blob: decd1fa38d551bf132f9bba4aa2a48400e129ac8 [file] [log] [blame]
Ralf Baechle940f6b42007-11-24 22:33:28 +00001/*
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 */
Ralf Baechlee6a1bb72007-11-28 15:07:42 +00008#include <linux/clocksource.h>
9#include <linux/init.h>
10
11#include <asm/time.h>
Ralf Baechle940f6b42007-11-24 22:33:28 +000012
Magnus Damm8e196082009-04-21 12:24:00 -070013static cycle_t c0_hpt_read(struct clocksource *cs)
Ralf Baechle940f6b42007-11-24 22:33:28 +000014{
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
Manuel Lauss779e7d42008-12-21 09:26:22 +010025int __init init_r4k_clocksource(void)
Ralf Baechle940f6b42007-11-24 22:33:28 +000026{
Ralf Baechle69e634f2008-03-12 13:58:10 +000027 if (!cpu_has_counter || !mips_hpt_frequency)
28 return -ENXIO;
29
Ralf Baechle664c4bb2008-11-03 11:31:54 +000030 /* Calculate a somewhat reasonable rating value */
Ralf Baechle940f6b42007-11-24 22:33:28 +000031 clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
32
John Stultz75c4fd82010-04-26 20:23:11 -070033 clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
Ralf Baechle69e634f2008-03-12 13:58:10 +000034
35 return 0;
Ralf Baechle940f6b42007-11-24 22:33:28 +000036}