7b5f96949d
MIPS MMIO macros for byteswapping from/to hardware endianness are a bit
tricky because they use cpu_to_le{16,32,64}() in both directions.
This generates a lot of questions from sparse as __le{16,32,64} types
are 'restricted' and direct cast is forbidden in order to prevent messing
up the byteorder.
As MMIO ops are used in almost every single driver, this leads to console
flooding and complicates bug hunting.
We could fix it in a more proper way, i.e. separate from device /
to device byteswap macros and expand __BUILD_MEMORY_*(), but this seems
redundant and will produce code duplication.
Instead, just expand the existing *ioswab*() macros with forced
typecasting to stop floods.
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2003, 2004 Ralf Baechle
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*/
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#ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H
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#define __ASM_MACH_GENERIC_MANGLE_PORT_H
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#define __swizzle_addr_b(port) (port)
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#define __swizzle_addr_w(port) (port)
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#define __swizzle_addr_l(port) (port)
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#define __swizzle_addr_q(port) (port)
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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(a, x) (x)
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# define __mem_ioswabb(a, x) (x)
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# define ioswabw(a, x) le16_to_cpu((__force __le16)(x))
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# define __mem_ioswabw(a, x) (x)
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# define ioswabl(a, x) le32_to_cpu((__force __le32)(x))
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# define __mem_ioswabl(a, x) (x)
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# define ioswabq(a, x) le64_to_cpu((__force __le64)(x))
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# define __mem_ioswabq(a, x) (x)
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#else
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# define ioswabb(a, x) (x)
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# define __mem_ioswabb(a, x) (x)
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# define ioswabw(a, x) (x)
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# define __mem_ioswabw(a, x) ((__force u16)cpu_to_le16(x))
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# define ioswabl(a, x) (x)
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# define __mem_ioswabl(a, x) ((__force u32)cpu_to_le32(x))
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# define ioswabq(a, x) (x)
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# define __mem_ioswabq(a, x) ((__force u64)cpu_to_le64(x))
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#endif
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#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */
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