[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / tpm / tpm_atmel.c

/*
 * Copyright (C) 2004 IBM Corporation
 *
 * Authors:
 * Leendert van Doorn <leendert@watson.ibm.com>
 * Dave Safford <safford@watson.ibm.com>
 * Reiner Sailer <sailer@watson.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org	 
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 * 
 */

#include "tpm.h"
#include "tpm_atmel.h"

/* write status bits */
enum tpm_atmel_write_status {
	ATML_STATUS_ABORT = 0x01,
	ATML_STATUS_LASTBYTE = 0x04
};
/* read status bits */
enum tpm_atmel_read_status {
	ATML_STATUS_BUSY = 0x01,
	ATML_STATUS_DATA_AVAIL = 0x02,
	ATML_STATUS_REWRITE = 0x04,
	ATML_STATUS_READY = 0x08
};

static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
	u8 status, *hdr = buf;
	u32 size;
	int i;
	__be32 *native_size;

	/* start reading header */
	if (count < 6)
		return -EIO;

	for (i = 0; i < 6; i++) {
		status = ioread8(chip->vendor.iobase + 1);
		if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
			dev_err(chip->dev, "error reading header\n");
			return -EIO;
		}
		*buf++ = ioread8(chip->vendor.iobase);
	}

	/* size of the data received */
	native_size = (__force __be32 *) (hdr + 2);
	size = be32_to_cpu(*native_size);

	if (count < size) {
		dev_err(chip->dev,
			"Recv size(%d) less than available space\n", size);
		for (; i < size; i++) {	/* clear the waiting data anyway */
			status = ioread8(chip->vendor.iobase + 1);
			if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
				dev_err(chip->dev, "error reading data\n");
				return -EIO;
			}
		}
		return -EIO;
	}

	/* read all the data available */
	for (; i < size; i++) {
		status = ioread8(chip->vendor.iobase + 1);
		if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
			dev_err(chip->dev, "error reading data\n");
			return -EIO;
		}
		*buf++ = ioread8(chip->vendor.iobase);
	}

	/* make sure data available is gone */
	status = ioread8(chip->vendor.iobase + 1);

	if (status & ATML_STATUS_DATA_AVAIL) {
		dev_err(chip->dev, "data available is stuck\n");
		return -EIO;
	}

	return size;
}

static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count)
{
	int i;

	dev_dbg(chip->dev, "tpm_atml_send:\n");
	for (i = 0; i < count; i++) {
		dev_dbg(chip->dev, "%d 0x%x(%d)\n",  i, buf[i], buf[i]);
 		iowrite8(buf[i], chip->vendor.iobase);
	}

	return count;
}

static void tpm_atml_cancel(struct tpm_chip *chip)
{
	iowrite8(ATML_STATUS_ABORT, chip->vendor.iobase + 1);
}

static u8 tpm_atml_status(struct tpm_chip *chip)
{
	return ioread8(chip->vendor.iobase + 1);
}

static bool tpm_atml_req_canceled(struct tpm_chip *chip, u8 status)
{
	return (status == ATML_STATUS_READY);
}

static const struct file_operations atmel_ops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.open = tpm_open,
	.read = tpm_read,
	.write = tpm_write,
	.release = tpm_release,
};

static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
static DEVICE_ATTR(cancel, S_IWUSR |S_IWGRP, NULL, tpm_store_cancel);

static struct attribute* atmel_attrs[] = {
	&dev_attr_pubek.attr,
	&dev_attr_pcrs.attr,
	&dev_attr_caps.attr,
	&dev_attr_cancel.attr,
	NULL,
};

static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };

static const struct tpm_vendor_specific tpm_atmel = {
	.recv = tpm_atml_recv,
	.send = tpm_atml_send,
	.cancel = tpm_atml_cancel,
	.status = tpm_atml_status,
	.req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
	.req_complete_val = ATML_STATUS_DATA_AVAIL,
	.req_canceled = tpm_atml_req_canceled,
	.attr_group = &atmel_attr_grp,
	.miscdev = { .fops = &atmel_ops, },
};

static struct platform_device *pdev;

static void atml_plat_remove(void)
{
	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);

	if (chip) {
		if (chip->vendor.have_region)
			atmel_release_region(chip->vendor.base,
					     chip->vendor.region_size);
		atmel_put_base_addr(chip->vendor.iobase);
		tpm_remove_hardware(chip->dev);
		platform_device_unregister(pdev);
	}
}

static SIMPLE_DEV_PM_OPS(tpm_atml_pm, tpm_pm_suspend, tpm_pm_resume);

static struct platform_driver atml_drv = {
	.driver = {
		.name = "tpm_atmel",
		.owner		= THIS_MODULE,
		.pm		= &tpm_atml_pm,
	},
};

static int __init init_atmel(void)
{
	int rc = 0;
	void __iomem *iobase = NULL;
	int have_region, region_size;
	unsigned long base;
	struct  tpm_chip *chip;

	rc = platform_driver_register(&atml_drv);
	if (rc)
		return rc;

	if ((iobase = atmel_get_base_addr(&base, &region_size)) == NULL) {
		rc = -ENODEV;
		goto err_unreg_drv;
	}

	have_region =
	    (atmel_request_region
	     (tpm_atmel.base, region_size, "tpm_atmel0") == NULL) ? 0 : 1;

	pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0);
	if (IS_ERR(pdev)) {
		rc = PTR_ERR(pdev);
		goto err_rel_reg;
	}

	if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_atmel))) {
		rc = -ENODEV;
		goto err_unreg_dev;
	}

	chip->vendor.iobase = iobase;
	chip->vendor.base = base;
	chip->vendor.have_region = have_region;
	chip->vendor.region_size = region_size;

	return 0;

err_unreg_dev:
	platform_device_unregister(pdev);
err_rel_reg:
	atmel_put_base_addr(iobase);
	if (have_region)
		atmel_release_region(base,
				     region_size);
err_unreg_drv:
	platform_driver_unregister(&atml_drv);
	return rc;
}

static void __exit cleanup_atmel(void)
{
	platform_driver_unregister(&atml_drv);
	atml_plat_remove();
}

module_init(init_atmel);
module_exit(cleanup_atmel);

MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
MODULE_DESCRIPTION("TPM Driver");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2004 IBM Corporation
	3	*
	4	* Authors:
	5	* Leendert van Doorn <leendert@watson.ibm.com>
	6	* Dave Safford <safford@watson.ibm.com>
	7	* Reiner Sailer <sailer@watson.ibm.com>
	8	* Kylene Hall <kjhall@us.ibm.com>
	9	*
8e81cc13	10	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
1da177e4 LT	11	*
	12	* Device driver for TCG/TCPA TPM (trusted platform module).
	13	* Specifications at www.trustedcomputinggroup.org
	14	*
	15	* This program is free software; you can redistribute it and/or
	16	* modify it under the terms of the GNU General Public License as
	17	* published by the Free Software Foundation, version 2 of the
	18	* License.
	19	*
	20	*/
	21
	22	#include "tpm.h"
ad5ea3cc	23	#include "tpm_atmel.h"
1da177e4 LT	24
1da177e4 LT	25	/* write status bits */
3122a88a KH	26	enum tpm_atmel_write_status {
	27	ATML_STATUS_ABORT = 0x01,
	28	ATML_STATUS_LASTBYTE = 0x04
	29	};
1da177e4	30	/* read status bits */
3122a88a KH	31	enum tpm_atmel_read_status {
	32	ATML_STATUS_BUSY = 0x01,
	33	ATML_STATUS_DATA_AVAIL = 0x02,
	34	ATML_STATUS_REWRITE = 0x04,
	35	ATML_STATUS_READY = 0x08
	36	};
1da177e4	37
b888c87b	38	static int tpm_atml_recv(struct tpm_chip chip, u8 buf, size_t count)
1da177e4 LT	39	{
	40	u8 status, *hdr = buf;
	41	u32 size;
	42	int i;
	43	__be32 *native_size;
	44
	45	/* start reading header */
	46	if (count < 6)
	47	return -EIO;
	48
	49	for (i = 0; i < 6; i++) {
90dda520	50	status = ioread8(chip->vendor.iobase + 1);
1da177e4	51	if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
90612b30	52	dev_err(chip->dev, "error reading header\n");
1da177e4 LT	53	return -EIO;
1da177e4 LT	54	}
90dda520	55	*buf++ = ioread8(chip->vendor.iobase);
1da177e4 LT	56	}
	57
	58	/* size of the data received */
	59	native_size = (__force __be32 *) (hdr + 2);
	60	size = be32_to_cpu(*native_size);
	61
	62	if (count < size) {
e659a3fe	63	dev_err(chip->dev,
1da177e4 LT	64	"Recv size(%d) less than available space\n", size);
1da177e4 LT	65	for (; i < size; i++) { /* clear the waiting data anyway */
90dda520	66	status = ioread8(chip->vendor.iobase + 1);
1da177e4	67	if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
90612b30	68	dev_err(chip->dev, "error reading data\n");
1da177e4 LT	69	return -EIO;
	70	}
	71	}
	72	return -EIO;
	73	}
	74
	75	/* read all the data available */
	76	for (; i < size; i++) {
90dda520	77	status = ioread8(chip->vendor.iobase + 1);
1da177e4	78	if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
90612b30	79	dev_err(chip->dev, "error reading data\n");
1da177e4 LT	80	return -EIO;
1da177e4 LT	81	}
90dda520	82	*buf++ = ioread8(chip->vendor.iobase);
1da177e4 LT	83	}
	84
	85	/* make sure data available is gone */
90dda520	86	status = ioread8(chip->vendor.iobase + 1);
90612b30	87
1da177e4	88	if (status & ATML_STATUS_DATA_AVAIL) {
e659a3fe	89	dev_err(chip->dev, "data available is stuck\n");
1da177e4 LT	90	return -EIO;
	91	}
	92
	93	return size;
	94	}
	95
b888c87b	96	static int tpm_atml_send(struct tpm_chip chip, u8 buf, size_t count)
1da177e4 LT	97	{
	98	int i;
	99
e659a3fe	100	dev_dbg(chip->dev, "tpm_atml_send:\n");
1da177e4	101	for (i = 0; i < count; i++) {
e659a3fe	102	dev_dbg(chip->dev, "%d 0x%x(%d)\n", i, buf[i], buf[i]);
90dda520	103	iowrite8(buf[i], chip->vendor.iobase);
1da177e4 LT	104	}
	105
	106	return count;
	107	}
	108
	109	static void tpm_atml_cancel(struct tpm_chip *chip)
	110	{
90dda520	111	iowrite8(ATML_STATUS_ABORT, chip->vendor.iobase + 1);
1da177e4 LT	112	}
1da177e4 LT	113
b4ed3e3c KJH	114	static u8 tpm_atml_status(struct tpm_chip *chip)
b4ed3e3c KJH	115	{
90dda520	116	return ioread8(chip->vendor.iobase + 1);
b4ed3e3c KJH	117	}
b4ed3e3c KJH	118
1f866057 SB	119	static bool tpm_atml_req_canceled(struct tpm_chip *chip, u8 status)
	120	{
	121	return (status == ATML_STATUS_READY);
	122	}
	123
62322d25	124	static const struct file_operations atmel_ops = {
1da177e4 LT	125	.owner = THIS_MODULE,
	126	.llseek = no_llseek,
	127	.open = tpm_open,
	128	.read = tpm_read,
	129	.write = tpm_write,
	130	.release = tpm_release,
	131	};
	132
6659ca2a KH	133	static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
	134	static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
	135	static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
	136	static DEVICE_ATTR(cancel, S_IWUSR \|S_IWGRP, NULL, tpm_store_cancel);
	137
	138	static struct attribute* atmel_attrs[] = {
	139	&dev_attr_pubek.attr,
	140	&dev_attr_pcrs.attr,
	141	&dev_attr_caps.attr,
	142	&dev_attr_cancel.attr,
874ec33f	143	NULL,
6659ca2a KH	144	};
	145
	146	static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };
	147
e0dd03ca	148	static const struct tpm_vendor_specific tpm_atmel = {
1da177e4 LT	149	.recv = tpm_atml_recv,
	150	.send = tpm_atml_send,
	151	.cancel = tpm_atml_cancel,
b4ed3e3c	152	.status = tpm_atml_status,
1da177e4 LT	153	.req_complete_mask = ATML_STATUS_BUSY \| ATML_STATUS_DATA_AVAIL,
1da177e4 LT	154	.req_complete_val = ATML_STATUS_DATA_AVAIL,
1f866057	155	.req_canceled = tpm_atml_req_canceled,
6659ca2a	156	.attr_group = &atmel_attr_grp,
1da177e4 LT	157	.miscdev = { .fops = &atmel_ops, },
	158	};
	159
b888c87b	160	static struct platform_device *pdev;
682e97ac	161
ad5ea3cc	162	static void atml_plat_remove(void)
682e97ac	163	{
ad5ea3cc KJH	164	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
ad5ea3cc KJH	165
b888c87b	166	if (chip) {
90dda520 KJH	167	if (chip->vendor.have_region)
	168	atmel_release_region(chip->vendor.base,
	169	chip->vendor.region_size);
	170	atmel_put_base_addr(chip->vendor.iobase);
682e97ac	171	tpm_remove_hardware(chip->dev);
ad5ea3cc	172	platform_device_unregister(pdev);
682e97ac KJH	173	}
	174	}
	175
8324be05	176	static SIMPLE_DEV_PM_OPS(tpm_atml_pm, tpm_pm_suspend, tpm_pm_resume);
7a192ec3	177
7a192ec3 ML	178	static struct platform_driver atml_drv = {
	179	.driver = {
	180	.name = "tpm_atmel",
	181	.owner = THIS_MODULE,
8324be05	182	.pm = &tpm_atml_pm,
7a192ec3	183	},
682e97ac KJH	184	};
	185
	186	static int __init init_atmel(void)
1da177e4	187	{
1da177e4	188	int rc = 0;
e0dd03ca KJH	189	void __iomem *iobase = NULL;
	190	int have_region, region_size;
	191	unsigned long base;
	192	struct tpm_chip *chip;
1da177e4	193
7a192ec3	194	rc = platform_driver_register(&atml_drv);
f33d9bd5 JG	195	if (rc)
f33d9bd5 JG	196	return rc;
1da177e4	197
e0dd03ca	198	if ((iobase = atmel_get_base_addr(&base, &region_size)) == NULL) {
ad5ea3cc KJH	199	rc = -ENODEV;
ad5ea3cc KJH	200	goto err_unreg_drv;
682e97ac	201	}
1da177e4	202
e0dd03ca	203	have_region =
90612b30	204	(atmel_request_region
e0dd03ca KJH	205	(tpm_atmel.base, region_size, "tpm_atmel0") == NULL) ? 0 : 1;
e0dd03ca KJH	206
f33d9bd5 JG	207	pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0);
f33d9bd5 JG	208	if (IS_ERR(pdev)) {
ad5ea3cc KJH	209	rc = PTR_ERR(pdev);
ad5ea3cc KJH	210	goto err_rel_reg;
682e97ac	211	}
1da177e4	212
e0dd03ca KJH	213	if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_atmel))) {
e0dd03ca KJH	214	rc = -ENODEV;
ad5ea3cc	215	goto err_unreg_dev;
e0dd03ca KJH	216	}
	217
	218	chip->vendor.iobase = iobase;
	219	chip->vendor.base = base;
	220	chip->vendor.have_region = have_region;
	221	chip->vendor.region_size = region_size;
	222
682e97ac	223	return 0;
ad5ea3cc KJH	224
	225	err_unreg_dev:
	226	platform_device_unregister(pdev);
	227	err_rel_reg:
e0dd03ca KJH	228	atmel_put_base_addr(iobase);
	229	if (have_region)
	230	atmel_release_region(base,
	231	region_size);
ad5ea3cc	232	err_unreg_drv:
7a192ec3	233	platform_driver_unregister(&atml_drv);
ad5ea3cc	234	return rc;
1da177e4 LT	235	}
	236
	237	static void __exit cleanup_atmel(void)
	238	{
7a192ec3	239	platform_driver_unregister(&atml_drv);
ad5ea3cc	240	atml_plat_remove();
1da177e4 LT	241	}
	242
	243	module_init(init_atmel);
	244	module_exit(cleanup_atmel);
	245
	246	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	247	MODULE_DESCRIPTION("TPM Driver");
	248	MODULE_VERSION("2.0");
	249	MODULE_LICENSE("GPL");