blob: 9714620ab3e211df006d440dc4f1abb6d03bb9b8 [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
Heiko Schocher29a23f92014-03-03 12:19:30 +01006#ifndef USE_HOSTCC
Simon Glassb5220bc2011-10-24 19:15:32 +00007#include <common.h>
Simon Glass5c33c9f2014-07-23 06:55:09 -06008#include <errno.h>
Simon Glassb5220bc2011-10-24 19:15:32 +00009#include <serial.h>
10#include <libfdt.h>
11#include <fdtdec.h>
Simon Glass5c33c9f2014-07-23 06:55:09 -060012#include <linux/ctype.h>
Simon Glassb5220bc2011-10-24 19:15:32 +000013
Michal Simeke46431e2012-07-11 02:26:38 +000014#include <asm/gpio.h>
Simon Glassed3ee5c2012-02-27 10:52:36 +000015
Simon Glassb5220bc2011-10-24 19:15:32 +000016DECLARE_GLOBAL_DATA_PTR;
17
18/*
19 * Here are the type we know about. One day we might allow drivers to
20 * register. For now we just put them here. The COMPAT macro allows us to
21 * turn this into a sparse list later, and keeps the ID with the name.
22 */
23#define COMPAT(id, name) name
24static const char * const compat_names[COMPAT_COUNT] = {
Simon Glassf88fe2d2012-02-27 10:52:34 +000025 COMPAT(UNKNOWN, "<none>"),
Simon Glass87f938c2012-02-27 10:52:49 +000026 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
Jim Lin7e44d932013-06-21 19:05:47 +080027 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"),
28 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"),
Tom Warrene32624e2013-02-08 07:25:30 +000029 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
Yen Lin96a78ac2012-03-06 19:00:23 +000030 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
31 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
Jimmy Zhang0e35ad02012-04-02 13:18:52 +000032 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
33 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
Rakesh Iyer6642a682012-04-17 09:01:35 +000034 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
Jim Lin312693c2012-07-29 20:53:29 +000035 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
Simon Glasse1ae0d12012-10-17 13:24:49 +000036 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
Wei Ni87540de2012-10-17 13:24:50 +000037 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
Stephen Warrena73ca472014-01-24 12:46:06 -070038 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
Tom Warrenf4e4e0b2013-03-04 14:07:18 -070039 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
Tom Warrenc9aa8312013-02-21 12:31:30 +000040 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
Allen Martin8f1b46b2013-01-29 13:51:24 +000041 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
Allen Martinb19f5742013-01-29 13:51:28 +000042 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
Allen Martinc3bb3c82013-03-16 18:58:09 +000043 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
Hatim RVcc9fe332012-12-11 00:52:46 +000044 COMPAT(SMSC_LAN9215, "smsc,lan9215"),
45 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
Rajeshwari Shindec34253d2012-12-26 20:03:10 +000046 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
Rajeshwari Shinde72dbff12012-12-26 20:03:16 +000047 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
48 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
Rajeshwari Shinde5d506592012-12-26 20:03:20 +000049 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
Hung-ying Tyan88364382013-05-15 18:27:28 +080050 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
Hung-ying Tyan713cb682013-05-15 18:27:32 +080051 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000052 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
Vivek Gautam108b85b2013-09-14 14:02:48 +053053 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"),
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000054 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
Vivek Gautam108b85b2013-09-14 14:02:48 +053055 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
Akshay Saraswat618766c2013-02-25 01:13:01 +000056 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
Ajay Kumard7377b52013-02-21 23:53:00 +000057 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
Piotr Wilczekde461c52014-03-07 14:59:39 +010058 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
Ajay Kumar1e4706a2013-02-21 23:53:05 +000059 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
Jaehoon Chung7d3ca0f2014-05-16 13:59:51 +090060 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
Piotr Wilczek3577fe82014-03-07 14:59:41 +010061 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
Rajeshwari Shindeee1e3c22013-06-24 16:47:20 +053062 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
Rajeshwari Shindecd577e22013-01-08 21:03:38 +000063 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
Simon Glassbb8215f2013-03-11 06:08:08 +000064 COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
Rajeshwari Shinde7772bb72013-02-14 19:46:15 +000065 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
Rong Changf6267992013-04-12 10:44:57 +000066 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
Vincent Palatinec34fa52013-04-12 11:04:36 +000067 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
naveen krishna chatradhiecbd7e12013-04-29 15:58:52 -070068 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
Simon Glassdf93d902014-02-27 13:26:12 -070069 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
Simon Glass7d95f2a2014-02-27 13:26:19 -070070 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
Tom Wai-Hong Tamac1058f2014-05-20 06:01:36 -060071 COMPAT(TI_TPS65090, "ti,tps65090"),
Simon Glassa9cf6da2014-05-20 06:01:42 -060072 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"),
Ajay Kumar45c480c2014-09-05 16:53:33 +053073 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
Vadim Bendebury9e8f6642014-09-05 16:53:34 +053074 COMPAT(PARADE_PS8625, "parade,ps8625"),
Simon Glassca42d3f2014-10-10 07:30:14 -060075 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"),
Simon Glassb5220bc2011-10-24 19:15:32 +000076};
77
Simon Glassa53f4a22012-01-17 08:20:50 +000078const char *fdtdec_get_compatible(enum fdt_compat_id id)
79{
80 /* We allow reading of the 'unknown' ID for testing purposes */
81 assert(id >= 0 && id < COMPAT_COUNT);
82 return compat_names[id];
83}
84
Simon Glass4397a2a2013-03-19 04:58:51 +000085fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
86 const char *prop_name, fdt_size_t *sizep)
Simon Glassb5220bc2011-10-24 19:15:32 +000087{
88 const fdt_addr_t *cell;
89 int len;
90
Simon Glass1cb23232012-07-12 05:25:01 +000091 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +000092 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass4397a2a2013-03-19 04:58:51 +000093 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
94 len == sizeof(fdt_addr_t) * 2)) {
Simon Glass1cb23232012-07-12 05:25:01 +000095 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
Simon Glass4397a2a2013-03-19 04:58:51 +000096 if (sizep) {
97 const fdt_size_t *size;
Simon Glass1cb23232012-07-12 05:25:01 +000098
Simon Glass4397a2a2013-03-19 04:58:51 +000099 size = (fdt_size_t *)((char *)cell +
100 sizeof(fdt_addr_t));
101 *sizep = fdt_size_to_cpu(*size);
Simon Glass370b6c52013-11-10 10:26:54 -0700102 debug("addr=%08lx, size=%08x\n",
103 (ulong)addr, *sizep);
Simon Glass4397a2a2013-03-19 04:58:51 +0000104 } else {
Simon Glass370b6c52013-11-10 10:26:54 -0700105 debug("%08lx\n", (ulong)addr);
Simon Glass4397a2a2013-03-19 04:58:51 +0000106 }
Simon Glass1cb23232012-07-12 05:25:01 +0000107 return addr;
108 }
109 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000110 return FDT_ADDR_T_NONE;
111}
112
Simon Glass4397a2a2013-03-19 04:58:51 +0000113fdt_addr_t fdtdec_get_addr(const void *blob, int node,
114 const char *prop_name)
115{
116 return fdtdec_get_addr_size(blob, node, prop_name, NULL);
117}
118
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000119uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
120 uint64_t default_val)
121{
122 const uint64_t *cell64;
123 int length;
124
125 cell64 = fdt_getprop(blob, node, prop_name, &length);
126 if (!cell64 || length < sizeof(*cell64))
127 return default_val;
128
129 return fdt64_to_cpu(*cell64);
130}
131
Simon Glassf88fe2d2012-02-27 10:52:34 +0000132int fdtdec_get_is_enabled(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000133{
134 const char *cell;
135
Simon Glassf88fe2d2012-02-27 10:52:34 +0000136 /*
137 * It should say "okay", so only allow that. Some fdts use "ok" but
138 * this is a bug. Please fix your device tree source file. See here
139 * for discussion:
140 *
141 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
142 */
Simon Glassb5220bc2011-10-24 19:15:32 +0000143 cell = fdt_getprop(blob, node, "status", NULL);
144 if (cell)
Simon Glassf88fe2d2012-02-27 10:52:34 +0000145 return 0 == strcmp(cell, "okay");
146 return 1;
Simon Glassb5220bc2011-10-24 19:15:32 +0000147}
