 /***************************************************************************\
|*                                                                           *|
|*       Copyright 1993-1999 NVIDIA, Corporation.  All rights reserved.      *|
|*                                                                           *|
|*     NOTICE TO USER:   The source code  is copyrighted under  U.S. and     *|
|*     international laws.  Users and possessors of this source code are     *|
|*     hereby granted a nonexclusive,  royalty-free copyright license to     *|
|*     use this code in individual and commercial software.                  *|
|*                                                                           *|
|*     Any use of this source code must include,  in the user documenta-     *|
|*     tion and  internal comments to the code,  notices to the end user     *|
|*     as follows:                                                           *|
|*                                                                           *|
|*       Copyright 1993-1999 NVIDIA, Corporation.  All rights reserved.      *|
|*                                                                           *|
|*     NVIDIA, CORPORATION MAKES NO REPRESENTATION ABOUT THE SUITABILITY     *|
|*     OF  THIS SOURCE  CODE  FOR ANY PURPOSE.  IT IS  PROVIDED  "AS IS"     *|
|*     WITHOUT EXPRESS OR IMPLIED WARRANTY OF ANY KIND.  NVIDIA, CORPOR-     *|
|*     ATION DISCLAIMS ALL WARRANTIES  WITH REGARD  TO THIS SOURCE CODE,     *|
|*     INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGE-     *|
|*     MENT,  AND FITNESS  FOR A PARTICULAR PURPOSE.   IN NO EVENT SHALL     *|
|*     NVIDIA, CORPORATION  BE LIABLE FOR ANY SPECIAL,  INDIRECT,  INCI-     *|
|*     DENTAL, OR CONSEQUENTIAL DAMAGES,  OR ANY DAMAGES  WHATSOEVER RE-     *|
|*     SULTING FROM LOSS OF USE,  DATA OR PROFITS,  WHETHER IN AN ACTION     *|
|*     OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,  ARISING OUT OF     *|
|*     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOURCE CODE.     *|
|*                                                                           *|
|*     U.S. Government  End  Users.   This source code  is a "commercial     *|
|*     item,"  as that  term is  defined at  48 C.F.R. 2.101 (OCT 1995),     *|
|*     consisting  of "commercial  computer  software"  and  "commercial     *|
|*     computer  software  documentation,"  as such  terms  are  used in     *|
|*     48 C.F.R. 12.212 (SEPT 1995)  and is provided to the U.S. Govern-     *|
|*     ment only as  a commercial end item.   Consistent with  48 C.F.R.     *|
|*     12.212 and  48 C.F.R. 227.7202-1 through  227.7202-4 (JUNE 1995),     *|
|*     all U.S. Government End Users  acquire the source code  with only     *|
|*     those rights set forth herein.                                        *|
|*                                                                           *|
 \***************************************************************************/
/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/nv/riva_hw.c,v 1.47 2003/02/10 23:42:51 mvojkovi Exp $ */

#include "nv_local.h"
#include "compiler.h"
#include "nv_include.h"
#include "riva_hw.h"
#include "riva_tbl.h"

/*
 * This file is an OS-agnostic file used to make RIVA 128 and RIVA TNT
 * operate identically (except TNT has more memory and better 3D quality.
 */
static int nv3Busy
(
    RIVA_HW_INST *chip
)
{
    return ((chip->Rop->FifoFree < chip->FifoEmptyCount) || (chip->PGRAPH[0x000006B0/4] & 0x01));
}
static int nv4Busy
(
    RIVA_HW_INST *chip
)
{
    return ((chip->Rop->FifoFree < chip->FifoEmptyCount) || (chip->PGRAPH[0x00000700/4] & 0x01));
}
static int nv10Busy
(
    RIVA_HW_INST *chip
)
{
    return ((chip->Rop->FifoFree < chip->FifoEmptyCount) || (chip->PGRAPH[0x00000700/4] & 0x01));
}
static void vgaLockUnlock
(
    RIVA_HW_INST *chip,
    Bool           Lock
)
{
    CARD8 cr11;
    VGA_WR08(chip->PCIO, 0x3D4, 0x11);
    cr11 = VGA_RD08(chip->PCIO, 0x3D5);
    if(Lock) cr11 |= 0x80;
    else cr11 &= ~0x80;
    VGA_WR08(chip->PCIO, 0x3D5, cr11);
}

static void nv3LockUnlock
(
    RIVA_HW_INST *chip,
    Bool           Lock
)
{
    VGA_WR08(chip->PVIO, 0x3C4, 0x06);
    VGA_WR08(chip->PVIO, 0x3C5, Lock ? 0x99 : 0x57);
    vgaLockUnlock(chip, Lock);
}
static void nv4LockUnlock
(
    RIVA_HW_INST *chip,
    Bool           Lock
)
{
    VGA_WR08(chip->PCIO, 0x3D4, 0x1F);
    VGA_WR08(chip->PCIO, 0x3D5, Lock ? 0x99 : 0x57);
    vgaLockUnlock(chip, Lock);
}
static int ShowHideCursor
(
    RIVA_HW_INST *chip,
    int           ShowHide
)
{
    int current;
    current                     =  chip->CurrentState->cursor1;
    chip->CurrentState->cursor1 = (chip->CurrentState->cursor1 & 0xFE) |
	                          (ShowHide & 0x01);
    VGA_WR08(chip->PCIO, 0x3D4, 0x31);
    VGA_WR08(chip->PCIO, 0x3D5, chip->CurrentState->cursor1);
    return (current & 0x01);
}

/****************************************************************************\
*                                                                            *
* The video arbitration routines calculate some "magic" numbers.  Fixes      *
* the snow seen when accessing the framebuffer without it.                   *
* It just works (I hope).                                                    *
*                                                                            *
\****************************************************************************/

#define DEFAULT_GR_LWM 100
#define DEFAULT_VID_LWM 100
#define DEFAULT_GR_BURST_SIZE 256
#define DEFAULT_VID_BURST_SIZE 128
#define VIDEO		0
#define GRAPHICS	1
#define MPORT		2
#define ENGINE		3
#define GFIFO_SIZE	320
#define GFIFO_SIZE_128	256
#define MFIFO_SIZE	120
#define VFIFO_SIZE	256
#define	ABS(a)	(a>0?a:-a)
typedef struct {
  int gdrain_rate;
  int vdrain_rate;
  int mdrain_rate;
  int gburst_size;
  int vburst_size;
  char vid_en;
  char gr_en;
  int wcmocc, wcgocc, wcvocc, wcvlwm, wcglwm;
  int by_gfacc;
  char vid_only_once;
  char gr_only_once;
  char first_vacc;
  char first_gacc;
  char first_macc;
  int vocc;
  int gocc;
  int mocc;
  char cur;
  char engine_en;
  char converged;
  int priority;
} nv3_arb_info;
typedef struct {
  int graphics_lwm;
  int video_lwm;
  int graphics_burst_size;
  int video_burst_size;
  int graphics_hi_priority;
  int media_hi_priority;
  int rtl_values;
  int valid;
} nv3_fifo_info;
typedef struct {
  char pix_bpp;
  char enable_video;
  char gr_during_vid;
  char enable_mp;
  int memory_width;
  int video_scale;
  int pclk_khz;
  int mclk_khz;
  int mem_page_miss;
  int mem_latency;
  char mem_aligned;
} nv3_sim_state;
typedef struct {
  int graphics_lwm;
  int video_lwm;
  int graphics_burst_size;
  int video_burst_size;
  int valid;
} nv4_fifo_info;
typedef struct {
  int pclk_khz;
  int mclk_khz;
  int nvclk_khz;
  char mem_page_miss;
  char mem_latency;
  int memory_width;
  char enable_video;
  char gr_during_vid;
  char pix_bpp;
  char mem_aligned;
  char enable_mp;
} nv4_sim_state;
typedef struct {
  int graphics_lwm;
  int video_lwm;
  int graphics_burst_size;
  int video_burst_size;
  int valid;
} nv10_fifo_info;
typedef struct {
  int pclk_khz;
  int mclk_khz;
  int nvclk_khz;
  char mem_page_miss;
  char mem_latency;
  int memory_type;
  int memory_width;
  char enable_video;
  char gr_during_vid;
  char pix_bpp;
  char mem_aligned;
  char enable_mp;
} nv10_sim_state;
static int nv3_iterate(nv3_fifo_info *res_info, nv3_sim_state * state, nv3_arb_info *ainfo)
{
    int iter = 0;
    int tmp;
    int vfsize, mfsize, gfsize;
    int mburst_size = 32;
    int mmisses, gmisses, vmisses;
    int misses;
    int vlwm, glwm, mlwm;
    int last, next, cur;
    int max_gfsize ;
    long ns;

