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/*
* hal_io_fmc.c
* ------------
* This module contains common code to talk to the FPGA over the FMC bus.
*
* Author: Paul Selkirk
* Copyright (c) 2014-2016, NORDUnet A/S All rights reserved.
* Copyright: 2020, The Commons Conservancy Cryptech Project
* SPDX-License-Identifier: BSD-3-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdint.h>
#include "stm-fmc.h"
/* stm32f4xx_hal_def.h and hal.h both define HAL_OK as an enum value */
#define HAL_OK HAL_OKAY
#include "hal.h"
#include "hal_internal.h"
/*
* Even no-op debugging code shows up in profiling if it's in an inner
* loop which runs often enough, so we leave now this off by default
* at compile time.
*/
#ifndef HAL_IO_FMC_DEBUG
#define HAL_IO_FMC_DEBUG 0
#endif
#if HAL_IO_FMC_DEBUG
static int debug = 0;
void hal_io_set_debug(int onoff)
{
debug = onoff;
}
static inline void dump(const char *label, const hal_addr_t offset, const uint8_t * const buf, const size_t len)
{
if (debug) {
char hex[len * 3 + 1];
for (size_t i = 0; i < len; ++i)
sprintf(hex + 3 * i, " %02x", buf[i]);
hal_log(HAL_LOG_DEBUG, "%s %04x [%s ]", label, (unsigned int) offset, hex);
}
}
#else
#define dump(...)
#endif
/*
* Translate cryptech register number to FMC address.
*/
static inline hal_addr_t fmc_offset(hal_addr_t offset)
{
return offset << 2;
}
/*
* Minimal version of memcpy, where we know the addresses and length are
* word-aligned.
*/
static inline void fmc_fpga_memcpy(uint32_t *dst, uint32_t *src, size_t nword)
{
while (nword >= 4) {
*dst++ = *src++;
*dst++ = *src++;
*dst++ = *src++;
*dst++ = *src++;
nword -= 4;
}
while (nword > 0) {
*dst++ = *src++;
nword--;
}
}
hal_error_t hal_io_write(const hal_core_t *core, hal_addr_t offset, const uint8_t *buf, size_t len)
{
if (core == NULL)
return HAL_ERROR_CORE_NOT_FOUND;
if (len % 4 != 0)
return HAL_ERROR_IO_BAD_COUNT;
dump("write ", offset + hal_core_base(core), buf, len);
offset = fmc_offset(offset + hal_core_base(core));
fmc_fpga_memcpy((uint32_t *)fmc_fpga_addr(offset), (uint32_t *)buf, len/4);
return HAL_OK;
}
hal_error_t hal_io_read(const hal_core_t *core, hal_addr_t offset, uint8_t *buf, size_t len)
{
if (core == NULL)
return HAL_ERROR_CORE_NOT_FOUND;
if (len % 4 != 0)
return HAL_ERROR_IO_BAD_COUNT;
dump("read ", offset + hal_core_base(core), buf, len);
offset = fmc_offset(offset + hal_core_base(core));
fmc_fpga_memcpy((uint32_t *)buf, (uint32_t *)fmc_fpga_addr(offset), len/4);
return HAL_OK;
}
/*
* Local variables:
* indent-tabs-mode: nil
* c-basic-offset: 2
* End:
*/
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