blob: 17584da25760b0ecb4b821335a0e4df61977b85f [file] [log] [blame]
Rob Herring12869ec2019-06-21 08:18:32 -06001// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
David Gibson1cade992007-12-10 14:28:39 +11002/*
3 * libfdt - Flat Device Tree manipulation
4 * Copyright (C) 2006 David Gibson, IBM Corporation.
David Gibson1cade992007-12-10 14:28:39 +11005 */
6#include "libfdt_env.h"
7
8#include <fdt.h>
9#include <libfdt.h>
10
11#include "libfdt_internal.h"
12
Rob Herring9130ba82018-02-27 17:40:38 -060013static int fdt_nodename_eq_(const void *fdt, int offset,
David Gibsoned95d742008-08-07 12:24:17 +100014 const char *s, int len)
David Gibson1cade992007-12-10 14:28:39 +110015{
Rob Herring9130ba82018-02-27 17:40:38 -060016 int olen;
17 const char *p = fdt_get_name(fdt, offset, &olen);
David Gibson1cade992007-12-10 14:28:39 +110018
Rob Herring9130ba82018-02-27 17:40:38 -060019 if (!p || olen < len)
David Gibson1cade992007-12-10 14:28:39 +110020 /* short match */
21 return 0;
22
23 if (memcmp(p, s, len) != 0)
24 return 0;
25
26 if (p[len] == '\0')
27 return 1;
28 else if (!memchr(s, '@', len) && (p[len] == '@'))
29 return 1;
30 else
31 return 0;
32}
33
Rob Herringf8589272018-09-13 08:59:25 -050034const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
35{
Rob Herringd047cd82020-03-13 08:56:58 -050036 int32_t totalsize;
37 uint32_t absoffset;
Rob Herringf8589272018-09-13 08:59:25 -050038 size_t len;
39 int err;
40 const char *s, *n;
41
Rob Herringd047cd82020-03-13 08:56:58 -050042 if (can_assume(VALID_INPUT)) {
43 s = (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
44
45 if (lenp)
46 *lenp = strlen(s);
47 return s;
48 }
49 totalsize = fdt_ro_probe_(fdt);
Rob Herring0cec1142019-12-26 15:36:47 -070050 err = totalsize;
51 if (totalsize < 0)
Rob Herringf8589272018-09-13 08:59:25 -050052 goto fail;
53
54 err = -FDT_ERR_BADOFFSET;
Rob Herringd047cd82020-03-13 08:56:58 -050055 absoffset = stroffset + fdt_off_dt_strings(fdt);
Rob Herring6e9c9682020-10-12 09:58:15 -050056 if (absoffset >= (unsigned)totalsize)
Rob Herringf8589272018-09-13 08:59:25 -050057 goto fail;
Rob Herring0cec1142019-12-26 15:36:47 -070058 len = totalsize - absoffset;
Rob Herringf8589272018-09-13 08:59:25 -050059
60 if (fdt_magic(fdt) == FDT_MAGIC) {
61 if (stroffset < 0)
62 goto fail;
Rob Herringd047cd82020-03-13 08:56:58 -050063 if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
Rob Herring6e9c9682020-10-12 09:58:15 -050064 if ((unsigned)stroffset >= fdt_size_dt_strings(fdt))
Rob Herringf8589272018-09-13 08:59:25 -050065 goto fail;
66 if ((fdt_size_dt_strings(fdt) - stroffset) < len)
67 len = fdt_size_dt_strings(fdt) - stroffset;
68 }
69 } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
Rob Herring6e9c9682020-10-12 09:58:15 -050070 unsigned int sw_stroffset = -stroffset;
71
72 if ((stroffset >= 0) ||
73 (sw_stroffset > fdt_size_dt_strings(fdt)))
Rob Herringf8589272018-09-13 08:59:25 -050074 goto fail;
Rob Herring6e9c9682020-10-12 09:58:15 -050075 if (sw_stroffset < len)
76 len = sw_stroffset;
Rob Herringf8589272018-09-13 08:59:25 -050077 } else {
78 err = -FDT_ERR_INTERNAL;
79 goto fail;
80 }
81
82 s = (const char *)fdt + absoffset;
83 n = memchr(s, '\0', len);
84 if (!n) {
85 /* missing terminating NULL */
86 err = -FDT_ERR_TRUNCATED;
87 goto fail;
88 }
89
90 if (lenp)
91 *lenp = n - s;
92 return s;
93
94fail:
95 if (lenp)
96 *lenp = err;
97 return NULL;
98}
99
David Gibson1cade992007-12-10 14:28:39 +1100100const char *fdt_string(const void *fdt, int stroffset)
101{
Rob Herringf8589272018-09-13 08:59:25 -0500102 return fdt_get_string(fdt, stroffset, NULL);
David Gibson1cade992007-12-10 14:28:39 +1100103}
104
Rob Herring9130ba82018-02-27 17:40:38 -0600105static int fdt_string_eq_(const void *fdt, int stroffset,
Stephen Warrencd296722012-09-28 21:25:59 +0000106 const char *s, int len)
107{
Rob Herringf8589272018-09-13 08:59:25 -0500108 int slen;
109 const char *p = fdt_get_string(fdt, stroffset, &slen);
Stephen Warrencd296722012-09-28 21:25:59 +0000110
Rob Herringf8589272018-09-13 08:59:25 -0500111 return p && (slen == len) && (memcmp(p, s, len) == 0);
Stephen Warrencd296722012-09-28 21:25:59 +0000112}
113
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600114int fdt_find_max_phandle(const void *fdt, uint32_t *phandle)
Rob Herring6f05afc2017-01-04 10:45:20 -0600115{
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600116 uint32_t max = 0;
117 int offset = -1;
Rob Herring6f05afc2017-01-04 10:45:20 -0600118
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600119 while (true) {
120 uint32_t value;
Rob Herring6f05afc2017-01-04 10:45:20 -0600121
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600122 offset = fdt_next_node(fdt, offset, NULL);
123 if (offset < 0) {
124 if (offset == -FDT_ERR_NOTFOUND)
125 break;
Rob Herring6f05afc2017-01-04 10:45:20 -0600126
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600127 return offset;
128 }
Rob Herring6f05afc2017-01-04 10:45:20 -0600129
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600130 value = fdt_get_phandle(fdt, offset);
Rob Herring6f05afc2017-01-04 10:45:20 -0600131
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600132 if (value > max)
133 max = value;
Rob Herring6f05afc2017-01-04 10:45:20 -0600134 }
135
Rob Herring9bb9c6a2019-06-12 07:05:52 -0600136 if (phandle)
137 *phandle = max;
138
139 return 0;
140}
141
142int fdt_generate_phandle(const void *fdt, uint32_t *phandle)
143{
144 uint32_t max;
145 int err;
146
147 err = fdt_find_max_phandle(fdt, &max);
148 if (err < 0)
149 return err;
150
151 if (max == FDT_MAX_PHANDLE)
152 return -FDT_ERR_NOPHANDLES;
153
154 if (phandle)
155 *phandle = max + 1;
156
Rob Herring6f05afc2017-01-04 10:45:20 -0600157 return 0;
158}
159
Rob Herringf8589272018-09-13 08:59:25 -0500160static const struct fdt_reserve_entry *fdt_mem_rsv(const void *fdt, int n)
161{
Rob Herring6e9c9682020-10-12 09:58:15 -0500162 unsigned int offset = n * sizeof(struct fdt_reserve_entry);
163 unsigned int absoffset = fdt_off_mem_rsvmap(fdt) + offset;
Rob Herringf8589272018-09-13 08:59:25 -0500164
Rob Herringd047cd82020-03-13 08:56:58 -0500165 if (!can_assume(VALID_INPUT)) {
166 if (absoffset < fdt_off_mem_rsvmap(fdt))
167 return NULL;
168 if (absoffset > fdt_totalsize(fdt) -
169 sizeof(struct fdt_reserve_entry))
170 return NULL;
171 }
Rob Herringf8589272018-09-13 08:59:25 -0500172 return fdt_mem_rsv_(fdt, n);
173}
174
David Gibson1cade992007-12-10 14:28:39 +1100175int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
176{
Rob Herringf8589272018-09-13 08:59:25 -0500177 const struct fdt_reserve_entry *re;
178
179 FDT_RO_PROBE(fdt);
180 re = fdt_mem_rsv(fdt, n);
Rob Herringd047cd82020-03-13 08:56:58 -0500181 if (!can_assume(VALID_INPUT) && !re)
Rob Herringf8589272018-09-13 08:59:25 -0500182 return -FDT_ERR_BADOFFSET;
183
Rob Herring79edff12021-02-03 15:26:03 -0600184 *address = fdt64_ld_(&re->address);
185 *size = fdt64_ld_(&re->size);
David Gibson1cade992007-12-10 14:28:39 +1100186 return 0;
187}
188
189int fdt_num_mem_rsv(const void *fdt)
190{
Rob Herringf8589272018-09-13 08:59:25 -0500191 int i;
192 const struct fdt_reserve_entry *re;
David Gibson1cade992007-12-10 14:28:39 +1100193
Rob Herringf8589272018-09-13 08:59:25 -0500194 for (i = 0; (re = fdt_mem_rsv(fdt, i)) != NULL; i++) {
Rob Herring79edff12021-02-03 15:26:03 -0600195 if (fdt64_ld_(&re->size) == 0)
Rob Herringf8589272018-09-13 08:59:25 -0500196 return i;
197 }
198 return -FDT_ERR_TRUNCATED;
David Gibson1cade992007-12-10 14:28:39 +1100199}
200
Rob Herring9130ba82018-02-27 17:40:38 -0600201static int nextprop_(const void *fdt, int offset)
Stephen Warrencd296722012-09-28 21:25:59 +0000202{
203 uint32_t tag;
204 int nextoffset;
205
206 do {
207 tag = fdt_next_tag(fdt, offset, &nextoffset);
208
209 switch (tag) {
210 case FDT_END:
211 if (nextoffset >= 0)
212 return -FDT_ERR_BADSTRUCTURE;
213 else
214 return nextoffset;
215
216 case FDT_PROP:
217 return offset;
218 }
219 offset = nextoffset;
220 } while (tag == FDT_NOP);
221
222 return -FDT_ERR_NOTFOUND;
223}
224
David Gibsoned95d742008-08-07 12:24:17 +1000225int fdt_subnode_offset_namelen(const void *fdt, int offset,
David Gibson1cade992007-12-10 14:28:39 +1100226 const char *name, int namelen)
227{
David Gibsoned95d742008-08-07 12:24:17 +1000228 int depth;
David Gibson1cade992007-12-10 14:28:39 +1100229
Rob Herringf8589272018-09-13 08:59:25 -0500230 FDT_RO_PROBE(fdt);
David Gibson1cade992007-12-10 14:28:39 +1100231
Stephen Warrencd296722012-09-28 21:25:59 +0000232 for (depth = 0;
233 (offset >= 0) && (depth >= 0);
234 offset = fdt_next_node(fdt, offset, &depth))
235 if ((depth == 1)
Rob Herring9130ba82018-02-27 17:40:38 -0600236 && fdt_nodename_eq_(fdt, offset, name, namelen))
David Gibsoned95d742008-08-07 12:24:17 +1000237 return offset;
David Gibson1cade992007-12-10 14:28:39 +1100238
Stephen Warrencd296722012-09-28 21:25:59 +0000239 if (depth < 0)
David Gibson2dccbf42008-10-30 16:37:05 +0000240 return -FDT_ERR_NOTFOUND;
Stephen Warrencd296722012-09-28 21:25:59 +0000241 return offset; /* error */
David Gibson1cade992007-12-10 14:28:39 +1100242}
243
244int fdt_subnode_offset(const void *fdt, int parentoffset,
245 const char *name)
246{
247 return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
248}
249
Rob Herring47605972015-04-29 16:00:05 -0500250int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen)
David Gibson1cade992007-12-10 14:28:39 +1100251{
Rob Herring47605972015-04-29 16:00:05 -0500252 const char *end = path + namelen;
David Gibson1cade992007-12-10 14:28:39 +1100253 const char *p = path;
254 int offset = 0;
255
Rob Herringf8589272018-09-13 08:59:25 -0500256 FDT_RO_PROBE(fdt);
David Gibson1cade992007-12-10 14:28:39 +1100257
Stephen Warrencd296722012-09-28 21:25:59 +0000258 /* see if we have an alias */
259 if (*path != '/') {
Rob Herring47605972015-04-29 16:00:05 -0500260 const char *q = memchr(path, '/', end - p);
Stephen Warrencd296722012-09-28 21:25:59 +0000261
262 if (!q)
263 q = end;
264
265 p = fdt_get_alias_namelen(fdt, p, q - p);
266 if (!p)
267 return -FDT_ERR_BADPATH;
268 offset = fdt_path_offset(fdt, p);
269
270 p = q;
271 }
David Gibson1cade992007-12-10 14:28:39 +1100272
Rob Herring47605972015-04-29 16:00:05 -0500273 while (p < end) {
David Gibson1cade992007-12-10 14:28:39 +1100274 const char *q;
275
Rob Herring47605972015-04-29 16:00:05 -0500276 while (*p == '/') {
David Gibson1cade992007-12-10 14:28:39 +1100277 p++;
Rob Herring47605972015-04-29 16:00:05 -0500278 if (p == end)
279 return offset;
280 }
281 q = memchr(p, '/', end - p);
David Gibson1cade992007-12-10 14:28:39 +1100282 if (! q)
283 q = end;
284
285 offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
286 if (offset < 0)
287 return offset;
288
289 p = q;
290 }
291
292 return offset;
293}
294
Rob Herring47605972015-04-29 16:00:05 -0500295int fdt_path_offset(const void *fdt, const char *path)
296{
297 return fdt_path_offset_namelen(fdt, path, strlen(path));
298}
299
David Gibson1cade992007-12-10 14:28:39 +1100300const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
301{
Rob Herring9130ba82018-02-27 17:40:38 -0600302 const struct fdt_node_header *nh = fdt_offset_ptr_(fdt, nodeoffset);
303 const char *nameptr;
David Gibson1cade992007-12-10 14:28:39 +1100304 int err;
305
Rob Herring0cec1142019-12-26 15:36:47 -0700306 if (((err = fdt_ro_probe_(fdt)) < 0)
Rob Herring9130ba82018-02-27 17:40:38 -0600307 || ((err = fdt_check_node_offset_(fdt, nodeoffset)) < 0))
David Gibsoned95d742008-08-07 12:24:17 +1000308 goto fail;
David Gibson1cade992007-12-10 14:28:39 +1100309
Rob Herring9130ba82018-02-27 17:40:38 -0600310 nameptr = nh->name;
David Gibson1cade992007-12-10 14:28:39 +1100311
Rob Herringd047cd82020-03-13 08:56:58 -0500312 if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
Rob Herring9130ba82018-02-27 17:40:38 -0600313 /*
314 * For old FDT versions, match the naming conventions of V16:
315 * give only the leaf name (after all /). The actual tree
316 * contents are loosely checked.