    vlwm = 0;
    glwm = 0;
    mlwm = 0;
    vfsize = 0;
    gfsize = 0;
    cur = ainfo->cur;
    mmisses = 2;
    gmisses = 2;
    vmisses = 2;
    if (ainfo->gburst_size == 128) max_gfsize = GFIFO_SIZE_128;
    else  max_gfsize = GFIFO_SIZE;
    max_gfsize = GFIFO_SIZE;
    while (1)
    {
        if (ainfo->vid_en)
        {
            if (ainfo->wcvocc > ainfo->vocc) ainfo->wcvocc = ainfo->vocc;
            if (ainfo->wcvlwm > vlwm) ainfo->wcvlwm = vlwm ;
            ns = 1000000 * ainfo->vburst_size/(state->memory_width/8)/state->mclk_khz;
            vfsize = ns * ainfo->vdrain_rate / 1000000;
            vfsize =  ainfo->wcvlwm - ainfo->vburst_size + vfsize;
        }
        if (state->enable_mp)
        {
            if (ainfo->wcmocc > ainfo->mocc) ainfo->wcmocc = ainfo->mocc;
        }
        if (ainfo->gr_en)
        {
            if (ainfo->wcglwm > glwm) ainfo->wcglwm = glwm ;
            if (ainfo->wcgocc > ainfo->gocc) ainfo->wcgocc = ainfo->gocc;
            ns = 1000000 * (ainfo->gburst_size/(state->memory_width/8))/state->mclk_khz;
            gfsize = (ns * (long) ainfo->gdrain_rate)/1000000;
            gfsize = ainfo->wcglwm - ainfo->gburst_size + gfsize;
        }
        mfsize = 0;
        if (!state->gr_during_vid && ainfo->vid_en)
            if (ainfo->vid_en && (ainfo->vocc < 0) && !ainfo->vid_only_once)
                next = VIDEO;
            else if (ainfo->mocc < 0)
                next = MPORT;
            else if (ainfo->gocc< ainfo->by_gfacc)
                next = GRAPHICS;
            else return (0);
        else switch (ainfo->priority)
            {
                case VIDEO:
                    if (ainfo->vid_en && ainfo->vocc<0 && !ainfo->vid_only_once)
                        next = VIDEO;
                    else if (ainfo->gr_en && ainfo->gocc<0 && !ainfo->gr_only_once)
                        next = GRAPHICS;
                    else if (ainfo->mocc<0)
                        next = MPORT;
                    else    return (0);
                    break;
                case GRAPHICS:
                    if (ainfo->gr_en && ainfo->gocc<0 && !ainfo->gr_only_once)
                        next = GRAPHICS;
                    else if (ainfo->vid_en && ainfo->vocc<0 && !ainfo->vid_only_once)
                        next = VIDEO;
                    else if (ainfo->mocc<0)
                        next = MPORT;
                    else    return (0);
                    break;
                default:
                    if (ainfo->mocc<0)
                        next = MPORT;
                    else if (ainfo->gr_en && ainfo->gocc<0 && !ainfo->gr_only_once)
                        next = GRAPHICS;
                    else if (ainfo->vid_en && ainfo->vocc<0 && !ainfo->vid_only_once)
                        next = VIDEO;
                    else    return (0);
                    break;
            }
        last = cur;
        cur = next;
        iter++;
        switch (cur)
        {
            case VIDEO:
                if (last==cur)    misses = 0;
                else if (ainfo->first_vacc)   misses = vmisses;
                else    misses = 1;
                ainfo->first_vacc = 0;
                if (last!=cur)
                {
                    ns =  1000000 * (vmisses*state->mem_page_miss + state->mem_latency)/state->mclk_khz; 
                    vlwm = ns * ainfo->vdrain_rate/ 1000000;
                    vlwm = ainfo->vocc - vlwm;
                }
                ns = 1000000*(misses*state->mem_page_miss + ainfo->vburst_size)/(state->memory_width/8)/state->mclk_khz;
                ainfo->vocc = ainfo->vocc + ainfo->vburst_size - ns*ainfo->vdrain_rate/1000000;
                ainfo->gocc = ainfo->gocc - ns*ainfo->gdrain_rate/1000000;
                ainfo->mocc = ainfo->mocc - ns*ainfo->mdrain_rate/1000000;
                break;
            case GRAPHICS:
                if (last==cur)    misses = 0;
                else if (ainfo->first_gacc)   misses = gmisses;
                else    misses = 1;
                ainfo->first_gacc = 0;
                if (last!=cur)
                {
                    ns = 1000000*(gmisses*state->mem_page_miss + state->mem_latency)/state->mclk_khz ;
                    glwm = ns * ainfo->gdrain_rate/1000000;
                    glwm = ainfo->gocc - glwm;
                }
                ns = 1000000*(misses*state->mem_page_miss + ainfo->gburst_size/(state->memory_width/8))/state->mclk_khz;
                ainfo->vocc = ainfo->vocc + 0 - ns*ainfo->vdrain_rate/1000000;
                ainfo->gocc = ainfo->gocc + ainfo->gburst_size - ns*ainfo->gdrain_rate/1000000;
                ainfo->mocc = ainfo->mocc + 0 - ns*ainfo->mdrain_rate/1000000;
                break;
            default:
                if (last==cur)    misses = 0;
                else if (ainfo->first_macc)   misses = mmisses;
                else    misses = 1;
                ainfo->first_macc = 0;
                ns = 1000000*(misses*state->mem_page_miss + mburst_size/(state->memory_width/8))/state->mclk_khz;
                ainfo->vocc = ainfo->vocc + 0 - ns*ainfo->vdrain_rate/1000000;
                ainfo->gocc = ainfo->gocc + 0 - ns*ainfo->gdrain_rate/1000000;
                ainfo->mocc = ainfo->mocc + mburst_size - ns*ainfo->mdrain_rate/1000000;
                break;
        }
        if (iter>100)
        {
            ainfo->converged = 0;
            return (1);
        }
        ns = 1000000*ainfo->gburst_size/(state->memory_width/8)/state->mclk_khz;
        tmp = ns * ainfo->gdrain_rate/1000000;
        if (ABS(ainfo->gburst_size) + ((ABS(ainfo->wcglwm) + 16 ) & ~0x7) - tmp > max_gfsize)
        {
            ainfo->converged = 0;
            return (1);
        }
        ns = 1000000*ainfo->vburst_size/(state->memory_width/8)/state->mclk_khz;
        tmp = ns * ainfo->vdrain_rate/1000000;
        if (ABS(ainfo->vburst_size) + (ABS(ainfo->wcvlwm + 32) & ~0xf)  - tmp> VFIFO_SIZE)
        {
            ainfo->converged = 0;
            return (1);
        }
        if (ABS(ainfo->gocc) > max_gfsize)
        {
            ainfo->converged = 0;
            return (1);
        }
        if (ABS(ainfo->vocc) > VFIFO_SIZE)
        {
            ainfo->converged = 0;
            return (1);
        }
        if (ABS(ainfo->mocc) > MFIFO_SIZE)
        {
            ainfo->converged = 0;
            return (1);
        }
        if (ABS(vfsize) > VFIFO_SIZE)
        {
            ainfo->converged = 0;
            return (1);
        }
        if (ABS(gfsize) > max_gfsize)
        {
            ainfo->converged = 0;
            return (1);
        }
        if (ABS(mfsize) > MFIFO_SIZE)
        {
            ainfo->converged = 0;
            return (1);
        }
    }
}
static char nv3_arb(nv3_fifo_info * res_info, nv3_sim_state * state,  nv3_arb_info *ainfo) 
{
    long ens, vns, mns, gns;
    int mmisses, gmisses, vmisses, eburst_size, mburst_size;
    int refresh_cycle;

    refresh_cycle = 0;
    refresh_cycle = 2*(state->mclk_khz/state->pclk_khz) + 5;
    mmisses = 2;
    if (state->mem_aligned) gmisses = 2;
    else    gmisses = 3;
    vmisses = 2;
    eburst_size = state->memory_width * 1;
    mburst_size = 32;
    gns = 1000000 * (gmisses*state->mem_page_miss + state->mem_latency)/state->mclk_khz;
    ainfo->by_gfacc = gns*ainfo->gdrain_rate/1000000;
    ainfo->wcmocc = 0;
    ainfo->wcgocc = 0;
    ainfo->wcvocc = 0;
    ainfo->wcvlwm = 0;
    ainfo->wcglwm = 0;
    ainfo->engine_en = 1;
    ainfo->converged = 1;
    if (ainfo->engine_en)
    {
        ens =  1000000*(state->mem_page_miss + eburst_size/(state->memory_width/8) +refresh_cycle)/state->mclk_khz;
        ainfo->mocc = state->enable_mp ? 0-ens*ainfo->mdrain_rate/1000000 : 0;
        ainfo->vocc = ainfo->vid_en ? 0-ens*ainfo->vdrain_rate/1000000 : 0;
        ainfo->gocc = ainfo->gr_en ? 0-ens*ainfo->gdrain_rate/1000000 : 0;
        ainfo->cur = ENGINE;
        ainfo->first_vacc = 1;
        ainfo->first_gacc = 1;
        ainfo->first_macc = 1;
        nv3_iterate(res_info, state,ainfo);
    }
    if (state->enable_mp)
    {
        mns = 1000000 * (mmisses*state->mem_page_miss + mburst_size/(state->memory_width/8) + refresh_cycle)/state->mclk_khz;
        ainfo->mocc = state->enable_mp ? 0 : mburst_size - mns*ainfo->mdrain_rate/1000000;
        ainfo->vocc = ainfo->vid_en ? 0 : 0- mns*ainfo->vdrain_rate/1000000;
        ainfo->gocc = ainfo->gr_en ? 0: 0- mns*ainfo->gdrain_rate/1000000;
        ainfo->cur = MPORT;
        ainfo->first_vacc = 1;
        ainfo->first_gacc = 1;
        ainfo->first_macc = 0;
        nv3_iterate(res_info, state,ainfo);
    }
    if (ainfo->gr_en)
    {
        ainfo->first_vacc = 1;
        ainfo->first_gacc = 0;
        ainfo->first_macc = 1;
        gns = 1000000*(gmisses*state->mem_page_miss + ainfo->gburst_size/(state->memory_width/8) + refresh_cycle)/state->mclk_khz;
        ainfo->gocc = ainfo->gburst_size - gns*ainfo->gdrain_rate/1000000;
        ainfo->vocc = ainfo->vid_en? 0-gns*ainfo->vdrain_rate/1000000 : 0;
        ainfo->mocc = state->enable_mp ?  0-gns*ainfo->mdrain_rate/1000000: 0;
        ainfo->cur = GRAPHICS;
        nv3_iterate(res_info, state,ainfo);
    }
    if (ainfo->vid_en)
    {
        ainfo->first_vacc = 0;
        ainfo->first_gacc = 1;
        ainfo->first_macc = 1;
        vns = 1000000*(vmisses*state->mem_page_miss + ainfo->vburst_size/(state->memory_width/8) + refresh_cycle)/state->mclk_khz;
        ainfo->vocc = ainfo->vburst_size - vns*ainfo->vdrain_rate/1000000;
        ainfo->gocc = ainfo->gr_en? (0-vns*ainfo->gdrain_rate/1000000) : 0;
        ainfo->mocc = state->enable_mp? 0-vns*ainfo->mdrain_rate/1000000 :0 ;
        ainfo->cur = VIDEO;
        nv3_iterate(res_info, state, ainfo);
    }
    if (ainfo->converged)
    {
        res_info->graphics_lwm = (int)ABS(ainfo->wcglwm) + 16;
        res_info->video_lwm = (int)ABS(ainfo->wcvlwm) + 32;
        res_info->graphics_burst_size = ainfo->gburst_size;
        res_info->video_burst_size = ainfo->vburst_size;
        res_info->graphics_hi_priority = (ainfo->priority == GRAPHICS);
        res_info->media_hi_priority = (ainfo->priority == MPORT);
        if (res_info->video_lwm > 160)
        {
            res_info->graphics_lwm = 256;
            res_info->video_lwm = 128;
            res_info->graphics_burst_size = 64;
            res_info->video_burst_size = 64;
            res_info->graphics_hi_priority = 0;
            res_info->media_hi_priority = 0;
            ainfo->converged = 0;
            return (0);
        }
        if (res_info->video_lwm > 128)
        {
            res_info->video_lwm = 128;
        }
        return (1);
    }
    else
    {
        res_info->graphics_lwm = 256;
        res_info->video_lwm = 128;
        res_info->graphics_burst_size = 64;
        res_info->video_burst_size = 64;
        res_info->graphics_hi_priority = 0;
        res_info->media_hi_priority = 0;
        return (0);
    }
}
static char nv3_get_param(nv3_fifo_info *res_info, nv3_sim_state * state, nv3_arb_info *ainfo)
{
    int done, g,v, p;
    
    done = 0;
    for (p=0; p < 2; p++)
    {
        for (g=128 ; g > 32; g= g>> 1)
        {
            for (v=128; v >=32; v = v>> 1)
            {
                ainfo->priority = p;
                ainfo->gburst_size = g;     
                ainfo->vburst_size = v;
                done = nv3_arb(res_info, state,ainfo);
                if (done && (g==128))
                    if ((res_info->graphics_lwm + g) > 256)
                        done = 0;
                if (done)
                    goto Done;
            }
        }
    }

 Done:
    return done;
}
static void nv3CalcArbitration 
(
    nv3_fifo_info * res_info,
    nv3_sim_state * state
)
{
    nv3_fifo_info save_info;
    nv3_arb_info ainfo;
    char   res_gr, res_vid;

    ainfo.gr_en = 1;
    ainfo.vid_en = state->enable_video;
    ainfo.vid_only_once = 0;
    ainfo.gr_only_once = 0;
    ainfo.gdrain_rate = (int) state->pclk_khz * (state->pix_bpp/8);
    ainfo.vdrain_rate = (int) state->pclk_khz * 2;
    if (state->video_scale != 0)
        ainfo.vdrain_rate = ainfo.vdrain_rate/state->video_scale;
    ainfo.mdrain_rate = 33000;
    res_info->rtl_values = 0;
    if (!state->gr_during_vid && state->enable_video)
    {
        ainfo.gr_only_once = 1;
        ainfo.gr_en = 1;
        ainfo.gdrain_rate = 0;
        res_vid = nv3_get_param(res_info, state,  &ainfo);
        res_vid = ainfo.converged;
        save_info.video_lwm = res_info->video_lwm;
        save_info.video_burst_size = res_info->video_burst_size;
        ainfo.vid_en = 1;
        ainfo.vid_only_once = 1;
        ainfo.gr_en = 1;
        ainfo.gdrain_rate = (int) state->pclk_khz * (state->pix_bpp/8);
        ainfo.vdrain_rate = 0;
        res_gr = nv3_get_param(res_info, state,  &ainfo);
        res_gr = ainfo.converged;
        res_info->video_lwm = save_info.video_lwm;
        res_info->video_burst_size = save_info.video_burst_size;
        res_info->valid = res_gr & res_vid;
    }
    else
    {
        if (!ainfo.gr_en) ainfo.gdrain_rate = 0;
        if (!ainfo.vid_en) ainfo.vdrain_rate = 0;
        res_gr = nv3_get_param(res_info, state,  &ainfo);
        res_info->valid = ainfo.converged;
    }
}
static void nv3UpdateArbitrationSettings
(
    unsigned      VClk, 
    unsigned      pixelDepth, 
    unsigned     *burst,
    unsigned     *lwm,
    RIVA_HW_INST *chip
)
{
    nv3_fifo_info fifo_data;
    nv3_sim_state sim_data;
    unsigned int M, N, P, pll, MClk;
    
    pll = chip->PRAMDAC0[0x00000504/4];
    M = (pll >> 0) & 0xFF; N = (pll >> 8) & 0xFF; P = (pll >> 16) & 0x0F;
    MClk = (N * chip->CrystalFreqKHz / M) >> P;
    sim_data.pix_bpp        = (char)pixelDepth;
    sim_data.enable_video   = 0;
    sim_data.enable_mp      = 0;
    sim_data.video_scale    = 1;
    sim_data.memory_width   = (chip->PEXTDEV[0x00000000/4] & 0x10) ? 128 : 64;
    sim_data.memory_width   = 128;

    sim_data.mem_latency    = 9;
    sim_data.mem_aligned    = 1;
    sim_data.mem_page_miss  = 11;
    sim_data.gr_during_vid  = 0;
    sim_data.pclk_khz       = VClk;
    sim_data.mclk_khz       = MClk;
    nv3CalcArbitration(&fifo_data, &sim_data);
    if (fifo_data.valid)
    {
        int  b = fifo_data.graphics_burst_size >> 4;
        *burst = 0;
        while (b >>= 1) (*burst)++;
        *lwm   = fifo_data.graphics_lwm >> 3;
    }
    else
    {
        *lwm   = 0x24;
        *burst = 0x2;
    }
}
static void nv4CalcArbitration 
(
    nv4_fifo_info *fifo,
    nv4_sim_state *arb
)
{
    int data, pagemiss, cas,width, video_enable, color_key_enable, bpp, align;
    int nvclks, mclks, pclks, vpagemiss, crtpagemiss, vbs;
    int found, mclk_extra, mclk_loop, cbs, m1, p1;
    int mclk_freq, pclk_freq, nvclk_freq, mp_enable;
    int us_m, us_n, us_p, video_drain_rate, crtc_drain_rate;
    int vpm_us, us_video, vlwm, video_fill_us, cpm_us, us_crt,clwm;
    int craw, vraw;

    fifo->valid = 1;
    pclk_freq = arb->pclk_khz;
    mclk_freq = arb->mclk_khz;
    nvclk_freq = arb->nvclk_khz;
    pagemiss = arb->mem_page_miss;
    cas = arb->mem_latency;
    width = arb->memory_width >> 6;
    video_enable = arb->enable_video;
    color_key_enable = arb->gr_during_vid;
    bpp = arb->pix_bpp;
    align = arb->mem_aligned;
    mp_enable = arb->enable_mp;
    clwm = 0;
    vlwm = 0;
    cbs = 128;
    pclks = 2;
    nvclks = 2;
    nvclks += 2;
    nvclks += 1;
    mclks = 5;
    mclks += 3;
    mclks += 1;
    mclks += cas;
    mclks += 1;
    mclks += 1;
    mclks += 1;
    mclks += 1;
    mclk_extra = 3;
    nvclks += 2;
    nvclks += 1;
    nvclks += 1;
    nvclks += 1;
    if (mp_enable)
        mclks+=4;
    nvclks += 0;
    pclks += 0;
    found = 0;
    vbs = 0;
    while (found != 1)
    {
        fifo->valid = 1;
        found = 1;
        mclk_loop = mclks+mclk_extra;
        us_m = mclk_loop *1000*1000 / mclk_freq;
        us_n = nvclks*1000*1000 / nvclk_freq;
        us_p = nvclks*1000*1000 / pclk_freq;
        if (video_enable)
        {
            video_drain_rate = pclk_freq * 2;
            crtc_drain_rate = pclk_freq * bpp/8;
            vpagemiss = 2;
            vpagemiss += 1;
            crtpagemiss = 2;
            vpm_us = (vpagemiss * pagemiss)*1000*1000/mclk_freq;
            if (nvclk_freq * 2 > mclk_freq * width)
                video_fill_us = cbs*1000*1000 / 16 / nvclk_freq ;
            else
                video_fill_us = cbs*1000*1000 / (8 * width) / mclk_freq;
            us_video = vpm_us + us_m + us_n + us_p + video_fill_us;
            vlwm = us_video * video_drain_rate/(1000*1000);
            vlwm++;
            vbs = 128;
            if (vlwm > 128) vbs = 64;
            if (vlwm > (256-64)) vbs = 32;
            if (nvclk_freq * 2 > mclk_freq * width)
                video_fill_us = vbs *1000*1000/ 16 / nvclk_freq ;
            else
                video_fill_us = vbs*1000*1000 / (8 * width) / mclk_freq;
            cpm_us = crtpagemiss  * pagemiss *1000*1000/ mclk_freq;
            us_crt =
            us_video
            +video_fill_us
            +cpm_us
            +us_m + us_n +us_p
            ;
            clwm = us_crt * crtc_drain_rate/(1000*1000);
            clwm++;
        }
        else
        {
            crtc_drain_rate = pclk_freq * bpp/8;
            crtpagemiss = 2;
            crtpagemiss += 1;
            cpm_us = crtpagemiss  * pagemiss *1000*1000/ mclk_freq;
            us_crt =  cpm_us + us_m + us_n + us_p ;
            clwm = us_crt * crtc_drain_rate/(1000*1000);
            clwm++;
        }
        m1 = clwm + cbs - 512;
        p1 = m1 * pclk_freq / mclk_freq;
        p1 = p1 * bpp / 8;
        if ((p1 < m1) && (m1 > 0))
        {
            fifo->valid = 0;
            found = 0;
            if (mclk_extra ==0)   found = 1;
            mclk_extra--;
        }
        else if (video_enable)
        {
            if ((clwm > 511) || (vlwm > 255))
            {
                fifo->valid = 0;
                found = 0;
                if (mclk_extra ==0)   found = 1;
                mclk_extra--;
            }
        }
        else
        {
            if (clwm > 519)
            {
                fifo->valid = 0;
                found = 0;
                if (mclk_extra ==0)   found = 1;
                mclk_extra--;
            }
        }
        craw = clwm;
        vraw = vlwm;
        if (clwm < 384) clwm = 384;
        if (vlwm < 128) vlwm = 128;
        data = (int)(clwm);
        fifo->graphics_lwm = data;
        fifo->graphics_burst_size = 128;
        data = (int)((vlwm+15));
        fifo->video_lwm = data;
        fifo->video_burst_size = vbs;
    }
}
static void nv4UpdateArbitrationSettings
(
    unsigned      VClk, 
    unsigned      pixelDepth, 
    unsigned     *burst,
    unsigned     *lwm,
    RIVA_HW_INST *chip
)
{
    nv4_fifo_info fifo_data;
    nv4_sim_state sim_data;
    unsigned int M, N, P, pll, MClk, NVClk, cfg1;

    pll = chip->PRAMDAC0[0x00000504/4];
    M = (pll >> 0)  & 0xFF; N = (pll >> 8)  & 0xFF; P = (pll >> 16) & 0x0F;
    MClk  = (N * chip->CrystalFreqKHz / M) >> P;
    pll = chip->PRAMDAC0[0x00000500/4];
    M = (pll >> 0)  & 0xFF; N = (pll >> 8)  & 0xFF; P = (pll >> 16) & 0x0F;
    NVClk  = (N * chip->CrystalFreqKHz / M) >> P;
    cfg1 = chip->PFB[0x00000204/4];
    sim_data.pix_bpp        = (char)pixelDepth;
    sim_data.enable_video   = 0;
    sim_data.enable_mp      = 0;
    sim_data.memory_width   = (chip->PEXTDEV[0x00000000/4] & 0x10) ? 128 : 64;
    sim_data.mem_latency    = (char)cfg1 & 0x0F;
    sim_data.mem_aligned    = 1;
    sim_data.mem_page_miss  = (char)(((cfg1 >> 4) &0x0F) + ((cfg1 >> 31) & 0x01));
    sim_data.gr_during_vid  = 0;
    sim_data.pclk_khz       = VClk;
    sim_data.mclk_khz       = MClk;
    sim_data.nvclk_khz      = NVClk;
    nv4CalcArbitration(&fifo_data, &sim_data);
    if (fifo_data.valid)
    {
        int  b = fifo_data.graphics_burst_size >> 4;
        *burst = 0;
        while (b >>= 1) (*burst)++;
        *lwm   = fifo_data.graphics_lwm >> 3;
    }
}
static void nv10CalcArbitration 
(
    nv10_fifo_info *fifo,
    nv10_sim_state *arb
)
{
    int data, pagemiss, cas,width, video_enable, color_key_enable, bpp, align;
    int nvclks, mclks, pclks, vpagemiss, crtpagemiss, vbs;
    int nvclk_fill, us_extra;
    int found, mclk_extra, mclk_loop, cbs, m1;
    int mclk_freq, pclk_freq, nvclk_freq, mp_enable;
    int us_m, us_m_min, us_n, us_p, video_drain_rate, crtc_drain_rate;
    int vus_m, vus_n, vus_p;
    int vpm_us, us_video, vlwm, cpm_us, us_crt,clwm;
    int clwm_rnd_down;
    int craw, m2us, us_pipe, us_pipe_min, vus_pipe, p1clk, p2;
    int pclks_2_top_fifo, min_mclk_extra;
    int us_min_mclk_extra;

    fifo->valid = 1;
    pclk_freq = arb->pclk_khz; /* freq in KHz */
    mclk_freq = arb->mclk_khz;
    nvclk_freq = arb->nvclk_khz;
    pagemiss = arb->mem_page_miss;
    cas = arb->mem_latency;
    width = arb->memory_width/64;
    video_enable = arb->enable_video;
    color_key_enable = arb->gr_during_vid;
    bpp = arb->pix_bpp;
    align = arb->mem_aligned;
    mp_enable = arb->enable_mp;
    clwm = 0;
    vlwm = 1024;

    cbs = 512;
    vbs = 512;

    pclks = 4; /* lwm detect. */

    nvclks = 3; /* lwm -> sync. */
    nvclks += 2; /* fbi bus cycles (1 req + 1 busy) */

    mclks  = 1;   /* 2 edge sync.  may be very close to edge so just put one. */

    mclks += 1;   /* arb_hp_req */
    mclks += 5;   /* ap_hp_req   tiling pipeline */

    mclks += 2;    /* tc_req     latency fifo */
    mclks += 2;    /* fb_cas_n_  memory request to fbio block */
    mclks += 7;    /* sm_d_rdv   data returned from fbio block */

    /* fb.rd.d.Put_gc   need to accumulate 256 bits for read */
    if (arb->memory_type == 0)
      if (arb->memory_width == 64) /* 64 bit bus */
        mclks += 4;
      else
        mclks += 2;
    else
      if (arb->memory_width == 64) /* 64 bit bus */
        mclks += 2;
      else
        mclks += 1;

    if ((!video_enable) && (arb->memory_width == 128))
    {  
      mclk_extra = (bpp == 32) ? 31 : 42; /* Margin of error */
      min_mclk_extra = 17;
    }
    else
    {
      mclk_extra = (bpp == 32) ? 8 : 4; /* Margin of error */
      /* mclk_extra = 4; */ /* Margin of error */
      min_mclk_extra = 18;
    }

    nvclks += 1; /* 2 edge sync.  may be very close to edge so just put one. */
    nvclks += 1; /* fbi_d_rdv_n */
    nvclks += 1; /* Fbi_d_rdata */
    nvclks += 1; /* crtfifo load */

    if(mp_enable)
      mclks+=4; /* Mp can get in with a burst of 8. */
    /* Extra clocks determined by heuristics */

    nvclks += 0;
    pclks += 0;
    found = 0;
    while(found != 1) {
      fifo->valid = 1;
      found = 1;
      mclk_loop = mclks+mclk_extra;
      us_m = mclk_loop *1000*1000 / mclk_freq; /* Mclk latency in us */
      us_m_min = mclks * 1000*1000 / mclk_freq; /* Minimum Mclk latency in us */
      us_min_mclk_extra = min_mclk_extra *1000*1000 / mclk_freq;
      us_n = nvclks*1000*1000 / nvclk_freq;/* nvclk latency in us */
      us_p = pclks*1000*1000 / pclk_freq;/* nvclk latency in us */
      us_pipe = us_m + us_n + us_p;
      us_pipe_min = us_m_min + us_n + us_p;
      us_extra = 0;

      vus_m = mclk_loop *1000*1000 / mclk_freq; /* Mclk latency in us */
      vus_n = (4)*1000*1000 / nvclk_freq;/* nvclk latency in us */
      vus_p = 0*1000*1000 / pclk_freq;/* pclk latency in us */
      vus_pipe = vus_m + vus_n + vus_p;

      if(video_enable) {
        video_drain_rate = pclk_freq * 4; /* MB/s */
        crtc_drain_rate = pclk_freq * bpp/8; /* MB/s */

        vpagemiss = 1; /* self generating page miss */
        vpagemiss += 1; /* One higher priority before */

        crtpagemiss = 2; /* self generating page miss */
        if(mp_enable)
            crtpagemiss += 1; /* if MA0 conflict */

        vpm_us = (vpagemiss * pagemiss)*1000*1000/mclk_freq;

        us_video = vpm_us + vus_m; /* Video has separate read return path */

        cpm_us = crtpagemiss  * pagemiss *1000*1000/ mclk_freq;
        us_crt =
          us_video  /* Wait for video */
          +cpm_us /* CRT Page miss */
          +us_m + us_n +us_p /* other latency */
          ;

        clwm = us_crt * crtc_drain_rate/(1000*1000);
        clwm++; /* fixed point <= float_point - 1.  Fixes that */
      } else {
        crtc_drain_rate = pclk_freq * bpp/8; /* bpp * pclk/8 */

        crtpagemiss = 1; /* self generating page miss */
        crtpagemiss += 1; /* MA0 page miss */
        if(mp_enable)
            crtpagemiss += 1; /* if MA0 conflict */
        cpm_us = crtpagemiss  * pagemiss *1000*1000/ mclk_freq;
        us_crt =  cpm_us + us_m + us_n + us_p ;
        clwm = us_crt * crtc_drain_rate/(1000*1000);
        clwm++; /* fixed point <= float_point - 1.  Fixes that */

  /*
          //
          // Another concern, only for high pclks so don't do this
          // with video:
          // What happens if the latency to fetch the cbs is so large that
          // fifo empties.  In that case we need to have an alternate clwm value
          // based off the total burst fetch
          //
          us_crt = (cbs * 1000 * 1000)/ (8*width)/mclk_freq ;
          us_crt = us_crt + us_m + us_n + us_p + (4 * 1000 * 1000)/mclk_freq;
          clwm_mt = us_crt * crtc_drain_rate/(1000*1000);
          clwm_mt ++;
          if(clwm_mt > clwm)
              clwm = clwm_mt;
  */
          /* Finally, a heuristic check when width == 64 bits */
          if(width == 1){
              nvclk_fill = nvclk_freq * 8;
              if(crtc_drain_rate * 100 >= nvclk_fill * 102)
                      clwm = 0xfff; /*Large number to fail */

              else if(crtc_drain_rate * 100  >= nvclk_fill * 98) {
                  clwm = 1024;
                  cbs = 512;
                  us_extra = (cbs * 1000 * 1000)/ (8*width)/mclk_freq ;
              }
          }
      }


      /*
        Overfill check:

        */

      clwm_rnd_down = ((int)clwm/8)*8;
      if (clwm_rnd_down < clwm)
          clwm += 8;

      m1 = clwm + cbs -  1024; /* Amount of overfill */
      m2us = us_pipe_min + us_min_mclk_extra;
      pclks_2_top_fifo = (1024-clwm)/(8*width);

      /* pclk cycles to drain */
      p1clk = m2us * pclk_freq/(1000*1000); 
      p2 = p1clk * bpp / 8; /* bytes drained. */

      if((p2 < m1) && (m1 > 0)) {
          fifo->valid = 0;
          found = 0;
          if(min_mclk_extra == 0)   {
            if(cbs <= 32) {
              found = 1; /* Can't adjust anymore! */
            } else {
              cbs = cbs/2;  /* reduce the burst size */
            }
          } else {
            min_mclk_extra--;
          }
      } else {
        if (clwm > 1023){ /* Have some margin */
          fifo->valid = 0;
          found = 0;
          if(min_mclk_extra == 0)   
              found = 1; /* Can't adjust anymore! */
          else 
              min_mclk_extra--;
        }
      }
      craw = clwm;

      if(clwm < (1024-cbs+8)) clwm = 1024-cbs+8;
      data = (int)(clwm);
      /*  printf("CRT LWM: %f bytes, prog: 0x%x, bs: 256\n", clwm, data ); */
      fifo->graphics_lwm = data;   fifo->graphics_burst_size = cbs;

      /*  printf("VID LWM: %f bytes, prog: 0x%x, bs: %d\n, ", vlwm, data, vbs ); */
      fifo->video_lwm = 1024;  fifo->video_burst_size = 512;
    }
}
static void nv10UpdateArbitrationSettings
(
    unsigned      VClk, 
    unsigned      pixelDepth, 
    unsigned     *burst,
    unsigned     *lwm,
    RIVA_HW_INST *chip
)
{
    nv10_fifo_info fifo_data;
    nv10_sim_state sim_data;
    unsigned int M, N, P, pll, MClk, NVClk, cfg1;

    pll = chip->PRAMDAC0[0x00000504/4];
    M = (pll >> 0)  & 0xFF; N = (pll >> 8)  & 0xFF; P = (pll >> 16) & 0x0F;
    MClk  = (N * chip->CrystalFreqKHz / M) >> P;
    pll = chip->PRAMDAC0[0x00000500/4];
    M = (pll >> 0)  & 0xFF; N = (pll >> 8)  & 0xFF; P = (pll >> 16) & 0x0F;
    NVClk  = (N * chip->CrystalFreqKHz / M) >> P;
    cfg1 = chip->PFB[0x00000204/4];
    sim_data.pix_bpp        = (char)pixelDepth;
    sim_data.enable_video   = 0;
    sim_data.enable_mp      = 0;
    sim_data.memory_type    = (chip->PFB[0x00000200/4] & 0x01) ? 1 : 0;
    sim_data.memory_width   = (chip->PEXTDEV[0x00000000/4] & 0x10) ? 128 : 64;
    sim_data.mem_latency    = (char)cfg1 & 0x0F;
    sim_data.mem_aligned    = 1;
    sim_data.mem_page_miss  = (char)(((cfg1 >> 4) &0x0F) + ((cfg1 >> 31) & 0x01));
    sim_data.gr_during_vid  = 0;
    sim_data.pclk_khz       = VClk;
    sim_data.mclk_khz       = MClk;
    sim_data.nvclk_khz      = NVClk;
    nv10CalcArbitration(&fifo_data, &sim_data);
    if (fifo_data.valid)
    {
        int  b = fifo_data.graphics_burst_size >> 4;
        *burst = 0;
        while (b >>= 1) (*burst)++;
        *lwm   = fifo_data.graphics_lwm >> 3;
    }
}

static void nForceUpdateArbitrationSettings
(
    unsigned      VClk,
    unsigned      pixelDepth,
    unsigned     *burst,
    unsigned     *lwm,
    RIVA_HW_INST *chip
)
{
    nv10_fifo_info fifo_data;
    nv10_sim_state sim_data;
    unsigned int M, N, P, pll, MClk, NVClk;
    unsigned int uMClkPostDiv, memctrl;

    uMClkPostDiv = (pciReadLong(pciTag(0, 0, 3), 0x6C) >> 8) & 0xf;
    if(!uMClkPostDiv) uMClkPostDiv = 4; 
    MClk = 400000 / uMClkPostDiv;

    pll = chip->PRAMDAC0[0x00000500/4];
    M = (pll >> 0)  & 0xFF; N = (pll >> 8)  & 0xFF; P = (pll >> 16) & 0x0F;
    NVClk  = (N * chip->CrystalFreqKHz / M) >> P;
    sim_data.pix_bpp        = (char)pixelDepth;
    sim_data.enable_video   = 0;
    sim_data.enable_mp      = 0;
    sim_data.memory_type    = (pciReadLong(pciTag(0, 0, 1), 0x7C) >> 12) & 1;
    sim_data.memory_width   = 64;

    memctrl = pciReadLong(pciTag(0, 0, 3), 0x00) >> 16;

    if((memctrl == 0x1A9) || (memctrl == 0x1AB) || (memctrl == 0x1ED)) {
        int dimm[3];

        dimm[0] = (pciReadLong(pciTag(0, 0, 2), 0x40) >> 8) & 0x4F;
        dimm[1] = (pciReadLong(pciTag(0, 0, 2), 0x44) >> 8) & 0x4F;
        dimm[2] = (pciReadLong(pciTag(0, 0, 2), 0x48) >> 8) & 0x4F;

        if((dimm[0] + dimm[1]) != dimm[2]) {
             ErrorF("WARNING: "
              "your nForce DIMMs are not arranged in optimal banks!\n");
        } 
    }

    sim_data.mem_latency    = 3;
    sim_data.mem_aligned    = 1;
    sim_data.mem_page_miss  = 10;
    sim_data.gr_during_vid  = 0;
    sim_data.pclk_khz       = VClk;
    sim_data.mclk_khz       = MClk;
    sim_data.nvclk_khz      = NVClk;
    nv10CalcArbitration(&fifo_data, &sim_data);
    if (fifo_data.valid)
    {
        int  b = fifo_data.graphics_burst_size >> 4;
        *burst = 0;
        while (b >>= 1) (*burst)++;
        *lwm   = fifo_data.graphics_lwm >> 3;
    }
}


/****************************************************************************\
*                                                                            *
*                          RIVA Mode State Routines                          *
*                                                                            *
\****************************************************************************/

/*
 * Calculate the Video Clock parameters for the PLL.
 */
static int CalcVClock
(
    int           clockIn,
    int          *clockOut,
    int          *mOut,
    int          *nOut,
    int          *pOut,
    RIVA_HW_INST *chip
)
{
    unsigned lowM, highM, highP;
    unsigned DeltaNew, DeltaOld;
    unsigned VClk, Freq;
    unsigned M, N, P;
    
    DeltaOld = 0xFFFFFFFF;

    VClk     = (unsigned)clockIn;
    
    if (chip->CrystalFreqKHz == 13500)
    {
        lowM  = 7;
        highM = 13 - (chip->Architecture == NV_ARCH_03);
    }                      
    else
    {
        lowM  = 8;
        highM = 14 - (chip->Architecture == NV_ARCH_03);
    }

    highP = 4 - (chip->Architecture == NV_ARCH_03);
    for (P = 0; P <= highP; P ++)
    {
        Freq = VClk << P;
        if ((Freq >= 128000) && (Freq <= chip->MaxVClockFreqKHz))
        {
            for (M = lowM; M <= highM; M++)
            {
                N    = (VClk << P) * M / chip->CrystalFreqKHz;
                if(N <= 255) {
                    Freq = (chip->CrystalFreqKHz * N / M) >> P;
                    if (Freq > VClk)
                        DeltaNew = Freq - VClk;
                    else
                        DeltaNew = VClk - Freq;
                    if (DeltaNew < DeltaOld)
                    {
                        *mOut     = M;
                        *nOut     = N;
                        *pOut     = P;
                        *clockOut = Freq;
                        DeltaOld  = DeltaNew;
                    }
                }
            }
        }
    }
    return (DeltaOld != 0xFFFFFFFF);
}
/*
 * Calculate extended mode parameters (SVGA) and save in a 
 * mode state structure.
 */
static void CalcStateExt
(
    RIVA_HW_INST  *chip,
    RIVA_HW_STATE *state,
    int            bpp,
    int            width,
    int            hDisplaySize,
    int            height,
    int            dotClock,
    int		   flags 
)
{
    int pixelDepth, VClk, m, n, p;
    /*
     * Save mode parameters.
     */
    state->bpp    = bpp;    /* this is not bitsPerPixel, it's 8,15,16,32 */
    state->width  = width;
    state->height = height;
    /*
     * Extended RIVA registers.
     */
    pixelDepth = (bpp + 1)/8;
    CalcVClock(dotClock, &VClk, &m, &n, &p, chip);

    switch (chip->Architecture)
    {
        case NV_ARCH_03:
            nv3UpdateArbitrationSettings(VClk, 
                                         pixelDepth * 8, 
                                        &(state->arbitration0),
                                        &(state->arbitration1),
                                         chip);
            state->cursor0  = 0x00;
            state->cursor1  = 0x78;
	    if (flags & V_DBLSCAN)
		state->cursor1 |= 2;
            state->cursor2  = 0x00000000;
            state->pllsel   = 0x10010100;
            state->config   = ((width + 31)/32)
                            | (((pixelDepth > 2) ? 3 : pixelDepth) << 8)
                            | 0x1000;
            state->general  = 0x00100100;
            state->repaint1 = hDisplaySize < 1280 ? 0x06 : 0x02;
            break;
        case NV_ARCH_04:
            nv4UpdateArbitrationSettings(VClk, 
                                         pixelDepth * 8, 
                                        &(state->arbitration0),
                                        &(state->arbitration1),
                                         chip);
            state->cursor0  = 0x00;
            state->cursor1  = 0xFC;
	    if (flags & V_DBLSCAN)
		state->cursor1 |= 2;
            state->cursor2  = 0x00000000;
            state->pllsel   = 0x10000700;
            state->config   = 0x00001114;
            state->general  = bpp == 16 ? 0x00101100 : 0x00100100;
            state->repaint1 = hDisplaySize < 1280 ? 0x04 : 0x00;
            break;
        case NV_ARCH_10:
        case NV_ARCH_20:
            if(((chip->Chipset & 0xffff) == 0x01A0) ||
               ((chip->Chipset & 0xffff) == 0x01f0))
            {
                nForceUpdateArbitrationSettings(VClk,
                                          pixelDepth * 8,
                                         &(state->arbitration0),
                                         &(state->arbitration1),
                                          chip);
            } else {
                nv10UpdateArbitrationSettings(VClk, 
                                          pixelDepth * 8, 
                                         &(state->arbitration0),
                                         &(state->arbitration1),
                                          chip);
            }
            state->cursor0  = 0x80 | (chip->CursorStart >> 17);
            state->cursor1  = (chip->CursorStart >> 11) << 2;
	    state->cursor2  = chip->CursorStart >> 24;
	    if (flags & V_DBLSCAN) 
		state->cursor1 |= 2;
            state->pllsel   = 0x10000700;
            state->config   = chip->PFB[0x00000200/4];
            state->general  = bpp == 16 ? 0x00101100 : 0x00100100;
            state->repaint1 = hDisplaySize < 1280 ? 0x04 : 0x00;
            break;
    }

    if((bpp != 8) && (chip->Architecture != NV_ARCH_03)) /* DirectColor */
	state->general |= 0x00000030;

    state->vpll     = (p << 16) | (n << 8) | m;
    state->repaint0 = (((width/8)*pixelDepth) & 0x700) >> 3;
    state->pixel    = pixelDepth > 2   ? 3    : pixelDepth;
    state->offset   = 0;
    state->pitch    = pixelDepth * width;
}
/*
 * Load fixed function state and pre-calculated/stored state.
 */
#define LOAD_FIXED_STATE(tbl,dev)                                       \
    for (i = 0; i < sizeof(tbl##Table##dev)/8; i++)                 \
        chip->dev[tbl##Table##dev[i][0]] = tbl##Table##dev[i][1]
#define LOAD_FIXED_STATE_8BPP(tbl,dev)                                  \
    for (i = 0; i < sizeof(tbl##Table##dev##_8BPP)/8; i++)            \
        chip->dev[tbl##Table##dev##_8BPP[i][0]] = tbl##Table##dev##_8BPP[i][1]
#define LOAD_FIXED_STATE_15BPP(tbl,dev)                                 \
    for (i = 0; i < sizeof(tbl##Table##dev##_15BPP)/8; i++)           \
        chip->dev[tbl##Table##dev##_15BPP[i][0]] = tbl##Table##dev##_15BPP[i][1]
#define LOAD_FIXED_STATE_16BPP(tbl,dev)                                 \
    for (i = 0; i < sizeof(tbl##Table##dev##_16BPP)/8; i++)           \
        chip->dev[tbl##Table##dev##_16BPP[i][0]] = tbl##Table##dev##_16BPP[i][1]
#define LOAD_FIXED_STATE_32BPP(tbl,dev)                                 \
    for (i = 0; i < sizeof(tbl##Table##dev##_32BPP)/8; i++)           \
        chip->dev[tbl##Table##dev##_32BPP[i][0]] = tbl##Table##dev##_32BPP[i][1]
static void UpdateFifoState
(
    RIVA_HW_INST  *chip
)
{
    int i;

    switch (chip->Architecture)
    {
        case NV_ARCH_04:
            LOAD_FIXED_STATE(nv4,FIFO);
            break;
        case NV_ARCH_10:
        case NV_ARCH_20:
            LOAD_FIXED_STATE(nv10,FIFO);
            break;
    }
}
static void LoadStateExt
(
    RIVA_HW_INST  *chip,
    RIVA_HW_STATE *state
)
{
    int i, format;

    /*
     * Load HW fixed function state.
     */
    LOAD_FIXED_STATE(Riva,PMC);
    LOAD_FIXED_STATE(Riva,PTIMER);
    switch (chip->Architecture)
    {
        case NV_ARCH_03:
            /*
             * Make sure frame buffer config gets set before loading PRAMIN.
             */
            chip->PFB[0x00000200/4] = state->config;
            LOAD_FIXED_STATE(nv3,PFIFO);
            LOAD_FIXED_STATE(nv3,PRAMIN);
            LOAD_FIXED_STATE(nv3,PGRAPH);
            switch (state->bpp)
            {
                case 15:
                case 16:
                    LOAD_FIXED_STATE_15BPP(nv3,PRAMIN);
                    LOAD_FIXED_STATE_15BPP(nv3,PGRAPH);
                    break;
                case 24:
                case 32:
                    LOAD_FIXED_STATE_32BPP(nv3,PRAMIN);
                    LOAD_FIXED_STATE_32BPP(nv3,PGRAPH);
                    break;
                case 8:
                default:
                    LOAD_FIXED_STATE_8BPP(nv3,PRAMIN);
                    LOAD_FIXED_STATE_8BPP(nv3,PGRAPH);
                    break;
            }
            for (i = 0x00000; i < 0x00800; i++)
                chip->PRAMIN[0x00000502 + i] = (i << 12) | 0x03;
            chip->PGRAPH[0x00000630/4] = state->offset;
            chip->PGRAPH[0x00000634/4] = state->offset;
            chip->PGRAPH[0x00000638/4] = state->offset;
            chip->PGRAPH[0x0000063C/4] = state->offset;
            chip->PGRAPH[0x00000650/4] = state->pitch;
            chip->PGRAPH[0x00000654/4] = state->pitch;
            chip->PGRAPH[0x00000658/4] = state->pitch;
            chip->PGRAPH[0x0000065C/4] = state->pitch;
            break;
        case NV_ARCH_04:
            /*
             * Make sure frame buffer config gets set before loading PRAMIN.
             */
            chip->PFB[0x00000200/4] = state->config;
            LOAD_FIXED_STATE(nv4,PFIFO);
            LOAD_FIXED_STATE(nv4,PRAMIN);
            LOAD_FIXED_STATE(nv4,PGRAPH);
            switch (state->bpp)
            {
                case 15:
                    LOAD_FIXED_STATE_15BPP(nv4,PRAMIN);
                    LOAD_FIXED_STATE_15BPP(nv4,PGRAPH);
                    break;
                case 16:
                    LOAD_FIXED_STATE_16BPP(nv4,PRAMIN);
                    LOAD_FIXED_STATE_16BPP(nv4,PGRAPH);
                    break;
                case 24:
                case 32:
                    LOAD_FIXED_STATE_32BPP(nv4,PRAMIN);
                    LOAD_FIXED_STATE_32BPP(nv4,PGRAPH);
                    break;
                case 8:
                default:
                    LOAD_FIXED_STATE_8BPP(nv4,PRAMIN);
                    LOAD_FIXED_STATE_8BPP(nv4,PGRAPH);
                    break;
            }
            chip->PGRAPH[0x00000640/4] = state->offset;
            chip->PGRAPH[0x00000644/4] = state->offset;
            chip->PGRAPH[0x00000648/4] = state->offset;
            chip->PGRAPH[0x0000064C/4] = state->offset;
            chip->PGRAPH[0x00000670/4] = state->pitch;
            chip->PGRAPH[0x00000674/4] = state->pitch;
            chip->PGRAPH[0x00000678/4] = state->pitch;
            chip->PGRAPH[0x0000067C/4] = state->pitch;
            break;
        case NV_ARCH_10:
        case NV_ARCH_20:
            if(chip->twoHeads) {
               VGA_WR08(chip->PCIO, 0x03D4, 0x44);
               VGA_WR08(chip->PCIO, 0x03D5, state->crtcOwner);
               chip->LockUnlock(chip, 0);
            }

            LOAD_FIXED_STATE(nv10,PFIFO);
            LOAD_FIXED_STATE(nv10,PRAMIN);
            LOAD_FIXED_STATE(nv10,PGRAPH);
            switch (state->bpp)
            {
                case 15:
                    format = 2;
                    LOAD_FIXED_STATE_15BPP(nv10,PRAMIN);
                    LOAD_FIXED_STATE_15BPP(nv10,PGRAPH);
                    break;
                case 16:
                    format = 5;
                    LOAD_FIXED_STATE_16BPP(nv10,PRAMIN);
                    LOAD_FIXED_STATE_16BPP(nv10,PGRAPH);
                    break;
                case 32:
                    format = 7;
                    LOAD_FIXED_STATE_32BPP(nv10,PRAMIN);
                    LOAD_FIXED_STATE_32BPP(nv10,PGRAPH);
                    break;
                default:
                    format = 1;
                    LOAD_FIXED_STATE_8BPP(nv10,PRAMIN);
                    LOAD_FIXED_STATE_8BPP(nv10,PGRAPH);
                    break;
            }

	    if(chip->Architecture == NV_ARCH_10) {
                chip->PGRAPH[0x00000640/4] = state->offset;
                chip->PGRAPH[0x00000644/4] = state->offset;
                chip->PGRAPH[0x00000648/4] = state->offset;
                chip->PGRAPH[0x0000064C/4] = state->offset;
                chip->PGRAPH[0x00000670/4] = state->pitch;
                chip->PGRAPH[0x00000674/4] = state->pitch;
                chip->PGRAPH[0x00000678/4] = state->pitch;
                chip->PGRAPH[0x0000067C/4] = state->pitch;
                chip->PGRAPH[0x00000680/4] = state->pitch;
	    } else {
                chip->PGRAPH[0x00000864/4] = 0x01ffffff;
                chip->PGRAPH[0x00000868/4] = 0x01ffffff;
                chip->PGRAPH[0x0000086c/4] = 0x01ffffff;
                chip->PGRAPH[0x00000870/4] = 0x01ffffff;

                chip->PGRAPH[0x00000820/4] = state->offset;
                chip->PGRAPH[0x00000824/4] = state->offset;
                chip->PGRAPH[0x00000828/4] = state->offset;
                chip->PGRAPH[0x0000082C/4] = state->offset;
                chip->PGRAPH[0x00000850/4] = state->pitch;
                chip->PGRAPH[0x00000854/4] = state->pitch;
                chip->PGRAPH[0x00000858/4] = state->pitch;
                chip->PGRAPH[0x0000085C/4] = state->pitch;
                chip->PGRAPH[0x000009A4/4] = chip->PFB[0x00000200/4]; 
                chip->PGRAPH[0x000009A8/4] = chip->PFB[0x00000204/4];

                if((chip->Chipset & 0x0ff0) >= 0x0300) {
                    if(!chip->flatPanel) {
                       chip->PRAMDAC0[0x0578/4] = state->vpllB;
                       chip->PRAMDAC0[0x057C/4] = state->vpll2B;
                    }
                    chip->PGRAPH[0x00000724/4] = format | (format << 5);
                    chip->PGRAPH[0x0000008C/4] |= 1;
                    chip->PGRAPH[0x00000890/4] |= 0x00040000;
                }
	    }
            if(chip->twoHeads) {
               chip->PCRTC0[0x00000860/4] = state->head;
               chip->PCRTC0[0x00002860/4] = state->head2;
            }
            chip->PRAMDAC[0x00000404/4] |= (1 << 25);

	    chip->PMC[0x00008704/4] = 1;
	    chip->PMC[0x00008140/4] = 0;
	    chip->PMC[0x00008920/4] = 0;
	    chip->PMC[0x00008924/4] = 0;
	    chip->PMC[0x00008908/4] = 0x01ffffff;
	    chip->PMC[0x0000890C/4] = 0x01ffffff;
            chip->PMC[0x00001588/4] = 0;

            chip->PFB[0x00000240/4] = 0;
            chip->PFB[0x00000250/4] = 0;
            chip->PFB[0x00000260/4] = 0;
            chip->PFB[0x00000270/4] = 0;
            chip->PFB[0x00000280/4] = 0;
            chip->PFB[0x00000290/4] = 0;
            chip->PFB[0x000002A0/4] = 0;
            chip->PFB[0x000002B0/4] = 0;

