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 COMPAT(INTEL_MICROCODE, "intel,microcode"), 77 COMPAT(MEMORY_SPD, "memory-spd"), 78 COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"), 79 COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"), 80 }; 81 82 const char *fdtdec_get_compatible(enum fdt_compat_id id) 83 { 84 /* We allow reading of the 'unknown' ID for testing purposes */ 85 assert(id >= 0 && id < COMPAT_COUNT); 86 return compat_names[id]; 87 } 88 89 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 90 const char *prop_name, fdt_size_t *sizep) 91 { 92 const fdt_addr_t *cell; 93 int len; 94 95 debug("%s: %s: ", __func__, prop_name); 96 cell = fdt_getprop(blob, node, prop_name, &len); 97 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 98 len == sizeof(fdt_addr_t) * 2)) { 99 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 100 if (sizep) { 101 const fdt_size_t *size; 102 103 size = (fdt_size_t *)((char *)cell + 104 sizeof(fdt_addr_t)); 105 *sizep = fdt_size_to_cpu(*size); 106 debug("addr=%08lx, size=%08x\n", 107 (ulong)addr, *sizep); 108 } else { 109 debug("%08lx\n", (ulong)addr); 110 } 111 return addr; 112 } 113 debug("(not found)\n"); 114 return FDT_ADDR_T_NONE; 115 } 116 117 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 118 const char *prop_name) 119 { 120 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 121 } 122 123 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 124 uint64_t default_val) 125 { 126 const uint64_t *cell64; 127 int length; 128 129 cell64 = fdt_getprop(blob, node, prop_name, &length); 130 if (!cell64 || length < sizeof(*cell64)) 131 return default_val; 132 133 return fdt64_to_cpu(*cell64); 134 } 135 136 int fdtdec_get_is_enabled(const void *blob, int node) 137 { 138 const char *cell; 139 140 /* 141 * It should say "okay", so only allow that. Some fdts use "ok" but 142 * this is a bug. Please fix your device tree source file. See here 143 * for discussion: 144 * 145 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 146 */ 147 cell = fdt_getprop(blob, node, "status", NULL); 148 if (cell) 149 return 0 == strcmp(cell, "okay"); 150 return 1; 151 } 152 153 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 154 { 155 enum fdt_compat_id id; 156 157 /* Search our drivers */ 158 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 159 if (0 == fdt_node_check_compatible(blob, node, 160 compat_names[id])) 161 return id; 162 return COMPAT_UNKNOWN; 163 } 164 165 int fdtdec_next_compatible(const void *blob, int node, 166 enum fdt_compat_id id) 167 { 168 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 169 } 170 171 int fdtdec_next_compatible_subnode(const void *blob, int node, 172 enum fdt_compat_id id, int *depthp) 173 { 174 do { 175 node = fdt_next_node(blob, node, depthp); 176 } while (*depthp > 1); 177 178 /* If this is a direct subnode, and compatible, return it */ 179 if (*depthp == 1 && 0 == fdt_node_check_compatible( 180 blob, node, compat_names[id])) 181 return node; 182 183 return -FDT_ERR_NOTFOUND; 184 } 185 186 int fdtdec_next_alias(const void *blob, const char *name, 187 enum fdt_compat_id id, int *upto) 188 { 189 #define MAX_STR_LEN 20 190 char str[MAX_STR_LEN + 20]; 191 int node, err; 192 193 /* snprintf() is not available */ 194 assert(strlen(name) < MAX_STR_LEN); 195 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 196 node = fdt_path_offset(blob, str); 197 if (node < 0) 198 return node; 199 err = fdt_node_check_compatible(blob, node, compat_names[id]); 200 if (err < 0) 201 return err; 202 if (err) 203 return -FDT_ERR_NOTFOUND; 204 (*upto)++; 205 return node; 206 } 207 208 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 209 enum fdt_compat_id id, int *node_list, int maxcount) 210 { 211 memset(node_list, '\0', sizeof(*node_list) * maxcount); 212 213 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 