/* $NetBSD: pm3fb.c,v 1.15 2026/02/17 09:40:54 macallan Exp $ */

/*
 * Copyright (c) 2015 Naruaki Etomi
 * 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.
 */

/*
 * A console driver for Permedia 3 graphics controllers
 * most of the following was adapted from the xf86-video-glint driver's
 * pm3_accel.c, pm3_dac.c and pm2fb framebuffer console driver
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pm3fb.c,v 1.15 2026/02/17 09:40:54 macallan Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/lwp.h>
#include <sys/kauth.h>
#include <sys/atomic.h>

#include <dev/videomode/videomode.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pciio.h>
#include <dev/pci/pm3reg.h>

#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wsfont/wsfont.h>
#include <dev/rasops/rasops.h>
#include <dev/wscons/wsdisplay_vconsvar.h>
#include <dev/wscons/wsdisplay_glyphcachevar.h>
#include <dev/pci/wsdisplay_pci.h>

#include <dev/i2c/i2cvar.h>
#include <dev/i2c/i2c_bitbang.h>
#include <dev/i2c/ddcvar.h>
#include <dev/videomode/videomode.h>
#include <dev/videomode/edidvar.h>
#include <dev/videomode/edidreg.h>

#include "opt_pm3fb.h"

struct pm3fb_softc {
        device_t sc_dev;

        pci_chipset_tag_t sc_pc;
        pcitag_t sc_pcitag;

        bus_space_tag_t sc_memt;
        bus_space_tag_t sc_iot;

        bus_space_handle_t sc_regh;
        bus_addr_t sc_fb, sc_reg;
        bus_size_t sc_fbsize, sc_regsize;

        int sc_width, sc_height, sc_depth, sc_stride;
        int sc_locked;
        struct vcons_screen sc_console_screen;
        struct wsscreen_descr sc_defaultscreen_descr;
        const struct wsscreen_descr *sc_screens[1];
        struct wsscreen_list sc_screenlist;
        struct vcons_data vd;
        int sc_mode;
        u_char sc_cmap_red[256];
        u_char sc_cmap_green[256];
        u_char sc_cmap_blue[256];
        /* i2c stuff */
        struct i2c_controller sc_i2c;
        uint8_t sc_edid_data[128];
        struct edid_info sc_ei;
        const struct videomode *sc_videomode;
        glyphcache sc_gc;
};

static int      pm3fb_match(device_t, cfdata_t, void *);
static void     pm3fb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(pm3fb, sizeof(struct pm3fb_softc),
    pm3fb_match, pm3fb_attach, NULL, NULL);

extern const u_char rasops_cmap[768];

static int      pm3fb_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t  pm3fb_mmap(void *, void *, off_t, int);
static void     pm3fb_init_screen(void *, struct vcons_screen *, int, long *);

static int      pm3fb_putcmap(struct pm3fb_softc *, struct wsdisplay_cmap *);
static int      pm3fb_getcmap(struct pm3fb_softc *, struct wsdisplay_cmap *);
static void     pm3fb_init_palette(struct pm3fb_softc *);
static int      pm3fb_putpalreg(struct pm3fb_softc *, uint8_t, uint8_t, uint8_t, uint8_t);

static void     pm3fb_init(struct pm3fb_softc *);
static inline void pm3fb_wait(struct pm3fb_softc *, int);
static void     pm3fb_flush_engine(struct pm3fb_softc *);
static void     pm3fb_rectfill(struct pm3fb_softc *, int, int, int, int, uint32_t);
static void     pm3fb_rectfill_a(void *, int, int, int, int, long);
static void     pm3fb_bitblt(void *, int, int, int, int, int, int, int);

static void     pm3fb_cursor(void *, int, int, int);
static void     pm3fb_putchar(void *, int, int, u_int, long);
static void     pm3fb_putchar_aa(void *, int, int, u_int, long);
static void     pm3fb_copycols(void *, int, int, int, int);
static void     pm3fb_erasecols(void *, int, int, int, long);
static void     pm3fb_copyrows(void *, int, int, int);
static void     pm3fb_eraserows(void *, int, int, long);

struct wsdisplay_accessops pm3fb_accessops = {
        pm3fb_ioctl,
        pm3fb_mmap,
        NULL,    /* alloc_screen */
        NULL,    /* free_screen */
        NULL,    /* show_screen */
        NULL,    /* load_font */
        NULL,    /* pollc */
        NULL     /* scroll */
};

/* I2C glue */
static int pm3fb_i2c_send_start(void *, int);
static int pm3fb_i2c_send_stop(void *, int);
static int pm3fb_i2c_initiate_xfer(void *, i2c_addr_t, int);
static int pm3fb_i2c_read_byte(void *, uint8_t *, int);
static int pm3fb_i2c_write_byte(void *, uint8_t, int);

/* I2C bitbang glue */
static void pm3fb_i2cbb_set_bits(void *, uint32_t);
static void pm3fb_i2cbb_set_dir(void *, uint32_t);
static uint32_t pm3fb_i2cbb_read(void *);

static void pm3_setup_i2c(struct pm3fb_softc *);

static const struct i2c_bitbang_ops pm3fb_i2cbb_ops = {
pm3fb_i2cbb_set_bits,
        pm3fb_i2cbb_set_dir,
        pm3fb_i2cbb_read,
        {
                PM3_DD_SDA_IN,
                PM3_DD_SCL_IN,
                0,
                0
        }
};

/* mode setting stuff */
static int pm3fb_set_pll(struct pm3fb_softc *, int);
static void pm3fb_write_dac(struct pm3fb_softc *, int, uint8_t);
static void pm3fb_set_mode(struct pm3fb_softc *, const struct videomode *);

static inline void
pm3fb_wait(struct pm3fb_softc *sc, int slots)
{
    uint32_t reg;

    do {
                reg = bus_space_read_4(sc->sc_memt, sc->sc_regh,
                    PM3_INPUT_FIFO_SPACE);
        } while (reg <= slots);
}

static void
pm3fb_flush_engine(struct pm3fb_softc *sc)
{

        pm3fb_wait(sc, 2);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FILTER_MODE, PM3_FM_PASS_SYNC);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SYNC, 0);

        do {
                while (bus_space_read_4(sc->sc_memt, sc->sc_regh, PM3_OUTPUT_FIFO_WORDS) == 0);
        } while (bus_space_read_4(sc->sc_memt, sc->sc_regh, PM3_OUTPUT_FIFO) !=
            PM3_SYNC_TAG);
}

