Loading...
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
33static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
34
35static struct vio_device_id tpm_ibmvtpm_device_table[] = {
36 { "IBM,vtpm", "IBM,vtpm"},
37 { "", "" }
38};
39MODULE_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 */
51static 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 */
63static 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 */
80static 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 */
123static 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
180static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
181{
182 return;
183}
184
185static 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 */
198static 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 */
225static 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 */
251static 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 */
271static 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 */
290static 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 */
328static 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 */
349static 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 */
376static 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 */
401static 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
431static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
432{
433 return (status == 0);
434}
435
436static 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
446static 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 */
458static 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 */
480static 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 **/
553static 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 */
580static 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);
663init_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));
667reg_crq_cleanup:
668 dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
669 DMA_BIDIRECTIONAL);
670cleanup:
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
680static 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 */
696static 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 */
707static void __exit ibmvtpm_module_exit(void)
708{
709 vio_unregister_driver(&ibmvtpm_driver);
710}
711
712module_init(ibmvtpm_module_init);
713module_exit(ibmvtpm_module_exit);
714
715MODULE_AUTHOR("adlai@us.ibm.com");
716MODULE_DESCRIPTION("IBM vTPM Driver");
717MODULE_VERSION("1.0");
718MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 IBM Corporation
4 *
5 * Author: Ashley Lai <ashleydlai@gmail.com>
6 *
7 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
8 *
9 * Device driver for TCG/TCPA TPM (trusted platform module).
10 * Specifications at www.trustedcomputinggroup.org
11 */
12
13#include <linux/dma-mapping.h>
14#include <linux/dmapool.h>
15#include <linux/slab.h>
16#include <asm/vio.h>
17#include <asm/irq.h>
18#include <linux/types.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/interrupt.h>
22#include <linux/wait.h>
23#include <asm/prom.h>
24
25#include "tpm.h"
26#include "tpm_ibmvtpm.h"
27
28static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
29
30static const struct vio_device_id tpm_ibmvtpm_device_table[] = {
31 { "IBM,vtpm", "IBM,vtpm"},
32 { "", "" }
33};
34MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
35
36/**
37 * ibmvtpm_send_crq_word() - Send a CRQ request
38 * @vdev: vio device struct
39 * @w1: pre-constructed first word of tpm crq (second word is reserved)
40 *
41 * Return:
42 * 0 - Success
43 * Non-zero - Failure
44 */
45static int ibmvtpm_send_crq_word(struct vio_dev *vdev, u64 w1)
46{
47 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, 0);
48}
49
50/**
51 * ibmvtpm_send_crq() - Send a CRQ request
52 *
53 * @vdev: vio device struct
54 * @valid: Valid field
55 * @msg: Type field
56 * @len: Length field
57 * @data: Data field
58 *
59 * The ibmvtpm crq is defined as follows:
60 *
61 * Byte | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
62 * -----------------------------------------------------------------------
63 * Word0 | Valid | Type | Length | Data
64 * -----------------------------------------------------------------------
65 * Word1 | Reserved
66 * -----------------------------------------------------------------------
67 *
68 * Which matches the following structure (on bigendian host):
69 *
70 * struct ibmvtpm_crq {
71 * u8 valid;
72 * u8 msg;
73 * __be16 len;
74 * __be32 data;
75 * __be64 reserved;
76 * } __attribute__((packed, aligned(8)));
77 *
78 * However, the value is passed in a register so just compute the numeric value
79 * to load into the register avoiding byteswap altogether. Endian only affects
80 * memory loads and stores - registers are internally represented the same.
