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arm, davinci: add internal WDT support for AM1808 cpus 

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Paulraj Sandeep <s-paulraj@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Heiko Schocher 2011-09-14 19:44:02 +00:00 committed by Albert ARIBAUD
parent fbabac79d0
commit bf569ac8d9
2 changed files with 35 additions and 0 deletions
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31
arch/arm/cpu/arm926ejs/davinci/timer.c
View File

@ -108,3 +108,34 @@ ulong get_tbclk(void)
{
return CONFIG_SYS_HZ;
}
#ifdef CONFIG_HW_WATCHDOG
static struct davinci_timer * const wdttimer =
(struct davinci_timer *)CONFIG_SYS_WDTTIMERBASE;
/*
* See prufw2.pdf for using Timer as a WDT
*/
void davinci_hw_watchdog_enable(void)
{
writel(0x0, &wdttimer->tcr);
writel(0x0, &wdttimer->tgcr);
/* TIMMODE = 2h */
writel(0x08 | 0x03 | ((TIM_CLK_DIV - 1) << 8), &wdttimer->tgcr);
writel(CONFIG_SYS_WDT_PERIOD_LOW, &wdttimer->prd12);
writel(CONFIG_SYS_WDT_PERIOD_HIGH, &wdttimer->prd34);
writel(2 << 22, &wdttimer->tcr);
writel(0x0, &wdttimer->tim12);
writel(0x0, &wdttimer->tim34);
/* set WDEN bit, WDKEY 0xa5c6 */
writel(0xa5c64000, &wdttimer->wdtcr);
/* clear counter register */
writel(0xda7e4000, &wdttimer->wdtcr);
}
void davinci_hw_watchdog_reset(void)
{
writel(0xa5c64000, &wdttimer->wdtcr);
writel(0xda7e4000, &wdttimer->wdtcr);
}
#endif

4
arch/arm/include/asm/arch-davinci/timer_defs.h
View File

@ -37,4 +37,8 @@ struct davinci_timer {
u_int32_t wdtcr;
};
#ifdef CONFIG_HW_WATCHDOG
void davinci_hw_watchdog_enable(void);
void davinci_hw_watchdog_reset(void);
#endif
#endif /* _TIMER_DEFS_H_ */