release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-ixp4xx/include/mach/timex.h

   1 /*
   2  * arch/arm/mach-ixp4xx/include/mach/timex.h
   3  *
   4  */
   5
   6 #include <mach/hardware.h>
   7
   8 /*
   9  * We use IXP425 General purpose timer for our timer needs, it runs at
  10  * 66.66... MHz. We do a convulted calculation of CLOCK_TICK_RATE b/c the
  11  * timer register ignores the bottom 2 bits of the LATCH value.
  12  */
  13 #define FREQ 66666000
  14 #define CLOCK_TICK_RATE (((FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ)