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251a7b08 ML |
1 | /* |
2 | * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24 | |
3 | * Copyright (C) 2009, 2010 STMicroelectronics | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * STMicroelectronics version 1.2.0, Copyright (C) 2010 | |
20 | * STMicroelectronics comes with ABSOLUTELY NO WARRANTY. | |
21 | * This is free software, and you are welcome to redistribute it | |
22 | * under certain conditions. | |
23 | * | |
24 | * @Author: Christophe RICARD tpmsupport@st.com | |
25 | * | |
26 | * @File: tpm_stm_st33_i2c.c | |
27 | * | |
28 | * @Synopsis: | |
29 | * 09/15/2010: First shot driver tpm_tis driver for | |
30 | lpc is used as model. | |
31 | */ | |
32 | ||
3d7a7bd7 KY |
33 | #include <linux/pci.h> |
34 | #include <linux/module.h> | |
35 | #include <linux/platform_device.h> | |
36 | #include <linux/i2c.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/miscdevice.h> | |
3d7a7bd7 KY |
39 | #include <linux/kernel.h> |
40 | #include <linux/delay.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/wait.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/interrupt.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/sysfs.h> | |
47 | #include <linux/gpio.h> | |
48 | #include <linux/sched.h> | |
49 | #include <linux/uaccess.h> | |
50 | #include <linux/io.h> | |
51 | #include <linux/slab.h> | |
3d7a7bd7 KY |
52 | |
53 | #include "tpm.h" | |
9da228ea | 54 | #include "tpm_i2c_stm_st33.h" |
251a7b08 ML |
55 | |
56 | enum stm33zp24_access { | |
57 | TPM_ACCESS_VALID = 0x80, | |
58 | TPM_ACCESS_ACTIVE_LOCALITY = 0x20, | |
59 | TPM_ACCESS_REQUEST_PENDING = 0x04, | |
60 | TPM_ACCESS_REQUEST_USE = 0x02, | |
61 | }; | |
62 | ||
63 | enum stm33zp24_status { | |
64 | TPM_STS_VALID = 0x80, | |
65 | TPM_STS_COMMAND_READY = 0x40, | |
66 | TPM_STS_GO = 0x20, | |
67 | TPM_STS_DATA_AVAIL = 0x10, | |
68 | TPM_STS_DATA_EXPECT = 0x08, | |
69 | }; | |
70 | ||
71 | enum stm33zp24_int_flags { | |
72 | TPM_GLOBAL_INT_ENABLE = 0x80, | |
73 | TPM_INTF_CMD_READY_INT = 0x080, | |
74 | TPM_INTF_FIFO_AVALAIBLE_INT = 0x040, | |
75 | TPM_INTF_WAKE_UP_READY_INT = 0x020, | |
76 | TPM_INTF_LOCALITY_CHANGE_INT = 0x004, | |
77 | TPM_INTF_STS_VALID_INT = 0x002, | |
78 | TPM_INTF_DATA_AVAIL_INT = 0x001, | |
79 | }; | |
80 | ||
81 | enum tis_defaults { | |
82 | TIS_SHORT_TIMEOUT = 750, | |
83 | TIS_LONG_TIMEOUT = 2000, | |
84 | }; | |
85 | ||
86 | /* | |
87 | * write8_reg | |
88 | * Send byte to the TIS register according to the ST33ZP24 I2C protocol. | |
89 | * @param: tpm_register, the tpm tis register where the data should be written | |
90 | * @param: tpm_data, the tpm_data to write inside the tpm_register | |
91 | * @param: tpm_size, The length of the data | |
92 | * @return: Returns negative errno, or else the number of bytes written. | |
93 | */ | |
94 | static int write8_reg(struct i2c_client *client, u8 tpm_register, | |
95 | u8 *tpm_data, u16 tpm_size) | |
96 | { | |
251a7b08 ML |
97 | struct st33zp24_platform_data *pin_infos; |
98 | ||
99 | pin_infos = client->dev.platform_data; | |
100 | ||
64298919 PH |
101 | pin_infos->tpm_i2c_buffer[0][0] = tpm_register; |
102 | memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size); | |
7333549b | 103 | return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0], |
251a7b08 | 104 | tpm_size + 1); |
251a7b08 ML |
105 | } /* write8_reg() */ |
106 | ||
107 | /* | |
108 | * read8_reg | |
109 | * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. | |
110 | * @param: tpm_register, the tpm tis register where the data should be read | |
111 | * @param: tpm_data, the TPM response | |
112 | * @param: tpm_size, tpm TPM response size to read. | |
113 | * @return: number of byte read successfully: should be one if success. | |
114 | */ | |
115 | static int read8_reg(struct i2c_client *client, u8 tpm_register, | |
116 | u8 *tpm_data, int tpm_size) | |
117 | { | |
118 | u8 status = 0; | |
119 | u8 data; | |
251a7b08 ML |
120 | |
121 | data = TPM_DUMMY_BYTE; | |
122 | status = write8_reg(client, tpm_register, &data, 1); | |
123 | if (status == 2) | |
124 | status = i2c_master_recv(client, tpm_data, tpm_size); | |
125 | return status; | |
126 | } /* read8_reg() */ | |
127 | ||
128 | /* | |
129 | * I2C_WRITE_DATA | |
130 | * Send byte to the TIS register according to the ST33ZP24 I2C protocol. | |
131 | * @param: client, the chip description | |
132 | * @param: tpm_register, the tpm tis register where the data should be written | |
133 | * @param: tpm_data, the tpm_data to write inside the tpm_register | |
134 | * @param: tpm_size, The length of the data | |
135 | * @return: number of byte written successfully: should be one if success. | |
136 | */ | |
137 | #define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \ | |
138 | (write8_reg(client, tpm_register | \ | |
139 | TPM_WRITE_DIRECTION, tpm_data, tpm_size)) | |
140 | ||
141 | /* | |
142 | * I2C_READ_DATA | |
143 | * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. | |
144 | * @param: tpm, the chip description | |
145 | * @param: tpm_register, the tpm tis register where the data should be read | |
146 | * @param: tpm_data, the TPM response | |
147 | * @param: tpm_size, tpm TPM response size to read. | |
148 | * @return: number of byte read successfully: should be one if success. | |
149 | */ | |
150 | #define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \ | |
151 | (read8_reg(client, tpm_register, tpm_data, tpm_size)) | |
152 | ||
153 | /* | |
154 | * clear_interruption | |
155 | * clear the TPM interrupt register. | |
156 | * @param: tpm, the chip description | |
157 | */ | |
158 | static void clear_interruption(struct i2c_client *client) | |
159 | { | |
160 | u8 interrupt; | |
161 | I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1); | |
162 | I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1); | |
163 | I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1); | |
164 | } /* clear_interruption() */ | |
165 | ||
166 | /* | |
167 | * _wait_for_interrupt_serirq_timeout | |
168 | * @param: tpm, the chip description | |
169 | * @param: timeout, the timeout of the interrupt | |
170 | * @return: the status of the interruption. | |
171 | */ | |
172 | static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip, | |
173 | unsigned long timeout) | |
174 | { | |
175 | long status; | |
176 | struct i2c_client *client; | |
177 | struct st33zp24_platform_data *pin_infos; | |
178 | ||
2d089f82 | 179 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
180 | pin_infos = client->dev.platform_data; |
181 | ||
182 | status = wait_for_completion_interruptible_timeout( | |
183 | &pin_infos->irq_detection, | |
184 | timeout); | |
185 | if (status > 0) | |
186 | enable_irq(gpio_to_irq(pin_infos->io_serirq)); | |
187 | gpio_direction_input(pin_infos->io_serirq); | |
188 | ||
189 | return status; | |
190 | } /* wait_for_interrupt_serirq_timeout() */ | |
191 | ||
3d7a7bd7 | 192 | static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition, |
251a7b08 ML |
193 | unsigned long timeout) |
194 | { | |
195 | int status = 2; | |
196 | struct i2c_client *client; | |
251a7b08 | 197 | |
2d089f82 | 198 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
199 | |
200 | status = _wait_for_interrupt_serirq_timeout(chip, timeout); | |
201 | if (!status) { | |
202 | status = -EBUSY; | |
2d089f82 | 203 | } else { |
251a7b08 ML |
204 | clear_interruption(client); |
205 | if (condition) | |
206 | status = 1; | |
207 | } | |
208 | return status; | |
209 | } | |
210 | ||
211 | /* | |
212 | * tpm_stm_i2c_cancel, cancel is not implemented. | |
213 | * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h | |
