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 */
19 void __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 }
30 EXPORT_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 */
42 void __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 }
51 EXPORT_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 */
63 void __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
79 EXPORT_SYMBOL_GPL(__iowrite64_copy);