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