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 */