/*      $NetBSD: grf_et.c,v 1.41 2023/12/20 00:40:42 thorpej Exp $ */

/*
 * Copyright (c) 1997 Klaus Burkert
 * Copyright (c) 1996 Tobias Abt
 * 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: grf_et.c,v 1.41 2023/12/20 00:40:42 thorpej Exp $");

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

/*
 * Graphics routines for Tseng ET4000 (&W32) boards,
 *
 * This code offers low-level routines to access Tseng ET4000
 * graphics-boards from within NetBSD for the Amiga.
 * No warranties for any kind of function at all - this
 * code may crash your hardware and scratch your harddisk.  Use at your
 * own risk.  Freely distributable.
 *
 * Modified for Tseng ET4000 from
 * Kari Mettinen's Cirrus driver by Tobias Abt
 *
 * Fixed Merlin in Z-III, fixed LACE and DBLSCAN, added Domino16M proto
 * and AT&T ATT20c491 DAC, added memory-size detection by Klaus Burkert.
 *
 *
 * TODO:
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/device_impl.h>    /* XXX autoconf abuse */

#include <machine/cpu.h>
#include <dev/cons.h>
#if NWSDISPLAY > 0
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/rasops/rasops.h>
#include <dev/wscons/wsdisplay_vconsvar.h>
#endif
#ifdef TSENGCONSOLE
#include <amiga/dev/itevar.h>
#endif
#include <amiga/amiga/device.h>
#include <amiga/dev/grfioctl.h>
#include <amiga/dev/grfvar.h>
#include <amiga/dev/grf_etreg.h>
#include <amiga/dev/zbusvar.h>

int     et_mondefok(struct grfvideo_mode *);
void    et_boardinit(struct grf_softc *);
static void et_CompFQ(u_int fq, u_char *, u_char *);
int     et_getvmode(struct grf_softc *, struct grfvideo_mode *);
int     et_setvmode(struct grf_softc *, unsigned int);
int     et_toggle(struct grf_softc *, unsigned short);
int     et_getcmap(struct grf_softc *, struct grf_colormap *);
int     et_putcmap(struct grf_softc *, struct grf_colormap *);
#ifndef TSENGCONSOLE
void    et_off(struct grf_softc *);
#endif
void    et_inittextmode(struct grf_softc *);
int     et_ioctl(register struct grf_softc *, u_long cmd, void *);
int     et_getmousepos(struct grf_softc *, struct grf_position *);
void    et_writesprpos(volatile char *ba, short, short);
int     et_setmousepos(struct grf_softc *, struct grf_position *);
static int et_setspriteinfo(struct grf_softc *, struct grf_spriteinfo *);
int     et_getspriteinfo(struct grf_softc *, struct grf_spriteinfo *);
static int et_getspritemax(struct grf_softc *, struct grf_position *);
int     et_setmonitor(struct grf_softc *, struct grfvideo_mode *);
int     et_blank(struct grf_softc *, int);
int     et_isblank(struct grf_softc *);
static int et_getControllerType(struct grf_softc *);
static int et_getDACType(struct grf_softc *);

int     grfetmatch(device_t, cfdata_t, void *);
void    grfetattach(device_t, device_t, void *);
int     grfetprint(void *, const char *);
void    et_memset(volatile unsigned char *, unsigned char, int);

#if NWSDISPLAY > 0
/* wsdisplay acessops, emulops */
static int      et_wsioctl(void *, void *, u_long, void *, int, struct lwp *);
static int      et_get_fbinfo(struct grf_softc *, struct wsdisplayio_fbinfo *);

static void     et_wscursor(void *, int, int, int);
static void     et_wsputchar(void *, int, int, u_int, long);
static void     et_wscopycols(void *, int, int, int, int);
static void     et_wserasecols(void *, int, int, int, long);
static void     et_wscopyrows(void *, int, int, int);
static void     et_wseraserows(void *, int, int, long);
static int      et_wsallocattr(void *, int, int, int, long *);
static int      et_wsmapchar(void *, int, unsigned int *);
#endif  /* NWSDISPLAY > 0 */

/*
 * Graphics display definitions.
 * These are filled by 'grfconfig' using GRFIOCSETMON.
 */
#define monitor_def_max 24
static struct grfvideo_mode monitor_def[24] = {
        {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0},
        {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0},
        {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}
};
static struct grfvideo_mode *monitor_current = &monitor_def[0];

/* Console display definition.
 *   Default hardcoded text mode.  This grf_et is set up to
 *   use one text mode only, and this is it.  You may use
 *   grfconfig to change the mode after boot.
 */
/* Console font */
#ifdef KFONT_8X11
#define TSENGFONT kernel_font_8x11
#define TSENGFONTY 11
#else
#define TSENGFONT kernel_font_8x8
#define TSENGFONTY 8
#endif
extern unsigned char TSENGFONT[];

struct grfettext_mode etconsole_mode = {
        {255, "", 25000000, 640, 480, 4, 640/8, 680/8, 768/8, 800/8,
         481, 491, 493, 525, 0},
        8, TSENGFONTY, 640 / 8, 480 / TSENGFONTY, TSENGFONT, 32, 255
};

/* Console colors */
unsigned char etconscolors[3][3] = {    /* background, foreground, hilite */
        {0, 0x40, 0x50}, {152, 152, 152}, {255, 255, 255}
};

int ettype = 0;         /* oMniBus, Domino or Merlin */
int etctype = 0;        /* ET4000 or ETW32 */
int etdtype = 0;        /* Type of DAC (see grf_etregs.h) */

char etcmap_shift = 0;  /* 6 or 8 bit cmap entries */
unsigned char pass_toggle;      /* passthru status tracker */

unsigned char Merlin_switch = 0;

/*
 * Because all Tseng-boards have 2 configdev entries, one for
 * framebuffer mem and the other for regs, we have to hold onto
 * the pointers globally until we match on both.  This and 'ettype'
 * are the primary obsticles to multiple board support, but if you
 * have multiple boards you have bigger problems than grf_et.
 */
static void *et_fbaddr = 0;     /* framebuffer */
static void *et_regaddr = 0;    /* registers */
static int et_fbsize;           /* framebuffer size */

/* current sprite info, if you add support for multiple boards
 * make this an array or something
 */
struct grf_spriteinfo et_cursprite;

/* sprite bitmaps in kernel stack, you'll need to arrayize these too if
 * you add multiple board support
 */
static unsigned char et_imageptr[8 * 64], et_maskptr[8 * 64];
static unsigned char et_sprred[2], et_sprgreen[2], et_sprblue[2];

#if NWSDISPLAY > 0
static struct wsdisplay_accessops et_accessops = {
        .ioctl          = et_wsioctl,
        .mmap           = grf_wsmmap
};

static struct wsdisplay_emulops et_textops = {
        .cursor         = et_wscursor,
        .mapchar        = et_wsmapchar,
        .putchar        = et_wsputchar,
        .copycols       = et_wscopycols,
        .erasecols      = et_wserasecols,
        .copyrows       = et_wscopyrows,
        .eraserows      = et_wseraserows,
        .allocattr      = et_wsallocattr
};

static struct wsscreen_descr et_defaultscreen = {
        .name           = "default",
        .textops        = &et_textops,
        .fontwidth      = 8,
        .fontheight     = TSENGFONTY,
        .capabilities   = WSSCREEN_HILIT | WSSCREEN_BLINK |
                          WSSCREEN_REVERSE | WSSCREEN_UNDERLINE
};

static const struct wsscreen_descr *et_screens[] = {
        &et_defaultscreen,
};

static struct wsscreen_list et_screenlist = {
        sizeof(et_screens) / sizeof(struct wsscreen_descr *), et_screens
};
#endif  /* NWSDISPLAY > 0 */

/* standard driver stuff */
CFATTACH_DECL_NEW(grfet, sizeof(struct grf_softc),
    grfetmatch, grfetattach, NULL, NULL);

static struct cfdata *cfdata;

int
grfetmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct zbus_args *zap;
        static int regprod, regprod2 = 0, fbprod;

        zap = aux;

#ifndef TSENGCONSOLE
        if (amiga_realconfig == 0)
                return (0);
#endif

