1  /******************************************************************************
2  * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501/NPCT6XX,
3  * based on the TCG TPM Interface Spec version 1.2.
4  * Specifications at www.trustedcomputinggroup.org
5  *
6  * Copyright (C) 2011, Nuvoton Technology Corporation.
7  *  Dan Morav <dan.morav@nuvoton.com>
8  * Copyright (C) 2013, Obsidian Research Corp.
9  *  Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
10  *
11  * This program is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program.  If not, see http://www.gnu.org/licenses/>.
23  *
24  * Nuvoton contact information: APC.Support@nuvoton.com
25  *****************************************************************************/
26 
27 #include <linux/init.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/wait.h>
33 #include <linux/i2c.h>
34 #include <linux/of_device.h>
35 #include "tpm.h"
36 
37 /* I2C interface offsets */
38 #define TPM_STS                0x00
39 #define TPM_BURST_COUNT        0x01
40 #define TPM_DATA_FIFO_W        0x20
41 #define TPM_DATA_FIFO_R        0x40
42 #define TPM_VID_DID_RID        0x60
43 /* TPM command header size */
44 #define TPM_HEADER_SIZE        10
45 #define TPM_RETRY      5
46 /*
47  * I2C bus device maximum buffer size w/o counting I2C address or command
48  * i.e. max size required for I2C write is 34 = addr, command, 32 bytes data
49  */
50 #define TPM_I2C_MAX_BUF_SIZE           32
51 #define TPM_I2C_RETRY_COUNT            32
52 #define TPM_I2C_BUS_DELAY              1000      	/* usec */
53 #define TPM_I2C_RETRY_DELAY_SHORT      (2 * 1000)	/* usec */
54 #define TPM_I2C_RETRY_DELAY_LONG       (10 * 1000) 	/* usec */
55 #define TPM_I2C_DELAY_RANGE            300		/* usec */
56 
57 #define OF_IS_TPM2 ((void *)1)
58 #define I2C_IS_TPM2 1
59 
60 struct priv_data {
61 	int irq;
62 	unsigned int intrs;
63 	wait_queue_head_t read_queue;
64 };
65 
66 static s32 i2c_nuvoton_read_buf(struct i2c_client *client, u8 offset, u8 size,
67 				u8 *data)
68 {
69 	s32 status;
70 
71 	status = i2c_smbus_read_i2c_block_data(client, offset, size, data);
72 	dev_dbg(&client->dev,
73 		"%s(offset=%u size=%u data=%*ph) -> sts=%d\n", __func__,
74 		offset, size, (int)size, data, status);
75 	return status;
76 }
77 
78 static s32 i2c_nuvoton_write_buf(struct i2c_client *client, u8 offset, u8 size,
79 				 u8 *data)
80 {
81 	s32 status;
82 
83 	status = i2c_smbus_write_i2c_block_data(client, offset, size, data);
84 	dev_dbg(&client->dev,
85 		"%s(offset=%u size=%u data=%*ph) -> sts=%d\n", __func__,
86 		offset, size, (int)size, data, status);
87 	return status;
88 }
89 
90 #define TPM_STS_VALID          0x80
91 #define TPM_STS_COMMAND_READY  0x40
92 #define TPM_STS_GO             0x20
93 #define TPM_STS_DATA_AVAIL     0x10
94 #define TPM_STS_EXPECT         0x08
95 #define TPM_STS_RESPONSE_RETRY 0x02
96 #define TPM_STS_ERR_VAL        0x07    /* bit2...bit0 reads always 0 */
97 
98 #define TPM_I2C_SHORT_TIMEOUT  750     /* ms */
99 #define TPM_I2C_LONG_TIMEOUT   2000    /* 2 sec */
100 
101 /* read TPM_STS register */
102 static u8 i2c_nuvoton_read_status(struct tpm_chip *chip)
103 {
104 	struct i2c_client *client = to_i2c_client(chip->dev.parent);
105 	s32 status;
106 	u8 data;
107 
108 	status = i2c_nuvoton_read_buf(client, TPM_STS, 1, &data);
109 	if (status <= 0) {
110 		dev_err(&chip->dev, "%s() error return %d\n", __func__,
111 			status);
112 		data = TPM_STS_ERR_VAL;
113 	}
114 
115 	return data;
116 }
117 
118 /* write byte to TPM_STS register */
119 static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data)
120 {
121 	s32 status;
122 	int i;
123 
124 	/* this causes the current command to be aborted */
125 	for (i = 0, status = -1; i < TPM_I2C_RETRY_COUNT && status < 0; i++) {
126 		status = i2c_nuvoton_write_buf(client, TPM_STS, 1, &data);
127 		if (status < 0)
128 			usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
129 				     + TPM_I2C_DELAY_RANGE);
130 	}
131 	return status;
132 }
133 
134 /* write commandReady to TPM_STS register */
135 static void i2c_nuvoton_ready(struct tpm_chip *chip)
136 {
137 	struct i2c_client *client = to_i2c_client(chip->dev.parent);
138 	s32 status;
139 
140 	/* this causes the current command to be aborted */
141 	status = i2c_nuvoton_write_status(client, TPM_STS_COMMAND_READY);
142 	if (status < 0)
143 		dev_err(&chip->dev,
144 			"%s() fail to write TPM_STS.commandReady\n", __func__);
145 }
146 
147 /* read burstCount field from TPM_STS register
148  * return -1 on fail to read */
149 static int i2c_nuvoton_get_burstcount(struct i2c_client *client,
150 				      struct tpm_chip *chip)
151 {
152 	unsigned long stop = jiffies + chip->timeout_d;
153 	s32 status;
154 	int burst_count = -1;
155 	u8 data;
156 
157 	/* wait for burstcount to be non-zero */
158 	do {
159 		/* in I2C burstCount is 1 byte */
160 		status = i2c_nuvoton_read_buf(client, TPM_BURST_COUNT, 1,
161 					      &data);
162 		if (status > 0 && data > 0) {
163 			burst_count = min_t(u8, TPM_I2C_MAX_BUF_SIZE, data);
164 			break;
165 		}
166 		usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
167 			     + TPM_I2C_DELAY_RANGE);
168 	} while (time_before(jiffies, stop));
169 
170 	return burst_count;
171 }
172 
173 /*
174  * WPCT301/NPCT501/NPCT6XX SINT# supports only dataAvail
175  * any call to this function which is not waiting for dataAvail will
176  * set queue to NULL to avoid waiting for interrupt
177  */
178 static bool i2c_nuvoton_check_status(struct tpm_chip *chip, u8 mask, u8 value)
179 {
180 	u8 status = i2c_nuvoton_read_status(chip);
181 	return (status != TPM_STS_ERR_VAL) && ((status & mask) == value);
182 }
183 
184 static int i2c_nuvoton_wait_for_stat(struct tpm_chip *chip, u8 mask, u8 value,
185 				     u32 timeout, wait_queue_head_t *queue)
186 {
187 	if ((chip->flags & TPM_CHIP_FLAG_IRQ) && queue) {
188 		s32 rc;
189 		struct priv_data *priv = dev_get_drvdata(&chip->dev);
190 		unsigned int cur_intrs = priv->intrs;
191 
192 		enable_irq(priv->irq);
193 		rc = wait_event_interruptible_timeout(*queue,
194 						      cur_intrs != priv->intrs,
195 						      timeout);
196 		if (rc > 0)
197 			return 0;
198 		/* At this point we know that the SINT pin is asserted, so we
199 		 * do not need to do i2c_nuvoton_check_status */
200 	} else {
201 		unsigned long ten_msec, stop;
202 		bool status_valid;
203 
204 		/* check current status */
205 		status_valid = i2c_nuvoton_check_status(chip, mask, value);
206 		if (status_valid)
207 			return 0;
208 
209 		/* use polling to wait for the event */
210 		ten_msec = jiffies + usecs_to_jiffies(TPM_I2C_RETRY_DELAY_LONG);
211 		stop = jiffies + timeout;
212 		do {
213 			if (time_before(jiffies, ten_msec))
214 				usleep_range(TPM_I2C_RETRY_DELAY_SHORT,
215 					     TPM_I2C_RETRY_DELAY_SHORT
216 					     + TPM_I2C_DELAY_RANGE);
217 			else
218 				usleep_range(TPM_I2C_RETRY_DELAY_LONG,
219 					     TPM_I2C_RETRY_DELAY_LONG
220 					     + TPM_I2C_DELAY_RANGE);
221 			status_valid = i2c_nuvoton_check_status(chip, mask,
222 								value);
223 			if (status_valid)
224 				return 0;
225 		} while (time_before(jiffies, stop));
226 	}
227 	dev_err(&chip->dev, "%s(%02x, %02x) -> timeout\n", __func__, mask,
228 		value);
229 	return -ETIMEDOUT;
230 }
231 
232 /* wait for dataAvail field to be set in the TPM_STS register */
233 static int i2c_nuvoton_wait_for_data_avail(struct tpm_chip *chip, u32 timeout,
234 					   wait_queue_head_t *queue)
235 {
236 	return i2c_nuvoton_wait_for_stat(chip,
237 					 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
