prom.c

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/*
 * MIPS support for CONFIG_OF device tree support
 *
 * Copyright (C) 2010 Cisco Systems Inc. <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/debugfs.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>

#include <asm/page.h>
#include <asm/prom.h>

int __init early_init_dt_scan_memory_arch(unsigned long node,
                      const char *uname, int depth,
                      void *data)
{
    return early_init_dt_scan_memory(node, uname, depth, data);
}

void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
    return add_memory_region(base, size, BOOT_MEM_RAM);
}

void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
{
    return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
}

#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

void __init early_init_devtree(void *params)
{
    /* 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, and more ...
     */
    of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);


    /* Scan memory nodes */
    of_scan_flat_dt(early_init_dt_scan_root, NULL);
    of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
}

void __init __dt_setup_arch(struct boot_param_header *bph)
{
    if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
        pr_err("DTB has bad magic, ignoring builtin OF DTB\n");

        return;
    }

    initial_boot_params = bph;

    early_init_devtree(initial_boot_params);
}