drivers/tee/optee/core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2018 Linaro Limited
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <log.h>
   9 #include <malloc.h>
  10 #include <tee.h>
  11 #include <linux/arm-smccc.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14
  15 #include "optee_smc.h"
  16 #include "optee_msg.h"
  17 #include "optee_private.h"
  18
  19 #define PAGELIST_ENTRIES_PER_PAGE \
  20         ((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
  21
  22 typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
  23                                unsigned long, unsigned long, unsigned long,
  24                                unsigned long, unsigned long,
  25                                struct arm_smccc_res *);
  26
  27 struct optee_pdata {
  28         optee_invoke_fn *invoke_fn;
  29 };
  30
  31 struct rpc_param {
  32         u32     a0;
  33         u32     a1;
  34         u32     a2;
  35         u32     a3;
  36         u32     a4;
  37         u32     a5;
  38         u32     a6;
  39         u32     a7;
  40 };
  41
  42 /**
  43  * reg_pair_to_ptr() - Make a pointer of 2 32-bit values
  44  * @reg0:       High bits of the pointer
  45  * @reg1:       Low bits of the pointer
  46  *
  47  * Returns the combined result, note that if a pointer is 32-bit wide @reg0
  48  * will be discarded.
  49  */
  50 static void *reg_pair_to_ptr(u32 reg0, u32 reg1)
  51 {
  52         return (void *)(ulong)(((u64)reg0 << 32) | reg1);
  53 }
  54
  55 /**
  56  * reg_pair_from_64() - Split a 64-bit value into two 32-bit values
  57  * @reg0:       High bits of @val
  58  * @reg1:       Low bits of @val
  59  * @val:        The value to split
  60  */
  61 static void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
  62 {
  63         *reg0 = val >> 32;
  64         *reg1 = val;
  65 }
  66
  67 /**
  68  * optee_alloc_and_init_page_list() - Provide page list of memory buffer
  69  * @buf:                Start of buffer
  70  * @len:                Length of buffer
  71  * @phys_buf_ptr        Physical pointer with coded offset to page list
  72  *
  73  * Secure world doesn't share mapping with Normal world (U-Boot in this case)
  74  * so physical pointers are needed when sharing pointers.
  75  *
  76  * Returns a pointer page list on success or NULL on failure
  77  */
  78 void *optee_alloc_and_init_page_list(void *buf, ulong len, u64 *phys_buf_ptr)
  79 {
  80         const unsigned int page_size = OPTEE_MSG_NONCONTIG_PAGE_SIZE;
  81         const phys_addr_t page_mask = page_size - 1;
  82         u8 *buf_base;
  83         unsigned int page_offset;
  84         unsigned int num_pages;
  85         unsigned int list_size;
  86         unsigned int n;
  87         void *page_list;
  88         struct {
  89                 u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
  90                 u64 next_page_data;
  91         } *pages_data;
  92
  93         /*
  94          * A Memory buffer is described in chunks of 4k. The list of
  95          * physical addresses has to be represented by a physical pointer
  96          * too and a single list has to start at a 4k page and fit into
  97          * that page. In order to be able to describe large memory buffers
  98          * these 4k pages carrying physical addresses are linked together
  99          * in a list. See OPTEE_MSG_ATTR_NONCONTIG in
 100          * drivers/tee/optee/optee_msg.h for more information.
