diff options
| author | John Rigby <john.rigby@linaro.org> | 2011-12-16 15:50:05 -0700 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-12-06 12:16:42 -0700 |
| commit | ad235ea5f1c7c2ea00b6bfcb5203869984a5cbb8 (patch) | |
| tree | 4c08549447ff6a740feb596cab40387584d44b9a /arch/arm/cpu/armv7/omap-common | |
| parent | 5943fe4db34d5a5b2f8b265c8346a579512287d4 (diff) | |
OMAP4 Panda: Generate a unique usbethaddr
The panda board has a usb nic but the nic has no
rom. Use the die-id to generate a unique address.
This is derived from an RFC kernel patch by Andy Green
that does the same thing:
https://patchwork.kernel.org/patch/660541/
[RFC PATCH 1/2] OMAP2+: add cpu id register to MAC address helper
Signed-off-by: John Rigby <john.rigby@linaro.org>
Diffstat (limited to 'arch/arm/cpu/armv7/omap-common')
| -rw-r--r-- | arch/arm/cpu/armv7/omap-common/hwinit-common.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap-common/hwinit-common.c b/arch/arm/cpu/armv7/omap-common/hwinit-common.c index 9ef10bdf2..42b14edc6 100644 --- a/arch/arm/cpu/armv7/omap-common/hwinit-common.c +++ b/arch/arm/cpu/armv7/omap-common/hwinit-common.c @@ -29,6 +29,7 @@ */ #include <common.h> #include <spl.h> +#include <asm/io.h> #include <asm/arch/sys_proto.h> #include <asm/sizes.h> #include <asm/emif.h> @@ -252,6 +253,46 @@ int print_cpuinfo(void) return 0; } + +/* + * 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 omap4_die_id_to_ethernet_mac(u8 *mac, int subtype) +{ + struct ctrl_id *id_base = (struct ctrl_id *)(CTRL_BASE + 0x200); + u32 idcode; + u32 id[4]; + + idcode = readl(&id_base->idcode); + id[0] = readl(&id_base->die_id_0); + id[1] = readl(&id_base->die_id_1); + id[2] = readl(&id_base->die_id_2); + id[3] = readl(&id_base->die_id_3); + + mac[0] = id[2]; + mac[1] = id[2] >> 8; + mac[2] = id[1]; + mac[3] = id[1] >> 8; + mac[4] = id[1] >> 16; + mac[5] = id[1] >> 24; + /* XOR other chip-specific data with ID */ + idcode ^= id[3]; + + mac[0] ^= idcode; + mac[1] ^= idcode >> 8; + mac[2] ^= idcode >> 16; + mac[3] ^= idcode >> 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; +} + #ifndef CONFIG_SYS_DCACHE_OFF void enable_caches(void) { |