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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * linux/drivers/mmc/core/core.c
- *
- * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
- * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
- * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
- * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/completion.h>
- #include <linux/device.h>
- #include <linux/delay.h>
- #include <linux/pagemap.h>
- #include <linux/err.h>
- #include <linux/leds.h>
- #include <linux/scatterlist.h>
- #include <linux/log2.h>
- #include <linux/pm_runtime.h>
- #include <linux/pm_wakeup.h>
- #include <linux/suspend.h>
- #include <linux/fault-inject.h>
- #include <linux/random.h>
- #include <linux/slab.h>
- #include <linux/of.h>
- #include <linux/mmc/card.h>
- #include <linux/mmc/host.h>
- #include <linux/mmc/mmc.h>
- #include <linux/mmc/sd.h>
- #include <linux/mmc/slot-gpio.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/mmc.h>
- #include "core.h"
- #include "card.h"
- #include "crypto.h"
- #include "bus.h"
- #include "host.h"
- #include "sdio_bus.h"
- #include "pwrseq.h"
- #include "mmc_ops.h"
- #include "sd_ops.h"
- #include "sdio_ops.h"
- /* The max erase timeout, used when host->max_busy_timeout isn't specified */
- #define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
- #define SD_DISCARD_TIMEOUT_MS (250)
- static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
- /*
- * Enabling software CRCs on the data blocks can be a significant (30%)
- * performance cost, and for other reasons may not always be desired.
- * So we allow it it to be disabled.
- */
- bool use_spi_crc = 1;
- module_param(use_spi_crc, bool, 0);
- static int mmc_schedule_delayed_work(struct delayed_work *work,
- unsigned long delay)
- {
- /*
- * We use the system_freezable_wq, because of two reasons.
- * First, it allows several works (not the same work item) to be
- * executed simultaneously. Second, the queue becomes frozen when
- * userspace becomes frozen during system PM.
- */
- return queue_delayed_work(system_freezable_wq, work, delay);
- }
- #ifdef CONFIG_FAIL_MMC_REQUEST
- /*
- * Internal function. Inject random data errors.
- * If mmc_data is NULL no errors are injected.
- */
- static void mmc_should_fail_request(struct mmc_host *host,
- struct mmc_request *mrq)
- {
- struct mmc_command *cmd = mrq->cmd;
- struct mmc_data *data = mrq->data;
- static const int data_errors[] = {
- -ETIMEDOUT,
- -EILSEQ,
- -EIO,
- };
- if (!data)
- return;
- if ((cmd && cmd->error) || data->error ||
- !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
- return;
- data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
- data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
- }
- #else /* CONFIG_FAIL_MMC_REQUEST */
- static inline void mmc_should_fail_request(struct mmc_host *host,
- struct mmc_request *mrq)
- {
- }
- #endif /* CONFIG_FAIL_MMC_REQUEST */
- static inline void mmc_complete_cmd(struct mmc_request *mrq)
- {
- if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
- complete_all(&mrq->cmd_completion);
- }
- void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
- {
- if (!mrq->cap_cmd_during_tfr)
- return;
- mmc_complete_cmd(mrq);
- pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
- mmc_hostname(host), mrq->cmd->opcode);
- }
- EXPORT_SYMBOL(mmc_command_done);
- /**
- * mmc_request_done - finish processing an MMC request
- * @host: MMC host which completed request
- * @mrq: MMC request which request
- *
- * MMC drivers should call this function when they have completed
- * their processing of a request.
- */
- void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
- {
- struct mmc_command *cmd = mrq->cmd;
- int err = cmd->error;
- /* Flag re-tuning needed on CRC errors */
- if (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
- cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200 &&
- !host->retune_crc_disable &&
- (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
- (mrq->data && mrq->data->error == -EILSEQ) ||
- (mrq->stop && mrq->stop->error == -EILSEQ)))
- mmc_retune_needed(host);
- if (err && cmd->retries && mmc_host_is_spi(host)) {
- if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
- cmd->retries = 0;
- }
- if (host->ongoing_mrq == mrq)
- host->ongoing_mrq = NULL;
- mmc_complete_cmd(mrq);
- trace_mmc_request_done(host, mrq);
- /*
- * We list various conditions for the command to be considered
- * properly done:
- *
- * - There was no error, OK fine then
- * - We are not doing some kind of retry
- * - The card was removed (...so just complete everything no matter
- * if there are errors or retries)
- */
- if (!err || !cmd->retries || mmc_card_removed(host->card)) {
- mmc_should_fail_request(host, mrq);
- if (!host->ongoing_mrq)
- led_trigger_event(host->led, LED_OFF);
- if (mrq->sbc) {
- pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
- mmc_hostname(host), mrq->sbc->opcode,
- mrq->sbc->error,
- mrq->sbc->resp[0], mrq->sbc->resp[1],
- mrq->sbc->resp[2], mrq->sbc->resp[3]);
- }
- pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
- mmc_hostname(host), cmd->opcode, err,
- cmd->resp[0], cmd->resp[1],
- cmd->resp[2], cmd->resp[3]);
- if (mrq->data) {
- pr_debug("%s: %d bytes transferred: %d\n",
- mmc_hostname(host),
- mrq->data->bytes_xfered, mrq->data->error);
- }
- if (mrq->stop) {
- pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
- mmc_hostname(host), mrq->stop->opcode,
- mrq->stop->error,
- mrq->stop->resp[0], mrq->stop->resp[1],
- mrq->stop->resp[2], mrq->stop->resp[3]);
- }
- }
- /*
- * Request starter must handle retries - see
- * mmc_wait_for_req_done().
- */
- if (mrq->done)
- mrq->done(mrq);
- }
- EXPORT_SYMBOL(mmc_request_done);
- static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
- {
- int err;
- /* Assumes host controller has been runtime resumed by mmc_claim_host */
- err = mmc_retune(host);
- if (err) {
- mrq->cmd->error = err;
- mmc_request_done(host, mrq);
- return;
- }
- /*
- * For sdio rw commands we must wait for card busy otherwise some
- * sdio devices won't work properly.
- * And bypass I/O abort, reset and bus suspend operations.
- */
- if (sdio_is_io_busy(mrq->cmd->opcode, mrq->cmd->arg) &&
- host->ops->card_busy) {
- int tries = 500; /* Wait aprox 500ms at maximum */
- while (host->ops->card_busy(host) && --tries)
- mmc_delay(1);
- if (tries == 0) {
- mrq->cmd->error = -EBUSY;
- mmc_request_done(host, mrq);
- return;
- }
- }
- if (mrq->cap_cmd_during_tfr) {
- host->ongoing_mrq = mrq;
- /*
- * Retry path could come through here without having waiting on
- * cmd_completion, so ensure it is reinitialised.
- */
- reinit_completion(&mrq->cmd_completion);
- }
- trace_mmc_request_start(host, mrq);
- if (host->cqe_on)
- host->cqe_ops->cqe_off(host);
- host->ops->request(host, mrq);
- }
- static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq,
- bool cqe)
- {
- if (mrq->sbc) {
- pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
- mmc_hostname(host), mrq->sbc->opcode,
- mrq->sbc->arg, mrq->sbc->flags);
- }
- if (mrq->cmd) {
- pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n",
- mmc_hostname(host), cqe ? "CQE direct " : "",
- mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
- } else if (cqe) {
- pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n",
- mmc_hostname(host), mrq->tag, mrq->data->blk_addr);
- }
- if (mrq->data) {
- pr_debug("%s: blksz %d blocks %d flags %08x "
- "tsac %d ms nsac %d\n",
- mmc_hostname(host), mrq->data->blksz,
- mrq->data->blocks, mrq->data->flags,
- mrq->data->timeout_ns / 1000000,
- mrq->data->timeout_clks);
- }
- if (mrq->stop) {
- pr_debug("%s: CMD%u arg %08x flags %08x\n",
- mmc_hostname(host), mrq->stop->opcode,
- mrq->stop->arg, mrq->stop->flags);
- }
- }
- static int mmc_mrq_prep(struct mmc_host *host, struct mmc_request *mrq)
- {
- unsigned int i, sz = 0;
- struct scatterlist *sg;
- if (mrq->cmd) {
- mrq->cmd->error = 0;
- mrq->cmd->mrq = mrq;
- mrq->cmd->data = mrq->data;
- }
- if (mrq->sbc) {
- mrq->sbc->error = 0;
- mrq->sbc->mrq = mrq;
- }
- if (mrq->data) {
- if (mrq->data->blksz > host->max_blk_size ||
- mrq->data->blocks > host->max_blk_count ||
- mrq->data->blocks * mrq->data->blksz > host->max_req_size)
- return -EINVAL;
- for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
- sz += sg->length;
- if (sz != mrq->data->blocks * mrq->data->blksz)
- return -EINVAL;
- mrq->data->error = 0;
- mrq->data->mrq = mrq;
- if (mrq->stop) {
- mrq->data->stop = mrq->stop;
- mrq->stop->error = 0;
- mrq->stop->mrq = mrq;
- }
- }
- return 0;
- }
- int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
- {
- int err;
- init_completion(&mrq->cmd_completion);
- mmc_retune_hold(host);
- if (mmc_card_removed(host->card))
- return -ENOMEDIUM;
- mmc_mrq_pr_debug(host, mrq, false);
- WARN_ON(!host->claimed);
- err = mmc_mrq_prep(host, mrq);
- if (err)
- return err;
- led_trigger_event(host->led, LED_FULL);
- __mmc_start_request(host, mrq);
- return 0;
- }
- EXPORT_SYMBOL(mmc_start_request);
- static void mmc_wait_done(struct mmc_request *mrq)
- {
- complete(&mrq->completion);
- }
- static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
- {
- struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
- /*
- * If there is an ongoing transfer, wait for the command line to become
- * available.
- */
- if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
- wait_for_completion(&ongoing_mrq->cmd_completion);
- }
- static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
- {
- int err;
- mmc_wait_ongoing_tfr_cmd(host);
- init_completion(&mrq->completion);
- mrq->done = mmc_wait_done;
- err = mmc_start_request(host, mrq);
- if (err) {
- mrq->cmd->error = err;
- mmc_complete_cmd(mrq);
- complete(&mrq->completion);
- }
- return err;
- }
- void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
- {
- struct mmc_command *cmd;
- while (1) {
- wait_for_completion(&mrq->completion);
- cmd = mrq->cmd;
- if (!cmd->error || !cmd->retries ||
- mmc_card_removed(host->card))
- break;
- mmc_retune_recheck(host);
- pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
- mmc_hostname(host), cmd->opcode, cmd->error);
- cmd->retries--;
- cmd->error = 0;
- __mmc_start_request(host, mrq);
- }
- mmc_retune_release(host);
- }
- EXPORT_SYMBOL(mmc_wait_for_req_done);
- /*
- * mmc_cqe_start_req - Start a CQE request.
- * @host: MMC host to start the request
- * @mrq: request to start
- *
- * Start the request, re-tuning if needed and it is possible. Returns an error
- * code if the request fails to start or -EBUSY if CQE is busy.
- */
- int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
- {
- int err;
- /*
- * CQE cannot process re-tuning commands. Caller must hold retuning
- * while CQE is in use. Re-tuning can happen here only when CQE has no
- * active requests i.e. this is the first. Note, re-tuning will call
- * ->cqe_off().
- */
- err = mmc_retune(host);
- if (err)
- goto out_err;
- mrq->host = host;
- mmc_mrq_pr_debug(host, mrq, true);
- err = mmc_mrq_prep(host, mrq);
- if (err)
- goto out_err;
- err = host->cqe_ops->cqe_request(host, mrq);
- if (err)
- goto out_err;
- trace_mmc_request_start(host, mrq);
- return 0;
- out_err:
- if (mrq->cmd) {
- pr_debug("%s: failed to start CQE direct CMD%u, error %d\n",
- mmc_hostname(host), mrq->cmd->opcode, err);
- } else {
- pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n",
- mmc_hostname(host), mrq->tag, err);
- }
- return err;
- }
- EXPORT_SYMBOL(mmc_cqe_start_req);
- /**
- * mmc_cqe_request_done - CQE has finished processing an MMC request
- * @host: MMC host which completed request
- * @mrq: MMC request which completed
- *
- * CQE drivers should call this function when they have completed
- * their processing of a request.
- */
- void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
- {
- mmc_should_fail_request(host, mrq);
- /* Flag re-tuning needed on CRC errors */
- if ((mrq->cmd && mrq->cmd->error == -EILSEQ) ||
- (mrq->data && mrq->data->error == -EILSEQ))
- mmc_retune_needed(host);
- trace_mmc_request_done(host, mrq);
- if (mrq->cmd) {
- pr_debug("%s: CQE req done (direct CMD%u): %d\n",
- mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error);
- } else {
- pr_debug("%s: CQE transfer done tag %d\n",
- mmc_hostname(host), mrq->tag);
- }
- if (mrq->data) {
- pr_debug("%s: %d bytes transferred: %d\n",
- mmc_hostname(host),
- mrq->data->bytes_xfered, mrq->data->error);
- }
- mrq->done(mrq);
- }
- EXPORT_SYMBOL(mmc_cqe_request_done);
- /**
- * mmc_cqe_post_req - CQE post process of a completed MMC request
- * @host: MMC host
- * @mrq: MMC request to be processed
- */
- void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq)
- {
- if (host->cqe_ops->cqe_post_req)
- host->cqe_ops->cqe_post_req(host, mrq);
- }
- EXPORT_SYMBOL(mmc_cqe_post_req);
- /* Arbitrary 1 second timeout */
- #define MMC_CQE_RECOVERY_TIMEOUT 1000
- /*
- * mmc_cqe_recovery - Recover from CQE errors.
- * @host: MMC host to recover
- *
- * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in
- * in eMMC, and discarding the queue in CQE. CQE must call
- * mmc_cqe_request_done() on all requests. An error is returned if the eMMC
- * fails to discard its queue.
- */
- int mmc_cqe_recovery(struct mmc_host *host)
- {
- struct mmc_command cmd;
- int err;
- mmc_retune_hold_now(host);
- /*
- * Recovery is expected seldom, if at all, but it reduces performance,
- * so make sure it is not completely silent.
- */
- pr_warn("%s: running CQE recovery\n", mmc_hostname(host));
- host->cqe_ops->cqe_recovery_start(host);
- memset(&cmd, 0, sizeof(cmd));
- cmd.opcode = MMC_STOP_TRANSMISSION,
- cmd.flags = MMC_RSP_R1B | MMC_CMD_AC,
- cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
- cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
- mmc_wait_for_cmd(host, &cmd, 0);
- memset(&cmd, 0, sizeof(cmd));
- cmd.opcode = MMC_CMDQ_TASK_MGMT;
- cmd.arg = 1; /* Discard entire queue */
- cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
- cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
- cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
- err = mmc_wait_for_cmd(host, &cmd, 0);
- host->cqe_ops->cqe_recovery_finish(host);
- mmc_retune_release(host);
- return err;
- }
- EXPORT_SYMBOL(mmc_cqe_recovery);
- /**
- * mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
- * @host: MMC host
- * @mrq: MMC request
- *
- * mmc_is_req_done() is used with requests that have
- * mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
- * starting a request and before waiting for it to complete. That is,
- * either in between calls to mmc_start_req(), or after mmc_wait_for_req()
- * and before mmc_wait_for_req_done(). If it is called at other times the
- * result is not meaningful.
- */
- bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
- {
- return completion_done(&mrq->completion);
- }
- EXPORT_SYMBOL(mmc_is_req_done);
- /**
- * mmc_wait_for_req - start a request and wait for completion
- * @host: MMC host to start command
- * @mrq: MMC request to start
- *
- * Start a new MMC custom command request for a host, and wait
- * for the command to complete. In the case of 'cap_cmd_during_tfr'
- * requests, the transfer is ongoing and the caller can issue further
- * commands that do not use the data lines, and then wait by calling
- * mmc_wait_for_req_done().
- * Does not attempt to parse the response.
