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 <fdt_support.h>
  13 #include <fdtdec.h>
  14 #include <asm/sections.h>
  15 #include <linux/ctype.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 /*
  20  * Here are the type we know about. One day we might allow drivers to
  21  * register. For now we just put them here. The COMPAT macro allows us to
  22  * turn this into a sparse list later, and keeps the ID with the name.
  23  *
  24  * NOTE: This list is basically a TODO list for things that need to be
  25  * converted to driver model. So don't add new things here unless there is a
  26  * good reason why driver-model conversion is infeasible. Examples include
  27  * things which are used before driver model is available.
  28  */
  29 #define COMPAT(id, name) name
  30 static const char * const compat_names[COMPAT_COUNT] = {
  31         COMPAT(UNKNOWN, "<none>"),
  32         COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
  33         COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
  34         COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
  35         COMPAT(NVIDIA_TEGRA124_PMC, "nvidia,tegra124-pmc"),
  36         COMPAT(NVIDIA_TEGRA186_SDMMC, "nvidia,tegra186-sdhci"),
  37         COMPAT(NVIDIA_TEGRA210_SDMMC, "nvidia,tegra210-sdhci"),
  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_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
  42         COMPAT(NVIDIA_TEGRA210_XUSB_PADCTL, "nvidia,tegra210-xusb-padctl"),
  43         COMPAT(SMSC_LAN9215, "smsc,lan9215"),
  44         COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
  45         COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
  46         COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
  47         COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
  48         COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
  49         COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
  50         COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
  51         COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
  52         COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
  53         COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
  54         COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686"),
  55         COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
  56         COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
  57         COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
  58         COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
  59         COMPAT(INTEL_MICROCODE, "intel,microcode"),
  60         COMPAT(AMS_AS3722, "ams,as3722"),
  61         COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
  62         COMPAT(SOCIONEXT_XHCI, "socionext,uniphier-xhci"),
  63         COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"),
  64         COMPAT(ALTERA_SOCFPGA_DWMMC, "altr,socfpga-dw-mshc"),
  65         COMPAT(ALTERA_SOCFPGA_DWC2USB, "snps,dwc2"),
  66         COMPAT(INTEL_BAYTRAIL_FSP, "intel,baytrail-fsp"),
  67         COMPAT(INTEL_BAYTRAIL_FSP_MDP, "intel,baytrail-fsp-mdp"),
  68         COMPAT(INTEL_IVYBRIDGE_FSP, "intel,ivybridge-fsp"),
  69         COMPAT(COMPAT_SUNXI_NAND, "allwinner,sun4i-a10-nand"),
  70 };
  71
  72 const char *fdtdec_get_compatible(enum fdt_compat_id id)
  73 {
  74         /* We allow reading of the 'unknown' ID for testing purposes */
  75         assert(id >= 0 && id < COMPAT_COUNT);
  76         return compat_names[id];
  77 }
  78
  79 fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
  80                 const char *prop_name, int index, int na, int ns,
  81                 fdt_size_t *sizep, bool translate)
  82 {
  83         const fdt32_t *prop, *prop_end;
  84         const fdt32_t *prop_addr, *prop_size, *prop_after_size;
  85         int len;
  86         fdt_addr_t addr;
  87
  88         debug("%s: %s: ", __func__, prop_name);
  89
  90         if (na > (sizeof(fdt_addr_t) / sizeof(fdt32_t))) {
  91                 debug("(na too large for fdt_addr_t type)\n");
  92                 return FDT_ADDR_T_NONE;
  93         }
  94
  95         if (ns > (sizeof(fdt_size_t) / sizeof(fdt32_t))) {
  96                 debug("(ns too large for fdt_size_t type)\n");
  97                 return FDT_ADDR_T_NONE;
  98         }
  99
 100         prop = fdt_getprop(blob, node, prop_name, &len);
 101         if (!prop) {
 102                 debug("(not found)\n");
 103                 return FDT_ADDR_T_NONE;
 104         }
 105         prop_end = prop + (len / sizeof(*prop));
 106
 107         prop_addr = prop + (index * (na + ns));
 108         prop_size = prop_addr + na;
 109         prop_after_size = prop_size + ns;
 110         if (prop_after_size > prop_end) {
 111                 debug("(not enough data: expected >= %d cells, got %d cells)\n",
 112                       (u32)(prop_after_size - prop), ((u32)(prop_end - prop)));
 113                 return FDT_ADDR_T_NONE;
 114         }
 115
 116 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_OF_LIBFDT)
 117         if (translate)
 118                 addr = fdt_translate_address(blob, node, prop_addr);
 119         else
 120 #endif
 121                 addr = fdtdec_get_number(prop_addr, na);
 122
 123         if (sizep) {
 124                 *sizep = fdtdec_get_number(prop_size, ns);
 125                 debug("addr=%08llx, size=%llx\n", (unsigned long long)addr,
 126                       (unsigned long long)*sizep);
 127         } else {
 128                 debug("addr=%08llx\n", (unsigned long long)addr);
 129         }
 130
 131         return addr;
 132 }
 133
 134 fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
 135                 int node, const char *prop_name, int index, fdt_size_t *sizep,
 136                 bool translate)
 137 {
 138         int na, ns;
 139
 140         debug("%s: ", __func__);
 141
 142         na = fdt_address_cells(blob, parent);
 143         if (na < 1) {
 144                 debug("(bad #address-cells)\n");
 145                 return FDT_ADDR_T_NONE;
