git.oblomov.eu Git - linux-2.6/blob - 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/interrupt.h>
  26 #include <linux/wait.h>
  27 #include "tpm.h"
  28
  29 #define TPM_HEADER_SIZE 10
  30
  31 enum tis_access {
  32         TPM_ACCESS_VALID = 0x80,
  33         TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
  34         TPM_ACCESS_REQUEST_PENDING = 0x04,
  35         TPM_ACCESS_REQUEST_USE = 0x02,
  36 };
  37
  38 enum tis_status {
  39         TPM_STS_VALID = 0x80,
  40         TPM_STS_COMMAND_READY = 0x40,
  41         TPM_STS_GO = 0x20,
  42         TPM_STS_DATA_AVAIL = 0x10,
  43         TPM_STS_DATA_EXPECT = 0x08,
  44 };
  45
  46 enum tis_int_flags {
  47         TPM_GLOBAL_INT_ENABLE = 0x80000000,
  48         TPM_INTF_BURST_COUNT_STATIC = 0x100,
  49         TPM_INTF_CMD_READY_INT = 0x080,
  50         TPM_INTF_INT_EDGE_FALLING = 0x040,
  51         TPM_INTF_INT_EDGE_RISING = 0x020,
  52         TPM_INTF_INT_LEVEL_LOW = 0x010,
  53         TPM_INTF_INT_LEVEL_HIGH = 0x008,
  54         TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
  55         TPM_INTF_STS_VALID_INT = 0x002,
  56         TPM_INTF_DATA_AVAIL_INT = 0x001,
  57 };
  58
  59 enum tis_defaults {
  60         TIS_MEM_BASE = 0xFED40000,
  61         TIS_MEM_LEN = 0x5000,
  62         TIS_SHORT_TIMEOUT = 750,        /* ms */
  63         TIS_LONG_TIMEOUT = 2000,        /* 2 sec */
  64 };
  65
  66 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 12))
  67 #define TPM_INT_ENABLE(l)               (0x0008 | ((l) << 12))
  68 #define TPM_INT_VECTOR(l)               (0x000C | ((l) << 12))
  69 #define TPM_INT_STATUS(l)               (0x0010 | ((l) << 12))
  70 #define TPM_INTF_CAPS(l)                (0x0014 | ((l) << 12))
  71 #define TPM_STS(l)                      (0x0018 | ((l) << 12))
  72 #define TPM_DATA_FIFO(l)                (0x0024 | ((l) << 12))
  73
  74 #define TPM_DID_VID(l)                  (0x0F00 | ((l) << 12))
  75 #define TPM_RID(l)                      (0x0F04 | ((l) << 12))
  76
  77 static LIST_HEAD(tis_chips);
  78 static DEFINE_SPINLOCK(tis_lock);
  79
  80 static int check_locality(struct tpm_chip *chip, int l)
  81 {
  82         if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
  83              (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
  84             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
  85                 return chip->vendor.locality = l;
  86
  87         return -1;
  88 }
  89
  90 static void release_locality(struct tpm_chip *chip, int l, int force)
  91 {
  92         if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
  93                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
  94             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
  95                 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
  96                          chip->vendor.iobase + TPM_ACCESS(l));
  97 }
  98
  99 static int request_locality(struct tpm_chip *chip, int l)
 100 {
 101         unsigned long stop;
 102         long rc;
 103
 104         if (check_locality(chip, l) >= 0)
 105                 return l;
 106
 107         iowrite8(TPM_ACCESS_REQUEST_USE,
 108                  chip->vendor.iobase + TPM_ACCESS(l));
 109
 110         if (chip->vendor.irq) {
 111                 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 112                                                       (check_locality
 113                                                        (chip, l) >= 0),
 114                                                       chip->vendor.timeout_a);
