mga_driver.c   [plain text]

/* $XConsortium: mga_driver.c /main/12 1996/10/28 05:13:26 kaleb $ */
/*
 * MGA Millennium (MGA2064W) with Ti3026 RAMDAC driver v.1.1
 *
 * The driver is written without any chip documentation. All extended ports
 * and registers come from tracing the VESA-ROM functions.
 * The BitBlt Engine comes from tracing the windows BitBlt function.
 *
 * Author:	Radoslaw Kapitan, Tarnow, Poland
 *			kapitan@student.uci.agh.edu.pl
 *		original source
 *
 * Now that MATROX has released documentation to the public, enhancing
 * this driver has become much easier. Nevertheless, this work continues
 * to be based on Radoslaw's original source
 *
 * Contributors:
 *		Andrew van der Stock
 *			ajv@greebo.net
 *		additions, corrections, cleanups
 *
 *		Dirk Hohndel
 *			hohndel@XFree86.Org
 *		integrated into XFree86-3.1.2Gg
 *		fixed some problems with PCI probing and mapping
 *
 *		David Dawes
 *			dawes@XFree86.Org
 *		some cleanups, and fixed some problems
 *
 *		Andrew E. Mileski
 *			aem@ott.hookup.net
 *		RAMDAC timing, and BIOS stuff
 *
 *		Leonard N. Zubkoff
 *			lnz@dandelion.com
 *		Support for 8MB boards, RGB Sync-on-Green, and DPMS.
 *		Guy DESBIEF
 *			g.desbief@aix.pacwan.net
 *		RAMDAC MGA1064 timing,
 *		Doug Merritt
 *			doug@netcom.com
 *		Fixed 32bpp hires 8MB horizontal line glitch at middle right
 *		Niels Gram Jeppesen
 *		Added digital screen option for first head
 */
 
/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/mga/mga_driver.c,v 1.245 2004/02/20 16:59:49 tsi Exp $ */

/*
 * This is a first cut at a non-accelerated version to work with the
 * new server design (DHD).
 */


/* All drivers should typically include these */
#include "xf86.h"
#include "xf86_OSproc.h"
#include "xf86Resources.h"

/* All drivers need this */
#include "xf86_ansic.h"

#include "compiler.h"

/* Drivers for PCI hardware need this */
#include "xf86PciInfo.h"

/* Drivers that need to access the PCI config space directly need this */
#include "xf86Pci.h"

/* All drivers initialising the SW cursor need this */
#include "mipointer.h"

/* All drivers implementing backing store need this */
#include "mibstore.h"

#include "micmap.h"

#include "xf86DDC.h"
#include "xf86RAC.h"
#include "vbe.h"

#include "fb.h"
#include "cfb8_32.h"
#include "dixstruct.h"

#include "mga_reg.h"
#include "mga.h"
#include "mga_macros.h"

#include "xaa.h"
#include "xf86cmap.h"
#include "shadowfb.h"
#include "fbdevhw.h"

#ifdef XF86DRI
#include "dri.h"
#endif

/*
 * Forward definitions for the functions that make up the driver.
 */

/* Mandatory functions */
static const OptionInfoRec *	MGAAvailableOptions(int chipid, int busid);
static void	MGAIdentify(int flags);
static Bool	MGAProbe(DriverPtr drv, int flags);
static Bool	MGAPreInit(ScrnInfoPtr pScrn, int flags);
static Bool	MGAScreenInit(int Index, ScreenPtr pScreen, int argc,
			      char **argv);
static Bool	MGAEnterVT(int scrnIndex, int flags);
static Bool	MGAEnterVTFBDev(int scrnIndex, int flags);
static void	MGALeaveVT(int scrnIndex, int flags);
static Bool	MGACloseScreen(int scrnIndex, ScreenPtr pScreen);
static Bool	MGASaveScreen(ScreenPtr pScreen, int mode);
static Bool	MGASaveScreenCrtc2(ScreenPtr pScreen, int mode);

/* This shouldn't be needed since RAC will disable all I/O for MGA cards. */
#ifdef DISABLE_VGA_IO
static void     VgaIOSave(int i, void *arg);
static void     VgaIORestore(int i, void *arg);
#endif

/* Optional functions */
static void	MGAFreeScreen(int scrnIndex, int flags);
static ModeStatus MGAValidMode(int scrnIndex, DisplayModePtr mode,
			       Bool verbose, int flags);

/* Internally used functions */
static Bool	MGAMapMem(ScrnInfoPtr pScrn);
static Bool	MGAUnmapMem(ScrnInfoPtr pScrn);
static void	MGASave(ScrnInfoPtr pScrn);
static void	MGARestore(ScrnInfoPtr pScrn);
static Bool	MGAModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode);
static void 	MGABlockHandler(int, pointer, pointer, pointer);
static void	MGAG100BlackMagic(ScrnInfoPtr pScrn);

static int MGAEntityIndex = -1;

#include "mga_merge.h"


/*
 * This contains the functions needed by the server after loading the
 * driver module.  It must be supplied, and gets added the driver list by
 * the Module Setup funtion in the dynamic case.  In the static case a
 * reference to this is compiled in, and this requires that the name of
 * this DriverRec be an upper-case version of the driver name.
 */

DriverRec MGA_C_NAME = {
    MGA_VERSION,
    MGA_DRIVER_NAME,
    MGAIdentify,
    MGAProbe,
    MGAAvailableOptions,
    NULL,
    0
};

/* Supported chipsets */
static SymTabRec MGAChipsets[] = {
    { PCI_CHIP_MGA2064,		"mga2064w" },
    { PCI_CHIP_MGA1064,		"mga1064sg" },
    { PCI_CHIP_MGA2164,		"mga2164w" },
    { PCI_CHIP_MGA2164_AGP,	"mga2164w AGP" },
    { PCI_CHIP_MGAG100,		"mgag100" },
    { PCI_CHIP_MGAG100_PCI,	"mgag100 PCI" },
    { PCI_CHIP_MGAG200,		"mgag200" },
    { PCI_CHIP_MGAG200_PCI,	"mgag200 PCI" },
    { PCI_CHIP_MGAG400,		"mgag400" },
    { PCI_CHIP_MGAG550,		"mgag550" },
    {-1,			NULL }
};

static PciChipsets MGAPciChipsets[] = {
    { PCI_CHIP_MGA2064,	    PCI_CHIP_MGA2064,	(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGA1064,	    PCI_CHIP_MGA1064,	(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGA2164,	    PCI_CHIP_MGA2164,	(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGA2164_AGP, PCI_CHIP_MGA2164_AGP,(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGAG100,	    PCI_CHIP_MGAG100,	(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGAG100_PCI, PCI_CHIP_MGAG100_PCI,(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGAG200,	    PCI_CHIP_MGAG200,	(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGAG200_PCI, PCI_CHIP_MGAG200_PCI,(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGAG400,	    PCI_CHIP_MGAG400,	(resRange*)RES_SHARED_VGA },
    { PCI_CHIP_MGAG550,	    PCI_CHIP_MGAG550,	(resRange*)RES_SHARED_VGA },
    { -1,			-1,		(resRange*)RES_UNDEFINED }
};

static const OptionInfoRec MGAOptions[] = {
    { OPTION_SW_CURSOR,		"SWcursor",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_HW_CURSOR,		"HWcursor",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_PCI_RETRY,		"PciRetry",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_SYNC_ON_GREEN,	"SyncOnGreen",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_NOACCEL,		"NoAccel",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_SHOWCACHE,		"ShowCache",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_OVERLAY,		"Overlay",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_MGA_SDRAM,		"MGASDRAM",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_SHADOW_FB,		"ShadowFB",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_FBDEV,		"UseFBDev",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_COLOR_KEY,		"ColorKey",	OPTV_INTEGER,	{0}, FALSE },
    { OPTION_SET_MCLK,		"SetMclk",	OPTV_FREQ,	{0}, FALSE },
    { OPTION_OVERCLOCK_MEM,	"OverclockMem",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_VIDEO_KEY,		"VideoKey",	OPTV_INTEGER,	{0}, FALSE },
    { OPTION_ROTATE,		"Rotate",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_TEXTURED_VIDEO,	"TexturedVideo",OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_CRTC2HALF,		"Crtc2Half",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_CRTC2RAM,		"Crtc2Ram",	OPTV_INTEGER,	{0}, FALSE },
    { OPTION_INT10,		"Int10",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_AGP_MODE,		"AGPMode",	OPTV_INTEGER,	{0}, FALSE },
    { OPTION_AGP_SIZE,		"AGPSize",      OPTV_INTEGER,   {0}, FALSE },
    { OPTION_DIGITAL1,		"DigitalScreen1",OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_DIGITAL2,		"DigitalScreen2",OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_TV,		"TV",		OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_TVSTANDARD,	"TVStandard",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_CABLETYPE,		"CableType",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_NOHAL,		"NoHal",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_SWAPPED_HEAD,	"SwappedHead",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_DRI,		"DRI",		OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_MERGEDFB,		"MergedFB",	OPTV_BOOLEAN,	{0}, FALSE },
    { OPTION_HSYNC2,	"Monitor2HSync",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_VREFRESH2,	"Monitor2VRefresh",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_MONITOR2POS,   "Monitor2Position",	OPTV_ANYSTR,	{0}, FALSE },
    { OPTION_METAMODES,   "MetaModes",  	OPTV_ANYSTR,	{0}, FALSE },
    { -1,			NULL,		OPTV_NONE,	{0}, FALSE }
};


/*
 * List of symbols from other modules that this module references.  This
 * list is used to tell the loader that it is OK for symbols here to be
 * unresolved providing that it hasn't been told that they haven't been
 * told that they are essential via a call to xf86LoaderReqSymbols() or
 * xf86LoaderReqSymLists().  The purpose is this is to avoid warnings about
 * unresolved symbols that are not required.
 */

static const char *vgahwSymbols[] = {
    "vgaHWFreeHWRec",
    "vgaHWGetHWRec",
    "vgaHWGetIOBase",
    "vgaHWGetIndex",
    "vgaHWInit",
    "vgaHWLock",
    "vgaHWMapMem",
    "vgaHWProtect",
    "vgaHWRestore",
    "vgaHWSave",
    "vgaHWSaveScreen",
    "vgaHWSetMmioFuncs",
    "vgaHWUnlock",
    "vgaHWUnmapMem",
    "vgaHWddc1SetSpeed",
    NULL
};

static const char *fbSymbols[] = {
    "fbPictureInit",
    "fbScreenInit",
    NULL
};

static const char *xf8_32bppSymbols[] = {
    "cfb8_32ScreenInit",
    "xf86Overlay8Plus32Init",
    NULL
};

static const char *xaaSymbols[] = {
    "XAACachePlanarMonoStipple",
    "XAACreateInfoRec",
    "XAADestroyInfoRec",
    "XAAFallbackOps",
    "XAAInit",
    "XAAMoveDWORDS",
    "XAA_888_plus_PICT_a8_to_8888",
    NULL
};

static const char *ramdacSymbols[] = {
    "xf86CreateCursorInfoRec",
    "xf86DestroyCursorInfoRec",
    "xf86InitCursor",
    NULL
};

#ifdef XF86DRI
static const char *drmSymbols[] = {
    "drmAddBufs",
    "drmAddMap",
    "drmAgpAcquire",
    "drmAgpAlloc",
    "drmAgpBind",
    "drmAgpDeviceId",
    "drmAgpEnable",
    "drmAgpFree",
    "drmAgpGetMode",
    "drmAgpRelease",
    "drmAgpUnbind",
    "drmAgpVendorId",
    "drmCommandNone",
    "drmCommandWrite",
    "drmCtlInstHandler",
    "drmCtlUninstHandler",
    "drmFreeVersion",
    "drmGetInterruptFromBusID",
    "drmGetLibVersion",
    "drmGetVersion",
    "drmMap",
    "drmMapBufs",
    "drmUnmap",
    "drmUnmapBufs",
    NULL
};

static const char *driSymbols[] = {
    "DRICloseScreen",
    "DRICreateInfoRec",
    "DRIDestroyInfoRec",
    "DRIFinishScreenInit",
    "DRIGetDeviceInfo",
    "DRILock",
    "DRIQueryVersion",
    "DRIScreenInit",
    "DRIUnlock",
    "GlxSetVisualConfigs",
    NULL
};
#endif

#define MGAuseI2C 1

static const char *ddcSymbols[] = {
    "xf86DoEDID_DDC1",
#if MGAuseI2C
    "xf86DoEDID_DDC2",
#endif
    "xf86PrintEDID",
    "xf86SetDDCproperties",
    NULL
};

static const char *i2cSymbols[] = {
    "xf86CreateI2CBusRec",
    "xf86I2CBusInit",
    NULL
};

static const char *shadowSymbols[] = {
    "ShadowFBInit",
    NULL
};

#ifdef XFree86LOADER
static const char *vbeSymbols[] = {
    "VBEInit",
    "vbeDoEDID",
    "vbeFree",
    NULL
};
#endif

static const char *int10Symbols[] = {
    "xf86FreeInt10",
    "xf86InitInt10",
    NULL
};

static const char *fbdevHWSymbols[] = {
    "fbdevHWAdjustFrame",
    "fbdevHWEnterVT",
    "fbdevHWGetVidmem",
    "fbdevHWInit",
    "fbdevHWLeaveVT",
    "fbdevHWLoadPalette",
    "fbdevHWMapMMIO",
    "fbdevHWMapVidmem",
    "fbdevHWModeInit",
    "fbdevHWRestore",
    "fbdevHWSave",
    "fbdevHWSwitchMode",
    "fbdevHWUnmapMMIO",
    "fbdevHWUnmapVidmem",
    "fbdevHWUseBuildinMode",
    "fbdevHWValidMode",
    NULL
};

#ifdef USEMGAHAL
static const char *halSymbols[] = {
  "MGACloseLibrary",
  "MGAGetBOARDHANDLESize",
  "MGAGetHardwareInfo",
  "MGAOpenLibrary",
  "MGARestoreVgaState",
  "MGASaveVgaState",
  "MGASetMode",
  "MGASetVgaMode",
  "MGAValidateMode",
  "MGAValidateVideoParameters",
  "HALSetDisplayStart",
  NULL
};
#endif
#ifdef XFree86LOADER

static MODULESETUPPROTO(mgaSetup);

static XF86ModuleVersionInfo mgaVersRec =
{
	MGA_DRIVER_NAME,
	MODULEVENDORSTRING,
	MODINFOSTRING1,
	MODINFOSTRING2,
	XF86_VERSION_CURRENT,
	MGA_MAJOR_VERSION, MGA_MINOR_VERSION, MGA_PATCHLEVEL,
	ABI_CLASS_VIDEODRV,			/* This is a video driver */
	ABI_VIDEODRV_VERSION,
	MOD_CLASS_VIDEODRV,
	{0,0,0,0}
};

XF86ModuleData MGA_MODULE_DATA = { &mgaVersRec, mgaSetup, NULL };

static pointer
mgaSetup(pointer module, pointer opts, int *errmaj, int *errmin)
{
    static Bool setupDone = FALSE;

    /* This module should be loaded only once, but check to be sure. */

    if (!setupDone) {
	setupDone = TRUE;
	xf86AddDriver(&MGA_C_NAME, module, 0);

	/*
	 * Modules that this driver always requires may be loaded here
	 * by calling LoadSubModule().
	 */

	/*
	 * Tell the loader about symbols from other modules that this module
	 * might refer to.
	 */
	LoaderRefSymLists(vgahwSymbols, xaaSymbols,
			  xf8_32bppSymbols, ramdacSymbols,
			  ddcSymbols, i2cSymbols, shadowSymbols,
			  fbdevHWSymbols, vbeSymbols,
			  fbSymbols, int10Symbols,
#ifdef XF86DRI
			  drmSymbols, driSymbols,
#endif
#ifdef USEMGAHAL
			  halSymbols,
#endif
			  NULL);

	/*
	 * The return value must be non-NULL on success even though there
	 * is no TearDownProc.
	 */
	return (pointer)1;
    } else {
	if (errmaj) *errmaj = LDR_ONCEONLY;
	return NULL;
    }
}


#endif /* XFree86LOADER */

/*
 * ramdac info structure initialization
 */
static MGARamdacRec DacInit = {
	FALSE, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL,
	90000, /* maxPixelClock */
	0, X_DEFAULT, X_DEFAULT, FALSE
};

Bool
MGAGetRec(ScrnInfoPtr pScrn)
{
    /*
     * Allocate an MGARec, and hook it into pScrn->driverPrivate.
     * pScrn->driverPrivate is initialised to NULL, so we can check if
     * the allocation has already been done.
     */
    if (pScrn->driverPrivate != NULL)
	return TRUE;

    pScrn->driverPrivate = xnfcalloc(sizeof(MGARec), 1);
    /* Initialise it */

    MGAPTR(pScrn)->Dac = DacInit;
    return TRUE;
}

void
MGAFreeRec(ScrnInfoPtr pScrn)
{
    if (pScrn->driverPrivate == NULL)
	return;
    xfree(pScrn->driverPrivate);
    pScrn->driverPrivate = NULL;
}

static const OptionInfoRec *
MGAAvailableOptions(int chipid, int busid)
{
    return MGAOptions;
}

/* Mandatory */
static void
MGAIdentify(int flags)
{
    xf86PrintChipsets(MGA_NAME, "driver for Matrox chipsets", MGAChipsets);
}


/* Mandatory */
static Bool
MGAProbe(DriverPtr drv, int flags)
{
    int i;
    GDevPtr *devSections;
    int *usedChips = NULL;
    int numDevSections;
    int numUsed;
    Bool foundScreen = FALSE;

    /*
     * The aim here is to find all cards that this driver can handle,
     * and for the ones not already claimed by another driver, claim the
     * slot, and allocate a ScrnInfoRec.
     *
     * This should be a minimal probe, and it should under no circumstances
     * change the state of the hardware.  Because a device is found, don't
     * assume that it will be used.  Don't do any initialisations other than
     * the required ScrnInfoRec initialisations.  Don't allocate any new
     * data structures.
     */

    /*
     * Check if there has been a chipset override in the config file.
     * For this we must find out if there is an active device section which
     * is relevant, i.e., which has no driver specified or has THIS driver
     * specified.
     */

    if ((numDevSections = xf86MatchDevice(MGA_DRIVER_NAME,
					  &devSections)) <= 0) {
	/*
	 * There's no matching device section in the config file, so quit
	 * now.
	 */
	return FALSE;
    }

    /*
     * We need to probe the hardware first.  We then need to see how this
     * fits in with what is given in the config file, and allow the config
     * file info to override any contradictions.
     */

