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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2005, 2006 IBM Corporation
4 * Copyright (C) 2014, 2015 Intel Corporation
5 *
6 * Authors:
7 * Leendert van Doorn <leendert@watson.ibm.com>
8 * Kylene Hall <kjhall@us.ibm.com>
9 *
10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
11 *
12 * Device driver for TCG/TCPA TPM (trusted platform module).
13 * Specifications at www.trustedcomputinggroup.org
14 *
15 * This device driver implements the TPM interface as defined in
16 * the TCG TPM Interface Spec version 1.2, revision 1.0.
17 */
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/pnp.h>
22#include <linux/slab.h>
23#include <linux/interrupt.h>
24#include <linux/wait.h>
25#include <linux/acpi.h>
26#include <linux/freezer.h>
27#include "tpm.h"
28#include "tpm_tis_core.h"
29
30static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value);
31
32static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
33 bool check_cancel, bool *canceled)
34{
35 u8 status = chip->ops->status(chip);
36
37 *canceled = false;
38 if ((status & mask) == mask)
39 return true;
40 if (check_cancel && chip->ops->req_canceled(chip, status)) {
41 *canceled = true;
42 return true;
43 }
44 return false;
45}
46
47static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask,
48 unsigned long timeout, wait_queue_head_t *queue,
49 bool check_cancel)
50{
51 unsigned long stop;
52 long rc;
53 u8 status;
54 bool canceled = false;
55
56 /* check current status */
57 status = chip->ops->status(chip);
58 if ((status & mask) == mask)
59 return 0;
60
61 stop = jiffies + timeout;
62
63 if (chip->flags & TPM_CHIP_FLAG_IRQ) {
64again:
65 timeout = stop - jiffies;
66 if ((long)timeout <= 0)
67 return -ETIME;
68 rc = wait_event_interruptible_timeout(*queue,
69 wait_for_tpm_stat_cond(chip, mask, check_cancel,
70 &canceled),
71 timeout);
72 if (rc > 0) {
73 if (canceled)
74 return -ECANCELED;
75 return 0;
76 }
77 if (rc == -ERESTARTSYS && freezing(current)) {
78 clear_thread_flag(TIF_SIGPENDING);
79 goto again;
80 }
81 } else {
82 do {
83 usleep_range(TPM_TIMEOUT_USECS_MIN,
84 TPM_TIMEOUT_USECS_MAX);
85 status = chip->ops->status(chip);
86 if ((status & mask) == mask)
87 return 0;
88 } while (time_before(jiffies, stop));
89 }
90 return -ETIME;
91}
92
93/* Before we attempt to access the TPM we must see that the valid bit is set.
94 * The specification says that this bit is 0 at reset and remains 0 until the
95 * 'TPM has gone through its self test and initialization and has established
96 * correct values in the other bits.'
97 */
98static int wait_startup(struct tpm_chip *chip, int l)
99{
100 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
101 unsigned long stop = jiffies + chip->timeout_a;
102
103 do {
104 int rc;
105 u8 access;
106
107 rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
108 if (rc < 0)
109 return rc;
110
111 if (access & TPM_ACCESS_VALID)
112 return 0;
113 tpm_msleep(TPM_TIMEOUT);
114 } while (time_before(jiffies, stop));
115 return -1;
116}
117
118static bool check_locality(struct tpm_chip *chip, int l)
119{
120 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
121 int rc;
122 u8 access;
123
124 rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
125 if (rc < 0)
126 return false;
127
128 if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
129 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
130 priv->locality = l;
131 return true;
132 }
133
134 return false;
135}
136
137static bool locality_inactive(struct tpm_chip *chip, int l)
138{
139 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
140 int rc;
141 u8 access;
142
143 rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
144 if (rc < 0)
145 return false;
146
147 if ((access & (TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY))
148 == TPM_ACCESS_VALID)
149 return true;
150
151 return false;
152}
153
154static int release_locality(struct tpm_chip *chip, int l)
155{
156 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
157 unsigned long stop, timeout;
