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
  11#include <asm/time.h>
  12
  13static cycle_t c0_hpt_read(struct clocksource *cs)
  14{
  15        return read_c0_count();
  16}
  17
  18static struct clocksource clocksource_mips = {
  19        .name           = "MIPS",
  20        .read           = c0_hpt_read,
  21        .mask           = CLOCKSOURCE_MASK(32),
  22        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
  23};
  24
  25int __init init_r4k_clocksource(void)
  26{
  27        if (!cpu_has_counter || !mips_hpt_frequency)
  28                return -ENXIO;
  29
  30        /* Calculate a somewhat reasonable rating value */
  31        clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
  32
  33        clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
  34
  35        return 0;
  36}
  37