1 /*
2 * Copyright 2022 NXP
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT nxp_css_v2
8
9 #include "mcuxClCss_Rng.h"
10
11 #include <zephyr/device.h>
12 #include <zephyr/drivers/entropy.h>
13 #include <zephyr/init.h>
14 #include <zephyr/random/random.h>
15
entropy_mcux_css_get_entropy(const struct device * dev,uint8_t * buffer,uint16_t length)16 static int entropy_mcux_css_get_entropy(const struct device *dev, uint8_t *buffer, uint16_t length)
17 {
18 ARG_UNUSED(dev);
19 uint8_t status = 0;
20
21 MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(result, token, mcuxClCss_Prng_GetRandom(buffer, length));
22 if ((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClCss_Prng_GetRandom) != token) ||
23 (result != MCUXCLCSS_STATUS_OK)) {
24 status = -EAGAIN;
25 }
26 MCUX_CSSL_FP_FUNCTION_CALL_END();
27
28 __ASSERT_NO_MSG(!status);
29
30 return status;
31 }
32
33 static const struct entropy_driver_api entropy_mcux_css_api_funcs = {
34 .get_entropy = entropy_mcux_css_get_entropy
35 };
36
entropy_mcux_css_init(const struct device * dev)37 static int entropy_mcux_css_init(const struct device *dev)
38 {
39 ARG_UNUSED(dev);
40 uint8_t status = 0;
41
42 MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(result, token, mcuxClCss_Enable_Async());
43 if ((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClCss_Enable_Async) != token) ||
44 (result != MCUXCLCSS_STATUS_OK_WAIT)) {
45 status = -ENODEV;
46 }
47 MCUX_CSSL_FP_FUNCTION_CALL_END();
48
49 __ASSERT_NO_MSG(!status);
50
51 return status;
52 }
53
54 DEVICE_DT_INST_DEFINE(0, entropy_mcux_css_init, NULL, NULL, NULL, PRE_KERNEL_1,
55 CONFIG_ENTROPY_INIT_PRIORITY, &entropy_mcux_css_api_funcs);
56
