summaryrefslogtreecommitdiff
path: root/drivers/watchdog/imx_watchdog.c
blob: 0d775956bff45fd52687676f16fc706788c2f6ff (plain)
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
/*
 * watchdog.c - driver for i.mx on-chip watchdog
 *
 * Licensed under the GPL-2 or later.
 */

#include <common.h>
#include <asm/io.h>
#include <watchdog.h>
#include <asm/arch/imx-regs.h>
#include <fsl_wdog.h>

#ifdef CONFIG_IMX_WATCHDOG
void hw_watchdog_reset(void)
{
	struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;

	writew(0x5555, &wdog->wsr);
	writew(0xaaaa, &wdog->wsr);
}

void hw_watchdog_init(void)
{
	struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
	u16 timeout;

	/*
	 * The timer watchdog can be set between
	 * 0.5 and 128 Seconds. If not defined
	 * in configuration file, sets 128 Seconds
	 */
#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
#define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
#endif
	timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
	writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
		SET_WCR_WT(timeout), &wdog->wcr);
	hw_watchdog_reset();
}
#endif

void reset_cpu(ulong addr)
{
	struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;

	clrsetbits_le16(&wdog->wcr, 0, WCR_WDE);

	writew(0x5555, &wdog->wsr);
	writew(0xaaaa, &wdog->wsr);	/* load minimum 1/2 second timeout */
	while (1) {
		/*
		 * spin for .5 seconds before reset
		 */
	}
}