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(val: *src++, addr: 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(addr: 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(val: *src++, addr: dst++);
74#else
75 __iowrite32_copy(to, from, count * 2);
76#endif
77}
78
79EXPORT_SYMBOL_GPL(__iowrite64_copy);
80

source code of linux/lib/iomap_copy.c