[Blackfin] arch: grab mac address from OTP on BF527-EZKIT

The bf527-ezkit stores the mac address in OTP,
so grab it from there rather than flash
Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>

arch/blackfin/mach-bf527/boards/ezkit.c

@@ -936,13 +936,18 @@ void native_machine_restart(char *cmd)
 		bfin_gpio_reset_spi0_ssel1();
 }
 
-/*
- * Currently the MAC address is saved in Flash by U-Boot
- */
-#define FLASH_MAC	0x203f0000
 void bfin_get_ether_addr(char *addr)
 {
-	*(u32 *)(&(addr[0])) = bfin_read32(FLASH_MAC);
-	*(u16 *)(&(addr[4])) = bfin_read16(FLASH_MAC + 4);
+	/* the MAC is stored in OTP memory page 0xDF */
+	u32 ret;
+	u64 otp_mac;
+	u32 (*otp_read)(u32 page, u32 flags, u64 *page_content) = (void *)0xEF00001A;
+
+	ret = otp_read(0xDF, 0x00, &otp_mac);
+	if (!(ret & 0x1)) {
+		char *otp_mac_p = (char *)&otp_mac;
+		for (ret = 0; ret < 6; ++ret)
+			addr[ret] = otp_mac_p[5 - ret];
+	}
 }
 EXPORT_SYMBOL(bfin_get_ether_addr);