iomap_copy.c

// 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);