shared/mga_state.c


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/* 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 "mga.h"
#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;