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android_kernel_samsung_msm8976/drivers/mmc/core/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/suspend.h>
#include <linux/fault-inject.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/wakelock.h>
#include <linux/pm.h>
#include <linux/jiffies.h>
#include <trace/events/mmc.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include "core.h"
#include "bus.h"
#include "host.h"
#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
#include "sdio_ops.h"
#ifdef CONFIG_MMC_SUPPORT_STLOG
#include <linux/stlog.h>
#else
#define ST_LOG(fmt,...)
#endif
/* If the device is not responding */
#define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
/*
* Background operations can take a long time, depending on the housekeeping
* operations the card has to perform.
*/
#define MMC_BKOPS_MAX_TIMEOUT (30 * 1000) /* max time to wait in ms */
/* Flushing a large amount of cached data may take a long time. */
#define MMC_FLUSH_REQ_TIMEOUT_MS 180000 /* msec */
static struct workqueue_struct *workqueue;
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);
/*
* We normally treat cards as removed during suspend if they are not
* known to be on a non-removable bus, to avoid the risk of writing
* back data to a different card after resume. Allow this to be
* overridden if necessary.
*/
#ifdef CONFIG_MMC_UNSAFE_RESUME
bool mmc_assume_removable;
#else
bool mmc_assume_removable = 1;
#endif
EXPORT_SYMBOL(mmc_assume_removable);
module_param_named(removable, mmc_assume_removable, bool, 0644);
MODULE_PARM_DESC(
removable,
"MMC/SD cards are removable and may be removed during suspend");
#define MMC_UPDATE_BKOPS_STATS_HPI(stats) \
do { \
spin_lock(&stats.lock); \
if (stats.enabled) \
stats.hpi++; \
spin_unlock(&stats.lock); \
} while (0);
#define MMC_UPDATE_BKOPS_STATS_SUSPEND(stats) \
do { \
spin_lock(&stats.lock); \
if (stats.enabled) \
stats.suspend++; \
spin_unlock(&stats.lock); \
} while (0);
#define MMC_UPDATE_STATS_BKOPS_SEVERITY_LEVEL(stats, level) \
do { \
if (level <= 0 || level > BKOPS_NUM_OF_SEVERITY_LEVELS) \
break; \
spin_lock(&stats.lock); \
if (stats.enabled) \
stats.bkops_level[level-1]++; \
spin_unlock(&stats.lock); \
} while (0);
/*
* Internal function. Schedule delayed work in the MMC work queue.
*/
static int mmc_schedule_delayed_work(struct delayed_work *work,
unsigned long delay)
{
return queue_delayed_work(workqueue, work, delay);
}
/*
* Internal function. Flush all scheduled work from the MMC work queue.
*/
static void mmc_flush_scheduled_work(void)
{
flush_workqueue(workqueue);
}
#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->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;
data->fault_injected = true;
}
#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_clk_scaling_update_state(struct mmc_host *host, struct mmc_request *mrq)
{
if (mrq) {
switch (mrq->cmd->opcode) {
case MMC_READ_SINGLE_BLOCK:
case MMC_READ_MULTIPLE_BLOCK:
case MMC_WRITE_BLOCK:
case MMC_WRITE_MULTIPLE_BLOCK:
host->clk_scaling.invalid_state = false;
break;
default:
host->clk_scaling.invalid_state = true;
break;
}
} else {
/*
* force clock scaling transitions,
* if other conditions are met
*/
host->clk_scaling.invalid_state = false;
}
return;
}
void mmc_update_clk_scaling(struct mmc_host *host,
bool is_cmdq_dcmd)
{
bool cmdq_mode = !!mmc_card_cmdq(host->card);
if (!host->clk_scaling.enable || host->clk_scaling.invalid_state)
return;
/*
* For CQ mode: In completion of DCMD request, start busy time in
* case of pending data requests
*/
if (is_cmdq_dcmd) {
if (host->cmdq_ctx.data_active_reqs) {
host->clk_scaling.cq_is_busy_started = true;
host->clk_scaling.start_busy = ktime_get();
}
return;
}
host->clk_scaling.busy_time_us +=
ktime_to_us(ktime_sub(ktime_get(),
host->clk_scaling.start_busy));
if ((!cmdq_mode) || (cmdq_mode && host->cmdq_ctx.data_active_reqs)) {
host->clk_scaling.cq_is_busy_started = true;
host->clk_scaling.start_busy = ktime_get();
} else {
host->clk_scaling.cq_is_busy_started = false;
}
}
EXPORT_SYMBOL(mmc_update_clk_scaling);
/**
* 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;
#ifdef CONFIG_MMC_PERF_PROFILING
ktime_t diff;
#endif
if (host->card)
mmc_update_clk_scaling(host, false);
if (err && cmd->retries && mmc_host_is_spi(host)) {
if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
cmd->retries = 0;
}
if (err && cmd->retries && !mmc_card_removed(host->card)) {
/*
* Request starter must handle retries - see
* mmc_wait_for_req_done().
*/
if (mrq->done)
mrq->done(mrq);
} else {
mmc_should_fail_request(host, mrq);
led_trigger_event(host->led, LED_OFF);
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) {
#ifdef CONFIG_MMC_PERF_PROFILING
if (host->perf_enable) {
diff = ktime_sub(ktime_get(), host->perf.start);
if (mrq->data->flags == MMC_DATA_READ) {
host->perf.rbytes_drv +=
mrq->data->bytes_xfered;
host->perf.rtime_drv =
ktime_add(host->perf.rtime_drv,
diff);
} else {
host->perf.wbytes_drv +=
mrq->data->bytes_xfered;
host->perf.wtime_drv =
ktime_add(host->perf.wtime_drv,
diff);
}
}
#endif
pr_debug("%s: %d bytes transferred: %d\n",
mmc_hostname(host),
mrq->data->bytes_xfered, mrq->data->error);
trace_mmc_blk_rw_end(cmd->opcode, cmd->arg, mrq->data);
}
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]);
}
if (mrq->done)
mrq->done(mrq);
mmc_host_clk_release(host);
}
}
EXPORT_SYMBOL(mmc_request_done);
static void
mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
{
#ifdef CONFIG_MMC_DEBUG
unsigned int i, sz;
struct scatterlist *sg;
#endif
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);
}
pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
mmc_hostname(host), mrq->cmd->opcode,
mrq->cmd->arg, mrq->cmd->flags);
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);
}
WARN_ON(!host->claimed);
mrq->cmd->error = 0;
mrq->cmd->mrq = mrq;
if (mrq->data) {
BUG_ON(mrq->data->blksz > host->max_blk_size);
BUG_ON(mrq->data->blocks > host->max_blk_count);
BUG_ON(mrq->data->blocks * mrq->data->blksz >
host->max_req_size);
#ifdef CONFIG_MMC_DEBUG
sz = 0;
for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
sz += sg->length;
BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
#endif
mrq->cmd->data = mrq->data;
mrq->data->error = 0;
mrq->data->mrq = mrq;
if (mrq->stop) {
mrq->data->stop = mrq->stop;
mrq->stop->error = 0;
mrq->stop->mrq = mrq;
}
#ifdef CONFIG_MMC_PERF_PROFILING
if (host->perf_enable)
host->perf.start = ktime_get();
#endif
}
mmc_host_clk_hold(host);
led_trigger_event(host->led, LED_FULL);
if (host->card && host->clk_scaling.enable) {
/*
* Check if we need to scale the clocks. Clocks
* will be scaled up immediately if necessary
* conditions are satisfied. Scaling down the
* frequency will be done after current thread
* releases host.
*/
mmc_clk_scaling_update_state(host, mrq);
if (!host->clk_scaling.invalid_state) {
mmc_clk_scaling(host, false);
host->clk_scaling.start_busy = ktime_get();
}
}
host->ops->request(host, mrq);
}
void mmc_blk_init_bkops_statistics(struct mmc_card *card)
{
int i;
struct mmc_bkops_stats *bkops_stats;
if (!card)
return;
bkops_stats = &card->bkops_info.bkops_stats;
spin_lock(&bkops_stats->lock);
for (i = 0 ; i < BKOPS_NUM_OF_SEVERITY_LEVELS ; ++i)
bkops_stats->bkops_level[i] = 0;
bkops_stats->suspend = 0;
bkops_stats->hpi = 0;
bkops_stats->enabled = true;
spin_unlock(&bkops_stats->lock);
}
EXPORT_SYMBOL(mmc_blk_init_bkops_statistics);
static void mmc_start_cmdq_request(struct mmc_host *host,
struct mmc_request *mrq)
{
if (mrq->data) {
pr_debug("%s: blksz %d blocks %d flags %08x tsac %lu ms nsac %d\n",
mmc_hostname(host), mrq->data->blksz,
mrq->data->blocks, mrq->data->flags,
mrq->data->timeout_ns / NSEC_PER_MSEC,
mrq->data->timeout_clks);
BUG_ON(mrq->data->blksz > host->max_blk_size);
BUG_ON(mrq->data->blocks > host->max_blk_count);
BUG_ON(mrq->data->blocks * mrq->data->blksz >
host->max_req_size);
mrq->data->error = 0;
mrq->data->mrq = mrq;
}
if (mrq->cmd) {
mrq->cmd->error = 0;
mrq->cmd->mrq = mrq;
}
mmc_host_clk_hold(host);
if (likely(host->cmdq_ops->request))
host->cmdq_ops->request(host, mrq);
else
pr_err("%s: %s: issue request failed\n", mmc_hostname(host),
__func__);
}
/**
* mmc_start_delayed_bkops() - Start a delayed work to check for
* the need of non urgent BKOPS
*
* @card: MMC card to start BKOPS on
*/
void mmc_start_delayed_bkops(struct mmc_card *card)
{
if (!card ||
!(mmc_card_get_bkops_en_manual(card)) ||
mmc_card_doing_bkops(card))
return;
if (card->bkops_info.sectors_changed <
card->bkops_info.min_sectors_to_queue_delayed_work)
return;
pr_debug("%s: %s: queueing delayed_bkops_work\n",
mmc_hostname(card->host), __func__);
/*
* cancel_delayed_bkops_work will prevent a race condition between
* fetching a request by the mmcqd and the delayed work, in case
* it was removed from the queue work but not started yet
*/
card->bkops_info.cancel_delayed_work = false;
queue_delayed_work(system_nrt_wq, &card->bkops_info.dw,
msecs_to_jiffies(
card->bkops_info.delay_ms));
}
EXPORT_SYMBOL(mmc_start_delayed_bkops);
/**
* mmc_start_bkops - start BKOPS for supported cards
* @card: MMC card to start BKOPS
* @from_exception: A flag to indicate if this function was
* called due to an exception raised by the card
*
* Start background operations whenever requested.
* When the urgent BKOPS bit is set in a R1 command response
* then background operations should be started immediately.
*/
void mmc_start_bkops(struct mmc_card *card, bool from_exception)
{
int err;
BUG_ON(!card);
if (!(mmc_card_get_bkops_en_manual(card)))
return;
if ((card->bkops_info.cancel_delayed_work) && !from_exception) {
pr_debug("%s: %s: cancel_delayed_work was set, exit\n",
mmc_hostname(card->host), __func__);
card->bkops_info.cancel_delayed_work = false;
return;
}
mmc_rpm_hold(card->host, &card->dev);
/* In case of delayed bkops we might be in race with suspend. */
if (!mmc_try_claim_host(card->host)) {
mmc_rpm_release(card->host, &card->dev);
return;
}
/*
* Since the cancel_delayed_work can be changed while we are waiting
* for the lock we will to re-check it
*/
if ((card->bkops_info.cancel_delayed_work) && !from_exception) {
pr_debug("%s: %s: cancel_delayed_work was set, exit\n",
mmc_hostname(card->host), __func__);
card->bkops_info.cancel_delayed_work = false;
goto out;
}
if (mmc_card_doing_bkops(card)) {
pr_debug("%s: %s: already doing bkops, exit\n",
mmc_hostname(card->host), __func__);
goto out;
}
if (from_exception && mmc_card_need_bkops(card))
goto out;
/*
* If the need BKOPS flag is set, there is no need to check if BKOPS
* is needed since we already know that it does
*/
if (!mmc_card_need_bkops(card)) {
err = mmc_read_bkops_status(card);
if (err) {
pr_err("%s: %s: Failed to read bkops status: %d\n",
mmc_hostname(card->host), __func__, err);
goto out;
}
if (!card->ext_csd.raw_bkops_status)
goto out;
pr_info("%s: %s: raw_bkops_status=0x%x, from_exception=%d\n",
mmc_hostname(card->host), __func__,
card->ext_csd.raw_bkops_status,
from_exception);
}
/*
* If the function was called due to exception, BKOPS will be performed
* after handling the last pending request
*/
if (from_exception) {
pr_debug("%s: %s: Level %d from exception, exit",
mmc_hostname(card->host), __func__,
card->ext_csd.raw_bkops_status);
mmc_card_set_need_bkops(card);
goto out;
}
pr_info("%s: %s: Starting bkops\n", mmc_hostname(card->host), __func__);
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BKOPS_START, 1, 0, false, false);
if (err) {
pr_warn("%s: %s: Error %d when starting bkops\n",
mmc_hostname(card->host), __func__, err);
goto out;
}
MMC_UPDATE_STATS_BKOPS_SEVERITY_LEVEL(card->bkops_info.bkops_stats,
card->ext_csd.raw_bkops_status);
mmc_card_clr_need_bkops(card);
mmc_card_set_doing_bkops(card);
out:
mmc_release_host(card->host);
mmc_rpm_release(card->host, &card->dev);
}
EXPORT_SYMBOL(mmc_start_bkops);
/*
* mmc_wait_data_done() - done callback for data request
* @mrq: done data request
*
* Wakes up mmc context, passed as a callback to host controller driver
*/
static void mmc_wait_data_done(struct mmc_request *mrq)
{
unsigned long flags;
struct mmc_context_info *context_info = &mrq->host->context_info;
spin_lock_irqsave(&context_info->lock, flags);
mrq->host->context_info.is_done_rcv = true;
wake_up_interruptible(&mrq->host->context_info.wait);
spin_unlock_irqrestore(&context_info->lock, flags);
}
/**
* mmc_start_idle_time_bkops() - check if a non urgent BKOPS is
* needed
* @work: The idle time BKOPS work
*/
void mmc_start_idle_time_bkops(struct work_struct *work)
{
struct mmc_card *card = container_of(work, struct mmc_card,
bkops_info.dw.work);
/*
* Prevent a race condition between mmc_stop_bkops and the delayed
* BKOPS work in case the delayed work is executed on another CPU
*/
if (card->bkops_info.cancel_delayed_work)
return;
mmc_start_bkops(card, false);
}
EXPORT_SYMBOL(mmc_start_idle_time_bkops);
static void mmc_wait_done(struct mmc_request *mrq)
{
complete(&mrq->completion);
}
/*
*__mmc_start_data_req() - starts data request
* @host: MMC host to start the request
* @mrq: data request to start
*
* Sets the done callback to be called when request is completed by the card.
* Starts data mmc request execution
*/
static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
{
mrq->done = mmc_wait_data_done;
mrq->host = host;
if (mmc_card_removed(host->card)) {
mrq->cmd->error = -ENOMEDIUM;
mmc_wait_data_done(mrq);
return -ENOMEDIUM;
}
mmc_start_request(host, mrq);
return 0;
}
static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
{
init_completion(&mrq->completion);
mrq->done = mmc_wait_done;
if (mmc_card_removed(host->card)) {
mrq->cmd->error = -ENOMEDIUM;
complete(&mrq->completion);
return -ENOMEDIUM;
}
mmc_start_request(host, mrq);
return 0;
}
/*
* mmc_should_stop_curr_req() - check for stop flow rationality
* @host: MMC host running request.
*
* Check possibility to interrupt current running request
* Returns true in case it is worth to stop transfer,
* false otherwise
*/
static bool mmc_should_stop_curr_req(struct mmc_host *host)
{
int remainder;
if (host->areq->cmd_flags & REQ_URGENT ||
!(host->areq->cmd_flags & REQ_WRITE) ||
(host->areq->cmd_flags & REQ_FUA))
return false;
mmc_host_clk_hold(host);
remainder = (host->ops->get_xfer_remain) ?
host->ops->get_xfer_remain(host) : -1;
mmc_host_clk_release(host);
return (remainder > 0);
}
/*
* mmc_stop_request() - Stops current running request
* @host: MMC host to prepare the command.
*
* Triggers stop flow in the host driver and sends CMD12 (stop command) to the
* card. Sends HPI to get the card out of R1_STATE_PRG immediately
*
* Returns 0 when success, error propagated otherwise
*/
static int mmc_stop_request(struct mmc_host *host)
{
struct mmc_command cmd = {0};
struct mmc_card *card = host->card;
int err = 0;
u32 status;
if (!host->ops->stop_request || !card->ext_csd.hpi_en) {
pr_warn("%s: host ops stop_request() or HPI not supported\n",
mmc_hostname(host));
return -ENOTSUPP;
}
mmc_host_clk_hold(host);
err = host->ops->stop_request(host);
if (err) {
pr_debug("%s: Call to host->ops->stop_request() failed (%d)\n",
mmc_hostname(host), err);
goto out;
}
cmd.opcode = MMC_STOP_TRANSMISSION;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err) {
err = mmc_send_status(card, &status);
if (err) {
pr_err("%s: Get card status fail\n",
mmc_hostname(card->host));
goto out;
}
switch (R1_CURRENT_STATE(status)) {
case R1_STATE_DATA:
case R1_STATE_RCV:
pr_err("%s: CMD12 fails with error (%d)\n",
mmc_hostname(host), err);
goto out;
default:
break;
}
}
err = mmc_interrupt_hpi(card);
if (err) {
pr_err("%s: mmc_interrupt_hpi() failed (%d)\n",
mmc_hostname(host), err);
goto out;
}
out:
mmc_host_clk_release(host);
return err;
}
/*
* mmc_wait_for_data_req_done() - wait for request completed
* @host: MMC host to prepare the command.
* @mrq: MMC request to wait for
*
* Blocks MMC context till host controller will ack end of data request
* execution or new request notification arrives from the block layer.
* Handles command retries.
*
* Returns enum mmc_blk_status after checking errors.
*/
static int mmc_wait_for_data_req_done(struct mmc_host *host,
struct mmc_request *mrq,
struct mmc_async_req *next_req)
{
struct mmc_command *cmd;
struct mmc_context_info *context_info = &host->context_info;
bool pending_is_urgent = false;
bool is_urgent = false;
bool is_done_rcv = false;
int err, ret;
unsigned long flags;
while (1) {
ret = wait_io_event_interruptible(context_info->wait,
(context_info->is_done_rcv ||
context_info->is_new_req ||
context_info->is_urgent));
spin_lock_irqsave(&context_info->lock, flags);
is_urgent = context_info->is_urgent;
is_done_rcv = context_info->is_done_rcv;
context_info->is_waiting_last_req = false;
spin_unlock_irqrestore(&context_info->lock, flags);
if (is_done_rcv) {
context_info->is_done_rcv = false;
context_info->is_new_req = false;
cmd = mrq->cmd;
if (!cmd->error || !cmd->retries ||
mmc_card_removed(host->card)) {
err = host->areq->err_check(host->card,
host->areq);
if (pending_is_urgent || is_urgent) {
/*
* all the success/partial operations
* are done in an addition to handling
* the urgent request
*/
if ((err == MMC_BLK_PARTIAL) ||
(err == MMC_BLK_SUCCESS))
err = pending_is_urgent ?
MMC_BLK_URGENT_DONE
: MMC_BLK_URGENT;
/* reset is_urgent for next request */
context_info->is_urgent = false;
}
break; /* return err */
} else {
pr_info("%s: req failed (CMD%u): %d, retrying...\n",
mmc_hostname(host),
cmd->opcode, cmd->error);
cmd->retries--;
cmd->error = 0;
host->ops->request(host, mrq);
/*
* ignore urgent flow, request retry has greater
* priority than urgent flow
*/
context_info->is_urgent = false;
/* wait for done/new/urgent event again */
continue;
}
} else if (context_info->is_new_req && !is_urgent) {
context_info->is_new_req = false;
if (!next_req) {
err = MMC_BLK_NEW_REQUEST;
break; /* return err */
}
} else if (context_info->is_urgent) {
/*
* The case when block layer sent next urgent
* notification before it receives end_io on
* the current
*/
if (pending_is_urgent)
continue; /* wait for done/new/urgent event */
context_info->is_urgent = false;
context_info->is_new_req = false;
if (mmc_should_stop_curr_req(host)) {
/*
* We are going to stop the ongoing request.
* Update stuff that we ought to do when the
* request actually completes.
*/
mmc_update_clk_scaling(host, false);
err = mmc_stop_request(host);
if (err == MMC_BLK_NO_REQ_TO_STOP) {
pending_is_urgent = true;
/* wait for done/new/urgent event */
continue;
} else if (err && !context_info->is_done_rcv) {
err = MMC_BLK_ABORT;
break;
}
/* running request has finished at this point */
if (context_info->is_done_rcv) {
err = host->areq->err_check(host->card,
host->areq);
context_info->is_done_rcv = false;
break; /* return err */
} else {
mmc_host_clk_release(host);
}
err = host->areq->update_interrupted_req(
host->card, host->areq);
if (!err)
err = MMC_BLK_URGENT;
break; /* return err */
} else {
/*
* The flow will back to wait for is_done_rcv,
* but in this case original is_urgent cleared.
* Mark pending_is_urgent to differentiate the
* case, when is_done_rcv and is_urgent really
* concurrent.
*/
pending_is_urgent = true;
continue; /* wait for done/new/urgent event */
}
} else {
pr_warn("%s: mmc thread unblocked from waiting by signal, ret=%d\n",
mmc_hostname(host),
ret);
continue;
}
}
return err;
}
static void mmc_wait_for_req_done(struct mmc_host *host,
struct mmc_request *mrq)
{
struct mmc_command *cmd;
while (1) {
wait_for_completion_io(&mrq->completion);
cmd = mrq->cmd;
/*
* If host has timed out waiting for the commands which can be
* HPIed then let the caller handle the timeout error as it may
* want to send the HPI command to bring the card out of
* programming state.
*/
if (cmd->ignore_timeout && cmd->error == -ETIMEDOUT)
break;
if (!cmd->error || !cmd->retries ||
mmc_card_removed(host->card))
break;
pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
mmc_hostname(host), cmd->opcode, cmd->error);
cmd->retries--;
cmd->error = 0;
host->ops->request(host, mrq);
}
}
/**
* mmc_pre_req - Prepare for a new request
* @host: MMC host to prepare command
* @mrq: MMC request to prepare for
* @is_first_req: true if there is no previous started request
* that may run in parellel to this call, otherwise false
*
* mmc_pre_req() is called in prior to mmc_start_req() to let
* host prepare for the new request. Preparation of a request may be
* performed while another request is running on the host.
*/
static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
bool is_first_req)
{
if (host->ops->pre_req) {
mmc_host_clk_hold(host);
host->ops->pre_req(host, mrq, is_first_req);
mmc_host_clk_release(host);
}
}
/**
* mmc_post_req - Post process a completed request
* @host: MMC host to post process command
* @mrq: MMC request to post process for
* @err: Error, if non zero, clean up any resources made in pre_req
*
* Let the host post process a completed request. Post processing of
* a request may be performed while another reuqest is running.
*/
static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
int err)
{
if (host->ops->post_req) {
mmc_host_clk_hold(host);
host->ops->post_req(host, mrq, err);
mmc_host_clk_release(host);
}
}
/**
* mmc_cmdq_discard_card_queue - discard the task[s] in the device
* @host: host instance
* @tasks: mask of tasks to be knocked off
* 0: remove all queued tasks
*/
int mmc_cmdq_discard_queue(struct mmc_host *host, u32 tasks)
{
return mmc_discard_queue(host, tasks);
}
EXPORT_SYMBOL(mmc_cmdq_discard_queue);
/**
* mmc_cmdq_post_req - post process of a completed request
* @host: host instance
* @tag: the request tag.
* @err: non-zero is error, success otherwise
*/
void mmc_cmdq_post_req(struct mmc_host *host, int tag, int err)
{
if (likely(host->cmdq_ops->post_req))
host->cmdq_ops->post_req(host, tag, err);
}
EXPORT_SYMBOL(mmc_cmdq_post_req);
/**
* mmc_cmdq_halt - halt/un-halt the command queue engine
* @host: host instance
* @halt: true - halt, un-halt otherwise
*
* Host halts the command queue engine. It should complete
* the ongoing transfer and release the bus.
* All legacy commands can be sent upon successful
* completion of this function.
* Returns 0 on success, negative otherwise
*/
int mmc_cmdq_halt(struct mmc_host *host, bool halt)
{
int err = 0;
if ((halt && mmc_host_halt(host)) ||
(!halt && !mmc_host_halt(host))) {
pr_debug("%s: %s: CQE is already %s\n", mmc_hostname(host),
__func__, halt ? "halted" : "un-halted");
return 0;
}
mmc_host_clk_hold(host);
if (host->cmdq_ops->halt) {
err = host->cmdq_ops->halt(host, halt);
if (!err && halt)
mmc_host_set_halt(host);
else if (!err && !halt)
mmc_host_clr_halt(host);
} else {
err = -ENOSYS;
}
mmc_host_clk_release(host);
return err;
}
EXPORT_SYMBOL(mmc_cmdq_halt);
int mmc_cmdq_start_req(struct mmc_host *host, struct mmc_cmdq_req *cmdq_req)
{
struct mmc_request *mrq = &cmdq_req->mrq;
mrq->host = host;
if (mmc_card_removed(host->card)) {
mrq->cmd->error = -ENOMEDIUM;
return -ENOMEDIUM;
}
mmc_start_cmdq_request(host, mrq);
return 0;
}
EXPORT_SYMBOL(mmc_cmdq_start_req);
static void mmc_cmdq_dcmd_req_done(struct mmc_request *mrq)
{
mmc_host_clk_release(mrq->host);
complete(&mrq->completion);
}
int mmc_cmdq_wait_for_dcmd(struct mmc_host *host,
struct mmc_cmdq_req *cmdq_req)
{
struct mmc_request *mrq = &cmdq_req->mrq;
struct mmc_command *cmd = mrq->cmd;
int err = 0;
init_completion(&mrq->completion);
mrq->done = mmc_cmdq_dcmd_req_done;
err = mmc_cmdq_start_req(host, cmdq_req);
if (err)
return err;
wait_for_completion_io(&mrq->completion);
if (cmd->error) {
pr_err("%s: DCMD %d failed with err %d\n",
mmc_hostname(host), cmd->opcode,
cmd->error);
err = cmd->error;
mmc_host_clk_hold(host);
host->cmdq_ops->dumpstate(host);
mmc_host_clk_release(host);
}
return err;
}
EXPORT_SYMBOL(mmc_cmdq_wait_for_dcmd);
int mmc_cmdq_prepare_flush(struct mmc_command *cmd)
{
return __mmc_switch_cmdq_mode(cmd, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_FLUSH_CACHE, 1,
0, true, true);
}
EXPORT_SYMBOL(mmc_cmdq_prepare_flush);
/**
* mmc_start_req - start a non-blocking request
* @host: MMC host to start command
* @areq: async request to start
* @error: out parameter returns 0 for success, otherwise non zero
*
* Start a new MMC custom command request for a host.
* If there is on ongoing async request wait for completion
* of that request and start the new one and return.
* Does not wait for the new request to complete.
*
* Returns the completed request, NULL in case of none completed.
* Wait for the an ongoing request (previoulsy started) to complete and
* return the completed request. If there is no ongoing request, NULL
* is returned without waiting. NULL is not an error condition.
*/
struct mmc_async_req *mmc_start_req(struct mmc_host *host,
struct mmc_async_req *areq, int *error)
{
int err = 0;
int start_err = 0;
struct mmc_async_req *data = host->areq;
unsigned long flags;
bool is_urgent;
/* Prepare a new request */
if (areq) {
/*
* start waiting here for possible interrupt
* because mmc_pre_req() taking long time
*/
mmc_pre_req(host, areq->mrq, !host->areq);
}
if (host->areq) {
err = mmc_wait_for_data_req_done(host, host->areq->mrq,
areq);
if (err == MMC_BLK_URGENT || err == MMC_BLK_URGENT_DONE) {
mmc_post_req(host, host->areq->mrq, 0);
host->areq = NULL;
if (areq) {
if (!(areq->cmd_flags &
MMC_REQ_NOREINSERT_MASK)) {
areq->reinsert_req(areq);
mmc_post_req(host, areq->mrq, 0);
} else {
start_err = __mmc_start_data_req(host,
areq->mrq);
if (start_err)
mmc_post_req(host, areq->mrq,
-EINVAL);
else
host->areq = areq;
}
}
goto exit;
} else if (err == MMC_BLK_NEW_REQUEST) {
if (error)
*error = err;
/*
* The previous request was not completed,
* nothing to return
*/
return NULL;
}
/*
* Check BKOPS urgency for each R1 response
*/
if (host->card && mmc_card_mmc(host->card) &&
((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
(mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
(host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
mmc_start_bkops(host->card, true);
pr_debug("%s: %s: completed BKOPs due to exception",
mmc_hostname(host), __func__);
}
}
if (!err && areq) {
trace_mmc_blk_rw_start(areq->mrq->cmd->opcode,
areq->mrq->cmd->arg,
areq->mrq->data);
/* urgent notification may come again */
spin_lock_irqsave(&host->context_info.lock, flags);
is_urgent = host->context_info.is_urgent;
host->context_info.is_urgent = false;
spin_unlock_irqrestore(&host->context_info.lock, flags);
if (!is_urgent || (areq->cmd_flags & REQ_URGENT)) {
start_err = __mmc_start_data_req(host, areq->mrq);
} else {
/* previous request was done */
err = MMC_BLK_URGENT_DONE;
if (host->areq) {
mmc_post_req(host, host->areq->mrq, 0);
host->areq = NULL;
}
areq->reinsert_req(areq);
mmc_post_req(host, areq->mrq, 0);
goto exit;
}
}
if (host->areq)
mmc_post_req(host, host->areq->mrq, 0);
/* Cancel a prepared request if it was not started. */
if ((err || start_err) && areq)
mmc_post_req(host, areq->mrq, -EINVAL);
if (err)
host->areq = NULL;
else
host->areq = areq;
exit:
if (error)
*error = err;
return data;
}
EXPORT_SYMBOL(mmc_start_req);
/**
* 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. Does not attempt to parse the
* response.
*/
void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
{
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
if (mmc_bus_needs_resume(host))
mmc_resume_bus(host);
#endif
__mmc_start_req(host, mrq);
mmc_wait_for_req_done(host, mrq);
}
EXPORT_SYMBOL(mmc_wait_for_req);
bool mmc_card_is_prog_state(struct mmc_card *card)
{
bool rc;
struct mmc_command cmd;
mmc_claim_host(card->host);
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = MMC_SEND_STATUS;
if (!mmc_host_is_spi(card->host))
cmd.arg = card->rca << 16;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
rc = mmc_wait_for_cmd(card->host, &cmd, 0);
if (rc) {
pr_err("%s: Get card status fail. rc=%d\n",
mmc_hostname(card->host), rc);
rc = false;
goto out;
}
if (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG)
rc = true;
else
rc = false;
out:
mmc_release_host(card->host);
return rc;
}
EXPORT_SYMBOL(mmc_card_is_prog_state);
/**
* mmc_interrupt_hpi - Issue for High priority Interrupt
* @card: the MMC card associated with the HPI transfer
*
* Issued High Priority Interrupt, and check for card status
* until out-of prg-state.
*/
int mmc_interrupt_hpi(struct mmc_card *card)
{
int err;
u32 status;
unsigned long prg_wait;
BUG_ON(!card);
if (!card->ext_csd.hpi_en) {
pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
return 1;
}
mmc_claim_host(card->host);
err = mmc_send_status(card, &status);
if (err) {
pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
goto out;
}
switch (R1_CURRENT_STATE(status)) {
case R1_STATE_IDLE:
case R1_STATE_READY:
case R1_STATE_STBY:
case R1_STATE_TRAN:
/*
* In idle and transfer states, HPI is not needed and the caller
* can issue the next intended command immediately
*/
goto out;
case R1_STATE_PRG:
break;
default:
/* In all other states, it's illegal to issue HPI */
pr_debug("%s: HPI cannot be sent. Card state=%d\n",
mmc_hostname(card->host), R1_CURRENT_STATE(status));
err = -EINVAL;
goto out;
}
err = mmc_send_hpi_cmd(card, &status);
prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
do {
err = mmc_send_status(card, &status);
if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
break;
if (time_after(jiffies, prg_wait)) {
err = mmc_send_status(card, &status);
if (!err && R1_CURRENT_STATE(status) != R1_STATE_TRAN)
err = -ETIMEDOUT;
else
break;
}
} while (!err);
out:
mmc_release_host(card->host);
return err;
}
EXPORT_SYMBOL(mmc_interrupt_hpi);
/**
* 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 = {NULL};
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);
#ifdef CONFIG_PM_RUNTIME
static int mmc_get_bkops_status(struct mmc_card *card)
{
int err = 0;
if (!mmc_use_core_runtime_pm(card->host) && mmc_card_doing_bkops(card)
&& (card->host->parent->power.runtime_status == RPM_SUSPENDING)
&& mmc_card_is_prog_state(card))
err = -EBUSY;
return err;
}
#else
static int mmc_get_bkops_status(struct mmc_card *card)
{
int err = 0;
if (!mmc_use_core_runtime_pm(card->host) && mmc_card_doing_bkops(card)
&& mmc_card_is_prog_state(card))
err = -EBUSY;
return err;
}
#endif
/**
* mmc_stop_bkops - stop ongoing BKOPS
* @card: MMC card to check BKOPS
*
* Send HPI command to stop ongoing background operations to
* allow rapid servicing of foreground operations, e.g. read/
* writes. Wait until the card comes out of the programming state
* to avoid errors in servicing read/write requests.
*
* The function should be called with host claimed.
*/
int mmc_stop_bkops(struct mmc_card *card)
{
int err = 0;
BUG_ON(!card);
/*
* Notify the delayed work to be cancelled, in case it was already
* removed from the queue, but was not started yet
*/
card->bkops_info.cancel_delayed_work = true;
if (delayed_work_pending(&card->bkops_info.dw))
cancel_delayed_work_sync(&card->bkops_info.dw);
if (!mmc_card_doing_bkops(card))
goto out;
/*
* If idle time bkops is running on the card, let's not get into
* suspend.
