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mangle-port.h
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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 #define __swizzle_addr_b(port) (port)
12 #define __swizzle_addr_w(port) (port)
13 #define __swizzle_addr_l(port) (port)
14 #define __swizzle_addr_q(port) (port)
15 
16 /*
17  * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
18  * less sane hardware forces software to fiddle with this...
19  *
20  * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
21  * you can't have the numerical value of data and byte addresses within
22  * multibyte quantities both preserved at the same time. Hence two
23  * variations of functions: non-prefixed ones that preserve the value
24  * and prefixed ones that preserve byte addresses. The latters are
25  * typically used for moving raw data between a peripheral and memory (cf.
26  * string I/O functions), hence the "__mem_" prefix.
27  */
28 #if defined(CONFIG_SWAP_IO_SPACE)
29 
30 # define ioswabb(a, x) (x)
31 # define __mem_ioswabb(a, x) (x)
32 # define ioswabw(a, x) le16_to_cpu(x)
33 # define __mem_ioswabw(a, x) (x)
34 # define ioswabl(a, x) le32_to_cpu(x)
35 # define __mem_ioswabl(a, x) (x)
36 # define ioswabq(a, x) le64_to_cpu(x)
37 # define __mem_ioswabq(a, x) (x)
38 
39 #else
40 
41 # define ioswabb(a, x) (x)
42 # define __mem_ioswabb(a, x) (x)
43 # define ioswabw(a, x) (x)
44 # define __mem_ioswabw(a, x) cpu_to_le16(x)
45 # define ioswabl(a, x) (x)
46 # define __mem_ioswabl(a, x) cpu_to_le32(x)
47 # define ioswabq(a, x) (x)
48 # define __mem_ioswabq(a, x) cpu_to_le32(x)
49 
50 #endif
51 
52 #endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */