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