/*      $NetBSD: topcat.c,v 1.15 2025/05/27 18:44:31 tsutsui Exp $      */
/*      $OpenBSD: topcat.c,v 1.15 2006/08/11 18:33:13 miod Exp $        */

/*
 * Copyright (c) 2005, Miodrag Vallat.
 * 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.
 *
 */
/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 * from: Utah $Hdr: grf_tc.c 1.20 93/08/13$
 *
 *      @(#)grf_tc.c    8.4 (Berkeley) 1/12/94
 */

/*
 * Graphics routines for TOPCAT, CATSEYE and KATHMANDU frame buffers
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/bus.h>
#include <sys/cpu.h>

#include <machine/autoconf.h>

#include <hp300/dev/dioreg.h>
#include <hp300/dev/diovar.h>
#include <hp300/dev/diodevs.h>
#include <hp300/dev/intiovar.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/rasops/rasops.h>

#include <hp300/dev/diofbreg.h>
#include <hp300/dev/diofbvar.h>
#include <hp300/dev/topcatreg.h>

struct  topcat_softc {
        device_t        sc_dev;
        struct diofb    *sc_fb;
        struct diofb    sc_fb_store;
        int             sc_scode;
};

static int      topcat_dio_match(device_t, cfdata_t, void *);
static void     topcat_dio_attach(device_t, device_t, void *);
static int      topcat_intio_match(device_t, cfdata_t, void *);
static void     topcat_intio_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(topcat_dio, sizeof(struct topcat_softc),
    topcat_dio_match, topcat_dio_attach, NULL, NULL);

CFATTACH_DECL_NEW(topcat_intio, sizeof(struct topcat_softc),
    topcat_intio_match, topcat_intio_attach, NULL, NULL);

static void     topcat_end_attach(struct topcat_softc *, uint8_t);
static int      topcat_reset(struct diofb *, int, struct diofbreg *);
static void     topcat_restore(struct diofb *);
static int      topcat_setcmap(struct diofb *, struct wsdisplay_cmap *);
static void     topcat_setcolor(struct diofb *, u_int);
static int      topcat_windowmove(struct diofb *, uint16_t, uint16_t, uint16_t,
                    uint16_t, uint16_t, uint16_t, int16_t, int16_t);

static int      topcat_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static void     topcat_putchar8(void *, int, int, u_int, long);
static void     topcat_putchar1_4(void *, int, int, u_int, long);

static struct wsdisplay_accessops topcat_accessops = {
        .ioctl        = topcat_ioctl,
        .mmap         = diofb_mmap,
        .alloc_screen = diofb_alloc_screen,
        .free_screen  = diofb_free_screen,
        .show_screen  = diofb_show_screen,
        .load_font    = NULL,
};

/*
 * Attachment glue
 */

int
topcat_intio_match(device_t parent, cfdata_t cf, void *aux)
{
        struct intio_attach_args *ia = aux;
        struct diofbreg *fbr;

        if (strcmp("fb", ia->ia_modname) != 0)
                return 0;

        fbr = (struct diofbreg *)ia->ia_addr;

        if (badaddr((void *)fbr))
                return 0;

        if (fbr->id == GRFHWID) {
                switch (fbr->fbid) {
                case GID_TOPCAT:
                case GID_LRCATSEYE:
                case GID_HRCCATSEYE:
                case GID_HRMCATSEYE:
#if 0
                case GID_XXXCATSEYE:
#endif
                        return 1;
                }
        }

        return 0;
}

void
topcat_intio_attach(device_t parent, device_t self, void *aux)
{
        struct topcat_softc *sc = device_private(self);
        struct intio_attach_args *ia = aux;
        struct diofbreg *fbr;

        sc->sc_dev = self;
        fbr = (struct diofbreg *)ia->ia_addr;
        sc->sc_scode = CONSCODE_INTERNAL;

        if (sc->sc_scode == conscode) {
                sc->sc_fb = &diofb_cn;
        } else {
                sc->sc_fb = &sc->sc_fb_store;
                topcat_reset(sc->sc_fb, sc->sc_scode, fbr);
        }