            chip->PGRAPH[0x00000B00/4] = chip->PFB[0x00000240/4];
            chip->PGRAPH[0x00000B04/4] = chip->PFB[0x00000244/4];
            chip->PGRAPH[0x00000B08/4] = chip->PFB[0x00000248/4];
            chip->PGRAPH[0x00000B0C/4] = chip->PFB[0x0000024C/4];
            chip->PGRAPH[0x00000B10/4] = chip->PFB[0x00000250/4];
            chip->PGRAPH[0x00000B14/4] = chip->PFB[0x00000254/4];
            chip->PGRAPH[0x00000B18/4] = chip->PFB[0x00000258/4];
            chip->PGRAPH[0x00000B1C/4] = chip->PFB[0x0000025C/4];
            chip->PGRAPH[0x00000B20/4] = chip->PFB[0x00000260/4];
            chip->PGRAPH[0x00000B24/4] = chip->PFB[0x00000264/4];
            chip->PGRAPH[0x00000B28/4] = chip->PFB[0x00000268/4];
            chip->PGRAPH[0x00000B2C/4] = chip->PFB[0x0000026C/4];
            chip->PGRAPH[0x00000B30/4] = chip->PFB[0x00000270/4];
            chip->PGRAPH[0x00000B34/4] = chip->PFB[0x00000274/4];
            chip->PGRAPH[0x00000B38/4] = chip->PFB[0x00000278/4];
            chip->PGRAPH[0x00000B3C/4] = chip->PFB[0x0000027C/4];
            chip->PGRAPH[0x00000B40/4] = chip->PFB[0x00000280/4];
            chip->PGRAPH[0x00000B44/4] = chip->PFB[0x00000284/4];
            chip->PGRAPH[0x00000B48/4] = chip->PFB[0x00000288/4];
            chip->PGRAPH[0x00000B4C/4] = chip->PFB[0x0000028C/4];
            chip->PGRAPH[0x00000B50/4] = chip->PFB[0x00000290/4];
            chip->PGRAPH[0x00000B54/4] = chip->PFB[0x00000294/4];
            chip->PGRAPH[0x00000B58/4] = chip->PFB[0x00000298/4];
            chip->PGRAPH[0x00000B5C/4] = chip->PFB[0x0000029C/4];
            chip->PGRAPH[0x00000B60/4] = chip->PFB[0x000002A0/4];
            chip->PGRAPH[0x00000B64/4] = chip->PFB[0x000002A4/4];
            chip->PGRAPH[0x00000B68/4] = chip->PFB[0x000002A8/4];
            chip->PGRAPH[0x00000B6C/4] = chip->PFB[0x000002AC/4];
            chip->PGRAPH[0x00000B70/4] = chip->PFB[0x000002B0/4];
            chip->PGRAPH[0x00000B74/4] = chip->PFB[0x000002B4/4];
            chip->PGRAPH[0x00000B78/4] = chip->PFB[0x000002B8/4];
            chip->PGRAPH[0x00000B7C/4] = chip->PFB[0x000002BC/4];
            chip->PGRAPH[0x00000F40/4] = 0x10000000;
            chip->PGRAPH[0x00000F44/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00000040;
            chip->PGRAPH[0x00000F54/4] = 0x00000008;
            chip->PGRAPH[0x00000F50/4] = 0x00000200;
            for (i = 0; i < (3*16); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00000040;
            chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00000800;
            for (i = 0; i < (16*16); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F40/4] = 0x30000000;
            chip->PGRAPH[0x00000F44/4] = 0x00000004;
            chip->PGRAPH[0x00000F50/4] = 0x00006400;
            for (i = 0; i < (59*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00006800;
            for (i = 0; i < (47*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00006C00;
            for (i = 0; i < (3*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00007000;
            for (i = 0; i < (19*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00007400;
            for (i = 0; i < (12*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00007800;
            for (i = 0; i < (12*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00004400;
            for (i = 0; i < (8*4); i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00000000;
            for (i = 0; i < 16; i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;
            chip->PGRAPH[0x00000F50/4] = 0x00000040;
            for (i = 0; i < 4; i++)
                chip->PGRAPH[0x00000F54/4] = 0x00000000;

            chip->PCRTC[0x00000810/4] = state->cursorConfig;

            if(chip->flatPanel) {
               if((chip->Chipset & 0x0ff0) == 0x0110) {
                   chip->PRAMDAC[0x0528/4] = state->dither;
               } else 
               if((chip->Chipset & 0x0ff0) >= 0x0170) {
                   chip->PRAMDAC[0x083C/4] = state->dither;
               }


               VGA_WR08(chip->PCIO, 0x03D4, 0x53);
               VGA_WR08(chip->PCIO, 0x03D5, 0);
               VGA_WR08(chip->PCIO, 0x03D4, 0x54);
               VGA_WR08(chip->PCIO, 0x03D5, 0);
               VGA_WR08(chip->PCIO, 0x03D4, 0x21);
               VGA_WR08(chip->PCIO, 0x03D5, 0xfa);
            }

            VGA_WR08(chip->PCIO, 0x03D4, 0x41);
            VGA_WR08(chip->PCIO, 0x03D5, state->extra);
    }

    LOAD_FIXED_STATE(Riva,FIFO);
    UpdateFifoState(chip);

    /*
     * Load HW mode state.
     */
    VGA_WR08(chip->PCIO, 0x03D4, 0x19);
    VGA_WR08(chip->PCIO, 0x03D5, state->repaint0);
    VGA_WR08(chip->PCIO, 0x03D4, 0x1A);
    VGA_WR08(chip->PCIO, 0x03D5, state->repaint1);
    VGA_WR08(chip->PCIO, 0x03D4, 0x25);
    VGA_WR08(chip->PCIO, 0x03D5, state->screen);
    VGA_WR08(chip->PCIO, 0x03D4, 0x28);
    VGA_WR08(chip->PCIO, 0x03D5, state->pixel);
    VGA_WR08(chip->PCIO, 0x03D4, 0x2D);
    VGA_WR08(chip->PCIO, 0x03D5, state->horiz);
    VGA_WR08(chip->PCIO, 0x03D4, 0x1B);
    VGA_WR08(chip->PCIO, 0x03D5, state->arbitration0);
    VGA_WR08(chip->PCIO, 0x03D4, 0x20);
    VGA_WR08(chip->PCIO, 0x03D5, state->arbitration1);
    VGA_WR08(chip->PCIO, 0x03D4, 0x30);
    VGA_WR08(chip->PCIO, 0x03D5, state->cursor0);
    VGA_WR08(chip->PCIO, 0x03D4, 0x31);
    VGA_WR08(chip->PCIO, 0x03D5, state->cursor1);
    VGA_WR08(chip->PCIO, 0x03D4, 0x2F);
    VGA_WR08(chip->PCIO, 0x03D5, state->cursor2);
    VGA_WR08(chip->PCIO, 0x03D4, 0x39);
    VGA_WR08(chip->PCIO, 0x03D5, state->interlace);

    if(!chip->flatPanel) {
       chip->PRAMDAC0[0x00000508/4] = state->vpll;
       chip->PRAMDAC0[0x0000050C/4] = state->pllsel;
       if(chip->twoHeads)
          chip->PRAMDAC0[0x00000520/4] = state->vpll2;
    } else {
       chip->PRAMDAC[0x00000848/4]  = state->scale;
    }
    chip->PRAMDAC[0x00000600/4]  = state->general;

    /*
     * Turn off VBlank enable and reset.
     */
    chip->PCRTC[0x00000140/4] = 0;
    chip->PCRTC[0x00000100/4] = chip->VBlankBit;
    /*
     * Set interrupt enable.
     */    
    chip->PMC[0x00000140/4]  = chip->EnableIRQ & 0x01;
    /*
     * Set current state pointer.
     */
    chip->CurrentState = state;
    /*
     * Reset FIFO free and empty counts.
     */
    chip->FifoFreeCount  = 0;
    /* Free count from first subchannel */
    chip->FifoEmptyCount = chip->Rop->FifoFree; 
}

static void UnloadStateExt
(
    RIVA_HW_INST  *chip,
    RIVA_HW_STATE *state
)
{
    /*
     * Save current HW state.
     */
    VGA_WR08(chip->PCIO, 0x03D4, 0x19);
    state->repaint0     = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x1A);
    state->repaint1     = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x25);
    state->screen       = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x28);
    state->pixel        = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x2D);
    state->horiz        = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x1B);
    state->arbitration0 = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x20);
    state->arbitration1 = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x30);
    state->cursor0      = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x31);
    state->cursor1      = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x2F);
    state->cursor2      = VGA_RD08(chip->PCIO, 0x03D5);
    VGA_WR08(chip->PCIO, 0x03D4, 0x39);
    state->interlace    = VGA_RD08(chip->PCIO, 0x03D5);
    state->vpll         = chip->PRAMDAC0[0x00000508/4];
    state->vpll2        = chip->PRAMDAC0[0x00000520/4];
    state->vpllB        = chip->PRAMDAC0[0x00000578/4];
    state->vpll2B       = chip->PRAMDAC0[0x0000057C/4];
    state->pllsel       = chip->PRAMDAC0[0x0000050C/4];
    state->general      = chip->PRAMDAC[0x00000600/4];
    state->scale        = chip->PRAMDAC[0x00000848/4];
    state->config       = chip->PFB[0x00000200/4];

    switch (chip->Architecture)
    {
        case NV_ARCH_03:
            state->offset   = chip->PGRAPH[0x00000630/4];
            state->pitch    = chip->PGRAPH[0x00000650/4];
            break;
        case NV_ARCH_04:
            state->offset   = chip->PGRAPH[0x00000640/4];
            state->pitch    = chip->PGRAPH[0x00000670/4];
            break;
        case NV_ARCH_10:
        case NV_ARCH_20:
            state->offset   = chip->PGRAPH[0x00000640/4];
            state->pitch    = chip->PGRAPH[0x00000670/4];
            if(chip->twoHeads) {
               state->head     = chip->PCRTC0[0x00000860/4];
               state->head2    = chip->PCRTC0[0x00002860/4];
               VGA_WR08(chip->PCIO, 0x03D4, 0x44);
               state->crtcOwner = VGA_RD08(chip->PCIO, 0x03D5);
            }
            VGA_WR08(chip->PCIO, 0x03D4, 0x41);
            state->extra = VGA_RD08(chip->PCIO, 0x03D5);
            state->cursorConfig = chip->PCRTC[0x00000810/4];

            if((chip->Chipset & 0x0ff0) == 0x0110) {
               state->dither = chip->PRAMDAC[0x0528/4];
            } else 
            if((chip->Chipset & 0x0ff0) >= 0x0170) {
               state->dither = chip->PRAMDAC[0x083C/4];
            }

            break;
    }
}
static void SetStartAddress
(
    RIVA_HW_INST *chip,
    unsigned      start
)
{
    chip->PCRTC[0x800/4] = start;
}

static void SetStartAddress3
(
    RIVA_HW_INST *chip,
    unsigned      start
)
{
    int offset = start >> 2;
    int pan    = (start & 3) << 1;
    unsigned char tmp;

