/*      $NetBSD: voyagerfb.c,v 1.36 2026/06/18 22:10:27 rkujawa Exp $   */

/*
 * Copyright (c) 2009, 2011 Michael Lorenz
 * 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 Silicon Motion SM502 / Voyager GX  graphics controllers
 * tested on GDIUM only so far
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: voyagerfb.c,v 1.36 2026/06/18 22:10:27 rkujawa 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 <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/ic/sm502reg.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/pci/wsdisplay_pci.h>

#include "opt_voyagerfb.h"

#include <dev/i2c/i2cvar.h>
#ifdef VOYAGERFB_MODE_SETTING
#include <dev/i2c/ddcvar.h>
#include <dev/videomode/edidvar.h>
#endif
#include <dev/pci/voyagervar.h>
#include <dev/wscons/wsdisplay_glyphcachevar.h>

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

/* XXX these are gdium-specific */
#define GPIO_BACKLIGHT  0x20000000

struct voyagerfb_softc {
        device_t sc_dev;

        pci_chipset_tag_t sc_pc;
        pcitag_t sc_pcitag;
        bus_space_tag_t sc_memt;

        bus_space_handle_t sc_fbh;
        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;
        void *sc_fbaddr;
        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;
        uint8_t *sc_dataport;
        int sc_mode;
        int sc_bl_on, sc_bl_level;
        void *sc_gpio_cookie;

#ifdef VOYAGERFB_MODE_SETTING
        /* DDC/EDID via the SM502 hardware I2C master (independent of parent) */
        struct i2c_controller sc_ddc_i2c;
        uint8_t sc_edid[128];
        uint8_t sc_i2c_status;          /* last engine status, for diag */
        bool sc_edid_valid;
        struct edid_info sc_edid_info;
#endif

        /* cursor stuff */
        int sc_cur_x;
        int sc_cur_y;
        int sc_hot_x;
        int sc_hot_y;
        uint32_t sc_cursor_addr;
        uint32_t *sc_cursor;
 
        /* colour map */
        u_char sc_cmap_red[256];
        u_char sc_cmap_green[256];
        u_char sc_cmap_blue[256];

        glyphcache sc_gc;
};

static int      voyagerfb_match(device_t, cfdata_t, void *);
static void     voyagerfb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(voyagerfb, sizeof(struct voyagerfb_softc),
    voyagerfb_match, voyagerfb_attach, NULL, NULL);

extern const u_char rasops_cmap[768];

static int      voyagerfb_ioctl(void *, void *, u_long, void *, int,
                             struct lwp *);
static paddr_t  voyagerfb_mmap(void *, void *, off_t, int);
static void     voyagerfb_init_screen(void *, struct vcons_screen *, int,
                 long *);

static int      voyagerfb_putcmap(struct voyagerfb_softc *,
                 struct wsdisplay_cmap *);
static int      voyagerfb_getcmap(struct voyagerfb_softc *,
                 struct wsdisplay_cmap *);
static void     voyagerfb_restore_palette(struct voyagerfb_softc *);
static int      voyagerfb_putpalreg(struct voyagerfb_softc *, int, uint8_t,
                            uint8_t, uint8_t);

static void     voyagerfb_init(struct voyagerfb_softc *);

#ifdef VOYAGERFB_MODE_SETTING
/* DDC/EDID over the SM502 hardware I2C master */
static void     voyagerfb_i2c_enable(struct voyagerfb_softc *);
static int      voyagerfb_i2c_xfer(struct voyagerfb_softc *, int, i2c_addr_t,
                            uint8_t *, size_t);
static int      voyagerfb_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *,
                            size_t, void *, size_t, int);
static void     voyagerfb_ddc_read(struct voyagerfb_softc *);

/* mode-setting */
static void     voyagerfb_set_videomode(struct voyagerfb_softc *,
                            const struct videomode *);
static bus_size_t voyagerfb_active_clock_reg(struct voyagerfb_softc *);
static void     voyagerfb_solve_pll(int, uint32_t *, uint32_t *, uint32_t *);
static void     voyagerfb_set_dotclock(struct voyagerfb_softc *, int);
static void     voyagerfb_set_geometry(struct voyagerfb_softc *,
                            const struct videomode *);
static void     voyagerfb_set_mode(struct voyagerfb_softc *,
                            const struct videomode *);
static bool     voyagerfb_mode_ok(struct voyagerfb_softc *,
                            const struct videomode *);
static const struct videomode *voyagerfb_pick_mode(struct voyagerfb_softc *);
#endif

static void     voyagerfb_rectfill(struct voyagerfb_softc *, int, int, int, int,
                            uint32_t);
static void     voyagerfb_bitblt(void *, int, int, int, int,
                            int, int, int);

static void     voyagerfb_cursor(void *, int, int, int);
static void     voyagerfb_putchar_mono(void *, int, int, u_int, long);
static void     voyagerfb_putchar_aa32(void *, int, int, u_int, long);
static void     voyagerfb_putchar_aa8(void *, int, int, u_int, long);
static void     voyagerfb_copycols(void *, int, int, int, int);
static void     voyagerfb_erasecols(void *, int, int, int, long);
static void     voyagerfb_copyrows(void *, int, int, int);
static void     voyagerfb_eraserows(void *, int, int, long);

static int      voyagerfb_set_curpos(struct voyagerfb_softc *, int, int);
static int      voyagerfb_gcursor(struct voyagerfb_softc *,
                 struct wsdisplay_cursor *);
static int      voyagerfb_scursor(struct voyagerfb_softc *,
                 struct wsdisplay_cursor *);

struct wsdisplay_accessops voyagerfb_accessops = {
        voyagerfb_ioctl,
        voyagerfb_mmap,
        NULL,   /* alloc_screen */
        NULL,   /* free_screen */
        NULL,   /* show_screen */
        NULL,   /* load_font */
        NULL,   /* pollc */
        NULL    /* scroll */
};

static void     voyagerfb_setup_backlight(struct voyagerfb_softc *);
static void     voyagerfb_brightness_up(device_t);
static void     voyagerfb_brightness_down(device_t);
/* set backlight level */
static void     voyagerfb_set_backlight(struct voyagerfb_softc *, int);
/* turn backlight on and off without messing with the level */
static void     voyagerfb_switch_backlight(struct voyagerfb_softc *, int);

/* wait for FIFO empty so we can feed it another command */
static inline void
voyagerfb_ready(struct voyagerfb_softc *sc)
{
        do {} while ((bus_space_read_4(sc->sc_memt, sc->sc_regh, 
            SM502_SYSTEM_CTRL) & SM502_SYSCTL_FIFO_EMPTY) == 0);
}

/* wait for the drawing engine to be idle */
static inline void
voyagerfb_wait(struct voyagerfb_softc *sc)
{
        do {} while ((bus_space_read_4(sc->sc_memt, sc->sc_regh,
            SM502_SYSTEM_CTRL) & SM502_SYSCTL_ENGINE_BUSY) != 0);
}

#ifdef VOYAGERFB_MODE_SETTING
/* route GPIO46/47 to the I2C master and enable the engine */
static void
voyagerfb_i2c_enable(struct voyagerfb_softc *sc)
{
        uint32_t reg;

        /* make sure the GPIO/PWM/I2C block is clocked */
        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_CURRENT_GATE);
        if ((reg & SM502_GATE_GPIO_ENABLE) == 0) {
                reg |= SM502_GATE_GPIO_ENABLE;
                bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CURRENT_GATE,
                    reg);
        }

        /* select the I2C special function on GPIO46/47 (1 = not plain GPIO) */
        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO1_CONTROL);
        reg |= SM502_GPIO1_I2C_BITS;
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_GPIO1_CONTROL, reg);

        /* clear any latched error, then enable in standard (100kHz) mode */
        bus_space_write_1(sc->sc_memt, sc->sc_regh, SM502_I2C_RESET, 0);
        bus_space_write_1(sc->sc_memt, sc->sc_regh, SM502_I2C_CONTROL,
            SM502_I2C_CTL_ENABLE);
}

/*
 * Run one hardware I2C transaction of up to SM502_I2C_MAX_BYTES
 */
static int
voyagerfb_i2c_xfer(struct voyagerfb_softc *sc, int rw, i2c_addr_t addr,
    uint8_t *data, size_t len)
{
        uint8_t status = 0;
        size_t i;
        int timo;

        if (len == 0 || len > SM502_I2C_MAX_BYTES)
                return EINVAL;

        /*
         * Reset the engine 
         */
        bus_space_write_1(sc->sc_memt, sc->sc_regh, SM502_I2C_RESET, 0);
        delay(1);

        bus_space_write_1(sc->sc_memt, sc->sc_regh, SM502_I2C_SLAVE_ADDR,
            (uint8_t)(addr << 1) | (rw ? SM502_I2C_ADDR_READ : 0));

        if (rw == 0) {
                for (i = 0; i < len; i++)
                        bus_space_write_1(sc->sc_memt, sc->sc_regh,
                            SM502_I2C_DATA0 + i, data[i]);
        }

        bus_space_write_1(sc->sc_memt, sc->sc_regh, SM502_I2C_BYTE_COUNT,
            (uint8_t)(len - 1));

        /* keep ENABLE set, kick off the transfer (START self-clears) */
        bus_space_write_1(sc->sc_memt, sc->sc_regh, SM502_I2C_CONTROL,
            SM502_I2C_CTL_ENABLE | SM502_I2C_CTL_START);

        /* 16-byte tx at 100kHz, allow 10ms */
        for (timo = 10000; timo > 0; timo--) {
                status = bus_space_read_1(sc->sc_memt, sc->sc_regh,
                    SM502_I2C_STATUS);
                if (status & (SM502_I2C_STAT_COMPLETE | SM502_I2C_STAT_ERROR))
                        break;
                delay(1);
        }
        sc->sc_i2c_status = status;

        if (timo == 0 || (status & SM502_I2C_STAT_ERROR))
                return EIO;
        if (status & SM502_I2C_STAT_NAK)
                return ENXIO;

        if (rw != 0) {
                for (i = 0; i < len; i++)
                        data[i] = bus_space_read_1(sc->sc_memt, sc->sc_regh,
                            SM502_I2C_DATA0 + i);
        }

        return 0;
}

static int
voyagerfb_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
    const void *cmdbuf, size_t cmdlen, void *buf, size_t buflen, int flags)
{
        struct voyagerfb_softc *sc = cookie;
        uint8_t *p;
        size_t done, chunk;
        int rw, error;

        if (cmdlen > 0) {
                uint8_t tmp[SM502_I2C_MAX_BYTES];

                if (cmdlen > sizeof(tmp))
                        return EINVAL;
                memcpy(tmp, cmdbuf, cmdlen);
                error = voyagerfb_i2c_xfer(sc, 0, addr, tmp, cmdlen);
                if (error)
                        return error;
        }

        if (buflen == 0)
                return 0;

        rw = I2C_OP_READ_P(op) ? SM502_I2C_ADDR_READ : 0;
        p = buf;
        for (done = 0; done < buflen; done += chunk) {
                chunk = buflen - done;
                if (chunk > SM502_I2C_MAX_BYTES)
                        chunk = SM502_I2C_MAX_BYTES;
                error = voyagerfb_i2c_xfer(sc, rw, addr, p + done, chunk);
                if (error)
                        return error;
        }

        return 0;
}

/* read and parse the monitor's EDID over the hardware I2C master */
static void
voyagerfb_ddc_read(struct voyagerfb_softc *sc)
{
        int i;

        voyagerfb_i2c_enable(sc);

        iic_tag_init(&sc->sc_ddc_i2c);
        sc->sc_ddc_i2c.ic_cookie = sc;
        sc->sc_ddc_i2c.ic_exec = voyagerfb_i2c_exec;

        /* some displays miss the first attempt */
        memset(sc->sc_edid, 0, sizeof(sc->sc_edid));
        for (i = 0; i < 3; i++) {
                if (ddc_read_edid(&sc->sc_ddc_i2c, sc->sc_edid,
                    sizeof(sc->sc_edid)) == 0 && sc->sc_edid[1] != 0)
                        break;
                memset(sc->sc_edid, 0, sizeof(sc->sc_edid));
        }

        if (sc->sc_edid[1] == 0) {
                aprint_normal_dev(sc->sc_dev,
                    "DDC: no EDID response (I2C status 0x%02x)\n",
                    sc->sc_i2c_status);
                return;
        }

        if (edid_parse(sc->sc_edid, &sc->sc_edid_info) == -1) {
                aprint_error_dev(sc->sc_dev, "DDC: EDID parse failed\n");
                return;
        }

        sc->sc_edid_valid = true;
}

/*
 * Program the panel timing generator from a videomode.
 */
static void
voyagerfb_set_videomode(struct voyagerfb_softc *sc, const struct videomode *vm)
{
        uint32_t ht, hs, vt, vs, ctrl;

        ht = ((uint32_t)(vm->htotal - 1) << SM502_HT_HTOTAL_SHIFT) |
            (vm->hdisplay - 1);
        hs = ((uint32_t)(vm->hsync_end - vm->hsync_start) <<
            SM502_HS_HSWIDTH_SHIFT) | (vm->hsync_start - 1);
        vt = ((uint32_t)(vm->vtotal - 1) << SM502_VT_VTOTAL_SHIFT) |
            (vm->vdisplay - 1);
        vs = ((uint32_t)(vm->vsync_end - vm->vsync_start) <<
            SM502_VS_VSHEIGHT_SHIFT) | (vm->vsync_start - 1);

        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_HTOTAL, ht);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_HSYNC, hs);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_VTOTAL, vt);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_VSYNC, vs);

        ctrl = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL);
        ctrl &= ~(SM502_PDC_HSYNC_PHASE_LOW | SM502_PDC_VSYNC_PHASE_LOW);
        if (vm->flags & VID_NHSYNC)
                ctrl |= SM502_PDC_HSYNC_PHASE_LOW;
        if (vm->flags & VID_NVSYNC)
                ctrl |= SM502_PDC_VSYNC_PHASE_LOW;
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL, ctrl);
}

/* return the clock register of the currently-selected power mode */
static bus_size_t
voyagerfb_active_clock_reg(struct voyagerfb_softc *sc)
{
        uint32_t ctrl = bus_space_read_4(sc->sc_memt, sc->sc_regh,
            SM502_POWER_MODE_CONTROL);

        return (ctrl & SM502_PMCTL_MODE_MASK) ? SM502_POWER_MODE1_CLOCK :
            SM502_POWER_MODE0_CLOCK;
}

/*
 * Find programmable-PLL M/N/K
 */
static void
voyagerfb_solve_pll(int target_khz, uint32_t *rm, uint32_t *rn, uint32_t *rk)
{
        uint32_t k, n, m, bm = 1, bn = 1, bk = 1;
        int actual, err, vco, vcodist;
        int best_err = 0x7fffffff, best_vcodist = 0x7fffffff;

        for (k = 1; k <= 2; k++) {
                for (n = 1; n <= 127; n++) {
                        m = ((uint32_t)target_khz * n * k + SM502_XTAL_KHZ / 2) /
                            SM502_XTAL_KHZ;
                        if (m < 1 || m > 255)
                                continue;
                        vco = (int)(SM502_XTAL_KHZ * m / n);    /* before /K */
                        if (vco < SM502_PLL_VCO_MIN || vco > SM502_PLL_VCO_MAX)
                                continue;
                        actual = vco / (int)k;
                        err = actual - target_khz;
                        if (err < 0)
                                err = -err;
                        vcodist = vco - SM502_PLL_VCO_NOM;
                        if (vcodist < 0)
                                vcodist = -vcodist;
                        if (err < best_err ||
                            (err == best_err && vcodist < best_vcodist)) {
                                best_err = err;
                                best_vcodist = vcodist;
                                bm = m;
                                bn = n;
                                bk = k;
                        }
                }
        }
        *rm = bm;
        *rn = bn;
        *rk = bk;
}

/*
 * Program the panel pixel clock via the PLL
 */
static void
voyagerfb_set_dotclock(struct voyagerfb_softc *sc, int dotclock_khz)
{
        bus_size_t clk = voyagerfb_active_clock_reg(sc);
        uint32_t m, n, k, pll, reg;

        voyagerfb_solve_pll(dotclock_khz * 2, &m, &n, &k);

        pll = SM502_PLL_POWER |
            ((n << SM502_PLL_N_SHIFT) & SM502_PLL_N_MASK) |
            ((m << SM502_PLL_M_SHIFT) & SM502_PLL_M_MASK);
        if (k == 2)
                pll |= SM502_PLL_K_DIV2;
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PROG_PLL, pll);
        delay(20000);                           /* >= 16 ms PLL lock */

        /* select the programmable PLL as P2XCLK source, then wait */
        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, clk);
        reg = (reg & ~SM502_PMC_P2_SRC_MASK) |
            (SM502_PMC_SRC_PROGPLL << SM502_PMC_P2_SRC_SHIFT);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, clk, reg);
        delay(20000);

        /* P2 divider = 1, 2x stage active (DIS2X clear) */
        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, clk);
        reg &= ~(SM502_PMC_P2_DIV_MASK | SM502_PMC_P2_DIS2X);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, clk, reg);
        delay(20000);
}

static const struct videomode *
voyagerfb_pick_mode(struct voyagerfb_softc *sc)
{
        const struct videomode *vm;

        if (!sc->sc_edid_valid)
                return NULL;

        vm = sc->sc_edid_info.edid_preferred_mode;
        if (vm != NULL && voyagerfb_mode_ok(sc, vm))
                return vm;
        return NULL;
}

/* program the panel framebuffer window/plane geometry for a mode */
static void
voyagerfb_set_geometry(struct voyagerfb_softc *sc, const struct videomode *vm)
{
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_FB_WIDTH,
            (uint32_t)vm->hdisplay << 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_FB_HEIGHT,
            (uint32_t)vm->vdisplay << 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_TL, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_BR,
            ((uint32_t)vm->vdisplay << 16) | (uint32_t)vm->hdisplay);
        /* the FB stride is programmed from sc_stride later, in voyagerfb_init */
}

static void
voyagerfb_set_mode(struct voyagerfb_softc *sc, const struct videomode *vm)
{
        uint32_t ctrl;

        ctrl = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL,
            ctrl & ~SM502_PDC_TIMING_ENABLE);

        voyagerfb_set_dotclock(sc, vm->dot_clock);
        voyagerfb_set_videomode(sc, vm);        /* timing + sync polarity */
        voyagerfb_set_geometry(sc, vm);

        ctrl = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL,
            ctrl | SM502_PDC_TIMING_ENABLE);
}

/*
 * Sanity-check a candidate mode
 */
static bool
voyagerfb_mode_ok(struct voyagerfb_softc *sc, const struct videomode *vm)
{
#ifdef VOYAGERFB_DEPTH_32
        const int bytespp = 4;
#else
        const int bytespp = 1;
#endif
        const struct edid_range *r = &sc->sc_edid_info.edid_range;
        int hfreq, vfreq;

        if (vm->hdisplay > 4095 || vm->htotal > 4095 ||
            vm->vdisplay > 2047 || vm->vtotal > 2047)
                return false;
        if ((uint32_t)vm->hdisplay * vm->vdisplay * bytespp > sc->sc_fbsize)
                return false;

        if (!sc->sc_edid_valid || !sc->sc_edid_info.edid_have_range)
                return false;

        hfreq = vm->dot_clock / vm->htotal;                     /* kHz */
        vfreq = (vm->dot_clock * 1000) / (vm->htotal * vm->vtotal); /* Hz */

        if (vm->dot_clock / 1000 > r->er_max_clock)
                return false;
        if (hfreq < r->er_min_hfreq || hfreq > r->er_max_hfreq)
                return false;
        if (vfreq < r->er_min_vfreq || vfreq > r->er_max_vfreq)
                return false;