 101          */
 102
 103         page_offset = (ulong)buf & page_mask;
 104         num_pages = roundup(page_offset + len, page_size) / page_size;
 105         list_size = DIV_ROUND_UP(num_pages, PAGELIST_ENTRIES_PER_PAGE) *
 106                     page_size;
 107         page_list = memalign(page_size, list_size);
 108         if (!page_list)
 109                 return NULL;
 110
 111         pages_data = page_list;
 112         buf_base = (u8 *)rounddown((ulong)buf, page_size);
 113         n = 0;
 114         while (num_pages) {
 115                 pages_data->pages_list[n] = virt_to_phys(buf_base);
 116                 n++;
 117                 buf_base += page_size;
 118                 num_pages--;
 119
 120                 if (n == PAGELIST_ENTRIES_PER_PAGE) {
 121                         pages_data->next_page_data =
 122                                 virt_to_phys(pages_data + 1);
 123                         pages_data++;
 124                         n = 0;
 125                 }
 126         }
 127
 128         *phys_buf_ptr = virt_to_phys(page_list) | page_offset;
 129         return page_list;
 130 }
 131
 132 static void optee_get_version(struct udevice *dev,
 133                               struct tee_version_data *vers)
 134 {
 135         struct tee_version_data v = {
 136                 .gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM,
 137         };
 138
 139         *vers = v;
 140 }
 141
 142 static int get_msg_arg(struct udevice *dev, uint num_params,
 143                        struct tee_shm **shmp, struct optee_msg_arg **msg_arg)
 144 {
 145         int rc;
 146         struct optee_msg_arg *ma;
 147
 148         rc = __tee_shm_add(dev, OPTEE_MSG_NONCONTIG_PAGE_SIZE, NULL,
 149                            OPTEE_MSG_GET_ARG_SIZE(num_params), TEE_SHM_ALLOC,
 150                            shmp);
 151         if (rc)
 152                 return rc;
 153
 154         ma = (*shmp)->addr;
 155         memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
 156         ma->num_params = num_params;
 157         *msg_arg = ma;
 158
 159         return 0;
 160 }
 161
 162 static int to_msg_param(struct optee_msg_param *msg_params, uint num_params,
 163                         const struct tee_param *params)
 164 {
 165         uint n;
 166
 167         for (n = 0; n < num_params; n++) {
 168                 const struct tee_param *p = params + n;
 169                 struct optee_msg_param *mp = msg_params + n;
 170
 171                 switch (p->attr) {
 172                 case TEE_PARAM_ATTR_TYPE_NONE:
 173                         mp->attr = OPTEE_MSG_ATTR_TYPE_NONE;
 174                         memset(&mp->u, 0, sizeof(mp->u));
 175                         break;
 176                 case TEE_PARAM_ATTR_TYPE_VALUE_INPUT:
 177                 case TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT:
 178                 case TEE_PARAM_ATTR_TYPE_VALUE_INOUT:
 179                         mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
 180                                    TEE_PARAM_ATTR_TYPE_VALUE_INPUT;
 181                         mp->u.value.a = p->u.value.a;
 182                         mp->u.value.b = p->u.value.b;
 183                         mp->u.value.c = p->u.value.c;
 184                         break;
 185                 case TEE_PARAM_ATTR_TYPE_MEMREF_INPUT:
 186                 case TEE_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
 187                 case TEE_PARAM_ATTR_TYPE_MEMREF_INOUT:
 188                         mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
 189                                    TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
 190                         mp->u.rmem.shm_ref = (ulong)p->u.memref.shm;
 191                         mp->u.rmem.size = p->u.memref.size;
 192                         mp->u.rmem.offs = p->u.memref.shm_offs;
 193                         break;
 194                 default:
 195                         return -EINVAL;
 196                 }
 197         }
 198         return 0;
 199 }
 200
 201 static int from_msg_param(struct tee_param *params, uint num_params,
 202                           const struct optee_msg_param *msg_params)
 203 {
 204         uint n;
 205         struct tee_shm *shm;
 206
 207         for (n = 0; n < num_params; n++) {
 208                 struct tee_param *p = params + n;
 209                 const struct optee_msg_param *mp = msg_params + n;
 210                 u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
 211
 212                 switch (attr) {
 213                 case OPTEE_MSG_ATTR_TYPE_NONE:
 214                         p->attr = TEE_PARAM_ATTR_TYPE_NONE;
 215                         memset(&p->u, 0, sizeof(p->u));
 216                         break;
 217                 case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
