path: root/drivers/video/stifb.c

/*
 * linux/drivers/video/stifb.c - 
 * Low level Frame buffer driver for HP workstations with 
 * STI (standard text interface) video firmware.
 *
 * Copyright (C) 2001-2006 Helge Deller <deller@gmx.de>
 * Portions Copyright (C) 2001 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 * 
 * Based on:
 * - linux/drivers/video/artistfb.c -- Artist frame buffer driver
 *	Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
 *   - based on skeletonfb, which was
 *	Created 28 Dec 1997 by Geert Uytterhoeven
 * - HP Xhp cfb-based X11 window driver for XFree86
 *	(c)Copyright 1992 Hewlett-Packard Co.
 *
 * 
 *  The following graphics display devices (NGLE family) are supported by this driver:
 *
 *  HPA4070A	known as "HCRX", a 1280x1024 color device with 8 planes
 *  HPA4071A	known as "HCRX24", a 1280x1024 color device with 24 planes,
 *		optionally available with a hardware accelerator as HPA4071A_Z
 *  HPA1659A	known as "CRX", a 1280x1024 color device with 8 planes
 *  HPA1439A	known as "CRX24", a 1280x1024 color device with 24 planes,
 *		optionally available with a hardware accelerator.
 *  HPA1924A	known as "GRX", a 1280x1024 grayscale device with 8 planes
 *  HPA2269A	known as "Dual CRX", a 1280x1024 color device with 8 planes,
 *		implements support for two displays on a single graphics card.
 *  HP710C	internal graphics support optionally available on the HP9000s710 SPU,
 *		supports 1280x1024 color displays with 8 planes.
 *  HP710G	same as HP710C, 1280x1024 grayscale only
 *  HP710L	same as HP710C, 1024x768 color only
 *  HP712	internal graphics support on HP9000s712 SPU, supports 640x480, 
 *		1024x768 or 1280x1024 color displays on 8 planes (Artist)
 *
 * 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.
 */

/* TODO:
 *	- 1bpp mode is completely untested
 *	- add support for h/w acceleration
 *	- add hardware cursor
 *	- automatically disable double buffering (e.g. on RDI precisionbook laptop)
 */


/* on supported graphic devices you may:
 * #define FALLBACK_TO_1BPP to fall back to 1 bpp, or
 * #undef  FALLBACK_TO_1BPP to reject support for unsupported cards */
#undef FALLBACK_TO_1BPP

#undef DEBUG_STIFB_REGS		/* debug sti register accesses */


#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/init.h>
#include <linux/ioport.h>

#include <asm/grfioctl.h>	/* for HP-UX compatibility */
#include <asm/uaccess.h>

#include "sticore.h"

/* REGION_BASE(fb_info, index) returns the virtual address for region <index> */
#define REGION_BASE(fb_info, index) \
	F_EXTEND(fb_info->sti->glob_cfg->region_ptrs[index])

#define NGLEDEVDEPROM_CRT_REGION 1

#define NR_PALETTE 256

typedef struct {
	__s32	video_config_reg;
	__s32	misc_video_start;
	__s32	horiz_timing_fmt;
	__s32	serr_timing_fmt;
	__s32	vert_timing_fmt;
	__s32	horiz_state;
	__s32	vert_state;
	__s32	vtg_state_elements;
	__s32	pipeline_delay;
	__s32	misc_video_end;
} video_setup_t;

typedef struct {                  
	__s16	sizeof_ngle_data;
	__s16	x_size_visible;	    /* visible screen dim in pixels  */
	__s16	y_size_visible;
	__s16	pad2[15];
	__s16	cursor_pipeline_delay;
	__s16	video_interleaves;
	__s32