/* $NetBSD: xcfb.c,v 1.60 2021/12/06 16:00:07 abs Exp $ */

/*-
 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Tohru Nishimura.
 *
 * 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: xcfb.c,v 1.60 2021/12/06 16:00:07 abs Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/ioctl.h>

#include <sys/bus.h>
#include <sys/intr.h>

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

#include <dev/rasops/rasops.h>
#include <dev/wsfont/wsfont.h>

#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicreg.h>
#include <dev/ic/ims332reg.h>
#include <pmax/pmax/maxine.h>

struct hwcmap256 {
#define CMAP_SIZE       256     /* 256 R/G/B entries */
        uint8_t r[CMAP_SIZE];
        uint8_t g[CMAP_SIZE];
        uint8_t b[CMAP_SIZE];
};

struct hwcursor64 {
        struct wsdisplay_curpos cc_pos;
        struct wsdisplay_curpos cc_hot;
        struct wsdisplay_curpos cc_size;
        struct wsdisplay_curpos cc_magic;       /* not used by PMAG-DV */
#define CURSOR_MAX_SIZE 64
        uint8_t cc_color[6];
        uint64_t cc_image[CURSOR_MAX_SIZE];
        uint64_t cc_mask[CURSOR_MAX_SIZE];
};

#define XCFB_FB_BASE    (XINE_PHYS_CFB_START + 0x2000000)
#define XCFB_FB_SIZE    0x100000

#define IMS332_HIGH     (IOASIC_SLOT_5_START)
#define IMS332_RLOW     (IOASIC_SLOT_7_START)
#define IMS332_WLOW     (IOASIC_SLOT_7_START + 0x20000)

struct xcfb_softc {
        vaddr_t sc_vaddr;
        size_t sc_size;
        struct rasops_info *sc_ri;
        struct hwcmap256 sc_cmap;       /* software copy of colormap */
        struct hwcursor64 sc_cursor;    /* software copy of cursor */
        int sc_blanked;
        /* XXX MAXINE can take PMAG-DV vertical retrace interrupt XXX */
        int nscreens;
        /* cursor coordinate is located at upper-left corner */
        int sc_csr;                     /* software copy of IMS332 CSR A */
};

static int  xcfbmatch(device_t, cfdata_t, void *);
static void xcfbattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(xcfb, sizeof(struct xcfb_softc),
    xcfbmatch, xcfbattach, NULL, NULL);

static tc_addr_t xcfb_consaddr;
static struct rasops_info xcfb_console_ri;
static void xcfb_common_init(struct rasops_info *);
static void xcfbhwinit(void *);
int xcfb_cnattach(void);

struct wsscreen_descr xcfb_stdscreen = {
        "std", 0, 0,
        0, /* textops */
        0, 0,
        WSSCREEN_REVERSE
};

static const struct wsscreen_descr *_xcfb_scrlist[] = {
        &xcfb_stdscreen,
};

static const struct wsscreen_list xcfb_screenlist = {
        sizeof(_xcfb_scrlist) / sizeof(struct wsscreen_descr *), _xcfb_scrlist
};

static int      xcfbioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t  xcfbmmap(void *, void *, off_t, int);

static int      xcfb_alloc_screen(void *, const struct wsscreen_descr *,
                                       void **, int *, int *, long *);
static void     xcfb_free_screen(void *, void *);
static int      xcfb_show_screen(void *, void *, int,
                                      void (*) (void *, int, int), void *);

static const struct wsdisplay_accessops xcfb_accessops = {
        xcfbioctl,
        xcfbmmap,
        xcfb_alloc_screen,
        xcfb_free_screen,
        xcfb_show_screen,
        0 /* load_font */
};

