1/*
2 * linux/arch/arm/mach-h720x/cpu-h7201.c
3 *
4 * Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
5 *               2003 Robert Schwebel <r.schwebel@pengutronix.de>
6 *               2004 Sascha Hauer    <s.hauer@pengutronix.de>
7 *
8 * processor specific stuff for the Hynix h7201
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/module.h>
19#include <asm/types.h>
20#include <asm/hardware.h>
21#include <asm/irq.h>
22#include <asm/arch/irqs.h>
23#include <asm/mach/irq.h>
24#include <asm/mach/time.h>
25#include "common.h"
26/*
27 * Timer interrupt handler
28 */
29static irqreturn_t
30h7201_timer_interrupt(int irq, void *dev_id)
31{
32	write_seqlock(&xtime_lock);
33
34	CPU_REG (TIMER_VIRT, TIMER_TOPSTAT);
35	timer_tick();
36
37	write_sequnlock(&xtime_lock);
38
39	return IRQ_HANDLED;
40}
41
42static struct irqaction h7201_timer_irq = {
43	.name		= "h7201 Timer Tick",
44	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
45	.handler	= h7201_timer_interrupt,
46};
47
48/*
49 * Setup TIMER0 as system timer
50 */
51void __init h7201_init_time(void)
52{
53	CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
54	CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
55	CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;
56	CPU_REG (TIMER_VIRT, TIMER_TOPCTRL) = ENABLE_TM0_INTR | TIMER_ENABLE_BIT;
57
58	setup_irq(IRQ_TIMER0, &h7201_timer_irq);
59}
60
61struct sys_timer h7201_timer = {
62	.init		= h7201_init_time,
63	.offset		= h720x_gettimeoffset,
64};
65