1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2011 Infineon Technologies
4  *
5  * Authors:
6  * Peter Huewe <huewe.external@infineon.com>
7  *
8  * Description:
9  * Device driver for TCG/TCPA TPM (trusted platform module).
10  * Specifications at www.trustedcomputinggroup.org
11  *
12  * This device driver implements the TPM interface as defined in
13  * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
14  * Infineon I2C Protocol Stack Specification v0.20.
15  *
16  * It is based on the Linux kernel driver tpm.c from Leendert van
17  * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
18  *
19  * Version: 2.1.1
20  */
21 
22 #include <common.h>
23 #include <dm.h>
24 #include <fdtdec.h>
25 #include <i2c.h>
26 #include <tpm-v1.h>
27 #include <linux/errno.h>
28 #include <linux/compiler.h>
29 #include <linux/types.h>
30 #include <linux/unaligned/be_byteshift.h>
31 
32 #include "tpm_tis.h"
33 #include "tpm_internal.h"
34 
35 enum i2c_chip_type {
36 	SLB9635,
37 	SLB9645,
38 	UNKNOWN,
39 };
40 
41 /* expected value for DIDVID register */
42 #define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
43 #define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
44 
45 static const char * const chip_name[] = {
46 	[SLB9635] = "slb9635tt",
47 	[SLB9645] = "slb9645tt",
48 	[UNKNOWN] = "unknown/fallback to slb9635",
49 };
50 
51 #define	TPM_ACCESS(l)			(0x0000 | ((l) << 4))
52 #define	TPM_STS(l)			(0x0001 | ((l) << 4))
53 #define	TPM_DATA_FIFO(l)		(0x0005 | ((l) << 4))
54 #define	TPM_DID_VID(l)			(0x0006 | ((l) << 4))
55 
56 /*
57  * tpm_tis_i2c_read() - read from TPM register
58  * @addr: register address to read from
59  * @buffer: provided by caller
60  * @len: number of bytes to read
61  *
62  * Read len bytes from TPM register and put them into
63  * buffer (little-endian format, i.e. first byte is put into buffer[0]).
64  *
65  * NOTE: TPM is big-endian for multi-byte values. Multi-byte
66  * values have to be swapped.
67  *
68  * Return -EIO on error, 0 on success.
69  */
tpm_tis_i2c_read(struct udevice * dev,u8 addr,u8 * buffer,size_t len)70 static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer,
71 			    size_t len)
72 {
73 	struct tpm_chip *chip = dev_get_priv(dev);
74 	int rc;
75 	int count;
76 	uint32_t addrbuf = addr;
77 
78 	if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) {
79 		/* slb9635 protocol should work in both cases */
80 		for (count = 0; count < MAX_COUNT; count++) {
81 			rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1);
82 			if (rc == 0)
83 				break;  /* Success, break to skip sleep */
84 			udelay(SLEEP_DURATION_US);
85 		}
86 		if (rc)
87 			return rc;
88 
89 		/* After the TPM has successfully received the register address
90 		 * it needs some time, thus we're sleeping here again, before
91 		 * retrieving the data
92 		 */
93 		for (count = 0; count < MAX_COUNT; count++) {
94 			udelay(SLEEP_DURATION_US);
95 			rc = dm_i2c_read(dev, 0, buffer, len);
96 			if (rc == 0)
97 				break;  /* success, break to skip sleep */
98 		}
99 	} else {
100 		/*
101 		 * Use a combined read for newer chips.
102 		 * Unfortunately the smbus functions are not suitable due to
103 		 * the 32 byte limit of the smbus.
104 		 * Retries should usually not be needed, but are kept just to
105 		 * be safe on the safe side.
106 		 */
107 		for (count = 0; count < MAX_COUNT; count++) {
108 			rc = dm_i2c_read(dev, addr, buffer, len);
109 			if (rc == 0)
110 				break;  /* break here to skip sleep */
111 			udelay(SLEEP_DURATION_US);
112 		}
113 	}
114 
115 	/* Take care of 'guard time' */
116 	udelay(SLEEP_DURATION_US);
117 	if (rc)
118 		return rc;
119 
120 	return 0;
121 }
122 
tpm_tis_i2c_write_generic(struct udevice * dev,u8 addr,const u8 * buffer,size_t len,unsigned int sleep_time_us,u8 max_count)123 static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr,
124 				     const u8 *buffer, size_t len,
125 				     unsigned int sleep_time_us, u8 max_count)
126 {
127 	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
128 	struct tpm_chip *chip = dev_get_priv(dev);
129 	int rc = 0;
130 	int count;
131 
132 	if (chip->chip_type == SLB9635) {
133 		/* Prepare send buffer to include the address */
134 		priv->buf[0] = addr;
135 		memcpy(&(priv->buf[1]), buffer, len);
136 		buffer = priv->buf;
137 		len++;
138 		addr = 0;
139 	}
140 
141 	for (count = 0; count < max_count; count++) {
142 		rc = dm_i2c_write(dev, addr, buffer, len);
143 		if (rc == 0)
144 			break;  /* Success, break to skip sleep */
145 		udelay(sleep_time_us);
146 	}
147 
148 	/* take care of 'guard time' */
149 	udelay(sleep_time_us);
150 	if (rc)
151 		return rc;
152 
153 	return 0;
154 }
155 
156 /*
157  * tpm_tis_i2c_write() - write to TPM register
158  * @addr: register address to write to
159  * @buffer: containing data to be written
160  * @len: number of bytes to write
161  *
162  * Write len bytes from provided buffer to TPM register (little
163  * endian format, i.e. buffer[0] is written as first byte).
164  *
165  * NOTE: TPM is big-endian for multi-byte values. Multi-byte
166  * values have to be swapped.
167  *
168  * NOTE: use this function instead of the tpm_tis_i2c_write_generic function.
169  *
170  * Return -EIO on error, 0 on success
171  */
tpm_tis_i2c_write(struct udevice * dev,u8 addr,const u8 * buffer,size_t len)172 static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer,
173 			     size_t len)
174 {
175 	return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
176 					 SLEEP_DURATION_US, MAX_COUNT);
177 }
178 
179 /*
180  * This function is needed especially for the cleanup situation after
181  * sending TPM_READY
182  */
tpm_tis_i2c_write_long(struct udevice * dev,u8 addr,u8 * buffer,size_t len)183 static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer,
184 				  size_t len)
185 {
186 	return tpm_tis_i2c_write_generic(dev, addr, buffer, len,
187 					 SLEEP_DURATION_LONG_US,
188 					 MAX_COUNT_LONG);
189 }
190 
tpm_tis_i2c_check_locality(struct udevice * dev,int loc)191 static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc)
192 {
193 	const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
194 	struct tpm_chip *chip = dev_get_priv(dev);
195 	u8 buf;
196 	int rc;
197 
198 	rc = tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1);
199 	if (rc < 0)
200 		return rc;
201 
202 	if ((buf & mask) == mask) {
203 		chip->locality = loc;
204 		return loc;
205 	}
206 
207 	return -ENOENT;
208 }
209 
tpm_tis_i2c_release_locality(struct udevice * dev,int loc,int force)210 static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc,
211 					 int force)
212 {
213 	const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
214 	u8 buf;
215 
216 	if (tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1) < 0)
217 		return;
218 
219 	if (force || (buf & mask) == mask) {
220 		buf = TPM_ACCESS_ACTIVE_LOCALITY;
221 		tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
222 	}
223 }
224 
tpm_tis_i2c_request_locality(struct udevice * dev,int loc)225 static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc)
226 {
227 	struct tpm_chip *chip = dev_get_priv(dev);
228 	unsigned long start, stop;
229 	u8 buf = TPM_ACCESS_REQUEST_USE;
230 	int rc;
231 
232 	rc = tpm_tis_i2c_check_locality(dev, loc);
233 	if (rc >= 0) {
234 		debug("%s: Already have locality\n", __func__);
235 		return loc;  /* We already have the locality */
236 	} else if (rc != -ENOENT) {
237 		debug("%s: Failed to get locality: %d\n", __func__, rc);
238 		return rc;
239 	}
240 
241 	rc = tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1);
242 	if (rc) {
243 		debug("%s: Failed to write to TPM: %d\n", __func__, rc);
244 		return rc;
245 	}
246 
247 	/* Wait for burstcount */
248 	start = get_timer(0);
249 	stop = chip->timeout_a;
