wolfTPM/hal/tpm_io_barebox.c

96 lines
3.0 KiB
C

/* tpm_io_barebox.c
*
* Copyright (C) 2006-2022 wolfSSL Inc.
*
* This file is part of wolfTPM.
*
* wolfTPM 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.
*
* wolfTPM 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/* This example shows IO interfaces for Barebox */
#include <wolftpm/tpm2.h>
#include <wolftpm/tpm2_tis.h>
#include "tpm_io.h"
/******************************************************************************/
/* --- BEGIN IO Callback Logic -- */
/******************************************************************************/
/* Included via tpm_io.c if WOLFTPM_INCLUDE_IO_FILE is defined */
#ifdef WOLFTPM_INCLUDE_IO_FILE
#if ! (defined(WOLFTPM_LINUX_DEV) || \
defined(WOLFTPM_SWTPM) || \
defined(WOLFTPM_WINAPI) )
/* Use the max speed by default - see tpm2_types.h for chip specific max values */
#ifndef TPM2_SPI_HZ
#define TPM2_SPI_HZ TPM2_SPI_MAX_HZ
#endif
#if defined(__BAREBOX__)
#include <spi/spi.h>
#include <spi/spi_gpio.h>
int TPM2_IoCb_Barebox_SPI(TPM2_CTX* ctx, const byte* txBuf,
byte* rxBuf, word16 xferSz, void* userCtx)
{
int ret = TPM_RC_FAILURE;
struct spi_device spi;
int bus = 0;
struct spi_transfer t;
struct spi_message m;
#ifdef WOLFTPM_CHECK_WAIT_STATE
#error SPI check wait state logic not supported for BareBox
#endif
XMEMSET(&spi, 0, sizeof(spi));
spi.master = spi_get_master(bus); /* get bus 0 master */
spi.max_speed_hz = 1 * 1000 * 1000; /* 1 MHz */
spi.mode = 0; /* Mode 0 (CPOL=0, CPHA=0) */
spi.bits_per_word = 8; /* 8-bits */
spi.chip_select = 0; /* Use CS 0 */
/* setup SPI master */
ret = spi.master->setup(&spi);
/* setup transfer */
XMEMSET(&t, 0, sizeof(t));
t.tx_buf = txBuf;
t.rx_buf = rxBuf;
t.len = xferSz;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
ret = spi_sync(&spi, &m);
if (ret == 0)
ret = TPM_RC_SUCCESS;
(void)userCtx;
(void)ctx;
return ret;
}
#endif
#endif /* !(WOLFTPM_LINUX_DEV || WOLFTPM_SWTPM || WOLFTPM_WINAPI) */
#endif /* WOLFTPM_INCLUDE_IO_FILE */
/******************************************************************************/
/* --- END IO Callback Logic -- */
/******************************************************************************/