1 /* 2 * SH version cribbed from the MIPS copy: 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2003, 2004 Ralf Baechle 9 */ 10 #ifndef __MACH_COMMON_MANGLE_PORT_H 11 #define __MACH_COMMON_MANGLE_PORT_H 12 13 /* 14 * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware; 15 * less sane hardware forces software to fiddle with this... 16 * 17 * Regardless, if the host bus endianness mismatches that of PCI/ISA, then 18 * you can't have the numerical value of data and byte addresses within 19 * multibyte quantities both preserved at the same time. Hence two 20 * variations of functions: non-prefixed ones that preserve the value 21 * and prefixed ones that preserve byte addresses. The latters are 22 * typically used for moving raw data between a peripheral and memory (cf. 23 * string I/O functions), hence the "__mem_" prefix. 24 */ 25 #if defined(CONFIG_SWAP_IO_SPACE) 26 27 # define ioswabb(x) (x) 28 # define __mem_ioswabb(x) (x) 29 # define ioswabw(x) le16_to_cpu(x) 30 # define __mem_ioswabw(x) (x) 31 # define ioswabl(x) le32_to_cpu(x) 32 # define __mem_ioswabl(x) (x) 33 # define ioswabq(x) le64_to_cpu(x) 34 # define __mem_ioswabq(x) (x) 35 36 #else 37 38 # define ioswabb(x) (x) 39 # define __mem_ioswabb(x) (x) 40 # define ioswabw(x) (x) 41 # define __mem_ioswabw(x) cpu_to_le16(x) 42 # define ioswabl(x) (x) 43 # define __mem_ioswabl(x) cpu_to_le32(x) 44 # define ioswabq(x) (x) 45 # define __mem_ioswabq(x) cpu_to_le32(x) 46 47 #endif 48 49 #endif /* __MACH_COMMON_MANGLE_PORT_H */ 50