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 "tpm.h"
  30
  31 #define TPM_HEADER_SIZE 10
  32
  33 enum tis_access {
  34         TPM_ACCESS_VALID = 0x80,
  35         TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
  36         TPM_ACCESS_REQUEST_PENDING = 0x04,
  37         TPM_ACCESS_REQUEST_USE = 0x02,
  38 };
  39
  40 enum tis_status {
  41         TPM_STS_VALID = 0x80,
  42         TPM_STS_COMMAND_READY = 0x40,
  43         TPM_STS_GO = 0x20,
  44         TPM_STS_DATA_AVAIL = 0x10,
  45         TPM_STS_DATA_EXPECT = 0x08,
  46 };
  47
  48 enum tis_int_flags {
  49         TPM_GLOBAL_INT_ENABLE = 0x80000000,
  50         TPM_INTF_BURST_COUNT_STATIC = 0x100,
  51         TPM_INTF_CMD_READY_INT = 0x080,
  52         TPM_INTF_INT_EDGE_FALLING = 0x040,
  53         TPM_INTF_INT_EDGE_RISING = 0x020,
  54         TPM_INTF_INT_LEVEL_LOW = 0x010,
  55         TPM_INTF_INT_LEVEL_HIGH = 0x008,
  56         TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
  57         TPM_INTF_STS_VALID_INT = 0x002,
  58         TPM_INTF_DATA_AVAIL_INT = 0x001,
  59 };
  60
  61 enum tis_defaults {
  62         TIS_MEM_BASE = 0xFED40000,
  63         TIS_MEM_LEN = 0x5000,
  64         TIS_SHORT_TIMEOUT = 750,        /* ms */
  65         TIS_LONG_TIMEOUT = 2000,        /* 2 sec */
  66 };
  67
  68 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 12))
  69 #define TPM_INT_ENABLE(l)               (0x0008 | ((l) << 12))
  70 #define TPM_INT_VECTOR(l)               (0x000C | ((l) << 12))
  71 #define TPM_INT_STATUS(l)               (0x0010 | ((l) << 12))
  72 #define TPM_INTF_CAPS(l)                (0x0014 | ((l) << 12))
  73 #define TPM_STS(l)                      (0x0018 | ((l) << 12))
  74 #define TPM_DATA_FIFO(l)                (0x0024 | ((l) << 12))
  75
  76 #define TPM_DID_VID(l)                  (0x0F00 | ((l) << 12))
  77 #define TPM_RID(l)                      (0x0F04 | ((l) << 12))
  78
  79 static LIST_HEAD(tis_chips);
  80 static DEFINE_SPINLOCK(tis_lock);
  81
  82 #ifdef CONFIG_ACPI
  83 static int is_itpm(struct pnp_dev *dev)
  84 {
  85         struct acpi_device *acpi = pnp_acpi_device(dev);
  86         struct acpi_hardware_id *id;
  87
  88         list_for_each_entry(id, &acpi->pnp.ids, list) {
  89                 if (!strcmp("INTC0102", id->id))
  90                         return 1;
  91         }
  92
  93         return 0;
  94 }
  95 #else
  96 static int is_itpm(struct pnp_dev *dev)
  97 {
  98         return 0;
  99 }
 100 #endif
 101
 102 static int check_locality(struct tpm_chip *chip, int l)
 103 {
 104         if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 105              (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 106             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
 107                 return chip->vendor.locality = l;
 108
 109         return -1;
 110 }
 111
 112 static void release_locality(struct tpm_chip *chip, int l, int force)
 113 {
 114         if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 115                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
 116             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
 117                 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
 118                          chip->vendor.iobase + TPM_ACCESS(l));
 119 }
 120
 121 static int request_locality(struct tpm_chip *chip, int l)
 122 {
 123         unsigned long stop;
 124         long rc;
 125
 126         if (check_locality(chip, l) >= 0)
 127                 return l;
 128
 129         iowrite8(TPM_ACCESS_REQUEST_USE,
 130                  chip->vendor.iobase + TPM_ACCESS(l));
 131
 132         if (chip->vendor.irq) {
 133                 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 134                                                       (check_locality
 135                                                        (chip, l) >= 0),
 136                                                       chip->vendor.timeout_a);
 137                 if (rc > 0)
 138                         return l;
 139
 140         } else {
 141                 /* wait for burstcount */
 142                 stop = jiffies + chip->vendor.timeout_a;
 143                 do {
 144                         if (check_locality(chip, l) >= 0)
 145                                 return l;
 146                         msleep(TPM_TIMEOUT);
 147                 }
 148                 while (time_before(jiffies, stop));
 149         }
 150         return -1;
 151 }
 152
 153 static u8 tpm_tis_status(struct tpm_chip *chip)
 154 {
 155         return ioread8(chip->vendor.iobase +
 156                        TPM_STS(chip->vendor.locality));
 157 }
 158
 159 static void tpm_tis_ready(struct tpm_chip *chip)
 160 {
 161         /* this causes the current command to be aborted */
 162         iowrite8(TPM_STS_COMMAND_READY,
 163                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 164 }
 165
 166 static int get_burstcount(struct tpm_chip *chip)
 167 {
 168         unsigned long stop;
 169         int burstcnt;
 170
 171         /* wait for burstcount */
 172         /* which timeout value, spec has 2 answers (c & d) */
 173         stop = jiffies + chip->vendor.timeout_d;
 174         do {
 175                 burstcnt = ioread8(chip->vendor.iobase +
 176                                    TPM_STS(chip->vendor.locality) + 1);
 177                 burstcnt += ioread8(chip->vendor.iobase +
 178                                     TPM_STS(chip->vendor.locality) +
 179                                     2) << 8;
 180                 if (burstcnt)
 181                         return burstcnt;
 182                 msleep(TPM_TIMEOUT);
 183         } while (time_before(jiffies, stop));
 184         return -EBUSY;
 185 }
 186
 187 static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 188                          wait_queue_head_t *queue)
 189 {
 190         unsigned long stop;
 191         long rc;
 192         u8 status;
 193
 194         /* check current status */
 195         status = tpm_tis_status(chip);
 196         if ((status & mask) == mask)
 197                 return 0;
 198
 199         if (chip->vendor.irq) {
 200                 rc = wait_event_interruptible_timeout(*queue,
 201                                                       ((tpm_tis_status
 202                                                         (chip) & mask) ==
 203                                                        mask), timeout);
 204                 if (rc > 0)
 205                         return 0;
 206         } else {
 207                 stop = jiffies + timeout;
 208                 do {
 209                         msleep(TPM_TIMEOUT);
 210                         status = tpm_tis_status(chip);
 211                         if ((status & mask) == mask)
 212                                 return 0;
 213                 } while (time_before(jiffies, stop));
 214         }
 215         return -ETIME;
 216 }
 217
 218 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 219 {
 220         int size = 0, burstcnt;
 221         while (size < count &&
 222                wait_for_stat(chip,
 223                              TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 224                              chip->vendor.timeout_c,
 225                              &chip->vendor.read_queue)
 226                == 0) {
 227                 burstcnt = get_burstcount(chip);
 228                 for (; burstcnt > 0 && size < count; burstcnt--)
