1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * SPDX-License-Identifier: GPL-2.0+ 4 */ 5 6 #ifndef USE_HOSTCC 7 #include <common.h> 8 #include <errno.h> 9 #include <serial.h> 10 #include <libfdt.h> 11 #include <fdtdec.h> 12 #include <linux/ctype.h> 13 14 #include <asm/gpio.h> 15 16 DECLARE_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 24 static const char * const compat_names[COMPAT_COUNT] = { 25 COMPAT(UNKNOWN, "<none>"), 26 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), 27 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"), 28 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"), 29 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"), 30 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"), 31 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"), 32 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), 33 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), 34 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), 35 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), 36 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), 37 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), 38 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"), 39 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"), 40 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"), 41 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"), 42 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"), 43 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"), 44 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 45 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 46 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 47 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 48 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 49 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"), 50 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"), 51 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"), 52 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 53 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"), 54 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 55 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), 56 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 57 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"), 58 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), 59 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"), 60 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), 61 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"), 62 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"), 63 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 64 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 65 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 66 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), 67 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"), 68 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"), 69 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"), 70 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"), 71 COMPAT(TI_TPS65090, "ti,tps65090"), 72 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"), 73 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"), 74 COMPAT(PARADE_PS8625, "parade,ps8625"), 75 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"), 76 }; 77 78 const 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 85 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 86 const char *prop_name, fdt_size_t *sizep) 87 { 88 const fdt_addr_t *cell; 89 int len; 90 91 debug("%s: %s: ", __func__, prop_name); 92 cell = fdt_getprop(blob, node, prop_name, &len); 93 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 94 len == sizeof(fdt_addr_t) * 2)) { 95 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 96 if (sizep) { 97 const fdt_size_t *size; 98 99 size = (fdt_size_t *)((char *)cell + 100 sizeof(fdt_addr_t)); 101 *sizep = fdt_size_to_cpu(*size); 102 debug("addr=%08lx, size=%08x\n", 103 (ulong)addr, *sizep); 104 } else { 105 debug("%08lx\n", (ulong)addr); 106 } 107 return addr; 108 } 109 debug("(not found)\n"); 110 return FDT_ADDR_T_NONE; 111 } 112 113 fdt_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 } 118 119 uint64_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 } 131 132 int fdtdec_get_is_enabled(const void *blob, int node) 133 { 134 const char *cell; 135 136 /* 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 */ 143 cell = fdt_getprop(blob, node, "status", NULL); 144 if (cell) 145 return 0 == strcmp(cell, "okay"); 146 return 1; 147 } 148 149 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 150 { 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 } 160 161 int 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 } 166 167 int 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 } 181 182 int 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); 192 node = fdt_path_offset(blob, str); 