blob: c97fad3076c52e89fd32d39073b4a80536aa534b [file] [log] [blame]
Simon Glassb5220bc2011-10-24 19:15:32 +00001/*
2 * Copyright (c) 2011 The Chromium OS Authors.
Wolfgang Denk1a459662013-07-08 09:37:19 +02003 * SPDX-License-Identifier: GPL-2.0+
Simon Glassb5220bc2011-10-24 19:15:32 +00004 */
5
6#include <common.h>
7#include <serial.h>
8#include <libfdt.h>
9#include <fdtdec.h>
10
Michal Simeke46431e2012-07-11 02:26:38 +000011#include <asm/gpio.h>
Simon Glassed3ee5c2012-02-27 10:52:36 +000012
Simon Glassb5220bc2011-10-24 19:15:32 +000013DECLARE_GLOBAL_DATA_PTR;
14
15/*
16 * Here are the type we know about. One day we might allow drivers to
17 * register. For now we just put them here. The COMPAT macro allows us to
18 * turn this into a sparse list later, and keeps the ID with the name.
19 */
20#define COMPAT(id, name) name
21static const char * const compat_names[COMPAT_COUNT] = {
Simon Glassf88fe2d2012-02-27 10:52:34 +000022 COMPAT(UNKNOWN, "<none>"),
Simon Glass87f938c2012-02-27 10:52:49 +000023 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
Jim Lin7e44d932013-06-21 19:05:47 +080024 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"),
25 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"),
Tom Warrene32624e2013-02-08 07:25:30 +000026 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
Yen Lin96a78ac2012-03-06 19:00:23 +000027 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
28 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
Jimmy Zhang0e35ad02012-04-02 13:18:52 +000029 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
30 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
Rakesh Iyer6642a682012-04-17 09:01:35 +000031 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
Jim Lin312693c2012-07-29 20:53:29 +000032 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
Simon Glasse1ae0d12012-10-17 13:24:49 +000033 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
Wei Ni87540de2012-10-17 13:24:50 +000034 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
Stephen Warrena73ca472014-01-24 12:46:06 -070035 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
Tom Warrenf4e4e0b2013-03-04 14:07:18 -070036 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
Tom Warrenc9aa8312013-02-21 12:31:30 +000037 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
Allen Martin8f1b46b2013-01-29 13:51:24 +000038 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
Allen Martinb19f5742013-01-29 13:51:28 +000039 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
Allen Martinc3bb3c82013-03-16 18:58:09 +000040 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
Hatim RVcc9fe332012-12-11 00:52:46 +000041 COMPAT(SMSC_LAN9215, "smsc,lan9215"),
42 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
Rajeshwari Shindec34253d2012-12-26 20:03:10 +000043 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
Rajeshwari Shinde72dbff12012-12-26 20:03:16 +000044 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
45 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
Rajeshwari Shinde5d506592012-12-26 20:03:20 +000046 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
Hung-ying Tyan88364382013-05-15 18:27:28 +080047 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
Hung-ying Tyan713cb682013-05-15 18:27:32 +080048 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000049 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
Vivek Gautam108b85b2013-09-14 14:02:48 +053050 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"),
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000051 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
Vivek Gautam108b85b2013-09-14 14:02:48 +053052 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
Akshay Saraswat618766c2013-02-25 01:13:01 +000053 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
Ajay Kumard7377b52013-02-21 23:53:00 +000054 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
Piotr Wilczekde461c52014-03-07 14:59:39 +010055 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
Ajay Kumar1e4706a2013-02-21 23:53:05 +000056 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
Amar45a4d4d2013-04-27 11:42:52 +053057 COMPAT(SAMSUNG_EXYNOS5_DWMMC, "samsung,exynos5250-dwmmc"),
Rajeshwari Shindeee1e3c22013-06-24 16:47:20 +053058 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
Rajeshwari Shindecd577e22013-01-08 21:03:38 +000059 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
Simon Glassbb8215f2013-03-11 06:08:08 +000060 COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
Rajeshwari Shinde7772bb72013-02-14 19:46:15 +000061 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
Rong Changf6267992013-04-12 10:44:57 +000062 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
Vincent Palatinec34fa52013-04-12 11:04:36 +000063 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
naveen krishna chatradhiecbd7e12013-04-29 15:58:52 -070064 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
Simon Glassb5220bc2011-10-24 19:15:32 +000065};
66
Simon Glassa53f4a22012-01-17 08:20:50 +000067const char *fdtdec_get_compatible(enum fdt_compat_id id)
68{
69 /* We allow reading of the 'unknown' ID for testing purposes */
70 assert(id >= 0 && id < COMPAT_COUNT);
71 return compat_names[id];
72}
73
Simon Glass4397a2a2013-03-19 04:58:51 +000074fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
75 const char *prop_name, fdt_size_t *sizep)
Simon Glassb5220bc2011-10-24 19:15:32 +000076{
77 const fdt_addr_t *cell;
78 int len;
79
Simon Glass1cb23232012-07-12 05:25:01 +000080 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +000081 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass4397a2a2013-03-19 04:58:51 +000082 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
83 len == sizeof(fdt_addr_t) * 2)) {
Simon Glass1cb23232012-07-12 05:25:01 +000084 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
Simon Glass4397a2a2013-03-19 04:58:51 +000085 if (sizep) {
86 const fdt_size_t *size;
Simon Glass1cb23232012-07-12 05:25:01 +000087
Simon Glass4397a2a2013-03-19 04:58:51 +000088 size = (fdt_size_t *)((char *)cell +
89 sizeof(fdt_addr_t));
90 *sizep = fdt_size_to_cpu(*size);
Simon Glass370b6c52013-11-10 10:26:54 -070091 debug("addr=%08lx, size=%08x\n",
92 (ulong)addr, *sizep);
Simon Glass4397a2a2013-03-19 04:58:51 +000093 } else {
Simon Glass370b6c52013-11-10 10:26:54 -070094 debug("%08lx\n", (ulong)addr);
Simon Glass4397a2a2013-03-19 04:58:51 +000095 }
Simon Glass1cb23232012-07-12 05:25:01 +000096 return addr;
97 }
98 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +000099 return FDT_ADDR_T_NONE;
100}
101
Simon Glass4397a2a2013-03-19 04:58:51 +0000102fdt_addr_t fdtdec_get_addr(const void *blob, int node,
103 const char *prop_name)
104{
105 return fdtdec_get_addr_size(blob, node, prop_name, NULL);
106}
107
Simon Glassb5220bc2011-10-24 19:15:32 +0000108s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
109 s32 default_val)
110{
111 const s32 *cell;
112 int len;
113
Simon Glass1cb23232012-07-12 05:25:01 +0000114 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +0000115 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass1cb23232012-07-12 05:25:01 +0000116 if (cell && len >= sizeof(s32)) {
117 s32 val = fdt32_to_cpu(cell[0]);
118
119 debug("%#x (%d)\n", val, val);
120 return val;
121 }
122 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000123 return default_val;
124}
125
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000126uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
127 uint64_t default_val)
128{
129 const uint64_t *cell64;
130 int length;
131
132 cell64 = fdt_getprop(blob, node, prop_name, &length);
133 if (!cell64 || length < sizeof(*cell64))
134 return default_val;
135
136 return fdt64_to_cpu(*cell64);
137}
138
Simon Glassf88fe2d2012-02-27 10:52:34 +0000139int fdtdec_get_is_enabled(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000140{
141 const char *cell;
142
Simon Glassf88fe2d2012-02-27 10:52:34 +0000143 /*
144 * It should say "okay", so only allow that. Some fdts use "ok" but
145 * this is a bug. Please fix your device tree source file. See here
146 * for discussion:
147 *
148 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
149 */
Simon Glassb5220bc2011-10-24 19:15:32 +0000150 cell = fdt_getprop(blob, node, "status", NULL);
151 if (cell)
Simon Glassf88fe2d2012-02-27 10:52:34 +0000152 return 0 == strcmp(cell, "okay");
153 return 1;
Simon Glassb5220bc2011-10-24 19:15:32 +0000154}
155
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500156enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000157{
158 enum fdt_compat_id id;
159
160 /* Search our drivers */
161 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
162 if (0 == fdt_node_check_compatible(blob, node,
163 compat_names[id]))
164 return id;
165 return COMPAT_UNKNOWN;
166}
167
168int fdtdec_next_compatible(const void *blob, int node,
169 enum fdt_compat_id id)
170{
171 return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
172}
173
Simon Glass3ddecfc2012-04-02 13:18:42 +0000174int fdtdec_next_compatible_subnode(const void *blob, int node,
175 enum fdt_compat_id id, int *depthp)
176{
177 do {
178 node = fdt_next_node(blob, node, depthp);
179 } while (*depthp > 1);
180
181 /* If this is a direct subnode, and compatible, return it */
182 if (*depthp == 1 && 0 == fdt_node_check_compatible(
183 blob, node, compat_names[id]))
184 return node;
185
186 return -FDT_ERR_NOTFOUND;
187}
188
Simon Glassb5220bc2011-10-24 19:15:32 +0000189int fdtdec_next_alias(const void *blob, const char *name,
190 enum fdt_compat_id id, int *upto)
191{
192#define MAX_STR_LEN 20
193 char str[MAX_STR_LEN + 20];
194 int node, err;
195
196 /* snprintf() is not available */
197 assert(strlen(name) < MAX_STR_LEN);
198 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
Simon Glass00878472012-10-31 14:02:42 +0000199 node = fdt_path_offset(blob, str);
Simon Glassb5220bc2011-10-24 19:15:32 +0000200 if (node < 0)
201 return node;
202 err = fdt_node_check_compatible(blob, node, compat_names[id]);
203 if (err < 0)
204 return err;
Simon Glassf88fe2d2012-02-27 10:52:34 +0000205 if (err)
206 return -FDT_ERR_NOTFOUND;
207 (*upto)++;
208 return node;
Simon Glassb5220bc2011-10-24 19:15:32 +0000209}
210
Simon Glassa53f4a22012-01-17 08:20:50 +0000211int fdtdec_find_aliases_for_id(const void *blob, const char *name,
212 enum fdt_compat_id id, int *node_list, int maxcount)
213{
Simon Glassc6782272012-02-03 15:13:53 +0000214 memset(node_list, '\0', sizeof(*node_list) * maxcount);
215
216 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
217}
218
219/* TODO: Can we tighten this code up a little? */
220int fdtdec_add_aliases_for_id(const void *blob, const char *name,
221 enum fdt_compat_id id, int *node_list, int maxcount)
222{
Simon Glassa53f4a22012-01-17 08:20:50 +0000223 int name_len = strlen(name);
224 int nodes[maxcount];
225 int num_found = 0;
226 int offset, node;
227 int alias_node;
228 int count;
229 int i, j;
230
231 /* find the alias node if present */
232 alias_node = fdt_path_offset(blob, "/aliases");
233
234 /*
235 * start with nothing, and we can assume that the root node can't
236 * match
237 */
238 memset(nodes, '\0', sizeof(nodes));
239
240 /* First find all the compatible nodes */
241 for (node = count = 0; node >= 0 && count < maxcount;) {
242 node = fdtdec_next_compatible(blob, node, id);
243 if (node >= 0)
244 nodes[count++] = node;
245 }
246 if (node >= 0)
247 debug("%s: warning: maxcount exceeded with alias '%s'\n",
248 __func__, name);
249
250 /* Now find all the aliases */
Simon Glassa53f4a22012-01-17 08:20:50 +0000251 for (offset = fdt_first_property_offset(blob, alias_node);
252 offset > 0;
253 offset = fdt_next_property_offset(blob, offset)) {
254 const struct fdt_property *prop;
255 const char *path;
256 int number;
257 int found;
258
259 node = 0;
260 prop = fdt_get_property_by_offset(blob, offset, NULL);
261 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
262 if (prop->len && 0 == strncmp(path, name, name_len))
263 node = fdt_path_offset(blob, prop->data);
264 if (node <= 0)
265 continue;
266
267 /* Get the alias number */
268 number = simple_strtoul(path + name_len, NULL, 10);
269 if (number < 0 || number >= maxcount) {
270 debug("%s: warning: alias '%s' is out of range\n",
271 __func__, path);
272 continue;
273 }
274
275 /* Make sure the node we found is actually in our list! */
276 found = -1;
277 for (j = 0; j < count; j++)
278 if (nodes[j] == node) {
279 found = j;
280 break;
281 }
282
283 if (found == -1) {
284 debug("%s: warning: alias '%s' points to a node "
285 "'%s' that is missing or is not compatible "
286 " with '%s'\n", __func__, path,
287 fdt_get_name(blob, node, NULL),
288 compat_names[id]);
289 continue;
290 }
291
292 /*
293 * Add this node to our list in the right place, and mark
294 * it as done.
