mmc: core: Move mmc bkops functions from core.c to mmc_ops.c

The mmc_start_bkops(), mmc_stop_bkops() and mmc_read_bkops_status()
functions are all specific to eMMCs. To make this clear, let's move them
from from core.c to mmc_ops.c and take the opportunity to make
mmc_read_bkops_status() static.

While moving them, get rid of MMC_BKOPS_MAX_TIMEOUT (4 min) and use the
common default timeout MMC_OPS_TIMEOUT_MS (10 min) instead, as there is no
need to have specific default timeout for bkops.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
This commit is contained in:
Ulf Hansson 2017-06-09 14:15:01 +02:00
parent 066d9cc546
commit 1cf8f7e5af
3 changed files with 113 additions and 119 deletions

View file

@ -53,12 +53,6 @@
/* 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 (4 * 60 * 1000) /* max time to wait in ms */
/* The max erase timeout, used when host->max_busy_timeout isn't specified */
#define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
@ -362,73 +356,6 @@ static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
return 0;
}
/**
* mmc_start_bkops - start BKOPS for supported cards
* @card: MMC card to start BKOPS
* @form_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;
int timeout;
bool use_busy_signal;
if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
return;
err = mmc_read_bkops_status(card);
if (err) {
pr_err("%s: Failed to read bkops status: %d\n",
mmc_hostname(card->host), err);
return;
}
if (!card->ext_csd.raw_bkops_status)
return;
if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
from_exception)
return;
mmc_claim_host(card->host);
if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
timeout = MMC_BKOPS_MAX_TIMEOUT;
use_busy_signal = true;
} else {
timeout = 0;
use_busy_signal = false;
}
mmc_retune_hold(card->host);
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BKOPS_START, 1, timeout, 0,
use_busy_signal, true, false);
if (err) {
pr_warn("%s: Error %d starting bkops\n",
mmc_hostname(card->host), err);
mmc_retune_release(card->host);
goto out;
}
/*
* For urgent bkops status (LEVEL_2 and more)
* bkops executed synchronously, otherwise
* the operation is in progress
*/
if (!use_busy_signal)
mmc_card_set_doing_bkops(card);
else
mmc_retune_release(card->host);
out:
mmc_release_host(card->host);
}
/*
* mmc_wait_data_done() - done callback for data request
* @mrq: done data request
@ -840,51 +767,6 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries
EXPORT_SYMBOL(mmc_wait_for_cmd);
/**
* 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.
*/
int mmc_stop_bkops(struct mmc_card *card)
{
int err = 0;
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);
mmc_retune_release(card->host);
err = 0;
}
return err;
}
int mmc_read_bkops_status(struct mmc_card *card)
{
int err;
u8 *ext_csd;
mmc_claim_host(card->host);
err = mmc_get_ext_csd(card, &ext_csd);
mmc_release_host(card->host);
if (err)
return err;
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];
kfree(ext_csd);
return 0;
}
/**
* mmc_set_data_timeout - set the timeout for a data command
* @data: data phase for command

View file

@ -19,6 +19,7 @@
#include <linux/mmc/mmc.h>
#include "core.h"
#include "card.h"
#include "host.h"
#include "mmc_ops.h"
@ -845,6 +846,118 @@ int mmc_can_ext_csd(struct mmc_card *card)
return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
}
/**
* 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.
*/
int mmc_stop_bkops(struct mmc_card *card)
{
int err = 0;
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);
mmc_retune_release(card->host);
err = 0;
}
return err;
}
static int mmc_read_bkops_status(struct mmc_card *card)
{
int err;
u8 *ext_csd;
mmc_claim_host(card->host);
err = mmc_get_ext_csd(card, &ext_csd);
mmc_release_host(card->host);
if (err)
return err;
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];
kfree(ext_csd);
return 0;
}
/**
* mmc_start_bkops - start BKOPS for supported cards
* @card: MMC card to start BKOPS
* @form_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;
int timeout;
bool use_busy_signal;
if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
return;
err = mmc_read_bkops_status(card);
if (err) {
pr_err("%s: Failed to read bkops status: %d\n",
mmc_hostname(card->host), err);
return;
}
if (!card->ext_csd.raw_bkops_status)
return;
if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
from_exception)
return;
mmc_claim_host(card->host);
if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
timeout = MMC_OPS_TIMEOUT_MS;
use_busy_signal = true;
} else {
timeout = 0;
use_busy_signal = false;
}
mmc_retune_hold(card->host);
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BKOPS_START, 1, timeout, 0,
use_busy_signal, true, false);
if (err) {
pr_warn("%s: Error %d starting bkops\n",
mmc_hostname(card->host), err);
mmc_retune_release(card->host);
goto out;
}
/*
* For urgent bkops status (LEVEL_2 and more)
* bkops executed synchronously, otherwise
* the operation is in progress
*/
if (!use_busy_signal)
mmc_card_set_doing_bkops(card);
else
mmc_retune_release(card->host);
out:
mmc_release_host(card->host);
}
static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
{
u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;

View file

@ -43,7 +43,6 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
unsigned int timeout_ms);
int mmc_stop_bkops(struct mmc_card *card);
int mmc_read_bkops_status(struct mmc_card *card);
void mmc_start_bkops(struct mmc_card *card, bool from_exception);
int mmc_can_reset(struct mmc_card *card);
int mmc_flush_cache(struct mmc_card *card);