| /* |
| * Copyright (c) 2017 Linaro Limited. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <device.h> |
| #include <random.h> |
| #include <drivers/rand32.h> |
| #include <init.h> |
| |
| #include "fsl_trng.h" |
| |
| static int random_mcux_trng_get_entropy(struct device *dev, u8_t *buffer, |
| u16_t length) |
| { |
| status_t status; |
| |
| ARG_UNUSED(dev); |
| |
| status = TRNG_GetRandomData(TRNG0, buffer, length); |
| __ASSERT_NO_MSG(!status); |
| |
| return 0; |
| } |
| |
| static const struct random_driver_api random_mcux_trng_api_funcs = { |
| .get_entropy = random_mcux_trng_get_entropy |
| }; |
| |
| static int random_mcux_trng_init(struct device *); |
| |
| DEVICE_AND_API_INIT(random_mcux_trng, CONFIG_RANDOM_NAME, |
| random_mcux_trng_init, NULL, NULL, |
| PRE_KERNEL_2, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, |
| &random_mcux_trng_api_funcs); |
| |
| static int random_mcux_trng_init(struct device *dev) |
| { |
| trng_config_t conf; |
| status_t status; |
| |
| ARG_UNUSED(dev); |
| |
| status = TRNG_GetDefaultConfig(&conf); |
| __ASSERT_NO_MSG(!status); |
| |
| status = TRNG_Init(TRNG0, &conf); |
| __ASSERT_NO_MSG(!status); |
| |
| return 0; |
| } |
| |
| u32_t sys_rand32_get(void) |
| { |
| u32_t output; |
| int rc; |
| |
| rc = random_mcux_trng_get_entropy(DEVICE_GET(random_mcux_trng), |
| (u8_t *) &output, sizeof(output)); |
| __ASSERT_NO_MSG(!rc); |
| |
| return output; |
| } |