Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2011 The Chromium OS Authors. |
| 3 | * See file CREDITS for list of people who contributed to this |
| 4 | * project. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation; either version 2 of |
| 9 | * the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 19 | * MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <common.h> |
| 23 | #include <serial.h> |
| 24 | #include <libfdt.h> |
| 25 | #include <fdtdec.h> |
| 26 | |
Michal Simek | e46431e | 2012-07-11 02:26:38 +0000 | [diff] [blame] | 27 | #include <asm/gpio.h> |
Simon Glass | ed3ee5c | 2012-02-27 10:52:36 +0000 | [diff] [blame] | 28 | |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 29 | DECLARE_GLOBAL_DATA_PTR; |
| 30 | |
| 31 | /* |
| 32 | * Here are the type we know about. One day we might allow drivers to |
| 33 | * register. For now we just put them here. The COMPAT macro allows us to |
| 34 | * turn this into a sparse list later, and keeps the ID with the name. |
| 35 | */ |
| 36 | #define COMPAT(id, name) name |
| 37 | static const char * const compat_names[COMPAT_COUNT] = { |
Simon Glass | f88fe2d | 2012-02-27 10:52:34 +0000 | [diff] [blame] | 38 | COMPAT(UNKNOWN, "<none>"), |
Simon Glass | 87f938c | 2012-02-27 10:52:49 +0000 | [diff] [blame] | 39 | COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), |
Yen Lin | 96a78ac | 2012-03-06 19:00:23 +0000 | [diff] [blame] | 40 | COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"), |
| 41 | COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"), |
Jimmy Zhang | 0e35ad0 | 2012-04-02 13:18:52 +0000 | [diff] [blame] | 42 | COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), |
| 43 | COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), |
Rakesh Iyer | 6642a68 | 2012-04-17 09:01:35 +0000 | [diff] [blame] | 44 | COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), |
Jim Lin | 312693c | 2012-07-29 20:53:29 +0000 | [diff] [blame] | 45 | COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), |
Simon Glass | e1ae0d1 | 2012-10-17 13:24:49 +0000 | [diff] [blame] | 46 | COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), |
Wei Ni | 87540de | 2012-10-17 13:24:50 +0000 | [diff] [blame] | 47 | COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), |
Hatim RV | cc9fe33 | 2012-12-11 00:52:46 +0000 | [diff] [blame] | 48 | COMPAT(SMSC_LAN9215, "smsc,lan9215"), |
| 49 | COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 50 | }; |
| 51 | |
Simon Glass | a53f4a2 | 2012-01-17 08:20:50 +0000 | [diff] [blame] | 52 | const char *fdtdec_get_compatible(enum fdt_compat_id id) |
| 53 | { |
| 54 | /* We allow reading of the 'unknown' ID for testing purposes */ |
| 55 | assert(id >= 0 && id < COMPAT_COUNT); |
| 56 | return compat_names[id]; |
| 57 | } |
| 58 | |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 59 | fdt_addr_t fdtdec_get_addr(const void *blob, int node, |
| 60 | const char *prop_name) |
| 61 | { |
| 62 | const fdt_addr_t *cell; |
| 63 | int len; |
| 64 | |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 65 | debug("%s: %s: ", __func__, prop_name); |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 66 | cell = fdt_getprop(blob, node, prop_name, &len); |
| 67 | if (cell && (len == sizeof(fdt_addr_t) || |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 68 | len == sizeof(fdt_addr_t) * 2)) { |
| 69 | fdt_addr_t addr = fdt_addr_to_cpu(*cell); |
