drivers/char/tpm/tpm_tis_core.c

   1 /*
   2  * Copyright (C) 2005, 2006 IBM Corporation
   3  * Copyright (C) 2014, 2015 Intel Corporation
   4  *
   5  * Authors:
   6  * Leendert van Doorn <leendert@watson.ibm.com>
   7  * Kylene Hall <kjhall@us.ibm.com>
   8  *
   9  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  10  *
  11  * Device driver for TCG/TCPA TPM (trusted platform module).
  12  * Specifications at www.trustedcomputinggroup.org
  13  *
  14  * This device driver implements the TPM interface as defined in
  15  * the TCG TPM Interface Spec version 1.2, revision 1.0.
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License as
  19  * published by the Free Software Foundation, version 2 of the
  20  * License.
  21  */
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/pnp.h>
  26 #include <linux/slab.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/wait.h>
  29 #include <linux/acpi.h>
  30 #include <linux/freezer.h>
  31 #include "tpm.h"
  32 #include "tpm_tis_core.h"
  33
  34 /* Before we attempt to access the TPM we must see that the valid bit is set.
  35  * The specification says that this bit is 0 at reset and remains 0 until the
  36  * 'TPM has gone through its self test and initialization and has established
  37  * correct values in the other bits.'
  38  */
  39 static int wait_startup(struct tpm_chip *chip, int l)
  40 {
  41         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
  42         unsigned long stop = jiffies + chip->timeout_a;
  43
  44         do {
  45                 int rc;
  46                 u8 access;
  47
  48                 rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
  49                 if (rc < 0)
  50                         return rc;
  51
  52                 if (access & TPM_ACCESS_VALID)
  53                         return 0;
  54                 msleep(TPM_TIMEOUT);
  55         } while (time_before(jiffies, stop));
  56         return -1;
  57 }
  58
  59 static int check_locality(struct tpm_chip *chip, int l)
  60 {
  61         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
  62         int rc;
  63         u8 access;
  64
  65         rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
  66         if (rc < 0)
  67                 return rc;
  68
  69         if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
  70             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
  71                 return priv->locality = l;
  72
  73         return -1;
  74 }
  75
  76 static void release_locality(struct tpm_chip *chip, int l, int force)
  77 {
  78         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
  79         int rc;
  80         u8 access;
  81
  82         rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
  83         if (rc < 0)
  84                 return;
  85
  86         if (force || (access &
  87                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
  88             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
  89                 tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
  90
  91 }
  92
  93 static int request_locality(struct tpm_chip *chip, int l)
  94 {
  95         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
  96         unsigned long stop, timeout;
  97         long rc;
  98
  99         if (check_locality(chip, l) >= 0)
 100                 return l;
 101
 102         rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
 103         if (rc < 0)
 104                 return rc;
 105
 106         stop = jiffies + chip->timeout_a;
 107
 108         if (chip->flags & TPM_CHIP_FLAG_IRQ) {
 109 again:
 110                 timeout = stop - jiffies;
 111                 if ((long)timeout <= 0)
 112                         return -1;
 113                 rc = wait_event_interruptible_timeout(priv->int_queue,
 114                                                       (check_locality
 115                                                        (chip, l) >= 0),
 116                                                       timeout);
 117                 if (rc > 0)
 118                         return l;
 119                 if (rc == -ERESTARTSYS && freezing(current)) {
 120                         clear_thread_flag(TIF_SIGPENDING);
 121                         goto again;
 122                 }
 123         } else {
 124                 /* wait for burstcount */
 125                 do {
 126                         if (check_locality(chip, l) >= 0)
 127                                 return l;
 128                         msleep(TPM_TIMEOUT);
 129                 } while (time_before(jiffies, stop));
 130         }
 131         return -1;
 132 }
 133
 134 static u8 tpm_tis_status(struct tpm_chip *chip)
 135 {
 136         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 137         int rc;
 138         u8 status;
 139
 140         rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status);
 141         if (rc < 0)
 142                 return 0;
 143
 144         return status;
 145 }
 146
 147 static void tpm_tis_ready(struct tpm_chip *chip)
 148 {
 149         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 150
 151         /* this causes the current command to be aborted */
 152         tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY);
 153 }
 154
 155 static int get_burstcount(struct tpm_chip *chip)
 156 {