81 *
82 * Return:
83 * 0 (H_SUCCESS) - Success
84 * Non-zero - Failure
85 */
86static int ibmvtpm_send_crq(struct vio_dev *vdev,
87 u8 valid, u8 msg, u16 len, u32 data)
88{
89 u64 w1 = ((u64)valid << 56) | ((u64)msg << 48) | ((u64)len << 32) |
90 (u64)data;
91 return ibmvtpm_send_crq_word(vdev, w1);
92}
93
94/**
95 * tpm_ibmvtpm_recv - Receive data after send
96 *
97 * @chip: tpm chip struct
98 * @buf: buffer to read
99 * @count: size of buffer
100 *
101 * Return:
102 * Number of bytes read
103 */
104static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
105{
106 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
107 u16 len;
108 int sig;
109
110 if (!ibmvtpm->rtce_buf) {
111 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
112 return 0;
113 }
114
115 sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
116 if (sig)
117 return -EINTR;
118
119 len = ibmvtpm->res_len;
120
121 if (count < len) {
122 dev_err(ibmvtpm->dev,
123 "Invalid size in recv: count=%zd, crq_size=%d\n",
124 count, len);
125 return -EIO;
126 }
127
128 spin_lock(&ibmvtpm->rtce_lock);
129 memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
130 memset(ibmvtpm->rtce_buf, 0, len);
131 ibmvtpm->res_len = 0;
132 spin_unlock(&ibmvtpm->rtce_lock);
133 return len;
134}
135
136/**
137 * tpm_ibmvtpm_send() - Send a TPM command
138 * @chip: tpm chip struct
139 * @buf: buffer contains data to send
140 * @count: size of buffer
141 *
142 * Return:
143 * 0 on success,
144 * -errno on error
145 */
146static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
147{
148 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
149 int rc, sig;
150
151 if (!ibmvtpm->rtce_buf) {
152 dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
153 return 0;
154 }
155
156 if (count > ibmvtpm->rtce_size) {
157 dev_err(ibmvtpm->dev,
158 "Invalid size in send: count=%zd, rtce_size=%d\n",
159 count, ibmvtpm->rtce_size);
160 return -EIO;
161 }
162
163 if (ibmvtpm->tpm_processing_cmd) {
164 dev_info(ibmvtpm->dev,
165 "Need to wait for TPM to finish\n");
166 /* wait for previous command to finish */
167 sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);
168 if (sig)
169 return -EINTR;
170 }
171
172 spin_lock(&ibmvtpm->rtce_lock);
173 ibmvtpm->res_len = 0;
174 memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
175
176 /*
177 * set the processing flag before the Hcall, since we may get the
178 * result (interrupt) before even being able to check rc.
179 */
180 ibmvtpm->tpm_processing_cmd = true;
181
182 rc = ibmvtpm_send_crq(ibmvtpm->vdev,
183 IBMVTPM_VALID_CMD, VTPM_TPM_COMMAND,
184 count, ibmvtpm->rtce_dma_handle);
185 if (rc != H_SUCCESS) {
186 dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
187 rc = 0;
188 ibmvtpm->tpm_processing_cmd = false;
189 } else
190 rc = 0;
191
192 spin_unlock(&ibmvtpm->rtce_lock);
193 return rc;
194}
195
196static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
197{
198 return;
199}
200
201static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
202{
203 return 0;
204}
205
206/**
207 * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
208 *
209 * @ibmvtpm: vtpm device struct
210 *
211 * Return:
212 * 0 on success.
213 * Non-zero on failure.
214 */
215static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
216{
217 int rc;
218
219 rc = ibmvtpm_send_crq(ibmvtpm->vdev,
220 IBMVTPM_VALID_CMD, VTPM_GET_RTCE_BUFFER_SIZE, 0, 0);
221 if (rc != H_SUCCESS)
222 dev_err(ibmvtpm->dev,
223 "ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
224
225 return rc;
226}
227
228/**
229 * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
230 * - Note that this is vtpm version and not tpm version
231 *
232 * @ibmvtpm: vtpm device struct
233 *
234 * Return:
235 * 0 on success.
236 * Non-zero on failure.
237 */
238static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
239{
240 int rc;
241
242 rc = ibmvtpm_send_crq(ibmvtpm->vdev,
243 IBMVTPM_VALID_CMD, VTPM_GET_VERSION, 0, 0);
244 if (rc != H_SUCCESS)
245 dev_err(ibmvtpm->dev,
246 "ibmvtpm_crq_get_version failed rc=%d\n", rc);
247
248 return rc;
249}
250
251/**
252 * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
253 * @ibmvtpm: vtpm device struct
254 *
255 * Return:
256 * 0 on success.
257 * Non-zero on failure.
258 */
259static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
260{
261 int rc;
262
263 rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_COMP_CMD);
264 if (rc != H_SUCCESS)
265 dev_err(ibmvtpm->dev,
266 "ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
267
268 return rc;
269}
270
271/**
272 * ibmvtpm_crq_send_init - Send a CRQ initialize message
273 * @ibmvtpm: vtpm device struct
274 *
275 * Return:
276 * 0 on success.
277 * Non-zero on failure.
278 */
279static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
280{
281 int rc;
282
283 rc = ibmvtpm_send_crq_word(ibmvtpm->vdev, INIT_CRQ_CMD);
284 if (rc != H_SUCCESS)
285 dev_err(ibmvtpm->dev,
286 "ibmvtpm_crq_send_init failed rc=%d\n", rc);
287
288 return rc;
289}
290
291/**
292 * tpm_ibmvtpm_remove - ibm vtpm remove entry point
293 * @vdev: vio device struct
294 *
295 * Return: Always 0.
296 */
297static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
298{
299 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev);
300 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
301 int rc = 0;
302
303 tpm_chip_unregister(chip);
304
305 free_irq(vdev->irq, ibmvtpm);
306
307 do {
308 if (rc)
309 msleep(100);
310 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
311 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
312
313 dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
314 CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
315 free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
316
317 if (ibmvtpm->rtce_buf) {
318 dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
319 ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
320 kfree(ibmvtpm->rtce_buf);
321 }
322
323 kfree(ibmvtpm);
324 /* For tpm_ibmvtpm_get_desired_dma */
325 dev_set_drvdata(&vdev->dev, NULL);
326
327 return 0;
328}
329
330/**
331 * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
332 * @vdev: vio device struct
333 *
334 * Return:
335 * Number of bytes the driver needs to DMA map.
336 */
337static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
338{
339 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev);
340 struct ibmvtpm_dev *ibmvtpm;
341
342 /*
343 * ibmvtpm initializes at probe time, so the data we are
344 * asking for may not be set yet. Estimate that 4K required
345 * for TCE-mapped buffer in addition to CRQ.
346 */
347 if (chip)
348 ibmvtpm = dev_get_drvdata(&chip->dev);
349 else
350 return CRQ_RES_BUF_SIZE + PAGE_SIZE;
351
352 return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
353}
354
355/**
356 * tpm_ibmvtpm_suspend - Suspend
357 * @dev: device struct
358 *
359 * Return: Always 0.
360 */
361static int tpm_ibmvtpm_suspend(struct device *dev)
362{
363 struct tpm_chip *chip = dev_get_drvdata(dev);
364 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
365 int rc = 0;
366
367 rc = ibmvtpm_send_crq(ibmvtpm->vdev,
368 IBMVTPM_VALID_CMD, VTPM_PREPARE_TO_SUSPEND, 0, 0);
369 if (rc != H_SUCCESS)
370 dev_err(ibmvtpm->dev,
371 "tpm_ibmvtpm_suspend failed rc=%d\n", rc);
372
373 return rc;
374}
375
376/**
377 * ibmvtpm_reset_crq - Reset CRQ
378 *
379 * @ibmvtpm: ibm vtpm struct
380 *
381 * Return:
382 * 0 on success.
383 * Non-zero on failure.
384 */
385static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
386{
387 int rc = 0;
388
389 do {
390 if (rc)
391 msleep(100);
392 rc = plpar_hcall_norets(H_FREE_CRQ,
393 ibmvtpm->vdev->unit_address);
394 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
395
396 memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
397 ibmvtpm->crq_queue.index = 0;
398
399 return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
400 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
401}
402
403/**
404 * tpm_ibmvtpm_resume - Resume from suspend
405 *
406 * @dev: device struct
407 *
408 * Return: Always 0.
409 */
410static int tpm_ibmvtpm_resume(struct device *dev)
411{
412 struct tpm_chip *chip = dev_get_drvdata(dev);
413 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
414 int rc = 0;
415
416 do {
417 if (rc)
418 msleep(100);
419 rc = plpar_hcall_norets(H_ENABLE_CRQ,
420 ibmvtpm->vdev->unit_address);
421 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
422
423 if (rc) {
424 dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
425 return rc;
426 }
427
428 rc = vio_enable_interrupts(ibmvtpm->vdev);
429 if (rc) {
430 dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
431 return rc;
432 }
433
434 rc = ibmvtpm_crq_send_init(ibmvtpm);
435 if (rc)
436 dev_err(dev, "Error send_init rc=%d\n", rc);
437
438 return rc;
439}
440
441static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
442{
443 return (status == 0);
444}
445
446static const struct tpm_class_ops tpm_ibmvtpm = {
447 .recv = tpm_ibmvtpm_recv,
448 .send = tpm_ibmvtpm_send,
449 .cancel = tpm_ibmvtpm_cancel,
450 .status = tpm_ibmvtpm_status,
451 .req_complete_mask = 0,
452 .req_complete_val = 0,
453 .req_canceled = tpm_ibmvtpm_req_canceled,
454};
455
456static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
457 .suspend = tpm_ibmvtpm_suspend,
458 .resume = tpm_ibmvtpm_resume,
459};
460
461/**
462 * ibmvtpm_crq_get_next - Get next responded crq
463 *
464 * @ibmvtpm: vtpm device struct
465 *
466 * Return: vtpm crq pointer or NULL.
467 */
468static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
469{
470 struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
471 struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
472
473 if (crq->valid & VTPM_MSG_RES) {
474 if (++crq_q->index == crq_q->num_entry)
475 crq_q->index = 0;
476 smp_rmb();
477 } else
478 crq = NULL;
479 return crq;
480}
481
482/**
483 * ibmvtpm_crq_process - Process responded crq
484 *
485 * @crq: crq to be processed
486 * @ibmvtpm: vtpm device struct
487 *
488 */
489static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
490 struct ibmvtpm_dev *ibmvtpm)
491{
492 int rc = 0;
493
494 switch (crq->valid) {
495 case VALID_INIT_CRQ:
496 switch (crq->msg) {
497 case INIT_CRQ_RES:
498 dev_info(ibmvtpm->dev, "CRQ initialized\n");
499 rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
500 if (rc)
501 dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
502 return;
503 case INIT_CRQ_COMP_RES:
504 dev_info(ibmvtpm->dev,
505 "CRQ initialization completed\n");
506 return;
507 default:
508 dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
509 return;
510 }
511 case IBMVTPM_VALID_CMD:
512 switch (crq->msg) {
513 case VTPM_GET_RTCE_BUFFER_SIZE_RES:
514 if (be16_to_cpu(crq->len) <= 0) {
515 dev_err(ibmvtpm->dev, "Invalid rtce size\n");
516 return;
517 }
518 ibmvtpm->rtce_size = be16_to_cpu(crq->len);
519 ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
520 GFP_ATOMIC);
521 if (!ibmvtpm->rtce_buf) {
522 dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
523 return;
524 }
525
526 ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
527 ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
528 DMA_BIDIRECTIONAL);
529
530 if (dma_mapping_error(ibmvtpm->dev,
531 ibmvtpm->rtce_dma_handle)) {
532 kfree(ibmvtpm->rtce_buf);
533 ibmvtpm->rtce_buf = NULL;
534 dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
535 }
536
537 return;
538 case VTPM_GET_VERSION_RES:
539 ibmvtpm->vtpm_version = be32_to_cpu(crq->data);
540 return;
541 case VTPM_TPM_COMMAND_RES:
542 /* len of the data in rtce buffer */
543 ibmvtpm->res_len = be16_to_cpu(crq->len);
544 ibmvtpm->tpm_processing_cmd = false;
545 wake_up_interruptible(&ibmvtpm->wq);
546 return;
547 default:
548 return;
549 }
550 }
551 return;
552}
553
554/**
555 * ibmvtpm_interrupt - Interrupt handler
556 *
557 * @irq: irq number to handle
558 * @vtpm_instance: vtpm that received interrupt
559 *
560 * Returns:
561 * IRQ_HANDLED
562 **/
563static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
564{
565 struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
566 struct ibmvtpm_crq *crq;
567
568 /* while loop is needed for initial setup (get version and
569 * get rtce_size). There should be only one tpm request at any
570 * given time.
571 */
572 while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
573 ibmvtpm_crq_process(crq, ibmvtpm);
574 crq->valid = 0;
575 smp_wmb();
576 }
577
578 return IRQ_HANDLED;
579}
580
581/**
582 * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
583 *
584 * @vio_dev: vio device struct
585 * @id: vio device id struct
586 *
587 * Return:
588 * 0 on success.
589 * Non-zero on failure.
590 */
591static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
592 const struct vio_device_id *id)
593{
594 struct ibmvtpm_dev *ibmvtpm;
595 struct device *dev = &vio_dev->dev;
596 struct ibmvtpm_crq_queue *crq_q;
597 struct tpm_chip *chip;
598 int rc = -ENOMEM, rc1;
599
600 chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
601 if (IS_ERR(chip))
602 return PTR_ERR(chip);
603
604 ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
605 if (!ibmvtpm) {
606 dev_err(dev, "kzalloc for ibmvtpm failed\n");
607 goto cleanup;
608 }
609
610 ibmvtpm->dev = dev;
611 ibmvtpm->vdev = vio_dev;
612
613 crq_q = &ibmvtpm->crq_queue;
614 crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
615 if (!crq_q->crq_addr) {
616 dev_err(dev, "Unable to allocate memory for crq_addr\n");
617 goto cleanup;
618 }
619
620 crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
621 ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
622 CRQ_RES_BUF_SIZE,
623 DMA_BIDIRECTIONAL);
624
625 if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
626 dev_err(dev, "dma mapping failed\n");
627 goto cleanup;
628 }
629
630 rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
631 ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
632 if (rc == H_RESOURCE)
633 rc = ibmvtpm_reset_crq(ibmvtpm);
634
635 if (rc) {
636 dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
637 goto reg_crq_cleanup;
638 }
639
640 rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
641 tpm_ibmvtpm_driver_name, ibmvtpm);
642 if (rc) {
643 dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
644 goto init_irq_cleanup;
645 }
646
647 rc = vio_enable_interrupts(vio_dev);
648 if (rc) {
649 dev_err(dev, "Error %d enabling interrupts\n", rc);
650 goto init_irq_cleanup;
651 }
652
653 init_waitqueue_head(&ibmvtpm->wq);
654
655 crq_q->index = 0;
656
657 dev_set_drvdata(&chip->dev, ibmvtpm);
658
659 spin_lock_init(&ibmvtpm->rtce_lock);
660
661 rc = ibmvtpm_crq_send_init(ibmvtpm);
662 if (rc)
663 goto init_irq_cleanup;
664
665 rc = ibmvtpm_crq_get_version(ibmvtpm);
666 if (rc)
667 goto init_irq_cleanup;
668
669 rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
670 if (rc)
671 goto init_irq_cleanup;
672
673 return tpm_chip_register(chip);
674init_irq_cleanup:
675 do {
676 rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
677 } while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
678reg_crq_cleanup:
679 dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
680 DMA_BIDIRECTIONAL);
681cleanup:
682 if (ibmvtpm) {
683 if (crq_q->crq_addr)
684 free_page((unsigned long)crq_q->crq_addr);
685 kfree(ibmvtpm);
686 }
687
688 return rc;
689}
690
691static struct vio_driver ibmvtpm_driver = {
692 .id_table = tpm_ibmvtpm_device_table,
693 .probe = tpm_ibmvtpm_probe,
694 .remove = tpm_ibmvtpm_remove,
695 .get_desired_dma = tpm_ibmvtpm_get_desired_dma,
696 .name = tpm_ibmvtpm_driver_name,
697 .pm = &tpm_ibmvtpm_pm_ops,
698};
699
700/**
701 * ibmvtpm_module_init - Initialize ibm vtpm module.
702 *
703 *
704 * Return:
705 * 0 on success.
706 * Non-zero on failure.
707 */
708static int __init ibmvtpm_module_init(void)
709{
710 return vio_register_driver(&ibmvtpm_driver);
711}
712
713/**
714 * ibmvtpm_module_exit - Tear down ibm vtpm module.
715 */
716static void __exit ibmvtpm_module_exit(void)
717{
718 vio_unregister_driver(&ibmvtpm_driver);
719}
720
721module_init(ibmvtpm_module_init);
722module_exit(ibmvtpm_module_exit);
723
724MODULE_AUTHOR("adlai@us.ibm.com");
725MODULE_DESCRIPTION("IBM vTPM Driver");
726MODULE_VERSION("1.0");
727MODULE_LICENSE("GPL");