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1/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 *
5 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
7 *
8 * a) This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21 * MA 02110-1301 USA
22 *
23 * Alternatively,
24 *
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
27 * conditions are met:
28 *
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer.
32 * 2. Redistributions in binary form must reproduce the above
33 * copyright notice, this list of conditions and the following
34 * disclaimer in the documentation and/or other materials
35 * provided with the distribution.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50 */
51#include "libfdt_env.h"
52
53#include <fdt.h>
54#include <libfdt.h>
55
56#include "libfdt_internal.h"
57
58static int _fdt_nodename_eq(const void *fdt, int offset,
59 const char *s, int len)
60{
61 const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
62
63 if (! p)
64 /* short match */
65 return 0;
66
67 if (memcmp(p, s, len) != 0)
68 return 0;
69
70 if (p[len] == '\0')
71 return 1;
72 else if (!memchr(s, '@', len) && (p[len] == '@'))
73 return 1;
74 else
75 return 0;
76}
77
78const char *fdt_string(const void *fdt, int stroffset)
79{
80 return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
81}
82
83int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
84{
85 FDT_CHECK_HEADER(fdt);
86 *address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
87 *size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
88 return 0;
89}
90
91int fdt_num_mem_rsv(const void *fdt)
92{
93 int i = 0;
94
95 while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
96 i++;
97 return i;
98}
99
100int fdt_subnode_offset_namelen(const void *fdt, int offset,
101 const char *name, int namelen)
102{
103 int depth;
104
105 FDT_CHECK_HEADER(fdt);
106
107 for (depth = 0, offset = fdt_next_node(fdt, offset, &depth);
108 (offset >= 0) && (depth > 0);
109 offset = fdt_next_node(fdt, offset, &depth)) {
110 if (depth < 0)
111 return -FDT_ERR_NOTFOUND;
112 else if ((depth == 1)
113 && _fdt_nodename_eq(fdt, offset, name, namelen))
114 return offset;
115 }
116
117 if (offset < 0)
118 return offset; /* error */
119 else
120 return -FDT_ERR_NOTFOUND;
121}
122
123int fdt_subnode_offset(const void *fdt, int parentoffset,
124 const char *name)
125{
126 return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
127}
128
129int fdt_path_offset(const void *fdt, const char *path)
130{
131 const char *end = path + strlen(path);
132 const char *p = path;
133 int offset = 0;
134
135 FDT_CHECK_HEADER(fdt);
136
137 if (*path != '/')
138 return -FDT_ERR_BADPATH;
139
140 while (*p) {
141 const char *q;
142
143 while (*p == '/')
144 p++;
145 if (! *p)
146 return offset;
147 q = strchr(p, '/');
148 if (! q)
149 q = end;
150
151 offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
152 if (offset < 0)
153 return offset;
154
155 p = q;
156 }
157
158 return offset;
159}
160
161const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
162{
163 const struct fdt_node_header *nh = _fdt_offset_ptr(fdt, nodeoffset);
164 int err;
165
166 if (((err = fdt_check_header(fdt)) != 0)
167 || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
168 goto fail;
169
170 if (len)
171 *len = strlen(nh->name);
172
173 return nh->name;
174
175 fail:
176 if (len)
177 *len = err;
178 return NULL;
179}
180
181const struct fdt_property *fdt_get_property(const void *fdt,
182 int nodeoffset,
183 const char *name, int *lenp)
184{
185 uint32_t tag;
186 const struct fdt_property *prop;
187 int namestroff;
188 int offset, nextoffset;
189 int err;
190
191 if (((err = fdt_check_header(fdt)) != 0)
192 || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
193 goto fail;
194
195 nextoffset = err;
196 do {
197 offset = nextoffset;
198
199 tag = fdt_next_tag(fdt, offset, &nextoffset);
200 switch (tag) {
201 case FDT_END:
202 err = -FDT_ERR_TRUNCATED;
203 goto fail;
204
205 case FDT_BEGIN_NODE:
206 case FDT_END_NODE:
207 case FDT_NOP:
208 break;
209
210 case FDT_PROP:
211 err = -FDT_ERR_BADSTRUCTURE;
212 prop = fdt_offset_ptr(fdt, offset, sizeof(*prop));
213 if (! prop)
214 goto fail;
215 namestroff = fdt32_to_cpu(prop->nameoff);
216 if (strcmp(fdt_string(fdt, namestroff), name) == 0) {
217 /* Found it! */
218 int len = fdt32_to_cpu(prop->len);
219 prop = fdt_offset_ptr(fdt, offset,
220 sizeof(*prop)+len);
221 if (! prop)
222 goto fail;
223
224 if (lenp)
225 *lenp = len;
226
227 return prop;
228 }
229 break;
230
231 default:
232 err = -FDT_ERR_BADSTRUCTURE;
233 goto fail;
234 }
235 } while ((tag != FDT_BEGIN_NODE) && (tag != FDT_END_NODE));
236
237 err = -FDT_ERR_NOTFOUND;
238 fail:
239 if (lenp)
240 *lenp = err;
241 return NULL;
242}
243
244const void *fdt_getprop(const void *fdt, int nodeoffset,
245 const char *name, int *lenp)
246{
247 const struct fdt_property *prop;
248
249 prop = fdt_get_property(fdt, nodeoffset, name, lenp);
250 if (! prop)
251 return NULL;
252
253 return prop->data;
254}
255
256uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
257{
258 const uint32_t *php;
259 int len;
260
261 php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
262 if (!php || (len != sizeof(*php)))
263 return 0;
264
265 return fdt32_to_cpu(*php);
266}
267
268int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
269{
270 int pdepth = 0, p = 0;
271 int offset, depth, namelen;
272 const char *name;
273
274 FDT_CHECK_HEADER(fdt);
275
276 if (buflen < 2)
277 return -FDT_ERR_NOSPACE;
278
279 for (offset = 0, depth = 0;
280 (offset >= 0) && (offset <= nodeoffset);
281 offset = fdt_next_node(fdt, offset, &depth)) {
282 if (pdepth < depth)
283 continue; /* overflowed buffer */
284
285 while (pdepth > depth) {
286 do {
287 p--;
288 } while (buf[p-1] != '/');
289 pdepth--;
290 }
291
292 name = fdt_get_name(fdt, offset, &namelen);
293 if (!name)
294 return namelen;
295 if ((p + namelen + 1) <= buflen) {
296 memcpy(buf + p, name, namelen);
297 p += namelen;
298 buf[p++] = '/';
299 pdepth++;
300 }
301
302 if (offset == nodeoffset) {
303 if (pdepth < (depth + 1))
304 return -FDT_ERR_NOSPACE;
305
306 if (p > 1) /* special case so that root path is "/", not "" */
307 p--;
308 buf[p] = '\0';
309 return p;
310 }
311 }
312
313 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
314 return -FDT_ERR_BADOFFSET;
315 else if (offset == -FDT_ERR_BADOFFSET)
316 return -FDT_ERR_BADSTRUCTURE;
317
318 return offset; /* error from fdt_next_node() */
319}
320
321int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
322 int supernodedepth, int *nodedepth)
323{
324 int offset, depth;
325 int supernodeoffset = -FDT_ERR_INTERNAL;
326
327 FDT_CHECK_HEADER(fdt);
328
329 if (supernodedepth < 0)
330 return -FDT_ERR_NOTFOUND;
331
332 for (offset = 0, depth = 0;
333 (offset >= 0) && (offset <= nodeoffset);
334 offset = fdt_next_node(fdt, offset, &depth)) {
335 if (depth == supernodedepth)
336 supernodeoffset = offset;
337
338 if (offset == nodeoffset) {
339 if (nodedepth)
340 *nodedepth = depth;
341
342 if (supernodedepth > depth)
343 return -FDT_ERR_NOTFOUND;
344 else
345 return supernodeoffset;
346 }
347 }
348
349 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
350 return -FDT_ERR_BADOFFSET;
351 else if (offset == -FDT_ERR_BADOFFSET)
352 return -FDT_ERR_BADSTRUCTURE;
353
354 return offset; /* error from fdt_next_node() */
355}
356
357int fdt_node_depth(const void *fdt, int nodeoffset)
358{
359 int nodedepth;
360 int err;
361
362 err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
363 if (err)
364 return (err < 0) ? err : -FDT_ERR_INTERNAL;
365 return nodedepth;
366}
367
368int fdt_parent_offset(const void *fdt, int nodeoffset)
369{
370 int nodedepth = fdt_node_depth(fdt, nodeoffset);
371
372 if (nodedepth < 0)
373 return nodedepth;
374 return fdt_supernode_atdepth_offset(fdt, nodeoffset,
375 nodedepth - 1, NULL);
376}
377
378int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
379 const char *propname,
380 const void *propval, int proplen)
381{
382 int offset;
383 const void *val;
384 int len;
385
386 FDT_CHECK_HEADER(fdt);
387
388 /* FIXME: The algorithm here is pretty horrible: we scan each
389 * property of a node in fdt_getprop(), then if that didn't
390 * find what we want, we scan over them again making our way
391 * to the next node. Still it's the easiest to implement
392 * approach; performance can come later. */
393 for (offset = fdt_next_node(fdt, startoffset, NULL);
394 offset >= 0;
395 offset = fdt_next_node(fdt, offset, NULL)) {
396 val = fdt_getprop(fdt, offset, propname, &len);
397 if (val && (len == proplen)
398 && (memcmp(val, propval, len) == 0))
399 return offset;
400 }
401
402 return offset; /* error from fdt_next_node() */
403}
404
405int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
406{
407 if ((phandle == 0) || (phandle == -1))
408 return -FDT_ERR_BADPHANDLE;
409 phandle = cpu_to_fdt32(phandle);
410 return fdt_node_offset_by_prop_value(fdt, -1, "linux,phandle",
411 &phandle, sizeof(phandle));
412}
413
414static int _stringlist_contains(const char *strlist, int listlen, const char *str)
415{
416 int len = strlen(str);
417 const char *p;
418
419 while (listlen >= len) {
420 if (memcmp(str, strlist, len+1) == 0)
421 return 1;
422 p = memchr(strlist, '\0', listlen);
423 if (!p)
424 return 0; /* malformed strlist.. */
425 listlen -= (p-strlist) + 1;
426 strlist = p + 1;
427 }
428 return 0;
429}
430
431int fdt_node_check_compatible(const void *fdt, int nodeoffset,
432 const char *compatible)
433{
434 const void *prop;
435 int len;
436
437 prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
438 if (!prop)
439 return len;
440 if (_stringlist_contains(prop, len, compatible))
441 return 0;
442 else
443 return 1;
444}
445
446int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
447 const char *compatible)
448{
449 int offset, err;
450
451 FDT_CHECK_HEADER(fdt);
452
453 /* FIXME: The algorithm here is pretty horrible: we scan each
454 * property of a node in fdt_node_check_compatible(), then if
455 * that didn't find what we want, we scan over them again
456 * making our way to the next node. Still it's the easiest to
457 * implement approach; performance can come later. */
458 for (offset = fdt_next_node(fdt, startoffset, NULL);
459 offset >= 0;
460 offset = fdt_next_node(fdt, offset, NULL)) {
461 err = fdt_node_check_compatible(fdt, offset, compatible);
462 if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
463 return err;
464 else if (err == 0)
465 return offset;
466 }
467
468 return offset; /* error from fdt_next_node() */
469}
1/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 *
5 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
7 *
8 * a) This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21 * MA 02110-1301 USA
22 *
23 * Alternatively,
24 *
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
27 * conditions are met:
28 *
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer.
32 * 2. Redistributions in binary form must reproduce the above
33 * copyright notice, this list of conditions and the following
34 * disclaimer in the documentation and/or other materials
35 * provided with the distribution.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50 */
51#include "libfdt_env.h"
52
53#include <fdt.h>
54#include <libfdt.h>
55
56#include "libfdt_internal.h"
57
58static int _fdt_nodename_eq(const void *fdt, int offset,
59 const char *s, int len)
60{
61 const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
62
63 if (! p)
64 /* short match */
65 return 0;
66
67 if (memcmp(p, s, len) != 0)
68 return 0;
69
70 if (p[len] == '\0')
71 return 1;
72 else if (!memchr(s, '@', len) && (p[len] == '@'))
73 return 1;
74 else
75 return 0;
76}
77
78const char *fdt_string(const void *fdt, int stroffset)
79{
80 return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
81}
82
83static int _fdt_string_eq(const void *fdt, int stroffset,
84 const char *s, int len)
85{
86 const char *p = fdt_string(fdt, stroffset);
87
88 return (strlen(p) == len) && (memcmp(p, s, len) == 0);
89}
90
91int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
92{
93 FDT_CHECK_HEADER(fdt);
94 *address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
95 *size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
96 return 0;
97}
98
99int fdt_num_mem_rsv(const void *fdt)
100{
101 int i = 0;
102
103 while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
104 i++;
105 return i;
106}
107
108static int _nextprop(const void *fdt, int offset)
109{
110 uint32_t tag;
111 int nextoffset;
112
113 do {
114 tag = fdt_next_tag(fdt, offset, &nextoffset);
115
116 switch (tag) {
117 case FDT_END:
118 if (nextoffset >= 0)
119 return -FDT_ERR_BADSTRUCTURE;
120 else
121 return nextoffset;
122
123 case FDT_PROP:
124 return offset;
125 }
126 offset = nextoffset;
127 } while (tag == FDT_NOP);
128
129 return -FDT_ERR_NOTFOUND;
130}
131
132int fdt_subnode_offset_namelen(const void *fdt, int offset,
133 const char *name, int namelen)
134{
135 int depth;
136
137 FDT_CHECK_HEADER(fdt);
138
139 for (depth = 0;
140 (offset >= 0) && (depth >= 0);
141 offset = fdt_next_node(fdt, offset, &depth))
142 if ((depth == 1)
143 && _fdt_nodename_eq(fdt, offset, name, namelen))
144 return offset;
145
146 if (depth < 0)
147 return -FDT_ERR_NOTFOUND;
148 return offset; /* error */
149}
150
151int fdt_subnode_offset(const void *fdt, int parentoffset,
152 const char *name)
153{
154 return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
155}
156
157int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen)
158{
159 const char *end = path + namelen;
160 const char *p = path;
161 int offset = 0;
162
163 FDT_CHECK_HEADER(fdt);
164
165 /* see if we have an alias */
166 if (*path != '/') {
167 const char *q = memchr(path, '/', end - p);
168
169 if (!q)
170 q = end;
171
172 p = fdt_get_alias_namelen(fdt, p, q - p);
173 if (!p)
174 return -FDT_ERR_BADPATH;
175 offset = fdt_path_offset(fdt, p);
176
177 p = q;
178 }
179
180 while (p < end) {
181 const char *q;
182
183 while (*p == '/') {
184 p++;
185 if (p == end)
186 return offset;
187 }
188 q = memchr(p, '/', end - p);
189 if (! q)
190 q = end;
191
192 offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
193 if (offset < 0)
194 return offset;
195
196 p = q;
197 }
198
199 return offset;
200}
201
202int fdt_path_offset(const void *fdt, const char *path)
203{
204 return fdt_path_offset_namelen(fdt, path, strlen(path));
205}
206
207const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
208{
209 const struct fdt_node_header *nh = _fdt_offset_ptr(fdt, nodeoffset);
210 int err;
211
212 if (((err = fdt_check_header(fdt)) != 0)
213 || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
214 goto fail;
215
216 if (len)
217 *len = strlen(nh->name);
218
219 return nh->name;
220
221 fail:
222 if (len)
223 *len = err;
224 return NULL;
225}
226
227int fdt_first_property_offset(const void *fdt, int nodeoffset)
228{
229 int offset;
230
231 if ((offset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
232 return offset;
233
234 return _nextprop(fdt, offset);
235}
236
237int fdt_next_property_offset(const void *fdt, int offset)
238{
239 if ((offset = _fdt_check_prop_offset(fdt, offset)) < 0)
240 return offset;
241
242 return _nextprop(fdt, offset);
243}
244
245const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
246 int offset,
247 int *lenp)
248{
249 int err;
250 const struct fdt_property *prop;
251
252 if ((err = _fdt_check_prop_offset(fdt, offset)) < 0) {
253 if (lenp)
254 *lenp = err;
255 return NULL;
256 }
257
258 prop = _fdt_offset_ptr(fdt, offset);
259
260 if (lenp)
261 *lenp = fdt32_to_cpu(prop->len);
262
263 return prop;
264}
265
266const struct fdt_property *fdt_get_property_namelen(const void *fdt,
267 int offset,
268 const char *name,
269 int namelen, int *lenp)
270{
271 for (offset = fdt_first_property_offset(fdt, offset);
272 (offset >= 0);
273 (offset = fdt_next_property_offset(fdt, offset))) {
274 const struct fdt_property *prop;
275
276 if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
277 offset = -FDT_ERR_INTERNAL;
278 break;
279 }
280 if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
281 name, namelen))
282 return prop;
283 }
284
285 if (lenp)
286 *lenp = offset;
287 return NULL;
288}
289
290const struct fdt_property *fdt_get_property(const void *fdt,
291 int nodeoffset,
292 const char *name, int *lenp)
293{
294 return fdt_get_property_namelen(fdt, nodeoffset, name,
295 strlen(name), lenp);
296}
297
298const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
299 const char *name, int namelen, int *lenp)
300{
301 const struct fdt_property *prop;
302
303 prop = fdt_get_property_namelen(fdt, nodeoffset, name, namelen, lenp);
304 if (! prop)
305 return NULL;
306
307 return prop->data;
308}
309
310const void *fdt_getprop_by_offset(const void *fdt, int offset,
311 const char **namep, int *lenp)
312{
313 const struct fdt_property *prop;
314
315 prop = fdt_get_property_by_offset(fdt, offset, lenp);
316 if (!prop)
317 return NULL;
318 if (namep)
319 *namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
320 return prop->data;
321}
322
323const void *fdt_getprop(const void *fdt, int nodeoffset,
324 const char *name, int *lenp)
325{
326 return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
327}
328
329uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
330{
331 const fdt32_t *php;
332 int len;
333
334 /* FIXME: This is a bit sub-optimal, since we potentially scan
335 * over all the properties twice. */
336 php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
337 if (!php || (len != sizeof(*php))) {
338 php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
339 if (!php || (len != sizeof(*php)))
340 return 0;
341 }
342
343 return fdt32_to_cpu(*php);
344}
345
346const char *fdt_get_alias_namelen(const void *fdt,
347 const char *name, int namelen)
348{
349 int aliasoffset;
350
351 aliasoffset = fdt_path_offset(fdt, "/aliases");
352 if (aliasoffset < 0)
353 return NULL;
354
355 return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
356}
357
358const char *fdt_get_alias(const void *fdt, const char *name)
359{
360 return fdt_get_alias_namelen(fdt, name, strlen(name));
361}
362
363int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
364{
365 int pdepth = 0, p = 0;
366 int offset, depth, namelen;
367 const char *name;
368
369 FDT_CHECK_HEADER(fdt);
370
371 if (buflen < 2)
372 return -FDT_ERR_NOSPACE;
373
374 for (offset = 0, depth = 0;
375 (offset >= 0) && (offset <= nodeoffset);
376 offset = fdt_next_node(fdt, offset, &depth)) {
377 while (pdepth > depth) {
378 do {
379 p--;
380 } while (buf[p-1] != '/');
381 pdepth--;
382 }
383
384 if (pdepth >= depth) {
385 name = fdt_get_name(fdt, offset, &namelen);
386 if (!name)
387 return namelen;
388 if ((p + namelen + 1) <= buflen) {
389 memcpy(buf + p, name, namelen);
390 p += namelen;
391 buf[p++] = '/';
392 pdepth++;
393 }
394 }
395
396 if (offset == nodeoffset) {
397 if (pdepth < (depth + 1))
398 return -FDT_ERR_NOSPACE;
399
400 if (p > 1) /* special case so that root path is "/", not "" */
401 p--;
402 buf[p] = '\0';
403 return 0;
404 }
405 }
406
407 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
408 return -FDT_ERR_BADOFFSET;
409 else if (offset == -FDT_ERR_BADOFFSET)
410 return -FDT_ERR_BADSTRUCTURE;
411
412 return offset; /* error from fdt_next_node() */
413}
414
415int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
416 int supernodedepth, int *nodedepth)
417{
418 int offset, depth;
419 int supernodeoffset = -FDT_ERR_INTERNAL;
420
421 FDT_CHECK_HEADER(fdt);
422
423 if (supernodedepth < 0)
424 return -FDT_ERR_NOTFOUND;
425
426 for (offset = 0, depth = 0;
427 (offset >= 0) && (offset <= nodeoffset);
428 offset = fdt_next_node(fdt, offset, &depth)) {
429 if (depth == supernodedepth)
430 supernodeoffset = offset;
431
432 if (offset == nodeoffset) {
433 if (nodedepth)
434 *nodedepth = depth;
435
436 if (supernodedepth > depth)
437 return -FDT_ERR_NOTFOUND;
438 else
439 return supernodeoffset;
440 }
441 }
442
443 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
444 return -FDT_ERR_BADOFFSET;
445 else if (offset == -FDT_ERR_BADOFFSET)
446 return -FDT_ERR_BADSTRUCTURE;
447
448 return offset; /* error from fdt_next_node() */
449}
450
451int fdt_node_depth(const void *fdt, int nodeoffset)
452{
453 int nodedepth;
454 int err;
455
456 err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
457 if (err)
458 return (err < 0) ? err : -FDT_ERR_INTERNAL;
459 return nodedepth;
460}
461
462int fdt_parent_offset(const void *fdt, int nodeoffset)
463{
464 int nodedepth = fdt_node_depth(fdt, nodeoffset);
465
466 if (nodedepth < 0)
467 return nodedepth;
468 return fdt_supernode_atdepth_offset(fdt, nodeoffset,
469 nodedepth - 1, NULL);
470}
471
472int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
473 const char *propname,
474 const void *propval, int proplen)
475{
476 int offset;
477 const void *val;
478 int len;
479
480 FDT_CHECK_HEADER(fdt);
481
482 /* FIXME: The algorithm here is pretty horrible: we scan each
483 * property of a node in fdt_getprop(), then if that didn't
484 * find what we want, we scan over them again making our way
485 * to the next node. Still it's the easiest to implement
486 * approach; performance can come later. */
487 for (offset = fdt_next_node(fdt, startoffset, NULL);
488 offset >= 0;
489 offset = fdt_next_node(fdt, offset, NULL)) {
490 val = fdt_getprop(fdt, offset, propname, &len);
491 if (val && (len == proplen)
492 && (memcmp(val, propval, len) == 0))
493 return offset;
494 }
495
496 return offset; /* error from fdt_next_node() */
497}
498
499int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
500{
501 int offset;
502
503 if ((phandle == 0) || (phandle == -1))
504 return -FDT_ERR_BADPHANDLE;
505
506 FDT_CHECK_HEADER(fdt);
507
508 /* FIXME: The algorithm here is pretty horrible: we
509 * potentially scan each property of a node in
510 * fdt_get_phandle(), then if that didn't find what
511 * we want, we scan over them again making our way to the next
512 * node. Still it's the easiest to implement approach;
513 * performance can come later. */
514 for (offset = fdt_next_node(fdt, -1, NULL);
515 offset >= 0;
516 offset = fdt_next_node(fdt, offset, NULL)) {
517 if (fdt_get_phandle(fdt, offset) == phandle)
518 return offset;
519 }
520
521 return offset; /* error from fdt_next_node() */
522}
523
524int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
525{
526 int len = strlen(str);
527 const char *p;
528
529 while (listlen >= len) {
530 if (memcmp(str, strlist, len+1) == 0)
531 return 1;
532 p = memchr(strlist, '\0', listlen);
533 if (!p)
534 return 0; /* malformed strlist.. */
535 listlen -= (p-strlist) + 1;
536 strlist = p + 1;
537 }
538 return 0;
539}
540
541int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property)
542{
543 const char *list, *end;
544 int length, count = 0;
545
546 list = fdt_getprop(fdt, nodeoffset, property, &length);
547 if (!list)
548 return -length;
549
550 end = list + length;
551
552 while (list < end) {
553 length = strnlen(list, end - list) + 1;
554
555 /* Abort if the last string isn't properly NUL-terminated. */
556 if (list + length > end)
557 return -FDT_ERR_BADVALUE;
558
559 list += length;
560 count++;
561 }
562
563 return count;
564}
565
566int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
567 const char *string)
568{
569 int length, len, idx = 0;
570 const char *list, *end;
571
572 list = fdt_getprop(fdt, nodeoffset, property, &length);
573 if (!list)
574 return -length;
575
576 len = strlen(string) + 1;
577 end = list + length;
578
579 while (list < end) {
580 length = strnlen(list, end - list) + 1;
581
582 /* Abort if the last string isn't properly NUL-terminated. */
583 if (list + length > end)
584 return -FDT_ERR_BADVALUE;
585
586 if (length == len && memcmp(list, string, length) == 0)
587 return idx;
588
589 list += length;
590 idx++;
591 }
592
593 return -FDT_ERR_NOTFOUND;
594}
595
596const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
597 const char *property, int idx,
598 int *lenp)
599{
600 const char *list, *end;
601 int length;
602
603 list = fdt_getprop(fdt, nodeoffset, property, &length);
604 if (!list) {
605 if (lenp)
606 *lenp = length;
607
608 return NULL;
609 }
610
611 end = list + length;
612
613 while (list < end) {
614 length = strnlen(list, end - list) + 1;
615
616 /* Abort if the last string isn't properly NUL-terminated. */
617 if (list + length > end) {
618 if (lenp)
619 *lenp = -FDT_ERR_BADVALUE;
620
621 return NULL;
622 }
623
624 if (idx == 0) {
625 if (lenp)
626 *lenp = length - 1;
627
628 return list;
629 }
630
631 list += length;
632 idx--;
633 }
634
635 if (lenp)
636 *lenp = -FDT_ERR_NOTFOUND;
637
638 return NULL;
639}
640
641int fdt_node_check_compatible(const void *fdt, int nodeoffset,
642 const char *compatible)
643{
644 const void *prop;
645 int len;
646
647 prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
648 if (!prop)
649 return len;
650 if (fdt_stringlist_contains(prop, len, compatible))
651 return 0;
652 else
653 return 1;
654}
655
656int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
657 const char *compatible)
658{
659 int offset, err;
660
661 FDT_CHECK_HEADER(fdt);
662
663 /* FIXME: The algorithm here is pretty horrible: we scan each
664 * property of a node in fdt_node_check_compatible(), then if
665 * that didn't find what we want, we scan over them again
666 * making our way to the next node. Still it's the easiest to
667 * implement approach; performance can come later. */
668 for (offset = fdt_next_node(fdt, startoffset, NULL);
669 offset >= 0;
670 offset = fdt_next_node(fdt, offset, NULL)) {
671 err = fdt_node_check_compatible(fdt, offset, compatible);
672 if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
673 return err;
674 else if (err == 0)
675 return offset;
676 }
677
678 return offset; /* error from fdt_next_node() */
679}