Ralf Baechle | 940f6b4 | 2007-11-24 22:33:28 +0000 | [diff] [blame] | 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 | */ |
Ralf Baechle | e6a1bb7 | 2007-11-28 15:07:42 +0000 | [diff] [blame] | 8 | #include <linux/clocksource.h> |
| 9 | #include <linux/init.h> |
| 10 | |
| 11 | #include <asm/time.h> |
Ralf Baechle | 940f6b4 | 2007-11-24 22:33:28 +0000 | [diff] [blame] | 12 | |
Magnus Damm | 8e19608 | 2009-04-21 12:24:00 -0700 | [diff] [blame] | 13 | static cycle_t c0_hpt_read(struct clocksource *cs) |
Ralf Baechle | 940f6b4 | 2007-11-24 22:33:28 +0000 | [diff] [blame] | 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 | |
Manuel Lauss | 779e7d4 | 2008-12-21 09:26:22 +0100 | [diff] [blame] | 25 | int __init init_r4k_clocksource(void) |
Ralf Baechle | 940f6b4 | 2007-11-24 22:33:28 +0000 | [diff] [blame] | 26 | { |
Ralf Baechle | 69e634f | 2008-03-12 13:58:10 +0000 | [diff] [blame] | 27 | if (!cpu_has_counter || !mips_hpt_frequency) |
| 28 | return -ENXIO; |
| 29 | |
Ralf Baechle | 664c4bb | 2008-11-03 11:31:54 +0000 | [diff] [blame] | 30 | /* Calculate a somewhat reasonable rating value */ |
Ralf Baechle | 940f6b4 | 2007-11-24 22:33:28 +0000 | [diff] [blame] | 31 | clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000; |
| 32 | |
John Stultz | 75c4fd8 | 2010-04-26 20:23:11 -0700 | [diff] [blame] | 33 | clocksource_register_hz(&clocksource_mips, mips_hpt_frequency); |
Ralf Baechle | 69e634f | 2008-03-12 13:58:10 +0000 | [diff] [blame] | 34 | |
| 35 | return 0; |
Ralf Baechle | 940f6b4 | 2007-11-24 22:33:28 +0000 | [diff] [blame] | 36 | } |