drivers/tpm/tpm2_tis_spi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author:
   4  * Miquel Raynal <miquel.raynal@bootlin.com>
   5  *
   6  * Description:
   7  * SPI-level driver for TCG/TIS TPM (trusted platform module).
   8  * Specifications at www.trustedcomputinggroup.org
   9  *
  10  * This device driver implements the TPM interface as defined in
  11  * the TCG SPI protocol stack version 2.0.
  12  *
  13  * It is based on the U-Boot driver tpm_tis_infineon_i2c.c.
  14  */
  15
  16 #include <common.h>
  17 #include <dm.h>
  18 #include <fdtdec.h>
  19 #include <log.h>
  20 #include <spi.h>
  21 #include <tpm-v2.h>
  22 #include <linux/errno.h>
  23 #include <linux/compiler.h>
  24 #include <linux/types.h>
  25 #include <linux/unaligned/be_byteshift.h>
  26 #include <asm-generic/gpio.h>
  27
  28 #include "tpm_tis.h"
  29 #include "tpm_internal.h"
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 #define TPM_ACCESS(l)                   (0x0000 | ((l) << 12))
  34 #define TPM_INT_ENABLE(l)               (0x0008 | ((l) << 12))
  35 #define TPM_STS(l)                      (0x0018 | ((l) << 12))
  36 #define TPM_DATA_FIFO(l)                (0x0024 | ((l) << 12))
  37 #define TPM_DID_VID(l)                  (0x0F00 | ((l) << 12))
  38 #define TPM_RID(l)                      (0x0F04 | ((l) << 12))
  39
  40 #define MAX_SPI_FRAMESIZE 64
  41
  42 /* Number of wait states to wait for */
  43 #define TPM_WAIT_STATES 100
  44
  45 /**
  46  * struct tpm_tis_chip_data - Non-discoverable TPM information
  47  *
  48  * @pcr_count:          Number of PCR per bank
  49  * @pcr_select_min:     Size in octets of the pcrSelect array
  50  */
  51 struct tpm_tis_chip_data {
  52         unsigned int pcr_count;
  53         unsigned int pcr_select_min;
  54         unsigned int time_before_first_cmd_ms;
  55 };
  56
  57 /**
  58  * tpm_tis_spi_read() - Read from TPM register
  59  *
  60  * @addr: register address to read from
  61  * @buffer: provided by caller
  62  * @len: number of bytes to read
  63  *
  64  * Read len bytes from TPM register and put them into
  65  * buffer (little-endian format, i.e. first byte is put into buffer[0]).
  66  *
  67  * NOTE: TPM is big-endian for multi-byte values. Multi-byte
  68  * values have to be swapped.
  69  *
  70  * @return -EIO on error, 0 on success.
  71  */
  72 static int tpm_tis_spi_xfer(struct udevice *dev, u32 addr, const u8 *out,
  73                             u8 *in, u16 len)
  74 {
  75         struct spi_slave *slave = dev_get_parent_priv(dev);
  76         int transfer_len, ret;
  77         u8 tx_buf[MAX_SPI_FRAMESIZE];
  78         u8 rx_buf[MAX_SPI_FRAMESIZE];
  79
  80         if (in && out) {
  81                 log(LOGC_NONE, LOGL_ERR, "%s: can't do full duplex\n",
  82                     __func__);
  83                 return -EINVAL;
  84         }
  85
  86         ret = spi_claim_bus(slave);
  87         if (ret < 0) {
  88                 log(LOGC_NONE, LOGL_ERR, "%s: could not claim bus\n", __func__);
  89                 return ret;
  90         }
  91
  92         while (len) {
  93                 /* Request */
  94                 transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);
  95                 tx_buf[0] = (in ? BIT(7) : 0) | (transfer_len - 1);
  96                 tx_buf[1] = 0xD4;
  97                 tx_buf[2] = addr >> 8;
  98                 tx_buf[3] = addr;
  99
 100                 ret = spi_xfer(slave, 4 * 8, tx_buf, rx_buf, SPI_XFER_BEGIN);
 101                 if (ret < 0) {
 102                         log(LOGC_NONE, LOGL_ERR,
 103                             "%s: spi request transfer failed (err: %d)\n",
 104                             __func__, ret);