static int
pm3fb_match(device_t parent, cfdata_t match, void *aux)
{
        struct pci_attach_args *pa = (struct pci_attach_args *)aux;

        if (PCI_CLASS(pa->pa_class) != PCI_CLASS_DISPLAY)
                return 0;
        if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_3DLABS)
                return 0;

        if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_3DLABS_PERMEDIA3)
                return 100;
        return (0);
}

static void
pm3fb_attach(device_t parent, device_t self, void *aux)
{
        struct pm3fb_softc      *sc = device_private(self);
        struct pci_attach_args  *pa = aux;
        struct rasops_info      *ri;
        struct wsemuldisplaydev_attach_args aa;
        prop_dictionary_t       dict;
        unsigned long           defattr;
        bool                    is_console;
        uint32_t                flags;

        sc->sc_pc = pa->pa_pc;
        sc->sc_pcitag = pa->pa_tag;
        sc->sc_memt = pa->pa_memt;
        sc->sc_iot = pa->pa_iot;
        sc->sc_dev = self;

        pci_aprint_devinfo(pa, NULL);

        /*
         * fill in parameters from properties
         * if we can't get a usable mode via DDC2 we'll use this to pick one,
         * which is why we fill them in with some conservative values that
         * hopefully work as a last resort
         */
        dict = device_properties(self);
        if (!prop_dictionary_get_uint32(dict, "width", &sc->sc_width)) {
                aprint_error("%s: no width property\n", device_xname(self));
                sc->sc_width = 1280;
        }
        if (!prop_dictionary_get_uint32(dict, "height", &sc->sc_height)) {
                aprint_error("%s: no height property\n", device_xname(self));
                sc->sc_height = 1024;
        }
        if (!prop_dictionary_get_uint32(dict, "depth", &sc->sc_depth)) {
                aprint_error("%s: no depth property\n", device_xname(self));
                sc->sc_depth = 8;
        }

        sc->sc_stride = sc->sc_width * (sc->sc_depth >> 3);

        prop_dictionary_get_bool(dict, "is_console", &is_console);

        pci_mapreg_info(pa->pa_pc, pa->pa_tag, 0x14, PCI_MAPREG_TYPE_MEM,
            &sc->sc_fb, &sc->sc_fbsize, &flags);

        if (pci_mapreg_map(pa, 0x10, PCI_MAPREG_TYPE_MEM, 0,
            &sc->sc_memt, &sc->sc_regh, &sc->sc_reg, &sc->sc_regsize)) {
                aprint_error("%s: failed to map registers.\n",
                    device_xname(sc->sc_dev));
        }

        /*
         * Permedia 3 always return 64MB fbsize
         * 16 MB should be enough -- more just wastes map entries
         */
        if (sc->sc_fbsize != 0)
            sc->sc_fbsize = (16 << 20);

        /*
         * Some Power Mac G4 model could not initialize these registers,
         * Power Mac G4 (Mirrored Drive Doors), for example
         */
#if defined(__powerpc__)
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LOCALMEMCAPS, 0x02e311B8);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LOCALMEMTIMINGS, 0x07424905);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LOCALMEMCONTROL, 0x0c000003);
#endif

        aprint_normal("%s: %d MB aperture at 0x%08x\n", device_xname(self),
            (int)(sc->sc_fbsize >> 20), (uint32_t)sc->sc_fb);

        sc->sc_defaultscreen_descr = (struct wsscreen_descr){
                "default",
                0, 0,
                NULL,
                8, 16,
                WSSCREEN_WSCOLORS | WSSCREEN_HILIT,
                NULL
        };

        sc->sc_screens[0] = &sc->sc_defaultscreen_descr;
        sc->sc_screenlist = (struct wsscreen_list){1, sc->sc_screens};
        sc->sc_mode = WSDISPLAYIO_MODE_EMUL;
        sc->sc_locked = 0;

        pm3_setup_i2c(sc);

#ifdef PM3FB_DEBUG
        sc->sc_height -= 200;
#endif

        vcons_init(&sc->vd, sc, &sc->sc_defaultscreen_descr,
            &pm3fb_accessops);

        sc->vd.init_screen = pm3fb_init_screen;
        sc->vd.show_screen_cookie = &sc->sc_gc;
        sc->vd.show_screen_cb = glyphcache_adapt;

        /* init engine here */
        pm3fb_init(sc);

        sc->sc_gc.gc_bitblt = pm3fb_bitblt;
        sc->sc_gc.gc_rectfill = pm3fb_rectfill_a;
        sc->sc_gc.gc_blitcookie = sc;
        sc->sc_gc.gc_rop = 3;

        ri = &sc->sc_console_screen.scr_ri;

        vcons_init_screen(&sc->vd, &sc->sc_console_screen, 1, &defattr);
        sc->sc_console_screen.scr_flags |= VCONS_SCREEN_IS_STATIC;

        pm3fb_rectfill(sc, 0, 0, sc->sc_width, sc->sc_height,
            ri->ri_devcmap[(defattr >> 16) & 0xff]);
        pm3fb_init_palette(sc);

        sc->sc_defaultscreen_descr.textops = &ri->ri_ops;
        sc->sc_defaultscreen_descr.capabilities = ri->ri_caps;
        sc->sc_defaultscreen_descr.nrows = ri->ri_rows;
        sc->sc_defaultscreen_descr.ncols = ri->ri_cols;

        glyphcache_init(&sc->sc_gc, sc->sc_height + 5,
                uimin(2047, (sc->sc_fbsize / sc->sc_stride))
                 - sc->sc_height - 5,
                sc->sc_width,
                ri->ri_font->fontwidth,
                ri->ri_font->fontheight,
                defattr);

        if (is_console) {

                wsdisplay_cnattach(&sc->sc_defaultscreen_descr, ri, 0, 0,
                    defattr);
                vcons_replay_msgbuf(&sc->sc_console_screen);
        }


        aa.console = is_console;
        aa.scrdata = &sc->sc_screenlist;
        aa.accessops = &pm3fb_accessops;
        aa.accesscookie = &sc->vd;

        config_found(sc->sc_dev, &aa, wsemuldisplaydevprint, CFARGS_NONE);
}

static int
pm3fb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
        struct lwp *l)
{
        struct vcons_data *vd = v;
        struct pm3fb_softc *sc = vd->cookie;
        struct wsdisplay_fbinfo *wdf;
        struct vcons_screen *ms = vd->active;

        switch (cmd) {
        case WSDISPLAYIO_GTYPE:
                *(u_int *)data = WSDISPLAY_TYPE_PCIMISC;
                return 0;

        /* PCI config read/write passthrough. */
        case PCI_IOC_CFGREAD:
        case PCI_IOC_CFGWRITE:
                return pci_devioctl(sc->sc_pc, sc->sc_pcitag,
                    cmd, data, flag, l);

        case WSDISPLAYIO_GET_BUSID:
                return wsdisplayio_busid_pci(sc->sc_dev, sc->sc_pc,
                    sc->sc_pcitag, data);

        case WSDISPLAYIO_GINFO:
                if (ms == NULL)
                        return ENODEV;
                wdf = (void *)data;
                wdf->height = ms->scr_ri.ri_height;
                wdf->width = ms->scr_ri.ri_width;
                wdf->depth = ms->scr_ri.ri_depth;
                wdf->cmsize = 256;
                return 0;

        case WSDISPLAYIO_GETCMAP:
                return pm3fb_getcmap(sc,
                    (struct wsdisplay_cmap *)data);

        case WSDISPLAYIO_PUTCMAP:
                return pm3fb_putcmap(sc,
                    (struct wsdisplay_cmap *)data);

        case WSDISPLAYIO_LINEBYTES:
                *(u_int *)data = sc->sc_stride;
                return 0;

        case WSDISPLAYIO_SMODE: {
                int new_mode = *(int*)data;
                if (new_mode != sc->sc_mode) {
                        sc->sc_mode = new_mode;
                        if(new_mode == WSDISPLAYIO_MODE_EMUL) {
                                /* first set the video mode */
                                if (sc->sc_videomode != NULL) {
                                        pm3fb_set_mode(sc, sc->sc_videomode);
                                }
                                /* then initialize the drawing engine */
                                pm3fb_init(sc);
                                pm3fb_init_palette(sc);
                                /* clean out the glyph cache */
                                glyphcache_wipe(&sc->sc_gc);
                                vcons_redraw_screen(ms);
                        } else
                                pm3fb_flush_engine(sc);
                }
                }
                return 0;
        case WSDISPLAYIO_GET_EDID: {
                struct wsdisplayio_edid_info *d = data;
                d->data_size = 128;
                if (d->buffer_size < 128)
                        return EAGAIN;
                return copyout(sc->sc_edid_data, d->edid_data, 128);
        }

        case WSDISPLAYIO_GET_FBINFO: {
                struct wsdisplayio_fbinfo *fbi = data;
                return wsdisplayio_get_fbinfo(&ms->scr_ri, fbi);
        }
        }
        return EPASSTHROUGH;
}

static paddr_t
pm3fb_mmap(void *v, void *vs, off_t offset, int prot)
{
        struct vcons_data *vd = v;
        struct pm3fb_softc *sc = vd->cookie;
        paddr_t pa;

        /* 'regular' framebuffer mmap()ing */
        if (offset < sc->sc_fbsize) {
                pa = bus_space_mmap(sc->sc_memt, sc->sc_fb + offset, 0, prot,
                    BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
                return pa;
        }

        /*
         * restrict all other mappings to processes with superuser privileges
         * or the kernel itself
         */
        if (kauth_authorize_machdep(kauth_cred_get(),
            KAUTH_MACHDEP_UNMANAGEDMEM,
            NULL, NULL, NULL, NULL) != 0) {
                aprint_normal("%s: mmap() rejected.\n",
                    device_xname(sc->sc_dev));
                return -1;
        }

        if ((offset >= sc->sc_fb) && (offset < (sc->sc_fb + sc->sc_fbsize))) {
                pa = bus_space_mmap(sc->sc_memt, offset, 0, prot,
                    BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
                return pa;
        }

        if ((offset >= sc->sc_reg) &&
            (offset < (sc->sc_reg + sc->sc_regsize))) {
                pa = bus_space_mmap(sc->sc_memt, offset, 0, prot,
                    BUS_SPACE_MAP_LINEAR);
                return pa;
        }

#ifdef PCI_MAGIC_IO_RANGE
        /* allow mapping of IO space */
        if ((offset >= PCI_MAGIC_IO_RANGE) &&
            (offset < PCI_MAGIC_IO_RANGE + 0x10000)) {
                pa = bus_space_mmap(sc->sc_iot, offset - PCI_MAGIC_IO_RANGE,
                    0, prot, BUS_SPACE_MAP_LINEAR);
                return pa;
        }
#endif
        return -1;
}

static void
pm3fb_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
        struct pm3fb_softc *sc = cookie;
        struct rasops_info *ri = &scr->scr_ri;

        ri->ri_depth = sc->sc_depth;
        ri->ri_width = sc->sc_width;
        ri->ri_height = sc->sc_height;
        ri->ri_stride = sc->sc_stride;
        ri->ri_flg = RI_CENTER | RI_ENABLE_ALPHA | RI_FULLCLEAR;
        if (sc->sc_depth == 8)
                ri->ri_flg |= RI_8BIT_IS_RGB;

        scr->scr_flags |= VCONS_LOADFONT;

        rasops_init(ri, 0, 0);
        ri->ri_caps = WSSCREEN_WSCOLORS | WSSCREEN_UNDERLINE | WSSCREEN_RESIZE;

        rasops_reconfig(ri, sc->sc_height / ri->ri_font->fontheight,
                    sc->sc_width / ri->ri_font->fontwidth);

        ri->ri_hw = scr;
        ri->ri_ops.copyrows = pm3fb_copyrows;
        ri->ri_ops.copycols = pm3fb_copycols;
        ri->ri_ops.cursor = pm3fb_cursor;
        ri->ri_ops.eraserows = pm3fb_eraserows;
        ri->ri_ops.erasecols = pm3fb_erasecols;
        if (FONT_IS_ALPHA(ri->ri_font)) {
                ri->ri_ops.putchar = pm3fb_putchar_aa;
        } else
                ri->ri_ops.putchar = pm3fb_putchar;
}

static int
pm3fb_putcmap(struct pm3fb_softc *sc, struct wsdisplay_cmap *cm)
{
        u_char *r, *g, *b;
        u_int index = cm->index;
        u_int count = cm->count;
        int i, error;
        u_char rbuf[256], gbuf[256], bbuf[256];

        if (cm->index >= 256 || cm->count > 256 ||
            (cm->index + cm->count) > 256)
                return EINVAL;
        error = copyin(cm->red, &rbuf[index], count);
        if (error)
                return error;
        error = copyin(cm->green, &gbuf[index], count);
        if (error)
                return error;
        error = copyin(cm->blue, &bbuf[index], count);
        if (error)
                return error;

