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/*
* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <arch/early_variables.h>
#include <console/console.h>
#include <security/tpm/tis.h>
#include "tpm.h"
static unsigned tpm_is_open CAR_GLOBAL;
static const struct {
uint16_t vid;
uint16_t did;
const char *device_name;
} dev_map[] = {
{ 0x15d1, 0x001b, "SLB9670" },
{ 0x1ae0, 0x0028, "CR50" },
};
static const char *tis_get_dev_name(struct tpm2_info *info)
{
int i;
for (i = 0; i < ARRAY_SIZE(dev_map); i++)
if ((dev_map[i].vid == info->vendor_id) &&
(dev_map[i].did == info->device_id))
return dev_map[i].device_name;
return "Unknown";
}
int tis_open(void)
{
if (car_get_var(tpm_is_open)) {
printk(BIOS_ERR, "tis_open() called twice.\n");
return -1;
}
return 0;
}
int tis_close(void)
{
if (car_get_var(tpm_is_open)) {
/*
* Do we need to do something here, like waiting for a
* transaction to stop?
*/
car_set_var(tpm_is_open, 0);
}
return 0;
}
int tis_init(void)
{
struct spi_slave spi;
struct tpm2_info info;
if (spi_setup_slave(CONFIG_DRIVER_TPM_SPI_BUS,
CONFIG_DRIVER_TPM_SPI_CHIP, &spi)) {
printk(BIOS_ERR, "Failed to setup TPM SPI slave\n");
return -1;
}
if (tpm2_init(&spi)) {
printk(BIOS_ERR, "Failed to initialize TPM SPI interface\n");
return -1;
}
tpm2_get_info(&info);
printk(BIOS_INFO, "Initialized TPM device %s revision %d\n",
tis_get_dev_name(&info), info.revision);
return 0;
}
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
uint8_t *recvbuf, size_t *rbuf_len)
{
int len = tpm2_process_command(sendbuf, sbuf_size, recvbuf, *rbuf_len);
if (len == 0)
return -1;
*rbuf_len = len;
return 0;
}
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