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  * Device driver for TCG/TCPA TPM (trusted platform module).
   9  * Specifications at www.trustedcomputinggroup.org
  10  *
  11  * This device driver implements the TPM interface as defined in
  12  * the TCG TPM Interface Spec version 1.2, revision 1.0.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License as
  16  * published by the Free Software Foundation, version 2 of the
  17  * License.
  18  */
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/pnp.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/wait.h>
  25 #include "tpm.h"
  26
  27 #define TPM_HEADER_SIZE 10
  28
  29 enum tis_access {
  30         TPM_ACCESS_VALID = 0x80,
  31         TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
  32         TPM_ACCESS_REQUEST_PENDING = 0x04,
  33         TPM_ACCESS_REQUEST_USE = 0x02,
  34 };
  35
  36 enum tis_status {
  37         TPM_STS_VALID = 0x80,
  38         TPM_STS_COMMAND_READY = 0x40,
  39         TPM_STS_GO = 0x20,
  40         TPM_STS_DATA_AVAIL = 0x10,
  41         TPM_STS_DATA_EXPECT = 0x08,
  42 };
  43
  44 enum tis_int_flags {
  45         TPM_GLOBAL_INT_ENABLE = 0x80000000,
  46         TPM_INTF_BURST_COUNT_STATIC = 0x100,
  47         TPM_INTF_CMD_READY_INT = 0x080,
  48         TPM_INTF_INT_EDGE_FALLING = 0x040,
  49         TPM_INTF_INT_EDGE_RISING = 0x020,
  50         TPM_INTF_INT_LEVEL_LOW = 0x010,
  51         TPM_INTF_INT_LEVEL_HIGH = 0x008,
  52         TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
  53         TPM_INTF_STS_VALID_INT = 0x002,
  54         TPM_INTF_DATA_AVAIL_INT = 0x001,
  55 };
  56
  57 enum tis_defaults {
  58         TIS_MEM_BASE = 0xFED40000,
  59         TIS_MEM_LEN = 0x5000,
  60         TIS_SHORT_TIMEOUT = 750,        /* ms */
  61         TIS_LONG_TIMEOUT = 2000,        /* 2 sec */
  62 };
  63
  64 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 12))
  65 #define TPM_INT_ENABLE(l)               (0x0008 | ((l) << 12))
  66 #define TPM_INT_VECTOR(l)               (0x000C | ((l) << 12))
  67 #define TPM_INT_STATUS(l)               (0x0010 | ((l) << 12))
  68 #define TPM_INTF_CAPS(l)                (0x0014 | ((l) << 12))
  69 #define TPM_STS(l)                      (0x0018 | ((l) << 12))
  70 #define TPM_DATA_FIFO(l)                (0x0024 | ((l) << 12))
  71
  72 #define TPM_DID_VID(l)                  (0x0F00 | ((l) << 12))
  73 #define TPM_RID(l)                      (0x0F04 | ((l) << 12))
  74
  75 static LIST_HEAD(tis_chips);
  76 static DEFINE_SPINLOCK(tis_lock);
  77
  78 static int check_locality(struct tpm_chip *chip, int l)
  79 {
  80         if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
  81              (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
  82             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
  83                 return chip->vendor.locality = l;
  84
  85         return -1;
  86 }
  87
  88 static void release_locality(struct tpm_chip *chip, int l, int force)
  89 {
  90         if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
  91                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
  92             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
  93                 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
  94                          chip->vendor.iobase + TPM_ACCESS(l));
  95 }
  96
  97 static int request_locality(struct tpm_chip *chip, int l)
  98 {
  99         unsigned long stop;
 100         long rc;
 101
 102         if (check_locality(chip, l) >= 0)
 103                 return l;
 104
 105         iowrite8(TPM_ACCESS_REQUEST_USE,
 106                  chip->vendor.iobase + TPM_ACCESS(l));
 107
 108         if (chip->vendor.irq) {
 109                 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 110                                                       (check_locality
 111                                                        (chip, l) >= 0),
 112                                                       chip->vendor.timeout_a);
 113                 if (rc > 0)
 114                         return l;
 115
 116         } else {
 117                 /* wait for burstcount */
 118                 stop = jiffies + chip->vendor.timeout_a;
 119                 do {
 120                         if (check_locality(chip, l) >= 0)
 121                                 return l;
 122                         msleep(TPM_TIMEOUT);
 123                 }
 124                 while (time_before(jiffies, stop));
 125         }
 126         return -1;
 127 }
 128
 129 static u8 tpm_tis_status(struct tpm_chip *chip)
 130 {
 131         return ioread8(chip->vendor.iobase +
 132                        TPM_STS(chip->vendor.locality));
 133 }
 134
 135 static void tpm_tis_ready(struct tpm_chip *chip)
 136 {
 137         /* this causes the current command to be aborted */
 138         iowrite8(TPM_STS_COMMAND_READY,
 139                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 140 }
 141
 142 static int get_burstcount(struct tpm_chip *chip)
 143 {
 144         unsigned long stop;
 145         int burstcnt;
 146
 147         /* wait for burstcount */
 148         /* which timeout value, spec has 2 answers (c & d) */
 149         stop = jiffies + chip->vendor.timeout_d;
 150         do {
 151                 burstcnt = ioread8(chip->vendor.iobase +
 152                                    TPM_STS(chip->vendor.locality) + 1);
 153                 burstcnt += ioread8(chip->vendor.iobase +
 154                                     TPM_STS(chip->vendor.locality) +
 155                                     2) << 8;
 156                 if (burstcnt)
 157                         return burstcnt;
 158                 msleep(TPM_TIMEOUT);
 159         } while (time_before(jiffies, stop));
 160         return -EBUSY;
 161 }
 162
 163 static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 164                          wait_queue_head_t *queue)
 165 {
 166         unsigned long stop;
 167         long rc;
 168         u8 status;
 169
 170         /* check current status */
 171         status = tpm_tis_status(chip);
 172         if ((status & mask) == mask)
 173                 return 0;
 174
 175         if (chip->vendor.irq) {
 176                 rc = wait_event_interruptible_timeout(*queue,
 177                                                       ((tpm_tis_status
 178                                                         (chip) & mask) ==
 179                                                        mask), timeout);
 180                 if (rc > 0)
 181                         return 0;
 182         } else {
 183                 stop = jiffies + timeout;
 184                 do {
 185                         msleep(TPM_TIMEOUT);
 186                         status = tpm_tis_status(chip);
 187                         if ((status & mask) == mask)
 188                                 return 0;
 189                 } while (time_before(jiffies, stop));
 190         }
 191         return -ETIME;
 192 }
 193
 194 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 195 {
 196         int size = 0, burstcnt;
 197         while (size < count &&
 198                wait_for_stat(chip,
 199                              TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 200                              chip->vendor.timeout_c,
 201                              &chip->vendor.read_queue)
 202                == 0) {
 203                 burstcnt = get_burstcount(chip);
 204                 for (; burstcnt > 0 && size < count; burstcnt--)
 205                         buf[size++] = ioread8(chip->vendor.iobase +
 206                                               TPM_DATA_FIFO(chip->vendor.
 207                                                             locality));
 208         }
 209         return size;
 210 }
 211
 212 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 213 {
 214         int size = 0;
 215         int expected, status;
 216
 217         if (count < TPM_HEADER_SIZE) {
 218                 size = -EIO;
 219                 goto out;
 220         }
 221
 222         /* read first 10 bytes, including tag, paramsize, and result */
 223         if ((size =
 224              recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
 225                 dev_err(chip->dev, "Unable to read header\n");
 226                 goto out;
 227         }
 228
 229         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 230         if (expected > count) {
 231                 size = -EIO;
 232                 goto out;
 233         }
 234
 235         if ((size +=
 236              recv_data(chip, &buf[TPM_HEADER_SIZE],
 237                        expected - TPM_HEADER_SIZE)) < expected) {
 238                 dev_err(chip->dev, "Unable to read remainder of result\n");
 239                 size = -ETIME;
 240                 goto out;
 241         }
 242
 243         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 244                       &chip->vendor.int_queue);
 245         status = tpm_tis_status(chip);
 246         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 247                 dev_err(chip->dev, "Error left over data\n");
 248                 size = -EIO;
 249                 goto out;
 250         }
 251
 252 out:
 253         tpm_tis_ready(chip);
 254         release_locality(chip, chip->vendor.locality, 0);
 255         return size;
 256 }
 257
 258 /*
 259  * If interrupts are used (signaled by an irq set in the vendor structure)
 260  * tpm.c can skip polling for the data to be available as the interrupt is
 261  * waited for here
 262  */
 263 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 264 {
 265         int rc, status, burstcnt;
 266         size_t count = 0;
 267         u32 ordinal;
 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_stat
 276                     (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 277                      &chip->vendor.int_queue) < 0) {
 278                         rc = -ETIME;
 279                         goto out_err;
 280                 }
 281         }
 282
 283         while (count < len - 1) {
 284                 burstcnt = get_burstcount(chip);
 285                 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
 286                         iowrite8(buf[count], chip->vendor.iobase +
