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775c8a3d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d8c825e2 PB |
2 | |
3 | #include <linux/export.h> | |
4 | #include <linux/io.h> | |
5 | ||
6 | /** | |
7 | * __ioread64_copy - copy data from MMIO space, in 64-bit units | |
8 | * @to: destination (must be 64-bit aligned) | |
9 | * @from: source, in MMIO space (must be 64-bit aligned) | |
10 | * @count: number of 64-bit quantities to copy | |
11 | * | |
12 | * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a | |
13 | * time. Order of access is not guaranteed, nor is a memory barrier | |
14 | * performed afterwards. | |
15 | */ | |
16 | void __ioread64_copy(void *to, const void __iomem *from, size_t count) | |
17 | { | |
18 | #ifdef CONFIG_64BIT | |
19 | u64 *dst = to; | |
20 | const u64 __iomem *src = from; | |
21 | const u64 __iomem *end = src + count; | |
22 | ||
23 | while (src < end) | |
24 | *dst++ = __raw_readq(src++); | |
25 | #else | |
26 | __ioread32_copy(to, from, count * 2); | |
27 | #endif | |
28 | } | |
29 | EXPORT_SYMBOL_GPL(__ioread64_copy); |