2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
5 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
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.
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.
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,
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
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.
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.
51 #include "libfdt_env.h"
60 #include "libfdt_internal.h"
62 static int _fdt_nodename_eq(const void *fdt, int offset,
63 const char *s, int len)
65 const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
71 if (memcmp(p, s, len) != 0)
76 else if (!memchr(s, '@', len) && (p[len] == '@'))
82 const char *fdt_string(const void *fdt, int stroffset)
84 return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
87 static int _fdt_string_eq(const void *fdt, int stroffset,
88 const char *s, int len)
90 const char *p = fdt_string(fdt, stroffset);
92 return (strlen(p) == len) && (memcmp(p, s, len) == 0);
95 int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
97 FDT_CHECK_HEADER(fdt);
98 *address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
99 *size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
103 int fdt_num_mem_rsv(const void *fdt)
107 while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
112 static int _nextprop(const void *fdt, int offset)
118 tag = fdt_next_tag(fdt, offset, &nextoffset);
123 return -FDT_ERR_BADSTRUCTURE;
131 } while (tag == FDT_NOP);
133 return -FDT_ERR_NOTFOUND;
136 int fdt_subnode_offset_namelen(const void *fdt, int offset,
137 const char *name, int namelen)
141 FDT_CHECK_HEADER(fdt);
144 (offset >= 0) && (depth >= 0);
145 offset = fdt_next_node(fdt, offset, &depth))
147 && _fdt_nodename_eq(fdt, offset, name, namelen))
151 return -FDT_ERR_NOTFOUND;
152 return offset; /* error */
155 int fdt_subnode_offset(const void *fdt, int parentoffset,
158 return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
161 int fdt_path_offset(const void *fdt, const char *path)
163 const char *end = path + strlen(path);
164 const char *p = path;
167 FDT_CHECK_HEADER(fdt);
169 /* see if we have an alias */
171 const char *q = strchr(path, '/');
176 p = fdt_get_alias_namelen(fdt, p, q - p);
178 return -FDT_ERR_BADPATH;
179 offset = fdt_path_offset(fdt, p);
195 offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
205 const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
207 const struct fdt_node_header *nh = _fdt_offset_ptr(fdt, nodeoffset);
210 if (((err = fdt_check_header(fdt)) != 0)
211 || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
215 *len = strlen(nh->name);
225 int fdt_first_property_offset(const void *fdt, int nodeoffset)
229 if ((offset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
232 return _nextprop(fdt, offset);
235 int fdt_next_property_offset(const void *fdt, int offset)
237 if ((offset = _fdt_check_prop_offset(fdt, offset)) < 0)
240 return _nextprop(fdt, offset);
243 const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
248 const struct fdt_property *prop;
250 if ((err = _fdt_check_prop_offset(fdt, offset)) < 0) {
256 prop = _fdt_offset_ptr(fdt, offset);
259 *lenp = fdt32_to_cpu(prop->len);
264 const struct fdt_property *fdt_get_property_namelen(const void *fdt,
267 int namelen, int *lenp)
269 for (offset = fdt_first_property_offset(fdt, offset);
271 (offset = fdt_next_property_offset(fdt, offset))) {
272 const struct fdt_property *prop;
274 if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
275 offset = -FDT_ERR_INTERNAL;
278 if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
288 const struct fdt_property *fdt_get_property(const void *fdt,
290 const char *name, int *lenp)
292 return fdt_get_property_namelen(fdt, nodeoffset, name,
296 const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
297 const char *name, int namelen, int *lenp)
299 const struct fdt_property *prop;
301 prop = fdt_get_property_namelen(fdt, nodeoffset, name, namelen, lenp);
308 const void *fdt_getprop_by_offset(const void *fdt, int offset,
309 const char **namep, int *lenp)
311 const struct fdt_property *prop;
313 prop = fdt_get_property_by_offset(fdt, offset, lenp);
317 *namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
321 const void *fdt_getprop(const void *fdt, int nodeoffset,
322 const char *name, int *lenp)
324 return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
327 uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
332 /* FIXME: This is a bit sub-optimal, since we potentially scan
333 * over all the properties twice. */
334 php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
335 if (!php || (len != sizeof(*php))) {
336 php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
337 if (!php || (len != sizeof(*php)))
341 return fdt32_to_cpu(*php);
344 const char *fdt_get_alias_namelen(const void *fdt,
