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authorIngo Molnar <mingo@elte.hu>2008-09-14 20:24:00 +0400
committerIngo Molnar <mingo@elte.hu>2008-09-14 20:24:00 +0400
commit83bd6998b04fc1bb7280b14f16b2bdbdc07c914b (patch)
treeaf1bbe2bac5752b69b1ac58bf5d822c735da439b /arch/avr32/include/asm/timex.h
parente7250b8ae3870f37f660c2f65cafcaba85e3bfd3 (diff)
parentadee14b2e1557d0a8559f29681732d05a89dfc35 (diff)
downloadlinux-83bd6998b04fc1bb7280b14f16b2bdbdc07c914b.tar.xz
Merge commit 'v2.6.27-rc6' into timers/hpet
Diffstat (limited to 'arch/avr32/include/asm/timex.h')
-rw-r--r--arch/avr32/include/asm/timex.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/avr32/include/asm/timex.h b/arch/avr32/include/asm/timex.h
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+++ b/arch/avr32/include/asm/timex.h
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+/*
+ * 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 */