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 27 #include <asm/gpio.h> 28 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] = { 38 COMPAT(UNKNOWN, "<none>"), 39 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), 40 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"), 41 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"), 42 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"), 43 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), 44 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), 45 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), 46 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), 47 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), 48 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), 49 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"), 50 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"), 51 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"), 52 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"), 53 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"), 54 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 55 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 56 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 57 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 58 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 59 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"), 60 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 61 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 62 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 63 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 64 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 65 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 66 }; 67 68 const 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 75 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 76 const char *prop_name, fdt_size_t *sizep) 77 { 78 const fdt_addr_t *cell; 79 int len; 80 81 debug("%s: %s: ", __func__, prop_name); 82 cell = fdt_getprop(blob, node, prop_name, &len); 83 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 84 len == sizeof(fdt_addr_t) * 2)) { 85 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 86 if (sizep) { 87 const fdt_size_t *size; 88 89 size = (fdt_size_t *)((char *)cell + 90 sizeof(fdt_addr_t)); 91 *sizep = fdt_size_to_cpu(*size); 92 debug("addr=%p, size=%p\n", (void *)addr, 93 (void *)*sizep); 94 } else { 95 debug("%p\n", (void *)addr); 96 } 97 return addr; 98 } 99 debug("(not found)\n"); 100 return FDT_ADDR_T_NONE; 101 } 102 103 fdt_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 } 108 109 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, 110 s32 default_val) 111 { 112 const s32 *cell; 113 int len; 114 115 debug("%s: %s: ", __func__, prop_name); 116 cell = fdt_getprop(blob, node, prop_name, &len); 117 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"); 124 return default_val; 125 } 126 127 uint64_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 } 139 140 int fdtdec_get_is_enabled(const void *blob, int node) 141 { 142 const char *cell; 143 144 /* 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 */ 151 cell = fdt_getprop(blob, node, "status", NULL); 152 if (cell) 153 return 0 == strcmp(cell, "okay"); 154 return 1; 155 } 156 157 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 158 { 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 } 168 169 int 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 } 174 175 int 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 } 189 190 int 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); 200 node = fdt_path_offset(blob, str); 201 if (node < 0) 202 return node; 203 err = fdt_node_check_compatible(blob, node, compat_names[id]); 204 if (err < 0) 205 return err; 206 if (err) 207 return -FDT_ERR_NOTFOUND; 208 (*upto)++; 209 return node; 210 } 211 212 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 213 enum fdt_compat_id id, int *node_list, int maxcount) 214 { 215 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? */ 221 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 222 enum fdt_compat_id id, int *node_list, int maxcount) 223 { 224 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 */ 252 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)) { 298 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 } 306 node_list[number] = node; 307 if (number >= num_found) 308 num_found = number + 1; 309 } 310 nodes[found] = 0; 311 } 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 } 334 335 int 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 } 346 347 /* 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 */ 352 int fdtdec_prepare_fdt(void) 353 { 354 if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) { 355 printf("No valid FDT found - please append one to U-Boot " 356 "binary, use u-boot-dtb.bin or define " 357 "CONFIG_OF_EMBED\n"); 358 return -1; 359 } 360 return 0; 361 } 362 363 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 364 { 365 const u32 *phandle; 366 int lookup; 367 368 debug("%s: %s\n", __func__, prop_name); 369 phandle = fdt_getprop(blob, node, prop_name, NULL); 370 if (!phandle) 371 return -FDT_ERR_NOTFOUND; 372 373 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 374 return lookup; 375 } 376 377 /** 378 * Look up a property in a node and check that it has a minimum length. 