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>
52 /* If the device is not responding */
53 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
56 * Background operations can take a long time, depending on the housekeeping
57 * operations the card has to perform.
59 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
61 /* The max erase timeout, used when host->max_busy_timeout isn't specified */
62 #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
64 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
67 * Enabling software CRCs on the data blocks can be a significant (30%)
68 * performance cost, and for other reasons may not always be desired.
69 * So we allow it it to be disabled.
72 module_param(use_spi_crc, bool, 0);
74 static int mmc_schedule_delayed_work(struct delayed_work *work,
78 * We use the system_freezable_wq, because of two reasons.
79 * First, it allows several works (not the same work item) to be
80 * executed simultaneously. Second, the queue becomes frozen when
81 * userspace becomes frozen during system PM.
83 return queue_delayed_work(system_freezable_wq, work, delay);
86 #ifdef CONFIG_FAIL_MMC_REQUEST
89 * Internal function. Inject random data errors.
90 * If mmc_data is NULL no errors are injected.
92 static void mmc_should_fail_request(struct mmc_host *host,
93 struct mmc_request *mrq)
95 struct mmc_command *cmd = mrq->cmd;
96 struct mmc_data *data = mrq->data;
97 static const int data_errors[] = {
106 if (cmd->error || data->error ||
107 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
110 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
111 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
114 #else /* CONFIG_FAIL_MMC_REQUEST */
116 static inline void mmc_should_fail_request(struct mmc_host *host,
117 struct mmc_request *mrq)
121 #endif /* CONFIG_FAIL_MMC_REQUEST */
123 static inline void mmc_complete_cmd(struct mmc_request *mrq)
125 if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
126 complete_all(&mrq->cmd_completion);
129 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
131 if (!mrq->cap_cmd_during_tfr)
134 mmc_complete_cmd(mrq);
136 pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
137 mmc_hostname(host), mrq->cmd->opcode);
139 EXPORT_SYMBOL(mmc_command_done);
142 * mmc_request_done - finish processing an MMC request
143 * @host: MMC host which completed request
144 * @mrq: MMC request which request
146 * MMC drivers should call this function when they have completed
147 * their processing of a request.
149 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
151 struct mmc_command *cmd = mrq->cmd;
152 int err = cmd->error;
154 /* Flag re-tuning needed on CRC errors */
155 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
156 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
157 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
158 (mrq->data && mrq->data->error == -EILSEQ) ||
159 (mrq->stop && mrq->stop->error == -EILSEQ)))
160 mmc_retune_needed(host);
162 if (err && cmd->retries && mmc_host_is_spi(host)) {
163 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
167 if (host->ongoing_mrq == mrq)
168 host->ongoing_mrq = NULL;
170 mmc_complete_cmd(mrq);
172 trace_mmc_request_done(host, mrq);
174 if (err && cmd->retries && !mmc_card_removed(host->card)) {
176 * Request starter must handle retries - see
177 * mmc_wait_for_req_done().
182 mmc_should_fail_request(host, mrq);
184 if (!host->ongoing_mrq)
185 led_trigger_event(host->led, LED_OFF);
188 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
189 mmc_hostname(host), mrq->sbc->opcode,
191 mrq->sbc->resp[0], mrq->sbc->resp[1],
192 mrq->sbc->resp[2], mrq->sbc->resp[3]);
195 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
196 mmc_hostname(host), cmd->opcode, err,
197 cmd->resp[0], cmd->resp[1],
198 cmd->resp[2], cmd->resp[3]);
201 pr_debug("%s: %d bytes transferred: %d\n",
203 mrq->data->bytes_xfered, mrq->data->error);
207 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
208 mmc_hostname(host), mrq->stop->opcode,
210 mrq->stop->resp[0], mrq->stop->resp[1],
211 mrq->stop->resp[2], mrq->stop->resp[3]);
219 EXPORT_SYMBOL(mmc_request_done);
221 static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
225 /* Assumes host controller has been runtime resumed by mmc_claim_host */
226 err = mmc_retune(host);
228 mrq->cmd->error = err;
229 mmc_request_done(host, mrq);
234 * For sdio rw commands we must wait for card busy otherwise some
235 * sdio devices won't work properly.
237 if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
238 int tries = 500; /* Wait aprox 500ms at maximum */
240 while (host->ops->card_busy(host) && --tries)
244 mrq->cmd->error = -EBUSY;
245 mmc_request_done(host, mrq);
250 if (mrq->cap_cmd_during_tfr) {
251 host->ongoing_mrq = mrq;
253 * Retry path could come through here without having waiting on
254 * cmd_completion, so ensure it is reinitialised.
256 reinit_completion(&mrq->cmd_completion);
259 trace_mmc_request_start(host, mrq);
261 host->ops->request(host, mrq);
264 static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
266 #ifdef CONFIG_MMC_DEBUG
268 struct scatterlist *sg;
270 mmc_retune_hold(host);
272 if (mmc_card_removed(host->card))
276 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
277 mmc_hostname(host), mrq->sbc->opcode,
278 mrq->sbc->arg, mrq->sbc->flags);
281 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
282 mmc_hostname(host), mrq->cmd->opcode,
283 mrq->cmd->arg, mrq->cmd->flags);
286 pr_debug("%s: blksz %d blocks %d flags %08x "
287 "tsac %d ms nsac %d\n",
288 mmc_hostname(host), mrq->data->blksz,
289 mrq->data->blocks, mrq->data->flags,
290 mrq->data->timeout_ns / 1000000,
291 mrq->data->timeout_clks);
295 pr_debug("%s: CMD%u arg %08x flags %08x\n",
296 mmc_hostname(host), mrq->stop->opcode,
297 mrq->stop->arg, mrq->stop->flags);
300 WARN_ON(!host->claimed);
309 BUG_ON(mrq->data->blksz > host->max_blk_size);
310 BUG_ON(mrq->data->blocks > host->max_blk_count);
311 BUG_ON(mrq->data->blocks * mrq->data->blksz >
314 #ifdef CONFIG_MMC_DEBUG
316 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
318 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
321 mrq->cmd->data = mrq->data;
322 mrq->data->error = 0;
323 mrq->data->mrq = mrq;
325 mrq->data->stop = mrq->stop;
326 mrq->stop->error = 0;
327 mrq->stop->mrq = mrq;
330 led_trigger_event(host->led, LED_FULL);
331 __mmc_start_request(host, mrq);
337 * mmc_start_bkops - start BKOPS for supported cards
338 * @card: MMC card to start BKOPS
339 * @form_exception: A flag to indicate if this function was
340 * called due to an exception raised by the card
342 * Start background operations whenever requested.
343 * When the urgent BKOPS bit is set in a R1 command response
344 * then background operations should be started immediately.
346 void mmc_start_bkops(struct mmc_card *card, bool from_exception)
350 bool use_busy_signal;
354 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
357 err = mmc_read_bkops_status(card);
359 pr_err("%s: Failed to read bkops status: %d\n",
360 mmc_hostname(card->host), err);
364 if (!card->ext_csd.raw_bkops_status)
367 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
371 mmc_claim_host(card->host);
372 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
373 timeout = MMC_BKOPS_MAX_TIMEOUT;
374 use_busy_signal = true;
377 use_busy_signal = false;
380 mmc_retune_hold(card->host);
382 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
383 EXT_CSD_BKOPS_START, 1, timeout,
384 use_busy_signal, true, false);
386 pr_warn("%s: Error %d starting bkops\n",
387 mmc_hostname(card->host), err);
388 mmc_retune_release(card->host);
393 * For urgent bkops status (LEVEL_2 and more)
394 * bkops executed synchronously, otherwise
395 * the operation is in progress
397 if (!use_busy_signal)
398 mmc_card_set_doing_bkops(card);
400 mmc_retune_release(card->host);
402 mmc_release_host(card->host);
404 EXPORT_SYMBOL(mmc_start_bkops);
407 * mmc_wait_data_done() - done callback for data request
408 * @mrq: done data request
410 * Wakes up mmc context, passed as a callback to host controller driver
412 static void mmc_wait_data_done(struct mmc_request *mrq)
414 struct mmc_context_info *context_info = &mrq->host->context_info;
416 context_info->is_done_rcv = true;
417 wake_up_interruptible(&context_info->wait);
420 static void mmc_wait_done(struct mmc_request *mrq)
422 complete(&mrq->completion);
425 static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
427 struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
430 * If there is an ongoing transfer, wait for the command line to become
433 if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
434 wait_for_completion(&ongoing_mrq->cmd_completion);
438 *__mmc_start_data_req() - starts data request
439 * @host: MMC host to start the request
440 * @mrq: data request to start
442 * Sets the done callback to be called when request is completed by the card.
