1/*
2 *  arch/arm/mach-lh7a40x/time.c
3 *
4 *  Copyright (C) 2004 Logic Product Development
5 *
6 *  This program is free software; you can redistribute it and/or
7 *  modify it under the terms of the GNU General Public License
8 *  version 2 as published by the Free Software Foundation.
9 *
10 */
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/interrupt.h>
14#include <linux/irq.h>
15#include <linux/time.h>
16
17#include <asm/hardware.h>
18#include <asm/io.h>
19#include <asm/irq.h>
20#include <asm/leds.h>
21
22#include <asm/mach/time.h>
23#include "common.h"
24
25#if HZ < 100
26# define TIMER_CONTROL	TIMER_CONTROL2
27# define TIMER_LOAD	TIMER_LOAD2
28# define TIMER_CONSTANT	(508469/HZ)
29# define TIMER_MODE	(TIMER_C_ENABLE | TIMER_C_PERIODIC | TIMER_C_508KHZ)
30# define TIMER_EOI	TIMER_EOI2
31# define TIMER_IRQ	IRQ_T2UI
32#else
33# define TIMER_CONTROL	TIMER_CONTROL3
34# define TIMER_LOAD	TIMER_LOAD3
35# define TIMER_CONSTANT	(3686400/HZ)
36# define TIMER_MODE	(TIMER_C_ENABLE | TIMER_C_PERIODIC)
37# define TIMER_EOI	TIMER_EOI3
38# define TIMER_IRQ	IRQ_T3UI
39#endif
40
41static irqreturn_t
42lh7a40x_timer_interrupt(int irq, void *dev_id)
43{
44	write_seqlock(&xtime_lock);
45
46	TIMER_EOI = 0;
47	timer_tick();
48
49	write_sequnlock(&xtime_lock);
50
51	return IRQ_HANDLED;
52}
53
54static struct irqaction lh7a40x_timer_irq = {
55	.name		= "LHA740x Timer Tick",
56	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
57	.handler	= lh7a40x_timer_interrupt,
58};
59
60static void __init lh7a40x_timer_init (void)
61{
62				/* Stop/disable all timers */
63	TIMER_CONTROL1 = 0;
64	TIMER_CONTROL2 = 0;
65	TIMER_CONTROL3 = 0;
66
67	setup_irq (TIMER_IRQ, &lh7a40x_timer_irq);
68
69	TIMER_LOAD = TIMER_CONSTANT;
70	TIMER_CONTROL = TIMER_MODE;
71}
72
73struct sys_timer lh7a40x_timer = {
74	.init		= &lh7a40x_timer_init,
75};
76