1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003, 2004 Ralf Baechle
7 */
8#ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H
9#define __ASM_MACH_GENERIC_MANGLE_PORT_H
10
11#include <asm/byteorder.h>
12
13#ifdef __BIG_ENDIAN
14
15# define __swizzle_addr_b(port)	(port)
16# define __swizzle_addr_w(port)	(port)
17# define __swizzle_addr_l(port)	(port)
18# define __swizzle_addr_q(port)	(port)
19
20#else /* __LITTLE_ENDIAN */
21
22static inline bool __should_swizzle_addr(unsigned long p)
23{
24	/* boot bus? */
25	return ((p >> 40) & 0xff) == 0;
26}
27
28# define __swizzle_addr_b(port)	\
29	(__should_swizzle_addr(port) ? (port) ^ 7 : (port))
30# define __swizzle_addr_w(port)	\
31	(__should_swizzle_addr(port) ? (port) ^ 6 : (port))
32# define __swizzle_addr_l(port)	\
33	(__should_swizzle_addr(port) ? (port) ^ 4 : (port))
34# define __swizzle_addr_q(port)	(port)
35
36#endif /* __BIG_ENDIAN */
37
38/*
39 * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
40 * less sane hardware forces software to fiddle with this...
41 *
42 * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
43 * you can't have the numerical value of data and byte addresses within
44 * multibyte quantities both preserved at the same time.  Hence two
45 * variations of functions: non-prefixed ones that preserve the value
46 * and prefixed ones that preserve byte addresses.  The latters are
47 * typically used for moving raw data between a peripheral and memory (cf.
48 * string I/O functions), hence the "__mem_" prefix.
49 */
50#if defined(CONFIG_SWAP_IO_SPACE)
51
52# define ioswabb(a, x)		(x)
53# define __mem_ioswabb(a, x)	(x)
54# define ioswabw(a, x)		le16_to_cpu(x)
55# define __mem_ioswabw(a, x)	(x)
56# define ioswabl(a, x)		le32_to_cpu(x)
57# define __mem_ioswabl(a, x)	(x)
58# define ioswabq(a, x)		le64_to_cpu(x)
59# define __mem_ioswabq(a, x)	(x)
60
61#else
62
63# define ioswabb(a, x)		(x)
64# define __mem_ioswabb(a, x)	(x)
65# define ioswabw(a, x)		(x)
66# define __mem_ioswabw(a, x)	cpu_to_le16(x)
67# define ioswabl(a, x)		(x)
68# define __mem_ioswabl(a, x)	cpu_to_le32(x)
69# define ioswabq(a, x)		(x)
70# define __mem_ioswabq(a, x)	cpu_to_le32(x)
71
72#endif
73
74#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */
75