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1 | /* | |
2 | * Copyright (C) 2011 Infineon Technologies | |
3 | * | |
4 | * Authors: | |
5 | * Peter Huewe <huewe.external@infineon.com> | |
6 | * | |
7 | * Description: | |
8 | * Device driver for TCG/TCPA TPM (trusted platform module). | |
9 | * Specifications at www.trustedcomputinggroup.org | |
10 | * | |
11 | * This device driver implements the TPM interface as defined in | |
12 | * the TCG TPM Interface Spec version 1.2, revision 1.0 and the | |
13 | * Infineon I2C Protocol Stack Specification v0.20. | |
14 | * | |
15 | * It is based on the Linux kernel driver tpm.c from Leendert van | |
16 | * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. | |
17 | * | |
18 | * Version: 2.1.1 | |
19 | * | |
20 | * SPDX-License-Identifier: GPL-2.0 | |
21 | */ | |
22 | ||
23 | #include <common.h> | |
24 | #include <dm.h> | |
25 | #include <fdtdec.h> | |
26 | #include <i2c.h> | |
27 | #include <tpm.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/compiler.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/unaligned/be_byteshift.h> | |
32 | ||
33 | #include "tpm_tis.h" | |
34 | #include "tpm_internal.h" | |
35 | ||
36 | DECLARE_GLOBAL_DATA_PTR; | |
37 | ||
38 | enum i2c_chip_type { | |
39 | SLB9635, | |
40 | SLB9645, | |
41 | UNKNOWN, | |
42 | }; | |
43 | ||
44 | /* expected value for DIDVID register */ | |
45 | #define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L | |
46 | #define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L | |
47 | ||
48 | static const char * const chip_name[] = { | |
49 | [SLB9635] = "slb9635tt", | |
50 | [SLB9645] = "slb9645tt", | |
51 | [UNKNOWN] = "unknown/fallback to slb9635", | |
52 | }; | |
53 | ||
54 | #define TPM_ACCESS(l) (0x0000 | ((l) << 4)) | |
55 | #define TPM_STS(l) (0x0001 | ((l) << 4)) | |
56 | #define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4)) | |
57 | #define TPM_DID_VID(l) (0x0006 | ((l) << 4)) | |
58 | ||
59 | /* | |
60 | * tpm_tis_i2c_read() - read from TPM register | |
61 | * @addr: register address to read from | |
62 | * @buffer: provided by caller | |
63 | * @len: number of bytes to read | |
64 | * | |
65 | * Read len bytes from TPM register and put them into | |
66 | * buffer (little-endian format, i.e. first byte is put into buffer[0]). | |
67 | * | |
68 | * NOTE: TPM is big-endian for multi-byte values. Multi-byte | |
69 | * values have to be swapped. | |
70 | * | |
71 | * Return -EIO on error, 0 on success. | |
72 | */ | |
73 | static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer, | |
74 | size_t len) | |
75 | { | |
76 | struct tpm_chip *chip = dev_get_priv(dev); | |
77 | int rc; | |
78 | int count; | |
79 | uint32_t addrbuf = addr; | |
80 | ||
81 | if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) { | |
82 | /* slb9635 protocol should work in both cases */ | |
83 | for (count = 0; count < MAX_COUNT; count++) { | |
84 | rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1); | |
85 | if (rc == 0) | |
86 | break; /* Success, break to skip sleep */ | |
87 | udelay(SLEEP_DURATION_US); | |
88 | } | |
89 | if (rc) | |
90 | return rc; | |
91 | ||
92 | /* After the TPM has successfully received the register address | |
93 | * it needs some time, thus we're sleeping here again, before | |
94 | * retrieving the data | |
95 | */ | |
96 | for (count = 0; count < MAX_COUNT; count++) { | |
97 | udelay(SLEEP_DURATION_US); | |
98 | rc = dm_i2c_read(dev, 0, buffer, len); | |
99 | if (rc == 0) | |
100 | break; /* success, break to skip sleep */ | |
101 | } | |
102 | } else { | |
103 | /* | |
104 | * Use a combined read for newer chips. | |
105 | * Unfortunately the smbus functions are not suitable due to | |
106 | * the 32 byte limit of the smbus. | |
107 | * Retries should usually not be needed, but are kept just to | |
108 | * be safe on the safe side. | |
109 | */ | |
110 | for (count = 0; count < MAX_COUNT; count++) { | |
111 | rc = dm_i2c_read(dev, addr, buffer, len); | |
112 | if (rc == 0) | |
113 | break; /* break here to skip sleep */ | |
114 | udelay(SLEEP_DURATION_US); | |
115 | } | |
116 | } | |
117 | ||
118 | /* Take care of 'guard time' */ | |
119 | udelay(SLEEP_DURATION_US); | |
120 | if (rc) | |
121 | return rc; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr, | |
127 | const u8 *buffer, size_t len, | |
128 | unsigned int sleep_time_us, u8 max_count) | |
129 | { | |
130 | struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); | |
131 | struct tpm_chip *chip = dev_get_priv(dev); | |
132 | int rc = 0; | |
133 | int count; | |
134 | ||
135 | if (chip->chip_type == SLB9635) { | |
136 | /* Prepare send buffer to include the address */ | |
137 | priv->buf[0] = addr; | |
138 | memcpy(&(priv->buf[1]), buffer, len); | |
139 | buffer = priv->buf; | |
140 | len++; | |
141 | addr = 0; | |
142 | } | |
143 | ||
144 | for (count = 0; count < max_count; count++) { | |
145 | rc = dm_i2c_write(dev, addr, buffer, len); | |
146 | if (rc == 0) | |
147 | break; /* Success, break to skip sleep */ | |
148 | udelay(sleep_time_us); | |
149 | } | |
150 | ||
151 | /* take care of 'guard time' */ | |
152 | udelay(sleep_time_us); | |
153 | if (rc) | |
154 | return rc; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | /* | |
160 | * tpm_tis_i2c_write() - write to TPM register | |
161 | * @addr: register address to write to | |
162 | * @buffer: containing data to be written | |
163 | * @len: number of bytes to write | |
164 | * | |
165 | * Write len bytes from provided buffer to TPM register (little | |
166 | * endian format, i.e. buffer[0] is written as first byte). | |
167 | * | |
168 | * NOTE: TPM is big-endian for multi-byte values. Multi-byte | |
169 | * values have to be swapped. | |
170 | * | |
171 | * NOTE: use this function instead of the tpm_tis_i2c_write_generic function. | |
172 | * | |
173 | * Return -EIO on error, 0 on success | |
174 | */ | |
175 | static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer, | |
176 | size_t len) | |
177 | { | |
178 | return tpm_tis_i2c_write_generic(dev, addr, buffer, len, | |
179 | SLEEP_DURATION_US, MAX_COUNT); | |
180 | } | |
181 | ||
182 | /* | |
183 | * This function is needed especially for the cleanup situation after | |
184 | * sending TPM_READY | |
185 | */ | |
186 | static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer, | |
187 | size_t len) | |
188 | { | |
189 | return tpm_tis_i2c_write_generic(dev, addr, buffer, len, | |
190 | SLEEP_DURATION_LONG_US, | |
191 | MAX_COUNT_LONG); | |
192 | } | |
193 | ||
194 | static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc) | |
195 | { | |
196 | const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID; | |
197 | struct tpm_chip *chip = dev_get_priv(dev); | |
198 | u8 buf; | |
199 | int rc; | |
200 | ||
201 | rc = tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1); | |
202 | if (rc < 0) | |
203 | return rc; | |
204 | ||
205 | if ((buf & mask) == mask) { | |
206 | chip->locality = loc; | |
207 | return loc; | |
208 | } | |
209 | ||
210 | return -ENOENT; | |
211 | } | |
212 | ||
213 | static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc, | |
214 | int force) | |
215 | { | |
216 | const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID; | |
217 | u8 buf; | |
218 | ||
219 | if (tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1) < 0) | |
220 | return; | |
221 | ||
222 | if (force || (buf & mask) == mask) { | |
223 | buf = TPM_ACCESS_ACTIVE_LOCALITY; | |
224 | tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1); | |
225 | } | |
226 | } | |
227 | ||
228 | static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc) | |
229 | { | |
230 | struct tpm_chip *chip = dev_get_priv(dev); | |
231 | unsigned long start, stop; | |
232 | u8 buf = TPM_ACCESS_REQUEST_USE; | |
233 | int rc; | |
234 | ||
235 | rc = tpm_tis_i2c_check_locality(dev, loc); | |
236 | if (rc >= 0) { | |
237 | debug("%s: Already have locality\n", __func__); | |
238 | return loc; /* We already have the locality */ | |
239 | } else if (rc != -ENOENT) { | |
240 | debug("%s: Failed to get locality: %d\n", __func__, rc); | |
241 | return rc; | |
242 | } | |
243 | ||
244 | rc = tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1); | |
245 | if (rc) { | |
246 | debug("%s: Failed to write to TPM: %d\n", __func__, rc); | |
247 | return rc; | |
248 | } | |
249 | ||
250 | /* Wait for burstcount */ | |
251 | start = get_timer(0); | |
252 | stop = chip->timeout_a; | |
253 | do { | |
254 | rc = tpm_tis_i2c_check_locality(dev, loc); | |
255 | if (rc >= 0) { | |
256 | debug("%s: Have locality\n", __func__); | |
257 | return loc; | |
258 | } else if (rc != -ENOENT) { | |
259 | debug("%s: Failed to get locality: %d\n", __func__, rc); | |
260 | return rc; | |
261 | } | |
262 | mdelay(TPM_TIMEOUT_MS); | |
263 | } while (get_timer(start) < stop); | |
264 | debug("%s: Timeout getting locality: %d\n", __func__, rc); | |
265 | ||
266 | return rc; | |
267 | } | |
268 | ||
269 | static u8 tpm_tis_i2c_status(struct udevice *dev) | |
270 | { | |
271 | struct tpm_chip *chip = dev_get_priv(dev); | |
272 | /* NOTE: Since i2c read may fail, return 0 in this case --> time-out */ | |
273 | u8 buf; | |
274 | ||
275 | if (tpm_tis_i2c_read(dev, TPM_STS(chip->locality), &buf, 1) < 0) | |
276 | return 0; | |
277 | else | |
278 | return buf; | |
279 | } | |
280 | ||
281 | static int tpm_tis_i2c_ready(struct udevice *dev) | |
282 | { | |
283 | struct tpm_chip *chip = dev_get_priv(dev); | |
284 | int rc; | |
285 | ||
286 | /* This causes the current command to be aborted */ | |
287 | u8 buf = TPM_STS_COMMAND_READY; | |
288 | ||
289 | debug("%s\n", __func__); | |
290 | rc = tpm_tis_i2c_write_long(dev, TPM_STS(chip->locality), &buf, 1); | |
291 | if (rc) | |
292 | debug("%s: rc=%d\n", __func__, rc); | |
293 | ||
294 | return rc; | |
295 | } | |
296 | ||
297 | static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev) | |
298 | { | |
299 | struct tpm_chip *chip = dev_get_priv(dev); | |
300 | unsigned long start, stop; | |
301 | ssize_t burstcnt; | |
302 | u8 addr, buf[3]; | |
303 | ||
304 | /* Wait for burstcount */ | |
305 | /* XXX: Which timeout value? Spec has 2 answers (c & d) */ | |
306 | start = get_timer(0); | |
307 | stop = chip->timeout_d; | |
308 | do { | |
309 | /* Note: STS is little endian */ | |
310 | addr = TPM_STS(chip->locality) + 1; | |
