[PATCH] mmc: core: Move eMMC cache flushing to a new bus_ops callback
From: Ulf Hansson
Date: Mon Apr 19 2021 - 08:29:55 EST
To prepare to add internal cache management for SD cards, let's start by
moving the eMMC specific code into a new ->flush_cache() bus_ops callback.
In this way, it becomes more straight-forward to add the SD specific parts,
as subsequent changes are about to show.
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
drivers/mmc/core/core.c | 11 +++++++++++
drivers/mmc/core/core.h | 2 ++
drivers/mmc/core/mmc.c | 25 +++++++++++++++++++++++--
drivers/mmc/core/mmc_ops.c | 23 -----------------------
drivers/mmc/core/mmc_ops.h | 1 -
5 files changed, 36 insertions(+), 26 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index f194940c5974..64eb3c8f0d15 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2044,6 +2044,17 @@ int mmc_sw_reset(struct mmc_host *host)
}
EXPORT_SYMBOL(mmc_sw_reset);
+int mmc_flush_cache(struct mmc_card *card)
+{
+ const struct mmc_bus_ops *bus_ops = card->host->bus_ops;
+
+ if (bus_ops->flush_cache)
+ return bus_ops->flush_cache(card);
+
+ return 0;
+}
+EXPORT_SYMBOL(mmc_flush_cache);
+
static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
{
host->f_init = freq;
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 8032451abaea..b00012f14671 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -20,6 +20,7 @@ struct mmc_request;
struct mmc_bus_ops {
void (*remove)(struct mmc_host *);
void (*detect)(struct mmc_host *);
+ int (*flush_cache)(struct mmc_card *);
int (*pre_suspend)(struct mmc_host *);
int (*suspend)(struct mmc_host *);
int (*resume)(struct mmc_host *);
@@ -98,6 +99,7 @@ bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq);
int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq);
+int mmc_flush_cache(struct mmc_card *card);
int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
unsigned int arg);
int mmc_can_erase(struct mmc_card *card);
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 8741271d3971..77c9ca024285 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -28,6 +28,7 @@
#define DEFAULT_CMD6_TIMEOUT_MS 500
#define MIN_CACHE_EN_TIMEOUT_MS 1600
+#define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */
static const unsigned int tran_exp[] = {
10000, 100000, 1000000, 10000000,
@@ -2029,6 +2030,25 @@ static void mmc_detect(struct mmc_host *host)
}
}
+/*
+ * Flush the internal cache of the eMMC to non-volatile storage.
+ */
+static int _mmc_flush_cache(struct mmc_card *card)
+{
+ int err = 0;
+
+ if (card->ext_csd.cache_size > 0 && card->ext_csd.cache_ctrl & 1) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_FLUSH_CACHE, 1,
+ CACHE_FLUSH_TIMEOUT_MS);
+ if (err)
+ pr_err("%s: cache flush error %d\n",
+ mmc_hostname(card->host), err);
+ }
+
+ return err;
+}
+
static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
{
int err = 0;
@@ -2040,7 +2060,7 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
if (mmc_card_suspended(host->card))
goto out;
- err = mmc_flush_cache(host->card);
+ err = _mmc_flush_cache(host->card);
if (err)
goto out;
@@ -2181,7 +2201,7 @@ static int _mmc_hw_reset(struct mmc_host *host)
* In the case of recovery, we can't expect flushing the cache to work
* always, but we have a go and ignore errors.
*/
- mmc_flush_cache(host->card);
+ _mmc_flush_cache(host->card);
if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
mmc_can_reset(card)) {
@@ -2201,6 +2221,7 @@ static int _mmc_hw_reset(struct mmc_host *host)
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
.detect = mmc_detect,
+ .flush_cache = _mmc_flush_cache,
.suspend = mmc_suspend,
.resume = mmc_resume,
.runtime_suspend = mmc_runtime_suspend,
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index f413474f0f80..b03e3cf5dab4 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -20,7 +20,6 @@
#include "mmc_ops.h"
#define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */
-#define MMC_CACHE_FLUSH_TIMEOUT_MS (30 * 1000) /* 30s */
#define MMC_SANITIZE_TIMEOUT_MS (240 * 1000) /* 240s */
static const u8 tuning_blk_pattern_4bit[] = {
@@ -960,28 +959,6 @@ void mmc_run_bkops(struct mmc_card *card)
}
EXPORT_SYMBOL(mmc_run_bkops);
-/*
- * Flush the cache to the non-volatile storage.
- */
-int mmc_flush_cache(struct mmc_card *card)
-{
- int err = 0;
-
- if (mmc_card_mmc(card) &&
- (card->ext_csd.cache_size > 0) &&
- (card->ext_csd.cache_ctrl & 1)) {
- err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_FLUSH_CACHE, 1,
- MMC_CACHE_FLUSH_TIMEOUT_MS);
- if (err)
- pr_err("%s: cache flush error %d\n",
- mmc_hostname(card->host), err);
- }
-
- return err;
-}
-EXPORT_SYMBOL(mmc_flush_cache);
-
static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
{
u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index 632009260e51..c155ff7b9989 100644
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -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);
void mmc_run_bkops(struct mmc_card *card);
-int mmc_flush_cache(struct mmc_card *card);
int mmc_cmdq_enable(struct mmc_card *card);
int mmc_cmdq_disable(struct mmc_card *card);
int mmc_sanitize(struct mmc_card *card);
--
2.25.1