LXR linux/arch/mips/kernel/csrc-r4k.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2007 by Ralf Baechle
   7 */
   8#include <linux/clocksource.h>
   9#include <linux/init.h>
  10#include <linux/sched_clock.h>
  11
  12#include <asm/time.h>
  13
  14static cycle_t c0_hpt_read(struct clocksource *cs)
  15{
  16        return read_c0_count();
  17}
  18
  19static struct clocksource clocksource_mips = {
  20        .name           = "MIPS",
  21        .read           = c0_hpt_read,
  22        .mask           = CLOCKSOURCE_MASK(32),
  23        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
  24};
  25
  26static u64 notrace r4k_read_sched_clock(void)
  27{
  28        return read_c0_count();
  29}
  30
  31int __init init_r4k_clocksource(void)
  32{
  33        if (!cpu_has_counter || !mips_hpt_frequency)
  34                return -ENXIO;
  35
  36        /* Calculate a somewhat reasonable rating value */
  37        clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
  38
  39        clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
  40
  41        sched_clock_register(r4k_read_sched_clock, 32, mips_hpt_frequency);
  42
  43        return 0;
  44}
  45