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79 lines
1.7 KiB
79 lines
1.7 KiB
20 years ago
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/*
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* linux/arch/arm/mach-epxa10db/time.c
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*
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* Copyright (C) 2000 Deep Blue Solutions
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* Copyright (C) 2001 Altera Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <asm/hardware.h>
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#include <asm/system.h>
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#include <asm/leds.h>
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#include <asm/mach/time.h>
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#define TIMER00_TYPE (volatile unsigned int*)
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#include <asm/arch/timer00.h>
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static int epxa10db_set_rtc(void)
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{
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return 1;
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}
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static int epxa10db_rtc_init(void)
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{
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set_rtc = epxa10db_set_rtc;
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return 0;
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}
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__initcall(epxa10db_rtc_init);
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/*
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* IRQ handler for the timer
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*/
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static irqreturn_t
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epxa10db_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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write_seqlock(&xtime_lock);
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// ...clear the interrupt
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*TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))|=TIMER0_CR_CI_MSK;
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timer_tick(regs);
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write_sequnlock(&xtime_lock);
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return IRQ_HANDLED;
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}
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static struct irqaction epxa10db_timer_irq = {
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.name = "Excalibur Timer Tick",
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.flags = SA_INTERRUPT,
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.handler = epxa10db_timer_interrupt
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};
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/*
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* Set up timer interrupt, and return the current time in seconds.
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*/
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static void __init epxa10db_timer_init(void)
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{
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/* Start the timer */
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*TIMER0_LIMIT(IO_ADDRESS(EXC_TIMER00_BASE))=(unsigned int)(EXC_AHB2_CLK_FREQUENCY/200);
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*TIMER0_PRESCALE(IO_ADDRESS(EXC_TIMER00_BASE))=1;
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*TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))=TIMER0_CR_IE_MSK | TIMER0_CR_S_MSK;
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setup_irq(IRQ_TIMER0, &epxa10db_timer_irq);
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}
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struct sys_timer epxa10db_timer = {
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.init = epxa10db_timer_init,
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};
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