1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014 Intel Corporation 4 * 5 * Authors: 6 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> 7 * 8 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 9 * 10 * This device driver implements the TPM interface as defined in 11 * the TCG CRB 2.0 TPM specification. 12 */ 13 14 #include <linux/acpi.h> 15 #include <linux/highmem.h> 16 #include <linux/rculist.h> 17 #include <linux/module.h> 18 #include <linux/pm_runtime.h> 19 #ifdef CONFIG_ARM64 20 #include <linux/arm-smccc.h> 21 #endif 22 #include "tpm.h" 23 24 #define ACPI_SIG_TPM2 "TPM2" 25 #define TPM_CRB_MAX_RESOURCES 3 26 27 static const guid_t crb_acpi_start_guid = 28 GUID_INIT(0x6BBF6CAB, 0x5463, 0x4714, 29 0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4); 30 31 enum crb_defaults { 32 CRB_ACPI_START_REVISION_ID = 1, 33 CRB_ACPI_START_INDEX = 1, 34 }; 35 36 enum crb_loc_ctrl { 37 CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0), 38 CRB_LOC_CTRL_RELINQUISH = BIT(1), 39 }; 40 41 enum crb_loc_state { 42 CRB_LOC_STATE_LOC_ASSIGNED = BIT(1), 43 CRB_LOC_STATE_TPM_REG_VALID_STS = BIT(7), 44 }; 45 46 enum crb_ctrl_req { 47 CRB_CTRL_REQ_CMD_READY = BIT(0), 48 CRB_CTRL_REQ_GO_IDLE = BIT(1), 49 }; 50 51 enum crb_ctrl_sts { 52 CRB_CTRL_STS_ERROR = BIT(0), 53 CRB_CTRL_STS_TPM_IDLE = BIT(1), 54 }; 55 56 enum crb_start { 57 CRB_START_INVOKE = BIT(0), 58 }; 59 60 enum crb_cancel { 61 CRB_CANCEL_INVOKE = BIT(0), 62 }; 63 64 struct crb_regs_head { 65 u32 loc_state; 66 u32 reserved1; 67 u32 loc_ctrl; 68 u32 loc_sts; 69 u8 reserved2[32]; 70 u64 intf_id; 71 u64 ctrl_ext; 72 } __packed; 73 74 struct crb_regs_tail { 75 u32 ctrl_req; 76 u32 ctrl_sts; 77 u32 ctrl_cancel; 78 u32 ctrl_start; 79 u32 ctrl_int_enable; 80 u32 ctrl_int_sts; 81 u32 ctrl_cmd_size; 82 u32 ctrl_cmd_pa_low; 83 u32 ctrl_cmd_pa_high; 84 u32 ctrl_rsp_size; 85 u64 ctrl_rsp_pa; 86 } __packed; 87 88 enum crb_status { 89 CRB_DRV_STS_COMPLETE = BIT(0), 90 }; 91 92 struct crb_priv { 93 u32 sm; 94 const char *hid; 95 struct crb_regs_head __iomem *regs_h; 96 struct crb_regs_tail __iomem *regs_t; 97 u8 __iomem *cmd; 98 u8 __iomem *rsp; 99 u32 cmd_size; 100 u32 smc_func_id; 101 u32 __iomem *pluton_start_addr; 102 u32 __iomem *pluton_reply_addr; 103 }; 104 105 struct tpm2_crb_smc { 106 u32 interrupt; 107 u8 interrupt_flags; 108 u8 op_flags; 109 u16 reserved2; 110 u32 smc_func_id; 111 }; 112 113 struct tpm2_crb_pluton { 114 u64 start_addr; 115 u64 reply_addr; 116 }; 117 118 static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value, 119 unsigned long timeout) 120 { 121 ktime_t start; 122 ktime_t stop; 123 124 start = ktime_get(); 125 stop = ktime_add(start, ms_to_ktime(timeout)); 126 127 do { 128 if ((ioread32(reg) & mask) == value) 129 return true; 130 131 usleep_range(50, 100); 132 } while (ktime_before(ktime_get(), stop)); 133 134 return ((ioread32(reg) & mask) == value); 135 } 136 137 static int crb_try_pluton_doorbell(struct crb_priv *priv, bool wait_for_complete) 138 { 139 if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) 140 return 0; 141 142 if (!crb_wait_for_reg_32(priv->pluton_reply_addr, ~0, 1, TPM2_TIMEOUT_C)) 143 return -ETIME; 144 145 iowrite32(1, priv->pluton_start_addr); 146 if (wait_for_complete == false) 147 return 0; 148 149 if (!crb_wait_for_reg_32(priv->pluton_start_addr, 150 0xffffffff, 0, 200)) 151 return -ETIME; 152 153 return 0; 154 } 155 156 /** 157 * __crb_go_idle - request tpm crb device to go the idle state 158 * 159 * @dev: crb device 160 * @priv: crb private data 161 * 162 * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ 163 * The device should respond within TIMEOUT_C by clearing the bit. 164 * Anyhow, we do not wait here as a consequent CMD_READY request 165 * will be handled correctly even if idle was not completed. 166 * 167 * The function does nothing for devices with ACPI-start method 168 * or SMC-start method. 169 * 170 * Return: 0 always 171 */ 172 static int __crb_go_idle(struct device *dev, struct crb_priv *priv) 173 { 174 int rc; 175 176 if ((priv->sm == ACPI_TPM2_START_METHOD) || 177 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || 178 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC)) 179 return 0; 180 181 iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req); 182 183 rc = crb_try_pluton_doorbell(priv, true); 184 if (rc) 185 return rc; 186 187 if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req, 188 CRB_CTRL_REQ_GO_IDLE/* mask */, 189 0, /* value */ 190 TPM2_TIMEOUT_C)) { 191 dev_warn(dev, "goIdle timed out\n"); 192 return -ETIME; 193 } 194 195 return 0; 196 } 197 198 static int crb_go_idle(struct tpm_chip *chip) 199 { 200 struct device *dev = &chip->dev; 201 struct crb_priv *priv = dev_get_drvdata(dev); 202 203 return __crb_go_idle(dev, priv); 204 } 205 206 /** 207 * __crb_cmd_ready - request tpm crb device to enter ready state 208 * 209 * @dev: crb device 210 * @priv: crb private data 211 * 212 * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ 213 * and poll till the device acknowledge it by clearing the bit. 214 * The device should respond within TIMEOUT_C. 215 * 216 * The function does nothing for devices with ACPI-start method 217 * or SMC-start method. 218 * 219 * Return: 0 on success -ETIME on timeout; 220 */ 221 static int __crb_cmd_ready(struct device *dev, struct crb_priv *priv) 222 { 223 int rc; 224 225 if ((priv->sm == ACPI_TPM2_START_METHOD) || 226 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) || 227 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC)) 228 return 0; 229 230 iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req); 231 232 rc = crb_try_pluton_doorbell(priv, true); 233 if (rc) 234 return rc; 235 236 if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req, 237 CRB_CTRL_REQ_CMD_READY /* mask */, 238 0, /* value */ 239 TPM2_TIMEOUT_C)) { 240 dev_warn(dev, "cmdReady timed out\n"); 241 return -ETIME; 242 } 243 244 return 0; 245 } 246 247 static int crb_cmd_ready(struct tpm_chip *chip) 248 { 249 struct device *dev = &chip->dev; 250 struct crb_priv *priv = dev_get_drvdata(dev); 251 252 return __crb_cmd_ready(dev, priv); 253 } 254 255 static int __crb_request_locality(struct device *dev, 256 struct crb_priv *priv, int loc) 257 { 258 u32 value = CRB_LOC_STATE_LOC_ASSIGNED | 259 CRB_LOC_STATE_TPM_REG_VALID_STS; 260 261 if (!priv->regs_h) 262 return 0; 263 264 iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl); 265 if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value, 266 TPM2_TIMEOUT_C)) { 267 dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n"); 268 return -ETIME; 269 } 270 271 return 0; 272 } 273 274 static int crb_request_locality(struct tpm_chip *chip, int loc) 275 { 276 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 277 278 return __crb_request_locality(&chip->dev, priv, loc); 279 } 280 281 static int __crb_relinquish_locality(struct device *dev, 282 struct crb_priv *priv, int loc) 283 { 284 u32 mask = CRB_LOC_STATE_LOC_ASSIGNED | 285 CRB_LOC_STATE_TPM_REG_VALID_STS; 286 u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS; 287 288 if (!priv->regs_h) 289 return 0; 290 291 iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl); 292 if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value, 293 TPM2_TIMEOUT_C)) { 294 dev_warn(dev, "TPM_LOC_STATE_x.Relinquish timed out\n"); 295 return -ETIME; 296 } 297 298 return 0; 299 } 300 301 static int crb_relinquish_locality(struct tpm_chip *chip, int loc) 302 { 303 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 304 305 return __crb_relinquish_locality(&chip->dev, priv, loc); 306 } 307 308 static u8 crb_status(struct tpm_chip *chip) 309 { 310 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 311 u8 sts = 0; 312 313 if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) != 314 CRB_START_INVOKE) 315 sts |= CRB_DRV_STS_COMPLETE; 316 317 return sts; 318 } 319 320 static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count) 321 { 322 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 323 unsigned int expected; 324 325 /* A sanity check that the upper layer wants to get at least the header 326 * as that is the minimum size for any TPM response. 