aboutsummaryrefslogtreecommitdiff
path: root/lib/iomap_copy.c
blob: 5de7c04e05ef56f53e15430f6882eac4fb55113d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2006 PathScale, Inc.  All Rights Reserved.
 */

#include <linux/export.h>
#include <linux/io.h>

/**
 * __iowrite32_copy - copy data to MMIO space, in 32-bit units
 * @to: destination, in MMIO space (must be 32-bit aligned)
 * @from: source (must be 32-bit aligned)
 * @count: number of 32-bit quantities to copy
 *
 * Copy data from kernel space to MMIO space, in units of 32 bits at a
 * time.  Order of access is not guaranteed, nor is a memory barrier
 * performed afterwards.
 */
void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
					    const void *from,
					    size_t count)
{
	u32 __iomem *dst = to;
	const u32 *src = from;
	const u32 *end = src + count;

	while (src < end)
		__raw_writel(*src++, dst++);
}
EXPORT_SYMBOL_GPL(__iowrite32_copy);

/**
 * __ioread32_copy - copy data from MMIO space, in 32-bit units
 * @to: destination (must be 32-bit aligned)
 * @from: source, in MMIO space (must be 32-bit aligned)
 * @count: number of 32-bit quantities to copy
 *
 * Copy data from MMIO space to kernel space, in units of 32 bits at a
 * time.  Order of access is not guaranteed, nor is a memory barrier
 * performed afterwards.
 */
void __ioread32_copy(void *to, const void __iomem *from, size_t count)
{
	u32 *dst = to;
	const u32 __iomem *src = from;
	const u32 __iomem *end = src + count;

	while (src < end)
		*dst++ = __raw_readl(src++);
}
EXPORT_SYMBOL_GPL(__ioread32_copy);

/**
 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
 * @to: destination, in MMIO space (must be 64-bit aligned)
 * @from: source (must be 64-bit aligned)
 * @count: number of 64-bit quantities to copy
 *
 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
 * time.  Order of access is not guaranteed, nor is a memory barrier
 * performed afterwards.
 */
void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
					    const void *from,
					    size_t count)
{
#ifdef CONFIG_64BIT
	u64 __iomem *dst = to;
	const u64 *src = from;
	const u64 *end = src + count;

	while (src < end)
		__raw_writeq(*src++, dst++);
#else
	__iowrite32_copy(to, from, count * 2);
#endif
}

EXPORT_SYMBOL_GPL(__iowrite64_copy);