 218                 case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
 219                 case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
 220                         p->attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT + attr -
 221                                   OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
 222                         p->u.value.a = mp->u.value.a;
 223                         p->u.value.b = mp->u.value.b;
 224                         p->u.value.c = mp->u.value.c;
 225                         break;
 226                 case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
 227                 case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
 228                 case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
 229                         p->attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT + attr -
 230                                   OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
 231                         p->u.memref.size = mp->u.rmem.size;
 232                         shm = (struct tee_shm *)(ulong)mp->u.rmem.shm_ref;
 233
 234                         if (!shm) {
 235                                 p->u.memref.shm_offs = 0;
 236                                 p->u.memref.shm = NULL;
 237                                 break;
 238                         }
 239                         p->u.memref.shm_offs = mp->u.rmem.offs;
 240                         p->u.memref.shm = shm;
 241                         break;
 242                 default:
 243                         return -EINVAL;
 244                 }
 245         }
 246         return 0;
 247 }
 248
 249 static void handle_rpc(struct udevice *dev, struct rpc_param *param,
 250                        void *page_list)
 251 {
 252         struct tee_shm *shm;
 253
 254         switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
 255         case OPTEE_SMC_RPC_FUNC_ALLOC:
 256                 if (!__tee_shm_add(dev, OPTEE_MSG_NONCONTIG_PAGE_SIZE, NULL,
 257                                    param->a1, TEE_SHM_ALLOC | TEE_SHM_REGISTER,
 258                                    &shm)) {
 259                         reg_pair_from_64(&param->a1, &param->a2,
 260                                          virt_to_phys(shm->addr));
 261                         /* "cookie" */
 262                         reg_pair_from_64(&param->a4, &param->a5, (ulong)shm);
 263                 } else {
 264                         param->a1 = 0;
 265                         param->a2 = 0;
 266                         param->a4 = 0;
 267                         param->a5 = 0;
 268                 }
 269                 break;
 270         case OPTEE_SMC_RPC_FUNC_FREE:
 271                 shm = reg_pair_to_ptr(param->a1, param->a2);
 272                 tee_shm_free(shm);
 273                 break;
 274         case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
 275                 break;
 276         case OPTEE_SMC_RPC_FUNC_CMD:
 277                 shm = reg_pair_to_ptr(param->a1, param->a2);
 278                 optee_suppl_cmd(dev, shm, page_list);
 279                 break;
 280         default:
 281                 break;
 282         }
 283
 284         param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
 285 }
 286
 287 static u32 call_err_to_res(u32 call_err)
 288 {
 289         switch (call_err) {
 290         case OPTEE_SMC_RETURN_OK:
 291                 return TEE_SUCCESS;
 292         default:
 293                 return TEE_ERROR_BAD_PARAMETERS;
 294         }
 295 }
 296
 297 static u32 do_call_with_arg(struct udevice *dev, struct optee_msg_arg *arg)
 298 {
 299         struct optee_pdata *pdata = dev_get_platdata(dev);
 300         struct rpc_param param = { .a0 = OPTEE_SMC_CALL_WITH_ARG };
 301         void *page_list = NULL;
 302
 303         reg_pair_from_64(&param.a1, &param.a2, virt_to_phys(arg));
 304         while (true) {
 305                 struct arm_smccc_res res;
 306
 307                 pdata->invoke_fn(param.a0, param.a1, param.a2, param.a3,
 308                                  param.a4, param.a5, param.a6, param.a7, &res);
 309
 310                 free(page_list);
 311                 page_list = NULL;
 312
 313                 if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
 314                         param.a0 = res.a0;
 315                         param.a1 = res.a1;
 316                         param.a2 = res.a2;
 317                         param.a3 = res.a3;
 318                         handle_rpc(dev, &param, &page_list);
 319                 } else {
 320                         /*
 321                          * In case we've accessed RPMB to serve an RPC
 322                          * request we need to restore the previously
 323                          * selected partition as the caller may expect it
 324                          * to remain unchanged.
