2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/pm_wakeup.h>
27 #include <linux/suspend.h>
28 #include <linux/fault-inject.h>
29 #include <linux/random.h>
30 #include <linux/slab.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/mmc.h>
36 #include <linux/mmc/sd.h>
37 #include <linux/mmc/slot-gpio.h>
39 #define CREATE_TRACE_POINTS
40 #include <trace/events/mmc.h>
53 /* If the device is not responding */
54 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
56 /* The max erase timeout, used when host->max_busy_timeout isn't specified */
57 #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
59 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
62 * Enabling software CRCs on the data blocks can be a significant (30%)
63 * performance cost, and for other reasons may not always be desired.
64 * So we allow it it to be disabled.
67 module_param(use_spi_crc, bool, 0);
69 static int mmc_schedule_delayed_work(struct delayed_work *work,
73 * We use the system_freezable_wq, because of two reasons.
74 * First, it allows several works (not the same work item) to be
75 * executed simultaneously. Second, the queue becomes frozen when
76 * userspace becomes frozen during system PM.
78 return queue_delayed_work(system_freezable_wq, work, delay);
81 #ifdef CONFIG_FAIL_MMC_REQUEST
84 * Internal function. Inject random data errors.
85 * If mmc_data is NULL no errors are injected.
87 static void mmc_should_fail_request(struct mmc_host *host,
88 struct mmc_request *mrq)
90 struct mmc_command *cmd = mrq->cmd;
91 struct mmc_data *data = mrq->data;
92 static const int data_errors[] = {
101 if (cmd->error || data->error ||
102 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
105 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
106 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
109 #else /* CONFIG_FAIL_MMC_REQUEST */
111 static inline void mmc_should_fail_request(struct mmc_host *host,
112 struct mmc_request *mrq)
116 #endif /* CONFIG_FAIL_MMC_REQUEST */
118 static inline void mmc_complete_cmd(struct mmc_request *mrq)
120 if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
121 complete_all(&mrq->cmd_completion);
124 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
126 if (!mrq->cap_cmd_during_tfr)
129 mmc_complete_cmd(mrq);
131 pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
132 mmc_hostname(host), mrq->cmd->opcode);
134 EXPORT_SYMBOL(mmc_command_done);
137 * mmc_request_done - finish processing an MMC request
138 * @host: MMC host which completed request
139 * @mrq: MMC request which request
141 * MMC drivers should call this function when they have completed
142 * their processing of a request.
144 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
146 struct mmc_command *cmd = mrq->cmd;
147 int err = cmd->error;
149 /* Flag re-tuning needed on CRC errors */
150 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
151 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
152 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
153 (mrq->data && mrq->data->error == -EILSEQ) ||
154 (mrq->stop && mrq->stop->error == -EILSEQ)))
155 mmc_retune_needed(host);
157 if (err && cmd->retries && mmc_host_is_spi(host)) {
158 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
162 if (host->ongoing_mrq == mrq)
163 host->ongoing_mrq = NULL;
165 mmc_complete_cmd(mrq);
167 trace_mmc_request_done(host, mrq);
170 * We list various conditions for the command to be considered
173 * - There was no error, OK fine then
174 * - We are not doing some kind of retry
175 * - The card was removed (...so just complete everything no matter
176 * if there are errors or retries)
178 if (!err || !cmd->retries || mmc_card_removed(host->card)) {
179 mmc_should_fail_request(host, mrq);
181 if (!host->ongoing_mrq)
182 led_trigger_event(host->led, LED_OFF);
185 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
186 mmc_hostname(host), mrq->sbc->opcode,
188 mrq->sbc->resp[0], mrq->sbc->resp[1],
189 mrq->sbc->resp[2], mrq->sbc->resp[3]);
192 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
193 mmc_hostname(host), cmd->opcode, err,
194 cmd->resp[0], cmd->resp[1],
195 cmd->resp[2], cmd->resp[3]);
198 pr_debug("%s: %d bytes transferred: %d\n",
200 mrq->data->bytes_xfered, mrq->data->error);
204 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
205 mmc_hostname(host), mrq->stop->opcode,
207 mrq->stop->resp[0], mrq->stop->resp[1],
208 mrq->stop->resp[2], mrq->stop->resp[3]);
212 * Request starter must handle retries - see
213 * mmc_wait_for_req_done().
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.
236 * And bypass I/O abort, reset and bus suspend operations.
238 if (sdio_is_io_busy(mrq->cmd->opcode, mrq->cmd->arg) &&
239 host->ops->card_busy) {
240 int tries = 500; /* Wait aprox 500ms at maximum */
242 while (host->ops->card_busy(host) && --tries)
246 mrq->cmd->error = -EBUSY;
247 mmc_request_done(host, mrq);
252 if (mrq->cap_cmd_during_tfr) {
253 host->ongoing_mrq = mrq;
255 * Retry path could come through here without having waiting on
256 * cmd_completion, so ensure it is reinitialised.
258 reinit_completion(&mrq->cmd_completion);
261 trace_mmc_request_start(host, mrq);
264 host->cqe_ops->cqe_off(host);
266 host->ops->request(host, mrq);
269 static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq,
273 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
274 mmc_hostname(host), mrq->sbc->opcode,
275 mrq->sbc->arg, mrq->sbc->flags);
279 pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n",
280 mmc_hostname(host), cqe ? "CQE direct " : "",
281 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
283 pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n",
284 mmc_hostname(host), mrq->tag, mrq->data->blk_addr);
288 pr_debug("%s: blksz %d blocks %d flags %08x "
289 "tsac %d ms nsac %d\n",
290 mmc_hostname(host), mrq->data->blksz,
291 mrq->data->blocks, mrq->data->flags,
292 mrq->data->timeout_ns / 1000000,
293 mrq->data->timeout_clks);
297 pr_debug("%s: CMD%u arg %08x flags %08x\n",
298 mmc_hostname(host), mrq->stop->opcode,
299 mrq->stop->arg, mrq->stop->flags);
303 static int mmc_mrq_prep(struct mmc_host *host, struct mmc_request *mrq)
305 unsigned int i, sz = 0;
306 struct scatterlist *sg;
311 mrq->cmd->data = mrq->data;
318 if (mrq->data->blksz > host->max_blk_size ||
319 mrq->data->blocks > host->max_blk_count ||
320 mrq->data->blocks * mrq->data->blksz > host->max_req_size)
323 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
325 if (sz != mrq->data->blocks * mrq->data->blksz)
328 mrq->data->error = 0;
329 mrq->data->mrq = mrq;
331 mrq->data->stop = mrq->stop;
332 mrq->stop->error = 0;
333 mrq->stop->mrq = mrq;
340 int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
344 mmc_retune_hold(host);
346 if (mmc_card_removed(host->card))
349 mmc_mrq_pr_debug(host, mrq, false);
351 WARN_ON(!host->claimed);
353 err = mmc_mrq_prep(host, mrq);
357 led_trigger_event(host->led, LED_FULL);
358 __mmc_start_request(host, mrq);
362 EXPORT_SYMBOL(mmc_start_request);
365 * mmc_wait_data_done() - done callback for data request
366 * @mrq: done data request
368 * Wakes up mmc context, passed as a callback to host controller driver
370 static void mmc_wait_data_done(struct mmc_request *mrq)
372 struct mmc_context_info *context_info = &mrq->host->context_info;
374 context_info->is_done_rcv = true;
375 wake_up_interruptible(&context_info->wait);
378 static void mmc_wait_done(struct mmc_request *mrq)
380 complete(&mrq->completion);
383 static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
385 struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
388 * If there is an ongoing transfer, wait for the command line to become
391 if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
392 wait_for_completion(&ongoing_mrq->cmd_completion);
396 *__mmc_start_data_req() - starts data request
397 * @host: MMC host to start the request
398 * @mrq: data request to start
400 * Sets the done callback to be called when request is completed by the card.
401 * Starts data mmc request execution
402 * If an ongoing transfer is already in progress, wait for the command line
403 * to become available before sending another command.
405 static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
409 mmc_wait_ongoing_tfr_cmd(host);
411 mrq->done = mmc_wait_data_done;
414 init_completion(&mrq->cmd_completion);
416 err = mmc_start_request(host, mrq);
418 mrq->cmd->error = err;
419 mmc_complete_cmd(mrq);
420 mmc_wait_data_done(mrq);
426 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
430 mmc_wait_ongoing_tfr_cmd(host);
432 init_completion(&mrq->completion);
433 mrq->done = mmc_wait_done;
435 init_completion(&mrq->cmd_completion);
437 err = mmc_start_request(host, mrq);
439 mrq->cmd->error = err;
440 mmc_complete_cmd(mrq);
441 complete(&mrq->completion);
447 void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
449 struct mmc_command *cmd;
452 wait_for_completion(&mrq->completion);
457 * If host has timed out waiting for the sanitize
458 * to complete, card might be still in programming state
459 * so let's try to bring the card out of programming
462 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
463 if (!mmc_interrupt_hpi(host->card)) {
464 pr_warn("%s: %s: Interrupted sanitize\n",
465 mmc_hostname(host), __func__);
469 pr_err("%s: %s: Failed to interrupt sanitize\n",
470 mmc_hostname(host), __func__);
473 if (!cmd->error || !cmd->retries ||
474 mmc_card_removed(host->card))
477 mmc_retune_recheck(host);
479 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
480 mmc_hostname(host), cmd->opcode, cmd->error);
483 __mmc_start_request(host, mrq);
486 mmc_retune_release(host);
488 EXPORT_SYMBOL(mmc_wait_for_req_done);
491 * mmc_cqe_start_req - Start a CQE request.
492 * @host: MMC host to start the request
493 * @mrq: request to start
495 * Start the request, re-tuning if needed and it is possible. Returns an error
496 * code if the request fails to start or -EBUSY if CQE is busy.
498 int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
503 * CQE cannot process re-tuning commands. Caller must hold retuning
504 * while CQE is in use. Re-tuning can happen here only when CQE has no
505 * active requests i.e. this is the first. Note, re-tuning will call
508 err = mmc_retune(host);
514 mmc_mrq_pr_debug(host, mrq, true);
516 err = mmc_mrq_prep(host, mrq);
520 err = host->cqe_ops->cqe_request(host, mrq);
524 trace_mmc_request_start(host, mrq);
530 pr_debug("%s: failed to start CQE direct CMD%u, error %d\n",
531 mmc_hostname(host), mrq->cmd->opcode, err);
533 pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n",
534 mmc_hostname(host), mrq->tag, err);
538 EXPORT_SYMBOL(mmc_cqe_start_req);
541 * mmc_cqe_request_done - CQE has finished processing an MMC request
542 * @host: MMC host which completed request
543 * @mrq: MMC request which completed
545 * CQE drivers should call this function when they have completed
546 * their processing of a request.
548 void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
550 mmc_should_fail_request(host, mrq);
552 /* Flag re-tuning needed on CRC errors */
553 if ((mrq->cmd && mrq->cmd->error == -EILSEQ) ||
554 (mrq->data && mrq->data->error == -EILSEQ))
555 mmc_retune_needed(host);
557 trace_mmc_request_done(host, mrq);
560 pr_debug("%s: CQE req done (direct CMD%u): %d\n",
561 mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error);
563 pr_debug("%s: CQE transfer done tag %d\n",
564 mmc_hostname(host), mrq->tag);
568 pr_debug("%s: %d bytes transferred: %d\n",
570 mrq->data->bytes_xfered, mrq->data->error);
575 EXPORT_SYMBOL(mmc_cqe_request_done);
578 * mmc_cqe_post_req - CQE post process of a completed MMC request
580 * @mrq: MMC request to be processed
582 void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq)
584 if (host->cqe_ops->cqe_post_req)
585 host->cqe_ops->cqe_post_req(host, mrq);
587 EXPORT_SYMBOL(mmc_cqe_post_req);
589 /* Arbitrary 1 second timeout */
590 #define MMC_CQE_RECOVERY_TIMEOUT 1000
593 * mmc_cqe_recovery - Recover from CQE errors.
594 * @host: MMC host to recover
596 * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in
597 * in eMMC, and discarding the queue in CQE. CQE must call
598 * mmc_cqe_request_done() on all requests. An error is returned if the eMMC
599 * fails to discard its queue.
601 int mmc_cqe_recovery(struct mmc_host *host)
603 struct mmc_command cmd;
606 mmc_retune_hold_now(host);
609 * Recovery is expected seldom, if at all, but it reduces performance,
610 * so make sure it is not completely silent.
612 pr_warn("%s: running CQE recovery\n", mmc_hostname(host));
614 host->cqe_ops->cqe_recovery_start(host);
616 memset(&cmd, 0, sizeof(cmd));
617 cmd.opcode = MMC_STOP_TRANSMISSION,
618 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC,
619 cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
620 cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
621 mmc_wait_for_cmd(host, &cmd, 0);
623 memset(&cmd, 0, sizeof(cmd));
624 cmd.opcode = MMC_CMDQ_TASK_MGMT;
625 cmd.arg = 1; /* Discard entire queue */
626 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
627 cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
628 cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
629 err = mmc_wait_for_cmd(host, &cmd, 0);
631 host->cqe_ops->cqe_recovery_finish(host);
633 mmc_retune_release(host);
637 EXPORT_SYMBOL(mmc_cqe_recovery);
640 * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
644 * mmc_is_req_done() is used with requests that have
645 * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
646 * starting a request and before waiting for it to complete. That is,
647 * either in between calls to mmc_start_req(), or after mmc_wait_for_req()
648 * and before mmc_wait_for_req_done(). If it is called at other times the
649 * result is not meaningful.
651 bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
654 return host->context_info.is_done_rcv;
656 return completion_done(&mrq->completion);
658 EXPORT_SYMBOL(mmc_is_req_done);
661 * mmc_pre_req - Prepare for a new request
662 * @host: MMC host to prepare command
663 * @mrq: MMC request to prepare for
665 * mmc_pre_req() is called in prior to mmc_start_req() to let
666 * host prepare for the new request. Preparation of a request may be
667 * performed while another request is running on the host.
669 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq)
671 if (host->ops->pre_req)
672 host->ops->pre_req(host, mrq);
676 * mmc_post_req - Post process a completed request
677 * @host: MMC host to post process command
678 * @mrq: MMC request to post process for
679 * @err: Error, if non zero, clean up any resources made in pre_req
681 * Let the host post process a completed request. Post processing of
682 * a request may be performed while another reuqest is running.
684 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
687 if (host->ops->post_req)
688 host->ops->post_req(host, mrq, err);
692 * mmc_finalize_areq() - finalize an asynchronous request
693 * @host: MMC host to finalize any ongoing request on
695 * Returns the status of the ongoing asynchronous request, but
696 * MMC_BLK_SUCCESS if no request was going on.
698 static enum mmc_blk_status mmc_finalize_areq(struct mmc_host *host)
700 struct mmc_context_info *context_info = &host->context_info;
701 enum mmc_blk_status status;
704 return MMC_BLK_SUCCESS;
707 wait_event_interruptible(context_info->wait,
708 (context_info->is_done_rcv ||
709 context_info->is_new_req));
711 if (context_info->is_done_rcv) {
712 struct mmc_command *cmd;
714 context_info->is_done_rcv = false;
715 cmd = host->areq->mrq->cmd;
717 if (!cmd->error || !cmd->retries ||
718 mmc_card_removed(host->card)) {
719 status = host->areq->err_check(host->card,
721 break; /* return status */
723 mmc_retune_recheck(host);
724 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
726 cmd->opcode, cmd->error);
729 __mmc_start_request(host, host->areq->mrq);
730 continue; /* wait for done/new event again */
734 return MMC_BLK_NEW_REQUEST;
737 mmc_retune_release(host);
740 * Check BKOPS urgency for each R1 response
742 if (host->card && mmc_card_mmc(host->card) &&
743 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
744 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
745 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
746 mmc_start_bkops(host->card, true);
753 * mmc_start_areq - start an asynchronous request
754 * @host: MMC host to start command
755 * @areq: asynchronous request to start
756 * @ret_stat: out parameter for status
758 * Start a new MMC custom command request for a host.
759 * If there is on ongoing async request wait for completion
760 * of that request and start the new one and return.
761 * Does not wait for the new request to complete.
763 * Returns the completed request, NULL in case of none completed.
764 * Wait for the an ongoing request (previoulsy started) to complete and
765 * return the completed request. If there is no ongoing request, NULL
766 * is returned without waiting. NULL is not an error condition.
