1 /*
2 * Copyright (c) 2021 Safran Passenger Innovations Germany GmbH
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT silabs_gecko_semailbox
8
9 #include <zephyr/drivers/entropy.h>
10 #include <soc.h>
11 #include "em_cmu.h"
12 #include "sl_se_manager.h"
13 #include "sl_se_manager_entropy.h"
14
15
entropy_gecko_se_get_entropy(const struct device * dev,uint8_t * buffer,uint16_t length)16 static int entropy_gecko_se_get_entropy(const struct device *dev,
17 uint8_t *buffer,
18 uint16_t length)
19 {
20 ARG_UNUSED(dev);
21
22 int err = 0;
23 sl_status_t status;
24 sl_se_command_context_t cmd_ctx;
25
26 status = sl_se_init_command_context(&cmd_ctx);
27
28 if (status == SL_STATUS_OK) {
29 status = sl_se_get_random(&cmd_ctx, buffer, length);
30
31 if (status != SL_STATUS_OK) {
32 err = -EIO;
33 }
34
35 sl_se_deinit_command_context(&cmd_ctx);
36 } else {
37 err = -EIO;
38 }
39
40 return err;
41 }
42
entropy_gecko_se_get_entropy_isr(const struct device * dev,uint8_t * buf,uint16_t len,uint32_t flags)43 static int entropy_gecko_se_get_entropy_isr(const struct device *dev,
44 uint8_t *buf,
45 uint16_t len, uint32_t flags)
46 {
47 return -ENOTSUP;
48 }
49
entropy_gecko_se_init(const struct device * dev)50 static int entropy_gecko_se_init(const struct device *dev)
51 {
52 if (sl_se_init()) {
53 return -EIO;
54 }
55
56 return 0;
57 }
58
59 static const struct entropy_driver_api entropy_gecko_se_api_funcs = {
60 .get_entropy = entropy_gecko_se_get_entropy,
61 .get_entropy_isr = entropy_gecko_se_get_entropy_isr
62 };
63
64 #define GECKO_SE_INIT(n) \
65 DEVICE_DT_INST_DEFINE(n, \
66 entropy_gecko_se_init, NULL, \
67 NULL, NULL, \
68 PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY, \
69 &entropy_gecko_se_api_funcs); \
70
71 DT_INST_FOREACH_STATUS_OKAY(GECKO_SE_INIT)
72