| 70 | |
| 71 | debug("%p\n", (void *)addr); |
| 72 | return addr; |
| 73 | } |
| 74 | debug("(not found)\n"); |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 75 | return FDT_ADDR_T_NONE; |
| 76 | } |
| 77 | |
| 78 | s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, |
| 79 | s32 default_val) |
| 80 | { |
| 81 | const s32 *cell; |
| 82 | int len; |
| 83 | |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 84 | debug("%s: %s: ", __func__, prop_name); |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 85 | cell = fdt_getprop(blob, node, prop_name, &len); |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 86 | if (cell && len >= sizeof(s32)) { |
| 87 | s32 val = fdt32_to_cpu(cell[0]); |
| 88 | |
| 89 | debug("%#x (%d)\n", val, val); |
| 90 | return val; |
| 91 | } |
| 92 | debug("(not found)\n"); |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 93 | return default_val; |
| 94 | } |
| 95 | |
Che-Liang Chiou | aadef0a | 2012-10-25 16:31:05 +0000 | [diff] [blame] | 96 | uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, |
| 97 | uint64_t default_val) |
| 98 | { |
| 99 | const uint64_t *cell64; |
| 100 | int length; |
| 101 | |
| 102 | cell64 = fdt_getprop(blob, node, prop_name, &length); |
| 103 | if (!cell64 || length < sizeof(*cell64)) |
| 104 | return default_val; |
| 105 | |
| 106 | return fdt64_to_cpu(*cell64); |
| 107 | } |
| 108 | |
Simon Glass | f88fe2d | 2012-02-27 10:52:34 +0000 | [diff] [blame] | 109 | int fdtdec_get_is_enabled(const void *blob, int node) |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 110 | { |
| 111 | const char *cell; |
| 112 | |
Simon Glass | f88fe2d | 2012-02-27 10:52:34 +0000 | [diff] [blame] | 113 | /* |
| 114 | * It should say "okay", so only allow that. Some fdts use "ok" but |
| 115 | * this is a bug. Please fix your device tree source file. See here |
| 116 | * for discussion: |
| 117 | * |
| 118 | * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html |
| 119 | */ |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 120 | cell = fdt_getprop(blob, node, "status", NULL); |
| 121 | if (cell) |
Simon Glass | f88fe2d | 2012-02-27 10:52:34 +0000 | [diff] [blame] | 122 | return 0 == strcmp(cell, "okay"); |
| 123 | return 1; |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 124 | } |
| 125 | |
Gerald Van Baren | 7cde397 | 2012-11-12 23:13:54 -0500 | [diff] [blame] | 126 | enum fdt_compat_id fdtdec_lookup(const void *blob, int node) |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 127 | { |
| 128 | enum fdt_compat_id id; |
| 129 | |
| 130 | /* Search our drivers */ |
| 131 | for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) |
| 132 | if (0 == fdt_node_check_compatible(blob, node, |
| 133 | compat_names[id])) |
| 134 | return id; |
| 135 | return COMPAT_UNKNOWN; |
| 136 | } |
| 137 | |
| 138 | int fdtdec_next_compatible(const void *blob, int node, |
| 139 | enum fdt_compat_id id) |
| 140 | { |
| 141 | return fdt_node_offset_by_compatible(blob, node, compat_names[id]); |
| 142 | } |
| 143 | |
Simon Glass | 3ddecfc | 2012-04-02 13:18:42 +0000 | [diff] [blame] | 144 | int fdtdec_next_compatible_subnode(const void *blob, int node, |
| 145 | enum fdt_compat_id id, int *depthp) |
| 146 | { |
| 147 | do { |
| 148 | node = fdt_next_node(blob, node, depthp); |
| 149 | } while (*depthp > 1); |
| 150 | |
| 151 | /* If this is a direct subnode, and compatible, return it */ |
