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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 00000000000..187dcf38b21 --- /dev/null +++ b/arch/avr32/include/asm/timex.h @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef __ASM_AVR32_TIMEX_H +#define __ASM_AVR32_TIMEX_H + +/* + * This is the frequency of the timer used for Linux's timer interrupt. + * The value should be defined as accurate as possible or under certain + * circumstances Linux timekeeping might become inaccurate or fail. + * + * For many system the exact clockrate of the timer isn't known but due to + * the way this value is used we can get away with a wrong value as long + * as this value is: + * + * - a multiple of HZ + * - a divisor of the actual rate + * + * 500000 is a good such cheat value. + * + * The obscure number 1193182 is the same as used by the original i8254 + * time in legacy PC hardware; the chip is never found in AVR32 systems. + */ +#define CLOCK_TICK_RATE 500000 /* Underlying HZ */ + +typedef unsigned long cycles_t; + +static inline cycles_t get_cycles (void) +{ + return 0; +} + +#define ARCH_HAS_READ_CURRENT_TIMER + +#endif /* __ASM_AVR32_TIMEX_H */ |