/* SPDX-License-Identifier: BSD-2-Clause */

/*
 * Copyright (c) 2018 embedded brains GmbH.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <bsp/iocopy.h>

static void atsam_do_copy(
  uint8_t *dst,
  const uint8_t *src,
  size_t n,
  bool aligned
)
{
  if (aligned) {
    while (n > 3) {
      *(uint32_t *)dst = *(uint32_t *)src;
      dst += 4;
      src += 4;
      n -= 4;
    }
  }

  while (n > 0) {
    *dst = *src;
    ++dst;
    ++src;
    --n;
  }
}

void atsam_copy_to_io(void *dst, const void *src, size_t n)
{
  atsam_do_copy(dst, src, n, ((uintptr_t)dst) % 4 == 0);
}

void atsam_copy_from_io(void *dst, const void *src, size_t n)
{
  atsam_do_copy(dst, src, n, ((uintptr_t)src) % 4 == 0);
}