 115                 if (rc > 0)
 116                         return l;
 117
 118         } else {
 119                 /* wait for burstcount */
 120                 stop = jiffies + chip->vendor.timeout_a;
 121                 do {
 122                         if (check_locality(chip, l) >= 0)
 123                                 return l;
 124                         msleep(TPM_TIMEOUT);
 125                 }
 126                 while (time_before(jiffies, stop));
 127         }
 128         return -1;
 129 }
 130
 131 static u8 tpm_tis_status(struct tpm_chip *chip)
 132 {
 133         return ioread8(chip->vendor.iobase +
 134                        TPM_STS(chip->vendor.locality));
 135 }
 136
 137 static void tpm_tis_ready(struct tpm_chip *chip)
 138 {
 139         /* this causes the current command to be aborted */
 140         iowrite8(TPM_STS_COMMAND_READY,
 141                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 142 }
 143
 144 static int get_burstcount(struct tpm_chip *chip)
 145 {
 146         unsigned long stop;
 147         int burstcnt;
 148
 149         /* wait for burstcount */
 150         /* which timeout value, spec has 2 answers (c & d) */
 151         stop = jiffies + chip->vendor.timeout_d;
 152         do {
 153                 burstcnt = ioread8(chip->vendor.iobase +
 154                                    TPM_STS(chip->vendor.locality) + 1);
 155                 burstcnt += ioread8(chip->vendor.iobase +
 156                                     TPM_STS(chip->vendor.locality) +
 157                                     2) << 8;
 158                 if (burstcnt)
 159                         return burstcnt;
 160                 msleep(TPM_TIMEOUT);
 161         } while (time_before(jiffies, stop));
 162         return -EBUSY;
 163 }
 164
 165 static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 166                          wait_queue_head_t *queue)
 167 {
 168         unsigned long stop;
 169         long rc;
 170         u8 status;
 171
 172         /* check current status */
 173         status = tpm_tis_status(chip);
 174         if ((status & mask) == mask)
 175                 return 0;
 176
 177         if (chip->vendor.irq) {
 178                 rc = wait_event_interruptible_timeout(*queue,
 179                                                       ((tpm_tis_status
 180                                                         (chip) & mask) ==
 181                                                        mask), timeout);
 182                 if (rc > 0)
 183                         return 0;
 184         } else {
 185                 stop = jiffies + timeout;
 186                 do {
 187                         msleep(TPM_TIMEOUT);
 188                         status = tpm_tis_status(chip);
 189                         if ((status & mask) == mask)
 190                                 return 0;
 191                 } while (time_before(jiffies, stop));
 192         }
 193         return -ETIME;
 194 }
 195
 196 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 197 {
 198         int size = 0, burstcnt;
 199         while (size < count &&
 200                wait_for_stat(chip,
 201                              TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 202                              chip->vendor.timeout_c,
 203                              &chip->vendor.read_queue)
 204                == 0) {
 205                 burstcnt = get_burstcount(chip);
 206                 for (; burstcnt > 0 && size < count; burstcnt--)
 207                         buf[size++] = ioread8(chip->vendor.iobase +
 208                                               TPM_DATA_FIFO(chip->vendor.
 209                                                             locality));
 210         }
 211         return size;
 212 }
 213
 214 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 215 {
 216         int size = 0;
 217         int expected, status;
 218
 219         if (count < TPM_HEADER_SIZE) {
 220                 size = -EIO;
 221                 goto out;
 222         }
 223
 224         /* read first 10 bytes, including tag, paramsize, and result */
 225         if ((size =
 226              recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
 227                 dev_err(chip->dev, "Unable to read header\n");
 228                 goto out;
 229         }
 230
 231         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 232         if (expected > count) {
 233                 size = -EIO;
 234                 goto out;
 235         }
 236
 237         if ((size +=
 238              recv_data(chip, &buf[TPM_HEADER_SIZE],
 239                        expected - TPM_HEADER_SIZE)) < expected) {
 240                 dev_err(chip->dev, "Unable to read remainder of result\n");
 241                 size = -ETIME;
 242                 goto out;
 243         }
 244
 245         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 246                       &chip->vendor.int_queue);
 247         status = tpm_tis_status(chip);
 248         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 249                 dev_err(chip->dev, "Error left over data\n");
 250                 size = -EIO;
 251                 goto out;
 252         }
 253
 254 out:
 255         tpm_tis_ready(chip);
 256         release_locality(chip, chip->vendor.locality, 0);
 257         return size;
 258 }
 259
 260 /*
 261  * If interrupts are used (signaled by an irq set in the vendor structure)
 262  * tpm.c can skip polling for the data to be available as the interrupt is
 263  * waited for here
 264  */
 265 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 266 {
 267         int rc, status, burstcnt;
 268         size_t count = 0;
 269         u32 ordinal;
 270
 271         if (request_locality(chip, 0) < 0)
 272                 return -EBUSY;
 273
 274         status = tpm_tis_status(chip);
 275         if ((status & TPM_STS_COMMAND_READY) == 0) {
 276                 tpm_tis_ready(chip);
 277                 if (wait_for_stat
 278                     (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 279                      &chip->vendor.int_queue) < 0) {
 280                         rc = -ETIME;
 281                         goto out_err;
 282                 }
 283         }
 284
 285         while (count < len - 1) {
 286                 burstcnt = get_burstcount(chip);
 287                 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
 288                         iowrite8(buf[count], chip->vendor.iobase +
 289                                  TPM_DATA_FIFO(chip->vendor.locality));
 290                         count++;
 291                 }
 292
 293                 wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 294                               &chip->vendor.int_queue);
 295                 status = tpm_tis_status(chip);
 296                 if ((status & TPM_STS_DATA_EXPECT) == 0) {
 297                         rc = -EIO;
 298                         goto out_err;
 299                 }
 300         }
 301
 302         /* write last byte */
 303         iowrite8(buf[count],
 304                  chip->vendor.iobase +
 305                  TPM_DATA_FIFO(chip->vendor.locality));
 306         wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 307                       &chip->vendor.int_queue);
 308         status = tpm_tis_status(chip);
 309         if ((status & TPM_STS_DATA_EXPECT) != 0) {
 310                 rc = -EIO;
 311                 goto out_err;
 312         }
 313
 314         /* go and do it */
 315         iowrite8(TPM_STS_GO,
 316                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 317
 318         if (chip->vendor.irq) {
 319                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 320                 if (wait_for_stat
 321                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 322                      tpm_calc_ordinal_duration(chip, ordinal),
 323                      &chip->vendor.read_queue) < 0) {
 324                         rc = -ETIME;
 325                         goto out_err;
 326                 }
 327         }
 328         return len;
 329 out_err:
 330         tpm_tis_ready(chip);
 331         release_locality(chip, chip->vendor.locality, 0);
 332         return rc;
 333 }
 334
 335 static const struct file_operations tis_ops = {
 336         .owner = THIS_MODULE,
 337         .llseek = no_llseek,
 338         .open = tpm_open,
 339         .read = tpm_read,
 340         .write = tpm_write,
