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 const 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_word() - Send a CRQ request 43 * @vdev: vio device struct 44 * @w1: pre-constructed first word of tpm crq (second word is reserved) 45 * 46 * Return: 47 * 0 - Success 48 * Non-zero - Failure 49 */ 50 static int ibmvtpm_send_crq_word(struct vio_dev *vdev, u64 w1) 51 { 52 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, 0); 53 } 54 55 /** 56 * ibmvtpm_send_crq() - Send a CRQ request 57 * 58 * @vdev: vio device struct 59 * @valid: Valid field 60 * @msg: Type field 61 * @len: Length field 62 * @data: Data field 63 * 64 * The ibmvtpm crq is defined as follows: 65 * 66 * Byte | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 67 * ----------------------------------------------------------------------- 68 * Word0 | Valid | Type | Length | Data 69 * ----------------------------------------------------------------------- 70 * Word1 | Reserved 71 * ----------------------------------------------------------------------- 72 * 73 * Which matches the following structure (on bigendian host): 74 * 75 * struct ibmvtpm_crq { 76 * u8 valid; 77 * u8 msg; 78 * __be16 len; 79 * __be32 data; 80 * __be64 reserved; 81 * } __attribute__((packed, aligned(8))); 82 * 83 * However, the value is passed in a register so just compute the numeric value 84 * to load into the register avoiding byteswap altogether. Endian only affects 85 * memory loads and stores - registers are internally represented the same. 86 * 87 * Return: 88 * 0 (H_SUCCESS) - Success 89 * Non-zero - Failure 90 */ 91 static int ibmvtpm_send_crq(struct vio_dev *vdev, 92 u8 valid, u8 msg, u16 len, u32 data) 93 { 94 u64 w1 = ((u64)valid << 56) | ((u64)msg << 48) | ((u64)len << 32) | 95 (u64)data; 96 return ibmvtpm_send_crq_word(vdev, w1); 97 } 98 99 /** 100 * tpm_ibmvtpm_recv - Receive data after send 101 * 102 * @chip: tpm chip struct 103 * @buf: buffer to read 104 * @count: size of buffer 105 * 106 * Return: 107 * Number of bytes read 108 */ 109 static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) 110 { 111 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 112 u16 len; 113 int sig; 114 115 if (!ibmvtpm->rtce_buf) { 116 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); 117 return 0; 118 } 119 120 sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd); 121 if (sig) 122 return -EINTR; 123 124 len = ibmvtpm->res_len; 125 126 if (count < len) { 127 dev_err(ibmvtpm->dev, 128 "Invalid size in recv: count=%zd, crq_size=%d\n", 129 count, len); 130 return -EIO; 131 } 132 133 spin_lock(&ibmvtpm->rtce_lock); 134 memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len); 135 memset(ibmvtpm->rtce_buf, 0, len); 136 ibmvtpm->res_len = 0; 137 spin_unlock(&ibmvtpm->rtce_lock); 138 return len; 139 } 140 141 /** 142 * tpm_ibmvtpm_send() - Send a TPM command 143 * @chip: tpm chip struct 144 * @buf: buffer contains data to send 145 * @count: size of buffer 146 * 147 * Return: 148 * 0 on success, 149 * -errno on error 150 */ 151 static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) 152 { 153 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 154 int rc, sig; 155 156 if (!ibmvtpm->rtce_buf) { 157 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n"); 158 return 0; 159 } 160 161 if (count > ibmvtpm->rtce_size) { 162 dev_err(ibmvtpm->dev, 163 "Invalid size in send: count=%zd, rtce_size=%d\n", 164 count, ibmvtpm->rtce_size); 165 return -EIO; 166 } 167 168 if (ibmvtpm->tpm_processing_cmd) { 169 dev_info(ibmvtpm->dev, 