| 152 | if (*depthp == 1 && 0 == fdt_node_check_compatible( |
| 153 | blob, node, compat_names[id])) |
| 154 | return node; |
| 155 | |
| 156 | return -FDT_ERR_NOTFOUND; |
| 157 | } |
| 158 | |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 159 | int fdtdec_next_alias(const void *blob, const char *name, |
| 160 | enum fdt_compat_id id, int *upto) |
| 161 | { |
| 162 | #define MAX_STR_LEN 20 |
| 163 | char str[MAX_STR_LEN + 20]; |
| 164 | int node, err; |
| 165 | |
| 166 | /* snprintf() is not available */ |
| 167 | assert(strlen(name) < MAX_STR_LEN); |
| 168 | sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); |
Simon Glass | 0087847 | 2012-10-31 14:02:42 +0000 | [diff] [blame] | 169 | node = fdt_path_offset(blob, str); |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 170 | if (node < 0) |
| 171 | return node; |
| 172 | err = fdt_node_check_compatible(blob, node, compat_names[id]); |
| 173 | if (err < 0) |
| 174 | return err; |
Simon Glass | f88fe2d | 2012-02-27 10:52:34 +0000 | [diff] [blame] | 175 | if (err) |
| 176 | return -FDT_ERR_NOTFOUND; |
| 177 | (*upto)++; |
| 178 | return node; |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 179 | } |
| 180 | |
Simon Glass | a53f4a2 | 2012-01-17 08:20:50 +0000 | [diff] [blame] | 181 | int fdtdec_find_aliases_for_id(const void *blob, const char *name, |
| 182 | enum fdt_compat_id id, int *node_list, int maxcount) |
| 183 | { |
Simon Glass | c678227 | 2012-02-03 15:13:53 +0000 | [diff] [blame] | 184 | memset(node_list, '\0', sizeof(*node_list) * maxcount); |
| 185 | |
| 186 | return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); |
| 187 | } |
| 188 | |
| 189 | /* TODO: Can we tighten this code up a little? */ |
| 190 | int fdtdec_add_aliases_for_id(const void *blob, const char *name, |
| 191 | enum fdt_compat_id id, int *node_list, int maxcount) |
| 192 | { |
Simon Glass | a53f4a2 | 2012-01-17 08:20:50 +0000 | [diff] [blame] | 193 | int name_len = strlen(name); |
| 194 | int nodes[maxcount]; |
| 195 | int num_found = 0; |
| 196 | int offset, node; |
| 197 | int alias_node; |
| 198 | int count; |
| 199 | int i, j; |
| 200 | |
| 201 | /* find the alias node if present */ |
| 202 | alias_node = fdt_path_offset(blob, "/aliases"); |
| 203 | |
| 204 | /* |
| 205 | * start with nothing, and we can assume that the root node can't |
| 206 | * match |
| 207 | */ |
| 208 | memset(nodes, '\0', sizeof(nodes)); |
| 209 | |
| 210 | /* First find all the compatible nodes */ |
| 211 | for (node = count = 0; node >= 0 && count < maxcount;) { |
| 212 | node = fdtdec_next_compatible(blob, node, id); |
| 213 | if (node >= 0) |
| 214 | nodes[count++] = node; |
| 215 | } |
| 216 | if (node >= 0) |
| 217 | debug("%s: warning: maxcount exceeded with alias '%s'\n", |
| 218 | __func__, name); |
| 219 | |
| 220 | /* Now find all the aliases */ |
Simon Glass | a53f4a2 | 2012-01-17 08:20:50 +0000 | [diff] [blame] | 221 | for (offset = fdt_first_property_offset(blob, alias_node); |
| 222 | offset > 0; |
| 223 | offset = fdt_next_property_offset(blob, offset)) { |
| 224 | const struct fdt_property *prop; |
| 225 | const char *path; |
| 226 | int number; |
| 227 | int found; |
| 228 | |
| 229 | node = 0; |
| 230 | prop = fdt_get_property_by_offset(blob, offset, NULL); |
| 231 | path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); |
| 232 | if (prop->len && 0 == strncmp(path, name, name_len)) |
| 233 | node = fdt_path_offset(blob, prop->data); |
