path: root/drivers/gpu/drm/radeon/r300_cmdbuf.c

/* r300_cmdbuf.c -- Command buffer emission for R300 -*- linux-c -*-
 *
 * Copyright (C) The Weather Channel, Inc.  2002.
 * Copyright (C) 2004 Nicolai Haehnle.
 * All Rights Reserved.
 *
 * The Weather Channel (TM) funded Tungsten Graphics to develop the
 * initial release of the Radeon 8500 driver under the XFree86 license.
 * This notice must be preserved.
 *
 * 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
 * PRECISION INSIGHT 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:
 *    Nicolai Haehnle <prefect_@gmx.net>
 */

#include "drmP.h"
#include "drm.h"
#include "radeon_drm.h"
#include "radeon_drv.h"
#include "r300_reg.h"

#include <asm/unaligned.h>

#define R300_SIMULTANEOUS_CLIPRECTS		4

/* Values for R300_RE_CLIPRECT_CNTL depending on the number of cliprects
 */
static const int r300_cliprect_cntl[4] = {
	0xAAAA,
	0xEEEE,
	0xFEFE,
	0xFFFE
};

/**
 * Emit up to R300_SIMULTANEOUS_CLIPRECTS cliprects from the given command
 * buffer, starting with index n.
 */
static int r300_emit_cliprects(drm_radeon_private_t *dev_priv,
			       drm_radeon_kcmd_buffer_t *cmdbuf, int n)
{
	struct drm_clip_rect box;
	int nr;
	int i;
	RING_LOCALS;

	nr = cmdbuf->nbox - n;
	if (nr > R300_SIMULTANEOUS_CLIPRECTS)
		nr = R300_SIMULTANEOUS_CLIPRECTS;

	DRM_DEBUG("%i cliprects\n", nr);

	if (nr) {
		BEGIN_RING(6 + nr * 2);
		OUT_RING(CP_PACKET0(R300_RE_CLIPRECT_TL_0, nr * 2 - 1));

		for (i = 0; i < nr; ++i) {
			if (DRM_COPY_FROM_USER_UNCHECKED
			    (&box, &cmdbuf->boxes[n + i], sizeof(box))) {
				DRM_ERROR("copy cliprect faulted\n");
				return -EFAULT;
			}

			box.x2--; /* Hardware expects inclusive bottom-right corner */
			box.y2--;

			if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RV515) {
				box.x1 = (box.x1) &
					R300_CLIPRECT_MASK;
				box.y1 = (box.y1) &
					R300_CLIPRECT_MASK;
				box.x2 = (box.x2) &
					R300_CLIPRECT_MASK;
				box.y2 = (box.y2) &
					R300_CLIPRECT_MASK;
			} else {
				box.x1 = (box.x1 + R300_CLIPRECT_OFFSET) &
					R300_CLIPRECT_MASK;
				box.y1 = (box.y1 + R300_CLIPRECT_OFFSET) &
					R300_CLIPRECT_MASK;
				box.x2 = (box.x2 + R300_CLIPRECT_OFFSET) &
					R300_CLIPRECT_MASK;
				box.y2 = (box.y2 + R300_CLIPRECT_OFFSET) &
					R300_CLIPRECT_MASK;
			}

			OUT_RING((box.x1 << R300_CLIPRECT_X_SHIFT) |
				 (box.y1 << R300_CLIPRECT_Y_SHIFT));
			OUT_RING((box.x2 << R300_CLIPRECT_X_SHIFT)