170 "Need to wait for TPM to finish\n"); 171 /* wait for previous command to finish */ 172 sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd); 173 if (sig) 174 return -EINTR; 175 } 176 177 spin_lock(&ibmvtpm->rtce_lock); 178 ibmvtpm->res_len = 0; 179 memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count); 180 181 /* 182 * set the processing flag before the Hcall, since we may get the 183 * result (interrupt) before even being able to check rc. 184 */ 185 ibmvtpm->tpm_processing_cmd = true; 186 187 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 188 IBMVTPM_VALID_CMD, VTPM_TPM_COMMAND, 189 count, ibmvtpm->rtce_dma_handle); 190 if (rc != H_SUCCESS) { 191 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc); 192 rc = 0; 193 ibmvtpm->tpm_processing_cmd = false; 194 } else 195 rc = 0; 196 197 spin_unlock(&ibmvtpm->rtce_lock); 198 return rc; 199 } 200 201 static void tpm_ibmvtpm_cancel(struct tpm_chip *chip) 202 { 203 return; 204 } 205 206 static u8 tpm_ibmvtpm_status(struct tpm_chip *chip) 207 { 208 return 0; 209 } 210 211 /** 212 * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size 213 * 214 * @ibmvtpm: vtpm device struct 215 * 216 * Return: 217 * 0 on success. 218 * Non-zero on failure. 219 */ 220 static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm) 221 { 222 int rc; 223 224 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 225 IBMVTPM_VALID_CMD, VTPM_GET_RTCE_BUFFER_SIZE, 0, 0); 226 if (rc != H_SUCCESS) 227 dev_err(ibmvtpm->dev, 228 "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc); 229 230 return rc; 231 } 232 233 /** 234 * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version 235 * - Note that this is vtpm version and not tpm version 236 * 237 * @ibmvtpm: vtpm device struct 238 * 239 * Return: 240 * 0 on success. 241 * Non-zero on failure. 242 */ 243 static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm) 244 { 245 int rc; 246 247 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 248 IBMVTPM_VALID_CMD, VTPM_GET_VERSION, 0, 0); 249 if (rc != H_SUCCESS) 250 dev_err(ibmvtpm->dev, 251 "ibmvtpm_crq_get_version failed rc=%d\n", rc); 252 253 return rc; 254 } 255 256 /** 257 * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message 258 * @ibmvtpm: vtpm device struct 259 * 260 * Return: 261 * 0 on success. 262 * Non-zero on failure. 263 */ 264 static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm) 265 { 266 int rc; 267 268 rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_COMP_CMD); 269 if (rc != H_SUCCESS) 270 dev_err(ibmvtpm->dev, 271 "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc); 272 273 return rc; 274 } 275 276 /** 277 * ibmvtpm_crq_send_init - Send a CRQ initialize message 278 * @ibmvtpm: vtpm device struct 279 * 280 * Return: 281 * 0 on success. 282 * Non-zero on failure. 283 */ 284 static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm) 285 { 286 int rc; 287 288 rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_CMD); 289 if (rc != H_SUCCESS) 290 dev_err(ibmvtpm->dev, 291 "ibmvtpm_crq_send_init failed rc=%d\n", rc); 292 293 return rc; 294 } 295 296 /** 297 * tpm_ibmvtpm_remove - ibm vtpm remove entry point 298 * @vdev: vio device struct 299 * 300 * Return: Always 0. 