drivers/char/tpm/tpm_tis.c

   1 /*
   2  * Copyright (C) 2005, 2006 IBM Corporation
   3  *
   4  * Authors:
   5  * Leendert van Doorn <leendert@watson.ibm.com>
   6  * Kylene Hall <kjhall@us.ibm.com>
   7  *
   8  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
   9  *
  10  * Device driver for TCG/TCPA TPM (trusted platform module).
  11  * Specifications at www.trustedcomputinggroup.org
  12  *
  13  * This device driver implements the TPM interface as defined in
  14  * the TCG TPM Interface Spec version 1.2, revision 1.0.
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License as
  18  * published by the Free Software Foundation, version 2 of the
  19  * License.
  20  */
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/pnp.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/wait.h>
  28 #include <linux/acpi.h>
  29 #include <linux/freezer.h>
  30 #include "tpm.h"
  31
  32 #define TPM_HEADER_SIZE 10
  33
  34 enum tis_access {
  35         TPM_ACCESS_VALID = 0x80,
  36         TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
  37         TPM_ACCESS_REQUEST_PENDING = 0x04,
  38         TPM_ACCESS_REQUEST_USE = 0x02,
  39 };
  40
  41 enum tis_status {
  42         TPM_STS_VALID = 0x80,
  43         TPM_STS_COMMAND_READY = 0x40,
  44         TPM_STS_GO = 0x20,
  45         TPM_STS_DATA_AVAIL = 0x10,
  46         TPM_STS_DATA_EXPECT = 0x08,
  47 };
  48
  49 enum tis_int_flags {
  50         TPM_GLOBAL_INT_ENABLE = 0x80000000,
  51         TPM_INTF_BURST_COUNT_STATIC = 0x100,
  52         TPM_INTF_CMD_READY_INT = 0x080,
  53         TPM_INTF_INT_EDGE_FALLING = 0x040,
  54         TPM_INTF_INT_EDGE_RISING = 0x020,
  55         TPM_INTF_INT_LEVEL_LOW = 0x010,
  56         TPM_INTF_INT_LEVEL_HIGH = 0x008,
  57         TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
  58         TPM_INTF_STS_VALID_INT = 0x002,
  59         TPM_INTF_DATA_AVAIL_INT = 0x001,
  60 };
  61
  62 enum tis_defaults {
  63         TIS_MEM_BASE = 0xFED40000,
  64         TIS_MEM_LEN = 0x5000,
  65         TIS_SHORT_TIMEOUT = 750,        /* ms */
  66         TIS_LONG_TIMEOUT = 2000,        /* 2 sec */
  67 };
  68
  69 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 12))
  70 #define TPM_INT_ENABLE(l)               (0x0008 | ((l) << 12))
  71 #define TPM_INT_VECTOR(l)               (0x000C | ((l) << 12))
  72 #define TPM_INT_STATUS(l)               (0x0010 | ((l) << 12))
  73 #define TPM_INTF_CAPS(l)                (0x0014 | ((l) << 12))
  74 #define TPM_STS(l)                      (0x0018 | ((l) << 12))
  75 #define TPM_DATA_FIFO(l)                (0x0024 | ((l) << 12))
  76
  77 #define TPM_DID_VID(l)                  (0x0F00 | ((l) << 12))
  78 #define TPM_RID(l)                      (0x0F04 | ((l) << 12))
  79
  80 static LIST_HEAD(tis_chips);
  81 static DEFINE_SPINLOCK(tis_lock);
  82
  83 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
  84 static int is_itpm(struct pnp_dev *dev)
  85 {
  86         struct acpi_device *acpi = pnp_acpi_device(dev);
  87         struct acpi_hardware_id *id;
  88
  89         list_for_each_entry(id, &acpi->pnp.ids, list) {
  90                 if (!strcmp("INTC0102", id->id))
  91                         return 1;
  92         }
  93
  94         return 0;
  95 }
  96 #else
  97 static inline int is_itpm(struct pnp_dev *dev)
  98 {
  99         return 0;
 100 }
 101 #endif
 102
 103 static int check_locality(struct tpm_chip *chip, int l)
 104 {
 105         if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 106              (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 107             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
 108                 return chip->vendor.locality = l;
 109
 110         return -1;
 111 }
 112
 113 static void release_locality(struct tpm_chip *chip, int l, int force)
 114 {
 115         if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 116                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
 117             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
 118                 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
 119                          chip->vendor.iobase + TPM_ACCESS(l));
 120 }
 121
 122 static int request_locality(struct tpm_chip *chip, int l)
 123 {
 124         unsigned long stop, timeout;
 125         long rc;
 126
 127         if (check_locality(chip, l) >= 0)
 128                 return l;
 129
 130         iowrite8(TPM_ACCESS_REQUEST_USE,
 131                  chip->vendor.iobase + TPM_ACCESS(l));
 132
