Commit | Line | Data |
---|---|---|
27084efe LD |
1 | /* |
2 | * Copyright (C) 2005, 2006 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Leendert van Doorn <leendert@watson.ibm.com> | |
6 | * Kylene Hall <kjhall@us.ibm.com> | |
7 | * | |
8e81cc13 KY |
8 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
9 | * | |
27084efe LD |
10 | * Device driver for TCG/TCPA TPM (trusted platform module). |
11 | * Specifications at www.trustedcomputinggroup.org | |
12 | * | |
13 | * This device driver implements the TPM interface as defined in | |
14 | * the TCG TPM Interface Spec version 1.2, revision 1.0. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License as | |
18 | * published by the Free Software Foundation, version 2 of the | |
19 | * License. | |
20 | */ | |
57135568 KJH |
21 | #include <linux/init.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/moduleparam.h> | |
27084efe | 24 | #include <linux/pnp.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
27084efe LD |
26 | #include <linux/interrupt.h> |
27 | #include <linux/wait.h> | |
3f0d3d01 | 28 | #include <linux/acpi.h> |
20b87bbf | 29 | #include <linux/freezer.h> |
27084efe LD |
30 | #include "tpm.h" |
31 | ||
27084efe LD |
32 | enum tis_access { |
33 | TPM_ACCESS_VALID = 0x80, | |
34 | TPM_ACCESS_ACTIVE_LOCALITY = 0x20, | |
35 | TPM_ACCESS_REQUEST_PENDING = 0x04, | |
36 | TPM_ACCESS_REQUEST_USE = 0x02, | |
37 | }; | |
38 | ||
39 | enum tis_status { | |
40 | TPM_STS_VALID = 0x80, | |
41 | TPM_STS_COMMAND_READY = 0x40, | |
42 | TPM_STS_GO = 0x20, | |
43 | TPM_STS_DATA_AVAIL = 0x10, | |
44 | TPM_STS_DATA_EXPECT = 0x08, | |
45 | }; | |
46 | ||
47 | enum tis_int_flags { | |
48 | TPM_GLOBAL_INT_ENABLE = 0x80000000, | |
49 | TPM_INTF_BURST_COUNT_STATIC = 0x100, | |
50 | TPM_INTF_CMD_READY_INT = 0x080, | |
51 | TPM_INTF_INT_EDGE_FALLING = 0x040, | |
52 | TPM_INTF_INT_EDGE_RISING = 0x020, | |
53 | TPM_INTF_INT_LEVEL_LOW = 0x010, | |
54 | TPM_INTF_INT_LEVEL_HIGH = 0x008, | |
55 | TPM_INTF_LOCALITY_CHANGE_INT = 0x004, | |
56 | TPM_INTF_STS_VALID_INT = 0x002, | |
57 | TPM_INTF_DATA_AVAIL_INT = 0x001, | |
58 | }; | |
59 | ||
36b20020 | 60 | enum tis_defaults { |
2a7362f5 | 61 | TIS_MEM_BASE = 0xFED40000, |
b09d5300 | 62 | TIS_MEM_LEN = 0x5000, |
cb535425 KJH |
63 | TIS_SHORT_TIMEOUT = 750, /* ms */ |
64 | TIS_LONG_TIMEOUT = 2000, /* 2 sec */ | |
36b20020 KJH |
65 | }; |
66 | ||
27084efe LD |
67 | #define TPM_ACCESS(l) (0x0000 | ((l) << 12)) |
68 | #define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12)) | |
69 | #define TPM_INT_VECTOR(l) (0x000C | ((l) << 12)) | |
70 | #define TPM_INT_STATUS(l) (0x0010 | ((l) << 12)) | |
71 | #define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12)) | |
72 | #define TPM_STS(l) (0x0018 | ((l) << 12)) | |
73 | #define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12)) | |
74 | ||
75 | #define TPM_DID_VID(l) (0x0F00 | ((l) << 12)) | |
76 | #define TPM_RID(l) (0x0F04 | ((l) << 12)) | |
77 | ||
78 | static LIST_HEAD(tis_chips); | |
4e70daaf | 79 | static DEFINE_MUTEX(tis_lock); |
27084efe | 80 | |
1560ffe6 | 81 | #if defined(CONFIG_PNP) && defined(CONFIG_ACPI) |
3f0d3d01 MG |
82 | static int is_itpm(struct pnp_dev *dev) |
83 | { | |
84 | struct acpi_device *acpi = pnp_acpi_device(dev); | |
85 | struct acpi_hardware_id *id; | |
86 | ||
6e38bfaa KY |
87 | if (!acpi) |
88 | return 0; | |
89 | ||
3f0d3d01 MG |
90 | list_for_each_entry(id, &acpi->pnp.ids, list) { |
91 | if (!strcmp("INTC0102", id->id)) | |
92 | return 1; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
1560ffe6 RD |
97 | #else |
98 | static inline int is_itpm(struct pnp_dev *dev) | |
99 | { | |
100 | return 0; | |
101 | } | |
3f0d3d01 MG |
102 | #endif |
103 | ||
7240b983 JG |
104 | /* Before we attempt to access the TPM we must see that the valid bit is set. |
105 | * The specification says that this bit is 0 at reset and remains 0 until the | |
106 | * 'TPM has gone through its self test and initialization and has established | |
107 | * correct values in the other bits.' */ | |
108 | static int wait_startup(struct tpm_chip *chip, int l) | |
109 | { | |
110 | unsigned long stop = jiffies + chip->vendor.timeout_a; | |
111 | do { | |
112 | if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) & | |
113 | TPM_ACCESS_VALID) | |
114 | return 0; | |
115 | msleep(TPM_TIMEOUT); | |
116 | } while (time_before(jiffies, stop)); | |
117 | return -1; | |
118 | } | |
119 | ||
27084efe LD |
120 | static int check_locality(struct tpm_chip *chip, int l) |
121 | { | |
122 | if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) & | |
123 | (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == | |
124 | (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) | |
125 | return chip->vendor.locality = l; | |
126 | ||
127 | return -1; | |
128 | } | |
129 | ||
130 | static void release_locality(struct tpm_chip *chip, int l, int force) | |
131 | { | |
132 | if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) & | |
133 | (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) == | |
134 | (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) | |
135 | iowrite8(TPM_ACCESS_ACTIVE_LOCALITY, | |
136 | chip->vendor.iobase + TPM_ACCESS(l)); | |
137 | } | |
138 | ||
139 | static int request_locality(struct tpm_chip *chip, int l) | |
140 | { | |
20b87bbf | 141 | unsigned long stop, timeout; |
27084efe LD |
142 | long rc; |
143 | ||
144 | if (check_locality(chip, l) >= 0) | |
145 | return l; | |
146 | ||
147 | iowrite8(TPM_ACCESS_REQUEST_USE, | |
148 | chip->vendor.iobase + TPM_ACCESS(l)); | |
149 | ||
20b87bbf SB |
150 | stop = jiffies + chip->vendor.timeout_a; |
151 | ||
27084efe | 152 | if (chip->vendor.irq) { |
20b87bbf SB |
153 | again: |
154 | timeout = stop - jiffies; | |
155 | if ((long)timeout <= 0) | |
156 | return -1; | |
36b20020 | 157 | rc = wait_event_interruptible_timeout(chip->vendor.int_queue, |
27084efe LD |
158 | (check_locality |
159 | (chip, l) >= 0), | |
20b87bbf | 160 | timeout); |
27084efe LD |
161 | if (rc > 0) |
162 | return l; | |
20b87bbf SB |
163 | if (rc == -ERESTARTSYS && freezing(current)) { |
164 | clear_thread_flag(TIF_SIGPENDING); | |
165 | goto again; | |
166 | } | |
27084efe LD |
167 | } else { |
168 | /* wait for burstcount */ | |
27084efe LD |
169 | do { |
170 | if (check_locality(chip, l) >= 0) | |
171 | return l; | |
172 | msleep(TPM_TIMEOUT); | |
173 | } | |
174 | while (time_before(jiffies, stop)); | |
175 | } | |
176 | return -1; | |
177 | } | |
178 | ||
179 | static u8 tpm_tis_status(struct tpm_chip *chip) | |
180 | { | |
181 | return ioread8(chip->vendor.iobase + | |
182 | TPM_STS(chip->vendor.locality)); | |
183 | } | |
184 | ||
185 | static void tpm_tis_ready(struct tpm_chip *chip) | |
186 | { | |
187 | /* this causes the current command to be aborted */ | |
188 | iowrite8(TPM_STS_COMMAND_READY, | |
189 | chip->vendor.iobase + TPM_STS(chip->vendor.locality)); | |
190 | } | |
191 | ||
192 | static int get_burstcount(struct tpm_chip *chip) | |
193 | { | |
194 | unsigned long stop; | |
195 | int burstcnt; | |
196 | ||
197 | /* wait for burstcount */ | |
198 | /* which timeout value, spec has 2 answers (c & d) */ | |
36b20020 | 199 | stop = jiffies + chip->vendor.timeout_d; |
27084efe LD |
200 | do { |
201 | burstcnt = ioread8(chip->vendor.iobase + | |
202 | TPM_STS(chip->vendor.locality) + 1); | |
203 | burstcnt += ioread8(chip->vendor.iobase + | |
204 | TPM_STS(chip->vendor.locality) + | |
205 | 2) << 8; | |
206 | if (burstcnt) | |
207 | return burstcnt; | |
208 | msleep(TPM_TIMEOUT); | |
209 | } while (time_before(jiffies, stop)); | |
210 | return -EBUSY; | |
211 | } | |
212 | ||
cb535425 | 213 | static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) |
27084efe LD |
214 | { |
215 | int size = 0, burstcnt; | |
216 | while (size < count && | |
fd048866 RA |
217 | wait_for_tpm_stat(chip, |
218 | TPM_STS_DATA_AVAIL | TPM_STS_VALID, | |
219 | chip->vendor.timeout_c, | |
78f09cc2 | 220 | &chip->vendor.read_queue, true) |
27084efe LD |
221 | == 0) { |
222 | burstcnt = get_burstcount(chip); | |
223 | for (; burstcnt > 0 && size < count; burstcnt--) | |
224 | buf[size++] = ioread8(chip->vendor.iobase + | |
225 | TPM_DATA_FIFO(chip->vendor. | |