238 					 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
239 					 timeout, queue);
240 }
241 
242 /* Read @count bytes into @buf from TPM_RD_FIFO register */
243 static int i2c_nuvoton_recv_data(struct i2c_client *client,
244 				 struct tpm_chip *chip, u8 *buf, size_t count)
245 {
246 	struct priv_data *priv = dev_get_drvdata(&chip->dev);
247 	s32 rc;
248 	int burst_count, bytes2read, size = 0;
249 
250 	while (size < count &&
251 	       i2c_nuvoton_wait_for_data_avail(chip,
252 					       chip->timeout_c,
253 					       &priv->read_queue) == 0) {
254 		burst_count = i2c_nuvoton_get_burstcount(client, chip);
255 		if (burst_count < 0) {
256 			dev_err(&chip->dev,
257 				"%s() fail to read burstCount=%d\n", __func__,
258 				burst_count);
259 			return -EIO;
260 		}
261 		bytes2read = min_t(size_t, burst_count, count - size);
262 		rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_R,
263 					  bytes2read, &buf[size]);
264 		if (rc < 0) {
265 			dev_err(&chip->dev,
266 				"%s() fail on i2c_nuvoton_read_buf()=%d\n",
267 				__func__, rc);
268 			return -EIO;
269 		}
270 		dev_dbg(&chip->dev, "%s(%d):", __func__, bytes2read);
271 		size += bytes2read;
272 	}
273 
274 	return size;
275 }
276 
277 /* Read TPM command results */
278 static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count)
279 {
280 	struct priv_data *priv = dev_get_drvdata(&chip->dev);
281 	struct device *dev = chip->dev.parent;
282 	struct i2c_client *client = to_i2c_client(dev);
283 	s32 rc;
284 	int status;
285 	int burst_count;
286 	int retries;
287 	int size = 0;
288 	u32 expected;
289 
290 	if (count < TPM_HEADER_SIZE) {
291 		i2c_nuvoton_ready(chip);    /* return to idle */
292 		dev_err(dev, "%s() count < header size\n", __func__);
293 		return -EIO;
294 	}
295 	for (retries = 0; retries < TPM_RETRY; retries++) {
296 		if (retries > 0) {
297 			/* if this is not the first trial, set responseRetry */
298 			i2c_nuvoton_write_status(client,
299 						 TPM_STS_RESPONSE_RETRY);
300 		}
301 		/*
302 		 * read first available (> 10 bytes), including:
303 		 * tag, paramsize, and result
304 		 */
305 		status = i2c_nuvoton_wait_for_data_avail(
306 			chip, chip->timeout_c, &priv->read_queue);
307 		if (status != 0) {
308 			dev_err(dev, "%s() timeout on dataAvail\n", __func__);
309 			size = -ETIMEDOUT;
310 			continue;
311 		}
312 		burst_count = i2c_nuvoton_get_burstcount(client, chip);
313 		if (burst_count < 0) {
314 			dev_err(dev, "%s() fail to get burstCount\n", __func__);
315 			size = -EIO;
316 			continue;
317 		}
318 		size = i2c_nuvoton_recv_data(client, chip, buf,
319 					     burst_count);
320 		if (size < TPM_HEADER_SIZE) {
321 			dev_err(dev, "%s() fail to read header\n", __func__);
322 			size = -EIO;
323 			continue;
324 		}
325 		/*
326 		 * convert number of expected bytes field from big endian 32 bit
327 		 * to machine native
328 		 */
329 		expected = be32_to_cpu(*(__be32 *) (buf + 2));
330 		if (expected > count || expected < size) {
331 			dev_err(dev, "%s() expected > count\n", __func__);
332 			size = -EIO;
333 			continue;
334 		}
335 		rc = i2c_nuvoton_recv_data(client, chip, &buf[size],
336 					   expected - size);
337 		size += rc;
338 		if (rc < 0 || size < expected) {
339 			dev_err(dev, "%s() fail to read remainder of result\n",
340 				__func__);
341 			size = -EIO;
342 			continue;
343 		}
344 		if (i2c_nuvoton_wait_for_stat(
345 			    chip, TPM_STS_VALID | TPM_STS_DATA_AVAIL,
346 			    TPM_STS_VALID, chip->timeout_c,
347 			    NULL)) {
348 			dev_err(dev, "%s() error left over data\n", __func__);
349 			size = -ETIMEDOUT;
350 			continue;
351 		}
352 		break;
353 	}
354 	i2c_nuvoton_ready(chip);
355 	dev_dbg(&chip->dev, "%s() -> %d\n", __func__, size);
356 	return size;
357 }
358 
359 /*
360  * Send TPM command.
