target/linux/adm5120/files-2.6.26/arch/mips/adm5120/prom/myloader.c

   1 /*
   2  *  Compex's MyLoader 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
  18 #include <asm/bootinfo.h>
  19 #include <asm/addrspace.h>
  20 #include <asm/byteorder.h>
  21
  22 #include <asm/mach-adm5120/adm5120_defs.h>
  23 #include <prom/myloader.h>
  24 #include "prom_read.h"
  25
  26 #define SYS_PARAMS_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x0F000)
  27 #define BOARD_PARAMS_ADDR       KSEG1ADDR(ADM5120_SRAM0_BASE+0x0F800)
  28 #define PART_TABLE_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x10000)
  29
  30 static int myloader_found;
  31
  32 struct myloader_info myloader_info;
  33
  34 int __init myloader_present(void)
  35 {
  36         struct mylo_system_params *sysp;
  37         struct mylo_board_params *boardp;
  38         struct mylo_partition_table *parts;
  39
  40         if (myloader_found)
  41                 goto out;
  42
  43         sysp = (struct mylo_system_params *)(SYS_PARAMS_ADDR);
  44         boardp = (struct mylo_board_params *)(BOARD_PARAMS_ADDR);
  45         parts = (struct mylo_partition_table *)(PART_TABLE_ADDR);
  46
  47         /* Check for some magic numbers */
  48         if ((le32_to_cpu(sysp->magic) != MYLO_MAGIC_SYS_PARAMS) ||
  49            (le32_to_cpu(boardp->magic) != MYLO_MAGIC_BOARD_PARAMS) ||
  50            (le32_to_cpu(parts->magic) != MYLO_MAGIC_PARTITIONS))
  51                 goto out;
  52
  53         myloader_info.vid = le32_to_cpu(sysp->vid);
  54         myloader_info.did = le32_to_cpu(sysp->did);
  55         myloader_info.svid = le32_to_cpu(sysp->svid);
  56         myloader_info.sdid = le32_to_cpu(sysp->sdid);
  57
  58         myloader_found = 1;
  59
  60 out:
  61         return myloader_found;
  62 }