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gerrit.cesnet.cz / github / trini / u-boot / ea697ae7eb059d7467c6854ce562c31df510eb59 / . / drivers / tpm / slb9635_i2c / tpm.c
blob: 496c48e8cf9bed01843fcce41868e32df2dd5f6f [file] [log] [blame]
Rong Changf6267992013-04-12 10:44:57 +0000[diff] [blame]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 * It is based on the Linux kernel driver tpm.c from Leendert van
12 * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
13 *
14 * Version: 2.1.1
15 *
16 * See file CREDITS for list of people who contributed to this
17 * project.
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License as
21 * published by the Free Software Foundation, version 2 of the
22 * License.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 * MA 02111-1307 USA
33 */
34
35#include <malloc.h>
36#include "tpm.h"
37
38/* global structure for tpm chip data */
39struct tpm_chip g_chip;
40
41enum tpm_duration {
42 TPM_SHORT = 0,
43 TPM_MEDIUM = 1,
44 TPM_LONG = 2,
45 TPM_UNDEFINED,
46};
47
48#define TPM_MAX_ORDINAL 243
49#define TPM_MAX_PROTECTED_ORDINAL 12
50#define TPM_PROTECTED_ORDINAL_MASK 0xFF
51
52/*
53 * Array with one entry per ordinal defining the maximum amount
54 * of time the chip could take to return the result. The ordinal
55 * designation of short, medium or long is defined in a table in
56 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
57 * values of the SHORT, MEDIUM, and LONG durations are retrieved
58 * from the chip during initialization with a call to tpm_get_timeouts.
59 */
60static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
61 TPM_UNDEFINED, /* 0 */
62 TPM_UNDEFINED,
63 TPM_UNDEFINED,
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED, /* 5 */
67 TPM_UNDEFINED,
68 TPM_UNDEFINED,
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_SHORT, /* 10 */
72 TPM_SHORT,
73};
74
75static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
76 TPM_UNDEFINED, /* 0 */
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED, /* 5 */
82 TPM_UNDEFINED,
83 TPM_UNDEFINED,
84 TPM_UNDEFINED,
85 TPM_UNDEFINED,
86 TPM_SHORT, /* 10 */
87 TPM_SHORT,
88 TPM_MEDIUM,
89 TPM_LONG,
90 TPM_LONG,
91 TPM_MEDIUM, /* 15 */
92 TPM_SHORT,
93 TPM_SHORT,
94 TPM_MEDIUM,
95 TPM_LONG,
96 TPM_SHORT, /* 20 */
97 TPM_SHORT,
98 TPM_MEDIUM,
99 TPM_MEDIUM,
100 TPM_MEDIUM,
101 TPM_SHORT, /* 25 */
102 TPM_SHORT,
103 TPM_MEDIUM,
104 TPM_SHORT,
105 TPM_SHORT,
106 TPM_MEDIUM, /* 30 */
107 TPM_LONG,
108 TPM_MEDIUM,
109 TPM_SHORT,
110 TPM_SHORT,
111 TPM_SHORT, /* 35 */
112 TPM_MEDIUM,
113 TPM_MEDIUM,
114 TPM_UNDEFINED,
115 TPM_UNDEFINED,
116 TPM_MEDIUM, /* 40 */
117 TPM_LONG,
118 TPM_MEDIUM,
119 TPM_SHORT,
120 TPM_SHORT,
121 TPM_SHORT, /* 45 */
122 TPM_SHORT,
123 TPM_SHORT,
124 TPM_SHORT,
125 TPM_LONG,
126 TPM_MEDIUM, /* 50 */
127 TPM_MEDIUM,
128 TPM_UNDEFINED,
129 TPM_UNDEFINED,
130 TPM_UNDEFINED,
131 TPM_UNDEFINED, /* 55 */
132 TPM_UNDEFINED,
133 TPM_UNDEFINED,
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_MEDIUM, /* 60 */
137 TPM_MEDIUM,
138 TPM_MEDIUM,
139 TPM_SHORT,
140 TPM_SHORT,
141 TPM_MEDIUM, /* 65 */
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_SHORT, /* 70 */
147 TPM_SHORT,
148 TPM_UNDEFINED,
149 TPM_UNDEFINED,
150 TPM_UNDEFINED,
151 TPM_UNDEFINED, /* 75 */