317 */
318 const char *leaf;
319 leaf = strrchr(nameptr, '/');
320 if (leaf == NULL) {
321 err = -FDT_ERR_BADSTRUCTURE;
322 goto fail;
323 }
324 nameptr = leaf+1;
325 }
326
327 if (len)
328 *len = strlen(nameptr);
329
330 return nameptr;
David Gibson1cade992007-12-10 14:28:39 +1100331
332 fail:
333 if (len)
334 *len = err;
335 return NULL;
336}
337
Stephen Warrencd296722012-09-28 21:25:59 +0000338int fdt_first_property_offset(const void *fdt, int nodeoffset)
339{
340 int offset;
341
Rob Herring9130ba82018-02-27 17:40:38 -0600342 if ((offset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
Stephen Warrencd296722012-09-28 21:25:59 +0000343 return offset;
344
Rob Herring9130ba82018-02-27 17:40:38 -0600345 return nextprop_(fdt, offset);
Stephen Warrencd296722012-09-28 21:25:59 +0000346}
347
348int fdt_next_property_offset(const void *fdt, int offset)
349{
Rob Herring9130ba82018-02-27 17:40:38 -0600350 if ((offset = fdt_check_prop_offset_(fdt, offset)) < 0)
Stephen Warrencd296722012-09-28 21:25:59 +0000351 return offset;
352
Rob Herring9130ba82018-02-27 17:40:38 -0600353 return nextprop_(fdt, offset);
Stephen Warrencd296722012-09-28 21:25:59 +0000354}
355
Rob Herring9130ba82018-02-27 17:40:38 -0600356static const struct fdt_property *fdt_get_property_by_offset_(const void *fdt,
357 int offset,
358 int *lenp)
Stephen Warrencd296722012-09-28 21:25:59 +0000359{
360 int err;
361 const struct fdt_property *prop;
362
Rob Herringd047cd82020-03-13 08:56:58 -0500363 if (!can_assume(VALID_INPUT) &&
364 (err = fdt_check_prop_offset_(fdt, offset)) < 0) {
Stephen Warrencd296722012-09-28 21:25:59 +0000365 if (lenp)
366 *lenp = err;
367 return NULL;
368 }
369
Rob Herring9130ba82018-02-27 17:40:38 -0600370 prop = fdt_offset_ptr_(fdt, offset);
Stephen Warrencd296722012-09-28 21:25:59 +0000371
372 if (lenp)
Rob Herring79edff12021-02-03 15:26:03 -0600373 *lenp = fdt32_ld_(&prop->len);
Stephen Warrencd296722012-09-28 21:25:59 +0000374
375 return prop;
376}
377
Rob Herring9130ba82018-02-27 17:40:38 -0600378const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
379 int offset,
380 int *lenp)
381{
382 /* Prior to version 16, properties may need realignment
383 * and this API does not work. fdt_getprop_*() will, however. */
384
Rob Herringd047cd82020-03-13 08:56:58 -0500385 if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
Rob Herring9130ba82018-02-27 17:40:38 -0600386 if (lenp)
387 *lenp = -FDT_ERR_BADVERSION;
388 return NULL;
389 }
390
391 return fdt_get_property_by_offset_(fdt, offset, lenp);
392}
393
394static const struct fdt_property *fdt_get_property_namelen_(const void *fdt,
395 int offset,
396 const char *name,
397 int namelen,
398 int *lenp,
399 int *poffset)
Stephen Warrencd296722012-09-28 21:25:59 +0000400{
401 for (offset = fdt_first_property_offset(fdt, offset);
402 (offset >= 0);
403 (offset = fdt_next_property_offset(fdt, offset))) {
404 const struct fdt_property *prop;
405
Rob Herringd047cd82020-03-13 08:56:58 -0500406 prop = fdt_get_property_by_offset_(fdt, offset, lenp);
407 if (!can_assume(LIBFDT_FLAWLESS) && !prop) {
Stephen Warrencd296722012-09-28 21:25:59 +0000408 offset = -FDT_ERR_INTERNAL;
409 break;
410 }
Rob Herring79edff12021-02-03 15:26:03 -0600411 if (fdt_string_eq_(fdt, fdt32_ld_(&prop->nameoff),
Rob Herring9130ba82018-02-27 17:40:38 -0600412 name, namelen)) {
413 if (poffset)
414 *poffset = offset;
Stephen Warrencd296722012-09-28 21:25:59 +0000415 return prop;
Rob Herring9130ba82018-02-27 17:40:38 -0600416 }
Stephen Warrencd296722012-09-28 21:25:59 +0000417 }
418
419 if (lenp)
420 *lenp = offset;
421 return NULL;
422}
423
Rob Herring9130ba82018-02-27 17:40:38 -0600424
425const struct fdt_property *fdt_get_property_namelen(const void *fdt,
426 int offset,
427 const char *name,
428 int namelen, int *lenp)
429{
430 /* Prior to version 16, properties may need realignment
