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/*
* Copyright (C) 2011 Infineon Technologies
* Copyright 2013 Google Inc.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*/
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <delay.h>
#include <device/i2c.h>
#include <endian.h>
#include <tpm.h>
#include "tpm.h"
#include <timer.h>
#include <console/console.h>
/* global structure for tpm chip data */
struct tpm_chip g_chip;
#define TPM_CMD_COUNT_BYTE 2
#define TPM_CMD_ORDINAL_BYTE 6
#define TPM_VALID_STATUS (1 << 7)
int tis_open(void)
{
int rc;
if (g_chip.is_open) {
printk(BIOS_DEBUG, "tis_open() called twice.\n");
return -1;
}
rc = tpm_vendor_init(CONFIG_DRIVER_TPM_I2C_BUS,
CONFIG_DRIVER_TPM_I2C_ADDR);
if (rc < 0)
g_chip.is_open = 0;
if (rc) {
return -1;
}
return 0;
}
int tis_close(void)
{
if (g_chip.is_open) {
tpm_vendor_cleanup(&g_chip);
g_chip.is_open = 0;
}
return 0;
}
int tis_init(void)
{
int bus = CONFIG_DRIVER_TPM_I2C_BUS;
int chip = CONFIG_DRIVER_TPM_I2C_ADDR;
struct stopwatch sw;
uint8_t buf = 0;
int ret;
long sw_run_duration = 750;
/*
* Probe TPM. Check if the TPM_ACCESS register's ValidSts bit is set(1)
* If the bit remains clear(0) then claim that init has failed.
*/
stopwatch_init_msecs_expire(&sw, sw_run_duration);
do {
ret = i2c_readb(bus, chip, 0, &buf);
if (!ret && (buf & TPM_VALID_STATUS)) {
sw_run_duration = stopwatch_duration_msecs(&sw);
break;
}
} while (!stopwatch_expired(&sw));
printk(BIOS_INFO,
"%s: ValidSts bit %s(%d) in TPM_ACCESS register after %ld ms\n",
__func__, (buf & TPM_VALID_STATUS) ? "set" : "clear",
(buf & TPM_VALID_STATUS) >> 7, sw_run_duration);
/*
* Claim failure if the ValidSts (bit 7) is clear.
*/
if (!(buf & TPM_VALID_STATUS))
return -1;
return 0;
}
static ssize_t tpm_transmit(const uint8_t *buf, size_t bufsiz)
{
int 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;
}
if (count > bufsiz) {
printk(BIOS_DEBUG, "tpm_transmit: invalid count value %x %zx\n",
count, bufsiz);
return -1;
}
ASSERT(chip->vendor.send);
rc = chip->vendor.send(chip, (uint8_t *) buf, count);
if (rc < 0) {
printk(BIOS_DEBUG, "tpm_transmit: tpm_send error\n");
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 %d\n", rc);
out:
return rc;
}
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
uint8_t *recvbuf, size_t *rbuf_len)
{
uint8_t buf[TPM_BUFSIZE];
if (sizeof(buf) < sbuf_size)
return -1;
memcpy(buf, sendbuf, sbuf_size);
int len = tpm_transmit(buf, sbuf_size);
if (len < 10) {
*rbuf_len = 0;
return -1;
}
if (len > *rbuf_len) {
*rbuf_len = len;
return -1;
}
memcpy(recvbuf, buf, len);
*rbuf_len = len;
return 0;
}
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