 287                                  TPM_DATA_FIFO(chip->vendor.locality));
 288                         count++;
 289                 }
 290
 291                 wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 292                               &chip->vendor.int_queue);
 293                 status = tpm_tis_status(chip);
 294                 if ((status & TPM_STS_DATA_EXPECT) == 0) {
 295                         rc = -EIO;
 296                         goto out_err;
 297                 }
 298         }
 299
 300         /* write last byte */
 301         iowrite8(buf[count],
 302                  chip->vendor.iobase +
 303                  TPM_DATA_FIFO(chip->vendor.locality));
 304         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 305                       &chip->vendor.int_queue);
 306         status = tpm_tis_status(chip);
 307         if ((status & TPM_STS_DATA_EXPECT) != 0) {
 308                 rc = -EIO;
 309                 goto out_err;
 310         }
 311
 312         /* go and do it */
 313         iowrite8(TPM_STS_GO,
 314                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 315
 316         if (chip->vendor.irq) {
 317                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 318                 if (wait_for_stat
 319                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 320                      tpm_calc_ordinal_duration(chip, ordinal),
 321                      &chip->vendor.read_queue) < 0) {
 322                         rc = -ETIME;
 323                         goto out_err;
 324                 }
 325         }
 326         return len;
 327 out_err:
 328         tpm_tis_ready(chip);
 329         release_locality(chip, chip->vendor.locality, 0);
 330         return rc;
 331 }
 332
 333 static struct file_operations tis_ops = {
 334         .owner = THIS_MODULE,
 335         .llseek = no_llseek,
 336         .open = tpm_open,
 337         .read = tpm_read,
 338         .write = tpm_write,
 339         .release = tpm_release,
 340 };
 341
 342 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 343 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 344 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 345 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 346 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 347 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 348                    NULL);
 349 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 350 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 351
 352 static struct attribute *tis_attrs[] = {
 353         &dev_attr_pubek.attr,
 354         &dev_attr_pcrs.attr,
 355         &dev_attr_enabled.attr,
 356         &dev_attr_active.attr,
 357         &dev_attr_owned.attr,
 358         &dev_attr_temp_deactivated.attr,
 359         &dev_attr_caps.attr,
 360         &dev_attr_cancel.attr, NULL,
 361 };
 362
 363 static struct attribute_group tis_attr_grp = {
 364         .attrs = tis_attrs
 365 };
 366
 367 static struct tpm_vendor_specific tpm_tis = {
 368         .status = tpm_tis_status,
 369         .recv = tpm_tis_recv,
 370         .send = tpm_tis_send,
 371         .cancel = tpm_tis_ready,
 372         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 373         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 374         .req_canceled = TPM_STS_COMMAND_READY,
 375         .attr_group = &tis_attr_grp,
 376         .miscdev = {
 377                     .fops = &tis_ops,},
 378 };
 379
 380 static irqreturn_t tis_int_probe(int irq, void *dev_id, struct pt_regs *regs)
 381 {
 382         struct tpm_chip *chip = (struct tpm_chip *) dev_id;
 383         u32 interrupt;
 384
 385         interrupt = ioread32(chip->vendor.iobase +
 386                              TPM_INT_STATUS(chip->vendor.locality));
 387
 388         if (interrupt == 0)
 389                 return IRQ_NONE;
 390
 391         chip->vendor.irq = irq;
 392
 393         /* Clear interrupts handled with TPM_EOI */
 394         iowrite32(interrupt,
 395                   chip->vendor.iobase +
 396                   TPM_INT_STATUS(chip->vendor.locality));
 397         return IRQ_HANDLED;
 398 }
 399
 400 static irqreturn_t tis_int_handler(int irq, void *dev_id, struct pt_regs *regs)
 401 {
 402         struct tpm_chip *chip = (struct tpm_chip *) dev_id;
 403         u32 interrupt;
 404         int i;
 405
 406         interrupt = ioread32(chip->vendor.iobase +
 407                              TPM_INT_STATUS(chip->vendor.locality));
 408
 409         if (interrupt == 0)
 410                 return IRQ_NONE;
 411
 412         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 413                 wake_up_interruptible(&chip->vendor.read_queue);
 414         if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
 415                 for (i = 0; i < 5; i++)
 416                         if (check_locality(chip, i) >= 0)
 417                                 break;
 418         if (interrupt &
 419             (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
 420              TPM_INTF_CMD_READY_INT))
 421                 wake_up_interruptible(&chip->vendor.int_queue);
 422
 423         /* Clear interrupts handled with TPM_EOI */
