mmc: sdhci-of-esdhc: Access Freescale eSDHC registers as 32-bit

Freescale eSDHC registers only support 32-bit accesses, this patch
ensures that all Freescale eSDHC register accesses are 32-bit.

Signed-off-by: Xu lei <B33228@freescale.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-of-esdhc.c

@@ -1,7 +1,7 @@
 /*
  * Freescale eSDHC controller driver.
  *
- * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ * Copyright (c) 2007, 2010 Freescale Semiconductor, Inc.
  * Copyright (c) 2009 MontaVista Software, Inc.
  *
  * Authors: Xiaobo Xie <X.Xie@freescale.com>
@@ -22,11 +22,21 @@
 static u16 esdhc_readw(struct sdhci_host *host, int reg)
 {
 	u16 ret;
+	int base = reg & ~0x3;
+	int shift = (reg & 0x2) * 8;
 
 	if (unlikely(reg == SDHCI_HOST_VERSION))
-		ret = in_be16(host->ioaddr + reg);
+		ret = in_be32(host->ioaddr + base) & 0xffff;
 	else
-		ret = sdhci_be32bs_readw(host, reg);
+		ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
+	return ret;
+}
+
+static u8 esdhc_readb(struct sdhci_host *host, int reg)
+{
+	int base = reg & ~0x3;
+	int shift = (reg & 0x3) * 8;
+	u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;
 	return ret;
 }
 
@@ -74,7 +84,7 @@ static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
 static struct sdhci_ops sdhci_esdhc_ops = {
 	.read_l = sdhci_be32bs_readl,
 	.read_w = esdhc_readw,
-	.read_b = sdhci_be32bs_readb,
+	.read_b = esdhc_readb,
 	.write_l = sdhci_be32bs_writel,
 	.write_w = esdhc_writew,
 	.write_b = esdhc_writeb,