sys/dev/sbus/agten.c

root/sys/dev/sbus/agten.c
/*      $NetBSD: agten.c,v 1.34 2021/08/07 16:19:15 thorpej Exp $ */

/*-
 * Copyright (c) 2007 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: agten.c,v 1.34 2021/08/07 16:19:15 thorpej Exp $");

/*
 * a driver for the Fujitsu AG-10e SBus framebuffer
 *
 * this thing is Frankenstein's Monster among graphics boards.
 * it contains three graphics chips:
 * a GLint 300SX - 24bit stuff, double-buffered
 * an Imagine 128 which provides an 8bit overlay
 * a Weitek P9100 which provides WIDs
 * so here we need to mess only with the P9100 and the I128 - for X we just
 * hide the overlay and let the Xserver mess with the GLint
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/mutex.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/conf.h>

#include <dev/sun/fbio.h>
#include <dev/sun/fbvar.h>
#include <dev/sun/btreg.h>
#include <dev/sun/btvar.h>

#include <sys/bus.h>
#include <machine/autoconf.h>

#include <dev/sbus/sbusvar.h>

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

#include <dev/wscons/wsdisplay_vconsvar.h>
#include <dev/wscons/wsdisplay_glyphcachevar.h>

#include <dev/sbus/p9100reg.h>
#include <dev/ic/ibm561reg.h>
#include <dev/ic/i128reg.h>
#include <dev/ic/i128var.h>

#include "opt_agten.h"
#include "ioconf.h"

static int      agten_match(device_t, cfdata_t, void *);
static void     agten_attach(device_t, device_t, void *);

static int      agten_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t  agten_mmap(void *, void *, off_t, int);
static void     agten_init_screen(void *, struct vcons_screen *, int, long *);

struct agten_softc {
        device_t        sc_dev;         /* base device */
        struct fbdevice sc_fb;          /* frame buffer device */

        struct vcons_screen sc_console_screen;
        struct wsscreen_descr sc_defaultscreen_descr;
        const struct wsscreen_descr *sc_screens[1];
        struct wsscreen_list sc_screenlist;

        bus_space_tag_t sc_bustag;

        bus_space_handle_t      sc_i128_fbh;
        bus_size_t              sc_i128_fbsz;
        bus_space_handle_t      sc_i128_regh;
        bus_space_handle_t      sc_p9100_regh;
        bus_addr_t              sc_glint_fb;
        bus_addr_t              sc_glint_regs;
        uint32_t                sc_glint_fbsz;

        uint32_t        sc_width;
        uint32_t        sc_height;      /* panel width / height */
        uint32_t        sc_stride;
        uint32_t        sc_depth;

        int sc_cursor_x;
        int sc_cursor_y;
        int sc_video;                   /* video output enabled */

        /* some /dev/fb* stuff */
        int sc_fb_is_open;

        union   bt_cmap sc_cmap;        /* Brooktree color map */

        int sc_mode;
        uint32_t sc_bg;

        void (*sc_putchar)(void *, int, int, u_int, long);

        struct vcons_data vd;
        glyphcache sc_gc;
};

CFATTACH_DECL_NEW(agten, sizeof(struct agten_softc),
    agten_match, agten_attach, NULL, NULL);


static int      agten_putcmap(struct agten_softc *, struct wsdisplay_cmap *);
static int      agten_getcmap(struct agten_softc *, struct wsdisplay_cmap *);
static int      agten_putpalreg(struct agten_softc *, uint8_t, uint8_t,
                            uint8_t, uint8_t);
static void     agten_init(struct agten_softc *);
static void     agten_init_cmap(struct agten_softc *, struct rasops_info *);
static void     agten_gfx(struct agten_softc *);
static void     agten_set_video(struct agten_softc *, int);
static int      agten_get_video(struct agten_softc *);

static void     agten_bitblt(void *, int, int, int, int, int, int, int);
static void     agten_rectfill(void *, int, int, int, int, long);

static void     agten_putchar(void *, int, int, u_int, long);
static void     agten_cursor(void *, int, int, int);
static void     agten_copycols(void *, int, int, int, int);
static void     agten_erasecols(void *, int, int, int, long);
static void     agten_copyrows(void *, int, int, int);
static void     agten_eraserows(void *, int, int, long);

static void     agten_move_cursor(struct agten_softc *, int, int);
static int      agten_do_cursor(struct agten_softc *sc,
                                struct wsdisplay_cursor *);
static int      agten_do_sun_cursor(struct agten_softc *sc,
                                struct fbcursor *);

static uint16_t util_interleave(uint8_t, uint8_t);
static uint16_t util_interleave_lin(uint8_t, uint8_t);

extern const u_char rasops_cmap[768];

struct wsdisplay_accessops agten_accessops = {
        agten_ioctl,
        agten_mmap,
        NULL,   /* alloc_screen */
        NULL,   /* free_screen */
        NULL,   /* show_screen */
        NULL,   /* load_font */
        NULL,   /* pollc */
        NULL    /* scroll */
};

/* /dev/fb* stuff */

static int agten_fb_open(dev_t, int, int, struct lwp *);
static int agten_fb_close(dev_t, int, int, struct lwp *);
static int agten_fb_ioctl(dev_t, u_long, void *, int, struct lwp *);
static paddr_t agten_fb_mmap(dev_t, off_t, int);
static void agten_fb_unblank(device_t);

static struct fbdriver agtenfbdriver = {
        agten_fb_unblank, agten_fb_open, agten_fb_close, agten_fb_ioctl,
        nopoll, agten_fb_mmap, nokqfilter
};

static inline void
agten_write_dac(struct agten_softc *sc, int reg, uint8_t val)
{
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh,
            0x200 + (reg << 2), (uint32_t)val << 16);
}

static inline void
agten_write_idx(struct agten_softc *sc, int offset)
{
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh,
            0x200 + (IBM561_ADDR_LOW << 2), (offset & 0xff) << 16);
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh,
            0x200 + (IBM561_ADDR_HIGH << 2), ((offset >> 8) & 0xff) << 16);
}

static inline void
agten_write_dac_10(struct agten_softc *sc, int reg, uint16_t val)
{
        agten_write_dac(sc, reg, (val >> 2) & 0xff);
        agten_write_dac(sc, reg, (val & 0x3) << 6);
}
        
static int
agten_match(device_t dev, cfdata_t cf, void *aux)
{
        struct sbus_attach_args *sa = aux;

        if (strcmp("PFU,aga", sa->sa_name) == 0)
                return 100;
        return 0;
}

static void
agten_attach(device_t parent, device_t dev, void *aux)
{
        struct agten_softc *sc = device_private(dev);
        struct sbus_attach_args *sa = aux;
        struct fbdevice *fb = &sc->sc_fb;
        struct wsemuldisplaydev_attach_args aa;
        struct rasops_info *ri;
        long defattr;
        uint32_t reg;
        int node = sa->sa_node;
        int console;
 
        sc->sc_dev = dev;
        sc->sc_defaultscreen_descr = (struct wsscreen_descr){
                "default",
                0, 0,
                NULL,
                8, 16,
                WSSCREEN_WSCOLORS | WSSCREEN_HILIT,
                NULL
        };
        sc->sc_screens[0] = &sc->sc_defaultscreen_descr;
        sc->sc_screenlist = (struct wsscreen_list){1, sc->sc_screens};
        sc->sc_mode = WSDISPLAYIO_MODE_EMUL;
        sc->sc_fb_is_open = 0;
        sc->sc_video = -1;
        sc->sc_bustag = sa->sa_bustag;
        sc->sc_putchar = NULL;

        sc->sc_width = prom_getpropint(node, "ffb_width", 1152);
        sc->sc_height = prom_getpropint(node, "ffb_height", 900);
        sc->sc_depth = prom_getpropint(node, "ffb_depth", 8);
        sc->sc_stride = sc->sc_width * (sc->sc_depth >> 3);

        reg = prom_getpropint(node, "i128_fb_physaddr", -1);
        sc->sc_i128_fbsz = prom_getpropint(node, "i128_fb_size", -1);
        if (sbus_bus_map(sc->sc_bustag,
            sa->sa_reg[0].oa_space, sa->sa_reg[0].oa_base + reg,
            round_page(sc->sc_stride * sc->sc_height),
            BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_LARGE, 
            &sc->sc_i128_fbh) != 0) {

                aprint_error_dev(dev, "unable to map the framebuffer\n");
                return;
        }
        fb->fb_pixels = bus_space_vaddr(sc->sc_bustag, sc->sc_i128_fbh);

        reg = prom_getpropint(node, "i128_reg_physaddr", -1);
        if (sbus_bus_map(sc->sc_bustag,
            sa->sa_reg[0].oa_space, sa->sa_reg[0].oa_base + reg,
            0x10000, 0, &sc->sc_i128_regh) != 0) {

                aprint_error_dev(dev, "unable to map I128 registers\n");
                return;
        }

        reg = prom_getpropint(node, "p9100_reg_physaddr", -1);
        if (sbus_bus_map(sc->sc_bustag,
            sa->sa_reg[0].oa_space, sa->sa_reg[0].oa_base + reg,
            0x8000, 0, &sc->sc_p9100_regh) != 0) {

                aprint_error_dev(dev, "unable to map P9100 registers\n");
                return;
        }

        reg = prom_getpropint(node, "glint_fb0_physaddr", -1);
        sc->sc_glint_fb = sbus_bus_addr(sc->sc_bustag,
            sa->sa_reg[0].oa_space, sa->sa_reg[0].oa_base + reg);
        sc->sc_glint_fbsz = prom_getpropint(node, "glint_lb_size", -1);
        reg = prom_getpropint(node, "glint_reg_physaddr", -1);
        sc->sc_glint_regs = sbus_bus_addr(sc->sc_bustag,
            sa->sa_reg[0].oa_space, sa->sa_reg[0].oa_base + reg);

#if 0
        bus_intr_establish(sc->sc_bustag, sa->sa_pri, IPL_BIO,
            agten_intr, sc);
#endif

        printf(": %dx%d\n", sc->sc_width, sc->sc_height);
        agten_init(sc);

        console = fb_is_console(node);

        vcons_init(&sc->vd, sc, &sc->sc_defaultscreen_descr,
            &agten_accessops);
        sc->vd.init_screen = agten_init_screen;

        ri = &sc->sc_console_screen.scr_ri;

        sc->sc_gc.gc_bitblt = agten_bitblt;
        sc->sc_gc.gc_rectfill = agten_rectfill;
        sc->sc_gc.gc_blitcookie = sc;
        sc->sc_gc.gc_rop = CR_COPY;

#if defined(AGTEN_DEBUG)
        sc->sc_height -= 200;
#endif

        if (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;
                glyphcache_init(&sc->sc_gc,
                    sc->sc_height + 5,
                    (0x400000 / sc->sc_stride) - sc->sc_height - 5,
                    sc->sc_width,
                    ri->ri_font->fontwidth,
                    ri->ri_font->fontheight,
                    defattr);

                wsdisplay_cnattach(&sc->sc_defaultscreen_descr, ri, 0, 0,
                    defattr);
                i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, 0, 0,
                    sc->sc_width, sc->sc_height,
                    ri->ri_devcmap[(defattr >> 16) & 0xff]);
                vcons_replay_msgbuf(&sc->sc_console_screen);
        } else {
                /*
                 * since we're not the console we can postpone the rest
                 * until someone actually allocates a screen for us
                 */
                if (sc->sc_console_screen.scr_ri.ri_rows == 0) {
                        /* do some minimal setup to avoid weirdnesses later */
                        vcons_init_screen(&sc->vd, &sc->sc_console_screen, 1,
                            &defattr);
                } else
                        (*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);

                glyphcache_init(&sc->sc_gc,
                    sc->sc_height + 5,
                    (0x400000 / sc->sc_stride) - sc->sc_height - 5,
                    sc->sc_width,
                    ri->ri_font->fontwidth,
                    ri->ri_font->fontheight,
                    defattr);
        }

        /* Initialize the default color map. */
        agten_init_cmap(sc, ri);

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

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

        fb->fb_driver = &agtenfbdriver;
        fb->fb_device = sc->sc_dev;
        fb->fb_flags = device_cfdata(sc->sc_dev)->cf_flags & FB_USERMASK;
        fb->fb_type.fb_type = FBTYPE_AG10E;
        fb->fb_type.fb_cmsize = 256;    /* doesn't matter, we're always 24bit */
        fb->fb_type.fb_size = sc->sc_glint_fbsz;
        fb->fb_type.fb_width = sc->sc_width;
        fb->fb_type.fb_height = sc->sc_height;
        fb->fb_type.fb_depth = 32;
        fb->fb_linebytes = sc->sc_stride << 2;
        fb_attach(fb, console);
        agten_set_video(sc, 1); /* make sure video's on */
}

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

        switch (cmd) {

                case WSDISPLAYIO_GTYPE:
                        *(u_int *)data = WSDISPLAY_TYPE_AG10;
                        return 0;

                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_GVIDEO:
                        *(int *)data = sc->sc_video;
                        return 0;

                case WSDISPLAYIO_SVIDEO:
                        agten_set_video(sc, *(int *)data);
                        return 0;

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

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

                case WSDISPLAYIO_LINEBYTES:
                        *(u_int *)data = sc->sc_stride << 2;
                        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) {
                                                agten_init(sc);
                                                agten_init_cmap(sc,
                                                    &ms->scr_ri);
                                                vcons_redraw_screen(ms);
                                        } else {
                                                agten_gfx(sc);
                                        }
                                }
                        }
                        return 0;

                case WSDISPLAYIO_GCURPOS:
                        {
                                struct wsdisplay_curpos *cp = (void *)data;

                                cp->x = sc->sc_cursor_x;
                                cp->y = sc->sc_cursor_y;
                        }
                        return 0;

                case WSDISPLAYIO_SCURPOS:
                        {
                                struct wsdisplay_curpos *cp = (void *)data;

                                agten_move_cursor(sc, cp->x, cp->y);
                        }
                        return 0;

                case WSDISPLAYIO_GCURMAX:
                        {
                                struct wsdisplay_curpos *cp = (void *)data;

                                cp->x = 64;
                                cp->y = 64;
                        }
                        return 0;

                case WSDISPLAYIO_SCURSOR:
                        {
                                struct wsdisplay_cursor *cursor = (void *)data;

                                return agten_do_cursor(sc, cursor);
                        }
        }
        return EPASSTHROUGH;
}

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

        if (offset < sc->sc_glint_fbsz)
                return bus_space_mmap(sc->sc_bustag, sc->sc_glint_fb, offset,
                    prot, BUS_SPACE_MAP_LINEAR);
        return -1;
}

static void
agten_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
        struct agten_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_8BIT_IS_RGB | RI_ENABLE_ALPHA;

        ri->ri_bits = (char *)sc->sc_fb.fb_pixels;

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

        rasops_init(ri, 0, 0);
        sc->sc_putchar = ri->ri_ops.putchar;

        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.putchar   = agten_putchar;
        ri->ri_ops.cursor    = agten_cursor;
        ri->ri_ops.copyrows  = agten_copyrows;
        ri->ri_ops.eraserows = agten_eraserows;
        ri->ri_ops.copycols  = agten_copycols;
        ri->ri_ops.erasecols = agten_erasecols;

}

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

        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;

        r = &rbuf[index];
        g = &gbuf[index];
        b = &bbuf[index];

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

static int
agten_getcmap(struct agten_softc *sc, struct wsdisplay_cmap *cm)
{
        u_int index = cm->index;
        u_int count = cm->count;
        int error, i;
        uint8_t red[256], green[256], blue[256];

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

        i = index;
        while (i < (index + count)) {
                red[i] = sc->sc_cmap.cm_map[i][0];
                green[i] = sc->sc_cmap.cm_map[i][1];
                blue[i] = sc->sc_cmap.cm_map[i][2];
                i++;
        }
        error = copyout(&red[index],   cm->red,   count);
        if (error)
                return error;
        error = copyout(&green[index], cm->green, count);
        if (error)
                return error;
        error = copyout(&blue[index],  cm->blue,  count);
        if (error)
                return error;

        return 0;
}

static int
agten_putpalreg(struct agten_softc *sc, uint8_t idx, uint8_t r, uint8_t g,
    uint8_t b)
{

        sc->sc_cmap.cm_map[idx][0] = r;
        sc->sc_cmap.cm_map[idx][1] = g;
        sc->sc_cmap.cm_map[idx][2] = b;
        agten_write_idx(sc, IBM561_CMAP_TABLE + idx);
        agten_write_dac(sc, IBM561_CMD_CMAP, r);
        agten_write_dac(sc, IBM561_CMD_CMAP, g);
        agten_write_dac(sc, IBM561_CMD_CMAP, b);
        return 0;
}

static void
agten_init(struct agten_softc *sc)
{
        int i;
        uint32_t src, srcw;

        /* then we set up a linear LUT for 24bit colour */
        agten_write_idx(sc, IBM561_CMAP_TABLE + 256);
        for (i = 0; i < 256; i++) {
                agten_write_dac(sc, IBM561_CMD_CMAP, i);
                agten_write_dac(sc, IBM561_CMD_CMAP, i);
                agten_write_dac(sc, IBM561_CMD_CMAP, i);
        }
        
