[PATCH] mmc: sdhci-of-esdhc: support ESDHC_CAPABILITIES_1 accessing

[Yangbo Lu <yangbo.lu@nxp.com>]

eSDHC is not a standard SD host controller. SDHCI_CAPABILITIES_1
register address is 0x44 while it's 0x114 (ESDHC_CAPABILITIES_1)
for eSDHC.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
Changes for v2:
	- Removed duplicate perenthesis.
	- Added "Acked-by: Adrian Hunter".
---
 drivers/mmc/host/sdhci-esdhc.h    |  3 +++
 drivers/mmc/host/sdhci-of-esdhc.c | 23 +++++++++++++++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
index e7893f2..dfa58f8 100644
--- a/drivers/mmc/host/sdhci-esdhc.h
+++ b/drivers/mmc/host/sdhci-esdhc.h
@@ -54,6 +54,9 @@
 #define ESDHC_CLOCK_HCKEN		0x00000002
 #define ESDHC_CLOCK_IPGEN		0x00000001
 
+/* Host Controller Capabilities Register 2 */
+#define ESDHC_CAPABILITIES_1		0x114
+
 /* Tuning Block Control Register */
 #define ESDHC_TBCTL			0x120
 #define ESDHC_TB_EN			0x00000004
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 44b016b..d96a057 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -86,6 +86,17 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host,
 		return ret;
 	}
 
+	/*
+	 * DTS properties of mmc host are used to enable each speed mode
+	 * according to soc and board capability. So clean up
+	 * SDR50/SDR104/DDR50 support bits here.
+	 */
+	if (spec_reg == SDHCI_CAPABILITIES_1) {
+		ret = value & ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
+				SDHCI_SUPPORT_DDR50);
+		return ret;
+	}
+
 	ret = value;
 	return ret;
 }
@@ -249,7 +260,11 @@ static u32 esdhc_be_readl(struct sdhci_host *host, int reg)
 	u32 ret;
 	u32 value;
 
-	value = ioread32be(host->ioaddr + reg);
+	if (reg == SDHCI_CAPABILITIES_1)
+		value = ioread32be(host->ioaddr + ESDHC_CAPABILITIES_1);
+	else
+		value = ioread32be(host->ioaddr + reg);
+
 	ret = esdhc_readl_fixup(host, reg, value);
 
 	return ret;
@@ -260,7 +275,11 @@ static u32 esdhc_le_readl(struct sdhci_host *host, int reg)
 	u32 ret;
 	u32 value;
 
-	value = ioread32(host->ioaddr + reg);
+	if (reg == SDHCI_CAPABILITIES_1)
+		value = ioread32(host->ioaddr + ESDHC_CAPABILITIES_1);
+	else
+		value = ioread32(host->ioaddr + reg);
+
 	ret = esdhc_readl_fixup(host, reg, value);
 
 	return ret;
-- 
2.1.0.27.g96db324