#ifndef _LIBFDT_H

#define _LIBFDT_H

/*

 * libfdt - Flat Device Tree manipulation

 * Copyright (C) 2006 David Gibson, IBM Corporation.

 *

 * 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.

 */

#include <libfdt_env.h>

#include <fdt.h>

#define FDT_FIRST_SUPPORTED_VERSION	0x10

#define FDT_LAST_SUPPORTED_VERSION	0x11

/* Error codes: informative error codes */

#define FDT_ERR_NOTFOUND	1

	/* FDT_ERR_NOTFOUND: The requested node or property does not exist */

#define FDT_ERR_EXISTS		2

	/* FDT_ERR_EXISTS: Attemped to create a node or property which

	 * already exists */

#define FDT_ERR_NOSPACE		3

	/* FDT_ERR_NOSPACE: Operation needed to expand the device

	 * tree, but its buffer did not have sufficient space to

	 * contain the expanded tree. Use fdt_open_into() to move the

	 * device tree to a buffer with more space. */

/* Error codes: codes for bad parameters */

#define FDT_ERR_BADOFFSET	4

	/* FDT_ERR_BADOFFSET: Function was passed a structure block

	 * offset which is out-of-bounds, or which points to an

	 * unsuitable part of the structure for the operation. */

#define FDT_ERR_BADPATH		5

	/* FDT_ERR_BADPATH: Function was passed a badly formatted path

	 * (e.g. missing a leading / for a function which requires an

	 * absolute path) */

#define FDT_ERR_BADPHANDLE	6

	/* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle

	 * value.  phandle values of 0 and -1 are not permitted. */

#define FDT_ERR_BADSTATE	7

	/* FDT_ERR_BADSTATE: Function was passed an incomplete device

	 * tree created by the sequential-write functions, which is

	 * not sufficiently complete for the requested operation. */

/* Error codes: codes for bad device tree blobs */

#define FDT_ERR_TRUNCATED	8

	/* FDT_ERR_TRUNCATED: Structure block of the given device tree

	 * ends without an FDT_END tag. */

#define FDT_ERR_BADMAGIC	9

	/* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a

	 * device tree at all - it is missing the flattened device

	 * tree magic number. */

#define FDT_ERR_BADVERSION	10

	/* FDT_ERR_BADVERSION: Given device tree has a version which

	 * can't be handled by the requested operation.  For

	 * read-write functions, this may mean that fdt_open_into() is

	 * required to convert the tree to the expected version. */

#define FDT_ERR_BADSTRUCTURE	11

	/* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt

	 * structure block or other serious error (e.g. misnested

	 * nodes, or subnodes preceding properties). */

#define FDT_ERR_BADLAYOUT	12

	/* FDT_ERR_BADLAYOUT: For read-write functions, the given

	 * device tree has it's sub-blocks in an order that the

	 * function can't handle (memory reserve map, then structure,

	 * then strings).  Use fdt_open_into() to reorganize the tree

	 * into a form suitable for the read-write operations. */

/* "Can't happen" error indicating a bug in libfdt */

#define FDT_ERR_INTERNAL	13

	/* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.

	 * Should never be returned, if it is, it indicates a bug in

	 * libfdt itself. */

#define FDT_ERR_MAX		13

/**********************************************************************/

/* Low-level functions (you probably don't need these)                */

/**********************************************************************/

const void *fdt_offset_ptr(const void *fdt, int offset, int checklen);

static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)

{

	return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);

}

uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);

/**********************************************************************/

/* Traversal functions                                                */

/**********************************************************************/

int fdt_next_node(const void *fdt, int offset, int *depth);

/**********************************************************************/

/* General functions                                                  */

/**********************************************************************/

#define fdt_get_header(fdt, field) \

	(fdt32_to_cpu(((const struct fdt_header *)(fdt))->field))

#define fdt_magic(fdt) 			(fdt_get_header(fdt, magic))

#define fdt_totalsize(fdt)		(fdt_get_header(fdt, totalsize))

#define fdt_off_dt_struct(fdt)		(fdt_get_header(fdt, off_dt_struct))

#define fdt_off_dt_strings(fdt)		(fdt_get_header(fdt, off_dt_strings))

#define fdt_off_mem_rsvmap(fdt)		(fdt_get_header(fdt, off_mem_rsvmap))

#define fdt_version(fdt)		(fdt_get_header(fdt, version))

#define fdt_last_comp_version(fdt) 	(fdt_get_header(fdt, last_comp_version))

#define fdt_boot_cpuid_phys(fdt) 	(fdt_get_header(fdt, boot_cpuid_phys))

