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_PCIE, "nvidia,tegra124-pcie"), 45 COMPAT(NVIDIA_TEGRA30_PCIE, "nvidia,tegra30-pcie"), 46 COMPAT(NVIDIA_TEGRA20_PCIE, "nvidia,tegra20-pcie"), 47 COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"), 48 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 49 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 50 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 51 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 52 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 53 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"), 54 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"), 55 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"), 56 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 57 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"), 58 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 59 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), 60 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 61 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"), 62 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), 63 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"), 64 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), 65 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"), 66 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"), 67 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 68 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 69 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 70 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), 71 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"), 72 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"), 73 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"), 74 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"), 75 COMPAT(TI_TPS65090, "ti,tps65090"), 76 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"), 77 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"), 78 COMPAT(PARADE_PS8625, "parade,ps8625"), 79 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"), 80 COMPAT(INTEL_MICROCODE, "intel,microcode"), 81 COMPAT(MEMORY_SPD, "memory-spd"), 82 COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"), 83 COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"), 84 COMPAT(INTEL_GMA, "intel,gma"), 85 COMPAT(AMS_AS3722, "ams,as3722"), 86 }; 87 88 const char *fdtdec_get_compatible(enum fdt_compat_id id) 89 { 90 /* We allow reading of the 'unknown' ID for testing purposes */ 91 assert(id >= 0 && id < COMPAT_COUNT); 92 return compat_names[id]; 93 } 94 95 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 96 const char *prop_name, fdt_size_t *sizep) 97 { 98 const fdt_addr_t *cell; 99 int len; 100 101 debug("%s: %s: ", __func__, prop_name); 102 cell = fdt_getprop(blob, node, prop_name, &len); 103 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 104 len == sizeof(fdt_addr_t) * 2)) { 105 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 106 if (sizep) { 107 const fdt_size_t *size; 108 109 size = (fdt_size_t *)((char *)cell + 110 sizeof(fdt_addr_t)); 111 *sizep = fdt_size_to_cpu(*size); 112 debug("addr=%08lx, size=%08x\n", 113 (ulong)addr, *sizep); 114 } else { 115 debug("%08lx\n", (ulong)addr); 116 } 117 return addr; 118 } 119 debug("(not found)\n"); 120 return FDT_ADDR_T_NONE; 121 } 122 123 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 124 const char *prop_name) 125 { 126 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 127 } 128 129 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 130 uint64_t default_val) 131 { 132 const uint64_t *cell64; 133 int length; 134 135 cell64 = fdt_getprop(blob, node, prop_name, &length); 136 if (!cell64 || length < sizeof(*cell64)) 137 return default_val; 138 139 return fdt64_to_cpu(*cell64); 140 } 141 142 int fdtdec_get_is_enabled(const void *blob, int node) 143 { 144 const char *cell; 145 146 /* 147 * It should say "okay", so only allow that. Some fdts use "ok" but 148 * this is a bug. Please fix your device tree source file. See here 149 * for discussion: 150 * 151 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 152 */ 153 cell = fdt_getprop(blob, node, "status", NULL); 154 if (cell) 155 return 0 == strcmp(cell, "okay"); 156 return 1; 157 } 158 159 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 160 { 161 enum fdt_compat_id id; 162 163 /* Search our drivers */ 164 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 165 if (0 == fdt_node_check_compatible(blob, node, 166 compat_names[id])) 167 return id; 168 return COMPAT_UNKNOWN; 169 } 170 171 int fdtdec_next_compatible(const void *blob, int node, 172 enum fdt_compat_id id) 173 { 174 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 175 } 176 177 int fdtdec_next_compatible_subnode(const void *blob, int node, 178 enum fdt_compat_id id, int *depthp) 179 { 180 do { 181 node = fdt_next_node(blob, node, depthp); 182 } while (*depthp > 1); 183 184 /* If this is a direct subnode, and compatible, return it */ 185 if (*depthp == 1 && 0 == fdt_node_check_compatible( 186 blob, node, compat_names[id])) 187 return node; 188 189 return -FDT_ERR_NOTFOUND; 190 } 191 192 int fdtdec_next_alias(const void *blob, const char *name, 193 enum fdt_compat_id id, int *upto) 194 { 195 #define MAX_STR_LEN 20 196 char str[MAX_STR_LEN + 20]; 197 int node, err; 198 199 /* snprintf() is not available */ 200 assert(strlen(name) < MAX_STR_LEN); 201 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 202 node = fdt_path_offset(blob, str); 203 if (node < 0) 204 return node; 205 err = fdt_node_check_compatible(blob, node, compat_names[id]); 206 if (err < 0) 207 return err; 208 if (err) 209 return -FDT_ERR_NOTFOUND; 210 (*upto)++; 211 return node; 212 } 213 214 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 215 enum fdt_compat_id id, int *node_list, int maxcount) 216 { 217 memset(node_list, '\0', sizeof(*node_list) * maxcount); 218 219 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 220 } 221 222 /* TODO: Can we tighten this code up a little? */ 223 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 224 enum fdt_compat_id id, int *node_list, int maxcount) 225 { 226 int name_len = strlen(name); 227 int nodes[maxcount]; 228 int num_found = 0; 229 int offset, node; 230 int alias_node; 231 int count; 232 int i, j; 233 234 /* find the alias node if present */ 235 alias_node = fdt_path_offset(blob, "/aliases"); 236 237 /* 238 * start with nothing, and we can assume that the root node can't 239 * match 240 */ 241 memset(nodes, '\0', sizeof(nodes)); 242 243 /* First find all the compatible nodes */ 244 for (node = count = 0; node >= 0 && count < maxcount;) { 245 node = fdtdec_next_compatible(blob, node, id); 246 if (node >= 0) 247 nodes[count++] = node; 248 } 249 if (node >= 0) 250 debug("%s: warning: maxcount exceeded with alias '%s'\n", 251 __func__, name); 252 253 /* Now find all the aliases */ 254 for (offset = fdt_first_property_offset(blob, alias_node); 255 offset > 0; 256 offset = fdt_next_property_offset(blob, offset)) { 257 const struct fdt_property *prop; 258 const char *path; 259 int number; 260 int found; 261 262 node = 0; 263 prop = fdt_get_property_by_offset(blob, offset, NULL); 264 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 265 if (prop->len && 0 == strncmp(path, name, name_len)) 266 node = fdt_path_offset(blob, prop->data); 267 if (node <= 0) 268 continue; 269 270 /* Get the alias number */ 271 number = simple_strtoul(path + name_len, NULL, 10); 272 if (number < 0 || number >= maxcount) { 273 debug("%s: warning: alias '%s' is out of range\n", 274 __func__, path); 275 continue; 276 } 277 278 /* Make sure the node we found is actually in our list! */ 279 found = -1; 280 for (j = 0; j < count; j++) 281 if (nodes[j] == node) { 282 found = j; 283 break; 284 } 285 286 if (found == -1) { 287 debug("%s: warning: alias '%s' points to a node " 288 "'%s' that is missing or is not compatible " 289 " with '%s'\n", __func__, path, 290 fdt_get_name(blob, node, NULL), 291 compat_names[id]); 292 continue; 293 } 294 295 /* 296 * Add this node to our list in the right place, and mark 297 * it as done. 298 */ 299 if (fdtdec_get_is_enabled(blob, node)) { 300 if (node_list[number]) { 301 debug("%s: warning: alias '%s' requires that " 302 "a node be placed in the list in a " 303 "position which is already filled by " 304 "node '%s'\n", __func__, path, 305 fdt_get_name(blob, node, NULL)); 306 continue; 307 } 308 node_list[number] = node; 309 if (number >= num_found) 310 num_found = number + 1; 311 } 312 nodes[found] = 0; 313 } 314 315 /* Add any nodes not mentioned by an alias */ 316 for (i = j = 0; i < maxcount; i++) { 317 if (!node_list[i]) { 318 for (; j < maxcount; j++) 319 if (nodes[j] && 320 fdtdec_get_is_enabled(blob, nodes[j])) 321 break; 322 323 /* Have we run out of nodes to add? */ 324 if (j == maxcount) 325 break; 326 327 assert(!node_list[i]); 328 node_list[i] = nodes[j++]; 329 if (i >= num_found) 330 num_found = i + 1; 331 } 332 } 333 334 return num_found; 335 } 336 337 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 338 int *seqp) 339 { 340 int base_len = strlen(base); 341 const char *find_name; 342 int find_namelen; 343 int prop_offset; 344 int aliases; 345 346 find_name = fdt_get_name(blob, offset, &find_namelen); 347 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 348 349 aliases = fdt_path_offset(blob, "/aliases"); 350 for (prop_offset = fdt_first_property_offset(blob, aliases); 351 prop_offset > 0; 352 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 353 const char *prop; 354 const char *name; 355 const char *slash; 356 const char *p; 357 int len; 358 359 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 360 debug(" - %s, %s\n", name, prop); 361 if (len < find_namelen || *prop != '/' || prop[len - 1] || 362 strncmp(name, base, base_len)) 363 continue; 364 365 slash = strrchr(prop, '/'); 366 if (strcmp(slash + 1, find_name)) 367 continue; 368 for (p = name + strlen(name) - 1; p > name; p--) { 369 if (!isdigit(*p)) { 370 *seqp = simple_strtoul(p + 1, NULL, 10); 371 debug("Found seq %d\n", *seqp); 372 return 0; 373 } 374 } 375 } 376 377 debug("Not found\n"); 378 return -ENOENT; 379 } 380 381 int fdtdec_get_chosen_node(const void *blob, const char *name) 382 { 383 const char *prop; 384 int chosen_node; 385 int len; 386 387 if (!blob) 388 return -FDT_ERR_NOTFOUND; 389 chosen_node = fdt_path_offset(blob, "/chosen"); 390 prop = fdt_getprop(blob, chosen_node, name, &len); 391 if (!prop) 392 return -FDT_ERR_NOTFOUND; 393 return fdt_path_offset(blob, prop); 394 } 395 396 int fdtdec_check_fdt(void) 397 { 398 /* 399 * We must have an FDT, but we cannot panic() yet since the console 400 * is not ready. So for now, just assert(). Boards which need an early 401 * FDT (prior to console ready) will need to make their own 402 * arrangements and do their own checks. 403 */ 404 assert(!fdtdec_prepare_fdt()); 405 return 0; 406 } 407 408 /* 409 * This function is a little odd in that it accesses global data. At some 410 * point if the architecture board.c files merge this will make more sense. 411 * Even now, it is common code. 412 */ 413 int fdtdec_prepare_fdt(void) 414 { 415 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 416 fdt_check_header(gd->fdt_blob)) { 417 printf("No valid FDT found - please append one to U-Boot " 418 "binary, use u-boot-dtb.bin or define " 419 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 420 return -1; 421 } 422 return 0; 423 } 424 425 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 426 { 427 const u32 *phandle; 428 int lookup; 429 430 debug("%s: %s\n", __func__, prop_name); 431 phandle = fdt_getprop(blob, node, prop_name, NULL); 432 if (!phandle) 433 return -FDT_ERR_NOTFOUND; 434 435 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 436 return lookup; 437 } 438 439 /** 440 * Look up a property in a node and check that it has a minimum length. 