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b5220bc6 SG |
1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. | |
3 | * See file CREDITS for list of people who contributed to this | |
4 | * project. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of | |
9 | * the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
19 | * MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <common.h> | |
23 | #include <serial.h> | |
24 | #include <libfdt.h> | |
25 | #include <fdtdec.h> | |
26 | ||
e46431e1 | 27 | #include <asm/gpio.h> |
ed3ee5cd | 28 | |
b5220bc6 SG |
29 | DECLARE_GLOBAL_DATA_PTR; |
30 | ||
31 | /* | |
32 | * Here are the type we know about. One day we might allow drivers to | |
33 | * register. For now we just put them here. The COMPAT macro allows us to | |
34 | * turn this into a sparse list later, and keeps the ID with the name. | |
35 | */ | |
36 | #define COMPAT(id, name) name | |
37 | static const char * const compat_names[COMPAT_COUNT] = { | |
f88fe2de | 38 | COMPAT(UNKNOWN, "<none>"), |
87f938c9 | 39 | COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), |
96a78ac0 YL |
40 | COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"), |
41 | COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"), | |
0e35ad05 JZ |
42 | COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), |
43 | COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), | |
6642a681 | 44 | COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), |
312693c3 | 45 | COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), |
b5220bc6 SG |
46 | }; |
47 | ||
a53f4a29 SG |
48 | const char *fdtdec_get_compatible(enum fdt_compat_id id) |
49 | { | |
50 | /* We allow reading of the 'unknown' ID for testing purposes */ | |
51 | assert(id >= 0 && id < COMPAT_COUNT); | |
52 | return compat_names[id]; | |
53 | } | |
54 | ||
b5220bc6 SG |
55 | /** |
56 | * Look in the FDT for an alias with the given name and return its node. | |
57 | * | |
58 | * @param blob FDT blob | |
59 | * @param name alias name to look up | |
60 | * @return node offset if found, or an error code < 0 otherwise | |
61 | */ | |
62 | static int find_alias_node(const void *blob, const char *name) | |
63 | { | |
64 | const char *path; | |
65 | int alias_node; | |
66 | ||
67 | debug("find_alias_node: %s\n", name); | |
68 | alias_node = fdt_path_offset(blob, "/aliases"); | |
69 | if (alias_node < 0) | |
70 | return alias_node; | |
71 | path = fdt_getprop(blob, alias_node, name, NULL); | |
72 | if (!path) | |
73 | return -FDT_ERR_NOTFOUND; | |
74 | return fdt_path_offset(blob, path); | |
75 | } | |
76 | ||
77 | fdt_addr_t fdtdec_get_addr(const void *blob, int node, | |
78 | const char *prop_name) | |
79 | { | |
80 | const fdt_addr_t *cell; | |
81 | int len; | |
82 | ||
1cb2323b | 83 | debug("%s: %s: ", __func__, prop_name); |
b5220bc6 SG |
84 | cell = fdt_getprop(blob, node, prop_name, &len); |
85 | if (cell && (len == sizeof(fdt_addr_t) || | |
1cb2323b SG |
86 | len == sizeof(fdt_addr_t) * 2)) { |
87 | fdt_addr_t addr = fdt_addr_to_cpu(*cell); | |
88 | ||
89 | debug("%p\n", (void *)addr); | |
90 | return addr; | |
91 | } | |
92 | debug("(not found)\n"); | |
b5220bc6 SG |
93 | return FDT_ADDR_T_NONE; |
94 | } | |
95 | ||
96 | s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, | |
97 | s32 default_val) | |
98 | { | |
99 | const s32 *cell; | |
100 | int len; | |
101 | ||
1cb2323b | 102 | debug("%s: %s: ", __func__, prop_name); |