148
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500149enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000150{
151 enum fdt_compat_id id;
152
153 /* Search our drivers */
154 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
155 if (0 == fdt_node_check_compatible(blob, node,
156 compat_names[id]))
157 return id;
158 return COMPAT_UNKNOWN;
159}
160
161int fdtdec_next_compatible(const void *blob, int node,
162 enum fdt_compat_id id)
163{
164 return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
165}
166
Simon Glass3ddecfc2012-04-02 13:18:42 +0000167int fdtdec_next_compatible_subnode(const void *blob, int node,
168 enum fdt_compat_id id, int *depthp)
169{
170 do {
171 node = fdt_next_node(blob, node, depthp);
172 } while (*depthp > 1);
173
174 /* If this is a direct subnode, and compatible, return it */
175 if (*depthp == 1 && 0 == fdt_node_check_compatible(
176 blob, node, compat_names[id]))
177 return node;
178
179 return -FDT_ERR_NOTFOUND;
180}
181
Simon Glassb5220bc2011-10-24 19:15:32 +0000182int fdtdec_next_alias(const void *blob, const char *name,
183 enum fdt_compat_id id, int *upto)
184{
185#define MAX_STR_LEN 20
186 char str[MAX_STR_LEN + 20];
187 int node, err;
188
189 /* snprintf() is not available */
190 assert(strlen(name) < MAX_STR_LEN);
191 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
Simon Glass00878472012-10-31 14:02:42 +0000192 node = fdt_path_offset(blob, str);
Simon Glassb5220bc2011-10-24 19:15:32 +0000193 if (node < 0)
194 return node;
195 err = fdt_node_check_compatible(blob, node, compat_names[id]);
196 if (err < 0)
197 return err;
Simon Glassf88fe2d2012-02-27 10:52:34 +0000198 if (err)
199 return -FDT_ERR_NOTFOUND;
200 (*upto)++;
201 return node;
Simon Glassb5220bc2011-10-24 19:15:32 +0000202}
203
Simon Glassa53f4a22012-01-17 08:20:50 +0000204int fdtdec_find_aliases_for_id(const void *blob, const char *name,
205 enum fdt_compat_id id, int *node_list, int maxcount)
206{
Simon Glassc6782272012-02-03 15:13:53 +0000207 memset(node_list, '\0', sizeof(*node_list) * maxcount);
208
209 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
210}
211
212/* TODO: Can we tighten this code up a little? */
213int fdtdec_add_aliases_for_id(const void *blob, const char *name,
214 enum fdt_compat_id id, int *node_list, int maxcount)
215{
Simon Glassa53f4a22012-01-17 08:20:50 +0000216 int name_len = strlen(name);
217 int nodes[maxcount];
218 int num_found = 0;
219 int offset, node;
220 int alias_node;
221 int count;
222 int i, j;
223
224 /* find the alias node if present */
225 alias_node = fdt_path_offset(blob, "/aliases");
226
227 /*
228 * start with nothing, and we can assume that the root node can't
229 * match
230 */
231 memset(nodes, '\0', sizeof(nodes));
232
233 /* First find all the compatible nodes */
234 for (node = count = 0; node >= 0 && count < maxcount;) {
235 node = fdtdec_next_compatible(blob, node, id);
236 if (node >= 0)
237 nodes[count++] = node;
238 }
239 if (node >= 0)
240 debug("%s: warning: maxcount exceeded with alias '%s'\n",
241 __func__, name);
242
243 /* Now find all the aliases */
Simon Glassa53f4a22012-01-17 08:20:50 +0000244 for (offset = fdt_first_property_offset(blob, alias_node);
245 offset > 0;
246 offset = fdt_next_property_offset(blob, offset)) {
247 const struct fdt_property *prop;
248 const char *path;
249 int number;
250 int found;
251
252 node = 0;
253 prop = fdt_get_property_by_offset(blob, offset, NULL);
254 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
255 if (prop->len && 0 == strncmp(path, name, name_len))
256 node = fdt_path_offset(blob, prop->data);
257 if (node <= 0)
258 continue;
259
260 /* Get the alias number */
261 number = simple_strtoul(path + name_len, NULL, 10);
262 if (number < 0 || number >= maxcount) {
263 debug("%s: warning: alias '%s' is out of range\n",
264 __func__, path);
265 continue;
266 }
267
268 /* Make sure the node we found is actually in our list! */
269 found = -1;
270 for (j = 0; j < count; j++)
271 if (nodes[j] == node) {
272 found = j;
273 break;
274 }
275
276 if (found == -1) {
277 debug("%s: warning: alias '%s' points to a node "
278 "'%s' that is missing or is not compatible "
279 " with '%s'\n", __func__, path,
280 fdt_get_name(blob, node, NULL),
281 compat_names[id]);
282 continue;
283 }
284
285 /*
286 * Add this node to our list in the right place, and mark
287 * it as done.
