target/linux/adm5120/files-3.14/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 #define ADMBOOT_MAGIC_MAC_BASE_BR6104XX 0x31305348      /* 'HS01' */
  25
  26 int __init admboot_get_mac_base(u32 offset, u32 len, u8 *mac)
  27 {
  28         u8 *cfg;
  29         int i;
  30
  31         cfg = (u8 *) KSEG1ADDR(ADM5120_SRAM0_BASE + offset);
  32         for (i = 0; i < len; i += 4) {
  33                 u32 magic;
  34
  35                 magic = prom_read_le32(cfg + i);
  36                 if (magic == ADMBOOT_MAGIC_MAC_BASE) {
  37                         int j;
  38
  39                         for (j = 0; j < 6; j++)
  40                                 mac[j] = cfg[i + 4 + j];
  41
  42                         return 0;
  43                 }
  44                 if (magic == ADMBOOT_MAGIC_MAC_BASE_BR6104XX) {
  45                         int j;
  46
  47                         for (j = 0; j < 6; j++)
  48                                 mac[j] = cfg[i + 7 + j];
  49
  50                         return 0;
  51                 }
  52         }
  53
  54         return -ENXIO;
  55 }