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Linux/arch/mips/kernel/csrc-r4k.c

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  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 
 13 static cycle_t c0_hpt_read(struct clocksource *cs)
 14 {
 15         return read_c0_count();
 16 }
 17 
 18 static 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 
 25 int __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 

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