blob: f65ab4f58fffac63f04d0945dc41a9990d80b2d0 [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"),
Ajay Kumar1e4706a2013-02-21 23:53:05 +000055 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
Amar45a4d4d2013-04-27 11:42:52 +053056 COMPAT(SAMSUNG_EXYNOS5_DWMMC, "samsung,exynos5250-dwmmc"),
Rajeshwari Shindeee1e3c22013-06-24 16:47:20 +053057 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
Rajeshwari Shindecd577e22013-01-08 21:03:38 +000058 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
Simon Glassbb8215f2013-03-11 06:08:08 +000059 COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
Rajeshwari Shinde7772bb72013-02-14 19:46:15 +000060 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
Rong Changf6267992013-04-12 10:44:57 +000061 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
Vincent Palatinec34fa52013-04-12 11:04:36 +000062 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
naveen krishna chatradhiecbd7e12013-04-29 15:58:52 -070063 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
Simon Glassdf93d902014-02-27 13:26:12 -070064 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
Simon Glass7d95f2a2014-02-27 13:26:19 -070065 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
Simon Glassb5220bc2011-10-24 19:15:32 +000066};
67
Simon Glassa53f4a22012-01-17 08:20:50 +000068const char *fdtdec_get_compatible(enum fdt_compat_id id)
69{
70 /* We allow reading of the 'unknown' ID for testing purposes */
71 assert(id >= 0 && id < COMPAT_COUNT);
72 return compat_names[id];
73}
74
Simon Glass4397a2a2013-03-19 04:58:51 +000075fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
76 const char *prop_name, fdt_size_t *sizep)
Simon Glassb5220bc2011-10-24 19:15:32 +000077{
78 const fdt_addr_t *cell;
79 int len;
80
Simon Glass1cb23232012-07-12 05:25:01 +000081 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +000082 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass4397a2a2013-03-19 04:58:51 +000083 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
84 len == sizeof(fdt_addr_t) * 2)) {
Simon Glass1cb23232012-07-12 05:25:01 +000085 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
Simon Glass4397a2a2013-03-19 04:58:51 +000086 if (sizep) {
87 const fdt_size_t *size;
Simon Glass1cb23232012-07-12 05:25:01 +000088
Simon Glass4397a2a2013-03-19 04:58:51 +000089 size = (fdt_size_t *)((char *)cell +
90 sizeof(fdt_addr_t));
91 *sizep = fdt_size_to_cpu(*size);
Simon Glass370b6c52013-11-10 10:26:54 -070092 debug("addr=%08lx, size=%08x\n",
93 (ulong)addr, *sizep);
Simon Glass4397a2a2013-03-19 04:58:51 +000094 } else {
Simon Glass370b6c52013-11-10 10:26:54 -070095 debug("%08lx\n", (ulong)addr);
Simon Glass4397a2a2013-03-19 04:58:51 +000096 }
Simon Glass1cb23232012-07-12 05:25:01 +000097 return addr;
98 }
99 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000100 return FDT_ADDR_T_NONE;
101}
102
Simon Glass4397a2a2013-03-19 04:58:51 +0000103fdt_addr_t fdtdec_get_addr(const void *blob, int node,
104 const char *prop_name)
105{
106 return fdtdec_get_addr_size(blob, node, prop_name, NULL);
107}
108
Simon Glassb5220bc2011-10-24 19:15:32 +0000109s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
110 s32 default_val)
111{
112 const s32 *cell;
113 int len;
114
Simon Glass1cb23232012-07-12 05:25:01 +0000115 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +0000116 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass1cb23232012-07-12 05:25:01 +0000117 if (cell && len >= sizeof(s32)) {
118 s32 val = fdt32_to_cpu(cell[0]);
119
120 debug("%#x (%d)\n", val, val);
121 return val;
122 }
123 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000124 return default_val;
125}
126
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000127uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
128 uint64_t default_val)
129{
130 const uint64_t *cell64;
131 int length;
132
133 cell64 = fdt_getprop(blob, node, prop_name, &length);
134 if (!cell64 || length < sizeof(*cell64))
135 return default_val;
136
137 return fdt64_to_cpu(*cell64);
138}
139
Simon Glassf88fe2d2012-02-27 10:52:34 +0000140int fdtdec_get_is_enabled(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000141{
142 const char *cell;
143
Simon Glassf88fe2d2012-02-27 10:52:34 +0000144 /*
145 * It should say "okay", so only allow that. Some fdts use "ok" but
146 * this is a bug. Please fix your device tree source file. See here
147 * for discussion:
148 *
149 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
150 */
Simon Glassb5220bc2011-10-24 19:15:32 +0000151 cell = fdt_getprop(blob, node, "status", NULL);
