1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
#include <common.h>
#include <dm.h>
#include <os.h>
#include <wdt.h>
struct alarm_wdt_priv {
unsigned int timeout_sec;
};
static void alarm_handler(int sig)
{
const char *msg = "!!! ALARM !!!\n";
os_write(2, msg, strlen(msg));
os_fd_restore();
os_set_alarm_handler(NULL);
os_raise_sigalrm();
}
static int alarm_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
{
struct alarm_wdt_priv *priv = dev_get_priv(dev);
unsigned int sec;
timeout = DIV_ROUND_UP(timeout, 1000);
sec = min_t(u64, UINT_MAX, timeout);
priv->timeout_sec = sec;
os_alarm(0);
os_set_alarm_handler(alarm_handler);
os_alarm(sec);
return 0;
}
static int alarm_wdt_stop(struct udevice *dev)
{
os_alarm(0);
os_set_alarm_handler(NULL);
return 0;
}
static int alarm_wdt_reset(struct udevice *dev)
{
struct alarm_wdt_priv *priv = dev_get_priv(dev);
os_alarm(priv->timeout_sec);
return 0;
}
static int alarm_wdt_expire_now(struct udevice *dev, ulong flags)
{
alarm_handler(0);
return 0;
}
static const struct wdt_ops alarm_wdt_ops = {
.start = alarm_wdt_start,
.reset = alarm_wdt_reset,
.stop = alarm_wdt_stop,
.expire_now = alarm_wdt_expire_now,
};
static const struct udevice_id alarm_wdt_ids[] = {
{ .compatible = "sandbox,alarm-wdt" },
{}
};
U_BOOT_DRIVER(alarm_wdt_sandbox) = {
.name = "alarm_wdt_sandbox",
.id = UCLASS_WDT,
.of_match = alarm_wdt_ids,
.ops = &alarm_wdt_ops,
.priv_auto = sizeof(struct alarm_wdt_priv),
};
|