        /* Grab the first board we encounter as the preferred one.  This will
         * allow one board to work in a multiple Tseng board system, but not
         * multiple boards at the same time.  */
        if (ettype == 0) {
                switch (zap->manid) {
                    case OMNIBUS:
                        if (zap->prodid != 0)
                                return (0);
                        regprod = 0;
                        fbprod = 0;
                        break;
                    case DOMINO:
                        /* 2167/3 is Domino16M proto (crest) */
                        if (zap->prodid != 3 && zap->prodid != 2 && zap->prodid != 1)
                                return (0);
                        regprod = 2;
                        regprod2 = 3;
                        fbprod = 1;
                        break;
                    case MERLIN:
                        if (zap->prodid != 3 && zap->prodid != 4)
                                return (0);
                        regprod = 4;
                        fbprod = 3;
                        break;
                    default:
                        return (0);
                }
                ettype = zap->manid;
        } else {
                if (ettype != zap->manid) {
                        return (0);
                }
        }

        /* Configure either registers or framebuffer in any order */
        /* as said before, oMniBus does not support ProdID */
        if (ettype == OMNIBUS) {
                if (zap->size == 64 * 1024) {
                        /* register area */
                        et_regaddr = zap->va;
                } else {
                        /* memory area */
                        et_fbaddr = zap->va;
                        et_fbsize = zap->size;
                }
        } else {
                if (zap->prodid == regprod || zap->prodid == regprod2) {
                        et_regaddr = zap->va;
                } else {
                        if (zap->prodid == fbprod) {
                                et_fbaddr = zap->va;
                                et_fbsize = zap->size;
                        } else {
                                return (0);
                        }
                }
        }

#ifdef TSENGCONSOLE
        if (amiga_realconfig == 0) {
                cfdata = cf;
        }
#endif

        return (1);
}


void
grfetattach(device_t parent, device_t self, void *aux)
{
        static struct grf_softc congrf;
        static char attachflag = 0;
        struct device temp;
        struct grf_softc *gp;

        printf("\n");

        /* make sure both halves have matched */
        if (!et_regaddr || !et_fbaddr)
                return;

        /* do all that messy console/grf stuff */
        if (self == NULL) {
                gp = &congrf;
                gp->g_device = &temp;
                temp.dv_private = gp;
        } else {
                gp = device_private(self);
                gp->g_device = self;
        }

        if (self != NULL && congrf.g_regkva != 0) {
                /*
                 * inited earlier, just copy (not device struct)
                 */
                memcpy(&gp->g_display, &congrf.g_display,
                    (char *) &gp[1] - (char *) &gp->g_display);
        } else {
                gp->g_regkva = (volatile void *) et_regaddr;
                gp->g_fbkva = (volatile void *) et_fbaddr;

                gp->g_unit = GRF_ET4000_UNIT;
                gp->g_mode = et_mode;
#if NITE > 0
                gp->g_conpri = grfet_cnprobe();
#endif
                gp->g_flags = GF_ALIVE;

                /* wakeup the board */
                et_boardinit(gp);

#ifdef TSENGCONSOLE
#if NWSDISPLAY > 0
                gp->g_accessops = &et_accessops;
                gp->g_emulops = &et_textops;
                gp->g_defaultscr = &et_defaultscreen;
                gp->g_scrlist = &et_screenlist;
#else
#if NITE > 0
                grfet_iteinit(gp);
#endif
#endif  /* NWSDISPLAY > 0 */
                (void) et_load_mon(gp, &etconsole_mode);
#endif
        }

        /*
         * attach grf (once)
         */
        if (amiga_config_found(cfdata, gp->g_device, gp, grfetprint,
                               CFARGS_NONE)) {
                attachflag = 1;
                printf("grfet: %dMB ", et_fbsize / 0x100000);
                switch (ettype) {
                    case OMNIBUS:
                        printf("oMniBus");
                        break;
                    case DOMINO:
                        printf("Domino");
                        break;
                    case MERLIN:
                        printf("Merlin");
                        break;
                }
                printf(" with ");
                switch (etctype) {
                    case ET4000:
                        printf("Tseng ET4000");
                        break;
                    case ETW32:
                        printf("Tseng ETW32");
                        break;
                }
                printf(" and ");
                switch (etdtype) {
                    case SIERRA11483:
                        printf("Sierra SC11483 DAC");
                        break;
                    case SIERRA15025:
                        printf("Sierra SC15025 DAC");
                        break;
                    case MUSICDAC:
                        printf("MUSIC DAC");
                        break;
                    case MERLINDAC:
                        printf("BrookTree Bt482 DAC");
                        break;
                    case ATT20C491:
                        printf("AT&T ATT20c491 DAC");
                        break;
                }
                printf(" being used\n");
        } else {
                if (!attachflag)
                        printf("grfet unattached!!\n");
        }
}


int
grfetprint(void *aux, const char *pnp)
{
        if (pnp)
                aprint_normal("ite at %s: ", pnp);
        return (UNCONF);
}


void
et_boardinit(struct grf_softc *gp)
{
        volatile unsigned char *ba = gp->g_regkva;
        int     x;

        /* wakeup board and flip passthru OFF */

        RegWakeup(ba);
        RegOnpass(ba);

        if (ettype == MERLIN) {
                /* Merlin needs some special initialisations */
                vgaw(ba, MERLIN_SWITCH_REG, 0);
                delay(20000);
                vgaw(ba, MERLIN_SWITCH_REG, 8);
                delay(20000);
                vgaw(ba, MERLIN_SWITCH_REG, 0);
                delay(20000);
                vgaw(ba, MERLIN_VDAC_DATA, 1);

                vgaw(ba, MERLIN_VDAC_INDEX, 0x00);
                vgaw(ba, MERLIN_VDAC_SPRITE,  0xff);
                vgaw(ba, MERLIN_VDAC_INDEX, 0x01);
                vgaw(ba, MERLIN_VDAC_SPRITE,  0x0f);
                vgaw(ba, MERLIN_VDAC_INDEX, 0x02);
                vgaw(ba, MERLIN_VDAC_SPRITE,  0x42);
                vgaw(ba, MERLIN_VDAC_INDEX, 0x03);
                vgaw(ba, MERLIN_VDAC_SPRITE,  0x00);

                vgaw(ba, MERLIN_VDAC_DATA, 0);
        }


        /* setup initial unchanging parameters */

        vgaw(ba, GREG_HERCULESCOMPAT + ((ettype == DOMINO) ? 0x0fff : 0), 0x03);
        vgaw(ba, GREG_DISPMODECONTROL, 0xa0);
        vgaw(ba, GREG_MISC_OUTPUT_W, 0x63);

        if (ettype == DOMINO)
        {
                vgaw(ba, CRT_ADDRESS, CRT_ID_VIDEO_CONFIG1);
                vgaw(ba, CRT_ADDRESS_W + 0x0fff,
                    0xc0 | vgar(ba, CRT_ADDRESS_R + 0x0fff));
        }

        WSeq(ba, SEQ_ID_RESET, 0x03);
        WSeq(ba, SEQ_ID_CLOCKING_MODE, 0x21);   /* 8 dot, Display off */
        WSeq(ba, SEQ_ID_MAP_MASK, 0x0f);
        WSeq(ba, SEQ_ID_CHAR_MAP_SELECT, 0x00);
        WSeq(ba, SEQ_ID_MEMORY_MODE, 0x0e);
        WSeq(ba, SEQ_ID_STATE_CONTROL, 0x00);
        WSeq(ba, SEQ_ID_AUXILIARY_MODE, 0xf4);

        WCrt(ba, CRT_ID_PRESET_ROW_SCAN, 0x00);
        WCrt(ba, CRT_ID_CURSOR_START, 0x00);
        WCrt(ba, CRT_ID_CURSOR_END, 0x08);
        WCrt(ba, CRT_ID_START_ADDR_HIGH, 0x00);
        WCrt(ba, CRT_ID_START_ADDR_LOW, 0x00);
        WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
        WCrt(ba, CRT_ID_CURSOR_LOC_LOW, 0x00);

        WCrt(ba, CRT_ID_UNDERLINE_LOC, 0x67);
        WCrt(ba, CRT_ID_MODE_CONTROL, 0xc3);
        WCrt(ba, CRT_ID_LINE_COMPARE, 0xff);

        /* ET4000 special */
        WCrt(ba, CRT_ID_RASCAS_CONFIG, 0x28);
        WCrt(ba, CRT_ID_EXT_START, 0x00);
        WCrt(ba, CRT_ID_6845_COMPAT, 0x08);

        /* ET4000/W32 special (currently only for Merlin (crest) */
        if (ettype == MERLIN) {
                WCrt(ba, CRT_ID_SEGMENT_COMP, 0x1c);
                WCrt(ba, CRT_ID_GENERAL_PURPOSE, 0x00);
                WCrt(ba, CRT_ID_VIDEO_CONFIG1, 0x93);
        }
        else {
                WCrt(ba, CRT_ID_VIDEO_CONFIG1, 0xd3);
        }

        WCrt(ba, CRT_ID_VIDEO_CONFIG2, 0x0f);
        WCrt(ba, CRT_ID_HOR_OVERFLOW, 0x00);

        vgaw(ba, GREG_SEGMENTSELECT, 0x00);

        WGfx(ba, GCT_ID_SET_RESET, 0x00);
        WGfx(ba, GCT_ID_ENABLE_SET_RESET, 0x00);
        WGfx(ba, GCT_ID_COLOR_COMPARE, 0x00);
        WGfx(ba, GCT_ID_DATA_ROTATE, 0x00);
        WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x00);
        WGfx(ba, GCT_ID_GRAPHICS_MODE, 0x40);
        WGfx(ba, GCT_ID_MISC, 0x01);
        WGfx(ba, GCT_ID_COLOR_XCARE, 0x0f);
        WGfx(ba, GCT_ID_BITMASK, 0xff);

        for (x = 0; x < 0x10; x++)
                WAttr(ba, x, x);
        WAttr(ba, ACT_ID_ATTR_MODE_CNTL, 0x01);
        WAttr(ba, ACT_ID_OVERSCAN_COLOR, 0x00);
        WAttr(ba, ACT_ID_COLOR_PLANE_ENA, 0x0f);
        WAttr(ba, ACT_ID_HOR_PEL_PANNING, 0x00);
        WAttr(ba, ACT_ID_COLOR_SELECT, 0x00);
        WAttr(ba, ACT_ID_MISCELLANEOUS, 0x00);

        vgaw(ba, VDAC_MASK, 0xff);
        delay(200000);
        vgaw(ba, GREG_MISC_OUTPUT_W, 0xe3);

        /* colors initially set to greyscale */
        switch(ettype) {
            case MERLIN:
                vgaw(ba, MERLIN_VDAC_INDEX, 0);
                for (x = 255; x >= 0; x--) {
                        vgaw(ba, MERLIN_VDAC_COLORS, x);
                        vgaw(ba, MERLIN_VDAC_COLORS, x);
                        vgaw(ba, MERLIN_VDAC_COLORS, x);
                }
                break;
            default:
                vgaw(ba, VDAC_ADDRESS_W, 0);
                for (x = 255; x >= 0; x--) {
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0), x);
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0), x);
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0), x);
                }
                break;
        }
        /* set sprite bitmap pointers */
        /* should work like that */
        et_cursprite.image = et_imageptr;
        et_cursprite.mask = et_maskptr;
        et_cursprite.cmap.red = et_sprred;
        et_cursprite.cmap.green = et_sprgreen;
        et_cursprite.cmap.blue = et_sprblue;

        /* card specific initialisations */
        switch(ettype) {
            case OMNIBUS:
                etctype = et_getControllerType(gp);
                etdtype = et_getDACType(gp);
                break;
            case MERLIN:
                vgaw(ba, GREG_SEGMENTSELECT2, 0x00);
                if (((vgar(ba, GREG_FEATURE_CONTROL_R) & 12) |
                     (vgar(ba, GREG_STATUS0_R) & 0x60)) == 0x24) {
                        WCrt(ba, CRT_ID_VIDEO_CONFIG2, 0x07);   /* 1Mx4 RAM */
                        et_fbsize = 0x400000;                   /* 4 MB */
                }
                else {
                        /* check for 1MB or 2MB board (crest) */
                        /* has there a 1MB Merlin ever been sold ??? */
                        volatile unsigned long *et_fbtestaddr;
                        et_fbtestaddr = (volatile unsigned long *)gp->g_fbkva;
                        *et_fbtestaddr = 0x0;
                        vgaw(ba, GREG_SEGMENTSELECT2, 0x11); /* 1MB offset */
                        *et_fbtestaddr = 0x12345678;
                        vgaw(ba, GREG_SEGMENTSELECT2, 0x00);
                        if (*et_fbtestaddr == 0x0)
                                et_fbsize = 0x200000;           /* 2 MB */
                        else
                                et_fbsize = 0x100000;           /* 1 MB */
                }
                /* ZorroII can map 2 MB max ... */
                if (!iszthreepa(kvtop(__UNVOLATILE(gp->g_fbkva))) &&
                    et_fbsize == 0x400000)
                        et_fbsize = 0x200000;
                etctype = ETW32;
                etdtype = MERLINDAC;
                break;
            case DOMINO:
                etctype = ET4000;
                etdtype = et_getDACType(gp);
                break;
        }
}


int
et_getvmode(struct grf_softc *gp, struct grfvideo_mode *vm)
{
        struct grfvideo_mode *gv;

#ifdef TSENGCONSOLE
        /* Handle grabbing console mode */
        if (vm->mode_num == 255) {
                memcpy(vm, &etconsole_mode, sizeof(struct grfvideo_mode));
        /* XXX so grfconfig can tell us the correct text dimensions. */
                vm->depth = etconsole_mode.fy;
        } else
#endif
        {
                if (vm->mode_num == 0)
                        vm->mode_num = (monitor_current - monitor_def) + 1;
                if (vm->mode_num < 1 || vm->mode_num > monitor_def_max)
                        return (EINVAL);
                gv = monitor_def + (vm->mode_num - 1);
                if (gv->mode_num == 0)
                        return (EINVAL);

                memcpy(vm, gv, sizeof(struct grfvideo_mode));
        }

        /* adjust internal values to pixel values */

        vm->hblank_start *= 8;
        vm->hsync_start *= 8;
        vm->hsync_stop *= 8;
        vm->htotal *= 8;

        return (0);
}


int
et_setvmode(struct grf_softc *gp, unsigned mode)
{
        if (!mode || (mode > monitor_def_max) ||
            monitor_def[mode - 1].mode_num == 0)
                return (EINVAL);

        monitor_current = monitor_def + (mode - 1);

        return (0);
}


#ifndef TSENGCONSOLE
void
et_off(struct grf_softc *gp)
{
        char   *ba = gp->g_regkva;

        RegOnpass(ba);
        WSeq(ba, SEQ_ID_CLOCKING_MODE, 0x21);
}
#endif


int
et_blank(struct grf_softc *gp, int on)
{

        WSeq(gp->g_regkva, SEQ_ID_CLOCKING_MODE, on > 0 ? 0x01 : 0x21);
        return 0;
}


int
et_isblank(struct grf_softc *gp)
{
        int r;

        r = RSeq(gp->g_regkva, SEQ_ID_CLOCKING_MODE);
        return (r & 0x20) != 0;
}


/*
 * Change the mode of the display.
 * Return a UNIX error number or 0 for success.
 */
int
et_mode(register struct grf_softc *gp, u_long cmd, void *arg, u_long a2,
        int a3)
{
        int error;

        switch (cmd) {
            case GM_GRFON:
                error = et_load_mon(gp,
                    (struct grfettext_mode *) monitor_current) ? 0 : EINVAL;
                return (error);

            case GM_GRFOFF:
#ifndef TSENGCONSOLE
                et_off(gp);
#else
                et_load_mon(gp, &etconsole_mode);
#endif
                return (0);

            case GM_GRFCONFIG:
                return (0);

            case GM_GRFGETVMODE:
                return (et_getvmode(gp, (struct grfvideo_mode *) arg));

            case GM_GRFSETVMODE:
                error = et_setvmode(gp, *(unsigned *) arg);
                if (!error && (gp->g_flags & GF_GRFON))
                        et_load_mon(gp,
                            (struct grfettext_mode *) monitor_current);
                return (error);

            case GM_GRFGETNUMVM:
                *(int *) arg = monitor_def_max;
                return (0);

            case GM_GRFIOCTL:
                return (et_ioctl(gp, a2, arg));

            default:
                break;
        }

        return (EPASSTHROUGH);
}


int
et_ioctl(register struct grf_softc *gp, u_long cmd, void *data)
{
        switch (cmd) {
            case GRFIOCGSPRITEPOS:
                return (et_getmousepos(gp, (struct grf_position *) data));