152 if (cell)
Simon Glassf88fe2d2012-02-27 10:52:34 +0000153 return 0 == strcmp(cell, "okay");
154 return 1;
Simon Glassb5220bc2011-10-24 19:15:32 +0000155}
156
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500157enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000158{
159 enum fdt_compat_id id;
160
161 /* Search our drivers */
162 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
163 if (0 == fdt_node_check_compatible(blob, node,
164 compat_names[id]))
165 return id;
166 return COMPAT_UNKNOWN;
167}
168
169int fdtdec_next_compatible(const void *blob, int node,
170 enum fdt_compat_id id)
171{
172 return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
173}
174
Simon Glass3ddecfc2012-04-02 13:18:42 +0000175int fdtdec_next_compatible_subnode(const void *blob, int node,
176 enum fdt_compat_id id, int *depthp)
177{
178 do {
179 node = fdt_next_node(blob, node, depthp);
180 } while (*depthp > 1);
181
182 /* If this is a direct subnode, and compatible, return it */
183 if (*depthp == 1 && 0 == fdt_node_check_compatible(
184 blob, node, compat_names[id]))
185 return node;
186
187 return -FDT_ERR_NOTFOUND;
188}
189
Simon Glassb5220bc2011-10-24 19:15:32 +0000190int fdtdec_next_alias(const void *blob, const char *name,
191 enum fdt_compat_id id, int *upto)
192{
193#define MAX_STR_LEN 20
194 char str[MAX_STR_LEN + 20];
195 int node, err;
196
197 /* snprintf() is not available */
198 assert(strlen(name) < MAX_STR_LEN);
199 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
Simon Glass00878472012-10-31 14:02:42 +0000200 node = fdt_path_offset(blob, str);
Simon Glassb5220bc2011-10-24 19:15:32 +0000201 if (node < 0)
202 return node;
203 err = fdt_node_check_compatible(blob, node, compat_names[id]);
204 if (err < 0)
205 return err;
Simon Glassf88fe2d2012-02-27 10:52:34 +0000206 if (err)
207 return -FDT_ERR_NOTFOUND;
208 (*upto)++;
209 return node;
Simon Glassb5220bc2011-10-24 19:15:32 +0000210}
211
Simon Glassa53f4a22012-01-17 08:20:50 +0000212int fdtdec_find_aliases_for_id(const void *blob, const char *name,
213 enum fdt_compat_id id, int *node_list, int maxcount)
214{
Simon Glassc6782272012-02-03 15:13:53 +0000215 memset(node_list, '\0', sizeof(*node_list) * maxcount);
216
217 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
218}
219
220/* TODO: Can we tighten this code up a little? */
221int fdtdec_add_aliases_for_id(const void *blob, const char *name,
222 enum fdt_compat_id id, int *node_list, int maxcount)
223{
Simon Glassa53f4a22012-01-17 08:20:50 +0000224 int name_len = strlen(name);
225 int nodes[maxcount];
226 int num_found = 0;
227 int offset, node;
228 int alias_node;
229 int count;
230 int i, j;
231
232 /* find the alias node if present */
233 alias_node = fdt_path_offset(blob, "/aliases");
234
235 /*
236 * start with nothing, and we can assume that the root node can't
237 * match
238 */
239 memset(nodes, '\0', sizeof(nodes));
240
241 /* First find all the compatible nodes */
242 for (node = count = 0; node >= 0 && count < maxcount;) {
243 node = fdtdec_next_compatible(blob, node, id);
244 if (node >= 0)
245 nodes[count++] = node;
246 }
247 if (node >= 0)
248 debug("%s: warning: maxcount exceeded with alias '%s'\n",
249 __func__, name);
250
251 /* Now find all the aliases */
Simon Glassa53f4a22012-01-17 08:20:50 +0000252 for (offset = fdt_first_property_offset(blob, alias_node);
253 offset > 0;
254 offset = fdt_next_property_offset(blob, offset)) {
255 const struct fdt_property *prop;
256 const char *path;
257 int number;
258 int found;
259
260 node = 0;
261 prop = fdt_get_property_by_offset(blob, offset, NULL);
262 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
263 if (prop->len && 0 == strncmp(path, name, name_len))
264 node = fdt_path_offset(blob, prop->data);
265 if (node <= 0)
266 continue;
267
268 /* Get the alias number */
269 number = simple_strtoul(path + name_len, NULL, 10);
270 if (number < 0 || number >= maxcount) {
271 debug("%s: warning: alias '%s' is out of range\n",
272 __func__, path);
273 continue;
274 }
275
276 /* Make sure the node we found is actually in our list! */
277 found = -1;
278 for (j = 0; j < count; j++)
279 if (nodes[j] == node) {
280 found = j;
281 break;
282 }
283
284 if (found == -1) {
285 debug("%s: warning: alias '%s' points to a node "
286 "'%s' that is missing or is not compatible "
287 " with '%s'\n", __func__, path,
288 fdt_get_name(blob, node, NULL),
289 compat_names[id]);
290 continue;
291 }
292
293 /*
294 * Add this node to our list in the right place, and mark
295 * it as done.
