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/*
* Copyright (c) 2006-2018, Synwit Technology Co.,Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-07-10 lik first version
*/
#include "drv_crypto.h"
#include <string.h>
#ifdef RT_USING_HWCRYPTO
struct swm_hwcrypto_device
{
struct rt_hwcrypto_device dev;
struct rt_mutex mutex;
};
#ifdef BSP_USING_CRC
static struct hwcrypto_crc_cfg crc_backup_cfg;
static rt_uint32_t _crc_update(struct hwcrypto_crc *ctx, const rt_uint8_t *in, rt_size_t length)
{
rt_uint32_t result = 0;
struct swm_hwcrypto_device *swm_hw_dev = (struct swm_hwcrypto_device *)ctx->parent.device->user_data;
struct swm_crc_cfg *hw_crc_cfg = (struct swm_crc_cfg *)(ctx->parent.contex);
rt_mutex_take(&swm_hw_dev->mutex, RT_WAITING_FOREVER);
if (memcmp(&crc_backup_cfg, &ctx->crc_cfg, sizeof(struct hwcrypto_crc_cfg)) != 0)
{
hw_crc_cfg->CRCx = CRC;
hw_crc_cfg->inival = ctx->crc_cfg.last_val;
switch (ctx->crc_cfg.width)
{
case 8:
hw_crc_cfg->crc_inbits = 2;
break;
case 16:
hw_crc_cfg->crc_inbits = 1;
break;
case 32:
hw_crc_cfg->crc_inbits = 0;
break;
default:
goto _exit;
}
switch (ctx->crc_cfg.poly)
{
case 0x1021:
hw_crc_cfg->crc_1632 = 1;
break;
case 0x04C11DB7:
hw_crc_cfg->crc_1632 = 0;
break;
default:
goto _exit;
}
hw_crc_cfg->crc_out_not = 0;
switch (ctx->crc_cfg.flags)
{
case 0:
case CRC_FLAG_REFIN:
hw_crc_cfg->crc_out_rev = 0;
break;
case CRC_FLAG_REFOUT:
case CRC_FLAG_REFIN | CRC_FLAG_REFOUT:
hw_crc_cfg->crc_out_rev = 1;
break;
default:
goto _exit;
}
CRC_Init(hw_crc_cfg->CRCx, (hw_crc_cfg->crc_inbits << 1) | hw_crc_cfg->crc_1632, hw_crc_cfg->crc_out_not, hw_crc_cfg->crc_out_rev, hw_crc_cfg->inival);
memcpy(&crc_backup_cfg, &ctx->crc_cfg, sizeof(struct hwcrypto_crc_cfg));
}
for (uint32_t i = 0; i < length; i++)
CRC_Write((uint32_t)in[i]);
result = CRC_Result();
ctx->crc_cfg.last_val = result;
crc_backup_cfg.last_val = ctx->crc_cfg.last_val;
result = (result ? result ^ (ctx->crc_cfg.xorout) : result);
_exit:
rt_mutex_release(&swm_hw_dev->mutex);
return result;
}
static const struct hwcrypto_crc_ops crc_ops =
{
.update = _crc_update,
};
#endif /* BSP_USING_CRC */
static rt_err_t _crypto_create(struct rt_hwcrypto_ctx *ctx)
{
rt_err_t res = RT_EOK;
switch (ctx->type & HWCRYPTO_MAIN_TYPE_MASK)
{
#if defined(BSP_USING_CRC)
case HWCRYPTO_TYPE_CRC:
{
struct swm_crc_cfg *contex = rt_calloc(1, sizeof(struct swm_crc_cfg));
if (RT_NULL == contex)
{
res = -RT_ERROR;
break;
}
contex->CRCx = DEFAULT_CRC;
contex->inival = DEFAULT_INIVAL;
contex->crc_inbits = DEFAULT_INBITS;
contex->crc_1632 = DEFAULT_CRC1632;
contex->crc_out_not = DEFAULT_OUT_NOT;
contex->crc_out_rev = DEFAULT_OUT_REV;
ctx->contex = contex;
((struct hwcrypto_crc *)ctx)->ops = &crc_ops;
break;
}
#endif /* BSP_USING_CRC */
default:
res = -RT_ERROR;
break;
}
return res;
}
static void _crypto_destroy(struct rt_hwcrypto_ctx *ctx)
{
struct swm_crc_cfg *hw_crc_cfg = (struct swm_crc_cfg *)(ctx->contex);
switch (ctx->type & HWCRYPTO_MAIN_TYPE_MASK)
{
#if defined(BSP_USING_CRC)
case HWCRYPTO_TYPE_CRC:
hw_crc_cfg->CRCx->CR &= ~CRC_CR_EN_Msk;
break;
#endif /* BSP_USING_CRC */
default:
break;
}
rt_free(ctx->contex);
}
static rt_err_t _crypto_clone(struct rt_hwcrypto_ctx *des, const struct rt_hwcrypto_ctx *src)
{
rt_err_t res = RT_EOK;
switch (src->type & HWCRYPTO_MAIN_TYPE_MASK)
{
#if defined(BSP_USING_CRC)
case HWCRYPTO_TYPE_CRC:
if (des->contex && src->contex)
{
rt_memcpy(des->contex, src->contex, sizeof(struct swm_crc_cfg));
}
break;
#endif /* BSP_USING_CRC */
default:
res = -RT_ERROR;
break;
}
return res;
}
static void _crypto_reset(struct rt_hwcrypto_ctx *ctx)
{
struct swm_crc_cfg *hw_crc_cfg = (struct swm_crc_cfg *)(ctx->contex);
switch (ctx->type & HWCRYPTO_MAIN_TYPE_MASK)
{
#if defined(BSP_USING_CRC)
case HWCRYPTO_TYPE_CRC:
hw_crc_cfg->CRCx->CR &= ~CRC_CR_EN_Msk;
break;
#endif /* BSP_USING_CRC */
default:
break;
}
}
static const struct rt_hwcrypto_ops _ops =
{
.create = _crypto_create,
.destroy = _crypto_destroy,
.copy = _crypto_clone,
.reset = _crypto_reset,
};
int rt_hw_crypto_init(void)
{
static struct swm_hwcrypto_device _crypto_dev;
rt_uint32_t cpuid[2] = {0};
_crypto_dev.dev.ops = &_ops;
cpuid[0] = SCB->CPUID;
_crypto_dev.dev.id = 0;
rt_memcpy(&_crypto_dev.dev.id, cpuid, 8);
_crypto_dev.dev.user_data = &_crypto_dev;
if (rt_hwcrypto_register(&_crypto_dev.dev, RT_HWCRYPTO_DEFAULT_NAME) != RT_EOK)
{
return -1;
}
rt_mutex_init(&_crypto_dev.mutex, RT_HWCRYPTO_DEFAULT_NAME, RT_IPC_FLAG_PRIO);
return 0;
}
INIT_BOARD_EXPORT(rt_hw_crypto_init);
#endif /* RT_USING_HWCRYPTO */
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