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

   1 /*
   2  *  Mikrotik's RouterBOOT specific prom routines
   3  *
   4  *  Copyright (C) 2007-2008 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/autoconf.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/string.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/bootinfo.h>
  20 #include <asm/addrspace.h>
  21
  22 #include <asm/mach-adm5120/adm5120_defs.h>
  23 #include <prom/routerboot.h>
  24 #include "prom_read.h"
  25
  26 struct rb_hard_settings rb_hs;
  27 static int rb_found;
  28
  29 static int __init routerboot_load_hs(u8 *buf, u16 buflen)
  30 {
  31         u16 id, len;
  32
  33         memset(&rb_hs, 0, sizeof(rb_hs));
  34
  35         if (buflen < 4)
  36                 return -1;
  37
  38         if (prom_read_le32(buf) != RB_MAGIC_HARD)
  39                 return -1;
  40
  41         /* skip magic value */
  42         buf += 4;
  43         buflen -= 4;
  44
  45         while (buflen > 2) {
  46                 id = prom_read_le16(buf);
  47                 buf += 2;
  48                 buflen -= 2;
  49                 if (id == RB_ID_TERMINATOR || buflen < 2)
  50                         break;
  51
  52                 len = prom_read_le16(buf);
  53                 buf += 2;
  54                 buflen -= 2;
  55
  56                 if (buflen < len)
  57                         break;
  58
  59                 switch (id) {
  60                 case RB_ID_BIOS_VERSION:
  61                         rb_hs.bios_ver = (char *)buf;
  62                         break;
  63                 case RB_ID_BOARD_NAME:
  64                         rb_hs.name = (char *)buf;
  65                         break;
  66                 case RB_ID_MEMORY_SIZE:
  67                         rb_hs.mem_size = prom_read_le32(buf);
  68                         break;
  69                 case RB_ID_MAC_ADDRESS_COUNT:
  70                         rb_hs.mac_count = prom_read_le32(buf);
  71                         break;
  72                 case RB_ID_MAC_ADDRESS_PACK:
  73                         if ((len / RB_MAC_SIZE) > 0)
  74                                 rb_hs.mac_base = buf;
  75                         break;
  76                 }
  77
  78                 buf += len;
  79                 buflen -= len;
  80
  81         }
  82
  83         return 0;
  84 }
  85
  86 #define RB_BS_OFFS      0x14
  87 #define RB_OFFS_MAX     (128*1024)
  88
  89 int __init routerboot_present(void)
  90 {
  91         struct rb_bios_settings *bs;
  92         u8 *base;
  93         u32 off, len;
  94
  95         if (rb_found)
  96                 goto out;
  97
  98         base = (u8 *)KSEG1ADDR(ADM5120_SRAM0_BASE);
  99         bs = (struct rb_bios_settings *)(base + RB_BS_OFFS);
 100
 101         off = prom_read_le32(&bs->hs_offs);
 102         len = prom_read_le32(&bs->hs_size);
 103         if (off > RB_OFFS_MAX)
 104                 goto out;
 105
 106         if (routerboot_load_hs(base+off, len) != 0)
 107                 goto out;
 108
 109         rb_found = 1;
 110
 111 out:
 112         return rb_found;
 113 }
 114
 115 char *routerboot_get_boardname(void)
 116 {
 117         if (rb_found == 0)
 118                 return NULL;
 119
 120         return rb_hs.name;
 121 }