768 struct mmc_async_req *mmc_start_areq(struct mmc_host *host,
769 struct mmc_async_req *areq,
770 enum mmc_blk_status *ret_stat)
772 enum mmc_blk_status status;
774 struct mmc_async_req *previous = host->areq;
776 /* Prepare a new request */
778 mmc_pre_req(host, areq->mrq);
780 /* Finalize previous request */
781 status = mmc_finalize_areq(host);
785 /* The previous request is still going on... */
786 if (status == MMC_BLK_NEW_REQUEST)
789 /* Fine so far, start the new request! */
790 if (status == MMC_BLK_SUCCESS && areq)
791 start_err = __mmc_start_data_req(host, areq->mrq);
793 /* Postprocess the old request at this point */
795 mmc_post_req(host, host->areq->mrq, 0);
797 /* Cancel a prepared request if it was not started. */
798 if ((status != MMC_BLK_SUCCESS || start_err) && areq)
799 mmc_post_req(host, areq->mrq, -EINVAL);
801 if (status != MMC_BLK_SUCCESS)
808 EXPORT_SYMBOL(mmc_start_areq);
811 * mmc_wait_for_req - start a request and wait for completion
812 * @host: MMC host to start command
813 * @mrq: MMC request to start
815 * Start a new MMC custom command request for a host, and wait
816 * for the command to complete. In the case of 'cap_cmd_during_tfr'
817 * requests, the transfer is ongoing and the caller can issue further
818 * commands that do not use the data lines, and then wait by calling
819 * mmc_wait_for_req_done().
820 * Does not attempt to parse the response.
822 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
824 __mmc_start_req(host, mrq);
826 if (!mrq->cap_cmd_during_tfr)
827 mmc_wait_for_req_done(host, mrq);
829 EXPORT_SYMBOL(mmc_wait_for_req);
832 * mmc_wait_for_cmd - start a command and wait for completion
833 * @host: MMC host to start command
834 * @cmd: MMC command to start
835 * @retries: maximum number of retries
837 * Start a new MMC command for a host, and wait for the command
838 * to complete. Return any error that occurred while the command
839 * was executing. Do not attempt to parse the response.
841 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
843 struct mmc_request mrq = {};
845 WARN_ON(!host->claimed);
847 memset(cmd->resp, 0, sizeof(cmd->resp));
848 cmd->retries = retries;
853 mmc_wait_for_req(host, &mrq);
858 EXPORT_SYMBOL(mmc_wait_for_cmd);
861 * mmc_set_data_timeout - set the timeout for a data command
862 * @data: data phase for command
863 * @card: the MMC card associated with the data transfer
865 * Computes the data timeout parameters according to the
866 * correct algorithm given the card type.
868 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
873 * SDIO cards only define an upper 1 s limit on access.
875 if (mmc_card_sdio(card)) {
876 data->timeout_ns = 1000000000;
877 data->timeout_clks = 0;
882 * SD cards use a 100 multiplier rather than 10
884 mult = mmc_card_sd(card) ? 100 : 10;
887 * Scale up the multiplier (and therefore the timeout) by
888 * the r2w factor for writes.
890 if (data->flags & MMC_DATA_WRITE)
891 mult <<= card->csd.r2w_factor;
893 data->timeout_ns = card->csd.taac_ns * mult;
894 data->timeout_clks = card->csd.taac_clks * mult;
897 * SD cards also have an upper limit on the timeout.
899 if (mmc_card_sd(card)) {
900 unsigned int timeout_us, limit_us;
902 timeout_us = data->timeout_ns / 1000;
903 if (card->host->ios.clock)
904 timeout_us += data->timeout_clks * 1000 /
905 (card->host->ios.clock / 1000);
907 if (data->flags & MMC_DATA_WRITE)
909 * The MMC spec "It is strongly recommended
910 * for hosts to implement more than 500ms
911 * timeout value even if the card indicates
912 * the 250ms maximum busy length." Even the
913 * previous value of 300ms is known to be
914 * insufficient for some cards.
921 * SDHC cards always use these fixed values.
923 if (timeout_us > limit_us) {
924 data->timeout_ns = limit_us * 1000;
925 data->timeout_clks = 0;
928 /* assign limit value if invalid */
930 data->timeout_ns = limit_us * 1000;
934 * Some cards require longer data read timeout than indicated in CSD.
935 * Address this by setting the read timeout to a "reasonably high"
936 * value. For the cards tested, 600ms has proven enough. If necessary,
937 * this value can be increased if other problematic cards require this.
939 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
940 data->timeout_ns = 600000000;
941 data->timeout_clks = 0;
945 * Some cards need very high timeouts if driven in SPI mode.
946 * The worst observed timeout was 900ms after writing a
947 * continuous stream of data until the internal logic
950 if (mmc_host_is_spi(card->host)) {
951 if (data->flags & MMC_DATA_WRITE) {
952 if (data->timeout_ns < 1000000000)
953 data->timeout_ns = 1000000000; /* 1s */
955 if (data->timeout_ns < 100000000)
956 data->timeout_ns = 100000000; /* 100ms */
960 EXPORT_SYMBOL(mmc_set_data_timeout);
963 * mmc_align_data_size - pads a transfer size to a more optimal value
964 * @card: the MMC card associated with the data transfer
965 * @sz: original transfer size
967 * Pads the original data size with a number of extra bytes in
968 * order to avoid controller bugs and/or performance hits
969 * (e.g. some controllers revert to PIO for certain sizes).
971 * Returns the improved size, which might be unmodified.
973 * Note that this function is only relevant when issuing a
974 * single scatter gather entry.
976 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
979 * FIXME: We don't have a system for the controller to tell
980 * the core about its problems yet, so for now we just 32-bit
983 sz = ((sz + 3) / 4) * 4;
987 EXPORT_SYMBOL(mmc_align_data_size);
990 * Allow claiming an already claimed host if the context is the same or there is
991 * no context but the task is the same.
993 static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
994 struct task_struct *task)
996 return host->claimer == ctx ||
997 (!ctx && task && host->claimer->task == task);
1000 static inline void mmc_ctx_set_claimer(struct mmc_host *host,
1001 struct mmc_ctx *ctx,
1002 struct task_struct *task)
1004 if (!host->claimer) {
1006 host->claimer = ctx;
1008 host->claimer = &host->default_ctx;
1011 host->claimer->task = task;
1015 * __mmc_claim_host - exclusively claim a host
1016 * @host: mmc host to claim
1017 * @ctx: context that claims the host or NULL in which case the default
1018 * context will be used
1019 * @abort: whether or not the operation should be aborted
1021 * Claim a host for a set of operations. If @abort is non null and
1022 * dereference a non-zero value then this will return prematurely with
1023 * that non-zero value without acquiring the lock. Returns zero
1024 * with the lock held otherwise.
1026 int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
1029 struct task_struct *task = ctx ? NULL : current;
1030 DECLARE_WAITQUEUE(wait, current);
1031 unsigned long flags;
1037 add_wait_queue(&host->wq, &wait);
1038 spin_lock_irqsave(&host->lock, flags);
1040 set_current_state(TASK_UNINTERRUPTIBLE);
1041 stop = abort ? atomic_read(abort) : 0;
1042 if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
1044 spin_unlock_irqrestore(&host->lock, flags);
1046 spin_lock_irqsave(&host->lock, flags);
1048 set_current_state(TASK_RUNNING);
1051 mmc_ctx_set_claimer(host, ctx, task);
1052 host->claim_cnt += 1;
1053 if (host->claim_cnt == 1)
1057 spin_unlock_irqrestore(&host->lock, flags);
1058 remove_wait_queue(&host->wq, &wait);
1061 pm_runtime_get_sync(mmc_dev(host));
1065 EXPORT_SYMBOL(__mmc_claim_host);
1068 * mmc_release_host - release a host
1069 * @host: mmc host to release
1071 * Release a MMC host, allowing others to claim the host
1072 * for their operations.
1074 void mmc_release_host(struct mmc_host *host)
1076 unsigned long flags;
1078 WARN_ON(!host->claimed);
1080 spin_lock_irqsave(&host->lock, flags);
1081 if (--host->claim_cnt) {
1082 /* Release for nested claim */
1083 spin_unlock_irqrestore(&host->lock, flags);
1086 host->claimer->task = NULL;
1087 host->claimer = NULL;
1088 spin_unlock_irqrestore(&host->lock, flags);
1090 pm_runtime_mark_last_busy(mmc_dev(host));
1091 pm_runtime_put_autosuspend(mmc_dev(host));
1094 EXPORT_SYMBOL(mmc_release_host);
1097 * This is a helper function, which fetches a runtime pm reference for the
1098 * card device and also claims the host.
1100 void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
1102 pm_runtime_get_sync(&card->dev);
1103 __mmc_claim_host(card->host, ctx, NULL);
1105 EXPORT_SYMBOL(mmc_get_card);
1108 * This is a helper function, which releases the host and drops the runtime
1109 * pm reference for the card device.
1111 void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
1113 struct mmc_host *host = card->host;
1115 WARN_ON(ctx && host->claimer != ctx);
1117 mmc_release_host(host);
1118 pm_runtime_mark_last_busy(&card->dev);
1119 pm_runtime_put_autosuspend(&card->dev);
1121 EXPORT_SYMBOL(mmc_put_card);
1124 * Internal function that does the actual ios call to the host driver,
1125 * optionally printing some debug output.
1127 static inline void mmc_set_ios(struct mmc_host *host)
1129 struct mmc_ios *ios = &host->ios;
1131 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1132 "width %u timing %u\n",
1133 mmc_hostname(host), ios->clock, ios->bus_mode,
1134 ios->power_mode, ios->chip_select, ios->vdd,
1135 1 << ios->bus_width, ios->timing);
1137 host->ops->set_ios(host, ios);
1141 * Control chip select pin on a host.
1143 void mmc_set_chip_select(struct mmc_host *host, int mode)
1145 host->ios.chip_select = mode;
1150 * Sets the host clock to the highest possible frequency that
1153 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1155 WARN_ON(hz && hz < host->f_min);
1157 if (hz > host->f_max)
1160 host->ios.clock = hz;
1164 int mmc_execute_tuning(struct mmc_card *card)
1166 struct mmc_host *host = card->host;
1170 if (!host->ops->execute_tuning)
1174 host->cqe_ops->cqe_off(host);
1176 if (mmc_card_mmc(card))
1177 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1179 opcode = MMC_SEND_TUNING_BLOCK;
1181 err = host->ops->execute_tuning(host, opcode);
1184 pr_err("%s: tuning execution failed: %d\n",
1185 mmc_hostname(host), err);
1187 mmc_retune_enable(host);
1193 * Change the bus mode (open drain/push-pull) of a host.
1195 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1197 host->ios.bus_mode = mode;
1202 * Change data bus width of a host.
1204 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1206 host->ios.bus_width = width;
1211 * Set initial state after a power cycle or a hw_reset.
1213 void mmc_set_initial_state(struct mmc_host *host)
1216 host->cqe_ops->cqe_off(host);
1218 mmc_retune_disable(host);
1220 if (mmc_host_is_spi(host))
1221 host->ios.chip_select = MMC_CS_HIGH;
1223 host->ios.chip_select = MMC_CS_DONTCARE;
1224 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1225 host->ios.bus_width = MMC_BUS_WIDTH_1;
1226 host->ios.timing = MMC_TIMING_LEGACY;
1227 host->ios.drv_type = 0;
1228 host->ios.enhanced_strobe = false;
1231 * Make sure we are in non-enhanced strobe mode before we
1232 * actually enable it in ext_csd.
1234 if ((host->caps2 & MMC_CAP2_HS400_ES) &&
1235 host->ops->hs400_enhanced_strobe)
1236 host->ops->hs400_enhanced_strobe(host, &host->ios);
1242 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1243 * @vdd: voltage (mV)
1244 * @low_bits: prefer low bits in boundary cases
1246 * This function returns the OCR bit number according to the provided @vdd
1247 * value. If conversion is not possible a negative errno value returned.
1249 * Depending on the @low_bits flag the function prefers low or high OCR bits
1250 * on boundary voltages. For example,
1251 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1252 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1254 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1256 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1258 const int max_bit = ilog2(MMC_VDD_35_36);
1261 if (vdd < 1650 || vdd > 3600)
1264 if (vdd >= 1650 && vdd <= 1950)
1265 return ilog2(MMC_VDD_165_195);
1270 /* Base 2000 mV, step 100 mV, bit's base 8. */
1271 bit = (vdd - 2000) / 100 + 8;
1278 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1279 * @vdd_min: minimum voltage value (mV)
1280 * @vdd_max: maximum voltage value (mV)
1282 * This function returns the OCR mask bits according to the provided @vdd_min
1283 * and @vdd_max values. If conversion is not possible the function returns 0.
1285 * Notes wrt boundary cases:
1286 * This function sets the OCR bits for all boundary voltages, for example
1287 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1288 * MMC_VDD_34_35 mask.
1290 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1294 if (vdd_max < vdd_min)
1297 /* Prefer high bits for the boundary vdd_max values. */
1298 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1302 /* Prefer low bits for the boundary vdd_min values. */
1303 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1307 /* Fill the mask, from max bit to min bit. */
1308 while (vdd_max >= vdd_min)
1309 mask |= 1 << vdd_max--;
1313 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1318 * mmc_of_parse_voltage - return mask of supported voltages
1319 * @np: The device node need to be parsed.
1320 * @mask: mask of voltages available for MMC/SD/SDIO
1322 * Parse the "voltage-ranges" DT property, returning zero if it is not
1323 * found, negative errno if the voltage-range specification is invalid,
1324 * or one if the voltage-range is specified and successfully parsed.
1326 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1328 const u32 *voltage_ranges;
1331 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1332 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1333 if (!voltage_ranges) {
1334 pr_debug("%pOF: voltage-ranges unspecified\n", np);
1338 pr_err("%pOF: voltage-ranges empty\n", np);
1342 for (i = 0; i < num_ranges; i++) {
1343 const int j = i * 2;
1346 ocr_mask = mmc_vddrange_to_ocrmask(
1347 be32_to_cpu(voltage_ranges[j]),
1348 be32_to_cpu(voltage_ranges[j + 1]));
1350 pr_err("%pOF: voltage-range #%d is invalid\n",
1359 EXPORT_SYMBOL(mmc_of_parse_voltage);
1361 #endif /* CONFIG_OF */
1363 static int mmc_of_get_func_num(struct device_node *node)
1368 ret = of_property_read_u32(node, "reg", ®);
1375 struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1378 struct device_node *node;
1380 if (!host->parent || !host->parent->of_node)
1383 for_each_child_of_node(host->parent->of_node, node) {
1384 if (mmc_of_get_func_num(node) == func_num)
1391 #ifdef CONFIG_REGULATOR
1394 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1395 * @vdd_bit: OCR bit number
1396 * @min_uV: minimum voltage value (mV)
1397 * @max_uV: maximum voltage value (mV)
1399 * This function returns the voltage range according to the provided OCR
1400 * bit number. If conversion is not possible a negative errno value returned.
1402 static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1410 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1411 * bits this regulator doesn't quite support ... don't
1412 * be too picky, most cards and regulators are OK with
1413 * a 0.1V range goof (it's a small error percentage).
1415 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1417 *min_uV = 1650 * 1000;
1418 *max_uV = 1950 * 1000;
1420 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1421 *max_uV = *min_uV + 100 * 1000;
1428 * mmc_regulator_get_ocrmask - return mask of supported voltages
1429 * @supply: regulator to use
1431 * This returns either a negative errno, or a mask of voltages that
1432 * can be provided to MMC/SD/SDIO devices using the specified voltage
1433 * regulator. This would normally be called before registering the
1436 int mmc_regulator_get_ocrmask(struct regulator *supply)
1444 count = regulator_count_voltages(supply);
1448 for (i = 0; i < count; i++) {
1449 vdd_uV = regulator_list_voltage(supply, i);
1453 vdd_mV = vdd_uV / 1000;
1454 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1458 vdd_uV = regulator_get_voltage(supply);
1462 vdd_mV = vdd_uV / 1000;
1463 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1468 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1471 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1472 * @mmc: the host to regulate
1473 * @supply: regulator to use
1474 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1476 * Returns zero on success, else negative errno.
1478 * MMC host drivers may use this to enable or disable a regulator using
1479 * a particular supply voltage. This would normally be called from the
1482 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1483 struct regulator *supply,
1484 unsigned short vdd_bit)
1490 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1492 result = regulator_set_voltage(supply, min_uV, max_uV);
1493 if (result == 0 && !mmc->regulator_enabled) {
1494 result = regulator_enable(supply);
1496 mmc->regulator_enabled = true;
1498 } else if (mmc->regulator_enabled) {
1499 result = regulator_disable(supply);
1501 mmc->regulator_enabled = false;
1505 dev_err(mmc_dev(mmc),
1506 "could not set regulator OCR (%d)\n", result);
1509 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1511 static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1512 int min_uV, int target_uV,
1516 * Check if supported first to avoid errors since we may try several
1517 * signal levels during power up and don't want to show errors.
1519 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1522 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1527 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1529 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1530 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1531 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1532 * SD card spec also define VQMMC in terms of VMMC.
1533 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1535 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1536 * requested voltage. This is definitely a good idea for UHS where there's a
1537 * separate regulator on the card that's trying to make 1.8V and it's best if
1540 * This function is expected to be used by a controller's
1541 * start_signal_voltage_switch() function.
1543 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1545 struct device *dev = mmc_dev(mmc);
1546 int ret, volt, min_uV, max_uV;
1548 /* If no vqmmc supply then we can't change the voltage */
1549 if (IS_ERR(mmc->supply.vqmmc))
1552 switch (ios->signal_voltage) {
1553 case MMC_SIGNAL_VOLTAGE_120:
1554 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1555 1100000, 1200000, 1300000);
1556 case MMC_SIGNAL_VOLTAGE_180:
1557 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1558 1700000, 1800000, 1950000);
1559 case MMC_SIGNAL_VOLTAGE_330:
1560 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1564 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1565 __func__, volt, max_uV);
1567 min_uV = max(volt - 300000, 2700000);
1568 max_uV = min(max_uV + 200000, 3600000);
1571 * Due to a limitation in the current implementation of
1572 * regulator_set_voltage_triplet() which is taking the lowest
1573 * voltage possible if below the target, search for a suitable
1574 * voltage in two steps and try to stay close to vmmc
1575 * with a 0.3V tolerance at first.
1577 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1578 min_uV, volt, max_uV))
1581 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1582 2700000, volt, 3600000);
1587 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1589 #endif /* CONFIG_REGULATOR */
1591 int mmc_regulator_get_supply(struct mmc_host *mmc)
1593 struct device *dev = mmc_dev(mmc);
1596 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1597 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1599 if (IS_ERR(mmc->supply.vmmc)) {
1600 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1601 return -EPROBE_DEFER;
1602 dev_dbg(dev, "No vmmc regulator found\n");
1604 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1606 mmc->ocr_avail = ret;
1608 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1611 if (IS_ERR(mmc->supply.vqmmc)) {
1612 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1613 return -EPROBE_DEFER;
1614 dev_dbg(dev, "No vqmmc regulator found\n");
1619 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1622 * Mask off any voltages we don't support and select
1623 * the lowest voltage
1625 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1630 * Sanity check the voltages that the card claims to
1634 dev_warn(mmc_dev(host),
1635 "card claims to support voltages below defined range\n");
1639 ocr &= host->ocr_avail;
1641 dev_warn(mmc_dev(host), "no support for card's volts\n");
1645 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1648 mmc_power_cycle(host, ocr);
1652 if (bit != host->ios.vdd)
1653 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1659 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1662 int old_signal_voltage = host->ios.signal_voltage;
1664 host->ios.signal_voltage = signal_voltage;
1665 if (host->ops->start_signal_voltage_switch)
1666 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1669 host->ios.signal_voltage = old_signal_voltage;
1675 int mmc_host_set_uhs_voltage(struct mmc_host *host)
1680 * During a signal voltage level switch, the clock must be gated
1681 * for 5 ms according to the SD spec
1683 clock = host->ios.clock;
1684 host->ios.clock = 0;
1687 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1690 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1692 host->ios.clock = clock;
1698 int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
1700 struct mmc_command cmd = {};
1704 * If we cannot switch voltages, return failure so the caller
1705 * can continue without UHS mode
1707 if (!host->ops->start_signal_voltage_switch)
1709 if (!host->ops->card_busy)
1710 pr_warn("%s: cannot verify signal voltage switch\n",
1711 mmc_hostname(host));
1713 cmd.opcode = SD_SWITCH_VOLTAGE;
1715 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1717 err = mmc_wait_for_cmd(host, &cmd, 0);
1721 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1725 * The card should drive cmd and dat[0:3] low immediately
1726 * after the response of cmd11, but wait 1 ms to be sure
1729 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1734 if (mmc_host_set_uhs_voltage(host)) {
1736 * Voltages may not have been switched, but we've already
1737 * sent CMD11, so a power cycle is required anyway
1743 /* Wait for at least 1 ms according to spec */
1747 * Failure to switch is indicated by the card holding
1750 if (host->ops->card_busy && host->ops->card_busy(host))
1755 pr_debug("%s: Signal voltage switch failed, "
1756 "power cycling card\n", mmc_hostname(host));
1757 mmc_power_cycle(host, ocr);
1764 * Select timing parameters for host.
1766 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1768 host->ios.timing = timing;
1773 * Select appropriate driver type for host.
1775 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1777 host->ios.drv_type = drv_type;
1781 int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1782 int card_drv_type, int *drv_type)
1784 struct mmc_host *host = card->host;
1785 int host_drv_type = SD_DRIVER_TYPE_B;
1789 if (!host->ops->select_drive_strength)
1792 /* Use SD definition of driver strength for hosts */
1793 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1794 host_drv_type |= SD_DRIVER_TYPE_A;
1796 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1797 host_drv_type |= SD_DRIVER_TYPE_C;
1799 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1800 host_drv_type |= SD_DRIVER_TYPE_D;
1803 * The drive strength that the hardware can support
1804 * depends on the board design. Pass the appropriate
1805 * information and let the hardware specific code
1806 * return what is possible given the options
1808 return host->ops->select_drive_strength(card, max_dtr,
1815 * Apply power to the MMC stack. This is a two-stage process.
1816 * First, we enable power to the card without the clock running.
1817 * We then wait a bit for the power to stabilise. Finally,
1818 * enable the bus drivers and clock to the card.
1820 * We must _NOT_ enable the clock prior to power stablising.
1822 * If a host does all the power sequencing itself, ignore the
1823 * initial MMC_POWER_UP stage.
1825 void mmc_power_up(struct mmc_host *host, u32 ocr)
1827 if (host->ios.power_mode == MMC_POWER_ON)
1830 mmc_pwrseq_pre_power_on(host);
1832 host->ios.vdd = fls(ocr) - 1;
1833 host->ios.power_mode = MMC_POWER_UP;
1834 /* Set initial state and call mmc_set_ios */
1835 mmc_set_initial_state(host);
1837 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1838 if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330))
1839 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1840 else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1841 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1842 else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120))
1843 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1846 * This delay should be sufficient to allow the power supply
1847 * to reach the minimum voltage.
1851 mmc_pwrseq_post_power_on(host);
1853 host->ios.clock = host->f_init;
1855 host->ios.power_mode = MMC_POWER_ON;
1859 * This delay must be at least 74 clock sizes, or 1 ms, or the
1860 * time required to reach a stable voltage.
1865 void mmc_power_off(struct mmc_host *host)
1867 if (host->ios.power_mode == MMC_POWER_OFF)
1870 mmc_pwrseq_power_off(host);
1872 host->ios.clock = 0;
1875 host->ios.power_mode = MMC_POWER_OFF;
1876 /* Set initial state and call mmc_set_ios */
1877 mmc_set_initial_state(host);
1880 * Some configurations, such as the 802.11 SDIO card in the OLPC
1881 * XO-1.5, require a short delay after poweroff before the card
1882 * can be successfully turned on again.
1887 void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1889 mmc_power_off(host);
1890 /* Wait at least 1 ms according to SD spec */
1892 mmc_power_up(host, ocr);
1896 * Cleanup when the last reference to the bus operator is dropped.
1898 static void __mmc_release_bus(struct mmc_host *host)
1900 WARN_ON(!host->bus_dead);
1902 host->bus_ops = NULL;
1906 * Increase reference count of bus operator
1908 static inline void mmc_bus_get(struct mmc_host *host)
1910 unsigned long flags;
1912 spin_lock_irqsave(&host->lock, flags);
1914 spin_unlock_irqrestore(&host->lock, flags);
1918 * Decrease reference count of bus operator and free it if
1919 * it is the last reference.
1921 static inline void mmc_bus_put(struct mmc_host *host)
1923 unsigned long flags;
1925 spin_lock_irqsave(&host->lock, flags);
1927 if ((host->bus_refs == 0) && host->bus_ops)
1928 __mmc_release_bus(host);
1929 spin_unlock_irqrestore(&host->lock, flags);
1933 * Assign a mmc bus handler to a host. Only one bus handler may control a
1934 * host at any given time.
1936 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1938 unsigned long flags;
1940 WARN_ON(!host->claimed);
1942 spin_lock_irqsave(&host->lock, flags);
1944 WARN_ON(host->bus_ops);
1945 WARN_ON(host->bus_refs);
1947 host->bus_ops = ops;
1951 spin_unlock_irqrestore(&host->lock, flags);
1955 * Remove the current bus handler from a host.
