ot1200: add support for usdhc4

On the 'mr' variant switching to 'mmc dev 1' will result
in "MMC: no card present".
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>

board/bachmann/ot1200/ot1200.c

@@ -141,23 +141,67 @@ static iomux_v3_cfg_t const usdhc3_pads[] = {
 	MX6_PAD_SD3_RST__SD3_RESET | MUX_PAD_CTRL(USDHC_PAD_CTRL),
 };
 
+iomux_v3_cfg_t const usdhc4_pads[] = {
+	MX6_PAD_SD4_CLK__SD4_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD4_CMD__SD4_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD4_DAT0__SD4_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD4_DAT1__SD4_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD4_DAT2__SD4_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD4_DAT3__SD4_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+};
+
 int board_mmc_getcd(struct mmc *mmc)
 {
-	return 1;
+	struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
+	int ret;
+
+	if (cfg->esdhc_base == USDHC3_BASE_ADDR)
+		ret = 1;
+	else {
+		gpio_direction_input(IMX_GPIO_NR(1, 4));
+		ret = !gpio_get_value(IMX_GPIO_NR(1, 4));
+	}
+
+	return ret;
 }
 
-struct fsl_esdhc_cfg usdhc_cfg[] = {
+struct fsl_esdhc_cfg usdhc_cfg[2] = {
 	{USDHC3_BASE_ADDR},
+	{USDHC4_BASE_ADDR},
 };
 
 int board_mmc_init(bd_t *bis)
 {
+	s32 status = 0;
+	u32 index = 0;
+
 	usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
-	usdhc_cfg[0].max_bus_width = 8;
+	usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC4_CLK);
 
-	imx_iomux_v3_setup_multiple_pads(usdhc3_pads, ARRAY_SIZE(usdhc3_pads));
+	usdhc_cfg[0].max_bus_width = 8;
+	usdhc_cfg[1].max_bus_width = 4;
+
+	for (index = 0; index < CONFIG_SYS_FSL_USDHC_NUM; ++index) {
+		switch (index) {
+		case 0:
+			imx_iomux_v3_setup_multiple_pads(
+				usdhc3_pads, ARRAY_SIZE(usdhc3_pads));
+			break;
+		case 1:
+			imx_iomux_v3_setup_multiple_pads(
+				usdhc4_pads, ARRAY_SIZE(usdhc4_pads));
+			break;
+		default:
+			printf("Warning: you configured more USDHC controllers"
+				"(%d) then supported by the board (%d)\n",
+				index + 1, CONFIG_SYS_FSL_USDHC_NUM);
+			return status;
+		}
+
+		status |= fsl_esdhc_initialize(bis, &usdhc_cfg[index]);
+	}
 
-	return fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
+	return status;
 }
 
 #define PC MUX_PAD_CTRL(I2C_PAD_CTRL)