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 */
16void __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}
29EXPORT_SYMBOL_GPL(__ioread64_copy);
30