static int  xcfbintr(void *);
static void xcfb_screenblank(struct xcfb_softc *);
static void xcfb_cmap_init(struct xcfb_softc *);
static int  set_cmap(struct xcfb_softc *, struct wsdisplay_cmap *);
static int  get_cmap(struct xcfb_softc *, struct wsdisplay_cmap *);
static int  set_cursor(struct xcfb_softc *, struct wsdisplay_cursor *);
static int  get_cursor(struct xcfb_softc *, struct wsdisplay_cursor *);
static void set_curpos(struct xcfb_softc *, struct wsdisplay_curpos *);
static void ims332_loadcmap(struct hwcmap256 *);
static void ims332_set_curpos(struct xcfb_softc *);
static void ims332_load_curcmap(struct xcfb_softc *);
static void ims332_load_curshape(struct xcfb_softc *);
static void ims332_write_reg(int, uint32_t);
#if 0
static uint32_t ims332_read_reg(int);
#endif

extern long ioasic_base;        /* XXX */

/*
 * Compose 2 bit/pixel cursor image.
 *   M M M M I I I I            M I M I M I M I
 *      [ before ]                 [ after ]
 *   3 2 1 0 3 2 1 0            3 3 2 2 1 1 0 0
 *   7 6 5 4 7 6 5 4            7 7 6 6 5 5 4 4
 */
static const uint8_t shuffle[256] = {
        0x00, 0x01, 0x04, 0x05, 0x10, 0x11, 0x14, 0x15,
        0x40, 0x41, 0x44, 0x45, 0x50, 0x51, 0x54, 0x55,
        0x02, 0x03, 0x06, 0x07, 0x12, 0x13, 0x16, 0x17,
        0x42, 0x43, 0x46, 0x47, 0x52, 0x53, 0x56, 0x57,
        0x08, 0x09, 0x0c, 0x0d, 0x18, 0x19, 0x1c, 0x1d,
        0x48, 0x49, 0x4c, 0x4d, 0x58, 0x59, 0x5c, 0x5d,
        0x0a, 0x0b, 0x0e, 0x0f, 0x1a, 0x1b, 0x1e, 0x1f,
        0x4a, 0x4b, 0x4e, 0x4f, 0x5a, 0x5b, 0x5e, 0x5f,
        0x20, 0x21, 0x24, 0x25, 0x30, 0x31, 0x34, 0x35,
        0x60, 0x61, 0x64, 0x65, 0x70, 0x71, 0x74, 0x75,
        0x22, 0x23, 0x26, 0x27, 0x32, 0x33, 0x36, 0x37,
        0x62, 0x63, 0x66, 0x67, 0x72, 0x73, 0x76, 0x77,
        0x28, 0x29, 0x2c, 0x2d, 0x38, 0x39, 0x3c, 0x3d,
        0x68, 0x69, 0x6c, 0x6d, 0x78, 0x79, 0x7c, 0x7d,
        0x2a, 0x2b, 0x2e, 0x2f, 0x3a, 0x3b, 0x3e, 0x3f,
        0x6a, 0x6b, 0x6e, 0x6f, 0x7a, 0x7b, 0x7e, 0x7f,
        0x80, 0x81, 0x84, 0x85, 0x90, 0x91, 0x94, 0x95,
        0xc0, 0xc1, 0xc4, 0xc5, 0xd0, 0xd1, 0xd4, 0xd5,
        0x82, 0x83, 0x86, 0x87, 0x92, 0x93, 0x96, 0x97,
        0xc2, 0xc3, 0xc6, 0xc7, 0xd2, 0xd3, 0xd6, 0xd7,
        0x88, 0x89, 0x8c, 0x8d, 0x98, 0x99, 0x9c, 0x9d,
        0xc8, 0xc9, 0xcc, 0xcd, 0xd8, 0xd9, 0xdc, 0xdd,
        0x8a, 0x8b, 0x8e, 0x8f, 0x9a, 0x9b, 0x9e, 0x9f,
        0xca, 0xcb, 0xce, 0xcf, 0xda, 0xdb, 0xde, 0xdf,
        0xa0, 0xa1, 0xa4, 0xa5, 0xb0, 0xb1, 0xb4, 0xb5,
        0xe0, 0xe1, 0xe4, 0xe5, 0xf0, 0xf1, 0xf4, 0xf5,
        0xa2, 0xa3, 0xa6, 0xa7, 0xb2, 0xb3, 0xb6, 0xb7,
        0xe2, 0xe3, 0xe6, 0xe7, 0xf2, 0xf3, 0xf6, 0xf7,
        0xa8, 0xa9, 0xac, 0xad, 0xb8, 0xb9, 0xbc, 0xbd,
        0xe8, 0xe9, 0xec, 0xed, 0xf8, 0xf9, 0xfc, 0xfd,
        0xaa, 0xab, 0xae, 0xaf, 0xba, 0xbb, 0xbe, 0xbf,
        0xea, 0xeb, 0xee, 0xef, 0xfa, 0xfb, 0xfe, 0xff,
};

static int
xcfbmatch(device_t parent, cfdata_t match, void *aux)
{
        struct tc_attach_args *ta = aux;

        if (strncmp("PMAG-DV ", ta->ta_modname, TC_ROM_LLEN) != 0)
                return (0);

        return (1);
}

static void
xcfbattach(device_t parent, device_t self, void *aux)
{
        struct xcfb_softc *sc = device_private(self);
        struct tc_attach_args *ta = aux;
        struct rasops_info *ri;
        struct wsemuldisplaydev_attach_args waa;
        int console;

        console = (ta->ta_addr == xcfb_consaddr);
        if (console) {
                sc->sc_ri = ri = &xcfb_console_ri;
                ri->ri_flg &= ~RI_NO_AUTO;
                sc->nscreens = 1;
        }
        else {
                ri = malloc(sizeof(struct rasops_info), M_DEVBUF, M_WAITOK | M_ZERO);
                ri->ri_hw = (void *)ioasic_base;
                xcfb_common_init(ri);
                sc->sc_ri = ri;
        }
        printf(": %dx%d, %dbpp\n", ri->ri_width, ri->ri_height, ri->ri_depth);

        xcfb_cmap_init(sc);

        sc->sc_vaddr = ta->ta_addr;
        sc->sc_blanked = 0;
        sc->sc_csr = IMS332_BPP_8 | IMS332_CSR_A_VTG_ENABLE;

        tc_intr_establish(parent, ta->ta_cookie, IPL_TTY, xcfbintr, sc);

        waa.console = console;
        waa.scrdata = &xcfb_screenlist;
        waa.accessops = &xcfb_accessops;
        waa.accesscookie = sc;

        config_found(self, &waa, wsemuldisplaydevprint, CFARGS_NONE);
}

static void
xcfb_cmap_init(struct xcfb_softc *sc)
{
        struct hwcmap256 *cm;
        const uint8_t *p;
        int index;

        cm = &sc->sc_cmap;
        p = rasops_cmap;
        for (index = 0; index < CMAP_SIZE; index++, p += 3) {
                cm->r[index] = p[0];
                cm->g[index] = p[1];
                cm->b[index] = p[2];
        }
}

static void
xcfb_common_init(struct rasops_info *ri)
{
        int cookie;

        /* initialize colormap and cursor hardware */
        xcfbhwinit((void *)ri->ri_hw);

        ri->ri_flg = RI_CENTER;
        if (ri == &xcfb_console_ri)
                ri->ri_flg |= RI_NO_AUTO;
        ri->ri_depth = 8;
        ri->ri_width = 1024;
        ri->ri_height = 768;
        ri->ri_stride = 1024;
        ri->ri_bits = (void *)MIPS_PHYS_TO_KSEG1(XCFB_FB_BASE);

        /* clear the screen */
        memset(ri->ri_bits, 0, ri->ri_stride * ri->ri_height);

        wsfont_init();
        /* prefer 12 pixel wide font */
        cookie = wsfont_find(NULL, 12, 0, 0, WSDISPLAY_FONTORDER_L2R,
            WSDISPLAY_FONTORDER_L2R, WSFONT_FIND_BITMAP);
        if (cookie <= 0)
                cookie = wsfont_find(NULL, 0, 0, 0, WSDISPLAY_FONTORDER_L2R,
                    WSDISPLAY_FONTORDER_L2R, WSFONT_FIND_BITMAP);
        if (cookie <= 0) {
                printf("xcfb: font table is empty\n");
                return;
        }

        if (wsfont_lock(cookie, &ri->ri_font)) {
                printf("xcfb: couldn't lock font\n");
                return;
        }
        ri->ri_wsfcookie = cookie;

        rasops_init(ri, 34, 80);