250 	do {
251 		rc = tpm_tis_i2c_check_locality(dev, loc);
252 		if (rc >= 0) {
253 			debug("%s: Have locality\n", __func__);
254 			return loc;
255 		} else if (rc != -ENOENT) {
256 			debug("%s: Failed to get locality: %d\n", __func__, rc);
257 			return rc;
258 		}
259 		mdelay(TPM_TIMEOUT_MS);
260 	} while (get_timer(start) < stop);
261 	debug("%s: Timeout getting locality: %d\n", __func__, rc);
262 
263 	return rc;
264 }
265 
tpm_tis_i2c_status(struct udevice * dev)266 static u8 tpm_tis_i2c_status(struct udevice *dev)
267 {
268 	struct tpm_chip *chip = dev_get_priv(dev);
269 	/* NOTE: Since i2c read may fail, return 0 in this case --> time-out */
270 	u8 buf;
271 
272 	if (tpm_tis_i2c_read(dev, TPM_STS(chip->locality), &buf, 1) < 0)
273 		return 0;
274 	else
275 		return buf;
276 }
277 
tpm_tis_i2c_ready(struct udevice * dev)278 static int tpm_tis_i2c_ready(struct udevice *dev)
279 {
280 	struct tpm_chip *chip = dev_get_priv(dev);
281 	int rc;
282 
283 	/* This causes the current command to be aborted */
284 	u8 buf = TPM_STS_COMMAND_READY;
285 
286 	debug("%s\n", __func__);
287 	rc = tpm_tis_i2c_write_long(dev, TPM_STS(chip->locality), &buf, 1);
288 	if (rc)
289 		debug("%s: rc=%d\n", __func__, rc);
290 
291 	return rc;
292 }
293 
tpm_tis_i2c_get_burstcount(struct udevice * dev)294 static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev)
295 {
296 	struct tpm_chip *chip = dev_get_priv(dev);
297 	unsigned long start, stop;
298 	ssize_t burstcnt;
299 	u8 addr, buf[3];
300 
301 	/* Wait for burstcount */
302 	/* XXX: Which timeout value? Spec has 2 answers (c & d) */
303 	start = get_timer(0);
304 	stop = chip->timeout_d;
305 	do {
306 		/* Note: STS is little endian */
307 		addr = TPM_STS(chip->locality) + 1;
308 		if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0)
309 			burstcnt = 0;
310 		else
311 			burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
312 
313 		if (burstcnt)
314 			return burstcnt;
315 		mdelay(TPM_TIMEOUT_MS);
316 	} while (get_timer(start) < stop);
317 
318 	return -EBUSY;
319 }
320 
tpm_tis_i2c_wait_for_stat(struct udevice * dev,u8 mask,unsigned long timeout,int * status)321 static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask,
322 				     unsigned long timeout, int *status)
323 {
324 	unsigned long start, stop;
325 
326 	/* Check current status */
327 	*status = tpm_tis_i2c_status(dev);
328 	if ((*status & mask) == mask)
329 		return 0;
330 
331 	start = get_timer(0);
332 	stop = timeout;
333 	do {
334 		mdelay(TPM_TIMEOUT_MS);
335 		*status = tpm_tis_i2c_status(dev);
336 		if ((*status & mask) == mask)
337 			return 0;
338 	} while (get_timer(start) < stop);
339 
340 	return -ETIMEDOUT;
341 }
342 
tpm_tis_i2c_recv_data(struct udevice * dev,u8 * buf,size_t count)343 static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count)
344 {
345 	struct tpm_chip *chip = dev_get_priv(dev);
346 	size_t size = 0;
347 	ssize_t burstcnt;
348 	int rc;
349 
350 	while (size < count) {
351 		burstcnt = tpm_tis_i2c_get_burstcount(dev);
352 
353 		/* burstcount < 0 -> tpm is busy */
354 		if (burstcnt < 0)
355 			return burstcnt;
356 
357 		/* Limit received data to max left */
358 		if (burstcnt > (count - size))
359 			burstcnt = count - size;
360 
361 		rc = tpm_tis_i2c_read(dev, TPM_DATA_FIFO(chip->locality),
362 				      &(buf[size]), burstcnt);
363 		if (rc == 0)
364 			size += burstcnt;
365 	}
366 
367 	return size;
368 }
369 
tpm_tis_i2c_recv(struct udevice * dev,u8 * buf,size_t count)370 static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count)
371 {
372 	struct tpm_chip *chip = dev_get_priv(dev);
373 	int size = 0;
374 	int status;
375 	unsigned int expected;
376 	int rc;
377 
378 	status = tpm_tis_i2c_status(dev);
379 	if (status == TPM_STS_COMMAND_READY)
380 		return -EINTR;
381 	if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) !=
382 	    (TPM_STS_DATA_AVAIL | TPM_STS_VALID))
383 		return -EAGAIN;
384 
385 	debug("...got it;\n");
386 
387 	/* Read first 10 bytes, including tag, paramsize, and result */
388 	size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE);
389 	if (size < TPM_HEADER_SIZE) {
390 		debug("Unable to read header\n");
391 		return size < 0 ? size : -EIO;
392 	}
393 
394 	expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE);
395 	if ((size_t)expected > count || (size_t)expected < TPM_HEADER_SIZE) {
396 		debug("Error size=%x, expected=%x, count=%x\n", size, expected,
397 		      count);
