diff options
Diffstat (limited to 'FreeRTOS/Demo/T-HEAD_CB2201_CDK/csi/csi_driver/csky/common/trng/osr_trng.c')
| -rw-r--r-- | FreeRTOS/Demo/T-HEAD_CB2201_CDK/csi/csi_driver/csky/common/trng/osr_trng.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/FreeRTOS/Demo/T-HEAD_CB2201_CDK/csi/csi_driver/csky/common/trng/osr_trng.c b/FreeRTOS/Demo/T-HEAD_CB2201_CDK/csi/csi_driver/csky/common/trng/osr_trng.c new file mode 100644 index 000000000..5e1a65563 --- /dev/null +++ b/FreeRTOS/Demo/T-HEAD_CB2201_CDK/csi/csi_driver/csky/common/trng/osr_trng.c @@ -0,0 +1,241 @@ +/* + * Copyright (C) 2017 C-SKY Microsystems Co., Ltd. All rights reserved. + * + * 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. + */ + +/****************************************************************************** + * @file osr_trng.c + * @brief CSI Source File for TRNG Driver + * @version V1.0 + * @date 02. June 2017 + ******************************************************************************/ + +#include <stdbool.h> +#include <stdio.h> +#include <string.h> +#include "drv_trng.h" +#include "osr_trng.h" + + +#define ERR_TRNG(errno) (CSI_DRV_ERRNO_TRNG_BASE | errno) +#define TRNG_NULL_PARAM_CHK(para) \ + do { \ + if (para == NULL) { \ + return ERR_TRNG(EDRV_PARAMETER); \ + } \ + } while (0) + +typedef struct { + uint32_t base; + uint32_t irq; + trng_event_cb_t cb; + trng_status_t status; +} osr_trng_priv_t; + +extern int32_t target_get_trng(int32_t idx, uint32_t *base, uint32_t *irq); + +static osr_trng_priv_t trng_handle[CONFIG_TRNG_NUM]; + +/* Driver Capabilities */ +static const trng_capabilities_t driver_capabilities = { + .lowper_mode = 0 /* low power mode */ +}; + +// +// Functions +// + +osr_trng_reg_t *trng_reg = NULL; + +static int32_t trng_disable_irq(void) +{ + trng_reg->RBG_CR &= ~TRNG_IRQ_BIT; + return 0; +} + +static int32_t trng_enable(void) +{ + trng_reg->RBG_CR |= TRNG_EN; + return 0; +} + +static int32_t trng_get_data(void) +{ + int data = trng_reg->RBG_DR; + return data; +} + +static int32_t trng_data_is_ready(void) +{ + int flag = (trng_reg->RBG_FIFO_SR & TRNG_DATA_READY); + return flag; +} + +/** + \brief Initialize TRNG Interface. 1. Initializes the resources needed for the TRNG interface 2.registers event callback function + \param[in] idx device id + \param[in] cb_event Pointer to \ref trng_event_cb_t + \return pointer to trng handle +*/ +trng_handle_t csi_trng_initialize(int32_t idx, trng_event_cb_t cb_event) +{ + + if (idx < 0 || idx >= CONFIG_TRNG_NUM) { + return NULL; + } + + /* obtain the trng information */ + uint32_t base = 0u; + uint32_t irq = 0u; + int32_t real_idx = target_get_trng(idx, &base, &irq); + + if (real_idx != idx) { + return NULL; + } + + osr_trng_priv_t *trng_priv = &trng_handle[idx]; + trng_priv->base = base; + trng_priv->irq = irq; + + /* initialize the trng context */ + trng_reg = (osr_trng_reg_t *)(trng_priv->base); + trng_priv->cb = cb_event; + trng_priv->status.busy = 0; + trng_priv->status.data_valid = 0; + + trng_disable_irq(); + + return (trng_handle_t)trng_priv; +} + +/** + \brief De-initialize TRNG Interface. stops operation and releases the software resources used by the interface + \param[in] handle trng handle to operate. + \return error code +*/ +int32_t csi_trng_uninitialize(trng_handle_t handle) +{ + TRNG_NULL_PARAM_CHK(handle); + + osr_trng_priv_t *trng_priv = handle; + trng_priv->cb = NULL; + + return 0; +} + +/** + \brief Get driver capabilities. + \param[in] idx device id. + \return \ref trng_capabilities_t +*/ +//trng_capabilities_t csi_trng_get_capabilities(int32_t idx) +trng_capabilities_t csi_trng_get_capabilities(trng_handle_t handle) +{ + /* + if (idx < 0 || idx >= CONFIG_TRNG_NUM) { + trng_capabilities_t ret; + memset(&ret, 0, sizeof(trng_capabilities_t)); + return ret; + }*/ + return driver_capabilities; +} + +/** + \brief Get data from the TRNG. + \param[in] handle trng handle to operate. + \param[out] data Pointer to buffer with data get from TRNG + \param[in] num Number of data items to obtain + \return error code +*/ +int32_t csi_trng_get_data(trng_handle_t handle, void *data, uint32_t num) +{ + TRNG_NULL_PARAM_CHK(handle); + TRNG_NULL_PARAM_CHK(data); + TRNG_NULL_PARAM_CHK(num); + + osr_trng_priv_t *trng_priv = handle; + + trng_priv->status.busy = 1U; + trng_priv->status.data_valid = 0U; + + uint8_t left_len = (uint32_t)data & 0x3; + uint32_t result = 0; + + trng_enable(); + /* if the data addr is not aligned by word */ + if (left_len) { + while (!trng_data_is_ready()); + result = trng_get_data(); + + if (num > (4 - left_len)) { + memcpy(data, &result, 4 - left_len); + } else { + memcpy(data, &result, num); + trng_priv->status.busy = 0U; + trng_priv->status.data_valid = 1U; + + if (trng_priv->cb) { + //trng_priv->cb(0, TRNG_EVENT_DATA_GENERATE_COMPLETE); + trng_priv->cb(TRNG_EVENT_DATA_GENERATE_COMPLETE); + } + return 0; + } + num -= (4 - left_len); + data += (4 - left_len); + } + + uint32_t word_len = num >> 2; + left_len = num & 0x3; + + /* obtain the data by word */ + while (word_len--) { + while (!trng_data_is_ready()); + result = trng_get_data(); + *(uint32_t *)data = result; + data = (void *)((uint32_t)data + 4); + } + + /* if the num is not aligned by word */ + if (left_len) { + while (!trng_data_is_ready()); + result = trng_get_data(); + memcpy(data, &result, left_len); + } + + trng_priv->status.busy = 0U; + trng_priv->status.data_valid = 1U; + + if (trng_priv->cb) { + //trng_priv->cb(0, TRNG_EVENT_DATA_GENERATE_COMPLETE); + trng_priv->cb(TRNG_EVENT_DATA_GENERATE_COMPLETE); + } + + return 0; +} + +/** + \brief Get TRNG status. + \param[in] handle trng handle to operate. + \return TRNG status \ref trng_status_t +*/ +trng_status_t csi_trng_get_status(trng_handle_t handle) +{ + if (handle == NULL) { + trng_status_t ret; + memset(&ret, 0, sizeof(trng_status_t)); + return ret; + } + osr_trng_priv_t *trng_priv = handle; + return trng_priv->status; +} |