android_kernel_xiaomi_sm8350/drivers/char/tpm/tpm_atmel.c
Kylene Jo Hall daacdfa6e7 [PATCH] tpm: Support new National TPMs
This patch is work to support new National TPMs that problems were reported
with on Thinkpad T43 and Thinkcentre S51.  Thanks to Jens and Gang for
their debugging work on these issues.

Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 16:24:38 -07:00

242 lines
6.1 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"
/* 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 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,
.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_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");