327 */ 328 if (count < TPM_HEADER_SIZE) 329 return -EIO; 330 331 /* If this bit is set, according to the spec, the TPM is in 332 * unrecoverable condition. 333 */ 334 if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR) 335 return -EIO; 336 337 /* Read the first 8 bytes in order to get the length of the response. 338 * We read exactly a quad word in order to make sure that the remaining 339 * reads will be aligned. 340 */ 341 memcpy_fromio(buf, priv->rsp, 8); 342 343 expected = be32_to_cpup((__be32 *)&buf[2]); 344 if (expected > count || expected < TPM_HEADER_SIZE) 345 return -EIO; 346 347 memcpy_fromio(&buf[8], &priv->rsp[8], expected - 8); 348 349 return expected; 350 } 351 352 static int crb_do_acpi_start(struct tpm_chip *chip) 353 { 354 union acpi_object *obj; 355 int rc; 356 357 obj = acpi_evaluate_dsm(chip->acpi_dev_handle, 358 &crb_acpi_start_guid, 359 CRB_ACPI_START_REVISION_ID, 360 CRB_ACPI_START_INDEX, 361 NULL); 362 if (!obj) 363 return -ENXIO; 364 rc = obj->integer.value == 0 ? 0 : -ENXIO; 365 ACPI_FREE(obj); 366 return rc; 367 } 368 369 #ifdef CONFIG_ARM64 370 /* 371 * This is a TPM Command Response Buffer start method that invokes a 372 * Secure Monitor Call to requrest the firmware to execute or cancel 373 * a TPM 2.0 command. 374 */ 375 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) 376 { 377 struct arm_smccc_res res; 378 379 arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res); 380 if (res.a0 != 0) { 381 dev_err(dev, 382 FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n", 383 res.a0); 384 return -EIO; 385 } 386 387 return 0; 388 } 389 #else 390 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id) 391 { 392 dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n"); 393 return -EINVAL; 394 } 395 #endif 396 397 static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len) 398 { 399 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 400 int rc = 0; 401 402 /* Zero the cancel register so that the next command will not get 403 * canceled. 404 */ 405 iowrite32(0, &priv->regs_t->ctrl_cancel); 406 407 if (len > priv->cmd_size) { 408 dev_err(&chip->dev, "invalid command count value %zd %d\n", 409 len, priv->cmd_size); 410 return -E2BIG; 411 } 412 413 /* Seems to be necessary for every command */ 414 if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) 415 __crb_cmd_ready(&chip->dev, priv); 416 417 memcpy_toio(priv->cmd, buf, len); 418 419 /* Make sure that cmd is populated before issuing start. */ 420 wmb(); 421 422 /* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs 423 * report only ACPI start but in practice seems to require both 424 * CRB start, hence invoking CRB start method if hid == MSFT0101. 425 */ 426 if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) || 427 (priv->sm == ACPI_TPM2_MEMORY_MAPPED) || 428 (!strcmp(priv->hid, "MSFT0101"))) 429 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); 430 431 if ((priv->sm == ACPI_TPM2_START_METHOD) || 432 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) 433 rc = crb_do_acpi_start(chip); 434 435 if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { 436 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); 437 rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id); 438 } 439 440 if (rc) 441 return rc; 442 443 return crb_try_pluton_doorbell(priv, false); 444 } 445 446 static void crb_cancel(struct tpm_chip *chip) 447 { 448 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 449 450 iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel); 451 452 if (((priv->sm == ACPI_TPM2_START_METHOD) || 453 (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) && 454 crb_do_acpi_start(chip)) 455 dev_err(&chip->dev, "ACPI Start failed\n"); 456 } 457 458 static bool crb_req_canceled(struct tpm_chip *chip, u8 status) 459 { 460 struct crb_priv *priv = dev_get_drvdata(&chip->dev); 461 u32 cancel = ioread32(&priv->regs_t->ctrl_cancel); 462 463 return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE; 464 } 465 466 static const struct tpm_class_ops tpm_crb = { 467 .flags = TPM_OPS_AUTO_STARTUP, 468 .status = crb_status, 469 .recv = crb_recv, 470 .send = crb_send, 471 .cancel = crb_cancel, 472 .req_canceled = crb_req_canceled, 473 .go_idle = crb_go_idle, 474 .cmd_ready = crb_cmd_ready, 475 .request_locality = crb_request_locality, 476 .relinquish_locality = crb_relinquish_locality, 477 .req_complete_mask = CRB_DRV_STS_COMPLETE, 478 .req_complete_val = CRB_DRV_STS_COMPLETE, 479 }; 480 481 static int crb_check_resource(struct acpi_resource *ares, void *data) 482 { 483 struct resource *iores_array = data; 484 struct resource_win win; 485 struct resource *res = &(win.res); 486 int i; 487 488 if (acpi_dev_resource_memory(ares, res) || 489 acpi_dev_resource_address_space(ares, &win)) { 490 for (i = 0; i < TPM_CRB_MAX_RESOURCES + 1; ++i) { 491 if (resource_type(iores_array + i) != IORESOURCE_MEM) { 492 iores_array[i] = *res; 493 iores_array[i].name = NULL; 494 break; 495 } 496 } 497 } 498 499 return 1; 500 } 501 502 static void __iomem *crb_map_res(struct device *dev, struct resource *iores, 503 void __iomem **iobase_ptr, u64 start, u32 size) 504 { 505 struct resource new_res = { 506 .start = start, 507 .end = start + size - 1, 508 .flags = IORESOURCE_MEM, 509 }; 510 511 /* Detect a 64 bit address on a 32 bit system */ 512 if (start != new_res.start) 513 return IOMEM_ERR_PTR(-EINVAL); 514 515 if (!iores) 516 return devm_ioremap_resource(dev, &new_res); 517 518 if (!*iobase_ptr) { 519 *iobase_ptr = devm_ioremap_resource(dev, iores); 520 if (IS_ERR(*iobase_ptr)) 521 return *iobase_ptr; 522 } 523 524 return *iobase_ptr + (new_res.start - iores->start); 525 } 526 527 /* 528 * Work around broken BIOSs that return inconsistent values from the ACPI 529 * region vs the registers. Trust the ACPI region. Such broken systems 530 * probably cannot send large TPM commands since the buffer will be truncated. 531 */ 532 static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res, 533 u64 start, u64 size) 534 { 535 if (io_res->start > start || io_res->end < start) 536 return size; 537 538 if (start + size - 1 <= io_res->end) 539 return size; 540 541 dev_err(dev, 542 FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n", 543 io_res, start, size); 544 545 return io_res->end - start + 1; 546 } 547 548 static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, 549 struct acpi_table_tpm2 *buf) 550 { 551 struct list_head acpi_resource_list; 552 struct resource iores_array[TPM_CRB_MAX_RESOURCES + 1] = { {0} }; 553 void __iomem *iobase_array[TPM_CRB_MAX_RESOURCES] = {NULL}; 554 struct device *dev = &device->dev; 555 struct resource *iores; 556 void __iomem **iobase_ptr; 557 int i; 558 u32 pa_high, pa_low; 559 u64 cmd_pa; 560 u32 cmd_size; 561 __le64 __rsp_pa; 562 u64 rsp_pa; 563 u32 rsp_size; 564 int ret; 565 566 /* 567 * Pluton sometimes does not define ACPI memory regions. 568 * Mapping is then done in crb_map_pluton 569 */ 570 if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) { 571 INIT_LIST_HEAD(&acpi_resource_list); 572 ret = acpi_dev_get_resources(device, &acpi_resource_list, 573 crb_check_resource, iores_array); 574 if (ret < 0) 575 return ret; 576 acpi_dev_free_resource_list(&acpi_resource_list); 577 578 if (resource_type(iores_array) != IORESOURCE_MEM) { 579 dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n"); 580 return -EINVAL; 581 } else if (resource_type(iores_array + TPM_CRB_MAX_RESOURCES) == 582 IORESOURCE_MEM) { 583 dev_warn(dev, "TPM2 ACPI table defines too many memory resources\n"); 584 memset(iores_array + TPM_CRB_MAX_RESOURCES, 585 0, sizeof(*iores_array)); 586 iores_array[TPM_CRB_MAX_RESOURCES].flags = 0; 587 } 588 } 589 590 iores = NULL; 591 iobase_ptr = NULL; 592 for (i = 0; resource_type(iores_array + i) == IORESOURCE_MEM; ++i) { 593 if (buf->control_address >= iores_array[i].start && 594 buf->control_address + sizeof(struct crb_regs_tail) - 1 <= 595 iores_array[i].end) { 596 iores = iores_array + i; 597 iobase_ptr = iobase_array + i; 598 break; 599 } 600 } 601 602 priv->regs_t = crb_map_res(dev, iores, iobase_ptr, buf->control_address, 603 sizeof(struct crb_regs_tail)); 604 605 if (IS_ERR(priv->regs_t)) 606 return PTR_ERR(priv->regs_t); 607 608 /* The ACPI IO region starts at the head area and continues to include 609 * the control area, as one nice sane region except for some older 610 * stuff that puts the control area outside the ACPI IO region. 611 */ 612 if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) || 613 (priv->sm == ACPI_TPM2_MEMORY_MAPPED)) { 614 if (iores && 615 buf->control_address == iores->start + 616 sizeof(*priv->regs_h)) 617 priv->regs_h = *iobase_ptr; 618 else 619 dev_warn(dev, FW_BUG "Bad ACPI memory layout"); 620 } 621 622 ret = __crb_request_locality(dev, priv, 0); 623 if (ret) 624 return ret; 625 626 /* 627 * PTT HW bug w/a: wake up the device to access 628 * possibly not retained registers. 629 */ 630 ret = __crb_cmd_ready(dev, priv); 631 if (ret) 632 goto out_relinquish_locality; 633 634 pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high); 635 pa_low = ioread32(&priv->regs_t->ctrl_cmd_pa_low); 636 cmd_pa = ((u64)pa_high << 32) | pa_low; 637 cmd_size = ioread32(&priv->regs_t->ctrl_cmd_size); 638 639 iores = NULL; 640 iobase_ptr = NULL; 641 for (i = 0; iores_array[i].end; ++i) { 642 if (cmd_pa >= iores_array[i].start && 643 cmd_pa <= iores_array[i].end) { 644 iores = iores_array + i; 645 iobase_ptr = iobase_array + i; 646 break; 647 } 648 } 649 650 if (iores) 651 cmd_size = crb_fixup_cmd_size(dev, iores, cmd_pa, cmd_size); 652 653 dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n", 654 pa_high, pa_low, cmd_size); 655 656 priv->cmd = crb_map_res(dev, iores, iobase_ptr, cmd_pa, cmd_size); 657 if (IS_ERR(priv->cmd)) { 658 ret = PTR_ERR(priv->cmd); 659 goto out; 660 } 661 662 memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8); 663 rsp_pa = le64_to_cpu(__rsp_pa); 664 rsp_size = ioread32(&priv->regs_t->ctrl_rsp_size); 665 666 iores = NULL; 667 iobase_ptr = NULL; 668 for (i = 0; resource_type(iores_array + i) == IORESOURCE_MEM; ++i) { 669 if (rsp_pa >= iores_array[i].start && 670 rsp_pa <= iores_array[i].end) { 671 iores = iores_array + i; 672 iobase_ptr = iobase_array + i; 673 break; 674 } 675 } 676 677 if (iores) 678 rsp_size = crb_fixup_cmd_size(dev, iores, rsp_pa, rsp_size); 679 680 if (cmd_pa != rsp_pa) { 681 priv->rsp = crb_map_res(dev, iores, iobase_ptr, 682 rsp_pa, rsp_size); 683 ret = PTR_ERR_OR_ZERO(priv->rsp); 684 goto out; 685 } 686 687 /* According to the PTP specification, overlapping command and response 688 * buffer sizes must be identical. 689 */ 690 if (cmd_size != rsp_size) { 691 dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical"); 692 ret = -EINVAL; 693 goto out; 694 } 695 696 priv->rsp = priv->cmd; 697 698 out: 699 if (!ret) 700 priv->cmd_size = cmd_size; 701 702 __crb_go_idle(dev, priv); 703 704 out_relinquish_locality: 705 706 __crb_relinquish_locality(dev, priv, 0); 707 708 return ret; 709 } 710 711 static int crb_map_pluton(struct device *dev, struct crb_priv *priv, 712 struct acpi_table_tpm2 *buf, struct tpm2_crb_pluton *crb_pluton) 713 { 714 priv->pluton_start_addr = crb_map_res(dev, NULL, NULL, 715 crb_pluton->start_addr, 4); 716 if (IS_ERR(priv->pluton_start_addr)) 717 return PTR_ERR(priv->pluton_start_addr); 718 719 priv->pluton_reply_addr = crb_map_res(dev, NULL, NULL, 720 crb_pluton->reply_addr, 4); 721 if (IS_ERR(priv->pluton_reply_addr)) 722 return PTR_ERR(priv->pluton_reply_addr); 723 724 return 0; 725 } 726 727 static int crb_acpi_add(struct acpi_device *device) 728 { 729 struct acpi_table_tpm2 *buf; 730 struct crb_priv *priv; 731 struct tpm_chip *chip; 732 struct device *dev = &device->dev; 733 struct tpm2_crb_smc *crb_smc; 734 struct tpm2_crb_pluton *crb_pluton; 735 acpi_status status; 736 u32 sm; 737 int rc; 738 739 status = acpi_get_table(ACPI_SIG_TPM2, 1, 740 (struct acpi_table_header **) &buf); 741 if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) { 742 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); 743 return -EINVAL; 744 } 745 746 /* Should the FIFO driver handle this? */ 747 sm = buf->start_method; 748 if (sm == ACPI_TPM2_MEMORY_MAPPED) { 749 rc = -ENODEV; 750 goto out; 751 } 752 753 priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL); 754 if (!priv) { 755 rc = -ENOMEM; 756 goto out; 757 } 758 759 if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { 760 if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) { 761 dev_err(dev, 762 FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n", 763 buf->header.length, 764 ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC); 765 rc = -EINVAL; 766 goto out; 767 } 768 crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf)); 769 priv->smc_func_id = crb_smc->smc_func_id; 770 } 771 772 if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) { 773 if (buf->header.length < (sizeof(*buf) + sizeof(*crb_pluton))) { 774 dev_err(dev, 775 FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n", 776 buf->header.length, 777 ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON); 778 rc = -EINVAL; 779 goto out; 780 } 781 crb_pluton = ACPI_ADD_PTR(struct tpm2_crb_pluton, buf, sizeof(*buf)); 782 rc = crb_map_pluton(dev, priv, buf, crb_pluton); 783 if (rc) 784 goto out; 785 } 786 787 priv->sm = sm; 788 priv->hid = acpi_device_hid(device); 789 790 rc = crb_map_io(device, priv, buf); 791 if (rc) 792 goto out; 793 794 chip = tpmm_chip_alloc(dev, &tpm_crb); 795 if (IS_ERR(chip)) { 796 rc = PTR_ERR(chip); 797 goto out; 798 } 799 800 dev_set_drvdata(&chip->dev, priv); 801 chip->acpi_dev_handle = device->handle; 802 chip->flags = TPM_CHIP_FLAG_TPM2; 803 804 rc = tpm_chip_bootstrap(chip); 805 if (rc) 806 goto out; 807 808 #ifdef CONFIG_X86 809 /* A quirk for https://www.amd.com/en/support/kb/faq/pa-410 */ 810 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && 811 priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) { 812 dev_info(dev, "Disabling hwrng\n"); 813 chip->flags |= TPM_CHIP_FLAG_HWRNG_DISABLED; 814 } 815 #endif /* CONFIG_X86 */ 816 817 rc = tpm_chip_register(chip); 818 819 out: 820 acpi_put_table((struct acpi_table_header *)buf); 821 return rc; 822 } 823 824 static void crb_acpi_remove(struct acpi_device *device) 825 { 826 struct device *dev = &device->dev; 827 struct tpm_chip *chip = dev_get_drvdata(dev); 828 829 tpm_chip_unregister(chip); 830 } 831 832 static const struct dev_pm_ops crb_pm = { 833 SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume) 834 }; 835 836 static const struct acpi_device_id crb_device_ids[] = { 837 {"MSFT0101", 0}, 838 {"", 0}, 839 }; 840 MODULE_DEVICE_TABLE(acpi, crb_device_ids); 841 842 static struct acpi_driver crb_acpi_driver = { 843 .name = "tpm_crb", 844 .ids = crb_device_ids, 845 .ops = { 846 .add = crb_acpi_add, 847 .remove = crb_acpi_remove, 848 }, 849 .drv = { 850 .pm = &crb_pm, 851 }, 852 }; 853 854 module_acpi_driver(crb_acpi_driver); 855 MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>"); 856 MODULE_DESCRIPTION("TPM2 Driver"); 857 MODULE_VERSION("0.1"); 858 MODULE_LICENSE("GPL"); 859