78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
|
|
* 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 __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(_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);
|
|
}
|