*/
if (mmc_get_bkops_status(card)) {
err = -EBUSY;
goto out;
}
err = mmc_interrupt_hpi(card);
/*
* If err is EINVAL, we can't issue an HPI.
* It should complete the BKOPS.
*/
if (!err || (err == -EINVAL)) {
mmc_card_clr_doing_bkops(card);
err = 0;
}
MMC_UPDATE_BKOPS_STATS_HPI(card->bkops_info.bkops_stats);
out:
return err;
}
EXPORT_SYMBOL(mmc_stop_bkops);
int mmc_read_bkops_status(struct mmc_card *card)
{
int err;
u8 *ext_csd;
/*
* In future work, we should consider storing the entire ext_csd.
*/
ext_csd = kmalloc(512, GFP_KERNEL);
if (!ext_csd) {
pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
mmc_hostname(card->host));
return -ENOMEM;
}
if (card->bkops_info.bkops_stats.ignore_card_bkops_status) {
pr_debug("%s: skipping read raw_bkops_status in unittest mode",
__func__);
return 0;
}
mmc_claim_host(card->host);
err = mmc_send_ext_csd(card, ext_csd);
mmc_release_host(card->host);
if (err)
goto out;
card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
out:
kfree(ext_csd);
return err;
}
EXPORT_SYMBOL(mmc_read_bkops_status);
/**
* 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;
if (!card) {
WARN_ON(1);
return;
}
/*
* 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.tacc_ns * mult;
data->timeout_clks = card->csd.tacc_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 (mmc_host_clk_rate(card->host))
timeout_us += data->timeout_clks * 1000 /
(mmc_host_clk_rate(card->host) / 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 || mmc_card_blockaddr(card)) {
data->timeout_ns = limit_us * 1000;
data->timeout_clks = 0;
}
}
/*
* 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 */
}
}
/* Increase the timeout values for some bad INAND MCP devices */
if (card->quirks & MMC_QUIRK_INAND_DATA_TIMEOUT) {
data->timeout_ns = 4000000000u; /* 4s */
data->timeout_clks = 0;
}
/* Some emmc cards require a longer read/write time */
if (card->quirks & MMC_QUIRK_BROKEN_DATA_TIMEOUT) {
if (data->timeout_ns < 4000000000u)
data->timeout_ns = 4000000000u; /* 4s */
}
}
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);
/**
* __mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
* @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, atomic_t *abort)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
int stop;
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 || host->claimer == current)
break;
spin_unlock_irqrestore(&host->lock, flags);
schedule();
spin_lock_irqsave(&host->lock, flags);
}
set_current_state(TASK_RUNNING);
if (!stop) {
host->claimed = 1;
host->claimer = current;
host->claim_cnt += 1;
} else
wake_up(&host->wq);
spin_unlock_irqrestore(&host->lock, flags);
remove_wait_queue(&host->wq, &wait);
if (host->ops->enable && !stop && host->claim_cnt == 1)
host->ops->enable(host);
return stop;
}
EXPORT_SYMBOL(__mmc_claim_host);
/**
* mmc_try_claim_host - try exclusively to claim a host
* @host: mmc host to claim
*
* Returns %1 if the host is claimed, %0 otherwise.
*/
int mmc_try_claim_host(struct mmc_host *host)
{
int claimed_host = 0;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
if (!host->claimed || host->claimer == current) {
host->claimed = 1;
host->claimer = current;
host->claim_cnt += 1;
claimed_host = 1;
}
spin_unlock_irqrestore(&host->lock, flags);
if (host->ops->enable && claimed_host && host->claim_cnt == 1)
host->ops->enable(host);
return claimed_host;
}
EXPORT_SYMBOL(mmc_try_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);
if (host->ops->disable && host->claim_cnt == 1)
host->ops->disable(host);
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 = NULL;
spin_unlock_irqrestore(&host->lock, flags);
wake_up(&host->wq);
}
}
EXPORT_SYMBOL(mmc_release_host);
/*
* Internal function that does the actual ios call to the host driver,
* optionally printing some debug output.
*/
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,
ios->bus_width, ios->timing);
if (ios->clock > 0)
mmc_set_ungated(host);
host->ops->set_ios(host, ios);
if (ios->old_rate != ios->clock) {
if (likely(ios->clk_ts)) {
char trace_info[80];
snprintf(trace_info, 80,
"%s: freq_KHz %d --> %d | t = %d",
mmc_hostname(host), ios->old_rate / 1000,
ios->clock / 1000, jiffies_to_msecs(
(long)jiffies - (long)ios->clk_ts));
trace_mmc_clk(trace_info);
}
ios->old_rate = ios->clock;
ios->clk_ts = jiffies;
}
}
EXPORT_SYMBOL(mmc_set_ios);
/*
* Control chip select pin on a host.
*/
void mmc_set_chip_select(struct mmc_host *host, int mode)
{
mmc_host_clk_hold(host);
host->ios.chip_select = mode;
mmc_set_ios(host);
mmc_host_clk_release(host);
}
/*
* Sets the host clock to the highest possible frequency that
* is below "hz".
*/
static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
{
WARN_ON(hz < host->f_min);
if (hz > host->f_max)
hz = host->f_max;
host->ios.clock = hz;
mmc_set_ios(host);
}
void mmc_set_clock(struct mmc_host *host, unsigned int hz)
{
mmc_host_clk_hold(host);
__mmc_set_clock(host, hz);
mmc_host_clk_release(host);
}
#ifdef CONFIG_MMC_CLKGATE
/*
* This gates the clock by setting it to 0 Hz.
*/
void mmc_gate_clock(struct mmc_host *host)
{
unsigned long flags;
WARN_ON(!host->ios.clock);
spin_lock_irqsave(&host->clk_lock, flags);
host->clk_old = host->ios.clock;
host->ios.clock = 0;
host->clk_gated = true;
spin_unlock_irqrestore(&host->clk_lock, flags);
mmc_set_ios(host);
}
/*
* This restores the clock from gating by using the cached
* clock value.
*/
void mmc_ungate_clock(struct mmc_host *host)
{
/*
* We should previously have gated the clock, so the clock shall
* be 0 here! The clock may however be 0 during initialization,
* when some request operations are performed before setting
* the frequency. When ungate is requested in that situation
* we just ignore the call.
*/
if (host->clk_old) {
WARN_ON(host->ios.clock);
/* This call will also set host->clk_gated to false */
__mmc_set_clock(host, host->clk_old);
}
}
void mmc_set_ungated(struct mmc_host *host)
{
unsigned long flags;
/*
* We've been given a new frequency while the clock is gated,
* so make sure we regard this as ungating it.
*/
spin_lock_irqsave(&host->clk_lock, flags);
host->clk_gated = false;
spin_unlock_irqrestore(&host->clk_lock, flags);
}
#else
void mmc_set_ungated(struct mmc_host *host)
{
}
#endif
/*
* Change the bus mode (open drain/push-pull) of a host.
*/
void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
{
mmc_host_clk_hold(host);
host->ios.bus_mode = mode;
mmc_set_ios(host);
mmc_host_clk_release(host);
}
/*
* Change data bus width of a host.
*/
void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
{
mmc_host_clk_hold(host);
host->ios.bus_width = width;
mmc_set_ios(host);
mmc_host_clk_release(host);
}
/**
* 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;
}
EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
#ifdef CONFIG_REGULATOR
/**
* mmc_regulator_get_ocrmask - return mask of supported voltages
* @supply: regulator to use
*
* This returns either a negative errno, or a mask of voltages that
* can be provided to MMC/SD/SDIO devices using the specified voltage
* regulator. This would normally be called before registering the
* MMC host adapter.
*/
int mmc_regulator_get_ocrmask(struct regulator *supply)
{
int result = 0;
int count;
int i;
count = regulator_count_voltages(supply);
if (count < 0)
return count;
for (i = 0; i < count; i++) {
int vdd_uV;
int vdd_mV;
vdd_uV = regulator_list_voltage(supply, i);
if (vdd_uV <= 0)
continue;
vdd_mV = vdd_uV / 1000;
result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
}
return result;
}
EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
/**
* mmc_regulator_set_ocr - set regulator to match host->ios voltage
* @mmc: the host to regulate
* @supply: regulator to use
* @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
*
* Returns zero on success, else negative errno.
*
* MMC host drivers may use this to enable or disable a regulator using
* a particular supply voltage. This would normally be called from the
* set_ios() method.
*/
int mmc_regulator_set_ocr(struct mmc_host *mmc,
struct regulator *supply,
unsigned short vdd_bit)
{
int result = 0;
int min_uV, max_uV;
if (vdd_bit) {
int tmp;
int voltage;
/*
* REVISIT mmc_vddrange_to_ocrmask() may have set some
* bits this regulator doesn't quite support ... don't
* be too picky, most cards and regulators are OK with
* a 0.1V range goof (it's a small error percentage).
*/
tmp = vdd_bit - ilog2(MMC_VDD_165_195);
if (tmp == 0) {
min_uV = 1650 * 1000;
max_uV = 1950 * 1000;
} else {
min_uV = 1900 * 1000 + tmp * 100 * 1000;
max_uV = min_uV + 100 * 1000;
}
/*
* If we're using a fixed/static regulator, don't call
* regulator_set_voltage; it would fail.
*/
voltage = regulator_get_voltage(supply);
if (!regulator_can_change_voltage(supply))
min_uV = max_uV = voltage;
if (voltage < 0)
result = voltage;
else if (voltage < min_uV || voltage > max_uV)
result = regulator_set_voltage(supply, min_uV, max_uV);
else
result = 0;
if (result == 0 && !mmc->regulator_enabled) {
result = regulator_enable(supply);
if (!result)
mmc->regulator_enabled = true;
}
} else if (mmc->regulator_enabled) {
result = regulator_disable(supply);
if (result == 0)
mmc->regulator_enabled = false;
}
if (result)
dev_err(mmc_dev(mmc),
"could not set regulator OCR (%d)\n", result);
return result;
}
EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
int mmc_regulator_get_supply(struct mmc_host *mmc)
{
struct device *dev = mmc_dev(mmc);
struct regulator *supply;
int ret;
supply = devm_regulator_get(dev, "vmmc");
mmc->supply.vmmc = supply;
mmc->supply.vqmmc = devm_regulator_get(dev, "vqmmc");
if (IS_ERR(supply))
return PTR_ERR(supply);
ret = mmc_regulator_get_ocrmask(supply);
if (ret > 0)
mmc->ocr_avail = ret;
else
dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
return 0;
}
EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
#endif /* CONFIG_REGULATOR */
/*
* 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;
ocr &= host->ocr_avail;
bit = ffs(ocr);
if (bit) {
bit -= 1;
ocr &= 3 << bit;
mmc_host_clk_hold(host);
host->ios.vdd = bit;
mmc_set_ios(host);
mmc_host_clk_release(host);
} else {
pr_warning("%s: host doesn't support card's voltages\n",
mmc_hostname(host));
ocr = 0;
}
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) {
mmc_host_clk_hold(host);
err = host->ops->start_signal_voltage_switch(host, &host->ios);
mmc_host_clk_release(host);
}
if (err)
host->ios.signal_voltage = old_signal_voltage;
return err;
}
int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
{
struct mmc_command cmd = {0};
int err = 0;
u32 clock;
BUG_ON(!host);
/*
* Send CMD11 only if the request is to switch the card to
* 1.8V signalling.
*/
if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
return __mmc_set_signal_voltage(host, signal_voltage);
/*
* 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_warning("%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;
/*
* Hold the clock reference so clock doesn't get auto gated during this
* voltage switch sequence.
*/
mmc_host_clk_hold(host);
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
goto exit;
if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) {
err = -EIO;
goto exit;
}
/*
* 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;
}
/*
* During a signal voltage level switch, the clock must be gated
* for 5 ms according to the SD spec
*/
host->card_clock_off = true;
clock = host->ios.clock;
host->ios.clock = 0;
mmc_set_ios(host);
if (__mmc_set_signal_voltage(host, signal_voltage)) {
/*
* Voltages may not have been switched, but we've already
* sent CMD11, so a power cycle is required anyway
*/
err = -EAGAIN;
host->ios.clock = clock;
mmc_set_ios(host);
host->card_clock_off = false;
goto power_cycle;
}
/* Keep clock gated for at least 5 ms */
mmc_delay(5);
host->ios.clock = clock;
mmc_set_ios(host);
host->card_clock_off = false;
/* 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);
}
exit:
mmc_host_clk_release(host);
return err;
}
/*
* Select timing parameters for host.
*/
void mmc_set_timing(struct mmc_host *host, unsigned int timing)
{
mmc_host_clk_hold(host);
host->ios.timing = timing;
mmc_set_ios(host);
mmc_host_clk_release(host);
}
/*
* Select appropriate driver type for host.
*/
void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
{
mmc_host_clk_hold(host);
host->ios.drv_type = drv_type;
mmc_set_ios(host);
mmc_host_clk_release(host);
}
/*
* 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)
{
int bit;
if (host->ios.power_mode == MMC_POWER_ON)
return;
mmc_host_clk_hold(host);
/* If ocr is set, we use it */
if (host->ocr)
bit = ffs(host->ocr) - 1;
else
bit = fls(host->ocr_avail) - 1;
host->ios.vdd = bit;
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_OPENDRAIN;
}
host->ios.power_mode = MMC_POWER_UP;
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(host);
/*
* This delay should be sufficient to allow the power supply
* to reach the minimum voltage.
*/
mmc_delay(10);
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(10);
/* Set signal voltage to 3.3V */
__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
mmc_host_clk_release(host);
}
void mmc_power_off(struct mmc_host *host)
{
if (host->ios.power_mode == MMC_POWER_OFF)
return;
mmc_host_clk_hold(host);
host->ios.clock = 0;
host->ios.vdd = 0;
/*
* Reset ocr mask to be the highest possible voltage supported for
* this mmc host. This value will be used at next power up.
*/
host->ocr = 1 << (fls(host->ocr_avail) - 1);
if (!mmc_host_is_spi(host)) {
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.chip_select = MMC_CS_DONTCARE;
}
host->ios.power_mode = MMC_POWER_OFF;
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(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);
mmc_host_clk_release(host);
}
void mmc_power_cycle(struct mmc_host *host)
{
mmc_power_off(host);
/* Wait at least 1 ms according to SD spec */
mmc_delay(1);
mmc_power_up(host);
}
/*
* Cleanup when the last reference to the bus operator is dropped.
*/
static void __mmc_release_bus(struct mmc_host *host)
{
BUG_ON(!host);
BUG_ON(host->bus_refs);
BUG_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);
}
int mmc_resume_bus(struct mmc_host *host)
{
unsigned long flags;
int err = 0;
if (!mmc_bus_needs_resume(host))
return -EINVAL;
spin_lock_irqsave(&host->lock, flags);
host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME;
host->rescan_disable = 0;
spin_unlock_irqrestore(&host->lock, flags);
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
mmc_power_up(host);
BUG_ON(!host->bus_ops->resume);
host->bus_ops->resume(host);
if (mmc_card_cmdq(host->card)) {
err = mmc_cmdq_halt(host, false);
if (err)
pr_err("%s: un-halt: failed: %d\n",
__func__, err);
else
mmc_card_clr_suspended(host->card);
}
host->dev_status = DEV_RESUMED;
}
mmc_bus_put(host);
return 0;
}
EXPORT_SYMBOL(mmc_resume_bus);
/*
* 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;
BUG_ON(!host);
BUG_ON(!ops);
WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
BUG_ON(host->bus_ops);
BUG_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;
BUG_ON(!host);
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);
}
/**
* 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)
{
#ifdef CONFIG_MMC_DEBUG
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
WARN_ON(host->removed);
spin_unlock_irqrestore(&host->lock, flags);
#endif
host->detect_change = 1;
mmc_schedule_delayed_work(&host->detect, delay);
}
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 cards that define High Capacity
* Erase Size, whether it is switched on or not, limit to that size.
* Otherwise just have a stab at a good value. 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.
*/
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->ext_csd.hc_erase_size) {
card->pref_erase = card->ext_csd.hc_erase_size;
} 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.tacc_clks * mult;
unsigned int timeout_us;
/* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
if (card->csd.tacc_ns < 1000000)
timeout_us = (card->csd.tacc_ns * mult) / 1000;
else
timeout_us = (card->csd.tacc_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) /
(mmc_host_clk_rate(card->host) / 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;
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 u32 mmc_get_erase_qty(struct mmc_card *card, u32 from, u32 to)
{
u32 qty = 0;
/*
* 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;
return qty;
}
static int mmc_cmdq_send_erase_cmd(struct mmc_cmdq_req *cmdq_req,
struct mmc_card *card, u32 opcode, u32 arg, u32 qty)
{
struct mmc_command *cmd = cmdq_req->mrq.cmd;
int err;
memset(cmd, 0, sizeof(struct mmc_command));
cmd->opcode = opcode;
cmd->arg = arg;
if (cmd->opcode == MMC_ERASE) {
cmd->flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
cmd->cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
} else {
cmd->flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
}
err = mmc_cmdq_wait_for_dcmd(card->host, cmdq_req);
if (err) {
pr_err("mmc_erase: group start error %d, status %#x\n",
err, cmd->resp[0]);
return -EIO;
}
return 0;
}
static int mmc_cmdq_do_erase(struct mmc_cmdq_req *cmdq_req,
struct mmc_card *card, unsigned int from,
unsigned int to, unsigned int arg)
{
struct mmc_command *cmd = cmdq_req->mrq.cmd;
unsigned int qty = 0;
unsigned long timeout;
unsigned int fr, nr;
int err;
fr = from;
nr = to - from + 1;
trace_mmc_blk_erase_start(arg, fr, nr);
qty = mmc_get_erase_qty(card, from, to);
if (!mmc_card_blockaddr(card)) {
from <<= 9;
to <<= 9;
}
err = mmc_cmdq_send_erase_cmd(cmdq_req, card, MMC_ERASE_GROUP_START,
from, qty);
if (err)
goto out;
err = mmc_cmdq_send_erase_cmd(cmdq_req, card, MMC_ERASE_GROUP_END,
to, qty);
if (err)
goto out;
err = mmc_cmdq_send_erase_cmd(cmdq_req, card, MMC_ERASE,
arg, qty);
if (err)
goto out;
timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
do {
memset(cmd, 0, sizeof(struct mmc_command));
cmd->opcode = MMC_SEND_STATUS;
cmd->arg = card->rca << 16;
cmd->flags = MMC_RSP_R1 | MMC_CMD_AC;
/* Do not retry else we can't see errors */
err = mmc_cmdq_wait_for_dcmd(card->host, cmdq_req);
if (err || (cmd->resp[0] & 0xFDF92000)) {
pr_err("error %d requesting status %#x\n",
err, cmd->resp[0]);
err = -EIO;
goto out;
}
/* Timeout if the device never becomes ready for data and
* never leaves the program state.
*/
if (time_after(jiffies, timeout)) {
pr_err("%s: Card stuck in programming state! %s\n",
mmc_hostname(card->host), __func__);
err = -EIO;
goto out;
}
} while (!(cmd->resp[0] & R1_READY_FOR_DATA) ||
(R1_CURRENT_STATE(cmd->resp[0]) == R1_STATE_PRG));
out:
trace_mmc_blk_erase_end(arg, fr, nr);
return err;
}
static int mmc_do_erase(struct mmc_card *card, unsigned int from,
unsigned int to, unsigned int arg)
{
struct mmc_command cmd = {0};
unsigned int qty = 0;
unsigned long timeout;
unsigned int fr, nr;
int err;
fr = from;
nr = to - from + 1;
trace_mmc_blk_erase_start(arg, fr, nr);
qty = mmc_get_erase_qty(card, from, to);
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;
cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
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;
timeout = jiffies + msecs_to_jiffies(MMC_CORE_TIMEOUT_MS);
do {
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = MMC_SEND_STATUS;
cmd.arg = card->rca << 16;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
/* Do not retry else we can't see errors */
err = mmc_wait_for_cmd(card->host, &cmd, 0);
if (err || (cmd.resp[0] & 0xFDF92000)) {
pr_err("error %d requesting status %#x\n",
err, cmd.resp[0]);
err = -EIO;
goto out;
}
/* Timeout if the device never becomes ready for data and
* never leaves the program state.
*/
if (time_after(jiffies, timeout)) {
pr_err("%s: Card stuck in programming state! %s\n",
mmc_hostname(card->host), __func__);
err = -EIO;
goto out;
}
} while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
(R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
out:
trace_mmc_blk_erase_end(arg, fr, nr);
return err;
}
int mmc_erase_sanity_check(struct mmc_card *card, unsigned int from,
unsigned int nr, unsigned int arg)
{
if (!(card->host->caps & MMC_CAP_ERASE) ||
!(card->csd.cmdclass & CCC_ERASE))
return -EOPNOTSUPP;
if (!card->erase_size)
return -EOPNOTSUPP;
if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
return -EOPNOTSUPP;
if ((arg & MMC_SECURE_ARGS) &&
!(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
return -EOPNOTSUPP;
if ((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;
}
return 0;
}
int mmc_cmdq_erase(struct mmc_cmdq_req *cmdq_req,
struct mmc_card *card, unsigned int from, unsigned int nr,
unsigned int arg)
{
unsigned int rem, to = from + nr;
int ret;
ret = mmc_erase_sanity_check(card, from, nr, arg);
if (ret)
return ret;
if (arg == MMC_ERASE_ARG) {
rem = from % card->erase_size;
if (rem) {
rem = card->erase_size - rem;
from += rem;
if (nr > rem)
nr -= rem;
else
return 0;
}
rem = nr % card->erase_size;
if (rem)
nr -= rem;
}
if (nr == 0)
return 0;
to = from + nr;
if (to <= from)
return -EINVAL;
/* 'from' and 'to' are inclusive */
to -= 1;
return mmc_cmdq_do_erase(cmdq_req, card, from, to, arg);
}
EXPORT_SYMBOL(mmc_cmdq_erase);
/**
* mmc_erase - erase sectors.