301 */ 302 static int tpm_ibmvtpm_remove(struct vio_dev *vdev) 303 { 304 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); 305 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 306 int rc = 0; 307 308 tpm_chip_unregister(chip); 309 310 free_irq(vdev->irq, ibmvtpm); 311 312 do { 313 if (rc) 314 msleep(100); 315 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 316 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 317 318 dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle, 319 CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL); 320 free_page((unsigned long)ibmvtpm->crq_queue.crq_addr); 321 322 if (ibmvtpm->rtce_buf) { 323 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle, 324 ibmvtpm->rtce_size, DMA_BIDIRECTIONAL); 325 kfree(ibmvtpm->rtce_buf); 326 } 327 328 kfree(ibmvtpm); 329 /* For tpm_ibmvtpm_get_desired_dma */ 330 dev_set_drvdata(&vdev->dev, NULL); 331 332 return 0; 333 } 334 335 /** 336 * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver 337 * @vdev: vio device struct 338 * 339 * Return: 340 * Number of bytes the driver needs to DMA map. 341 */ 342 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev) 343 { 344 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); 345 struct ibmvtpm_dev *ibmvtpm; 346 347 /* 348 * ibmvtpm initializes at probe time, so the data we are 349 * asking for may not be set yet. Estimate that 4K required 350 * for TCE-mapped buffer in addition to CRQ. 351 */ 352 if (chip) 353 ibmvtpm = dev_get_drvdata(&chip->dev); 354 else 355 return CRQ_RES_BUF_SIZE + PAGE_SIZE; 356 357 return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size; 358 } 359 360 /** 361 * tpm_ibmvtpm_suspend - Suspend 362 * @dev: device struct 363 * 364 * Return: Always 0. 365 */ 366 static int tpm_ibmvtpm_suspend(struct device *dev) 367 { 368 struct tpm_chip *chip = dev_get_drvdata(dev); 369 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 370 int rc = 0; 371 372 rc = ibmvtpm_send_crq(ibmvtpm->vdev, 373 IBMVTPM_VALID_CMD, VTPM_PREPARE_TO_SUSPEND, 0, 0); 374 if (rc != H_SUCCESS) 375 dev_err(ibmvtpm->dev, 376 "tpm_ibmvtpm_suspend failed rc=%d\n", rc); 377 378 return rc; 379 } 380 381 /** 382 * ibmvtpm_reset_crq - Reset CRQ 383 * 384 * @ibmvtpm: ibm vtpm struct 385 * 386 * Return: 387 * 0 on success. 388 * Non-zero on failure. 389 */ 390 static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm) 391 { 392 int rc = 0; 393 394 do { 395 if (rc) 396 msleep(100); 397 rc = plpar_hcall_norets(H_FREE_CRQ, 398 ibmvtpm->vdev->unit_address); 399 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 400 401 memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE); 402 ibmvtpm->crq_queue.index = 0; 403 404 return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address, 405 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); 406 } 407 408 /** 409 * tpm_ibmvtpm_resume - Resume from suspend 410 * 411 * @dev: device struct 412 * 413 * Return: Always 0. 414 */ 415 static int tpm_ibmvtpm_resume(struct device *dev) 416 { 417 struct tpm_chip *chip = dev_get_drvdata(dev); 418 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 419 int rc = 0; 420 421 do { 422 if (rc) 423 msleep(100); 424 rc = plpar_hcall_norets(H_ENABLE_CRQ, 425 ibmvtpm->vdev->unit_address); 426 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 427 428 if (rc) { 429 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc); 430 return rc; 431 } 432 433 rc = vio_enable_interrupts(ibmvtpm->vdev); 434 if (rc) { 435 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc); 436 return rc; 437 } 438 439 rc = ibmvtpm_crq_send_init(ibmvtpm); 440 if (rc) 441 dev_err(dev, "Error send_init rc=%d\n", rc); 442 443 return rc; 444 } 445 446 static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status) 447 { 448 return (status == 0); 449 } 450 451 static const struct tpm_class_ops tpm_ibmvtpm = { 