tpm_infineon.c 11.4 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
/*
 * Description:
 * Device Driver for the Infineon Technologies
 * SLD 9630 TT Trusted Platform Module
 * Specifications at www.trustedcomputinggroup.org
 *
 * Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
 * Applied Data Security Group, Ruhr-University Bochum, Germany
 * Project-Homepage: http://www.prosec.rub.de/tpm
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 *
 */

#include "tpm.h"

/* Infineon specific definitions */
/* maximum number of WTX-packages */
#define	TPM_MAX_WTX_PACKAGES 	50
/* msleep-Time for WTX-packages */
#define	TPM_WTX_MSLEEP_TIME 	20
/* msleep-Time --> Interval to check status register */
#define	TPM_MSLEEP_TIME 	3
/* gives number of max. msleep()-calls before throwing timeout */
#define	TPM_MAX_TRIES		5000
#define	TCPA_INFINEON_DEV_VEN_VALUE	0x15D1
#define	TPM_DATA 			(TPM_ADDR + 1) & 0xff

/* TPM header definitions */
enum infineon_tpm_header {
	TPM_VL_VER = 0x01,
	TPM_VL_CHANNEL_CONTROL = 0x07,
	TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
	TPM_VL_CHANNEL_TPM = 0x0B,
	TPM_VL_CONTROL = 0x00,
	TPM_INF_NAK = 0x15,
	TPM_CTRL_WTX = 0x10,
	TPM_CTRL_WTX_ABORT = 0x18,
	TPM_CTRL_WTX_ABORT_ACK = 0x18,
	TPM_CTRL_ERROR = 0x20,
	TPM_CTRL_CHAININGACK = 0x40,
	TPM_CTRL_CHAINING = 0x80,
	TPM_CTRL_DATA = 0x04,
	TPM_CTRL_DATA_CHA = 0x84,
	TPM_CTRL_DATA_CHA_ACK = 0xC4
};

enum infineon_tpm_register {
	WRFIFO = 0x00,
	RDFIFO = 0x01,
	STAT = 0x02,
	CMD = 0x03
};

enum infineon_tpm_command_bits {
	CMD_DIS = 0x00,
	CMD_LP = 0x01,
	CMD_RES = 0x02,
	CMD_IRQC = 0x06
};

enum infineon_tpm_status_bits {
	STAT_XFE = 0x00,
	STAT_LPA = 0x01,
	STAT_FOK = 0x02,
	STAT_TOK = 0x03,
	STAT_IRQA = 0x06,
	STAT_RDA = 0x07
};

/* some outgoing values */
enum infineon_tpm_values {
	CHIP_ID1 = 0x20,
	CHIP_ID2 = 0x21,
78
	TPM_DAR = 0x30,
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
	RESET_LP_IRQC_DISABLE = 0x41,
	ENABLE_REGISTER_PAIR = 0x55,
	IOLIMH = 0x60,
	IOLIML = 0x61,
	DISABLE_REGISTER_PAIR = 0xAA,
	IDVENL = 0xF1,
	IDVENH = 0xF2,
	IDPDL = 0xF3,
	IDPDH = 0xF4
};

static int number_of_wtx;

static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
{
	int status;
	int check = 0;
	int i;

	if (clear_wrfifo) {
		for (i = 0; i < 4096; i++) {
			status = inb(chip->vendor->base + WRFIFO);
			if (status == 0xff) {
				if (check == 5)
					break;
				else
					check++;
			}
		}
	}
	/* Note: The values which are currently in the FIFO of the TPM
	   are thrown away since there is no usage for them. Usually,
	   this has nothing to say, since the TPM will give its answer
	   immediately or will be aborted anyway, so the data here is
	   usually garbage and useless.
	   We have to clean this, because the next communication with
	   the TPM would be rubbish, if there is still some old data
	   in the Read FIFO.
	 */
	i = 0;
	do {
		status = inb(chip->vendor->base + RDFIFO);
		status = inb(chip->vendor->base + STAT);
		i++;
		if (i == TPM_MAX_TRIES)
			return -EIO;
	} while ((status & (1 << STAT_RDA)) != 0);
	return 0;
}

static int wait(struct tpm_chip *chip, int wait_for_bit)
{
	int status;
	int i;
	for (i = 0; i < TPM_MAX_TRIES; i++) {
		status = inb(chip->vendor->base + STAT);
		/* check the status-register if wait_for_bit is set */
		if (status & 1 << wait_for_bit)
			break;
		msleep(TPM_MSLEEP_TIME);
	}
	if (i == TPM_MAX_TRIES) {	/* timeout occurs */
		if (wait_for_bit == STAT_XFE)
			dev_err(&chip->pci_dev->dev,
				"Timeout in wait(STAT_XFE)\n");
		if (wait_for_bit == STAT_RDA)
			dev_err(&chip->pci_dev->dev,
				"Timeout in wait(STAT_RDA)\n");
		return -EIO;
	}
	return 0;
};

static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
{
	wait(chip, STAT_XFE);
	outb(sendbyte, chip->vendor->base + WRFIFO);
}

