/*      $NetBSD: ct65550.c,v 1.15 2021/08/07 16:19:12 thorpej Exp $     */

/*
 * Copyright (c) 2006 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 Chips & Technologies 65550 graphics controllers
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ct65550.c,v 1.15 2021/08/07 16:19:12 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/kauth.h>
#include <sys/bus.h>
#include <dev/videomode/videomode.h>

#include <dev/ic/ct65550reg.h>
#include <dev/ic/ct65550var.h>

#include "opt_wsemul.h"
#include "opt_chipsfb.h"

static struct vcons_screen chipsfb_console_screen;

extern const u_char rasops_cmap[768];

static void     chipsfb_init(struct chipsfb_softc *);

static void     chipsfb_cursor(void *, int, int, int);
static void     chipsfb_copycols(void *, int, int, int, int);
static void     chipsfb_erasecols(void *, int, int, int, long);
static void     chipsfb_copyrows(void *, int, int, int);
static void     chipsfb_eraserows(void *, int, int, long);

#if 0
static int      chipsfb_allocattr(void *, int, int, int, long *);
static void     chipsfb_scroll(void *, void *, int);
static int      chipsfb_load_font(void *, void *, struct wsdisplay_font *);
#endif

static int      chipsfb_putcmap(struct chipsfb_softc *,
                            struct wsdisplay_cmap *);
static int      chipsfb_getcmap(struct chipsfb_softc *,
                            struct wsdisplay_cmap *);
static int      chipsfb_putpalreg(struct chipsfb_softc *, uint8_t, uint8_t,
                            uint8_t, uint8_t);

static void     chipsfb_bitblt(void *, int, int, int, int,
                            int, int, int);
static void     chipsfb_rectfill(struct chipsfb_softc *, int, int, int, int,
                            int);
static void     chipsfb_putchar(void *, int, int, u_int, long);
static void     chipsfb_putchar_aa(void *, int, int, u_int, long);
static void     chipsfb_setup_mono(struct chipsfb_softc *, int, int, int,
                            int, uint32_t, uint32_t);
static void     chipsfb_feed(struct chipsfb_softc *, int, uint8_t *);

#if 0
static void     chipsfb_showpal(struct chipsfb_softc *);
#endif
static void     chipsfb_restore_palette(struct chipsfb_softc *);

static void     chipsfb_wait_idle(struct chipsfb_softc *);

struct wsscreen_descr chipsfb_defaultscreen = {
        "default",      /* name */
        0, 0,           /* ncols, nrows */
        NULL,           /* textops */
        8, 16,          /* fontwidth, fontheight */
        WSSCREEN_WSCOLORS | WSSCREEN_HILIT, /* capabilities */
        NULL,           /* modecookie */
};

const struct wsscreen_descr *_chipsfb_scrlist[] = {
        &chipsfb_defaultscreen,
        /* XXX other formats, graphics screen? */
};

struct wsscreen_list chipsfb_screenlist = {
        sizeof(_chipsfb_scrlist) / sizeof(struct wsscreen_descr *), _chipsfb_scrlist
};

static int      chipsfb_ioctl(void *, void *, u_long, void *, int,
                    struct lwp *);
static paddr_t  chipsfb_mmap(void *, void *, off_t, int);
static void     chipsfb_clearscreen(struct chipsfb_softc *);
static void     chipsfb_init_screen(void *, struct vcons_screen *, int,
                            long *);


struct wsdisplay_accessops chipsfb_accessops = {
        chipsfb_ioctl,
        chipsfb_mmap,
        NULL,   /* vcons_alloc_screen */
        NULL,   /* vcons_free_screen */
        NULL,   /* vcons_show_screen */
        NULL,   /* load_font */
        NULL,   /* polls */
        NULL,   /* scroll */
};

/*
 * Inline functions for getting access to register aperture.
 */
static inline void
chipsfb_write32(struct chipsfb_softc *sc, uint32_t reg, uint32_t val)
{
        bus_space_write_4(sc->sc_memt, sc->sc_mmregh, reg, val);
}

static inline uint32_t
chipsfb_read32(struct chipsfb_softc *sc, uint32_t reg)
{
        return bus_space_read_4(sc->sc_memt, sc->sc_mmregh, reg);
}

static inline void
chipsfb_write_vga(struct chipsfb_softc *sc, uint32_t reg,  uint8_t val)
{
        bus_space_write_1(sc->sc_iot, sc->sc_ioregh, reg, val);
}

static inline uint8_t
chipsfb_read_vga(struct chipsfb_softc *sc, uint32_t reg)
{
        return bus_space_read_1(sc->sc_iot, sc->sc_ioregh, reg);
}

static inline uint8_t
chipsfb_read_indexed(struct chipsfb_softc *sc, uint32_t reg, uint8_t index)
{

        chipsfb_write_vga(sc, reg & 0xfffe, index);
        return chipsfb_read_vga(sc, reg | 0x0001);
}

static inline void
chipsfb_write_indexed(struct chipsfb_softc *sc, uint32_t reg, uint8_t index,
    uint8_t val)
{

        chipsfb_write_vga(sc, reg & 0xfffe, index);
        chipsfb_write_vga(sc, reg | 0x0001, val);
}

static void
chipsfb_wait_idle(struct chipsfb_softc *sc)
{

#ifdef CHIPSFB_DEBUG
        chipsfb_write32(sc, CT_OFF_FB + (800 * 598) - 4, 0);
#endif

        /* spin until the blitter is idle */
        while ((chipsfb_read32(sc, CT_BLT_CONTROL) & BLT_IS_BUSY) != 0) {
        }

#ifdef CHIPSFB_DEBUG
        chipsfb_write32(sc, CT_OFF_FB + (800 * 598) - 4, 0xffffffff);
#endif
}

void
chipsfb_do_attach(struct chipsfb_softc *sc)
{
        struct wsemuldisplaydev_attach_args aa;
        struct rasops_info *ri;
        prop_dictionary_t dict;
        ulong defattr;
        bool console = false;
        int width, height, i, j;
        uint32_t bg, fg, ul;
        uint8_t cmap[768];

        dict = device_properties(sc->sc_dev);
        sc->sc_mode = WSDISPLAYIO_MODE_EMUL;
        sc->sc_dacw = -1;

#ifdef CHIPSFB_DEBUG
        printf(prop_dictionary_externalize(dict));
#endif
        chipsfb_init(sc);

        width = height = -1;

        /* detect panel size */
        width = chipsfb_read_indexed(sc, CT_FP_INDEX, FP_HSIZE_LSB);
        width |= (chipsfb_read_indexed(sc, CT_FP_INDEX, FP_HORZ_OVERFLOW_1)
            & 0x0f) << 8;
        width = (width + 1) * 8;
        height = chipsfb_read_indexed(sc, CT_FP_INDEX, FP_VSIZE_LSB);
        height |= (chipsfb_read_indexed(sc, CT_FP_INDEX, FP_VERT_OVERFLOW_1)
            & 0x0f) << 8;
        height++;
        if ((width < 640) || ( width > 1280) || (height < 480) ||
            (height > 1024)) {
                /* no sane values in the panel registers */
                width = height = -1;
        } else
                aprint_verbose("Panel size: %d x %d\n", width, height);

        if (!prop_dictionary_get_uint32(dict, "width", &sc->sc_width))
                sc->sc_width = width;
        if (!prop_dictionary_get_uint32(dict, "height", &sc->sc_height))
                sc->sc_height = height;
        if (!prop_dictionary_get_uint32(dict, "depth", &sc->sc_bits_per_pixel))
                sc->sc_bits_per_pixel = 8;
        if (!prop_dictionary_get_uint32(dict, "linebytes", &sc->sc_linebytes))
                sc->sc_linebytes = (sc->sc_width * sc->sc_bits_per_pixel) >> 3;

