1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2005, 2006 IBM Corporation 4 * Copyright (C) 2014, 2015 Intel Corporation 5 * 6 * Authors: 7 * Leendert van Doorn <leendert@watson.ibm.com> 8 * Kylene Hall <kjhall@us.ibm.com> 9 * 10 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 11 * 12 * Device driver for TCG/TCPA TPM (trusted platform module). 13 * Specifications at www.trustedcomputinggroup.org 14 * 15 * This device driver implements the TPM interface as defined in 16 * the TCG TPM Interface Spec version 1.2, revision 1.0. 17 */ 18 #include <linux/init.h> 19 #include <linux/module.h> 20 #include <linux/moduleparam.h> 21 #include <linux/pnp.h> 22 #include <linux/slab.h> 23 #include <linux/interrupt.h> 24 #include <linux/wait.h> 25 #include <linux/acpi.h> 26 #include <linux/freezer.h> 27 #include <linux/dmi.h> 28 #include "tpm.h" 29 #include "tpm_tis_core.h" 30 31 #define TPM_TIS_MAX_UNHANDLED_IRQS 1000 32 33 static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value); 34 35 static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, 36 bool check_cancel, bool *canceled) 37 { 38 u8 status = chip->ops->status(chip); 39 40 *canceled = false; 41 if ((status & mask) == mask) 42 return true; 43 if (check_cancel && chip->ops->req_canceled(chip, status)) { 44 *canceled = true; 45 return true; 46 } 47 return false; 48 } 49 50 static u8 tpm_tis_filter_sts_mask(u8 int_mask, u8 sts_mask) 51 { 52 if (!(int_mask & TPM_INTF_STS_VALID_INT)) 53 sts_mask &= ~TPM_STS_VALID; 54 55 if (!(int_mask & TPM_INTF_DATA_AVAIL_INT)) 56 sts_mask &= ~TPM_STS_DATA_AVAIL; 57 58 if (!(int_mask & TPM_INTF_CMD_READY_INT)) 59 sts_mask &= ~TPM_STS_COMMAND_READY; 60 61 return sts_mask; 62 } 63 64 static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, 65 unsigned long timeout, wait_queue_head_t *queue, 66 bool check_cancel) 67 { 68 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 69 unsigned long stop; 70 long rc; 71 u8 status; 72 bool canceled = false; 73 u8 sts_mask; 74 int ret = 0; 75 76 /* check current status */ 77 status = chip->ops->status(chip); 78 if ((status & mask) == mask) 79 return 0; 80 81 sts_mask = mask & (TPM_STS_VALID | TPM_STS_DATA_AVAIL | 82 TPM_STS_COMMAND_READY); 83 /* check what status changes can be handled by irqs */ 84 sts_mask = tpm_tis_filter_sts_mask(priv->int_mask, sts_mask); 85 86 stop = jiffies + timeout; 87 /* process status changes with irq support */ 88 if (sts_mask) { 89 ret = -ETIME; 90 again: 91 timeout = stop - jiffies; 92 if ((long)timeout <= 0) 93 return -ETIME; 94 rc = wait_event_interruptible_timeout(*queue, 95 wait_for_tpm_stat_cond(chip, sts_mask, check_cancel, 96 &canceled), 97 timeout); 98 if (rc > 0) { 99 if (canceled) 100 return -ECANCELED; 101 ret = 0; 102 } 103 if (rc == -ERESTARTSYS && freezing(current)) { 104 clear_thread_flag(TIF_SIGPENDING); 105 goto again; 106 } 107 } 108 109 if (ret) 110 return ret; 111 112 mask &= ~sts_mask; 113 if (!mask) /* all done */ 114 return 0; 115 /* process status changes without irq support */ 116 do { 117 usleep_range(priv->timeout_min, priv->timeout_max); 118 status = chip->ops->status(chip); 119 if ((status & mask) == mask) 120 return 0; 121 } while (time_before(jiffies, stop)); 122 return -ETIME; 123 } 124 125 /* Before we attempt to access the TPM we must see that the valid bit is set. 126 * The specification says that this bit is 0 at reset and remains 0 until the 127 * 'TPM has gone through its self test and initialization and has established 128 * correct values in the other bits.' 129 */ 130 static int wait_startup(struct tpm_chip *chip, int l) 131 { 132 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 133 unsigned long stop = jiffies + chip->timeout_a; 134 135 do { 136 int rc; 137 u8 access; 138 139 rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access); 140 if (rc < 0) 141 return rc; 142 143 if (access & TPM_ACCESS_VALID) 144 return 0; 145 tpm_msleep(TPM_TIMEOUT); 146 } while (time_before(jiffies, stop)); 147 return -1; 148 } 149 150 static bool check_locality(struct tpm_chip *chip, int l) 151 { 152 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 153 int rc; 154 u8 access; 155 156 rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access); 157 if (rc < 0) 158 return false; 159 160 if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID 161 | TPM_ACCESS_REQUEST_USE)) == 162 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) { 163 priv->locality = l; 164 return true; 165 } 166 167 return false; 168 } 169 170 static int __tpm_tis_relinquish_locality(struct tpm_tis_data *priv, int l) 171 { 172 tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY); 173 174 return 0; 175 } 176 177 static int tpm_tis_relinquish_locality(struct tpm_chip *chip, int l) 178 { 179 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 180 181 mutex_lock(&priv->locality_count_mutex); 182 priv->locality_count--; 183 if (priv->locality_count == 0) 184 __tpm_tis_relinquish_locality(priv, l); 185 mutex_unlock(&priv->locality_count_mutex); 186 187 return 0; 188 } 189 190 static int __tpm_tis_request_locality(struct tpm_chip *chip, int l) 191 { 192 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 193 unsigned long stop, timeout; 194 long rc; 195 196 if (check_locality(chip, l)) 197 return l; 198 199 rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE); 200 if (rc < 0) 201 return rc; 202 203 stop = jiffies + chip->timeout_a; 204 205 if (chip->flags & TPM_CHIP_FLAG_IRQ) { 206 again: 207 timeout = stop - jiffies; 208 if ((long)timeout <= 0) 209 return -1; 210 rc = wait_event_interruptible_timeout(priv->int_queue, 211 (check_locality 212 (chip, l)), 213 timeout); 214 if (rc > 0) 215 return l; 216 if (rc == -ERESTARTSYS && freezing(current)) { 217 clear_thread_flag(TIF_SIGPENDING); 218 goto again; 219 } 220 } else { 221 /* wait for burstcount */ 222 do { 223 if (check_locality(chip, l)) 224 return l; 225 tpm_msleep(TPM_TIMEOUT); 226 } while (time_before(jiffies, stop)); 227 } 228 return -1; 229 } 230 231 static int tpm_tis_request_locality(struct tpm_chip *chip, int l) 232 { 233 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 234 int ret = 0; 235 236 mutex_lock(&priv->locality_count_mutex); 237 if (priv->locality_count == 0) 238 ret = __tpm_tis_request_locality(chip, l); 239 if (!ret) 240 priv->locality_count++; 241 mutex_unlock(&priv->locality_count_mutex); 242 return ret; 243 } 244 245 static u8 tpm_tis_status(struct tpm_chip *chip) 246 { 247 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 248 int rc; 249 u8 status; 250 251 rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status); 252 if (rc < 0) 253 return 0; 254 255 if (unlikely((status & TPM_STS_READ_ZERO) != 0)) { 256 if (!test_and_set_bit(TPM_TIS_INVALID_STATUS, &priv->flags)) { 257 /* 258 * If this trips, the chances are the read is 259 * returning 0xff because the locality hasn't been 260 * acquired. Usually because tpm_try_get_ops() hasn't 261 * been called before doing a TPM operation. 262 */ 263 dev_err(&chip->dev, "invalid TPM_STS.x 0x%02x, dumping stack for forensics\n", 264 status); 265 266 /* 267 * Dump stack for forensics, as invalid TPM_STS.x could be 268 * potentially triggered by impaired tpm_try_get_ops() or 269 * tpm_find_get_ops(). 270 */ 271 dump_stack(); 272 } 273 274 return 0; 275 } 276 277 return status; 278 } 279 280 static void tpm_tis_ready(struct tpm_chip *chip) 281 { 282 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 283 284 /* this causes the current command to be aborted */ 285 tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY); 286 } 287 288 static int get_burstcount(struct tpm_chip *chip) 289 { 290 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 291 unsigned long stop; 292 int burstcnt, rc; 293 u32 value; 294 295 /* wait for burstcount */ 296 if (chip->flags & TPM_CHIP_FLAG_TPM2) 297 stop = jiffies + chip->timeout_a; 298 else 299 stop = jiffies + chip->timeout_d; 300 do { 301 rc = tpm_tis_read32(priv, TPM_STS(priv->locality), &value); 302 if (rc < 0) 303 return rc; 304 305 burstcnt = (value >> 8) & 0xFFFF; 306 if (burstcnt) 307 return burstcnt; 308 usleep_range(TPM_TIMEOUT_USECS_MIN, TPM_TIMEOUT_USECS_MAX); 309 } while (time_before(jiffies, stop)); 310 return -EBUSY; 311 } 312 313 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) 314 { 315 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 316 int size = 0, burstcnt, rc; 317 318 while (size < count) { 319 rc = wait_for_tpm_stat(chip, 320 TPM_STS_DATA_AVAIL | TPM_STS_VALID, 321 chip->timeout_c, 322 &priv->read_queue, true); 323 if (rc < 0) 324 return rc; 325 burstcnt = get_burstcount(chip); 326 if (burstcnt < 0) { 327 dev_err(&chip->dev, "Unable to read burstcount\n"); 328 return burstcnt; 329 } 330 burstcnt = min_t(int, burstcnt, count - size); 331 332 rc = tpm_tis_read_bytes(priv, TPM_DATA_FIFO(priv->locality), 333 burstcnt, buf + size); 334 if (rc < 0) 335 return rc; 336 337 size += burstcnt; 338 } 339 return size; 340 } 341 342 static int tpm_tis_try_recv(struct tpm_chip *chip, u8 *buf, size_t count) 343 { 344 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 345 int size = 0; 346 int status; 347 u32 expected; 348 int rc; 349 350 size = recv_data(chip, buf, TPM_HEADER_SIZE); 351 /* read first 10 bytes, including tag, paramsize, and result */ 352 if (size < TPM_HEADER_SIZE) { 353 dev_err(&chip->dev, "Unable to read header\n"); 354 goto out; 355 } 356 357 expected = be32_to_cpu(*(__be32 *) (buf + 2)); 358 if (expected > count || expected < TPM_HEADER_SIZE) { 359 size = -EIO; 360 goto out; 361 } 362 363 rc = recv_data(chip, &buf[TPM_HEADER_SIZE], 364 expected - TPM_HEADER_SIZE); 365 if (rc < 0) { 366 size = rc; 367 goto out; 368 } 369 size += rc; 370 if (size < expected) { 371 dev_err(&chip->dev, "Unable to read remainder of result\n"); 372 size = -ETIME; 373 goto out; 374 } 375 376 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, 377 &priv->int_queue, false) < 0) { 378 size = -ETIME; 379 goto out; 380 } 381 status = tpm_tis_status(chip); 382 if (status & TPM_STS_DATA_AVAIL) { 383 dev_err(&chip->dev, "Error left over data\n"); 384 size = -EIO; 385 goto out; 386 } 387 388 rc = tpm_tis_verify_crc(priv, (size_t)size, buf); 389 if (rc < 0) { 390 dev_err(&chip->dev, "CRC mismatch for response.\n"); 391 size = rc; 392 goto out; 393 } 394 395 out: 396 return size; 397 } 398 399 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count) 400 { 401 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 402 unsigned int try; 403 int rc = 0; 404 405 if (count < TPM_HEADER_SIZE) 406 return -EIO; 407 408 for (try = 0; try < TPM_RETRY; try++) { 409 rc = tpm_tis_try_recv(chip, buf, count); 410 411 if (rc == -EIO) 412 /* Data transfer errors, indicated by EIO, can be 413 * recovered by rereading the response. 414 */ 415 tpm_tis_write8(priv, TPM_STS(priv->locality), 416 TPM_STS_RESPONSE_RETRY); 417 else 418 break; 419 } 420 421 tpm_tis_ready(chip); 422 423 return rc; 424 } 425 426 /* 427 * If interrupts are used (signaled by an irq set in the vendor structure) 428 * tpm.c can skip polling for the data to be available as the interrupt is 429 * waited for here 430 */ 431 static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len) 432 { 433 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 434 int rc, status, burstcnt; 435 size_t count = 0; 436 bool itpm = test_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags); 437 438 status = tpm_tis_status(chip); 439 if ((status & TPM_STS_COMMAND_READY) == 0) { 440 tpm_tis_ready(chip); 441 if (wait_for_tpm_stat 442 (chip, TPM_STS_COMMAND_READY, chip->timeout_b, 443 &priv->int_queue, false) < 0) { 444 rc = -ETIME; 445 goto out_err; 446 } 447 } 448 449 while (count < len - 1) { 450 burstcnt = get_burstcount(chip); 451 if (burstcnt < 0) { 452 dev_err(&chip->dev, "Unable to read burstcount\n"); 453 rc = burstcnt; 454 goto out_err; 455 } 456 burstcnt = min_t(int, burstcnt, len - count - 1); 457 rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality), 458 burstcnt, buf + count); 459 if (rc < 0) 460 goto out_err; 461 462 count += burstcnt; 463 464 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, 465 &priv->int_queue, false) < 0) { 466 if (test_bit(TPM_TIS_STATUS_VALID_RETRY, &priv->flags)) 467 rc = -EAGAIN; 468 else 469 rc = -ETIME; 470 goto out_err; 471 } 472 status = tpm_tis_status(chip); 473 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) { 474 rc = -EIO; 475 goto out_err; 476 } 477 } 478 479 /* write last byte */ 480 rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]); 481 if (rc < 0) 482 goto out_err; 483 484 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c, 485 &priv->int_queue, false) < 0) { 486 if (test_bit(TPM_TIS_STATUS_VALID_RETRY, &priv->flags)) 487 rc = -EAGAIN; 488 else 489 rc = -ETIME; 490 goto out_err; 491 } 492 status = tpm_tis_status(chip); 493 if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) { 494 rc = -EIO; 495 goto out_err; 496 } 497 498 rc = tpm_tis_verify_crc(priv, len, buf); 499 if (rc < 0) { 500 dev_err(&chip->dev, "CRC mismatch for command.\n"); 501 goto out_err; 502 } 503 504 return 0; 505 506 out_err: 507 tpm_tis_ready(chip); 508 return rc; 509 } 510 511 static void __tpm_tis_disable_interrupts(struct tpm_chip *chip) 512 { 513 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 514 u32 int_mask = 0; 515 516 tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &int_mask); 517 int_mask &= ~TPM_GLOBAL_INT_ENABLE; 518 tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), int_mask); 519 520 chip->flags &= ~TPM_CHIP_FLAG_IRQ; 521 } 522 523 static void tpm_tis_disable_interrupts(struct tpm_chip *chip) 524 { 525 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 526 527 if (priv->irq == 0) 528 return; 529 530 __tpm_tis_disable_interrupts(chip); 531 532 devm_free_irq(chip->dev.parent, priv->irq, chip); 533 priv->irq = 0; 534 } 535 536 /* 537 * If interrupts are used (signaled by an irq set in the vendor structure) 538 * tpm.c can skip polling for the data to be available as the interrupt is 539 * waited for here 540 */ 541 static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len) 542 { 543 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 544 int rc; 545 u32 ordinal; 546 unsigned long dur; 547 unsigned int try; 548 549 for (try = 0; try < TPM_RETRY; try++) { 550 rc = tpm_tis_send_data(chip, buf, len); 551 if (rc >= 0) 552 /* Data transfer done successfully */ 553 break; 554 else if (rc != -EAGAIN && rc != -EIO) 555 /* Data transfer failed, not recoverable */ 556 return rc; 557 558 usleep_range(priv->timeout_min, priv->timeout_max); 559 } 560 561 /* go and do it */ 562 rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO); 563 if (rc < 0) 564 goto out_err; 565 566 if (chip->flags & TPM_CHIP_FLAG_IRQ) { 567 ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); 568 569 dur = tpm_calc_ordinal_duration(chip, ordinal); 570 if (wait_for_tpm_stat 571 (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur, 572 &priv->read_queue, false) < 0) { 573 rc = -ETIME; 574 goto out_err; 575 } 576 } 577 return 0; 578 out_err: 579 tpm_tis_ready(chip); 580 return rc; 581 } 582 583 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) 584 { 585 int rc, irq; 586 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 587 588 if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || 589 test_bit(TPM_TIS_IRQ_TESTED, &priv->flags)) 590 return tpm_tis_send_main(chip, buf, len); 591 592 /* Verify receipt of the expected IRQ */ 593 irq = priv->irq; 594 priv->irq = 0; 595 chip->flags &= ~TPM_CHIP_FLAG_IRQ; 596 rc = tpm_tis_send_main(chip, buf, len); 597 priv->irq = irq; 598 chip->flags |= TPM_CHIP_FLAG_IRQ; 599 if (!test_bit(TPM_TIS_IRQ_TESTED, &priv->flags)) 600 tpm_msleep(1); 601 if (!test_bit(TPM_TIS_IRQ_TESTED, &priv->flags)) 602 tpm_tis_disable_interrupts(chip); 603 set_bit(TPM_TIS_IRQ_TESTED, &priv->flags); 604 return rc; 605 } 606 607 struct tis_vendor_durations_override { 608 u32 did_vid; 609 struct tpm1_version version; 610 unsigned long durations[3]; 611 }; 612 613 static const struct tis_vendor_durations_override vendor_dur_overrides[] = { 614 /* STMicroelectronics 0x104a */ 615 { 0x0000104a, 616 { 1, 2, 8, 28 }, 617 { (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } }, 618 }; 619 620 static void tpm_tis_update_durations(struct tpm_chip *chip, 621 unsigned long *duration_cap) 622 { 623 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 624 struct tpm1_version *version; 625 u32 did_vid; 626 int i, rc; 627 cap_t cap; 628 629 chip->duration_adjusted = false; 630 631 if (chip->ops->clk_enable != NULL) 632 chip->ops->clk_enable(chip, true); 633 634 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid); 635 if (rc < 0) { 636 dev_warn(&chip->dev, "%s: failed to read did_vid. %d\n", 637 __func__, rc); 638 goto out; 639 } 640 641 /* Try to get a TPM version 1.2 or 1.1 TPM_CAP_VERSION_INFO */ 642 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap, 643 "attempting to determine the 1.2 version", 644 sizeof(cap.version2)); 645 if (!rc) { 646 version = &cap.version2.version; 647 } else { 648 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap, 649 "attempting to determine the 1.1 version", 650 sizeof(cap.version1)); 651 652 if (rc) 653 goto out; 654 655 version = &cap.version1; 656 } 657 658 for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) { 659 if (vendor_dur_overrides[i].did_vid != did_vid) 660 continue; 661 662 if ((version->major == 663 vendor_dur_overrides[i].version.major) && 664 (version->minor == 665 vendor_dur_overrides[i].version.minor) && 666 (version->rev_major == 667 vendor_dur_overrides[i].version.rev_major) && 668 (version->rev_minor == 669 vendor_dur_overrides[i].version.rev_minor)) { 670 671 memcpy(duration_cap, 672 vendor_dur_overrides[i].durations, 673 sizeof(vendor_dur_overrides[i].durations)); 674 675 chip->duration_adjusted = true; 676 goto out; 677 } 678 } 679 680 out: 681 if (chip->ops->clk_enable != NULL) 682 chip->ops->clk_enable(chip, false); 683 } 684 685 struct tis_vendor_timeout_override { 686 u32 did_vid; 687 unsigned long timeout_us[4]; 688 }; 689 690 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = { 691 /* Atmel 3204 */ 692 { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000), 693 (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } }, 694 }; 695 696 static void tpm_tis_update_timeouts(struct tpm_chip *chip, 697 unsigned long *timeout_cap) 698 { 699 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 700 int i, rc; 701 u32 did_vid; 702 703 chip->timeout_adjusted = false; 704 705 if (chip->ops->clk_enable != NULL) 706 chip->ops->clk_enable(chip, true); 707 708 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid); 709 if (rc < 0) { 710 dev_warn(&chip->dev, "%s: failed to read did_vid: %d\n", 711 __func__, rc); 712 goto out; 713 } 714 715 for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) { 716 if (vendor_timeout_overrides[i].did_vid != did_vid) 717 continue; 718 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us, 719 sizeof(vendor_timeout_overrides[i].timeout_us)); 720 chip->timeout_adjusted = true; 721 } 722 723 out: 724 if (chip->ops->clk_enable != NULL) 725 chip->ops->clk_enable(chip, false); 726 727 return; 728 } 729 730 /* 731 * Early probing for iTPM with STS_DATA_EXPECT flaw. 732 * Try sending command without itpm flag set and if that 733 * fails, repeat with itpm flag set. 734 */ 735 static int probe_itpm(struct tpm_chip *chip) 736 { 737 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 738 int rc = 0; 739 static const u8 cmd_getticks[] = { 740 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, 741 0x00, 0x00, 0x00, 0xf1 742 }; 743 size_t len = sizeof(cmd_getticks); 744 u16 vendor; 745 746 if (test_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags)) 747 return 0; 748 749 rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor); 750 if (rc < 0) 751 return rc; 752 753 /* probe only iTPMS */ 754 if (vendor != TPM_VID_INTEL) 755 return 0; 756 757 if (tpm_tis_request_locality(chip, 0) != 0) 758 return -EBUSY; 759 760 rc = tpm_tis_send_data(chip, cmd_getticks, len); 761 if (rc == 0) 762 goto out; 763 764 tpm_tis_ready(chip); 765 766 set_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags); 767 768 rc = tpm_tis_send_data(chip, cmd_getticks, len); 769 if (rc == 0) 770 dev_info(&chip->dev, "Detected an iTPM.\n"); 771 else { 772 clear_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags); 773 rc = -EFAULT; 774 } 775 776 out: 777 tpm_tis_ready(chip); 778 tpm_tis_relinquish_locality(chip, priv->locality); 779 780 return rc; 781 } 782 783 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) 784 { 785 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 786 787 if (!test_bit(TPM_TIS_DEFAULT_CANCELLATION, &priv->flags)) { 788 switch (priv->manufacturer_id) { 789 case TPM_VID_WINBOND: 790 return ((status == TPM_STS_VALID) || 791 (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY))); 792 case TPM_VID_STM: 793 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)); 794 default: 795 break; 796 } 797 } 798 799 return status == TPM_STS_COMMAND_READY; 800 } 801 802 static irqreturn_t tpm_tis_revert_interrupts(struct tpm_chip *chip) 803 { 804 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 805 const char *product; 806 const char *vendor; 807 808 dev_warn(&chip->dev, FW_BUG 809 "TPM interrupt storm detected, polling instead\n"); 810 811 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 812 product = dmi_get_system_info(DMI_PRODUCT_VERSION); 813 814 if (vendor && product) { 815 dev_info(&chip->dev, 816 "Consider adding the following entry to tpm_tis_dmi_table:\n"); 817 dev_info(&chip->dev, "\tDMI_SYS_VENDOR: %s\n", vendor); 818 dev_info(&chip->dev, "\tDMI_PRODUCT_VERSION: %s\n", product); 819 } 820 821 if (tpm_tis_request_locality(chip, 0) != 0) 822 return IRQ_NONE; 823 824 __tpm_tis_disable_interrupts(chip); 825 tpm_tis_relinquish_locality(chip, 0); 826 827 schedule_work(&priv->free_irq_work); 828 829 return IRQ_HANDLED; 830 } 831 832 static irqreturn_t tpm_tis_update_unhandled_irqs(struct tpm_chip *chip) 833 { 834 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 835 irqreturn_t irqret = IRQ_HANDLED; 836 837 if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) 838 return IRQ_HANDLED; 839 840 if (time_after(jiffies, priv->last_unhandled_irq + HZ/10)) 841 priv->unhandled_irqs = 1; 842 else 843 priv->unhandled_irqs++; 844 845 priv->last_unhandled_irq = jiffies; 846 847 if (priv->unhandled_irqs > TPM_TIS_MAX_UNHANDLED_IRQS) 848 irqret = tpm_tis_revert_interrupts(chip); 849 850 return irqret; 851 } 852 853 static irqreturn_t tis_int_handler(int dummy, void *dev_id) 854 { 855 struct tpm_chip *chip = dev_id; 856 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 857 u32 interrupt; 858 int rc; 859 860 rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); 861 if (rc < 0) 862 goto err; 863 864 if (interrupt == 0) 865 goto err; 866 867 set_bit(TPM_TIS_IRQ_TESTED, &priv->flags); 868 if (interrupt & TPM_INTF_DATA_AVAIL_INT) 869 wake_up_interruptible(&priv->read_queue); 870 871 if (interrupt & 872 (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT | 873 TPM_INTF_CMD_READY_INT)) 874 wake_up_interruptible(&priv->int_queue); 875 876 /* Clear interrupts handled with TPM_EOI */ 877 tpm_tis_request_locality(chip, 0); 878 rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt); 879 tpm_tis_relinquish_locality(chip, 0); 880 if (rc < 0) 881 goto err; 882 883 tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); 884 return IRQ_HANDLED; 885 886 err: 887 return tpm_tis_update_unhandled_irqs(chip); 888 } 889 890 static void tpm_tis_gen_interrupt(struct tpm_chip *chip) 891 { 892 const char *desc = "attempting to generate an interrupt"; 893 u32 cap2; 894 cap_t cap; 895 int ret; 896 897 chip->flags |= TPM_CHIP_FLAG_IRQ; 898 899 if (chip->flags & TPM_CHIP_FLAG_TPM2) 900 ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); 901 else 902 ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0); 903 904 if (ret) 905 chip->flags &= ~TPM_CHIP_FLAG_IRQ; 906 } 907 908 static void tpm_tis_free_irq_func(struct work_struct *work) 909 { 910 struct tpm_tis_data *priv = container_of(work, typeof(*priv), free_irq_work); 911 struct tpm_chip *chip = priv->chip; 912 913 devm_free_irq(chip->dev.parent, priv->irq, chip); 914 priv->irq = 0; 915 } 916 917 /* Register the IRQ and issue a command that will cause an interrupt. If an 918 * irq is seen then leave the chip setup for IRQ operation, otherwise reverse 919 * everything and leave in polling mode. Returns 0 on success. 920 */ 921 static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, 922 int flags, int irq) 923 { 924 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 925 u8 original_int_vec; 926 int rc; 927 u32 int_status; 928 929 rc = devm_request_threaded_irq(chip->dev.parent, irq, NULL, 930 tis_int_handler, IRQF_ONESHOT | flags, 931 dev_name(&chip->dev), chip); 932 if (rc) { 933 dev_info(&chip->dev, "Unable to request irq: %d for probe\n", 934 irq); 935 return -1; 936 } 937 priv->irq = irq; 938 939 rc = tpm_tis_request_locality(chip, 0); 940 if (rc < 0) 941 return rc; 942 943 rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), 944 &original_int_vec); 945 if (rc < 0) { 946 tpm_tis_relinquish_locality(chip, priv->locality); 947 return rc; 948 } 949 950 rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq); 951 if (rc < 0) 952 goto restore_irqs; 953 954 rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status); 955 if (rc < 0) 956 goto restore_irqs; 957 958 /* Clear all existing */ 959 rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status); 960 if (rc < 0) 961 goto restore_irqs; 962 /* Turn on */ 963 rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), 964 intmask | TPM_GLOBAL_INT_ENABLE); 965 if (rc < 0) 966 goto restore_irqs; 967 968 clear_bit(TPM_TIS_IRQ_TESTED, &priv->flags); 969 970 /* Generate an interrupt by having the core call through to 971 * tpm_tis_send 972 */ 973 tpm_tis_gen_interrupt(chip); 974 975 restore_irqs: 976 /* tpm_tis_send will either confirm the interrupt is working or it 977 * will call disable_irq which undoes all of the above. 978 */ 979 if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) { 980 tpm_tis_write8(priv, original_int_vec, 981 TPM_INT_VECTOR(priv->locality)); 982 rc = -1; 983 } 984 985 tpm_tis_relinquish_locality(chip, priv->locality); 986 987 return rc; 988 } 989 990 /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that 991 * do not have ACPI/etc. We typically expect the interrupt to be declared if 992 * present. 993 */ 994 static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask) 995 { 996 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 997 u8 original_int_vec; 998 int i, rc; 999 1000 rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), 1001 &original_int_vec); 1002 if (rc < 0) 1003 return; 1004 1005 if (!original_int_vec) { 1006 if (IS_ENABLED(CONFIG_X86)) 1007 for (i = 3; i <= 15; i++) 1008 if (!tpm_tis_probe_irq_single(chip, intmask, 0, 1009 i)) 1010 return; 1011 } else if (!tpm_tis_probe_irq_single(chip, intmask, 0, 1012 original_int_vec)) 1013 return; 1014 } 1015 1016 void tpm_tis_remove(struct tpm_chip *chip) 1017 { 1018 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 1019 u32 reg = TPM_INT_ENABLE(priv->locality); 1020 u32 interrupt; 1021 int rc; 1022 1023 tpm_tis_clkrun_enable(chip, true); 1024 1025 rc = tpm_tis_read32(priv, reg, &interrupt); 1026 if (rc < 0) 1027 interrupt = 0; 1028 1029 tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt); 1030 if (priv->free_irq_work.func) 1031 flush_work(&priv->free_irq_work); 1032 1033 tpm_tis_clkrun_enable(chip, false); 1034 1035 if (priv->ilb_base_addr) 1036 iounmap(priv->ilb_base_addr); 1037 } 1038 EXPORT_SYMBOL_GPL(tpm_tis_remove); 1039 1040 /** 1041 * tpm_tis_clkrun_enable() - Keep clkrun protocol disabled for entire duration 1042 * of a single TPM command 1043 * @chip: TPM chip to use 1044 * @value: 1 - Disable CLKRUN protocol, so that clocks are free running 1045 * 0 - Enable CLKRUN protocol 1046 * Call this function directly in tpm_tis_remove() in error or driver removal 1047 * path, since the chip->ops is set to NULL in tpm_chip_unregister(). 