345 const char *name, int namelen)
349 aliasoffset = fdt_path_offset(fdt, "/aliases");
353 return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
356 const char *fdt_get_alias(const void *fdt, const char *name)
358 return fdt_get_alias_namelen(fdt, name, strlen(name));
361 int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
363 int pdepth = 0, p = 0;
364 int offset, depth, namelen;
367 FDT_CHECK_HEADER(fdt);
370 return -FDT_ERR_NOSPACE;
372 for (offset = 0, depth = 0;
373 (offset >= 0) && (offset <= nodeoffset);
374 offset = fdt_next_node(fdt, offset, &depth)) {
375 while (pdepth > depth) {
378 } while (buf[p-1] != '/');
382 if (pdepth >= depth) {
383 name = fdt_get_name(fdt, offset, &namelen);
386 if ((p + namelen + 1) <= buflen) {
387 memcpy(buf + p, name, namelen);
394 if (offset == nodeoffset) {
395 if (pdepth < (depth + 1))
396 return -FDT_ERR_NOSPACE;
398 if (p > 1) /* special case so that root path is "/", not "" */
405 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
406 return -FDT_ERR_BADOFFSET;
407 else if (offset == -FDT_ERR_BADOFFSET)
408 return -FDT_ERR_BADSTRUCTURE;
410 return offset; /* error from fdt_next_node() */
413 int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
414 int supernodedepth, int *nodedepth)
417 int supernodeoffset = -FDT_ERR_INTERNAL;
419 FDT_CHECK_HEADER(fdt);
421 if (supernodedepth < 0)
422 return -FDT_ERR_NOTFOUND;
424 for (offset = 0, depth = 0;
425 (offset >= 0) && (offset <= nodeoffset);
426 offset = fdt_next_node(fdt, offset, &depth)) {
427 if (depth == supernodedepth)
428 supernodeoffset = offset;
430 if (offset == nodeoffset) {
434 if (supernodedepth > depth)
435 return -FDT_ERR_NOTFOUND;
437 return supernodeoffset;
441 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
442 return -FDT_ERR_BADOFFSET;
443 else if (offset == -FDT_ERR_BADOFFSET)
444 return -FDT_ERR_BADSTRUCTURE;
446 return offset; /* error from fdt_next_node() */
449 int fdt_node_depth(const void *fdt, int nodeoffset)
454 err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
456 return (err < 0) ? err : -FDT_ERR_INTERNAL;
460 int fdt_parent_offset(const void *fdt, int nodeoffset)
462 int nodedepth = fdt_node_depth(fdt, nodeoffset);
466 return fdt_supernode_atdepth_offset(fdt, nodeoffset,
467 nodedepth - 1, NULL);
470 int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
471 const char *propname,
472 const void *propval, int proplen)
478 FDT_CHECK_HEADER(fdt);
480 /* FIXME: The algorithm here is pretty horrible: we scan each
481 * property of a node in fdt_getprop(), then if that didn't
482 * find what we want, we scan over them again making our way
483 * to the next node. Still it's the easiest to implement
484 * approach; performance can come later. */
485 for (offset = fdt_next_node(fdt, startoffset, NULL);
487 offset = fdt_next_node(fdt, offset, NULL)) {
488 val = fdt_getprop(fdt, offset, propname, &len);
489 if (val && (len == proplen)
490 && (memcmp(val, propval, len) == 0))
494 return offset; /* error from fdt_next_node() */
497 int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
501 if ((phandle == 0) || (phandle == -1))
502 return -FDT_ERR_BADPHANDLE;
504 FDT_CHECK_HEADER(fdt);
506 /* FIXME: The algorithm here is pretty horrible: we
507 * potentially scan each property of a node in
508 * fdt_get_phandle(), then if that didn't find what
509 * we want, we scan over them again making our way to the next
510 * node. Still it's the easiest to implement approach;
511 * performance can come later. */
512 for (offset = fdt_next_node(fdt, -1, NULL);
514 offset = fdt_next_node(fdt, offset, NULL)) {
515 if (fdt_get_phandle(fdt, offset) == phandle)
519 return offset; /* error from fdt_next_node() */
522 static int _fdt_stringlist_contains(const char *strlist, int listlen,
525 int len = strlen(str);
528 while (listlen >= len) {
529 if (memcmp(str, strlist, len+1) == 0)
531 p = memchr(strlist, '\0', listlen);
533 return 0; /* malformed strlist.. */
534 listlen -= (p-strlist) + 1;
540 int fdt_node_check_compatible(const void *fdt, int nodeoffset,
541 const char *compatible)
546 prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
549 if (_fdt_stringlist_contains(prop, len, compatible))
555 int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
556 const char *compatible)
560 FDT_CHECK_HEADER(fdt);
562 /* FIXME: The algorithm here is pretty horrible: we scan each
563 * property of a node in fdt_node_check_compatible(), then if
564 * that didn't find what we want, we scan over them again
565 * making our way to the next node. Still it's the easiest to
566 * implement approach; performance can come later. */
567 for (offset = fdt_next_node(fdt, startoffset, NULL);
569 offset = fdt_next_node(fdt, offset, NULL)) {
570 err = fdt_node_check_compatible(fdt, offset, compatible);
571 if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
577 return offset; /* error from fdt_next_node() */