158 long rc;
159
160 tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
161
162 stop = jiffies + chip->timeout_a;
163
164 if (chip->flags & TPM_CHIP_FLAG_IRQ) {
165again:
166 timeout = stop - jiffies;
167 if ((long)timeout <= 0)
168 return -1;
169
170 rc = wait_event_interruptible_timeout(priv->int_queue,
171 (locality_inactive(chip, l)),
172 timeout);
173
174 if (rc > 0)
175 return 0;
176
177 if (rc == -ERESTARTSYS && freezing(current)) {
178 clear_thread_flag(TIF_SIGPENDING);
179 goto again;
180 }
181 } else {
182 do {
183 if (locality_inactive(chip, l))
184 return 0;
185 tpm_msleep(TPM_TIMEOUT);
186 } while (time_before(jiffies, stop));
187 }
188 return -1;
189}
190
191static int request_locality(struct tpm_chip *chip, int l)
192{
193 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
194 unsigned long stop, timeout;
195 long rc;
196
197 if (check_locality(chip, l))
198 return l;
199
200 rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
201 if (rc < 0)
202 return rc;
203
204 stop = jiffies + chip->timeout_a;
205
206 if (chip->flags & TPM_CHIP_FLAG_IRQ) {
207again:
208 timeout = stop - jiffies;
209 if ((long)timeout <= 0)
210 return -1;
211 rc = wait_event_interruptible_timeout(priv->int_queue,
212 (check_locality
213 (chip, l)),
214 timeout);
215 if (rc > 0)
216 return l;
217 if (rc == -ERESTARTSYS && freezing(current)) {
218 clear_thread_flag(TIF_SIGPENDING);
219 goto again;
220 }
221 } else {
222 /* wait for burstcount */
223 do {
224 if (check_locality(chip, l))
225 return l;
226 tpm_msleep(TPM_TIMEOUT);
227 } while (time_before(jiffies, stop));
228 }
229 return -1;
230}
231
232static u8 tpm_tis_status(struct tpm_chip *chip)
233{
234 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
235 int rc;
236 u8 status;
237
238 rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status);
239 if (rc < 0)
240 return 0;
241
242 return status;
243}
244
245static void tpm_tis_ready(struct tpm_chip *chip)
246{
247 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
248
249 /* this causes the current command to be aborted */
250 tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY);
251}
252
253static int get_burstcount(struct tpm_chip *chip)
254{
255 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
256 unsigned long stop;
257 int burstcnt, rc;
258 u32 value;
259
260 /* wait for burstcount */
261 if (chip->flags & TPM_CHIP_FLAG_TPM2)
262 stop = jiffies + chip->timeout_a;
263 else
264 stop = jiffies + chip->timeout_d;
265 do {
266 rc = tpm_tis_read32(priv, TPM_STS(priv->locality), &value);
267 if (rc < 0)
268 return rc;
269
270 burstcnt = (value >> 8) & 0xFFFF;
271 if (burstcnt)
272 return burstcnt;
273 usleep_range(TPM_TIMEOUT_USECS_MIN, TPM_TIMEOUT_USECS_MAX);
274 } while (time_before(jiffies, stop));
275 return -EBUSY;
276}
277
278static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
279{
280 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
281 int size = 0, burstcnt, rc;
282
283 while (size < count) {
284 rc = wait_for_tpm_stat(chip,
285 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
286 chip->timeout_c,
287 &priv->read_queue, true);
288 if (rc < 0)
289 return rc;
290 burstcnt = get_burstcount(chip);
291 if (burstcnt < 0) {
292 dev_err(&chip->dev, "Unable to read burstcount\n");
293 return burstcnt;
294 }
295 burstcnt = min_t(int, burstcnt, count - size);
296
297 rc = tpm_tis_read_bytes(priv, TPM_DATA_FIFO(priv->locality),
298 burstcnt, buf + size);
299 if (rc < 0)
300 return rc;
301
302 size += burstcnt;
303 }
304 return size;
305}
306
307static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
308{
309 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
310 int size = 0;
311 int status;
312 u32 expected;
313
314 if (count < TPM_HEADER_SIZE) {
315 size = -EIO;
316 goto out;
317 }
318
319 size = recv_data(chip, buf, TPM_HEADER_SIZE);
320 /* read first 10 bytes, including tag, paramsize, and result */
321 if (size < TPM_HEADER_SIZE) {
322 dev_err(&chip->dev, "Unable to read header\n");
323 goto out;
324 }
325
326 expected = be32_to_cpu(*(__be32 *) (buf + 2));
327 if (expected > count || expected < TPM_HEADER_SIZE) {
328 size = -EIO;
329 goto out;
330 }
331
332 size += recv_data(chip, &buf[TPM_HEADER_SIZE],
333 expected - TPM_HEADER_SIZE);
334 if (size < expected) {
335 dev_err(&chip->dev, "Unable to read remainder of result\n");
336 size = -ETIME;
337 goto out;
338 }
339
340 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
341 &priv->int_queue, false) < 0) {
342 size = -ETIME;
343 goto out;
344 }
345 status = tpm_tis_status(chip);
346 if (status & TPM_STS_DATA_AVAIL) { /* retry? */
347 dev_err(&chip->dev, "Error left over data\n");
348 size = -EIO;
349 goto out;
350 }
351
352out:
353 tpm_tis_ready(chip);
354 return size;
355}
356
357/*
358 * If interrupts are used (signaled by an irq set in the vendor structure)
359 * tpm.c can skip polling for the data to be available as the interrupt is
360 * waited for here
361 */
362static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
363{
364 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
365 int rc, status, burstcnt;
366 size_t count = 0;
367 bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND;
368
369 status = tpm_tis_status(chip);
370 if ((status & TPM_STS_COMMAND_READY) == 0) {
371 tpm_tis_ready(chip);
372 if (wait_for_tpm_stat
373 (chip, TPM_STS_COMMAND_READY, chip->timeout_b,
374 &priv->int_queue, false) < 0) {
375 rc = -ETIME;
376 goto out_err;
377 }
378 }
379
380 while (count < len - 1) {
381 burstcnt = get_burstcount(chip);
382 if (burstcnt < 0) {
383 dev_err(&chip->dev, "Unable to read burstcount\n");
384 rc = burstcnt;
385 goto out_err;
386 }
387 burstcnt = min_t(int, burstcnt, len - count - 1);
388 rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality),
389 burstcnt, buf + count);
390 if (rc < 0)
391 goto out_err;
392
393 count += burstcnt;
394
395 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
396 &priv->int_queue, false) < 0) {
397 rc = -ETIME;
398 goto out_err;
399 }
400 status = tpm_tis_status(chip);
401 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
402 rc = -EIO;
403 goto out_err;
404 }
405 }
406
407 /* write last byte */
408 rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]);
409 if (rc < 0)
410 goto out_err;
411
412 if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
413 &priv->int_queue, false) < 0) {
414 rc = -ETIME;
415 goto out_err;
416 }
417 status = tpm_tis_status(chip);
418 if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) {
419 rc = -EIO;
420 goto out_err;
421 }
422
423 return 0;
424
425out_err:
426 tpm_tis_ready(chip);
427 return rc;
428}
429
430static void disable_interrupts(struct tpm_chip *chip)
431{
432 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
433 u32 intmask;
434 int rc;
435
436 if (priv->irq == 0)
437 return;
438
439 rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
440 if (rc < 0)
441 intmask = 0;
442
443 intmask &= ~TPM_GLOBAL_INT_ENABLE;
444 rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
445
446 devm_free_irq(chip->dev.parent, priv->irq, chip);
447 priv->irq = 0;
448 chip->flags &= ~TPM_CHIP_FLAG_IRQ;
449}
450
451/*
452 * If interrupts are used (signaled by an irq set in the vendor structure)
453 * tpm.c can skip polling for the data to be available as the interrupt is
454 * waited for here
455 */
456static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
457{
458 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
459 int rc;
460 u32 ordinal;
461 unsigned long dur;
462
463 rc = tpm_tis_send_data(chip, buf, len);
464 if (rc < 0)
465 return rc;
466
467 /* go and do it */
468 rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
469 if (rc < 0)
470 goto out_err;
471
472 if (chip->flags & TPM_CHIP_FLAG_IRQ) {
473 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
474
475 dur = tpm_calc_ordinal_duration(chip, ordinal);
476 if (wait_for_tpm_stat
477 (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
478 &priv->read_queue, false) < 0) {
479 rc = -ETIME;
480 goto out_err;
481 }
482 }
483 return 0;
484out_err:
485 tpm_tis_ready(chip);
486 return rc;
487}
488
489static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
490{
491 int rc, irq;
492 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
493
494 if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested)
495 return tpm_tis_send_main(chip, buf, len);
496
497 /* Verify receipt of the expected IRQ */
498 irq = priv->irq;
499 priv->irq = 0;
500 chip->flags &= ~TPM_CHIP_FLAG_IRQ;
501 rc = tpm_tis_send_main(chip, buf, len);
502 priv->irq = irq;
503 chip->flags |= TPM_CHIP_FLAG_IRQ;
504 if (!priv->irq_tested)
505 tpm_msleep(1);
506 if (!priv->irq_tested)
507 disable_interrupts(chip);
508 priv->irq_tested = true;
509 return rc;
510}
511
512struct tis_vendor_durations_override {
513 u32 did_vid;
514 struct tpm1_version version;
515 unsigned long durations[3];
516};
517
518static const struct tis_vendor_durations_override vendor_dur_overrides[] = {
519 /* STMicroelectronics 0x104a */
520 { 0x0000104a,
521 { 1, 2, 8, 28 },
522 { (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } },
523};
524
525static void tpm_tis_update_durations(struct tpm_chip *chip,
526 unsigned long *duration_cap)
527{
528 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
529 struct tpm1_version *version;
530 u32 did_vid;
531 int i, rc;
532 cap_t cap;
533
534 chip->duration_adjusted = false;
535
536 if (chip->ops->clk_enable != NULL)
537 chip->ops->clk_enable(chip, true);
538
539 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
540 if (rc < 0) {
541 dev_warn(&chip->dev, "%s: failed to read did_vid. %d\n",
542 __func__, rc);
543 goto out;
544 }
545
546 /* Try to get a TPM version 1.2 or 1.1 TPM_CAP_VERSION_INFO */
547 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
548 "attempting to determine the 1.2 version",
549 sizeof(cap.version2));
550 if (!rc) {
551 version = &cap.version2.version;
552 } else {
553 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
554 "attempting to determine the 1.1 version",
555 sizeof(cap.version1));
556
557 if (rc)
558 goto out;
559
560 version = &cap.version1;
561 }
562
563 for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) {
564 if (vendor_dur_overrides[i].did_vid != did_vid)
565 continue;
566
567 if ((version->major ==
568 vendor_dur_overrides[i].version.major) &&
569 (version->minor ==
570 vendor_dur_overrides[i].version.minor) &&
571 (version->rev_major ==
572 vendor_dur_overrides[i].version.rev_major) &&
573 (version->rev_minor ==
574 vendor_dur_overrides[i].version.rev_minor)) {
575
576 memcpy(duration_cap,
577 vendor_dur_overrides[i].durations,
578 sizeof(vendor_dur_overrides[i].durations));
579
580 chip->duration_adjusted = true;
581 goto out;
582 }
583 }
584
585out:
586 if (chip->ops->clk_enable != NULL)
587 chip->ops->clk_enable(chip, false);
588}
589
590struct tis_vendor_timeout_override {
591 u32 did_vid;
592 unsigned long timeout_us[4];
593};
594
595static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
596 /* Atmel 3204 */
597 { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
598 (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
599};
600
601static void tpm_tis_update_timeouts(struct tpm_chip *chip,
602 unsigned long *timeout_cap)
603{
604 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
605 int i, rc;
606 u32 did_vid;
607
608 chip->timeout_adjusted = false;
609
610 if (chip->ops->clk_enable != NULL)
611 chip->ops->clk_enable(chip, true);
612
613 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
614 if (rc < 0) {
615 dev_warn(&chip->dev, "%s: failed to read did_vid: %d\n",
616 __func__, rc);
617 goto out;
618 }
619
620 for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
621 if (vendor_timeout_overrides[i].did_vid != did_vid)
622 continue;
623 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
624 sizeof(vendor_timeout_overrides[i].timeout_us));
625 chip->timeout_adjusted = true;
626 }
627
628out:
629 if (chip->ops->clk_enable != NULL)
630 chip->ops->clk_enable(chip, false);
631
632 return;
633}
634
635/*
636 * Early probing for iTPM with STS_DATA_EXPECT flaw.
637 * Try sending command without itpm flag set and if that
638 * fails, repeat with itpm flag set.
639 */
640static int probe_itpm(struct tpm_chip *chip)
641{
642 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
643 int rc = 0;
644 static const u8 cmd_getticks[] = {
645 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
646 0x00, 0x00, 0x00, 0xf1
647 };
648 size_t len = sizeof(cmd_getticks);
649 u16 vendor;
650
651 if (priv->flags & TPM_TIS_ITPM_WORKAROUND)
652 return 0;
653
654 rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor);
655 if (rc < 0)
656 return rc;
657
658 /* probe only iTPMS */
659 if (vendor != TPM_VID_INTEL)
660 return 0;
661
662 if (request_locality(chip, 0) != 0)
663 return -EBUSY;
664
665 rc = tpm_tis_send_data(chip, cmd_getticks, len);
666 if (rc == 0)
667 goto out;
668
669 tpm_tis_ready(chip);
670
671 priv->flags |= TPM_TIS_ITPM_WORKAROUND;
672
673 rc = tpm_tis_send_data(chip, cmd_getticks, len);
674 if (rc == 0)
675 dev_info(&chip->dev, "Detected an iTPM.\n");
676 else {
677 priv->flags &= ~TPM_TIS_ITPM_WORKAROUND;
678 rc = -EFAULT;
679 }
680
681out:
682 tpm_tis_ready(chip);
683 release_locality(chip, priv->locality);
684
685 return rc;
686}
687
688static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
689{
690 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
691
692 switch (priv->manufacturer_id) {
693 case TPM_VID_WINBOND:
694 return ((status == TPM_STS_VALID) ||
695 (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
696 case TPM_VID_STM:
697 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
698 default:
699 return (status == TPM_STS_COMMAND_READY);
700 }
701}
702
703static irqreturn_t tis_int_handler(int dummy, void *dev_id)
704{
705 struct tpm_chip *chip = dev_id;
706 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
707 u32 interrupt;
708 int i, rc;
709
710 rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
711 if (rc < 0)
712 return IRQ_NONE;
713
714 if (interrupt == 0)
715 return IRQ_NONE;
716
717 priv->irq_tested = true;
718 if (interrupt & TPM_INTF_DATA_AVAIL_INT)
719 wake_up_interruptible(&priv->read_queue);
720 if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
721 for (i = 0; i < 5; i++)
722 if (check_locality(chip, i))
723 break;
724 if (interrupt &
725 (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
726 TPM_INTF_CMD_READY_INT))
727 wake_up_interruptible(&priv->int_queue);
728
729 /* Clear interrupts handled with TPM_EOI */
730 rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt);
731 if (rc < 0)
732 return IRQ_NONE;
733
734 tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
735 return IRQ_HANDLED;
736}
737
738static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
739{
740 const char *desc = "attempting to generate an interrupt";
741 u32 cap2;
742 cap_t cap;
743
744 if (chip->flags & TPM_CHIP_FLAG_TPM2)
745 return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
746 else
747 return tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc,
748 0);
749}
750
751/* Register the IRQ and issue a command that will cause an interrupt. If an
752 * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
753 * everything and leave in polling mode. Returns 0 on success.
754 */
755static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
756 int flags, int irq)
757{
758 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
759 u8 original_int_vec;
760 int rc;
761 u32 int_status;
762
763 if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
764 dev_name(&chip->dev), chip) != 0) {
765 dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
766 irq);
767 return -1;
768 }
769 priv->irq = irq;
770
771 rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
772 &original_int_vec);
773 if (rc < 0)
774 return rc;
775
776 rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq);
777 if (rc < 0)
778 return rc;
779
780 rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status);
781 if (rc < 0)
782 return rc;
783
784 /* Clear all existing */
785 rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status);
786 if (rc < 0)
787 return rc;
788
789 /* Turn on */
790 rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality),
791 intmask | TPM_GLOBAL_INT_ENABLE);
792 if (rc < 0)
793 return rc;
794
795 priv->irq_tested = false;
796
797 /* Generate an interrupt by having the core call through to
798 * tpm_tis_send
799 */
800 rc = tpm_tis_gen_interrupt(chip);
801 if (rc < 0)
802 return rc;
803
804 /* tpm_tis_send will either confirm the interrupt is working or it
805 * will call disable_irq which undoes all of the above.
806 */
807 if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
808 rc = tpm_tis_write8(priv, original_int_vec,
809 TPM_INT_VECTOR(priv->locality));
810 if (rc < 0)
811 return rc;
812
813 return 1;
814 }
815
816 return 0;
817}
818
819/* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
820 * do not have ACPI/etc. We typically expect the interrupt to be declared if
821 * present.
822 */
823static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
824{
825 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
826 u8 original_int_vec;
827 int i, rc;
828
829 rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
830 &original_int_vec);
831 if (rc < 0)
832 return;
833
834 if (!original_int_vec) {
835 if (IS_ENABLED(CONFIG_X86))
836 for (i = 3; i <= 15; i++)
837 if (!tpm_tis_probe_irq_single(chip, intmask, 0,
838 i))
839 return;
840 } else if (!tpm_tis_probe_irq_single(chip, intmask, 0,
841 original_int_vec))
842 return;
843}
844
845void tpm_tis_remove(struct tpm_chip *chip)
846{
847 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
848 u32 reg = TPM_INT_ENABLE(priv->locality);
849 u32 interrupt;
850 int rc;
851
852 tpm_tis_clkrun_enable(chip, true);
853
854 rc = tpm_tis_read32(priv, reg, &interrupt);
855 if (rc < 0)
856 interrupt = 0;
857
858 tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
859
860 tpm_tis_clkrun_enable(chip, false);
861
862 if (priv->ilb_base_addr)
863 iounmap(priv->ilb_base_addr);
864}
865EXPORT_SYMBOL_GPL(tpm_tis_remove);
866
867/**
868 * tpm_tis_clkrun_enable() - Keep clkrun protocol disabled for entire duration
869 * of a single TPM command
870 * @chip: TPM chip to use
871 * @value: 1 - Disable CLKRUN protocol, so that clocks are free running
872 * 0 - Enable CLKRUN protocol
873 * Call this function directly in tpm_tis_remove() in error or driver removal
874 * path, since the chip->ops is set to NULL in tpm_chip_unregister().
875 */
876static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value)
877{
878 struct tpm_tis_data *data = dev_get_drvdata(&chip->dev);
879 u32 clkrun_val;
880
881 if (!IS_ENABLED(CONFIG_X86) || !is_bsw() ||
882 !data->ilb_base_addr)
883 return;
884
885 if (value) {
886 data->clkrun_enabled++;
887 if (data->clkrun_enabled > 1)
888 return;
889 clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
890
891 /* Disable LPC CLKRUN# */
892 clkrun_val &= ~LPC_CLKRUN_EN;
893 iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
894
895 /*
896 * Write any random value on port 0x80 which is on LPC, to make
897 * sure LPC clock is running before sending any TPM command.
898 */
899 outb(0xCC, 0x80);
900 } else {
901 data->clkrun_enabled--;
902 if (data->clkrun_enabled)
903 return;
904
905 clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
906
907 /* Enable LPC CLKRUN# */
908 clkrun_val |= LPC_CLKRUN_EN;
909 iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
910
911 /*
912 * Write any random value on port 0x80 which is on LPC, to make
913 * sure LPC clock is running before sending any TPM command.
914 */
915 outb(0xCC, 0x80);
916 }
917}
918
919static const struct tpm_class_ops tpm_tis = {
920 .flags = TPM_OPS_AUTO_STARTUP,
921 .status = tpm_tis_status,
922 .recv = tpm_tis_recv,
923 .send = tpm_tis_send,
924 .cancel = tpm_tis_ready,
925 .update_timeouts = tpm_tis_update_timeouts,
926 .update_durations = tpm_tis_update_durations,
927 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
928 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
929 .req_canceled = tpm_tis_req_canceled,
930 .request_locality = request_locality,
931 .relinquish_locality = release_locality,
932 .clk_enable = tpm_tis_clkrun_enable,
933};
934
935int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
936 const struct tpm_tis_phy_ops *phy_ops,
937 acpi_handle acpi_dev_handle)
938{
939 u32 vendor;
940 u32 intfcaps;
941 u32 intmask;
942 u32 clkrun_val;
943 u8 rid;
944 int rc, probe;
945 struct tpm_chip *chip;
946
947 chip = tpmm_chip_alloc(dev, &tpm_tis);
948 if (IS_ERR(chip))
949 return PTR_ERR(chip);
950
951#ifdef CONFIG_ACPI
952 chip->acpi_dev_handle = acpi_dev_handle;
953#endif
954
955 chip->hwrng.quality = priv->rng_quality;
956
957 /* Maximum timeouts */
958 chip->timeout_a = msecs_to_jiffies(TIS_TIMEOUT_A_MAX);
959 chip->timeout_b = msecs_to_jiffies(TIS_TIMEOUT_B_MAX);
960 chip->timeout_c = msecs_to_jiffies(TIS_TIMEOUT_C_MAX);
961 chip->timeout_d = msecs_to_jiffies(TIS_TIMEOUT_D_MAX);
962 priv->phy_ops = phy_ops;
963 dev_set_drvdata(&chip->dev, priv);
964
965 if (is_bsw()) {
966 priv->ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR,
967 ILB_REMAP_SIZE);
968 if (!priv->ilb_base_addr)
969 return -ENOMEM;
970
971 clkrun_val = ioread32(priv->ilb_base_addr + LPC_CNTRL_OFFSET);
972 /* Check if CLKRUN# is already not enabled in the LPC bus */
973 if (!(clkrun_val & LPC_CLKRUN_EN)) {
974 iounmap(priv->ilb_base_addr);
975 priv->ilb_base_addr = NULL;
976 }
977 }
978
979 if (chip->ops->clk_enable != NULL)
980 chip->ops->clk_enable(chip, true);
981
982 if (wait_startup(chip, 0) != 0) {
983 rc = -ENODEV;
984 goto out_err;
985 }
986
987 /* Take control of the TPM's interrupt hardware and shut it off */
988 rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
989 if (rc < 0)
990 goto out_err;
991
992 intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
993 TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
994 intmask &= ~TPM_GLOBAL_INT_ENABLE;
995 tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
996
997 rc = tpm_chip_start(chip);
998 if (rc)
999 goto out_err;
1000 rc = tpm2_probe(chip);
1001 tpm_chip_stop(chip);
1002 if (rc)
1003 goto out_err;
1004
1005 rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
1006 if (rc < 0)
1007 goto out_err;
1008
1009 priv->manufacturer_id = vendor;
1010
1011 rc = tpm_tis_read8(priv, TPM_RID(0), &rid);
1012 if (rc < 0)
1013 goto out_err;
1014
1015 dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
1016 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
1017 vendor >> 16, rid);
1018
1019 probe = probe_itpm(chip);
1020 if (probe < 0) {
1021 rc = -ENODEV;
1022 goto out_err;
1023 }
1024
1025 /* Figure out the capabilities */
1026 rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps);
1027 if (rc < 0)
1028 goto out_err;
1029
1030 dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
1031 intfcaps);
1032 if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
1033 dev_dbg(dev, "\tBurst Count Static\n");
1034 if (intfcaps & TPM_INTF_CMD_READY_INT)
1035 dev_dbg(dev, "\tCommand Ready Int Support\n");
1036 if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
1037 dev_dbg(dev, "\tInterrupt Edge Falling\n");
1038 if (intfcaps & TPM_INTF_INT_EDGE_RISING)
1039 dev_dbg(dev, "\tInterrupt Edge Rising\n");
1040 if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
1041 dev_dbg(dev, "\tInterrupt Level Low\n");
1042 if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
1043 dev_dbg(dev, "\tInterrupt Level High\n");
1044 if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
1045 dev_dbg(dev, "\tLocality Change Int Support\n");
1046 if (intfcaps & TPM_INTF_STS_VALID_INT)
1047 dev_dbg(dev, "\tSts Valid Int Support\n");
1048 if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
1049 dev_dbg(dev, "\tData Avail Int Support\n");
1050
1051 /* INTERRUPT Setup */
1052 init_waitqueue_head(&priv->read_queue);
1053 init_waitqueue_head(&priv->int_queue);
1054 if (irq != -1) {
1055 /* Before doing irq testing issue a command to the TPM in polling mode
1056 * to make sure it works. May as well use that command to set the
1057 * proper timeouts for the driver.
1058 */
1059 if (tpm_get_timeouts(chip)) {
1060 dev_err(dev, "Could not get TPM timeouts and durations\n");
1061 rc = -ENODEV;
1062 goto out_err;
1063 }
1064
1065 if (irq) {
1066 tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
1067 irq);
1068 if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
1069 dev_err(&chip->dev, FW_BUG
1070 "TPM interrupt not working, polling instead\n");
1071
1072 disable_interrupts(chip);
1073 }
1074 } else {
1075 tpm_tis_probe_irq(chip, intmask);
1076 }
1077 }
1078
1079 rc = tpm_chip_register(chip);
1080 if (rc)
1081 goto out_err;
1082
1083 if (chip->ops->clk_enable != NULL)
1084 chip->ops->clk_enable(chip, false);
1085
1086 return 0;
1087out_err:
1088 if (chip->ops->clk_enable != NULL)
1089 chip->ops->clk_enable(chip, false);
1090
1091 tpm_tis_remove(chip);
1092
1093 return rc;
1094}
1095EXPORT_SYMBOL_GPL(tpm_tis_core_init);
1096
1097#ifdef CONFIG_PM_SLEEP
1098static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
1099{
1100 struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
1101 u32 intmask;
1102 int rc;
1103
1104 if (chip->ops->clk_enable != NULL)
1105 chip->ops->clk_enable(chip, true);
1106
1107 /* reenable interrupts that device may have lost or
1108 * BIOS/firmware may have disabled
1109 */
1110 rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
1111 if (rc < 0)
1112 goto out;
1113
1114 rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
1115 if (rc < 0)
1116 goto out;
1117
1118 intmask |= TPM_INTF_CMD_READY_INT
1119 | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
1120 | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
1121
1122 tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
1123
1124out:
1125 if (chip->ops->clk_enable != NULL)
1126 chip->ops->clk_enable(chip, false);
1127
1128 return;
1129}
1130
1131int tpm_tis_resume(struct device *dev)
1132{
1133 struct tpm_chip *chip = dev_get_drvdata(dev);
1134 int ret;
1135
1136 if (chip->flags & TPM_CHIP_FLAG_IRQ)
1137 tpm_tis_reenable_interrupts(chip);
1138
1139 ret = tpm_pm_resume(dev);
1140 if (ret)
1141 return ret;
1142
1143 /* TPM 1.2 requires self-test on resume. This function actually returns
1144 * an error code but for unknown reason it isn't handled.
1145 */
1146 if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
1147 tpm1_do_selftest(chip);
1148
1149 return 0;
1150}
1151EXPORT_SYMBOL_GPL(tpm_tis_resume);
1152#endif
1153
1154MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1155MODULE_DESCRIPTION("TPM Driver");
1156MODULE_VERSION("2.0");
1157MODULE_LICENSE("GPL");