431 * and this API does not work. fdt_getprop_*() will, however. */
Rob Herringd047cd82020-03-13 08:56:58 -0500432 if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
Rob Herring9130ba82018-02-27 17:40:38 -0600433 if (lenp)
434 *lenp = -FDT_ERR_BADVERSION;
435 return NULL;
436 }
437
438 return fdt_get_property_namelen_(fdt, offset, name, namelen, lenp,
439 NULL);
440}
441
442
David Gibson1cade992007-12-10 14:28:39 +1100443const struct fdt_property *fdt_get_property(const void *fdt,
444 int nodeoffset,
445 const char *name, int *lenp)
446{
Stephen Warrencd296722012-09-28 21:25:59 +0000447 return fdt_get_property_namelen(fdt, nodeoffset, name,
448 strlen(name), lenp);
David Gibson1cade992007-12-10 14:28:39 +1100449}
450
Stephen Warrencd296722012-09-28 21:25:59 +0000451const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
452 const char *name, int namelen, int *lenp)
David Gibson1cade992007-12-10 14:28:39 +1100453{
Rob Herring9130ba82018-02-27 17:40:38 -0600454 int poffset;
David Gibson1cade992007-12-10 14:28:39 +1100455 const struct fdt_property *prop;
456
Rob Herring9130ba82018-02-27 17:40:38 -0600457 prop = fdt_get_property_namelen_(fdt, nodeoffset, name, namelen, lenp,
458 &poffset);
Rob Herring4201d052017-10-03 11:37:04 -0500459 if (!prop)
David Gibson1cade992007-12-10 14:28:39 +1100460 return NULL;
461
Rob Herring9130ba82018-02-27 17:40:38 -0600462 /* Handle realignment */
Rob Herringd047cd82020-03-13 08:56:58 -0500463 if (!can_assume(LATEST) && fdt_version(fdt) < 0x10 &&
Rob Herring79edff12021-02-03 15:26:03 -0600464 (poffset + sizeof(*prop)) % 8 && fdt32_ld_(&prop->len) >= 8)
Rob Herring9130ba82018-02-27 17:40:38 -0600465 return prop->data + 4;
David Gibson1cade992007-12-10 14:28:39 +1100466 return prop->data;
467}
468
Stephen Warrencd296722012-09-28 21:25:59 +0000469const void *fdt_getprop_by_offset(const void *fdt, int offset,
470 const char **namep, int *lenp)
471{
472 const struct fdt_property *prop;
473
Rob Herring9130ba82018-02-27 17:40:38 -0600474 prop = fdt_get_property_by_offset_(fdt, offset, lenp);
Stephen Warrencd296722012-09-28 21:25:59 +0000475 if (!prop)
476 return NULL;
Rob Herringf8589272018-09-13 08:59:25 -0500477 if (namep) {
478 const char *name;
479 int namelen;
Rob Herringd047cd82020-03-13 08:56:58 -0500480
481 if (!can_assume(VALID_INPUT)) {
Rob Herring79edff12021-02-03 15:26:03 -0600482 name = fdt_get_string(fdt, fdt32_ld_(&prop->nameoff),
Rob Herringd047cd82020-03-13 08:56:58 -0500483 &namelen);
484 if (!name) {
485 if (lenp)
486 *lenp = namelen;
487 return NULL;
488 }
489 *namep = name;
490 } else {
Rob Herring79edff12021-02-03 15:26:03 -0600491 *namep = fdt_string(fdt, fdt32_ld_(&prop->nameoff));
Rob Herringf8589272018-09-13 08:59:25 -0500492 }
Rob Herringf8589272018-09-13 08:59:25 -0500493 }
Rob Herring9130ba82018-02-27 17:40:38 -0600494
495 /* Handle realignment */
Rob Herringd047cd82020-03-13 08:56:58 -0500496 if (!can_assume(LATEST) && fdt_version(fdt) < 0x10 &&
Rob Herring79edff12021-02-03 15:26:03 -0600497 (offset + sizeof(*prop)) % 8 && fdt32_ld_(&prop->len) >= 8)
Rob Herring9130ba82018-02-27 17:40:38 -0600498 return prop->data + 4;
Stephen Warrencd296722012-09-28 21:25:59 +0000499 return prop->data;
500}
501
502const void *fdt_getprop(const void *fdt, int nodeoffset,
503 const char *name, int *lenp)
504{
505 return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
506}
507
David Gibson1cade992007-12-10 14:28:39 +1100508uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
509{
Rob Herring47605972015-04-29 16:00:05 -0500510 const fdt32_t *php;
David Gibson1cade992007-12-10 14:28:39 +1100511 int len;
512
Stephen Warrencd296722012-09-28 21:25:59 +0000513 /* FIXME: This is a bit sub-optimal, since we potentially scan
514 * over all the properties twice. */
515 php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
516 if (!php || (len != sizeof(*php))) {
517 php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