452 .recv = tpm_ibmvtpm_recv, 453 .send = tpm_ibmvtpm_send, 454 .cancel = tpm_ibmvtpm_cancel, 455 .status = tpm_ibmvtpm_status, 456 .req_complete_mask = 0, 457 .req_complete_val = 0, 458 .req_canceled = tpm_ibmvtpm_req_canceled, 459 }; 460 461 static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = { 462 .suspend = tpm_ibmvtpm_suspend, 463 .resume = tpm_ibmvtpm_resume, 464 }; 465 466 /** 467 * ibmvtpm_crq_get_next - Get next responded crq 468 * 469 * @ibmvtpm: vtpm device struct 470 * 471 * Return: vtpm crq pointer or NULL. 472 */ 473 static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm) 474 { 475 struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue; 476 struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index]; 477 478 if (crq->valid & VTPM_MSG_RES) { 479 if (++crq_q->index == crq_q->num_entry) 480 crq_q->index = 0; 481 smp_rmb(); 482 } else 483 crq = NULL; 484 return crq; 485 } 486 487 /** 488 * ibmvtpm_crq_process - Process responded crq 489 * 490 * @crq: crq to be processed 491 * @ibmvtpm: vtpm device struct 492 * 493 */ 494 static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq, 495 struct ibmvtpm_dev *ibmvtpm) 496 { 497 int rc = 0; 498 499 switch (crq->valid) { 500 case VALID_INIT_CRQ: 501 switch (crq->msg) { 502 case INIT_CRQ_RES: 503 dev_info(ibmvtpm->dev, "CRQ initialized\n"); 504 rc = ibmvtpm_crq_send_init_complete(ibmvtpm); 505 if (rc) 506 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc); 507 return; 508 case INIT_CRQ_COMP_RES: 509 dev_info(ibmvtpm->dev, 510 "CRQ initialization completed\n"); 511 return; 512 default: 513 dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg); 514 return; 515 } 516 case IBMVTPM_VALID_CMD: 517 switch (crq->msg) { 518 case VTPM_GET_RTCE_BUFFER_SIZE_RES: 519 if (be16_to_cpu(crq->len) <= 0) { 520 dev_err(ibmvtpm->dev, "Invalid rtce size\n"); 521 return; 522 } 523 ibmvtpm->rtce_size = be16_to_cpu(crq->len); 524 ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size, 525 GFP_ATOMIC); 526 if (!ibmvtpm->rtce_buf) { 527 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n"); 528 return; 529 } 530 531 ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev, 532 ibmvtpm->rtce_buf, ibmvtpm->rtce_size, 533 DMA_BIDIRECTIONAL); 534 535 if (dma_mapping_error(ibmvtpm->dev, 536 ibmvtpm->rtce_dma_handle)) { 537 kfree(ibmvtpm->rtce_buf); 538 ibmvtpm->rtce_buf = NULL; 539 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n"); 540 } 541 542 return; 543 case VTPM_GET_VERSION_RES: 544 ibmvtpm->vtpm_version = be32_to_cpu(crq->data); 545 return; 546 case VTPM_TPM_COMMAND_RES: 547 /* len of the data in rtce buffer */ 548 ibmvtpm->res_len = be16_to_cpu(crq->len); 549 ibmvtpm->tpm_processing_cmd = false; 550 wake_up_interruptible(&ibmvtpm->wq); 551 return; 552 default: 553 return; 554 } 555 } 556 return; 557 } 558 559 /** 560 * ibmvtpm_interrupt - Interrupt handler 561 * 562 * @irq: irq number to handle 563 * @vtpm_instance: vtpm that received interrupt 564 * 565 * Returns: 566 * IRQ_HANDLED 567 **/ 568 static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance) 569 { 570 struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance; 571 struct ibmvtpm_crq *crq; 572 573 /* while loop is needed for initial setup (get version and 574 * get rtce_size). There should be only one tpm request at any 575 * given time. 576 */ 577 while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) { 578 ibmvtpm_crq_process(crq, ibmvtpm); 579 crq->valid = 0; 580 smp_wmb(); 581 } 582 583 return IRQ_HANDLED; 584 } 585 586 /** 587 * tpm_ibmvtpm_probe - ibm vtpm initialize entry point 588 * 589 * @vio_dev: vio device struct 590 * @id: vio device id struct 591 * 592 * Return: 593 * 0 on success. 