kernel/drivers/char/tpm/tpm_ibmvtpm.c

   1 /*
   2  * Copyright (C) 2012 IBM Corporation
   3  *
   4  * Author: Ashley Lai <ashleydlai@gmail.com>
   5  *
   6  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
   7  *
   8  * Device driver for TCG/TCPA TPM (trusted platform module).
   9  * Specifications at www.trustedcomputinggroup.org
  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
  18 #include <linux/dma-mapping.h>
  19 #include <linux/dmapool.h>
  20 #include <linux/slab.h>
  21 #include <asm/vio.h>
  22 #include <asm/irq.h>
  23 #include <linux/types.h>
  24 #include <linux/list.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/wait.h>
  28 #include <asm/prom.h>
  29
  30 #include "tpm.h"
  31 #include "tpm_ibmvtpm.h"
  32
  33 static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
  34
  35 static struct vio_device_id tpm_ibmvtpm_device_table[] = {
  36         { "IBM,vtpm", "IBM,vtpm"},
  37         { "", "" }
  38 };
  39 MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
  40
  41 /**
  42  * ibmvtpm_send_crq - Send a CRQ request
  43  * @vdev:       vio device struct
  44  * @w1:         first word
  45  * @w2:         second word
  46  *
  47  * Return value:
  48  *      0 -Sucess
  49  *      Non-zero - Failure
  50  */
  51 static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
  52 {
  53         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
  54 }
  55
  56 /**
  57  * ibmvtpm_get_data - Retrieve ibm vtpm data
  58  * @dev:        device struct
  59  *
  60  * Return value:
  61  *      vtpm device struct
  62  */
  63 static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev)
  64 {
  65         struct tpm_chip *chip = dev_get_drvdata(dev);
  66         if (chip)
  67                 return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
  68         return NULL;
  69 }
  70
  71 /**
  72  * tpm_ibmvtpm_recv - Receive data after send
  73  * @chip:       tpm chip struct
  74  * @buf:        buffer to read
  75  * count:       size of buffer
  76  *
  77  * Return value:
  78  *      Number of bytes read
  79  */
  80 static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
  81 {
  82         struct ibmvtpm_dev *ibmvtpm;
  83         u16 len;
  84         int sig;
  85
  86         ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
  87
  88         if (!ibmvtpm->rtce_buf) {
  89                 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
  90                 return 0;
  91         }
  92
  93         sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0);
  94         if (sig)
  95                 return -EINTR;
  96
  97         len = ibmvtpm->res_len;
  98
  99         if (count < len) {
 100                 dev_err(ibmvtpm->dev,
 101                         "Invalid size in recv: count=%zd, crq_size=%d\n",
 102                         count, len);
 103                 return -EIO;
 104         }
 105
 106         spin_lock(&ibmvtpm->rtce_lock);
 107         memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
 108         memset(ibmvtpm->rtce_buf, 0, len);
 109         ibmvtpm->res_len = 0;
 110         spin_unlock(&ibmvtpm->rtce_lock);
 111         return len;
 112 }
 113
 114 /**
 115  * tpm_ibmvtpm_send - Send tpm request
 116  * @chip:       tpm chip struct
 117  * @buf:        buffer contains data to send
 118  * count:       size of buffer
 119  *
 120  * Return value:
 121  *      Number of bytes sent
 122  */
 123 static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 124 {
 125         struct ibmvtpm_dev *ibmvtpm;
 126         struct ibmvtpm_crq crq;
 127         __be64 *word = (__be64 *)&crq;
 128         int rc;
 129
 130         ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
 131
 132         if (!ibmvtpm->rtce_buf) {
 133                 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
 134                 return 0;
 135         }
 136
 137         if (count > ibmvtpm->rtce_size) {
 138                 dev_err(ibmvtpm->dev,
 139                         "Invalid size in send: count=%zd, rtce_size=%d\n",
 140                         count, ibmvtpm->rtce_size);
 141                 return -EIO;
 142         }
 143
 144         spin_lock(&ibmvtpm->rtce_lock);
 145         memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
 146         crq.valid = (u8)IBMVTPM_VALID_CMD;
 147         crq.msg = (u8)VTPM_TPM_COMMAND;
 148         crq.len = cpu_to_be16(count);
 149         crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);
 150
 151         rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
 152                               be64_to_cpu(word[1]));
 153         if (rc != H_SUCCESS) {
 154                 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
 155                 rc = 0;
 156         } else
 157                 rc = count;
 158
 159         spin_unlock(&ibmvtpm->rtce_lock);
 160         return rc;
 161 }
 162
 163 static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
 164 {
 165         return;
 166 }
 167
 168 static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
 169 {
 170         return 0;
 171 }
 172
 173 /**
 174  * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
 175  * @ibmvtpm:    vtpm device struct
 176  *
 177  * Return value:
 178  *      0 - Success
 179  *      Non-zero - Failure
 180  */
 181 static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
 182 {
 183         struct ibmvtpm_crq crq;
 184         u64 *buf = (u64 *) &crq;
 185         int rc;
 186
 187         crq.valid = (u8)IBMVTPM_VALID_CMD;
 188         crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
 189
 190         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 191                               cpu_to_be64(buf[1]));
 192         if (rc != H_SUCCESS)
 193                 dev_err(ibmvtpm->dev,
 194                         "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
 195
 196         return rc;
 197 }
 198
 199 /**
 200  * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
 201  *                         - Note that this is vtpm version and not tpm version
 202  * @ibmvtpm:    vtpm device struct
 203  *
 204  * Return value:
 205  *      0 - Success
 206  *      Non-zero - Failure
 207  */
 208 static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
 209 {
 210         struct ibmvtpm_crq crq;
 211         u64 *buf = (u64 *) &crq;
 212         int rc;
 213
 214         crq.valid = (u8)IBMVTPM_VALID_CMD;
 215         crq.msg = (u8)VTPM_GET_VERSION;
 216
 217         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 218                               cpu_to_be64(buf[1]));
 219         if (rc != H_SUCCESS)
 220                 dev_err(ibmvtpm->dev,
 221                         "ibmvtpm_crq_get_version failed rc=%d\n", rc);
 222
 223         return rc;
 224 }
 225
 226 /**
 227  * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
 228  * @ibmvtpm:    vtpm device struct
 229  *
 230  * Return value:
 231  *      0 - Success
 232  *      Non-zero - Failure
 233  */
 234 static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
 235 {
 236         int rc;
 237
 238         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
 239         if (rc != H_SUCCESS)
 240                 dev_err(ibmvtpm->dev,
 241                         "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
 242
 243         return rc;
 244 }
 245
 246 /**
 247  * ibmvtpm_crq_send_init - Send a CRQ initialize message
 248  * @ibmvtpm:    vtpm device struct
 249  *
 250  * Return value:
 251  *      0 - Success
 252  *      Non-zero - Failure
 253  */
 254 static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
 255 {
 256         int rc;
 257
 258         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
 259         if (rc != H_SUCCESS)
 260                 dev_err(ibmvtpm->dev,
 261                         "ibmvtpm_crq_send_init failed rc=%d\n", rc);
 262
 263         return rc;
 264 }
 265
 266 /**
 267  * tpm_ibmvtpm_remove - ibm vtpm remove entry point
 268  * @vdev:       vio device struct
 269  *
 270  * Return value:
 271  *      0
 272  */
 273 static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 274 {
 275         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 276         struct tpm_chip *chip = dev_get_drvdata(ibmvtpm->dev);
 277         int rc = 0;
 278
 279         tpm_chip_unregister(chip);
 280
 281         free_irq(vdev->irq, ibmvtpm);
 282
 283         do {
 284                 if (rc)
 285                         msleep(100);
 286                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 287         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 288
 289         dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
 290                          CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
 291         free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
 292
 293         if (ibmvtpm->rtce_buf) {
 294                 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
 295                                  ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
 296                 kfree(ibmvtpm->rtce_buf);
 297         }
 298
 299         kfree(ibmvtpm);
 300
 301         return 0;
 302 }
 303
 304 /**
 305  * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
 306  * @vdev:       vio device struct
 307  *
 308  * Return value:
 309  *      Number of bytes the driver needs to DMA map
 310  */
 311 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
 312 {
 313         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 314
 315         /* ibmvtpm initializes at probe time, so the data we are
 316         * asking for may not be set yet. Estimate that 4K required
 317         * for TCE-mapped buffer in addition to CRQ.
 318         */
 319         if (!ibmvtpm)
 320                 return CRQ_RES_BUF_SIZE + PAGE_SIZE;
 321
 322         return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 323 }
 324
 325 /**
 326  * tpm_ibmvtpm_suspend - Suspend
 327  * @dev:        device struct
 328  *
 329  * Return value:
 330  *      0
 331  */
 332 static int tpm_ibmvtpm_suspend(struct device *dev)
 333 {
 334         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 335         struct ibmvtpm_crq crq;
 336         u64 *buf = (u64 *) &crq;
 337         int rc = 0;
 338
 339         crq.valid = (u8)IBMVTPM_VALID_CMD;
 340         crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
 341
 342         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 343                               cpu_to_be64(buf[1]));
 344         if (rc != H_SUCCESS)
 345                 dev_err(ibmvtpm->dev,
 346                         "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
 347
 348         return rc;
 349 }
 350
 351 /**
 352  * ibmvtpm_reset_crq - Reset CRQ
 353  * @ibmvtpm:    ibm vtpm struct
 354  *
 355  * Return value:
 356  *      0 - Success
 357  *      Non-zero - Failure
 358  */
 359 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
 360 {
 361         int rc = 0;
 362
 363         do {
 364                 if (rc)
 365                         msleep(100);
 366                 rc = plpar_hcall_norets(H_FREE_CRQ,
 367                                         ibmvtpm->vdev->unit_address);
 368         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 369
 370         memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
 371         ibmvtpm->crq_queue.index = 0;
 372
 373         return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
 374                                   ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 375 }
 376
 377 /**
 378  * tpm_ibmvtpm_resume - Resume from suspend
 379  * @dev:        device struct
 380  *
 381  * Return value:
 382  *      0
 383  */
 384 static int tpm_ibmvtpm_resume(struct device *dev)
 385 {
 386         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 387         int rc = 0;
 388
 389         do {
 390                 if (rc)
 391                         msleep(100);
 392                 rc = plpar_hcall_norets(H_ENABLE_CRQ,
 393                                         ibmvtpm->vdev->unit_address);
 394         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 395
 396         if (rc) {
 397                 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
 398                 return rc;
 399         }
 400
 401         rc = vio_enable_interrupts(ibmvtpm->vdev);
 402         if (rc) {
 403                 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
 404                 return rc;
 405         }
 406
 407         rc = ibmvtpm_crq_send_init(ibmvtpm);
 408         if (rc)
 409                 dev_err(dev, "Error send_init rc=%d\n", rc);
 410
 411         return rc;
 412 }
 413
 414 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 415 {
 416         return (status == 0);
 417 }
 418
 419 static const struct tpm_class_ops tpm_ibmvtpm = {
 420         .recv = tpm_ibmvtpm_recv,
 421         .send = tpm_ibmvtpm_send,
 422         .cancel = tpm_ibmvtpm_cancel,
 423         .status = tpm_ibmvtpm_status,
 424         .req_complete_mask = 0,
 425         .req_complete_val = 0,
 426         .req_canceled = tpm_ibmvtpm_req_canceled,
 427 };
 428
 429 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
 430         .suspend = tpm_ibmvtpm_suspend,
 431         .resume = tpm_ibmvtpm_resume,
 432 };
 433
 434 /**
 435  * ibmvtpm_crq_get_next - Get next responded crq
 436  * @ibmvtpm     vtpm device struct
 437  *
 438  * Return value:
 439  *      vtpm crq pointer
 440  */
 441 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
 442 {
 443         struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
 444         struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
 445
 446         if (crq->valid & VTPM_MSG_RES) {
