/* $XFree86$ */
/* $XdotOrg$ */
/*
 * Mode initializing code (CRT1 section) for
 * for SiS 300/305/540/630/730,
 *     SiS 315/550/[M]650/651/[M]661[FGM]X/[M]74x[GX]/330/[M]76x[GX],
 *     XGI Volari V3XT/V5/V8, Z7
 * (Universal module for Linux kernel framebuffer and X.org/XFree86 4.x)
 *
 * Copyright (C) 2001-2005 by Thomas Winischhofer, Vienna, Austria
 *
 * If distributed as part of the Linux kernel, the following license terms
 * apply:
 *
 * * 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 named License,
 * * or 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
 *
 * Otherwise, the following license terms apply:
 *
 * * Redistribution and use in source and binary forms, with or without
 * * modification, are permitted provided that the following conditions
 * * are met:
 * * 1) Redistributions of source code must retain the above copyright
 * *    notice, this list of conditions and the following disclaimer.
 * * 2) Redistributions in binary form must reproduce the above copyright
 * *    notice, this list of conditions and the following disclaimer in the
 * *    documentation and/or other materials provided with the distribution.
 * * 3) The name of the author may not be used to endorse or promote products
 * *    derived from this software without specific prior written permission.
 * *
 * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: 	Thomas Winischhofer <thomas@winischhofer.net>
 *
 * Formerly based on non-functional code-fragements for 300 series by SiS, Inc.
 * Used by permission.
 */

#include "init.h"

#ifdef CONFIG_FB_SIS_300
#include "300vtbl.h"
#endif

#ifdef CONFIG_FB_SIS_315
#include "310vtbl.h"
#endif

#if defined(ALLOC_PRAGMA)
#pragma alloc_text(PAGE,SiSSetMode)
#endif

/*********************************************/
/*         POINTER INITIALIZATION            */
/*********************************************/

#if defined(CONFIG_FB_SIS_300) || defined(CONFIG_FB_SIS_315)
static void
InitCommonPointer(struct SiS_Private *SiS_Pr)
{
   SiS_Pr->SiS_SModeIDTable  = SiS_SModeIDTable;
   SiS_Pr->SiS_StResInfo     = SiS_StResInfo;
   SiS_Pr->SiS_ModeResInfo   = SiS_ModeResInfo;
   SiS_Pr->SiS_StandTable    = SiS_StandTable;

   SiS_Pr->SiS_NTSCTiming     = SiS_NTSCTiming;
   SiS_Pr->SiS_PALTiming      = SiS_PALTiming;
   SiS_Pr->SiS_HiTVSt1Timing  = SiS_HiTVSt1Timing;
   SiS_Pr->SiS_HiTVSt2Timing  = SiS_HiTVSt2Timing;

   SiS_Pr->SiS_HiTVExtTiming  = SiS_HiTVExtTiming;
   SiS_Pr->SiS_HiTVGroup3Data = SiS_HiTVGroup3Data;
   SiS_Pr->SiS_HiTVGroup3Simu = SiS_HiTVGroup3Simu;
#if 0
   SiS_Pr->SiS_HiTVTextTiming = SiS_HiTVTextTiming;
   SiS_Pr->SiS_HiTVGroup3Text = SiS_HiTVGroup3Text;
#endif

   SiS_Pr->SiS_StPALData   = SiS_StPALData;
   SiS_Pr->SiS_ExtPALData  = SiS_ExtPALData;
   SiS_Pr->SiS_StNTSCData  = SiS_StNTSCData;
   SiS_Pr->SiS_ExtNTSCData = SiS_ExtNTSCData;
   SiS_Pr->SiS_St1HiTVData = SiS_StHiTVData;
   SiS_Pr->SiS_St2HiTVData = SiS_St2HiTVData;
   SiS_Pr->SiS_ExtHiTVData = SiS_ExtHiTVData;
   SiS_Pr->SiS_St525iData  = SiS_StNTSCData;
   SiS_Pr->SiS_St525pData  = SiS_St525pData;
   SiS_Pr->SiS_St750pData  = SiS_St750pData;
   SiS_Pr->SiS_Ext525iData = SiS_ExtNTSCData;
   SiS_Pr->SiS_Ext525pData = SiS_ExtNTSCData;
   SiS_Pr->SiS_Ext750pData = SiS_Ext750pData;

   SiS_Pr->pSiS_OutputSelect = &SiS_OutputSelect;
   SiS_Pr->pSiS_SoftSetting  = &SiS_SoftSetting;

   SiS_Pr->SiS_LCD1280x720Data      = SiS_LCD1280x720Data;
   SiS_Pr->SiS_StLCD1280x768_2Data  = SiS_StLCD1280x768_2Data;
   SiS_Pr->SiS_ExtLCD1280x768_2Data = SiS_ExtLCD1280x768_2Data;
   SiS_Pr->SiS_LCD1280x800Data      = SiS_LCD1280x800Data;
   SiS_Pr->SiS_LCD1280x800_2Data    = SiS_LCD1280x800_2Data;
   SiS_Pr->SiS_LCD1280x854Data      = SiS_LCD1280x854Data;
   SiS_Pr->SiS_LCD1280x960Data      = SiS_LCD1280x960Data;
   SiS_Pr->SiS_StLCD1400x1050Data   = SiS_StLCD1400x1050Data;
   SiS_Pr->SiS_ExtLCD1400x1050Data  = SiS_ExtLCD1400x1050Data;
   SiS_Pr->SiS_LCD1680x1050Data     = SiS_LCD1680x1050Data;
   SiS_Pr->SiS_StLCD1600x1200Data   = SiS_StLCD1600x1200Data;
   SiS_Pr->SiS_ExtLCD1600x1200Data  = SiS_ExtLCD1600x1200Data;
   SiS_Pr->SiS_NoScaleData          = SiS_NoScaleData;

   SiS_Pr->SiS_LVDS320x240Data_1   = SiS_LVDS320x240Data_1;
   SiS_Pr->SiS_LVDS320x240Data_2   = SiS_LVDS320x240Data_2;
   SiS_Pr->SiS_LVDS640x480Data_1   = SiS_LVDS640x480Data_1;
   SiS_Pr->SiS_LVDS800x600Data_1   = SiS_LVDS800x600Data_1;
   SiS_Pr->SiS_LVDS1024x600Data_1  = SiS_LVDS1024x600Data_1;
   SiS_Pr->SiS_LVDS1024x768Data_1  = SiS_LVDS1024x768Data_1;

   SiS_Pr->SiS_LVDSCRT1320x240_1     = SiS_LVDSCRT1320x240_1;
   SiS_Pr->SiS_LVDSCRT1320x240_2     = SiS_LVDSCRT1320x240_2;
   SiS_Pr->SiS_LVDSCRT1320x240_2_H   = SiS_LVDSCRT1320x240_2_H;
   SiS_Pr->SiS_LVDSCRT1320x240_3     = SiS_LVDSCRT1320x240_3;
   SiS_Pr->SiS_LVDSCRT1320x240_3_H   = SiS_LVDSCRT1320x240_3_H;
   SiS_Pr->SiS_LVDSCRT1640x480_1     = SiS_LVDSCRT1640x480_1;
   SiS_Pr->SiS_LVDSCRT1640x480_1_H   = SiS_LVDSCRT1640x480_1_H;
#if 0
   SiS_Pr->SiS_LVDSCRT11024x600_1    = SiS_LVDSCRT11024x600_1;
   SiS_Pr->SiS_LVDSCRT11024x600_1_H  = SiS_LVDSCRT11024x600_1_H;
   SiS_Pr->SiS_LVDSCRT11024x600_2    = SiS_LVDSCRT11024x600_2;
   SiS_Pr->SiS_LVDSCRT11024x600_2_H  = SiS_LVDSCRT11024x600_2_H;
#endif

   SiS_Pr->SiS_CHTVUNTSCData = SiS_CHTVUNTSCData;
   SiS_Pr->SiS_CHTVONTSCData = SiS_CHTVONTSCData;

   SiS_Pr->SiS_PanelMinLVDS   = Panel_800x600;    /* lowest value LVDS/LCDA */
   SiS_Pr->SiS_PanelMin301    = Panel_1024x768;   /* lowest value 301 */
}
#endif

#ifdef CONFIG_FB_SIS_300
static void
InitTo300Pointer(struct SiS_Private *SiS_Pr)
{
   InitCommonPointer(SiS_Pr);

   SiS_Pr->SiS_VBModeIDTable = SiS300_VBModeIDTable;
   SiS_Pr->SiS_EModeIDTable  = SiS300_EModeIDTable;
   SiS_Pr->SiS_RefIndex      = SiS300_RefIndex;
   SiS_Pr->SiS_CRT1Table     = SiS300_CRT1Table;
   if(SiS_Pr->ChipType == SIS_300) {
      SiS_Pr->SiS_MCLKData_0 = SiS300_MCLKData_300; /* 300 */
   } else {
      SiS_Pr->SiS_MCLKData_0 = SiS300_MCLKData_630; /* 630, 730 */
   }
   SiS_Pr->SiS_VCLKData      = SiS300_VCLKData;
   SiS_Pr->SiS_VBVCLKData    = (struct SiS_VBVCLKData *)SiS300_VCLKData;

   SiS_Pr->SiS_SR15  = SiS300_SR15;

   SiS_Pr->SiS_PanelDelayTbl     = SiS300_PanelDelayTbl;
   SiS_Pr->SiS_PanelDelayTblLVDS = SiS300_PanelDelayTbl;

   SiS_Pr->SiS_ExtLCD1024x768Data   = SiS300_ExtLCD1024x768Data;
   SiS_Pr->SiS_St2LCD1024x768Data   = SiS300_St2LCD1024x768Data;
   SiS_Pr->SiS_ExtLCD1280x1024Data  = SiS300_ExtLCD1280x1024Data;
   SiS_Pr->SiS_St2LCD1280x1024Data  = SiS300_St2LCD1280x1024Data;

   SiS_Pr->SiS_CRT2Part2_1024x768_1  = SiS300_CRT2Part2_1024x768_1;
   SiS_Pr->SiS_CRT2Part2_1024x768_2  = SiS300_CRT2Part2_1024x768_2;
   SiS_Pr->SiS_CRT2Part2_1024x768_3  = SiS300_CRT2Part2_1024x768_3;

   SiS_Pr->SiS_CHTVUPALData  = SiS300_CHTVUPALData;
   SiS_Pr->SiS_CHTVOPALData  = SiS300_CHTVOPALData;
   SiS_Pr->SiS_CHTVUPALMData = SiS_CHTVUNTSCData;    /* not supported on 300 series */
   SiS_Pr->SiS_CHTVOPALMData = SiS_CHTVONTSCData;    /* not supported on 300 series */
   SiS_Pr->SiS_CHTVUPALNData = SiS300_CHTVUPALData;  /* not supported on 300 series */
   SiS_Pr->SiS_CHTVOPALNData = SiS300_CHTVOPALData;  /* not supported on 300 series */
   SiS_Pr->SiS_CHTVSOPALData = SiS300_CHTVSOPALData;

   SiS_Pr->SiS_LVDS848x480Data_1   = SiS300_LVDS848x480Data_1;
   SiS_Pr->SiS_LVDS848x480Data_2   = SiS300_LVDS848x480Data_2;
   SiS_Pr->SiS_LVDSBARCO1024Data_1 = SiS300_LVDSBARCO1024Data_1;
   SiS_Pr->SiS_LVDSBARCO1366Data_1 = SiS300_LVDSBARCO1366Data_1;
   SiS_Pr->SiS_LVDSBARCO1366Data_2 = SiS300_LVDSBARCO1366Data_2;

