blob: ad25a0c9c929627b43e10761d42d679e07e05b77 [file] [log] [blame]
Simon Glassb5220bc2011-10-24 19:15:32 +00001/*
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
Michal Simeke46431e2012-07-11 02:26:38 +000027#include <asm/gpio.h>
Simon Glassed3ee5c2012-02-27 10:52:36 +000028
Simon Glassb5220bc2011-10-24 19:15:32 +000029DECLARE_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
37static const char * const compat_names[COMPAT_COUNT] = {
Simon Glassf88fe2d2012-02-27 10:52:34 +000038 COMPAT(UNKNOWN, "<none>"),
Simon Glass87f938c2012-02-27 10:52:49 +000039 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
Tom Warrene32624e2013-02-08 07:25:30 +000040 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
Yen Lin96a78ac2012-03-06 19:00:23 +000041 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
42 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
Jimmy Zhang0e35ad02012-04-02 13:18:52 +000043 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
44 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
Rakesh Iyer6642a682012-04-17 09:01:35 +000045 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
Jim Lin312693c2012-07-29 20:53:29 +000046 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
Simon Glasse1ae0d12012-10-17 13:24:49 +000047 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
Wei Ni87540de2012-10-17 13:24:50 +000048 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
Tom Warrenf4e4e0b2013-03-04 14:07:18 -070049 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
Tom Warrenc9aa8312013-02-21 12:31:30 +000050 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
Allen Martin8f1b46b2013-01-29 13:51:24 +000051 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
Allen Martinb19f5742013-01-29 13:51:28 +000052 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
Allen Martinc3bb3c82013-03-16 18:58:09 +000053 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
Hatim RVcc9fe332012-12-11 00:52:46 +000054 COMPAT(SMSC_LAN9215, "smsc,lan9215"),
55 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
Rajeshwari Shindec34253d2012-12-26 20:03:10 +000056 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
Rajeshwari Shinde72dbff12012-12-26 20:03:16 +000057 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
58 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
Rajeshwari Shinde5d506592012-12-26 20:03:20 +000059 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000060 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
61 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
Akshay Saraswat618766c2013-02-25 01:13:01 +000062 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
Ajay Kumard7377b52013-02-21 23:53:00 +000063 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
Ajay Kumar1e4706a2013-02-21 23:53:05 +000064 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
Amar45a4d4d2013-04-27 11:42:52 +053065 COMPAT(SAMSUNG_EXYNOS5_DWMMC, "samsung,exynos5250-dwmmc"),
Rajeshwari Shindecd577e22013-01-08 21:03:38 +000066 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
Simon Glassbb8215f2013-03-11 06:08:08 +000067 COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
Rajeshwari Shinde7772bb72013-02-14 19:46:15 +000068 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
Rong Changf6267992013-04-12 10:44:57 +000069 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
Vincent Palatinec34fa52013-04-12 11:04:36 +000070 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
Simon Glassb5220bc2011-10-24 19:15:32 +000071};
72
Simon Glassa53f4a22012-01-17 08:20:50 +000073const char *fdtdec_get_compatible(enum fdt_compat_id id)
74{
75 /* We allow reading of the 'unknown' ID for testing purposes */
76 assert(id >= 0 && id < COMPAT_COUNT);
77 return compat_names[id];
78}
79
Simon Glass4397a2a2013-03-19 04:58:51 +000080fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
81 const char *prop_name, fdt_size_t *sizep)
Simon Glassb5220bc2011-10-24 19:15:32 +000082{
83 const fdt_addr_t *cell;
84 int len;
85
Simon Glass1cb23232012-07-12 05:25:01 +000086 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +000087 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass4397a2a2013-03-19 04:58:51 +000088 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
89 len == sizeof(fdt_addr_t) * 2)) {
Simon Glass1cb23232012-07-12 05:25:01 +000090 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
Simon Glass4397a2a2013-03-19 04:58:51 +000091 if (sizep) {
92 const fdt_size_t *size;
Simon Glass1cb23232012-07-12 05:25:01 +000093
Simon Glass4397a2a2013-03-19 04:58:51 +000094 size = (fdt_size_t *)((char *)cell +
95 sizeof(fdt_addr_t));
96 *sizep = fdt_size_to_cpu(*size);
97 debug("addr=%p, size=%p\n", (void *)addr,
98 (void *)*sizep);
99 } else {
100 debug("%p\n", (void *)addr);
101 }
Simon Glass1cb23232012-07-12 05:25:01 +0000102 return addr;
103 }
104 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000105 return FDT_ADDR_T_NONE;
106}
107
Simon Glass4397a2a2013-03-19 04:58:51 +0000108fdt_addr_t fdtdec_get_addr(const void *blob, int node,
109 const char *prop_name)
110{
111 return fdtdec_get_addr_size(blob, node, prop_name, NULL);
112}
113
Simon Glassb5220bc2011-10-24 19:15:32 +0000114s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
115 s32 default_val)
116{
117 const s32 *cell;
118 int len;
119
Simon Glass1cb23232012-07-12 05:25:01 +0000120 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +0000121 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass1cb23232012-07-12 05:25:01 +0000122 if (cell && len >= sizeof(s32)) {
123 s32 val = fdt32_to_cpu(cell[0]);
124
125 debug("%#x (%d)\n", val, val);
126 return val;
127 }
128 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000129 return default_val;
130}
131
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000132uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
133 uint64_t default_val)
134{
135 const uint64_t *cell64;
136 int length;
137
138 cell64 = fdt_getprop(blob, node, prop_name, &length);
139 if (!cell64 || length < sizeof(*cell64))
140 return default_val;
141
142 return fdt64_to_cpu(*cell64);
143}
144
Simon Glassf88fe2d2012-02-27 10:52:34 +0000145int fdtdec_get_is_enabled(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000146{
147 const char *cell;
148
Simon Glassf88fe2d2012-02-27 10:52:34 +0000149 /*
150 * It should say "okay", so only allow that. Some fdts use "ok" but
151 * this is a bug. Please fix your device tree source file. See here
152 * for discussion:
153 *
154 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
155 */
Simon Glassb5220bc2011-10-24 19:15:32 +0000156 cell = fdt_getprop(blob, node, "status", NULL);
157 if (cell)
Simon Glassf88fe2d2012-02-27 10:52:34 +0000158 return 0 == strcmp(cell, "okay");
159 return 1;
Simon Glassb5220bc2011-10-24 19:15:32 +0000160}
161
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500162enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000163{
164 enum fdt_compat_id id;
165
166 /* Search our drivers */
167 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
168 if (0 == fdt_node_check_compatible(blob, node,
169 compat_names[id]))
170 return id;
171 return COMPAT_UNKNOWN;
172}
173
174int fdtdec_next_compatible(const void *blob, int node,
175 enum fdt_compat_id id)
176{
177 return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
178}
179
Simon Glass3ddecfc2012-04-02 13:18:42 +0000180int fdtdec_next_compatible_subnode(const void *blob, int node,
181 enum fdt_compat_id id, int *depthp)
182{
183 do {
184 node = fdt_next_node(blob, node, depthp);
185 } while (*depthp > 1);
186
187 /* If this is a direct subnode, and compatible, return it */
188 if (*depthp == 1 && 0 == fdt_node_check_compatible(
189 blob, node, compat_names[id]))
190 return node;
191
192 return -FDT_ERR_NOTFOUND;
193}
194
Simon Glassb5220bc2011-10-24 19:15:32 +0000195int fdtdec_next_alias(const void *blob, const char *name,
196 enum fdt_compat_id id, int *upto)
197{
198#define MAX_STR_LEN 20
199 char str[MAX_STR_LEN + 20];
200 int node, err;
201
202 /* snprintf() is not available */
203 assert(strlen(name) < MAX_STR_LEN);
204 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
Simon Glass00878472012-10-31 14:02:42 +0000205 node = fdt_path_offset(blob, str);
Simon Glassb5220bc2011-10-24 19:15:32 +0000206 if (node < 0)
207 return node;
208 err = fdt_node_check_compatible(blob, node, compat_names[id]);
209 if (err < 0)
210 return err;
Simon Glassf88fe2d2012-02-27 10:52:34 +0000211 if (err)
212 return -FDT_ERR_NOTFOUND;
213 (*upto)++;
214 return node;
Simon Glassb5220bc2011-10-24 19:15:32 +0000215}
216
