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-rw-r--r--include/asm-mips/mach-generic/mangle-port.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/include/asm-mips/mach-generic/mangle-port.h b/include/asm-mips/mach-generic/mangle-port.h
index 4a98d83b8ec7..6e1b0c075de7 100644
--- a/include/asm-mips/mach-generic/mangle-port.h
+++ b/include/asm-mips/mach-generic/mangle-port.h
@@ -13,4 +13,40 @@
13#define __swizzle_addr_l(port) (port) 13#define __swizzle_addr_l(port) (port)
14#define __swizzle_addr_q(port) (port) 14#define __swizzle_addr_q(port) (port)
15 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
16#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */ 52#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */