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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"), |
e1ae0d1f | 46 | COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), |
87540de3 | 47 | COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), |
b5220bc6 SG |
48 | }; |
49 | ||
a53f4a29 SG |
50 | const char *fdtdec_get_compatible(enum fdt_compat_id id) |
51 | { | |
52 | /* We allow reading of the 'unknown' ID for testing purposes */ | |
53 | assert(id >= 0 && id < COMPAT_COUNT); | |
54 | return compat_names[id]; | |
55 | } | |
56 | ||
b5220bc6 SG |
57 | fdt_addr_t fdtdec_get_addr(const void *blob, int node, |
58 | const char *prop_name) | |
59 | { | |
60 | const fdt_addr_t *cell; | |
61 | int len; | |
62 | ||
1cb2323b | 63 | debug("%s: %s: ", __func__, prop_name); |
b5220bc6 SG |
64 | cell = fdt_getprop(blob, node, prop_name, &len); |
65 | if (cell && (len == sizeof(fdt_addr_t) || | |
1cb2323b SG |
66 | len == sizeof(fdt_addr_t) * 2)) { |
67 | fdt_addr_t addr = fdt_addr_to_cpu(*cell); | |
68 | ||
69 | debug("%p\n", (void *)addr); | |
70 | return addr; | |
71 | } | |
72 | debug("(not found)\n"); | |
b5220bc6 SG |
73 | return FDT_ADDR_T_NONE; |
74 | } | |
75 | ||
76 | s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, | |
77 | s32 default_val) | |
78 | { | |
79 | const s32 *cell; | |
80 | int len; | |
81 | ||
1cb2323b | 82 | debug("%s: %s: ", __func__, prop_name); |
b5220bc6 | 83 | cell = fdt_getprop(blob, node, prop_name, &len); |
1cb2323b SG |
84 | if (cell && len >= sizeof(s32)) { |
85 | s32 val = fdt32_to_cpu(cell[0]); | |
86 | ||
87 | debug("%#x (%d)\n", val, val); | |
88 | return val; | |
89 | } | |
90 | debug("(not found)\n"); | |
b5220bc6 SG |
91 | return default_val; |
92 | } | |
93 | ||
aadef0a1 CLC |
94 | uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, |
95 | uint64_t default_val) | |
96 | { | |
97 | const uint64_t *cell64; | |
98 | int length; | |
99 | ||
100 | cell64 = fdt_getprop(blob, node, prop_name, &length); | |
101 | if (!cell64 || length < sizeof(*cell64)) | |
102 | return default_val; | |
103 | ||
104 | return fdt64_to_cpu(*cell64); | |
105 | } | |
106 | ||
f88fe2de | 107 | int fdtdec_get_is_enabled(const void *blob, int node) |
b5220bc6 SG |
108 | { |
109 | const char *cell; | |
110 | ||
f88fe2de SG |
111 | /* |
112 | * It should say "okay", so only allow that. Some fdts use "ok" but | |
113 | * this is a bug. Please fix your device tree source file. See here | |
114 | * for discussion: | |
115 | * | |
116 | * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html | |
117 | */ | |
b5220bc6 SG |
118 | cell = fdt_getprop(blob, node, "status", NULL); |
119 | if (cell) | |
f88fe2de SG |
120 | return 0 == strcmp(cell, "okay"); |
121 | return 1; | |
b5220bc6 SG |
122 | } |
123 | ||
7cde397b | 124 | enum fdt_compat_id fdtdec_lookup(const void *blob, int node) |
b5220bc6 SG |
125 | { |
126 | enum fdt_compat_id id; | |
127 | ||
128 | /* Search our drivers */ | |
129 | for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) | |
130 | if (0 == fdt_node_check_compatible(blob, node, | |
131 | compat_names[id])) | |
132 | return id; | |
133 | return COMPAT_UNKNOWN; | |
134 | } | |
135 | ||
136 | int fdtdec_next_compatible(const void *blob, int node, | |
137 | enum fdt_compat_id id) | |
138 | { | |
139 | return fdt_node_offset_by_compatible(blob, node, compat_names[id]); | |
140 | } | |
141 | ||
3ddecfc7 SG |
142 | int fdtdec_next_compatible_subnode(const void *blob, int node, |
143 | enum fdt_compat_id id, int *depthp) | |
144 | { | |
145 | do { | |
146 | node = fdt_next_node(blob, node, depthp); | |
147 | } while (*depthp > 1); | |
148 | ||
149 | /* If this is a direct subnode, and compatible, return it */ | |
