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 #ifndef __iowrite32_copy
__iowrite32_copy(void __iomem * to,const void * from,size_t count)20 void __iowrite32_copy(void __iomem *to, const void *from, size_t count)
21 {
22 	u32 __iomem *dst = to;
23 	const u32 *src = from;
24 	const u32 *end = src + count;
25 
26 	while (src < end)
27 		__raw_writel(*src++, dst++);
28 }
29 EXPORT_SYMBOL_GPL(__iowrite32_copy);
30 #endif
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  */
__ioread32_copy(void * to,const void __iomem * from,size_t count)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 #ifndef __iowrite64_copy
__iowrite64_copy(void __iomem * to,const void * from,size_t count)64 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
65 {
66 #ifdef CONFIG_64BIT
67 	u64 __iomem *dst = to;
68 	const u64 *src = from;
69 	const u64 *end = src + count;
70 
71 	while (src < end)
72 		__raw_writeq(*src++, dst++);
73 #else
74 	__iowrite32_copy(to, from, count * 2);
75 #endif
76 }
77 EXPORT_SYMBOL_GPL(__iowrite64_copy);
78 #endif
79