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_SPINLOCK(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         list_for_each_entry(id, &acpi->pnp.ids, list) {
  88                 if (!strcmp("INTC0102", id->id))
  89                         return 1;
  90         }
  91
  92         return 0;
  93 }
  94 #else
  95 static inline int is_itpm(struct pnp_dev *dev)
  96 {
  97         return 0;
  98 }
  99 #endif
 100
 101 static int check_locality(struct tpm_chip *chip, int l)
 102 {
 103         if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 104              (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
 105             (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
 106                 return chip->vendor.locality = l;
 107
 108         return -1;
 109 }
 110
 111 static void release_locality(struct tpm_chip *chip, int l, int force)
 112 {
 113         if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
 114                       (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
 115             (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
 116                 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
 117                          chip->vendor.iobase + TPM_ACCESS(l));
 118 }
 119
 120 static int request_locality(struct tpm_chip *chip, int l)
 121 {
 122         unsigned long stop, timeout;
 123         long rc;
 124
 125         if (check_locality(chip, l) >= 0)
 126                 return l;
 127
 128         iowrite8(TPM_ACCESS_REQUEST_USE,
 129                  chip->vendor.iobase + TPM_ACCESS(l));
 130
 131         stop = jiffies + chip->vendor.timeout_a;
 132
 133         if (chip->vendor.irq) {
 134 again:
 135                 timeout = stop - jiffies;
 136                 if ((long)timeout <= 0)
 137                         return -1;
 138                 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 139                                                       (check_locality
 140                                                        (chip, l) >= 0),
 141                                                       timeout);
 142                 if (rc > 0)
 143                         return l;
 144                 if (rc == -ERESTARTSYS && freezing(current)) {
 145                         clear_thread_flag(TIF_SIGPENDING);
 146                         goto again;
 147                 }
 148         } else {
 149                 /* wait for burstcount */
 150                 do {
 151                         if (check_locality(chip, l) >= 0)
 152                                 return l;
 153                         msleep(TPM_TIMEOUT);
 154                 }
 155                 while (time_before(jiffies, stop));
 156         }
 157         return -1;
 158 }
 159
 160 static u8 tpm_tis_status(struct tpm_chip *chip)
 161 {
 162         return ioread8(chip->vendor.iobase +
 163                        TPM_STS(chip->vendor.locality));
 164 }
 165
 166 static void tpm_tis_ready(struct tpm_chip *chip)
 167 {
 168         /* this causes the current command to be aborted */
 169         iowrite8(TPM_STS_COMMAND_READY,
 170                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 171 }
 172
 173 static int get_burstcount(struct tpm_chip *chip)
 174 {
 175         unsigned long stop;
 176         int burstcnt;
 177
 178         /* wait for burstcount */
 179         /* which timeout value, spec has 2 answers (c & d) */
 180         stop = jiffies + chip->vendor.timeout_d;
 181         do {
 182                 burstcnt = ioread8(chip->vendor.iobase +
 183                                    TPM_STS(chip->vendor.locality) + 1);
 184                 burstcnt += ioread8(chip->vendor.iobase +
 185                                     TPM_STS(chip->vendor.locality) +
 186                                     2) << 8;
 187                 if (burstcnt)
 188                         return burstcnt;
 189                 msleep(TPM_TIMEOUT);
 190         } while (time_before(jiffies, stop));
 191         return -EBUSY;
 192 }
 193
 194 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 195 {
 196         int size = 0, burstcnt;
 197         while (size < count &&
 198                wait_for_tpm_stat(chip,
 199                                  TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 200                                  chip->vendor.timeout_c,
 201                                  &chip->vendor.read_queue)
 202                == 0) {
 203                 burstcnt = get_burstcount(chip);
 204                 for (; burstcnt > 0 && size < count; burstcnt--)