518 if (!php || (len != sizeof(*php)))
519 return 0;
520 }
David Gibson1cade992007-12-10 14:28:39 +1100521
Rob Herring79edff12021-02-03 15:26:03 -0600522 return fdt32_ld_(php);
David Gibson1cade992007-12-10 14:28:39 +1100523}
524
Stephen Warrencd296722012-09-28 21:25:59 +0000525const char *fdt_get_alias_namelen(const void *fdt,
526 const char *name, int namelen)
527{
528 int aliasoffset;
529
530 aliasoffset = fdt_path_offset(fdt, "/aliases");
531 if (aliasoffset < 0)
532 return NULL;
533
534 return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
535}
536
537const char *fdt_get_alias(const void *fdt, const char *name)
538{
539 return fdt_get_alias_namelen(fdt, name, strlen(name));
540}
541
David Gibson1cade992007-12-10 14:28:39 +1100542int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
543{
David Gibsoned95d742008-08-07 12:24:17 +1000544 int pdepth = 0, p = 0;
545 int offset, depth, namelen;
David Gibson1cade992007-12-10 14:28:39 +1100546 const char *name;
547
Rob Herringf8589272018-09-13 08:59:25 -0500548 FDT_RO_PROBE(fdt);
David Gibson1cade992007-12-10 14:28:39 +1100549
550 if (buflen < 2)
551 return -FDT_ERR_NOSPACE;
David Gibson1cade992007-12-10 14:28:39 +1100552
David Gibsoned95d742008-08-07 12:24:17 +1000553 for (offset = 0, depth = 0;
554 (offset >= 0) && (offset <= nodeoffset);
555 offset = fdt_next_node(fdt, offset, &depth)) {
David Gibsoned95d742008-08-07 12:24:17 +1000556 while (pdepth > depth) {
557 do {
558 p--;
559 } while (buf[p-1] != '/');
560 pdepth--;
561 }
562
Stephen Warrencd296722012-09-28 21:25:59 +0000563 if (pdepth >= depth) {
564 name = fdt_get_name(fdt, offset, &namelen);
565 if (!name)
566 return namelen;
567 if ((p + namelen + 1) <= buflen) {
568 memcpy(buf + p, name, namelen);
569 p += namelen;
570 buf[p++] = '/';
571 pdepth++;
572 }
David Gibsoned95d742008-08-07 12:24:17 +1000573 }
David Gibson1cade992007-12-10 14:28:39 +1100574
David Gibsoned95d742008-08-07 12:24:17 +1000575 if (offset == nodeoffset) {
576 if (pdepth < (depth + 1))
577 return -FDT_ERR_NOSPACE;
578
579 if (p > 1) /* special case so that root path is "/", not "" */
David Gibson1cade992007-12-10 14:28:39 +1100580 p--;
David Gibsoned95d742008-08-07 12:24:17 +1000581 buf[p] = '\0';
Stephen Warrencd296722012-09-28 21:25:59 +0000582 return 0;
David Gibson1cade992007-12-10 14:28:39 +1100583 }
584 }
585
David Gibsoned95d742008-08-07 12:24:17 +1000586 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
587 return -FDT_ERR_BADOFFSET;
588 else if (offset == -FDT_ERR_BADOFFSET)
589 return -FDT_ERR_BADSTRUCTURE;
David Gibson1cade992007-12-10 14:28:39 +1100590
David Gibsoned95d742008-08-07 12:24:17 +1000591 return offset; /* error from fdt_next_node() */
David Gibson1cade992007-12-10 14:28:39 +1100592}
593
594int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
595 int supernodedepth, int *nodedepth)
596{
David Gibsoned95d742008-08-07 12:24:17 +1000597 int offset, depth;
David Gibson1cade992007-12-10 14:28:39 +1100598 int supernodeoffset = -FDT_ERR_INTERNAL;
599
Rob Herringf8589272018-09-13 08:59:25 -0500600 FDT_RO_PROBE(fdt);
David Gibson1cade992007-12-10 14:28:39 +1100601
602 if (supernodedepth < 0)
603 return -FDT_ERR_NOTFOUND;
604
David Gibsoned95d742008-08-07 12:24:17 +1000605 for (offset = 0, depth = 0;
606 (offset >= 0) && (offset <= nodeoffset);
607 offset = fdt_next_node(fdt, offset, &depth)) {
608 if (depth == supernodedepth)
609 supernodeoffset = offset;
David Gibson1cade992007-12-10 14:28:39 +1100610
David Gibsoned95d742008-08-07 12:24:17 +1000611 if (offset == nodeoffset) {
612 if (nodedepth)
613 *nodedepth = depth;
David Gibson1cade992007-12-10 14:28:39 +1100614
David Gibsoned95d742008-08-07 12:24:17 +1000615 if (supernodedepth > depth)
616 return -FDT_ERR_NOTFOUND;
617 else
618 return supernodeoffset;
David Gibson1cade992007-12-10 14:28:39 +1100619 }
David Gibsoned95d742008-08-07 12:24:17 +1000620 }