 341         .release = tpm_release,
 342 };
 343
 344 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 345 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 346 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 347 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 348 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 349 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 350                    NULL);
 351 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 352 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 353
 354 static struct attribute *tis_attrs[] = {
 355         &dev_attr_pubek.attr,
 356         &dev_attr_pcrs.attr,
 357         &dev_attr_enabled.attr,
 358         &dev_attr_active.attr,
 359         &dev_attr_owned.attr,
 360         &dev_attr_temp_deactivated.attr,
 361         &dev_attr_caps.attr,
 362         &dev_attr_cancel.attr, NULL,
 363 };
 364
 365 static struct attribute_group tis_attr_grp = {
 366         .attrs = tis_attrs
 367 };
 368
 369 static struct tpm_vendor_specific tpm_tis = {
 370         .status = tpm_tis_status,
 371         .recv = tpm_tis_recv,
 372         .send = tpm_tis_send,
 373         .cancel = tpm_tis_ready,
 374         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 375         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 376         .req_canceled = TPM_STS_COMMAND_READY,
 377         .attr_group = &tis_attr_grp,
 378         .miscdev = {
 379                     .fops = &tis_ops,},
 380 };
 381
 382 static irqreturn_t tis_int_probe(int irq, void *dev_id)
 383 {
 384         struct tpm_chip *chip = dev_id;
 385         u32 interrupt;
 386
 387         interrupt = ioread32(chip->vendor.iobase +
 388                              TPM_INT_STATUS(chip->vendor.locality));
 389
 390         if (interrupt == 0)
 391                 return IRQ_NONE;
 392
 393         chip->vendor.irq = irq;
 394
 395         /* Clear interrupts handled with TPM_EOI */
 396         iowrite32(interrupt,
 397                   chip->vendor.iobase +
 398                   TPM_INT_STATUS(chip->vendor.locality));
 399         return IRQ_HANDLED;
 400 }
 401
 402 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 403 {
 404         struct tpm_chip *chip = dev_id;
 405         u32 interrupt;
 406         int i;
 407
 408         interrupt = ioread32(chip->vendor.iobase +
 409                              TPM_INT_STATUS(chip->vendor.locality));
 410
 411         if (interrupt == 0)
 412                 return IRQ_NONE;
 413
 414         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 415                 wake_up_interruptible(&chip->vendor.read_queue);
 416         if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
 417                 for (i = 0; i < 5; i++)
 418                         if (check_locality(chip, i) >= 0)
 419                                 break;
 420         if (interrupt &
 421             (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
 422              TPM_INTF_CMD_READY_INT))
 423                 wake_up_interruptible(&chip->vendor.int_queue);
 424
 425         /* Clear interrupts handled with TPM_EOI */
 426         iowrite32(interrupt,
 427                   chip->vendor.iobase +
 428                   TPM_INT_STATUS(chip->vendor.locality));
 429         ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
 430         return IRQ_HANDLED;
 431 }
 432
 433 static int interrupts = 1;
 434 module_param(interrupts, bool, 0444);
 435 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 436
 437 static int tpm_tis_init(struct device *dev, resource_size_t start,
 438                         resource_size_t len, unsigned int irq)
 439 {
 440         u32 vendor, intfcaps, intmask;
 441         int rc, i;
 442         struct tpm_chip *chip;
 443
 444         if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
 445                 return -ENODEV;
 446
 447         chip->vendor.iobase = ioremap(start, len);
 448         if (!chip->vendor.iobase) {
 449                 rc = -EIO;
 450                 goto out_err;
 451         }
 452
 453         if (request_locality(chip, 0) != 0) {
 454                 rc = -ENODEV;
 455                 goto out_err;
 456         }
 457
 458         vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 459
 460         /* Default timeouts */
 461         chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 462         chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 463         chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 464         chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 465
 466         dev_info(dev,
 467                  "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 468                  vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 469
 470         /* Figure out the capabilities */
 471         intfcaps =
 472             ioread32(chip->vendor.iobase +
 473                      TPM_INTF_CAPS(chip->vendor.locality));
 474         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 475                 intfcaps);
 476         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 477                 dev_dbg(dev, "\tBurst Count Static\n");
 478         if (intfcaps & TPM_INTF_CMD_READY_INT)
 479                 dev_dbg(dev, "\tCommand Ready Int Support\n");
 480         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 481                 dev_dbg(dev, "\tInterrupt Edge Falling\n");
 482         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 483                 dev_dbg(dev, "\tInterrupt Edge Rising\n");
 484         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 485                 dev_dbg(dev, "\tInterrupt Level Low\n");
 486         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 487                 dev_dbg(dev, "\tInterrupt Level High\n");
 488         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 489                 dev_dbg(dev, "\tLocality Change Int Support\n");
 490         if (intfcaps & TPM_INTF_STS_VALID_INT)
 491                 dev_dbg(dev, "\tSts Valid Int Support\n");
 492         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 493                 dev_dbg(dev, "\tData Avail Int Support\n");
 494
 495         /* INTERRUPT Setup */
 496         init_waitqueue_head(&chip->vendor.read_queue);
 497         init_waitqueue_head(&chip->vendor.int_queue);
 498
 499         intmask =
 500             ioread32(chip->vendor.iobase +
 501                      TPM_INT_ENABLE(chip->vendor.locality));
 502
 503         intmask |= TPM_INTF_CMD_READY_INT
 504             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 505             | TPM_INTF_STS_VALID_INT;
 506
 507         iowrite32(intmask,
 508                   chip->vendor.iobase +
 509                   TPM_INT_ENABLE(chip->vendor.locality));
 510         if (interrupts)
 511                 chip->vendor.irq = irq;
 512         if (interrupts && !chip->vendor.irq) {
 513                 chip->vendor.irq =
 514                     ioread8(chip->vendor.iobase +
 515                             TPM_INT_VECTOR(chip->vendor.locality));
 516
 517                 for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
 518                         iowrite8(i, chip->vendor.iobase +
 519                                     TPM_INT_VECTOR(chip->vendor.locality));
 520                         if (request_irq
 521                             (i, tis_int_probe, IRQF_SHARED,
 522                              chip->vendor.miscdev.name, chip) != 0) {
 523                                 dev_info(chip->dev,
 524                                          "Unable to request irq: %d for probe\n",
 525                                          i);
 526                                 continue;
 527                         }
 528
 529                         /* Clear all existing */
 530                         iowrite32(ioread32
 531                                   (chip->vendor.iobase +
 532                                    TPM_INT_STATUS(chip->vendor.locality)),
 533                                   chip->vendor.iobase +
 534                                   TPM_INT_STATUS(chip->vendor.locality));
 535
 536                         /* Turn on */
 537                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 538                                   chip->vendor.iobase +
 539                                   TPM_INT_ENABLE(chip->vendor.locality));
 540
 541                         /* Generate Interrupts */
 542                         tpm_gen_interrupt(chip);
 543
 544                         /* Turn off */
 545                         iowrite32(intmask,
 546                                   chip->vendor.iobase +
 547                                   TPM_INT_ENABLE(chip->vendor.locality));
 548                         free_irq(i, chip);
 549                 }
 550         }
 551         if (chip->vendor.irq) {
 552                 iowrite8(chip->vendor.irq,
 553                          chip->vendor.iobase +
 554                          TPM_INT_VECTOR(chip->vendor.locality));
 555                 if (request_irq
 556                     (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
 557                      chip->vendor.miscdev.name, chip) != 0) {
 558                         dev_info(chip->dev,
 559                                  "Unable to request irq: %d for use\n",
 560                                  chip->vendor.irq);
 561                         chip->vendor.irq = 0;
 562                 } else {
 563                         /* Clear all existing */
 564                         iowrite32(ioread32
 565                                   (chip->vendor.iobase +
 566                                    TPM_INT_STATUS(chip->vendor.locality)),
 567                                   chip->vendor.iobase +
 568                                   TPM_INT_STATUS(chip->vendor.locality));
 569
 570                         /* Turn on */
