On 06/29/12 17:05, the mail apparently from Tony Lindgren included:
* Andy Green <andy.gr...@linaro.org> [120628 22:59]:
Introduce a generic helper function that can generate a valid MAC
address using data from the OMAP unique CPU ID register.
...
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -530,3 +530,42 @@ void __init omap2_set_globals_tap(struct omap_globals
*omap2_globals)
else
tap_prod_id = 0x0208;
}
+
+/*
+ * this uses the unique per-cpu info from the cpu fuses set at factory to
+ * generate a 6-byte MAC address. Two bits in the generated code are used
+ * to elaborate the generated address into four, so it can be used on multiple
+ * network interfaces.
+ */
+
+void omap2_die_id_to_ethernet_mac(u8 *mac, int subtype)
+{
+ struct omap_die_id odi;
+ u32 tap = read_tap_reg(OMAP_TAP_IDCODE);
+
+ omap_get_die_id(&odi);
+
+ mac[0] = odi.id_2;
+ mac[1] = odi.id_2 >> 8;
+ mac[2] = odi.id_1;
+ mac[3] = odi.id_1 >> 8;
+ mac[4] = odi.id_1 >> 16;
+ mac[5] = odi.id_1 >> 24;
+
+ /* XOR other chip-specific data with ID */
+
+ tap ^= odi.id_3;
+
+ mac[0] ^= tap;
+ mac[1] ^= tap >> 8;
+ mac[2] ^= tap >> 16;
+ mac[3] ^= tap >> 24;
+
+ /* allow four MACs from this same basic data */
+
+ mac[1] = (mac[1] & ~0xc0) | ((subtype & 3) << 6);
+
+ /* mark it as not multicast, and outside official 80211 MAC namespace */
+
+ mac[0] = (mac[0] & ~1) | 2;
+}
Let's just make this omap_die_id_to_ethernet_mac, no need to keep the
omap2 naming there as this should not conflict with any omap1 stuff.
Okay, will do thanks.
-Andy
--
Andy Green | TI Landing Team Leader
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