drivers/char/tpm/tpm_ibmvtpm.c

   1 /*
   2  * Copyright (C) 2012 IBM Corporation
   3  *
   4  * Author: Ashley Lai <adlai@us.ibm.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         u64 *word = (u64 *) &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 = (u16)count;
 149         crq.data = ibmvtpm->rtce_dma_handle;
 150
 151         rc = ibmvtpm_send_crq(ibmvtpm->vdev, word[0], word[1]);
 152         if (rc != H_SUCCESS) {
 153                 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
 154                 rc = 0;
 155         } else
 156                 rc = count;
 157
 158         spin_unlock(&ibmvtpm->rtce_lock);
 159         return rc;
 160 }
 161
 162 static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
 163 {
 164         return;
 165 }
 166
 167 static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
 168 {
 169         return 0;
 170 }
 171
 172 /**
 173  * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
 174  * @ibmvtpm:    vtpm device struct
 175  *
 176  * Return value:
 177  *      0 - Success
 178  *      Non-zero - Failure
 179  */
 180 static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
 181 {
 182         struct ibmvtpm_crq crq;
 183         u64 *buf = (u64 *) &crq;
 184         int rc;
 185
 186         crq.valid = (u8)IBMVTPM_VALID_CMD;
 187         crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
 188
 189         rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
 190         if (rc != H_SUCCESS)
 191                 dev_err(ibmvtpm->dev,
 192                         "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
 193
 194         return rc;
 195 }
 196
 197 /**
 198  * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
 199  *                         - Note that this is vtpm version and not tpm version
 200  * @ibmvtpm:    vtpm device struct
 201  *
 202  * Return value:
 203  *      0 - Success
 204  *      Non-zero - Failure
 205  */
 206 static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
 207 {
 208         struct ibmvtpm_crq crq;
 209         u64 *buf = (u64 *) &crq;
 210         int rc;
 211
 212         crq.valid = (u8)IBMVTPM_VALID_CMD;
 213         crq.msg = (u8)VTPM_GET_VERSION;
 214
 215         rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
 216         if (rc != H_SUCCESS)
 217                 dev_err(ibmvtpm->dev,
 218                         "ibmvtpm_crq_get_version failed rc=%d\n", rc);
 219
 220         return rc;
 221 }
 222
 223 /**
 224  * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
 225  * @ibmvtpm:    vtpm device struct
 226  *
 227  * Return value:
 228  *      0 - Success
 229  *      Non-zero - Failure
 230  */
 231 static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
 232 {
 233         int rc;
 234
 235         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
 236         if (rc != H_SUCCESS)
 237                 dev_err(ibmvtpm->dev,
 238                         "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
 239
 240         return rc;
 241 }
 242
 243 /**
 244  * ibmvtpm_crq_send_init - Send a CRQ initialize message
 245  * @ibmvtpm:    vtpm device struct
 246  *
 247  * Return value:
 248  *      0 - Success
 249  *      Non-zero - Failure
 250  */
 251 static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
 252 {
 253         int rc;
 254
 255         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
 256         if (rc != H_SUCCESS)
 257                 dev_err(ibmvtpm->dev,
 258                         "ibmvtpm_crq_send_init failed rc=%d\n", rc);
 259
 260         return rc;
 261 }
 262
 263 /**
 264  * tpm_ibmvtpm_remove - ibm vtpm remove entry point
 265  * @vdev:       vio device struct
 266  *
 267  * Return value:
 268  *      0
 269  */
 270 static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 271 {
 272         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 273         int rc = 0;
 274
 275         free_irq(vdev->irq, ibmvtpm);
 276
 277         do {
 278                 if (rc)
 279                         msleep(100);
 280                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 281         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 282
 283         dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
 284                          CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
