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=%ld, 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=%ld, 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
 311         /* ibmvtpm initializes at probe time, so the data we are
 312         * asking for may not be set yet. Estimate that 4K required
 313         * for TCE-mapped buffer in addition to CRQ.
 314         */
 315         if (!ibmvtpm)
 316                 return CRQ_RES_BUF_SIZE + PAGE_SIZE;
 317
 318         return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 319 }
 320
 321 /**
 322  * tpm_ibmvtpm_suspend - Suspend
 323  * @dev:        device struct
 324  *
 325  * Return value:
 326  *      0
 327  */
 328 static int tpm_ibmvtpm_suspend(struct device *dev)
 329 {
 330         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 331         struct ibmvtpm_crq crq;
 332         u64 *buf = (u64 *) &crq;
 333         int rc = 0;
 334
 335         crq.valid = (u8)IBMVTPM_VALID_CMD;
 336         crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
 337
 338         rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
 339         if (rc != H_SUCCESS)
 340                 dev_err(ibmvtpm->dev,
 341                         "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
 342
 343         return rc;
 344 }
 345
 346 /**
 347  * ibmvtpm_reset_crq - Reset CRQ
 348  * @ibmvtpm:    ibm vtpm struct
 349  *
 350  * Return value:
 351  *      0 - Success
 352  *      Non-zero - Failure
 353  */
 354 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
 355 {
 356         int rc = 0;
 357
 358         do {
 359                 if (rc)
 360                         msleep(100);
 361                 rc = plpar_hcall_norets(H_FREE_CRQ,
 362                                         ibmvtpm->vdev->unit_address);
 363         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 364
 365         memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
 366         ibmvtpm->crq_queue.index = 0;
 367
 368         return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
 369                                   ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 370 }
 371
 372 /**
 373  * tpm_ibmvtpm_resume - Resume from suspend
 374  * @dev:        device struct
 375  *
 376  * Return value:
 377  *      0
 378  */
 379 static int tpm_ibmvtpm_resume(struct device *dev)
 380 {
 381         struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
 382         int rc = 0;
 383
 384         do {
 385                 if (rc)
 386                         msleep(100);
 387                 rc = plpar_hcall_norets(H_ENABLE_CRQ,
 388                                         ibmvtpm->vdev->unit_address);
 389         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 390
 391         if (rc) {
 392                 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
 393                 return rc;
 394         }
 395
 396         rc = vio_enable_interrupts(ibmvtpm->vdev);
 397         if (rc) {
 398                 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
 399                 return rc;
 400         }
 401
 402         rc = ibmvtpm_crq_send_init(ibmvtpm);
 403         if (rc)
 404                 dev_err(dev, "Error send_init rc=%d\n", rc);
 405
 406         return rc;
 407 }
 408
 409 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
 410 {
 411         return (status == 0);
 412 }
 413
 414 static const struct file_operations ibmvtpm_ops = {
 415         .owner = THIS_MODULE,
 416         .llseek = no_llseek,
 417         .open = tpm_open,
 418         .read = tpm_read,
 419         .write = tpm_write,
 420         .release = tpm_release,
 421 };
 422
 423 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
 424 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
 425 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
 426 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
 427 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
 428 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 429                    NULL);
 430 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 431 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 432 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
 433 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 434
 435 static struct attribute *ibmvtpm_attrs[] = {
 436         &dev_attr_pubek.attr,
 437         &dev_attr_pcrs.attr,
 438         &dev_attr_enabled.attr,
 439         &dev_attr_active.attr,
 440         &dev_attr_owned.attr,
 441         &dev_attr_temp_deactivated.attr,
 442         &dev_attr_caps.attr,
 443         &dev_attr_cancel.attr,
 444         &dev_attr_durations.attr,
 445         &dev_attr_timeouts.attr, NULL,
 446 };
 447
 448 static struct attribute_group ibmvtpm_attr_grp = { .attrs = ibmvtpm_attrs };
 449
 450 static const struct tpm_vendor_specific tpm_ibmvtpm = {
 451         .recv = tpm_ibmvtpm_recv,
 452         .send = tpm_ibmvtpm_send,
 453         .cancel = tpm_ibmvtpm_cancel,
 454         .status = tpm_ibmvtpm_status,
 455         .req_complete_mask = 0,
 456         .req_complete_val = 0,
 457         .req_canceled = tpm_ibmvtpm_req_canceled,
 458         .attr_group = &ibmvtpm_attr_grp,
 459         .miscdev = { .fops = &ibmvtpm_ops, },
 460 };
 461
 462 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
 463         .suspend = tpm_ibmvtpm_suspend,
 464         .resume = tpm_ibmvtpm_resume,
 465 };
 466
 467 /**
 468  * ibmvtpm_crq_get_next - Get next responded crq
 469  * @ibmvtpm     vtpm device struct
 470  *
 471  * Return value:
 472  *      vtpm crq pointer
 473  */
 474 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
 475 {
 476         struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
 477         struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
 478
 479         if (crq->valid & VTPM_MSG_RES) {
 480                 if (++crq_q->index == crq_q->num_entry)
 481                         crq_q->index = 0;
 482                 smp_rmb();
 483         } else
 484                 crq = NULL;
 485         return crq;
 486 }
 487
 488 /**
 489  * ibmvtpm_crq_process - Process responded crq
 490  * @crq         crq to be processed
 491  * @ibmvtpm     vtpm device struct
 492  *
 493  * Return value:
 494  *      Nothing
 495  */
 496 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
 497                                 struct ibmvtpm_dev *ibmvtpm)
 498 {
 499         int rc = 0;
 500
 501         switch (crq->valid) {
 502         case VALID_INIT_CRQ:
 503                 switch (crq->msg) {
 504                 case INIT_CRQ_RES:
 505                         dev_info(ibmvtpm->dev, "CRQ initialized\n");
 506                         rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
 507                         if (rc)
 508                                 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
 509                         return;
 510                 case INIT_CRQ_COMP_RES:
 511                         dev_info(ibmvtpm->dev,
 512                                  "CRQ initialization completed\n");
 513                         return;
 514                 default:
 515                         dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
 516                         return;
 517                 }
 518                 return;
 519         case IBMVTPM_VALID_CMD:
 520                 switch (crq->msg) {
 521                 case VTPM_GET_RTCE_BUFFER_SIZE_RES:
 522                         if (crq->len <= 0) {
 523                                 dev_err(ibmvtpm->dev, "Invalid rtce size\n");
 524                                 return;
 525                         }
 526                         ibmvtpm->rtce_size = crq->len;
 527                         ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
 528                                                     GFP_KERNEL);
 529                         if (!ibmvtpm->rtce_buf) {
 530                                 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
 531                                 return;
 532                         }
 533
 534                         ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
 535                                 ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
 536                                 DMA_BIDIRECTIONAL);
 537
 538                         if (dma_mapping_error(ibmvtpm->dev,
 539                                               ibmvtpm->rtce_dma_handle)) {
 540                                 kfree(ibmvtpm->rtce_buf);
 541                                 ibmvtpm->rtce_buf = NULL;
 542                                 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
 543                         }
 544
 545                         return;
 546                 case VTPM_GET_VERSION_RES:
 547                         ibmvtpm->vtpm_version = crq->data;
 548                         return;
 549                 case VTPM_TPM_COMMAND_RES:
 550                         /* len of the data in rtce buffer */
 551                         ibmvtpm->res_len = crq->len;
 552                         wake_up_interruptible(&ibmvtpm->wq);
 553                         return;
 554                 default:
 555                         return;
 556                 }
 557         }
 558         return;
 559 }
 560
 561 /**
 562  * ibmvtpm_interrupt -  Interrupt handler
 563  * @irq:                irq number to handle
 564  * @vtpm_instance:      vtpm that received interrupt
 565  *
 566  * Returns:
 567  *      IRQ_HANDLED
 568  **/
 569 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
 570 {
 571         struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
 572         struct ibmvtpm_crq *crq;
 573
 574         /* while loop is needed for initial setup (get version and
 575          * get rtce_size). There should be only one tpm request at any
 576          * given time.
