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 DECLARE_GLOBAL_DATA_PTR; 15 16 /* 17 * Here are the type we know about. One day we might allow drivers to 18 * register. For now we just put them here. The COMPAT macro allows us to 19 * turn this into a sparse list later, and keeps the ID with the name. 20 */ 21 #define COMPAT(id, name) name 22 static const char * const compat_names[COMPAT_COUNT] = { 23 COMPAT(UNKNOWN, "<none>"), 24 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), 25 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"), 26 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"), 27 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), 28 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), 29 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), 30 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), 31 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), 32 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), 33 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"), 34 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"), 35 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"), 36 COMPAT(NVIDIA_TEGRA124_PCIE, "nvidia,tegra124-pcie"), 37 COMPAT(NVIDIA_TEGRA30_PCIE, "nvidia,tegra30-pcie"), 38 COMPAT(NVIDIA_TEGRA20_PCIE, "nvidia,tegra20-pcie"), 39 COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"), 40 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 41 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 42 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 43 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 44 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 45 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"), 46 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"), 47 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 48 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"), 49 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 50 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), 51 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 52 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"), 53 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), 54 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"), 55 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), 56 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"), 57 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"), 58 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 59 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 60 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 61 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), 62 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"), 63 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"), 64 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"), 65 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"), 66 COMPAT(TI_TPS65090, "ti,tps65090"), 67 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"), 68 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"), 69 COMPAT(PARADE_PS8625, "parade,ps8625"), 70 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"), 71 COMPAT(INTEL_MICROCODE, "intel,microcode"), 72 COMPAT(MEMORY_SPD, "memory-spd"), 73 COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"), 74 COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"), 75 COMPAT(INTEL_GMA, "intel,gma"), 76 COMPAT(AMS_AS3722, "ams,as3722"), 77 COMPAT(INTEL_ICH_SPI, "intel,ich-spi"), 78 COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"), 79 }; 80 81 const char *fdtdec_get_compatible(enum fdt_compat_id id) 82 { 83 /* We allow reading of the 'unknown' ID for testing purposes */ 84 assert(id >= 0 && id < COMPAT_COUNT); 85 return compat_names[id]; 86 } 87 88 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 89 const char *prop_name, fdt_size_t *sizep) 90 { 91 const fdt_addr_t *cell; 92 int len; 93 94 debug("%s: %s: ", __func__, prop_name); 95 cell = fdt_getprop(blob, node, prop_name, &len); 96 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 97 len == sizeof(fdt_addr_t) * 2)) { 98 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 99 if (sizep) { 100 const fdt_size_t *size; 101 102 size = (fdt_size_t *)((char *)cell + 103 sizeof(fdt_addr_t)); 104 *sizep = fdt_size_to_cpu(*size); 105 debug("addr=%08lx, size=%08x\n", 106 (ulong)addr, *sizep); 107 } else { 108 debug("%08lx\n", (ulong)addr); 109 } 110 return addr; 111 } 112 debug("(not found)\n"); 113 return FDT_ADDR_T_NONE; 114 } 115 116 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 117 const char *prop_name) 118 { 119 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 120 } 121 122 #ifdef CONFIG_PCI 123 int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type, 124 const char *prop_name, struct fdt_pci_addr *addr) 125 { 126 const u32 *cell; 127 int len; 128 int ret = -ENOENT; 129 130 debug("%s: %s: ", __func__, prop_name); 131 132 /* 133 * If we follow the pci bus bindings strictly, we should check 134 * the value of the node's parent node's #address-cells and 135 * #size-cells. They need to be 3 and 2 accordingly. However, 136 * for simplicity we skip the check here. 137 */ 138 cell = fdt_getprop(blob, node, prop_name, &len); 139 if (!cell) 140 goto fail; 141 142 if ((len % FDT_PCI_REG_SIZE) == 0) { 143 int num = len / FDT_PCI_REG_SIZE; 144 int i; 145 146 for (i = 0; i < num; i++) { 147 debug("pci address #%d: %08lx %08lx %08lx\n", i, 148 (ulong)fdt_addr_to_cpu(cell[0]), 149 (ulong)fdt_addr_to_cpu(cell[1]), 150 (ulong)fdt_addr_to_cpu(cell[2])); 151 if ((fdt_addr_to_cpu(*cell) & type) == type) { 152 addr->phys_hi = fdt_addr_to_cpu(cell[0]); 153 addr->phys_mid = fdt_addr_to_cpu(cell[1]); 154 addr->phys_lo = fdt_addr_to_cpu(cell[2]); 155 break; 156 } else { 157 cell += (FDT_PCI_ADDR_CELLS + 158 FDT_PCI_SIZE_CELLS); 159 } 160 } 161 162 if (i == num) 163 goto fail; 164 165 return 0; 166 } else { 167 ret = -EINVAL; 168 } 169 170 fail: 171 debug("(not found)\n"); 172 return ret; 173 } 174 175 int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device) 176 { 177 const char *list, *end; 178 int len; 179 180 list = fdt_getprop(blob, node, "compatible", &len); 181 if (!list) 182 return -ENOENT; 183 184 end = list + len; 185 while (list < end) { 186 char *s; 187 188 len = strlen(list); 189 if (len >= strlen("pciVVVV,DDDD")) { 190 s = strstr(list, "pci"); 191 192 /* 193 * check if the string is something like pciVVVV,DDDD.RR 194 * or just pciVVVV,DDDD 195 */ 196 if (s && s[7] == ',' && 197 (s[12] == '.' || s[12] == 0)) { 198 s += 3; 199 *vendor = simple_strtol(s, NULL, 16); 200 201 s += 5; 202 *device = simple_strtol(s, NULL, 16); 203 204 return 0; 205 } 206 } else { 207 list += (len + 1); 208 } 209 } 210 211 return -ENOENT; 212 } 213 214 int fdtdec_get_pci_bdf(const void *blob, int node, 215 struct fdt_pci_addr *addr, pci_dev_t *bdf) 216 { 217 u16 dt_vendor, dt_device, vendor, device; 218 int ret; 219 220 /* get vendor id & device id from the compatible string */ 221 ret = fdtdec_get_pci_vendev(blob, node, &dt_vendor, &dt_device); 222 if (ret) 223 return ret; 224 225 /* extract the bdf from fdt_pci_addr */ 226 *bdf = addr->phys_hi & 0xffff00; 227 228 /* read vendor id & device id based on bdf */ 229 pci_read_config_word(*bdf, PCI_VENDOR_ID, &vendor); 230 pci_read_config_word(*bdf, PCI_DEVICE_ID, &device); 231 232 /* 233 * Note there are two places in the device tree to fully describe 234 * a pci device: one is via compatible string with a format of 235 * "pciVVVV,DDDD" and the other one is the bdf numbers encoded in 236 * the device node's reg address property. We read the vendor id 237 * and device id based on bdf and compare the values with the 238 * "VVVV,DDDD". If they are the same, then we are good to use bdf 239 * to read device's bar. But if they are different, we have to rely 240 * on the vendor id and device id extracted from the compatible 241 * string and locate the real bdf by pci_find_device(). This is 242 * because normally we may only know device's device number and 243 * function number when writing device tree. The bus number is 244 * dynamically assigned during the pci enumeration process. 