#define fdt_size_dt_strings(fdt) 	(fdt_get_header(fdt, size_dt_strings))

#define fdt_size_dt_struct(fdt)		(fdt_get_header(fdt, size_dt_struct))

#define __fdt_set_hdr(name) \

	static inline void fdt_set_##name(void *fdt, uint32_t val) \

	{ \

		struct fdt_header *fdth = fdt; \

		fdth->name = cpu_to_fdt32(val); \

	}

__fdt_set_hdr(magic);

__fdt_set_hdr(totalsize);

__fdt_set_hdr(off_dt_struct);

__fdt_set_hdr(off_dt_strings);

__fdt_set_hdr(off_mem_rsvmap);

__fdt_set_hdr(version);

__fdt_set_hdr(last_comp_version);

__fdt_set_hdr(boot_cpuid_phys);

__fdt_set_hdr(size_dt_strings);

__fdt_set_hdr(size_dt_struct);

#undef __fdt_set_hdr

/**

 * fdt_check_header - sanity check a device tree or possible device tree

 * @fdt: pointer to data which might be a flattened device tree

 *

 * fdt_check_header() checks that the given buffer contains what

 * appears to be a flattened device tree with sane information in its

 * header.

 *

 * returns:

 *     0, if the buffer appears to contain a valid device tree

 *     -FDT_ERR_BADMAGIC,

 *     -FDT_ERR_BADVERSION,

 *     -FDT_ERR_BADSTATE, standard meanings, as above

 */

int fdt_check_header(const void *fdt);

/**

 * fdt_move - move a device tree around in memory

 * @fdt: pointer to the device tree to move

 * @buf: pointer to memory where the device is to be moved

 * @bufsize: size of the memory space at buf

 *

 * fdt_move() relocates, if possible, the device tree blob located at

 * fdt to the buffer at buf of size bufsize.  The buffer may overlap

 * with the existing device tree blob at fdt.  Therefore,

 *     fdt_move(fdt, fdt, fdt_totalsize(fdt))

 * should always succeed.

 *

 * returns:

 *     0, on success

 *     -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree

 *     -FDT_ERR_BADMAGIC,

 *     -FDT_ERR_BADVERSION,

 *     -FDT_ERR_BADSTATE, standard meanings

 */

int fdt_move(const void *fdt, void *buf, int bufsize);

/**********************************************************************/

/* Read-only functions                                                */

/**********************************************************************/

/**

 * fdt_string - retrieve a string from the strings block of a device tree

 * @fdt: pointer to the device tree blob

 * @stroffset: offset of the string within the strings block (native endian)

 *

 * fdt_string() retrieves a pointer to a single string from the

 * strings block of the device tree blob at fdt.

 *

 * returns:

 *     a pointer to the string, on success

 *     NULL, if stroffset is out of bounds

 */

const char *fdt_string(const void *fdt, int stroffset);

/**

 * fdt_num_mem_rsv - retrieve the number of memory reserve map entries

 * @fdt: pointer to the device tree blob

 *

 * Returns the number of entries in the device tree blob's memory

 * reservation map.  This does not include the terminating 0,0 entry

 * or any other (0,0) entries reserved for expansion.

 *

 * returns:

 *     the number of entries

 */

int fdt_num_mem_rsv(const void *fdt);

/**

 * fdt_get_mem_rsv - retrieve one memory reserve map entry

 * @fdt: pointer to the device tree blob

 * @address, @size: pointers to 64-bit variables

 *

 * On success, *address and *size will contain the address and size of

 * the n-th reserve map entry from the device tree blob, in

 * native-endian format.

 *

 * returns:

 *     0, on success

 *     -FDT_ERR_BADMAGIC,

 *     -FDT_ERR_BADVERSION,

 *     -FDT_ERR_BADSTATE, standard meanings

 */

int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);

/**

 * fdt_subnode_offset_namelen - find a subnode based on substring

 * @fdt: pointer to the device tree blob

 * @parentoffset: structure block offset of a node

 * @name: name of the subnode to locate

 * @namelen: number of characters of name to consider

 *

 * Identical to fdt_subnode_offset(), but only examine the first

 * namelen characters of name for matching the subnode name.  This is

 * useful for finding subnodes based on a portion of a larger string,

 * such as a full path.