 157         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 158         unsigned long stop;
 159         int burstcnt, rc;
 160         u32 value;
 161
 162         /* wait for burstcount */
 163         /* which timeout value, spec has 2 answers (c & d) */
 164         stop = jiffies + chip->timeout_d;
 165         do {
 166                 rc = tpm_tis_read32(priv, TPM_STS(priv->locality), &value);
 167                 if (rc < 0)
 168                         return rc;
 169
 170                 burstcnt = (value >> 8) & 0xFFFF;
 171                 if (burstcnt)
 172                         return burstcnt;
 173                 msleep(TPM_TIMEOUT);
 174         } while (time_before(jiffies, stop));
 175         return -EBUSY;
 176 }
 177
 178 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 179 {
 180         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 181         int size = 0, burstcnt, rc;
 182
 183         while (size < count) {
 184                 rc = wait_for_tpm_stat(chip,
 185                                  TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 186                                  chip->timeout_c,
 187                                  &priv->read_queue, true);
 188                 if (rc < 0)
 189                         return rc;
 190                 burstcnt = get_burstcount(chip);
 191                 if (burstcnt < 0) {
 192                         dev_err(&chip->dev, "Unable to read burstcount\n");
 193                         return burstcnt;
 194                 }
 195                 burstcnt = min_t(int, burstcnt, count - size);
 196
 197                 rc = tpm_tis_read_bytes(priv, TPM_DATA_FIFO(priv->locality),
 198                                         burstcnt, buf + size);
 199                 if (rc < 0)
 200                         return rc;
 201
 202                 size += burstcnt;
 203         }
 204         return size;
 205 }
 206
 207 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 208 {
 209         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 210         int size = 0;
 211         int expected, status;
 212
 213         if (count < TPM_HEADER_SIZE) {
 214                 size = -EIO;
 215                 goto out;
 216         }
 217
 218         size = recv_data(chip, buf, TPM_HEADER_SIZE);
 219         /* read first 10 bytes, including tag, paramsize, and result */
 220         if (size < TPM_HEADER_SIZE) {
 221                 dev_err(&chip->dev, "Unable to read header\n");
 222                 goto out;
 223         }
 224
 225         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 226         if (expected > count) {
 227                 size = -EIO;
 228                 goto out;
 229         }
 230
 231         size += recv_data(chip, &buf[TPM_HEADER_SIZE],
 232                           expected - TPM_HEADER_SIZE);
 233         if (size < expected) {
 234                 dev_err(&chip->dev, "Unable to read remainder of result\n");
 235                 size = -ETIME;
 236                 goto out;
 237         }
 238
 239         if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
 240                                 &priv->int_queue, false) < 0) {
 241                 size = -ETIME;
 242                 goto out;
 243         }
 244         status = tpm_tis_status(chip);
 245         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 246                 dev_err(&chip->dev, "Error left over data\n");
 247                 size = -EIO;
 248                 goto out;
 249         }
 250
 251 out:
 252         tpm_tis_ready(chip);
 253         release_locality(chip, priv->locality, 0);
 254         return size;
 255 }
 256
 257 /*
 258  * If interrupts are used (signaled by an irq set in the vendor structure)
 259  * tpm.c can skip polling for the data to be available as the interrupt is
 260  * waited for here
 261  */
 262 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 263 {
 264         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 265         int rc, status, burstcnt;
 266         size_t count = 0;
 267         bool itpm = priv->flags & TPM_TIS_ITPM_POSSIBLE;
 268
 269         if (request_locality(chip, 0) < 0)
 270                 return -EBUSY;
 271
 272         status = tpm_tis_status(chip);
 273         if ((status & TPM_STS_COMMAND_READY) == 0) {
 274                 tpm_tis_ready(chip);
 275                 if (wait_for_tpm_stat
 276                     (chip, TPM_STS_COMMAND_READY, chip->timeout_b,
 277                      &priv->int_queue, false) < 0) {
 278                         rc = -ETIME;
 279                         goto out_err;
 280                 }
 281         }
 282
 283         while (count < len - 1) {
 284                 burstcnt = get_burstcount(chip);
 285                 if (burstcnt < 0) {
 286                         dev_err(&chip->dev, "Unable to read burstcount\n");
 287                         rc = burstcnt;
 288                         goto out_err;
 289                 }
 290                 burstcnt = min_t(int, burstcnt, len - count - 1);
 291                 rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality),
 292                                          burstcnt, buf + count);
 293                 if (rc < 0)
 294                         goto out_err;
 295
 296                 count += burstcnt;
 297
 298                 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
 299                                         &priv->int_queue, false) < 0) {
 300                         rc = -ETIME;
 301                         goto out_err;
 302                 }
 303                 status = tpm_tis_status(chip);
 304                 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
 305                         rc = -EIO;
 306                         goto out_err;
 307                 }
 308         }
 309
 310         /* write last byte */
 311         rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]);
 312         if (rc < 0)
 313                 goto out_err;
 314
 315         if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
 316                                 &priv->int_queue, false) < 0) {
 317                 rc = -ETIME;
 318                 goto out_err;
 319         }
 320         status = tpm_tis_status(chip);
 321         if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) {
 322                 rc = -EIO;
 323                 goto out_err;
 324         }
 325
 326         return 0;
 327
 328 out_err:
 329         tpm_tis_ready(chip);
 330         release_locality(chip, priv->locality, 0);
 331         return rc;
 332 }
 333
 334 static void disable_interrupts(struct tpm_chip *chip)
 335 {
 336         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 337         u32 intmask;
 338         int rc;
 339
 340         rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
 341         if (rc < 0)
 342                 intmask = 0;
 343
 344         intmask &= ~TPM_GLOBAL_INT_ENABLE;
 345         rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
 346
 347         devm_free_irq(chip->dev.parent, priv->irq, chip);
 348         priv->irq = 0;
 349         chip->flags &= ~TPM_CHIP_FLAG_IRQ;
 350 }
 351
 352 /*
 353  * If interrupts are used (signaled by an irq set in the vendor structure)
 354  * tpm.c can skip polling for the data to be available as the interrupt is
 355  * waited for here
 356  */
 357 static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
 358 {
 359         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 360         int rc;
 361         u32 ordinal;
 362         unsigned long dur;
 363
 364         rc = tpm_tis_send_data(chip, buf, len);
 365         if (rc < 0)
 366                 return rc;
 367
 368         /* go and do it */
 369         rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
 370         if (rc < 0)
 371                 goto out_err;
 372
 373         if (chip->flags & TPM_CHIP_FLAG_IRQ) {
 374                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 375
 376                 if (chip->flags & TPM_CHIP_FLAG_TPM2)
 377                         dur = tpm2_calc_ordinal_duration(chip, ordinal);
 378                 else
 379                         dur = tpm_calc_ordinal_duration(chip, ordinal);
 380
 381                 if (wait_for_tpm_stat
 382                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
 383                      &priv->read_queue, false) < 0) {
 384                         rc = -ETIME;
 385                         goto out_err;
 386                 }
 387         }
 388         return len;
 389 out_err:
 390         tpm_tis_ready(chip);
 391         release_locality(chip, priv->locality, 0);
 392         return rc;
 393 }
 394
 395 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 396 {
 397         int rc, irq;
 398         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 399
 400         if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested)
 401                 return tpm_tis_send_main(chip, buf, len);
 402
 403         /* Verify receipt of the expected IRQ */
 404         irq = priv->irq;
 405         priv->irq = 0;
 406         chip->flags &= ~TPM_CHIP_FLAG_IRQ;
 407         rc = tpm_tis_send_main(chip, buf, len);
 408         priv->irq = irq;
 409         chip->flags |= TPM_CHIP_FLAG_IRQ;
 410         if (!priv->irq_tested)
 411                 msleep(1);
 412         if (!priv->irq_tested)
 413                 disable_interrupts(chip);
 414         priv->irq_tested = true;
 415         return rc;
 416 }
 417
 418 struct tis_vendor_timeout_override {
 419         u32 did_vid;
 420         unsigned long timeout_us[4];
 421 };
 422
 423 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
 424         /* Atmel 3204 */
 425         { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
 426                         (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
 427 };
 428
 429 static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
 430                                     unsigned long *timeout_cap)
 431 {
 432         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 433         int i, rc;
 434         u32 did_vid;
 435
 436         rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
 437         if (rc < 0)
 438                 return rc;
 439
 440         for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
 441                 if (vendor_timeout_overrides[i].did_vid != did_vid)
 442                         continue;
 443                 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
 444                        sizeof(vendor_timeout_overrides[i].timeout_us));
 445                 return true;
 446         }
 447
 448         return false;
 449 }
 450
 451 /*
 452  * Early probing for iTPM with STS_DATA_EXPECT flaw.
 453  * Try sending command without itpm flag set and if that
 454  * fails, repeat with itpm flag set.
 455  */
 456 static int probe_itpm(struct tpm_chip *chip)
 457 {
 458         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 459         int rc = 0;
 460         u8 cmd_getticks[] = {
 461                 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
 462                 0x00, 0x00, 0x00, 0xf1
 463         };
 464         size_t len = sizeof(cmd_getticks);
 465         u16 vendor;
 466
 467         rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor);
 468         if (rc < 0)
 469                 return rc;
 470
 471         /* probe only iTPMS */
 472         if (vendor != TPM_VID_INTEL)
 473                 return 0;
 474
 475         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 476         if (rc == 0)
 477                 goto out;
 478
 479         tpm_tis_ready(chip);
 480         release_locality(chip, priv->locality, 0);
 481
 482         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 483         if (rc == 0) {
 484                 dev_info(&chip->dev, "Detected an iTPM.\n");
 485                 rc = 1;
 486         } else
 487                 rc = -EFAULT;
 488
 489 out:
 490         tpm_tis_ready(chip);
 491         release_locality(chip, priv->locality, 0);
 492
 493         return rc;
 494 }
 495
 496 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
 497 {
 498         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 499
 500         switch (priv->manufacturer_id) {
 501         case TPM_VID_WINBOND:
 502                 return ((status == TPM_STS_VALID) ||
 503                         (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
 504         case TPM_VID_STM:
 505                 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
 506         default:
 507                 return (status == TPM_STS_COMMAND_READY);
 508         }
 509 }
 510
 511 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 512 {
 513         struct tpm_chip *chip = dev_id;
 514         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 515         u32 interrupt;
 516         int i, rc;
 517
 518         rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
 519         if (rc < 0)
 520                 return IRQ_NONE;
 521
 522         if (interrupt == 0)
 523                 return IRQ_NONE;
 524
 525         priv->irq_tested = true;
 526         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 527                 wake_up_interruptible(&priv->read_queue);
 528         if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
 529                 for (i = 0; i < 5; i++)
 530                         if (check_locality(chip, i) >= 0)
 531                                 break;
 532         if (interrupt &
 533             (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
 534              TPM_INTF_CMD_READY_INT))
 535                 wake_up_interruptible(&priv->int_queue);
 536
 537         /* Clear interrupts handled with TPM_EOI */
 538         rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt);
 539         if (rc < 0)
 540                 return IRQ_NONE;
 541
 542         tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
 543         return IRQ_HANDLED;
 544 }
 545
 546 static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
 547 {
 548         const char *desc = "attempting to generate an interrupt";
 549         u32 cap2;
 550         cap_t cap;
 551
 552         if (chip->flags & TPM_CHIP_FLAG_TPM2)
 553                 return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
 554         else
 555                 return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc);
 556 }
 557
 558 /* Register the IRQ and issue a command that will cause an interrupt. If an
 559  * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
 560  * everything and leave in polling mode. Returns 0 on success.
 561  */
 562 static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
 563                                     int flags, int irq)
 564 {
 565         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 566         u8 original_int_vec;
 567         int rc;
 568         u32 int_status;
 569
 570         if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
 571                              dev_name(&chip->dev), chip) != 0) {
 572                 dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
 573                          irq);
 574                 return -1;
 575         }
 576         priv->irq = irq;
 577
 578         rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
 579                            &original_int_vec);
 580         if (rc < 0)
 581                 return rc;
 582
 583         rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq);
 584         if (rc < 0)
 585                 return rc;
 586
 587         rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status);
 588         if (rc < 0)
 589                 return rc;
 590
 591         /* Clear all existing */
 592         rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status);
 593         if (rc < 0)
 594                 return rc;
 595
 596         /* Turn on */
 597         rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality),
 598                              intmask | TPM_GLOBAL_INT_ENABLE);
 599         if (rc < 0)
 600                 return rc;
 601
 602         priv->irq_tested = false;
 603
 604         /* Generate an interrupt by having the core call through to
 605          * tpm_tis_send
 606          */
 607         rc = tpm_tis_gen_interrupt(chip);
 608         if (rc < 0)
 609                 return rc;
 610
 611         /* tpm_tis_send will either confirm the interrupt is working or it
 612          * will call disable_irq which undoes all of the above.
 613          */
 614         if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
 615                 rc = tpm_tis_write8(priv, original_int_vec,
 616                                 TPM_INT_VECTOR(priv->locality));
 617                 if (rc < 0)
 618                         return rc;
 619
 620                 return 1;
 621         }
 622
 623         return 0;
 624 }
 625
 626 /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
 627  * do not have ACPI/etc. We typically expect the interrupt to be declared if
 628  * present.
 629  */
 630 static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
 631 {
 632         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 633         u8 original_int_vec;
 634         int i, rc;
 635
 636         rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
 637                            &original_int_vec);
 638         if (rc < 0)
 639                 return;
 640
 641         if (!original_int_vec) {
 642                 if (IS_ENABLED(CONFIG_X86))
 643                         for (i = 3; i <= 15; i++)
 644                                 if (!tpm_tis_probe_irq_single(chip, intmask, 0,
 645                                                               i))
 646                                         return;
 647         } else if (!tpm_tis_probe_irq_single(chip, intmask, 0,
 648                                              original_int_vec))
 649                 return;
 650 }
 651
 652 void tpm_tis_remove(struct tpm_chip *chip)
 653 {
 654         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 655         u32 reg = TPM_INT_ENABLE(priv->locality);
 656         u32 interrupt;
 657         int rc;
 658
 659         rc = tpm_tis_read32(priv, reg, &interrupt);
 660         if (rc < 0)
 661                 interrupt = 0;
 662
 663         tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
 664         release_locality(chip, priv->locality, 1);
 665 }
 666 EXPORT_SYMBOL_GPL(tpm_tis_remove);
 667
 668 static const struct tpm_class_ops tpm_tis = {
 669         .flags = TPM_OPS_AUTO_STARTUP,
 670         .status = tpm_tis_status,
 671         .recv = tpm_tis_recv,
 672         .send = tpm_tis_send,
 673         .cancel = tpm_tis_ready,
 674         .update_timeouts = tpm_tis_update_timeouts,
 675         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 676         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 677         .req_canceled = tpm_tis_req_canceled,
 678 };
 679
 680 int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 681                       const struct tpm_tis_phy_ops *phy_ops,
 682                       acpi_handle acpi_dev_handle)
 683 {
 684         u32 vendor, intfcaps, intmask;
 685         u8 rid;
 686         int rc, probe;
 687         struct tpm_chip *chip;
 688
 689         chip = tpmm_chip_alloc(dev, &tpm_tis);
 690         if (IS_ERR(chip))
 691                 return PTR_ERR(chip);
 692
 693 #ifdef CONFIG_ACPI
 694         chip->acpi_dev_handle = acpi_dev_handle;
 695 #endif
 696
 697         /* Maximum timeouts */
 698         chip->timeout_a = msecs_to_jiffies(TIS_TIMEOUT_A_MAX);
 699         chip->timeout_b = msecs_to_jiffies(TIS_TIMEOUT_B_MAX);
 700         chip->timeout_c = msecs_to_jiffies(TIS_TIMEOUT_C_MAX);
 701         chip->timeout_d = msecs_to_jiffies(TIS_TIMEOUT_D_MAX);
 702         priv->phy_ops = phy_ops;
 703         dev_set_drvdata(&chip->dev, priv);
 704
 705         if (wait_startup(chip, 0) != 0) {
 706                 rc = -ENODEV;
 707                 goto out_err;
 708         }
 709
 710         /* Take control of the TPM's interrupt hardware and shut it off */
 711         rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
 712         if (rc < 0)
 713                 goto out_err;
 714
 715         intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
 716                    TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
 717         intmask &= ~TPM_GLOBAL_INT_ENABLE;
 718         tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
 719
 720         if (request_locality(chip, 0) != 0) {
 721                 rc = -ENODEV;
 722                 goto out_err;
 723         }
 724
 725         rc = tpm2_probe(chip);
 726         if (rc)
 727                 goto out_err;
 728
 729         rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
 730         if (rc < 0)
 731                 goto out_err;
 732
 733         priv->manufacturer_id = vendor;
 734
 735         rc = tpm_tis_read8(priv, TPM_RID(0), &rid);
 736         if (rc < 0)
 737                 goto out_err;
 738
 739         dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
 740                  (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
 741                  vendor >> 16, rid);
 742
 743         if (!(priv->flags & TPM_TIS_ITPM_POSSIBLE)) {
 744                 probe = probe_itpm(chip);
