arch/h8300/kernel/timer/tpu.c

   1 /*
   2  *  linux/arch/h8300/kernel/timer/tpu.c
   3  *
   4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  *  TPU Timer Handler
   7  *
   8  */
   9
  10 #include <linux/config.h>
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel.h>
  14 #include <linux/param.h>
  15 #include <linux/string.h>
  16 #include <linux/mm.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/init.h>
  19 #include <linux/timex.h>
  20
  21 #include <asm/segment.h>
  22 #include <asm/io.h>
  23 #include <asm/irq.h>
  24 #include <asm/regs267x.h>
  25
  26 /* TPU */
  27 #if CONFIG_H8300_TPU_CH == 0
  28 #define TPUBASE 0xffffd0
  29 #define TPUIRQ  40
  30 #elif CONFIG_H8300_TPU_CH == 1
  31 #define TPUBASE 0xffffe0
  32 #define TPUIRQ  48
  33 #elif CONFIG_H8300_TPU_CH == 2
  34 #define TPUBASE 0xfffff0
  35 #define TPUIRQ  52
  36 #elif CONFIG_H8300_TPU_CH == 3
  37 #define TPUBASE 0xfffe80
  38 #define TPUIRQ  56
  39 #elif CONFIG_H8300_TPU_CH == 4
  40 #define TPUBASE 0xfffe90
  41 #define TPUIRQ  64
  42 #else
  43 #error Unknown timer channel.
  44 #endif
  45
  46 #define _TCR    0
  47 #define _TMDR   1
  48 #define _TIOR   2
  49 #define _TIER   4
  50 #define _TSR    5
  51 #define _TCNT   6
  52 #define _GRA    8
  53 #define _GRB    10
  54
  55 #define CCLR0   0x20
  56
  57 static irqreturn_t timer_interrupt(int irq, void *dev_id)
  58 {
  59         h8300_timer_tick();
  60         ctrl_bclr(0, TPUBASE + _TSR);
  61         return IRQ_HANDLED;
  62 }
  63
  64 static struct irqaction tpu_irq = {
  65         .name           = "tpu",
  66         .handler        = timer_interrupt,
  67         .flags          = IRQF_DISABLED | IRQF_TIMER,
  68 };
  69
  70 static const int __initdata divide_rate[] = {
  71 #if CONFIG_H8300_TPU_CH == 0
  72         1,4,16,64,0,0,0,0,
  73 #elif (CONFIG_H8300_TPU_CH == 1) || (CONFIG_H8300_TPU_CH == 5)
  74         1,4,16,64,0,0,256,0,
  75 #elif (CONFIG_H8300_TPU_CH == 2) || (CONFIG_H8300_TPU_CH == 4)
  76         1,4,16,64,0,0,0,1024,
  77 #elif CONFIG_H8300_TPU_CH == 3
  78         1,4,16,64,0,1024,256,4096,
  79 #endif
  80 };
  81
  82 void __init h8300_timer_setup(void)
  83 {
  84         unsigned int cnt;
  85         unsigned int div;
  86
  87         calc_param(cnt, div, divide_rate, 0x10000);
  88
  89         setup_irq(TPUIRQ, &tpu_irq);
  90
  91         /* TPU module enabled */
  92         ctrl_bclr(3, MSTPCRH);
  93
  94         ctrl_outb(0, TSTR);
  95         ctrl_outb(CCLR0 | div, TPUBASE + _TCR);
  96         ctrl_outb(0, TPUBASE + _TMDR);
  97         ctrl_outw(0, TPUBASE + _TIOR);
  98         ctrl_outb(0x01, TPUBASE + _TIER);
  99         ctrl_outw(cnt, TPUBASE + _GRA);
 100         ctrl_bset(CONFIG_H8300_TPU_CH, TSTR);
 101 }