152 TPM_UNDEFINED,
153 TPM_UNDEFINED,
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_LONG, /* 80 */
157 TPM_UNDEFINED,
158 TPM_MEDIUM,
159 TPM_LONG,
160 TPM_SHORT,
161 TPM_UNDEFINED, /* 85 */
162 TPM_UNDEFINED,
163 TPM_UNDEFINED,
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_SHORT, /* 90 */
167 TPM_SHORT,
168 TPM_SHORT,
169 TPM_SHORT,
170 TPM_SHORT,
171 TPM_UNDEFINED, /* 95 */
172 TPM_UNDEFINED,
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_MEDIUM, /* 100 */
177 TPM_SHORT,
178 TPM_SHORT,
179 TPM_UNDEFINED,
180 TPM_UNDEFINED,
181 TPM_UNDEFINED, /* 105 */
182 TPM_UNDEFINED,
183 TPM_UNDEFINED,
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_SHORT, /* 110 */
187 TPM_SHORT,
188 TPM_SHORT,
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT, /* 115 */
192 TPM_SHORT,
193 TPM_SHORT,
194 TPM_UNDEFINED,
195 TPM_UNDEFINED,
196 TPM_LONG, /* 120 */
197 TPM_LONG,
198 TPM_MEDIUM,
199 TPM_UNDEFINED,
200 TPM_SHORT,
201 TPM_SHORT, /* 125 */
202 TPM_SHORT,
203 TPM_LONG,
204 TPM_SHORT,
205 TPM_SHORT,
206 TPM_SHORT, /* 130 */
207 TPM_MEDIUM,
208 TPM_UNDEFINED,
209 TPM_SHORT,
210 TPM_MEDIUM,
211 TPM_UNDEFINED, /* 135 */
212 TPM_UNDEFINED,
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED,
216 TPM_SHORT, /* 140 */
217 TPM_SHORT,
218 TPM_UNDEFINED,
219 TPM_UNDEFINED,
220 TPM_UNDEFINED,
221 TPM_UNDEFINED, /* 145 */
222 TPM_UNDEFINED,
223 TPM_UNDEFINED,
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_SHORT, /* 150 */
227 TPM_MEDIUM,
228 TPM_MEDIUM,
229 TPM_SHORT,
230 TPM_SHORT,
231 TPM_UNDEFINED, /* 155 */
232 TPM_UNDEFINED,
233 TPM_UNDEFINED,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_SHORT, /* 160 */
237 TPM_SHORT,
238 TPM_SHORT,
239 TPM_SHORT,
240 TPM_UNDEFINED,
241 TPM_UNDEFINED, /* 165 */
242 TPM_UNDEFINED,
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_LONG, /* 170 */
247 TPM_UNDEFINED,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED, /* 175 */
252 TPM_UNDEFINED,
253 TPM_UNDEFINED,
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_MEDIUM, /* 180 */
257 TPM_SHORT,
258 TPM_MEDIUM,
259 TPM_MEDIUM,
260 TPM_MEDIUM,
261 TPM_MEDIUM, /* 185 */
262 TPM_SHORT,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED, /* 190 */
267 TPM_UNDEFINED,
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_UNDEFINED,
271 TPM_UNDEFINED, /* 195 */
272 TPM_UNDEFINED,
273 TPM_UNDEFINED,
274 TPM_UNDEFINED,
275 TPM_UNDEFINED,
276 TPM_SHORT, /* 200 */
277 TPM_UNDEFINED,
278 TPM_UNDEFINED,
279 TPM_UNDEFINED,
280 TPM_SHORT,
281 TPM_SHORT, /* 205 */
282 TPM_SHORT,
283 TPM_SHORT,
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_MEDIUM, /* 210 */
287 TPM_UNDEFINED,
288 TPM_MEDIUM,
289 TPM_MEDIUM,
290 TPM_MEDIUM,
291 TPM_UNDEFINED, /* 215 */
292 TPM_MEDIUM,
293 TPM_UNDEFINED,
294 TPM_UNDEFINED,
295 TPM_SHORT,
296 TPM_SHORT, /* 220 */
297 TPM_SHORT,
298 TPM_SHORT,
299 TPM_SHORT,
300 TPM_SHORT,
301 TPM_UNDEFINED, /* 225 */
302 TPM_UNDEFINED,
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED,
306 TPM_SHORT, /* 230 */
307 TPM_LONG,
308 TPM_MEDIUM,
309 TPM_UNDEFINED,
310 TPM_UNDEFINED,
311 TPM_UNDEFINED, /* 235 */
312 TPM_UNDEFINED,
313 TPM_UNDEFINED,
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_SHORT, /* 240 */
317 TPM_UNDEFINED,
318 TPM_MEDIUM,
319};
