target/linux/adm5120/files/arch/mips/adm5120/prom/admboot.c

   1 /*
   2  *  ADMBoot specific prom routines
   3  *
   4  *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/init.h>
  14 #include <linux/errno.h>
  15
  16 #include <asm/addrspace.h>
  17 #include <asm/byteorder.h>
  18
  19 #include <asm/mach-adm5120/adm5120_defs.h>
  20 #include <prom/admboot.h>
  21 #include "prom_read.h"
  22
  23 #define ADMBOOT_MAGIC_MAC_BASE  0x636D676D      /* 'mgmc' */
  24
  25 int __init admboot_get_mac_base(u32 offset, u32 len, u8 *mac)
  26 {
  27         u8 *cfg;
  28         int i;
  29
  30         cfg = (u8 *) KSEG1ADDR(ADM5120_SRAM0_BASE + offset);
  31         for (i = 0; i < len; i += 4) {
  32                 u32 magic;
  33
  34                 magic = prom_read_le32(cfg + i);
  35                 if (magic == ADMBOOT_MAGIC_MAC_BASE) {
  36                         int j;
  37
  38                         for (j = 0; j < 6; j++)
  39                                 mac[j] = cfg[i + 4 + j];
  40
  41                         return 0;
  42                 }
  43         }
  44
  45         return -ENXIO;
  46 }