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97 lines
1.6 KiB
97 lines
1.6 KiB
// 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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* Copy data from IO memory space to "real" memory space. |
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*/ |
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void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count) |
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{ |
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while (count && !IS_ALIGNED((unsigned long)from, 8)) { |
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*(u8 *)to = __raw_readb(from); |
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from++; |
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to++; |
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count--; |
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} |
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while (count >= 8) { |
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*(u64 *)to = __raw_readq(from); |
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from += 8; |
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to += 8; |
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count -= 8; |
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} |
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while (count) { |
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*(u8 *)to = __raw_readb(from); |
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from++; |
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to++; |
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count--; |
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} |
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} |
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EXPORT_SYMBOL(__memcpy_fromio); |
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/* |
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* Copy data from "real" memory space to IO memory space. |
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*/ |
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void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count) |
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{ |
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while (count && !IS_ALIGNED((unsigned long)to, 8)) { |
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__raw_writeb(*(u8 *)from, to); |
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from++; |
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to++; |
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count--; |
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} |
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while (count >= 8) { |
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__raw_writeq(*(u64 *)from, to); |
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from += 8; |
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to += 8; |
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count -= 8; |
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} |
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while (count) { |
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__raw_writeb(*(u8 *)from, to); |
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from++; |
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to++; |
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count--; |
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} |
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} |
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EXPORT_SYMBOL(__memcpy_toio); |
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/* |
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* "memset" on IO memory space. |
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*/ |
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void __memset_io(volatile void __iomem *dst, int c, size_t count) |
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{ |
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u64 qc = (u8)c; |
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qc |= qc << 8; |
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qc |= qc << 16; |
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qc |= qc << 32; |
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while (count && !IS_ALIGNED((unsigned long)dst, 8)) { |
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__raw_writeb(c, dst); |
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dst++; |
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count--; |
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} |
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while (count >= 8) { |
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__raw_writeq(qc, dst); |
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dst += 8; |
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count -= 8; |
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} |
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while (count) { |
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__raw_writeb(c, dst); |
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dst++; |
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count--; |
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} |
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} |
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EXPORT_SYMBOL(__memset_io);
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