320
321/*
322 * Returns max number of milliseconds to wait
323 */
324unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
325{
326 int duration_idx = TPM_UNDEFINED;
327 int duration = 0;
328
329 if (ordinal < TPM_MAX_ORDINAL)
330 duration_idx = tpm_ordinal_duration[ordinal];
331 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
332 TPM_MAX_PROTECTED_ORDINAL)
333 duration_idx =
334 tpm_protected_ordinal_duration[ordinal &
335 TPM_PROTECTED_ORDINAL_MASK];
336
337 if (duration_idx != TPM_UNDEFINED)
338 duration = chip->vendor.duration[duration_idx];
339 if (duration <= 0)
340 return 2 * 60 * HZ; /*two minutes timeout*/
341 else
342 return duration;
343}
344
345#define TPM_CMD_COUNT_BYTE 2
346#define TPM_CMD_ORDINAL_BYTE 6
347
348ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz)
349{
350 ssize_t rc;
351 u32 count, ordinal;
352 unsigned long start, stop;
353
354 struct tpm_chip *chip = &g_chip;
355
356 /* switch endianess: big->little */
357 count = get_unaligned_be32(buf + TPM_CMD_COUNT_BYTE);
358 ordinal = get_unaligned_be32(buf + TPM_CMD_ORDINAL_BYTE);
359
360 if (count == 0) {
361 dev_err(chip->dev, "no data\n");
362 return -ENODATA;
363 }
364 if (count > bufsiz) {
365 dev_err(chip->dev,
366 "invalid count value %x %zx\n", count, bufsiz);
367 return -E2BIG;
368 }
369
370 rc = chip->vendor.send(chip, (u8 *)buf, count);
371 if (rc < 0) {
372 dev_err(chip->dev, "tpm_transmit: tpm_send: error %zd\n", rc);
373 goto out;
374 }
375
376 if (chip->vendor.irq)
377 goto out_recv;
378
379 start = get_timer(0);
380 stop = tpm_calc_ordinal_duration(chip, ordinal);
381 do {
382 dbg_printf("waiting for status...\n");
383 u8 status = chip->vendor.status(chip);
384 if ((status & chip->vendor.req_complete_mask) ==
385 chip->vendor.req_complete_val) {
386 dbg_printf("...got it;\n");
387 goto out_recv;
388 }
389
390 if ((status == chip->vendor.req_canceled)) {
391 dev_err(chip->dev, "Operation Canceled\n");
392 rc = -ECANCELED;
393 goto out;
394 }
395 msleep(TPM_TIMEOUT);
396 } while (get_timer(start) < stop);
397
398 chip->vendor.cancel(chip);
399 dev_err(chip->dev, "Operation Timed out\n");
400 rc = -ETIME;
401 goto out;
402
403out_recv:
404
405 dbg_printf("out_recv: reading response...\n");
406 rc = chip->vendor.recv(chip, (u8 *)buf, TPM_BUFSIZE);
407 if (rc < 0)
408 dev_err(chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc);
409out:
410 return rc;
411}
412
413#define TPM_ERROR_SIZE 10
414
415enum tpm_capabilities {
416 TPM_CAP_PROP = cpu_to_be32(5),
417};
418
419enum tpm_sub_capabilities {
420 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
421 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
422};
423
424struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry)
425{
426 struct tpm_chip *chip;
427
428 /* Driver specific per-device data */
429 chip = &g_chip;
430 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
431 chip->is_open = 1;
432
433 return chip;
434}
435
436int tpm_open(uint32_t dev_addr)
437{
438 int rc;
439 if (g_chip.is_open)
440 return -EBUSY;
441 rc = tpm_vendor_init(dev_addr);
442 if (rc < 0)
443 g_chip.is_open = 0;
444 return rc;
445}
446
447void tpm_close(void)
448{
449 if (g_chip.is_open) {
450 tpm_vendor_cleanup(&g_chip);
451 g_chip.is_open = 0;
452 }
453}