        /* and the linear gamma maps */
        agten_write_idx(sc, IBM561_RED_GAMMA_TABLE);
        for (i = 0; i < 0x3ff; i+= 4)
                agten_write_dac_10(sc, IBM561_CMD_GAMMA, i);
        agten_write_idx(sc, IBM561_GREEN_GAMMA_TABLE);
        for (i = 0; i < 0x3ff; i+= 4)
                agten_write_dac_10(sc, IBM561_CMD_GAMMA, i);
        agten_write_idx(sc, IBM561_BLUE_GAMMA_TABLE);
        for (i = 0; i < 0x3ff; i+= 4)
                agten_write_dac_10(sc, IBM561_CMD_GAMMA, i);

        /* enable outputs, RGB mode */
        agten_write_idx(sc, IBM561_CONFIG_REG3);
        agten_write_dac(sc, IBM561_CMD, CR3_SERIAL_CLK_CTRL | CR3_RGB);

        /* MUX 4:1 basic, 8bit overlay, 8bit WIDs */
        agten_write_idx(sc, IBM561_CONFIG_REG1);
        agten_write_dac(sc, IBM561_CMD, CR1_MODE_4_1_BASIC | CR1_OVL_8BPP | 
            CR1_WID_8);

        /* use external clock, enable video output */
        agten_write_idx(sc, IBM561_CONFIG_REG2);
        agten_write_dac(sc, IBM561_CMD, CR2_ENABLE_CLC | CR2_PLL_REF_SELECT |
            CR2_PIXEL_CLOCK_SELECT | CR2_ENABLE_RGB_OUTPUT);

        /* now set up some window attributes */
        
        /* 
         * direct colour, 24 bit, transparency off, LUT from 0x100
         * we need to use direct colour and a linear LUT because for some
         * reason true color mode gives messed up colours
         */
        agten_write_idx(sc, IBM561_FB_WINTYPE);
        agten_write_dac_10(sc, IBM561_CMD_FB_WAT, 0x100 | FB_PIXEL_24BIT | 
            FB_MODE_DIRECT);

        /* use gamma LUTs, no crosshair, 0 is transparent */
        agten_write_idx(sc, IBM561_AUXFB_WINTYPE);
        agten_write_dac(sc, IBM561_CMD_FB_WAT, 0x0);    

        /* overlay is 8 bit, opaque */
        agten_write_idx(sc, IBM561_OL_WINTYPE);
        agten_write_dac_10(sc, IBM561_CMD_FB_WAT, 0x00);

        /* now we fill the WID fb with zeroes */
        src = 0;
        srcw = sc->sc_width << 16 | sc->sc_height;
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh, FOREGROUND_COLOR,
            0x0);
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh, BACKGROUND_COLOR,
            0x0);
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh, RASTER_OP, ROP_PAT);
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh, COORD_INDEX, 0);
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh, RECT_RTW_XY, src);
        bus_space_write_4(sc->sc_bustag, sc->sc_p9100_regh, RECT_RTW_XY, srcw);
        (void)bus_space_read_4(sc->sc_bustag, sc->sc_p9100_regh, COMMAND_QUAD);

        /* initialize the cursor registers */
        
        /* initialize the Imagine 128 */
        i128_init(sc->sc_bustag, sc->sc_i128_regh, sc->sc_stride, 8);
}

static void
agten_init_cmap(struct agten_softc *sc, struct rasops_info *ri)
{
        int i, j;
        uint8_t cmap[768];

        rasops_get_cmap(ri, cmap, 768);
        j = 0;
        for (i = 0; i < 256; i++) {

                agten_putpalreg(sc, i, cmap[j], cmap[j + 1], cmap[j + 2]);
                j += 3;
        }
}

static void
agten_gfx(struct agten_softc *sc)
{
        /* enable overlay transparency on colour 0x00 */
        agten_write_idx(sc, IBM561_OL_WINTYPE);
        agten_write_dac_10(sc, IBM561_CMD_FB_WAT, OL_MODE_TRANSP_ENABLE);

        /* then blit the overlay full of 0x00 */
        i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, 0, 0, sc->sc_width,
            sc->sc_height, 0);

