drivers/char/tpm/tpm_infineon.c

   1 /*
   2  * Description:
   3  * Device Driver for the Infineon Technologies
   4  * SLD 9630 TT 1.1 and SLB 9635 TT 1.2 Trusted Platform Module
   5  * Specifications at www.trustedcomputinggroup.org
   6  *
   7  * Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
   8  * Applied Data Security Group, Ruhr-University Bochum, Germany
   9  * Project-Homepage: http://www.prosec.rub.de/tpm
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation, version 2 of the
  14  * License.
  15  */
  16
  17 #include <acpi/acpi_bus.h>
  18 #include <linux/pnp.h>
  19 #include "tpm.h"
  20
  21 /* Infineon specific definitions */
  22 /* maximum number of WTX-packages */
  23 #define TPM_MAX_WTX_PACKAGES    50
  24 /* msleep-Time for WTX-packages */
  25 #define TPM_WTX_MSLEEP_TIME     20
  26 /* msleep-Time --> Interval to check status register */
  27 #define TPM_MSLEEP_TIME         3
  28 /* gives number of max. msleep()-calls before throwing timeout */
  29 #define TPM_MAX_TRIES           5000
  30 #define TPM_INFINEON_DEV_VEN_VALUE      0x15D1
  31
  32 /* These values will be filled after ACPI-call */
  33 static int TPM_INF_DATA = 0;
  34 static int TPM_INF_ADDR = 0;
  35
  36 /* TPM header definitions */
  37 enum infineon_tpm_header {
  38         TPM_VL_VER = 0x01,
  39         TPM_VL_CHANNEL_CONTROL = 0x07,
  40         TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
  41         TPM_VL_CHANNEL_TPM = 0x0B,
  42         TPM_VL_CONTROL = 0x00,
  43         TPM_INF_NAK = 0x15,
  44         TPM_CTRL_WTX = 0x10,
  45         TPM_CTRL_WTX_ABORT = 0x18,
  46         TPM_CTRL_WTX_ABORT_ACK = 0x18,
  47         TPM_CTRL_ERROR = 0x20,
  48         TPM_CTRL_CHAININGACK = 0x40,
  49         TPM_CTRL_CHAINING = 0x80,
  50         TPM_CTRL_DATA = 0x04,
  51         TPM_CTRL_DATA_CHA = 0x84,
  52         TPM_CTRL_DATA_CHA_ACK = 0xC4
  53 };
  54
  55 enum infineon_tpm_register {
  56         WRFIFO = 0x00,
  57         RDFIFO = 0x01,
  58         STAT = 0x02,
  59         CMD = 0x03
  60 };
  61
  62 enum infineon_tpm_command_bits {
  63         CMD_DIS = 0x00,
  64         CMD_LP = 0x01,
  65         CMD_RES = 0x02,
  66         CMD_IRQC = 0x06
  67 };
  68
  69 enum infineon_tpm_status_bits {
  70         STAT_XFE = 0x00,
  71         STAT_LPA = 0x01,
  72         STAT_FOK = 0x02,
  73         STAT_TOK = 0x03,
  74         STAT_IRQA = 0x06,
  75         STAT_RDA = 0x07
  76 };
  77
  78 /* some outgoing values */
  79 enum infineon_tpm_values {
  80         CHIP_ID1 = 0x20,
  81         CHIP_ID2 = 0x21,
  82         TPM_DAR = 0x30,
  83         RESET_LP_IRQC_DISABLE = 0x41,
  84         ENABLE_REGISTER_PAIR = 0x55,
  85         IOLIMH = 0x60,
  86         IOLIML = 0x61,
  87         DISABLE_REGISTER_PAIR = 0xAA,
  88         IDVENL = 0xF1,
  89         IDVENH = 0xF2,
  90         IDPDL = 0xF3,
  91         IDPDH = 0xF4
  92 };
  93
  94 static int number_of_wtx;
  95
  96 static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
  97 {
  98         int status;
  99         int check = 0;
 100         int i;
 101
 102         if (clear_wrfifo) {
 103                 for (i = 0; i < 4096; i++) {
 104                         status = inb(chip->vendor->base + WRFIFO);
 105                         if (status == 0xff) {
 106                                 if (check == 5)
 107                                         break;
 108                                 else
 109                                         check++;
 110                         }
 111                 }
 112         }
 113         /* Note: The values which are currently in the FIFO of the TPM
 114            are thrown away since there is no usage for them. Usually,
 115            this has nothing to say, since the TPM will give its answer
 116            immediately or will be aborted anyway, so the data here is
 117            usually garbage and useless.
 118            We have to clean this, because the next communication with
 119            the TPM would be rubbish, if there is still some old data
 120            in the Read FIFO.
 121          */
 122         i = 0;
 123         do {
 124                 status = inb(chip->vendor->base + RDFIFO);
 125                 status = inb(chip->vendor->base + STAT);
 126                 i++;
 127                 if (i == TPM_MAX_TRIES)
 128                         return -EIO;
 129         } while ((status & (1 << STAT_RDA)) != 0);
 130         return 0;
 131 }
 132
 133 static int wait(struct tpm_chip *chip, int wait_for_bit)
 134 {
 135         int status;
 136         int i;
 137         for (i = 0; i < TPM_MAX_TRIES; i++) {
 138                 status = inb(chip->vendor->base + STAT);
 139                 /* check the status-register if wait_for_bit is set */
 140                 if (status & 1 << wait_for_bit)
 141                         break;
 142                 msleep(TPM_MSLEEP_TIME);
 143         }
 144         if (i == TPM_MAX_TRIES) {       /* timeout occurs */
 145                 if (wait_for_bit == STAT_XFE)
 146                         dev_err(&chip->pci_dev->dev,
 147                                 "Timeout in wait(STAT_XFE)\n");
 148                 if (wait_for_bit == STAT_RDA)
 149                         dev_err(&chip->pci_dev->dev,
 150                                 "Timeout in wait(STAT_RDA)\n");
 151                 return -EIO;
 152         }
 153         return 0;
 154 };
 155
 156 static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
 157 {
 158         wait(chip, STAT_XFE);
 159         outb(sendbyte, chip->vendor->base + WRFIFO);
 160 }
 161
 162     /* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
 163        calculation time, it sends a WTX-package, which has to be acknowledged
 164        or aborted. This usually occurs if you are hammering the TPM with key
 165        creation. Set the maximum number of WTX-packages in the definitions
 166        above, if the number is reached, the waiting-time will be denied
 167        and the TPM command has to be resend.
 168      */
 169
 170 static void tpm_wtx(struct tpm_chip *chip)
 171 {
 172         number_of_wtx++;
 173         dev_info(&chip->pci_dev->dev, "Granting WTX (%02d / %02d)\n",
 174                  number_of_wtx, TPM_MAX_WTX_PACKAGES);
 175         wait_and_send(chip, TPM_VL_VER);
 176         wait_and_send(chip, TPM_CTRL_WTX);
 177         wait_and_send(chip, 0x00);
 178         wait_and_send(chip, 0x00);
 179         msleep(TPM_WTX_MSLEEP_TIME);
 180 }
 181
 182 static void tpm_wtx_abort(struct tpm_chip *chip)
 183 {
 184         dev_info(&chip->pci_dev->dev, "Aborting WTX\n");
 185         wait_and_send(chip, TPM_VL_VER);
 186         wait_and_send(chip, TPM_CTRL_WTX_ABORT);
 187         wait_and_send(chip, 0x00);
 188         wait_and_send(chip, 0x00);
 189         number_of_wtx = 0;
 190         msleep(TPM_WTX_MSLEEP_TIME);
 191 }
 192
 193 static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
 194 {
 195         int i;
 196         int ret;
 197         u32 size = 0;
 198
 199 recv_begin:
 200         /* start receiving header */
 201         for (i = 0; i < 4; i++) {
 202                 ret = wait(chip, STAT_RDA);
 203                 if (ret)
 204                         return -EIO;
 205                 buf[i] = inb(chip->vendor->base + RDFIFO);
 206         }
 207
 208         if (buf[0] != TPM_VL_VER) {
 209                 dev_err(&chip->pci_dev->dev,
 210                         "Wrong transport protocol implementation!\n");
 211                 return -EIO;
 212         }
 213
 214         if (buf[1] == TPM_CTRL_DATA) {
 215                 /* size of the data received */
 216                 size = ((buf[2] << 8) | buf[3]);
 217
 218                 for (i = 0; i < size; i++) {
 219                         wait(chip, STAT_RDA);
 220                         buf[i] = inb(chip->vendor->base + RDFIFO);
 221                 }
 222
 223                 if ((size == 0x6D00) && (buf[1] == 0x80)) {
 224                         dev_err(&chip->pci_dev->dev,
 225                                 "Error handling on vendor layer!\n");
 226                         return -EIO;
 227                 }
 228
 229                 for (i = 0; i < size; i++)
 230                         buf[i] = buf[i + 6];
 231
 232                 size = size - 6;
 233                 return size;
 234         }
 235
 236         if (buf[1] == TPM_CTRL_WTX) {
 237                 dev_info(&chip->pci_dev->dev, "WTX-package received\n");
 238                 if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
 239                         tpm_wtx(chip);
 240                         goto recv_begin;
 241                 } else {
 242                         tpm_wtx_abort(chip);
 243                         goto recv_begin;
 244                 }
 245         }
 246
 247         if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
 248                 dev_info(&chip->pci_dev->dev, "WTX-abort acknowledged\n");
 249                 return size;
 250         }
 251
 252         if (buf[1] == TPM_CTRL_ERROR) {
 253                 dev_err(&chip->pci_dev->dev, "ERROR-package received:\n");
 254                 if (buf[4] == TPM_INF_NAK)
 255                         dev_err(&chip->pci_dev->dev,
 256                                 "-> Negative acknowledgement"
 257                                 " - retransmit command!\n");
 258                 return -EIO;
 259         }
 260         return -EIO;
 261 }
 262
 263 static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
 264 {
 265         int i;
 266         int ret;
 267         u8 count_high, count_low, count_4, count_3, count_2, count_1;
 268
 269         /* Disabling Reset, LP and IRQC */
 270         outb(RESET_LP_IRQC_DISABLE, chip->vendor->base + CMD);
 271
 272         ret = empty_fifo(chip, 1);
 273         if (ret) {
 274                 dev_err(&chip->pci_dev->dev, "Timeout while clearing FIFO\n");
 275                 return -EIO;
 276         }
 277
 278         ret = wait(chip, STAT_XFE);
 279         if (ret)
 280                 return -EIO;
 281
 282         count_4 = (count & 0xff000000) >> 24;
 283         count_3 = (count & 0x00ff0000) >> 16;
 284         count_2 = (count & 0x0000ff00) >> 8;
 285         count_1 = (count & 0x000000ff);
 286         count_high = ((count + 6) & 0xffffff00) >> 8;
 287         count_low = ((count + 6) & 0x000000ff);
 288
 289         /* Sending Header */
 290         wait_and_send(chip, TPM_VL_VER);
 291         wait_and_send(chip, TPM_CTRL_DATA);
 292         wait_and_send(chip, count_high);
 293         wait_and_send(chip, count_low);
 294
 295         /* Sending Data Header */
 296         wait_and_send(chip, TPM_VL_VER);
 297         wait_and_send(chip, TPM_VL_CHANNEL_TPM);
 298         wait_and_send(chip, count_4);
 299         wait_and_send(chip, count_3);
 300         wait_and_send(chip, count_2);
 301         wait_and_send(chip, count_1);
 302
 303         /* Sending Data */
 304         for (i = 0; i < count; i++) {
 305                 wait_and_send(chip, buf[i]);
 306         }
 307         return count;
 308 }
 309
 310 static void tpm_inf_cancel(struct tpm_chip *chip)
 311 {
 312         /*
 313            Since we are using the legacy mode to communicate
 314            with the TPM, we have no cancel functions, but have
 315            a workaround for interrupting the TPM through WTX.
 316          */
 317 }
 318
 319 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 320 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 321 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
 322 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 323
 324 static struct attribute *inf_attrs[] = {
 325         &dev_attr_pubek.attr,
 326         &dev_attr_pcrs.attr,
 327         &dev_attr_caps.attr,
 328         &dev_attr_cancel.attr,
 329         NULL,
 330 };
 331
 332 static struct attribute_group inf_attr_grp = {.attrs = inf_attrs };
 333
 334 static struct file_operations inf_ops = {
 335         .owner = THIS_MODULE,
 336         .llseek = no_llseek,
 337         .open = tpm_open,
 338         .read = tpm_read,
 339         .write = tpm_write,
 340         .release = tpm_release,
 341 };
 342
 343 static struct tpm_vendor_specific tpm_inf = {
 344         .recv = tpm_inf_recv,
 345         .send = tpm_inf_send,
 346         .cancel = tpm_inf_cancel,
 347         .req_complete_mask = 0,
 348         .req_complete_val = 0,
 349         .attr_group = &inf_attr_grp,
 350         .miscdev = {.fops = &inf_ops,},
 351 };
 352
 353 static const struct pnp_device_id tpm_pnp_tbl[] = {
 354         /* Infineon TPMs */
 355         {"IFX0101", 0},
 356         {"IFX0102", 0},
 357         {"", 0}
 358 };
 359
 360 static int __devinit tpm_inf_acpi_probe(struct pnp_dev *dev,
 361                                         const struct pnp_device_id *dev_id)
 362 {
 363         TPM_INF_ADDR = (pnp_port_start(dev, 0) & 0xff);
 364         TPM_INF_DATA = ((TPM_INF_ADDR + 1) & 0xff);
 365         tpm_inf.base = pnp_port_start(dev, 1);
 366         dev_info(&dev->dev, "Found %s with ID %s\n",
 367                  dev->name, dev_id->id);
 368         if (!((tpm_inf.base >> 8) & 0xff))
 369                 tpm_inf.base = 0;
 370         return 0;
 371 }
 372
 373 static struct pnp_driver tpm_inf_pnp = {
 374         .name = "tpm_inf_pnp",
 375         .id_table = tpm_pnp_tbl,
 376         .probe = tpm_inf_acpi_probe,
 377 };
 378
 379 static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
 380                                    const struct pci_device_id *pci_id)
 381 {
 382         int rc = 0;
 383         u8 iol, ioh;
 384         int vendorid[2];
 385         int version[2];
 386         int productid[2];
 387         char chipname[20];
 388
 389         if (pci_enable_device(pci_dev))
 390                 return -EIO;
 391
 392         dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);
 393
 394         /* read IO-ports from ACPI */
 395         pnp_register_driver(&tpm_inf_pnp);
 396         pnp_unregister_driver(&tpm_inf_pnp);
 397
 398         /* Make sure, we have received valid config ports */
 399         if (!TPM_INF_ADDR) {
 400                 pci_disable_device(pci_dev);
 401                 return -EIO;
 402         }
 403
 404         /* query chip for its vendor, its version number a.s.o. */
 405         outb(ENABLE_REGISTER_PAIR, TPM_INF_ADDR);
 406         outb(IDVENL, TPM_INF_ADDR);
 407         vendorid[1] = inb(TPM_INF_DATA);
 408         outb(IDVENH, TPM_INF_ADDR);
 409         vendorid[0] = inb(TPM_INF_DATA);
 410         outb(IDPDL, TPM_INF_ADDR);
 411         productid[1] = inb(TPM_INF_DATA);
 412         outb(IDPDH, TPM_INF_ADDR);
 413         productid[0] = inb(TPM_INF_DATA);
 414         outb(CHIP_ID1, TPM_INF_ADDR);
 415         version[1] = inb(TPM_INF_DATA);
 416         outb(CHIP_ID2, TPM_INF_ADDR);
 417         version[0] = inb(TPM_INF_DATA);
 418
 419         switch ((productid[0] << 8) | productid[1]) {
 420         case 6:
 421                 sprintf(chipname, " (SLD 9630 TT 1.1)");
 422                 break;
 423         case 11:
 424                 sprintf(chipname, " (SLB 9635 TT 1.2)");
 425                 break;
 426         default:
 427                 sprintf(chipname, " (unknown chip)");
 428                 break;
 429         }
 430         chipname[19] = 0;
 431
 432         if ((vendorid[0] << 8 | vendorid[1]) == (TPM_INFINEON_DEV_VEN_VALUE)) {
 433
 434                 if (tpm_inf.base == 0) {
