sys/dev/pci/pm2fb.c

root/sys/dev/pci/pm2fb.c
/*      $NetBSD: pm2fb.c,v 1.38 2026/02/17 09:40:54 macallan Exp $      */

/*
 * Copyright (c) 2009, 2012 Michael Lorenz
 *               2014 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 2 graphics controllers
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pm2fb.c,v 1.38 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/pm2reg.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_pm2fb.h"

#ifdef PM2FB_DEBUG
#define DPRINTF aprint_error
#else
#define DPRINTF while (0) printf
#endif

#if BYTE_ORDER == LITTLE_ENDIAN
/*
 * XXX
 * A temporary workaround for unaligned blits on little endian hardware.
 * This makes pm2fb_bitblt() work well on little endian hardware to get
 * scrolling right, but not much more. Unaligned blits ( as in, where the lower
 * 2 bits of the source and destination X coordinates don't match ) are still
 * wrong so the glyph cache is also disabled.  
 */
#define BITBLT_LE_WORKAROUND
#endif

struct pm2fb_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];
        /* engine stuff */
        uint32_t sc_pprod;
        int sc_is_pm2;
        /* 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      pm2fb_match(device_t, cfdata_t, void *);
static void     pm2fb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(pm2fb, sizeof(struct pm2fb_softc),
    pm2fb_match, pm2fb_attach, NULL, NULL);

extern const u_char rasops_cmap[768];

static int      pm2fb_ioctl(void *, void *, u_long, void *, int,
                             struct lwp *);
static paddr_t  pm2fb_mmap(void *, void *, off_t, int);
static void     pm2fb_init_screen(void *, struct vcons_screen *, int, long *);

static int      pm2fb_putcmap(struct pm2fb_softc *, struct wsdisplay_cmap *);
static int      pm2fb_getcmap(struct pm2fb_softc *, struct wsdisplay_cmap *);
static void     pm2fb_init_palette(struct pm2fb_softc *);
static int      pm2fb_putpalreg(struct pm2fb_softc *, uint8_t, uint8_t,
                            uint8_t, uint8_t);

static void     pm2fb_init(struct pm2fb_softc *);
static inline void pm2fb_wait(struct pm2fb_softc *, int);
static void     pm2fb_flush_engine(struct pm2fb_softc *);
static void     pm2fb_rectfill(struct pm2fb_softc *, int, int, int, int,
                            uint32_t);
static void     pm2fb_rectfill_a(void *, int, int, int, int, long);
static void     pm2fb_bitblt(void *, int, int, int, int, int, int, int);

static void     pm2fb_cursor(void *, int, int, int);
static void     pm2fb_putchar(void *, int, int, u_int, long);
static void     pm2fb_putchar_aa(void *, int, int, u_int, long);
static void     pm2fb_copycols(void *, int, int, int, int);
static void     pm2fb_erasecols(void *, int, int, int, long);
static void     pm2fb_copyrows(void *, int, int, int);
static void     pm2fb_eraserows(void *, int, int, long);

struct wsdisplay_accessops pm2fb_accessops = {
        pm2fb_ioctl,
        pm2fb_mmap,
        NULL,   /* alloc_screen */
        NULL,   /* free_screen */
        NULL,   /* show_screen */
        NULL,   /* load_font */
        NULL,   /* pollc */
        NULL    /* scroll */
};

/* I2C glue */
static int pm2fb_i2c_send_start(void *, int);
static int pm2fb_i2c_send_stop(void *, int);
static int pm2fb_i2c_initiate_xfer(void *, i2c_addr_t, int);
static int pm2fb_i2c_read_byte(void *, uint8_t *, int);
static int pm2fb_i2c_write_byte(void *, uint8_t, int);

/* I2C bitbang glue */
static void pm2fb_i2cbb_set_bits(void *, uint32_t);
static void pm2fb_i2cbb_set_dir(void *, uint32_t);
static uint32_t pm2fb_i2cbb_read(void *);

static void pm2_setup_i2c(struct pm2fb_softc *);

static const struct i2c_bitbang_ops pm2fb_i2cbb_ops = {
        pm2fb_i2cbb_set_bits,
        pm2fb_i2cbb_set_dir,
        pm2fb_i2cbb_read,
        {
                PM2_DD_SDA_IN,
                PM2_DD_SCL_IN,
                0,
                0
        }
};

/* mode setting stuff */
static int pm2fb_set_pll(struct pm2fb_softc *, int);
static int pm2vfb_set_pll(struct pm2fb_softc *, int);
static uint8_t pm2fb_read_dac(struct pm2fb_softc *, int);
static void pm2fb_write_dac(struct pm2fb_softc *, int, uint8_t);
static void pm2fb_set_mode(struct pm2fb_softc *, const struct videomode *);

const struct {
        int vendor;
        int product;
        int flags;
} pm2fb_pci_devices[] = {
        {
                PCI_VENDOR_3DLABS,
                PCI_PRODUCT_3DLABS_PERMEDIA2V,
                0
        },
        {
                PCI_VENDOR_TI,
                PCI_PRODUCT_TI_TVP4020,
                1       
        },
        {
                0,
                0,
                0
        }
};

/* this table is from xf86-video-glint */
#define PARTPROD(a,b,c) (((a)<<6) | ((b)<<3) | (c))
int partprodPermedia[] = {
        -1,
        PARTPROD(0,0,1), PARTPROD(0,1,1), PARTPROD(1,1,1), PARTPROD(1,1,2),
        PARTPROD(1,2,2), PARTPROD(2,2,2), PARTPROD(1,2,3), PARTPROD(2,2,3),
        PARTPROD(1,3,3), PARTPROD(2,3,3), PARTPROD(1,2,4), PARTPROD(3,3,3),
        PARTPROD(1,3,4), PARTPROD(2,3,4),              -1, PARTPROD(3,3,4), 
        PARTPROD(1,4,4), PARTPROD(2,4,4),              -1, PARTPROD(3,4,4), 
                     -1, PARTPROD(2,3,5),              -1, PARTPROD(4,4,4), 
        PARTPROD(1,4,5), PARTPROD(2,4,5), PARTPROD(3,4,5),              -1,
                     -1,              -1,              -1, PARTPROD(4,4,5), 
        PARTPROD(1,5,5), PARTPROD(2,5,5),              -1, PARTPROD(3,5,5), 
                     -1,              -1,              -1, PARTPROD(4,5,5), 
                     -1,              -1,              -1, PARTPROD(3,4,6),
                     -1,              -1,              -1, PARTPROD(5,5,5), 
        PARTPROD(1,5,6), PARTPROD(2,5,6),              -1, PARTPROD(3,5,6),
                     -1,              -1,              -1, PARTPROD(4,5,6),
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1, PARTPROD(5,5,6),
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     -1,              -1,              -1,              -1,
                     0};

static inline void
pm2fb_wait(struct pm2fb_softc *sc, int slots)
{
        uint32_t reg;

        do {
                reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, 
                        PM2_INPUT_FIFO_SPACE);
        } while (reg <= slots);
}

static void
pm2fb_flush_engine(struct pm2fb_softc *sc)
{

        pm2fb_wait(sc, 2);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_FILTER_MODE,
            PM2FLT_PASS_SYNC);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SYNC, 0);
        do {
                while (bus_space_read_4(sc->sc_memt, sc->sc_regh, 
                        PM2_OUTPUT_FIFO_WORDS) == 0);
        } while (bus_space_read_4(sc->sc_memt, sc->sc_regh, PM2_OUTPUT_FIFO) != 
            PM2_SYNC_TAG);
}

static int
pm2fb_match(device_t parent, cfdata_t match, void *aux)
{
        struct pci_attach_args *pa = (struct pci_attach_args *)aux;
        int i;

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

        for (i = 0; pm2fb_pci_devices[i].vendor; i++) {
                if ((PCI_VENDOR(pa->pa_id) == pm2fb_pci_devices[i].vendor &&
                     PCI_PRODUCT(pa->pa_id) == pm2fb_pci_devices[i].product)) 
                        return 100;
        }

        return (0);
}

static void
pm2fb_attach(device_t parent, device_t self, void *aux)
{
        struct pm2fb_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 = FALSE;
        uint32_t                flags;
        int                     i;

        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;

        for (i = 0; pm2fb_pci_devices[i].vendor; i++) {
                if (PCI_PRODUCT(pa->pa_id) == pm2fb_pci_devices[i].product) {
                        sc->sc_is_pm2 = pm2fb_pci_devices[i].flags ;
                        break;
                }
        }

        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 = 1024;
        }
        if (!prop_dictionary_get_uint32(dict, "height", &sc->sc_height)) {
                aprint_error("%s: no height property\n", device_xname(self));
                sc->sc_height = 768;
        }
        if (!prop_dictionary_get_uint32(dict, "depth", &sc->sc_depth)) {
                aprint_error("%s: no depth property\n", device_xname(self));
                sc->sc_depth = 8;
        }

        /*
         * don't look at the linebytes property - The Raptor firmware lies
         * about it. Get it from width * depth >> 3 instead.
         */

        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));
        }

        /*
         * XXX yeah, casting the fb address to uint32_t is formally wrong
         * but as far as I know there are no PM2 with 64bit BARs
         */
        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;

        pm2_setup_i2c(sc);

        vcons_init(&sc->vd, sc, &sc->sc_defaultscreen_descr,
            &pm2fb_accessops);
        sc->vd.init_screen = pm2fb_init_screen;
        sc->vd.show_screen_cookie = &sc->sc_gc;
        sc->vd.show_screen_cb = glyphcache_adapt;

        /* init engine here */
        pm2fb_init(sc);

        ri = &sc->sc_console_screen.scr_ri;

        sc->sc_gc.gc_bitblt = pm2fb_bitblt;
        sc->sc_gc.gc_rectfill = pm2fb_rectfill_a;
        sc->sc_gc.gc_blitcookie = sc;
        sc->sc_gc.gc_rop = 3;

#ifdef PM2FB_DEBUG
        /*
         * leave some room at the bottom of the screen for various blitter
         * tests and in order to make the glyph cache visible
         */
        sc->sc_height -= 200;
#endif

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

                pm2fb_rectfill(sc, 0, 0, sc->sc_width, sc->sc_height,
                    ri->ri_devcmap[(defattr >> 16) & 0xff]);
                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);
                wsdisplay_cnattach(&sc->sc_defaultscreen_descr, ri, 0, 0,
                    defattr);
                vcons_replay_msgbuf(&sc->sc_console_screen);
        } else {
                if (sc->sc_console_screen.scr_ri.ri_rows == 0) {
                        /* do some minimal setup to avoid weirdnesses later */
                        vcons_init_screen(&sc->vd, &sc->sc_console_screen, 1, 
                           &defattr);
                } else
                        (*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);
                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);
        }

        pm2fb_init_palette(sc);
        
        aa.console = is_console;
        aa.scrdata = &sc->sc_screenlist;
        aa.accessops = &pm2fb_accessops;
        aa.accesscookie = &sc->vd;

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

#ifdef PM2FB_DEBUG
        /*
         * draw a pattern to check if pm2fb_bitblt() gets the alignment stuff
         * right
         */
        pm2fb_rectfill(sc, 0, sc->sc_height, sc->sc_width, 200, 0xffffffff);
        pm2fb_rectfill(sc, 0, sc->sc_height, 300, 10, 0);
        pm2fb_rectfill(sc, 10, sc->sc_height, 200, 10, 0xe0e0e0e0);
        for (i = 1; i < 20; i++) {
                pm2fb_bitblt(sc, 0, sc->sc_height, 
                        i, sc->sc_height + 10 * i,
                        300, 10, 3);
                pm2fb_bitblt(sc, i, sc->sc_height, 
                        400, sc->sc_height + 10 * i,
                        300, 10, 3);
        }
#endif
}

static int
pm2fb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
        struct lwp *l)
{
        struct vcons_data *vd = v;
        struct pm2fb_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 pm2fb_getcmap(sc,
                    (struct wsdisplay_cmap *)data);

        case WSDISPLAYIO_PUTCMAP:
                return pm2fb_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) {
                                        pm2fb_set_mode(sc, sc->sc_videomode);
                                }
                                /* then initialize the drawing engine */
                                pm2fb_init(sc);
                                pm2fb_init_palette(sc);
                                /* clean out the glyph cache */
                                glyphcache_wipe(&sc->sc_gc);
                                /* and redraw everything */
                                vcons_redraw_screen(ms);
                        } else
                                pm2fb_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
pm2fb_mmap(void *v, void *vs, off_t offset, int prot)
{
        struct vcons_data *vd = v;
        struct pm2fb_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);
                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);
                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;
        }
        /* XXX 2nd fb BAR? */

#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
pm2fb_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
        struct pm2fb_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;
        if (sc->sc_depth == 8)
                ri->ri_flg |= RI_8BIT_IS_RGB | RI_ENABLE_ALPHA;

        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 = pm2fb_copyrows;
        ri->ri_ops.copycols = pm2fb_copycols;
        ri->ri_ops.cursor = pm2fb_cursor;
        ri->ri_ops.eraserows = pm2fb_eraserows;
        ri->ri_ops.erasecols = pm2fb_erasecols;
        if (FONT_IS_ALPHA(ri->ri_font)) {
                ri->ri_ops.putchar = pm2fb_putchar_aa;
        } else
                ri->ri_ops.putchar = pm2fb_putchar;
}

static int
pm2fb_putcmap(struct pm2fb_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];

#ifdef PM2FB_DEBUG
        aprint_debug("putcmap: %d %d\n",index, count);
#endif
        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++) {
                pm2fb_putpalreg(sc, index, *r, *g, *b);
                index++;
                r++, g++, b++;
        }
        return 0;
}

static int
pm2fb_getcmap(struct pm2fb_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
pm2fb_init_palette(struct pm2fb_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];
                pm2fb_putpalreg(sc, i, cmap[j], cmap[j + 1], cmap[j + 2]);
                j += 3;
        }
}

static int
pm2fb_putpalreg(struct pm2fb_softc *sc, uint8_t idx, uint8_t r, uint8_t g,
    uint8_t b)
{
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_PAL_WRITE_IDX, idx);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_DATA, r);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_DATA, g);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_DATA, b);
        return 0;
}

static uint8_t
pm2fb_read_dac(struct pm2fb_softc *sc, int reg)
{
        if (sc->sc_is_pm2) {
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2_DAC_PAL_WRITE_IDX, reg);
                return bus_space_read_1(sc->sc_memt, sc->sc_regh,
                    PM2_DAC_INDEX_DATA);
        } else {
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2V_DAC_INDEX_LOW, reg & 0xff);
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2V_DAC_INDEX_HIGH, (reg >> 8) & 0xff);
                return bus_space_read_1(sc->sc_memt, sc->sc_regh,
                    PM2V_DAC_INDEX_DATA);
        }       
}

