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91 lines
1.5 KiB
91 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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, 4)) { |
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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 >= 4) { |
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*(u32 *)to = __raw_readl(from); |
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from += 4; |
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to += 4; |
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count -= 4; |
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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, 4)) { |
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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 >= 4) { |
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__raw_writel(*(u32 *)from, to); |
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from += 4; |
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to += 4; |
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count -= 4; |
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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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u32 qc = (u8)c; |
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qc |= qc << 8; |
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qc |= qc << 16; |
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while (count && !IS_ALIGNED((unsigned long)dst, 4)) { |
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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 >= 4) { |
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__raw_writel(qc, dst); |
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dst += 4; |
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count -= 4; |
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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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