 571                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 572                                   chip->vendor.iobase +
 573                                   TPM_INT_ENABLE(chip->vendor.locality));
 574                 }
 575         }
 576
 577         INIT_LIST_HEAD(&chip->vendor.list);
 578         spin_lock(&tis_lock);
 579         list_add(&chip->vendor.list, &tis_chips);
 580         spin_unlock(&tis_lock);
 581
 582         tpm_get_timeouts(chip);
 583         tpm_continue_selftest(chip);
 584
 585         return 0;
 586 out_err:
 587         if (chip->vendor.iobase)
 588                 iounmap(chip->vendor.iobase);
 589         tpm_remove_hardware(chip->dev);
 590         return rc;
 591 }
 592
 593 static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 594                                       const struct pnp_device_id *pnp_id)
 595 {
 596         resource_size_t start, len;
 597         unsigned int irq = 0;
 598
 599         start = pnp_mem_start(pnp_dev, 0);
 600         len = pnp_mem_len(pnp_dev, 0);
 601
 602         if (pnp_irq_valid(pnp_dev, 0))
 603                 irq = pnp_irq(pnp_dev, 0);
 604         else
 605                 interrupts = 0;
 606
 607         return tpm_tis_init(&pnp_dev->dev, start, len, irq);
 608 }
 609
 610 static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
 611 {
 612         return tpm_pm_suspend(&dev->dev, msg);
 613 }
 614
 615 static int tpm_tis_pnp_resume(struct pnp_dev *dev)
 616 {
 617         return tpm_pm_resume(&dev->dev);
 618 }
 619
 620 static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
 621         {"PNP0C31", 0},         /* TPM */
 622         {"ATM1200", 0},         /* Atmel */
 623         {"IFX0102", 0},         /* Infineon */
 624         {"BCM0101", 0},         /* Broadcom */
 625         {"NSC1200", 0},         /* National */
 626         /* Add new here */
 627         {"", 0},                /* User Specified */
 628         {"", 0}                 /* Terminator */
 629 };
 630
 631 static struct pnp_driver tis_pnp_driver = {
 632         .name = "tpm_tis",
 633         .id_table = tpm_pnp_tbl,
 634         .probe = tpm_tis_pnp_init,
 635         .suspend = tpm_tis_pnp_suspend,
 636         .resume = tpm_tis_pnp_resume,
 637 };
 638
 639 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 640 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 641                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 642 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 643
 644 static struct device_driver tis_drv = {
 645         .name = "tpm_tis",
 646         .bus = &platform_bus_type,
 647         .owner = THIS_MODULE,
 648         .suspend = tpm_pm_suspend,
 649         .resume = tpm_pm_resume,
 650 };
 651
 652 static struct platform_device *pdev;
 653
 654 static int force;
 655 module_param(force, bool, 0444);
 656 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 657 static int __init init_tis(void)
 658 {
 659         int rc;
 660
 661         if (force) {
 662                 rc = driver_register(&tis_drv);
 663                 if (rc < 0)
 664                         return rc;
 665                 if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
 666                         return PTR_ERR(pdev);
 667                 if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
 668                         platform_device_unregister(pdev);
 669                         driver_unregister(&tis_drv);
 670                 }
 671                 return rc;
 672         }
 673
 674         return pnp_register_driver(&tis_pnp_driver);
 675 }
 676
 677 static void __exit cleanup_tis(void)
 678 {
 679         struct tpm_vendor_specific *i, *j;
 680         struct tpm_chip *chip;
 681         spin_lock(&tis_lock);
 682         list_for_each_entry_safe(i, j, &tis_chips, list) {
 683                 chip = to_tpm_chip(i);
 684                 iowrite32(~TPM_GLOBAL_INT_ENABLE &
 685                           ioread32(chip->vendor.iobase +
 686                                    TPM_INT_ENABLE(chip->vendor.
 687                                                   locality)),
 688                           chip->vendor.iobase +
 689                           TPM_INT_ENABLE(chip->vendor.locality));
 690                 release_locality(chip, chip->vendor.locality, 1);
 691                 if (chip->vendor.irq)
 692                         free_irq(chip->vendor.irq, chip);
 693                 iounmap(i->iobase);
 694                 list_del(&i->list);
 695                 tpm_remove_hardware(chip->dev);
 696         }
 697         spin_unlock(&tis_lock);
 698         if (force) {
 699                 platform_device_unregister(pdev);
 700                 driver_unregister(&tis_drv);
 701         } else
 702                 pnp_unregister_driver(&tis_pnp_driver);
 703 }
 704
 705 module_init(init_tis);
 706 module_exit(cleanup_tis);
 707 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 708 MODULE_DESCRIPTION("TPM Driver");
 709 MODULE_VERSION("2.0");
 710 MODULE_LICENSE("GPL");