drivers/core/ofnode.c

   1 /*
   2  * Copyright (c) 2017 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <fdtdec.h>
  11 #include <fdt_support.h>
  12 #include <libfdt.h>
  13 #include <dm/of_access.h>
  14 #include <dm/of_addr.h>
  15 #include <dm/ofnode.h>
  16 #include <linux/err.h>
  17 #include <linux/ioport.h>
  18
  19 int ofnode_read_u32(ofnode node, const char *propname, u32 *outp)
  20 {
  21         assert(ofnode_valid(node));
  22         debug("%s: %s: ", __func__, propname);
  23
  24         if (ofnode_is_np(node)) {
  25                 return of_read_u32(ofnode_to_np(node), propname, outp);
  26         } else {
  27                 const fdt32_t *cell;
  28                 int len;
  29
  30                 cell = fdt_getprop(gd->fdt_blob, ofnode_to_offset(node),
  31                                    propname, &len);
  32                 if (!cell || len < sizeof(int)) {
  33                         debug("(not found)\n");
  34                         return -EINVAL;
  35                 }
  36                 *outp = fdt32_to_cpu(cell[0]);
  37         }
  38         debug("%#x (%d)\n", *outp, *outp);
  39
  40         return 0;
  41 }
  42
  43 int ofnode_read_u32_default(ofnode node, const char *propname, u32 def)
  44 {
  45         assert(ofnode_valid(node));
  46         ofnode_read_u32(node, propname, &def);
  47
  48         return def;
  49 }
  50
  51 int ofnode_read_s32_default(ofnode node, const char *propname, s32 def)
  52 {
  53         assert(ofnode_valid(node));
  54         ofnode_read_u32(node, propname, (u32 *)&def);
  55
  56         return def;
  57 }
  58
  59 bool ofnode_read_bool(ofnode node, const char *propname)
  60 {
  61         const void *prop;
  62
  63         assert(ofnode_valid(node));
  64         debug("%s: %s: ", __func__, propname);
  65
  66         prop = ofnode_get_property(node, propname, NULL);
  67
  68         debug("%s\n", prop ? "true" : "false");
  69
  70         return prop ? true : false;
  71 }
  72
  73 const char *ofnode_read_string(ofnode node, const char *propname)
  74 {
  75         const char *str = NULL;
  76         int len = -1;
  77
  78         assert(ofnode_valid(node));
  79         debug("%s: %s: ", __func__, propname);
  80
  81         if (ofnode_is_np(node)) {
  82                 struct property *prop = of_find_property(
  83                                 ofnode_to_np(node), propname, NULL);
  84
  85                 if (prop) {
  86                         str = prop->value;
  87                         len = prop->length;
  88                 }
  89         } else {
  90                 str = fdt_getprop(gd->fdt_blob, ofnode_to_offset(node),
  91                                   propname, &len);
  92         }
  93         if (!str) {
  94                 debug("<not found>\n");
  95                 return NULL;
  96         }
  97         if (strnlen(str, len) >= len) {
  98                 debug("<invalid>\n");
  99                 return NULL;
 100         }
 101         debug("%s\n", str);
 102
 103         return str;
 104 }
 105
 106 ofnode ofnode_find_subnode(ofnode node, const char *subnode_name)
 107 {
 108         ofnode subnode;
 109
 110         assert(ofnode_valid(node));
 111         debug("%s: %s: ", __func__, subnode_name);
 112
 113         if (ofnode_is_np(node)) {
 114                 const struct device_node *np = ofnode_to_np(node);
 115
 116                 for (np = np->child; np; np = np->sibling) {
 117                         if (!strcmp(subnode_name, np->name))
 118                                 break;
 119                 }
 120                 subnode = np_to_ofnode(np);
 121         } else {
 122                 int ooffset = fdt_subnode_offset(gd->fdt_blob,
 123                                 ofnode_to_offset(node), subnode_name);
 124                 subnode = offset_to_ofnode(ooffset);
 125         }
 126         debug("%s\n", ofnode_valid(subnode) ?
 127               ofnode_get_name(subnode) : "<none>");
 128
 129         return subnode;
 130 }
 131
 132 int ofnode_read_u32_array(ofnode node, const char *propname,
 133                           u32 *out_values, size_t sz)
 134 {
 135         assert(ofnode_valid(node));
 136         debug("%s: %s: ", __func__, propname);
 137
 138         if (ofnode_is_np(node)) {
 139                 return of_read_u32_array(ofnode_to_np(node), propname,
 140                                          out_values, sz);
 141         } else {
 142                 return fdtdec_get_int_array(gd->fdt_blob,
 143                                             ofnode_to_offset(node), propname,
 144                                             out_values, sz);
 145         }
 146 }
 147
 148 ofnode ofnode_first_subnode(ofnode node)
 149 {
 150         assert(ofnode_valid(node));
 151         if (ofnode_is_np(node))
 152                 return np_to_ofnode(node.np->child);
 153
 154         return offset_to_ofnode(
 155                 fdt_first_subnode(gd->fdt_blob, ofnode_to_offset(node)));
 156 }
 157
 158 ofnode ofnode_next_subnode(ofnode node)
 159 {
 160         assert(ofnode_valid(node));
 161         if (ofnode_is_np(node))
 162                 return np_to_ofnode(node.np->sibling);
 163
 164         return offset_to_ofnode(
 165                 fdt_next_subnode(gd->fdt_blob, ofnode_to_offset(node)));
 166 }
 167
 168 const char *ofnode_get_name(ofnode node)
 169 {
 170         assert(ofnode_valid(node));
 171         if (ofnode_is_np(node))
 172                 return strrchr(node.np->full_name, '/') + 1;
 173
 174         return fdt_get_name(gd->fdt_blob, ofnode_to_offset(node), NULL);
 175 }
 176
 177 int ofnode_read_size(ofnode node, const char *propname)
 178 {
 179         int len;
 180
 181         if (ofnode_is_np(node)) {
 182                 struct property *prop = of_find_property(
 183                                 ofnode_to_np(node), propname, NULL);
 184
 185                 if (prop)
 186                         return prop->length;
 187         } else {
 188                 if (fdt_getprop(gd->fdt_blob, ofnode_to_offset(node), propname,
 189                                 &len))
 190                         return len;
 191         }
 192
 193         return -EINVAL;
 194 }
 195
 196 fdt_addr_t ofnode_get_addr_index(ofnode node, int index)
 197 {
 198         if (ofnode_is_np(node)) {
 199                 const __be32 *prop_val;
 200                 uint flags;
 201                 u64 size;
 202                 int na;
 203
 204                 prop_val = of_get_address(ofnode_to_np(node), index, &size,
 205                                           &flags);
 206                 if (!prop_val)
 207                         return FDT_ADDR_T_NONE;
 208
 209                 if (IS_ENABLED(CONFIG_OF_TRANSLATE)) {
 210                         return of_translate_address(ofnode_to_np(node), prop_val);
 211                 } else {
 212                         na = of_n_addr_cells(ofnode_to_np(node));
 213                         return of_read_number(prop_val, na);
 214                 }
 215         } else {
 216                 return fdt_get_base_address(gd->fdt_blob,
 217                                             ofnode_to_offset(node));
 218         }
 219
 220         return FDT_ADDR_T_NONE;
 221 }
 222
 223 fdt_addr_t ofnode_get_addr(ofnode node)
 224 {
 225         return ofnode_get_addr_index(node, 0);
 226 }
 227
 228 int ofnode_stringlist_search(ofnode node, const char *property,
 229                              const char *string)
 230 {
 231         if (ofnode_is_np(node)) {
 232                 return of_property_match_string(ofnode_to_np(node),
 233                                                 property, string);
 234         } else {
 235                 int ret;
 236
 237                 ret = fdt_stringlist_search(gd->fdt_blob,
 238                                             ofnode_to_offset(node), property,
 239                                             string);
 240                 if (ret == -FDT_ERR_NOTFOUND)
 241                         return -ENODATA;
 242                 else if (ret < 0)
 243                         return -EINVAL;
 244
 245                 return ret;
 246         }
 247 }
 248
 249 int ofnode_read_string_index(ofnode node, const char *property, int index,
 250                              const char **outp)
 251 {
 252         if (ofnode_is_np(node)) {
 253                 return of_property_read_string_index(ofnode_to_np(node),
 254                                                      property, index, outp);
 255         } else {
 256                 int len;
 257
 258                 *outp = fdt_stringlist_get(gd->fdt_blob, ofnode_to_offset(node),
 259                                            property, index, &len);
 260                 if (len < 0)
 261                         return -EINVAL;
 262                 return 0;
 263         }
 264 }
 265
 266 int ofnode_read_string_count(ofnode node, const char *property)
 267 {
 268         if (ofnode_is_np(node)) {
 269                 return of_property_count_strings(ofnode_to_np(node), property);
 270         } else {
 271                 return fdt_stringlist_count(gd->fdt_blob,
 272                                             ofnode_to_offset(node), property);
 273         }
 274 }
 275
 276 static void ofnode_from_fdtdec_phandle_args(struct fdtdec_phandle_args *in,
 277                                             struct ofnode_phandle_args *out)
 278 {
 279         assert(OF_MAX_PHANDLE_ARGS == MAX_PHANDLE_ARGS);
 280         out->node = offset_to_ofnode(in->node);
 281         out->args_count = in->args_count;
 282         memcpy(out->args, in->args, sizeof(out->args));
 283 }
 284
 285 static void ofnode_from_of_phandle_args(struct of_phandle_args *in,
 286                                         struct ofnode_phandle_args *out)
 287 {
 288         assert(OF_MAX_PHANDLE_ARGS == MAX_PHANDLE_ARGS);
 289         out->node = np_to_ofnode(in->np);
 290         out->args_count = in->args_count;
 291         memcpy(out->args, in->args, sizeof(out->args));
 292 }
 293
 294 int ofnode_parse_phandle_with_args(ofnode node, const char *list_name,
 295                                    const char *cells_name, int cell_count,
 296                                    int index,
 297                                    struct ofnode_phandle_args *out_args)
 298 {
 299         if (ofnode_is_np(node)) {
 300                 struct of_phandle_args args;
 301                 int ret;
 302
 303                 ret = of_parse_phandle_with_args(ofnode_to_np(node),
 304                                                  list_name, cells_name, index,
 305                                                  &args);
 306                 if (ret)
 307                         return ret;
 308                 ofnode_from_of_phandle_args(&args, out_args);
 309         } else {
 310                 struct fdtdec_phandle_args args;
 311                 int ret;
 312
 313                 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob,
 314                                                      ofnode_to_offset(node),
 315                                                      list_name, cells_name,
 316                                                      cell_count, index, &args);
 317                 if (ret)
 318                         return ret;
 319                 ofnode_from_fdtdec_phandle_args(&args, out_args);
 320         }
 321
 322         return 0;
 323 }
 324
 325 int ofnode_count_phandle_with_args(ofnode node, const char *list_name,
 326                                    const char *cells_name)
 327 {
 328         if (ofnode_is_np(node))
