/*
 *  linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for
 *				      interleaved bitplanes à la Atari (2
 *				      planes, 2 bytes interleave)
 *
 *	Created 5 Apr 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>

#include <asm/setup.h>

#include "atafb.h"

#define BPL	2
#include "atafb_utils.h"

void atafb_iplan2p2_copyarea(struct fb_info *info, u_long next_line,
			     int sy, int sx, int dy, int dx,
			     int height, int width)
{
	/*  bmove() has to distinguish two major cases: If both, source and
	 *  destination, start at even addresses or both are at odd
	 *  addresses, just the first odd and last even column (if present)
	 *  require special treatment (memmove_col()). The rest between
	 *  then can be copied by normal operations, because all adjacent
	 *  bytes are affected and are to be stored in the same order.
	 *    The pathological case is when the move should go from an odd
	 *  address to an even or vice versa. Since the bytes in the plane
	 *  words must be assembled in new order, it seems wisest to make
	 *  all movements by memmove_col().
	 */

	u8 *src, *dst;
	u32 *s, *d;
	int w, l , i, j;
	u_int colsize;
	u_int upwards = (dy < sy) || (dy == sy && dx < sx);

	colsize = height;
	if (!((sx ^ dx) & 15)) {
		/* odd->odd or even->even */