 105                         goto release_bus;
 106                 }
 107
 108                 /* Wait state */
 109                 if (!(rx_buf[3] & 0x1)) {
 110                         int i;
 111
 112                         for (i = 0; i < TPM_WAIT_STATES; i++) {
 113                                 ret = spi_xfer(slave, 1 * 8, NULL, rx_buf, 0);
 114                                 if (ret) {
 115                                         log(LOGC_NONE, LOGL_ERR,
 116                                             "%s: wait state failed: %d\n",
 117                                             __func__, ret);
 118                                         goto release_bus;
 119                                 }
 120
 121                                 if (rx_buf[0] & 0x1)
 122                                         break;
 123                         }
 124
 125                         if (i == TPM_WAIT_STATES) {
 126                                 log(LOGC_NONE, LOGL_ERR,
 127                                     "%s: timeout on wait state\n", __func__);
 128                                 ret = -ETIMEDOUT;
 129                                 goto release_bus;
 130                         }
 131                 }
 132
 133                 /* Read/Write */
 134                 if (out) {
 135                         memcpy(tx_buf, out, transfer_len);
 136                         out += transfer_len;
 137                 }
 138
 139                 ret = spi_xfer(slave, transfer_len * 8,
 140                                out ? tx_buf : NULL,
 141                                in ? rx_buf : NULL,
 142                                SPI_XFER_END);
 143                 if (ret) {
 144                         log(LOGC_NONE, LOGL_ERR,
 145                             "%s: spi read transfer failed (err: %d)\n",
 146                             __func__, ret);
 147                         goto release_bus;
 148                 }
 149
 150                 if (in) {
 151                         memcpy(in, rx_buf, transfer_len);
 152                         in += transfer_len;
 153                 }
 154
 155                 len -= transfer_len;
 156         }
 157
 158 release_bus:
 159         /* If an error occurred, release the chip by deasserting the CS */
 160         if (ret < 0)
 161                 spi_xfer(slave, 0, NULL, NULL, SPI_XFER_END);
 162
 163         spi_release_bus(slave);
 164
 165         return ret;
 166 }
 167
 168 static int tpm_tis_spi_read(struct udevice *dev, u16 addr, u8 *in, u16 len)
 169 {
 170         return tpm_tis_spi_xfer(dev, addr, NULL, in, len);
 171 }
 172
 173 static int tpm_tis_spi_read32(struct udevice *dev, u32 addr, u32 *result)
 174 {
 175         __le32 result_le;
 176         int ret;
 177
 178         ret = tpm_tis_spi_read(dev, addr, (u8 *)&result_le, sizeof(u32));
 179         if (!ret)
 180                 *result = le32_to_cpu(result_le);
 181
 182         return ret;
 183 }
 184
 185 static int tpm_tis_spi_write(struct udevice *dev, u16 addr, const u8 *out,
 186                              u16 len)
 187 {
 188         return tpm_tis_spi_xfer(dev, addr, out, NULL, len);
 189 }
 190
 191 static int tpm_tis_spi_check_locality(struct udevice *dev, int loc)
 192 {
 193         const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
 194         struct tpm_chip *chip = dev_get_priv(dev);
 195         u8 buf;
 196         int ret;
 197
 198         ret = tpm_tis_spi_read(dev, TPM_ACCESS(loc), &buf, 1);
 199         if (ret)
 200                 return ret;
 201
 202         if ((buf & mask) == mask) {
 203                 chip->locality = loc;
 204                 return 0;
 205         }
 206
 207         return -ENOENT;
 208 }
