snapdragon: added MAC generation functions

Add support for generation of unique MAC address
that is derived from board serial.
Algorithm for generation of MAC taken from LK.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>

arch/arm/mach-snapdragon/include/mach/misc.h

@@ -8,5 +8,6 @@
 #define MISC_H
 
 u32 msm_board_serial(void);
+void msm_generate_mac_addr(u8 *mac);
 
 #endif

arch/arm/mach-snapdragon/misc.c

@@ -35,3 +35,19 @@ u32 msm_board_serial(void)
 
 	return UNSTUFF_BITS(mmc_dev->cid, 16, 32);
 }
+
+void msm_generate_mac_addr(u8 *mac)
+{
+	int i;
+	char sn[9];
+
+	snprintf(sn, 8, "%08x", msm_board_serial());
+
+	/* fill in the mac with serialno, use locally adminstrated pool */
+	mac[0] = 0x02;
+	mac[1] = 00;
+	for (i = 3; i >= 0; i--) {
+		mac[i + 2] = simple_strtoul(&sn[2 * i], NULL, 16);
+		sn[2 * i] = 0;
+	}
+}