 133         stop = jiffies + chip->vendor.timeout_a;
 134
 135         if (chip->vendor.irq) {
 136 again:
 137                 timeout = stop - jiffies;
 138                 if ((long)timeout <= 0)
 139                         return -1;
 140                 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 141                                                       (check_locality
 142                                                        (chip, l) >= 0),
 143                                                       timeout);
 144                 if (rc > 0)
 145                         return l;
 146                 if (rc == -ERESTARTSYS && freezing(current)) {
 147                         clear_thread_flag(TIF_SIGPENDING);
 148                         goto again;
 149                 }
 150         } else {
 151                 /* wait for burstcount */
 152                 do {
 153                         if (check_locality(chip, l) >= 0)
 154                                 return l;
 155                         msleep(TPM_TIMEOUT);
 156                 }
 157                 while (time_before(jiffies, stop));
 158         }
 159         return -1;
 160 }
 161
 162 static u8 tpm_tis_status(struct tpm_chip *chip)
 163 {
 164         return ioread8(chip->vendor.iobase +
 165                        TPM_STS(chip->vendor.locality));
 166 }
 167
 168 static void tpm_tis_ready(struct tpm_chip *chip)
 169 {
 170         /* this causes the current command to be aborted */
 171         iowrite8(TPM_STS_COMMAND_READY,
 172                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 173 }
 174
 175 static int get_burstcount(struct tpm_chip *chip)
 176 {
 177         unsigned long stop;
 178         int burstcnt;
 179
 180         /* wait for burstcount */
 181         /* which timeout value, spec has 2 answers (c & d) */
 182         stop = jiffies + chip->vendor.timeout_d;
 183         do {
 184                 burstcnt = ioread8(chip->vendor.iobase +
 185                                    TPM_STS(chip->vendor.locality) + 1);
 186                 burstcnt += ioread8(chip->vendor.iobase +
 187                                     TPM_STS(chip->vendor.locality) +
 188                                     2) << 8;
 189                 if (burstcnt)
 190                         return burstcnt;
 191                 msleep(TPM_TIMEOUT);
 192         } while (time_before(jiffies, stop));
 193         return -EBUSY;
 194 }
 195
 196 static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 197                          wait_queue_head_t *queue)
 198 {
 199         unsigned long stop;
 200         long rc;
 201         u8 status;
 202
 203         /* check current status */
 204         status = tpm_tis_status(chip);
 205         if ((status & mask) == mask)
 206                 return 0;
 207
 208         stop = jiffies + timeout;
 209
 210         if (chip->vendor.irq) {
 211 again:
 212                 timeout = stop - jiffies;
 213                 if ((long)timeout <= 0)
 214                         return -ETIME;
 215                 rc = wait_event_interruptible_timeout(*queue,
 216                                                       ((tpm_tis_status
 217                                                         (chip) & mask) ==
 218                                                        mask), timeout);
 219                 if (rc > 0)
 220                         return 0;
 221                 if (rc == -ERESTARTSYS && freezing(current)) {
 222                         clear_thread_flag(TIF_SIGPENDING);
 223                         goto again;
 224                 }
 225         } else {
 226                 do {
 227                         msleep(TPM_TIMEOUT);
 228                         status = tpm_tis_status(chip);
 229                         if ((status & mask) == mask)
 230                                 return 0;
 231                 } while (time_before(jiffies, stop));
 232         }
 233         return -ETIME;
 234 }
 235
 236 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 237 {
 238         int size = 0, burstcnt;
 239         while (size < count &&
 240                wait_for_stat(chip,
 241                              TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 242                              chip->vendor.timeout_c,
 243                              &chip->vendor.read_queue)
 244                == 0) {
 245                 burstcnt = get_burstcount(chip);
 246                 for (; burstcnt > 0 && size < count; burstcnt--)