    /* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
       calculation time, it sends a WTX-package, which has to be acknowledged
       or aborted. This usually occurs if you are hammering the TPM with key
       creation. Set the maximum number of WTX-packages in the definitions
       above, if the number is reached, the waiting-time will be denied
       and the TPM command has to be resend.
     */

static void tpm_wtx(struct tpm_chip *chip)
{
	number_of_wtx++;
	dev_info(&chip->pci_dev->dev, "Granting WTX (%02d / %02d)\n",
		 number_of_wtx, TPM_MAX_WTX_PACKAGES);
	wait_and_send(chip, TPM_VL_VER);
	wait_and_send(chip, TPM_CTRL_WTX);
	wait_and_send(chip, 0x00);
	wait_and_send(chip, 0x00);
	msleep(TPM_WTX_MSLEEP_TIME);
}

static void tpm_wtx_abort(struct tpm_chip *chip)
{
	dev_info(&chip->pci_dev->dev, "Aborting WTX\n");
	wait_and_send(chip, TPM_VL_VER);
	wait_and_send(chip, TPM_CTRL_WTX_ABORT);
	wait_and_send(chip, 0x00);
	wait_and_send(chip, 0x00);
	number_of_wtx = 0;
	msleep(TPM_WTX_MSLEEP_TIME);
}

static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
{
	int i;
	int ret;
	u32 size = 0;

recv_begin:
	/* start receiving header */
	for (i = 0; i < 4; i++) {
		ret = wait(chip, STAT_RDA);
		if (ret)
			return -EIO;
		buf[i] = inb(chip->vendor->base + RDFIFO);
	}

	if (buf[0] != TPM_VL_VER) {
		dev_err(&chip->pci_dev->dev,
			"Wrong transport protocol implementation!\n");
		return -EIO;
	}

	if (buf[1] == TPM_CTRL_DATA) {
		/* size of the data received */
		size = ((buf[2] << 8) | buf[3]);

		for (i = 0; i < size; i++) {
			wait(chip, STAT_RDA);
			buf[i] = inb(chip->vendor->base + RDFIFO);
		}

		if ((size == 0x6D00) && (buf[1] == 0x80)) {
			dev_err(&chip->pci_dev->dev,
				"Error handling on vendor layer!\n");
			return -EIO;
		}

		for (i = 0; i < size; i++)
			buf[i] = buf[i + 6];

		size = size - 6;
		return size;
	}

	if (buf[1] == TPM_CTRL_WTX) {
		dev_info(&chip->pci_dev->dev, "WTX-package received\n");
		if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
			tpm_wtx(chip);
			goto recv_begin;
		} else {
			tpm_wtx_abort(chip);
			goto recv_begin;
		}
	}

	if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
		dev_info(&chip->pci_dev->dev, "WTX-abort acknowledged\n");
		return size;
	}

	if (buf[1] == TPM_CTRL_ERROR) {
		dev_err(&chip->pci_dev->dev, "ERROR-package received:\n");
		if (buf[4] == TPM_INF_NAK)
			dev_err(&chip->pci_dev->dev,
				"-> Negative acknowledgement"
				" - retransmit command!\n");
		return -EIO;
	}
	return -EIO;
}

static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
{
	int i;
	int ret;
	u8 count_high, count_low, count_4, count_3, count_2, count_1;

	/* Disabling Reset, LP and IRQC */
	outb(RESET_LP_IRQC_DISABLE, chip->vendor->base + CMD);

	ret = empty_fifo(chip, 1);
	if (ret) {
		dev_err(&chip->pci_dev->dev, "Timeout while clearing FIFO\n");
		return -EIO;
	}

	ret = wait(chip, STAT_XFE);
	if (ret)
		return -EIO;

	count_4 = (count & 0xff000000) >> 24;
	count_3 = (count & 0x00ff0000) >> 16;
	count_2 = (count & 0x0000ff00) >> 8;
	count_1 = (count & 0x000000ff);
	count_high = ((count + 6) & 0xffffff00) >> 8;
	count_low = ((count + 6) & 0x000000ff);

	/* Sending Header */
	wait_and_send(chip, TPM_VL_VER);
	wait_and_send(chip, TPM_CTRL_DATA);
	wait_and_send(chip, count_high);
	wait_and_send(chip, count_low);

	/* Sending Data Header */
	wait_and_send(chip, TPM_VL_VER);
	wait_and_send(chip, TPM_VL_CHANNEL_TPM);
	wait_and_send(chip, count_4);
	wait_and_send(chip, count_3);
	wait_and_send(chip, count_2);
	wait_and_send(chip, count_1);

