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