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