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

#ifdef notyet
        /* XXX this should at least be configurable via kernel config */
        chipsfb_set_videomode(sc, &videomode_list[16]);
#endif

        vcons_init(&sc->vd, sc, &chipsfb_defaultscreen, &chipsfb_accessops);
        sc->vd.init_screen = chipsfb_init_screen;

        sc->sc_gc.gc_bitblt = chipsfb_bitblt;
        sc->sc_gc.gc_blitcookie = sc;
        sc->sc_gc.gc_rop = ROP_COPY;

        ri = &chipsfb_console_screen.scr_ri;
        if (console) {
                vcons_init_screen(&sc->vd, &chipsfb_console_screen, 1,
                    &defattr);
                chipsfb_console_screen.scr_flags |= VCONS_SCREEN_IS_STATIC;

                chipsfb_defaultscreen.textops = &ri->ri_ops;
                chipsfb_defaultscreen.capabilities = ri->ri_caps;
                chipsfb_defaultscreen.nrows = ri->ri_rows;
                chipsfb_defaultscreen.ncols = ri->ri_cols;
                glyphcache_init(&sc->sc_gc, sc->sc_height + 1,
                                (sc->sc_fbsize / sc->sc_linebytes) - sc->sc_height - 1,
                                sc->sc_width,
                                ri->ri_font->fontwidth,
                                ri->ri_font->fontheight,
                                defattr);
                wsdisplay_cnattach(&chipsfb_defaultscreen, ri, 0, 0, defattr);
        } else {
                if (chipsfb_console_screen.scr_ri.ri_rows == 0) {
                        /* do some minimal setup to avoid weirdnesses later */
                        vcons_init_screen(&sc->vd, &chipsfb_console_screen, 1,
                            &defattr);
                } else
                        (*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);

                glyphcache_init(&sc->sc_gc, sc->sc_height + 1,
                                (sc->sc_fbsize / sc->sc_linebytes) - sc->sc_height - 1,
                                sc->sc_width,
                                ri->ri_font->fontwidth,
                                ri->ri_font->fontheight,
                                defattr);
        }

        rasops_unpack_attr(defattr, &fg, &bg, &ul);
        sc->sc_bg = ri->ri_devcmap[bg];
        chipsfb_clearscreen(sc);

        if (console)
                vcons_replay_msgbuf(&chipsfb_console_screen);

        aprint_normal_dev(sc->sc_dev, "%d MB aperture, %d MB VRAM at 0x%08x\n",
            (u_int)(sc->sc_fbsize >> 20),
            (int)sc->memsize >> 20, (u_int)sc->sc_fb);
#ifdef CHIPSFB_DEBUG
        aprint_debug("fb: %08lx\n", (ulong)ri->ri_bits);
#endif

        j = 0;
        rasops_get_cmap(ri, cmap, sizeof(cmap));
        for (i = 0; i < 256; i++) {
                chipsfb_putpalreg(sc, i, cmap[j], cmap[j + 1], cmap[j + 2]);
                j += 3;
        }
        
        aa.console = console;
        aa.scrdata = &chipsfb_screenlist;
        aa.accessops = &chipsfb_accessops;
        aa.accesscookie = &sc->vd;

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

static int
chipsfb_putpalreg(struct chipsfb_softc *sc, uint8_t index, uint8_t r,
    uint8_t g, uint8_t b)
{

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

        chipsfb_write_vga(sc, CT_DACMASK, 0xff);
        chipsfb_write_vga(sc, CT_WRITEINDEX, index);
        chipsfb_write_vga(sc, CT_DACDATA, r);
        chipsfb_write_vga(sc, CT_DACDATA, g);
        chipsfb_write_vga(sc, CT_DACDATA, b);

        return 0;
}

static int
chipsfb_putcmap(struct chipsfb_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 CHIPSFB_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++) {
                chipsfb_putpalreg(sc, index, *r, *g, *b);
                index++;
                r++, g++, b++;
        }
        return 0;
}

static int
chipsfb_getcmap(struct chipsfb_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
chipsfb_clearscreen(struct chipsfb_softc *sc)
{
        chipsfb_rectfill(sc, 0, 0, sc->sc_width, sc->sc_height, sc->sc_bg);
}

/*
 * wsdisplay_emulops
 */

static void
chipsfb_cursor(void *cookie, int on, int row, int col)
{
        struct rasops_info *ri = cookie;
        struct vcons_screen *scr = ri->ri_hw;
        struct chipsfb_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) {
                        chipsfb_bitblt(sc, x, y, x, y, wi, he, ROP_NOT_DST);
                        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;
                        chipsfb_bitblt(sc, x, y, x, y, wi, he, ROP_NOT_DST);
                        ri->ri_flg |= RI_CURSOR;
                }
        } else {
                ri->ri_flg &= ~RI_CURSOR;
                ri->ri_crow = row;
                ri->ri_ccol = col;
        }
}

#if 0
int
chipsfb_mapchar(void *cookie, int uni, u_int *index)
{
        return 0;
}
#endif

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

        if (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;
                chipsfb_bitblt(sc, xs, y, xd, y, width, height, ROP_COPY);
        }
}

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

        if (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);

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

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

        if (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;
                chipsfb_bitblt(sc, x, ys, x, yd, width, height, ROP_COPY);
        }
}

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

        if (sc->sc_mode == WSDISPLAYIO_MODE_EMUL) {
                rasops_unpack_attr(fillattr, &fg, &bg, &ul);
                if ((row == 0) && (nrows == ri->ri_rows)) {
                        /* clear the whole screen */
                        chipsfb_rectfill(sc, 0, 0, ri->ri_width,
                            ri->ri_height, ri->ri_devcmap[bg]);
                } else {
                        x = ri->ri_xorigin;
                        y = ri->ri_yorigin + ri->ri_font->fontheight * row;
                        width = ri->ri_emuwidth;
                        height = ri->ri_font->fontheight * nrows;
                        chipsfb_rectfill(sc, x, y, width, height,
                            ri->ri_devcmap[bg]);
                }
        }
}

static void
chipsfb_bitblt(void *cookie, int xs, int ys, int xd, int yd,
    int width, int height, int rop)
{
        struct chipsfb_softc *sc = cookie;
        uint32_t src, dst, cmd = rop, stride, size;

        cmd |= BLT_PAT_IS_SOLID;

        /* we assume 8 bit for now */
        src = xs + ys * sc->sc_linebytes;
        dst = xd + yd * sc->sc_linebytes;

        if (xs < xd) {
                /* right-to-left operation */
                cmd |= BLT_START_RIGHT;
                src += width - 1;
                dst += width - 1;
        }

        if (ys < yd) {
                /* bottom-to-top operation */
                cmd |= BLT_START_BOTTOM;
                src += (height - 1) * sc->sc_linebytes;
                dst += (height - 1) * sc->sc_linebytes;
        }

        stride = (sc->sc_linebytes << 16) | sc->sc_linebytes;
        size = (height << 16) | width;

        chipsfb_wait_idle(sc);
        chipsfb_write32(sc, CT_BLT_STRIDE, stride);
        chipsfb_write32(sc, CT_BLT_SRCADDR, src);
        chipsfb_write32(sc, CT_BLT_DSTADDR, dst);
        chipsfb_write32(sc, CT_BLT_CONTROL, cmd);
        chipsfb_write32(sc, CT_BLT_SIZE, size);
#ifdef CHIPSFB_WAIT
        chipsfb_wait_idle(sc);
#endif
}

static void
chipsfb_rectfill(struct chipsfb_softc *sc, int x, int y, int width,
    int height, int colour)
{
        uint32_t dst, cmd, stride, size;

        cmd = BLT_PAT_IS_SOLID | BLT_PAT_IS_MONO | ROP_PAT;

        /* we assume 8 bit for now */
        dst = x + y * sc->sc_linebytes;

        stride = (sc->sc_linebytes << 16) | sc->sc_linebytes;
        size = (height << 16) | width;

        chipsfb_wait_idle(sc);
        chipsfb_write32(sc, CT_BLT_STRIDE, stride);
        chipsfb_write32(sc, CT_BLT_SRCADDR, dst);
        chipsfb_write32(sc, CT_BLT_DSTADDR, dst);
        chipsfb_write32(sc, CT_BLT_CONTROL, cmd);
        chipsfb_write32(sc, CT_BLT_BG, colour);
        chipsfb_write32(sc, CT_BLT_FG, colour);
        chipsfb_write32(sc, CT_BLT_SIZE, size);
#ifdef CHIPSFB_WAIT
        chipsfb_wait_idle(sc);
#endif
}

static void
chipsfb_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 chipsfb_softc *sc = scr->scr_cookie;
        uint32_t bg, latch = 0, bg8, fg8, pixel, dst, stride, size;
        int i, l, x, y, wi, he, r, g, b, aval;
        int r1, g1, b1, r0, g0, b0, fgo, bgo, off, pad;
        uint8_t *data8;
        int rv;

        if (__predict_false((unsigned int)row > ri->ri_rows ||
            (unsigned int)col > ri->ri_cols))
                return;

        if (__predict_false((sc->sc_mode != WSDISPLAYIO_MODE_EMUL)))
                return;
        
        if (__predict_false((!CHAR_IN_FONT(c, font))))
                return;

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

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

        if (c == 0x20) {
                chipsfb_rectfill(sc, x, y, wi, he, bg);
                return;
        }

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

        data8 = WSFONT_GLYPH(c, font);

        /* we assume 8 bit for now */
        dst = x + y * sc->sc_linebytes;

        stride = sc->sc_linebytes << 16;
        size = (he << 16) | wi;

        /* set up for host blit */
        chipsfb_wait_idle(sc);
        chipsfb_write32(sc, CT_BLT_STRIDE, stride);
        chipsfb_write32(sc, CT_BLT_DSTADDR, dst);
        chipsfb_write32(sc, CT_BLT_SRCADDR, 0);
        chipsfb_write32(sc, CT_BLT_CONTROL,
            BLT_PAT_IS_SOLID | BLT_SRC_IS_CPU | ROP_COPY);
        chipsfb_write32(sc, CT_BLT_SIZE, size);

        /*
         * 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);

        /* see if we need to pad lines to 64bit */
        pad = (wi + 3) & 4;
        for (l = 0; l < he; l++) {
                off = 0;
                latch = 0;
                for (i = 0; i < wi; i++) {
                        aval = *data8;
                        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 |= pixel << off;
                        off += 8;
                        /* write in 32bit chunks */
                        if ((i & 3) == 3) {
                                chipsfb_write32(sc,
                                    CT_OFF_DATA - CT_OFF_BITBLT, latch);
                                latch = 0;
                                off = 0;
                        }
                        data8++;
                }
                /* if we have pixels left in latch write them out */
                if ((i & 3) != 0) {
                        chipsfb_write32(sc, CT_OFF_DATA - CT_OFF_BITBLT, latch);
                }
                /* this chip needs scanlines 64bit aligned */
                if (pad) chipsfb_write32(sc, CT_OFF_DATA - CT_OFF_BITBLT, 0);
        }

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

static void
chipsfb_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 chipsfb_softc *sc = scr->scr_cookie;

        if (__predict_false((unsigned int)row > ri->ri_rows ||
            (unsigned int)col > ri->ri_cols))
                return;

        if (sc->sc_mode == WSDISPLAYIO_MODE_EMUL) {
                uint8_t *data;
                int fg, bg, uc;
                int x, y, wi, he;

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

                if (!CHAR_IN_FONT(c, font))
                        return;
                bg = (u_char)ri->ri_devcmap[(attr >> 16) & 0xf];
                fg = (u_char)ri->ri_devcmap[(attr >> 24) & 0xf];
                x = ri->ri_xorigin + col * wi;
                y = ri->ri_yorigin + row * he;
                if (c == 0x20) {
                        chipsfb_rectfill(sc, x, y, wi, he, bg);
                } else {
                        uc = c - font->firstchar;
                        data = (uint8_t *)font->data + uc *
                            ri->ri_fontscale;
                        chipsfb_setup_mono(sc, x, y, wi, he, fg, bg);
                        chipsfb_feed(sc, font->stride * he, data);
                }
        }
}

static void
chipsfb_setup_mono(struct chipsfb_softc *sc, int xd, int yd, int width,
    int height, uint32_t fg, uint32_t bg)
{
        uint32_t dst, cmd, stride, size;

        cmd = BLT_PAT_IS_SOLID | BLT_SRC_IS_CPU | BLT_SRC_IS_MONO | ROP_COPY;

        /* we assume 8 bit for now */
        dst = xd + yd * sc->sc_linebytes;

        stride = (sc->sc_linebytes << 16);
        size = (height << 16) | width;

        chipsfb_wait_idle(sc);
        chipsfb_write32(sc, CT_BLT_STRIDE, stride);
        chipsfb_write32(sc, CT_BLT_DSTADDR, dst);
        chipsfb_write32(sc, CT_BLT_SRCADDR, 0);
        chipsfb_write32(sc, CT_BLT_CONTROL, cmd);
        chipsfb_write32(sc, CT_BLT_BG, bg);
        chipsfb_write32(sc, CT_BLT_FG, fg);
        chipsfb_write32(sc, CT_BLT_SIZE, size);
}

static void
chipsfb_feed(struct chipsfb_softc *sc, int count, uint8_t *data)
{
        int i;
        uint32_t latch = 0, bork;
        int shift = 0;

        for (i = 0; i < count; i++) {
                bork = data[i];
                latch |= (bork << shift);
                if (shift == 24) {
                        chipsfb_write32(sc, CT_OFF_DATA - CT_OFF_BITBLT, latch);
                        latch = 0;
                        shift = 0;
                } else
                        shift += 8;
        }

        if (shift != 0) {
                chipsfb_write32(sc, CT_OFF_DATA - CT_OFF_BITBLT, latch);
        }

        /* apparently the chip wants 64bit-aligned data or it won't go idle */
        if ((count + 3) & 0x04) {
                chipsfb_write32(sc, CT_OFF_DATA - CT_OFF_BITBLT, 0);
        }
#ifdef CHIPSFB_WAIT
        chipsfb_wait_idle(sc);
#endif
}

#if 0
static void
chipsfb_showpal(struct chipsfb_softc *sc)
{
        int i, x = 0;

        for (i = 0; i < 16; i++) {
                chipsfb_rectfill(sc, x, 0, 64, 64, i);
                x += 64;
        }
}
#endif

#if 0
static int
chipsfb_allocattr(void *cookie, int fg, int bg, int flags, long *attrp)
{

        return 0;
}
#endif

static void
chipsfb_restore_palette(struct chipsfb_softc *sc)
{
        int i;

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

/*
 * wsdisplay_accessops
 */

static int
chipsfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
        struct lwp *l)
{
        struct vcons_data *vd = v;
        struct chipsfb_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;

        case WSDISPLAYIO_GINFO:
                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 chipsfb_getcmap(sc,
                    (struct wsdisplay_cmap *)data);

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


        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) {
                                chipsfb_init(sc);
                                chipsfb_restore_palette(sc);
                                glyphcache_wipe(&sc->sc_gc);
                                vcons_redraw_screen(ms);
                        }
                }
                }
                return 0;
        
        case WSDISPLAYIO_GET_FBINFO: {
                struct wsdisplayio_fbinfo *fbi = data;
                return wsdisplayio_get_fbinfo(&ms->scr_ri, fbi);
        }

        default:
                if (sc->sc_ioctl != NULL)
                        return sc->sc_ioctl(v, vs, cmd, data, flag, l);
        }
        return EPASSTHROUGH;
}

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

        if (sc->sc_mmap != NULL) {
                pa = sc->sc_mmap(v, vs, offset, prot);
                if (pa != -1) return pa;
        }

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

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

#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
chipsfb_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
        struct chipsfb_softc *sc = cookie;
        struct rasops_info *ri = &scr->scr_ri;

        ri->ri_depth = sc->sc_bits_per_pixel;
        ri->ri_width = sc->sc_width;
        ri->ri_height = sc->sc_height;
        ri->ri_stride = sc->sc_width;
        ri->ri_flg = RI_CENTER | RI_FULLCLEAR |
                     RI_8BIT_IS_RGB | RI_ENABLE_ALPHA;

        ri->ri_bits = bus_space_vaddr(sc->sc_memt, sc->sc_fbh);

#ifdef CHIPSFB_DEBUG
        aprint_debug("addr: %08lx\n", (ulong)ri->ri_bits);
#endif
        if (existing) {
                ri->ri_flg |= RI_CLEAR;
        }

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

        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 = chipsfb_copyrows;
        ri->ri_ops.copycols = chipsfb_copycols;
        ri->ri_ops.eraserows = chipsfb_eraserows;
        ri->ri_ops.erasecols = chipsfb_erasecols;
        ri->ri_ops.cursor = chipsfb_cursor;
        if (FONT_IS_ALPHA(ri->ri_font)) {
                ri->ri_ops.putchar = chipsfb_putchar_aa;
        } else
                ri->ri_ops.putchar = chipsfb_putchar;
}

#if 0
int
chipsfb_load_font(void *v, void *cookie, struct wsdisplay_font *data)
{

        return 0;
}
#endif

static void
chipsfb_init(struct chipsfb_softc *sc)
{
        uint8_t reg;

        chipsfb_wait_idle(sc);

        /* setup the blitter */
        chipsfb_write32(sc, CT_BLT_EXPCTL, MONO_SRC_ALIGN_BYTE);

        /* put DAC into 8bit mode */
        reg = chipsfb_read_indexed(sc, CT_CONF_INDEX, XR_PIXEL_PIPELINE_CTL_0);
        reg |= ENABLE_8BIT_DAC;
        chipsfb_write_indexed(sc, CT_CONF_INDEX, XR_PIXEL_PIPELINE_CTL_0, reg);
}

uint32_t
chipsfb_probe_vram(struct chipsfb_softc *sc)
{
        uint32_t ofs = 0x00080000;      /* 512kB */

        /*
         * advance in 0.5MB steps, see if we can read back what we wrote and
         * if what we wrote to 0 is left untouched. Max. fb size is 4MB so
         * we voluntarily stop there.
         */
        bus_space_write_4(sc->sc_memt, sc->sc_fbh, 0, 0xf0f0f0f0);
        bus_space_write_4(sc->sc_memt, sc->sc_fbh, ofs, 0x0f0f0f0f);
        while ((bus_space_read_4(sc->sc_memt, sc->sc_fbh, 0) == 0xf0f0f0f0) &&
            (bus_space_read_4(sc->sc_memt, sc->sc_fbh, ofs) == 0x0f0f0f0f) &&
            (ofs < 0x00400000)) {

                ofs += 0x00080000;
                bus_space_write_4(sc->sc_memt, sc->sc_fbh, ofs, 0x0f0f0f0f);
        }

        return ofs;
}