lib/fdtdec.c

   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 <dm.h>
   9 #include <errno.h>
  10 #include <serial.h>
  11 #include <libfdt.h>
  12 #include <fdtdec.h>
  13 #include <asm/sections.h>
  14 #include <linux/ctype.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_EMC, "nvidia,tegra20-emc"),
  27         COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
  28         COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
  29         COMPAT(NVIDIA_TEGRA124_PMC, "nvidia,tegra124-pmc"),
  30         COMPAT(NVIDIA_TEGRA186_SDMMC, "nvidia,tegra186-sdhci"),
  31         COMPAT(NVIDIA_TEGRA210_SDMMC, "nvidia,tegra210-sdhci"),
  32         COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
  33         COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
  34         COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
  35         COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
  36         COMPAT(NVIDIA_TEGRA210_XUSB_PADCTL, "nvidia,tegra210-xusb-padctl"),
  37         COMPAT(SMSC_LAN9215, "smsc,lan9215"),
  38         COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
  39         COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
  40         COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
  41         COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
  42         COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
  43         COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
  44         COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
  45         COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
  46         COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
  47         COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
  48         COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
  49         COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
  50         COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
  51         COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686"),
  52         COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
  53         COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
  54         COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
  55         COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
  56         COMPAT(INTEL_MICROCODE, "intel,microcode"),
  57         COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"),
  58         COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"),
  59         COMPAT(INTEL_GMA, "intel,gma"),
  60         COMPAT(AMS_AS3722, "ams,as3722"),
  61         COMPAT(INTEL_ICH_SPI, "intel,ich-spi"),
  62         COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
  63         COMPAT(SOCIONEXT_XHCI, "socionext,uniphier-xhci"),
  64         COMPAT(COMPAT_INTEL_PCH, "intel,bd82x6x"),
  65         COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"),
  66         COMPAT(ALTERA_SOCFPGA_DWMMC, "altr,socfpga-dw-mshc"),
  67         COMPAT(ALTERA_SOCFPGA_DWC2USB, "snps,dwc2"),
  68         COMPAT(COMPAT_INTEL_BAYTRAIL_FSP, "intel,baytrail-fsp"),
  69         COMPAT(COMPAT_INTEL_BAYTRAIL_FSP_MDP, "intel,baytrail-fsp-mdp"),
  70         COMPAT(COMPAT_INTEL_IVYBRIDGE_FSP, "intel,ivybridge-fsp"),
  71 };
  72
  73 const char *fdtdec_get_compatible(enum fdt_compat_id id)
  74 {
  75         /* We allow reading of the 'unknown' ID for testing purposes */
  76         assert(id >= 0 && id < COMPAT_COUNT);
  77         return compat_names[id];
  78 }
  79
  80 fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
  81                 const char *prop_name, int index, int na, int ns,
  82                 fdt_size_t *sizep)
  83 {
  84         const fdt32_t *prop, *prop_end;
  85         const fdt32_t *prop_addr, *prop_size, *prop_after_size;
  86         int len;
  87         fdt_addr_t addr;
  88
  89         debug("%s: %s: ", __func__, prop_name);
  90
  91         if (na > (sizeof(fdt_addr_t) / sizeof(fdt32_t))) {
  92                 debug("(na too large for fdt_addr_t type)\n");
  93                 return FDT_ADDR_T_NONE;
  94         }
  95
  96         if (ns > (sizeof(fdt_size_t) / sizeof(fdt32_t))) {
  97                 debug("(ns too large for fdt_size_t type)\n");
  98                 return FDT_ADDR_T_NONE;
  99         }
 100
 101         prop = fdt_getprop(blob, node, prop_name, &len);
 102         if (!prop) {
 103                 debug("(not found)\n");
 104                 return FDT_ADDR_T_NONE;
 105         }
 106         prop_end = prop + (len / sizeof(*prop));
 107
 108         prop_addr = prop + (index * (na + ns));
 109         prop_size = prop_addr + na;
 110         prop_after_size = prop_size + ns;
 111         if (prop_after_size > prop_end) {
 112                 debug("(not enough data: expected >= %d cells, got %d cells)\n",
 113                       (u32)(prop_after_size - prop), ((u32)(prop_end - prop)));
 114                 return FDT_ADDR_T_NONE;
 115         }
 116
 117         addr = fdtdec_get_number(prop_addr, na);
 118
 119         if (sizep) {
 120                 *sizep = fdtdec_get_number(prop_size, ns);
 121                 debug("addr=%08llx, size=%llx\n", (unsigned long long)addr,
 122                       (unsigned long long)*sizep);
 123         } else {
 124                 debug("addr=%08llx\n", (unsigned long long)addr);
 125         }
 126
 127         return addr;
 128 }
 129
 130 fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
 131                 int node, const char *prop_name, int index, fdt_size_t *sizep)
 132 {
 133         int na, ns;
 134
 135         debug("%s: ", __func__);
 136
 137         na = fdt_address_cells(blob, parent);
 138         if (na < 1) {
 139                 debug("(bad #address-cells)\n");
 140                 return FDT_ADDR_T_NONE;
 141         }
 142
 143         ns = fdt_size_cells(blob, parent);
 144         if (ns < 0) {
 145                 debug("(bad #size-cells)\n");
 146                 return FDT_ADDR_T_NONE;
 147         }
 148
 149         debug("na=%d, ns=%d, ", na, ns);
 150
 151         return fdtdec_get_addr_size_fixed(blob, node, prop_name, index, na,
 152                                           ns, sizep);
 153 }
 154
 155 fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
 156                 const char *prop_name, int index, fdt_size_t *sizep)
 157 {
 158         int parent;
 159
 160         debug("%s: ", __func__);
 161
 162         parent = fdt_parent_offset(blob, node);
 163         if (parent < 0) {
 164                 debug("(no parent found)\n");
 165                 return FDT_ADDR_T_NONE;
 166         }
 167
 168         return fdtdec_get_addr_size_auto_parent(blob, parent, node, prop_name,
 169                                                 index, sizep);
 170 }
 171
 172 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
 173                 const char *prop_name, fdt_size_t *sizep)
 174 {
 175         int ns = sizep ? (sizeof(fdt_size_t) / sizeof(fdt32_t)) : 0;
 176
 177         return fdtdec_get_addr_size_fixed(blob, node, prop_name, 0,
 178                                           sizeof(fdt_addr_t) / sizeof(fdt32_t),
 179                                           ns, sizep);
 180 }
 181
 182 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
 183                 const char *prop_name)
 184 {
 185         return fdtdec_get_addr_size(blob, node, prop_name, NULL);
 186 }
 187
 188 #if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
 189 int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
 190                 const char *prop_name, struct fdt_pci_addr *addr)
 191 {
 192         const u32 *cell;
 193         int len;
 194         int ret = -ENOENT;
 195
 196         debug("%s: %s: ", __func__, prop_name);
 197
 198         /*
 199          * If we follow the pci bus bindings strictly, we should check
 200          * the value of the node's parent node's #address-cells and
 201          * #size-cells. They need to be 3 and 2 accordingly. However,
 202          * for simplicity we skip the check here.
 203          */
 204         cell = fdt_getprop(blob, node, prop_name, &len);
 205         if (!cell)
 206                 goto fail;
 207
 208         if ((len % FDT_PCI_REG_SIZE) == 0) {
 209                 int num = len / FDT_PCI_REG_SIZE;
 210                 int i;
 211
 212                 for (i = 0; i < num; i++) {
 213                         debug("pci address #%d: %08lx %08lx %08lx\n", i,
 214                               (ulong)fdt32_to_cpu(cell[0]),
 215                               (ulong)fdt32_to_cpu(cell[1]),
 216                               (ulong)fdt32_to_cpu(cell[2]));
 217                         if ((fdt32_to_cpu(*cell) & type) == type) {
 218                                 addr->phys_hi = fdt32_to_cpu(cell[0]);
 219                                 addr->phys_mid = fdt32_to_cpu(cell[1]);
 220                                 addr->phys_lo = fdt32_to_cpu(cell[1]);
 221                                 break;
 222                         } else {
 223                                 cell += (FDT_PCI_ADDR_CELLS +
 224                                          FDT_PCI_SIZE_CELLS);
 225                         }
 226                 }
 227
 228                 if (i == num) {
 229                         ret = -ENXIO;
 230                         goto fail;
 231                 }
 232
 233                 return 0;
 234         } else {
 235                 ret = -EINVAL;
 236         }
 237
 238 fail:
 239         debug("(not found)\n");
 240         return ret;
 241 }
 242
 243 int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device)
 244 {
 245         const char *list, *end;
 246         int len;
 247
 248         list = fdt_getprop(blob, node, "compatible", &len);
 249         if (!list)
 250                 return -ENOENT;
 251
 252         end = list + len;
 253         while (list < end) {
 254                 char *s;
 255
 256                 len = strlen(list);
 257                 if (len >= strlen("pciVVVV,DDDD")) {
 258                         s = strstr(list, "pci");
 259
 260                         /*
 261                          * check if the string is something like pciVVVV,DDDD.RR
 262                          * or just pciVVVV,DDDD
 263                          */
 264                         if (s && s[7] == ',' &&
 265                             (s[12] == '.' || s[12] == 0)) {
 266                                 s += 3;
 267                                 *vendor = simple_strtol(s, NULL, 16);
 268
 269                                 s += 5;
 270                                 *device = simple_strtol(s, NULL, 16);
 271
 272                                 return 0;
 273                         }
 274                 }
 275                 list += (len + 1);
 276         }
 277
 278         return -ENOENT;
 279 }
 280
 281 int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
 282                          u32 *bar)
 283 {
 284         int barnum;
 285
 286         /* extract the bar number from fdt_pci_addr */
 287         barnum = addr->phys_hi & 0xff;
 288         if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS))
 289                 return -EINVAL;
 290
 291         barnum = (barnum - PCI_BASE_ADDRESS_0) / 4;
 292         *bar = dm_pci_read_bar32(dev, barnum);
 293
 294         return 0;
 295 }
 296 #endif
 297
 298 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
 299                 uint64_t default_val)
 300 {
 301         const uint64_t *cell64;
 302         int length;
 303
 304         cell64 = fdt_getprop(blob, node, prop_name, &length);
 305         if (!cell64 || length < sizeof(*cell64))
 306                 return default_val;
 307
 308         return fdt64_to_cpu(*cell64);
 309 }
 310
 311 int fdtdec_get_is_enabled(const void *blob, int node)
 312 {
 313         const char *cell;
 314
 315         /*
 316          * It should say "okay", so only allow that. Some fdts use "ok" but
 317          * this is a bug. Please fix your device tree source file. See here
 318          * for discussion:
 319          *
 320          * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
 321          */
 322         cell = fdt_getprop(blob, node, "status", NULL);
 323         if (cell)
 324                 return 0 == strcmp(cell, "okay");
 325         return 1;
 326 }
 327
 328 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 329 {
 330         enum fdt_compat_id id;
 331
 332         /* Search our drivers */
 333         for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
 334                 if (0 == fdt_node_check_compatible(blob, node,
 335                                 compat_names[id]))
 336                         return id;
 337         return COMPAT_UNKNOWN;
 338 }
 339
 340 int fdtdec_next_compatible(const void *blob, int node,
 341                 enum fdt_compat_id id)
 342 {
 343         return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
 344 }
 345
 346 int fdtdec_next_compatible_subnode(const void *blob, int node,
 347                 enum fdt_compat_id id, int *depthp)
 348 {
 349         do {
 350                 node = fdt_next_node(blob, node, depthp);
 351         } while (*depthp > 1);
 352
 353         /* If this is a direct subnode, and compatible, return it */
 354         if (*depthp == 1 && 0 == fdt_node_check_compatible(
 355                                                 blob, node, compat_names[id]))
 356                 return node;
 357
 358         return -FDT_ERR_NOTFOUND;
 359 }
 360
 361 int fdtdec_next_alias(const void *blob, const char *name,
 362                 enum fdt_compat_id id, int *upto)
 363 {
 364 #define MAX_STR_LEN 20
 365         char str[MAX_STR_LEN + 20];
 366         int node, err;
 367
 368         /* snprintf() is not available */
 369         assert(strlen(name) < MAX_STR_LEN);
 370         sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
 371         node = fdt_path_offset(blob, str);
 372         if (node < 0)
 373                 return node;
 374         err = fdt_node_check_compatible(blob, node, compat_names[id]);
 375         if (err < 0)
 376                 return err;
 377         if (err)
 378                 return -FDT_ERR_NOTFOUND;
 379         (*upto)++;
 380         return node;
 381 }
 382
 383 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
 384                         enum fdt_compat_id id, int *node_list, int maxcount)
 385 {
 386         memset(node_list, '\0', sizeof(*node_list) * maxcount);
 387
 388         return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
 389 }
 390
 391 /* TODO: Can we tighten this code up a little? */
 392 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
 393                         enum fdt_compat_id id, int *node_list, int maxcount)
 394 {
 395         int name_len = strlen(name);
 396         int nodes[maxcount];
 397         int num_found = 0;
 398         int offset, node;
 399         int alias_node;
 400         int count;
 401         int i, j;
 402
 403         /* find the alias node if present */
 404         alias_node = fdt_path_offset(blob, "/aliases");
 405
 406         /*
 407          * start with nothing, and we can assume that the root node can't
 408          * match
 409          */
 410         memset(nodes, '\0', sizeof(nodes));
 411
 412         /* First find all the compatible nodes */
 413         for (node = count = 0; node >= 0 && count < maxcount;) {
 414                 node = fdtdec_next_compatible(blob, node, id);
 415                 if (node >= 0)
 416                         nodes[count++] = node;
 417         }
 418         if (node >= 0)
 419                 debug("%s: warning: maxcount exceeded with alias '%s'\n",
 420                        __func__, name);
 421
 422         /* Now find all the aliases */
 423         for (offset = fdt_first_property_offset(blob, alias_node);
 424                         offset > 0;
 425                         offset = fdt_next_property_offset(blob, offset)) {
 426                 const struct fdt_property *prop;
 427                 const char *path;
 428                 int number;
 429                 int found;
 430
 431                 node = 0;
 432                 prop = fdt_get_property_by_offset(blob, offset, NULL);
 433                 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 434                 if (prop->len && 0 == strncmp(path, name, name_len))
 435                         node = fdt_path_offset(blob, prop->data);
 436                 if (node <= 0)
 437                         continue;
 438
 439                 /* Get the alias number */
 440                 number = simple_strtoul(path + name_len, NULL, 10);
 441                 if (number < 0 || number >= maxcount) {
 442                         debug("%s: warning: alias '%s' is out of range\n",
 443                                __func__, path);
 444                         continue;
 445                 }
 446
 447                 /* Make sure the node we found is actually in our list! */
 448                 found = -1;
 449                 for (j = 0; j < count; j++)
 450                         if (nodes[j] == node) {
 451                                 found = j;
 452                                 break;
 453                         }
 454
 455                 if (found == -1) {
 456                         debug("%s: warning: alias '%s' points to a node "
 457                                 "'%s' that is missing or is not compatible "
 458                                 " with '%s'\n", __func__, path,
 459                                 fdt_get_name(blob, node, NULL),
 460                                compat_names[id]);
 461                         continue;
 462                 }
 463
 464                 /*
 465                  * Add this node to our list in the right place, and mark
 466                  * it as done.
