[ARM] 4886/1: Orion: grab ts209 ethernet MAC address from flash

The bootloader on ts209 Orion boards doesn't configure the right
ethernet MAC address into the GigE unit on boot.  The only way to
get the MAC address is by parsing it from the 'NAS Config' flash
partition, which is an ext2 partition that contains a file which
holds the MAC address in plain text (format "xx:xx:xx:xx:xx:xx\n")
-- this patch does that.
Tested-by: Martin Michlmayr <tbm@cyrius.com>

Cc: Byron Bradley <byron.bbradley@gmail.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-orion5x/ts209-setup.c

@@ -188,6 +188,87 @@ static struct mv643xx_eth_platform_data qnap_ts209_eth_data = {
 	.force_phy_addr = 1,
 };
 
+static int __init parse_hex_nibble(char n)
+{
+	if (n >= '0' && n <= '9')
+		return n - '0';
+
+	if (n >= 'A' && n <= 'F')
+		return n - 'A' + 10;
+
+	if (n >= 'a' && n <= 'f')
+		return n - 'a' + 10;
+
+	return -1;
+}
+
+static int __init parse_hex_byte(const char *b)
+{
+	int hi;
+	int lo;
+
+	hi = parse_hex_nibble(b[0]);
+	lo = parse_hex_nibble(b[1]);
+
+	if (hi < 0 || lo < 0)
+		return -1;
+
+	return (hi << 4) | lo;
+}
+
+static int __init check_mac_addr(const char *addr_str)
+{
+	u_int8_t addr[6];
+	int i;
+
+	for (i = 0; i < 6; i++) {
+		int byte;
+
+		/*
+		 * Enforce "xx:xx:xx:xx:xx:xx\n" format.
+		 */
+		if (addr_str[(i * 3) + 2] != ((i < 5) ? ':' : '\n'))
+			return -1;
+
+		byte = parse_hex_byte(addr_str + (i * 3));
+		if (byte < 0)
+			return -1;
+		addr[i] = byte;
+	}
+
+	printk(KERN_INFO "ts209: found ethernet mac address ");
+	for (i = 0; i < 6; i++)
+		printk("%.2x%s", addr[i], (i < 5) ? ":" : ".\n");
+
+	memcpy(qnap_ts209_eth_data.mac_addr, addr, 6);
+
+	return 0;
+}
+
+/*
+ * The 'NAS Config' flash partition has an ext2 filesystem which
+ * contains a file that has the ethernet MAC address in plain text
+ * (format "xx:xx:xx:xx:xx:xx\n".)
+ */
+static void __init ts209_find_mac_addr(void)
+{
+	unsigned long addr;
+
+	for (addr = 0x00700000; addr < 0x00760000; addr += 1024) {
+		char *nor_page;
+		int ret = 0;
+
+		nor_page = ioremap(QNAP_TS209_NOR_BOOT_BASE + addr, 1024);
+		if (nor_page != NULL) {
+			ret = check_mac_addr(nor_page);
+			iounmap(nor_page);
+		}
+
+		if (ret == 0)
+			break;
+	}
+}
+
 /*****************************************************************************
  * RTC S35390A on I2C bus
  ****************************************************************************/
@@ -342,7 +423,9 @@ static void __init qnap_ts209_init(void)
 		pr_warning("qnap_ts209_init: failed to get RTC IRQ\n");
 	i2c_register_board_info(0, &qnap_ts209_i2c_rtc, 1);
 
+	ts209_find_mac_addr();
 	orion5x_eth_init(&qnap_ts209_eth_data);
+
 	orion5x_sata_init(&qnap_ts209_sata_data);
 }