arch/arm/mach-pxa/include/mach/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
  15 #ifndef __ARCH_PXA_MTD_XIP_H__
  16 #define __ARCH_PXA_MTD_XIP_H__
  17
  18 #include <mach/regs-ost.h>
  19
  20 /* restored July 2017, this did not build since 2011! */
  21
  22 #define ICIP                    io_p2v(0x40d00000)
  23 #define ICMR                    io_p2v(0x40d00004)
  24 #define xip_irqpending()        (readl(ICIP) & readl(ICMR))
  25
  26 /* we sample OSCR and convert desired delta to usec (1/4 ~= 1000000/3686400) */
  27 #define xip_currtime()          readl(OSCR)
  28 #define xip_elapsed_since(x)    (signed)((readl(OSCR) - (x)) / 4)
  29
  30 /*
  31  * xip_cpu_idle() is used when waiting for a delay equal or larger than
  32  * the system timer tick period.  This should put the CPU into idle mode
  33  * to save power and to be woken up only when some interrupts are pending.
  34  * As above, this should not rely upon standard kernel code.
  35  */
  36
  37 #define xip_cpu_idle()  asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))
  38
  39 #endif /* __ARCH_PXA_MTD_XIP_H__ */