David Gibson1cade992007-12-10 14:28:39 +1100621
Rob Herringd047cd82020-03-13 08:56:58 -0500622 if (!can_assume(VALID_INPUT)) {
623 if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
624 return -FDT_ERR_BADOFFSET;
625 else if (offset == -FDT_ERR_BADOFFSET)
626 return -FDT_ERR_BADSTRUCTURE;
627 }
David Gibson1cade992007-12-10 14:28:39 +1100628
David Gibsoned95d742008-08-07 12:24:17 +1000629 return offset; /* error from fdt_next_node() */
David Gibson1cade992007-12-10 14:28:39 +1100630}
631
632int fdt_node_depth(const void *fdt, int nodeoffset)
633{
634 int nodedepth;
635 int err;
636
637 err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
638 if (err)
Rob Herringd047cd82020-03-13 08:56:58 -0500639 return (can_assume(LIBFDT_FLAWLESS) || err < 0) ? err :
640 -FDT_ERR_INTERNAL;
David Gibson1cade992007-12-10 14:28:39 +1100641 return nodedepth;
642}
643
644int fdt_parent_offset(const void *fdt, int nodeoffset)
645{
646 int nodedepth = fdt_node_depth(fdt, nodeoffset);
647
648 if (nodedepth < 0)
649 return nodedepth;
650 return fdt_supernode_atdepth_offset(fdt, nodeoffset,
651 nodedepth - 1, NULL);
652}
653
654int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
655 const char *propname,
656 const void *propval, int proplen)
657{
David Gibsoned95d742008-08-07 12:24:17 +1000658 int offset;
David Gibson1cade992007-12-10 14:28:39 +1100659 const void *val;
660 int len;
661
Rob Herringf8589272018-09-13 08:59:25 -0500662 FDT_RO_PROBE(fdt);
David Gibson1cade992007-12-10 14:28:39 +1100663
664 /* FIXME: The algorithm here is pretty horrible: we scan each
665 * property of a node in fdt_getprop(), then if that didn't
666 * find what we want, we scan over them again making our way
667 * to the next node. Still it's the easiest to implement
668 * approach; performance can come later. */
David Gibsoned95d742008-08-07 12:24:17 +1000669 for (offset = fdt_next_node(fdt, startoffset, NULL);
670 offset >= 0;
671 offset = fdt_next_node(fdt, offset, NULL)) {
672 val = fdt_getprop(fdt, offset, propname, &len);
673 if (val && (len == proplen)
674 && (memcmp(val, propval, len) == 0))
675 return offset;
676 }
David Gibson1cade992007-12-10 14:28:39 +1100677
David Gibsoned95d742008-08-07 12:24:17 +1000678 return offset; /* error from fdt_next_node() */
David Gibson1cade992007-12-10 14:28:39 +1100679}
680
681int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
682{
Stephen Warrencd296722012-09-28 21:25:59 +0000683 int offset;
684
Rob Herring6e9c9682020-10-12 09:58:15 -0500685 if ((phandle == 0) || (phandle == ~0U))
David Gibson1cade992007-12-10 14:28:39 +1100686 return -FDT_ERR_BADPHANDLE;
Stephen Warrencd296722012-09-28 21:25:59 +0000687
Rob Herringf8589272018-09-13 08:59:25 -0500688 FDT_RO_PROBE(fdt);
Stephen Warrencd296722012-09-28 21:25:59 +0000689
690 /* FIXME: The algorithm here is pretty horrible: we
691 * potentially scan each property of a node in
692 * fdt_get_phandle(), then if that didn't find what
693 * we want, we scan over them again making our way to the next
694 * node. Still it's the easiest to implement approach;
695 * performance can come later. */
696 for (offset = fdt_next_node(fdt, -1, NULL);
697 offset >= 0;
698 offset = fdt_next_node(fdt, offset, NULL)) {
699 if (fdt_get_phandle(fdt, offset) == phandle)
700 return offset;
701 }
702
703 return offset; /* error from fdt_next_node() */
David Gibson1cade992007-12-10 14:28:39 +1100704}
705
Rob Herring47605972015-04-29 16:00:05 -0500706int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
David Gibson1cade992007-12-10 14:28:39 +1100707{
708 int len = strlen(str);
David Gibsoned95d742008-08-07 12:24:17 +1000709 const char *p;
David Gibson1cade992007-12-10 14:28:39 +1100710
711 while (listlen >= len) {
712 if (memcmp(str, strlist, len+1) == 0)
713 return 1;
714 p = memchr(strlist, '\0', listlen);
715 if (!p)
716 return 0; /* malformed strlist.. */
