From: Josep Orga <jorga@somdevices.com>
Date: Thu, 7 Sep 2023 12:20:22 +0000 (+0200)
Subject: imx8mp-somdevices: Read MAC from EEPROM and save it in ethaddr environment variable.
X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.2~10
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=1d80903f5a1d63a33047ed1ec54c781886498984;p=u-boot.git

imx8mp-somdevices: Read MAC from EEPROM and save it in ethaddr environment variable.

Signed-off-by: Josep Orga <jorga@somdevices.com>
---

diff --git a/arch/arm/dts/imx8mp-somdevices.dts b/arch/arm/dts/imx8mp-somdevices.dts
index b2545f2c61..bebf28ad94 100644
--- a/arch/arm/dts/imx8mp-somdevices.dts
+++ b/arch/arm/dts/imx8mp-somdevices.dts
@@ -227,6 +227,11 @@
 			};
 		};
 	};
+
+	eeprom@50 {
+		compatible = "microchip,24c02";
+		reg = <0x50>;
+	};
 };
 
 &i2c2 {
diff --git a/board/somdevices/imx8mp_somdevices/imx8mp_somdevices.c b/board/somdevices/imx8mp_somdevices/imx8mp_somdevices.c
index fb5826a8c0..dd9aff6659 100644
--- a/board/somdevices/imx8mp_somdevices/imx8mp_somdevices.c
+++ b/board/somdevices/imx8mp_somdevices/imx8mp_somdevices.c
@@ -34,6 +34,10 @@ DECLARE_GLOBAL_DATA_PTR;
 
 #define UART_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_FSEL1)
 #define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_ODE | PAD_CTL_PUE | PAD_CTL_PE)
+#define EEPROM_BUS_NUM	0
+#define EEPROM_ADDR		0x50
+#define EEPROM_ADDR_LEN	1
+#define EEPROM_OFFSET	0xFA
 
 static iomux_v3_cfg_t const uart_pads[] = {
 	MX8MP_PAD_UART2_RXD__UART2_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
@@ -52,6 +56,67 @@ static void setup_gpmi_nand(void)
 }
 #endif
 
+int set_mac_eeprom(void)
+{
+	struct udevice *dev;
+	u8 buf[6];
+	int ret;
+	/* If ethaddr variable is not set in environment */
+	char ethaddr[18];
+	char *ethaddr_env;
+
+	/* Configure EEPROM: 7bit address 0x50 */
+	ret = i2c_get_chip_for_busnum(EEPROM_BUS_NUM, EEPROM_ADDR, EEPROM_ADDR_LEN, &dev);
+	if (ret) {
+		printf("Cannot find EEPROM for MAC: %d\n", ret);
+		return 0;
+	}
+	/* Reading from EEPROM */
+	if (dm_i2c_read(dev, EEPROM_OFFSET, (u8 *)&buf, sizeof(buf)) < 0) {
+		printf("i2c EEPROM for MAC read failed\n");
+		return 0;
+	}
+	sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
+						buf[0],
+						buf[1],
+						buf[2],
+						buf[3],
+						buf[4],
+						buf[5]);
+	ethaddr_env = env_get("ethaddr");
+	if (!ethaddr_env) {
+		printf("Setting MAC from EEPROM\n");
+		/* Set ethaddr variable for ethernet */
+		env_set("ethaddr", ethaddr);
+		sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
+				0x00,
+				0xaa,
+				buf[2],
+				buf[3],
+				buf[4],
+				buf[5]);
+		/* Set eth1addr variable for second ethernet */
+		env_set("eth1addr", ethaddr);
+		env_save();
+	} else {
+		if (strcmp(ethaddr_env, ethaddr)) {
+			/* Set ethaddr variable for ethernet */
+			env_set("ethaddr", ethaddr);
+			sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
+					0x00,
+					0xaa,
+					buf[2],
+					buf[3],
+					buf[4],
+					buf[5]);
+			/* Set eth1addr variable for second ethernet */
+			env_set("eth1addr", ethaddr);
+			env_save();
+		}
+	}
+	return 0;
+}
+
 int board_early_init_f(void)
 {
 	struct wdog_regs *wdog = (struct wdog_regs *)WDOG1_BASE_ADDR;
@@ -486,7 +551,7 @@ int board_late_init(void)
 	env_set("board_name", "SOMDEVICES");
 	env_set("board_rev", "iMX8MP");
 #endif
-
+	set_mac_eeprom();
 	return 0;
 }