Simon Glassa53f4a22012-01-17 08:20:50 +0000217int fdtdec_find_aliases_for_id(const void *blob, const char *name,
218 enum fdt_compat_id id, int *node_list, int maxcount)
219{
Simon Glassc6782272012-02-03 15:13:53 +0000220 memset(node_list, '\0', sizeof(*node_list) * maxcount);
221
222 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
223}
224
225/* TODO: Can we tighten this code up a little? */
226int fdtdec_add_aliases_for_id(const void *blob, const char *name,
227 enum fdt_compat_id id, int *node_list, int maxcount)
228{
Simon Glassa53f4a22012-01-17 08:20:50 +0000229 int name_len = strlen(name);
230 int nodes[maxcount];
231 int num_found = 0;
232 int offset, node;
233 int alias_node;
234 int count;
235 int i, j;
236
237 /* find the alias node if present */
238 alias_node = fdt_path_offset(blob, "/aliases");
239
240 /*
241 * start with nothing, and we can assume that the root node can't
242 * match
243 */
244 memset(nodes, '\0', sizeof(nodes));
245
246 /* First find all the compatible nodes */
247 for (node = count = 0; node >= 0 && count < maxcount;) {
248 node = fdtdec_next_compatible(blob, node, id);
249 if (node >= 0)
250 nodes[count++] = node;
251 }
252 if (node >= 0)
253 debug("%s: warning: maxcount exceeded with alias '%s'\n",
254 __func__, name);
255
256 /* Now find all the aliases */
Simon Glassa53f4a22012-01-17 08:20:50 +0000257 for (offset = fdt_first_property_offset(blob, alias_node);
258 offset > 0;
259 offset = fdt_next_property_offset(blob, offset)) {
260 const struct fdt_property *prop;
261 const char *path;
262 int number;
263 int found;
264
265 node = 0;
266 prop = fdt_get_property_by_offset(blob, offset, NULL);
267 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
268 if (prop->len && 0 == strncmp(path, name, name_len))
269 node = fdt_path_offset(blob, prop->data);
270 if (node <= 0)
271 continue;
272
273 /* Get the alias number */
274 number = simple_strtoul(path + name_len, NULL, 10);
275 if (number < 0 || number >= maxcount) {
276 debug("%s: warning: alias '%s' is out of range\n",
277 __func__, path);
278 continue;
279 }
280
281 /* Make sure the node we found is actually in our list! */
282 found = -1;
283 for (j = 0; j < count; j++)
284 if (nodes[j] == node) {
285 found = j;
286 break;
287 }
288
289 if (found == -1) {
290 debug("%s: warning: alias '%s' points to a node "
291 "'%s' that is missing or is not compatible "
292 " with '%s'\n", __func__, path,
293 fdt_get_name(blob, node, NULL),
294 compat_names[id]);
295 continue;
296 }
297
298 /*
299 * Add this node to our list in the right place, and mark
300 * it as done.
301 */
302 if (fdtdec_get_is_enabled(blob, node)) {
Simon Glassc6782272012-02-03 15:13:53 +0000303 if (node_list[number]) {
304 debug("%s: warning: alias '%s' requires that "
305 "a node be placed in the list in a "
306 "position which is already filled by "
307 "node '%s'\n", __func__, path,
308 fdt_get_name(blob, node, NULL));
309 continue;
310 }
Simon Glassa53f4a22012-01-17 08:20:50 +0000311 node_list[number] = node;
312 if (number >= num_found)
313 num_found = number + 1;
314 }
Simon Glassc6782272012-02-03 15:13:53 +0000315 nodes[found] = 0;
Simon Glassa53f4a22012-01-17 08:20:50 +0000316 }
317
318 /* Add any nodes not mentioned by an alias */
319 for (i = j = 0; i < maxcount; i++) {
320 if (!node_list[i]) {
321 for (; j < maxcount; j++)
322 if (nodes[j] &&
323 fdtdec_get_is_enabled(blob, nodes[j]))
324 break;
325
326 /* Have we run out of nodes to add? */
327 if (j == maxcount)
328 break;
329
330 assert(!node_list[i]);
331 node_list[i] = nodes[j++];
332 if (i >= num_found)
333 num_found = i + 1;
334 }
335 }
336
337 return num_found;
338}
339
Simon Glass9a263e52012-03-28 10:08:24 +0000340int fdtdec_check_fdt(void)
341{
342 /*
343 * We must have an FDT, but we cannot panic() yet since the console
344 * is not ready. So for now, just assert(). Boards which need an early
345 * FDT (prior to console ready) will need to make their own
346 * arrangements and do their own checks.
347 */
348 assert(!fdtdec_prepare_fdt());
349 return 0;
350}
351
Simon Glassb5220bc2011-10-24 19:15:32 +0000352/*
353 * This function is a little odd in that it accesses global data. At some
354 * point if the architecture board.c files merge this will make more sense.
355 * Even now, it is common code.