| 234 | if (node <= 0) |
| 235 | continue; |
| 236 | |
| 237 | /* Get the alias number */ |
| 238 | number = simple_strtoul(path + name_len, NULL, 10); |
| 239 | if (number < 0 || number >= maxcount) { |
| 240 | debug("%s: warning: alias '%s' is out of range\n", |
| 241 | __func__, path); |
| 242 | continue; |
| 243 | } |
| 244 | |
| 245 | /* Make sure the node we found is actually in our list! */ |
| 246 | found = -1; |
| 247 | for (j = 0; j < count; j++) |
| 248 | if (nodes[j] == node) { |
| 249 | found = j; |
| 250 | break; |
| 251 | } |
| 252 | |
| 253 | if (found == -1) { |
| 254 | debug("%s: warning: alias '%s' points to a node " |
| 255 | "'%s' that is missing or is not compatible " |
| 256 | " with '%s'\n", __func__, path, |
| 257 | fdt_get_name(blob, node, NULL), |
| 258 | compat_names[id]); |
| 259 | continue; |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Add this node to our list in the right place, and mark |
| 264 | * it as done. |
| 265 | */ |
| 266 | if (fdtdec_get_is_enabled(blob, node)) { |
Simon Glass | c678227 | 2012-02-03 15:13:53 +0000 | [diff] [blame] | 267 | if (node_list[number]) { |
| 268 | debug("%s: warning: alias '%s' requires that " |
| 269 | "a node be placed in the list in a " |
| 270 | "position which is already filled by " |
| 271 | "node '%s'\n", __func__, path, |
| 272 | fdt_get_name(blob, node, NULL)); |
| 273 | continue; |
| 274 | } |
Simon Glass | a53f4a2 | 2012-01-17 08:20:50 +0000 | [diff] [blame] | 275 | node_list[number] = node; |
| 276 | if (number >= num_found) |
| 277 | num_found = number + 1; |
| 278 | } |
Simon Glass | c678227 | 2012-02-03 15:13:53 +0000 | [diff] [blame] | 279 | nodes[found] = 0; |
Simon Glass | a53f4a2 | 2012-01-17 08:20:50 +0000 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | /* Add any nodes not mentioned by an alias */ |
| 283 | for (i = j = 0; i < maxcount; i++) { |
| 284 | if (!node_list[i]) { |
| 285 | for (; j < maxcount; j++) |
| 286 | if (nodes[j] && |
| 287 | fdtdec_get_is_enabled(blob, nodes[j])) |
| 288 | break; |
| 289 | |
| 290 | /* Have we run out of nodes to add? */ |
| 291 | if (j == maxcount) |
| 292 | break; |
| 293 | |
| 294 | assert(!node_list[i]); |
| 295 | node_list[i] = nodes[j++]; |
| 296 | if (i >= num_found) |
| 297 | num_found = i + 1; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | return num_found; |
| 302 | } |
| 303 | |
Simon Glass | 9a263e5 | 2012-03-28 10:08:24 +0000 | [diff] [blame] | 304 | int fdtdec_check_fdt(void) |
| 305 | { |
| 306 | /* |
| 307 | * We must have an FDT, but we cannot panic() yet since the console |
| 308 | * is not ready. So for now, just assert(). Boards which need an early |
| 309 | * FDT (prior to console ready) will need to make their own |
| 310 | * arrangements and do their own checks. |
| 311 | */ |
| 312 | assert(!fdtdec_prepare_fdt()); |
| 313 | return 0; |
| 314 | } |
| 315 | |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 316 | /* |
| 317 | * This function is a little odd in that it accesses global data. At some |
| 318 | * point if the architecture board.c files merge this will make more sense. |
| 319 | * Even now, it is common code. |
| 320 | */ |
Simon Glass | 9a263e5 | 2012-03-28 10:08:24 +0000 | [diff] [blame] | 321 | int fdtdec_prepare_fdt(void) |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 322 | { |
Simon Glass | 9a263e5 | 2012-03-28 10:08:24 +0000 | [diff] [blame] | 323 | if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) { |
| 324 | printf("No valid FDT found - please append one to U-Boot " |
| 325 | "binary, use u-boot-dtb.bin or define " |
| 326 | "CONFIG_OF_EMBED\n"); |
| 327 | return -1; |
| 328 | } |
Simon Glass | b5220bc | 2011-10-24 19:15:32 +0000 | [diff] [blame] | 329 | return 0; |
| 330 | } |
Simon Glass | d17da65 | 2012-02-27 10:52:35 +0000 | [diff] [blame] | 331 | |
| 332 | int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) |
| 333 | { |
| 334 | const u32 *phandle; |
| 335 | int lookup; |
| 336 | |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 337 | debug("%s: %s\n", __func__, prop_name); |
Simon Glass | d17da65 | 2012-02-27 10:52:35 +0000 | [diff] [blame] | 338 | phandle = fdt_getprop(blob, node, prop_name, NULL); |
| 339 | if (!phandle) |
| 340 | return -FDT_ERR_NOTFOUND; |
| 341 | |
| 342 | lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); |
| 343 | return lookup; |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * Look up a property in a node and check that it has a minimum length. |
| 348 | * |
| 349 | * @param blob FDT blob |
| 350 | * @param node node to examine |
| 351 | * @param prop_name name of property to find |
| 352 | * @param min_len minimum property length in bytes |
| 353 | * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not |
| 354 | found, or -FDT_ERR_BADLAYOUT if not enough data |
| 355 | * @return pointer to cell, which is only valid if err == 0 |
| 356 | */ |
| 357 | static const void *get_prop_check_min_len(const void *blob, int node, |
| 358 | const char *prop_name, int min_len, int *err) |
| 359 | { |
| 360 | const void *cell; |
| 361 | int len; |
| 362 | |
| 363 | debug("%s: %s\n", __func__, prop_name); |
| 364 | cell = fdt_getprop(blob, node, prop_name, &len); |
| 365 | if (!cell) |
| 366 | *err = -FDT_ERR_NOTFOUND; |
| 367 | else if (len < min_len) |
| 368 | *err = -FDT_ERR_BADLAYOUT; |
| 369 | else |
| 370 | *err = 0; |
| 371 | return cell; |
| 372 | } |
| 373 | |
| 374 | int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, |
| 375 | u32 *array, int count) |
| 376 | { |
| 377 | const u32 *cell; |
| 378 | int i, err = 0; |
| 379 | |
| 380 | debug("%s: %s\n", __func__, prop_name); |
| 381 | cell = get_prop_check_min_len(blob, node, prop_name, |
| 382 | sizeof(u32) * count, &err); |
| 383 | if (!err) { |
| 384 | for (i = 0; i < count; i++) |
| 385 | array[i] = fdt32_to_cpu(cell[i]); |
| 386 | } |
| 387 | return err; |
| 388 | } |
| 389 | |
Simon Glass | 96875e7 | 2012-04-02 13:18:41 +0000 | [diff] [blame] | 390 | const u32 *fdtdec_locate_array(const void *blob, int node, |
| 391 | const char *prop_name, int count) |
| 392 | { |
| 393 | const u32 *cell; |
| 394 | int err; |
| 395 | |
| 396 | cell = get_prop_check_min_len(blob, node, prop_name, |
| 397 | sizeof(u32) * count, &err); |
| 398 | return err ? NULL : cell; |
| 399 | } |
| 400 | |
Simon Glass | d17da65 | 2012-02-27 10:52:35 +0000 | [diff] [blame] | 401 | int fdtdec_get_bool(const void *blob, int node, const char *prop_name) |
| 402 | { |
| 403 | const s32 *cell; |
| 404 | int len; |
| 405 | |
| 406 | debug("%s: %s\n", __func__, prop_name); |
| 407 | cell = fdt_getprop(blob, node, prop_name, &len); |
| 408 | return cell != NULL; |
| 409 | } |
Simon Glass | ed3ee5c | 2012-02-27 10:52:36 +0000 | [diff] [blame] | 410 | |
| 411 | /** |
| 412 | * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no |
