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/*
* linux/arch/h8300/kernel/timer/itu.c
*
* Yoshinori Sato <ysato@users.sourcefoge.jp>
*
* ITU 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>
#if CONFIG_H8300_ITU_CH == 0
#define ITUBASE 0xffff64
#define ITUIRQ 24
#elif CONFIG_H8300_ITU_CH == 1
#define ITUBASE 0xffff6e
#define ITUIRQ 28
#elif CONFIG_H8300_ITU_CH == 2
#define ITUBASE 0xffff78
#define ITUIRQ 32
#elif CONFIG_H8300_ITU_CH == 3
#define ITUBASE 0xffff82
#define ITUIRQ 36
#elif CONFIG_H8300_ITU_CH == 4
#define ITUBASE 0xffff92
#define ITUIRQ 40
#else
#error Unknown timer channel.
#endif
#define TCR 0
#define TIOR 1
#define TIER 2
#define TSR 3
#define TCNT 4
#define GRA 6
#define GRB 8
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
h8300_timer_tick();
ctrl_bclr(IMFA, ITUBASE + TSR);
return IRQ_HANDLED;
}
static struct irqaction itu_irq = {
.name = "itu",
.handler = timer_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER,
.mask = CPU_MASK_NONE,
};
static const int __initdata 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(ITUIRQ, &itu_irq);
/* initalize timer */
ctrl_outb(0, TSTR);
ctrl_outb(CCLR0 | div, ITUBASE + TCR);
ctrl_outb(0x01, ITUBASE + TIER);
ctrl_outw(cnt, ITUBASE + GRA);
ctrl_bset(CONFIG_H8300_ITU_CH, TSTR);
}
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