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/*
* mkmif.c
* -------
* HAL interface to Cryptech Master Key Memory Interface.
*
* Copyright (c) 2016, NORDUnet A/S
* All rights reserved.
*
* 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 NORDUnet 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 <stdlib.h>
#include "hal.h"
#include "hal_internal.h"
typedef union {
uint8_t byte[4];
uint32_t word;
} byteword_t;
hal_error_t hal_mkmif_init(hal_core_t *core)
{
byteword_t cmd;
hal_error_t err;
cmd.word = htonl(MKMIF_CTRL_CMD_INIT);
err = hal_core_alloc(MKMIF_NAME, &core) ||
hal_io_write(core, MKMIF_ADDR_CTRL, cmd.byte, 4) ||
hal_io_wait_ready(core);
hal_core_free(core);
return err;
}
hal_error_t hal_mkmif_set_clockspeed(hal_core_t *core, const uint32_t divisor)
{
byteword_t data;
hal_error_t err;
data.word = htonl(divisor);
err = hal_core_alloc(MKMIF_NAME, &core) ||
hal_io_write(core, MKMIF_ADDR_SCLK_DIV, data.byte, 4);
hal_core_free(core);
return err;
}
hal_error_t hal_mkmif_get_clockspeed(hal_core_t *core, uint32_t *divisor)
{
byteword_t data;
hal_error_t err;
err = hal_core_alloc(MKMIF_NAME, &core) ||
hal_io_read(core, MKMIF_ADDR_SCLK_DIV, data.byte, 4);
if (err == HAL_OK)
*divisor = htonl(data.word);
hal_core_free(core);
return err;
}
hal_error_t hal_mkmif_write(hal_core_t *core, uint32_t addr, const uint8_t *buf, size_t len)
{
byteword_t cmd;
hal_error_t err;
if (len % 4 != 0)
return HAL_ERROR_IO_BAD_COUNT;
cmd.word = htonl(MKMIF_CTRL_CMD_WRITE);
if ((err = hal_core_alloc(MKMIF_NAME, &core)) == HAL_OK) {
for (; len > 0; addr += 4, buf += 4, len -= 4) {
byteword_t write_addr;
write_addr.word = htonl((uint32_t)addr);
if ((err = hal_io_write(core, MKMIF_ADDR_EMEM_ADDR, write_addr.byte, 4)) ||
(err = hal_io_write(core, MKMIF_ADDR_EMEM_DATA, buf, 4)) ||
(err = hal_io_write(core, MKMIF_ADDR_CTRL, cmd.byte, 4)) ||
(err = hal_io_wait_ready(core)))
return err;
}
}
hal_core_free(core);
return err;
}
hal_error_t hal_mkmif_write_word(hal_core_t *core, uint32_t addr, const uint32_t data)
{
byteword_t d;
d.word = htonl(data);
return hal_mkmif_write(core, addr, d.byte, 4);
}
hal_error_t hal_mkmif_read(hal_core_t *core, uint32_t addr, uint8_t *buf, size_t len)
{
byteword_t cmd;
hal_error_t err;
if (len % 4 != 0)
return HAL_ERROR_IO_BAD_COUNT;
cmd.word = htonl(MKMIF_CTRL_CMD_READ);
if ((err = hal_core_alloc(MKMIF_NAME, &core)) == HAL_OK) {
for (; len > 0; addr += 4, buf += 4, len -= 4) {
byteword_t read_addr;
read_addr.word = htonl((uint32_t)addr);
if ((err = hal_io_write(core, MKMIF_ADDR_EMEM_ADDR, read_addr.byte, 4)) ||
(err = hal_io_write(core, MKMIF_ADDR_CTRL, cmd.byte, 4)) ||
(err = hal_io_wait_valid(core)) ||
(err = hal_io_read(core, MKMIF_ADDR_EMEM_DATA, buf, 4)))
goto out;
}
}
out:
hal_core_free(core);
return err;
}
hal_error_t hal_mkmif_read_word(hal_core_t *core, uint32_t addr, uint32_t *data)
{
byteword_t d;
hal_error_t err;
if ((err = hal_mkmif_read(core, addr, d.byte, 4)) != HAL_OK)
return err;
*data = htonl(d.word);
return HAL_OK;
}
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