release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/boot/treeboot-iss4xx.c

   1 /*
   2  * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
   3  *
   4  * Based on earlier code:
   5  *   Copyright (C) Paul Mackerras 1997.
   6  *
   7  *   Matt Porter <mporter@kernel.crashing.org>
   8  *   Copyright 2002-2005 MontaVista Software Inc.
   9  *
  10  *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  11  *   Copyright (c) 2003, 2004 Zultys Technologies
  12  *
  13  *    Copyright 2007 David Gibson, IBM Corporation.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version
  18  * 2 of the License, or (at your option) any later version.
  19  */
  20 #include <stdarg.h>
  21 #include <stddef.h>
  22 #include "types.h"
  23 #include "elf.h"
  24 #include "string.h"
  25 #include "stdio.h"
  26 #include "page.h"
  27 #include "ops.h"
  28 #include "reg.h"
  29 #include "io.h"
  30 #include "dcr.h"
  31 #include "4xx.h"
  32 #include "44x.h"
  33 #include "libfdt.h"
  34
  35 BSS_STACK(4096);
  36
  37 static void iss_4xx_fixups(void)
  38 {
  39         ibm4xx_sdram_fixup_memsize();
  40 }
  41
  42 #define SPRN_PIR        0x11E   /* Processor Indentification Register */
  43 void platform_init(void)
  44 {
  45         unsigned long end_of_ram = 0x08000000;
  46         unsigned long avail_ram = end_of_ram - (unsigned long)_end;
  47         u32 pir_reg;
  48
  49         simple_alloc_init(_end, avail_ram, 128, 64);
  50         platform_ops.fixups = iss_4xx_fixups;
  51         platform_ops.exit = ibm44x_dbcr_reset;
  52         pir_reg = mfspr(SPRN_PIR);
  53         fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  54         fdt_init(_dtb_start);
  55         serial_console_init();
  56 }