 209
 210 static void tpm_tis_spi_release_locality(struct udevice *dev, int loc,
 211                                          bool force)
 212 {
 213         const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
 214         u8 buf;
 215
 216         if (tpm_tis_spi_read(dev, TPM_ACCESS(loc), &buf, 1) < 0)
 217                 return;
 218
 219         if (force || (buf & mask) == mask) {
 220                 buf = TPM_ACCESS_ACTIVE_LOCALITY;
 221                 tpm_tis_spi_write(dev, TPM_ACCESS(loc), &buf, 1);
 222         }
 223 }
 224
 225 static int tpm_tis_spi_request_locality(struct udevice *dev, int loc)
 226 {
 227         struct tpm_chip *chip = dev_get_priv(dev);
 228         unsigned long start, stop;
 229         u8 buf = TPM_ACCESS_REQUEST_USE;
 230         int ret;
 231
 232         ret = tpm_tis_spi_check_locality(dev, loc);
 233         if (!ret)
 234                 return 0;
 235
 236         if (ret != -ENOENT) {
 237                 log(LOGC_NONE, LOGL_ERR, "%s: Failed to get locality: %d\n",
 238                     __func__, ret);
 239                 return ret;
 240         }
 241
 242         ret = tpm_tis_spi_write(dev, TPM_ACCESS(loc), &buf, 1);
 243         if (ret) {
 244                 log(LOGC_NONE, LOGL_ERR, "%s: Failed to write to TPM: %d\n",
 245                     __func__, ret);
 246                 return ret;
 247         }
 248
 249         start = get_timer(0);
 250         stop = chip->timeout_a;
 251         do {
 252                 ret = tpm_tis_spi_check_locality(dev, loc);
 253                 if (!ret)
 254                         return 0;
 255
 256                 if (ret != -ENOENT) {
 257                         log(LOGC_NONE, LOGL_ERR,
 258                             "%s: Failed to get locality: %d\n", __func__, ret);
 259                         return ret;
 260                 }
 261
 262                 mdelay(TPM_TIMEOUT_MS);
 263         } while (get_timer(start) < stop);
 264
 265         log(LOGC_NONE, LOGL_ERR, "%s: Timeout getting locality: %d\n", __func__,
 266             ret);
 267
 268         return ret;
 269 }
 270
 271 static u8 tpm_tis_spi_status(struct udevice *dev, u8 *status)
 272 {
 273         struct tpm_chip *chip = dev_get_priv(dev);
 274
 275         return tpm_tis_spi_read(dev, TPM_STS(chip->locality), status, 1);
 276 }
 277
 278 static int tpm_tis_spi_wait_for_stat(struct udevice *dev, u8 mask,
 279                                      unsigned long timeout, u8 *status)
 280 {
 281         unsigned long start = get_timer(0);
 282         unsigned long stop = timeout;
 283         int ret;
 284
 285         do {
 286                 mdelay(TPM_TIMEOUT_MS);
 287                 ret = tpm_tis_spi_status(dev, status);
 288                 if (ret)
 289                         return ret;
 290
 291                 if ((*status & mask) == mask)
 292                         return 0;
 293         } while (get_timer(start) < stop);
 294
 295         return -ETIMEDOUT;
 296 }
 297
 298 static u8 tpm_tis_spi_valid_status(struct udevice *dev, u8 *status)
 299 {
 300         struct tpm_chip *chip = dev_get_priv(dev);
 301
 302         return tpm_tis_spi_wait_for_stat(dev, TPM_STS_VALID,
 303                 chip->timeout_c, status);
 304 }
 305
 306 static int tpm_tis_spi_get_burstcount(struct udevice *dev)
 307 {
 308         struct tpm_chip *chip = dev_get_priv(dev);
 309         unsigned long start, stop;
 310         u32 burstcount, ret;
 311
 312         /* wait for burstcount */
 313         start = get_timer(0);
 314         stop = chip->timeout_d;
 315         do {
 316                 ret = tpm_tis_spi_read32(dev, TPM_STS(chip->locality),
 317                                          &burstcount);
 318                 if (ret)
 319                         return -EBUSY;
 320
 321                 burstcount = (burstcount >> 8) & 0xFFFF;
 322                 if (burstcount)
 323                         return burstcount;
 324
 325                 mdelay(TPM_TIMEOUT_MS);
 326         } while (get_timer(start) < stop);
 327
 328         return -EBUSY;
 329 }
 330
 331 static int tpm_tis_spi_cancel(struct udevice *dev)
 332 {
 333         struct tpm_chip *chip = dev_get_priv(dev);
 334         u8 data = TPM_STS_COMMAND_READY;
 335
 336         return tpm_tis_spi_write(dev, TPM_STS(chip->locality), &data, 1);
 337 }
 338
 339 static int tpm_tis_spi_recv_data(struct udevice *dev, u8 *buf, size_t count)
 340 {
 341         struct tpm_chip *chip = dev_get_priv(dev);
 342         int size = 0, burstcnt, len, ret;
 343         u8 status;
 344
 345         while (size < count &&
 346                tpm_tis_spi_wait_for_stat(dev,
 347                                          TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 348                                          chip->timeout_c, &status) == 0) {
 349                 burstcnt = tpm_tis_spi_get_burstcount(dev);
 350                 if (burstcnt < 0)
 351                         return burstcnt;
 352
 353                 len = min_t(int, burstcnt, count - size);
 354                 ret = tpm_tis_spi_read(dev, TPM_DATA_FIFO(chip->locality),
 355                                        buf + size, len);
 356                 if (ret < 0)
 357                         return ret;
 358
 359                 size += len;
 360         }
 361
 362         return size;
 363 }
 364
 365 static int tpm_tis_spi_recv(struct udevice *dev, u8 *buf, size_t count)
 366 {
 367         struct tpm_chip *chip = dev_get_priv(dev);
 368         int size, expected;
 369
 370         if (!chip)
 371                 return -ENODEV;
 372
 373         if (count < TPM_HEADER_SIZE) {
 374                 size = -EIO;
 375                 goto out;
 376         }
 377
 378         size = tpm_tis_spi_recv_data(dev, buf, TPM_HEADER_SIZE);
 379         if (size < TPM_HEADER_SIZE) {
 380                 log(LOGC_NONE, LOGL_ERR, "TPM error, unable to read header\n");
 381                 goto out;
 382         }
 383
 384         expected = get_unaligned_be32(buf + 2);
 385         if (expected > count) {
 386                 size = -EIO;
 387                 goto out;
 388         }
 389
 390         size += tpm_tis_spi_recv_data(dev, &buf[TPM_HEADER_SIZE],
 391                                    expected - TPM_HEADER_SIZE);
 392         if (size < expected) {
 393                 log(LOGC_NONE, LOGL_ERR,
 394                     "TPM error, unable to read remaining bytes of result\n");
 395                 size = -EIO;
 396                 goto out;
 397         }
 398
 399 out:
 400         tpm_tis_spi_cancel(dev);
 401         tpm_tis_spi_release_locality(dev, chip->locality, false);
 402
 403         return size;
 404 }
 405
 406 static int tpm_tis_spi_send(struct udevice *dev, const u8 *buf, size_t len)
 407 {
 408         struct tpm_chip *chip = dev_get_priv(dev);
 409         u32 i, size;
 410         u8 status;
 411         int burstcnt, ret;
 412         u8 data;
 413
 414         if (!chip)
 415                 return -ENODEV;
 416
 417         if (len > TPM_DEV_BUFSIZE)
 418                 return -E2BIG;  /* Command is too long for our tpm, sorry */
 419
 420         ret = tpm_tis_spi_request_locality(dev, 0);
 421         if (ret < 0)
 422                 return -EBUSY;
 423
 424         /*
 425          * Check if the TPM is ready. If not, if not, cancel the pending command
 426          * and poll on the status to be finally ready.