* @card: card to erase
* @from: first sector to erase
* @nr: number of sectors to erase
* @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
*
* 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 ret;
ret = mmc_erase_sanity_check(card, from, nr, arg);
if (ret)
return ret;
if (arg == MMC_ERASE_ARG) {
rem = from % card->erase_size;
if (rem) {
rem = card->erase_size - rem;
from += rem;
if (nr > rem)
nr -= rem;
else
return 0;
}
rem = nr % card->erase_size;
if (rem)
nr -= rem;
}
if (nr == 0)
return 0;
to = from + nr;
if (to <= from)
return -EINVAL;
/* 'from' and 'to' are inclusive */
to -= 1;
return mmc_do_erase(card, from, to, arg);
}
EXPORT_SYMBOL(mmc_erase);
int mmc_can_erase(struct mmc_card *card)
{
if ((card->host->caps & MMC_CAP_ERASE) &&
(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)
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)
&& (card->host->caps2 & MMC_CAP2_SANITIZE))
return 1;
return 0;
}
EXPORT_SYMBOL(mmc_can_sanitize);
int mmc_can_secure_erase_trim(struct mmc_card *card)
{
if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
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, timeout;
unsigned int last_timeout = 0;
if (card->erase_shift)
max_qty = UINT_MAX >> card->erase_shift;
else if (mmc_card_sd(card))
max_qty = UINT_MAX;
else
max_qty = UINT_MAX / card->erase_size;
/* Find the largest qty with an OK 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 (timeout > host->max_discard_to)
break;
if (timeout < last_timeout)
break;
last_timeout = timeout;
y = x;
}
qty += y;
} while (y);
if (!qty)
return 0;
if (qty == 1)
return 1;
/* Convert qty to sectors */
if (card->erase_shift)
max_discard = --qty << card->erase_shift;
else if (mmc_card_sd(card))
max_discard = qty;
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;
if (!host->max_discard_to)
return UINT_MAX;
/*
* 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 = 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_discard_to);
return max_discard;
}
EXPORT_SYMBOL(mmc_calc_max_discard);
int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
{
struct mmc_command cmd = {0};
if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(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);
int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
bool is_rel_write)
{
struct mmc_command cmd = {0};
cmd.opcode = MMC_SET_BLOCK_COUNT;
cmd.arg = blockcount & 0x0000FFFF;
if (is_rel_write)
cmd.arg |= 1 << 31;
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_blockcount);
static void mmc_hw_reset_for_init(struct mmc_host *host)
{
if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
return;
mmc_host_clk_hold(host);
host->ops->hw_reset(host);
mmc_host_clk_release(host);
}
int mmc_can_reset(struct mmc_card *card)
{
u8 rst_n_function;
if (mmc_card_sdio(card))
return 0;
if (mmc_card_mmc(card) && (card->host->caps & MMC_CAP_HW_RESET)) {
rst_n_function = card->ext_csd.rst_n_function;
if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) !=
EXT_CSD_RST_N_ENABLED)
return 0;
}
return 1;
}
EXPORT_SYMBOL(mmc_can_reset);
static int mmc_do_hw_reset(struct mmc_host *host, int check)
{
struct mmc_card *card = host->card;
int ret;
if (!host->bus_ops->power_restore)
return -EOPNOTSUPP;
if (!card)
return -EINVAL;
if (!mmc_can_reset(card))
return -EOPNOTSUPP;
mmc_host_clk_hold(host);
mmc_set_clock(host, host->f_init);
if (mmc_card_mmc(card) && host->ops->hw_reset)
host->ops->hw_reset(host);
else
mmc_power_cycle(host);
/* If the reset has happened, then a status command will fail */
if (check) {
struct mmc_command cmd = {0};
int err;
cmd.opcode = MMC_SEND_STATUS;
if (!mmc_host_is_spi(card->host))
cmd.arg = card->rca << 16;
cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(card->host, &cmd, 0);
if (!err) {
mmc_host_clk_release(host);
return -ENOSYS;
}
}
host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
if (mmc_host_is_spi(host)) {
host->ios.chip_select = MMC_CS_HIGH;
host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
} else {
host->ios.chip_select = MMC_CS_DONTCARE;
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
}
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(host);
mmc_host_clk_release(host);
mmc_claim_host(host);
ret = host->bus_ops->power_restore(host);
mmc_release_host(host);
return ret;
}
/*
* mmc_cmdq_hw_reset: Helper API for doing
* reset_all of host and reinitializing card.
* This must be called with mmc_claim_host
* acquired by the caller.
*/
int mmc_cmdq_hw_reset(struct mmc_host *host)
{
if (!host->bus_ops->power_restore)
return -EOPNOTSUPP;
mmc_power_cycle(host);
mmc_select_voltage(host, host->ocr);
return host->bus_ops->power_restore(host);
}
EXPORT_SYMBOL(mmc_cmdq_hw_reset);
int mmc_hw_reset(struct mmc_host *host)
{
return mmc_do_hw_reset(host, 0);
}
EXPORT_SYMBOL(mmc_hw_reset);
int mmc_hw_reset_check(struct mmc_host *host)
{
return mmc_do_hw_reset(host, 1);
}
EXPORT_SYMBOL(mmc_hw_reset_check);
/**
* mmc_reset_clk_scale_stats() - reset clock scaling statistics
* @host: pointer to mmc host structure
*/
void mmc_reset_clk_scale_stats(struct mmc_host *host)
{
if (!host->clk_scaling.enable)
return;
host->clk_scaling.busy_time_us = 0;
host->clk_scaling.window_time = jiffies;
host->clk_scaling.cq_is_busy_started = false;
}
EXPORT_SYMBOL_GPL(mmc_reset_clk_scale_stats);
/**
* mmc_get_max_frequency() - get max. frequency supported
* @host: pointer to mmc host structure
*
* Returns max. frequency supported by card/host. If the
* timing mode is SDR50/SDR104/HS200/DDR50 return appropriate
* max. frequency in these modes else, use the current frequency.
* Also, allow host drivers to overwrite the frequency in case
* they support "get_max_frequency" host ops.
*/
unsigned long mmc_get_max_frequency(struct mmc_host *host)
{
unsigned long freq;
unsigned char timing;
if (host->ops && host->ops->get_max_frequency) {
freq = host->ops->get_max_frequency(host);
goto out;
}
if (mmc_card_hs400(host->card))
timing = MMC_TIMING_MMC_HS400;
else
timing = host->ios.timing;
switch (timing) {
case MMC_TIMING_UHS_SDR50:
freq = UHS_SDR50_MAX_DTR;
break;
case MMC_TIMING_UHS_SDR104:
freq = UHS_SDR104_MAX_DTR;
break;
case MMC_TIMING_MMC_HS200:
freq = MMC_HS200_MAX_DTR;
break;
case MMC_TIMING_UHS_DDR50:
freq = UHS_DDR50_MAX_DTR;
break;
case MMC_TIMING_MMC_HS400:
freq = MMC_HS400_MAX_DTR;
break;
default:
mmc_host_clk_hold(host);
freq = host->ios.clock;
mmc_host_clk_release(host);
break;
}
out:
return freq;
}
EXPORT_SYMBOL_GPL(mmc_get_max_frequency);
/**
* mmc_get_min_frequency() - get min. frequency supported
* @host: pointer to mmc host structure
*
* Returns min. frequency supported by card/host which doesn't impair
* performance for most usecases. If the timing mode is SDR50/SDR104/HS200
* return 50MHz value. If timing mode is DDR50 return 25MHz so that
* throughput would be equivalent to SDR50/SDR104 in 50MHz. Also, allow
* host drivers to overwrite the frequency in case they support
* "get_min_frequency" host ops.
*/
static unsigned long mmc_get_min_frequency(struct mmc_host *host)
{
unsigned long freq;
if (host->ops && host->ops->get_min_frequency) {
freq = host->ops->get_min_frequency(host);
goto out;
}
switch (host->ios.timing) {
case MMC_TIMING_UHS_SDR50:
case MMC_TIMING_UHS_SDR104:
freq = UHS_SDR25_MAX_DTR;
break;
case MMC_TIMING_MMC_HS200:
freq = MMC_HIGH_52_MAX_DTR;
break;
case MMC_TIMING_MMC_HS400:
freq = MMC_HIGH_52_MAX_DTR;
break;
case MMC_TIMING_UHS_DDR50:
freq = UHS_DDR50_MAX_DTR / 2;
break;
default:
mmc_host_clk_hold(host);
freq = host->ios.clock;
mmc_host_clk_release(host);
break;
}
out:
return freq;
}
/*
* Scale down clocks to minimum frequency supported.
* The delayed work re-arms itself in case it cannot
* claim the host.
*/
static void mmc_clk_scale_work(struct work_struct *work)
{
struct mmc_host *host = container_of(work, struct mmc_host,
clk_scaling.work.work);
if (!host->card || !host->bus_ops ||
!host->bus_ops->change_bus_speed ||
!host->clk_scaling.enable || !host->ios.clock)
return;
mmc_rpm_hold(host, &host->card->dev);
if (!mmc_try_claim_host(host)) {
/* retry after a timer tick */
queue_delayed_work(system_nrt_wq, &host->clk_scaling.work, 1);
goto out;
}
mmc_clk_scaling(host, true);
mmc_release_host(host);
out:
mmc_rpm_release(host, &host->card->dev);
return;
}
static bool mmc_is_vaild_state_for_clk_scaling(struct mmc_host *host,
enum mmc_load state)
{
struct mmc_card *card = host->card;
u32 status;
bool ret = false;
/*
* If the current partition type is RPMB, clock switching may not
* work properly as sending tuning command (CMD21) is illegal in
* this mode.
*/
if (!card || (mmc_card_mmc(card) &&
card->part_curr == EXT_CSD_PART_CONFIG_ACC_RPMB)
|| (state != MMC_LOAD_LOW &&
host->clk_scaling.invalid_state))
goto out;
if (mmc_send_status(card, &status)) {
pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
goto out;
}
switch (R1_CURRENT_STATE(status)) {
case R1_STATE_TRAN:
ret = true;
break;
default:
break;
}
out:
return ret;
}
static int mmc_clk_update_freq(struct mmc_host *host,
unsigned long freq, enum mmc_load state)
{
int err = 0;
if (host->ops->notify_load) {
err = host->ops->notify_load(host, state);
if (err)
goto out;
}
if (freq != host->clk_scaling.curr_freq) {
if (!mmc_is_vaild_state_for_clk_scaling(host, state)) {
err = -EAGAIN;
pr_debug("%s: %s: invalid state_for_clk_scaling\n",
mmc_hostname(host), __func__);
goto error;
}
err = host->bus_ops->change_bus_speed(host, &freq);
if (!err)
host->clk_scaling.curr_freq = freq;
else
pr_err("%s: %s: failed (%d) at freq=%lu\n",
mmc_hostname(host), __func__, err, freq);
}
error:
if (err) {
/* restore previous state */
if (host->ops->notify_load)
host->ops->notify_load(host, host->clk_scaling.state);
}
out:
return err;
}
int mmc_cmdq_halt_on_empty_queue(struct mmc_host *host)
{
int err = 0;
while (host->cmdq_ctx.active_reqs) {
err = wait_io_event_interruptible(host->cmdq_ctx.queue_empty_wq,
(!host->cmdq_ctx.active_reqs));
if (host->cmdq_ctx.active_reqs)
continue;
}
err = mmc_cmdq_halt(host, true);
if (err) {
pr_err("%s: %s: mmc_cmdq_halt failed (%d)\n",
mmc_hostname(host), __func__, err);
goto out;
}
out:
return err;
}
EXPORT_SYMBOL(mmc_cmdq_halt_on_empty_queue);
/**
* mmc_clk_scaling() - clock scaling decision algorithm
* @host: pointer to mmc host structure
* @from_wq: variable that specifies the context in which
* mmc_clk_scaling() is called.
*
* Calculate load percentage based on host busy time
* and total sampling interval and decide clock scaling
* based on scale up/down thresholds.
* If load is greater than up threshold increase the
* frequency to maximum as supported by host. Else,
* if load is less than down threshold, scale down the
* frequency to minimum supported by the host. Otherwise,
* retain current frequency and do nothing.
*/
void mmc_clk_scaling(struct mmc_host *host, bool from_wq)
{
int err = 0;
struct mmc_card *card;
unsigned long total_time_ms = 0;
unsigned long busy_time_ms = 0;
unsigned long freq;
unsigned int up_threshold;
unsigned int down_threshold;
bool queue_scale_down_work = false;
enum mmc_load state;
bool cmdq_mode;
if (!host) {
pr_err("%s: invalid host\n", __func__);
goto out;
}
card = host->card;
up_threshold = host->clk_scaling.up_threshold;
down_threshold = host->clk_scaling.down_threshold;
if (!card || !host->bus_ops || !host->bus_ops->change_bus_speed) {
pr_err("%s: %s: invalid entry\n", mmc_hostname(host), __func__);
goto out;
}
cmdq_mode = !!mmc_card_cmdq(card);
/* Check if the clocks are already gated. */
if (!host->ios.clock)
goto out;
if (time_is_after_jiffies(host->clk_scaling.window_time +
msecs_to_jiffies(host->clk_scaling.polling_delay_ms)))
goto out;
if (cmdq_mode)
spin_lock_bh(&host->clk_scaling.lock);
if (host->clk_scaling.busy_time_us == 0) {
if (cmdq_mode)
spin_unlock_bh(&host->clk_scaling.lock);
goto out;
}
/* handle time wrap */
total_time_ms = jiffies_to_msecs((long)jiffies -
(long)host->clk_scaling.window_time);
/* Check if we re-enter during clock switching */
if (unlikely(host->clk_scaling.in_progress)) {
if (cmdq_mode)
spin_unlock_bh(&host->clk_scaling.lock);
goto out;
}
host->clk_scaling.in_progress = true;
busy_time_ms = host->clk_scaling.busy_time_us / USEC_PER_MSEC;
if (cmdq_mode)
spin_unlock_bh(&host->clk_scaling.lock);
freq = host->clk_scaling.curr_freq;
state = host->clk_scaling.state;
/*
* Note that the max. and min. frequency should be based
* on the timing modes that the card and host handshake
* during initialization.
*/
if ((busy_time_ms * 100 > total_time_ms * up_threshold)) {
freq = mmc_get_max_frequency(host);
state = MMC_LOAD_HIGH;
} else if ((busy_time_ms * 100 < total_time_ms * down_threshold)) {
if (!from_wq && !cmdq_mode)
queue_scale_down_work = true;
freq = mmc_get_min_frequency(host);
state = MMC_LOAD_LOW;
}
if (state != host->clk_scaling.state) {
if (!queue_scale_down_work) {
if (!from_wq)
cancel_delayed_work_sync(
&host->clk_scaling.work);
if (cmdq_mode) {
err = mmc_cmdq_halt_on_empty_queue(host);
if (err)
goto out;
}
pr_debug("%s: %s: scale, freq %ld, busy_time_ms=%ld\n",
mmc_hostname(host), __func__, freq,
busy_time_ms);
err = mmc_clk_update_freq(host, freq, state);
if (cmdq_mode) {
if (mmc_cmdq_halt(host, false))
pr_err("%s: %s: cmdq unhalt failed\n",
mmc_hostname(host), __func__);
}
if (!err)
host->clk_scaling.state = state;
else if (err == -EAGAIN)
goto no_reset_stats;
} else {
/*
* We hold claim host while queueing the scale down
* work, so delay atleast one timer tick to release
* host and re-claim while scaling down the clocks.
*/
queue_delayed_work(system_nrt_wq,
&host->clk_scaling.work, 1);
goto no_reset_stats;
}
}
mmc_reset_clk_scale_stats(host);
no_reset_stats:
host->clk_scaling.in_progress = false;
out:
return;
}
EXPORT_SYMBOL(mmc_clk_scaling);
/**
* mmc_disable_clk_scaling() - Disable clock scaling
* @host: pointer to mmc host structure
*
* Disables clock scaling temporarily by setting enable
* property to false. To disable completely, one also
* need to set 'initialized' variable to false.
*/
void mmc_disable_clk_scaling(struct mmc_host *host)
{
if (host->clk_scaling.enable &&
host->card && !mmc_card_cmdq(host->card))
cancel_delayed_work_sync(&host->clk_scaling.work);
if (host->ops->notify_load)
host->ops->notify_load(host, MMC_LOAD_LOW);
host->clk_scaling.enable = false;
}
EXPORT_SYMBOL_GPL(mmc_disable_clk_scaling);
/**
* mmc_can_scale_clk() - Check if clock scaling is initialized
* @host: pointer to mmc host structure
*/
bool mmc_can_scale_clk(struct mmc_host *host)
{
return host->clk_scaling.initialized;
}
EXPORT_SYMBOL_GPL(mmc_can_scale_clk);
/**
* mmc_init_clk_scaling() - Initialize clock scaling
* @host: pointer to mmc host structure
*
* Initialize clock scaling for supported hosts.
* It is assumed that the caller ensure clock is
* running at maximum possible frequency before
* calling this function.
*/
void mmc_init_clk_scaling(struct mmc_host *host)
{
if (!host->card || !(host->caps2 & MMC_CAP2_CLK_SCALE))
return;
INIT_DELAYED_WORK(&host->clk_scaling.work, mmc_clk_scale_work);
host->clk_scaling.curr_freq = mmc_get_max_frequency(host);
if (host->ops->notify_load)
host->ops->notify_load(host, MMC_LOAD_INIT);
host->clk_scaling.state = MMC_LOAD_INIT;
mmc_reset_clk_scale_stats(host);
host->clk_scaling.enable = true;
host->clk_scaling.initialized = true;
spin_lock_init(&host->clk_scaling.lock);
pr_debug("%s: clk scaling enabled\n", mmc_hostname(host));
}
EXPORT_SYMBOL_GPL(mmc_init_clk_scaling);
/**
* mmc_exit_clk_scaling() - Disable clock scaling
* @host: pointer to mmc host structure
*
* Disable clock scaling permanently.
*/
void mmc_exit_clk_scaling(struct mmc_host *host)
{
cancel_delayed_work_sync(&host->clk_scaling.work);
if (host->ops->notify_load)
host->ops->notify_load(host, MMC_LOAD_LOW);
memset(&host->clk_scaling, 0, sizeof(host->clk_scaling));
}
EXPORT_SYMBOL_GPL(mmc_exit_clk_scaling);
static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
{
host->f_init = freq;
#ifdef CONFIG_MMC_DEBUG
pr_info("%s: %s: trying to init card at %u Hz\n",
mmc_hostname(host), __func__, host->f_init);
#endif
mmc_power_up(host);
/*
* 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.
*/
sdio_reset(host);
mmc_go_idle(host);
mmc_send_if_cond(host, host->ocr_avail);
/* Order's important: probe SDIO, then SD, then MMC */
if (!mmc_attach_sdio(host))
return 0;
if (!mmc_attach_sd(host))
return 0;
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->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
return 0;
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));
ST_LOG("<%s> %s: card remove detected\n", __func__,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;
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) &&
!(host->caps2 & MMC_CAP2_DETECT_ON_ERR))
return ret;
host->detect_change = 0;
if (!ret) {
ret = _mmc_detect_card_removed(host);
if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) {
/*
* 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);
}
}
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);
bool extend_wakelock = false;
if (host->rescan_disable)
return;
/* If there is a non-removable card registered, only scan once */
if ((host->caps & MMC_CAP_NONREMOVABLE) && host->rescan_entered)
return;
host->rescan_entered = 1;
mmc_bus_get(host);
mmc_rpm_hold(host, &host->class_dev);
/*
* if there is a _removable_ card registered, check whether it is
* still present
*/
if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
&& !(host->caps & MMC_CAP_NONREMOVABLE))
host->bus_ops->detect(host);
host->detect_change = 0;
/* If the card was removed the bus will be marked
* as dead - extend the wakelock so userspace
* can respond */
if (host->bus_dead)
extend_wakelock = 1;
/*
* 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_rpm_release(host, &host->class_dev);
mmc_bus_put(host);
goto out;
}
mmc_rpm_release(host, &host->class_dev);
/*
* Only we can add a new handler, so it's safe to
* release the lock here.
*/
mmc_bus_put(host);
if (host->ops->get_cd && host->ops->get_cd(host) == 0) {
mmc_claim_host(host);
mmc_power_off(host);
mmc_release_host(host);
goto out;
}
#if !defined(CONFIG_SEC_HYBRID_TRAY)
ST_LOG("<%s> %s insertion detected",__func__,host->class_dev.kobj.name);
#endif
mmc_rpm_hold(host, &host->class_dev);
mmc_claim_host(host);
if (!mmc_rescan_try_freq(host, host->f_min))
extend_wakelock = true;
mmc_release_host(host);
mmc_rpm_release(host, &host->class_dev);
out:
/* only extend the wakelock, if suspend has not started yet */
if (extend_wakelock && !host->rescan_disable)
wake_lock_timeout(&host->detect_wake_lock, HZ / 2);
if (host->caps & MMC_CAP_NEEDS_POLL)
mmc_schedule_delayed_work(&host->detect, HZ);
}
void mmc_start_host(struct mmc_host *host)
{
mmc_claim_host(host);
host->f_init = max(freqs[0], host->f_min);
host->rescan_disable = 0;
if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
mmc_power_off(host);
else
mmc_power_up(host);
mmc_release_host(host);
mmc_detect_change(host, 0);
}
void mmc_stop_host(struct mmc_host *host)
{
#ifdef CONFIG_MMC_DEBUG
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
host->removed = 1;
spin_unlock_irqrestore(&host->lock, flags);
#endif
host->rescan_disable = 1;
cancel_delayed_work_sync(&host->detect);
mmc_flush_scheduled_work();
/* 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 */
if (host->bus_ops->remove)
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);
BUG_ON(host->card);
mmc_power_off(host);
}
int mmc_power_save_host(struct mmc_host *host)
{
int ret = 0;
#ifdef CONFIG_MMC_DEBUG
pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
#endif
mmc_bus_get(host);
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
mmc_bus_put(host);
return -EINVAL;
}
if (host->bus_ops->power_save)
ret = host->bus_ops->power_save(host);
mmc_bus_put(host);
mmc_power_off(host);
return ret;
}
EXPORT_SYMBOL(mmc_power_save_host);
int mmc_power_restore_host(struct mmc_host *host)
{
int ret;
#ifdef CONFIG_MMC_DEBUG
pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
#endif
mmc_bus_get(host);
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
mmc_bus_put(host);
return -EINVAL;
}
mmc_power_up(host);
mmc_claim_host(host);
ret = host->bus_ops->power_restore(host);
mmc_release_host(host);
mmc_bus_put(host);
return ret;
}
EXPORT_SYMBOL(mmc_power_restore_host);
int mmc_power_restore_broken_host(struct mmc_host *host)
{
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore)
return -EINVAL;
return host->bus_ops->power_restore(host);
}
EXPORT_SYMBOL(mmc_power_restore_broken_host);
int mmc_card_awake(struct mmc_host *host)
{
int err = -ENOSYS;
if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
return 0;
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
err = host->bus_ops->awake(host);
mmc_bus_put(host);
return err;
}
EXPORT_SYMBOL(mmc_card_awake);
int mmc_card_sleep(struct mmc_host *host)
{
int err = -ENOSYS;
if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
return 0;
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep)
err = host->bus_ops->sleep(host);
mmc_bus_put(host);
return err;
}
EXPORT_SYMBOL(mmc_card_sleep);
int mmc_card_can_sleep(struct mmc_host *host)
{
struct mmc_card *card = host->card;
if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
return 1;
return 0;
}
EXPORT_SYMBOL(mmc_card_can_sleep);
/*
* Flush the cache to the non-volatile storage.
