78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
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/*
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* linux/arch/h8300/kernel/timer/timer16.c
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*
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* Yoshinori Sato <ysato@users.sourcefoge.jp>
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*
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* 16bit Timer Handler
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*
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/timex.h>
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#include <asm/segment.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/regs306x.h>
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/* 16bit timer */
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#if CONFIG_H8300_TIMER16_CH == 0
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#define _16BASE 0xffff78
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#define _16IRQ 24
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#elif CONFIG_H8300_TIMER16_CH == 1
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#define _16BASE 0xffff80
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#define _16IRQ 28
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#elif CONFIG_H8300_TIMER16_CH == 2
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#define _16BASE 0xffff88
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#define _16IRQ 32
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#else
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#error Unknown timer channel.
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#endif
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#define TCR 0
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#define TIOR 1
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#define TCNT 2
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#define GRA 4
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#define GRB 6
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#define H8300_TIMER_FREQ CONFIG_CPU_CLOCK*10000 /* Timer input freq. */
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static irqreturn_t timer_interrupt(int irq, void *dev_id)
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{
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h8300_timer_tick();
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ctrl_bclr(CONFIG_H8300_TIMER16_CH, TISRA);
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return IRQ_HANDLED;
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}
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static struct irqaction timer16_irq = {
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.name = "timer-16",
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.handler = timer_interrupt,
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.flags = IRQF_DISABLED | IRQF_TIMER,
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};
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static const int __initdata divide_rate[] = {1, 2, 4, 8};
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void __init h8300_timer_setup(void)
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{
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unsigned int div;
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unsigned int cnt;
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calc_param(cnt, div, divide_rate, 0x10000);
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setup_irq(_16IRQ, &timer16_irq);
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/* initalize timer */
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ctrl_outb(0, TSTR);
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ctrl_outb(CCLR0 | div, _16BASE + TCR);
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ctrl_outw(cnt, _16BASE + GRA);
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ctrl_bset(4 + CONFIG_H8300_TIMER16_CH, TISRA);
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ctrl_bset(CONFIG_H8300_TIMER16_CH, TSTR);
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}
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