 229                         buf[size++] = ioread8(chip->vendor.iobase +
 230                                               TPM_DATA_FIFO(chip->vendor.
 231                                                             locality));
 232         }
 233         return size;
 234 }
 235
 236 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 237 {
 238         int size = 0;
 239         int expected, status;
 240
 241         if (count < TPM_HEADER_SIZE) {
 242                 size = -EIO;
 243                 goto out;
 244         }
 245
 246         /* read first 10 bytes, including tag, paramsize, and result */
 247         if ((size =
 248              recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
 249                 dev_err(chip->dev, "Unable to read header\n");
 250                 goto out;
 251         }
 252
 253         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 254         if (expected > count) {
 255                 size = -EIO;
 256                 goto out;
 257         }
 258
 259         if ((size +=
 260              recv_data(chip, &buf[TPM_HEADER_SIZE],
 261                        expected - TPM_HEADER_SIZE)) < expected) {
 262                 dev_err(chip->dev, "Unable to read remainder of result\n");
 263                 size = -ETIME;
 264                 goto out;
 265         }
 266
 267         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 268                       &chip->vendor.int_queue);
 269         status = tpm_tis_status(chip);
 270         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 271                 dev_err(chip->dev, "Error left over data\n");
 272                 size = -EIO;
 273                 goto out;
 274         }
 275
 276 out:
 277         tpm_tis_ready(chip);
 278         release_locality(chip, chip->vendor.locality, 0);
 279         return size;
 280 }
 281
 282 static int itpm;
 283 module_param(itpm, bool, 0444);
 284 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
 285
 286 /*
 287  * If interrupts are used (signaled by an irq set in the vendor structure)
 288  * tpm.c can skip polling for the data to be available as the interrupt is
 289  * waited for here
 290  */
 291 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 292 {
 293         int rc, status, burstcnt;
 294         size_t count = 0;
 295         u32 ordinal;
 296
 297         if (request_locality(chip, 0) < 0)
 298                 return -EBUSY;
 299
 300         status = tpm_tis_status(chip);
 301         if ((status & TPM_STS_COMMAND_READY) == 0) {
 302                 tpm_tis_ready(chip);
 303                 if (wait_for_stat
 304                     (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 305                      &chip->vendor.int_queue) < 0) {
 306                         rc = -ETIME;
 307                         goto out_err;
 308                 }
 309         }
 310
 311         while (count < len - 1) {
 312                 burstcnt = get_burstcount(chip);
 313                 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
 314                         iowrite8(buf[count], chip->vendor.iobase +
 315                                  TPM_DATA_FIFO(chip->vendor.locality));
 316                         count++;
 317                 }
 318
 319                 wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 320                               &chip->vendor.int_queue);
 321                 status = tpm_tis_status(chip);
 322                 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
 323                         rc = -EIO;
 324                         goto out_err;
 325                 }
 326         }
 327
 328         /* write last byte */
 329         iowrite8(buf[count],
 330                  chip->vendor.iobase +
 331                  TPM_DATA_FIFO(chip->vendor.locality));
 332         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 333                       &chip->vendor.int_queue);
 334         status = tpm_tis_status(chip);
 335         if ((status & TPM_STS_DATA_EXPECT) != 0) {
 336                 rc = -EIO;
 337                 goto out_err;
 338         }
 339
 340         /* go and do it */
 341         iowrite8(TPM_STS_GO,
 342                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 343
 344         if (chip->vendor.irq) {
 345                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 346                 if (wait_for_stat
 347                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 348                      tpm_calc_ordinal_duration(chip, ordinal),
 349                      &chip->vendor.read_queue) < 0) {
 350                         rc = -ETIME;
 351                         goto out_err;
 352                 }
 353         }
 354         return len;
 355 out_err:
 356         tpm_tis_ready(chip);
 357         release_locality(chip, chip->vendor.locality, 0);
 358         return rc;
 359 }
 360
 361 static const struct file_operations tis_ops = {
 362         .owner = THIS_MODULE,
 363         .llseek = no_llseek,
 364         .open = tpm_open,
 365         .read = tpm_read,
 366         .write = tpm_write,
 367         .release = tpm_release,
 368 };
 369
 370 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 371 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 372 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 373 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 374 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 375 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 376                    NULL);
 377 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 378 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 379 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 380
 381 static struct attribute *tis_attrs[] = {
 382         &dev_attr_pubek.attr,
 383         &dev_attr_pcrs.attr,
 384         &dev_attr_enabled.attr,
 385         &dev_attr_active.attr,
 386         &dev_attr_owned.attr,
 387         &dev_attr_temp_deactivated.attr,
 388         &dev_attr_caps.attr,
 389         &dev_attr_cancel.attr,
 390         &dev_attr_timeouts.attr, NULL,
 391 };
 392
 393 static struct attribute_group tis_attr_grp = {
 394         .attrs = tis_attrs
 395 };
 396
 397 static struct tpm_vendor_specific tpm_tis = {
 398         .status = tpm_tis_status,
 399         .recv = tpm_tis_recv,
 400         .send = tpm_tis_send,
 401         .cancel = tpm_tis_ready,
 402         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 403         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 404         .req_canceled = TPM_STS_COMMAND_READY,
 405         .attr_group = &tis_attr_grp,
 406         .miscdev = {
 407                     .fops = &tis_ops,},
 408 };
 409
 410 static irqreturn_t tis_int_probe(int irq, void *dev_id)
 411 {
 412         struct tpm_chip *chip = dev_id;
 413         u32 interrupt;
 414
 415         interrupt = ioread32(chip->vendor.iobase +
 416                              TPM_INT_STATUS(chip->vendor.locality));
 417
 418         if (interrupt == 0)
 419                 return IRQ_NONE;
 420
 421         chip->vendor.irq = irq;
 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 irqreturn_t tis_int_handler(int dummy, void *dev_id)
 431 {
 432         struct tpm_chip *chip = dev_id;
 433         u32 interrupt;
 434         int i;
 435
 436         interrupt = ioread32(chip->vendor.iobase +
 437                              TPM_INT_STATUS(chip->vendor.locality));
 438
 439         if (interrupt == 0)
 440                 return IRQ_NONE;
 441
 442         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 443                 wake_up_interruptible(&chip->vendor.read_queue);
 444         if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
 445                 for (i = 0; i < 5; i++)
 446                         if (check_locality(chip, i) >= 0)
 447                                 break;
 448         if (interrupt &
 449             (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
 450              TPM_INTF_CMD_READY_INT))
 451                 wake_up_interruptible(&chip->vendor.int_queue);
 452
 453         /* Clear interrupts handled with TPM_EOI */
 454         iowrite32(interrupt,
 455                   chip->vendor.iobase +
 456                   TPM_INT_STATUS(chip->vendor.locality));
 457         ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
 458         return IRQ_HANDLED;
 459 }
 460
 461 static int interrupts = 1;
 462 module_param(interrupts, bool, 0444);
 463 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 464
 465 static int tpm_tis_init(struct device *dev, resource_size_t start,
 466                         resource_size_t len, unsigned int irq)
 467 {
 468         u32 vendor, intfcaps, intmask;
 469         int rc, i;
 470         struct tpm_chip *chip;
 471
 472         if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
 473                 return -ENODEV;
 474
 475         chip->vendor.iobase = ioremap(start, len);
 476         if (!chip->vendor.iobase) {
 477                 rc = -EIO;
 478                 goto out_err;
 479         }
 480
 481         /* Default timeouts */
 482         chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 483         chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 484         chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 485         chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 486
 487         if (request_locality(chip, 0) != 0) {
 488                 rc = -ENODEV;
 489                 goto out_err;
 490         }
 491
 492         vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 493
 494         dev_info(dev,
 495                  "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 496                  vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 497
 498         if (itpm)
 499                 dev_info(dev, "Intel iTPM workaround enabled\n");
 500
 501
 502         /* Figure out the capabilities */
 503         intfcaps =
 504             ioread32(chip->vendor.iobase +
 505                      TPM_INTF_CAPS(chip->vendor.locality));
 506         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 507                 intfcaps);
 508         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 509                 dev_dbg(dev, "\tBurst Count Static\n");
 510         if (intfcaps & TPM_INTF_CMD_READY_INT)
 511                 dev_dbg(dev, "\tCommand Ready Int Support\n");
 512         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 513                 dev_dbg(dev, "\tInterrupt Edge Falling\n");
 514         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 515                 dev_dbg(dev, "\tInterrupt Edge Rising\n");
 516         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 517                 dev_dbg(dev, "\tInterrupt Level Low\n");
 518         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 519                 dev_dbg(dev, "\tInterrupt Level High\n");
 520         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 521                 dev_dbg(dev, "\tLocality Change Int Support\n");
 522         if (intfcaps & TPM_INTF_STS_VALID_INT)
 523                 dev_dbg(dev, "\tSts Valid Int Support\n");
 524         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 525                 dev_dbg(dev, "\tData Avail Int Support\n");
 526
 527         /* INTERRUPT Setup */
 528         init_waitqueue_head(&chip->vendor.read_queue);
 529         init_waitqueue_head(&chip->vendor.int_queue);
 530
 531         intmask =
 532             ioread32(chip->vendor.iobase +
 533                      TPM_INT_ENABLE(chip->vendor.locality));
 534
 535         intmask |= TPM_INTF_CMD_READY_INT
 536             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 537             | TPM_INTF_STS_VALID_INT;
 538
 539         iowrite32(intmask,
 540                   chip->vendor.iobase +
 541                   TPM_INT_ENABLE(chip->vendor.locality));
 542         if (interrupts)
 543                 chip->vendor.irq = irq;
 544         if (interrupts && !chip->vendor.irq) {
 545                 chip->vendor.irq =
 546                     ioread8(chip->vendor.iobase +
 547                             TPM_INT_VECTOR(chip->vendor.locality));
 548
 549                 for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
 550                         iowrite8(i, chip->vendor.iobase +
 551                                     TPM_INT_VECTOR(chip->vendor.locality));
 552                         if (request_irq
 553                             (i, tis_int_probe, IRQF_SHARED,
 554                              chip->vendor.miscdev.name, chip) != 0) {
 555                                 dev_info(chip->dev,
 556                                          "Unable to request irq: %d for probe\n",
 557                                          i);
 558                                 continue;
 559                         }
 560
 561                         /* Clear all existing */
 562                         iowrite32(ioread32
 563                                   (chip->vendor.iobase +
 564                                    TPM_INT_STATUS(chip->vendor.locality)),
 565                                   chip->vendor.iobase +
 566                                   TPM_INT_STATUS(chip->vendor.locality));
 567
 568                         /* Turn on */
 569                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 570                                   chip->vendor.iobase +
 571                                   TPM_INT_ENABLE(chip->vendor.locality));
 572
 573                         /* Generate Interrupts */
 574                         tpm_gen_interrupt(chip);
 575
 576                         /* Turn off */
 577                         iowrite32(intmask,
 578                                   chip->vendor.iobase +
 579                                   TPM_INT_ENABLE(chip->vendor.locality));
 580                         free_irq(i, chip);
 581                 }
 582         }
 583         if (chip->vendor.irq) {
 584                 iowrite8(chip->vendor.irq,
 585                          chip->vendor.iobase +
 586                          TPM_INT_VECTOR(chip->vendor.locality));
 587                 if (request_irq
 588                     (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
 589                      chip->vendor.miscdev.name, chip) != 0) {
 590                         dev_info(chip->dev,
 591                                  "Unable to request irq: %d for use\n",
 592                                  chip->vendor.irq);
 593                         chip->vendor.irq = 0;
 594                 } else {
 595                         /* Clear all existing */
 596                         iowrite32(ioread32
 597                                   (chip->vendor.iobase +
 598                                    TPM_INT_STATUS(chip->vendor.locality)),
 599                                   chip->vendor.iobase +
 600                                   TPM_INT_STATUS(chip->vendor.locality));
 601
 602                         /* Turn on */
 603                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 604                                   chip->vendor.iobase +
 605                                   TPM_INT_ENABLE(chip->vendor.locality));
 606                 }
 607         }
 608
 609         INIT_LIST_HEAD(&chip->vendor.list);
 610         spin_lock(&tis_lock);
 611         list_add(&chip->vendor.list, &tis_chips);
 612         spin_unlock(&tis_lock);
 613
 614         tpm_get_timeouts(chip);
 615         tpm_continue_selftest(chip);
 616
 617         return 0;
 618 out_err:
 619         if (chip->vendor.iobase)
 620                 iounmap(chip->vendor.iobase);
 621         tpm_remove_hardware(chip->dev);
 622         return rc;
 623 }
 624 #ifdef CONFIG_PNP
