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/*
* Copyright (C) 2011 Infineon Technologies
*
* Authors:
* Peter Huewe <huewe.external@infineon.com>
*
* Description:
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*
* It is based on the Linux kernel driver tpm.c from Leendert van
* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
*
* Version: 2.1.1
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <delay.h>
#include <console/console.h>
#include <arch/byteorder.h>
#include "tis.h"
#include "tpm.h"
/* global structure for tpm chip data */
struct tpm_chip g_chip;
#define TPM_CMD_COUNT_BYTE 2
#define TPM_CMD_ORDINAL_BYTE 6
ssize_t tpm_transmit(const uint8_t *buf, size_t bufsiz)
{
ssize_t rc;
uint32_t count, ordinal;
struct tpm_chip *chip = &g_chip;
memcpy(&count, buf + TPM_CMD_COUNT_BYTE, sizeof(count));
count = be32_to_cpu(count);
memcpy(&ordinal, buf + TPM_CMD_ORDINAL_BYTE, sizeof(ordinal));
ordinal = be32_to_cpu(ordinal);
if (count == 0) {
printk(BIOS_DEBUG, "tpm_transmit: no data\n");
return -1; //ENODATA;
}
if (count > bufsiz) {
printk(BIOS_DEBUG, "tpm_transmit: invalid count value %x %zx\n",
count, bufsiz);
return -1; //E2BIG;
}
ASSERT(chip->vendor.send);
rc = chip->vendor.send(chip, (uint8_t *) buf, count);
if (rc < 0) {
printk(BIOS_DEBUG, "tpm_transmit: tpm_send: error %zd\n", rc);
goto out;
}
if (chip->vendor.irq)
goto out_recv;
int timeout = 2 * 60 * 1000; /* two minutes timeout */
while (timeout) {
ASSERT(chip->vendor.status);
uint8_t status = chip->vendor.status(chip);
if ((status & chip->vendor.req_complete_mask) ==
chip->vendor.req_complete_val) {
goto out_recv;
}
if ((status == chip->vendor.req_canceled)) {
printk(BIOS_DEBUG, "tpm_transmit: Operation Canceled\n");
rc = -1;
goto out;
}
mdelay(TPM_TIMEOUT);
timeout--;
}
ASSERT(chip->vendor.cancel);
chip->vendor.cancel(chip);
printk(BIOS_DEBUG, "tpm_transmit: Operation Timed out\n");
rc = -1; //ETIME;
goto out;
out_recv:
rc = chip->vendor.recv(chip, (uint8_t *) buf, TPM_BUFSIZE);
if (rc < 0)
printk(BIOS_DEBUG, "tpm_transmit: tpm_recv: error %zd\n", rc);
out:
return rc;
}
#define TPM_ERROR_SIZE 10
struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry)
{
struct tpm_chip *chip;
/* Driver specific per-device data */
chip = &g_chip;
memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
chip->is_open = 1;
return chip;
}
int tpm_open(unsigned bus, uint32_t dev_addr)
{
int rc;
if (g_chip.is_open)
return -1; //EBUSY;
rc = tpm_vendor_init(bus, dev_addr);
if (rc < 0)
g_chip.is_open = 0;
return rc;
}
void tpm_close(void)
{
if (g_chip.is_open) {
tpm_vendor_cleanup(&g_chip);
g_chip.is_open = 0;
}
}
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