/*	$NetBSD: ite_et.c,v 1.12 2007/03/05 20:29:07 he Exp $ */

/*
 * Copyright (c) 1995 Ezra Story
 * Copyright (c) 1995 Kari Mettinen
 * Copyright (c) 1994 Markus Wild
 * Copyright (c) 1994 Lutz Vieweg
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Lutz Vieweg.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#include "opt_amigacons.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ite_et.c,v 1.12 2007/03/05 20:29:07 he Exp $");

#include "grfet.h"
#if NGRFET > 0

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/systm.h>
#include <dev/cons.h>
#include <machine/cpu.h>
#include <amiga/amiga/device.h>
#include <amiga/dev/grfioctl.h>
#include <amiga/dev/grfvar.h>
#include <amiga/dev/grf_etreg.h>
#include <amiga/dev/itevar.h>

#ifdef TSENGCONSOLE
int et_console = 1;
#else
int et_console = 0;
#endif

void et_init(struct ite_softc *ip);
void et_cursor(struct ite_softc *ip, int flag);
void et_deinit(struct ite_softc *ip);
void et_putc(struct ite_softc *ip, int c, int dy, int dx, int mode);
void et_clear(struct ite_softc *ip, int sy, int sx, int h, int w);
void et_scroll(struct ite_softc *ip, int sy, int sx, int count, int dir);
static void etbcopy(const volatile void *src, volatile void *dst, size_t len);


/*
 * Called to determine ite status.  Because the connection between the
 * console & ite in this driver is rather intimate, we return CN_DEAD
 * if the cl_console is not active.
 */
int
grfet_cnprobe(void)
{
	static int done;
	int rv;

	if (et_console && (done == 0))
		rv = CN_INTERNAL;
	else
		rv = CN_DEAD;

	done = 1;
	return(rv);
}


void
grfet_iteinit(struct grf_softc *gp)
{
	gp->g_iteinit = et_init;
	gp->g_itedeinit = et_deinit;
	gp->g_iteclear = et_clear;
	gp->g_iteputc = et_putc;
	gp->g_itescroll = et_scroll;
	gp->g_itecursor = et_cursor;
}


void
et_init(struct ite_softc *ip)
{
	struct grfettext_mode *md;

	ip->priv = ip->grf->g_data;
	md = (struct grfettext_mode *) ip->priv;

	ip->cols = md->cols;
	ip->rows = md->rows;
}


void
et_cursor(struct ite_softc *ip, int flag)
{
	volatile u_char *ba = ip->grf->g_regkva;

	switch (flag) {
 	    case DRAW_CURSOR:
		/*WCrt(ba, CRT_ID_CURSOR_START, & ~0x20); */
	    case MOVE_CURSOR:
		flag = ip->curx + ip->cury * ip->cols;
		WCrt(ba, CRT_ID_CURSOR_LOC_LOW, flag & 0xff);
		WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, (flag >> 8) & 0xff);
		WCrt(ba, CRT_ID_EXT_START, (flag >> (16-2)) & 0x0c);

		ip->cursorx = ip->curx;
		ip->cursory = ip->cury;
		break;
	    case ERASE_CURSOR:
		/*WCrt(ba, CRT_ID_CURSOR_START, | 0x20); */
	    case START_CURSOROPT:
	    case END_CURSOROPT:
	    default:
		break;
    	}
}


void
et_deinit(struct ite_softc *ip)
{
	ip->flags &= ~ITE_INITED;
}


void
et_putc(struct ite_softc *ip, int c, int dy, int dx, int mode)
{
	volatile unsigned char *ba = ip->grf->g_regkva;
	volatile unsigned char *fb = ip->grf->g_fbkva;
	unsigned char attr;
	volatile unsigned char *cp;

	if (ip->flags & ITE_INGRF)
		return;

	attr =(unsigned char) ((mode & ATTR_INV) ? (0x70) : (0x07));
	if (mode & ATTR_UL)     attr  = 0x01;	/* ???????? */
	if (mode & ATTR_BOLD)   attr |= 0x08;
	if (mode & ATTR_BLINK)  attr |= 0x80;

	cp = fb + ((dy * ip->cols) + dx);
	SetTextPlane(ba,0x00);
	*cp = (unsigned char) c;
	SetTextPlane(ba,0x01);
	*cp = (unsigned char) attr;
}


void
et_clear(struct ite_softc *ip, int sy, int sx, int h, int w)
{
	/* cl_clear and cl_scroll both rely on ite passing arguments
	 * which describe continuous regions.  For a VT200 terminal,
	 * this is safe behavior.
	 */
	volatile unsigned char *src, *dst;
	volatile unsigned char *ba = ip->grf->g_regkva;
	int len;

	if (ip->flags & ITE_INGRF)
		return;

	dst = (volatile unsigned char*)ip->grf->g_fbkva + (sy * ip->cols) + sx;
	src = dst + (ip->rows*ip->cols);
	len = w*h;

	SetTextPlane(ba, 0x00);
	etbcopy(src, dst, len);
	SetTextPlane(ba, 0x01);
	etbcopy(src, dst, len);
}


void
et_scroll(struct ite_softc *ip, int sy, int sx, int count, int dir)
{
	volatile unsigned char *fb;
	volatile unsigned char *ba = ip->grf->g_regkva;

	if (ip->flags & ITE_INGRF)
		return;

	fb = (volatile unsigned char*)ip->grf->g_fbkva + sy * ip->cols;
	SetTextPlane(ba, 0x00);

	switch (dir) {
	    case SCROLL_UP:
		etbcopy(fb, fb - (count * ip->cols),
		    (ip->bottom_margin + 1 - sy) * ip->cols);
		break;
	    case SCROLL_DOWN:
		etbcopy(fb, fb + (count * ip->cols),
		    (ip->bottom_margin + 1 - (sy + count)) * ip->cols);
		break;
	    case SCROLL_RIGHT:
		etbcopy(fb+sx, fb+sx+count, ip->cols - (sx + count));
		break;
	    case SCROLL_LEFT:
		etbcopy(fb+sx, fb+sx-count, ip->cols - sx);
		break;
	}

	SetTextPlane(ba, 0x01);

	switch (dir) {
	    case SCROLL_UP:
		etbcopy(fb, fb - (count * ip->cols),
		    (ip->bottom_margin + 1 - sy) * ip->cols);
		break;
	    case SCROLL_DOWN:
		etbcopy(fb, fb + (count * ip->cols),
		    (ip->bottom_margin + 1 - (sy + count)) * ip->cols);
		break;
	    case SCROLL_RIGHT:
		etbcopy(fb+sx, fb+sx+count, ip->cols - (sx + count));
		break;
	    case SCROLL_LEFT:
		etbcopy(fb+sx, fb+sx-count, ip->cols - sx);
		break;
	}
}


static void etbcopy(const volatile void *src, volatile void *dst, size_t len)
{
	int i;
	volatile char *cdst;
	volatile const char *csrc;

	cdst = (volatile char*)dst;
	csrc = (volatile const char*)src;

	if (csrc == cdst)
		return;

	if (csrc > cdst)
		for (i=len; i>0; i--) {
			*cdst++ = *csrc++;
		}
	else {
		csrc += len;
		cdst += len;

		for (i=len; i>0; i--){
			*--cdst = *--csrc;
		}
	}
}

#endif /* NGRFET */