443 * Starts data mmc request execution
444 * If an ongoing transfer is already in progress, wait for the command line
445 * to become available before sending another command.
447 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
451 mmc_wait_ongoing_tfr_cmd(host);
453 mrq->done = mmc_wait_data_done;
456 init_completion(&mrq->cmd_completion);
458 err = mmc_start_request(host, mrq);
460 mrq->cmd->error = err;
461 mmc_complete_cmd(mrq);
462 mmc_wait_data_done(mrq);
468 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
472 mmc_wait_ongoing_tfr_cmd(host);
474 init_completion(&mrq->completion);
475 mrq->done = mmc_wait_done;
477 init_completion(&mrq->cmd_completion);
479 err = mmc_start_request(host, mrq);
481 mrq->cmd->error = err;
482 mmc_complete_cmd(mrq);
483 complete(&mrq->completion);
490 * mmc_wait_for_data_req_done() - wait for request completed
491 * @host: MMC host to prepare the command.
492 * @mrq: MMC request to wait for
494 * Blocks MMC context till host controller will ack end of data request
495 * execution or new request notification arrives from the block layer.
496 * Handles command retries.
498 * Returns enum mmc_blk_status after checking errors.
500 static int mmc_wait_for_data_req_done(struct mmc_host *host,
501 struct mmc_request *mrq,
502 struct mmc_async_req *next_req)
504 struct mmc_command *cmd;
505 struct mmc_context_info *context_info = &host->context_info;
510 wait_event_interruptible(context_info->wait,
511 (context_info->is_done_rcv ||
512 context_info->is_new_req));
513 spin_lock_irqsave(&context_info->lock, flags);
514 context_info->is_waiting_last_req = false;
515 spin_unlock_irqrestore(&context_info->lock, flags);
516 if (context_info->is_done_rcv) {
517 context_info->is_done_rcv = false;
518 context_info->is_new_req = false;
521 if (!cmd->error || !cmd->retries ||
522 mmc_card_removed(host->card)) {
523 err = host->areq->err_check(host->card,
525 break; /* return err */
527 mmc_retune_recheck(host);
528 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
530 cmd->opcode, cmd->error);
533 __mmc_start_request(host, mrq);
534 continue; /* wait for done/new event again */
536 } else if (context_info->is_new_req) {
537 context_info->is_new_req = false;
539 return MMC_BLK_NEW_REQUEST;
542 mmc_retune_release(host);
546 void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
548 struct mmc_command *cmd;
551 wait_for_completion(&mrq->completion);
556 * If host has timed out waiting for the sanitize
557 * to complete, card might be still in programming state
558 * so let's try to bring the card out of programming
561 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
562 if (!mmc_interrupt_hpi(host->card)) {
563 pr_warn("%s: %s: Interrupted sanitize\n",
564 mmc_hostname(host), __func__);
568 pr_err("%s: %s: Failed to interrupt sanitize\n",
569 mmc_hostname(host), __func__);
572 if (!cmd->error || !cmd->retries ||
573 mmc_card_removed(host->card))
576 mmc_retune_recheck(host);
578 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
579 mmc_hostname(host), cmd->opcode, cmd->error);
582 __mmc_start_request(host, mrq);
585 mmc_retune_release(host);
587 EXPORT_SYMBOL(mmc_wait_for_req_done);
590 * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
594 * mmc_is_req_done() is used with requests that have
595 * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
596 * starting a request and before waiting for it to complete. That is,
597 * either in between calls to mmc_start_req(), or after mmc_wait_for_req()
598 * and before mmc_wait_for_req_done(). If it is called at other times the
599 * result is not meaningful.
601 bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
604 return host->context_info.is_done_rcv;
606 return completion_done(&mrq->completion);
608 EXPORT_SYMBOL(mmc_is_req_done);
611 * mmc_pre_req - Prepare for a new request
612 * @host: MMC host to prepare command
613 * @mrq: MMC request to prepare for
614 * @is_first_req: true if there is no previous started request
615 * that may run in parellel to this call, otherwise false
617 * mmc_pre_req() is called in prior to mmc_start_req() to let
618 * host prepare for the new request. Preparation of a request may be
619 * performed while another request is running on the host.
621 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
624 if (host->ops->pre_req)
625 host->ops->pre_req(host, mrq, is_first_req);
629 * mmc_post_req - Post process a completed request
630 * @host: MMC host to post process command
631 * @mrq: MMC request to post process for
632 * @err: Error, if non zero, clean up any resources made in pre_req
634 * Let the host post process a completed request. Post processing of
635 * a request may be performed while another reuqest is running.
637 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
640 if (host->ops->post_req)
641 host->ops->post_req(host, mrq, err);
645 * mmc_start_req - start a non-blocking request
646 * @host: MMC host to start command
647 * @areq: async request to start
648 * @error: out parameter returns 0 for success, otherwise non zero
650 * Start a new MMC custom command request for a host.
651 * If there is on ongoing async request wait for completion
652 * of that request and start the new one and return.
653 * Does not wait for the new request to complete.
655 * Returns the completed request, NULL in case of none completed.
656 * Wait for the an ongoing request (previoulsy started) to complete and
657 * return the completed request. If there is no ongoing request, NULL
658 * is returned without waiting. NULL is not an error condition.
660 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
661 struct mmc_async_req *areq, int *error)
665 struct mmc_async_req *data = host->areq;
667 /* Prepare a new request */
669 mmc_pre_req(host, areq->mrq, !host->areq);
672 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
673 if (err == MMC_BLK_NEW_REQUEST) {
677 * The previous request was not completed,
683 * Check BKOPS urgency for each R1 response
685 if (host->card && mmc_card_mmc(host->card) &&
686 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
687 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
688 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
690 /* Cancel the prepared request */
692 mmc_post_req(host, areq->mrq, -EINVAL);
694 mmc_start_bkops(host->card, true);
696 /* prepare the request again */
698 mmc_pre_req(host, areq->mrq, !host->areq);
703 start_err = __mmc_start_data_req(host, areq->mrq);
706 mmc_post_req(host, host->areq->mrq, 0);
708 /* Cancel a prepared request if it was not started. */
709 if ((err || start_err) && areq)
710 mmc_post_req(host, areq->mrq, -EINVAL);
721 EXPORT_SYMBOL(mmc_start_req);
724 * mmc_wait_for_req - start a request and wait for completion
725 * @host: MMC host to start command
726 * @mrq: MMC request to start
728 * Start a new MMC custom command request for a host, and wait
729 * for the command to complete. In the case of 'cap_cmd_during_tfr'
730 * requests, the transfer is ongoing and the caller can issue further
731 * commands that do not use the data lines, and then wait by calling
732 * mmc_wait_for_req_done().
733 * Does not attempt to parse the response.
735 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
737 __mmc_start_req(host, mrq);
739 if (!mrq->cap_cmd_during_tfr)
740 mmc_wait_for_req_done(host, mrq);
742 EXPORT_SYMBOL(mmc_wait_for_req);
745 * mmc_interrupt_hpi - Issue for High priority Interrupt
746 * @card: the MMC card associated with the HPI transfer
748 * Issued High Priority Interrupt, and check for card status
749 * until out-of prg-state.
751 int mmc_interrupt_hpi(struct mmc_card *card)
755 unsigned long prg_wait;
759 if (!card->ext_csd.hpi_en) {
760 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
764 mmc_claim_host(card->host);
765 err = mmc_send_status(card, &status);
767 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
771 switch (R1_CURRENT_STATE(status)) {
777 * In idle and transfer states, HPI is not needed and the caller
778 * can issue the next intended command immediately
784 /* In all other states, it's illegal to issue HPI */
785 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
786 mmc_hostname(card->host), R1_CURRENT_STATE(status));
791 err = mmc_send_hpi_cmd(card, &status);
795 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
797 err = mmc_send_status(card, &status);
799 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
801 if (time_after(jiffies, prg_wait))
806 mmc_release_host(card->host);
809 EXPORT_SYMBOL(mmc_interrupt_hpi);
812 * mmc_wait_for_cmd - start a command and wait for completion
813 * @host: MMC host to start command
814 * @cmd: MMC command to start
815 * @retries: maximum number of retries
817 * Start a new MMC command for a host, and wait for the command
818 * to complete. Return any error that occurred while the command
819 * was executing. Do not attempt to parse the response.
821 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
823 struct mmc_request mrq = {NULL};
825 WARN_ON(!host->claimed);
827 memset(cmd->resp, 0, sizeof(cmd->resp));
828 cmd->retries = retries;
833 mmc_wait_for_req(host, &mrq);
838 EXPORT_SYMBOL(mmc_wait_for_cmd);
841 * mmc_stop_bkops - stop ongoing BKOPS
842 * @card: MMC card to check BKOPS
844 * Send HPI command to stop ongoing background operations to
845 * allow rapid servicing of foreground operations, e.g. read/
846 * writes. Wait until the card comes out of the programming state
847 * to avoid errors in servicing read/write requests.
849 int mmc_stop_bkops(struct mmc_card *card)
854 err = mmc_interrupt_hpi(card);
857 * If err is EINVAL, we can't issue an HPI.
858 * It should complete the BKOPS.
860 if (!err || (err == -EINVAL)) {
861 mmc_card_clr_doing_bkops(card);
862 mmc_retune_release(card->host);
868 EXPORT_SYMBOL(mmc_stop_bkops);
870 int mmc_read_bkops_status(struct mmc_card *card)
875 mmc_claim_host(card->host);
876 err = mmc_get_ext_csd(card, &ext_csd);
877 mmc_release_host(card->host);
881 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
882 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
886 EXPORT_SYMBOL(mmc_read_bkops_status);
889 * mmc_set_data_timeout - set the timeout for a data command
890 * @data: data phase for command
891 * @card: the MMC card associated with the data transfer
893 * Computes the data timeout parameters according to the
894 * correct algorithm given the card type.
896 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
901 * SDIO cards only define an upper 1 s limit on access.
903 if (mmc_card_sdio(card)) {
904 data->timeout_ns = 1000000000;
905 data->timeout_clks = 0;
910 * SD cards use a 100 multiplier rather than 10
912 mult = mmc_card_sd(card) ? 100 : 10;
915 * Scale up the multiplier (and therefore the timeout) by
916 * the r2w factor for writes.
918 if (data->flags & MMC_DATA_WRITE)
919 mult <<= card->csd.r2w_factor;
921 data->timeout_ns = card->csd.tacc_ns * mult;
922 data->timeout_clks = card->csd.tacc_clks * mult;
925 * SD cards also have an upper limit on the timeout.
927 if (mmc_card_sd(card)) {
928 unsigned int timeout_us, limit_us;
930 timeout_us = data->timeout_ns / 1000;
931 if (card->host->ios.clock)
932 timeout_us += data->timeout_clks * 1000 /
933 (card->host->ios.clock / 1000);
935 if (data->flags & MMC_DATA_WRITE)
937 * The MMC spec "It is strongly recommended
938 * for hosts to implement more than 500ms
939 * timeout value even if the card indicates
940 * the 250ms maximum busy length." Even the
941 * previous value of 300ms is known to be
942 * insufficient for some cards.
949 * SDHC cards always use these fixed values.
951 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
952 data->timeout_ns = limit_us * 1000;
953 data->timeout_clks = 0;
956 /* assign limit value if invalid */
958 data->timeout_ns = limit_us * 1000;
962 * Some cards require longer data read timeout than indicated in CSD.
963 * Address this by setting the read timeout to a "reasonably high"
964 * value. For the cards tested, 600ms has proven enough. If necessary,
965 * this value can be increased if other problematic cards require this.
967 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
968 data->timeout_ns = 600000000;
969 data->timeout_clks = 0;
973 * Some cards need very high timeouts if driven in SPI mode.
974 * The worst observed timeout was 900ms after writing a
975 * continuous stream of data until the internal logic
978 if (mmc_host_is_spi(card->host)) {
979 if (data->flags & MMC_DATA_WRITE) {
980 if (data->timeout_ns < 1000000000)
981 data->timeout_ns = 1000000000; /* 1s */
983 if (data->timeout_ns < 100000000)
984 data->timeout_ns = 100000000; /* 100ms */
988 EXPORT_SYMBOL(mmc_set_data_timeout);
991 * mmc_align_data_size - pads a transfer size to a more optimal value
992 * @card: the MMC card associated with the data transfer
993 * @sz: original transfer size
995 * Pads the original data size with a number of extra bytes in
996 * order to avoid controller bugs and/or performance hits
997 * (e.g. some controllers revert to PIO for certain sizes).
999 * Returns the improved size, which might be unmodified.
1001 * Note that this function is only relevant when issuing a
1002 * single scatter gather entry.
1004 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
1007 * FIXME: We don't have a system for the controller to tell
1008 * the core about its problems yet, so for now we just 32-bit
1011 sz = ((sz + 3) / 4) * 4;
1015 EXPORT_SYMBOL(mmc_align_data_size);
1018 * __mmc_claim_host - exclusively claim a host
1019 * @host: mmc host to claim
1020 * @abort: whether or not the operation should be aborted
1022 * Claim a host for a set of operations. If @abort is non null and
1023 * dereference a non-zero value then this will return prematurely with
1024 * that non-zero value without acquiring the lock. Returns zero
1025 * with the lock held otherwise.
1027 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
1029 DECLARE_WAITQUEUE(wait, current);
1030 unsigned long flags;
1036 add_wait_queue(&host->wq, &wait);
1037 spin_lock_irqsave(&host->lock, flags);
1039 set_current_state(TASK_UNINTERRUPTIBLE);
1040 stop = abort ? atomic_read(abort) : 0;
1041 if (stop || !host->claimed || host->claimer == current)
1043 spin_unlock_irqrestore(&host->lock, flags);
1045 spin_lock_irqsave(&host->lock, flags);
1047 set_current_state(TASK_RUNNING);
1050 host->claimer = current;
1051 host->claim_cnt += 1;
1052 if (host->claim_cnt == 1)
1056 spin_unlock_irqrestore(&host->lock, flags);
1057 remove_wait_queue(&host->wq, &wait);
1060 pm_runtime_get_sync(mmc_dev(host));
1064 EXPORT_SYMBOL(__mmc_claim_host);
1067 * mmc_release_host - release a host
1068 * @host: mmc host to release
1070 * Release a MMC host, allowing others to claim the host
1071 * for their operations.
1073 void mmc_release_host(struct mmc_host *host)
1075 unsigned long flags;
1077 WARN_ON(!host->claimed);
1079 spin_lock_irqsave(&host->lock, flags);
1080 if (--host->claim_cnt) {
1081 /* Release for nested claim */
1082 spin_unlock_irqrestore(&host->lock, flags);
1085 host->claimer = NULL;
1086 spin_unlock_irqrestore(&host->lock, flags);
1088 pm_runtime_mark_last_busy(mmc_dev(host));
1089 pm_runtime_put_autosuspend(mmc_dev(host));
1092 EXPORT_SYMBOL(mmc_release_host);
1095 * This is a helper function, which fetches a runtime pm reference for the
1096 * card device and also claims the host.
1098 void mmc_get_card(struct mmc_card *card)
1100 pm_runtime_get_sync(&card->dev);
1101 mmc_claim_host(card->host);
1103 EXPORT_SYMBOL(mmc_get_card);
1106 * This is a helper function, which releases the host and drops the runtime
1107 * pm reference for the card device.
1109 void mmc_put_card(struct mmc_card *card)
1111 mmc_release_host(card->host);
1112 pm_runtime_mark_last_busy(&card->dev);
1113 pm_runtime_put_autosuspend(&card->dev);
1115 EXPORT_SYMBOL(mmc_put_card);
1118 * Internal function that does the actual ios call to the host driver,
1119 * optionally printing some debug output.
1121 static inline void mmc_set_ios(struct mmc_host *host)
1123 struct mmc_ios *ios = &host->ios;
1125 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1126 "width %u timing %u\n",
1127 mmc_hostname(host), ios->clock, ios->bus_mode,
1128 ios->power_mode, ios->chip_select, ios->vdd,
1129 1 << ios->bus_width, ios->timing);
1131 host->ops->set_ios(host, ios);
1135 * Control chip select pin on a host.
1137 void mmc_set_chip_select(struct mmc_host *host, int mode)
1139 host->ios.chip_select = mode;
1144 * Sets the host clock to the highest possible frequency that
1147 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1149 WARN_ON(hz && hz < host->f_min);
1151 if (hz > host->f_max)
1154 host->ios.clock = hz;
1158 int mmc_execute_tuning(struct mmc_card *card)
1160 struct mmc_host *host = card->host;
1164 if (!host->ops->execute_tuning)
1167 if (mmc_card_mmc(card))
1168 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1170 opcode = MMC_SEND_TUNING_BLOCK;
1172 err = host->ops->execute_tuning(host, opcode);
1175 pr_err("%s: tuning execution failed: %d\n",
1176 mmc_hostname(host), err);
1178 host->retune_now = 0;
1179 host->need_retune = 0;
1180 mmc_retune_enable(host);
1187 * Change the bus mode (open drain/push-pull) of a host.
1189 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1191 host->ios.bus_mode = mode;
1196 * Change data bus width of a host.
1198 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1200 host->ios.bus_width = width;
1205 * Set initial state after a power cycle or a hw_reset.
1207 void mmc_set_initial_state(struct mmc_host *host)
1209 mmc_retune_disable(host);
1211 if (mmc_host_is_spi(host))
1212 host->ios.chip_select = MMC_CS_HIGH;
1214 host->ios.chip_select = MMC_CS_DONTCARE;
1215 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1216 host->ios.bus_width = MMC_BUS_WIDTH_1;
1217 host->ios.timing = MMC_TIMING_LEGACY;
1218 host->ios.drv_type = 0;
1219 host->ios.enhanced_strobe = false;
1222 * Make sure we are in non-enhanced strobe mode before we
1223 * actually enable it in ext_csd.
1225 if ((host->caps2 & MMC_CAP2_HS400_ES) &&
1226 host->ops->hs400_enhanced_strobe)
1227 host->ops->hs400_enhanced_strobe(host, &host->ios);
1233 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1234 * @vdd: voltage (mV)
1235 * @low_bits: prefer low bits in boundary cases
1237 * This function returns the OCR bit number according to the provided @vdd
1238 * value. If conversion is not possible a negative errno value returned.
1240 * Depending on the @low_bits flag the function prefers low or high OCR bits
1241 * on boundary voltages. For example,
1242 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1243 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1245 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1247 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1249 const int max_bit = ilog2(MMC_VDD_35_36);
1252 if (vdd < 1650 || vdd > 3600)
1255 if (vdd >= 1650 && vdd <= 1950)
1256 return ilog2(MMC_VDD_165_195);
1261 /* Base 2000 mV, step 100 mV, bit's base 8. */
1262 bit = (vdd - 2000) / 100 + 8;
1269 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1270 * @vdd_min: minimum voltage value (mV)
1271 * @vdd_max: maximum voltage value (mV)
1273 * This function returns the OCR mask bits according to the provided @vdd_min
1274 * and @vdd_max values. If conversion is not possible the function returns 0.
1276 * Notes wrt boundary cases:
1277 * This function sets the OCR bits for all boundary voltages, for example
1278 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1279 * MMC_VDD_34_35 mask.
1281 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1285 if (vdd_max < vdd_min)
1288 /* Prefer high bits for the boundary vdd_max values. */
1289 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1293 /* Prefer low bits for the boundary vdd_min values. */
1294 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1298 /* Fill the mask, from max bit to min bit. */
1299 while (vdd_max >= vdd_min)
1300 mask |= 1 << vdd_max--;
1304 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1309 * mmc_of_parse_voltage - return mask of supported voltages
1310 * @np: The device node need to be parsed.
1311 * @mask: mask of voltages available for MMC/SD/SDIO
1313 * Parse the "voltage-ranges" DT property, returning zero if it is not
1314 * found, negative errno if the voltage-range specification is invalid,
1315 * or one if the voltage-range is specified and successfully parsed.
1317 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1319 const u32 *voltage_ranges;
1322 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1323 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1324 if (!voltage_ranges) {
1325 pr_debug("%s: voltage-ranges unspecified\n", np->full_name);
1329 pr_err("%s: voltage-ranges empty\n", np->full_name);
1333 for (i = 0; i < num_ranges; i++) {
1334 const int j = i * 2;
1337 ocr_mask = mmc_vddrange_to_ocrmask(
1338 be32_to_cpu(voltage_ranges[j]),
1339 be32_to_cpu(voltage_ranges[j + 1]));
1341 pr_err("%s: voltage-range #%d is invalid\n",
1350 EXPORT_SYMBOL(mmc_of_parse_voltage);
1352 #endif /* CONFIG_OF */
1354 static int mmc_of_get_func_num(struct device_node *node)
1359 ret = of_property_read_u32(node, "reg", ®);
1366 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1369 struct device_node *node;
1371 if (!host->parent || !host->parent->of_node)
1374 for_each_child_of_node(host->parent->of_node, node) {
1375 if (mmc_of_get_func_num(node) == func_num)
1382 #ifdef CONFIG_REGULATOR
1385 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1386 * @vdd_bit: OCR bit number
1387 * @min_uV: minimum voltage value (mV)
1388 * @max_uV: maximum voltage value (mV)
1390 * This function returns the voltage range according to the provided OCR
1391 * bit number. If conversion is not possible a negative errno value returned.
1393 static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1401 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1402 * bits this regulator doesn't quite support ... don't
1403 * be too picky, most cards and regulators are OK with
1404 * a 0.1V range goof (it's a small error percentage).
1406 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1408 *min_uV = 1650 * 1000;
1409 *max_uV = 1950 * 1000;
1411 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1412 *max_uV = *min_uV + 100 * 1000;
1419 * mmc_regulator_get_ocrmask - return mask of supported voltages
1420 * @supply: regulator to use
1422 * This returns either a negative errno, or a mask of voltages that
1423 * can be provided to MMC/SD/SDIO devices using the specified voltage
1424 * regulator. This would normally be called before registering the
1427 int mmc_regulator_get_ocrmask(struct regulator *supply)
1435 count = regulator_count_voltages(supply);
1439 for (i = 0; i < count; i++) {
1440 vdd_uV = regulator_list_voltage(supply, i);
1444 vdd_mV = vdd_uV / 1000;
1445 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1449 vdd_uV = regulator_get_voltage(supply);
1453 vdd_mV = vdd_uV / 1000;
1454 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1459 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1462 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1463 * @mmc: the host to regulate
1464 * @supply: regulator to use
1465 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1467 * Returns zero on success, else negative errno.
1469 * MMC host drivers may use this to enable or disable a regulator using
1470 * a particular supply voltage. This would normally be called from the
1473 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1474 struct regulator *supply,
1475 unsigned short vdd_bit)
1481 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1483 result = regulator_set_voltage(supply, min_uV, max_uV);
1484 if (result == 0 && !mmc->regulator_enabled) {
1485 result = regulator_enable(supply);
1487 mmc->regulator_enabled = true;
1489 } else if (mmc->regulator_enabled) {
1490 result = regulator_disable(supply);
1492 mmc->regulator_enabled = false;
1496 dev_err(mmc_dev(mmc),
1497 "could not set regulator OCR (%d)\n", result);
1500 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1502 static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1503 int min_uV, int target_uV,
1507 * Check if supported first to avoid errors since we may try several
1508 * signal levels during power up and don't want to show errors.
1510 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1513 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1518 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1520 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1521 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1522 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1523 * SD card spec also define VQMMC in terms of VMMC.
1524 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1526 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1527 * requested voltage. This is definitely a good idea for UHS where there's a
1528 * separate regulator on the card that's trying to make 1.8V and it's best if
1531 * This function is expected to be used by a controller's
1532 * start_signal_voltage_switch() function.
1534 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1536 struct device *dev = mmc_dev(mmc);
1537 int ret, volt, min_uV, max_uV;
1539 /* If no vqmmc supply then we can't change the voltage */
1540 if (IS_ERR(mmc->supply.vqmmc))
1543 switch (ios->signal_voltage) {
1544 case MMC_SIGNAL_VOLTAGE_120:
1545 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1546 1100000, 1200000, 1300000);
1547 case MMC_SIGNAL_VOLTAGE_180:
1548 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1549 1700000, 1800000, 1950000);
1550 case MMC_SIGNAL_VOLTAGE_330:
1551 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1555 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1556 __func__, volt, max_uV);
1558 min_uV = max(volt - 300000, 2700000);
1559 max_uV = min(max_uV + 200000, 3600000);
1562 * Due to a limitation in the current implementation of
1563 * regulator_set_voltage_triplet() which is taking the lowest
1564 * voltage possible if below the target, search for a suitable
1565 * voltage in two steps and try to stay close to vmmc
1566 * with a 0.3V tolerance at first.
1568 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1569 min_uV, volt, max_uV))
1572 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1573 2700000, volt, 3600000);
1578 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1580 #endif /* CONFIG_REGULATOR */
1582 int mmc_regulator_get_supply(struct mmc_host *mmc)
1584 struct device *dev = mmc_dev(mmc);
1587 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1588 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1590 if (IS_ERR(mmc->supply.vmmc)) {
1591 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1592 return -EPROBE_DEFER;
1593 dev_dbg(dev, "No vmmc regulator found\n");
1595 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1597 mmc->ocr_avail = ret;
1599 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1602 if (IS_ERR(mmc->supply.vqmmc)) {
1603 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1604 return -EPROBE_DEFER;
1605 dev_dbg(dev, "No vqmmc regulator found\n");
1610 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1613 * Mask off any voltages we don't support and select
1614 * the lowest voltage
1616 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1621 * Sanity check the voltages that the card claims to
1625 dev_warn(mmc_dev(host),
1626 "card claims to support voltages below defined range\n");
1630 ocr &= host->ocr_avail;
1632 dev_warn(mmc_dev(host), "no support for card's volts\n");
1636 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1639 mmc_power_cycle(host, ocr);
1643 if (bit != host->ios.vdd)
1644 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1650 int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1653 int old_signal_voltage = host->ios.signal_voltage;
1655 host->ios.signal_voltage = signal_voltage;
1656 if (host->ops->start_signal_voltage_switch)
1657 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1660 host->ios.signal_voltage = old_signal_voltage;
1666 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1668 struct mmc_command cmd = {0};
1675 * Send CMD11 only if the request is to switch the card to
1678 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1679 return __mmc_set_signal_voltage(host, signal_voltage);
1682 * If we cannot switch voltages, return failure so the caller
1683 * can continue without UHS mode
1685 if (!host->ops->start_signal_voltage_switch)
1687 if (!host->ops->card_busy)
1688 pr_warn("%s: cannot verify signal voltage switch\n",
1689 mmc_hostname(host));
1691 cmd.opcode = SD_SWITCH_VOLTAGE;
1693 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1695 err = mmc_wait_for_cmd(host, &cmd, 0);
1699 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1703 * The card should drive cmd and dat[0:3] low immediately
1704 * after the response of cmd11, but wait 1 ms to be sure
1707 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1712 * During a signal voltage level switch, the clock must be gated
1713 * for 5 ms according to the SD spec
1715 clock = host->ios.clock;
1716 host->ios.clock = 0;
1719 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1721 * Voltages may not have been switched, but we've already
1722 * sent CMD11, so a power cycle is required anyway
1728 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1730 host->ios.clock = clock;
1733 /* Wait for at least 1 ms according to spec */
1737 * Failure to switch is indicated by the card holding
1740 if (host->ops->card_busy && host->ops->card_busy(host))
1745 pr_debug("%s: Signal voltage switch failed, "
1746 "power cycling card\n", mmc_hostname(host));
1747 mmc_power_cycle(host, ocr);
1754 * Select timing parameters for host.
1756 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1758 host->ios.timing = timing;
1763 * Select appropriate driver type for host.
1765 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1767 host->ios.drv_type = drv_type;
1771 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1772 int card_drv_type, int *drv_type)
1774 struct mmc_host *host = card->host;
1775 int host_drv_type = SD_DRIVER_TYPE_B;
1779 if (!host->ops->select_drive_strength)
1782 /* Use SD definition of driver strength for hosts */
1783 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1784 host_drv_type |= SD_DRIVER_TYPE_A;
1786 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1787 host_drv_type |= SD_DRIVER_TYPE_C;
1789 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1790 host_drv_type |= SD_DRIVER_TYPE_D;
1793 * The drive strength that the hardware can support
1794 * depends on the board design. Pass the appropriate
1795 * information and let the hardware specific code
1796 * return what is possible given the options
1798 return host->ops->select_drive_strength(card, max_dtr,
1805 * Apply power to the MMC stack. This is a two-stage process.
1806 * First, we enable power to the card without the clock running.
1807 * We then wait a bit for the power to stabilise. Finally,
1808 * enable the bus drivers and clock to the card.
1810 * We must _NOT_ enable the clock prior to power stablising.
1812 * If a host does all the power sequencing itself, ignore the
1813 * initial MMC_POWER_UP stage.
1815 void mmc_power_up(struct mmc_host *host, u32 ocr)
1817 if (host->ios.power_mode == MMC_POWER_ON)
1820 mmc_pwrseq_pre_power_on(host);
1822 host->ios.vdd = fls(ocr) - 1;
1823 host->ios.power_mode = MMC_POWER_UP;
1824 /* Set initial state and call mmc_set_ios */
1825 mmc_set_initial_state(host);
1827 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1828 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1829 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1830 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1831 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1832 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1833 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1836 * This delay should be sufficient to allow the power supply
1837 * to reach the minimum voltage.
1841 mmc_pwrseq_post_power_on(host);
1843 host->ios.clock = host->f_init;
1845 host->ios.power_mode = MMC_POWER_ON;
1849 * This delay must be at least 74 clock sizes, or 1 ms, or the
1850 * time required to reach a stable voltage.
1855 void mmc_power_off(struct mmc_host *host)
1857 if (host->ios.power_mode == MMC_POWER_OFF)
1860 mmc_pwrseq_power_off(host);
1862 host->ios.clock = 0;
1865 host->ios.power_mode = MMC_POWER_OFF;
1866 /* Set initial state and call mmc_set_ios */
1867 mmc_set_initial_state(host);
1870 * Some configurations, such as the 802.11 SDIO card in the OLPC
1871 * XO-1.5, require a short delay after poweroff before the card
1872 * can be successfully turned on again.
1877 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1879 mmc_power_off(host);
1880 /* Wait at least 1 ms according to SD spec */
1882 mmc_power_up(host, ocr);
1886 * Cleanup when the last reference to the bus operator is dropped.
1888 static void __mmc_release_bus(struct mmc_host *host)
1891 BUG_ON(host->bus_refs);
1892 BUG_ON(!host->bus_dead);
1894 host->bus_ops = NULL;
1898 * Increase reference count of bus operator
1900 static inline void mmc_bus_get(struct mmc_host *host)
1902 unsigned long flags;
1904 spin_lock_irqsave(&host->lock, flags);
1906 spin_unlock_irqrestore(&host->lock, flags);
1910 * Decrease reference count of bus operator and free it if
1911 * it is the last reference.
1913 static inline void mmc_bus_put(struct mmc_host *host)
1915 unsigned long flags;
1917 spin_lock_irqsave(&host->lock, flags);
1919 if ((host->bus_refs == 0) && host->bus_ops)
1920 __mmc_release_bus(host);
1921 spin_unlock_irqrestore(&host->lock, flags);
1925 * Assign a mmc bus handler to a host. Only one bus handler may control a
1926 * host at any given time.
1928 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1930 unsigned long flags;
1935 WARN_ON(!host->claimed);
1937 spin_lock_irqsave(&host->lock, flags);
1939 BUG_ON(host->bus_ops);
1940 BUG_ON(host->bus_refs);
1942 host->bus_ops = ops;
1946 spin_unlock_irqrestore(&host->lock, flags);
1950 * Remove the current bus handler from a host.
1952 void mmc_detach_bus(struct mmc_host *host)
1954 unsigned long flags;
1958 WARN_ON(!host->claimed);
1959 WARN_ON(!host->bus_ops);
1961 spin_lock_irqsave(&host->lock, flags);
1965 spin_unlock_irqrestore(&host->lock, flags);
1970 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1973 #ifdef CONFIG_MMC_DEBUG
1974 unsigned long flags;
1975 spin_lock_irqsave(&host->lock, flags);
1976 WARN_ON(host->removed);
1977 spin_unlock_irqrestore(&host->lock, flags);
1981 * If the device is configured as wakeup, we prevent a new sleep for
1982 * 5 s to give provision for user space to consume the event.
1984 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1985 device_can_wakeup(mmc_dev(host)))
1986 pm_wakeup_event(mmc_dev(host), 5000);
1988 host->detect_change = 1;
1989 mmc_schedule_delayed_work(&host->detect, delay);
1993 * mmc_detect_change - process change of state on a MMC socket
1994 * @host: host which changed state.