226 | locality)); | |
227 | } | |
228 | return size; | |
229 | } | |
230 | ||
cb535425 | 231 | static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count) |
27084efe LD |
232 | { |
233 | int size = 0; | |
234 | int expected, status; | |
235 | ||
236 | if (count < TPM_HEADER_SIZE) { | |
237 | size = -EIO; | |
238 | goto out; | |
239 | } | |
240 | ||
241 | /* read first 10 bytes, including tag, paramsize, and result */ | |
242 | if ((size = | |
243 | recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) { | |
244 | dev_err(chip->dev, "Unable to read header\n"); | |
245 | goto out; | |
246 | } | |
247 | ||
248 | expected = be32_to_cpu(*(__be32 *) (buf + 2)); | |
249 | if (expected > count) { | |
250 | size = -EIO; | |
251 | goto out; | |
252 | } | |
253 | ||
254 | if ((size += | |
255 | recv_data(chip, &buf[TPM_HEADER_SIZE], | |
256 | expected - TPM_HEADER_SIZE)) < expected) { | |
257 | dev_err(chip->dev, "Unable to read remainder of result\n"); | |
258 | size = -ETIME; | |
259 | goto out; | |
260 | } | |
261 | ||
fd048866 | 262 | wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, |
78f09cc2 | 263 | &chip->vendor.int_queue, false); |
27084efe LD |
264 | status = tpm_tis_status(chip); |
265 | if (status & TPM_STS_DATA_AVAIL) { /* retry? */ | |
266 | dev_err(chip->dev, "Error left over data\n"); | |
267 | size = -EIO; | |
268 | goto out; | |
269 | } | |
270 | ||
271 | out: | |
272 | tpm_tis_ready(chip); | |
273 | release_locality(chip, chip->vendor.locality, 0); | |
274 | return size; | |
275 | } | |
276 | ||
90ab5ee9 | 277 | static bool itpm; |
3507d612 RA |
278 | module_param(itpm, bool, 0444); |
279 | MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); | |
280 | ||
27084efe LD |
281 | /* |
282 | * If interrupts are used (signaled by an irq set in the vendor structure) | |
283 | * tpm.c can skip polling for the data to be available as the interrupt is | |
284 | * waited for here | |
285 | */ | |
9519de3f | 286 | static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) |
27084efe LD |
287 | { |
288 | int rc, status, burstcnt; | |
289 | size_t count = 0; | |
27084efe LD |
290 | |
291 | if (request_locality(chip, 0) < 0) | |
292 | return -EBUSY; | |
293 | ||
294 | status = tpm_tis_status(chip); | |
295 | if ((status & TPM_STS_COMMAND_READY) == 0) { | |
296 | tpm_tis_ready(chip); | |
fd048866 | 297 | if (wait_for_tpm_stat |
27084efe | 298 | (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b, |
78f09cc2 | 299 | &chip->vendor.int_queue, false) < 0) { |
27084efe LD |
300 | rc = -ETIME; |
301 | goto out_err; | |
302 | } | |
303 | } | |
304 | ||
305 | while (count < len - 1) { | |
306 | burstcnt = get_burstcount(chip); | |
307 | for (; burstcnt > 0 && count < len - 1; burstcnt--) { | |
308 | iowrite8(buf[count], chip->vendor.iobase + | |
309 | TPM_DATA_FIFO(chip->vendor.locality)); | |
310 | count++; | |
311 | } | |
312 | ||
fd048866 | 313 | wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, |
78f09cc2 | 314 | &chip->vendor.int_queue, false); |
27084efe | 315 | status = tpm_tis_status(chip); |
3507d612 | 316 | if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) { |
27084efe LD |
317 | rc = -EIO; |
318 | goto out_err; | |
319 | } | |
320 | } | |
321 | ||
322 | /* write last byte */ | |
323 | iowrite8(buf[count], | |
9519de3f | 324 | chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality)); |
fd048866 | 325 | wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, |
78f09cc2 | 326 | &chip->vendor.int_queue, false); |
27084efe LD |
327 | status = tpm_tis_status(chip); |
328 | if ((status & TPM_STS_DATA_EXPECT) != 0) { | |
329 | rc = -EIO; | |
330 | goto out_err; | |
331 | } | |
332 | ||
9519de3f SB |
333 | return 0; |
334 | ||
335 | out_err: | |
336 | tpm_tis_ready(chip); | |
337 | release_locality(chip, chip->vendor.locality, 0); | |
338 | return rc; | |
339 | } | |
340 | ||
341 | /* | |
342 | * If interrupts are used (signaled by an irq set in the vendor structure) | |
343 | * tpm.c can skip polling for the data to be available as the interrupt is | |
344 | * waited for here | |
345 | */ | |