 447                 if (++crq_q->index == crq_q->num_entry)
 448                         crq_q->index = 0;
 449                 smp_rmb();
 450         } else
 451                 crq = NULL;
 452         return crq;
 453 }
 454
 455 /**
 456  * ibmvtpm_crq_process - Process responded crq
 457  * @crq         crq to be processed
 458  * @ibmvtpm     vtpm device struct
 459  *
 460  * Return value:
 461  *      Nothing
 462  */
 463 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 464                                 struct ibmvtpm_dev *ibmvtpm)
 465 {
 466         int rc = 0;
 467
 468         switch (crq->valid) {
 469         case VALID_INIT_CRQ:
 470                 switch (crq->msg) {
 471                 case INIT_CRQ_RES:
 472                         dev_info(ibmvtpm->dev, "CRQ initialized\n");
 473                         rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
 474                         if (rc)
 475                                 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
 476                         return;
 477                 case INIT_CRQ_COMP_RES:
 478                         dev_info(ibmvtpm->dev,
 479                                  "CRQ initialization completed\n");
 480                         return;
 481                 default:
 482                         dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
 483                         return;
 484                 }
 485         case IBMVTPM_VALID_CMD:
 486                 switch (crq->msg) {
 487                 case VTPM_GET_RTCE_BUFFER_SIZE_RES:
 488                         if (be16_to_cpu(crq->len) <= 0) {
 489                                 dev_err(ibmvtpm->dev, "Invalid rtce size\n");
 490                                 return;
 491                         }
 492                         ibmvtpm->rtce_size = be16_to_cpu(crq->len);
 493                         ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
 494                                                     GFP_KERNEL);
 495                         if (!ibmvtpm->rtce_buf) {
 496                                 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
 497                                 return;
 498                         }
 499
 500                         ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
 501                                 ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
 502                                 DMA_BIDIRECTIONAL);
 503
 504                         if (dma_mapping_error(ibmvtpm->dev,
 505                                               ibmvtpm->rtce_dma_handle)) {
 506                                 kfree(ibmvtpm->rtce_buf);
 507                                 ibmvtpm->rtce_buf = NULL;
 508                                 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
 509                         }
 510
 511                         return;
 512                 case VTPM_GET_VERSION_RES:
 513                         ibmvtpm->vtpm_version = be32_to_cpu(crq->data);
 514                         return;
 515                 case VTPM_TPM_COMMAND_RES:
 516                         /* len of the data in rtce buffer */
 517                         ibmvtpm->res_len = be16_to_cpu(crq->len);
 518                         wake_up_interruptible(&ibmvtpm->wq);
 519                         return;
 520                 default:
 521                         return;
 522                 }
 523         }
 524         return;
 525 }
 526
 527 /**
 528  * ibmvtpm_interrupt -  Interrupt handler
 529  * @irq:                irq number to handle
 530  * @vtpm_instance:      vtpm that received interrupt
 531  *
 532  * Returns:
 533  *      IRQ_HANDLED
 534  **/
 535 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
 536 {
 537         struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
 538         struct ibmvtpm_crq *crq;
 539
 540         /* while loop is needed for initial setup (get version and
 541          * get rtce_size). There should be only one tpm request at any
 542          * given time.
 543          */
 544         while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
 545                 ibmvtpm_crq_process(crq, ibmvtpm);
 546                 crq->valid = 0;
 547                 smp_wmb();
 548         }
 549
 550         return IRQ_HANDLED;
 551 }
 552
 553 /**
 554  * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
 555  * @vio_dev:    vio device struct
 556  * @id:         vio device id struct
 557  *
 558  * Return value:
 559  *      0 - Success
 560  *      Non-zero - Failure
 561  */
 562 static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 563                                    const struct vio_device_id *id)
 564 {
 565         struct ibmvtpm_dev *ibmvtpm;
 566         struct device *dev = &vio_dev->dev;
 567         struct ibmvtpm_crq_queue *crq_q;
 568         struct tpm_chip *chip;
 569         int rc = -ENOMEM, rc1;
 570
 571         chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
 572         if (IS_ERR(chip))
 573                 return PTR_ERR(chip);
 574
 575         ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
 576         if (!ibmvtpm) {
 577                 dev_err(dev, "kzalloc for ibmvtpm failed\n");
 578                 goto cleanup;
 579         }
 580
 581         crq_q = &ibmvtpm->crq_queue;
 582         crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
 583         if (!crq_q->crq_addr) {
 584                 dev_err(dev, "Unable to allocate memory for crq_addr\n");
 585                 goto cleanup;
 586         }
 587
 588         crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
 589         ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
 590                                                  CRQ_RES_BUF_SIZE,
 591                                                  DMA_BIDIRECTIONAL);
 592
 593         if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
 594                 dev_err(dev, "dma mapping failed\n");
 595                 goto cleanup;
 596         }
 597
 598         rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
 599                                 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 600         if (rc == H_RESOURCE)
 601                 rc = ibmvtpm_reset_crq(ibmvtpm);
 602
 603         if (rc) {
 604                 dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
 605                 goto reg_crq_cleanup;
 606         }
 607
 608         rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
 609                          tpm_ibmvtpm_driver_name, ibmvtpm);
 610         if (rc) {
 611                 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
 612                 goto init_irq_cleanup;
 613         }
 614
 615         rc = vio_enable_interrupts(vio_dev);
 616         if (rc) {
 617                 dev_err(dev, "Error %d enabling interrupts\n", rc);
 618                 goto init_irq_cleanup;
 619         }
 620
 621         init_waitqueue_head(&ibmvtpm->wq);
 622
 623         crq_q->index = 0;
 624
 625         ibmvtpm->dev = dev;
 626         ibmvtpm->vdev = vio_dev;
 627         TPM_VPRIV(chip) = (void *)ibmvtpm;
 628
 629         spin_lock_init(&ibmvtpm->rtce_lock);
 630
 631         rc = ibmvtpm_crq_send_init(ibmvtpm);
 632         if (rc)
 633                 goto init_irq_cleanup;
 634
 635         rc = ibmvtpm_crq_get_version(ibmvtpm);
 636         if (rc)
 637                 goto init_irq_cleanup;
 638
 639         rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
 640         if (rc)
 641                 goto init_irq_cleanup;
 642
 643         return tpm_chip_register(chip);
 644 init_irq_cleanup:
 645         do {
 646                 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
 647         } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
 648 reg_crq_cleanup:
 649         dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
 650                          DMA_BIDIRECTIONAL);
 651 cleanup:
 652         if (ibmvtpm) {
 653                 if (crq_q->crq_addr)
 654                         free_page((unsigned long)crq_q->crq_addr);
 655                 kfree(ibmvtpm);
 656         }
 657
 658         return rc;
 659 }
 660
 661 static struct vio_driver ibmvtpm_driver = {
 662         .id_table        = tpm_ibmvtpm_device_table,
 663         .probe           = tpm_ibmvtpm_probe,
 664         .remove          = tpm_ibmvtpm_remove,
 665         .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
 666         .name            = tpm_ibmvtpm_driver_name,
 667         .pm              = &tpm_ibmvtpm_pm_ops,
 668 };
 669
 670 /**
 671  * ibmvtpm_module_init - Initialize ibm vtpm module
 672  *
 673  * Return value:
 674  *      0 -Success
 675  *      Non-zero - Failure
 676  */
 677 static int __init ibmvtpm_module_init(void)
 678 {
 679         return vio_register_driver(&ibmvtpm_driver);
 680 }
 681
 682 /**
 683  * ibmvtpm_module_exit - Teardown ibm vtpm module
 684  *
 685  * Return value:
 686  *      Nothing
 687  */
 688 static void __exit ibmvtpm_module_exit(void)
 689 {
 690         vio_unregister_driver(&ibmvtpm_driver);
 691 }
 692
 693 module_init(ibmvtpm_module_init);
 694 module_exit(ibmvtpm_module_exit);
 695
 696 MODULE_AUTHOR("adlai@us.ibm.com");
 697 MODULE_DESCRIPTION("IBM vTPM Driver");
 698 MODULE_VERSION("1.0");
 699 MODULE_LICENSE("GPL");