150 | if (*depthp == 1 && 0 == fdt_node_check_compatible( | |
151 | blob, node, compat_names[id])) | |
152 | return node; | |
153 | ||
154 | return -FDT_ERR_NOTFOUND; | |
155 | } | |
156 | ||
b5220bc6 SG |
157 | int fdtdec_next_alias(const void *blob, const char *name, |
158 | enum fdt_compat_id id, int *upto) | |
159 | { | |
160 | #define MAX_STR_LEN 20 | |
161 | char str[MAX_STR_LEN + 20]; | |
162 | int node, err; | |
163 | ||
164 | /* snprintf() is not available */ | |
165 | assert(strlen(name) < MAX_STR_LEN); | |
166 | sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); | |
00878476 | 167 | node = fdt_path_offset(blob, str); |
b5220bc6 SG |
168 | if (node < 0) |
169 | return node; | |
170 | err = fdt_node_check_compatible(blob, node, compat_names[id]); | |
171 | if (err < 0) | |
172 | return err; | |
f88fe2de SG |
173 | if (err) |
174 | return -FDT_ERR_NOTFOUND; | |
175 | (*upto)++; | |
176 | return node; | |
b5220bc6 SG |
177 | } |
178 | ||
a53f4a29 SG |
179 | int fdtdec_find_aliases_for_id(const void *blob, const char *name, |
180 | enum fdt_compat_id id, int *node_list, int maxcount) | |
c6782270 SG |
181 | { |
182 | memset(node_list, '\0', sizeof(*node_list) * maxcount); | |
183 | ||
184 | return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); | |
185 | } | |
186 | ||
187 | /* TODO: Can we tighten this code up a little? */ | |
188 | int fdtdec_add_aliases_for_id(const void *blob, const char *name, | |
189 | enum fdt_compat_id id, int *node_list, int maxcount) | |
a53f4a29 SG |
190 | { |
191 | int name_len = strlen(name); | |
192 | int nodes[maxcount]; | |
193 | int num_found = 0; | |
194 | int offset, node; | |
195 | int alias_node; | |
196 | int count; | |
197 | int i, j; | |
198 | ||
199 | /* find the alias node if present */ | |
200 | alias_node = fdt_path_offset(blob, "/aliases"); | |
201 | ||
202 | /* | |
203 | * start with nothing, and we can assume that the root node can't | |
204 | * match | |
205 | */ | |
206 | memset(nodes, '\0', sizeof(nodes)); | |
207 | ||
208 | /* First find all the compatible nodes */ | |
209 | for (node = count = 0; node >= 0 && count < maxcount;) { | |
210 | node = fdtdec_next_compatible(blob, node, id); | |
211 | if (node >= 0) | |
212 | nodes[count++] = node; | |
213 | } | |
214 | if (node >= 0) | |
215 | debug("%s: warning: maxcount exceeded with alias '%s'\n", | |
216 | __func__, name); | |
217 | ||
218 | /* Now find all the aliases */ | |
a53f4a29 SG |
219 | for (offset = fdt_first_property_offset(blob, alias_node); |
220 | offset > 0; | |
221 | offset = fdt_next_property_offset(blob, offset)) { | |
222 | const struct fdt_property *prop; | |
223 | const char *path; | |
224 | int number; | |
225 | int found; | |
226 | ||
227 | node = 0; | |
228 | prop = fdt_get_property_by_offset(blob, offset, NULL); | |
229 | path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); | |
230 | if (prop->len && 0 == strncmp(path, name, name_len)) | |
231 | node = fdt_path_offset(blob, prop->data); | |
232 | if (node <= 0) | |
233 | continue; | |
234 | ||
235 | /* Get the alias number */ | |
236 | number = simple_strtoul(path + name_len, NULL, 10); | |
237 | if (number < 0 || number >= maxcount) { | |
238 | debug("%s: warning: alias '%s' is out of range\n", | |
239 | __func__, path); | |
240 | continue; | |
241 | } | |
242 | ||
243 | /* Make sure the node we found is actually in our list! */ | |
244 | found = -1; | |
245 | for (j = 0; j < count; j++) | |
246 | if (nodes[j] == node) { | |
247 | found = j; | |
248 | break; | |
249 | } | |
250 | ||
251 | if (found == -1) { | |
252 | debug("%s: warning: alias '%s' points to a node " | |
253 | "'%s' that is missing or is not compatible " | |
254 | " with '%s'\n", __func__, path, | |
