mmc: sh_mmcif: Change maximum and minimum value of MMC clock

Maximum value and the minimum value of clock for sh_mmcif instead by
base of MMC clock. This removes fixed clock, make the changes to be calculated
according to environment.

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

drivers/mmc/sh_mmcif.c

@@ -579,8 +579,6 @@ static struct mmc_config sh_mmcif_cfg = {
 	.host_caps	= MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT |
 			  MMC_MODE_8BIT | MMC_MODE_HC,
 	.voltages	= MMC_VDD_32_33 | MMC_VDD_33_34,
-	.f_min		= CLKDEV_MMC_INIT,
-	.f_max		= CLKDEV_EMMC_DATA,
 	.b_max		= CONFIG_SYS_MMC_MAX_BLK_COUNT,
 };
 
@@ -597,6 +595,9 @@ int mmcif_mmc_init(void)
 	host->regs = (struct sh_mmcif_regs *)CONFIG_SH_MMCIF_ADDR;
 	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;
+
 	mmc = mmc_create(&sh_mmcif_cfg, host);
 	if (mmc == NULL) {
 		free(host);

drivers/mmc/sh_mmcif.h

@@ -199,7 +199,8 @@ struct sh_mmcif_regs {
 #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