LXR linux/arch/powerpc/boot/treeboot-iss4xx.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
   4 *
   5 * Based on earlier code:
   6 *   Copyright (C) Paul Mackerras 1997.
   7 *
   8 *   Matt Porter <mporter@kernel.crashing.org>
   9 *   Copyright 2002-2005 MontaVista Software Inc.
  10 *
  11 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  12 *   Copyright (c) 2003, 2004 Zultys Technologies
  13 *
  14 *    Copyright 2007 David Gibson, IBM Corporation.
  15 */
  16#include <stdarg.h>
  17#include <stddef.h>
  18#include "types.h"
  19#include "elf.h"
  20#include "string.h"
  21#include "stdio.h"
  22#include "page.h"
  23#include "ops.h"
  24#include "reg.h"
  25#include "io.h"
  26#include "dcr.h"
  27#include "4xx.h"
  28#include "44x.h"
  29#include "libfdt.h"
  30
  31BSS_STACK(4096);
  32
  33static u32 ibm4xx_memstart;
  34
  35static void iss_4xx_fixups(void)
  36{
  37        void *memory;
  38        u32 reg[3];
  39
  40        memory = finddevice("/memory");
  41        if (!memory)
  42                fatal("Can't find memory node\n");
  43        /* This assumes #address-cells = 2, #size-cells =1 and that */
  44        getprop(memory, "reg", reg, sizeof(reg));
  45        if (reg[2])
  46                /* If the device tree specifies the memory range, use it */
  47                ibm4xx_memstart = reg[1];
  48        else
  49                /* othersize, read it from the SDRAM controller */
  50                ibm4xx_sdram_fixup_memsize();
  51}
  52
  53static void *iss_4xx_vmlinux_alloc(unsigned long size)
  54{
  55        return (void *)ibm4xx_memstart;
  56}
  57
  58#define SPRN_PIR        0x11E   /* Processor Identification Register */
  59void platform_init(void)
  60{
  61        unsigned long end_of_ram = 0x08000000;
  62        unsigned long avail_ram = end_of_ram - (unsigned long)_end;
  63        u32 pir_reg;
  64
  65        simple_alloc_init(_end, avail_ram, 128, 64);
  66        platform_ops.fixups = iss_4xx_fixups;
  67        platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
  68        platform_ops.exit = ibm44x_dbcr_reset;
  69        pir_reg = mfspr(SPRN_PIR);
  70        fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  71        fdt_init(_dtb_start);
  72        serial_console_init();
  73}
  74