 285         free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
 286
 287         if (ibmvtpm->rtce_buf) {
 288                 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
 289                                  ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
 290                 kfree(ibmvtpm->rtce_buf);
 291         }
 292
 293         tpm_remove_hardware(ibmvtpm->dev);
 294
 295         kfree(ibmvtpm);
 296
 297         return 0;
 298 }
 299
 300 /**
 301  * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
 302  * @vdev:       vio device struct
 303  *
 304  * Return value:
 305  *      Number of bytes the driver needs to DMA map
 306  */
 307 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
 308 {
 309         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 310         return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 311 }
 312
 313 /**
 314  * tpm_ibmvtpm_suspend - Suspend
 315  * @dev:        device struct
 316  *
 317  * Return value:
 318  *      0
 319  */
 320 static int tpm_ibmvtpm_suspend(struct device *dev)
 321 {
 322         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 323         struct ibmvtpm_crq crq;
 324         u64 *buf = (u64 *) &crq;
 325         int rc = 0;
 326
 327         crq.valid = (u8)IBMVTPM_VALID_CMD;
 328         crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
 329
 330         rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
 331         if (rc != H_SUCCESS)
 332                 dev_err(ibmvtpm->dev,
 333                         "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
 334
 335         return rc;
 336 }
 337
 338 /**
 339  * ibmvtpm_reset_crq - Reset CRQ
 340  * @ibmvtpm:    ibm vtpm struct
 341  *
 342  * Return value:
 343  *      0 - Success
 344  *      Non-zero - Failure
 345  */
 346 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
 347 {
 348         int rc = 0;
 349
 350         do {
 351                 if (rc)
 352                         msleep(100);
 353                 rc = plpar_hcall_norets(H_FREE_CRQ,
 354                                         ibmvtpm->vdev->unit_address);
 355         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 356
 357         memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
 358         ibmvtpm->crq_queue.index = 0;
 359
 360         return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
 361                                   ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 362 }
 363
 364 /**
 365  * tpm_ibmvtpm_resume - Resume from suspend
 366  * @dev:        device struct
 367  *
 368  * Return value:
 369  *      0
 370  */
 371 static int tpm_ibmvtpm_resume(struct device *dev)
 372 {
 373         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 374         int rc = 0;
 375
 376         do {
 377                 if (rc)
 378                         msleep(100);
 379                 rc = plpar_hcall_norets(H_ENABLE_CRQ,
 380                                         ibmvtpm->vdev->unit_address);
 381         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 382
 383         if (rc) {
 384                 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
 385                 return rc;
 386         }
 387
 388         rc = vio_enable_interrupts(ibmvtpm->vdev);
 389         if (rc) {
 390                 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
 391                 return rc;
 392         }
 393
 394         rc = ibmvtpm_crq_send_init(ibmvtpm);
 395         if (rc)
 396                 dev_err(dev, "Error send_init rc=%d\n", rc);
 397
 398         return rc;
 399 }
 400
 401 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 402 {
 403         return (status == 0);
 404 }
 405
 406 static const struct tpm_vendor_specific tpm_ibmvtpm = {
 407         .recv = tpm_ibmvtpm_recv,
 408         .send = tpm_ibmvtpm_send,
 409         .cancel = tpm_ibmvtpm_cancel,
 410         .status = tpm_ibmvtpm_status,
 411         .req_complete_mask = 0,
 412         .req_complete_val = 0,
 413         .req_canceled = tpm_ibmvtpm_req_canceled,
 414 };
 415
 416 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
 417         .suspend = tpm_ibmvtpm_suspend,
 418         .resume = tpm_ibmvtpm_resume,
 419 };
 420
 421 /**
 422  * ibmvtpm_crq_get_next - Get next responded crq
 423  * @ibmvtpm     vtpm device struct