288 */
289 if (fdtdec_get_is_enabled(blob, node)) {
Simon Glassc6782272012-02-03 15:13:53 +0000290 if (node_list[number]) {
291 debug("%s: warning: alias '%s' requires that "
292 "a node be placed in the list in a "
293 "position which is already filled by "
294 "node '%s'\n", __func__, path,
295 fdt_get_name(blob, node, NULL));
296 continue;
297 }
Simon Glassa53f4a22012-01-17 08:20:50 +0000298 node_list[number] = node;
299 if (number >= num_found)
300 num_found = number + 1;
301 }
Simon Glassc6782272012-02-03 15:13:53 +0000302 nodes[found] = 0;
Simon Glassa53f4a22012-01-17 08:20:50 +0000303 }
304
305 /* Add any nodes not mentioned by an alias */
306 for (i = j = 0; i < maxcount; i++) {
307 if (!node_list[i]) {
308 for (; j < maxcount; j++)
309 if (nodes[j] &&
310 fdtdec_get_is_enabled(blob, nodes[j]))
311 break;
312
313 /* Have we run out of nodes to add? */
314 if (j == maxcount)
315 break;
316
317 assert(!node_list[i]);
318 node_list[i] = nodes[j++];
319 if (i >= num_found)
320 num_found = i + 1;
321 }
322 }
323
324 return num_found;
325}
326
Simon Glass5c33c9f2014-07-23 06:55:09 -0600327int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
328 int *seqp)
329{
330 int base_len = strlen(base);
331 const char *find_name;
332 int find_namelen;
333 int prop_offset;
334 int aliases;
335
336 find_name = fdt_get_name(blob, offset, &find_namelen);
337 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
338
339 aliases = fdt_path_offset(blob, "/aliases");
340 for (prop_offset = fdt_first_property_offset(blob, aliases);
341 prop_offset > 0;
342 prop_offset = fdt_next_property_offset(blob, prop_offset)) {
343 const char *prop;
344 const char *name;
345 const char *slash;
346 const char *p;
347 int len;
348
349 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
350 debug(" - %s, %s\n", name, prop);
351 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
352 strncmp(name, base, base_len))
353 continue;
354
355 slash = strrchr(prop, '/');
356 if (strcmp(slash + 1, find_name))
357 continue;
358 for (p = name; *p; p++) {
359 if (isdigit(*p)) {
360 *seqp = simple_strtoul(p, NULL, 10);
361 debug("Found seq %d\n", *seqp);
362 return 0;
363 }
364 }
365 }
366
367 debug("Not found\n");
368 return -ENOENT;
369}
370
Simon Glass3234aa42014-07-23 06:55:16 -0600371int fdtdec_get_alias_node(const void *blob, const char *name)
372{
373 const char *prop;
374 int alias_node;
375 int len;
376
377 if (!blob)
378 return -FDT_ERR_NOTFOUND;
379 alias_node = fdt_path_offset(blob, "/aliases");
380 prop = fdt_getprop(blob, alias_node, name, &len);
381 if (!prop)
382 return -FDT_ERR_NOTFOUND;
383 return fdt_path_offset(blob, prop);
384}
385
Simon Glassaac07d42014-09-04 16:27:24 -0600386int fdtdec_get_chosen_node(const void *blob, const char *name)
387{
388 const char *prop;
389 int chosen_node;
390 int len;
391
392 if (!blob)
393 return -FDT_ERR_NOTFOUND;
394 chosen_node = fdt_path_offset(blob, "/chosen");
395 prop = fdt_getprop(blob, chosen_node, name, &len);
396 if (!prop)
397 return -FDT_ERR_NOTFOUND;
398 return fdt_path_offset(blob, prop);
399}
400
Simon Glass9a263e52012-03-28 10:08:24 +0000401int fdtdec_check_fdt(void)
402{
403 /*
404 * We must have an FDT, but we cannot panic() yet since the console
405 * is not ready. So for now, just assert(). Boards which need an early
406 * FDT (prior to console ready) will need to make their own
407 * arrangements and do their own checks.