        /* XXX shouldn't be global */
        xcfb_stdscreen.nrows = ri->ri_rows;
        xcfb_stdscreen.ncols = ri->ri_cols;
        xcfb_stdscreen.textops = &ri->ri_ops;
        xcfb_stdscreen.capabilities = ri->ri_caps;
}

int
xcfb_cnattach(void)
{
        struct rasops_info *ri;
        long defattr;

        ri = &xcfb_console_ri;
        ri->ri_hw = (void *)ioasic_base;
        xcfb_common_init(ri);
        (*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);
        wsdisplay_cnattach(&xcfb_stdscreen, ri, 0, 0, defattr);
        xcfb_consaddr = MIPS_PHYS_TO_KSEG1(XINE_PHYS_CFB_START);
        return (0);
}

static void
xcfbhwinit(void *base)
{
        volatile uint32_t *csr;
        uint32_t i;
        const uint8_t *p;

        csr = (volatile uint32_t *)((char *)base + IOASIC_CSR);
        i = *csr;
        i &= ~XINE_CSR_VDAC_ENABLE;
        *csr = i;
        DELAY(50);
        i |= XINE_CSR_VDAC_ENABLE;
        *csr = i;
        DELAY(50);
        ims332_write_reg(IMS332_REG_BOOT, 0x2c);
        ims332_write_reg(IMS332_REG_CSR_A,
                IMS332_BPP_8|IMS332_CSR_A_DISABLE_CURSOR);
        ims332_write_reg(IMS332_REG_HALF_SYNCH, 0x10);
        ims332_write_reg(IMS332_REG_BACK_PORCH, 0x21);
        ims332_write_reg(IMS332_REG_DISPLAY, 0x100);
        ims332_write_reg(IMS332_REG_SHORT_DIS, 0x5d);
        ims332_write_reg(IMS332_REG_BROAD_PULSE, 0x9f);
        ims332_write_reg(IMS332_REG_LINE_TIME, 0x146);
        ims332_write_reg(IMS332_REG_V_SYNC, 0x0c);
        ims332_write_reg(IMS332_REG_V_PRE_EQUALIZE, 0x02);
        ims332_write_reg(IMS332_REG_V_POST_EQUALIZE, 0x02);
        ims332_write_reg(IMS332_REG_V_BLANK, 0x2a);
        ims332_write_reg(IMS332_REG_V_DISPLAY, 0x600);
        ims332_write_reg(IMS332_REG_LINE_START, 0x10);
        ims332_write_reg(IMS332_REG_MEM_INIT, 0x0a);
        ims332_write_reg(IMS332_REG_COLOR_MASK, 0xffffff);
        ims332_write_reg(IMS332_REG_CSR_A,
                IMS332_BPP_8|IMS332_CSR_A_VTG_ENABLE);

        /* build sane colormap */
        p = rasops_cmap;
        for (i = 0; i < CMAP_SIZE; i++, p += 3) {
                uint32_t bgr;

                bgr = p[2] << 16 | p[1] << 8 | p[0];
                ims332_write_reg(IMS332_REG_LUT_BASE + i, bgr);
        }

        /* clear out cursor image */
        for (i = 0; i < 512; i++)
                ims332_write_reg(IMS332_REG_CURSOR_RAM + i, 0);

        /*
         * 2 bit/pixel cursor.  Assign MSB for cursor mask and LSB for
         * cursor image.  LUT_1 for mask color, while LUT_2 for
         * image color.  LUT_0 will be never used.
         */
        ims332_write_reg(IMS332_REG_CURSOR_LUT_0, 0);
        ims332_write_reg(IMS332_REG_CURSOR_LUT_1, 0xffffff);
        ims332_write_reg(IMS332_REG_CURSOR_LUT_2, 0xffffff);
}

static int
xcfbioctl(void *v, void *vs, u_long cmd, void *data, int flag, struct lwp *l)
{
        struct xcfb_softc *sc = v;
        struct rasops_info *ri = sc->sc_ri;
        int turnoff, error;

