83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
/*
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* linux/arch/h8300/kernel/timer/itu.c
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*
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* Yoshinori Sato <ysato@users.sourcefoge.jp>
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*
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* ITU 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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#if CONFIG_H8300_ITU_CH == 0
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#define ITUBASE 0xffff64
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#define ITUIRQ 24
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#elif CONFIG_H8300_ITU_CH == 1
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#define ITUBASE 0xffff6e
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#define ITUIRQ 28
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#elif CONFIG_H8300_ITU_CH == 2
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#define ITUBASE 0xffff78
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#define ITUIRQ 32
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#elif CONFIG_H8300_ITU_CH == 3
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#define ITUBASE 0xffff82
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#define ITUIRQ 36
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#elif CONFIG_H8300_ITU_CH == 4
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#define ITUBASE 0xffff92
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#define ITUIRQ 40
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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 TIER 2
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#define TSR 3
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#define TCNT 4
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#define GRA 6
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#define GRB 8
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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(IMFA, ITUBASE + TSR);
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return IRQ_HANDLED;
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}
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static struct irqaction itu_irq = {
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.name = "itu",
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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(ITUIRQ, &itu_irq);
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/* initalize timer */
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ctrl_outb(0, TSTR);
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ctrl_outb(CCLR0 | div, ITUBASE + TCR);
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ctrl_outb(0x01, ITUBASE + TIER);
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ctrl_outw(cnt, ITUBASE + GRA);
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ctrl_bset(CONFIG_H8300_ITU_CH, TSTR);
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}
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