        topcat_end_attach(sc, fbr->fbid);
}

int
topcat_dio_match(device_t parent, cfdata_t cf, void *aux)
{
        struct dio_attach_args *da = aux;

        if (da->da_id == DIO_DEVICE_ID_FRAMEBUFFER) {
                switch (da->da_secid) {
                case DIO_DEVICE_SECID_TOPCAT:
                case DIO_DEVICE_SECID_LRCATSEYE:
                case DIO_DEVICE_SECID_HRCCATSEYE:
                case DIO_DEVICE_SECID_HRMCATSEYE:
#if 0
                case DIO_DEVICE_SECID_XXXCATSEYE:
#endif
                        return 1;
                }
        }

        return 0;
}

void
topcat_dio_attach(device_t parent, device_t self, void *aux)
{
        struct topcat_softc *sc = device_private(self);
        struct dio_attach_args *da = aux;
        bus_space_handle_t bsh;
        struct diofbreg *fbr;

        sc->sc_dev = self;
        sc->sc_scode = da->da_scode;
        if (sc->sc_scode == conscode) {
                fbr = (struct diofbreg *)conaddr;       /* already mapped */
                sc->sc_fb = &diofb_cn;
        } else {
                sc->sc_fb = &sc->sc_fb_store;
                if (bus_space_map(da->da_bst, da->da_addr, da->da_size, 0,
                    &bsh)) {
                        aprint_error(": can't map framebuffer\n");
                        return;
                }
                fbr = bus_space_vaddr(da->da_bst, bsh);
                if (topcat_reset(sc->sc_fb, sc->sc_scode, fbr) != 0) {
                        aprint_error(": can't reset framebuffer\n");
                        return;
                }
        }

        topcat_end_attach(sc, fbr->fbid);
}

void
topcat_end_attach(struct topcat_softc *sc, uint8_t id)
{
        const char *fbname = "unknown";

        switch (id) {
        case GID_TOPCAT:
                switch (sc->sc_fb->planes) {
                case 1:
                        if (sc->sc_fb->dheight == 400)
                                fbname = "HP98542 topcat";
                        else
                                fbname = "HP98544 topcat";
                        break;
                case 4:
                        if (sc->sc_fb->dheight == 400)
                                fbname = "HP98543 topcat";
                        else
                                fbname = "HP98545 topcat";
                        break;
                case 6:
                        fbname = "HP98547 topcat";
                        break;
                }
                break;
        case GID_HRCCATSEYE:
                fbname = "HP98550 catseye";     /* also A1416 kathmandu */
                break;
        case GID_LRCATSEYE:
                fbname = "HP98549 catseye";
                break;
        case GID_HRMCATSEYE:
                fbname = "HP98548 catseye";
                break;
        }

        diofb_end_attach(sc->sc_dev, &topcat_accessops, sc->sc_fb,
            sc->sc_scode == conscode, fbname);
}

/*
 * Initialize hardware and display routines.
 */
int
topcat_reset(struct diofb *fb, int scode, struct diofbreg *fbr)
{
        volatile struct tcboxfb *tc = (struct tcboxfb *)fbr;
        struct rasops_info *ri = &fb->ri;
        int rc;
        u_int i;
        bool sparse = false;

        if ((rc = diofb_fbinquire(fb, scode, fbr)) != 0)
                return rc;

        /*
         * If we could not get a valid number of planes, determine it
         * by writing to the first frame buffer display location,
         * then reading it back.
         */
        if (fb->planes == 0) {
                volatile uint8_t *fbp;
                uint8_t save;

                fbp = (uint8_t *)fb->fbkva;
                tc->fben = ~0;
                tc->wen = ~0;
                tc->ren = ~0;
                tc->prr = RR_COPY;
                save = *fbp;
                *fbp = 0xff;
                fb->planemask = *fbp;
                *fbp = save;

                for (fb->planes = 1; fb->planemask >= (1 << fb->planes);
                    fb->planes++);
                if (fb->planes > 8)
                        fb->planes = 8;
                fb->planemask = (1 << fb->planes) - 1;
        }