245 */ 246 if ((dt_vendor != vendor) || (dt_device != device)) { 247 *bdf = pci_find_device(dt_vendor, dt_device, 0); 248 if (*bdf == -1) 249 return -ENODEV; 250 } 251 252 return 0; 253 } 254 255 int fdtdec_get_pci_bar32(const void *blob, int node, 256 struct fdt_pci_addr *addr, u32 *bar) 257 { 258 pci_dev_t bdf; 259 int barnum; 260 int ret; 261 262 /* get pci devices's bdf */ 263 ret = fdtdec_get_pci_bdf(blob, node, addr, &bdf); 264 if (ret) 265 return ret; 266 267 /* extract the bar number from fdt_pci_addr */ 268 barnum = addr->phys_hi & 0xff; 269 if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS)) 270 return -EINVAL; 271 272 barnum = (barnum - PCI_BASE_ADDRESS_0) / 4; 273 *bar = pci_read_bar32(pci_bus_to_hose(PCI_BUS(bdf)), bdf, barnum); 274 275 return 0; 276 } 277 #endif 278 279 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 280 uint64_t default_val) 281 { 282 const uint64_t *cell64; 283 int length; 284 285 cell64 = fdt_getprop(blob, node, prop_name, &length); 286 if (!cell64 || length < sizeof(*cell64)) 287 return default_val; 288 289 return fdt64_to_cpu(*cell64); 290 } 291 292 int fdtdec_get_is_enabled(const void *blob, int node) 293 { 294 const char *cell; 295 296 /* 297 * It should say "okay", so only allow that. Some fdts use "ok" but 298 * this is a bug. Please fix your device tree source file. See here 299 * for discussion: 300 * 301 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 302 */ 303 cell = fdt_getprop(blob, node, "status", NULL); 304 if (cell) 305 return 0 == strcmp(cell, "okay"); 306 return 1; 307 } 308 309 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 310 { 311 enum fdt_compat_id id; 312 313 /* Search our drivers */ 314 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 315 if (0 == fdt_node_check_compatible(blob, node, 316 compat_names[id])) 317 return id; 318 return COMPAT_UNKNOWN; 319 } 320 321 int fdtdec_next_compatible(const void *blob, int node, 322 enum fdt_compat_id id) 323 { 324 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 325 } 326 327 int fdtdec_next_compatible_subnode(const void *blob, int node, 328 enum fdt_compat_id id, int *depthp) 329 { 330 do { 331 node = fdt_next_node(blob, node, depthp); 332 } while (*depthp > 1); 333 334 /* If this is a direct subnode, and compatible, return it */ 335 if (*depthp == 1 && 0 == fdt_node_check_compatible( 336 blob, node, compat_names[id])) 337 return node; 338 339 return -FDT_ERR_NOTFOUND; 340 } 341 342 int fdtdec_next_alias(const void *blob, const char *name, 343 enum fdt_compat_id id, int *upto) 344 { 345 #define MAX_STR_LEN 20 346 char str[MAX_STR_LEN + 20]; 347 int node, err; 348 349 /* snprintf() is not available */ 350 assert(strlen(name) < MAX_STR_LEN); 351 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 352 node = fdt_path_offset(blob, str); 353 if (node < 0) 354 return node; 355 err = fdt_node_check_compatible(blob, node, compat_names[id]); 356 if (err < 0) 357 return err; 358 if (err) 359 return -FDT_ERR_NOTFOUND; 360 (*upto)++; 361 return node; 362 } 363 364 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 365 enum fdt_compat_id id, int *node_list, int maxcount) 366 { 367 memset(node_list, '\0', sizeof(*node_list) * maxcount); 368 369 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 370 } 371 372 /* TODO: Can we tighten this code up a little? */ 373 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 374 enum fdt_compat_id id, int *node_list, int maxcount) 375 { 376 int name_len = strlen(name); 377 int nodes[maxcount]; 378 int num_found = 0; 379 int offset, node; 380 int alias_node; 381 int count; 382 int i, j; 383 384 /* find the alias node if present */ 385 alias_node = fdt_path_offset(blob, "/aliases"); 386 387 /* 388 * start with nothing, and we can assume that the root node can't 389 * match 390 */ 391 memset(nodes, '\0', sizeof(nodes)); 392 393 /* First find all the compatible nodes */ 394 for (node = count = 0; node >= 0 && count < maxcount;) { 395 node = fdtdec_next_compatible(blob, node, id); 396 if (node >= 0) 397 nodes[count++] = node; 398 } 399 if (node >= 0) 400 debug("%s: warning: maxcount exceeded with alias '%s'\n", 401 __func__, name); 402 403 /* Now find all the aliases */ 404 for (offset = fdt_first_property_offset(blob, alias_node); 405 offset > 0; 406 offset = fdt_next_property_offset(blob, offset)) { 407 const struct fdt_property *prop; 408 const char *path; 409 int number; 410 int found; 411 412 node = 0; 413 prop = fdt_get_property_by_offset(blob, offset, NULL); 414 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 415 if (prop->len && 0 == strncmp(path, name, name_len)) 416 node = fdt_path_offset(blob, prop->data); 417 if (node <= 0) 418 continue; 419 420 /* Get the alias number */ 421 number = simple_strtoul(path + name_len, NULL, 10); 422 if (number < 0 || number >= maxcount) { 423 debug("%s: warning: alias '%s' is out of range\n", 424 __func__, path); 425 continue; 426 } 427 428 /* Make sure the node we found is actually in our list! */ 429 found = -1; 430 for (j = 0; j < count; j++) 431 if (nodes[j] == node) { 432 found = j; 433 break; 434 } 435 436 if (found == -1) { 437 debug("%s: warning: alias '%s' points to a node " 438 "'%s' that is missing or is not compatible " 439 " with '%s'\n", __func__, path, 440 fdt_get_name(blob, node, NULL), 441 compat_names[id]); 442 continue; 443 } 444 445 /* 446 * Add this node to our list in the right place, and mark 447 * it as done. 448 */ 449 if (fdtdec_get_is_enabled(blob, node)) { 450 if (node_list[number]) { 451 debug("%s: warning: alias '%s' requires that " 452 "a node be placed in the list in a " 453 "position which is already filled by " 454 "node '%s'\n", __func__, path, 455 fdt_get_name(blob, node, NULL)); 456 continue; 457 } 458 node_list[number] = node; 459 if (number >= num_found) 460 num_found = number + 1; 461 } 462 nodes[found] = 0; 463 } 464 465 /* Add any nodes not mentioned by an alias */ 466 for (i = j = 0; i < maxcount; i++) { 467 if (!node_list[i]) { 468 for (; j < maxcount; j++) 469 if (nodes[j] && 470 fdtdec_get_is_enabled(blob, nodes[j])) 471 break; 472 473 /* Have we run out of nodes to add? */ 474 if (j == maxcount) 475 break; 476 477 assert(!node_list[i]); 478 node_list[i] = nodes[j++]; 479 if (i >= num_found) 480 num_found = i + 1; 481 } 482 } 483 484 return num_found; 485 } 486 487 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 488 int *seqp) 489 { 490 int base_len = strlen(base); 491 const char *find_name; 492 int find_namelen; 493 int prop_offset; 494 int aliases; 495 496 find_name = fdt_get_name(blob, offset, &find_namelen); 497 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 498 499 aliases = fdt_path_offset(blob, "/aliases"); 500 for (prop_offset = fdt_first_property_offset(blob, aliases); 501 prop_offset > 0; 502 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 503 const char *prop; 504 const char *name; 505 const char *slash; 506 const char *p; 507 int len; 508 509 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 510 debug(" - %s, %s\n", name, prop); 511 if (len < find_namelen || *prop != '/' || prop[len - 1] || 512 strncmp(name, base, base_len)) 513 continue; 514 515 slash = strrchr(prop, '/'); 516 if (strcmp(slash + 1, find_name)) 517 continue; 518 for (p = name + strlen(name) - 1; p > name; p--) { 519 if (!isdigit(*p)) { 520 *seqp = simple_strtoul(p + 1, NULL, 10); 521 debug("Found seq %d\n", *seqp); 522 return 0; 523 } 524 } 525 } 526 527 debug("Not found\n"); 528 return -ENOENT; 529 } 530 531 int fdtdec_get_chosen_node(const void *blob, const char *name) 532 { 533 const char *prop; 534 int chosen_node; 535 int len; 536 537 if (!blob) 538 return -FDT_ERR_NOTFOUND; 539 chosen_node = fdt_path_offset(blob, "/chosen"); 540 prop = fdt_getprop(blob, chosen_node, name, &len); 541 if (!prop) 542 return -FDT_ERR_NOTFOUND; 543 return fdt_path_offset(blob, prop); 544 } 545 546 int fdtdec_check_fdt(void) 547 { 548 /* 549 * We must have an FDT, but we cannot panic() yet since the console 550 * is not ready. So for now, just assert(). Boards which need an early 551 * FDT (prior to console ready) will need to make their own 552 * arrangements and do their own checks. 553 */ 554 assert(!fdtdec_prepare_fdt()); 555 return 0; 556 } 557 558 /* 559 * This function is a little odd in that it accesses global data. At some 560 * point if the architecture board.c files merge this will make more sense. 561 * Even now, it is common code. 562 */ 563 int fdtdec_prepare_fdt(void) 564 { 565 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 566 fdt_check_header(gd->fdt_blob)) { 567 printf("No valid FDT found - please append one to U-Boot " 568 "binary, use u-boot-dtb.bin or define " 569 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 570 return -1; 571 } 572 return 0; 573 } 574 575 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 576 { 577 const u32 *phandle; 578 int lookup; 579 580 debug("%s: %s\n", __func__, prop_name); 581 phandle = fdt_getprop(blob, node, prop_name, NULL); 582 if (!phandle) 583 return -FDT_ERR_NOTFOUND; 584 585 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 586 return lookup; 587 } 588 589 /** 590 * Look up a property in a node and check that it has a minimum length. 591 * 592 * @param blob FDT blob 593 * @param node node to examine 594 * @param prop_name name of property to find 595 * @param min_len minimum property length in bytes 596 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 597 found, or -FDT_ERR_BADLAYOUT if not enough data 598 * @return pointer to cell, which is only valid if err == 0 599 */ 600 static const void *get_prop_check_min_len(const void *blob, int node, 601 const char *prop_name, int min_len, int *err) 602 { 603 const void *cell; 604 int len; 605 606 debug("%s: %s\n", __func__, prop_name); 607 cell = fdt_getprop(blob, node, prop_name, &len); 608 if (!cell) 609 *err = -FDT_ERR_NOTFOUND; 610 else if (len < min_len) 611 *err = -FDT_ERR_BADLAYOUT; 612 else 613 *err = 0; 614 return cell; 615 } 616 617 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 618 u32 *array, int count) 619 { 620 const u32 *cell; 621 int i, err = 0; 622 623 debug("%s: %s\n", __func__, prop_name); 624 cell = get_prop_check_min_len(blob, node, prop_name, 625 sizeof(u32) * count, &err); 626 if (!err) { 627 for (i = 0; i < count; i++) 628 array[i] = fdt32_to_cpu(cell[i]); 629 } 630 return err; 631 } 632 633 int fdtdec_get_int_array_count(const void *blob, int node, 634 const char *prop_name, u32 *array, int count) 635 { 636 const u32 *cell; 637 int len, elems; 638 int i; 639 640 debug("%s: %s\n", __func__, prop_name); 641 cell = fdt_getprop(blob, node, prop_name, &len); 642 if (!cell) 643 return -FDT_ERR_NOTFOUND; 644 elems = len / sizeof(u32); 645 if (count > elems) 646 count = elems; 647 for (i = 0; i < count; i++) 648 array[i] = fdt32_to_cpu(cell[i]); 649 650 return count; 651 } 652 653 const u32 *fdtdec_locate_array(const void *blob, int node, 654 const char *prop_name, int count) 655 { 656 const u32 *cell; 657 int err; 658 659 cell = get_prop_check_min_len(blob, node, prop_name, 660 sizeof(u32) * count, &err); 661 return err ? NULL : cell; 662 } 663 664 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 665 { 666 const s32 *cell; 667 int len; 668 669 debug("%s: %s\n", __func__, prop_name); 670 cell = fdt_getprop(blob, node, prop_name, &len); 671 return cell != NULL; 672 } 673 674 int fdtdec_parse_phandle_with_args(const void *blob, int src_node, 675 const char *list_name, 676 const char *cells_name, 677 int cell_count, int index, 678 struct fdtdec_phandle_args *out_args) 679 { 680 const __be32 *list, *list_end; 681 int rc = 0, size, cur_index = 0; 682 uint32_t count = 0; 683 int node = -1; 684 int phandle; 685 686 /* Retrieve the phandle list property */ 687 list = fdt_getprop(blob, src_node, list_name, &size); 688 if (!list) 689 return -ENOENT; 690 list_end = list + size / sizeof(*list); 691 692 /* Loop over the phandles until all the requested entry is found */ 693 while (list < list_end) { 694 rc = -EINVAL; 695 count = 0; 696 697 /* 698 * If phandle is 0, then it is an empty entry with no 699 * arguments. Skip forward to the next entry. 700 */ 701 phandle = be32_to_cpup(list++); 702 if (phandle) { 703 /* 704 * Find the provider node and parse the #*-cells 705 * property to determine the argument length. 706 * 707 * This is not needed if the cell count is hard-coded 708 * (i.e. cells_name not set, but cell_count is set), 709 * except when we're going to return the found node 710 * below. 711 */ 712 if (cells_name || cur_index == index) { 713 node = fdt_node_offset_by_phandle(blob, 714 phandle); 715 if (!node) { 716 debug("%s: could not find phandle\n", 717 fdt_get_name(blob, src_node, 718 NULL)); 719 goto err; 720 } 721 } 722 723 if (cells_name) { 724 count = fdtdec_get_int(blob, node, cells_name, 725 -1); 726 if (count == -1) { 727 debug("%s: could not get %s for %s\n", 728 fdt_get_name(blob, src_node, 729 NULL), 730 cells_name, 731 fdt_get_name(blob, node, 732 NULL)); 733 goto err; 734 } 735 } else { 736 count = cell_count; 737 } 738 739 /* 740 * Make sure that the arguments actually fit in the 741 * remaining property data length 742 */ 743 if (list + count > list_end) { 744 debug("%s: arguments longer than property\n", 745 fdt_get_name(blob, src_node, NULL)); 746 goto err; 747 } 748 } 749 750 /* 751 * All of the error cases above bail out of the loop, so at 752 * this point, the parsing is successful. If the requested 753 * index matches, then fill the out_args structure and return, 754 * or return -ENOENT for an empty entry. 755 */ 756 rc = -ENOENT; 757 if (cur_index == index) { 758 if (!phandle) 759 goto err; 760 761 if (out_args) { 762 int i; 763 764 if (count > MAX_PHANDLE_ARGS) { 765 debug("%s: too many arguments %d\n", 766 fdt_get_name(blob, src_node, 767 NULL), count); 768 count = MAX_PHANDLE_ARGS; 769 } 770 out_args->node = node; 771 out_args->args_count = count; 772 for (i = 0; i < count; i++) { 773 out_args->args[i] = 774 be32_to_cpup(list++); 775 } 776 } 777 778 /* Found it! return success */ 779 return 0; 780 } 781 782 node = -1; 783 list += count; 784 cur_index++; 785 } 786 787 /* 788 * Result will be one of: 789 * -ENOENT : index is for empty phandle 790 * -EINVAL : parsing error on data 791 * [1..n] : Number of phandle (count mode; when index = -1) 792 */ 793 rc = index < 0 ? cur_index : -ENOENT; 794 err: 795 return rc; 796 } 797 798 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 799 u8 *array, int count) 800 { 801 const u8 *cell; 802 int err; 803 804 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 805 if (!err) 806 memcpy(array, cell, count); 807 return err; 808 } 809 810 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 811 const char *prop_name, int count) 812 { 813 const u8 *cell; 814 int err; 815 816 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 817 if (err) 818 return NULL; 819 return cell; 820 } 821 822 int fdtdec_get_config_int(const void *blob, const char *prop_name, 823 int default_val) 824 { 825 int config_node; 826 827 debug("%s: %s\n", __func__, prop_name); 828 config_node = fdt_path_offset(blob, "/config"); 829 if (config_node < 0) 830 return default_val; 831 return fdtdec_get_int(blob, config_node, prop_name, default_val); 832 } 833 834 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 835 { 836 int config_node; 837 const void *prop; 838 839 debug("%s: %s\n", __func__, prop_name); 840 config_node = fdt_path_offset(blob, "/config"); 841 if (config_node < 0) 842 return 0; 843 prop = fdt_get_property(blob, config_node, prop_name, NULL); 844 845 return prop != NULL; 846 } 847 848 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 849 { 850 const char *nodep; 851 int nodeoffset; 852 int len; 853 854 debug("%s: %s\n", __func__, prop_name); 855 nodeoffset = fdt_path_offset(blob, "/config"); 856 if (nodeoffset < 0) 857 return NULL; 858 859 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 860 if (!nodep) 861 return NULL; 862 863 return (char *)nodep; 864 } 865 866 int fdtdec_decode_region(const void *blob, int node, const char *prop_name, 867 fdt_addr_t *basep, fdt_size_t *sizep) 868 { 869 const fdt_addr_t *cell; 870 int len; 871 872 debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL), 873 prop_name); 874 cell = fdt_getprop(blob, node, prop_name, &len); 875 if (!cell || (len < sizeof(fdt_addr_t) * 2)) { 876 debug("cell=%p, len=%d\n", cell, len); 877 return -1; 878 } 879 880 *basep = fdt_addr_to_cpu(*cell); 881 *sizep = fdt_size_to_cpu(cell[1]); 882 debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, 883 (ulong)*sizep); 884 885 return 0; 886 } 887 888 /** 889 * Read a flash entry from the fdt 890 * 891 * @param blob FDT blob 892 * @param node Offset of node to read 893 * @param name Name of node being read 894 * @param entry Place to put offset and size of this node 895 * @return 0 if ok, -ve on error 896 */ 897 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 898 struct fmap_entry *entry) 899 { 900 const char *prop; 901 u32 reg[2]; 902 903 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 904 debug("Node '%s' has bad/missing 'reg' property\n", name); 905 return -FDT_ERR_NOTFOUND; 906 } 907 entry->offset = reg[0]; 908 entry->length = reg[1]; 909 entry->used = fdtdec_get_int(blob, node, "used", entry->length); 910 prop = fdt_getprop(blob, node, "compress", NULL); 911 entry->compress_algo = prop && !strcmp(prop, "lzo") ? 912 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE; 913 prop = fdt_getprop(blob, node, "hash", &entry->hash_size); 914 entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE; 915 entry->hash = (uint8_t *)prop; 916 917 return 0; 918 } 919 920 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 921 { 922 u64 number = 0; 923 924 while (cells--) 925 number = (number << 32) | fdt32_to_cpu(*ptr++); 926 927 return number; 928 } 929 930 int fdt_get_resource(const void *fdt, int node, const char *property, 931 unsigned int index, struct fdt_resource *res) 932 { 933 const fdt32_t *ptr, *end; 934 int na, ns, len, parent; 935 unsigned int i = 0; 936 937 parent = fdt_parent_offset(fdt, node); 938 if (parent < 0) 939 return parent; 940 941 na = fdt_address_cells(fdt, parent); 942 ns = fdt_size_cells(fdt, parent); 943 944 ptr = fdt_getprop(fdt, node, property, &len); 945 if (!ptr) 946 return len; 947 948 end = ptr + len / sizeof(*ptr); 949 950 while (ptr + na + ns <= end) { 951 if (i == index) { 952 res->start = res->end = fdtdec_get_number(ptr, na); 953 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 954 return 0; 955 } 956 957 ptr += na + ns; 958 i++; 959 } 960 961 return -FDT_ERR_NOTFOUND; 962 } 963 964 int fdt_get_named_resource(const void *fdt, int node, const char *property, 965 const char *prop_names, const char *name, 966 struct fdt_resource *res) 967 { 968 int index; 969 970 index = fdt_find_string(fdt, node, prop_names, name); 971 if (index < 0) 972 return index; 973 974 return fdt_get_resource(fdt, node, property, index, res); 975 } 976 977 int fdtdec_decode_memory_region(const void *blob, int config_node, 978 const char *mem_type, const char *suffix, 979 fdt_addr_t *basep, fdt_size_t *sizep) 980 { 981 char prop_name[50]; 982 const char *mem; 983 fdt_size_t size, offset_size; 984 fdt_addr_t base, offset; 985 int node; 986 987 if (config_node == -1) { 988 config_node = fdt_path_offset(blob, "/config"); 989 if (config_node < 0) { 990 debug("%s: Cannot find /config node\n", __func__); 991 return -ENOENT; 992 } 993 } 994 if (!suffix) 995 suffix = ""; 996 997 snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, 998 suffix); 999 mem = fdt_getprop(blob, config_node, prop_name, NULL); 1000 if (!mem) { 1001 debug("%s: No memory type for '%s', using /memory\n", __func__, 1002 prop_name); 1003 mem = "/memory"; 1004 } 1005 1006 node = fdt_path_offset(blob, mem); 1007 if (node < 0) { 1008 debug("%s: Failed to find node '%s': %s\n", __func__, mem, 1009 fdt_strerror(node)); 1010 return -ENOENT; 1011 } 1012 1013 /* 1014 * Not strictly correct - the memory may have multiple banks. We just 1015 * use the first 1016 */ 1017 if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { 1018 debug("%s: Failed to decode memory region %s\n", __func__, 1019 mem); 1020 return -EINVAL; 1021 } 1022 1023 snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, 1024 suffix); 1025 if (fdtdec_decode_region(blob, config_node, prop_name, &offset, 1026 &offset_size)) { 1027 debug("%s: Failed to decode memory region '%s'\n", __func__, 1028 prop_name); 1029 return -EINVAL; 1030 } 1031 1032 *basep = base + offset; 1033 *sizep = offset_size; 1034 1035 return 0; 1036 } 1037 #endif 1038