[PATCH 2/7] ARM: i.MX: karo-tx6: Support eMMC board variants

[Sascha Hauer]

The TX6 board come with either NAND flash or eMMC as primary
storage medium. This adds support for the eMMC variants.
We can detect if we have NAND or eMMC by looking at the
bootsource which will be configured accordingly. This
way we can modify the device tree during runtime and do
not have to create a new image.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 arch/arm/boards/karo-tx6x/board.c | 26 +++++++++++++++++++++++++-
 arch/arm/dts/imx6qdl-tx6x.dtsi    | 31 +++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boards/karo-tx6x/board.c b/arch/arm/boards/karo-tx6x/board.c
index a921541..346c4b9 100644
--- a/arch/arm/boards/karo-tx6x/board.c
+++ b/arch/arm/boards/karo-tx6x/board.c
@@ -183,8 +183,13 @@ static void eth_init(void)
 	writel(val, iomux + IOMUXC_GPR1);
 }
 
+#define IMX6_SRC_SBMR1   0x04
+
 static int tx6x_devices_init(void)
 {
+	void __iomem *src_base = IOMEM(MX6_SRC_BASE_ADDR);
+	uint32_t sbmr1;
+
 	if (!of_machine_is_compatible("karo,imx6dl-tx6dl") &&
 	    !of_machine_is_compatible("karo,imx6q-tx6q"))
 		return 0;
@@ -195,7 +200,26 @@ static int tx6x_devices_init(void)
 
 	setup_pmic_voltages();
 
-	imx6_bbu_nand_register_handler("nand", BBU_HANDLER_FLAG_DEFAULT);
+	sbmr1 = readl(src_base + IMX6_SRC_SBMR1);
+
+	/*
+	 * Check if this board is booted from eMMC or NAND to enable the
+	 * corresponding device. We can't use the regular bootsource
+	 * function here as it might return that we are in serial
+	 * downloader mode. Even if we are SBMR1[7] indicates whether
+	 * this board has eMMC or NAND.
+	 */
+	if (sbmr1 & (1 << 7)) {
+		imx6_bbu_nand_register_handler("nand", BBU_HANDLER_FLAG_DEFAULT);
+		of_device_enable_and_register_by_name("environment-nand");
+		of_device_enable_and_register_by_name("gpmi-nand at 00112000");
+	} else {
+		imx6_bbu_internal_mmc_register_handler("eMMC", "/dev/mmc3.boot0",
+						       BBU_HANDLER_FLAG_DEFAULT);
+		of_device_enable_and_register_by_name("environment-emmc");
+		of_device_enable_and_register_by_name("usdhc at 0219c000");
+	}
+
 
 	return 0;
 }
diff --git a/arch/arm/dts/imx6qdl-tx6x.dtsi b/arch/arm/dts/imx6qdl-tx6x.dtsi
index 7584e43..9fe6e6a 100644
--- a/arch/arm/dts/imx6qdl-tx6x.dtsi
+++ b/arch/arm/dts/imx6qdl-tx6x.dtsi
@@ -3,9 +3,16 @@
 		linux,stdout-path = &uart1;
 
 		environment-nand {
+			status = "disabled";
 			compatible = "barebox,environment";
 			device-path = &gpmi, "partname:barebox-environment";
 		};
+
+		environment-emmc {
+			status = "disabled";
+			compatible = "barebox,environment";
+			device-path = &usdhc4, "partname:boot1";
+		};
 	};
 };
 
@@ -14,6 +21,8 @@
 };
 
 &gpmi {
+	status = "disabled";
+
 	partition at 0 {
 		label = "barebox";
 		reg = <0x0 0x400000>;
@@ -51,9 +60,31 @@
 				MX6QDL_PAD_GPIO_16__ENET_REF_CLK	0x4001b0b0
 			>;
 		};
+
+		pinctrl_usdhc4: usdhc4grp {
+			fsl,pins = <
+				MX6QDL_PAD_SD4_CMD__SD4_CMD		0x070b1
+				MX6QDL_PAD_SD4_CLK__SD4_CLK		0x070b1
+				MX6QDL_PAD_SD4_DAT0__SD4_DATA0		0x070b1
+				MX6QDL_PAD_SD4_DAT1__SD4_DATA1		0x070b1
+				MX6QDL_PAD_SD4_DAT2__SD4_DATA2		0x070b1
+				MX6QDL_PAD_SD4_DAT3__SD4_DATA3		0x070b1
+				MX6QDL_PAD_NANDF_ALE__SD4_RESET		0x0b0b1
+			>;
+		};
 	};
 };
 
 &ocotp {
 	barebox,provide-mac-address = <&fec 0x620>;
 };
+
+&usdhc4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_usdhc4>;
+	bus-width = <4>;
+	non-removable;
+	no-1-8-v;
+	fsl,wp-controller;
+	status = "disabled";
+};
-- 
2.7.0