441 * 442 * @param blob FDT blob 443 * @param node node to examine 444 * @param prop_name name of property to find 445 * @param min_len minimum property length in bytes 446 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 447 found, or -FDT_ERR_BADLAYOUT if not enough data 448 * @return pointer to cell, which is only valid if err == 0 449 */ 450 static const void *get_prop_check_min_len(const void *blob, int node, 451 const char *prop_name, int min_len, int *err) 452 { 453 const void *cell; 454 int len; 455 456 debug("%s: %s\n", __func__, prop_name); 457 cell = fdt_getprop(blob, node, prop_name, &len); 458 if (!cell) 459 *err = -FDT_ERR_NOTFOUND; 460 else if (len < min_len) 461 *err = -FDT_ERR_BADLAYOUT; 462 else 463 *err = 0; 464 return cell; 465 } 466 467 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 468 u32 *array, int count) 469 { 470 const u32 *cell; 471 int i, err = 0; 472 473 debug("%s: %s\n", __func__, prop_name); 474 cell = get_prop_check_min_len(blob, node, prop_name, 475 sizeof(u32) * count, &err); 476 if (!err) { 477 for (i = 0; i < count; i++) 478 array[i] = fdt32_to_cpu(cell[i]); 479 } 480 return err; 481 } 482 483 int fdtdec_get_int_array_count(const void *blob, int node, 484 const char *prop_name, u32 *array, int count) 485 { 486 const u32 *cell; 487 int len, elems; 488 int i; 489 490 debug("%s: %s\n", __func__, prop_name); 491 cell = fdt_getprop(blob, node, prop_name, &len); 492 if (!cell) 493 return -FDT_ERR_NOTFOUND; 494 elems = len / sizeof(u32); 495 if (count > elems) 496 count = elems; 497 for (i = 0; i < count; i++) 498 array[i] = fdt32_to_cpu(cell[i]); 499 500 return count; 501 } 502 503 const u32 *fdtdec_locate_array(const void *blob, int node, 504 const char *prop_name, int count) 505 { 506 const u32 *cell; 507 int err; 508 509 cell = get_prop_check_min_len(blob, node, prop_name, 510 sizeof(u32) * count, &err); 511 return err ? NULL : cell; 512 } 513 514 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 515 { 516 const s32 *cell; 517 int len; 518 519 debug("%s: %s\n", __func__, prop_name); 520 cell = fdt_getprop(blob, node, prop_name, &len); 521 return cell != NULL; 522 } 523 524 /** 525 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 526 * terminating item. 527 * 528 * @param blob FDT blob to use 529 * @param node Node to look at 530 * @param prop_name Node property name 531 * @param gpio Array of gpio elements to fill from FDT. This will be 532 * untouched if either 0 or an error is returned 533 * @param max_count Maximum number of elements allowed 534 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 535 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 536 */ 537 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 538 struct fdt_gpio_state *gpio, int max_count) 539 { 540 const struct fdt_property *prop; 541 const u32 *cell; 542 const char *name; 543 int len, i; 544 545 debug("%s: %s\n", __func__, prop_name); 546 assert(max_count > 0); 547 prop = fdt_get_property(blob, node, prop_name, &len); 548 if (!prop) { 549 debug("%s: property '%s' missing\n", __func__, prop_name); 550 return -FDT_ERR_NOTFOUND; 551 } 552 553 /* We will use the name to tag the GPIO */ 554 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 555 cell = (u32 *)prop->data; 556 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 557 if (len > max_count) { 558 debug(" %s: too many GPIOs / cells for " 559 "property '%s'\n", __func__, prop_name); 560 return -FDT_ERR_BADLAYOUT; 561 } 562 563 /* Read out the GPIO data from the cells */ 564 for (i = 0; i < len; i++, cell += 3) { 565 gpio[i].gpio = fdt32_to_cpu(cell[1]); 566 gpio[i].flags = fdt32_to_cpu(cell[2]); 567 gpio[i].name = name; 568 } 569 570 return len; 571 } 572 573 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 574 struct fdt_gpio_state *gpio) 575 { 576 int err; 577 578 debug("%s: %s\n", __func__, prop_name); 579 gpio->gpio = FDT_GPIO_NONE; 580 gpio->name = NULL; 581 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 582 return err == 1 ? 0 : err; 583 } 584 585 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 586 { 587 int val; 588 589 if (!fdt_gpio_isvalid(gpio)) 590 return -1; 591 592 val = gpio_get_value(gpio->gpio); 593 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 594 } 595 596 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 597 { 598 if (!fdt_gpio_isvalid(gpio)) 599 return -1; 600 601 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 602 return gpio_set_value(gpio->gpio, val); 603 } 604 605 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 606 { 607 /* 608 * Return success if there is no GPIO defined. This is used for 609 * optional GPIOs) 610 */ 611 if (!fdt_gpio_isvalid(gpio)) 612 return 0; 613 614 if (gpio_request(gpio->gpio, gpio->name)) 615 return -1; 616 return 0; 617 } 618 619 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 620 u8 *array, int count) 621 { 622 const u8 *cell; 623 int err; 624 625 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 626 if (!err) 627 memcpy(array, cell, count); 628 return err; 629 } 630 631 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 632 const char *prop_name, int count) 633 { 634 const u8 *cell; 635 int err; 636 637 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 638 if (err) 639 return NULL; 640 return cell; 641 } 642 643 int fdtdec_get_config_int(const void *blob, const char *prop_name, 644 int default_val) 645 { 646 int config_node; 647 648 debug("%s: %s\n", __func__, prop_name); 649 config_node = fdt_path_offset(blob, "/config"); 650 if (config_node < 0) 651 return default_val; 652 return fdtdec_get_int(blob, config_node, prop_name, default_val); 653 } 654 655 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 656 { 657 int config_node; 658 const void *prop; 659 660 debug("%s: %s\n", __func__, prop_name); 661 config_node = fdt_path_offset(blob, "/config"); 662 if (config_node < 0) 663 return 0; 664 prop = fdt_get_property(blob, config_node, prop_name, NULL); 665 666 return prop != NULL; 667 } 668 669 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 670 { 671 const char *nodep; 672 int nodeoffset; 673 int len; 674 675 debug("%s: %s\n", __func__, prop_name); 676 nodeoffset = fdt_path_offset(blob, "/config"); 677 if (nodeoffset < 0) 678 return NULL; 679 680 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 681 if (!nodep) 682 return NULL; 683 684 return (char *)nodep; 685 } 686 687 int fdtdec_decode_region(const void *blob, int node, const char *prop_name, 688 fdt_addr_t *basep, fdt_size_t *sizep) 689 { 690 const fdt_addr_t *cell; 691 int len; 692 693 debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL), 694 prop_name); 695 cell = fdt_getprop(blob, node, prop_name, &len); 696 if (!cell || (len < sizeof(fdt_addr_t) * 2)) { 697 debug("cell=%p, len=%d\n", cell, len); 698 return -1; 699 } 700 701 *basep = fdt_addr_to_cpu(*cell); 702 *sizep = fdt_size_to_cpu(cell[1]); 703 debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, 704 (ulong)*sizep); 705 706 return 0; 707 } 708 709 /** 710 * Read a flash entry from the fdt 711 * 712 * @param blob FDT blob 713 * @param node Offset of node to read 714 * @param name Name of node being read 715 * @param entry Place to put offset and size of this node 716 * @return 0 if ok, -ve on error 717 */ 718 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 719 struct fmap_entry *entry) 720 { 721 const char *prop; 722 u32 reg[2]; 723 724 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 725 debug("Node '%s' has bad/missing 'reg' property\n", name); 726 return -FDT_ERR_NOTFOUND; 727 } 728 entry->offset = reg[0]; 729 entry->length = reg[1]; 730 entry->used = fdtdec_get_int(blob, node, "used", entry->length); 731 prop = fdt_getprop(blob, node, "compress", NULL); 732 entry->compress_algo = prop && !strcmp(prop, "lzo") ? 