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[PATCH] aic7xxx_osm build fix
[cris-mirror.git] / drivers / char / tpm / tpm.c
blob87235330fdbe9ced1e186e8e670f919709fd2c9c
1 /*
2 * Copyright (C) 2004 IBM Corporation
3 *
4 * Authors:
5 * Leendert van Doorn <leendert@watson.ibm.com>
6 * Dave Safford <safford@watson.ibm.com>
7 * Reiner Sailer <sailer@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 program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation, version 2 of the
18 * License.
19 *
20 * Note, the TPM chip is not interrupt driven (only polling)
21 * and can have very long timeouts (minutes!). Hence the unusual
22 * calls to schedule_timeout.
23 *
24 */
25
26 #include <linux/sched.h>
27 #include <linux/poll.h>
28 #include <linux/spinlock.h>
29 #include "tpm.h"
30
31 #define TPM_MINOR 224 /* officially assigned */
32
33 #define TPM_BUFSIZE 2048
34
35 /* PCI configuration addresses */
36 #define PCI_GEN_PMCON_1 0xA0
37 #define PCI_GEN1_DEC 0xE4
38 #define PCI_LPC_EN 0xE6
39 #define PCI_GEN2_DEC 0xEC
40
41 static LIST_HEAD(tpm_chip_list);
42 static DEFINE_SPINLOCK(driver_lock);
43 static int dev_mask[32];
44
45 static void user_reader_timeout(unsigned long ptr)
46 {
47 struct tpm_chip *chip = (struct tpm_chip *) ptr;
48
49 down(&chip->buffer_mutex);
50 atomic_set(&chip->data_pending, 0);
51 memset(chip->data_buffer, 0, TPM_BUFSIZE);
52 up(&chip->buffer_mutex);
53 }
54
55 void tpm_time_expired(unsigned long ptr)
56 {
57 int *exp = (int *) ptr;
58 *exp = 1;
59 }
60
61 EXPORT_SYMBOL_GPL(tpm_time_expired);
62
63 /*
64 * Initialize the LPC bus and enable the TPM ports
65 */
66 int tpm_lpc_bus_init(struct pci_dev *pci_dev, u16 base)
67 {
68 u32 lpcenable, tmp;
69 int is_lpcm = 0;
70
71 switch (pci_dev->vendor) {
72 case PCI_VENDOR_ID_INTEL:
73 switch (pci_dev->device) {
74 case PCI_DEVICE_ID_INTEL_82801CA_12:
75 case PCI_DEVICE_ID_INTEL_82801DB_12:
76 is_lpcm = 1;
77 break;
78 }
79 /* init ICH (enable LPC) */
80 pci_read_config_dword(pci_dev, PCI_GEN1_DEC, &lpcenable);
81 lpcenable |= 0x20000000;
82 pci_write_config_dword(pci_dev, PCI_GEN1_DEC, lpcenable);
83
84 if (is_lpcm) {
85 pci_read_config_dword(pci_dev, PCI_GEN1_DEC,
86 &lpcenable);
87 if ((lpcenable & 0x20000000) == 0) {
88 dev_err(&pci_dev->dev,
89 "cannot enable LPC\n");
90 return -ENODEV;
91 }
92 }
93
94 /* initialize TPM registers */
95 pci_read_config_dword(pci_dev, PCI_GEN2_DEC, &tmp);
96
97 if (!is_lpcm)
98 tmp = (tmp & 0xFFFF0000) | (base & 0xFFF0);
99 else
100 tmp =
101 (tmp & 0xFFFF0000) | (base & 0xFFF0) |
102 0x00000001;
103
104 pci_write_config_dword(pci_dev, PCI_GEN2_DEC, tmp);
105
106 if (is_lpcm) {
107 pci_read_config_dword(pci_dev, PCI_GEN_PMCON_1,
108 &tmp);
109 tmp |= 0x00000004; /* enable CLKRUN */
110 pci_write_config_dword(pci_dev, PCI_GEN_PMCON_1,
111 tmp);
112 }
113 tpm_write_index(0x0D, 0x55); /* unlock 4F */
114 tpm_write_index(0x0A, 0x00); /* int disable */
115 tpm_write_index(0x08, base); /* base addr lo */
116 tpm_write_index(0x09, (base & 0xFF00) >> 8); /* base addr hi */
117 tpm_write_index(0x0D, 0xAA); /* lock 4F */
118 break;
119 case PCI_VENDOR_ID_AMD:
120 /* nothing yet */
121 break;
122 }
123
124 return 0;
125 }
126
127 EXPORT_SYMBOL_GPL(tpm_lpc_bus_init);
128
129 /*
130 * Internal kernel interface to transmit TPM commands
131 */
132 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
133 size_t bufsiz)
134 {
135 ssize_t len;
136 u32 count;
137 __be32 *native_size;
138
139 native_size = (__force __be32 *) (buf + 2);
140 count = be32_to_cpu(*native_size);
141
142 if (count == 0)
143 return -ENODATA;
144 if (count > bufsiz) {
145 dev_err(&chip->pci_dev->dev,
146 "invalid count value %x %zx \n", count, bufsiz);
147 return -E2BIG;
148 }
149
150 down(&chip->tpm_mutex);
151
152 if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
153 dev_err(&chip->pci_dev->dev,
154 "tpm_transmit: tpm_send: error %zd\n", len);
155 return len;
156 }
157
158 down(&chip->timer_manipulation_mutex);
159 chip->time_expired = 0;
160 init_timer(&chip->device_timer);
161 chip->device_timer.function = tpm_time_expired;
162 chip->device_timer.expires = jiffies + 2 * 60 * HZ;
163 chip->device_timer.data = (unsigned long) &chip->time_expired;
164 add_timer(&chip->device_timer);
165 up(&chip->timer_manipulation_mutex);
166
167 do {
168 u8 status = inb(chip->vendor->base + 1);
169 if ((status & chip->vendor->req_complete_mask) ==
170 chip->vendor->req_complete_val) {
171 down(&chip->timer_manipulation_mutex);
172 del_singleshot_timer_sync(&chip->device_timer);
173 up(&chip->timer_manipulation_mutex);
174 goto out_recv;
175 }
176 set_current_state(TASK_UNINTERRUPTIBLE);
177 schedule_timeout(TPM_TIMEOUT);
178 rmb();
179 } while (!chip->time_expired);
180
181
182 chip->vendor->cancel(chip);
183 dev_err(&chip->pci_dev->dev, "Time expired\n");
184 up(&chip->tpm_mutex);
185 return -EIO;
186
187 out_recv:
188 len = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
189 if (len < 0)
190 dev_err(&chip->pci_dev->dev,
191 "tpm_transmit: tpm_recv: error %zd\n", len);
192 up(&chip->tpm_mutex);
193 return len;
194 }
195
196 #define TPM_DIGEST_SIZE 20
197 #define CAP_PCR_RESULT_SIZE 18
198 static u8 cap_pcr[] = {
199 0, 193, /* TPM_TAG_RQU_COMMAND */
200 0, 0, 0, 22, /* length */
201 0, 0, 0, 101, /* TPM_ORD_GetCapability */
202 0, 0, 0, 5,
203 0, 0, 0, 4,
204 0, 0, 1, 1
205 };
206
207 #define READ_PCR_RESULT_SIZE 30
208 static u8 pcrread[] = {
209 0, 193, /* TPM_TAG_RQU_COMMAND */
210 0, 0, 0, 14, /* length */
211 0, 0, 0, 21, /* TPM_ORD_PcrRead */
212 0, 0, 0, 0 /* PCR index */
213 };
214
215 static ssize_t show_pcrs(struct device *dev, char *buf)
216 {
217 u8 data[READ_PCR_RESULT_SIZE];
218 ssize_t len;
219 int i, j, index, num_pcrs;
220 char *str = buf;
221
222 struct tpm_chip *chip =
223 pci_get_drvdata(container_of(dev, struct pci_dev, dev));
224 if (chip == NULL)
225 return -ENODEV;
226
227 memcpy(data, cap_pcr, sizeof(cap_pcr));
228 if ((len = tpm_transmit(chip, data, sizeof(data)))
229 < CAP_PCR_RESULT_SIZE)
230 return len;
231
232 num_pcrs = be32_to_cpu(*((__force __be32 *) (data + 14)));
233
234 for (i = 0; i < num_pcrs; i++) {
235 memcpy(data, pcrread, sizeof(pcrread));
236 index = cpu_to_be32(i);
237 memcpy(data + 10, &index, 4);
238 if ((len = tpm_transmit(chip, data, sizeof(data)))
239 < READ_PCR_RESULT_SIZE)
240 return len;
241 str += sprintf(str, "PCR-%02d: ", i);
242 for (j = 0; j < TPM_DIGEST_SIZE; j++)
243 str += sprintf(str, "%02X ", *(data + 10 + j));
244 str += sprintf(str, "\n");
245 }
246 return str - buf;
247 }
248
249 static DEVICE_ATTR(pcrs, S_IRUGO, show_pcrs, NULL);
250
251 #define READ_PUBEK_RESULT_SIZE 314
252 static u8 readpubek[] = {
253 0, 193, /* TPM_TAG_RQU_COMMAND */
254 0, 0, 0, 30, /* length */
255 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
256 };
257
258 static ssize_t show_pubek(struct device *dev, char *buf)
259 {
260 u8 data[READ_PUBEK_RESULT_SIZE];
261 ssize_t len;
262 __be32 *native_val;
263 int i;
264 char *str = buf;
265
266 struct tpm_chip *chip =
267 pci_get_drvdata(container_of(dev, struct pci_dev, dev));
268 if (chip == NULL)
269 return -ENODEV;
270
271 memcpy(data, readpubek, sizeof(readpubek));
272 memset(data + sizeof(readpubek), 0, 20); /* zero nonce */
273
274 if ((len = tpm_transmit(chip, data, sizeof(data))) <
275 READ_PUBEK_RESULT_SIZE)
276 return len;
277
278 /*
279 ignore header 10 bytes
280 algorithm 32 bits (1 == RSA )
281 encscheme 16 bits
282 sigscheme 16 bits
283 parameters (RSA 12->bytes: keybit, #primes, expbit)
284 keylenbytes 32 bits
285 256 byte modulus
286 ignore checksum 20 bytes
287 */
288
289 native_val = (__force __be32 *) (data + 34);
290
291 str +=
292 sprintf(str,
293 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
294 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
295 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
296 "Modulus length: %d\nModulus: \n",
297 data[10], data[11], data[12], data[13], data[14],
298 data[15], data[16], data[17], data[22], data[23],
299 data[24], data[25], data[26], data[27], data[28],
300 data[29], data[30], data[31], data[32], data[33],
301 be32_to_cpu(*native_val)
302 );
303
304 for (i = 0; i < 256; i++) {
305 str += sprintf(str, "%02X ", data[i + 39]);
306 if ((i + 1) % 16 == 0)
307 str += sprintf(str, "\n");
308 }
309 return str - buf;
310 }
311
312 static DEVICE_ATTR(pubek, S_IRUGO, show_pubek, NULL);
313
314 #define CAP_VER_RESULT_SIZE 18
315 static u8 cap_version[] = {
316 0, 193, /* TPM_TAG_RQU_COMMAND */
317 0, 0, 0, 18, /* length */
318 0, 0, 0, 101, /* TPM_ORD_GetCapability */
319 0, 0, 0, 6,
320 0, 0, 0, 0
321 };
322
323 #define CAP_MANUFACTURER_RESULT_SIZE 18
324 static u8 cap_manufacturer[] = {
325 0, 193, /* TPM_TAG_RQU_COMMAND */
326 0, 0, 0, 22, /* length */
327 0, 0, 0, 101, /* TPM_ORD_GetCapability */
328 0, 0, 0, 5,
329 0, 0, 0, 4,
330 0, 0, 1, 3
331 };
332
333 static ssize_t show_caps(struct device *dev, char *buf)
334 {
335 u8 data[READ_PUBEK_RESULT_SIZE];
336 ssize_t len;
337 char *str = buf;
338
339 struct tpm_chip *chip =
340 pci_get_drvdata(container_of(dev, struct pci_dev, dev));
341 if (chip == NULL)
342 return -ENODEV;
343
344 memcpy(data, cap_manufacturer, sizeof(cap_manufacturer));
345
346 if ((len = tpm_transmit(chip, data, sizeof(data))) <
347 CAP_MANUFACTURER_RESULT_SIZE)
348 return len;
349
350 str += sprintf(str, "Manufacturer: 0x%x\n",
351 be32_to_cpu(*(data + 14)));
352
353 memcpy(data, cap_version, sizeof(cap_version));
354
355 if ((len = tpm_transmit(chip, data, sizeof(data))) <
356 CAP_VER_RESULT_SIZE)
357 return len;
358
359 str +=
360 sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n",
361 (int) data[14], (int) data[15], (int) data[16],
362 (int) data[17]);
363
364 return str - buf;
365 }
366
367 static DEVICE_ATTR(caps, S_IRUGO, show_caps, NULL);
368
369 /*
370 * Device file system interface to the TPM
371 */
372 int tpm_open(struct inode *inode, struct file *file)
373 {
374 int rc = 0, minor = iminor(inode);
375 struct tpm_chip *chip = NULL, *pos;
376
377 spin_lock(&driver_lock);
378
379 list_for_each_entry(pos, &tpm_chip_list, list) {
380 if (pos->vendor->miscdev.minor == minor) {
381 chip = pos;
382 break;
383 }
384 }
385
386 if (chip == NULL) {
387 rc = -ENODEV;
388 goto err_out;
389 }
390
391 if (chip->num_opens) {
392 dev_dbg(&chip->pci_dev->dev,
393 "Another process owns this TPM\n");
394 rc = -EBUSY;
395 goto err_out;
396 }
397
398 chip->num_opens++;
399 pci_dev_get(chip->pci_dev);
400
401 spin_unlock(&driver_lock);
402
403 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
404 if (chip->data_buffer == NULL) {
405 chip->num_opens--;
406 pci_dev_put(chip->pci_dev);
407 return -ENOMEM;
408 }
409
410 atomic_set(&chip->data_pending, 0);
411
412 file->private_data = chip;
413 return 0;
414
415 err_out:
416 spin_unlock(&driver_lock);
417 return rc;
418 }
419
420 EXPORT_SYMBOL_GPL(tpm_open);
421
422 int tpm_release(struct inode *inode, struct file *file)
423 {
424 struct tpm_chip *chip = file->private_data;
425
426 file->private_data = NULL;
427
428 spin_lock(&driver_lock);
429 chip->num_opens--;
430 spin_unlock(&driver_lock);
431
432 down(&chip->timer_manipulation_mutex);
433 if (timer_pending(&chip->user_read_timer))
434 del_singleshot_timer_sync(&chip->user_read_timer);
435 else if (timer_pending(&chip->device_timer))
436 del_singleshot_timer_sync(&chip->device_timer);
437 up(&chip->timer_manipulation_mutex);
438
439 kfree(chip->data_buffer);
440 atomic_set(&chip->data_pending, 0);
441
442 pci_dev_put(chip->pci_dev);
443 return 0;
444 }
445
446 EXPORT_SYMBOL_GPL(tpm_release);
447
448 ssize_t tpm_write(struct file * file, const char __user * buf,
449 size_t size, loff_t * off)
450 {
451 struct tpm_chip *chip = file->private_data;
452 int in_size = size, out_size;
453
454 /* cannot perform a write until the read has cleared
455 either via tpm_read or a user_read_timer timeout */
456 while (atomic_read(&chip->data_pending) != 0) {
457 set_current_state(TASK_UNINTERRUPTIBLE);
458 schedule_timeout(TPM_TIMEOUT);
459 }
460
461 down(&chip->buffer_mutex);
462
463 if (in_size > TPM_BUFSIZE)
464 in_size = TPM_BUFSIZE;
465
466 if (copy_from_user
467 (chip->data_buffer, (void __user *) buf, in_size)) {
468 up(&chip->buffer_mutex);
469 return -EFAULT;
470 }
471
472 /* atomic tpm command send and result receive */
473 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
474
475 atomic_set(&chip->data_pending, out_size);
476 up(&chip->buffer_mutex);
477
478 /* Set a timeout by which the reader must come claim the result */
479 down(&chip->timer_manipulation_mutex);
480 init_timer(&chip->user_read_timer);
481 chip->user_read_timer.function = user_reader_timeout;
482 chip->user_read_timer.data = (unsigned long) chip;
483 chip->user_read_timer.expires = jiffies + (60 * HZ);
484 add_timer(&chip->user_read_timer);
485 up(&chip->timer_manipulation_mutex);
486
487 return in_size;
488 }
489
490 EXPORT_SYMBOL_GPL(tpm_write);
491
492 ssize_t tpm_read(struct file * file, char __user * buf,
493 size_t size, loff_t * off)
494 {
495 struct tpm_chip *chip = file->private_data;
496 int ret_size = -ENODATA;
497
498 if (atomic_read(&chip->data_pending) != 0) { /* Result available */
499 down(&chip->timer_manipulation_mutex);
500 del_singleshot_timer_sync(&chip->user_read_timer);
501 up(&chip->timer_manipulation_mutex);
502
503 down(&chip->buffer_mutex);
504
505 ret_size = atomic_read(&chip->data_pending);
506 atomic_set(&chip->data_pending, 0);
507
508 if (ret_size == 0) /* timeout just occurred */
509 ret_size = -ETIME;
510 else if (ret_size > 0) { /* relay data */
511 if (size < ret_size)
512 ret_size = size;
513
514 if (copy_to_user((void __user *) buf,
515 chip->data_buffer, ret_size)) {
516 ret_size = -EFAULT;
517 }
518 }
519 up(&chip->buffer_mutex);
520 }
521
522 return ret_size;
523 }
524
525 EXPORT_SYMBOL_GPL(tpm_read);
526
527 void __devexit tpm_remove(struct pci_dev *pci_dev)
528 {
529 struct tpm_chip *chip = pci_get_drvdata(pci_dev);
530
531 if (chip == NULL) {
532 dev_err(&pci_dev->dev, "No device data found\n");
533 return;
534 }
535
536 spin_lock(&driver_lock);
537
538 list_del(&chip->list);
539
540 spin_unlock(&driver_lock);
541
542 pci_set_drvdata(pci_dev, NULL);
543 misc_deregister(&chip->vendor->miscdev);
544
545 device_remove_file(&pci_dev->dev, &dev_attr_pubek);
546 device_remove_file(&pci_dev->dev, &dev_attr_pcrs);
547 device_remove_file(&pci_dev->dev, &dev_attr_caps);
548
549 pci_disable_device(pci_dev);
550
551 dev_mask[chip->dev_num / 32] &= !(1 << (chip->dev_num % 32));
552
553 kfree(chip);
554
555 pci_dev_put(pci_dev);
556 }
557
558 EXPORT_SYMBOL_GPL(tpm_remove);
559
560 static u8 savestate[] = {
561 0, 193, /* TPM_TAG_RQU_COMMAND */
562 0, 0, 0, 10, /* blob length (in bytes) */
563 0, 0, 0, 152 /* TPM_ORD_SaveState */
564 };
565
566 /*
567 * We are about to suspend. Save the TPM state
568 * so that it can be restored.
569 */
570 int tpm_pm_suspend(struct pci_dev *pci_dev, pm_message_t pm_state)
571 {
572 struct tpm_chip *chip = pci_get_drvdata(pci_dev);
573 if (chip == NULL)
574 return -ENODEV;
575
576 tpm_transmit(chip, savestate, sizeof(savestate));
577 return 0;
578 }
579
580 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
581
582 /*
583 * Resume from a power safe. The BIOS already restored
584 * the TPM state.
585 */
586 int tpm_pm_resume(struct pci_dev *pci_dev)
587 {
588 struct tpm_chip *chip = pci_get_drvdata(pci_dev);
589
590 if (chip == NULL)
591 return -ENODEV;
592
593 spin_lock(&driver_lock);
594 tpm_lpc_bus_init(pci_dev, chip->vendor->base);
595 spin_unlock(&driver_lock);
596
597 return 0;
598 }
599
600 EXPORT_SYMBOL_GPL(tpm_pm_resume);
601
602 /*
603 * Called from tpm_<specific>.c probe function only for devices
604 * the driver has determined it should claim. Prior to calling
605 * this function the specific probe function has called pci_enable_device
606 * upon errant exit from this function specific probe function should call
607 * pci_disable_device
608 */
609 int tpm_register_hardware(struct pci_dev *pci_dev,
610 struct tpm_vendor_specific *entry)
611 {
612 char devname[7];
613 struct tpm_chip *chip;
614 int i, j;
615
616 /* Driver specific per-device data */
617 chip = kmalloc(sizeof(*chip), GFP_KERNEL);
618 if (chip == NULL)
619 return -ENOMEM;
620
621 memset(chip, 0, sizeof(struct tpm_chip));
622
623 init_MUTEX(&chip->buffer_mutex);
624 init_MUTEX(&chip->tpm_mutex);
625 init_MUTEX(&chip->timer_manipulation_mutex);
626 INIT_LIST_HEAD(&chip->list);
627
628 chip->vendor = entry;
629
630 chip->dev_num = -1;
631
632 for (i = 0; i < 32; i++)
633 for (j = 0; j < 8; j++)
634 if ((dev_mask[i] & (1 << j)) == 0) {
635 chip->dev_num = i * 32 + j;
636 dev_mask[i] |= 1 << j;
637 goto dev_num_search_complete;
638 }
639
640 dev_num_search_complete:
641 if (chip->dev_num < 0) {
642 dev_err(&pci_dev->dev,
643 "No available tpm device numbers\n");
644 kfree(chip);
645 return -ENODEV;
646 } else if (chip->dev_num == 0)
647 chip->vendor->miscdev.minor = TPM_MINOR;
648 else
649 chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR;
650
651 snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num);
652 chip->vendor->miscdev.name = devname;
653
654 chip->vendor->miscdev.dev = &(pci_dev->dev);
655 chip->pci_dev = pci_dev_get(pci_dev);
656
657 if (misc_register(&chip->vendor->miscdev)) {
658 dev_err(&chip->pci_dev->dev,
659 "unable to misc_register %s, minor %d\n",
660 chip->vendor->miscdev.name,
661 chip->vendor->miscdev.minor);
662 pci_dev_put(pci_dev);
663 kfree(chip);
664 dev_mask[i] &= !(1 << j);
665 return -ENODEV;
666 }
667
668 pci_set_drvdata(pci_dev, chip);
669
670 list_add(&chip->list, &tpm_chip_list);
671
672 device_create_file(&pci_dev->dev, &dev_attr_pubek);
673 device_create_file(&pci_dev->dev, &dev_attr_pcrs);
674 device_create_file(&pci_dev->dev, &dev_attr_caps);
675
676 return 0;
677 }
678
679 EXPORT_SYMBOL_GPL(tpm_register_hardware);
680
681 static int __init init_tpm(void)
682 {
683 return 0;
684 }
685
686 static void __exit cleanup_tpm(void)
687 {
688
689 }
690
691 module_init(init_tpm);
692 module_exit(cleanup_tpm);
693
694 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
695 MODULE_DESCRIPTION("TPM Driver");
696 MODULE_VERSION("2.0");
697 MODULE_LICENSE("GPL");
CRIS linux kernel tree