/* $NetBSD: pcdisplay_subr.c,v 1.35 2010/10/19 22:27:19 jmcneill Exp $ */

/*
 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pcdisplay_subr.c,v 1.35 2010/10/19 22:27:19 jmcneill Exp $");

#include "opt_wsmsgattrs.h" /* for WSDISPLAY_CUSTOM_OUTPUT */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/bus.h>

#include <dev/ic/mc6845reg.h>
#include <dev/ic/pcdisplayvar.h>
#include <dev/wscons/wsconsio.h>

#include <dev/wscons/wsdisplayvar.h>

void
pcdisplay_cursor_init(struct pcdisplayscreen *scr, int existing)
{
#ifdef PCDISPLAY_SOFTCURSOR
	bus_space_tag_t memt;
	bus_space_handle_t memh;
	int off;

	/* Disable the hardware cursor */
	pcdisplay_6845_write(scr->hdl, curstart, 0x20);
	pcdisplay_6845_write(scr->hdl, curend, 0x00);

	if (existing) {
		/*
		 * This is the first screen. At this point, scr->mem is NULL
		 * (no backing store), so we can't use pcdisplay_cursor() to
		 * do this.
		 */
		memt = scr->hdl->ph_memt;
		memh = scr->hdl->ph_memh;
		off = (scr->cursorrow * scr->type->ncols + scr->cursorcol) * 2
		    + scr->dispoffset;

		scr->cursortmp = bus_space_read_2(memt, memh, off);
		bus_space_write_2(memt, memh, off, scr->cursortmp ^ 0x7700);
	} else
		scr->cursortmp = 0;
#else
	/*
	 * Firmware might not have initialized the cursor shape.  Make
	 * sure there's something we can see.
	 * Don't touch the hardware if this is not the first screen.
	 */
	if (existing) {
		pcdisplay_6845_write(scr->hdl, curstart,
				     scr->type->fontheight - 2);
		pcdisplay_6845_write(scr->hdl, curend,
				     scr->type->fontheight - 1);
	}
#endif
	scr->cursoron = 1;
}

void
pcdisplay_cursor(void *id, int on, int row, int col)
{
#ifdef PCDISPLAY_SOFTCURSOR
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	int off;

	/* Remove old cursor image */
	if (scr->cursoron) {
		off = scr->cursorrow * scr->type->ncols + scr->cursorcol;
		if (scr->active)
			bus_space_write_2(memt, memh, scr->dispoffset + off * 2,
			    scr->cursortmp);
		else
			scr->mem[off] = scr->cursortmp;
	}

	scr->cursorrow = row;
	scr->cursorcol = col;

	if ((scr->cursoron = on) == 0)
		return;

	off = (scr->cursorrow * scr->type->ncols + scr->cursorcol);
	if (scr->active) {
		off = off * 2 + scr->dispoffset;
		scr->cursortmp = bus_space_read_2(memt, memh, off);
		bus_space_write_2(memt, memh, off, scr->cursortmp ^ 0x7700);
	} else {
		scr->cursortmp = scr->mem[off];
		scr->mem[off] = scr->cursortmp ^ 0x7700;
	}
#else 	/* PCDISPLAY_SOFTCURSOR */
	struct pcdisplayscreen *scr = id;
	int pos;

	scr->cursorrow = row;
	scr->cursorcol = col;
	scr->cursoron = on;

	if (scr->active) {
		if (!on)
			pos = 0x3fff;
		else
			pos = scr->dispoffset / 2
				+ row * scr->type->ncols + col;

		pcdisplay_6845_write(scr->hdl, cursorh, pos >> 8);
		pcdisplay_6845_write(scr->hdl, cursorl, pos);
	}
#endif	/* PCDISPLAY_SOFTCURSOR */
}

#if 0
unsigned int
pcdisplay_mapchar_simple(void *id, int uni)
{
	if (uni < 128)
		return (uni);

	return (1); /* XXX ??? smiley */
}
#endif

void
pcdisplay_putchar(void *id, int row, int col, unsigned int c, long attr)
{
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	size_t off;

	off = row * scr->type->ncols + col;

	/* check for bogus row and column sizes */
	if (__predict_false(off >= (scr->type->ncols * scr->type->nrows)))
		return;

	if (scr->active)
		bus_space_write_2(memt, memh, scr->dispoffset + off * 2,
				  c | (attr << 8));
	else
		scr->mem[off] = c | (attr << 8);

	scr->visibleoffset = scr->dispoffset;
}

void
pcdisplay_copycols(void *id, int row, int srccol, int dstcol, int ncols)
{
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	bus_size_t srcoff, dstoff;

	srcoff = dstoff = row * scr->type->ncols;
	srcoff += srccol;
	dstoff += dstcol;

	if (scr->active)
		bus_space_copy_region_2(memt, memh,
					scr->dispoffset + srcoff * 2,
					memh, scr->dispoffset + dstoff * 2,
					ncols);
	else
		memcpy(&scr->mem[dstoff], &scr->mem[srcoff], ncols * 2);
}

