linux/drivers/char/tpm/tpm_atmel.c
Kent Yoder 8e81cc13a8 tpmdd maintainers
Fix up the maintainers info in the tpm drivers.  Kylene will be out for
some time, so copying the sourceforge list is the best way to get some
attention.

Cc: Marcel Selhorst <tpm@selhorst.net>
Cc: Kylene Jo Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22 19:52:44 -07:00

243 lines
5.6 KiB
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 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 = ATML_STATUS_READY,
.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 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;
void __iomem *iobase = NULL;
int have_region, region_size;
unsigned long base;
struct tpm_chip *chip;
rc = 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:
driver_unregister(&atml_drv);
return rc;
}
static void __exit cleanup_atmel(void)
{
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");