214 | */ | |
215 | static void tpm_stm_i2c_cancel(struct tpm_chip *chip) | |
216 | { | |
217 | struct i2c_client *client; | |
218 | u8 data; | |
219 | ||
2d089f82 | 220 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
221 | |
222 | data = TPM_STS_COMMAND_READY; | |
223 | I2C_WRITE_DATA(client, TPM_STS, &data, 1); | |
224 | if (chip->vendor.irq) | |
225 | wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a); | |
226 | } /* tpm_stm_i2c_cancel() */ | |
227 | ||
228 | /* | |
229 | * tpm_stm_spi_status return the TPM_STS register | |
230 | * @param: chip, the tpm chip description | |
231 | * @return: the TPM_STS register value. | |
232 | */ | |
233 | static u8 tpm_stm_i2c_status(struct tpm_chip *chip) | |
234 | { | |
235 | struct i2c_client *client; | |
236 | u8 data; | |
2d089f82 | 237 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
238 | |
239 | I2C_READ_DATA(client, TPM_STS, &data, 1); | |
240 | return data; | |
241 | } /* tpm_stm_i2c_status() */ | |
242 | ||
243 | ||
244 | /* | |
245 | * check_locality if the locality is active | |
246 | * @param: chip, the tpm chip description | |
247 | * @return: the active locality or -EACCESS. | |
248 | */ | |
249 | static int check_locality(struct tpm_chip *chip) | |
250 | { | |
251 | struct i2c_client *client; | |
252 | u8 data; | |
253 | u8 status; | |
254 | ||
2d089f82 | 255 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
256 | |
257 | status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1); | |
258 | if (status && (data & | |
259 | (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == | |
260 | (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) | |
261 | return chip->vendor.locality; | |
262 | ||
263 | return -EACCES; | |
264 | ||
265 | } /* check_locality() */ | |
266 | ||
267 | /* | |
268 | * request_locality request the TPM locality | |
269 | * @param: chip, the chip description | |
270 | * @return: the active locality or EACCESS. | |
271 | */ | |
272 | static int request_locality(struct tpm_chip *chip) | |
273 | { | |
274 | unsigned long stop; | |
275 | long rc; | |
276 | struct i2c_client *client; | |
277 | u8 data; | |
278 | ||
2d089f82 | 279 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
280 | |
281 | if (check_locality(chip) == chip->vendor.locality) | |
282 | return chip->vendor.locality; | |
283 | ||
284 | data = TPM_ACCESS_REQUEST_USE; | |
285 | rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1); | |
286 | if (rc < 0) | |
287 | goto end; | |
288 | ||
289 | if (chip->vendor.irq) { | |
290 | rc = wait_for_serirq_timeout(chip, (check_locality | |
291 | (chip) >= 0), | |
292 | chip->vendor.timeout_a); | |
293 | if (rc > 0) | |
294 | return chip->vendor.locality; | |
2d089f82 | 295 | } else { |
251a7b08 ML |
296 | stop = jiffies + chip->vendor.timeout_a; |
297 | do { | |
298 | if (check_locality(chip) >= 0) | |
299 | return chip->vendor.locality; | |
300 | msleep(TPM_TIMEOUT); | |
301 | } while (time_before(jiffies, stop)); | |
302 | } | |
303 | rc = -EACCES; | |
304 | end: | |
305 | return rc; | |
306 | } /* request_locality() */ | |
307 | ||
308 | /* | |
309 | * release_locality release the active locality | |
310 | * @param: chip, the tpm chip description. | |
311 | */ | |
312 | static void release_locality(struct tpm_chip *chip) | |
313 | { | |
314 | struct i2c_client *client; | |
315 | u8 data; | |
316 | ||
2d089f82 | 317 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
318 | data = TPM_ACCESS_ACTIVE_LOCALITY; |
319 | ||
320 | I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1); | |
321 | } | |
322 | ||
323 | /* | |
324 | * get_burstcount return the burstcount address 0x19 0x1A | |
325 | * @param: chip, the chip description | |
326 | * return: the burstcount. | |
327 | */ | |
328 | static int get_burstcount(struct tpm_chip *chip) | |
329 | { | |
330 | unsigned long stop; | |
331 | int burstcnt, status; | |
332 | u8 tpm_reg, temp; | |
333 | ||
2d089f82 | 334 | struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
335 | |
336 | stop = jiffies + chip->vendor.timeout_d; | |
337 | do { | |
338 | tpm_reg = TPM_STS + 1; | |
339 | status = I2C_READ_DATA(client, tpm_reg, &temp, 1); | |
340 | if (status < 0) | |
341 | goto end; | |
342 | ||
343 | tpm_reg = tpm_reg + 1; | |
344 | burstcnt = temp; | |
345 | status = I2C_READ_DATA(client, tpm_reg, &temp, 1); | |
346 | if (status < 0) | |
347 | goto end; | |
348 | ||
349 | burstcnt |= temp << 8; | |
350 | if (burstcnt) | |
351 | return burstcnt; | |
352 | msleep(TPM_TIMEOUT); | |
353 | } while (time_before(jiffies, stop)); | |
354 | ||
355 | end: | |
356 | return -EBUSY; | |
357 | } /* get_burstcount() */ | |
358 | ||
359 | /* | |
360 | * wait_for_stat wait for a TPM_STS value | |
361 | * @param: chip, the tpm chip description | |
362 | * @param: mask, the value mask to wait | |
363 | * @param: timeout, the timeout | |
364 | * @param: queue, the wait queue. | |
365 | * @return: the tpm status, 0 if success, -ETIME if timeout is reached. | |
366 | */ | |
367 | static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, | |
368 | wait_queue_head_t *queue) | |
369 | { | |
370 | unsigned long stop; | |
371 | long rc; | |
372 | u8 status; | |
373 | ||
374 | if (chip->vendor.irq) { | |
375 | rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status | |
376 | (chip) & mask) == | |
377 | mask), timeout); | |
378 | if (rc > 0) | |
379 | return 0; | |
2d089f82 | 380 | } else { |
251a7b08 ML |
381 | stop = jiffies + timeout; |
382 | do { | |
383 | msleep(TPM_TIMEOUT); | |
384 | status = tpm_stm_i2c_status(chip); | |
385 | if ((status & mask) == mask) | |
386 | return 0; | |
387 | } while (time_before(jiffies, stop)); | |
388 | } | |
389 | return -ETIME; | |
390 | } /* wait_for_stat() */ | |
391 | ||
392 | /* | |
393 | * recv_data receive data | |
394 | * @param: chip, the tpm chip description | |
395 | * @param: buf, the buffer where the data are received | |
396 | * @param: count, the number of data to receive | |
397 | * @return: the number of bytes read from TPM FIFO. | |
398 | */ | |
399 | static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) | |
400 | { | |
401 | int size = 0, burstcnt, len; | |
402 | struct i2c_client *client; | |
403 | ||
2d089f82 | 404 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
405 | |
406 | while (size < count && | |
407 | wait_for_stat(chip, | |
408 | TPM_STS_DATA_AVAIL | TPM_STS_VALID, | |
409 | chip->vendor.timeout_c, | |
410 | &chip->vendor.read_queue) | |
411 | == 0) { | |
412 | burstcnt = get_burstcount(chip); | |
413 | len = min_t(int, burstcnt, count - size); | |
414 | I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len); | |
415 | size += len; | |
416 | } | |
417 | return size; | |
418 | } | |
419 | ||
420 | /* | |
421 | * tpm_ioserirq_handler the serirq irq handler | |
422 | * @param: irq, the tpm chip description | |
423 | * @param: dev_id, the description of the chip | |
424 | * @return: the status of the handler. | |
425 | */ | |
426 | static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id) | |
427 | { | |
428 | struct tpm_chip *chip = dev_id; | |
429 | struct i2c_client *client; | |
430 | struct st33zp24_platform_data *pin_infos; | |
431 | ||
432 | disable_irq_nosync(irq); | |
433 | ||
2d089f82 | 434 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
435 | pin_infos = client->dev.platform_data; |
436 | ||
437 | complete(&pin_infos->irq_detection); | |
438 | return IRQ_HANDLED; | |
439 | } /* tpm_ioserirq_handler() */ | |
440 | ||
441 | ||
442 | /* | |
443 | * tpm_stm_i2c_send send TPM commands through the I2C bus. | |
444 | * | |
445 | * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h | |
446 | * @param: buf, the buffer to send. | |
447 | * @param: count, the number of bytes to send. | |
448 | * @return: In case of success the number of bytes sent. | |
449 | * In other case, a < 0 value describing the issue. | |
450 | */ | |
451 | static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf, | |
452 | size_t len) | |
453 | { | |
2d089f82 | 454 | u32 status, burstcnt = 0, i, size; |
3d7a7bd7 | 455 | int ret; |
251a7b08 ML |
456 | u8 data; |
457 | struct i2c_client *client; | |
251a7b08 ML |
458 | |
459 | if (chip == NULL) | |
460 | return -EBUSY; | |
461 | if (len < TPM_HEADER_SIZE) | |
462 | return -EBUSY; | |
463 | ||
3d7a7bd7 | 464 | client = (struct i2c_client *)TPM_VPRIV(chip); |
251a7b08 ML |
465 | |
466 | client->flags = 0; | |
467 | ||
468 | ret = request_locality(chip); | |
469 | if (ret < 0) | |
470 | return ret; | |
471 | ||
472 | status = tpm_stm_i2c_status(chip); | |
473 | if ((status & TPM_STS_COMMAND_READY) == 0) { | |
474 | tpm_stm_i2c_cancel(chip); | |
475 | if (wait_for_stat | |
476 | (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b, | |
477 | &chip->vendor.int_queue) < 0) { | |
478 | ret = -ETIME; | |
479 | goto out_err; | |
480 | } | |
481 | } | |
482 | ||
2d089f82 | 483 | for (i = 0; i < len - 1;) { |
251a7b08 ML |
484 | burstcnt = get_burstcount(chip); |
485 | size = min_t(int, len - i - 1, burstcnt); | |
486 | ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size); | |
487 | if (ret < 0) | |
488 | goto out_err; | |
489 | ||
490 | i += size; | |
491 | } | |
492 | ||
493 | status = tpm_stm_i2c_status(chip); | |
494 | if ((status & TPM_STS_DATA_EXPECT) == 0) { | |
495 | ret = -EIO; | |
496 | goto out_err; | |
497 | } | |
498 | ||
499 | ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1); | |
500 | if (ret < 0) | |
501 | goto out_err; | |
502 | ||
503 | status = tpm_stm_i2c_status(chip); | |
504 | if ((status & TPM_STS_DATA_EXPECT) != 0) { | |
505 | ret = -EIO; | |
506 | goto out_err; | |
507 | } | |
508 | ||
509 | data = TPM_STS_GO; | |
510 | I2C_WRITE_DATA(client, TPM_STS, &data, 1); | |
511 | ||
512 | return len; | |
513 | out_err: | |
514 | tpm_stm_i2c_cancel(chip); | |
515 | release_locality(chip); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | /* | |
520 | * tpm_stm_i2c_recv received TPM response through the I2C bus. | |
521 | * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h. | |
522 | * @param: buf, the buffer to store datas. | |
523 | * @param: count, the number of bytes to send. | |
524 | * @return: In case of success the number of bytes received. | |
525 | * In other case, a < 0 value describing the issue. | |
526 | */ | |
527 | static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf, | |
528 | size_t count) | |
529 | { | |
530 | int size = 0; | |
531 | int expected; | |
532 | ||
251a7b08 ML |
533 | if (chip == NULL) |
534 | return -EBUSY; | |
535 | ||
536 | if (count < TPM_HEADER_SIZE) { | |
537 | size = -EIO; | |
538 | goto out; | |
539 | } | |
540 | ||
541 | size = recv_data(chip, buf, TPM_HEADER_SIZE); | |
542 | if (size < TPM_HEADER_SIZE) { | |
543 | dev_err(chip->dev, "Unable to read header\n"); | |
544 | goto out; | |
545 | } | |
546 | ||
2d089f82 | 547 | expected = be32_to_cpu(*(__be32 *)(buf + 2)); |
251a7b08 ML |
548 | if (expected > count) { |
549 | size = -EIO; | |
550 | goto out; | |
551 | } | |
552 | ||
553 | size += recv_data(chip, &buf[TPM_HEADER_SIZE], | |
554 | expected - TPM_HEADER_SIZE); | |
555 | if (size < expected) { | |
556 | dev_err(chip->dev, "Unable to read remainder of result\n"); | |
557 | size = -ETIME; | |
558 | goto out; | |
559 | } | |
560 | ||
561 | out: | |
562 | chip->vendor.cancel(chip); | |
563 | release_locality(chip); | |
564 | return size; | |
565 | } | |
566 | ||
1f866057 SB |
567 | static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status) |
568 | { | |