361  *
362  * If interrupts are used (signaled by an irq set in the vendor structure)
363  * tpm.c can skip polling for the data to be available as the interrupt is
364  * waited for here
365  */
366 static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
367 {
368 	struct priv_data *priv = dev_get_drvdata(&chip->dev);
369 	struct device *dev = chip->dev.parent;
370 	struct i2c_client *client = to_i2c_client(dev);
371 	u32 ordinal;
372 	size_t count = 0;
373 	int burst_count, bytes2write, retries, rc = -EIO;
374 
375 	for (retries = 0; retries < TPM_RETRY; retries++) {
376 		i2c_nuvoton_ready(chip);
377 		if (i2c_nuvoton_wait_for_stat(chip, TPM_STS_COMMAND_READY,
378 					      TPM_STS_COMMAND_READY,
379 					      chip->timeout_b, NULL)) {
380 			dev_err(dev, "%s() timeout on commandReady\n",
381 				__func__);
382 			rc = -EIO;
383 			continue;
384 		}
385 		rc = 0;
386 		while (count < len - 1) {
387 			burst_count = i2c_nuvoton_get_burstcount(client,
388 								 chip);
389 			if (burst_count < 0) {
390 				dev_err(dev, "%s() fail get burstCount\n",
391 					__func__);
392 				rc = -EIO;
393 				break;
394 			}
395 			bytes2write = min_t(size_t, burst_count,
396 					    len - 1 - count);
397 			rc = i2c_nuvoton_write_buf(client, TPM_DATA_FIFO_W,
398 						   bytes2write, &buf[count]);
399 			if (rc < 0) {
400 				dev_err(dev, "%s() fail i2cWriteBuf\n",
401 					__func__);
402 				break;
403 			}
404 			dev_dbg(dev, "%s(%d):", __func__, bytes2write);
405 			count += bytes2write;
406 			rc = i2c_nuvoton_wait_for_stat(chip,
407 						       TPM_STS_VALID |
408 						       TPM_STS_EXPECT,
409 						       TPM_STS_VALID |
410 						       TPM_STS_EXPECT,
411 						       chip->timeout_c,
412 						       NULL);
413 			if (rc < 0) {
414 				dev_err(dev, "%s() timeout on Expect\n",
415 					__func__);
416 				rc = -ETIMEDOUT;
417 				break;
418 			}
419 		}
420 		if (rc < 0)
421 			continue;
422 
423 		/* write last byte */
424 		rc = i2c_nuvoton_write_buf(client, TPM_DATA_FIFO_W, 1,
425 					   &buf[count]);
426 		if (rc < 0) {
427 			dev_err(dev, "%s() fail to write last byte\n",
428 				__func__);
429 			rc = -EIO;
430 			continue;
431 		}
432 		dev_dbg(dev, "%s(last): %02x", __func__, buf[count]);
433 		rc = i2c_nuvoton_wait_for_stat(chip,
434 					       TPM_STS_VALID | TPM_STS_EXPECT,
435 					       TPM_STS_VALID,
436 					       chip->timeout_c, NULL);
437 		if (rc) {
438 			dev_err(dev, "%s() timeout on Expect to clear\n",
439 				__func__);
440 			rc = -ETIMEDOUT;
441 			continue;
442 		}
443 		break;
444 	}
445 	if (rc < 0) {
446 		/* retries == TPM_RETRY */
447 		i2c_nuvoton_ready(chip);
448 		return rc;
449 	}
450 	/* execute the TPM command */
451 	rc = i2c_nuvoton_write_status(client, TPM_STS_GO);
452 	if (rc < 0) {
453 		dev_err(dev, "%s() fail to write Go\n", __func__);
454 		i2c_nuvoton_ready(chip);
455 		return rc;
456 	}
457 	ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
458 	rc = i2c_nuvoton_wait_for_data_avail(chip,
459 					     tpm_calc_ordinal_duration(chip,
460 								       ordinal),
461 					     &priv->read_queue);
462 	if (rc) {
463 		dev_err(dev, "%s() timeout command duration\n", __func__);
464 		i2c_nuvoton_ready(chip);
465 		return rc;
466 	}
467 
468 	dev_dbg(dev, "%s() -> %zd\n", __func__, len);
469 	return len;
470 }
471 
472 static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status)
473 {
474 	return (status == TPM_STS_COMMAND_READY);
475 }
476 
477 static const struct tpm_class_ops tpm_i2c = {
478 	.flags = TPM_OPS_AUTO_STARTUP,
479 	.status = i2c_nuvoton_read_status,
480 	.recv = i2c_nuvoton_recv,
481 	.send = i2c_nuvoton_send,
482 	.cancel = i2c_nuvoton_ready,
483 	.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
484 	.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
485 	.req_canceled = i2c_nuvoton_req_canceled,
486 };
487 
488 /* The only purpose for the handler is to signal to any waiting threads that
489  * the interrupt is currently being asserted. The driver does not do any
490  * processing triggered by interrupts, and the chip provides no way to mask at
491  * the source (plus that would be slow over I2C). Run the IRQ as a one-shot,
492  * this means it cannot be shared. */
493 static irqreturn_t i2c_nuvoton_int_handler(int dummy, void *dev_id)
494 {
495 	struct tpm_chip *chip = dev_id;
496 	struct priv_data *priv = dev_get_drvdata(&chip->dev);
497 
498 	priv->intrs++;
499 	wake_up(&priv->read_queue);
500 	disable_irq_nosync(priv->irq);
501 	return IRQ_HANDLED;
502 }
503 
504 static int get_vid(struct i2c_client *client, u32 *res)
505 {
506 	static const u8 vid_did_rid_value[] = { 0x50, 0x10, 0xfe };
507 	u32 temp;
508 	s32 rc;
509 
510 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
511 		return -ENODEV;
512 	rc = i2c_nuvoton_read_buf(client, TPM_VID_DID_RID, 4, (u8 *)&temp);
513 	if (rc < 0)
514 		return rc;
515 
516 	/* check WPCT301 values - ignore RID */
517 	if (memcmp(&temp, vid_did_rid_value, sizeof(vid_did_rid_value))) {
518 		/*
519 		 * f/w rev 2.81 has an issue where the VID_DID_RID is not
520 		 * reporting the right value. so give it another chance at
521 		 * offset 0x20 (FIFO_W).
522 		 */
523 		rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_W, 4,
524 					  (u8 *) (&temp));
525 		if (rc < 0)
526 			return rc;
527 
528 		/* check WPCT301 values - ignore RID */
529 		if (memcmp(&temp, vid_did_rid_value,
530 			   sizeof(vid_did_rid_value)))
531 			return -ENODEV;
532 	}
533 
534 	*res = temp;
535 	return 0;
536 }
537 
538 static int i2c_nuvoton_probe(struct i2c_client *client,
539 			     const struct i2c_device_id *id)
540 {
541 	int rc;
542 	struct tpm_chip *chip;
543 	struct device *dev = &client->dev;
544 	struct priv_data *priv;
545 	u32 vid = 0;
546 
547 	rc = get_vid(client, &vid);
548 	if (rc)
549 		return rc;
550 
551 	dev_info(dev, "VID: %04X DID: %02X RID: %02X\n", (u16) vid,
552 		 (u8) (vid >> 16), (u8) (vid >> 24));
553 
554 	chip = tpmm_chip_alloc(dev, &tpm_i2c);
555 	if (IS_ERR(chip))
556 		return PTR_ERR(chip);
557 
558 	priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
559 	if (!priv)
560 		return -ENOMEM;
561 
562 	if (dev->of_node) {
563 		const struct of_device_id *of_id;
564 
565 		of_id = of_match_device(dev->driver->of_match_table, dev);
566 		if (of_id && of_id->data == OF_IS_TPM2)
567 			chip->flags |= TPM_CHIP_FLAG_TPM2;
568 	} else
569 		if (id->driver_data == I2C_IS_TPM2)
570 			chip->flags |= TPM_CHIP_FLAG_TPM2;
571 
572 	init_waitqueue_head(&priv->read_queue);
573 
574 	/* Default timeouts */
575 	chip->timeout_a = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT);
576 	chip->timeout_b = msecs_to_jiffies(TPM_I2C_LONG_TIMEOUT);