b5220bc6 | 103 | cell = fdt_getprop(blob, node, prop_name, &len); |
1cb2323b SG |
104 | if (cell && len >= sizeof(s32)) { |
105 | s32 val = fdt32_to_cpu(cell[0]); | |
106 | ||
107 | debug("%#x (%d)\n", val, val); | |
108 | return val; | |
109 | } | |
110 | debug("(not found)\n"); | |
b5220bc6 SG |
111 | return default_val; |
112 | } | |
113 | ||
aadef0a1 CLC |
114 | uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, |
115 | uint64_t default_val) | |
116 | { | |
117 | const uint64_t *cell64; | |
118 | int length; | |
119 | ||
120 | cell64 = fdt_getprop(blob, node, prop_name, &length); | |
121 | if (!cell64 || length < sizeof(*cell64)) | |
122 | return default_val; | |
123 | ||
124 | return fdt64_to_cpu(*cell64); | |
125 | } | |
126 | ||
f88fe2de | 127 | int fdtdec_get_is_enabled(const void *blob, int node) |
b5220bc6 SG |
128 | { |
129 | const char *cell; | |
130 | ||
f88fe2de SG |
131 | /* |
132 | * It should say "okay", so only allow that. Some fdts use "ok" but | |
133 | * this is a bug. Please fix your device tree source file. See here | |
134 | * for discussion: | |
135 | * | |
136 | * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html | |
137 | */ | |
b5220bc6 SG |
138 | cell = fdt_getprop(blob, node, "status", NULL); |
139 | if (cell) | |
f88fe2de SG |
140 | return 0 == strcmp(cell, "okay"); |
141 | return 1; | |
b5220bc6 SG |
142 | } |
143 | ||
7cde397b | 144 | enum fdt_compat_id fdtdec_lookup(const void *blob, int node) |
b5220bc6 SG |
145 | { |
146 | enum fdt_compat_id id; | |
147 | ||
148 | /* Search our drivers */ | |
149 | for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) | |
150 | if (0 == fdt_node_check_compatible(blob, node, | |
151 | compat_names[id])) | |
152 | return id; | |
153 | return COMPAT_UNKNOWN; | |
154 | } | |
155 | ||
156 | int fdtdec_next_compatible(const void *blob, int node, | |
157 | enum fdt_compat_id id) | |
158 | { | |
159 | return fdt_node_offset_by_compatible(blob, node, compat_names[id]); | |
160 | } | |
161 | ||
3ddecfc7 SG |
162 | int fdtdec_next_compatible_subnode(const void *blob, int node, |
163 | enum fdt_compat_id id, int *depthp) | |
164 | { | |
165 | do { | |
166 | node = fdt_next_node(blob, node, depthp); | |
167 | } while (*depthp > 1); | |
168 | ||
169 | /* If this is a direct subnode, and compatible, return it */ | |
170 | if (*depthp == 1 && 0 == fdt_node_check_compatible( | |
171 | blob, node, compat_names[id])) | |
172 | return node; | |
173 | ||
174 | return -FDT_ERR_NOTFOUND; | |
175 | } | |
176 | ||
b5220bc6 SG |
177 | int fdtdec_next_alias(const void *blob, const char *name, |
178 | enum fdt_compat_id id, int *upto) | |
179 | { | |
180 | #define MAX_STR_LEN 20 | |
181 | char str[MAX_STR_LEN + 20]; | |
182 | int node, err; | |
183 | ||
184 | /* snprintf() is not available */ | |
185 | assert(strlen(name) < MAX_STR_LEN); | |
186 | sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); | |
b5220bc6 SG |
187 | node = find_alias_node(blob, str); |
188 | if (node < 0) | |
189 | return node; | |
190 | err = fdt_node_check_compatible(blob, node, compat_names[id]); | |
191 | if (err < 0) | |
192 | return err; | |
f88fe2de SG |
193 | if (err) |
194 | return -FDT_ERR_NOTFOUND; | |
195 | (*upto)++; | |
196 | return node; | |
b5220bc6 SG |
197 | } |
198 | ||
a53f4a29 SG |
199 | int fdtdec_find_aliases_for_id(const void *blob, const char *name, |
200 | enum fdt_compat_id id, int *node_list, int maxcount) | |
c6782270 SG |