594 * Non-zero on 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 = tpmm_chip_alloc(dev, &tpm_ibmvtpm); 606 if (IS_ERR(chip)) 607 return PTR_ERR(chip); 608 609 ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL); 610 if (!ibmvtpm) { 611 dev_err(dev, "kzalloc for ibmvtpm failed\n"); 612 goto cleanup; 613 } 614 615 ibmvtpm->dev = dev; 616 ibmvtpm->vdev = vio_dev; 617 618 crq_q = &ibmvtpm->crq_queue; 619 crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL); 620 if (!crq_q->crq_addr) { 621 dev_err(dev, "Unable to allocate memory for crq_addr\n"); 622 goto cleanup; 623 } 624 625 crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr); 626 ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr, 627 CRQ_RES_BUF_SIZE, 628 DMA_BIDIRECTIONAL); 629 630 if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) { 631 dev_err(dev, "dma mapping failed\n"); 632 goto cleanup; 633 } 634 635 rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address, 636 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE); 637 if (rc == H_RESOURCE) 638 rc = ibmvtpm_reset_crq(ibmvtpm); 639 640 if (rc) { 641 dev_err(dev, "Unable to register CRQ rc=%d\n", rc); 642 goto reg_crq_cleanup; 643 } 644 645 rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0, 646 tpm_ibmvtpm_driver_name, ibmvtpm); 647 if (rc) { 648 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq); 649 goto init_irq_cleanup; 650 } 651 652 rc = vio_enable_interrupts(vio_dev); 653 if (rc) { 654 dev_err(dev, "Error %d enabling interrupts\n", rc); 655 goto init_irq_cleanup; 656 } 657 658 init_waitqueue_head(&ibmvtpm->wq); 659 660 crq_q->index = 0; 661 662 dev_set_drvdata(&chip->dev, ibmvtpm); 663 664 spin_lock_init(&ibmvtpm->rtce_lock); 665 666 rc = ibmvtpm_crq_send_init(ibmvtpm); 667 if (rc) 668 goto init_irq_cleanup; 669 670 rc = ibmvtpm_crq_get_version(ibmvtpm); 671 if (rc) 672 goto init_irq_cleanup; 673 674 rc = ibmvtpm_crq_get_rtce_size(ibmvtpm); 675 if (rc) 676 goto init_irq_cleanup; 677 678 return tpm_chip_register(chip); 679 init_irq_cleanup: 680 do { 681 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address); 682 } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1)); 683 reg_crq_cleanup: 684 dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE, 685 DMA_BIDIRECTIONAL); 686 cleanup: 687 if (ibmvtpm) { 688 if (crq_q->crq_addr) 689 free_page((unsigned long)crq_q->crq_addr); 690 kfree(ibmvtpm); 691 } 692 693 return rc; 694 } 695 696 static struct vio_driver ibmvtpm_driver = { 697 .id_table = tpm_ibmvtpm_device_table, 698 .probe = tpm_ibmvtpm_probe, 699 .remove = tpm_ibmvtpm_remove, 700 .get_desired_dma = tpm_ibmvtpm_get_desired_dma, 701 .name = tpm_ibmvtpm_driver_name, 702 .pm = &tpm_ibmvtpm_pm_ops, 703 }; 704 705 /** 706 * ibmvtpm_module_init - Initialize ibm vtpm module. 707 * 708 * 709 * Return: 710 * 0 on success. 711 * Non-zero on failure. 712 */ 713 static int __init ibmvtpm_module_init(void) 714 { 715 return vio_register_driver(&ibmvtpm_driver); 716 } 717 718 /** 719 * ibmvtpm_module_exit - Tear down ibm vtpm module. 720 */ 721 static void __exit ibmvtpm_module_exit(void) 722 { 723 vio_unregister_driver(&ibmvtpm_driver); 724 } 725 726 module_init(ibmvtpm_module_init); 727 module_exit(ibmvtpm_module_exit); 728 729 MODULE_AUTHOR("adlai@us.ibm.com"); 730 MODULE_DESCRIPTION("IBM vTPM Driver"); 731 MODULE_VERSION("1.0"); 732 MODULE_LICENSE("GPL"); 733