 325                          */
 326                         optee_suppl_rpmb_release(dev);
 327                         return call_err_to_res(res.a0);
 328                 }
 329         }
 330 }
 331
 332 static int optee_close_session(struct udevice *dev, u32 session)
 333 {
 334         int rc;
 335         struct tee_shm *shm;
 336         struct optee_msg_arg *msg_arg;
 337
 338         rc = get_msg_arg(dev, 0, &shm, &msg_arg);
 339         if (rc)
 340                 return rc;
 341
 342         msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
 343         msg_arg->session = session;
 344         do_call_with_arg(dev, msg_arg);
 345
 346         tee_shm_free(shm);
 347
 348         return 0;
 349 }
 350
 351 static int optee_open_session(struct udevice *dev,
 352                               struct tee_open_session_arg *arg,
 353                               uint num_params, struct tee_param *params)
 354 {
 355         int rc;
 356         struct tee_shm *shm;
 357         struct optee_msg_arg *msg_arg;
 358
 359         rc = get_msg_arg(dev, num_params + 2, &shm, &msg_arg);
 360         if (rc)
 361                 return rc;
 362
 363         msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
 364         /*
 365          * Initialize and add the meta parameters needed when opening a
 366          * session.
 367          */
 368         msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
 369                                   OPTEE_MSG_ATTR_META;
 370         msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
 371                                   OPTEE_MSG_ATTR_META;
 372         memcpy(&msg_arg->params[0].u.value, arg->uuid, sizeof(arg->uuid));
 373         memcpy(&msg_arg->params[1].u.value, arg->uuid, sizeof(arg->clnt_uuid));
 374         msg_arg->params[1].u.value.c = arg->clnt_login;
 375
 376         rc = to_msg_param(msg_arg->params + 2, num_params, params);
 377         if (rc)
 378                 goto out;
 379
 380         arg->ret = do_call_with_arg(dev, msg_arg);
 381         if (arg->ret) {
 382                 arg->ret_origin = TEE_ORIGIN_COMMS;
 383                 goto out;
 384         }
 385
 386         if (from_msg_param(params, num_params, msg_arg->params + 2)) {
 387                 arg->ret = TEE_ERROR_COMMUNICATION;
 388                 arg->ret_origin = TEE_ORIGIN_COMMS;
 389                 /* Close session again to avoid leakage */
 390                 optee_close_session(dev, msg_arg->session);
 391                 goto out;
 392         }
 393
 394         arg->session = msg_arg->session;
 395         arg->ret = msg_arg->ret;
 396         arg->ret_origin = msg_arg->ret_origin;
 397 out:
 398         tee_shm_free(shm);
 399
 400         return rc;
 401 }
 402
 403 static int optee_invoke_func(struct udevice *dev, struct tee_invoke_arg *arg,
 404                              uint num_params, struct tee_param *params)
 405 {
 406         struct tee_shm *shm;
 407         struct optee_msg_arg *msg_arg;
 408         int rc;
 409
 410         rc = get_msg_arg(dev, num_params, &shm, &msg_arg);
 411         if (rc)
 412                 return rc;
 413         msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
 414         msg_arg->func = arg->func;
 415         msg_arg->session = arg->session;
 416
 417         rc = to_msg_param(msg_arg->params, num_params, params);
 418         if (rc)
 419                 goto out;
 420
 421         arg->ret = do_call_with_arg(dev, msg_arg);
 422         if (arg->ret) {
 423                 arg->ret_origin = TEE_ORIGIN_COMMS;
 424                 goto out;
 425         }
 426
 427         if (from_msg_param(params, num_params, msg_arg->params)) {
 428                 arg->ret = TEE_ERROR_COMMUNICATION;
 429                 arg->ret_origin = TEE_ORIGIN_COMMS;
 430                 goto out;
 431         }
 432
 433         arg->ret = msg_arg->ret;
 434         arg->ret_origin = msg_arg->ret_origin;
 435 out:
 436         tee_shm_free(shm);
 437         return rc;
 438 }
 439
 440 static int optee_shm_register(struct udevice *dev, struct tee_shm *shm)
 441 {
 442         struct tee_shm *shm_arg;
 443         struct optee_msg_arg *msg_arg;
 444         void *pl;
 445         u64 ph_ptr;
 446         int rc;
 447
 448         rc = get_msg_arg(dev, 1, &shm_arg, &msg_arg);
 449         if (rc)
 450                 return rc;
 451
 452         pl = optee_alloc_and_init_page_list(shm->addr, shm->size, &ph_ptr);
 453         if (!pl) {
 454                 rc = -ENOMEM;
 455                 goto out;
 456         }
 457
 458         msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
 459         msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
 460                                 OPTEE_MSG_ATTR_NONCONTIG;
 461         msg_arg->params->u.tmem.buf_ptr = ph_ptr;
 462         msg_arg->params->u.tmem.shm_ref = (ulong)shm;
 463         msg_arg->params->u.tmem.size = shm->size;
 464
 465         if (do_call_with_arg(dev, msg_arg) || msg_arg->ret)
 466                 rc = -EINVAL;
 467
 468         free(pl);
 469 out:
 470         tee_shm_free(shm_arg);
 471
 472         return rc;
 473 }
 474
 475 static int optee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
 476 {
 477         struct tee_shm *shm_arg;
 478         struct optee_msg_arg *msg_arg;
 479         int rc;
 480
 481         rc = get_msg_arg(dev, 1, &shm_arg, &msg_arg);
 482         if (rc)
 483                 return rc;
 484
 485         msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
 486         msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
 487         msg_arg->params[0].u.rmem.shm_ref = (ulong)shm;
 488
 489         if (do_call_with_arg(dev, msg_arg) || msg_arg->ret)
 490                 rc = -EINVAL;
 491         tee_shm_free(shm_arg);
 492
 493         return rc;
 494 }
 495
 496 static const struct tee_driver_ops optee_ops = {
 497         .get_version = optee_get_version,
 498         .open_session = optee_open_session,
 499         .close_session = optee_close_session,
 500         .invoke_func = optee_invoke_func,
 501         .shm_register = optee_shm_register,
 502         .shm_unregister = optee_shm_unregister,
 503 };
 504
 505 static bool is_optee_api(optee_invoke_fn *invoke_fn)
 506 {
 507         struct arm_smccc_res res;
 508
 509         invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
 510
 511         return res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
 512                res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3;
 513 }
 514
 515 static void print_os_revision(struct udevice *dev, optee_invoke_fn *invoke_fn)
 516 {
 517         union {
 518                 struct arm_smccc_res smccc;
 519                 struct optee_smc_call_get_os_revision_result result;
 520         } res = {
 521                 .result = {
 522                 .build_id = 0
 523                 }
 524         };
 525
 526         invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
 527                   &res.smccc);
 528
 529         if (res.result.build_id)
 530                 dev_info(dev, "OP-TEE: revision %lu.%lu (%08lx)\n",
 531                          res.result.major, res.result.minor,
 532                          res.result.build_id);
 533         else
 534                 dev_info(dev, "OP-TEE: revision %lu.%lu\n",
 535                          res.result.major, res.result.minor);
 536 }
 537
 538 static bool api_revision_is_compatible(optee_invoke_fn *invoke_fn)
 539 {
 540         union {
 541                 struct arm_smccc_res smccc;
 542                 struct optee_smc_calls_revision_result result;
 543         } res;
 544
 545         invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 546
 547         return res.result.major == OPTEE_MSG_REVISION_MAJOR &&
 548                (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR;
 549 }
 550
 551 static bool exchange_capabilities(optee_invoke_fn *invoke_fn, u32 *sec_caps)
 552 {
 553         union {
 554                 struct arm_smccc_res smccc;
 555                 struct optee_smc_exchange_capabilities_result result;
 556         } res;
 557
 558         invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES,
 559                   OPTEE_SMC_NSEC_CAP_UNIPROCESSOR, 0, 0, 0, 0, 0, 0,
 560                   &res.smccc);
 561
 562         if (res.result.status != OPTEE_SMC_RETURN_OK)
 563                 return false;
 564
 565         *sec_caps = res.result.capabilities;
 566
 567         return true;
 568 }
 569
 570 /* Simple wrapper functions to be able to use a function pointer */
 571 static void optee_smccc_smc(unsigned long a0, unsigned long a1,
 572                             unsigned long a2, unsigned long a3,
 573                             unsigned long a4, unsigned long a5,
 574                             unsigned long a6, unsigned long a7,
 575                             struct arm_smccc_res *res)
 576 {
 577         arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 578 }
 579
 580 static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
 581                             unsigned long a2, unsigned long a3,
 582                             unsigned long a4, unsigned long a5,
 583                             unsigned long a6, unsigned long a7,
 584                             struct arm_smccc_res *res)
 585 {
 586         arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 587 }
 588
 589 static optee_invoke_fn *get_invoke_func(struct udevice *dev)
 590 {
 591         const char *method;
 592
 593         debug("optee: looking for conduit method in DT.\n");
 594         method = ofnode_get_property(dev->node, "method", NULL);
 595         if (!method) {
 596                 debug("optee: missing \"method\" property\n");
 597                 return ERR_PTR(-ENXIO);
 598         }
 599
 600         if (!strcmp("hvc", method))
 601                 return optee_smccc_hvc;
 602         else if (!strcmp("smc", method))
 603                 return optee_smccc_smc;
 604
 605         debug("optee: invalid \"method\" property: %s\n", method);
 606         return ERR_PTR(-EINVAL);
 607 }
 608
 609 static int optee_ofdata_to_platdata(struct udevice *dev)
 610 {
 611         struct optee_pdata *pdata = dev_get_platdata(dev);
 612
 613         pdata->invoke_fn = get_invoke_func(dev);
 614         if (IS_ERR(pdata->invoke_fn))
 615                 return PTR_ERR(pdata->invoke_fn);
 616
 617         return 0;
 618 }
 619
 620 static int optee_probe(struct udevice *dev)
 621 {
 622         struct optee_pdata *pdata = dev_get_platdata(dev);
 623         u32 sec_caps;
 624
 625         if (!is_optee_api(pdata->invoke_fn)) {
 626                 debug("%s: OP-TEE api uid mismatch\n", __func__);
 627                 return -ENOENT;
 628         }
 629
 630         print_os_revision(dev, pdata->invoke_fn);
 631
 632         if (!api_revision_is_compatible(pdata->invoke_fn)) {
 633                 debug("%s: OP-TEE api revision mismatch\n", __func__);
 634                 return -ENOENT;
 635         }
 636
 637         /*
 638          * OP-TEE can use both shared memory via predefined pool or as
 639          * dynamic shared memory provided by normal world. To keep things
 640          * simple we're only using dynamic shared memory in this driver.
 641          */
 642         if (!exchange_capabilities(pdata->invoke_fn, &sec_caps) ||
 643             !(sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)) {
 644                 debug("%s: OP-TEE capabilities mismatch\n", __func__);
 645                 return -ENOENT;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static const struct udevice_id optee_match[] = {
 652         { .compatible = "linaro,optee-tz" },
 653         {},
 654 };
 655
 656 U_BOOT_DRIVER(optee) = {
 657         .name = "optee",
 658         .id = UCLASS_TEE,
 659         .of_match = optee_match,
 660         .ofdata_to_platdata = optee_ofdata_to_platdata,
 661         .probe = optee_probe,
 662         .ops = &optee_ops,
 663         .platdata_auto_alloc_size = sizeof(struct optee_pdata),
 664         .priv_auto_alloc_size = sizeof(struct optee_private),
 665 };