        memcpy(&sc->sc_cmap_red[index], &rbuf[index], count);
        memcpy(&sc->sc_cmap_green[index], &gbuf[index], count);
        memcpy(&sc->sc_cmap_blue[index], &bbuf[index], count);

        r = &sc->sc_cmap_red[index];
        g = &sc->sc_cmap_green[index];
        b = &sc->sc_cmap_blue[index];

        for (i = 0; i < count; i++) {
                pm3fb_putpalreg(sc, index, *r, *g, *b);
                index++;
                r++, g++, b++;
        }
        return 0;
}

static int
pm3fb_getcmap(struct pm3fb_softc *sc, struct wsdisplay_cmap *cm)
{
        u_int index = cm->index;
        u_int count = cm->count;
        int error;

        if (index >= 255 || count > 256 || index + count > 256)
                return EINVAL;

        error = copyout(&sc->sc_cmap_red[index],   cm->red,   count);
        if (error)
                return error;
        error = copyout(&sc->sc_cmap_green[index], cm->green, count);
        if (error)
                return error;
        error = copyout(&sc->sc_cmap_blue[index],  cm->blue,  count);
        if (error)
                return error;

        return 0;
}

static void
pm3fb_init_palette(struct pm3fb_softc *sc)
{
        struct rasops_info *ri = &sc->sc_console_screen.scr_ri;
        int i, j = 0;
        uint8_t cmap[768];

        rasops_get_cmap(ri, cmap, sizeof(cmap));

        for (i = 0; i < 256; i++) {
                sc->sc_cmap_red[i] = cmap[j];
                sc->sc_cmap_green[i] = cmap[j + 1];
                sc->sc_cmap_blue[i] = cmap[j + 2];
                pm3fb_putpalreg(sc, i, cmap[j], cmap[j + 1], cmap[j + 2]);
                j += 3;
        }
}

static int
pm3fb_putpalreg(struct pm3fb_softc *sc, uint8_t idx, uint8_t r, uint8_t g, uint8_t b)
{

        pm3fb_wait(sc, 4);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_PAL_WRITE_IDX, idx);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_PAL_DATA, r);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_PAL_DATA, g);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_PAL_DATA, b);
        return 0;
}

static void
pm3fb_write_dac(struct pm3fb_softc *sc, int reg, uint8_t data)
{

        pm3fb_wait(sc, 3);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_INDEX_LOW, reg & 0xff);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_INDEX_HIGH, (reg >> 8) & 0xff);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM3_DAC_INDEX_DATA, data);
}

static void
pm3fb_init(struct pm3fb_softc *sc)
{

        pm3fb_wait(sc, 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LB_DESTREAD_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LB_DESTREAD_ENABLES, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LB_SOURCEREAD_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LB_WRITE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FILTER_MODE, PM3_FM_PASS_SYNC);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_STATISTIC_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DELTA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RASTERIZER_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SCISSOR_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LINESTIPPLE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_AREASTIPPLE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_GID_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DEPTH_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_STENCIL_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_STENCIL_DATA, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_COLORDDA_MODE, 0);

        pm3fb_wait(sc, 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTUREADDRESS_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTUREINDEX_MODE0, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTUREINDEX_MODE1, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTUREREAD_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXELLUT_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTUREFILTER_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTURECOMPOSITE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTURECOLOR_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTURECOMPOSITECOLOR_MODE1, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTURECOMPOSITEALPHA_MODE1, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTURECOMPOSITECOLOR_MODE0, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_TEXTURECOMPOSITEALPHA_MODE0, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FOG_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CHROMATEST_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_ALPHATEST_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_ANTIALIAS_MODE, 0);

        pm3fb_wait(sc, 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_YUV_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_ALPHABLENDCOLOR_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_ALPHABLENDALPHA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DITHER_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_LOGICALOP_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_ROUTER_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_WINDOW, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CONFIG2D, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SPANCOLORMASK, 0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_XBIAS, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_YBIAS, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DELTACONTROL, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_BITMASKPATTERN, 0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBDESTREAD_ENABLE,
            PM3_FBDESTREAD_SET(0xff, 0xff, 0xff));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBDESTREAD_BUFFERADDRESS0, 0);

        pm3fb_wait(sc, 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBDESTREAD_BUFFEROFFSET0, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBDESTREAD_BUFFERWIDTH0,
            PM3_FBDESTREAD_BUFFERWIDTH_WIDTH(sc->sc_stride));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FB_DESTREAD_MODE,
            PM3_FBDRM_ENABLE | PM3_FBDRM_ENABLE0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBSOURCEREAD_BUFFERADDRESS, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBSOURCEREAD_BUFFEROFFSET, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBSOURCEREAD_BUFFERWIDTH,
            PM3_FBSOURCEREAD_BUFFERWIDTH_WIDTH(sc->sc_stride));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBSOURCEREAD_MODE,
            PM3_FBSOURCEREAD_MODE_BLOCKING | PM3_FBSOURCEREAD_MODE_ENABLE);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_PIXEL_SIZE, PM3_PS_8BIT);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBSOFTWAREWRITEMASK, 0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBHARDWAREWRITEMASK, 0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBWRITE_MODE,
            PM3_FBWRITEMODE_WRITEENABLE | PM3_FBWRITEMODE_OPAQUESPAN | PM3_FBWRITEMODE_ENABLE0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBWRITEBUFFERADDRESS0, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBWRITEBUFFEROFFSET0, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBWRITEBUFFERWIDTH0,
            PM3_FBWRITEBUFFERWIDTH_WIDTH(sc->sc_stride));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SIZEOF_FRAMEBUFFER, 4095);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DITHER_MODE, PM3_CF_TO_DIM_CF(4));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DXDOM, 0);

        pm3fb_wait(sc, 6);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DXSUB, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DY, 1 << 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_STARTXDOM, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_STARTXSUB, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_STARTY, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_COUNT, 0);
}

static void
pm3fb_rectfill(struct pm3fb_softc *sc, int x, int y, int wi, int he,
     uint32_t colour)
{
        pm3fb_wait(sc, 4);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CONFIG2D,
            PM3_CONFIG2D_USECONSTANTSOURCE | PM3_CONFIG2D_FOREGROUNDROP_ENABLE | 
            (PM3_CONFIG2D_FOREGROUNDROP(0x3)) | PM3_CONFIG2D_FBWRITE_ENABLE);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FOREGROUNDCOLOR, colour);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RECTANGLEPOSITION,
            (((y) & 0xffff) << 16) | ((x) & 0xffff) );

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RENDER2D,
            PM3_RENDER2D_XPOSITIVE | PM3_RENDER2D_YPOSITIVE | 
            PM3_RENDER2D_OPERATION_NORMAL | PM3_RENDER2D_SPANOPERATION | 
            (((he) & 0x0fff) << 16) | ((wi) & 0x0fff));

#ifdef PM3FB_DEBUG
        pm3fb_flush_engine(sc);
#endif
}

static void
pm3fb_rectfill_a(void *cookie, int x, int y, int wi, int he, long attr)
{
        struct pm3fb_softc *sc = cookie;

        pm3fb_rectfill(sc, x, y, wi, he,
            sc->vd.active->scr_ri.ri_devcmap[(attr >> 24 & 0xf)]);
}

static void
pm3fb_bitblt(void *cookie, int srcx, int srcy, int dstx, int dsty,
    int width, int height, int rop)
{
        struct pm3fb_softc *sc = cookie;
        int x_align,  offset_x, offset_y; 
        uint32_t dir = 0;

        offset_x = srcx - dstx;
        offset_y = srcy - dsty;

        if (dsty <= srcy) {
                dir |= PM3_RENDER2D_YPOSITIVE;
        }

        if (dstx <= srcx) {
                dir |= PM3_RENDER2D_XPOSITIVE;
        }

        x_align = (srcx & 0x1f);

        pm3fb_wait(sc, 6);

        if (rop == 3){ 
                bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CONFIG2D,
                    PM3_CONFIG2D_USERSCISSOR_ENABLE | PM3_CONFIG2D_FOREGROUNDROP_ENABLE | PM3_CONFIG2D_BLOCKING |
                    PM3_CONFIG2D_FOREGROUNDROP(rop) | PM3_CONFIG2D_FBWRITE_ENABLE);
        } else {
                bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CONFIG2D,
                    PM3_CONFIG2D_USERSCISSOR_ENABLE | PM3_CONFIG2D_FOREGROUNDROP_ENABLE | PM3_CONFIG2D_BLOCKING |
                    PM3_CONFIG2D_FOREGROUNDROP(rop) | PM3_CONFIG2D_FBWRITE_ENABLE | PM3_CONFIG2D_FBDESTREAD_ENABLE);
        }

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SCISSORMINXY,
            ((dsty & 0x0fff) << 16) | (dstx & 0x0fff));

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SCISSORMAXXY,
            (((dsty + height) & 0x0fff) << 16) | ((dstx + width) & 0x0fff));

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FBSOURCEREAD_BUFFEROFFSET,
            (((offset_y) & 0xffff) << 16) | ((offset_x) & 0xffff));

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RECTANGLEPOSITION,
            (((dsty) & 0xffff) << 16) | ((dstx - x_align) & 0xffff));

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RENDER2D,
            dir |
            PM3_RENDER2D_OPERATION_NORMAL | PM3_RENDER2D_SPANOPERATION | PM3_RENDER2D_FBSOURCEREADENABLE |
            (((height) & 0x0fff) << 16) | ((width + x_align) & 0x0fff));

#ifdef PM3FB_DEBUG
        pm3fb_flush_engine(sc);
#endif
}

static void
pm3fb_cursor(void *cookie, int on, int row, int col)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        int x, y, wi, he;

        wi = ri->ri_font->fontwidth;
        he = ri->ri_font->fontheight;

        if (sc->sc_mode == WSDISPLAYIO_MODE_EMUL) {
                x = ri->ri_ccol * wi + ri->ri_xorigin;
                y = ri->ri_crow * he + ri->ri_yorigin;
                if (ri->ri_flg & RI_CURSOR) {
                        pm3fb_bitblt(sc, x, y, x, y, wi, he, 12);
                        ri->ri_flg &= ~RI_CURSOR;
                }
                ri->ri_crow = row;
                ri->ri_ccol = col;
                if (on) {
                        x = ri->ri_ccol * wi + ri->ri_xorigin;
                        y = ri->ri_crow * he + ri->ri_yorigin;
                        pm3fb_bitblt(sc, x, y, x, y, wi, he, 12);
                        ri->ri_flg |= RI_CURSOR;
                }
        } else {
                scr->scr_ri.ri_crow = row;
                scr->scr_ri.ri_ccol = col;
                scr->scr_ri.ri_flg &= ~RI_CURSOR;
        }
}

static void
pm3fb_putchar(void *cookie, int row, int col, u_int c, long attr)
{
        struct rasops_info *ri = cookie;
        struct wsdisplay_font *font = PICK_FONT(ri, c);
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        uint32_t mode;

        if (sc->sc_mode == WSDISPLAYIO_MODE_EMUL) {
                void *data;
                uint32_t fg, bg;
                int uc, i;
                int x, y, wi, he;

                wi = font->fontwidth;
                he = font->fontheight;

                if (!CHAR_IN_FONT(c, font))
                        return;

                bg = ri->ri_devcmap[(attr >> 16) & 0xf];
                fg = ri->ri_devcmap[(attr >> 24) & 0xf];
                x = ri->ri_xorigin + col * wi;
                y = ri->ri_yorigin + row * he;
                if (c == 0x20) {
                        pm3fb_rectfill(sc, x, y, wi, he, bg);
                } else {
                        uc = c - font->firstchar;
                        data = (uint8_t *)font->data + uc * ri->ri_fontscale;
                        mode = PM3_RM_MASK_MIRROR;

#if BYTE_ORDER == LITTLE_ENDIAN
                        switch (ri->ri_font->stride) {
                        case 1:
                                mode |= 4 << 7; 
                                break;
                        case 2:
                                mode |= 3 << 7;
                                break;
                        }
#else
                        switch (ri->ri_font->stride) {
                        case 1:
                                mode |= 3 << 7;
                                break;
                        case 2:
                                mode |= 2 << 7;
                                break;
                        }
#endif
                        pm3fb_wait(sc, 6);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM3_FOREGROUNDCOLOR, fg);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM3_BACKGROUNDCOLOR, bg);

                        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RASTERIZER_MODE, mode); 

                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM3_CONFIG2D, 
                            PM3_CONFIG2D_USECONSTANTSOURCE | 
                            PM3_CONFIG2D_FOREGROUNDROP_ENABLE | 
                            PM3_CONFIG2D_FOREGROUNDROP(0x03) | 
                            PM3_CONFIG2D_OPAQUESPAN | 
                            PM3_CONFIG2D_FBWRITE_ENABLE);

