LXR linux/arch/mips/lib/iomap

   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