 146         }
 147
 148         ns = fdt_size_cells(blob, parent);
 149         if (ns < 0) {
 150                 debug("(bad #size-cells)\n");
 151                 return FDT_ADDR_T_NONE;
 152         }
 153
 154         debug("na=%d, ns=%d, ", na, ns);
 155
 156         return fdtdec_get_addr_size_fixed(blob, node, prop_name, index, na,
 157                                           ns, sizep, translate);
 158 }
 159
 160 fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
 161                 const char *prop_name, int index, fdt_size_t *sizep,
 162                 bool translate)
 163 {
 164         int parent;
 165
 166         debug("%s: ", __func__);
 167
 168         parent = fdt_parent_offset(blob, node);
 169         if (parent < 0) {
 170                 debug("(no parent found)\n");
 171                 return FDT_ADDR_T_NONE;
 172         }
 173
 174         return fdtdec_get_addr_size_auto_parent(blob, parent, node, prop_name,
 175                                                 index, sizep, translate);
 176 }
 177
 178 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
 179                 const char *prop_name, fdt_size_t *sizep)
 180 {
 181         int ns = sizep ? (sizeof(fdt_size_t) / sizeof(fdt32_t)) : 0;
 182
 183         return fdtdec_get_addr_size_fixed(blob, node, prop_name, 0,
 184                                           sizeof(fdt_addr_t) / sizeof(fdt32_t),
 185                                           ns, sizep, false);
 186 }
 187
 188 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
 189                 const char *prop_name)
 190 {
 191         return fdtdec_get_addr_size(blob, node, prop_name, NULL);
 192 }
 193
 194 #if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
 195 int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
 196                 const char *prop_name, struct fdt_pci_addr *addr)
 197 {
 198         const u32 *cell;
 199         int len;
 200         int ret = -ENOENT;
 201
 202         debug("%s: %s: ", __func__, prop_name);
 203
 204         /*
 205          * If we follow the pci bus bindings strictly, we should check
 206          * the value of the node's parent node's #address-cells and
 207          * #size-cells. They need to be 3 and 2 accordingly. However,
 208          * for simplicity we skip the check here.
 209          */
 210         cell = fdt_getprop(blob, node, prop_name, &len);
 211         if (!cell)
 212                 goto fail;
 213
 214         if ((len % FDT_PCI_REG_SIZE) == 0) {
 215                 int num = len / FDT_PCI_REG_SIZE;
 216                 int i;
 217
 218                 for (i = 0; i < num; i++) {
 219                         debug("pci address #%d: %08lx %08lx %08lx\n", i,
 220                               (ulong)fdt32_to_cpu(cell[0]),
 221                               (ulong)fdt32_to_cpu(cell[1]),
 222                               (ulong)fdt32_to_cpu(cell[2]));
 223                         if ((fdt32_to_cpu(*cell) & type) == type) {
 224                                 addr->phys_hi = fdt32_to_cpu(cell[0]);
 225                                 addr->phys_mid = fdt32_to_cpu(cell[1]);
 226                                 addr->phys_lo = fdt32_to_cpu(cell[1]);
 227                                 break;
 228                         } else {
 229                                 cell += (FDT_PCI_ADDR_CELLS +
 230                                          FDT_PCI_SIZE_CELLS);
 231                         }
 232                 }
 233
 234                 if (i == num) {
 235                         ret = -ENXIO;
 236                         goto fail;
 237                 }
 238
 239                 return 0;
 240         } else {
 241                 ret = -EINVAL;
 242         }
 243
 244 fail:
 245         debug("(not found)\n");
 246         return ret;
 247 }
 248
 249 int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device)
 250 {
 251         const char *list, *end;
 252         int len;
 253
 254         list = fdt_getprop(blob, node, "compatible", &len);
 255         if (!list)
 256                 return -ENOENT;
 257
 258         end = list + len;
 259         while (list < end) {
 260                 char *s;
 261
 262                 len = strlen(list);
 263                 if (len >= strlen("pciVVVV,DDDD")) {
 264                         s = strstr(list, "pci");
 265
 266                         /*
 267                          * check if the string is something like pciVVVV,DDDD.RR
 268                          * or just pciVVVV,DDDD
 269                          */
 270                         if (s && s[7] == ',' &&
 271                             (s[12] == '.' || s[12] == 0)) {
 272                                 s += 3;
 273                                 *vendor = simple_strtol(s, NULL, 16);
 274
 275                                 s += 5;
 276                                 *device = simple_strtol(s, NULL, 16);
 277
 278                                 return 0;
 279                         }
 280                 }
 281                 list += (len + 1);
 282         }
 283
 284         return -ENOENT;
 285 }
 286
 287 int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
 288                          u32 *bar)
 289 {
 290         int barnum;
 291
 292         /* extract the bar number from fdt_pci_addr */
 293         barnum = addr->phys_hi & 0xff;
 294         if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS))
 295                 return -EINVAL;
 296
 297         barnum = (barnum - PCI_BASE_ADDRESS_0) / 4;
 298         *bar = dm_pci_read_bar32(dev, barnum);
 299
 300         return 0;
 301 }
 302 #endif
 303
 304 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
 305                 uint64_t default_val)
 306 {
 307         const uint64_t *cell64;
 308         int length;
 309
 310         cell64 = fdt_getprop(blob, node, prop_name, &length);
 311         if (!cell64 || length < sizeof(*cell64))
 312                 return default_val;
 313
 314         return fdt64_to_cpu(*cell64);
 315 }
 316
 317 int fdtdec_get_is_enabled(const void *blob, int node)
