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/* $OpenBSD: vga_subr.c,v 1.4 2010/08/28 12:48:14 miod Exp $ */
/* $NetBSD: vga_subr.c,v 1.6 2000/01/25 02:44:03 ad Exp $ */
/*
* Copyright (c) 1998
* Matthias Drochner. 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.
*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/queue.h>
#include <machine/bus.h>
#include <dev/ic/mc6845reg.h>
#include <dev/ic/pcdisplayvar.h>
#include <dev/ic/vgareg.h>
#include <dev/ic/vgavar.h>
#include <dev/wscons/wsdisplayvar.h>
static void fontram(struct vga_handle *);
static void textram(struct vga_handle *);
static void
fontram(struct vga_handle *vh)
{
/* program sequencer to access character generator */
vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */
vga_ts_write(vh, wrplmask, 0x04); /* write to map 2 */
vga_ts_write(vh, memmode, 0x07); /* sequential addressing */
vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */
/* program graphics controller to access character generator */
vga_gdc_write(vh, rdplanesel, 0x02); /* select map 2 for cpu reads */
vga_gdc_write(vh, mode, 0x00); /* disable odd-even addressing */
vga_gdc_write(vh, misc, 0x04); /* map starts at 0xA000 */
}
static void
textram(struct vga_handle *vh)
{
/* program sequencer to access video ram */
vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */
vga_ts_write(vh, wrplmask, 0x03); /* write to map 0 & 1 */
vga_ts_write(vh, memmode, 0x03); /* odd-even addressing */
vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */
/* program graphics controller for text mode */
vga_gdc_write(vh, rdplanesel, 0x00); /* select map 0 for cpu reads */
vga_gdc_write(vh, mode, 0x10); /* enable odd-even addressing */
/* map starts at 0xb800 or 0xb000 (mono) */
vga_gdc_write(vh, misc, (vh->vh_mono ? 0x0a : 0x0e));
}
void
vga_loadchars(struct vga_handle *vh, int fontset, int first, int num, int lpc,
char *data)
{
int offset, i, j, s;
/* fontset number swizzle done in vga_setfontset() */
offset = (fontset << 13) | (first << 5);
s = splhigh();
fontram(vh);
for (i = 0; i < num; i++)
for (j = 0; j < lpc; j++)
bus_space_write_1(vh->vh_memt, vh->vh_allmemh,
offset + (i << 5) + j,
data[i * lpc + j]);
textram(vh);
splx(s);
}
void
vga_setfontset(struct vga_handle *vh, int fontset1, int fontset2)
{
u_int8_t cmap;
static const u_int8_t cmaptaba[] = {
0x00, 0x10, 0x01, 0x11,
0x02, 0x12, 0x03, 0x13
};
static const u_int8_t cmaptabb[] = {
0x00, 0x20, 0x04, 0x24,
0x08, 0x28, 0x0c, 0x2c
};
/* extended font if fontset1 != fontset2 */
cmap = cmaptaba[fontset1] | cmaptabb[fontset2];
vga_ts_write(vh, fontsel, cmap);
}
void
vga_setscreentype(struct vga_handle *vh, const struct wsscreen_descr *type)
{
vga_6845_write(vh, maxrow, type->fontheight - 1);
/* lo byte */
vga_6845_write(vh, vde, type->fontheight * type->nrows - 1);
#ifndef PCDISPLAY_SOFTCURSOR
/* set cursor to last 2 lines */
vga_6845_write(vh, curstart, type->fontheight - 2);
vga_6845_write(vh, curend, type->fontheight - 1);
#endif
/*
* disable colour plane 3 if needed for font selection
*/
if (type->capabilities & WSSCREEN_HILIT) {
/*
* these are the screens which don't support
* 512-character fonts
*/
vga_attr_write(vh, colplen, 0x0f);
} else
vga_attr_write(vh, colplen, 0x07);
}
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