201 | { |
202 | memset(node_list, '\0', sizeof(*node_list) * maxcount); | |
203 | ||
204 | return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); | |
205 | } | |
206 | ||
207 | /* TODO: Can we tighten this code up a little? */ | |
208 | int fdtdec_add_aliases_for_id(const void *blob, const char *name, | |
209 | enum fdt_compat_id id, int *node_list, int maxcount) | |
a53f4a29 SG |
210 | { |
211 | int name_len = strlen(name); | |
212 | int nodes[maxcount]; | |
213 | int num_found = 0; | |
214 | int offset, node; | |
215 | int alias_node; | |
216 | int count; | |
217 | int i, j; | |
218 | ||
219 | /* find the alias node if present */ | |
220 | alias_node = fdt_path_offset(blob, "/aliases"); | |
221 | ||
222 | /* | |
223 | * start with nothing, and we can assume that the root node can't | |
224 | * match | |
225 | */ | |
226 | memset(nodes, '\0', sizeof(nodes)); | |
227 | ||
228 | /* First find all the compatible nodes */ | |
229 | for (node = count = 0; node >= 0 && count < maxcount;) { | |
230 | node = fdtdec_next_compatible(blob, node, id); | |
231 | if (node >= 0) | |
232 | nodes[count++] = node; | |
233 | } | |
234 | if (node >= 0) | |
235 | debug("%s: warning: maxcount exceeded with alias '%s'\n", | |
236 | __func__, name); | |
237 | ||
238 | /* Now find all the aliases */ | |
a53f4a29 SG |
239 | for (offset = fdt_first_property_offset(blob, alias_node); |
240 | offset > 0; | |
241 | offset = fdt_next_property_offset(blob, offset)) { | |
242 | const struct fdt_property *prop; | |
243 | const char *path; | |
244 | int number; | |
245 | int found; | |
246 | ||
247 | node = 0; | |
248 | prop = fdt_get_property_by_offset(blob, offset, NULL); | |
249 | path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); | |
250 | if (prop->len && 0 == strncmp(path, name, name_len)) | |
251 | node = fdt_path_offset(blob, prop->data); | |
252 | if (node <= 0) | |
253 | continue; | |
254 | ||
255 | /* Get the alias number */ | |
256 | number = simple_strtoul(path + name_len, NULL, 10); | |
257 | if (number < 0 || number >= maxcount) { | |
258 | debug("%s: warning: alias '%s' is out of range\n", | |
259 | __func__, path); | |
260 | continue; | |
261 | } | |
262 | ||
263 | /* Make sure the node we found is actually in our list! */ | |
264 | found = -1; | |
265 | for (j = 0; j < count; j++) | |
266 | if (nodes[j] == node) { | |
267 | found = j; | |
268 | break; | |
269 | } | |
270 | ||
271 | if (found == -1) { | |
272 | debug("%s: warning: alias '%s' points to a node " | |
273 | "'%s' that is missing or is not compatible " | |
274 | " with '%s'\n", __func__, path, | |
275 | fdt_get_name(blob, node, NULL), | |
276 | compat_names[id]); | |
277 | continue; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Add this node to our list in the right place, and mark | |
282 | * it as done. | |
283 | */ | |
284 | if (fdtdec_get_is_enabled(blob, node)) { | |
c6782270 SG |
285 | if (node_list[number]) { |
286 | debug("%s: warning: alias '%s' requires that " | |
287 | "a node be placed in the list in a " | |
288 | "position which is already filled by " | |
289 | "node '%s'\n", __func__, path, | |
290 | fdt_get_name(blob, node, NULL)); | |
291 | continue; | |
292 | } | |
a53f4a29 SG |
293 | node_list[number] = node; |
294 | if (number >= num_found) | |
295 | num_found = number + 1; | |
296 | } | |
c6782270 | 297 | nodes[found] = 0; |
a53f4a29 SG |
298 | } |
299 | ||
300 | /* Add any nodes not mentioned by an alias */ | |
