refs);
1432 host->bus_ops = ops;
1436 spin_unlock_irqrestore(&host->lock, flags);
1440 * Remove the current bus handler from a host.
1442 void mmc_detach_bus(struct mmc_host *host)
1444 unsigned long flags;
1446 WARN_ON(!host->claimed);
1447 WARN_ON(!host->bus_ops);
1449 spin_lock_irqsave(&host->lock, flags);
1453 spin_unlock_irqrestore(&host->lock, flags);
1458 void _mmc_detect_change(struct mmc_host *host, unsigned long delay, bool cd_irq)
1461 * Prevent system sleep for 5s to allow user space to consume the
1462 * corresponding uevent. This is especially useful, when CD irq is used
1463 * as a system wakeup, but doesn't hurt in other cases.
1465 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL))
1466 __pm_wakeup_event(host->ws, 5000);
1468 host->detect_change = 1;
1469 mmc_schedule_delayed_work(&host->detect, delay);
1473 * mmc_detect_change - process change of state on a MMC socket
1474 * @host: host which changed state.
1475 * @delay: optional delay to wait before detection (jiffies)
1477 * MMC drivers should call this when they detect a card has been
1478 * inserted or removed. The MMC layer will confirm that any
1479 * present card is still functional, and initialize any newly
1482 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1484 _mmc_detect_change(host, delay, true);
1486 EXPORT_SYMBOL(mmc_detect_change);
1488 void mmc_init_erase(struct mmc_card *card)
1492 if (is_power_of_2(card->erase_size))
1493 card->erase_shift = ffs(card->erase_size) - 1;
1495 card->erase_shift = 0;
1498 * It is possible to erase an arbitrarily large area of an SD or MMC
1499 * card. That is not desirable because it can take a long time
1500 * (minutes) potentially delaying more important I/O, and also the
1501 * timeout calculations become increasingly hugely over-estimated.
1502 * Consequently, 'pref_erase' is defined as a guide to limit erases
1503 * to that size and alignment.
1505 * For SD cards that define Allocation Unit size, limit erases to one
1506 * Allocation Unit at a time.
1507 * For MMC, have a stab at ai good value and for modern cards it will
1508 * end up being 4MiB. Note that if the value is too small, it can end
1509 * up taking longer to erase. Also note, erase_size is already set to
1510 * High Capacity Erase Size if available when this function is called.
1512 if (mmc_card_sd(card) && card->ssr.au) {
1513 card->pref_erase = card->ssr.au;
1514 card->erase_shift = ffs(card->ssr.au) - 1;
1515 } else if (card->erase_size) {
1516 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1518 card->pref_erase = 512 * 1024 / 512;
1520 card->pref_erase = 1024 * 1024 / 512;
1522 card->pref_erase = 2 * 1024 * 1024 / 512;
1524 card->pref_erase = 4 * 1024 * 1024 / 512;
1525 if (card->pref_erase < card->erase_size)
1526 card->pref_erase = card->erase_size;
1528 sz = card->pref_erase % card->erase_size;
1530 card->pref_erase += card->erase_size - sz;
1533 card->pref_erase = 0;
1536 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1537 unsigned int arg, unsigned int qty)
1539 unsigned int erase_timeout;
1541 if (arg == MMC_DISCARD_ARG ||
1542 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1543 erase_timeout = card->ext_csd.trim_timeout;
1544 } else if (card->ext_csd.erase_group_def & 1) {
1545 /* High Capacity Erase Group Size uses HC timeouts */
1546 if (arg == MMC_TRIM_ARG)
1547 erase_timeout = card->ext_csd.trim_timeout;
1549 erase_timeout = card->ext_csd.hc_erase_timeout;
1551 /* CSD Erase Group Size uses write timeout */
1552 unsigned int mult = (10 << card->csd.r2w_factor);
1553 unsigned int timeout_clks = card->csd.taac_clks * mult;
1554 unsigned int timeout_us;
1556 /* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */
1557 if (card->csd.taac_ns < 1000000)
1558 timeout_us = (card->csd.taac_ns * mult) / 1000;
1560 timeout_us = (card->csd.taac_ns / 1000) * mult;
1563 * ios.clock is only a target. The real clock rate might be
1564 * less but not that much less, so fudge it by multiplying by 2.
1567 timeout_us += (timeout_clks * 1000) /
1568 (card->host->ios.clock / 1000);
1570 erase_timeout = timeout_us / 1000;
1573 * Theoretically, the calculation could underflow so round up
1574 * to 1ms in that case.
1580 /* Multiplier for secure operations */
1581 if (arg & MMC_SECURE_ARGS) {
1582 if (arg == MMC_SECURE_ERASE_ARG)
1583 erase_timeout *= card->ext_csd.sec_erase_mult;
1585 erase_timeout *= card->ext_csd.sec_trim_mult;
1588 erase_timeout *= qty;
1591 * Ensure at least a 1 second timeout for SPI as per
1592 * 'mmc_set_data_timeout()'
1594 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1595 erase_timeout = 1000;
1597 return erase_timeout;
1600 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1604 unsigned int erase_timeout;
1606 /* for DISCARD none of the below calculation applies.
1607 * the busy timeout is 250msec per discard command.
1609 if (arg == SD_DISCARD_ARG)
1610 return SD_DISCARD_TIMEOUT_MS;
1612 if (card->ssr.erase_timeout) {
1613 /* Erase timeout specified in SD Status Register (SSR) */
1614 erase_timeout = card->ssr.erase_timeout * qty +
1615 card->ssr.erase_offset;
1618 * Erase timeout not specified in SD Status Register (SSR) so
1619 * use 250ms per write block.
1621 erase_timeout = 250 * qty;
1624 /* Must not be less than 1 second */
1625 if (erase_timeout < 1000)
1626 erase_timeout = 1000;
1628 return erase_timeout;
1631 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1635 if (mmc_card_sd(card))
1636 return mmc_sd_erase_timeout(card, arg, qty);
1638 return mmc_mmc_erase_timeout(card, arg, qty);
1641 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1642 unsigned int to, unsigned int arg)
1644 struct mmc_command cmd = {};
1645 unsigned int qty = 0, busy_timeout = 0;
1646 bool use_r1b_resp = false;
1649 mmc_retune_hold(card->host);
1652 * qty is used to calculate the erase timeout which depends on how many
1653 * erase groups (or allocation units in SD terminology) are affected.
1654 * We count erasing part of an erase group as one erase group.
1655 * For SD, the allocation units are always a power of 2. For MMC, the
1656 * erase group size is almost certainly also power of 2, but it does not
1657 * seem to insist on that in the JEDEC standard, so we fall back to
1658 * division in that case. SD may not specify an allocation unit size,
1659 * in which case the timeout is based on the number of write blocks.
1661 * Note that the timeout for secure trim 2 will only be correct if the
1662 * number of erase groups specified is the same as the total of all
1663 * preceding secure trim 1 commands. Since the power may have been
1664 * lost since the secure trim 1 commands occurred, it is generally
1665 * impossible to calculate the secure trim 2 timeout correctly.
1667 if (card->erase_shift)
1668 qty += ((to >> card->erase_shift) -
1669 (from >> card->erase_shift)) + 1;
1670 else if (mmc_card_sd(card))
1671 qty += to - from + 1;
1673 qty += ((to / card->erase_size) -
1674 (from / card->erase_size)) + 1;
1676 if (!mmc_card_blockaddr(card)) {
1681 if (mmc_card_sd(card))
1682 cmd.opcode = SD_ERASE_WR_BLK_START;
1684 cmd.opcode = MMC_ERASE_GROUP_START;
1686 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1687 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1689 pr_err("mmc_erase: group start error %d, "
1690 "status %#x\n", err, cmd.resp[0]);
1695 memset(&cmd, 0, sizeof(struct mmc_command));
1696 if (mmc_card_sd(card))
1697 cmd.opcode = SD_ERASE_WR_BLK_END;
1699 cmd.opcode = MMC_ERASE_GROUP_END;
1701 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1702 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1704 pr_err("mmc_erase: group end error %d, status %#x\n",
1710 memset(&cmd, 0, sizeof(struct mmc_command));
1711 cmd.opcode = MMC_ERASE;
1713 busy_timeout = mmc_erase_timeout(card, arg, qty);
1715 * If the host controller supports busy signalling and the timeout for
1716 * the erase operation does not exceed the max_busy_timeout, we should
1717 * use R1B response. Or we need to prevent the host from doing hw busy
1718 * detection, which is done by converting to a R1 response instead.
1719 * Note, some hosts requires R1B, which also means they are on their own
1720 * when it comes to deal with the busy timeout.
1722 if (!(card->host->caps & MMC_CAP_NEED_RSP_BUSY) &&
1723 card->host->max_busy_timeout &&
1724 busy_timeout > card->host->max_busy_timeout) {
1725 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1727 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1728 cmd.busy_timeout = busy_timeout;
1729 use_r1b_resp = true;
1732 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1734 pr_err("mmc_erase: erase error %d, status %#x\n",
1740 if (mmc_host_is_spi(card->host))
1744 * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
1747 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
1750 /* Let's poll to find out when the erase operation completes. */
1751 err = mmc_poll_for_busy(card, busy_timeout, MMC_BUSY_ERASE);
1754 mmc_retune_release(card->host);
1758 static unsigned int mmc_align_erase_size(struct mmc_card *card,
1763 unsigned int from_new = *from, nr_new = nr, rem;
1766 * When the 'card->erase_size' is power of 2, we can use round_up/down()
1767 * to align the erase size efficiently.
1769 if (is_power_of_2(card->erase_size)) {
1770 unsigned int temp = from_new;
1772 from_new = round_up(temp, card->erase_size);
1773 rem = from_new - temp;
1780 nr_new = round_down(nr_new, card->erase_size);
1782 rem = from_new % card->erase_size;
1784 rem = card->erase_size - rem;
1792 rem = nr_new % card->erase_size;
1800 *to = from_new + nr_new;
1807 * mmc_erase - erase sectors.
1808 * @card: card to erase
1809 * @from: first sector to erase
1810 * @nr: number of sectors to erase
1811 * @arg: erase command argument
1813 * Caller must claim host before calling this function.
1815 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
1818 unsigned int rem, to = from + nr;
1821 if (!(card->csd.cmdclass & CCC_ERASE))
1824 if (!card->erase_size)
1827 if (mmc_card_sd(card) && arg != SD_ERASE_ARG && arg != SD_DISCARD_ARG)
1830 if (mmc_card_mmc(card) && (arg & MMC_SECURE_ARGS) &&
1831 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
1834 if (mmc_card_mmc(card) && (arg & MMC_TRIM_ARGS) &&
1835 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
1838 if (arg == MMC_SECURE_ERASE_ARG) {
1839 if (from % card->erase_size || nr % card->erase_size)
1843 if (arg == MMC_ERASE_ARG)
1844 nr = mmc_align_erase_size(card, &from, &to, nr);
1852 /* 'from' and 'to' are inclusive */
1856 * Special case where only one erase-group fits in the timeout budget:
1857 * If the region crosses an erase-group boundary on this particular
1858 * case, we will be trimming more than one erase-group which, does not
1859 * fit in the timeout budget of the controller, so we need to split it
1860 * and call mmc_do_erase() twice if necessary. This special case is
1861 * identified by the card->eg_boundary flag.
