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core.c
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core.c
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/*
* 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.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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/regulator/consumer.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 "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 */
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 host has timed out waiting for the sanitize
* to complete, card might be still in programming state
* so let's try to bring the card out of programming
* state.
*/
if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
if (!mmc_interrupt_hpi(host->card)) {
pr_warn("%s: %s: Interrupted sanitize\n",
mmc_hostname(host), __func__);
cmd->error = 0;
break;
} else {
pr_err("%s: %s: Failed to interrupt sanitize\n",
mmc_hostname(host), __func__);
}
}
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, MMC_CMD_RETRIES);
mmc_poll_for_busy(host->card, MMC_CQE_RECOVERY_TIMEOUT, true, true);
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, MMC_CMD_RETRIES);
host->cqe_ops->cqe_recovery_finish(host);
if (err)
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
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);
/**
* mmc_align_data_size - pads a transfer size to a more optimal value
* @card: the MMC card associated with the data transfer
* @sz: original transfer size
*
* Pads the original data size with a number of extra bytes in
* order to avoid controller bugs and/or performance hits
* (e.g. some controllers revert to PIO for certain sizes).
*
* Returns the improved size, which might be unmodified.
*
* Note that this function is only relevant when issuing a
* single scatter gather entry.
*/
unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
{
/*
* FIXME: We don't have a system for the controller to tell
* the core about its problems yet, so for now we just 32-bit
* align the size.
*/
sz = ((sz + 3) / 4) * 4;
return sz;
}
EXPORT_SYMBOL(mmc_align_data_size);
/*
* 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));
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);
}
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;
}
/*