 424  *
 425  * Return value:
 426  *      vtpm crq pointer
 427  */
 428 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
 429 {
 430         struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
 431         struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
 432
 433         if (crq->valid & VTPM_MSG_RES) {
 434                 if (++crq_q->index == crq_q->num_entry)
 435                         crq_q->index = 0;
 436                 smp_rmb();
 437         } else
 438                 crq = NULL;
 439         return crq;
 440 }
 441
 442 /**
 443  * ibmvtpm_crq_process - Process responded crq
 444  * @crq         crq to be processed
 445  * @ibmvtpm     vtpm device struct
 446  *
 447  * Return value:
 448  *      Nothing
 449  */
 450 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 451                                 struct ibmvtpm_dev *ibmvtpm)
 452 {
 453         int rc = 0;
 454
 455         switch (crq->valid) {
 456         case VALID_INIT_CRQ:
 457                 switch (crq->msg) {
 458                 case INIT_CRQ_RES:
 459                         dev_info(ibmvtpm->dev, "CRQ initialized\n");
 460                         rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
 461                         if (rc)
 462                                 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
 463                         return;
 464                 case INIT_CRQ_COMP_RES:
 465                         dev_info(ibmvtpm->dev,
 466                                  "CRQ initialization completed\n");
 467                         return;
 468                 default:
 469                         dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
 470                         return;
 471                 }
 472         case IBMVTPM_VALID_CMD:
 473                 switch (crq->msg) {
 474                 case VTPM_GET_RTCE_BUFFER_SIZE_RES:
 475                         if (crq->len <= 0) {
 476                                 dev_err(ibmvtpm->dev, "Invalid rtce size\n");
 477                                 return;
 478                         }
 479                         ibmvtpm->rtce_size = crq->len;
 480                         ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
 481                                                     GFP_KERNEL);
 482                         if (!ibmvtpm->rtce_buf) {
 483                                 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
 484                                 return;
 485                         }
 486
 487                         ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
 488                                 ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
 489                                 DMA_BIDIRECTIONAL);
 490
 491                         if (dma_mapping_error(ibmvtpm->dev,
 492                                               ibmvtpm->rtce_dma_handle)) {
 493                                 kfree(ibmvtpm->rtce_buf);
 494                                 ibmvtpm->rtce_buf = NULL;
 495                                 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
 496                         }
 497
 498                         return;
 499                 case VTPM_GET_VERSION_RES:
 500                         ibmvtpm->vtpm_version = crq->data;
 501                         return;
 502                 case VTPM_TPM_COMMAND_RES:
 503                         /* len of the data in rtce buffer */
 504                         ibmvtpm->res_len = crq->len;
 505                         wake_up_interruptible(&ibmvtpm->wq);
 506                         return;
 507                 default:
 508                         return;
 509                 }
 510         }
 511         return;
 512 }
 513
 514 /**
 515  * ibmvtpm_interrupt -  Interrupt handler
 516  * @irq:                irq number to handle
 517  * @vtpm_instance:      vtpm that received interrupt
 518  *
 519  * Returns:
 520  *      IRQ_HANDLED
 521  **/
 522 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
 523 {
 524         struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
 525         struct ibmvtpm_crq *crq;
 526
 527         /* while loop is needed for initial setup (get version and
 528          * get rtce_size). There should be only one tpm request at any
 529          * given time.
