esp-idf/components/mbedtls/port/include/esp_crypto_shared_gdma.h

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// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include "soc/lldesc.h"
#include "esp_private/gdma.h"
#include "esp_err.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Start a GDMA transfer on the shared crypto DMA channel
*
* @note Will allocate a GDMA channel for AES & SHA if no such channel is already allocated
*
* @param input Input linked list descriptor
* @param output Output linked list descriptor
* @param peripheral Crypto peripheral to connect the DMA to, either GDMA_TRIG_PERIPH_AES or
* GDMA_TRIG_PERIPH_SHA
* @return esp_err_t ESP_FAIL if no GDMA channel available
*/
esp_err_t esp_crypto_shared_gdma_start(const lldesc_t *input, const lldesc_t *output, gdma_trigger_peripheral_t peripheral);
/**
* @brief Frees any shared crypto DMA channel, if esp_crypto_shared_gdma_start is called after
* this, new GDMA channels will be allocated.
*
* @note Function is meant to be called from user code, and thus takes AES/SHA lock.
* This means this function should not be called from code which already takes these locks,
* i.e. inside our AES/SHA code.
*
* If you are continously using AES/SHA (e.g. because of a wifi connection) then it's not recommended
* to use this API. Freeing the channel is mainly for use cases where you are finished with the crypto peripherals
* and need the DMA channel for other peripherals. An example would be doing some processing after disconnecting WiFi
*/
void esp_crypto_shared_gdma_free(void);
#ifdef __cplusplus
}
#endif