 318 {
 319         const char *cell;
 320
 321         /*
 322          * It should say "okay", so only allow that. Some fdts use "ok" but
 323          * this is a bug. Please fix your device tree source file. See here
 324          * for discussion:
 325          *
 326          * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
 327          */
 328         cell = fdt_getprop(blob, node, "status", NULL);
 329         if (cell)
 330                 return 0 == strcmp(cell, "okay");
 331         return 1;
 332 }
 333
 334 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 335 {
 336         enum fdt_compat_id id;
 337
 338         /* Search our drivers */
 339         for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
 340                 if (0 == fdt_node_check_compatible(blob, node,
 341                                 compat_names[id]))
 342                         return id;
 343         return COMPAT_UNKNOWN;
 344 }
 345
 346 int fdtdec_next_compatible(const void *blob, int node,
 347                 enum fdt_compat_id id)
 348 {
 349         return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
 350 }
 351
 352 int fdtdec_next_compatible_subnode(const void *blob, int node,
 353                 enum fdt_compat_id id, int *depthp)
 354 {
 355         do {
 356                 node = fdt_next_node(blob, node, depthp);
 357         } while (*depthp > 1);
 358
 359         /* If this is a direct subnode, and compatible, return it */
 360         if (*depthp == 1 && 0 == fdt_node_check_compatible(
 361                                                 blob, node, compat_names[id]))
 362                 return node;
 363
 364         return -FDT_ERR_NOTFOUND;
 365 }
 366
 367 int fdtdec_next_alias(const void *blob, const char *name,
 368                 enum fdt_compat_id id, int *upto)
 369 {
 370 #define MAX_STR_LEN 20
 371         char str[MAX_STR_LEN + 20];
 372         int node, err;
 373
 374         /* snprintf() is not available */
 375         assert(strlen(name) < MAX_STR_LEN);
 376         sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
 377         node = fdt_path_offset(blob, str);
 378         if (node < 0)
 379                 return node;
 380         err = fdt_node_check_compatible(blob, node, compat_names[id]);
 381         if (err < 0)
 382                 return err;
 383         if (err)
 384                 return -FDT_ERR_NOTFOUND;
 385         (*upto)++;
 386         return node;
 387 }
 388
 389 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
 390                         enum fdt_compat_id id, int *node_list, int maxcount)
 391 {
 392         memset(node_list, '\0', sizeof(*node_list) * maxcount);
 393
 394         return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
 395 }
 396
 397 /* TODO: Can we tighten this code up a little? */
 398 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
 399                         enum fdt_compat_id id, int *node_list, int maxcount)
 400 {
 401         int name_len = strlen(name);
 402         int nodes[maxcount];
 403         int num_found = 0;
 404         int offset, node;
 405         int alias_node;
 406         int count;
 407         int i, j;
 408
 409         /* find the alias node if present */
 410         alias_node = fdt_path_offset(blob, "/aliases");
 411
 412         /*
 413          * start with nothing, and we can assume that the root node can't
 414          * match
 415          */
 416         memset(nodes, '\0', sizeof(nodes));
 417
 418         /* First find all the compatible nodes */
 419         for (node = count = 0; node >= 0 && count < maxcount;) {
 420                 node = fdtdec_next_compatible(blob, node, id);
 421                 if (node >= 0)
 422                         nodes[count++] = node;
 423         }
 424         if (node >= 0)
 425                 debug("%s: warning: maxcount exceeded with alias '%s'\n",
 426                        __func__, name);
 427
 428         /* Now find all the aliases */
 429         for (offset = fdt_first_property_offset(blob, alias_node);
 430                         offset > 0;
 431                         offset = fdt_next_property_offset(blob, offset)) {
 432                 const struct fdt_property *prop;
 433                 const char *path;
 434                 int number;
 435                 int found;
 436
 437                 node = 0;
 438                 prop = fdt_get_property_by_offset(blob, offset, NULL);
 439                 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 440                 if (prop->len && 0 == strncmp(path, name, name_len))
 441                         node = fdt_path_offset(blob, prop->data);
 442                 if (node <= 0)
 443                         continue;
 444
 445                 /* Get the alias number */
 446                 number = simple_strtoul(path + name_len, NULL, 10);
 447                 if (number < 0 || number >= maxcount) {
 448                         debug("%s: warning: alias '%s' is out of range\n",
 449                                __func__, path);
 450                         continue;
 451                 }
 452
 453                 /* Make sure the node we found is actually in our list! */
 454                 found = -1;
 455                 for (j = 0; j < count; j++)
 456                         if (nodes[j] == node) {
 457                                 found = j;
 458                                 break;
 459                         }
 460
 461                 if (found == -1) {
 462                         debug("%s: warning: alias '%s' points to a node "
 463                                 "'%s' that is missing or is not compatible "
 464                                 " with '%s'\n", __func__, path,
 465                                 fdt_get_name(blob, node, NULL),
 466                                compat_names[id]);
 467                         continue;
 468                 }
 469
 470                 /*
 471                  * Add this node to our list in the right place, and mark
 472                  * it as done.
 473                  */
 474                 if (fdtdec_get_is_enabled(blob, node)) {
 475                         if (node_list[number]) {
 476                                 debug("%s: warning: alias '%s' requires that "
 477                                       "a node be placed in the list in a "
 478                                       "position which is already filled by "
 479                                       "node '%s'\n", __func__, path,
 480                                       fdt_get_name(blob, node, NULL));
 481                                 continue;
 482                         }
 483                         node_list[number] = node;
 484                         if (number >= num_found)
 485                                 num_found = number + 1;
 486                 }
 487                 nodes[found] = 0;
 488         }
 489
 490         /* Add any nodes not mentioned by an alias */
 491         for (i = j = 0; i < maxcount; i++) {
 492                 if (!node_list[i]) {
 493                         for (; j < maxcount; j++)
 494                                 if (nodes[j] &&
 495                                         fdtdec_get_is_enabled(blob, nodes[j]))
 496                                         break;
 497
 498                         /* Have we run out of nodes to add? */
 499                         if (j == maxcount)
 500                                 break;
 501
 502                         assert(!node_list[i]);
 503                         node_list[i] = nodes[j++];
 504                         if (i >= num_found)
 505                                 num_found = i + 1;
 506                 }
 507         }
 508
 509         return num_found;
 510 }
 511
 512 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
 513                          int *seqp)
 514 {
 515         int base_len = strlen(base);
 516         const char *find_name;
 517         int find_namelen;
 518         int prop_offset;
 519         int aliases;
 520
 521         find_name = fdt_get_name(blob, offset, &find_namelen);
 522         debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
 523
 524         aliases = fdt_path_offset(blob, "/aliases");
 525         for (prop_offset = fdt_first_property_offset(blob, aliases);
 526              prop_offset > 0;
 527              prop_offset = fdt_next_property_offset(blob, prop_offset)) {
 528                 const char *prop;
 529                 const char *name;
 530                 const char *slash;
 531                 int len, val;
 532
 533                 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
 534                 debug("   - %s, %s\n", name, prop);
 535                 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
 536                     strncmp(name, base, base_len))
 537                         continue;
 538
 539                 slash = strrchr(prop, '/');
 540                 if (strcmp(slash + 1, find_name))
 541                         continue;
 542                 val = trailing_strtol(name);
 543                 if (val != -1) {
 544                         *seqp = val;
 545                         debug("Found seq %d\n", *seqp);
 546                         return 0;
 547                 }
 548         }
 549
 550         debug("Not found\n");
 551         return -ENOENT;
 552 }
 553
 554 const char *fdtdec_get_chosen_prop(const void *blob, const char *name)
 555 {
 556         int chosen_node;
 557
 558         if (!blob)
 559                 return NULL;
 560         chosen_node = fdt_path_offset(blob, "/chosen");
 561         return fdt_getprop(blob, chosen_node, name, NULL);
 562 }
 563
 564 int fdtdec_get_chosen_node(const void *blob, const char *name)
 565 {
 566         const char *prop;
 567
 568         prop = fdtdec_get_chosen_prop(blob, name);
 569         if (!prop)
 570                 return -FDT_ERR_NOTFOUND;
 571         return fdt_path_offset(blob, prop);
 572 }
 573
 574 int fdtdec_check_fdt(void)
 575 {
 576         /*
 577          * We must have an FDT, but we cannot panic() yet since the console
 578          * is not ready. So for now, just assert(). Boards which need an early
 579          * FDT (prior to console ready) will need to make their own
 580          * arrangements and do their own checks.
 581          */
 582         assert(!fdtdec_prepare_fdt());
 583         return 0;
 584 }
 585
 586 /*
 587  * This function is a little odd in that it accesses global data. At some
 588  * point if the architecture board.c files merge this will make more sense.
 589  * Even now, it is common code.
