* Copyright (c) 1998

/* $NetBSD: vga_subr.c,v 1.26 2023/05/06 21:34:40 andvar 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vga_subr.c,v 1.26 2023/05/06 21:34:40 andvar Exp $");

/* for WSDISPLAY_BORDER_COLOR */
#include "opt_wsdisplay_border.h"

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

#include <dev/ic/mc6845reg.h>
#include <dev/ic/pcdisplay.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));
}

#ifndef VGA_RASTERCONSOLE
void
vga_loadchars(struct vga_handle *vh, int fontset, int first, int num, int lpc,
const 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_readoutchars(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++)
data[i * lpc + j] = bus_space_read_1(vh->vh_memt,
vh->vh_allmemh, offset + (i << 5) + j);

textram(vh);
splx(s);
}

#ifdef VGA_CONSOLE_ATI_BROKEN_FONTSEL
void
vga_copyfont01(struct vga_handle *vh)
{
int s;

s = splhigh();
fontram(vh);

bus_space_copy_region_1(vh->vh_memt, vh->vh_allmemh, 0,
vh->vh_allmemh, 1 << 13, 1 << 13);

textram(vh);
splx(s);
}
#endif

void
vga_setfontset(struct vga_handle *vh, int fontset1, int fontset2)
{
uint8_t cmap;
static const uint8_t cmaptaba[] = {
0x00, 0x10, 0x01, 0x11,
0x02, 0x12, 0x03, 0x13
};
static const uint8_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);
}

#else /* !VGA_RASTERCONSOLE */
void
vga_load_builtinfont(struct vga_handle *vh, uint8_t *font, int firstchar,
int numchars)
{
int i, s;

s = splhigh();
fontram(vh);

for (i = firstchar; i < firstchar + numchars; i++)
bus_space_read_region_1(vh->vh_memt, vh->vh_allmemh, i * 32,
font + i * 16, 16);

textram(vh);
splx(s);
}
#endif /* !VGA_RASTERCONSOLE */

/*
* vga_reset():
* Reset VGA registers to put it into 80x25 text mode. (mode 3)
* This function should be called from MD consinit() on ports
* whose firmware does not use text mode at boot time.
*/
void
vga_reset(struct vga_handle *vh, void (*md_initfunc)(struct vga_handle *))
{
uint8_t reg;

if (bus_space_map(vh->vh_iot, 0x3c0, 0x10, 0, &vh->vh_ioh_vga))
return;

reg = vga_raw_read(vh, VGA_MISC_DATAR);
vh->vh_mono = !(reg & 0x01);

if (bus_space_map(vh->vh_iot, vh->vh_mono ? 0x3b0 : 0x3d0, 0x10,
0, &vh->vh_ioh_6845))
goto out1;

if (bus_space_map(vh->vh_memt, 0xa0000, 0x20000, 0, &vh->vh_allmemh))
goto out2;

if (bus_space_subregion(vh->vh_memt, vh->vh_allmemh,
vh->vh_mono ? 0x10000 : 0x18000, 0x8000, &vh->vh_memh))
goto out3;

/* check if VGA already in text mode. */
if ((vga_gdc_read(vh, misc) & 0x01) == 0)
goto out3;

/* initialize common VGA registers */
vga_initregs(vh);

/* initialize chipset specific registers */
if (md_initfunc != NULL)
(*md_initfunc)(vh);

delay(10000);

/* clear text buffer RAM */
bus_space_set_region_2(vh->vh_memt, vh->vh_memh, 0,
((BG_BLACK | FG_LIGHTGREY) << 8) | ' ', 80 * 25 /*XXX*/);

out3:
bus_space_unmap(vh->vh_memt, vh->vh_allmemh, 0x20000);
out2:
bus_space_unmap(vh->vh_iot, vh->vh_ioh_6845, 0x10);
out1:
bus_space_unmap(vh->vh_iot, vh->vh_ioh_vga, 0x10);
}

/*
* values to initialize registers.
*/

/* miscellaneous output register */
#define VGA_MISCOUT 0x66

/* sequencer registers */
static const uint8_t vga_ts[] = {
0x03, /* 00: reset */
0x00, /* 01: clocking mode */
0x03, /* 02: map mask */
0x00, /* 03: character map select */
0x02 /* 04: memory mode */
};

/* CRT controller registers */
static const uint8_t vga_crtc[] = {
0x5f, /* 00: horizontal total */
0x4f, /* 01: horizontal display-enable end */
0x50, /* 02: start horizontal blanking */
0x82, /* 03: display skew control / end horizontal blanking */
0x55, /* 04: start horizontal retrace pulse */
0x81, /* 05: horizontal retrace delay / end horizontal retrace */
0xbf, /* 06: vertical total */
0x1f, /* 07: overflow register */
0x00, /* 08: preset row scan */
0x4f, /* 09: overflow / maximum scan line */
0x0d, /* 0A: cursor off / cursor start */
0x0e, /* 0B: cursor skew / cursor end */
0x00, /* 0C: start regenerative buffer address high */
0x00, /* 0D: start regenerative buffer address low */
0x00, /* 0E: cursor location high */
0x00, /* 0F: cursor location low */
0x9c, /* 10: vertical retrace start */
0x8e, /* 11: vertical interrupt / vertical retrace end */
0x8f, /* 12: vertical display enable end */
0x28, /* 13: logical line width */
0x00, /* 14: underline location */
0x96, /* 15: start vertical blanking */
0xb9, /* 16: end vertical blanking */
0xa3, /* 17: CRT mode control */
0xff /* 18: line compare */
};

/* graphics controller registers */
static const uint8_t vga_gdc[] = {
0x00, /* 00: set/reset map */
0x00, /* 01: enable set/reset */
0x00, /* 02: color compare */
0x00, /* 03: data rotate */
0x00, /* 04: read map select */
0x10, /* 05: graphics mode */
0x0e, /* 06: miscellaneous */
0x00, /* 07: color don't care */
0xff /* 08: bit mask */
};

/* attribute controller registers */
static const uint8_t vga_atc[] = {
0x00, /* 00: internal palette 0 */
0x01, /* 01: internal palette 1 */
0x02, /* 02: internal palette 2 */
0x03, /* 03: internal palette 3 */
0x04, /* 04: internal palette 4 */
0x05, /* 05: internal palette 5 */
0x14, /* 06: internal palette 6 */
0x07, /* 07: internal palette 7 */
0x38, /* 08: internal palette 8 */
0x39, /* 09: internal palette 9 */
0x3a, /* 0A: internal palette 10 */
0x3b, /* 0B: internal palette 11 */
0x3c, /* 0C: internal palette 12 */
0x3d, /* 0D: internal palette 13 */
0x3e, /* 0E: internal palette 14 */
0x3f, /* 0F: internal palette 15 */
0x0c, /* 10: attribute mode control */
WSDISPLAY_BORDER_COLOR, /* 11: overscan color */
0x0f, /* 12: color plane enable */
0x08, /* 13: horizontal PEL panning */
0x00 /* 14: color select */
};

/* video DAC palette registers */
/* XXX only set up 16 colors used by internal palette in ATC registers */
static const uint8_t vga_dacpal[] = {
/* R G B */
0x00, 0x00, 0x00, /* BLACK */
0x00, 0x00, 0x2a, /* BLUE */
0x00, 0x2a, 0x00, /* GREEN */
0x00, 0x2a, 0x2a, /* CYAN */
0x2a, 0x00, 0x00, /* RED */
0x2a, 0x00, 0x2a, /* MAGENTA */
0x2a, 0x15, 0x00, /* BROWN */
0x2a, 0x2a, 0x2a, /* LIGHTGREY */
0x15, 0x15, 0x15, /* DARKGREY */
0x15, 0x15, 0x3f, /* LIGHTBLUE */
0x15, 0x3f, 0x15, /* LIGHTGREEN */
0x15, 0x3f, 0x3f, /* LIGHTCYAN */
0x3f, 0x15, 0x15, /* LIGHTRED */
0x3f, 0x15, 0x3f, /* LIGHTMAGENTA */
0x3f, 0x3f, 0x15, /* YELLOW */
0x3f, 0x3f, 0x3f /* WHITE */
};

void
vga_initregs(struct vga_handle *vh)
{
int i;

/* disable video */
vga_ts_write(vh, mode, vga_ts[1] | VGA_TS_MODE_BLANK);

/* synchronous reset */
vga_ts_write(vh, syncreset, 0x01);
/* set TS registers */
for (i = 2; i < VGA_TS_NREGS; i++)
_vga_ts_write(vh, i, vga_ts[i]);
/* clear synchronous reset */
vga_ts_write(vh, syncreset, 0x03);

/* unprotect CRTC registers */
vga_6845_write(vh, vsynce, vga_6845_read(vh, vsynce) & ~0x80);
/* set CRTC registers */
for (i = 0; i < MC6845_NREGS; i++)
_vga_6845_write(vh, i, vga_crtc[i]);

/* set GDC registers */
for (i = 0; i < VGA_GDC_NREGS; i++)
_vga_gdc_write(vh, i, vga_gdc[i]);

/* set ATC registers */
for (i = 0; i < VGA_ATC_NREGS; i++)
_vga_attr_write(vh, i, vga_atc[i]);

/* set DAC palette */
if (!vh->vh_mono) {
for (i = 0; i < 16; i++) {
vga_raw_write(vh,
VGA_DAC_ADDRW, vga_atc[i]);
vga_raw_write(vh,
VGA_DAC_PALETTE, vga_dacpal[i * 3 + 0]);
vga_raw_write(vh,
VGA_DAC_PALETTE, vga_dacpal[i * 3 + 1]);
vga_raw_write(vh,
VGA_DAC_PALETTE, vga_dacpal[i * 3 + 2]);
}
}

/* set misc output register */
vga_raw_write(vh,
VGA_MISC_DATAW, VGA_MISCOUT | (vh->vh_mono ? 0 : 0x01));

/* reenable video */
vga_ts_write(vh, mode, vga_ts[1] & ~VGA_TS_MODE_BLANK);
}