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->tpm_processing_cmd);
  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, sig;
 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         if (ibmvtpm->tpm_processing_cmd) {
 145                 dev_info(ibmvtpm->dev,
 146                          "Need to wait for TPM to finish\n");
 147                 /* wait for previous command to finish */
 148                 sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
 149                 if (sig)
 150                         return -EINTR;
 151         }
 152
 153         spin_lock(&ibmvtpm->rtce_lock);
 154         ibmvtpm->res_len = 0;
 155         memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
 156         crq.valid = (u8)IBMVTPM_VALID_CMD;
 157         crq.msg = (u8)VTPM_TPM_COMMAND;
 158         crq.len = cpu_to_be16(count);
 159         crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);
 160
 161         /*
 162          * set the processing flag before the Hcall, since we may get the
 163          * result (interrupt) before even being able to check rc.
 164          */
 165         ibmvtpm->tpm_processing_cmd = true;
 166
 167         rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
 168                               be64_to_cpu(word[1]));
 169         if (rc != H_SUCCESS) {
 170                 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
 171                 rc = 0;
 172                 ibmvtpm->tpm_processing_cmd = false;
 173         } else
 174                 rc = count;
 175
 176         spin_unlock(&ibmvtpm->rtce_lock);
 177         return rc;
 178 }
 179
 180 static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
 181 {
 182         return;
 183 }
 184
 185 static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
 186 {
 187         return 0;
 188 }
 189
 190 /**
 191  * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
 192  * @ibmvtpm:    vtpm device struct
 193  *
 194  * Return value:
 195  *      0 - Success
 196  *      Non-zero - Failure
 197  */
 198 static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
 199 {
 200         struct ibmvtpm_crq crq;
 201         u64 *buf = (u64 *) &crq;
 202         int rc;
 203
 204         crq.valid = (u8)IBMVTPM_VALID_CMD;
 205         crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
 206
 207         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 208                               cpu_to_be64(buf[1]));
 209         if (rc != H_SUCCESS)
 210                 dev_err(ibmvtpm->dev,
 211                         "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
 212
 213         return rc;
 214 }
 215
 216 /**
 217  * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
 218  *                         - Note that this is vtpm version and not tpm version
 219  * @ibmvtpm:    vtpm device struct
 220  *
 221  * Return value:
 222  *      0 - Success
 223  *      Non-zero - Failure
 224  */
 225 static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
 226 {
 227         struct ibmvtpm_crq crq;
 228         u64 *buf = (u64 *) &crq;
 229         int rc;
 230
 231         crq.valid = (u8)IBMVTPM_VALID_CMD;
 232         crq.msg = (u8)VTPM_GET_VERSION;
 233
 234         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 235                               cpu_to_be64(buf[1]));
 236         if (rc != H_SUCCESS)
 237                 dev_err(ibmvtpm->dev,
 238                         "ibmvtpm_crq_get_version failed rc=%d\n", rc);
 239
 240         return rc;
 241 }
 242
 243 /**
 244  * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete 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_complete(struct ibmvtpm_dev *ibmvtpm)
 252 {
 253         int rc;
 254
 255         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
 256         if (rc != H_SUCCESS)
 257                 dev_err(ibmvtpm->dev,
 258                         "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
 259
 260         return rc;
 261 }
 262
 263 /**
 264  * ibmvtpm_crq_send_init - Send a CRQ initialize message
 265  * @ibmvtpm:    vtpm device struct
 266  *
 267  * Return value:
 268  *      0 - Success
 269  *      Non-zero - Failure
 270  */
 271 static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
 272 {
 273         int rc;
 274
 275         rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
 276         if (rc != H_SUCCESS)
 277                 dev_err(ibmvtpm->dev,
 278                         "ibmvtpm_crq_send_init failed rc=%d\n", rc);
 279
 280         return rc;
 281 }
 282
 283 /**
 284  * tpm_ibmvtpm_remove - ibm vtpm remove entry point
 285  * @vdev:       vio device struct
 286  *
 287  * Return value:
 288  *      0
 289  */
 290 static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 291 {
 292         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 293         struct tpm_chip *chip = dev_get_drvdata(ibmvtpm->dev);
 294         int rc = 0;
 295
 296         tpm_chip_unregister(chip);
 297
 298         free_irq(vdev->irq, ibmvtpm);
 299
 300         do {
 301                 if (rc)
 302                         msleep(100);
 303                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 304         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 305
 306         dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
 307                          CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
 308         free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
 309
 310         if (ibmvtpm->rtce_buf) {
 311                 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
 312                                  ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
 313                 kfree(ibmvtpm->rtce_buf);
 314         }
 315
 316         kfree(ibmvtpm);
 317
 318         return 0;
 319 }
 320
 321 /**
 322  * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
 323  * @vdev:       vio device struct
 324  *
 325  * Return value:
 326  *      Number of bytes the driver needs to DMA map
 327  */
 328 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
 329 {
 330         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
 331
 332         /* ibmvtpm initializes at probe time, so the data we are
 333         * asking for may not be set yet. Estimate that 4K required
 334         * for TCE-mapped buffer in addition to CRQ.
 335         */
 336         if (!ibmvtpm)
 337                 return CRQ_RES_BUF_SIZE + PAGE_SIZE;
 338
 339         return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 340 }
 341
 342 /**
 343  * tpm_ibmvtpm_suspend - Suspend
 344  * @dev:        device struct
 345  *
 346  * Return value:
 347  *      0
 348  */
 349 static int tpm_ibmvtpm_suspend(struct device *dev)
 350 {
 351         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 352         struct ibmvtpm_crq crq;
 353         u64 *buf = (u64 *) &crq;
 354         int rc = 0;
 355
 356         crq.valid = (u8)IBMVTPM_VALID_CMD;
 357         crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
 358
 359         rc = ibmvtpm_send_crq(ibmvtpm->vdev, cpu_to_be64(buf[0]),
 360                               cpu_to_be64(buf[1]));
 361         if (rc != H_SUCCESS)
 362                 dev_err(ibmvtpm->dev,
 363                         "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
 364
 365         return rc;
 366 }
 367
 368 /**
 369  * ibmvtpm_reset_crq - Reset CRQ
 370  * @ibmvtpm:    ibm vtpm struct
 371  *
 372  * Return value:
 373  *      0 - Success
 374  *      Non-zero - Failure
 375  */
 376 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
 377 {
 378         int rc = 0;
 379
 380         do {
 381                 if (rc)
 382                         msleep(100);
 383                 rc = plpar_hcall_norets(H_FREE_CRQ,
 384                                         ibmvtpm->vdev->unit_address);
 385         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 386
 387         memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
 388         ibmvtpm->crq_queue.index = 0;
 389
 390         return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
 391                                   ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 392 }
 393
 394 /**
 395  * tpm_ibmvtpm_resume - Resume from suspend
 396  * @dev:        device struct
 397  *
 398  * Return value:
 399  *      0
 400  */
 401 static int tpm_ibmvtpm_resume(struct device *dev)
 402 {
 403         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 404         int rc = 0;
 405
 406         do {
 407                 if (rc)
 408                         msleep(100);
 409                 rc = plpar_hcall_norets(H_ENABLE_CRQ,
 410                                         ibmvtpm->vdev->unit_address);
 411         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 412
 413         if (rc) {
 414                 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
 415                 return rc;
 416         }
 417
 418         rc = vio_enable_interrupts(ibmvtpm->vdev);
 419         if (rc) {
 420                 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
 421                 return rc;
 422         }
 423
 424         rc = ibmvtpm_crq_send_init(ibmvtpm);
 425         if (rc)
 426                 dev_err(dev, "Error send_init rc=%d\n", rc);
 427
 428         return rc;
 429 }
 430
 431 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 432 {
 433         return (status == 0);
 434 }
 435
 436 static const struct tpm_class_ops tpm_ibmvtpm = {
 437         .recv = tpm_ibmvtpm_recv,
 438         .send = tpm_ibmvtpm_send,
 439         .cancel = tpm_ibmvtpm_cancel,
 440         .status = tpm_ibmvtpm_status,
 441         .req_complete_mask = 0,
 442         .req_complete_val = 0,
 443         .req_canceled = tpm_ibmvtpm_req_canceled,
 444 };
 445
 446 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
 447         .suspend = tpm_ibmvtpm_suspend,
 448         .resume = tpm_ibmvtpm_resume,
 449 };
 450
 451 /**
 452  * ibmvtpm_crq_get_next - Get next responded crq
 453  * @ibmvtpm     vtpm device struct
 454  *
 455  * Return value:
 456  *      vtpm crq pointer
 457  */
 458 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
 459 {
 460         struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
 461         struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
 462
 463         if (crq->valid & VTPM_MSG_RES) {
 464                 if (++crq_q->index == crq_q->num_entry)
 465                         crq_q->index = 0;
 466                 smp_rmb();
 467         } else
 468                 crq = NULL;
 469         return crq;
 470 }
 471
 472 /**
 473  * ibmvtpm_crq_process - Process responded crq
 474  * @crq         crq to be processed
 475  * @ibmvtpm     vtpm device struct
 476  *
 477  * Return value:
 478  *      Nothing
 479  */
 480 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 481                                 struct ibmvtpm_dev *ibmvtpm)
 482 {
 483         int rc = 0;
 484
 485         switch (crq->valid) {
 486         case VALID_INIT_CRQ:
 487                 switch (crq->msg) {
 488                 case INIT_CRQ_RES:
 489                         dev_info(ibmvtpm->dev, "CRQ initialized\n");
 490                         rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
 491                         if (rc)
 492                                 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
 493                         return;
 494                 case INIT_CRQ_COMP_RES:
 495                         dev_info(ibmvtpm->dev,
 496                                  "CRQ initialization completed\n");
 497                         return;
 498                 default:
 499                         dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
 500                         return;
 501                 }
 502         case IBMVTPM_VALID_CMD:
 503                 switch (crq->msg) {
 504                 case VTPM_GET_RTCE_BUFFER_SIZE_RES:
 505                         if (be16_to_cpu(crq->len) <= 0) {
 506                                 dev_err(ibmvtpm->dev, "Invalid rtce size\n");
 507                                 return;
 508                         }
 509                         ibmvtpm->rtce_size = be16_to_cpu(crq->len);
 510                         ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
 511                                                     GFP_ATOMIC);
 512                         if (!ibmvtpm->rtce_buf) {
 513                                 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
 514                                 return;
 515                         }
 516
 517                         ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
 518                                 ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
 519                                 DMA_BIDIRECTIONAL);
 520
 521                         if (dma_mapping_error(ibmvtpm->dev,
 522                                               ibmvtpm->rtce_dma_handle)) {
 523                                 kfree(ibmvtpm->rtce_buf);
 524                                 ibmvtpm->rtce_buf = NULL;
 525                                 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
 526                         }
 527
 528                         return;
 529                 case VTPM_GET_VERSION_RES:
 530                         ibmvtpm->vtpm_version = be32_to_cpu(crq->data);
 531                         return;
 532                 case VTPM_TPM_COMMAND_RES:
 533                         /* len of the data in rtce buffer */
 534                         ibmvtpm->res_len = be16_to_cpu(crq->len);
 535                         ibmvtpm->tpm_processing_cmd = false;
 536                         wake_up_interruptible(&ibmvtpm->wq);
 537                         return;
 538                 default:
 539                         return;
 540                 }
 541         }
 542         return;
 543 }
 544
 545 /**
 546  * ibmvtpm_interrupt -  Interrupt handler
 547  * @irq:                irq number to handle
 548  * @vtpm_instance:      vtpm that received interrupt
 549  *
 550  * Returns:
 551  *      IRQ_HANDLED
 552  **/
 553 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
 554 {
 555         struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
 556         struct ibmvtpm_crq *crq;
 557
 558         /* while loop is needed for initial setup (get version and
 559          * get rtce_size). There should be only one tpm request at any
 560          * given time.
 561          */
 562         while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
 563                 ibmvtpm_crq_process(crq, ibmvtpm);
 564                 crq->valid = 0;
 565                 smp_wmb();
 566         }
 567
 568         return IRQ_HANDLED;
 569 }
 570
 571 /**
 572  * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
 573  * @vio_dev:    vio device struct
 574  * @id:         vio device id struct
 575  *
 576  * Return value:
 577  *      0 - Success
 578  *      Non-zero - Failure
 579  */
 580 static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 581                                    const struct vio_device_id *id)
 582 {
 583         struct ibmvtpm_dev *ibmvtpm;
 584         struct device *dev = &vio_dev->dev;
 585         struct ibmvtpm_crq_queue *crq_q;
 586         struct tpm_chip *chip;
 587         int rc = -ENOMEM, rc1;
 588
 589         chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
 590         if (IS_ERR(chip))
 591                 return PTR_ERR(chip);
 592
 593         ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
 594         if (!ibmvtpm) {
 595                 dev_err(dev, "kzalloc for ibmvtpm failed\n");
 596                 goto cleanup;
 597         }
 598
 599         ibmvtpm->dev = dev;
 600         ibmvtpm->vdev = vio_dev;
 601
 602         crq_q = &ibmvtpm->crq_queue;
 603         crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
 604         if (!crq_q->crq_addr) {
 605                 dev_err(dev, "Unable to allocate memory for crq_addr\n");
 606                 goto cleanup;
 607         }
 608
 609         crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
 610         ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
 611                                                  CRQ_RES_BUF_SIZE,
 612                                                  DMA_BIDIRECTIONAL);
 613
 614         if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
 615                 dev_err(dev, "dma mapping failed\n");
 616                 goto cleanup;
 617         }
 618
 619         rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
 620                                 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 621         if (rc == H_RESOURCE)
 622                 rc = ibmvtpm_reset_crq(ibmvtpm);
 623
 624         if (rc) {
 625                 dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
 626                 goto reg_crq_cleanup;
 627         }
 628
 629         rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
 630                          tpm_ibmvtpm_driver_name, ibmvtpm);
 631         if (rc) {
 632                 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
 633                 goto init_irq_cleanup;
 634         }
 635
 636         rc = vio_enable_interrupts(vio_dev);
 637         if (rc) {
 638                 dev_err(dev, "Error %d enabling interrupts\n", rc);
 639                 goto init_irq_cleanup;
 640         }
 641
 642         init_waitqueue_head(&ibmvtpm->wq);
 643
 644         crq_q->index = 0;
 645
 646         TPM_VPRIV(chip) = (void *)ibmvtpm;
 647
 648         spin_lock_init(&ibmvtpm->rtce_lock);
 649
 650         rc = ibmvtpm_crq_send_init(ibmvtpm);
 651         if (rc)
 652                 goto init_irq_cleanup;
 653
 654         rc = ibmvtpm_crq_get_version(ibmvtpm);
 655         if (rc)
 656                 goto init_irq_cleanup;
 657
 658         rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
 659         if (rc)
 660                 goto init_irq_cleanup;
 661
 662         return tpm_chip_register(chip);
 663 init_irq_cleanup:
 664         do {
 665                 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
 666         } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
 667 reg_crq_cleanup:
 668         dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
 669                          DMA_BIDIRECTIONAL);
 670 cleanup:
 671         if (ibmvtpm) {
 672                 if (crq_q->crq_addr)
 673                         free_page((unsigned long)crq_q->crq_addr);
 674                 kfree(ibmvtpm);
 675         }
 676
 677         return rc;
 678 }
 679
 680 static struct vio_driver ibmvtpm_driver = {
 681         .id_table        = tpm_ibmvtpm_device_table,
 682         .probe           = tpm_ibmvtpm_probe,
 683         .remove          = tpm_ibmvtpm_remove,
 684         .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
 685         .name            = tpm_ibmvtpm_driver_name,
 686         .pm              = &tpm_ibmvtpm_pm_ops,
 687 };
 688
 689 /**
 690  * ibmvtpm_module_init - Initialize ibm vtpm module
 691  *
 692  * Return value:
 693  *      0 -Success
 694  *      Non-zero - Failure
 695  */
 696 static int __init ibmvtpm_module_init(void)
 697 {
 698         return vio_register_driver(&ibmvtpm_driver);
 699 }
 700
 701 /**
 702  * ibmvtpm_module_exit - Teardown ibm vtpm module
 703  *
 704  * Return value:
 705  *      Nothing
 706  */
 707 static void __exit ibmvtpm_module_exit(void)
 708 {
 709         vio_unregister_driver(&ibmvtpm_driver);
 710 }
 711
 712 module_init(ibmvtpm_module_init);
 713 module_exit(ibmvtpm_module_exit);
 714
 715 MODULE_AUTHOR("adlai@us.ibm.com");
 716 MODULE_DESCRIPTION("IBM vTPM Driver");
 717 MODULE_VERSION("1.0");
 718 MODULE_LICENSE("GPL");