296 */
297 if (fdtdec_get_is_enabled(blob, node)) {
Simon Glassc6782272012-02-03 15:13:53 +0000298 if (node_list[number]) {
299 debug("%s: warning: alias '%s' requires that "
300 "a node be placed in the list in a "
301 "position which is already filled by "
302 "node '%s'\n", __func__, path,
303 fdt_get_name(blob, node, NULL));
304 continue;
305 }
Simon Glassa53f4a22012-01-17 08:20:50 +0000306 node_list[number] = node;
307 if (number >= num_found)
308 num_found = number + 1;
309 }
Simon Glassc6782272012-02-03 15:13:53 +0000310 nodes[found] = 0;
Simon Glassa53f4a22012-01-17 08:20:50 +0000311 }
312
313 /* Add any nodes not mentioned by an alias */
314 for (i = j = 0; i < maxcount; i++) {
315 if (!node_list[i]) {
316 for (; j < maxcount; j++)
317 if (nodes[j] &&
318 fdtdec_get_is_enabled(blob, nodes[j]))
319 break;
320
321 /* Have we run out of nodes to add? */
322 if (j == maxcount)
323 break;
324
325 assert(!node_list[i]);
326 node_list[i] = nodes[j++];
327 if (i >= num_found)
328 num_found = i + 1;
329 }
330 }
331
332 return num_found;
333}
334
Simon Glass9a263e52012-03-28 10:08:24 +0000335int fdtdec_check_fdt(void)
336{
337 /*
338 * We must have an FDT, but we cannot panic() yet since the console
339 * is not ready. So for now, just assert(). Boards which need an early
340 * FDT (prior to console ready) will need to make their own
341 * arrangements and do their own checks.
342 */
343 assert(!fdtdec_prepare_fdt());
344 return 0;
345}
346
Simon Glassb5220bc2011-10-24 19:15:32 +0000347/*
348 * This function is a little odd in that it accesses global data. At some
349 * point if the architecture board.c files merge this will make more sense.
350 * Even now, it is common code.
351 */
Simon Glass9a263e52012-03-28 10:08:24 +0000352int fdtdec_prepare_fdt(void)
Simon Glassb5220bc2011-10-24 19:15:32 +0000353{
Simon Glassc309c2d2013-04-20 08:42:46 +0000354 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
355 fdt_check_header(gd->fdt_blob)) {
Simon Glass9a263e52012-03-28 10:08:24 +0000356 printf("No valid FDT found - please append one to U-Boot "
357 "binary, use u-boot-dtb.bin or define "
Simon Glassa733b062013-04-26 02:53:43 +0000358 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
Simon Glass9a263e52012-03-28 10:08:24 +0000359 return -1;
360 }
Simon Glassb5220bc2011-10-24 19:15:32 +0000361 return 0;
362}
Simon Glassd17da652012-02-27 10:52:35 +0000363
364int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
365{
366 const u32 *phandle;
367 int lookup;
368
Simon Glass1cb23232012-07-12 05:25:01 +0000369 debug("%s: %s\n", __func__, prop_name);
Simon Glassd17da652012-02-27 10:52:35 +0000370 phandle = fdt_getprop(blob, node, prop_name, NULL);
371 if (!phandle)
372 return -FDT_ERR_NOTFOUND;
373
374 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
375 return lookup;
376}
377
378/**
379 * Look up a property in a node and check that it has a minimum length.
380 *
381 * @param blob FDT blob
382 * @param node node to examine
383 * @param prop_name name of property to find
384 * @param min_len minimum property length in bytes
385 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
386 found, or -FDT_ERR_BADLAYOUT if not enough data
387 * @return pointer to cell, which is only valid if err == 0
388 */
389static const void *get_prop_check_min_len(const void *blob, int node,
390 const char *prop_name, int min_len, int *err)
391{
392 const void *cell;
393 int len;
394
395 debug("%s: %s\n", __func__, prop_name);
396 cell = fdt_getprop(blob, node, prop_name, &len);
397 if (!cell)
398 *err = -FDT_ERR_NOTFOUND;
399 else if (len < min_len)
400 *err = -FDT_ERR_BADLAYOUT;
401 else
402 *err = 0;
403 return cell;
404}
405
406int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
407 u32 *array, int count)
408{
409 const u32 *cell;
410 int i, err = 0;
411
412 debug("%s: %s\n", __func__, prop_name);
413 cell = get_prop_check_min_len(blob, node, prop_name,
414 sizeof(u32) * count, &err);
415 if (!err) {
416 for (i = 0; i < count; i++)
417 array[i] = fdt32_to_cpu(cell[i]);
418 }
419 return err;
420}
421
Simon Glass96875e72012-04-02 13:18:41 +0000422const u32 *fdtdec_locate_array(const void *blob, int node,
423 const char *prop_name, int count)
424{
425 const u32 *cell;
426 int err;
427
428 cell = get_prop_check_min_len(blob, node, prop_name,
429 sizeof(u32) * count, &err);
430 return err ? NULL : cell;
431}
432
Simon Glassd17da652012-02-27 10:52:35 +0000433int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
434{
435 const s32 *cell;
436 int len;
437
438 debug("%s: %s\n", __func__, prop_name);
439 cell = fdt_getprop(blob, node, prop_name, &len);
440 return cell != NULL;
441}
Simon Glassed3ee5c2012-02-27 10:52:36 +0000442
443/**
444 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
445 * terminating item.
446 *
447 * @param blob FDT blob to use
448 * @param node Node to look at
449 * @param prop_name Node property name
450 * @param gpio Array of gpio elements to fill from FDT. This will be
451 * untouched if either 0 or an error is returned
452 * @param max_count Maximum number of elements allowed
453 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
454 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
455 */
Abhilash Kesavan5921f6a2012-10-25 16:31:01 +0000456int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
457 struct fdt_gpio_state *gpio, int max_count)
Simon Glassed3ee5c2012-02-27 10:52:36 +0000458{
459 const struct fdt_property *prop;
460 const u32 *cell;
461 const char *name;
462 int len, i;
463
464 debug("%s: %s\n", __func__, prop_name);
465 assert(max_count > 0);
466 prop = fdt_get_property(blob, node, prop_name, &len);
467 if (!prop) {
Simon Glass1cb23232012-07-12 05:25:01 +0000468 debug("%s: property '%s' missing\n", __func__, prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000469 return -FDT_ERR_NOTFOUND;
470 }
471
472 /* We will use the name to tag the GPIO */
473 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
474 cell = (u32 *)prop->data;
475 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
476 if (len > max_count) {
Simon Glass1cb23232012-07-12 05:25:01 +0000477 debug(" %s: too many GPIOs / cells for "
Simon Glassed3ee5c2012-02-27 10:52:36 +0000478 "property '%s'\n", __func__, prop_name);
479 return -FDT_ERR_BADLAYOUT;
480 }
481
482 /* Read out the GPIO data from the cells */
483 for (i = 0; i < len; i++, cell += 3) {
484 gpio[i].gpio = fdt32_to_cpu(cell[1]);
485 gpio[i].flags = fdt32_to_cpu(cell[2]);
486 gpio[i].name = name;
487 }
488
489 return len;
490}
491
492int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
493 struct fdt_gpio_state *gpio)
494{
495 int err;
496
497 debug("%s: %s\n", __func__, prop_name);
498 gpio->gpio = FDT_GPIO_NONE;
499 gpio->name = NULL;
500 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
501 return err == 1 ? 0 : err;
502}
503
Sean Paul202ff752012-10-25 16:31:06 +0000504int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