void
pcdisplay_erasecols(void *id, int row, int startcol, int ncols, long fillattr)
{
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	bus_size_t off;
	u_int16_t val;
	int i;

	off = row * scr->type->ncols + startcol;

	val = (fillattr << 8) | ' ';

	if (scr->active)
		bus_space_set_region_2(memt, memh, scr->dispoffset + off * 2,
				       val, ncols);
	else
		for (i = 0; i < ncols; i++)
			scr->mem[off + i] = val;
}

void
pcdisplay_copyrows(void *id, int srcrow, int dstrow, int nrows)
{
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	int ncols = scr->type->ncols;
	bus_size_t srcoff, dstoff;

	srcoff = srcrow * ncols + 0;
	dstoff = dstrow * ncols + 0;

	if (scr->active)
		bus_space_copy_region_2(memt, memh,
					scr->dispoffset + srcoff * 2,
					memh, scr->dispoffset + dstoff * 2,
					nrows * ncols);
	else
		memcpy(&scr->mem[dstoff], &scr->mem[srcoff],
		      nrows * ncols * 2);
}

void
pcdisplay_eraserows(void *id, int startrow, int nrows, long fillattr)
{
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	bus_size_t off, count;
	u_int16_t val;
	u_int i;

	off = startrow * scr->type->ncols;
	count = nrows * scr->type->ncols;

	val = (fillattr << 8) | ' ';

	if (scr->active)
		bus_space_set_region_2(memt, memh, scr->dispoffset + off * 2,
				       val, count);
	else
		for (i = 0; i < count; i++)
			scr->mem[off + i] = val;
}

#ifdef WSDISPLAY_CUSTOM_OUTPUT
void
pcdisplay_replaceattr(void *id, long oldattr, long newattr)
{
	struct pcdisplayscreen *scr = id;
	bus_space_tag_t memt = scr->hdl->ph_memt;
	bus_space_handle_t memh = scr->hdl->ph_memh;
	int off;
	uint16_t chardata;

	if (scr->active)
		for (off = 0; off < scr->type->nrows * scr->type->ncols;
		     off++) {
			chardata = bus_space_read_2(memt, memh,
						    scr->dispoffset + off * 2);
			if ((long)(chardata >> 8) == oldattr)
				bus_space_write_2(memt, memh,
				                  scr->dispoffset + off * 2,
				               	  ((u_int16_t)(newattr << 8)) |
				                  (chardata & 0x00FF));
		}
	else
		for (off = 0; off < scr->type->nrows * scr->type->ncols;
		     off++) {
			chardata = scr->mem[off];
			if ((long)(chardata >> 8) == oldattr)
				scr->mem[off] = ((u_int16_t)(newattr << 8)) |
				                (chardata & 0x00FF);
		}
}
#endif /* WSDISPLAY_CUSTOM_OUTPUT */

int
pcdisplay_getwschar(struct pcdisplayscreen *scr, struct wsdisplay_char *wschar)
{
	size_t off;
	uint16_t chardata;
	uint8_t attrbyte;

	KASSERT(scr != NULL && wschar != NULL);

	off = wschar->row * scr->type->ncols + wschar->col;
	if (off >= scr->type->ncols * scr->type->nrows)
		return -1;

	if (scr->active)
		chardata = bus_space_read_2(scr->hdl->ph_memt,
		    scr->hdl->ph_memh, scr->dispoffset + off * 2);
	else
		chardata = scr->mem[off];

	wschar->letter = (chardata & 0x00FF);
	wschar->flags = 0;
	attrbyte = (chardata & 0xFF00) >> 8;
	if ((attrbyte & 0x08)) wschar->flags |= WSDISPLAY_CHAR_BRIGHT;
	if ((attrbyte & 0x80)) wschar->flags |= WSDISPLAY_CHAR_BLINK;
	wschar->foreground = attrbyte & 0x07;
	wschar->background = (attrbyte >> 4) & 0x07;

	return 0;
}

int
pcdisplay_putwschar(struct pcdisplayscreen *scr, struct wsdisplay_char *wschar)
{
	size_t off;
	uint16_t chardata;
	uint8_t attrbyte;

	KASSERT(scr != NULL && wschar != NULL);

	off = wschar->row * scr->type->ncols + wschar->col;
	if (off >= (scr->type->ncols * scr->type->nrows))
		return -1;

	attrbyte = wschar->background & 0x07;
	if (wschar->flags & WSDISPLAY_CHAR_BLINK) attrbyte |= 0x08;
	attrbyte <<= 4;
	attrbyte |= wschar->foreground & 0x07;
	if (wschar->flags & WSDISPLAY_CHAR_BRIGHT) attrbyte |= 0x08;
	chardata = (attrbyte << 8) | wschar->letter;

	if (scr->active)
		bus_space_write_2(scr->hdl->ph_memt, scr->hdl->ph_memh,
		    scr->dispoffset + off * 2, chardata);
	else
		scr->mem[off] = chardata;

	return 0;
}