346 | static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) | |
347 | { | |
348 | int rc; | |
349 | u32 ordinal; | |
350 | ||
351 | rc = tpm_tis_send_data(chip, buf, len); | |
352 | if (rc < 0) | |
353 | return rc; | |
354 | ||
27084efe LD |
355 | /* go and do it */ |
356 | iowrite8(TPM_STS_GO, | |
357 | chip->vendor.iobase + TPM_STS(chip->vendor.locality)); | |
358 | ||
359 | if (chip->vendor.irq) { | |
360 | ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); | |
fd048866 | 361 | if (wait_for_tpm_stat |
27084efe LD |
362 | (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
363 | tpm_calc_ordinal_duration(chip, ordinal), | |
78f09cc2 | 364 | &chip->vendor.read_queue, false) < 0) { |
27084efe LD |
365 | rc = -ETIME; |
366 | goto out_err; | |
367 | } | |
368 | } | |
369 | return len; | |
370 | out_err: | |
371 | tpm_tis_ready(chip); | |
372 | release_locality(chip, chip->vendor.locality, 0); | |
373 | return rc; | |
374 | } | |
375 | ||
8e54caf4 JG |
376 | struct tis_vendor_timeout_override { |
377 | u32 did_vid; | |
378 | unsigned long timeout_us[4]; | |
379 | }; | |
380 | ||
381 | static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = { | |
382 | /* Atmel 3204 */ | |
383 | { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000), | |
384 | (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } }, | |
385 | }; | |
386 | ||
387 | static bool tpm_tis_update_timeouts(struct tpm_chip *chip, | |
388 | unsigned long *timeout_cap) | |
389 | { | |
390 | int i; | |
391 | u32 did_vid; | |
392 | ||
393 | did_vid = ioread32(chip->vendor.iobase + TPM_DID_VID(0)); | |
394 | ||
395 | for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) { | |
396 | if (vendor_timeout_overrides[i].did_vid != did_vid) | |
397 | continue; | |
398 | memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us, | |
399 | sizeof(vendor_timeout_overrides[i].timeout_us)); | |
400 | return true; | |
401 | } | |
402 | ||
403 | return false; | |
404 | } | |
405 | ||
9519de3f SB |
406 | /* |
407 | * Early probing for iTPM with STS_DATA_EXPECT flaw. | |
408 | * Try sending command without itpm flag set and if that | |
409 | * fails, repeat with itpm flag set. | |
410 | */ | |
411 | static int probe_itpm(struct tpm_chip *chip) | |
412 | { | |
413 | int rc = 0; | |
414 | u8 cmd_getticks[] = { | |
415 | 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, | |
416 | 0x00, 0x00, 0x00, 0xf1 | |
417 | }; | |
418 | size_t len = sizeof(cmd_getticks); | |
968de8e2 | 419 | bool rem_itpm = itpm; |
4e401fb0 SB |
420 | u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0)); |
421 | ||
422 | /* probe only iTPMS */ | |
423 | if (vendor != TPM_VID_INTEL) | |
424 | return 0; | |
9519de3f | 425 | |
73249695 | 426 | itpm = false; |
9519de3f SB |
427 | |
428 | rc = tpm_tis_send_data(chip, cmd_getticks, len); | |
429 | if (rc == 0) | |
430 | goto out; | |
431 | ||
432 | tpm_tis_ready(chip); | |
433 | release_locality(chip, chip->vendor.locality, 0); | |
434 | ||
73249695 | 435 | itpm = true; |
9519de3f SB |
436 | |
437 | rc = tpm_tis_send_data(chip, cmd_getticks, len); | |
438 | if (rc == 0) { | |
439 | dev_info(chip->dev, "Detected an iTPM.\n"); | |
440 | rc = 1; | |
441 | } else | |
442 | rc = -EFAULT; | |
443 | ||
444 | out: | |
445 | itpm = rem_itpm; | |
446 | tpm_tis_ready(chip); | |
447 | release_locality(chip, chip->vendor.locality, 0); | |
448 | ||
449 | return rc; | |
450 | } | |
451 | ||
1f866057 SB |
452 | static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) |
453 | { | |
454 | switch (chip->vendor.manufacturer_id) { | |
455 | case TPM_VID_WINBOND: | |
456 | return ((status == TPM_STS_VALID) || | |
457 | (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY))); | |
458 | case TPM_VID_STM: | |
459 | return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)); | |
460 | default: | |
461 | return (status == TPM_STS_COMMAND_READY); | |
462 | } | |
463 | } | |
464 | ||
01ad1fa7 | 465 | static const struct tpm_class_ops tpm_tis = { |
27084efe LD |
466 | .status = tpm_tis_status, |
467 | .recv = tpm_tis_recv, | |
468 | .send = tpm_tis_send, | |
469 | .cancel = tpm_tis_ready, | |
8e54caf4 | 470 | .update_timeouts = tpm_tis_update_timeouts, |
27084efe LD |
471 | .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, |
472 | .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, | |
1f866057 | 473 | .req_canceled = tpm_tis_req_canceled, |
27084efe LD |
474 | }; |
475 | ||
7d12e780 | 476 | static irqreturn_t tis_int_probe(int irq, void *dev_id) |
27084efe | 477 | { |
06efcad0 | 478 | struct tpm_chip *chip = dev_id; |
27084efe LD |
479 | u32 interrupt; |
480 | ||
481 | interrupt = ioread32(chip->vendor.iobase + | |
482 | TPM_INT_STATUS(chip->vendor.locality)); | |
483 | ||
484 | if (interrupt == 0) | |
485 | return IRQ_NONE; | |
486 | ||
a7b66822 | 487 | chip->vendor.probed_irq = irq; |
27084efe LD |
488 | |
489 | /* Clear interrupts handled with TPM_EOI */ | |
490 | iowrite32(interrupt, | |
491 | chip->vendor.iobase + | |
492 | TPM_INT_STATUS(chip->vendor.locality)); | |
493 | return IRQ_HANDLED; | |
494 | } | |
495 | ||
a6f97b29 | 496 | static irqreturn_t tis_int_handler(int dummy, void *dev_id) |
27084efe | 497 | { |
06efcad0 | 498 | struct tpm_chip *chip = dev_id; |
27084efe LD |
499 | u32 interrupt; |
500 | int i; | |
501 | ||
502 | interrupt = ioread32(chip->vendor.iobase + | |
503 | TPM_INT_STATUS(chip->vendor.locality)); | |
504 | ||
505 | if (interrupt == 0) | |
506 | return IRQ_NONE; | |
507 | ||
508 | if (interrupt & TPM_INTF_DATA_AVAIL_INT) | |
509 | wake_up_interruptible(&chip->vendor.read_queue); | |
510 | if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT) | |
511 | for (i = 0; i < 5; i++) | |
512 | if (check_locality(chip, i) >= 0) | |
513 | break; | |
514 | if (interrupt & | |
515 | (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT | | |
516 | TPM_INTF_CMD_READY_INT)) | |
517 | wake_up_interruptible(&chip->vendor.int_queue); | |
518 | ||
519 | /* Clear interrupts handled with TPM_EOI */ | |
520 | iowrite32(interrupt, | |
521 | chip->vendor.iobase + | |
522 | TPM_INT_STATUS(chip->vendor.locality)); | |
cab091ea | 523 | ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality)); |
27084efe LD |
524 | return IRQ_HANDLED; |
525 | } | |
526 | ||
73249695 | 527 | static bool interrupts = true; |
57135568 KJH |
528 | module_param(interrupts, bool, 0444); |
529 | MODULE_PARM_DESC(interrupts, "Enable interrupts"); | |
530 | ||
c3c36aa9 | 531 | static int tpm_tis_init(struct device *dev, resource_size_t start, |
7917ff9a | 532 | resource_size_t len, unsigned int irq) |
27084efe LD |
533 | { |
534 | u32 vendor, intfcaps, intmask; | |
968de8e2 | 535 | int rc, i, irq_s, irq_e, probe; |
27084efe LD |
536 | struct tpm_chip *chip; |
537 | ||
9e323d3e | 538 | if (!(chip = tpm_register_hardware(dev, &tpm_tis))) |
27084efe LD |
539 | return -ENODEV; |
540 | ||
541 | chip->vendor.iobase = ioremap(start, len); | |
542 | if (!chip->vendor.iobase) { | |
543 | rc = -EIO; | |
544 | goto out_err; | |
545 | } | |
546 | ||
ec579358 JG |
547 | /* Default timeouts */ |
548 | chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT); | |
549 | chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT); | |
550 | chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT); | |
551 | chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT); | |
552 | ||
7240b983 JG |
553 | if (wait_startup(chip, 0) != 0) { |
554 | rc = -ENODEV; | |
555 | goto out_err; | |
556 | } | |
557 | ||
05a462af MS |
558 | if (request_locality(chip, 0) != 0) { |
559 | rc = -ENODEV; | |
560 | goto out_err; | |
561 | } | |
562 | ||
27084efe | 563 | vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0)); |
3e3a5e90 | 564 | chip->vendor.manufacturer_id = vendor; |
27084efe | 565 | |
9e323d3e | 566 | dev_info(dev, |
27084efe LD |
567 | "1.2 TPM (device-id 0x%X, rev-id %d)\n", |
568 | vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0))); | |
569 | ||
9519de3f | 570 | if (!itpm) { |
968de8e2 SB |
571 | probe = probe_itpm(chip); |
572 | if (probe < 0) { | |
9519de3f SB |
573 | rc = -ENODEV; |
574 | goto out_err; | |
575 | } | |
73249695 | 576 | itpm = !!probe; |
9519de3f SB |
577 | } |
578 | ||
3507d612 RA |
579 | if (itpm) |
580 | dev_info(dev, "Intel iTPM workaround enabled\n"); | |
581 | ||
582 | ||
27084efe LD |
583 | /* Figure out the capabilities */ |
584 | intfcaps = | |
585 | ioread32(chip->vendor.iobase + | |
586 | TPM_INTF_CAPS(chip->vendor.locality)); | |
9e323d3e | 587 | dev_dbg(dev, "TPM interface capabilities (0x%x):\n", |
27084efe LD |
588 | intfcaps); |
589 | if (intfcaps & TPM_INTF_BURST_COUNT_STATIC) | |
9e323d3e | 590 | dev_dbg(dev, "\tBurst Count Static\n"); |
27084efe | 591 | if (intfcaps & TPM_INTF_CMD_READY_INT) |
9e323d3e | 592 | dev_dbg(dev, "\tCommand Ready Int Support\n"); |
27084efe | 593 | if (intfcaps & TPM_INTF_INT_EDGE_FALLING) |
9e323d3e | 594 | dev_dbg(dev, "\tInterrupt Edge Falling\n"); |
27084efe | 595 | if (intfcaps & TPM_INTF_INT_EDGE_RISING) |
9e323d3e | 596 | dev_dbg(dev, "\tInterrupt Edge Rising\n"); |
27084efe | 597 | if (intfcaps & TPM_INTF_INT_LEVEL_LOW) |
9e323d3e | 598 | dev_dbg(dev, "\tInterrupt Level Low\n"); |
27084efe | 599 | if (intfcaps & TPM_INTF_INT_LEVEL_HIGH) |
9e323d3e | 600 | dev_dbg(dev, "\tInterrupt Level High\n"); |
27084efe | 601 | if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT) |
9e323d3e | 602 | dev_dbg(dev, "\tLocality Change Int Support\n"); |
27084efe | 603 | if (intfcaps & TPM_INTF_STS_VALID_INT) |
9e323d3e | 604 | dev_dbg(dev, "\tSts Valid Int Support\n"); |
27084efe | 605 | if (intfcaps & TPM_INTF_DATA_AVAIL_INT) |
9e323d3e | 606 | dev_dbg(dev, "\tData Avail Int Support\n"); |
27084efe | 607 | |
a7b66822 | 608 | /* get the timeouts before testing for irqs */ |
7f326ed7 SB |
609 | if (tpm_get_timeouts(chip)) { |
610 | dev_err(dev, "Could not get TPM timeouts and durations\n"); | |
611 | rc = -ENODEV; | |
612 | goto out_err; | |
613 | } | |
a7b66822 | 614 | |
68d6e671 SB |
615 | if (tpm_do_selftest(chip)) { |
616 | dev_err(dev, "TPM self test failed\n"); | |
617 | rc = -ENODEV; | |
618 | goto out_err; | |
619 | } | |
620 | ||
27084efe LD |
621 | /* INTERRUPT Setup */ |
622 | init_waitqueue_head(&chip->vendor.read_queue); | |
623 | init_waitqueue_head(&chip->vendor.int_queue); | |
624 | ||
625 | intmask = | |
626 | ioread32(chip->vendor.iobase + | |
627 | TPM_INT_ENABLE(chip->vendor.locality)); | |
628 | ||
629 | intmask |= TPM_INTF_CMD_READY_INT | |
630 | | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT | |
631 | | TPM_INTF_STS_VALID_INT; | |
632 | ||
633 | iowrite32(intmask, | |
634 | chip->vendor.iobase + | |
635 | TPM_INT_ENABLE(chip->vendor.locality)); | |
7917ff9a BH |
636 | if (interrupts) |
637 | chip->vendor.irq = irq; | |
638 | if (interrupts && !chip->vendor.irq) { | |
a7b66822 | 639 | irq_s = |
57135568 KJH |
640 | ioread8(chip->vendor.iobase + |
641 | TPM_INT_VECTOR(chip->vendor.locality)); | |
a7b66822 SB |
642 | if (irq_s) { |
643 | irq_e = irq_s; | |
644 | } else { | |
645 | irq_s = 3; | |
646 | irq_e = 15; | |
647 | } | |
57135568 | 648 | |
a7b66822 | 649 | for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) { |
57135568 | 650 | iowrite8(i, chip->vendor.iobase + |
a7b66822 | 651 | TPM_INT_VECTOR(chip->vendor.locality)); |
57135568 | 652 | if (request_irq |
0f2ed4c6 | 653 | (i, tis_int_probe, IRQF_SHARED, |
57135568 KJH |
654 | chip->vendor.miscdev.name, chip) != 0) { |
655 | dev_info(chip->dev, | |
656 | "Unable to request irq: %d for probe\n", | |
657 | i); | |
658 | continue; | |
659 | } | |
27084efe | 660 | |
57135568 KJH |
661 | /* Clear all existing */ |
662 | iowrite32(ioread32 | |
663 | (chip->vendor.iobase + | |
664 | TPM_INT_STATUS(chip->vendor.locality)), | |
665 | chip->vendor.iobase + | |
666 | TPM_INT_STATUS(chip->vendor.locality)); | |
667 | ||
668 | /* Turn on */ | |
669 | iowrite32(intmask | TPM_GLOBAL_INT_ENABLE, | |
670 | chip->vendor.iobase + | |
671 | TPM_INT_ENABLE(chip->vendor.locality)); | |
672 | ||
a7b66822 SB |
673 | chip->vendor.probed_irq = 0; |
674 | ||
57135568 KJH |
675 | /* Generate Interrupts */ |
676 | tpm_gen_interrupt(chip); | |
677 | ||
a7b66822 SB |
678 | chip->vendor.irq = chip->vendor.probed_irq; |
679 | ||
680 | /* free_irq will call into tis_int_probe; | |
681 | clear all irqs we haven't seen while doing | |