 247                         buf[size++] = ioread8(chip->vendor.iobase +
 248                                               TPM_DATA_FIFO(chip->vendor.
 249                                                             locality));
 250         }
 251         return size;
 252 }
 253
 254 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 255 {
 256         int size = 0;
 257         int expected, status;
 258
 259         if (count < TPM_HEADER_SIZE) {
 260                 size = -EIO;
 261                 goto out;
 262         }
 263
 264         /* read first 10 bytes, including tag, paramsize, and result */
 265         if ((size =
 266              recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
 267                 dev_err(chip->dev, "Unable to read header\n");
 268                 goto out;
 269         }
 270
 271         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 272         if (expected > count) {
 273                 size = -EIO;
 274                 goto out;
 275         }
 276
 277         if ((size +=
 278              recv_data(chip, &buf[TPM_HEADER_SIZE],
 279                        expected - TPM_HEADER_SIZE)) < expected) {
 280                 dev_err(chip->dev, "Unable to read remainder of result\n");
 281                 size = -ETIME;
 282                 goto out;
 283         }
 284
 285         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 286                       &chip->vendor.int_queue);
 287         status = tpm_tis_status(chip);
 288         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 289                 dev_err(chip->dev, "Error left over data\n");
 290                 size = -EIO;
 291                 goto out;
 292         }
 293
 294 out:
 295         tpm_tis_ready(chip);
 296         release_locality(chip, chip->vendor.locality, 0);
 297         return size;
 298 }
 299
 300 static int itpm;
 301 module_param(itpm, bool, 0444);
 302 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
 303
 304 /*
 305  * If interrupts are used (signaled by an irq set in the vendor structure)
 306  * tpm.c can skip polling for the data to be available as the interrupt is
 307  * waited for here
 308  */
 309 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 310 {
 311         int rc, status, burstcnt;
 312         size_t count = 0;
 313
 314         if (request_locality(chip, 0) < 0)
 315                 return -EBUSY;
 316
 317         status = tpm_tis_status(chip);
 318         if ((status & TPM_STS_COMMAND_READY) == 0) {
 319                 tpm_tis_ready(chip);
 320                 if (wait_for_stat
 321                     (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 322                      &chip->vendor.int_queue) < 0) {
 323                         rc = -ETIME;
 324                         goto out_err;
 325                 }
 326         }
 327
 328         while (count < len - 1) {
 329                 burstcnt = get_burstcount(chip);
 330                 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
 331                         iowrite8(buf[count], chip->vendor.iobase +
 332                                  TPM_DATA_FIFO(chip->vendor.locality));
 333                         count++;
 334                 }
 335
 336                 wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 337                               &chip->vendor.int_queue);
 338                 status = tpm_tis_status(chip);
 339                 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
 340                         rc = -EIO;
 341                         goto out_err;
 342                 }
 343         }
 344
 345         /* write last byte */
 346         iowrite8(buf[count],
 347                  chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
 348         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 349                       &chip->vendor.int_queue);
 350         status = tpm_tis_status(chip);
 351         if ((status & TPM_STS_DATA_EXPECT) != 0) {
 352                 rc = -EIO;
 353                 goto out_err;
 354         }
 355
 356         return 0;
 357
 358 out_err:
 359         tpm_tis_ready(chip);
 360         release_locality(chip, chip->vendor.locality, 0);
 361         return rc;
 362 }
 363
 364 /*
 365  * If interrupts are used (signaled by an irq set in the vendor structure)
 366  * tpm.c can skip polling for the data to be available as the interrupt is
 367  * waited for here
 368  */
 369 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 370 {
 371         int rc;
 372         u32 ordinal;
 373
 374         rc = tpm_tis_send_data(chip, buf, len);
 375         if (rc < 0)
 376                 return rc;
 377
 378         /* go and do it */
 379         iowrite8(TPM_STS_GO,
 380                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 381
 382         if (chip->vendor.irq) {
 383                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 384                 if (wait_for_stat
 385                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 386                      tpm_calc_ordinal_duration(chip, ordinal),
 387                      &chip->vendor.read_queue) < 0) {
 388                         rc = -ETIME;
 389                         goto out_err;
 390                 }
 391         }
 392         return len;
 393 out_err:
 394         tpm_tis_ready(chip);
 395         release_locality(chip, chip->vendor.locality, 0);
 396         return rc;
 397 }
 398
 399 /*
 400  * Early probing for iTPM with STS_DATA_EXPECT flaw.