398 		return -ENOSPC;
399 	}
400 
401 	size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE],
402 				      expected - TPM_HEADER_SIZE);
403 	if (size < expected) {
404 		debug("Unable to read remainder of result\n");
405 		return -ETIMEDOUT;
406 	}
407 
408 	rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c,
409 				       &status);
410 	if (rc)
411 		return rc;
412 	if (status & TPM_STS_DATA_AVAIL) {  /* Retry? */
413 		debug("Error left over data\n");
414 		return -EIO;
415 	}
416 
417 	return size;
418 }
419 
tpm_tis_i2c_send(struct udevice * dev,const u8 * buf,size_t len)420 static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len)
421 {
422 	struct tpm_chip *chip = dev_get_priv(dev);
423 	int rc, status;
424 	size_t burstcnt;
425 	size_t count = 0;
426 	int retry = 0;
427 	u8 sts = TPM_STS_GO;
428 
429 	debug("%s: len=%d\n", __func__, len);
430 	if (len > TPM_DEV_BUFSIZE)
431 		return -E2BIG;  /* Command is too long for our tpm, sorry */
432 
433 	if (tpm_tis_i2c_request_locality(dev, 0) < 0)
434 		return -EBUSY;
435 
436 	status = tpm_tis_i2c_status(dev);
437 	if ((status & TPM_STS_COMMAND_READY) == 0) {
438 		rc = tpm_tis_i2c_ready(dev);
439 		if (rc)
440 			return rc;
441 		rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY,
442 					       chip->timeout_b, &status);
443 		if (rc)
444 			return rc;
445 	}
446 
447 	burstcnt = tpm_tis_i2c_get_burstcount(dev);
448 
449 	/* burstcount < 0 -> tpm is busy */
450 	if (burstcnt < 0)
451 		return burstcnt;
452 
453 	while (count < len) {
454 		udelay(300);
455 		if (burstcnt > len - count)
456 			burstcnt = len - count;
457 
458 #ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION
459 		if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN)
460 			burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN;
461 #endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */
462 
463 		rc = tpm_tis_i2c_write(dev, TPM_DATA_FIFO(chip->locality),
464 				       &(buf[count]), burstcnt);
465 		if (rc == 0)
466 			count += burstcnt;
467 		else {
468 			debug("%s: error\n", __func__);
469 			if (retry++ > 10)
470 				return -EIO;
471 			rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID,
472 						       chip->timeout_c,
473 						       &status);
474 			if (rc)
475 				return rc;
476 
477 			if ((status & TPM_STS_DATA_EXPECT) == 0)
478 				return -EIO;
479 		}
480 	}
481 
482 	/* Go and do it */
483 	rc = tpm_tis_i2c_write(dev, TPM_STS(chip->locality), &sts, 1);
484 	if (rc < 0)
485 		return rc;
486 	debug("%s: done, rc=%d\n", __func__, rc);
487 
488 	return len;
489 }
490 
tpm_tis_i2c_cleanup(struct udevice * dev)491 static int tpm_tis_i2c_cleanup(struct udevice *dev)
492 {
493 	struct tpm_chip *chip = dev_get_priv(dev);
494 
495 	tpm_tis_i2c_ready(dev);
496 	/*
497 	 * The TPM needs some time to clean up here,
498 	 * so we sleep rather than keeping the bus busy
499 	 */
500 	mdelay(2);
501 	tpm_tis_i2c_release_locality(dev, chip->locality, 0);
502 
503 	return 0;
504 }
505 
tpm_tis_i2c_init(struct udevice * dev)506 static int tpm_tis_i2c_init(struct udevice *dev)
507 {
508 	struct tpm_chip *chip = dev_get_priv(dev);
509 	u32 vendor;
510 	u32 expected_did_vid;
511 	int rc;
512 
513 	chip->is_open = 1;
514 
515 	/* Default timeouts - these could move to the device tree */
516 	chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
517 	chip->timeout_b = TIS_LONG_TIMEOUT_MS;
518 	chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
519 	chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
520 
521 	rc = tpm_tis_i2c_request_locality(dev, 0);
522 	if (rc < 0)
523 		return rc;
524 
525 	/* Read four bytes from DID_VID register */
526 	if (tpm_tis_i2c_read(dev, TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) {
527 		tpm_tis_i2c_release_locality(dev, 0, 1);
528 		return -EIO;
529 	}
530 
531 	if (chip->chip_type == SLB9635) {
532 		vendor = be32_to_cpu(vendor);
533 		expected_did_vid = TPM_TIS_I2C_DID_VID_9635;
534 	} else {
535 		/* device id and byte order has changed for newer i2c tpms */
536 		expected_did_vid = TPM_TIS_I2C_DID_VID_9645;
537 	}
538 
539 	if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) {
540 		pr_err("Vendor id did not match! ID was %08x\n", vendor);
541 		return -ENODEV;
542 	}
543 
544 	chip->vend_dev = vendor;
545 	debug("1.2 TPM (chip type %s device-id 0x%X)\n",
546 	      chip_name[chip->chip_type], vendor >> 16);
547 
548 	/*
549 	 * A timeout query to TPM can be placed here.