1048 */ 1049 static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value) 1050 { 1051 struct tpm_tis_data *data = dev_get_drvdata(&chip->dev); 1052 u32 clkrun_val; 1053 1054 if (!IS_ENABLED(CONFIG_X86) || !is_bsw() || 1055 !data->ilb_base_addr) 1056 return; 1057 1058 if (value) { 1059 data->clkrun_enabled++; 1060 if (data->clkrun_enabled > 1) 1061 return; 1062 clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET); 1063 1064 /* Disable LPC CLKRUN# */ 1065 clkrun_val &= ~LPC_CLKRUN_EN; 1066 iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET); 1067 1068 } else { 1069 data->clkrun_enabled--; 1070 if (data->clkrun_enabled) 1071 return; 1072 1073 clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET); 1074 1075 /* Enable LPC CLKRUN# */ 1076 clkrun_val |= LPC_CLKRUN_EN; 1077 iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET); 1078 } 1079 1080 #ifdef CONFIG_HAS_IOPORT 1081 /* 1082 * Write any random value on port 0x80 which is on LPC, to make 1083 * sure LPC clock is running before sending any TPM command. 1084 */ 1085 outb(0xCC, 0x80); 1086 #endif 1087 } 1088 1089 static const struct tpm_class_ops tpm_tis = { 1090 .flags = TPM_OPS_AUTO_STARTUP, 1091 .status = tpm_tis_status, 1092 .recv = tpm_tis_recv, 1093 .send = tpm_tis_send, 1094 .cancel = tpm_tis_ready, 1095 .update_timeouts = tpm_tis_update_timeouts, 1096 .update_durations = tpm_tis_update_durations, 1097 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, 1098 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, 1099 .req_canceled = tpm_tis_req_canceled, 1100 .request_locality = tpm_tis_request_locality, 1101 .relinquish_locality = tpm_tis_relinquish_locality, 1102 .clk_enable = tpm_tis_clkrun_enable, 1103 }; 1104 1105 int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, 1106 const struct tpm_tis_phy_ops *phy_ops, 1107 acpi_handle acpi_dev_handle) 1108 { 1109 u32 vendor; 1110 u32 intfcaps; 1111 u32 intmask; 1112 u32 clkrun_val; 1113 u8 rid; 1114 int rc, probe; 1115 struct tpm_chip *chip; 1116 1117 chip = tpmm_chip_alloc(dev, &tpm_tis); 1118 if (IS_ERR(chip)) 1119 return PTR_ERR(chip); 1120 1121 #ifdef CONFIG_ACPI 1122 chip->acpi_dev_handle = acpi_dev_handle; 1123 #endif 1124 1125 chip->hwrng.quality = priv->rng_quality; 1126 1127 /* Maximum timeouts */ 1128 chip->timeout_a = msecs_to_jiffies(TIS_TIMEOUT_A_MAX); 1129 chip->timeout_b = msecs_to_jiffies(TIS_TIMEOUT_B_MAX); 1130 chip->timeout_c = msecs_to_jiffies(TIS_TIMEOUT_C_MAX); 1131 chip->timeout_d = msecs_to_jiffies(TIS_TIMEOUT_D_MAX); 1132 priv->chip = chip; 1133 priv->timeout_min = TPM_TIMEOUT_USECS_MIN; 1134 priv->timeout_max = TPM_TIMEOUT_USECS_MAX; 1135 priv->phy_ops = phy_ops; 1136 priv->locality_count = 0; 1137 mutex_init(&priv->locality_count_mutex); 1138 INIT_WORK(&priv->free_irq_work, tpm_tis_free_irq_func); 1139 1140 dev_set_drvdata(&chip->dev, priv); 1141 1142 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor); 1143 if (rc < 0) 1144 return rc; 1145 1146 priv->manufacturer_id = vendor; 1147 1148 if (priv->manufacturer_id == TPM_VID_ATML && 1149 !(chip->flags & TPM_CHIP_FLAG_TPM2)) { 1150 priv->timeout_min = TIS_TIMEOUT_MIN_ATML; 1151 priv->timeout_max = TIS_TIMEOUT_MAX_ATML; 1152 } 1153 1154 if (priv->manufacturer_id == TPM_VID_IFX) 1155 set_bit(TPM_TIS_STATUS_VALID_RETRY, &priv->flags); 1156 1157 if (is_bsw()) { 1158 priv->ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR, 1159 ILB_REMAP_SIZE); 1160 if (!priv->ilb_base_addr) 1161 return -ENOMEM; 1162 1163 clkrun_val = ioread32(priv->ilb_base_addr + LPC_CNTRL_OFFSET); 1164 /* Check if CLKRUN# is already not enabled in the LPC bus */ 1165 if (!(clkrun_val & LPC_CLKRUN_EN)) { 1166 iounmap(priv->ilb_base_addr); 1167 priv->ilb_base_addr = NULL; 1168 } 1169 } 1170 1171 if (chip->ops->clk_enable != NULL) 1172 chip->ops->clk_enable(chip, true); 1173 1174 if (wait_startup(chip, 0) != 0) { 1175 rc = -ENODEV; 1176 goto out_err; 1177 } 1178 1179 /* Take control of the TPM's interrupt hardware and shut it off */ 1180 rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); 1181 if (rc < 0) 1182 goto out_err; 1183 1184 /* Figure out the capabilities */ 1185 rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps); 1186 if (rc < 0) 1187 goto out_err; 1188 1189 dev_dbg(dev, "TPM interface capabilities (0x%x):\n", 1190 intfcaps); 1191 if (intfcaps & TPM_INTF_BURST_COUNT_STATIC) 1192 dev_dbg(dev, "\tBurst Count Static\n"); 1193 if (intfcaps & TPM_INTF_CMD_READY_INT) { 1194 intmask |= TPM_INTF_CMD_READY_INT; 1195 dev_dbg(dev, "\tCommand Ready Int Support\n"); 1196 } 1197 if (intfcaps & TPM_INTF_INT_EDGE_FALLING) 1198 