            case GRFIOCSSPRITEPOS:
                return (et_setmousepos(gp, (struct grf_position *) data));

            case GRFIOCSSPRITEINF:
                return (et_setspriteinfo(gp, (struct grf_spriteinfo *) data));

            case GRFIOCGSPRITEINF:
                return (et_getspriteinfo(gp, (struct grf_spriteinfo *) data));

            case GRFIOCGSPRITEMAX:
                return (et_getspritemax(gp, (struct grf_position *) data));

            case GRFIOCGETCMAP:
                return (et_getcmap(gp, (struct grf_colormap *) data));

            case GRFIOCPUTCMAP:
                return (et_putcmap(gp, (struct grf_colormap *) data));

            case GRFIOCBITBLT:
                break;

            case GRFTOGGLE:
                return (et_toggle(gp, 0));

            case GRFIOCSETMON:
                return (et_setmonitor(gp, (struct grfvideo_mode *) data));

            case GRFIOCBLANK:
                return (et_blank(gp, *(int *)data));
        }
        return (EPASSTHROUGH);
}


int
et_getmousepos(struct grf_softc *gp, struct grf_position *data)
{
        data->x = et_cursprite.pos.x;
        data->y = et_cursprite.pos.y;

        return (0);
}


void
et_writesprpos(volatile char *ba, short x, short y)
{
}


int
et_setmousepos(struct grf_softc *gp, struct grf_position *data)
{
        volatile char *ba = gp->g_regkva;
        short rx, ry;

        /* no movement */
        if (et_cursprite.pos.x == data->x && et_cursprite.pos.y == data->y)
                return (0);

        /* current and previous real coordinates */
        rx = data->x - et_cursprite.hot.x;
        ry = data->y - et_cursprite.hot.y;

        /* if we are/were on an edge, create (un)shifted bitmap --
         * ripped out optimization (not extremely worthwhile,
         * and kind of buggy anyhow).
         */

        /* do movement, save position */
        et_writesprpos(ba, rx < 0 ? 0 : rx, ry < 0 ? 0 : ry);
        et_cursprite.pos.x = data->x;
        et_cursprite.pos.y = data->y;

        return (0);
}


int
et_getspriteinfo(struct grf_softc *gp, struct grf_spriteinfo *data)
{

        return(EINVAL);
}


static int
et_setspriteinfo(struct grf_softc *gp, struct grf_spriteinfo *data)
{

        return(EINVAL);
}


static int
et_getspritemax(struct grf_softc *gp, struct grf_position *data)
{

        return(EINVAL);
}


int
et_setmonitor(struct grf_softc *gp, struct grfvideo_mode *gv)
{
        struct grfvideo_mode *md;

        if (!et_mondefok(gv))
                return(EINVAL);

#ifdef TSENGCONSOLE
        /* handle interactive setting of console mode */
        if (gv->mode_num == 255) {
                memcpy(&etconsole_mode.gv, gv, sizeof(struct grfvideo_mode));
                etconsole_mode.gv.hblank_start /= 8;
                etconsole_mode.gv.hsync_start /= 8;
                etconsole_mode.gv.hsync_stop /= 8;
                etconsole_mode.gv.htotal /= 8;
                etconsole_mode.rows = gv->disp_height / etconsole_mode.fy;
                etconsole_mode.cols = gv->disp_width / etconsole_mode.fx;
                if (!(gp->g_flags & GF_GRFON))
                        et_load_mon(gp, &etconsole_mode);
#if NITE > 0
                ite_reinit(gp->g_itedev);
#endif
                return (0);
        }
#endif

        md = monitor_def + (gv->mode_num - 1);
        memcpy(md, gv, sizeof(struct grfvideo_mode));

        /* adjust pixel oriented values to internal rep. */

        md->hblank_start /= 8;
        md->hsync_start /= 8;
        md->hsync_stop /= 8;
        md->htotal /= 8;

        return (0);
}


int
et_getcmap(struct grf_softc *gfp, struct grf_colormap *cmap)
{
        volatile unsigned char *ba;
        u_char  red[256], green[256], blue[256], *rp, *gp, *bp;
        short   x;
        int     error;

        if (cmap->count == 0 || cmap->index >= 256)
                return 0;

        if (cmap->count > 256 - cmap->index)
                cmap->count = 256 - cmap->index;

        ba = gfp->g_regkva;
        /* first read colors out of the chip, then copyout to userspace */
        x = cmap->count - 1;

        rp = red + cmap->index;
        gp = green + cmap->index;
        bp = blue + cmap->index;

        switch(ettype) {
            case MERLIN:
                vgaw(ba, MERLIN_VDAC_INDEX, cmap->index);
                do {
                        *rp++ = vgar(ba, MERLIN_VDAC_COLORS);
                        *gp++ = vgar(ba, MERLIN_VDAC_COLORS);
                        *bp++ = vgar(ba, MERLIN_VDAC_COLORS);
                } while (x-- > 0);
                break;
            default:
                vgaw(ba, VDAC_ADDRESS_R+((ettype==DOMINO)?0x0fff:0), cmap->index);
                do {
                        *rp++ = vgar(ba, VDAC_DATA+((ettype==DOMINO)?0x0fff:0)) << etcmap_shift;
                        *gp++ = vgar(ba, VDAC_DATA+((ettype==DOMINO)?0x0fff:0)) << etcmap_shift;
                        *bp++ = vgar(ba, VDAC_DATA+((ettype==DOMINO)?0x0fff:0)) << etcmap_shift;
                } while (x-- > 0);
                break;
        }

        error = copyout(red + cmap->index, cmap->red, cmap->count);
        if (!error)
                error = copyout(green + cmap->index, cmap->green, cmap->count);
        if (!error)
                error = copyout(blue + cmap->index, cmap->blue, cmap->count);

        return (error);
}


int
et_putcmap(struct grf_softc *gfp, struct grf_colormap *cmap)
{
        volatile unsigned char *ba;
        u_char  red[256], green[256], blue[256], *rp, *gp, *bp;
        short   x;
        int     error;

        if (cmap->count == 0 || cmap->index >= 256)
                return (0);

        if (cmap->count > 256 - cmap->index)
                cmap->count = 256 - cmap->index;

        /* first copy the colors into kernelspace */
        if ((error = copyin(cmap->red, red + cmap->index, cmap->count)))
                return (error);

        if ((error = copyin(cmap->green, green + cmap->index, cmap->count)))
                return (error);

        if ((error = copyin(cmap->blue, blue + cmap->index, cmap->count)))
                return (error);

        ba = gfp->g_regkva;
        x = cmap->count - 1;

        rp = red + cmap->index;
        gp = green + cmap->index;
        bp = blue + cmap->index;

        switch(ettype){
            case MERLIN:
                vgaw(ba, MERLIN_VDAC_INDEX, cmap->index);
                do {
                        vgaw(ba, MERLIN_VDAC_COLORS, *rp++);
                        vgaw(ba, MERLIN_VDAC_COLORS, *gp++);
                        vgaw(ba, MERLIN_VDAC_COLORS, *bp++);
                } while (x-- > 0);
                break;
            default:
                vgaw(ba, VDAC_ADDRESS_W, cmap->index);
                do {
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0),
                            *rp++ >> etcmap_shift);
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0),
                            *gp++ >> etcmap_shift);
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0),
                            *bp++ >> etcmap_shift);
                } while (x-- > 0);
                break;
        }

        return (0);
}


int
et_toggle(struct grf_softc *gp, unsigned short wopp)
/* (variable wopp) don't need that one yet, ill */
{
        volatile unsigned char *ba;

        ba = gp->g_regkva;

        if (pass_toggle) {
                RegOffpass(ba);
        } else {
                RegOnpass(ba);
        }
        return (0);
}


