// SPDX-License-Identifier: GPL-2.0-or-later

  /*

   *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>

   * 

   *  Misc memory accessors

   */

  #include <linux/export.h>

  #include <linux/io.h>

  #include <linux/uaccess.h>

  #include <sound/core.h>

  
  /**

   * copy_to_user_fromio - copy data from mmio-space to user-space
   * @dst: the destination pointer on user-space
   * @src: the source pointer on mmio
   * @count: the data size to copy in bytes
   *
   * Copies the data from mmio-space to user-space.
   *

   * Return: Zero if successful, or non-zero on failure.

   */
  int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
  {
  #if defined(__i386__) || defined(CONFIG_SPARC32)

  	return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;

  #else
  	char buf[256];
  	while (count) {
  		size_t c = count;
  		if (c > sizeof(buf))
  			c = sizeof(buf);
  		memcpy_fromio(buf, (void __iomem *)src, c);
  		if (copy_to_user(dst, buf, c))
  			return -EFAULT;
  		count -= c;
  		dst += c;
  		src += c;
  	}
  	return 0;
  #endif
  }

  EXPORT_SYMBOL(copy_to_user_fromio);

  /**
   * copy_from_user_toio - copy data from user-space to mmio-space
   * @dst: the destination pointer on mmio-space
   * @src: the source pointer on user-space
   * @count: the data size to copy in bytes
   *
   * Copies the data from user-space to mmio-space.
   *

   * Return: Zero if successful, or non-zero on failure.

   */
  int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
  {
  #if defined(__i386__) || defined(CONFIG_SPARC32)

  	return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;

  #else
  	char buf[256];
  	while (count) {
  		size_t c = count;
  		if (c > sizeof(buf))
  			c = sizeof(buf);
  		if (copy_from_user(buf, src, c))
  			return -EFAULT;
  		memcpy_toio(dst, buf, c);
  		count -= c;
  		dst += c;
  		src += c;
  	}
  	return 0;
  #endif
  }

  EXPORT_SYMBOL(copy_from_user_toio);