mmc: sh_sdhi: Add SDHI support

R-Car Gen3 series have four SD card interfaces (SDHI0 to SDHI3),
two of which can also be used as MMC interfaces (SDHI2 and SDHI3).
This adds High-speed mode SD clock frequency between 25MHz and 50MHz,
8bit/4bit bus width, high capacity and low voltage device support.

Signed-off-by: Kouei Abe <kouei.abe.cp@renesas.com>
Cc: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

drivers/mmc/sh_sdhi.c

@@ -698,6 +698,19 @@ static const struct mmc_ops sh_sdhi_ops = {
 	.init           = sh_sdhi_initialize,
 };
 
+#ifdef CONFIG_RCAR_GEN3
+static struct mmc_config sh_sdhi_cfg = {
+	.name           = DRIVER_NAME,
+	.ops            = &sh_sdhi_ops,
+	.f_min          = CLKDEV_INIT,
+	.f_max          = CLKDEV_HS_DATA,
+	.voltages       = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34,
+	.host_caps      = MMC_MODE_4BIT | MMC_MODE_8BIT | MMC_MODE_HS |
+			  MMC_MODE_HS_52MHz,
+	.part_type      = PART_TYPE_DOS,
+	.b_max          = CONFIG_SYS_MMC_MAX_BLK_COUNT,
+};
+#else
 static struct mmc_config sh_sdhi_cfg = {
 	.name           = DRIVER_NAME,
 	.ops            = &sh_sdhi_ops,
@@ -708,6 +721,7 @@ static struct mmc_config sh_sdhi_cfg = {
 	.part_type      = PART_TYPE_DOS,
 	.b_max          = CONFIG_SYS_MMC_MAX_BLK_COUNT,
 };
+#endif
 
 int sh_sdhi_init(unsigned long addr, int ch, unsigned long quirks)
 {