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/*
* linux/arch/h8300/kernel/cpu/timer/timer8.c
*
* Yoshinori Sato <ysato@users.sourcefoge.jp>
*
* 8bit 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/profile.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/timer.h>
#if defined(CONFIG_CPU_H8300H)
#include <asm/regs306x.h>
#endif
#if defined(CONFIG_CPU_H8S)
#include <asm/regs267x.h>
#endif
/* 8bit timer x2 */
#define CMFA 6
#if defined(CONFIG_H8300_TIMER8_CH0)
#define _8BASE _8TCR0
#ifdef CONFIG_CPU_H8300H
#define _8IRQ 36
#endif
#ifdef CONFIG_CPU_H8S
#define _8IRQ 72
#endif
#elif defined(CONFIG_H8300_TIMER8_CH2)
#ifdef CONFIG_CPU_H8300H
#define _8BASE _8TCR2
#define _8IRQ 40
#endif
#endif
#ifndef _8BASE
#error Unknown timer channel.
#endif
#define _8TCR 0
#define _8TCSR 2
#define TCORA 4
#define TCORB 6
#define _8TCNT 8
#define CMIEA 0x40
#define CCLR_CMA 0x08
#define CKS2 0x04
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
*/
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
h8300_timer_tick();
ctrl_bclr(CMFA, _8BASE + _8TCSR);
return IRQ_HANDLED;
}
static struct irqaction timer8_irq = {
.name = "timer-8",
.handler = timer_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER,
.mask = CPU_MASK_NONE,
};
static const int __initdata divide_rate[] = {8, 64, 8192};
void __init h8300_timer_setup(void)
{
unsigned int div;
unsigned int cnt;
calc_param(cnt, div, divide_rate, 0x10000);
div++;
setup_irq(_8IRQ, &timer8_irq);
#if defined(CONFIG_CPU_H8S)
/* Timer module enable */
ctrl_bclr(0, MSTPCRL)
#endif
/* initalize timer */
ctrl_outw(cnt, _8BASE + TCORA);
ctrl_outw(0x0000, _8BASE + _8TCSR);
ctrl_outw((CMIEA|CCLR_CMA|CKS2) << 8 | div,
_8BASE + _8TCR);
}
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