arch/h8300/platform/h8s/generic/timer.c

   1 /*
   2  *  linux/arch/h8300/platform/h8s/generic/timer.c
   3  *
   4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  *  Platform depend Timer Handler
   7  *
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/sched.h>
  12 #include <linux/kernel.h>
  13 #include <linux/param.h>
  14 #include <linux/string.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/init.h>
  18 #include <linux/timex.h>
  19
  20 #include <asm/segment.h>
  21 #include <asm/io.h>
  22 #include <asm/irq.h>
  23 #include <asm/regs267x.h>
  24
  25 #define CMFA 6
  26
  27 #define CMIEA 0x40
  28 #define CCLR_CMA 0x08
  29 #define CLK_DIV8192 0x03
  30
  31 #define H8300_TIMER_FREQ CONFIG_CPU_CLOCK*1000/8192 /* Timer input freq. */
  32
  33 void __init platform_timer_setup(irqreturn_t (*timer_int)(int, void *, struct pt_regs *))
  34 {
  35         /* 8bit timer module enabled */
  36         ctrl_outb(ctrl_inb(MSTPCRL) & ~0x01, MSTPCRL);
  37         /* setup 8bit timer ch1 */
  38         ctrl_outb(H8300_TIMER_FREQ / HZ, _8TCORA1);      /* set interval */
  39         ctrl_outb(0x00, _8TCSR1);                        /* no output */
  40         request_irq(76, timer_int, 0, "timer" ,0);
  41         ctrl_outb(CMIEA|CCLR_CMA|CLK_DIV8192, _8TCR1);   /* start count */
  42 }
  43
  44 void platform_timer_eoi(void)
  45 {
  46         *(volatile unsigned char *)_8TCSR1 &= ~(1 << CMFA);
  47 }
  48
  49 void platform_gettod(int *year, int *mon, int *day, int *hour,
  50                  int *min, int *sec)
  51 {
  52         *year = *mon = *day = *hour = *min = *sec = 0;
  53 }