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f6267998 RC |
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 | * | |
07470d6f | 20 | * SPDX-License-Identifier: GPL-2.0 |
f6267998 RC |
21 | */ |
22 | ||
23 | #include <common.h> | |
f90acf1a | 24 | #include <dm.h> |
ec34fa5e | 25 | #include <fdtdec.h> |
f6267998 | 26 | #include <i2c.h> |
1b393db5 | 27 | #include <tpm.h> |
5d97dff0 | 28 | #include <linux/errno.h> |
b697e0ff | 29 | #include <linux/compiler.h> |
f6267998 | 30 | #include <linux/types.h> |
1b393db5 | 31 | #include <linux/unaligned/be_byteshift.h> |
f6267998 | 32 | |
1259dcd7 | 33 | #include "tpm_tis.h" |
f255d31f | 34 | #include "tpm_internal.h" |
f6267998 | 35 | |
ec34fa5e VP |
36 | DECLARE_GLOBAL_DATA_PTR; |
37 | ||
1259dcd7 CR |
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 | ||
ec34fa5e VP |
48 | static const char * const chip_name[] = { |
49 | [SLB9635] = "slb9635tt", | |
50 | [SLB9645] = "slb9645tt", | |
51 | [UNKNOWN] = "unknown/fallback to slb9635", | |
52 | }; | |
f6267998 | 53 | |
1259dcd7 CR |
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 | ||
f6267998 | 59 | /* |
e56e20eb | 60 | * tpm_tis_i2c_read() - read from TPM register |
f6267998 RC |
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 | */ | |
b697e0ff SG |
73 | static int tpm_tis_i2c_read(struct udevice *dev, u8 addr, u8 *buffer, |
74 | size_t len) | |
f6267998 | 75 | { |
b697e0ff | 76 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 RC |
77 | int rc; |
78 | int count; | |
1b393db5 | 79 | uint32_t addrbuf = addr; |
f6267998 | 80 | |
b697e0ff | 81 | if ((chip->chip_type == SLB9635) || (chip->chip_type == UNKNOWN)) { |
ec34fa5e VP |
82 | /* slb9635 protocol should work in both cases */ |
83 | for (count = 0; count < MAX_COUNT; count++) { | |
b697e0ff | 84 | rc = dm_i2c_write(dev, 0, (uchar *)&addrbuf, 1); |
ec34fa5e | 85 | if (rc == 0) |
1b393db5 | 86 | break; /* Success, break to skip sleep */ |
42c8ec56 | 87 | udelay(SLEEP_DURATION_US); |
ec34fa5e | 88 | } |
ec34fa5e | 89 | if (rc) |
b697e0ff | 90 | return rc; |
ec34fa5e VP |
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++) { | |
42c8ec56 | 97 | udelay(SLEEP_DURATION_US); |
b697e0ff | 98 | rc = dm_i2c_read(dev, 0, buffer, len); |
ec34fa5e VP |
99 | if (rc == 0) |
100 | break; /* success, break to skip sleep */ | |
101 | } | |
102 | } else { | |
1b393db5 TWHT |
103 | /* |
104 | * Use a combined read for newer chips. | |
105 | * Unfortunately the smbus functions are not suitable due to | |
ec34fa5e | 106 | * the 32 byte limit of the smbus. |
1b393db5 | 107 | * Retries should usually not be needed, but are kept just to |
ec34fa5e VP |
108 | * be safe on the safe side. |
109 | */ | |
110 | for (count = 0; count < MAX_COUNT; count++) { | |
b697e0ff | 111 | rc = dm_i2c_read(dev, addr, buffer, len); |
ec34fa5e VP |
112 | if (rc == 0) |
113 | break; /* break here to skip sleep */ | |
42c8ec56 | 114 | udelay(SLEEP_DURATION_US); |
ec34fa5e | 115 | } |
f6267998 RC |
116 | } |
117 | ||
1b393db5 | 118 | /* Take care of 'guard time' */ |
42c8ec56 | 119 | udelay(SLEEP_DURATION_US); |
f6267998 | 120 | if (rc) |
b697e0ff | 121 | return rc; |
f6267998 RC |
122 | |
123 | return 0; | |
124 | } | |
125 | ||
b697e0ff SG |
126 | static int tpm_tis_i2c_write_generic(struct udevice *dev, u8 addr, |
127 | const u8 *buffer, size_t len, | |
42c8ec56 | 128 | unsigned int sleep_time_us, u8 max_count) |
f6267998 | 129 | { |
b697e0ff SG |
130 | struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); |
131 | struct tpm_chip *chip = dev_get_priv(dev); | |
f6267998 RC |
132 | int rc = 0; |
133 | int count; | |
134 | ||
b697e0ff SG |
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 | ||
f6267998 | 144 | for (count = 0; count < max_count; count++) { |
b697e0ff | 145 | rc = dm_i2c_write(dev, addr, buffer, len); |
f6267998 | 146 | if (rc == 0) |
1b393db5 | 147 | break; /* Success, break to skip sleep */ |
42c8ec56 | 148 | udelay(sleep_time_us); |
f6267998 RC |
149 | } |
150 | ||
ec34fa5e | 151 | /* take care of 'guard time' */ |
42c8ec56 | 152 | udelay(sleep_time_us); |
f6267998 | 153 | if (rc) |
b697e0ff | 154 | return rc; |
f6267998 RC |
155 | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /* | |
e56e20eb | 160 | * tpm_tis_i2c_write() - write to TPM register |
f6267998 RC |
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 | * | |
e56e20eb | 171 | * NOTE: use this function instead of the tpm_tis_i2c_write_generic function. |
f6267998 RC |
172 | * |
173 | * Return -EIO on error, 0 on success | |
174 | */ | |
b697e0ff SG |
175 | static int tpm_tis_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer, |
176 | size_t len) | |
f6267998 | 177 | { |
b697e0ff SG |
178 | return tpm_tis_i2c_write_generic(dev, addr, buffer, len, |
179 | SLEEP_DURATION_US, MAX_COUNT); | |
f6267998 RC |
180 | } |
181 | ||
182 | /* | |
183 | * This function is needed especially for the cleanup situation after | |
184 | * sending TPM_READY | |
1b393db5 | 185 | */ |
b697e0ff SG |
186 | static int tpm_tis_i2c_write_long(struct udevice *dev, u8 addr, u8 *buffer, |
187 | size_t len) | |
f6267998 | 188 | { |
b697e0ff | 189 | return tpm_tis_i2c_write_generic(dev, addr, buffer, len, |
42c8ec56 SG |
190 | SLEEP_DURATION_LONG_US, |
191 | MAX_COUNT_LONG); | |
f6267998 RC |
192 | } |
193 | ||
b697e0ff | 194 | static int tpm_tis_i2c_check_locality(struct udevice *dev, int loc) |
f6267998 | 195 | { |
1b393db5 | 196 | const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID; |
b697e0ff | 197 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 RC |
198 | u8 buf; |
199 | int rc; | |
200 | ||
b697e0ff | 201 | rc = tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1); |
f6267998 RC |
202 | if (rc < 0) |
203 | return rc; | |
204 | ||
1b393db5 | 205 | if ((buf & mask) == mask) { |
7c73537e | 206 | chip->locality = loc; |
f6267998 RC |
207 | return loc; |
208 | } | |
209 | ||
b697e0ff | 210 | return -ENOENT; |
f6267998 RC |
211 | } |
212 | ||
b697e0ff | 213 | static void tpm_tis_i2c_release_locality(struct udevice *dev, int loc, |
e56e20eb | 214 | int force) |
f6267998 | 215 | { |
1b393db5 | 216 | const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID; |
f6267998 | 217 | u8 buf; |
1b393db5 | 218 | |
b697e0ff | 219 | if (tpm_tis_i2c_read(dev, TPM_ACCESS(loc), &buf, 1) < 0) |
f6267998 RC |
220 | return; |
221 | ||
1b393db5 | 222 | if (force || (buf & mask) == mask) { |
f6267998 | 223 | buf = TPM_ACCESS_ACTIVE_LOCALITY; |
b697e0ff | 224 | tpm_tis_i2c_write(dev, TPM_ACCESS(loc), &buf, 1); |
f6267998 RC |
225 | } |
226 | } | |
227 | ||
b697e0ff | 228 | static int tpm_tis_i2c_request_locality(struct udevice *dev, int loc) |
f6267998 | 229 | { |
b697e0ff | 230 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 RC |
231 | unsigned long start, stop; |
232 | u8 buf = TPM_ACCESS_REQUEST_USE; | |
f90acf1a | 233 | int rc; |
f6267998 | 234 | |
b697e0ff SG |
235 | rc = tpm_tis_i2c_check_locality(dev, loc); |
236 | if (rc >= 0) { | |
237 | debug("%s: Already have locality\n", __func__); | |
1b393db5 | 238 | return loc; /* We already have the locality */ |
b697e0ff SG |
239 | } else if (rc != -ENOENT) { |
240 | debug("%s: Failed to get locality: %d\n", __func__, rc); | |
241 | return rc; | |
242 | } | |
f6267998 | 243 | |
b697e0ff SG |
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); | |
f90acf1a | 247 | return rc; |
b697e0ff | 248 | } |
f6267998 | 249 | |
1b393db5 | 250 | /* Wait for burstcount */ |
f6267998 | 251 | start = get_timer(0); |
7c73537e | 252 | stop = chip->timeout_a; |
f6267998 | 253 | do { |
b697e0ff SG |
254 | rc = tpm_tis_i2c_check_locality(dev, loc); |
255 | if (rc >= 0) { | |
256 | debug("%s: Have locality\n", __func__); | |
f6267998 | 257 | return loc; |
b697e0ff SG |
258 | } else if (rc != -ENOENT) { |
259 | debug("%s: Failed to get locality: %d\n", __func__, rc); | |
260 | return rc; | |
261 | } | |
42c8ec56 | 262 | mdelay(TPM_TIMEOUT_MS); |
f6267998 | 263 | } while (get_timer(start) < stop); |
b697e0ff | 264 | debug("%s: Timeout getting locality: %d\n", __func__, rc); |
f6267998 | 265 | |
b697e0ff | 266 | return rc; |
f6267998 RC |
267 | } |
268 | ||
b697e0ff | 269 | static u8 tpm_tis_i2c_status(struct udevice *dev) |
f6267998 | 270 | { |
b697e0ff | 271 | struct tpm_chip *chip = dev_get_priv(dev); |
1b393db5 | 272 | /* NOTE: Since i2c read may fail, return 0 in this case --> time-out */ |
f6267998 | 273 | u8 buf; |
1b393db5 | 274 | |
b697e0ff | 275 | if (tpm_tis_i2c_read(dev, TPM_STS(chip->locality), &buf, 1) < 0) |
f6267998 RC |
276 | return 0; |
277 | else | |
278 | return buf; | |
279 | } | |
280 | ||
b697e0ff | 281 | static int tpm_tis_i2c_ready(struct udevice *dev) |
f6267998 | 282 | { |
b697e0ff | 283 | struct tpm_chip *chip = dev_get_priv(dev); |
f90acf1a SG |
284 | int rc; |
285 | ||
1b393db5 | 286 | /* This causes the current command to be aborted */ |
f6267998 | 287 | u8 buf = TPM_STS_COMMAND_READY; |
1b393db5 | 288 | |
f90acf1a | 289 | debug("%s\n", __func__); |
b697e0ff | 290 | rc = tpm_tis_i2c_write_long(dev, TPM_STS(chip->locality), &buf, 1); |
f90acf1a SG |
291 | if (rc) |
292 | debug("%s: rc=%d\n", __func__, rc); | |
b697e0ff SG |
293 | |
294 | return rc; | |
f6267998 RC |
295 | } |
296 | ||
b697e0ff | 297 | static ssize_t tpm_tis_i2c_get_burstcount(struct udevice *dev) |
f6267998 | 298 | { |
b697e0ff | 299 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 RC |
300 | unsigned long start, stop; |
301 | ssize_t burstcnt; | |
1b393db5 | 302 | u8 addr, buf[3]; |
f6267998 | 303 | |
1b393db5 TWHT |
304 | /* Wait for burstcount */ |
305 | /* XXX: Which timeout value? Spec has 2 answers (c & d) */ | |
f6267998 | 306 | start = get_timer(0); |
7c73537e | 307 | stop = chip->timeout_d; |
f6267998 RC |
308 | do { |
309 | /* Note: STS is little endian */ | |
7c73537e | 310 | addr = TPM_STS(chip->locality) + 1; |
b697e0ff | 311 | if (tpm_tis_i2c_read(dev, addr, buf, 3) < 0) |
f6267998 RC |
312 | burstcnt = 0; |
313 | else | |
314 | burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0]; | |
315 | ||
316 | if (burstcnt) | |
317 | return burstcnt; | |
42c8ec56 | 318 | mdelay(TPM_TIMEOUT_MS); |
f6267998 RC |
319 | } while (get_timer(start) < stop); |
320 | ||
321 | return -EBUSY; | |
322 | } | |
323 | ||
b697e0ff | 324 | static int tpm_tis_i2c_wait_for_stat(struct udevice *dev, u8 mask, |
e56e20eb | 325 | unsigned long timeout, int *status) |
f6267998 RC |
326 | { |
327 | unsigned long start, stop; | |
328 | ||
1b393db5 | 329 | /* Check current status */ |
b697e0ff | 330 | *status = tpm_tis_i2c_status(dev); |
f6267998 RC |
331 | if ((*status & mask) == mask) |
332 | return 0; | |
333 | ||
334 | start = get_timer(0); | |
335 | stop = timeout; | |
336 | do { | |
42c8ec56 | 337 | mdelay(TPM_TIMEOUT_MS); |
b697e0ff | 338 | *status = tpm_tis_i2c_status(dev); |
f6267998 RC |
339 | if ((*status & mask) == mask) |
340 | return 0; | |
f6267998 RC |
341 | } while (get_timer(start) < stop); |
342 | ||
b697e0ff | 343 | return -ETIMEDOUT; |
f6267998 RC |
344 | } |
345 | ||
b697e0ff | 346 | static int tpm_tis_i2c_recv_data(struct udevice *dev, u8 *buf, size_t count) |
f6267998 | 347 | { |
b697e0ff | 348 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 RC |
349 | size_t size = 0; |
350 | ssize_t burstcnt; | |
351 | int rc; | |
352 | ||
353 | while (size < count) { | |
b697e0ff | 354 | burstcnt = tpm_tis_i2c_get_burstcount(dev); |
f6267998 | 355 | |
1b393db5 | 356 | /* burstcount < 0 -> tpm is busy */ |
f6267998 RC |
357 | if (burstcnt < 0) |
358 | return burstcnt; | |
359 | ||
1b393db5 | 360 | /* Limit received data to max left */ |
f6267998 RC |
361 | if (burstcnt > (count - size)) |
362 | burstcnt = count - size; | |
363 | ||
b697e0ff SG |
364 | rc = tpm_tis_i2c_read(dev, TPM_DATA_FIFO(chip->locality), |
365 | &(buf[size]), burstcnt); | |
f6267998 RC |
366 | if (rc == 0) |
367 | size += burstcnt; | |
368 | } | |
369 | ||
370 | return size; | |
371 | } | |
372 | ||
b697e0ff | 373 | static int tpm_tis_i2c_recv(struct udevice *dev, u8 *buf, size_t count) |
f6267998 | 374 | { |
b697e0ff | 375 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 RC |
376 | int size = 0; |
377 | int expected, status; | |
b697e0ff | 378 | int rc; |
f6267998 | 379 | |
b697e0ff SG |
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"); | |
f6267998 | 388 | |
1b393db5 | 389 | /* Read first 10 bytes, including tag, paramsize, and result */ |
b697e0ff | 390 | size = tpm_tis_i2c_recv_data(dev, buf, TPM_HEADER_SIZE); |
f6267998 | 391 | if (size < TPM_HEADER_SIZE) { |
b697e0ff SG |
392 | debug("Unable to read header\n"); |
393 | return size < 0 ? size : -EIO; | |
f6267998 RC |
394 | } |
395 | ||
396 | expected = get_unaligned_be32(buf + TPM_RSP_SIZE_BYTE); | |
397 | if ((size_t)expected > count) { | |
b697e0ff | 398 | debug("Error size=%x, expected=%x, count=%x\n", size, expected, |
f90acf1a | 399 | count); |
b697e0ff | 400 | return -ENOSPC; |
f6267998 RC |
401 | } |
402 | ||
b697e0ff | 403 | size += tpm_tis_i2c_recv_data(dev, &buf[TPM_HEADER_SIZE], |
e56e20eb | 404 | expected - TPM_HEADER_SIZE); |
f6267998 | 405 | if (size < expected) { |
b697e0ff SG |
406 | debug("Unable to read remainder of result\n"); |
407 | return -ETIMEDOUT; | |
f6267998 RC |
408 | } |
409 | ||
b697e0ff SG |
410 | rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, chip->timeout_c, |
411 | &status); | |
412 | if (rc) | |
413 | return rc; | |
1b393db5 | 414 | if (status & TPM_STS_DATA_AVAIL) { /* Retry? */ |
b697e0ff SG |
415 | debug("Error left over data\n"); |
416 | return -EIO; | |
f6267998 RC |
417 | } |
418 | ||
f6267998 RC |
419 | return size; |
420 | } | |
421 | ||
b697e0ff | 422 | static int tpm_tis_i2c_send(struct udevice *dev, const u8 *buf, size_t len) |
f6267998 | 423 | { |
b697e0ff | 424 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 | 425 | int rc, status; |
f90acf1a | 426 | size_t burstcnt; |
f6267998 | 427 | size_t count = 0; |
1b393db5 | 428 | int retry = 0; |
f6267998 RC |
429 | u8 sts = TPM_STS_GO; |
430 | ||
f90acf1a | 431 | debug("%s: len=%d\n", __func__, len); |
1b393db5 TWHT |
432 | if (len > TPM_DEV_BUFSIZE) |
433 | return -E2BIG; /* Command is too long for our tpm, sorry */ | |
f6267998 | 434 | |
b697e0ff | 435 | if (tpm_tis_i2c_request_locality(dev, 0) < 0) |
f6267998 RC |
436 | return -EBUSY; |
437 | ||
b697e0ff | 438 | status = tpm_tis_i2c_status(dev); |
f6267998 | 439 | if ((status & TPM_STS_COMMAND_READY) == 0) { |
b697e0ff SG |
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; | |
f6267998 RC |
447 | } |
448 | ||
b697e0ff | 449 | burstcnt = tpm_tis_i2c_get_burstcount(dev); |
f6267998 | 450 | |
1b393db5 TWHT |
451 | /* burstcount < 0 -> tpm is busy */ |
452 | if (burstcnt < 0) | |
453 | return burstcnt; | |
f6267998 | 454 | |
f90acf1a SG |
455 | while (count < len) { |
456 | udelay(300); | |
457 | if (burstcnt > len - count) | |
458 | burstcnt = len - count; | |
f6267998 | 459 | |
1b393db5 | 460 | #ifdef CONFIG_TPM_TIS_I2C_BURST_LIMITATION |
b697e0ff SG |
461 | if (retry && burstcnt > CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN) |
462 | burstcnt = CONFIG_TPM_TIS_I2C_BURST_LIMITATION_LEN; | |
1b393db5 | 463 | #endif /* CONFIG_TPM_TIS_I2C_BURST_LIMITATION */ |
f6267998 | 464 | |
b697e0ff SG |
465 | rc = tpm_tis_i2c_write(dev, TPM_DATA_FIFO(chip->locality), |
466 | &(buf[count]), burstcnt); | |
f6267998 RC |
467 | if (rc == 0) |
468 | count += burstcnt; | |
1b393db5 | 469 | else { |
f90acf1a | 470 | debug("%s: error\n", __func__); |
b697e0ff SG |
471 | if (retry++ > 10) |
472 | return -EIO; | |
473 | rc = tpm_tis_i2c_wait_for_stat(dev, TPM_STS_VALID, | |
e56e20eb SG |
474 | chip->timeout_c, |
475 | &status); | |
f90acf1a | 476 | if (rc) |
b697e0ff | 477 | return rc; |
1b393db5 | 478 | |
b697e0ff SG |
479 | if ((status & TPM_STS_DATA_EXPECT) == 0) |
480 | return -EIO; | |
f6267998 RC |
481 | } |
482 | } | |
483 | ||
1b393db5 | 484 | /* Go and do it */ |
b697e0ff SG |
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); | |
f6267998 RC |
489 | |
490 | return len; | |
b697e0ff SG |
491 | } |
492 | ||
493 | static int tpm_tis_i2c_cleanup(struct udevice *dev) | |
494 | { | |
495 | struct tpm_chip *chip = dev_get_priv(dev); | |
1b393db5 | 496 | |
b697e0ff | 497 | tpm_tis_i2c_ready(dev); |
1b393db5 TWHT |
498 | /* |
499 | * The TPM needs some time to clean up here, | |
f6267998 RC |
500 | * so we sleep rather than keeping the bus busy |
501 | */ | |
42c8ec56 | 502 | mdelay(2); |
b697e0ff | 503 | tpm_tis_i2c_release_locality(dev, chip->locality, 0); |
f6267998 | 504 | |
b697e0ff | 505 | return 0; |
ec34fa5e VP |
506 | } |
507 | ||
13932b09 | 508 | static int tpm_tis_i2c_init(struct udevice *dev) |
f6267998 | 509 | { |
b697e0ff | 510 | struct tpm_chip *chip = dev_get_priv(dev); |
f6267998 | 511 | u32 vendor; |
ec34fa5e | 512 | u32 expected_did_vid; |
b697e0ff | 513 | int rc; |
f6267998 | 514 | |
7c73537e | 515 | chip->is_open = 1; |
f6267998 | 516 | |
