arch/sh/include/mach-common/mach/mangle-port.h

   1 /*
   2  * SH version cribbed from the MIPS copy:
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2003, 2004 Ralf Baechle
   9  */
  10 #ifndef __MACH_COMMON_MANGLE_PORT_H
  11 #define __MACH_COMMON_MANGLE_PORT_H
  12
  13 /*
  14  * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
  15  * less sane hardware forces software to fiddle with this...
  16  *
  17  * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
  18  * you can't have the numerical value of data and byte addresses within
  19  * multibyte quantities both preserved at the same time.  Hence two
  20  * variations of functions: non-prefixed ones that preserve the value
  21  * and prefixed ones that preserve byte addresses.  The latters are
  22  * typically used for moving raw data between a peripheral and memory (cf.
  23  * string I/O functions), hence the "__mem_" prefix.
  24  */
  25 #if defined(CONFIG_SWAP_IO_SPACE)
  26
  27 # define ioswabb(x)             (x)
  28 # define __mem_ioswabb(x)       (x)
  29 # define ioswabw(x)             le16_to_cpu(x)
  30 # define __mem_ioswabw(x)       (x)
  31 # define ioswabl(x)             le32_to_cpu(x)
  32 # define __mem_ioswabl(x)       (x)
  33 # define ioswabq(x)             le64_to_cpu(x)
  34 # define __mem_ioswabq(x)       (x)
  35
  36 #else
  37
  38 # define ioswabb(x)             (x)
  39 # define __mem_ioswabb(x)       (x)
  40 # define ioswabw(x)             (x)
  41 # define __mem_ioswabw(x)       cpu_to_le16(x)
  42 # define ioswabl(x)             (x)
  43 # define __mem_ioswabl(x)       cpu_to_le32(x)
  44 # define ioswabq(x)             (x)
  45 # define __mem_ioswabq(x)       cpu_to_le32(x)
  46
  47 #endif
  48
  49 #endif /* __MACH_COMMON_MANGLE_PORT_H */