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

        case WSDISPLAYIO_GET_FBINFO: {
                struct wsdisplayio_fbinfo *fbi = data;
                return wsdisplayio_get_fbinfo(sc->sc_ri, fbi);
        }

        case WSDISPLAYIO_GINFO:
#define wsd_fbip ((struct wsdisplay_fbinfo *)data)
                wsd_fbip->height = ri->ri_height;
                wsd_fbip->width = ri->ri_width;
                wsd_fbip->depth = ri->ri_depth;
                wsd_fbip->cmsize = CMAP_SIZE;
#undef fbt
                return (0);

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

        case WSDISPLAYIO_PUTCMAP:
                error = set_cmap(sc, (struct wsdisplay_cmap *)data);
                if (error == 0)
                        ims332_loadcmap(&sc->sc_cmap);
                return (error);

        case WSDISPLAYIO_SVIDEO:
                turnoff = *(int *)data == WSDISPLAYIO_VIDEO_OFF;
                if (sc->sc_blanked != turnoff) {
                        sc->sc_blanked = turnoff;
                        xcfb_screenblank(sc);
                }
                return (0);

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

        case WSDISPLAYIO_GCURPOS:
                *(struct wsdisplay_curpos *)data = sc->sc_cursor.cc_pos;
                return (0);

        case WSDISPLAYIO_SCURPOS:
                set_curpos(sc, (struct wsdisplay_curpos *)data);
                ims332_set_curpos(sc);
                return (0);

        case WSDISPLAYIO_GCURMAX:
                ((struct wsdisplay_curpos *)data)->x =
                ((struct wsdisplay_curpos *)data)->y = CURSOR_MAX_SIZE;
                return (0);

        case WSDISPLAYIO_GCURSOR:
                return get_cursor(sc, (struct wsdisplay_cursor *)data);

        case WSDISPLAYIO_SCURSOR:
                return set_cursor(sc, (struct wsdisplay_cursor *)data);

        case WSDISPLAYIO_SMODE:
                if (*(int *)data == WSDISPLAYIO_MODE_EMUL) {
                        sc->sc_csr |= IMS332_CSR_A_DISABLE_CURSOR;
                        ims332_write_reg(IMS332_REG_CSR_A, sc->sc_csr);
                        xcfb_cmap_init(sc);
                        ims332_loadcmap(&sc->sc_cmap);
                        sc->sc_blanked = 0;
                        xcfb_screenblank(sc);
                }
                return (0);
        }
        return (EPASSTHROUGH);
}

static paddr_t
xcfbmmap(void *v, void *vs, off_t offset, int prot)
{

        if (offset >= XCFB_FB_SIZE || offset < 0)
                return (-1);
        return mips_btop(MIPS_KSEG1_TO_PHYS(XCFB_FB_BASE + offset));
}

static int
xcfb_alloc_screen(void *v, const struct wsscreen_descr *type, void **cookiep,
    int *curxp, int *curyp, long *attrp)
{
        struct xcfb_softc *sc = v;
        struct rasops_info *ri = sc->sc_ri;
        long defattr;

        if (sc->nscreens > 0)
                return (ENOMEM);

        *cookiep = ri;          /* one and only for now */
        *curxp = 0;
        *curyp = 0;
        (*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);
        *attrp = defattr;
        sc->nscreens++;
        return (0);
}

static void
xcfb_free_screen(void *v, void *cookie)
{
        struct xcfb_softc *sc = v;

        if (sc->sc_ri == &xcfb_console_ri)
                panic("xcfb_free_screen: console");

        sc->nscreens--;
}

static int
xcfb_show_screen(void *v, void *cookie, int waitok,
    void (*cb)(void *, int, int), void *cbarg)
{

        return (0);
}

static int
xcfbintr(void *v)
{
        struct xcfb_softc *sc = v;
        uint32_t *intr, i;

        intr = (uint32_t *)((char *)sc->sc_ri->ri_hw + IOASIC_INTR);
        i = *intr;
        i &= ~XINE_INTR_VINT;
        *intr = i;
        return (1);
}

static void
xcfb_screenblank(struct xcfb_softc *sc)
{
        if (sc->sc_blanked)
                sc->sc_csr |= IMS332_CSR_A_FORCE_BLANK;
        else
                sc->sc_csr &= ~IMS332_CSR_A_FORCE_BLANK;
        ims332_write_reg(IMS332_REG_CSR_A, sc->sc_csr);
}

