From d10037e976ddcf4fda9d25bce4e00429d05f0c8b Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Thu, 17 Dec 2020 08:26:42 +0100
Subject: [PATCH] board: amlogic: vim3: read ethernet MAC address from efuse

Add the board specific code for reading built-in ethernet MAC address
from efuse.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 board/amlogic/vim3/vim3.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/board/amlogic/vim3/vim3.c b/board/amlogic/vim3/vim3.c
index 09ef39ff30..a36df61583 100644
--- a/board/amlogic/vim3/vim3.c
+++ b/board/amlogic/vim3/vim3.c
@@ -11,6 +11,7 @@
 #include <net.h>
 #include <asm/io.h>
 #include <asm/arch/eth.h>
+#include <asm/arch/sm.h>
 #include <i2c.h>
 #include "khadas-mcu.h"
 
@@ -129,9 +130,27 @@ int meson_ft_board_setup(void *blob, struct bd_info *bd)
 	return 0;
 }
 
+#define EFUSE_MAC_OFFSET	0
+#define EFUSE_MAC_SIZE		6
+
 int misc_init_r(void)
 {
+	uint8_t mac_addr[EFUSE_MAC_SIZE];
+	ssize_t len;
+
 	meson_eth_init(PHY_INTERFACE_MODE_RGMII, 0);
 
+	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
+		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
+					  mac_addr, EFUSE_MAC_SIZE);
+		if (len != EFUSE_MAC_SIZE)
+			return 0;
+
+		if (is_valid_ethaddr(mac_addr))
+			eth_env_set_enetaddr("ethaddr", mac_addr);
+		else
+			meson_generate_serial_ethaddr();
+	}
+
 	return 0;
 }