 745                 if (probe < 0) {
 746                         rc = -ENODEV;
 747                         goto out_err;
 748                 }
 749
 750                 if (!!probe)
 751                         priv->flags |= TPM_TIS_ITPM_POSSIBLE;
 752         }
 753
 754         /* Figure out the capabilities */
 755         rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps);
 756         if (rc < 0)
 757                 goto out_err;
 758
 759         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 760                 intfcaps);
 761         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 762                 dev_dbg(dev, "\tBurst Count Static\n");
 763         if (intfcaps & TPM_INTF_CMD_READY_INT)
 764                 dev_dbg(dev, "\tCommand Ready Int Support\n");
 765         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 766                 dev_dbg(dev, "\tInterrupt Edge Falling\n");
 767         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 768                 dev_dbg(dev, "\tInterrupt Edge Rising\n");
 769         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 770                 dev_dbg(dev, "\tInterrupt Level Low\n");
 771         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 772                 dev_dbg(dev, "\tInterrupt Level High\n");
 773         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 774                 dev_dbg(dev, "\tLocality Change Int Support\n");
 775         if (intfcaps & TPM_INTF_STS_VALID_INT)
 776                 dev_dbg(dev, "\tSts Valid Int Support\n");
 777         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 778                 dev_dbg(dev, "\tData Avail Int Support\n");
 779
 780         /* INTERRUPT Setup */
 781         init_waitqueue_head(&priv->read_queue);
 782         init_waitqueue_head(&priv->int_queue);
 783         if (irq != -1) {
 784                 /* Before doing irq testing issue a command to the TPM in polling mode
 785                  * to make sure it works. May as well use that command to set the
 786                  * proper timeouts for the driver.
 787                  */
 788                 if (tpm_get_timeouts(chip)) {
 789                         dev_err(dev, "Could not get TPM timeouts and durations\n");
 790                         rc = -ENODEV;
 791                         goto out_err;
 792                 }
 793
 794                 if (irq) {
 795                         tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
 796                                                  irq);
 797                         if (!(chip->flags & TPM_CHIP_FLAG_IRQ))
 798                                 dev_err(&chip->dev, FW_BUG
 799                                         "TPM interrupt not working, polling instead\n");
 800                 } else {
 801                         tpm_tis_probe_irq(chip, intmask);
 802                 }
 803         }
 804
 805         return tpm_chip_register(chip);
 806 out_err:
 807         tpm_tis_remove(chip);
 808         return rc;
 809 }
 810 EXPORT_SYMBOL_GPL(tpm_tis_core_init);
 811
 812 #ifdef CONFIG_PM_SLEEP
 813 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
 814 {
 815         struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
 816         u32 intmask;
 817         int rc;
 818
 819         /* reenable interrupts that device may have lost or
 820          * BIOS/firmware may have disabled
 821          */
 822         rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
 823         if (rc < 0)
 824                 return;
 825
 826         rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
 827         if (rc < 0)
 828                 return;
 829
 830         intmask |= TPM_INTF_CMD_READY_INT
 831             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 832             | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
 833
 834         tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
 835 }
 836
 837 int tpm_tis_resume(struct device *dev)
 838 {
 839         struct tpm_chip *chip = dev_get_drvdata(dev);
 840         int ret;
 841
 842         if (chip->flags & TPM_CHIP_FLAG_IRQ)
 843                 tpm_tis_reenable_interrupts(chip);
 844
 845         ret = tpm_pm_resume(dev);
 846         if (ret)
 847                 return ret;
 848
 849         /* TPM 1.2 requires self-test on resume. This function actually returns
 850          * an error code but for unknown reason it isn't handled.
 851          */
 852         if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
 853                 tpm_do_selftest(chip);
 854
 855         return 0;
 856 }
 857 EXPORT_SYMBOL_GPL(tpm_tis_resume);
 858 #endif
 859
 860 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 861 MODULE_DESCRIPTION("TPM Driver");
 862 MODULE_VERSION("2.0");
 863 MODULE_LICENSE("GPL");