LXR linux/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
  35BSS_STACK(4096);
  36
  37static u32 ibm4xx_memstart;
  38
  39static void iss_4xx_fixups(void)
  40{
  41        void *memory;
  42        u32 reg[3];
  43
  44        memory = finddevice("/memory");
  45        if (!memory)
  46                fatal("Can't find memory node\n");
  47        /* This assumes #address-cells = 2, #size-cells =1 and that */
  48        getprop(memory, "reg", reg, sizeof(reg));
  49        if (reg[2])
  50                /* If the device tree specifies the memory range, use it */
  51                ibm4xx_memstart = reg[1];
  52        else
  53                /* othersize, read it from the SDRAM controller */
  54                ibm4xx_sdram_fixup_memsize();
  55}
  56
  57static void *iss_4xx_vmlinux_alloc(unsigned long size)
  58{
  59        return (void *)ibm4xx_memstart;
  60}
  61
  62#define SPRN_PIR        0x11E   /* Processor Identification Register */
  63void platform_init(void)
  64{
  65        unsigned long end_of_ram = 0x08000000;
  66        unsigned long avail_ram = end_of_ram - (unsigned long)_end;
  67        u32 pir_reg;
  68
  69        simple_alloc_init(_end, avail_ram, 128, 64);
  70        platform_ops.fixups = iss_4xx_fixups;
  71        platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
  72        platform_ops.exit = ibm44x_dbcr_reset;
  73        pir_reg = mfspr(SPRN_PIR);
  74        fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  75        fdt_init(_dtb_start);
  76        serial_console_init();
  77}
  78