OpenCloudOS-Kernel/arch/arm/mach-ixp4xx/include/mach/timex.h

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/*
* arch/arm/mach-ixp4xx/include/mach/timex.h
*
*/
#include <mach/hardware.h>
/*
* We use IXP425 General purpose timer for our timer needs, it runs at
* 66.66... MHz. We do a convulted calculation of CLOCK_TICK_RATE b/c the
* timer register ignores the bottom 2 bits of the LATCH value.
*/
#define FREQ 66666666
#define CLOCK_TICK_RATE (((FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ)