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(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"), 45 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 46 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 47 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 48 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 49 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 50 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"), 51 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"), 52 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"), 53 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 54 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"), 55 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 56 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), 57 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 58 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"), 59 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), 60 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"), 61 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), 62 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"), 63 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"), 64 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 65 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 66 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 67 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), 68 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"), 69 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"), 70 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"), 71 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"), 72 COMPAT(TI_TPS65090, "ti,tps65090"), 73 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"), 74 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"), 75 COMPAT(PARADE_PS8625, "parade,ps8625"), 76 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"), 77 COMPAT(INTEL_MICROCODE, "intel,microcode"), 78 COMPAT(MEMORY_SPD, "memory-spd"), 79 COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"), 80 COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"), 81 COMPAT(INTEL_GMA, "intel,gma"), 82 COMPAT(AMS_AS3722, "ams,as3722"), 83 }; 84 85 const char *fdtdec_get_compatible(enum fdt_compat_id id) 86 { 87 /* We allow reading of the 'unknown' ID for testing purposes */ 88 assert(id >= 0 && id < COMPAT_COUNT); 89 return compat_names[id]; 90 } 91 92 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 93 const char *prop_name, fdt_size_t *sizep) 94 { 95 const fdt_addr_t *cell; 96 int len; 97 98 debug("%s: %s: ", __func__, prop_name); 99 cell = fdt_getprop(blob, node, prop_name, &len); 100 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 101 len == sizeof(fdt_addr_t) * 2)) { 102 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 103 if (sizep) { 104 const fdt_size_t *size; 105 106 size = (fdt_size_t *)((char *)cell + 107 sizeof(fdt_addr_t)); 108 *sizep = fdt_size_to_cpu(*size); 109 debug("addr=%08lx, size=%08x\n", 110 (ulong)addr, *sizep); 111 } else { 112 debug("%08lx\n", (ulong)addr); 113 } 114 return addr; 115 } 116 debug("(not found)\n"); 117 return FDT_ADDR_T_NONE; 118 } 119 120 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 121 const char *prop_name) 122 { 123 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 124 } 125 126 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 127 uint64_t default_val) 128 { 129 const uint64_t *cell64; 130 int length; 131 132 cell64 = fdt_getprop(blob, node, prop_name, &length); 133 if (!cell64 || length < sizeof(*cell64)) 134 return default_val; 135 136 return fdt64_to_cpu(*cell64); 137 } 138 139 int fdtdec_get_is_enabled(const void *blob, int node) 140 { 141 const char *cell; 142 143 /* 144 * It should say "okay", so only allow that. Some fdts use "ok" but 145 * this is a bug. Please fix your device tree source file. See here 146 * for discussion: 147 * 148 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 149 */ 150 cell = fdt_getprop(blob, node, "status", NULL); 151 if (cell) 152 return 0 == strcmp(cell, "okay"); 153 return 1; 154 } 155 156 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 157 { 158 enum fdt_compat_id id; 159 160 /* Search our drivers */ 161 