target/linux/adm5120-2.6/files/arch/mips/adm5120/prom/routerboot.c

   1 /*
   2  *  $Id$
   3  *
   4  *  Mikrotik's RouterBOOT specific prom routines
   5  *
   6  *  Copyright (C) 2007 OpenWrt.org
   7  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   8  *
   9  *  This program is free software; you can redistribute it and/or
  10  *  modify it under the terms of the GNU General Public License
  11  *  as published by the Free Software Foundation; either version 2
  12  *  of the License, or (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the
  21  *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22  *  Boston, MA  02110-1301, USA.
  23  */
  24
  25 #include <linux/types.h>
  26 #include <linux/autoconf.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30
  31 #include <asm/bootinfo.h>
  32 #include <asm/addrspace.h>
  33
  34 #include <adm5120_defs.h>
  35 #include <prom/routerboot.h>
  36 #include "prom_read.h"
  37
  38 static struct rb_hard_settings rb_hs;
  39 static int rb_found = 0;
  40
  41 static int __init routerboot_load_hs(u8 *buf, u16 buflen)
  42 {
  43         u16 id,len;
  44         u8 *mac;
  45         int i,j;
  46
  47         memset(&rb_hs, 0, sizeof(rb_hs));
  48
  49         if (buflen < 4)
  50                 return -1;
  51
  52         if (prom_read_le32(buf) != RB_MAGIC_HARD)
  53                 return -1;
  54
  55         /* skip magic value */
  56         buf += 4;
  57         buflen -= 4;
  58
  59         while (buflen > 2) {
  60                 id = prom_read_le16(buf);
  61                 buf += 2;
  62                 buflen -= 2;
  63                 if (id == RB_ID_TERMINATOR || buflen < 2)
  64                         break;
  65
  66                 len = prom_read_le16(buf);
  67                 buf += 2;
  68                 buflen -= 2;
  69
  70                 if (buflen < len)
  71                         break;
  72
  73                 switch (id) {
  74                 case RB_ID_BIOS_VERSION:
  75                         rb_hs.bios_ver = (char *)buf;
  76                         break;
  77                 case RB_ID_BOARD_NAME:
  78                         rb_hs.name = (char *)buf;
  79                         break;
  80                 case RB_ID_MEMORY_SIZE:
  81                         rb_hs.mem_size = prom_read_le32(buf);
  82                         break;
  83                 case RB_ID_MAC_ADDRESS_COUNT:
  84                         rb_hs.mac_count = prom_read_le32(buf);
  85                         break;
  86                 case RB_ID_MAC_ADDRESS_PACK:
  87                         rb_hs.mac_count = len/RB_MAC_SIZE;
  88                         if (rb_hs.mac_count > RB_MAX_MAC_COUNT)
  89                                 rb_hs.mac_count = RB_MAX_MAC_COUNT;
  90                         mac = buf;
  91                         for (i=0; i < rb_hs.mac_count; i++) {
  92                                 for (j=0; j < RB_MAC_SIZE; j++)
  93                                         rb_hs.macs[i][j] = mac[j];
  94                                 mac += RB_MAC_SIZE;
  95                         }
  96                         break;
  97                 }
  98
  99                 buf += len;
 100                 buflen -= len;
 101
 102         }
 103
 104         return 0;
 105 }
 106
 107 #define RB_BS_OFFS      0x14
 108 #define RB_OFFS_MAX     (128*1024)
 109
 110 int __init routerboot_present(void)
 111 {
 112         struct rb_bios_settings *bs;
 113         u8 *base;
 114         u32 off,len;
 115
 116         if (rb_found)
 117                 goto out;
 118
 119         base = (u8 *)KSEG1ADDR(ADM5120_SRAM0_BASE);
 120         bs = (struct rb_bios_settings *)(base + RB_BS_OFFS);
 121
 122         off = prom_read_le32(&bs->hs_offs);
 123         len = prom_read_le32(&bs->hs_size);
 124         if (off > RB_OFFS_MAX)
 125                 goto out;
 126
 127         if (routerboot_load_hs(base+off, len) != 0)
 128                 goto out;
 129
 130         rb_found = 1;
 131
 132 out:
 133         return rb_found;
 134 }
 135
 136 char *routerboot_get_boardname(void)
 137 {
 138         if (rb_found == 0)
 139                 return NULL;
 140
 141         return rb_hs.name;
 142 }