1995 * @delay: optional delay to wait before detection (jiffies)
1997 * MMC drivers should call this when they detect a card has been
1998 * inserted or removed. The MMC layer will confirm that any
1999 * present card is still functional, and initialize any newly
2002 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
2004 _mmc_detect_change(host, delay, true);
2006 EXPORT_SYMBOL(mmc_detect_change);
2008 void mmc_init_erase(struct mmc_card *card)
2012 if (is_power_of_2(card->erase_size))
2013 card->erase_shift = ffs(card->erase_size) - 1;
2015 card->erase_shift = 0;
2018 * It is possible to erase an arbitrarily large area of an SD or MMC
2019 * card. That is not desirable because it can take a long time
2020 * (minutes) potentially delaying more important I/O, and also the
2021 * timeout calculations become increasingly hugely over-estimated.
2022 * Consequently, 'pref_erase' is defined as a guide to limit erases
2023 * to that size and alignment.
2025 * For SD cards that define Allocation Unit size, limit erases to one
2026 * Allocation Unit at a time.
2027 * For MMC, have a stab at ai good value and for modern cards it will
2028 * end up being 4MiB. Note that if the value is too small, it can end
2029 * up taking longer to erase. Also note, erase_size is already set to
2030 * High Capacity Erase Size if available when this function is called.
2032 if (mmc_card_sd(card) && card->ssr.au) {
2033 card->pref_erase = card->ssr.au;
2034 card->erase_shift = ffs(card->ssr.au) - 1;
2035 } else if (card->erase_size) {
2036 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
2038 card->pref_erase = 512 * 1024 / 512;
2040 card->pref_erase = 1024 * 1024 / 512;
2042 card->pref_erase = 2 * 1024 * 1024 / 512;
2044 card->pref_erase = 4 * 1024 * 1024 / 512;
2045 if (card->pref_erase < card->erase_size)
2046 card->pref_erase = card->erase_size;
2048 sz = card->pref_erase % card->erase_size;
2050 card->pref_erase += card->erase_size - sz;
2053 card->pref_erase = 0;
2056 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
2057 unsigned int arg, unsigned int qty)
2059 unsigned int erase_timeout;
2061 if (arg == MMC_DISCARD_ARG ||
2062 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
2063 erase_timeout = card->ext_csd.trim_timeout;
2064 } else if (card->ext_csd.erase_group_def & 1) {
2065 /* High Capacity Erase Group Size uses HC timeouts */
2066 if (arg == MMC_TRIM_ARG)
2067 erase_timeout = card->ext_csd.trim_timeout;
2069 erase_timeout = card->ext_csd.hc_erase_timeout;
2071 /* CSD Erase Group Size uses write timeout */
2072 unsigned int mult = (10 << card->csd.r2w_factor);
2073 unsigned int timeout_clks = card->csd.tacc_clks * mult;
2074 unsigned int timeout_us;
2076 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
2077 if (card->csd.tacc_ns < 1000000)
2078 timeout_us = (card->csd.tacc_ns * mult) / 1000;
2080 timeout_us = (card->csd.tacc_ns / 1000) * mult;
2083 * ios.clock is only a target. The real clock rate might be
2084 * less but not that much less, so fudge it by multiplying by 2.
2087 timeout_us += (timeout_clks * 1000) /
2088 (card->host->ios.clock / 1000);
2090 erase_timeout = timeout_us / 1000;
2093 * Theoretically, the calculation could underflow so round up
2094 * to 1ms in that case.
2100 /* Multiplier for secure operations */
2101 if (arg & MMC_SECURE_ARGS) {
2102 if (arg == MMC_SECURE_ERASE_ARG)
2103 erase_timeout *= card->ext_csd.sec_erase_mult;
2105 erase_timeout *= card->ext_csd.sec_trim_mult;
2108 erase_timeout *= qty;
2111 * Ensure at least a 1 second timeout for SPI as per
2112 * 'mmc_set_data_timeout()'
2114 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2115 erase_timeout = 1000;
2117 return erase_timeout;
2120 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2124 unsigned int erase_timeout;
2126 if (card->ssr.erase_timeout) {
2127 /* Erase timeout specified in SD Status Register (SSR) */
2128 erase_timeout = card->ssr.erase_timeout * qty +
2129 card->ssr.erase_offset;
2132 * Erase timeout not specified in SD Status Register (SSR) so
2133 * use 250ms per write block.
2135 erase_timeout = 250 * qty;
2138 /* Must not be less than 1 second */
2139 if (erase_timeout < 1000)
2140 erase_timeout = 1000;
2142 return erase_timeout;
2145 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2149 if (mmc_card_sd(card))
2150 return mmc_sd_erase_timeout(card, arg, qty);
2152 return mmc_mmc_erase_timeout(card, arg, qty);
2155 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2156 unsigned int to, unsigned int arg)
2158 struct mmc_command cmd = {0};
2159 unsigned int qty = 0, busy_timeout = 0;
2160 bool use_r1b_resp = false;
2161 unsigned long timeout;
2164 mmc_retune_hold(card->host);
2167 * qty is used to calculate the erase timeout which depends on how many
2168 * erase groups (or allocation units in SD terminology) are affected.
2169 * We count erasing part of an erase group as one erase group.
2170 * For SD, the allocation units are always a power of 2. For MMC, the
2171 * erase group size is almost certainly also power of 2, but it does not
2172 * seem to insist on that in the JEDEC standard, so we fall back to
2173 * division in that case. SD may not specify an allocation unit size,
2174 * in which case the timeout is based on the number of write blocks.
2176 * Note that the timeout for secure trim 2 will only be correct if the
2177 * number of erase groups specified is the same as the total of all
2178 * preceding secure trim 1 commands. Since the power may have been
2179 * lost since the secure trim 1 commands occurred, it is generally
2180 * impossible to calculate the secure trim 2 timeout correctly.
2182 if (card->erase_shift)
2183 qty += ((to >> card->erase_shift) -
2184 (from >> card->erase_shift)) + 1;
2185 else if (mmc_card_sd(card))
2186 qty += to - from + 1;
2188 qty += ((to / card->erase_size) -
2189 (from / card->erase_size)) + 1;
2191 if (!mmc_card_blockaddr(card)) {
2196 if (mmc_card_sd(card))
2197 cmd.opcode = SD_ERASE_WR_BLK_START;
2199 cmd.opcode = MMC_ERASE_GROUP_START;
2201 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2202 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2204 pr_err("mmc_erase: group start error %d, "
2205 "status %#x\n", err, cmd.resp[0]);
2210 memset(&cmd, 0, sizeof(struct mmc_command));
2211 if (mmc_card_sd(card))
2212 cmd.opcode = SD_ERASE_WR_BLK_END;
2214 cmd.opcode = MMC_ERASE_GROUP_END;
2216 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2217 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2219 pr_err("mmc_erase: group end error %d, status %#x\n",
2225 memset(&cmd, 0, sizeof(struct mmc_command));
2226 cmd.opcode = MMC_ERASE;
2228 busy_timeout = mmc_erase_timeout(card, arg, qty);
2230 * If the host controller supports busy signalling and the timeout for
2231 * the erase operation does not exceed the max_busy_timeout, we should
2232 * use R1B response. Or we need to prevent the host from doing hw busy
2233 * detection, which is done by converting to a R1 response instead.
2235 if (card->host->max_busy_timeout &&
2236 busy_timeout > card->host->max_busy_timeout) {
2237 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2239 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2240 cmd.busy_timeout = busy_timeout;
2241 use_r1b_resp = true;
2244 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2246 pr_err("mmc_erase: erase error %d, status %#x\n",
2252 if (mmc_host_is_spi(card->host))
2256 * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
2259 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
2262 timeout = jiffies + msecs_to_jiffies(busy_timeout);
2264 memset(&cmd, 0, sizeof(struct mmc_command));
2265 cmd.opcode = MMC_SEND_STATUS;
2266 cmd.arg = card->rca << 16;
2267 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2268 /* Do not retry else we can't see errors */
2269 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2270 if (err || (cmd.resp[0] & 0xFDF92000)) {
2271 pr_err("error %d requesting status %#x\n",
2277 /* Timeout if the device never becomes ready for data and
2278 * never leaves the program state.
2280 if (time_after(jiffies, timeout)) {
2281 pr_err("%s: Card stuck in programming state! %s\n",
2282 mmc_hostname(card->host), __func__);
2287 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2288 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2290 mmc_retune_release(card->host);
2294 static unsigned int mmc_align_erase_size(struct mmc_card *card,
2299 unsigned int from_new = *from, nr_new = nr, rem;
2302 * When the 'card->erase_size' is power of 2, we can use round_up/down()
2303 * to align the erase size efficiently.
