mangle-port.h (1839B)
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((__force __le16)(x)) 33# define __mem_ioswabw(a, x) (x) 34# define ioswabl(a, x) le32_to_cpu((__force __le32)(x)) 35# define __mem_ioswabl(a, x) (x) 36# define ioswabq(a, x) le64_to_cpu((__force __le64)(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) ((__force u16)cpu_to_le16(x)) 45# define ioswabl(a, x) (x) 46# define __mem_ioswabl(a, x) ((__force u32)cpu_to_le32(x)) 47# define ioswabq(a, x) (x) 48# define __mem_ioswabq(a, x) ((__force u64)cpu_to_le64(x)) 49 50#endif 51 52#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */