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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 Glassb5220bc2011-10-24 19:15:32 +000075};
76
Simon Glassa53f4a22012-01-17 08:20:50 +000077const char *fdtdec_get_compatible(enum fdt_compat_id id)
78{
79 /* We allow reading of the 'unknown' ID for testing purposes */
80 assert(id >= 0 && id < COMPAT_COUNT);
81 return compat_names[id];
82}
83
Simon Glass4397a2a2013-03-19 04:58:51 +000084fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
85 const char *prop_name, fdt_size_t *sizep)
Simon Glassb5220bc2011-10-24 19:15:32 +000086{
87 const fdt_addr_t *cell;
88 int len;
89
Simon Glass1cb23232012-07-12 05:25:01 +000090 debug("%s: %s: ", __func__, prop_name);
Simon Glassb5220bc2011-10-24 19:15:32 +000091 cell = fdt_getprop(blob, node, prop_name, &len);
Simon Glass4397a2a2013-03-19 04:58:51 +000092 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
93 len == sizeof(fdt_addr_t) * 2)) {
Simon Glass1cb23232012-07-12 05:25:01 +000094 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
Simon Glass4397a2a2013-03-19 04:58:51 +000095 if (sizep) {
96 const fdt_size_t *size;
Simon Glass1cb23232012-07-12 05:25:01 +000097
Simon Glass4397a2a2013-03-19 04:58:51 +000098 size = (fdt_size_t *)((char *)cell +
99 sizeof(fdt_addr_t));
100 *sizep = fdt_size_to_cpu(*size);
Simon Glass370b6c52013-11-10 10:26:54 -0700101 debug("addr=%08lx, size=%08x\n",
102 (ulong)addr, *sizep);
Simon Glass4397a2a2013-03-19 04:58:51 +0000103 } else {
Simon Glass370b6c52013-11-10 10:26:54 -0700104 debug("%08lx\n", (ulong)addr);
Simon Glass4397a2a2013-03-19 04:58:51 +0000105 }
Simon Glass1cb23232012-07-12 05:25:01 +0000106 return addr;
107 }
108 debug("(not found)\n");
Simon Glassb5220bc2011-10-24 19:15:32 +0000109 return FDT_ADDR_T_NONE;
110}
111
Simon Glass4397a2a2013-03-19 04:58:51 +0000112fdt_addr_t fdtdec_get_addr(const void *blob, int node,
113 const char *prop_name)
114{
115 return fdtdec_get_addr_size(blob, node, prop_name, NULL);
116}
117
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000118uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
119 uint64_t default_val)
120{
121 const uint64_t *cell64;
122 int length;
123
124 cell64 = fdt_getprop(blob, node, prop_name, &length);
125 if (!cell64 || length < sizeof(*cell64))
126 return default_val;
127
128 return fdt64_to_cpu(*cell64);
129}
130
Simon Glassf88fe2d2012-02-27 10:52:34 +0000131int fdtdec_get_is_enabled(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000132{
133 const char *cell;
134
Simon Glassf88fe2d2012-02-27 10:52:34 +0000135 /*
136 * It should say "okay", so only allow that. Some fdts use "ok" but
137 * this is a bug. Please fix your device tree source file. See here
138 * for discussion:
139 *
140 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
141 */
Simon Glassb5220bc2011-10-24 19:15:32 +0000142 cell = fdt_getprop(blob, node, "status", NULL);
143 if (cell)
Simon Glassf88fe2d2012-02-27 10:52:34 +0000144 return 0 == strcmp(cell, "okay");
145 return 1;
Simon Glassb5220bc2011-10-24 19:15:32 +0000146}
147
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500148enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
Simon Glassb5220bc2011-10-24 19:15:32 +0000149{
150 enum fdt_compat_id id;
151
152 /* Search our drivers */
153 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
154 if (0 == fdt_node_check_compatible(blob, node,
155 compat_names[id]))
156 return id;
157 return COMPAT_UNKNOWN;
158}
159
160int fdtdec_next_compatible(const void *blob, int node,
161 enum fdt_compat_id id)
162{
163 return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
164}
165
Simon Glass3ddecfc2012-04-02 13:18:42 +0000166int fdtdec_next_compatible_subnode(const void *blob, int node,
167 enum fdt_compat_id id, int *depthp)
168{
169 do {
170 node = fdt_next_node(blob, node, depthp);
171 } while (*depthp > 1);
172
173 /* If this is a direct subnode, and compatible, return it */
174 if (*depthp == 1 && 0 == fdt_node_check_compatible(
175 blob, node, compat_names[id]))
176 return node;
177
178 return -FDT_ERR_NOTFOUND;
179}
180
Simon Glassb5220bc2011-10-24 19:15:32 +0000181int fdtdec_next_alias(const void *blob, const char *name,
182 enum fdt_compat_id id, int *upto)
183{
184#define MAX_STR_LEN 20
185 char str[MAX_STR_LEN + 20];
186 int node, err;
187
188 /* snprintf() is not available */
189 assert(strlen(name) < MAX_STR_LEN);
190 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
Simon Glass00878472012-10-31 14:02:42 +0000191 node = fdt_path_offset(blob, str);
Simon Glassb5220bc2011-10-24 19:15:32 +0000192 if (node < 0)
193 return node;
194 err = fdt_node_check_compatible(blob, node, compat_names[id]);
195 if (err < 0)
196 return err;
Simon Glassf88fe2d2012-02-27 10:52:34 +0000197 if (err)
198 return -FDT_ERR_NOTFOUND;
199 (*upto)++;
200 return node;
Simon Glassb5220bc2011-10-24 19:15:32 +0000201}
202
Simon Glassa53f4a22012-01-17 08:20:50 +0000203int fdtdec_find_aliases_for_id(const void *blob, const char *name,
204 enum fdt_compat_id id, int *node_list, int maxcount)
205{
Simon Glassc6782272012-02-03 15:13:53 +0000206 memset(node_list, '\0', sizeof(*node_list) * maxcount);
207
208 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
209}
210
211/* TODO: Can we tighten this code up a little? */
212int fdtdec_add_aliases_for_id(const void *blob, const char *name,
213 enum fdt_compat_id id, int *node_list, int maxcount)
214{
Simon Glassa53f4a22012-01-17 08:20:50 +0000215 int name_len = strlen(name);
216 int nodes[maxcount];
217 int num_found = 0;
218 int offset, node;
219 int alias_node;
220 int count;
221 int i, j;
222
223 /* find the alias node if present */
224 alias_node = fdt_path_offset(blob, "/aliases");
225
226 /*
227 * start with nothing, and we can assume that the root node can't
228 * match
229 */
230 memset(nodes, '\0', sizeof(nodes));
231
232 /* First find all the compatible nodes */
233 for (node = count = 0; node >= 0 && count < maxcount;) {
234 node = fdtdec_next_compatible(blob, node, id);
235 if (node >= 0)
236 nodes[count++] = node;
237 }
238 if (node >= 0)
239 debug("%s: warning: maxcount exceeded with alias '%s'\n",
240 __func__, name);
241
242 /* Now find all the aliases */
Simon Glassa53f4a22012-01-17 08:20:50 +0000243 for (offset = fdt_first_property_offset(blob, alias_node);
244 offset > 0;
245 offset = fdt_next_property_offset(blob, offset)) {
246 const struct fdt_property *prop;
247 const char *path;
248 int number;
249 int found;
250
251 node = 0;
252 prop = fdt_get_property_by_offset(blob, offset, NULL);
253 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
254 if (prop->len && 0 == strncmp(path, name, name_len))
255 node = fdt_path_offset(blob, prop->data);
256 if (node <= 0)
257 continue;
258
259 /* Get the alias number */
260 number = simple_strtoul(path + name_len, NULL, 10);
261 if (number < 0 || number >= maxcount) {
262 debug("%s: warning: alias '%s' is out of range\n",
263 __func__, path);
264 continue;
265 }
266
267 /* Make sure the node we found is actually in our list! */
268 found = -1;
269 for (j = 0; j < count; j++)
270 if (nodes[j] == node) {
271 found = j;
272 break;
273 }
274
275 if (found == -1) {
276 debug("%s: warning: alias '%s' points to a node "
277 "'%s' that is missing or is not compatible "
278 " with '%s'\n", __func__, path,
279 fdt_get_name(blob, node, NULL),
280 compat_names[id]);
281 continue;
282 }
283
284 /*
285 * Add this node to our list in the right place, and mark
286 * it as done.
287 */
288 if (fdtdec_get_is_enabled(blob, node)) {
Simon Glassc6782272012-02-03 15:13:53 +0000289 if (node_list[number]) {
290 debug("%s: warning: alias '%s' requires that "
291 "a node be placed in the list in a "
292 "position which is already filled by "
293 "node '%s'\n", __func__, path,
294 fdt_get_name(blob, node, NULL));
295 continue;
296 }
Simon Glassa53f4a22012-01-17 08:20:50 +0000297 node_list[number] = node;
298 if (number >= num_found)
299 num_found = number + 1;
300 }
Simon Glassc6782272012-02-03 15:13:53 +0000301 nodes[found] = 0;
Simon Glassa53f4a22012-01-17 08:20:50 +0000302 }
303
304 /* Add any nodes not mentioned by an alias */
305 for (i = j = 0; i < maxcount; i++) {
306 if (!node_list[i]) {
307 for (; j < maxcount; j++)
308 if (nodes[j] &&
309 fdtdec_get_is_enabled(blob, nodes[j]))
310 break;
311
312 /* Have we run out of nodes to add? */
313 if (j == maxcount)
314 break;
315
316 assert(!node_list[i]);
317 node_list[i] = nodes[j++];
318 if (i >= num_found)
319 num_found = i + 1;
320 }
321 }
322
323 return num_found;
324}
325
Simon Glass5c33c9f2014-07-23 06:55:09 -0600326int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
327 int *seqp)
328{
329 int base_len = strlen(base);
330 const char *find_name;
331 int find_namelen;
332 int prop_offset;
333 int aliases;
334
335 find_name = fdt_get_name(blob, offset, &find_namelen);
336 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
337
338 aliases = fdt_path_offset(blob, "/aliases");
339 for (prop_offset = fdt_first_property_offset(blob, aliases);
340 prop_offset > 0;
341 prop_offset = fdt_next_property_offset(blob, prop_offset)) {
342 const char *prop;
343 const char *name;
344 const char *slash;
345 const char *p;
346 int len;
347
348 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
349 debug(" - %s, %s\n", name, prop);
350 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
351 strncmp(name, base, base_len))
352 continue;
353
354 slash = strrchr(prop, '/');
355 if (strcmp(slash + 1, find_name))
356 continue;
357 for (p = name; *p; p++) {
358 if (isdigit(*p)) {
359 *seqp = simple_strtoul(p, NULL, 10);
360 debug("Found seq %d\n", *seqp);
361 return 0;
362 }
363 }
364 }
365
366 debug("Not found\n");
367 return -ENOENT;
368}
369
Simon Glass3234aa42014-07-23 06:55:16 -0600370int fdtdec_get_alias_node(const void *blob, const char *name)
371{
372 const char *prop;
373 int alias_node;
374 int len;
375
376 if (!blob)
377 return -FDT_ERR_NOTFOUND;
378 alias_node = fdt_path_offset(blob, "/aliases");
379 prop = fdt_getprop(blob, alias_node, name, &len);
380 if (!prop)
381 return -FDT_ERR_NOTFOUND;
382 return fdt_path_offset(blob, prop);
383}
384
Simon Glassaac07d42014-09-04 16:27:24 -0600385int fdtdec_get_chosen_node(const void *blob, const char *name)
386{
387 const char *prop;
388 int chosen_node;
389 int len;
390
391 if (!blob)
392 return -FDT_ERR_NOTFOUND;
393 chosen_node = fdt_path_offset(blob, "/chosen");
394 prop = fdt_getprop(blob, chosen_node, name, &len);
395 if (!prop)
396 return -FDT_ERR_NOTFOUND;
397 return fdt_path_offset(blob, prop);
398}
399
Simon Glass9a263e52012-03-28 10:08:24 +0000400int fdtdec_check_fdt(void)
401{
402 /*
403 * We must have an FDT, but we cannot panic() yet since the console
404 * is not ready. So for now, just assert(). Boards which need an early
405 * FDT (prior to console ready) will need to make their own
406 * arrangements and do their own checks.
407 */
408 assert(!fdtdec_prepare_fdt());
409 return 0;
410}
411
Simon Glassb5220bc2011-10-24 19:15:32 +0000412/*
413 * This function is a little odd in that it accesses global data. At some
414 * point if the architecture board.c files merge this will make more sense.
415 * Even now, it is common code.
416 */
Simon Glass9a263e52012-03-28 10:08:24 +0000417int fdtdec_prepare_fdt(void)
Simon Glassb5220bc2011-10-24 19:15:32 +0000418{
Simon Glassc309c2d2013-04-20 08:42:46 +0000419 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
420 fdt_check_header(gd->fdt_blob)) {
Simon Glass9a263e52012-03-28 10:08:24 +0000421 printf("No valid FDT found - please append one to U-Boot "
422 "binary, use u-boot-dtb.bin or define "
Simon Glassa733b062013-04-26 02:53:43 +0000423 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
Simon Glass9a263e52012-03-28 10:08:24 +0000424 return -1;
425 }
Simon Glassb5220bc2011-10-24 19:15:32 +0000426 return 0;
427}
Simon Glassd17da652012-02-27 10:52:35 +0000428
429int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
430{
431 const u32 *phandle;
432 int lookup;
433
Simon Glass1cb23232012-07-12 05:25:01 +0000434 debug("%s: %s\n", __func__, prop_name);
Simon Glassd17da652012-02-27 10:52:35 +0000435 phandle = fdt_getprop(blob, node, prop_name, NULL);
436 if (!phandle)
437 return -FDT_ERR_NOTFOUND;
438
439 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
440 return lookup;
441}
442
443/**
444 * Look up a property in a node and check that it has a minimum length.
445 *
446 * @param blob FDT blob
447 * @param node node to examine
448 * @param prop_name name of property to find
449 * @param min_len minimum property length in bytes
450 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
451 found, or -FDT_ERR_BADLAYOUT if not enough data
452 * @return pointer to cell, which is only valid if err == 0
453 */
454static const void *get_prop_check_min_len(const void *blob, int node,
455 const char *prop_name, int min_len, int *err)
456{
457 const void *cell;
458 int len;
459
460 debug("%s: %s\n", __func__, prop_name);
461 cell = fdt_getprop(blob, node, prop_name, &len);
462 if (!cell)
463 *err = -FDT_ERR_NOTFOUND;
464 else if (len < min_len)
465 *err = -FDT_ERR_BADLAYOUT;
466 else
467 *err = 0;
468 return cell;
469}
470
471int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
472 u32 *array, int count)
473{
474 const u32 *cell;
475 int i, err = 0;
476
477 debug("%s: %s\n", __func__, prop_name);
478 cell = get_prop_check_min_len(blob, node, prop_name,
479 sizeof(u32) * count, &err);
480 if (!err) {
481 for (i = 0; i < count; i++)
482 array[i] = fdt32_to_cpu(cell[i]);
483 }
484 return err;
485}
486
Simon Glass96875e72012-04-02 13:18:41 +0000487const u32 *fdtdec_locate_array(const void *blob, int node,
488 const char *prop_name, int count)
489{
490 const u32 *cell;
491 int err;
492
493 cell = get_prop_check_min_len(blob, node, prop_name,
494 sizeof(u32) * count, &err);
495 return err ? NULL : cell;
496}
497
Simon Glassd17da652012-02-27 10:52:35 +0000498int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
499{
500 const s32 *cell;
501 int len;
502
503 debug("%s: %s\n", __func__, prop_name);
504 cell = fdt_getprop(blob, node, prop_name, &len);
505 return cell != NULL;
506}
Simon Glassed3ee5c2012-02-27 10:52:36 +0000507
508/**
509 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
510 * terminating item.
511 *
512 * @param blob FDT blob to use
513 * @param node Node to look at
514 * @param prop_name Node property name
515 * @param gpio Array of gpio elements to fill from FDT. This will be
516 * untouched if either 0 or an error is returned
517 * @param max_count Maximum number of elements allowed
518 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
519 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
520 */
Abhilash Kesavan5921f6a2012-10-25 16:31:01 +0000521int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
522 struct fdt_gpio_state *gpio, int max_count)
Simon Glassed3ee5c2012-02-27 10:52:36 +0000523{
524 const struct fdt_property *prop;
525 const u32 *cell;
526 const char *name;
527 int len, i;
528
529 debug("%s: %s\n", __func__, prop_name);
530 assert(max_count > 0);
531 prop = fdt_get_property(blob, node, prop_name, &len);
532 if (!prop) {
Simon Glass1cb23232012-07-12 05:25:01 +0000533 debug("%s: property '%s' missing\n", __func__, prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000534 return -FDT_ERR_NOTFOUND;
535 }
536
537 /* We will use the name to tag the GPIO */
538 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
539 cell = (u32 *)prop->data;
540 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
541 if (len > max_count) {
Simon Glass1cb23232012-07-12 05:25:01 +0000542 debug(" %s: too many GPIOs / cells for "
Simon Glassed3ee5c2012-02-27 10:52:36 +0000543 "property '%s'\n", __func__, prop_name);
544 return -FDT_ERR_BADLAYOUT;
545 }
546
547 /* Read out the GPIO data from the cells */
548 for (i = 0; i < len; i++, cell += 3) {
549 gpio[i].gpio = fdt32_to_cpu(cell[1]);
550 gpio[i].flags = fdt32_to_cpu(cell[2]);
551 gpio[i].name = name;
552 }
553
554 return len;
555}
556
557int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
558 struct fdt_gpio_state *gpio)
559{
560 int err;
561
562 debug("%s: %s\n", __func__, prop_name);
563 gpio->gpio = FDT_GPIO_NONE;
564 gpio->name = NULL;
565 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
566 return err == 1 ? 0 : err;
567}
568
Sean Paul202ff752012-10-25 16:31:06 +0000569int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
570{
571 int val;
572
573 if (!fdt_gpio_isvalid(gpio))
574 return -1;
575
576 val = gpio_get_value(gpio->gpio);
577 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
578}
579
580int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
581{
582 if (!fdt_gpio_isvalid(gpio))
583 return -1;
584
585 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
586 return gpio_set_value(gpio->gpio, val);
587}
588
Simon Glassed3ee5c2012-02-27 10:52:36 +0000589int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
590{
591 /*
592 * Return success if there is no GPIO defined. This is used for
593 * optional GPIOs)
594 */
595 if (!fdt_gpio_isvalid(gpio))
596 return 0;
597
598 if (gpio_request(gpio->gpio, gpio->name))
599 return -1;
600 return 0;
601}
Anton Staffbed4d892012-04-17 09:01:28 +0000602
603int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
604 u8 *array, int count)
605{
606 const u8 *cell;
607 int err;
608
609 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
610 if (!err)
611 memcpy(array, cell, count);
612 return err;
613}
614
615const u8 *fdtdec_locate_byte_array(const void *blob, int node,
616 const char *prop_name, int count)
617{
618 const u8 *cell;
619 int err;
620
621 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
622 if (err)
623 return NULL;
624 return cell;
625}
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000626
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000627int fdtdec_get_config_int(const void *blob, const char *prop_name,
628 int default_val)
629{
630 int config_node;
631
632 debug("%s: %s\n", __func__, prop_name);
633 config_node = fdt_path_offset(blob, "/config");
634 if (config_node < 0)
635 return default_val;
636 return fdtdec_get_int(blob, config_node, prop_name, default_val);
637}
Simon Glass332ab0d2012-10-25 16:30:59 +0000638
Gabe Black79289c02012-10-25 16:31:04 +0000639int fdtdec_get_config_bool(const void *blob, const char *prop_name)
640{
641 int config_node;
642 const void *prop;
643
644 debug("%s: %s\n", __func__, prop_name);
645 config_node = fdt_path_offset(blob, "/config");
646 if (config_node < 0)
647 return 0;
648 prop = fdt_get_property(blob, config_node, prop_name, NULL);
649
650 return prop != NULL;
651}
652
Simon Glass332ab0d2012-10-25 16:30:59 +0000653char *fdtdec_get_config_string(const void *blob, const char *prop_name)
654{
655 const char *nodep;
656 int nodeoffset;
657 int len;
658
659 debug("%s: %s\n", __func__, prop_name);
660 nodeoffset = fdt_path_offset(blob, "/config");
661 if (nodeoffset < 0)
662 return NULL;
663
664 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
665 if (!nodep)
666 return NULL;
667
668 return (char *)nodep;
669}
Simon Glassf20c4612012-10-25 16:31:00 +0000670
671int fdtdec_decode_region(const void *blob, int node,
672 const char *prop_name, void **ptrp, size_t *size)
673{
674 const fdt_addr_t *cell;
675 int len;
676
677 debug("%s: %s\n", __func__, prop_name);
678 cell = fdt_getprop(blob, node, prop_name, &len);
679 if (!cell || (len != sizeof(fdt_addr_t) * 2))
680 return -1;
681
Simon Glass370b6c52013-11-10 10:26:54 -0700682 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
Simon Glassf20c4612012-10-25 16:31:00 +0000683 *size = fdt_size_to_cpu(cell[1]);
684 debug("%s: size=%zx\n", __func__, *size);
685 return 0;
686}
Simon Glass006e73b2014-02-27 13:26:01 -0700687
688/**
689 * Read a flash entry from the fdt
690 *
691 * @param blob FDT blob
692 * @param node Offset of node to read
693 * @param name Name of node being read
694 * @param entry Place to put offset and size of this node
695 * @return 0 if ok, -ve on error
696 */
697int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
698 struct fmap_entry *entry)
699{
700 u32 reg[2];
701
702 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
703 debug("Node '%s' has bad/missing 'reg' property\n", name);
704 return -FDT_ERR_NOTFOUND;
705 }
706 entry->offset = reg[0];
707 entry->length = reg[1];
708
709 return 0;
710}
Heiko Schocher29a23f92014-03-03 12:19:30 +0100711#endif