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; 202 203 prop_val = of_get_address( 204 (struct device_node *)ofnode_to_np(node), index, 205 &size, &flags); 206 if (!prop_val) 207 return FDT_ADDR_T_NONE; 208 return be32_to_cpup(prop_val); 209 } else { 210 return fdt_get_base_address(gd->fdt_blob, 211 ofnode_to_offset(node)); 212 } 213 214 return FDT_ADDR_T_NONE; 215 } 216 217 fdt_addr_t ofnode_get_addr(ofnode node) 218 { 219 return ofnode_get_addr_index(node, 0); 220 } 221 222 int ofnode_stringlist_search(ofnode node, const char *property, 223 const char *string) 224 { 225 if (ofnode_is_np(node)) { 226 return of_property_match_string(ofnode_to_np(node), 227 property, string); 228 } else { 229 int ret; 230 231 ret = fdt_stringlist_search(gd->fdt_blob, 232 ofnode_to_offset(node), property, 233 string); 234 if (ret == -FDT_ERR_NOTFOUND) 235 return -ENODATA; 236 else if (ret < 0) 237 return -EINVAL; 238 239 return ret; 240 } 241 } 242 243 int ofnode_read_string_index(ofnode node, const char *property, int index, 244 const char **outp) 245 { 246 if (ofnode_is_np(node)) { 247 return of_property_read_string_index(ofnode_to_np(node), 248 property, index, outp); 249 } else { 250 int len; 251 252 *outp = fdt_stringlist_get(gd->fdt_blob, ofnode_to_offset(node), 253 property, index, &len); 254 if (len < 0) 255 return -EINVAL; 256 return 0; 257 } 258 } 259 260 int ofnode_read_string_count(ofnode node, const char *property) 261 { 262 if (ofnode_is_np(node)) { 263 return of_property_count_strings(ofnode_to_np(node), property); 264 } else { 265 return fdt_stringlist_count(gd->fdt_blob, 266 ofnode_to_offset(node), property); 267 } 268 } 269 270 static void ofnode_from_fdtdec_phandle_args(struct fdtdec_phandle_args *in, 271 struct ofnode_phandle_args *out) 272 { 273 assert(OF_MAX_PHANDLE_ARGS == MAX_PHANDLE_ARGS); 274 out->node = offset_to_ofnode(in->node); 275 out->args_count = in->args_count; 276 memcpy(out->args, in->args, sizeof(out->args)); 277 } 278 279 static void ofnode_from_of_phandle_args(struct of_phandle_args *in, 280 struct ofnode_phandle_args *out) 281 { 282 assert(OF_MAX_PHANDLE_ARGS == MAX_PHANDLE_ARGS); 283 out->node = np_to_ofnode(in->np); 284 out->args_count = in->args_count; 285 memcpy(out->args, in->args, sizeof(out->args)); 286 } 287 288 int ofnode_parse_phandle_with_args(ofnode node, const char *list_name, 289 const char *cells_name, int cell_count, 290 int index, 291 struct ofnode_phandle_args *out_args) 292 { 293 if (ofnode_is_np(node)) { 294 struct of_phandle_args args; 295 int ret; 296 297 ret = of_parse_phandle_with_args(ofnode_to_np(node), 298 list_name, cells_name, index, &args); 299 if (ret) 300 return ret; 301 ofnode_from_of_phandle_args(&args, out_args); 302 } else { 303 struct fdtdec_phandle_args args; 304 int ret; 305 306 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, 307 ofnode_to_offset(node), list_name, cells_name, 308 cell_count, index, &args); 309 if (ret) 310 return ret; 311 ofnode_from_fdtdec_phandle_args(&args, out_args); 312 } 313 314 return 0; 315 } 316 317 ofnode ofnode_path(const char *path) 318 { 319 if (of_live_active()) 320 return np_to_ofnode(of_find_node_by_path(path)); 321 else 322 return offset_to_ofnode(fdt_path_offset(gd->fdt_blob, path)); 323 } 324 325 const char *ofnode_get_chosen_prop(const char *name) 326 { 327 ofnode chosen_node; 328 329 chosen_node = ofnode_path("/chosen"); 330 331 return ofnode_read_string(chosen_node, name); 332 } 333 334 ofnode ofnode_get_chosen_node(const char *name) 335 { 336 const char *prop; 337 338 prop = ofnode_get_chosen_prop(name); 339 if (!prop) 340 return ofnode_null(); 341 342 return ofnode_path(prop); 343 } 344 345 static int decode_timing_property(ofnode node, const char *name, 346 struct timing_entry *result) 347 { 348 int length, ret = 0; 349 350 length = ofnode_read_size(node, name); 351 if (length < 0) { 352 debug("%s: could not find property %s\n", 353 ofnode_get_name(node), name); 354 return length; 355 } 356 357 if (length == sizeof(u32)) { 358 result->typ = ofnode_read_u32_default(node, name, 0); 359 result->min = result->typ; 360 result->max = result->typ; 361 } else { 362 ret = ofnode_read_u32_array(node, name, &result->min, 3); 363 } 364 365 return ret; 366 } 367 368 int ofnode_decode_display_timing(ofnode parent, int index, 369 struct display_timing *dt) 370 { 371 int i; 372 ofnode timings, node; 373 u32 val = 0; 374 int ret = 0; 375 376 timings = ofnode_find_subnode(parent, "display-timings"); 377 if (!ofnode_valid(timings)) 378 return -EINVAL; 379 380 for (i = 0, node = ofnode_first_subnode(timings); 381 ofnode_valid(node) && i != index; 382 node = ofnode_first_subnode(node)) 383 i++; 384 385 if (!ofnode_valid(node)) 386 return -EINVAL; 387 388 memset(dt, 0, sizeof(*dt)); 389 390 ret |= decode_timing_property(node, "hback-porch", &dt->hback_porch); 391 ret |= decode_timing_property(node, "hfront-porch", &dt->hfront_porch); 392 ret |= decode_timing_property(node, "hactive", &dt->hactive); 393 ret |= decode_timing_property(node, "hsync-len", &dt->hsync_len); 394 ret |= decode_timing_property(node, "vback-porch", &dt->vback_porch); 395 ret |= decode_timing_property(node, "vfront-porch", &dt->vfront_porch); 396 ret |= decode_timing_property(node, "vactive", &dt->vactive); 397 ret |= decode_timing_property(node, "vsync-len", &dt->vsync_len); 398 ret |= decode_timing_property(node, "clock-frequency", &dt->pixelclock); 399 400 dt->flags = 0; 401 val = ofnode_read_u32_default(node, "vsync-active", -1); 402 if (val != -1) { 403 dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH : 404 DISPLAY_FLAGS_VSYNC_LOW; 405 } 406 val = ofnode_read_u32_default(node, "hsync-active", -1); 407 if (val != -1) { 408 dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH : 409 DISPLAY_FLAGS_HSYNC_LOW; 410 } 411 val = ofnode_read_u32_default(node, "de-active", -1); 412 if (val != -1) { 413 dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH : 414 DISPLAY_FLAGS_DE_LOW; 415 } 416 val = ofnode_read_u32_default(node, "pixelclk-active", -1); 417 if (val != -1) { 418 dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE : 419 DISPLAY_FLAGS_PIXDATA_NEGEDGE; 420 } 421 422 if (ofnode_read_bool(node, "interlaced")) 423 dt->flags |= DISPLAY_FLAGS_INTERLACED; 424 if (ofnode_read_bool(node, "doublescan")) 425 dt->flags |= DISPLAY_FLAGS_DOUBLESCAN; 426 if (ofnode_read_bool(node, "doubleclk")) 427 dt->flags |= DISPLAY_FLAGS_DOUBLECLK; 428 429 return ret; 430 } 431 432 const void *ofnode_get_property(ofnode node, const char *propname, int *lenp) 433 { 434 if (ofnode_is_np(node)) 435 return of_get_property(ofnode_to_np(node), propname, lenp); 436 else 437 return fdt_getprop(gd->fdt_blob, ofnode_to_offset(node), 438 propname, lenp); 439 } 440 441 bool ofnode_is_available(ofnode node) 442 { 443 if (ofnode_is_np(node)) 444 return of_device_is_available(ofnode_to_np(node)); 445 else 446 return fdtdec_get_is_enabled(gd->fdt_blob, 447 ofnode_to_offset(node)); 448 } 449 450 fdt_addr_t ofnode_get_addr_size(ofnode node, const char *property, 451 fdt_size_t *sizep) 452 { 453 if (ofnode_is_np(node)) { 454 int na, ns; 455 int psize; 456 const struct device_node *np = ofnode_to_np(node); 457 const __be32 *prop = of_get_property(np, "reg", &psize); 458 459 na = of_n_addr_cells(np); 460 ns = of_n_addr_cells(np); 461 *sizep = of_read_number(prop + na, ns); 462 return of_read_number(prop, na); 463 } else { 464 return fdtdec_get_addr_size(gd->fdt_blob, 465 ofnode_to_offset(node), property, 466 sizep); 467 } 468 } 469 470 const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname, 471 size_t sz) 472 { 473 if (ofnode_is_np(node)) { 474 const struct device_node *np = ofnode_to_np(node); 475 int psize; 476 const __be32 *prop = of_get_property(np, propname, &psize); 477 478 if (!prop || sz != psize) 479 return NULL; 480 return (uint8_t *)prop; 481 482 } else { 483 return fdtdec_locate_byte_array(gd->fdt_blob, 484 ofnode_to_offset(node), propname, sz); 485 } 486 } 487 488 int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type, 489 const char *propname, struct fdt_pci_addr *addr) 490 { 491 const fdt32_t *cell; 492 int len; 493 int ret = -ENOENT; 494 495 debug("%s: %s: ", __func__, propname); 496 497 /* 498 * If we follow the pci bus bindings strictly, we should check 499 * the value of the node's parent node's #address-cells and 500 * #size-cells. They need to be 3 and 2 accordingly. However, 501 * for simplicity we skip the check here. 502 */ 503 cell = ofnode_get_property(node, propname, &len); 504 if (!cell) 505 goto fail; 506 507 if ((len % FDT_PCI_REG_SIZE) == 0) { 508 int num = len / FDT_PCI_REG_SIZE; 509 int i; 510 511 for (i = 0; i < num; i++) { 512 debug("pci address #%d: %08lx %08lx %08lx\n", i, 513 (ulong)fdt32_to_cpu(cell[0]), 514 (ulong)fdt32_to_cpu(cell[1]), 515 (ulong)fdt32_to_cpu(cell[2])); 516 if ((fdt32_to_cpu(*cell) & type) == type) { 517 addr->phys_hi = fdt32_to_cpu(cell[0]); 518 addr->phys_mid = fdt32_to_cpu(cell[1]); 519 addr->phys_lo = fdt32_to_cpu(cell[1]); 520 break; 521 } else { 522 cell += (FDT_PCI_ADDR_CELLS + 523 FDT_PCI_SIZE_CELLS); 524 } 525 } 526 527 if (i == num) { 528 ret = -ENXIO; 529 goto fail; 530 } 531 532 return 0; 533 } else { 534 ret = -EINVAL; 535 } 536 537 fail: 538 debug("(not found)\n"); 539 return ret; 540 } 541 542 int ofnode_read_addr_cells(ofnode node) 543 { 544 if (ofnode_is_np(node)) 545 return of_n_addr_cells(ofnode_to_np(node)); 546 else /* NOTE: this call should walk up the parent stack */ 547 return fdt_address_cells(gd->fdt_blob, ofnode_to_offset(node)); 548 } 549 550 int ofnode_read_size_cells(ofnode node) 551 { 552 if (ofnode_is_np(node)) 553 return of_n_size_cells(ofnode_to_np(node)); 554 else /* NOTE: this call should walk up the parent stack */ 555 return fdt_size_cells(gd->fdt_blob, ofnode_to_offset(node)); 556 } 557 558 int ofnode_read_simple_addr_cells(ofnode node) 559 { 560 if (ofnode_is_np(node)) 561 return of_simple_addr_cells(ofnode_to_np(node)); 562 else 563 return fdt_address_cells(gd->fdt_blob, ofnode_to_offset(node)); 564 } 565 566 int ofnode_read_simple_size_cells(ofnode node) 567 { 568 if (ofnode_is_np(node)) 569 return of_simple_size_cells(ofnode_to_np(node)); 570 else 571 return fdt_size_cells(gd->fdt_blob, ofnode_to_offset(node)); 572 } 573 574 bool ofnode_pre_reloc(ofnode node) 575 { 576 if (ofnode_read_bool(node, "u-boot,dm-pre-reloc")) 577 return true; 578 579 #ifdef CONFIG_TPL_BUILD 580 if (ofnode_read_bool(node, "u-boot,dm-tpl")) 581 return true; 582 #elif defined(CONFIG_SPL_BUILD) 583 if (ofnode_read_bool(node, "u-boot,dm-spl")) 584 return true; 585 #else 586 /* 587 * In regular builds individual spl and tpl handling both 588 * count as handled pre-relocation for later second init. 589 */ 590 if (ofnode_read_bool(node, "u-boot,dm-spl") || 591 ofnode_read_bool(node, "u-boot,dm-tpl")) 592 return true; 593 #endif 594 595 return false; 596 } 597 598 int ofnode_read_resource(ofnode node, uint index, struct resource *res) 599 { 600 if (ofnode_is_np(node)) { 601 return of_address_to_resource(ofnode_to_np(node), index, res); 602 } else { 603 struct fdt_resource fres; 604 int ret; 605 606 ret = fdt_get_resource(gd->fdt_blob, ofnode_to_offset(node), 607 "reg", index, &fres); 608 if (ret < 0) 609 return -EINVAL; 610 memset(res, '\0', sizeof(*res)); 611 res->start = fres.start; 612 res->end = fres.end; 613 614 return 0; 615 } 616 } 617