mmc: sh_mmcif: Add support rmobile

Renesas R-Mobile/R-Car ARM SoC of MMC has the same IP that are supported by
sh_mmcif. This adds support R-Mobile/R-Car ARM SoC with the setting of the
clock support.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

drivers/mmc/sh_mmcif.c

@@ -596,7 +596,7 @@ int mmcif_mmc_init(void)
 	host->clk = CONFIG_SH_MMCIF_CLK;
 
 	sh_mmcif_cfg.f_min = MMC_CLK_DIV_MIN(host->clk);
-	sh_mmcif_cfg.f_max = MMC_CLK_DIV_MAX;
+	sh_mmcif_cfg.f_max = MMC_CLK_DIV_MAX(host->clk);
 
 	mmc = mmc_create(&sh_mmcif_cfg, host);
 	if (mmc == NULL) {

drivers/mmc/sh_mmcif.h

@@ -199,8 +199,13 @@ struct sh_mmcif_regs {
 #define SOFT_RST_OFF		(0 << 31)
 
 #define CLKDEV_EMMC_DATA	52000000	/* 52MHz */
+#ifdef CONFIG_RMOBILE
+#define MMC_CLK_DIV_MIN(clk)	(clk / (1 << 9))
+#define MMC_CLK_DIV_MAX(clk)	(clk / (1 << 1))
+#else
 #define MMC_CLK_DIV_MIN(clk)	(clk / (1 << 8))
-#define MMC_CLK_DIV_MAX		CLKDEV_EMMC_DATA
+#define MMC_CLK_DIV_MAX(clk)	CLKDEV_EMMC_DATA
+#endif
 
 #define MMC_BUS_WIDTH_1		0
 #define MMC_BUS_WIDTH_4		2