301 | for (i = j = 0; i < maxcount; i++) { | |
302 | if (!node_list[i]) { | |
303 | for (; j < maxcount; j++) | |
304 | if (nodes[j] && | |
305 | fdtdec_get_is_enabled(blob, nodes[j])) | |
306 | break; | |
307 | ||
308 | /* Have we run out of nodes to add? */ | |
309 | if (j == maxcount) | |
310 | break; | |
311 | ||
312 | assert(!node_list[i]); | |
313 | node_list[i] = nodes[j++]; | |
314 | if (i >= num_found) | |
315 | num_found = i + 1; | |
316 | } | |
317 | } | |
318 | ||
319 | return num_found; | |
320 | } | |
321 | ||
9a263e55 SG |
322 | int fdtdec_check_fdt(void) |
323 | { | |
324 | /* | |
325 | * We must have an FDT, but we cannot panic() yet since the console | |
326 | * is not ready. So for now, just assert(). Boards which need an early | |
327 | * FDT (prior to console ready) will need to make their own | |
328 | * arrangements and do their own checks. | |
329 | */ | |
330 | assert(!fdtdec_prepare_fdt()); | |
331 | return 0; | |
332 | } | |
333 | ||
b5220bc6 SG |
334 | /* |
335 | * This function is a little odd in that it accesses global data. At some | |
336 | * point if the architecture board.c files merge this will make more sense. | |
337 | * Even now, it is common code. | |
338 | */ | |
9a263e55 | 339 | int fdtdec_prepare_fdt(void) |
b5220bc6 | 340 | { |
9a263e55 SG |
341 | if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) { |
342 | printf("No valid FDT found - please append one to U-Boot " | |
343 | "binary, use u-boot-dtb.bin or define " | |
344 | "CONFIG_OF_EMBED\n"); | |
345 | return -1; | |
346 | } | |
b5220bc6 SG |
347 | return 0; |
348 | } | |
d17da655 SG |
349 | |
350 | int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) | |
351 | { | |
352 | const u32 *phandle; | |
353 | int lookup; | |
354 | ||
1cb2323b | 355 | debug("%s: %s\n", __func__, prop_name); |
d17da655 SG |
356 | phandle = fdt_getprop(blob, node, prop_name, NULL); |
357 | if (!phandle) | |
358 | return -FDT_ERR_NOTFOUND; | |
359 | ||
360 | lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); | |
361 | return lookup; | |
362 | } | |
363 | ||
364 | /** | |
365 | * Look up a property in a node and check that it has a minimum length. | |
366 | * | |
367 | * @param blob FDT blob | |
368 | * @param node node to examine | |
369 | * @param prop_name name of property to find | |
370 | * @param min_len minimum property length in bytes | |
371 | * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not | |
372 | found, or -FDT_ERR_BADLAYOUT if not enough data | |
373 | * @return pointer to cell, which is only valid if err == 0 | |
374 | */ | |
375 | static const void *get_prop_check_min_len(const void *blob, int node, | |
376 | const char *prop_name, int min_len, int *err) | |
377 | { | |
378 | const void *cell; | |
379 | int len; | |
380 | ||
381 | debug("%s: %s\n", __func__, prop_name); | |
382 | cell = fdt_getprop(blob, node, prop_name, &len); | |
383 | if (!cell) | |
384 | *err = -FDT_ERR_NOTFOUND; | |
385 | else if (len < min_len) | |
386 | *err = -FDT_ERR_BADLAYOUT; | |
387 | else | |
388 | *err = 0; | |
389 | return cell; | |
390 | } | |
391 | ||
392 | int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, | |
393 | u32 *array, int count) | |
394 | { | |
395 | const u32 *cell; | |
396 | int i, err = 0; | |
397 | ||
398 | debug("%s: %s\n", __func__, prop_name); | |
399 | cell = get_prop_check_min_len(blob, node, prop_name, | |
400 | sizeof(u32) * count, &err); | |
