imx: mx6sxsabresd: Add board support for USDHC2 and USDHC3

Add full support for USDHC2, USDHC3, USDHC4 on mx6sx sabresd board.
The default boot socket is USDHC4, so the MMC environment device and
mmcdev variable are set to this device.
Signed-off-by: NYe.Li <B37916@freescale.com>

board/freescale/mx6sxsabresd/mx6sxsabresd.c

@@ -68,6 +68,34 @@ static iomux_v3_cfg_t const uart1_pads[] = {
 	MX6_PAD_GPIO1_IO05__UART1_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
 };
 
+static iomux_v3_cfg_t const usdhc2_pads[] = {
+	MX6_PAD_SD2_CLK__USDHC2_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD2_CMD__USDHC2_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD2_DATA0__USDHC2_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD2_DATA1__USDHC2_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD2_DATA2__USDHC2_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD2_DATA3__USDHC2_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+};
+
+static iomux_v3_cfg_t const usdhc3_pads[] = {
+	MX6_PAD_SD3_CLK__USDHC3_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_CMD__USDHC3_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA0__USDHC3_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA1__USDHC3_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA2__USDHC3_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA3__USDHC3_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA4__USDHC3_DATA4 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA5__USDHC3_DATA5 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA6__USDHC3_DATA6 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD3_DATA7__USDHC3_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+
+	/* CD pin */
+	MX6_PAD_KEY_COL0__GPIO2_IO_10 | MUX_PAD_CTRL(NO_PAD_CTRL),
+
+	/* RST_B, used for power reset cycle */
+	MX6_PAD_KEY_COL1__GPIO2_IO_11 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
 static iomux_v3_cfg_t const usdhc4_pads[] = {
 	MX6_PAD_SD4_CLK__USDHC4_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
 	MX6_PAD_SD4_CMD__USDHC4_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
@@ -249,23 +277,84 @@ int board_early_init_f(void)
 	return 0;
 }
 
-static struct fsl_esdhc_cfg usdhc_cfg[1] = {
+static struct fsl_esdhc_cfg usdhc_cfg[3] = {
+	{USDHC2_BASE_ADDR, 0, 4},
+	{USDHC3_BASE_ADDR},
 	{USDHC4_BASE_ADDR},
 };
 
+#define USDHC3_CD_GPIO	IMX_GPIO_NR(2, 10)
+#define USDHC3_PWR_GPIO	IMX_GPIO_NR(2, 11)
+#define USDHC4_CD_GPIO	IMX_GPIO_NR(6, 21)
+
 int board_mmc_getcd(struct mmc *mmc)
 {
-	return 1;	/* Assume boot SD always present */
+	struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
+	int ret = 0;
+
+	switch (cfg->esdhc_base) {
+	case USDHC2_BASE_ADDR:
+		ret = 1; /* Assume uSDHC2 is always present */
+		break;
+	case USDHC3_BASE_ADDR:
+		ret = !gpio_get_value(USDHC3_CD_GPIO);
+		break;
+	case USDHC4_BASE_ADDR:
+		ret = !gpio_get_value(USDHC4_CD_GPIO);
+		break;
+	}
+
+	return ret;
 }
 
 int board_mmc_init(bd_t *bis)
 {
-	imx_iomux_v3_setup_multiple_pads(usdhc4_pads, ARRAY_SIZE(usdhc4_pads));
+	int i, ret;
 
-	usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC4_CLK);
-	return fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
+	/*
+	 * According to the board_mmc_init() the following map is done:
+	 * (U-boot device node)    (Physical Port)
+	 * mmc0                    USDHC2
+	 * mmc1                    USDHC3
+	 * mmc2                    USDHC4
+	 */
+	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
+		switch (i) {
+		case 0:
+			imx_iomux_v3_setup_multiple_pads(
+				usdhc2_pads, ARRAY_SIZE(usdhc2_pads));
+			usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
+			break;
+		case 1:
+			imx_iomux_v3_setup_multiple_pads(
+				usdhc3_pads, ARRAY_SIZE(usdhc3_pads));
+			gpio_direction_input(USDHC3_CD_GPIO);
+			gpio_direction_output(USDHC3_PWR_GPIO, 1);
+			usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
+			break;
+		case 2:
+			imx_iomux_v3_setup_multiple_pads(
+				usdhc4_pads, ARRAY_SIZE(usdhc4_pads));
+			gpio_direction_input(USDHC4_CD_GPIO);
+			usdhc_cfg[2].sdhc_clk = mxc_get_clock(MXC_ESDHC4_CLK);
+			break;
+		default:
+			printf("Warning: you configured more USDHC controllers"
+				"(%d) than supported by the board\n", i + 1);
+			return -EINVAL;
+			}
+
+			ret = fsl_esdhc_initialize(bis, &usdhc_cfg[i]);
+			if (ret) {
+				printf("Warning: failed to initialize mmc dev %d\n", i);
+				return ret;
+			}
+	}
+
+	return 0;
 }
 
+
 int board_init(void)
 {
 	/* Address of boot parameters */

include/configs/mx6sxsabresd.h

@@ -59,7 +59,7 @@
 	"fdt_addr=0x88000000\0" \
 	"boot_fdt=try\0" \
 	"ip_dyn=yes\0" \
-	"mmcdev=0\0" \
+	"mmcdev=2\0" \
 	"mmcpart=1\0" \
 	"mmcroot=/dev/mmcblk0p2 rootwait rw\0" \
 	"mmcargs=setenv bootargs console=${console},${baudrate} " \
@@ -214,7 +214,6 @@
 #define CONFIG_ENV_OFFSET		(6 * SZ_64K)
 #define CONFIG_ENV_SIZE			SZ_8K
 #define CONFIG_ENV_IS_IN_MMC
-#define CONFIG_SYS_MMC_ENV_DEV		0
 
 #define CONFIG_OF_LIBFDT
 #define CONFIG_CMD_BOOTZ
@@ -223,4 +222,9 @@
 #define CONFIG_CMD_CACHE
 #endif
 
+#define CONFIG_SYS_FSL_USDHC_NUM	3
+#if defined(CONFIG_ENV_IS_IN_MMC)
+#define CONFIG_SYS_MMC_ENV_DEV		2  /*USDHC4*/
+#endif
+
 #endif				/* __CONFIG_H */