include/asm-arm/arch-pxa/mtd-xip.h

   1 /*
   2  * MTD primitives for XIP support. Architecture specific functions
   3  *
   4  * Do not include this file directly. It's included from linux/mtd/xip.h
   5  *
   6  * Author:      Nicolas Pitre
   7  * Created:     Nov 2, 2004
   8  * Copyright:   (C) 2004 MontaVista Software, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * $Id: xip.h,v 1.2 2004/12/01 15:49:10 nico Exp $
  15  */
  16
  17 #ifndef __ARCH_PXA_MTD_XIP_H__
  18 #define __ARCH_PXA_MTD_XIP_H__
  19
  20 #include <asm/arch/pxa-regs.h>
  21
  22 #define xip_irqpending()        (ICIP & ICMR)
  23
  24 /* we sample OSCR and convert desired delta to usec (1/4 ~= 1000000/3686400) */
  25 #define xip_currtime()          (OSCR)
  26 #define xip_elapsed_since(x)    (signed)((OSCR - (x)) / 4)
  27
  28 /*
  29  * xip_cpu_idle() is used when waiting for a delay equal or larger than
  30  * the system timer tick period.  This should put the CPU into idle mode
  31  * to save power and to be woken up only when some interrupts are pending.
  32  * As above, this should not rely upon standard kernel code.
  33  */
  34
  35 #define xip_cpu_idle()  asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))
  36
  37 #endif /* __ARCH_PXA_MTD_XIP_H__ */