1863 rem = card->erase_size - (from % card->erase_size);
1864 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
1865 err = mmc_do_erase(card, from, from + rem - 1, arg);
1867 if ((err) || (to <= from))
1871 return mmc_do_erase(card, from, to, arg);
1873 EXPORT_SYMBOL(mmc_erase);
1875 int mmc_can_erase(struct mmc_card *card)
1877 if (card->csd.cmdclass & CCC_ERASE && card->erase_size)
1881 EXPORT_SYMBOL(mmc_can_erase);
1883 int mmc_can_trim(struct mmc_card *card)
1885 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
1886 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
1890 EXPORT_SYMBOL(mmc_can_trim);
1892 int mmc_can_discard(struct mmc_card *card)
1895 * As there's no way to detect the discard support bit at v4.5
1896 * use the s/w feature support filed.
1898 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
1902 EXPORT_SYMBOL(mmc_can_discard);
1904 int mmc_can_sanitize(struct mmc_card *card)
1906 if (!mmc_can_trim(card) && !mmc_can_erase(card))
1908 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
1913 int mmc_can_secure_erase_trim(struct mmc_card *card)
1915 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
1916 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1920 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
1922 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
1925 if (!card->erase_size)
1927 if (from % card->erase_size || nr % card->erase_size)
1931 EXPORT_SYMBOL(mmc_erase_group_aligned);
1933 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
1936 struct mmc_host *host = card->host;
1937 unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
1938 unsigned int last_timeout = 0;
1939 unsigned int max_busy_timeout = host->max_busy_timeout ?
1940 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
1942 if (card->erase_shift) {
1943 max_qty = UINT_MAX >> card->erase_shift;
1944 min_qty = card->pref_erase >> card->erase_shift;
1945 } else if (mmc_card_sd(card)) {
1947 min_qty = card->pref_erase;
1949 max_qty = UINT_MAX / card->erase_size;
1950 min_qty = card->pref_erase / card->erase_size;
1954 * We should not only use 'host->max_busy_timeout' as the limitation
1955 * when deciding the max discard sectors. We should set a balance value
1956 * to improve the erase speed, and it can not get too long timeout at
1959 * Here we set 'card->pref_erase' as the minimal discard sectors no
1960 * matter what size of 'host->max_busy_timeout', but if the
1961 * 'host->max_busy_timeout' is large enough for more discard sectors,
1962 * then we can continue to increase the max discard sectors until we
1963 * get a balance value. In cases when the 'host->max_busy_timeout'
1964 * isn't specified, use the default max erase timeout.
1968 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
1969 timeout = mmc_erase_timeout(card, arg, qty + x);
1971 if (qty + x > min_qty && timeout > max_busy_timeout)
1974 if (timeout < last_timeout)
1976 last_timeout = timeout;
1986 * When specifying a sector range to trim, chances are we might cross
1987 * an erase-group boundary even if the amount of sectors is less than
1989 * If we can only fit one erase-group in the controller timeout budget,
1990 * we have to care that erase-group boundaries are not crossed by a
1991 * single trim operation. We flag that special case with "eg_boundary".
1992 * In all other cases we can just decrement qty and pretend that we
1993 * always touch (qty + 1) erase-groups as a simple optimization.
1996 card->eg_boundary = 1;
2000 /* Convert qty to sectors */
2001 if (card->erase_shift)
2002 max_discard = qty << card->erase_shift;
2003 else if (mmc_card_sd(card))
2004 max_discard = qty + 1;
2006 max_discard = qty * card->erase_size;
2011 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2013 struct mmc_host *host = card->host;
2014 unsigned int max_discard, max_trim;
2017 * Without erase_group_def set, MMC erase timeout depends on clock
2018 * frequence which can change. In that case, the best choice is
2019 * just the preferred erase size.
2021 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2022 return card->pref_erase;
2024 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2025 if (mmc_can_trim(card)) {
2026 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2027 if (max_trim < max_discard || max_discard == 0)
2028 max_discard = max_trim;
2029 } else if (max_discard < card->erase_size) {
2032 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2033 mmc_hostname(host), max_discard, host->max_busy_timeout ?
2034 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
2037 EXPORT_SYMBOL(mmc_calc_max_discard);
2039 bool mmc_card_is_blockaddr(struct mmc_card *card)
2041 return card ? mmc_card_blockaddr(card) : false;
2043 EXPORT_SYMBOL(mmc_card_is_blockaddr);
2045 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2047 struct mmc_command cmd = {};
2049 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
2050 mmc_card_hs400(card) || mmc_card_hs400es(card))
2053 cmd.opcode = MMC_SET_BLOCKLEN;
2055 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2056 return mmc_wait_for_cmd(card->host, &cmd, 5);
2058 EXPORT_SYMBOL(mmc_set_blocklen);
2060 static void mmc_hw_reset_for_init(struct mmc_host *host)
2062 mmc_pwrseq_reset(host);
2064 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2066 host->ops->hw_reset(host);
2070 * mmc_hw_reset - reset the card in hardware
2071 * @host: MMC host to which the card is attached
2073 * Hard reset the card. This function is only for upper layers, like the
2074 * block layer or card drivers. You cannot use it in host drivers (struct
2075 * mmc_card might be gone then).
2077 * Return: 0 on success, -errno on failure
2079 int mmc_hw_reset(struct mmc_host *host)
2087 if (!host->bus_ops || host->bus_dead || !host->bus_ops->hw_reset) {
2092 ret = host->bus_ops->hw_reset(host);
2096 pr_warn("%s: tried to HW reset card, got error %d\n",
2097 mmc_hostname(host), ret);
2101 EXPORT_SYMBOL(mmc_hw_reset);
2103 int mmc_sw_reset(struct mmc_host *host)
2111 if (!host->bus_ops || host->bus_dead || !host->bus_ops->sw_reset) {
2116 ret = host->bus_ops->sw_reset(host);
2120 pr_warn("%s: tried to SW reset card, got error %d\n",
2121 mmc_hostname(host), ret);
2125 EXPORT_SYMBOL(mmc_sw_reset);
2127 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2129 host->f_init = freq;
2131 pr_debug("%s: %s: trying to init card at %u Hz\n",
2132 mmc_hostname(host), __func__, host->f_init);
2134 mmc_power_up(host, host->ocr_avail);
2137 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2138 * do a hardware reset if possible.
2140 mmc_hw_reset_for_init(host);
2143 * sdio_reset sends CMD52 to reset card. Since we do not know
2144 * if the card is being re-initialized, just send it. CMD52
2145 * should be ignored by SD/eMMC cards.
2146 * Skip it if we already know that we do not support SDIO commands
2148 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2153 if (!(host->caps2 & MMC_CAP2_NO_SD))
2154 mmc_send_if_cond(host, host->ocr_avail);
2156 /* Order's important: probe SDIO, then SD, then MMC */
2157 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2158 if (!mmc_attach_sdio(host))
2161 if (!(host->caps2 & MMC_CAP2_NO_SD))
2162 if (!mmc_attach_sd(host))
2165 if (!(host->caps2 & MMC_CAP2_NO_MMC))
2166 if (!mmc_attach_mmc(host))
2169 mmc_power_off(host);
2173 int _mmc_detect_card_removed(struct mmc_host *host)
2177 if (!host->card || mmc_card_removed(host->card))
2180 ret = host->bus_ops->alive(host);
2183 * Card detect status and alive check may be out of sync if card is
2184 * removed slowly, when card detect switch changes while card/slot
2185 * pads are still contacted in hardware (refer to "SD Card Mechanical
2186 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2187 * detect work 200ms later for this case.
2189 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2190 mmc_detect_change(host, msecs_to_jiffies(200));
2191 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2195 mmc_card_set_removed(host->card);
2196 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2202 int mmc_detect_card_removed(struct mmc_host *host)
2204 struct mmc_card *card = host->card;
2207 WARN_ON(!host->claimed);
2212 if (!mmc_card_is_removable(host))
2215 ret = mmc_card_removed(card);
2217 * The card will be considered unchanged unless we have been asked to
2218 * detect a change or host requires polling to provide card detection.
2220 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2223 host->detect_change = 0;
2225 ret = _mmc_detect_card_removed(host);
2226 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2228 * Schedule a detect work as soon as possible to let a
2229 * rescan handle the card removal.