e56e20eb | 517 | /* Default timeouts - these could move to the device tree */ |
42c8ec56 SG |
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; | |
f6267998 | 522 | |
b697e0ff SG |
523 | rc = tpm_tis_i2c_request_locality(dev, 0); |
524 | if (rc < 0) | |
525 | return rc; | |
f6267998 | 526 | |
1b393db5 | 527 | /* Read four bytes from DID_VID register */ |
b697e0ff SG |
528 | if (tpm_tis_i2c_read(dev, TPM_DID_VID(0), (uchar *)&vendor, 4) < 0) { |
529 | tpm_tis_i2c_release_locality(dev, 0, 1); | |
f90acf1a | 530 | return -EIO; |
f6267998 RC |
531 | } |
532 | ||
b697e0ff | 533 | if (chip->chip_type == SLB9635) { |
ec34fa5e VP |
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 | } | |
f6267998 | 540 | |
b697e0ff | 541 | if (chip->chip_type != UNKNOWN && vendor != expected_did_vid) { |
1b393db5 | 542 | error("Vendor id did not match! ID was %08x\n", vendor); |
f90acf1a | 543 | return -ENODEV; |
f6267998 RC |
544 | } |
545 | ||
b697e0ff | 546 | chip->vend_dev = vendor; |
1b393db5 | 547 | debug("1.2 TPM (chip type %s device-id 0x%X)\n", |
b697e0ff | 548 | chip_name[chip->chip_type], vendor >> 16); |
f6267998 RC |
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; | |
f90acf1a SG |
556 | } |
557 | ||
b697e0ff | 558 | static int tpm_tis_i2c_open(struct udevice *dev) |
4cd7b783 | 559 | { |
b697e0ff | 560 | struct tpm_chip *chip = dev_get_priv(dev); |
4cd7b783 | 561 | int rc; |
4cd7b783 | 562 | |
b697e0ff SG |
563 | debug("%s: start\n", __func__); |
564 | if (chip->is_open) | |
565 | return -EBUSY; | |
566 | rc = tpm_tis_i2c_init(dev); | |
4cd7b783 | 567 | if (rc < 0) |
b697e0ff | 568 | chip->is_open = 0; |
4cd7b783 | 569 | |
4cd7b783 SG |
570 | return rc; |
571 | } | |
572 | ||
b697e0ff | 573 | static int tpm_tis_i2c_close(struct udevice *dev) |
4cd7b783 | 574 | { |
b697e0ff | 575 | struct tpm_chip *chip = dev_get_priv(dev); |
4cd7b783 | 576 | |
b697e0ff SG |
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; | |
4cd7b783 SG |
581 | } |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
b697e0ff | 586 | static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size) |
4cd7b783 | 587 | { |
b697e0ff | 588 | struct tpm_chip *chip = dev_get_priv(dev); |
4cd7b783 | 589 | |
b697e0ff SG |
590 | if (size < 50) |
591 | return -ENOSPC; | |
4cd7b783 | 592 | |
b697e0ff SG |
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); | |
4cd7b783 SG |
597 | } |
598 | ||
b697e0ff | 599 | static int tpm_tis_i2c_probe(struct udevice *dev) |
4cd7b783 | 600 | { |
b697e0ff SG |
601 | struct tpm_chip_priv *uc_priv = dev_get_uclass_priv(dev); |
602 | struct tpm_chip *chip = dev_get_priv(dev); | |
4cd7b783 | 603 | |
b697e0ff | 604 | chip->chip_type = dev_get_driver_data(dev); |
4cd7b783 | 605 | |
b697e0ff SG |
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; | |
4cd7b783 SG |
611 | |
612 | return 0; | |
613 | } | |
614 | ||
b697e0ff SG |
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 | }; | |
4cd7b783 | 623 | |
b697e0ff SG |
624 | static const struct udevice_id tpm_tis_i2c_ids[] = { |
625 | { .compatible = "infineon,slb9635tt", .data = SLB9635 }, | |
626 | { .compatible = "infineon,slb9645tt", .data = SLB9645 }, | |
627 | { } | |
628 | }; | |
4cd7b783 | 629 | |
b697e0ff | 630 | U_BOOT_DRIVER(tpm_tis_i2c) = { |
0766ad2f | 631 | .name = "tpm_tis_infineon", |
b697e0ff SG |
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 | }; |