 401  * Try sending command without itpm flag set and if that
 402  * fails, repeat with itpm flag set.
 403  */
 404 static int probe_itpm(struct tpm_chip *chip)
 405 {
 406         int rc = 0;
 407         u8 cmd_getticks[] = {
 408                 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
 409                 0x00, 0x00, 0x00, 0xf1
 410         };
 411         size_t len = sizeof(cmd_getticks);
 412         int rem_itpm = itpm;
 413
 414         itpm = 0;
 415
 416         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 417         if (rc == 0)
 418                 goto out;
 419
 420         tpm_tis_ready(chip);
 421         release_locality(chip, chip->vendor.locality, 0);
 422
 423         itpm = 1;
 424
 425         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 426         if (rc == 0) {
 427                 dev_info(chip->dev, "Detected an iTPM.\n");
 428                 rc = 1;
 429         } else
 430                 rc = -EFAULT;
 431
 432 out:
 433         itpm = rem_itpm;
 434         tpm_tis_ready(chip);
 435         /* some TPMs need a break here otherwise they will not work
 436          * correctly on the immediately subsequent command */
 437         msleep(chip->vendor.timeout_b);
 438         release_locality(chip, chip->vendor.locality, 0);
 439
 440         return rc;
 441 }
 442
 443 static const struct file_operations tis_ops = {
 444         .owner = THIS_MODULE,
 445         .llseek = no_llseek,
 446         .open = tpm_open,
 447         .read = tpm_read,
 448         .write = tpm_write,
 449         .release = tpm_release,
 450 };
 451
 452 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 453 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 454 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 455 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 456 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 457 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 458                    NULL);
 459 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 460 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 461 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
 462 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 463
 464 static struct attribute *tis_attrs[] = {
 465         &dev_attr_pubek.attr,
 466         &dev_attr_pcrs.attr,
 467         &dev_attr_enabled.attr,
 468         &dev_attr_active.attr,
 469         &dev_attr_owned.attr,
 470         &dev_attr_temp_deactivated.attr,
 471         &dev_attr_caps.attr,
 472         &dev_attr_cancel.attr,
 473         &dev_attr_durations.attr,
 474         &dev_attr_timeouts.attr, NULL,
 475 };
 476
 477 static struct attribute_group tis_attr_grp = {
 478         .attrs = tis_attrs
 479 };
 480
 481 static struct tpm_vendor_specific tpm_tis = {
 482         .status = tpm_tis_status,
 483         .recv = tpm_tis_recv,
 484         .send = tpm_tis_send,
 485         .cancel = tpm_tis_ready,
 486         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 487         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 488         .req_canceled = TPM_STS_COMMAND_READY,
 489         .attr_group = &tis_attr_grp,
 490         .miscdev = {
 491                     .fops = &tis_ops,},
 492 };
 493
 494 static irqreturn_t tis_int_probe(int irq, void *dev_id)
 495 {
 496         struct tpm_chip *chip = dev_id;
 497         u32 interrupt;
 498
 499         interrupt = ioread32(chip->vendor.iobase +
 500                              TPM_INT_STATUS(chip->vendor.locality));
 501
 502         if (interrupt == 0)
 503                 return IRQ_NONE;
 504
 505         chip->vendor.probed_irq = irq;
 506
 507         /* Clear interrupts handled with TPM_EOI */
 508         iowrite32(interrupt,
 509                   chip->vendor.iobase +
 510                   TPM_INT_STATUS(chip->vendor.locality));
 511         return IRQ_HANDLED;
 512 }
 513
 514 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 515 {
 516         struct tpm_chip *chip = dev_id;
 517         u32 interrupt;
 518         int i;
 519
 520         interrupt = ioread32(chip->vendor.iobase +
 521                              TPM_INT_STATUS(chip->vendor.locality));
 522
 523         if (interrupt == 0)
 524                 return IRQ_NONE;
 525
 526         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 527                 wake_up_interruptible(&chip->vendor.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(&chip->vendor.int_queue);
 536
 537         /* Clear interrupts handled with TPM_EOI */
 538         iowrite32(interrupt,
 539                   chip->vendor.iobase +
 540                   TPM_INT_STATUS(chip->vendor.locality));
 541         ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
 542         return IRQ_HANDLED;
 543 }
 544
 545 static int interrupts = 1;
 546 module_param(interrupts, bool, 0444);
 547 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 548
 549 static int tpm_tis_init(struct device *dev, resource_size_t start,
 550                         resource_size_t len, unsigned int irq)
 551 {
 552         u32 vendor, intfcaps, intmask;
 553         int rc, i, irq_s, irq_e;
 554         struct tpm_chip *chip;
 555
 556         if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
 557                 return -ENODEV;
 558
 559         chip->vendor.iobase = ioremap(start, len);
 560         if (!chip->vendor.iobase) {
 561                 rc = -EIO;
 562                 goto out_err;
 563         }
 564
 565         /* Default timeouts */
 566         chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 567         chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 568         chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 569         chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 570
 571         if (request_locality(chip, 0) != 0) {
 572                 rc = -ENODEV;
 573                 goto out_err;
 574         }
 575
 576         vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 577
 578         dev_info(dev,
 579                  "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 580                  vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 581
 582         if (!itpm) {
 583                 itpm = probe_itpm(chip);
 584                 if (itpm < 0) {
 585                         rc = -ENODEV;
 586                         goto out_err;
 587                 }
 588         }
 589
 590         if (itpm)
 591                 dev_info(dev, "Intel iTPM workaround enabled\n");
 592
 593
 594         /* Figure out the capabilities */
 595         intfcaps =
 596             ioread32(chip->vendor.iobase +
 597                      TPM_INTF_CAPS(chip->vendor.locality));
 598         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 599                 intfcaps);
 600         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 601                 dev_dbg(dev, "\tBurst Count Static\n");
 602         if (intfcaps & TPM_INTF_CMD_READY_INT)
 603                 dev_dbg(dev, "\tCommand Ready Int Support\n");
 604         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 605                 dev_dbg(dev, "\tInterrupt Edge Falling\n");
 606         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 607                 dev_dbg(dev, "\tInterrupt Edge Rising\n");
 608         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 609                 dev_dbg(dev, "\tInterrupt Level Low\n");
 610         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 611                 dev_dbg(dev, "\tInterrupt Level High\n");
 612         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 613                 dev_dbg(dev, "\tLocality Change Int Support\n");
 614         if (intfcaps & TPM_INTF_STS_VALID_INT)
 615                 dev_dbg(dev, "\tSts Valid Int Support\n");
 616         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 617                 dev_dbg(dev, "\tData Avail Int Support\n");
 618
 619         /* get the timeouts before testing for irqs */
 620         tpm_get_timeouts(chip);
 621
 622         /* INTERRUPT Setup */
 623         init_waitqueue_head(&chip->vendor.read_queue);
 624         init_waitqueue_head(&chip->vendor.int_queue);
 625
 626         intmask =
 627             ioread32(chip->vendor.iobase +
 628                      TPM_INT_ENABLE(chip->vendor.locality));
 629
 630         intmask |= TPM_INTF_CMD_READY_INT
 631             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 632             | TPM_INTF_STS_VALID_INT;
 633
 634         iowrite32(intmask,
 635                   chip->vendor.iobase +
 636                   TPM_INT_ENABLE(chip->vendor.locality));
 637         if (interrupts)
 638                 chip->vendor.irq = irq;
 639         if (interrupts && !chip->vendor.irq) {
 640                 irq_s =
 641                     ioread8(chip->vendor.iobase +
 642                             TPM_INT_VECTOR(chip->vendor.locality));
 643                 if (irq_s) {
 644                         irq_e = irq_s;
 645                 } else {
 646                         irq_s = 3;
 647                         irq_e = 15;
 648                 }
 649
 650                 for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
 651                         iowrite8(i, chip->vendor.iobase +
 652                                  TPM_INT_VECTOR(chip->vendor.locality));
 653                         if (request_irq
 654                             (i, tis_int_probe, IRQF_SHARED,
 655                              chip->vendor.miscdev.name, chip) != 0) {
 656                                 dev_info(chip->dev,
 657                                          "Unable to request irq: %d for probe\n",
 658                                          i);
 659                                 continue;
 660                         }
 661
 662                         /* Clear all existing */
 663                         iowrite32(ioread32
 664                                   (chip->vendor.iobase +
 665                                    TPM_INT_STATUS(chip->vendor.locality)),
 666                                   chip->vendor.iobase +
 667                                   TPM_INT_STATUS(chip->vendor.locality));
 668
 669                         /* Turn on */
 670                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 671                                   chip->vendor.iobase +
 672                                   TPM_INT_ENABLE(chip->vendor.locality));
 673
 674                         chip->vendor.probed_irq = 0;
 675
 676                         /* Generate Interrupts */
 677                         tpm_gen_interrupt(chip);
 678
 679                         chip->vendor.irq = chip->vendor.probed_irq;
 680
 681                         /* free_irq will call into tis_int_probe;
 682                            clear all irqs we haven't seen while doing
 683                            tpm_gen_interrupt */
 684                         iowrite32(ioread32
 685                                   (chip->vendor.iobase +
 686                                    TPM_INT_STATUS(chip->vendor.locality)),
 687                                   chip->vendor.iobase +
 688                                   TPM_INT_STATUS(chip->vendor.locality));
 689
 690                         /* Turn off */
 691                         iowrite32(intmask,
 692                                   chip->vendor.iobase +
 693                                   TPM_INT_ENABLE(chip->vendor.locality));
 694                         free_irq(i, chip);
 695                 }
 696         }
 697         if (chip->vendor.irq) {
 698                 iowrite8(chip->vendor.irq,
 699                          chip->vendor.iobase +
 700                          TPM_INT_VECTOR(chip->vendor.locality));
 701                 if (request_irq
 702                     (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
 703                      chip->vendor.miscdev.name, chip) != 0) {
 704                         dev_info(chip->dev,
 705                                  "Unable to request irq: %d for use\n",
 706                                  chip->vendor.irq);
 707                         chip->vendor.irq = 0;
 708                 } else {
 709                         /* Clear all existing */
 710                         iowrite32(ioread32
 711                                   (chip->vendor.iobase +
 712                                    TPM_INT_STATUS(chip->vendor.locality)),
 713                                   chip->vendor.iobase +
 714                                   TPM_INT_STATUS(chip->vendor.locality));
 715
 716                         /* Turn on */
 717                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 718                                   chip->vendor.iobase +
 719                                   TPM_INT_ENABLE(chip->vendor.locality));
 720                 }
 721         }
 722
 723         INIT_LIST_HEAD(&chip->vendor.list);
 724         spin_lock(&tis_lock);
 725         list_add(&chip->vendor.list, &tis_chips);
 726         spin_unlock(&tis_lock);
 727
 728         tpm_continue_selftest(chip);
 729
 730         return 0;
 731 out_err:
 732         if (chip->vendor.iobase)
 733                 iounmap(chip->vendor.iobase);
 734         tpm_remove_hardware(chip->dev);
 735         return rc;
 736 }
 737
 738 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
 739 {
 740         u32 intmask;
 741
 742         /* reenable interrupts that device may have lost or
 743            BIOS/firmware may have disabled */
 744         iowrite8(chip->vendor.irq, chip->vendor.iobase +
 745                  TPM_INT_VECTOR(chip->vendor.locality));
 746
 747         intmask =
 748             ioread32(chip->vendor.iobase +
 749                      TPM_INT_ENABLE(chip->vendor.locality));
 750
 751         intmask |= TPM_INTF_CMD_READY_INT
 752             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 753             | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
 754
 755         iowrite32(intmask,
 756                   chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
 757 }
 758
 759
 760 #ifdef CONFIG_PNP
 761 static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 762                                       const struct pnp_device_id *pnp_id)
 763 {
 764         resource_size_t start, len;
 765         unsigned int irq = 0;
 766
 767         start = pnp_mem_start(pnp_dev, 0);
 768         len = pnp_mem_len(pnp_dev, 0);
 769
 770         if (pnp_irq_valid(pnp_dev, 0))
 771                 irq = pnp_irq(pnp_dev, 0);
 772         else
 773                 interrupts = 0;
 774
 775         if (is_itpm(pnp_dev))
 776                 itpm = 1;
 777
 778         return tpm_tis_init(&pnp_dev->dev, start, len, irq);
 779 }
 780
 781 static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