 530          */
 531         while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
 532                 ibmvtpm_crq_process(crq, ibmvtpm);
 533                 crq->valid = 0;
 534                 smp_wmb();
 535         }
 536
 537         return IRQ_HANDLED;
 538 }
 539
 540 /**
 541  * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
 542  * @vio_dev:    vio device struct
 543  * @id:         vio device id struct
 544  *
 545  * Return value:
 546  *      0 - Success
 547  *      Non-zero - Failure
 548  */
 549 static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 550                                    const struct vio_device_id *id)
 551 {
 552         struct ibmvtpm_dev *ibmvtpm;
 553         struct device *dev = &vio_dev->dev;
 554         struct ibmvtpm_crq_queue *crq_q;
 555         struct tpm_chip *chip;
 556         int rc = -ENOMEM, rc1;
 557
 558         chip = tpm_register_hardware(dev, &tpm_ibmvtpm);
 559         if (!chip) {
 560                 dev_err(dev, "tpm_register_hardware failed\n");
 561                 return -ENODEV;
 562         }
 563
 564         ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
 565         if (!ibmvtpm) {
 566                 dev_err(dev, "kzalloc for ibmvtpm failed\n");
 567                 goto cleanup;
 568         }
 569
 570         crq_q = &ibmvtpm->crq_queue;
 571         crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
 572         if (!crq_q->crq_addr) {
 573                 dev_err(dev, "Unable to allocate memory for crq_addr\n");
 574                 goto cleanup;
 575         }
 576
 577         crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
 578         ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
 579                                                  CRQ_RES_BUF_SIZE,
 580                                                  DMA_BIDIRECTIONAL);
 581
 582         if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
 583                 dev_err(dev, "dma mapping failed\n");
 584                 goto cleanup;
 585         }
 586
 587         rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
 588                                 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 589         if (rc == H_RESOURCE)
 590                 rc = ibmvtpm_reset_crq(ibmvtpm);
 591
 592         if (rc) {
 593                 dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
 594                 goto reg_crq_cleanup;
 595         }
 596
 597         rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
 598                          tpm_ibmvtpm_driver_name, ibmvtpm);
 599         if (rc) {
 600                 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
 601                 goto init_irq_cleanup;
 602         }
 603
 604         rc = vio_enable_interrupts(vio_dev);
 605         if (rc) {
 606                 dev_err(dev, "Error %d enabling interrupts\n", rc);
 607                 goto init_irq_cleanup;
 608         }
 609
 610         init_waitqueue_head(&ibmvtpm->wq);
 611
 612         crq_q->index = 0;
 613
 614         ibmvtpm->dev = dev;
 615         ibmvtpm->vdev = vio_dev;
 616         TPM_VPRIV(chip) = (void *)ibmvtpm;
 617
 618         spin_lock_init(&ibmvtpm->rtce_lock);
 619
 620         rc = ibmvtpm_crq_send_init(ibmvtpm);
 621         if (rc)
 622                 goto init_irq_cleanup;
 623
 624         rc = ibmvtpm_crq_get_version(ibmvtpm);
 625         if (rc)
 626                 goto init_irq_cleanup;
 627
 628         rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
 629         if (rc)
 630                 goto init_irq_cleanup;
 631
 632         return rc;
 633 init_irq_cleanup:
 634         do {
 635                 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
 636         } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
 637 reg_crq_cleanup:
 638         dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
 639                          DMA_BIDIRECTIONAL);
 640 cleanup:
 641         if (ibmvtpm) {
 642                 if (crq_q->crq_addr)
 643                         free_page((unsigned long)crq_q->crq_addr);
 644                 kfree(ibmvtpm);
 645         }
 646
 647         tpm_remove_hardware(dev);
 648
 649         return rc;
 650 }
 651
 652 static struct vio_driver ibmvtpm_driver = {
 653         .id_table        = tpm_ibmvtpm_device_table,
 654         .probe           = tpm_ibmvtpm_probe,
 655         .remove          = tpm_ibmvtpm_remove,
 656         .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
 657         .name            = tpm_ibmvtpm_driver_name,
 658         .pm              = &tpm_ibmvtpm_pm_ops,
 659 };
 660
 661 /**
 662  * ibmvtpm_module_init - Initialize ibm vtpm module
 663  *
 664  * Return value:
 665  *      0 -Success
 666  *      Non-zero - Failure
 667  */
 668 static int __init ibmvtpm_module_init(void)
 669 {
 670         return vio_register_driver(&ibmvtpm_driver);
 671 }
 672
 673 /**
 674  * ibmvtpm_module_exit - Teardown ibm vtpm module
 675  *
 676  * Return value:
 677  *      Nothing
 678  */
 679 static void __exit ibmvtpm_module_exit(void)
 680 {
 681         vio_unregister_driver(&ibmvtpm_driver);
 682 }
 683
 684 module_init(ibmvtpm_module_init);
 685 module_exit(ibmvtpm_module_exit);
 686
 687 MODULE_AUTHOR("adlai@us.ibm.com");
 688 MODULE_DESCRIPTION("IBM vTPM Driver");
 689 MODULE_VERSION("1.0");
 690 MODULE_LICENSE("GPL");