682 | tpm_gen_interrupt */ | |
683 | iowrite32(ioread32 | |
684 | (chip->vendor.iobase + | |
685 | TPM_INT_STATUS(chip->vendor.locality)), | |
686 | chip->vendor.iobase + | |
687 | TPM_INT_STATUS(chip->vendor.locality)); | |
688 | ||
57135568 KJH |
689 | /* Turn off */ |
690 | iowrite32(intmask, | |
691 | chip->vendor.iobase + | |
692 | TPM_INT_ENABLE(chip->vendor.locality)); | |
693 | free_irq(i, chip); | |
27084efe | 694 | } |
27084efe LD |
695 | } |
696 | if (chip->vendor.irq) { | |
697 | iowrite8(chip->vendor.irq, | |
698 | chip->vendor.iobase + | |
699 | TPM_INT_VECTOR(chip->vendor.locality)); | |
700 | if (request_irq | |
0f2ed4c6 | 701 | (chip->vendor.irq, tis_int_handler, IRQF_SHARED, |
27084efe LD |
702 | chip->vendor.miscdev.name, chip) != 0) { |
703 | dev_info(chip->dev, | |
57135568 KJH |
704 | "Unable to request irq: %d for use\n", |
705 | chip->vendor.irq); | |
27084efe LD |
706 | chip->vendor.irq = 0; |
707 | } else { | |
708 | /* Clear all existing */ | |
709 | iowrite32(ioread32 | |
710 | (chip->vendor.iobase + | |
711 | TPM_INT_STATUS(chip->vendor.locality)), | |
712 | chip->vendor.iobase + | |
713 | TPM_INT_STATUS(chip->vendor.locality)); | |
714 | ||
715 | /* Turn on */ | |
716 | iowrite32(intmask | TPM_GLOBAL_INT_ENABLE, | |
717 | chip->vendor.iobase + | |
718 | TPM_INT_ENABLE(chip->vendor.locality)); | |
719 | } | |
720 | } | |
721 | ||
722 | INIT_LIST_HEAD(&chip->vendor.list); | |
4e70daaf | 723 | mutex_lock(&tis_lock); |
27084efe | 724 | list_add(&chip->vendor.list, &tis_chips); |
4e70daaf | 725 | mutex_unlock(&tis_lock); |
27084efe | 726 | |
27084efe LD |
727 | |
728 | return 0; | |
729 | out_err: | |
730 | if (chip->vendor.iobase) | |
731 | iounmap(chip->vendor.iobase); | |
732 | tpm_remove_hardware(chip->dev); | |
733 | return rc; | |
734 | } | |
96854310 | 735 | |
19b94d2d | 736 | #ifdef CONFIG_PM_SLEEP |
96854310 SB |
737 | static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) |
738 | { | |
739 | u32 intmask; | |
740 | ||
741 | /* reenable interrupts that device may have lost or | |
742 | BIOS/firmware may have disabled */ | |
743 | iowrite8(chip->vendor.irq, chip->vendor.iobase + | |
744 | TPM_INT_VECTOR(chip->vendor.locality)); | |
745 | ||
746 | intmask = | |
747 | ioread32(chip->vendor.iobase + | |
748 | TPM_INT_ENABLE(chip->vendor.locality)); | |
749 | ||
750 | intmask |= TPM_INTF_CMD_READY_INT | |
751 | | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT | |
752 | | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE; | |
753 | ||
754 | iowrite32(intmask, | |
755 | chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality)); | |
756 | } | |
96854310 | 757 | |
a2fa3fb0 SK |
758 | static int tpm_tis_resume(struct device *dev) |
759 | { | |
760 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
761 | int ret; | |
762 | ||
763 | if (chip->vendor.irq) | |
764 | tpm_tis_reenable_interrupts(chip); | |
765 | ||
766 | ret = tpm_pm_resume(dev); | |
767 | if (!ret) | |
768 | tpm_do_selftest(chip); | |
769 | ||
770 | return ret; | |
771 | } | |
772 | #endif | |
773 | ||
774 | static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume); | |
775 | ||
7f2ab000 | 776 | #ifdef CONFIG_PNP |
afc6d369 | 777 | static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, |
9e323d3e KJH |
778 | const struct pnp_device_id *pnp_id) |
779 | { | |
c3c36aa9 | 780 | resource_size_t start, len; |
7917ff9a BH |
781 | unsigned int irq = 0; |
782 | ||
9e323d3e KJH |
783 | start = pnp_mem_start(pnp_dev, 0); |
784 | len = pnp_mem_len(pnp_dev, 0); | |
785 | ||
7917ff9a BH |
786 | if (pnp_irq_valid(pnp_dev, 0)) |
787 | irq = pnp_irq(pnp_dev, 0); | |
788 | else | |
73249695 | 789 | interrupts = false; |
7917ff9a | 790 | |
e5cce6c1 | 791 | if (is_itpm(pnp_dev)) |
73249695 | 792 | itpm = true; |
e5cce6c1 | 793 | |
7917ff9a | 794 | return tpm_tis_init(&pnp_dev->dev, start, len, irq); |
9e323d3e KJH |
795 | } |
796 | ||
0bbed20e | 797 | static struct pnp_device_id tpm_pnp_tbl[] = { |
27084efe | 798 | {"PNP0C31", 0}, /* TPM */ |
93e1b7d4 KJH |
799 | {"ATM1200", 0}, /* Atmel */ |
800 | {"IFX0102", 0}, /* Infineon */ | |