    /*
     * Unlock extended registers.
     */
    chip->LockUnlock(chip, 0);
    /*
     * Set start address.
     */
    VGA_WR08(chip->PCIO, 0x3D4, 0x0D); VGA_WR08(chip->PCIO, 0x3D5, offset);
    offset >>= 8;
    VGA_WR08(chip->PCIO, 0x3D4, 0x0C); VGA_WR08(chip->PCIO, 0x3D5, offset);
    offset >>= 8;
    VGA_WR08(chip->PCIO, 0x3D4, 0x19); tmp = VGA_RD08(chip->PCIO, 0x3D5);
    VGA_WR08(chip->PCIO, 0x3D5, (offset & 0x01F) | (tmp & ~0x1F));
    VGA_WR08(chip->PCIO, 0x3D4, 0x2D); tmp = VGA_RD08(chip->PCIO, 0x3D5);
    VGA_WR08(chip->PCIO, 0x3D5, (offset & 0x60) | (tmp & ~0x60));
    /*
     * 4 pixel pan register.
     */
    offset = VGA_RD08(chip->PCIO, chip->IO + 0x0A);
    VGA_WR08(chip->PCIO, 0x3C0, 0x13);
    VGA_WR08(chip->PCIO, 0x3C0, pan);
}
/****************************************************************************\
*                                                                            *
*                      Probe RIVA Chip Configuration                         *
*                                                                            *
\****************************************************************************/

static void nv3GetConfig
(
    RIVA_HW_INST *chip
)
{
    /*
     * Fill in chip configuration.
     */
    if (chip->PFB[0x00000000/4] & 0x00000020)
    {
        if (((chip->PMC[0x00000000/4] & 0xF0) == 0x20)
         && ((chip->PMC[0x00000000/4] & 0x0F) >= 0x02))
        {        
            /*
             * SDRAM 128 ZX.
             */
            chip->RamBandwidthKBytesPerSec = 800000;
            switch (chip->PFB[0x00000000/4] & 0x03)
            {
                case 2:
                    chip->RamAmountKBytes = 1024 * 4;
                    break;
                case 1:
                    chip->RamAmountKBytes = 1024 * 2;
                    break;
                default:
                    chip->RamAmountKBytes = 1024 * 8;
                    break;
            }
        }            
        else            
        {
            chip->RamBandwidthKBytesPerSec = 1000000;
            chip->RamAmountKBytes          = 1024 * 8;
        }            
    }
    else
    {
        /*
         * SGRAM 128.
         */
        chip->RamBandwidthKBytesPerSec = 1000000;
        switch (chip->PFB[0x00000000/4] & 0x00000003)
        {
            case 0:
                chip->RamAmountKBytes = 1024 * 8;
                break;
            case 2:
                chip->RamAmountKBytes = 1024 * 4;
                break;
            default:
                chip->RamAmountKBytes = 1024 * 2;
                break;
        }
    }        
    chip->CrystalFreqKHz   = (chip->PEXTDEV[0x00000000/4] & 0x00000040) ? 14318 : 13500;
    chip->CURSOR           = &(chip->PRAMIN[0x00008000/4 - 0x0800/4]);
    chip->VBlankBit        = 0x00000100;
    chip->MaxVClockFreqKHz = 256000;
    /*
     * Set chip functions.
     */
    chip->Busy            = nv3Busy;
    chip->ShowHideCursor  = ShowHideCursor;
    chip->CalcStateExt    = CalcStateExt;
    chip->LoadStateExt    = LoadStateExt;
    chip->UnloadStateExt  = UnloadStateExt;
    chip->SetStartAddress = SetStartAddress3;
    chip->LockUnlock      = nv3LockUnlock;
}
static void nv4GetConfig
(
    RIVA_HW_INST *chip
)
{
    /*
     * Fill in chip configuration.
     */
    if (chip->PFB[0x00000000/4] & 0x00000100)
    {
        chip->RamAmountKBytes = ((chip->PFB[0x00000000/4] >> 12) & 0x0F) * 1024 * 2
                              + 1024 * 2;
    }
    else
    {
        switch (chip->PFB[0x00000000/4] & 0x00000003)
        {
            case 0:
                chip->RamAmountKBytes = 1024 * 32;
                break;
            case 1:
                chip->RamAmountKBytes = 1024 * 4;
                break;
            case 2:
                chip->RamAmountKBytes = 1024 * 8;
                break;
            case 3:
            default:
                chip->RamAmountKBytes = 1024 * 16;
                break;
        }
    }
    switch ((chip->PFB[0x00000000/4] >> 3) & 0x00000003)
    {
        case 3:
            chip->RamBandwidthKBytesPerSec = 800000;
            break;
        default:
            chip->RamBandwidthKBytesPerSec = 1000000;
            break;
    }
    chip->CrystalFreqKHz   = (chip->PEXTDEV[0x00000000/4] & 0x00000040) ? 14318 : 13500;
    chip->CURSOR           = &(chip->PRAMIN[0x00010000/4 - 0x0800/4]);
    chip->VBlankBit        = 0x00000001;
    chip->MaxVClockFreqKHz = 350000;
    /*
     * Set chip functions.
     */
    chip->Busy            = nv4Busy;
    chip->ShowHideCursor  = ShowHideCursor;
    chip->CalcStateExt    = CalcStateExt;
    chip->LoadStateExt    = LoadStateExt;
    chip->UnloadStateExt  = UnloadStateExt;
    chip->SetStartAddress = SetStartAddress;
    chip->LockUnlock      = nv4LockUnlock;
}
static void nv10GetConfig
(
    NVPtr pNv
)
{
    RIVA_HW_INST *chip = &pNv->riva;

#if X_BYTE_ORDER == X_BIG_ENDIAN
    /* turn on big endian register access */
    if(!(chip->PMC[0x00000004/4] & 0x01000001))
       chip->PMC[0x00000004/4] = 0x01000001;
#endif

    /*
     * Fill in chip configuration.
     */
    if((pNv->Chipset && 0xffff) == 0x01a0) {
	int amt = pciReadLong(pciTag(0, 0, 1), 0x7C);

        chip->RamAmountKBytes = (((amt >> 6) & 31) + 1) * 1024;
    } else if((pNv->Chipset & 0xffff) == 0x01f0) {
        int amt = pciReadLong(pciTag(0, 0, 1), 0x84);

        chip->RamAmountKBytes = (((amt >> 4) & 127) + 1) * 1024;
    } else {
      switch ((chip->PFB[0x0000020C/4] >> 20) & 0x000000FF)
      {
        case 0x02:
            chip->RamAmountKBytes = 1024 * 2;
            break;
        case 0x04:
            chip->RamAmountKBytes = 1024 * 4;
            break;
        case 0x08:
            chip->RamAmountKBytes = 1024 * 8;
            break;
        case 0x10:
            chip->RamAmountKBytes = 1024 * 16;
            break;
        case 0x20:
            chip->RamAmountKBytes = 1024 * 32;
            break;
        case 0x40:
            chip->RamAmountKBytes = 1024 * 64;
            break;
        case 0x80:
            chip->RamAmountKBytes = 1024 * 128;
            break;
        default:
            chip->RamAmountKBytes = 1024 * 16;
            break;
      }
    }
    switch ((chip->PFB[0x00000000/4] >> 3) & 0x00000003)
    {
        case 3:
            chip->RamBandwidthKBytesPerSec = 800000;
            break;
        default:
            chip->RamBandwidthKBytesPerSec = 1000000;
            break;
    }

    chip->CrystalFreqKHz = (chip->PEXTDEV[0x0000/4] & (1 << 6)) ? 14318 :
                                                                  13500;
    switch(pNv->Chipset & 0x0ff0) {
    case 0x0170:
    case 0x0180:
    case 0x01F0:
    case 0x0250:
    case 0x0280:
    case 0x0300:
    case 0x0310:
    case 0x0320:
    case 0x0330:
    case 0x0340:
       if(chip->PEXTDEV[0x0000/4] & (1 << 22))
           chip->CrystalFreqKHz = 27000;
       break;
    default:
       break;
    }

    chip->CursorStart      = (chip->RamAmountKBytes - 128) * 1024;
    chip->CURSOR           = NULL;  /* can't set this here */
    chip->VBlankBit        = 0x00000001;
    chip->MaxVClockFreqKHz = 350000;
    /*
     * Set chip functions.
     */
    chip->Busy            = nv10Busy;
    chip->ShowHideCursor  = ShowHideCursor;
    chip->CalcStateExt    = CalcStateExt;
    chip->LoadStateExt    = LoadStateExt;
    chip->UnloadStateExt  = UnloadStateExt;
    chip->SetStartAddress = SetStartAddress;
    chip->LockUnlock      = nv4LockUnlock;

    switch(pNv->Chipset & 0x0ff0) {
    case 0x0110:
    case 0x0170:
    case 0x0180:
    case 0x01F0:
    case 0x0250:
    case 0x0280:
    case 0x0300:
    case 0x0310:
    case 0x0320:
    case 0x0330:
    case 0x0340:
        chip->twoHeads = TRUE;
        break;
    default:
        chip->twoHeads = FALSE;
        break;
    }
}
int RivaGetConfig
(
    NVPtr pNv
)
{
    RIVA_HW_INST *chip = &pNv->riva;
    /*
     * Save this so future SW know whats it's dealing with.
     */
    chip->Version = RIVA_SW_VERSION;
    /*
     * Chip specific configuration.
     */
    switch (chip->Architecture)
    {
        case NV_ARCH_03:
            nv3GetConfig(chip);
            break;
        case NV_ARCH_04:
            nv4GetConfig(chip);
            break;
        case NV_ARCH_10:
        case NV_ARCH_20:
            nv10GetConfig(pNv);
            break;
        default:
            return (-1);
    }
    chip->Chipset = pNv->Chipset;
    /*
     * Fill in FIFO pointers.
     */
    chip->Rop    = (RivaRop                 *)&(chip->FIFO[0x00000000/4]);
    chip->Clip   = (RivaClip                *)&(chip->FIFO[0x00002000/4]);
    chip->Patt   = (RivaPattern             *)&(chip->FIFO[0x00004000/4]);
    chip->Pixmap = (RivaPixmap              *)&(chip->FIFO[0x00006000/4]);
    chip->Blt    = (RivaScreenBlt           *)&(chip->FIFO[0x00008000/4]);
    chip->Bitmap = (RivaBitmap              *)&(chip->FIFO[0x0000A000/4]);
    chip->Line   = (RivaLine                *)&(chip->FIFO[0x0000C000/4]);
    return (0);
}

