kopia lustrzana https://github.com/espressif/esp-idf
149 wiersze
3.9 KiB
C
149 wiersze
3.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "esp_crypto_shared_gdma.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "hal/gdma_ll.h"
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#include "soc/soc_caps.h"
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#include "esp_log.h"
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#include "esp_err.h"
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#include "esp_crypto_lock.h"
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#define NEW_CHANNEL_TIMEOUT_MS 1000
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#define NEW_CHANNEL_DELAY_MS 100
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static const char *TAG = "crypto_shared_gdma";
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static gdma_channel_handle_t rx_channel;
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static gdma_channel_handle_t tx_channel;
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/* Allocate a new GDMA channel, will keep trying until NEW_CHANNEL_TIMEOUT_MS */
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static inline esp_err_t crypto_shared_gdma_new_channel(gdma_channel_alloc_config_t *channel_config, gdma_channel_handle_t *channel)
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{
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esp_err_t ret;
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int time_waited_ms = 0;
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while (1) {
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ret = gdma_new_channel(channel_config, channel);
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if (ret == ESP_OK) {
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break;
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} else if (time_waited_ms >= NEW_CHANNEL_TIMEOUT_MS) {
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*channel = NULL;
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break;
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}
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time_waited_ms += NEW_CHANNEL_DELAY_MS;
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vTaskDelay(NEW_CHANNEL_DELAY_MS / portTICK_PERIOD_MS);
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}
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return ret;
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}
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/* Initialize GDMA module and channels */
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static esp_err_t crypto_shared_gdma_init(void)
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{
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esp_err_t ret;
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gdma_channel_alloc_config_t channel_config_tx = {
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.direction = GDMA_CHANNEL_DIRECTION_TX,
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};
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gdma_channel_alloc_config_t channel_config_rx = {
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.direction = GDMA_CHANNEL_DIRECTION_RX,
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};
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gdma_transfer_ability_t transfer_ability = {
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.sram_trans_align = 1,
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};
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ret = crypto_shared_gdma_new_channel(&channel_config_tx, &tx_channel);
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if (ret != ESP_OK) {
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goto err;
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}
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ret = crypto_shared_gdma_new_channel(&channel_config_rx, &rx_channel);
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if (ret != ESP_OK) {
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gdma_del_channel(tx_channel); // Clean up already allocated TX channel
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goto err;
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}
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gdma_set_transfer_ability(tx_channel, &transfer_ability);
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gdma_set_transfer_ability(rx_channel, &transfer_ability);
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gdma_connect(rx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_AES, 0));
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gdma_connect(tx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_AES, 0));
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return ESP_OK;
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err:
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ESP_LOGE(TAG, "Failed to acquire DMA channel, Err=%d", ret);
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tx_channel = NULL;
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rx_channel = NULL;
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return ret;
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}
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esp_err_t esp_crypto_shared_gdma_start(const lldesc_t *input, const lldesc_t *output, gdma_trigger_peripheral_t peripheral)
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{
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int rx_ch_id = 0;
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esp_err_t ret = ESP_OK;
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if (tx_channel == NULL) {
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/* Allocate a pair of RX and TX for crypto, should only happen the first time we use the GMDA
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or if user called esp_crypto_shared_gdma_release */
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ret = crypto_shared_gdma_init();
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}
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if (ret != ESP_OK) {
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return ret;
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}
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/* Tx channel is shared between AES and SHA, need to connect to peripheral every time */
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gdma_disconnect(tx_channel);
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if (peripheral == GDMA_TRIG_PERIPH_SHA) {
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gdma_connect(tx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SHA, 0));
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} else if (peripheral == GDMA_TRIG_PERIPH_AES) {
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gdma_connect(tx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_AES, 0));
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} else {
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return ESP_ERR_INVALID_ARG;
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}
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/* tx channel is reset by gdma_connect(), also reset rx to ensure a known state */
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gdma_get_channel_id(rx_channel, &rx_ch_id);
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gdma_ll_rx_reset_channel(&GDMA, rx_ch_id);
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gdma_start(tx_channel, (intptr_t)input);
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gdma_start(rx_channel, (intptr_t)output);
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return ESP_OK;
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}
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void esp_crypto_shared_gdma_free()
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{
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esp_crypto_sha_aes_lock_acquire();
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if (rx_channel != NULL) {
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gdma_disconnect(rx_channel);
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gdma_del_channel(rx_channel);
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rx_channel = NULL;
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}
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if (tx_channel != NULL) {
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gdma_disconnect(tx_channel);
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gdma_del_channel(tx_channel);
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tx_channel = NULL;
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}
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esp_crypto_sha_aes_lock_release();
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}
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