 467                  */
 468                 if (fdtdec_get_is_enabled(blob, node)) {
 469                         if (node_list[number]) {
 470                                 debug("%s: warning: alias '%s' requires that "
 471                                       "a node be placed in the list in a "
 472                                       "position which is already filled by "
 473                                       "node '%s'\n", __func__, path,
 474                                       fdt_get_name(blob, node, NULL));
 475                                 continue;
 476                         }
 477                         node_list[number] = node;
 478                         if (number >= num_found)
 479                                 num_found = number + 1;
 480                 }
 481                 nodes[found] = 0;
 482         }
 483
 484         /* Add any nodes not mentioned by an alias */
 485         for (i = j = 0; i < maxcount; i++) {
 486                 if (!node_list[i]) {
 487                         for (; j < maxcount; j++)
 488                                 if (nodes[j] &&
 489                                         fdtdec_get_is_enabled(blob, nodes[j]))
 490                                         break;
 491
 492                         /* Have we run out of nodes to add? */
 493                         if (j == maxcount)
 494                                 break;
 495
 496                         assert(!node_list[i]);
 497                         node_list[i] = nodes[j++];
 498                         if (i >= num_found)
 499                                 num_found = i + 1;
 500                 }
 501         }
 502
 503         return num_found;
 504 }
 505
 506 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
 507                          int *seqp)
 508 {
 509         int base_len = strlen(base);
 510         const char *find_name;
 511         int find_namelen;
 512         int prop_offset;
 513         int aliases;
 514
 515         find_name = fdt_get_name(blob, offset, &find_namelen);
 516         debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
 517
 518         aliases = fdt_path_offset(blob, "/aliases");
 519         for (prop_offset = fdt_first_property_offset(blob, aliases);
 520              prop_offset > 0;
 521              prop_offset = fdt_next_property_offset(blob, prop_offset)) {
 522                 const char *prop;
 523                 const char *name;
 524                 const char *slash;
 525                 int len, val;
 526
 527                 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
 528                 debug("   - %s, %s\n", name, prop);
 529                 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
 530                     strncmp(name, base, base_len))
 531                         continue;
 532
 533                 slash = strrchr(prop, '/');
 534                 if (strcmp(slash + 1, find_name))
 535                         continue;
 536                 val = trailing_strtol(name);
 537                 if (val != -1) {
 538                         *seqp = val;
 539                         debug("Found seq %d\n", *seqp);
 540                         return 0;
 541                 }
 542         }
 543
 544         debug("Not found\n");
 545         return -ENOENT;
 546 }
 547
 548 const char *fdtdec_get_chosen_prop(const void *blob, const char *name)
 549 {
 550         int chosen_node;
 551
 552         if (!blob)
 553                 return NULL;
 554         chosen_node = fdt_path_offset(blob, "/chosen");
 555         return fdt_getprop(blob, chosen_node, name, NULL);
 556 }
 557
 558 int fdtdec_get_chosen_node(const void *blob, const char *name)
 559 {
 560         const char *prop;
 561
 562         prop = fdtdec_get_chosen_prop(blob, name);
 563         if (!prop)
 564                 return -FDT_ERR_NOTFOUND;
 565         return fdt_path_offset(blob, prop);
 566 }
 567
 568 int fdtdec_check_fdt(void)
 569 {
 570         /*
 571          * We must have an FDT, but we cannot panic() yet since the console
 572          * is not ready. So for now, just assert(). Boards which need an early
 573          * FDT (prior to console ready) will need to make their own
 574          * arrangements and do their own checks.
 575          */
 576         assert(!fdtdec_prepare_fdt());
 577         return 0;
 578 }
 579
 580 /*
 581  * This function is a little odd in that it accesses global data. At some
 582  * point if the architecture board.c files merge this will make more sense.
 583  * Even now, it is common code.
 584  */
 585 int fdtdec_prepare_fdt(void)
 586 {
 587         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 588             fdt_check_header(gd->fdt_blob)) {
 589 #ifdef CONFIG_SPL_BUILD
 590                 puts("Missing DTB\n");
 591 #else
 592                 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");
 593 # ifdef DEBUG
 594                 if (gd->fdt_blob) {
 595                         printf("fdt_blob=%p\n", gd->fdt_blob);
 596                         print_buffer((ulong)gd->fdt_blob, gd->fdt_blob, 4,
 597                                      32, 0);
 598                 }
 599 # endif
 600 #endif
 601                 return -1;
 602         }
 603         return 0;
 604 }
 605
 606 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 607 {
 608         const u32 *phandle;
 609         int lookup;
 610
 611         debug("%s: %s\n", __func__, prop_name);
 612         phandle = fdt_getprop(blob, node, prop_name, NULL);
 613         if (!phandle)
 614                 return -FDT_ERR_NOTFOUND;
 615
 616         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 617         return lookup;
 618 }
 619
 620 /**
 621  * Look up a property in a node and check that it has a minimum length.
 622  *
 623  * @param blob          FDT blob
 624  * @param node          node to examine
 625  * @param prop_name     name of property to find
 626  * @param min_len       minimum property length in bytes
 627  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 628                         found, or -FDT_ERR_BADLAYOUT if not enough data
 629  * @return pointer to cell, which is only valid if err == 0
 630  */
 631 static const void *get_prop_check_min_len(const void *blob, int node,
 632                 const char *prop_name, int min_len, int *err)
 633 {
 634         const void *cell;
 635         int len;
 636
 637         debug("%s: %s\n", __func__, prop_name);
 638         cell = fdt_getprop(blob, node, prop_name, &len);
 639         if (!cell)
 640                 *err = -FDT_ERR_NOTFOUND;
 641         else if (len < min_len)
 642                 *err = -FDT_ERR_BADLAYOUT;
 643         else
 644                 *err = 0;
 645         return cell;
 646 }
 647
 648 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 649                 u32 *array, int count)
 650 {
 651         const u32 *cell;
 652         int i, err = 0;
 653
 654         debug("%s: %s\n", __func__, prop_name);
 655         cell = get_prop_check_min_len(blob, node, prop_name,
 656                                       sizeof(u32) * count, &err);
 657         if (!err) {
 658                 for (i = 0; i < count; i++)
 659                         array[i] = fdt32_to_cpu(cell[i]);
 660         }
 661         return err;
 662 }
 663
 664 int fdtdec_get_int_array_count(const void *blob, int node,
 665                                const char *prop_name, u32 *array, int count)
 666 {
 667         const u32 *cell;
 668         int len, elems;
 669         int i;
 670
 671         debug("%s: %s\n", __func__, prop_name);
 672         cell = fdt_getprop(blob, node, prop_name, &len);
 673         if (!cell)
 674                 return -FDT_ERR_NOTFOUND;
 675         elems = len / sizeof(u32);
 676         if (count > elems)
 677                 count = elems;
 678         for (i = 0; i < count; i++)
 679                 array[i] = fdt32_to_cpu(cell[i]);
 680
 681         return count;
 682 }
 683
 684 const u32 *fdtdec_locate_array(const void *blob, int node,
 685                                const char *prop_name, int count)
 686 {
 687         const u32 *cell;
 688         int err;
 689
 690         cell = get_prop_check_min_len(blob, node, prop_name,
 691                                       sizeof(u32) * count, &err);
 692         return err ? NULL : cell;
 693 }
 694
 695 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 696 {
 697         const s32 *cell;
 698         int len;
 699
 700         debug("%s: %s\n", __func__, prop_name);
 701         cell = fdt_getprop(blob, node, prop_name, &len);
 702         return cell != NULL;
 703 }
 704
 705 int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
 706                                    const char *list_name,
 707                                    const char *cells_name,
 708                                    int cell_count, int index,
 709                                    struct fdtdec_phandle_args *out_args)
 710 {
 711         const __be32 *list, *list_end;
 712         int rc = 0, size, cur_index = 0;
 713         uint32_t count = 0;
 714         int node = -1;
 715         int phandle;
 716
 717         /* Retrieve the phandle list property */
 718         list = fdt_getprop(blob, src_node, list_name, &size);
 719         if (!list)
 720                 return -ENOENT;
 721         list_end = list + size / sizeof(*list);
 722
 723         /* Loop over the phandles until all the requested entry is found */
 724         while (list < list_end) {
 725                 rc = -EINVAL;
 726                 count = 0;
 727
 728                 /*
 729                  * If phandle is 0, then it is an empty entry with no
 730                  * arguments.  Skip forward to the next entry.
 731                  */
 732                 phandle = be32_to_cpup(list++);
 733                 if (phandle) {
 734                         /*
 735                          * Find the provider node and parse the #*-cells
 736                          * property to determine the argument length.
 737                          *
 738                          * This is not needed if the cell count is hard-coded
 739                          * (i.e. cells_name not set, but cell_count is set),
 740                          * except when we're going to return the found node
 741                          * below.
