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Commit 2a6f9902 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King
Browse files

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



Patch from Andrew Victor

Added suspend/resume support for the AT91RM9200 timer.

Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 963151f2

arch/arm/mach-at91rm9200/time.c

+30 −14
Original line number Diff line number Diff line
@@ -90,6 +90,20 @@ static struct irqaction at91rm9200_timer_irq = { 
	.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.

 */
@@ -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);

	(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);



	/* 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) */

	tick_usec = (LATCH * 1000000) / CLOCK_TICK_RATE;



	/* Enable Period Interval Timer interrupt */

	at91_sys_write(AT91_ST_IER, AT91_ST_PITS);

	/* Initialize and enable the timer interrupt */

	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 = {

	.init		= at91rm9200_timer_init,

	.offset		= at91rm9200_gettimeoffset,

	.suspend	= at91rm9200_timer_suspend,

	.resume		= at91rm9200_timer_reset,

};