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8d04f02f KG |
1 | #ifndef _LIBFDT_H |
2 | #define _LIBFDT_H | |
7cd5da0f GVB |
3 | /* |
4 | * libfdt - Flat Device Tree manipulation | |
5 | * Copyright (C) 2006 David Gibson, IBM Corporation. | |
6 | * | |
8d04f02f KG |
7 | * libfdt is dual licensed: you can use it either under the terms of |
8 | * the GPL, or the BSD license, at your option. | |
9 | * | |
10 | * a) This library is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License, or (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this library; if not, write to the Free | |
22 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
23 | * MA 02110-1301 USA | |
24 | * | |
25 | * Alternatively, | |
26 | * | |
27 | * b) Redistribution and use in source and binary forms, with or | |
28 | * without modification, are permitted provided that the following | |
29 | * conditions are met: | |
7cd5da0f | 30 | * |
8d04f02f KG |
31 | * 1. Redistributions of source code must retain the above |
32 | * copyright notice, this list of conditions and the following | |
33 | * disclaimer. | |
34 | * 2. Redistributions in binary form must reproduce the above | |
35 | * copyright notice, this list of conditions and the following | |
36 | * disclaimer in the documentation and/or other materials | |
37 | * provided with the distribution. | |
7cd5da0f | 38 | * |
8d04f02f KG |
39 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
40 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
41 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
42 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
43 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
44 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
49 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
50 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
51 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
7cd5da0f GVB |
52 | */ |
53 | ||
7cd5da0f | 54 | #include <libfdt_env.h> |
8d04f02f | 55 | #include <fdt.h> |
7cd5da0f GVB |
56 | |
57 | #define FDT_FIRST_SUPPORTED_VERSION 0x10 | |
58 | #define FDT_LAST_SUPPORTED_VERSION 0x11 | |
59 | ||
60 | /* Error codes: informative error codes */ | |
61 | #define FDT_ERR_NOTFOUND 1 | |
8d04f02f | 62 | /* FDT_ERR_NOTFOUND: The requested node or property does not exist */ |
7cd5da0f | 63 | #define FDT_ERR_EXISTS 2 |
8d04f02f KG |
64 | /* FDT_ERR_EXISTS: Attemped to create a node or property which |
65 | * already exists */ | |
7cd5da0f | 66 | #define FDT_ERR_NOSPACE 3 |
8d04f02f KG |
67 | /* FDT_ERR_NOSPACE: Operation needed to expand the device |
68 | * tree, but its buffer did not have sufficient space to | |
69 | * contain the expanded tree. Use fdt_open_into() to move the | |
70 | * device tree to a buffer with more space. */ | |
7cd5da0f GVB |
71 | |
72 | /* Error codes: codes for bad parameters */ | |
73 | #define FDT_ERR_BADOFFSET 4 | |
8d04f02f KG |
74 | /* FDT_ERR_BADOFFSET: Function was passed a structure block |
75 | * offset which is out-of-bounds, or which points to an | |
76 | * unsuitable part of the structure for the operation. */ | |
7cd5da0f | 77 | #define FDT_ERR_BADPATH 5 |
8d04f02f KG |
78 | /* FDT_ERR_BADPATH: Function was passed a badly formatted path |
79 | * (e.g. missing a leading / for a function which requires an | |
80 | * absolute path) */ | |
81 | #define FDT_ERR_BADPHANDLE 6 | |
82 | /* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle | |
83 | * value. phandle values of 0 and -1 are not permitted. */ | |
84 | #define FDT_ERR_BADSTATE 7 | |
85 | /* FDT_ERR_BADSTATE: Function was passed an incomplete device | |
86 | * tree created by the sequential-write functions, which is | |
87 | * not sufficiently complete for the requested operation. */ | |
7cd5da0f GVB |
88 | |
89 | /* Error codes: codes for bad device tree blobs */ | |
8d04f02f KG |
90 | #define FDT_ERR_TRUNCATED 8 |
91 | /* FDT_ERR_TRUNCATED: Structure block of the given device tree | |
92 | * ends without an FDT_END tag. */ | |
93 | #define FDT_ERR_BADMAGIC 9 | |
94 | /* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a | |
95 | * device tree at all - it is missing the flattened device | |
96 | * tree magic number. */ | |
97 | #define FDT_ERR_BADVERSION 10 | |
98 | /* FDT_ERR_BADVERSION: Given device tree has a version which | |
99 | * can't be handled by the requested operation. For | |
100 | * read-write functions, this may mean that fdt_open_into() is | |
101 | * required to convert the tree to the expected version. */ | |
102 | #define FDT_ERR_BADSTRUCTURE 11 | |
103 | /* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt | |
104 | * structure block or other serious error (e.g. misnested | |
105 | * nodes, or subnodes preceding properties). */ | |
106 | #define FDT_ERR_BADLAYOUT 12 | |
107 | /* FDT_ERR_BADLAYOUT: For read-write functions, the given | |
108 | * device tree has it's sub-blocks in an order that the | |
109 | * function can't handle (memory reserve map, then structure, | |
110 | * then strings). Use fdt_open_into() to reorganize the tree | |
111 | * into a form suitable for the read-write operations. */ | |
112 | ||
113 | /* "Can't happen" error indicating a bug in libfdt */ | |
114 | #define FDT_ERR_INTERNAL 13 | |
115 | /* FDT_ERR_INTERNAL: libfdt has failed an internal assertion. | |
116 | * Should never be returned, if it is, it indicates a bug in | |
117 | * libfdt itself. */ | |
7cd5da0f | 118 | |
0596d35d SG |
119 | /* Errors in device tree content */ |
120 | #define FDT_ERR_BADNCELLS 14 | |
121 | /* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells | |
122 | * or similar property with a bad format or value */ | |
123 | ||
c3c4c005 SG |
124 | #define FDT_ERR_TOODEEP 15 |
125 | /* FDT_ERR_TOODEEP: The depth of a node has exceeded the internal | |
126 | * libfdt limit. This can happen if you have more than | |
127 | * FDT_MAX_DEPTH nested nodes. */ | |
128 | ||
129 | #define FDT_ERR_MAX 15 | |
8d04f02f KG |
130 | |
131 | /**********************************************************************/ | |
132 | /* Low-level functions (you probably don't need these) */ | |
133 | /**********************************************************************/ | |
134 | ||
741a6d01 | 135 | const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen); |
8d04f02f KG |
136 | static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen) |
137 | { | |
c6683026 | 138 | return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen); |
8d04f02f KG |
139 | } |
140 | ||
141 | uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset); | |
142 | ||
ae0b5908 DG |
143 | /**********************************************************************/ |
144 | /* Traversal functions */ | |
145 | /**********************************************************************/ | |
146 | ||
147 | int fdt_next_node(const void *fdt, int offset, int *depth); | |
148 | ||
88f95bba SG |
149 | /** |
150 | * fdt_first_subnode() - get offset of first direct subnode | |
151 | * | |
152 | * @fdt: FDT blob | |
153 | * @offset: Offset of node to check | |
154 | * @return offset of first subnode, or -FDT_ERR_NOTFOUND if there is none | |
155 | */ | |
156 | int fdt_first_subnode(const void *fdt, int offset); | |
157 | ||
158 | /** | |
159 | * fdt_next_subnode() - get offset of next direct subnode | |
160 | * | |
161 | * After first calling fdt_first_subnode(), call this function repeatedly to | |
162 | * get direct subnodes of a parent node. | |
163 | * | |
164 | * @fdt: FDT blob | |
165 | * @offset: Offset of previous subnode | |
166 | * @return offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more | |
167 | * subnodes | |
168 | */ | |
169 | int fdt_next_subnode(const void *fdt, int offset); | |
170 | ||
2f376042 TR |
171 | /** |
172 | * fdt_for_each_subnode - iterate over all subnodes of a parent | |
173 | * | |
174 | * This is actually a wrapper around a for loop and would be used like so: | |
175 | * | |
176 | * fdt_for_each_subnode(fdt, node, parent) { | |
177 | * ... | |
178 | * use node | |
179 | * ... | |
180 | * } | |
181 | * | |
182 | * Note that this is implemented as a macro and node is used as iterator in | |
183 | * the loop. It should therefore be a locally allocated variable. The parent | |
184 | * variable on the other hand is never modified, so it can be constant or | |
185 | * even a literal. | |
186 | * | |
187 | * @fdt: FDT blob (const void *) | |
188 | * @node: child node (int) | |
189 | * @parent: parent node (int) | |
190 | */ | |
191 | #define fdt_for_each_subnode(fdt, node, parent) \ | |
192 | for (node = fdt_first_subnode(fdt, parent); \ | |
193 | node >= 0; \ | |
194 | node = fdt_next_subnode(fdt, node)) | |
195 | ||
8d04f02f KG |
196 | /**********************************************************************/ |
197 | /* General functions */ | |
198 | /**********************************************************************/ | |
7cd5da0f GVB |
199 | |
200 | #define fdt_get_header(fdt, field) \ | |
8d04f02f | 201 | (fdt32_to_cpu(((const struct fdt_header *)(fdt))->field)) |
53677ef1 | 202 | #define fdt_magic(fdt) (fdt_get_header(fdt, magic)) |
7cd5da0f GVB |
203 | #define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize)) |
204 | #define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct)) | |
205 | #define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings)) | |
206 | #define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap)) | |
207 | #define fdt_version(fdt) (fdt_get_header(fdt, version)) | |
53677ef1 WD |
208 | #define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version)) |
209 | #define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys)) | |
210 | #define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings)) | |
7cd5da0f GVB |
211 | #define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct)) |
212 | ||
8d04f02f KG |
213 | #define __fdt_set_hdr(name) \ |
214 | static inline void fdt_set_##name(void *fdt, uint32_t val) \ | |
215 | { \ | |
67b89c79 | 216 | struct fdt_header *fdth = (struct fdt_header*)fdt; \ |
8d04f02f KG |
217 | fdth->name = cpu_to_fdt32(val); \ |
218 | } | |
219 | __fdt_set_hdr(magic); | |
220 | __fdt_set_hdr(totalsize); | |
221 | __fdt_set_hdr(off_dt_struct); | |
222 | __fdt_set_hdr(off_dt_strings); | |
223 | __fdt_set_hdr(off_mem_rsvmap); | |
224 | __fdt_set_hdr(version); | |
225 | __fdt_set_hdr(last_comp_version); | |
226 | __fdt_set_hdr(boot_cpuid_phys); | |
227 | __fdt_set_hdr(size_dt_strings); | |
228 | __fdt_set_hdr(size_dt_struct); | |
229 | #undef __fdt_set_hdr | |
7cd5da0f | 230 | |
8d04f02f KG |
231 | /** |
232 | * fdt_check_header - sanity check a device tree or possible device tree | |
233 | * @fdt: pointer to data which might be a flattened device tree | |
234 | * | |
235 | * fdt_check_header() checks that the given buffer contains what | |
236 | * appears to be a flattened device tree with sane information in its | |
237 | * header. | |
238 | * | |
239 | * returns: | |
240 | * 0, if the buffer appears to contain a valid device tree | |
241 | * -FDT_ERR_BADMAGIC, | |
242 | * -FDT_ERR_BADVERSION, | |
243 | * -FDT_ERR_BADSTATE, standard meanings, as above | |
244 | */ | |
6679f929 GVB |
245 | int fdt_check_header(const void *fdt); |
246 | ||
8d04f02f KG |
247 | /** |
248 | * fdt_move - move a device tree around in memory | |
249 | * @fdt: pointer to the device tree to move | |
250 | * @buf: pointer to memory where the device is to be moved | |
251 | * @bufsize: size of the memory space at buf | |
252 | * | |
253 | * fdt_move() relocates, if possible, the device tree blob located at | |
254 | * fdt to the buffer at buf of size bufsize. The buffer may overlap | |
255 | * with the existing device tree blob at fdt. Therefore, | |
256 | * fdt_move(fdt, fdt, fdt_totalsize(fdt)) | |
257 | * should always succeed. | |
258 | * | |
259 | * returns: | |
260 | * 0, on success | |
261 | * -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree | |
262 | * -FDT_ERR_BADMAGIC, | |
263 | * -FDT_ERR_BADVERSION, | |
264 | * -FDT_ERR_BADSTATE, standard meanings | |
265 | */ | |
266 | int fdt_move(const void *fdt, void *buf, int bufsize); | |
7cd5da0f | 267 | |
8d04f02f KG |
268 | /**********************************************************************/ |
269 | /* Read-only functions */ | |
270 | /**********************************************************************/ | |
7cd5da0f | 271 | |
8d04f02f | 272 | /** |
46390da1 | 273 | * fdt_string - retrieve a string from the strings block of a device tree |
8d04f02f KG |
274 | * @fdt: pointer to the device tree blob |
275 | * @stroffset: offset of the string within the strings block (native endian) | |
276 | * | |
277 | * fdt_string() retrieves a pointer to a single string from the | |
278 | * strings block of the device tree blob at fdt. | |
279 | * | |
280 | * returns: | |
281 | * a pointer to the string, on success | |
282 | * NULL, if stroffset is out of bounds | |
283 | */ | |
284 | const char *fdt_string(const void *fdt, int stroffset); | |
7cd5da0f | 285 | |
57c7809a MR |
286 | /** |
287 | * fdt_get_max_phandle - retrieves the highest phandle in a tree | |
288 | * @fdt: pointer to the device tree blob | |
289 | * | |
290 | * fdt_get_max_phandle retrieves the highest phandle in the given | |
291 | * device tree | |
292 | * | |
293 | * returns: | |
294 | * the highest phandle on success | |
295 | * 0, if an error occurred | |
296 | */ | |
297 | uint32_t fdt_get_max_phandle(const void *fdt); | |
298 | ||
8d04f02f | 299 | /** |
46390da1 | 300 | * fdt_num_mem_rsv - retrieve the number of memory reserve map entries |
8d04f02f KG |
301 | * @fdt: pointer to the device tree blob |
302 | * | |
303 | * Returns the number of entries in the device tree blob's memory | |
304 | * reservation map. This does not include the terminating 0,0 entry | |
305 | * or any other (0,0) entries reserved for expansion. | |
306 | * | |
307 | * returns: | |
308 | * the number of entries | |
309 | */ | |
310 | int fdt_num_mem_rsv(const void *fdt); | |
7cd5da0f | 311 | |
8d04f02f | 312 | /** |
46390da1 | 313 | * fdt_get_mem_rsv - retrieve one memory reserve map entry |
8d04f02f KG |
314 | * @fdt: pointer to the device tree blob |
315 | * @address, @size: pointers to 64-bit variables | |
316 | * | |
317 | * On success, *address and *size will contain the address and size of | |
318 | * the n-th reserve map entry from the device tree blob, in | |
319 | * native-endian format. | |
320 | * | |
321 | * returns: | |
322 | * 0, on success | |
323 | * -FDT_ERR_BADMAGIC, | |
324 | * -FDT_ERR_BADVERSION, | |
325 | * -FDT_ERR_BADSTATE, standard meanings | |
326 | */ | |
327 | int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size); | |
328 | ||
329 | /** | |
330 | * fdt_subnode_offset_namelen - find a subnode based on substring | |
331 | * @fdt: pointer to the device tree blob | |
332 | * @parentoffset: structure block offset of a node | |
333 | * @name: name of the subnode to locate | |
334 | * @namelen: number of characters of name to consider | |
335 | * | |
336 | * Identical to fdt_subnode_offset(), but only examine the first | |
337 | * namelen characters of name for matching the subnode name. This is | |
338 | * useful for finding subnodes based on a portion of a larger string, | |
339 | * such as a full path. | |
340 | */ | |
7cd5da0f GVB |
341 | int fdt_subnode_offset_namelen(const void *fdt, int parentoffset, |
342 | const char *name, int namelen); | |
8d04f02f KG |
343 | /** |
344 | * fdt_subnode_offset - find a subnode of a given node | |
345 | * @fdt: pointer to the device tree blob | |
346 | * @parentoffset: structure block offset of a node | |
347 | * @name: name of the subnode to locate | |
348 | * | |
349 | * fdt_subnode_offset() finds a subnode of the node at structure block | |
350 | * offset parentoffset with the given name. name may include a unit | |
351 | * address, in which case fdt_subnode_offset() will find the subnode | |
352 | * with that unit address, or the unit address may be omitted, in | |
353 | * which case fdt_subnode_offset() will find an arbitrary subnode | |
354 | * whose name excluding unit address matches the given name. | |
355 | * | |
356 | * returns: | |
357 | * structure block offset of the requested subnode (>=0), on success | |
358 | * -FDT_ERR_NOTFOUND, if the requested subnode does not exist | |
359 | * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag | |
360 | * -FDT_ERR_BADMAGIC, | |
361 | * -FDT_ERR_BADVERSION, | |
362 | * -FDT_ERR_BADSTATE, | |
363 | * -FDT_ERR_BADSTRUCTURE, | |
364 | * -FDT_ERR_TRUNCATED, standard meanings. | |
365 | */ | |
7cd5da0f GVB |
366 | int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name); |
367 | ||
8e968571 MR |
368 | /** |
369 | * fdt_path_offset_namelen - find a tree node based on substring | |
370 | * @fdt: pointer to the device tree blob | |
371 | * @path: full path of the node to locate | |
372 | * @namelen: number of characters of name to consider | |
373 | * | |
374 | * Identical to fdt_path_offset(), but only examine the first | |
375 | * namelen characters of path for matching the node path. | |
376 | */ | |
377 | int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen); | |
378 | ||
8d04f02f KG |
379 | /** |
380 | * fdt_path_offset - find a tree node by its full path | |
381 | * @fdt: pointer to the device tree blob | |
382 | * @path: full path of the node to locate | |
383 | * | |
384 | * fdt_path_offset() finds a node of a given path in the device tree. | |
385 | * Each path component may omit the unit address portion, but the | |
386 | * results of this are undefined if any such path component is | |
387 | * ambiguous (that is if there are multiple nodes at the relevant | |
388 | * level matching the given component, differentiated only by unit | |
389 | * address). | |
390 | * | |
391 | * returns: | |
392 | * structure block offset of the node with the requested path (>=0), on success | |
393 | * -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid | |
394 | * -FDT_ERR_NOTFOUND, if the requested node does not exist | |
395 | * -FDT_ERR_BADMAGIC, | |
396 | * -FDT_ERR_BADVERSION, | |
397 | * -FDT_ERR_BADSTATE, | |
398 | * -FDT_ERR_BADSTRUCTURE, | |
399 | * -FDT_ERR_TRUNCATED, standard meanings. | |
400 | */ | |
8e968571 MR |
401 | static inline int fdt_path_offset(const void *fdt, const char *path) |
402 | { | |
403 | return fdt_path_offset_namelen(fdt, path, strlen(path)); | |
404 | } | |
8d04f02f KG |
405 | |
406 | /** | |
46390da1 | 407 | * fdt_get_name - retrieve the name of a given node |
8d04f02f KG |
408 | * @fdt: pointer to the device tree blob |
409 | * @nodeoffset: structure block offset of the starting node | |
410 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
411 | * | |
412 | * fdt_get_name() retrieves the name (including unit address) of the | |
413 | * device tree node at structure block offset nodeoffset. If lenp is | |
414 | * non-NULL, the length of this name is also returned, in the integer | |
415 | * pointed to by lenp. | |
416 | * | |
417 | * returns: | |
418 | * pointer to the node's name, on success | |
419 | * If lenp is non-NULL, *lenp contains the length of that name (>=0) | |
420 | * NULL, on error | |
421 | * if lenp is non-NULL *lenp contains an error code (<0): | |
422 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
423 | * -FDT_ERR_BADMAGIC, | |
424 | * -FDT_ERR_BADVERSION, | |
425 | * -FDT_ERR_BADSTATE, standard meanings | |
426 | */ | |
427 | const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp); | |
428 | ||
d1c63148 DG |
429 | /** |
430 | * fdt_first_property_offset - find the offset of a node's first property | |
431 | * @fdt: pointer to the device tree blob | |
432 | * @nodeoffset: structure block offset of a node | |
433 | * | |
434 | * fdt_first_property_offset() finds the first property of the node at | |
435 | * the given structure block offset. | |
436 | * | |
437 | * returns: | |
438 | * structure block offset of the property (>=0), on success | |
439 | * -FDT_ERR_NOTFOUND, if the requested node has no properties | |
440 | * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag | |
441 | * -FDT_ERR_BADMAGIC, | |
442 | * -FDT_ERR_BADVERSION, | |
443 | * -FDT_ERR_BADSTATE, | |
444 | * -FDT_ERR_BADSTRUCTURE, | |
445 | * -FDT_ERR_TRUNCATED, standard meanings. | |
446 | */ | |
447 | int fdt_first_property_offset(const void *fdt, int nodeoffset); | |
448 | ||
449 | /** | |
450 | * fdt_next_property_offset - step through a node's properties | |
451 | * @fdt: pointer to the device tree blob | |
452 | * @offset: structure block offset of a property | |
453 | * | |
454 | * fdt_next_property_offset() finds the property immediately after the | |
455 | * one at the given structure block offset. This will be a property | |
456 | * of the same node as the given property. | |
457 | * | |
458 | * returns: | |
459 | * structure block offset of the next property (>=0), on success | |
460 | * -FDT_ERR_NOTFOUND, if the given property is the last in its node | |
461 | * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag | |
462 | * -FDT_ERR_BADMAGIC, | |
463 | * -FDT_ERR_BADVERSION, | |
464 | * -FDT_ERR_BADSTATE, | |
465 | * -FDT_ERR_BADSTRUCTURE, | |
466 | * -FDT_ERR_TRUNCATED, standard meanings. | |
467 | */ | |
468 | int fdt_next_property_offset(const void *fdt, int offset); | |
469 | ||
67e610d9 MR |
470 | /** |
471 | * fdt_for_each_property - iterate over all properties of a node | |
472 | * @property_offset: property offset (int) | |
473 | * @fdt: FDT blob (const void *) | |
474 | * @node: node offset (int) | |
475 | * | |
476 | * This is actually a wrapper around a for loop and would be used like so: | |
477 | * | |
478 | * fdt_for_each_property(fdt, node, property) { | |
479 | * ... | |
480 | * use property | |
481 | * ... | |
482 | * } | |
483 | * | |
484 | * Note that this is implemented as a macro and property is used as | |
485 | * iterator in the loop. It should therefore be a locally allocated | |
486 | * variable. The node variable on the other hand is never modified, so | |
487 | * it can be constant or even a literal. | |
488 | */ | |
489 | #define fdt_for_each_property_offset(property, fdt, node) \ | |
490 | for (property = fdt_first_property_offset(fdt, node); \ | |
491 | property >= 0; \ | |
492 | property = fdt_next_property_offset(fdt, property)) | |
493 | ||
d1c63148 DG |
494 | /** |
495 | * fdt_get_property_by_offset - retrieve the property at a given offset | |
496 | * @fdt: pointer to the device tree blob | |
497 | * @offset: offset of the property to retrieve | |
498 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
499 | * | |
500 | * fdt_get_property_by_offset() retrieves a pointer to the | |
501 | * fdt_property structure within the device tree blob at the given | |
502 | * offset. If lenp is non-NULL, the length of the property value is | |
503 | * also returned, in the integer pointed to by lenp. | |
504 | * | |
505 | * returns: | |
506 | * pointer to the structure representing the property | |
507 | * if lenp is non-NULL, *lenp contains the length of the property | |
508 | * value (>=0) | |
509 | * NULL, on error | |
510 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
511 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag | |
512 | * -FDT_ERR_BADMAGIC, | |
513 | * -FDT_ERR_BADVERSION, | |
514 | * -FDT_ERR_BADSTATE, | |
515 | * -FDT_ERR_BADSTRUCTURE, | |
516 | * -FDT_ERR_TRUNCATED, standard meanings | |
517 | */ | |
518 | const struct fdt_property *fdt_get_property_by_offset(const void *fdt, | |
519 | int offset, | |
520 | int *lenp); | |
521 | ||
0219399a DG |
522 | /** |
523 | * fdt_get_property_namelen - find a property based on substring | |
524 | * @fdt: pointer to the device tree blob | |
525 | * @nodeoffset: offset of the node whose property to find | |
526 | * @name: name of the property to find | |
527 | * @namelen: number of characters of name to consider | |
528 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
529 | * | |
530 | * Identical to fdt_get_property_namelen(), but only examine the first | |
531 | * namelen characters of name for matching the property name. | |
532 | */ | |
533 | const struct fdt_property *fdt_get_property_namelen(const void *fdt, | |
534 | int nodeoffset, | |
535 | const char *name, | |
536 | int namelen, int *lenp); | |
537 | ||
8d04f02f KG |
538 | /** |
539 | * fdt_get_property - find a given property in a given node | |
540 | * @fdt: pointer to the device tree blob | |
541 | * @nodeoffset: offset of the node whose property to find | |
542 | * @name: name of the property to find | |
543 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
544 | * | |
545 | * fdt_get_property() retrieves a pointer to the fdt_property | |
546 | * structure within the device tree blob corresponding to the property | |
547 | * named 'name' of the node at offset nodeoffset. If lenp is | |
46390da1 | 548 | * non-NULL, the length of the property value is also returned, in the |
8d04f02f KG |
549 | * integer pointed to by lenp. |
550 | * | |
551 | * returns: | |
552 | * pointer to the structure representing the property | |
553 | * if lenp is non-NULL, *lenp contains the length of the property | |
554 | * value (>=0) | |
555 | * NULL, on error | |
556 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
557 | * -FDT_ERR_NOTFOUND, node does not have named property | |
558 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
559 | * -FDT_ERR_BADMAGIC, | |
560 | * -FDT_ERR_BADVERSION, | |
561 | * -FDT_ERR_BADSTATE, | |
562 | * -FDT_ERR_BADSTRUCTURE, | |
563 | * -FDT_ERR_TRUNCATED, standard meanings | |
564 | */ | |
565 | const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset, | |
566 | const char *name, int *lenp); | |
567 | static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset, | |
568 | const char *name, | |
569 | int *lenp) | |
570 | { | |
c6683026 DG |
571 | return (struct fdt_property *)(uintptr_t) |
572 | fdt_get_property(fdt, nodeoffset, name, lenp); | |
8d04f02f KG |
573 | } |
574 | ||
d1c63148 DG |
575 | /** |
576 | * fdt_getprop_by_offset - retrieve the value of a property at a given offset | |
577 | * @fdt: pointer to the device tree blob | |
578 | * @ffset: offset of the property to read | |
579 | * @namep: pointer to a string variable (will be overwritten) or NULL | |
580 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
581 | * | |
582 | * fdt_getprop_by_offset() retrieves a pointer to the value of the | |
583 | * property at structure block offset 'offset' (this will be a pointer | |
584 | * to within the device blob itself, not a copy of the value). If | |
585 | * lenp is non-NULL, the length of the property value is also | |
586 | * returned, in the integer pointed to by lenp. If namep is non-NULL, | |
587 | * the property's namne will also be returned in the char * pointed to | |
588 | * by namep (this will be a pointer to within the device tree's string | |
589 | * block, not a new copy of the name). | |
590 | * | |
591 | * returns: | |
592 | * pointer to the property's value | |
593 | * if lenp is non-NULL, *lenp contains the length of the property | |
594 | * value (>=0) | |
595 | * if namep is non-NULL *namep contiains a pointer to the property | |
596 | * name. | |
597 | * NULL, on error | |
598 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
599 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag | |
600 | * -FDT_ERR_BADMAGIC, | |
601 | * -FDT_ERR_BADVERSION, | |
602 | * -FDT_ERR_BADSTATE, | |
603 | * -FDT_ERR_BADSTRUCTURE, | |
604 | * -FDT_ERR_TRUNCATED, standard meanings | |
605 | */ | |
606 | const void *fdt_getprop_by_offset(const void *fdt, int offset, | |
607 | const char **namep, int *lenp); | |
608 | ||
0219399a DG |
609 | /** |
610 | * fdt_getprop_namelen - get property value based on substring | |
611 | * @fdt: pointer to the device tree blob | |
612 | * @nodeoffset: offset of the node whose property to find | |
613 | * @name: name of the property to find | |
614 | * @namelen: number of characters of name to consider | |
615 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
616 | * | |
617 | * Identical to fdt_getprop(), but only examine the first namelen | |
618 | * characters of name for matching the property name. | |
619 | */ | |
620 | const void *fdt_getprop_namelen(const void *fdt, int nodeoffset, | |
621 | const char *name, int namelen, int *lenp); | |
2b941bf9 MR |
622 | static inline void *fdt_getprop_namelen_w(void *fdt, int nodeoffset, |
623 | const char *name, int namelen, | |
624 | int *lenp) | |
625 | { | |
626 | return (void *)(uintptr_t)fdt_getprop_namelen(fdt, nodeoffset, name, | |
627 | namelen, lenp); | |
628 | } | |
0219399a | 629 | |
8d04f02f KG |
630 | /** |
631 | * fdt_getprop - retrieve the value of a given property | |
632 | * @fdt: pointer to the device tree blob | |
633 | * @nodeoffset: offset of the node whose property to find | |
634 | * @name: name of the property to find | |
635 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
636 | * | |
637 | * fdt_getprop() retrieves a pointer to the value of the property | |
638 | * named 'name' of the node at offset nodeoffset (this will be a | |
639 | * pointer to within the device blob itself, not a copy of the value). | |
46390da1 | 640 | * If lenp is non-NULL, the length of the property value is also |
8d04f02f KG |
641 | * returned, in the integer pointed to by lenp. |
642 | * | |
643 | * returns: | |
644 | * pointer to the property's value | |
645 | * if lenp is non-NULL, *lenp contains the length of the property | |
646 | * value (>=0) | |
647 | * NULL, on error | |
648 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
649 | * -FDT_ERR_NOTFOUND, node does not have named property | |
650 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
651 | * -FDT_ERR_BADMAGIC, | |
652 | * -FDT_ERR_BADVERSION, | |
653 | * -FDT_ERR_BADSTATE, | |
654 | * -FDT_ERR_BADSTRUCTURE, | |
655 | * -FDT_ERR_TRUNCATED, standard meanings | |
656 | */ | |
657 | const void *fdt_getprop(const void *fdt, int nodeoffset, | |
658 | const char *name, int *lenp); | |
659 | static inline void *fdt_getprop_w(void *fdt, int nodeoffset, | |
660 | const char *name, int *lenp) | |
661 | { | |
c6683026 | 662 | return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp); |
8d04f02f KG |
663 | } |
664 | ||
665 | /** | |
46390da1 | 666 | * fdt_get_phandle - retrieve the phandle of a given node |
8d04f02f KG |
667 | * @fdt: pointer to the device tree blob |
668 | * @nodeoffset: structure block offset of the node | |
669 | * | |
670 | * fdt_get_phandle() retrieves the phandle of the device tree node at | |
671 | * structure block offset nodeoffset. | |
672 | * | |
673 | * returns: | |
46390da1 | 674 | * the phandle of the node at nodeoffset, on success (!= 0, != -1) |
8d04f02f KG |
675 | * 0, if the node has no phandle, or another error occurs |
676 | */ | |
677 | uint32_t fdt_get_phandle(const void *fdt, int nodeoffset); | |
678 | ||
9a6cf73a | 679 | /** |
cd3cb0d9 | 680 | * fdt_get_alias_namelen - get alias based on substring |
9a6cf73a DG |
681 | * @fdt: pointer to the device tree blob |
682 | * @name: name of the alias th look up | |
683 | * @namelen: number of characters of name to consider | |
684 | * | |
685 | * Identical to fdt_get_alias(), but only examine the first namelen | |
686 | * characters of name for matching the alias name. | |
687 | */ | |
688 | const char *fdt_get_alias_namelen(const void *fdt, | |
689 | const char *name, int namelen); | |
690 | ||
691 | /** | |
0596d35d | 692 | * fdt_get_alias - retreive the path referenced by a given alias |
9a6cf73a | 693 | * @fdt: pointer to the device tree blob |
0596d35d | 694 | * @name: name of the alias th look up |
9a6cf73a DG |
695 | * |
696 | * fdt_get_alias() retrieves the value of a given alias. That is, the | |
697 | * value of the property named 'name' in the node /aliases. | |
698 | * | |
699 | * returns: | |
c73bd49d | 700 | * a pointer to the expansion of the alias named 'name', if it exists |
9a6cf73a DG |
701 | * NULL, if the given alias or the /aliases node does not exist |
702 | */ | |
703 | const char *fdt_get_alias(const void *fdt, const char *name); | |
704 | ||
8d04f02f KG |
705 | /** |
706 | * fdt_get_path - determine the full path of a node | |
707 | * @fdt: pointer to the device tree blob | |
708 | * @nodeoffset: offset of the node whose path to find | |
709 | * @buf: character buffer to contain the returned path (will be overwritten) | |
710 | * @buflen: size of the character buffer at buf | |
711 | * | |
712 | * fdt_get_path() computes the full path of the node at offset | |
713 | * nodeoffset, and records that path in the buffer at buf. | |
714 | * | |
715 | * NOTE: This function is expensive, as it must scan the device tree | |
716 | * structure from the start to nodeoffset. | |
717 | * | |
718 | * returns: | |
719 | * 0, on success | |
720 | * buf contains the absolute path of the node at | |
721 | * nodeoffset, as a NUL-terminated string. | |
53677ef1 | 722 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
723 | * -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1) |
724 | * characters and will not fit in the given buffer. | |
725 | * -FDT_ERR_BADMAGIC, | |
726 | * -FDT_ERR_BADVERSION, | |
727 | * -FDT_ERR_BADSTATE, | |
728 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
729 | */ | |
730 | int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen); | |
731 | ||
732 | /** | |
733 | * fdt_supernode_atdepth_offset - find a specific ancestor of a node | |
734 | * @fdt: pointer to the device tree blob | |
735 | * @nodeoffset: offset of the node whose parent to find | |
736 | * @supernodedepth: depth of the ancestor to find | |
737 | * @nodedepth: pointer to an integer variable (will be overwritten) or NULL | |
738 | * | |
739 | * fdt_supernode_atdepth_offset() finds an ancestor of the given node | |
740 | * at a specific depth from the root (where the root itself has depth | |
741 | * 0, its immediate subnodes depth 1 and so forth). So | |
742 | * fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL); | |
743 | * will always return 0, the offset of the root node. If the node at | |
744 | * nodeoffset has depth D, then: | |
745 | * fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL); | |
746 | * will return nodeoffset itself. | |
747 | * | |
748 | * NOTE: This function is expensive, as it must scan the device tree | |
749 | * structure from the start to nodeoffset. | |
750 | * | |
751 | * returns: | |
752 | ||
753 | * structure block offset of the node at node offset's ancestor | |
754 | * of depth supernodedepth (>=0), on success | |
53677ef1 | 755 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
756 | * -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset |
757 | * -FDT_ERR_BADMAGIC, | |
758 | * -FDT_ERR_BADVERSION, | |
759 | * -FDT_ERR_BADSTATE, | |
760 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
761 | */ | |
762 | int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset, | |
763 | int supernodedepth, int *nodedepth); | |
764 | ||
765 | /** | |
766 | * fdt_node_depth - find the depth of a given node | |
767 | * @fdt: pointer to the device tree blob | |
768 | * @nodeoffset: offset of the node whose parent to find | |
769 | * | |
770 | * fdt_node_depth() finds the depth of a given node. The root node | |
771 | * has depth 0, its immediate subnodes depth 1 and so forth. | |
772 | * | |
773 | * NOTE: This function is expensive, as it must scan the device tree | |
774 | * structure from the start to nodeoffset. | |
775 | * | |
776 | * returns: | |
777 | * depth of the node at nodeoffset (>=0), on success | |
53677ef1 | 778 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
779 | * -FDT_ERR_BADMAGIC, |
780 | * -FDT_ERR_BADVERSION, | |
781 | * -FDT_ERR_BADSTATE, | |
782 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
783 | */ | |
784 | int fdt_node_depth(const void *fdt, int nodeoffset); | |
785 | ||
786 | /** | |
787 | * fdt_parent_offset - find the parent of a given node | |
788 | * @fdt: pointer to the device tree blob | |
789 | * @nodeoffset: offset of the node whose parent to find | |
790 | * | |
791 | * fdt_parent_offset() locates the parent node of a given node (that | |
792 | * is, it finds the offset of the node which contains the node at | |
793 | * nodeoffset as a subnode). | |
794 | * | |
795 | * NOTE: This function is expensive, as it must scan the device tree | |
796 | * structure from the start to nodeoffset, *twice*. | |
797 | * | |
798 | * returns: | |
46390da1 | 799 | * structure block offset of the parent of the node at nodeoffset |
8d04f02f | 800 | * (>=0), on success |
53677ef1 | 801 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
802 | * -FDT_ERR_BADMAGIC, |
803 | * -FDT_ERR_BADVERSION, | |
804 | * -FDT_ERR_BADSTATE, | |
805 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
806 | */ | |
807 | int fdt_parent_offset(const void *fdt, int nodeoffset); | |
808 | ||
809 | /** | |
810 | * fdt_node_offset_by_prop_value - find nodes with a given property value | |
811 | * @fdt: pointer to the device tree blob | |
812 | * @startoffset: only find nodes after this offset | |
813 | * @propname: property name to check | |
814 | * @propval: property value to search for | |
815 | * @proplen: length of the value in propval | |
816 | * | |
817 | * fdt_node_offset_by_prop_value() returns the offset of the first | |
818 | * node after startoffset, which has a property named propname whose | |
819 | * value is of length proplen and has value equal to propval; or if | |
820 | * startoffset is -1, the very first such node in the tree. | |
821 | * | |
822 | * To iterate through all nodes matching the criterion, the following | |
823 | * idiom can be used: | |
824 | * offset = fdt_node_offset_by_prop_value(fdt, -1, propname, | |
825 | * propval, proplen); | |
826 | * while (offset != -FDT_ERR_NOTFOUND) { | |
0596d35d | 827 | * // other code here |
8d04f02f KG |
828 | * offset = fdt_node_offset_by_prop_value(fdt, offset, propname, |
829 | * propval, proplen); | |
830 | * } | |
831 | * | |
832 | * Note the -1 in the first call to the function, if 0 is used here | |
833 | * instead, the function will never locate the root node, even if it | |
834 | * matches the criterion. | |
835 | * | |
836 | * returns: | |
837 | * structure block offset of the located node (>= 0, >startoffset), | |
838 | * on success | |
839 | * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the | |
840 | * tree after startoffset | |
53677ef1 | 841 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
842 | * -FDT_ERR_BADMAGIC, |
843 | * -FDT_ERR_BADVERSION, | |
844 | * -FDT_ERR_BADSTATE, | |
845 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
846 | */ | |
847 | int fdt_node_offset_by_prop_value(const void *fdt, int startoffset, | |
848 | const char *propname, | |
849 | const void *propval, int proplen); | |
850 | ||
851 | /** | |
852 | * fdt_node_offset_by_phandle - find the node with a given phandle | |
853 | * @fdt: pointer to the device tree blob | |
854 | * @phandle: phandle value | |
855 | * | |
46390da1 | 856 | * fdt_node_offset_by_phandle() returns the offset of the node |
8d04f02f KG |
857 | * which has the given phandle value. If there is more than one node |
858 | * in the tree with the given phandle (an invalid tree), results are | |
859 | * undefined. | |
860 | * | |
861 | * returns: | |
862 | * structure block offset of the located node (>= 0), on success | |
863 | * -FDT_ERR_NOTFOUND, no node with that phandle exists | |
864 | * -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1) | |
865 | * -FDT_ERR_BADMAGIC, | |
866 | * -FDT_ERR_BADVERSION, | |
867 | * -FDT_ERR_BADSTATE, | |
868 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
869 | */ | |
870 | int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle); | |
871 | ||
872 | /** | |
873 | * fdt_node_check_compatible: check a node's compatible property | |
874 | * @fdt: pointer to the device tree blob | |
875 | * @nodeoffset: offset of a tree node | |
876 | * @compatible: string to match against | |
877 | * | |
878 | * | |
879 | * fdt_node_check_compatible() returns 0 if the given node contains a | |
880 | * 'compatible' property with the given string as one of its elements, | |
881 | * it returns non-zero otherwise, or on error. | |
882 | * | |
883 | * returns: | |
884 | * 0, if the node has a 'compatible' property listing the given string | |
885 | * 1, if the node has a 'compatible' property, but it does not list | |
886 | * the given string | |
887 | * -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property | |
53677ef1 | 888 | * -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
889 | * -FDT_ERR_BADMAGIC, |
890 | * -FDT_ERR_BADVERSION, | |
891 | * -FDT_ERR_BADSTATE, | |
892 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
893 | */ | |
894 | int fdt_node_check_compatible(const void *fdt, int nodeoffset, | |
895 | const char *compatible); | |
7cd5da0f | 896 | |
8d04f02f KG |
897 | /** |
898 | * fdt_node_offset_by_compatible - find nodes with a given 'compatible' value | |
899 | * @fdt: pointer to the device tree blob | |
900 | * @startoffset: only find nodes after this offset | |
901 | * @compatible: 'compatible' string to match against | |
902 | * | |
903 | * fdt_node_offset_by_compatible() returns the offset of the first | |
904 | * node after startoffset, which has a 'compatible' property which | |
905 | * lists the given compatible string; or if startoffset is -1, the | |
906 | * very first such node in the tree. | |
907 | * | |
908 | * To iterate through all nodes matching the criterion, the following | |
909 | * idiom can be used: | |
910 | * offset = fdt_node_offset_by_compatible(fdt, -1, compatible); | |
911 | * while (offset != -FDT_ERR_NOTFOUND) { | |
0596d35d | 912 | * // other code here |
8d04f02f KG |
913 | * offset = fdt_node_offset_by_compatible(fdt, offset, compatible); |
914 | * } | |
915 | * | |
916 | * Note the -1 in the first call to the function, if 0 is used here | |
917 | * instead, the function will never locate the root node, even if it | |
918 | * matches the criterion. | |
919 | * | |
920 | * returns: | |
921 | * structure block offset of the located node (>= 0, >startoffset), | |
922 | * on success | |
923 | * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the | |
924 | * tree after startoffset | |
53677ef1 | 925 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
926 | * -FDT_ERR_BADMAGIC, |
927 | * -FDT_ERR_BADVERSION, | |
928 | * -FDT_ERR_BADSTATE, | |
929 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
930 | */ | |
931 | int fdt_node_offset_by_compatible(const void *fdt, int startoffset, | |
932 | const char *compatible); | |
7cd5da0f | 933 | |
e853b324 SG |
934 | /** |
935 | * fdt_stringlist_contains - check a string list property for a string | |
936 | * @strlist: Property containing a list of strings to check | |
937 | * @listlen: Length of property | |
938 | * @str: String to search for | |
939 | * | |
940 | * This is a utility function provided for convenience. The list contains | |
941 | * one or more strings, each terminated by \0, as is found in a device tree | |
942 | * "compatible" property. | |
943 | * | |
944 | * @return: 1 if the string is found in the list, 0 not found, or invalid list | |
945 | */ | |
946 | int fdt_stringlist_contains(const char *strlist, int listlen, const char *str); | |
947 | ||
bc4147ab TR |
948 | /** |
949 | * fdt_count_strings - count the number of strings in a string list | |
950 | * @fdt: pointer to the device tree blob | |
951 | * @node: offset of the node | |
952 | * @property: name of the property containing the string list | |
953 | * @return: the number of strings in the given property | |
954 | */ | |
955 | int fdt_count_strings(const void *fdt, int node, const char *property); | |
956 | ||
fc503c17 TR |
957 | /** |
958 | * fdt_find_string - find a string in a string list and return its index | |
959 | * @fdt: pointer to the device tree blob | |
960 | * @node: offset of the node | |
961 | * @property: name of the property containing the string list | |
962 | * @string: string to look up in the string list | |
963 | * @return: the index of the string or negative on error | |
964 | */ | |
965 | int fdt_find_string(const void *fdt, int node, const char *property, | |
966 | const char *string); | |
967 | ||
5094eb40 TR |
968 | /** |
969 | * fdt_get_string_index() - obtain the string at a given index in a string list | |
970 | * @fdt: pointer to the device tree blob | |
971 | * @node: offset of the node | |
972 | * @property: name of the property containing the string list | |
973 | * @index: index of the string to return | |
974 | * @output: return location for the string | |
975 | * @return: 0 if the string was found or a negative error code otherwise | |
976 | */ | |
977 | int fdt_get_string_index(const void *fdt, int node, const char *property, | |
978 | int index, const char **output); | |
979 | ||
980 | /** | |
965fab1a | 981 | * fdt_get_string() - obtain the first string in a string list |
5094eb40 TR |
982 | * @fdt: pointer to the device tree blob |
983 | * @node: offset of the node | |
984 | * @property: name of the property containing the string list | |
985 | * @output: return location for the string | |
986 | * @return: 0 if the string was found or a negative error code otherwise | |
987 | * | |
988 | * This is a shortcut for: | |
989 | * | |
990 | * fdt_get_string_index(fdt, node, property, 0, output). | |
991 | */ | |
992 | int fdt_get_string(const void *fdt, int node, const char *property, | |
993 | const char **output); | |
994 | ||
0596d35d SG |
995 | /**********************************************************************/ |
996 | /* Read-only functions (addressing related) */ | |
997 | /**********************************************************************/ | |
998 | ||
999 | /** | |
1000 | * FDT_MAX_NCELLS - maximum value for #address-cells and #size-cells | |
1001 | * | |
1002 | * This is the maximum value for #address-cells, #size-cells and | |
1003 | * similar properties that will be processed by libfdt. IEE1275 | |
1004 | * requires that OF implementations handle values up to 4. | |
1005 | * Implementations may support larger values, but in practice higher | |
1006 | * values aren't used. | |
1007 | */ | |
1008 | #define FDT_MAX_NCELLS 4 | |
1009 | ||
1010 | /** | |
1011 | * fdt_address_cells - retrieve address size for a bus represented in the tree | |
1012 | * @fdt: pointer to the device tree blob | |
1013 | * @nodeoffset: offset of the node to find the address size for | |
1014 | * | |
1015 | * When the node has a valid #address-cells property, returns its value. | |
1016 | * | |
1017 | * returns: | |
1018 | * 0 <= n < FDT_MAX_NCELLS, on success | |
1019 | * 2, if the node has no #address-cells property | |
1020 | * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid | |
1021 | * #address-cells property | |
1022 | * -FDT_ERR_BADMAGIC, | |
1023 | * -FDT_ERR_BADVERSION, | |
1024 | * -FDT_ERR_BADSTATE, | |
1025 | * -FDT_ERR_BADSTRUCTURE, | |
1026 | * -FDT_ERR_TRUNCATED, standard meanings | |
1027 | */ | |
1028 | int fdt_address_cells(const void *fdt, int nodeoffset); | |
1029 | ||
1030 | /** | |
1031 | * fdt_size_cells - retrieve address range size for a bus represented in the | |
1032 | * tree | |
1033 | * @fdt: pointer to the device tree blob | |
1034 | * @nodeoffset: offset of the node to find the address range size for | |
1035 | * | |
1036 | * When the node has a valid #size-cells property, returns its value. | |
1037 | * | |
1038 | * returns: | |
1039 | * 0 <= n < FDT_MAX_NCELLS, on success | |
1040 | * 2, if the node has no #address-cells property | |
1041 | * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid | |
1042 | * #size-cells property | |
1043 | * -FDT_ERR_BADMAGIC, | |
1044 | * -FDT_ERR_BADVERSION, | |
1045 | * -FDT_ERR_BADSTATE, | |
1046 | * -FDT_ERR_BADSTRUCTURE, | |
1047 | * -FDT_ERR_TRUNCATED, standard meanings | |
1048 | */ | |
1049 | int fdt_size_cells(const void *fdt, int nodeoffset); | |
1050 | ||
1051 | ||
8d04f02f KG |
1052 | /**********************************************************************/ |
1053 | /* Write-in-place functions */ | |
1054 | /**********************************************************************/ | |
3af0d587 | 1055 | |
ea7b1a21 MR |
1056 | /** |
1057 | * fdt_setprop_inplace_namelen_partial - change a property's value, | |
1058 | * but not its size | |
1059 | * @fdt: pointer to the device tree blob | |
1060 | * @nodeoffset: offset of the node whose property to change | |
1061 | * @name: name of the property to change | |
1062 | * @namelen: number of characters of name to consider | |
1063 | * @index: index of the property to change in the array | |
1064 | * @val: pointer to data to replace the property value with | |
1065 | * @len: length of the property value | |
1066 | * | |
1067 | * Identical to fdt_setprop_inplace(), but modifies the given property | |
1068 | * starting from the given index, and using only the first characters | |
1069 | * of the name. It is useful when you want to manipulate only one value of | |
1070 | * an array and you have a string that doesn't end with \0. | |
1071 | */ | |
1072 | int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset, | |
1073 | const char *name, int namelen, | |
1074 | uint32_t index, const void *val, | |
1075 | int len); | |
1076 | ||
9d4450b5 DG |
1077 | /** |
1078 | * fdt_setprop_inplace - change a property's value, but not its size | |
1079 | * @fdt: pointer to the device tree blob | |
1080 | * @nodeoffset: offset of the node whose property to change | |
1081 | * @name: name of the property to change | |
1082 | * @val: pointer to data to replace the property value with | |
1083 | * @len: length of the property value | |
1084 | * | |
1085 | * fdt_setprop_inplace() replaces the value of a given property with | |
1086 | * the data in val, of length len. This function cannot change the | |
1087 | * size of a property, and so will only work if len is equal to the | |
1088 | * current length of the property. | |
1089 | * | |
1090 | * This function will alter only the bytes in the blob which contain | |
1091 | * the given property value, and will not alter or move any other part | |
1092 | * of the tree. | |
1093 | * | |
1094 | * returns: | |
1095 | * 0, on success | |
1096 | * -FDT_ERR_NOSPACE, if len is not equal to the property's current length | |
1097 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1098 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1099 | * -FDT_ERR_BADMAGIC, | |
1100 | * -FDT_ERR_BADVERSION, | |
1101 | * -FDT_ERR_BADSTATE, | |
1102 | * -FDT_ERR_BADSTRUCTURE, | |
1103 | * -FDT_ERR_TRUNCATED, standard meanings | |
1104 | */ | |
7cd5da0f GVB |
1105 | int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, |
1106 | const void *val, int len); | |
9d4450b5 DG |
1107 | |
1108 | /** | |
24fa0e58 | 1109 | * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property |
9d4450b5 DG |
1110 | * @fdt: pointer to the device tree blob |
1111 | * @nodeoffset: offset of the node whose property to change | |
1112 | * @name: name of the property to change | |
24fa0e58 | 1113 | * @val: 32-bit integer value to replace the property with |
9d4450b5 | 1114 | * |
24fa0e58 DG |
1115 | * fdt_setprop_inplace_u32() replaces the value of a given property |
1116 | * with the 32-bit integer value in val, converting val to big-endian | |
1117 | * if necessary. This function cannot change the size of a property, | |
1118 | * and so will only work if the property already exists and has length | |
1119 | * 4. | |
9d4450b5 DG |
1120 | * |
1121 | * This function will alter only the bytes in the blob which contain | |
1122 | * the given property value, and will not alter or move any other part | |
1123 | * of the tree. | |
1124 | * | |
1125 | * returns: | |
1126 | * 0, on success | |
1127 | * -FDT_ERR_NOSPACE, if the property's length is not equal to 4 | |
24fa0e58 | 1128 | * -FDT_ERR_NOTFOUND, node does not have the named property |
9d4450b5 DG |
1129 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
1130 | * -FDT_ERR_BADMAGIC, | |
1131 | * -FDT_ERR_BADVERSION, | |
1132 | * -FDT_ERR_BADSTATE, | |
1133 | * -FDT_ERR_BADSTRUCTURE, | |
1134 | * -FDT_ERR_TRUNCATED, standard meanings | |
1135 | */ | |
24fa0e58 DG |
1136 | static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset, |
1137 | const char *name, uint32_t val) | |
8d04f02f | 1138 | { |
b2ba62a1 KP |
1139 | fdt32_t tmp = cpu_to_fdt32(val); |
1140 | return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
8d04f02f | 1141 | } |
7cd5da0f | 1142 | |
24fa0e58 DG |
1143 | /** |
1144 | * fdt_setprop_inplace_u64 - change the value of a 64-bit integer property | |
1145 | * @fdt: pointer to the device tree blob | |
1146 | * @nodeoffset: offset of the node whose property to change | |
1147 | * @name: name of the property to change | |
1148 | * @val: 64-bit integer value to replace the property with | |
1149 | * | |
1150 | * fdt_setprop_inplace_u64() replaces the value of a given property | |
1151 | * with the 64-bit integer value in val, converting val to big-endian | |
1152 | * if necessary. This function cannot change the size of a property, | |
1153 | * and so will only work if the property already exists and has length | |
1154 | * 8. | |
1155 | * | |
1156 | * This function will alter only the bytes in the blob which contain | |
1157 | * the given property value, and will not alter or move any other part | |
1158 | * of the tree. | |
1159 | * | |
1160 | * returns: | |
1161 | * 0, on success | |
1162 | * -FDT_ERR_NOSPACE, if the property's length is not equal to 8 | |
1163 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1164 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1165 | * -FDT_ERR_BADMAGIC, | |
1166 | * -FDT_ERR_BADVERSION, | |
1167 | * -FDT_ERR_BADSTATE, | |
1168 | * -FDT_ERR_BADSTRUCTURE, | |
1169 | * -FDT_ERR_TRUNCATED, standard meanings | |
1170 | */ | |
1171 | static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset, | |
1172 | const char *name, uint64_t val) | |
1173 | { | |
b2ba62a1 KP |
1174 | fdt64_t tmp = cpu_to_fdt64(val); |
1175 | return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1176 | } |
1177 | ||
1178 | /** | |
1179 | * fdt_setprop_inplace_cell - change the value of a single-cell property | |
1180 | * | |
1181 | * This is an alternative name for fdt_setprop_inplace_u32() | |
1182 | */ | |
1183 | static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset, | |
1184 | const char *name, uint32_t val) | |
1185 | { | |
1186 | return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val); | |
1187 | } | |
1188 | ||
9d4450b5 DG |
1189 | /** |
1190 | * fdt_nop_property - replace a property with nop tags | |
1191 | * @fdt: pointer to the device tree blob | |
1192 | * @nodeoffset: offset of the node whose property to nop | |
1193 | * @name: name of the property to nop | |
1194 | * | |
1195 | * fdt_nop_property() will replace a given property's representation | |
1196 | * in the blob with FDT_NOP tags, effectively removing it from the | |
1197 | * tree. | |
1198 | * | |
1199 | * This function will alter only the bytes in the blob which contain | |
1200 | * the property, and will not alter or move any other part of the | |
1201 | * tree. | |
1202 | * | |
1203 | * returns: | |
1204 | * 0, on success | |
1205 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1206 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1207 | * -FDT_ERR_BADMAGIC, | |
1208 | * -FDT_ERR_BADVERSION, | |
1209 | * -FDT_ERR_BADSTATE, | |
1210 | * -FDT_ERR_BADSTRUCTURE, | |
1211 | * -FDT_ERR_TRUNCATED, standard meanings | |
1212 | */ | |
7cd5da0f | 1213 | int fdt_nop_property(void *fdt, int nodeoffset, const char *name); |
9d4450b5 DG |
1214 | |
1215 | /** | |
1216 | * fdt_nop_node - replace a node (subtree) with nop tags | |
1217 | * @fdt: pointer to the device tree blob | |
1218 | * @nodeoffset: offset of the node to nop | |
1219 | * | |
1220 | * fdt_nop_node() will replace a given node's representation in the | |
1221 | * blob, including all its subnodes, if any, with FDT_NOP tags, | |
1222 | * effectively removing it from the tree. | |
1223 | * | |
1224 | * This function will alter only the bytes in the blob which contain | |
1225 | * the node and its properties and subnodes, and will not alter or | |
1226 | * move any other part of the tree. | |
1227 | * | |
1228 | * returns: | |
1229 | * 0, on success | |
1230 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1231 | * -FDT_ERR_BADMAGIC, | |
1232 | * -FDT_ERR_BADVERSION, | |
1233 | * -FDT_ERR_BADSTATE, | |
1234 | * -FDT_ERR_BADSTRUCTURE, | |
1235 | * -FDT_ERR_TRUNCATED, standard meanings | |
1236 | */ | |
7cd5da0f | 1237 | int fdt_nop_node(void *fdt, int nodeoffset); |
3f9f08cf | 1238 | |
8d04f02f KG |
1239 | /**********************************************************************/ |
1240 | /* Sequential write functions */ | |
1241 | /**********************************************************************/ | |
7cd5da0f | 1242 | |
7cd5da0f | 1243 | int fdt_create(void *buf, int bufsize); |
0596d35d | 1244 | int fdt_resize(void *fdt, void *buf, int bufsize); |
7cd5da0f GVB |
1245 | int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size); |
1246 | int fdt_finish_reservemap(void *fdt); | |
1247 | int fdt_begin_node(void *fdt, const char *name); | |
1248 | int fdt_property(void *fdt, const char *name, const void *val, int len); | |
24fa0e58 | 1249 | static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val) |
8d04f02f | 1250 | { |
b2ba62a1 KP |
1251 | fdt32_t tmp = cpu_to_fdt32(val); |
1252 | return fdt_property(fdt, name, &tmp, sizeof(tmp)); | |
8d04f02f | 1253 | } |
24fa0e58 DG |
1254 | static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val) |
1255 | { | |
b2ba62a1 KP |
1256 | fdt64_t tmp = cpu_to_fdt64(val); |
1257 | return fdt_property(fdt, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1258 | } |
1259 | static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val) | |
1260 | { | |
1261 | return fdt_property_u32(fdt, name, val); | |
1262 | } | |
f8a2d7a4 SG |
1263 | |
1264 | /** | |
1265 | * fdt_property_placeholder - add a new property and return a ptr to its value | |
1266 | * | |
1267 | * @fdt: pointer to the device tree blob | |
1268 | * @name: name of property to add | |
1269 | * @len: length of property value in bytes | |
1270 | * @valp: returns a pointer to where where the value should be placed | |
1271 | * | |
1272 | * returns: | |
1273 | * 0, on success | |
1274 | * -FDT_ERR_BADMAGIC, | |
1275 | * -FDT_ERR_NOSPACE, standard meanings | |
1276 | */ | |
1277 | int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp); | |
1278 | ||
7cd5da0f GVB |
1279 | #define fdt_property_string(fdt, name, str) \ |
1280 | fdt_property(fdt, name, str, strlen(str)+1) | |
1281 | int fdt_end_node(void *fdt); | |
1282 | int fdt_finish(void *fdt); | |
1283 | ||
8d04f02f KG |
1284 | /**********************************************************************/ |
1285 | /* Read-write functions */ | |
1286 | /**********************************************************************/ | |
1287 | ||
c71b64f3 | 1288 | int fdt_create_empty_tree(void *buf, int bufsize); |
8d04f02f | 1289 | int fdt_open_into(const void *fdt, void *buf, int bufsize); |
7cd5da0f GVB |
1290 | int fdt_pack(void *fdt); |
1291 | ||
aec7135b DG |
1292 | /** |
1293 | * fdt_add_mem_rsv - add one memory reserve map entry | |
1294 | * @fdt: pointer to the device tree blob | |
46390da1 | 1295 | * @address, @size: 64-bit values (native endian) |
aec7135b DG |
1296 | * |
1297 | * Adds a reserve map entry to the given blob reserving a region at | |
1298 | * address address of length size. | |
1299 | * | |
1300 | * This function will insert data into the reserve map and will | |
46390da1 | 1301 | * therefore change the indexes of some entries in the table. |
aec7135b DG |
1302 | * |
1303 | * returns: | |
1304 | * 0, on success | |
1305 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1306 | * contain the new reservation entry | |
1307 | * -FDT_ERR_BADMAGIC, | |
1308 | * -FDT_ERR_BADVERSION, | |
1309 | * -FDT_ERR_BADSTATE, | |
1310 | * -FDT_ERR_BADSTRUCTURE, | |
1311 | * -FDT_ERR_BADLAYOUT, | |
1312 | * -FDT_ERR_TRUNCATED, standard meanings | |
1313 | */ | |
8d04f02f | 1314 | int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size); |
aec7135b DG |
1315 | |
1316 | /** | |
1317 | * fdt_del_mem_rsv - remove a memory reserve map entry | |
1318 | * @fdt: pointer to the device tree blob | |
1319 | * @n: entry to remove | |
1320 | * | |
1321 | * fdt_del_mem_rsv() removes the n-th memory reserve map entry from | |
1322 | * the blob. | |
1323 | * | |
1324 | * This function will delete data from the reservation table and will | |
46390da1 | 1325 | * therefore change the indexes of some entries in the table. |
aec7135b DG |
1326 | * |
1327 | * returns: | |
1328 | * 0, on success | |
1329 | * -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there | |
1330 | * are less than n+1 reserve map entries) | |
1331 | * -FDT_ERR_BADMAGIC, | |
1332 | * -FDT_ERR_BADVERSION, | |
1333 | * -FDT_ERR_BADSTATE, | |
1334 | * -FDT_ERR_BADSTRUCTURE, | |
1335 | * -FDT_ERR_BADLAYOUT, | |
1336 | * -FDT_ERR_TRUNCATED, standard meanings | |
1337 | */ | |
8d04f02f KG |
1338 | int fdt_del_mem_rsv(void *fdt, int n); |
1339 | ||
9eaeb07a DG |
1340 | /** |
1341 | * fdt_set_name - change the name of a given node | |
1342 | * @fdt: pointer to the device tree blob | |
1343 | * @nodeoffset: structure block offset of a node | |
1344 | * @name: name to give the node | |
1345 | * | |
1346 | * fdt_set_name() replaces the name (including unit address, if any) | |
1347 | * of the given node with the given string. NOTE: this function can't | |
1348 | * efficiently check if the new name is unique amongst the given | |
1349 | * node's siblings; results are undefined if this function is invoked | |
1350 | * with a name equal to one of the given node's siblings. | |
1351 | * | |
1352 | * This function may insert or delete data from the blob, and will | |
1353 | * therefore change the offsets of some existing nodes. | |
1354 | * | |
1355 | * returns: | |
1356 | * 0, on success | |
1357 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob | |
1358 | * to contain the new name | |
1359 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1360 | * -FDT_ERR_BADMAGIC, | |
1361 | * -FDT_ERR_BADVERSION, | |
1362 | * -FDT_ERR_BADSTATE, standard meanings | |
1363 | */ | |
1364 | int fdt_set_name(void *fdt, int nodeoffset, const char *name); | |
1365 | ||
aec7135b DG |
1366 | /** |
1367 | * fdt_setprop - create or change a property | |
1368 | * @fdt: pointer to the device tree blob | |
1369 | * @nodeoffset: offset of the node whose property to change | |
1370 | * @name: name of the property to change | |
1371 | * @val: pointer to data to set the property value to | |
1372 | * @len: length of the property value | |
1373 | * | |
1374 | * fdt_setprop() sets the value of the named property in the given | |
46390da1 | 1375 | * node to the given value and length, creating the property if it |
aec7135b DG |
1376 | * does not already exist. |
1377 | * | |
1378 | * This function may insert or delete data from the blob, and will | |
1379 | * therefore change the offsets of some existing nodes. | |
1380 | * | |
1381 | * returns: | |
1382 | * 0, on success | |
1383 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1384 | * contain the new property value | |
1385 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1386 | * -FDT_ERR_BADLAYOUT, | |
1387 | * -FDT_ERR_BADMAGIC, | |
1388 | * -FDT_ERR_BADVERSION, | |
1389 | * -FDT_ERR_BADSTATE, | |
1390 | * -FDT_ERR_BADSTRUCTURE, | |
1391 | * -FDT_ERR_BADLAYOUT, | |
1392 | * -FDT_ERR_TRUNCATED, standard meanings | |
1393 | */ | |
7cd5da0f GVB |
1394 | int fdt_setprop(void *fdt, int nodeoffset, const char *name, |
1395 | const void *val, int len); | |
aec7135b DG |
1396 | |
1397 | /** | |
24fa0e58 | 1398 | * fdt_setprop_u32 - set a property to a 32-bit integer |
aec7135b DG |
1399 | * @fdt: pointer to the device tree blob |
1400 | * @nodeoffset: offset of the node whose property to change | |
1401 | * @name: name of the property to change | |
1402 | * @val: 32-bit integer value for the property (native endian) | |
1403 | * | |
24fa0e58 DG |
1404 | * fdt_setprop_u32() sets the value of the named property in the given |
1405 | * node to the given 32-bit integer value (converting to big-endian if | |
aec7135b DG |
1406 | * necessary), or creates a new property with that value if it does |
1407 | * not already exist. | |
1408 | * | |
1409 | * This function may insert or delete data from the blob, and will | |
1410 | * therefore change the offsets of some existing nodes. | |
1411 | * | |
1412 | * returns: | |
1413 | * 0, on success | |
1414 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1415 | * contain the new property value | |
1416 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1417 | * -FDT_ERR_BADLAYOUT, | |
1418 | * -FDT_ERR_BADMAGIC, | |
1419 | * -FDT_ERR_BADVERSION, | |
1420 | * -FDT_ERR_BADSTATE, | |
1421 | * -FDT_ERR_BADSTRUCTURE, | |
1422 | * -FDT_ERR_BADLAYOUT, | |
1423 | * -FDT_ERR_TRUNCATED, standard meanings | |
1424 | */ | |
24fa0e58 DG |
1425 | static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name, |
1426 | uint32_t val) | |
8d04f02f | 1427 | { |
b2ba62a1 KP |
1428 | fdt32_t tmp = cpu_to_fdt32(val); |
1429 | return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
8d04f02f | 1430 | } |
aec7135b | 1431 | |
24fa0e58 DG |
1432 | /** |
1433 | * fdt_setprop_u64 - set a property to a 64-bit integer | |
1434 | * @fdt: pointer to the device tree blob | |
1435 | * @nodeoffset: offset of the node whose property to change | |
1436 | * @name: name of the property to change | |
1437 | * @val: 64-bit integer value for the property (native endian) | |
1438 | * | |
1439 | * fdt_setprop_u64() sets the value of the named property in the given | |
1440 | * node to the given 64-bit integer value (converting to big-endian if | |
1441 | * necessary), or creates a new property with that value if it does | |
1442 | * not already exist. | |
1443 | * | |
1444 | * This function may insert or delete data from the blob, and will | |
1445 | * therefore change the offsets of some existing nodes. | |
1446 | * | |
1447 | * returns: | |
1448 | * 0, on success | |
1449 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1450 | * contain the new property value | |
1451 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1452 | * -FDT_ERR_BADLAYOUT, | |
1453 | * -FDT_ERR_BADMAGIC, | |
1454 | * -FDT_ERR_BADVERSION, | |
1455 | * -FDT_ERR_BADSTATE, | |
1456 | * -FDT_ERR_BADSTRUCTURE, | |
1457 | * -FDT_ERR_BADLAYOUT, | |
1458 | * -FDT_ERR_TRUNCATED, standard meanings | |
1459 | */ | |
1460 | static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name, | |
1461 | uint64_t val) | |
1462 | { | |
b2ba62a1 KP |
1463 | fdt64_t tmp = cpu_to_fdt64(val); |
1464 | return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1465 | } |
1466 | ||
1467 | /** | |
1468 | * fdt_setprop_cell - set a property to a single cell value | |
1469 | * | |
1470 | * This is an alternative name for fdt_setprop_u32() | |
1471 | */ | |
1472 | static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name, | |
1473 | uint32_t val) | |
1474 | { | |
1475 | return fdt_setprop_u32(fdt, nodeoffset, name, val); | |
1476 | } | |
1477 | ||
aec7135b DG |
1478 | /** |
1479 | * fdt_setprop_string - set a property to a string value | |
1480 | * @fdt: pointer to the device tree blob | |
1481 | * @nodeoffset: offset of the node whose property to change | |
1482 | * @name: name of the property to change | |
1483 | * @str: string value for the property | |
1484 | * | |
1485 | * fdt_setprop_string() sets the value of the named property in the | |
1486 | * given node to the given string value (using the length of the | |
1487 | * string to determine the new length of the property), or creates a | |
1488 | * new property with that value if it does not already exist. | |
1489 | * | |
1490 | * This function may insert or delete data from the blob, and will | |
1491 | * therefore change the offsets of some existing nodes. | |
1492 | * | |
1493 | * returns: | |
1494 | * 0, on success | |
1495 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1496 | * contain the new property value | |
1497 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1498 | * -FDT_ERR_BADLAYOUT, | |
1499 | * -FDT_ERR_BADMAGIC, | |
1500 | * -FDT_ERR_BADVERSION, | |
1501 | * -FDT_ERR_BADSTATE, | |
1502 | * -FDT_ERR_BADSTRUCTURE, | |
1503 | * -FDT_ERR_BADLAYOUT, | |
1504 | * -FDT_ERR_TRUNCATED, standard meanings | |
1505 | */ | |
7cd5da0f GVB |
1506 | #define fdt_setprop_string(fdt, nodeoffset, name, str) \ |
1507 | fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) | |
aec7135b | 1508 | |
36ad18a6 ML |
1509 | /** |
1510 | * fdt_appendprop - append to or create a property | |
1511 | * @fdt: pointer to the device tree blob | |
1512 | * @nodeoffset: offset of the node whose property to change | |
1513 | * @name: name of the property to append to | |
1514 | * @val: pointer to data to append to the property value | |
1515 | * @len: length of the data to append to the property value | |
1516 | * | |
1517 | * fdt_appendprop() appends the value to the named property in the | |
1518 | * given node, creating the property if it does not already exist. | |
1519 | * | |
1520 | * This function may insert data into the blob, and will therefore | |
1521 | * change the offsets of some existing nodes. | |
1522 | * | |
1523 | * returns: | |
1524 | * 0, on success | |
1525 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1526 | * contain the new property value | |
1527 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1528 | * -FDT_ERR_BADLAYOUT, | |
1529 | * -FDT_ERR_BADMAGIC, | |
1530 | * -FDT_ERR_BADVERSION, | |
1531 | * -FDT_ERR_BADSTATE, | |
1532 | * -FDT_ERR_BADSTRUCTURE, | |
1533 | * -FDT_ERR_BADLAYOUT, | |
1534 | * -FDT_ERR_TRUNCATED, standard meanings | |
1535 | */ | |
1536 | int fdt_appendprop(void *fdt, int nodeoffset, const char *name, | |
1537 | const void *val, int len); | |
1538 | ||
1539 | /** | |
24fa0e58 | 1540 | * fdt_appendprop_u32 - append a 32-bit integer value to a property |
36ad18a6 ML |
1541 | * @fdt: pointer to the device tree blob |
1542 | * @nodeoffset: offset of the node whose property to change | |
1543 | * @name: name of the property to change | |
1544 | * @val: 32-bit integer value to append to the property (native endian) | |
1545 | * | |
24fa0e58 DG |
1546 | * fdt_appendprop_u32() appends the given 32-bit integer value |
1547 | * (converting to big-endian if necessary) to the value of the named | |
1548 | * property in the given node, or creates a new property with that | |
1549 | * value if it does not already exist. | |
36ad18a6 ML |
1550 | * |
1551 | * This function may insert data into the blob, and will therefore | |
1552 | * change the offsets of some existing nodes. | |
1553 | * | |
1554 | * returns: | |
1555 | * 0, on success | |
1556 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1557 | * contain the new property value | |
1558 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1559 | * -FDT_ERR_BADLAYOUT, | |
1560 | * -FDT_ERR_BADMAGIC, | |
1561 | * -FDT_ERR_BADVERSION, | |
1562 | * -FDT_ERR_BADSTATE, | |
1563 | * -FDT_ERR_BADSTRUCTURE, | |
1564 | * -FDT_ERR_BADLAYOUT, | |
1565 | * -FDT_ERR_TRUNCATED, standard meanings | |
1566 | */ | |
24fa0e58 DG |
1567 | static inline int fdt_appendprop_u32(void *fdt, int nodeoffset, |
1568 | const char *name, uint32_t val) | |
36ad18a6 | 1569 | { |
b2ba62a1 KP |
1570 | fdt32_t tmp = cpu_to_fdt32(val); |
1571 | return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
36ad18a6 ML |
1572 | } |
1573 | ||
24fa0e58 DG |
1574 | /** |
1575 | * fdt_appendprop_u64 - append a 64-bit integer value to a property | |
1576 | * @fdt: pointer to the device tree blob | |
1577 | * @nodeoffset: offset of the node whose property to change | |
1578 | * @name: name of the property to change | |
1579 | * @val: 64-bit integer value to append to the property (native endian) | |
1580 | * | |
1581 | * fdt_appendprop_u64() appends the given 64-bit integer value | |
1582 | * (converting to big-endian if necessary) to the value of the named | |
1583 | * property in the given node, or creates a new property with that | |
1584 | * value if it does not already exist. | |
1585 | * | |
1586 | * This function may insert data into the blob, and will therefore | |
1587 | * change the offsets of some existing nodes. | |
1588 | * | |
1589 | * returns: | |
1590 | * 0, on success | |
1591 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1592 | * contain the new property value | |
1593 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1594 | * -FDT_ERR_BADLAYOUT, | |
1595 | * -FDT_ERR_BADMAGIC, | |
1596 | * -FDT_ERR_BADVERSION, | |
1597 | * -FDT_ERR_BADSTATE, | |
1598 | * -FDT_ERR_BADSTRUCTURE, | |
1599 | * -FDT_ERR_BADLAYOUT, | |
1600 | * -FDT_ERR_TRUNCATED, standard meanings | |
1601 | */ | |
1602 | static inline int fdt_appendprop_u64(void *fdt, int nodeoffset, | |
1603 | const char *name, uint64_t val) | |
1604 | { | |
b2ba62a1 KP |
1605 | fdt64_t tmp = cpu_to_fdt64(val); |
1606 | return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1607 | } |
1608 | ||
1609 | /** | |
1610 | * fdt_appendprop_cell - append a single cell value to a property | |
1611 | * | |
1612 | * This is an alternative name for fdt_appendprop_u32() | |
1613 | */ | |
1614 | static inline int fdt_appendprop_cell(void *fdt, int nodeoffset, | |
1615 | const char *name, uint32_t val) | |
1616 | { | |
1617 | return fdt_appendprop_u32(fdt, nodeoffset, name, val); | |
1618 | } | |
1619 | ||
36ad18a6 ML |
1620 | /** |
1621 | * fdt_appendprop_string - append a string to a property | |
1622 | * @fdt: pointer to the device tree blob | |
1623 | * @nodeoffset: offset of the node whose property to change | |
1624 | * @name: name of the property to change | |
1625 | * @str: string value to append to the property | |
1626 | * | |
1627 | * fdt_appendprop_string() appends the given string to the value of | |
1628 | * the named property in the given node, or creates a new property | |
1629 | * with that value if it does not already exist. | |
1630 | * | |
1631 | * This function may insert data into the blob, and will therefore | |
1632 | * change the offsets of some existing nodes. | |
1633 | * | |
1634 | * returns: | |
1635 | * 0, on success | |
1636 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1637 | * contain the new property value | |
1638 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1639 | * -FDT_ERR_BADLAYOUT, | |
1640 | * -FDT_ERR_BADMAGIC, | |
1641 | * -FDT_ERR_BADVERSION, | |
1642 | * -FDT_ERR_BADSTATE, | |
1643 | * -FDT_ERR_BADSTRUCTURE, | |
1644 | * -FDT_ERR_BADLAYOUT, | |
1645 | * -FDT_ERR_TRUNCATED, standard meanings | |
1646 | */ | |
1647 | #define fdt_appendprop_string(fdt, nodeoffset, name, str) \ | |
1648 | fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) | |
1649 | ||
aec7135b DG |
1650 | /** |
1651 | * fdt_delprop - delete a property | |
1652 | * @fdt: pointer to the device tree blob | |
1653 | * @nodeoffset: offset of the node whose property to nop | |
1654 | * @name: name of the property to nop | |
1655 | * | |
1656 | * fdt_del_property() will delete the given property. | |
1657 | * | |
1658 | * This function will delete data from the blob, and will therefore | |
1659 | * change the offsets of some existing nodes. | |
1660 | * | |
1661 | * returns: | |
1662 | * 0, on success | |
1663 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1664 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1665 | * -FDT_ERR_BADLAYOUT, | |
1666 | * -FDT_ERR_BADMAGIC, | |
1667 | * -FDT_ERR_BADVERSION, | |
1668 | * -FDT_ERR_BADSTATE, | |
1669 | * -FDT_ERR_BADSTRUCTURE, | |
1670 | * -FDT_ERR_TRUNCATED, standard meanings | |
1671 | */ | |
7cd5da0f | 1672 | int fdt_delprop(void *fdt, int nodeoffset, const char *name); |
aec7135b DG |
1673 | |
1674 | /** | |
1675 | * fdt_add_subnode_namelen - creates a new node based on substring | |
1676 | * @fdt: pointer to the device tree blob | |
1677 | * @parentoffset: structure block offset of a node | |
1678 | * @name: name of the subnode to locate | |
1679 | * @namelen: number of characters of name to consider | |
1680 | * | |
1681 | * Identical to fdt_add_subnode(), but use only the first namelen | |
1682 | * characters of name as the name of the new node. This is useful for | |
1683 | * creating subnodes based on a portion of a larger string, such as a | |
1684 | * full path. | |
1685 | */ | |
7cd5da0f GVB |
1686 | int fdt_add_subnode_namelen(void *fdt, int parentoffset, |
1687 | const char *name, int namelen); | |
aec7135b DG |
1688 | |
1689 | /** | |
1690 | * fdt_add_subnode - creates a new node | |
1691 | * @fdt: pointer to the device tree blob | |
1692 | * @parentoffset: structure block offset of a node | |
1693 | * @name: name of the subnode to locate | |
1694 | * | |
1695 | * fdt_add_subnode() creates a new node as a subnode of the node at | |
1696 | * structure block offset parentoffset, with the given name (which | |
1697 | * should include the unit address, if any). | |
1698 | * | |
1699 | * This function will insert data into the blob, and will therefore | |
1700 | * change the offsets of some existing nodes. | |
1701 | ||
1702 | * returns: | |
1703 | * structure block offset of the created nodeequested subnode (>=0), on success | |
1704 | * -FDT_ERR_NOTFOUND, if the requested subnode does not exist | |
1705 | * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag | |
1706 | * -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of | |
1707 | * the given name | |
1708 | * -FDT_ERR_NOSPACE, if there is insufficient free space in the | |
1709 | * blob to contain the new node | |
1710 | * -FDT_ERR_NOSPACE | |
1711 | * -FDT_ERR_BADLAYOUT | |
1712 | * -FDT_ERR_BADMAGIC, | |
1713 | * -FDT_ERR_BADVERSION, | |
1714 | * -FDT_ERR_BADSTATE, | |
1715 | * -FDT_ERR_BADSTRUCTURE, | |
1716 | * -FDT_ERR_TRUNCATED, standard meanings. | |
1717 | */ | |
7cd5da0f | 1718 | int fdt_add_subnode(void *fdt, int parentoffset, const char *name); |
aec7135b DG |
1719 | |
1720 | /** | |
1721 | * fdt_del_node - delete a node (subtree) | |
1722 | * @fdt: pointer to the device tree blob | |
1723 | * @nodeoffset: offset of the node to nop | |
1724 | * | |
1725 | * fdt_del_node() will remove the given node, including all its | |
1726 | * subnodes if any, from the blob. | |
1727 | * | |
1728 | * This function will delete data from the blob, and will therefore | |
1729 | * change the offsets of some existing nodes. | |
1730 | * | |
1731 | * returns: | |
1732 | * 0, on success | |
1733 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1734 | * -FDT_ERR_BADLAYOUT, | |
1735 | * -FDT_ERR_BADMAGIC, | |
1736 | * -FDT_ERR_BADVERSION, | |
1737 | * -FDT_ERR_BADSTATE, | |
1738 | * -FDT_ERR_BADSTRUCTURE, | |
1739 | * -FDT_ERR_TRUNCATED, standard meanings | |
1740 | */ | |
7cd5da0f GVB |
1741 | int fdt_del_node(void *fdt, int nodeoffset); |
1742 | ||
ddf67f71 MR |
1743 | /** |
1744 | * fdt_overlay_apply - Applies a DT overlay on a base DT | |
1745 | * @fdt: pointer to the base device tree blob | |
1746 | * @fdto: pointer to the device tree overlay blob | |
1747 | * | |
1748 | * fdt_overlay_apply() will apply the given device tree overlay on the | |
1749 | * given base device tree. | |
1750 | * | |
1751 | * Expect the base device tree to be modified, even if the function | |
1752 | * returns an error. | |
1753 | * | |
1754 | * returns: | |
1755 | * 0, on success | |
1756 | * -FDT_ERR_NOSPACE, there's not enough space in the base device tree | |
1757 | * -FDT_ERR_NOTFOUND, the overlay points to some inexistant nodes or | |
1758 | * properties in the base DT | |
1759 | * -FDT_ERR_BADPHANDLE, the phandles in the overlay do not have the right | |
1760 | * magic | |
1761 | * -FDT_ERR_INTERNAL, | |
1762 | * -FDT_ERR_BADLAYOUT, | |
1763 | * -FDT_ERR_BADMAGIC, | |
1764 | * -FDT_ERR_BADOFFSET, | |
1765 | * -FDT_ERR_BADPATH, | |
1766 | * -FDT_ERR_BADVERSION, | |
1767 | * -FDT_ERR_BADSTRUCTURE, | |
1768 | * -FDT_ERR_BADSTATE, | |
1769 | * -FDT_ERR_TRUNCATED, standard meanings | |
1770 | */ | |
1771 | int fdt_overlay_apply(void *fdt, void *fdto); | |
1772 | ||
8d04f02f KG |
1773 | /**********************************************************************/ |
1774 | /* Debugging / informational functions */ | |
1775 | /**********************************************************************/ | |
1776 | ||
7cd5da0f GVB |
1777 | const char *fdt_strerror(int errval); |
1778 | ||
8f6e2e1e SG |
1779 | /** |
1780 | * fdt_remove_unused_strings() - Remove any unused strings from an FDT | |
1781 | * | |
1782 | * This creates a new device tree in @new with unused strings removed. The | |
1783 | * called can then use fdt_pack() to minimise the space consumed. | |
1784 | * | |
1785 | * @old: Old device tree blog | |
1786 | * @new: Place to put new device tree blob, which must be as large as | |
1787 | * @old | |
1788 | * @return | |
1789 | * 0, on success | |
1790 | * -FDT_ERR_BADOFFSET, corrupt device tree | |
1791 | * -FDT_ERR_NOSPACE, out of space, which should not happen unless there | |
1792 | * is something very wrong with the device tree input | |
1793 | */ | |
1794 | int fdt_remove_unused_strings(const void *old, void *new); | |
1795 | ||
3e06cd1f SG |
1796 | struct fdt_region { |
1797 | int offset; | |
1798 | int size; | |
1799 | }; | |
1800 | ||
c3c4c005 SG |
1801 | /* |
1802 | * Flags for fdt_find_regions() | |
1803 | * | |
1804 | * Add a region for the string table (always the last region) | |
1805 | */ | |
1806 | #define FDT_REG_ADD_STRING_TAB (1 << 0) | |
1807 | ||
1808 | /* | |
1809 | * Add all supernodes of a matching node/property, useful for creating a | |
1810 | * valid subset tree | |
1811 | */ | |
1812 | #define FDT_REG_SUPERNODES (1 << 1) | |
1813 | ||
1814 | /* Add the FDT_BEGIN_NODE tags of subnodes, including their names */ | |
1815 | #define FDT_REG_DIRECT_SUBNODES (1 << 2) | |
1816 | ||
1817 | /* Add all subnodes of a matching node */ | |
1818 | #define FDT_REG_ALL_SUBNODES (1 << 3) | |
1819 | ||
1820 | /* Add a region for the mem_rsvmap table (always the first region) */ | |
1821 | #define FDT_REG_ADD_MEM_RSVMAP (1 << 4) | |
1822 | ||
1823 | /* Indicates what an fdt part is (node, property, value) */ | |
1824 | #define FDT_IS_NODE (1 << 0) | |
1825 | #define FDT_IS_PROP (1 << 1) | |
1826 | #define FDT_IS_VALUE (1 << 2) /* not supported */ | |
1827 | #define FDT_IS_COMPAT (1 << 3) /* used internally */ | |
1828 | #define FDT_NODE_HAS_PROP (1 << 4) /* node contains prop */ | |
1829 | ||
1830 | #define FDT_ANY_GLOBAL (FDT_IS_NODE | FDT_IS_PROP | FDT_IS_VALUE | \ | |
1831 | FDT_IS_COMPAT) | |
1832 | #define FDT_IS_ANY 0x1f /* all the above */ | |
1833 | ||
1834 | /* We set a reasonable limit on the number of nested nodes */ | |
1835 | #define FDT_MAX_DEPTH 32 | |
1836 | ||
1837 | /* Decribes what we want to include from the current tag */ | |
1838 | enum want_t { | |
1839 | WANT_NOTHING, | |
1840 | WANT_NODES_ONLY, /* No properties */ | |
1841 | WANT_NODES_AND_PROPS, /* Everything for one level */ | |
1842 | WANT_ALL_NODES_AND_PROPS /* Everything for all levels */ | |
1843 | }; | |
1844 | ||
1845 | /* Keeps track of the state at parent nodes */ | |
1846 | struct fdt_subnode_stack { | |
1847 | int offset; /* Offset of node */ | |
1848 | enum want_t want; /* The 'want' value here */ | |
1849 | int included; /* 1 if we included this node, 0 if not */ | |
1850 | }; | |
1851 | ||
1852 | struct fdt_region_ptrs { | |
1853 | int depth; /* Current tree depth */ | |
1854 | int done; /* What we have completed scanning */ | |
1855 | enum want_t want; /* What we are currently including */ | |
1856 | char *end; /* Pointer to end of full node path */ | |
1857 | int nextoffset; /* Next node offset to check */ | |
1858 | }; | |
1859 | ||
1860 | /* The state of our finding algortihm */ | |
1861 | struct fdt_region_state { | |
1862 | struct fdt_subnode_stack stack[FDT_MAX_DEPTH]; /* node stack */ | |
1863 | struct fdt_region *region; /* Contains list of regions found */ | |
1864 | int count; /* Numnber of regions found */ | |
1865 | const void *fdt; /* FDT blob */ | |
1866 | int max_regions; /* Maximum regions to find */ | |
1867 | int can_merge; /* 1 if we can merge with previous region */ | |
1868 | int start; /* Start position of current region */ | |
1869 | struct fdt_region_ptrs ptrs; /* Pointers for what we are up to */ | |
1870 | }; | |
1871 | ||
3e06cd1f SG |
1872 | /** |
1873 | * fdt_find_regions() - find regions in device tree | |
1874 | * | |
1875 | * Given a list of nodes to include and properties to exclude, find | |
1876 | * the regions of the device tree which describe those included parts. | |
1877 | * | |
1878 | * The intent is to get a list of regions which will be invariant provided | |
1879 | * those parts are invariant. For example, if you request a list of regions | |
1880 | * for all nodes but exclude the property "data", then you will get the | |
1881 | * same region contents regardless of any change to "data" properties. | |
1882 | * | |
1883 | * This function can be used to produce a byte-stream to send to a hashing | |
1884 | * function to verify that critical parts of the FDT have not changed. | |
1885 | * | |
1886 | * Nodes which are given in 'inc' are included in the region list, as | |
1887 | * are the names of the immediate subnodes nodes (but not the properties | |
1888 | * or subnodes of those subnodes). | |
1889 | * | |
1890 | * For eaxample "/" means to include the root node, all root properties | |
1891 | * and the FDT_BEGIN_NODE and FDT_END_NODE of all subnodes of /. The latter | |
1892 | * ensures that we capture the names of the subnodes. In a hashing situation | |
1893 | * it prevents the root node from changing at all Any change to non-excluded | |
1894 | * properties, names of subnodes or number of subnodes would be detected. | |
1895 | * | |
1896 | * When used with FITs this provides the ability to hash and sign parts of | |
1897 | * the FIT based on different configurations in the FIT. Then it is | |
1898 | * impossible to change anything about that configuration (include images | |
1899 | * attached to the configuration), but it may be possible to add new | |
1900 | * configurations, new images or new signatures within the existing | |
1901 | * framework. | |
1902 | * | |
1903 | * Adding new properties to a device tree may result in the string table | |
1904 | * being extended (if the new property names are different from those | |
1905 | * already added). This function can optionally include a region for | |
1906 | * the string table so that this can be part of the hash too. | |
1907 | * | |
1908 | * The device tree header is not included in the list. | |
1909 | * | |
1910 | * @fdt: Device tree to check | |
1911 | * @inc: List of node paths to included | |
1912 | * @inc_count: Number of node paths in list | |
1913 | * @exc_prop: List of properties names to exclude | |
1914 | * @exc_prop_count: Number of properties in exclude list | |
1915 | * @region: Returns list of regions | |
1916 | * @max_region: Maximum length of region list | |
1917 | * @path: Pointer to a temporary string for the function to use for | |
1918 | * building path names | |
1919 | * @path_len: Length of path, must be large enough to hold the longest | |
1920 | * path in the tree | |
1921 | * @add_string_tab: 1 to add a region for the string table | |
1922 | * @return number of regions in list. If this is >max_regions then the | |
1923 | * region array was exhausted. You should increase max_regions and try | |
1924 | * the call again. | |
1925 | */ | |
1926 | int fdt_find_regions(const void *fdt, char * const inc[], int inc_count, | |
1927 | char * const exc_prop[], int exc_prop_count, | |
1928 | struct fdt_region region[], int max_regions, | |
1929 | char *path, int path_len, int add_string_tab); | |
1930 | ||
c3c4c005 SG |
1931 | /** |
1932 | * fdt_first_region() - find regions in device tree | |
1933 | * | |
1934 | * Given a nodes and properties to include and properties to exclude, find | |
1935 | * the regions of the device tree which describe those included parts. | |
1936 | * | |
1937 | * The use for this function is twofold. Firstly it provides a convenient | |
1938 | * way of performing a structure-aware grep of the tree. For example it is | |
1939 | * possible to grep for a node and get all the properties associated with | |
1940 | * that node. Trees can be subsetted easily, by specifying the nodes that | |
1941 | * are required, and then writing out the regions returned by this function. | |
1942 | * This is useful for small resource-constrained systems, such as boot | |
1943 | * loaders, which want to use an FDT but do not need to know about all of | |
1944 | * it. | |
1945 | * | |
1946 | * Secondly it makes it easy to hash parts of the tree and detect changes. | |
1947 | * The intent is to get a list of regions which will be invariant provided | |
1948 | * those parts are invariant. For example, if you request a list of regions | |
1949 | * for all nodes but exclude the property "data", then you will get the | |
1950 | * same region contents regardless of any change to "data" properties. | |
1951 | * | |
1952 | * This function can be used to produce a byte-stream to send to a hashing | |
1953 | * function to verify that critical parts of the FDT have not changed. | |
1954 | * Note that semantically null changes in order could still cause false | |
1955 | * hash misses. Such reordering might happen if the tree is regenerated | |
1956 | * from source, and nodes are reordered (the bytes-stream will be emitted | |
1957 | * in a different order and mnay hash functions will detect this). However | |
1958 | * if an existing tree is modified using libfdt functions, such as | |
1959 | * fdt_add_subnode() and fdt_setprop(), then this problem is avoided. | |
1960 | * | |
1961 | * The nodes/properties to include/exclude are defined by a function | |
1962 | * provided by the caller. This function is called for each node and | |
1963 | * property, and must return: | |
1964 | * | |
1965 | * 0 - to exclude this part | |
1966 | * 1 - to include this part | |
1967 | * -1 - for FDT_IS_PROP only: no information is available, so include | |
1968 | * if its containing node is included | |
1969 | * | |
1970 | * The last case is only used to deal with properties. Often a property is | |
1971 | * included if its containing node is included - this is the case where | |
1972 | * -1 is returned.. However if the property is specifically required to be | |
1973 | * included/excluded, then 0 or 1 can be returned. Note that including a | |
1974 | * property when the FDT_REG_SUPERNODES flag is given will force its | |
1975 | * containing node to be included since it is not valid to have a property | |
1976 | * that is not in a node. | |
1977 | * | |
1978 | * Using the information provided, the inclusion of a node can be controlled | |
1979 | * either by a node name or its compatible string, or any other property | |
1980 | * that the function can determine. | |
1981 | * | |
1982 | * As an example, including node "/" means to include the root node and all | |
1983 | * root properties. A flag provides a way of also including supernodes (of | |
1984 | * which there is none for the root node), and another flag includes | |
1985 | * immediate subnodes, so in this case we would get the FDT_BEGIN_NODE and | |
1986 | * FDT_END_NODE of all subnodes of /. | |
1987 | * | |
1988 | * The subnode feature helps in a hashing situation since it prevents the | |
1989 | * root node from changing at all. Any change to non-excluded properties, | |
1990 | * names of subnodes or number of subnodes would be detected. | |
1991 | * | |
1992 | * When used with FITs this provides the ability to hash and sign parts of | |
1993 | * the FIT based on different configurations in the FIT. Then it is | |
1994 | * impossible to change anything about that configuration (include images | |
1995 | * attached to the configuration), but it may be possible to add new | |
1996 | * configurations, new images or new signatures within the existing | |
1997 | * framework. | |
1998 | * | |
1999 | * Adding new properties to a device tree may result in the string table | |
2000 | * being extended (if the new property names are different from those | |
2001 | * already added). This function can optionally include a region for | |
2002 | * the string table so that this can be part of the hash too. This is always | |
2003 | * the last region. | |
2004 | * | |
2005 | * The FDT also has a mem_rsvmap table which can also be included, and is | |
2006 | * always the first region if so. | |
2007 | * | |
2008 | * The device tree header is not included in the region list. Since the | |
2009 | * contents of the FDT are changing (shrinking, often), the caller will need | |
2010 | * to regenerate the header anyway. | |
2011 | * | |
2012 | * @fdt: Device tree to check | |
2013 | * @h_include: Function to call to determine whether to include a part or | |
2014 | * not: | |
2015 | * | |
2016 | * @priv: Private pointer as passed to fdt_find_regions() | |
2017 | * @fdt: Pointer to FDT blob | |
2018 | * @offset: Offset of this node / property | |
2019 | * @type: Type of this part, FDT_IS_... | |
2020 | * @data: Pointer to data (node name, property name, compatible | |
2021 | * string, value (not yet supported) | |
2022 | * @size: Size of data, or 0 if none | |
2023 | * @return 0 to exclude, 1 to include, -1 if no information is | |
2024 | * available | |
2025 | * @priv: Private pointer passed to h_include | |
2026 | * @region: Returns list of regions, sorted by offset | |
2027 | * @max_regions: Maximum length of region list | |
2028 | * @path: Pointer to a temporary string for the function to use for | |
2029 | * building path names | |
2030 | * @path_len: Length of path, must be large enough to hold the longest | |
2031 | * path in the tree | |
2032 | * @flags: Various flags that control the region algortihm, see | |
2033 | * FDT_REG_... | |
2034 | * @return number of regions in list. If this is >max_regions then the | |
2035 | * region array was exhausted. You should increase max_regions and try | |
2036 | * the call again. Only the first max_regions elements are available in the | |
2037 | * array. | |
2038 | * | |
2039 | * On error a -ve value is return, which can be: | |
2040 | * | |
2041 | * -FDT_ERR_BADSTRUCTURE (too deep or more END tags than BEGIN tags | |
2042 | * -FDT_ERR_BADLAYOUT | |
2043 | * -FDT_ERR_NOSPACE (path area is too small) | |
2044 | */ | |
2045 | int fdt_first_region(const void *fdt, | |
2046 | int (*h_include)(void *priv, const void *fdt, int offset, | |
2047 | int type, const char *data, int size), | |
2048 | void *priv, struct fdt_region *region, | |
2049 | char *path, int path_len, int flags, | |
2050 | struct fdt_region_state *info); | |
2051 | ||
2052 | /** fdt_next_region() - find next region | |
2053 | * | |
2054 | * See fdt_first_region() for full description. This function finds the | |
2055 | * next region according to the provided parameters, which must be the same | |
2056 | * as passed to fdt_first_region(). | |
2057 | * | |
2058 | * This function can additionally return -FDT_ERR_NOTFOUND when there are no | |
2059 | * more regions | |
2060 | */ | |
2061 | int fdt_next_region(const void *fdt, | |
2062 | int (*h_include)(void *priv, const void *fdt, int offset, | |
2063 | int type, const char *data, int size), | |
2064 | void *priv, struct fdt_region *region, | |
2065 | char *path, int path_len, int flags, | |
2066 | struct fdt_region_state *info); | |
2067 | ||
2068 | /** | |
2069 | * fdt_add_alias_regions() - find aliases that point to existing regions | |
2070 | * | |
2071 | * Once a device tree grep is complete some of the nodes will be present | |
2072 | * and some will have been dropped. This function checks all the alias nodes | |
2073 | * to figure out which points point to nodes which are still present. These | |
2074 | * aliases need to be kept, along with the nodes they reference. | |
2075 | * | |
2076 | * Given a list of regions function finds the aliases that still apply and | |
2077 | * adds more regions to the list for these. This function is called after | |
2078 | * fdt_next_region() has finished returning regions and requires the same | |
2079 | * state. | |
2080 | * | |
2081 | * @fdt: Device tree file to reference | |
2082 | * @region: List of regions that will be kept | |
2083 | * @count: Number of regions | |
2084 | * @max_regions: Number of entries that can fit in @region | |
2085 | * @info: Region state as returned from fdt_next_region() | |
2086 | * @return new number of regions in @region (i.e. count + the number added) | |
2087 | * or -FDT_ERR_NOSPACE if there was not enough space. | |
2088 | */ | |
2089 | int fdt_add_alias_regions(const void *fdt, struct fdt_region *region, int count, | |
2090 | int max_regions, struct fdt_region_state *info); | |
2091 | ||
7cd5da0f | 2092 | #endif /* _LIBFDT_H */ |