801 | {"BCM0101", 0}, /* Broadcom */ | |
061991ec | 802 | {"BCM0102", 0}, /* Broadcom */ |
93e1b7d4 | 803 | {"NSC1200", 0}, /* National */ |
fb0e7e11 | 804 | {"ICO0102", 0}, /* Intel */ |
93e1b7d4 KJH |
805 | /* Add new here */ |
806 | {"", 0}, /* User Specified */ | |
807 | {"", 0} /* Terminator */ | |
27084efe | 808 | }; |
31bde71c | 809 | MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl); |
27084efe | 810 | |
39af33fc | 811 | static void tpm_tis_pnp_remove(struct pnp_dev *dev) |
253115b7 RA |
812 | { |
813 | struct tpm_chip *chip = pnp_get_drvdata(dev); | |
814 | ||
815 | tpm_dev_vendor_release(chip); | |
816 | ||
817 | kfree(chip); | |
818 | } | |
819 | ||
820 | ||
27084efe LD |
821 | static struct pnp_driver tis_pnp_driver = { |
822 | .name = "tpm_tis", | |
823 | .id_table = tpm_pnp_tbl, | |
824 | .probe = tpm_tis_pnp_init, | |
253115b7 | 825 | .remove = tpm_tis_pnp_remove, |
a2fa3fb0 SK |
826 | .driver = { |
827 | .pm = &tpm_tis_pm, | |
828 | }, | |
27084efe LD |
829 | }; |
830 | ||
93e1b7d4 KJH |
831 | #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2 |
832 | module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id, | |
833 | sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444); | |
834 | MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe"); | |
7f2ab000 | 835 | #endif |
7a192ec3 | 836 | |
7a192ec3 ML |
837 | static struct platform_driver tis_drv = { |
838 | .driver = { | |
839 | .name = "tpm_tis", | |
840 | .owner = THIS_MODULE, | |
b633f050 | 841 | .pm = &tpm_tis_pm, |
7a192ec3 | 842 | }, |
9e323d3e KJH |
843 | }; |
844 | ||
845 | static struct platform_device *pdev; | |
846 | ||
90ab5ee9 | 847 | static bool force; |
9e323d3e KJH |
848 | module_param(force, bool, 0444); |
849 | MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry"); | |
27084efe LD |
850 | static int __init init_tis(void) |
851 | { | |
9e323d3e | 852 | int rc; |
7f2ab000 RA |
853 | #ifdef CONFIG_PNP |
854 | if (!force) | |
855 | return pnp_register_driver(&tis_pnp_driver); | |
856 | #endif | |
9e323d3e | 857 | |
7f2ab000 RA |
858 | rc = platform_driver_register(&tis_drv); |
859 | if (rc < 0) | |
9e323d3e | 860 | return rc; |
4fba3c3b WY |
861 | pdev = platform_device_register_simple("tpm_tis", -1, NULL, 0); |
862 | if (IS_ERR(pdev)) { | |
863 | rc = PTR_ERR(pdev); | |
864 | goto err_dev; | |
9e323d3e | 865 | } |
4fba3c3b WY |
866 | rc = tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0); |
867 | if (rc) | |
868 | goto err_init; | |
869 | return 0; | |
870 | err_init: | |
871 | platform_device_unregister(pdev); | |
872 | err_dev: | |
873 | platform_driver_unregister(&tis_drv); | |
7f2ab000 | 874 | return rc; |
27084efe LD |
875 | } |
876 | ||
877 | static void __exit cleanup_tis(void) | |
878 | { | |
879 | struct tpm_vendor_specific *i, *j; | |
880 | struct tpm_chip *chip; | |
4e70daaf | 881 | mutex_lock(&tis_lock); |
27084efe LD |
882 | list_for_each_entry_safe(i, j, &tis_chips, list) { |
883 | chip = to_tpm_chip(i); | |
253115b7 | 884 | tpm_remove_hardware(chip->dev); |
27084efe LD |
885 | iowrite32(~TPM_GLOBAL_INT_ENABLE & |
886 | ioread32(chip->vendor.iobase + | |
887 | TPM_INT_ENABLE(chip->vendor. | |
888 | locality)), | |
889 | chip->vendor.iobase + | |
890 | TPM_INT_ENABLE(chip->vendor.locality)); | |
891 | release_locality(chip, chip->vendor.locality, 1); | |
892 | if (chip->vendor.irq) | |
893 | free_irq(chip->vendor.irq, chip); | |
894 | iounmap(i->iobase); | |
895 | list_del(&i->list); | |
27084efe | 896 | } |
4e70daaf | 897 | mutex_unlock(&tis_lock); |
7f2ab000 RA |
898 | #ifdef CONFIG_PNP |
899 | if (!force) { | |
9e323d3e | 900 | pnp_unregister_driver(&tis_pnp_driver); |
7f2ab000 RA |
901 | return; |
902 | } | |
903 | #endif | |
904 | platform_device_unregister(pdev); | |
905 | platform_driver_unregister(&tis_drv); | |
27084efe LD |
906 | } |
907 | ||
908 | module_init(init_tis); | |
909 | module_exit(cleanup_tis); | |
910 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); | |
911 | MODULE_DESCRIPTION("TPM Driver"); | |
912 | MODULE_VERSION("2.0"); | |
913 | MODULE_LICENSE("GPL"); |