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 COMPAT(INTEL_GMA, "intel,gma"), 81 }; 82 83 const char *fdtdec_get_compatible(enum fdt_compat_id id) 84 { 85 /* We allow reading of the 'unknown' ID for testing purposes */ 86 assert(id >= 0 && id < COMPAT_COUNT); 87 return compat_names[id]; 88 } 89 90 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 91 const char *prop_name, fdt_size_t *sizep) 92 { 93 const fdt_addr_t *cell; 94 int len; 95 96 debug("%s: %s: ", __func__, prop_name); 97 cell = fdt_getprop(blob, node, prop_name, &len); 98 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 99 len == sizeof(fdt_addr_t) * 2)) { 100 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 101 if (sizep) { 102 const fdt_size_t *size; 103 104 size = (fdt_size_t *)((char *)cell + 105 sizeof(fdt_addr_t)); 106 *sizep = fdt_size_to_cpu(*size); 107 debug("addr=%08lx, size=%08x\n", 108 (ulong)addr, *sizep); 109 } else { 110 debug("%08lx\n", (ulong)addr); 111 } 112 return addr; 113 } 114 debug("(not found)\n"); 115 return FDT_ADDR_T_NONE; 116 } 117 118 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 119 const char *prop_name) 120 { 121 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 122 } 123 124 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 125 uint64_t default_val) 126 { 127 const uint64_t *cell64; 128 int length; 129 130 cell64 = fdt_getprop(blob, node, prop_name, &length); 131 if (!cell64 || length < sizeof(*cell64)) 132 return default_val; 133 134 return fdt64_to_cpu(*cell64); 135 } 136 137 int fdtdec_get_is_enabled(const void *blob, int node) 138 { 139 const char *cell; 140 141 /* 142 * It should say "okay", so only allow that. Some fdts use "ok" but 143 * this is a bug. Please fix your device tree source file. See here 144 * for discussion: 145 * 146 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 147 */ 148 cell = fdt_getprop(blob, node, "status", NULL); 149 if (cell) 150 return 0 == strcmp(cell, "okay"); 151 return 1; 152 } 153 154 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 155 { 156 enum fdt_compat_id id; 157 158 /* Search our drivers */ 159 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 160 if (0 == fdt_node_check_compatible(blob, node, 161 compat_names[id])) 162 return id; 163 return COMPAT_UNKNOWN; 164 } 165 166 int fdtdec_next_compatible(const void *blob, int node, 167 enum fdt_compat_id id) 168 { 169 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 170 } 171 172 int fdtdec_next_compatible_subnode(const void *blob, int node, 173 enum fdt_compat_id id, int *depthp) 174 { 175 do { 176 node = fdt_next_node(blob, node, depthp); 177 } while (*depthp > 1); 178 179 /* If this is a direct subnode, and compatible, return it */ 180 if (*depthp == 1 && 0 == fdt_node_check_compatible( 181 blob, node, compat_names[id])) 182 return node; 183 184 return -FDT_ERR_NOTFOUND; 185 } 186 187 int fdtdec_next_alias(const void *blob, const char *name, 188 enum fdt_compat_id id, int *upto) 189 { 190 #define MAX_STR_LEN 20 191 char str[MAX_STR_LEN + 20]; 192 int node, err; 193 194 /* snprintf() is not available */ 195 assert(strlen(name) < MAX_STR_LEN); 196 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 197 node = fdt_path_offset(blob, str); 198 if (node < 0) 199 return node; 200 err = fdt_node_check_compatible(blob, node, compat_names[id]); 201 if (err < 0) 202 return err; 203 if (err) 204 return -FDT_ERR_NOTFOUND; 205 (*upto)++; 206 return node; 207 } 208 209 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 210 enum fdt_compat_id id, int *node_list, int maxcount) 211 { 212 memset(node_list, '\0', sizeof(*node_list) * maxcount); 213 214 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 215 } 216 217 /* TODO: Can we tighten this code up a little? */ 218 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 219 enum