new video driver for bus vcxk framebuffers

This patch adds a new video driver

* adds common bus_vcxk framebuffer driver

Signed-off-by: Jens Scharsig <esw@bus-elektronik.de>
[agust@denx.de: fixed lots of style issues before applying]
Signed-off-by: Anatolij Gustschin <agust@denx.de>

include/bus_vcxk.h

@@ -0,0 +1,36 @@
+/*
+ * (C) Copyright 2005-2009
+ * Jens Scharsig @ BuS Elektronik GmbH & Co. KG, <esw@bus-elektronik.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __BUS_VCXK_H_
+#define __BUS_VCXK_H_
+
+extern int vcxk_init(unsigned long width, unsigned long height);
+extern void vcxk_setpixel(int x, int y, unsigned long color);
+extern int vcxk_acknowledge_wait(void);
+extern int vcxk_request(void);
+extern void vcxk_loadimage(ulong source);
+extern int vcxk_display_bitmap(ulong addr, int x, int y);
+extern void vcxk_setbrightness(unsigned int side, short brightness);
+extern int video_display_bitmap(ulong addr, int x, int y);
+
+#endif