 424         iowrite32(interrupt,
 425                   chip->vendor.iobase +
 426                   TPM_INT_STATUS(chip->vendor.locality));
 427         return IRQ_HANDLED;
 428 }
 429
 430 static int interrupts = 1;
 431 module_param(interrupts, bool, 0444);
 432 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 433
 434 static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 435                                       const struct pnp_device_id *pnp_id)
 436 {
 437         u32 vendor, intfcaps, intmask;
 438         int rc, i;
 439         unsigned long start, len;
 440         struct tpm_chip *chip;
 441
 442         start = pnp_mem_start(pnp_dev, 0);
 443         len = pnp_mem_len(pnp_dev, 0);
 444
 445         if (!start)
 446                 start = TIS_MEM_BASE;
 447         if (!len)
 448                 len = TIS_MEM_LEN;
 449
 450         if (!(chip = tpm_register_hardware(&pnp_dev->dev, &tpm_tis)))
 451                 return -ENODEV;
 452
 453         chip->vendor.iobase = ioremap(start, len);
 454         if (!chip->vendor.iobase) {
 455                 rc = -EIO;
 456                 goto out_err;
 457         }
 458
 459         vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 460
 461         /* Default timeouts */
 462         chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 463         chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 464         chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 465         chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 466
 467         dev_info(&pnp_dev->dev,
 468                  "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 469                  vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 470
 471         /* Figure out the capabilities */
 472         intfcaps =
 473             ioread32(chip->vendor.iobase +
 474                      TPM_INTF_CAPS(chip->vendor.locality));
 475         dev_dbg(&pnp_dev->dev, "TPM interface capabilities (0x%x):\n",
 476                 intfcaps);
 477         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 478                 dev_dbg(&pnp_dev->dev, "\tBurst Count Static\n");
 479         if (intfcaps & TPM_INTF_CMD_READY_INT)
 480                 dev_dbg(&pnp_dev->dev, "\tCommand Ready Int Support\n");
 481         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 482                 dev_dbg(&pnp_dev->dev, "\tInterrupt Edge Falling\n");
 483         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 484                 dev_dbg(&pnp_dev->dev, "\tInterrupt Edge Rising\n");
 485         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 486                 dev_dbg(&pnp_dev->dev, "\tInterrupt Level Low\n");
 487         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 488                 dev_dbg(&pnp_dev->dev, "\tInterrupt Level High\n");
 489         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 490                 dev_dbg(&pnp_dev->dev, "\tLocality Change Int Support\n");
 491         if (intfcaps & TPM_INTF_STS_VALID_INT)
 492                 dev_dbg(&pnp_dev->dev, "\tSts Valid Int Support\n");
 493         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 494                 dev_dbg(&pnp_dev->dev, "\tData Avail Int Support\n");
 495
 496         if (request_locality(chip, 0) != 0) {
 497                 rc = -ENODEV;
 498                 goto out_err;
 499         }
 500
 501         /* INTERRUPT Setup */
 502         init_waitqueue_head(&chip->vendor.read_queue);
 503         init_waitqueue_head(&chip->vendor.int_queue);
 504
 505         intmask =
 506             ioread32(chip->vendor.iobase +
 507                      TPM_INT_ENABLE(chip->vendor.locality));
 508
 509         intmask |= TPM_INTF_CMD_READY_INT
 510             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 511             | TPM_INTF_STS_VALID_INT;
 512
 513         iowrite32(intmask,
 514                   chip->vendor.iobase +
 515                   TPM_INT_ENABLE(chip->vendor.locality));
 516         if (interrupts) {
 517                 chip->vendor.irq =
 518                     ioread8(chip->vendor.iobase +
 519                             TPM_INT_VECTOR(chip->vendor.locality));
 520
 521                 for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
 522                         iowrite8(i, chip->vendor.iobase +
 523                                     TPM_INT_VECTOR(chip->vendor.locality));
 524                         if (request_irq
 525                             (i, tis_int_probe, SA_SHIRQ,
 526                              chip->vendor.miscdev.name, chip) != 0) {
 527                                 dev_info(chip->dev,
 528                                          "Unable to request irq: %d for probe\n",
 529                                          i);
 530                                 continue;
 531                         }
 532
 533                         /* Clear all existing */
 534                         iowrite32(ioread32
 535                                   (chip->vendor.iobase +
 536                                    TPM_INT_STATUS(chip->vendor.locality)),
 537                                   chip->vendor.iobase +
