1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2006 PathScale, Inc.  All Rights Reserved.
4 */
5
6#include <linux/export.h>
7#include <linux/io.h>
8
9/**
10 * __iowrite32_copy - copy data to MMIO space, in 32-bit units
11 * @to: destination, in MMIO space (must be 32-bit aligned)
12 * @from: source (must be 32-bit aligned)
13 * @count: number of 32-bit quantities to copy
14 *
15 * Copy data from kernel space to MMIO space, in units of 32 bits at a
16 * time.  Order of access is not guaranteed, nor is a memory barrier
17 * performed afterwards.
18 */
19void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
20					    const void *from,
21					    size_t count)
22{
23	u32 __iomem *dst = to;
24	const u32 *src = from;
25	const u32 *end = src + count;
26
27	while (src < end)
28		__raw_writel(*src++, dst++);
29}
30EXPORT_SYMBOL_GPL(__iowrite32_copy);
31
32/**
33 * __ioread32_copy - copy data from MMIO space, in 32-bit units
34 * @to: destination (must be 32-bit aligned)
35 * @from: source, in MMIO space (must be 32-bit aligned)
36 * @count: number of 32-bit quantities to copy
37 *
38 * Copy data from MMIO space to kernel space, in units of 32 bits at a
39 * time.  Order of access is not guaranteed, nor is a memory barrier
40 * performed afterwards.
41 */
42void __ioread32_copy(void *to, const void __iomem *from, size_t count)
43{
44	u32 *dst = to;
45	const u32 __iomem *src = from;
46	const u32 __iomem *end = src + count;
47
48	while (src < end)
49		*dst++ = __raw_readl(src++);
50}
51EXPORT_SYMBOL_GPL(__ioread32_copy);
52
53/**
54 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
55 * @to: destination, in MMIO space (must be 64-bit aligned)
56 * @from: source (must be 64-bit aligned)
57 * @count: number of 64-bit quantities to copy
58 *
59 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
60 * time.  Order of access is not guaranteed, nor is a memory barrier
61 * performed afterwards.
62 */
63void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
64					    const void *from,
65					    size_t count)
66{
67#ifdef CONFIG_64BIT
68	u64 __iomem *dst = to;
69	const u64 *src = from;
70	const u64 *end = src + count;
71
72	while (src < end)
73		__raw_writeq(*src++, dst++);
74#else
75	__iowrite32_copy(to, from, count * 2);
76#endif
77}
78
79EXPORT_SYMBOL_GPL(__iowrite64_copy);
80