/*
 * Command queue submission via DRM
 *
 * Copyright 2009 Thomas White <taw@bitwiz.org.uk>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */


#include <stdint.h>
#include <drm.h>
#include <glamo_drm.h>
#include <glamo_bo.h>

#include "glamo_context.h"
#include "glamo_cmdq.h"


/* Submit the prepared command sequence to the kernel */
void glamoDRMDispatch(glamoContext *gCtx)
{
	drm_glamo_cmd_buffer_t cmdbuf;
	int r;

	cmdbuf.buf = (char *)gCtx->cmdq_drm;
	cmdbuf.bufsz = gCtx->cmdq_drm_used * 2;	/* -> bytes */
	cmdbuf.nobjs = gCtx->cmdq_obj_used;
	cmdbuf.objs = gCtx->cmdq_objs;
	cmdbuf.obj_pos = gCtx->cmdq_obj_pos;

	r = drmCommandWrite(gCtx->drm_fd, DRM_GLAMO_CMDBUF,
	                    &cmdbuf, sizeof(cmdbuf));
	if ( r != 0 ) {
		fprintf(stderr, "DRM_GLAMO_CMDBUF failed\n");
	}

	/* Reset counts to zero for the next sequence */
	gCtx->cmdq_obj_used = 0;
	gCtx->cmdq_drm_used = 0;
}


void glamoDRMAddCommand(glamoContext *gCtx, uint16_t reg,
                        uint16_t val)
{
	if ( gCtx->cmdq_drm_used == gCtx->cmdq_drm_size ) {
		glamoDRMDispatch(gCtx);
	}

	/* Record command */
	gCtx->cmdq_drm[gCtx->cmdq_drm_used++] = reg;
	gCtx->cmdq_drm[gCtx->cmdq_drm_used++] = val;
}


void glamoDRMAddCommandBO(glamoContext *gCtx, uint16_t reg,
                          struct glamo_bo *bo)
{
	if ( gCtx->cmdq_drm_used == gCtx->cmdq_drm_size ) {
		glamoDRMDispatch(gCtx);
	}

	/* Record object position */
	gCtx->cmdq_objs[gCtx->cmdq_obj_used] = bo->handle;
	/* -> bytes */
	gCtx->cmdq_obj_pos[gCtx->cmdq_obj_used] = gCtx->cmdq_drm_used * 2;
	gCtx->cmdq_obj_used++;

	/* Record command */
	gCtx->cmdq_drm[gCtx->cmdq_drm_used++] = reg;
	gCtx->cmdq_drm[gCtx->cmdq_drm_used++] = 0x0000;
	gCtx->cmdq_drm[gCtx->cmdq_drm_used++] = reg+2;
	gCtx->cmdq_drm[gCtx->cmdq_drm_used++] = 0x0000;
}


void glamoInitCmdqCache(glamoContext *gCtx)
{
	gCtx->cmdq_objs = malloc(1024);
	gCtx->cmdq_obj_pos = malloc(1024);
	gCtx->cmdq_obj_used = 0;
	gCtx->cmdq_drm_used = 0;
	gCtx->cmdq_drm_size = 4 * 1024;
	gCtx->cmdq_drm = malloc(gCtx->cmdq_drm_size);
}