blob: 32e01450c4253bd4b5f9e3ddb1d3ce21d3f8752c [file] [log] [blame]
/*
* 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 <linux/platform_device.h>
#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->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->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->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->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->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]);
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,
NULL,
};
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 struct platform_device *pdev;
static void __devexit tpm_atml_remove(struct device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
if (chip) {
release_region(chip->vendor->base, 2);
tpm_remove_hardware(chip->dev);
}
}
static struct device_driver atml_drv = {
.name = "tpm_atmel",
.bus = &platform_bus_type,
.owner = THIS_MODULE,
.suspend = tpm_pm_suspend,
.resume = tpm_pm_resume,
};
static int __init init_atmel(void)
{
int rc = 0;
int lo, hi;
driver_register(&atml_drv);
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;
/* 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') {
return -ENODEV;
}
/* verify chip version number is 1.1 */
if ( (tpm_read_index(TPM_ADDR, 0x00) != 0x01) ||
(tpm_read_index(TPM_ADDR, 0x01) != 0x01 ))
return -ENODEV;
pdev = kzalloc(sizeof(struct platform_device), GFP_KERNEL);
if ( !pdev )
return -ENOMEM;
pdev->name = "tpm_atmel0";
pdev->id = -1;
pdev->num_resources = 0;
pdev->dev.release = tpm_atml_remove;
pdev->dev.driver = &atml_drv;
if ((rc = platform_device_register(pdev)) < 0) {
kfree(pdev);
pdev = NULL;
return rc;
}
if (request_region(tpm_atmel.base, 2, "tpm_atmel0") == NULL ) {
platform_device_unregister(pdev);
kfree(pdev);
pdev = NULL;
return -EBUSY;
}
if ((rc = tpm_register_hardware(&pdev->dev, &tpm_atmel)) < 0) {
release_region(tpm_atmel.base, 2);
platform_device_unregister(pdev);
kfree(pdev);
pdev = NULL;
return rc;
}
dev_info(&pdev->dev, "Atmel TPM 1.1, Base Address: 0x%x\n",
tpm_atmel.base);
return 0;
}
static void __exit cleanup_atmel(void)
{
if (pdev) {
tpm_atml_remove(&pdev->dev);
platform_device_unregister(pdev);
kfree(pdev);
pdev = NULL;
}
driver_unregister(&atml_drv);
}
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");