2305 if (is_power_of_2(card->erase_size)) {
2306 unsigned int temp = from_new;
2308 from_new = round_up(temp, card->erase_size);
2309 rem = from_new - temp;
2316 nr_new = round_down(nr_new, card->erase_size);
2318 rem = from_new % card->erase_size;
2320 rem = card->erase_size - rem;
2328 rem = nr_new % card->erase_size;
2336 *to = from_new + nr_new;
2343 * mmc_erase - erase sectors.
2344 * @card: card to erase
2345 * @from: first sector to erase
2346 * @nr: number of sectors to erase
2347 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2349 * Caller must claim host before calling this function.
2351 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2354 unsigned int rem, to = from + nr;
2357 if (!(card->host->caps & MMC_CAP_ERASE) ||
2358 !(card->csd.cmdclass & CCC_ERASE))
2361 if (!card->erase_size)
2364 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2367 if ((arg & MMC_SECURE_ARGS) &&
2368 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2371 if ((arg & MMC_TRIM_ARGS) &&
2372 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2375 if (arg == MMC_SECURE_ERASE_ARG) {
2376 if (from % card->erase_size || nr % card->erase_size)
2380 if (arg == MMC_ERASE_ARG)
2381 nr = mmc_align_erase_size(card, &from, &to, nr);
2389 /* 'from' and 'to' are inclusive */
2393 * Special case where only one erase-group fits in the timeout budget:
2394 * If the region crosses an erase-group boundary on this particular
2395 * case, we will be trimming more than one erase-group which, does not
2396 * fit in the timeout budget of the controller, so we need to split it
2397 * and call mmc_do_erase() twice if necessary. This special case is
2398 * identified by the card->eg_boundary flag.
2400 rem = card->erase_size - (from % card->erase_size);
2401 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2402 err = mmc_do_erase(card, from, from + rem - 1, arg);
2404 if ((err) || (to <= from))
2408 return mmc_do_erase(card, from, to, arg);
2410 EXPORT_SYMBOL(mmc_erase);
2412 int mmc_can_erase(struct mmc_card *card)
2414 if ((card->host->caps & MMC_CAP_ERASE) &&
2415 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2419 EXPORT_SYMBOL(mmc_can_erase);
2421 int mmc_can_trim(struct mmc_card *card)
2423 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2424 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2428 EXPORT_SYMBOL(mmc_can_trim);
2430 int mmc_can_discard(struct mmc_card *card)
2433 * As there's no way to detect the discard support bit at v4.5
2434 * use the s/w feature support filed.
2436 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2440 EXPORT_SYMBOL(mmc_can_discard);
2442 int mmc_can_sanitize(struct mmc_card *card)
2444 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2446 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2450 EXPORT_SYMBOL(mmc_can_sanitize);
2452 int mmc_can_secure_erase_trim(struct mmc_card *card)
2454 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2455 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2459 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2461 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2464 if (!card->erase_size)
2466 if (from % card->erase_size || nr % card->erase_size)
2470 EXPORT_SYMBOL(mmc_erase_group_aligned);
2472 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2475 struct mmc_host *host = card->host;
2476 unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
2477 unsigned int last_timeout = 0;
2478 unsigned int max_busy_timeout = host->max_busy_timeout ?
2479 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
2481 if (card->erase_shift) {
2482 max_qty = UINT_MAX >> card->erase_shift;
2483 min_qty = card->pref_erase >> card->erase_shift;
2484 } else if (mmc_card_sd(card)) {
2486 min_qty = card->pref_erase;
2488 max_qty = UINT_MAX / card->erase_size;
2489 min_qty = card->pref_erase / card->erase_size;
2493 * We should not only use 'host->max_busy_timeout' as the limitation
2494 * when deciding the max discard sectors. We should set a balance value
2495 * to improve the erase speed, and it can not get too long timeout at
2498 * Here we set 'card->pref_erase' as the minimal discard sectors no
2499 * matter what size of 'host->max_busy_timeout', but if the
2500 * 'host->max_busy_timeout' is large enough for more discard sectors,
2501 * then we can continue to increase the max discard sectors until we
2502 * get a balance value. In cases when the 'host->max_busy_timeout'
2503 * isn't specified, use the default max erase timeout.
2507 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2508 timeout = mmc_erase_timeout(card, arg, qty + x);
2510 if (qty + x > min_qty && timeout > max_busy_timeout)
2513 if (timeout < last_timeout)
2515 last_timeout = timeout;
2525 * When specifying a sector range to trim, chances are we might cross
2526 * an erase-group boundary even if the amount of sectors is less than
2528 * If we can only fit one erase-group in the controller timeout budget,
2529 * we have to care that erase-group boundaries are not crossed by a
2530 * single trim operation. We flag that special case with "eg_boundary".
2531 * In all other cases we can just decrement qty and pretend that we
2532 * always touch (qty + 1) erase-groups as a simple optimization.
2535 card->eg_boundary = 1;
2539 /* Convert qty to sectors */
2540 if (card->erase_shift)
2541 max_discard = qty << card->erase_shift;
2542 else if (mmc_card_sd(card))
2543 max_discard = qty + 1;
2545 max_discard = qty * card->erase_size;
2550 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2552 struct mmc_host *host = card->host;
2553 unsigned int max_discard, max_trim;
2556 * Without erase_group_def set, MMC erase timeout depends on clock
2557 * frequence which can change. In that case, the best choice is
2558 * just the preferred erase size.
2560 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2561 return card->pref_erase;
2563 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2564 if (mmc_can_trim(card)) {
2565 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2566 if (max_trim < max_discard)
2567 max_discard = max_trim;
2568 } else if (max_discard < card->erase_size) {
2571 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2572 mmc_hostname(host), max_discard, host->max_busy_timeout ?
2573 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
2576 EXPORT_SYMBOL(mmc_calc_max_discard);
2578 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2580 struct mmc_command cmd = {0};
2582 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
2583 mmc_card_hs400(card) || mmc_card_hs400es(card))
2586 cmd.opcode = MMC_SET_BLOCKLEN;
2588 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2589 return mmc_wait_for_cmd(card->host, &cmd, 5);
2591 EXPORT_SYMBOL(mmc_set_blocklen);
2593 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2596 struct mmc_command cmd = {0};
2598 cmd.opcode = MMC_SET_BLOCK_COUNT;
2599 cmd.arg = blockcount & 0x0000FFFF;
2602 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2603 return mmc_wait_for_cmd(card->host, &cmd, 5);
2605 EXPORT_SYMBOL(mmc_set_blockcount);
2607 static void mmc_hw_reset_for_init(struct mmc_host *host)
2609 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2611 host->ops->hw_reset(host);
2614 int mmc_hw_reset(struct mmc_host *host)
2622 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2627 ret = host->bus_ops->reset(host);
2631 pr_warn("%s: tried to reset card, got error %d\n",
2632 mmc_hostname(host), ret);
2636 EXPORT_SYMBOL(mmc_hw_reset);
2638 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2640 host->f_init = freq;
2642 #ifdef CONFIG_MMC_DEBUG
2643 pr_info("%s: %s: trying to init card at %u Hz\n",
2644 mmc_hostname(host), __func__, host->f_init);
2646 mmc_power_up(host, host->ocr_avail);
2649 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2650 * do a hardware reset if possible.
2652 mmc_hw_reset_for_init(host);
2655 * sdio_reset sends CMD52 to reset card. Since we do not know
2656 * if the card is being re-initialized, just send it. CMD52
2657 * should be ignored by SD/eMMC cards.
2658 * Skip it if we already know that we do not support SDIO commands
2660 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2665 if (!(host->caps2 & MMC_CAP2_NO_SD))
2666 mmc_send_if_cond(host, host->ocr_avail);
2668 /* Order's important: probe SDIO, then SD, then MMC */
2669 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2670 if (!mmc_attach_sdio(host))
2673 if (!(host->caps2 & MMC_CAP2_NO_SD))
2674 if (!mmc_attach_sd(host))
2677 if (!(host->caps2 & MMC_CAP2_NO_MMC))
2678 if (!mmc_attach_mmc(host))
2681 mmc_power_off(host);
2685 int _mmc_detect_card_removed(struct mmc_host *host)
2689 if (!host->card || mmc_card_removed(host->card))
2692 ret = host->bus_ops->alive(host);
2695 * Card detect status and alive check may be out of sync if card is
2696 * removed slowly, when card detect switch changes while card/slot
2697 * pads are still contacted in hardware (refer to "SD Card Mechanical
2698 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2699 * detect work 200ms later for this case.
2701 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2702 mmc_detect_change(host, msecs_to_jiffies(200));
2703 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2707 mmc_card_set_removed(host->card);
2708 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2714 int mmc_detect_card_removed(struct mmc_host *host)
2716 struct mmc_card *card = host->card;
2719 WARN_ON(!host->claimed);
2724 if (!mmc_card_is_removable(host))
2727 ret = mmc_card_removed(card);
2729 * The card will be considered unchanged unless we have been asked to
2730 * detect a change or host requires polling to provide card detection.
2732 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2735 host->detect_change = 0;
2737 ret = _mmc_detect_card_removed(host);
2738 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2740 * Schedule a detect work as soon as possible to let a
2741 * rescan handle the card removal.
2743 cancel_delayed_work(&host->detect);
2744 _mmc_detect_change(host, 0, false);
2750 EXPORT_SYMBOL(mmc_detect_card_removed);
2752 void mmc_rescan(struct work_struct *work)
2754 struct mmc_host *host =
2755 container_of(work, struct mmc_host, detect.work);
2758 if (host->rescan_disable)
2761 /* If there is a non-removable card registered, only scan once */
2762 if (!mmc_card_is_removable(host) && host->rescan_entered)
2764 host->rescan_entered = 1;
2766 if (host->trigger_card_event && host->ops->card_event) {
2767 mmc_claim_host(host);
2768 host->ops->card_event(host);
2769 mmc_release_host(host);
2770 host->trigger_card_event = false;
2776 * if there is a _removable_ card registered, check whether it is
2779 if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host))
2780 host->bus_ops->detect(host);
2782 host->detect_change = 0;
2785 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2786 * the card is no longer present.
2791 /* if there still is a card present, stop here */
2792 if (host->bus_ops != NULL) {
2798 * Only we can add a new handler, so it's safe to
2799 * release the lock here.
2803 mmc_claim_host(host);
2804 if (mmc_card_is_removable(host) && host->ops->get_cd &&
2805 host->ops->get_cd(host) == 0) {
2806 mmc_power_off(host);
2807 mmc_release_host(host);
2811 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2812 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2814 if (freqs[i] <= host->f_min)
2817 mmc_release_host(host);
2820 if (host->caps & MMC_CAP_NEEDS_POLL)
2821 mmc_schedule_delayed_work(&host->detect, HZ);
2824 void mmc_start_host(struct mmc_host *host)
2826 host->f_init = max(freqs[0], host->f_min);
2827 host->rescan_disable = 0;
2828 host->ios.power_mode = MMC_POWER_UNDEFINED;
2830 mmc_claim_host(host);
2831 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2832 mmc_power_off(host);
2834 mmc_power_up(host, host->ocr_avail);
2835 mmc_release_host(host);
2837 mmc_gpiod_request_cd_irq(host);
2838 _mmc_detect_change(host, 0, false);
2841 void mmc_stop_host(struct mmc_host *host)
2843 #ifdef CONFIG_MMC_DEBUG
2844 unsigned long flags;
2845 spin_lock_irqsave(&host->lock, flags);
2847 spin_unlock_irqrestore(&host->lock, flags);
2849 if (host->slot.cd_irq >= 0)
2850 disable_irq(host->slot.cd_irq);
2852 host->rescan_disable = 1;
2853 cancel_delayed_work_sync(&host->detect);
2855 /* clear pm flags now and let card drivers set them as needed */
2859 if (host->bus_ops && !host->bus_dead) {
2860 /* Calling bus_ops->remove() with a claimed host can deadlock */
2861 host->bus_ops->remove(host);
2862 mmc_claim_host(host);
2863 mmc_detach_bus(host);
2864 mmc_power_off(host);
2865 mmc_release_host(host);
2873 mmc_claim_host(host);
2874 mmc_power_off(host);
2875 mmc_release_host(host);
2878 int mmc_power_save_host(struct mmc_host *host)
2882 #ifdef CONFIG_MMC_DEBUG
2883 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2888 if (!host->bus_ops || host->bus_dead) {
2893 if (host->bus_ops->power_save)
2894 ret = host->bus_ops->power_save(host);
2898 mmc_power_off(host);
2902 EXPORT_SYMBOL(mmc_power_save_host);
2904 int mmc_power_restore_host(struct mmc_host *host)
2908 #ifdef CONFIG_MMC_DEBUG
2909 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2914 if (!host->bus_ops || host->bus_dead) {
2919 mmc_power_up(host, host->card->ocr);
2920 ret = host->bus_ops->power_restore(host);
2926 EXPORT_SYMBOL(mmc_power_restore_host);
2929 * Flush the cache to the non-volatile storage.
2931 int mmc_flush_cache(struct mmc_card *card)
2935 if (mmc_card_mmc(card) &&
2936 (card->ext_csd.cache_size > 0) &&
2937 (card->ext_csd.cache_ctrl & 1)) {
2938 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2939 EXT_CSD_FLUSH_CACHE, 1, 0);
2941 pr_err("%s: cache flush error %d\n",
2942 mmc_hostname(card->host), err);
2947 EXPORT_SYMBOL(mmc_flush_cache);
2949 #ifdef CONFIG_PM_SLEEP
2950 /* Do the card removal on suspend if card is assumed removeable
2951 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2954 static int mmc_pm_notify(struct notifier_block *notify_block,
2955 unsigned long mode, void *unused)
2957 struct mmc_host *host = container_of(
2958 notify_block, struct mmc_host, pm_notify);
2959 unsigned long flags;
2963 case PM_HIBERNATION_PREPARE:
2964 case PM_SUSPEND_PREPARE:
2965 case PM_RESTORE_PREPARE:
2966 spin_lock_irqsave(&host->lock, flags);
2967 host->rescan_disable = 1;
2968 spin_unlock_irqrestore(&host->lock, flags);
2969 cancel_delayed_work_sync(&host->detect);
2974 /* Validate prerequisites for suspend */
2975 if (host->bus_ops->pre_suspend)
2976 err = host->bus_ops->pre_suspend(host);
2980 if (!mmc_card_is_removable(host)) {
2981 dev_warn(mmc_dev(host),
2982 "pre_suspend failed for non-removable host: "
2984 /* Avoid removing non-removable hosts */
2988 /* Calling bus_ops->remove() with a claimed host can deadlock */
2989 host->bus_ops->remove(host);
2990 mmc_claim_host(host);
2991 mmc_detach_bus(host);
2992 mmc_power_off(host);
2993 mmc_release_host(host);
2997 case PM_POST_SUSPEND:
2998 case PM_POST_HIBERNATION:
2999 case PM_POST_RESTORE:
3001 spin_lock_irqsave(&host->lock, flags);
3002 host->rescan_disable = 0;
3003 spin_unlock_irqrestore(&host->lock, flags);
3004 _mmc_detect_change(host, 0, false);
3011 void mmc_register_pm_notifier(struct mmc_host *host)
3013 host->pm_notify.notifier_call = mmc_pm_notify;
3014 register_pm_notifier(&host->pm_notify);
3017 void mmc_unregister_pm_notifier(struct mmc_host *host)
3019 unregister_pm_notifier(&host->pm_notify);
3024 * mmc_init_context_info() - init synchronization context
3027 * Init struct context_info needed to implement asynchronous
3028 * request mechanism, used by mmc core, host driver and mmc requests
3031 void mmc_init_context_info(struct mmc_host *host)
3033 spin_lock_init(&host->context_info.lock);
3034 host->context_info.is_new_req = false;
3035 host->context_info.is_done_rcv = false;
3036 host->context_info.is_waiting_last_req = false;
3037 init_waitqueue_head(&host->context_info.wait);
3040 static int __init mmc_init(void)
3044 ret = mmc_register_bus();
3048 ret = mmc_register_host_class();
3050 goto unregister_bus;
3052 ret = sdio_register_bus();
3054 goto unregister_host_class;
3058 unregister_host_class:
3059 mmc_unregister_host_class();
3061 mmc_unregister_bus();
3065 static void __exit mmc_exit(void)
3067 sdio_unregister_bus();
3068 mmc_unregister_host_class();
3069 mmc_unregister_bus();
3072 subsys_initcall(mmc_init);
3073 module_exit(mmc_exit);
3075 MODULE_LICENSE("GPL");