379 * 380 * @param blob FDT blob 381 * @param node node to examine 382 * @param prop_name name of property to find 383 * @param min_len minimum property length in bytes 384 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 385 found, or -FDT_ERR_BADLAYOUT if not enough data 386 * @return pointer to cell, which is only valid if err == 0 387 */ 388 static const void *get_prop_check_min_len(const void *blob, int node, 389 const char *prop_name, int min_len, int *err) 390 { 391 const void *cell; 392 int len; 393 394 debug("%s: %s\n", __func__, prop_name); 395 cell = fdt_getprop(blob, node, prop_name, &len); 396 if (!cell) 397 *err = -FDT_ERR_NOTFOUND; 398 else if (len < min_len) 399 *err = -FDT_ERR_BADLAYOUT; 400 else 401 *err = 0; 402 return cell; 403 } 404 405 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 406 u32 *array, int count) 407 { 408 const u32 *cell; 409 int i, err = 0; 410 411 debug("%s: %s\n", __func__, prop_name); 412 cell = get_prop_check_min_len(blob, node, prop_name, 413 sizeof(u32) * count, &err); 414 if (!err) { 415 for (i = 0; i < count; i++) 416 array[i] = fdt32_to_cpu(cell[i]); 417 } 418 return err; 419 } 420 421 const u32 *fdtdec_locate_array(const void *blob, int node, 422 const char *prop_name, int count) 423 { 424 const u32 *cell; 425 int err; 426 427 cell = get_prop_check_min_len(blob, node, prop_name, 428 sizeof(u32) * count, &err); 429 return err ? NULL : cell; 430 } 431 432 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 433 { 434 const s32 *cell; 435 int len; 436 437 debug("%s: %s\n", __func__, prop_name); 438 cell = fdt_getprop(blob, node, prop_name, &len); 439 return cell != NULL; 440 } 441 442 /** 443 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 444 * terminating item. 445 * 446 * @param blob FDT blob to use 447 * @param node Node to look at 448 * @param prop_name Node property name 449 * @param gpio Array of gpio elements to fill from FDT. This will be 450 * untouched if either 0 or an error is returned 451 * @param max_count Maximum number of elements allowed 452 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 453 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 454 */ 455 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 456 struct fdt_gpio_state *gpio, int max_count) 457 { 458 const struct fdt_property *prop; 459 const u32 *cell; 460 const char *name; 461 int len, i; 462 463 debug("%s: %s\n", __func__, prop_name); 464 assert(max_count > 0); 465 prop = fdt_get_property(blob, node, prop_name, &len); 466 if (!prop) { 467 debug("%s: property '%s' missing\n", __func__, prop_name); 468 return -FDT_ERR_NOTFOUND; 469 } 470 471 /* We will use the name to tag the GPIO */ 472 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 473 cell = (u32 *)prop->data; 474 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 475 if (len > max_count) { 476 debug(" %s: too many GPIOs / cells for " 477 "property '%s'\n", __func__, prop_name); 478 return -FDT_ERR_BADLAYOUT; 479 } 480 481 /* Read out the GPIO data from the cells */ 482 for (i = 0; i < len; i++, cell += 3) { 483 gpio[i].gpio = fdt32_to_cpu(cell[1]); 484 gpio[i].flags = fdt32_to_cpu(cell[2]); 485 gpio[i].name = name; 486 } 487 488 return len; 489 } 490 491 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 492 struct fdt_gpio_state *gpio) 493 { 494 int err; 495 496 debug("%s: %s\n", __func__, prop_name); 497 gpio->gpio = FDT_GPIO_NONE; 498 gpio->name = NULL; 499 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 500 return err == 1 ? 0 : err; 501 } 502 503 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 504 { 505 int val; 506 507 if (!fdt_gpio_isvalid(gpio)) 508 return -1; 509 510 val = gpio_get_value(gpio->gpio); 511 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 512 } 513 514 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 515 { 516 if (!fdt_gpio_isvalid(gpio)) 517 return -1; 518 519 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 520 return gpio_set_value(gpio->gpio, val); 521 } 522 523 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 524 { 525 /* 526 * Return success if there is no GPIO defined. This is used for 527 * optional GPIOs) 528 */ 529 if (!fdt_gpio_isvalid(gpio)) 530 return 0; 531 532 if (gpio_request(gpio->gpio, gpio->name)) 533 return -1; 534 return 0; 535 } 536 537 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 538 u8 *array, int count) 539 { 540 const u8 *cell; 541 int err; 542 543 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 544 if (!err) 545 memcpy(array, cell, count); 546 return err; 547 } 548 549 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 550 const char *prop_name, int count) 551 { 552 const u8 *cell; 553 int err; 554 555 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 556 if (err) 557 return NULL; 558 return cell; 559 } 560 561 int fdtdec_get_config_int(const void *blob, const char *prop_name, 562 int default_val) 563 { 564 int config_node; 565 566 debug("%s: %s\n", __func__, prop_name); 567 config_node = fdt_path_offset(blob, "/config"); 568 if (config_node < 0) 569 return default_val; 570 return fdtdec_get_int(blob, config_node, prop_name, default_val); 571 } 572 573 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 574 { 575 int config_node; 576 const void *prop; 577 578 debug("%s: %s\n", __func__, prop_name); 579 config_node = fdt_path_offset(blob, "/config"); 580 if (config_node < 0) 581 return 0; 582 prop = fdt_get_property(blob, config_node, prop_name, NULL); 583 584 return prop != NULL; 585 } 586 587 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 588 { 589 const char *nodep; 590 int nodeoffset; 591 int len; 592 593 debug("%s: %s\n", __func__, prop_name); 594 nodeoffset = fdt_path_offset(blob, "/config"); 595 if (nodeoffset < 0) 596 return NULL; 597 598 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 599 if (!nodep) 600 return NULL; 601 602 return (char *)nodep; 603 } 604 605 int fdtdec_decode_region(const void *blob, int node, 606 const char *prop_name, void **ptrp, size_t *size) 607 { 608 const fdt_addr_t *cell; 609 int len; 610 611 debug("%s: %s\n", __func__, prop_name); 612 cell = fdt_getprop(blob, node, prop_name, &len); 613 if (!cell || (len != sizeof(fdt_addr_t) * 2)) 614 return -1; 615 616 *ptrp = (void *)fdt_addr_to_cpu(*cell); 617 *size = fdt_size_to_cpu(cell[1]); 618 debug("%s: size=%zx\n", __func__, *size); 619 return 0; 620 } 621