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 bufsiz, 584 size_t len) 585 { 586 int rc, irq; 587 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 588 589 if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || 590 test_bit(TPM_TIS_IRQ_TESTED, &priv->flags)) 591 return tpm_tis_send_main(chip, buf, len); 592 593 /* Verify receipt of the expected IRQ */ 594 irq = priv->irq; 595 priv->irq = 0; 596 chip->flags &= ~TPM_CHIP_FLAG_IRQ; 597 rc = tpm_tis_send_main(chip, buf, len); 598 priv->irq = irq; 599 chip->flags |= TPM_CHIP_FLAG_IRQ; 600 if (!test_bit(TPM_TIS_IRQ_TESTED, &priv->flags)) 601 tpm_msleep(1); 602 if (!test_bit(TPM_TIS_IRQ_TESTED, &priv->flags)) 603 tpm_tis_disable_interrupts(chip); 604 set_bit(TPM_TIS_IRQ_TESTED, &priv->flags); 605 return rc; 606 } 607 608 struct tis_vendor_durations_override { 609 u32 did_vid; 610 struct tpm1_version version; 611 unsigned long durations[3]; 612 }; 613 614 static const struct tis_vendor_durations_override vendor_dur_overrides[] = { 615 /* STMicroelectronics 0x104a */ 616 { 0x0000104a, 617 { 1, 2, 8, 28 }, 618 { (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } }, 619 }; 620 621 static void tpm_tis_update_durations(struct tpm_chip *chip, 622 unsigned long *duration_cap) 623 { 624 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 625 struct tpm1_version *version; 626 u32 did_vid; 627 int i, rc; 628 cap_t cap; 629 630 chip->duration_adjusted = false; 631 632 if (chip->ops->clk_enable != NULL) 633 chip->ops->clk_enable(chip, true); 634 635 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid); 636 if (rc < 0) { 637 dev_warn(&chip->dev, "%s: failed to read did_vid. %d\n", 638 __func__, rc); 639 goto out; 640 } 641 642 /* Try to get a TPM version 1.2 or 1.1 TPM_CAP_VERSION_INFO */ 643 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap, 644 "attempting to determine the 1.2 version", 645 sizeof(cap.version2)); 646 if (!rc) { 647 version = &cap.version2.version; 648 } else { 649 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap, 650 "attempting to determine the 1.1 version", 651 sizeof(cap.version1)); 652 653 if (rc) 654 goto out; 655 656 version = &cap.version1; 657 } 658 659 for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) { 660 if (vendor_dur_overrides[i].did_vid != did_vid) 661 continue; 662 663 if ((version->major == 664 vendor_dur_overrides[i].version.major) && 665 (version->minor == 666 vendor_dur_overrides[i].version.minor) && 667 (version->rev_major == 668 vendor_dur_overrides[i].version.rev_major) && 669 (version->rev_minor == 670 vendor_dur_overrides[i].version.rev_minor)) { 671 672 memcpy(duration_cap, 673 vendor_dur_overrides[i].durations, 674 sizeof(vendor_dur_overrides[i].durations)); 675 676 chip->duration_adjusted = true; 677 goto out; 678 } 679 } 680 681 out: 682 if (chip->ops->clk_enable != NULL) 683 chip->ops->clk_enable(chip, false); 684 } 685 686 struct tis_vendor_timeout_override { 687 u32 did_vid; 688 unsigned long timeout_us[4]; 689 }; 690 691 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = { 692 /* Atmel 3204 */ 693 { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000), 694 (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } }, 695 }; 696 697 static void tpm_tis_update_timeouts(struct tpm_chip *chip, 698 unsigned long *timeout_cap) 699 { 700 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 701 int i, rc; 702 u32 did_vid; 703 704 chip->timeout_adjusted = false; 705 706 if (chip->ops->clk_enable != NULL) 707 chip->ops->clk_enable(chip, true); 708 709 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid); 710 if (rc < 0) { 711 dev_warn(&chip->dev, "%s: failed to read did_vid: %d\n", 712 __func__, rc); 713 goto out; 714 } 715 716 for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) { 717 if (vendor_timeout_overrides[i].did_vid != did_vid) 718 continue; 719 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us, 720 sizeof(vendor_timeout_overrides[i].timeout_us)); 721 chip->timeout_adjusted = true; 722 } 723 724 out: 725 if (chip->ops->clk_enable != NULL) 726 chip->ops->clk_enable(chip, false); 727 728 return; 729 } 730 731 /* 732 * Early probing for iTPM with STS_DATA_EXPECT flaw. 733 * Try sending command without itpm flag set and if that 734 * fails, repeat with itpm flag set. 735 */ 736 static int probe_itpm(struct tpm_chip *chip) 737 { 738 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 739 int rc = 0; 740 static const u8 cmd_getticks[] = { 741 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, 742 0x00, 0x00, 0x00, 0xf1 743 }; 744 size_t len = sizeof(cmd_getticks); 745 u16 vendor; 746 747 if (test_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags)) 748 return 0; 749 750 rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor); 751 if (rc < 0) 752 return rc; 753 754 /* probe only iTPMS */ 755 if (vendor != TPM_VID_INTEL) 756 return 0; 757 758 if (tpm_tis_request_locality(chip, 0) != 0) 759 return -EBUSY; 760 761 rc = tpm_tis_send_data(chip, cmd_getticks, len); 762 if (rc == 0) 763 goto out; 764 765 tpm_tis_ready(chip); 766 767 set_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags); 768 769 rc = tpm_tis_send_data(chip, cmd_getticks, len); 770 if (rc == 0) 771 dev_info(&chip->dev, "Detected an iTPM.\n"); 772 else { 773 clear_bit(TPM_TIS_ITPM_WORKAROUND, &priv->flags); 774 rc = -EFAULT; 775 } 776 777 out: 778 tpm_tis_ready(chip); 779 tpm_tis_relinquish_locality(chip, priv->locality); 780 781 return rc; 782 } 783 784 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) 785 { 786 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 787 788 if (!test_bit(TPM_TIS_DEFAULT_CANCELLATION, &priv->flags)) { 789 switch (priv->manufacturer_id) { 790 case TPM_VID_WINBOND: 791 return ((status == TPM_STS_VALID) || 792 (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY))); 793 case TPM_VID_STM: 794 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)); 795 default: 796 break; 797 } 798 } 799 800 return status == TPM_STS_COMMAND_READY; 801 } 802 803 static irqreturn_t tpm_tis_revert_interrupts(struct tpm_chip *chip) 804 { 805 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 806 const char *product; 807 const char *vendor; 808 809 dev_warn(&chip->dev, FW_BUG 810 "TPM interrupt storm detected, polling instead\n"); 811 812 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 813 product = dmi_get_system_info(DMI_PRODUCT_VERSION); 814 815 if (vendor && product) { 816 dev_info(&chip->dev, 817 "Consider adding the following entry to tpm_tis_dmi_table:\n"); 818 dev_info(&chip->dev, "\tDMI_SYS_VENDOR: %s\n", vendor); 819 dev_info(&chip->dev, "\tDMI_PRODUCT_VERSION: %s\n", product); 820 } 821 822 if (tpm_tis_request_locality(chip, 0) != 0) 823 return IRQ_NONE; 824 825 __tpm_tis_disable_interrupts(chip); 826 tpm_tis_relinquish_locality(chip, 0); 827 828 schedule_work(&priv->free_irq_work); 829 830 return IRQ_HANDLED; 831 } 832 833 static irqreturn_t tpm_tis_update_unhandled_irqs(struct tpm_chip *chip) 834 { 835 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 836 irqreturn_t irqret = IRQ_HANDLED; 837 838 if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) 839 return IRQ_HANDLED; 840 841 if (time_after(jiffies, priv->last_unhandled_irq + HZ/10)) 842 priv->unhandled_irqs = 1; 843 else 844 priv->unhandled_irqs++; 845 846 priv->last_unhandled_irq = jiffies; 847 848 if (priv->unhandled_irqs > TPM_TIS_MAX_UNHANDLED_IRQS) 849 irqret = tpm_tis_revert_interrupts(chip); 850 851 return irqret; 852 } 853 854 static irqreturn_t tis_int_handler(int dummy, void *dev_id) 855 { 856 struct tpm_chip *chip = dev_id; 857 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 858 u32 interrupt; 859 int rc; 860 861 rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); 862 if (rc < 0) 863 goto err; 864 865 if (interrupt == 0) 866 goto err; 867 868 set_bit(TPM_TIS_IRQ_TESTED, &priv->flags); 869 if (interrupt & TPM_INTF_DATA_AVAIL_INT) 870 wake_up_interruptible(&priv->read_queue); 871 872 if (interrupt & 873 (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT | 874 TPM_INTF_CMD_READY_INT)) 875 wake_up_interruptible(&priv->int_queue); 876 877 /* Clear interrupts handled with TPM_EOI */ 878 tpm_tis_request_locality(chip, 0); 879 rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt); 880 tpm_tis_relinquish_locality(chip, 0); 881 if (rc < 0) 882 goto err; 883 884 tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); 885 return IRQ_HANDLED; 886 887 err: 888 return tpm_tis_update_unhandled_irqs(chip); 889 } 890 891 static void tpm_tis_gen_interrupt(struct tpm_chip *chip) 892 { 893 const char *desc = "attempting to generate an interrupt"; 894 u32 cap2; 895 cap_t cap; 896 int ret; 897 898 chip->flags |= TPM_CHIP_FLAG_IRQ; 899 900 if (chip->flags & TPM_CHIP_FLAG_TPM2) 901 ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); 902 else 903 ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0); 904 905 if (ret) 906 chip->flags &= ~TPM_CHIP_FLAG_IRQ; 907 } 908 909 static void tpm_tis_free_irq_func(struct work_struct *work) 910 { 911 struct tpm_tis_data *priv = container_of(work, typeof(*priv), free_irq_work); 912 struct tpm_chip *chip = priv->chip; 913 914 devm_free_irq(chip->dev.parent, priv->irq, chip); 915 priv->irq = 0; 916 } 917 918 /* Register the IRQ and issue a command that will cause an interrupt. If an 919 * irq is seen then leave the chip setup for IRQ operation, otherwise reverse 920 * everything and leave in polling mode. Returns 0 on success. 921 */ 922 static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, 923 int flags, int irq) 924 { 925 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 926 u8 original_int_vec; 927 int rc; 928 u32 int_status; 929 930 rc = devm_request_threaded_irq(chip->dev.parent, irq, NULL, 931 tis_int_handler, IRQF_ONESHOT | flags, 932 dev_name(&chip->dev), chip); 933 if (rc) { 934 dev_info(&chip->dev, "Unable to request irq: %d for probe\n", 935 irq); 936 return -1; 937 } 938 priv->irq = irq; 939 940 rc = tpm_tis_request_locality(chip, 0); 941 if (rc < 0) 942 return rc; 943 944 rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), 945 &original_int_vec); 946 if (rc < 0) { 947 tpm_tis_relinquish_locality(chip, priv->locality); 948 return rc; 949 } 950 951 rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq); 952 if (rc < 0) 953 goto restore_irqs; 954 955 rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status); 956 if (rc < 0) 957 goto restore_irqs; 958 959 /* Clear all existing */ 960 rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status); 961 if (rc < 0) 962 goto restore_irqs; 963 /* Turn on */ 964 rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), 965 intmask | TPM_GLOBAL_INT_ENABLE); 966 if (rc < 0) 967 goto restore_irqs; 968 969 clear_bit(TPM_TIS_IRQ_TESTED, &priv->flags); 970 971 /* Generate an interrupt by having the core call through to 972 * tpm_tis_send 973 */ 974 tpm_tis_gen_interrupt(chip); 975 976 restore_irqs: 977 /* tpm_tis_send will either confirm the interrupt is working or it 978 * will call disable_irq which undoes all of the above. 979 */ 980 if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) { 981 tpm_tis_write8(priv, original_int_vec, 982 TPM_INT_VECTOR(priv->locality)); 983 rc = -1; 984 } 985 986 tpm_tis_relinquish_locality(chip, priv->locality); 987 988 return rc; 989 } 990 991 /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that 992 * do not have ACPI/etc. We typically expect the interrupt to be declared if 993 * present. 994 */ 995 static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask) 996 { 997 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 998 u8 original_int_vec; 999 int i, rc; 1000 1001 rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality), 1002 &original_int_vec); 1003 if (rc < 0) 1004 return; 1005 1006 if (!original_int_vec) { 1007 if (IS_ENABLED(CONFIG_X86)) 1008 for (i = 3; i <= 15; i++) 1009 if (!tpm_tis_probe_irq_single(chip, intmask, 0, 1010 i)) 1011 return; 1012 } else if (!tpm_tis_probe_irq_single(chip, intmask, 0, 1013 original_int_vec)) 1014 return; 1015 } 1016 1017 void tpm_tis_remove(struct tpm_chip *chip) 1018 { 1019 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 1020 u32 reg = TPM_INT_ENABLE(priv->locality); 1021 u32 interrupt; 1022 int rc; 1023 1024 tpm_tis_clkrun_enable(chip, true); 1025 1026 rc = tpm_tis_read32(priv, reg, &interrupt); 1027 if (rc < 0) 1028 interrupt = 0; 1029 1030 tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt); 1031 if (priv->free_irq_work.func) 1032 flush_work(&priv->free_irq_work); 1033 1034 tpm_tis_clkrun_enable(chip, false); 1035 1036 if (priv->ilb_base_addr) 1037 iounmap(priv->ilb_base_addr); 1038 } 1039 EXPORT_SYMBOL_GPL(tpm_tis_remove); 1040 1041 /** 1042 * tpm_tis_clkrun_enable() - Keep clkrun protocol disabled for entire duration 1043 * of a single TPM command 1044 * @chip: TPM chip to use 1045 * @value: 1 - Disable CLKRUN protocol, so that clocks are free running 1046 * 0 - Enable CLKRUN protocol 1047 * Call this function directly in tpm_tis_remove() in error or driver removal 1048 * path, since the chip->ops is set to NULL in tpm_chip_unregister(). 1049 */ 1050 static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value) 1051 { 1052 struct tpm_tis_data *data = dev_get_drvdata(&chip->dev); 1053 u32 clkrun_val; 1054 1055 if (!IS_ENABLED(CONFIG_X86) || !is_bsw() || 1056 !data->ilb_base_addr) 1057 return; 1058 1059 if (value) { 1060 data->clkrun_enabled++; 1061 if (data->clkrun_enabled > 1) 1062 return; 1063 clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET); 1064 1065 /* Disable LPC CLKRUN# */ 1066 clkrun_val &= ~LPC_CLKRUN_EN; 1067 iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET); 1068 1069 } else { 1070 data->clkrun_enabled--; 1071 if (data->clkrun_enabled) 1072 return; 1073 1074 clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET); 1075 1076 /* Enable LPC CLKRUN# */ 1077 clkrun_val |= LPC_CLKRUN_EN; 1078 iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET); 1079 } 1080 1081 #ifdef CONFIG_HAS_IOPORT 1082 /* 1083 * Write any random value on port 0x80 which is on LPC, to make 1084 * sure LPC clock is running before sending any TPM command. 1085 */ 1086 outb(0xCC, 0x80); 1087 #endif 1088 } 1089 1090 static const struct tpm_class_ops tpm_tis = { 1091 .flags = TPM_OPS_AUTO_STARTUP, 1092 .status = tpm_tis_status, 1093 .recv = tpm_tis_recv, 1094 .send = tpm_tis_send, 1095 .cancel = tpm_tis_ready, 1096 .update_timeouts = tpm_tis_update_timeouts, 1097 .update_durations = tpm_tis_update_durations, 1098 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, 1099 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, 1100 .req_canceled = tpm_tis_req_canceled, 1101 .request_locality = tpm_tis_request_locality, 1102 .relinquish_locality = tpm_tis_relinquish_locality, 1103 .clk_enable = tpm_tis_clkrun_enable, 1104 }; 1105 1106 int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, 1107 const struct tpm_tis_phy_ops *phy_ops, 1108 acpi_handle acpi_dev_handle) 1109 { 1110 u32 vendor; 1111 u32 intfcaps; 1112 u32 intmask; 1113 u32 clkrun_val; 1114 u8 rid; 1115 int rc, probe; 1116 struct tpm_chip *chip; 1117 1118 chip = tpmm_chip_alloc(dev, &tpm_tis); 1119 if (IS_ERR(chip)) 1120 return PTR_ERR(chip); 1121 1122 #ifdef CONFIG_ACPI 1123 chip->acpi_dev_handle = acpi_dev_handle; 1124 #endif 1125 1126 chip->hwrng.quality = priv->rng_quality; 1127 1128 /* Maximum timeouts */ 1129 chip->timeout_a = msecs_to_jiffies(TIS_TIMEOUT_A_MAX); 1130 chip->timeout_b = msecs_to_jiffies(TIS_TIMEOUT_B_MAX); 1131 chip->timeout_c = msecs_to_jiffies(TIS_TIMEOUT_C_MAX); 1132 chip->timeout_d = msecs_to_jiffies(TIS_TIMEOUT_D_MAX); 1133 priv->chip = chip; 1134 priv->timeout_min = TPM_TIMEOUT_USECS_MIN; 1135 priv->timeout_max = TPM_TIMEOUT_USECS_MAX; 1136 priv->phy_ops = phy_ops; 1137 priv->locality_count = 0; 1138 mutex_init(&priv->locality_count_mutex); 1139 INIT_WORK(&priv->free_irq_work, tpm_tis_free_irq_func); 1140 1141 dev_set_drvdata(&chip->dev, priv); 1142 1143 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor); 1144 if (rc < 0) 1145 return rc; 1146 1147 priv->manufacturer_id = vendor; 1148 1149 if (priv->manufacturer_id == TPM_VID_ATML && 1150 !(chip->flags & TPM_CHIP_FLAG_TPM2)) { 1151 priv->timeout_min = TIS_TIMEOUT_MIN_ATML; 1152 priv->timeout_max = TIS_TIMEOUT_MAX_ATML; 1153 } 1154 1155 if (priv->manufacturer_id == TPM_VID_IFX) 1156 set_bit(TPM_TIS_STATUS_VALID_RETRY, &priv->flags); 1157 1158 if (is_bsw()) { 1159 priv->ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR, 1160 ILB_REMAP_SIZE); 1161 if (!priv->ilb_base_addr) 1162 return -ENOMEM; 1163 1164 clkrun_val = ioread32(priv->ilb_base_addr + LPC_CNTRL_OFFSET); 1165 /* Check if CLKRUN# is already not enabled in the LPC bus */ 1166 if (!(clkrun_val & LPC_CLKRUN_EN)) { 1167 iounmap(priv->ilb_base_addr); 1168 priv->ilb_base_addr = NULL; 1169 } 1170 } 1171 1172 if (chip->ops->clk_enable != NULL) 1173 chip->ops->clk_enable(chip, true); 1174 1175 if (wait_startup(chip, 0) != 0) { 1176 rc = -ENODEV; 1177 goto out_err; 1178 } 1179 1180 /* Take control of the TPM's interrupt hardware and shut it off */ 1181 rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask); 1182 if (rc < 0) 1183 goto out_err; 1184 1185 /* Figure out the capabilities */ 1186 rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps); 1187 if (rc < 0) 1188 goto out_err; 1189 1190 dev_dbg(dev, "TPM interface capabilities (0x%x):\n", 1191 intfcaps); 1192 if (intfcaps & TPM_INTF_BURST_COUNT_STATIC) 1193 dev_dbg(dev, "\tBurst Count Static\n"); 1194 if (intfcaps & TPM_INTF_CMD_READY_INT) { 1195 intmask |= TPM_INTF_CMD_READY_INT; 1196 dev_dbg(dev, "\tCommand Ready Int Support\n"); 1197 } 1198 if (intfcaps & TPM_INTF_INT_EDGE_FALLING) 1199 dev_dbg(dev, "\tInterrupt Edge Falling\n"); 1200 if (intfcaps & TPM_INTF_INT_EDGE_RISING) 1201 dev_dbg(dev, "\tInterrupt Edge Rising\n"); 1202 if (intfcaps & TPM_INTF_INT_LEVEL_LOW) 1203 dev_dbg(dev, "\tInterrupt Level Low\n"); 1204 if (intfcaps & TPM_INTF_INT_LEVEL_HIGH) 1205 dev_dbg(dev, "\tInterrupt Level High\n"); 1206 if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT) { 1207 intmask |= TPM_INTF_LOCALITY_CHANGE_INT; 1208 dev_dbg(dev, "\tLocality Change Int Support\n"); 1209 } 1210 if (intfcaps & TPM_INTF_STS_VALID_INT) { 1211 intmask |= TPM_INTF_STS_VALID_INT; 1212 dev_dbg(dev, "\tSts Valid Int Support\n"); 1213 } 1214 if (intfcaps & TPM_INTF_DATA_AVAIL_INT) { 1215 intmask |= TPM_INTF_DATA_AVAIL_INT; 1216 dev_dbg(dev, "\tData Avail Int Support\n"); 1217 } 1218 1219 intmask &= ~TPM_GLOBAL_INT_ENABLE; 1220 1221 rc = tpm_tis_request_locality(chip, 0); 1222 if (rc < 0) { 1223 rc = -ENODEV; 1224 goto out_err; 1225 } 1226 1227 tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); 1228 tpm_tis_relinquish_locality(chip, 0); 1229 1230 rc = tpm_chip_start(chip); 1231 if (rc) 1232 goto out_err; 1233 rc = tpm2_probe(chip); 1234 tpm_chip_stop(chip); 1235 if (rc) 1236 goto out_err; 1237 1238 rc = tpm_tis_read8(priv, TPM_RID(0), &rid); 1239 if (rc < 0) 1240 goto out_err; 1241 1242 dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n", 1243 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2", 1244 vendor >> 16, rid); 1245 1246 probe = probe_itpm(chip); 1247 if (probe < 0) { 1248 rc = -ENODEV; 1249 goto out_err; 1250 } 1251 1252 /* INTERRUPT Setup */ 1253 init_waitqueue_head(&priv->read_queue); 1254 init_waitqueue_head(&priv->int_queue); 1255 1256 rc = tpm_chip_bootstrap(chip); 1257 if (rc) 1258 goto out_err; 1259 1260 if (irq != -1) { 1261 /* 1262 * Before doing irq testing issue a command to the TPM in polling mode 1263 * to make sure it works. May as well use that command to set the 1264 * proper timeouts for the driver. 1265 */ 1266 1267 rc = tpm_tis_request_locality(chip, 0); 1268 if (rc < 0) 1269 goto out_err; 1270 1271 rc = tpm_get_timeouts(chip); 1272 1273 tpm_tis_relinquish_locality(chip, 0); 1274 1275 if (rc) { 1276 dev_err(dev, "Could not get TPM timeouts and durations\n"); 1277 rc = -ENODEV; 1278 goto out_err; 1279 } 1280 1281 if (irq) 1282 tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED, 1283 irq); 1284 else 1285 tpm_tis_probe_irq(chip, intmask); 1286 1287 if (chip->flags & TPM_CHIP_FLAG_IRQ) { 1288 priv->int_mask = intmask; 1289 } else { 1290 dev_err(&chip->dev, FW_BUG 1291 "TPM interrupt not working, polling instead\n"); 1292 1293 rc = tpm_tis_request_locality(chip, 0); 1294 if (rc < 0) 1295 goto out_err; 1296 tpm_tis_disable_interrupts(chip); 1297 tpm_tis_relinquish_locality(chip, 0); 1298 } 1299 } 1300 1301 rc = tpm_chip_register(chip); 1302 if (rc) 1303 goto out_err; 1304 1305 if (chip->ops->clk_enable != NULL) 1306 chip->ops->clk_enable(chip, false); 1307 1308 return 0; 1309 out_err: 1310 if (chip->ops->clk_enable != NULL) 1311 chip->ops->clk_enable(chip, false); 1312 1313 tpm_tis_remove(chip); 1314 1315 return rc; 1316 } 1317 EXPORT_SYMBOL_GPL(tpm_tis_core_init); 1318 1319 #ifdef CONFIG_PM_SLEEP 1320 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) 1321 { 1322 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); 1323 u32 intmask; 1324 int rc; 1325 1326 /* 1327 * Re-enable interrupts that device may have lost or BIOS/firmware may 1328 * have disabled. 1329 */ 1330 rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq); 1331 if (rc < 0) { 1332 dev_err(&chip->dev, "Setting IRQ failed.\n"); 1333 return; 1334 } 1335 1336 intmask = priv->int_mask | TPM_GLOBAL_INT_ENABLE; 1337 rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask); 1338 if (rc < 0) 1339 dev_err(&chip->dev, "Enabling interrupts failed.\n"); 1340 } 1341 1342 int tpm_tis_resume(struct device *dev) 1343 { 1344 struct tpm_chip *chip = dev_get_drvdata(dev); 1345 int ret; 1346 1347 ret = tpm_chip_start(chip); 1348 if (ret) 1349 return ret; 1350 1351 if (chip->flags & TPM_CHIP_FLAG_IRQ) 1352 tpm_tis_reenable_interrupts(chip); 1353 1354 /* 1355 * TPM 1.2 requires self-test on resume. This function actually returns 1356 * an error code but for unknown reason it isn't handled. 1357 */ 1358 if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) 1359 tpm1_do_selftest(chip); 1360 1361 tpm_chip_stop(chip); 1362 1363 ret = tpm_pm_resume(dev); 1364 if (ret) 1365 return ret; 1366 1367 return 0; 1368 } 1369 EXPORT_SYMBOL_GPL(tpm_tis_resume); 1370 #endif 1371 1372 MODULE_AUTHOR("Leendert van Doorn <leendert@watson.ibm.com>"); 1373 MODULE_DESCRIPTION("TPM Driver"); 1374 MODULE_VERSION("2.0"); 1375 MODULE_LICENSE("GPL"); 1376