    /*
     * All of the cards this driver supports are PCI, so the "probing" just
     * amounts to checking the PCI data that the server has already collected.
     */
    if (xf86GetPciVideoInfo() == NULL) {
	/*
	 * We won't let anything in the config file override finding no
	 * PCI video cards at all.  This seems reasonable now, but we'll see.
	 */
	return FALSE;
    }

    numUsed = xf86MatchPciInstances(MGA_NAME, PCI_VENDOR_MATROX,
			            MGAChipsets, MGAPciChipsets, devSections,
			            numDevSections, drv, &usedChips);
    /* Free it since we don't need that list after this */
    xfree(devSections);
    if (numUsed <= 0)
	return FALSE;

   
    if (flags & PROBE_DETECT)
	foundScreen = TRUE;
    else for (i = 0; i < numUsed; i++) {
	ScrnInfoPtr pScrn;
	EntityInfoPtr pEnt;
#ifdef DISABLE_VGA_IO
	MgaSavePtr smga;
#endif

	/* Allocate a ScrnInfoRec and claim the slot */
	pScrn = NULL;

#ifndef DISABLE_VGA_IO
	if ((pScrn = xf86ConfigPciEntity(pScrn, 0,usedChips[i],
                                         MGAPciChipsets, NULL, NULL,
                                         NULL, NULL, NULL)))
#else
	    smga = xnfalloc(sizeof(MgaSave));
	    smga->pvp = xf86GetPciInfoForEntity(usedChips[i]);
	    if ((pScrn = xf86ConfigPciEntity(pScrn, 0,usedChips[i],
					       MGAPciChipsets, NULL,VgaIOSave,
					       VgaIOSave, VgaIORestore,smga)))
#endif
	    {

	/* Fill in what we can of the ScrnInfoRec */
		pScrn->driverVersion	= MGA_VERSION;
		pScrn->driverName	= MGA_DRIVER_NAME;
		pScrn->name		= MGA_NAME;
		pScrn->Probe		= MGAProbe;
		pScrn->PreInit		= MGAPreInit;
		pScrn->ScreenInit	= MGAScreenInit;
		pScrn->SwitchMode	= MGASwitchMode;
		pScrn->AdjustFrame	= MGAAdjustFrame;
		pScrn->EnterVT		= MGAEnterVT;
		pScrn->LeaveVT		= MGALeaveVT;
		pScrn->FreeScreen	= MGAFreeScreen;
		pScrn->ValidMode	= MGAValidMode;

		foundScreen = TRUE;
	    }

	/*
	 * For cards that can do dual head per entity, mark the entity
	 * as sharable. 
	 */
	pEnt = xf86GetEntityInfo(usedChips[i]);
	if ((pEnt->chipset == PCI_CHIP_MGAG400 || pEnt->chipset == PCI_CHIP_MGAG550)) {
	    MGAEntPtr pMgaEnt = NULL;
	    DevUnion *pPriv;

	    xf86SetEntitySharable(usedChips[i]);
	    /* Allocate an entity private if necessary */
	    if (MGAEntityIndex < 0)
		MGAEntityIndex = xf86AllocateEntityPrivateIndex();
	    pPriv = xf86GetEntityPrivate(pScrn->entityList[0], MGAEntityIndex);
	    if (!pPriv->ptr) {
		pPriv->ptr = xnfcalloc(sizeof(MGAEntRec), 1);
		pMgaEnt = pPriv->ptr;
		pMgaEnt->lastInstance = -1;
	    } else {
		pMgaEnt = pPriv->ptr;
	    }
	    /*
	     * Set the entity instance for this instance of the driver.  For
	     * dual head per card, instance 0 is the "master" instance, driving
	     * the primary head, and instance 1 is the "slave".
	     */
	    pMgaEnt->lastInstance++;
	    xf86SetEntityInstanceForScreen(pScrn, pScrn->entityList[0],
					   pMgaEnt->lastInstance);
	}
    }

    xfree(usedChips);

    return foundScreen;
}


/*
 * Should aim towards not relying on this.
 */

/*
 * MGAReadBios - Read the video BIOS info block.
 *
 * DESCRIPTION
 *   Warning! This code currently does not detect a video BIOS.
 *   In the future, support for motherboards with the mga2064w
 *   will be added (no video BIOS) - this is not a huge concern
 *   for me today though.  (XXX)
 *
 * EXTERNAL REFERENCES
 *   vga256InfoRec.BIOSbase	IN	Physical address of video BIOS.
 *   MGABios			OUT	The video BIOS info block.
 *
 * HISTORY
 *   August  31, 1997 - [ajv] Andrew van der Stock
 *   Fixed to understand Mystique and Millennium II
 *
 *   January 11, 1997 - [aem] Andrew E. Mileski
 *   Set default values for GCLK (= MCLK / pre-scale ).
 *
 *   October 7, 1996 - [aem] Andrew E. Mileski
 *   Written and tested.
 */

void
MGAReadBios(ScrnInfoPtr pScrn)
{
	CARD8  BIOS[0x10000];
	CARD16 offset;
	CARD8	chksum;
	CARD8	*pPINSInfo;
	MGAPtr pMga;
	MGABiosInfo *pBios;
	MGABios2Info *pBios2;
	Bool pciBIOS = TRUE;
	int rlen;

	pMga = MGAPTR(pScrn);
	pBios = &pMga->Bios;
	pBios2 = &pMga->Bios2;
        
	/* Get the output mode set by the BIOS */
	xf86ReadDomainMemory(pMga->PciTag, pMga->BiosAddress + 0x7ff1u,
			     sizeof(CARD8), &pMga->BiosOutputMode); 

	/*
	 * If the BIOS address was probed, it was found from the PCI config
	 * space.  If it was given in the config file, try to guess when it
	 * looks like it might be controlled by the PCI config space.
	 */
	if (pMga->BiosFrom == X_DEFAULT)
	    pciBIOS = FALSE;
	else if (pMga->BiosFrom == X_CONFIG && pMga->BiosAddress < 0x100000)
	    pciBIOS = TRUE;

	if (pciBIOS)
	    rlen = xf86ReadPciBIOS(0, pMga->PciTag, pMga->FbBaseReg,
				   BIOS, sizeof(BIOS));
	else
	    rlen = xf86ReadDomainMemory(pMga->PciTag, pMga->BiosAddress,
					sizeof(BIOS), BIOS);

	if (rlen < (BIOS[2] << 9)) {
		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			   "Could not retrieve video BIOS!\n");
		return;
	}
        
        /* Get the video BIOS info block */
	if (strncmp((char *)(&BIOS[45]), "MATROX", 6)) {
		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			       "Video BIOS info block not detected!\n");
		return;
	}

	/* Get the info block offset */
	offset = (BIOS[0x7ffd] << 8) | BIOS[0x7ffc];

	/* Let the world know what we are up to */
	xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
		   "Video BIOS info block at offset 0x%05lX\n",
		   (long)(offset));

#define MGADoBIOSRead(offset, buf, len) memcpy(buf, &BIOS[offset], len)

	/* Copy the info block */
	/* XXX What about big-endianness? */
	switch (pMga->Chipset){
	   case PCI_CHIP_MGA2064:
		MGADoBIOSRead(offset,
			( CARD8 * ) & pBios->StructLen, sizeof( MGABiosInfo ));
		break;
	   default:
		MGADoBIOSRead(offset,
			( CARD8 * ) & pBios2->PinID, sizeof( MGABios2Info ));
                break;
	}

	/* matrox millennium-2 and mystique pins info */
	if ( pBios2->PinID == 0x412e ) {
	    int i;
	    /* check that the pins info is correct */
	    if ( pBios2->StructLen != 0x40 ) {
		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			"Video BIOS info block not detected!\n");
		pBios2->PinID = 0;
		return;
	    }
	    /* check that the chksum is correct */
	    chksum = 0;
	    pPINSInfo = (CARD8 *) &pBios2->PinID;

	    for (i=0; i < pBios2->StructLen; i++) {
		chksum += *pPINSInfo;
		pPINSInfo++;
	    }

	    if ( chksum ) {
		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
			"Video BIOS info block did not checksum!\n");
		pBios2->PinID = 0;
		return;
	    }

	    /* last check */
	    if ( pBios2->StructRev == 0 ) {
		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
		  "Video BIOS info block does not have a valid revision!\n");
		pBios2->PinID = 0;
		return;
	    }

	    xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
		"Found and verified enhanced Video BIOS info block\n");

	   /* Set default MCLK values (scaled by 100 kHz) */
	   if ( pBios2->ClkMem == 0 )
		pBios2->ClkMem = 50;
	   if ( pBios2->Clk4MB == 0 )
		pBios2->Clk4MB = pBios->ClkBase;
	   if ( pBios2->Clk8MB == 0 )
		pBios2->Clk8MB = pBios->Clk4MB;
	   pBios->StructLen = 0; /* not in use */
#ifdef DEBUG
	   for (i = 0; i < 0x40; i++)
	      ErrorF("Pins[0x%02x] is 0x%02x\n", i,
			((unsigned char *)pBios2)[i]);
#endif
	} else {
	  /* Set default MCLK values (scaled by 10 kHz) */
	  if ( pBios->ClkBase == 0 )
		pBios->ClkBase = 4500;
  	  if ( pBios->Clk4MB == 0 )
		pBios->Clk4MB = pBios->ClkBase;
	  if ( pBios->Clk8MB == 0 )
		pBios->Clk8MB = pBios->Clk4MB;
	  pBios2->PinID = 0; /* not in use */
	}
}

/*
 * MGASoftReset --
 *
 * Resets drawing engine
 */
void
MGASoftReset(ScrnInfoPtr pScrn)
{
	MGAPtr pMga = MGAPTR(pScrn);

	pMga->FbMapSize = 8192 * 1024;
	MGAMapMem(pScrn);

	/* set soft reset bit */
	OUTREG(MGAREG_Reset, 1);
	usleep(200);
	OUTREG(MGAREG_Reset, 0);

	/* reset memory */
	OUTREG(MGAREG_MACCESS, 1<<15);
	usleep(10);

#if 0
	/* This will hang if the PLLs aren't on */

	/* wait until drawing engine is ready */
	while ( MGAISBUSY() )
	    usleep(1000);

	/* flush FIFO */
	i = 32;
	WAITFIFO(i);
	while ( i-- )
	    OUTREG(MGAREG_SHIFT, 0);
#endif

	MGAUnmapMem(pScrn);
}

/*
 * MGACountRAM --
 *
 * Counts amount of installed RAM
 */
static int
MGACountRam(ScrnInfoPtr pScrn)
{
    MGAPtr pMga = MGAPTR(pScrn);
    int ProbeSize = 8192;
    int SizeFound = 2048;
    CARD32 biosInfo = 0;

#if 0
    /* This isn't correct. It looks like this can have arbitrary
	data for the memconfig even when the bios has initialized
	it.  At least, my cards don't advertise the documented
	values (my 8 and 16 Meg G200s have the same values) */
    if(pMga->Primary) /* can only trust this for primary cards */
	biosInfo = pciReadLong(pMga->PciTag, PCI_OPTION_REG);
#endif

    switch(pMga->Chipset) {
    case PCI_CHIP_MGA2164:
    case PCI_CHIP_MGA2164_AGP:
	xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
		"Unable to probe memory amount due to hardware bug.  "
		"Assuming 4096 KB\n");
	return 4096;
    case PCI_CHIP_MGAG400:
    case PCI_CHIP_MGAG550:
	if(biosInfo) {
	    switch((biosInfo >> 10) & 0x07) {
	    case 0:
		return (biosInfo & (1 << 14)) ? 32768 : 16384;
	    case 1:
	    case 2:
		return 16384;
	    case 3:
	    case 5:
		return 65536;
	    case 4:
		return 32768;
	    }
	}
	ProbeSize = 32768;
	break;
    case PCI_CHIP_MGAG200:
    case PCI_CHIP_MGAG200_PCI:
	if(biosInfo) {
	    switch((biosInfo >> 11) & 0x03) {
	    case 0:
		return 8192;
	    default:
		return 16384;
	    }
	}
	ProbeSize = 8192;
	break;
    case PCI_CHIP_MGAG100:
    case PCI_CHIP_MGAG100_PCI:
	if(biosInfo) /* I'm not sure if the docs are correct */
	    return (biosInfo & (1 << 12)) ? 16384 : 8192;
    case PCI_CHIP_MGA1064:
    case PCI_CHIP_MGA2064:
	ProbeSize = 8192;
        break;
    default:
        break;
    }

    if (pMga->FbAddress) {
	volatile unsigned char* base;
	unsigned char tmp;
	int i;

	pMga->FbMapSize = ProbeSize * 1024;
	MGAMapMem(pScrn);
	base = pMga->FbBase;

	/* turn MGA mode on - enable linear frame buffer (CRTCEXT3) */
	OUTREG8(MGAREG_CRTCEXT_INDEX, 3);
	tmp = INREG8(MGAREG_CRTCEXT_DATA);
	OUTREG8(MGAREG_CRTCEXT_DATA, tmp | 0x80);

	/* write, read and compare method
	   split into two loops to make it more reliable on RS/6k -ReneR */
	for(i = ProbeSize; i > 2048; i -= 2048) {
	    base[(i * 1024) - 1] = 0xAA;
	}
	OUTREG8(MGAREG_CRTC_INDEX, 0);  /* flush the cache */
	usleep(4);  /* twart write combination */
	for(i = ProbeSize; i > 2048; i -= 2048) {
	    if(base[(i * 1024) - 1] == 0xAA) {
		SizeFound = i;
		break;
	    }
	}

	/* restore CRTCEXT3 state */
	OUTREG8(MGAREG_CRTCEXT_INDEX, 3);
	OUTREG8(MGAREG_CRTCEXT_DATA, tmp);

	MGAUnmapMem(pScrn);
   }
   return SizeFound;
}

static xf86MonPtr
MGAdoDDC(ScrnInfoPtr pScrn)
{
  vgaHWPtr hwp;
  MGAPtr pMga;
  xf86MonPtr MonInfo = NULL;

  hwp = VGAHWPTR(pScrn);
  pMga = MGAPTR(pScrn);

  /* Load DDC if we have the code to use it */
  /* This gives us DDC1 */
  if (pMga->ddc1Read || pMga->i2cInit) {
      if (xf86LoadSubModule(pScrn, "ddc")) {
	  xf86LoaderReqSymLists(ddcSymbols, NULL);
	} else {
	  /* ddc module not found, we can do without it */
	  pMga->ddc1Read = NULL;

	  /* Without DDC, we have no use for the I2C bus */
	  pMga->i2cInit = NULL;
	  return NULL;
	}
    } else 
      return NULL;

#if MGAuseI2C
    /* - DDC can use I2C bus */
    /* Load I2C if we have the code to use it */
    if (pMga->i2cInit) {
      if ( xf86LoadSubModule(pScrn, "i2c") ) {
	xf86LoaderReqSymLists(i2cSymbols,NULL);
      } else {
	/* i2c module not found, we can do without it */
	pMga->i2cInit = NULL;
	pMga->I2C = NULL;
      }
    }
#endif /* MGAuseI2C */

  /* Map the MGA memory and MMIO areas */
  if (!MGAMapMem(pScrn))
    return NULL;

  /* Initialise the MMIO vgahw functions */
  vgaHWSetMmioFuncs(hwp, pMga->IOBase, PORT_OFFSET);
  vgaHWGetIOBase(hwp);

  /* Map the VGA memory when the primary video */
  if (pMga->Primary) {
    hwp->MapSize = 0x10000;
    if (!vgaHWMapMem(pScrn))
      return NULL;
  } else {
    /* XXX Need to write an MGA mode ddc1SetSpeed */
    if (pMga->DDC1SetSpeed == vgaHWddc1SetSpeed) {
      pMga->DDC1SetSpeed = NULL;
      xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, 2,
		     "DDC1 disabled - chip not in VGA mode\n");
    }
  }

  /* Save the current state */
  MGASave(pScrn);

  /* It is now safe to talk to the card */

#if MGAuseI2C
  /* Initialize I2C bus - used by DDC if available */
  if (pMga->i2cInit) {
    pMga->i2cInit(pScrn);
  }
  /* Read and output monitor info using DDC2 over I2C bus */
  if (pMga->I2C) {
    MonInfo = xf86DoEDID_DDC2(pScrn->scrnIndex,pMga->I2C);
    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "I2C Monitor info: %p\n",
		(void *)MonInfo);
    xf86PrintEDID(MonInfo);
    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "end of I2C Monitor info\n");
  }
  if (!MonInfo)
#endif /* MGAuseI2C */
  /* Read and output monitor info using DDC1 */
  if (pMga->ddc1Read && pMga->DDC1SetSpeed) {
    MonInfo = xf86DoEDID_DDC1(pScrn->scrnIndex,
					 pMga->DDC1SetSpeed,
					 pMga->ddc1Read ) ;
    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "DDC Monitor info: %p\n",
	       (void *)MonInfo);
    xf86PrintEDID( MonInfo );
    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "end of DDC Monitor info\n");
  }
  if (!MonInfo){
    vbeInfoPtr pVbe;
    if (xf86LoadSubModule(pScrn, "vbe")) {
      pVbe = VBEInit(NULL,pMga->pEnt->index);
      MonInfo = vbeDoEDID(pVbe, NULL);
      vbeFree(pVbe);

      if (MonInfo){
	xf86DrvMsg(pScrn->scrnIndex, X_INFO, "VBE DDC Monitor info: %p\n",
		   (void *)MonInfo);
	xf86PrintEDID( MonInfo );
	xf86DrvMsg(pScrn->scrnIndex, X_INFO, "end of VBE DDC Monitor info\n\n");
      }
    }
  }


  /* Restore previous state and unmap MGA memory and MMIO areas */
  MGARestore(pScrn);
  MGAUnmapMem(pScrn);
  /* Unmap vga memory if we mapped it */
  if (xf86IsPrimaryPci(pMga->PciInfo) && !pMga->FBDev) {
    vgaHWUnmapMem(pScrn);
  }

  xf86SetDDCproperties(pScrn, MonInfo);

  return MonInfo;
}

#ifdef DISABLE_VGA_IO
static void
VgaIOSave(int i, void *arg)
{
    MgaSavePtr sMga = arg;
    PCITAG tag = pciTag(sMga->pvp->bus,sMga->pvp->device,sMga->pvp->func);

#ifdef DEBUG
    ErrorF("mga: VgaIOSave: %d:%d:%d\n", sMga->pvp->bus, sMga->pvp->device,
	   sMga->pvp->func);
#endif
    sMga->enable = (pciReadLong(tag, PCI_OPTION_REG) & 0x100) != 0;
}

static void
VgaIORestore(int i, void *arg)
{
    MgaSavePtr sMga = arg;
    PCITAG tag = pciTag(sMga->pvp->bus,sMga->pvp->device,sMga->pvp->func);

#ifdef DEBUG
    ErrorF("mga: VgaIORestore: %d:%d:%d\n", sMga->pvp->bus, sMga->pvp->device,
	   sMga->pvp->func);
#endif
    pciSetBitsLong(tag, PCI_OPTION_REG, 0x100, sMga->enable ? 0x100 : 0x000);
}

static void
VgaIODisable(void *arg)
{
    MGAPtr pMga = arg;

#ifdef DEBUG
    ErrorF("mga: VgaIODisable: %d:%d:%d, %s, xf86ResAccessEnter is %s\n",
	   pMga->PciInfo->bus, pMga->PciInfo->device, pMga->PciInfo->func,
	   pMga->Primary ? "primary" : "secondary",
	   BOOLTOSTRING(xf86ResAccessEnter));
#endif
    /* Turn off the vgaioen bit. */
    pciSetBitsLong(pMga->PciTag, PCI_OPTION_REG, 0x100, 0x000);
}

static void
VgaIOEnable(void *arg)
{
    MGAPtr pMga = arg;

#ifdef DEBUG
    ErrorF("mga: VgaIOEnable: %d:%d:%d, %s, xf86ResAccessEnter is %s\n",
	   pMga->PciInfo->bus, pMga->PciInfo->device, pMga->PciInfo->func,
	   pMga->Primary ? "primary" : "secondary",
	   BOOLTOSTRING(xf86ResAccessEnter));
#endif
    /* Turn on the vgaioen bit. */
    if (pMga->Primary)
	pciSetBitsLong(pMga->PciTag, PCI_OPTION_REG, 0x100, 0x100);
}
#endif /* DISABLE_VGA_IO */

void
MGAProbeDDC(ScrnInfoPtr pScrn, int index)
{
    vbeInfoPtr pVbe;
    if (xf86LoadSubModule(pScrn, "vbe")) {
	pVbe = VBEInit(NULL,index);
	ConfiguredMonitor = vbeDoEDID(pVbe, NULL);
	vbeFree(pVbe); 
    }
}

/* Mandatory */
static Bool
MGAPreInit(ScrnInfoPtr pScrn, int flags)
{
    MGAPtr pMga;
    MessageType from;
    int i;
    double real;
    int bytesPerPixel;
    ClockRangePtr clockRanges;
    const char *s;
    int flags24;
    MGAEntPtr pMgaEnt = NULL;
    Bool Default;
#ifdef USEMGAHAL
    ULONG status;
    CARD8 MiscCtlReg;
#endif

    /*
     * Note: This function is only called once at server startup, and
     * not at the start of each server generation.  This means that
     * only things that are persistent across server generations can
     * be initialised here.  xf86Screens[] is (pScrn is a pointer to one
     * of these).  Privates allocated using xf86AllocateScrnInfoPrivateIndex()
     * are too, and should be used for data that must persist across
     * server generations.
     *
     * Per-generation data should be allocated with
     * AllocateScreenPrivateIndex() from the ScreenInit() function.
     */

    /* Check the number of entities, and fail if it isn't one. */
    if (pScrn->numEntities != 1)
	return FALSE;

    /* Allocate the MGARec driverPrivate */
    if (!MGAGetRec(pScrn)) {
	return FALSE;
    }

    pMga = MGAPTR(pScrn);
    /* Set here until dri is enabled */
#ifdef XF86DRI
    pMga->haveQuiescense = 1;
#endif
    /* Get the entity, and make sure it is PCI. */
    pMga->pEnt = xf86GetEntityInfo(pScrn->entityList[0]);
    if (pMga->pEnt->location.type != BUS_PCI)
	return FALSE;

    /* Allocate an entity private if necessary */
    if (xf86IsEntityShared(pScrn->entityList[0])) {
	pMgaEnt = xf86GetEntityPrivate(pScrn->entityList[0],
					MGAEntityIndex)->ptr;
        pMga->entityPrivate = pMgaEnt;
    }

    /* Set pMga->device to the relevant Device section */
    pMga->device = xf86GetDevFromEntity(pScrn->entityList[0],
					pScrn->entityInstanceList[0]);

    if (flags & PROBE_DETECT) {
	MGAProbeDDC(pScrn, pMga->pEnt->index);
	return TRUE;
    }

    /* The vgahw module should be loaded here when needed */
    if (!xf86LoadSubModule(pScrn, "vgahw"))
	return FALSE;

    xf86LoaderReqSymLists(vgahwSymbols, NULL);

    /*
     * Allocate a vgaHWRec
     */
    if (!vgaHWGetHWRec(pScrn))
	return FALSE;

    /* Find the PCI info for this screen */
    pMga->PciInfo = xf86GetPciInfoForEntity(pMga->pEnt->index);
    pMga->PciTag = pciTag(pMga->PciInfo->bus, pMga->PciInfo->device,
			  pMga->PciInfo->func);

    pMga->Primary = xf86IsPrimaryPci(pMga->PciInfo);

#ifndef DISABLE_VGA_IO
    xf86SetOperatingState(resVgaIo, pMga->pEnt->index, ResUnusedOpr);
    xf86SetOperatingState(resVgaMem, pMga->pEnt->index, ResDisableOpr);
#else
    /*
     * Set our own access functions, which control the vgaioen bit.
     */
    pMga->Access.AccessDisable = VgaIODisable;
    pMga->Access.AccessEnable = VgaIOEnable;
    pMga->Access.arg = pMga;
    xf86SetAccessFuncs(pMga->pEnt, &pMga->Access, &pMga->Access);
#endif

    /* Set pScrn->monitor */
    pScrn->monitor = pScrn->confScreen->monitor;

    /*
     * Set the Chipset and ChipRev, allowing config file entries to
     * override.
     */
    if (pMga->device->chipset && *pMga->device->chipset) {
	pScrn->chipset = pMga->device->chipset;
        pMga->Chipset = xf86StringToToken(MGAChipsets, pScrn->chipset);
        from = X_CONFIG;
    } else if (pMga->device->chipID >= 0) {
	pMga->Chipset = pMga->device->chipID;
	pScrn->chipset = (char *)xf86TokenToString(MGAChipsets, pMga->Chipset);
	from = X_CONFIG;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "ChipID override: 0x%04X\n",
		   pMga->Chipset);
    } else {
	from = X_PROBED;
	pMga->Chipset = pMga->PciInfo->chipType;
	pScrn->chipset = (char *)xf86TokenToString(MGAChipsets, pMga->Chipset);
    }
    if (pMga->device->chipRev >= 0) {
	pMga->ChipRev = pMga->device->chipRev;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "ChipRev override: %d\n",
		   pMga->ChipRev);
    } else {
	pMga->ChipRev = pMga->PciInfo->chipRev;
    }

    /*
     * This shouldn't happen because such problems should be caught in
     * MGAProbe(), but check it just in case.
     */
    if (pScrn->chipset == NULL) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "ChipID 0x%04X is not recognised\n", pMga->Chipset);
	return FALSE;
    }
    if (pMga->Chipset < 0) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "Chipset \"%s\" is not recognised\n", pScrn->chipset);
	return FALSE;
    }

    xf86DrvMsg(pScrn->scrnIndex, from, "Chipset: \"%s\"", pScrn->chipset);
    if (pMga->Chipset == PCI_CHIP_MGAG400) {
	if (pMga->ChipRev >= 0x80) 
	    xf86ErrorF(" (G450)\n");
	else
	    xf86ErrorF(" (G400)\n");
    } else {
	xf86ErrorF("\n");
    }
#ifdef USEMGAHAL
    if (HAL_CHIPSETS) {
	Bool loadHal = TRUE;
	
	from = X_DEFAULT;
	if (xf86FindOption(pMga->device->options, "NoHal")) {
	    loadHal = !xf86SetBoolOption(pMga->device->options,
					 "NoHal", !loadHal);
	    from = X_CONFIG;
	} else if (xf86FindOption(pMga->device->options, "Hal")) {
	    loadHal = xf86SetBoolOption(pMga->device->options,
					"Hal", loadHal);
	    from = X_CONFIG;
	}
        if (loadHal && xf86LoadSubModule(pScrn, "mga_hal")) {
	  xf86LoaderReqSymLists(halSymbols, NULL);
	  xf86DrvMsg(pScrn->scrnIndex, from,"Matrox HAL module used\n");
	  pMga->HALLoaded = TRUE;
	} else {
	  xf86DrvMsg(pScrn->scrnIndex, from, "Matrox HAL module not loaded "
		     "- using builtin mode setup instead\n");
	  pMga->HALLoaded = FALSE;
	}
    }
#endif

    pMga->DualHeadEnabled = FALSE;
    if (xf86IsEntityShared(pScrn->entityList[0])) {/* dual-head mode requested*/
#ifdef USEMGAHAL
	if (pMga->HALLoaded || !MGA_DH_NEEDS_HAL(pMga)) {
#else
	if (!MGA_DH_NEEDS_HAL(pMga)) {
#endif
	    pMga->DualHeadEnabled = TRUE;
	} else if (xf86IsPrimInitDone(pScrn->entityList[0])) {
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
	 "This card requires the \"mga_hal\" module for dual-head operation\n"
	 "\tIt can be found at the Matrox web site <http://www.matrox.com>\n");
	}
    }

    /*
     * In case of DualHead, we need to determine if we are the 'master' head
     * or the 'slave' head. In order to do that, at the end of the first
     * initialisation, PrimInit is set as DONE to the shared entity. So that
     * the second initialisation knows that something has been done before it.
     * This always assume that the first device initialised is the master
     * head, and the second the slave.
     * 
     */
    if (xf86IsEntityShared(pScrn->entityList[0])) {      /* dual-head mode */
        if (!xf86IsPrimInitDone(pScrn->entityList[0])) { /* Is it the first initialisation? */
            /* First CRTC  */
            pMga->SecondCrtc = FALSE;
            pMga->HWCursor = TRUE;
            pMgaEnt->pScrn_1 = pScrn;
        } else if (pMga->DualHeadEnabled) {
            /* Second CRTC */
            pMga->SecondCrtc = TRUE;
            pMga->HWCursor = FALSE;
            pMgaEnt->pScrn_2 = pScrn;
            pScrn->AdjustFrame = MGAAdjustFrameCrtc2;
	    /*
	     * Fail initialization of second head if we are in MergeFB mode,
	     * since we do it ourselfs.
             */
            if(pMgaEnt->pScrn_1 && MGAPTR(pMgaEnt->pScrn_1)->MergedFB) {
		xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
			   "Primary head in Merged framebuffer mode. \n"
			   "Don't let Xfree try to manage the second head.\n"
			   "Remove the second screen in the \"ServerLayout\"\n"
			   "Section of the config file.");
		return FALSE;
	    }
        } else {
	    return FALSE;
	}
    }

    if (pMga->DualHeadEnabled) {
#ifdef XF86DRI
        pMga->GetQuiescence = MGAGetQuiescenceShared;
#endif
    } else {                                              /* single-head mode */
        pMga->SecondCrtc = FALSE;
        pMga->HWCursor = TRUE;
#ifdef XF86DRI
        pMga->GetQuiescence = MGAGetQuiescence;
#endif
    }

   
    
    /*
     * The first thing we should figure out is the depth, bpp, etc.
     * Our default depth is 8, so pass it to the helper function.
     * We support both 24bpp and 32bpp layouts, so indicate that.
     */

    /* Prefer 24bpp fb unless the Overlay option is set, or DRI is
     * supported.
     */
    flags24 = Support24bppFb | Support32bppFb | SupportConvert32to24;
    s = xf86TokenToOptName(MGAOptions, OPTION_OVERLAY);
#ifndef XF86DRI
    if (!(xf86FindOption(pScrn->confScreen->options, s) ||
	  xf86FindOption(pMga->device->options, s))) {
	flags24 |= PreferConvert32to24;
    }
#endif

    if (pMga->SecondCrtc)
	flags24 = Support32bppFb;

    if (!xf86SetDepthBpp(pScrn, 0, 0, 0, flags24)) {
	return FALSE;
    } else {
	/* Check that the returned depth is one we support */
	switch (pScrn->depth) {
	case 8:
	case 15:
	case 16:
	case 24:
	    /* OK */
	    break;
	default:
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		       "Given depth (%d) is not supported by this driver\n",
		       pScrn->depth);
	    return FALSE;
	}
    }
    xf86PrintDepthBpp(pScrn);

    /*
     * This must happen after pScrn->display has been set because
     * xf86SetWeight references it.
     */
    if (pScrn->depth > 8) {
	/* The defaults are OK for us */
	rgb zeros = {0, 0, 0};

	if (!xf86SetWeight(pScrn, zeros, zeros)) {
	    return FALSE;
	} else {
	    /* XXX check that weight returned is supported */
            ;
        }
    }

    bytesPerPixel = pScrn->bitsPerPixel / 8;

    /* We use a programmable clock */
    pScrn->progClock = TRUE;

    /* Collect all of the relevant option flags (fill in pScrn->options) */
    xf86CollectOptions(pScrn, NULL);

    /* Process the options */
    if (!(pMga->Options = xalloc(sizeof(MGAOptions))))
	return FALSE;
    memcpy(pMga->Options, MGAOptions, sizeof(MGAOptions));
    xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, pMga->Options);

    
#if !defined(__powerpc__)
    pMga->softbooted = FALSE;
    if (pMga->Chipset >= PCI_CHIP_MGAG400
	&& !pMga->Primary
	&& !pMga->SecondCrtc)
	Default = TRUE;
    else
	Default = FALSE;
    if (xf86ReturnOptValBool(pMga->Options, OPTION_INT10, Default) &&
        xf86LoadSubModule(pScrn, "int10")) {
        xf86Int10InfoPtr pInt;

	xf86LoaderReqSymLists(int10Symbols, NULL);
        xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Initializing int10\n");
        pInt = xf86InitInt10(pMga->pEnt->index);
	if (pInt) pMga->softbooted = TRUE;
        xf86FreeInt10(pInt);
    }
#endif

    /* Set the bits per RGB for 8bpp mode */
    if (pScrn->depth == 8)
	pScrn->rgbBits = 8;

#ifdef XF86DRI
    from = X_DEFAULT;
    pMga->agpMode = MGA_DEFAULT_AGP_MODE;

    if (xf86GetOptValInteger(pMga->Options,
			     OPTION_AGP_MODE, &(pMga->agpMode))) {
       if (pMga->agpMode < 1) {
	  pMga->agpMode = 1;
       }
       if (pMga->agpMode > MGA_MAX_AGP_MODE) {
	  pMga->agpMode = MGA_MAX_AGP_MODE;
       }
       from = X_CONFIG;
    }
    if (xf86GetOptValInteger(pMga->Options,
                             OPTION_AGP_SIZE, &(pMga->agpSize))) {
                             /* check later */
       xf86DrvMsg(pScrn->scrnIndex, from, "Using %d MB of AGP memory\n",
	          pMga->agpSize);
    }

    xf86DrvMsg(pScrn->scrnIndex, from, "Using AGP %dx mode\n",
	       pMga->agpMode);
#endif

    from = X_DEFAULT;

    /*
     * The preferred method is to use the "hw cursor" option as a tri-state
     * option, with the default set above.
     */
    if (xf86GetOptValBool(pMga->Options, OPTION_HW_CURSOR, &pMga->HWCursor)) {
	from = X_CONFIG;
    }

    /* For compatibility, accept this too (as an override) */
    if (xf86ReturnOptValBool(pMga->Options, OPTION_NOACCEL, FALSE)) {
	pMga->NoAccel = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Acceleration disabled\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_PCI_RETRY, FALSE)) {
	pMga->UsePCIRetry = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "PCI retry enabled\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_SYNC_ON_GREEN, FALSE)) {
	pMga->SyncOnGreen = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Sync-on-Green enabled\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_SHOWCACHE, FALSE)) {
	pMga->ShowCache = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "ShowCache enabled\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_MGA_SDRAM, FALSE)) {
	pMga->HasSDRAM = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Has SDRAM\n");
    }
    if (xf86GetOptValFreq(pMga->Options, OPTION_SET_MCLK, OPTUNITS_MHZ, &real)) {
	pMga->MemClk = (int)(real * 1000.0);
    }
    if ((s = xf86GetOptValString(pMga->Options, OPTION_OVERLAY))) {
      if (!*s || !xf86NameCmp(s, "8,24") || !xf86NameCmp(s, "24,8")) {
	if(pScrn->bitsPerPixel == 32 && pMga->SecondCrtc == FALSE) {
	    pMga->Overlay8Plus24 = TRUE;
	    if(!xf86GetOptValInteger(
			pMga->Options, OPTION_COLOR_KEY,&(pMga->colorKey)))
		pMga->colorKey = TRANSPARENCY_KEY;
	    pScrn->colorKey = pMga->colorKey;
	    pScrn->overlayFlags = OVERLAY_8_32_PLANAR;
	    xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
				"PseudoColor overlay enabled\n");
	} else {
	    xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
	         "Option \"Overlay\" is only supported in 32 bits per pixel on"
		 "the first CRTC\n");
	}
      } else {
	  xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
		"\"%s\" is not a valid value for Option \"Overlay\"\n", s);
      }
    }

    if(xf86GetOptValInteger(pMga->Options, OPTION_VIDEO_KEY, &(pMga->videoKey))) {
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "video key set to 0x%x\n",
				pMga->videoKey);
    } else {
	pMga->videoKey =  (1 << pScrn->offset.red) |
			  (1 << pScrn->offset.green) |
        (((pScrn->mask.blue >> pScrn->offset.blue) - 1) << pScrn->offset.blue);
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_SHADOW_FB, FALSE)) {
	pMga->ShadowFB = TRUE;
	pMga->NoAccel = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
		"Using \"Shadow Framebuffer\" - acceleration disabled\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_FBDEV, FALSE)) {
	pMga->FBDev = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
		"Using framebuffer device\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_OVERCLOCK_MEM, FALSE)) {
	pMga->OverclockMem = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Overclocking memory\n");
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_TEXTURED_VIDEO, FALSE)) {
	pMga->TexturedVideo = TRUE;
    }
    if (xf86ReturnOptValBool(pMga->Options, OPTION_MERGEDFB, FALSE)) {
        if(!MGAISGx50(pMga)) {
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                "\"Merged Framebuffer\" mode only supported on G450 and G550 boards.\n");
        } else { 
#ifdef USEMGAHAL
            if(pMga->HALLoaded)
            { 
                pMga->MergedFB = TRUE;
                xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
                        "Using \"Merged Framebuffer\" mode.\n");
                /*
                * a few options that won't work well together
                */
                if(pMga->HWCursor) /*Should we give the choice? */
                    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                        " -- Hardware Cursor disabled.\n");
                pMga->HWCursor = FALSE; 
                if(pMga->ShadowFB) 
                    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                        " -- Shadow Framebuffer disabled.\n");
                pMga->ShadowFB = FALSE;
                if(pMga->FBDev) 
                    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                        " -- Framebuffer device disabled.\n");
                pMga->FBDev = FALSE;
            } /* MGA_HAL */
            else
#endif
            { 
                xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                    "HALLib not loaded! NOT using \"Merged Framebuffer\" mode.\n");
            } /* MGA_NOT_HAL */
        } /* ISMGAGx50() */
    }
    if (pMga->FBDev) {
	/* check for linux framebuffer device */
	if (!xf86LoadSubModule(pScrn, "fbdevhw"))
	    return FALSE;
	xf86LoaderReqSymLists(fbdevHWSymbols, NULL);
	if (!fbdevHWInit(pScrn, pMga->PciInfo, NULL))
	    return FALSE;
	pScrn->SwitchMode    = fbdevHWSwitchMode;
	pScrn->AdjustFrame   = fbdevHWAdjustFrame;
	pScrn->EnterVT       = MGAEnterVTFBDev;
	pScrn->LeaveVT       = fbdevHWLeaveVT;
	pScrn->ValidMode     = fbdevHWValidMode;
    }
    pMga->Rotate = 0;
    if ((s = xf86GetOptValString(pMga->Options, OPTION_ROTATE))) {
        if(!pMga->MergedFB) {
            if(!xf86NameCmp(s, "CW")) {
                pMga->ShadowFB = TRUE;
                pMga->NoAccel = TRUE;
                pMga->HWCursor = FALSE;
                pMga->Rotate = 1;
                xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
                        "Rotating screen clockwise - acceleration disabled\n");
            } else
            if(!xf86NameCmp(s, "CCW")) {
                pMga->ShadowFB = TRUE;
                pMga->NoAccel = TRUE;
                pMga->HWCursor = FALSE;
                pMga->Rotate = -1;
                xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
                        "Rotating screen counter clockwise - acceleration disabled\n");
            } else {
                xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
                        "\"%s\" is not a valid value for Option \"Rotate\"\n", s);
                xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                        "Valid options are \"CW\" or \"CCW\"\n");
            }
        } else {
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                " -- Rotation disabled.\n");
        }
    }

    switch (pMga->Chipset) {
    case PCI_CHIP_MGA2064:
    case PCI_CHIP_MGA2164:
    case PCI_CHIP_MGA2164_AGP:
	MGA2064SetupFuncs(pScrn);
	break;
    case PCI_CHIP_MGA1064:
    case PCI_CHIP_MGAG100:
    case PCI_CHIP_MGAG100_PCI:
    case PCI_CHIP_MGAG200:
    case PCI_CHIP_MGAG200_PCI:
    case PCI_CHIP_MGAG400:
    case PCI_CHIP_MGAG550:
	MGAGSetupFuncs(pScrn);
	break;
    }

    /* ajv changes to reflect actual values. see sdk pp 3-2. */
    /* these masks just get rid of the crap in the lower bits */

    /*
     * For the 2064 and older rev 1064, base0 is the MMIO and base0 is
     * the framebuffer is base1.  Let the config file override these.
     */
    if (pMga->device->MemBase != 0) {
	/* Require that the config file value matches one of the PCI values. */
	if (!xf86CheckPciMemBase(pMga->PciInfo, pMga->device->MemBase)) {
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		"MemBase 0x%08lX doesn't match any PCI base register.\n",
		pMga->device->MemBase);
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	pMga->FbAddress = pMga->device->MemBase;
	from = X_CONFIG;
    } else {
	/* details: mgabase2 sdk pp 4-12 */
	int i = ((pMga->Chipset == PCI_CHIP_MGA1064 && pMga->ChipRev < 3) ||
		    pMga->Chipset == PCI_CHIP_MGA2064) ? 1 : 0;
	pMga->FbBaseReg = i;
	if (pMga->PciInfo->memBase[i] != 0) {
	    pMga->FbAddress = pMga->PciInfo->memBase[i] & 0xff800000;
	    from = X_PROBED;
	} else {
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
			   "No valid FB address in PCI config space\n");
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
    }

    xf86DrvMsg(pScrn->scrnIndex, from, "Linear framebuffer at 0x%lX\n",
	       (unsigned long)pMga->FbAddress);

#if !defined(__powerpc__)
    if (pMga->device->IOBase != 0) {
	/* Require that the config file value matches one of the PCI values. */
	if (!xf86CheckPciMemBase(pMga->PciInfo, pMga->device->IOBase)) {
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		"IOBase 0x%08lX doesn't match any PCI base register.\n",
		pMga->device->IOBase);
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	pMga->IOAddress = pMga->device->IOBase;
	from = X_CONFIG;
    } else
#endif
    {
	/* details: mgabase1 sdk pp 4-11 */
	int i = ((pMga->Chipset == PCI_CHIP_MGA1064 && pMga->ChipRev < 3) ||
		    pMga->Chipset == PCI_CHIP_MGA2064) ? 0 : 1;
	if (pMga->PciInfo->memBase[i] != 0) {
	    pMga->IOAddress = pMga->PciInfo->memBase[i] & 0xffffc000;
	    from = X_PROBED;
	} else {
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
			"No valid MMIO address in PCI config space\n");
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
    }
    xf86DrvMsg(pScrn->scrnIndex, from, "MMIO registers at 0x%lX\n",
	       (unsigned long)pMga->IOAddress);


    pMga->ILOADAddress = 0;
    if ( pMga->Chipset != PCI_CHIP_MGA2064 ) {
	    if (pMga->PciInfo->memBase[2] != 0) {
	    	pMga->ILOADAddress = pMga->PciInfo->memBase[2] & 0xffffc000;
	        xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
			"Pseudo-DMA transfer window at 0x%lX\n",
	       		(unsigned long)pMga->ILOADAddress);
	    }
    }

#if !defined(__powerpc__)
    /*
     * Find the BIOS base.  Get it from the PCI config if possible.  Otherwise
     * use the VGA default.  Allow the config file to override this.
     */

    pMga->BiosFrom = X_NONE;
    if (pMga->device->BiosBase != 0) {
	/* XXX This isn't used */
	pMga->BiosAddress = pMga->device->BiosBase;
	pMga->BiosFrom = X_CONFIG;
    } else {
	/* details: rombase sdk pp 4-15 */
	if (pMga->PciInfo->biosBase != 0) {
	    pMga->BiosAddress = pMga->PciInfo->biosBase & 0xffff0000;
	    pMga->BiosFrom = X_PROBED;
	} else if (pMga->Primary) {
	    pMga->BiosAddress = 0xc0000;
	    pMga->BiosFrom = X_DEFAULT;
	}
    }
    if (pMga->BiosAddress) {
	xf86DrvMsg(pScrn->scrnIndex, pMga->BiosFrom, "BIOS at 0x%lX\n",
		   (unsigned long)pMga->BiosAddress);
    }

    if (xf86RegisterResources(pMga->pEnt->index, NULL, ResExclusive)) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		"xf86RegisterResources() found resource conflicts\n");
	MGAFreeRec(pScrn);
	return FALSE;
    }

    /*
     * Read the BIOS data struct
     */

#if defined(__alpha__)
    /* 
     * Some old Digital-OEMed Matrox Millennium I cards have a VGA
     * disable switch.  If the disable is on, we can't read the BIOS,
     * and pMga->BiosAddress = 0x0. The disable switch is needed to
     * allow multi-head operation with brain-dead console code... ;-}
     */
    
    if ((pMga->BiosAddress == 0) && !xf86IsPrimaryPci(pMga->PciInfo))
        xf86DrvMsg(pScrn->scrnIndex, pMga->BiosFrom,
                   "BIOS not found, skipping read\n");
    else
#endif
    MGAReadBios(pScrn);

    /* Since the BIOS can swap DACs during the initialisation of G550, we need to
     * store which DAC this instance of the driver is taking care of. This is done
     * by checking a flag stored in the ROM by the BIOS at a fixed address. */

    if (!pMga->SecondCrtc) 
        pMga->SecondOutput = FALSE;
    else
        pMga->SecondOutput = TRUE;

    if (pMga->Chipset == PCI_CHIP_MGAG550) {
        if (!pMga->SecondCrtc) {
            pMga->SecondOutput = (pMga->BiosOutputMode & 0x1) ? TRUE : FALSE;
        } else {
            pMga->SecondOutput = (pMga->BiosOutputMode & 0x1) ? FALSE : TRUE;
        }
    }

    xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, 2,
		   "MGABios.RamdacType = 0x%x\n", pMga->Bios.RamdacType);
#endif /* !__powerpc__ */

    /* HW bpp matches reported bpp */
    pMga->HwBpp = pScrn->bitsPerPixel;

    /*
     * Reset card if it isn't primary one
     */
    if ( (!pMga->Primary && !pMga->FBDev) || xf86IsPc98() )
        MGASoftReset(pScrn);

    /*
     * If the user has specified the amount of memory in the XF86Config
     * file, we respect that setting.
     */
    from = X_PROBED;
    if (pMga->device->videoRam != 0) {
	pScrn->videoRam = pMga->device->videoRam;
	from = X_CONFIG;
    } else if (pMga->FBDev) {
	pScrn->videoRam = fbdevHWGetVidmem(pScrn)/1024;
    } else {
	pScrn->videoRam = MGACountRam(pScrn);
    }

    if (pMga->DualHeadEnabled) {
       /* This takes gives either half or 8 meg to the second head
	* whichever is less. */
        if(pMga->SecondCrtc == FALSE) {
	    Bool UseHalf = FALSE;
	    int adjust;

	    xf86GetOptValBool(pMga->Options, OPTION_CRTC2HALF, &UseHalf);
	    adjust = pScrn->videoRam / 2;

	    if (UseHalf == TRUE ||
		  xf86GetOptValInteger(pMga->Options, OPTION_CRTC2RAM, &adjust)) {
	        xf86DrvMsg(pScrn->scrnIndex, X_CONFIG,
			   "Crtc2 will use %dK of VideoRam\n",
			   adjust);
	    } else {
	        adjust = min(adjust, 8192);
	        xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
			   "Crtc2 will use %dK of VideoRam\n",
			   adjust);
	    }
	    pMgaEnt->mastervideoRam = pScrn->videoRam - adjust;
	    pScrn->videoRam = pMgaEnt->mastervideoRam;
	    pMgaEnt->slavevideoRam = adjust;
	    pMgaEnt->masterFbAddress = pMga->FbAddress;
	    pMga->FbMapSize =
	       pMgaEnt->masterFbMapSize = pScrn->videoRam * 1024;
	    pMgaEnt->slaveFbAddress = pMga->FbAddress + 
	       pMgaEnt->masterFbMapSize;
	    pMgaEnt->slaveFbMapSize = pMgaEnt->slavevideoRam * 1024;
	    pMga->realSrcOrg = pMga->SrcOrg = 0;
	    pMga->DstOrg = 0;
	} else {
	    pMga->FbAddress = pMgaEnt->slaveFbAddress;
	    pMga->FbMapSize = pMgaEnt->slaveFbMapSize;
	    pScrn->videoRam = pMgaEnt->slavevideoRam;
	    pMga->DstOrg = pMga->realSrcOrg =
	      pMgaEnt->slaveFbAddress - pMgaEnt->masterFbAddress;
	    pMga->SrcOrg = 0; /* This is not stored in hw format!! */
	}
        pMgaEnt->refCount++;
    } else {
        /* Normal Handling of video ram etc */
        pMga->FbMapSize = pScrn->videoRam * 1024;
        switch(pMga->Chipset) {
	  case PCI_CHIP_MGAG550:
	  case PCI_CHIP_MGAG400:
	  case PCI_CHIP_MGAG200:
	  case PCI_CHIP_MGAG200_PCI:
	    pMga->SrcOrg = 0;
	    pMga->DstOrg = 0;
	    break;
	  default:
	    break;
	}
    }
    xf86DrvMsg(pScrn->scrnIndex, from, "VideoRAM: %d kByte\n",
               pScrn->videoRam);

   /* Set the bpp shift value */
    pMga->BppShifts[0] = 0;
    pMga->BppShifts[1] = 1;
    pMga->BppShifts[2] = 0;
    pMga->BppShifts[3] = 2;

    /*
     * fill MGAdac struct
     * Warning: currently, it should be after RAM counting
     */
    (*pMga->PreInit)(pScrn);

#if !defined(__powerpc__)

    /* Read and print the Monitor DDC info */
    pScrn->monitor->DDC = MGAdoDDC(pScrn);
#endif /* !__powerpc__ */

    /*
     * If the driver can do gamma correction, it should call xf86SetGamma()
     * here.
     */

    {
	Gamma zeros = {0.0, 0.0, 0.0};

	if (!xf86SetGamma(pScrn, zeros)) {
	    return FALSE;
	}
    }


    /* XXX Set HW cursor use */

    /* Set the min pixel clock */
    pMga->MinClock = 12000;	/* XXX Guess, need to check this */
    xf86DrvMsg(pScrn->scrnIndex, X_DEFAULT, "Min pixel clock is %d MHz\n",
	       pMga->MinClock / 1000);
    /*
     * If the user has specified ramdac speed in the XF86Config
     * file, we respect that setting.
     */
    if (pMga->device->dacSpeeds[0]) {
	int speed = 0;

	switch (pScrn->bitsPerPixel) {
	case 8:
	   speed = pMga->device->dacSpeeds[DAC_BPP8];
	   break;
	case 16:
	   speed = pMga->device->dacSpeeds[DAC_BPP16];
	   break;
	case 24:
	   speed = pMga->device->dacSpeeds[DAC_BPP24];
	   break;
	case 32:
	   speed = pMga->device->dacSpeeds[DAC_BPP32];
	   break;
	}
	if (speed == 0)
	    pMga->MaxClock = pMga->device->dacSpeeds[0];
	else
	    pMga->MaxClock = speed;
	from = X_CONFIG;
    } else {
	pMga->MaxClock = pMga->Dac.maxPixelClock;
	from = pMga->Dac.ClockFrom;
    }
    if(pMga->SecondCrtc == TRUE) {
        /* Override on 2nd crtc */
	if ((pMga->ChipRev >= 0x80) || (pMga->Chipset == PCI_CHIP_MGAG550)) {
	    /* G450, G550 */
	    pMga->MaxClock = 234000;
	} else {
	    pMga->MaxClock = 135000;
	}
    }
    xf86DrvMsg(pScrn->scrnIndex, from, "Max pixel clock is %d MHz\n",
	       pMga->MaxClock / 1000);
    /*
     * Setup the ClockRanges, which describe what clock ranges are available,
     * and what sort of modes they can be used for.
     */
    clockRanges = xnfcalloc(sizeof(ClockRange), 1);
    clockRanges->next = NULL;
    clockRanges->minClock = pMga->MinClock;
    clockRanges->maxClock = pMga->MaxClock;
    clockRanges->clockIndex = -1;		/* programmable */
    clockRanges->interlaceAllowed = TRUE;
    clockRanges->doubleScanAllowed = TRUE;
#ifdef USEMGAHAL
    MGA_HAL(clockRanges->interlaceAllowed = FALSE);
    MGA_HAL(clockRanges->doubleScanAllowed = FALSE);
#endif
    if (pMga->SecondCrtc == TRUE) 
	clockRanges->interlaceAllowed = FALSE;

    clockRanges->ClockMulFactor = 1;
    clockRanges->ClockDivFactor = 1;

    /* Only set MemClk if appropriate for the ramdac */
    if (pMga->Dac.SetMemClk) {
	if (pMga->MemClk == 0) {
	    pMga->MemClk = pMga->Dac.MemoryClock;
	    from = pMga->Dac.MemClkFrom;
	} else
	    from = X_CONFIG;
	xf86DrvMsg(pScrn->scrnIndex, from, "MCLK used is %.1f MHz\n",
		   pMga->MemClk / 1000.0);
    }

    /*
     * xf86ValidateModes will check that the mode HTotal and VTotal values
     * don't exceed the chipset's limit if pScrn->maxHValue and
     * pScrn->maxVValue are set.  Since our MGAValidMode() already takes
     * care of this, we don't worry about setting them here.
     */
    {
	int Pitches1[] =
	  {640, 768, 800, 960, 1024, 1152, 1280, 1600, 1920, 2048, 0};
	int Pitches2[] =
	  {512, 640, 768, 800, 832, 960, 1024, 1152, 1280, 1600, 1664,
		1920, 2048, 0};
	int *linePitches = NULL;
	int minPitch = 256;
	int maxPitch = 2048;

        switch(pMga->Chipset) {
	case PCI_CHIP_MGA2064:
	   if (!pMga->NoAccel) {
		linePitches = xalloc(sizeof(Pitches1));
		memcpy(linePitches, Pitches1, sizeof(Pitches1));
		minPitch = maxPitch = 0;
	   }
	   break;
	case PCI_CHIP_MGA2164:
	case PCI_CHIP_MGA2164_AGP:
	case PCI_CHIP_MGA1064:
	   if (!pMga->NoAccel) {
		linePitches = xalloc(sizeof(Pitches2));
		memcpy(linePitches, Pitches2, sizeof(Pitches2));
		minPitch = maxPitch = 0;
	   }
	   break;
	case PCI_CHIP_MGAG100:
	case PCI_CHIP_MGAG100_PCI:
	   maxPitch = 2048;
	   break;
	case PCI_CHIP_MGAG200:
	case PCI_CHIP_MGAG200_PCI:
	case PCI_CHIP_MGAG400:
	case PCI_CHIP_MGAG550:
	   maxPitch = 4096;
	   break;
	}

	i = xf86ValidateModes(pScrn, pScrn->monitor->Modes,
			      pScrn->display->modes, clockRanges,
			      linePitches, minPitch, maxPitch,
			      pMga->Roundings[(pScrn->bitsPerPixel >> 3) - 1] *
					pScrn->bitsPerPixel, 128, 2048,
			      pScrn->display->virtualX,
			      pScrn->display->virtualY,
			      pMga->FbMapSize,
			      LOOKUP_BEST_REFRESH);
      
	if (linePitches)
	   xfree(linePitches);
    }


    if (i < 1 && pMga->FBDev) {
	fbdevHWUseBuildinMode(pScrn);
	pScrn->displayWidth = pScrn->virtualX; /* FIXME: might be wrong */
	i = 1;
    }
    if (i == -1) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Validate Modes Failed\n");
	MGAFreeRec(pScrn);
	return FALSE;
    }

    /* Prune the modes marked as invalid */
    xf86PruneDriverModes(pScrn);

    if (i == 0 || pScrn->modes == NULL) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "No valid modes found\n");
	MGAFreeRec(pScrn);
	return FALSE;
    }
#ifdef USEMGAHAL
    MGA_HAL(

    if(pMga->SecondCrtc == FALSE) {
	
        pMga->pBoard = xalloc(sizeof(CLIENTDATA) + MGAGetBOARDHANDLESize());
        pMga->pClientStruct = xalloc(sizeof(CLIENTDATA));
        pMga->pClientStruct->pMga = (MGAPtr) pMga;

        MGAMapMem(pScrn);
	/* 
	 * For some reason the MGAOPM_DMA_BLIT bit needs to be set
	 * on G200 before opening the HALlib. I don't know why.
	 * MATROX: hint, hint.
	 */
	/*if (pMga->Chipset == PCI_CHIP_MGAG200 ||
	  pMga->Chipset == PCI_CHIP_MGAG200_PCI) */{
	    CARD32 opmode;
	    opmode = INREG(MGAREG_OPMODE);
	    OUTREG(MGAREG_OPMODE,  MGAOPM_DMA_BLIT | opmode);
	}
	/* wrapping OpenLibrary to fix broken registers. MATROX: hint, hint. */
	MiscCtlReg = inMGAdac(MGA1064_MISC_CTL);
        MGAOpenLibrary(pMga->pBoard,pMga->pClientStruct,sizeof(CLIENTDATA));
	outMGAdac(MGA1064_MISC_CTL,MiscCtlReg);
        MGAUnmapMem(pScrn);
        pMga->pMgaHwInfo = xalloc(sizeof(MGAHWINFO));
        MGAGetHardwareInfo(pMga->pBoard,pMga->pMgaHwInfo);

        /* copy the board handles */
        if (pMga->DualHeadEnabled) {
            pMgaEnt->pClientStruct = pMga->pClientStruct;
            pMgaEnt->pBoard = pMga->pBoard;
            pMgaEnt->pMgaHwInfo = pMga->pMgaHwInfo;
        }

    } else { /* Second CRTC && entity is shared */ 
        pMga->pBoard = pMgaEnt->pBoard;
        pMga->pClientStruct = pMgaEnt->pClientStruct;
        pMga->pMgaHwInfo = pMgaEnt->pMgaHwInfo;

    }

    MGAFillModeInfoStruct(pScrn,NULL);
    /* Fields usually handled by MGAFillModeInfoStruct, but are unavailable
     * because no mode is given
     */
    pMga->pMgaModeInfo->ulDispWidth = pScrn->virtualX;
    pMga->pMgaModeInfo->ulDispHeight = pScrn->virtualY;

    
    if (ISDIGITAL1(pMga)) 
        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                    "Digital screen detected on first head.\n");
    if (ISTV1(pMga)) 
        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                    "TV detected on first head.\n");
    if (ISDIGITAL2(pMga)) 
        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                    "Digital screen detected on second head.\n");
    if (ISTV2(pMga))
        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                    "TV detected on second head.\n");

    
    if((status = MGAValidateMode(pMga->pBoard,pMga->pMgaModeInfo)) != 0) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "MGAValidateMode from HALlib found the mode to be invalid.\n"
		   "\tError: 0x%lx\n", status);
        return FALSE;
    }
    pScrn->displayWidth = pMga->pMgaModeInfo->ulFBPitch;
    );	/* MGA_HAL */
#endif

    if (pMga->HasSDRAM) { /* don't bother checking */ }
    else if ((pMga->PciInfo->subsysCard == PCI_CARD_MILL_G200_SD) ||
	(pMga->PciInfo->subsysCard == PCI_CARD_MARV_G200_SD) ||
	(pMga->PciInfo->subsysCard == PCI_CARD_MYST_G200_SD) ||
	(pMga->PciInfo->subsysCard == PCI_CARD_PROD_G100_SD)) {
        pMga->HasSDRAM = TRUE;
	xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "Has SDRAM\n");
    }
    /*
     * Can we trust HALlib to set the memory configuration
     * registers correctly?
     */
#ifdef USEMGAHAL
    else if ((pMga->softbooted || pMga->Primary /*|| pMga->HALLoaded*/ ) &&
#else
    else if ((pMga->softbooted || pMga->Primary) &&
#endif
	     (pMga->Chipset != PCI_CHIP_MGA2064) &&
	     (pMga->Chipset != PCI_CHIP_MGA2164) &&
	     (pMga->Chipset != PCI_CHIP_MGA2164_AGP)) {
        CARD32 option_reg = pciReadLong(pMga->PciTag, PCI_OPTION_REG);
	if(!(option_reg & (1 << 14))) {
	    pMga->HasSDRAM = TRUE;
	    xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "Has SDRAM\n");
	}
    }

    /*
     * Set the CRTC parameters for all of the modes based on the type
     * of mode, and the chipset's interlace requirements.
     *
     * Calling this is required if the mode->Crtc* values are used by the
     * driver and if the driver doesn't provide code to set them.  They
     * are not pre-initialised at all.
     */
#ifdef USEMGAHAL
    MGA_HAL(xf86SetCrtcForModes(pScrn, 0));
#endif
    MGA_NOT_HAL(xf86SetCrtcForModes(pScrn, INTERLACE_HALVE_V));

    /* Set the current mode to the first in the list */
    pScrn->currentMode = pScrn->modes;

    /* Print the list of modes being used */
    xf86PrintModes(pScrn);

    /* Set display resolution */
    xf86SetDpi(pScrn, 0, 0);

    /*
     * Compute the byte offset into the linear frame buffer where the
     * frame buffer data should actually begin.  According to DDK misc.c
     * line 1023, if more than 4MB is to be displayed, YDSTORG must be set
     * appropriately to align memory bank switching, and this requires a
     * corresponding offset on linear frame buffer access.
     * This is only needed for WRAM.
     */

    pMga->YDstOrg = 0;
    if (((pMga->Chipset == PCI_CHIP_MGA2064) ||
	 (pMga->Chipset == PCI_CHIP_MGA2164) ||
	 (pMga->Chipset == PCI_CHIP_MGA2164_AGP)) &&
	(pScrn->virtualX * pScrn->virtualY * bytesPerPixel > 4*1024*1024))
    {
	int offset, offset_modulo, ydstorg_modulo;

	offset = (4*1024*1024) % (pScrn->displayWidth * bytesPerPixel);
	offset_modulo = 4;
	ydstorg_modulo = 64;
	if (pScrn->bitsPerPixel == 24)
	    offset_modulo *= 3;
	if (pMga->Interleave)
	{
	    offset_modulo <<= 1;
	    ydstorg_modulo <<= 1;
	}
	pMga->YDstOrg = offset / bytesPerPixel;

	/*
	 * When this was unconditional, it caused a line of horizontal garbage
	 * at the middle right of the screen at the 4Meg boundary in 32bpp
	 * (and presumably any other modes that use more than 4M). But it's
	 * essential for 24bpp (it may not matter either way for 8bpp & 16bpp,
	 * I'm not sure; I didn't notice problems when I checked with and
	 * without.)
	 * DRM Doug Merritt 12/97, submitted to XFree86 6/98 (oops)
	 */
	if (bytesPerPixel < 4) {
	    while ((offset % offset_modulo) != 0 ||
		   (pMga->YDstOrg % ydstorg_modulo) != 0) {
		offset++;
		pMga->YDstOrg = offset / bytesPerPixel;
	    }
	}
    }

    xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, 2, "YDstOrg is set to %d\n",
		   pMga->YDstOrg);
    if(pMga->DualHeadEnabled) {
        if(pMga->SecondCrtc == FALSE) {
	    pMga->FbUsableSize = pMgaEnt->masterFbMapSize;
            /* Allocate HW cursor buffer at the end of video ram */
	    if( pMga->HWCursor && pMga->Dac.CursorOffscreenMemSize ) {
	        if( pScrn->virtualY * pScrn->displayWidth *
		    pScrn->bitsPerPixel / 8 <=
		    pMga->FbUsableSize - pMga->Dac.CursorOffscreenMemSize ) {
		    pMga->FbUsableSize -= pMga->Dac.CursorOffscreenMemSize;
		    pMga->FbCursorOffset =
		      pMgaEnt->masterFbMapSize -
		      pMga->Dac.CursorOffscreenMemSize;
		} else {
		    pMga->HWCursor = FALSE;
		    xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
			       "Too little offscreen memory for HW cursor; "
			       "using SW cursor\n");
		}
	    }
	} else { /* Second CRTC */
	    pMga->FbUsableSize = pMgaEnt->slaveFbMapSize;
	    pMga->HWCursor = FALSE;
	}
    } else { 
        pMga->FbUsableSize = pMga->FbMapSize - pMga->YDstOrg * bytesPerPixel;
           /* Allocate HW cursor buffer at the end of video ram */
        if( pMga->HWCursor && pMga->Dac.CursorOffscreenMemSize ) {
	    if( pScrn->virtualY * pScrn->displayWidth *
	        pScrn->bitsPerPixel / 8 <=
        	pMga->FbUsableSize - pMga->Dac.CursorOffscreenMemSize ) {
	        pMga->FbUsableSize -= pMga->Dac.CursorOffscreenMemSize;
	        pMga->FbCursorOffset =
		  pMga->FbMapSize - pMga->Dac.CursorOffscreenMemSize;
	    } else {
	        pMga->HWCursor = FALSE;
	        xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
			   "Too little offscreen memory for HW cursor; "
			   "using SW cursor\n");
	    }
	}
    }
    /*
     * XXX This should be taken into account in some way in the mode valdation
     * section.
     */


    /* Load the required framebuffer */
    if (pMga->Overlay8Plus24) {
	if (!xf86LoadSubModule(pScrn, "xf8_32bpp")) {
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	xf86LoaderReqSymLists(xf8_32bppSymbols, NULL);
    } else {
	if (!xf86LoadSubModule(pScrn, "fb")) {
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	xf86LoaderReqSymLists(fbSymbols, NULL);
    }


    /* Load XAA if needed */
    if (!pMga->NoAccel) {
	if (!xf86LoadSubModule(pScrn, "xaa")) {
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	xf86LoaderReqSymLists(xaaSymbols, NULL);
    }

    /* Load ramdac if needed */
    if (pMga->HWCursor) {
	if (!xf86LoadSubModule(pScrn, "ramdac")) {
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	xf86LoaderReqSymLists(ramdacSymbols, NULL);
    }

    /* Load shadowfb if needed */
    if (pMga->ShadowFB) {
	if (!xf86LoadSubModule(pScrn, "shadowfb")) {
	    MGAFreeRec(pScrn);
	    return FALSE;
	}
	xf86LoaderReqSymLists(shadowSymbols, NULL);
    }

#ifdef XF86DRI
    /* Load the dri module if requested. */
    if (xf86ReturnOptValBool(pMga->Options, OPTION_DRI, FALSE)) {
       if (xf86LoadSubModule(pScrn, "dri")) {
	  xf86LoaderReqSymLists(driSymbols, drmSymbols, NULL);
       }
    }
#endif
    pMga->CurrentLayout.bitsPerPixel = pScrn->bitsPerPixel;
    pMga->CurrentLayout.depth = pScrn->depth;
    pMga->CurrentLayout.displayWidth = pScrn->displayWidth;
    pMga->CurrentLayout.weight.red = pScrn->weight.red;
    pMga->CurrentLayout.weight.green = pScrn->weight.green;
    pMga->CurrentLayout.weight.blue = pScrn->weight.blue;
    pMga->CurrentLayout.Overlay8Plus24 = pMga->Overlay8Plus24;
    pMga->CurrentLayout.mode = pScrn->currentMode;
	

    
    if(pMga->MergedFB) {
        MGAPreInitMergedFB(pScrn,flags);
    };

    
#ifdef USEMGAHAL
    MGA_HAL(
    /* Close the library after preinit */
    /* This needs to only happen after this board has completed preinit
     * both times
     */

      if(pMga->DualHeadEnabled) {
	  /* Entity is shared make sure refcount == 2 */
	  /* If ref count is 2 then reset it to 0 */
	  if(pMgaEnt->refCount == 2) {
	      /* Both boards have done there initialization */
	      MGACloseLibrary(pMga->pBoard);

	      if (pMga->pBoard)
	        xfree(pMga->pBoard);
	      if (pMga->pClientStruct)
	        xfree(pMga->pClientStruct);
	      if (pMga->pMgaModeInfo)
	        xfree(pMga->pMgaModeInfo);
	      if (pMga->pMgaHwInfo)
	        xfree(pMga->pMgaHwInfo);
	      pMgaEnt->refCount = 0;
	  }
      } else {
	  MGACloseLibrary(pMga->pBoard);

	  if (pMga->pBoard)
	    xfree(pMga->pBoard);
	  if (pMga->pClientStruct)
	    xfree(pMga->pClientStruct);
	  if (pMga->pMgaModeInfo)
	    xfree(pMga->pMgaModeInfo);
	  if (pMga->pMgaHwInfo)
	    xfree(pMga->pMgaHwInfo);
      }

    );	/* MGA_HAL */
#endif

    xf86SetPrimInitDone(pScrn->entityList[0]);
    
    return TRUE;
}


/*
 * Map the framebuffer and MMIO memory.
 */

static Bool
MGAMapMem(ScrnInfoPtr pScrn)
{
    MGAPtr pMga;

    pMga = MGAPTR(pScrn);

    /*
     * Map IO registers to virtual address space
     */
    /*
     * For Alpha, we need to map SPARSE memory, since we need
     * byte/short access.  This is taken care of automatically by the
     * os-support layer.
     */
    pMga->IOBase = xf86MapPciMem(pScrn->scrnIndex,
				 VIDMEM_MMIO | VIDMEM_READSIDEEFFECT,
				 pMga->PciTag, pMga->IOAddress, 0x4000);
    if (pMga->IOBase == NULL)
	return FALSE;

    pMga->FbBase = xf86MapPciMem(pScrn->scrnIndex, VIDMEM_FRAMEBUFFER,
				 pMga->PciTag, pMga->FbAddress,
				 pMga->FbMapSize);
    if (pMga->FbBase == NULL)
	return FALSE;

    pMga->FbStart = pMga->FbBase + pMga->YDstOrg * (pScrn->bitsPerPixel / 8);

    /* Map the ILOAD transfer window if there is one.  We only make
	DWORD access on DWORD boundaries to this window */
    if (pMga->ILOADAddress) {
	pMga->ILOADBase = xf86MapPciMem(pScrn->scrnIndex,
				VIDMEM_MMIO | VIDMEM_MMIO_32BIT |
				    VIDMEM_READSIDEEFFECT,
				pMga->PciTag, pMga->ILOADAddress, 0x800000);
    } else
	pMga->ILOADBase = NULL;

    return TRUE;
}

static Bool
MGAMapMemFBDev(ScrnInfoPtr pScrn)
{
    MGAPtr pMga;

    pMga = MGAPTR(pScrn);

    pMga->FbBase = fbdevHWMapVidmem(pScrn);
    if (pMga->FbBase == NULL)
	return FALSE;

    pMga->IOBase = fbdevHWMapMMIO(pScrn);
    if (pMga->IOBase == NULL)
	return FALSE;

    pMga->FbStart = pMga->FbBase + pMga->YDstOrg * (pScrn->bitsPerPixel / 8);

#if 1 /* can't ask matroxfb for a mapping of the iload window */

    /* Map the ILOAD transfer window if there is one.  We only make
	DWORD access on DWORD boundaries to this window */
    if(pMga->ILOADAddress)
	pMga->ILOADBase = xf86MapPciMem(pScrn->scrnIndex, VIDMEM_MMIO,
				pMga->PciTag, pMga->ILOADAddress, 0x800000);
    else  pMga->ILOADBase = NULL;
#endif
    return TRUE;
}



/*
 * Unmap the framebuffer and MMIO memory.
 */

static Bool
MGAUnmapMem(ScrnInfoPtr pScrn)
{
    MGAPtr pMga;

    pMga = MGAPTR(pScrn);

    /*
     * Unmap IO registers to virtual address space
     */
    xf86UnMapVidMem(pScrn->scrnIndex, (pointer)pMga->IOBase, 0x4000);
    pMga->IOBase = NULL;

    xf86UnMapVidMem(pScrn->scrnIndex, (pointer)pMga->FbBase, pMga->FbMapSize);
    pMga->FbBase = NULL;
    pMga->FbStart = NULL;

    if(pMga->ILOADBase)
	xf86UnMapVidMem(pScrn->scrnIndex, (pointer)pMga->ILOADBase, 0x800000);
    pMga->ILOADBase = NULL;
    return TRUE;
}

static Bool
MGAUnmapMemFBDev(ScrnInfoPtr pScrn)
{
    MGAPtr pMga;

    pMga = MGAPTR(pScrn);
    fbdevHWUnmapVidmem(pScrn);
    pMga->FbBase = NULL;
    pMga->FbStart = NULL;
    fbdevHWUnmapMMIO(pScrn);
    pMga->IOBase = NULL;
    /* XXX ILOADBase */
    return TRUE;
}




/*
 * This function saves the video state.
 */
static void
MGASave(ScrnInfoPtr pScrn)
{
    vgaHWPtr hwp = VGAHWPTR(pScrn);
    vgaRegPtr vgaReg = &hwp->SavedReg;
    MGAPtr pMga = MGAPTR(pScrn);
    MGARegPtr mgaReg = &pMga->SavedReg;

    if(pMga->SecondCrtc == TRUE) return;
#ifdef USEMGAHAL
    MGA_HAL(if (pMga->pBoard != NULL) MGASaveVgaState(pMga->pBoard));
#endif

    /* I need to save the registers for the second head also */
    /* Save the register for 0x80 to 0xa0 */
    /* Could call it dac2Saved */

    /* Only save text mode fonts/text for the primary card */
    (*pMga->Save)(pScrn, vgaReg, mgaReg, pMga->Primary);
}

#ifdef USEMGAHAL
/* Convert DisplayModeRec parameters in MGAMODEINFO parameters.
*  mode parameter optionnal. */
void
MGAFillModeInfoStruct(ScrnInfoPtr pScrn, DisplayModePtr mode)
{
     const char *s;
    MGAPtr pMga = MGAPTR(pScrn);

    Bool digital1 = FALSE;
    Bool digital2 = FALSE;
    Bool tv1 = FALSE;
    Bool tv2 = FALSE;
    Bool swap_head
      = xf86ReturnOptValBool(pMga->Options, OPTION_SWAPPED_HEAD, FALSE);
        
    if(pMga->MergedFB && mode && mode->Private && (mode->PrivSize == 0)) {
        mode = pMga->SecondCrtc ? 
             ((MergedDisplayModePtr)mode->Private)->Monitor2
            : ((MergedDisplayModePtr)mode->Private)->Monitor1;
    }
    
    
    if (pMga->pMgaHwInfo)
    {
	digital1 = ISDIGITAL1(pMga);
	digital2 = ISDIGITAL2(pMga);
	tv1 = ISTV1(pMga);
	tv2 = ISTV2(pMga);
    }

    /*FIXME: causes segfault elsewhere if not commented*/
    /*if(!pMga->pMgaModeInfo)*/ pMga->pMgaModeInfo = xalloc(sizeof(MGAMODEINFO));
    pMga->pMgaModeInfo->flOutput = 0;
    pMga->pMgaModeInfo->ulDeskWidth = pScrn->virtualX;
    pMga->pMgaModeInfo->ulDeskHeight = pScrn->virtualY;
    pMga->pMgaModeInfo->ulFBPitch = 0;
    pMga->pMgaModeInfo->ulBpp = pScrn->bitsPerPixel;
    pMga->pMgaModeInfo->ulZoom = 1;
    pMga->pMgaModeInfo->flSignalMode = 0x10;

    /* Set TV standard */
    if ((s = xf86GetOptValString(pMga->Options, OPTION_TVSTANDARD))) {
    	if (!xf86NameCmp(s, "PAL")) {
    		pMga->pMgaModeInfo->flSignalMode = 0x00;
    		pMga->pMgaModeInfo->ulRefreshRate = 50;
    		pMga->pMgaModeInfo->ulTVStandard = TV_PAL;
    	} else {
    		pMga->pMgaModeInfo->ulRefreshRate = 60;
    		pMga->pMgaModeInfo->ulTVStandard = TV_NTSC;
    	}
    } else {
    	pMga->pMgaModeInfo->ulRefreshRate = 0;
    	pMga->pMgaModeInfo->ulTVStandard = TV_NTSC;
    }

    /* Set Cable Type */
    if ((s = xf86GetOptValString(pMga->Options, OPTION_CABLETYPE))) {
    	if (!xf86NameCmp(s, "SCART_RGB")) {
    		pMga->pMgaModeInfo->ulCableType = TV_SCART_RGB;
    	} else if (!xf86NameCmp(s, "SCART_COMPOSITE")) {
    		pMga->pMgaModeInfo->ulCableType = TV_SCART_COMPOSITE;
    	} else if (!xf86NameCmp(s, "SCART_TYPE2")) {
    		pMga->pMgaModeInfo->ulCableType = TV_SCART_TYPE2;
    	} else {
    		pMga->pMgaModeInfo->ulCableType = TV_YC_COMPOSITE;
    	}
    } else {
    	pMga->pMgaModeInfo->ulCableType = TV_YC_COMPOSITE;
    }

    if(mode) {
        pMga->pMgaModeInfo->ulHorizRate = 0;
        pMga->pMgaModeInfo->ulDispWidth = mode->HDisplay;
        pMga->pMgaModeInfo->ulDispHeight = mode->VDisplay;
        pMga->pMgaModeInfo->ulPixClock = mode->Clock;
        pMga->pMgaModeInfo->ulHFPorch = mode->HSyncStart - mode->HDisplay;
        pMga->pMgaModeInfo->ulHSync = mode->HSyncEnd - mode->HSyncStart;
        pMga->pMgaModeInfo->ulHBPorch = mode->HTotal - mode->HSyncEnd;
        pMga->pMgaModeInfo->ulVFPorch = mode->VSyncStart - mode->VDisplay;
        pMga->pMgaModeInfo->ulVSync = mode->VSyncEnd - mode->VSyncStart;
        pMga->pMgaModeInfo->ulVBPorch = mode->VTotal - mode->VSyncEnd;
    }
    /* Use DstOrg directly */
    /* This is an offset in pixels not memory */
    pMga->pMgaModeInfo->ulDstOrg = pMga->DstOrg / (pScrn->bitsPerPixel / 8);
    pMga->pMgaModeInfo->ulDisplayOrg = pMga->DstOrg / (pScrn->bitsPerPixel / 8);
    pMga->pMgaModeInfo->ulPanXGran = 0;
    pMga->pMgaModeInfo->ulPanYGran = 0;

    if(pMga->SecondCrtc == TRUE) {
	pMga->pMgaModeInfo->flOutput = MGAMODEINFO_SECOND_CRTC |
				       MGAMODEINFO_FORCE_PITCH |
				       MGAMODEINFO_FORCE_DISPLAYORG;
	if (digital2) {
	    pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_DIGITAL2;
	} else if (tv2) {
	    pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_TV;
	} else {
            if (!swap_head) {
	      pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_ANALOG2;
            } else {
              pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_ANALOG1;
            }
	}
    } else { 
	pMga->pMgaModeInfo->flOutput = MGAMODEINFO_FORCE_PITCH;
        if (digital1) {
	    pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_DIGITAL1;
        } else if (tv1) {
	    pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_TV;
       	} else {
            if (!swap_head) {
	        pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_ANALOG1;
            } else {
                pMga->pMgaModeInfo->flOutput |= MGAMODEINFO_ANALOG2;
            }
        }
    }
    pMga->pMgaModeInfo->ulFBPitch = pScrn->displayWidth;
}
#endif

/*
 * Initialise a new mode.  This is currently still using the old
 * "initialise struct, restore/write struct to HW" model.  That could
 * be changed.
 */

static Bool
MGAModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode)
{
    vgaHWPtr hwp = VGAHWPTR(pScrn);
    vgaRegPtr vgaReg;
    MGAPtr pMga = MGAPTR(pScrn);
    MGARegPtr mgaReg;

#ifdef USEMGAHAL
   ULONG status;
#endif
    vgaHWUnlock(hwp);

/*    if(pMga->MergedFB && mode && mode->Private && (mode->PrivSize == 0)) {
        mode = (DisplayModePtr)mode->Private;
    }*/
    
    /* Initialise the ModeReg values */
    if (!vgaHWInit(pScrn, mode))
	return FALSE;
    pScrn->vtSema = TRUE;

    if (!(*pMga->ModeInit)(pScrn, mode))
	return FALSE;

    /* Program the registers */
    vgaHWProtect(pScrn, TRUE);
    vgaReg = &hwp->ModeReg;
    mgaReg = &pMga->ModeReg;
#ifdef USEMGAHAL
    MGA_HAL( 
        MGAFillModeInfoStruct(pScrn,mode);
                    
        /* Validate the parameters */
        if ((status = MGAValidateMode(pMga->pBoard, pMga->pMgaModeInfo)) != 0) {
            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                    "MGAValidateMode from HALlib found the mode to be invalid.\n"
                    "\tError: %lx\n", status);
            return FALSE;
        }

        /*
         * Find mode for second head. 
         */
        if(pMga->MergedFB) {
    
            MGAFillModeInfoStruct(pMga->pScrn2,mode);
            /* Validates the Video parameters */
            if ((status = MGAValidateVideoParameters(pMga->pBoard, MGAPTR(pMga->pScrn2)->pMgaModeInfo))
                != 0) {
                xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                        "MGAValidateVideoParameters from HALlib found the mode to be invalid.\n\tError: %lx\n", status);
                return FALSE;
            }
        }
    );	 /*MGA_HAL */
    
#endif

#ifdef USEMGAHAL
MGA_HAL(

    /*************************** ESC *****************************/
    TmpMgaModeInfo[0] =  *pMga->pMgaModeInfo;
	
    if(pMga->SecondCrtc == TRUE)
        pMgaModeInfo[1] = pMga->pMgaModeInfo;
    else
        pMgaModeInfo[0] = pMga->pMgaModeInfo;
    
	TmpMgaModeInfo[0].ulDispWidth = 0;
    
    if(!pMga->MergedFB) /* FIXME: Must deal with this once PowerDesk & MergedFB 
                           compatibility will exist */
        MGAFillDisplayModeStruct(mode, pMga->pMgaModeInfo);  
    /*************************************************************/

);	/* MGA_HAL */
#endif

#ifdef XF86DRI
   if (pMga->directRenderingEnabled) {
       DRILock(screenInfo.screens[pScrn->scrnIndex], 0);
   }
#endif

#ifdef USEMGAHAL
    MGA_HAL(
    /* Initialize the board */
    if(MGASetMode(pMga->pBoard,pMga->pMgaModeInfo) != 0) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		"MGASetMode returned an error."
		"  Make sure to validate the mode before.\n");
	return FALSE;
    }
    if(pMga->MergedFB
       && MGASetMode(pMga->pBoard,MGAPTR(pMga->pScrn2)->pMgaModeInfo) != 0) {
  	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "MGASetMode returned an error."
		   "  Make sure to validate the mode before.\n");
    }

    );	/* MGA_HAL */

    /* getting around bugs in the HAL lib. MATROX: hint, hint. */
    MGA_HAL(
	    switch (pMga->Chipset) {
	    case PCI_CHIP_MGA1064:
	    case PCI_CHIP_MGAG100:
	    case PCI_CHIP_MGAG100_PCI:
	    case PCI_CHIP_MGAG200:
	    case PCI_CHIP_MGAG200_PCI:
	    case PCI_CHIP_MGAG400:	      
	    case PCI_CHIP_MGAG550:
		if(pMga->SecondCrtc == FALSE && pMga->HWCursor == TRUE) {
		outMGAdac(MGA1064_CURSOR_BASE_ADR_LOW, 
			  pMga->FbCursorOffset >> 10);
		outMGAdac(MGA1064_CURSOR_BASE_ADR_HI, 
			  pMga->FbCursorOffset >> 18);
		outMGAdac(MGA1064_CURSOR_CTL, 0x00);
	      }
	      if (pMga->Overlay8Plus24 == TRUE) {
    		  outMGAdac(MGA1064_MUL_CTL, MGA1064_MUL_CTL_32bits);
    		  outMGAdac(MGA1064_COL_KEY_MSK_LSB,0xFF);
    		  outMGAdac(MGA1064_COL_KEY_LSB,pMga->colorKey);
  		  outMGAdac(MGA1064_COL_KEY_MSK_MSB,0xFF);
  		  outMGAdac(MGA1064_COL_KEY_MSB,0xFF);
	      }		
	      break;
	    default:
	      break;
	    }
    );	/* MGA_HAL */
#endif

    MGA_NOT_HAL((*pMga->Restore)(pScrn, vgaReg, mgaReg, FALSE));

    MGAStormSync(pScrn);
    MGAStormEngineInit(pScrn);

    vgaHWProtect(pScrn, FALSE);

    if (xf86IsPc98()) {
	if (pMga->Chipset == PCI_CHIP_MGA2064)
	    outb(0xfac, 0x01);
	else
	    outb(0xfac, 0x02);
    }

    pMga->CurrentLayout.mode = mode;

    if(pMga->MergedFB && mode->Private && (mode->PrivSize == 0)) {
	pMga->M1currentMode = (DisplayModePtr)mode->Private;
    }

#ifdef XF86DRI
   if (pMga->directRenderingEnabled)
     DRIUnlock(screenInfo.screens[pScrn->scrnIndex]);
#endif
#ifdef DEBUG
   MGAG450PrintPLL(pScrn);
#endif
    return TRUE;
}

static
void MGARestoreSecondCrtc(ScrnInfoPtr pScrn) 
{
    MGAPtr pMga = MGAPTR(pScrn);
    
    if (MGAISGx50(pMga)) {
        /* Force to return in clone mode */
        if (pMga->SecondOutput 
                && (xf86IsEntityShared(pScrn->entityList[0]) || pMga->SecondCrtc) 
                && !pMga->MergedFB) {
            /* Do this branch if 
             * SecondOutput 
             * and not Unshared Primary 
             * and not Merged Mode (usualy means Unshared Primary) 
             */
            CARD8 ucXDispCtrl = inMGAdac(MGA1064_DISP_CTL);
            
            ucXDispCtrl &= ~0x0c;   /* dac2outsel mask */
            ucXDispCtrl |=  0x04;   /* dac2 -> crtc1   */
                
            outMGAdac(MGA1064_DISP_CTL, ucXDispCtrl);
            
       } else {
            CARD8 ucXDispCtrl = inMGAdac(MGA1064_DISP_CTL);
            CARD32 ulC2CTL = INREG(MGAREG_C2CTL);
                
            ucXDispCtrl &= ~0x0c;   /* dac2outsel mask */
            ucXDispCtrl |= 0x5;     /* dac1outsel -> crtcdacsel, dac2 -> crtc1 */
            ulC2CTL &= ~0x00100000; /* crtcdacsel -> crtc1 */
                
            outMGAdac(MGA1064_DISP_CTL, ucXDispCtrl);
            OUTREG(MGAREG_C2CTL, ulC2CTL);
       }
        
    } else {
        /* Force to close second crtc */
        CARD32 ulC2CTL = INREG(MGAREG_C2CTL);
        
        ulC2CTL &= ~0x1;            /* crtc2 disabled */

        OUTREG(MGAREG_C2CTL, ulC2CTL);
    }

    return;
}

/*
 * Restore the initial (text) mode.
 */
static void
MGARestore(ScrnInfoPtr pScrn)
{
    vgaHWPtr hwp = VGAHWPTR(pScrn);
    vgaRegPtr vgaReg = &hwp->SavedReg;
    MGAPtr pMga = MGAPTR(pScrn);
    MGARegPtr mgaReg = &pMga->SavedReg;

    if (pScrn->pScreen != NULL)
	MGAStormSync(pScrn);

    /*
     * Restore the second crtc if:
     * first and only driver entity
     * second entity
     * Merged Framebuffer mode (first and only driver entity)
     */
    if((!xf86IsEntityShared(pScrn->entityList[0]) && !pMga->SecondCrtc)
       || pMga->SecondCrtc || pMga->MergedFB) {
	/*       if(pMga->MergedFB) {
		 if(pMga->pScrn2) 
                 MGARestoreSecondCrtc(pMga->pScrn2);
		 } else*/
	MGARestoreSecondCrtc(pScrn);
	/* if we are second instance of driver, we've done our job, exit */
	if(pMga->SecondCrtc) return;
    }
    
    /* Only restore text mode fonts/text for the primary card */
    vgaHWProtect(pScrn, TRUE);
    if (pMga->Primary) {
#ifdef USEMGAHAL
	MGA_HAL(
	    if(pMga->pBoard != NULL) {
		MGASetVgaMode(pMga->pBoard);
		MGARestoreVgaState(pMga->pBoard);
	    }
	    );	/* MGA_HAL */
#endif
        (*pMga->Restore)(pScrn, vgaReg, mgaReg, TRUE);
    } else {
        vgaHWRestore(pScrn, vgaReg, VGA_SR_MODE);
    }
    vgaHWProtect(pScrn, FALSE);
}


/* Workaround for a G400 CRTC2 display problem */
static void
MGACrtc2FillStrip(ScrnInfoPtr pScrn)
{
    MGAPtr pMga = MGAPTR(pScrn);

    if (pMga->NoAccel) {
	/* Clears the whole screen, but ... */
	bzero(pMga->FbStart,
	    (pScrn->bitsPerPixel >> 3) * pScrn->displayWidth * pScrn->virtualY);
    } else {
	xf86SetLastScrnFlag(pScrn->entityList[0], pScrn->scrnIndex);
	pMga->RestoreAccelState(pScrn);
	pMga->SetupForSolidFill(pScrn, 0, GXcopy, 0xFFFFFFFF);
	pMga->SubsequentSolidFillRect(pScrn, pScrn->virtualX, 0,
				  pScrn->displayWidth - pScrn->virtualX,
				  pScrn->virtualY);
	MGAStormSync(pScrn);
    }
}


/* Mandatory */

/* This gets called at the start of each server generation */

static Bool
MGAScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
{
    ScrnInfoPtr pScrn;
    vgaHWPtr hwp;
    MGAPtr pMga;
    MGARamdacPtr MGAdac;
    int ret;
    VisualPtr visual;
    unsigned char *FBStart;
    int width, height, displayWidth;
    MGAEntPtr pMgaEnt = NULL;
    int f;
#ifdef XF86DRI
    MessageType driFrom = X_DEFAULT;
#endif

    /*
     * First get the ScrnInfoRec
     */
    pScrn = xf86Screens[pScreen->myNum];

    hwp = VGAHWPTR(pScrn);
    pMga = MGAPTR(pScrn);
    MGAdac = &pMga->Dac;

    
    /* Map the MGA memory and MMIO areas */
    if (pMga->FBDev) {
	if (!MGAMapMemFBDev(pScrn))
	    return FALSE;
    } else {
	if (!MGAMapMem(pScrn))
	    return FALSE;
    }
    
    if ((pMga->Chipset == PCI_CHIP_MGAG100)
	|| (pMga->Chipset == PCI_CHIP_MGAG100_PCI))
        MGAG100BlackMagic(pScrn);

    if (pMga->DualHeadEnabled) {
       DevUnion *pPriv;
       pPriv = xf86GetEntityPrivate(pScrn->entityList[0], MGAEntityIndex);
       pMgaEnt = pPriv->ptr;
       pMgaEnt->refCount++;
#ifdef USEMGAHAL
       MGA_HAL(
       if(pMgaEnt->refCount == 1) {
	   CARD8 MiscCtlReg;
	  pMga->pBoard = xalloc(sizeof(CLIENTDATA) + MGAGetBOARDHANDLESize());
	  pMga->pClientStruct = xalloc(sizeof(CLIENTDATA));
	  pMga->pClientStruct->pMga = (MGAPtr) pMga;
	  
	  /* wrapping OpenLibrary to fix broken registers. MATROX: hint,hint.*/
          MiscCtlReg = inMGAdac(MGA1064_MISC_CTL);
	  MGAOpenLibrary(pMga->pBoard,pMga->pClientStruct,sizeof(CLIENTDATA));
	  outMGAdac(MGA1064_MISC_CTL,MiscCtlReg);
	  pMga->pMgaHwInfo = xalloc(sizeof(MGAHWINFO));
	  MGAGetHardwareInfo(pMga->pBoard,pMga->pMgaHwInfo);

	  /* Detecting for type of display */
	  if (pMga->pMgaHwInfo->ulCapsSecondOutput & MGAHWINFOCAPS_OUTPUT_TV) {
	  	xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "TV detected\n");
	  }
	  if (pMga->pMgaHwInfo->ulCapsFirstOutput &
			MGAHWINFOCAPS_OUTPUT_DIGITAL) {
	  	xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
				"Digital Screen detected\n");
	  }
	  if (pMga->pMgaHwInfo->ulCapsSecondOutput &
			MGAHWINFOCAPS_OUTPUT_DIGITAL) {
	  	xf86DrvMsg(pScrn->scrnIndex, X_PROBED,
				"Digital Screen detected\n");
	  }