295 */
296 if (fdtdec_get_is_enabled(blob, node)) {
Simon Glassc6782272012-02-03 15:13:53 +0000297 if (node_list[number]) {
298 debug("%s: warning: alias '%s' requires that "
299 "a node be placed in the list in a "
300 "position which is already filled by "
301 "node '%s'\n", __func__, path,
302 fdt_get_name(blob, node, NULL));
303 continue;
304 }
Simon Glassa53f4a22012-01-17 08:20:50 +0000305 node_list[number] = node;
306 if (number >= num_found)
307 num_found = number + 1;
308 }
Simon Glassc6782272012-02-03 15:13:53 +0000309 nodes[found] = 0;
Simon Glassa53f4a22012-01-17 08:20:50 +0000310 }
311
312 /* Add any nodes not mentioned by an alias */
313 for (i = j = 0; i < maxcount; i++) {
314 if (!node_list[i]) {
315 for (; j < maxcount; j++)
316 if (nodes[j] &&
317 fdtdec_get_is_enabled(blob, nodes[j]))
318 break;
319
320 /* Have we run out of nodes to add? */
321 if (j == maxcount)
322 break;
323
324 assert(!node_list[i]);
325 node_list[i] = nodes[j++];
326 if (i >= num_found)
327 num_found = i + 1;
328 }
329 }
330
331 return num_found;
332}
333
Simon Glass9a263e52012-03-28 10:08:24 +0000334int fdtdec_check_fdt(void)
335{
336 /*
337 * We must have an FDT, but we cannot panic() yet since the console
338 * is not ready. So for now, just assert(). Boards which need an early
339 * FDT (prior to console ready) will need to make their own
340 * arrangements and do their own checks.
341 */
342 assert(!fdtdec_prepare_fdt());
343 return 0;
344}
345
Simon Glassb5220bc2011-10-24 19:15:32 +0000346/*
347 * This function is a little odd in that it accesses global data. At some
348 * point if the architecture board.c files merge this will make more sense.
349 * Even now, it is common code.
350 */
Simon Glass9a263e52012-03-28 10:08:24 +0000351int fdtdec_prepare_fdt(void)
Simon Glassb5220bc2011-10-24 19:15:32 +0000352{
Simon Glassc309c2d2013-04-20 08:42:46 +0000353 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
354 fdt_check_header(gd->fdt_blob)) {
Simon Glass9a263e52012-03-28 10:08:24 +0000355 printf("No valid FDT found - please append one to U-Boot "
356 "binary, use u-boot-dtb.bin or define "
Simon Glassa733b062013-04-26 02:53:43 +0000357 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
Simon Glass9a263e52012-03-28 10:08:24 +0000358 return -1;
359 }
Simon Glassb5220bc2011-10-24 19:15:32 +0000360 return 0;
361}
Simon Glassd17da652012-02-27 10:52:35 +0000362
363int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
364{
365 const u32 *phandle;
366 int lookup;
367
Simon Glass1cb23232012-07-12 05:25:01 +0000368 debug("%s: %s\n", __func__, prop_name);
Simon Glassd17da652012-02-27 10:52:35 +0000369 phandle = fdt_getprop(blob, node, prop_name, NULL);
370 if (!phandle)
371 return -FDT_ERR_NOTFOUND;
372
373 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
374 return lookup;
375}
376
377/**
378 * Look up a property in a node and check that it has a minimum length.
379 *
380 * @param blob FDT blob
381 * @param node node to examine
382 * @param prop_name name of property to find
383 * @param min_len minimum property length in bytes
384 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
385 found, or -FDT_ERR_BADLAYOUT if not enough data
386 * @return pointer to cell, which is only valid if err == 0
387 */
388static const void *get_prop_check_min_len(const void *blob, int node,
389 const char *prop_name, int min_len, int *err)
390{
391 const void *cell;
392 int len;
393
394 debug("%s: %s\n", __func__, prop_name);
395 cell = fdt_getprop(blob, node, prop_name, &len);
396 if (!cell)
397 *err = -FDT_ERR_NOTFOUND;
398 else if (len < min_len)
399 *err = -FDT_ERR_BADLAYOUT;
400 else
401 *err = 0;
402 return cell;
403}
404
405int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
406 u32 *array, int count)
407{
408 const u32 *cell;
409 int i, err = 0;
410
411 debug("%s: %s\n", __func__, prop_name);
412 cell = get_prop_check_min_len(blob, node, prop_name,
413 sizeof(u32) * count, &err);
414 if (!err) {
415 for (i = 0; i < count; i++)
416 array[i] = fdt32_to_cpu(cell[i]);
417 }
418 return err;
419}
420
Simon Glass96875e72012-04-02 13:18:41 +0000421const u32 *fdtdec_locate_array(const void *blob, int node,
422 const char *prop_name, int count)
423{
424 const u32 *cell;
425 int err;
426
427 cell = get_prop_check_min_len(blob, node, prop_name,
428 sizeof(u32) * count, &err);
429 return err ? NULL : cell;
430}
431
Simon Glassd17da652012-02-27 10:52:35 +0000432int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
433{
434 const s32 *cell;
435 int len;
436
437 debug("%s: %s\n", __func__, prop_name);
438 cell = fdt_getprop(blob, node, prop_name, &len);
439 return cell != NULL;
440}
Simon Glassed3ee5c2012-02-27 10:52:36 +0000441
442/**
443 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
444 * terminating item.
445 *
446 * @param blob FDT blob to use
447 * @param node Node to look at
448 * @param prop_name Node property name
449 * @param gpio Array of gpio elements to fill from FDT. This will be
450 * untouched if either 0 or an error is returned
451 * @param max_count Maximum number of elements allowed
452 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
453 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
454 */
Abhilash Kesavan5921f6a2012-10-25 16:31:01 +0000455int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
456 struct fdt_gpio_state *gpio, int max_count)
Simon Glassed3ee5c2012-02-27 10:52:36 +0000457{
458 const struct fdt_property *prop;
459 const u32 *cell;
460 const char *name;
461 int len, i;
462
463 debug("%s: %s\n", __func__, prop_name);
464 assert(max_count > 0);
465 prop = fdt_get_property(blob, node, prop_name, &len);
466 if (!prop) {
Simon Glass1cb23232012-07-12 05:25:01 +0000467 debug("%s: property '%s' missing\n", __func__, prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000468 return -FDT_ERR_NOTFOUND;
469 }
470
471 /* We will use the name to tag the GPIO */
472 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
473 cell = (u32 *)prop->data;
474 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
475 if (len > max_count) {
Simon Glass1cb23232012-07-12 05:25:01 +0000476 debug(" %s: too many GPIOs / cells for "
Simon Glassed3ee5c2012-02-27 10:52:36 +0000477 "property '%s'\n", __func__, prop_name);
478 return -FDT_ERR_BADLAYOUT;
479 }
480
481 /* Read out the GPIO data from the cells */
482 for (i = 0; i < len; i++, cell += 3) {
483 gpio[i].gpio = fdt32_to_cpu(cell[1]);
484 gpio[i].flags = fdt32_to_cpu(cell[2]);
485 gpio[i].name = name;
486 }
487
488 return len;
489}
490
491int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
