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 COMPAT(INTEL_ICH_SPI, "intel,ich-spi"), 87 }; 88 89 const char *fdtdec_get_compatible(enum fdt_compat_id id) 90 { 91 /* We allow reading of the 'unknown' ID for testing purposes */ 92 assert(id >= 0 && id < COMPAT_COUNT); 93 return compat_names[id]; 94 } 95 96 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 97 const char *prop_name, fdt_size_t *sizep) 98 { 99 const fdt_addr_t *cell; 100 int len; 101 102 debug("%s: %s: ", __func__, prop_name); 103 cell = fdt_getprop(blob, node, prop_name, &len); 104 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 105 len == sizeof(fdt_addr_t) * 2)) { 106 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 107 if (sizep) { 108 const fdt_size_t *size; 109 110 size = (fdt_size_t *)((char *)cell + 111 sizeof(fdt_addr_t)); 112 *sizep = fdt_size_to_cpu(*size); 113 debug("addr=%08lx, size=%08x\n", 114 (ulong)addr, *sizep); 115 } else { 116 debug("%08lx\n", (ulong)addr); 117 } 118 return addr; 119 } 120 debug("(not found)\n"); 121 return FDT_ADDR_T_NONE; 122 } 123 124 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 125 const char *prop_name) 126 { 127 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 128 } 129 130 #ifdef CONFIG_PCI 131 int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type, 132 const char *prop_name, struct fdt_pci_addr *addr) 133 { 134 const u32 *cell; 135 int len; 136 int ret = -ENOENT; 137 138 debug("%s: %s: ", __func__, prop_name); 139 140 /* 141 * If we follow the pci bus bindings strictly, we should check 142 * the value of the node's parent node's #address-cells and 143 * #size-cells. They need to be 3 and 2 accordingly. However, 144 * for simplicity we skip the check here. 145 */ 146 cell = fdt_getprop(blob, node, prop_name, &len); 147 if (!cell) 148 goto fail; 149 150 if ((len % FDT_PCI_REG_SIZE) == 0) { 151 int num = len / FDT_PCI_REG_SIZE; 152 int i; 153 154 for (i = 0; i < num; i++) { 155 debug("pci address #%d: %08lx %08lx %08lx\n", i, 156 (ulong)fdt_addr_to_cpu(cell[0]), 157 (ulong)fdt_addr_to_cpu(cell[1]), 158 (ulong)fdt_addr_to_cpu(cell[2])); 159 if ((fdt_addr_to_cpu(*cell) & type) == type) { 160 addr->phys_hi = fdt_addr_to_cpu(cell[0]); 161 addr->phys_mid = fdt_addr_to_cpu(cell[1]); 162 addr->phys_lo = fdt_addr_to_cpu(cell[2]); 163 break; 164 } else { 165 cell += (FDT_PCI_ADDR_CELLS + 166 FDT_PCI_SIZE_CELLS); 167 } 168 } 169 170 if (i == num) 171 goto fail; 172 173 return 0; 174 } else { 175 ret = -EINVAL; 176 } 177 178 fail: 179 debug("(not found)\n"); 180 return ret; 181 } 182 183 int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device) 184 { 185 const char *list, *end; 186 int len; 187 188 list = fdt_getprop(blob, node, "compatible", &len); 189 if (!list) 190 return -ENOENT; 191 192 end = list + len; 193 while (list < end) { 194 char *s; 195 196 len = strlen(list); 197 if (len >= strlen("pciVVVV,DDDD")) { 198 s = strstr(list, "pci"); 199 200 /* 201 * check if the string is something like pciVVVV,DDDD.RR 202 * or just pciVVVV,DDDD 203 */ 204 if (s && s[7] == ',' && 205 (s[12] == '.' || s[12] == 0)) { 206 s += 3; 207 *vendor = simple_strtol(s, NULL, 16); 208 209 s += 5; 210 *device = simple_strtol(s, NULL, 16); 211 212 return 0; 213 } 214 } else { 215 list += (len + 1); 216 } 217 } 218 219 return -ENOENT; 220 } 221 222 int fdtdec_get_pci_bdf(const void *blob, int node, 223 struct fdt_pci_addr *addr, pci_dev_t *bdf) 224 { 225 u16 dt_vendor, dt_device, vendor, device; 226 int ret; 227 228 /* get vendor