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From 93b4f0bb46f9b9075bf830f2597816c3adeb01b7 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Thu, 24 Mar 2011 21:27:29 +0000
Subject: [PATCH 08/10] OMAP2+: add cpu id register to MAC address helper
Introduce a generic helper function that can set a MAC address using
data from the OMAP unique CPU ID register.
For comparison purposes this produces a MAC address of
2e:40:70:f0:12:06
for the ethernet device on my Panda.
Note that this patch requires the fix patch for CPU ID register
indexes previously posted to linux-omap, otherwise the CPU ID is
misread on Panda by the existing function to do it. This patch
is already on linux-omap.
"OMAP2+:Common CPU DIE ID reading code reads wrong registers for OMAP4430"
http://git.kernel.org/?p=linux/kernel/git/tmlind/linux-omap-2.6.git;a=commit;h=b235e007831dbf57710e59cd4a120e2f374eecb9
Signed-off-by: Andy Green <andy.green@linaro.org>
---
arch/arm/mach-omap2/id.c | 39 +++++++++++++++++++++++++++++++++
arch/arm/mach-omap2/include/mach/id.h | 1 +
2 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index b6ed78a..de993f1 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -567,3 +567,42 @@ 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;
+}
diff --git a/arch/arm/mach-omap2/include/mach/id.h b/arch/arm/mach-omap2/include/mach/id.h
index 02ed3aa..373313a 100644
--- a/arch/arm/mach-omap2/include/mach/id.h
+++ b/arch/arm/mach-omap2/include/mach/id.h
@@ -18,5 +18,6 @@ struct omap_die_id {
};
void omap_get_die_id(struct omap_die_id *odi);
+void omap2_die_id_to_ethernet_mac(u8 *mac, int subtype);
#endif
--
1.6.6.1
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