projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e7916357 DD |
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 | ||
| 22 | static 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 */ |