 427          */
 428         ret = tpm_tis_spi_status(dev, &status);
 429         if (ret)
 430                 return ret;
 431
 432         if (!(status & TPM_STS_COMMAND_READY)) {
 433                 /* Force the transition, usually this will be done at startup */
 434                 ret = tpm_tis_spi_cancel(dev);
 435                 if (ret) {
 436                         log(LOGC_NONE, LOGL_ERR,
 437                             "%s: Could not cancel previous operation\n",
 438                             __func__);
 439                         goto out_err;
 440                 }
 441
 442                 ret = tpm_tis_spi_wait_for_stat(dev, TPM_STS_COMMAND_READY,
 443                                                 chip->timeout_b, &status);
 444                 if (ret < 0 || !(status & TPM_STS_COMMAND_READY)) {
 445                         log(LOGC_NONE, LOGL_ERR,
 446                             "status %d after wait for stat returned %d\n",
 447                             status, ret);
 448                         goto out_err;
 449                 }
 450         }
 451
 452         for (i = 0; i < len - 1;) {
 453                 burstcnt = tpm_tis_spi_get_burstcount(dev);
 454                 if (burstcnt < 0)
 455                         return burstcnt;
 456
 457                 size = min_t(int, len - i - 1, burstcnt);
 458                 ret = tpm_tis_spi_write(dev, TPM_DATA_FIFO(chip->locality),
 459                                         buf + i, size);
 460                 if (ret < 0)
 461                         goto out_err;
 462
 463                 i += size;
 464         }
 465
 466         ret = tpm_tis_spi_valid_status(dev, &status);
 467         if (ret)
 468                 goto out_err;
 469
 470         if ((status & TPM_STS_DATA_EXPECT) == 0) {
 471                 ret = -EIO;
 472                 goto out_err;
 473         }
 474
 475         ret = tpm_tis_spi_write(dev, TPM_DATA_FIFO(chip->locality),
 476                                 buf + len - 1, 1);
 477         if (ret)
 478                 goto out_err;
 479
 480         ret = tpm_tis_spi_valid_status(dev, &status);
 481         if (ret)
 482                 goto out_err;
 483
 484         if ((status & TPM_STS_DATA_EXPECT) != 0) {
 485                 ret = -EIO;
 486                 goto out_err;
 487         }
 488
 489         data = TPM_STS_GO;
 490         ret = tpm_tis_spi_write(dev, TPM_STS(chip->locality), &data, 1);
 491         if (ret)
 492                 goto out_err;
 493
 494         return len;
 495
 496 out_err:
 497         tpm_tis_spi_cancel(dev);
 498         tpm_tis_spi_release_locality(dev, chip->locality, false);
 499
 500         return ret;
 501 }
 502
 503 static int tpm_tis_spi_cleanup(struct udevice *dev)
 504 {
 505         struct tpm_chip *chip = dev_get_priv(dev);
 506
 507         tpm_tis_spi_cancel(dev);
 508         /*
 509          * The TPM needs some time to clean up here,
 510          * so we sleep rather than keeping the bus busy
 511          */
 512         mdelay(2);
 513         tpm_tis_spi_release_locality(dev, chip->locality, false);
 514
 515         return 0;
 516 }
 517
 518 static int tpm_tis_spi_open(struct udevice *dev)
 519 {
 520         struct tpm_chip *chip = dev_get_priv(dev);
 521         struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 522
 523         if (chip->is_open)
 524                 return -EBUSY;
 525
 526         chip->is_open = 1;
 527
 528         return 0;
 529 }
 530
 531 static int tpm_tis_spi_close(struct udevice *dev)
 532 {
 533         struct tpm_chip *chip = dev_get_priv(dev);
 534
 535         if (chip->is_open) {
 536                 tpm_tis_spi_release_locality(dev, chip->locality, true);
 537                 chip->is_open = 0;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size)
 544 {
 545         struct tpm_chip *chip = dev_get_priv(dev);
 546
 547         if (size < 80)
 548                 return -ENOSPC;
 549
 550         return snprintf(buf, size,
 551                         "%s v2.0: VendorID 0x%04x, DeviceID 0x%04x, RevisionID 0x%02x [%s]",
 552                         dev->name, chip->vend_dev & 0xFFFF,
 553                         chip->vend_dev >> 16, chip->rid,
 554                         (chip->is_open ? "open" : "closed"));
 555 }
 556
 557 static int tpm_tis_wait_init(struct udevice *dev, int loc)
 558 {
 559         struct tpm_chip *chip = dev_get_priv(dev);
 560         unsigned long start, stop;
 561         u8 status;
 562         int ret;
 563
 564         start = get_timer(0);
 565         stop = chip->timeout_b;
 566         do {
