rt-thread/components/drivers/fdt/libfdt/fdt.h

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-12-20     RT-Thread   the first version
 */

#ifndef _FDT_H
#define _FDT_H
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 * Copyright 2012 Kim Phillips, Freescale Semiconductor.
 *
 * libfdt is dual licensed: you can use it either under the terms of
 * the GPL, or the BSD license, at your option.
 *
 *  a) This library 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.
 *
 *     This library is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public
 *     License along with this library; if not, write to the Free
 *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 *     MA 02110-1301 USA
 *
 * Alternatively,
 *
 *  b) Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *     1. Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *     2. Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __ASSEMBLY__

#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

struct fdt_header {
    fdt32_t magic;                  /* magic word FDT_MAGIC */
    fdt32_t totalsize;              /* total size of DT block */
    fdt32_t off_dt_struct;          /* offset to structure */
    fdt32_t off_dt_strings;         /* offset to strings */
    fdt32_t off_mem_rsvmap;         /* offset to memory reserve map */
    fdt32_t version;                /* format version */
    fdt32_t last_comp_version;      /* last compatible version */

    /* version 2 fields below */
    fdt32_t boot_cpuid_phys;        /* Which physical CPU id we're
                                    booting on */
    /* version 3 fields below */
    fdt32_t size_dt_strings;        /* size of the strings block */

    /* version 17 fields below */
    fdt32_t size_dt_struct;         /* size of the structure block */
};

struct fdt_reserve_entry {
    fdt64_t address;
    fdt64_t size;
};

struct fdt_node_header {
    fdt32_t tag;
    char name[0];
};

struct fdt_property {
    fdt32_t tag;
    fdt32_t len;
    fdt32_t nameoff;
    char data[0];
};

#endif /* !__ASSEMBLY */

#define FDT_MAGIC    0xd00dfeed    /* 4: version, 4: total size */
#define FDT_TAGSIZE    sizeof(fdt32_t)

#define FDT_BEGIN_NODE    0x1        /* Start node: full name */
#define FDT_END_NODE    0x2        /* End node */
#define FDT_PROP    0x3        /* Property: name off,
                       size, content */
#define FDT_NOP        0x4        /* nop */
#define FDT_END        0x9

#define FDT_V1_SIZE    (7*sizeof(fdt32_t))
#define FDT_V2_SIZE    (FDT_V1_SIZE + sizeof(fdt32_t))
#define FDT_V3_SIZE    (FDT_V2_SIZE + sizeof(fdt32_t))
#define FDT_V16_SIZE    FDT_V3_SIZE
#define FDT_V17_SIZE    (FDT_V16_SIZE + sizeof(fdt32_t))

#endif /* _FDT_H */