492 struct fdt_gpio_state *gpio)
493{
494 int err;
495
496 debug("%s: %s\n", __func__, prop_name);
497 gpio->gpio = FDT_GPIO_NONE;
498 gpio->name = NULL;
499 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
500 return err == 1 ? 0 : err;
501}
502
Sean Paul202ff752012-10-25 16:31:06 +0000503int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
504{
505 int val;
506
507 if (!fdt_gpio_isvalid(gpio))
508 return -1;
509
510 val = gpio_get_value(gpio->gpio);
511 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
512}
513
514int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
515{
516 if (!fdt_gpio_isvalid(gpio))
517 return -1;
518
519 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
520 return gpio_set_value(gpio->gpio, val);
521}
522
Simon Glassed3ee5c2012-02-27 10:52:36 +0000523int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
524{
525 /*
526 * Return success if there is no GPIO defined. This is used for
527 * optional GPIOs)
528 */
529 if (!fdt_gpio_isvalid(gpio))
530 return 0;
531
532 if (gpio_request(gpio->gpio, gpio->name))
533 return -1;
534 return 0;
535}
Anton Staffbed4d892012-04-17 09:01:28 +0000536
537int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
538 u8 *array, int count)
539{
540 const u8 *cell;
541 int err;
542
543 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
544 if (!err)
545 memcpy(array, cell, count);
546 return err;
547}
548
549const u8 *fdtdec_locate_byte_array(const void *blob, int node,
550 const char *prop_name, int count)
551{
552 const u8 *cell;
553 int err;
554
555 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
556 if (err)
557 return NULL;
558 return cell;
559}
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000560
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000561int fdtdec_get_config_int(const void *blob, const char *prop_name,
562 int default_val)
563{
564 int config_node;
565
566 debug("%s: %s\n", __func__, prop_name);
567 config_node = fdt_path_offset(blob, "/config");
568 if (config_node < 0)
569 return default_val;
570 return fdtdec_get_int(blob, config_node, prop_name, default_val);
571}
Simon Glass332ab0d2012-10-25 16:30:59 +0000572
Gabe Black79289c02012-10-25 16:31:04 +0000573int fdtdec_get_config_bool(const void *blob, const char *prop_name)
574{
575 int config_node;
576 const void *prop;
577
578 debug("%s: %s\n", __func__, prop_name);
579 config_node = fdt_path_offset(blob, "/config");
580 if (config_node < 0)
581 return 0;
582 prop = fdt_get_property(blob, config_node, prop_name, NULL);
583
584 return prop != NULL;
585}
586
Simon Glass332ab0d2012-10-25 16:30:59 +0000587char *fdtdec_get_config_string(const void *blob, const char *prop_name)
588{
589 const char *nodep;
590 int nodeoffset;
591 int len;
592
593 debug("%s: %s\n", __func__, prop_name);
594 nodeoffset = fdt_path_offset(blob, "/config");
595 if (nodeoffset < 0)
596 return NULL;
597
598 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
599 if (!nodep)
600 return NULL;
601
602 return (char *)nodep;
603}
Simon Glassf20c4612012-10-25 16:31:00 +0000604
605int fdtdec_decode_region(const void *blob, int node,
606 const char *prop_name, void **ptrp, size_t *size)
607{
608 const fdt_addr_t *cell;
609 int len;
610
611 debug("%s: %s\n", __func__, prop_name);
612 cell = fdt_getprop(blob, node, prop_name, &len);
613 if (!cell || (len != sizeof(fdt_addr_t) * 2))
614 return -1;
615
Simon Glass370b6c52013-11-10 10:26:54 -0700616 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
Simon Glassf20c4612012-10-25 16:31:00 +0000617 *size = fdt_size_to_cpu(cell[1]);
618 debug("%s: size=%zx\n", __func__, *size);
619 return 0;
620}