diff --git a/drivers/mmc/sh_mmcif.h b/drivers/mmc/sh_mmcif.h
index bd6fbf7..70034e2 100644
--- a/drivers/mmc/sh_mmcif.h
+++ b/drivers/mmc/sh_mmcif.h
@@ -199,7 +199,8 @@
 #define SOFT_RST_OFF		(0 << 31)
 
 #define CLKDEV_EMMC_DATA	52000000	/* 52MHz */
-#define	CLKDEV_MMC_INIT		400000		/* 100 - 400 KHz */
+#define MMC_CLK_DIV_MIN(clk)	(clk / (1 << 8))
+#define MMC_CLK_DIV_MAX		CLKDEV_EMMC_DATA
 
 #define MMC_BUS_WIDTH_1		0
 #define MMC_BUS_WIDTH_4		2