91 lines
1.5 KiB
C
91 lines
1.5 KiB
C
// 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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