1957 void mmc_detach_bus(struct mmc_host *host)
1959 unsigned long flags;
1961 WARN_ON(!host->claimed);
1962 WARN_ON(!host->bus_ops);
1964 spin_lock_irqsave(&host->lock, flags);
1968 spin_unlock_irqrestore(&host->lock, flags);
1973 static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1977 * If the device is configured as wakeup, we prevent a new sleep for
1978 * 5 s to give provision for user space to consume the event.
1980 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1981 device_can_wakeup(mmc_dev(host)))
1982 pm_wakeup_event(mmc_dev(host), 5000);
1984 host->detect_change = 1;
1985 mmc_schedule_delayed_work(&host->detect, delay);
1989 * mmc_detect_change - process change of state on a MMC socket
1990 * @host: host which changed state.
1991 * @delay: optional delay to wait before detection (jiffies)
1993 * MMC drivers should call this when they detect a card has been
1994 * inserted or removed. The MMC layer will confirm that any
1995 * present card is still functional, and initialize any newly
1998 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
2000 _mmc_detect_change(host, delay, true);
2002 EXPORT_SYMBOL(mmc_detect_change);
2004 void mmc_init_erase(struct mmc_card *card)
2008 if (is_power_of_2(card->erase_size))
2009 card->erase_shift = ffs(card->erase_size) - 1;
2011 card->erase_shift = 0;
2014 * It is possible to erase an arbitrarily large area of an SD or MMC
2015 * card. That is not desirable because it can take a long time
2016 * (minutes) potentially delaying more important I/O, and also the
2017 * timeout calculations become increasingly hugely over-estimated.
2018 * Consequently, 'pref_erase' is defined as a guide to limit erases
2019 * to that size and alignment.
2021 * For SD cards that define Allocation Unit size, limit erases to one
2022 * Allocation Unit at a time.
2023 * For MMC, have a stab at ai good value and for modern cards it will
2024 * end up being 4MiB. Note that if the value is too small, it can end
2025 * up taking longer to erase. Also note, erase_size is already set to
2026 * High Capacity Erase Size if available when this function is called.
2028 if (mmc_card_sd(card) && card->ssr.au) {
2029 card->pref_erase = card->ssr.au;
2030 card->erase_shift = ffs(card->ssr.au) - 1;
2031 } else if (card->erase_size) {
2032 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
2034 card->pref_erase = 512 * 1024 / 512;
2036 card->pref_erase = 1024 * 1024 / 512;
2038 card->pref_erase = 2 * 1024 * 1024 / 512;
2040 card->pref_erase = 4 * 1024 * 1024 / 512;
2041 if (card->pref_erase < card->erase_size)
2042 card->pref_erase = card->erase_size;
2044 sz = card->pref_erase % card->erase_size;
2046 card->pref_erase += card->erase_size - sz;
2049 card->pref_erase = 0;
2052 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
2053 unsigned int arg, unsigned int qty)
2055 unsigned int erase_timeout;
2057 if (arg == MMC_DISCARD_ARG ||
2058 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
2059 erase_timeout = card->ext_csd.trim_timeout;
2060 } else if (card->ext_csd.erase_group_def & 1) {
2061 /* High Capacity Erase Group Size uses HC timeouts */
2062 if (arg == MMC_TRIM_ARG)
2063 erase_timeout = card->ext_csd.trim_timeout;
2065 erase_timeout = card->ext_csd.hc_erase_timeout;
2067 /* CSD Erase Group Size uses write timeout */
2068 unsigned int mult = (10 << card->csd.r2w_factor);
2069 unsigned int timeout_clks = card->csd.taac_clks * mult;
2070 unsigned int timeout_us;
2072 /* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */
2073 if (card->csd.taac_ns < 1000000)
2074 timeout_us = (card->csd.taac_ns * mult) / 1000;
2076 timeout_us = (card->csd.taac_ns / 1000) * mult;
2079 * ios.clock is only a target. The real clock rate might be
2080 * less but not that much less, so fudge it by multiplying by 2.
2083 timeout_us += (timeout_clks * 1000) /
2084 (card->host->ios.clock / 1000);
2086 erase_timeout = timeout_us / 1000;
2089 * Theoretically, the calculation could underflow so round up
2090 * to 1ms in that case.
2096 /* Multiplier for secure operations */
2097 if (arg & MMC_SECURE_ARGS) {
2098 if (arg == MMC_SECURE_ERASE_ARG)
2099 erase_timeout *= card->ext_csd.sec_erase_mult;
2101 erase_timeout *= card->ext_csd.sec_trim_mult;
2104 erase_timeout *= qty;
2107 * Ensure at least a 1 second timeout for SPI as per
2108 * 'mmc_set_data_timeout()'
2110 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2111 erase_timeout = 1000;
2113 return erase_timeout;
2116 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2120 unsigned int erase_timeout;
2122 if (card->ssr.erase_timeout) {
2123 /* Erase timeout specified in SD Status Register (SSR) */
2124 erase_timeout = card->ssr.erase_timeout * qty +
2125 card->ssr.erase_offset;
2128 * Erase timeout not specified in SD Status Register (SSR) so
2129 * use 250ms per write block.
2131 erase_timeout = 250 * qty;
2134 /* Must not be less than 1 second */
2135 if (erase_timeout < 1000)
2136 erase_timeout = 1000;
2138 return erase_timeout;
2141 static unsigned int mmc_erase_timeout(struct mmc_card *card,
2145 if (mmc_card_sd(card))
2146 return mmc_sd_erase_timeout(card, arg, qty);
2148 return mmc_mmc_erase_timeout(card, arg, qty);
2151 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2152 unsigned int to, unsigned int arg)
2154 struct mmc_command cmd = {};
2155 unsigned int qty = 0, busy_timeout = 0;
2156 bool use_r1b_resp = false;
2157 unsigned long timeout;
2160 mmc_retune_hold(card->host);
2163 * qty is used to calculate the erase timeout which depends on how many
2164 * erase groups (or allocation units in SD terminology) are affected.
2165 * We count erasing part of an erase group as one erase group.
2166 * For SD, the allocation units are always a power of 2. For MMC, the
2167 * erase group size is almost certainly also power of 2, but it does not
2168 * seem to insist on that in the JEDEC standard, so we fall back to
2169 * division in that case. SD may not specify an allocation unit size,
2170 * in which case the timeout is based on the number of write blocks.
2172 * Note that the timeout for secure trim 2 will only be correct if the
2173 * number of erase groups specified is the same as the total of all
2174 * preceding secure trim 1 commands. Since the power may have been
2175 * lost since the secure trim 1 commands occurred, it is generally
2176 * impossible to calculate the secure trim 2 timeout correctly.
2178 if (card->erase_shift)
2179 qty += ((to >> card->erase_shift) -
2180 (from >> card->erase_shift)) + 1;
2181 else if (mmc_card_sd(card))
2182 qty += to - from + 1;
2184 qty += ((to / card->erase_size) -
2185 (from / card->erase_size)) + 1;
2187 if (!mmc_card_blockaddr(card)) {
2192 if (mmc_card_sd(card))
2193 cmd.opcode = SD_ERASE_WR_BLK_START;
2195 cmd.opcode = MMC_ERASE_GROUP_START;
2197 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2198 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2200 pr_err("mmc_erase: group start error %d, "
2201 "status %#x\n", err, cmd.resp[0]);
2206 memset(&cmd, 0, sizeof(struct mmc_command));
2207 if (mmc_card_sd(card))
2208 cmd.opcode = SD_ERASE_WR_BLK_END;
2210 cmd.opcode = MMC_ERASE_GROUP_END;
2212 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2213 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2215 pr_err("mmc_erase: group end error %d, status %#x\n",
2221 memset(&cmd, 0, sizeof(struct mmc_command));
2222 cmd.opcode = MMC_ERASE;
2224 busy_timeout = mmc_erase_timeout(card, arg, qty);
2226 * If the host controller supports busy signalling and the timeout for
2227 * the erase operation does not exceed the max_busy_timeout, we should
2228 * use R1B response. Or we need to prevent the host from doing hw busy
2229 * detection, which is done by converting to a R1 response instead.
2231 if (card->host->max_busy_timeout &&
2232 busy_timeout > card->host->max_busy_timeout) {
2233 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2235 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2236 cmd.busy_timeout = busy_timeout;
2237 use_r1b_resp = true;
2240 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2242 pr_err("mmc_erase: erase error %d, status %#x\n",
2248 if (mmc_host_is_spi(card->host))
2252 * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
2255 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
2258 timeout = jiffies + msecs_to_jiffies(busy_timeout);
2260 memset(&cmd, 0, sizeof(struct mmc_command));
2261 cmd.opcode = MMC_SEND_STATUS;
2262 cmd.arg = card->rca << 16;
2263 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2264 /* Do not retry else we can't see errors */
2265 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2266 if (err || (cmd.resp[0] & 0xFDF92000)) {
2267 pr_err("error %d requesting status %#x\n",
2273 /* Timeout if the device never becomes ready for data and
2274 * never leaves the program state.
