mmc: uniphier-sd: Add support for 64bit controller

The Renesas RCar Gen3 contains the same controller, originally
Matsushita, yet the register addresses are shifted by 1 to the
left. The whole controller is also 64bit, including the data
FIFOs and RSP registers. This patch adds support for handling
the register IO by shifting the register offset by 1 in the IO
accessor functions.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/mmc/uniphier-sd.c b/drivers/mmc/uniphier-sd.c
index f668223..0130892 100644 (file)
--- a/drivers/mmc/uniphier-sd.c
+++ b/drivers/mmc/uniphier-sd.c
@@ -132,17 +132,24 @@ struct uniphier_sd_priv {
 #define UNIPHIER_SD_CAP_NONREMOVABLE   BIT(0)  /* Nonremovable e.g. eMMC */
 #define UNIPHIER_SD_CAP_DMA_INTERNAL   BIT(1)  /* have internal DMA engine */
 #define UNIPHIER_SD_CAP_DIV1024                BIT(2)  /* divisor 1024 is available */
+#define UNIPHIER_SD_CAP_64BIT          BIT(3)  /* Controller is 64bit */
 };
 
 static u32 uniphier_sd_readl(struct uniphier_sd_priv *priv, const u32 reg)
 {
-       return readl(priv->regbase + reg);
+       if (priv->caps & UNIPHIER_SD_CAP_64BIT)
+               return readl(priv->regbase + (reg << 1));
+       else
+               return readl(priv->regbase + reg);
 }
 
 static void uniphier_sd_writel(struct uniphier_sd_priv *priv,
                               const u32 val, const u32 reg)
 {
-       writel(val, priv->regbase + reg);
+       if (priv->caps & UNIPHIER_SD_CAP_64BIT)
+               writel(val, priv->regbase + (reg << 1));
+       else
+               writel(val, priv->regbase + reg);
 }
 
 static dma_addr_t __dma_map_single(void *ptr, size_t size,