[PATCH 1/6] sdhci: Enable cache snooping

[Gao Guanhua]

This patch enable cache snooping when the sdhc is initialized.
---
 drivers/mmc/host/sdhci.c |    3 +++
 drivers/mmc/host/sdhci.h |    4 ++++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 288e40b..cc6d45c 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -178,6 +178,9 @@ static void sdhci_init(struct sdhci_host *host)
 {
 	sdhci_reset(host, SDHCI_RESET_ALL);
 
+	/* Enable cache snooping */
+	sdhci_writel(host, SDHCI_CACHE_SNOOP, SDHCI_HOST_DMA_CONTROL);
+
 	sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
 		SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 		SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index afda7f1..9ee9622 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -176,6 +176,10 @@
 #define   SDHCI_SPEC_100	0
 #define   SDHCI_SPEC_200	1
 
+/* 40C DMA control register*/
+#define SDHCI_HOST_DMA_CONTROL	0x40C
+#define SDHCI_CACHE_SNOOP	0x40
+
 struct sdhci_ops;
 
 struct sdhci_host {
-- 
1.6.4