 538                                   TPM_INT_STATUS(chip->vendor.locality));
 539
 540                         /* Turn on */
 541                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 542                                   chip->vendor.iobase +
 543                                   TPM_INT_ENABLE(chip->vendor.locality));
 544
 545                         /* Generate Interrupts */
 546                         tpm_gen_interrupt(chip);
 547
 548                         /* Turn off */
 549                         iowrite32(intmask,
 550                                   chip->vendor.iobase +
 551                                   TPM_INT_ENABLE(chip->vendor.locality));
 552                         free_irq(i, chip);
 553                 }
 554         }
 555         if (chip->vendor.irq) {
 556                 iowrite8(chip->vendor.irq,
 557                          chip->vendor.iobase +
 558                          TPM_INT_VECTOR(chip->vendor.locality));
 559                 if (request_irq
 560                     (chip->vendor.irq, tis_int_handler, SA_SHIRQ,
 561                      chip->vendor.miscdev.name, chip) != 0) {
 562                         dev_info(chip->dev,
 563                                  "Unable to request irq: %d for use\n",
 564                                  chip->vendor.irq);
 565                         chip->vendor.irq = 0;
 566                 } else {
 567                         /* Clear all existing */
 568                         iowrite32(ioread32
 569                                   (chip->vendor.iobase +
 570                                    TPM_INT_STATUS(chip->vendor.locality)),
 571                                   chip->vendor.iobase +
 572                                   TPM_INT_STATUS(chip->vendor.locality));
 573
 574                         /* Turn on */
 575                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 576                                   chip->vendor.iobase +
 577                                   TPM_INT_ENABLE(chip->vendor.locality));
 578                 }
 579         }
 580
 581         INIT_LIST_HEAD(&chip->vendor.list);
 582         spin_lock(&tis_lock);
 583         list_add(&chip->vendor.list, &tis_chips);
 584         spin_unlock(&tis_lock);
 585
 586         tpm_get_timeouts(chip);
 587         tpm_continue_selftest(chip);
 588
 589         return 0;
 590 out_err:
 591         if (chip->vendor.iobase)
 592                 iounmap(chip->vendor.iobase);
 593         tpm_remove_hardware(chip->dev);
 594         return rc;
 595 }
 596
 597 static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
 598 {
 599         return tpm_pm_suspend(&dev->dev, msg);
 600 }
 601
 602 static int tpm_tis_pnp_resume(struct pnp_dev *dev)
 603 {
 604         return tpm_pm_resume(&dev->dev);
 605 }
 606
 607 static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
 608         {"PNP0C31", 0},         /* TPM */
 609         {"ATM1200", 0},         /* Atmel */
 610         {"IFX0102", 0},         /* Infineon */
 611         {"BCM0101", 0},         /* Broadcom */
 612         {"NSC1200", 0},         /* National */
 613         /* Add new here */
 614         {"", 0},                /* User Specified */
 615         {"", 0}                 /* Terminator */
 616 };
 617
 618 static struct pnp_driver tis_pnp_driver = {
 619         .name = "tpm_tis",
 620         .id_table = tpm_pnp_tbl,
 621         .probe = tpm_tis_pnp_init,
 622         .suspend = tpm_tis_pnp_suspend,
 623         .resume = tpm_tis_pnp_resume,
 624 };
 625
 626 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 627 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 628                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 629 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 630
 631 static int __init init_tis(void)
 632 {
 633         return pnp_register_driver(&tis_pnp_driver);
 634 }
 635
 636 static void __exit cleanup_tis(void)
 637 {
 638         struct tpm_vendor_specific *i, *j;
 639         struct tpm_chip *chip;
 640         spin_lock(&tis_lock);
 641         list_for_each_entry_safe(i, j, &tis_chips, list) {
 642                 chip = to_tpm_chip(i);
 643                 iowrite32(~TPM_GLOBAL_INT_ENABLE &
 644                           ioread32(chip->vendor.iobase +
 645                                    TPM_INT_ENABLE(chip->vendor.
 646                                                   locality)),
 647                           chip->vendor.iobase +
 648                           TPM_INT_ENABLE(chip->vendor.locality));
 649                 release_locality(chip, chip->vendor.locality, 1);
 650                 if (chip->vendor.irq)
 651                         free_irq(chip->vendor.irq, chip);
 652                 iounmap(i->iobase);
 653                 list_del(&i->list);
 654                 tpm_remove_hardware(chip->dev);
 655         }
 656         spin_unlock(&tis_lock);
 657         pnp_unregister_driver(&tis_pnp_driver);
 658 }
 659
 660 module_init(init_tis);
 661 module_exit(cleanup_tis);
 662 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 663 MODULE_DESCRIPTION("TPM Driver");
 664 MODULE_VERSION("2.0");
 665 MODULE_LICENSE("GPL");