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Diffstat (limited to 'arch/avr32/include/asm/timex.h')
-rw-r--r-- | arch/avr32/include/asm/timex.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/avr32/include/asm/timex.h b/arch/avr32/include/asm/timex.h new file mode 100644 index 000000000000..187dcf38b210 --- /dev/null +++ b/arch/avr32/include/asm/timex.h | |||
@@ -0,0 +1,39 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2004-2006 Atmel Corporation | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License version 2 as | ||
6 | * published by the Free Software Foundation. | ||
7 | */ | ||
8 | #ifndef __ASM_AVR32_TIMEX_H | ||
9 | #define __ASM_AVR32_TIMEX_H | ||
10 | |||
11 | /* | ||
12 | * This is the frequency of the timer used for Linux's timer interrupt. | ||
13 | * The value should be defined as accurate as possible or under certain | ||
14 | * circumstances Linux timekeeping might become inaccurate or fail. | ||
15 | * | ||
16 | * For many system the exact clockrate of the timer isn't known but due to | ||
17 | * the way this value is used we can get away with a wrong value as long | ||
18 | * as this value is: | ||
19 | * | ||
20 | * - a multiple of HZ | ||
21 | * - a divisor of the actual rate | ||
22 | * | ||
23 | * 500000 is a good such cheat value. | ||
24 | * | ||
25 | * The obscure number 1193182 is the same as used by the original i8254 | ||
26 | * time in legacy PC hardware; the chip is never found in AVR32 systems. | ||
27 | */ | ||
28 | #define CLOCK_TICK_RATE 500000 /* Underlying HZ */ | ||
29 | |||
30 | typedef unsigned long cycles_t; | ||
31 | |||
32 | static inline cycles_t get_cycles (void) | ||
33 | { | ||
34 | return 0; | ||
35 | } | ||
36 | |||
37 | #define ARCH_HAS_READ_CURRENT_TIMER | ||
38 | |||
39 | #endif /* __ASM_AVR32_TIMEX_H */ | ||