| /* |
| * 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; |
| } |
| |
| extern int read_current_timer(unsigned long *timer_value); |
| #define ARCH_HAS_READ_CURRENT_TIMER 1 |
| |
| #endif /* __ASM_AVR32_TIMEX_H */ |