Merge tag 'v3.10.55' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / tpm / tpm_tis.c
1 /*
2 * Copyright (C) 2005, 2006 IBM Corporation
3 *
4 * Authors:
5 * Leendert van Doorn <leendert@watson.ibm.com>
6 * Kylene Hall <kjhall@us.ibm.com>
7 *
8 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
9 *
10 * Device driver for TCG/TCPA TPM (trusted platform module).
11 * Specifications at www.trustedcomputinggroup.org
12 *
13 * This device driver implements the TPM interface as defined in
14 * the TCG TPM Interface Spec version 1.2, revision 1.0.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation, version 2 of the
19 * License.
20 */
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/pnp.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/wait.h>
28 #include <linux/acpi.h>
29 #include <linux/freezer.h>
30 #include "tpm.h"
31
32 enum tis_access {
33 TPM_ACCESS_VALID = 0x80,
34 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
35 TPM_ACCESS_REQUEST_PENDING = 0x04,
36 TPM_ACCESS_REQUEST_USE = 0x02,
37 };
38
39 enum tis_status {
40 TPM_STS_VALID = 0x80,
41 TPM_STS_COMMAND_READY = 0x40,
42 TPM_STS_GO = 0x20,
43 TPM_STS_DATA_AVAIL = 0x10,
44 TPM_STS_DATA_EXPECT = 0x08,
45 };
46
47 enum tis_int_flags {
48 TPM_GLOBAL_INT_ENABLE = 0x80000000,
49 TPM_INTF_BURST_COUNT_STATIC = 0x100,
50 TPM_INTF_CMD_READY_INT = 0x080,
51 TPM_INTF_INT_EDGE_FALLING = 0x040,
52 TPM_INTF_INT_EDGE_RISING = 0x020,
53 TPM_INTF_INT_LEVEL_LOW = 0x010,
54 TPM_INTF_INT_LEVEL_HIGH = 0x008,
55 TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
56 TPM_INTF_STS_VALID_INT = 0x002,
57 TPM_INTF_DATA_AVAIL_INT = 0x001,
58 };
59
60 enum tis_defaults {
61 TIS_MEM_BASE = 0xFED40000,
62 TIS_MEM_LEN = 0x5000,
63 TIS_SHORT_TIMEOUT = 750, /* ms */
64 TIS_LONG_TIMEOUT = 2000, /* 2 sec */
65 };
66
67 #define TPM_ACCESS(l) (0x0000 | ((l) << 12))
68 #define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12))
69 #define TPM_INT_VECTOR(l) (0x000C | ((l) << 12))
70 #define TPM_INT_STATUS(l) (0x0010 | ((l) << 12))
71 #define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12))
72 #define TPM_STS(l) (0x0018 | ((l) << 12))
73 #define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))
74
75 #define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
76 #define TPM_RID(l) (0x0F04 | ((l) << 12))
77
78 static LIST_HEAD(tis_chips);
79 static DEFINE_MUTEX(tis_lock);
80
81 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
82 static int is_itpm(struct pnp_dev *dev)
83 {
84 struct acpi_device *acpi = pnp_acpi_device(dev);
85 struct acpi_hardware_id *id;
86
87 if (!acpi)
88 return 0;
89
90 list_for_each_entry(id, &acpi->pnp.ids, list) {
91 if (!strcmp("INTC0102", id->id))
92 return 1;
93 }
94
95 return 0;
96 }
97 #else
98 static inline int is_itpm(struct pnp_dev *dev)
99 {
100 return 0;
101 }
102 #endif
103
104 /* Before we attempt to access the TPM we must see that the valid bit is set.
105 * The specification says that this bit is 0 at reset and remains 0 until the
106 * 'TPM has gone through its self test and initialization and has established
107 * correct values in the other bits.' */
108 static int wait_startup(struct tpm_chip *chip, int l)
109 {
110 unsigned long stop = jiffies + chip->vendor.timeout_a;
111 do {
112 if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
113 TPM_ACCESS_VALID)
114 return 0;
115 msleep(TPM_TIMEOUT);
116 } while (time_before(jiffies, stop));
117 return -1;
118 }
119
120 static int check_locality(struct tpm_chip *chip, int l)
121 {
122 if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
123 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
124 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
125 return chip->vendor.locality = l;
126
127 return -1;
128 }
129
130 static void release_locality(struct tpm_chip *chip, int l, int force)
131 {
132 if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
133 (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
134 (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
135 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
136 chip->vendor.iobase + TPM_ACCESS(l));
137 }
138
139 static int request_locality(struct tpm_chip *chip, int l)
140 {
141 unsigned long stop, timeout;
142 long rc;
143
144 if (check_locality(chip, l) >= 0)
145 return l;
146
147 iowrite8(TPM_ACCESS_REQUEST_USE,
148 chip->vendor.iobase + TPM_ACCESS(l));
149
150 stop = jiffies + chip->vendor.timeout_a;
151
152 if (chip->vendor.irq) {
153 again:
154 timeout = stop - jiffies;
155 if ((long)timeout <= 0)
156 return -1;
157 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
158 (check_locality
159 (chip, l) >= 0),
160 timeout);
161 if (rc > 0)
162 return l;
163 if (rc == -ERESTARTSYS && freezing(current)) {
164 clear_thread_flag(TIF_SIGPENDING);
165 goto again;
166 }
167 } else {
168 /* wait for burstcount */
169 do {
170 if (check_locality(chip, l) >= 0)
171 return l;
172 msleep(TPM_TIMEOUT);
173 }
174 while (time_before(jiffies, stop));
175 }
176 return -1;
177 }
178
179 static u8 tpm_tis_status(struct tpm_chip *chip)
180 {
181 return ioread8(chip->vendor.iobase +
182 TPM_STS(chip->vendor.locality));
183 }
184
185 static void tpm_tis_ready(struct tpm_chip *chip)
186 {
187 /* this causes the current command to be aborted */
188 iowrite8(TPM_STS_COMMAND_READY,
189 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
190 }
191
192 static int get_burstcount(struct tpm_chip *chip)
193 {
194 unsigned long stop;
195 int burstcnt;
196
197 /* wait for burstcount */
198 /* which timeout value, spec has 2 answers (c & d) */
199 stop = jiffies + chip->vendor.timeout_d;
200 do {
201 burstcnt = ioread8(chip->vendor.iobase +
202 TPM_STS(chip->vendor.locality) + 1);
203 burstcnt += ioread8(chip->vendor.iobase +
204 TPM_STS(chip->vendor.locality) +
205 2) << 8;
206 if (burstcnt)
207 return burstcnt;
208 msleep(TPM_TIMEOUT);
209 } while (time_before(jiffies, stop));
210 return -EBUSY;
211 }
212
213 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
214 {
215 int size = 0, burstcnt;
216 while (size < count &&
217 wait_for_tpm_stat(chip,
218 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
219 chip->vendor.timeout_c,
220 &chip->vendor.read_queue, true)
221 == 0) {
222 burstcnt = get_burstcount(chip);
223 for (; burstcnt > 0 && size < count; burstcnt--)
224 buf[size++] = ioread8(chip->vendor.iobase +
225 TPM_DATA_FIFO(chip->vendor.
226 locality));
227 }
228 return size;
229 }
230
231 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
232 {
233 int size = 0;
234 int expected, status;
235
236 if (count < TPM_HEADER_SIZE) {
237 size = -EIO;
238 goto out;
239 }
240
241 /* read first 10 bytes, including tag, paramsize, and result */
242 if ((size =
243 recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
244 dev_err(chip->dev, "Unable to read header\n");
245 goto out;
246 }
247
248 expected = be32_to_cpu(*(__be32 *) (buf + 2));
249 if (expected > count) {
250 size = -EIO;
251 goto out;
252 }
253
254 if ((size +=
255 recv_data(chip, &buf[TPM_HEADER_SIZE],
256 expected - TPM_HEADER_SIZE)) < expected) {
257 dev_err(chip->dev, "Unable to read remainder of result\n");
258 size = -ETIME;
259 goto out;
260 }
261
262 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
263 &chip->vendor.int_queue, false);
264 status = tpm_tis_status(chip);
265 if (status & TPM_STS_DATA_AVAIL) { /* retry? */
266 dev_err(chip->dev, "Error left over data\n");
267 size = -EIO;
268 goto out;
269 }
270
271 out:
272 tpm_tis_ready(chip);
273 release_locality(chip, chip->vendor.locality, 0);
274 return size;
275 }
276
277 static bool itpm;
278 module_param(itpm, bool, 0444);
279 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
280
281 /*
282 * If interrupts are used (signaled by an irq set in the vendor structure)
283 * tpm.c can skip polling for the data to be available as the interrupt is
284 * waited for here
285 */
286 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
287 {
288 int rc, status, burstcnt;
289 size_t count = 0;
290
291 if (request_locality(chip, 0) < 0)
292 return -EBUSY;
293
294 status = tpm_tis_status(chip);
295 if ((status & TPM_STS_COMMAND_READY) == 0) {
296 tpm_tis_ready(chip);
297 if (wait_for_tpm_stat
298 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
299 &chip->vendor.int_queue, false) < 0) {
300 rc = -ETIME;
301 goto out_err;
302 }
303 }
304
305 while (count < len - 1) {
306 burstcnt = get_burstcount(chip);
307 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
308 iowrite8(buf[count], chip->vendor.iobase +
309 TPM_DATA_FIFO(chip->vendor.locality));
310 count++;
311 }
312
313 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
314 &chip->vendor.int_queue, false);
315 status = tpm_tis_status(chip);
316 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
317 rc = -EIO;
318 goto out_err;
319 }
320 }
321
322 /* write last byte */
323 iowrite8(buf[count],
324 chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
325 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
326 &chip->vendor.int_queue, false);
327 status = tpm_tis_status(chip);
328 if ((status & TPM_STS_DATA_EXPECT) != 0) {
329 rc = -EIO;
330 goto out_err;
331 }
332
333 return 0;
334
335 out_err:
336 tpm_tis_ready(chip);
337 release_locality(chip, chip->vendor.locality, 0);
338 return rc;
339 }
340
341 /*
342 * If interrupts are used (signaled by an irq set in the vendor structure)
343 * tpm.c can skip polling for the data to be available as the interrupt is
344 * waited for here
345 */
346 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
347 {
348 int rc;
349 u32 ordinal;
350
351 rc = tpm_tis_send_data(chip, buf, len);
352 if (rc < 0)
353 return rc;
354
355 /* go and do it */
356 iowrite8(TPM_STS_GO,
357 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
358
359 if (chip->vendor.irq) {
360 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
361 if (wait_for_tpm_stat
362 (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
363 tpm_calc_ordinal_duration(chip, ordinal),
364 &chip->vendor.read_queue, false) < 0) {
365 rc = -ETIME;
366 goto out_err;
367 }
368 }
369 return len;
370 out_err:
371 tpm_tis_ready(chip);
372 release_locality(chip, chip->vendor.locality, 0);
373 return rc;
374 }
375
376 struct tis_vendor_timeout_override {
377 u32 did_vid;
378 unsigned long timeout_us[4];
379 };
380
381 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
382 /* Atmel 3204 */
383 { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
384 (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
385 };
386
387 static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
388 unsigned long *timeout_cap)
389 {
390 int i;
391 u32 did_vid;
392
393 did_vid = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
394
395 for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
396 if (vendor_timeout_overrides[i].did_vid != did_vid)
397 continue;
398 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
399 sizeof(vendor_timeout_overrides[i].timeout_us));
400 return true;
401 }
402
403 return false;
404 }
405
406 /*
407 * Early probing for iTPM with STS_DATA_EXPECT flaw.
408 * Try sending command without itpm flag set and if that
409 * fails, repeat with itpm flag set.
410 */
411 static int probe_itpm(struct tpm_chip *chip)
412 {
413 int rc = 0;
414 u8 cmd_getticks[] = {
415 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
416 0x00, 0x00, 0x00, 0xf1
417 };
418 size_t len = sizeof(cmd_getticks);
419 bool rem_itpm = itpm;
420 u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
421
422 /* probe only iTPMS */
423 if (vendor != TPM_VID_INTEL)
424 return 0;
425
426 itpm = false;
427
428 rc = tpm_tis_send_data(chip, cmd_getticks, len);
429 if (rc == 0)
430 goto out;
431
432 tpm_tis_ready(chip);
433 release_locality(chip, chip->vendor.locality, 0);
434
435 itpm = true;
436
437 rc = tpm_tis_send_data(chip, cmd_getticks, len);
438 if (rc == 0) {
439 dev_info(chip->dev, "Detected an iTPM.\n");
440 rc = 1;
441 } else
442 rc = -EFAULT;
443
444 out:
445 itpm = rem_itpm;
446 tpm_tis_ready(chip);
447 release_locality(chip, chip->vendor.locality, 0);
448
449 return rc;
450 }
451
452 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
453 {
454 switch (chip->vendor.manufacturer_id) {
455 case TPM_VID_WINBOND:
456 return ((status == TPM_STS_VALID) ||
457 (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
458 case TPM_VID_STM:
459 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
460 default:
461 return (status == TPM_STS_COMMAND_READY);
462 }
463 }
464
465 static const struct file_operations tis_ops = {
466 .owner = THIS_MODULE,
467 .llseek = no_llseek,
468 .open = tpm_open,
469 .read = tpm_read,
470 .write = tpm_write,
471 .release = tpm_release,
472 };
473
474 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
475 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
476 static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
477 static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
478 static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
479 static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
480 NULL);
481 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
482 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
483 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
484 static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
485
486 static struct attribute *tis_attrs[] = {
487 &dev_attr_pubek.attr,
488 &dev_attr_pcrs.attr,
489 &dev_attr_enabled.attr,
490 &dev_attr_active.attr,
491 &dev_attr_owned.attr,
492 &dev_attr_temp_deactivated.attr,
493 &dev_attr_caps.attr,
494 &dev_attr_cancel.attr,
495 &dev_attr_durations.attr,
496 &dev_attr_timeouts.attr, NULL,
497 };
498
499 static struct attribute_group tis_attr_grp = {
500 .attrs = tis_attrs
501 };
502
503 static struct tpm_vendor_specific tpm_tis = {
504 .status = tpm_tis_status,
505 .recv = tpm_tis_recv,
506 .send = tpm_tis_send,
507 .cancel = tpm_tis_ready,
508 .update_timeouts = tpm_tis_update_timeouts,
509 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
510 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
511 .req_canceled = tpm_tis_req_canceled,
512 .attr_group = &tis_attr_grp,
513 .miscdev = {
514 .fops = &tis_ops,},
515 };
516
517 static irqreturn_t tis_int_probe(int irq, void *dev_id)
518 {
519 struct tpm_chip *chip = dev_id;
520 u32 interrupt;
521
522 interrupt = ioread32(chip->vendor.iobase +
523 TPM_INT_STATUS(chip->vendor.locality));
524
525 if (interrupt == 0)
526 return IRQ_NONE;
527
528 chip->vendor.probed_irq = irq;
529
530 /* Clear interrupts handled with TPM_EOI */
531 iowrite32(interrupt,
532 chip->vendor.iobase +
533 TPM_INT_STATUS(chip->vendor.locality));
534 return IRQ_HANDLED;
535 }
536
537 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
538 {
539 struct tpm_chip *chip = dev_id;
540 u32 interrupt;
541 int i;
542
543 interrupt = ioread32(chip->vendor.iobase +
544 TPM_INT_STATUS(chip->vendor.locality));
545
546 if (interrupt == 0)
547 return IRQ_NONE;
548
549 if (interrupt & TPM_INTF_DATA_AVAIL_INT)
550 wake_up_interruptible(&chip->vendor.read_queue);
551 if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
552 for (i = 0; i < 5; i++)
553 if (check_locality(chip, i) >= 0)
554 break;
555 if (interrupt &
556 (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
557 TPM_INTF_CMD_READY_INT))
558 wake_up_interruptible(&chip->vendor.int_queue);
559
560 /* Clear interrupts handled with TPM_EOI */
561 iowrite32(interrupt,
562 chip->vendor.iobase +
563 TPM_INT_STATUS(chip->vendor.locality));
564 ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
565 return IRQ_HANDLED;
566 }
567
568 static bool interrupts = true;
569 module_param(interrupts, bool, 0444);
570 MODULE_PARM_DESC(interrupts, "Enable interrupts");
571
572 static int tpm_tis_init(struct device *dev, resource_size_t start,
573 resource_size_t len, unsigned int irq)
574 {
575 u32 vendor, intfcaps, intmask;
576 int rc, i, irq_s, irq_e, probe;
577 struct tpm_chip *chip;
578
579 if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
580 return -ENODEV;
581
582 chip->vendor.iobase = ioremap(start, len);
583 if (!chip->vendor.iobase) {
584 rc = -EIO;
585 goto out_err;
586 }
587
588 /* Default timeouts */
589 chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
590 chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
591 chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
592 chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
593
594 if (wait_startup(chip, 0) != 0) {
595 rc = -ENODEV;
596 goto out_err;
597 }
598
599 if (request_locality(chip, 0) != 0) {
600 rc = -ENODEV;
601 goto out_err;
602 }
603
604 vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
605 chip->vendor.manufacturer_id = vendor;
606
607 dev_info(dev,
608 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
609 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
610
611 if (!itpm) {
612 probe = probe_itpm(chip);
613 if (probe < 0) {
614 rc = -ENODEV;
615 goto out_err;
616 }
617 itpm = !!probe;
618 }
619
620 if (itpm)
621 dev_info(dev, "Intel iTPM workaround enabled\n");
622
623
624 /* Figure out the capabilities */
625 intfcaps =
626 ioread32(chip->vendor.iobase +
627 TPM_INTF_CAPS(chip->vendor.locality));
628 dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
629 intfcaps);
630 if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
631 dev_dbg(dev, "\tBurst Count Static\n");
632 if (intfcaps & TPM_INTF_CMD_READY_INT)
633 dev_dbg(dev, "\tCommand Ready Int Support\n");
634 if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
635 dev_dbg(dev, "\tInterrupt Edge Falling\n");
636 if (intfcaps & TPM_INTF_INT_EDGE_RISING)
637 dev_dbg(dev, "\tInterrupt Edge Rising\n");
638 if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
639 dev_dbg(dev, "\tInterrupt Level Low\n");
640 if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
641 dev_dbg(dev, "\tInterrupt Level High\n");
642 if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
643 dev_dbg(dev, "\tLocality Change Int Support\n");
644 if (intfcaps & TPM_INTF_STS_VALID_INT)
645 dev_dbg(dev, "\tSts Valid Int Support\n");
646 if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
647 dev_dbg(dev, "\tData Avail Int Support\n");
648
649 /* get the timeouts before testing for irqs */
650 if (tpm_get_timeouts(chip)) {
651 dev_err(dev, "Could not get TPM timeouts and durations\n");
652 rc = -ENODEV;
653 goto out_err;
654 }
655
656 if (tpm_do_selftest(chip)) {
657 dev_err(dev, "TPM self test failed\n");
658 rc = -ENODEV;
659 goto out_err;
660 }
661
662 /* INTERRUPT Setup */
663 init_waitqueue_head(&chip->vendor.read_queue);
664 init_waitqueue_head(&chip->vendor.int_queue);
665
666 intmask =
667 ioread32(chip->vendor.iobase +
668 TPM_INT_ENABLE(chip->vendor.locality));
669
670 intmask |= TPM_INTF_CMD_READY_INT
671 | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
672 | TPM_INTF_STS_VALID_INT;
673
674 iowrite32(intmask,
675 chip->vendor.iobase +
676 TPM_INT_ENABLE(chip->vendor.locality));
677 if (interrupts)
678 chip->vendor.irq = irq;
679 if (interrupts && !chip->vendor.irq) {
680 irq_s =
681 ioread8(chip->vendor.iobase +
682 TPM_INT_VECTOR(chip->vendor.locality));
683 if (irq_s) {
684 irq_e = irq_s;
685 } else {
686 irq_s = 3;
687 irq_e = 15;
688 }
689
690 for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
691 iowrite8(i, chip->vendor.iobase +
692 TPM_INT_VECTOR(chip->vendor.locality));
693 if (request_irq
694 (i, tis_int_probe, IRQF_SHARED,
695 chip->vendor.miscdev.name, chip) != 0) {
696 dev_info(chip->dev,
697 "Unable to request irq: %d for probe\n",
698 i);
699 continue;
700 }
701
702 /* Clear all existing */
703 iowrite32(ioread32
704 (chip->vendor.iobase +
705 TPM_INT_STATUS(chip->vendor.locality)),
706 chip->vendor.iobase +
707 TPM_INT_STATUS(chip->vendor.locality));
708
709 /* Turn on */
710 iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
711 chip->vendor.iobase +
712 TPM_INT_ENABLE(chip->vendor.locality));
713
714 chip->vendor.probed_irq = 0;
715
716 /* Generate Interrupts */
717 tpm_gen_interrupt(chip);
718
719 chip->vendor.irq = chip->vendor.probed_irq;
720
721 /* free_irq will call into tis_int_probe;
722 clear all irqs we haven't seen while doing
723 tpm_gen_interrupt */
724 iowrite32(ioread32
725 (chip->vendor.iobase +
726 TPM_INT_STATUS(chip->vendor.locality)),
727 chip->vendor.iobase +
728 TPM_INT_STATUS(chip->vendor.locality));
729
730 /* Turn off */
731 iowrite32(intmask,
732 chip->vendor.iobase +
733 TPM_INT_ENABLE(chip->vendor.locality));
734 free_irq(i, chip);
735 }
736 }
737 if (chip->vendor.irq) {
738 iowrite8(chip->vendor.irq,
739 chip->vendor.iobase +
740 TPM_INT_VECTOR(chip->vendor.locality));
741 if (request_irq
742 (chip->vendor.irq, tis_int_handler, IRQF_SHARED,
743 chip->vendor.miscdev.name, chip) != 0) {
744 dev_info(chip->dev,
745 "Unable to request irq: %d for use\n",
746 chip->vendor.irq);
747 chip->vendor.irq = 0;
748 } else {
749 /* Clear all existing */
750 iowrite32(ioread32
751 (chip->vendor.iobase +
752 TPM_INT_STATUS(chip->vendor.locality)),
753 chip->vendor.iobase +
754 TPM_INT_STATUS(chip->vendor.locality));
755
756 /* Turn on */
757 iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
758 chip->vendor.iobase +
759 TPM_INT_ENABLE(chip->vendor.locality));
760 }
761 }
762
763 INIT_LIST_HEAD(&chip->vendor.list);
764 mutex_lock(&tis_lock);
765 list_add(&chip->vendor.list, &tis_chips);
766 mutex_unlock(&tis_lock);
767
768
769 return 0;
770 out_err:
771 if (chip->vendor.iobase)
772 iounmap(chip->vendor.iobase);
773 tpm_remove_hardware(chip->dev);
774 return rc;
775 }
776
777 #if defined(CONFIG_PNP) || defined(CONFIG_PM_SLEEP)
778 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
779 {
780 u32 intmask;
781
782 /* reenable interrupts that device may have lost or
783 BIOS/firmware may have disabled */
784 iowrite8(chip->vendor.irq, chip->vendor.iobase +
785 TPM_INT_VECTOR(chip->vendor.locality));
786
787 intmask =
788 ioread32(chip->vendor.iobase +
789 TPM_INT_ENABLE(chip->vendor.locality));
790
791 intmask |= TPM_INTF_CMD_READY_INT
792 | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
793 | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
794
795 iowrite32(intmask,
796 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
797 }
798 #endif
799
800 #ifdef CONFIG_PNP
801 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
802 const struct pnp_device_id *pnp_id)
803 {
804 resource_size_t start, len;
805 unsigned int irq = 0;
806
807 start = pnp_mem_start(pnp_dev, 0);
808 len = pnp_mem_len(pnp_dev, 0);
809
810 if (pnp_irq_valid(pnp_dev, 0))
811 irq = pnp_irq(pnp_dev, 0);
812 else
813 interrupts = false;
814
815 if (is_itpm(pnp_dev))