static void
pm2fb_write_dac(struct pm2fb_softc *sc, int reg, uint8_t data)
{
        pm2fb_wait(sc, 3);
        if (sc->sc_is_pm2) {
                pm2fb_wait(sc, 2);
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2_DAC_PAL_WRITE_IDX, reg);
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2_DAC_INDEX_DATA, data);
        } else {
                pm2fb_wait(sc, 3);
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2V_DAC_INDEX_LOW, reg & 0xff);
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2V_DAC_INDEX_HIGH, (reg >> 8) & 0xff);
                bus_space_write_1(sc->sc_memt, sc->sc_regh,
                    PM2V_DAC_INDEX_DATA, data);
        }       
}

static void
pm2fb_init(struct pm2fb_softc *sc)
{
        pm2fb_flush_engine(sc);

        pm2fb_wait(sc, 9);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_SCREEN_BASE, 0);
        /* set aperture endianness */
#if BYTE_ORDER == BIG_ENDIAN
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_APERTURE1_CONTROL,
                PM2_AP_BYTESWAP | PM2_AP_HALFWORDSWAP); 
#else
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_APERTURE1_CONTROL, 0);
#endif  
#if 0
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_BYPASS_MASK, 
                0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_FB_WRITE_MASK, 
                0xffffffff);
#endif
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HW_WRITEMASK, 
                0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_SW_WRITEMASK, 
                0xffffffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_WRITE_MODE, 
                PM2WM_WRITE_EN);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SCREENSIZE,
            (sc->sc_height << 16) | sc->sc_width);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SCISSOR_MODE, 
            PM2SC_SCREEN_EN);
        pm2fb_wait(sc, 8);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DITHER_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_ALPHA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DDA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_TEX_COLOUR_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_TEX_ADDRESS_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_TEX_READ_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_TEX_LUT_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_YUV_MODE, 0);
        pm2fb_wait(sc, 8);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DEPTH_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DEPTH, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_STENCIL_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_STIPPLE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_ROP_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_WINDOW_ORIGIN, 0);
#if 0
        sc->sc_pprod = bus_space_read_4(sc->sc_memt, sc->sc_regh, 
            PM2_FB_READMODE) &
            (PM2FB_PP0_MASK | PM2FB_PP1_MASK | PM2FB_PP2_MASK);
#endif
        sc->sc_pprod = partprodPermedia[sc->sc_stride >> 5];

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_FB_READMODE, 
            sc->sc_pprod);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_TEXMAP_FORMAT, 
            sc->sc_pprod);
        pm2fb_wait(sc, 9);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DY, 1 << 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DXDOM, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_STARTXDOM, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_STARTXSUB, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_STARTY, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_COUNT, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SCISSOR_MINYX, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SCISSOR_MAXYX,
            0x0fff0fff);
        /*
         * another scissor we need to disable in order to blit into off-screen
         * memory
         */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SCREENSIZE,
            0x0fff0fff);

        switch(sc->sc_depth) {
                case 8:
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_PIXEL_SIZE, PM2PS_8BIT);
                        break;
                case 16:
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_PIXEL_SIZE, PM2PS_16BIT);
                        break;
                case 32:
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_PIXEL_SIZE, PM2PS_32BIT);
                        break;
        }
        pm2fb_flush_engine(sc);
        DPRINTF("pixel size: %08x\n", 
            bus_space_read_4(sc->sc_memt, sc->sc_regh, PM2_RE_PIXEL_SIZE));
}

static void
pm2fb_rectfill(struct pm2fb_softc *sc, int x, int y, int wi, int he,
     uint32_t colour)
{

        pm2fb_wait(sc, 9);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DDA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_ALPHA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DITHER_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_CONFIG,
            PM2RECFG_WRITE_EN);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_BLOCK_COLOUR,
            colour);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_RECT_START,
            (y << 16) | x);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_RECT_SIZE,
            (he << 16) | wi);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_RENDER,
            PM2RE_RECTANGLE | PM2RE_INC_X | PM2RE_INC_Y | PM2RE_FASTFILL);
}

static void
pm2fb_rectfill_a(void *cookie, int x, int y, int wi, int he, long attr)
{
        struct pm2fb_softc *sc = cookie;

        pm2fb_rectfill(sc, x, y, wi, he,
            sc->vd.active->scr_ri.ri_devcmap[(attr >> 24 & 0xf)]);
}

static void
pm2fb_bitblt(void *cookie, int xs, int ys, int xd, int yd,
    int wi, int he, int rop)
{
        struct pm2fb_softc *sc = cookie;
        uint32_t dir = 0;
        int rxd, rwi, rxdelta;

