arch/ia64/sn/kernel/sn2/timer.c

   1 /*
   2  * linux/arch/ia64/sn/kernel/sn2/timer.c
   3  *
   4  * Copyright (C) 2003 Silicon Graphics, Inc.
   5  * Copyright (C) 2003 Hewlett-Packard Co
   6  *      David Mosberger <davidm@hpl.hp.com>: updated for new timer-interpolation infrastructure
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/time.h>
  13 #include <linux/interrupt.h>
  14
  15 #include <asm/hw_irq.h>
  16 #include <asm/system.h>
  17
  18 #include <asm/sn/leds.h>
  19 #include <asm/sn/shub_mmr.h>
  20 #include <asm/sn/clksupport.h>
  21
  22 extern unsigned long sn_rtc_cycles_per_second;
  23
  24 static struct time_interpolator sn2_interpolator = {
  25         .drift = -1,
  26         .shift = 10,
  27         .mask = (1LL << 55) - 1,
  28         .source = TIME_SOURCE_MMIO64
  29 };
  30
  31 void __init sn_timer_init(void)
  32 {
  33         sn2_interpolator.frequency = sn_rtc_cycles_per_second;
  34         sn2_interpolator.addr = RTC_COUNTER_ADDR;
  35         register_time_interpolator(&sn2_interpolator);
  36 }