arch/h8300/platform/h8300h/h8max/timer.c

   1 /*
   2  *  linux/arch/h8300/platform/h8300h/h8max/timer.c
   3  *
   4  *  Yoshinori Sato <ysato@users.sourcefoge.jp>
   5  *
   6  *  Platform depend 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/regs306x.h>
  25
  26 #define CMFA 6
  27
  28 #define CMIEA 0x40
  29 #define CCLR_CMA 0x08
  30 #define CLK_DIV8192 0x03
  31
  32 #define H8300_TIMER_FREQ CONFIG_CPU_CLOCK*1000/8192 /* Timer input freq. */
  33
  34 void __init platform_timer_setup(irqreturn_t (*timer_int)(int, void *, struct pt_regs *))
  35 {
  36         /* setup 8bit timer ch2 */
  37         ctrl_outb(H8300_TIMER_FREQ / HZ, TCORA2);      /* set interval */
  38         ctrl_outb(0x00, _8TCSR2);                      /* no output */
  39         request_irq(40, timer_int, 0, "timer", 0);
  40         ctrl_outb(CMIEA|CCLR_CMA|CLK_DIV8192, _8TCR2); /* start count */
  41 }
  42
  43 void platform_timer_eoi(void)
  44 {
  45         *(volatile unsigned char *)_8TCSR2 &= ~(1 << CMFA);
  46 }
  47
  48 void platform_gettod(int *year, int *mon, int *day, int *hour,
  49                  int *min, int *sec)
  50 {
  51         *year = *mon = *day = *hour = *min = *sec = 0;
  52 }
  53