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