dev_dbg(dev, "\tInterrupt Edge Falling\n"); 1199 if (intfcaps & TPM_INTF_INT_EDGE_RISING) 1200 dev_dbg(dev, "\tInterrupt Edge Rising\n"); 1201 if (intfcaps & TPM_INTF_INT_LEVEL_LOW) 1202 dev_dbg(dev, "\tInterrupt Level Low\n"); 1203 if (intfcaps & TPM_INTF_INT_LEVEL_HIGH) 1204 dev_dbg(dev, "\tInterrupt Level High\n"); 1205 if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT) { 1206 intmask |= TPM_INTF_LOCALITY_CHANGE_INT; 1207 dev_dbg(dev, "\tLocality Change Int Support\n"); 1208 } 1209 if (intfcaps & TPM_INTF_STS_VALID_INT) { 1210 intmask |= TPM_INTF_STS_VALID_INT; 1211 dev_dbg(dev, "\tSts Valid Int Support\n"); 1212 } 1213 if (intfcaps & TPM_INTF_DATA_AVAIL_INT) { 1214 intmask |= TPM_INTF_DATA_AVAIL_INT; 1215 dev_dbg(dev, "\tData Avail Int Support\n"); 1216 } 1217 1218 intmask &= ~TPM_GLOBAL_INT_ENABLE; 1219 1220 rc = tpm_tis_request_locality(chip, 0); 1221 if (rc < 0) { 1222 rc = -ENODEV; 1223 goto out_err; 1224 } 1225 1226 tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); 1227 tpm_tis_relinquish_locality(chip, 0); 1228 1229 rc = tpm_chip_start(chip); 1230 if (rc) 1231 goto out_err; 1232 rc = tpm2_probe(chip); 1233 tpm_chip_stop(chip); 1234 if (rc) 1235 goto out_err; 1236 1237 rc = tpm_tis_read8(priv, TPM_RID(0), &rid); 1238 if (rc < 0) 1239 goto out_err; 1240 1241 dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n", 1242 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2", 1243 vendor >> 16, rid); 1244 1245 probe = probe_itpm(chip); 1246 if (probe < 0) { 1247 rc = -ENODEV; 1248 goto out_err; 1249 } 1250 1251 /* INTERRUPT Setup */ 1252 init_waitqueue_head(&priv->read_queue); 1253 init_waitqueue_head(&priv->int_queue); 1254 1255 rc = tpm_chip_bootstrap(chip); 1256 if (rc) 1257 goto out_err; 1258 1259 if (irq != -1) { 1260 /* 1261 * Before doing irq testing issue a command to the TPM in polling mode 1262 * to make sure it works. May as well use that command to set the 1263 * proper timeouts for the driver. 1264 */ 1265 1266 rc = tpm_tis_request_locality(chip, 0); 1267 if (rc < 0) 1268 goto out_err; 1269 1270 rc = tpm_get_timeouts(chip); 1271 1272 tpm_tis_relinquish_locality(chip, 0); 1273 1274 if (rc) { 1275 dev_err(dev, "Could not get TPM timeouts and durations\n"); 1276 rc = -ENODEV; 1277 goto out_err; 1278 } 1279 1280 if (irq) 1281 tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED, 1282 irq); 1283 else 1284 tpm_tis_probe_irq(chip, intmask); 1285 1286 if (chip->flags & TPM_CHIP_FLAG_IRQ) { 1287 priv->int_mask = intmask; 1288 } else { 1289 dev_err(&chip->dev, FW_BUG 1290 "TPM interrupt not working, polling instead\n"); 1291 1292 rc = tpm_tis_request_locality(chip, 0); 1293 if (rc < 0) 1294 goto out_err; 1295 tpm_tis_disable_interrupts(chip); 1296 tpm_tis_relinquish_locality(chip, 0); 1297 } 1298 } 1299 1300 rc = tpm_chip_register(chip); 1301 if (rc) 1302 goto out_err; 1303 1304 if (chip->ops->clk_enable != NULL) 1305 chip->ops->clk_enable(chip, false); 1306 1307 return 0; 1308 out_err: 1309 if (chip->ops->clk_enable != NULL) 1310 chip->ops->clk_enable(chip, false); 1311 1312 tpm_tis_remove(chip); 1313 1314 return rc; 1315 } 1316 EXPORT_SYMBOL_GPL(tpm_tis_core_init); 1317 1318 #ifdef CONFIG_PM_SLEEP 1319 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) 1320 { 1321 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 1322 u32 intmask; 1323 int rc; 1324 1325 /* 1326 * Re-enable interrupts that device may have lost or BIOS/firmware may 1327 * have disabled. 1328 */ 1329 rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq); 1330 if (rc < 0) { 1331 dev_err(&chip->dev, "Setting IRQ failed.\n"); 1332 return; 1333 } 1334 1335 intmask = priv->int_mask | TPM_GLOBAL_INT_ENABLE; 1336 rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); 1337 if (rc < 0) 1338 dev_err(&chip->dev, "Enabling interrupts failed.\n"); 1339 } 1340 1341 int tpm_tis_resume(struct device *dev) 1342 { 1343 struct tpm_chip *chip = dev_get_drvdata(dev); 1344 int ret; 1345 1346 ret = tpm_chip_start(chip); 1347 if (ret) 1348 return ret; 1349 1350 if (chip->flags & TPM_CHIP_FLAG_IRQ) 1351 tpm_tis_reenable_interrupts(chip); 1352 1353 /* 1354 * TPM 1.2 requires self-test on resume. This function actually returns 1355 * an error code but for unknown reason it isn't handled. 1356 */ 1357 if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) 1358 tpm1_do_selftest(chip); 1359 1360 tpm_chip_stop(chip); 1361 1362 ret = tpm_pm_resume(dev); 1363 if (ret) 1364 return ret; 1365 1366 return 0; 1367 } 1368 EXPORT_SYMBOL_GPL(tpm_tis_resume); 1369 #endif 1370 1371 MODULE_AUTHOR("Leendert van Doorn <leendert@watson.ibm.com>"); 1372 MODULE_DESCRIPTION("TPM Driver"); 1373 MODULE_VERSION("2.0"); 1374 MODULE_LICENSE("GPL"); 1375