 329                 return of_count_phandle_with_args(ofnode_to_np(node),
 330                                 list_name, cells_name);
 331         else
 332                 return fdtdec_parse_phandle_with_args(gd->fdt_blob,
 333                                 ofnode_to_offset(node), list_name, cells_name,
 334                                 0, -1, NULL);
 335 }
 336
 337 ofnode ofnode_path(const char *path)
 338 {
 339         if (of_live_active())
 340                 return np_to_ofnode(of_find_node_by_path(path));
 341         else
 342                 return offset_to_ofnode(fdt_path_offset(gd->fdt_blob, path));
 343 }
 344
 345 const char *ofnode_get_chosen_prop(const char *name)
 346 {
 347         ofnode chosen_node;
 348
 349         chosen_node = ofnode_path("/chosen");
 350
 351         return ofnode_read_string(chosen_node, name);
 352 }
 353
 354 ofnode ofnode_get_chosen_node(const char *name)
 355 {
 356         const char *prop;
 357
 358         prop = ofnode_get_chosen_prop(name);
 359         if (!prop)
 360                 return ofnode_null();
 361
 362         return ofnode_path(prop);
 363 }
 364
 365 static int decode_timing_property(ofnode node, const char *name,
 366                                   struct timing_entry *result)
 367 {
 368         int length, ret = 0;
 369
 370         length = ofnode_read_size(node, name);
 371         if (length < 0) {
 372                 debug("%s: could not find property %s\n",
 373                       ofnode_get_name(node), name);
 374                 return length;
 375         }
 376
 377         if (length == sizeof(u32)) {
 378                 result->typ = ofnode_read_u32_default(node, name, 0);
 379                 result->min = result->typ;
 380                 result->max = result->typ;
 381         } else {
 382                 ret = ofnode_read_u32_array(node, name, &result->min, 3);
 383         }
 384
 385         return ret;
 386 }
 387
 388 int ofnode_decode_display_timing(ofnode parent, int index,
 389                                  struct display_timing *dt)
 390 {
 391         int i;
 392         ofnode timings, node;
 393         u32 val = 0;
 394         int ret = 0;
 395
 396         timings = ofnode_find_subnode(parent, "display-timings");
 397         if (!ofnode_valid(timings))
 398                 return -EINVAL;
 399
 400         i = 0;
 401         ofnode_for_each_subnode(node, timings) {
 402                 if (i++ == index)
 403                         break;
 404         }
 405
 406         if (!ofnode_valid(node))
 407                 return -EINVAL;
 408
 409         memset(dt, 0, sizeof(*dt));
 410
 411         ret |= decode_timing_property(node, "hback-porch", &dt->hback_porch);
 412         ret |= decode_timing_property(node, "hfront-porch", &dt->hfront_porch);
 413         ret |= decode_timing_property(node, "hactive", &dt->hactive);
 414         ret |= decode_timing_property(node, "hsync-len", &dt->hsync_len);
 415         ret |= decode_timing_property(node, "vback-porch", &dt->vback_porch);
 416         ret |= decode_timing_property(node, "vfront-porch", &dt->vfront_porch);
 417         ret |= decode_timing_property(node, "vactive", &dt->vactive);
 418         ret |= decode_timing_property(node, "vsync-len", &dt->vsync_len);
 419         ret |= decode_timing_property(node, "clock-frequency", &dt->pixelclock);
 420
 421         dt->flags = 0;
 422         val = ofnode_read_u32_default(node, "vsync-active", -1);
 423         if (val != -1) {
 424                 dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
 425                                 DISPLAY_FLAGS_VSYNC_LOW;
 426         }
 427         val = ofnode_read_u32_default(node, "hsync-active", -1);
 428         if (val != -1) {
 429                 dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
 430                                 DISPLAY_FLAGS_HSYNC_LOW;
 431         }
 432         val = ofnode_read_u32_default(node, "de-active", -1);
 433         if (val != -1) {
 434                 dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
 435                                 DISPLAY_FLAGS_DE_LOW;
 436         }
 437         val = ofnode_read_u32_default(node, "pixelclk-active", -1);
 438         if (val != -1) {
 439                 dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
 440                                 DISPLAY_FLAGS_PIXDATA_NEGEDGE;
 441         }
 442
 443         if (ofnode_read_bool(node, "interlaced"))
 444                 dt->flags |= DISPLAY_FLAGS_INTERLACED;
 445         if (ofnode_read_bool(node, "doublescan"))
 446                 dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
 447         if (ofnode_read_bool(node, "doubleclk"))
 448                 dt->flags |= DISPLAY_FLAGS_DOUBLECLK;
 449
 450         return ret;
 451 }
 452
 453 const void *ofnode_get_property(ofnode node, const char *propname, int *lenp)
 454 {
 455         if (ofnode_is_np(node))
 456                 return of_get_property(ofnode_to_np(node), propname, lenp);
 457         else
 458                 return fdt_getprop(gd->fdt_blob, ofnode_to_offset(node),
 459                                    propname, lenp);
 460 }
 461
 462 bool ofnode_is_available(ofnode node)
 463 {
 464         if (ofnode_is_np(node))
 465                 return of_device_is_available(ofnode_to_np(node));
 466         else
 467                 return fdtdec_get_is_enabled(gd->fdt_blob,
 468                                              ofnode_to_offset(node));
 469 }
 470
 471 fdt_addr_t ofnode_get_addr_size(ofnode node, const char *property,
 472                                 fdt_size_t *sizep)
 473 {
 474         if (ofnode_is_np(node)) {
 475                 int na, ns;
 476                 int psize;
 477                 const struct device_node *np = ofnode_to_np(node);
 478                 const __be32 *prop = of_get_property(np, property, &psize);
 479
 480                 if (!prop)
 481                         return FDT_ADDR_T_NONE;
 482                 na = of_n_addr_cells(np);
 483                 ns = of_n_addr_cells(np);
 484                 *sizep = of_read_number(prop + na, ns);
 485                 return of_read_number(prop, na);
 486         } else {
 487                 return fdtdec_get_addr_size(gd->fdt_blob,
 488                                             ofnode_to_offset(node), property,
 489                                             sizep);
 490         }
 491 }
 492
 493 const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
 494                                         size_t sz)
 495 {
 496         if (ofnode_is_np(node)) {
 497                 const struct device_node *np = ofnode_to_np(node);
 498                 int psize;
 499                 const __be32 *prop = of_get_property(np, propname, &psize);
 500
 501                 if (!prop || sz != psize)
 502                         return NULL;
 503                 return (uint8_t *)prop;
 504
 505         } else {
 506                 return fdtdec_locate_byte_array(gd->fdt_blob,
 507                                 ofnode_to_offset(node), propname, sz);
 508         }
 509 }
 510
 511 int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
 512                          const char *propname, struct fdt_pci_addr *addr)
 513 {
 514         const fdt32_t *cell;
 515         int len;
 516         int ret = -ENOENT;
 517
 518         debug("%s: %s: ", __func__, propname);
 519
 520         /*
 521          * If we follow the pci bus bindings strictly, we should check
 522          * the value of the node's parent node's #address-cells and
 523          * #size-cells. They need to be 3 and 2 accordingly. However,
 524          * for simplicity we skip the check here.
 525          */
 526         cell = ofnode_get_property(node, propname, &len);
 527         if (!cell)
 528                 goto fail;
 529
 530         if ((len % FDT_PCI_REG_SIZE) == 0) {
 531                 int num = len / FDT_PCI_REG_SIZE;
 532                 int i;
 533
 534                 for (i = 0; i < num; i++) {
 535                         debug("pci address #%d: %08lx %08lx %08lx\n", i,
 536                               (ulong)fdt32_to_cpu(cell[0]),
 537                               (ulong)fdt32_to_cpu(cell[1]),
 538                               (ulong)fdt32_to_cpu(cell[2]));
 539                         if ((fdt32_to_cpu(*cell) & type) == type) {
 540                                 addr->phys_hi = fdt32_to_cpu(cell[0]);
 541                                 addr->phys_mid = fdt32_to_cpu(cell[1]);
 542                                 addr->phys_lo = fdt32_to_cpu(cell[1]);
 543                                 break;
 544                         }
 545
 546                         cell += (FDT_PCI_ADDR_CELLS +
 547                                  FDT_PCI_SIZE_CELLS);
 548                 }
 549
 550                 if (i == num) {
 551                         ret = -ENXIO;
 552                         goto fail;
 553                 }
 554
 555                 return 0;
 556         }
 557
 558         ret = -EINVAL;
 559
 560 fail:
 561         debug("(not found)\n");
 562         return ret;
 563 }
 564
 565 int ofnode_read_addr_cells(ofnode node)
 566 {
 567         if (ofnode_is_np(node))
 568                 return of_n_addr_cells(ofnode_to_np(node));
 569         else  /* NOTE: this call should walk up the parent stack */
 570                 return fdt_address_cells(gd->fdt_blob, ofnode_to_offset(node));
 571 }
 572
 573 int ofnode_read_size_cells(ofnode node)
 574 {
 575         if (ofnode_is_np(node))
 576                 return of_n_size_cells(ofnode_to_np(node));
 577         else  /* NOTE: this call should walk up the parent stack */
 578                 return fdt_size_cells(gd->fdt_blob, ofnode_to_offset(node));
 579 }
 580
 581 int ofnode_read_simple_addr_cells(ofnode node)
 582 {
 583         if (ofnode_is_np(node))
 584                 return of_simple_addr_cells(ofnode_to_np(node));
 585         else
 586                 return fdt_address_cells(gd->fdt_blob, ofnode_to_offset(node));
 587 }
 588
 589 int ofnode_read_simple_size_cells(ofnode node)
 590 {
 591         if (ofnode_is_np(node))
 592                 return of_simple_size_cells(ofnode_to_np(node));
 593         else
 594                 return fdt_size_cells(gd->fdt_blob, ofnode_to_offset(node));
 595 }
 596
 597 bool ofnode_pre_reloc(ofnode node)
 598 {
 599         if (ofnode_read_bool(node, "u-boot,dm-pre-reloc"))
 600                 return true;
 601
 602 #ifdef CONFIG_TPL_BUILD
 603         if (ofnode_read_bool(node, "u-boot,dm-tpl"))
 604                 return true;
 605 #elif defined(CONFIG_SPL_BUILD)
 606         if (ofnode_read_bool(node, "u-boot,dm-spl"))
 607                 return true;
 608 #else
 609         /*
 610          * In regular builds individual spl and tpl handling both
 611          * count as handled pre-relocation for later second init.
 612          */
 613         if (ofnode_read_bool(node, "u-boot,dm-spl") ||
 614             ofnode_read_bool(node, "u-boot,dm-tpl"))
 615                 return true;
 616 #endif
 617
 618         return false;
 619 }
 620
 621 int ofnode_read_resource(ofnode node, uint index, struct resource *res)
 622 {
 623         if (ofnode_is_np(node)) {
 624                 return of_address_to_resource(ofnode_to_np(node), index, res);
 625         } else {
 626                 struct fdt_resource fres;
 627                 int ret;
 628
 629                 ret = fdt_get_resource(gd->fdt_blob, ofnode_to_offset(node),
 630                                        "reg", index, &fres);
 631                 if (ret < 0)
 632                         return -EINVAL;
 633                 memset(res, '\0', sizeof(*res));
 634                 res->start = fres.start;
 635                 res->end = fres.end;
 636
 637                 return 0;
 638         }
 639 }
 640
 641 int ofnode_read_resource_byname(ofnode node, const char *name,
 642                                 struct resource *res)
 643 {
 644         int index;
 645
 646         index = ofnode_stringlist_search(node, "reg-names", name);
 647         if (index < 0)
 648                 return index;
 649
 650         return ofnode_read_resource(node, index, res);
 651 }
 652
 653 u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr)
 654 {
 655         if (ofnode_is_np(node))
 656                 return of_translate_address(ofnode_to_np(node), in_addr);
 657         else
 658                 return fdt_translate_address(gd->fdt_blob, ofnode_to_offset(node), in_addr);
 659 }