| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 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); |