401 | if (!err) { | |
402 | for (i = 0; i < count; i++) | |
403 | array[i] = fdt32_to_cpu(cell[i]); | |
404 | } | |
405 | return err; | |
406 | } | |
407 | ||
96875e7d SG |
408 | const u32 *fdtdec_locate_array(const void *blob, int node, |
409 | const char *prop_name, int count) | |
410 | { | |
411 | const u32 *cell; | |
412 | int err; | |
413 | ||
414 | cell = get_prop_check_min_len(blob, node, prop_name, | |
415 | sizeof(u32) * count, &err); | |
416 | return err ? NULL : cell; | |
417 | } | |
418 | ||
d17da655 SG |
419 | int fdtdec_get_bool(const void *blob, int node, const char *prop_name) |
420 | { | |
421 | const s32 *cell; | |
422 | int len; | |
423 | ||
424 | debug("%s: %s\n", __func__, prop_name); | |
425 | cell = fdt_getprop(blob, node, prop_name, &len); | |
426 | return cell != NULL; | |
427 | } | |
ed3ee5cd SG |
428 | |
429 | /** | |
430 | * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no | |
431 | * terminating item. | |
432 | * | |
433 | * @param blob FDT blob to use | |
434 | * @param node Node to look at | |
435 | * @param prop_name Node property name | |
436 | * @param gpio Array of gpio elements to fill from FDT. This will be | |
437 | * untouched if either 0 or an error is returned | |
438 | * @param max_count Maximum number of elements allowed | |
439 | * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would | |
440 | * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. | |
441 | */ | |
5921f6a2 AK |
442 | int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, |
443 | struct fdt_gpio_state *gpio, int max_count) | |
ed3ee5cd SG |
444 | { |
445 | const struct fdt_property *prop; | |
446 | const u32 *cell; | |
447 | const char *name; | |
448 | int len, i; | |
449 | ||
450 | debug("%s: %s\n", __func__, prop_name); | |
451 | assert(max_count > 0); | |
452 | prop = fdt_get_property(blob, node, prop_name, &len); | |
453 | if (!prop) { | |
1cb2323b | 454 | debug("%s: property '%s' missing\n", __func__, prop_name); |
ed3ee5cd SG |
455 | return -FDT_ERR_NOTFOUND; |
456 | } | |
457 | ||
458 | /* We will use the name to tag the GPIO */ | |
459 | name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); | |
460 | cell = (u32 *)prop->data; | |
461 | len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ | |
462 | if (len > max_count) { | |
1cb2323b | 463 | debug(" %s: too many GPIOs / cells for " |
ed3ee5cd SG |
464 | "property '%s'\n", __func__, prop_name); |
465 | return -FDT_ERR_BADLAYOUT; | |
466 | } | |
467 | ||
468 | /* Read out the GPIO data from the cells */ | |
469 | for (i = 0; i < len; i++, cell += 3) { | |
470 | gpio[i].gpio = fdt32_to_cpu(cell[1]); | |
471 | gpio[i].flags = fdt32_to_cpu(cell[2]); | |
472 | gpio[i].name = name; | |
473 | } | |
474 | ||
475 | return len; | |
476 | } | |
477 | ||
478 | int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, | |
479 | struct fdt_gpio_state *gpio) | |
480 | { | |
481 | int err; | |
482 | ||
483 | debug("%s: %s\n", __func__, prop_name); | |
484 | gpio->gpio = FDT_GPIO_NONE; | |
485 | gpio->name = NULL; | |
486 | err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); | |
487 | return err == 1 ? 0 : err; | |
488 | } | |
489 | ||
202ff753 SP |
490 | int fdtdec_get_gpio(struct fdt_gpio_state *gpio) |
491 | { | |
492 | int val; | |
493 | ||
494 | if (!fdt_gpio_isvalid(gpio)) | |
495 | return -1; | |
496 | ||
497 | val = gpio_get_value(gpio->gpio); | |
498 | return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; | |