 435                         dev_err(&pci_dev->dev, "No IO-ports found!\n");
 436                         pci_disable_device(pci_dev);
 437                         return -EIO;
 438                 }
 439                 /* configure TPM with IO-ports */
 440                 outb(IOLIMH, TPM_INF_ADDR);
 441                 outb(((tpm_inf.base >> 8) & 0xff), TPM_INF_DATA);
 442                 outb(IOLIML, TPM_INF_ADDR);
 443                 outb((tpm_inf.base & 0xff), TPM_INF_DATA);
 444
 445                 /* control if IO-ports are set correctly */
 446                 outb(IOLIMH, TPM_INF_ADDR);
 447                 ioh = inb(TPM_INF_DATA);
 448                 outb(IOLIML, TPM_INF_ADDR);
 449                 iol = inb(TPM_INF_DATA);
 450
 451                 if ((ioh << 8 | iol) != tpm_inf.base) {
 452                         dev_err(&pci_dev->dev,
 453                                 "Could not set IO-ports to %04x\n",
 454                                 tpm_inf.base);
 455                         pci_disable_device(pci_dev);
 456                         return -EIO;
 457                 }
 458
 459                 /* activate register */
 460                 outb(TPM_DAR, TPM_INF_ADDR);
 461                 outb(0x01, TPM_INF_DATA);
 462                 outb(DISABLE_REGISTER_PAIR, TPM_INF_ADDR);
 463
 464                 /* disable RESET, LP and IRQC */
 465                 outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);
 466
 467                 /* Finally, we're done, print some infos */
 468                 dev_info(&pci_dev->dev, "TPM found: "
 469                          "config base 0x%x, "
 470                          "io base 0x%x, "
 471                          "chip version %02x%02x, "
 472                          "vendor id %x%x (Infineon), "
 473                          "product id %02x%02x"
 474                          "%s\n",
 475                          TPM_INF_ADDR,
 476                          tpm_inf.base,
 477                          version[0], version[1],
 478                          vendorid[0], vendorid[1],
 479                          productid[0], productid[1], chipname);
 480
 481                 rc = tpm_register_hardware(pci_dev, &tpm_inf);
 482                 if (rc < 0) {
 483                         pci_disable_device(pci_dev);
 484                         return -ENODEV;
 485                 }
 486                 return 0;
 487         } else {
 488                 dev_info(&pci_dev->dev, "No Infineon TPM found!\n");
 489                 pci_disable_device(pci_dev);
 490                 return -ENODEV;
 491         }
 492 }
 493
 494 static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
 495         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
 496         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
 497         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
 498         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
 499         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
 500         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
 501         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
 502         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2)},
 503         {0,}
 504 };
 505
 506 MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
 507
 508 static struct pci_driver inf_pci_driver = {
 509         .name = "tpm_inf",
 510         .id_table = tpm_pci_tbl,
 511         .probe = tpm_inf_probe,
 512         .remove = __devexit_p(tpm_remove),
 513         .suspend = tpm_pm_suspend,
 514         .resume = tpm_pm_resume,
 515 };
 516
 517 static int __init init_inf(void)
 518 {
 519         return pci_register_driver(&inf_pci_driver);
 520 }
 521
 522 static void __exit cleanup_inf(void)
 523 {
 524         pci_unregister_driver(&inf_pci_driver);
 525 }
 526
 527 module_init(init_inf);
 528 module_exit(cleanup_inf);
 529
 530 MODULE_AUTHOR("Marcel Selhorst <selhorst@crypto.rub.de>");
 531 MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT 1.1 / SLB 9635 TT 1.2");
 532 MODULE_VERSION("1.5");
 533 MODULE_LICENSE("GPL");