OMAP3: tam3517: add function to read MAC from EEPROM

The manufacturer delivers the TAM3517 SOM with 4 MAC address.
They are stored on the EEPROM of the SOM. The patch adds a
function to get their values and set the ethaddr variables.

Signed-off-by: Stefano Babic <sbabic@denx.de>

include/configs/tam3517-common.h

@@ -124,6 +124,7 @@
 #define CONFIG_CMD_NAND		/* NAND support			*/
 #define CONFIG_CMD_PING
 #define CONFIG_CMD_USB
+#define CONFIG_CMD_EEPROM
 
 #undef CONFIG_CMD_FLASH		/* only NAND on the SOM */
 #undef CONFIG_CMD_IMLS
@@ -134,6 +135,9 @@
 #define CONFIG_SYS_I2C_SLAVE		1
 #define CONFIG_SYS_I2C_BUS		0
 #define CONFIG_SYS_I2C_BUS_SELECT	1
+#define CONFIG_SYS_I2C_EEPROM_ADDR	0x50		/* base address */
+#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN	1		/* bytes of address */
+#define CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW	0x07
 #define CONFIG_DRIVER_OMAP34XX_I2C
 
 
@@ -347,4 +351,66 @@
 		"fi;"							\
 		"else echo U-Boot not downloaded..exiting;fi\0"		\
 
+
+/*
+ * this is common code for all TAM3517 boards.
+ * MAC address is stored from manufacturer in
+ * I2C EEPROM
+ */
+#if !(defined(__KERNEL_STRICT_NAMES) || defined(__ASSEMBLY__))
+
+/*
+ * The I2C EEPROM on the TAM3517 contains
+ * mac address and production data
+ */
+struct tam3517_module_info {
+	char customer[48];
+	char product[48];
+
+	/*
+	 * bit 0~47  : sequence number
+	 * bit 48~55 : week of year, from 0.
+	 * bit 56~63 : year
+	 */
+	unsigned long long sequence_number;
+
+	/*
+	 * bit 0~7   : revision fixed
+	 * bit 8~15  : revision major
+	 * bit 16~31 : TNxxx
+	 */
+	unsigned int revision;
+	unsigned char eth_addr[4][8];
+	unsigned char _rev[100];
+};
+
+#define TAM3517_READ_MAC_FROM_EEPROM	\
+do {					\
+	struct tam3517_module_info info;\
+	char buf[80], ethname[20];	\
+	int i;				\
+	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);	\
+	if (eeprom_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,		\
+			(void *)&info, sizeof(info)))		\
+		break;						\
+	memset(buf, 0, sizeof(buf));				\
+	for (i = 0 ; i < ARRAY_SIZE(info.eth_addr); i++) {	\
+		sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",	\
+			info.eth_addr[i][5],			\
+			info.eth_addr[i][4],			\
+			info.eth_addr[i][3],			\
+			info.eth_addr[i][2],			\
+			info.eth_addr[i][1],			\
+			info.eth_addr[i][0]);			\
+								\
+		if (i)						\
+			sprintf(ethname, "eth%daddr", i);	\
+		else						\
+			sprintf(ethname, "ethaddr");		\
+		printf("Setting %s from EEPROM with %s\n", ethname, buf);\
+		setenv(ethname, buf);				\
+	}							\
+} while (0)
+#endif
+
 #endif /* __TAM3517_H */