| // SPDX-License-Identifier: GPL-2.0-only |
| |
| #include <linux/export.h> |
| #include <linux/io.h> |
| |
| /** |
| * __ioread64_copy - copy data from MMIO space, in 64-bit units |
| * @to: destination (must be 64-bit aligned) |
| * @from: source, in MMIO space (must be 64-bit aligned) |
| * @count: number of 64-bit quantities to copy |
| * |
| * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a |
| * time. Order of access is not guaranteed, nor is a memory barrier |
| * performed afterwards. |
| */ |
| void __ioread64_copy(void *to, const void __iomem *from, size_t count) |
| { |
| #ifdef CONFIG_64BIT |
| u64 *dst = to; |
| const u64 __iomem *src = from; |
| const u64 __iomem *end = src + count; |
| |
| while (src < end) |
| *dst++ = __raw_readq(src++); |
| #else |
| __ioread32_copy(to, from, count * 2); |
| #endif |
| } |
| EXPORT_SYMBOL_GPL(__ioread64_copy); |
