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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * MTD primitives for XIP support. Architecture specific functions
   4  *
   5  * Do not include this file directly. It's included from linux/mtd/xip.h
   6  *
   7  * Author:      Nicolas Pitre
   8  * Created:     Nov 2, 2004
   9  * Copyright:   (C) 2004 MontaVista Software, Inc.
  10  */
  11
  12 #ifndef __ARCH_PXA_MTD_XIP_H__
  13 #define __ARCH_PXA_MTD_XIP_H__
  14
  15 #include <mach/regs-ost.h>
  16
  17 /* restored July 2017, this did not build since 2011! */
  18
  19 #define ICIP                    io_p2v(0x40d00000)
  20 #define ICMR                    io_p2v(0x40d00004)
  21 #define xip_irqpending()        (readl(ICIP) & readl(ICMR))
  22
  23 /* we sample OSCR and convert desired delta to usec (1/4 ~= 1000000/3686400) */
  24 #define xip_currtime()          readl(OSCR)
  25 #define xip_elapsed_since(x)    (signed)((readl(OSCR) - (x)) / 4)
  26
  27 /*
  28  * xip_cpu_idle() is used when waiting for a delay equal or larger than
  29  * the system timer tick period.  This should put the CPU into idle mode
  30  * to save power and to be woken up only when some interrupts are pending.
  31  * As above, this should not rely upon standard kernel code.
  32  */
  33
  34 #define xip_cpu_idle()  asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))
  35
  36 #endif /* __ARCH_PXA_MTD_XIP_H__ */