   SiS_Pr->SiS_PanelType04_1a = SiS300_PanelType04_1a;
   SiS_Pr->SiS_PanelType04_2a = SiS300_PanelType04_2a;
   SiS_Pr->SiS_PanelType04_1b = SiS300_PanelType04_1b;
   SiS_Pr->SiS_PanelType04_2b = SiS300_PanelType04_2b;

   SiS_Pr->SiS_CHTVCRT1UNTSC = SiS300_CHTVCRT1UNTSC;
   SiS_Pr->SiS_CHTVCRT1ONTSC = SiS300_CHTVCRT1ONTSC;
   SiS_Pr->SiS_CHTVCRT1UPAL  = SiS300_CHTVCRT1UPAL;
   SiS_Pr->SiS_CHTVCRT1OPAL  = SiS300_CHTVCRT1OPAL;
   SiS_Pr->SiS_CHTVCRT1SOPAL = SiS300_CHTVCRT1SOPAL;
   SiS_Pr->SiS_CHTVReg_UNTSC = SiS300_CHTVReg_UNTSC;
   SiS_Pr->SiS_CHTVReg_ONTSC = SiS300_CHTVReg_ONTSC;
   SiS_Pr->SiS_CHTVReg_UPAL  = SiS300_CHTVReg_UPAL;
   SiS_Pr->SiS_CHTVReg_OPAL  = SiS300_CHTVReg_OPAL;
   SiS_Pr->SiS_CHTVReg_UPALM = SiS300_CHTVReg_UNTSC;  /* not supported on 300 series */
   SiS_Pr->SiS_CHTVReg_OPALM = SiS300_CHTVReg_ONTSC;  /* not supported on 300 series */
   SiS_Pr->SiS_CHTVReg_UPALN = SiS300_CHTVReg_UPAL;   /* not supported on 300 series */
   SiS_Pr->SiS_CHTVReg_OPALN = SiS300_CHTVReg_OPAL;   /* not supported on 300 series */
   SiS_Pr->SiS_CHTVReg_SOPAL = SiS300_CHTVReg_SOPAL;
   SiS_Pr->SiS_CHTVVCLKUNTSC = SiS300_CHTVVCLKUNTSC;
   SiS_Pr->SiS_CHTVVCLKONTSC = SiS300_CHTVVCLKONTSC;
   SiS_Pr->SiS_CHTVVCLKUPAL  = SiS300_CHTVVCLKUPAL;
   SiS_Pr->SiS_CHTVVCLKOPAL  = SiS300_CHTVVCLKOPAL;
   SiS_Pr->SiS_CHTVVCLKUPALM = SiS300_CHTVVCLKUNTSC;  /* not supported on 300 series */
   SiS_Pr->SiS_CHTVVCLKOPALM = SiS300_CHTVVCLKONTSC;  /* not supported on 300 series */
   SiS_Pr->SiS_CHTVVCLKUPALN = SiS300_CHTVVCLKUPAL;   /* not supported on 300 series */
   SiS_Pr->SiS_CHTVVCLKOPALN = SiS300_CHTVVCLKOPAL;   /* not supported on 300 series */
   SiS_Pr->SiS_CHTVVCLKSOPAL = SiS300_CHTVVCLKSOPAL;
}
#endif

#ifdef CONFIG_FB_SIS_315
static void
InitTo310Pointer(struct SiS_Private *SiS_Pr)
{
   InitCommonPointer(SiS_Pr);

   SiS_Pr->SiS_EModeIDTable  = SiS310_EModeIDTable;
   SiS_Pr->SiS_RefIndex      = SiS310_RefIndex;
   SiS_Pr->SiS_CRT1Table     = SiS310_CRT1Table;
   if(SiS_Pr->ChipType >= SIS_340) {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_340;  /* 340 + XGI */
   } else if(SiS_Pr->ChipType >= SIS_761) {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_761;  /* 761 - preliminary */
   } else if(SiS_Pr->ChipType >= SIS_760) {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_760;  /* 760 */
   } else if(SiS_Pr->ChipType >= SIS_661) {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_660;  /* 661/741 */
   } else if(SiS_Pr->ChipType == SIS_330) {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_330;  /* 330 */
   } else if(SiS_Pr->ChipType > SIS_315PRO) {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_650;  /* 550, 650, 740 */
   } else {
      SiS_Pr->SiS_MCLKData_0 = SiS310_MCLKData_0_315;  /* 315 */
   }
   if(SiS_Pr->ChipType >= SIS_340) {
      SiS_Pr->SiS_MCLKData_1 = SiS310_MCLKData_1_340;
   } else {
      SiS_Pr->SiS_MCLKData_1 = SiS310_MCLKData_1;
   }
   SiS_Pr->SiS_VCLKData      = SiS310_VCLKData;
   SiS_Pr->SiS_VBVCLKData    = SiS310_VBVCLKData;

   SiS_Pr->SiS_SR15  = SiS310_SR15;

   SiS_Pr->SiS_PanelDelayTbl     = SiS310_PanelDelayTbl;
   SiS_Pr->SiS_PanelDelayTblLVDS = SiS310_PanelDelayTblLVDS;

   SiS_Pr->SiS_St2LCD1024x768Data   = SiS310_St2LCD1024x768Data;
   SiS_Pr->SiS_ExtLCD1024x768Data   = SiS310_ExtLCD1024x768Data;
   SiS_Pr->SiS_St2LCD1280x1024Data  = SiS310_St2LCD1280x1024Data;
   SiS_Pr->SiS_ExtLCD1280x1024Data  = SiS310_ExtLCD1280x1024Data;

   SiS_Pr->SiS_CRT2Part2_1024x768_1  = SiS310_CRT2Part2_1024x768_1;

   SiS_Pr->SiS_CHTVUPALData  = SiS310_CHTVUPALData;
   SiS_Pr->SiS_CHTVOPALData  = SiS310_CHTVOPALData;
   SiS_Pr->SiS_CHTVUPALMData = SiS310_CHTVUPALMData;
   SiS_Pr->SiS_CHTVOPALMData = SiS310_CHTVOPALMData;
   SiS_Pr->SiS_CHTVUPALNData = SiS310_CHTVUPALNData;
   SiS_Pr->SiS_CHTVOPALNData = SiS310_CHTVOPALNData;
   SiS_Pr->SiS_CHTVSOPALData = SiS310_CHTVSOPALData;

   SiS_Pr->SiS_CHTVCRT1UNTSC = SiS310_CHTVCRT1UNTSC;
   SiS_Pr->SiS_CHTVCRT1ONTSC = SiS310_CHTVCRT1ONTSC;
   SiS_Pr->SiS_CHTVCRT1UPAL  = SiS310_CHTVCRT1UPAL;
   SiS_Pr->SiS_CHTVCRT1OPAL  = SiS310_CHTVCRT1OPAL;
   SiS_Pr->SiS_CHTVCRT1SOPAL = SiS310_CHTVCRT1OPAL;

   SiS_Pr->SiS_CHTVReg_UNTSC = SiS310_CHTVReg_UNTSC;
   SiS_Pr->SiS_CHTVReg_ONTSC = SiS310_CHTVReg_ONTSC;
   SiS_Pr->SiS_CHTVReg_UPAL  = SiS310_CHTVReg_UPAL;
   SiS_Pr->SiS_CHTVReg_OPAL  = SiS310_CHTVReg_OPAL;
   SiS_Pr->SiS_CHTVReg_UPALM = SiS310_CHTVReg_UPALM;
   SiS_Pr->SiS_CHTVReg_OPALM = SiS310_CHTVReg_OPALM;
   SiS_Pr->SiS_CHTVReg_UPALN = SiS310_CHTVReg_UPALN;
   SiS_Pr->SiS_CHTVReg_OPALN = SiS310_CHTVReg_OPALN;
   SiS_Pr->SiS_CHTVReg_SOPAL = SiS310_CHTVReg_OPAL;

   SiS_Pr->SiS_CHTVVCLKUNTSC = SiS310_CHTVVCLKUNTSC;
   SiS_Pr->SiS_CHTVVCLKONTSC = SiS310_CHTVVCLKONTSC;
   SiS_Pr->SiS_CHTVVCLKUPAL  = SiS310_CHTVVCLKUPAL;
   SiS_Pr->SiS_CHTVVCLKOPAL  = SiS310_CHTVVCLKOPAL;
   SiS_Pr->SiS_CHTVVCLKUPALM = SiS310_CHTVVCLKUPALM;
   SiS_Pr->SiS_CHTVVCLKOPALM = SiS310_CHTVVCLKOPALM;
   SiS_Pr->SiS_CHTVVCLKUPALN = SiS310_CHTVVCLKUPALN;
   SiS_Pr->SiS_CHTVVCLKOPALN = SiS310_CHTVVCLKOPALN;
   SiS_Pr->SiS_CHTVVCLKSOPAL = SiS310_CHTVVCLKOPAL;
}
#endif

bool
SiSInitPtr(struct SiS_Private *SiS_Pr)
{
   if(SiS_Pr->ChipType < SIS_315H) {
#ifdef CONFIG_FB_SIS_300
      InitTo300Pointer(SiS_Pr);
#else
      return false;
#endif
   } else {
#ifdef CONFIG_FB_SIS_315
      InitTo310Pointer(SiS_Pr);
#else
      return false;
#endif
   }
   return true;
}

/*********************************************/
/*            HELPER: Get ModeID             */
/*********************************************/

static
unsigned short
SiS_GetModeID(int VGAEngine, unsigned int VBFlags, int HDisplay, int VDisplay,
		int Depth, bool FSTN, int LCDwidth, int LCDheight)
{
   unsigned short ModeIndex = 0;

   switch(HDisplay)
   {
	case 320:
		if(VDisplay == 200) ModeIndex = ModeIndex_320x200[Depth];
		else if(VDisplay == 240) {
			if((VBFlags & CRT2_LCD) && (FSTN))
				ModeIndex = ModeIndex_320x240_FSTN[Depth];
			else
				ModeIndex = ModeIndex_320x240[Depth];
		}
		break;
	case 400:
		if((!(VBFlags & CRT1_LCDA)) || ((LCDwidth >= 800) && (LCDwidth >= 600))) {
			if(VDisplay == 300) ModeIndex = ModeIndex_400x300[Depth];
		}
		break;
	case 512:
		if((!(VBFlags & CRT1_LCDA)) || ((LCDwidth >= 1024) && (LCDwidth >= 768))) {
			if(VDisplay == 384) ModeIndex = ModeIndex_512x384[Depth];
		}
		break;
	case 640:
		if(VDisplay == 480)      ModeIndex = ModeIndex_640x480[Depth];
		else if(VDisplay == 400) ModeIndex = ModeIndex_640x400[Depth];
		break;
	case 720:
		if(VDisplay == 480)      ModeIndex = ModeIndex_720x480[Depth];
		else if(VDisplay == 576) ModeIndex = ModeIndex_720x576[Depth];
		break;
	case 768:
		if(VDisplay == 576) ModeIndex = ModeIndex_768x576[Depth];
		break;
	case 800:
		if(VDisplay == 600)      ModeIndex = ModeIndex_800x600[Depth];
		else if(VDisplay == 480) ModeIndex = ModeIndex_800x480[Depth];
		break;
	case 848:
		if(VDisplay == 480) ModeIndex = ModeIndex_848x480[Depth];
		break;
	case 856:
		if(VDisplay == 480) ModeIndex = ModeIndex_856x480[Depth];
		break;
	case 960:
		if(VGAEngine == SIS_315_VGA) {
			if(VDisplay == 540)      ModeIndex = ModeIndex_960x540[Depth];
			else if(VDisplay == 600) ModeIndex = ModeIndex_960x600[Depth];
		}
		break;
	case 1024:
		if(VDisplay == 576)      ModeIndex = ModeIndex_1024x576[Depth];
		else if(VDisplay == 768) ModeIndex = ModeIndex_1024x768[Depth];
		else if(VGAEngine == SIS_300_VGA) {
			if(VDisplay == 600) ModeIndex = ModeIndex_1024x600[Depth];
		}
		break;
	case 1152:
		if(VDisplay == 864) ModeIndex = ModeIndex_1152x864[Depth];
		if(VGAEngine == SIS_300_VGA) {
			if(VDisplay == 768) ModeIndex = ModeIndex_1152x768[Depth];
		}
		break;
	case 1280:
		switch(VDisplay) {
			case 720:
				ModeIndex = ModeIndex_1280x720[Depth];
				break;
			case 768:
				if(VGAEngine == SIS_300_VGA) {
					ModeIndex = ModeIndex_300_1280x768[Depth];
				} else {
					ModeIndex = ModeIndex_310_1280x768[Depth];
				}
				break;
			case 800:
				if(VGAEngine == SIS_315_VGA) {
					ModeIndex = ModeIndex_1280x800[Depth];
				}
				break;
			case 854:
				if(VGAEngine == SIS_315_VGA) {
					ModeIndex = ModeIndex_1280x854[Depth];
				}
				break;
			case 960:
				ModeIndex = ModeIndex_1280x960[Depth];
				break;
			case 1024:
				ModeIndex = ModeIndex_1280x1024[Depth];
				break;
		}
		break;
	case 1360:
		if(VDisplay == 768) ModeIndex = ModeIndex_1360x768[Depth];
		if(VGAEngine == SIS_300_VGA) {
			if(VDisplay == 1024) ModeIndex = ModeIndex_300_1360x1024[Depth];
		}
		break;
	case 1400:
		if(VGAEngine == SIS_315_VGA) {
			if(VDisplay == 1050) {
				ModeIndex = ModeIndex_1400x1050[Depth];
			}
		}
		break;
	case 1600:
		if(VDisplay == 1200) ModeIndex = ModeIndex_1600x1200[Depth];
		break;
	case 1680:
		if(VGAEngine == SIS_315_VGA) {
			if(VDisplay == 1050) ModeIndex = ModeIndex_1680x1050[Depth];
		}
		break;
	case 1920:
		if(VDisplay == 1440) ModeIndex = ModeIndex_1920x1440[Depth];
		else if(VGAEngine == SIS_315_VGA) {
			if(VDisplay == 1080) ModeIndex = ModeIndex_1920x1080[Depth];
		}
		break;
	case 2048:
		if(VDisplay == 1536) {
			if(VGAEngine == SIS_300_VGA) {
				ModeIndex = ModeIndex_300_2048x1536[Depth];
			} else {
				ModeIndex = ModeIndex_310_2048x1536[Depth];
			}
		}
		break;
   }

   return ModeIndex;
}

unsigned short
SiS_GetModeID_LCD(int VGAEngine, unsigned int VBFlags, int HDisplay, int VDisplay,
		int Depth, bool FSTN, unsigned short CustomT, int LCDwidth, int LCDheight,
		unsigned int VBFlags2)
{
   unsigned short ModeIndex = 0;

   if(VBFlags2 & (VB2_LVDS | VB2_30xBDH)) {

      switch(HDisplay)
      {
	case 320:
	     if((CustomT != CUT_PANEL848) && (CustomT != CUT_PANEL856)) {
		if(VDisplay == 200) {
		   if(!FSTN) ModeIndex = ModeIndex_320x200[Depth];
		} else if(VDisplay == 240) {
		   if(!FSTN) ModeIndex = ModeIndex_320x240[Depth];
		   else if(VGAEngine == SIS_315_VGA) {
		      ModeIndex = ModeIndex_320x240_FSTN[Depth];
		   }
		}
	     }
	     break;
	case 400:
	     if((CustomT != CUT_PANEL848) && (CustomT != CUT_PANEL856)) {
		if(!((VGAEngine == SIS_300_VGA) && (VBFlags2 & VB2_TRUMPION))) {
		   if(VDisplay == 300) ModeIndex = ModeIndex_400x300[Depth];
		}
	     }
	     break;
	case 512:
	     if((CustomT != CUT_PANEL848) && (CustomT != CUT_PANEL856)) {
		if(!((VGAEngine == SIS_300_VGA) && (VBFlags2 & VB2_TRUMPION))) {
		   if(LCDwidth >= 1024 && LCDwidth != 1152 && LCDheight >= 768) {
		      if(VDisplay == 384) {
		         ModeIndex = ModeIndex_512x384[Depth];
		      }
		   }
		}
	     }
	     break;
	case 640:
	     if(VDisplay == 480) ModeIndex = ModeIndex_640x480[Depth];
	     else if(VDisplay == 400) {
		if((CustomT != CUT_PANEL848) && (CustomT != CUT_PANEL856))
		   ModeIndex = ModeIndex_640x400[Depth];
	     }
	     break;
	case 800:
	     if(VDisplay == 600) ModeIndex = ModeIndex_800x600[Depth];
	     break;
	case 848:
	     if(CustomT == CUT_PANEL848) {
	        if(VDisplay == 480) ModeIndex = ModeIndex_848x480[Depth];
	     }
	     break;
	case 856:
	     if(CustomT == CUT_PANEL856) {
	        if(VDisplay == 480) ModeIndex = ModeIndex_856x480[Depth];
	     }
	     break;
	case 1024:
	     if(VDisplay == 768) ModeIndex = ModeIndex_1024x768[Depth];
	     else if(VGAEngine == SIS_300_VGA) {
		if((VDisplay == 600) && (LCDheight == 600)) {
		   ModeIndex = ModeIndex_1024x600[Depth];
		}
	     }
	     break;
	case 1152:
	     if(VGAEngine == SIS_300_VGA) {
		if((VDisplay == 768) && (LCDheight == 768)) {
		   ModeIndex = ModeIndex_1152x768[Depth];
		}
	     }
	     break;
        case 1280:
	     if(VDisplay == 1024) ModeIndex = ModeIndex_1280x1024[Depth];
	     else if(VGAEngine == SIS_315_VGA) {
		if((VDisplay == 768) && (LCDheight == 768)) {
		   ModeIndex = ModeIndex_310_1280x768[Depth];
		}
	     }
	     break;
	case 1360:
	     if(VGAEngine == SIS_300_VGA) {
		if(CustomT == CUT_BARCO1366) {
		   if(VDisplay == 1024) ModeIndex = ModeIndex_300_1360x1024[Depth];
		}
	     }
	     if(CustomT == CUT_PANEL848) {
		if(VDisplay == 768) ModeIndex = ModeIndex_1360x768[Depth];
	     }
	     break;
	case 1400:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 1050) ModeIndex = ModeIndex_1400x1050[Depth];
	     }
	     break;
	case 1600:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 1200) ModeIndex = ModeIndex_1600x1200[Depth];
	     }
	     break;
      }

   } else if(VBFlags2 & VB2_SISBRIDGE) {

      switch(HDisplay)
      {
	case 320:
	     if(VDisplay == 200)      ModeIndex = ModeIndex_320x200[Depth];
	     else if(VDisplay == 240) ModeIndex = ModeIndex_320x240[Depth];
	     break;
	case 400:
	     if(LCDwidth >= 800 && LCDheight >= 600) {
		if(VDisplay == 300) ModeIndex = ModeIndex_400x300[Depth];
	     }
	     break;
	case 512:
	     if(LCDwidth >= 1024 && LCDheight >= 768 && LCDwidth != 1152) {
		if(VDisplay == 384) ModeIndex = ModeIndex_512x384[Depth];
	     }
	     break;
	case 640:
	     if(VDisplay == 480)      ModeIndex = ModeIndex_640x480[Depth];
	     else if(VDisplay == 400) ModeIndex = ModeIndex_640x400[Depth];
	     break;
	case 720:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 480)      ModeIndex = ModeIndex_720x480[Depth];
		else if(VDisplay == 576) ModeIndex = ModeIndex_720x576[Depth];
	     }
	     break;
	case 768:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 576) ModeIndex = ModeIndex_768x576[Depth];
	     }
	     break;
	case 800:
	     if(VDisplay == 600) ModeIndex = ModeIndex_800x600[Depth];
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 480) ModeIndex = ModeIndex_800x480[Depth];
	     }
	     break;
	case 848:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 480) ModeIndex = ModeIndex_848x480[Depth];
	     }
	     break;
	case 856:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 480) ModeIndex = ModeIndex_856x480[Depth];
	     }
	     break;
	case 960:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 540)      ModeIndex = ModeIndex_960x540[Depth];
		else if(VDisplay == 600) ModeIndex = ModeIndex_960x600[Depth];
	     }
	     break;
	case 1024:
	     if(VDisplay == 768) ModeIndex = ModeIndex_1024x768[Depth];
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 576) ModeIndex = ModeIndex_1024x576[Depth];
	     }
	     break;
	case 1152:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 864) ModeIndex = ModeIndex_1152x864[Depth];
	     }
	     break;
	case 1280:
	     switch(VDisplay) {
	     case 720:
		ModeIndex = ModeIndex_1280x720[Depth];
		break;
	     case 768:
		if(VGAEngine == SIS_300_VGA) {
		   ModeIndex = ModeIndex_300_1280x768[Depth];
		} else {
		   ModeIndex = ModeIndex_310_1280x768[Depth];
		}
		break;
	     case 800:
		if(VGAEngine == SIS_315_VGA) {
		   ModeIndex = ModeIndex_1280x800[Depth];
		}
		break;
	     case 854:
		if(VGAEngine == SIS_315_VGA) {
		   ModeIndex = ModeIndex_1280x854[Depth];
		}
		break;
	     case 960:
		ModeIndex = ModeIndex_1280x960[Depth];
		break;
	     case 1024:
		ModeIndex = ModeIndex_1280x1024[Depth];
		break;
	     }
	     break;
	case 1360:
	     if(VGAEngine == SIS_315_VGA) {  /* OVER1280 only? */
		if(VDisplay == 768) ModeIndex = ModeIndex_1360x768[Depth];
	     }
	     break;
	case 1400:
	     if(VGAEngine == SIS_315_VGA) {
		if(VBFlags2 & VB2_LCDOVER1280BRIDGE) {
		   if(VDisplay == 1050) ModeIndex = ModeIndex_1400x1050[Depth];
		}
	     }
	     break;
	case 1600:
	     if(VGAEngine == SIS_315_VGA) {
		if(VBFlags2 & VB2_LCDOVER1280BRIDGE) {
		   if(VDisplay == 1200) ModeIndex = ModeIndex_1600x1200[Depth];
		}
	     }
	     break;
#ifndef VB_FORBID_CRT2LCD_OVER_1600
	case 1680:
	     if(VGAEngine == SIS_315_VGA) {
		if(VBFlags2 & VB2_LCDOVER1280BRIDGE) {
		   if(VDisplay == 1050) ModeIndex = ModeIndex_1680x1050[Depth];
		}
	     }
	     break;
	case 1920:
	     if(VGAEngine == SIS_315_VGA) {
		if(VBFlags2 & VB2_LCDOVER1600BRIDGE) {
		   if(VDisplay == 1440) ModeIndex = ModeIndex_1920x1440[Depth];
		}
	     }
	     break;
	case 2048:
	     if(VGAEngine == SIS_315_VGA) {
		if(VBFlags2 & VB2_LCDOVER1600BRIDGE) {
		   if(VDisplay == 1536) ModeIndex = ModeIndex_310_2048x1536[Depth];
		}
	     }
	     break;
#endif
      }
   }

   return ModeIndex;
}

unsigned short
SiS_GetModeID_TV(int VGAEngine, unsigned int VBFlags, int HDisplay, int VDisplay, int Depth,
			unsigned int VBFlags2)
{
   unsigned short ModeIndex = 0;

   if(VBFlags2 & VB2_CHRONTEL) {

      switch(HDisplay)
      {
	case 512:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 384) ModeIndex = ModeIndex_512x384[Depth];
	     }
	     break;
	case 640:
	     if(VDisplay == 480)      ModeIndex = ModeIndex_640x480[Depth];
	     else if(VDisplay == 400) ModeIndex = ModeIndex_640x400[Depth];
	     break;
	case 800:
	     if(VDisplay == 600) ModeIndex = ModeIndex_800x600[Depth];
	     break;
	case 1024:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 768) ModeIndex = ModeIndex_1024x768[Depth];
	     }
	     break;
      }

   } else if(VBFlags2 & VB2_SISTVBRIDGE) {

      switch(HDisplay)
      {
	case 320:
	     if(VDisplay == 200)      ModeIndex = ModeIndex_320x200[Depth];
	     else if(VDisplay == 240) ModeIndex = ModeIndex_320x240[Depth];
	     break;
	case 400:
	     if(VDisplay == 300) ModeIndex = ModeIndex_400x300[Depth];
	     break;
	case 512:
	     if( ((VBFlags & TV_YPBPR) && (VBFlags & (TV_YPBPR750P | TV_YPBPR1080I))) ||
		 (VBFlags & TV_HIVISION) 					      ||
		 ((!(VBFlags & (TV_YPBPR | TV_PALM))) && (VBFlags & TV_PAL)) ) {
		if(VDisplay == 384) ModeIndex = ModeIndex_512x384[Depth];
	     }
	     break;
	case 640:
	     if(VDisplay == 480)      ModeIndex = ModeIndex_640x480[Depth];
	     else if(VDisplay == 400) ModeIndex = ModeIndex_640x400[Depth];
	     break;
	case 720:
	     if((!(VBFlags & TV_HIVISION)) && (!((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR1080I)))) {
		if(VDisplay == 480) {
		   ModeIndex = ModeIndex_720x480[Depth];
		} else if(VDisplay == 576) {
		   if( ((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR750P)) ||
		       ((!(VBFlags & (TV_YPBPR | TV_PALM))) && (VBFlags & TV_PAL)) )
		      ModeIndex = ModeIndex_720x576[Depth];
		}
	     }
             break;
	case 768:
	     if((!(VBFlags & TV_HIVISION)) && (!((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR1080I)))) {
		if( ((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR750P)) ||
		    ((!(VBFlags & (TV_YPBPR | TV_PALM))) && (VBFlags & TV_PAL)) ) {
		   if(VDisplay == 576) ModeIndex = ModeIndex_768x576[Depth];
		}
             }
	     break;
	case 800:
	     if(VDisplay == 600) ModeIndex = ModeIndex_800x600[Depth];
	     else if(VDisplay == 480) {
		if(!((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR750P))) {
		   ModeIndex = ModeIndex_800x480[Depth];
		}
	     }
	     break;
	case 960:
	     if(VGAEngine == SIS_315_VGA) {
		if(VDisplay == 600) {
		   if((VBFlags & TV_HIVISION) || ((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR1080I))) {
		      ModeIndex = ModeIndex_960x600[Depth];
		   }
		}
	     }
	     break;
	case 1024:
	     if(VDisplay == 768) {
		if(VBFlags2 & VB2_30xBLV) {
		   ModeIndex = ModeIndex_1024x768[Depth];
		}
	     } else if(VDisplay == 576) {
		if( (VBFlags & TV_HIVISION) ||
		    ((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR1080I)) ||
		    ((VBFlags2 & VB2_30xBLV) &&
		     ((!(VBFlags & (TV_YPBPR | TV_PALM))) && (VBFlags & TV_PAL))) ) {
		   ModeIndex = ModeIndex_1024x576[Depth];
		}
	     }
	     break;
	case 1280:
	     if(VDisplay == 720) {
		if((VBFlags & TV_HIVISION) ||
		   ((VBFlags & TV_YPBPR) && (VBFlags & (TV_YPBPR1080I | TV_YPBPR750P)))) {
		   ModeIndex = ModeIndex_1280x720[Depth];
		}
	     } else if(VDisplay == 1024) {
		if((VBFlags & TV_HIVISION) ||
		   ((VBFlags & TV_YPBPR) && (VBFlags & TV_YPBPR1080I))) {
		   ModeIndex = ModeIndex_1280x1024[Depth];
		}
	     }
	     break;
      }
   }
   return ModeIndex;
}

unsigned short
SiS_GetModeID_VGA2(int VGAEngine, unsigned int VBFlags, int HDisplay, int VDisplay, int Depth,
			unsigned int VBFlags2)
{
   if(!(VBFlags2 & VB2_SISVGA2BRIDGE)) return 0;

   if(HDisplay >= 1920) return 0;

   switch(HDisplay)
   {
	case 1600:
		if(VDisplay == 1200) {
			if(VGAEngine != SIS_315_VGA) return 0;
			if(!(VBFlags2 & VB2_30xB)) return 0;
		}
		break;
	case 1680:
		if(VDisplay == 1050) {
			if(VGAEngine != SIS_315_VGA) return 0;
			if(!(VBFlags2 & VB2_30xB)) return 0;
		}
		break;
   }

   return SiS_GetModeID(VGAEngine, 0, HDisplay, VDisplay, Depth, false, 0, 0);
}


/*********************************************/
/*          HELPER: SetReg, GetReg           */
/*********************************************/

void
SiS_SetReg(SISIOADDRESS port, u8 index, u8 data)
{
	outb(index, port);
	outb(data, port + 1);
}

void
SiS_SetRegByte(SISIOADDRESS port, u8 data)
{
	outb(data, port);
}

void
SiS_SetRegShort(SISIOADDRESS port, u16 data)
{
	outw(data, port);
}

void
SiS_SetRegLong(SISIOADDRESS port, u32 data)
{
	outl(data, port);
}

u8
SiS_GetReg(SISIOADDRESS port, u8 index)
{
	outb(index, port);
	return inb(port + 1);
}

u8
SiS_GetRegByte(SISIOADDRESS port)
{
	return inb(port);
}

u16
SiS_GetRegShort(SISIOADDRESS port)
{
	return inw(port);
}

u32
SiS_GetRegLong(SISIOADDRESS port)
{
	return inl(port);
}

void
SiS_SetRegANDOR(SISIOADDRESS Port, u8 Index, u8 DataAND, u8 DataOR)
{
   u8 temp;

   temp = SiS_GetReg(Port, Index);
   temp = (temp & (DataAND)) | DataOR;
   SiS_SetReg(Port, Index, temp);
}

void
SiS_SetRegAND(SISIOADDRESS Port, u8 Index, u8 DataAND)
{
   u8 temp;

   temp = SiS_GetReg(Port, Index);
   temp &= DataAND;
   SiS_SetReg(Port, Index, temp);
}

void
SiS_SetRegOR(SISIOADDRESS Port, u8 Index, u8 DataOR)
{
   u8 temp;

   temp = SiS_GetReg(Port, Index);
   temp |= DataOR;
   SiS_SetReg(Port, Index, temp);
}

/*********************************************/
/*      HELPER: DisplayOn, DisplayOff        */
/*********************************************/

void
SiS_DisplayOn(struct SiS_Private *SiS_Pr)
{
   SiS_SetRegAND(SiS_Pr->SiS_P3c4,0x01,0xDF);
}

void
SiS_DisplayOff(struct SiS_Private *SiS_Pr)
{
   SiS_SetRegOR(SiS_Pr->SiS_P3c4,0x01,0x20);
}


/*********************************************/
/*        HELPER: Init Port Addresses        */
/*********************************************/

void
SiSRegInit(struct SiS_Private *SiS_Pr, SISIOADDRESS BaseAddr)
{
   SiS_Pr->SiS_P3c4 = BaseAddr + 0x14;
   SiS_Pr->SiS_P3d4 = BaseAddr + 0x24;
   SiS_Pr->SiS_P3c0 = BaseAddr + 0x10;
   SiS_Pr->SiS_P3ce = BaseAddr + 0x1e;
   SiS_Pr->SiS_P3c2 = BaseAddr + 0x12;
   SiS_Pr->SiS_P3ca = BaseAddr + 0x1a;
   SiS_Pr->SiS_P3c6 = BaseAddr + 0x16;
   SiS_Pr->SiS_P3c7 = BaseAddr + 0x17;
   SiS_Pr->SiS_P3c8 = BaseAddr + 0x18;
   SiS_Pr->SiS_P3c9 = BaseAddr + 0x19;
   SiS_Pr->SiS_P3cb = BaseAddr + 0x1b;
   SiS_Pr->SiS_P3cc = BaseAddr + 0x1c;
   SiS_Pr->SiS_P3cd = BaseAddr + 0x1d;
   SiS_Pr->SiS_P3da = BaseAddr + 0x2a;
   SiS_Pr->SiS_Part1Port = BaseAddr + SIS_CRT2_PORT_04;
   SiS_Pr->SiS_Part2Port = BaseAddr + SIS_CRT2_PORT_10;
   SiS_Pr->SiS_Part3Port = BaseAddr + SIS_CRT2_PORT_12;
   SiS_Pr->SiS_Part4Port = BaseAddr + SIS_CRT2_PORT_14;
   SiS_Pr->SiS_Part5Port = BaseAddr + SIS_CRT2_PORT_14 + 2;
   SiS_Pr->SiS_DDC_Port  = BaseAddr + 0x14;
   SiS_Pr->SiS_VidCapt   = BaseAddr + SIS_VIDEO_CAPTURE;
   SiS_Pr->SiS_VidPlay   = BaseAddr + SIS_VIDEO_PLAYBACK;
}

/*********************************************/
/*             HELPER: GetSysFlags           */
/*********************************************/

static void
SiS_GetSysFlags(struct SiS_Private *SiS_Pr)
{
   unsigned char cr5f, temp1, temp2;

   /* 661 and newer: NEVER write non-zero to SR11[7:4] */
   /* (SR11 is used for DDC and in enable/disablebridge) */
   SiS_Pr->SiS_SensibleSR11 = false;
   SiS_Pr->SiS_MyCR63 = 0x63;
   if(SiS_Pr->ChipType >= SIS_330) {
      SiS_Pr->SiS_MyCR63 = 0x53;
      if(SiS_Pr->ChipType >= SIS_661) {
         SiS_Pr->SiS_SensibleSR11 = true;
      }
   }

   /* You should use the macros, not these flags directly */

   SiS_Pr->SiS_SysFlags = 0;
   if(SiS_Pr->ChipType == SIS_650) {
      cr5f = SiS_GetReg(SiS_Pr->SiS_P3d4,0x5f) & 0xf0;
      SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x5c,0x07);
      temp1 = SiS_GetReg(SiS_Pr->SiS_P3d4,0x5c) & 0xf8;
      SiS_SetRegOR(SiS_Pr->SiS_P3d4,0x5c,0xf8);
      temp2 = SiS_GetReg(SiS_Pr->SiS_P3d4,0x5c) & 0xf8;
      if((!temp1) || (temp2)) {
	 switch(cr5f) {
	    case 0x80:
	    case 0x90:
	    case 0xc0:
	       SiS_Pr->SiS_SysFlags |= SF_IsM650;
	       break;
	    case 0xa0:
	    case 0xb0:
	    case 0xe0:
	       SiS_Pr->SiS_SysFlags |= SF_Is651;
	       break;
	 }
      } else {
	 switch(cr5f) {
	    case 0x90:
	       temp1 = SiS_GetReg(SiS_Pr->SiS_P3d4,0x5c) & 0xf8;
	       switch(temp1) {
		  case 0x00: SiS_Pr->SiS_SysFlags |= SF_IsM652; break;
		  case 0x40: SiS_Pr->SiS_SysFlags |= SF_IsM653; break;
		  default:   SiS_Pr->SiS_SysFlags |= SF_IsM650; break;
	       }
	       break;
	    case 0xb0:
	       SiS_Pr->SiS_SysFlags |= SF_Is652;
	       break;
	    default:
	       SiS_Pr->SiS_SysFlags |= SF_IsM650;
	       break;
	 }
      }
   }

   if(SiS_Pr->ChipType >= SIS_760 && SiS_Pr->ChipType <= SIS_761) {
      if(SiS_GetReg(SiS_Pr->SiS_P3d4,0x78) & 0x30) {
         SiS_Pr->SiS_SysFlags |= SF_760LFB;
      }
      if(SiS_GetReg(SiS_Pr->SiS_P3d4,0x79) & 0xf0) {
         SiS_Pr->SiS_SysFlags |= SF_760UMA;
      }
   }
}

/*********************************************/
/*         HELPER: Init PCI & Engines        */
/*********************************************/

static void
SiSInitPCIetc(struct SiS_Private *SiS_Pr)
{
   switch(SiS_Pr->ChipType) {
#ifdef CONFIG_FB_SIS_300
   case SIS_300:
   case SIS_540:
   case SIS_630:
   case SIS_730:
      /* Set - PCI LINEAR ADDRESSING ENABLE (0x80)
       *     - RELOCATED VGA IO ENABLED (0x20)
       *     - MMIO ENABLED (0x01)
       * Leave other bits untouched.
       */
      SiS_SetRegOR(SiS_Pr->SiS_P3c4,0x20,0xa1);
      /*  - Enable 2D (0x40)
       *  - Enable 3D (0x02)
       *  - Enable 3D Vertex command fetch (0x10) ?
       *  - Enable 3D command parser (0x08) ?
       */
      SiS_SetRegOR(SiS_Pr->SiS_P3c4,0x1E,0x5A);
      break;
#endif
#ifdef CONFIG_FB_SIS_315
   case SIS_315H:
   case SIS_315:
   case SIS_315PRO:
   case SIS_650:
   case SIS_740:
   case SIS_330:
   case SIS_661:
   case SIS_741:
   case SIS_660:
   case SIS_760:
   case SIS_761:
   case SIS_340:
   case XGI_40:
      /* See above */
      SiS_SetRegOR(SiS_Pr->SiS_P3c4,0x20,0xa1);
      /*  - Enable 3D G/L transformation engine (0x80)
       *  - Enable 2D (0x40)
       *  - Enable 3D vertex command fetch (0x10)
       *  - Enable 3D command parser (0x08)
       *  - Enable 3D (0x02)
       */
      SiS_SetRegOR(SiS_Pr->SiS_P3c4,0x1E,0xDA);
      break;
   case XGI_20:
   case SIS_550:
      /* See above */
      SiS_SetRegOR(SiS_Pr->SiS_P3c4,0x20,0xa1);
      /* No 3D engine ! */
      /*  - Enable 2D (0x40)
       *  - disable 3D
       */
      SiS_SetRegANDOR(SiS_Pr->SiS_P3c4,0x1E,0x60,0x40);
      break;
#endif
   default:
      break;
   }
}

/*********************************************/
/*             HELPER: SetLVDSetc            */
/*********************************************/

static
void
SiSSetLVDSetc(struct SiS_Private *SiS_Pr)
{
   unsigned short temp;

   SiS_Pr->SiS_IF_DEF_LVDS = 0;
   SiS_Pr->SiS_IF_DEF_TRUMPION = 0;
   SiS_Pr->SiS_IF_DEF_CH70xx = 0;
   SiS_Pr->SiS_IF_DEF_CONEX = 0;

   SiS_Pr->SiS_ChrontelInit = 0;

   if(SiS_Pr->ChipType == XGI_20) return;

   /* Check for SiS30x first */
   temp = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x00);
   if((temp == 1) || (temp == 2)) return;

   switch(SiS_Pr->ChipType) {
#ifdef CONFIG_FB_SIS_300
   case SIS_540:
   case SIS_630:
   case SIS_730:
	temp = (SiS_GetReg(SiS_Pr->SiS_P3d4,0x37) & 0x0e) >> 1;
	if((temp >= 2) && (temp <= 5))	SiS_Pr->SiS_IF_DEF_LVDS = 1;
	if(temp == 3)			SiS_Pr->SiS_IF_DEF_TRUMPION = 1;
	if((temp == 4) || (temp == 5)) {
		/* Save power status (and error check) - UNUSED */
		SiS_Pr->SiS_Backup70xx = SiS_GetCH700x(SiS_Pr, 0x0e);
		SiS_Pr->SiS_IF_DEF_CH70xx = 1;
	}
	break;
#endif
#ifdef CONFIG_FB_SIS_315
   case SIS_550:
   case SIS_650:
   case SIS_740:
   case SIS_330:
	temp = (SiS_GetReg(SiS_Pr->SiS_P3d4,0x37) & 0x0e) >> 1;
	if((temp >= 2) && (temp <= 3))	SiS_Pr->SiS_IF_DEF_LVDS = 1;
	if(temp == 3)			SiS_Pr->SiS_IF_DEF_CH70xx = 2;
	break;
   case SIS_661:
   case SIS_741:
   case SIS_660:
   case SIS_760:
   case SIS_761:
   case SIS_340:
   case XGI_20:
   case XGI_40:
	temp = (SiS_GetReg(SiS_Pr->SiS_P3d4,0x38) & 0xe0) >> 5;
	if((temp >= 2) && (temp <= 3)) 	SiS_Pr->SiS_IF_DEF_LVDS = 1;
	if(temp == 3)			SiS_Pr->SiS_IF_DEF_CH70xx = 2;
	if(temp == 4)			SiS_Pr->SiS_IF_DEF_CONEX = 1;  /* Not yet supported */
	break;
#endif
   default:
	break;
   }
}

/*********************************************/
/*          HELPER: Enable DSTN/FSTN         */
/*********************************************/

void
SiS_SetEnableDstn(struct SiS_Private *SiS_Pr, int enable)
{
   SiS_Pr->SiS_IF_DEF_DSTN = enable ? 1 : 0;
}

void
SiS_SetEnableFstn(struct SiS_Private *SiS_Pr, int enable)
{
   SiS_Pr->SiS_IF_DEF_FSTN = enable ? 1 : 0;
}

/*********************************************/
/*            HELPER: Get modeflag           */
/*********************************************/

unsigned short
SiS_GetModeFlag(struct SiS_Private *SiS_Pr, unsigned short ModeNo,
		unsigned short ModeIdIndex)
{
   if(SiS_Pr->UseCustomMode) {
      return SiS_Pr->CModeFlag;
   } else if(ModeNo <= 0x13) {
      return SiS_Pr->SiS_SModeIDTable[ModeIdIndex].St_ModeFlag;
   } else {
      return SiS_Pr->SiS_EModeIDTable[ModeIdIndex].Ext_ModeFlag;
   }
}

/*********************************************/
/*        HELPER: Determine ROM usage        */
/*********************************************/

bool
SiSDetermineROMLayout661(struct SiS_Private *SiS_Pr)
{
   unsigned char  *ROMAddr  = SiS_Pr->VirtualRomBase;
   unsigned short romversoffs, romvmaj = 1, romvmin = 0;

   if(SiS_Pr->ChipType >= XGI_20) {
      /* XGI ROMs don't qualify */
      return false;
   } else if(SiS_Pr->ChipType >= SIS_761) {
      /* I very much assume 761, 340 and newer will use new layout */
      return true;
   } else if(SiS_Pr->ChipType >= SIS_661) {
      if((ROMAddr[0x1a] == 'N') &&
	 (ROMAddr[0x1b] == 'e') &&
	 (ROMAddr[0x1c] == 'w') &&
	 (ROMAddr[0x1d] == 'V')) {
	 return true;
      }
      romversoffs = ROMAddr[0x16] | (ROMAddr[0x17] << 8);
      if(romversoffs) {
	 if((ROMAddr[romversoffs+1] == '.') || (ROMAddr[romversoffs+4] == '.')) {
	    romvmaj = ROMAddr[romversoffs] - '0';
	    romvmin = ((ROMAddr[romversoffs+2] -'0') * 10) + (ROMAddr[romversoffs+3] - '0');
	 }
      }
      if((romvmaj != 0) || (romvmin >= 92)) {
	 return true;
      }
   } else if(IS_SIS650740) {
      if((ROMAddr[0x1a] == 'N') &&
	 (ROMAddr[0x1b] == 'e') &&
	 (ROMAddr[0x1c] == 'w') &&
	 (ROMAddr[0x1d] == 'V')) {
	 return true;
      }
   }
   return false;
}

static void
SiSDetermineROMUsage(struct SiS_Private *SiS_Pr)
{
   unsigned char  *ROMAddr  = SiS_Pr->VirtualRomBase;
   unsigned short romptr = 0;

   SiS_Pr->SiS_UseROM = false;
   SiS_Pr->SiS_ROMNew = false;
   SiS_Pr->SiS_PWDOffset = 0;

   if(SiS_Pr->ChipType >= XGI_20) return;

   if((ROMAddr) && (SiS_Pr->UseROM)) {
      if(SiS_Pr->ChipType == SIS_300) {
	 /* 300: We check if the code starts below 0x220 by
	  * checking the jmp instruction at the beginning
	  * of the BIOS image.
	  */
	 if((ROMAddr[3] == 0xe9) && ((ROMAddr[5] << 8) | ROMAddr[4]) > 0x21a)
	    SiS_Pr->SiS_UseROM = true;
      } else if(SiS_Pr->ChipType < SIS_315H) {
	 /* Sony's VAIO BIOS 1.09 follows the standard, so perhaps
	  * the others do as well
	  */
	 SiS_Pr->SiS_UseROM = true;
      } else {
	 /* 315/330 series stick to the standard(s) */
	 SiS_Pr->SiS_UseROM = true;
	 if((SiS_Pr->SiS_ROMNew = SiSDetermineROMLayout661(SiS_Pr))) {
	    SiS_Pr->SiS_EMIOffset = 14;
	    SiS_Pr->SiS_PWDOffset = 17;
	    SiS_Pr->SiS661LCD2TableSize = 36;
	    /* Find out about LCD data table entry size */
	    if((romptr = SISGETROMW(0x0102))) {
	       if(ROMAddr[romptr + (32 * 16)] == 0xff)
		  SiS_Pr->SiS661LCD2TableSize = 32;
	       else if(ROMAddr[romptr + (34 * 16)] == 0xff)
		  SiS_Pr->SiS661LCD2TableSize = 34;
	       else if(ROMAddr[romptr + (36 * 16)] == 0xff)	   /* 0.94, 2.05.00+ */
		  SiS_Pr->SiS661LCD2TableSize = 36;
	       else if( (ROMAddr[romptr + (38 * 16)] == 0xff) ||   /* 2.00.00 - 2.02.00 */
		 	(ROMAddr[0x6F] & 0x01) ) {		   /* 2.03.00 - <2.05.00 */
		  SiS_Pr->SiS661LCD2TableSize = 38;		   /* UMC data layout abandoned at 2.05.00 */
		  SiS_Pr->SiS_EMIOffset = 16;
		  SiS_Pr->SiS_PWDOffset = 19;
	       }
	    }
	 }
      }
   }
}

/*********************************************/
/*        HELPER: SET SEGMENT REGISTERS      */
/*********************************************/

static void
SiS_SetSegRegLower(struct SiS_Private *SiS_Pr, unsigned short value)
{
   unsigned short temp;

   value &= 0x00ff;
   temp = SiS_GetRegByte(SiS_Pr->SiS_P3cb) & 0xf0;
   temp |= (value >> 4);
   SiS_SetRegByte(SiS_Pr->SiS_P3cb, temp);
   temp = SiS_GetRegByte(SiS_Pr->SiS_P3cd) & 0xf0;
   temp |= (value & 0x0f);
   SiS_SetRegByte(SiS_Pr->SiS_P3cd, temp);
}

static void
SiS_SetSegRegUpper(struct SiS_Private *SiS_Pr, unsigned short value)
{
   unsigned short temp;

   value &= 0x00ff;
   temp = SiS_GetRegByte(SiS_Pr->SiS_P3cb) & 0x0f;
   temp |= (value & 0xf0);
   SiS_SetRegByte(SiS_Pr->SiS_P3cb, temp);
   temp = SiS_GetRegByte(SiS_Pr->SiS_P3cd) & 0x0f;
   temp |= (value << 4);
   SiS_SetRegByte(SiS_Pr->SiS_P3cd, temp);
}

static void
SiS_SetSegmentReg(struct SiS_Private *SiS_Pr, unsigned short value)
{
   SiS_SetSegRegLower(SiS_Pr, value);
   SiS_SetSegRegUpper(SiS_Pr, value);
}

static void
SiS_ResetSegmentReg(struct SiS_Private *SiS_Pr)
{
   SiS_SetSegmentReg(SiS_Pr, 0);
}

static void
SiS_SetSegmentRegOver(struct SiS_Private *SiS_Pr, unsigned short value)
{
   unsigned short temp = value >> 8;

   temp &= 0x07;
   temp |= (temp << 4);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x1d,temp);
   SiS_SetSegmentReg(SiS_Pr, value);
}

static void
SiS_ResetSegmentRegOver(struct SiS_Private *SiS_Pr)
{
   SiS_SetSegmentRegOver(SiS_Pr, 0);
}

static void
SiS_ResetSegmentRegisters(struct SiS_Private *SiS_Pr)
{
   if((IS_SIS65x) || (SiS_Pr->ChipType >= SIS_661)) {
      SiS_ResetSegmentReg(SiS_Pr);
      SiS_ResetSegmentRegOver(SiS_Pr);
   }
}

/*********************************************/
/*             HELPER: GetVBType             */
/*********************************************/

static
void
SiS_GetVBType(struct SiS_Private *SiS_Pr)
{
   unsigned short flag = 0, rev = 0, nolcd = 0;
   unsigned short p4_0f, p4_25, p4_27;

   SiS_Pr->SiS_VBType = 0;

   if((SiS_Pr->SiS_IF_DEF_LVDS) || (SiS_Pr->SiS_IF_DEF_CONEX))
      return;

   if(SiS_Pr->ChipType == XGI_20)
      return;

   flag = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x00);

   if(flag > 3)
      return;

   rev = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x01);

   if(flag >= 2) {
      SiS_Pr->SiS_VBType = VB_SIS302B;
   } else if(flag == 1) {
      if(rev >= 0xC0) {
	 SiS_Pr->SiS_VBType = VB_SIS301C;
      } else if(rev >= 0xB0) {
	 SiS_Pr->SiS_VBType = VB_SIS301B;
	 /* Check if 30xB DH version (no LCD support, use Panel Link instead) */
	 nolcd = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x23);
	 if(!(nolcd & 0x02)) SiS_Pr->SiS_VBType |= VB_NoLCD;
      } else {
	 SiS_Pr->SiS_VBType = VB_SIS301;
      }
   }
   if(SiS_Pr->SiS_VBType & (VB_SIS301B | VB_SIS301C | VB_SIS302B)) {
      if(rev >= 0xE0) {
	 flag = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x39);
	 if(flag == 0xff) SiS_Pr->SiS_VBType = VB_SIS302LV;
	 else 	 	  SiS_Pr->SiS_VBType = VB_SIS301C;  /* VB_SIS302ELV; */
      } else if(rev >= 0xD0) {
	 SiS_Pr->SiS_VBType = VB_SIS301LV;
      }
   }
   if(SiS_Pr->SiS_VBType & (VB_SIS301C | VB_SIS301LV | VB_SIS302LV | VB_SIS302ELV)) {
      p4_0f = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x0f);
      p4_25 = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x25);
      p4_27 = SiS_GetReg(SiS_Pr->SiS_Part4Port,0x27);
      SiS_SetRegAND(SiS_Pr->SiS_Part4Port,0x0f,0x7f);
      SiS_SetRegOR(SiS_Pr->SiS_Part4Port,0x25,0x08);
      SiS_SetRegAND(SiS_Pr->SiS_Part4Port,0x27,0xfd);
      if(SiS_GetReg(SiS_Pr->SiS_Part4Port,0x26) & 0x08) {
         SiS_Pr->SiS_VBType |= VB_UMC;
      }
      SiS_SetReg(SiS_Pr->SiS_Part4Port,0x27,p4_27);
      SiS_SetReg(SiS_Pr->SiS_Part4Port,0x25,p4_25);
      SiS_SetReg(SiS_Pr->SiS_Part4Port,0x0f,p4_0f);
   }
}

/*********************************************/
/*           HELPER: Check RAM size          */
/*********************************************/

static bool
SiS_CheckMemorySize(struct SiS_Private *SiS_Pr, unsigned short ModeNo,
		unsigned short ModeIdIndex)
{
   unsigned short AdapterMemSize = SiS_Pr->VideoMemorySize / (1024*1024);
   unsigned short modeflag = SiS_GetModeFlag(SiS_Pr, ModeNo, ModeIdIndex);
   unsigned short memorysize = ((modeflag & MemoryInfoFlag) >> MemorySizeShift) + 1;

   if(!AdapterMemSize) return true;

   if(AdapterMemSize < memorysize) return false;
   return true;
}

/*********************************************/
/*           HELPER: Get DRAM type           */
/*********************************************/

#ifdef CONFIG_FB_SIS_315
static unsigned char
SiS_Get310DRAMType(struct SiS_Private *SiS_Pr)
{
   unsigned char data;

   if((*SiS_Pr->pSiS_SoftSetting) & SoftDRAMType) {
      data = (*SiS_Pr->pSiS_SoftSetting) & 0x03;
   } else {
      if(SiS_Pr->ChipType >= XGI_20) {
         /* Do I need this? SR17 seems to be zero anyway... */
	 data = 0;
      } else if(SiS_Pr->ChipType >= SIS_340) {
	 /* TODO */
	 data = 0;
      } else if(SiS_Pr->ChipType >= SIS_661) {
	 if(SiS_Pr->SiS_ROMNew) {
	    data = ((SiS_GetReg(SiS_Pr->SiS_P3d4,0x78) & 0xc0) >> 6);
	 } else {
	    data = SiS_GetReg(SiS_Pr->SiS_P3d4,0x78) & 0x07;
	 }
      } else if(IS_SIS550650740) {
	 data = SiS_GetReg(SiS_Pr->SiS_P3c4,0x13) & 0x07;
      } else {	/* 315, 330 */
	 data = SiS_GetReg(SiS_Pr->SiS_P3c4,0x3a) & 0x03;
	 if(SiS_Pr->ChipType == SIS_330) {
	    if(data > 1) {
	       switch(SiS_GetReg(SiS_Pr->SiS_P3d4,0x5f) & 0x30) {
	       case 0x00: data = 1; break;
	       case 0x10: data = 3; break;
	       case 0x20: data = 3; break;
	       case 0x30: data = 2; break;
	       }
	    } else {
	       data = 0;
	    }
	 }
      }
   }

   return data;
}

static unsigned short
SiS_GetMCLK(struct SiS_Private *SiS_Pr)
{
   unsigned char  *ROMAddr = SiS_Pr->VirtualRomBase;
   unsigned short index;

   index = SiS_Get310DRAMType(SiS_Pr);
   if(SiS_Pr->ChipType >= SIS_661) {
      if(SiS_Pr->SiS_ROMNew) {
	 return((unsigned short)(SISGETROMW((0x90 + (index * 5) + 3))));
      }
      return(SiS_Pr->SiS_MCLKData_0[index].CLOCK);
   } else if(index >= 4) {
      return(SiS_Pr->SiS_MCLKData_1[index - 4].CLOCK);
   } else {
      return(SiS_Pr->SiS_MCLKData_0[index].CLOCK);
   }
}
#endif

/*********************************************/
/*           HELPER: ClearBuffer             */
/*********************************************/

static void
SiS_ClearBuffer(struct SiS_Private *SiS_Pr, unsigned short ModeNo)
{
   unsigned char  SISIOMEMTYPE *memaddr = SiS_Pr->VideoMemoryAddress;
   unsigned int   memsize = SiS_Pr->VideoMemorySize;
   unsigned short SISIOMEMTYPE *pBuffer;
   int i;

   if(!memaddr || !memsize) return;

   if(SiS_Pr->SiS_ModeType >= ModeEGA) {
      if(ModeNo > 0x13) {
	 memset_io(memaddr, 0, memsize);
      } else {
	 pBuffer = (unsigned short SISIOMEMTYPE *)memaddr;
	 for(i = 0; i < 0x4000; i++) writew(0x0000, &pBuffer[i]);
      }
   } else if(SiS_Pr->SiS_ModeType < ModeCGA) {
      pBuffer = (unsigned short SISIOMEMTYPE *)memaddr;
      for(i = 0; i < 0x4000; i++) writew(0x0720, &pBuffer[i]);
   } else {
      memset_io(memaddr, 0, 0x8000);
   }
}

