prom.c

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/*
 * OpenRISC prom.c
 *
 * Linux architectural port borrowing liberally from similar works of
 * others.  All original copyrights apply as per the original source
 * declaration.
 *
 * Modifications for the OpenRISC architecture:
 * Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 * Architecture specific procedures for creating, accessing and
 * interpreting the device tree.
 *
 */

#include <stdarg.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kexec.h>
#include <linux/debugfs.h>
#include <linux/irq.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>

#include <asm/prom.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <linux/io.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/setup.h>

extern char cmd_line[COMMAND_LINE_SIZE];

void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
    size &= PAGE_MASK;
    memblock_add(base, size);
}

void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
{
    return __va(memblock_alloc(size, align));
}

void __init early_init_devtree(void *params)
{
    void *alloc;

    /* Setup flat device-tree pointer */
    initial_boot_params = params;


    /* Retrieve various informations from the /chosen node of the
     * device-tree, including the platform type, initrd location and
     * size, TCE reserve, and more ...
     */
    of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);

    /* Scan memory nodes and rebuild MEMBLOCKs */
    of_scan_flat_dt(early_init_dt_scan_root, NULL);
    of_scan_flat_dt(early_init_dt_scan_memory, NULL);

    /* Save command line for /proc/cmdline and then parse parameters */
    strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);

    memblock_allow_resize();

    /* We must copy the flattend device tree from init memory to regular
     * memory because the device tree references the strings in it
     * directly.
     */

    alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE));

    memcpy(alloc, initial_boot_params, initial_boot_params->totalsize);

    initial_boot_params = alloc;
}

#ifdef CONFIG_BLK_DEV_INITRD
void __init early_init_dt_setup_initrd_arch(unsigned long start,
        unsigned long end)
{
    initrd_start = (unsigned long)__va(start);
    initrd_end = (unsigned long)__va(end);
    initrd_below_start_ok = 1;
}
#endif