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 }; 79 80 const char *fdtdec_get_compatible(enum fdt_compat_id id) 81 { 82 /* We allow reading of the 'unknown' ID for testing purposes */ 83 assert(id >= 0 && id < COMPAT_COUNT); 84 return compat_names[id]; 85 } 86 87 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 88 const char *prop_name, fdt_size_t *sizep) 89 { 90 const fdt_addr_t *cell; 91 int len; 92 93 debug("%s: %s: ", __func__, prop_name); 94 cell = fdt_getprop(blob, node, prop_name, &len); 95 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 96 len == sizeof(fdt_addr_t) * 2)) { 97 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 98 if (sizep) { 99 const fdt_size_t *size; 100 101 size = (fdt_size_t *)((char *)cell + 102 sizeof(fdt_addr_t)); 103 *sizep = fdt_size_to_cpu(*size); 104 debug("addr=%08lx, size=%08x\n", 105 (ulong)addr, *sizep); 106 } else { 107 debug("%08lx\n", (ulong)addr); 108 } 109 return addr; 110 } 111 debug("(not found)\n"); 112 return FDT_ADDR_T_NONE; 113 } 114 115 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 116 const char *prop_name) 117 { 118 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 119 } 120 121 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 122 uint64_t default_val) 123 { 124 const uint64_t *cell64; 125 int length; 126 127 cell64 = fdt_getprop(blob, node, prop_name, &length); 128 if (!cell64 || length < sizeof(*cell64)) 129 return default_val; 130 131 return fdt64_to_cpu(*cell64); 132 } 133 134 int fdtdec_get_is_enabled(const void *blob, int node) 135 { 136 const char *cell; 137 138 /* 139 * It should say "okay", so only allow that. Some fdts use "ok" but 140 * this is a bug. Please fix your device tree source file. See here 141 * for discussion: 142 * 143 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 144 */ 145 cell = fdt_getprop(blob, node, "status", NULL); 146 if (cell) 147 return 0 == strcmp(cell, "okay"); 148 return 1; 149 } 150 151 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 152 { 153 enum fdt_compat_id id; 154 155 /* Search our drivers */ 156 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 157 if (0 == fdt_node_check_compatible(blob, node, 158 compat_names[id])) 159 return id; 160 return COMPAT_UNKNOWN; 161 } 162 163 int fdtdec_next_compatible(const void *blob, int node, 164 enum fdt_compat_id id) 165 { 166 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 167 } 168 169 int fdtdec_next_compatible_subnode(const void *blob, int node, 170 enum fdt_compat_id id, int *depthp) 171 { 172 do { 173 node = fdt_next_node(blob, node, depthp); 174 } while (*depthp > 1); 175 176 /* If this is a direct subnode, and compatible, return it */ 177 if (*depthp == 1 && 0 == fdt_node_check_compatible( 178 blob, node, compat_names[id])) 179 return node; 180 181 return -FDT_ERR_NOTFOUND; 182 } 183 184 int fdtdec_next_alias(const void *blob, const char *name, 185 enum fdt_compat_id id, int *upto) 186 { 187 #define MAX_STR_LEN 20 188 char str[MAX_STR_LEN + 20]; 189 int node, err; 190 191 /* snprintf() is not available */ 192 assert(strlen(name) < MAX_STR_LEN); 193 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 194 node = fdt_path_offset(blob, str); 195 if (node < 0) 196 return node; 197 err = fdt_node_check_compatible(blob, node, compat_names[id]); 198 if (err < 0) 199 return err; 200 if (err) 201 return -FDT_ERR_NOTFOUND; 202 (*upto)++; 203 return node; 204 } 205 206 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 207 enum fdt_compat_id id, int *node_list, int maxcount) 208 { 209 memset(node_list, '\0', sizeof(*node_list) * maxcount); 210 211 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 212 } 213 214 /* TODO: Can we tighten this code up a little? */ 215 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 216 enum fdt_compat_id id, int *node_list, int maxcount) 217 { 218 int name_len = strlen(name); 219 int nodes[maxcount]; 220 int num_found = 0; 221 int offset, node; 222 int alias_node; 223 int count; 224 int i, j; 225 226 /* find the alias node if present */ 227 alias_node = fdt_path_offset(blob, "/aliases"); 228 229 /* 230 * start with nothing, and we can assume that the root node can't 231 * match 232 */ 233 memset(nodes, '\0', sizeof(nodes)); 234 235 /* First find all the compatible nodes */ 236 for (node = count = 0; node >= 0 && count < maxcount;) { 237 node = fdtdec_next_compatible(blob, node, id); 238 if (node >= 0) 239 nodes[count++] = node; 240 } 241 if (node >= 0) 242 debug("%s: warning: maxcount exceeded with alias '%s'\n", 243 __func__, name); 244 245 /* Now find all the aliases */ 246 for (offset = fdt_first_property_offset(blob, alias_node); 247 offset > 0; 248 offset = fdt_next_property_offset(blob, offset)) { 249 const struct fdt_property *prop; 250 const char *path; 251 int number; 252 int found; 253 254 node = 0; 255 prop = fdt_get_property_by_offset(blob, offset, NULL); 256 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 257 if (prop->len && 0 == strncmp(path, name, name_len)) 258 node = fdt_path_offset(blob, prop->data); 259 if (node <= 0) 260 continue; 261 262 /* Get the alias number */ 263 number = simple_strtoul(path + name_len, NULL, 10); 264 if (number < 0 || number >= maxcount) { 265 debug("%s: warning: alias '%s' is out of range\n", 266 __func__, path); 267 continue; 268 } 269 270 /* Make sure the node we found is actually in our list! */ 271 found = -1; 272 for (j = 0; j < count; j++) 273 if (nodes[j] == node) { 274 found = j; 275 break; 276 } 277 278 if (found == -1) { 279 debug("%s: warning: alias '%s' points to a node " 280 "'%s' that is missing or is not compatible " 281 " with '%s'\n", __func__, path, 282 fdt_get_name(blob, node, NULL), 283 compat_names[id]); 284 continue; 285 } 286 287 /* 288 * Add this node to our list in the right place, and mark 289 * it as done. 290 */ 291 if (fdtdec_get_is_enabled(blob, node)) { 292 if (node_list[number]) { 293 debug("%s: warning: alias '%s' requires that " 294 "a node be placed in the list in a " 295 "position which is already filled by " 296 "node '%s'\n", __func__, path, 297 fdt_get_name(blob, node, NULL)); 298 continue; 299 } 300 node_list[number] = node; 301 if (number >= num_found) 302 num_found = number + 1; 303 } 304 nodes[found] = 0; 305 } 306 307 /* Add any nodes not mentioned by an alias */ 308 for (i = j = 0; i < maxcount; i++) { 309 if (!node_list[i]) { 310 for (; j < maxcount; j++) 311 if (nodes[j] && 312 fdtdec_get_is_enabled(blob, nodes[j])) 313 break; 314 315 /* Have we run out of nodes to add? */ 316 if (j == maxcount) 317 break; 318 319 assert(!node_list[i]); 320 node_list[i] = nodes[j++]; 321 if (i >= num_found) 322 num_found = i + 1; 323 } 324 } 325 326 return num_found; 327 } 328 329 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 330 int *seqp) 331 { 332 int base_len = strlen(base); 333 const char *find_name; 334 int find_namelen; 335 int prop_offset; 336 int aliases; 337 338 find_name = fdt_get_name(blob, offset, &find_namelen); 339 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 340 341 aliases = fdt_path_offset(blob, "/aliases"); 342 for (prop_offset = fdt_first_property_offset(blob, aliases); 343 prop_offset > 0; 344 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 345 const char *prop; 346 const char *name; 347 const char *slash; 348 const char *p; 349 int len; 350 351 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 352 debug(" - %s, %s\n", name, prop); 353 if (len < find_namelen || *prop != '/' || prop[len - 1] || 354 strncmp(name, base, base_len)) 355 continue; 356 357 slash = strrchr(prop, '/'); 358 if (strcmp(slash + 1, find_name)) 359 continue; 360 for (p = name + strlen(name) - 1; p > name; p--) { 361 if (!isdigit(*p)) { 362 *seqp = simple_strtoul(p + 1, NULL, 10); 363 debug("Found seq %d\n", *seqp); 364 return 0; 365 } 366 } 367 } 368 369 debug("Not found\n"); 370 return -ENOENT; 371 } 372 373 int fdtdec_get_chosen_node(const void *blob, const char *name) 374 { 375 const char *prop; 376 int chosen_node; 377 int len; 378 379 if (!blob) 380 return -FDT_ERR_NOTFOUND; 381 chosen_node = fdt_path_offset(blob, "/chosen"); 382 prop = fdt_getprop(blob, chosen_node, name, &len); 383 if (!prop) 384 return -FDT_ERR_NOTFOUND; 385 return fdt_path_offset(blob, prop); 386 } 387 388 int fdtdec_check_fdt(void) 389 { 390 /* 391 * We must have an FDT, but we cannot panic() yet since the console 392 * is not ready. So for now, just assert(). Boards which need an early 393 * FDT (prior to console ready) will need to make their own 394 * arrangements and do their own checks. 395 */ 396 assert(!fdtdec_prepare_fdt()); 397 return 0; 398 } 399 400 /* 401 * This function is a little odd in that it accesses global data. At some 402 * point if the architecture board.c files merge this will make more sense. 403 * Even now, it is common code. 404 */ 405 int fdtdec_prepare_fdt(void) 406 { 407 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 408 fdt_check_header(gd->fdt_blob)) { 409 printf("No valid FDT found - please append one to U-Boot " 410 "binary, use u-boot-dtb.bin or define " 411 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 412 return -1; 413 } 414 return 0; 415 } 416 417 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 418 { 419 const u32 *phandle; 420 int lookup; 421 422 debug("%s: %s\n", __func__, prop_name); 423 phandle = fdt_getprop(blob, node, prop_name, NULL); 424 if (!phandle) 425 return -FDT_ERR_NOTFOUND; 426 427 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 428 return lookup; 429 } 430 431 /** 432 * Look up a property in a node and check that it has a minimum length. 433 * 434 * @param blob FDT blob 435 * @param node node to examine 436 * @param prop_name name of property to find 437 * @param min_len minimum property length in bytes 438 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 439 found, or -FDT_ERR_BADLAYOUT if not enough data 440 * @return pointer to cell, which is only valid if err == 0 441 */ 442 static const void *get_prop_check_min_len(const void *blob, int node, 443 const char *prop_name, int min_len, int *err) 444 { 445 const void *cell; 446 int len; 447 448 debug("%s: %s\n", __func__, prop_name); 449 cell = fdt_getprop(blob, node, prop_name, &len); 450 if (!cell) 451 *err = -FDT_ERR_NOTFOUND; 452 else if (len < min_len) 453 *err = -FDT_ERR_BADLAYOUT; 454 else 455 *err = 0; 456 return cell; 457 } 458 459 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 460 u32 *array, int count) 461 { 462 const u32 *cell; 463 int i, err = 0; 464 465 debug("%s: %s\n", __func__, prop_name); 466 cell = get_prop_check_min_len(blob, node, prop_name, 467 sizeof(u32) * count, &err); 468 if (!err) { 469 for (i = 0; i < count; i++) 470 array[i] = fdt32_to_cpu(cell[i]); 471 } 472 return err; 473 } 474 475 int fdtdec_get_int_array_count(const void *blob, int node, 476 const char *prop_name, u32 *array, int count) 477 { 478 const u32 *cell; 479 int len, elems; 480 int i; 481 482 debug("%s: %s\n", __func__, prop_name); 483 cell = fdt_getprop(blob, node, prop_name, &len); 484 if (!cell) 485 return -FDT_ERR_NOTFOUND; 486 elems = len / sizeof(u32); 487 if (count > elems) 488 count = elems; 489 for (i = 0; i < count; i++) 490 array[i] = fdt32_to_cpu(cell[i]); 491 492 return count; 493 } 494 495 const u32 *fdtdec_locate_array(const void *blob, int node, 496 const char *prop_name, int count) 497 { 498 const u32 *cell; 499 int err; 500 501 cell = get_prop_check_min_len(blob, node, prop_name, 502 sizeof(u32) * count, &err); 503 return err ? NULL : cell; 504 } 505 506 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 507 { 508 const s32 *cell; 509 int len; 510 511 debug("%s: %s\n", __func__, prop_name); 512 cell = fdt_getprop(blob, node, prop_name, &len); 513 return cell != NULL; 514 } 515 516 /** 517 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 518 * terminating item. 519 * 520 * @param blob FDT blob to use 521 * @param node Node to look at 522 * @param prop_name Node property name 523 * @param gpio Array of gpio elements to fill from FDT. This will be 524 * untouched if either 0 or an error is returned 525 * @param max_count Maximum number of elements allowed 526 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 527 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 528 */ 529 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 530 struct fdt_gpio_state *gpio, int max_count) 531 { 532 const struct fdt_property *prop; 533 const u32 *cell; 534 const char *name; 535 int len, i; 536 537 debug("%s: %s\n", __func__, prop_name); 538 assert(max_count > 0); 539 prop = fdt_get_property(blob, node, prop_name, &len); 540 if (!prop) { 541 debug("%s: property '%s' missing\n", __func__, prop_name); 542 return -FDT_ERR_NOTFOUND; 543 } 544 545 /* We will use the name to tag the GPIO */ 546 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 547 cell = (u32 *)prop->data; 548 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 549 if (len > max_count) { 550 debug(" %s: too many GPIOs / cells for " 551 "property '%s'\n", __func__, prop_name); 552 return -FDT_ERR_BADLAYOUT; 553 } 554 555 /* Read out the GPIO data from the cells */ 556 for (i = 0; i < len; i++, cell += 3) { 557 gpio[i].gpio = fdt32_to_cpu(cell[1]); 558 gpio[i].flags = fdt32_to_cpu(cell[2]); 559 gpio[i].name = name; 560 } 561 562 return len; 563 } 564 565 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 566 struct fdt_gpio_state *gpio) 567 { 568 int err; 569 570 debug("%s: %s\n", __func__, prop_name); 571 gpio->gpio = FDT_GPIO_NONE; 572 gpio->name = NULL; 573 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 574 return err == 1 ? 0 : err; 575 } 576 577 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 578 { 579 int val; 580 581 if (!fdt_gpio_isvalid(gpio)) 582 return -1; 583 584 val = gpio_get_value(gpio->gpio); 585 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 586 } 587 588 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 589 { 590 if (!fdt_gpio_isvalid(gpio)) 591 return -1; 592 593 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 594 return gpio_set_value(gpio->gpio, val); 595 } 596 597 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 598 { 599 /* 600 * Return success if there is no GPIO defined. This is used for 601 * optional GPIOs) 602 */ 603 if (!fdt_gpio_isvalid(gpio)) 604 return 0; 605 606 if (gpio_request(gpio->gpio, gpio->name)) 607 return -1; 608 return 0; 609 } 610 611 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 612 u8 *array, int count) 613 { 614 const u8 *cell; 615 int err; 616 617 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 618 if (!err) 619 memcpy(array, cell, count); 620 return err; 621 } 622 623 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 624 const char *prop_name, int count) 625 { 626 const u8 *cell; 627 int err; 628 629 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 630 if (err) 631 return NULL; 632 return cell; 633 } 634 635 int fdtdec_get_config_int(const void *blob, const char *prop_name, 636 int default_val) 637 { 638 int config_node; 639 640 debug("%s: %s\n", __func__, prop_name); 641 config_node = fdt_path_offset(blob, "/config"); 642 if (config_node < 0) 643 return default_val; 644 return fdtdec_get_int(blob, config_node, prop_name, default_val); 645 } 646 647 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 648 { 649 int config_node; 650 const void *prop; 651 652 debug("%s: %s\n", __func__, prop_name); 653 config_node = fdt_path_offset(blob, "/config"); 654 if (config_node < 0) 655 return 0; 656 prop = fdt_get_property(blob, config_node, prop_name, NULL); 657 658 return prop != NULL; 659 } 660 661 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 662 { 663 const char *nodep; 664 int nodeoffset; 665 int len; 666 667 debug("%s: %s\n", __func__, prop_name); 668 nodeoffset = fdt_path_offset(blob, "/config"); 669 if (nodeoffset < 0) 670 return NULL; 671 672 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 673 if (!nodep) 674 return NULL; 675 676 return (char *)nodep; 677 } 678 679 int fdtdec_decode_region(const void *blob, int node, const char *prop_name, 680 fdt_addr_t *basep, fdt_size_t *sizep) 681 { 682 const fdt_addr_t *cell; 683 int len; 684 685 debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL), 686 prop_name); 687 cell = fdt_getprop(blob, node, prop_name, &len); 688 if (!cell || (len < sizeof(fdt_addr_t) * 2)) { 689 debug("cell=%p, len=%d\n", cell, len); 690 return -1; 691 } 692 693 *basep = fdt_addr_to_cpu(*cell); 694 *sizep = fdt_size_to_cpu(cell[1]); 695 debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, 696 (ulong)*sizep); 697 698 return 0; 699 } 700 701 /** 702 * Read a flash entry from the fdt 703 * 704 * @param blob FDT blob 705 * @param node Offset of node to read 706 * @param name Name of node being read 707 * @param entry Place to put offset and size of this node 708 * @return 0 if ok, -ve on error 709 */ 710 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 711 struct fmap_entry *entry) 712 { 713 const char *prop; 714 u32 reg[2]; 715 716 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 717 debug("Node '%s' has bad/missing 'reg' property\n", name); 718 return -FDT_ERR_NOTFOUND; 719 } 720 entry->offset = reg[0]; 721 entry->length = reg[1]; 722 entry->used = fdtdec_get_int(blob, node, "used", entry->length); 723 prop = fdt_getprop(blob, node, "compress", NULL); 724 entry->compress_algo = prop && !strcmp(prop, "lzo") ? 725 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE; 726 prop = fdt_getprop(blob, node, "hash", &entry->hash_size); 727 entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE; 728 entry->hash = (uint8_t *)prop; 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 } 803 804 int fdtdec_decode_memory_region(const void *blob, int config_node, 805 const char *mem_type, const char *suffix, 806 fdt_addr_t *basep, fdt_size_t *sizep) 807 { 808 char prop_name[50]; 809 const char *mem; 810 fdt_size_t size, offset_size; 811 fdt_addr_t base, offset; 812 int node; 813 814 if (config_node == -1) { 815 config_node = fdt_path_offset(blob, "/config"); 816 if (config_node < 0) { 817 debug("%s: Cannot find /config node\n", __func__); 818 return -ENOENT; 819 } 820 } 821 if (!suffix) 822 suffix = ""; 823 824 snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, 825 suffix); 826 mem = fdt_getprop(blob, config_node, prop_name, NULL); 827 if (!mem) { 828 debug("%s: No memory type for '%s', using /memory\n", __func__, 829 prop_name); 830 mem = "/memory"; 831 } 832 833 node = fdt_path_offset(blob, mem); 834 if (node < 0) { 835 debug("%s: Failed to find node '%s': %s\n", __func__, mem, 836 fdt_strerror(node)); 837 return -ENOENT; 838 } 839 840 /* 841 * Not strictly correct - the memory may have multiple banks. We just 842 * use the first 843 */ 844 if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { 845 debug("%s: Failed to decode memory region %s\n", __func__, 846 mem); 847 return -EINVAL; 848 } 849 850 snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, 851 suffix); 852 if (fdtdec_decode_region(blob, config_node, prop_name, &offset, 853 &offset_size)) { 854 debug("%s: Failed to decode memory region '%s'\n", __func__, 855 prop_name); 856 return -EINVAL; 857 } 858 859 *basep = base + offset; 860 *sizep = offset_size; 861 862 return 0; 863 } 864 #endif 865