505{
506 int val;
507
508 if (!fdt_gpio_isvalid(gpio))
509 return -1;
510
511 val = gpio_get_value(gpio->gpio);
512 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
513}
514
515int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
516{
517 if (!fdt_gpio_isvalid(gpio))
518 return -1;
519
520 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
521 return gpio_set_value(gpio->gpio, val);
522}
523
Simon Glassed3ee5c2012-02-27 10:52:36 +0000524int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
525{
526 /*
527 * Return success if there is no GPIO defined. This is used for
528 * optional GPIOs)
529 */
530 if (!fdt_gpio_isvalid(gpio))
531 return 0;
532
533 if (gpio_request(gpio->gpio, gpio->name))
534 return -1;
535 return 0;
536}
Anton Staffbed4d892012-04-17 09:01:28 +0000537
538int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
539 u8 *array, int count)
540{
541 const u8 *cell;
542 int err;
543
544 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
545 if (!err)
546 memcpy(array, cell, count);
547 return err;
548}
549
550const u8 *fdtdec_locate_byte_array(const void *blob, int node,
551 const char *prop_name, int count)
552{
553 const u8 *cell;
554 int err;
555
556 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
557 if (err)
558 return NULL;
559 return cell;
560}
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000561
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000562int fdtdec_get_config_int(const void *blob, const char *prop_name,
563 int default_val)
564{
565 int config_node;
566
567 debug("%s: %s\n", __func__, prop_name);
568 config_node = fdt_path_offset(blob, "/config");
569 if (config_node < 0)
570 return default_val;
571 return fdtdec_get_int(blob, config_node, prop_name, default_val);
572}
Simon Glass332ab0d2012-10-25 16:30:59 +0000573
Gabe Black79289c02012-10-25 16:31:04 +0000574int fdtdec_get_config_bool(const void *blob, const char *prop_name)
575{
576 int config_node;
577 const void *prop;
578
579 debug("%s: %s\n", __func__, prop_name);
580 config_node = fdt_path_offset(blob, "/config");
581 if (config_node < 0)
582 return 0;
583 prop = fdt_get_property(blob, config_node, prop_name, NULL);
584
585 return prop != NULL;
586}
587
Simon Glass332ab0d2012-10-25 16:30:59 +0000588char *fdtdec_get_config_string(const void *blob, const char *prop_name)
589{
590 const char *nodep;
591 int nodeoffset;
592 int len;
593
594 debug("%s: %s\n", __func__, prop_name);
595 nodeoffset = fdt_path_offset(blob, "/config");
596 if (nodeoffset < 0)
597 return NULL;
598
599 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
600 if (!nodep)
601 return NULL;
602
603 return (char *)nodep;
604}
Simon Glassf20c4612012-10-25 16:31:00 +0000605
606int fdtdec_decode_region(const void *blob, int node,
607 const char *prop_name, void **ptrp, size_t *size)
608{
609 const fdt_addr_t *cell;
610 int len;
611
612 debug("%s: %s\n", __func__, prop_name);
613 cell = fdt_getprop(blob, node, prop_name, &len);
614 if (!cell || (len != sizeof(fdt_addr_t) * 2))
615 return -1;
616
Simon Glass370b6c52013-11-10 10:26:54 -0700617 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
Simon Glassf20c4612012-10-25 16:31:00 +0000618 *size = fdt_size_to_cpu(cell[1]);
619 debug("%s: size=%zx\n", __func__, *size);
620 return 0;
621}
Simon Glass006e73b2014-02-27 13:26:01 -0700622
623/**
624 * Read a flash entry from the fdt
625 *
626 * @param blob FDT blob
627 * @param node Offset of node to read
628 * @param name Name of node being read
629 * @param entry Place to put offset and size of this node
630 * @return 0 if ok, -ve on error
631 */
632int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
633 struct fmap_entry *entry)
634{
635 u32 reg[2];
636
637 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
638 debug("Node '%s' has bad/missing 'reg' property\n", name);
639 return -FDT_ERR_NOTFOUND;
640 }
641 entry->offset = reg[0];
642 entry->length = reg[1];
643
644 return 0;
645}