summaryrefslogtreecommitdiffstats
path: root/arch/sh/include/mach-common/mach/mangle-port.h
blob: 4ca1769a0f12938e7de7589f8a3eec80b08a889b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
/*
 * SH version cribbed from the MIPS copy:
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2003, 2004 Ralf Baechle
 */
#ifndef __MACH_COMMON_MANGLE_PORT_H
#define __MACH_COMMON_MANGLE_PORT_H

/*
 * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
 * less sane hardware forces software to fiddle with this...
 *
 * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
 * you can't have the numerical value of data and byte addresses within
 * multibyte quantities both preserved at the same time.  Hence two
 * variations of functions: non-prefixed ones that preserve the value
 * and prefixed ones that preserve byte addresses.  The latters are
 * typically used for moving raw data between a peripheral and memory (cf.
 * string I/O functions), hence the "__mem_" prefix.
 */
#if defined(CONFIG_SWAP_IO_SPACE)

# define ioswabb(x)		(x)
# define __mem_ioswabb(x)	(x)
# define ioswabw(x)		le16_to_cpu(x)
# define __mem_ioswabw(x)	(x)
# define ioswabl(x)		le32_to_cpu(x)
# define __mem_ioswabl(x)	(x)
# define ioswabq(x)		le64_to_cpu(x)
# define __mem_ioswabq(x)	(x)

#else

# define ioswabb(x)		(x)
# define __mem_ioswabb(x)	(x)
# define ioswabw(x)		(x)
# define __mem_ioswabw(x)	cpu_to_le16(x)
# define ioswabl(x)		(x)
# define __mem_ioswabl(x)	cpu_to_le32(x)
# define ioswabq(x)		(x)
# define __mem_ioswabq(x)	cpu_to_le32(x)

#endif

#endif /* __MACH_COMMON_MANGLE_PORT_H */