        return true;
}

#endif /* VOYAGERFB_MODE_SETTING */

static int
voyagerfb_match(device_t parent, cfdata_t match, void *aux)
{
        struct voyager_attach_args *vaa = (struct voyager_attach_args *)aux;

        if (strcmp(vaa->vaa_name, "voyagerfb") == 0) return 100;
        return 0;
}

static void
voyagerfb_attach(device_t parent, device_t self, void *aux)
{
        struct voyagerfb_softc  *sc = device_private(self);
        struct voyager_attach_args      *vaa = aux;
        struct rasops_info      *ri;
        struct wsemuldisplaydev_attach_args aa;
        prop_dictionary_t       dict;
        unsigned long           defattr;
        uint32_t                reg;
        bool                    is_console = false;
        int i, j;
        uint8_t                 cmap[768];

        sc->sc_pc = vaa->vaa_pc;
        sc->sc_pcitag = vaa->vaa_pcitag;
        sc->sc_memt = vaa->vaa_tag;
        sc->sc_dev = self;

        aprint_normal("\n");

        dict = device_properties(self);
        prop_dictionary_get_bool(dict, "is_console", &is_console);

        sc->sc_fb = vaa->vaa_mem_pa;
        sc->sc_fbh = vaa->vaa_memh;
        sc->sc_fbaddr = bus_space_vaddr(sc->sc_memt, sc->sc_fbh);

        sc->sc_reg = vaa->vaa_reg_pa;
        sc->sc_regh = vaa->vaa_regh;
        sc->sc_regsize = 2 * 1024 * 1024;
        sc->sc_dataport = bus_space_vaddr(sc->sc_memt, sc->sc_regh);
        sc->sc_dataport += SM502_DATAPORT;

        sc->sc_gpio_cookie = device_private(parent);

#ifdef VOYAGERFB_MODE_SETTING
        voyagerfb_ddc_read(sc);
#endif

        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_DRAM_CONTROL);
        switch(reg & 0x0000e000) {
                case SM502_MEM_2M:
                        sc->sc_fbsize = 2 * 1024 * 1024;
                        break;
                case SM502_MEM_4M:
                        sc->sc_fbsize = 4 * 1024 * 1024;
                        break;
                case SM502_MEM_8M:
                        sc->sc_fbsize = 8 * 1024 * 1024;
                        break;
                case SM502_MEM_16M:
                        sc->sc_fbsize = 16 * 1024 * 1024;
                        break;
                case SM502_MEM_32M:
                        sc->sc_fbsize = 32 * 1024 * 1024;
                        break;
                case SM502_MEM_64M:
                        sc->sc_fbsize = 64 * 1024 * 1024;
                        break;
        }

        sc->sc_width = (bus_space_read_4(sc->sc_memt, sc->sc_regh,      
                SM502_PANEL_FB_WIDTH) & SM502_FBW_WIN_WIDTH_MASK) >> 16;
        sc->sc_height = (bus_space_read_4(sc->sc_memt, sc->sc_regh,     
                SM502_PANEL_FB_HEIGHT) & SM502_FBH_WIN_HEIGHT_MASK) >> 16;

        /*
         * Demand an enabled panel to attach...
         */
        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh,
            SM502_PANEL_DISP_CTRL);
        if (sc->sc_fbsize == 0 ||
            (reg & SM502_PDC_PANEL_ENABLE) == 0 ||
            sc->sc_width == 0 ||
            (uint32_t)sc->sc_width * sc->sc_height > sc->sc_fbsize) {
                aprint_normal_dev(self,
                    "panel not initialized by firmware, not attaching\n");
                return;
        }

#ifdef VOYAGERFB_MODE_SETTING
        /*
         * Switch to the best mode the monitor advertises via EDID.  
         */
        {
                const struct videomode *vm = voyagerfb_pick_mode(sc);

                if (vm != NULL) {
                        voyagerfb_set_mode(sc, vm);
                        sc->sc_width = vm->hdisplay;
                        sc->sc_height = vm->vdisplay;
                        aprint_normal_dev(self,
                            "mode set to %dx%d from EDID\n",
                            vm->hdisplay, vm->vdisplay);
                }
        }
#endif

#ifdef VOYAGERFB_DEPTH_32
        sc->sc_depth = 32;
#else
        sc->sc_depth = 8;
#endif

        /*
         * XXX yeah, casting the fb address to uint32_t is formally wrong
         * but as far as I know there are no SM502 with 64bit BARs
         */
        aprint_normal_dev(self, "%d MB video memory at 0x%08x\n",
            (int)(sc->sc_fbsize >> 20), (uint32_t)sc->sc_fb);

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

        aprint_normal_dev(self, "%d x %d, %d bit, stride %d\n", 
                sc->sc_width, sc->sc_height, sc->sc_depth, sc->sc_stride);

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

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

        /* backlight control */
        voyagerfb_setup_backlight(sc);

        ri = &sc->sc_console_screen.scr_ri;

        sc->sc_gc.gc_bitblt = voyagerfb_bitblt;
        sc->sc_gc.gc_blitcookie = sc;
        sc->sc_gc.gc_rop = ROP_COPY;
        if (is_console) {
                vcons_init_screen(&sc->vd, &sc->sc_console_screen, 1,
                    &defattr);
                sc->sc_console_screen.scr_flags |= VCONS_SCREEN_IS_STATIC;

                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;
        } else {
                if (sc->sc_console_screen.scr_ri.ri_rows == 0) {
                        /* do some minimal setup to avoid weirdness 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,
                        ((sc->sc_fbsize - 16 * 64) / sc->sc_stride) - 
                            sc->sc_height,
                        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);

        rasops_get_cmap(ri, cmap, sizeof(cmap));
        j = 0;
        if (sc->sc_depth <= 8) {
                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];
                        voyagerfb_putpalreg(sc, i, cmap[j], cmap[j + 1],
                            cmap[j + 2]);
                        j += 3;
                }
        }

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

        if (is_console)
                vcons_replay_msgbuf(&sc->sc_console_screen);

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

        config_found(sc->sc_dev, &aa, wsemuldisplaydevprint,
            CFARGS(.iattr = "wsemuldisplaydev"));
}

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

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

        /* PCI config read/write pass through. */
        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(device_parent(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 = 32;
                wdf->cmsize = 256;
                return 0;

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

        case WSDISPLAYIO_PUTCMAP:
                return voyagerfb_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) {
#ifdef VOYAGERFB_DEPTH_32
                                sc->sc_depth = 32;
#else
                                sc->sc_depth = 8;
#endif
                                glyphcache_wipe(&sc->sc_gc);
                                voyagerfb_init(sc);
                                voyagerfb_restore_palette(sc);
                                vcons_redraw_screen(ms);
                        } else {
                                sc->sc_depth = 32;
                                voyagerfb_init(sc);
                        }
                }
                }
                return 0;

        case WSDISPLAYIO_GVIDEO:
                *(int *)data = sc->sc_bl_on ? WSDISPLAYIO_VIDEO_ON :
                                              WSDISPLAYIO_VIDEO_OFF;
                return 0;

        case WSDISPLAYIO_SVIDEO: {
                        int new_bl = *(int *)data;

                        voyagerfb_switch_backlight(sc,  new_bl);
                }
                return 0;

        case WSDISPLAYIO_GETPARAM:
                param = (struct wsdisplay_param *)data;
                switch (param->param) {
                case WSDISPLAYIO_PARAM_BRIGHTNESS:
                        param->min = 0;
                        param->max = 255;
                        param->curval = sc->sc_bl_level;
                        return 0;
                case WSDISPLAYIO_PARAM_BACKLIGHT:
                        param->min = 0;
                        param->max = 1;
                        param->curval = sc->sc_bl_on;
                        return 0;
                }
                return EPASSTHROUGH;

        case WSDISPLAYIO_SETPARAM:
                param = (struct wsdisplay_param *)data;
                switch (param->param) {
                case WSDISPLAYIO_PARAM_BRIGHTNESS:
                        voyagerfb_set_backlight(sc, param->curval);
                        return 0;
                case WSDISPLAYIO_PARAM_BACKLIGHT:
                        voyagerfb_switch_backlight(sc,  param->curval);
                        return 0;
                }
                return EPASSTHROUGH;

        case WSDISPLAYIO_GCURPOS:
                {
                        struct wsdisplay_curpos *pos;

                        pos = (struct wsdisplay_curpos *)data;
                        pos->x = sc->sc_cur_x;
                        pos->y = sc->sc_cur_y;
                }
                return 0;

        case WSDISPLAYIO_SCURPOS:
                {
                        struct wsdisplay_curpos *pos;

                        pos = (struct wsdisplay_curpos *)data;
                        voyagerfb_set_curpos(sc, pos->x, pos->y);
                }
                return 0;

        case WSDISPLAYIO_GCURMAX:
                {
                        struct wsdisplay_curpos *pos;

                        pos = (struct wsdisplay_curpos *)data;
                        pos->x = 64;
                        pos->y = 64;
                }
                return 0;

        case WSDISPLAYIO_GCURSOR:
                {
                        struct wsdisplay_cursor *cu;

                        cu = (struct wsdisplay_cursor *)data;
                        return voyagerfb_gcursor(sc, cu);
                }

        case WSDISPLAYIO_SCURSOR:
                {
                        struct wsdisplay_cursor *cu;

                        cu = (struct wsdisplay_cursor *)data;
                        return voyagerfb_scursor(sc, cu);
                }

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

static paddr_t
voyagerfb_mmap(void *v, void *vs, off_t offset, int prot)
{
        struct vcons_data *vd = v;
        struct voyagerfb_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 privileges
         */
        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, 0);
                return pa;
        }

        return -1;
}

static void
voyagerfb_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
        struct voyagerfb_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_FULLCLEAR;

        ri->ri_bits = (char *)sc->sc_fbaddr;

        if (existing) {
                ri->ri_flg |= RI_CLEAR;
        }

        if (sc->sc_depth == 8) {
                ri->ri_flg |= RI_8BIT_IS_RGB;
#ifdef VOYAGERFB_ANTIALIAS
                ri->ri_flg |= RI_ENABLE_ALPHA | RI_PREFER_ALPHA;
#endif
        }
        if (sc->sc_depth == 32) {
#ifdef VOYAGERFB_ANTIALIAS
                ri->ri_flg |= RI_ENABLE_ALPHA;
#endif
                /* we always run in RGB */
                ri->ri_rnum = 8;
                ri->ri_gnum = 8;
                ri->ri_bnum = 8;
                ri->ri_rpos = 16;
                ri->ri_gpos = 8;
                ri->ri_bpos = 0;
        }

        scr->scr_flags |= VCONS_LOADFONT;

        rasops_init(ri, 0, 0);
        ri->ri_caps = WSSCREEN_WSCOLORS | WSSCREEN_HILIT | 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 = voyagerfb_copyrows;
        ri->ri_ops.copycols = voyagerfb_copycols;
        ri->ri_ops.eraserows = voyagerfb_eraserows;
        ri->ri_ops.erasecols = voyagerfb_erasecols;
        ri->ri_ops.cursor = voyagerfb_cursor;
        if (FONT_IS_ALPHA(ri->ri_font)) {
                switch (sc->sc_depth) {
                        case 32:
                                ri->ri_ops.putchar = voyagerfb_putchar_aa32;
                                break;
                        case 8:
                                ri->ri_ops.putchar = voyagerfb_putchar_aa8;
                                break;
                        default:
                                printf("alpha font at %d!?\n", sc->sc_depth);
                }
        } else
                ri->ri_ops.putchar = voyagerfb_putchar_mono;
}

static int
voyagerfb_putcmap(struct voyagerfb_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 VOYAGERFB_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++) {
                voyagerfb_putpalreg(sc, index, *r, *g, *b);
                index++;
                r++, g++, b++;
        }
        return 0;
}

static int
voyagerfb_getcmap(struct voyagerfb_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
voyagerfb_restore_palette(struct voyagerfb_softc *sc)
{
        int i;

        for (i = 0; i < 256; i++) {
                voyagerfb_putpalreg(sc, i, sc->sc_cmap_red[i],
                    sc->sc_cmap_green[i], sc->sc_cmap_blue[i]);
        }
}

static int
voyagerfb_putpalreg(struct voyagerfb_softc *sc, int idx, uint8_t r,
    uint8_t g, uint8_t b)
{
        uint32_t reg;

        reg = (r << 16) | (g << 8) | b;
        /* XXX we should probably write the CRT palette too */
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            SM502_PALETTE_PANEL + (idx << 2), reg);
        return 0;
}

static void
voyagerfb_init(struct voyagerfb_softc *sc)
{
        int reg;

        voyagerfb_wait(sc);
        /* disable colour compare */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_COLOR_COMP_MASK, 0);
        /* allow writes to all planes */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PLANEMASK,
            0xffffffff);
        /* disable clipping */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CLIP_TOP_LEFT, 0);
        /* source and destination in local memory, no offset */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_SRC_BASE, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DST_BASE, 0);
        /* pitch is screen stride */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PITCH,
            sc->sc_width | (sc->sc_width << 16));
        /* window is screen width */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_WINDOW_WIDTH,
            sc->sc_width | (sc->sc_width << 16));
        reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL);
        reg &= ~SM502_PDC_DEPTH_MASK;
        
        switch (sc->sc_depth) {
                case 8:
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            SM502_STRETCH, SM502_STRETCH_8BIT);
                        sc->sc_stride = sc->sc_width;
                        reg |= SM502_PDC_8BIT;
                        break;
                case 16:
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            SM502_STRETCH, SM502_STRETCH_16BIT);
                        sc->sc_stride = sc->sc_width << 1;
                        reg |= SM502_PDC_16BIT;
                        break;
                case 24:
                case 32:
                        bus_space_write_4(sc->sc_memt, sc->sc_regh, 
                            SM502_STRETCH, SM502_STRETCH_32BIT);
                        sc->sc_stride = sc->sc_width << 2;
                        reg |= SM502_PDC_32BIT;
                        break;
        }
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_FB_OFFSET,
            (sc->sc_stride << 16) | sc->sc_stride);

        /* clear the screen... */
        voyagerfb_rectfill(sc, 0, 0, sc->sc_width, sc->sc_height, 0);

        /* ...and then switch colour depth. For aesthetic reasons. */
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_DISP_CTRL,
            reg);

        /* put the cursor at the end of video memory */
        sc->sc_cursor_addr = sc->sc_fbsize - 16 * 64;   /* XXX */
        DPRINTF("%s: %08x\n", __func__, sc->sc_cursor_addr); 
        sc->sc_cursor = (uint32_t *)((uint8_t *)bus_space_vaddr(sc->sc_memt,
                         sc->sc_fbh) + sc->sc_cursor_addr);
#ifdef VOYAGERFB_DEBUG
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_CRSR_XY,
                                                         0x00100010);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_CRSR_COL12,
                                                         0x0000ffff);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_CRSR_COL3,
                                                         0x0000f800);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_CRSR_ADDR,
            SM502_CRSR_ENABLE | sc->sc_cursor_addr);
        sc->sc_cursor[0] = 0x00000000;
        sc->sc_cursor[1] = 0x00000000;
        sc->sc_cursor[2] = 0xffffffff;
        sc->sc_cursor[3] = 0xffffffff;
        sc->sc_cursor[4] = 0xaaaaaaaa;
        sc->sc_cursor[5] = 0xaaaaaaaa;
        sc->sc_cursor[6] = 0xffffffff;
        sc->sc_cursor[7] = 0x00000000;
#else
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_CRSR_ADDR,
            sc->sc_cursor_addr);
#endif
}

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

        voyagerfb_ready(sc);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CONTROL,
            ROP_COPY |
            SM502_CTRL_USE_ROP2 |
            SM502_CTRL_CMD_RECTFILL |
            SM502_CTRL_QUICKSTART_E);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_FOREGROUND,
            colour);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DST,
            (x << 16) | y);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DIMENSION,
            (wi << 16) | he);
}

static void
voyagerfb_bitblt(void *cookie, int xs, int ys, int xd, int yd,
    int wi, int he, int rop)
{
        struct voyagerfb_softc *sc = cookie;
        uint32_t cmd;

        cmd = (rop & 0xf) | SM502_CTRL_USE_ROP2 | SM502_CTRL_CMD_BITBLT |
              SM502_CTRL_QUICKSTART_E;

        voyagerfb_ready(sc);

        if (xd <= xs) {
                /* left to right */
        } else {
                /*
                 * According to the manual this flag reverses only the blitter's
                 * X direction. At least on my Gdium it also reverses the Y
                 * direction
                 */ 
                cmd |= SM502_CTRL_R_TO_L;
                xs += wi - 1;
                xd += wi - 1;
                ys += he - 1;
                yd += he - 1;
        }
        
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CONTROL, cmd);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_SRC,
            (xs << 16) | ys);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DST,
            (xd << 16) | yd);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DIMENSION,
            (wi << 16) | he);
}

static void
voyagerfb_cursor(void *cookie, int on, int row, int col)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct voyagerfb_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) {
                        voyagerfb_bitblt(sc, x, y, x, y, wi, he, ROP_INVERT);
                        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;
                        voyagerfb_bitblt(sc, x, y, x, y, wi, he, ROP_INVERT);
                        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 inline void
voyagerfb_feed8(struct voyagerfb_softc *sc, uint8_t *data, int len)
{
        uint32_t *port = (uint32_t *)sc->sc_dataport;
        int i;

        for (i = 0; i < ((len + 3) & 0xfffc); i++) {
                *port = htole32(*data);
                data++;
        }
}

static inline void
voyagerfb_feed16(struct voyagerfb_softc *sc, uint16_t *data, int len)
{
        uint32_t *port = (uint32_t *)sc->sc_dataport;
        uint8_t *d8 = (uint8_t *)data;
        int i;

        len = len << 1;
        for (i = 0; i < ((len + 1) & 0xfffe); i++) {
                *port = htole32(le16dec(d8));
                d8 += 2;
        }
}

static void
voyagerfb_putchar_mono(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 voyagerfb_softc *sc = scr->scr_cookie;
        uint32_t cmd;
        int fg, bg;
        uint8_t *data;
        int x, y, wi, he;

        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) & 0x0f];
        fg = ri->ri_devcmap[(attr >> 24) & 0x0f];
        x = ri->ri_xorigin + col * wi;
        y = ri->ri_yorigin + row * he;
        if (c == 0x20) {
                voyagerfb_rectfill(sc, x, y, wi, he, bg);
                return;
        }

        data = WSFONT_GLYPH(c, font);

        cmd = ROP_COPY |
              SM502_CTRL_USE_ROP2 |
              SM502_CTRL_CMD_HOSTWRT |
              SM502_CTRL_HOSTBLT_MONO |
              SM502_CTRL_QUICKSTART_E | 
              SM502_CTRL_MONO_PACK_32BIT;
        voyagerfb_ready(sc);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CONTROL, cmd);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_FOREGROUND, fg);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_BACKGROUND, bg);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_SRC, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DST, (x << 16) | y);
        bus_space_write_4(sc->sc_memt, sc->sc_regh,
            SM502_DIMENSION, (wi << 16) | he);
        /* now feed the data, padded to 32bit */
        switch (ri->ri_font->stride) {
                case 1:
                        voyagerfb_feed8(sc, data, ri->ri_fontscale);
                        break;
                case 2:
                        voyagerfb_feed16(sc, (uint16_t *)data,
                            ri->ri_fontscale);
                        break;          
        }       
}

static void
voyagerfb_putchar_aa32(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 voyagerfb_softc *sc = scr->scr_cookie;
        uint32_t cmd;
        int fg, bg;
        uint8_t *data;
        int x, y, wi, he;
        int i, j, r, g, b, aval, pad;
        int rf, gf, bf, rb, gb, bb;
        uint32_t pixel;
        int rv;

        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) & 0x0f];
        fg = ri->ri_devcmap[(attr >> 24) & 0x0f];
        x = ri->ri_xorigin + col * wi;
        y = ri->ri_yorigin + row * he;
        if (c == 0x20) {
                voyagerfb_rectfill(sc, x, y, wi, he, bg);
                return;
        }

        data = WSFONT_GLYPH(c, font);
        /*
         * we can't accelerate the actual alpha blending but
         * we can at least use a host blit to go through the
         * pipeline instead of having to sync the engine
         */

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

        cmd = ROP_COPY |
              SM502_CTRL_USE_ROP2 |
              SM502_CTRL_CMD_HOSTWRT |
              SM502_CTRL_QUICKSTART_E;
        voyagerfb_ready(sc);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CONTROL, cmd);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_SRC, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DST, (x << 16) | y);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DIMENSION,
            (wi << 16) | he);
        rf = (fg >> 16) & 0xff;
        rb = (bg >> 16) & 0xff;
        gf = (fg >> 8) & 0xff;
        gb = (bg >> 8) & 0xff;
        bf =  fg & 0xff;
        bb =  bg & 0xff;
        pad = wi & 1;
        for (i = 0; i < he; i++) {
                for (j = 0; j < wi; j++) {
                        aval = *data;
                        data++;
                        if (aval == 0) {
                                pixel = bg;
                        } else if (aval == 255) {
                                pixel = fg;
                        } else {
                                r = aval * rf + (255 - aval) * rb;
                                g = aval * gf + (255 - aval) * gb;
                                b = aval * bf + (255 - aval) * bb;
                                pixel = (r & 0xff00) << 8 |
                                        (g & 0xff00) |
                                        (b & 0xff00) >> 8;
                        }
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            SM502_DATAPORT, pixel);
                }
                if (pad)
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            SM502_DATAPORT, 0);
        }
        if (rv == GC_ADD) {
                glyphcache_add(&sc->sc_gc, c, x, y);
        }
}

static void
voyagerfb_putchar_aa8(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 voyagerfb_softc *sc = scr->scr_cookie;
        uint32_t cmd;
        int bg;
        uint8_t *data;
        int x, y, wi, he;
        int i, j, r, g, b, aval, pad;
        int r1, g1, b1, r0, g0, b0, fgo, bgo;
        uint32_t pixel = 0, latch = 0, bg8, fg8;
        int rv;

        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) & 0x0f];
        x = ri->ri_xorigin + col * wi;
        y = ri->ri_yorigin + row * he;
        if (c == 0x20) {
                voyagerfb_rectfill(sc, x, y, wi, he, bg);
                return;
        }

        data = WSFONT_GLYPH(c, font);
        /*
         * we can't accelerate the actual alpha blending but
         * we can at least use a host blit to go through the
         * pipeline instead of having to sync the engine
         */

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

        cmd = ROP_COPY |
              SM502_CTRL_USE_ROP2 |
              SM502_CTRL_CMD_HOSTWRT |
              SM502_CTRL_QUICKSTART_E;
        voyagerfb_ready(sc);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_CONTROL, cmd);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_SRC, 0);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DST, (x << 16) | y);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_DIMENSION,
            (wi << 16) | he);

        /*
         * 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];
        r1 = rasops_cmap[fgo];
        g0 = rasops_cmap[bgo + 1];
        g1 = rasops_cmap[fgo + 1];
        b0 = rasops_cmap[bgo + 2];
        b1 = rasops_cmap[fgo + 2];
#define R3G3B2(r, g, b) ((r & 0xe0) | ((g >> 3) & 0x1c) | (b >> 6))
        bg8 = R3G3B2(r0, g0, b0);
        fg8 = R3G3B2(r1, g1, b1);

        pad = wi & 4;
        for (i = 0; i < he; i++) {
                for (j = 0; j < wi; j++) {
                        aval = *data;
                        data++;
                        if (aval == 0) {
                                pixel = bg8;
                        } else if (aval == 255) {
                                pixel = fg8;
                        } 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 = (latch << 8) | pixel;
                        /* write in 32bit chunks */
                        if ((j & 3) == 3) {
                                bus_space_write_4(sc->sc_memt, sc->sc_regh,
                                    SM502_DATAPORT, bswap32(latch));
                                latch = 0;
                        }
                }
                /* if we have pixels left in latch write them out */
                if ((j & 3) != 0) {
                        latch = latch << ((4 - (i & 3)) << 3);
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            SM502_DATAPORT, bswap32(latch));
                }
                if (pad)
                        bus_space_write_4(sc->sc_memt, sc->sc_regh,
                            SM502_DATAPORT, 0);
        }
        if (rv == GC_ADD) {
                glyphcache_add(&sc->sc_gc, c, x, y);
        }
}

static void
voyagerfb_copycols(void *cookie, int row, int srccol, int dstcol, int ncols)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct voyagerfb_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;
                voyagerfb_bitblt(sc, xs, y, xd, y, width, height, ROP_COPY);
        }
}

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

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

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

        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;
                if ((nrows > 1) && (dstrow > srcrow)) {
                        /*
                         * the blitter can't do bottom-up copies so we have
                         * to copy line by line here
                         * should probably use a command sequence
                         */
                        ys += (height - ri->ri_font->fontheight);
                        yd += (height - ri->ri_font->fontheight);
                        for (i = 0; i < nrows; i++) {
                                voyagerfb_bitblt(sc, x, ys, x, yd, width, 
                                    ri->ri_font->fontheight, ROP_COPY);
                                ys -= ri->ri_font->fontheight;
                                yd -= ri->ri_font->fontheight;
                        }
                } else
                        voyagerfb_bitblt(sc, x, ys, x, yd, width, height, 
                            ROP_COPY);
        }
}

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

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

/* backlight control */
static void
voyagerfb_setup_backlight(struct voyagerfb_softc *sc)
{
        /* switch the pin to gpio mode if it isn't already */
        voyager_control_gpio(sc->sc_gpio_cookie, ~GPIO_BACKLIGHT, 0);
        /* turn it on */
        voyager_write_gpio(sc->sc_gpio_cookie, 0xffffffff, GPIO_BACKLIGHT);
        sc->sc_bl_on = 1;
        sc->sc_bl_level = 255;
        pmf_event_register(sc->sc_dev, PMFE_DISPLAY_BRIGHTNESS_UP,
            voyagerfb_brightness_up, TRUE);
        pmf_event_register(sc->sc_dev, PMFE_DISPLAY_BRIGHTNESS_DOWN,
            voyagerfb_brightness_down, TRUE);
}

static void
voyagerfb_set_backlight(struct voyagerfb_softc *sc, int level)
{

        /*
         * should we do nothing when backlight is off, should we just store the
         * level and use it when turning back on or should we just flip sc_bl_on
         * and turn the backlight on?
         * For now turn it on so a crashed screensaver can't get the user stuck
         * with a dark screen as long as hotkeys work
         */
        if (level > 255) level = 255;
        if (level < 0) level = 0;
        if (level == sc->sc_bl_level)
                return;
        sc->sc_bl_level = level;
        if (sc->sc_bl_on == 0)
                sc->sc_bl_on = 1;
        /* and here we would actually muck with the hardware */
        if ((level == 0) || (level == 255)) {
                /* in these cases bypass the PWM and use the gpio */
                voyager_control_gpio(sc->sc_gpio_cookie, ~GPIO_BACKLIGHT, 0);
                if (level == 0) {
                        voyager_write_gpio(sc->sc_gpio_cookie,
                            ~GPIO_BACKLIGHT, 0);
                } else {
                        voyager_write_gpio(sc->sc_gpio_cookie,
                            0xffffffff, GPIO_BACKLIGHT);
                }
        } else {
                uint32_t pwm;

                pwm = voyager_set_pwm(20000, level * 1000 / 256);
                pwm |= SM502_PWM_ENABLE;
                bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PWM0, pwm);

                /* let the PWM take over */
                voyager_control_gpio(sc->sc_gpio_cookie,
                    0xffffffff, GPIO_BACKLIGHT);
        }
}

static void
voyagerfb_switch_backlight(struct voyagerfb_softc *sc, int on)
{

        if (on == sc->sc_bl_on)
                return;
        sc->sc_bl_on = on;
        if (on) {
                int level = sc->sc_bl_level;

                sc->sc_bl_level = -1;
                voyagerfb_set_backlight(sc, level);
        } else {
                voyager_control_gpio(sc->sc_gpio_cookie, ~GPIO_BACKLIGHT, 0);
                voyager_write_gpio(sc->sc_gpio_cookie, ~GPIO_BACKLIGHT, 0);
        }
}
        

static void
voyagerfb_brightness_up(device_t dev)
{
        struct voyagerfb_softc *sc = device_private(dev);

        voyagerfb_set_backlight(sc, sc->sc_bl_level + 8);
}

static void
voyagerfb_brightness_down(device_t dev)
{
        struct voyagerfb_softc *sc = device_private(dev);

        voyagerfb_set_backlight(sc, sc->sc_bl_level - 8);
}

static int
voyagerfb_set_curpos(struct voyagerfb_softc *sc, int x, int y)
{
        uint32_t val;
        int xx, yy;

        sc->sc_cur_x = x;
        sc->sc_cur_y = y;

        xx = x - sc->sc_hot_x;
        yy = y - sc->sc_hot_y;
        
        if (xx < 0) xx = abs(xx) | 0x800;
        if (yy < 0) yy = abs(yy) | 0x800;
        
        val = (xx & 0xffff) | (yy << 16);
        bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_PANEL_CRSR_XY, val);

        return 0;
}

static int
voyagerfb_gcursor(struct voyagerfb_softc *sc, struct wsdisplay_cursor *cur)
{
        /* do nothing for now */
        return 0;
}

static int
voyagerfb_scursor(struct voyagerfb_softc *sc, struct wsdisplay_cursor *cur)
{
        if (cur->which & WSDISPLAY_CURSOR_DOCUR) {

                bus_space_write_4(sc->sc_memt, sc->sc_regh,
                    SM502_PANEL_CRSR_ADDR,
                    sc->sc_cursor_addr | (cur->enable ? SM502_CRSR_ENABLE : 0));
                DPRINTF("%s: %08x\n", __func__, sc->sc_cursor_addr);
        }
        if (cur->which & WSDISPLAY_CURSOR_DOHOT) {

                sc->sc_hot_x = cur->hot.x;
                sc->sc_hot_y = cur->hot.y;
        }
        if (cur->which & WSDISPLAY_CURSOR_DOPOS) {

                voyagerfb_set_curpos(sc, cur->pos.x, cur->pos.y);
        }
        if (cur->which & WSDISPLAY_CURSOR_DOCMAP) {
                int i, idx;
                uint32_t val;
        
                for (i = 0; i < cur->cmap.count; i++) {
                        val = ((cur->cmap.red[i] & 0xf8) << 8) |
                              ((cur->cmap.green[i] & 0xfc) << 3) |
                              ((cur->cmap.blue[i] & 0xf8) >> 3);
                        idx = i + cur->cmap.index;
                        bus_space_write_2(sc->sc_memt, sc->sc_regh,
                            SM502_PANEL_CRSR_COL12 + (idx << 1),
                            val);
                        /*
                         * if userland doesn't try to set the 3rd colour we
                         * assume it expects an X11-style 2 colour cursor
                         * X should be our main user anyway
                         */
                        if ((idx == 1) && 
                           ((cur->cmap.count + cur->cmap.index) < 3)) {
                                bus_space_write_2(sc->sc_memt, sc->sc_regh,
                                    SM502_PANEL_CRSR_COL3,
                                    val);
                        }
                        DPRINTF("%s: %d %04x\n", __func__, i + cur->cmap.index,
                            val);
                }
        }
        if (cur->which & WSDISPLAY_CURSOR_DOSHAPE) {

                int i, j, cnt = 0;
                uint32_t latch = 0, omask;
                uint8_t imask;
                DPRINTF("%s: %d %d\n", __func__, cur->size.x, cur->size.y);
                for (i = 0; i < 256; i++) {
                        omask = 0x00000001;
                        imask = 0x01;
                        cur->image[cnt] &= cur->mask[cnt];
                        for (j = 0; j < 8; j++) {
                                if (cur->mask[cnt] & imask)
                                        latch |= omask;
                                omask <<= 1;
                                if (cur->image[cnt] & imask)
                                        latch |= omask;
                                omask <<= 1;
                                imask <<= 1;
                        }
                        cnt++;
                        imask = 0x01;
                        cur->image[cnt] &= cur->mask[cnt];
                        for (j = 0; j < 8; j++) {
                                if (cur->mask[cnt] & imask)
                                        latch |= omask;
                                omask <<= 1;
                                if (cur->image[cnt] & imask)
                                        latch |= omask;
                                omask <<= 1;
                                imask <<= 1;
                        }
                        cnt++;
                        sc->sc_cursor[i] = latch;
                        latch = 0;
                }                               
        }
        return 0;
}