                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM3_RECTANGLEPOSITION, (((y) & 0xffff)<<16) | ((x) & 0xffff));

                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM3_RENDER2D,
                            PM3_RENDER2D_XPOSITIVE |
                            PM3_RENDER2D_YPOSITIVE |
                            PM3_RENDER2D_OPERATION_SYNCONBITMASK |
                            PM3_RENDER2D_SPANOPERATION |
                            ((wi) & 0x0fff) | (((he) & 0x0fff) << 16));

                        pm3fb_wait(sc, he);

                        switch (ri->ri_font->stride) {
                        case 1: {
                                uint8_t *data8 = data;
                                uint32_t reg;
                                for (i = 0; i < he; i++) {
                                        reg = *data8;
                                        bus_space_write_4(sc->sc_memt,
                                            sc->sc_regh,
                                            PM3_BITMASKPATTERN, reg);
                                        data8++;
                                }
                                break;
                                }
                        case 2: {
                                uint16_t *data16 = data;
                                uint32_t reg;
                                for (i = 0; i < he; i++) {
                                        reg = *data16;
                                        bus_space_write_4(sc->sc_memt,
                                            sc->sc_regh,
                                            PM3_BITMASKPATTERN, reg);
                                        data16++;
                                }
                                break;
                        }
                        }
                }
                if (attr & WSATTR_UNDERLINE)
                        pm3fb_rectfill(sc, x, y + he - 2, wi, 1, fg);

        }
}

static void
pm3fb_putchar_aa(void *cookie, int row, int col, u_int c, long attr)
{
        struct rasops_info *ri = cookie;
        struct wsdisplay_font *font = PICK_FONT(ri, c);
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        uint32_t bg, fg, pixel, latch, aval;
        int i, j, x, y, wi, he, r, g, b;
        int r1, g1, b1, r0, g0, b0, fgo, bgo, shift;
        uint8_t *data8;
        int rv = GC_NOPE, cnt = 0;

        if (sc->sc_mode != WSDISPLAYIO_MODE_EMUL) 
                return;

        if (!CHAR_IN_FONT(c, font))
                return;

        wi = font->fontwidth;
        he = font->fontheight;

        bg = ri->ri_devcmap[(attr >> 16) & 0xf] & 0xff;
        fg = ri->ri_devcmap[(attr >> 24) & 0xf] & 0xff;
        x = ri->ri_xorigin + col * wi;
        y = ri->ri_yorigin + row * he;

        /* if we draw a whitespace we're done here */
        if (c == 0x20) {
                pm3fb_rectfill(sc, x, y, wi, he, bg);
                if (attr & WSATTR_UNDERLINE)
                        pm3fb_rectfill(sc, x, y + he - 2, wi, 1, fg);
                return;
        }

        rv = glyphcache_try(&sc->sc_gc, c, x, y, attr);
        if (rv == GC_OK)
                return;

        data8 = WSFONT_GLYPH(c, font);

        pm3fb_wait(sc, 3);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CONFIG2D,
                    PM3_CONFIG2D_OPAQUESPAN |
                    PM3_CONFIG2D_EXTERNALSOURCEDATA |
                    PM3_CONFIG2D_FBWRITE_ENABLE);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RECTANGLEPOSITION,
            (((y) & 0xffff) << 16) | ((x) & 0xffff) );

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_RENDER2D,
            PM3_RENDER2D_XPOSITIVE | PM3_RENDER2D_YPOSITIVE | 
            PM3_RENDER2D_OPERATION_SYNCONHOSTDATA | PM3_RENDER2D_SPANOPERATION |
            (((he) & 0x0fff) << 16) | ((wi) & 0x0fff));

        /*
         * we need the RGB colours here, so get offsets into rasops_cmap
         */
        fgo = ((attr >> 24) & 0xf) * 3;
        bgo = ((attr >> 16) & 0xf) * 3;

        r0 = rasops_cmap[bgo];
        g0 = rasops_cmap[bgo + 1];
        b0 = rasops_cmap[bgo + 2];
        r1 = rasops_cmap[fgo];
        g1 = rasops_cmap[fgo + 1];
        b1 = rasops_cmap[fgo + 2];

        pm3fb_wait(sc, 20);

        /*
         * we need two loops here because lines have to be padded to full 32bit
         */
        for (i = 0; i < he; i++) {
                shift = 24;
                latch = 0;
                for (j = 0; j < wi; j++) {
                        aval = *data8;
                        if (aval == 0) {
                                pixel = bg;
                        } else if (aval == 255) {
                                pixel = fg;
                        } else {
                                r = aval * r1 + (255 - aval) * r0;
                                g = aval * g1 + (255 - aval) * g0;
                                b = aval * b1 + (255 - aval) * b0;
                                pixel = ((r & 0xe000) >> 8) |
                                        ((g & 0xe000) >> 11) |
                                        ((b & 0xc000) >> 14);
                        }
                        latch |= pixel << shift;
                        shift -= 8;
                        if (shift < 0) {
                                bus_space_write_stream_4(sc->sc_memt, sc->sc_regh,
                                    PM3_SOURCE_DATA, latch);
                                cnt++;
                                if (cnt > 18) {
                                        pm3fb_wait(sc, 20);
                                        cnt = 0;
                                }
                                latch = 0;
                                shift = 24;
                        }
                        data8++;
                }
                if (shift != 24)
                        bus_space_write_stream_4(sc->sc_memt, sc->sc_regh,
                            PM3_SOURCE_DATA, latch);
        }

        if (rv == GC_ADD) {
                glyphcache_add(&sc->sc_gc, c, x, y);
        }

        if (attr & WSATTR_UNDERLINE)
                pm3fb_rectfill(sc, x, y + he - 2, wi, 1, fg);
}

static void
pm3fb_copycols(void *cookie, int row, int srccol, int dstcol, int ncols)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        int32_t xs, xd, y, width, height;

        if ((sc->sc_locked == 0) && (sc->sc_mode == WSDISPLAYIO_MODE_EMUL)) {
                xs = ri->ri_xorigin + ri->ri_font->fontwidth * srccol;
                xd = ri->ri_xorigin + ri->ri_font->fontwidth * dstcol;
                y = ri->ri_yorigin + ri->ri_font->fontheight * row;
                width = ri->ri_font->fontwidth * ncols;
                height = ri->ri_font->fontheight;
                pm3fb_bitblt(sc, xs, y, xd, y, width, height, 3);
        }
}

static void
pm3fb_erasecols(void *cookie, int row, int startcol, int ncols, long fillattr)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        int32_t x, y, width, height, fg, bg, ul;

        if ((sc->sc_locked == 0) && (sc->sc_mode == WSDISPLAYIO_MODE_EMUL)) {
                x = ri->ri_xorigin + ri->ri_font->fontwidth * startcol;
                y = ri->ri_yorigin + ri->ri_font->fontheight * row;
                width = ri->ri_font->fontwidth * ncols;
                height = ri->ri_font->fontheight;
                rasops_unpack_attr(fillattr, &fg, &bg, &ul);

                pm3fb_rectfill(sc, x, y, width, height, ri->ri_devcmap[bg]);
        }
}

static void
pm3fb_copyrows(void *cookie, int srcrow, int dstrow, int nrows)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        int32_t x, ys, yd, width, height;

        if ((sc->sc_locked == 0) && (sc->sc_mode == WSDISPLAYIO_MODE_EMUL)) {
                x = ri->ri_xorigin;
                ys = ri->ri_yorigin + ri->ri_font->fontheight * srcrow;
                yd = ri->ri_yorigin + ri->ri_font->fontheight * dstrow;
                width = ri->ri_emuwidth;
                height = ri->ri_font->fontheight*nrows;
                pm3fb_bitblt(sc, x, ys, x, yd, width, height, 3);
        }
}

static void
pm3fb_eraserows(void *cookie, int row, int nrows, long fillattr)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm3fb_softc *sc = scr->scr_cookie;
        int32_t x, y, width, height, fg, bg, ul;

        if ((sc->sc_locked == 0) && (sc->sc_mode == WSDISPLAYIO_MODE_EMUL)) {
                if (row == 0 && nrows == ri->ri_rows) {
                        x = 0;
                        y = 0;
                        width = sc->sc_width;
                        height = sc->sc_height;
                } else {
                        x = ri->ri_xorigin;
                        y = ri->ri_yorigin + ri->ri_font->fontheight * row;
                        width = ri->ri_emuwidth;
                        height = ri->ri_font->fontheight * nrows;
                }
                rasops_unpack_attr(fillattr, &fg, &bg, &ul);

                pm3fb_rectfill(sc, x, y, width, height, ri->ri_devcmap[bg]);
        }
}

/* should be enough */
#define MODE_IS_VALID(m) (((m)->hdisplay < 2048))

static void
pm3_setup_i2c(struct pm3fb_softc *sc)
{
        int i;

        /* Fill in the i2c tag */
        iic_tag_init(&sc->sc_i2c);
        sc->sc_i2c.ic_cookie = sc;
        sc->sc_i2c.ic_send_start = pm3fb_i2c_send_start;
        sc->sc_i2c.ic_send_stop = pm3fb_i2c_send_stop;
        sc->sc_i2c.ic_initiate_xfer = pm3fb_i2c_initiate_xfer;
        sc->sc_i2c.ic_read_byte = pm3fb_i2c_read_byte;
        sc->sc_i2c.ic_write_byte = pm3fb_i2c_write_byte;
        sc->sc_i2c.ic_exec = NULL;

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DISPLAY_DATA, 0);

        /* zero out the EDID buffer */
        memset(sc->sc_edid_data, 0, 128);

        /* Some monitors don't respond first time */
        i = 0;
        while (sc->sc_edid_data[1] == 0 && i < 10) {
                ddc_read_edid(&sc->sc_i2c, sc->sc_edid_data, 128);
                i++;
        }

        if (edid_parse(&sc->sc_edid_data[0], &sc->sc_ei) != -1) {
                /*
                 * Now pick a mode.
                 */
#ifdef PM3FB_DEBUG
                edid_print(&sc->sc_ei);
#endif
                if ((sc->sc_ei.edid_preferred_mode != NULL)) {
                        struct videomode *m = sc->sc_ei.edid_preferred_mode;
                        if (MODE_IS_VALID(m)) {
                                sc->sc_videomode = m;
                        } else {
                                aprint_error_dev(sc->sc_dev,
                                    "unable to use preferred mode\n");
                        }
                }
                /*
                 * if we can't use the preferred mode go look for the
                 * best one we can support
                 */
                if (sc->sc_videomode == NULL) {
                        struct videomode *m = sc->sc_ei.edid_modes;

                        sort_modes(sc->sc_ei.edid_modes,
                            &sc->sc_ei.edid_preferred_mode,
                            sc->sc_ei.edid_nmodes);
                        if (sc->sc_videomode == NULL)
                                for (int n = 0; n < sc->sc_ei.edid_nmodes; n++)
                                        if (MODE_IS_VALID(&m[n])) {
                                                sc->sc_videomode = &m[n];
                                                break;
                                        }
                }
        }
        if (sc->sc_videomode == NULL) {
                /* no EDID data? */
                sc->sc_videomode = pick_mode_by_ref(sc->sc_width,
                    sc->sc_height, 60);
        }
        if (sc->sc_videomode != NULL) {
                pm3fb_set_mode(sc, sc->sc_videomode);
        }
}

/* I2C bitbanging */
static void pm3fb_i2cbb_set_bits(void *cookie, uint32_t bits)
{
        struct pm3fb_softc *sc = cookie;
        uint32_t out;

        out = bits << 2;        /* bitmasks match the IN bits */

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_DISPLAY_DATA, out);
        delay(100);
}

static void pm3fb_i2cbb_set_dir(void *cookie, uint32_t dir)
{
        /* Nothing to do */
}

static uint32_t pm3fb_i2cbb_read(void *cookie)
{
        struct pm3fb_softc *sc = cookie;
        uint32_t bits;

        bits = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM3_DISPLAY_DATA);
        return bits;
}

/* higher level I2C stuff */
static int
pm3fb_i2c_send_start(void *cookie, int flags)
{

        return (i2c_bitbang_send_start(cookie, flags, &pm3fb_i2cbb_ops));
}

static int
pm3fb_i2c_send_stop(void *cookie, int flags)
{

        return (i2c_bitbang_send_stop(cookie, flags, &pm3fb_i2cbb_ops));
}

static int
pm3fb_i2c_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
{

        return (i2c_bitbang_initiate_xfer(cookie, addr, flags,
            &pm3fb_i2cbb_ops));
}

static int
pm3fb_i2c_read_byte(void *cookie, uint8_t *valp, int flags)
{

        return (i2c_bitbang_read_byte(cookie, valp, flags, &pm3fb_i2cbb_ops));
}

static int
pm3fb_i2c_write_byte(void *cookie, uint8_t val, int flags)
{
        return (i2c_bitbang_write_byte(cookie, val, flags, &pm3fb_i2cbb_ops));
}

static int
pm3fb_set_pll(struct pm3fb_softc *sc, int freq)
{
        uint8_t bf = 0, bpre = 0, bpost = 0;
        int count;
        unsigned long feedback, prescale, postscale, IntRef, VCO, out_freq, diff,  VCOlow, VCOhigh, bdiff = 1000000;

        freq *= 10; /* convert into 100Hz units */

        for (postscale = 0; postscale <= 5; postscale++) {
                /*
                 * It is pointless going through the main loop if all values of
                 * prescale produce an VCO outside the acceptable range
                 */
                prescale = 1;
                feedback = (prescale * (1UL << postscale) * freq) / (2 * PM3_EXT_CLOCK_FREQ);
                VCOlow = (2 * PM3_EXT_CLOCK_FREQ * feedback) / prescale;
                if (VCOlow > PM3_VCO_FREQ_MAX)
                        continue;

                prescale = 255;
                feedback = (prescale * (1UL << postscale) * freq) / (2 * PM3_EXT_CLOCK_FREQ);
                VCOhigh = (2 * PM3_EXT_CLOCK_FREQ * feedback) / prescale;
                if (VCOhigh < PM3_VCO_FREQ_MIN)
                        continue;

                for (prescale = 1; prescale <= 255; prescale++) {
                        IntRef = PM3_EXT_CLOCK_FREQ / prescale;
                        if (IntRef < PM3_INTREF_MIN || IntRef > PM3_INTREF_MAX) {
                                if (IntRef > PM3_INTREF_MAX) {
                                /*
                                 * Hopefully we will get into range as the prescale
                                 * value increases
                                 */
                                        continue;
                                } else {
                                        /*
                                         * already below minimum and it will only get worse
                                         * move to the next postscale value
                                         */
                                        break;
                                }
                        }

                        feedback = (prescale * (1UL << postscale) * freq) / (2 * PM3_EXT_CLOCK_FREQ);

                        if (feedback > 255) {
                                /*
                                 * prescale, feedbackscale & postscale registers
                                 * are only 8 bits wide
                                 */
                                break;
                        } else if (feedback == 255) {
                                count = 1;
                        } else {
                                count = 2;
                        }

                        do {
                                VCO = (2 * PM3_EXT_CLOCK_FREQ * feedback) / prescale;
                                if (VCO >= PM3_VCO_FREQ_MIN && VCO <= PM3_VCO_FREQ_MAX) {
                                        out_freq = VCO / (1UL << postscale);
                                        diff = abs(out_freq - freq);
                                        if (diff < bdiff) {
                                                bdiff = diff;
                                                bf = feedback;
                                                bpre = prescale;
                                                bpost = postscale;
                                                if (diff == 0)
                                                        goto out;
                                        }
                                }
                                feedback++;
                        } while (--count >= 0);
                }
        }
out:
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_CLOCK0_PRE_SCALE, bpre);
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_CLOCK0_FEEDBACK_SCALE, bf);
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_CLOCK0_POST_SCALE, bpost);
        return 0;
}

static void
pm3fb_set_mode(struct pm3fb_softc *sc, const struct videomode *mode)
{
        int t1, t2, t3, t4, stride;
        uint32_t vclk, tmp1;
        uint8_t sync = 0;

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_BYPASS_MASK, 0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_APERTURE1_CONTROL, 0x00000000);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_APERTURE2_CONTROL, 0x00000000);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FIFODISCONNECT, 0x00000007);

        t1 = mode->hsync_start - mode->hdisplay;
        t2 = mode->vsync_start - mode->vdisplay;
        t3 = mode->hsync_end - mode->hsync_start;
        t4 = mode->vsync_end - mode->vsync_start;
        stride = (mode->hdisplay + 31) & ~31;

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_HORIZ_TOTAL,
            (mode->htotal >> 4) - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_HORIZ_SYNC_END,
            (t1 + t3) >> 4);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_HORIZ_SYNC_START,
            (t1 >> 4));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_HORIZ_BLANK_END,
            (mode->htotal - mode->hdisplay) >> 4);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_HORIZ_GATE_END,
            (mode->htotal - mode->hdisplay) >> 4);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SCREEN_STRIDE,
            (stride >> 4));

        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_VERT_TOTAL, mode->vtotal - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_VERT_SYNC_END, t2 + t4 - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_VERT_SYNC_START, t2 - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_VERT_BLANK_END, mode->vtotal - mode->vdisplay);

        /*8bpp*/
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_BYAPERTURE1MODE, PM3_BYAPERTUREMODE_PIXELSIZE_8BIT);
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_BYAPERTURE2MODE, PM3_BYAPERTUREMODE_PIXELSIZE_8BIT);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_VIDEO_CONTROL,
            (PM3_VC_ENABLE | PM3_VC_HSC_ACTIVE_HIGH | PM3_VC_VSC_ACTIVE_HIGH | PM3_VC_PIXELSIZE_8BIT));

        vclk = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM3_V_CLOCK_CTL);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_V_CLOCK_CTL, (vclk & 0xFFFFFFFC));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_SCREEN_BASE, 0x0);

        tmp1 = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM3_CHIP_CONFIG);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_CHIP_CONFIG, tmp1 & 0xFFFFFFFD);

        pm3fb_set_pll(sc, mode->dot_clock);

        if (mode->flags & VID_PHSYNC)
                sync |= PM3_SC_HSYNC_ACTIVE_HIGH;
        if (mode->flags & VID_PVSYNC)
                sync |= PM3_SC_VSYNC_ACTIVE_HIGH;

        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            PM3_RD_PM3_INDEX_CONTROL, PM3_INCREMENT_DISABLE);
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_SYNC_CONTROL, sync);
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_DAC_CONTROL, 0x00);

        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_PIXEL_SIZE, PM3_DACPS_8BIT);
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_COLOR_FORMAT,
            (PM3_CF_ORDER_RGB | PM3_CF_VISUAL_256_COLOR));
        pm3fb_write_dac(sc, PM3_RAMDAC_CMD_MISC_CONTROL, PM3_MC_DAC_SIZE_8BIT);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM3_FIFOCONTROL, 0x00000905);

        sc->sc_width = mode->hdisplay;
        sc->sc_height = mode->vdisplay;
        sc->sc_depth = 8;
        sc->sc_stride = stride;
        aprint_normal_dev(sc->sc_dev, "pm3 using %d x %d in 8 bit, stride %d\n",
            sc->sc_width, sc->sc_height, stride);
}