311 | if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0) | |
312 | burstcnt = 0; | |
313 | else | |
314 | burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0]; | |
315 | ||
316 | if (burstcnt) | |
317 | return burstcnt; | |
318 | mdelay(TPM_TIMEOUT_MS); | |
319 | } while (get_timer(start) < stop); | |
320 | ||
321 | return -EBUSY; | |
322 | } | |
323 | ||
324 | static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask, | |
325 | unsigned long timeout, int *status) | |
326 | { | |
327 | unsigned long start, stop; | |
328 | ||
329 | /* Check current status */ | |
330 | *status = tpm_tis_i2c_status(dev); | |
331 | if ((*status & mask) == mask) | |
332 | return 0; | |
333 | ||
334 | start = get_timer(0); | |
335 | stop = timeout; | |
336 | do { | |
337 | mdelay(TPM_TIMEOUT_MS); | |
338 | *status = tpm_tis_i2c_status(dev); | |
339 | if ((*status & mask) == mask) | |
340 | return 0; | |
341 | } while (get_timer(start) < stop); | |
342 | ||
343 | return -ETIMEDOUT; | |
344 | } | |
345 | ||
346 | static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count) | |
347 | { | |
348 | struct tpm_chip *chip = dev_get_priv(dev); | |
349 | size_t size = 0; | |
350 | ssize_t burstcnt; | |
351 | int rc; | |
352 | ||
353 | while (size < count) { | |
354 | burstcnt = tpm_tis_i2c_get_burstcount(dev); | |
355 | ||
356 | /* burstcount < 0 -> tpm is busy */ | |
357 | if (burstcnt < 0) | |
358 | return burstcnt; | |
359 | ||
360 | /* Limit received data to max left */ | |
361 | if (burstcnt > (count - size)) | |
362 | burstcnt = count - size; | |
363 | ||
364 | rc = tpm_tis_i2c_read(dev, TPM_DATA_FIFO(chip->locality), | |
365 | &(buf[size]), burstcnt); | |
366 | if (rc == 0) | |
367 | size += burstcnt; | |
368 | } | |
369 | ||
370 | return size; | |
371 | } | |
372 | ||
373 | static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count) | |
374 | { | |
375 | struct tpm_chip *chip = dev_get_priv(dev); | |
376 | int size = 0; | |
377 | int expected, status; | |
378 | int rc; | |
379 | ||
380 | status = tpm_tis_i2c_status(dev); | |
381 | if (status == TPM_STS_COMMAND_READY) | |
382 | return -EINTR; | |
383 | if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) != | |
384 | (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) | |
385 | return -EAGAIN; | |
386 | ||
387 | debug("...got it;\n"); | |
388 | ||
389 | /* Read first 10 bytes, including tag, paramsize, and result */ | |
390 | size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE); | |
391 | if (size < TPM_HEADER_SIZE) { | |
392 | debug("Unable to read header\n"); | |
393 | return size < 0 ? size : -EIO; | |
394 | } | |
395 | ||
396 | expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE); | |
397 | if ((size_t)expected > count) { | |
398 | debug("Error size=%x, expected=%x, count=%x\n", size, expected, | |
399 | count); | |
400 | return -ENOSPC; | |
401 | } | |
402 | ||
403 | size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE], | |
404 | expected - TPM_HEADER_SIZE); | |
405 | if (size < expected) { | |
406 | debug("Unable to read remainder of result\n"); | |
407 | return -ETIMEDOUT; | |
408 | } | |
409 | ||
410 | rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c, | |
411 | &status); | |
412 | if (rc) | |
413 | return rc; | |
414 | if (status & TPM_STS_DATA_AVAIL) { /* Retry? */ | |
415 | debug("Error left over data\n"); | |
416 | return -EIO; | |
417 | } | |
418 | ||
419 | return size; | |
420 | } | |
421 | ||
422 | static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len) | |
423 | { | |
424 | struct tpm_chip *chip = dev_get_priv(dev); | |
425 | int rc, status; | |
426 | size_t burstcnt; | |
427 | size_t count = 0; | |
428 | int retry = 0; | |
429 | u8 sts = TPM_STS_GO; | |
430 | ||
431 | debug("%s: len=%d\n", __func__, len); | |
432 | if (len > TPM_DEV_BUFSIZE) | |
433 | return -E2BIG; /* Command is too long for our tpm, sorry */ | |
434 | ||
435 | if (tpm_tis_i2c_request_locality(dev, 0) < 0) | |
436 | return -EBUSY; | |
437 | ||
438 | status = tpm_tis_i2c_status(dev); | |
439 | if ((status & TPM_STS_COMMAND_READY) == 0) { | |
440 | rc = tpm_tis_i2c_ready(dev); | |
441 | if (rc) | |
442 | return rc; | |
443 | rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_COMMAND_READY, | |
444 | chip->timeout_b, &status); | |
445 | if (rc) | |
446 | return rc; | |
447 | } | |
448 | ||
449 | burstcnt = tpm_tis_i2c_get_burstcount(dev); | |
450 | ||
451 | /* burstcount < 0 -> tpm is busy */ | |
452 | if (burstcnt < 0) | |
453 | return burstcnt; | |
454 | ||
455 | while (count < len) { | |
456 | udelay(300); | |
457 | if (burstcnt > len - count) | |
458 | burstcnt = len - count; | |
459 | ||
460 | #ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION | |
461 | if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN) | |
462 | burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN; | |
463 | #endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */ | |
464 | ||
465 | rc = tpm_tis_i2c_write(dev, TPM_DATA_FIFO(chip->locality), | |
466 | &(buf[count]), burstcnt); | |
467 | if (rc == 0) | |
468 | count += burstcnt; | |
469 | else { | |
470 | debug("%s: error\n", __func__); | |
471 | if (retry++ > 10) | |
472 | return -EIO; | |
473 | rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, | |
474 | chip->timeout_c, | |
475 | &status); | |
476 | if (rc) | |
477 | return rc; | |
478 | ||
479 | if ((status & TPM_STS_DATA_EXPECT) == 0) | |
480 | return -EIO; | |
481 | } | |
482 | } | |
483 | ||
484 | /* Go and do it */ | |
485 | rc = tpm_tis_i2c_write(dev, TPM_STS(chip->locality), &sts, 1); | |
486 | if (rc < 0) | |
487 | return rc; | |
488 | debug("%s: done, rc=%d\n", __func__, rc); | |
489 | ||
490 | return len; | |
491 | } | |
492 | ||
493 | static int tpm_tis_i2c_cleanup(struct udevice *dev) | |
494 | { | |
495 | struct tpm_chip *chip = dev_get_priv(dev); | |
496 | ||
497 | tpm_tis_i2c_ready(dev); | |
498 | /* | |
499 | * The TPM needs some time to clean up here, | |
500 | * so we sleep rather than keeping the bus busy | |
501 | */ | |
502 | mdelay(2); | |
503 | tpm_tis_i2c_release_locality(dev, chip->locality, 0); | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | static int tpm_tis_i2c_init(struct udevice *dev) | |
509 | { | |
510 | struct tpm_chip *chip = dev_get_priv(dev); | |
511 | u32 vendor; | |
512 | u32 expected_did_vid; | |
513 | int rc; | |
514 | ||
515 | chip->is_open = 1; | |
516 | ||
517 | /* Default timeouts - these could move to the device tree */ | |
518 | chip->timeout_a = TIS_SHORT_TIMEOUT_MS; | |
519 | chip->timeout_b = TIS_LONG_TIMEOUT_MS; | |
520 | chip->timeout_c = TIS_SHORT_TIMEOUT_MS; | |
521 | chip->timeout_d = TIS_SHORT_TIMEOUT_MS; | |
522 | ||
523 | rc = tpm_tis_i2c_request_locality(dev, 0); | |
524 | if (rc < 0) | |
525 | return rc; | |
526 | ||
527 | /* Read four bytes from DID_VID register */ | |
528 | if (tpm_tis_i2c_read(dev, TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) { | |
