Root/lib/iomap_copy.c

1/*
2 * Copyright 2006 PathScale, Inc. All Rights Reserved.
3 *
4 * This file is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
16 */
17
18#include <linux/module.h>
19#include <linux/io.h>
20
21/**
22 * __iowrite32_copy - copy data to MMIO space, in 32-bit units
23 * @to: destination, in MMIO space (must be 32-bit aligned)
24 * @from: source (must be 32-bit aligned)
25 * @count: number of 32-bit quantities to copy
26 *
27 * Copy data from kernel space to MMIO space, in units of 32 bits at a
28 * time. Order of access is not guaranteed, nor is a memory barrier
29 * performed afterwards.
30 */
31void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
32                        const void *from,
33                        size_t count)
34{
35    u32 __iomem *dst = to;
36    const u32 *src = from;
37    const u32 *end = src + count;
38
39    while (src < end)
40        __raw_writel(*src++, dst++);
41}
42EXPORT_SYMBOL_GPL(__iowrite32_copy);
43
44/**
45 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
46 * @to: destination, in MMIO space (must be 64-bit aligned)
47 * @from: source (must be 64-bit aligned)
48 * @count: number of 64-bit quantities to copy
49 *
50 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
51 * time. Order of access is not guaranteed, nor is a memory barrier
52 * performed afterwards.
53 */
54void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
55                        const void *from,
56                        size_t count)
57{
58#ifdef CONFIG_64BIT
59    u64 __iomem *dst = to;
60    const u64 *src = from;
61    const u64 *end = src + count;
62
63    while (src < end)
64        __raw_writeq(*src++, dst++);
65#else
66    __iowrite32_copy(to, from, count * 2);
67#endif
68}
69
70EXPORT_SYMBOL_GPL(__iowrite64_copy);
71

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