/* mga_state.c -- State support for MGA G200/G400 -*- linux-c -*-
 * Created: Thu Jan 27 02:53:43 2000 by jhartmann@precisioninsight.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Jeff Hartmann <jhartmann@valinux.com>
 *    Keith Whitwell <keith@tungstengraphics.com>
 *
 * Rewritten by:
 *    Gareth Hughes <gareth@valinux.com>
 */

#include "drmP.h"
#include "drm.h"
#include "mga_drm.h"
#include "mga_drv.h"

/* ================================================================
 * DMA hardware state programming functions
 */

static void mga_emit_clip_rect( drm_mga_private_t *dev_priv,
				drm_clip_rect_t *box )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;
	unsigned int pitch = dev_priv->front_pitch;
	DMA_LOCALS;

	BEGIN_DMA( 2 );

	/* Force reset of DWGCTL on G400 (eliminates clip disable bit).
	 */
	if ( dev_priv->chipset == MGA_CARD_TYPE_G400 ) {
		DMA_BLOCK( MGA_DWGCTL,		ctx->dwgctl,
			   MGA_LEN + MGA_EXEC,	0x80000000,
			   MGA_DWGCTL,		ctx->dwgctl,
			   MGA_LEN + MGA_EXEC,	0x80000000 );
	}
	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_CXBNDRY,	(box->x2 << 16) | box->x1,
		   MGA_YTOP,	box->y1 * pitch,
		   MGA_YBOT,	box->y2 * pitch );

	ADVANCE_DMA();
}

static __inline__ void mga_g200_emit_context( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;
	DMA_LOCALS;

	BEGIN_DMA( 3 );

	DMA_BLOCK( MGA_DSTORG,		ctx->dstorg,
		   MGA_MACCESS,		ctx->maccess,
		   MGA_PLNWT,		ctx->plnwt,
		   MGA_DWGCTL,		ctx->dwgctl );

	DMA_BLOCK( MGA_ALPHACTRL,	ctx->alphactrl,
		   MGA_FOGCOL,		ctx->fogcolor,
		   MGA_WFLAG,		ctx->wflag,
		   MGA_ZORG,		dev_priv->depth_offset );

	DMA_BLOCK( MGA_FCOL,		ctx->fcol,
		   MGA_DMAPAD,		0x00000000,
		   MGA_DMAPAD,		0x00000000,
		   MGA_DMAPAD,		0x00000000 );

	ADVANCE_DMA();
}

static __inline__ void mga_g400_emit_context( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;
	DMA_LOCALS;

	BEGIN_DMA( 4 );

	DMA_BLOCK( MGA_DSTORG,		ctx->dstorg,
		   MGA_MACCESS,		ctx->maccess,
		   MGA_PLNWT,		ctx->plnwt,
		   MGA_DWGCTL,		ctx->dwgctl );

	DMA_BLOCK( MGA_ALPHACTRL,	ctx->alphactrl,
		   MGA_FOGCOL,		ctx->fogcolor,
		   MGA_WFLAG,		ctx->wflag,
		   MGA_ZORG,		dev_priv->depth_offset );

	DMA_BLOCK( MGA_WFLAG1,		ctx->wflag,
		   MGA_TDUALSTAGE0,	ctx->tdualstage0,
		   MGA_TDUALSTAGE1,	ctx->tdualstage1,
		   MGA_FCOL,		ctx->fcol );

	DMA_BLOCK( MGA_STENCIL,		ctx->stencil,
		   MGA_STENCILCTL,	ctx->stencilctl,
		   MGA_DMAPAD,		0x00000000,
		   MGA_DMAPAD,		0x00000000 );

	ADVANCE_DMA();
}

static __inline__ void mga_g200_emit_tex0( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_texture_regs_t *tex = &sarea_priv->tex_state[0];
	DMA_LOCALS;

	BEGIN_DMA( 4 );

	DMA_BLOCK( MGA_TEXCTL2,		tex->texctl2,
		   MGA_TEXCTL,		tex->texctl,
		   MGA_TEXFILTER,	tex->texfilter,
		   MGA_TEXBORDERCOL,	tex->texbordercol );

	DMA_BLOCK( MGA_TEXORG,		tex->texorg,
		   MGA_TEXORG1,		tex->texorg1,
		   MGA_TEXORG2,		tex->texorg2,
		   MGA_TEXORG3,		tex->texorg3 );

	DMA_BLOCK( MGA_TEXORG4,		tex->texorg4,
		   MGA_TEXWIDTH,	tex->texwidth,
		   MGA_TEXHEIGHT,	tex->texheight,
		   MGA_WR24,		tex->texwidth );

	DMA_BLOCK( MGA_WR34,		tex->texheight,
		   MGA_TEXTRANS,	0x0000ffff,
		   MGA_TEXTRANSHIGH,	0x0000ffff,
		   MGA_DMAPAD,		0x00000000 );

	ADVANCE_DMA();
}

static __inline__ void mga_g400_emit_tex0( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_texture_regs_t *tex = &sarea_priv->tex_state[0];
	DMA_LOCALS;

/*  	printk("mga_g400_emit_tex0 %x %x %x\n", tex->texorg, */
/*  	       tex->texctl, tex->texctl2); */

	BEGIN_DMA( 6 );

	DMA_BLOCK( MGA_TEXCTL2,		tex->texctl2 | MGA_G400_TC2_MAGIC,
		   MGA_TEXCTL,		tex->texctl,
		   MGA_TEXFILTER,	tex->texfilter,
		   MGA_TEXBORDERCOL,	tex->texbordercol );

	DMA_BLOCK( MGA_TEXORG,		tex->texorg,
		   MGA_TEXORG1,		tex->texorg1,
		   MGA_TEXORG2,		tex->texorg2,
		   MGA_TEXORG3,		tex->texorg3 );

	DMA_BLOCK( MGA_TEXORG4,		tex->texorg4,
		   MGA_TEXWIDTH,	tex->texwidth,
		   MGA_TEXHEIGHT,	tex->texheight,
		   MGA_WR49,		0x00000000 );

	DMA_BLOCK( MGA_WR57,		0x00000000,
		   MGA_WR53,		0x00000000,
		   MGA_WR61,		0x00000000,
		   MGA_WR52,		MGA_G400_WR_MAGIC );

	DMA_BLOCK( MGA_WR60,		MGA_G400_WR_MAGIC,
		   MGA_WR54,		tex->texwidth | MGA_G400_WR_MAGIC,
		   MGA_WR62,		tex->texheight | MGA_G400_WR_MAGIC,
		   MGA_DMAPAD,		0x00000000 );

	DMA_BLOCK( MGA_DMAPAD,		0x00000000,
		   MGA_DMAPAD,		0x00000000,
		   MGA_TEXTRANS,	0x0000ffff,
		   MGA_TEXTRANSHIGH,	0x0000ffff );

	ADVANCE_DMA();
}

static __inline__ void mga_g400_emit_tex1( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_texture_regs_t *tex = &sarea_priv->tex_state[1];
	DMA_LOCALS;

/*  	printk("mga_g400_emit_tex1 %x %x %x\n", tex->texorg,  */
/*  	       tex->texctl, tex->texctl2); */

	BEGIN_DMA( 5 );

	DMA_BLOCK( MGA_TEXCTL2,		(tex->texctl2 |
					 MGA_MAP1_ENABLE |
					 MGA_G400_TC2_MAGIC),
		   MGA_TEXCTL,		tex->texctl,
		   MGA_TEXFILTER,	tex->texfilter,
		   MGA_TEXBORDERCOL,	tex->texbordercol );

	DMA_BLOCK( MGA_TEXORG,		tex->texorg,
		   MGA_TEXORG1,		tex->texorg1,
		   MGA_TEXORG2,		tex->texorg2,
		   MGA_TEXORG3,		tex->texorg3 );

	DMA_BLOCK( MGA_TEXORG4,		tex->texorg4,
		   MGA_TEXWIDTH,	tex->texwidth,
		   MGA_TEXHEIGHT,	tex->texheight,
		   MGA_WR49,		0x00000000 );

	DMA_BLOCK( MGA_WR57,		0x00000000,
		   MGA_WR53,		0x00000000,
		   MGA_WR61,		0x00000000,
		   MGA_WR52,		tex->texwidth | MGA_G400_WR_MAGIC );

	DMA_BLOCK( MGA_WR60,		tex->texheight | MGA_G400_WR_MAGIC,
		   MGA_TEXTRANS,	0x0000ffff,
		   MGA_TEXTRANSHIGH,	0x0000ffff,
		   MGA_TEXCTL2,		tex->texctl2 | MGA_G400_TC2_MAGIC );

	ADVANCE_DMA();
}

static __inline__ void mga_g200_emit_pipe( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	unsigned int pipe = sarea_priv->warp_pipe;
	DMA_LOCALS;

	BEGIN_DMA( 3 );

	DMA_BLOCK( MGA_WIADDR,	MGA_WMODE_SUSPEND,
		   MGA_WVRTXSZ,	0x00000007,
		   MGA_WFLAG,	0x00000000,
		   MGA_WR24,	0x00000000 );

	DMA_BLOCK( MGA_WR25,	0x00000100,
		   MGA_WR34,	0x00000000,
		   MGA_WR42,	0x0000ffff,
		   MGA_WR60,	0x0000ffff );

	/* Padding required to to hardware bug.
	 */
	DMA_BLOCK( MGA_DMAPAD,	0xffffffff,
		   MGA_DMAPAD,	0xffffffff,
		   MGA_DMAPAD,	0xffffffff,
		   MGA_WIADDR,	(dev_priv->warp_pipe_phys[pipe] |
				 MGA_WMODE_START |
				 MGA_WAGP_ENABLE) );

	ADVANCE_DMA();
}

static __inline__ void mga_g400_emit_pipe( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	unsigned int pipe = sarea_priv->warp_pipe;
	DMA_LOCALS;

/*  	printk("mga_g400_emit_pipe %x\n", pipe); */

	BEGIN_DMA( 10 );

	DMA_BLOCK( MGA_WIADDR2,	MGA_WMODE_SUSPEND,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000 );

	if ( pipe & MGA_T2 ) {
		DMA_BLOCK( MGA_WVRTXSZ,		0x00001e09,
			   MGA_DMAPAD,		0x00000000,
			   MGA_DMAPAD,		0x00000000,
			   MGA_DMAPAD,		0x00000000 );

		DMA_BLOCK( MGA_WACCEPTSEQ,	0x00000000,
			   MGA_WACCEPTSEQ,	0x00000000,
			   MGA_WACCEPTSEQ,	0x00000000,
			   MGA_WACCEPTSEQ,	0x1e000000 );
	} else {
		if ( dev_priv->warp_pipe & MGA_T2 ) {
			/* Flush the WARP pipe */
			DMA_BLOCK( MGA_YDST,		0x00000000,
				   MGA_FXLEFT,		0x00000000,
				   MGA_FXRIGHT,		0x00000001,
				   MGA_DWGCTL,		MGA_DWGCTL_FLUSH );

			DMA_BLOCK( MGA_LEN + MGA_EXEC,	0x00000001,
				   MGA_DWGSYNC,		0x00007000,
				   MGA_TEXCTL2,		MGA_G400_TC2_MAGIC,
				   MGA_LEN + MGA_EXEC,	0x00000000 );

			DMA_BLOCK( MGA_TEXCTL2,		(MGA_DUALTEX |
							 MGA_G400_TC2_MAGIC),
				   MGA_LEN + MGA_EXEC,	0x00000000,
				   MGA_TEXCTL2,		MGA_G400_TC2_MAGIC,
				   MGA_DMAPAD,		0x00000000 );
		}

		DMA_BLOCK( MGA_WVRTXSZ,		0x00001807,
			   MGA_DMAPAD,		0x00000000,
			   MGA_DMAPAD,		0x00000000,
			   MGA_DMAPAD,		0x00000000 );

		DMA_BLOCK( MGA_WACCEPTSEQ,	0x00000000,
			   MGA_WACCEPTSEQ,	0x00000000,
			   MGA_WACCEPTSEQ,	0x00000000,
			   MGA_WACCEPTSEQ,	0x18000000 );
	}

	DMA_BLOCK( MGA_WFLAG,	0x00000000,
		   MGA_WFLAG1,	0x00000000,
		   MGA_WR56,	MGA_G400_WR56_MAGIC,
		   MGA_DMAPAD,	0x00000000 );

	DMA_BLOCK( MGA_WR49,	0x00000000,		/* tex0              */
		   MGA_WR57,	0x00000000,		/* tex0              */
		   MGA_WR53,	0x00000000,		/* tex1              */
		   MGA_WR61,	0x00000000 );		/* tex1              */

	DMA_BLOCK( MGA_WR54,	MGA_G400_WR_MAGIC,	/* tex0 width        */
		   MGA_WR62,	MGA_G400_WR_MAGIC,	/* tex0 height       */
		   MGA_WR52,	MGA_G400_WR_MAGIC,	/* tex1 width        */
		   MGA_WR60,	MGA_G400_WR_MAGIC );	/* tex1 height       */

	/* Padding required to to hardware bug */
	DMA_BLOCK( MGA_DMAPAD,	0xffffffff,
		   MGA_DMAPAD,	0xffffffff,
		   MGA_DMAPAD,	0xffffffff,
		   MGA_WIADDR2,	(dev_priv->warp_pipe_phys[pipe] |
				 MGA_WMODE_START |
				 MGA_WAGP_ENABLE) );

	ADVANCE_DMA();
}

static void mga_g200_emit_state( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	unsigned int dirty = sarea_priv->dirty;

	if ( sarea_priv->warp_pipe != dev_priv->warp_pipe ) {
		mga_g200_emit_pipe( dev_priv );
		dev_priv->warp_pipe = sarea_priv->warp_pipe;
	}

	if ( dirty & MGA_UPLOAD_CONTEXT ) {
		mga_g200_emit_context( dev_priv );
		sarea_priv->dirty &= ~MGA_UPLOAD_CONTEXT;
	}

	if ( dirty & MGA_UPLOAD_TEX0 ) {
		mga_g200_emit_tex0( dev_priv );
		sarea_priv->dirty &= ~MGA_UPLOAD_TEX0;
	}
}

static void mga_g400_emit_state( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	unsigned int dirty = sarea_priv->dirty;
	int multitex = sarea_priv->warp_pipe & MGA_T2;

	if ( sarea_priv->warp_pipe != dev_priv->warp_pipe ) {
		mga_g400_emit_pipe( dev_priv );
		dev_priv->warp_pipe = sarea_priv->warp_pipe;
	}

	if ( dirty & MGA_UPLOAD_CONTEXT ) {
		mga_g400_emit_context( dev_priv );
		sarea_priv->dirty &= ~MGA_UPLOAD_CONTEXT;
	}

	if ( dirty & MGA_UPLOAD_TEX0 ) {
		mga_g400_emit_tex0( dev_priv );
		sarea_priv->dirty &= ~MGA_UPLOAD_TEX0;
	}

	if ( (dirty & MGA_UPLOAD_TEX1) && multitex ) {
		mga_g400_emit_tex1( dev_priv );
		sarea_priv->dirty &= ~MGA_UPLOAD_TEX1;
	}
}


/* ================================================================
 * SAREA state verification
 */

/* Disallow all write destinations except the front and backbuffer.
 */
static int mga_verify_context( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;

	if ( ctx->dstorg != dev_priv->front_offset &&
	     ctx->dstorg != dev_priv->back_offset ) {
		DRM_ERROR( "*** bad DSTORG: %x (front %x, back %x)\n\n",
			   ctx->dstorg, dev_priv->front_offset,
			   dev_priv->back_offset );
		ctx->dstorg = 0;
		return DRM_ERR(EINVAL);
	}

	return 0;
}

/* Disallow texture reads from PCI space.
 */
static int mga_verify_tex( drm_mga_private_t *dev_priv, int unit )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_texture_regs_t *tex = &sarea_priv->tex_state[unit];
	unsigned int org;

	org = tex->texorg & (MGA_TEXORGMAP_MASK | MGA_TEXORGACC_MASK);

	if ( org == (MGA_TEXORGMAP_SYSMEM | MGA_TEXORGACC_PCI) ) {
		DRM_ERROR( "*** bad TEXORG: 0x%x, unit %d\n",
			   tex->texorg, unit );
		tex->texorg = 0;
		return DRM_ERR(EINVAL);
	}

	return 0;
}

static int mga_verify_state( drm_mga_private_t *dev_priv )
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	unsigned int dirty = sarea_priv->dirty;
	int ret = 0;

	if ( sarea_priv->nbox > MGA_NR_SAREA_CLIPRECTS )
		sarea_priv->nbox = MGA_NR_SAREA_CLIPRECTS;

	if ( dirty & MGA_UPLOAD_CONTEXT )
		ret |= mga_verify_context( dev_priv );

	if ( dirty & MGA_UPLOAD_TEX0 )
		ret |= mga_verify_tex( dev_priv, 0 );

	if ( dev_priv->chipset == MGA_CARD_TYPE_G400 ) {
		if ( dirty & MGA_UPLOAD_TEX1 )
			ret |= mga_verify_tex( dev_priv, 1 );

		if ( dirty & MGA_UPLOAD_PIPE )
			ret |= ( sarea_priv->warp_pipe > MGA_MAX_G400_PIPES );
	} else {
		if ( dirty & MGA_UPLOAD_PIPE )
			ret |= ( sarea_priv->warp_pipe > MGA_MAX_G200_PIPES );
	}

	return ( ret == 0 );
}

static int mga_verify_iload( drm_mga_private_t *dev_priv,
			     unsigned int dstorg, unsigned int length )
{
	if ( dstorg < dev_priv->texture_offset ||
	     dstorg + length > (dev_priv->texture_offset +
				dev_priv->texture_size) ) {
		DRM_ERROR( "*** bad iload DSTORG: 0x%x\n", dstorg );
		return DRM_ERR(EINVAL);
	}

	if ( length & MGA_ILOAD_MASK ) {
		DRM_ERROR( "*** bad iload length: 0x%x\n",
			   length & MGA_ILOAD_MASK );
		return DRM_ERR(EINVAL);
	}

	return 0;
}

static int mga_verify_blit( drm_mga_private_t *dev_priv,
			    unsigned int srcorg, unsigned int dstorg )
{
	if ( (srcorg & 0x3) == (MGA_SRCACC_PCI | MGA_SRCMAP_SYSMEM) ||
	     (dstorg & 0x3) == (MGA_SRCACC_PCI | MGA_SRCMAP_SYSMEM) ) {
		DRM_ERROR( "*** bad blit: src=0x%x dst=0x%x\n",
			   srcorg, dstorg );
		return DRM_ERR(EINVAL);
	}
	return 0;
}


/* ================================================================
 *
 */

static void mga_dma_dispatch_clear( drm_device_t *dev,
				    drm_mga_clear_t *clear )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;
	drm_clip_rect_t *pbox = sarea_priv->boxes;
	int nbox = sarea_priv->nbox;
	int i;
	DMA_LOCALS;
	DRM_DEBUG( "\n" );

	BEGIN_DMA( 1 );

	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DWGSYNC,	0x00007100,
		   MGA_DWGSYNC,	0x00007000 );

	ADVANCE_DMA();

	for ( i = 0 ; i < nbox ; i++ ) {
		drm_clip_rect_t *box = &pbox[i];
		u32 height = box->y2 - box->y1;

		DRM_DEBUG( "   from=%d,%d to=%d,%d\n",
			   box->x1, box->y1, box->x2, box->y2 );

		if ( clear->flags & MGA_FRONT ) {
			BEGIN_DMA( 2 );

			DMA_BLOCK( MGA_DMAPAD,	0x00000000,
				   MGA_PLNWT,	clear->color_mask,
				   MGA_YDSTLEN, (box->y1 << 16) | height,
				   MGA_FXBNDRY, (box->x2 << 16) | box->x1 );

			DMA_BLOCK( MGA_DMAPAD,	0x00000000,
				   MGA_FCOL,	clear->clear_color,
				   MGA_DSTORG,	dev_priv->front_offset,
				   MGA_DWGCTL + MGA_EXEC,
						dev_priv->clear_cmd );

			ADVANCE_DMA();
		}


		if ( clear->flags & MGA_BACK ) {
			BEGIN_DMA( 2 );

			DMA_BLOCK( MGA_DMAPAD,	0x00000000,
				   MGA_PLNWT,	clear->color_mask,
				   MGA_YDSTLEN, (box->y1 << 16) | height,
				   MGA_FXBNDRY, (box->x2 << 16) | box->x1 );

			DMA_BLOCK( MGA_DMAPAD,	0x00000000,
				   MGA_FCOL,	clear->clear_color,
				   MGA_DSTORG,	dev_priv->back_offset,
				   MGA_DWGCTL + MGA_EXEC,
						dev_priv->clear_cmd );

			ADVANCE_DMA();
		}

		if ( clear->flags & MGA_DEPTH ) {
			BEGIN_DMA( 2 );

			DMA_BLOCK( MGA_DMAPAD,	0x00000000,
				   MGA_PLNWT,	clear->depth_mask,
				   MGA_YDSTLEN, (box->y1 << 16) | height,
				   MGA_FXBNDRY, (box->x2 << 16) | box->x1 );

			DMA_BLOCK( MGA_DMAPAD,	0x00000000,
				   MGA_FCOL,	clear->clear_depth,
				   MGA_DSTORG,	dev_priv->depth_offset,
				   MGA_DWGCTL + MGA_EXEC,
						dev_priv->clear_cmd );

			ADVANCE_DMA();
		}

	}

	BEGIN_DMA( 1 );

	/* Force reset of DWGCTL */
	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_PLNWT,	ctx->plnwt,
		   MGA_DWGCTL,	ctx->dwgctl );

	ADVANCE_DMA();

	FLUSH_DMA();
}

static void mga_dma_dispatch_swap( drm_device_t *dev )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;
	drm_clip_rect_t *pbox = sarea_priv->boxes;
	int nbox = sarea_priv->nbox;
	int i;
	DMA_LOCALS;
	DRM_DEBUG( "\n" );

	sarea_priv->last_frame.head = dev_priv->prim.tail;
	sarea_priv->last_frame.wrap = dev_priv->prim.last_wrap;

	BEGIN_DMA( 4 + nbox );

	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DWGSYNC,	0x00007100,
		   MGA_DWGSYNC,	0x00007000 );

	DMA_BLOCK( MGA_DSTORG,	dev_priv->front_offset,
		   MGA_MACCESS,	dev_priv->maccess,
		   MGA_SRCORG,	dev_priv->back_offset,
		   MGA_AR5,	dev_priv->front_pitch );

	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_PLNWT,	0xffffffff,
		   MGA_DWGCTL,	MGA_DWGCTL_COPY );

	for ( i = 0 ; i < nbox ; i++ ) {
		drm_clip_rect_t *box = &pbox[i];
		u32 height = box->y2 - box->y1;
		u32 start = box->y1 * dev_priv->front_pitch;

		DRM_DEBUG( "   from=%d,%d to=%d,%d\n",
			   box->x1, box->y1, box->x2, box->y2 );

		DMA_BLOCK( MGA_AR0,	start + box->x2 - 1,
			   MGA_AR3,	start + box->x1,
			   MGA_FXBNDRY,	((box->x2 - 1) << 16) | box->x1,
			   MGA_YDSTLEN + MGA_EXEC,
					(box->y1 << 16) | height );
	}

	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_PLNWT,	ctx->plnwt,
		   MGA_SRCORG,	dev_priv->front_offset,
		   MGA_DWGCTL,	ctx->dwgctl );

	ADVANCE_DMA();

	FLUSH_DMA();

	DRM_DEBUG( "%s... done.\n", __FUNCTION__ );
}

static void mga_dma_dispatch_vertex( drm_device_t *dev, drm_buf_t *buf )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_buf_priv_t *buf_priv = buf->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u32 address = (u32) buf->bus_address;
	u32 length = (u32) buf->used;
	int i = 0;
	DMA_LOCALS;
	DRM_DEBUG( "vertex: buf=%d used=%d\n", buf->idx, buf->used );

	if ( buf->used ) {
		buf_priv->dispatched = 1;

		MGA_EMIT_STATE( dev_priv, sarea_priv->dirty );

		do {
			if ( i < sarea_priv->nbox ) {
				mga_emit_clip_rect( dev_priv,
						    &sarea_priv->boxes[i] );
			}

			BEGIN_DMA( 1 );

			DMA_BLOCK( MGA_DMAPAD,		0x00000000,
				   MGA_DMAPAD,		0x00000000,
				   MGA_SECADDRESS,	(address |
							 MGA_DMA_VERTEX),
				   MGA_SECEND,		((address + length) |
							 MGA_PAGPXFER) );

			ADVANCE_DMA();
		} while ( ++i < sarea_priv->nbox );
	}

	if ( buf_priv->discard ) {
		AGE_BUFFER( buf_priv );
		buf->pending = 0;
		buf->used = 0;
		buf_priv->dispatched = 0;

		mga_freelist_put( dev, buf );
	}

	FLUSH_DMA();
}

static void mga_dma_dispatch_indices( drm_device_t *dev, drm_buf_t *buf,
				      unsigned int start, unsigned int end )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_buf_priv_t *buf_priv = buf->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u32 address = (u32) buf->bus_address;
	int i = 0;
	DMA_LOCALS;
	DRM_DEBUG( "indices: buf=%d start=%d end=%d\n", buf->idx, start, end );

	if ( start != end ) {
		buf_priv->dispatched = 1;

		MGA_EMIT_STATE( dev_priv, sarea_priv->dirty );

		do {
			if ( i < sarea_priv->nbox ) {
				mga_emit_clip_rect( dev_priv,
						    &sarea_priv->boxes[i] );
			}

			BEGIN_DMA( 1 );

			DMA_BLOCK( MGA_DMAPAD,		0x00000000,
				   MGA_DMAPAD,		0x00000000,
				   MGA_SETUPADDRESS,	address + start,
				   MGA_SETUPEND,	((address + end) |
							 MGA_PAGPXFER) );

			ADVANCE_DMA();
		} while ( ++i < sarea_priv->nbox );
	}

	if ( buf_priv->discard ) {
		AGE_BUFFER( buf_priv );
		buf->pending = 0;
		buf->used = 0;
		buf_priv->dispatched = 0;

		mga_freelist_put( dev, buf );
	}

	FLUSH_DMA();
}

/* This copies a 64 byte aligned agp region to the frambuffer with a
 * standard blit, the ioctl needs to do checking.
 */
static void mga_dma_dispatch_iload( drm_device_t *dev, drm_buf_t *buf,
				    unsigned int dstorg, unsigned int length )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_buf_priv_t *buf_priv = buf->dev_private;
	drm_mga_context_regs_t *ctx = &dev_priv->sarea_priv->context_state;
	u32 srcorg = buf->bus_address | MGA_SRCACC_AGP | MGA_SRCMAP_SYSMEM;
	u32 y2;
	DMA_LOCALS;
	DRM_DEBUG( "buf=%d used=%d\n", buf->idx, buf->used );

	y2 = length / 64;

	BEGIN_DMA( 5 );

	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DWGSYNC,	0x00007100,
		   MGA_DWGSYNC,	0x00007000 );

	DMA_BLOCK( MGA_DSTORG,	dstorg,
		   MGA_MACCESS,	0x00000000,
		   MGA_SRCORG,	srcorg,
		   MGA_AR5,	64 );

	DMA_BLOCK( MGA_PITCH,	64,
		   MGA_PLNWT,	0xffffffff,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DWGCTL,	MGA_DWGCTL_COPY );

	DMA_BLOCK( MGA_AR0,	63,
		   MGA_AR3,	0,
		   MGA_FXBNDRY,	(63 << 16) | 0,
		   MGA_YDSTLEN + MGA_EXEC, y2 );

	DMA_BLOCK( MGA_PLNWT,	ctx->plnwt,
		   MGA_SRCORG,	dev_priv->front_offset,
		   MGA_PITCH,	dev_priv->front_pitch,
		   MGA_DWGSYNC,	0x00007000 );

	ADVANCE_DMA();

	AGE_BUFFER( buf_priv );

	buf->pending = 0;
	buf->used = 0;
	buf_priv->dispatched = 0;

	mga_freelist_put( dev, buf );

	FLUSH_DMA();
}

static void mga_dma_dispatch_blit( drm_device_t *dev,
				   drm_mga_blit_t *blit )
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_context_regs_t *ctx = &sarea_priv->context_state;
	drm_clip_rect_t *pbox = sarea_priv->boxes;
	int nbox = sarea_priv->nbox;
	u32 scandir = 0, i;
	DMA_LOCALS;
	DRM_DEBUG( "\n" );

	BEGIN_DMA( 4 + nbox );

	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_DMAPAD,	0x00000000,
		   MGA_DWGSYNC,	0x00007100,
		   MGA_DWGSYNC,	0x00007000 );

	DMA_BLOCK( MGA_DWGCTL,	MGA_DWGCTL_COPY,
		   MGA_PLNWT,	blit->planemask,
		   MGA_SRCORG,	blit->srcorg,
		   MGA_DSTORG,	blit->dstorg );

	DMA_BLOCK( MGA_SGN,	scandir,
		   MGA_MACCESS,	dev_priv->maccess,
		   MGA_AR5,	blit->ydir * blit->src_pitch,
		   MGA_PITCH,	blit->dst_pitch );

	for ( i = 0 ; i < nbox ; i++ ) {
		int srcx = pbox[i].x1 + blit->delta_sx;
		int srcy = pbox[i].y1 + blit->delta_sy;
		int dstx = pbox[i].x1 + blit->delta_dx;
		int dsty = pbox[i].y1 + blit->delta_dy;
		int h = pbox[i].y2 - pbox[i].y1;
		int w = pbox[i].x2 - pbox[i].x1 - 1;
		int start;

		if ( blit->ydir == -1 ) {
			srcy = blit->height - srcy - 1;
		}

		start = srcy * blit->src_pitch + srcx;

		DMA_BLOCK( MGA_AR0,	start + w,
			   MGA_AR3,	start,
			   MGA_FXBNDRY,	((dstx + w) << 16) | (dstx & 0xffff),
			   MGA_YDSTLEN + MGA_EXEC, (dsty << 16) | h );
	}

	/* Do something to flush AGP?
	 */

	/* Force reset of DWGCTL */
	DMA_BLOCK( MGA_DMAPAD,	0x00000000,
		   MGA_PLNWT,	ctx->plnwt,
		   MGA_PITCH,	dev_priv->front_pitch,
		   MGA_DWGCTL,	ctx->dwgctl );

	ADVANCE_DMA();
}


/* ================================================================
 *
 */

static int mga_dma_clear( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_clear_t clear;

	LOCK_TEST_WITH_RETURN( dev, filp );

	DRM_COPY_FROM_USER_IOCTL( clear, (drm_mga_clear_t __user *)data, sizeof(clear) );

	if ( sarea_priv->nbox > MGA_NR_SAREA_CLIPRECTS )
		sarea_priv->nbox = MGA_NR_SAREA_CLIPRECTS;

	WRAP_TEST_WITH_RETURN( dev_priv );

	mga_dma_dispatch_clear( dev, &clear );

	/* Make sure we restore the 3D state next time.
	 */
	dev_priv->sarea_priv->dirty |= MGA_UPLOAD_CONTEXT;

	return 0;
}

static int mga_dma_swap( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;

	LOCK_TEST_WITH_RETURN( dev, filp );

	if ( sarea_priv->nbox > MGA_NR_SAREA_CLIPRECTS )
		sarea_priv->nbox = MGA_NR_SAREA_CLIPRECTS;

	WRAP_TEST_WITH_RETURN( dev_priv );

	mga_dma_dispatch_swap( dev );

	/* Make sure we restore the 3D state next time.
	 */
	dev_priv->sarea_priv->dirty |= MGA_UPLOAD_CONTEXT;

	return 0;
}

static int mga_dma_vertex( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_t *buf;
	drm_mga_buf_priv_t *buf_priv;
	drm_mga_vertex_t vertex;

	LOCK_TEST_WITH_RETURN( dev, filp );

	DRM_COPY_FROM_USER_IOCTL( vertex,
			     (drm_mga_vertex_t __user *)data,
			     sizeof(vertex) );

        if(vertex.idx < 0 || vertex.idx > dma->buf_count) return DRM_ERR(EINVAL);
	buf = dma->buflist[vertex.idx];
	buf_priv = buf->dev_private;

	buf->used = vertex.used;
	buf_priv->discard = vertex.discard;

	if ( !mga_verify_state( dev_priv ) ) {
		if ( vertex.discard ) {
			if ( buf_priv->dispatched == 1 )
				AGE_BUFFER( buf_priv );
			buf_priv->dispatched = 0;
			mga_freelist_put( dev, buf );
		}
		return DRM_ERR(EINVAL);
	}

	WRAP_TEST_WITH_RETURN( dev_priv );

	mga_dma_dispatch_vertex( dev, buf );

	return 0;
}

static int mga_dma_indices( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_t *buf;
	drm_mga_buf_priv_t *buf_priv;
	drm_mga_indices_t indices;

	LOCK_TEST_WITH_RETURN( dev, filp );

	DRM_COPY_FROM_USER_IOCTL( indices,
			     (drm_mga_indices_t __user *)data,
			     sizeof(indices) );

        if(indices.idx < 0 || indices.idx > dma->buf_count) return DRM_ERR(EINVAL);

	buf = dma->buflist[indices.idx];
	buf_priv = buf->dev_private;

	buf_priv->discard = indices.discard;

	if ( !mga_verify_state( dev_priv ) ) {
		if ( indices.discard ) {
			if ( buf_priv->dispatched == 1 )
				AGE_BUFFER( buf_priv );
			buf_priv->dispatched = 0;
			mga_freelist_put( dev, buf );
		}
		return DRM_ERR(EINVAL);
	}

	WRAP_TEST_WITH_RETURN( dev_priv );

	mga_dma_dispatch_indices( dev, buf, indices.start, indices.end );

	return 0;
}

static int mga_dma_iload( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_buf_t *buf;
	drm_mga_buf_priv_t *buf_priv;
	drm_mga_iload_t iload;
	DRM_DEBUG( "\n" );

	LOCK_TEST_WITH_RETURN( dev, filp );

	DRM_COPY_FROM_USER_IOCTL( iload, (drm_mga_iload_t __user *)data, sizeof(iload) );

#if 0
	if ( mga_do_wait_for_idle( dev_priv ) < 0 ) {
		if ( MGA_DMA_DEBUG )
			DRM_INFO( "%s: -EBUSY\n", __FUNCTION__ );
		return DRM_ERR(EBUSY);
	}
#endif
        if(iload.idx < 0 || iload.idx > dma->buf_count) return DRM_ERR(EINVAL);

	buf = dma->buflist[iload.idx];
	buf_priv = buf->dev_private;

	if ( mga_verify_iload( dev_priv, iload.dstorg, iload.length ) ) {
		mga_freelist_put( dev, buf );
		return DRM_ERR(EINVAL);
	}

	WRAP_TEST_WITH_RETURN( dev_priv );

	mga_dma_dispatch_iload( dev, buf, iload.dstorg, iload.length );

	/* Make sure we restore the 3D state next time.
	 */
	dev_priv->sarea_priv->dirty |= MGA_UPLOAD_CONTEXT;

	return 0;
}

static int mga_dma_blit( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_blit_t blit;
	DRM_DEBUG( "\n" );

	LOCK_TEST_WITH_RETURN( dev, filp );

	DRM_COPY_FROM_USER_IOCTL( blit, (drm_mga_blit_t __user *)data, sizeof(blit) );

	if ( sarea_priv->nbox > MGA_NR_SAREA_CLIPRECTS )
		sarea_priv->nbox = MGA_NR_SAREA_CLIPRECTS;

	if ( mga_verify_blit( dev_priv, blit.srcorg, blit.dstorg ) )
		return DRM_ERR(EINVAL);

	WRAP_TEST_WITH_RETURN( dev_priv );

	mga_dma_dispatch_blit( dev, &blit );

	/* Make sure we restore the 3D state next time.
	 */
	dev_priv->sarea_priv->dirty |= MGA_UPLOAD_CONTEXT;

	return 0;
}

static int mga_getparam( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_getparam_t param;
	int value;

	if ( !dev_priv ) {
		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL( param, (drm_mga_getparam_t __user *)data,
			     sizeof(param) );

	DRM_DEBUG( "pid=%d\n", DRM_CURRENTPID );

	switch( param.param ) {
	case MGA_PARAM_IRQ_NR:
		value = dev->irq;
		break;
	default:
		return DRM_ERR(EINVAL);
	}

	if ( DRM_COPY_TO_USER( param.value, &value, sizeof(int) ) ) {
		DRM_ERROR( "copy_to_user\n" );
		return DRM_ERR(EFAULT);
	}
	
	return 0;
}

drm_ioctl_desc_t mga_ioctls[] = {
	[DRM_IOCTL_NR(DRM_MGA_INIT)]    = { mga_dma_init,    1, 1 },
	[DRM_IOCTL_NR(DRM_MGA_FLUSH)]   = { mga_dma_flush,   1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_RESET)]   = { mga_dma_reset,   1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_SWAP)]    = { mga_dma_swap,    1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_CLEAR)]   = { mga_dma_clear,   1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_VERTEX)]  = { mga_dma_vertex,  1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_INDICES)] = { mga_dma_indices, 1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_ILOAD)]   = { mga_dma_iload,   1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_BLIT)]    = { mga_dma_blit,    1, 0 },
	[DRM_IOCTL_NR(DRM_MGA_GETPARAM)]= { mga_getparam,    1, 0 },
};

int mga_max_ioctl = DRM_ARRAY_SIZE(mga_ioctls);