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 enum tis_access {
  33         TPM_ACCESS_VALID = 0x80,
  34         TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
  35         TPM_ACCESS_REQUEST_PENDING = 0x04,
  36         TPM_ACCESS_REQUEST_USE = 0x02,
  37 };
  38
  39 enum tis_status {
  40         TPM_STS_VALID = 0x80,
  41         TPM_STS_COMMAND_READY = 0x40,
  42         TPM_STS_GO = 0x20,
  43         TPM_STS_DATA_AVAIL = 0x10,
  44         TPM_STS_DATA_EXPECT = 0x08,
  45 };
  46
  47 enum tis_int_flags {
  48         TPM_GLOBAL_INT_ENABLE = 0x80000000,
  49         TPM_INTF_BURST_COUNT_STATIC = 0x100,
  50         TPM_INTF_CMD_READY_INT = 0x080,
  51         TPM_INTF_INT_EDGE_FALLING = 0x040,
  52         TPM_INTF_INT_EDGE_RISING = 0x020,
  53         TPM_INTF_INT_LEVEL_LOW = 0x010,
  54         TPM_INTF_INT_LEVEL_HIGH = 0x008,
  55         TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
  56         TPM_INTF_STS_VALID_INT = 0x002,
  57         TPM_INTF_DATA_AVAIL_INT = 0x001,
  58 };
  59
  60 enum tis_defaults {
  61         TIS_MEM_BASE = 0xFED40000,
  62         TIS_MEM_LEN = 0x5000,
  63         TIS_SHORT_TIMEOUT = 750,        /* ms */
  64         TIS_LONG_TIMEOUT = 2000,        /* 2 sec */
  65 };
  66
  67 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 12))
  68 #define TPM_INT_ENABLE(l)               (0x0008 | ((l) << 12))
  69 #define TPM_INT_VECTOR(l)               (0x000C | ((l) << 12))
  70 #define TPM_INT_STATUS(l)               (0x0010 | ((l) << 12))
  71 #define TPM_INTF_CAPS(l)                (0x0014 | ((l) << 12))
  72 #define TPM_STS(l)                      (0x0018 | ((l) << 12))
  73 #define TPM_DATA_FIFO(l)                (0x0024 | ((l) << 12))
  74
  75 #define TPM_DID_VID(l)                  (0x0F00 | ((l) << 12))
  76 #define TPM_RID(l)                      (0x0F04 | ((l) << 12))
  77
  78 static LIST_HEAD(tis_chips);
  79 static DEFINE_MUTEX(tis_lock);
  80
  81 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
  82 static int is_itpm(struct pnp_dev *dev)
  83 {
  84         struct acpi_device *acpi = pnp_acpi_device(dev);
  85         struct acpi_hardware_id *id;
  86
  87         if (!acpi)
  88                 return 0;
  89
  90         list_for_each_entry(id, &acpi->pnp.ids, list) {
  91                 if (!strcmp("INTC0102", id->id))
  92                         return 1;
  93         }
  94
  95         return 0;
  96 }
  97 #else
  98 static inline int is_itpm(struct pnp_dev *dev)
  99 {
 100         return 0;
 101 }
 102 #endif
 103
 104 /* Before we attempt to access the TPM we must see that the valid bit is set.
 105  * The specification says that this bit is 0 at reset and remains 0 until the
 106  * 'TPM has gone through its self test and initialization and has established
 107  * correct values in the other bits.' */
 108 static int wait_startup(struct tpm_chip *chip, int l)
 109 {
 110         unsigned long stop = jiffies + chip->vendor.timeout_a;
 111         do {
 112                 if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 113                     TPM_ACCESS_VALID)
 114                         return 0;
 115                 msleep(TPM_TIMEOUT);
 116         } while (time_before(jiffies, stop));
 117         return -1;
 118 }
 119
 120 static int check_locality(struct tpm_chip *chip, int l)
 121 {
 122         if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 123              (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 124             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
 125                 return chip->vendor.locality = l;
 126
 127         return -1;
 128 }
 129
 130 static void release_locality(struct tpm_chip *chip, int l, int force)
 131 {
 132         if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 133                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
 134             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
 135                 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
 136                          chip->vendor.iobase + TPM_ACCESS(l));
 137 }
 138
 139 static int request_locality(struct tpm_chip *chip, int l)
 140 {
 141         unsigned long stop, timeout;
 142         long rc;
 143
 144         if (check_locality(chip, l) >= 0)
 145                 return l;
 146
 147         iowrite8(TPM_ACCESS_REQUEST_USE,
 148                  chip->vendor.iobase + TPM_ACCESS(l));
 149
 150         stop = jiffies + chip->vendor.timeout_a;
 151
 152         if (chip->vendor.irq) {
 153 again:
 154                 timeout = stop - jiffies;
 155                 if ((long)timeout <= 0)
 156                         return -1;
 157                 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 158                                                       (check_locality
 159                                                        (chip, l) >= 0),
 160                                                       timeout);
 161                 if (rc > 0)
 162                         return l;
 163                 if (rc == -ERESTARTSYS && freezing(current)) {
 164                         clear_thread_flag(TIF_SIGPENDING);
 165                         goto again;
 166                 }
 167         } else {
 168                 /* wait for burstcount */
 169                 do {
 170                         if (check_locality(chip, l) >= 0)
 171                                 return l;
 172                         msleep(TPM_TIMEOUT);
 173                 }
 174                 while (time_before(jiffies, stop));
 175         }
 176         return -1;
 177 }
 178
 179 static u8 tpm_tis_status(struct tpm_chip *chip)
 180 {
 181         return ioread8(chip->vendor.iobase +
 182                        TPM_STS(chip->vendor.locality));
 183 }
 184
 185 static void tpm_tis_ready(struct tpm_chip *chip)
 186 {
 187         /* this causes the current command to be aborted */
 188         iowrite8(TPM_STS_COMMAND_READY,
 189                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 190 }
 191
 192 static int get_burstcount(struct tpm_chip *chip)
 193 {
 194         unsigned long stop;
 195         int burstcnt;
 196
 197         /* wait for burstcount */
 198         /* which timeout value, spec has 2 answers (c & d) */
 199         stop = jiffies + chip->vendor.timeout_d;
 200         do {
 201                 burstcnt = ioread8(chip->vendor.iobase +
 202                                    TPM_STS(chip->vendor.locality) + 1);
 203                 burstcnt += ioread8(chip->vendor.iobase +
 204                                     TPM_STS(chip->vendor.locality) +
 205                                     2) << 8;
 206                 if (burstcnt)
 207                         return burstcnt;
 208                 msleep(TPM_TIMEOUT);
 209         } while (time_before(jiffies, stop));
 210         return -EBUSY;
 211 }
 212
 213 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 214 {
 215         int size = 0, burstcnt;
 216         while (size < count &&
 217                wait_for_tpm_stat(chip,
 218                                  TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 219                                  chip->vendor.timeout_c,
 220                                  &chip->vendor.read_queue, true)
 221                == 0) {
 222                 burstcnt = get_burstcount(chip);
 223                 for (; burstcnt > 0 && size < count; burstcnt--)
 224                         buf[size++] = ioread8(chip->vendor.iobase +
 225                                               TPM_DATA_FIFO(chip->vendor.
 226                                                             locality));
 227         }
 228         return size;
 229 }
 230
 231 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 232 {
 233         int size = 0;
 234         int expected, status;
 235
 236         if (count < TPM_HEADER_SIZE) {
 237                 size = -EIO;
 238                 goto out;
 239         }
 240
 241         /* read first 10 bytes, including tag, paramsize, and result */
 242         if ((size =
 243              recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
 244                 dev_err(chip->dev, "Unable to read header\n");
 245                 goto out;
 246         }
 247
 248         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 249         if (expected > count) {
 250                 size = -EIO;
 251                 goto out;
 252         }
 253
 254         if ((size +=
 255              recv_data(chip, &buf[TPM_HEADER_SIZE],
 256                        expected - TPM_HEADER_SIZE)) < expected) {
 257                 dev_err(chip->dev, "Unable to read remainder of result\n");
 258                 size = -ETIME;
 259                 goto out;
 260         }
 261
 262         wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 263                           &chip->vendor.int_queue, false);
 264         status = tpm_tis_status(chip);
 265         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 266                 dev_err(chip->dev, "Error left over data\n");
 267                 size = -EIO;
 268                 goto out;
 269         }
 270
 271 out:
 272         tpm_tis_ready(chip);
 273         release_locality(chip, chip->vendor.locality, 0);
 274         return size;
 275 }
 276
 277 static bool itpm;
 278 module_param(itpm, bool, 0444);
 279 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
 280
 281 /*
 282  * If interrupts are used (signaled by an irq set in the vendor structure)
 283  * tpm.c can skip polling for the data to be available as the interrupt is
 284  * waited for here
 285  */
 286 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 287 {
 288         int rc, status, burstcnt;
 289         size_t count = 0;
 290
 291         if (request_locality(chip, 0) < 0)
 292                 return -EBUSY;
 293
 294         status = tpm_tis_status(chip);
 295         if ((status & TPM_STS_COMMAND_READY) == 0) {
 296                 tpm_tis_ready(chip);
 297                 if (wait_for_tpm_stat
 298                     (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 299                      &chip->vendor.int_queue, false) < 0) {
 300                         rc = -ETIME;
 301                         goto out_err;
 302                 }
 303         }
 304
 305         while (count < len - 1) {
 306                 burstcnt = get_burstcount(chip);
 307                 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
 308                         iowrite8(buf[count], chip->vendor.iobase +
 309                                  TPM_DATA_FIFO(chip->vendor.locality));
 310                         count++;
 311                 }
 312
 313                 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 314                                   &chip->vendor.int_queue, false);
 315                 status = tpm_tis_status(chip);
 316                 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
 317                         rc = -EIO;
 318                         goto out_err;
 319                 }
 320         }
 321
 322         /* write last byte */
 323         iowrite8(buf[count],
 324                  chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
 325         wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 326                           &chip->vendor.int_queue, false);
 327         status = tpm_tis_status(chip);
 328         if ((status & TPM_STS_DATA_EXPECT) != 0) {
 329                 rc = -EIO;
 330                 goto out_err;
 331         }
 332
 333         return 0;
 334
 335 out_err:
 336         tpm_tis_ready(chip);
 337         release_locality(chip, chip->vendor.locality, 0);
 338         return rc;
 339 }
 340
 341 /*
 342  * If interrupts are used (signaled by an irq set in the vendor structure)
 343  * tpm.c can skip polling for the data to be available as the interrupt is
 344  * waited for here
 345  */
 346 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 347 {
 348         int rc;
 349         u32 ordinal;
 350
 351         rc = tpm_tis_send_data(chip, buf, len);
 352         if (rc < 0)
 353                 return rc;
 354
 355         /* go and do it */
 356         iowrite8(TPM_STS_GO,
 357                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 358
 359         if (chip->vendor.irq) {
 360                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 361                 if (wait_for_tpm_stat
 362                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 363                      tpm_calc_ordinal_duration(chip, ordinal),
 364                      &chip->vendor.read_queue, false) < 0) {
 365                         rc = -ETIME;
 366                         goto out_err;
 367                 }
 368         }
 369         return len;
 370 out_err:
 371         tpm_tis_ready(chip);
 372         release_locality(chip, chip->vendor.locality, 0);
 373         return rc;
 374 }
 375
 376 /*
 377  * Early probing for iTPM with STS_DATA_EXPECT flaw.
 378  * Try sending command without itpm flag set and if that
 379  * fails, repeat with itpm flag set.
 380  */
 381 static int probe_itpm(struct tpm_chip *chip)
 382 {
 383         int rc = 0;
 384         u8 cmd_getticks[] = {
 385                 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
 386                 0x00, 0x00, 0x00, 0xf1
 387         };
 388         size_t len = sizeof(cmd_getticks);
 389         bool rem_itpm = itpm;
 390         u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
 391
 392         /* probe only iTPMS */
 393         if (vendor != TPM_VID_INTEL)
 394                 return 0;
 395
 396         itpm = false;
 397
 398         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 399         if (rc == 0)
 400                 goto out;
 401
 402         tpm_tis_ready(chip);
 403         release_locality(chip, chip->vendor.locality, 0);
 404
 405         itpm = true;
 406
 407         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 408         if (rc == 0) {
 409                 dev_info(chip->dev, "Detected an iTPM.\n");
 410                 rc = 1;
 411         } else
 412                 rc = -EFAULT;
 413
 414 out:
 415         itpm = rem_itpm;
 416         tpm_tis_ready(chip);
 417         release_locality(chip, chip->vendor.locality, 0);
 418
 419         return rc;
 420 }
 421
 422 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
 423 {
 424         switch (chip->vendor.manufacturer_id) {
 425         case TPM_VID_WINBOND:
 426                 return ((status == TPM_STS_VALID) ||
 427                         (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
 428         case TPM_VID_STM:
 429                 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
 430         default:
 431                 return (status == TPM_STS_COMMAND_READY);
 432         }
 433 }
 434
 435 static const struct file_operations tis_ops = {
 436         .owner = THIS_MODULE,
 437         .llseek = no_llseek,
 438         .open = tpm_open,
 439         .read = tpm_read,
 440         .write = tpm_write,
 441         .release = tpm_release,
 442 };
 443
 444 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 445 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 446 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 447 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 448 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 449 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 450                    NULL);
 451 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
 452 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 453 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
 454 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 455
 456 static struct attribute *tis_attrs[] = {
 457         &dev_attr_pubek.attr,
 458         &dev_attr_pcrs.attr,
 459         &dev_attr_enabled.attr,
 460         &dev_attr_active.attr,
 461         &dev_attr_owned.attr,
 462         &dev_attr_temp_deactivated.attr,
 463         &dev_attr_caps.attr,
 464         &dev_attr_cancel.attr,
 465         &dev_attr_durations.attr,
 466         &dev_attr_timeouts.attr, NULL,
 467 };
 468
 469 static struct attribute_group tis_attr_grp = {
 470         .attrs = tis_attrs
 471 };
 472
 473 static struct tpm_vendor_specific tpm_tis = {
 474         .status = tpm_tis_status,
 475         .recv = tpm_tis_recv,
 476         .send = tpm_tis_send,
 477         .cancel = tpm_tis_ready,
 478         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 479         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 480         .req_canceled = tpm_tis_req_canceled,
 481         .attr_group = &tis_attr_grp,
 482         .miscdev = {
 483                     .fops = &tis_ops,},
 484 };
 485
 486 static irqreturn_t tis_int_probe(int irq, void *dev_id)
 487 {
 488         struct tpm_chip *chip = dev_id;
 489         u32 interrupt;
 490
 491         interrupt = ioread32(chip->vendor.iobase +
 492                              TPM_INT_STATUS(chip->vendor.locality));
 493
 494         if (interrupt == 0)
 495                 return IRQ_NONE;
 496
 497         chip->vendor.probed_irq = irq;
 498
 499         /* Clear interrupts handled with TPM_EOI */
 500         iowrite32(interrupt,
 501                   chip->vendor.iobase +
 502                   TPM_INT_STATUS(chip->vendor.locality));
 503         return IRQ_HANDLED;
 504 }
 505
 506 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 507 {
 508         struct tpm_chip *chip = dev_id;
 509         u32 interrupt;
 510         int i;
 511
 512         interrupt = ioread32(chip->vendor.iobase +
 513                              TPM_INT_STATUS(chip->vendor.locality));
 514
 515         if (interrupt == 0)
 516                 return IRQ_NONE;
 517
 518         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 519                 wake_up_interruptible(&chip->vendor.read_queue);
 520         if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
 521                 for (i = 0; i < 5; i++)
 522                         if (check_locality(chip, i) >= 0)
 523                                 break;
 524         if (interrupt &
 525             (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
 526              TPM_INTF_CMD_READY_INT))