255 | fdt_get_name(blob, node, NULL), | |
256 | compat_names[id]); | |
257 | continue; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Add this node to our list in the right place, and mark | |
262 | * it as done. | |
263 | */ | |
264 | if (fdtdec_get_is_enabled(blob, node)) { | |
c6782270 SG |
265 | if (node_list[number]) { |
266 | debug("%s: warning: alias '%s' requires that " | |
267 | "a node be placed in the list in a " | |
268 | "position which is already filled by " | |
269 | "node '%s'\n", __func__, path, | |
270 | fdt_get_name(blob, node, NULL)); | |
271 | continue; | |
272 | } | |
a53f4a29 SG |
273 | node_list[number] = node; |
274 | if (number >= num_found) | |
275 | num_found = number + 1; | |
276 | } | |
c6782270 | 277 | nodes[found] = 0; |
a53f4a29 SG |
278 | } |
279 | ||
280 | /* Add any nodes not mentioned by an alias */ | |
281 | for (i = j = 0; i < maxcount; i++) { | |
282 | if (!node_list[i]) { | |
283 | for (; j < maxcount; j++) | |
284 | if (nodes[j] && | |
285 | fdtdec_get_is_enabled(blob, nodes[j])) | |
286 | break; | |
287 | ||
288 | /* Have we run out of nodes to add? */ | |
289 | if (j == maxcount) | |
290 | break; | |
291 | ||
292 | assert(!node_list[i]); | |
293 | node_list[i] = nodes[j++]; | |
294 | if (i >= num_found) | |
295 | num_found = i + 1; | |
296 | } | |
297 | } | |
298 | ||
299 | return num_found; | |
300 | } | |
301 | ||
9a263e55 SG |
302 | int fdtdec_check_fdt(void) |
303 | { | |
304 | /* | |
305 | * We must have an FDT, but we cannot panic() yet since the console | |
306 | * is not ready. So for now, just assert(). Boards which need an early | |
307 | * FDT (prior to console ready) will need to make their own | |
308 | * arrangements and do their own checks. | |
309 | */ | |
310 | assert(!fdtdec_prepare_fdt()); | |
311 | return 0; | |
312 | } | |
313 | ||
b5220bc6 SG |
314 | /* |
315 | * This function is a little odd in that it accesses global data. At some | |
316 | * point if the architecture board.c files merge this will make more sense. | |
317 | * Even now, it is common code. | |
318 | */ | |
9a263e55 | 319 | int fdtdec_prepare_fdt(void) |
b5220bc6 | 320 | { |
9a263e55 SG |
321 | if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) { |
322 | printf("No valid FDT found - please append one to U-Boot " | |
323 | "binary, use u-boot-dtb.bin or define " | |
324 | "CONFIG_OF_EMBED\n"); | |
325 | return -1; | |
326 | } | |
b5220bc6 SG |
327 | return 0; |
328 | } | |
d17da655 SG |
329 | |
330 | int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) | |
331 | { | |
332 | const u32 *phandle; | |
333 | int lookup; | |
334 | ||
1cb2323b | 335 | debug("%s: %s\n", __func__, prop_name); |
d17da655 SG |
336 | phandle = fdt_getprop(blob, node, prop_name, NULL); |
337 | if (!phandle) | |
338 | return -FDT_ERR_NOTFOUND; | |
339 | ||
340 | lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); | |
341 | return lookup; | |
342 | } | |
343 | ||
344 | /** | |
345 | * Look up a property in a node and check that it has a minimum length. | |
346 | * | |
347 | * @param blob FDT blob | |
348 | * @param node node to examine | |
349 | * @param prop_name name of property to find | |
350 | * @param min_len minimum property length in bytes | |
351 | * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not | |
352 | found, or -FDT_ERR_BADLAYOUT if not enough data | |
353 | * @return pointer to cell, which is only valid if err == 0 | |
354 | */ | |
355 | static const void *get_prop_check_min_len(const void *blob, int node, | |
356 | const char *prop_name, int min_len, int *err) | |
357 | { | |
358 | const void *cell; | |
359 | int len; | |
360 | ||
361 | debug("%s: %s\n", __func__, prop_name); | |
362 | cell = fdt_getprop(blob, node, prop_name, &len); | |
