[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"

/* Atmel definitions */
enum tpm_atmel_addr {
	TPM_ATMEL_BASE_ADDR_LO = 0x08,
	TPM_ATMEL_BASE_ADDR_HI = 0x09
};

/* 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 = inb(chip->vendor->base + 1);
		if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
			dev_err(&chip->pci_dev->dev,
				"error reading header\n");
			return -EIO;
		}
		*buf++ = inb(chip->vendor->base);
	}

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

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

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

	/* make sure data available is gone */
	status = inb(chip->vendor->base + 1);
	if (status & ATML_STATUS_DATA_AVAIL) {
		dev_err(&chip->pci_dev->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->pci_dev->dev, "tpm_atml_send: ");
	for (i = 0; i < count; i++) {
		dev_dbg(&chip->pci_dev->dev, "0x%x(%d) ", buf[i], buf[i]);
		outb(buf[i], chip->vendor->base);
	}

	return count;
}

static void tpm_atml_cancel(struct tpm_chip *chip)
{
	outb(ATML_STATUS_ABORT, chip->vendor->base + 1);
}

static u8 tpm_atml_status(struct tpm_chip *chip)
{
	return inb(chip->vendor->base + 1);
}

static 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,
	0,
};

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

static 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 = ATML_STATUS_READY,
	.attr_group = &atmel_attr_grp,
	.miscdev = { .fops = &atmel_ops, },
};

static int __devinit tpm_atml_init(struct pci_dev *pci_dev,
				   const struct pci_device_id *pci_id)
{
	u8 version[4];
	int rc = 0;
	int lo, hi;

	if (pci_enable_device(pci_dev))
		return -EIO;

	lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
	hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);

	tpm_atmel.base = (hi<<8)|lo;
	dev_dbg( &pci_dev->dev, "Operating with base: 0x%x\n", tpm_atmel.base);

	/* verify that it is an Atmel part */
	if (tpm_read_index(TPM_ADDR, 4) != 'A' || tpm_read_index(TPM_ADDR, 5) != 'T'
	    || tpm_read_index(TPM_ADDR, 6) != 'M' || tpm_read_index(TPM_ADDR, 7) != 'L') {
		rc = -ENODEV;
		goto out_err;
	}

	/* query chip for its version number */
	if ((version[0] = tpm_read_index(TPM_ADDR, 0x00)) != 0xFF) {
		version[1] = tpm_read_index(TPM_ADDR, 0x01);
		version[2] = tpm_read_index(TPM_ADDR, 0x02);
		version[3] = tpm_read_index(TPM_ADDR, 0x03);
	} else {
		dev_info(&pci_dev->dev, "version query failed\n");
		rc = -ENODEV;
		goto out_err;
	}

	if ((rc = tpm_register_hardware(pci_dev, &tpm_atmel)) < 0)
		goto out_err;

	dev_info(&pci_dev->dev,
		 "Atmel TPM version %d.%d.%d.%d\n", version[0], version[1],
		 version[2], version[3]);

	return 0;
out_err:
	pci_disable_device(pci_dev);
	return rc;
}

static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
	{PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6LPC)},
	{0,}
};

MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);

static struct pci_driver atmel_pci_driver = {
	.name = "tpm_atmel",
	.id_table = tpm_pci_tbl,
	.probe = tpm_atml_init,
	.remove = __devexit_p(tpm_remove),
	.suspend = tpm_pm_suspend,
	.resume = tpm_pm_resume,
};

static int __init init_atmel(void)
{
	return pci_register_driver(&atmel_pci_driver);
}

static void __exit cleanup_atmel(void)
{
	pci_unregister_driver(&atmel_pci_driver);
}

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	*
	10	* Maintained by: <tpmdd_devel@lists.sourceforge.net>
	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"
	23
	24	/* Atmel definitions */
e1a23c66 KH	25	enum tpm_atmel_addr {
	26	TPM_ATMEL_BASE_ADDR_LO = 0x08,
	27	TPM_ATMEL_BASE_ADDR_HI = 0x09
3122a88a	28	};
1da177e4 LT	29
1da177e4 LT	30	/* write status bits */
3122a88a KH	31	enum tpm_atmel_write_status {
	32	ATML_STATUS_ABORT = 0x01,
	33	ATML_STATUS_LASTBYTE = 0x04
	34	};
1da177e4	35	/* read status bits */
3122a88a KH	36	enum tpm_atmel_read_status {
	37	ATML_STATUS_BUSY = 0x01,
	38	ATML_STATUS_DATA_AVAIL = 0x02,
	39	ATML_STATUS_REWRITE = 0x04,
	40	ATML_STATUS_READY = 0x08
	41	};
1da177e4 LT	42
	43	static int tpm_atml_recv(struct tpm_chip chip, u8 buf, size_t count)
	44	{
	45	u8 status, *hdr = buf;
	46	u32 size;
	47	int i;
	48	__be32 *native_size;
	49
	50	/* start reading header */
	51	if (count < 6)
	52	return -EIO;
	53
	54	for (i = 0; i < 6; i++) {
	55	status = inb(chip->vendor->base + 1);
	56	if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
	57	dev_err(&chip->pci_dev->dev,
	58	"error reading header\n");
	59	return -EIO;
	60	}
	61	*buf++ = inb(chip->vendor->base);
	62	}
	63
	64	/* size of the data received */
	65	native_size = (__force __be32 *) (hdr + 2);
	66	size = be32_to_cpu(*native_size);
	67
	68	if (count < size) {
	69	dev_err(&chip->pci_dev->dev,
	70	"Recv size(%d) less than available space\n", size);
	71	for (; i < size; i++) { /* clear the waiting data anyway */
	72	status = inb(chip->vendor->base + 1);
	73	if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
	74	dev_err(&chip->pci_dev->dev,
	75	"error reading data\n");
	76	return -EIO;
	77	}
	78	}
	79	return -EIO;
	80	}
	81
	82	/* read all the data available */
	83	for (; i < size; i++) {
	84	status = inb(chip->vendor->base + 1);
	85	if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
	86	dev_err(&chip->pci_dev->dev,
	87	"error reading data\n");
	88	return -EIO;
	89	}
	90	*buf++ = inb(chip->vendor->base);
	91	}
	92
	93	/* make sure data available is gone */
	94	status = inb(chip->vendor->base + 1);
	95	if (status & ATML_STATUS_DATA_AVAIL) {
	96	dev_err(&chip->pci_dev->dev, "data available is stuck\n");
	97	return -EIO;
	98	}
	99
	100	return size;
	101	}
	102
	103	static int tpm_atml_send(struct tpm_chip chip, u8 buf, size_t count)
	104	{
	105	int i;
106
107	dev_dbg(&chip->pci_dev->dev, "tpm_atml_send: ");
108	for (i = 0; i < count; i++) {
109	dev_dbg(&chip->pci_dev->dev, "0x%x(%d) ", buf[i], buf[i]);
110	outb(buf[i], chip->vendor->base);
111	}
112
113	return count;
114	}
115
116	static void tpm_atml_cancel(struct tpm_chip *chip)
117	{
118	outb(ATML_STATUS_ABORT, chip->vendor->base + 1);
119	}
120
b4ed3e3c KJH	121	static u8 tpm_atml_status(struct tpm_chip *chip)
	122	{
	123	return inb(chip->vendor->base + 1);
	124	}
	125
1da177e4 LT	126	static struct file_operations atmel_ops = {
	127	.owner = THIS_MODULE,
	128	.llseek = no_llseek,
	129	.open = tpm_open,
	130	.read = tpm_read,
	131	.write = tpm_write,
	132	.release = tpm_release,
	133	};
	134
6659ca2a KH	135	static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
	136	static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
	137	static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
	138	static DEVICE_ATTR(cancel, S_IWUSR \|S_IWGRP, NULL, tpm_store_cancel);
	139
	140	static struct attribute* atmel_attrs[] = {
	141	&dev_attr_pubek.attr,
	142	&dev_attr_pcrs.attr,
	143	&dev_attr_caps.attr,
	144	&dev_attr_cancel.attr,
	145	0,
	146	};
	147
	148	static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };
	149
1da177e4 LT	150	static struct tpm_vendor_specific tpm_atmel = {
	151	.recv = tpm_atml_recv,
	152	.send = tpm_atml_send,
	153	.cancel = tpm_atml_cancel,
b4ed3e3c	154	.status = tpm_atml_status,
1da177e4 LT	155	.req_complete_mask = ATML_STATUS_BUSY \| ATML_STATUS_DATA_AVAIL,
1da177e4 LT	156	.req_complete_val = ATML_STATUS_DATA_AVAIL,
d9e5b6bf	157	.req_canceled = ATML_STATUS_READY,
6659ca2a	158	.attr_group = &atmel_attr_grp,
1da177e4 LT	159	.miscdev = { .fops = &atmel_ops, },
	160	};
	161
	162	static int __devinit tpm_atml_init(struct pci_dev *pci_dev,
	163	const struct pci_device_id *pci_id)
	164	{
	165	u8 version[4];
	166	int rc = 0;
e1a23c66	167	int lo, hi;
1da177e4 LT	168
	169	if (pci_enable_device(pci_dev))
	170	return -EIO;
	171
daacdfa6 KJH	172	lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
daacdfa6 KJH	173	hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
e1a23c66 KH	174
	175	tpm_atmel.base = (hi<<8)\|lo;
	176	dev_dbg( &pci_dev->dev, "Operating with base: 0x%x\n", tpm_atmel.base);
1da177e4 LT	177
1da177e4 LT	178	/* verify that it is an Atmel part */
daacdfa6 KJH	179	if (tpm_read_index(TPM_ADDR, 4) != 'A' \|\| tpm_read_index(TPM_ADDR, 5) != 'T'
daacdfa6 KJH	180	\|\| tpm_read_index(TPM_ADDR, 6) != 'M' \|\| tpm_read_index(TPM_ADDR, 7) != 'L') {
1da177e4 LT	181	rc = -ENODEV;
	182	goto out_err;
	183	}
	184
	185	/* query chip for its version number */
daacdfa6 KJH	186	if ((version[0] = tpm_read_index(TPM_ADDR, 0x00)) != 0xFF) {
	187	version[1] = tpm_read_index(TPM_ADDR, 0x01);
	188	version[2] = tpm_read_index(TPM_ADDR, 0x02);
	189	version[3] = tpm_read_index(TPM_ADDR, 0x03);
1da177e4 LT	190	} else {
	191	dev_info(&pci_dev->dev, "version query failed\n");
	192	rc = -ENODEV;
	193	goto out_err;
	194	}
	195
	196	if ((rc = tpm_register_hardware(pci_dev, &tpm_atmel)) < 0)
	197	goto out_err;
	198
	199	dev_info(&pci_dev->dev,
	200	"Atmel TPM version %d.%d.%d.%d\n", version[0], version[1],
	201	version[2], version[3]);
	202
	203	return 0;
	204	out_err:
	205	pci_disable_device(pci_dev);
	206	return rc;
	207	}
	208
	209	static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
	210	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
	211	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
	212	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
	213	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
	214	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
5ba4d46d PMH	215	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
	216	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
	217	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0)},
1da177e4	218	{PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
a6df7da8	219	{PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6LPC)},
1da177e4 LT	220	{0,}
	221	};
	222
	223	MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
	224
	225	static struct pci_driver atmel_pci_driver = {
	226	.name = "tpm_atmel",
	227	.id_table = tpm_pci_tbl,
	228	.probe = tpm_atml_init,
	229	.remove = __devexit_p(tpm_remove),
	230	.suspend = tpm_pm_suspend,
	231	.resume = tpm_pm_resume,
	232	};
	233
	234	static int __init init_atmel(void)
	235	{
	236	return pci_register_driver(&atmel_pci_driver);
	237	}
	238
	239	static void __exit cleanup_atmel(void)
	240	{
	241	pci_unregister_driver(&atmel_pci_driver);
	242	}
	243
	244	module_init(init_atmel);
	245	module_exit(cleanup_atmel);
	246
	247	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	248	MODULE_DESCRIPTION("TPM Driver");
	249	MODULE_VERSION("2.0");
	250	MODULE_LICENSE("GPL");