1 // SPDX-License-Identifier: GPL-2.0-or-later
4  * Copyright (C) 2009 - 2016 STMicroelectronics
71 	tpm_dev->ops->recv(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);  in clear_interruption()
72 	tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);  in clear_interruption()
81 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in st33zp24_cancel()
85 	tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);  in st33zp24_cancel()
93 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in st33zp24_status()
96 	tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS, &data, 1);  in st33zp24_status()
101  * if the locality is active
105 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in check_locality()
109 	status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_ACCESS, &data, 1);  in check_locality()
120 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in request_locality()
126 		return tpm_dev->locality;  in request_locality()
129 	ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);  in request_locality()
133 	stop = jiffies + chip->timeout_a;  in request_locality()
135 	/* Request locality is usually effective after the request */  in request_locality()
138 			return tpm_dev->locality;  in request_locality()
142 	/* could not get locality */  in request_locality()
143 	return -EACCES;  in request_locality()
148 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in release_locality()
153 	tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);  in release_locality()
161 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in get_burstcount()
166 	stop = jiffies + chip->timeout_d;  in get_burstcount()
168 		status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS + 1,  in get_burstcount()
171 			return -EBUSY;  in get_burstcount()
174 		status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS + 2,  in get_burstcount()
177 			return -EBUSY;  in get_burstcount()
184 	return -EBUSY;  in get_burstcount()
190 	u8 status = chip->ops->status(chip);  in wait_for_tpm_stat_cond()
195 	if (check_cancel && chip->ops->req_canceled(chip, status)) {  in wait_for_tpm_stat_cond()
208 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in wait_for_stat()
223 	if (chip->flags & TPM_CHIP_FLAG_IRQ) {  in wait_for_stat()
224 		cur_intrs = tpm_dev->intrs;  in wait_for_stat()
226 		enable_irq(tpm_dev->irq);  in wait_for_stat()
229 			if (ret == -ERESTARTSYS && freezing(current))  in wait_for_stat()
232 			timeout = stop - jiffies;  in wait_for_stat()
234 				return -1;  in wait_for_stat()
237 						cur_intrs != tpm_dev->intrs,  in wait_for_stat()
244 					return -ECANCELED;  in wait_for_stat()
247 		} while (ret == -ERESTARTSYS && freezing(current));  in wait_for_stat()
249 		disable_irq_nosync(tpm_dev->irq);  in wait_for_stat()
254 			status = chip->ops->status(chip);  in wait_for_stat()
260 	return -ETIME;  in wait_for_stat()
265 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in recv_data()
271 			     chip->timeout_c,  in recv_data()
272 			     &tpm_dev->read_queue, true) == 0) {  in recv_data()
276 		len = min_t(int, burstcnt, count - size);  in recv_data()
277 		ret = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_DATA_FIFO,  in recv_data()
290 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in tpm_ioserirq_handler()
292 	tpm_dev->intrs++;  in tpm_ioserirq_handler()
293 	wake_up_interruptible(&tpm_dev->read_queue);  in tpm_ioserirq_handler()
294 	disable_irq_nosync(tpm_dev->irq);  in tpm_ioserirq_handler()
305 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in st33zp24_send()
312 		return -EBUSY;  in st33zp24_send()
322 		    (chip, TPM_STS_COMMAND_READY, chip->timeout_b,  in st33zp24_send()
323 		     &tpm_dev->read_queue, false) < 0) {  in st33zp24_send()
324 			ret = -ETIME;  in st33zp24_send()
329 	for (i = 0; i < len - 1;) {  in st33zp24_send()
333 		size = min_t(int, len - i - 1, burstcnt);  in st33zp24_send()
334 		ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,  in st33zp24_send()
344 		ret = -EIO;  in st33zp24_send()
348 	ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,  in st33zp24_send()
349 				 buf + len - 1, 1);  in st33zp24_send()
355 		ret = -EIO;  in st33zp24_send()
360 	ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);  in st33zp24_send()
364 	if (chip->flags & TPM_CHIP_FLAG_IRQ) {  in st33zp24_send()
369 				&tpm_dev->read_queue, false);  in st33zp24_send()
388 		return -EBUSY;  in st33zp24_recv()
391 		size = -EIO;  in st33zp24_recv()
397 		dev_err(&chip->dev, "Unable to read header\n");  in st33zp24_recv()
403 		size = -EIO;  in st33zp24_recv()
408 			expected - TPM_HEADER_SIZE);  in st33zp24_recv()
410 		dev_err(&chip->dev, "Unable to read remainder of result\n");  in st33zp24_recv()
411 		size = -ETIME;  in st33zp24_recv()
439 	{ "lpcpd-gpios", &lpcpd_gpios, 1 },
461 		return -ENOMEM;  in st33zp24_probe()
463 	tpm_dev->phy_id = phy_id;  in st33zp24_probe()
464 	tpm_dev->ops = ops;  in st33zp24_probe()
465 	dev_set_drvdata(&chip->dev, tpm_dev);  in st33zp24_probe()
467 	chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);  in st33zp24_probe()
468 	chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);  in st33zp24_probe()
469 	chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);  in st33zp24_probe()
470 	chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);  in st33zp24_probe()
472 	tpm_dev->locality = LOCALITY0;  in st33zp24_probe()
482 	 * issue as power management can be also managed by TPM specific  in st33zp24_probe()
485 	tpm_dev->io_lpcpd = devm_gpiod_get_optional(dev, "lpcpd",  in st33zp24_probe()
487 	ret = PTR_ERR_OR_ZERO(tpm_dev->io_lpcpd);  in st33zp24_probe()
495 		init_waitqueue_head(&tpm_dev->read_queue);  in st33zp24_probe()
496 		tpm_dev->intrs = 0;  in st33zp24_probe()
499 			ret = -ENODEV;  in st33zp24_probe()
508 			dev_err(&chip->dev, "TPM SERIRQ signals %d not available\n",  in st33zp24_probe()
517 		ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_ENABLE,  in st33zp24_probe()
523 		ret = tpm_dev->ops->send(tpm_dev->phy_id, (TPM_INT_ENABLE + 3),  in st33zp24_probe()
528 		tpm_dev->irq = irq;  in st33zp24_probe()
529 		chip->flags |= TPM_CHIP_FLAG_IRQ;  in st33zp24_probe()
531 		disable_irq_nosync(tpm_dev->irq);  in st33zp24_probe()
536 	dev_info(&chip->dev, "TPM initialization fail\n");  in st33zp24_probe()
551 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in st33zp24_pm_suspend()
555 	if (tpm_dev->io_lpcpd)  in st33zp24_pm_suspend()
556 		gpiod_set_value_cansleep(tpm_dev->io_lpcpd, 0);  in st33zp24_pm_suspend()
567 	struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);  in st33zp24_pm_resume()
570 	if (tpm_dev->io_lpcpd) {  in st33zp24_pm_resume()
571 		gpiod_set_value_cansleep(tpm_dev->io_lpcpd, 1);  in st33zp24_pm_resume()
573 				TPM_STS_VALID, chip->timeout_b,  in st33zp24_pm_resume()
574 				&tpm_dev->read_queue, false);  in st33zp24_pm_resume()