#define ET_NUMCLOCKS 32

static u_char et_clocks[ET_NUMCLOCKS] = {
        0, 1, 6, 2, 3, 7, 4, 5,
        0, 1, 6, 2, 3, 7, 4, 5,
        0, 1, 6, 2, 3, 7, 4, 5,
        0, 1, 6, 2, 3, 7, 4, 5
};

static u_char et_clockdividers[ET_NUMCLOCKS] = {
        3, 3, 3, 3, 3, 3, 3, 3,
        2, 2, 2, 2, 2, 2, 2, 2,
        1, 1, 1, 1, 1, 1, 1, 1,
        0, 0, 0, 0, 0, 0, 0, 0
};

static u_int et_clockfreqs[ET_NUMCLOCKS] = {
         6293750,  7080500,  7875000,  8125000,
         9000000,  9375000, 10000000, 11225000,
        12587500, 14161000, 15750000, 16250000,
        18000000, 18750000, 20000000, 22450000,
        25175000, 28322000, 31500000, 32500000,
        36000000, 37500000, 40000000, 44900000,
        50350000, 56644000, 63000000, 65000000,
        72000000, 75000000, 80000000, 89800000
};


static void
et_CompFQ(u_int fq, u_char *num, u_char *denom)
{
        int i;

        for (i=0; i < ET_NUMCLOCKS;) {
                if (fq <= et_clockfreqs[i++]) {
                        break;
                }
        }

        *num = et_clocks[--i];
        *denom = et_clockdividers[i];

        return;
}


int
et_mondefok(struct grfvideo_mode *gv)
{
        unsigned long maxpix;

        if (gv->mode_num < 1 || gv->mode_num > monitor_def_max)
                if (gv->mode_num != 255 || gv->depth != 4)
                        return(0);

        switch (gv->depth) {
            case 4:
                if (gv->mode_num != 255)
                        return(0);
            case 1:
            case 8:
                maxpix = 85000000;
                break;
            case 15:
            case 16:
                maxpix = 45000000;
                break;
            case 24:
                maxpix = 28000000;
                break;
            case 32:
                maxpix = 21000000;
                break;
            default:
                printf("grfet: Illegal depth in mode %d\n",
                        (int) gv->mode_num);
                return (0);
        }

        if (gv->pixel_clock > maxpix) {
                printf("grfet: Pixelclock too high in mode %d\n",
                        (int) gv->mode_num);
                return (0);
        }

        if (gv->disp_flags & GRF_FLAGS_SYNC_ON_GREEN) {
                printf("grfet: sync-on-green is not supported\n");
                return (0);
        }

        return (1);
}


int
et_load_mon(struct grf_softc *gp, struct grfettext_mode *md)
{
        struct grfvideo_mode *gv;
        struct grfinfo *gi;
        volatile unsigned char *ba;
        unsigned char num0, denom0;
        unsigned short HT, HDE, HBS, HBE, HSS, HSE, VDE, VBS, VBE, VSS,
                VSE, VT;
        unsigned char hvsync_pulse, seq;
        char    TEXT;
        int     hmul;

        /* identity */
        gv = &md->gv;
        TEXT = (gv->depth == 4);

        if (!et_mondefok(gv)) {
                printf("grfet: Monitor definition not ok\n");
                return (0);
        }

        ba = gp->g_regkva;

        /* provide all needed information in grf device-independent locations */
        gp->g_data = (void *) gv;
        gi = &gp->g_display;
        gi->gd_regaddr = ztwopa(__UNVOLATILE(ba));
        gi->gd_regsize = 64 * 1024;
        gi->gd_fbaddr = (void *) kvtop(__UNVOLATILE(gp->g_fbkva));
        gi->gd_fbsize = et_fbsize;
        gi->gd_colors = 1 << gv->depth;
        gi->gd_planes = gv->depth;
        gi->gd_fbwidth = gv->disp_width;
        gi->gd_fbheight = gv->disp_height;
        gi->gd_fbx = 0;
        gi->gd_fby = 0;
        if (TEXT) {
                gi->gd_dwidth = md->fx * md->cols;
                gi->gd_dheight = md->fy * md->rows;
        } else {
                gi->gd_dwidth = gv->disp_width;
                gi->gd_dheight = gv->disp_height;
        }
        gi->gd_dx = 0;
        gi->gd_dy = 0;

        /* get display mode parameters */

        HBS = gv->hblank_start;
        HSS = gv->hsync_start;
        HSE = gv->hsync_stop;
        HBE = gv->htotal - 1;
        HT  = gv->htotal;
        VBS = gv->vblank_start;
        VSS = gv->vsync_start;
        VSE = gv->vsync_stop;
        VBE = gv->vtotal - 1;
        VT  = gv->vtotal;

        if (TEXT)
                HDE = ((gv->disp_width + md->fx - 1) / md->fx) - 1;
        else
                HDE = (gv->disp_width + 3) / 8 - 1;     /* HBS; */
        VDE = gv->disp_height - 1;

        /* adjustments (crest) */
        switch (gv->depth) {
            case 15:
            case 16:
                hmul = 2;
                break;
            case 24:
                hmul = 3;
                break;
            case 32:
                hmul = 4;
                break;
            default:
                hmul = 1;
                break;
        }

        HDE *= hmul;
        HBS *= hmul;
        HSS *= hmul;
        HSE *= hmul;
        HBE *= hmul;
        HT  *= hmul;

        if (gv->disp_flags & GRF_FLAGS_LACE) {
                VDE /= 2;
                VT = VT + 1;
        }

        if (gv->disp_flags & GRF_FLAGS_DBLSCAN) {
                VDE *= 2;
                VBS *= 2;
                VSS *= 2;
                VSE *= 2;
                VBE *= 2;
                VT  *= 2;
        }

        WSeq(ba, SEQ_ID_MEMORY_MODE, (TEXT || (gv->depth == 1)) ? 0x06 : 0x0e);

        WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x00);
        WSeq(ba, SEQ_ID_MAP_MASK, (gv->depth == 1) ? 0x01 : 0xff);
        WSeq(ba, SEQ_ID_CHAR_MAP_SELECT, 0x00);

        /* Set clock */
        et_CompFQ( gv->pixel_clock * hmul, &num0, &denom0);

        /* Horizontal/Vertical Sync Pulse */
        hvsync_pulse = 0xe3;
        if (gv->disp_flags & GRF_FLAGS_PHSYNC)
                hvsync_pulse &= ~0x40;
        else
                hvsync_pulse |= 0x40;
        if (gv->disp_flags & GRF_FLAGS_PVSYNC)
                hvsync_pulse &= ~0x80;
        else
                hvsync_pulse |= 0x80;

        vgaw(ba, GREG_MISC_OUTPUT_W, hvsync_pulse | ((num0 & 3) << 2));
        WCrt(ba, CRT_ID_6845_COMPAT, (num0 & 4) ? 0x0a : 0x08);
        seq = RSeq(ba, SEQ_ID_CLOCKING_MODE);
        switch(denom0) {
            case 0:
                WSeq(ba, SEQ_ID_AUXILIARY_MODE, 0xb4);
                WSeq(ba, SEQ_ID_CLOCKING_MODE, seq & 0xf7);
                break;
            case 1:
                WSeq(ba, SEQ_ID_AUXILIARY_MODE, 0xf4);
                WSeq(ba, SEQ_ID_CLOCKING_MODE, seq & 0xf7);
                break;
            case 2:
                WSeq(ba, SEQ_ID_AUXILIARY_MODE, 0xf5);
                WSeq(ba, SEQ_ID_CLOCKING_MODE, seq & 0xf7);
                break;
            case 3:
                WSeq(ba, SEQ_ID_AUXILIARY_MODE, 0xf5);
                WSeq(ba, SEQ_ID_CLOCKING_MODE, seq | 0x08);
                break;
        }

        /* load display parameters into board */
        WCrt(ba, CRT_ID_HOR_TOTAL, HT);
        WCrt(ba, CRT_ID_HOR_DISP_ENA_END, ((HDE >= HBS) ? HBS - 1 : HDE));
        WCrt(ba, CRT_ID_START_HOR_BLANK, HBS);
        WCrt(ba, CRT_ID_END_HOR_BLANK, (HBE & 0x1f) | 0x80);
        WCrt(ba, CRT_ID_START_HOR_RETR, HSS);
        WCrt(ba, CRT_ID_END_HOR_RETR,
            (HSE & 0x1f) |
            ((HBE & 0x20) ? 0x80 : 0x00));
        WCrt(ba, CRT_ID_VER_TOTAL, VT);
        WCrt(ba, CRT_ID_OVERFLOW,
            0x10 |
            ((VT  & 0x100) ? 0x01 : 0x00) |
            ((VDE & 0x100) ? 0x02 : 0x00) |
            ((VSS & 0x100) ? 0x04 : 0x00) |
            ((VBS & 0x100) ? 0x08 : 0x00) |
            ((VT  & 0x200) ? 0x20 : 0x00) |
            ((VDE & 0x200) ? 0x40 : 0x00) |
            ((VSS & 0x200) ? 0x80 : 0x00));

        WCrt(ba, CRT_ID_MAX_ROW_ADDRESS,
            0x40 |              /* splitscreen not visible */
            ((gv->disp_flags & GRF_FLAGS_DBLSCAN) ? 0x80 : 0x00) |
            ((VBS & 0x200) ? 0x20 : 0x00) |
            (TEXT ? ((md->fy - 1) & 0x1f) : 0x00));

        WCrt(ba, CRT_ID_MODE_CONTROL,
            ((TEXT || (gv->depth == 1)) ? 0xc3 : 0xab));

        /* text cursor */
        if (TEXT) {
#if ET_ULCURSOR
                WCrt(ba, CRT_ID_CURSOR_START, (md->fy & 0x1f) - 2);
                WCrt(ba, CRT_ID_CURSOR_END, (md->fy & 0x1f) - 1);
#else
                WCrt(ba, CRT_ID_CURSOR_START, 0x00);
                WCrt(ba, CRT_ID_CURSOR_END, md->fy & 0x1f);
#endif
                WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
                WCrt(ba, CRT_ID_CURSOR_LOC_LOW, 0x00);
        }

        WCrt(ba, CRT_ID_UNDERLINE_LOC, ((md->fy - 1) & 0x1f)
                | ((TEXT || (gv->depth == 1)) ? 0x00 : 0x60));

        WCrt(ba, CRT_ID_START_ADDR_HIGH, 0x00);
        WCrt(ba, CRT_ID_START_ADDR_LOW, 0x00);

        WCrt(ba, CRT_ID_START_VER_RETR, VSS);
        WCrt(ba, CRT_ID_END_VER_RETR, (VSE & 0x0f) | 0x30);
        WCrt(ba, CRT_ID_VER_DISP_ENA_END, VDE);
        WCrt(ba, CRT_ID_START_VER_BLANK, VBS);
        WCrt(ba, CRT_ID_END_VER_BLANK, VBE);

        WCrt(ba, CRT_ID_LINE_COMPARE, 0xff);

        WCrt(ba, CRT_ID_OVERFLOW_HIGH,
            ((VBS & 0x400) ? 0x01 : 0x00) |
            ((VT  & 0x400) ? 0x02 : 0x00) |
            ((VDE & 0x400) ? 0x04 : 0x00) |
            ((VSS & 0x400) ? 0x08 : 0x00) |
            0x10 |
            ((gv->disp_flags & GRF_FLAGS_LACE) ? 0x80 : 0x00));

        WCrt(ba, CRT_ID_HOR_OVERFLOW,
            ((HT  & 0x100) ? 0x01 : 0x00) |
            ((HBS & 0x100) ? 0x04 : 0x00) |
            ((HSS & 0x100) ? 0x10 : 0x00)
        );

        /* depth dependent stuff */

        WGfx(ba, GCT_ID_GRAPHICS_MODE,
            ((TEXT || (gv->depth == 1)) ? 0x00 : 0x40));
        WGfx(ba, GCT_ID_MISC, (TEXT ? 0x04 : 0x01));

        vgaw(ba, VDAC_MASK, 0xff);
        vgar(ba, VDAC_MASK);
        vgar(ba, VDAC_MASK);
        vgar(ba, VDAC_MASK);
        vgar(ba, VDAC_MASK);
        switch (gv->depth) {
            case 1:
            case 4:     /* text */
                switch(etdtype) {
                    case SIERRA11483:
                    case SIERRA15025:
                    case MUSICDAC:
                        vgaw(ba, VDAC_MASK, 0);
                        break;
                    case ATT20C491:
                        vgaw(ba, VDAC_MASK, 0x02);
                        break;
                    case MERLINDAC:
                        setMerlinDACmode(ba, 0);
                        break;
                }
                HDE = gv->disp_width / 16;
                break;
            case 8:
                switch(etdtype) {
                    case SIERRA11483:
                    case SIERRA15025:
                    case MUSICDAC:
                        vgaw(ba, VDAC_MASK, 0);
                        break;
                    case ATT20C491:
                        vgaw(ba, VDAC_MASK, 0x02);
                        break;
                    case MERLINDAC:
                        setMerlinDACmode(ba, 0);
                        break;
                }
                HDE = gv->disp_width / 8;
                break;
            case 15:
                switch(etdtype) {
                    case SIERRA11483:
                    case SIERRA15025:
                    case MUSICDAC:
                    case ATT20C491:
                        vgaw(ba, VDAC_MASK, 0xa0);
                        break;
                    case MERLINDAC:
                        setMerlinDACmode(ba, 0xa0);
                        break;
                }
                HDE = gv->disp_width / 4;
                break;
            case 16:
                switch(etdtype) {
                    case SIERRA11483:
                        vgaw(ba, VDAC_MASK, 0); /* illegal mode! */
                        break;
                    case SIERRA15025:
                        vgaw(ba, VDAC_MASK, 0xe0);
                        break;
                    case MUSICDAC:
                    case ATT20C491:
                        vgaw(ba, VDAC_MASK, 0xc0);
                        break;
                    case MERLINDAC:
                        setMerlinDACmode(ba, 0xe0);
                        break;
                }
                HDE = gv->disp_width / 4;
                break;
            case 24:
                switch(etdtype) {
                    case SIERRA11483:
                        vgaw(ba, VDAC_MASK, 0); /* illegal mode! */
                        break;
                    case SIERRA15025:
                        vgaw(ba, VDAC_MASK, 0xe1);
                        break;
                    case MUSICDAC:
                    case ATT20C491:
                        vgaw(ba, VDAC_MASK, 0xe0);
                        break;
                    case MERLINDAC:
                        setMerlinDACmode(ba, 0xf0);
                        break;
                }
                HDE = (gv->disp_width / 8) * 3;
                break;
            case 32:
                switch(etdtype) {
                    case SIERRA11483:
                    case MUSICDAC:
                    case ATT20C491:
                        vgaw(ba, VDAC_MASK, 0); /* illegal mode! */
                        break;
                    case SIERRA15025:
                        vgaw(ba, VDAC_MASK, 0x61);
                        break;
                    case MERLINDAC:
                        setMerlinDACmode(ba, 0xb0);
                        break;
                }
                HDE = gv->disp_width / 2;
                break;
        }
        WAttr(ba, ACT_ID_ATTR_MODE_CNTL, (TEXT ? 0x0a : 0x01));
        WAttr(ba, 0x20 | ACT_ID_COLOR_PLANE_ENA,
            (gv->depth == 1) ? 0x01 : 0x0f);

        WCrt(ba, CRT_ID_OFFSET, HDE);
        vgaw(ba, CRT_ADDRESS, CRT_ID_HOR_OVERFLOW);
        vgaw(ba, CRT_ADDRESS_W,
                (vgar(ba, CRT_ADDRESS_R) & 0x7f)
                | ((HDE & 0x100) ? 0x80: 0x00));

        /* text initialization */
        if (TEXT) {
                et_inittextmode(gp);
        }

        WSeq(ba, SEQ_ID_CLOCKING_MODE, 0x01);

        /* Pass-through */
        RegOffpass(ba);

        return (1);
}


void
et_inittextmode(struct grf_softc *gp)
{
        struct grfettext_mode *tm = (struct grfettext_mode *) gp->g_data;
        volatile unsigned char *ba = gp->g_regkva;
        volatile unsigned char *fb = gp->g_fbkva;
        volatile unsigned char *c;
        unsigned char *f, y;
        unsigned short z;


        /*
         * load text font into beginning of display memory. Each character
         * cell is 32 bytes long (enough for 4 planes)
         */

        SetTextPlane(ba, 0x02);
        et_memset(fb, 0, 256 * 32);
        c = fb + (32 * tm->fdstart);
        f = tm->fdata;
        for (z = tm->fdstart; z <= tm->fdend; z++, c += (32 - tm->fy))
                for (y = 0; y < tm->fy; y++)
                        *c++ = *f++;

        /* clear out text/attr planes (three screens worth) */

        SetTextPlane(ba, 0x01);
        et_memset(fb, 0x07, tm->cols * tm->rows * 3);
        SetTextPlane(ba, 0x00);
        et_memset(fb, 0x20, tm->cols * tm->rows * 3);

        /* print out a little init msg */

        c = fb + (tm->cols - 16);
        strcpy(__UNVOLATILE(c), "TSENG");
        c[5] = 0x20;

        /* set colors (B&W) */

        switch(ettype) {
            case MERLIN:
                vgaw(ba, MERLIN_VDAC_INDEX, 0);
                for (z = 0; z < 256; z++) {
                        y = (z & 1) ? ((z > 7) ? 2 : 1) : 0;

                        vgaw(ba, MERLIN_VDAC_COLORS, etconscolors[y][0]);
                        vgaw(ba, MERLIN_VDAC_COLORS, etconscolors[y][1]);
                        vgaw(ba, MERLIN_VDAC_COLORS, etconscolors[y][2]);
                }
                break;
            default:
                vgaw(ba, VDAC_ADDRESS_W, 0);
                for (z = 0; z < 256; z++) {
                        y = (z & 1) ? ((z > 7) ? 2 : 1) : 0;

                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0),
                            etconscolors[y][0] >> etcmap_shift);
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0),
                            etconscolors[y][1] >> etcmap_shift);
                        vgaw(ba, VDAC_DATA + ((ettype == DOMINO) ? 0x0fff : 0),
                            etconscolors[y][2] >> etcmap_shift);
                }
                break;
        }
}


void
et_memset(volatile unsigned char *d, unsigned char c, int l)
{
        for (; l > 0; l--)
                *d++ = c;
}


static int
et_getControllerType(struct grf_softc *gp)
{
        volatile unsigned char *ba = gp->g_regkva; /* register base */
        volatile unsigned char *mem = gp->g_fbkva; /* memory base */
        volatile unsigned char *mmu = mem + MMU_APERTURE0; /* MMU aperture 0 base */

        *mem = 0;

        /* make ACL visible */
        if (ettype == MERLIN) {
                WCrt(ba, CRT_ID_VIDEO_CONFIG1, 0xbb);
        } else {
                WCrt(ba, CRT_ID_VIDEO_CONFIG1, 0xfb);
        }

        WIma(ba, IMA_PORTCONTROL, 0x01);

        *((volatile unsigned long *)mmu) = 0;
        *(mem + 0x13) = 0x38;

        *mmu = 0xff;

        /* hide ACL */
        WIma(ba, IMA_PORTCONTROL, 0x00);

        if (ettype == MERLIN) {
                WCrt(ba, CRT_ID_VIDEO_CONFIG1, 0x93);
        } else {
                WCrt(ba, CRT_ID_VIDEO_CONFIG1, 0xd3);
        }
        return ((*mem == 0xff) ? ETW32 : ET4000);
}

/* We MUST do 4 HW reads to switch into command mode */
static inline int vgar4HDR(volatile unsigned char *ba)
{
        return vgar(ba, HDR) + vgar(ba, HDR) + vgar(ba, HDR) + vgar(ba, HDR);
}

static int
et_getDACType(struct grf_softc *gp)
{
        volatile unsigned char *ba = gp->g_regkva;
        union {
                int  tt;
                char cc[4];
        } check;

        /* check for Sierra SC 15025 */

        vgar4HDR(ba);
        vgaw(ba, VDAC_COMMAND, 0x10); /* set ERPF */

        vgaw(ba, VDAC_XINDEX, 9);
        check.cc[0] = vgar(ba, VDAC_XDATA);
        vgaw(ba, VDAC_XINDEX, 10);
        check.cc[1] = vgar(ba, VDAC_XDATA);
        vgaw(ba, VDAC_XINDEX, 11);
        check.cc[2] = vgar(ba, VDAC_XDATA);
        vgaw(ba, VDAC_XINDEX, 12);
        check.cc[3] = vgar(ba, VDAC_XDATA);

        vgar4HDR(ba);
        vgaw(ba, VDAC_COMMAND, 0x00); /* clear ERPF */

        if (check.tt == 0x533ab141) {
                vgar4HDR(ba);
                vgaw(ba, VDAC_COMMAND, 0x10); /* set ERPF */

                /* switch to 8 bits per color */
                vgaw(ba, VDAC_XINDEX, 8);
                vgaw(ba, VDAC_XDATA, 1);
                /* do not shift color values */
                etcmap_shift = 0;

                vgar4HDR(ba);
                vgaw(ba, VDAC_COMMAND, 0x00); /* clear ERPF */

                vgaw(ba, VDAC_MASK, 0xff);
                return (SIERRA15025);
        }

        /* check for MUSIC DAC */

        vgar4HDR(ba);
        vgaw(ba, VDAC_COMMAND, 0x02);   /* set some strange MUSIC mode (???) */

        vgaw(ba, VDAC_XINDEX, 0x01);
        if (vgar(ba, VDAC_XDATA) == 0x01) {
                /* shift color values by 2 */
                etcmap_shift = 2;

                vgaw(ba, VDAC_MASK, 0xff);
                return (MUSICDAC);
        }

        /* check for AT&T ATT20c491 DAC (crest) */
        vgar4HDR(ba);
        vgaw(ba, HDR, 0xff);
        vgaw(ba, VDAC_MASK, 0x01);
        vgar4HDR(ba);
        if (vgar(ba, HDR) == 0xff) {
                /* do not shift color values */
                etcmap_shift = 0;

                vgaw(ba, VDAC_MASK, 0xff);
                return (ATT20C491);
        }

        /* restore PowerUp settings (crest) */
        vgar4HDR(ba);
        vgaw(ba, HDR, 0x00);

        /*
         * nothing else found, so let us pretend it is a stupid
         * Sierra SC 11483
         */

        /* shift color values by 2 */
        etcmap_shift = 2;

        vgaw(ba, VDAC_MASK, 0xff);
        return (SIERRA11483);
}


#if NWSDISPLAY > 0
static void
et_wscursor(void *c, int on, int row, int col) 
{
        struct rasops_info *ri;
        struct vcons_screen *scr;
        struct grf_softc *gp;
        volatile void *ba;
        int offs;

        ri = c;
        scr = ri->ri_hw;
        gp = scr->scr_cookie;
        ba = gp->g_regkva;

        if ((ri->ri_flg & RI_CURSOR) && !on) {
                /* cursor was visible, but we want to remove it */
                /*WCrt(ba, CRT_ID_CURSOR_START, | 0x20);*/
                ri->ri_flg &= ~RI_CURSOR;
        }

        ri->ri_crow = row;
        ri->ri_ccol = col;

        if (on) {
                /* move cursor to new location */
                if (!(ri->ri_flg & RI_CURSOR)) {
                        /*WCrt(ba, CRT_ID_CURSOR_START, | 0x20);*/
                        ri->ri_flg |= RI_CURSOR;
                }
                offs = gp->g_rowoffset[row] + col;
                WCrt(ba, CRT_ID_CURSOR_LOC_LOW, offs & 0xff);
                WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, (offs >> 8) & 0xff);
                WCrt(ba, CRT_ID_EXT_START, (offs >> (16-2)) & 0x0c);
        }
}

static void
et_wsputchar(void *c, int row, int col, u_int ch, long attr)
{
        struct rasops_info *ri;
        struct vcons_screen *scr;
        struct grf_softc *gp;
        volatile unsigned char *ba, *cp;

        ri = c;
        scr = ri->ri_hw;
        gp = scr->scr_cookie;
        ba = gp->g_regkva;
        cp = gp->g_fbkva;

        cp += gp->g_rowoffset[row] + col;
        SetTextPlane(ba, 0x00);
        *cp = ch;
        SetTextPlane(ba, 0x01);
        *cp = attr;
}

static void     
et_wscopycols(void *c, int row, int srccol, int dstcol, int ncols) 
{
        volatile unsigned char *ba, *dst, *src;
        struct rasops_info *ri;
        struct vcons_screen *scr;
        struct grf_softc *gp;
        int i;

        KASSERT(ncols > 0);
        ri = c;
        scr = ri->ri_hw;
        gp = scr->scr_cookie;
        ba = gp->g_regkva;
        src = gp->g_fbkva;

        src += gp->g_rowoffset[row];
        dst = src;
        src += srccol;
        dst += dstcol;
        if (srccol < dstcol) {
                /* need to copy backwards */
                src += ncols;
                dst += ncols;
                SetTextPlane(ba, 0x00);
                for (i = 0; i < ncols; i++)
                        *(--dst) = *(--src);
                src += ncols;
                dst += ncols;
                SetTextPlane(ba, 0x01);
                for (i = 0; i < ncols; i++)
                        *(--dst) = *(--src);
        } else {
                SetTextPlane(ba, 0x00);
                for (i = 0; i < ncols; i++)
                        *dst++ = *src++;
                src -= ncols;
                dst -= ncols;
                SetTextPlane(ba, 0x01);
                for (i = 0; i < ncols; i++)
                        *dst++ = *src++;
        }
}

static void     
et_wserasecols(void *c, int row, int startcol, int ncols, long fillattr)
{
        volatile unsigned char *ba, *cp;
        struct rasops_info *ri;
        struct vcons_screen *scr;
        struct grf_softc *gp;
        int i;

        ri = c;
        scr = ri->ri_hw;
        gp = scr->scr_cookie;
        ba = gp->g_regkva;
        cp = gp->g_fbkva;

        cp += gp->g_rowoffset[row] + startcol;
        SetTextPlane(ba, 0x00);
        for (i = 0; i < ncols; i++)
                *cp++ = 0x20;
        cp -= ncols;
        SetTextPlane(ba, 0x01);
        for (i = 0; i < ncols; i++)
                *cp++ = 0x07;
}

static void     
et_wscopyrows(void *c, int srcrow, int dstrow, int nrows) 
{
        volatile unsigned char *ba, *dst, *src;
        struct rasops_info *ri;
        struct vcons_screen *scr;
        struct grf_softc *gp;
        int i, n;

        KASSERT(nrows > 0);
        ri = c;
        scr = ri->ri_hw;
        gp = scr->scr_cookie;
        ba = gp->g_regkva;
        src = dst = gp->g_fbkva;
        n = ri->ri_cols * nrows;

        if (srcrow < dstrow) {
                /* need to copy backwards */
                src += gp->g_rowoffset[srcrow + nrows];
                dst += gp->g_rowoffset[dstrow + nrows];
                SetTextPlane(ba, 0x00);
                for (i = 0; i < n; i++)
                        *(--dst) = *(--src);
                src += n;
                dst += n;
                SetTextPlane(ba, 0x01);
                for (i = 0; i < n; i++)
                        *(--dst) = *(--src);
        } else {
                src += gp->g_rowoffset[srcrow];
                dst += gp->g_rowoffset[dstrow];
                SetTextPlane(ba, 0x00);
                for (i = 0; i < n; i++)
                        *dst++ = *src++;
                src -= n;
                dst -= n;
                SetTextPlane(ba, 0x01);
                for (i = 0; i < n; i++)
                        *dst++ = *src++;
        }
}

static void     
et_wseraserows(void *c, int row, int nrows, long fillattr) 
{
        volatile unsigned char *ba, *cp;
        struct rasops_info *ri;
        struct vcons_screen *scr;
        struct grf_softc *gp;
        int i, n;

        ri = c;
        scr = ri->ri_hw;
        gp = scr->scr_cookie;
        ba = gp->g_regkva;
        cp = gp->g_fbkva;

        cp += gp->g_rowoffset[row];
        n = ri->ri_cols * nrows;
        SetTextPlane(ba, 0x00);
        for (i = 0; i < n; i++)
                *cp++ = 0x20;
        cp -= n;
        SetTextPlane(ba, 0x01);
        for (i = 0; i < n; i++)
                *cp++ = 0x07;
}

static int
et_wsallocattr(void *c, int fg, int bg, int flg, long *attr)
{

        /* XXX color support? */
        *attr = (flg & WSATTR_REVERSE) ? 0x70 : 0x07;
        if (flg & WSATTR_UNDERLINE)     *attr = 0x01;
        if (flg & WSATTR_HILIT)         *attr |= 0x08;
        if (flg & WSATTR_BLINK)         *attr |= 0x80;
        return 0;
}

/* our font does not support unicode extensions */
static int      
et_wsmapchar(void *c, int ch, unsigned int *cp)
{

        if (ch > 0 && ch < 256) {
                *cp = ch;
                return 5;
        }
        *cp = ' ';
        return 0;
}

static int
et_wsioctl(void *v, void *vs, u_long cmd, void *data, int flag, struct lwp *l)
{
        struct vcons_data *vd;
        struct grf_softc *gp;

        vd = v;
        gp = vd->cookie;

        switch (cmd) {
        case WSDISPLAYIO_GETCMAP:
                /* Note: wsdisplay_cmap and grf_colormap have same format */
                if (gp->g_display.gd_planes == 8)
                        return et_getcmap(gp, (struct grf_colormap *)data);
                return EINVAL;

        case WSDISPLAYIO_PUTCMAP:
                /* Note: wsdisplay_cmap and grf_colormap have same format */
                if (gp->g_display.gd_planes == 8)
                        return et_putcmap(gp, (struct grf_colormap *)data);
                return EINVAL;

        case WSDISPLAYIO_GVIDEO:
                if (et_isblank(gp))
                        *(u_int *)data = WSDISPLAYIO_VIDEO_OFF;
                else
                        *(u_int *)data = WSDISPLAYIO_VIDEO_ON;
                return 0;

        case WSDISPLAYIO_SVIDEO:
                return et_blank(gp, *(u_int *)data == WSDISPLAYIO_VIDEO_ON);

        case WSDISPLAYIO_SMODE:
                if ((*(int *)data) != gp->g_wsmode) {
                        if (*(int *)data == WSDISPLAYIO_MODE_EMUL) {
                                /* load console text mode, redraw screen */
                                (void)et_load_mon(gp, &etconsole_mode);
                                if (vd->active != NULL)
                                        vcons_redraw_screen(vd->active);
                        } else {
                                /* switch to current graphics mode */
                                if (!et_load_mon(gp,
                                    (struct grfettext_mode *)monitor_current))
                                        return EINVAL;
                        }
                        gp->g_wsmode = *(int *)data;
                } 
                return 0;

        case WSDISPLAYIO_GET_FBINFO:
                return et_get_fbinfo(gp, data);
        }

        /* handle this command hw-independent in grf(4) */
        return grf_wsioctl(v, vs, cmd, data, flag, l);
}

/*
 * Fill the wsdisplayio_fbinfo structure with information from the current
 * graphics mode. Even when text mode is active.
 */
static int
et_get_fbinfo(struct grf_softc *gp, struct wsdisplayio_fbinfo *fbi)
{
        struct grfvideo_mode *md;
        uint32_t rbits, gbits, bbits;

        md = monitor_current;

        switch (md->depth) {
        case 8:
                fbi->fbi_bitsperpixel = 8;
                rbits = gbits = bbits = 6;  /* keep gcc happy */
                break;
        case 15:
                fbi->fbi_bitsperpixel = 16;
                rbits = gbits = bbits = 5;
                break;
        case 16:
                fbi->fbi_bitsperpixel = 16;
                rbits = bbits = 5;
                gbits = 6;
                break;
        case 24:
                fbi->fbi_bitsperpixel = 24;
                rbits = gbits = bbits = 8;
                break;
        default:
                return EINVAL;
        }

        fbi->fbi_stride = (fbi->fbi_bitsperpixel / 8) * md->disp_width;
        fbi->fbi_width = md->disp_width;
        fbi->fbi_height = md->disp_height;

        if (md->depth > 8) {
                fbi->fbi_pixeltype = WSFB_RGB;
                fbi->fbi_subtype.fbi_rgbmasks.red_offset = bbits + gbits;
                fbi->fbi_subtype.fbi_rgbmasks.red_size = rbits;
                fbi->fbi_subtype.fbi_rgbmasks.green_offset = bbits;
                fbi->fbi_subtype.fbi_rgbmasks.green_size = gbits;
                fbi->fbi_subtype.fbi_rgbmasks.blue_offset = 0;
                fbi->fbi_subtype.fbi_rgbmasks.blue_size = bbits;
                fbi->fbi_subtype.fbi_rgbmasks.alpha_offset = 0;
                fbi->fbi_subtype.fbi_rgbmasks.alpha_size = 0;
        } else {
                fbi->fbi_pixeltype = WSFB_CI;
                fbi->fbi_subtype.fbi_cmapinfo.cmap_entries = 1 << md->depth;
        }

        fbi->fbi_flags = 0;
        fbi->fbi_fbsize = fbi->fbi_stride * fbi->fbi_height;
        fbi->fbi_fboffset = 0;
        return 0;
}
#endif  /* NWSDISPLAY > 0 */

#endif /* NGRFET */