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 162 if (0 == fdt_node_check_compatible(blob, node, 163 compat_names[id])) 164 return id; 165 return COMPAT_UNKNOWN; 166 } 167 168 int fdtdec_next_compatible(const void *blob, int node, 169 enum fdt_compat_id id) 170 { 171 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 172 } 173 174 int fdtdec_next_compatible_subnode(const void *blob, int node, 175 enum fdt_compat_id id, int *depthp) 176 { 177 do { 178 node = fdt_next_node(blob, node, depthp); 179 } while (*depthp > 1); 180 181 /* If this is a direct subnode, and compatible, return it */ 182 if (*depthp == 1 && 0 == fdt_node_check_compatible( 183 blob, node, compat_names[id])) 184 return node; 185 186 return -FDT_ERR_NOTFOUND; 187 } 188 189 int fdtdec_next_alias(const void *blob, const char *name, 190 enum fdt_compat_id id, int *upto) 191 { 192 #define MAX_STR_LEN 20 193 char str[MAX_STR_LEN + 20]; 194 int node, err; 195 196 /* snprintf() is not available */ 197 assert(strlen(name) < MAX_STR_LEN); 198 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 199 node = fdt_path_offset(blob, str); 200 if (node < 0) 201 return node; 202 err = fdt_node_check_compatible(blob, node, compat_names[id]); 203 if (err < 0) 204 return err; 205 if (err) 206 return -FDT_ERR_NOTFOUND; 207 (*upto)++; 208 return node; 209 } 210 211 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 212 enum fdt_compat_id id, int *node_list, int maxcount) 213 { 214 memset(node_list, '\0', sizeof(*node_list) * maxcount); 215 216 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 217 } 218 219 /* TODO: Can we tighten this code up a little? */ 220 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 221 enum fdt_compat_id id, int *node_list, int maxcount) 222 { 223 int name_len = strlen(name); 224 int nodes[maxcount]; 225 int num_found = 0; 226 int offset, node; 227 int alias_node; 228 int count; 229 int i, j; 230 231 /* find the alias node if present */ 232 alias_node = fdt_path_offset(blob, "/aliases"); 233 234 /* 235 * start with nothing, and we can assume that the root node can't 236 * match 237 */ 238 memset(nodes, '\0', sizeof(nodes)); 239 240 /* First find all the compatible nodes */ 241 for (node = count = 0; node >= 0 && count < maxcount;) { 242 node = fdtdec_next_compatible(blob, node, id); 243 if (node >= 0) 244 nodes[count++] = node; 245 } 246 if (node >= 0) 247 debug("%s: warning: maxcount exceeded with alias '%s'\n", 248 __func__, name); 249 250 /* Now find all the aliases */ 251 for (offset = fdt_first_property_offset(blob, alias_node); 252 offset > 0; 253 offset = fdt_next_property_offset(blob, offset)) { 254 const struct fdt_property *prop; 255 const char *path; 256 int number; 257 int found; 258 259 node = 0; 260 prop = fdt_get_property_by_offset(blob, offset, NULL); 261 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 262 if (prop->len && 0 == strncmp(path, name, name_len)) 263 node = fdt_path_offset(blob, prop->data); 264 if (node <= 0) 265 continue; 266 267 /* Get the alias number */ 268 number = simple_strtoul(path + name_len, NULL, 10); 269 if (number < 0 || number >= maxcount) { 270 debug("%s: warning: alias '%s' is out of range\n", 271 __func__, path); 272 continue; 273 } 274 275 /* Make sure the node we found is actually in our list! */ 276 found = -1; 277 for (j = 0; j < count; j++) 278 if (nodes[j] == node) { 279 found = j; 280 break; 281 } 282 283 if (found == -1) { 284 debug("%s: warning: alias '%s' points to a node " 285 "'%s' that is missing or is not compatible " 286 " with '%s'\n", __func__, path, 287 fdt_get_name(blob, node, NULL), 288 compat_names[id]); 289 continue; 290 } 291 292 /* 293 * Add this node to our list in the right place, and mark 294 * it as done. 295 */ 296 if (fdtdec_get_is_enabled(blob, node)) { 297 if (node_list[number]) { 298 debug("%s: warning: alias '%s' requires that " 299 "a node be placed in the list in a " 300 "position which is already filled by " 301 "node '%s'\n", __func__, path, 302 fdt_get_name(blob, node, NULL)); 303 continue; 304 } 305 node_list[number] = node; 306 if (number >= num_found) 307 num_found = number + 1; 308 } 309 nodes[found] = 0; 310 } 311 312 /* Add any nodes not mentioned by an alias */ 313 for (i = j = 0; i < maxcount; i++) { 314 if (!node_list[i]) { 