356 */
Simon Glass9a263e52012-03-28 10:08:24 +0000357int fdtdec_prepare_fdt(void)
Simon Glassb5220bc2011-10-24 19:15:32 +0000358{
Simon Glassc309c2d2013-04-20 08:42:46 +0000359 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
360 fdt_check_header(gd->fdt_blob)) {
Simon Glass9a263e52012-03-28 10:08:24 +0000361 printf("No valid FDT found - please append one to U-Boot "
362 "binary, use u-boot-dtb.bin or define "
Simon Glassa733b062013-04-26 02:53:43 +0000363 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
Simon Glass9a263e52012-03-28 10:08:24 +0000364 return -1;
365 }
Simon Glassb5220bc2011-10-24 19:15:32 +0000366 return 0;
367}
Simon Glassd17da652012-02-27 10:52:35 +0000368
369int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
370{
371 const u32 *phandle;
372 int lookup;
373
Simon Glass1cb23232012-07-12 05:25:01 +0000374 debug("%s: %s\n", __func__, prop_name);
Simon Glassd17da652012-02-27 10:52:35 +0000375 phandle = fdt_getprop(blob, node, prop_name, NULL);
376 if (!phandle)
377 return -FDT_ERR_NOTFOUND;
378
379 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
380 return lookup;
381}
382
383/**
384 * Look up a property in a node and check that it has a minimum length.
385 *
386 * @param blob FDT blob
387 * @param node node to examine
388 * @param prop_name name of property to find
389 * @param min_len minimum property length in bytes
390 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
391 found, or -FDT_ERR_BADLAYOUT if not enough data
392 * @return pointer to cell, which is only valid if err == 0
393 */
394static const void *get_prop_check_min_len(const void *blob, int node,
395 const char *prop_name, int min_len, int *err)
396{
397 const void *cell;
398 int len;
399
400 debug("%s: %s\n", __func__, prop_name);
401 cell = fdt_getprop(blob, node, prop_name, &len);
402 if (!cell)
403 *err = -FDT_ERR_NOTFOUND;
404 else if (len < min_len)
405 *err = -FDT_ERR_BADLAYOUT;
406 else
407 *err = 0;
408 return cell;
409}
410
411int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
412 u32 *array, int count)
413{
414 const u32 *cell;
415 int i, err = 0;
416
417 debug("%s: %s\n", __func__, prop_name);
418 cell = get_prop_check_min_len(blob, node, prop_name,
419 sizeof(u32) * count, &err);
420 if (!err) {
421 for (i = 0; i < count; i++)
422 array[i] = fdt32_to_cpu(cell[i]);
423 }
424 return err;
425}
426
Simon Glass96875e72012-04-02 13:18:41 +0000427const u32 *fdtdec_locate_array(const void *blob, int node,
428 const char *prop_name, int count)
429{
430 const u32 *cell;
431 int err;
432
433 cell = get_prop_check_min_len(blob, node, prop_name,
434 sizeof(u32) * count, &err);
435 return err ? NULL : cell;
436}
437
Simon Glassd17da652012-02-27 10:52:35 +0000438int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
439{
440 const s32 *cell;
441 int len;
442
443 debug("%s: %s\n", __func__, prop_name);
444 cell = fdt_getprop(blob, node, prop_name, &len);
445 return cell != NULL;
446}
Simon Glassed3ee5c2012-02-27 10:52:36 +0000447
448/**
449 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
450 * terminating item.