        /* ... so we can see the 24bit framebuffer */   
}       

static void
agten_set_video(struct agten_softc *sc, int flag)
{
        uint8_t reg = 
            CR2_ENABLE_CLC | CR2_PLL_REF_SELECT | CR2_PIXEL_CLOCK_SELECT;

        if (flag == sc->sc_video)
                return;

        agten_write_idx(sc, IBM561_CONFIG_REG2);
        agten_write_dac(sc, IBM561_CMD, flag ? reg | CR2_ENABLE_RGB_OUTPUT :
            reg);

        sc->sc_video = flag;
}

static int
agten_get_video(struct agten_softc *sc)
{

        return sc->sc_video;
}

static void
agten_bitblt(void *cookie, int xs, int ys, int xd, int yd, int wi, int he,
             int rop)
{
        struct agten_softc *sc = cookie;

        i128_bitblt(sc->sc_bustag, sc->sc_i128_regh,
            xs, ys, xd, yd, wi, he, rop);
}
        
static void
agten_rectfill(void *cookie, int x, int y, int wi, int he, long fg)
{
        struct agten_softc *sc = cookie;
        struct vcons_screen *scr = sc->vd.active;
        uint32_t col;

        if (scr == NULL)
                return;
        col = scr->scr_ri.ri_devcmap[fg];
        i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, x, y, wi, he, col);      
}

static void
agten_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 agten_softc *sc = scr->scr_cookie;
        uint32_t fg, bg;
        int x, y, wi, he, rv;

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

        bg = ri->ri_devcmap[(attr >> 16) & 0xf];
        fg = ri->ri_devcmap[(attr >> 24) & 0xf];

        x = ri->ri_xorigin + col * wi;
        y = ri->ri_yorigin + row * he;

        if (c == 0x20) {
                i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, x, y, wi, he,
                    bg);
                if (attr & 1)
                        i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, x,
                            y + he - 2, wi, 1, fg);
                return;
        }
        rv = glyphcache_try(&sc->sc_gc, c, x, y, attr);
        if (rv == GC_OK)
                return;
        i128_sync(sc->sc_bustag, sc->sc_i128_regh);
        sc->sc_putchar(cookie, row, col, c, attr & ~1);

        if (rv == GC_ADD) {
                glyphcache_add(&sc->sc_gc, c, x, y);
        } else {
                if (attr & 1)
                        i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, x,
                            y + he - 2, wi, 1, fg);
        }
}

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

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

        if (ri->ri_flg & RI_CURSOR) {
                x = ri->ri_ccol * wi + ri->ri_xorigin;
                y = ri->ri_crow * he + ri->ri_yorigin;
                i128_bitblt(sc->sc_bustag, sc->sc_i128_regh, x, y, x, y, wi, he,
                    CR_COPY_INV);
                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;
                i128_bitblt(sc->sc_bustag, sc->sc_i128_regh, x, y, x, y, wi, he,
                    CR_COPY_INV);
                ri->ri_flg |= RI_CURSOR;
        }
}

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

        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;
        i128_bitblt(sc->sc_bustag, sc->sc_i128_regh, xs, y, xd, y, width,
            height, CR_COPY);
}

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

        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;
        bg = (uint32_t)ri->ri_devcmap[(fillattr >> 16) & 0xff];
        i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, x, y, width, height, bg);
}

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

        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;
        i128_bitblt(sc->sc_bustag, sc->sc_i128_regh, x, ys, x, yd, width,
            height, CR_COPY);
}

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

        if ((row == 0) && (nrows == ri->ri_rows)) {
                x = y = 0;
                width = ri->ri_width;
                height = ri->ri_height;
        } else {
                x = ri->ri_xorigin;
                y = ri->ri_yorigin + ri->ri_font->fontheight * row;
                width = ri->ri_emuwidth;
                height = ri->ri_font->fontheight * nrows;
        }
        bg = (uint32_t)ri->ri_devcmap[(fillattr >> 16) & 0xff];
        i128_rectfill(sc->sc_bustag, sc->sc_i128_regh, x, y, width, height, bg);
}

static void
agten_move_cursor(struct agten_softc *sc, int x, int y)
{

        sc->sc_cursor_x = x;
        sc->sc_cursor_y = y;
        agten_write_idx(sc, IBM561_CURSOR_X_REG);
        agten_write_dac(sc, IBM561_CMD, x & 0xff);
        agten_write_dac(sc, IBM561_CMD, (x >> 8) & 0xff);
        agten_write_dac(sc, IBM561_CMD, y & 0xff);
        agten_write_dac(sc, IBM561_CMD, (y >> 8) & 0xff);
}

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

                agten_write_idx(sc, IBM561_CURS_CNTL_REG);
                agten_write_dac(sc, IBM561_CMD, cur->enable ?
                    CURS_ENABLE : 0);
        }
        if (cur->which & WSDISPLAY_CURSOR_DOHOT) {

                agten_write_idx(sc, IBM561_HOTSPOT_X_REG);
                agten_write_dac(sc, IBM561_CMD, cur->hot.x);
                agten_write_dac(sc, IBM561_CMD, cur->hot.y);
        }
        if (cur->which & WSDISPLAY_CURSOR_DOPOS) {

                agten_move_cursor(sc, cur->pos.x, cur->pos.y);
        }
        if (cur->which & WSDISPLAY_CURSOR_DOCMAP) {
                int i;
        
                agten_write_idx(sc, IBM561_CURSOR_LUT + cur->cmap.index + 2);
                for (i = 0; i < cur->cmap.count; i++) {
                        agten_write_dac(sc, IBM561_CMD_CMAP, cur->cmap.red[i]);
                        agten_write_dac(sc, IBM561_CMD_CMAP, 
                            cur->cmap.green[i]);
                        agten_write_dac(sc, IBM561_CMD_CMAP, cur->cmap.blue[i]);
                }
        }
        if (cur->which & WSDISPLAY_CURSOR_DOSHAPE) {
                int i;
                uint16_t tmp;

                agten_write_idx(sc, IBM561_CURSOR_BITMAP);
                for (i = 0; i < 512; i++) {
                        tmp = util_interleave(cur->mask[i], cur->image[i]);
                        agten_write_dac(sc, IBM561_CMD, (tmp >> 8) & 0xff);
                        agten_write_dac(sc, IBM561_CMD, tmp & 0xff);
                }
        }
        return 0;
}

static int
agten_do_sun_cursor(struct agten_softc *sc, struct fbcursor *cur)
{
        if (cur->set & FB_CUR_SETCUR) {

                agten_write_idx(sc, IBM561_CURS_CNTL_REG);
                agten_write_dac(sc, IBM561_CMD, cur->enable ?
                    CURS_ENABLE : 0);
        }
        if (cur->set & FB_CUR_SETHOT) {

                agten_write_idx(sc, IBM561_HOTSPOT_X_REG);
                agten_write_dac(sc, IBM561_CMD, cur->hot.x);
                agten_write_dac(sc, IBM561_CMD, cur->hot.y);
        }
        if (cur->set & FB_CUR_SETPOS) {

                agten_move_cursor(sc, cur->pos.x, cur->pos.y);
        }
        if (cur->set & FB_CUR_SETCMAP) {
                int i;
        
                agten_write_idx(sc, IBM561_CURSOR_LUT + cur->cmap.index + 2);
                for (i = 0; i < cur->cmap.count; i++) {
                        agten_write_dac(sc, IBM561_CMD_CMAP, cur->cmap.red[i]);
                        agten_write_dac(sc, IBM561_CMD_CMAP, 
                            cur->cmap.green[i]);
                        agten_write_dac(sc, IBM561_CMD_CMAP, cur->cmap.blue[i]);
                }
        }
        if (cur->set & FB_CUR_SETSHAPE) {
                int i;
                uint16_t tmp;

                agten_write_idx(sc, IBM561_CURSOR_BITMAP);
                for (i = 0; i < 512; i++) {
                        tmp = util_interleave_lin(cur->mask[i], cur->image[i]);
                        agten_write_dac(sc, IBM561_CMD, (tmp >> 8) & 0xff);
                        agten_write_dac(sc, IBM561_CMD, tmp & 0xff);
                }
        }
        return 0;
}

uint16_t
util_interleave(uint8_t b1, uint8_t b2)
{
        int i;
        uint16_t ret = 0;
        uint16_t mask = 0x8000;
        uint8_t mask8 = 0x01;

        for (i = 0; i < 8; i++) {
                if (b1 & mask8)
                        ret |= mask;
                mask = mask >> 1;
                if (b2 & mask8)
                        ret |= mask;
                mask = mask >> 1;
                mask8 = mask8 << 1;
        }
        return ret;
}

uint16_t
util_interleave_lin(uint8_t b1, uint8_t b2)
{
        int i;
        uint16_t ret = 0;
        uint16_t mask = 0x8000;
        uint8_t mask8 = 0x80;

        for (i = 0; i < 8; i++) {
                if (b1 & mask8)
                        ret |= mask;
                mask = mask >> 1;
                if (b2 & mask8)
                        ret |= mask;
                mask = mask >> 1;
                mask8 = mask8 >> 1;
        }
        return ret;
}

