m68k: Atari fb revival

Update the atari fb to 2.6 by Michael Schmitz,
Reformatting and rewrite of bit plane functions by Roman Zippel,
A few more fixes by Geert Uytterhoeven.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/atafb_mfb.c

@@ -0,0 +1,112 @@
+/*
+ *  linux/drivers/video/mfb.c -- Low level frame buffer operations for
+ *				 monochrome
+ *
+ *	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 "atafb.h"
+#include "atafb_utils.h"
+
+
+    /*
+     *  Monochrome
+     */
+
+void atafb_mfb_copyarea(struct fb_info *info, u_long next_line,
+			int sy, int sx, int dy, int dx,
+			int height, int width)
+{
+	u8 *src, *dest;
+	u_int rows;
+
+	if (sx == 0 && dx == 0 && width == next_line) {
+		src = (u8 *)info->screen_base + sy * (width >> 3);
+		dest = (u8 *)info->screen_base + dy * (width >> 3);
+		fb_memmove(dest, src, height * (width >> 3));
+	} else if (dy <= sy) {
+		src = (u8 *)info->screen_base + sy * next_line + (sx >> 3);
+		dest = (u8 *)info->screen_base + dy * next_line + (dx >> 3);
+		for (rows = height; rows--;) {
+			fb_memmove(dest, src, width >> 3);
+			src += next_line;
+			dest += next_line;
+		}
+	} else {
+		src = (u8 *)info->screen_base + (sy + height - 1) * next_line + (sx >> 3);
+		dest = (u8 *)info->screen_base + (dy + height - 1) * next_line + (dx >> 3);
+		for (rows = height; rows--;) {
+			fb_memmove(dest, src, width >> 3);
+			src -= next_line;
+			dest -= next_line;
+		}
+	}
+}
+
+void atafb_mfb_fillrect(struct fb_info *info, u_long next_line, u32 color,
+			int sy, int sx, int height, int width)
+{
+	u8 *dest;
+	u_int rows;
+
+	dest = (u8 *)info->screen_base + sy * next_line + (sx >> 3);
+
+	if (sx == 0 && width == next_line) {
+		if (color)
+			fb_memset255(dest, height * (width >> 3));
+		else
+			fb_memclear(dest, height * (width >> 3));
+	} else {
+		for (rows = height; rows--; dest += next_line) {
+			if (color)
+				fb_memset255(dest, width >> 3);
+			else
+				fb_memclear_small(dest, width >> 3);
+		}
+	}
+}
+
+void atafb_mfb_linefill(struct fb_info *info, u_long next_line,
+			int dy, int dx, u32 width,
+			const u8 *data, u32 bgcolor, u32 fgcolor)
+{
+	u8 *dest;
+	u_int rows;
+
+	dest = (u8 *)info->screen_base + dy * next_line + (dx >> 3);
+
+	for (rows = width / 8; rows--; /* check margins */ ) {
+		// use fast_memmove or fb_memmove
+		*dest++ = *data++;
+	}
+}
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+
+int init_module(void)
+{
+	return 0;
+}
+
+void cleanup_module(void)
+{
+}
+#endif /* MODULE */
+
+
+    /*
+     *  Visible symbols for modules
+     */
+
+EXPORT_SYMBOL(atafb_mfb_copyarea);
+EXPORT_SYMBOL(atafb_mfb_fillrect);
+EXPORT_SYMBOL(atafb_mfb_linefill);