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Initial revision

/*	$OpenBSD: bt_subr.c,v 1.9 2003/06/02 23:27:53 millert Exp $	*/
/*	$NetBSD: bt_subr.c,v 1.5 1996/03/14 19:44:32 christos Exp $ */

/*
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)bt_subr.c	8.2 (Berkeley) 1/21/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/errno.h>

#include <uvm/uvm_extern.h>

#include <dev/wscons/wsconsio.h>

#include <sparc/dev/btreg.h>
#include <sparc/dev/btvar.h>

/*
 * Common code for dealing with Brooktree video DACs.
 */

int
bt_getcmap(bcm, rcm)
	union bt_cmap *bcm;
	struct wsdisplay_cmap *rcm;
{
	u_int index = rcm->index, count = rcm->count, i;
	int error;

	if (index >= 256 || count > 256 - index)
		return (EINVAL);
	for (i = 0; i < count; i++) {
		if ((error = copyout(&bcm->cm_map[index + i][0],
		    &rcm->red[i], 1)) != 0)
			return (error);
		if ((error = copyout(&bcm->cm_map[index + i][1],
		    &rcm->green[i], 1)) != 0)
			return (error);
		if ((error = copyout(&bcm->cm_map[index + i][2],
		    &rcm->blue[i], 1)) != 0)
			return (error);
	}
	return (0);
}

int
bt_putcmap(bcm, rcm)
	union bt_cmap *bcm;
	struct wsdisplay_cmap *rcm;
{
	u_int index = rcm->index, count = rcm->count, i;
	int error;

	if (index >= 256 || count > 256 - index)
		return (EINVAL);
	for (i = 0; i < count; i++) {
		if ((error = copyin(&rcm->red[i],
		    &bcm->cm_map[index + i][0], 1)) != 0)
			return (error);
		if ((error = copyin(&rcm->green[i],
		    &bcm->cm_map[index + i][1], 1)) != 0)
			return (error);
		if ((error = copyin(&rcm->blue[i],
		    &bcm->cm_map[index + i][2], 1)) != 0)
			return (error);
	}
	return (0);
}

void
bt_loadcmap(cm, bt, start, ncolors, cgsix)
	union bt_cmap *cm;
	volatile struct bt_regs *bt;
	u_int start, ncolors;
	int cgsix;
{
	u_int *ip, i;
	int count;

	ip = &cm->cm_chip[BT_D4M3(start)];	/* start/4 * 3 */
	count = BT_D4M3(start + ncolors - 1) - BT_D4M3(start) + 3;

	if (cgsix) {
		/* hardware that makes one want to pound boards with hammers */
		bt->bt_addr = BT_D4M4(start) << 24;
		while (--count >= 0) {
			i = *ip++;
			bt->bt_cmap = i;
			bt->bt_cmap = i << 8;
			bt->bt_cmap = i << 16;
			bt->bt_cmap = i << 24;
		}
	} else {
		bt->bt_addr = BT_D4M4(start);
		while (--count >= 0)
			bt->bt_cmap = *ip++;
	}
}

void
bt_setcolor(cm, bt, index, r, g, b, cgsix)
	union bt_cmap *cm;
	volatile struct bt_regs *bt;
	u_int index;
	u_int8_t r, g, b;
	int cgsix;
{

	cm->cm_map[index][0] = r;
	cm->cm_map[index][1] = g;
	cm->cm_map[index][2] = b;
	bt_loadcmap(cm, bt, index, 1, cgsix);
}