- */
- void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
- {
- __mmc_start_req(host, mrq);
- if (!mrq->cap_cmd_during_tfr)
- mmc_wait_for_req_done(host, mrq);
- }
- EXPORT_SYMBOL(mmc_wait_for_req);
- /**
- * mmc_wait_for_cmd - start a command and wait for completion
- * @host: MMC host to start command
- * @cmd: MMC command to start
- * @retries: maximum number of retries
- *
- * Start a new MMC command for a host, and wait for the command
- * to complete. Return any error that occurred while the command
- * was executing. Do not attempt to parse the response.
- */
- int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
- {
- struct mmc_request mrq = {};
- WARN_ON(!host->claimed);
- memset(cmd->resp, 0, sizeof(cmd->resp));
- cmd->retries = retries;
- mrq.cmd = cmd;
- cmd->data = NULL;
- mmc_wait_for_req(host, &mrq);
- return cmd->error;
- }
- EXPORT_SYMBOL(mmc_wait_for_cmd);
- /**
- * mmc_set_data_timeout - set the timeout for a data command
- * @data: data phase for command
- * @card: the MMC card associated with the data transfer
- *
- * Computes the data timeout parameters according to the
- * correct algorithm given the card type.
- */
- void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
- {
- unsigned int mult;
- /*
- * SDIO cards only define an upper 1 s limit on access.
- */
- if (mmc_card_sdio(card)) {
- data->timeout_ns = 1000000000;
- data->timeout_clks = 0;
- return;
- }
- /*
- * SD cards use a 100 multiplier rather than 10
- */
- mult = mmc_card_sd(card) ? 100 : 10;
- /*
- * Scale up the multiplier (and therefore the timeout) by
- * the r2w factor for writes.
- */
- if (data->flags & MMC_DATA_WRITE)
- mult <<= card->csd.r2w_factor;
- data->timeout_ns = card->csd.taac_ns * mult;
- data->timeout_clks = card->csd.taac_clks * mult;
- /*
- * SD cards also have an upper limit on the timeout.
- */
- if (mmc_card_sd(card)) {
- unsigned int timeout_us, limit_us;
- timeout_us = data->timeout_ns / 1000;
- if (card->host->ios.clock)
- timeout_us += data->timeout_clks * 1000 /
- (card->host->ios.clock / 1000);
- if (data->flags & MMC_DATA_WRITE)
- /*
- * The MMC spec "It is strongly recommended
- * for hosts to implement more than 500ms
- * timeout value even if the card indicates
- * the 250ms maximum busy length." Even the
- * previous value of 300ms is known to be
- * insufficient for some cards.
- */
- limit_us = 3000000;
- else
- limit_us = 100000;
- /*
- * SDHC cards always use these fixed values.
- */
- if (timeout_us > limit_us) {
- data->timeout_ns = limit_us * 1000;
- data->timeout_clks = 0;
- }
- /* assign limit value if invalid */
- if (timeout_us == 0)
- data->timeout_ns = limit_us * 1000;
- }
- /*
- * Some cards require longer data read timeout than indicated in CSD.
- * Address this by setting the read timeout to a "reasonably high"
- * value. For the cards tested, 600ms has proven enough. If necessary,
- * this value can be increased if other problematic cards require this.
- */
- if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
- data->timeout_ns = 600000000;
- data->timeout_clks = 0;
- }
- /*
- * Some cards need very high timeouts if driven in SPI mode.
- * The worst observed timeout was 900ms after writing a
- * continuous stream of data until the internal logic
- * overflowed.
- */
- if (mmc_host_is_spi(card->host)) {
- if (data->flags & MMC_DATA_WRITE) {
- if (data->timeout_ns < 1000000000)
- data->timeout_ns = 1000000000; /* 1s */
- } else {
- if (data->timeout_ns < 100000000)
- data->timeout_ns = 100000000; /* 100ms */
- }
- }
- }
- EXPORT_SYMBOL(mmc_set_data_timeout);
- /*
- * Allow claiming an already claimed host if the context is the same or there is
- * no context but the task is the same.
- */
- static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
- struct task_struct *task)
- {
- return host->claimer == ctx ||
- (!ctx && task && host->claimer->task == task);
- }
- static inline void mmc_ctx_set_claimer(struct mmc_host *host,
- struct mmc_ctx *ctx,
- struct task_struct *task)
- {
- if (!host->claimer) {
- if (ctx)
- host->claimer = ctx;
- else
- host->claimer = &host->default_ctx;
- }
- if (task)
- host->claimer->task = task;
- }
- /**
- * __mmc_claim_host - exclusively claim a host
- * @host: mmc host to claim
- * @ctx: context that claims the host or NULL in which case the default
- * context will be used
- * @abort: whether or not the operation should be aborted
- *
- * Claim a host for a set of operations. If @abort is non null and
- * dereference a non-zero value then this will return prematurely with
- * that non-zero value without acquiring the lock. Returns zero
- * with the lock held otherwise.
- */
- int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
- atomic_t *abort)
- {
- struct task_struct *task = ctx ? NULL : current;
- DECLARE_WAITQUEUE(wait, current);
- unsigned long flags;
- int stop;
- bool pm = false;
- might_sleep();
- add_wait_queue(&host->wq, &wait);
- spin_lock_irqsave(&host->lock, flags);
- while (1) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- stop = abort ? atomic_read(abort) : 0;
- if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
- break;
- spin_unlock_irqrestore(&host->lock, flags);
- schedule();
- spin_lock_irqsave(&host->lock, flags);
- }
- set_current_state(TASK_RUNNING);
- if (!stop) {
- host->claimed = 1;
- mmc_ctx_set_claimer(host, ctx, task);
- host->claim_cnt += 1;
- if (host->claim_cnt == 1)
- pm = true;
- } else
- wake_up(&host->wq);
- spin_unlock_irqrestore(&host->lock, flags);
- remove_wait_queue(&host->wq, &wait);
- if (pm)
- pm_runtime_get_sync(mmc_dev(host));
- return stop;
- }
- EXPORT_SYMBOL(__mmc_claim_host);
- /**
- * mmc_release_host - release a host
- * @host: mmc host to release
- *
- * Release a MMC host, allowing others to claim the host
- * for their operations.
- */
- void mmc_release_host(struct mmc_host *host)
- {
- unsigned long flags;
- WARN_ON(!host->claimed);
- spin_lock_irqsave(&host->lock, flags);
- if (--host->claim_cnt) {
- /* Release for nested claim */
- spin_unlock_irqrestore(&host->lock, flags);
- } else {
- host->claimed = 0;
- host->claimer->task = NULL;
- host->claimer = NULL;
- spin_unlock_irqrestore(&host->lock, flags);
- wake_up(&host->wq);
- pm_runtime_mark_last_busy(mmc_dev(host));
- if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
- pm_runtime_put_sync_suspend(mmc_dev(host));
- else
- pm_runtime_put_autosuspend(mmc_dev(host));
- }
- }
- EXPORT_SYMBOL(mmc_release_host);
- /*
- * This is a helper function, which fetches a runtime pm reference for the
- * card device and also claims the host.
- */
- void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
- {
- pm_runtime_get_sync(&card->dev);
- __mmc_claim_host(card->host, ctx, NULL);
- }
- EXPORT_SYMBOL(mmc_get_card);
- /*
- * This is a helper function, which releases the host and drops the runtime
- * pm reference for the card device.
- */
- void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
- {
- struct mmc_host *host = card->host;
- WARN_ON(ctx && host->claimer != ctx);
- mmc_release_host(host);
- pm_runtime_mark_last_busy(&card->dev);
- pm_runtime_put_autosuspend(&card->dev);
- }
- EXPORT_SYMBOL(mmc_put_card);
- /*
- * Internal function that does the actual ios call to the host driver,
- * optionally printing some debug output.
- */
- static inline void mmc_set_ios(struct mmc_host *host)
- {
- struct mmc_ios *ios = &host->ios;
- pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
- "width %u timing %u\n",
- mmc_hostname(host), ios->clock, ios->bus_mode,
- ios->power_mode, ios->chip_select, ios->vdd,
- 1 << ios->bus_width, ios->timing);
- host->ops->set_ios(host, ios);
- }
- /*
- * Control chip select pin on a host.