 205                         buf[size++] = ioread8(chip->vendor.iobase +
 206                                               TPM_DATA_FIFO(chip->vendor.
 207                                                             locality));
 208         }
 209         return size;
 210 }
 211
 212 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 213 {
 214         int size = 0;
 215         int expected, status;
 216
 217         if (count < TPM_HEADER_SIZE) {
 218                 size = -EIO;
 219                 goto out;
 220         }
 221
 222         /* read first 10 bytes, including tag, paramsize, and result */
 223         if ((size =
 224              recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
 225                 dev_err(chip->dev, "Unable to read header\n");
 226                 goto out;
 227         }
 228
 229         expected = be32_to_cpu(*(__be32 *) (buf + 2));
 230         if (expected > count) {
 231                 size = -EIO;
 232                 goto out;
 233         }
 234
 235         if ((size +=
 236              recv_data(chip, &buf[TPM_HEADER_SIZE],
 237                        expected - TPM_HEADER_SIZE)) < expected) {
 238                 dev_err(chip->dev, "Unable to read remainder of result\n");
 239                 size = -ETIME;
 240                 goto out;
 241         }
 242
 243         wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 244                           &chip->vendor.int_queue);
 245         status = tpm_tis_status(chip);
 246         if (status & TPM_STS_DATA_AVAIL) {      /* retry? */
 247                 dev_err(chip->dev, "Error left over data\n");
 248                 size = -EIO;
 249                 goto out;
 250         }
 251
 252 out:
 253         tpm_tis_ready(chip);
 254         release_locality(chip, chip->vendor.locality, 0);
 255         return size;
 256 }
 257
 258 static bool itpm;
 259 module_param(itpm, bool, 0444);
 260 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
 261
 262 /*
 263  * If interrupts are used (signaled by an irq set in the vendor structure)
 264  * tpm.c can skip polling for the data to be available as the interrupt is
 265  * waited for here
 266  */
 267 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 268 {
 269         int rc, status, burstcnt;
 270         size_t count = 0;
 271
 272         if (request_locality(chip, 0) < 0)
 273                 return -EBUSY;
 274
 275         status = tpm_tis_status(chip);
 276         if ((status & TPM_STS_COMMAND_READY) == 0) {
 277                 tpm_tis_ready(chip);
 278                 if (wait_for_tpm_stat
 279                     (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 280                      &chip->vendor.int_queue) < 0) {
 281                         rc = -ETIME;
 282                         goto out_err;
 283                 }
 284         }
 285
 286         while (count < len - 1) {
 287                 burstcnt = get_burstcount(chip);
 288                 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
 289                         iowrite8(buf[count], chip->vendor.iobase +
 290                                  TPM_DATA_FIFO(chip->vendor.locality));
 291                         count++;
 292                 }
 293
 294                 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 295                                   &chip->vendor.int_queue);
 296                 status = tpm_tis_status(chip);
 297                 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
 298                         rc = -EIO;
 299                         goto out_err;
 300                 }
 301         }
 302
 303         /* write last byte */
 304         iowrite8(buf[count],
 305                  chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
 306         wait_for_tpm_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         return 0;
 315
 316 out_err:
 317         tpm_tis_ready(chip);
 318         release_locality(chip, chip->vendor.locality, 0);
 319         return rc;
 320 }
 321
 322 /*
 323  * If interrupts are used (signaled by an irq set in the vendor structure)
 324  * tpm.c can skip polling for the data to be available as the interrupt is
 325  * waited for here
 326  */
 327 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 328 {
 329         int rc;
 330         u32 ordinal;
 331
 332         rc = tpm_tis_send_data(chip, buf, len);
 333         if (rc < 0)
 334                 return rc;
 335
 336         /* go and do it */
 337         iowrite8(TPM_STS_GO,
 338                  chip->vendor.iobase + TPM_STS(chip->vendor.locality));
 339
 340         if (chip->vendor.irq) {
 341                 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
 342                 if (wait_for_tpm_stat
 343                     (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 344                      tpm_calc_ordinal_duration(chip, ordinal),
 345                      &chip->vendor.read_queue) < 0) {
 346                         rc = -ETIME;
 347                         goto out_err;
 348                 }
 349         }
 350         return len;
 351 out_err:
 352         tpm_tis_ready(chip);
 353         release_locality(chip, chip->vendor.locality, 0);
 354         return rc;
 355 }
 356
 357 /*
 358  * Early probing for iTPM with STS_DATA_EXPECT flaw.
 359  * Try sending command without itpm flag set and if that
 360  * fails, repeat with itpm flag set.