214 } 215 216 /* TODO: Can we tighten this code up a little? */ 217 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 218 enum fdt_compat_id id, int *node_list, int maxcount) 219 { 220 int name_len = strlen(name); 221 int nodes[maxcount]; 222 int num_found = 0; 223 int offset, node; 224 int alias_node; 225 int count; 226 int i, j; 227 228 /* find the alias node if present */ 229 alias_node = fdt_path_offset(blob, "/aliases"); 230 231 /* 232 * start with nothing, and we can assume that the root node can't 233 * match 234 */ 235 memset(nodes, '\0', sizeof(nodes)); 236 237 /* First find all the compatible nodes */ 238 for (node = count = 0; node >= 0 && count < maxcount;) { 239 node = fdtdec_next_compatible(blob, node, id); 240 if (node >= 0) 241 nodes[count++] = node; 242 } 243 if (node >= 0) 244 debug("%s: warning: maxcount exceeded with alias '%s'\n", 245 __func__, name); 246 247 /* Now find all the aliases */ 248 for (offset = fdt_first_property_offset(blob, alias_node); 249 offset > 0; 250 offset = fdt_next_property_offset(blob, offset)) { 251 const struct fdt_property *prop; 252 const char *path; 253 int number; 254 int found; 255 256 node = 0; 257 prop = fdt_get_property_by_offset(blob, offset, NULL); 258 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 259 if (prop->len && 0 == strncmp(path, name, name_len)) 260 node = fdt_path_offset(blob, prop->data); 261 if (node <= 0) 262 continue; 263 264 /* Get the alias number */ 265 number = simple_strtoul(path + name_len, NULL, 10); 266 if (number < 0 || number >= maxcount) { 267 debug("%s: warning: alias '%s' is out of range\n", 268 __func__, path); 269 continue; 270 } 271 272 /* Make sure the node we found is actually in our list! */ 273 found = -1; 274 for (j = 0; j < count; j++) 275 if (nodes[j] == node) { 276 found = j; 277 break; 278 } 279 280 if (found == -1) { 281 debug("%s: warning: alias '%s' points to a node " 282 "'%s' that is missing or is not compatible " 283 " with '%s'\n", __func__, path, 284 fdt_get_name(blob, node, NULL), 285 compat_names[id]); 286 continue; 287 } 288 289 /* 290 * Add this node to our list in the right place, and mark 291 * it as done. 292 */ 293 if (fdtdec_get_is_enabled(blob, node)) { 294 if (node_list[number]) { 295 debug("%s: warning: alias '%s' requires that " 296 "a node be placed in the list in a " 297 "position which is already filled by " 298 "node '%s'\n", __func__, path, 299 fdt_get_name(blob, node, NULL)); 300 continue; 301 } 302 node_list[number] = node; 303 if (number >= num_found) 304 num_found = number + 1; 305 } 306 nodes[found] = 0; 307 } 308 309 /* Add any nodes not mentioned by an alias */ 310 for (i = j = 0; i < maxcount; i++) { 311 if (!node_list[i]) { 312 for (; j < maxcount; j++) 313 if (nodes[j] && 314 fdtdec_get_is_enabled(blob, nodes[j])) 315 break; 316 317 /* Have we run out of nodes to add? */ 318 if (j == maxcount) 319 break; 320 321 assert(!node_list[i]); 322 node_list[i] = nodes[j++]; 323 if (i >= num_found) 324 num_found = i + 1; 325 } 326 } 327 328 return num_found; 329 } 330 331 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 332 int *seqp) 333 { 334 int base_len = strlen(base); 335 const char *find_name; 336 int find_namelen; 337 int prop_offset; 338 int aliases; 339 340 find_name = fdt_get_name(blob, offset, &find_namelen); 341 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 342 343 aliases = fdt_path_offset(blob, "/aliases"); 344 for (prop_offset = fdt_first_property_offset(blob, aliases); 345 prop_offset > 0; 346 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 347 const char *prop; 348 const char *name; 349 const char *slash; 350 const char *p; 351 int len; 352 353 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 354 debug(" - %s, %s\n", name, prop); 355 if (len < find_namelen || *prop != '/' || prop[len - 1] || 356 strncmp(name, base, base_len)) 