 625 static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 626                                       const struct pnp_device_id *pnp_id)
 627 {
 628         resource_size_t start, len;
 629         unsigned int irq = 0;
 630
 631         start = pnp_mem_start(pnp_dev, 0);
 632         len = pnp_mem_len(pnp_dev, 0);
 633
 634         if (pnp_irq_valid(pnp_dev, 0))
 635                 irq = pnp_irq(pnp_dev, 0);
 636         else
 637                 interrupts = 0;
 638
 639         if (is_itpm(pnp_dev))
 640                 itpm = 1;
 641
 642         return tpm_tis_init(&pnp_dev->dev, start, len, irq);
 643 }
 644
 645 static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
 646 {
 647         return tpm_pm_suspend(&dev->dev, msg);
 648 }
 649
 650 static int tpm_tis_pnp_resume(struct pnp_dev *dev)
 651 {
 652         struct tpm_chip *chip = pnp_get_drvdata(dev);
 653         int ret;
 654
 655         ret = tpm_pm_resume(&dev->dev);
 656         if (!ret)
 657                 tpm_continue_selftest(chip);
 658
 659         return ret;
 660 }
 661
 662 static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
 663         {"PNP0C31", 0},         /* TPM */
 664         {"ATM1200", 0},         /* Atmel */
 665         {"IFX0102", 0},         /* Infineon */
 666         {"BCM0101", 0},         /* Broadcom */
 667         {"BCM0102", 0},         /* Broadcom */
 668         {"NSC1200", 0},         /* National */
 669         {"ICO0102", 0},         /* Intel */
 670         /* Add new here */
 671         {"", 0},                /* User Specified */
 672         {"", 0}                 /* Terminator */
 673 };
 674 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
 675
 676 static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev)
 677 {
 678         struct tpm_chip *chip = pnp_get_drvdata(dev);
 679
 680         tpm_dev_vendor_release(chip);
 681
 682         kfree(chip);
 683 }
 684
 685
 686 static struct pnp_driver tis_pnp_driver = {
 687         .name = "tpm_tis",
 688         .id_table = tpm_pnp_tbl,
 689         .probe = tpm_tis_pnp_init,
 690         .suspend = tpm_tis_pnp_suspend,
 691         .resume = tpm_tis_pnp_resume,
 692         .remove = tpm_tis_pnp_remove,
 693 };
 694
 695 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 696 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 697                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 698 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 699 #endif
 700 static int tpm_tis_suspend(struct platform_device *dev, pm_message_t msg)
 701 {
 702         return tpm_pm_suspend(&dev->dev, msg);
 703 }
 704
 705 static int tpm_tis_resume(struct platform_device *dev)
 706 {
 707         return tpm_pm_resume(&dev->dev);
 708 }
 709 static struct platform_driver tis_drv = {
 710         .driver = {
 711                 .name = "tpm_tis",
 712                 .owner          = THIS_MODULE,
 713         },
 714         .suspend = tpm_tis_suspend,
 715         .resume = tpm_tis_resume,
 716 };
 717
 718 static struct platform_device *pdev;
 719
 720 static int force;
 721 module_param(force, bool, 0444);
 722 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 723 static int __init init_tis(void)
 724 {
 725         int rc;
 726 #ifdef CONFIG_PNP
 727         if (!force)
 728                 return pnp_register_driver(&tis_pnp_driver);
 729 #endif
 730
 731         rc = platform_driver_register(&tis_drv);
 732         if (rc < 0)
 733                 return rc;
 734         if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
 735                 return PTR_ERR(pdev);
 736         if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
 737                 platform_device_unregister(pdev);
 738                 platform_driver_unregister(&tis_drv);
 739         }
 740         return rc;
 741 }
 742
 743 static void __exit cleanup_tis(void)
 744 {
 745         struct tpm_vendor_specific *i, *j;
 746         struct tpm_chip *chip;
 747         spin_lock(&tis_lock);
 748         list_for_each_entry_safe(i, j, &tis_chips, list) {
 749                 chip = to_tpm_chip(i);
 750                 tpm_remove_hardware(chip->dev);
 751                 iowrite32(~TPM_GLOBAL_INT_ENABLE &
 752                           ioread32(chip->vendor.iobase +
 753                                    TPM_INT_ENABLE(chip->vendor.
 754                                                   locality)),
 755                           chip->vendor.iobase +
 756                           TPM_INT_ENABLE(chip->vendor.locality));
 757                 release_locality(chip, chip->vendor.locality, 1);
 758                 if (chip->vendor.irq)
 759                         free_irq(chip->vendor.irq, chip);
 760                 iounmap(i->iobase);
 761                 list_del(&i->list);
 762         }
 763         spin_unlock(&tis_lock);
 764 #ifdef CONFIG_PNP
 765         if (!force) {
 766                 pnp_unregister_driver(&tis_pnp_driver);
 767                 return;
 768         }
 769 #endif
 770         platform_device_unregister(pdev);
 771         platform_driver_unregister(&tis_drv);
 772 }
 773
 774 module_init(init_tis);
 775 module_exit(cleanup_tis);
 776 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 777 MODULE_DESCRIPTION("TPM Driver");
 778 MODULE_VERSION("2.0");
 779 MODULE_LICENSE("GPL");