 361  */
 362 static int probe_itpm(struct tpm_chip *chip)
 363 {
 364         int rc = 0;
 365         u8 cmd_getticks[] = {
 366                 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
 367                 0x00, 0x00, 0x00, 0xf1
 368         };
 369         size_t len = sizeof(cmd_getticks);
 370         int rem_itpm = itpm;
 371
 372         itpm = 0;
 373
 374         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 375         if (rc == 0)
 376                 goto out;
 377
 378         tpm_tis_ready(chip);
 379         release_locality(chip, chip->vendor.locality, 0);
 380
 381         itpm = 1;
 382
 383         rc = tpm_tis_send_data(chip, cmd_getticks, len);
 384         if (rc == 0) {
 385                 dev_info(chip->dev, "Detected an iTPM.\n");
 386                 rc = 1;
 387         } else
 388                 rc = -EFAULT;
 389
 390 out:
 391         itpm = rem_itpm;
 392         tpm_tis_ready(chip);
 393         /* some TPMs need a break here otherwise they will not work
 394          * correctly on the immediately subsequent command */
 395         msleep(chip->vendor.timeout_b);
 396         release_locality(chip, chip->vendor.locality, 0);
 397
 398         return rc;
 399 }
 400
 401 static const struct file_operations tis_ops = {
 402         .owner = THIS_MODULE,
 403         .llseek = no_llseek,
 404         .open = tpm_open,
 405         .read = tpm_read,
 406         .write = tpm_write,
 407         .release = tpm_release,
 408 };
 409
 410 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 411 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 412 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 413 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 414 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 415 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 416                    NULL);
 417 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 418 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 419 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
 420 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 421
 422 static struct attribute *tis_attrs[] = {
 423         &dev_attr_pubek.attr,
 424         &dev_attr_pcrs.attr,
 425         &dev_attr_enabled.attr,
 426         &dev_attr_active.attr,
 427         &dev_attr_owned.attr,
 428         &dev_attr_temp_deactivated.attr,
 429         &dev_attr_caps.attr,
 430         &dev_attr_cancel.attr,
 431         &dev_attr_durations.attr,
 432         &dev_attr_timeouts.attr, NULL,
 433 };
 434
 435 static struct attribute_group tis_attr_grp = {
 436         .attrs = tis_attrs
 437 };
 438
 439 static struct tpm_vendor_specific tpm_tis = {
 440         .status = tpm_tis_status,
 441         .recv = tpm_tis_recv,
 442         .send = tpm_tis_send,
 443         .cancel = tpm_tis_ready,
 444         .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 445         .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 446         .req_canceled = TPM_STS_COMMAND_READY,
 447         .attr_group = &tis_attr_grp,
 448         .miscdev = {
 449                     .fops = &tis_ops,},
 450 };
 451
 452 static irqreturn_t tis_int_probe(int irq, void *dev_id)
 453 {
 454         struct tpm_chip *chip = dev_id;
 455         u32 interrupt;
 456
 457         interrupt = ioread32(chip->vendor.iobase +
 458                              TPM_INT_STATUS(chip->vendor.locality));
 459
 460         if (interrupt == 0)
 461                 return IRQ_NONE;
 462
 463         chip->vendor.probed_irq = irq;
 464
 465         /* Clear interrupts handled with TPM_EOI */
 466         iowrite32(interrupt,
 467                   chip->vendor.iobase +
 468                   TPM_INT_STATUS(chip->vendor.locality));
 469         return IRQ_HANDLED;
 470 }
 471
 472 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
 473 {
 474         struct tpm_chip *chip = dev_id;
 475         u32 interrupt;
 476         int i;
 477
 478         interrupt = ioread32(chip->vendor.iobase +
 479                              TPM_INT_STATUS(chip->vendor.locality));
 480
 481         if (interrupt == 0)
 482                 return IRQ_NONE;
 483
 484         if (interrupt & TPM_INTF_DATA_AVAIL_INT)
 485                 wake_up_interruptible(&chip->vendor.read_queue);
 486         if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
 487                 for (i = 0; i < 5; i++)
 488                         if (check_locality(chip, i) >= 0)
 489                                 break;
 490         if (interrupt &
 491             (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
 492              TPM_INTF_CMD_READY_INT))
 493                 wake_up_interruptible(&chip->vendor.int_queue);
 494
 495         /* Clear interrupts handled with TPM_EOI */
 496         iowrite32(interrupt,
 497                   chip->vendor.iobase +
 498                   TPM_INT_STATUS(chip->vendor.locality));
 499         ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
 500         return IRQ_HANDLED;
 501 }
 502
 503 static bool interrupts = 1;
 504 module_param(interrupts, bool, 0444);
