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

   1 /*
   2  *  $Id$
   3  *
   4  *  Compex's MyLoader 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 modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  *
  13  */
  14
  15 #include <linux/types.h>
  16 #include <linux/autoconf.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/string.h>
  20
  21 #include <asm/bootinfo.h>
  22 #include <asm/addrspace.h>
  23 #include <asm/byteorder.h>
  24
  25 #include <adm5120_defs.h>
  26 #include <prom/myloader.h>
  27 #include "prom_read.h"
  28
  29 #define SYS_PARAMS_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x0F000)
  30 #define BOARD_PARAMS_ADDR       KSEG1ADDR(ADM5120_SRAM0_BASE+0x0F800)
  31 #define PART_TABLE_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x10000)
  32
  33 static int myloader_found;
  34
  35 struct myloader_info myloader_info;
  36
  37 int __init myloader_present(void)
  38 {
  39         struct mylo_system_params *sysp;
  40         struct mylo_board_params *boardp;
  41         struct mylo_partition_table *parts;
  42
  43         if (myloader_found)
  44                 goto out;
  45
  46         sysp = (struct mylo_system_params *)(SYS_PARAMS_ADDR);
  47         boardp = (struct mylo_board_params *)(BOARD_PARAMS_ADDR);
  48         parts = (struct mylo_partition_table *)(PART_TABLE_ADDR);
  49
  50         /* Check for some magic numbers */
  51         if ((le32_to_cpu(sysp->magic) != MYLO_MAGIC_SYS_PARAMS) ||
  52            (le32_to_cpu(boardp->magic) != MYLO_MAGIC_BOARD_PARAMS) ||
  53            (le32_to_cpu(parts->magic) != MYLO_MAGIC_PARTITIONS))
  54                 goto out;
  55
  56         myloader_info.vid = le32_to_cpu(sysp->vid);
  57         myloader_info.did = le32_to_cpu(sysp->did);
  58         myloader_info.svid = le32_to_cpu(sysp->svid);
  59         myloader_info.sdid = le32_to_cpu(sysp->sdid);
  60
  61         myloader_found = 1;
  62
  63 out:
  64         return myloader_found;
  65 }