fdt_compat_id id, int *node_list, int maxcount) 220 { 221 int name_len = strlen(name); 222 int nodes[maxcount]; 223 int num_found = 0; 224 int offset, node; 225 int alias_node; 226 int count; 227 int i, j; 228 229 /* find the alias node if present */ 230 alias_node = fdt_path_offset(blob, "/aliases"); 231 232 /* 233 * start with nothing, and we can assume that the root node can't 234 * match 235 */ 236 memset(nodes, '\0', sizeof(nodes)); 237 238 /* First find all the compatible nodes */ 239 for (node = count = 0; node >= 0 && count < maxcount;) { 240 node = fdtdec_next_compatible(blob, node, id); 241 if (node >= 0) 242 nodes[count++] = node; 243 } 244 if (node >= 0) 245 debug("%s: warning: maxcount exceeded with alias '%s'\n", 246 __func__, name); 247 248 /* Now find all the aliases */ 249 for (offset = fdt_first_property_offset(blob, alias_node); 250 offset > 0; 251 offset = fdt_next_property_offset(blob, offset)) { 252 const struct fdt_property *prop; 253 const char *path; 254 int number; 255 int found; 256 257 node = 0; 258 prop = fdt_get_property_by_offset(blob, offset, NULL); 259 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 260 if (prop->len && 0 == strncmp(path, name, name_len)) 261 node = fdt_path_offset(blob, prop->data); 262 if (node <= 0) 263 continue; 264 265 /* Get the alias number */ 266 number = simple_strtoul(path + name_len, NULL, 10); 267 if (number < 0 || number >= maxcount) { 268 debug("%s: warning: alias '%s' is out of range\n", 269 __func__, path); 270 continue; 271 } 272 273 /* Make sure the node we found is actually in our list! */ 274 found = -1; 275 for (j = 0; j < count; j++) 276 if (nodes[j] == node) { 277 found = j; 278 break; 279 } 280 281 if (found == -1) { 282 debug("%s: warning: alias '%s' points to a node " 283 "'%s' that is missing or is not compatible " 284 " with '%s'\n", __func__, path, 285 fdt_get_name(blob, node, NULL), 286 compat_names[id]); 287 continue; 288 } 289 290 /* 291 * Add this node to our list in the right place, and mark 292 * it as done. 293 */ 294 if (fdtdec_get_is_enabled(blob, node)) { 295 if (node_list[number]) { 296 debug("%s: warning: alias '%s' requires that " 297 "a node be placed in the list in a " 298 "position which is already filled by " 299 "node '%s'\n", __func__, path, 300 fdt_get_name(blob, node, NULL)); 301 continue; 302 } 303 node_list[number] = node; 304 if (number >= num_found) 305 num_found = number + 1; 306 } 307 nodes[found] = 0; 308 } 309 310 /* Add any nodes not mentioned by an alias */ 311 for (i = j = 0; i < maxcount; i++) { 312 if (!node_list[i]) { 313 for (; j < maxcount; j++) 314 if (nodes[j] && 315 fdtdec_get_is_enabled(blob, nodes[j])) 316 break; 317 318 /* Have we run out of nodes to add? */ 319 if (j == maxcount) 320 break; 321 322 assert(!node_list[i]); 323 node_list[i] = nodes[j++]; 324 if (i >= num_found) 325 num_found = i + 1; 326 } 327 } 328 329 return num_found; 330 } 331 332 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 333 int *seqp) 334 { 335 int base_len = strlen(base); 336 const char *find_name; 337 int find_namelen; 338 int prop_offset; 339 int aliases; 340 341 find_name = fdt_get_name(blob, offset, &find_namelen); 342 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 343 344 aliases = fdt_path_offset(blob, "/aliases"); 345 for (prop_offset = fdt_first_property_offset(blob, aliases); 346 prop_offset > 0; 347 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 348 const char *prop; 349 const char *name; 350 const char *slash; 351 const char *p; 352 int len; 353 354 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 355 debug(" - %s, %s\n", name, prop); 356 if (len < find_namelen || *prop != '/' || prop[len - 1] || 357 strncmp(name, base, base_len)) 358 continue; 359 360 slash = strrchr(prop, '/'); 361 if (strcmp(slash + 1, find_name)) 