arch/mips/lib/iomap_copy.c

   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);