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

   1/*
   2 * Copyright © 2011 Tony Breeds 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 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
  15 *    Copyright © 2011 David Kleikamp IBM Corporation
  16 *
  17 * This program is free software; you can redistribute it and/or
  18 * modify it under the terms of the GNU General Public License
  19 * as published by the Free Software Foundation; either version
  20 * 2 of the License, or (at your option) any later version.
  21 */
  22#include <stdarg.h>
  23#include <stddef.h>
  24#include "types.h"
  25#include "elf.h"
  26#include "string.h"
  27#include "stdio.h"
  28#include "page.h"
  29#include "ops.h"
  30#include "reg.h"
  31#include "io.h"
  32#include "dcr.h"
  33#include "4xx.h"
  34#include "44x.h"
  35#include "libfdt.h"
  36
  37BSS_STACK(4096);
  38
  39#define MAX_RANKS       0x4
  40#define DDR3_MR0CF      0x80010011U
  41
  42static unsigned long long ibm_currituck_memsize;
  43static unsigned long long ibm_currituck_detect_memsize(void)
  44{
  45        u32 reg;
  46        unsigned i;
  47        unsigned long long memsize = 0;
  48
  49        for(i = 0; i < MAX_RANKS; i++){
  50                reg = mfdcrx(DDR3_MR0CF + i);
  51
  52                if (!(reg & 1))
  53                        continue;
  54
  55                reg &= 0x0000f000;
  56                reg >>= 12;
  57                memsize += (0x800000ULL << reg);
  58        }
  59
  60        return memsize;
  61}
  62
  63static void ibm_currituck_fixups(void)
  64{
  65        void *devp = finddevice("/");
  66        u32 dma_ranges[7];
  67
  68        dt_fixup_memory(0x0ULL,  ibm_currituck_memsize);
  69
  70        while ((devp = find_node_by_devtype(devp, "pci"))) {
  71                if (getprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges)) < 0) {
  72                        printf("%s: Failed to get dma-ranges\r\n", __func__);
  73                        continue;
  74                }
  75
  76                dma_ranges[5] = ibm_currituck_memsize >> 32;
  77                dma_ranges[6] = ibm_currituck_memsize & 0xffffffffUL;
  78
  79                setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
  80        }
  81}
  82
  83#define SPRN_PIR        0x11E   /* Processor Identification Register */
  84void platform_init(void)
  85{
  86        unsigned long end_of_ram, avail_ram;
  87        u32 pir_reg;
  88        int node, size;
  89        const u32 *timebase;
  90
  91        ibm_currituck_memsize = ibm_currituck_detect_memsize();
  92        if (ibm_currituck_memsize >> 32)
  93                end_of_ram = ~0UL;
  94        else
  95                end_of_ram = ibm_currituck_memsize;
  96        avail_ram = end_of_ram - (unsigned long)_end;
  97
  98        simple_alloc_init(_end, avail_ram, 128, 64);
  99        platform_ops.fixups = ibm_currituck_fixups;
 100        platform_ops.exit = ibm44x_dbcr_reset;
 101        pir_reg = mfspr(SPRN_PIR);
 102
 103        /* Make sure FDT blob is sane */
 104        if (fdt_check_header(_dtb_start) != 0)
 105                fatal("Invalid device tree blob\n");
 106
 107        node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
 108                                             "cpu", sizeof("cpu"));
 109        if (!node)
 110                fatal("Cannot find cpu node\n");
 111        timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
 112        if (timebase && (size == 4))
 113                timebase_period_ns = 1000000000 / *timebase;
 114
 115        fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
 116        fdt_init(_dtb_start);
 117
 118        serial_console_init();
 119}
 120