/*

 * Functions to help device tree manipulation using libfdt.

 * It also provides functions to read entries from device tree proc

 * interface.

 *

 * Copyright 2008 IBM Corporation.

 * Authors: Jerone Young <jyoung5@us.ibm.com>

 *          Hollis Blanchard <hollisb@us.ibm.com>

 *

 * This work is licensed under the GNU GPL license version 2 or later.

 *

 */

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include "config.h"

#include "qemu-common.h"

#include "sysemu.h"

#include "device_tree.h"

#include <libfdt.h>

void *load_device_tree(const char *filename_path, void *load_addr)

{

    int dt_file_size;

    int dt_file_load_size;

    int new_dt_size;

    int ret;

    void *dt_file = NULL;

    void *fdt;

    dt_file_size = get_image_size(filename_path);

    if (dt_file_size < 0) {

        printf("Unable to get size of device tree file '%s'\n",

            filename_path);

        goto fail;

    }

    /* First allocate space in qemu for device tree */

    dt_file = qemu_mallocz(dt_file_size);

    if (dt_file == NULL) {

        printf("Unable to allocate memory in qemu for device tree\n");

        goto fail;

    }

    dt_file_load_size = load_image(filename_path, dt_file);

    /* Second we place new copy of 2x size in guest memory

     * This give us enough room for manipulation.

     */

    new_dt_size = dt_file_size * 2;

    fdt = load_addr;

    ret = fdt_open_into(dt_file, fdt, new_dt_size);

    if (ret) {

        printf("Unable to copy device tree in memory\n");

        goto fail;

    }

    /* Check sanity of device tree */

    if (fdt_check_header(fdt)) {

        printf ("Device tree file loaded into memory is invalid: %s\n",

            filename_path);

        goto fail;

    }

    /* free qemu memory with old device tree */

    qemu_free(dt_file);

    return fdt;

fail:

    qemu_free(dt_file);

    return NULL;

}

int qemu_devtree_setprop(void *fdt, const char *node_path,

                         const char *property, uint32_t *val_array, int size)

{

    int offset;

    offset = fdt_path_offset(fdt, node_path);

    if (offset < 0)

        return offset;

    return fdt_setprop(fdt, offset, property, val_array, size);

}

int qemu_devtree_setprop_cell(void *fdt, const char *node_path,

                              const char *property, uint32_t val)

{

    int offset;

    offset = fdt_path_offset(fdt, node_path);

    if (offset < 0)

        return offset;

    return fdt_setprop_cell(fdt, offset, property, val);

}

int qemu_devtree_setprop_string(void *fdt, const char *node_path,

                                const char *property, const char *string)

{

    int offset;

    offset = fdt_path_offset(fdt, node_path);

    if (offset < 0)

        return offset;

    return fdt_setprop_string(fdt, offset, property, string);

}