717 listlen -= (p-strlist) + 1;
718 strlist = p + 1;
719 }
720 return 0;
721}
722
Rob Herring91feabc2016-01-26 09:04:11 -0600723int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property)
724{
725 const char *list, *end;
726 int length, count = 0;
727
728 list = fdt_getprop(fdt, nodeoffset, property, &length);
729 if (!list)
Rob Herring6f05afc2017-01-04 10:45:20 -0600730 return length;
Rob Herring91feabc2016-01-26 09:04:11 -0600731
732 end = list + length;
733
734 while (list < end) {
735 length = strnlen(list, end - list) + 1;
736
737 /* Abort if the last string isn't properly NUL-terminated. */
738 if (list + length > end)
739 return -FDT_ERR_BADVALUE;
740
741 list += length;
742 count++;
743 }
744
745 return count;
746}
747
748int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
749 const char *string)
750{
751 int length, len, idx = 0;
752 const char *list, *end;
753
754 list = fdt_getprop(fdt, nodeoffset, property, &length);
755 if (!list)
Rob Herring6f05afc2017-01-04 10:45:20 -0600756 return length;
Rob Herring91feabc2016-01-26 09:04:11 -0600757
758 len = strlen(string) + 1;
759 end = list + length;
760
761 while (list < end) {
762 length = strnlen(list, end - list) + 1;
763
764 /* Abort if the last string isn't properly NUL-terminated. */
765 if (list + length > end)
766 return -FDT_ERR_BADVALUE;
767
768 if (length == len && memcmp(list, string, length) == 0)
769 return idx;
770
771 list += length;
772 idx++;
773 }
774
775 return -FDT_ERR_NOTFOUND;
776}
777
778const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
779 const char *property, int idx,
780 int *lenp)
781{
782 const char *list, *end;
783 int length;
784
785 list = fdt_getprop(fdt, nodeoffset, property, &length);
786 if (!list) {
787 if (lenp)
788 *lenp = length;
789
790 return NULL;
791 }
792
793 end = list + length;
794
795 while (list < end) {
796 length = strnlen(list, end - list) + 1;
797
798 /* Abort if the last string isn't properly NUL-terminated. */
799 if (list + length > end) {
800 if (lenp)
801 *lenp = -FDT_ERR_BADVALUE;
802
803 return NULL;
804 }
805
806 if (idx == 0) {
807 if (lenp)
808 *lenp = length - 1;
809
810 return list;
811 }
812
813 list += length;
814 idx--;
815 }
816
817 if (lenp)
818 *lenp = -FDT_ERR_NOTFOUND;
819
820 return NULL;
821}
822
David Gibson1cade992007-12-10 14:28:39 +1100823int fdt_node_check_compatible(const void *fdt, int nodeoffset,
824 const char *compatible)
825{
826 const void *prop;
827 int len;
828
829 prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
830 if (!prop)
831 return len;
Rob Herringb9937342016-03-04 08:56:58 -0600832
833 return !fdt_stringlist_contains(prop, len, compatible);
David Gibson1cade992007-12-10 14:28:39 +1100834}
835
836int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
837 const char *compatible)
838{
David Gibsoned95d742008-08-07 12:24:17 +1000839 int offset, err;
David Gibson1cade992007-12-10 14:28:39 +1100840
Rob Herringf8589272018-09-13 08:59:25 -0500841 FDT_RO_PROBE(fdt);
David Gibson1cade992007-12-10 14:28:39 +1100842
843 /* FIXME: The algorithm here is pretty horrible: we scan each
844 * property of a node in fdt_node_check_compatible(), then if
845 * that didn't find what we want, we scan over them again
846 * making our way to the next node. Still it's the easiest to
847 * implement approach; performance can come later. */
David Gibsoned95d742008-08-07 12:24:17 +1000848 for (offset = fdt_next_node(fdt, startoffset, NULL);
849 offset >= 0;
850 offset = fdt_next_node(fdt, offset, NULL)) {
851 err = fdt_node_check_compatible(fdt, offset, compatible);
852 if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
853 return err;
854 else if (err == 0)
855 return offset;
856 }
David Gibson1cade992007-12-10 14:28:39 +1100857
David Gibsoned95d742008-08-07 12:24:17 +1000858 return offset; /* error from fdt_next_node() */
David Gibson1cade992007-12-10 14:28:39 +1100859}