1 /****************************************************************************
2 * boot/nuttx/src/watchdog/watchdog.c
3 *
4 * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 ****************************************************************************/
19
20 /****************************************************************************
21 * Included Files
22 ****************************************************************************/
23
24 #include "watchdog/watchdog.h"
25
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <unistd.h>
29 #include <sys/ioctl.h>
30
31 #include <nuttx/timers/watchdog.h>
32
33 #include <bootutil/bootutil_log.h>
34
35 /****************************************************************************
36 * Public Functions
37 ****************************************************************************/
38
39 /****************************************************************************
40 * Name: mcuboot_watchdog_feed
41 *
42 * Description:
43 * Reset the watchdog timer to the current timeout value, preventing any
44 * imminent watchdog timeouts.
45 *
46 * Input Parameters:
47 * None.
48 *
49 * Returned Value:
50 * None.
51 *
52 ****************************************************************************/
53
mcuboot_watchdog_feed(void)54 void mcuboot_watchdog_feed(void)
55 {
56 int fd;
57 int ret;
58
59 fd = open(CONFIG_MCUBOOT_WATCHDOG_DEVPATH, O_RDONLY);
60 if (fd < 0)
61 {
62 BOOT_LOG_ERR("Failed to open %s", CONFIG_MCUBOOT_WATCHDOG_DEVPATH);
63
64 return;
65 }
66
67 ret = ioctl(fd, WDIOC_KEEPALIVE, 0);
68 if (ret < 0)
69 {
70 int errcode = errno;
71
72 BOOT_LOG_ERR("Failed to ping watchdog device: %d", errcode);
73 }
74
75 close(fd);
76 }
77
78 /****************************************************************************
79 * Name: mcuboot_watchdog_init
80 *
81 * Description:
82 * Initialize the watchdog timer by setting the trigger timeout and
83 * starting it.
84 *
85 * Input Parameters:
86 * None.
87 *
88 * Returned Value:
89 * OK on success, ERROR if not.
90 *
91 ****************************************************************************/
92
mcuboot_watchdog_init(void)93 int mcuboot_watchdog_init(void)
94 {
95 int fd;
96 int ret;
97
98 fd = open(CONFIG_MCUBOOT_WATCHDOG_DEVPATH, O_RDONLY);
99 if (fd < 0)
100 {
101 BOOT_LOG_ERR("Failed to open %s", CONFIG_MCUBOOT_WATCHDOG_DEVPATH);
102 goto errout;
103 }
104
105 ret = ioctl(fd, WDIOC_SETTIMEOUT, (unsigned long)CONFIG_MCUBOOT_WATCHDOG_TIMEOUT);
106 if (ret < 0)
107 {
108 int errcode = errno;
109
110 BOOT_LOG_ERR("Failed to set timeout in watchdog device: %d", errcode);
111 goto errout_with_dev;
112 }
113
114 ret = ioctl(fd, WDIOC_START, 0);
115 if (ret < 0)
116 {
117 int errcode = errno;
118
119 BOOT_LOG_ERR("Failed to start watchdog device: %d", errcode);
120 goto errout_with_dev;
121 }
122
123 close(fd);
124 return OK;
125
126 errout_with_dev:
127 close(fd);
128 errout:
129 return ERROR;
130 }
131