/* and now the /dev/fb* stuff */
static void
agten_fb_unblank(device_t dev)
{
        struct agten_softc *sc = device_private(dev);

        agten_init(sc);
        agten_set_video(sc, 1);
}

static int
agten_fb_open(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct agten_softc *sc;

        sc = device_lookup_private(&agten_cd, minor(dev));
        if (sc == NULL)
                return (ENXIO);
        if (sc->sc_fb_is_open)
                return 0;

        sc->sc_fb_is_open++;
        agten_gfx(sc);

        return (0);
}

static int
agten_fb_close(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct agten_softc *sc;

        sc = device_lookup_private(&agten_cd, minor(dev));

        sc->sc_fb_is_open--;
        if (sc->sc_fb_is_open < 0)
                sc->sc_fb_is_open = 0;

        if (sc->sc_fb_is_open == 0) {
                agten_init(sc);
                vcons_redraw_screen(sc->vd.active);
        }

        return (0);
}

static int
agten_fb_ioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
        struct agten_softc *sc = device_lookup_private(&agten_cd, minor(dev));
        struct fbgattr *fba;
        int error;

        switch (cmd) {

        case FBIOGTYPE:
                *(struct fbtype *)data = sc->sc_fb.fb_type;
                break;

        case FBIOGATTR:
                fba = (struct fbgattr *)data;
                fba->real_type = sc->sc_fb.fb_type.fb_type;
                fba->owner = 0;         /* XXX ??? */
                fba->fbtype = sc->sc_fb.fb_type;
                fba->sattr.flags = 0;
                fba->sattr.emu_type = sc->sc_fb.fb_type.fb_type;
                fba->sattr.dev_specific[0] = -1;
                fba->emu_types[0] = sc->sc_fb.fb_type.fb_type;
                fba->emu_types[1] = -1;
                break;

        case FBIOGETCMAP:
#define p ((struct fbcmap *)data)
                return (bt_getcmap(p, &sc->sc_cmap, 256, 1));

        case FBIOPUTCMAP:
                /* copy to software map */
                error = bt_putcmap(p, &sc->sc_cmap, 256, 1);
                if (error)
                        return (error);
                /* now blast them into the chip */
                /* don't bother - we're 24bit */
#undef p
                break;

        case FBIOGVIDEO:
                *(int *)data = agten_get_video(sc);
                break;

        case FBIOSVIDEO:
                agten_set_video(sc, *(int *)data);
                break;

/* these are for both FBIOSCURSOR and FBIOGCURSOR */
#define p ((struct fbcursor *)data)
#define pc (&sc->sc_cursor)

        case FBIOGCURSOR:
                /* does anyone use this ioctl?! */
                p->set = FB_CUR_SETALL; /* close enough, anyway */
                p->enable = 1;
                p->pos.x = sc->sc_cursor_x;
                p->pos.y = sc->sc_cursor_y;
                p->size.x = 64;
                p->size.y = 64;
                break;

        case FBIOSCURSOR:
                agten_do_sun_cursor(sc, p);
        break;

#undef p
#undef cc

        case FBIOGCURPOS:
        {
                struct fbcurpos *cp = (struct fbcurpos *)data;
                cp->x = sc->sc_cursor_x;
                cp->y = sc->sc_cursor_y;
        }
        break;

        case FBIOSCURPOS:
        {
                struct fbcurpos *cp = (struct fbcurpos *)data;
                agten_move_cursor(sc, cp->x, cp->y);
        }
        break;

        case FBIOGCURMAX:
                /* max cursor size is 64x64 */
                ((struct fbcurpos *)data)->x = 64;
                ((struct fbcurpos *)data)->y = 64;
                break;

        default:
                return (ENOTTY);
        }
        return (0);
}

static paddr_t
agten_fb_mmap(dev_t dev, off_t off, int prot)
{
        struct agten_softc *sc = device_lookup_private(&agten_cd, minor(dev));

        /*
         * mappings are subject to change
         * for now we put the framebuffer at offset 0 and the GLint registers
         * right after that. We may want to expose more register ranges and
         * probably will want to map the 2nd framebuffer as well
         */

        if (off < 0)
                return EINVAL;

        if (off >= sc->sc_glint_fbsz + 0x10000)
                return EINVAL;

        if (off < sc->sc_glint_fbsz) {
                return (bus_space_mmap(sc->sc_bustag,
                        sc->sc_glint_fb,
                        off,
                        prot,
                        BUS_SPACE_MAP_LINEAR));
        }

        off -= sc->sc_glint_fbsz;
        if (off < 0x10000) {
                return (bus_space_mmap(sc->sc_bustag,
                        sc->sc_glint_regs,
                        off,
                        prot,
                        BUS_SPACE_MAP_LINEAR));
        }
        return EINVAL;
}