 590  */
 591 int fdtdec_prepare_fdt(void)
 592 {
 593         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 594             fdt_check_header(gd->fdt_blob)) {
 595 #ifdef CONFIG_SPL_BUILD
 596                 puts("Missing DTB\n");
 597 #else
 598                 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");
 599 # ifdef DEBUG
 600                 if (gd->fdt_blob) {
 601                         printf("fdt_blob=%p\n", gd->fdt_blob);
 602                         print_buffer((ulong)gd->fdt_blob, gd->fdt_blob, 4,
 603                                      32, 0);
 604                 }
 605 # endif
 606 #endif
 607                 return -1;
 608         }
 609         return 0;
 610 }
 611
 612 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 613 {
 614         const u32 *phandle;
 615         int lookup;
 616
 617         debug("%s: %s\n", __func__, prop_name);
 618         phandle = fdt_getprop(blob, node, prop_name, NULL);
 619         if (!phandle)
 620                 return -FDT_ERR_NOTFOUND;
 621
 622         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 623         return lookup;
 624 }
 625
 626 /**
 627  * Look up a property in a node and check that it has a minimum length.
 628  *
 629  * @param blob          FDT blob
 630  * @param node          node to examine
 631  * @param prop_name     name of property to find
 632  * @param min_len       minimum property length in bytes
 633  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 634                         found, or -FDT_ERR_BADLAYOUT if not enough data
 635  * @return pointer to cell, which is only valid if err == 0
 636  */
 637 static const void *get_prop_check_min_len(const void *blob, int node,
 638                 const char *prop_name, int min_len, int *err)
 639 {
 640         const void *cell;
 641         int len;
 642
 643         debug("%s: %s\n", __func__, prop_name);
 644         cell = fdt_getprop(blob, node, prop_name, &len);
 645         if (!cell)
 646                 *err = -FDT_ERR_NOTFOUND;
 647         else if (len < min_len)
 648                 *err = -FDT_ERR_BADLAYOUT;
 649         else
 650                 *err = 0;
 651         return cell;
 652 }
 653
 654 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 655                 u32 *array, int count)
 656 {
 657         const u32 *cell;
 658         int i, err = 0;
 659
 660         debug("%s: %s\n", __func__, prop_name);
 661         cell = get_prop_check_min_len(blob, node, prop_name,
 662                                       sizeof(u32) * count, &err);
 663         if (!err) {
 664                 for (i = 0; i < count; i++)
 665                         array[i] = fdt32_to_cpu(cell[i]);
 666         }
 667         return err;
 668 }
 669
 670 int fdtdec_get_int_array_count(const void *blob, int node,
 671                                const char *prop_name, u32 *array, int count)
 672 {
 673         const u32 *cell;
 674         int len, elems;
 675         int i;
 676
 677         debug("%s: %s\n", __func__, prop_name);
 678         cell = fdt_getprop(blob, node, prop_name, &len);
 679         if (!cell)
 680                 return -FDT_ERR_NOTFOUND;
 681         elems = len / sizeof(u32);
 682         if (count > elems)
 683                 count = elems;
 684         for (i = 0; i < count; i++)
 685                 array[i] = fdt32_to_cpu(cell[i]);
 686
 687         return count;
 688 }
 689
 690 const u32 *fdtdec_locate_array(const void *blob, int node,
 691                                const char *prop_name, int count)
 692 {
 693         const u32 *cell;
 694         int err;
 695
 696         cell = get_prop_check_min_len(blob, node, prop_name,
 697                                       sizeof(u32) * count, &err);
 698         return err ? NULL : cell;
 699 }
 700
 701 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 702 {
 703         const s32 *cell;
 704         int len;
 705
 706         debug("%s: %s\n", __func__, prop_name);
 707         cell = fdt_getprop(blob, node, prop_name, &len);
 708         return cell != NULL;
 709 }
 710
 711 int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
 712                                    const char *list_name,
 713                                    const char *cells_name,
 714                                    int cell_count, int index,
 715                                    struct fdtdec_phandle_args *out_args)
 716 {
 717         const __be32 *list, *list_end;
 718         int rc = 0, size, cur_index = 0;
 719         uint32_t count = 0;
 720         int node = -1;
 721         int phandle;
 722
 723         /* Retrieve the phandle list property */
 724         list = fdt_getprop(blob, src_node, list_name, &size);
 725         if (!list)
 726                 return -ENOENT;
 727         list_end = list + size / sizeof(*list);
 728
 729         /* Loop over the phandles until all the requested entry is found */
 730         while (list < list_end) {
 731                 rc = -EINVAL;
 732                 count = 0;
 733
 734                 /*
 735                  * If phandle is 0, then it is an empty entry with no
 736                  * arguments.  Skip forward to the next entry.
 737                  */
 738                 phandle = be32_to_cpup(list++);
 739                 if (phandle) {
 740                         /*
 741                          * Find the provider node and parse the #*-cells
 742                          * property to determine the argument length.
 743                          *
 744                          * This is not needed if the cell count is hard-coded
 745                          * (i.e. cells_name not set, but cell_count is set),
 746                          * except when we're going to return the found node
 747                          * below.
 748                          */
 749                         if (cells_name || cur_index == index) {
 750                                 node = fdt_node_offset_by_phandle(blob,
 751                                                                   phandle);
 752                                 if (!node) {
 753                                         debug("%s: could not find phandle\n",
 754                                               fdt_get_name(blob, src_node,
 755                                                            NULL));
 756                                         goto err;
 757                                 }
 758                         }
 759
 760                         if (cells_name) {
 761                                 count = fdtdec_get_int(blob, node, cells_name,
 762                                                        -1);
 763                                 if (count == -1) {
 764                                         debug("%s: could not get %s for %s\n",
 765                                               fdt_get_name(blob, src_node,
 766                                                            NULL),
 767                                               cells_name,
 768                                               fdt_get_name(blob, node,
 769                                                            NULL));
 770                                         goto err;
 771                                 }
 772                         } else {
 773                                 count = cell_count;
 774                         }
 775
 776                         /*
 777                          * Make sure that the arguments actually fit in the
 778                          * remaining property data length
 779                          */
 780                         if (list + count > list_end) {
 781                                 debug("%s: arguments longer than property\n",
 782                                       fdt_get_name(blob, src_node, NULL));
 783                                 goto err;
 784                         }
 785                 }
 786
 787                 /*
 788                  * All of the error cases above bail out of the loop, so at
 789                  * this point, the parsing is successful. If the requested
 790                  * index matches, then fill the out_args structure and return,
 791                  * or return -ENOENT for an empty entry.
 792                  */
 793                 rc = -ENOENT;
 794                 if (cur_index == index) {
 795                         if (!phandle)
 796                                 goto err;
 797
 798                         if (out_args) {
 799                                 int i;
 800
 801                                 if (count > MAX_PHANDLE_ARGS) {
 802                                         debug("%s: too many arguments %d\n",
 803                                               fdt_get_name(blob, src_node,
 804                                                            NULL), count);
 805                                         count = MAX_PHANDLE_ARGS;
 806                                 }
 807                                 out_args->node = node;
 808                                 out_args->args_count = count;
 809                                 for (i = 0; i < count; i++) {
 810                                         out_args->args[i] =
 811                                                         be32_to_cpup(list++);
 812                                 }
 813                         }
 814
 815                         /* Found it! return success */
 816                         return 0;
 817                 }
 818
 819                 node = -1;
 820                 list += count;
 821                 cur_index++;
 822         }
 823
 824         /*
 825          * Result will be one of:
 826          * -ENOENT : index is for empty phandle
 827          * -EINVAL : parsing error on data
 828          * [1..n]  : Number of phandle (count mode; when index = -1)
 829          */
 830         rc = index < 0 ? cur_index : -ENOENT;
 831  err:
 832         return rc;
 833 }
 834
 835 int fdtdec_get_child_count(const void *blob, int node)
 836 {
 837         int subnode;
 838         int num = 0;
 839
 840         fdt_for_each_subnode(blob, subnode, node)
 841                 num++;
 842
 843         return num;
 844 }
 845
 846 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 847                 u8 *array, int count)
 848 {
 849         const u8 *cell;
 850         int err;
 851
 852         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 853         if (!err)
 854                 memcpy(array, cell, count);
 855         return err;
 856 }
 857
 858 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 859                              const char *prop_name, int count)
 860 {
 861         const u8 *cell;
 862         int err;
 863
 864         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 865         if (err)
 866                 return NULL;
 867         return cell;
 868 }
 869
 870 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 871                 int default_val)
 872 {
 873         int config_node;
 874
 875         debug("%s: %s\n", __func__, prop_name);
 876         config_node = fdt_path_offset(blob, "/config");
 877         if (config_node < 0)
 878                 return default_val;
 879         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 880 }
 881
 882 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 883 {
 884         int config_node;
 885         const void *prop;
 886
 887         debug("%s: %s\n", __func__, prop_name);
 888         config_node = fdt_path_offset(blob, "/config");
 889         if (config_node < 0)
 890                 return 0;
 891         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 892
 893         return prop != NULL;
 894 }
 895
 896 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 897 {
 898         const char *nodep;
 899         int nodeoffset;
 900         int len;
 901
 902         debug("%s: %s\n", __func__, prop_name);
 903         nodeoffset = fdt_path_offset(blob, "/config");
 904         if (nodeoffset < 0)
 905                 return NULL;
 906
 907         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 908         if (!nodep)
 909                 return NULL;
 910
 911         return (char *)nodep;
 912 }
 913
 914 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
 915                          fdt_addr_t *basep, fdt_size_t *sizep)
 916 {
 917         const fdt_addr_t *cell;
 918         int len;
 919
 920         debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL),
 921               prop_name);
 922         cell = fdt_getprop(blob, node, prop_name, &len);
 923         if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
 924                 debug("cell=%p, len=%d\n", cell, len);
 925                 return -1;
 926         }
 927
 928         *basep = fdt_addr_to_cpu(*cell);
 929         *sizep = fdt_size_to_cpu(cell[1]);
 930         debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
 931               (ulong)*sizep);
 932
 933         return 0;
 934 }
 935
 936 /**
 937  * Read a flash entry from the fdt
 938  *
 939  * @param blob          FDT blob
 940  * @param node          Offset of node to read
 941  * @param name          Name of node being read
 942  * @param entry         Place to put offset and size of this node
 943  * @return 0 if ok, -ve on error
 944  */
 945 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
 946                            struct fmap_entry *entry)
 947 {
 948         const char *prop;
 949         u32 reg[2];
 950
 951         if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
 952                 debug("Node '%s' has bad/missing 'reg' property\n", name);
 953                 return -FDT_ERR_NOTFOUND;
 954         }
 955         entry->offset = reg[0];
 956         entry->length = reg[1];
 957         entry->used = fdtdec_get_int(blob, node, "used", entry->length);
 958         prop = fdt_getprop(blob, node, "compress", NULL);
 959         entry->compress_algo = prop && !strcmp(prop, "lzo") ?
 960                 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE;
 961         prop = fdt_getprop(blob, node, "hash", &entry->hash_size);
 962         entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
 963         entry->hash = (uint8_t *)prop;
 964
 965         return 0;
 966 }
 967
 968 u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
 969 {
 970         u64 number = 0;
 971
 972         while (cells--)
 973                 number = (number << 32) | fdt32_to_cpu(*ptr++);
 974
 975         return number;
 976 }
 977
 978 int fdt_get_resource(const void *fdt, int node, const char *property,
 979                      unsigned int index, struct fdt_resource *res)
 980 {
 981         const fdt32_t *ptr, *end;
 982         int na, ns, len, parent;
 983         unsigned int i = 0;
 984
 985         parent = fdt_parent_offset(fdt, node);
 986         if (parent < 0)
 987                 return parent;
 988
 989         na = fdt_address_cells(fdt, parent);
 990         ns = fdt_size_cells(fdt, parent);
 991
 992         ptr = fdt_getprop(fdt, node, property, &len);
 993         if (!ptr)
 994                 return len;
 995
 996         end = ptr + len / sizeof(*ptr);
 997
 998         while (ptr + na + ns <= end) {
 999                 if (i == index) {
1000                         res->start = res->end = fdtdec_get_number(ptr, na);
1001                         res->end += fdtdec_get_number(&ptr[na], ns) - 1;
1002                         return 0;
1003                 }
1004
1005                 ptr += na + ns;
1006                 i++;
1007         }
1008
1009         return -FDT_ERR_NOTFOUND;
1010 }
1011
1012 int fdt_get_named_resource(const void *fdt, int node, const char *property,
1013                            const char *prop_names, const char *name,
1014                            struct fdt_resource *res)
1015 {
1016         int index;
1017
1018         index = fdt_find_string(fdt, node, prop_names, name);
1019         if (index < 0)
1020                 return index;
1021
1022         return fdt_get_resource(fdt, node, property, index, res);
1023 }
1024
1025 int fdtdec_decode_memory_region(const void *blob, int config_node,
1026                                 const char *mem_type, const char *suffix,
1027                                 fdt_addr_t *basep, fdt_size_t *sizep)
1028 {
1029         char prop_name[50];
1030         const char *mem;
1031         fdt_size_t size, offset_size;
1032         fdt_addr_t base, offset;
1033         int node;
1034
1035         if (config_node == -1) {
1036                 config_node = fdt_path_offset(blob, "/config");
1037                 if (config_node < 0) {
1038                         debug("%s: Cannot find /config node\n", __func__);
1039                         return -ENOENT;
1040                 }
1041         }
1042         if (!suffix)
1043                 suffix = "";
1044
1045         snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
1046                  suffix);
1047         mem = fdt_getprop(blob, config_node, prop_name, NULL);
1048         if (!mem) {
1049                 debug("%s: No memory type for '%s', using /memory\n", __func__,
1050                       prop_name);
1051                 mem = "/memory";
1052         }
1053
1054         node = fdt_path_offset(blob, mem);
1055         if (node < 0) {
1056                 debug("%s: Failed to find node '%s': %s\n", __func__, mem,
1057                       fdt_strerror(node));
1058                 return -ENOENT;
1059         }
1060
1061         /*
1062          * Not strictly correct - the memory may have multiple banks. We just
1063          * use the first
1064          */
1065         if (fdtdec_decode_region(blob, node, "reg", &base, &size)) {
1066                 debug("%s: Failed to decode memory region %s\n", __func__,
1067                       mem);
1068                 return -EINVAL;
1069         }
1070
1071         snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
1072                  suffix);
1073         if (fdtdec_decode_region(blob, config_node, prop_name, &offset,
1074                                  &offset_size)) {
1075                 debug("%s: Failed to decode memory region '%s'\n", __func__,
1076                       prop_name);
1077                 return -EINVAL;
1078         }
1079
1080         *basep = base + offset;
1081         *sizep = offset_size;
1082
1083         return 0;
1084 }
1085
1086 static int decode_timing_property(const void *blob, int node, const char *name,
1087                                   struct timing_entry *result)
1088 {
1089         int length, ret = 0;
1090         const u32 *prop;
1091
1092         prop = fdt_getprop(blob, node, name, &length);
1093         if (!prop) {
1094                 debug("%s: could not find property %s\n",