550 	 * Standard timeout values are used so far
551 	 */
552 
553 	return 0;
554 }
555 
tpm_tis_i2c_open(struct udevice * dev)556 static int tpm_tis_i2c_open(struct udevice *dev)
557 {
558 	struct tpm_chip *chip = dev_get_priv(dev);
559 	int rc;
560 
561 	debug("%s: start\n", __func__);
562 	if (chip->is_open)
563 		return -EBUSY;
564 	rc = tpm_tis_i2c_init(dev);
565 	if (rc < 0)
566 		chip->is_open = 0;
567 
568 	return rc;
569 }
570 
tpm_tis_i2c_close(struct udevice * dev)571 static int tpm_tis_i2c_close(struct udevice *dev)
572 {
573 	struct tpm_chip *chip = dev_get_priv(dev);
574 
575 	if (chip->is_open) {
576 		tpm_tis_i2c_release_locality(dev, chip->locality, 1);
577 		chip->is_open = 0;
578 		chip->vend_dev = 0;
579 	}
580 
581 	return 0;
582 }
583 
tpm_tis_get_desc(struct udevice * dev,char * buf,int size)584 static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size)
585 {
586 	struct tpm_chip *chip = dev_get_priv(dev);
587 
588 	if (size < 50)
589 		return -ENOSPC;
590 
591 	return snprintf(buf, size, "1.2 TPM (%s, chip type %s device-id 0x%x)",
592 			chip->is_open ? "open" : "closed",
593 			chip_name[chip->chip_type],
594 			chip->vend_dev >> 16);
595 }
596 
tpm_tis_i2c_probe(struct udevice * dev)597 static int tpm_tis_i2c_probe(struct udevice *dev)
598 {
599 	struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev);
600 	struct tpm_chip *chip = dev_get_priv(dev);
601 
602 	chip->chip_type = dev_get_driver_data(dev);
603 
604 	/* TODO: These need to be checked and tuned */
605 	uc_priv->duration_ms[TPM_SHORT] = TIS_SHORT_TIMEOUT_MS;
606 	uc_priv->duration_ms[TPM_MEDIUM] = TIS_LONG_TIMEOUT_MS;
607 	uc_priv->duration_ms[TPM_LONG] = TIS_LONG_TIMEOUT_MS;
608 	uc_priv->retry_time_ms = TPM_TIMEOUT_MS;
609 
610 	return 0;
611 }
612 
613 static const struct tpm_ops tpm_tis_i2c_ops = {
614 	.open		= tpm_tis_i2c_open,
615 	.close		= tpm_tis_i2c_close,
616 	.get_desc	= tpm_tis_get_desc,
617 	.send		= tpm_tis_i2c_send,
618 	.recv		= tpm_tis_i2c_recv,
619 	.cleanup	= tpm_tis_i2c_cleanup,
620 };
621 
622 static const struct udevice_id tpm_tis_i2c_ids[] = {
623 	{ .compatible = "infineon,slb9635tt", .data = SLB9635 },
624 	{ .compatible = "infineon,slb9645tt", .data = SLB9645 },
625 	{ }
626 };
627 
628 U_BOOT_DRIVER(tpm_tis_i2c) = {
629 	.name   = "tpm_tis_infineon",
630 	.id     = UCLASS_TPM,
631 	.of_match = tpm_tis_i2c_ids,
632 	.ops    = &tpm_tis_i2c_ops,
633 	.probe	= tpm_tis_i2c_probe,
634 	.priv_auto_alloc_size = sizeof(struct tpm_chip),
635 };
636