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/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/regs306x.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         /* setup 8bit timer ch2 */
  36         ctrl_outb(H8300_TIMER_FREQ / HZ, TCORA2);      /* set interval */
  37         ctrl_outb(0x00, _8TCSR2);                      /* no output */
  38         request_irq(40, timer_int, 0, "timer", 0);
  39         ctrl_outb(CMIEA|CCLR_CMA|CLK_DIV8192, _8TCR2); /* start count */
  40 }
  41
  42 void platform_timer_eoi(void)
  43 {
  44         *(volatile unsigned char *)_8TCSR2 &= ~(1 << CMFA);
  45 }
  46
  47 void platform_gettod(int *year, int *mon, int *day, int *hour,
  48                  int *min, int *sec)
  49 {
  50         *year = *mon = *day = *hour = *min = *sec = 0;
  51 }
  52