2d089f82 | 569 | return (status == TPM_STS_COMMAND_READY); |
1f866057 SB |
570 | } |
571 | ||
251a7b08 ML |
572 | static const struct file_operations tpm_st33_i2c_fops = { |
573 | .owner = THIS_MODULE, | |
574 | .llseek = no_llseek, | |
575 | .read = tpm_read, | |
576 | .write = tpm_write, | |
577 | .open = tpm_open, | |
578 | .release = tpm_release, | |
579 | }; | |
580 | ||
581 | static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL); | |
582 | static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL); | |
583 | static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL); | |
584 | static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL); | |
585 | static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL); | |
586 | static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL); | |
e907481b | 587 | static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL); |
251a7b08 ML |
588 | static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); |
589 | ||
590 | static struct attribute *stm_tpm_attrs[] = { | |
591 | &dev_attr_pubek.attr, | |
592 | &dev_attr_pcrs.attr, | |
593 | &dev_attr_enabled.attr, | |
594 | &dev_attr_active.attr, | |
595 | &dev_attr_owned.attr, | |
596 | &dev_attr_temp_deactivated.attr, | |
597 | &dev_attr_caps.attr, | |
598 | &dev_attr_cancel.attr, NULL, | |
599 | }; | |
600 | ||
601 | static struct attribute_group stm_tpm_attr_grp = { | |
602 | .attrs = stm_tpm_attrs | |
603 | }; | |
604 | ||
605 | static struct tpm_vendor_specific st_i2c_tpm = { | |
606 | .send = tpm_stm_i2c_send, | |
607 | .recv = tpm_stm_i2c_recv, | |
608 | .cancel = tpm_stm_i2c_cancel, | |
609 | .status = tpm_stm_i2c_status, | |
610 | .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, | |
611 | .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, | |
1f866057 | 612 | .req_canceled = tpm_st33_i2c_req_canceled, |
251a7b08 ML |
613 | .attr_group = &stm_tpm_attr_grp, |
614 | .miscdev = {.fops = &tpm_st33_i2c_fops,}, | |
615 | }; | |
616 | ||
2d089f82 | 617 | static int interrupts; |
251a7b08 ML |
618 | module_param(interrupts, int, 0444); |
619 | MODULE_PARM_DESC(interrupts, "Enable interrupts"); | |
620 | ||
621 | static int power_mgt = 1; | |
622 | module_param(power_mgt, int, 0444); | |
623 | MODULE_PARM_DESC(power_mgt, "Power Management"); | |
624 | ||
625 | /* | |
626 | * tpm_st33_i2c_probe initialize the TPM device | |
627 | * @param: client, the i2c_client drescription (TPM I2C description). | |
628 | * @param: id, the i2c_device_id struct. | |
629 | * @return: 0 in case of success. | |
630 | * -1 in other case. | |
631 | */ | |
632 | static int | |
633 | tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
634 | { | |
3d7a7bd7 | 635 | int err; |
251a7b08 ML |
636 | u8 intmask; |
637 | struct tpm_chip *chip; | |
638 | struct st33zp24_platform_data *platform_data; | |
639 | ||
251a7b08 | 640 | if (client == NULL) { |
1fbc5e95 KY |
641 | pr_info("%s: i2c client is NULL. Device not accessible.\n", |
642 | __func__); | |
251a7b08 ML |
643 | err = -ENODEV; |
644 | goto end; | |
645 | } | |
646 | ||
647 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
648 | dev_info(&client->dev, "client not i2c capable\n"); | |
649 | err = -ENODEV; | |
650 | goto end; | |
651 | } | |
652 | ||
653 | chip = tpm_register_hardware(&client->dev, &st_i2c_tpm); | |
654 | if (!chip) { | |
655 | dev_info(&client->dev, "fail chip\n"); | |
656 | err = -ENODEV; | |
657 | goto end; | |
658 | } | |
659 | ||
660 | platform_data = client->dev.platform_data; | |
1fbc5e95 KY |
661 | |
662 | if (!platform_data) { | |
663 | dev_info(&client->dev, "chip not available\n"); | |
664 | err = -ENODEV; | |
665 | goto _tpm_clean_answer; | |
666 | } | |
667 | ||
251a7b08 ML |
668 | platform_data->tpm_i2c_buffer[0] = |
669 | kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
670 | if (platform_data->tpm_i2c_buffer[0] == NULL) { | |
671 | err = -ENOMEM; | |
672 | goto _tpm_clean_answer; | |
673 | } | |
674 | platform_data->tpm_i2c_buffer[1] = | |
675 | kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); | |
676 | if (platform_data->tpm_i2c_buffer[1] == NULL) { | |
677 | err = -ENOMEM; | |
3d7a7bd7 | 678 | goto _tpm_clean_response1; |
251a7b08 ML |
679 | } |
680 | ||
3d7a7bd7 | 681 | TPM_VPRIV(chip) = client; |
251a7b08 ML |
682 | |
683 | chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT); | |
684 | chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT); | |
685 | chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT); | |
686 | chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT); | |
687 | ||
688 | chip->vendor.locality = LOCALITY0; | |
689 | ||
690 | if (power_mgt) { | |
691 | err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD"); | |
692 | if (err) | |
693 | goto _gpio_init1; | |
694 | gpio_set_value(platform_data->io_lpcpd, 1); | |
695 | } | |
696 | ||
697 | if (interrupts) { | |
698 | init_completion(&platform_data->irq_detection); | |
699 | if (request_locality(chip) != LOCALITY0) { | |
700 | err = -ENODEV; | |
3d7a7bd7 | 701 | goto _tpm_clean_response2; |
251a7b08 ML |
702 | } |
703 | err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ"); | |
704 | if (err) | |
705 | goto _gpio_init2; | |
706 | ||
707 | clear_interruption(client); | |
708 | err = request_irq(gpio_to_irq(platform_data->io_serirq), | |
709 | &tpm_ioserirq_handler, | |
710 | IRQF_TRIGGER_HIGH, | |
711 | "TPM SERIRQ management", chip); | |
712 | if (err < 0) { | |
713 | dev_err(chip->dev , "TPM SERIRQ signals %d not available\n", | |
2d089f82 | 714 | gpio_to_irq(platform_data->io_serirq)); |
251a7b08 ML |
715 | goto _irq_set; |
716 | } | |
717 | ||
718 | err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1); | |
719 | if (err < 0) | |
720 | goto _irq_set; | |
721 | ||
722 | intmask |= TPM_INTF_CMD_READY_INT | |
723 | | TPM_INTF_FIFO_AVALAIBLE_INT | |
724 | | TPM_INTF_WAKE_UP_READY_INT | |
725 | | TPM_INTF_LOCALITY_CHANGE_INT | |
726 | | TPM_INTF_STS_VALID_INT | |
727 | | TPM_INTF_DATA_AVAIL_INT; | |
728 | ||
729 | err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1); | |
730 | if (err < 0) | |
731 | goto _irq_set; | |
732 | ||
733 | intmask = TPM_GLOBAL_INT_ENABLE; | |
734 | err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1); | |
735 | if (err < 0) | |
736 | goto _irq_set; | |
737 | ||
738 | err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1); | |
739 | if (err < 0) | |
740 | goto _irq_set; | |
741 | ||
742 | chip->vendor.irq = interrupts; | |
743 | ||
744 | tpm_gen_interrupt(chip); | |
745 | } | |
746 | ||
747 | tpm_get_timeouts(chip); | |
748 | ||
251a7b08 ML |
749 | dev_info(chip->dev, "TPM I2C Initialized\n"); |
750 | return 0; | |
751 | _irq_set: | |
2d089f82 | 752 | free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip); |
251a7b08 | 753 | _gpio_init2: |
3d7a7bd7 | 754 | if (interrupts) |
251a7b08 ML |
755 | gpio_free(platform_data->io_serirq); |
756 | _gpio_init1: | |
3d7a7bd7 | 757 | if (power_mgt) |
251a7b08 | 758 | gpio_free(platform_data->io_lpcpd); |
3d7a7bd7 KY |
759 | _tpm_clean_response2: |
760 | kzfree(platform_data->tpm_i2c_buffer[1]); | |
761 | platform_data->tpm_i2c_buffer[1] = NULL; | |
762 | _tpm_clean_response1: | |
763 | kzfree(platform_data->tpm_i2c_buffer[0]); | |
764 | platform_data->tpm_i2c_buffer[0] = NULL; | |
251a7b08 | 765 | _tpm_clean_answer: |
3d7a7bd7 | 766 | tpm_remove_hardware(chip->dev); |
251a7b08 ML |
767 | end: |
768 | pr_info("TPM I2C initialisation fail\n"); | |
769 | return err; | |
770 | } | |
771 | ||
772 | /* | |
773 | * tpm_st33_i2c_remove remove the TPM device | |
774 | * @param: client, the i2c_client drescription (TPM I2C description). | |
775 | clear_bit(0, &chip->is_open); | |