        if (yd <= ys) {
                dir |= PM2RE_INC_Y;
        }
        if (xd <= xs) {
                dir |= PM2RE_INC_X;
        }
        pm2fb_wait(sc, 10);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DDA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_ALPHA_MODE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DITHER_MODE, 0);
        if (sc->sc_depth == 8) {
                int adjust;
                /*
                 * use packed mode for some extra speed
                 * this copies 32bit quantities even in 8 bit mode, so we need
                 * to adjust for cases where the lower two bits in source and
                 * destination X don't align, and/or where the width isn't a
                 * multiple of 4
                 */
                if (rop == 3) {
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_CONFIG,
                            PM2RECFG_READ_SRC | PM2RECFG_WRITE_EN |
                            PM2RECFG_ROP_EN | PM2RECFG_PACKED | (rop << 6));
                } else {
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_CONFIG,
                            PM2RECFG_READ_SRC | PM2RECFG_READ_DST |
                            PM2RECFG_WRITE_EN | PM2RECFG_PACKED |
                            PM2RECFG_ROP_EN | (rop << 6));
                }
                rxd = xd >> 2;
                rwi = (wi + 7) >> 2;
                rxdelta = (xs & 0xffc) - (xd & 0xffc);
                /* adjust for non-aligned x */
#ifdef BITBLT_LE_WORKAROUND
                /* I have no idea why this seems to work */
                adjust = 1;
#else
                adjust = ((xd & 3) - (xs & 3));
#endif
                bus_space_write_4(sc->sc_memt, sc->sc_regh,
                    PM2_RE_PACKEDDATA_LIMIT,
                    (xd << 16) | (xd + wi) | (adjust << 29));
                
        } else {
                /* we're in 16 or 32bit mode */
                if (rop == 3) {
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_CONFIG,
                            PM2RECFG_READ_SRC | PM2RECFG_WRITE_EN |
                            PM2RECFG_ROP_EN | PM2RECFG_PACKED | (rop << 6));
                } else {
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_CONFIG,
                            PM2RECFG_READ_SRC | PM2RECFG_READ_DST |
                            PM2RECFG_WRITE_EN | PM2RECFG_PACKED |
                            PM2RECFG_ROP_EN | (rop << 6));
                }
                rxd = xd;
                rwi = wi;
                rxdelta = xs - xd;
        }               
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_RECT_START,
            (yd << 16) | rxd);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_RECT_SIZE,
            (he << 16) | rwi);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_SOURCE_DELTA,
            (((ys - yd) & 0xfff) << 16) | (rxdelta & 0xfff));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_RENDER,
            PM2RE_RECTANGLE | dir);
}

static void
pm2fb_cursor(void *cookie, int on, int row, int col)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm2fb_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) {
                        pm2fb_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;
                        pm2fb_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
pm2fb_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 pm2fb_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) {
                        pm2fb_rectfill(sc, x, y, wi, he, bg);
                } else {
                        uc = c - font->firstchar;
                        data = (uint8_t *)font->data + uc * ri->ri_fontscale;

                        mode = PM2RM_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
                        pm2fb_wait(sc, 8);

                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_MODE, mode);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_CONFIG, PM2RECFG_WRITE_EN);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_BLOCK_COLOUR, bg);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RECT_START, (y << 16) | x);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RECT_SIZE, (he << 16) | wi);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RENDER,
                            PM2RE_RECTANGLE |
                            PM2RE_INC_X | PM2RE_INC_Y | PM2RE_FASTFILL);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_BLOCK_COLOUR, fg);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RENDER,
                            PM2RE_RECTANGLE | PM2RE_SYNC_ON_MASK |
                            PM2RE_INC_X | PM2RE_INC_Y | PM2RE_FASTFILL);

                        pm2fb_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,
                                            PM2_RE_BITMASK, 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,
                                            PM2_RE_BITMASK, reg);
                                        data16++;
                                }
                                break;
                        }
                        }
                }
                if (attr & WSATTR_UNDERLINE)
                        pm2fb_rectfill(sc, x, y + he - 2, wi, 1, fg);
        }
}

static void
pm2fb_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 pm2fb_softc *sc = scr->scr_cookie;
        uint32_t bg, fg, pixel, /*bg32,*/ fg32, aval;
        int i, x, y, wi, he;
        int r1, g1, b1, /*r0, g0, b0,*/ fgo/*, bgo*/;
        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];
        fg = ri->ri_devcmap[(attr >> 24) & 0xf];
        x = ri->ri_xorigin + col * wi;
        y = ri->ri_yorigin + row * he;

        /* always blit the cell with the background colour */
        pm2fb_rectfill(sc, x, y, wi, he, bg);

        /* if we draw a whitespace we're done here */
        if (c == 0x20) {
                if (attr & WSATTR_UNDERLINE)
                        pm2fb_rectfill(sc, x, y + he - 2, wi, 1, fg);
                return;
        }

#ifdef BITBLT_LE_WORKAROUND
        rv = GC_NOPE;
#else
        rv = glyphcache_try(&sc->sc_gc, c, x, y, attr);
        if (rv == GC_OK)
                return;
#endif

        data8 = WSFONT_GLYPH(c, font);

        pm2fb_wait(sc, 7);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_MODE, 0);
        /*
         * XXX
         * we *should* be able to get away without reading the framebuffer
         * since our background colour is always constant, but for some reason
         * that produces random, mostly black background
         */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_CONFIG,
                            PM2RECFG_WRITE_EN | PM2RECFG_READ_DST);

        /* enable alpha blending and R3G3B2 output */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_ALPHA_MODE,
                            PM2AL_ENABLE |
                            PM2AL_OP_SRC_IS_SRC_ALPHA | 
                            PM2AL_OP_DST_IS_ONE_MINUS_SRC_ALPHA |
                            PM2AL_332F | PM2AL_RGB);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_RE_DITHER_MODE,
                            PM2DM_ENABLE |
                            PM2DM_332F | PM2DM_RGB);

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

        r1 = rasops_cmap[fgo];
        g1 = rasops_cmap[fgo + 1];
        b1 = rasops_cmap[fgo + 2];

        fg32 = ( r1 << 16) | (g1 << 8) | b1;

        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RECT_START, (y << 16) | x);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RECT_SIZE, (he << 16) | wi);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            PM2_RE_RENDER,
                            PM2RE_RECTANGLE | PM2RE_SYNC_ON_HOST |
                            PM2RE_INC_X | PM2RE_INC_Y);

        pm2fb_wait(sc, 50);

        /*
         * and now we just hammer the foreground colour and alpha values into
         * the upload port
         */
        for (i = 0; i < ri->ri_fontscale; i++) {
                aval = *data8;
                pixel = fg32 | (aval << 24);
                cnt++;
                bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            PM2_RE_COLOUR, pixel);

                if (cnt > 48) {
                        pm2fb_wait(sc, 50);
                        cnt = 0;
                }               
                data8++;
        }

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

        if (attr & WSATTR_UNDERLINE)
                pm2fb_rectfill(sc, x, y + he - 2, wi, 1, fg);
}

static void
pm2fb_copycols(void *cookie, int row, int srccol, int dstcol, int ncols)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm2fb_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;
                pm2fb_bitblt(sc, xs, y, xd, y, width, height, 3);
        }
}

static void
pm2fb_erasecols(void *cookie, int row, int startcol, int ncols, long fillattr)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm2fb_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);

                pm2fb_rectfill(sc, x, y, width, height, ri->ri_devcmap[bg]);
        }
}

static void
pm2fb_copyrows(void *cookie, int srcrow, int dstrow, int nrows)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm2fb_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;
                pm2fb_bitblt(sc, x, ys, x, yd, width, height, 3);
        }
}

static void
pm2fb_eraserows(void *cookie, int row, int nrows, long fillattr)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct pm2fb_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;
                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);

                pm2fb_rectfill(sc, x, y, width, height, ri->ri_devcmap[bg]);
        }
}

/*
 * Permedia2 can't blit outside of 2048x2048, so reject anything higher
 * max. dot clock is probably too high
 */

#define MODE_IS_VALID(m) (((m)->hdisplay < 2048) && \
        ((m)->dot_clock < 230000))

static void
pm2_setup_i2c(struct pm2fb_softc *sc)
{
        int i, ok;
#ifdef PM2FB_DEBUG
        int j;
#endif

        /* Fill in the i2c tag */
        iic_tag_init(&sc->sc_i2c);
        sc->sc_i2c.ic_cookie = sc;
        sc->sc_i2c.ic_send_start = pm2fb_i2c_send_start;
        sc->sc_i2c.ic_send_stop = pm2fb_i2c_send_stop;
        sc->sc_i2c.ic_initiate_xfer = pm2fb_i2c_initiate_xfer;
        sc->sc_i2c.ic_read_byte = pm2fb_i2c_read_byte;
        sc->sc_i2c.ic_write_byte = pm2fb_i2c_write_byte;

        DPRINTF("data: %08x\n", bus_space_read_4(sc->sc_memt, sc->sc_regh,
                PM2_DISPLAY_DATA));

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_DISPLAY_DATA, 0);

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

        /* Some monitors don't respond first time */
        i = 0;
        ok = 0;
        while (!ok && i < 10) {
                ddc_read_edid(&sc->sc_i2c, sc->sc_edid_data, 128);
                ok = (edid_parse(&sc->sc_edid_data[0], &sc->sc_ei) != -1);
                i++;
        }
#ifdef PM2FB_DEBUG
        printf("i = %d\n", i);
        for (i = 0; i < 128; i += 16) {
                printf("%02x:", i);
                for (j = 0; j < 16; j++)
                        printf(" %02x", sc->sc_edid_data[i + j]);
                printf("\n");
        }
#endif

        if (ok) {
#ifdef PM2FB_DEBUG
                edid_print(&sc->sc_ei);
#endif

                /*
                 * Now pick a mode.
                 */
                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) {
                pm2fb_set_mode(sc, sc->sc_videomode);
        }
}

/* I2C bitbanging */
static void pm2fb_i2cbb_set_bits(void *cookie, uint32_t bits)
{
        struct pm2fb_softc *sc = cookie;
        uint32_t out;