315 for (; j < maxcount; j++) 316 if (nodes[j] && 317 fdtdec_get_is_enabled(blob, nodes[j])) 318 break; 319 320 /* Have we run out of nodes to add? */ 321 if (j == maxcount) 322 break; 323 324 assert(!node_list[i]); 325 node_list[i] = nodes[j++]; 326 if (i >= num_found) 327 num_found = i + 1; 328 } 329 } 330 331 return num_found; 332 } 333 334 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 335 int *seqp) 336 { 337 int base_len = strlen(base); 338 const char *find_name; 339 int find_namelen; 340 int prop_offset; 341 int aliases; 342 343 find_name = fdt_get_name(blob, offset, &find_namelen); 344 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 345 346 aliases = fdt_path_offset(blob, "/aliases"); 347 for (prop_offset = fdt_first_property_offset(blob, aliases); 348 prop_offset > 0; 349 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 350 const char *prop; 351 const char *name; 352 const char *slash; 353 const char *p; 354 int len; 355 356 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 357 debug(" - %s, %s\n", name, prop); 358 if (len < find_namelen || *prop != '/' || prop[len - 1] || 359 strncmp(name, base, base_len)) 360 continue; 361 362 slash = strrchr(prop, '/'); 363 if (strcmp(slash + 1, find_name)) 364 continue; 365 for (p = name + strlen(name) - 1; p > name; p--) { 366 if (!isdigit(*p)) { 367 *seqp = simple_strtoul(p + 1, NULL, 10); 368 debug("Found seq %d\n", *seqp); 369 return 0; 370 } 371 } 372 } 373 374 debug("Not found\n"); 375 return -ENOENT; 376 } 377 378 int fdtdec_get_chosen_node(const void *blob, const char *name) 379 { 380 const char *prop; 381 int chosen_node; 382 int len; 383 384 if (!blob) 385 return -FDT_ERR_NOTFOUND; 386 chosen_node = fdt_path_offset(blob, "/chosen"); 387 prop = fdt_getprop(blob, chosen_node, name, &len); 388 if (!prop) 389 return -FDT_ERR_NOTFOUND; 390 return fdt_path_offset(blob, prop); 391 } 392 393 int fdtdec_check_fdt(void) 394 { 395 /* 396 * We must have an FDT, but we cannot panic() yet since the console 397 * is not ready. So for now, just assert(). Boards which need an early 398 * FDT (prior to console ready) will need to make their own 399 * arrangements and do their own checks. 400 */ 401 assert(!fdtdec_prepare_fdt()); 402 return 0; 403 } 404 405 /* 406 * This function is a little odd in that it accesses global data. At some 407 * point if the architecture board.c files merge this will make more sense. 408 * Even now, it is common code. 409 */ 410 int fdtdec_prepare_fdt(void) 411 { 412 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 413 fdt_check_header(gd->fdt_blob)) { 414 printf("No valid FDT found - please append one to U-Boot " 415 "binary, use u-boot-dtb.bin or define " 416 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 417 return -1; 418 } 419 return 0; 420 } 421 422 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 423 { 424 const u32 *phandle; 425 int lookup; 426 427 debug("%s: %s\n", __func__, prop_name); 428 phandle = fdt_getprop(blob, node, prop_name, NULL); 429 if (!phandle) 430 return -FDT_ERR_NOTFOUND; 431 432 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 433 return lookup; 434 } 435 436 /** 437 * Look up a property in a node and check that it has a minimum length. 438 * 439 * @param blob FDT blob 440 * @param node node to examine 441 * @param prop_name name of property to find 442 * @param min_len minimum property length in bytes 443 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 444 found, or -FDT_ERR_BADLAYOUT if not enough data 445 * @return pointer to cell, which is only valid if err == 0 446 */ 447 static const void *get_prop_check_min_len(const void *blob, int node, 448 const char *prop_name, int min_len, int *err) 449 { 450 const void *cell; 451 int len; 452 453 debug("%s: %s\n", __func__, prop_name); 454 cell = fdt_getprop(blob, node, prop_name, &len); 455 if (!cell) 456 *err = -FDT_ERR_NOTFOUND; 457 else if (len < min_len) 458 *err = -FDT_ERR_BADLAYOUT; 459 else 460 *err = 0; 461 return cell; 462 } 463 464 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 465 u32 *array, int count) 466 { 467 const u32 *cell; 468 int i, err = 0; 469 470 debug("%s: %s\n", __func__, prop_name); 471 cell = get_prop_check_min_len(blob, node, prop_name, 472 sizeof(u32) * count, &err); 473 if (!err) { 