 */

int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,

			       const char *name, int namelen);

/**

 * fdt_subnode_offset - find a subnode of a given node

 * @fdt: pointer to the device tree blob

 * @parentoffset: structure block offset of a node

 * @name: name of the subnode to locate

 *

 * fdt_subnode_offset() finds a subnode of the node at structure block

 * offset parentoffset with the given name.  name may include a unit

 * address, in which case fdt_subnode_offset() will find the subnode

 * with that unit address, or the unit address may be omitted, in

 * which case fdt_subnode_offset() will find an arbitrary subnode

 * whose name excluding unit address matches the given name.

 *

 * returns:

 *	structure block offset of the requested subnode (>=0), on success

 *	-FDT_ERR_NOTFOUND, if the requested subnode does not exist

 *	-FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag

 *      -FDT_ERR_BADMAGIC,

 *	-FDT_ERR_BADVERSION,

 *	-FDT_ERR_BADSTATE,

 *	-FDT_ERR_BADSTRUCTURE,

 *	-FDT_ERR_TRUNCATED, standard meanings.

 */

int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);

/**

 * fdt_path_offset - find a tree node by its full path

 * @fdt: pointer to the device tree blob

 * @path: full path of the node to locate

 *

 * fdt_path_offset() finds a node of a given path in the device tree.

 * Each path component may omit the unit address portion, but the

 * results of this are undefined if any such path component is

 * ambiguous (that is if there are multiple nodes at the relevant

 * level matching the given component, differentiated only by unit

 * address).

 *

 * returns:

 *	structure block offset of the node with the requested path (>=0), on success

 *	-FDT_ERR_BADPATH, given path does not begin with '/' or is invalid

 *	-FDT_ERR_NOTFOUND, if the requested node does not exist

 *      -FDT_ERR_BADMAGIC,

 *	-FDT_ERR_BADVERSION,

 *	-FDT_ERR_BADSTATE,

 *	-FDT_ERR_BADSTRUCTURE,

 *	-FDT_ERR_TRUNCATED, standard meanings.

 */

int fdt_path_offset(const void *fdt, const char *path);

/**

 * fdt_get_name - retrieve the name of a given node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: structure block offset of the starting node

 * @lenp: pointer to an integer variable (will be overwritten) or NULL

 *

 * fdt_get_name() retrieves the name (including unit address) of the

 * device tree node at structure block offset nodeoffset.  If lenp is

 * non-NULL, the length of this name is also returned, in the integer

 * pointed to by lenp.

 *

 * returns:

 *	pointer to the node's name, on success

 *		If lenp is non-NULL, *lenp contains the length of that name (>=0)

 *	NULL, on error

 *		if lenp is non-NULL *lenp contains an error code (<0):

 *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag

 *		-FDT_ERR_BADMAGIC,

 *		-FDT_ERR_BADVERSION,

 *		-FDT_ERR_BADSTATE, standard meanings

 */

const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);

/**

 * fdt_get_property - find a given property in a given node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: offset of the node whose property to find

 * @name: name of the property to find

 * @lenp: pointer to an integer variable (will be overwritten) or NULL

 *

 * fdt_get_property() retrieves a pointer to the fdt_property

 * structure within the device tree blob corresponding to the property

 * named 'name' of the node at offset nodeoffset.  If lenp is

 * non-NULL, the length of the property value is also returned, in the

 * integer pointed to by lenp.

 *

 * returns:

 *	pointer to the structure representing the property

 *		if lenp is non-NULL, *lenp contains the length of the property

 *		value (>=0)

 *	NULL, on error

 *		if lenp is non-NULL, *lenp contains an error code (<0):

 *		-FDT_ERR_NOTFOUND, node does not have named property

 *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag

 *		-FDT_ERR_BADMAGIC,

 *		-FDT_ERR_BADVERSION,

 *		-FDT_ERR_BADSTATE,

 *		-FDT_ERR_BADSTRUCTURE,

 *		-FDT_ERR_TRUNCATED, standard meanings

 */

const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,

					    const char *name, int *lenp);

static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,

						      const char *name,

						      int *lenp)

{

	return (struct fdt_property *)(uintptr_t)

		fdt_get_property(fdt, nodeoffset, name, lenp);

}

/**

 * fdt_getprop - retrieve the value of a given property

 * @fdt: pointer to the device tree blob

 * @nodeoffset: offset of the node whose property to find

 * @name: name of the property to find

 * @lenp: pointer to an integer variable (will be overwritten) or NULL

 *

 * fdt_getprop() retrieves a pointer to the value of the property

 * named 'name' of the node at offset nodeoffset (this will be a

 * pointer to within the device blob itself, not a copy of the value).

 * If lenp is non-NULL, the length of the property value is also

 * returned, in the integer pointed to by lenp.

 *

 * returns:

 *	pointer to the property's value

 *		if lenp is non-NULL, *lenp contains the length of the property

 *		value (>=0)

 *	NULL, on error

 *		if lenp is non-NULL, *lenp contains an error code (<0):

 *		-FDT_ERR_NOTFOUND, node does not have named property

 *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag

 *		-FDT_ERR_BADMAGIC,

 *		-FDT_ERR_BADVERSION,

 *		-FDT_ERR_BADSTATE,

 *		-FDT_ERR_BADSTRUCTURE,

 *		-FDT_ERR_TRUNCATED, standard meanings

 */

const void *fdt_getprop(const void *fdt, int nodeoffset,

			const char *name, int *lenp);

static inline void *fdt_getprop_w(void *fdt, int nodeoffset,

				  const char *name, int *lenp)

{

	return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp);

}

/**

 * fdt_get_phandle - retrieve the phandle of a given node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: structure block offset of the node

 *

 * fdt_get_phandle() retrieves the phandle of the device tree node at

 * structure block offset nodeoffset.

 *

 * returns:

 *	the phandle of the node at nodeoffset, on success (!= 0, != -1)

 *	0, if the node has no phandle, or another error occurs

 */

uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);

/**

 * fdt_get_path - determine the full path of a node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: offset of the node whose path to find

 * @buf: character buffer to contain the returned path (will be overwritten)

 * @buflen: size of the character buffer at buf

 *

 * fdt_get_path() computes the full path of the node at offset

 * nodeoffset, and records that path in the buffer at buf.

 *

 * NOTE: This function is expensive, as it must scan the device tree

 * structure from the start to nodeoffset.

 *

 * returns:

 *	0, on success

 *		buf contains the absolute path of the node at

 *		nodeoffset, as a NUL-terminated string.

 * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag

 *	-FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1)

 *		characters and will not fit in the given buffer.

 *	-FDT_ERR_BADMAGIC,

 *	-FDT_ERR_BADVERSION,

 *	-FDT_ERR_BADSTATE,

 *	-FDT_ERR_BADSTRUCTURE, standard meanings

 */

int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);

/**

 * fdt_supernode_atdepth_offset - find a specific ancestor of a node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: offset of the node whose parent to find

 * @supernodedepth: depth of the ancestor to find

 * @nodedepth: pointer to an integer variable (will be overwritten) or NULL

 *

 * fdt_supernode_atdepth_offset() finds an ancestor of the given node

 * at a specific depth from the root (where the root itself has depth

 * 0, its immediate subnodes depth 1 and so forth).  So

 *	fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL);

 * will always return 0, the offset of the root node.  If the node at

 * nodeoffset has depth D, then:

 *	fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL);

 * will return nodeoffset itself.

 *

 * NOTE: This function is expensive, as it must scan the device tree

 * structure from the start to nodeoffset.

 *

 * returns:

 *	structure block offset of the node at node offset's ancestor

 *		of depth supernodedepth (>=0), on success

 * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag

*	-FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset

 *	-FDT_ERR_BADMAGIC,

 *	-FDT_ERR_BADVERSION,

 *	-FDT_ERR_BADSTATE,

 *	-FDT_ERR_BADSTRUCTURE, standard meanings

 */

int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,

				 int supernodedepth, int *nodedepth);

/**

 * fdt_node_depth - find the depth of a given node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: offset of the node whose parent to find

 *

 * fdt_node_depth() finds the depth of a given node.  The root node

 * has depth 0, its immediate subnodes depth 1 and so forth.

 *

 * NOTE: This function is expensive, as it must scan the device tree

 * structure from the start to nodeoffset.

 *

 * returns:

 *	depth of the node at nodeoffset (>=0), on success

 * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag

 *	-FDT_ERR_BADMAGIC,

 *	-FDT_ERR_BADVERSION,

 *	-FDT_ERR_BADSTATE,

 *	-FDT_ERR_BADSTRUCTURE, standard meanings

 */

int fdt_node_depth(const void *fdt, int nodeoffset);

/**

 * fdt_parent_offset - find the parent of a given node

 * @fdt: pointer to the device tree blob

 * @nodeoffset: offset of the node whose parent to find

 *

 * fdt_parent_offset() locates the parent node of a given node (that

 * is, it finds the offset of the node which contains the node at

 * nodeoffset as a subnode).

 *

 * NOTE: This function is expensive, as it must scan the device tree

 * structure from the start to nodeoffset, *twice*.

 *

 * returns:

 *	structure block offset of the parent of the node at nodeoffset

 *		(>=0), on success

 * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag

 *	-FDT_ERR_BADMAGIC,