target/linux/brcm63xx-2.6/files/arch/mips/bcm963xx/info.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (C) 2007 OpenWrt.org
   5  * Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
   6  * Copyright (C) 2007 Florian Fainelli <florian@openwrt.org>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/autoconf.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19
  20 #include <asm/bootinfo.h>
  21 #include <asm/addrspace.h>
  22 #include <asm/string.h>
  23 #include <asm/mach-bcm963xx/bootloaders.h>
  24
  25 static char *boot_loader_names[BOOT_LOADER_LAST+1] = {
  26         [BOOT_LOADER_UNKNOWN]   = "Unknown",
  27         [BOOT_LOADER_CFE]       = "CFE",
  28         [BOOT_LOADER_REDBOOT]   = "RedBoot"
  29 };
  30
  31 /* boot loaders specific definitions */
  32 #define CFE_EPTSEAL     0x43464531 /* CFE1 is the magic number to recognize CFE from other bootloaders */
  33
  34 int boot_loader_type;
  35 /*
  36  * Boot loader detection routines
  37  */
  38 static int __init detect_cfe(void)
  39 {
  40         /*
  41          * This method only works, when we are booted directly from the CFE.
  42          */
  43         uint32_t cfe_handle = (uint32_t) fw_arg0;
  44         uint32_t cfe_a1_val = (uint32_t) fw_arg1;
  45         uint32_t cfe_entry = (uint32_t) fw_arg2;
  46         uint32_t cfe_seal = (uint32_t) fw_arg3;
  47
  48         /* Check for CFE by finding the CFE magic number */
  49         if (cfe_seal != CFE_EPTSEAL)
  50                 /* We are not booted from CFE */
  51                 return 0;
  52
  53         /* cfe_a1_val must be 0, because only one CPU present in the ADM5120 SoC */
  54         if (cfe_a1_val != 0)
  55                 return 0;
  56
  57         /* The cfe_handle, and the cfe_entry must be kernel mode addresses */
  58         if ((cfe_handle < KSEG0) || (cfe_entry < KSEG0))
  59                 return 0;
  60
  61         return 1;
  62 }
  63
  64 static int __init detect_redboot(void)
  65 {
  66         /* On Inventel Livebox, the boot loader is passed as a command line argument, check for it */
  67         if (!strncmp(arcs_cmdline, "boot_loader=RedBoot", 19))
  68                 return 1;
  69         return 0;
  70 }
  71
  72 void __init detect_bootloader(void)
  73 {
  74         if (detect_cfe()) {
  75                 boot_loader_type = BOOT_LOADER_CFE;
  76                 printk("Boot loader is : %s\n", boot_loader_names[boot_loader_type]);
  77         }
  78
  79         if (detect_redboot()) {
  80                 boot_loader_type = BOOT_LOADER_REDBOOT;
  81         }
  82         else
  83                 boot_loader_type = BOOT_LOADER_UNKNOWN;
  84 }
  85
  86 EXPORT_SYMBOL(boot_loader_type);