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[ARM] 3580/1: AT91RM9200 Timer suspend/resume support

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Patch from Andrew Victor

Added suspend/resume support for the AT91RM9200 timer.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor 2006-06-19 15:26:50 +01:00 • committed by Russell King
parent 963151f247
commit 2a6f9902c6
1 changed files with 30 additions and 14 deletions
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44
arch/arm/mach-at91rm9200/time.c
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@ -90,6 +90,20 @@ static struct irqaction at91rm9200_timer_irq = {
.handler = at91rm9200_timer_interrupt .handler = at91rm9200_timer_interrupt
}; };
void at91rm9200_timer_reset(void)
{
last_crtr = 0;
/* Real time counter incremented every 30.51758 microseconds */
at91_sys_write(AT91_ST_RTMR, 1);
/* Set Period Interval timer */
at91_sys_write(AT91_ST_PIMR, LATCH);
/* Enable Period Interval Timer interrupt */
at91_sys_write(AT91_ST_IER, AT91_ST_PITS);
}
/* /*
* Set up timer interrupt. * Set up timer interrupt.
*/ */
@ -99,28 +113,30 @@ void __init at91rm9200_timer_init(void)
at91_sys_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS); at91_sys_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
(void) at91_sys_read(AT91_ST_SR); /* Clear any pending interrupts */ (void) at91_sys_read(AT91_ST_SR); /* Clear any pending interrupts */
/* /* Make IRQs happen for the system timer */
* Make IRQs happen for the system timer.
*/
setup_irq(AT91_ID_SYS, &at91rm9200_timer_irq); setup_irq(AT91_ID_SYS, &at91rm9200_timer_irq);
/* Set initial alarm to 0 */
at91_sys_write(AT91_ST_RTAR, 0);
/* Real time counter incremented every 30.51758 microseconds */
at91_sys_write(AT91_ST_RTMR, 1);
/* Set Period Interval timer */
at91_sys_write(AT91_ST_PIMR, LATCH);
/* Change the kernel's 'tick' value to 10009 usec. (the default is 10000) */ /* Change the kernel's 'tick' value to 10009 usec. (the default is 10000) */
tick_usec = (LATCH * 1000000) / CLOCK_TICK_RATE; tick_usec = (LATCH * 1000000) / CLOCK_TICK_RATE;
/* Enable Period Interval Timer interrupt */ /* Initialize and enable the timer interrupt */
at91_sys_write(AT91_ST_IER, AT91_ST_PITS); at91rm9200_timer_reset();
} }
#ifdef CONFIG_PM
static void at91rm9200_timer_suspend(void)
{
/* disable Period Interval Timer interrupt */
at91_sys_write(AT91_ST_IDR, AT91_ST_PITS);
}
#else
#define at91rm9200_timer_suspend NULL
#endif
struct sys_timer at91rm9200_timer = { struct sys_timer at91rm9200_timer = {
.init = at91rm9200_timer_init, .init = at91rm9200_timer_init,
.offset = at91rm9200_gettimeoffset, .offset = at91rm9200_gettimeoffset,
.suspend = at91rm9200_timer_suspend,
.resume = at91rm9200_timer_reset,
}; };