 527                 wake_up_interruptible(&chip->vendor.int_queue);
 528
 529         /* Clear interrupts handled with TPM_EOI */
 530         iowrite32(interrupt,
 531                   chip->vendor.iobase +
 532                   TPM_INT_STATUS(chip->vendor.locality));
 533         ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
 534         return IRQ_HANDLED;
 535 }
 536
 537 static bool interrupts = true;
 538 module_param(interrupts, bool, 0444);
 539 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 540
 541 static int tpm_tis_init(struct device *dev, resource_size_t start,
 542                         resource_size_t len, unsigned int irq)
 543 {
 544         u32 vendor, intfcaps, intmask;
 545         int rc, i, irq_s, irq_e, probe;
 546         struct tpm_chip *chip;
 547
 548         if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
 549                 return -ENODEV;
 550
 551         chip->vendor.iobase = ioremap(start, len);
 552         if (!chip->vendor.iobase) {
 553                 rc = -EIO;
 554                 goto out_err;
 555         }
 556
 557         /* Default timeouts */
 558         chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 559         chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 560         chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 561         chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 562
 563         if (wait_startup(chip, 0) != 0) {
 564                 rc = -ENODEV;
 565                 goto out_err;
 566         }
 567
 568         if (request_locality(chip, 0) != 0) {
 569                 rc = -ENODEV;
 570                 goto out_err;
 571         }
 572
 573         vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 574         chip->vendor.manufacturer_id = vendor;
 575
 576         dev_info(dev,
 577                  "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 578                  vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 579
 580         if (!itpm) {
 581                 probe = probe_itpm(chip);
 582                 if (probe < 0) {
 583                         rc = -ENODEV;
 584                         goto out_err;
 585                 }
 586                 itpm = !!probe;
 587         }
 588
 589         if (itpm)
 590                 dev_info(dev, "Intel iTPM workaround enabled\n");
 591
 592
 593         /* Figure out the capabilities */
 594         intfcaps =
 595             ioread32(chip->vendor.iobase +
 596                      TPM_INTF_CAPS(chip->vendor.locality));
 597         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 598                 intfcaps);
 599         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 600                 dev_dbg(dev, "\tBurst Count Static\n");
 601         if (intfcaps & TPM_INTF_CMD_READY_INT)
 602                 dev_dbg(dev, "\tCommand Ready Int Support\n");
 603         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 604                 dev_dbg(dev, "\tInterrupt Edge Falling\n");
 605         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 606                 dev_dbg(dev, "\tInterrupt Edge Rising\n");
 607         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 608                 dev_dbg(dev, "\tInterrupt Level Low\n");
 609         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 610                 dev_dbg(dev, "\tInterrupt Level High\n");
 611         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 612                 dev_dbg(dev, "\tLocality Change Int Support\n");
 613         if (intfcaps & TPM_INTF_STS_VALID_INT)
 614                 dev_dbg(dev, "\tSts Valid Int Support\n");
 615         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 616                 dev_dbg(dev, "\tData Avail Int Support\n");
 617
 618         /* get the timeouts before testing for irqs */
 619         if (tpm_get_timeouts(chip)) {
 620                 dev_err(dev, "Could not get TPM timeouts and durations\n");
 621                 rc = -ENODEV;
 622                 goto out_err;
 623         }
 624
 625         if (tpm_do_selftest(chip)) {
 626                 dev_err(dev, "TPM self test failed\n");
 627                 rc = -ENODEV;
 628                 goto out_err;
 629         }
 630
 631         /* INTERRUPT Setup */
 632         init_waitqueue_head(&chip->vendor.read_queue);
 633         init_waitqueue_head(&chip->vendor.int_queue);
 634
 635         intmask =
 636             ioread32(chip->vendor.iobase +
 637                      TPM_INT_ENABLE(chip->vendor.locality));
 638
 639         intmask |= TPM_INTF_CMD_READY_INT
 640             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 641             | TPM_INTF_STS_VALID_INT;
 642
 643         iowrite32(intmask,
 644                   chip->vendor.iobase +
 645                   TPM_INT_ENABLE(chip->vendor.locality));
 646         if (interrupts)
 647                 chip->vendor.irq = irq;
 648         if (interrupts && !chip->vendor.irq) {
 649                 irq_s =
 650                     ioread8(chip->vendor.iobase +
 651                             TPM_INT_VECTOR(chip->vendor.locality));
 652                 if (irq_s) {
 653                         irq_e = irq_s;
 654                 } else {
 655                         irq_s = 3;
 656                         irq_e = 15;
 657                 }
 658
 659                 for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
 660                         iowrite8(i, chip->vendor.iobase +
 661                                  TPM_INT_VECTOR(chip->vendor.locality));
 662                         if (request_irq
 663                             (i, tis_int_probe, IRQF_SHARED,
 664                              chip->vendor.miscdev.name, chip) != 0) {
 665                                 dev_info(chip->dev,
 666                                          "Unable to request irq: %d for probe\n",
 667                                          i);
 668                                 continue;
 669                         }
 670
 671                         /* Clear all existing */
 672                         iowrite32(ioread32
 673                                   (chip->vendor.iobase +
 674                                    TPM_INT_STATUS(chip->vendor.locality)),
 675                                   chip->vendor.iobase +
 676                                   TPM_INT_STATUS(chip->vendor.locality));
 677
 678                         /* Turn on */
 679                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 680                                   chip->vendor.iobase +
 681                                   TPM_INT_ENABLE(chip->vendor.locality));
 682
 683                         chip->vendor.probed_irq = 0;
 684
 685                         /* Generate Interrupts */
 686                         tpm_gen_interrupt(chip);
 687
 688                         chip->vendor.irq = chip->vendor.probed_irq;
 689
 690                         /* free_irq will call into tis_int_probe;
 691                            clear all irqs we haven't seen while doing
 692                            tpm_gen_interrupt */
 693                         iowrite32(ioread32
 694                                   (chip->vendor.iobase +
 695                                    TPM_INT_STATUS(chip->vendor.locality)),
 696                                   chip->vendor.iobase +
 697                                   TPM_INT_STATUS(chip->vendor.locality));
 698
 699                         /* Turn off */
 700                         iowrite32(intmask,
 701                                   chip->vendor.iobase +
 702                                   TPM_INT_ENABLE(chip->vendor.locality));
 703                         free_irq(i, chip);
 704                 }
 705         }
 706         if (chip->vendor.irq) {
 707                 iowrite8(chip->vendor.irq,
 708                          chip->vendor.iobase +
 709                          TPM_INT_VECTOR(chip->vendor.locality));
 710                 if (request_irq
 711                     (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
 712                      chip->vendor.miscdev.name, chip) != 0) {
 713                         dev_info(chip->dev,
 714                                  "Unable to request irq: %d for use\n",
 715                                  chip->vendor.irq);
 716                         chip->vendor.irq = 0;
 717                 } else {
 718                         /* Clear all existing */
 719                         iowrite32(ioread32
 720                                   (chip->vendor.iobase +
 721                                    TPM_INT_STATUS(chip->vendor.locality)),
 722                                   chip->vendor.iobase +
 723                                   TPM_INT_STATUS(chip->vendor.locality));
 724
 725                         /* Turn on */
 726                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 727                                   chip->vendor.iobase +
 728                                   TPM_INT_ENABLE(chip->vendor.locality));
 729                 }
 730         }
 731
 732         INIT_LIST_HEAD(&chip->vendor.list);
 733         mutex_lock(&tis_lock);
 734         list_add(&chip->vendor.list, &tis_chips);
 735         mutex_unlock(&tis_lock);
 736
 737
 738         return 0;
 739 out_err:
 740         if (chip->vendor.iobase)
 741                 iounmap(chip->vendor.iobase);
 742         tpm_remove_hardware(chip->dev);
 743         return rc;
 744 }
 745
 746 #if defined(CONFIG_PNP) || defined(CONFIG_PM_SLEEP)
 747 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
 748 {
 749         u32 intmask;
 750
 751         /* reenable interrupts that device may have lost or
 752            BIOS/firmware may have disabled */
 753         iowrite8(chip->vendor.irq, chip->vendor.iobase +
 754                  TPM_INT_VECTOR(chip->vendor.locality));
 755
 756         intmask =
 757             ioread32(chip->vendor.iobase +
 758                      TPM_INT_ENABLE(chip->vendor.locality));
 759
 760         intmask |= TPM_INTF_CMD_READY_INT
 761             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 762             | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
 763
 764         iowrite32(intmask,
 765                   chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
 766 }
 767 #endif
 768
 769 #ifdef CONFIG_PM_SLEEP
 770 static int tpm_tis_resume(struct device *dev)
 771 {
