include/asm-arm/arch-omap/io.h

   1 /*
   2  * linux/include/asm-arm/arch-omap/io.h
   3  *
   4  * Copied from linux/include/asm-arm/arch-sa1100/io.h
   5  * Copyright (C) 1997-1999 Russell King
   6  *
   7  * Modifications:
   8  *  06-12-1997  RMK     Created.
   9  *  07-04-1999  RMK     Major cleanup
  10  */
  11 #ifndef __ASM_ARM_ARCH_IO_H
  12 #define __ASM_ARM_ARCH_IO_H
  13
  14 #define IO_SPACE_LIMIT 0xffffffff
  15
  16 /*
  17  * We don't actually have real ISA nor PCI buses, but there is so many
  18  * drivers out there that might just work if we fake them...
  19  */
  20 #define __io(a)                 (PCIO_BASE + (a))
  21 #define __mem_pci(a)            ((unsigned long)(a))
  22 #define __mem_isa(a)            ((unsigned long)(a))
  23
  24 /*
  25  * Functions to access the OMAP IO region
  26  *
  27  * NOTE: - Use omap_read/write[bwl] for physical register addresses
  28  *       - Use __raw_read/write[bwl]() for virtual register addresses
  29  *       - Use IO_ADDRESS(phys_addr) to convert registers to virtual addresses
  30  *       - DO NOT use hardcoded virtual addresses to allow changing the
  31  *         IO address space again if needed
  32  */
  33 #define omap_readb(a)           (*(volatile unsigned char  *)IO_ADDRESS(a))
  34 #define omap_readw(a)           (*(volatile unsigned short *)IO_ADDRESS(a))
  35 #define omap_readl(a)           (*(volatile unsigned int   *)IO_ADDRESS(a))
  36
  37 #define omap_writeb(v,a)        (*(volatile unsigned char  *)IO_ADDRESS(a) = (v))
  38 #define omap_writew(v,a)        (*(volatile unsigned short *)IO_ADDRESS(a) = (v))
  39 #define omap_writel(v,a)        (*(volatile unsigned int   *)IO_ADDRESS(a) = (v))
  40
  41 #endif