2 * watchdog.c - driver for i.mx on-chip watchdog
4 * Licensed under the GPL-2 or later.
10 #include <asm/arch/imx-regs.h>
13 #ifdef CONFIG_IMX_WATCHDOG
14 void hw_watchdog_reset(void)
16 struct watchdog_regs
*wdog
= (struct watchdog_regs
*)WDOG1_BASE_ADDR
;
18 writew(0x5555, &wdog
->wsr
);
19 writew(0xaaaa, &wdog
->wsr
);
22 void hw_watchdog_init(void)
24 struct watchdog_regs
*wdog
= (struct watchdog_regs
*)WDOG1_BASE_ADDR
;
28 * The timer watchdog can be set between
29 * 0.5 and 128 Seconds. If not defined
30 * in configuration file, sets 128 Seconds
32 #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
33 #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
35 timeout
= (CONFIG_WATCHDOG_TIMEOUT_MSECS
/ 500) - 1;
36 writew(WCR_WDZST
| WCR_WDBG
| WCR_WDE
| WCR_WDT
| WCR_SRS
|
37 SET_WCR_WT(timeout
), &wdog
->wcr
);
42 void reset_cpu(ulong addr
)
44 struct watchdog_regs
*wdog
= (struct watchdog_regs
*)WDOG1_BASE_ADDR
;
46 clrsetbits_le16(&wdog
->wcr
, 0, WCR_WDE
);
48 writew(0x5555, &wdog
->wsr
);
49 writew(0xaaaa, &wdog
->wsr
); /* load minimum 1/2 second timeout */
52 * spin for .5 seconds before reset