*/
int mmc_flush_cache(struct mmc_card *card)
{
struct mmc_host *host = card->host;
int err = 0, rc;
if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
(card->quirks & MMC_QUIRK_CACHE_DISABLE))
return err;
if (mmc_card_mmc(card) &&
(card->ext_csd.cache_size > 0) &&
(card->ext_csd.cache_ctrl & 1)) {
err = mmc_switch_ignore_timeout(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_FLUSH_CACHE, 1,
MMC_FLUSH_REQ_TIMEOUT_MS);
if (err == -ETIMEDOUT) {
pr_err("%s: cache flush timeout\n",
mmc_hostname(card->host));
rc = mmc_interrupt_hpi(card);
if (rc) {
pr_err("%s: mmc_interrupt_hpi() failed (%d)\n",
mmc_hostname(host), rc);
err = -ENODEV;
}
} else if (err) {
pr_err("%s: cache flush error %d\n",
mmc_hostname(card->host), err);
}
}
return err;
}
EXPORT_SYMBOL(mmc_flush_cache);
#ifdef CONFIG_PM
/**
* mmc_suspend_host - suspend a host
* @host: mmc host
*/
int mmc_suspend_host(struct mmc_host *host)
{
int err = 0;
bool remove_pm_vote = false;
ktime_t start = ktime_get();
if (mmc_bus_needs_resume(host))
return 0;
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
if (host->ops->notify_pm_status)
host->ops->notify_pm_status(host, DEV_SUSPENDING);
/*
* Disable clock scaling before suspend and enable it after
* resume so as to avoid clock scaling decisions kicking in
* during this window.
*/
if (mmc_can_scale_clk(host))
mmc_disable_clk_scaling(host);
/*
* A long response time is not acceptable for device drivers
* when doing suspend. Prevent mmc_claim_host in the suspend
* sequence, to potentially wait "forever" by trying to
* pre-claim the host.
*
* Skip try claim host for SDIO cards, doing so fixes deadlock
* conditions. The function driver suspend may again call into
* SDIO driver within a different context for enabling power
* save mode in the card and hence wait in mmc_claim_host
* causing deadlock.
*/
if (!(host->card && mmc_card_sdio(host->card)))
if (!mmc_try_claim_host(host)) {
err = -EBUSY;
remove_pm_vote = true;
}
if (!err) {
if (host->bus_ops->suspend) {
if (host->card) {
err = mmc_stop_bkops(host->card);
if (err) {
remove_pm_vote = true;
goto out;
}
}
err = host->bus_ops->suspend(host);
if (err)
remove_pm_vote = true;
if (host->card)
MMC_UPDATE_BKOPS_STATS_SUSPEND(host->
card->bkops_info.bkops_stats);
}
if (!(host->card && mmc_card_sdio(host->card)))
mmc_release_host(host);
if (err == -ENOSYS || !host->bus_ops->resume) {
/*
* We simply "remove" the card in this case.
* It will be redetected on resume. (Calling
* bus_ops->remove() with a claimed host can
* deadlock.)
*/
if (host->bus_ops->remove)
host->bus_ops->remove(host);
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_power_off(host);
mmc_release_host(host);
host->pm_flags = 0;
err = 0;
}
}
}
mmc_bus_put(host);
if (!err && !mmc_card_keep_power(host)) {
mmc_claim_host(host);
mmc_power_off(host);
mmc_release_host(host);
}
if (err && mmc_can_scale_clk(host))
mmc_init_clk_scaling(host);
trace_mmc_suspend_host(mmc_hostname(host), err,
ktime_to_us(ktime_sub(ktime_get(), start)));
if (host->ops->notify_pm_status)
host->ops->notify_pm_status(host,
remove_pm_vote ? DEV_ERROR : DEV_SUSPENDED);
if (host->card && host->card->type == MMC_TYPE_SD)
mdelay(50);
return err;
out:
if (!(host->card && mmc_card_sdio(host->card)))
mmc_release_host(host);
if (host->ops->notify_pm_status)
host->ops->notify_pm_status(host,
remove_pm_vote ? DEV_ERROR : DEV_SUSPENDED);
return err;
}
EXPORT_SYMBOL(mmc_suspend_host);
/**
* mmc_resume_host - resume a previously suspended host
* @host: mmc host
*/
int mmc_resume_host(struct mmc_host *host)
{
int err = 0;
bool remove_pm_vote = false;
ktime_t start = ktime_get();
mmc_bus_get(host);
if (mmc_bus_manual_resume(host)) {
host->bus_resume_flags |= MMC_BUSRESUME_NEEDS_RESUME;
mmc_bus_put(host);
return 0;
}
if (host->bus_ops && !host->bus_dead) {
if (host->ops->notify_pm_status)
host->ops->notify_pm_status(host, DEV_RESUMING);
if (!mmc_card_keep_power(host)) {
mmc_claim_host(host);
mmc_power_up(host);
mmc_release_host(host);
mmc_select_voltage(host, host->ocr);
/*
* Tell runtime PM core we just powered up the card,
* since it still believes the card is powered off.
* Note that currently runtime PM is only enabled
* for SDIO cards that are MMC_CAP_POWER_OFF_CARD
*/
if (mmc_card_sdio(host->card) &&
(host->caps & MMC_CAP_POWER_OFF_CARD)) {
pm_runtime_disable(&host->card->dev);
pm_runtime_set_active(&host->card->dev);
pm_runtime_enable(&host->card->dev);
}
}
BUG_ON(!host->bus_ops->resume);
err = host->bus_ops->resume(host);
if (err) {
pr_warning("%s: error %d during resume "
"(card was removed?)\n",
mmc_hostname(host), err);
remove_pm_vote = true;
err = 0;
}
}
host->pm_flags &= ~MMC_PM_KEEP_POWER;
host->pm_flags &= ~MMC_PM_WAKE_SDIO_IRQ;
mmc_bus_put(host);
trace_mmc_resume_host(mmc_hostname(host), err,
ktime_to_us(ktime_sub(ktime_get(), start)));
if (host->ops->notify_pm_status)
host->ops->notify_pm_status(host,
remove_pm_vote ? DEV_ERROR : DEV_RESUMED);
return err;
}
EXPORT_SYMBOL(mmc_resume_host);
/* Do the card removal on suspend if card is assumed removeable
* Do that in pm notifier while userspace isn't yet frozen, so we will be able
to sync the card.
*/
int mmc_pm_notify(struct notifier_block *notify_block,
unsigned long mode, void *unused)
{
struct mmc_host *host = container_of(
notify_block, struct mmc_host, pm_notify);
unsigned long flags;
int err = 0;
switch (mode) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
if (host->card && mmc_card_mmc(host->card)) {
mmc_claim_host(host);
err = mmc_stop_bkops(host->card);
mmc_release_host(host);
if (err) {
pr_err("%s: didn't stop bkops\n",
mmc_hostname(host));
return err;
}
}
spin_lock_irqsave(&host->lock, flags);
if (mmc_bus_needs_resume(host)) {
spin_unlock_irqrestore(&host->lock, flags);
break;
}
/* since its suspending anyway, disable rescan */
host->rescan_disable = 1;
spin_unlock_irqrestore(&host->lock, flags);
/* Wait for pending detect work to be completed */
if (!(host->caps & MMC_CAP_NEEDS_POLL))
flush_work(&host->detect.work);
/*
* In some cases, the detect work might be scheduled
* just before rescan_disable is set to true.
* Cancel such the scheduled works.
*/
cancel_delayed_work_sync(&host->detect);
/*
* It is possible that the wake-lock has been acquired, since
* its being suspended, release the wakelock
*/
if (wake_lock_active(&host->detect_wake_lock))
wake_unlock(&host->detect_wake_lock);
if (!host->bus_ops || host->bus_ops->suspend)
break;
/* Calling bus_ops->remove() with a claimed host can deadlock */
if (host->bus_ops->remove)
host->bus_ops->remove(host);
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_power_off(host);
mmc_release_host(host);
host->pm_flags = 0;
break;
case PM_POST_SUSPEND:
case PM_POST_HIBERNATION:
case PM_POST_RESTORE:
spin_lock_irqsave(&host->lock, flags);
host->rescan_disable = 0;
if (mmc_bus_manual_resume(host)) {
spin_unlock_irqrestore(&host->lock, flags);
break;
}
spin_unlock_irqrestore(&host->lock, flags);
mmc_detect_change(host, 0);
break;
default:
return -EINVAL;
}
return 0;
}
#endif
#ifdef CONFIG_PM_RUNTIME
void mmc_dump_dev_pm_state(struct mmc_host *host, struct device *dev)
{
pr_err("%s: %s: err: runtime_error: %d\n", dev_name(dev),
mmc_hostname(host), dev->power.runtime_error);
pr_err("%s: %s: disable_depth: %d runtime_status: %d idle_notification: %d\n",
dev_name(dev), mmc_hostname(host), dev->power.disable_depth,
dev->power.runtime_status,
dev->power.idle_notification);
pr_err("%s: %s: request_pending: %d, request: %d\n",
dev_name(dev), mmc_hostname(host),
dev->power.request_pending, dev->power.request);
}
void mmc_rpm_hold(struct mmc_host *host, struct device *dev)
{
int ret = 0;
if (!mmc_use_core_runtime_pm(host))
return;
ret = pm_runtime_get_sync(dev);
if ((ret < 0) &&
(dev->power.runtime_error || (dev->power.disable_depth > 0))) {
pr_err("%s: %s: %s: pm_runtime_get_sync: err: %d\n",
dev_name(dev), mmc_hostname(host), __func__, ret);
mmc_dump_dev_pm_state(host, dev);
if (pm_runtime_suspended(dev))
BUG_ON(1);
}
}
EXPORT_SYMBOL(mmc_rpm_hold);
void mmc_rpm_release(struct mmc_host *host, struct device *dev)
{
int ret = 0;
if (!mmc_use_core_runtime_pm(host))
return;
ret = pm_runtime_put(dev);
if ((ret < 0) &&
(dev->power.runtime_error || (dev->power.disable_depth > 0))) {
pr_err("%s: %s: %s: pm_runtime_put_sync: err: %d\n",
dev_name(dev), mmc_hostname(host), __func__, ret);
mmc_dump_dev_pm_state(host, dev);
}
}
EXPORT_SYMBOL(mmc_rpm_release);
#else
void mmc_rpm_hold(struct mmc_host *host, struct device *dev) {}
EXPORT_SYMBOL(mmc_rpm_hold);
void mmc_rpm_release(struct mmc_host *host, struct device *dev) {}
EXPORT_SYMBOL(mmc_rpm_release);
#endif
/**
* mmc_init_context_info() - init synchronization context
* @host: mmc host
*
* Init struct context_info needed to implement asynchronous
* request mechanism, used by mmc core, host driver and mmc requests
* supplier.
*/
void mmc_init_context_info(struct mmc_host *host)
{
spin_lock_init(&host->context_info.lock);
host->context_info.is_new_req = false;
host->context_info.is_done_rcv = false;
host->context_info.is_waiting_last_req = false;
init_waitqueue_head(&host->context_info.wait);
}
#ifdef CONFIG_MMC_EMBEDDED_SDIO
void mmc_set_embedded_sdio_data(struct mmc_host *host,
struct sdio_cis *cis,
struct sdio_cccr *cccr,
struct sdio_embedded_func *funcs,
int num_funcs)
{
host->embedded_sdio_data.cis = cis;
host->embedded_sdio_data.cccr = cccr;
host->embedded_sdio_data.funcs = funcs;
host->embedded_sdio_data.num_funcs = num_funcs;
}
EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
#endif
static int __init mmc_init(void)
{
int ret;
workqueue = alloc_ordered_workqueue("kmmcd", 0);
if (!workqueue)
return -ENOMEM;
ret = mmc_register_bus();
if (ret)
goto destroy_workqueue;
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();
destroy_workqueue:
destroy_workqueue(workqueue);
return ret;
}
static void __exit mmc_exit(void)
{
sdio_unregister_bus();
mmc_unregister_host_class();
mmc_unregister_bus();
destroy_workqueue(workqueue);
}
subsys_initcall(mmc_init);
module_exit(mmc_exit);
MODULE_LICENSE("GPL");
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