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

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_DISPLAY_DATA, out);
        delay(100);
}

static void pm2fb_i2cbb_set_dir(void *cookie, uint32_t dir)
{
        /* Nothing to do */
}

static uint32_t pm2fb_i2cbb_read(void *cookie)
{
        struct pm2fb_softc *sc = cookie;
        uint32_t bits;

        bits = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM2_DISPLAY_DATA);
        return bits;
}

/* higher level I2C stuff */
static int
pm2fb_i2c_send_start(void *cookie, int flags)
{
        return (i2c_bitbang_send_start(cookie, flags, &pm2fb_i2cbb_ops));
}

static int
pm2fb_i2c_send_stop(void *cookie, int flags)
{

        return (i2c_bitbang_send_stop(cookie, flags, &pm2fb_i2cbb_ops));
}

static int
pm2fb_i2c_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
{

        return (i2c_bitbang_initiate_xfer(cookie, addr, flags, 
            &pm2fb_i2cbb_ops));
}

static int
pm2fb_i2c_read_byte(void *cookie, uint8_t *valp, int flags)
{
        return (i2c_bitbang_read_byte(cookie, valp, flags, &pm2fb_i2cbb_ops));
}

static int
pm2fb_i2c_write_byte(void *cookie, uint8_t val, int flags)
{
        return (i2c_bitbang_write_byte(cookie, val, flags, &pm2fb_i2cbb_ops));
}

static int
pm2vfb_set_pll(struct pm2fb_softc *sc, int freq)
{
        int m, n, p, diff, out_freq, bm = 1, bn = 3, bp = 0,
            bdiff = 1000000 /* , bfreq */;
        int fi;
        uint8_t temp;

        for (m = 1; m < 128; m++) {
                for (n = 2 * m + 1; n < 256; n++) {
                        fi = PM2_EXT_CLOCK_FREQ * n / m;
                        for (p = 0; p < 2; p++) {
                                out_freq = fi >> (p + 1);
                                diff = abs(out_freq - freq);
                                if (diff < bdiff) {
                                        bdiff = diff;
                                        /* bfreq = out_freq; */
                                        bm = m;
                                        bn = n;
                                        bp = p;
                                }
                        }
                }
        }
#if 0
        /*
         * XXX
         * output between switching modes and attaching a wsdisplay will
         * go through firmware calls on sparc64 and potentially mess up
         * our drawing engine state
         */
        DPRINTF("best: %d kHz ( %d off ), %d %d %d\n", bfreq, bdiff, bm, bn, bp);
#endif
        temp = pm2fb_read_dac(sc, PM2V_DAC_CLOCK_CONTROL) & 0xfc;
        pm2fb_write_dac(sc, PM2V_DAC_CONTROL, 0);
        pm2fb_write_dac(sc, PM2V_DAC_CLOCK_A_M, bm);
        pm2fb_write_dac(sc, PM2V_DAC_CLOCK_A_N, bn);
        pm2fb_write_dac(sc, PM2V_DAC_CLOCK_A_P, bp);
        pm2fb_write_dac(sc, PM2V_DAC_CLOCK_CONTROL, temp | 3);
        return 0;
}

static int
pm2fb_set_pll(struct pm2fb_softc *sc, int freq)
{
        uint8_t  reg, bm = 0, bn = 0, bp = 0;
        unsigned int  m, n, p, fi, diff, out_freq, bdiff = 1000000;

        for (n = 2; n < 15; n++) {
                for (m = 2 ; m < 256; m++) {
                        fi = PM2_EXT_CLOCK_FREQ * m / n;
                        if (fi >= PM2_PLL_FREQ_MIN && fi <= PM2_PLL_FREQ_MAX) {
                                for (p = 0; p < 5; p++) {
                                        out_freq = fi >> p;
                                        diff = abs(out_freq - freq);
                                        if (diff < bdiff) {
                                                bm = m;
                                                bn = n;
                                                bp = p;
                                                bdiff = diff;
                                        }
                                }
                        }
                }
        }

        pm2fb_write_dac(sc, PM2_DAC_PIXELCLKA_M, bm);
        pm2fb_write_dac(sc, PM2_DAC_PIXELCLKA_N, bn);
        pm2fb_write_dac(sc, PM2_DAC_PIXELCLKA_P, (bp | 0x08));

        do {
                reg = bus_space_read_1(sc->sc_memt, sc->sc_regh,
                        PM2_DAC_INDEX_DATA);
        } while (reg == PCLK_LOCKED);

        return 0;
}

/*
 * most of the following was adapted from the xf86-video-glint driver's
 * pm2_dac.c (8bpp only)
 */
static void 
pm2fb_set_dac(struct pm2fb_softc *sc, const struct videomode *mode)
{
        int t1, t2, t3, t4, stride;
        uint32_t vclk, tmp;
        uint8_t sync = 0;
        
        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;

        /* first round up to the next multiple of 32 */
        stride = (mode->hdisplay + 31) & ~31;
        /* then find the next bigger one that we have partial products for */
        while ((partprodPermedia[stride >> 5] == -1) && (stride < 2048)) {
                stride += 32;
        }

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HTOTAL, 
            ((mode->htotal) >> 2) - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HSYNC_END,
            (t1 + t3) >> 2);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HSYNC_START,
            (t1 >> 2));
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HBLANK_END,
            (mode->htotal - mode->hdisplay) >> 2);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HGATE_END,
            (mode->htotal - mode->hdisplay) >> 2);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_SCREEN_STRIDE,  
            stride >> 3);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VTOTAL, 
            mode->vtotal - 2);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VSYNC_END,
            t2 + t4 - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VSYNC_START,
            t2 - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VBLANK_END,
            mode->vtotal - mode->vdisplay);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VIDEO_CONTROL,
            PM2_VC_VIDEO_ENABLE | 
            PM2_VC_HSYNC_ACT_HIGH | PM2_VC_VSYNC_ACT_HIGH);

        vclk = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM2_VCLKCTL);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VCLKCTL,
            vclk & 0xfffffffc);

        tmp = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM2_CHIP_CONFIG);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_CHIP_CONFIG,
            tmp & 0xffffffdd);

        pm2fb_write_dac(sc, PM2_DAC_MODE_CONTROL, MOC_BUFFERFRONT);
        pm2fb_set_pll(sc, mode->dot_clock);     

        sync = MC_PALETTE_8BIT;

        if (!(mode->flags & VID_PHSYNC))
            sync |= MC_HSYNC_INV;
        if (!(mode->flags & VID_PVSYNC))
            sync |= MC_VSYNC_INV;

        pm2fb_write_dac(sc, PM2_DAC_MISC_CONTROL, sync);
        pm2fb_write_dac(sc, PM2_DAC_COLOR_MODE,
            CM_PALETTE | CM_GUI_ENABLE | CM_RGB);

        sc->sc_width = mode->hdisplay;
        sc->sc_height = mode->vdisplay;
        sc->sc_depth = 8;
        sc->sc_stride = stride;
        aprint_normal_dev(sc->sc_dev, "pm2 using %d x %d in 8 bit, stride %d\n",
            sc->sc_width, sc->sc_height, stride);
}

/*
 * most of the following was adapted from the xf86-video-glint driver's
 * pm2v_dac.c
 */                             
static void
pm2vfb_set_dac(struct pm2fb_softc *sc, const struct videomode *mode)
{
        int t1, t2, t3, t4, stride;
        uint32_t vclk;
        uint8_t sync = 0;
        
        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;

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HTOTAL,
            ((mode->htotal) >> 3) - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HSYNC_END,
            (t1 + t3) >> 3);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HSYNC_START,
            (t1 >> 3) - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HBLANK_END,
            (mode->htotal - mode->hdisplay) >> 3);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_HGATE_END,
            (mode->htotal - mode->hdisplay) >> 3);

        /* first round up to the next multiple of 32 */
        stride = (mode->hdisplay + 31) & ~31;
        /* then find the next bigger one that we have partial products for */
        while ((partprodPermedia[stride >> 5] == -1) && (stride < 2048)) {
                stride += 32;
        }
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_SCREEN_STRIDE,
            stride >> 3);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VTOTAL,
            mode->vtotal - 1);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VSYNC_END,
            t2 + t4);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VSYNC_START,
            t2);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VBLANK_END,
            mode->vtotal - mode->vdisplay);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VIDEO_CONTROL,
            PM2_VC_VIDEO_ENABLE | PM2_VC_RAMDAC_64BIT |
            PM2_VC_HSYNC_ACT_HIGH | PM2_VC_VSYNC_ACT_HIGH);

        vclk = bus_space_read_4(sc->sc_memt, sc->sc_regh, PM2_VCLKCTL);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, PM2_VCLKCTL,
            vclk & 0xfffffffc);

        pm2vfb_set_pll(sc, mode->dot_clock / 2);
        pm2fb_write_dac(sc, PM2V_DAC_MISC_CONTROL, PM2V_DAC_8BIT);

        if (mode->flags & VID_PHSYNC)
                sync |= PM2V_DAC_HSYNC_INV;
        if (mode->flags & VID_PVSYNC)
                sync |= PM2V_DAC_VSYNC_INV;
        pm2fb_write_dac(sc, PM2V_DAC_SYNC_CONTROL, sync);
        
        pm2fb_write_dac(sc, PM2V_DAC_COLOR_FORMAT, PM2V_DAC_PALETTE);
        pm2fb_write_dac(sc, PM2V_DAC_PIXEL_SIZE, PM2V_PS_8BIT);
        sc->sc_width = mode->hdisplay;
        sc->sc_height = mode->vdisplay;
        sc->sc_depth = 8;
        sc->sc_stride = stride;
        aprint_normal_dev(sc->sc_dev, "pm2v using %d x %d in 8 bit, stride %d\n",
            sc->sc_width, sc->sc_height, stride);
}

static void
pm2fb_set_mode(struct pm2fb_softc *sc, const struct videomode *mode)
{
        if (sc->sc_is_pm2) {
                pm2fb_set_dac(sc, mode);
        } else {
                pm2vfb_set_dac(sc, mode);
        }      
}