/*********************************************/
/*           HELPER: SearchModeID            */
/*********************************************/

bool
SiS_SearchModeID(struct SiS_Private *SiS_Pr, unsigned short *ModeNo,
		unsigned short *ModeIdIndex)
{
   unsigned char VGAINFO = SiS_Pr->SiS_VGAINFO;

   if((*ModeNo) <= 0x13) {

      if((*ModeNo) <= 0x05) (*ModeNo) |= 0x01;

      for((*ModeIdIndex) = 0; ;(*ModeIdIndex)++) {
	 if(SiS_Pr->SiS_SModeIDTable[(*ModeIdIndex)].St_ModeID == (*ModeNo)) break;
	 if(SiS_Pr->SiS_SModeIDTable[(*ModeIdIndex)].St_ModeID == 0xFF) return false;
      }

      if((*ModeNo) == 0x07) {
	  if(VGAINFO & 0x10) (*ModeIdIndex)++;   /* 400 lines */
	  /* else 350 lines */
      }
      if((*ModeNo) <= 0x03) {
	 if(!(VGAINFO & 0x80)) (*ModeIdIndex)++;
	 if(VGAINFO & 0x10)    (*ModeIdIndex)++; /* 400 lines  */
	 /* else 350 lines  */
      }
      /* else 200 lines  */

   } else {

      for((*ModeIdIndex) = 0; ;(*ModeIdIndex)++) {
	 if(SiS_Pr->SiS_EModeIDTable[(*ModeIdIndex)].Ext_ModeID == (*ModeNo)) break;
	 if(SiS_Pr->SiS_EModeIDTable[(*ModeIdIndex)].Ext_ModeID == 0xFF) return false;
      }

   }
   return true;
}

/*********************************************/
/*            HELPER: GetModePtr             */
/*********************************************/

unsigned short
SiS_GetModePtr(struct SiS_Private *SiS_Pr, unsigned short ModeNo, unsigned short ModeIdIndex)
{
   unsigned short index;

   if(ModeNo <= 0x13) {
      index = SiS_Pr->SiS_SModeIDTable[ModeIdIndex].St_StTableIndex;
   } else {
      if(SiS_Pr->SiS_ModeType <= ModeEGA) index = 0x1B;
      else index = 0x0F;
   }
   return index;
}

/*********************************************/
/*         HELPERS: Get some indices         */
/*********************************************/

unsigned short
SiS_GetRefCRTVCLK(struct SiS_Private *SiS_Pr, unsigned short Index, int UseWide)
{
   if(SiS_Pr->SiS_RefIndex[Index].Ext_InfoFlag & HaveWideTiming) {
      if(UseWide == 1) {
         return SiS_Pr->SiS_RefIndex[Index].Ext_CRTVCLK_WIDE;
      } else {
         return SiS_Pr->SiS_RefIndex[Index].Ext_CRTVCLK_NORM;
      }
   } else {
      return SiS_Pr->SiS_RefIndex[Index].Ext_CRTVCLK;
   }
}

unsigned short
SiS_GetRefCRT1CRTC(struct SiS_Private *SiS_Pr, unsigned short Index, int UseWide)
{
   if(SiS_Pr->SiS_RefIndex[Index].Ext_InfoFlag & HaveWideTiming) {
      if(UseWide == 1) {
         return SiS_Pr->SiS_RefIndex[Index].Ext_CRT1CRTC_WIDE;
      } else {
         return SiS_Pr->SiS_RefIndex[Index].Ext_CRT1CRTC_NORM;
      }
   } else {
      return SiS_Pr->SiS_RefIndex[Index].Ext_CRT1CRTC;
   }
}

/*********************************************/
/*           HELPER: LowModeTests            */
/*********************************************/

static bool
SiS_DoLowModeTest(struct SiS_Private *SiS_Pr, unsigned short ModeNo)
{
   unsigned short temp, temp1, temp2;

   if((ModeNo != 0x03) && (ModeNo != 0x10) && (ModeNo != 0x12))
      return true;
   temp = SiS_GetReg(SiS_Pr->SiS_P3d4,0x11);
   SiS_SetRegOR(SiS_Pr->SiS_P3d4,0x11,0x80);
   temp1 = SiS_GetReg(SiS_Pr->SiS_P3d4,0x00);
   SiS_SetReg(SiS_Pr->SiS_P3d4,0x00,0x55);
   temp2 = SiS_GetReg(SiS_Pr->SiS_P3d4,0x00);
   SiS_SetReg(SiS_Pr->SiS_P3d4,0x00,temp1);
   SiS_SetReg(SiS_Pr->SiS_P3d4,0x11,temp);
   if((SiS_Pr->ChipType >= SIS_315H) ||
      (SiS_Pr->ChipType == SIS_300)) {
      if(temp2 == 0x55) return false;
      else return true;
   } else {
      if(temp2 != 0x55) return true;
      else {
	 SiS_SetRegOR(SiS_Pr->SiS_P3d4,0x35,0x01);
	 return false;
      }
   }
}

static void
SiS_SetLowModeTest(struct SiS_Private *SiS_Pr, unsigned short ModeNo)
{
   if(SiS_DoLowModeTest(SiS_Pr, ModeNo)) {
      SiS_Pr->SiS_SetFlag |= LowModeTests;
   }
}

/*********************************************/
/*        HELPER: OPEN/CLOSE CRT1 CRTC       */
/*********************************************/

static void
SiS_OpenCRTC(struct SiS_Private *SiS_Pr)
{
   if(IS_SIS650) {
      SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x51,0x1f);
      if(IS_SIS651) SiS_SetRegOR(SiS_Pr->SiS_P3d4,0x51,0x20);
      SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x56,0xe7);
   } else if(IS_SIS661741660760) {
      SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x61,0xf7);
      SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x51,0x1f);
      SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x56,0xe7);
      if(!SiS_Pr->SiS_ROMNew) {
	 SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x3a,0xef);
      }
   }
}

static void
SiS_CloseCRTC(struct SiS_Private *SiS_Pr)
{
#if 0 /* This locks some CRTC registers. We don't want that. */
   unsigned short temp1 = 0, temp2 = 0;

   if(IS_SIS661741660760) {
      if(SiS_Pr->SiS_VBInfo & SetCRT2ToLCDA) {
         temp1 = 0xa0; temp2 = 0x08;
      }
      SiS_SetRegANDOR(SiS_Pr->SiS_P3d4,0x51,0x1f,temp1);
      SiS_SetRegANDOR(SiS_Pr->SiS_P3d4,0x56,0xe7,temp2);
   }
#endif
}

static void
SiS_HandleCRT1(struct SiS_Private *SiS_Pr)
{
   /* Enable CRT1 gating */
   SiS_SetRegAND(SiS_Pr->SiS_P3d4,SiS_Pr->SiS_MyCR63,0xbf);
#if 0
   if(!(SiS_GetReg(SiS_Pr->SiS_P3c4,0x15) & 0x01)) {
      if((SiS_GetReg(SiS_Pr->SiS_P3c4,0x15) & 0x0a) ||
         (SiS_GetReg(SiS_Pr->SiS_P3c4,0x16) & 0x01)) {
         SiS_SetRegOR(SiS_Pr->SiS_P3d4,SiS_Pr->SiS_MyCR63,0x40);
      }
   }
#endif
}

/*********************************************/
/*           HELPER: GetColorDepth           */
/*********************************************/

unsigned short
SiS_GetColorDepth(struct SiS_Private *SiS_Pr, unsigned short ModeNo,
		unsigned short ModeIdIndex)
{
   static const unsigned short ColorDepth[6] = { 1, 2, 4, 4, 6, 8 };
   unsigned short modeflag;
   short index;

   /* Do NOT check UseCustomMode, will skrew up FIFO */
   if(ModeNo == 0xfe) {
      modeflag = SiS_Pr->CModeFlag;
   } else if(ModeNo <= 0x13) {
      modeflag = SiS_Pr->SiS_SModeIDTable[ModeIdIndex].St_ModeFlag;
   } else {
      modeflag = SiS_Pr->SiS_EModeIDTable[ModeIdIndex].Ext_ModeFlag;
   }

   index = (modeflag & ModeTypeMask) - ModeEGA;
   if(index < 0) index = 0;
   return ColorDepth[index];
}

/*********************************************/
/*             HELPER: GetOffset             */
/*********************************************/

unsigned short
SiS_GetOffset(struct SiS_Private *SiS_Pr, unsigned short ModeNo,
		unsigned short ModeIdIndex, unsigned short RRTI)
{
   unsigned short xres, temp, colordepth, infoflag;

   if(SiS_Pr->UseCustomMode) {
      infoflag = SiS_Pr->CInfoFlag;
      xres = SiS_Pr->CHDisplay;
   } else {
      infoflag = SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag;
      xres = SiS_Pr->SiS_RefIndex[RRTI].XRes;
   }

   colordepth = SiS_GetColorDepth(SiS_Pr, ModeNo, ModeIdIndex);

   temp = xres / 16;
   if(infoflag & InterlaceMode) temp <<= 1;
   temp *= colordepth;
   if(xres % 16) temp += (colordepth >> 1);

   return temp;
}

/*********************************************/
/*                   SEQ                     */
/*********************************************/

static void
SiS_SetSeqRegs(struct SiS_Private *SiS_Pr, unsigned short StandTableIndex)
{
   unsigned char SRdata;
   int i;

   SiS_SetReg(SiS_Pr->SiS_P3c4,0x00,0x03);

   /* or "display off"  */
   SRdata = SiS_Pr->SiS_StandTable[StandTableIndex].SR[0] | 0x20;

   /* determine whether to force x8 dotclock */
   if((SiS_Pr->SiS_VBType & VB_SISVB) || (SiS_Pr->SiS_IF_DEF_LVDS)) {

      if(SiS_Pr->SiS_VBInfo & (SetCRT2ToLCD | SetCRT2ToTV)) {
         if(SiS_Pr->SiS_VBInfo & SetInSlaveMode)    SRdata |= 0x01;
      } else if(SiS_Pr->SiS_VBInfo & SetCRT2ToLCDA) SRdata |= 0x01;

   }

   SiS_SetReg(SiS_Pr->SiS_P3c4,0x01,SRdata);

   for(i = 2; i <= 4; i++) {
      SRdata = SiS_Pr->SiS_StandTable[StandTableIndex].SR[i - 1];
      SiS_SetReg(SiS_Pr->SiS_P3c4,i,SRdata);
   }
}

/*********************************************/
/*                  MISC                     */
/*********************************************/

static void
SiS_SetMiscRegs(struct SiS_Private *SiS_Pr, unsigned short StandTableIndex)
{
   unsigned char Miscdata;

   Miscdata = SiS_Pr->SiS_StandTable[StandTableIndex].MISC;

   if(SiS_Pr->ChipType < SIS_661) {
      if(SiS_Pr->SiS_VBType & VB_SIS30xBLV) {
	 if(SiS_Pr->SiS_VBInfo & SetCRT2ToLCDA) {
	   Miscdata |= 0x0C;
	 }
      }
   }

   SiS_SetRegByte(SiS_Pr->SiS_P3c2,Miscdata);
}

/*********************************************/
/*                  CRTC                     */
/*********************************************/

static void
SiS_SetCRTCRegs(struct SiS_Private *SiS_Pr, unsigned short StandTableIndex)
{
   unsigned char  CRTCdata;
   unsigned short i;

