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/*
* linux/arch/h8300/kernel/timer/tpu.c
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
* TPU Timer Handler
*
*/
#include <linux/config.h>
#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/regs267x.h>
/* TPU */
#if CONFIG_H8300_TPU_CH == 0
#define TPUBASE 0xffffd0
#define TPUIRQ 40
#elif CONFIG_H8300_TPU_CH == 1
#define TPUBASE 0xffffe0
#define TPUIRQ 48
#elif CONFIG_H8300_TPU_CH == 2
#define TPUBASE 0xfffff0
#define TPUIRQ 52
#elif CONFIG_H8300_TPU_CH == 3
#define TPUBASE 0xfffe80
#define TPUIRQ 56
#elif CONFIG_H8300_TPU_CH == 4
#define TPUBASE 0xfffe90
#define TPUIRQ 64
#else
#error Unknown timer channel.
#endif
#define _TCR 0
#define _TMDR 1
#define _TIOR 2
#define _TIER 4
#define _TSR 5
#define _TCNT 6
#define _GRA 8
#define _GRB 10
#define CCLR0 0x20
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
h8300_timer_tick();
ctrl_bclr(0, TPUBASE + _TSR);
return IRQ_HANDLED;
}
static struct irqaction tpu_irq = {
.name = "tpu",
.handler = timer_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER,
};
static const int __initdata divide_rate[] = {
#if CONFIG_H8300_TPU_CH == 0
1,4,16,64,0,0,0,0,
#elif (CONFIG_H8300_TPU_CH == 1) || (CONFIG_H8300_TPU_CH == 5)
1,4,16,64,0,0,256,0,
#elif (CONFIG_H8300_TPU_CH == 2) || (CONFIG_H8300_TPU_CH == 4)
1,4,16,64,0,0,0,1024,
#elif CONFIG_H8300_TPU_CH == 3
1,4,16,64,0,1024,256,4096,
#endif
};
void __init h8300_timer_setup(void)
{
unsigned int cnt;
unsigned int div;
calc_param(cnt, div, divide_rate, 0x10000);
setup_irq(TPUIRQ, &tpu_irq);
/* TPU module enabled */
ctrl_bclr(3, MSTPCRH);
ctrl_outb(0, TSTR);
ctrl_outb(CCLR0 | div, TPUBASE + _TCR);
ctrl_outb(0, TPUBASE + _TMDR);
ctrl_outw(0, TPUBASE + _TIOR);
ctrl_outb(0x01, TPUBASE + _TIER);
ctrl_outw(cnt, TPUBASE + _GRA);
ctrl_bset(CONFIG_H8300_TPU_CH, TSTR);
}
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