 742                          */
 743                         if (cells_name || cur_index == index) {
 744                                 node = fdt_node_offset_by_phandle(blob,
 745                                                                   phandle);
 746                                 if (!node) {
 747                                         debug("%s: could not find phandle\n",
 748                                               fdt_get_name(blob, src_node,
 749                                                            NULL));
 750                                         goto err;
 751                                 }
 752                         }
 753
 754                         if (cells_name) {
 755                                 count = fdtdec_get_int(blob, node, cells_name,
 756                                                        -1);
 757                                 if (count == -1) {
 758                                         debug("%s: could not get %s for %s\n",
 759                                               fdt_get_name(blob, src_node,
 760                                                            NULL),
 761                                               cells_name,
 762                                               fdt_get_name(blob, node,
 763                                                            NULL));
 764                                         goto err;
 765                                 }
 766                         } else {
 767                                 count = cell_count;
 768                         }
 769
 770                         /*
 771                          * Make sure that the arguments actually fit in the
 772                          * remaining property data length
 773                          */
 774                         if (list + count > list_end) {
 775                                 debug("%s: arguments longer than property\n",
 776                                       fdt_get_name(blob, src_node, NULL));
 777                                 goto err;
 778                         }
 779                 }
 780
 781                 /*
 782                  * All of the error cases above bail out of the loop, so at
 783                  * this point, the parsing is successful. If the requested
 784                  * index matches, then fill the out_args structure and return,
 785                  * or return -ENOENT for an empty entry.
 786                  */
 787                 rc = -ENOENT;
 788                 if (cur_index == index) {
 789                         if (!phandle)
 790                                 goto err;
 791
 792                         if (out_args) {
 793                                 int i;
 794
 795                                 if (count > MAX_PHANDLE_ARGS) {
 796                                         debug("%s: too many arguments %d\n",
 797                                               fdt_get_name(blob, src_node,
 798                                                            NULL), count);
 799                                         count = MAX_PHANDLE_ARGS;
 800                                 }
 801                                 out_args->node = node;
 802                                 out_args->args_count = count;
 803                                 for (i = 0; i < count; i++) {
 804                                         out_args->args[i] =
 805                                                         be32_to_cpup(list++);
 806                                 }
 807                         }
 808
 809                         /* Found it! return success */
 810                         return 0;
 811                 }
 812
 813                 node = -1;
 814                 list += count;
 815                 cur_index++;
 816         }
 817
 818         /*
 819          * Result will be one of:
 820          * -ENOENT : index is for empty phandle
 821          * -EINVAL : parsing error on data
 822          * [1..n]  : Number of phandle (count mode; when index = -1)
 823          */
 824         rc = index < 0 ? cur_index : -ENOENT;
 825  err:
 826         return rc;
 827 }
 828
 829 int fdtdec_get_child_count(const void *blob, int node)
 830 {
 831         int subnode;
 832         int num = 0;
 833
 834         fdt_for_each_subnode(blob, subnode, node)
 835                 num++;
 836
 837         return num;
 838 }
 839
 840 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 841                 u8 *array, int count)
 842 {
 843         const u8 *cell;
 844         int err;
 845
 846         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 847         if (!err)
 848                 memcpy(array, cell, count);
 849         return err;
 850 }
 851
 852 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 853                              const char *prop_name, int count)
 854 {
 855         const u8 *cell;
 856         int err;
 857
 858         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 859         if (err)
 860                 return NULL;
 861         return cell;
 862 }
 863
 864 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 865                 int default_val)
 866 {
 867         int config_node;
 868
 869         debug("%s: %s\n", __func__, prop_name);
 870         config_node = fdt_path_offset(blob, "/config");
 871         if (config_node < 0)
 872                 return default_val;
 873         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 874 }
 875
 876 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 877 {
 878         int config_node;
 879         const void *prop;
 880
 881         debug("%s: %s\n", __func__, prop_name);
 882         config_node = fdt_path_offset(blob, "/config");
 883         if (config_node < 0)
 884                 return 0;
 885         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 886
 887         return prop != NULL;
 888 }
 889
 890 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 891 {
 892         const char *nodep;
 893         int nodeoffset;
 894         int len;
 895
 896         debug("%s: %s\n", __func__, prop_name);
 897         nodeoffset = fdt_path_offset(blob, "/config");
 898         if (nodeoffset < 0)
 899                 return NULL;
 900
 901         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 902         if (!nodep)
 903                 return NULL;
 904
 905         return (char *)nodep;
 906 }
 907
 908 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
 909                          fdt_addr_t *basep, fdt_size_t *sizep)
 910 {
 911         const fdt_addr_t *cell;
 912         int len;
 913
 914         debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL),
 915               prop_name);
 916         cell = fdt_getprop(blob, node, prop_name, &len);
 917         if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
 918                 debug("cell=%p, len=%d\n", cell, len);
 919                 return -1;
 920         }
 921
 922         *basep = fdt_addr_to_cpu(*cell);
 923         *sizep = fdt_size_to_cpu(cell[1]);
 924         debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
 925               (ulong)*sizep);
 926
 927         return 0;
 928 }
 929
 930 /**
 931  * Read a flash entry from the fdt
 932  *
 933  * @param blob          FDT blob
 934  * @param node          Offset of node to read
 935  * @param name          Name of node being read
 936  * @param entry         Place to put offset and size of this node
 937  * @return 0 if ok, -ve on error
 938  */
 939 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
 940                            struct fmap_entry *entry)
 941 {
 942         const char *prop;
 943         u32 reg[2];
 944
 945         if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
 946                 debug("Node '%s' has bad/missing 'reg' property\n", name);
 947                 return -FDT_ERR_NOTFOUND;
 948         }
 949         entry->offset = reg[0];
 950         entry->length = reg[1];
 951         entry->used = fdtdec_get_int(blob, node, "used", entry->length);
 952         prop = fdt_getprop(blob, node, "compress", NULL);
 953         entry->compress_algo = prop && !strcmp(prop, "lzo") ?
 954                 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE;
 955         prop = fdt_getprop(blob, node, "hash", &entry->hash_size);
 956         entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
 957         entry->hash = (uint8_t *)prop;
 958
 959         return 0;
 960 }
 961
 962 u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
 963 {
 964         u64 number = 0;
 965
 966         while (cells--)
 967                 number = (number << 32) | fdt32_to_cpu(*ptr++);
 968
 969         return number;
 970 }
 971
 972 int fdt_get_resource(const void *fdt, int node, const char *property,
 973                      unsigned int index, struct fdt_resource *res)
 974 {
 975         const fdt32_t *ptr, *end;
 976         int na, ns, len, parent;
 977         unsigned int i = 0;
 978
 979         parent = fdt_parent_offset(fdt, node);
 980         if (parent < 0)
 981                 return parent;
 982
 983         na = fdt_address_cells(fdt, parent);
 984         ns = fdt_size_cells(fdt, parent);
 985
 986         ptr = fdt_getprop(fdt, node, property, &len);
 987         if (!ptr)
 988                 return len;
 989
 990         end = ptr + len / sizeof(*ptr);
 991
 992         while (ptr + na + ns <= end) {
 993                 if (i == index) {
 994                         res->start = res->end = fdtdec_get_number(ptr, na);
 995                         res->end += fdtdec_get_number(&ptr[na], ns) - 1;
 996                         return 0;
 997                 }
 998
 999                 ptr += na + ns;
1000                 i++;
1001         }
1002
1003         return -FDT_ERR_NOTFOUND;
1004 }
1005
1006 int fdt_get_named_resource(const void *fdt, int node, const char *property,
1007                            const char *prop_names, const char *name,
1008                            struct fdt_resource *res)
1009 {
1010         int index;
1011
1012         index = fdt_find_string(fdt, node, prop_names, name);
1013         if (index < 0)
1014                 return index;
1015
1016         return fdt_get_resource(fdt, node, property, index, res);
1017 }
1018
1019 int fdtdec_decode_memory_region(const void *blob, int config_node,
1020                                 const char *mem_type, const char *suffix,
1021                                 fdt_addr_t *basep, fdt_size_t *sizep)
1022 {
1023         char prop_name[50];
1024         const char *mem;
1025         fdt_size_t size, offset_size;
1026         fdt_addr_t base, offset;
1027         int node;
1028
1029         if (config_node == -1) {
1030                 config_node = fdt_path_offset(blob, "/config");
1031                 if (config_node < 0) {
1032                         debug("%s: Cannot find /config node\n", __func__);
1033                         return -ENOENT;
1034                 }
1035         }
1036         if (!suffix)
1037                 suffix = "";
1038
1039         snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
1040                  suffix);
1041         mem = fdt_getprop(blob, config_node, prop_name, NULL);
1042         if (!mem) {
1043                 debug("%s: No memory type for '%s', using /memory\n", __func__,
1044                       prop_name);
1045                 mem = "/memory";
1046         }
1047
1048         node = fdt_path_offset(blob, mem);
1049         if (node < 0) {
1050                 debug("%s: Failed to find node '%s': %s\n", __func__, mem,
1051                       fdt_strerror(node));
1052                 return -ENOENT;
1053         }
1054
1055         /*
1056          * Not strictly correct - the memory may have multiple banks. We just
1057          * use the first
1058          */
1059         if (fdtdec_decode_region(blob, node, "reg", &base, &size)) {
1060                 debug("%s: Failed to decode memory region %s\n", __func__,
1061                       mem);
1062                 return -EINVAL;
1063         }
1064
1065         snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
1066                  suffix);
1067         if (fdtdec_decode_region(blob, config_node, prop_name, &offset,
1068                                  &offset_size)) {
1069                 debug("%s: Failed to decode memory region '%s'\n", __func__,
1070                       prop_name);
1071                 return -EINVAL;
1072         }
1073
1074         *basep = base + offset;
1075         *sizep = offset_size;
1076
1077         return 0;
1078 }
1079
1080 static int decode_timing_property(const void *blob, int node, const char *name,
1081                                   struct timing_entry *result)
1082 {
1083         int length, ret = 0;
1084         const u32 *prop;
1085
1086         prop = fdt_getprop(blob, node, name, &length);
1087         if (!prop) {
1088                 debug("%s: could not find property %s\n",
