[PATCH] mmc: core: Move eMMC cache flushing to a new bus_ops callback

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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




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