 577          */
 578         while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
 579                 ibmvtpm_crq_process(crq, ibmvtpm);
 580                 crq->valid = 0;
 581                 smp_wmb();
 582         }
 583
 584         return IRQ_HANDLED;
 585 }
 586
 587 /**
 588  * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
 589  * @vio_dev:    vio device struct
 590  * @id:         vio device id struct
 591  *
 592  * Return value:
 593  *      0 - Success
 594  *      Non-zero - Failure
 595  */
 596 static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
 597                                    const struct vio_device_id *id)
 598 {
 599         struct ibmvtpm_dev *ibmvtpm;
 600         struct device *dev = &vio_dev->dev;
 601         struct ibmvtpm_crq_queue *crq_q;
 602         struct tpm_chip *chip;
 603         int rc = -ENOMEM, rc1;
 604
 605         chip = tpm_register_hardware(dev, &tpm_ibmvtpm);
 606         if (!chip) {
 607                 dev_err(dev, "tpm_register_hardware failed\n");
 608                 return -ENODEV;
 609         }
 610
 611         ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
 612         if (!ibmvtpm) {
 613                 dev_err(dev, "kzalloc for ibmvtpm failed\n");
 614                 goto cleanup;
 615         }
 616
 617         crq_q = &ibmvtpm->crq_queue;
 618         crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
 619         if (!crq_q->crq_addr) {
 620                 dev_err(dev, "Unable to allocate memory for crq_addr\n");
 621                 goto cleanup;
 622         }
 623
 624         crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
 625         ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
 626                                                  CRQ_RES_BUF_SIZE,
 627                                                  DMA_BIDIRECTIONAL);
 628
 629         if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
 630                 dev_err(dev, "dma mapping failed\n");
 631                 goto cleanup;
 632         }
 633
 634         rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
 635                                 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
 636         if (rc == H_RESOURCE)
 637                 rc = ibmvtpm_reset_crq(ibmvtpm);
 638
 639         if (rc) {
 640                 dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
 641                 goto reg_crq_cleanup;
 642         }
 643
 644         rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
 645                          tpm_ibmvtpm_driver_name, ibmvtpm);
 646         if (rc) {
 647                 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
 648                 goto init_irq_cleanup;
 649         }
 650
 651         rc = vio_enable_interrupts(vio_dev);
 652         if (rc) {
 653                 dev_err(dev, "Error %d enabling interrupts\n", rc);
 654                 goto init_irq_cleanup;
 655         }
 656
 657         init_waitqueue_head(&ibmvtpm->wq);
 658
 659         crq_q->index = 0;
 660
 661         ibmvtpm->dev = dev;
 662         ibmvtpm->vdev = vio_dev;
 663         TPM_VPRIV(chip) = (void *)ibmvtpm;
 664
 665         spin_lock_init(&ibmvtpm->rtce_lock);
 666
 667         rc = ibmvtpm_crq_send_init(ibmvtpm);
 668         if (rc)
 669                 goto init_irq_cleanup;
 670
 671         rc = ibmvtpm_crq_get_version(ibmvtpm);
 672         if (rc)
 673                 goto init_irq_cleanup;
 674
 675         rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
 676         if (rc)
 677                 goto init_irq_cleanup;
 678
 679         return rc;
 680 init_irq_cleanup:
 681         do {
 682                 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
 683         } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
 684 reg_crq_cleanup:
 685         dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
 686                          DMA_BIDIRECTIONAL);
 687 cleanup:
 688         if (ibmvtpm) {
 689                 if (crq_q->crq_addr)
 690                         free_page((unsigned long)crq_q->crq_addr);
 691                 kfree(ibmvtpm);
 692         }
 693
 694         tpm_remove_hardware(dev);
 695
 696         return rc;
 697 }
 698
 699 static struct vio_driver ibmvtpm_driver = {
 700         .id_table        = tpm_ibmvtpm_device_table,
 701         .probe           = tpm_ibmvtpm_probe,
 702         .remove          = tpm_ibmvtpm_remove,
 703         .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
 704         .name            = tpm_ibmvtpm_driver_name,
 705         .pm              = &tpm_ibmvtpm_pm_ops,
 706 };
 707
 708 /**
 709  * ibmvtpm_module_init - Initialize ibm vtpm module
 710  *
 711  * Return value:
 712  *      0 -Success
 713  *      Non-zero - Failure
 714  */
 715 static int __init ibmvtpm_module_init(void)
 716 {
 717         return vio_register_driver(&ibmvtpm_driver);
 718 }
 719
 720 /**
 721  * ibmvtpm_module_exit - Teardown ibm vtpm module
 722  *
 723  * Return value:
 724  *      Nothing
 725  */
 726 static void __exit ibmvtpm_module_exit(void)
 727 {
 728         vio_unregister_driver(&ibmvtpm_driver);
 729 }
 730
 731 module_init(ibmvtpm_module_init);
 732 module_exit(ibmvtpm_module_exit);
 733
 734 MODULE_AUTHOR("adlai@us.ibm.com");
 735 MODULE_DESCRIPTION("IBM vTPM Driver");
 736 MODULE_VERSION("1.0");
 737 MODULE_LICENSE("GPL");