   /* Unlock CRTC */
   SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x11,0x7f);

   for(i = 0; i <= 0x18; i++) {
      CRTCdata = SiS_Pr->SiS_StandTable[StandTableIndex].CRTC[i];
      SiS_SetReg(SiS_Pr->SiS_P3d4,i,CRTCdata);
   }

   if(SiS_Pr->ChipType >= SIS_661) {
      SiS_OpenCRTC(SiS_Pr);
      for(i = 0x13; i <= 0x14; i++) {
	 CRTCdata = SiS_Pr->SiS_StandTable[StandTableIndex].CRTC[i];
	 SiS_SetReg(SiS_Pr->SiS_P3d4,i,CRTCdata);
      }
   } else if( ( (SiS_Pr->ChipType == SIS_630) ||
	        (SiS_Pr->ChipType == SIS_730) )  &&
	      (SiS_Pr->ChipRevision >= 0x30) ) {
      if(SiS_Pr->SiS_VBInfo & SetInSlaveMode) {
	 if(SiS_Pr->SiS_VBInfo & (SetCRT2ToLCD | SetCRT2ToTV)) {
	    SiS_SetReg(SiS_Pr->SiS_P3d4,0x18,0xFE);
	 }
      }
   }
}

/*********************************************/
/*                   ATT                     */
/*********************************************/

static void
SiS_SetATTRegs(struct SiS_Private *SiS_Pr, unsigned short StandTableIndex)
{
   unsigned char  ARdata;
   unsigned short i;

   for(i = 0; i <= 0x13; i++) {
      ARdata = SiS_Pr->SiS_StandTable[StandTableIndex].ATTR[i];

      if(i == 0x13) {
	 /* Pixel shift. If screen on LCD or TV is shifted left or right,
	  * this might be the cause.
	  */
	 if(SiS_Pr->SiS_VBType & VB_SIS30xBLV) {
	    if(SiS_Pr->SiS_VBInfo & SetCRT2ToLCDA) ARdata = 0;
	 }
	 if(SiS_Pr->SiS_IF_DEF_LVDS == 1) {
	    if(SiS_Pr->SiS_IF_DEF_CH70xx != 0) {
	       if(SiS_Pr->SiS_VBInfo & SetCRT2ToTV) {
		  if(SiS_Pr->SiS_VBInfo & SetInSlaveMode) ARdata = 0;
	       }
	    }
	 }
	 if(SiS_Pr->ChipType >= SIS_661) {
	    if(SiS_Pr->SiS_VBInfo & (SetCRT2ToTV | SetCRT2ToLCD)) {
	       if(SiS_Pr->SiS_VBInfo & SetInSlaveMode) ARdata = 0;
	    }
	 } else if(SiS_Pr->SiS_VBInfo & SetCRT2ToLCD) {
	    if(SiS_Pr->ChipType >= SIS_315H) {
	       if(IS_SIS550650740660) {
		  /* 315, 330 don't do this */
		  if(SiS_Pr->SiS_VBType & VB_SIS30xB) {
		     if(SiS_Pr->SiS_VBInfo & SetInSlaveMode) ARdata = 0;
		  } else {
		     ARdata = 0;
		  }
	       }
	    } else {
	       if(SiS_Pr->SiS_VBInfo & SetInSlaveMode) ARdata = 0;
	    }
	 }
      }
      SiS_GetRegByte(SiS_Pr->SiS_P3da);		/* reset 3da  */
      SiS_SetRegByte(SiS_Pr->SiS_P3c0,i);	/* set index  */
      SiS_SetRegByte(SiS_Pr->SiS_P3c0,ARdata);	/* set data   */
   }

   SiS_GetRegByte(SiS_Pr->SiS_P3da);		/* reset 3da  */
   SiS_SetRegByte(SiS_Pr->SiS_P3c0,0x14);	/* set index  */
   SiS_SetRegByte(SiS_Pr->SiS_P3c0,0x00);	/* set data   */

   SiS_GetRegByte(SiS_Pr->SiS_P3da);
   SiS_SetRegByte(SiS_Pr->SiS_P3c0,0x20);	/* Enable Attribute  */
   SiS_GetRegByte(SiS_Pr->SiS_P3da);
}

/*********************************************/
/*                   GRC                     */
/*********************************************/

static void
SiS_SetGRCRegs(struct SiS_Private *SiS_Pr, unsigned short StandTableIndex)
{
   unsigned char  GRdata;
   unsigned short i;

   for(i = 0; i <= 0x08; i++) {
      GRdata = SiS_Pr->SiS_StandTable[StandTableIndex].GRC[i];
      SiS_SetReg(SiS_Pr->SiS_P3ce,i,GRdata);
   }

   if(SiS_Pr->SiS_ModeType > ModeVGA) {
      /* 256 color disable */
      SiS_SetRegAND(SiS_Pr->SiS_P3ce,0x05,0xBF);
   }
}

/*********************************************/
/*          CLEAR EXTENDED REGISTERS         */
/*********************************************/

static void
SiS_ClearExt1Regs(struct SiS_Private *SiS_Pr, unsigned short ModeNo)
{
   unsigned short i;

   for(i = 0x0A; i <= 0x0E; i++) {
      SiS_SetReg(SiS_Pr->SiS_P3c4,i,0x00);
   }

   if(SiS_Pr->ChipType >= SIS_315H) {
      SiS_SetRegAND(SiS_Pr->SiS_P3c4,0x37,0xFE);
      if(ModeNo <= 0x13) {
	 if(ModeNo == 0x06 || ModeNo >= 0x0e) {
	    SiS_SetReg(SiS_Pr->SiS_P3c4,0x0e,0x20);
	 }
      }
   }
}

/*********************************************/
/*                 RESET VCLK                */
/*********************************************/

static void
SiS_ResetCRT1VCLK(struct SiS_Private *SiS_Pr)
{
   if(SiS_Pr->ChipType >= SIS_315H) {
      if(SiS_Pr->ChipType < SIS_661) {
	 if(SiS_Pr->SiS_IF_DEF_LVDS == 0) return;
      }
   } else {
      if((SiS_Pr->SiS_IF_DEF_LVDS == 0) &&
	 (!(SiS_Pr->SiS_VBType & VB_SIS30xBLV)) ) {
	 return;
      }
   }

   SiS_SetRegANDOR(SiS_Pr->SiS_P3c4,0x31,0xcf,0x20);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x2B,SiS_Pr->SiS_VCLKData[1].SR2B);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x2C,SiS_Pr->SiS_VCLKData[1].SR2C);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x2D,0x80);
   SiS_SetRegANDOR(SiS_Pr->SiS_P3c4,0x31,0xcf,0x10);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x2B,SiS_Pr->SiS_VCLKData[0].SR2B);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x2C,SiS_Pr->SiS_VCLKData[0].SR2C);
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x2D,0x80);
}

/*********************************************/
/*                  SYNC                     */
/*********************************************/

static void
SiS_SetCRT1Sync(struct SiS_Private *SiS_Pr, unsigned short RRTI)
{
   unsigned short sync;

   if(SiS_Pr->UseCustomMode) {
      sync = SiS_Pr->CInfoFlag >> 8;
   } else {
      sync = SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag >> 8;
   }

   sync &= 0xC0;
   sync |= 0x2f;
   SiS_SetRegByte(SiS_Pr->SiS_P3c2,sync);
}

/*********************************************/
/*                  CRTC/2                   */
/*********************************************/

static void
SiS_SetCRT1CRTC(struct SiS_Private *SiS_Pr, unsigned short ModeNo,
		unsigned short ModeIdIndex, unsigned short RRTI)
{
   unsigned short temp, i, j, modeflag;
   unsigned char  *crt1data = NULL;

   modeflag = SiS_GetModeFlag(SiS_Pr, ModeNo, ModeIdIndex);

   if(SiS_Pr->UseCustomMode) {

      crt1data = &SiS_Pr->CCRT1CRTC[0];

   } else {

      temp = SiS_GetRefCRT1CRTC(SiS_Pr, RRTI, SiS_Pr->SiS_UseWide);

      /* Alternate for 1600x1200 LCDA */
      if((temp == 0x20) && (SiS_Pr->Alternate1600x1200)) temp = 0x57;

      crt1data = (unsigned char *)&SiS_Pr->SiS_CRT1Table[temp].CR[0];

   }

   /* unlock cr0-7 */
   SiS_SetRegAND(SiS_Pr->SiS_P3d4,0x11,0x7f);

   for(i = 0, j = 0; i <= 7; i++, j++) {
      SiS_SetReg(SiS_Pr->SiS_P3d4,j,crt1data[i]);
   }
   for(j = 0x10; i <= 10; i++, j++) {
      SiS_SetReg(SiS_Pr->SiS_P3d4,j,crt1data[i]);
   }
   for(j = 0x15; i <= 12; i++, j++) {
      SiS_SetReg(SiS_Pr->SiS_P3d4,j,crt1data[i]);
   }
   for(j = 0x0A; i <= 15; i++, j++) {
      SiS_SetReg(SiS_Pr->SiS_P3c4,j,crt1data[i]);
   }

   SiS_SetReg(SiS_Pr->SiS_P3c4,0x0E,crt1data[16] & 0xE0);

   temp = (crt1data[16] & 0x01) << 5;
   if(modeflag & DoubleScanMode) temp |= 0x80;
   SiS_SetRegANDOR(SiS_Pr->SiS_P3d4,0x09,0x5F,temp);

   if(SiS_Pr->SiS_ModeType > ModeVGA) {
      SiS_SetReg(SiS_Pr->SiS_P3d4,0x14,0x4F);
   }

#ifdef CONFIG_FB_SIS_315
   if(SiS_Pr->ChipType == XGI_20) {
      SiS_SetReg(SiS_Pr->SiS_P3d4,0x04,crt1data[4] - 1);
      if(!(temp = crt1data[5] & 0x1f)) {
         SiS_SetRegAND(SiS_Pr->SiS_P3c4,0x0c,0xfb);
      }
      SiS_SetRegANDOR(SiS_Pr->SiS_P3d4,0x05,0xe0,((temp - 1) & 0x1f));
      temp = (crt1data[16] >> 5) + 3;
      if(temp > 7) temp -= 7;
      SiS_SetRegANDOR(SiS_Pr->SiS_P3c4,0x0e,0x1f,(temp << 5));
   }
#endif
}

/*********************************************/
/*               OFFSET & PITCH              */
/*********************************************/
/*  (partly overruled by SetPitch() in XF86) */
/*********************************************/

static void
SiS_SetCRT1Offset(struct SiS_Private *SiS_Pr, unsigned short ModeNo,
		unsigned short ModeIdIndex, unsigned short RRTI)
{
   unsigned short temp, DisplayUnit, infoflag;

   if(SiS_Pr->UseCustomMode) {
      infoflag = SiS_Pr->CInfoFlag;
   } else {
      infoflag = SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag;
   }

   DisplayUnit = SiS_GetOffset(SiS_Pr, ModeNo, ModeIdIndex, RRTI);

   temp = (DisplayUnit >> 8) & 0x0f;
   SiS_SetRegANDOR(SiS_Pr->SiS_P3c4,0x0E,0xF0,temp);

   SiS_SetReg(SiS_Pr->SiS_P3d4,0x13,DisplayUnit & 0xFF);

   if(infoflag & InterlaceMode) DisplayUnit >>= 1;

   DisplayUnit <<= 5;
   temp = (DisplayUnit >> 8) + 1;
   if(DisplayUnit & 0xff) temp++;
   if(SiS_Pr->ChipType == XGI_20) {
      if(ModeNo == 0x4a || ModeNo == 0x49) temp--;
   }
   SiS_SetReg(SiS_Pr->SiS_P3c4,0x10,temp);
}

/*********************************************/
/*                  VCLK                     */
/*********************************************/

static void
SiS_SetCRT1VCLK(struc