577 	chip->timeout_c = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT);
578 	chip->timeout_d = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT);
579 
580 	dev_set_drvdata(&chip->dev, priv);
581 
582 	/*
583 	 * I2C intfcaps (interrupt capabilitieis) in the chip are hard coded to:
584 	 *   TPM_INTF_INT_LEVEL_LOW | TPM_INTF_DATA_AVAIL_INT
585 	 * The IRQ should be set in the i2c_board_info (which is done
586 	 * automatically in of_i2c_register_devices, for device tree users */
587 	priv->irq = client->irq;
588 	if (client->irq) {
589 		dev_dbg(dev, "%s() priv->irq\n", __func__);
590 		rc = devm_request_irq(dev, client->irq,
591 				      i2c_nuvoton_int_handler,
592 				      IRQF_TRIGGER_LOW,
593 				      dev_name(&chip->dev),
594 				      chip);
595 		if (rc) {
596 			dev_err(dev, "%s() Unable to request irq: %d for use\n",
597 				__func__, priv->irq);
598 			priv->irq = 0;
599 		} else {
600 			chip->flags |= TPM_CHIP_FLAG_IRQ;
601 			/* Clear any pending interrupt */
602 			i2c_nuvoton_ready(chip);
603 			/* - wait for TPM_STS==0xA0 (stsValid, commandReady) */
604 			rc = i2c_nuvoton_wait_for_stat(chip,
605 						       TPM_STS_COMMAND_READY,
606 						       TPM_STS_COMMAND_READY,
607 						       chip->timeout_b,
608 						       NULL);
609 			if (rc == 0) {
610 				/*
611 				 * TIS is in ready state
612 				 * write dummy byte to enter reception state
613 				 * TPM_DATA_FIFO_W <- rc (0)
614 				 */
615 				rc = i2c_nuvoton_write_buf(client,
616 							   TPM_DATA_FIFO_W,
617 							   1, (u8 *) (&rc));
618 				if (rc < 0)
619 					return rc;
620 				/* TPM_STS <- 0x40 (commandReady) */
621 				i2c_nuvoton_ready(chip);
622 			} else {
623 				/*
624 				 * timeout_b reached - command was
625 				 * aborted. TIS should now be in idle state -
626 				 * only TPM_STS_VALID should be set
627 				 */
628 				if (i2c_nuvoton_read_status(chip) !=
629 				    TPM_STS_VALID)
630 					return -EIO;
631 			}
632 		}
633 	}
634 
635 	return tpm_chip_register(chip);
636 }
637 
638 static int i2c_nuvoton_remove(struct i2c_client *client)
639 {
640 	struct tpm_chip *chip = i2c_get_clientdata(client);
641 
642 	tpm_chip_unregister(chip);
643 	return 0;
644 }
645 
646 static const struct i2c_device_id i2c_nuvoton_id[] = {
647 	{"tpm_i2c_nuvoton"},
648 	{"tpm2_i2c_nuvoton", .driver_data = I2C_IS_TPM2},
649 	{}
650 };
651 MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id);
652 
653 #ifdef CONFIG_OF
654 static const struct of_device_id i2c_nuvoton_of_match[] = {
655 	{.compatible = "nuvoton,npct501"},
656 	{.compatible = "winbond,wpct301"},
657 	{.compatible = "nuvoton,npct601", .data = OF_IS_TPM2},
658 	{},
659 };
660 MODULE_DEVICE_TABLE(of, i2c_nuvoton_of_match);
661 #endif
662 
663 static SIMPLE_DEV_PM_OPS(i2c_nuvoton_pm_ops, tpm_pm_suspend, tpm_pm_resume);
664 
665 static struct i2c_driver i2c_nuvoton_driver = {
666 	.id_table = i2c_nuvoton_id,
667 	.probe = i2c_nuvoton_probe,
668 	.remove = i2c_nuvoton_remove,
669 	.driver = {
670 		.name = "tpm_i2c_nuvoton",
671 		.pm = &i2c_nuvoton_pm_ops,
672 		.of_match_table = of_match_ptr(i2c_nuvoton_of_match),
673 	},
674 };
675 
676 module_i2c_driver(i2c_nuvoton_driver);
677 
678 MODULE_AUTHOR("Dan Morav (dan.morav@nuvoton.com)");
679 MODULE_DESCRIPTION("Nuvoton TPM I2C Driver");
680 MODULE_LICENSE("GPL");
681