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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-08-07 09:55:16 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-08-07 09:55:16 +0100
commita1b81a84fff05dbfef45b7012c26e1fee9973e5d (patch)
tree3d053e76542ad4d20bd83ad35c13eabff97003ab /arch/avr32/include/asm/timex.h
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes (diff)
parentavr32: Use <mach/foo.h> instead of <asm/arch/foo.h> (diff)
downloadlinux-dev-a1b81a84fff05dbfef45b7012c26e1fee9973e5d.tar.xz
linux-dev-a1b81a84fff05dbfef45b7012c26e1fee9973e5d.zip
Merge branch 'header-move' of git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6
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
new file mode 100644
index 000000000000..187dcf38b210
--- /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 */