	  /* Now copy these to the entitystructure */
	  pMgaEnt->pClientStruct = pMga->pClientStruct;
	  pMgaEnt->pBoard = pMga->pBoard;
	  pMgaEnt->pMgaHwInfo = pMga->pMgaHwInfo;
       } else { /* Ref count is 2 */
	  pMga->pClientStruct = pMgaEnt->pClientStruct;
	  pMga->pBoard = pMgaEnt->pBoard;
	  pMga->pMgaHwInfo = pMgaEnt->pMgaHwInfo;
       }
       );	/* MGA_HAL */
#endif
    } else {
#ifdef USEMGAHAL
	CARD8 MiscCtlReg;

	  MGA_HAL(
	  pMga->pBoard = xalloc(sizeof(CLIENTDATA) + MGAGetBOARDHANDLESize());
	  pMga->pClientStruct = xalloc(sizeof(CLIENTDATA));
	  pMga->pClientStruct->pMga = (MGAPtr) pMga;

	  MiscCtlReg = inMGAdac(MGA1064_MISC_CTL);
	  /* wrapping OpenLibrary to fix broken registers. MATROX: hint,hint.*/
	  MGAOpenLibrary(pMga->pBoard,pMga->pClientStruct,sizeof(CLIENTDATA));
	  outMGAdac(MGA1064_MISC_CTL,MiscCtlReg);
	  pMga->pMgaHwInfo = xalloc(sizeof(MGAHWINFO));
	  MGAGetHardwareInfo(pMga->pBoard,pMga->pMgaHwInfo);
	  );	/* MGA_HAL */
#endif
    }
#ifdef USEMGAHAL
    MGA_HAL(
	/* There is a problem in the HALlib: set soft reset bit */
	/* MATROX: hint, hint. */
	if (!pMga->Primary && !pMga->FBDev &&
	    (pMga->PciInfo->subsysCard == PCI_CARD_MILL_G200_SG) ) {
	    OUTREG(MGAREG_Reset, 1);
	    usleep(200);
	    OUTREG(MGAREG_Reset, 0);
	}
    );	/* MGA_HAL */
#endif

    /* Initialise the MMIO vgahw functions */
    vgaHWSetMmioFuncs(hwp, pMga->IOBase, PORT_OFFSET);
    vgaHWGetIOBase(hwp);

    /* Map the VGA memory when the primary video */
    if (pMga->Primary && !pMga->FBDev) {
	hwp->MapSize = 0x10000;
	if (!vgaHWMapMem(pScrn))
	    return FALSE;
    }

    if (pMga->FBDev) {
	fbdevHWSave(pScrn);
	/* Disable VGA core, and leave memory access on */
	pciSetBitsLong(pMga->PciTag, PCI_OPTION_REG, 0x100, 0x000);
	if (!fbdevHWModeInit(pScrn, pScrn->currentMode))
	    return FALSE;
	if(pMga->SecondCrtc == FALSE && pMga->HWCursor == TRUE) {
	    switch (pMga->Chipset) {
	    case PCI_CHIP_MGA1064:
	    case PCI_CHIP_MGAG100:
	    case PCI_CHIP_MGAG100_PCI:
	    case PCI_CHIP_MGAG200:
	    case PCI_CHIP_MGAG200_PCI:
	    case PCI_CHIP_MGAG400:
	    case PCI_CHIP_MGAG550:
		outMGAdac(MGA1064_CURSOR_BASE_ADR_LOW, pMga->FbCursorOffset >> 10);
		outMGAdac(MGA1064_CURSOR_BASE_ADR_HI, pMga->FbCursorOffset >> 18);
		break;
	    default:
		break;
	    }
	}

	MGAStormEngineInit(pScrn);
    } else {
	/* Save the current state */
	MGASave(pScrn);
	/* Initialise the first mode */
	if (!MGAModeInit(pScrn, pScrn->currentMode))
	    return FALSE;
    }
    /* Darken the screen for aesthetic reasons and set the viewport */
    if (pMga->SecondCrtc == TRUE && !pMga->MergedFB) { 
	MGASaveScreenCrtc2(pScreen, SCREEN_SAVER_ON);
    } 
    if (pMga->SecondCrtc == FALSE && !pMga->MergedFB) {
	MGASaveScreen(pScreen, SCREEN_SAVER_ON);
    }
    if( pMga->MergedFB ) {
	MGASaveScreenMerged( pScreen, SCREEN_SAVER_ON );
    }
    pScrn->AdjustFrame(scrnIndex, pScrn->frameX0, pScrn->frameY0, 0);

    /*
     * The next step is to setup the screen's visuals, and initialise the
     * framebuffer code.  In cases where the framebuffer's default
     * choices for things like visual layouts and bits per RGB are OK,
     * this may be as simple as calling the framebuffer's ScreenInit()
     * function.  If not, the visuals will need to be setup before calling
     * a fb ScreenInit() function and fixed up after.
     *
     * For most PC hardware at depths >= 8, the defaults that cfb uses
     * are not appropriate.  In this driver, we fixup the visuals after.
     */

    /*
     * Reset the visual list.
     */
    miClearVisualTypes();

    /* Setup the visuals we support. */

    /* All MGA support DirectColor and can do overlays in 32bpp */
    if(pMga->Overlay8Plus24 && (pScrn->bitsPerPixel == 32)) {
	if (!miSetVisualTypes(8, PseudoColorMask | GrayScaleMask,
			      pScrn->rgbBits, PseudoColor))
		return FALSE;
	if (!miSetVisualTypes(24, TrueColorMask, pScrn->rgbBits, TrueColor))
		return FALSE;
    } else if (pMga->SecondCrtc) {
	/* No DirectColor on the second head */
	if (!miSetVisualTypes(pScrn->depth, TrueColorMask, pScrn->rgbBits,
			      TrueColor))
		return FALSE;
	if (!miSetPixmapDepths ())
	    return FALSE;
    } else {
	if (!xf86SetDefaultVisual(pScrn, -1))
	    return FALSE;

	if (!miSetVisualTypes(pScrn->depth,
			      miGetDefaultVisualMask(pScrn->depth),
			      pScrn->rgbBits, pScrn->defaultVisual))
	    return FALSE;
	if (!miSetPixmapDepths ())
	    return FALSE;
    }

    /*
     * Call the framebuffer layer's ScreenInit function, and fill in other
     * pScreen fields.
     */

    width = pScrn->virtualX;
    height = pScrn->virtualY;
    displayWidth = pScrn->displayWidth;


    if(pMga->Rotate) {
	height = pScrn->virtualX;
	width = pScrn->virtualY;
    }

    if(pMga->ShadowFB) {
 	pMga->ShadowPitch = BitmapBytePad(pScrn->bitsPerPixel * width);
	pMga->ShadowPtr = xalloc(pMga->ShadowPitch * height);
	displayWidth = pMga->ShadowPitch / (pScrn->bitsPerPixel >> 3);
        FBStart = pMga->ShadowPtr;
    } else {
	pMga->ShadowPtr = NULL;
	FBStart = pMga->FbStart;
    }

#ifdef XF86DRI
     /*
      * Setup DRI after visuals have been established, but before cfbScreenInit
      * is called.   cfbScreenInit will eventually call into the drivers
      * InitGLXVisuals call back.
      * The DRI does not work when textured video is enabled at this time.
      */
    if (!xf86ReturnOptValBool(pMga->Options, OPTION_DRI, TRUE)) {
	driFrom = X_CONFIG;
    } else if ( pMga->NoAccel ) {
       xf86DrvMsg( pScrn->scrnIndex, X_ERROR,
		   "Acceleration disabled, not initializing the DRI\n" );
       pMga->directRenderingEnabled = FALSE;
       driFrom = X_CONFIG;
    }
    else if ( pMga->TexturedVideo == TRUE ) {
       xf86DrvMsg( pScrn->scrnIndex, X_ERROR,
		   "Textured video enabled, not initializing the DRI\n" );
       pMga->directRenderingEnabled = FALSE;
       driFrom = X_CONFIG;
    }
    else if (pMga->SecondCrtc == TRUE) {
       xf86DrvMsg( pScrn->scrnIndex, X_ERROR,
		   "Not initializing the DRI on the second head\n" );
       pMga->directRenderingEnabled = FALSE;
    }
    else if ((pMga->FbMapSize /
	       (width * (pScrn->bitsPerPixel >> 3))) <= height * 3) {
       xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
	  "Static buffer allocation failed, not initializing the DRI\n");
       xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
	  "Need at least %d kB video memory at this resolution, bit depth\n",
	  (3 * displayWidth * height * (pScrn->bitsPerPixel >> 3)) / 1024 );
       pMga->directRenderingEnabled = FALSE;
       driFrom = X_PROBED;
    }
    else {
       pMga->directRenderingEnabled = MGADRIScreenInit(pScreen);
    }
#endif


    if (pMga->Overlay8Plus24) {
	ret = cfb8_32ScreenInit(pScreen, FBStart,
			width, height,
			pScrn->xDpi, pScrn->yDpi,
			displayWidth);
    } else {
	ret = fbScreenInit(pScreen, FBStart, width, height,
			   pScrn->xDpi, pScrn->yDpi,
			   displayWidth, pScrn->bitsPerPixel);
    }

    if (!ret)
	return FALSE;


    if (pScrn->bitsPerPixel > 8) {
        /* Fixup RGB ordering */
        visual = pScreen->visuals + pScreen->numVisuals;
        while (--visual >= pScreen->visuals) {
	    if ((visual->class | DynamicClass) == DirectColor) {
		visual->offsetRed = pScrn->offset.red;
		visual->offsetGreen = pScrn->offset.green;
		visual->offsetBlue = pScrn->offset.blue;
		visual->redMask = pScrn->mask.red;
		visual->greenMask = pScrn->mask.green;
		visual->blueMask = pScrn->mask.blue;
	    }
	}
    }

    /* must be after RGB ordering fixed */
    if (!pMga->Overlay8Plus24)
	fbPictureInit (pScreen, 0, 0);
    
    xf86SetBlackWhitePixels(pScreen);

    pMga->BlockHandler = pScreen->BlockHandler;
    pScreen->BlockHandler = MGABlockHandler;

    if(!pMga->ShadowFB) /* hardware cursor needs to wrap this layer */
	MGADGAInit(pScreen);

    if (!pMga->NoAccel)
	MGAStormAccelInit(pScreen);

    miInitializeBackingStore(pScreen);
    xf86SetBackingStore(pScreen);
    xf86SetSilkenMouse(pScreen);

    /* Initialize software cursor.
	Must precede creation of the default colormap */
    miDCInitialize(pScreen, xf86GetPointerScreenFuncs());

    /* Initialize HW cursor layer.
	Must follow software cursor initialization*/
    if (pMga->HWCursor) {
	if(!MGAHWCursorInit(pScreen))
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		"Hardware cursor initialization failed\n");
    }
    if(pMga->MergedFB) {
        /* Rotate and MergedFB are mutiualy exclusive, so we can use this 
         * variable.
         */
        if (!pMga->PointerMoved) 
            pMga->PointerMoved = pScrn->PointerMoved;
        pScrn->PointerMoved = MGAMergePointerMoved; 
        
    }

    /* Initialise default colourmap */
    if (!miCreateDefColormap(pScreen))
	return FALSE;

    /* Initialize colormap layer.
	Must follow initialization of the default colormap */
    if (!pMga->SecondCrtc)
	f = CMAP_PALETTED_TRUECOLOR | CMAP_RELOAD_ON_MODE_SWITCH;
    else
	f = CMAP_RELOAD_ON_MODE_SWITCH;
    if(!xf86HandleColormaps(pScreen, 256, 8,
	(pMga->FBDev ? fbdevHWLoadPalette : MGAdac->LoadPalette), NULL, f))
	return FALSE;

    if(pMga->Overlay8Plus24) { /* Must come after colormap initialization */
	if(!xf86Overlay8Plus32Init(pScreen))
	    return FALSE;
    }

    if(pMga->ShadowFB) {
	RefreshAreaFuncPtr refreshArea = MGARefreshArea;

	if(pMga->Rotate) {
	    if (!pMga->PointerMoved) {
	    pMga->PointerMoved = pScrn->PointerMoved;
	    pScrn->PointerMoved = MGAPointerMoved;
	    }

	   switch(pScrn->bitsPerPixel) {
	   case 8:	refreshArea = MGARefreshArea8;	break;
	   case 16:	refreshArea = MGARefreshArea16;	break;
	   case 24:	refreshArea = MGARefreshArea24;	break;
	   case 32:	refreshArea = MGARefreshArea32;	break;
	   }
	}

	ShadowFBInit(pScreen, refreshArea);
    }

    if(pMga->SecondCrtc == TRUE && !pMga->MergedFB) { 
        xf86DPMSInit(pScreen, MGADisplayPowerManagementSetCrtc2, 0);
    } 
    if(pMga->SecondCrtc == FALSE && !pMga->MergedFB) {
        xf86DPMSInit(pScreen, MGADisplayPowerManagementSet, 0);
    }
    if(pMga->MergedFB) {
        xf86DPMSInit(pScreen, MGADisplayPowerManagementSetMerged, 0);
    }
    
    pScrn->memPhysBase = pMga->FbAddress;
    pScrn->fbOffset = pMga->YDstOrg * (pScrn->bitsPerPixel / 8);

    if(!pMga->MergedFB) {
        if(pMga->SecondCrtc == TRUE) { 
    	    pScreen->SaveScreen = MGASaveScreenCrtc2;
        } else {
            pScreen->SaveScreen = MGASaveScreen;
        }
    } else { /* Merged FB */
        pScreen->SaveScreen = MGASaveScreenMerged;
    }

    MGAInitVideo(pScreen);

#ifdef XF86DRI
    if (pMga->directRenderingEnabled) {
       /* Now that mi, cfb, drm and others have done their thing,
	* complete the DRI setup.
	*/
       pMga->directRenderingEnabled = MGADRIFinishScreenInit(pScreen);
    }
    if (pMga->directRenderingEnabled) {
        xf86DrvMsg(pScrn->scrnIndex, driFrom, "Direct rendering enabled\n");
    } else {
        xf86DrvMsg(pScrn->scrnIndex, driFrom, "Direct rendering disabled\n");
    }
    if (pMga->DualHeadEnabled && pMga->SecondCrtc == FALSE)
	pMgaEnt->directRenderingEnabled = pMga->directRenderingEnabled;
    pMga->haveQuiescense = 1;
#endif

    /* Wrap the current CloseScreen function */
    pMga->CloseScreen = pScreen->CloseScreen;
    pScreen->CloseScreen = MGACloseScreen;

    /* Report any unused options (only for the first generation) */
    if (serverGeneration == 1) {
	xf86ShowUnusedOptions(pScrn->scrnIndex, pScrn->options);
    }

    /* For the second head, work around display problem. */
    if (!pMga->MergedFB && pMga->SecondCrtc) {
	MGACrtc2FillStrip(pScrn);
    }

    /* Done */
    return TRUE;
}


/* Usually mandatory */
Bool
MGASwitchMode(int scrnIndex, DisplayModePtr mode, int flags)
{
#ifdef USEMGAHAL
    char sCmdIn[256];
    char sCmdOut[256];
    FILE* fdIn;
# ifdef MATROX_WRITEBACK
    FILE* fdOut;
# endif
#endif
 
    if  (mode->Flags & 0x80000000) {
#ifdef USEMGAHAL

# ifdef MATROX_WRITEBACK
#  define MWB(x) { x; }
#  define MWB_COND(x) x
# else
#  define MWB(x)
#  define MWB_COND(x) 1
# endif
	ScrnInfoPtr pScrn = xf86Screens[scrnIndex];

	MGA_HAL(
	fdIn = fopen("/tmp/mgaDriverIn", "rt");
	MWB(fdOut = fopen("/tmp/mgaDriverOut", "wt"))

	if(fdIn && MWB_COND(fdOut))
	{
 
	    fgets(sCmdIn, 255, fdIn);
 
	    if(sCmdIn)
	    {
 
		MGAExecuteEscCmd(xf86Screens[scrnIndex], sCmdIn, sCmdOut, mode);
 
		/* Remove file and close file descriptor */
		remove("/tmp/mgaDriverIn");
		fclose(fdIn);
		MWB(
		    /* Write output data to output file for
		       calling application */
		    fputs(sCmdOut, fdOut);
		    fclose(fdOut);
		    )
		mode->Flags &= 0x7FFFFFFF;
		return TRUE;
	    }
	    else
	    {
		mode->Flags &= 0x7FFFFFFF;
		return FALSE;
	    }
	}
	else
	{
	    mode->Flags &= 0x7FFFFFFF;
	    return FALSE;
	}
   )
#endif
 	return FALSE; 
    }   else
	return MGAModeInit(xf86Screens[scrnIndex], mode);
}
 
 /* Adjusts coordinates to match Panning granularity.
  * does nothing if the HALlib is not loaded
  */
void
MGAAdjustGranularity(ScrnInfoPtr pScrn, int* x, int* y)
{
#ifdef USEMGAHAL
    MGA_HAL(
	MGAPtr pMga = MGAPTR(pScrn);
	MGAPtr pMga2;
	int xg = 1;
	int yg = 1;
	if(pMga->pMgaModeInfo && pMga->pMgaModeInfo->ulPanXGran && pMga->pMgaModeInfo->ulPanYGran) {
	    xg = pMga->pMgaModeInfo->ulPanXGran;
	    yg = pMga->pMgaModeInfo->ulPanYGran;
	}
	if(pMga->pScrn2 && (pMga2 = MGAPTR(pMga->pScrn2)) ) {

	    if(pMga2->pMgaModeInfo && pMga2->pMgaModeInfo->ulPanXGran && pMga2->pMgaModeInfo->ulPanYGran) {
		xg = max(xg,pMga2->pMgaModeInfo->ulPanXGran);
		yg = max(yg,pMga2->pMgaModeInfo->ulPanYGran);
	    }
	}
	xg=16; /*ncoder: temporary */ 
	*x -= *x % xg;
	*y -= *y % yg;
	); 
#endif
}


/*
 * This function is used to initialize the Start Address - the first
 * displayed location in the video memory.
 */
/* Usually mandatory */
void
MGAAdjustFrame(int scrnIndex, int x, int y, int flags)
{
    ScrnInfoPtr pScrn;
    int Base, tmp, count;

    MGAFBLayout *pLayout;
    MGAPtr pMga;

    
    pScrn = xf86Screens[scrnIndex];
    pMga = MGAPTR(pScrn);
    pLayout = &pMga->CurrentLayout;
    
        /* wanted to improve panning granularity problems without risking
         * compatibility issues. Existing code looked hardware dependent.
         */
#ifdef USEMGAHAL
    MGA_HAL(
	    pMga->HALGranularityOffX = x;
	    pMga->HALGranularityOffY = y;
        MGAAdjustGranularity(pScrn,&x,&y);
	    pMga->HALGranularityOffX = pMga->HALGranularityOffX - x;
	    pMga->HALGranularityOffY = pMga->HALGranularityOffY - y;
        HALSetDisplayStart(pMga->pBoard,x,y,0);
    );
#endif
    MGA_NOT_HAL(
        if(pMga->ShowCache && y && pScrn->vtSema)
            y += pScrn->virtualY - 1;
            
        Base = (y * pLayout->displayWidth + x + pMga->YDstOrg) >>
                    (3 - pMga->BppShifts[(pLayout->bitsPerPixel >> 3) - 1]);

        if (pLayout->bitsPerPixel == 24) {
            if (pMga->Chipset == PCI_CHIP_MGAG400 || pMga->Chipset == PCI_CHIP_MGAG550)
            Base &= ~1;  /*1 Not sure why */
            Base *= 3;
        }

        /* find start of retrace */
        while (INREG8(0x1FDA) & 0x08);
        while (!(INREG8(0x1FDA) & 0x08));
        /* wait until we're past the start (fixseg.c in the DDK) */
        count = INREG(MGAREG_VCOUNT) + 2;
        while(INREG(MGAREG_VCOUNT) < count);

        OUTREG16(MGAREG_CRTC_INDEX, (Base & 0x00FF00) | 0x0C);
        OUTREG16(MGAREG_CRTC_INDEX, ((Base & 0x0000FF) << 8) | 0x0D);
        OUTREG8(MGAREG_CRTCEXT_INDEX, 0x00);
        tmp = INREG8(MGAREG_CRTCEXT_DATA);
        OUTREG8(MGAREG_CRTCEXT_DATA, (tmp & 0xF0) | ((Base & 0x0F0000) >> 16));
    );

}

#define C2STARTADD0 0x3C28

void
MGAAdjustFrameCrtc2(int scrnIndex, int x, int y, int flags)
{
    ScrnInfoPtr pScrn;
    int Base;
    MGAFBLayout *pLayout;
    MGAPtr pMga;

    pScrn = xf86Screens[scrnIndex];
    pMga = MGAPTR(pScrn);
    pLayout = &pMga->CurrentLayout;
#ifdef USEMGAHAL
    MGA_HAL(
        MGAAdjustGranularity(pScrn,&x,&y);
        HALSetDisplayStart(pMga->pBoard,x,y,1);
    );
#endif
    MGA_NOT_HAL(
        if(pMga->ShowCache && y && pScrn->vtSema)
            y += pScrn->virtualY - 1;

        /* 3-85 c2offset
            * 3-93 c2startadd0
            * 3-96 c2vcount
            */

        Base = (y * pLayout->displayWidth + x) * pLayout->bitsPerPixel >> 3;
        Base += pMga->DstOrg;
        Base &= 0x01ffffc0;
        OUTREG(C2STARTADD0, Base);
    );
}

/*
 * This is called when VT switching back to the X server.  Its job is
 * to reinitialise the video mode.
 *
 * We may wish to unmap video/MMIO memory too.
 */

/* Mandatory */
static Bool
MGAEnterVT(int scrnIndex, int flags)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    MGAPtr pMga;

    pMga = MGAPTR(pScrn);

#ifdef XF86DRI
    if (pMga->directRenderingEnabled) {
	if (pMga->irq) {
	    /* Need to make sure interrupts are enabled */
	    OUTREG(MGAREG_IEN, pMga->reg_ien);
	}
        DRIUnlock(screenInfo.screens[scrnIndex]);
    }
#endif

    if (!MGAModeInit(pScrn, pScrn->currentMode))
	return FALSE;
    pScrn->AdjustFrame(scrnIndex, pScrn->frameX0, pScrn->frameY0, 0);

    /* For the second head, work around display problem. */
   if (pMga->SecondCrtc) {
	MGACrtc2FillStrip(pScrn);
    }

    return TRUE;
}

static Bool
MGAEnterVTFBDev(int scrnIndex, int flags)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
#ifdef XF86DRI
    ScreenPtr pScreen;
    MGAPtr pMga;

    pMga = MGAPTR(pScrn);
    if (pMga->directRenderingEnabled) {
        pScreen = screenInfo.screens[scrnIndex];
        DRIUnlock(pScreen);
    }
#endif

    fbdevHWEnterVT(scrnIndex,flags);
    MGAStormEngineInit(pScrn);
    return TRUE;
}

#define RESTORE_TEXTMODE_ON_DVI(x)                      \
    if (MGAISGx50(x) &&                                 \
       (ISDIGITAL1(x) || ISDIGITAL2(x))) {              \
        /* Reset DUALDVI register */                    \
        outMGAdac(MGA1064_DVI_PIPE_CTL, 0x0);           \
        /* Set Panel mode between 20 and 54 MHz */      \
        outMGAdac(MGA1064_PAN_CTL, 0x7);                \
    }
    

/*
 * This is called when VT switching away from the X server.  Its job is
 * to restore the previous (text) mode.
 *
 * We may wish to remap video/MMIO memory too.
 */

/* Mandatory */
static void
MGALeaveVT(int scrnIndex, int flags)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    vgaHWPtr hwp = VGAHWPTR(pScrn);
#ifdef XF86DRI
    MGAPtr pMga = MGAPTR(pScrn);
    ScreenPtr pScreen;
#endif

    MGARestore(pScrn);
    vgaHWLock(hwp);

    if (xf86IsPc98())
	outb(0xfac, 0x00);
#ifdef XF86DRI
    if (pMga->directRenderingEnabled) {
        pScreen = screenInfo.screens[scrnIndex];
        DRILock(pScreen, 0);
    }
#endif
#ifdef USEMGAHAL
    MGA_HAL( RESTORE_TEXTMODE_ON_DVI(pMga); );
#endif
}


/*
 * This is called at the end of each server generation.  It restores the
 * original (text) mode.  It should also unmap the video memory, and free
 * any per-generation data allocated by the driver.  It should finish
 * by unwrapping and calling the saved CloseScreen function.
 */

/* Mandatory */
static Bool
MGACloseScreen(int scrnIndex, ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    vgaHWPtr hwp = VGAHWPTR(pScrn);
    MGAPtr pMga = MGAPTR(pScrn);
    MGAEntPtr pMgaEnt = NULL;

#ifdef USEMGAHAL    
    MGA_HAL( RESTORE_TEXTMODE_ON_DVI(pMga); );
#endif
    if (pMga->MergedFB)
         MGACloseScreenMerged(scrnIndex, pScreen);

    if (pScrn->vtSema) {
	if (pMga->FBDev) {
	    fbdevHWRestore(pScrn);
	    MGAUnmapMemFBDev(pScrn);
        } else {
	    MGARestore(pScrn);
	    vgaHWLock(hwp);
	    MGAUnmapMem(pScrn);
	    vgaHWUnmapMem(pScrn);
	}
    }
#ifdef XF86DRI
   if (pMga->directRenderingEnabled) {
       MGADRICloseScreen(pScreen);
       pMga->directRenderingEnabled=FALSE;
   }
#endif

   if (pMga->DualHeadEnabled) {
       DevUnion *pPriv;
       pPriv = xf86GetEntityPrivate(pScrn->entityList[0], MGAEntityIndex);
       pMgaEnt = pPriv->ptr;
       pMgaEnt->refCount--;
   }

#ifdef USEMGAHAL
   MGA_HAL(
   if(pMga->DualHeadEnabled) {
      if(pMgaEnt->refCount == 0) {
	 /* Both boards have closed there screen */
	 MGACloseLibrary(pMga->pBoard);

	 if (pMga->pBoard)
	   xfree(pMga->pBoard);
	 if (pMga->pClientStruct)
	   xfree(pMga->pClientStruct);
	 if (pMga->pMgaModeInfo)
	   xfree(pMga->pMgaModeInfo);
	 if (pMga->pMgaHwInfo)
	   xfree(pMga->pMgaHwInfo);
      }
   } else {
      MGACloseLibrary(pMga->pBoard);

      if (pMga->pBoard)
	xfree(pMga->pBoard);
      if (pMga->pClientStruct)
	xfree(pMga->pClientStruct);
      if (pMga->pMgaModeInfo)
	xfree(pMga->pMgaModeInfo);
      if (pMga->pMgaHwInfo)
	xfree(pMga->pMgaHwInfo);
   }
   );	/* MGA_HAL */
#endif

    if (pMga->AccelInfoRec)
	XAADestroyInfoRec(pMga->AccelInfoRec);
    if (pMga->CursorInfoRec)
    	xf86DestroyCursorInfoRec(pMga->CursorInfoRec);
    if (pMga->ShadowPtr)
	xfree(pMga->ShadowPtr);
    if (pMga->DGAModes)
	xfree(pMga->DGAModes);
    if (pMga->adaptor)
	xfree(pMga->adaptor);
    if (pMga->portPrivate)
	xfree(pMga->portPrivate);
    if (pMga->ScratchBuffer)
	xfree(pMga->ScratchBuffer);

    pScrn->vtSema = FALSE;

    if (xf86IsPc98())
	outb(0xfac, 0x00);

    xf86ClearPrimInitDone(pScrn->entityList[0]);

    if(pMga->BlockHandler)
	pScreen->BlockHandler = pMga->BlockHandler;

    pScreen->CloseScreen = pMga->CloseScreen;

    return (*pScreen->CloseScreen)(scrnIndex, pScreen);
}


/* Free up any persistent data structures */

/* Optional */
static void
MGAFreeScreen(int scrnIndex, int flags)
{
	
    /*
     * This only gets called when a screen is being deleted.  It does not
     * get called routinely at the end of a server generation.
     */
    if (xf86LoaderCheckSymbol("vgaHWFreeHWRec"))
	vgaHWFreeHWRec(xf86Screens[scrnIndex]);
    MGAFreeRec(xf86Screens[scrnIndex]);

}


/* Checks if a mode is suitable for the selected chipset. */

/* Optional */
static ModeStatus
MGAValidMode(int scrnIndex, DisplayModePtr mode, Bool verbose, int flags)
{
    int lace;
    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
    MGAPtr pMga = MGAPTR(pScrn);

    lace = 1 + ((mode->Flags & V_INTERLACE) != 0);

    if ((mode->CrtcHDisplay <= 2048) &&
	(mode->CrtcHSyncStart <= 4096) &&
	(mode->CrtcHSyncEnd <= 4096) &&
	(mode->CrtcHTotal <= 4096) &&
	(mode->CrtcVDisplay <= 2048 * lace) &&
	(mode->CrtcVSyncStart <= 4096 * lace) &&
	(mode->CrtcVSyncEnd <= 4096 * lace) &&
	(mode->CrtcVTotal <= 4096 * lace)) {

	/* Can't have horizontal panning for second head of G400 */
	if (pMga->SecondCrtc) {
	    if (flags == MODECHECK_FINAL) {
		if (pMga->allowedWidth == 0)
		    pMga->allowedWidth = pScrn->virtualX;
		if (mode->HDisplay != pMga->allowedWidth)
		    return(MODE_ONE_WIDTH);
	    }
	}

	return(MODE_OK);
    } else {
	return(MODE_BAD);
    }
}


/*
 * This routine is required but since we can't easily blank the
 * second display without risking powering off the monitor, return
 * FALSE and let the X server do something generic.
 */
static Bool
MGASaveScreenCrtc2(ScreenPtr pScreen, int mode)
{
    return FALSE;
}

/* Do screen blanking */

static Bool
MGASaveScreen(ScreenPtr pScreen, int mode)
{
    return vgaHWSaveScreen(pScreen, mode);
}


/*
 * MGADisplayPowerManagementSet --
 *
 * Sets VESA Display Power Management Signaling (DPMS) Mode.
 */
void
MGADisplayPowerManagementSet(ScrnInfoPtr pScrn, int PowerManagementMode,
			     int flags)
{
	MGAPtr pMga = MGAPTR(pScrn);
	unsigned char seq1 = 0, crtcext1 = 0;

	switch (PowerManagementMode)
	{
	case DPMSModeOn:
	    /* Screen: On; HSync: On, VSync: On */
	    seq1 = 0x00;
	    crtcext1 = 0x00;
	    break;
	case DPMSModeStandby:
	    /* Screen: Off; HSync: Off, VSync: On */
	    seq1 = 0x20;
	    crtcext1 = 0x10;
	    break;
	case DPMSModeSuspend:
	    /* Screen: Off; HSync: On, VSync: Off */
	    seq1 = 0x20;
	    crtcext1 = 0x20;
	    break;
	case DPMSModeOff:
	    /* Screen: Off; HSync: Off, VSync: Off */
	    seq1 = 0x20;
	    crtcext1 = 0x30;
	    break;
	}
	/* XXX Prefer an implementation that doesn't depend on VGA specifics */
	OUTREG8(MGAREG_SEQ_INDEX, 0x01);	/* Select SEQ1 */
	seq1 |= INREG8(MGAREG_SEQ_DATA) & ~0x20;
	OUTREG8(MGAREG_SEQ_DATA, seq1);
	OUTREG8(MGAREG_CRTCEXT_INDEX, 0x01);	/* Select CRTCEXT1 */
	crtcext1 |= INREG8(MGAREG_CRTCEXT_DATA) & ~0x30;
	OUTREG8(MGAREG_CRTCEXT_DATA, crtcext1);
}


void
MGADisplayPowerManagementSetCrtc2(ScrnInfoPtr pScrn, int PowerManagementMode,
				  int flags)
{
	MGAPtr pMga = MGAPTR(pScrn);
	CARD32 crtc2 = 0;

        if (PowerManagementMode != DPMSModeOn)
            crtc2 = 0x8;			/* c2pixclkdis */
	crtc2 |= INREG(MGAREG_C2CTL) & ~0x8;
	OUTREG(MGAREG_C2CTL, crtc2);
}


static void
MGABlockHandler (
    int i,
    pointer     blockData,
    pointer     pTimeout,
    pointer     pReadmask
){
    ScreenPtr      pScreen = screenInfo.screens[i];
    ScrnInfoPtr    pScrn = xf86Screens[i];
    MGAPtr         pMga = MGAPTR(pScrn);

    if(pMga->PaletteLoadCallback)
	(*pMga->PaletteLoadCallback)(pScrn);

    pScreen->BlockHandler = pMga->BlockHandler;
    (*pScreen->BlockHandler) (i, blockData, pTimeout, pReadmask);
    pScreen->BlockHandler = MGABlockHandler;

    if(pMga->VideoTimerCallback) {
	UpdateCurrentTime();
	(*pMga->VideoTimerCallback)(pScrn, currentTime.milliseconds);
    }

    if(pMga->RenderCallback)
	(*pMga->RenderCallback)(pScrn);
}

#if defined (EXTRADEBUG)
/*
 * some functions to track input/output in the server
 */

CARD8
MGAdbg_inreg8(ScrnInfoPtr pScrn,int addr,int verbose, char* func)
{
    CARD8 ret;

    ret = MMIO_IN8(MGAPTR(pScrn)->IOBase,addr);
    if(verbose)
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
			"inreg8 : %s: 0x%8x = 0x%x\n",func, addr,ret);
    return ret;
}

CARD16
MGAdbg_inreg16(ScrnInfoPtr pScrn,int addr,int verbose, char* func)
{
    CARD16 ret;

    ret = MMIO_IN16(MGAPTR(pScrn)->IOBase,addr);
    if(verbose)
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
			"inreg16: %s: 0x%8x = 0x%x\n",func, addr,ret);
    return ret;
}

CARD32
MGAdbg_inreg32(ScrnInfoPtr pScrn,int addr,int verbose, char* func)
{
    CARD32 ret;

    ret = MMIO_IN32(MGAPTR(pScrn)->IOBase,addr);
    if(verbose)
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
			"inreg32: %s: 0x%8x = 0x%x\n",func, addr,ret);
    return ret;
}

void
MGAdbg_outreg8(ScrnInfoPtr pScrn,int addr,int val, char* func)
{
    CARD8 ret;

#if 0
    if( addr = MGAREG_CRTCEXT_DATA )
    	return;
#endif
    if( addr != 0x3c00 ) {
	ret = MGAdbg_inreg8(pScrn,addr,0,func);
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
			"outreg8 : %s: 0x%8x = 0x%x was 0x%x\n",
			func,addr,val,ret);
    }
    else {
	xf86DrvMsg(pScrn->scrnIndex, X_INFO, "outreg8 : %s: index 0x%x\n",
	func,val);
    }
    MMIO_OUT8(MGAPTR(pScrn)->IOBase,addr,val);
}

void
MGAdbg_outreg16(ScrnInfoPtr pScrn,int addr,int val, char* func)
{
    CARD16 ret;

#if 0
    if (addr == MGAREG_CRTCEXT_INDEX)
    	return;
#endif
    ret = MGAdbg_inreg16(pScrn,addr,0, func);
    xf86DrvMsg(pScrn->scrnIndex, X_INFO,
			"outreg16: %s: 0x%8x = 0x%x was 0x%x\n",
			func,addr,val,ret);
    MMIO_OUT16(MGAPTR(pScrn)->IOBase,addr,val);
}

void
MGAdbg_outreg32(ScrnInfoPtr pScrn,int addr,int val, char* func)
{
    CARD32 ret;

    if (((addr & 0xff00) == 0x1c00)
    	&& (addr != 0x1c04)
/*    	&& (addr != 0x1c1c) */
    	&& (addr != 0x1c20)
    	&& (addr != 0x1c24)
    	&& (addr != 0x1c80)
    	&& (addr != 0x1c8c)
    	&& (addr != 0x1c94)
    	&& (addr != 0x1c98)
    	&& (addr != 0x1c9c)
	 ) {
	 xf86DrvMsg(pScrn->scrnIndex, X_INFO, "%s: refused address 0x%x\n",
			func,addr);
    	return;
    }
    ret = MGAdbg_inreg32(pScrn,addr,0, func);
    xf86DrvMsg(pScrn->scrnIndex, X_INFO,
			"outreg32: %s: 0x%8x = 0x%x was 0x%x\n",
			func,addr,val,ret);
    MMIO_OUT32(MGAPTR(pScrn)->IOBase,addr,val);
}
#endif /* DEBUG */

static void
MGAG100BlackMagic(ScrnInfoPtr pScrn)
{
    MGAPtr pMga = MGAPTR(pScrn);

    OUTREG(MGAREG_PLNWT, ~(CARD32)0x0);
    /* reset memory */
    OUTREG(MGAREG_MACCESS, 1<<15);
    usleep(10);
}