 505 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 506
 507 static int tpm_tis_init(struct device *dev, resource_size_t start,
 508                         resource_size_t len, unsigned int irq)
 509 {
 510         u32 vendor, intfcaps, intmask;
 511         int rc, i, irq_s, irq_e;
 512         struct tpm_chip *chip;
 513
 514         if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
 515                 return -ENODEV;
 516
 517         chip->vendor.iobase = ioremap(start, len);
 518         if (!chip->vendor.iobase) {
 519                 rc = -EIO;
 520                 goto out_err;
 521         }
 522
 523         /* Default timeouts */
 524         chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 525         chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 526         chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 527         chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 528
 529         if (request_locality(chip, 0) != 0) {
 530                 rc = -ENODEV;
 531                 goto out_err;
 532         }
 533
 534         vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 535
 536         dev_info(dev,
 537                  "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 538                  vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 539
 540         if (!itpm) {
 541                 itpm = probe_itpm(chip);
 542                 if (itpm < 0) {
 543                         rc = -ENODEV;
 544                         goto out_err;
 545                 }
 546         }
 547
 548         if (itpm)
 549                 dev_info(dev, "Intel iTPM workaround enabled\n");
 550
 551
 552         /* Figure out the capabilities */
 553         intfcaps =
 554             ioread32(chip->vendor.iobase +
 555                      TPM_INTF_CAPS(chip->vendor.locality));
 556         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
 557                 intfcaps);
 558         if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
 559                 dev_dbg(dev, "\tBurst Count Static\n");
 560         if (intfcaps & TPM_INTF_CMD_READY_INT)
 561                 dev_dbg(dev, "\tCommand Ready Int Support\n");
 562         if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
 563                 dev_dbg(dev, "\tInterrupt Edge Falling\n");
 564         if (intfcaps & TPM_INTF_INT_EDGE_RISING)
 565                 dev_dbg(dev, "\tInterrupt Edge Rising\n");
 566         if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
 567                 dev_dbg(dev, "\tInterrupt Level Low\n");
 568         if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
 569                 dev_dbg(dev, "\tInterrupt Level High\n");
 570         if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
 571                 dev_dbg(dev, "\tLocality Change Int Support\n");
 572         if (intfcaps & TPM_INTF_STS_VALID_INT)
 573                 dev_dbg(dev, "\tSts Valid Int Support\n");
 574         if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 575                 dev_dbg(dev, "\tData Avail Int Support\n");
 576
 577         /* get the timeouts before testing for irqs */
 578         if (tpm_get_timeouts(chip)) {
 579                 dev_err(dev, "Could not get TPM timeouts and durations\n");
 580                 rc = -ENODEV;
 581                 goto out_err;
 582         }
 583
 584         if (tpm_do_selftest(chip)) {
 585                 dev_err(dev, "TPM self test failed\n");
 586                 rc = -ENODEV;
 587                 goto out_err;
 588         }
 589
 590         /* INTERRUPT Setup */
 591         init_waitqueue_head(&chip->vendor.read_queue);
 592         init_waitqueue_head(&chip->vendor.int_queue);
 593
 594         intmask =
 595             ioread32(chip->vendor.iobase +
 596                      TPM_INT_ENABLE(chip->vendor.locality));
 597
 598         intmask |= TPM_INTF_CMD_READY_INT
 599             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 600             | TPM_INTF_STS_VALID_INT;
 601
 602         iowrite32(intmask,
 603                   chip->vendor.iobase +
 604                   TPM_INT_ENABLE(chip->vendor.locality));
 605         if (interrupts)
 606                 chip->vendor.irq = irq;
 607         if (interrupts && !chip->vendor.irq) {
 608                 irq_s =
 609                     ioread8(chip->vendor.iobase +
 610                             TPM_INT_VECTOR(chip->vendor.locality));
 611                 if (irq_s) {
 612                         irq_e = irq_s;
 613                 } else {
 614                         irq_s = 3;
 615                         irq_e = 15;
 616                 }
 617
 618                 for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
 619                         iowrite8(i, chip->vendor.iobase +
 620                                  TPM_INT_VECTOR(chip->vendor.locality));
 621                         if (request_irq
 622                             (i, tis_int_probe, IRQF_SHARED,
 623                              chip->vendor.miscdev.name, chip) != 0) {