2231 cancel_delayed_work(&host->detect);
2232 _mmc_detect_change(host, 0, false);
2238 EXPORT_SYMBOL(mmc_detect_card_removed);
2240 void mmc_rescan(struct work_struct *work)
2242 struct mmc_host *host =
2243 container_of(work, struct mmc_host, detect.work);
2246 if (host->rescan_disable)
2249 /* If there is a non-removable card registered, only scan once */
2250 if (!mmc_card_is_removable(host) && host->rescan_entered)
2252 host->rescan_entered = 1;
2254 if (host->trigger_card_event && host->ops->card_event) {
2255 mmc_claim_host(host);
2256 host->ops->card_event(host);
2257 mmc_release_host(host);
2258 host->trigger_card_event = false;
2263 /* Verify a registered card to be functional, else remove it. */
2264 if (host->bus_ops && !host->bus_dead)
2265 host->bus_ops->detect(host);
2267 host->detect_change = 0;
2270 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2271 * the card is no longer present.
2276 /* if there still is a card present, stop here */
2277 if (host->bus_ops != NULL) {
2283 * Only we can add a new handler, so it's safe to
2284 * release the lock here.
2288 mmc_claim_host(host);
2289 if (mmc_card_is_removable(host) && host->ops->get_cd &&
2290 host->ops->get_cd(host) == 0) {
2291 mmc_power_off(host);
2292 mmc_release_host(host);
2296 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2297 unsigned int freq = freqs[i];
2298 if (freq > host->f_max) {
2299 if (i + 1 < ARRAY_SIZE(freqs))
2303 if (!mmc_rescan_try_freq(host, max(freq, host->f_min)))
2305 if (freqs[i] <= host->f_min)
2308 mmc_release_host(host);
2311 if (host->caps & MMC_CAP_NEEDS_POLL)
2312 mmc_schedule_delayed_work(&host->detect, HZ);
2315 void mmc_start_host(struct mmc_host *host)
2317 host->f_init = max(min(freqs[0], host->f_max), host->f_min);
2318 host->rescan_disable = 0;
2320 if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
2321 mmc_claim_host(host);
2322 mmc_power_up(host, host->ocr_avail);
2323 mmc_release_host(host);
2326 mmc_gpiod_request_cd_irq(host);
2327 _mmc_detect_change(host, 0, false);
2330 void __mmc_stop_host(struct mmc_host *host)
2332 if (host->slot.cd_irq >= 0) {
2333 mmc_gpio_set_cd_wake(host, false);
2334 disable_irq(host->slot.cd_irq);
2337 host->rescan_disable = 1;
2338 cancel_delayed_work_sync(&host->detect);
2341 void mmc_stop_host(struct mmc_host *host)
2343 __mmc_stop_host(host);
2345 /* clear pm flags now and let card drivers set them as needed */
2349 if (host->bus_ops && !host->bus_dead) {
2350 /* Calling bus_ops->remove() with a claimed host can deadlock */
2351 host->bus_ops->remove(host);
2352 mmc_claim_host(host);
2353 mmc_detach_bus(host);
2354 mmc_power_off(host);
2355 mmc_release_host(host);
2361 mmc_claim_host(host);
2362 mmc_power_off(host);
2363 mmc_release_host(host);
2366 static int __init mmc_init(void)
2370 ret = mmc_register_bus();
2374 ret = mmc_register_host_class();
2376 goto unregister_bus;
2378 ret = sdio_register_bus();
2380 goto unregister_host_class;
2384 unregister_host_class:
2385 mmc_unregister_host_class();
2387 mmc_unregister_bus();
2391 static void __exit mmc_exit(void)
2393 sdio_unregister_bus();
2394 mmc_unregister_host_class();
2395 mmc_unregister_bus();
2398 subsys_initcall(mmc_init);
2399 module_exit(mmc_exit);
2401 MODULE_LICENSE("GPL");