[mirror_ubuntu-artful-kernel.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 <linux/spinlock.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>
70d13e08	10	#include <linux/spinlock.h>
1da177e4 LT	11
	12	#include <asm/irq.h>
	13
	14	#include <asm/hardware/dec21285.h>
	15	#include <asm/mach/time.h>
	16
	17	#include "common.h"
	18
	19	/*
	20	* Footbridge timer 1 support.
	21	*/
	22	static unsigned long timer1_latch;
	23
	24	static unsigned long timer1_gettimeoffset (void)
	25	{
	26	unsigned long value = timer1_latch - *CSR_TIMER1_VALUE;
	27
	28	return ((tick_nsec / 1000) * value) / timer1_latch;
	29	}
	30
	31	static irqreturn_t
0cd61b68	32	timer1_interrupt(int irq, void *dev_id)
1da177e4	33	{
1da177e4 LT	34	*CSR_TIMER1_CLR = 0;
1da177e4 LT	35
0cd61b68	36	timer_tick();
1da177e4	37
1da177e4 LT	38	return IRQ_HANDLED;
	39	}
	40
	41	static struct irqaction footbridge_timer_irq = {
	42	.name = "Timer1 timer tick",
	43	.handler = timer1_interrupt,
b30fabad	44	.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_IRQPOLL,
1da177e4 LT	45	};
	46
	47	/*
	48	* Set up timer interrupt.
	49	*/
	50	static void __init footbridge_timer_init(void)
	51	{
1da177e4 LT	52	timer1_latch = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);
	53
	54	*CSR_TIMER1_CLR = 0;
	55	*CSR_TIMER1_LOAD = timer1_latch;
	56	*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE \| TIMER_CNTL_AUTORELOAD \| TIMER_CNTL_DIV16;
	57
	58	setup_irq(IRQ_TIMER1, &footbridge_timer_irq);
336eb02b RK	59
336eb02b RK	60	isa_rtc_init();
1da177e4 LT	61	}
	62
	63	struct sys_timer footbridge_timer = {
	64	.init = footbridge_timer_init,
	65	.offset = timer1_gettimeoffset,
	66	};