362 continue; 363 for (p = name + strlen(name) - 1; p > name; p--) { 364 if (!isdigit(*p)) { 365 *seqp = simple_strtoul(p + 1, NULL, 10); 366 debug("Found seq %d\n", *seqp); 367 return 0; 368 } 369 } 370 } 371 372 debug("Not found\n"); 373 return -ENOENT; 374 } 375 376 int fdtdec_get_alias_node(const void *blob, const char *name) 377 { 378 const char *prop; 379 int alias_node; 380 int len; 381 382 if (!blob) 383 return -FDT_ERR_NOTFOUND; 384 alias_node = fdt_path_offset(blob, "/aliases"); 385 prop = fdt_getprop(blob, alias_node, name, &len); 386 if (!prop) 387 return -FDT_ERR_NOTFOUND; 388 return fdt_path_offset(blob, prop); 389 } 390 391 int fdtdec_get_chosen_node(const void *blob, const char *name) 392 { 393 const char *prop; 394 int chosen_node; 395 int len; 396 397 if (!blob) 398 return -FDT_ERR_NOTFOUND; 399 chosen_node = fdt_path_offset(blob, "/chosen"); 400 prop = fdt_getprop(blob, chosen_node, name, &len); 401 if (!prop) 402 return -FDT_ERR_NOTFOUND; 403 return fdt_path_offset(blob, prop); 404 } 405 406 int fdtdec_check_fdt(void) 407 { 408 /* 409 * We must have an FDT, but we cannot panic() yet since the console 410 * is not ready. So for now, just assert(). Boards which need an early 411 * FDT (prior to console ready) will need to make their own 412 * arrangements and do their own checks. 413 */ 414 assert(!fdtdec_prepare_fdt()); 415 return 0; 416 } 417 418 /* 419 * This function is a little odd in that it accesses global data. At some 420 * point if the architecture board.c files merge this will make more sense. 421 * Even now, it is common code. 422 */ 423 int fdtdec_prepare_fdt(void) 424 { 425 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 426 fdt_check_header(gd->fdt_blob)) { 427 printf("No valid FDT found - please append one to U-Boot " 428 "binary, use u-boot-dtb.bin or define " 429 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 430 return -1; 431 } 432 return 0; 433 } 434 435 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 436 { 437 const u32 *phandle; 438 int lookup; 439 440 debug("%s: %s\n", __func__, prop_name); 441 phandle = fdt_getprop(blob, node, prop_name, NULL); 442 if (!phandle) 443 return -FDT_ERR_NOTFOUND; 444 445 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 446 return lookup; 447 } 448 449 /** 450 * Look up a property in a node and check that it has a minimum length. 451 * 452 * @param blob FDT blob 453 * @param node node to examine 454 * @param prop_name name of property to find 455 * @param min_len minimum property length in bytes 456 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 457 found, or -FDT_ERR_BADLAYOUT if not enough data 458 * @return pointer to cell, which is only valid if err == 0 459 */ 460 static const void *get_prop_check_min_len(const void *blob, int node, 461 const char *prop_name, int min_len, int *err) 462 { 463 const void *cell; 464 int len; 465 466 debug("%s: %s\n", __func__, prop_name); 467 cell = fdt_getprop(blob, node, prop_name, &len); 468 if (!cell) 469 *err = -FDT_ERR_NOTFOUND; 470 else if (len < min_len) 471 *err = -FDT_ERR_BADLAYOUT; 472 else 473 *err = 0; 474 return cell; 475 } 476 477 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 478 u32 *array, int count) 479 { 480 const u32 *cell; 481 int i, err = 0; 482 483 debug("%s: %s\n", __func__, prop_name); 484 cell = get_prop_check_min_len(blob, node, prop_name, 485 sizeof(u32) * count, &err); 486 if (!err) { 487 for (i = 0; i < count; i++) 488 array[i] = fdt32_to_cpu(cell[i]); 489 } 490 return err; 491 } 492 493 int fdtdec_get_int_array_count(const void *blob, int node, 494 const char *prop_name, u32 *array, int count) 495 { 496 const u32 *cell; 497 int len, elems; 498 int i; 499 500 debug("%s: %s\n", __func__, prop_name); 501 cell = fdt_getprop(blob, node, prop_name, &len); 502 if (!cell) 503 return -FDT_ERR_NOTFOUND; 504 elems = len / sizeof(u32); 505 if (count > elems) 506 count = elems; 507 for (i = 0; i < count; i++) 508 array[i] = fdt32_to_cpu(cell[i]); 509 510 return count; 511 } 512 513 const u32 *fdtdec_locate_array(const void *blob, int node, 514 const char *prop_name, int count) 515 { 516 const u32 *cell; 517 int err; 518 519 cell = get_prop_check_min_len(blob, node, prop_name, 520 sizeof(u32) * count, &err); 521 return err ? NULL : cell; 522 } 523 524 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 525 { 526 const s32 *cell; 527 int len; 528 529 debug("%s: %s\n", __func__, prop_name); 530 cell = fdt_getprop(blob, node, prop_name, &len); 531 return cell != NULL; 532 } 533 534 /** 535 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 536 * terminating item. 537 * 538 * @param blob FDT blob to use 539 * @param node Node to look at 540 * @param prop_name Node property name 541 * @param gpio Array of gpio elements to fill from FDT. This will be 542 * untouched if either 0 or an error is returned 543 * @param max_count Maximum number of elements allowed 544 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 545 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 546 */ 547 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 548 struct fdt_gpio_state *gpio, int max_count) 549 { 550 const struct fdt_property *prop; 551 const u32 *cell; 552 const char *name; 553 int len, i; 554 555 debug("%s: %s\n", __func__, prop_name); 556 assert(max_count > 0); 557 prop = fdt_get_property(blob, node, prop_name, &len); 558 if (!prop) { 559 debug("%s: property '%s' missing\n", __func__, prop_name); 560 return -FDT_ERR_NOTFOUND; 561 } 562 563 /* We will use the name to tag the GPIO */ 564 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 565 cell = (u32 *)prop->data; 566 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 567 if (len > max_count) { 568 debug(" %s: too many GPIOs / cells for " 569 "property '%s'\n", __func__, prop_name); 570 return -FDT_ERR_BADLAYOUT; 571 } 572 573 /* Read out the GPIO data from the cells */ 574 for (i = 0; i < len; i++, cell += 3) { 575 gpio[i].gpio = fdt32_to_cpu(cell[1]); 576 gpio[i].flags = fdt32_to_cpu(cell[2]); 577 gpio[i].name = name; 578 } 579 580 return len; 581 } 582 583 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 584 struct fdt_gpio_state *gpio) 585 { 586 int err; 587 588 debug("%s: %s\n", __func__, prop_name); 589 gpio->gpio = FDT_GPIO_NONE; 590 gpio->name = NULL; 591 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 592 return err == 1 ? 0 : err; 593 } 594 595 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 596 { 597 int val; 598 599 if (!fdt_gpio_isvalid(gpio)) 600 return -1; 601 602 val = gpio_get_value(gpio->gpio); 603 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 604 } 605 606 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 607 { 608 if (!fdt_gpio_isvalid(gpio)) 609 return -1; 610 611 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 612 return gpio_set_value(gpio->gpio, val); 613 } 614 615 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 616 { 617 /* 618 * Return success if there is no GPIO defined. This is used for 619 * optional GPIOs) 620 */ 621 if (!fdt_gpio_isvalid(gpio)) 622 return 0; 623 624 if (gpio_request(gpio->gpio, gpio->name)) 625 return -1; 626 return 0; 627 } 628 629 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 630 u8 *array, int count) 631 { 632 const u8 *cell; 633 int err; 634 635 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 636 if (!err) 637 memcpy(array, cell, count); 638 return err; 639 } 640 641 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 642 const char *prop_name, int count) 643 { 644 const u8 *cell; 645 int err; 646 647 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 648 if (err) 649 return NULL; 650 return cell; 651 } 652 653 int fdtdec_get_config_int(const void *blob, const char *prop_name, 654 int default_val) 655 { 656 int config_node; 657 658 debug("%s: %s\n", __func__, prop_name); 659 config_node = fdt_path_offset(blob, "/config"); 660 if (config_node < 0) 661 return default_val; 662 return fdtdec_get_int(blob, config_node, prop_name, default_val); 663 } 664 665 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 666 { 667 int config_node; 668 const void *prop; 669 670 debug("%s: %s\n", __func__, prop_name); 671 config_node = fdt_path_offset(blob, "/config"); 672 if (config_node < 0) 673 return 0; 674 prop = fdt_get_property(blob, config_node, prop_name, NULL); 675 676 return prop != NULL; 677 } 678 679 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 680 { 681 const char *nodep; 682 int nodeoffset; 683 int len; 684 685 debug("%s: %s\n", __func__, prop_name); 686 nodeoffset = fdt_path_offset(blob, "/config"); 687 if (nodeoffset < 0) 688 return NULL; 689 690 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 691 if (!nodep) 692 return NULL; 693 694 return (char *)nodep; 695 } 696 697 int fdtdec_decode_region(const void *blob, int node, 698 const char *prop_name, void **ptrp, size_t *size) 699 { 700 const fdt_addr_t *cell; 701 int len; 702 703 debug("%s: %s\n", __func__, prop_name); 704 cell = fdt_getprop(blob, node, prop_name, &len); 705 if (!cell || (len != sizeof(fdt_addr_t) * 2)) 706 return -1; 707 708 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size); 709 *size = fdt_size_to_cpu(cell[1]); 710 debug("%s: size=%zx\n", __func__, *size); 711 return 0; 712 } 713 714 /** 715 * Read a flash entry from the fdt 716 * 717 * @param blob FDT blob 718 * @param node Offset of node to read 719 * @param name Name of node being read 720 * @param entry Place to put offset and size of this node 721 * @return 0 if ok, -ve on error 722 */ 723 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 724 struct fmap_entry *entry) 725 { 726 u32 reg[2]; 727 728 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 729 debug("Node '%s' has bad/missing 'reg' property\n", name); 730 return -FDT_ERR_NOTFOUND; 731 } 732 entry->offset = reg[0]; 733 entry->length = reg[1]; 734 735 return 0; 736 } 737 738 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 739 { 740 u64 number = 0; 741 742 while (cells--) 743 number = (number << 32) | fdt32_to_cpu(*ptr++); 744 745 return number; 746 } 747 748 int fdt_get_resource(const void *fdt, int node, const char *property, 749 unsigned int index, struct fdt_resource *res) 750 { 751 const fdt32_t *ptr, *end; 752 int na, ns, len, parent; 753 unsigned int i = 0; 754 755 parent = fdt_parent_offset(fdt, node); 756 if (parent < 0) 757 return parent; 758 759 na = fdt_address_cells(fdt, parent); 760 ns = fdt_size_cells(fdt, parent); 761 762 ptr = fdt_getprop(fdt, node, property, &len); 763 if (!ptr) 764 return len; 765 766 end = ptr + len / sizeof(*ptr); 767 768 while (ptr + na + ns <= end) { 769 if (i == index) { 770 res->start = res->end = fdtdec_get_number(ptr, na); 771 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 772 return 0; 773 } 774 775 ptr += na + ns; 776 i++; 777 } 778 779 return -FDT_ERR_NOTFOUND; 780 } 781 782 int fdt_get_named_resource(const void *fdt, int node, const char *property, 783 const char *prop_names, const char *name, 784 struct fdt_resource *res) 785 { 786 int index; 787 788 index = fdt_find_string(fdt, node, prop_names, name); 789 if (index < 0) 790 return index; 791 792 return fdt_get_resource(fdt, node, property, index, res); 793 } 794 795 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) 796 { 797 const fdt32_t *prop; 798 int len; 799 800 prop = fdt_getprop(fdt, node, "reg", &len); 801 if (!prop) 802 return len; 803 804 *bdf = fdt32_to_cpu(*prop) & 0xffffff; 805 806 return 0; 807 } 808 #endif 809