193 if (node < 0) 194 return node; 195 err = fdt_node_check_compatible(blob, node, compat_names[id]); 196 if (err < 0) 197 return err; 198 if (err) 199 return -FDT_ERR_NOTFOUND; 200 (*upto)++; 201 return node; 202 } 203 204 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 205 enum fdt_compat_id id, int *node_list, int maxcount) 206 { 207 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? */ 213 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 214 enum fdt_compat_id id, int *node_list, int maxcount) 215 { 216 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 */ 244 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)) { 290 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 } 298 node_list[number] = node; 299 if (number >= num_found) 300 num_found = number + 1; 301 } 302 nodes[found] = 0; 303 } 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 } 326 327 int 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 } 370 371 int 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 } 385 386 int 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 } 400 401 int 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 } 412 413 /* 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 */ 418 int fdtdec_prepare_fdt(void) 419 { 420 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 421 fdt_check_header(gd->fdt_blob)) { 422 printf("No valid FDT found - please append one to U-Boot " 423 "binary, use u-boot-dtb.bin or define " 424 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 425 return -1; 426 } 427 return 0; 428 } 429 430 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 431 { 432 const u32 *phandle; 433 int lookup; 434 435 debug("%s: %s\n", __func__, prop_name); 436 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 */ 455 static 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 } 471 472 int 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 } 487 488 int fdtdec_get_int_array_count(const void *blob, int node, 489 const char *prop_name, u32 *array, int count) 490 { 491 const u32 *cell; 492 int len, elems; 493 int i; 494 495 debug("%s: %s\n", __func__, prop_name); 496 cell = fdt_getprop(blob, node, prop_name, &len); 497 if (!cell) 498 return -FDT_ERR_NOTFOUND; 499 elems = len / sizeof(u32); 500 if (count > elems) 501 count = elems; 502 for (i = 0; i < count; i++) 503 array[i] = fdt32_to_cpu(cell[i]); 504 505 return count; 506 } 507 508 const u32 *fdtdec_locate_array(const void *blob, int node, 509 const char *prop_name, int count) 510 { 511 const u32 *cell; 512 int err; 513 514 cell = get_prop_check_min_len(blob, node, prop_name, 515 sizeof(u32) * count, &err); 516 return err ? NULL : cell; 517 } 518 519 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 520 { 521 const s32 *cell; 522 int len; 523 524 debug("%s: %s\n", __func__, prop_name); 525 cell = fdt_getprop(blob, node, prop_name, &len); 526 return cell != NULL; 527 } 528 529 /** 530 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 531 * terminating item. 532 * 533 * @param blob FDT blob to use 534 * @param node Node to look at 535 * @param prop_name Node property name 536 * @param gpio Array of gpio elements to fill from FDT. This will be 537 * untouched if either 0 or an error is returned 538 * @param max_count Maximum number of elements allowed 539 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 540 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 541 */ 542 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 543 struct fdt_gpio_state *gpio, int max_count) 544 { 545 const struct fdt_property *prop; 546 const u32 *cell; 547 const char *name; 548 int len, i; 549 550 debug("%s: %s\n", __func__, prop_name); 551 assert(max_count > 0); 552 prop = fdt_get_property(blob, node, prop_name, &len); 553 if (!prop) { 554 debug("%s: property '%s' missing\n", __func__, prop_name); 555 return -FDT_ERR_NOTFOUND; 556 } 557 558 /* We will use the name to tag the GPIO */ 559 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 560 cell = (u32 *)prop->data; 561 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 562 if (len > max_count) { 563 debug(" %s: too many GPIOs / cells for " 564 "property '%s'\n", __func__, prop_name); 565 return -FDT_ERR_BADLAYOUT; 566 } 567 568 /* Read out the GPIO data from the cells */ 569 for (i = 0; i < len; i++, cell += 3) { 570 gpio[i].gpio = fdt32_to_cpu(cell[1]); 571 gpio[i].flags = fdt32_to_cpu(cell[2]); 572 gpio[i].name = name; 573 } 574 575 return len; 576 } 577 578 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 579 struct fdt_gpio_state *gpio) 580 { 581 int err; 582 583 debug("%s: %s\n", __func__, prop_name); 584 gpio->gpio = FDT_GPIO_NONE; 585 gpio->name = NULL; 586 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 587 return err == 1 ? 0 : err; 588 } 589 590 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 591 { 592 int val; 593 594 if (!fdt_gpio_isvalid(gpio)) 595 return -1; 596 597 val = gpio_get_value(gpio->gpio); 598 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 599 } 600 601 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 602 { 603 if (!fdt_gpio_isvalid(gpio)) 604 return -1; 605 606 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 607 return gpio_set_value(gpio->gpio, val); 608 } 609 610 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 611 { 612 /* 613 * Return success if there is no GPIO defined. This is used for 614 * optional GPIOs) 615 */ 616 if (!fdt_gpio_isvalid(gpio)) 617 return 0; 618 619 if (gpio_request(gpio->gpio, gpio->name)) 620 return -1; 621 return 0; 622 } 623 624 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 625 u8 *array, int count) 626 { 627 const u8 *cell; 628 int err; 629 630 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 631 if (!err) 632 memcpy(array, cell, count); 633 return err; 634 } 635 636 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 637 const char *prop_name, int count) 638 { 639 const u8 *cell; 640 int err; 641 642 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 643 if (err) 644 return NULL; 645 return cell; 646 } 647 648 int fdtdec_get_config_int(const void *blob, const char *prop_name, 649 int default_val) 650 { 651 int config_node; 652 653 debug("%s: %s\n", __func__, prop_name); 654 config_node = fdt_path_offset(blob, "/config"); 655 if (config_node < 0) 656 return default_val; 657 return fdtdec_get_int(blob, config_node, prop_name, default_val); 658 } 659 660 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 661 { 662 int config_node; 663 const void *prop; 664 665 debug("%s: %s\n", __func__, prop_name); 666 config_node = fdt_path_offset(blob, "/config"); 667 if (config_node < 0) 668 return 0; 669 prop = fdt_get_property(blob, config_node, prop_name, NULL); 670 671 return prop != NULL; 672 } 673 674 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 675 { 676 const char *nodep; 677 int nodeoffset; 678 int len; 679 680 debug("%s: %s\n", __func__, prop_name); 681 nodeoffset = fdt_path_offset(blob, "/config"); 682 if (nodeoffset < 0) 683 return NULL; 684 685 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 686 if (!nodep) 687 return NULL; 688 689 return (char *)nodep; 690 } 691 692 int fdtdec_decode_region(const void *blob, int node, 693 const char *prop_name, void **ptrp, size_t *size) 694 { 695 const fdt_addr_t *cell; 696 int len; 697 698 debug("%s: %s\n", __func__, prop_name); 699 cell = fdt_getprop(blob, node, prop_name, &len); 700 if (!cell || (len != sizeof(fdt_addr_t) * 2)) 701 return -1; 702 703 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size); 704 *size = fdt_size_to_cpu(cell[1]); 705 debug("%s: size=%zx\n", __func__, *size); 706 return 0; 707 } 708 709 /** 710 * Read a flash entry from the fdt 711 * 712 * @param blob FDT blob 713 * @param node Offset of node to read 714 * @param name Name of node being read 715 * @param entry Place to put offset and size of this node 716 * @return 0 if ok, -ve on error 717 */ 718 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 719 struct fmap_entry *entry) 720 { 721 u32 reg[2]; 722 723 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 724 debug("Node '%s' has bad/missing 'reg' property\n", name); 725 return -FDT_ERR_NOTFOUND; 726 } 727 entry->offset = reg[0]; 728 entry->length = reg[1]; 729 730 return 0; 731 } 732 733 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 734 { 735 u64 number = 0; 736 737 while (cells--) 738 number = (number << 32) | fdt32_to_cpu(*ptr++); 739 740 return number; 741 } 742 743 int fdt_get_resource(const void *fdt, int node, const char *property, 744 unsigned int index, struct fdt_resource *res) 745 { 746 const fdt32_t *ptr, *end; 747 int na, ns, len, parent; 748 unsigned int i = 0; 749 750 parent = fdt_parent_offset(fdt, node); 751 if (parent < 0) 752 return parent; 753 754 na = fdt_address_cells(fdt, parent); 755 ns = fdt_size_cells(fdt, parent); 756 757 ptr = fdt_getprop(fdt, node, property, &len); 758 if (!ptr) 759 return len; 760 761 end = ptr + len / sizeof(*ptr); 762 763 while (ptr + na + ns <= end) { 764 if (i == index) { 765 res->start = res->end = fdtdec_get_number(ptr, na); 766 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 767 return 0; 768 } 769 770 ptr += na + ns; 771 i++; 772 } 773 774 return -FDT_ERR_NOTFOUND; 775 } 776 777 int fdt_get_named_resource(const void *fdt, int node, const char *property, 778 const char *prop_names, const char *name, 779 struct fdt_resource *res) 780 { 781 int index; 782 783 index = fdt_find_string(fdt, node, prop_names, name); 784 if (index < 0) 785 return index; 786 787 return fdt_get_resource(fdt, node, property, index, res); 788 } 789 790 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) 791 { 792 const fdt32_t *prop; 793 int len; 794 795 prop = fdt_getprop(fdt, node, "reg", &len); 796 if (!prop) 797 return len; 798 799 *bdf = fdt32_to_cpu(*prop) & 0xffffff; 800 801 return 0; 802 } 803 #endif 804