2276 if (time_after(jiffies, timeout)) {
2277 pr_err("%s: Card stuck in programming state! %s\n",
2278 mmc_hostname(card->host), __func__);
2283 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2284 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2286 mmc_retune_release(card->host);
2290 static unsigned int mmc_align_erase_size(struct mmc_card *card,
2295 unsigned int from_new = *from, nr_new = nr, rem;
2298 * When the 'card->erase_size' is power of 2, we can use round_up/down()
2299 * to align the erase size efficiently.
2301 if (is_power_of_2(card->erase_size)) {
2302 unsigned int temp = from_new;
2304 from_new = round_up(temp, card->erase_size);
2305 rem = from_new - temp;
2312 nr_new = round_down(nr_new, card->erase_size);
2314 rem = from_new % card->erase_size;
2316 rem = card->erase_size - rem;
2324 rem = nr_new % card->erase_size;
2332 *to = from_new + nr_new;
2339 * mmc_erase - erase sectors.
2340 * @card: card to erase
2341 * @from: first sector to erase
2342 * @nr: number of sectors to erase
2343 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2345 * Caller must claim host before calling this function.
2347 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2350 unsigned int rem, to = from + nr;
2353 if (!(card->host->caps & MMC_CAP_ERASE) ||
2354 !(card->csd.cmdclass & CCC_ERASE))
2357 if (!card->erase_size)
2360 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2363 if ((arg & MMC_SECURE_ARGS) &&
2364 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2367 if ((arg & MMC_TRIM_ARGS) &&
2368 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2371 if (arg == MMC_SECURE_ERASE_ARG) {
2372 if (from % card->erase_size || nr % card->erase_size)
2376 if (arg == MMC_ERASE_ARG)
2377 nr = mmc_align_erase_size(card, &from, &to, nr);
2385 /* 'from' and 'to' are inclusive */
2389 * Special case where only one erase-group fits in the timeout budget:
2390 * If the region crosses an erase-group boundary on this particular
2391 * case, we will be trimming more than one erase-group which, does not
2392 * fit in the timeout budget of the controller, so we need to split it
2393 * and call mmc_do_erase() twice if necessary. This special case is
2394 * identified by the card->eg_boundary flag.
2396 rem = card->erase_size - (from % card->erase_size);
2397 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2398 err = mmc_do_erase(card, from, from + rem - 1, arg);
2400 if ((err) || (to <= from))
2404 return mmc_do_erase(card, from, to, arg);
2406 EXPORT_SYMBOL(mmc_erase);
2408 int mmc_can_erase(struct mmc_card *card)
2410 if ((card->host->caps & MMC_CAP_ERASE) &&
2411 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2415 EXPORT_SYMBOL(mmc_can_erase);
2417 int mmc_can_trim(struct mmc_card *card)
2419 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2420 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2424 EXPORT_SYMBOL(mmc_can_trim);
2426 int mmc_can_discard(struct mmc_card *card)
2429 * As there's no way to detect the discard support bit at v4.5
2430 * use the s/w feature support filed.
2432 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2436 EXPORT_SYMBOL(mmc_can_discard);
2438 int mmc_can_sanitize(struct mmc_card *card)
2440 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2442 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2446 EXPORT_SYMBOL(mmc_can_sanitize);
2448 int mmc_can_secure_erase_trim(struct mmc_card *card)
2450 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2451 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2455 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2457 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2460 if (!card->erase_size)
2462 if (from % card->erase_size || nr % card->erase_size)
2466 EXPORT_SYMBOL(mmc_erase_group_aligned);
2468 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2471 struct mmc_host *host = card->host;
2472 unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
2473 unsigned int last_timeout = 0;
2474 unsigned int max_busy_timeout = host->max_busy_timeout ?
2475 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
2477 if (card->erase_shift) {
2478 max_qty = UINT_MAX >> card->erase_shift;
2479 min_qty = card->pref_erase >> card->erase_shift;
2480 } else if (mmc_card_sd(card)) {
2482 min_qty = card->pref_erase;
2484 max_qty = UINT_MAX / card->erase_size;
2485 min_qty = card->pref_erase / card->erase_size;
2489 * We should not only use 'host->max_busy_timeout' as the limitation
2490 * when deciding the max discard sectors. We should set a balance value
2491 * to improve the erase speed, and it can not get too long timeout at
2494 * Here we set 'card->pref_erase' as the minimal discard sectors no
2495 * matter what size of 'host->max_busy_timeout', but if the
2496 * 'host->max_busy_timeout' is large enough for more discard sectors,
2497 * then we can continue to increase the max discard sectors until we
2498 * get a balance value. In cases when the 'host->max_busy_timeout'
2499 * isn't specified, use the default max erase timeout.
2503 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2504 timeout = mmc_erase_timeout(card, arg, qty + x);
2506 if (qty + x > min_qty && timeout > max_busy_timeout)
2509 if (timeout < last_timeout)
2511 last_timeout = timeout;
2521 * When specifying a sector range to trim, chances are we might cross
2522 * an erase-group boundary even if the amount of sectors is less than
2524 * If we can only fit one erase-group in the controller timeout budget,
2525 * we have to care that erase-group boundaries are not crossed by a
2526 * single trim operation. We flag that special case with "eg_boundary".
2527 * In all other cases we can just decrement qty and pretend that we
2528 * always touch (qty + 1) erase-groups as a simple optimization.
2531 card->eg_boundary = 1;
2535 /* Convert qty to sectors */
2536 if (card->erase_shift)
2537 max_discard = qty << card->erase_shift;
2538 else if (mmc_card_sd(card))
2539 max_discard = qty + 1;
2541 max_discard = qty * card->erase_size;
2546 unsigned int mmc_calc_max_discard(struct mmc_card *card)
2548 struct mmc_host *host = card->host;
2549 unsigned int max_discard, max_trim;
2552 * Without erase_group_def set, MMC erase timeout depends on clock
2553 * frequence which can change. In that case, the best choice is
2554 * just the preferred erase size.
2556 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2557 return card->pref_erase;
2559 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2560 if (mmc_can_trim(card)) {
2561 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2562 if (max_trim < max_discard)
2563 max_discard = max_trim;
2564 } else if (max_discard < card->erase_size) {
2567 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2568 mmc_hostname(host), max_discard, host->max_busy_timeout ?
2569 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
2572 EXPORT_SYMBOL(mmc_calc_max_discard);
2574 bool mmc_card_is_blockaddr(struct mmc_card *card)
2576 return card ? mmc_card_blockaddr(card) : false;
2578 EXPORT_SYMBOL(mmc_card_is_blockaddr);
2580 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2582 struct mmc_command cmd = {};
2584 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
2585 mmc_card_hs400(card) || mmc_card_hs400es(card))
2588 cmd.opcode = MMC_SET_BLOCKLEN;
2590 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2591 return mmc_wait_for_cmd(card->host, &cmd, 5);
2593 EXPORT_SYMBOL(mmc_set_blocklen);
2595 int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2598 struct mmc_command cmd = {};
2600 cmd.opcode = MMC_SET_BLOCK_COUNT;
2601 cmd.arg = blockcount & 0x0000FFFF;
2604 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2605 return mmc_wait_for_cmd(card->host, &cmd, 5);
2607 EXPORT_SYMBOL(mmc_set_blockcount);
2609 static void mmc_hw_reset_for_init(struct mmc_host *host)
2611 mmc_pwrseq_reset(host);
2613 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2615 host->ops->hw_reset(host);
2618 int mmc_hw_reset(struct mmc_host *host)
2626 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2631 ret = host->bus_ops->reset(host);
2635 pr_warn("%s: tried to reset card, got error %d\n",
2636 mmc_hostname(host), ret);
2640 EXPORT_SYMBOL(mmc_hw_reset);
2642 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2644 host->f_init = freq;
2646 pr_debug("%s: %s: trying to init card at %u Hz\n",
2647 mmc_hostname(host), __func__, host->f_init);
2649 mmc_power_up(host, host->ocr_avail);
2652 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2653 * do a hardware reset if possible.
2655 mmc_hw_reset_for_init(host);
2658 * sdio_reset sends CMD52 to reset card. Since we do not know
2659 * if the card is being re-initialized, just send it. CMD52
2660 * should be ignored by SD/eMMC cards.
2661 * Skip it if we already know that we do not support SDIO commands
2663 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2668 if (!(host->caps2 & MMC_CAP2_NO_SD))
2669 mmc_send_if_cond(host, host->ocr_avail);
2671 /* Order's important: probe SDIO, then SD, then MMC */
2672 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2673 if (!mmc_attach_sdio(host))
2676 if (!(host->caps2 & MMC_CAP2_NO_SD))
2677 if (!mmc_attach_sd(host))
2680 if (!(host->caps2 & MMC_CAP2_NO_MMC))
2681 if (!mmc_attach_mmc(host))
2684 mmc_power_off(host);
2688 int _mmc_detect_card_removed(struct mmc_host *host)
2692 if (!host->card || mmc_card_removed(host->card))
2695 ret = host->bus_ops->alive(host);
2698 * Card detect status and alive check may be out of sync if card is
2699 * removed slowly, when card detect switch changes while card/slot
2700 * pads are still contacted in hardware (refer to "SD Card Mechanical
2701 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2702 * detect work 200ms later for this case.
2704 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2705 mmc_detect_change(host, msecs_to_jiffies(200));
2706 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2710 mmc_card_set_removed(host->card);
2711 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2717 int mmc_detect_card_removed(struct mmc_host *host)
2719 struct mmc_card *card = host->card;
2722 WARN_ON(!host->claimed);
2727 if (!mmc_card_is_removable(host))
2730 ret = mmc_card_removed(card);
2732 * The card will be considered unchanged unless we have been asked to
2733 * detect a change or host requires polling to provide card detection.
2735 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2738 host->detect_change = 0;
2740 ret = _mmc_detect_card_removed(host);
2741 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2743 * Schedule a detect work as soon as possible to let a
2744 * rescan handle the card removal.
2746 cancel_delayed_work(&host->detect);
2747 _mmc_detect_change(host, 0, false);
2753 EXPORT_SYMBOL(mmc_detect_card_removed);
2755 void mmc_rescan(struct work_struct *work)
2757 struct mmc_host *host =
2758 container_of(work, struct mmc_host, detect.work);
2761 if (host->rescan_disable)
2764 /* If there is a non-removable card registered, only scan once */
2765 if (!mmc_card_is_removable(host) && host->rescan_entered)
2767 host->rescan_entered = 1;
2769 if (host->trigger_card_event && host->ops->card_event) {
2770 mmc_claim_host(host);
2771 host->ops->card_event(host);
2772 mmc_release_host(host);
2773 host->trigger_card_event = false;
2779 * if there is a _removable_ card registered, check whether it is
2782 if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host))
2783 host->bus_ops->detect(host);
2785 host->detect_change = 0;
2788 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2789 * the card is no longer present.
2794 /* if there still is a card present, stop here */
2795 if (host->bus_ops != NULL) {
2801 * Only we can add a new handler, so it's safe to
2802 * release the lock here.
2806 mmc_claim_host(host);
2807 if (mmc_card_is_removable(host) && host->ops->get_cd &&
2808 host->ops->get_cd(host) == 0) {
2809 mmc_power_off(host);
2810 mmc_release_host(host);
2814 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2815 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2817 if (freqs[i] <= host->f_min)
2820 mmc_release_host(host);
2823 if (host->caps & MMC_CAP_NEEDS_POLL)
2824 mmc_schedule_delayed_work(&host->detect, HZ);
2827 void mmc_start_host(struct mmc_host *host)
2829 host->f_init = max(freqs[0], host->f_min);
2830 host->rescan_disable = 0;
2831 host->ios.power_mode = MMC_POWER_UNDEFINED;
2833 if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
2834 mmc_claim_host(host);
2835 mmc_power_up(host, host->ocr_avail);
2836 mmc_release_host(host);
2839 mmc_gpiod_request_cd_irq(host);
2840 _mmc_detect_change(host, 0, false);
2843 void mmc_stop_host(struct mmc_host *host)
2845 if (host->slot.cd_irq >= 0) {
2846 if (host->slot.cd_wake_enabled)
2847 disable_irq_wake(host->slot.cd_irq);
2848 disable_irq(host->slot.cd_irq);
2851 host->rescan_disable = 1;
2852 cancel_delayed_work_sync(&host->detect);
2854 /* clear pm flags now and let card drivers set them as needed */
2858 if (host->bus_ops && !host->bus_dead) {
2859 /* Calling bus_ops->remove() with a claimed host can deadlock */
2860 host->bus_ops->remove(host);
2861 mmc_claim_host(host);
2862 mmc_detach_bus(host);
2863 mmc_power_off(host);
2864 mmc_release_host(host);
2870 mmc_claim_host(host);
2871 mmc_power_off(host);
2872 mmc_release_host(host);
2875 int mmc_power_save_host(struct mmc_host *host)
2879 pr_debug("%s: %s: powering down\n", mmc_hostname(host), __func__);
2883 if (!host->bus_ops || host->bus_dead) {
2888 if (host->bus_ops->power_save)
2889 ret = host->bus_ops->power_save(host);
2893 mmc_power_off(host);
2897 EXPORT_SYMBOL(mmc_power_save_host);
2899 int mmc_power_restore_host(struct mmc_host *host)
2903 pr_debug("%s: %s: powering up\n", mmc_hostname(host), __func__);
2907 if (!host->bus_ops || host->bus_dead) {
2912 mmc_power_up(host, host->card->ocr);
2913 ret = host->bus_ops->power_restore(host);
2919 EXPORT_SYMBOL(mmc_power_restore_host);
2921 #ifdef CONFIG_PM_SLEEP
2922 /* Do the card removal on suspend if card is assumed removeable
2923 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2926 static int mmc_pm_notify(struct notifier_block *notify_block,
2927 unsigned long mode, void *unused)
2929 struct mmc_host *host = container_of(
2930 notify_block, struct mmc_host, pm_notify);
2931 unsigned long flags;
2935 case PM_HIBERNATION_PREPARE:
2936 case PM_SUSPEND_PREPARE:
2937 case PM_RESTORE_PREPARE:
2938 spin_lock_irqsave(&host->lock, flags);
2939 host->rescan_disable = 1;
2940 spin_unlock_irqrestore(&host->lock, flags);
2941 cancel_delayed_work_sync(&host->detect);
2946 /* Validate prerequisites for suspend */
2947 if (host->bus_ops->pre_suspend)
2948 err = host->bus_ops->pre_suspend(host);
2952 /* Calling bus_ops->remove() with a claimed host can deadlock */
2953 host->bus_ops->remove(host);
2954 mmc_claim_host(host);
2955 mmc_detach_bus(host);
2956 mmc_power_off(host);
2957 mmc_release_host(host);
2961 case PM_POST_SUSPEND:
2962 case PM_POST_HIBERNATION:
2963 case PM_POST_RESTORE:
2965 spin_lock_irqsave(&host->lock, flags);
2966 host->rescan_disable = 0;
2967 spin_unlock_irqrestore(&host->lock, flags);
2968 _mmc_detect_change(host, 0, false);
2975 void mmc_register_pm_notifier(struct mmc_host *host)
2977 host->pm_notify.notifier_call = mmc_pm_notify;
2978 register_pm_notifier(&host->pm_notify);
2981 void mmc_unregister_pm_notifier(struct mmc_host *host)
2983 unregister_pm_notifier(&host->pm_notify);
2988 * mmc_init_context_info() - init synchronization context
2991 * Init struct context_info needed to implement asynchronous
2992 * request mechanism, used by mmc core, host driver and mmc requests
2995 void mmc_init_context_info(struct mmc_host *host)
2997 host->context_info.is_new_req = false;
2998 host->context_info.is_done_rcv = false;
2999 host->context_info.is_waiting_last_req = false;
3000 init_waitqueue_head(&host->context_info.wait);
3003 static int __init mmc_init(void)
3007 ret = mmc_register_bus();
3011 ret = mmc_register_host_class();
3013 goto unregister_bus;
3015 ret = sdio_register_bus();
3017 goto unregister_host_class;
3021 unregister_host_class:
3022 mmc_unregister_host_class();
3024 mmc_unregister_bus();
3028 static void __exit mmc_exit(void)
3030 sdio_unregister_bus();
3031 mmc_unregister_host_class();
3032 mmc_unregister_bus();
3035 subsys_initcall(mmc_init);
3036 module_exit(mmc_exit);
3038 MODULE_LICENSE("GPL");