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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/mach-common/mach/mangle-port.h
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/* SPDX-License-Identifier: GPL-2.0

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 *

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 * SH version cribbed from the MIPS copy:

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 *

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 * Copyright (C) 2003, 2004 Ralf Baechle

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 */

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#ifndef __MACH_COMMON_MANGLE_PORT_H

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#define __MACH_COMMON_MANGLE_PORT_H

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/*

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 * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;

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 * less sane hardware forces software to fiddle with this...

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 *

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 * Regardless, if the host bus endianness mismatches that of PCI/ISA, then

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 * you can't have the numerical value of data and byte addresses within

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 * multibyte quantities both preserved at the same time.  Hence two

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 * variations of functions: non-prefixed ones that preserve the value

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 * and prefixed ones that preserve byte addresses.  The latters are

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 * typically used for moving raw data between a peripheral and memory (cf.

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 * string I/O functions), hence the "__mem_" prefix.

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 */

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#if defined(CONFIG_SWAP_IO_SPACE)

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# define ioswabb(x)		(x)

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# define __mem_ioswabb(x)	(x)

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# define ioswabw(x)		le16_to_cpu(x)

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# define __mem_ioswabw(x)	(x)

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# define ioswabl(x)		le32_to_cpu(x)

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# define __mem_ioswabl(x)	(x)

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# define ioswabq(x)		le64_to_cpu(x)

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# define __mem_ioswabq(x)	(x)

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#else

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# define ioswabb(x)		(x)

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# define __mem_ioswabb(x)	(x)

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# define ioswabw(x)		(x)

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# define __mem_ioswabw(x)	cpu_to_le16(x)

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# define ioswabl(x)		(x)

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# define __mem_ioswabl(x)	cpu_to_le32(x)

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# define ioswabq(x)		(x)

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# define __mem_ioswabq(x)	cpu_to_le32(x)

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#endif

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#endif /* __MACH_COMMON_MANGLE_PORT_H */

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