- */
- void mmc_set_chip_select(struct mmc_host *host, int mode)
- {
- host->ios.chip_select = mode;
- mmc_set_ios(host);
- }
- /*
- * Sets the host clock to the highest possible frequency that
- * is below "hz".
- */
- void mmc_set_clock(struct mmc_host *host, unsigned int hz)
- {
- WARN_ON(hz && hz < host->f_min);
- if (hz > host->f_max)
- hz = host->f_max;
- host->ios.clock = hz;
- mmc_set_ios(host);
- }
- EXPORT_SYMBOL_GPL(mmc_set_clock);
- int mmc_execute_tuning(struct mmc_card *card)
- {
- struct mmc_host *host = card->host;
- u32 opcode;
- int err;
- if (!host->ops->execute_tuning)
- return 0;
- if (host->cqe_on)
- host->cqe_ops->cqe_off(host);
- if (mmc_card_mmc(card))
- opcode = MMC_SEND_TUNING_BLOCK_HS200;
- else
- opcode = MMC_SEND_TUNING_BLOCK;
- err = host->ops->execute_tuning(host, opcode);
- if (err) {
- pr_err("%s: tuning execution failed: %d\n",
- mmc_hostname(host), err);
- } else {
- host->retune_now = 0;
- host->need_retune = 0;
- mmc_retune_enable(host);
- }
- return err;
- }
- /*
- * Change the bus mode (open drain/push-pull) of a host.
- */
- void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
- {
- host->ios.bus_mode = mode;
- mmc_set_ios(host);
- }
- /*
- * Change data bus width of a host.
- */
- void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
- {
- host->ios.bus_width = width;
- mmc_set_ios(host);
- }
- /*
- * Set initial state after a power cycle or a hw_reset.
- */
- void mmc_set_initial_state(struct mmc_host *host)
- {
- if (host->cqe_on)
- host->cqe_ops->cqe_off(host);
- mmc_retune_disable(host);
- if (mmc_host_is_spi(host))
- host->ios.chip_select = MMC_CS_HIGH;
- else
- host->ios.chip_select = MMC_CS_DONTCARE;
- host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
- host->ios.bus_width = MMC_BUS_WIDTH_1;
- host->ios.timing = MMC_TIMING_LEGACY;
- host->ios.drv_type = 0;
- host->ios.enhanced_strobe = false;
- /*
- * Make sure we are in non-enhanced strobe mode before we
- * actually enable it in ext_csd.
- */
- if ((host->caps2 & MMC_CAP2_HS400_ES) &&
- host->ops->hs400_enhanced_strobe)
- host->ops->hs400_enhanced_strobe(host, &host->ios);
- mmc_set_ios(host);
- mmc_crypto_set_initial_state(host);
- }
- EXPORT_SYMBOL_GPL(mmc_set_initial_state);
- /**
- * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
- * @vdd: voltage (mV)
- * @low_bits: prefer low bits in boundary cases
- *
- * This function returns the OCR bit number according to the provided @vdd
- * value. If conversion is not possible a negative errno value returned.
- *
- * Depending on the @low_bits flag the function prefers low or high OCR bits
- * on boundary voltages. For example,
- * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
- * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
- *
- * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
- */
- static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
- {
- const int max_bit = ilog2(MMC_VDD_35_36);
- int bit;
- if (vdd < 1650 || vdd > 3600)
- return -EINVAL;
- if (vdd >= 1650 && vdd <= 1950)
- return ilog2(MMC_VDD_165_195);
- if (low_bits)
- vdd -= 1;
- /* Base 2000 mV, step 100 mV, bit's base 8. */
- bit = (vdd - 2000) / 100 + 8;
- if (bit > max_bit)
- return max_bit;
- return bit;
- }
- /**
- * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
- * @vdd_min: minimum voltage value (mV)
- * @vdd_max: maximum voltage value (mV)
- *
- * This function returns the OCR mask bits according to the provided @vdd_min
- * and @vdd_max values. If conversion is not possible the function returns 0.
- *
- * Notes wrt boundary cases:
- * This function sets the OCR bits for all boundary voltages, for example
- * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
- * MMC_VDD_34_35 mask.
- */
- u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
- {
- u32 mask = 0;
- if (vdd_max < vdd_min)
- return 0;
- /* Prefer high bits for the boundary vdd_max values. */
- vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
- if (vdd_max < 0)
- return 0;
- /* Prefer low bits for the boundary vdd_min values. */
- vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
- if (vdd_min < 0)
- return 0;
- /* Fill the mask, from max bit to min bit. */
- while (vdd_max >= vdd_min)
- mask |= 1 << vdd_max--;
- return mask;
- }
- static int mmc_of_get_func_num(struct device_node *node)
- {
- u32 reg;
- int ret;
- ret = of_property_read_u32(node, "reg", ®);
- if (ret < 0)
- return ret;
- return reg;
- }
- struct device_node *mmc_of_find_child_device(struct mmc_host *host,
- unsigned func_num)
- {
- struct device_node *node;
- if (!host->parent || !host->parent->of_node)
- return NULL;
- for_each_child_of_node(host->parent->of_node, node) {
- if (mmc_of_get_func_num(node) == func_num)
- return node;
- }
- return NULL;
- }
- /*
- * Mask off any voltages we don't support and select
- * the lowest voltage
- */
- u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
- {
- int bit;
- /*
- * Sanity check the voltages that the card claims to
- * support.
- */
- if (ocr & 0x7F) {
- dev_warn(mmc_dev(host),
- "card claims to support voltages below defined range\n");
- ocr &= ~0x7F;
- }
- ocr &= host->ocr_avail;
- if (!ocr) {
- dev_warn(mmc_dev(host), "no support for card's volts\n");
- return 0;
- }
- if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
- bit = ffs(ocr) - 1;
- ocr &= 3 << bit;
- mmc_power_cycle(host, ocr);
- } else {
- bit = fls(ocr) - 1;
- ocr &= 3 << bit;
- if (bit != host->ios.vdd)
- dev_warn(mmc_dev(host), "exceeding card's volts\n");
- }
- return ocr;
- }
- int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
- {
- int err = 0;
- int old_signal_voltage = host->ios.signal_voltage;
- host->ios.signal_voltage = signal_voltage;
- if (host->ops->start_signal_voltage_switch)
- err = host->ops->start_signal_voltage_switch(host, &host->ios);
- if (err)
- host->ios.signal_voltage = old_signal_voltage;
- return err;
- }
- void mmc_set_initial_signal_voltage(struct mmc_host *host)
- {
- /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
- if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330))
- dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
- else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
- dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
- else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120))
- dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
- }
- int mmc_host_set_uhs_voltage(struct mmc_host *host)
- {
- u32 clock;
- /*
- * During a signal voltage level switch, the clock must be gated
- * for 5 ms according to the SD spec
- */
- clock = host->ios.clock;
- host->ios.clock = 0;
- mmc_set_ios(host);
- if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
- return -EAGAIN;
- /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
- mmc_delay(10);
- host->ios.clock = clock;
- mmc_set_ios(host);
- return 0;
- }
- int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
- {
- struct mmc_command cmd = {};
- int err = 0;
- /*
- * If we cannot switch voltages, return failure so the caller
- * can continue without UHS mode
- */
- if (!host->ops->start_signal_voltage_switch)
- return -EPERM;
- if (!host->ops->card_busy)
- pr_warn("%s: cannot verify signal voltage switch\n",
- mmc_hostname(host));
- cmd.opcode = SD_SWITCH_VOLTAGE;
- cmd.arg = 0;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
- err = mmc_wait_for_cmd(host, &cmd, 0);
- if (err)
- goto power_cycle;
- if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
- return -EIO;
- /*
- * The card should drive cmd and dat[0:3] low immediately
- * after the response of cmd11, but wait 1 ms to be sure
- */
- mmc_delay(1);
- if (host->ops->card_busy && !host->ops->card_busy(host)) {
- err = -EAGAIN;
- goto power_cycle;
- }
- if (mmc_host_set_uhs_voltage(host)) {
- /*
- * Voltages may not have been switched, but we've already
- * sent CMD11, so a power cycle is required anyway
- */
- err = -EAGAIN;
- goto power_cycle;
- }
- /* Wait for at least 1 ms according to spec */
- mmc_delay(1);
- /*
- * Failure to switch is indicated by the card holding
- * dat[0:3] low
- */
- if (host->ops->card_busy && host->ops->card_busy(host))
- err = -EAGAIN;
- power_cycle:
- if (err) {
- pr_debug("%s: Signal voltage switch failed, "
- "power cycling card\n", mmc_hostname(host));
- mmc_power_cycle(host, ocr);
- }
- return err;
- }
- /*
- * Select timing parameters for host.
- */
- void mmc_set_timing(struct mmc_host *host, unsigned int timing)
- {
- host->ios.timing = timing;
- mmc_set_ios(host);
- }
- EXPORT_SYMBOL_GPL(mmc_set_timing);
- /*
- * Select appropriate driver type for host.
- */
- void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
- {
- host->ios.drv_type = drv_type;
- mmc_set_ios(host);
- }
- int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
- int card_drv_type, int *drv_type)
- {
- struct mmc_host *host = card->host;
- int host_drv_type = SD_DRIVER_TYPE_B;
- *drv_type = 0;
- if (!host->ops->select_drive_strength)
- return 0;
- /* Use SD definition of driver strength for hosts */
- if (host->caps & MMC_CAP_DRIVER_TYPE_A)
- host_drv_type |= SD_DRIVER_TYPE_A;
- if (host->caps & MMC_CAP_DRIVER_TYPE_C)
- host_drv_type |= SD_DRIVER_TYPE_C;
- if (host->caps & MMC_CAP_DRIVER_TYPE_D)
- host_drv_type |= SD_DRIVER_TYPE_D;
- /*
- * The drive strength that the hardware can support
- * depends on the board design. Pass the appropriate
- * information and let the hardware specific code
- * return what is possible given the options
- */
- return host->ops->select_drive_strength(card, max_dtr,
- host_drv_type,
- card_drv_type,
- drv_type);
- }
- /*
- * Apply power to the MMC stack. This is a two-stage process.
- * First, we enable power to the card without the clock running.
- * We then wait a bit for the power to stabilise. Finally,
- * enable the bus drivers and clock to the card.
- *
- * We must _NOT_ enable the clock prior to power stablising.
- *
- * If a host does all the power sequencing itself, ignore the
- * initial MMC_POWER_UP stage.
- */
- void mmc_power_up(struct mmc_host *host, u32 ocr)
- {
- if (host->ios.power_mode == MMC_POWER_ON)
- return;
- mmc_pwrseq_pre_power_on(host);
- host->ios.vdd = fls(ocr) - 1;
- host->ios.power_mode = MMC_POWER_UP;
- /* Set initial state and call mmc_set_ios */
- mmc_set_initial_state(host);
- mmc_set_initial_signal_voltage(host);
- /*
- * This delay should be sufficient to allow the power supply
- * to reach the minimum voltage.
- */
- mmc_delay(host->ios.power_delay_ms);
- mmc_pwrseq_post_power_on(host);
- host->ios.clock = host->f_init;
- host->ios.power_mode = MMC_POWER_ON;
- mmc_set_ios(host);
- /*
- * This delay must be at least 74 clock sizes, or 1 ms, or the
- * time required to reach a stable voltage.
- */
- mmc_delay(host->ios.power_delay_ms);
- }
- void mmc_power_off(struct mmc_host *host)
- {
- if (host->ios.power_mode == MMC_POWER_OFF)
- return;
- mmc_pwrseq_power_off(host);
- host->ios.clock = 0;
- host->ios.vdd = 0;
- host->ios.power_mode = MMC_POWER_OFF;
- /* Set initial state and call mmc_set_ios */
- mmc_set_initial_state(host);
- /*
- * Some configurations, such as the 802.11 SDIO card in the OLPC
- * XO-1.5, require a short delay after poweroff before the card
- * can be successfully turned on again.
- */
- mmc_delay(1);
- }
- void mmc_power_cycle(struct mmc_host *host, u32 ocr)
- {
- mmc_power_off(host);
- /* Wait at least 1 ms according to SD spec */
- mmc_delay(1);
- mmc_power_up(host, ocr);
- }
- /*
- * Cleanup when the last reference to the bus operator is dropped.
- */
- static void __mmc_release_bus(struct mmc_host *host)
- {
- WARN_ON(!host->bus_dead);
- host->bus_ops = NULL;
- }
- /*
- * Increase reference count of bus operator
- */
- static inline void mmc_bus_get(struct mmc_host *host)
- {
- unsigned long flags;
- spin_lock_irqsave(&host->lock, flags);
- host->bus_refs++;
- spin_unlock_irqrestore(&host->lock, flags);
- }
- /*
- * Decrease reference count of bus operator and free it if
- * it is the last reference.
- */
- static inline void mmc_bus_put(struct mmc_host *host)
- {
- unsigned long flags;
- spin_lock_irqsave(&host->lock, flags);
- host->bus_refs--;
- if ((host->bus_refs == 0) && host->bus_ops)
- __mmc_release_bus(host);
- spin_unlock_irqrestore(&host->lock, flags);
- }
- /*
- * Assign a mmc bus handler to a host. Only one bus handler may control a
- * host at any given time.
- */
- void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
- {
- unsigned long flags;
- WARN_ON(!host->claimed);
- spin_lock_irqsave(&host->lock, flags);
- WARN_ON(host->bus_ops);
- WARN_ON(host->bus_refs);
- host->bus_ops = ops;
- host->bus_refs = 1;
- host->bus_dead = 0;
- spin_unlock_irqrestore(&host->lock, flags);
- }
- /*
- * Remove the current bus handler from a host.
- */
- void mmc_detach_bus(struct mmc_host *host)
- {
- unsigned long flags;
- WARN_ON(!host->claimed);
- WARN_ON(!host->bus_ops);
- spin_lock_irqsave(&host->lock, flags);
- host->bus_dead = 1;
- spin_unlock_irqrestore(&host->lock, flags);
- mmc_bus_put(host);
- }
- void _mmc_detect_change(struct mmc_host *host, unsigned long delay, bool cd_irq)
- {
- /*
- * Prevent system sleep for 5s to allow user space to consume the
- * corresponding uevent. This is especially useful, when CD irq is used
- * as a system wakeup, but doesn't hurt in other cases.
- */
- if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL))
- __pm_wakeup_event(host->ws, 5000);
- host->detect_change = 1;
- mmc_schedule_delayed_work(&host->detect, delay);
- }
- /**
- * mmc_detect_change - process change of state on a MMC socket
- * @host: host which changed state.
- * @delay: optional delay to wait before detection (jiffies)
- *
- * MMC drivers should call this when they detect a card has been
- * inserted or removed. The MMC layer will confirm that any
- * present card is still functional, and initialize any newly
- * inserted.
- */
- void mmc_detect_change(struct mmc_host *host, unsigned long delay)
- {
- _mmc_detect_change(host, delay, true);
- }
- EXPORT_SYMBOL(mmc_detect_change);
- void mmc_init_erase(struct mmc_card *card)
- {
- unsigned int sz;
- if (is_power_of_2(card->erase_size))
- card->erase_shift = ffs(card->erase_size) - 1;
- else
- card->erase_shift = 0;
- /*
- * It is possible to erase an arbitrarily large area of an SD or MMC
- * card. That is not desirable because it can take a long time
- * (minutes) potentially delaying more important I/O, and also the
- * timeout calculations become increasingly hugely over-estimated.
- * Consequently, 'pref_erase' is defined as a guide to limit erases
- * to that size and alignment.
- *
- * For SD cards that define Allocation Unit size, limit erases to one
- * Allocation Unit at a time.
- * For MMC, have a stab at ai good value and for modern cards it will
- * end up being 4MiB. Note that if the value is too small, it can end
- * up taking longer to erase. Also note, erase_size is already set to
- * High Capacity Erase Size if available when this function is called.
- */
- if (mmc_card_sd(card) && card->ssr.au) {
- card->pref_erase = card->ssr.au;
- card->erase_shift = ffs(card->ssr.au) - 1;
- } else if (card->erase_size) {
- sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
- if (sz < 128)
- card->pref_erase = 512 * 1024 / 512;
- else if (sz < 512)
- card->pref_erase = 1024 * 1024 / 512;
- else if (sz < 1024)
- card->pref_erase = 2 * 1024 * 1024 / 512;
- else
- card->pref_erase = 4 * 1024 * 1024 / 512;
- if (card->pref_erase < card->erase_size)
- card->pref_erase = card->erase_size;
- else {
- sz = card->pref_erase % card->erase_size;
- if (sz)
- card->pref_erase += card->erase_size - sz;
- }
- } else
- card->pref_erase = 0;
- }
- static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
- unsigned int arg, unsigned int qty)
- {
- unsigned int erase_timeout;
- if (arg == MMC_DISCARD_ARG ||
- (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
- erase_timeout = card->ext_csd.trim_timeout;
- } else if (card->ext_csd.erase_group_def & 1) {
- /* High Capacity Erase Group Size uses HC timeouts */
- if (arg == MMC_TRIM_ARG)
- erase_timeout = card->ext_csd.trim_timeout;
- else
- erase_timeout = card->ext_csd.hc_erase_timeout;
- } else {
- /* CSD Erase Group Size uses write timeout */
- unsigned int mult = (10 << card->csd.r2w_factor);
- unsigned int timeout_clks = card->csd.taac_clks * mult;
- unsigned int timeout_us;
- /* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */
- if (card->csd.taac_ns < 1000000)
- timeout_us = (card->csd.taac_ns * mult) / 1000;
- else
- timeout_us = (card->csd.taac_ns / 1000) * mult;
- /*
- * ios.clock is only a target. The real clock rate might be
- * less but not that much less, so fudge it by multiplying by 2.
- */
- timeout_clks <<= 1;
- timeout_us += (timeout_clks * 1000) /
- (card->host->ios.clock / 1000);
- erase_timeout = timeout_us / 1000;
- /*
- * Theoretically, the calculation could underflow so round up
- * to 1ms in that case.
- */
- if (!erase_timeout)
- erase_timeout = 1;
- }
- /* Multiplier for secure operations */
- if (arg & MMC_SECURE_ARGS) {
- if (arg == MMC_SECURE_ERASE_ARG)
- erase_timeout *= card->ext_csd.sec_erase_mult;
- else
- erase_timeout *= card->ext_csd.sec_trim_mult;
- }
- erase_timeout *= qty;
- /*
- * Ensure at least a 1 second timeout for SPI as per
- * 'mmc_set_data_timeout()'
- */
- if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
- erase_timeout = 1000;
- return erase_timeout;
- }
- static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
- unsigned int arg,
- unsigned int qty)
- {
- unsigned int erase_timeout;
- /* for DISCARD none of the below calculation applies.
- * the busy timeout is 250msec per discard command.
- */
- if (arg == SD_DISCARD_ARG)
- return SD_DISCARD_TIMEOUT_MS;
- if (card->ssr.erase_timeout) {
- /* Erase timeout specified in SD Status Register (SSR) */
- erase_timeout = card->ssr.erase_timeout * qty +
- card->ssr.erase_offset;
- } else {
- /*
- * Erase timeout not specified in SD Status Register (SSR) so
- * use 250ms per write block.
- */
- erase_timeout = 250 * qty;
- }
- /* Must not be less than 1 second */
- if (erase_timeout < 1000)
- erase_timeout = 1000;
- return erase_timeout;
- }
- static unsigned int mmc_erase_timeout(struct mmc_card *card,
- unsigned int arg,
- unsigned int qty)
- {
- if (mmc_card_sd(card))
- return mmc_sd_erase_timeout(card, arg, qty);
- else
- return mmc_mmc_erase_timeout(card, arg, qty);
- }
- static int mmc_do_erase(struct mmc_card *card, unsigned int from,
- unsigned int to, unsigned int arg)
- {
- struct mmc_command cmd = {};
- unsigned int qty = 0, busy_timeout = 0;
- bool use_r1b_resp = false;
- int err;
- mmc_retune_hold(card->host);
- /*
- * qty is used to calculate the erase timeout which depends on how many
- * erase groups (or allocation units in SD terminology) are affected.
- * We count erasing part of an erase group as one erase group.
- * For SD, the allocation units are always a power of 2. For MMC, the
- * erase group size is almost certainly also power of 2, but it does not
- * seem to insist on that in the JEDEC standard, so we fall back to
- * division in that case. SD may not specify an allocation unit size,
- * in which case the timeout is based on the number of write blocks.
- *
- * Note that the timeout for secure trim 2 will only be correct if the
- * number of erase groups specified is the same as the total of all
- * preceding secure trim 1 commands. Since the power may have been
- * lost since the secure trim 1 commands occurred, it is generally
- * impossible to calculate the secure trim 2 timeout correctly.
- */
- if (card->erase_shift)
- qty += ((to >> card->erase_shift) -
- (from >> card->erase_shift)) + 1;
- else if (mmc_card_sd(card))
- qty += to - from + 1;
- else
- qty += ((to / card->erase_size) -
- (from / card->erase_size)) + 1;
- if (!mmc_card_blockaddr(card)) {
- from <<= 9;
- to <<= 9;
- }
- if (mmc_card_sd(card))
- cmd.opcode = SD_ERASE_WR_BLK_START;
- else
- cmd.opcode = MMC_ERASE_GROUP_START;
- cmd.arg = from;
- cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
- err = mmc_wait_for_cmd(card->host, &cmd, 0);
- if (err) {
- pr_err("mmc_erase: group start error %d, "
- "status %#x\n", err, cmd.resp[0]);
- err = -EIO;
- goto out;
- }
- memset(&cmd, 0, sizeof(struct mmc_command));
- if (mmc_card_sd(card))
- cmd.opcode = SD_ERASE_WR_BLK_END;
- else
- cmd.opcode = MMC_ERASE_GROUP_END;
- cmd.arg = to;
- cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
- err = mmc_wait_for_cmd(card->host, &cmd, 0);
- if (err) {
- pr_err("mmc_erase: group end error %d, status %#x\n",
- err, cmd.resp[0]);
- err = -EIO;
- goto out;
- }
- memset(&cmd, 0, sizeof(struct mmc_command));
- cmd.opcode = MMC_ERASE;
- cmd.arg = arg;
- busy_timeout = mmc_erase_timeout(card, arg, qty);
- /*
- * If the host controller supports busy signalling and the timeout for
- * the erase operation does not exceed the max_busy_timeout, we should
- * use R1B response. Or we need to prevent the host from doing hw busy
- * detection, which is done by converting to a R1 response instead.
- * Note, some hosts requires R1B, which also means they are on their own
- * when it comes to deal with the busy timeout.
- */
- if (!(card->host->caps & MMC_CAP_NEED_RSP_BUSY) &&
- card->host->max_busy_timeout &&
- busy_timeout > card->host->max_busy_timeout) {
- cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
- } else {
- cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
- cmd.busy_timeout = busy_timeout;
- use_r1b_resp = true;
- }
- err = mmc_wait_for_cmd(card->host, &cmd, 0);
- if (err) {
- pr_err("mmc_erase: erase error %d, status %#x\n",
- err, cmd.resp[0]);
- err = -EIO;
- goto out;
- }
- if (mmc_host_is_spi(card->host))
- goto out;
- /*
- * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
- * shall be avoided.
- */
- if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
- goto out;
- /* Let's poll to find out when the erase operation completes. */
- err = mmc_poll_for_busy(card, busy_timeout, MMC_BUSY_ERASE);
- out:
- mmc_retune_release(card->host);
- return err;
- }
- static unsigned int mmc_align_erase_size(struct mmc_card *card,
- unsigned int *from,
- unsigned int *to,
- unsigned int nr)
- {
- unsigned int from_new = *from, nr_new = nr, rem;
- /*
- * When the 'card->erase_size' is power of 2, we can use round_up/down()
- * to align the erase size efficiently.
- */
- if (is_power_of_2(card->erase_size)) {
- unsigned int temp = from_new;
- from_new = round_up(temp, card->erase_size);
- rem = from_new - temp;
- if (nr_new > rem)
- nr_new -= rem;
- else
- return 0;
- nr_new = round_down(nr_new, card->erase_size);
- } else {
- rem = from_new % card->erase_size;
- if (rem) {
- rem = card->erase_size - rem;
- from_new += rem;
- if (nr_new > rem)
- nr_new -= rem;
- else
- return 0;
- }
- rem = nr_new % card->erase_size;
- if (rem)
- nr_new -= rem;
- }
- if (nr_new == 0)
- return 0;
- *to = from_new + nr_new;
- *from = from_new;
- return nr_new;
- }
- /**
- * mmc_erase - erase sectors.
- * @card: card to erase
- * @from: first sector to erase
- * @nr: number of sectors to erase
- * @arg: erase command argument
- *
- * Caller must claim host before calling this function.
- */
- int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
- unsigned int arg)
- {
- unsigned int rem, to = from + nr;
- int err;
- if (!(card->csd.cmdclass & CCC_ERASE))
- return -EOPNOTSUPP;
- if (!card->erase_size)
- return -EOPNOTSUPP;
- if (mmc_card_sd(card) && arg != SD_ERASE_ARG && arg != SD_DISCARD_ARG)
- return -EOPNOTSUPP;
- if (mmc_card_mmc(card) && (arg & MMC_SECURE_ARGS) &&
- !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
- return -EOPNOTSUPP;
- if (mmc_card_mmc(card) && (arg & MMC_TRIM_ARGS) &&
- !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
- return -EOPNOTSUPP;
- if (arg == MMC_SECURE_ERASE_ARG) {
- if (from % card->erase_size || nr % card->erase_size)
- return -EINVAL;
- }
- if (arg == MMC_ERASE_ARG)
- nr = mmc_align_erase_size(card, &from, &to, nr);
- if (nr == 0)
- return 0;
- if (to <= from)
- return -EINVAL;
- /* 'from' and 'to' are inclusive */
- to -= 1;
- /*
- * Special case where only one erase-group fits in the timeout budget:
- * If the region crosses an erase-group boundary on this particular
- * case, we will be trimming more than one erase-group which, does not
- * fit in the timeout budget of the controller, so we need to split it
- * and call mmc_do_erase() twice if necessary. This special case is
- * identified by the card->eg_boundary flag.
- */
- rem = card->erase_size - (from % card->erase_size);
- if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
- err = mmc_do_erase(card, from, from + rem - 1, arg);
- from += rem;
- if ((err) || (to <= from))
- return err;
- }
- return mmc_do_erase(card, from, to, arg);
- }
- EXPORT_SYMBOL(mmc_erase);
- int mmc_can_erase(struct mmc_card *card)
- {
- if (card->csd.cmdclass & CCC_ERASE && card->erase_size)
- return 1;
- return 0;
- }
- EXPORT_SYMBOL(mmc_can_erase);
- int mmc_can_trim(struct mmc_card *card)
- {
- if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
- (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
- return 1;
- return 0;
- }
- EXPORT_SYMBOL(mmc_can_trim);
- int mmc_can_discard(struct mmc_card *card)
- {
- /*
- * As there's no way to detect the discard support bit at v4.5
- * use the s/w feature support filed.
- */
- if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
- return 1;
- return 0;
- }
- EXPORT_SYMBOL(mmc_can_discard);
- int mmc_can_sanitize(struct mmc_card *card)
- {
- if (!mmc_can_trim(card) && !mmc_can_erase(card))
- return 0;
- if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
- return 1;
- return 0;
- }
- int mmc_can_secure_erase_trim(struct mmc_card *card)
- {
- if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
- !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
- return 1;
- return 0;
- }
- EXPORT_SYMBOL(mmc_can_secure_erase_trim);
- int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
- unsigned int nr)
- {
- if (!card->erase_size)
- return 0;
- if (from % card->erase_size || nr % card->erase_size)
- return 0;
- return 1;
- }
- EXPORT_SYMBOL(mmc_erase_group_aligned);
- static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
- unsigned int arg)
- {
- struct mmc_host *host = card->host;
- unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
- unsigned int last_timeout = 0;
- unsigned int max_busy_timeout = host->max_busy_timeout ?
- host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
- if (card->erase_shift) {
- max_qty = UINT_MAX >> card->erase_shift;
- min_qty = card->pref_erase >> card->erase_shift;
- } else if (mmc_card_sd(card)) {
- max_qty = UINT_MAX;
- min_qty = card->pref_erase;
- } else {
- max_qty = UINT_MAX / card->erase_size;
- min_qty = card->pref_erase / card->erase_size;
- }
- /*
- * We should not only use 'host->max_busy_timeout' as the limitation
- * when deciding the max discard sectors. We should set a balance value
- * to improve the erase speed, and it can not get too long timeout at
- * the same time.
- *
- * Here we set 'card->pref_erase' as the minimal discard sectors no
- * matter what size of 'host->max_busy_timeout', but if the
- * 'host->max_busy_timeout' is large enough for more discard sectors,
- * then we can continue to increase the max discard sectors until we
- * get a balance value. In cases when the 'host->max_busy_timeout'
- * isn't specified, use the default max erase timeout.
- */
- do {
- y = 0;
- for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
- timeout = mmc_erase_timeout(card, arg, qty + x);
- if (qty + x > min_qty && timeout > max_busy_timeout)
- break;
- if (timeout < last_timeout)
- break;
- last_timeout = timeout;
- y = x;
- }
- qty += y;
- } while (y);
- if (!qty)
- return 0;
- /*
- * When specifying a sector range to trim, chances are we might cross
- * an erase-group boundary even if the amount of sectors is less than
- * one erase-group.
- * If we can only fit one erase-group in the controller timeout budget,
- * we have to care that erase-group boundaries are not crossed by a
- * single trim operation. We flag that special case with "eg_boundary".
- * In all other cases we can just decrement qty and pretend that we
- * always touch (qty + 1) erase-groups as a simple optimization.
- */
- if (qty == 1)
- card->eg_boundary = 1;
- else
- qty--;
- /* Convert qty to sectors */
- if (card->erase_shift)
- max_discard = qty << card->erase_shift;
- else if (mmc_card_sd(card))
- max_discard = qty + 1;
- else
- max_discard = qty * card->erase_size;
- return max_discard;
- }
- unsigned int mmc_calc_max_discard(struct mmc_card *card)
- {
- struct mmc_host *host = card->host;
- unsigned int max_discard, max_trim;
- /*
- * Without erase_group_def set, MMC erase timeout depends on clock
- * frequence which can change. In that case, the best choice is
- * just the preferred erase size.
- */
- if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
- return card->pref_erase;
- max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
- if (mmc_can_trim(card)) {
- max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
- if (max_trim < max_discard || max_discard == 0)
- max_discard = max_trim;
- } else if (max_discard < card->erase_size) {
- max_discard = 0;
- }
- pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
- mmc_hostname(host), max_discard, host->max_busy_timeout ?
- host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
- return max_discard;
- }
- EXPORT_SYMBOL(mmc_calc_max_discard);
- bool mmc_card_is_blockaddr(struct mmc_card *card)
- {
- return card ? mmc_card_blockaddr(card) : false;
- }
- EXPORT_SYMBOL(mmc_card_is_blockaddr);
- int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
- {
- struct mmc_command cmd = {};
- if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
- mmc_card_hs400(card) || mmc_card_hs400es(card))
- return 0;
- cmd.opcode = MMC_SET_BLOCKLEN;
- cmd.arg = blocklen;
- cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
- return mmc_wait_for_cmd(card->host, &cmd, 5);
- }
- EXPORT_SYMBOL(mmc_set_blocklen);
- static void mmc_hw_reset_for_init(struct mmc_host *host)
- {
- mmc_pwrseq_reset(host);
- if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
- return;
- host->ops->hw_reset(host);
- }
- /**
- * mmc_hw_reset - reset the card in hardware
- * @host: MMC host to which the card is attached
- *
- * Hard reset the card. This function is only for upper layers, like the
- * block layer or card drivers. You cannot use it in host drivers (struct
- * mmc_card might be gone then).
- *
- * Return: 0 on success, -errno on failure
- */
- int mmc_hw_reset(struct mmc_host *host)
- {
- int ret;
- if (!host->card)
- return -EINVAL;
- mmc_bus_get(host);
- if (!host->bus_ops || host->bus_dead || !host->bus_ops->hw_reset) {
- mmc_bus_put(host);
- return -EOPNOTSUPP;
- }
- ret = host->bus_ops->hw_reset(host);
- mmc_bus_put(host);
- if (ret < 0)
- pr_warn("%s: tried to HW reset card, got error %d\n",
- mmc_hostname(host), ret);
- return ret;
- }
- EXPORT_SYMBOL(mmc_hw_reset);
- int mmc_sw_reset(struct mmc_host *host)
- {
- int ret;
- if (!host->card)
- return -EINVAL;
- mmc_bus_get(host);
- if (!host->bus_ops || host->bus_dead || !host->bus_ops->sw_reset) {
- mmc_bus_put(host);
- return -EOPNOTSUPP;
- }
- ret = host->bus_ops->sw_reset(host);
- mmc_bus_put(host);
- if (ret)
- pr_warn("%s: tried to SW reset card, got error %d\n",
- mmc_hostname(host), ret);
- return ret;
- }
- EXPORT_SYMBOL(mmc_sw_reset);
- static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
- {
- host->f_init = freq;
- pr_debug("%s: %s: trying to init card at %u Hz\n",
- mmc_hostname(host), __func__, host->f_init);
- mmc_power_up(host, host->ocr_avail);
- /*
- * Some eMMCs (with VCCQ always on) may not be reset after power up, so
- * do a hardware reset if possible.
- */
- mmc_hw_reset_for_init(host);
- /*
- * sdio_reset sends CMD52 to reset card. Since we do not know
- * if the card is being re-initialized, just send it. CMD52
- * should be ignored by SD/eMMC cards.
- * Skip it if we already know that we do not support SDIO commands
- */
- if (!(host->caps2 & MMC_CAP2_NO_SDIO))
- sdio_reset(host);
- mmc_go_idle(host);
- if (!(host->caps2 & MMC_CAP2_NO_SD))
- mmc_send_if_cond(host, host->ocr_avail);
- /* Order's important: probe SDIO, then SD, then MMC */
- if (!(host->caps2 & MMC_CAP2_NO_SDIO))
- if (!mmc_attach_sdio(host))
- return 0;
- if (!(host->caps2 & MMC_CAP2_NO_SD))
- if (!mmc_attach_sd(host))
- return 0;
- if (!(host->caps2 & MMC_CAP2_NO_MMC))
- if (!mmc_attach_mmc(host))
- return 0;
- mmc_power_off(host);
- return -EIO;
- }
- int _mmc_detect_card_removed(struct mmc_host *host)
- {
- int ret;
- if (!host->card || mmc_card_removed(host->card))
- return 1;
- ret = host->bus_ops->alive(host);
- /*
- * Card detect status and alive check may be out of sync if card is
- * removed slowly, when card detect switch changes while card/slot
- * pads are still contacted in hardware (refer to "SD Card Mechanical
- * Addendum, Appendix C: Card Detection Switch"). So reschedule a
- * detect work 200ms later for this case.
- */
- if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
- mmc_detect_change(host, msecs_to_jiffies(200));
- pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
- }
- if (ret) {
- mmc_card_set_removed(host->card);
- pr_debug("%s: card remove detected\n", mmc_hostname(host));
- }
- return ret;
- }
- int mmc_detect_card_removed(struct mmc_host *host)
- {
- struct mmc_card *card = host->card;
- int ret;
- WARN_ON(!host->claimed);
- if (!card)
- return 1;
- if (!mmc_card_is_removable(host))
- return 0;
- ret = mmc_card_removed(card);
- /*
- * The card will be considered unchanged unless we have been asked to
- * detect a change or host requires polling to provide card detection.
- */
- if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
- return ret;
- host->detect_change = 0;
- if (!ret) {
- ret = _mmc_detect_card_removed(host);
- if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
- /*
- * Schedule a detect work as soon as possible to let a
- * rescan handle the card removal.
- */
- cancel_delayed_work(&host->detect);
- _mmc_detect_change(host, 0, false);
- }
- }
- return ret;
- }
- EXPORT_SYMBOL(mmc_detect_card_removed);
- void mmc_rescan(struct work_struct *work)
- {
- struct mmc_host *host =
- container_of(work, struct mmc_host, detect.work);
- int i;
- if (host->rescan_disable)
- return;
- /* If there is a non-removable card registered, only scan once */
- if (!mmc_card_is_removable(host) && host->rescan_entered)
- return;
- host->rescan_entered = 1;
- if (host->trigger_card_event && host->ops->card_event) {
- mmc_claim_host(host);
- host->ops->card_event(host);
- mmc_release_host(host);
- host->trigger_card_event = false;
- }
- mmc_bus_get(host);
- /* Verify a registered card to be functional, else remove it. */
- if (host->bus_ops && !host->bus_dead)
- host->bus_ops->detect(host);
- host->detect_change = 0;
- /*
- * Let mmc_bus_put() free the bus/bus_ops if we've found that
- * the card is no longer present.
- */
- mmc_bus_put(host);
- mmc_bus_get(host);
- /* if there still is a card present, stop here */
- if (host->bus_ops != NULL) {
- mmc_bus_put(host);
- goto out;
- }
- /*
- * Only we can add a new handler, so it's safe to
- * release the lock here.
- */
- mmc_bus_put(host);
- mmc_claim_host(host);
- if (mmc_card_is_removable(host) && host->ops->get_cd &&
- host->ops->get_cd(host) == 0) {
- mmc_power_off(host);
- mmc_release_host(host);
- goto out;
- }
- for (i = 0; i < ARRAY_SIZE(freqs); i++) {
- unsigned int freq = freqs[i];
- if (freq > host->f_max) {
- if (i + 1 < ARRAY_SIZE(freqs))
- continue;
- freq = host->f_max;
- }
- if (!mmc_rescan_try_freq(host, max(freq, host->f_min)))
- break;
- if (freqs[i] <= host->f_min)
- break;
- }
- mmc_release_host(host);
- out:
- if (host->caps & MMC_CAP_NEEDS_POLL)
- mmc_schedule_delayed_work(&host->detect, HZ);
- }
- void mmc_start_host(struct mmc_host *host)
- {
- host->f_init = max(min(freqs[0], host->f_max), host->f_min);
- host->rescan_disable = 0;
- if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
- mmc_claim_host(host);
- mmc_power_up(host, host->ocr_avail);
- mmc_release_host(host);
- }
- mmc_gpiod_request_cd_irq(host);
- _mmc_detect_change(host, 0, false);
- }
- void __mmc_stop_host(struct mmc_host *host)
- {
- if (host->slot.cd_irq >= 0) {
- mmc_gpio_set_cd_wake(host, false);
- disable_irq(host->slot.cd_irq);
- }
- host->rescan_disable = 1;
- cancel_delayed_work_sync(&host->detect);
- }
- void mmc_stop_host(struct mmc_host *host)
- {
- __mmc_stop_host(host);
- /* clear pm flags now and let card drivers set them as needed */
- host->pm_flags = 0;
- mmc_bus_get(host);
- if (host->bus_ops && !host->bus_dead) {
- /* Calling bus_ops->remove() with a claimed host can deadlock */
- host->bus_ops->remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_power_off(host);
- mmc_release_host(host);
- mmc_bus_put(host);
- return;
- }
- mmc_bus_put(host);
- mmc_claim_host(host);
- mmc_power_off(host);
- mmc_release_host(host);
- }
- static int __init mmc_init(void)
- {
- int ret;
- ret = mmc_register_bus();
- if (ret)
- return ret;
- ret = mmc_register_host_class();
- if (ret)
- goto unregister_bus;
- ret = sdio_register_bus();
- if (ret)
- goto unregister_host_class;
- return 0;
- unregister_host_class:
- mmc_unregister_host_class();
- unregister_bus:
- mmc_unregister_bus();
- return ret;
- }
- static void __exit mmc_exit(void)
- {
- sdio_unregister_bus();
- mmc_unregister_host_class();
- mmc_unregister_bus();
- }
- subsys_initcall(mmc_init);
- module_exit(mmc_exit);
- MODULE_LICENSE("GPL");
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