path: root/drivers/video/vga16fb.c

/*
 * linux/drivers/video/vga16.c -- VGA 16-color framebuffer driver
 * 
 * Copyright 1999 Ben Pfaff <pfaffben@debian.org> and Petr Vandrovec <VANDROVE@vc.cvut.cz>
 * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
 * Based on VESA framebuffer (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *
 * 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/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>

#include <asm/io.h>
#include <video/vga.h>

#define GRAPHICS_ADDR_REG VGA_GFX_I	/* Graphics address register. */
#define GRAPHICS_DATA_REG VGA_GFX_D	/* Graphics data register. */

#define SET_RESET_INDEX 	VGA_GFX_SR_VALUE	/* Set/Reset Register index. */
#define ENABLE_SET_RESET_INDEX	VGA_GFX_SR_ENABLE	/* Enable Set/Reset Register index. */
#define DATA_ROTATE_INDEX	VGA_GFX_DATA_ROTATE	/* Data Rotate Register index. */
#define GRAPHICS_MODE_INDEX	VGA_GFX_MODE		/* Graphics Mode Register index. */
#define BIT_MASK_INDEX		VGA_GFX_BIT_MASK	/* Bit Mask Register index. */

#define dac_reg	(VGA_PEL_IW)
#define dac_val	(VGA_PEL_D)

#define VGA_FB_PHYS 0xA0000
#define VGA_FB_PHYS_LEN 65536

#define MODE_SKIP4	1
#define MODE_8BPP	2
#define MODE_CFB	4
#define MODE_TEXT	8

/* --------------------------------------------------------------------- */

/*
 * card parameters
 */

struct vga16fb_par {
	/* structure holding original VGA register settings when the
           screen is blanked */
	struct {
		unsigned char	SeqCtrlIndex;	  /* Sequencer Index reg.   */
		unsigned char	CrtCtrlIndex;	  /* CRT-Contr. Index reg.  */
		unsigned char	CrtMiscIO;	  /* Miscellaneous register */
		unsigned