1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2021, Linaro Limited 4 * Copyright (c) 2021, Bootlin 5 * Copyright (c) 2021, Linaro Limited 6 * Copyright (c) 2021, STMicroelectronics 7 */ 8 9 #include <assert.h> 10 #include <config.h> 11 #include <initcall.h> 12 #include <kernel/boot.h> 13 #include <kernel/dt.h> 14 #include <kernel/dt_driver.h> 15 #include <libfdt.h> 16 #include <malloc.h> 17 #include <sys/queue.h> 18 #include <tee_api_defines_extensions.h> 19 #include <tee_api_types.h> 20 21 /* 22 * struct dt_driver_probe - Node instance in secure FDT to probe a driver for 23 * 24 * @link: List hook 25 * @nodeoffset: Node offset of device referenced in the FDT 26 * @type: One of DT_DRIVER_* or DT_DRIVER_NOTYPE. 27 * @deferrals: Driver probe deferrals count 28 * @dt_drv: Matching driver to probe if found or NULL 29 * @dm: Matching reference if applicable or NULL 30 */ 31 struct dt_driver_probe { 32 int nodeoffset; 33 enum dt_driver_type type; 34 unsigned int deferrals; 35 const struct dt_driver *dt_drv; 36 const struct dt_device_match *dm; 37 TAILQ_ENTRY(dt_driver_probe) link; 38 }; 39 40 /* 41 * struct dt_driver_provider - DT related info on probed device 42 * 43 * Saves information on the probed device so that device 44 * drivers can get resources from DT phandle and related arguments. 45 * 46 * @nodeoffset: Node offset of device referenced in the FDT 47 * @type: One of DT_DRIVER_* or DT_DRIVER_NOTYPE. 48 * @provider_cells: Cells count in the FDT used by the driver's references 49 * @get_of_device: Function to get driver's device ref from phandle data 50 * @priv_data: Driver private data passed as @get_of_device argument 51 * @link: Reference in DT driver providers list 52 */ 53 struct dt_driver_provider { 54 int nodeoffset; 55 enum dt_driver_type type; 56 unsigned int provider_cells; 57 uint32_t phandle; 58 get_of_device_func get_of_device; 59 void *priv_data; 60 SLIST_ENTRY(dt_driver_provider) link; 61 }; 62 63 /* 64 * Device driver providers are able to provide a driver specific instance 65 * related to device phandle arguments found in the secure embedded FDT. 66 */ 67 static SLIST_HEAD(, dt_driver_provider) dt_driver_provider_list = 68 SLIST_HEAD_INITIALIZER(dt_driver_provider_list); 69 70 /* FDT nodes for which a matching driver is to be probed */ 71 static TAILQ_HEAD(dt_driver_probe_head, dt_driver_probe) dt_driver_probe_list = 72 TAILQ_HEAD_INITIALIZER(dt_driver_probe_list); 73 74 /* FDT nodes for which a matching driver has been successfully probed */ 75 static TAILQ_HEAD(, dt_driver_probe) dt_driver_ready_list = 76 TAILQ_HEAD_INITIALIZER(dt_driver_ready_list); 77 78 /* List of the nodes for which a compatible driver but reported a failure */ 79 static TAILQ_HEAD(, dt_driver_probe) dt_driver_failed_list = 80 TAILQ_HEAD_INITIALIZER(dt_driver_failed_list); 81 82 /* Flag enabled when a new node (possibly typed) is added in the probe list */ 83 static bool added_node; 84 85 /* Resolve drivers dependencies on core crypto layer */ 86 static bool tee_crypt_is_ready; 87 88 void dt_driver_crypt_init_complete(void) 89 { 90 assert(!tee_crypt_is_ready); 91 tee_crypt_is_ready = true; 92 } 93 94 TEE_Result dt_driver_get_crypto(void) 95 { 96 if (tee_crypt_is_ready) 97 return TEE_SUCCESS; 98 else 99 return TEE_ERROR_DEFER_DRIVER_INIT; 100 } 101 102 static void assert_type_is_valid(enum dt_driver_type type) 103 { 104 switch (type) { 105 case DT_DRIVER_NOTYPE: 106 case DT_DRIVER_CLK: 107 case DT_DRIVER_RSTCTRL: 108 case DT_DRIVER_UART: 109 case DT_DRIVER_GPIO: 110 case DT_DRIVER_I2C: 111 case DT_DRIVER_PINCTRL: 112 case DT_DRIVER_INTERRUPT: 113 case DT_DRIVER_REGULATOR: 114 return; 115 default: 116 assert(0); 117 } 118 } 119 120 /* 121 * Driver provider registering API functions 122 */ 123 124 TEE_Result dt_driver_register_provider(const void *fdt, int nodeoffset, 125 get_of_device_func get_of_device, 126 void *priv, enum dt_driver_type type) 127 { 128 struct dt_driver_provider *prv = NULL; 129 int provider_cells = 0; 130 uint32_t phandle = 0; 131 132 assert_type_is_valid(type); 133 134 provider_cells = fdt_get_dt_driver_cells(fdt, nodeoffset, type); 135 if (provider_cells < 0) { 136 DMSG("Failed to find provider cells: %d", provider_cells); 137 return TEE_ERROR_GENERIC; 138 } 139 140 phandle = fdt_get_phandle(fdt, nodeoffset); 141 if (phandle == (uint32_t)-1) { 142 DMSG("Failed to find provide phandle"); 143 return TEE_ERROR_GENERIC; 144 } 145 146 prv = calloc(1, sizeof(*prv)); 147 if (!prv) 148 return TEE_ERROR_OUT_OF_MEMORY; 149 150 prv->nodeoffset = nodeoffset; 151 prv->type = type; 152 prv->provider_cells = provider_cells; 153 prv->phandle = phandle; 154 prv->get_of_device = get_of_device; 155 prv->priv_data = priv; 156 157 SLIST_INSERT_HEAD(&dt_driver_provider_list, prv, link); 158 159 return TEE_SUCCESS; 160 } 161 162 static bool dt_driver_use_parent_controller(enum dt_driver_type type) 163 { 164 switch (type) { 165 case DT_DRIVER_PINCTRL: 166 return true; 167 default: 168 return false; 169 } 170 } 171 172 /* 173 * Helper functions for dt_drivers querying driver provider information 174 */ 175 176 int fdt_get_dt_driver_cells(const void *fdt, int nodeoffset, 177 enum dt_driver_type type) 178 { 179 const char *cells_name = NULL; 180 const fdt32_t *c = NULL; 181 int len = 0; 182 183 if (dt_driver_use_parent_controller(type)) 184 return 0; 185 186 switch (type) { 187 case DT_DRIVER_CLK: 188 cells_name = "#clock-cells"; 189 break; 190 case DT_DRIVER_INTERRUPT: 191 cells_name = "#interrupt-cells"; 192 break; 193 case DT_DRIVER_RSTCTRL: 194 cells_name = "#reset-cells"; 195 break; 196 case DT_DRIVER_GPIO: 197 cells_name = "#gpio-cells"; 198 break; 199 case DT_DRIVER_I2C: 200 case DT_DRIVER_REGULATOR: 201 return 0; 202 default: 203 panic(); 204 } 205 206 c = fdt_getprop(fdt, nodeoffset, cells_name, &len); 207 if (!c) 208 return len; 209 210 if (len != sizeof(*c)) 211 return -FDT_ERR_BADNCELLS; 212 213 return fdt32_to_cpu(*c); 214 } 215 216 unsigned int dt_driver_provider_cells(struct dt_driver_provider *prv) 217 { 218 return prv->provider_cells; 219 } 220 221 void *dt_driver_provider_priv_data(struct dt_driver_provider *prv) 222 { 223 return prv->priv_data; 224 } 225 226 struct dt_driver_provider * 227 dt_driver_get_provider_by_node(int nodeoffset, enum dt_driver_type type) 228 { 229 struct dt_driver_provider *prv = NULL; 230 231 SLIST_FOREACH(prv, &dt_driver_provider_list, link) 232 if (prv->nodeoffset == nodeoffset && prv->type == type) 233 return prv; 234 235 return NULL; 236 } 237 238 struct dt_driver_provider * 239 dt_driver_get_provider_by_phandle(uint32_t phandle, enum dt_driver_type type) 240 { 241 struct dt_driver_provider *prv = NULL; 242 243 SLIST_FOREACH(prv, &dt_driver_provider_list, link) 244 if (prv->phandle == phandle && prv->type == type) 245 return prv; 246 247 return NULL; 248 } 249 250 static TEE_Result device_from_provider_prop(struct dt_driver_provider *prv, 251 const void *fdt, int phandle_node, 252 const uint32_t *prop, 253 void *device_ref) 254 { 255 TEE_Result res = TEE_ERROR_GENERIC; 256 struct dt_pargs *pargs = NULL; 257 unsigned int n = 0; 258 259 pargs = calloc(1, prv->provider_cells * sizeof(uint32_t *) + 260 sizeof(*pargs)); 261 if (!pargs) 262 return TEE_ERROR_OUT_OF_MEMORY; 263 264 pargs->fdt = fdt; 265 pargs->phandle_node = phandle_node; 266 pargs->args_count = prv->provider_cells; 267 for (n = 0; n < prv->provider_cells; n++) 268 pargs->args[n] = fdt32_to_cpu(prop[n]); 269 270 res = prv->get_of_device(pargs, prv->priv_data, device_ref); 271 272 free(pargs); 273 274 return res; 275 } 276 277 TEE_Result dt_driver_device_from_parent(const void *fdt, int nodeoffset, 278 enum dt_driver_type type, 279 void *device_ref) 280 { 281 int parent = -1; 282 struct dt_driver_provider *prv = NULL; 283 284 assert(fdt == get_secure_dt()); 285 286 parent = fdt_parent_offset(fdt, nodeoffset); 287 if (parent < 0) 288 return TEE_ERROR_GENERIC; 289 290 prv = dt_driver_get_provider_by_node(parent, type); 291 if (!prv) { 292 /* No provider registered yet */ 293 return TEE_ERROR_DEFER_DRIVER_INIT; 294 } 295 296 return device_from_provider_prop(prv, fdt, nodeoffset, NULL, 297 device_ref); 298 } 299 300 TEE_Result dt_driver_device_from_node_idx_prop_phandle(const char *prop_name, 301 const void *fdt, 302 int nodeoffs, 303 unsigned int prop_index, 304 enum dt_driver_type type, 305 uint32_t phandle, 306 void *device_ref) 307 { 308 int len = 0; 309 const uint32_t *prop = NULL; 310 int phandle_node_unused = -1; 311 struct dt_driver_provider *prv = NULL; 312 313 prop = fdt_getprop(fdt, nodeoffs, prop_name, &len); 314 if (!prop) { 315 if (len != -FDT_ERR_NOTFOUND) { 316 DMSG("Corrupted node %s", prop_name); 317 return TEE_ERROR_GENERIC; 318 } else { 319 DMSG("Property %s missing in node %s", prop_name, 320 fdt_get_name(fdt, nodeoffs, NULL)); 321 return TEE_ERROR_ITEM_NOT_FOUND; 322 } 323 } 324 325 prv = dt_driver_get_provider_by_phandle(phandle, type); 326 if (!prv) 327 return TEE_ERROR_DEFER_DRIVER_INIT; 328 329 prop_index *= dt_driver_provider_cells(prv); 330 if ((prop_index + 1) * sizeof(*prop) > (size_t)len) 331 return