408 */
409 assert(!fdtdec_prepare_fdt());
410 return 0;
411}
412
Simon Glassb5220bc2011-10-24 19:15:32 +0000413/*
414 * This function is a little odd in that it accesses global data. At some
415 * point if the architecture board.c files merge this will make more sense.
416 * Even now, it is common code.
417 */
Simon Glass9a263e52012-03-28 10:08:24 +0000418int fdtdec_prepare_fdt(void)
Simon Glassb5220bc2011-10-24 19:15:32 +0000419{
Simon Glassc309c2d2013-04-20 08:42:46 +0000420 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
421 fdt_check_header(gd->fdt_blob)) {
Simon Glass9a263e52012-03-28 10:08:24 +0000422 printf("No valid FDT found - please append one to U-Boot "
423 "binary, use u-boot-dtb.bin or define "
Simon Glassa733b062013-04-26 02:53:43 +0000424 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
Simon Glass9a263e52012-03-28 10:08:24 +0000425 return -1;
426 }
Simon Glassb5220bc2011-10-24 19:15:32 +0000427 return 0;
428}
Simon Glassd17da652012-02-27 10:52:35 +0000429
430int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
431{
432 const u32 *phandle;
433 int lookup;
434
Simon Glass1cb23232012-07-12 05:25:01 +0000435 debug("%s: %s\n", __func__, prop_name);
Simon Glassd17da652012-02-27 10:52:35 +0000436 phandle = fdt_getprop(blob, node, prop_name, NULL);
437 if (!phandle)
438 return -FDT_ERR_NOTFOUND;
439
440 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
441 return lookup;
442}
443
444/**
445 * Look up a property in a node and check that it has a minimum length.
446 *
447 * @param blob FDT blob
448 * @param node node to examine
449 * @param prop_name name of property to find
450 * @param min_len minimum property length in bytes
451 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
452 found, or -FDT_ERR_BADLAYOUT if not enough data
453 * @return pointer to cell, which is only valid if err == 0
454 */
455static const void *get_prop_check_min_len(const void *blob, int node,
456 const char *prop_name, int min_len, int *err)
457{
458 const void *cell;
459 int len;
460
461 debug("%s: %s\n", __func__, prop_name);
462 cell = fdt_getprop(blob, node, prop_name, &len);
463 if (!cell)
464 *err = -FDT_ERR_NOTFOUND;
465 else if (len < min_len)
466 *err = -FDT_ERR_BADLAYOUT;
467 else
468 *err = 0;
469 return cell;
470}
471
472int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
473 u32 *array, int count)
474{
475 const u32 *cell;
476 int i, err = 0;
477
478 debug("%s: %s\n", __func__, prop_name);
479 cell = get_prop_check_min_len(blob, node, prop_name,
480 sizeof(u32) * count, &err);
481 if (!err) {
482 for (i = 0; i < count; i++)
483 array[i] = fdt32_to_cpu(cell[i]);
484 }
485 return err;
486}
487
Simon Glass96875e72012-04-02 13:18:41 +0000488const u32 *fdtdec_locate_array(const void *blob, int node,
489 const char *prop_name, int count)
490{
491 const u32 *cell;
492 int err;
493
494 cell = get_prop_check_min_len(blob, node, prop_name,
495 sizeof(u32) * count, &err);
496 return err ? NULL : cell;
497}
498
Simon Glassd17da652012-02-27 10:52:35 +0000499int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
500{
501 const s32 *cell;
502 int len;
503
504 debug("%s: %s\n", __func__, prop_name);
505 cell = fdt_getprop(blob, node, prop_name, &len);
506 return cell != NULL;
507}
Simon Glassed3ee5c2012-02-27 10:52:36 +0000508
509/**
510 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
511 * terminating item.
