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| 2 | |
| 3 | * Based on arch/arm/kernel/io.c
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| 4 | *
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| 5 | * Copyright (C) 2012 ARM Ltd.
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| 6 |
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| 7 |
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| 8 | #include <linux/export.h>
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| 9 | #include <linux/types.h>
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| 10 | #include <linux/io.h>
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| 11 |
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| 12 | |
| 13 | * This generates a memcpy that works on a from/to address which is aligned to
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| 14 | * bits. Count is in terms of the number of bits sized quantities to copy. It
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| 15 | * optimizes to use the STR groupings when possible so that it is WC friendly.
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| 16 |
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| 17 | #define memcpy_toio_aligned(to, from, count, bits) \
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| 18 | ({ \
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| 19 | volatile u##bits __iomem *_to = to; \
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| 20 | const u##bits *_from = from; \
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| 21 | size_t _count = count; \
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| 22 | const u##bits *_end_from = _from + ALIGN_DOWN(_count, 8); \
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| 23 | \
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| 24 | for (; _from < _end_from; _from += 8, _to += 8) \
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| 25 | __const_memcpy_toio_aligned##bits(_to, _from, 8); \
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| 26 | if ((_count % 8) >= 4) { \
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| 27 | __const_memcpy_toio_aligned##bits(_to, _from, 4); \
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| 28 | _from += 4; \
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| 29 | _to += 4; \
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| 30 | } \
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| 31 | if ((_count % 4) >= 2) { \
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| 32 | __const_memcpy_toio_aligned##bits(_to, _from, 2); \
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| 33 | _from += 2; \
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| 34 | _to += 2; \
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| 35 | } \
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| 36 | if (_count % 2) \
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| 37 | __const_memcpy_toio_aligned##bits(_to, _from, 1); \
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| 38 | })
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| 39 |
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| 40 | void __iowrite64_copy_full(void __iomem *to, const void *from, size_t count)
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| 41 | {
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| 42 | memcpy_toio_aligned(to, from, count, 64);
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| 43 | dgh();
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| 44 | }
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| 45 | EXPORT_SYMBOL(__iowrite64_copy_full);
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| 46 |
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| 47 | void __iowrite32_copy_full(void __iomem *to, const void *from, size_t count)
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| 48 | {
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| 49 | memcpy_toio_aligned(to, from, count, 32);
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| 50 | dgh();
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| 51 | }
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| 52 | EXPORT_SYMBOL(__iowrite32_copy_full);
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