mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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0110feaaf6
Use the new fallback memcpy_{from,to}io and memset_io functions from
lib/iomem_copy.c on the arm64 processor architecture.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Yann Sionneau <ysionneau@kalrayinc.com>
Signed-off-by: Julian Vetter <jvetter@kalrayinc.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
52 lines
2 KiB
C
52 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on arch/arm/kernel/io.c
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*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/io.h>
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/*
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* This generates a memcpy that works on a from/to address which is aligned to
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* bits. Count is in terms of the number of bits sized quantities to copy. It
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* optimizes to use the STR groupings when possible so that it is WC friendly.
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*/
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#define memcpy_toio_aligned(to, from, count, bits) \
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({ \
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volatile u##bits __iomem *_to = to; \
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const u##bits *_from = from; \
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size_t _count = count; \
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const u##bits *_end_from = _from + ALIGN_DOWN(_count, 8); \
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\
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for (; _from < _end_from; _from += 8, _to += 8) \
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__const_memcpy_toio_aligned##bits(_to, _from, 8); \
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if ((_count % 8) >= 4) { \
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__const_memcpy_toio_aligned##bits(_to, _from, 4); \
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_from += 4; \
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_to += 4; \
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} \
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if ((_count % 4) >= 2) { \
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__const_memcpy_toio_aligned##bits(_to, _from, 2); \
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_from += 2; \
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_to += 2; \
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} \
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if (_count % 2) \
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__const_memcpy_toio_aligned##bits(_to, _from, 1); \
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})
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void __iowrite64_copy_full(void __iomem *to, const void *from, size_t count)
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{
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memcpy_toio_aligned(to, from, count, 64);
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dgh();
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}
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EXPORT_SYMBOL(__iowrite64_copy_full);
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void __iowrite32_copy_full(void __iomem *to, const void *from, size_t count)
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{
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memcpy_toio_aligned(to, from, count, 32);
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dgh();
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}
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EXPORT_SYMBOL(__iowrite32_copy_full);
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