474 for (i = 0; i < count; i++) 475 array[i] = fdt32_to_cpu(cell[i]); 476 } 477 return err; 478 } 479 480 int fdtdec_get_int_array_count(const void *blob, int node, 481 const char *prop_name, u32 *array, int count) 482 { 483 const u32 *cell; 484 int len, elems; 485 int i; 486 487 debug("%s: %s\n", __func__, prop_name); 488 cell = fdt_getprop(blob, node, prop_name, &len); 489 if (!cell) 490 return -FDT_ERR_NOTFOUND; 491 elems = len / sizeof(u32); 492 if (count > elems) 493 count = elems; 494 for (i = 0; i < count; i++) 495 array[i] = fdt32_to_cpu(cell[i]); 496 497 return count; 498 } 499 500 const u32 *fdtdec_locate_array(const void *blob, int node, 501 const char *prop_name, int count) 502 { 503 const u32 *cell; 504 int err; 505 506 cell = get_prop_check_min_len(blob, node, prop_name, 507 sizeof(u32) * count, &err); 508 return err ? NULL : cell; 509 } 510 511 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 512 { 513 const s32 *cell; 514 int len; 515 516 debug("%s: %s\n", __func__, prop_name); 517 cell = fdt_getprop(blob, node, prop_name, &len); 518 return cell != NULL; 519 } 520 521 /** 522 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 523 * terminating item. 524 * 525 * @param blob FDT blob to use 526 * @param node Node to look at 527 * @param prop_name Node property name 528 * @param gpio Array of gpio elements to fill from FDT. This will be 529 * untouched if either 0 or an error is returned 530 * @param max_count Maximum number of elements allowed 531 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 532 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 533 */ 534 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 535 struct fdt_gpio_state *gpio, int max_count) 536 { 537 const struct fdt_property *prop; 538 const u32 *cell; 539 const char *name; 540 int len, i; 541 542 debug("%s: %s\n", __func__, prop_name); 543 assert(max_count > 0); 544 prop = fdt_get_property(blob, node, prop_name, &len); 545 if (!prop) { 546 debug("%s: property '%s' missing\n", __func__, prop_name); 547 return -FDT_ERR_NOTFOUND; 548 } 549 550 /* We will use the name to tag the GPIO */ 551 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 552 cell = (u32 *)prop->data; 553 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 554 if (len > max_count) { 555 debug(" %s: too many GPIOs / cells for " 556 "property '%s'\n", __func__, prop_name); 557 return -FDT_ERR_BADLAYOUT; 558 } 559 560 /* Read out the GPIO data from the cells */ 561 for (i = 0; i < len; i++, cell += 3) { 562 gpio[i].gpio = fdt32_to_cpu(cell[1]); 563 gpio[i].flags = fdt32_to_cpu(cell[2]); 564 gpio[i].name = name; 565 } 566 567 return len; 568 } 569 570 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 571 struct fdt_gpio_state *gpio) 572 { 573 int err; 574 575 debug("%s: %s\n", __func__, prop_name); 576 gpio->gpio = FDT_GPIO_NONE; 577 gpio->name = NULL; 578 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 579 return err == 1 ? 0 : err; 580 } 581 582 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 583 { 584 int val; 585 586 if (!fdt_gpio_isvalid(gpio)) 587 return -1; 588 589 val = gpio_get_value(gpio->gpio); 590 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 591 } 592 593 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 594 { 595 if (!fdt_gpio_isvalid(gpio)) 596 return -1; 597 598 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 599 return gpio_set_value(gpio->gpio, val); 600 } 601 602 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 603 { 604 /* 605 * Return success if there is no GPIO defined. This is used for 606 * optional GPIOs) 607 */ 608 if (!fdt_gpio_isvalid(gpio)) 609 return 0; 610 611 if (gpio_request(gpio->gpio, gpio->name)) 612 return -1; 613 return 0; 614 } 615 616 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 617 u8 *array, int count) 618 { 619 const u8 *cell; 620 int err; 621 622 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 623 if (!err) 624 memcpy(array, cell, count); 625 return err; 626 } 627 628 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 629 const char *prop_name, 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 return NULL; 637 return cell; 638 } 639 640 int fdtdec_get_config_int(const void *blob, const char *prop_name, 641 int default_val) 642 { 643 int config_node; 644 645 debug("%s: %s\n", __func__, prop_name); 646 config_node = fdt_path_offset(blob, "/config"); 647 if (config_node < 0) 648 return default_val; 649 return fdtdec_get_int(blob, config_node, prop_name, default_val); 650 } 651 652 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 653 { 654 int config_node; 655 const void *prop; 656 657 debug("%s: %s\n", __func__, prop_name); 658 config_node = fdt_path_offset(blob, "/config"); 659 if (config_node < 0) 660 return 0; 661 prop = fdt_get_property(blob, config_node, prop_name, NULL); 662 663 return prop != NULL; 664 } 665 666 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 667 { 668 const char *nodep; 669 int nodeoffset; 670 int len; 671 672 debug("%s: %s\n", __func__, prop_name); 673 nodeoffset = fdt_path_offset(blob, "/config"); 674 if (nodeoffset < 0) 675 return NULL; 676 677 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 678 if (!nodep) 679 return NULL; 680 681 return (char *)nodep; 682 } 683 684 int fdtdec_decode_region(const void *blob, int node, const char *prop_name, 685 fdt_addr_t *basep, fdt_size_t *sizep) 686 { 687 const fdt_addr_t *cell; 688 int len; 689 690 debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL), 691 prop_name); 692 cell = fdt_getprop(blob, node, prop_name, &len); 693 if (!cell || (len < sizeof(fdt_addr_t) * 2)) { 694 debug("cell=%p, len=%d\n", cell, len); 695 return -1; 696 } 697 698 *basep = fdt_addr_to_cpu(*cell); 699 *sizep = fdt_size_to_cpu(cell[1]); 700 debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, 701 (ulong)*sizep); 702 703 return 0; 704 } 705 706 /** 707 * Read a flash entry from the fdt 708 * 709 * @param blob FDT blob 710 * @param node Offset of node to read 711 * @param name Name of node being read 712 * @param entry Place to put offset and size of this node 713 * @return 0 if ok, -ve on error 714 */ 715 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 716 struct fmap_entry *entry) 717 { 718 const char *prop; 719 u32 reg[2]; 720 721 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 722 debug("Node '%s' has bad/missing 'reg' property\n", name); 723 return -FDT_ERR_NOTFOUND; 724 } 725 entry->offset = reg[0]; 726 entry->length = reg[1]; 727 entry->used = fdtdec_get_int(blob, node, "used", entry->length); 728 prop = fdt_getprop(blob, node, "compress", NULL); 729 entry->compress_algo = prop && !strcmp(prop, "lzo") ? 730 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE; 731 prop = fdt_getprop(blob, node, "hash", &entry->hash_size); 732 entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE; 733 entry->hash = (uint8_t *)prop; 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 } 808 809 int fdtdec_decode_memory_region(const void *blob, int config_node, 810 const char *mem_type, const char *suffix, 811 fdt_addr_t *basep, fdt_size_t *sizep) 812 { 813 char prop_name[50]; 814 const char *mem; 815 fdt_size_t size, offset_size; 816 fdt_addr_t base, offset; 817 int node; 818 819 if (config_node == -1) { 820 config_node = fdt_path_offset(blob, "/config"); 821 if (config_node < 0) { 822 debug("%s: Cannot find /config node\n", __func__); 823 return -ENOENT; 824 } 825 } 826 if (!suffix) 827 suffix = ""; 828 829 snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, 830 suffix); 831 mem = fdt_getprop(blob, config_node, prop_name, NULL); 832 if (!mem) { 833 debug("%s: No memory type for '%s', using /memory\n", __func__, 834 prop_name); 835 mem = "/memory"; 836 } 837 838 node = fdt_path_offset(blob, mem); 839 if (node < 0) { 840 debug("%s: Failed to find node '%s': %s\n", __func__, mem, 841 fdt_strerror(node)); 842 return -ENOENT; 843 } 844 845 /* 846 * Not strictly correct - the memory may have multiple banks. We just 847 * use the first 848 */ 849 if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { 850 debug("%s: Failed to decode memory region %s\n", __func__, 851 mem); 852 return -EINVAL; 853 } 854 855 snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, 856 suffix); 857 if (fdtdec_decode_region(blob, config_node, prop_name, &offset, 858 &offset_size)) { 859 debug("%s: Failed to decode memory region '%s'\n", __func__, 860 prop_name); 861 return -EINVAL; 862 } 863 864 *basep = base + offset; 865 *sizep = offset_size; 866 867 return 0; 868 } 869 #endif 870