LXR linux/arch/openrisc/kernel/prom.c

   1/*
   2 * OpenRISC prom.c
   3 *
   4 * Linux architectural port borrowing liberally from similar works of
   5 * others.  All original copyrights apply as per the original source
   6 * declaration.
   7 *
   8 * Modifications for the OpenRISC architecture:
   9 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  10 *
  11 *      This program is free software; you can redistribute it and/or
  12 *      modify it under the terms of the GNU General Public License
  13 *      as published by the Free Software Foundation; either version
  14 *      2 of the License, or (at your option) any later version.
  15 *
  16 * Architecture specific procedures for creating, accessing and
  17 * interpreting the device tree.
  18 *
  19 */
  20
  21#include <stdarg.h>
  22#include <linux/kernel.h>
  23#include <linux/string.h>
  24#include <linux/init.h>
  25#include <linux/threads.h>
  26#include <linux/spinlock.h>
  27#include <linux/types.h>
  28#include <linux/pci.h>
  29#include <linux/stringify.h>
  30#include <linux/delay.h>
  31#include <linux/initrd.h>
  32#include <linux/bitops.h>
  33#include <linux/module.h>
  34#include <linux/kexec.h>
  35#include <linux/debugfs.h>
  36#include <linux/irq.h>
  37#include <linux/memblock.h>
  38#include <linux/of_fdt.h>
  39
  40#include <asm/prom.h>
  41#include <asm/page.h>
  42#include <asm/processor.h>
  43#include <asm/irq.h>
  44#include <linux/io.h>
  45#include <asm/mmu.h>
  46#include <asm/pgtable.h>
  47#include <asm/sections.h>
  48#include <asm/setup.h>
  49
  50extern char cmd_line[COMMAND_LINE_SIZE];
  51
  52void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  53{
  54        size &= PAGE_MASK;
  55        memblock_add(base, size);
  56}
  57
  58void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  59{
  60        return __va(memblock_alloc(size, align));
  61}
  62
  63void __init early_init_devtree(void *params)
  64{
  65        void *alloc;
  66
  67        /* Setup flat device-tree pointer */
  68        initial_boot_params = params;
  69
  70
  71        /* Retrieve various informations from the /chosen node of the
  72         * device-tree, including the platform type, initrd location and
  73         * size, TCE reserve, and more ...
  74         */
  75        of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
  76
  77        /* Scan memory nodes and rebuild MEMBLOCKs */
  78        of_scan_flat_dt(early_init_dt_scan_root, NULL);
  79        of_scan_flat_dt(early_init_dt_scan_memory, NULL);
  80
  81        /* Save command line for /proc/cmdline and then parse parameters */
  82        strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
  83
  84        memblock_allow_resize();
  85
  86        /* We must copy the flattend device tree from init memory to regular
  87         * memory because the device tree references the strings in it
  88         * directly.
  89         */
  90
  91        alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE));
  92
  93        memcpy(alloc, initial_boot_params, initial_boot_params->totalsize);
  94
  95        initial_boot_params = alloc;
  96}
  97
  98#ifdef CONFIG_BLK_DEV_INITRD
  99void __init early_init_dt_setup_initrd_arch(unsigned long start,
 100                unsigned long end)
 101{
 102        initrd_start = (unsigned long)__va(start);
 103        initrd_end = (unsigned long)__va(end);
 104        initrd_below_start_ok = 1;
 105}
 106#endif
 107