733 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE; 734 prop = fdt_getprop(blob, node, "hash", &entry->hash_size); 735 entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE; 736 entry->hash = (uint8_t *)prop; 737 738 return 0; 739 } 740 741 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 742 { 743 u64 number = 0; 744 745 while (cells--) 746 number = (number << 32) | fdt32_to_cpu(*ptr++); 747 748 return number; 749 } 750 751 int fdt_get_resource(const void *fdt, int node, const char *property, 752 unsigned int index, struct fdt_resource *res) 753 { 754 const fdt32_t *ptr, *end; 755 int na, ns, len, parent; 756 unsigned int i = 0; 757 758 parent = fdt_parent_offset(fdt, node); 759 if (parent < 0) 760 return parent; 761 762 na = fdt_address_cells(fdt, parent); 763 ns = fdt_size_cells(fdt, parent); 764 765 ptr = fdt_getprop(fdt, node, property, &len); 766 if (!ptr) 767 return len; 768 769 end = ptr + len / sizeof(*ptr); 770 771 while (ptr + na + ns <= end) { 772 if (i == index) { 773 res->start = res->end = fdtdec_get_number(ptr, na); 774 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 775 return 0; 776 } 777 778 ptr += na + ns; 779 i++; 780 } 781 782 return -FDT_ERR_NOTFOUND; 783 } 784 785 int fdt_get_named_resource(const void *fdt, int node, const char *property, 786 const char *prop_names, const char *name, 787 struct fdt_resource *res) 788 { 789 int index; 790 791 index = fdt_find_string(fdt, node, prop_names, name); 792 if (index < 0) 793 return index; 794 795 return fdt_get_resource(fdt, node, property, index, res); 796 } 797 798 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) 799 { 800 const fdt32_t *prop; 801 int len; 802 803 prop = fdt_getprop(fdt, node, "reg", &len); 804 if (!prop) 805 return len; 806 807 *bdf = fdt32_to_cpu(*prop) & 0xffffff; 808 809 return 0; 810 } 811 812 int fdtdec_decode_memory_region(const void *blob, int config_node, 813 const char *mem_type, const char *suffix, 814 fdt_addr_t *basep, fdt_size_t *sizep) 815 { 816 char prop_name[50]; 817 const char *mem; 818 fdt_size_t size, offset_size; 819 fdt_addr_t base, offset; 820 int node; 821 822 if (config_node == -1) { 823 config_node = fdt_path_offset(blob, "/config"); 824 if (config_node < 0) { 825 debug("%s: Cannot find /config node\n", __func__); 826 return -ENOENT; 827 } 828 } 829 if (!suffix) 830 suffix = ""; 831 832 snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, 833 suffix); 834 mem = fdt_getprop(blob, config_node, prop_name, NULL); 835 if (!mem) { 836 debug("%s: No memory type for '%s', using /memory\n", __func__, 837 prop_name); 838 mem = "/memory"; 839 } 840 841 node = fdt_path_offset(blob, mem); 842 if (node < 0) { 843 debug("%s: Failed to find node '%s': %s\n", __func__, mem, 844 fdt_strerror(node)); 845 return -ENOENT; 846 } 847 848 /* 849 * Not strictly correct - the memory may have multiple banks. We just 850 * use the first 851 */ 852 if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { 853 debug("%s: Failed to decode memory region %s\n", __func__, 854 mem); 855 return -EINVAL; 856 } 857 858 snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, 859 suffix); 860 if (fdtdec_decode_region(blob, config_node, prop_name, &offset, 861 &offset_size)) { 862 debug("%s: Failed to decode memory region '%s'\n", __func__, 863 prop_name); 864 return -EINVAL; 865 } 866 867 *basep = base + offset; 868 *sizep = offset_size; 869 870 return 0; 871 } 872 #endif 873