TEE_ERROR_ITEM_NOT_FOUND; 332 333 return device_from_provider_prop(prv, fdt, phandle_node_unused, 334 prop + prop_index, device_ref); 335 } 336 337 TEE_Result dt_driver_device_from_node_idx_prop(const char *prop_name, 338 const void *fdt, int nodeoffset, 339 unsigned int prop_idx, 340 enum dt_driver_type type, 341 void *device_ref) 342 { 343 int len = 0; 344 int idx = 0; 345 int idx32 = 0; 346 int prv_cells = 0; 347 int phandle_node = -1; 348 uint32_t phandle = 0; 349 const uint32_t *prop = NULL; 350 struct dt_driver_provider *prv = NULL; 351 352 prop = fdt_getprop(fdt, nodeoffset, prop_name, &len); 353 if (!prop) { 354 DMSG("Property %s missing in node %s", prop_name, 355 fdt_get_name(fdt, nodeoffset, NULL)); 356 return TEE_ERROR_ITEM_NOT_FOUND; 357 } 358 359 while (idx < len) { 360 idx32 = idx / sizeof(uint32_t); 361 phandle = fdt32_to_cpu(prop[idx32]); 362 if (!phandle) { 363 if (!prop_idx) 364 break; 365 idx += sizeof(phandle); 366 prop_idx--; 367 continue; 368 } 369 370 /* 371 * In some cases, pinctrl, i2c, nvmem, etc, the consumer phandle 372 * points directly to a subnode of the parent. In such cases, 373 * the provider does not have any "-cells" property and 374 * potentially no "phandle" property. 375 */ 376 if (dt_driver_use_parent_controller(type)) { 377 phandle_node = fdt_node_offset_by_phandle(fdt, phandle); 378 if (phandle_node < 0) 379 return TEE_ERROR_GENERIC; 380 381 nodeoffset = fdt_parent_offset(fdt, phandle_node); 382 if (nodeoffset < 0) 383 return TEE_ERROR_GENERIC; 384 385 prv = dt_driver_get_provider_by_node(nodeoffset, type); 386 if (!prv) 387 return TEE_ERROR_DEFER_DRIVER_INIT; 388 } else { 389 prv = dt_driver_get_provider_by_phandle(phandle, type); 390 if (!prv) 391 return TEE_ERROR_DEFER_DRIVER_INIT; 392 } 393 394 prv_cells = dt_driver_provider_cells(prv); 395 if (prop_idx) { 396 prop_idx--; 397 idx += sizeof(phandle) + prv_cells * sizeof(uint32_t); 398 continue; 399 } 400 401 /* Skip property cell with the phandle, already handled */ 402 idx32++; 403 404 return device_from_provider_prop(prv, fdt, phandle_node, 405 prop + idx32, device_ref); 406 } 407 408 return TEE_ERROR_ITEM_NOT_FOUND; 409 } 410 411 static void __maybe_unused print_probe_list(const void *fdt __maybe_unused) 412 { 413 struct dt_driver_probe *elt = NULL; 414 unsigned int count = 0; 415 416 TAILQ_FOREACH(elt, &dt_driver_probe_list, link) 417 count++; 418 419 DMSG("Probe list: %u elements", count); 420 TAILQ_FOREACH(elt, &dt_driver_probe_list, link) 421 DMSG("|- Driver %s probes on node %s", 422 elt->dt_drv->name, 423 fdt_get_name(fdt, elt->nodeoffset, NULL)); 424 425 DMSG("`- Probe list end"); 426 427 count = 0; 428 TAILQ_FOREACH(elt, &dt_driver_failed_list, link) 429 count++; 430 431 DMSG("Failed list: %u elements", count); 432 TAILQ_FOREACH(elt, &dt_driver_failed_list, link) 433 EMSG("|- Driver %s on node %s failed", elt->dt_drv->name, 434 fdt_get_name(fdt, elt->nodeoffset, NULL)); 435 436 DMSG("`- Failed list end"); 437 } 438 439 /* 440 * Probe element: push to ready list if succeeds, push to probe list if probe 441 * if deferred, panic with an error trace otherwise. 442 */ 443 static TEE_Result probe_driver_node(const void *fdt, 444 struct dt_driver_probe *elt) 445 { 446 TEE_Result res = TEE_ERROR_GENERIC; 447 const char __maybe_unused *drv_name = NULL; 448 const char __maybe_unused *node_name = NULL; 449 450 node_name = fdt_get_name(fdt, elt->nodeoffset, NULL); 451 drv_name = elt->dt_drv->name; 452 453 if (!elt->dt_drv->probe) { 454 DMSG("No probe operator for driver %s, skipped", drv_name); 455 return TEE_SUCCESS; 456 } 457 458 FMSG("Probing %s on node %s", drv_name, node_name); 459 460 res = elt->dt_drv->probe(fdt, elt->nodeoffset, elt->dm->compat_data); 461 switch (res) { 462 case TEE_SUCCESS: 463 TAILQ_INSERT_HEAD(&dt_driver_ready_list, elt, link); 464 465 DMSG("element: %s on node %s initialized", drv_name, node_name); 466 break; 467 case TEE_ERROR_DEFER_DRIVER_INIT: 468 elt->deferrals++; 469 TAILQ_INSERT_TAIL(&dt_driver_probe_list, elt, link); 470 471 DMSG("element: %s on node %s deferred %u time(s)", drv_name, 472 node_name, elt->deferrals); 473 break; 474 case TEE_ERROR_NODE_DISABLED: 475 DMSG("element: %s on node %s is disabled", drv_name, node_name); 476 break; 477 default: 478 TAILQ_INSERT_HEAD(&dt_driver_failed_list, elt, link); 479 480 EMSG("Failed to probe %s on node %s: %#"PRIx32, 481 drv_name, node_name, res); 482 break; 483 } 484 485 return res; 486 } 487 488 static TEE_Result alloc_elt_and_probe(const void *fdt, int node, 489 const struct dt_driver *dt_drv, 490 const struct dt_device_match *dm) 491 { 492 struct dt_driver_probe *elt = NULL; 493 494 /* Will be freed when lists are released */ 495 elt = calloc(1, sizeof(*elt)); 496 if (!elt) 497 return TEE_ERROR_OUT_OF_MEMORY; 498 499 elt->nodeoffset = node; 500 elt->dt_drv = dt_drv; 501 elt->dm = dm; 502 elt->type = dt_drv->type; 503 504 return probe_driver_node(fdt, elt); 505 } 506 507 /* Lookup a compatible driver, possibly of a specific @type, for the FDT node */ 508 static TEE_Result probe_device_by_compat(const void *fdt, int node, 509 const char *compat, 510 enum dt_driver_type type) 511 { 512 const struct dt_driver *drv = NULL; 513 const struct dt_device_match *dm = NULL; 514 515 for_each_dt_driver(drv) { 516 if (drv->type != type) 517 continue; 518 519 for (dm = drv->match_table; dm && dm->compatible; dm++) 520 if (strcmp(dm->compatible, compat) == 0) 521 return alloc_elt_and_probe(fdt, node, drv, dm); 522 } 523 524 return TEE_ERROR_ITEM_NOT_FOUND; 525 } 526 527 /* 528 * Lookup the best matching compatible driver, possibly of a specific @type, 529 * for the FDT node. 530 */ 531 TEE_Result dt_driver_probe_device_by_node(const void *fdt, int nodeoffset, 532 enum dt_driver_type type) 533 { 534 int idx = 0; 535 int len = 0; 536 int count = 0; 537 const char *compat = NULL; 538 TEE_Result res = TEE_ERROR_GENERIC; 539 540 assert_type_is_valid(type); 541 542 count = fdt_stringlist_count(fdt, nodeoffset, "compatible"); 543 if (count < 0) 544 return TEE_ERROR_ITEM_NOT_FOUND; 545 546 for (idx = 0; idx < count; idx++) { 547 compat = fdt_stringlist_get(fdt, nodeoffset, "compatible", 548 idx, &len); 549 if (!compat) 550 return TEE_ERROR_GENERIC; 551 552 res = probe_device_by_compat(fdt, nodeoffset, compat, type); 553 554 if (res != TEE_ERROR_ITEM_NOT_FOUND) 555 return res; 556 } 557 558 return TEE_ERROR_ITEM_NOT_FOUND; 559 } 560 561 static TEE_Result process_probe_list(const void *fdt) 562 { 563 struct dt_driver_probe *elt = NULL; 564 struct dt_driver_probe *prev = NULL; 565 static unsigned int __maybe_unused loop_count; 566 static unsigned int __maybe_unused deferral_loop_count; 567 bool __maybe_unused one_deferred = false; 568 bool one_probed_ok = false; 569 570 do { 571 loop_count++; 572 FMSG("Probe loop %u after %u for deferral(s)", loop_count, 573 deferral_loop_count); 574 575 /* Hack here for TRACE_DEBUG messages on probe list elements */ 576 if (TRACE_LEVEL >= TRACE_FLOW) 577 print_probe_list(fdt); 578 579 if (TAILQ_EMPTY(&dt_driver_probe_list)) 580 return TEE_SUCCESS; 581 582 /* 583 * Probe from current end to top. Deferred probed node are 584 * pushed back after current tail for the next probe round. 585 * Reset probe result flags and see status after probe round. 586 */ 587 one_deferred = false; 588 one_probed_ok = false; 589 added_node = false; 590 591 TAILQ_FOREACH_REVERSE_SAFE(elt, &dt_driver_probe_list, 592 dt_driver_probe_head, link, prev) { 593 TAILQ_REMOVE(&dt_driver_probe_list, elt, link); 594 595 switch (probe_driver_node(fdt, elt)) { 596 case TEE_SUCCESS: 597 one_probed_ok = true; 598 break; 599 case TEE_ERROR_DEFER_DRIVER_INIT: 600 one_deferred = true; 601 break; 602 default: 603 break; 604 } 605 } 606 607 if (one_deferred) 608 deferral_loop_count++; 609 610 } while (added_node || one_probed_ok); 611 612 DMSG("Unresolved dependencies after %u rounds, %u deferred", 613 loop_count, deferral_loop_count); 614 615 if (one_deferred) 616 return TEE_ERROR_DEFER_DRIVER_INIT; 617 else 618 return TEE_ERROR_GENERIC; 619 } 620 621 static int driver_probe_compare(struct dt_driver_probe *candidate, 622 struct dt_driver_probe *elt) 623 { 624 if (candidate->nodeoffset != elt->nodeoffset || 625 candidate->type != elt->type) 626 return 1; 627 628 assert(elt->dt_drv == candidate->dt_drv); 629 return 0; 630 } 631 632 /* 633 * Return TEE_SUCCESS if compatible found 634 * TEE_ERROR_OUT_OF_MEMORY if heap is exhausted 635 */ 636 static TEE_Result add_node_to_probe(const void *fdt, int node, 637 const struct dt_driver *dt_drv, 638 const struct dt_device_match *dm) 639 { 640 const char __maybe_unused *node_name = fdt_get_name(fdt, node, NULL); 641 const char __maybe_unused *drv_name = dt_drv->name; 642 struct dt_driver_probe *elt = NULL; 643 struct dt_driver_probe elt_new = { 644 .dm = dm, 645 .dt_drv = dt_drv, 646 .nodeoffset = node, 647 .type = dt_drv->type, 648 }; 649 650 /* If node/type found in probe list or ready list, nothing to do */ 651 TAILQ_FOREACH(elt, &dt_driver_probe_list, link) 652 if (!driver_probe_compare(&elt_new, elt)) 653 return TEE_SUCCESS; 654 655 TAILQ_FOREACH(elt, &dt_driver_ready_list, link) 656 if (!driver_probe_compare(&elt_new, elt)) 657 return TEE_SUCCESS; 658 659 elt = malloc(sizeof(*elt)); 660 if (!elt) 661 return TEE_ERROR_OUT_OF_MEMORY; 662 663 DMSG("element: %s on node %s", node_name, drv_name); 664 665 memcpy(elt, &elt_new, sizeof(*elt)); 666 667 added_node = true; 668 669 TAILQ_INSERT_TAIL(&dt_driver_probe_list, elt, link); 670 671 /* Hack here for TRACE_DEBUG messages on current probe list elements */ 672 if (TRACE_LEVEL >= TRACE_FLOW) 673 print_probe_list(fdt); 674 675 return TEE_SUCCESS; 676 } 677 678 /* 679 * Add a node to the probe list if a dt_driver matches target compatible. 680 * 681 * If @type is DT_DRIVER_ANY, probe list can hold only 1 driver to probe for 682 * the node. A node may probe several drivers if have a unique driver type. 683 * 684 * Return TEE_SUCCESS if compatible found 685 * TEE_ERROR_ITEM_NOT_FOUND if no matching driver 686 * TEE_ERROR_OUT_OF_MEMORY if heap is exhausted 687 */ 688 static TEE_Result add_probe_node_by_compat(const void *fdt, int node, 689 const char *compat) 690 { 691 TEE_Result res = TEE_ERROR_ITEM_NOT_FOUND; 692 const struct dt_driver *dt_drv = NULL; 693 const struct dt_device_match *dm = NULL; 694 uint32_t found_types = 0; 695 696 for_each_dt_driver(dt_drv) { 697 for (dm = dt_drv->match_table; dm && dm->compatible; dm++) { 698 if (strcmp(dm->compatible, compat) == 0) { 699 assert(dt_drv->type < 32); 700 701 res = add_node_to_probe(fdt, node, dt_drv, dm); 702 if (res) 703 return res; 704 705 if (found_types & BIT(dt_drv->type)) { 706 EMSG("Driver %s multi hit on type %u", 707 dt_drv->name, dt_drv->type); 708 panic(); 709 } 710 found_types |= BIT(dt_drv->type); 711 712 /* Matching found for this driver, try next */ 713 break; 714 } 715 } 716 } 717 718 return res; 719 } 720 721 /* 722 * Add the node to the probe list if matching compatible drivers are found. 723 * Follow node's compatible property list ordering to find matching driver. 724 */ 725 TEE_Result dt_driver_maybe_add_probe_node(const void *fdt, int node) 726 { 727 int idx = 0; 728 int len = 0; 729 int count = 0; 730 const char *compat = NULL; 731 TEE_Result res = TEE_ERROR_GENERIC; 732 733 if (fdt_get_status(fdt, node) == DT_STATUS_DISABLED) 734 return TEE_SUCCESS; 735 736 count = fdt_stringlist_count(fdt, node, "compatible"); 737 if (count < 0) 738 return TEE_SUCCESS; 739 740 for (idx = 0; idx < count; idx++) { 741 compat = fdt_stringlist_get(fdt, node, "compatible", idx, &len); 742 assert(compat && len > 0); 743 744 res = add_probe_node_by_compat(fdt, node, compat); 745 746 /* Stop lookup if something was found */ 747 if (res != TEE_ERROR_ITEM_NOT_FOUND) 748 return res; 749 } 750 751 return TEE_SUCCESS; 752 } 753 754 static void parse_node(const void *fdt, int node) 755 { 756 TEE_Result __maybe_unused res = TEE_ERROR_GENERIC; 757 int subnode = 0; 758 759 fdt_for_each_subnode(subnode, fdt, node) { 760 res = dt_driver_maybe_add_probe_node(fdt, subnode); 761 if (res) { 762 EMSG("Failed on node %s with %#"PRIx32, 763 fdt_get_name(fdt, subnode, NULL), res); 764 panic(); 765 } 766 767 /* 768 * Rescursively parse the FDT, skipping disabled nodes. 769 * FDT is expected reliable and core shall have sufficient 770 * stack depth to possibly parse all DT nodes. 771 */ 772 if (IS_ENABLED(CFG_DRIVERS_DT_RECURSIVE_PROBE)) { 773 if (fdt_get_status(fdt, subnode) == DT_STATUS_DISABLED) 774 continue; 775 776 parse_node(fdt, subnode); 777 } 778 } 779 } 780 781 /* 782 * Parse FDT for nodes and save in probe list the node for which a dt_driver 783 * matches node's compatible property. 784 */ 785 static TEE_Result probe_dt_drivers_early(void) 786 { 787 TEE_Result res = TEE_ERROR_GENERIC; 788 const void *fdt = NULL; 789 790 fdt = get_secure_dt(); 791 if (!fdt) 792 return TEE_SUCCESS; 793 794 parse_node(fdt, fdt_path_offset(fdt, "/")); 795 796 res = process_probe_list(fdt); 797 if (res == TEE_ERROR_DEFER_DRIVER_INIT) { 798 DMSG("Deferred drivers probing"); 799 print_probe_list(fdt); 800 res = TEE_SUCCESS; 801 } 802 803 return res; 804 } 805 806 static TEE_Result probe_dt_drivers(void) 807 { 808 TEE_Result res = TEE_ERROR_GENERIC; 809 const void *fdt = NULL; 810 811 fdt = get_secure_dt(); 812 if (!fdt) 813 return TEE_SUCCESS; 814 815 res = process_probe_list(fdt); 816 if (res || !TAILQ_EMPTY(&dt_driver_failed_list)) { 817 EMSG("Probe sequence result: %#"PRIx32, res); 818 print_probe_list(fdt); 819 panic(); 820 } 821 822 return TEE_SUCCESS; 823 } 824 825 early_init_late(probe_dt_drivers_early); 826 driver_init(probe_dt_drivers); 827 828 static TEE_Result release_probe_lists(void) 829 { 830 struct dt_driver_probe *elt = NULL; 831 struct dt_driver_probe *next = NULL; 832 struct dt_driver_provider *prov = NULL; 833 struct dt_driver_provider *next_prov = NULL; 834 const void *fdt = NULL; 835 836 fdt = get_secure_dt(); 837 if (!fdt) 838 return TEE_SUCCESS; 839 840 assert(fdt && TAILQ_EMPTY(&dt_driver_probe_list)); 841 842 TAILQ_FOREACH_SAFE(elt, &dt_driver_ready_list, link, next) 843 free(elt); 844 845 TAILQ_FOREACH_SAFE(elt, &dt_driver_failed_list, link, next) 846 free(elt); 847 848 SLIST_FOREACH_SAFE(prov, &dt_driver_provider_list, link, next_prov) 849 free(prov); 850 851 return TEE_SUCCESS; 852 } 853 854 release_init_resource(release_probe_lists); 855 856 /* 857 * Simple bus support: handy to parse subnodes 858 */ 859 static TEE_Result simple_bus_probe(const void *fdt, int node, 860 const void *compat_data __unused) 861 { 862 TEE_Result res = TEE_ERROR_GENERIC; 863 int subnode = 0; 864 865 fdt_for_each_subnode(subnode, fdt, node) { 866 res = dt_driver_maybe_add_probe_node(fdt, subnode); 867 if (res) { 868 EMSG("Failed on node %s with %#"PRIx32, 869 fdt_get_name(fdt, subnode, NULL), res); 870 panic(); 871 } 872 } 873 874 return TEE_SUCCESS; 875 } 876 877 static const struct dt_device_match simple_bus_match_table[] = { 878 { .compatible = "simple-bus" }, 879 { } 880 }; 881 882 DEFINE_DT_DRIVER(simple_bus_dt_driver) = { 883 .name = "simple-bus", 884 .match_table = simple_bus_match_table, 885 .probe = simple_bus_probe, 886 }; 887