 772         struct tpm_chip *chip = dev_get_drvdata(dev);
 773         int ret;
 774
 775         if (chip->vendor.irq)
 776                 tpm_tis_reenable_interrupts(chip);
 777
 778         ret = tpm_pm_resume(dev);
 779         if (!ret)
 780                 tpm_do_selftest(chip);
 781
 782         return ret;
 783 }
 784 #endif
 785
 786 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
 787
 788 #ifdef CONFIG_PNP
 789 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 790                                       const struct pnp_device_id *pnp_id)
 791 {
 792         resource_size_t start, len;
 793         unsigned int irq = 0;
 794
 795         start = pnp_mem_start(pnp_dev, 0);
 796         len = pnp_mem_len(pnp_dev, 0);
 797
 798         if (pnp_irq_valid(pnp_dev, 0))
 799                 irq = pnp_irq(pnp_dev, 0);
 800         else
 801                 interrupts = false;
 802
 803         if (is_itpm(pnp_dev))
 804                 itpm = true;
 805
 806         return tpm_tis_init(&pnp_dev->dev, start, len, irq);
 807 }
 808
 809 static struct pnp_device_id tpm_pnp_tbl[] = {
 810         {"PNP0C31", 0},         /* TPM */
 811         {"ATM1200", 0},         /* Atmel */
 812         {"IFX0102", 0},         /* Infineon */
 813         {"BCM0101", 0},         /* Broadcom */
 814         {"BCM0102", 0},         /* Broadcom */
 815         {"NSC1200", 0},         /* National */
 816         {"ICO0102", 0},         /* Intel */
 817         /* Add new here */
 818         {"", 0},                /* User Specified */
 819         {"", 0}                 /* Terminator */
 820 };
 821 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
 822
 823 static void tpm_tis_pnp_remove(struct pnp_dev *dev)
 824 {
 825         struct tpm_chip *chip = pnp_get_drvdata(dev);
 826
 827         tpm_dev_vendor_release(chip);
 828
 829         kfree(chip);
 830 }
 831
 832
 833 static struct pnp_driver tis_pnp_driver = {
 834         .name = "tpm_tis",
 835         .id_table = tpm_pnp_tbl,
 836         .probe = tpm_tis_pnp_init,
 837         .remove = tpm_tis_pnp_remove,
 838 #ifdef CONFIG_PM_SLEEP
 839         .driver = {
 840                 .pm = &tpm_tis_pm,
 841         },
 842 #endif
 843 };
 844
 845 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 846 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 847                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 848 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 849 #endif
 850
 851 static struct platform_driver tis_drv = {
 852         .driver = {
 853                 .name = "tpm_tis",
 854                 .owner          = THIS_MODULE,
 855                 .pm             = &tpm_tis_pm,
 856         },
 857 };
 858
 859 static struct platform_device *pdev;
 860
 861 static bool force;
 862 module_param(force, bool, 0444);
 863 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 864 static int __init init_tis(void)
 865 {
 866         int rc;
 867 #ifdef CONFIG_PNP
 868         if (!force)
 869                 return pnp_register_driver(&tis_pnp_driver);
 870 #endif
 871
 872         rc = platform_driver_register(&tis_drv);
 873         if (rc < 0)
 874                 return rc;
 875         pdev = platform_device_register_simple("tpm_tis", -1, NULL, 0);
 876         if (IS_ERR(pdev)) {
 877                 rc = PTR_ERR(pdev);
 878                 goto err_dev;
 879         }
 880         rc = tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0);
 881         if (rc)
 882                 goto err_init;
 883         return 0;
 884 err_init:
 885         platform_device_unregister(pdev);
 886 err_dev:
 887         platform_driver_unregister(&tis_drv);
 888         return rc;
 889 }
 890
 891 static void __exit cleanup_tis(void)
 892 {
 893         struct tpm_vendor_specific *i, *j;
 894         struct tpm_chip *chip;
 895         mutex_lock(&tis_lock);
 896         list_for_each_entry_safe(i, j, &tis_chips, list) {
 897                 chip = to_tpm_chip(i);
 898                 tpm_remove_hardware(chip->dev);
 899                 iowrite32(~TPM_GLOBAL_INT_ENABLE &
 900                           ioread32(chip->vendor.iobase +
 901                                    TPM_INT_ENABLE(chip->vendor.
 902                                                   locality)),
 903                           chip->vendor.iobase +
 904                           TPM_INT_ENABLE(chip->vendor.locality));
 905                 release_locality(chip, chip->vendor.locality, 1);
 906                 if (chip->vendor.irq)
 907                         free_irq(chip->vendor.irq, chip);
 908                 iounmap(i->iobase);
 909                 list_del(&i->list);
 910         }
 911         mutex_unlock(&tis_lock);
 912 #ifdef CONFIG_PNP
 913         if (!force) {
 914                 pnp_unregister_driver(&tis_pnp_driver);
 915                 return;
 916         }
 917 #endif
 918         platform_device_unregister(pdev);
 919         platform_driver_unregister(&tis_drv);
 920 }
 921
 922 module_init(init_tis);
 923 module_exit(cleanup_tis);
 924 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 925 MODULE_DESCRIPTION("TPM Driver");
 926 MODULE_VERSION("2.0");
 927 MODULE_LICENSE("GPL");