id & device id from the compatible string */ 229 ret = fdtdec_get_pci_vendev(blob, node, &dt_vendor, &dt_device); 230 if (ret) 231 return ret; 232 233 /* extract the bdf from fdt_pci_addr */ 234 *bdf = addr->phys_hi & 0xffff00; 235 236 /* read vendor id & device id based on bdf */ 237 pci_read_config_word(*bdf, PCI_VENDOR_ID, &vendor); 238 pci_read_config_word(*bdf, PCI_DEVICE_ID, &device); 239 240 /* 241 * Note there are two places in the device tree to fully describe 242 * a pci device: one is via compatible string with a format of 243 * "pciVVVV,DDDD" and the other one is the bdf numbers encoded in 244 * the device node's reg address property. We read the vendor id 245 * and device id based on bdf and compare the values with the 246 * "VVVV,DDDD". If they are the same, then we are good to use bdf 247 * to read device's bar. But if they are different, we have to rely 248 * on the vendor id and device id extracted from the compatible 249 * string and locate the real bdf by pci_find_device(). This is 250 * because normally we may only know device's device number and 251 * function number when writing device tree. The bus number is 252 * dynamically assigned during the pci enumeration process. 253 */ 254 if ((dt_vendor != vendor) || (dt_device != device)) { 255 *bdf = pci_find_device(dt_vendor, dt_device, 0); 256 if (*bdf == -1) 257 return -ENODEV; 258 } 259 260 return 0; 261 } 262 263 int fdtdec_get_pci_bar32(const void *blob, int node, 264 struct fdt_pci_addr *addr, u32 *bar) 265 { 266 pci_dev_t bdf; 267 int barnum; 268 int ret; 269 270 /* get pci devices's bdf */ 271 ret = fdtdec_get_pci_bdf(blob, node, addr, &bdf); 272 if (ret) 273 return ret; 274 275 /* extract the bar number from fdt_pci_addr */ 276 barnum = addr->phys_hi & 0xff; 277 if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS)) 278 return -EINVAL; 279 280 barnum = (barnum - PCI_BASE_ADDRESS_0) / 4; 281 *bar = pci_read_bar32(pci_bus_to_hose(PCI_BUS(bdf)), bdf, barnum); 282 283 return 0; 284 } 285 #endif 286 287 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 288 uint64_t default_val) 289 { 290 const uint64_t *cell64; 291 int length; 292 293 cell64 = fdt_getprop(blob, node, prop_name, &length); 294 if (!cell64 || length < sizeof(*cell64)) 295 return default_val; 296 297 return fdt64_to_cpu(*cell64); 298 } 299 300 int fdtdec_get_is_enabled(const void *blob, int node) 301 { 302 const char *cell; 303 304 /* 305 * It should say "okay", so only allow that. Some fdts use "ok" but 306 * this is a bug. Please fix your device tree source file. See here 307 * for discussion: 308 * 309 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 310 */ 311 cell = fdt_getprop(blob, node, "status", NULL); 312 if (cell) 313 return 0 == strcmp(cell, "okay"); 314 return 1; 315 } 316 317 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 318 { 319 enum fdt_compat_id id; 320 321 /* Search our drivers */ 322 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 323 if (0 == fdt_node_check_compatible(blob, node, 324 compat_names[id])) 325 return id; 326 return COMPAT_UNKNOWN; 327 } 328 329 int fdtdec_next_compatible(const void *blob, int node, 330 enum fdt_compat_id id) 331 { 332 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 333 } 334 335 int fdtdec_next_compatible_subnode(const void *blob, int node, 336 enum fdt_compat_id id, int *depthp) 337 { 338 do { 339 node = fdt_next_node(blob, node, depthp); 340 } while (*depthp > 1); 341 342 /* If this is a direct subnode, and compatible, return it */ 343 if (*depthp == 1 && 0 == fdt_node_check_compatible( 344 blob, node, compat_names[id])) 345 return node; 346 347 return -FDT_ERR_NOTFOUND; 348 } 349 350 int fdtdec_next_alias(const void *blob, const char *name, 351 enum fdt_compat_id id, int *upto) 352 { 353 #define MAX_STR_LEN 20 354 char str[MAX_STR_LEN + 20]; 355 int node, err; 356 357 /* snprintf() is not available */ 358 assert(strlen(name) < MAX_STR_LEN); 359 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 360 node = fdt_path_offset(blob, str); 361 if (node < 0) 362 return node; 363 err = fdt_node_check_compatible(blob, node, compat_names[id]); 364 if (err < 0) 365 return err; 366 if (err) 367 return -FDT_ERR_NOTFOUND; 368 (*upto)++; 369 return node; 370 } 371 372 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 373 enum fdt_compat_id id, int *node_list, int maxcount) 374 { 375 memset(node_list, '\0', sizeof(*node_list) * maxcount); 376 377 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 378 } 379 380 /* TODO: Can we tighten this code up a little? */ 381 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 382 enum fdt_compat_id id, int *node_list, int maxcount) 383 { 384 int name_len = strlen(name); 385 int nodes[maxcount]; 386 int num_found = 0; 387 int offset, node; 388 int alias_node; 389 int count; 390 int i, j; 391 392 /* find the alias node if present */ 393 alias_node = fdt_path_offset(blob, "/aliases"); 394 395 /* 396 * start with nothing, and we can assume that the root node can't 397 * match 398 */ 399 memset(nodes, '\0', sizeof(nodes)); 400 401 /* First find all the compatible nodes */ 402 for (node = count = 0; node >= 0 && count < maxcount;) { 403 node = fdtdec_next_compatible(blob, node, id); 404 if (node >= 0) 405 nodes[count++] = node; 406 } 407 if (node >= 0) 408 debug("%s: warning: maxcount exceeded with alias '%s'\n", 409 __func__, name); 410 411 /* Now find all the aliases */ 412 for (offset = fdt_first_property_offset(blob, alias_node); 413 offset > 0; 414 offset = fdt_next_property_offset(blob, offset)) { 415 const struct fdt_property *prop; 416 const char *path; 417 int number; 418 int found; 419 420 node = 0; 421 prop = fdt_get_property_by_offset(blob, offset, NULL); 422 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 423 if (prop->len && 0 == strncmp(path, name, name_len)) 424 node = fdt_path_offset(blob, prop->data); 425 if (node <= 0) 426 continue; 427 428 /* Get the alias number */ 429 number = simple_strtoul(path + name_len, NULL, 10); 430 if (number < 0 || number >= maxcount) { 431 debug("%s: warning: alias '%s' is out of range\n", 432 __func__, path); 433 continue; 434 } 435 436 /* Make sure the node we found is actually in our list! */ 437 found = -1; 438 for (j = 0; j < count; j++) 439 if (nodes[j] == node) { 440 found = j; 441 break; 442 } 443 444 if (found == -1) { 445 debug("%s: warning: alias '%s' points to a node " 446 "'%s' that is missing or is not compatible " 447 " with '%s'\n", __func__, path, 448 fdt_get_name(blob, node, NULL), 449 compat_names[id]); 450 continue; 451 } 452 453 /* 454 * Add this node to our list in the right place, and mark 455 * it as done. 456 */ 457 if (fdtdec_get_is_enabled(blob, node)) { 458 if (node_list[number]) { 459 debug("%s: warning: alias '%s' requires that " 460 "a node be placed in the list in a " 461 "position which is already filled by " 462 "node '%s'\n", __func__, path, 463 fdt_get_name(blob, node, NULL)); 464 continue; 465 } 466 node_list[number] = node; 467 if (number >= num_found) 468 num_found = number + 1; 469 } 470 nodes[found] = 0; 471 } 472 473 /* Add any nodes not mentioned by an alias */ 474 for (i = j = 0; i < maxcount; i++) { 475 if (!node_list[i]) { 476 for (; j < maxcount; j++) 477 if (nodes[j] && 478 fdtdec_get_is_enabled(blob, nodes[j])) 479 break; 480 481 /* Have we run out of nodes to add? */ 482 if (j == maxcount) 483 break; 484 485 assert(!node_list[i]); 486 node_list[i] = nodes[j++]; 487 if (i >= num_found) 488 num_found = i + 1; 489 } 490 } 491 492 return num_found; 493 } 494 495 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 496 int *seqp) 497 { 498 int base_len = strlen(base); 499 const char *find_name; 500 int find_namelen; 501 int prop_offset; 502 int aliases; 503 504 find_name = fdt_get_name(blob, offset, &find_namelen); 505 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 506 507 aliases = fdt_path_offset(blob, "/aliases"); 508 for (prop_offset = fdt_first_property_offset(blob, aliases); 509 prop_offset > 0; 510 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 511 const char *prop; 512 const char *name; 513 const char *slash; 514 const char *p; 515 int len; 516 517 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 518 debug(" - %s, %s\n", name, prop); 519 if (len < find_namelen || *prop != '/' || prop[len - 1] || 520 strncmp(name, base, base_len)) 521 continue; 522 523 slash = strrchr(prop, '/'); 524 if (strcmp(slash + 1, find_name)) 525 continue; 526 for (p = name + strlen(name) - 1; p > name; p--) { 527 if (!isdigit(*p)) { 528 *seqp = simple_strtoul(p + 1, NULL, 10); 529 debug("Found seq %d\n", *seqp); 530 return 0; 531 } 532 } 533 } 534 535 debug("Not found\n"); 536 return -ENOENT; 537 } 538 539 int fdtdec_get_chosen_node(const void *blob, const char *name) 540 { 541 const char *prop; 542 int chosen_node; 543 int len; 544 545 if (!blob) 546 return -FDT_ERR_NOTFOUND; 547 chosen_node = fdt_path_offset(blob, "/chosen"); 548 prop = fdt_getprop(blob, chosen_node, name, &len); 549 if (!prop) 550 return -FDT_ERR_NOTFOUND; 551 return fdt_path_offset(blob, prop); 552 } 553 554 int fdtdec_check_fdt(void) 555 { 556 /* 557 * We must have an FDT, but we cannot panic() yet since the console 558 * is not ready. So for now, just assert(). Boards which need an early 559 * FDT (prior to console ready) will need to make their own 560 * arrangements and do their own checks. 561 */ 562 assert(!fdtdec_prepare_fdt()); 563 return 0; 564 } 565 566 /* 567 * This function is a little odd in that it accesses global data. At some 568 * point if the architecture board.c files merge this will make more sense. 569 * Even now, it is common code. 570 */ 571 int fdtdec_prepare_fdt(void) 572 { 573 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 574 fdt_check_header(gd->fdt_blob)) { 575 printf("No valid FDT found - please append one to U-Boot " 576 "binary, use u-boot-dtb.bin or define " 577 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 578 return -1; 579 } 580 return 0; 581 } 582 583 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 584 { 585 const u32 *phandle; 586 int lookup; 587 588 debug("%s: %s\n", __func__, prop_name); 589 phandle = fdt_getprop(blob, node, prop_name, NULL); 590 if (!phandle) 591 return -FDT_ERR_NOTFOUND; 592 593 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 594 return lookup; 595 } 596 597 /** 598 * Look up a property in a node and check that it has a minimum length. 599 * 600 * @param blob FDT blob 601 * @param node node to examine 602 * @param prop_name name of property to find 603 * @param min_len minimum property length in bytes 604 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 605 found, or -FDT_ERR_BADLAYOUT if not enough data 606 * @return pointer to cell, which is only valid if err == 0 607 */ 608 static const void *get_prop_check_min_len(const void *blob, int node, 609 const char *prop_name, int min_len, int *err) 610 { 611 const void *cell; 612 int len; 613 614 debug("%s: %s\n", __func__, prop_name); 615 cell = fdt_getprop(blob, node, prop_name, &len); 616 if (!cell) 617 *err = -FDT_ERR_NOTFOUND; 618 else if (len < min_len) 619 *err = -FDT_ERR_BADLAYOUT; 620 else 621 *err = 0; 622 return cell; 623 } 624 625 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 626 u32 *array, int count) 627 { 628 const u32 *cell; 629 int i, err = 0; 630 631 debug("%s: %s\n", __func__, prop_name); 632 cell = get_prop_check_min_len(blob, node, prop_name, 633 sizeof(u32) * count, &err); 634 if (!err) { 635 for (i = 0; i < count; i++) 636 array[i] = fdt32_to_cpu(cell[i]); 637 } 638 return err; 639 } 640 641 int fdtdec_get_int_array_count(const void *blob, int node, 642 const char *prop_name, u32 *array, int count) 643 { 644 const u32 *cell; 645 int len, elems; 646 int i; 647 648 debug("%s: %s\n", __func__, prop_name); 649 cell = fdt_getprop(blob, node, prop_name, &len); 650 if (!cell) 651 return -FDT_ERR_NOTFOUND; 652 elems = len / sizeof(u32); 653 if (count > elems) 654 count = elems; 655 for (i = 0; i < count; i++) 656 array[i] = fdt32_to_cpu(cell[i]); 657 658 return count; 659 } 660 661 const u32 *fdtdec_locate_array(const void *blob, int node, 662 const char *prop_name, int count) 663 { 664 const u32 *cell; 665 int err; 666 667 cell = get_prop_check_min_len(blob, node, prop_name, 668 sizeof(u32) * count, &err); 669 return err ? NULL : cell; 670 } 671 672 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 673 { 674 const s32 *cell; 675 int len; 676 677 debug("%s: %s\n", __func__, prop_name); 678 cell = fdt_getprop(blob, node, prop_name, &len); 679 return cell != NULL; 680 } 681 682 int fdtdec_parse_phandle_with_args(const void *blob, int src_node, 683 const char *list_name, 684 const char *cells_name, 685 int cell_count, int index, 686 struct fdtdec_phandle_args *out_args) 687 { 688 const __be32 *list, *list_end; 689 int rc = 0, size, cur_index = 0; 690 uint32_t count = 0; 691 int node = -1; 692 int phandle; 693 694 /* Retrieve the phandle list property */ 695 list = fdt_getprop(blob, src_node, list_name, &size); 696 if (!list) 697 return -ENOENT; 698 list_end = list + size / sizeof(*list); 699 700 /* Loop over the phandles until all the requested entry is found */ 701 while (list < list_end) { 702 rc = -EINVAL; 703 count = 0; 704 705 /* 706 * If phandle is 0, then it is an empty entry with no 707 * arguments. Skip forward to the next entry. 708 */ 709 phandle = be32_to_cpup(list++); 710 if (phandle) { 711 /* 712 * Find the provider node and parse the #*-cells 713 * property to determine the argument length. 714 * 715 * This is not needed if the cell count is hard-coded 716 * (i.e. cells_name not set, but cell_count is set), 717 * except when we're going to return the found node 718 * below. 719 */ 720 if (cells_name || cur_index == index) { 721 node = fdt_node_offset_by_phandle(blob, 722 phandle); 723 if (!node) { 724 debug("%s: could not find phandle\n", 725 fdt_get_name(blob, src_node, 726 NULL)); 727 goto err; 728 } 729 } 730 731 if (cells_name) { 732 count = fdtdec_get_int(blob, node, cells_name, 733 -1); 734 if (count == -1) { 735 debug("%s: could not get %s for %s\n", 736 fdt_get_name(blob, src_node, 737 NULL), 738 cells_name, 739 fdt_get_name(blob, node, 740 NULL)); 741 goto err; 742 } 743 } else { 744 count = cell_count; 745 } 746 747 /* 748 * Make sure that the arguments actually fit in the 749 * remaining property data length 750 */ 751 if (list + count > list_end) { 752 debug("%s: arguments longer than property\n", 753 fdt_get_name(blob, src_node, NULL)); 754 goto err; 755 } 756 } 757 758 /* 759 * All of the error cases above bail out of the loop, so at 760 * this point, the parsing is successful. If the requested 761 * index matches, then fill the out_args structure and return, 762 * or return -ENOENT for an empty entry. 763 */ 764 rc = -ENOENT; 765 if (cur_index == index) { 766 if (!phandle) 767 goto err; 768 769 if (out_args) { 770 int i; 771 772 if (count > MAX_PHANDLE_ARGS) { 773 debug("%s: too many arguments %d\n", 774 fdt_get_name(blob, src_node, 775 NULL), count); 776 count = MAX_PHANDLE_ARGS; 777 } 778 out_args->node = node; 779 out_args->args_count = count; 780 for (i = 0; i < count; i++) { 781 out_args->args[i] = 782 be32_to_cpup(list++); 783 } 784 } 785 786 /* Found it! return success */ 787 return 0; 788 } 789 790 node = -1; 791 list += count; 792 cur_index++; 793 } 794 795 /* 796 * Result will be one of: 797 * -ENOENT : index is for empty phandle 798 * -EINVAL : parsing error on data 799 * [1..n] : Number of phandle (count mode; when index = -1) 800 */ 801 rc = index < 0 ? cur_index : -ENOENT; 802 err: 803 return rc; 804 } 805 806 /** 807 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 808 * terminating item. 809 * 810 * @param blob FDT blob to use 811 * @param node Node to look at 812 * @param prop_name Node property name 813 * @param gpio Array of gpio elements to fill from FDT. This will be 814 * untouched if either 0 or an error is returned 815 * @param max_count Maximum number of elements allowed 816 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 817 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 818 */ 819 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 820 struct fdt_gpio_state *gpio, int max_count) 821 { 822 const struct fdt_property *prop; 823 const u32 *cell; 824 const char *name; 825 int len, i; 826 827 debug("%s: %s\n", __func__, prop_name); 828 assert(max_count > 0); 829 prop = fdt_get_property(blob, node, prop_name, &len); 830 if (!prop) { 831 debug("%s: property '%s' missing\n", __func__, prop_name); 832 return -FDT_ERR_NOTFOUND; 833 } 834 835 /* We will use the name to tag the GPIO */ 836 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 837 cell = (u32 *)prop->data; 838 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 839 if (len > max_count) { 840 debug(" %s: too many GPIOs / cells for " 841 "property '%s'\n", __func__, prop_name); 842 return -FDT_ERR_BADLAYOUT; 843 } 844 845 /* Read out the GPIO data from the cells */ 846 for (i = 0; i < len; i++, cell += 3) { 847 gpio[i].gpio = fdt32_to_cpu(cell[1]); 848 gpio[i].flags = fdt32_to_cpu(cell[2]); 849 gpio[i].name = name; 850 } 851 852 return len; 853 } 854 855 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 856 struct fdt_gpio_state *gpio) 857 { 858 int err; 859 860 debug("%s: %s\n", __func__, prop_name); 861 gpio->gpio = FDT_GPIO_NONE; 862 gpio->name = NULL; 863 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 864 return err == 1 ? 0 : err; 865 } 866 867 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 868 { 869 int val; 870 871 if (!fdt_gpio_isvalid(gpio)) 872 return -1; 873 874 val = gpio_get_value(gpio->gpio); 875 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 876 } 877 878 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 879 { 880 if (!fdt_gpio_isvalid(gpio)) 881 return -1; 882 883 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 884 return gpio_set_value(gpio->gpio, val); 885 } 886 887 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 888 { 889 /* 890 * Return success if there is no GPIO defined. This is used for 891 * optional GPIOs) 892 */ 893 if (!fdt_gpio_isvalid(gpio)) 894 return 0; 895 896 if (gpio_request(gpio->gpio, gpio->name)) 897 return -1; 898 return 0; 899 } 900 901 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 902 u8 *array, int count) 903 { 904 const u8 *cell; 905 int err; 906 907 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 908 if (!err) 909 memcpy(array, cell, count); 910 return err; 911 } 912 913 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 914 const char *prop_name, int count) 915 { 916 const u8 *cell; 917 int err; 918 919 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 920 if (err) 921 return NULL; 922 return cell; 923 } 924 925 int fdtdec_get_config_int(const void *blob, const char *prop_name, 926 int default_val) 927 { 928 int config_node; 929 930 debug("%s: %s\n", __func__, prop_name); 931 config_node = fdt_path_offset(blob, "/config"); 932 if (config_node < 0) 933 return default_val; 934 return fdtdec_get_int(blob, config_node, prop_name, default_val); 935 } 936 937 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 938 { 939 int config_node; 940 const void *prop; 941 942 debug("%s: %s\n", __func__, prop_name); 943 config_node = fdt_path_offset(blob, "/config"); 944 if (config_node < 0) 945 return 0; 946 prop = fdt_get_property(blob, config_node, prop_name, NULL); 947 948 return prop != NULL; 949 } 950 951 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 952 { 953 const char *nodep; 954 int nodeoffset; 955 int len; 956 957 debug("%s: %s\n", __func__, prop_name); 958 nodeoffset = fdt_path_offset(blob, "/config"); 959 if (nodeoffset < 0) 960 return NULL; 961 962 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 963 if (!nodep) 964 return NULL; 965 966 return (char *)nodep; 967 } 968 969 int fdtdec_decode_region(const void *blob, int node, const char *prop_name, 970 fdt_addr_t *basep, fdt_size_t *sizep) 971 { 972 const fdt_addr_t *cell; 973 int len; 974 975 debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL), 976 prop_name); 977 cell = fdt_getprop(blob, node, prop_name, &len); 978 if (!cell || (len < sizeof(fdt_addr_t) * 2)) { 979 debug("cell=%p, len=%d\n", cell, len); 980 return -1; 981 } 982 983 *basep = fdt_addr_to_cpu(*cell); 984 *sizep = fdt_size_to_cpu(cell[1]); 985 debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, 986 (ulong)*sizep); 987 988 return 0; 989 } 990 991 /** 992 * Read a flash entry from the fdt 993 * 994 * @param blob FDT blob 995 * @param node Offset of node to read 996 * @param name Name of node being read 997 * @param entry Place to put offset and size of this node 998 * @return 0 if ok, -ve on error 999 */ 1000 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 1001 struct fmap_entry *entry) 1002 { 1003 const char *prop; 1004 u32 reg[2]; 1005 1006 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 1007 debug("Node '%s' has bad/missing 'reg' property\n", name); 1008 return -FDT_ERR_NOTFOUND; 1009 } 1010 entry->offset = reg[0]; 1011 entry->length = reg[1]; 1012 entry->used = fdtdec_get_int(blob, node, "used", entry->length); 1013 prop = fdt_getprop(blob, node, "compress", NULL); 1014 entry->compress_algo = prop && !strcmp(prop, "lzo") ? 1015 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE; 1016 prop = fdt_getprop(blob, node, "hash", &entry->hash_size); 1017 entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE; 1018 entry->hash = (uint8_t *)prop; 1019 1020 return 0; 1021 } 1022 1023 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 1024 { 1025 u64 number = 0; 1026 1027 while (cells--) 1028 number = (number << 32) | fdt32_to_cpu(*ptr++); 1029 1030 return number; 1031 } 1032 1033 int fdt_get_resource(const void *fdt, int node, const char *property, 1034 unsigned int index, struct fdt_resource *res) 1035 { 1036 const fdt32_t *ptr, *end; 1037 int na, ns, len, parent; 1038 unsigned int i = 0; 1039 1040 parent = fdt_parent_offset(fdt, node); 1041 if (parent < 0) 1042 return parent; 1043 1044 na = fdt_address_cells(fdt, parent); 1045 ns = fdt_size_cells(fdt, parent); 1046 1047 ptr = fdt_getprop(fdt, node, property, &len); 1048 if (!ptr) 1049 return len; 1050 1051 end = ptr + len / sizeof(*ptr); 1052 1053 while (ptr + na + ns <= end) { 1054 if (i == index) { 1055 res->start = res->end = fdtdec_get_number(ptr, na); 1056 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 1057 return 0; 1058 } 1059 1060 ptr += na + ns; 1061 i++; 1062 } 1063 1064 return -FDT_ERR_NOTFOUND; 1065 } 1066 1067 int fdt_get_named_resource(const void *fdt, int node, const char *property, 1068 const char *prop_names, const char *name, 1069 struct fdt_resource *res) 1070 { 1071 int index; 1072 1073 index = fdt_find_string(fdt, node, prop_names, name); 1074 if (index < 0) 1075 return index; 1076 1077 return fdt_get_resource(fdt, node, property, index, res); 1078 } 1079 1080 int fdtdec_decode_memory_region(const void *blob, int config_node, 1081 const char *mem_type, const char *suffix, 1082 fdt_addr_t *basep, fdt_size_t *sizep) 1083 { 1084 char prop_name[50]; 1085 const char *mem; 1086 fdt_size_t size, offset_size; 1087 fdt_addr_t base, offset; 1088 int node; 1089 1090 if (config_node == -1) { 1091 config_node = fdt_path_offset(blob, "/config"); 1092 if (config_node < 0) { 1093 debug("%s: Cannot find /config node\n", __func__); 1094 return -ENOENT; 1095 } 1096 } 1097 if (!suffix) 1098 suffix = ""; 1099 1100 snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, 1101 suffix); 1102 mem = fdt_getprop(blob, config_node, prop_name, NULL); 1103 if (!mem) { 1104 debug("%s: No memory type for '%s', using /memory\n", __func__, 1105 prop_name); 1106 mem = "/memory"; 1107 } 1108 1109 node = fdt_path_offset(blob, mem); 1110 if (node < 0) { 1111 debug("%s: Failed to find node '%s': %s\n", __func__, mem, 1112 fdt_strerror(node)); 1113 return -ENOENT; 1114 } 1115 1116 /* 1117 * Not strictly correct - the memory may have multiple banks. We just 1118 * use the first 1119 */ 1120 if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { 1121 debug("%s: Failed to decode memory region %s\n", __func__, 1122 mem); 1123 return -EINVAL; 1124 } 1125 1126 snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, 1127 suffix); 1128 if (fdtdec_decode_region(blob, config_node, prop_name, &offset, 1129 &offset_size)) { 1130 debug("%s: Failed to decode memory region '%s'\n", __func__, 1131 prop_name); 1132 return -EINVAL; 1133 } 1134 1135 *basep = base + offset; 1136 *sizep = offset_size; 1137 1138 return 0; 1139 } 1140 #endif 1141