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

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * SH version cribbed from the MIPS copy:
   4  *
   5  * Copyright (C) 2003, 2004 Ralf Baechle
   6  */
   7 #ifndef __MACH_COMMON_MANGLE_PORT_H
   8 #define __MACH_COMMON_MANGLE_PORT_H
   9
  10 /*
  11  * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
  12  * less sane hardware forces software to fiddle with this...
  13  *
  14  * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
  15  * you can't have the numerical value of data and byte addresses within
  16  * multibyte quantities both preserved at the same time.  Hence two
  17  * variations of functions: non-prefixed ones that preserve the value
  18  * and prefixed ones that preserve byte addresses.  The latters are
  19  * typically used for moving raw data between a peripheral and memory (cf.
  20  * string I/O functions), hence the "__mem_" prefix.
  21  */
  22 #if defined(CONFIG_SWAP_IO_SPACE)
  23
  24 # define ioswabb(x)             (x)
  25 # define __mem_ioswabb(x)       (x)
  26 # define ioswabw(x)             le16_to_cpu(x)
  27 # define __mem_ioswabw(x)       (x)
  28 # define ioswabl(x)             le32_to_cpu(x)
  29 # define __mem_ioswabl(x)       (x)
  30 # define ioswabq(x)             le64_to_cpu(x)
  31 # define __mem_ioswabq(x)       (x)
  32
  33 #else
  34
  35 # define ioswabb(x)             (x)
  36 # define __mem_ioswabb(x)       (x)
  37 # define ioswabw(x)             (x)
  38 # define __mem_ioswabw(x)       cpu_to_le16(x)
  39 # define ioswabl(x)             (x)
  40 # define __mem_ioswabl(x)       cpu_to_le32(x)
  41 # define ioswabq(x)             (x)
  42 # define __mem_ioswabq(x)       cpu_to_le32(x)
  43
  44 #endif
  45
  46 #endif /* __MACH_COMMON_MANGLE_PORT_H */