static int
get_cmap(struct xcfb_softc *sc, struct wsdisplay_cmap *p)
{
        u_int index = p->index, count = p->count;
        int error;

        if (index >= CMAP_SIZE || count > CMAP_SIZE - index)
                return (EINVAL);

        error = copyout(&sc->sc_cmap.r[index], p->red, count);
        if (error)
                return error;
        error = copyout(&sc->sc_cmap.g[index], p->green, count);
        if (error)
                return error;
        error = copyout(&sc->sc_cmap.b[index], p->blue, count);
        return error;
}

static int
set_cmap(struct xcfb_softc *sc, struct wsdisplay_cmap *p)
{
        struct hwcmap256 cmap;
        u_int index = p->index, count = p->count;
        int error;

        if (index >= CMAP_SIZE || count > CMAP_SIZE - index)
                return (EINVAL);

        error = copyin(p->red, &cmap.r[index], count);
        if (error)
                return error;
        error = copyin(p->green, &cmap.g[index], count);
        if (error)
                return error;
        error = copyin(p->blue, &cmap.b[index], count);
        if (error)
                return error;
        memcpy(&sc->sc_cmap.r[index], &cmap.r[index], count);
        memcpy(&sc->sc_cmap.g[index], &cmap.g[index], count);
        memcpy(&sc->sc_cmap.b[index], &cmap.b[index], count);
        return (0);
}

static int
set_cursor(struct xcfb_softc *sc, struct wsdisplay_cursor *p)
{
#define cc (&sc->sc_cursor)
        u_int v, index = 0, count = 0, icount = 0;
        uint8_t r[2], g[2], b[2], image[512], mask[512];
        int error;

        v = p->which;
        if (v & WSDISPLAY_CURSOR_DOCMAP) {
                index = p->cmap.index;
                count = p->cmap.count;

                if (index >= 2 || count > 2 - index)
                        return (EINVAL);
                error = copyin(p->cmap.red, &r[index], count);
                if (error)
                        return error;
                error = copyin(p->cmap.green, &g[index], count);
                if (error)
                        return error;
                error = copyin(p->cmap.blue, &b[index], count);
                if (error)
                        return error;
        }
        if (v & WSDISPLAY_CURSOR_DOSHAPE) {
                if (p->size.x > CURSOR_MAX_SIZE || p->size.y > CURSOR_MAX_SIZE)
                        return (EINVAL);
                icount = ((p->size.x < 33) ? 4 : 8) * p->size.y;
                error = copyin(p->image, image, icount);
                if (error)
                        return error;
                error = copyin(p->mask, mask, icount);
                if (error)
                        return error;
        }

        if (v & WSDISPLAY_CURSOR_DOCMAP) {
                memcpy(&cc->cc_color[index], &r[index], count);
                memcpy(&cc->cc_color[index + 2], &g[index], count);
                memcpy(&cc->cc_color[index + 4], &b[index], count);
                ims332_load_curcmap(sc);
        }
        if (v & WSDISPLAY_CURSOR_DOSHAPE) {
                cc->cc_size = p->size;
                memset(cc->cc_image, 0, sizeof cc->cc_image);
                memcpy(cc->cc_image, image, icount);
                memset(cc->cc_mask, 0, sizeof cc->cc_mask);
                memcpy(cc->cc_mask, mask, icount);
                ims332_load_curshape(sc);
        }
        if (v & WSDISPLAY_CURSOR_DOCUR) {
                cc->cc_hot = p->hot;
                if (p->enable)
                        sc->sc_csr &= ~IMS332_CSR_A_DISABLE_CURSOR;
                else
                        sc->sc_csr |= IMS332_CSR_A_DISABLE_CURSOR;
                ims332_write_reg(IMS332_REG_CSR_A, sc->sc_csr);
        }
        if (v & WSDISPLAY_CURSOR_DOPOS) {
                set_curpos(sc, &p->pos);
                ims332_set_curpos(sc);
        }

        return (0);
#undef cc
}

static int
get_cursor(struct xcfb_softc *sc, struct wsdisplay_cursor *p)
{
        return (EPASSTHROUGH); /* XXX */
}

static void
set_curpos(struct xcfb_softc *sc, struct wsdisplay_curpos *curpos)
{
        struct rasops_info *ri = sc->sc_ri;
        int x = curpos->x, y = curpos->y;

        if (y < 0)
                y = 0;
        else if (y > ri->ri_height)
                y = ri->ri_height;
        if (x < 0)
                x = 0;
        else if (x > ri->ri_width)
                x = ri->ri_width;
        sc->sc_cursor.cc_pos.x = x;
        sc->sc_cursor.cc_pos.y = y;
}

static void
ims332_loadcmap(struct hwcmap256 *cm)
{
        int i;
        uint32_t rgb;

        for (i = 0; i < CMAP_SIZE; i++) {
                rgb = cm->b[i] << 16 | cm->g[i] << 8 | cm->r[i];
                ims332_write_reg(IMS332_REG_LUT_BASE + i, rgb);
        }
}

static void
ims332_set_curpos(struct xcfb_softc *sc)
{
        struct wsdisplay_curpos *curpos = &sc->sc_cursor.cc_pos;
        uint32_t pos;
        int s;

        s = spltty();
        pos = (curpos->x & 0xfff) << 12 | (curpos->y & 0xfff);
        ims332_write_reg(IMS332_REG_CURSOR_LOC, pos);
        splx(s);
}

static void
ims332_load_curcmap(struct xcfb_softc *sc)
{
        uint8_t *cp = sc->sc_cursor.cc_color;
        uint32_t rgb;

        /* cursor background */
        rgb = cp[5] << 16 | cp[3] << 8 | cp[1];
        ims332_write_reg(IMS332_REG_CURSOR_LUT_1, rgb);

        /* cursor foreground */
        rgb = cp[4] << 16 | cp[2] << 8 | cp[0];
        ims332_write_reg(IMS332_REG_CURSOR_LUT_2, rgb);
}

static void
ims332_load_curshape(struct xcfb_softc *sc)
{
        u_int i, img, msk, bits;
        uint8_t u, *ip, *mp;

        ip = (uint8_t *)sc->sc_cursor.cc_image;
        mp = (uint8_t *)sc->sc_cursor.cc_mask;

        i = 0;
        /* 64 pixel scan line is consisted with 8 halfword cursor ram */
        while (i < sc->sc_cursor.cc_size.y * 8) {
                /* pad right half 32 pixel when smaller than 33 */
                if ((i & 0x4) && sc->sc_cursor.cc_size.x < 33)
                        bits = 0;
                else {
                        img = *ip++;
                        msk = *mp++;
                        img &= msk;     /* cookie off image */
                        u = (msk & 0x0f) << 4 | (img & 0x0f);
                        bits = shuffle[u];
                        u = (msk & 0xf0) | (img & 0xf0) >> 4;
                        bits = (shuffle[u] << 8) | bits;
                }
                ims332_write_reg(IMS332_REG_CURSOR_RAM + i, bits);
                i += 1;
        }
        /* pad unoccupied scan lines */
        while (i < CURSOR_MAX_SIZE * 8) {
                ims332_write_reg(IMS332_REG_CURSOR_RAM + i, 0);
                i += 1;
        }
}

static void
ims332_write_reg(int regno, uint32_t val)
{
        void *high8 = (void *)(ioasic_base + IMS332_HIGH);
        void *low16 = (void *)(ioasic_base + IMS332_WLOW + (regno << 4));

        *(volatile uint16_t *)high8 = (val & 0xff0000) >> 8;
        *(volatile uint16_t *)low16 = val;
}

#if 0
static uint32_t
ims332_read_reg(int regno)
{
        void *high8 = (void *)(ioasic_base + IMS332_HIGH);
        void *low16 = (void *)(ioasic_base + IMS332_RLOW) + (regno << 4);
        u_int v0, v1;

        v1 = *(volatile uint16_t *)high8;
        v0 = *(volatile uint16_t *)low16;
        return (v1 & 0xff00) << 8 | v0;
}
#endif