 782 {
 783         return tpm_pm_suspend(&dev->dev, msg);
 784 }
 785
 786 static int tpm_tis_pnp_resume(struct pnp_dev *dev)
 787 {
 788         struct tpm_chip *chip = pnp_get_drvdata(dev);
 789         int ret;
 790
 791         if (chip->vendor.irq)
 792                 tpm_tis_reenable_interrupts(chip);
 793
 794         ret = tpm_pm_resume(&dev->dev);
 795         if (!ret)
 796                 tpm_continue_selftest(chip);
 797
 798         return ret;
 799 }
 800
 801 static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
 802         {"PNP0C31", 0},         /* TPM */
 803         {"ATM1200", 0},         /* Atmel */
 804         {"IFX0102", 0},         /* Infineon */
 805         {"BCM0101", 0},         /* Broadcom */
 806         {"BCM0102", 0},         /* Broadcom */
 807         {"NSC1200", 0},         /* National */
 808         {"ICO0102", 0},         /* Intel */
 809         /* Add new here */
 810         {"", 0},                /* User Specified */
 811         {"", 0}                 /* Terminator */
 812 };
 813 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
 814
 815 static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev)
 816 {
 817         struct tpm_chip *chip = pnp_get_drvdata(dev);
 818
 819         tpm_dev_vendor_release(chip);
 820
 821         kfree(chip);
 822 }
 823
 824
 825 static struct pnp_driver tis_pnp_driver = {
 826         .name = "tpm_tis",
 827         .id_table = tpm_pnp_tbl,
 828         .probe = tpm_tis_pnp_init,
 829         .suspend = tpm_tis_pnp_suspend,
 830         .resume = tpm_tis_pnp_resume,
 831         .remove = tpm_tis_pnp_remove,
 832 };
 833
 834 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 835 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 836                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 837 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 838 #endif
 839 static int tpm_tis_suspend(struct platform_device *dev, pm_message_t msg)
 840 {
 841         return tpm_pm_suspend(&dev->dev, msg);
 842 }
 843
 844 static int tpm_tis_resume(struct platform_device *dev)
 845 {
 846         struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
 847
 848         if (chip->vendor.irq)
 849                 tpm_tis_reenable_interrupts(chip);
 850
 851         return tpm_pm_resume(&dev->dev);
 852 }
 853 static struct platform_driver tis_drv = {
 854         .driver = {
 855                 .name = "tpm_tis",
 856                 .owner          = THIS_MODULE,
 857         },
 858         .suspend = tpm_tis_suspend,
 859         .resume = tpm_tis_resume,
 860 };
 861
 862 static struct platform_device *pdev;
 863
 864 static int force;
 865 module_param(force, bool, 0444);
 866 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 867 static int __init init_tis(void)
 868 {
 869         int rc;
 870 #ifdef CONFIG_PNP
 871         if (!force)
 872                 return pnp_register_driver(&tis_pnp_driver);
 873 #endif
 874
 875         rc = platform_driver_register(&tis_drv);
 876         if (rc < 0)
 877                 return rc;
 878         if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
 879                 return PTR_ERR(pdev);
 880         if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
 881                 platform_device_unregister(pdev);
 882                 platform_driver_unregister(&tis_drv);
 883         }
 884         return rc;
 885 }
 886
 887 static void __exit cleanup_tis(void)
 888 {
 889         struct tpm_vendor_specific *i, *j;
 890         struct tpm_chip *chip;
 891         spin_lock(&tis_lock);
 892         list_for_each_entry_safe(i, j, &tis_chips, list) {
 893                 chip = to_tpm_chip(i);
 894                 tpm_remove_hardware(chip->dev);
 895                 iowrite32(~TPM_GLOBAL_INT_ENABLE &
 896                           ioread32(chip->vendor.iobase +
 897                                    TPM_INT_ENABLE(chip->vendor.
 898                                                   locality)),
 899                           chip->vendor.iobase +
 900                           TPM_INT_ENABLE(chip->vendor.locality));
 901                 release_locality(chip, chip->vendor.locality, 1);
 902                 if (chip->vendor.irq)
 903                         free_irq(chip->vendor.irq, chip);
 904                 iounmap(i->iobase);
 905                 list_del(&i->list);
 906         }
 907         spin_unlock(&tis_lock);
 908 #ifdef CONFIG_PNP
 909         if (!force) {
 910                 pnp_unregister_driver(&tis_pnp_driver);
 911                 return;
 912         }
 913 #endif
 914         platform_device_unregister(pdev);
 915         platform_driver_unregister(&tis_drv);
 916 }
 917
 918 module_init(init_tis);
 919 module_exit(cleanup_tis);
 920 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 921 MODULE_DESCRIPTION("TPM Driver");
 922 MODULE_VERSION("2.0");
 923 MODULE_LICENSE("GPL");