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tpu.c

/*
 *  linux/arch/h8300/kernel/timer/tpu.c
 *
 *  Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 *  TPU 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/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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