140 lines
3.4 KiB
C
140 lines
3.4 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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* 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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* 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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/*
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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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