1095                       fdt_get_name(blob, node, NULL), name);
1096                 return length;
1097         }
1098
1099         if (length == sizeof(u32)) {
1100                 result->typ = fdtdec_get_int(blob, node, name, 0);
1101                 result->min = result->typ;
1102                 result->max = result->typ;
1103         } else {
1104                 ret = fdtdec_get_int_array(blob, node, name, &result->min, 3);
1105         }
1106
1107         return ret;
1108 }
1109
1110 int fdtdec_decode_display_timing(const void *blob, int parent, int index,
1111                                  struct display_timing *dt)
1112 {
1113         int i, node, timings_node;
1114         u32 val = 0;
1115         int ret = 0;
1116
1117         timings_node = fdt_subnode_offset(blob, parent, "display-timings");
1118         if (timings_node < 0)
1119                 return timings_node;
1120
1121         for (i = 0, node = fdt_first_subnode(blob, timings_node);
1122              node > 0 && i != index;
1123              node = fdt_next_subnode(blob, node))
1124                 i++;
1125
1126         if (node < 0)
1127                 return node;
1128
1129         memset(dt, 0, sizeof(*dt));
1130
1131         ret |= decode_timing_property(blob, node, "hback-porch",
1132                                       &dt->hback_porch);
1133         ret |= decode_timing_property(blob, node, "hfront-porch",
1134                                       &dt->hfront_porch);
1135         ret |= decode_timing_property(blob, node, "hactive", &dt->hactive);
1136         ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len);
1137         ret |= decode_timing_property(blob, node, "vback-porch",
1138                                       &dt->vback_porch);
1139         ret |= decode_timing_property(blob, node, "vfront-porch",
1140                                       &dt->vfront_porch);
1141         ret |= decode_timing_property(blob, node, "vactive", &dt->vactive);
1142         ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len);
1143         ret |= decode_timing_property(blob, node, "clock-frequency",
1144                                       &dt->pixelclock);
1145
1146         dt->flags = 0;
1147         val = fdtdec_get_int(blob, node, "vsync-active", -1);
1148         if (val != -1) {
1149                 dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
1150                                 DISPLAY_FLAGS_VSYNC_LOW;
1151         }
1152         val = fdtdec_get_int(blob, node, "hsync-active", -1);
1153         if (val != -1) {
1154                 dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
1155                                 DISPLAY_FLAGS_HSYNC_LOW;
1156         }
1157         val = fdtdec_get_int(blob, node, "de-active", -1);
1158         if (val != -1) {
1159                 dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
1160                                 DISPLAY_FLAGS_DE_LOW;
1161         }
1162         val = fdtdec_get_int(blob, node, "pixelclk-active", -1);
1163         if (val != -1) {
1164                 dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
1165                                 DISPLAY_FLAGS_PIXDATA_NEGEDGE;
1166         }
1167
1168         if (fdtdec_get_bool(blob, node, "interlaced"))
1169                 dt->flags |= DISPLAY_FLAGS_INTERLACED;
1170         if (fdtdec_get_bool(blob, node, "doublescan"))
1171                 dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1172         if (fdtdec_get_bool(blob, node, "doubleclk"))
1173                 dt->flags |= DISPLAY_FLAGS_DOUBLECLK;
1174
1175         return ret;
1176 }
1177
1178 int fdtdec_setup(void)
1179 {
1180 #if CONFIG_IS_ENABLED(OF_CONTROL)
1181 # ifdef CONFIG_OF_EMBED
1182         /* Get a pointer to the FDT */
1183         gd->fdt_blob = __dtb_dt_begin;
1184 # elif defined CONFIG_OF_SEPARATE
1185 #  ifdef CONFIG_SPL_BUILD
1186         /* FDT is at end of BSS unless it is in a different memory region */
1187         if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
1188                 gd->fdt_blob = (ulong *)&_image_binary_end;
1189         else
1190                 gd->fdt_blob = (ulong *)&__bss_end;
1191 #  else
1192         /* FDT is at end of image */
1193         gd->fdt_blob = (ulong *)&_end;
1194 #  endif
1195 # elif defined(CONFIG_OF_HOSTFILE)
1196         if (sandbox_read_fdt_from_file()) {
1197                 puts("Failed to read control FDT\n");
1198                 return -1;
1199         }
1200 # endif
1201 # ifndef CONFIG_SPL_BUILD
1202         /* Allow the early environment to override the fdt address */
1203         gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
1204                                                 (uintptr_t)gd->fdt_blob);
1205 # endif
1206 #endif
1207         return fdtdec_prepare_fdt();
1208 }
1209
1210 #endif /* !USE_HOSTCC */