imx_watchdog.c
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/*
* 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>
#include <asm/arch/sys_proto.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 |
WCR_WDA | SET_WCR_WT(timeout), &wdog->wcr);
hw_watchdog_reset();
}
#endif
void __attribute__((weak)) reset_cpu(ulong addr)
{
struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
if ((is_cpu_type(MXC_CPU_MX7D) || is_cpu_type(MXC_CPU_MX7S)))
clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, (WCR_WDE | WCR_SRS));
else
clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, WCR_WDE);
writew(0x5555, &wdog->wsr);
writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */
while (1) {
/*
* spin for .5 seconds before reset
*/
}
}