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  • /*
     * Copyright (C) 2003, 2004 Ralf Baechle
     *
     * SPDX-License-Identifier:	GPL-2.0
     */
    #ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H
    #define __ASM_MACH_GENERIC_MANGLE_PORT_H
    
    #define __swizzle_addr_b(port)	(port)
    #define __swizzle_addr_w(port)	(port)
    #define __swizzle_addr_l(port)	(port)
    #define __swizzle_addr_q(port)	(port)
    
    /*
     * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
     * less sane hardware forces software to fiddle with this...
     *
     * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
     * you can't have the numerical value of data and byte addresses within
     * multibyte quantities both preserved at the same time.  Hence two
     * variations of functions: non-prefixed ones that preserve the value
     * and prefixed ones that preserve byte addresses.  The latters are
     * typically used for moving raw data between a peripheral and memory (cf.
     * string I/O functions), hence the "__mem_" prefix.
     */
    #if defined(CONFIG_SWAP_IO_SPACE)
    
    # define ioswabb(a, x)		(x)
    # define __mem_ioswabb(a, x)	(x)
    # define ioswabw(a, x)		le16_to_cpu(x)
    # define __mem_ioswabw(a, x)	(x)
    # define ioswabl(a, x)		le32_to_cpu(x)
    # define __mem_ioswabl(a, x)	(x)
    # define ioswabq(a, x)		le64_to_cpu(x)
    # define __mem_ioswabq(a, x)	(x)
    
    #else
    
    # define ioswabb(a, x)		(x)
    # define __mem_ioswabb(a, x)	(x)
    # define ioswabw(a, x)		(x)
    # define __mem_ioswabw(a, x)	cpu_to_le16(x)
    # define ioswabl(a, x)		(x)
    # define __mem_ioswabl(a, x)	cpu_to_le32(x)
    # define ioswabq(a, x)		(x)
    # define __mem_ioswabq(a, x)	cpu_to_le32(x)
    
    #endif
    
    #endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */