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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 | ||
124 | #define FDT_ERR_MAX 14 | |
8d04f02f KG |
125 | |
126 | /**********************************************************************/ | |
127 | /* Low-level functions (you probably don't need these) */ | |
128 | /**********************************************************************/ | |
129 | ||
741a6d01 | 130 | const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen); |
8d04f02f KG |
131 | static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen) |
132 | { | |
c6683026 | 133 | return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen); |
8d04f02f KG |
134 | } |
135 | ||
136 | uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset); | |
137 | ||
ae0b5908 DG |
138 | /**********************************************************************/ |
139 | /* Traversal functions */ | |
140 | /**********************************************************************/ | |
141 | ||
142 | int fdt_next_node(const void *fdt, int offset, int *depth); | |
143 | ||
88f95bba SG |
144 | /** |
145 | * fdt_first_subnode() - get offset of first direct subnode | |
146 | * | |
147 | * @fdt: FDT blob | |
148 | * @offset: Offset of node to check | |
149 | * @return offset of first subnode, or -FDT_ERR_NOTFOUND if there is none | |
150 | */ | |
151 | int fdt_first_subnode(const void *fdt, int offset); | |
152 | ||
153 | /** | |
154 | * fdt_next_subnode() - get offset of next direct subnode | |
155 | * | |
156 | * After first calling fdt_first_subnode(), call this function repeatedly to | |
157 | * get direct subnodes of a parent node. | |
158 | * | |
159 | * @fdt: FDT blob | |
160 | * @offset: Offset of previous subnode | |
161 | * @return offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more | |
162 | * subnodes | |
163 | */ | |
164 | int fdt_next_subnode(const void *fdt, int offset); | |
165 | ||
8d04f02f KG |
166 | /**********************************************************************/ |
167 | /* General functions */ | |
168 | /**********************************************************************/ | |
7cd5da0f GVB |
169 | |
170 | #define fdt_get_header(fdt, field) \ | |
8d04f02f | 171 | (fdt32_to_cpu(((const struct fdt_header *)(fdt))->field)) |
53677ef1 | 172 | #define fdt_magic(fdt) (fdt_get_header(fdt, magic)) |
7cd5da0f GVB |
173 | #define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize)) |
174 | #define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct)) | |
175 | #define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings)) | |
176 | #define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap)) | |
177 | #define fdt_version(fdt) (fdt_get_header(fdt, version)) | |
53677ef1 WD |
178 | #define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version)) |
179 | #define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys)) | |
180 | #define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings)) | |
7cd5da0f GVB |
181 | #define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct)) |
182 | ||
8d04f02f KG |
183 | #define __fdt_set_hdr(name) \ |
184 | static inline void fdt_set_##name(void *fdt, uint32_t val) \ | |
185 | { \ | |
67b89c79 | 186 | struct fdt_header *fdth = (struct fdt_header*)fdt; \ |
8d04f02f KG |
187 | fdth->name = cpu_to_fdt32(val); \ |
188 | } | |
189 | __fdt_set_hdr(magic); | |
190 | __fdt_set_hdr(totalsize); | |
191 | __fdt_set_hdr(off_dt_struct); | |
192 | __fdt_set_hdr(off_dt_strings); | |
193 | __fdt_set_hdr(off_mem_rsvmap); | |
194 | __fdt_set_hdr(version); | |
195 | __fdt_set_hdr(last_comp_version); | |
196 | __fdt_set_hdr(boot_cpuid_phys); | |
197 | __fdt_set_hdr(size_dt_strings); | |
198 | __fdt_set_hdr(size_dt_struct); | |
199 | #undef __fdt_set_hdr | |
7cd5da0f | 200 | |
8d04f02f KG |
201 | /** |
202 | * fdt_check_header - sanity check a device tree or possible device tree | |
203 | * @fdt: pointer to data which might be a flattened device tree | |
204 | * | |
205 | * fdt_check_header() checks that the given buffer contains what | |
206 | * appears to be a flattened device tree with sane information in its | |
207 | * header. | |
208 | * | |
209 | * returns: | |
210 | * 0, if the buffer appears to contain a valid device tree | |
211 | * -FDT_ERR_BADMAGIC, | |
212 | * -FDT_ERR_BADVERSION, | |
213 | * -FDT_ERR_BADSTATE, standard meanings, as above | |
214 | */ | |
6679f929 GVB |
215 | int fdt_check_header(const void *fdt); |
216 | ||
8d04f02f KG |
217 | /** |
218 | * fdt_move - move a device tree around in memory | |
219 | * @fdt: pointer to the device tree to move | |
220 | * @buf: pointer to memory where the device is to be moved | |
221 | * @bufsize: size of the memory space at buf | |
222 | * | |
223 | * fdt_move() relocates, if possible, the device tree blob located at | |
224 | * fdt to the buffer at buf of size bufsize. The buffer may overlap | |
225 | * with the existing device tree blob at fdt. Therefore, | |
226 | * fdt_move(fdt, fdt, fdt_totalsize(fdt)) | |
227 | * should always succeed. | |
228 | * | |
229 | * returns: | |
230 | * 0, on success | |
231 | * -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree | |
232 | * -FDT_ERR_BADMAGIC, | |
233 | * -FDT_ERR_BADVERSION, | |
234 | * -FDT_ERR_BADSTATE, standard meanings | |
235 | */ | |
236 | int fdt_move(const void *fdt, void *buf, int bufsize); | |
7cd5da0f | 237 | |
8d04f02f KG |
238 | /**********************************************************************/ |
239 | /* Read-only functions */ | |
240 | /**********************************************************************/ | |
7cd5da0f | 241 | |
8d04f02f | 242 | /** |
46390da1 | 243 | * fdt_string - retrieve a string from the strings block of a device tree |
8d04f02f KG |
244 | * @fdt: pointer to the device tree blob |
245 | * @stroffset: offset of the string within the strings block (native endian) | |
246 | * | |
247 | * fdt_string() retrieves a pointer to a single string from the | |
248 | * strings block of the device tree blob at fdt. | |
249 | * | |
250 | * returns: | |
251 | * a pointer to the string, on success | |
252 | * NULL, if stroffset is out of bounds | |
253 | */ | |
254 | const char *fdt_string(const void *fdt, int stroffset); | |
7cd5da0f | 255 | |
8d04f02f | 256 | /** |
46390da1 | 257 | * fdt_num_mem_rsv - retrieve the number of memory reserve map entries |
8d04f02f KG |
258 | * @fdt: pointer to the device tree blob |
259 | * | |
260 | * Returns the number of entries in the device tree blob's memory | |
261 | * reservation map. This does not include the terminating 0,0 entry | |
262 | * or any other (0,0) entries reserved for expansion. | |
263 | * | |
264 | * returns: | |
265 | * the number of entries | |
266 | */ | |
267 | int fdt_num_mem_rsv(const void *fdt); | |
7cd5da0f | 268 | |
8d04f02f | 269 | /** |
46390da1 | 270 | * fdt_get_mem_rsv - retrieve one memory reserve map entry |
8d04f02f KG |
271 | * @fdt: pointer to the device tree blob |
272 | * @address, @size: pointers to 64-bit variables | |
273 | * | |
274 | * On success, *address and *size will contain the address and size of | |
275 | * the n-th reserve map entry from the device tree blob, in | |
276 | * native-endian format. | |
277 | * | |
278 | * returns: | |
279 | * 0, on success | |
280 | * -FDT_ERR_BADMAGIC, | |
281 | * -FDT_ERR_BADVERSION, | |
282 | * -FDT_ERR_BADSTATE, standard meanings | |
283 | */ | |
284 | int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size); | |
285 | ||
286 | /** | |
287 | * fdt_subnode_offset_namelen - find a subnode based on substring | |
288 | * @fdt: pointer to the device tree blob | |
289 | * @parentoffset: structure block offset of a node | |
290 | * @name: name of the subnode to locate | |
291 | * @namelen: number of characters of name to consider | |
292 | * | |
293 | * Identical to fdt_subnode_offset(), but only examine the first | |
294 | * namelen characters of name for matching the subnode name. This is | |
295 | * useful for finding subnodes based on a portion of a larger string, | |
296 | * such as a full path. | |
297 | */ | |
7cd5da0f GVB |
298 | int fdt_subnode_offset_namelen(const void *fdt, int parentoffset, |
299 | const char *name, int namelen); | |
8d04f02f KG |
300 | /** |
301 | * fdt_subnode_offset - find a subnode of a given node | |
302 | * @fdt: pointer to the device tree blob | |
303 | * @parentoffset: structure block offset of a node | |
304 | * @name: name of the subnode to locate | |
305 | * | |
306 | * fdt_subnode_offset() finds a subnode of the node at structure block | |
307 | * offset parentoffset with the given name. name may include a unit | |
308 | * address, in which case fdt_subnode_offset() will find the subnode | |
309 | * with that unit address, or the unit address may be omitted, in | |
310 | * which case fdt_subnode_offset() will find an arbitrary subnode | |
311 | * whose name excluding unit address matches the given name. | |
312 | * | |
313 | * returns: | |
314 | * structure block offset of the requested subnode (>=0), on success | |
315 | * -FDT_ERR_NOTFOUND, if the requested subnode does not exist | |
316 | * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag | |
317 | * -FDT_ERR_BADMAGIC, | |
318 | * -FDT_ERR_BADVERSION, | |
319 | * -FDT_ERR_BADSTATE, | |
320 | * -FDT_ERR_BADSTRUCTURE, | |
321 | * -FDT_ERR_TRUNCATED, standard meanings. | |
322 | */ | |
7cd5da0f GVB |
323 | int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name); |
324 | ||
8d04f02f KG |
325 | /** |
326 | * fdt_path_offset - find a tree node by its full path | |
327 | * @fdt: pointer to the device tree blob | |
328 | * @path: full path of the node to locate | |
329 | * | |
330 | * fdt_path_offset() finds a node of a given path in the device tree. | |
331 | * Each path component may omit the unit address portion, but the | |
332 | * results of this are undefined if any such path component is | |
333 | * ambiguous (that is if there are multiple nodes at the relevant | |
334 | * level matching the given component, differentiated only by unit | |
335 | * address). | |
336 | * | |
337 | * returns: | |
338 | * structure block offset of the node with the requested path (>=0), on success | |
339 | * -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid | |
340 | * -FDT_ERR_NOTFOUND, if the requested node does not exist | |
341 | * -FDT_ERR_BADMAGIC, | |
342 | * -FDT_ERR_BADVERSION, | |
343 | * -FDT_ERR_BADSTATE, | |
344 | * -FDT_ERR_BADSTRUCTURE, | |
345 | * -FDT_ERR_TRUNCATED, standard meanings. | |
346 | */ | |
347 | int fdt_path_offset(const void *fdt, const char *path); | |
348 | ||
349 | /** | |
46390da1 | 350 | * fdt_get_name - retrieve the name of a given node |
8d04f02f KG |
351 | * @fdt: pointer to the device tree blob |
352 | * @nodeoffset: structure block offset of the starting node | |
353 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
354 | * | |
355 | * fdt_get_name() retrieves the name (including unit address) of the | |
356 | * device tree node at structure block offset nodeoffset. If lenp is | |
357 | * non-NULL, the length of this name is also returned, in the integer | |
358 | * pointed to by lenp. | |
359 | * | |
360 | * returns: | |
361 | * pointer to the node's name, on success | |
362 | * If lenp is non-NULL, *lenp contains the length of that name (>=0) | |
363 | * NULL, on error | |
364 | * if lenp is non-NULL *lenp contains an error code (<0): | |
365 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
366 | * -FDT_ERR_BADMAGIC, | |
367 | * -FDT_ERR_BADVERSION, | |
368 | * -FDT_ERR_BADSTATE, standard meanings | |
369 | */ | |
370 | const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp); | |
371 | ||
d1c63148 DG |
372 | /** |
373 | * fdt_first_property_offset - find the offset of a node's first property | |
374 | * @fdt: pointer to the device tree blob | |
375 | * @nodeoffset: structure block offset of a node | |
376 | * | |
377 | * fdt_first_property_offset() finds the first property of the node at | |
378 | * the given structure block offset. | |
379 | * | |
380 | * returns: | |
381 | * structure block offset of the property (>=0), on success | |
382 | * -FDT_ERR_NOTFOUND, if the requested node has no properties | |
383 | * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag | |
384 | * -FDT_ERR_BADMAGIC, | |
385 | * -FDT_ERR_BADVERSION, | |
386 | * -FDT_ERR_BADSTATE, | |
387 | * -FDT_ERR_BADSTRUCTURE, | |
388 | * -FDT_ERR_TRUNCATED, standard meanings. | |
389 | */ | |
390 | int fdt_first_property_offset(const void *fdt, int nodeoffset); | |
391 | ||
392 | /** | |
393 | * fdt_next_property_offset - step through a node's properties | |
394 | * @fdt: pointer to the device tree blob | |
395 | * @offset: structure block offset of a property | |
396 | * | |
397 | * fdt_next_property_offset() finds the property immediately after the | |
398 | * one at the given structure block offset. This will be a property | |
399 | * of the same node as the given property. | |
400 | * | |
401 | * returns: | |
402 | * structure block offset of the next property (>=0), on success | |
403 | * -FDT_ERR_NOTFOUND, if the given property is the last in its node | |
404 | * -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag | |
405 | * -FDT_ERR_BADMAGIC, | |
406 | * -FDT_ERR_BADVERSION, | |
407 | * -FDT_ERR_BADSTATE, | |
408 | * -FDT_ERR_BADSTRUCTURE, | |
409 | * -FDT_ERR_TRUNCATED, standard meanings. | |
410 | */ | |
411 | int fdt_next_property_offset(const void *fdt, int offset); | |
412 | ||
413 | /** | |
414 | * fdt_get_property_by_offset - retrieve the property at a given offset | |
415 | * @fdt: pointer to the device tree blob | |
416 | * @offset: offset of the property to retrieve | |
417 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
418 | * | |
419 | * fdt_get_property_by_offset() retrieves a pointer to the | |
420 | * fdt_property structure within the device tree blob at the given | |
421 | * offset. If lenp is non-NULL, the length of the property value is | |
422 | * also returned, in the integer pointed to by lenp. | |
423 | * | |
424 | * returns: | |
425 | * pointer to the structure representing the property | |
426 | * if lenp is non-NULL, *lenp contains the length of the property | |
427 | * value (>=0) | |
428 | * NULL, on error | |
429 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
430 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag | |
431 | * -FDT_ERR_BADMAGIC, | |
432 | * -FDT_ERR_BADVERSION, | |
433 | * -FDT_ERR_BADSTATE, | |
434 | * -FDT_ERR_BADSTRUCTURE, | |
435 | * -FDT_ERR_TRUNCATED, standard meanings | |
436 | */ | |
437 | const struct fdt_property *fdt_get_property_by_offset(const void *fdt, | |
438 | int offset, | |
439 | int *lenp); | |
440 | ||
0219399a DG |
441 | /** |
442 | * fdt_get_property_namelen - find a property based on substring | |
443 | * @fdt: pointer to the device tree blob | |
444 | * @nodeoffset: offset of the node whose property to find | |
445 | * @name: name of the property to find | |
446 | * @namelen: number of characters of name to consider | |
447 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
448 | * | |
449 | * Identical to fdt_get_property_namelen(), but only examine the first | |
450 | * namelen characters of name for matching the property name. | |
451 | */ | |
452 | const struct fdt_property *fdt_get_property_namelen(const void *fdt, | |
453 | int nodeoffset, | |
454 | const char *name, | |
455 | int namelen, int *lenp); | |
456 | ||
8d04f02f KG |
457 | /** |
458 | * fdt_get_property - find a given property in a given node | |
459 | * @fdt: pointer to the device tree blob | |
460 | * @nodeoffset: offset of the node whose property to find | |
461 | * @name: name of the property to find | |
462 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
463 | * | |
464 | * fdt_get_property() retrieves a pointer to the fdt_property | |
465 | * structure within the device tree blob corresponding to the property | |
466 | * named 'name' of the node at offset nodeoffset. If lenp is | |
46390da1 | 467 | * non-NULL, the length of the property value is also returned, in the |
8d04f02f KG |
468 | * integer pointed to by lenp. |
469 | * | |
470 | * returns: | |
471 | * pointer to the structure representing the property | |
472 | * if lenp is non-NULL, *lenp contains the length of the property | |
473 | * value (>=0) | |
474 | * NULL, on error | |
475 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
476 | * -FDT_ERR_NOTFOUND, node does not have named property | |
477 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
478 | * -FDT_ERR_BADMAGIC, | |
479 | * -FDT_ERR_BADVERSION, | |
480 | * -FDT_ERR_BADSTATE, | |
481 | * -FDT_ERR_BADSTRUCTURE, | |
482 | * -FDT_ERR_TRUNCATED, standard meanings | |
483 | */ | |
484 | const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset, | |
485 | const char *name, int *lenp); | |
486 | static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset, | |
487 | const char *name, | |
488 | int *lenp) | |
489 | { | |
c6683026 DG |
490 | return (struct fdt_property *)(uintptr_t) |
491 | fdt_get_property(fdt, nodeoffset, name, lenp); | |
8d04f02f KG |
492 | } |
493 | ||
d1c63148 DG |
494 | /** |
495 | * fdt_getprop_by_offset - retrieve the value of a property at a given offset | |
496 | * @fdt: pointer to the device tree blob | |
497 | * @ffset: offset of the property to read | |
498 | * @namep: pointer to a string variable (will be overwritten) or NULL | |
499 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
500 | * | |
501 | * fdt_getprop_by_offset() retrieves a pointer to the value of the | |
502 | * property at structure block offset 'offset' (this will be a pointer | |
503 | * to within the device blob itself, not a copy of the value). If | |
504 | * lenp is non-NULL, the length of the property value is also | |
505 | * returned, in the integer pointed to by lenp. If namep is non-NULL, | |
506 | * the property's namne will also be returned in the char * pointed to | |
507 | * by namep (this will be a pointer to within the device tree's string | |
508 | * block, not a new copy of the name). | |
509 | * | |
510 | * returns: | |
511 | * pointer to the property's value | |
512 | * if lenp is non-NULL, *lenp contains the length of the property | |
513 | * value (>=0) | |
514 | * if namep is non-NULL *namep contiains a pointer to the property | |
515 | * name. | |
516 | * NULL, on error | |
517 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
518 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag | |
519 | * -FDT_ERR_BADMAGIC, | |
520 | * -FDT_ERR_BADVERSION, | |
521 | * -FDT_ERR_BADSTATE, | |
522 | * -FDT_ERR_BADSTRUCTURE, | |
523 | * -FDT_ERR_TRUNCATED, standard meanings | |
524 | */ | |
525 | const void *fdt_getprop_by_offset(const void *fdt, int offset, | |
526 | const char **namep, int *lenp); | |
527 | ||
0219399a DG |
528 | /** |
529 | * fdt_getprop_namelen - get property value based on substring | |
530 | * @fdt: pointer to the device tree blob | |
531 | * @nodeoffset: offset of the node whose property to find | |
532 | * @name: name of the property to find | |
533 | * @namelen: number of characters of name to consider | |
534 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
535 | * | |
536 | * Identical to fdt_getprop(), but only examine the first namelen | |
537 | * characters of name for matching the property name. | |
538 | */ | |
539 | const void *fdt_getprop_namelen(const void *fdt, int nodeoffset, | |
540 | const char *name, int namelen, int *lenp); | |
541 | ||
8d04f02f KG |
542 | /** |
543 | * fdt_getprop - retrieve the value of a given property | |
544 | * @fdt: pointer to the device tree blob | |
545 | * @nodeoffset: offset of the node whose property to find | |
546 | * @name: name of the property to find | |
547 | * @lenp: pointer to an integer variable (will be overwritten) or NULL | |
548 | * | |
549 | * fdt_getprop() retrieves a pointer to the value of the property | |
550 | * named 'name' of the node at offset nodeoffset (this will be a | |
551 | * pointer to within the device blob itself, not a copy of the value). | |
46390da1 | 552 | * If lenp is non-NULL, the length of the property value is also |
8d04f02f KG |
553 | * returned, in the integer pointed to by lenp. |
554 | * | |
555 | * returns: | |
556 | * pointer to the property's value | |
557 | * if lenp is non-NULL, *lenp contains the length of the property | |
558 | * value (>=0) | |
559 | * NULL, on error | |
560 | * if lenp is non-NULL, *lenp contains an error code (<0): | |
561 | * -FDT_ERR_NOTFOUND, node does not have named property | |
562 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
563 | * -FDT_ERR_BADMAGIC, | |
564 | * -FDT_ERR_BADVERSION, | |
565 | * -FDT_ERR_BADSTATE, | |
566 | * -FDT_ERR_BADSTRUCTURE, | |
567 | * -FDT_ERR_TRUNCATED, standard meanings | |
568 | */ | |
569 | const void *fdt_getprop(const void *fdt, int nodeoffset, | |
570 | const char *name, int *lenp); | |
571 | static inline void *fdt_getprop_w(void *fdt, int nodeoffset, | |
572 | const char *name, int *lenp) | |
573 | { | |
c6683026 | 574 | return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp); |
8d04f02f KG |
575 | } |
576 | ||
577 | /** | |
46390da1 | 578 | * fdt_get_phandle - retrieve the phandle of a given node |
8d04f02f KG |
579 | * @fdt: pointer to the device tree blob |
580 | * @nodeoffset: structure block offset of the node | |
581 | * | |
582 | * fdt_get_phandle() retrieves the phandle of the device tree node at | |
583 | * structure block offset nodeoffset. | |
584 | * | |
585 | * returns: | |
46390da1 | 586 | * the phandle of the node at nodeoffset, on success (!= 0, != -1) |
8d04f02f KG |
587 | * 0, if the node has no phandle, or another error occurs |
588 | */ | |
589 | uint32_t fdt_get_phandle(const void *fdt, int nodeoffset); | |
590 | ||
9a6cf73a | 591 | /** |
cd3cb0d9 | 592 | * fdt_get_alias_namelen - get alias based on substring |
9a6cf73a DG |
593 | * @fdt: pointer to the device tree blob |
594 | * @name: name of the alias th look up | |
595 | * @namelen: number of characters of name to consider | |
596 | * | |
597 | * Identical to fdt_get_alias(), but only examine the first namelen | |
598 | * characters of name for matching the alias name. | |
599 | */ | |
600 | const char *fdt_get_alias_namelen(const void *fdt, | |
601 | const char *name, int namelen); | |
602 | ||
603 | /** | |
0596d35d | 604 | * fdt_get_alias - retreive the path referenced by a given alias |
9a6cf73a | 605 | * @fdt: pointer to the device tree blob |
0596d35d | 606 | * @name: name of the alias th look up |
9a6cf73a DG |
607 | * |
608 | * fdt_get_alias() retrieves the value of a given alias. That is, the | |
609 | * value of the property named 'name' in the node /aliases. | |
610 | * | |
611 | * returns: | |
c73bd49d | 612 | * a pointer to the expansion of the alias named 'name', if it exists |
9a6cf73a DG |
613 | * NULL, if the given alias or the /aliases node does not exist |
614 | */ | |
615 | const char *fdt_get_alias(const void *fdt, const char *name); | |
616 | ||
8d04f02f KG |
617 | /** |
618 | * fdt_get_path - determine the full path of a node | |
619 | * @fdt: pointer to the device tree blob | |
620 | * @nodeoffset: offset of the node whose path to find | |
621 | * @buf: character buffer to contain the returned path (will be overwritten) | |
622 | * @buflen: size of the character buffer at buf | |
623 | * | |
624 | * fdt_get_path() computes the full path of the node at offset | |
625 | * nodeoffset, and records that path in the buffer at buf. | |
626 | * | |
627 | * NOTE: This function is expensive, as it must scan the device tree | |
628 | * structure from the start to nodeoffset. | |
629 | * | |
630 | * returns: | |
631 | * 0, on success | |
632 | * buf contains the absolute path of the node at | |
633 | * nodeoffset, as a NUL-terminated string. | |
53677ef1 | 634 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
635 | * -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1) |
636 | * characters and will not fit in the given buffer. | |
637 | * -FDT_ERR_BADMAGIC, | |
638 | * -FDT_ERR_BADVERSION, | |
639 | * -FDT_ERR_BADSTATE, | |
640 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
641 | */ | |
642 | int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen); | |
643 | ||
644 | /** | |
645 | * fdt_supernode_atdepth_offset - find a specific ancestor of a node | |
646 | * @fdt: pointer to the device tree blob | |
647 | * @nodeoffset: offset of the node whose parent to find | |
648 | * @supernodedepth: depth of the ancestor to find | |
649 | * @nodedepth: pointer to an integer variable (will be overwritten) or NULL | |
650 | * | |
651 | * fdt_supernode_atdepth_offset() finds an ancestor of the given node | |
652 | * at a specific depth from the root (where the root itself has depth | |
653 | * 0, its immediate subnodes depth 1 and so forth). So | |
654 | * fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL); | |
655 | * will always return 0, the offset of the root node. If the node at | |
656 | * nodeoffset has depth D, then: | |
657 | * fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL); | |
658 | * will return nodeoffset itself. | |
659 | * | |
660 | * NOTE: This function is expensive, as it must scan the device tree | |
661 | * structure from the start to nodeoffset. | |
662 | * | |
663 | * returns: | |
664 | ||
665 | * structure block offset of the node at node offset's ancestor | |
666 | * of depth supernodedepth (>=0), on success | |
53677ef1 | 667 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
668 | * -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset |
669 | * -FDT_ERR_BADMAGIC, | |
670 | * -FDT_ERR_BADVERSION, | |
671 | * -FDT_ERR_BADSTATE, | |
672 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
673 | */ | |
674 | int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset, | |
675 | int supernodedepth, int *nodedepth); | |
676 | ||
677 | /** | |
678 | * fdt_node_depth - find the depth of a given node | |
679 | * @fdt: pointer to the device tree blob | |
680 | * @nodeoffset: offset of the node whose parent to find | |
681 | * | |
682 | * fdt_node_depth() finds the depth of a given node. The root node | |
683 | * has depth 0, its immediate subnodes depth 1 and so forth. | |
684 | * | |
685 | * NOTE: This function is expensive, as it must scan the device tree | |
686 | * structure from the start to nodeoffset. | |
687 | * | |
688 | * returns: | |
689 | * depth of the node at nodeoffset (>=0), on success | |
53677ef1 | 690 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
691 | * -FDT_ERR_BADMAGIC, |
692 | * -FDT_ERR_BADVERSION, | |
693 | * -FDT_ERR_BADSTATE, | |
694 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
695 | */ | |
696 | int fdt_node_depth(const void *fdt, int nodeoffset); | |
697 | ||
698 | /** | |
699 | * fdt_parent_offset - find the parent of a given node | |
700 | * @fdt: pointer to the device tree blob | |
701 | * @nodeoffset: offset of the node whose parent to find | |
702 | * | |
703 | * fdt_parent_offset() locates the parent node of a given node (that | |
704 | * is, it finds the offset of the node which contains the node at | |
705 | * nodeoffset as a subnode). | |
706 | * | |
707 | * NOTE: This function is expensive, as it must scan the device tree | |
708 | * structure from the start to nodeoffset, *twice*. | |
709 | * | |
710 | * returns: | |
46390da1 | 711 | * structure block offset of the parent of the node at nodeoffset |
8d04f02f | 712 | * (>=0), on success |
53677ef1 | 713 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
714 | * -FDT_ERR_BADMAGIC, |
715 | * -FDT_ERR_BADVERSION, | |
716 | * -FDT_ERR_BADSTATE, | |
717 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
718 | */ | |
719 | int fdt_parent_offset(const void *fdt, int nodeoffset); | |
720 | ||
721 | /** | |
722 | * fdt_node_offset_by_prop_value - find nodes with a given property value | |
723 | * @fdt: pointer to the device tree blob | |
724 | * @startoffset: only find nodes after this offset | |
725 | * @propname: property name to check | |
726 | * @propval: property value to search for | |
727 | * @proplen: length of the value in propval | |
728 | * | |
729 | * fdt_node_offset_by_prop_value() returns the offset of the first | |
730 | * node after startoffset, which has a property named propname whose | |
731 | * value is of length proplen and has value equal to propval; or if | |
732 | * startoffset is -1, the very first such node in the tree. | |
733 | * | |
734 | * To iterate through all nodes matching the criterion, the following | |
735 | * idiom can be used: | |
736 | * offset = fdt_node_offset_by_prop_value(fdt, -1, propname, | |
737 | * propval, proplen); | |
738 | * while (offset != -FDT_ERR_NOTFOUND) { | |
0596d35d | 739 | * // other code here |
8d04f02f KG |
740 | * offset = fdt_node_offset_by_prop_value(fdt, offset, propname, |
741 | * propval, proplen); | |
742 | * } | |
743 | * | |
744 | * Note the -1 in the first call to the function, if 0 is used here | |
745 | * instead, the function will never locate the root node, even if it | |
746 | * matches the criterion. | |
747 | * | |
748 | * returns: | |
749 | * structure block offset of the located node (>= 0, >startoffset), | |
750 | * on success | |
751 | * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the | |
752 | * tree after startoffset | |
53677ef1 | 753 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
754 | * -FDT_ERR_BADMAGIC, |
755 | * -FDT_ERR_BADVERSION, | |
756 | * -FDT_ERR_BADSTATE, | |
757 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
758 | */ | |
759 | int fdt_node_offset_by_prop_value(const void *fdt, int startoffset, | |
760 | const char *propname, | |
761 | const void *propval, int proplen); | |
762 | ||
763 | /** | |
764 | * fdt_node_offset_by_phandle - find the node with a given phandle | |
765 | * @fdt: pointer to the device tree blob | |
766 | * @phandle: phandle value | |
767 | * | |
46390da1 | 768 | * fdt_node_offset_by_phandle() returns the offset of the node |
8d04f02f KG |
769 | * which has the given phandle value. If there is more than one node |
770 | * in the tree with the given phandle (an invalid tree), results are | |
771 | * undefined. | |
772 | * | |
773 | * returns: | |
774 | * structure block offset of the located node (>= 0), on success | |
775 | * -FDT_ERR_NOTFOUND, no node with that phandle exists | |
776 | * -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1) | |
777 | * -FDT_ERR_BADMAGIC, | |
778 | * -FDT_ERR_BADVERSION, | |
779 | * -FDT_ERR_BADSTATE, | |
780 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
781 | */ | |
782 | int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle); | |
783 | ||
784 | /** | |
785 | * fdt_node_check_compatible: check a node's compatible property | |
786 | * @fdt: pointer to the device tree blob | |
787 | * @nodeoffset: offset of a tree node | |
788 | * @compatible: string to match against | |
789 | * | |
790 | * | |
791 | * fdt_node_check_compatible() returns 0 if the given node contains a | |
792 | * 'compatible' property with the given string as one of its elements, | |
793 | * it returns non-zero otherwise, or on error. | |
794 | * | |
795 | * returns: | |
796 | * 0, if the node has a 'compatible' property listing the given string | |
797 | * 1, if the node has a 'compatible' property, but it does not list | |
798 | * the given string | |
799 | * -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property | |
53677ef1 | 800 | * -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
801 | * -FDT_ERR_BADMAGIC, |
802 | * -FDT_ERR_BADVERSION, | |
803 | * -FDT_ERR_BADSTATE, | |
804 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
805 | */ | |
806 | int fdt_node_check_compatible(const void *fdt, int nodeoffset, | |
807 | const char *compatible); | |
7cd5da0f | 808 | |
8d04f02f KG |
809 | /** |
810 | * fdt_node_offset_by_compatible - find nodes with a given 'compatible' value | |
811 | * @fdt: pointer to the device tree blob | |
812 | * @startoffset: only find nodes after this offset | |
813 | * @compatible: 'compatible' string to match against | |
814 | * | |
815 | * fdt_node_offset_by_compatible() returns the offset of the first | |
816 | * node after startoffset, which has a 'compatible' property which | |
817 | * lists the given compatible string; or if startoffset is -1, the | |
818 | * very first such node in the tree. | |
819 | * | |
820 | * To iterate through all nodes matching the criterion, the following | |
821 | * idiom can be used: | |
822 | * offset = fdt_node_offset_by_compatible(fdt, -1, compatible); | |
823 | * while (offset != -FDT_ERR_NOTFOUND) { | |
0596d35d | 824 | * // other code here |
8d04f02f KG |
825 | * offset = fdt_node_offset_by_compatible(fdt, offset, compatible); |
826 | * } | |
827 | * | |
828 | * Note the -1 in the first call to the function, if 0 is used here | |
829 | * instead, the function will never locate the root node, even if it | |
830 | * matches the criterion. | |
831 | * | |
832 | * returns: | |
833 | * structure block offset of the located node (>= 0, >startoffset), | |
834 | * on success | |
835 | * -FDT_ERR_NOTFOUND, no node matching the criterion exists in the | |
836 | * tree after startoffset | |
53677ef1 | 837 | * -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag |
8d04f02f KG |
838 | * -FDT_ERR_BADMAGIC, |
839 | * -FDT_ERR_BADVERSION, | |
840 | * -FDT_ERR_BADSTATE, | |
841 | * -FDT_ERR_BADSTRUCTURE, standard meanings | |
842 | */ | |
843 | int fdt_node_offset_by_compatible(const void *fdt, int startoffset, | |
844 | const char *compatible); | |
7cd5da0f | 845 | |
e853b324 SG |
846 | /** |
847 | * fdt_stringlist_contains - check a string list property for a string | |
848 | * @strlist: Property containing a list of strings to check | |
849 | * @listlen: Length of property | |
850 | * @str: String to search for | |
851 | * | |
852 | * This is a utility function provided for convenience. The list contains | |
853 | * one or more strings, each terminated by \0, as is found in a device tree | |
854 | * "compatible" property. | |
855 | * | |
856 | * @return: 1 if the string is found in the list, 0 not found, or invalid list | |
857 | */ | |
858 | int fdt_stringlist_contains(const char *strlist, int listlen, const char *str); | |
859 | ||
0596d35d SG |
860 | /**********************************************************************/ |
861 | /* Read-only functions (addressing related) */ | |
862 | /**********************************************************************/ | |
863 | ||
864 | /** | |
865 | * FDT_MAX_NCELLS - maximum value for #address-cells and #size-cells | |
866 | * | |
867 | * This is the maximum value for #address-cells, #size-cells and | |
868 | * similar properties that will be processed by libfdt. IEE1275 | |
869 | * requires that OF implementations handle values up to 4. | |
870 | * Implementations may support larger values, but in practice higher | |
871 | * values aren't used. | |
872 | */ | |
873 | #define FDT_MAX_NCELLS 4 | |
874 | ||
875 | /** | |
876 | * fdt_address_cells - retrieve address size for a bus represented in the tree | |
877 | * @fdt: pointer to the device tree blob | |
878 | * @nodeoffset: offset of the node to find the address size for | |
879 | * | |
880 | * When the node has a valid #address-cells property, returns its value. | |
881 | * | |
882 | * returns: | |
883 | * 0 <= n < FDT_MAX_NCELLS, on success | |
884 | * 2, if the node has no #address-cells property | |
885 | * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid | |
886 | * #address-cells property | |
887 | * -FDT_ERR_BADMAGIC, | |
888 | * -FDT_ERR_BADVERSION, | |
889 | * -FDT_ERR_BADSTATE, | |
890 | * -FDT_ERR_BADSTRUCTURE, | |
891 | * -FDT_ERR_TRUNCATED, standard meanings | |
892 | */ | |
893 | int fdt_address_cells(const void *fdt, int nodeoffset); | |
894 | ||
895 | /** | |
896 | * fdt_size_cells - retrieve address range size for a bus represented in the | |
897 | * tree | |
898 | * @fdt: pointer to the device tree blob | |
899 | * @nodeoffset: offset of the node to find the address range size for | |
900 | * | |
901 | * When the node has a valid #size-cells property, returns its value. | |
902 | * | |
903 | * returns: | |
904 | * 0 <= n < FDT_MAX_NCELLS, on success | |
905 | * 2, if the node has no #address-cells property | |
906 | * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid | |
907 | * #size-cells property | |
908 | * -FDT_ERR_BADMAGIC, | |
909 | * -FDT_ERR_BADVERSION, | |
910 | * -FDT_ERR_BADSTATE, | |
911 | * -FDT_ERR_BADSTRUCTURE, | |
912 | * -FDT_ERR_TRUNCATED, standard meanings | |
913 | */ | |
914 | int fdt_size_cells(const void *fdt, int nodeoffset); | |
915 | ||
916 | ||
8d04f02f KG |
917 | /**********************************************************************/ |
918 | /* Write-in-place functions */ | |
919 | /**********************************************************************/ | |
3af0d587 | 920 | |
9d4450b5 DG |
921 | /** |
922 | * fdt_setprop_inplace - change a property's value, but not its size | |
923 | * @fdt: pointer to the device tree blob | |
924 | * @nodeoffset: offset of the node whose property to change | |
925 | * @name: name of the property to change | |
926 | * @val: pointer to data to replace the property value with | |
927 | * @len: length of the property value | |
928 | * | |
929 | * fdt_setprop_inplace() replaces the value of a given property with | |
930 | * the data in val, of length len. This function cannot change the | |
931 | * size of a property, and so will only work if len is equal to the | |
932 | * current length of the property. | |
933 | * | |
934 | * This function will alter only the bytes in the blob which contain | |
935 | * the given property value, and will not alter or move any other part | |
936 | * of the tree. | |
937 | * | |
938 | * returns: | |
939 | * 0, on success | |
940 | * -FDT_ERR_NOSPACE, if len is not equal to the property's current length | |
941 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
942 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
943 | * -FDT_ERR_BADMAGIC, | |
944 | * -FDT_ERR_BADVERSION, | |
945 | * -FDT_ERR_BADSTATE, | |
946 | * -FDT_ERR_BADSTRUCTURE, | |
947 | * -FDT_ERR_TRUNCATED, standard meanings | |
948 | */ | |
7cd5da0f GVB |
949 | int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, |
950 | const void *val, int len); | |
9d4450b5 DG |
951 | |
952 | /** | |
24fa0e58 | 953 | * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property |
9d4450b5 DG |
954 | * @fdt: pointer to the device tree blob |
955 | * @nodeoffset: offset of the node whose property to change | |
956 | * @name: name of the property to change | |
24fa0e58 | 957 | * @val: 32-bit integer value to replace the property with |
9d4450b5 | 958 | * |
24fa0e58 DG |
959 | * fdt_setprop_inplace_u32() replaces the value of a given property |
960 | * with the 32-bit integer value in val, converting val to big-endian | |
961 | * if necessary. This function cannot change the size of a property, | |
962 | * and so will only work if the property already exists and has length | |
963 | * 4. | |
9d4450b5 DG |
964 | * |
965 | * This function will alter only the bytes in the blob which contain | |
966 | * the given property value, and will not alter or move any other part | |
967 | * of the tree. | |
968 | * | |
969 | * returns: | |
970 | * 0, on success | |
971 | * -FDT_ERR_NOSPACE, if the property's length is not equal to 4 | |
24fa0e58 | 972 | * -FDT_ERR_NOTFOUND, node does not have the named property |
9d4450b5 DG |
973 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag |
974 | * -FDT_ERR_BADMAGIC, | |
975 | * -FDT_ERR_BADVERSION, | |
976 | * -FDT_ERR_BADSTATE, | |
977 | * -FDT_ERR_BADSTRUCTURE, | |
978 | * -FDT_ERR_TRUNCATED, standard meanings | |
979 | */ | |
24fa0e58 DG |
980 | static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset, |
981 | const char *name, uint32_t val) | |
8d04f02f | 982 | { |
b2ba62a1 KP |
983 | fdt32_t tmp = cpu_to_fdt32(val); |
984 | return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
8d04f02f | 985 | } |
7cd5da0f | 986 | |
24fa0e58 DG |
987 | /** |
988 | * fdt_setprop_inplace_u64 - change the value of a 64-bit integer property | |
989 | * @fdt: pointer to the device tree blob | |
990 | * @nodeoffset: offset of the node whose property to change | |
991 | * @name: name of the property to change | |
992 | * @val: 64-bit integer value to replace the property with | |
993 | * | |
994 | * fdt_setprop_inplace_u64() replaces the value of a given property | |
995 | * with the 64-bit integer value in val, converting val to big-endian | |
996 | * if necessary. This function cannot change the size of a property, | |
997 | * and so will only work if the property already exists and has length | |
998 | * 8. | |
999 | * | |
1000 | * This function will alter only the bytes in the blob which contain | |
1001 | * the given property value, and will not alter or move any other part | |
1002 | * of the tree. | |
1003 | * | |
1004 | * returns: | |
1005 | * 0, on success | |
1006 | * -FDT_ERR_NOSPACE, if the property's length is not equal to 8 | |
1007 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1008 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1009 | * -FDT_ERR_BADMAGIC, | |
1010 | * -FDT_ERR_BADVERSION, | |
1011 | * -FDT_ERR_BADSTATE, | |
1012 | * -FDT_ERR_BADSTRUCTURE, | |
1013 | * -FDT_ERR_TRUNCATED, standard meanings | |
1014 | */ | |
1015 | static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset, | |
1016 | const char *name, uint64_t val) | |
1017 | { | |
b2ba62a1 KP |
1018 | fdt64_t tmp = cpu_to_fdt64(val); |
1019 | return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1020 | } |
1021 | ||
1022 | /** | |
1023 | * fdt_setprop_inplace_cell - change the value of a single-cell property | |
1024 | * | |
1025 | * This is an alternative name for fdt_setprop_inplace_u32() | |
1026 | */ | |
1027 | static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset, | |
1028 | const char *name, uint32_t val) | |
1029 | { | |
1030 | return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val); | |
1031 | } | |
1032 | ||
9d4450b5 DG |
1033 | /** |
1034 | * fdt_nop_property - replace a property with nop tags | |
1035 | * @fdt: pointer to the device tree blob | |
1036 | * @nodeoffset: offset of the node whose property to nop | |
1037 | * @name: name of the property to nop | |
1038 | * | |
1039 | * fdt_nop_property() will replace a given property's representation | |
1040 | * in the blob with FDT_NOP tags, effectively removing it from the | |
1041 | * tree. | |
1042 | * | |
1043 | * This function will alter only the bytes in the blob which contain | |
1044 | * the property, and will not alter or move any other part of the | |
1045 | * tree. | |
1046 | * | |
1047 | * returns: | |
1048 | * 0, on success | |
1049 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1050 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1051 | * -FDT_ERR_BADMAGIC, | |
1052 | * -FDT_ERR_BADVERSION, | |
1053 | * -FDT_ERR_BADSTATE, | |
1054 | * -FDT_ERR_BADSTRUCTURE, | |
1055 | * -FDT_ERR_TRUNCATED, standard meanings | |
1056 | */ | |
7cd5da0f | 1057 | int fdt_nop_property(void *fdt, int nodeoffset, const char *name); |
9d4450b5 DG |
1058 | |
1059 | /** | |
1060 | * fdt_nop_node - replace a node (subtree) with nop tags | |
1061 | * @fdt: pointer to the device tree blob | |
1062 | * @nodeoffset: offset of the node to nop | |
1063 | * | |
1064 | * fdt_nop_node() will replace a given node's representation in the | |
1065 | * blob, including all its subnodes, if any, with FDT_NOP tags, | |
1066 | * effectively removing it from the tree. | |
1067 | * | |
1068 | * This function will alter only the bytes in the blob which contain | |
1069 | * the node and its properties and subnodes, and will not alter or | |
1070 | * move any other part of the tree. | |
1071 | * | |
1072 | * returns: | |
1073 | * 0, on success | |
1074 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1075 | * -FDT_ERR_BADMAGIC, | |
1076 | * -FDT_ERR_BADVERSION, | |
1077 | * -FDT_ERR_BADSTATE, | |
1078 | * -FDT_ERR_BADSTRUCTURE, | |
1079 | * -FDT_ERR_TRUNCATED, standard meanings | |
1080 | */ | |
7cd5da0f | 1081 | int fdt_nop_node(void *fdt, int nodeoffset); |
3f9f08cf | 1082 | |
8d04f02f KG |
1083 | /**********************************************************************/ |
1084 | /* Sequential write functions */ | |
1085 | /**********************************************************************/ | |
7cd5da0f | 1086 | |
7cd5da0f | 1087 | int fdt_create(void *buf, int bufsize); |
0596d35d | 1088 | int fdt_resize(void *fdt, void *buf, int bufsize); |
7cd5da0f GVB |
1089 | int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size); |
1090 | int fdt_finish_reservemap(void *fdt); | |
1091 | int fdt_begin_node(void *fdt, const char *name); | |
1092 | int fdt_property(void *fdt, const char *name, const void *val, int len); | |
24fa0e58 | 1093 | static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val) |
8d04f02f | 1094 | { |
b2ba62a1 KP |
1095 | fdt32_t tmp = cpu_to_fdt32(val); |
1096 | return fdt_property(fdt, name, &tmp, sizeof(tmp)); | |
8d04f02f | 1097 | } |
24fa0e58 DG |
1098 | static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val) |
1099 | { | |
b2ba62a1 KP |
1100 | fdt64_t tmp = cpu_to_fdt64(val); |
1101 | return fdt_property(fdt, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1102 | } |
1103 | static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val) | |
1104 | { | |
1105 | return fdt_property_u32(fdt, name, val); | |
1106 | } | |
7cd5da0f GVB |
1107 | #define fdt_property_string(fdt, name, str) \ |
1108 | fdt_property(fdt, name, str, strlen(str)+1) | |
1109 | int fdt_end_node(void *fdt); | |
1110 | int fdt_finish(void *fdt); | |
1111 | ||
8d04f02f KG |
1112 | /**********************************************************************/ |
1113 | /* Read-write functions */ | |
1114 | /**********************************************************************/ | |
1115 | ||
c71b64f3 | 1116 | int fdt_create_empty_tree(void *buf, int bufsize); |
8d04f02f | 1117 | int fdt_open_into(const void *fdt, void *buf, int bufsize); |
7cd5da0f GVB |
1118 | int fdt_pack(void *fdt); |
1119 | ||
aec7135b DG |
1120 | /** |
1121 | * fdt_add_mem_rsv - add one memory reserve map entry | |
1122 | * @fdt: pointer to the device tree blob | |
46390da1 | 1123 | * @address, @size: 64-bit values (native endian) |
aec7135b DG |
1124 | * |
1125 | * Adds a reserve map entry to the given blob reserving a region at | |
1126 | * address address of length size. | |
1127 | * | |
1128 | * This function will insert data into the reserve map and will | |
46390da1 | 1129 | * therefore change the indexes of some entries in the table. |
aec7135b DG |
1130 | * |
1131 | * returns: | |
1132 | * 0, on success | |
1133 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1134 | * contain the new reservation entry | |
1135 | * -FDT_ERR_BADMAGIC, | |
1136 | * -FDT_ERR_BADVERSION, | |
1137 | * -FDT_ERR_BADSTATE, | |
1138 | * -FDT_ERR_BADSTRUCTURE, | |
1139 | * -FDT_ERR_BADLAYOUT, | |
1140 | * -FDT_ERR_TRUNCATED, standard meanings | |
1141 | */ | |
8d04f02f | 1142 | int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size); |
aec7135b DG |
1143 | |
1144 | /** | |
1145 | * fdt_del_mem_rsv - remove a memory reserve map entry | |
1146 | * @fdt: pointer to the device tree blob | |
1147 | * @n: entry to remove | |
1148 | * | |
1149 | * fdt_del_mem_rsv() removes the n-th memory reserve map entry from | |
1150 | * the blob. | |
1151 | * | |
1152 | * This function will delete data from the reservation table and will | |
46390da1 | 1153 | * therefore change the indexes of some entries in the table. |
aec7135b DG |
1154 | * |
1155 | * returns: | |
1156 | * 0, on success | |
1157 | * -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there | |
1158 | * are less than n+1 reserve map entries) | |
1159 | * -FDT_ERR_BADMAGIC, | |
1160 | * -FDT_ERR_BADVERSION, | |
1161 | * -FDT_ERR_BADSTATE, | |
1162 | * -FDT_ERR_BADSTRUCTURE, | |
1163 | * -FDT_ERR_BADLAYOUT, | |
1164 | * -FDT_ERR_TRUNCATED, standard meanings | |
1165 | */ | |
8d04f02f KG |
1166 | int fdt_del_mem_rsv(void *fdt, int n); |
1167 | ||
9eaeb07a DG |
1168 | /** |
1169 | * fdt_set_name - change the name of a given node | |
1170 | * @fdt: pointer to the device tree blob | |
1171 | * @nodeoffset: structure block offset of a node | |
1172 | * @name: name to give the node | |
1173 | * | |
1174 | * fdt_set_name() replaces the name (including unit address, if any) | |
1175 | * of the given node with the given string. NOTE: this function can't | |
1176 | * efficiently check if the new name is unique amongst the given | |
1177 | * node's siblings; results are undefined if this function is invoked | |
1178 | * with a name equal to one of the given node's siblings. | |
1179 | * | |
1180 | * This function may insert or delete data from the blob, and will | |
1181 | * therefore change the offsets of some existing nodes. | |
1182 | * | |
1183 | * returns: | |
1184 | * 0, on success | |
1185 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob | |
1186 | * to contain the new name | |
1187 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1188 | * -FDT_ERR_BADMAGIC, | |
1189 | * -FDT_ERR_BADVERSION, | |
1190 | * -FDT_ERR_BADSTATE, standard meanings | |
1191 | */ | |
1192 | int fdt_set_name(void *fdt, int nodeoffset, const char *name); | |
1193 | ||
aec7135b DG |
1194 | /** |
1195 | * fdt_setprop - create or change a property | |
1196 | * @fdt: pointer to the device tree blob | |
1197 | * @nodeoffset: offset of the node whose property to change | |
1198 | * @name: name of the property to change | |
1199 | * @val: pointer to data to set the property value to | |
1200 | * @len: length of the property value | |
1201 | * | |
1202 | * fdt_setprop() sets the value of the named property in the given | |
46390da1 | 1203 | * node to the given value and length, creating the property if it |
aec7135b DG |
1204 | * does not already exist. |
1205 | * | |
1206 | * This function may insert or delete data from the blob, and will | |
1207 | * therefore change the offsets of some existing nodes. | |
1208 | * | |
1209 | * returns: | |
1210 | * 0, on success | |
1211 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1212 | * contain the new property value | |
1213 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1214 | * -FDT_ERR_BADLAYOUT, | |
1215 | * -FDT_ERR_BADMAGIC, | |
1216 | * -FDT_ERR_BADVERSION, | |
1217 | * -FDT_ERR_BADSTATE, | |
1218 | * -FDT_ERR_BADSTRUCTURE, | |
1219 | * -FDT_ERR_BADLAYOUT, | |
1220 | * -FDT_ERR_TRUNCATED, standard meanings | |
1221 | */ | |
7cd5da0f GVB |
1222 | int fdt_setprop(void *fdt, int nodeoffset, const char *name, |
1223 | const void *val, int len); | |
aec7135b DG |
1224 | |
1225 | /** | |
24fa0e58 | 1226 | * fdt_setprop_u32 - set a property to a 32-bit integer |
aec7135b DG |
1227 | * @fdt: pointer to the device tree blob |
1228 | * @nodeoffset: offset of the node whose property to change | |
1229 | * @name: name of the property to change | |
1230 | * @val: 32-bit integer value for the property (native endian) | |
1231 | * | |
24fa0e58 DG |
1232 | * fdt_setprop_u32() sets the value of the named property in the given |
1233 | * node to the given 32-bit integer value (converting to big-endian if | |
aec7135b DG |
1234 | * necessary), or creates a new property with that value if it does |
1235 | * not already exist. | |
1236 | * | |
1237 | * This function may insert or delete data from the blob, and will | |
1238 | * therefore change the offsets of some existing nodes. | |
1239 | * | |
1240 | * returns: | |
1241 | * 0, on success | |
1242 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1243 | * contain the new property value | |
1244 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1245 | * -FDT_ERR_BADLAYOUT, | |
1246 | * -FDT_ERR_BADMAGIC, | |
1247 | * -FDT_ERR_BADVERSION, | |
1248 | * -FDT_ERR_BADSTATE, | |
1249 | * -FDT_ERR_BADSTRUCTURE, | |
1250 | * -FDT_ERR_BADLAYOUT, | |
1251 | * -FDT_ERR_TRUNCATED, standard meanings | |
1252 | */ | |
24fa0e58 DG |
1253 | static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name, |
1254 | uint32_t val) | |
8d04f02f | 1255 | { |
b2ba62a1 KP |
1256 | fdt32_t tmp = cpu_to_fdt32(val); |
1257 | return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
8d04f02f | 1258 | } |
aec7135b | 1259 | |
24fa0e58 DG |
1260 | /** |
1261 | * fdt_setprop_u64 - set a property to a 64-bit integer | |
1262 | * @fdt: pointer to the device tree blob | |
1263 | * @nodeoffset: offset of the node whose property to change | |
1264 | * @name: name of the property to change | |
1265 | * @val: 64-bit integer value for the property (native endian) | |
1266 | * | |
1267 | * fdt_setprop_u64() sets the value of the named property in the given | |
1268 | * node to the given 64-bit integer value (converting to big-endian if | |
1269 | * necessary), or creates a new property with that value if it does | |
1270 | * not already exist. | |
1271 | * | |
1272 | * This function may insert or delete data from the blob, and will | |
1273 | * therefore change the offsets of some existing nodes. | |
1274 | * | |
1275 | * returns: | |
1276 | * 0, on success | |
1277 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1278 | * contain the new property value | |
1279 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1280 | * -FDT_ERR_BADLAYOUT, | |
1281 | * -FDT_ERR_BADMAGIC, | |
1282 | * -FDT_ERR_BADVERSION, | |
1283 | * -FDT_ERR_BADSTATE, | |
1284 | * -FDT_ERR_BADSTRUCTURE, | |
1285 | * -FDT_ERR_BADLAYOUT, | |
1286 | * -FDT_ERR_TRUNCATED, standard meanings | |
1287 | */ | |
1288 | static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name, | |
1289 | uint64_t val) | |
1290 | { | |
b2ba62a1 KP |
1291 | fdt64_t tmp = cpu_to_fdt64(val); |
1292 | return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1293 | } |
1294 | ||
1295 | /** | |
1296 | * fdt_setprop_cell - set a property to a single cell value | |
1297 | * | |
1298 | * This is an alternative name for fdt_setprop_u32() | |
1299 | */ | |
1300 | static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name, | |
1301 | uint32_t val) | |
1302 | { | |
1303 | return fdt_setprop_u32(fdt, nodeoffset, name, val); | |
1304 | } | |
1305 | ||
aec7135b DG |
1306 | /** |
1307 | * fdt_setprop_string - set a property to a string value | |
1308 | * @fdt: pointer to the device tree blob | |
1309 | * @nodeoffset: offset of the node whose property to change | |
1310 | * @name: name of the property to change | |
1311 | * @str: string value for the property | |
1312 | * | |
1313 | * fdt_setprop_string() sets the value of the named property in the | |
1314 | * given node to the given string value (using the length of the | |
1315 | * string to determine the new length of the property), or creates a | |
1316 | * new property with that value if it does not already exist. | |
1317 | * | |
1318 | * This function may insert or delete data from the blob, and will | |
1319 | * therefore change the offsets of some existing nodes. | |
1320 | * | |
1321 | * returns: | |
1322 | * 0, on success | |
1323 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1324 | * contain the new property value | |
1325 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1326 | * -FDT_ERR_BADLAYOUT, | |
1327 | * -FDT_ERR_BADMAGIC, | |
1328 | * -FDT_ERR_BADVERSION, | |
1329 | * -FDT_ERR_BADSTATE, | |
1330 | * -FDT_ERR_BADSTRUCTURE, | |
1331 | * -FDT_ERR_BADLAYOUT, | |
1332 | * -FDT_ERR_TRUNCATED, standard meanings | |
1333 | */ | |
7cd5da0f GVB |
1334 | #define fdt_setprop_string(fdt, nodeoffset, name, str) \ |
1335 | fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) | |
aec7135b | 1336 | |
36ad18a6 ML |
1337 | /** |
1338 | * fdt_appendprop - append to or create a property | |
1339 | * @fdt: pointer to the device tree blob | |
1340 | * @nodeoffset: offset of the node whose property to change | |
1341 | * @name: name of the property to append to | |
1342 | * @val: pointer to data to append to the property value | |
1343 | * @len: length of the data to append to the property value | |
1344 | * | |
1345 | * fdt_appendprop() appends the value to the named property in the | |
1346 | * given node, creating the property if it does not already exist. | |
1347 | * | |
1348 | * This function may insert data into the blob, and will therefore | |
1349 | * change the offsets of some existing nodes. | |
1350 | * | |
1351 | * returns: | |
1352 | * 0, on success | |
1353 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1354 | * contain the new property value | |
1355 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1356 | * -FDT_ERR_BADLAYOUT, | |
1357 | * -FDT_ERR_BADMAGIC, | |
1358 | * -FDT_ERR_BADVERSION, | |
1359 | * -FDT_ERR_BADSTATE, | |
1360 | * -FDT_ERR_BADSTRUCTURE, | |
1361 | * -FDT_ERR_BADLAYOUT, | |
1362 | * -FDT_ERR_TRUNCATED, standard meanings | |
1363 | */ | |
1364 | int fdt_appendprop(void *fdt, int nodeoffset, const char *name, | |
1365 | const void *val, int len); | |
1366 | ||
1367 | /** | |
24fa0e58 | 1368 | * fdt_appendprop_u32 - append a 32-bit integer value to a property |
36ad18a6 ML |
1369 | * @fdt: pointer to the device tree blob |
1370 | * @nodeoffset: offset of the node whose property to change | |
1371 | * @name: name of the property to change | |
1372 | * @val: 32-bit integer value to append to the property (native endian) | |
1373 | * | |
24fa0e58 DG |
1374 | * fdt_appendprop_u32() appends the given 32-bit integer value |
1375 | * (converting to big-endian if necessary) to the value of the named | |
1376 | * property in the given node, or creates a new property with that | |
1377 | * value if it does not already exist. | |
36ad18a6 ML |
1378 | * |
1379 | * This function may insert data into the blob, and will therefore | |
1380 | * change the offsets of some existing nodes. | |
1381 | * | |
1382 | * returns: | |
1383 | * 0, on success | |
1384 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1385 | * contain the new property value | |
1386 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1387 | * -FDT_ERR_BADLAYOUT, | |
1388 | * -FDT_ERR_BADMAGIC, | |
1389 | * -FDT_ERR_BADVERSION, | |
1390 | * -FDT_ERR_BADSTATE, | |
1391 | * -FDT_ERR_BADSTRUCTURE, | |
1392 | * -FDT_ERR_BADLAYOUT, | |
1393 | * -FDT_ERR_TRUNCATED, standard meanings | |
1394 | */ | |
24fa0e58 DG |
1395 | static inline int fdt_appendprop_u32(void *fdt, int nodeoffset, |
1396 | const char *name, uint32_t val) | |
36ad18a6 | 1397 | { |
b2ba62a1 KP |
1398 | fdt32_t tmp = cpu_to_fdt32(val); |
1399 | return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
36ad18a6 ML |
1400 | } |
1401 | ||
24fa0e58 DG |
1402 | /** |
1403 | * fdt_appendprop_u64 - append a 64-bit integer value to a property | |
1404 | * @fdt: pointer to the device tree blob | |
1405 | * @nodeoffset: offset of the node whose property to change | |
1406 | * @name: name of the property to change | |
1407 | * @val: 64-bit integer value to append to the property (native endian) | |
1408 | * | |
1409 | * fdt_appendprop_u64() appends the given 64-bit integer value | |
1410 | * (converting to big-endian if necessary) to the value of the named | |
1411 | * property in the given node, or creates a new property with that | |
1412 | * value if it does not already exist. | |
1413 | * | |
1414 | * This function may insert data into the blob, and will therefore | |
1415 | * change the offsets of some existing nodes. | |
1416 | * | |
1417 | * returns: | |
1418 | * 0, on success | |
1419 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1420 | * contain the new property value | |
1421 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1422 | * -FDT_ERR_BADLAYOUT, | |
1423 | * -FDT_ERR_BADMAGIC, | |
1424 | * -FDT_ERR_BADVERSION, | |
1425 | * -FDT_ERR_BADSTATE, | |
1426 | * -FDT_ERR_BADSTRUCTURE, | |
1427 | * -FDT_ERR_BADLAYOUT, | |
1428 | * -FDT_ERR_TRUNCATED, standard meanings | |
1429 | */ | |
1430 | static inline int fdt_appendprop_u64(void *fdt, int nodeoffset, | |
1431 | const char *name, uint64_t val) | |
1432 | { | |
b2ba62a1 KP |
1433 | fdt64_t tmp = cpu_to_fdt64(val); |
1434 | return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp)); | |
24fa0e58 DG |
1435 | } |
1436 | ||
1437 | /** | |
1438 | * fdt_appendprop_cell - append a single cell value to a property | |
1439 | * | |
1440 | * This is an alternative name for fdt_appendprop_u32() | |
1441 | */ | |
1442 | static inline int fdt_appendprop_cell(void *fdt, int nodeoffset, | |
1443 | const char *name, uint32_t val) | |
1444 | { | |
1445 | return fdt_appendprop_u32(fdt, nodeoffset, name, val); | |
1446 | } | |
1447 | ||
36ad18a6 ML |
1448 | /** |
1449 | * fdt_appendprop_string - append a string to a property | |
1450 | * @fdt: pointer to the device tree blob | |
1451 | * @nodeoffset: offset of the node whose property to change | |
1452 | * @name: name of the property to change | |
1453 | * @str: string value to append to the property | |
1454 | * | |
1455 | * fdt_appendprop_string() appends the given string to the value of | |
1456 | * the named property in the given node, or creates a new property | |
1457 | * with that value if it does not already exist. | |
1458 | * | |
1459 | * This function may insert data into the blob, and will therefore | |
1460 | * change the offsets of some existing nodes. | |
1461 | * | |
1462 | * returns: | |
1463 | * 0, on success | |
1464 | * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to | |
1465 | * contain the new property value | |
1466 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1467 | * -FDT_ERR_BADLAYOUT, | |
1468 | * -FDT_ERR_BADMAGIC, | |
1469 | * -FDT_ERR_BADVERSION, | |
1470 | * -FDT_ERR_BADSTATE, | |
1471 | * -FDT_ERR_BADSTRUCTURE, | |
1472 | * -FDT_ERR_BADLAYOUT, | |
1473 | * -FDT_ERR_TRUNCATED, standard meanings | |
1474 | */ | |
1475 | #define fdt_appendprop_string(fdt, nodeoffset, name, str) \ | |
1476 | fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) | |
1477 | ||
aec7135b DG |
1478 | /** |
1479 | * fdt_delprop - delete a property | |
1480 | * @fdt: pointer to the device tree blob | |
1481 | * @nodeoffset: offset of the node whose property to nop | |
1482 | * @name: name of the property to nop | |
1483 | * | |
1484 | * fdt_del_property() will delete the given property. | |
1485 | * | |
1486 | * This function will delete data from the blob, and will therefore | |
1487 | * change the offsets of some existing nodes. | |
1488 | * | |
1489 | * returns: | |
1490 | * 0, on success | |
1491 | * -FDT_ERR_NOTFOUND, node does not have the named property | |
1492 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1493 | * -FDT_ERR_BADLAYOUT, | |
1494 | * -FDT_ERR_BADMAGIC, | |
1495 | * -FDT_ERR_BADVERSION, | |
1496 | * -FDT_ERR_BADSTATE, | |
1497 | * -FDT_ERR_BADSTRUCTURE, | |
1498 | * -FDT_ERR_TRUNCATED, standard meanings | |
1499 | */ | |
7cd5da0f | 1500 | int fdt_delprop(void *fdt, int nodeoffset, const char *name); |
aec7135b DG |
1501 | |
1502 | /** | |
1503 | * fdt_add_subnode_namelen - creates a new node based on substring | |
1504 | * @fdt: pointer to the device tree blob | |
1505 | * @parentoffset: structure block offset of a node | |
1506 | * @name: name of the subnode to locate | |
1507 | * @namelen: number of characters of name to consider | |
1508 | * | |
1509 | * Identical to fdt_add_subnode(), but use only the first namelen | |
1510 | * characters of name as the name of the new node. This is useful for | |
1511 | * creating subnodes based on a portion of a larger string, such as a | |
1512 | * full path. | |
1513 | */ | |
7cd5da0f GVB |
1514 | int fdt_add_subnode_namelen(void *fdt, int parentoffset, |
1515 | const char *name, int namelen); | |
aec7135b DG |
1516 | |
1517 | /** | |
1518 | * fdt_add_subnode - creates a new node | |
1519 | * @fdt: pointer to the device tree blob | |
1520 | * @parentoffset: structure block offset of a node | |
1521 | * @name: name of the subnode to locate | |
1522 | * | |
1523 | * fdt_add_subnode() creates a new node as a subnode of the node at | |
1524 | * structure block offset parentoffset, with the given name (which | |
1525 | * should include the unit address, if any). | |
1526 | * | |
1527 | * This function will insert data into the blob, and will therefore | |
1528 | * change the offsets of some existing nodes. | |
1529 | ||
1530 | * returns: | |
1531 | * structure block offset of the created nodeequested subnode (>=0), on success | |
1532 | * -FDT_ERR_NOTFOUND, if the requested subnode does not exist | |
1533 | * -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag | |
1534 | * -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of | |
1535 | * the given name | |
1536 | * -FDT_ERR_NOSPACE, if there is insufficient free space in the | |
1537 | * blob to contain the new node | |
1538 | * -FDT_ERR_NOSPACE | |
1539 | * -FDT_ERR_BADLAYOUT | |
1540 | * -FDT_ERR_BADMAGIC, | |
1541 | * -FDT_ERR_BADVERSION, | |
1542 | * -FDT_ERR_BADSTATE, | |
1543 | * -FDT_ERR_BADSTRUCTURE, | |
1544 | * -FDT_ERR_TRUNCATED, standard meanings. | |
1545 | */ | |
7cd5da0f | 1546 | int fdt_add_subnode(void *fdt, int parentoffset, const char *name); |
aec7135b DG |
1547 | |
1548 | /** | |
1549 | * fdt_del_node - delete a node (subtree) | |
1550 | * @fdt: pointer to the device tree blob | |
1551 | * @nodeoffset: offset of the node to nop | |
1552 | * | |
1553 | * fdt_del_node() will remove the given node, including all its | |
1554 | * subnodes if any, from the blob. | |
1555 | * | |
1556 | * This function will delete data from the blob, and will therefore | |
1557 | * change the offsets of some existing nodes. | |
1558 | * | |
1559 | * returns: | |
1560 | * 0, on success | |
1561 | * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag | |
1562 | * -FDT_ERR_BADLAYOUT, | |
1563 | * -FDT_ERR_BADMAGIC, | |
1564 | * -FDT_ERR_BADVERSION, | |
1565 | * -FDT_ERR_BADSTATE, | |
1566 | * -FDT_ERR_BADSTRUCTURE, | |
1567 | * -FDT_ERR_TRUNCATED, standard meanings | |
1568 | */ | |
7cd5da0f GVB |
1569 | int fdt_del_node(void *fdt, int nodeoffset); |
1570 | ||
8d04f02f KG |
1571 | /**********************************************************************/ |
1572 | /* Debugging / informational functions */ | |
1573 | /**********************************************************************/ | |
1574 | ||
7cd5da0f GVB |
1575 | const char *fdt_strerror(int errval); |
1576 | ||
3e06cd1f SG |
1577 | struct fdt_region { |
1578 | int offset; | |
1579 | int size; | |
1580 | }; | |
1581 | ||
1582 | /** | |
1583 | * fdt_find_regions() - find regions in device tree | |
1584 | * | |
1585 | * Given a list of nodes to include and properties to exclude, find | |
1586 | * the regions of the device tree which describe those included parts. | |
1587 | * | |
1588 | * The intent is to get a list of regions which will be invariant provided | |
1589 | * those parts are invariant. For example, if you request a list of regions | |
1590 | * for all nodes but exclude the property "data", then you will get the | |
1591 | * same region contents regardless of any change to "data" properties. | |
1592 | * | |
1593 | * This function can be used to produce a byte-stream to send to a hashing | |
1594 | * function to verify that critical parts of the FDT have not changed. | |
1595 | * | |
1596 | * Nodes which are given in 'inc' are included in the region list, as | |
1597 | * are the names of the immediate subnodes nodes (but not the properties | |
1598 | * or subnodes of those subnodes). | |
1599 | * | |
1600 | * For eaxample "/" means to include the root node, all root properties | |
1601 | * and the FDT_BEGIN_NODE and FDT_END_NODE of all subnodes of /. The latter | |
1602 | * ensures that we capture the names of the subnodes. In a hashing situation | |
1603 | * it prevents the root node from changing at all Any change to non-excluded | |
1604 | * properties, names of subnodes or number of subnodes would be detected. | |
1605 | * | |
1606 | * When used with FITs this provides the ability to hash and sign parts of | |
1607 | * the FIT based on different configurations in the FIT. Then it is | |
1608 | * impossible to change anything about that configuration (include images | |
1609 | * attached to the configuration), but it may be possible to add new | |
1610 | * configurations, new images or new signatures within the existing | |
1611 | * framework. | |
1612 | * | |
1613 | * Adding new properties to a device tree may result in the string table | |
1614 | * being extended (if the new property names are different from those | |
1615 | * already added). This function can optionally include a region for | |
1616 | * the string table so that this can be part of the hash too. | |
1617 | * | |
1618 | * The device tree header is not included in the list. | |
1619 | * | |
1620 | * @fdt: Device tree to check | |
1621 | * @inc: List of node paths to included | |
1622 | * @inc_count: Number of node paths in list | |
1623 | * @exc_prop: List of properties names to exclude | |
1624 | * @exc_prop_count: Number of properties in exclude list | |
1625 | * @region: Returns list of regions | |
1626 | * @max_region: Maximum length of region list | |
1627 | * @path: Pointer to a temporary string for the function to use for | |
1628 | * building path names | |
1629 | * @path_len: Length of path, must be large enough to hold the longest | |
1630 | * path in the tree | |
1631 | * @add_string_tab: 1 to add a region for the string table | |
1632 | * @return number of regions in list. If this is >max_regions then the | |
1633 | * region array was exhausted. You should increase max_regions and try | |
1634 | * the call again. | |
1635 | */ | |
1636 | int fdt_find_regions(const void *fdt, char * const inc[], int inc_count, | |
1637 | char * const exc_prop[], int exc_prop_count, | |
1638 | struct fdt_region region[], int max_regions, | |
1639 | char *path, int path_len, int add_string_tab); | |
1640 | ||
7cd5da0f | 1641 | #endif /* _LIBFDT_H */ |