512 *
513 * @param blob FDT blob to use
514 * @param node Node to look at
515 * @param prop_name Node property name
516 * @param gpio Array of gpio elements to fill from FDT. This will be
517 * untouched if either 0 or an error is returned
518 * @param max_count Maximum number of elements allowed
519 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
520 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
521 */
Abhilash Kesavan5921f6a2012-10-25 16:31:01 +0000522int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
523 struct fdt_gpio_state *gpio, int max_count)
Simon Glassed3ee5c2012-02-27 10:52:36 +0000524{
525 const struct fdt_property *prop;
526 const u32 *cell;
527 const char *name;
528 int len, i;
529
530 debug("%s: %s\n", __func__, prop_name);
531 assert(max_count > 0);
532 prop = fdt_get_property(blob, node, prop_name, &len);
533 if (!prop) {
Simon Glass1cb23232012-07-12 05:25:01 +0000534 debug("%s: property '%s' missing\n", __func__, prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000535 return -FDT_ERR_NOTFOUND;
536 }
537
538 /* We will use the name to tag the GPIO */
539 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
540 cell = (u32 *)prop->data;
541 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
542 if (len > max_count) {
Simon Glass1cb23232012-07-12 05:25:01 +0000543 debug(" %s: too many GPIOs / cells for "
Simon Glassed3ee5c2012-02-27 10:52:36 +0000544 "property '%s'\n", __func__, prop_name);
545 return -FDT_ERR_BADLAYOUT;
546 }
547
548 /* Read out the GPIO data from the cells */
549 for (i = 0; i < len; i++, cell += 3) {
550 gpio[i].gpio = fdt32_to_cpu(cell[1]);
551 gpio[i].flags = fdt32_to_cpu(cell[2]);
552 gpio[i].name = name;
553 }
554
555 return len;
556}
557
558int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
559 struct fdt_gpio_state *gpio)
560{
561 int err;
562
563 debug("%s: %s\n", __func__, prop_name);
564 gpio->gpio = FDT_GPIO_NONE;
565 gpio->name = NULL;
566 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
567 return err == 1 ? 0 : err;
568}
569
Sean Paul202ff752012-10-25 16:31:06 +0000570int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
571{
572 int val;
573
574 if (!fdt_gpio_isvalid(gpio))
575 return -1;
576
577 val = gpio_get_value(gpio->gpio);
578 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
579}
580
581int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
582{
583 if (!fdt_gpio_isvalid(gpio))
584 return -1;
585
586 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
587 return gpio_set_value(gpio->gpio, val);
588}
589
Simon Glassed3ee5c2012-02-27 10:52:36 +0000590int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
591{
592 /*
593 * Return success if there is no GPIO defined. This is used for
594 * optional GPIOs)
595 */
596 if (!fdt_gpio_isvalid(gpio))
597 return 0;
598
599 if (gpio_request(gpio->gpio, gpio->name))
600 return -1;
601 return 0;
602}
Anton Staffbed4d892012-04-17 09:01:28 +0000603
604int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
605 u8 *array, int count)
606{
607 const u8 *cell;
608 int err;
609
610 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
611 if (!err)
612 memcpy(array, cell, count);
613 return err;
614}
615
616const u8 *fdtdec_locate_byte_array(const void *blob, int node,
617 const char *prop_name, int count)
618{
619 const u8 *cell;
620 int err;
621
622 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
623 if (err)
624 return NULL;
625 return cell;
626}
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000627
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000628int fdtdec_get_config_int(const void *blob, const char *prop_name,
629 int default_val)
630{
631 int config_node;
632
633 debug("%s: %s\n", __func__, prop_name);
634 config_node = fdt_path_offset(blob, "/config");
635 if (config_node < 0)
636 return default_val;
637 return fdtdec_get_int(blob, config_node, prop_name, default_val);
638}