816 itpm = true;
817
818 return tpm_tis_init(&pnp_dev->dev, start, len, irq);
819 }
820
821 static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
822 {
823 return tpm_pm_suspend(&dev->dev);
824 }
825
826 static int tpm_tis_pnp_resume(struct pnp_dev *dev)
827 {
828 struct tpm_chip *chip = pnp_get_drvdata(dev);
829 int ret;
830
831 if (chip->vendor.irq)
832 tpm_tis_reenable_interrupts(chip);
833
834 ret = tpm_pm_resume(&dev->dev);
835 if (!ret)
836 tpm_do_selftest(chip);
837
838 return ret;
839 }
840
841 static struct pnp_device_id tpm_pnp_tbl[] = {
842 {"PNP0C31", 0}, /* TPM */
843 {"ATM1200", 0}, /* Atmel */
844 {"IFX0102", 0}, /* Infineon */
845 {"BCM0101", 0}, /* Broadcom */
846 {"BCM0102", 0}, /* Broadcom */
847 {"NSC1200", 0}, /* National */
848 {"ICO0102", 0}, /* Intel */
849 /* Add new here */
850 {"", 0}, /* User Specified */
851 {"", 0} /* Terminator */
852 };
853 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
854
855 static void tpm_tis_pnp_remove(struct pnp_dev *dev)
856 {
857 struct tpm_chip *chip = pnp_get_drvdata(dev);
858
859 tpm_dev_vendor_release(chip);
860
861 kfree(chip);
862 }
863
864
865 static struct pnp_driver tis_pnp_driver = {
866 .name = "tpm_tis",
867 .id_table = tpm_pnp_tbl,
868 .probe = tpm_tis_pnp_init,
869 .suspend = tpm_tis_pnp_suspend,
870 .resume = tpm_tis_pnp_resume,
871 .remove = tpm_tis_pnp_remove,
872 };
873
874 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
875 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
876 sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
877 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
878 #endif
879
880 #ifdef CONFIG_PM_SLEEP
881 static int tpm_tis_resume(struct device *dev)
882 {
883 struct tpm_chip *chip = dev_get_drvdata(dev);
884
885 if (chip->vendor.irq)
886 tpm_tis_reenable_interrupts(chip);
887
888 return tpm_pm_resume(dev);
889 }
890 #endif
891
892 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
893
894 static struct platform_driver tis_drv = {
895 .driver = {
896 .name = "tpm_tis",
897 .owner = THIS_MODULE,
898 .pm = &tpm_tis_pm,
899 },
900 };
901
902 static struct platform_device *pdev;
903
904 static bool force;
905 module_param(force, bool, 0444);
906 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
907 static int __init init_tis(void)
908 {
909 int rc;
910 #ifdef CONFIG_PNP
911 if (!force)
912 return pnp_register_driver(&tis_pnp_driver);
913 #endif
914
915 rc = platform_driver_register(&tis_drv);
916 if (rc < 0)
917 return rc;
918 if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
919 return PTR_ERR(pdev);
920 if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
921 platform_device_unregister(pdev);
922 platform_driver_unregister(&tis_drv);
923 }
924 return rc;
925 }
926
927 static void __exit cleanup_tis(void)
928 {
929 struct tpm_vendor_specific *i, *j;
930 struct tpm_chip *chip;
931 mutex_lock(&tis_lock);
932 list_for_each_entry_safe(i, j, &tis_chips, list) {
933 chip = to_tpm_chip(i);
934 tpm_remove_hardware(chip->dev);
935 iowrite32(~TPM_GLOBAL_INT_ENABLE &
936 ioread32(chip->vendor.iobase +
937 TPM_INT_ENABLE(chip->vendor.
938 locality)),
939 chip->vendor.iobase +
940 TPM_INT_ENABLE(chip->vendor.locality));
941 release_locality(chip, chip->vendor.locality, 1);
942 if (chip->vendor.irq)
943 free_irq(chip->vendor.irq, chip);
944 iounmap(i->iobase);
945 list_del(&i->list);
946 }
947 mutex_unlock(&tis_lock);
948 #ifdef CONFIG_PNP
949 if (!force) {
950 pnp_unregister_driver(&tis_pnp_driver);
951 return;
952 }
953 #endif
954 platform_device_unregister(pdev);
955 platform_driver_unregister(&tis_drv);
956 }
957
958 module_init(init_tis);
959 module_exit(cleanup_tis);
960 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
961 MODULE_DESCRIPTION("TPM Driver");
962 MODULE_VERSION("2.0");
963 MODULE_LICENSE("GPL");