| 413 | * terminating item. |
| 414 | * |
| 415 | * @param blob FDT blob to use |
| 416 | * @param node Node to look at |
| 417 | * @param prop_name Node property name |
| 418 | * @param gpio Array of gpio elements to fill from FDT. This will be |
| 419 | * untouched if either 0 or an error is returned |
| 420 | * @param max_count Maximum number of elements allowed |
| 421 | * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would |
| 422 | * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. |
| 423 | */ |
Abhilash Kesavan | 5921f6a | 2012-10-25 16:31:01 +0000 | [diff] [blame] | 424 | int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, |
| 425 | struct fdt_gpio_state *gpio, int max_count) |
Simon Glass | ed3ee5c | 2012-02-27 10:52:36 +0000 | [diff] [blame] | 426 | { |
| 427 | const struct fdt_property *prop; |
| 428 | const u32 *cell; |
| 429 | const char *name; |
| 430 | int len, i; |
| 431 | |
| 432 | debug("%s: %s\n", __func__, prop_name); |
| 433 | assert(max_count > 0); |
| 434 | prop = fdt_get_property(blob, node, prop_name, &len); |
| 435 | if (!prop) { |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 436 | debug("%s: property '%s' missing\n", __func__, prop_name); |
Simon Glass | ed3ee5c | 2012-02-27 10:52:36 +0000 | [diff] [blame] | 437 | return -FDT_ERR_NOTFOUND; |
| 438 | } |
| 439 | |
| 440 | /* We will use the name to tag the GPIO */ |
| 441 | name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); |
| 442 | cell = (u32 *)prop->data; |
| 443 | len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ |
| 444 | if (len > max_count) { |
Simon Glass | 1cb2323 | 2012-07-12 05:25:01 +0000 | [diff] [blame] | 445 | debug(" %s: too many GPIOs / cells for " |
Simon Glass | ed3ee5c | 2012-02-27 10:52:36 +0000 | [diff] [blame] | 446 | "property '%s'\n", __func__, prop_name); |
| 447 | return -FDT_ERR_BADLAYOUT; |
| 448 | } |
| 449 | |
| 450 | /* Read out the GPIO data from the cells */ |
| 451 | for (i = 0; i < len; i++, cell += 3) { |
| 452 | gpio[i].gpio = fdt32_to_cpu(cell[1]); |
| 453 | gpio[i].flags = fdt32_to_cpu(cell[2]); |
| 454 | gpio[i].name = name; |
| 455 | } |
| 456 | |
| 457 | return len; |
| 458 | } |
| 459 | |
| 460 | int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, |
| 461 | struct fdt_gpio_state *gpio) |
| 462 | { |
| 463 | int err; |
| 464 | |
| 465 | debug("%s: %s\n", __func__, prop_name); |
| 466 | gpio->gpio = FDT_GPIO_NONE; |
| 467 | gpio->name = NULL; |
| 468 | err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); |
| 469 | return err == 1 ? 0 : err; |
| 470 | } |
| 471 | |
Sean Paul | 202ff75 | 2012-10-25 16:31:06 +0000 | [diff] [blame] | 472 | int fdtdec_get_gpio(struct fdt_gpio_state *gpio) |
| 473 | { |
| 474 | int val; |
| 475 | |
| 476 | if (!fdt_gpio_isvalid(gpio)) |
| 477 | return -1; |
| 478 | |
| 479 | val = gpio_get_value(gpio->gpio); |
| 480 | return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; |
| 481 | } |
| 482 | |
| 483 | int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) |
| 484 | { |
| 485 | if (!fdt_gpio_isvalid(gpio)) |
| 486 | return -1; |
| 487 | |
| 488 | val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; |
| 489 | return gpio_set_value(gpio->gpio, val); |
| 490 | } |
| 491 | |
Simon Glass | ed3ee5c | 2012-02-27 10:52:36 +0000 | [diff] [blame] | 492 | int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) |
| 493 | { |
| 494 | /* |
| 495 | * Return success if there is no GPIO defined. This is used for |
| 496 | * optional GPIOs) |
| 497 | */ |
| 498 | if (!fdt_gpio_isvalid(gpio)) |
| 499 | return 0; |
| 500 | |
| 501 | if (gpio_request(gpio->gpio, gpio->name)) |
| 502 | return -1; |
| 503 | return 0; |
| 504 | } |
Anton Staff | bed4d89 | 2012-04-17 09:01:28 +0000 | [diff] [blame] | 505 | |
| 506 | int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, |
| 507 | u8 *array, int count) |
| 508 | { |
| 509 | const u8 *cell; |
| 510 | int err; |
| 511 | |
| 512 | cell = get_prop_check_min_len(blob, node, prop_name, count, &err); |
| 513 | if (!err) |
| 514 | memcpy(array, cell, count); |
| 515 | return err; |
| 516 | } |
| 517 | |
| 518 | const u8 *fdtdec_locate_byte_array(const void *blob, int node, |
| 519 | const char *prop_name, int count) |
| 520 | { |
| 521 | const u8 *cell; |
| 522 | int err; |
| 523 | |
| 524 | cell = get_prop_check_min_len(blob, node, prop_name, count, &err); |
| 525 | if (err) |
| 526 | return NULL; |
| 527 | return cell; |
| 528 | } |
Abhilash Kesavan | 09258f1 | 2012-10-25 16:30:58 +0000 | [diff] [blame] | 529 | |
Abhilash Kesavan | 09258f1 | 2012-10-25 16:30:58 +0000 | [diff] [blame] | 530 | int fdtdec_get_config_int(const void *blob, const char *prop_name, |
| 531 | int default_val) |
| 532 | { |
| 533 | int config_node; |
| 534 | |
| 535 | debug("%s: %s\n", __func__, prop_name); |
| 536 | config_node = fdt_path_offset(blob, "/config"); |
| 537 | if (config_node < 0) |
| 538 | return default_val; |
| 539 | return fdtdec_get_int(blob, config_node, prop_name, default_val); |
| 540 | } |
Simon Glass | 332ab0d | 2012-10-25 16:30:59 +0000 | [diff] [blame] | 541 | |
Gabe Black | 79289c0 | 2012-10-25 16:31:04 +0000 | [diff] [blame] | 542 | int fdtdec_get_config_bool(const void *blob, const char *prop_name) |
| 543 | { |
| 544 | int config_node; |
| 545 | const void *prop; |
| 546 | |
| 547 | debug("%s: %s\n", __func__, prop_name); |
| 548 | config_node = fdt_path_offset(blob, "/config"); |
| 549 | if (config_node < 0) |
| 550 | return 0; |
| 551 | prop = fdt_get_property(blob, config_node, prop_name, NULL); |
| 552 | |
| 553 | return prop != NULL; |
| 554 | } |
| 555 | |
Simon Glass | 332ab0d | 2012-10-25 16:30:59 +0000 | [diff] [blame] | 556 | char *fdtdec_get_config_string(const void *blob, const char *prop_name) |
| 557 | { |
| 558 | const char *nodep; |
| 559 | int nodeoffset; |
| 560 | int len; |
| 561 | |
| 562 | debug("%s: %s\n", __func__, prop_name); |
| 563 | nodeoffset = fdt_path_offset(blob, "/config"); |
| 564 | if (nodeoffset < 0) |
| 565 | return NULL; |
| 566 | |
| 567 | nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); |
| 568 | if (!nodep) |
| 569 | return NULL; |
| 570 | |
| 571 | return (char *)nodep; |
| 572 | } |
Simon Glass | f20c461 | 2012-10-25 16:31:00 +0000 | [diff] [blame] | 573 | |
| 574 | int fdtdec_decode_region(const void *blob, int node, |
| 575 | const char *prop_name, void **ptrp, size_t *size) |
| 576 | { |
| 577 | const fdt_addr_t *cell; |
| 578 | int len; |
| 579 | |
| 580 | debug("%s: %s\n", __func__, prop_name); |
| 581 | cell = fdt_getprop(blob, node, prop_name, &len); |
| 582 | if (!cell || (len != sizeof(fdt_addr_t) * 2)) |
| 583 | return -1; |
| 584 | |
| 585 | *ptrp = (void *)fdt_addr_to_cpu(*cell); |
| 586 | *size = fdt_size_to_cpu(cell[1]); |
| 587 | debug("%s: size=%zx\n", __func__, *size); |
| 588 | return 0; |
| 589 | } |