Simon Glass332ab0d2012-10-25 16:30:59 +0000639
Gabe Black79289c02012-10-25 16:31:04 +0000640int fdtdec_get_config_bool(const void *blob, const char *prop_name)
641{
642 int config_node;
643 const void *prop;
644
645 debug("%s: %s\n", __func__, prop_name);
646 config_node = fdt_path_offset(blob, "/config");
647 if (config_node < 0)
648 return 0;
649 prop = fdt_get_property(blob, config_node, prop_name, NULL);
650
651 return prop != NULL;
652}
653
Simon Glass332ab0d2012-10-25 16:30:59 +0000654char *fdtdec_get_config_string(const void *blob, const char *prop_name)
655{
656 const char *nodep;
657 int nodeoffset;
658 int len;
659
660 debug("%s: %s\n", __func__, prop_name);
661 nodeoffset = fdt_path_offset(blob, "/config");
662 if (nodeoffset < 0)
663 return NULL;
664
665 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
666 if (!nodep)
667 return NULL;
668
669 return (char *)nodep;
670}
Simon Glassf20c4612012-10-25 16:31:00 +0000671
672int fdtdec_decode_region(const void *blob, int node,
673 const char *prop_name, void **ptrp, size_t *size)
674{
675 const fdt_addr_t *cell;
676 int len;
677
678 debug("%s: %s\n", __func__, prop_name);
679 cell = fdt_getprop(blob, node, prop_name, &len);
680 if (!cell || (len != sizeof(fdt_addr_t) * 2))
681 return -1;
682
Simon Glass370b6c52013-11-10 10:26:54 -0700683 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
Simon Glassf20c4612012-10-25 16:31:00 +0000684 *size = fdt_size_to_cpu(cell[1]);
685 debug("%s: size=%zx\n", __func__, *size);
686 return 0;
687}
Simon Glass006e73b2014-02-27 13:26:01 -0700688
689/**
690 * Read a flash entry from the fdt
691 *
692 * @param blob FDT blob
693 * @param node Offset of node to read
694 * @param name Name of node being read
695 * @param entry Place to put offset and size of this node
696 * @return 0 if ok, -ve on error
697 */
698int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
699 struct fmap_entry *entry)
700{
701 u32 reg[2];
702
703 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
704 debug("Node '%s' has bad/missing 'reg' property\n", name);
705 return -FDT_ERR_NOTFOUND;
706 }
707 entry->offset = reg[0];
708 entry->length = reg[1];
709
710 return 0;
711}
Thierry Reding56f42242014-08-26 17:33:53 +0200712
713static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
714{
715 u64 number = 0;
716
717 while (cells--)
718 number = (number << 32) | fdt32_to_cpu(*ptr++);
719
720 return number;
721}
722
723int fdt_get_resource(const void *fdt, int node, const char *property,
724 unsigned int index, struct fdt_resource *res)
725{
726 const fdt32_t *ptr, *end;
727 int na, ns, len, parent;
728 unsigned int i = 0;
729
730 parent = fdt_parent_offset(fdt, node);
731 if (parent < 0)
732 return parent;
733
734 na = fdt_address_cells(fdt, parent);
735 ns = fdt_size_cells(fdt, parent);
736
737 ptr = fdt_getprop(fdt, node, property, &len);
738 if (!ptr)
739 return len;
740
741 end = ptr + len / sizeof(*ptr);
742
743 while (ptr + na + ns <= end) {
744 if (i == index) {
745 res->start = res->end = fdtdec_get_number(ptr, na);
746 res->end += fdtdec_get_number(&ptr[na], ns) - 1;
747 return 0;
748 }
749
750 ptr += na + ns;
751 i++;
752 }
753
754 return -FDT_ERR_NOTFOUND;
755}
756
757int fdt_get_named_resource(const void *fdt, int node, const char *property,
758 const char *prop_names, const char *name,
759 struct fdt_resource *res)
760{
761 int index;
762
763 index = fdt_find_string(fdt, node, prop_names, name);
764 if (index < 0)
765 return index;
766
767 return fdt_get_resource(fdt, node, property, index, res);
768}
Thierry Reding9f85eee2014-08-26 17:33:54 +0200769
770int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf)
771{
772 const fdt32_t *prop;
773 int len;
774
775 prop = fdt_getprop(fdt, node, "reg", &len);
776 if (!prop)
777 return len;
778
779 *bdf = fdt32_to_cpu(*prop) & 0xffffff;
780
781 return 0;
782}
Heiko Schocher29a23f92014-03-03 12:19:30 +0100783#endif