arch/arm/mach-rpc/include/mach/io.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/mach-rpc/include/mach/io.h
   4  *
   5  *  Copyright (C) 1997 Russell King
   6  *
   7  * Modifications:
   8  *  06-Dec-1997 RMK     Created.
   9  */
  10 #ifndef __ASM_ARM_ARCH_IO_H
  11 #define __ASM_ARM_ARCH_IO_H
  12
  13 #include <mach/hardware.h>
  14
  15 #define IO_SPACE_LIMIT 0xffff
  16
  17 /*
  18  * We need PC style IO addressing for:
  19  *  - floppy (at 0x3f2,0x3f4,0x3f5,0x3f7)
  20  *  - parport (at 0x278-0x27a, 0x27b-0x27f, 0x778-0x77a)
  21  *  - 8250 serial (only for compile)
  22  *
  23  * These peripherals are found in an area of MMIO which looks very much
  24  * like an ISA bus, but with registers at the low byte of each word.
  25  */
  26 #define __io(a)         (PCIO_BASE + ((a) << 2))
  27
  28 #endif