 567                 mdelay(TPM_TIMEOUT_MS);
 568
 569                 ret = tpm_tis_spi_read(dev, TPM_ACCESS(loc), &status, 1);
 570                 if (ret)
 571                         break;
 572
 573                 if (status & TPM_ACCESS_VALID)
 574                         return 0;
 575         } while (get_timer(start) < stop);
 576
 577         return -EIO;
 578 }
 579
 580 static int tpm_tis_spi_probe(struct udevice *dev)
 581 {
 582         struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
 583         struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 584         struct tpm_chip *chip = dev_get_priv(dev);
 585         int ret;
 586
 587         /* Use the TPM v2 stack */
 588         priv->version = TPM_V2;
 589
 590         if (IS_ENABLED(CONFIG_DM_GPIO)) {
 591                 struct gpio_desc reset_gpio;
 592
 593                 ret = gpio_request_by_name(dev, "gpio-reset", 0,
 594                                            &reset_gpio, GPIOD_IS_OUT);
 595                 if (ret) {
 596                         log(LOGC_NONE, LOGL_NOTICE, "%s: missing reset GPIO\n",
 597                             __func__);
 598                 } else {
 599                         dm_gpio_set_value(&reset_gpio, 0);
 600                         mdelay(1);
 601                         dm_gpio_set_value(&reset_gpio, 1);
 602                 }
 603         }
 604
 605         /* Ensure a minimum amount of time elapsed since reset of the TPM */
 606         mdelay(drv_data->time_before_first_cmd_ms);
 607
 608         chip->locality = 0;
 609         chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
 610         chip->timeout_b = TIS_LONG_TIMEOUT_MS;
 611         chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
 612         chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
 613         priv->pcr_count = drv_data->pcr_count;
 614         priv->pcr_select_min = drv_data->pcr_select_min;
 615
 616         ret = tpm_tis_wait_init(dev, chip->locality);
 617         if (ret) {
 618                 log(LOGC_DM, LOGL_ERR, "%s: no device found\n", __func__);
 619                 return ret;
 620         }
 621
 622         ret = tpm_tis_spi_request_locality(dev, chip->locality);
 623         if (ret) {
 624                 log(LOGC_NONE, LOGL_ERR, "%s: could not request locality %d\n",
 625                     __func__, chip->locality);
 626                 return ret;
 627         }
 628
 629         ret = tpm_tis_spi_read32(dev, TPM_DID_VID(chip->locality),
 630                                  &chip->vend_dev);
 631         if (ret) {
 632                 log(LOGC_NONE, LOGL_ERR,
 633                     "%s: could not retrieve VendorID/DeviceID\n", __func__);
 634                 return ret;
 635         }
 636
 637         ret = tpm_tis_spi_read(dev, TPM_RID(chip->locality), &chip->rid, 1);
 638         if (ret) {
 639                 log(LOGC_NONE, LOGL_ERR, "%s: could not retrieve RevisionID\n",
 640                     __func__);
 641                 return ret;
 642         }
 643
 644         log(LOGC_NONE, LOGL_ERR,
 645             "SPI TPMv2.0 found (vid:%04x, did:%04x, rid:%02x)\n",
 646             chip->vend_dev & 0xFFFF, chip->vend_dev >> 16, chip->rid);
 647
 648         return 0;
 649 }
 650
 651 static int tpm_tis_spi_remove(struct udevice *dev)
 652 {
 653         struct tpm_chip *chip = dev_get_priv(dev);
 654
 655         tpm_tis_spi_release_locality(dev, chip->locality, true);
 656
 657         return 0;
 658 }
 659
 660 static const struct tpm_ops tpm_tis_spi_ops = {
 661         .open           = tpm_tis_spi_open,
 662         .close          = tpm_tis_spi_close,
 663         .get_desc       = tpm_tis_get_desc,
 664         .send           = tpm_tis_spi_send,
 665         .recv           = tpm_tis_spi_recv,
 666         .cleanup        = tpm_tis_spi_cleanup,
 667 };
 668
 669 static const struct tpm_tis_chip_data tpm_tis_std_chip_data = {
 670         .pcr_count = 24,
 671         .pcr_select_min = 3,
 672         .time_before_first_cmd_ms = 30,
 673 };
 674
 675 static const struct udevice_id tpm_tis_spi_ids[] = {
 676         {
 677                 .compatible = "tis,tpm2-spi",
 678                 .data = (ulong)&tpm_tis_std_chip_data,
 679         },
 680         { }
 681 };
 682
 683 U_BOOT_DRIVER(tpm_tis_spi) = {
 684         .name   = "tpm_tis_spi",
 685         .id     = UCLASS_TPM,
 686         .of_match = tpm_tis_spi_ids,
 687         .ops    = &tpm_tis_spi_ops,
 688         .probe  = tpm_tis_spi_probe,
 689         .remove = tpm_tis_spi_remove,
 690         .priv_auto_alloc_size = sizeof(struct tpm_chip),
 691 };