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 <linux/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 ofnode ofnode_get_parent(ofnode node) 169 { 170 ofnode parent; 171 172 assert(ofnode_valid(node)); 173 if (ofnode_is_np(node)) 174 parent = np_to_ofnode(of_get_parent(ofnode_to_np(node))); 175 else 176 parent.of_offset = fdt_parent_offset(gd->fdt_blob, 177 ofnode_to_offset(node)); 178 179 return parent; 180 } 181 182 const char *ofnode_get_name(ofnode node) 183 { 184 assert(ofnode_valid(node)); 185 if (ofnode_is_np(node)) 186 return strrchr(node.np->full_name, '/') + 1; 187 188 return fdt_get_name(gd->fdt_blob, ofnode_to_offset(node), NULL); 189 } 190 191 ofnode ofnode_get_by_phandle(uint phandle) 192 { 193 ofnode node; 194 195 if (of_live_active()) 196 node = np_to_ofnode(of_find_node_by_phandle(phandle)); 197 else 198 node.of_offset = fdt_node_offset_by_phandle(gd->fdt_blob, 199 phandle); 200 201 return node; 202 } 203 204 int ofnode_read_size(ofnode node, const char *propname) 205 { 206 int len; 207 208 if (ofnode_is_np(node)) { 209 struct property *prop = of_find_property( 210 ofnode_to_np(node), propname, NULL); 211 212 if (prop) 213 return prop->length; 214 } else { 215 if (fdt_getprop(gd->fdt_blob, ofnode_to_offset(node), propname, 216 &len)) 217 return len; 218 } 219 220 return -EINVAL; 221 } 222 223 fdt_addr_t ofnode_get_addr_index(ofnode node, int index) 224 { 225 if (ofnode_is_np(node)) { 226 const __be32 *prop_val; 227 uint flags; 228 u64 size; 229 int na; 230 231 prop_val = of_get_address(ofnode_to_np(node), index, &size, 232 &flags); 233 if (!prop_val) 234 return FDT_ADDR_T_NONE; 235 236 if (IS_ENABLED(CONFIG_OF_TRANSLATE)) { 237 return of_translate_address(ofnode_to_np(node), prop_val); 238 } else { 239 na = of_n_addr_cells(ofnode_to_np(node)); 240 return of_read_number(prop_val, na); 241 } 242 } else { 243 return fdt_get_base_address(gd->fdt_blob, 244 ofnode_to_offset(node)); 245 } 246 247 return FDT_ADDR_T_NONE; 248 } 249 250 fdt_addr_t ofnode_get_addr(ofnode node) 251 { 252 return ofnode_get_addr_index(node, 0); 253 } 254 255 int ofnode_stringlist_search(ofnode node, const char *property, 256 const char *string) 257 { 258 if (ofnode_is_np(node)) { 259 return of_property_match_string(ofnode_to_np(node), 260 property, string); 261 } else { 262 int ret; 263 264 ret = fdt_stringlist_search(gd->fdt_blob, 265 ofnode_to_offset(node), property, 266 string); 267 if (ret == -FDT_ERR_NOTFOUND) 268 return -ENODATA; 269 else if (ret < 0) 270 return -EINVAL; 271 272 return ret; 273 } 274 } 275 276 int ofnode_read_string_index(ofnode node, const char *property, int index, 277 const char **outp) 278 { 279 if (ofnode_is_np(node)) { 280 return of_property_read_string_index(ofnode_to_np(node), 281 property, index, outp); 282 } else { 283 int len; 284 285 *outp = fdt_stringlist_get(gd->fdt_blob, ofnode_to_offset(node), 286 property, index, &len); 287 if (len < 0) 288 return -EINVAL; 289 return 0; 290 } 291 } 292 293 int ofnode_read_string_count(ofnode node, const char *property) 294 { 295 if (ofnode_is_np(node)) { 296 return of_property_count_strings(ofnode_to_np(node), property); 297 } else { 298 return fdt_stringlist_count(gd->fdt_blob, 299 ofnode_to_offset(node), property); 300 } 301 } 302 303 static void ofnode_from_fdtdec_phandle_args(struct fdtdec_phandle_args *in, 304 struct ofnode_phandle_args *out) 305 { 306 assert(OF_MAX_PHANDLE_ARGS == MAX_PHANDLE_ARGS); 307 out->node = offset_to_ofnode(in->node); 308 out->args_count = in->args_count; 309 memcpy(out->args, in->args, sizeof(out->args)); 310 } 311 312 static void ofnode_from_of_phandle_args(struct of_phandle_args *in, 313 struct ofnode_phandle_args *out) 314 { 315 assert(OF_MAX_PHANDLE_ARGS == MAX_PHANDLE_ARGS); 316 out->node = np_to_ofnode(in->np); 317 out->args_count = in->args_count; 318 memcpy(out->args, in->args, sizeof(out->args)); 319 } 320 321 int ofnode_parse_phandle_with_args(ofnode node, const char *list_name, 322 const char *cells_name, int cell_count, 323 int index, 324 struct ofnode_phandle_args *out_args) 325 { 326 if (ofnode_is_np(node)) { 327 struct of_phandle_args args; 328 int ret; 329 330 ret = of_parse_phandle_with_args(ofnode_to_np(node), 331 list_name, cells_name, index, 332 &args); 333 if (ret) 334 return ret; 335 ofnode_from_of_phandle_args(&args, out_args); 336 } else { 337 struct fdtdec_phandle_args args; 338 int ret; 339 340 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, 341 ofnode_to_offset(node), 342 list_name, cells_name, 343 cell_count, index, &args); 344 if (ret) 345 return ret; 346 ofnode_from_fdtdec_phandle_args(&args, out_args); 347 } 348 349 return 0; 350 } 351 352 int ofnode_count_phandle_with_args(ofnode node, const char *list_name, 353 const char *cells_name) 354 { 355 if (ofnode_is_np(node)) 356 return of_count_phandle_with_args(ofnode_to_np(node), 357 list_name, cells_name); 358 else 359 return fdtdec_parse_phandle_with_args(gd->fdt_blob, 360 ofnode_to_offset(node), list_name, cells_name, 361 0, -1, NULL); 362 } 363 364 ofnode ofnode_path(const char *path) 365 { 366 if (of_live_active()) 367 return np_to_ofnode(of_find_node_by_path(path)); 368 else 369 return offset_to_ofnode(fdt_path_offset(gd->fdt_blob, path)); 370 } 371 372 const char *ofnode_get_chosen_prop(const char *name) 373 { 374 ofnode chosen_node; 375 376 chosen_node = ofnode_path("/chosen"); 377 378 return ofnode_read_string(chosen_node, name); 379 } 380 381 ofnode ofnode_get_chosen_node(const char *name) 382 { 383 const char *prop; 384 385 prop = ofnode_get_chosen_prop(name); 386 if (!prop) 387 return ofnode_null(); 388 389 return ofnode_path(prop); 390 } 391 392 static int decode_timing_property(ofnode node, const char *name, 393 struct timing_entry *result) 394 { 395 int length, ret = 0; 396 397 length = ofnode_read_size(node, name); 398 if (length < 0) { 399 debug("%s: could not find property %s\n", 400 ofnode_get_name(node), name); 401 return length; 402 } 403 404 if (length == sizeof(u32)) { 405 result->typ = ofnode_read_u32_default(node, name, 0); 406 result->min = result->typ; 407 result->max = result->typ; 408 } else { 409 ret = ofnode_read_u32_array(node, name, &result->min, 3); 410 } 411 412 return ret; 413 } 414 415 int ofnode_decode_display_timing(ofnode parent, int index, 416 struct display_timing *dt) 417 { 418 int i; 419 ofnode timings, node; 420 u32 val = 0; 421 int ret = 0; 422 423 timings = ofnode_find_subnode(parent, "display-timings"); 424 if (!ofnode_valid(timings)) 425 return -EINVAL; 426 427 i = 0; 428 ofnode_for_each_subnode(node, timings) { 429 if (i++ == index) 430 break; 431 } 432 433 if (!ofnode_valid(node)) 434 return -EINVAL; 435 436 memset(dt, 0, sizeof(*dt)); 437 438 ret |= decode_timing_property(node, "hback-porch", &dt->hback_porch); 439 ret |= decode_timing_property(node, "hfront-porch", &dt->hfront_porch); 440 ret |= decode_timing_property(node, "hactive", &dt->hactive); 441 ret |= decode_timing_property(node, "hsync-len", &dt->hsync_len); 442 ret |= decode_timing_property(node, "vback-porch", &dt->vback_porch); 443 ret |= decode_timing_property(node, "vfront-porch", &dt->vfront_porch); 444 ret |= decode_timing_property(node, "vactive", &dt->vactive); 445 ret |= decode_timing_property(node, "vsync-len", &dt->vsync_len); 446 ret |= decode_timing_property(node, "clock-frequency", &dt->pixelclock); 447 448 dt->flags = 0; 449 val = ofnode_read_u32_default(node, "vsync-active", -1); 450 if (val != -1) { 451 dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH : 452 DISPLAY_FLAGS_VSYNC_LOW; 453 } 454 val = ofnode_read_u32_default(node, "hsync-active", -1); 455 if (val != -1) { 456 dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH : 457 DISPLAY_FLAGS_HSYNC_LOW; 458 } 459 val = ofnode_read_u32_default(node, "de-active", -1); 460 if (val != -1) { 461 dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH : 462 DISPLAY_FLAGS_DE_LOW; 463 } 464 val = ofnode_read_u32_default(node, "pixelclk-active", -1); 465 if (val != -1) { 466 dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE : 467 DISPLAY_FLAGS_PIXDATA_NEGEDGE; 468 } 469 470 if (ofnode_read_bool(node, "interlaced")) 471 dt->flags |= DISPLAY_FLAGS_INTERLACED; 472 if (ofnode_read_bool(node, "doublescan")) 473 dt->flags |= DISPLAY_FLAGS_DOUBLESCAN; 474 if (ofnode_read_bool(node, "doubleclk")) 475 dt->flags |= DISPLAY_FLAGS_DOUBLECLK; 476 477 return ret; 478 } 479 480 const void *ofnode_get_property(ofnode node, const char *propname, int *lenp) 481 { 482 if (ofnode_is_np(node)) 483 return of_get_property(ofnode_to_np(node), propname, lenp); 484 else 485 return fdt_getprop(gd->fdt_blob, ofnode_to_offset(node), 486 propname, lenp); 487 } 488 489 bool ofnode_is_available(ofnode node) 490 { 491 if (ofnode_is_np(node)) 492 return of_device_is_available(ofnode_to_np(node)); 493 else 494 return fdtdec_get_is_enabled(gd->fdt_blob, 495 ofnode_to_offset(node)); 496 } 497 498 fdt_addr_t ofnode_get_addr_size(ofnode node, const char *property, 499 fdt_size_t *sizep) 500 { 501 if (ofnode_is_np(node)) { 502 int na, ns; 503 int psize; 504 const struct device_node *np = ofnode_to_np(node); 505 const __be32 *prop = of_get_property(np, property, &psize); 506 507 if (!prop) 508 return FDT_ADDR_T_NONE; 509 na = of_n_addr_cells(np); 510 ns = of_n_addr_cells(np); 511 *sizep = of_read_number(prop + na, ns); 512 return of_read_number(prop, na); 513 } else { 514 return fdtdec_get_addr_size(gd->fdt_blob, 515 ofnode_to_offset(node), property, 516 sizep); 517 } 518 } 519 520 const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname, 521 size_t sz) 522 { 523 if (ofnode_is_np(node)) { 524 const struct device_node *np = ofnode_to_np(node); 525 int psize; 526 const __be32 *prop = of_get_property(np, propname, &psize); 527 528 if (!prop || sz != psize) 529 return NULL; 530 return (uint8_t *)prop; 531 532 } else { 533 return fdtdec_locate_byte_array(gd->fdt_blob, 534 ofnode_to_offset(node), propname, sz); 535 } 536 } 537 538 int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type, 539 const char *propname, struct fdt_pci_addr *addr) 540 { 541 const fdt32_t *cell; 542 int len; 543 int ret = -ENOENT; 544 545 debug("%s: %s: ", __func__, propname); 546 547 /* 548 * If we follow the pci bus bindings strictly, we should check 549 * the value of the node's parent node's #address-cells and 550 * #size-cells. They need to be 3 and 2 accordingly. However, 551 * for simplicity we skip the check here. 552 */ 553 cell = ofnode_get_property(node, propname, &len); 554 if (!cell) 555 goto fail; 556 557 if ((len % FDT_PCI_REG_SIZE) == 0) { 558 int num = len / FDT_PCI_REG_SIZE; 559 int i; 560 561 for (i = 0; i < num; i++) { 562 debug("pci address #%d: %08lx %08lx %08lx\n", i, 563 (ulong)fdt32_to_cpu(cell[0]), 564 (ulong)fdt32_to_cpu(cell[1]), 565 (ulong)fdt32_to_cpu(cell[2])); 566 if ((fdt32_to_cpu(*cell) & type) == type) { 567 addr->phys_hi = fdt32_to_cpu(cell[0]); 568 addr->phys_mid = fdt32_to_cpu(cell[1]); 569 addr->phys_lo = fdt32_to_cpu(cell[1]); 570 break; 571 } 572 573 cell += (FDT_PCI_ADDR_CELLS + 574 FDT_PCI_SIZE_CELLS); 575 } 576 577 if (i == num) { 578 ret = -ENXIO; 579 goto fail; 580 } 581 582 return 0; 583 } 584 585 ret = -EINVAL; 586 587 fail: 588 debug("(not found)\n"); 589 return ret; 590 } 591 592 int ofnode_read_addr_cells(ofnode node) 593 { 594 if (ofnode_is_np(node)) 595 return of_n_addr_cells(ofnode_to_np(node)); 596 else /* NOTE: this call should walk up the parent stack */ 597 return fdt_address_cells(gd->fdt_blob, ofnode_to_offset(node)); 598 } 599 600 int ofnode_read_size_cells(ofnode node) 601 { 602 if (ofnode_is_np(node)) 603 return of_n_size_cells(ofnode_to_np(node)); 604 else /* NOTE: this call should walk up the parent stack */ 605 return fdt_size_cells(gd->fdt_blob, ofnode_to_offset(node)); 606 } 607 608 int ofnode_read_simple_addr_cells(ofnode node) 609 { 610 if (ofnode_is_np(node)) 611 return of_simple_addr_cells(ofnode_to_np(node)); 612 else 613 return fdt_address_cells(gd->fdt_blob, ofnode_to_offset(node)); 614 } 615 616 int ofnode_read_simple_size_cells(ofnode node) 617 { 618 if (ofnode_is_np(node)) 619 return of_simple_size_cells(ofnode_to_np(node)); 620 else 621 return fdt_size_cells(gd->fdt_blob, ofnode_to_offset(node)); 622 } 623 624 bool ofnode_pre_reloc(ofnode node) 625 { 626 if (ofnode_read_bool(node, "u-boot,dm-pre-reloc")) 627 return true; 628 629 #ifdef CONFIG_TPL_BUILD 630 if (ofnode_read_bool(node, "u-boot,dm-tpl")) 631 return true; 632 #elif defined(CONFIG_SPL_BUILD) 633 if (ofnode_read_bool(node, "u-boot,dm-spl")) 634 return true; 635 #else 636 /* 637 * In regular builds individual spl and tpl handling both 638 * count as handled pre-relocation for later second init. 639 */ 640 if (ofnode_read_bool(node, "u-boot,dm-spl") || 641 ofnode_read_bool(node, "u-boot,dm-tpl")) 642 return true; 643 #endif 644 645 return false; 646 } 647 648 int ofnode_read_resource(ofnode node, uint index, struct resource *res) 649 { 650 if (ofnode_is_np(node)) { 651 return of_address_to_resource(ofnode_to_np(node), index, res); 652 } else { 653 struct fdt_resource fres; 654 int ret; 655 656 ret = fdt_get_resource(gd->fdt_blob, ofnode_to_offset(node), 657 "reg", index, &fres); 658 if (ret < 0) 659 return -EINVAL; 660 memset(res, '\0', sizeof(*res)); 661 res->start = fres.start; 662 res->end = fres.end; 663 664 return 0; 665 } 666 } 667 668 int ofnode_read_resource_byname(ofnode node, const char *name, 669 struct resource *res) 670 { 671 int index; 672 673 index = ofnode_stringlist_search(node, "reg-names", name); 674 if (index < 0) 675 return index; 676 677 return ofnode_read_resource(node, index, res); 678 } 679 680 u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr) 681 { 682 if (ofnode_is_np(node)) 683 return of_translate_address(ofnode_to_np(node), in_addr); 684 else 685 return fdt_translate_address(gd->fdt_blob, ofnode_to_offset(node), in_addr); 686 } 687