 624                                 dev_info(chip->dev,
 625                                          "Unable to request irq: %d for probe\n",
 626                                          i);
 627                                 continue;
 628                         }
 629
 630                         /* Clear all existing */
 631                         iowrite32(ioread32
 632                                   (chip->vendor.iobase +
 633                                    TPM_INT_STATUS(chip->vendor.locality)),
 634                                   chip->vendor.iobase +
 635                                   TPM_INT_STATUS(chip->vendor.locality));
 636
 637                         /* Turn on */
 638                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 639                                   chip->vendor.iobase +
 640                                   TPM_INT_ENABLE(chip->vendor.locality));
 641
 642                         chip->vendor.probed_irq = 0;
 643
 644                         /* Generate Interrupts */
 645                         tpm_gen_interrupt(chip);
 646
 647                         chip->vendor.irq = chip->vendor.probed_irq;
 648
 649                         /* free_irq will call into tis_int_probe;
 650                            clear all irqs we haven't seen while doing
 651                            tpm_gen_interrupt */
 652                         iowrite32(ioread32
 653                                   (chip->vendor.iobase +
 654                                    TPM_INT_STATUS(chip->vendor.locality)),
 655                                   chip->vendor.iobase +
 656                                   TPM_INT_STATUS(chip->vendor.locality));
 657
 658                         /* Turn off */
 659                         iowrite32(intmask,
 660                                   chip->vendor.iobase +
 661                                   TPM_INT_ENABLE(chip->vendor.locality));
 662                         free_irq(i, chip);
 663                 }
 664         }
 665         if (chip->vendor.irq) {
 666                 iowrite8(chip->vendor.irq,
 667                          chip->vendor.iobase +
 668                          TPM_INT_VECTOR(chip->vendor.locality));
 669                 if (request_irq
 670                     (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
 671                      chip->vendor.miscdev.name, chip) != 0) {
 672                         dev_info(chip->dev,
 673                                  "Unable to request irq: %d for use\n",
 674                                  chip->vendor.irq);
 675                         chip->vendor.irq = 0;
 676                 } else {
 677                         /* Clear all existing */
 678                         iowrite32(ioread32
 679                                   (chip->vendor.iobase +
 680                                    TPM_INT_STATUS(chip->vendor.locality)),
 681                                   chip->vendor.iobase +
 682                                   TPM_INT_STATUS(chip->vendor.locality));
 683
 684                         /* Turn on */
 685                         iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
 686                                   chip->vendor.iobase +
 687                                   TPM_INT_ENABLE(chip->vendor.locality));
 688                 }
 689         }
 690
 691         INIT_LIST_HEAD(&chip->vendor.list);
 692         spin_lock(&tis_lock);
 693         list_add(&chip->vendor.list, &tis_chips);
 694         spin_unlock(&tis_lock);
 695
 696
 697         return 0;
 698 out_err:
 699         if (chip->vendor.iobase)
 700                 iounmap(chip->vendor.iobase);
 701         tpm_remove_hardware(chip->dev);
 702         return rc;
 703 }
 704
 705 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
 706 {
 707         u32 intmask;
 708
 709         /* reenable interrupts that device may have lost or
 710            BIOS/firmware may have disabled */
 711         iowrite8(chip->vendor.irq, chip->vendor.iobase +
 712                  TPM_INT_VECTOR(chip->vendor.locality));
 713
 714         intmask =
 715             ioread32(chip->vendor.iobase +
 716                      TPM_INT_ENABLE(chip->vendor.locality));
 717
 718         intmask |= TPM_INTF_CMD_READY_INT
 719             | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
 720             | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
 721
 722         iowrite32(intmask,
 723                   chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
 724 }
 725
 726
 727 #ifdef CONFIG_PNP
 728 static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 729                                       const struct pnp_device_id *pnp_id)
 730 {
 731         resource_size_t start, len;
 732         unsigned int irq = 0;
 733
 734         start = pnp_mem_start(pnp_dev, 0);
 735         len = pnp_mem_len(pnp_dev, 0);
 736
 737         if (pnp_irq_valid(pnp_dev, 0))
 738                 irq = pnp_irq(pnp_dev, 0);
 739         else
 740                 interrupts = 0;
 741
 742         if (is_itpm(pnp_dev))
 743                 itpm = 1;
 744
 745         return tpm_tis_init(&pnp_dev->dev, start, len, irq);
 746 }
 747
 748 static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
 749 {
 750         return tpm_pm_suspend(&dev->dev, msg);
 751 }
 752
 753 static int tpm_tis_pnp_resume(struct pnp_dev *dev)
 754 {
 755         struct tpm_chip *chip = pnp_get_drvdata(dev);
 756         int ret;
 757
 758         if (chip->vendor.irq)
 759                 tpm_tis_reenable_interrupts(chip);
 760
 761         ret = tpm_pm_resume(&dev->dev);
 762         if (!ret)
 763                 tpm_do_selftest(chip);
 764
 765         return ret;
 766 }
 767
 768 static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
 769         {"PNP0C31", 0},         /* TPM */
 770         {"ATM1200", 0},         /* Atmel */
 771         {"IFX0102", 0},         /* Infineon */
 772         {"BCM0101", 0},         /* Broadcom */
 773         {"BCM0102", 0},         /* Broadcom */
 774         {"NSC1200", 0},         /* National */
 775         {"ICO0102", 0},         /* Intel */
 776         /* Add new here */
 777         {"", 0},                /* User Specified */
 778         {"", 0}                 /* Terminator */
 779 };
 780 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
 781
 782 static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev)
 783 {
 784         struct tpm_chip *chip = pnp_get_drvdata(dev);
 785
 786         tpm_dev_vendor_release(chip);
 787
 788         kfree(chip);
 789 }
 790
 791
 792 static struct pnp_driver tis_pnp_driver = {
 793         .name = "tpm_tis",
 794         .id_table = tpm_pnp_tbl,
 795         .probe = tpm_tis_pnp_init,
 796         .suspend = tpm_tis_pnp_suspend,
 797         .resume = tpm_tis_pnp_resume,
 798         .remove = tpm_tis_pnp_remove,
 799 };
 800
 801 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
 802 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
 803                     sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
 804 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
 805 #endif
 806 static int tpm_tis_suspend(struct platform_device *dev, pm_message_t msg)
 807 {
 808         return tpm_pm_suspend(&dev->dev, msg);
 809 }
 810
 811 static int tpm_tis_resume(struct platform_device *dev)
 812 {
 813         struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
 814
 815         if (chip->vendor.irq)
 816                 tpm_tis_reenable_interrupts(chip);
 817
 818         return tpm_pm_resume(&dev->dev);
 819 }
 820 static struct platform_driver tis_drv = {
 821         .driver = {
 822                 .name = "tpm_tis",
 823                 .owner          = THIS_MODULE,
 824         },
 825         .suspend = tpm_tis_suspend,
 826         .resume = tpm_tis_resume,
 827 };
 828
 829 static struct platform_device *pdev;
 830
 831 static bool force;
 832 module_param(force, bool, 0444);
 833 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 834 static int __init init_tis(void)
 835 {
 836         int rc;
 837 #ifdef CONFIG_PNP
 838         if (!force)
 839                 return pnp_register_driver(&tis_pnp_driver);
 840 #endif
 841
 842         rc = platform_driver_register(&tis_drv);
 843         if (rc < 0)
 844                 return rc;
 845         if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
 846                 return PTR_ERR(pdev);
 847         if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
 848                 platform_device_unregister(pdev);
 849                 platform_driver_unregister(&tis_drv);
 850         }
 851         return rc;
 852 }
 853
 854 static void __exit cleanup_tis(void)
 855 {
 856         struct tpm_vendor_specific *i, *j;
 857         struct tpm_chip *chip;
 858         spin_lock(&tis_lock);
 859         list_for_each_entry_safe(i, j, &tis_chips, list) {
 860                 chip = to_tpm_chip(i);
 861                 tpm_remove_hardware(chip->dev);
 862                 iowrite32(~TPM_GLOBAL_INT_ENABLE &
 863                           ioread32(chip->vendor.iobase +
 864                                    TPM_INT_ENABLE(chip->vendor.
 865                                                   locality)),
 866                           chip->vendor.iobase +
 867                           TPM_INT_ENABLE(chip->vendor.locality));
 868                 release_locality(chip, chip->vendor.locality, 1);
 869                 if (chip->vendor.irq)
 870                         free_irq(chip->vendor.irq, chip);
 871                 iounmap(i->iobase);
 872                 list_del(&i->list);
 873         }
 874         spin_unlock(&tis_lock);
 875 #ifdef CONFIG_PNP
 876         if (!force) {
 877                 pnp_unregister_driver(&tis_pnp_driver);
 878                 return;
 879         }
 880 #endif
 881         platform_device_unregister(pdev);
 882         platform_driver_unregister(&tis_drv);
 883 }
 884
 885 module_init(init_tis);
 886 module_exit(cleanup_tis);
 887 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
 888 MODULE_DESCRIPTION("TPM Driver");
 889 MODULE_VERSION("2.0");
 890 MODULE_LICENSE("GPL");