/*
* 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 */
#define TPM_ATML_BASE 0x400
/* write status bits */
#define ATML_STATUS_ABORT 0x01
#define ATML_STATUS_LASTBYTE 0x04
/* read status bits */
#define ATML_STATUS_BUSY 0x01
#define ATML_STATUS_DATA_AVAIL 0x02
#define ATML_STATUS_REWRITE 0x04
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 struct file_operations atmel_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.open = tpm_open,
.read = tpm_read,
.write = tpm_write,
.release = tpm_release,
};
static struct tpm_vendor_specific tpm_atmel = {
.recv = tpm_atml_recv,
.send = tpm_atml_send,
.cancel = tpm_atml_cancel,
.req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
.req_complete_val = ATML_STATUS_DATA_AVAIL,
.base = TPM_ATML_BASE,
.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;
if (pci_enable_device(pci_dev))
return -EIO;
if (tpm_lpc_bus_init(pci_dev, TPM_ATML_BASE)) {
rc = -ENODEV;
goto out_err;
}
/* verify that it is an Atmel part */
if (tpm_read_index(4) != 'A' || tpm_read_index(5) != 'T'
|| tpm_read_index(6) != 'M' || tpm_read_index(7) != 'L') {
rc = -ENODEV;
goto out_err;
}
/* query chip for its version number */
if ((version[0] = tpm_read_index(0x00)) != 0xFF) {
version[1] = tpm_read_index(0x01);
version[2] = tpm_read_index(0x02);
version[3] = tpm_read_index(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_AMD, PCI_DEVICE_ID_AMD_8111_LPC)},
{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");
