[deliverable/linux.git] / arch / arm / mach-footbridge / dc21285-timer.c

/*
 *  linux/arch/arm/mach-footbridge/dc21285-timer.c
 *
 *  Copyright (C) 1998 Russell King.
 *  Copyright (C) 1998 Phil Blundell
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/irq.h>

#include <asm/hardware/dec21285.h>
#include <asm/mach/time.h>

#include "common.h"

/*
 * Footbridge timer 1 support.
 */
static unsigned long timer1_latch;

static unsigned long timer1_gettimeoffset (void)
{
	unsigned long value = timer1_latch - *CSR_TIMER1_VALUE;

	return ((tick_nsec / 1000) * value) / timer1_latch;
}

static irqreturn_t
timer1_interrupt(int irq, void *dev_id)
{
	*CSR_TIMER1_CLR = 0;

	timer_tick();

	return IRQ_HANDLED;
}

static struct irqaction footbridge_timer_irq = {
	.name		= "Timer1 timer tick",
	.handler	= timer1_interrupt,
	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
};

/*
 * Set up timer interrupt.
 */
static void __init footbridge_timer_init(void)
{
	timer1_latch = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);

	*CSR_TIMER1_CLR  = 0;
	*CSR_TIMER1_LOAD = timer1_latch;
	*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;

	setup_irq(IRQ_TIMER1, &footbridge_timer_irq);

	isa_rtc_init();
}

struct sys_timer footbridge_timer = {
	.init		= footbridge_timer_init,
	.offset		= timer1_gettimeoffset,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/mach-footbridge/dc21285-timer.c
	3	*
	4	* Copyright (C) 1998 Russell King.
	5	* Copyright (C) 1998 Phil Blundell
	6	*/
	7	#include <linux/init.h>
	8	#include <linux/interrupt.h>
55e86989	9	#include <linux/irq.h>
1da177e4 LT	10
	11	#include <asm/irq.h>
	12
	13	#include <asm/hardware/dec21285.h>
	14	#include <asm/mach/time.h>
	15
	16	#include "common.h"
	17
	18	/*
	19	* Footbridge timer 1 support.
	20	*/
	21	static unsigned long timer1_latch;
	22
	23	static unsigned long timer1_gettimeoffset (void)
	24	{
	25	unsigned long value = timer1_latch - *CSR_TIMER1_VALUE;
	26
	27	return ((tick_nsec / 1000) * value) / timer1_latch;
	28	}
	29
	30	static irqreturn_t
0cd61b68	31	timer1_interrupt(int irq, void *dev_id)
1da177e4	32	{
1da177e4 LT	33	*CSR_TIMER1_CLR = 0;
1da177e4 LT	34
0cd61b68	35	timer_tick();
1da177e4	36
1da177e4 LT	37	return IRQ_HANDLED;
	38	}
	39
	40	static struct irqaction footbridge_timer_irq = {
	41	.name = "Timer1 timer tick",
	42	.handler = timer1_interrupt,
b30fabad	43	.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_IRQPOLL,
1da177e4 LT	44	};
	45
	46	/*
	47	* Set up timer interrupt.
	48	*/
	49	static void __init footbridge_timer_init(void)
	50	{
1da177e4 LT	51	timer1_latch = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);
	52
	53	*CSR_TIMER1_CLR = 0;
	54	*CSR_TIMER1_LOAD = timer1_latch;
	55	*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE \| TIMER_CNTL_AUTORELOAD \| TIMER_CNTL_DIV16;
	56
	57	setup_irq(IRQ_TIMER1, &footbridge_timer_irq);
336eb02b RK	58
336eb02b RK	59	isa_rtc_init();
1da177e4 LT	60	}
	61
	62	struct sys_timer footbridge_timer = {
	63	.init = footbridge_timer_init,
	64	.offset = timer1_gettimeoffset,
	65	};