357 continue; 358 359 slash = strrchr(prop, '/'); 360 if (strcmp(slash + 1, find_name)) 361 continue; 362 for (p = name + strlen(name) - 1; p > name; p--) { 363 if (!isdigit(*p)) { 364 *seqp = simple_strtoul(p + 1, NULL, 10); 365 debug("Found seq %d\n", *seqp); 366 return 0; 367 } 368 } 369 } 370 371 debug("Not found\n"); 372 return -ENOENT; 373 } 374 375 int fdtdec_get_alias_node(const void *blob, const char *name) 376 { 377 const char *prop; 378 int alias_node; 379 int len; 380 381 if (!blob) 382 return -FDT_ERR_NOTFOUND; 383 alias_node = fdt_path_offset(blob, "/aliases"); 384 prop = fdt_getprop(blob, alias_node, name, &len); 385 if (!prop) 386 return -FDT_ERR_NOTFOUND; 387 return fdt_path_offset(blob, prop); 388 } 389 390 int fdtdec_get_chosen_node(const void *blob, const char *name) 391 { 392 const char *prop; 393 int chosen_node; 394 int len; 395 396 if (!blob) 397 return -FDT_ERR_NOTFOUND; 398 chosen_node = fdt_path_offset(blob, "/chosen"); 399 prop = fdt_getprop(blob, chosen_node, name, &len); 400 if (!prop) 401 return -FDT_ERR_NOTFOUND; 402 return fdt_path_offset(blob, prop); 403 } 404 405 int fdtdec_check_fdt(void) 406 { 407 /* 408 * We must have an FDT, but we cannot panic() yet since the console 409 * is not ready. So for now, just assert(). Boards which need an early 410 * FDT (prior to console ready) will need to make their own 411 * arrangements and do their own checks. 412 */ 413 assert(!fdtdec_prepare_fdt()); 414 return 0; 415 } 416 417 /* 418 * This function is a little odd in that it accesses global data. At some 419 * point if the architecture board.c files merge this will make more sense. 420 * Even now, it is common code. 421 */ 422 int fdtdec_prepare_fdt(void) 423 { 424 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 425 fdt_check_header(gd->fdt_blob)) { 426 printf("No valid FDT found - please append one to U-Boot " 427 "binary, use u-boot-dtb.bin or define " 428 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 429 return -1; 430 } 431 return 0; 432 } 433 434 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 435 { 436 const u32 *phandle; 437 int lookup; 438 439 debug("%s: %s\n", __func__, prop_name); 440 phandle = fdt_getprop(blob, node, prop_name, NULL); 441 if (!phandle) 442 return -FDT_ERR_NOTFOUND; 443 444 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 445 return lookup; 446 } 447 448 /** 449 * Look up a property in a node and check that it has a minimum length. 450 * 451 * @param blob FDT blob 452 * @param node node to examine 453 * @param prop_name name of property to find 454 * @param min_len minimum property length in bytes 455 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 456 found, or -FDT_ERR_BADLAYOUT if not enough data 457 * @return pointer to cell, which is only valid if err == 0 458 */ 459 static const void *get_prop_check_min_len(const void *blob, int node, 460 const char *prop_name, int min_len, int *err) 461 { 462 const void *cell; 463 int len; 464 465 debug("%s: %s\n", __func__, prop_name); 466 cell = fdt_getprop(blob, node, prop_name, &len); 467 if (!cell) 468 *err = -FDT_ERR_NOTFOUND; 469 else if (len < min_len) 470 *err = -FDT_ERR_BADLAYOUT; 471 else 472 *err = 0; 473 return cell; 474 } 475 476 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 477 u32 *array, int count) 478 { 479 const u32 *cell; 480 int i, err = 0; 481 482 debug("%s: %s\n", __func__, prop_name); 483 cell = get_prop_check_min_len(blob, node, prop_name, 484 sizeof(u32) * count, &err); 485 if (!err) { 486 for (i = 0; i < count; i++) 487 array[i] = fdt32_to_cpu(cell[i]); 488 } 489 return err; 490 } 491 492 int fdtdec_get_int_array_count(const void *blob, int node, 493 const char *prop_name, u32 *array, int count) 494 { 495 const u32 *cell; 496 int len, elems; 497 int i; 498 499 debug("%s: %s\n", __func__, prop_name); 500 cell = fdt_getprop(blob, node, prop_name, &len); 501 if (!cell) 502 return -FDT_ERR_NOTFOUND; 503 elems = len / sizeof(u32); 504 if (count > elems) 505 count = elems; 506 for (i = 0; i < count; i++) 507 array[i] = fdt32_to_cpu(cell[i]); 508 509 return count; 510 } 511 512 const u32 *fdtdec_locate_array(const void *blob, int node, 513 const char *prop_name, int count) 514 { 515 const u32 *cell; 516 int err; 517 518 cell = get_prop_check_min_len(blob, node, prop_name, 519 sizeof(u32) * count, &err); 520 return err ? NULL : cell; 521 } 522 523 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 524 { 525 const s32 *cell; 526 int len; 527 528 debug("%s: %s\n", __func__, prop_name); 529 cell = fdt_getprop(blob, node, prop_name, &len); 530 return cell != NULL; 531 } 532 533 /** 534 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 535 * terminating item. 536 * 537 * @param blob FDT blob to use 538 * @param node Node to look at 539 * @param prop_name Node property name 540 * @param gpio Array of gpio elements to fill from FDT. This will be 541 * untouched if either 0 or an error is returned 542 * @param max_count Maximum number of elements allowed 543 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 544 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 545 */ 546 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 547 struct fdt_gpio_state *gpio, int max_count) 548 { 549 const struct fdt_property *prop; 550 const u32 *cell; 551 const char *name; 552 int len, i; 553 554 debug("%s: %s\n", __func__, prop_name); 555 assert(max_count > 0); 556 prop = fdt_get_property(blob, node, prop_name, &len); 557 if (!prop) { 558 debug("%s: property '%s' missing\n", __func__, prop_name); 559 return -FDT_ERR_NOTFOUND; 560 } 561 562 /* We will use the name to tag the GPIO */ 563 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 564 cell = (u32 *)prop->data; 565 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 566 if (len > max_count) { 567 debug(" %s: too many GPIOs / cells for " 568 "property '%s'\n", __func__, prop_name); 569 return -FDT_ERR_BADLAYOUT; 570 } 571 572 /* Read out the GPIO data from the cells */ 573 for (i = 0; i < len; i++, cell += 3) { 574 gpio[i].gpio = fdt32_to_cpu(cell[1]); 575 gpio[i].flags = fdt32_to_cpu(cell[2]); 576 gpio[i].name = name; 577 } 578 579 return len; 580 } 581 582 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 583 struct fdt_gpio_state *gpio) 584 { 585 int err; 586 587 debug("%s: %s\n", __func__, prop_name); 588 gpio->gpio = FDT_GPIO_NONE; 589 gpio->name = NULL; 590 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 591 return err == 1 ? 0 : err; 592 } 593 594 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 595 { 596 int val; 597 598 if (!fdt_gpio_isvalid(gpio)) 599 return -1; 600 601 val = gpio_get_value(gpio->gpio); 602 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 603 } 604 605 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 606 { 607 if (!fdt_gpio_isvalid(gpio)) 608 return -1; 609 610 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 611 return gpio_set_value(gpio->gpio, val); 612 } 613 614 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 615 { 616 /* 617 * Return success if there is no GPIO defined. This is used for 618 * optional GPIOs) 619 */ 620 if (!fdt_gpio_isvalid(gpio)) 621 return 0; 622 623 if (gpio_request(gpio->gpio, gpio->name)) 624 return -1; 625 return 0; 626 } 627 628 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 629 u8 *array, int count) 630 { 631 const u8 *cell; 632 int err; 633 634 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 635 if (!err) 636 memcpy(array, cell, count); 637 return err; 638 } 639 640 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 641 const char *prop_name, int count) 642 { 643 const u8 *cell; 644 int err; 645 646 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 647 if (err) 648 return NULL; 649 return cell; 650 } 651 652 int fdtdec_get_config_int(const void *blob, const char *prop_name, 653 int default_val) 654 { 655 int config_node; 656 657 debug("%s: %s\n", __func__, prop_name); 658 config_node = fdt_path_offset(blob, "/config"); 659 if (config_node < 0) 660 return default_val; 661 return fdtdec_get_int(blob, config_node, prop_name, default_val); 662 } 663 664 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 665 { 666 int config_node; 667 const void *prop; 668 669 debug("%s: %s\n", __func__, prop_name); 670 config_node = fdt_path_offset(blob, "/config"); 671 if (config_node < 0) 672 return 0; 673 prop = fdt_get_property(blob, config_node, prop_name, NULL); 674 675 return prop != NULL; 676 } 677 678 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 679 { 680 const char *nodep; 681 int nodeoffset; 682 int len; 683 684 debug("%s: %s\n", __func__, prop_name); 685 nodeoffset = fdt_path_offset(blob, "/config"); 686 if (nodeoffset < 0) 687 return NULL; 688 689 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 690 if (!nodep) 691 return NULL; 692 693 return (char *)nodep; 694 } 695 696 int fdtdec_decode_region(const void *blob, int node, 697 const char *prop_name, void **ptrp, size_t *size) 698 { 699 const fdt_addr_t *cell; 700 int len; 701 702 debug("%s: %s\n", __func__, prop_name); 703 cell = fdt_getprop(blob, node, prop_name, &len); 704 if (!cell || (len != sizeof(fdt_addr_t) * 2)) 705 return -1; 706 707 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size); 708 *size = fdt_size_to_cpu(cell[1]); 709 debug("%s: size=%zx\n", __func__, *size); 710 return 0; 711 } 712 713 /** 714 * Read a flash entry from the fdt 715 * 716 * @param blob FDT blob 717 * @param node Offset of node to read 718 * @param name Name of node being read 719 * @param entry Place to put offset and size of this node 720 * @return 0 if ok, -ve on error 721 */ 722 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 723 struct fmap_entry *entry) 724 { 725 u32 reg[2]; 726 727 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 728 debug("Node '%s' has bad/missing 'reg' property\n", name); 729 return -FDT_ERR_NOTFOUND; 730 } 731 entry->offset = reg[0]; 732 entry->length = reg[1]; 733 734 return 0; 735 } 736 737 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 738 { 739 u64 number = 0; 740 741 while (cells--) 742 number = (number << 32) | fdt32_to_cpu(*ptr++); 743 744 return number; 745 } 746 747 int fdt_get_resource(const void *fdt, int node, const char *property, 748 unsigned int index, struct fdt_resource *res) 749 { 750 const fdt32_t *ptr, *end; 751 int na, ns, len, parent; 752 unsigned int i = 0; 753 754 parent = fdt_parent_offset(fdt, node); 755 if (parent < 0) 756 return parent; 757 758 na = fdt_address_cells(fdt, parent); 759 ns = fdt_size_cells(fdt, parent); 760 761 ptr = fdt_getprop(fdt, node, property, &len); 762 if (!ptr) 763 return len; 764 765 end = ptr + len / sizeof(*ptr); 766 767 while (ptr + na + ns <= end) { 768 if (i == index) { 769 res->start = res->end = fdtdec_get_number(ptr, na); 770 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 771 return 0; 772 } 773 774 ptr += na + ns; 775 i++; 776 } 777 778 return -FDT_ERR_NOTFOUND; 779 } 780 781 int fdt_get_named_resource(const void *fdt, int node, const char *property, 782 const char *prop_names, const char *name, 783 struct fdt_resource *res) 784 { 785 int index; 786 787 index = fdt_find_string(fdt, node, prop_names, name); 788 if (index < 0) 789 return index; 790 791 return fdt_get_resource(fdt, node, property, index, res); 792 } 793 794 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) 795 { 796 const fdt32_t *prop; 797 int len; 798 799 prop = fdt_getprop(fdt, node, "reg", &len); 800 if (!prop) 801 return len; 802 803 *bdf = fdt32_to_cpu(*prop) & 0xffffff; 804 805 return 0; 806 } 807 #endif 808