499 | } | |
500 | ||
501 | int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) | |
502 | { | |
503 | if (!fdt_gpio_isvalid(gpio)) | |
504 | return -1; | |
505 | ||
506 | val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; | |
507 | return gpio_set_value(gpio->gpio, val); | |
508 | } | |
509 | ||
ed3ee5cd SG |
510 | int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) |
511 | { | |
512 | /* | |
513 | * Return success if there is no GPIO defined. This is used for | |
514 | * optional GPIOs) | |
515 | */ | |
516 | if (!fdt_gpio_isvalid(gpio)) | |
517 | return 0; | |
518 | ||
519 | if (gpio_request(gpio->gpio, gpio->name)) | |
520 | return -1; | |
521 | return 0; | |
522 | } | |
bed4d892 AS |
523 | |
524 | int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, | |
525 | u8 *array, int count) | |
526 | { | |
527 | const u8 *cell; | |
528 | int err; | |
529 | ||
530 | cell = get_prop_check_min_len(blob, node, prop_name, count, &err); | |
531 | if (!err) | |
532 | memcpy(array, cell, count); | |
533 | return err; | |
534 | } | |
535 | ||
536 | const u8 *fdtdec_locate_byte_array(const void *blob, int node, | |
537 | const char *prop_name, int count) | |
538 | { | |
539 | const u8 *cell; | |
540 | int err; | |
541 | ||
542 | cell = get_prop_check_min_len(blob, node, prop_name, count, &err); | |
543 | if (err) | |
544 | return NULL; | |
545 | return cell; | |
546 | } | |
09258f1e | 547 | |
09258f1e AK |
548 | int fdtdec_get_config_int(const void *blob, const char *prop_name, |
549 | int default_val) | |
550 | { | |
551 | int config_node; | |
552 | ||
553 | debug("%s: %s\n", __func__, prop_name); | |
554 | config_node = fdt_path_offset(blob, "/config"); | |
555 | if (config_node < 0) | |
556 | return default_val; | |
557 | return fdtdec_get_int(blob, config_node, prop_name, default_val); | |
558 | } | |
332ab0d5 | 559 | |
79289c0b GB |
560 | int fdtdec_get_config_bool(const void *blob, const char *prop_name) |
561 | { | |
562 | int config_node; | |
563 | const void *prop; | |
564 | ||
565 | debug("%s: %s\n", __func__, prop_name); | |
566 | config_node = fdt_path_offset(blob, "/config"); | |
567 | if (config_node < 0) | |
568 | return 0; | |
569 | prop = fdt_get_property(blob, config_node, prop_name, NULL); | |
570 | ||
571 | return prop != NULL; | |
572 | } | |
573 | ||
332ab0d5 SG |
574 | char *fdtdec_get_config_string(const void *blob, const char *prop_name) |
575 | { | |
576 | const char *nodep; | |
577 | int nodeoffset; | |
578 | int len; | |
579 | ||
580 | debug("%s: %s\n", __func__, prop_name); | |
581 | nodeoffset = fdt_path_offset(blob, "/config"); | |
582 | if (nodeoffset < 0) | |
583 | return NULL; | |
584 | ||
585 | nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); | |
586 | if (!nodep) | |
587 | return NULL; | |
588 | ||
589 | return (char *)nodep; | |
590 | } | |
f20c4619 SG |
591 | |
592 | int fdtdec_decode_region(const void *blob, int node, | |
593 | const char *prop_name, void **ptrp, size_t *size) | |
594 | { | |
595 | const fdt_addr_t *cell; | |
596 | int len; | |
597 | ||
598 | debug("%s: %s\n", __func__, prop_name); | |
599 | cell = fdt_getprop(blob, node, prop_name, &len); | |
600 | if (!cell || (len != sizeof(fdt_addr_t) * 2)) | |
601 | return -1; | |
602 | ||
603 | *ptrp = (void *)fdt_addr_to_cpu(*cell); | |
604 | *size = fdt_size_to_cpu(cell[1]); | |
605 | debug("%s: size=%zx\n", __func__, *size); | |
606 | return 0; | |
607 | } |