776 | * @return: 0 in case of success. | |
777 | */ | |
e02983cf | 778 | static int tpm_st33_i2c_remove(struct i2c_client *client) |
251a7b08 ML |
779 | { |
780 | struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client); | |
781 | struct st33zp24_platform_data *pin_infos = | |
2d089f82 | 782 | ((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data; |
251a7b08 ML |
783 | |
784 | if (pin_infos != NULL) { | |
785 | free_irq(pin_infos->io_serirq, chip); | |
786 | ||
787 | gpio_free(pin_infos->io_serirq); | |
788 | gpio_free(pin_infos->io_lpcpd); | |
789 | ||
1fbc5e95 KY |
790 | tpm_remove_hardware(chip->dev); |
791 | ||
251a7b08 ML |
792 | if (pin_infos->tpm_i2c_buffer[1] != NULL) { |
793 | kzfree(pin_infos->tpm_i2c_buffer[1]); | |
794 | pin_infos->tpm_i2c_buffer[1] = NULL; | |
795 | } | |
796 | if (pin_infos->tpm_i2c_buffer[0] != NULL) { | |
797 | kzfree(pin_infos->tpm_i2c_buffer[0]); | |
798 | pin_infos->tpm_i2c_buffer[0] = NULL; | |
799 | } | |
800 | } | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
d4593353 | 805 | #ifdef CONFIG_PM_SLEEP |
251a7b08 ML |
806 | /* |
807 | * tpm_st33_i2c_pm_suspend suspend the TPM device | |
251a7b08 ML |
808 | * @param: client, the i2c_client drescription (TPM I2C description). |
809 | * @param: mesg, the power management message. | |
810 | * @return: 0 in case of success. | |
811 | */ | |
d4593353 | 812 | static int tpm_st33_i2c_pm_suspend(struct device *dev) |
251a7b08 | 813 | { |
d4593353 | 814 | struct st33zp24_platform_data *pin_infos = dev->platform_data; |
251a7b08 ML |
815 | int ret = 0; |
816 | ||
2d089f82 | 817 | if (power_mgt) { |
251a7b08 | 818 | gpio_set_value(pin_infos->io_lpcpd, 0); |
2d089f82 | 819 | } else { |
d4593353 | 820 | ret = tpm_pm_suspend(dev); |
251a7b08 ML |
821 | } |
822 | return ret; | |
823 | } /* tpm_st33_i2c_suspend() */ | |
824 | ||
825 | /* | |
826 | * tpm_st33_i2c_pm_resume resume the TPM device | |
827 | * @param: client, the i2c_client drescription (TPM I2C description). | |
828 | * @return: 0 in case of success. | |
829 | */ | |
d4593353 | 830 | static int tpm_st33_i2c_pm_resume(struct device *dev) |
251a7b08 | 831 | { |
d4593353 PH |
832 | struct tpm_chip *chip = dev_get_drvdata(dev); |
833 | struct st33zp24_platform_data *pin_infos = dev->platform_data; | |
251a7b08 ML |
834 | |
835 | int ret = 0; | |
836 | ||
837 | if (power_mgt) { | |
838 | gpio_set_value(pin_infos->io_lpcpd, 1); | |
839 | ret = wait_for_serirq_timeout(chip, | |
3d7a7bd7 | 840 | (chip->vendor.status(chip) & |
251a7b08 ML |
841 | TPM_STS_VALID) == TPM_STS_VALID, |
842 | chip->vendor.timeout_b); | |
2d089f82 | 843 | } else { |
2d089f82 PH |
844 | ret = tpm_pm_resume(dev); |
845 | if (!ret) | |
846 | tpm_do_selftest(chip); | |
251a7b08 ML |
847 | } |
848 | return ret; | |
849 | } /* tpm_st33_i2c_pm_resume() */ | |
d4593353 | 850 | #endif |
251a7b08 ML |
851 | |
852 | static const struct i2c_device_id tpm_st33_i2c_id[] = { | |
853 | {TPM_ST33_I2C, 0}, | |
854 | {} | |
855 | }; | |
251a7b08 | 856 | MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id); |
2d089f82 PH |
857 | static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend, |
858 | tpm_st33_i2c_pm_resume); | |
251a7b08 ML |
859 | static struct i2c_driver tpm_st33_i2c_driver = { |
860 | .driver = { | |
861 | .owner = THIS_MODULE, | |
862 | .name = TPM_ST33_I2C, | |
d4593353 | 863 | .pm = &tpm_st33_i2c_ops, |
251a7b08 ML |
864 | }, |
865 | .probe = tpm_st33_i2c_probe, | |
866 | .remove = tpm_st33_i2c_remove, | |
251a7b08 ML |
867 | .id_table = tpm_st33_i2c_id |
868 | }; | |
869 | ||
3d7a7bd7 | 870 | module_i2c_driver(tpm_st33_i2c_driver); |
251a7b08 ML |
871 | |
872 | MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)"); | |
873 | MODULE_DESCRIPTION("STM TPM I2C ST33 Driver"); | |
874 | MODULE_VERSION("1.2.0"); | |
3d7a7bd7 | 875 | MODULE_LICENSE("GPL"); |