Hi Sweta,
here is the code from the 2.6.19 kernel. Maybe this helps :
void davinci_watchdog_reset(void) {
volatile davinci_timer_regs_t *davinci_wdt =
(volatile davinci_timer_regs_t *)IO_ADDRESS(DAVINCI_WDOG_BASE);
davinci_wdt->tcr = 0x0; /* disable timer */
davinci_wdt->tgcr = 0x0; /* reset timer */
davinci_wdt->tgcr = 0x8; /* configure timer2 as 64-bit */
davinci_wdt->tgcr |= 0x3; /* release timer from reset */
davinci_wdt->tim12 = 0; /* clear counter and period regs */
davinci_wdt->tim34 = 0;
davinci_wdt->prd12 = 0;
davinci_wdt->prd34 = 0;
davinci_wdt->wdtcr |= 0x4000; /* enable watchdog timer */
/* put watchdog in pre-active state */
davinci_wdt->wdtcr = 0xA5C64000;
/* put watchdog in active state */
davinci_wdt->wdtcr = 0xDA7E4000;
/* write an invalid value to the WDKEY field to trigger
* a watchdog reset */
davinci_wdt->wdtcr = 0x00004000;
}
On Fri, 29 Dec 2006, [EMAIL PROTECTED] wrote:
> Hi Peter,
> I m using Montavista Linux 2.6.10 (mvl402).
> reboot code as mentioned in mail is executed properly.but then after
> this line davinci_wdt->wdtcr = 0x00004000;, it doesn't execute next
> statement (I tried with putting printk statement after it).
> Doe it mean that it resets watchdog correctly.
> But then it doesn't reset the processor & doesn't start execution of UBL
> code again.
> What can be the problem ?
> Thanks,
> Sweta
> >
> >
> > Hi Sweta,
> >
> > which kernel are you using ?? It works with the 2.6.19 Kernel from GIT
> > tree.
> >
> > Ciao,
> >
> > Peter
> >
> > On Thu, 28 Dec 2006, [EMAIL PROTECTED] wrote:
> >
> >> Hi All,
> >> I want to reset the Davinci pocessor using watchdog timer.
> >> So when I give reboot command from kernel, it hangs & doesn't actually
> >> reset the processor.
> >> code for watchdog rest in kernel is as follows :
> >> void davinci_watchdog_reset(void) {
> >> volatile davinci_timer_regs_t *davinci_wdt = (volatile
> >> davinci_timer_regs_t *)IO_ADDRESS(DAVINCI_WDOG_BASE);
> >> davinci_wdt->tcr = 0x0; /* disable timer */
> >> davinci_wdt->tgcr = 0x0; /* reset timer */
> >> davinci_wdt->tgcr = 0x8; /* configure timer2 as 64-bit */
> >> davinci_wdt->tgcr |= 0x3; /* release timer from reset */
> >> davinci_wdt->tim12 = 0; /* clear counter and period regs
> >> */
> >> davinci_wdt->tim34 = 0;
> >> davinci_wdt->prd12 = 0;
> >> davinci_wdt->prd34 = 0;
> >> davinci_wdt->tcr |= 0x00000040;
> >> davinci_wdt->wdtcr |= 0x4000; /* enable watchdog timer */
> >>
> >> *(volatile unsigned int *)(0x01c41a20) = 0x00000000;
> >>
> >> /* put watchdog in pre-active state */
> >> davinci_wdt->wdtcr = 0xA5C64000;
> >>
> >> /* put watchdog in active state */
> >> davinci_wdt->wdtcr = 0xDA7E4000;
> >>
> >> /* write an invalid value to the WDKEY field to trigger* a
> >> watchdog
> >> reset */
> >> davinci_wdt->wdtcr = 0x00004000;
> >>
> >> }
> >>
> >> But it hangs & doesn't actually reset the processor.
> >> I tried with reset commnad from u-boot loader also. It also gives me the
> >> same result.
> >> Can anyone Help me out to debug what is wrong ?
> >>
> >> Thanks in advance,
> >> -Sweta
> >>
>
>
>
>
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