451 *
452 * @param blob FDT blob to use
453 * @param node Node to look at
454 * @param prop_name Node property name
455 * @param gpio Array of gpio elements to fill from FDT. This will be
456 * untouched if either 0 or an error is returned
457 * @param max_count Maximum number of elements allowed
458 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
459 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
460 */
Abhilash Kesavan5921f6a2012-10-25 16:31:01 +0000461int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
462 struct fdt_gpio_state *gpio, int max_count)
Simon Glassed3ee5c2012-02-27 10:52:36 +0000463{
464 const struct fdt_property *prop;
465 const u32 *cell;
466 const char *name;
467 int len, i;
468
469 debug("%s: %s\n", __func__, prop_name);
470 assert(max_count > 0);
471 prop = fdt_get_property(blob, node, prop_name, &len);
472 if (!prop) {
Simon Glass1cb23232012-07-12 05:25:01 +0000473 debug("%s: property '%s' missing\n", __func__, prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000474 return -FDT_ERR_NOTFOUND;
475 }
476
477 /* We will use the name to tag the GPIO */
478 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
479 cell = (u32 *)prop->data;
480 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
481 if (len > max_count) {
Simon Glass1cb23232012-07-12 05:25:01 +0000482 debug(" %s: too many GPIOs / cells for "
Simon Glassed3ee5c2012-02-27 10:52:36 +0000483 "property '%s'\n", __func__, prop_name);
484 return -FDT_ERR_BADLAYOUT;
485 }
486
487 /* Read out the GPIO data from the cells */
488 for (i = 0; i < len; i++, cell += 3) {
489 gpio[i].gpio = fdt32_to_cpu(cell[1]);
490 gpio[i].flags = fdt32_to_cpu(cell[2]);
491 gpio[i].name = name;
492 }
493
494 return len;
495}
496
497int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
498 struct fdt_gpio_state *gpio)
499{
500 int err;
501
502 debug("%s: %s\n", __func__, prop_name);
503 gpio->gpio = FDT_GPIO_NONE;
504 gpio->name = NULL;
505 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
506 return err == 1 ? 0 : err;
507}
508
Sean Paul202ff752012-10-25 16:31:06 +0000509int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
510{
511 int val;
512
513 if (!fdt_gpio_isvalid(gpio))
514 return -1;
515
516 val = gpio_get_value(gpio->gpio);
517 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
518}
519
520int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
521{
522 if (!fdt_gpio_isvalid(gpio))
523 return -1;
524
525 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
526 return gpio_set_value(gpio->gpio, val);
527}
528
Simon Glassed3ee5c2012-02-27 10:52:36 +0000529int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
530{
531 /*
532 * Return success if there is no GPIO defined. This is used for
533 * optional GPIOs)
534 */
535 if (!fdt_gpio_isvalid(gpio))
536 return 0;
537
538 if (gpio_request(gpio->gpio, gpio->name))
539 return -1;
540 return 0;
541}
Anton Staffbed4d892012-04-17 09:01:28 +0000542
543int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
544 u8 *array, int count)
545{
546 const u8 *cell;
547 int err;
548
549 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
550 if (!err)
551 memcpy(array, cell, count);
552 return err;
553}
554
555const u8 *fdtdec_locate_byte_array(const void *blob, int node,
556 const char *prop_name, int count)
557{
558 const u8 *cell;
559 int err;
560
561 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
562 if (err)
563 return NULL;
564 return cell;
565}
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000566
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000567int fdtdec_get_config_int(const void *blob, const char *prop_name,
568 int default_val)
569{
570 int config_node;
571
572 debug("%s: %s\n", __func__, prop_name);
573 config_node = fdt_path_offset(blob, "/config");
574 if (config_node < 0)
575 return default_val;
576 return fdtdec_get_int(blob, config_node, prop_name, default_val);
577}
Simon Glass332ab0d2012-10-25 16:30:59 +0000578
Gabe Black79289c02012-10-25 16:31:04 +0000579int fdtdec_get_config_bool(const void *blob, const char *prop_name)
580{
581 int config_node;
582 const void *prop;
583
584 debug("%s: %s\n", __func__, prop_name);
585 config_node = fdt_path_offset(blob, "/config");
586 if (config_node < 0)
587 return 0;
588 prop = fdt_get_property(blob, config_node, prop_name, NULL);
589
590 return prop != NULL;
591}
592
Simon Glass332ab0d2012-10-25 16:30:59 +0000593char *fdtdec_get_config_string(const void *blob, const char *prop_name)
594{
595 const char *nodep;
596 int nodeoffset;
597 int len;
598
599 debug("%s: %s\n", __func__, prop_name);
600 nodeoffset = fdt_path_offset(blob, "/config");
601 if (nodeoffset < 0)
602 return NULL;
603
604 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
605 if (!nodep)
606 return NULL;
607
608 return (char *)nodep;
609}
Simon Glassf20c4612012-10-25 16:31:00 +0000610
611int fdtdec_decode_region(const void *blob, int node,
612 const char *prop_name, void **ptrp, size_t *size)
613{
614 const fdt_addr_t *cell;
615 int len;
616
617 debug("%s: %s\n", __func__, prop_name);
618 cell = fdt_getprop(blob, node, prop_name, &len);
619 if (!cell || (len != sizeof(fdt_addr_t) * 2))
620 return -1;
621
622 *ptrp = (void *)fdt_addr_to_cpu(*cell);
623 *size = fdt_size_to_cpu(cell[1]);
624 debug("%s: size=%zx\n", __func__, *size);
625 return 0;
626}