1089                       fdt_get_name(blob, node, NULL), name);
1090                 return length;
1091         }
1092
1093         if (length == sizeof(u32)) {
1094                 result->typ = fdtdec_get_int(blob, node, name, 0);
1095                 result->min = result->typ;
1096                 result->max = result->typ;
1097         } else {
1098                 ret = fdtdec_get_int_array(blob, node, name, &result->min, 3);
1099         }
1100
1101         return ret;
1102 }
1103
1104 int fdtdec_decode_display_timing(const void *blob, int parent, int index,
1105                                  struct display_timing *dt)
1106 {
1107         int i, node, timings_node;
1108         u32 val = 0;
1109         int ret = 0;
1110
1111         timings_node = fdt_subnode_offset(blob, parent, "display-timings");
1112         if (timings_node < 0)
1113                 return timings_node;
1114
1115         for (i = 0, node = fdt_first_subnode(blob, timings_node);
1116              node > 0 && i != index;
1117              node = fdt_next_subnode(blob, node))
1118                 i++;
1119
1120         if (node < 0)
1121                 return node;
1122
1123         memset(dt, 0, sizeof(*dt));
1124
1125         ret |= decode_timing_property(blob, node, "hback-porch",
1126                                       &dt->hback_porch);
1127         ret |= decode_timing_property(blob, node, "hfront-porch",
1128                                       &dt->hfront_porch);
1129         ret |= decode_timing_property(blob, node, "hactive", &dt->hactive);
1130         ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len);
1131         ret |= decode_timing_property(blob, node, "vback-porch",
1132                                       &dt->vback_porch);
1133         ret |= decode_timing_property(blob, node, "vfront-porch",
1134                                       &dt->vfront_porch);
1135         ret |= decode_timing_property(blob, node, "vactive", &dt->vactive);
1136         ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len);
1137         ret |= decode_timing_property(blob, node, "clock-frequency",
1138                                       &dt->pixelclock);
1139
1140         dt->flags = 0;
1141         val = fdtdec_get_int(blob, node, "vsync-active", -1);
1142         if (val != -1) {
1143                 dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
1144                                 DISPLAY_FLAGS_VSYNC_LOW;
1145         }
1146         val = fdtdec_get_int(blob, node, "hsync-active", -1);
1147         if (val != -1) {
1148                 dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
1149                                 DISPLAY_FLAGS_HSYNC_LOW;
1150         }
1151         val = fdtdec_get_int(blob, node, "de-active", -1);
1152         if (val != -1) {
1153                 dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
1154                                 DISPLAY_FLAGS_DE_LOW;
1155         }
1156         val = fdtdec_get_int(blob, node, "pixelclk-active", -1);
1157         if (val != -1) {
1158                 dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
1159                                 DISPLAY_FLAGS_PIXDATA_NEGEDGE;
1160         }
1161
1162         if (fdtdec_get_bool(blob, node, "interlaced"))
1163                 dt->flags |= DISPLAY_FLAGS_INTERLACED;
1164         if (fdtdec_get_bool(blob, node, "doublescan"))
1165                 dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1166         if (fdtdec_get_bool(blob, node, "doubleclk"))
1167                 dt->flags |= DISPLAY_FLAGS_DOUBLECLK;
1168
1169         return ret;
1170 }
1171
1172 int fdtdec_setup(void)
1173 {
1174 #if CONFIG_IS_ENABLED(OF_CONTROL)
1175 # ifdef CONFIG_OF_EMBED
1176         /* Get a pointer to the FDT */
1177         gd->fdt_blob = __dtb_dt_begin;
1178 # elif defined CONFIG_OF_SEPARATE
1179 #  ifdef CONFIG_SPL_BUILD
1180         /* FDT is at end of BSS unless it is in a different memory region */
1181         if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
1182                 gd->fdt_blob = (ulong *)&_image_binary_end;
1183         else
1184                 gd->fdt_blob = (ulong *)&__bss_end;
1185 #  else
1186         /* FDT is at end of image */
1187         gd->fdt_blob = (ulong *)&_end;
1188 #  endif
1189 # elif defined(CONFIG_OF_HOSTFILE)
1190         if (sandbox_read_fdt_from_file()) {
1191                 puts("Failed to read control FDT\n");
1192                 return -1;
1193         }
1194 # endif
1195 # ifndef CONFIG_SPL_BUILD
1196         /* Allow the early environment to override the fdt address */
1197         gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
1198                                                 (uintptr_t)gd->fdt_blob);
1199 # endif
1200 #endif
1201         return fdtdec_prepare_fdt();
1202 }
1203
1204 #endif /* !USE_HOSTCC */