	/* Sending Data */
	for (i = 0; i < count; i++) {
		wait_and_send(chip, buf[i]);
	}
	return count;
}

static void tpm_inf_cancel(struct tpm_chip *chip)
{
	/* Nothing yet!
	   This has something to do with the internal functions
	   of the TPM. Abort isn't really necessary...
	 */
}

static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);

static struct attribute *inf_attrs[] = {
	&dev_attr_pubek.attr,
	&dev_attr_pcrs.attr,
	&dev_attr_caps.attr,
	&dev_attr_cancel.attr,
	NULL,
};

static struct attribute_group inf_attr_grp = {.attrs = inf_attrs };

static struct file_operations inf_ops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.open = tpm_open,
	.read = tpm_read,
	.write = tpm_write,
	.release = tpm_release,
};

static struct tpm_vendor_specific tpm_inf = {
	.recv = tpm_inf_recv,
	.send = tpm_inf_send,
	.cancel = tpm_inf_cancel,
	.req_complete_mask = 0,
	.req_complete_val = 0,
	.attr_group = &inf_attr_grp,
	.miscdev = {.fops = &inf_ops,},
};

static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
				   const struct pci_device_id *pci_id)
{
	int rc = 0;
	u8 iol, ioh;
	int vendorid[2];
	int version[2];
	int productid[2];

	if (pci_enable_device(pci_dev))
		return -EIO;

	dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);

	/* query chip for its vendor, its version number a.s.o. */
	outb(ENABLE_REGISTER_PAIR, TPM_ADDR);
	outb(IDVENL, TPM_ADDR);
	vendorid[1] = inb(TPM_DATA);
	outb(IDVENH, TPM_ADDR);
	vendorid[0] = inb(TPM_DATA);
	outb(IDPDL, TPM_ADDR);
	productid[1] = inb(TPM_DATA);
	outb(IDPDH, TPM_ADDR);
	productid[0] = inb(TPM_DATA);
	outb(CHIP_ID1, TPM_ADDR);
	version[1] = inb(TPM_DATA);
	outb(CHIP_ID2, TPM_ADDR);
	version[0] = inb(TPM_DATA);

	if ((vendorid[0] << 8 | vendorid[1]) == (TCPA_INFINEON_DEV_VEN_VALUE)) {

		/* read IO-ports from TPM */
		outb(IOLIMH, TPM_ADDR);
		ioh = inb(TPM_DATA);
		outb(IOLIML, TPM_ADDR);
		iol = inb(TPM_DATA);
		tpm_inf.base = (ioh << 8) | iol;

		if (tpm_inf.base == 0) {
			dev_err(&pci_dev->dev, "No IO-ports set!\n");
			pci_disable_device(pci_dev);
			return -ENODEV;
		}

		/* activate register */
393
		outb(TPM_DAR, TPM_ADDR);
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
		outb(0x01, TPM_DATA);
		outb(DISABLE_REGISTER_PAIR, TPM_ADDR);

		/* disable RESET, LP and IRQC */
		outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);

		/* Finally, we're done, print some infos */
		dev_info(&pci_dev->dev, "TPM found: "
			 "io base 0x%x, "
			 "chip version %02x%02x, "
			 "vendor id %x%x (Infineon), "
			 "product id %02x%02x"
			 "%s\n",
			 tpm_inf.base,
			 version[0], version[1],
			 vendorid[0], vendorid[1],
			 productid[0], productid[1], ((productid[0] == 0)
						      && (productid[1] ==
							  6)) ?
			 " (SLD 9630 TT 1.1)" : "");

		rc = tpm_register_hardware(pci_dev, &tpm_inf);
		if (rc < 0) {
			pci_disable_device(pci_dev);
			return -ENODEV;
		}
		return 0;
	} else {
		dev_info(&pci_dev->dev, "No Infineon TPM found!\n");
		pci_disable_device(pci_dev);
		return -ENODEV;
	}
}

static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2)},
	{0,}
};

MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);

static struct pci_driver inf_pci_driver = {
	.name = "tpm_inf",
	.id_table = tpm_pci_tbl,
	.probe = tpm_inf_probe,
	.remove = __devexit_p(tpm_remove),
	.suspend = tpm_pm_suspend,
	.resume = tpm_pm_resume,
};

static int __init init_inf(void)
{
	return pci_register_driver(&inf_pci_driver);
}

static void __exit cleanup_inf(void)
{
	pci_unregister_driver(&inf_pci_driver);
}

module_init(init_inf);
module_exit(cleanup_inf);

MODULE_AUTHOR("Marcel Selhorst <selhorst@crypto.rub.de>");
MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT");
MODULE_VERSION("1.4");
MODULE_LICENSE("GPL");