126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
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// Copyright 2020-2021 Beken
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdlib.h>
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#include <common/bk_include.h>
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#include <os/os.h>
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#include <os/mem.h>
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#include <driver/trng.h>
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#include "trng_driver.h"
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#include "trng_hal.h"
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#include "sys_driver.h"
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#include "bk_misc.h"
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typedef struct {
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trng_hal_t hal;
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bool is_enabled;
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} trng_driver_t;
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#define TRNG_RETURN_ON_NOT_INIT() do {\
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if (!s_trng_driver_is_init) {\
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return BK_ERR_TRNG_DRIVER_NOT_INIT;\
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}\
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} while(0)
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#define TRNG_READ_COUNT (16)
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static trng_driver_t s_trng = {0};
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static bool s_trng_driver_is_init = false;
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static void trng_init_common(void)
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{
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trng_hal_start_common(&s_trng.hal);
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s_trng.is_enabled = true;
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}
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static void trng_deinit_common(void)
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{
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trng_hal_stop_common(&s_trng.hal);
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s_trng.is_enabled = false;
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}
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static uint32_t trng_get_random_number(void)
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{
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uint32_t number = 0;
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#if (CONFIG_SOC_BK7256XX)
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sys_drv_trng_disckg_set(1);
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extern void delay_us(UINT32 us);
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delay_us(1); //wait disckg take effect
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#endif
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number = trng_hal_get_random_number(&s_trng.hal);
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#if (CONFIG_SOC_BK7256XX)
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sys_drv_trng_disckg_set(0);
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#endif
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return number;
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}
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bk_err_t bk_trng_driver_init(void)
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{
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if (s_trng_driver_is_init) {
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return BK_OK;
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}
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os_memset(&s_trng, 0, sizeof(s_trng));
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trng_hal_init(&s_trng.hal);
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s_trng_driver_is_init = true;
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return BK_OK;
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}
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bk_err_t bk_trng_driver_deinit(void)
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{
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if (!s_trng_driver_is_init) {
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return BK_OK;
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}
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trng_deinit_common();
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s_trng_driver_is_init = false;
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return BK_OK;
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}
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bk_err_t bk_trng_start(void)
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{
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TRNG_RETURN_ON_NOT_INIT();
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trng_init_common();
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return BK_OK;
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}
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bk_err_t bk_trng_stop(void)
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{
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TRNG_RETURN_ON_NOT_INIT();
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trng_deinit_common();
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return BK_OK;
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}
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int bk_rand(void)
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{
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int i = 0, number = 0;
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bk_trng_start();
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delay_us(50); //add delay to make trng disckg take effect
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/*Different board , same time point, the trng generate random number maybe same*/
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for(i = 0; i < TRNG_READ_COUNT; i++) {
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trng_get_random_number();
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}
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number = (int)trng_get_random_number();
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bk_trng_stop(); //close it after finish for power save
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return (number & RAND_MAX);
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}
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