363 | if (!cell) | |
364 | *err = -FDT_ERR_NOTFOUND; | |
365 | else if (len < min_len) | |
366 | *err = -FDT_ERR_BADLAYOUT; | |
367 | else | |
368 | *err = 0; | |
369 | return cell; | |
370 | } | |
371 | ||
372 | int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, | |
373 | u32 *array, int count) | |
374 | { | |
375 | const u32 *cell; | |
376 | int i, err = 0; | |
377 | ||
378 | debug("%s: %s\n", __func__, prop_name); | |
379 | cell = get_prop_check_min_len(blob, node, prop_name, | |
380 | sizeof(u32) * count, &err); | |
381 | if (!err) { | |
382 | for (i = 0; i < count; i++) | |
383 | array[i] = fdt32_to_cpu(cell[i]); | |
384 | } | |
385 | return err; | |
386 | } | |
387 | ||
96875e7d SG |
388 | const u32 *fdtdec_locate_array(const void *blob, int node, |
389 | const char *prop_name, int count) | |
390 | { | |
391 | const u32 *cell; | |
392 | int err; | |
393 | ||
394 | cell = get_prop_check_min_len(blob, node, prop_name, | |
395 | sizeof(u32) * count, &err); | |
396 | return err ? NULL : cell; | |
397 | } | |
398 | ||
d17da655 SG |
399 | int fdtdec_get_bool(const void *blob, int node, const char *prop_name) |
400 | { | |
401 | const s32 *cell; | |
402 | int len; | |
403 | ||
404 | debug("%s: %s\n", __func__, prop_name); | |
405 | cell = fdt_getprop(blob, node, prop_name, &len); | |
406 | return cell != NULL; | |
407 | } | |
ed3ee5cd SG |
408 | |
409 | /** | |
410 | * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no | |
411 | * terminating item. | |
412 | * | |
413 | * @param blob FDT blob to use | |
414 | * @param node Node to look at | |
415 | * @param prop_name Node property name | |
416 | * @param gpio Array of gpio elements to fill from FDT. This will be | |
417 | * untouched if either 0 or an error is returned | |
418 | * @param max_count Maximum number of elements allowed | |
419 | * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would | |
420 | * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. | |
421 | */ | |
5921f6a2 AK |
422 | int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, |
423 | struct fdt_gpio_state *gpio, int max_count) | |
ed3ee5cd SG |
424 | { |
425 | const struct fdt_property *prop; | |
426 | const u32 *cell; | |
427 | const char *name; | |
428 | int len, i; | |
429 | ||
430 | debug("%s: %s\n", __func__, prop_name); | |
431 | assert(max_count > 0); | |
432 | prop = fdt_get_property(blob, node, prop_name, &len); | |
433 | if (!prop) { | |
1cb2323b | 434 | debug("%s: property '%s' missing\n", __func__, prop_name); |
ed3ee5cd SG |
435 | return -FDT_ERR_NOTFOUND; |
436 | } | |
437 | ||
438 | /* We will use the name to tag the GPIO */ | |
439 | name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); | |
440 | cell = (u32 *)prop->data; | |
441 | len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ | |
442 | if (len > max_count) { | |
1cb2323b | 443 | debug(" %s: too many GPIOs / cells for " |
ed3ee5cd SG |
444 | "property '%s'\n", __func__, prop_name); |
445 | return -FDT_ERR_BADLAYOUT; | |
446 | } | |
447 | ||
448 | /* Read out the GPIO data from the cells */ | |
449 | for (i = 0; i < len; i++, cell += 3) { | |
450 | gpio[i].gpio = fdt32_to_cpu(cell[1]); | |
451 | gpio[i].flags = fdt32_to_cpu(cell[2]); | |
452 | gpio[i].name = name; | |
453 | } | |
454 | ||
455 | return len; | |
456 | } | |
457 | ||
458 | int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, | |
459 | struct fdt_gpio_state *gpio) | |
460 | { | |
461 | int err; | |
462 | ||
463 | debug("%s: %s\n", __func__, prop_name); | |
464 | gpio->gpio = FDT_GPIO_NONE; | |
465 | gpio->name = NULL; | |
466 | err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); | |
467 | return err == 1 ? 0 : err; | |
468 | } | |
469 | ||
