/*	$NetBSD: ite_rh.c,v 1.14 2017/12/20 05:27:06 msaitoh Exp $ */

/*
 * 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_retina.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ite_rh.c,v 1.14 2017/12/20 05:27:06 msaitoh Exp $");

#include "grfrh.h"
#if NGRFRH > 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_rhreg.h>
#include <amiga/dev/itevar.h>

#ifdef	RETINA_SPEED_HACK
static void screen_up(struct ite_softc *, int, int, int);
static void screen_down(struct ite_softc *, int, int, int);
#endif

/*
 * grfrh_cnprobe is called when the console is being initialized
 * i.e. very early.  grfconfig() has been called, so this implies
 * that rh_init() was called.  If we are functioning rh_inited
 * will be true.
 */
int
grfrh_cnprobe(void)
{
	static int done;
	int rv;

	if (done == 0)
		rv = CN_INTERNAL;
	else
		rv = CN_NORMAL;
	done = 1;
	return(rv);
}


void
grfrh_iteinit(struct grf_softc *gp)
{
	gp->g_iteinit = rh_init;
	gp->g_itedeinit = rh_deinit;
	gp->g_iteclear = rh_clear;
	gp->g_iteputc = rh_putc;
	gp->g_itescroll = rh_scroll;
	gp->g_itecursor = rh_cursor;
}


void
rh_init(struct ite_softc *ip)
{
	struct MonDef *md;

#if 0 /* Not in ite_rt.c - DC */
	if (ip->grf == 0)
		ip->grf = &grf_softc[ip - ite_softc];
#endif

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

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


void
rh_cursor(struct ite_softc *ip, int flag)
{
#if 0
	volatile u_char *ba = ip->grf->g_regkva;
#endif

	if (flag == START_CURSOROPT || flag == END_CURSOROPT)
		return;

	if (flag == ERASE_CURSOR) {
#if 0
		/* disable cursor */
		WCrt (ba, CRT_ID_CURSOR_START,
		    RCrt (ba, CRT_ID_CURSOR_START) | 0x20);
#endif
	} else {
		int pos = ip->curx + ip->cury * ip->cols;
#if 0
		/* make sure to enable cursor */
		WCrt (ba, CRT_ID_CURSOR_START,
		    RCrt (ba, CRT_ID_CURSOR_START) & ~0x20);
#endif

		/* and position it */
		RZ3SetCursorPos (ip->grf, pos);

		ip->cursorx = ip->curx;
		ip->cursory = ip->cury;
	}
}


#ifdef	RETINA_SPEED_HACK
static void
screen_up(struct ite_softc *ip, int top, int bottom, int lines)
{

	/* do some bounds-checking here.. */
	if (top >= bottom)
		return;

	if (top + lines >= bottom) {
		RZ3AlphaErase(ip->grf, 0, top, bottom - top, ip->cols);
		return;
	}

	RZ3AlphaCopy(ip->grf, 0, top+lines, 0, top, ip->cols, bottom-top-lines+1);
	RZ3AlphaErase(ip->grf, 0, bottom - lines + 1, ip->cols, lines);
}


static void
screen_down (struct ite_softc *ip, int top, int bottom, int lines)
{

	/* do some bounds-checking here.. */
	if (top >= bottom)
		return;

	if (top + lines >= bottom) {
		RZ3AlphaErase(ip->grf, 0, top, bottom - top, ip->cols);
		return;
	}

	RZ3AlphaCopy(ip->grf, 0, top, 0, top+lines, ip->cols, bottom-top-lines+1);
	RZ3AlphaErase(ip->grf, 0, top, ip->cols, lines);
}
#endif	/* RETINA_SPEED_HACK */


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


void
rh_putc(struct ite_softc *ip, int c, int dy, int dx, int mode)
{
	volatile u_char * fb = ip->grf->g_fbkva;
	register u_char attr;

	attr = (mode & ATTR_INV) ? 0x21 : 0x10;
	if (mode & ATTR_UL)     attr  = 0x01;	/* ???????? */
	if (mode & ATTR_BOLD)   attr |= 0x08;
	if (mode & ATTR_BLINK)  attr |= 0x80;

	fb += 4 * (dy * ip->cols + dx);
	*fb++ = c; *fb = attr;
}


void
rh_clear(struct ite_softc *ip, int sy, int sx, int h, int w)
{
	RZ3AlphaErase (ip->grf, sx, sy, w, h);
}


/*
 * RETINA_SPEED_HACK code seems to work on some boards and on others
 * it causes text to smear horizontally
 */
void
rh_scroll(struct ite_softc *ip, int sy, int sx, int count, int dir)
{
#ifndef	RETINA_SPEED_HACK
	u_long *fb = (u_long *)__UNVOLATILE(ip->grf->g_fbkva);
#endif

	rh_cursor(ip, ERASE_CURSOR);

	if (dir == SCROLL_UP) {
#ifdef	RETINA_SPEED_HACK
		screen_up(ip, sy - count, ip->bottom_margin, count);
#else
		memcpy(fb + (sy - count) * ip->cols, fb + sy * ip->cols,
		    4 * (ip->bottom_margin - sy + 1) * ip->cols);
		rh_clear(ip, ip->bottom_margin + 1 - count, 0, count, ip->cols);
#endif
	} else if (dir == SCROLL_DOWN) {
#ifdef	RETINA_SPEED_HACK
		screen_down(ip, sy, ip->bottom_margin, count);
#else
		memcpy(fb + (sy + count) * ip->cols, fb + sy * ip->cols,
		    4 * (ip->bottom_margin - sy - count + 1) * ip->cols);
		rh_clear(ip, sy, 0, count, ip->cols);
#endif
	} else if (dir == SCROLL_RIGHT) {
		RZ3AlphaCopy(ip->grf, sx, sy, sx + count, sy,
		    ip->cols - (sx + count), 1);
		RZ3AlphaErase(ip->grf, sx, sy, count, 1);
	} else {
		RZ3AlphaCopy(ip->grf, sx + count, sy, sx, sy,
		    ip->cols - (sx + count), 1);
		RZ3AlphaErase(ip->grf, ip->cols - count, sy, count, 1);
	}
#ifndef	RETINA_SPEED_HACK
	rh_cursor(ip, !ERASE_CURSOR);
#endif
}
#endif /* NGRFRH */