        /*
         * Some displays, such as the HP332 and HP340 internal video
         * and HP98542/98543 appear to return a display width of 1024
         * instead of 512. It looks these boards have actually have
         * enough 64KB (1bpp) or 256KB (4bpp) VRAM and RAMDAC capabilities
         * to display 1024x400 pixels.
         *
         * However HP's official "Service Information Manual" for
         * "HP 900 Series 300 Computers Models 330/350" says:
         *  "The medium-resolution board uses eight memory chips per plane.
         *   This is enough to display 512 doubled pixels by 400 scan lines."
         *
         * This "512 doubled pixels" implies that the native HP-UX treated
         * these 1024x400 framebuffers as pseudo 512x400 ones because
         * ancient 1980s CRTs (such as 35741) didn't display such higher
         * resolution. Furthermore, even modern LCDs can only handle
         * upto 720 pixels in the "400 line" as VGA compatible mode.
         *
         * As mentioned above, we treat these 1024x400 1 bit or 4 bit
         * framebuffers as "2 bytes per pixel" ones, so we have to handle
         * 512 pixels per line with 1024 bytes per line.
         */
        if (fb->planes <= 4 && fb->dwidth == 1024 && fb->dheight == 400) {
                fb->dwidth = 512;
                sparse = true;
        }

        fb->bmv = topcat_windowmove;
        topcat_restore(fb);
        diofb_fbsetup(fb);
        if (!sparse) {
                /* save original rasops putchar op */
                fb->wsputchar = ri->ri_ops.putchar;
                ri->ri_ops.putchar = topcat_putchar8;
        } else {
                ri->ri_ops.putchar = topcat_putchar1_4;
                /* copycols and erasecols ops require byte size of fontwidth */
                fb->wsd.fontwidth *= 2;
                /* copyrows and eraserows ops require byte size per line */
                ri->ri_emuwidth *= 2;
        }
        for (i = 0; i <= fb->planemask; i++)
                topcat_setcolor(fb, i);

        return 0;
}

void
topcat_restore(struct diofb *fb)
{
        volatile struct tcboxfb *tc = (struct tcboxfb *)fb->regkva;

        /*
         * Catseye looks a lot like a topcat, but not completely.
         * So, we set some bits to make it work.
         */
        if (tc->regs.fbid != GID_TOPCAT) {
                while ((tc->catseye_status & 1))
                        ;
                tc->catseye_status = 0x0;
                tc->vb_select = 0x0;
                tc->tcntrl = 0x0;
                tc->acntrl = 0x0;
                tc->pncntrl = 0x0;
                tc->rug_cmdstat = 0x90;
        }

        /*
         * Enable reading/writing of all the planes.
         */
        tc->fben = fb->planemask;
        tc->wen  = fb->planemask;
        tc->ren  = fb->planemask;
        tc->prr  = RR_COPY;

        /* Enable display */
        tc->nblank = fb->planemask;
}

int
topcat_ioctl(void *v, void *vs, u_long cmd, void *data, int flags,
    struct lwp *l)
{
        struct diofb *fb = v;
        struct wsdisplay_fbinfo *wdf;
        u_int i;

        switch (cmd) {
        case WSDISPLAYIO_GTYPE:
                *(u_int *)data = WSDISPLAY_TYPE_TOPCAT;
                return 0;
        case WSDISPLAYIO_SMODE:
                fb->mapmode = *(u_int *)data;
                if (fb->mapmode == WSDISPLAYIO_MODE_EMUL) {
                        topcat_restore(fb);
                        for (i = 0; i <= fb->planemask; i++)
                                topcat_setcolor(fb, i);
                }
                return 0;
        case WSDISPLAYIO_GINFO:
                wdf = (void *)data;
                wdf->width = fb->ri.ri_width;
                wdf->height = fb->ri.ri_height;
                wdf->depth = fb->ri.ri_depth;
                wdf->cmsize = 1 << fb->planes;
                return 0;
        case WSDISPLAYIO_LINEBYTES:
                *(u_int *)data = fb->ri.ri_stride;
                return 0;
        case WSDISPLAYIO_GETCMAP:
                if (fb->planemask == 1)
                        return EPASSTHROUGH;
                return diofb_getcmap(fb, (struct wsdisplay_cmap *)data);
        case WSDISPLAYIO_PUTCMAP:
                if (fb->planemask == 1)
                        return EPASSTHROUGH;
                return topcat_setcmap(fb, (struct wsdisplay_cmap *)data);
        case WSDISPLAYIO_GVIDEO:
        case WSDISPLAYIO_SVIDEO:
                return EPASSTHROUGH;
        }

        return EPASSTHROUGH;
}

void
topcat_setcolor(struct diofb *fb, u_int index)
{
        volatile struct tcboxfb *tc = (struct tcboxfb *)fb->regkva;

