]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - lib/iomap_copy.c
Merge branch 'for-4.5/nvme' of git://git.kernel.dk/linux-block
[mirror_ubuntu-bionic-kernel.git] / 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/export.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 */
31 void __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 }
42 EXPORT_SYMBOL_GPL(__iowrite32_copy);
43
44 /**
45 * __ioread32_copy - copy data from MMIO space, in 32-bit units
46 * @to: destination (must be 32-bit aligned)
47 * @from: source, in MMIO space (must be 32-bit aligned)
48 * @count: number of 32-bit quantities to copy
49 *
50 * Copy data from MMIO space to kernel space, in units of 32 bits at a
51 * time. Order of access is not guaranteed, nor is a memory barrier
52 * performed afterwards.
53 */
54 void __ioread32_copy(void *to, const void __iomem *from, size_t count)
55 {
56 u32 *dst = to;
57 const u32 __iomem *src = from;
58 const u32 __iomem *end = src + count;
59
60 while (src < end)
61 *dst++ = __raw_readl(src++);
62 }
63 EXPORT_SYMBOL_GPL(__ioread32_copy);
64
65 /**
66 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
67 * @to: destination, in MMIO space (must be 64-bit aligned)
68 * @from: source (must be 64-bit aligned)
69 * @count: number of 64-bit quantities to copy
70 *
71 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
72 * time. Order of access is not guaranteed, nor is a memory barrier
73 * performed afterwards.
74 */
75 void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
76 const void *from,
77 size_t count)
78 {
79 #ifdef CONFIG_64BIT
80 u64 __iomem *dst = to;
81 const u64 *src = from;
82 const u64 *end = src + count;
83
84 while (src < end)
85 __raw_writeq(*src++, dst++);
86 #else
87 __iowrite32_copy(to, from, count * 2);
88 #endif
89 }
90
91 EXPORT_SYMBOL_GPL(__iowrite64_copy);