529 | tpm_tis_i2c_release_locality(dev, 0, 1); | |
530 | return -EIO; | |
531 | } | |
532 | ||
533 | if (chip->chip_type == SLB9635) { | |
534 | vendor = be32_to_cpu(vendor); | |
535 | expected_did_vid = TPM_TIS_I2C_DID_VID_9635; | |
536 | } else { | |
537 | /* device id and byte order has changed for newer i2c tpms */ | |
538 | expected_did_vid = TPM_TIS_I2C_DID_VID_9645; | |
539 | } | |
540 | ||
541 | if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) { | |
542 | pr_err("Vendor id did not match! ID was %08x\n", vendor); | |
543 | return -ENODEV; | |
544 | } | |
545 | ||
546 | chip->vend_dev = vendor; | |
547 | debug("1.2 TPM (chip type %s device-id 0x%X)\n", | |
548 | chip_name[chip->chip_type], vendor >> 16); | |
549 | ||
550 | /* | |
551 | * A timeout query to TPM can be placed here. | |
552 | * Standard timeout values are used so far | |
553 | */ | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int tpm_tis_i2c_open(struct udevice *dev) | |
559 | { | |
560 | struct tpm_chip *chip = dev_get_priv(dev); | |
561 | int rc; | |
562 | ||
563 | debug("%s: start\n", __func__); | |
564 | if (chip->is_open) | |
565 | return -EBUSY; | |
566 | rc = tpm_tis_i2c_init(dev); | |
567 | if (rc < 0) | |
568 | chip->is_open = 0; | |
569 | ||
570 | return rc; | |
571 | } | |
572 | ||
573 | static int tpm_tis_i2c_close(struct udevice *dev) | |
574 | { | |
575 | struct tpm_chip *chip = dev_get_priv(dev); | |
576 | ||
577 | if (chip->is_open) { | |
578 | tpm_tis_i2c_release_locality(dev, chip->locality, 1); | |
579 | chip->is_open = 0; | |
580 | chip->vend_dev = 0; | |
581 | } | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size) | |
587 | { | |
588 | struct tpm_chip *chip = dev_get_priv(dev); | |
589 | ||
590 | if (size < 50) | |
591 | return -ENOSPC; | |
592 | ||
593 | return snprintf(buf, size, "1.2 TPM (%s, chip type %s device-id 0x%x)", | |
594 | chip->is_open ? "open" : "closed", | |
595 | chip_name[chip->chip_type], | |
596 | chip->vend_dev >> 16); | |
597 | } | |
598 | ||
599 | static int tpm_tis_i2c_probe(struct udevice *dev) | |
600 | { | |
601 | struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev); | |
602 | struct tpm_chip *chip = dev_get_priv(dev); | |
603 | ||
604 | chip->chip_type = dev_get_driver_data(dev); | |
605 | ||
606 | /* TODO: These need to be checked and tuned */ | |
607 | uc_priv->duration_ms[TPM_SHORT] = TIS_SHORT_TIMEOUT_MS; | |
608 | uc_priv->duration_ms[TPM_MEDIUM] = TIS_LONG_TIMEOUT_MS; | |
609 | uc_priv->duration_ms[TPM_LONG] = TIS_LONG_TIMEOUT_MS; | |
610 | uc_priv->retry_time_ms = TPM_TIMEOUT_MS; | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | static const struct tpm_ops tpm_tis_i2c_ops = { | |
616 | .open = tpm_tis_i2c_open, | |
617 | .close = tpm_tis_i2c_close, | |
618 | .get_desc = tpm_tis_get_desc, | |
619 | .send = tpm_tis_i2c_send, | |
620 | .recv = tpm_tis_i2c_recv, | |
621 | .cleanup = tpm_tis_i2c_cleanup, | |
622 | }; | |
623 | ||
624 | static const struct udevice_id tpm_tis_i2c_ids[] = { | |
625 | { .compatible = "infineon,slb9635tt", .data = SLB9635 }, | |
626 | { .compatible = "infineon,slb9645tt", .data = SLB9645 }, | |
627 | { } | |
628 | }; | |
629 | ||
630 | U_BOOT_DRIVER(tpm_tis_i2c) = { | |
631 | .name = "tpm_tis_infineon", | |
632 | .id = UCLASS_TPM, | |
633 | .of_match = tpm_tis_i2c_ids, | |
634 | .ops = &tpm_tis_i2c_ops, | |
635 | .probe = tpm_tis_i2c_probe, | |
636 | .priv_auto_alloc_size = sizeof(struct tpm_chip), | |
637 | }; |