202ff753 SP |
470 | int fdtdec_get_gpio(struct fdt_gpio_state *gpio) |
471 | { | |
472 | int val; | |
473 | ||
474 | if (!fdt_gpio_isvalid(gpio)) | |
475 | return -1; | |
476 | ||
477 | val = gpio_get_value(gpio->gpio); | |
478 | return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; | |
479 | } | |
480 | ||
481 | int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) | |
482 | { | |
483 | if (!fdt_gpio_isvalid(gpio)) | |
484 | return -1; | |
485 | ||
486 | val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; | |
487 | return gpio_set_value(gpio->gpio, val); | |
488 | } | |
489 | ||
ed3ee5cd SG |
490 | int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) |
491 | { | |
492 | /* | |
493 | * Return success if there is no GPIO defined. This is used for | |
494 | * optional GPIOs) | |
495 | */ | |
496 | if (!fdt_gpio_isvalid(gpio)) | |
497 | return 0; | |
498 | ||
499 | if (gpio_request(gpio->gpio, gpio->name)) | |
500 | return -1; | |
501 | return 0; | |
502 | } | |
bed4d892 AS |
503 | |
504 | int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, | |
505 | u8 *array, int count) | |
506 | { | |
507 | const u8 *cell; | |
508 | int err; | |
509 | ||
510 | cell = get_prop_check_min_len(blob, node, prop_name, count, &err); | |
511 | if (!err) | |
512 | memcpy(array, cell, count); | |
513 | return err; | |
514 | } | |
515 | ||
516 | const u8 *fdtdec_locate_byte_array(const void *blob, int node, | |
517 | const char *prop_name, int count) | |
518 | { | |
519 | const u8 *cell; | |
520 | int err; | |
521 | ||
522 | cell = get_prop_check_min_len(blob, node, prop_name, count, &err); | |
523 | if (err) | |
524 | return NULL; | |
525 | return cell; | |
526 | } | |
09258f1e | 527 | |
09258f1e AK |
528 | int fdtdec_get_config_int(const void *blob, const char *prop_name, |
529 | int default_val) | |
530 | { | |
531 | int config_node; | |
532 | ||
533 | debug("%s: %s\n", __func__, prop_name); | |
534 | config_node = fdt_path_offset(blob, "/config"); | |
535 | if (config_node < 0) | |
536 | return default_val; | |
537 | return fdtdec_get_int(blob, config_node, prop_name, default_val); | |
538 | } | |
332ab0d5 | 539 | |
79289c0b GB |
540 | int fdtdec_get_config_bool(const void *blob, const char *prop_name) |
541 | { | |
542 | int config_node; | |
543 | const void *prop; | |
544 | ||
545 | debug("%s: %s\n", __func__, prop_name); | |
546 | config_node = fdt_path_offset(blob, "/config"); | |
547 | if (config_node < 0) | |
548 | return 0; | |
549 | prop = fdt_get_property(blob, config_node, prop_name, NULL); | |
550 | ||
551 | return prop != NULL; | |
552 | } | |
553 | ||
332ab0d5 SG |
554 | char *fdtdec_get_config_string(const void *blob, const char *prop_name) |
555 | { | |
556 | const char *nodep; | |
557 | int nodeoffset; | |
558 | int len; | |
559 | ||
560 | debug("%s: %s\n", __func__, prop_name); | |
561 | nodeoffset = fdt_path_offset(blob, "/config"); | |
562 | if (nodeoffset < 0) | |
563 | return NULL; | |
564 | ||
565 | nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); | |
566 | if (!nodep) | |
567 | return NULL; | |
568 | ||
569 | return (char *)nodep; | |
570 | } | |
f20c4619 SG |
571 | |
572 | int fdtdec_decode_region(const void *blob, int node, | |
573 | const char *prop_name, void **ptrp, size_t *size) | |
574 | { | |
575 | const fdt_addr_t *cell; | |
576 | int len; | |
577 | ||
578 | debug("%s: %s\n", __func__, prop_name); | |
579 | cell = fdt_getprop(blob, node, prop_name, &len); | |
580 | if (!cell || (len != sizeof(fdt_addr_t) * 2)) | |
581 | return -1; | |
582 | ||
583 | *ptrp = (void *)fdt_addr_to_cpu(*cell); | |
584 | *size = fdt_size_to_cpu(cell[1]); | |
585 | debug("%s: size=%zx\n", __func__, *size); | |
586 | return 0; | |
587 | } |