diff options
Diffstat (limited to 'arch/arm/cpu/armv7/omap4/sys_info.c')
| -rw-r--r-- | arch/arm/cpu/armv7/omap4/sys_info.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap4/sys_info.c b/arch/arm/cpu/armv7/omap4/sys_info.c index b9e57659f..7800d180a 100644 --- a/arch/arm/cpu/armv7/omap4/sys_info.c +++ b/arch/arm/cpu/armv7/omap4/sys_info.c @@ -23,6 +23,7 @@ */ #include <common.h> +#include <asm/io.h> #include <asm/arch/sys_proto.h> /* @@ -51,3 +52,43 @@ 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; +} |