fdtdec.c 32 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef USE_HOSTCC
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <serial.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <fdtdec.h>
#include <asm/sections.h>
#include <linux/ctype.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Here are the type we know about. One day we might allow drivers to
 * register. For now we just put them here. The COMPAT macro allows us to
 * turn this into a sparse list later, and keeps the ID with the name.
 *
 * NOTE: This list is basically a TODO list for things that need to be
 * converted to driver model. So don't add new things here unless there is a
 * good reason why driver-model conversion is infeasible. Examples include
 * things which are used before driver model is available.
 */
#define COMPAT(id, name) name
static const char * const compat_names[COMPAT_COUNT] = {
	COMPAT(UNKNOWN, "<none>"),
	COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
	COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
	COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
	COMPAT(NVIDIA_TEGRA124_PMC, "nvidia,tegra124-pmc"),
	COMPAT(NVIDIA_TEGRA186_SDMMC, "nvidia,tegra186-sdhci"),
	COMPAT(NVIDIA_TEGRA210_SDMMC, "nvidia,tegra210-sdhci"),
	COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
	COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
	COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
	COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
	COMPAT(NVIDIA_TEGRA210_XUSB_PADCTL, "nvidia,tegra210-xusb-padctl"),
	COMPAT(SMSC_LAN9215, "smsc,lan9215"),
	COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
	COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
	COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
	COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
	COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
	COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
	COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
	COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
	COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
	COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
	COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686"),
	COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
	COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
	COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
	COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
	COMPAT(INTEL_MICROCODE, "intel,microcode"),
	COMPAT(AMS_AS3722, "ams,as3722"),
	COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
	COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"),
	COMPAT(ALTERA_SOCFPGA_DWMMC, "altr,socfpga-dw-mshc"),
	COMPAT(ALTERA_SOCFPGA_DWC2USB, "snps,dwc2"),
	COMPAT(INTEL_BAYTRAIL_FSP, "intel,baytrail-fsp"),
	COMPAT(INTEL_BAYTRAIL_FSP_MDP, "intel,baytrail-fsp-mdp"),
	COMPAT(INTEL_IVYBRIDGE_FSP, "intel,ivybridge-fsp"),
	COMPAT(COMPAT_SUNXI_NAND, "allwinner,sun4i-a10-nand"),
	COMPAT(ALTERA_SOCFPGA_CLK, "altr,clk-mgr"),
	COMPAT(ALTERA_SOCFPGA_PINCTRL_SINGLE, "pinctrl-single"),
	COMPAT(ALTERA_SOCFPGA_H2F_BRG, "altr,socfpga-hps2fpga-bridge"),
	COMPAT(ALTERA_SOCFPGA_LWH2F_BRG, "altr,socfpga-lwhps2fpga-bridge"),
	COMPAT(ALTERA_SOCFPGA_F2H_BRG, "altr,socfpga-fpga2hps-bridge"),
	COMPAT(ALTERA_SOCFPGA_F2SDR0, "altr,socfpga-fpga2sdram0-bridge"),
	COMPAT(ALTERA_SOCFPGA_F2SDR1, "altr,socfpga-fpga2sdram1-bridge"),
	COMPAT(ALTERA_SOCFPGA_F2SDR2, "altr,socfpga-fpga2sdram2-bridge"),
};

const char *fdtdec_get_compatible(enum fdt_compat_id id)
{
	/* We allow reading of the 'unknown' ID for testing purposes */
	assert(id >= 0 && id < COMPAT_COUNT);
	return compat_names[id];
}

fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
		const char *prop_name, int index, int na, int ns,
		fdt_size_t *sizep, bool translate)
{
	const fdt32_t *prop, *prop_end;
	const fdt32_t *prop_addr, *prop_size, *prop_after_size;
	int len;
	fdt_addr_t addr;

	debug("%s: %s: ", __func__, prop_name);

	if (na > (sizeof(fdt_addr_t) / sizeof(fdt32_t))) {
		debug("(na too large for fdt_addr_t type)\n");
		return FDT_ADDR_T_NONE;
	}

	if (ns > (sizeof(fdt_size_t) / sizeof(fdt32_t))) {
		debug("(ns too large for fdt_size_t type)\n");
		return FDT_ADDR_T_NONE;
	}

	prop = fdt_getprop(blob, node, prop_name, &len);
	if (!prop) {
		debug("(not found)\n");
		return FDT_ADDR_T_NONE;
	}
	prop_end = prop + (len / sizeof(*prop));

	prop_addr = prop + (index * (na + ns));
	prop_size = prop_addr + na;
	prop_after_size = prop_size + ns;
	if (prop_after_size > prop_end) {
		debug("(not enough data: expected >= %d cells, got %d cells)\n",
		      (u32)(prop_after_size - prop), ((u32)(prop_end - prop)));
		return FDT_ADDR_T_NONE;
	}

#if CONFIG_IS_ENABLED(OF_TRANSLATE)
	if (translate)
		addr = fdt_translate_address(blob, node, prop_addr);
	else
#endif
		addr = fdtdec_get_number(prop_addr, na);

	if (sizep) {
		*sizep = fdtdec_get_number(prop_size, ns);
		debug("addr=%08llx, size=%llx\n", (unsigned long long)addr,
		      (unsigned long long)*sizep);
	} else {
		debug("addr=%08llx\n", (unsigned long long)addr);
	}

	return addr;
}

fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
		int node, const char *prop_name, int index, fdt_size_t *sizep,
		bool translate)
{
	int na, ns;

	debug("%s: ", __func__);

	na = fdt_address_cells(blob, parent);
	if (na < 1) {
		debug("(bad #address-cells)\n");
		return FDT_ADDR_T_NONE;
	}

	ns = fdt_size_cells(blob, parent);
	if (ns < 0) {
		debug("(bad #size-cells)\n");
		return FDT_ADDR_T_NONE;
	}

	debug("na=%d, ns=%d, ", na, ns);

	return fdtdec_get_addr_size_fixed(blob, node, prop_name, index, na,
					  ns, sizep, translate);
}

fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
		const char *prop_name, int index, fdt_size_t *sizep,
		bool translate)
{
	int parent;

	debug("%s: ", __func__);

	parent = fdt_parent_offset(blob, node);
	if (parent < 0) {
		debug("(no parent found)\n");
		return FDT_ADDR_T_NONE;
	}

	return fdtdec_get_addr_size_auto_parent(blob, parent, node, prop_name,
						index, sizep, translate);
}

fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
		const char *prop_name, fdt_size_t *sizep)
{
	int ns = sizep ? (sizeof(fdt_size_t) / sizeof(fdt32_t)) : 0;

	return fdtdec_get_addr_size_fixed(blob, node, prop_name, 0,
					  sizeof(fdt_addr_t) / sizeof(fdt32_t),
					  ns, sizep, false);
}

fdt_addr_t fdtdec_get_addr(const void *blob, int node,
		const char *prop_name)
{
	return fdtdec_get_addr_size(blob, node, prop_name, NULL);
}

#if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
		const char *prop_name, struct fdt_pci_addr *addr)
{
	const u32 *cell;
	int len;
	int ret = -ENOENT;

	debug("%s: %s: ", __func__, prop_name);

	/*
	 * If we follow the pci bus bindings strictly, we should check
	 * the value of the node's parent node's #address-cells and
	 * #size-cells. They need to be 3 and 2 accordingly. However,
	 * for simplicity we skip the check here.
	 */
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (!cell)
		goto fail;

	if ((len % FDT_PCI_REG_SIZE) == 0) {
		int num = len / FDT_PCI_REG_SIZE;
		int i;

		for (i = 0; i < num; i++) {
			debug("pci address #%d: %08lx %08lx %08lx\n", i,
			      (ulong)fdt32_to_cpu(cell[0]),
			      (ulong)fdt32_to_cpu(cell[1]),
			      (ulong)fdt32_to_cpu(cell[2]));
			if ((fdt32_to_cpu(*cell) & type) == type) {
				addr->phys_hi = fdt32_to_cpu(cell[0]);
				addr->phys_mid = fdt32_to_cpu(cell[1]);
				addr->phys_lo = fdt32_to_cpu(cell[1]);
				break;
			} else {
				cell += (FDT_PCI_ADDR_CELLS +
					 FDT_PCI_SIZE_CELLS);
			}
		}

		if (i == num) {
			ret = -ENXIO;
			goto fail;
		}

		return 0;
	} else {
		ret = -EINVAL;
	}

fail:
	debug("(not found)\n");
	return ret;
}

int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device)
{
	const char *list, *end;
	int len;

	list = fdt_getprop(blob, node, "compatible", &len);
	if (!list)
		return -ENOENT;

	end = list + len;
	while (list < end) {
		char *s;

		len = strlen(list);
		if (len >= strlen("pciVVVV,DDDD")) {
			s = strstr(list, "pci");

			/*
			 * check if the string is something like pciVVVV,DDDD.RR
			 * or just pciVVVV,DDDD
			 */
			if (s && s[7] == ',' &&
			    (s[12] == '.' || s[12] == 0)) {
				s += 3;
				*vendor = simple_strtol(s, NULL, 16);

				s += 5;
				*device = simple_strtol(s, NULL, 16);

				return 0;
			}
		}
		list += (len + 1);
	}

	return -ENOENT;
}

int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
			 u32 *bar)
{
	int barnum;

	/* extract the bar number from fdt_pci_addr */
	barnum = addr->phys_hi & 0xff;
	if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS))
		return -EINVAL;

	barnum = (barnum - PCI_BASE_ADDRESS_0) / 4;
	*bar = dm_pci_read_bar32(dev, barnum);

	return 0;
}
#endif

uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
		uint64_t default_val)
{
	const uint64_t *cell64;
	int length;

	cell64 = fdt_getprop(blob, node, prop_name, &length);
	if (!cell64 || length < sizeof(*cell64))
		return default_val;

	return fdt64_to_cpu(*cell64);
}

int fdtdec_get_is_enabled(const void *blob, int node)
{
	const char *cell;

	/*
	 * It should say "okay", so only allow that. Some fdts use "ok" but
	 * this is a bug. Please fix your device tree source file. See here
	 * for discussion:
	 *
	 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
	 */
	cell = fdt_getprop(blob, node, "status", NULL);
	if (cell)
		return 0 == strcmp(cell, "okay");
	return 1;
}

enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
{
	enum fdt_compat_id id;

	/* Search our drivers */
	for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
		if (0 == fdt_node_check_compatible(blob, node,
				compat_names[id]))
			return id;
	return COMPAT_UNKNOWN;
}

int fdtdec_next_compatible(const void *blob, int node,
		enum fdt_compat_id id)
{
	return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
}

int fdtdec_next_compatible_subnode(const void *blob, int node,
		enum fdt_compat_id id, int *depthp)
{
	do {
		node = fdt_next_node(blob, node, depthp);
	} while (*depthp > 1);

	/* If this is a direct subnode, and compatible, return it */
	if (*depthp == 1 && 0 == fdt_node_check_compatible(
						blob, node, compat_names[id]))
		return node;

	return -FDT_ERR_NOTFOUND;
}

int fdtdec_next_alias(const void *blob, const char *name,
		enum fdt_compat_id id, int *upto)
{
#define MAX_STR_LEN 20
	char str[MAX_STR_LEN + 20];
	int node, err;

	/* snprintf() is not available */
	assert(strlen(name) < MAX_STR_LEN);
	sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
	node = fdt_path_offset(blob, str);
	if (node < 0)
		return node;
	err = fdt_node_check_compatible(blob, node, compat_names[id]);
	if (err < 0)
		return err;
	if (err)
		return -FDT_ERR_NOTFOUND;
	(*upto)++;
	return node;
}

int fdtdec_find_aliases_for_id(const void *blob, const char *name,
			enum fdt_compat_id id, int *node_list, int maxcount)
{
	memset(node_list, '\0', sizeof(*node_list) * maxcount);

	return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
}

/* TODO: Can we tighten this code up a little? */
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
			enum fdt_compat_id id, int *node_list, int maxcount)
{
	int name_len = strlen(name);
	int nodes[maxcount];
	int num_found = 0;
	int offset, node;
	int alias_node;
	int count;
	int i, j;

	/* find the alias node if present */
	alias_node = fdt_path_offset(blob, "/aliases");

	/*
	 * start with nothing, and we can assume that the root node can't
	 * match
	 */
	memset(nodes, '\0', sizeof(nodes));

	/* First find all the compatible nodes */
	for (node = count = 0; node >= 0 && count < maxcount;) {
		node = fdtdec_next_compatible(blob, node, id);
		if (node >= 0)
			nodes[count++] = node;
	}
	if (node >= 0)
		debug("%s: warning: maxcount exceeded with alias '%s'\n",
		       __func__, name);

	/* Now find all the aliases */
	for (offset = fdt_first_property_offset(blob, alias_node);
			offset > 0;
			offset = fdt_next_property_offset(blob, offset)) {
		const struct fdt_property *prop;
		const char *path;
		int number;
		int found;

		node = 0;
		prop = fdt_get_property_by_offset(blob, offset, NULL);
		path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
		if (prop->len && 0 == strncmp(path, name, name_len))
			node = fdt_path_offset(blob, prop->data);
		if (node <= 0)
			continue;

		/* Get the alias number */
		number = simple_strtoul(path + name_len, NULL, 10);
		if (number < 0 || number >= maxcount) {
			debug("%s: warning: alias '%s' is out of range\n",
			       __func__, path);
			continue;
		}

		/* Make sure the node we found is actually in our list! */
		found = -1;
		for (j = 0; j < count; j++)
			if (nodes[j] == node) {
				found = j;
				break;
			}

		if (found == -1) {
			debug("%s: warning: alias '%s' points to a node "
				"'%s' that is missing or is not compatible "
				" with '%s'\n", __func__, path,
				fdt_get_name(blob, node, NULL),
			       compat_names[id]);
			continue;
		}

		/*
		 * Add this node to our list in the right place, and mark
		 * it as done.
		 */
		if (fdtdec_get_is_enabled(blob, node)) {
			if (node_list[number]) {
				debug("%s: warning: alias '%s' requires that "
				      "a node be placed in the list in a "
				      "position which is already filled by "
				      "node '%s'\n", __func__, path,
				      fdt_get_name(blob, node, NULL));
				continue;
			}
			node_list[number] = node;
			if (number >= num_found)
				num_found = number + 1;
		}
		nodes[found] = 0;
	}

	/* Add any nodes not mentioned by an alias */
	for (i = j = 0; i < maxcount; i++) {
		if (!node_list[i]) {
			for (; j < maxcount; j++)
				if (nodes[j] &&
					fdtdec_get_is_enabled(blob, nodes[j]))
					break;

			/* Have we run out of nodes to add? */
			if (j == maxcount)
				break;

			assert(!node_list[i]);
			node_list[i] = nodes[j++];
			if (i >= num_found)
				num_found = i + 1;
		}
	}

	return num_found;
}

int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
			 int *seqp)
{
	int base_len = strlen(base);
	const char *find_name;
	int find_namelen;
	int prop_offset;
	int aliases;

	find_name = fdt_get_name(blob, offset, &find_namelen);
	debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);

	aliases = fdt_path_offset(blob, "/aliases");
	for (prop_offset = fdt_first_property_offset(blob, aliases);
	     prop_offset > 0;
	     prop_offset = fdt_next_property_offset(blob, prop_offset)) {
		const char *prop;
		const char *name;
		const char *slash;
		int len, val;

		prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
		debug("   - %s, %s\n", name, prop);
		if (len < find_namelen || *prop != '/' || prop[len - 1] ||
		    strncmp(name, base, base_len))
			continue;

		slash = strrchr(prop, '/');
		if (strcmp(slash + 1, find_name))
			continue;
		val = trailing_strtol(name);
		if (val != -1) {
			*seqp = val;
			debug("Found seq %d\n", *seqp);
			return 0;
		}
	}

	debug("Not found\n");
	return -ENOENT;
}

const char *fdtdec_get_chosen_prop(const void *blob, const char *name)
{
	int chosen_node;

	if (!blob)
		return NULL;
	chosen_node = fdt_path_offset(blob, "/chosen");
	return fdt_getprop(blob, chosen_node, name, NULL);
}

int fdtdec_get_chosen_node(const void *blob, const char *name)
{
	const char *prop;

	prop = fdtdec_get_chosen_prop(blob, name);
	if (!prop)
		return -FDT_ERR_NOTFOUND;
	return fdt_path_offset(blob, prop);
}

int fdtdec_check_fdt(void)
{
	/*
	 * We must have an FDT, but we cannot panic() yet since the console
	 * is not ready. So for now, just assert(). Boards which need an early
	 * FDT (prior to console ready) will need to make their own
	 * arrangements and do their own checks.
	 */
	assert(!fdtdec_prepare_fdt());
	return 0;
}

/*
 * This function is a little odd in that it accesses global data. At some
 * point if the architecture board.c files merge this will make more sense.
 * Even now, it is common code.
 */
int fdtdec_prepare_fdt(void)
{
	if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
	    fdt_check_header(gd->fdt_blob)) {
#ifdef CONFIG_SPL_BUILD
		puts("Missing DTB\n");
#else
		puts("No valid device tree binary found - please append one to U-Boot binary, use u-boot-dtb.bin or define CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
# ifdef DEBUG
		if (gd->fdt_blob) {
			printf("fdt_blob=%p\n", gd->fdt_blob);
			print_buffer((ulong)gd->fdt_blob, gd->fdt_blob, 4,
				     32, 0);
		}
# endif
#endif
		return -1;
	}
	return 0;
}

int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
{
	const u32 *phandle;
	int lookup;

	debug("%s: %s\n", __func__, prop_name);
	phandle = fdt_getprop(blob, node, prop_name, NULL);
	if (!phandle)
		return -FDT_ERR_NOTFOUND;

	lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
	return lookup;
}

/**
 * Look up a property in a node and check that it has a minimum length.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param min_len	minimum property length in bytes
 * @param err		0 if ok, or -FDT_ERR_NOTFOUND if the property is not
			found, or -FDT_ERR_BADLAYOUT if not enough data
 * @return pointer to cell, which is only valid if err == 0
 */
static const void *get_prop_check_min_len(const void *blob, int node,
		const char *prop_name, int min_len, int *err)
{
	const void *cell;
	int len;

	debug("%s: %s\n", __func__, prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (!cell)
		*err = -FDT_ERR_NOTFOUND;
	else if (len < min_len)
		*err = -FDT_ERR_BADLAYOUT;
	else
		*err = 0;
	return cell;
}

int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
		u32 *array, int count)
{
	const u32 *cell;
	int i, err = 0;

	debug("%s: %s\n", __func__, prop_name);
	cell = get_prop_check_min_len(blob, node, prop_name,
				      sizeof(u32) * count, &err);
	if (!err) {
		for (i = 0; i < count; i++)
			array[i] = fdt32_to_cpu(cell[i]);
	}
	return err;
}

int fdtdec_get_int_array_count(const void *blob, int node,
			       const char *prop_name, u32 *array, int count)
{
	const u32 *cell;
	int len, elems;
	int i;

	debug("%s: %s\n", __func__, prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (!cell)
		return -FDT_ERR_NOTFOUND;
	elems = len / sizeof(u32);
	if (count > elems)
		count = elems;
	for (i = 0; i < count; i++)
		array[i] = fdt32_to_cpu(cell[i]);

	return count;
}

const u32 *fdtdec_locate_array(const void *blob, int node,
			       const char *prop_name, int count)
{
	const u32 *cell;
	int err;

	cell = get_prop_check_min_len(blob, node, prop_name,
				      sizeof(u32) * count, &err);
	return err ? NULL : cell;
}

int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
{
	const s32 *cell;
	int len;

	debug("%s: %s\n", __func__, prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	return cell != NULL;
}

int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
				   const char *list_name,
				   const char *cells_name,
				   int cell_count, int index,
				   struct fdtdec_phandle_args *out_args)
{
	const __be32 *list, *list_end;
	int rc = 0, size, cur_index = 0;
	uint32_t count = 0;
	int node = -1;
	int phandle;

	/* Retrieve the phandle list property */
	list = fdt_getprop(blob, src_node, list_name, &size);
	if (!list)
		return -ENOENT;
	list_end = list + size / sizeof(*list);

	/* Loop over the phandles until all the requested entry is found */
	while (list < list_end) {
		rc = -EINVAL;
		count = 0;

		/*
		 * If phandle is 0, then it is an empty entry with no
		 * arguments.  Skip forward to the next entry.
		 */
		phandle = be32_to_cpup(list++);
		if (phandle) {
			/*
			 * Find the provider node and parse the #*-cells
			 * property to determine the argument length.
			 *
			 * This is not needed if the cell count is hard-coded
			 * (i.e. cells_name not set, but cell_count is set),
			 * except when we're going to return the found node
			 * below.
			 */
			if (cells_name || cur_index == index) {
				node = fdt_node_offset_by_phandle(blob,
								  phandle);
				if (!node) {
					debug("%s: could not find phandle\n",
					      fdt_get_name(blob, src_node,
							   NULL));
					goto err;
				}
			}

			if (cells_name) {
				count = fdtdec_get_int(blob, node, cells_name,
						       -1);
				if (count == -1) {
					debug("%s: could not get %s for %s\n",
					      fdt_get_name(blob, src_node,
							   NULL),
					      cells_name,
					      fdt_get_name(blob, node,
							   NULL));
					goto err;
				}
			} else {
				count = cell_count;
			}

			/*
			 * Make sure that the arguments actually fit in the
			 * remaining property data length
			 */
			if (list + count > list_end) {
				debug("%s: arguments longer than property\n",
				      fdt_get_name(blob, src_node, NULL));
				goto err;
			}
		}

		/*
		 * All of the error cases above bail out of the loop, so at
		 * this point, the parsing is successful. If the requested
		 * index matches, then fill the out_args structure and return,
		 * or return -ENOENT for an empty entry.
		 */
		rc = -ENOENT;
		if (cur_index == index) {
			if (!phandle)
				goto err;

			if (out_args) {
				int i;

				if (count > MAX_PHANDLE_ARGS) {
					debug("%s: too many arguments %d\n",
					      fdt_get_name(blob, src_node,
							   NULL), count);
					count = MAX_PHANDLE_ARGS;
				}
				out_args->node = node;
				out_args->args_count = count;
				for (i = 0; i < count; i++) {
					out_args->args[i] =
							be32_to_cpup(list++);
				}
			}

			/* Found it! return success */
			return 0;
		}

		node = -1;
		list += count;
		cur_index++;
	}

	/*
	 * Result will be one of:
	 * -ENOENT : index is for empty phandle
	 * -EINVAL : parsing error on data
	 * [1..n]  : Number of phandle (count mode; when index = -1)
	 */
	rc = index < 0 ? cur_index : -ENOENT;
 err:
	return rc;
}

int fdtdec_get_child_count(const void *blob, int node)
{
	int subnode;
	int num = 0;

	fdt_for_each_subnode(subnode, blob, node)
		num++;

	return num;
}

int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
		u8 *array, int count)
{
	const u8 *cell;
	int err;

	cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
	if (!err)
		memcpy(array, cell, count);
	return err;
}

const u8 *fdtdec_locate_byte_array(const void *blob, int node,
			     const char *prop_name, int count)
{
	const u8 *cell;
	int err;

	cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
	if (err)
		return NULL;
	return cell;
}

int fdtdec_get_config_int(const void *blob, const char *prop_name,
		int default_val)
{
	int config_node;

	debug("%s: %s\n", __func__, prop_name);
	config_node = fdt_path_offset(blob, "/config");
	if (config_node < 0)
		return default_val;
	return fdtdec_get_int(blob, config_node, prop_name, default_val);
}

int fdtdec_get_config_bool(const void *blob, const char *prop_name)
{
	int config_node;
	const void *prop;

	debug("%s: %s\n", __func__, prop_name);
	config_node = fdt_path_offset(blob, "/config");
	if (config_node < 0)
		return 0;
	prop = fdt_get_property(blob, config_node, prop_name, NULL);

	return prop != NULL;
}

char *fdtdec_get_config_string(const void *blob, const char *prop_name)
{
	const char *nodep;
	int nodeoffset;
	int len;

	debug("%s: %s\n", __func__, prop_name);
	nodeoffset = fdt_path_offset(blob, "/config");
	if (nodeoffset < 0)
		return NULL;

	nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
	if (!nodep)
		return NULL;

	return (char *)nodep;
}

int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
			 fdt_addr_t *basep, fdt_size_t *sizep)
{
	const fdt_addr_t *cell;
	int len;

	debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL),
	      prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
		debug("cell=%p, len=%d\n", cell, len);
		return -1;
	}

	*basep = fdt_addr_to_cpu(*cell);
	*sizep = fdt_size_to_cpu(cell[1]);
	debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
	      (ulong)*sizep);

	return 0;
}

/**
 * Read a flash entry from the fdt
 *
 * @param blob		FDT blob
 * @param node		Offset of node to read
 * @param name		Name of node being read
 * @param entry		Place to put offset and size of this node
 * @return 0 if ok, -ve on error
 */
int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
			   struct fmap_entry *entry)
{
	const char *prop;
	u32 reg[2];

	if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
		debug("Node '%s' has bad/missing 'reg' property\n", name);
		return -FDT_ERR_NOTFOUND;
	}
	entry->offset = reg[0];
	entry->length = reg[1];
	entry->used = fdtdec_get_int(blob, node, "used", entry->length);
	prop = fdt_getprop(blob, node, "compress", NULL);
	entry->compress_algo = prop && !strcmp(prop, "lzo") ?
		FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE;
	prop = fdt_getprop(blob, node, "hash", &entry->hash_size);
	entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
	entry->hash = (uint8_t *)prop;

	return 0;
}

u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
{
	u64 number = 0;

	while (cells--)
		number = (number << 32) | fdt32_to_cpu(*ptr++);

	return number;
}

int fdt_get_resource(const void *fdt, int node, const char *property,
		     unsigned int index, struct fdt_resource *res)
{
	const fdt32_t *ptr, *end;
	int na, ns, len, parent;
	unsigned int i = 0;

	parent = fdt_parent_offset(fdt, node);
	if (parent < 0)
		return parent;

	na = fdt_address_cells(fdt, parent);
	ns = fdt_size_cells(fdt, parent);

	ptr = fdt_getprop(fdt, node, property, &len);
	if (!ptr)
		return len;

	end = ptr + len / sizeof(*ptr);

	while (ptr + na + ns <= end) {
		if (i == index) {
			res->start = res->end = fdtdec_get_number(ptr, na);
			res->end += fdtdec_get_number(&ptr[na], ns) - 1;
			return 0;
		}

		ptr += na + ns;
		i++;
	}

	return -FDT_ERR_NOTFOUND;
}

int fdt_get_named_resource(const void *fdt, int node, const char *property,
			   const char *prop_names, const char *name,
			   struct fdt_resource *res)
{
	int index;

	index = fdt_stringlist_search(fdt, node, prop_names, name);
	if (index < 0)
		return index;

	return fdt_get_resource(fdt, node, property, index, res);
}

int fdtdec_decode_memory_region(const void *blob, int config_node,
				const char *mem_type, const char *suffix,
				fdt_addr_t *basep, fdt_size_t *sizep)
{
	char prop_name[50];
	const char *mem;
	fdt_size_t size, offset_size;
	fdt_addr_t base, offset;
	int node;

	if (config_node == -1) {
		config_node = fdt_path_offset(blob, "/config");
		if (config_node < 0) {
			debug("%s: Cannot find /config node\n", __func__);
			return -ENOENT;
		}
	}
	if (!suffix)
		suffix = "";

	snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
		 suffix);
	mem = fdt_getprop(blob, config_node, prop_name, NULL);
	if (!mem) {
		debug("%s: No memory type for '%s', using /memory\n", __func__,
		      prop_name);
		mem = "/memory";
	}

	node = fdt_path_offset(blob, mem);
	if (node < 0) {
		debug("%s: Failed to find node '%s': %s\n", __func__, mem,
		      fdt_strerror(node));
		return -ENOENT;
	}

	/*
	 * Not strictly correct - the memory may have multiple banks. We just
	 * use the first
	 */
	if (fdtdec_decode_region(blob, node, "reg", &base, &size)) {
		debug("%s: Failed to decode memory region %s\n", __func__,
		      mem);
		return -EINVAL;
	}

	snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
		 suffix);
	if (fdtdec_decode_region(blob, config_node, prop_name, &offset,
				 &offset_size)) {
		debug("%s: Failed to decode memory region '%s'\n", __func__,
		      prop_name);
		return -EINVAL;
	}

	*basep = base + offset;
	*sizep = offset_size;

	return 0;
}

static int decode_timing_property(const void *blob, int node, const char *name,
				  struct timing_entry *result)
{
	int length, ret = 0;
	const u32 *prop;

	prop = fdt_getprop(blob, node, name, &length);
	if (!prop) {
		debug("%s: could not find property %s\n",
		      fdt_get_name(blob, node, NULL), name);
		return length;
	}

	if (length == sizeof(u32)) {
		result->typ = fdtdec_get_int(blob, node, name, 0);
		result->min = result->typ;
		result->max = result->typ;
	} else {
		ret = fdtdec_get_int_array(blob, node, name, &result->min, 3);
	}

	return ret;
}

int fdtdec_decode_display_timing(const void *blob, int parent, int index,
				 struct display_timing *dt)
{
	int i, node, timings_node;
	u32 val = 0;
	int ret = 0;

	timings_node = fdt_subnode_offset(blob, parent, "display-timings");
	if (timings_node < 0)
		return timings_node;

	for (i = 0, node = fdt_first_subnode(blob, timings_node);
	     node > 0 && i != index;
	     node = fdt_next_subnode(blob, node))
		i++;

	if (node < 0)
		return node;

	memset(dt, 0, sizeof(*dt));

	ret |= decode_timing_property(blob, node, "hback-porch",
				      &dt->hback_porch);
	ret |= decode_timing_property(blob, node, "hfront-porch",
				      &dt->hfront_porch);
	ret |= decode_timing_property(blob, node, "hactive", &dt->hactive);
	ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len);
	ret |= decode_timing_property(blob, node, "vback-porch",
				      &dt->vback_porch);
	ret |= decode_timing_property(blob, node, "vfront-porch",
				      &dt->vfront_porch);
	ret |= decode_timing_property(blob, node, "vactive", &dt->vactive);
	ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len);
	ret |= decode_timing_property(blob, node, "clock-frequency",
				      &dt->pixelclock);

	dt->flags = 0;
	val = fdtdec_get_int(blob, node, "vsync-active", -1);
	if (val != -1) {
		dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
				DISPLAY_FLAGS_VSYNC_LOW;
	}
	val = fdtdec_get_int(blob, node, "hsync-active", -1);
	if (val != -1) {
		dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
				DISPLAY_FLAGS_HSYNC_LOW;
	}
	val = fdtdec_get_int(blob, node, "de-active", -1);
	if (val != -1) {
		dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
				DISPLAY_FLAGS_DE_LOW;
	}
	val = fdtdec_get_int(blob, node, "pixelclk-active", -1);
	if (val != -1) {
		dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
				DISPLAY_FLAGS_PIXDATA_NEGEDGE;
	}

	if (fdtdec_get_bool(blob, node, "interlaced"))
		dt->flags |= DISPLAY_FLAGS_INTERLACED;
	if (fdtdec_get_bool(blob, node, "doublescan"))
		dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
	if (fdtdec_get_bool(blob, node, "doubleclk"))
		dt->flags |= DISPLAY_FLAGS_DOUBLECLK;

	return ret;
}

int fdtdec_setup_memory_size(void)
{
	int ret, mem;
	struct fdt_resource res;

	mem = fdt_path_offset(gd->fdt_blob, "/memory");
	if (mem < 0) {
		debug("%s: Missing /memory node\n", __func__);
		return -EINVAL;
	}

	ret = fdt_get_resource(gd->fdt_blob, mem, "reg", 0, &res);
	if (ret != 0) {
		debug("%s: Unable to decode first memory bank\n", __func__);
		return -EINVAL;
	}

	gd->ram_size = (phys_size_t)(res.end - res.start + 1);
	debug("%s: Initial DRAM size %llx\n", __func__, (u64)gd->ram_size);

	return 0;
}

#if defined(CONFIG_NR_DRAM_BANKS)
int fdtdec_setup_memory_banksize(void)
{
	int bank, ret, mem;
	struct fdt_resource res;

	mem = fdt_path_offset(gd->fdt_blob, "/memory");
	if (mem < 0) {
		debug("%s: Missing /memory node\n", __func__);
		return -EINVAL;
	}

	for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
		ret = fdt_get_resource(gd->fdt_blob, mem, "reg", bank, &res);
		if (ret == -FDT_ERR_NOTFOUND)
			break;
		if (ret != 0)
			return -EINVAL;

		gd->bd->bi_dram[bank].start = (phys_addr_t)res.start;
		gd->bd->bi_dram[bank].size =
			(phys_size_t)(res.end - res.start + 1);

		debug("%s: DRAM Bank #%d: start = 0x%llx, size = 0x%llx\n",
		      __func__, bank,
		      (unsigned long long)gd->bd->bi_dram[bank].start,
		      (unsigned long long)gd->bd->bi_dram[bank].size);
	}

	return 0;
}
#endif

int fdtdec_setup(void)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)
# ifdef CONFIG_OF_EMBED
	/* Get a pointer to the FDT */
	gd->fdt_blob = __dtb_dt_begin;
# elif defined CONFIG_OF_SEPARATE
#  ifdef CONFIG_SPL_BUILD
	/* FDT is at end of BSS unless it is in a different memory region */
	if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
		gd->fdt_blob = (ulong *)&_image_binary_end;
	else
		gd->fdt_blob = (ulong *)&__bss_end;
#  else
	/* FDT is at end of image */
	gd->fdt_blob = (ulong *)&_end;
#  endif
# elif defined(CONFIG_OF_HOSTFILE)
	if (sandbox_read_fdt_from_file()) {
		puts("Failed to read control FDT\n");
		return -1;
	}
# endif
# ifndef CONFIG_SPL_BUILD
	/* Allow the early environment to override the fdt address */
	gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
						(uintptr_t)gd->fdt_blob);
# endif
#endif
	return fdtdec_prepare_fdt();
}

#endif /* !USE_HOSTCC */