        /* No color map registers on monochrome framebuffers. */
        if (fb->planemask == 1)
                return;

        tc_waitbusy(tc, fb->planemask);

        if (tc->regs.fbid != GID_TOPCAT) {
                tccm_waitbusy(tc);
                tc->plane_mask = fb->planemask;
                tc->cindex = ~index;
                tc->rdata  = fb->cmap.r[index];
                tc->gdata  = fb->cmap.g[index];
                tc->bdata  = fb->cmap.b[index];
                tc->strobe = 0xff;
                /* XXX delay required on 68020/30 to avoid bus error */
                DELAY(100);

                tccm_waitbusy(tc);
                tc->cindex = 0;
        } else {
                tccm_waitbusy(tc);
                tc->plane_mask = fb->planemask;
                tc->rdata  = fb->cmap.r[index];
                tc->gdata  = fb->cmap.g[index];
                tc->bdata  = fb->cmap.b[index];
                DELAY(1);       /* necessary for at least old HP98543 */
                tc->cindex = ~index;
                DELAY(1);       /* necessary for at least old HP98543 */
                tc->strobe = 0xff;
                /* XXX delay required on 68020/30 to avoid bus error */
                DELAY(100);

                tccm_waitbusy(tc);
                tc->rdata  = 0;
                tc->gdata  = 0;
                tc->bdata  = 0;
                tc->cindex = 0;
        }
}

int
topcat_setcmap(struct diofb *fb, struct wsdisplay_cmap *cm)
{
        uint8_t r[256], g[256], b[256];
        u_int index = cm->index, count = cm->count;
        u_int colcount = 1 << fb->planes;
        int error;

        if (index >= colcount || count > colcount - index)
                return EINVAL;

        if ((error = copyin(cm->red, r, count)) != 0)
                return error;
        if ((error = copyin(cm->green, g, count)) != 0)
                return error;
        if ((error = copyin(cm->blue, b, count)) != 0)
                return error;

        memcpy(fb->cmap.r + index, r, count);
        memcpy(fb->cmap.g + index, g, count);
        memcpy(fb->cmap.b + index, b, count);

        while (count-- != 0)
                topcat_setcolor(fb, index++);

        return 0;
}

/*
 * Accelerated routines
 */

int
topcat_windowmove(struct diofb *fb, uint16_t sx, uint16_t sy,
    uint16_t dx, uint16_t dy, uint16_t cx, uint16_t cy, int16_t rop,
    int16_t planemask)
{
        volatile struct tcboxfb *tc = (struct tcboxfb *)fb->regkva;

        tc_waitbusy(tc, fb->planemask);

        if (planemask != 0xff) {
                tc->wen = planemask ^ 0xff;
                tc->wmrr = rop ^ 0x0f;
                tc->wen = fb->planemask;
        } else {
                tc->wen = planemask;
                tc->wmrr = rop;
        }
        tc->source_y = sy;
        tc->source_x = sx;
        tc->dest_y = dy;
        tc->dest_x = dx;
        tc->wheight = cy;
        tc->wwidth = cx;
        tc->wmove = fb->planemask;

        return 0;
}

static void
topcat_putchar8(void *cookie, int row, int col, u_int uc, long attr)
{
        struct rasops_info *ri = (struct rasops_info *)cookie;
        struct diofb *diofb = ri->ri_hw;
        volatile struct tcboxfb *tc = (struct tcboxfb *)diofb->regkva;

        /* Wait windowmove ops complete before drawing a glyph */
        tc_waitbusy(tc, diofb->planemask);

        /* Call the original rasops putchar */
        (*diofb->wsputchar)(cookie, row, col, uc, attr);
}

/*
 * Put a single character on 1 bpp (98542) or 4 bpp (98543) variants
 * with 1024x400 VRAM to treat them as a pseudo 512x400 bitmap.
 */
static void
topcat_putchar1_4(void *cookie, int row, int col, u_int uc, long attr)
{
        int width, height, cnt, fs;
        uint32_t fb;
        uint8_t *fr, clr[2];
        uint8_t *dp, *rp;
        struct rasops_info *ri;
        struct diofb *diofb;
        volatile struct tcboxfb *tc;

        ri = (struct rasops_info *)cookie;

        if (!CHAR_IN_FONT(uc, ri->ri_font))
                return;

        rp = ri->ri_bits + (row * ri->ri_yscale) +
            (col * ri->ri_xscale * 2);

        height = ri->ri_font->fontheight;
        width = ri->ri_font->fontwidth;
        clr[0] = (uint8_t)ri->ri_devcmap[(attr >> 16) & 0xf];
        clr[1] = (uint8_t)ri->ri_devcmap[(attr >> 24) & 0xf];

        /* Wait windowmove ops complete before drawing a glyph */
        diofb = ri->ri_hw;
        tc = (struct tcboxfb *)diofb->regkva;
        tc_waitbusy(tc, diofb->planemask);

        /*
         * We have to put pixel data to both odd and even addresses
         * to handle "doubled pixels" as noted above.
         */
        if (uc == ' ') {
                uint16_t c = clr[0];

                c = c << 8 | c;
                while (height--) {
                        dp = rp;
                        rp += ri->ri_stride;

                        for (cnt = width; cnt; cnt--) {
                                *(uint16_t *)dp = c;
                                dp += 2;
                        }
                }
        } else {
                uc -= ri->ri_font->firstchar;
                fr = (uint8_t *)ri->ri_font->data + uc * ri->ri_fontscale;
                fs = ri->ri_font->stride;

                while (height--) {
                        dp = rp;
                        fb = be32dec(fr);
                        fr += fs;
                        rp += ri->ri_stride;

                        for (cnt = width; cnt; cnt--) {
                                uint16_t c = clr[(fb >> 31) & 1];

                                c = c << 8 | c;
                                *(uint16_t *)dp = c;
                                dp += 2;
                                fb <<= 1;
                        }
                }
        }

        /* Do underline */
        if ((attr & WSATTR_UNDERLINE) != 0) {
                uint16_t c = clr[1];

                c = c << 8 | c;
                rp -= ri->ri_stride * ri->ri_ul.off;

                while (width--) {
                        *(uint16_t *)rp = c;
                        rp += 2;
                }
        }
}

/*
 *   Topcat/catseye console attachment
 */

int
topcatcnattach(bus_space_tag_t bst, bus_addr_t addr, int scode)
{
        bus_space_handle_t bsh;
        void *va;
        struct diofbreg *fbr;
        struct diofb *fb = &diofb_cn;
        int size;

        if (bus_space_map(bst, addr, PAGE_SIZE, 0, &bsh))
                return 1;
        va = bus_space_vaddr(bst, bsh);
        fbr = va;

        if (badaddr(va) || fbr->id != GRFHWID) {
                bus_space_unmap(bst, bsh, PAGE_SIZE);
                return 1;
        }

        switch (fbr->fbid) {
        case GID_TOPCAT:
        case GID_LRCATSEYE:
        case GID_HRCCATSEYE:
        case GID_HRMCATSEYE:
                break;

        default:
                bus_space_unmap(bst, bsh, PAGE_SIZE);
                return 1;
        }

        size = DIO_SIZE(scode, va);

        bus_space_unmap(bst, bsh, PAGE_SIZE);
        if (bus_space_map(bst, addr, size, 0, &bsh))
                return 1;
        va = bus_space_vaddr(bst, bsh);

        /*
         * Initialize the framebuffer hardware.
         */
        conscode = scode;
        conaddr = va;
        topcat_reset(fb, conscode, (struct diofbreg *)conaddr);

        /*
         * Initialize the terminal emulator.
         */
        diofb_cnattach(fb);
        return 0;
}