/*      $OpenBSD: sisfb.c,v 1.2 2010/12/26 15:40:59 miod Exp $  */

/*
 * Copyright (c) 2010 Miodrag Vallat.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Minimalistic driver for the SIS315 Pro frame buffer found on the
 * Lemote Fuloong 2F systems.
 * Does not support accelaration, mode change, secondary output, or
 * anything fancy.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sisfb.c,v 1.9 2023/08/08 06:57:20 mrg Exp $");

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

#include <uvm/uvm_extern.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pciio.h>

#include <dev/videomode/videomode.h>

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

#include <dev/i2c/i2cvar.h>

#include <dev/pci/sisfb.h>

struct sisfb_softc;

/* minimal frame buffer information, suitable for early console */

struct sisfb {
        struct sisfb_softc      *sc;
        uint8_t                  cmap[256 * 3];

        bus_space_tag_t          fbt;
        bus_space_handle_t       fbh;
        bus_addr_t               fbbase;
        bus_size_t               fbsize;

        bus_space_tag_t          mmiot;
        bus_space_handle_t       mmioh;
        bus_addr_t               mmiobase;
        bus_size_t               mmiosize;

        bus_space_tag_t          iot;
        bus_space_handle_t       ioh;
        bus_addr_t               iobase;
        bus_size_t               iosize;

        struct vcons_screen      vcs;
        struct wsscreen_descr    wsd;

        int                      fb_depth;
        int                      fb_width;
        int                      fb_height;
        int                      fb_stride;
        void                     *fb_addr;
};

struct sisfb_softc {
        device_t                 sc_dev;
        struct sisfb            *sc_fb;
        struct sisfb             sc_fb_store;

        struct vcons_data       vd;
        struct wsscreen_list    sc_wsl;
        const struct wsscreen_descr     *sc_scrlist[1];
        int                     sc_nscr;
        int                     sc_mode;

        pci_chipset_tag_t       sc_pc;
        pcitag_t                sc_pt;
};

int     sisfb_match(device_t, cfdata_t, void *);
void    sisfb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(sisfb, sizeof(struct sisfb_softc),
    sisfb_match, sisfb_attach, NULL, NULL);


int     sisfb_alloc_screen(void *, const struct wsscreen_descr *, void **, int *,
            int *, long *);
void    sisfb_free_screen(void *, void *);
int     sisfb_ioctl(void *, void *, u_long, void *, int, struct lwp *);
int     sisfb_show_screen(void *, void *, int, void (*)(void *, int, int),
            void *);
paddr_t sisfb_mmap(void *, void *, off_t, int);
void    sisfb_init_screen(void *, struct vcons_screen *, int, long *);


struct wsdisplay_accessops sisfb_accessops = {
        sisfb_ioctl,
        sisfb_mmap,
        sisfb_alloc_screen,
        sisfb_free_screen,
        sisfb_show_screen,
        NULL,   /* load_font */
        NULL,   /* poolc */
        NULL    /* scroll */
};

int     sisfb_getcmap(uint8_t *, struct wsdisplay_cmap *);
void    sisfb_loadcmap(struct sisfb *, int, int);
int     sisfb_putcmap(uint8_t *, struct wsdisplay_cmap *);
int     sisfb_setup(struct sisfb *);

static struct sisfb sisfbcn;

/*
 * Control Register access
 *
 * These are 8 bit registers; the choice of larger width types is intentional.
 */

#define SIS_VGA_PORT_OFFSET     0x380

#define SEQ_ADDR                (0x3c4 - SIS_VGA_PORT_OFFSET)
#define SEQ_DATA                (0x3c5 - SIS_VGA_PORT_OFFSET)
#define DAC_ADDR                (0x3c8 - SIS_VGA_PORT_OFFSET)
#define DAC_DATA                (0x3c9 - SIS_VGA_PORT_OFFSET)
#undef  CRTC_ADDR
#define CRTC_ADDR               (0x3d4 - SIS_VGA_PORT_OFFSET)
#define CRTC_DATA               (0x3d5 - SIS_VGA_PORT_OFFSET)

#define CRTC_HDISPLE    0x01    /* horizontal display end */
#define CRTC_OVERFLL    0x07    /* overflow low */
#define CRTC_STARTADRH  0x0C    /* linear start address mid */
#define CRTC_STARTADRL  0x0D    /* linear start address low */
#define CRTC_VDE        0x12    /* vertical display end */


static inline uint sisfb_crtc_read(struct sisfb *, uint);
static inline void sisfb_crtc_write(struct sisfb *, uint, uint);
static inline uint sisfb_seq_read(struct sisfb *, uint);
static inline void sisfb_seq_write(struct sisfb *, uint, uint);

static inline uint
sisfb_crtc_read(struct sisfb *fb, uint idx)
{
        uint val;
        bus_space_write_1(fb->iot, fb->ioh, CRTC_ADDR, idx);
        val = bus_space_read_1(fb->iot, fb->ioh, CRTC_DATA);
#ifdef SIS_DEBUG
        printf("CRTC %04x -> %02x\n", idx, val);
#endif
        return val;
}

static inline void
sisfb_crtc_write(struct sisfb *fb, uint idx, uint val)
{
#ifdef SIS_DEBUG
        printf("CRTC %04x <- %02x\n", idx, val);
#endif
        bus_space_write_1(fb->iot, fb->ioh, CRTC_ADDR, idx);
        bus_space_write_1(fb->iot, fb->ioh, CRTC_DATA, val);
}

static inline uint
sisfb_seq_read(struct sisfb *fb, uint idx)
{
        uint val;
        bus_space_write_1(fb->iot, fb->ioh, SEQ_ADDR, idx);
        val = bus_space_read_1(fb->iot, fb->ioh, SEQ_DATA);
#ifdef SIS_DEBUG
        printf("SEQ %04x -> %02x\n", idx, val);
#endif
        return val;
}

static inline void
sisfb_seq_write(struct sisfb *fb, uint idx, uint val)
{
#ifdef SIS_DEBUG
        printf("SEQ %04x <- %02x\n", idx, val);
#endif
        bus_space_write_1(fb->iot, fb->ioh, SEQ_ADDR, idx);
        bus_space_write_1(fb->iot, fb->ioh, SEQ_DATA, val);
}

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

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

        if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_SIS)
                return 0;

        if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_SIS_315PRO_VGA)
                return 100;
        return (0);
}

void
sisfb_attach(device_t parent, device_t self, void *aux)
{
        struct sisfb_softc *sc = device_private(self);
        struct pci_attach_args *pa = (struct pci_attach_args *)aux;
        struct rasops_info *ri;
        struct wsemuldisplaydev_attach_args waa;
        struct sisfb *fb;
        int console;
        unsigned long defattr;

        sc->sc_dev = self;
        console = sisfbcn.vcs.scr_ri.ri_hw != NULL;

        if (console)
                fb = &sisfbcn;
        else {
                fb = &sc->sc_fb_store;
        }

        sc->sc_fb = fb;
        fb->sc = sc;

        pci_aprint_devinfo(pa, NULL);

        sc->sc_pt = pa->pa_tag;
        sc->sc_pc = pa->pa_pc;

        if (!console) {
                fb->fbt = pa->pa_memt;
                fb->mmiot = pa->pa_memt;
                fb->iot = pa->pa_iot;
                if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_TYPE_MEM,
                    BUS_SPACE_MAP_LINEAR, &fb->fbt, &fb->fbh,
                    &fb->fbbase, &fb->fbsize) != 0) {
                        aprint_error_dev(self, ": can't map frame buffer\n");
                        return;
                }

                if (pci_mapreg_map(pa, PCI_MAPREG_START + 4,
                    PCI_MAPREG_TYPE_MEM, 0,
                    &fb->mmiot, &fb->mmioh, &fb->mmiobase, &fb->mmiosize) != 0) {
                        aprint_error_dev(self, ": can't map mmio area\n");
                        goto fail1;
                }

                if (pci_mapreg_map(pa, PCI_MAPREG_START + 8, PCI_MAPREG_TYPE_IO,
                    0, &fb->iot, &fb->ioh, &fb->iobase, &fb->iosize) != 0) {
                        aprint_error_dev(self, ": can't map registers\n");
                        goto fail2;
                }


                if (sisfb_setup(sc->sc_fb) != 0) {
                        aprint_error_dev(self, ": can't setup frame buffer\n");
                        goto fail3;
                }
        }

        aprint_normal_dev(self, ": %dx%dx%d frame buffer\n",
            fb->vcs.scr_ri.ri_width, fb->vcs.scr_ri.ri_height,
            fb->vcs.scr_ri.ri_depth);

        aprint_debug_dev(self, ": fb 0x%" PRIxBUSSIZE "@0x%" PRIxBUSADDR
            ", mmio 0x%" PRIxBUSSIZE "@0x%" PRIxBUSADDR
            ", io 0x%" PRIxBUSSIZE "@0x%" PRIxBUSADDR "\n",
            fb->fbsize, fb->fbbase,
            fb->mmiosize, fb->mmiobase,
            fb->iosize, fb->iobase);

        fb->wsd = (struct wsscreen_descr){
                "default",
                0, 0,
                NULL,
                8, 16,
                WSSCREEN_WSCOLORS | WSSCREEN_HILIT,
                NULL
        };
        sc->sc_scrlist[0] = &fb->wsd;
        sc->sc_wsl = (struct wsscreen_list){1, sc->sc_scrlist};
        sc->sc_mode = WSDISPLAYIO_MODE_EMUL;


        vcons_init(&sc->vd, sc, &fb->wsd, &sisfb_accessops);
        sc->vd.init_screen = sisfb_init_screen;

        ri = &fb->vcs.scr_ri;
        if (console) {
                vcons_init_screen(&sc->vd, &fb->vcs, 1, &defattr);
                fb->vcs.scr_flags |= VCONS_SCREEN_IS_STATIC;
                fb->wsd.textops = &ri->ri_ops;
                fb->wsd.capabilities = ri->ri_caps;
                fb->wsd.nrows = ri->ri_rows;
                fb->wsd.ncols = ri->ri_cols;
                wsdisplay_cnattach(&fb->wsd, ri, 0, 0, defattr);
                vcons_replay_msgbuf(&fb->vcs);
        } else {
                /*
                 * since we're not the console we can postpone the rest
                 * until someone actually allocates a screen for us
                 */
                (*ri->ri_ops.allocattr)(ri, 0, 0, 0, &defattr);
        }

        waa.console = console;
        waa.scrdata = &sc->sc_wsl;
        waa.accessops = &sisfb_accessops;
        waa.accesscookie = &sc->vd;

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

fail3:
        bus_space_unmap(fb->iot, fb->ioh, fb->iosize);
fail2:
        bus_space_unmap(fb->mmiot, fb->mmioh, fb->mmiosize);
fail1:
        bus_space_unmap(fb->fbt, fb->fbh, fb->fbsize);
}

/*
 * wsdisplay accesops
 */

int
sisfb_alloc_screen(void *v, const struct wsscreen_descr *type, void **cookiep,
    int *curxp, int *curyp, long *attrp)
{
        struct sisfb_softc *sc = (struct sisfb_softc *)v;
        struct rasops_info *ri = &sc->sc_fb->vcs.scr_ri;

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

        *cookiep = ri;
        *curxp = *curyp = 0;
        ri->ri_ops.allocattr(ri, 0, 0, 0, attrp);
        sc->sc_nscr++;

        return 0;
}

void
sisfb_free_screen(void *v, void *cookie)
{
        struct sisfb_softc *sc = (struct sisfb_softc *)v;

        sc->sc_nscr--;
}

int
sisfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flags,
    struct lwp *l)
{
        struct vcons_data *vd = v;
        struct sisfb_softc *sc = vd->cookie;
        struct sisfb *fb = sc->sc_fb;
        struct rasops_info *ri = &fb->vcs.scr_ri;
        struct wsdisplay_cmap *cm;
        struct wsdisplay_fbinfo *wdf;
        int rc;

        switch (cmd) {
        case WSDISPLAYIO_GTYPE:
                *(uint *)data = WSDISPLAY_TYPE_PCIMISC;
                return 0;
        case WSDISPLAYIO_GINFO:
                if (vd->active != NULL) {
                        wdf = (struct wsdisplay_fbinfo *)data;
                        wdf->width = ri->ri_width;
                        wdf->height = ri->ri_height;
                        wdf->depth = ri->ri_depth;
                        wdf->cmsize = 256;
                        return 0;
                } else
                        return ENODEV;
        case WSDISPLAYIO_LINEBYTES:
                *(uint *)data = ri->ri_stride;
                return 0;
        case WSDISPLAYIO_GETCMAP:
                cm = (struct wsdisplay_cmap *)data;
                rc = sisfb_getcmap(fb->cmap, cm);
                return rc;
        case WSDISPLAYIO_PUTCMAP:
                cm = (struct wsdisplay_cmap *)data;
                rc = sisfb_putcmap(fb->cmap, cm);
                if (rc != 0)
                        return rc;
                if (ri->ri_depth == 8)
                        sisfb_loadcmap(fb, cm->index, cm->count);
                return 0;
        case WSDISPLAYIO_SMODE:
                sc->sc_mode = *(uint *)data;
                aprint_debug_dev(sc->sc_dev, ": switching to ");
                switch(sc->sc_mode) {
                case WSDISPLAYIO_MODE_EMUL:
                        aprint_debug("WSDISPLAYIO_MODE_EMUL\n");
                        break;
                case WSDISPLAYIO_MODE_MAPPED:
                        aprint_debug("WSDISPLAYIO_MODE_MAPPED\n");
                        break;
                case WSDISPLAYIO_MODE_DUMBFB:
                        aprint_debug("WSDISPLAYIO_MODE_DUMBFB\n");
                        break;
                default:
                        aprint_debug("unknown mode %d\n", sc->sc_mode);
                        return EINVAL;
                }
                return 0;
        case WSDISPLAYIO_GMODE:
                *(uint *)data = sc->sc_mode;
                return 0;
        case PCI_IOC_CFGREAD:
        case PCI_IOC_CFGWRITE:
                return pci_devioctl(sc->sc_pc, sc->sc_pt, cmd, data, flags, l);
        case WSDISPLAYIO_GET_BUSID:
                return wsdisplayio_busid_pci(sc->sc_dev, sc->sc_pc,
                    sc->sc_pt, data);
        }
        return EPASSTHROUGH;
}

int
sisfb_show_screen(void *v, void *cookie, int waitok,
    void (*cb)(void *, int, int), void *cbarg)
{
        return 0;
}

paddr_t
sisfb_mmap(void *v, void *vs, off_t offset, int prot)
{
        struct vcons_data *vd = v;
        struct sisfb_softc *sc = vd->cookie;
        struct rasops_info *ri = &sc->sc_fb->vcs.scr_ri;
        struct sisfb *fb = sc->sc_fb;
        const uintptr_t fb_offset =
          (uintptr_t)bus_space_vaddr(fb->fbt, fb->fbh) - (uintptr_t)fb->fb_addr;
        paddr_t pa;

        if (sc->sc_mode != WSDISPLAYIO_MODE_MAPPED) {
                if (offset >= 0 && offset < ri->ri_stride * ri->ri_height) {
                        pa = bus_space_mmap(fb->fbt,
                            fb->fbbase, fb_offset + offset,
                            prot, BUS_SPACE_MAP_LINEAR);
                        return pa;
                }
                return -1;
        }

        if (kauth_authorize_machdep(kauth_cred_get(), 
            KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) != 0) {
                aprint_error_dev(sc->sc_dev, "mmap() rejected.\n");
                return -1;
        }       

        if (offset >= (fb->fbbase & ~PAGE_MASK) &&
            offset <= ((fb->fbbase + fb->fbsize + PAGE_SIZE - 1) & ~PAGE_MASK)) {
                pa = bus_space_mmap(fb->fbt, fb->fbbase, offset - fb->fbbase,
                    prot, BUS_SPACE_MAP_LINEAR|BUS_SPACE_MAP_PREFETCHABLE);
                return pa;
        }
        if (offset >= (fb->mmiobase & ~PAGE_MASK) &&
            offset <= ((fb->mmiobase + fb->mmiosize + PAGE_SIZE - 1) & ~PAGE_MASK)) {
                pa = bus_space_mmap(fb->mmiot, fb->mmiobase, offset - fb->mmiobase,
                    prot, BUS_SPACE_MAP_LINEAR);
                return pa;
        }
        if (offset >= (fb->iobase & ~PAGE_MASK) &&
            offset <= ((fb->iobase + fb->iosize + PAGE_SIZE - 1) & ~PAGE_MASK)) {
                pa = bus_space_mmap(fb->iot, fb->iobase, offset - fb->iobase,
                    prot, BUS_SPACE_MAP_LINEAR);
                return pa;
        }
        return -1;
}

void
sisfb_init_screen(void *cookie, struct vcons_screen *scr,
    int existing, long *defattr)
{
        struct sisfb_softc *sc = cookie;
        struct sisfb *fb = sc->sc_fb;
        struct rasops_info *ri = &scr->scr_ri;

        ri->ri_depth = fb->fb_depth;
        ri->ri_width = fb->fb_width;
        ri->ri_height = fb->fb_height;
        ri->ri_stride = fb->fb_stride;
        ri->ri_flg = RI_CENTER | RI_FULLCLEAR;

        ri->ri_bits = fb->fb_addr;

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

        rasops_init(ri, fb->fb_height / 8, fb->fb_width / 8);
        ri->ri_caps = WSSCREEN_WSCOLORS;
        rasops_reconfig(ri, fb->fb_height / ri->ri_font->fontheight,
                    fb->fb_width / ri->ri_font->fontwidth);

        ri->ri_hw = scr;
}


/*
 * Frame buffer initialization.
 */

int
sisfb_setup(struct sisfb *fb)
{
        struct rasops_info *ri = &fb->vcs.scr_ri;
        uint width, height, bpp;
        bus_size_t fbaddr;
        uint tmp;

        /*
         * Unlock access to extended registers.
         */

        sisfb_seq_write(fb, 0x05, 0x86);

        /*
         * Try and figure out display settings.
         */

        height = sisfb_crtc_read(fb, CRTC_VDE);
        tmp = sisfb_crtc_read(fb, CRTC_OVERFLL);
        if (ISSET(tmp, 1 << 1))
                height |= 1 << 8;
        if (ISSET(tmp, 1 << 6))
                height |= 1 << 9;
        tmp = sisfb_seq_read(fb, 0x0a);
        if (ISSET(tmp, 1 << 1))
                height |= 1 << 10;
        height++;

        width = sisfb_crtc_read(fb, CRTC_HDISPLE);
        tmp = sisfb_seq_read(fb, 0x0b);
        if (ISSET(tmp, 1 << 2))
                width |= 1 << 8;
        if (ISSET(tmp, 1 << 3))
                width |= 1 << 9;
        width++;
        width <<= 3;

#ifdef SIS_DEBUG
        printf("height %d width %d\n", height, width);
#endif

        fbaddr = sisfb_crtc_read(fb, CRTC_STARTADRL) |
            (sisfb_crtc_read(fb, CRTC_STARTADRH) << 8) |
            (sisfb_seq_read(fb, 0x0d) << 16) |
            ((sisfb_seq_read(fb, 0x37) & 0x03) << 24);
        fbaddr <<= 2;
#ifdef SIS_DEBUG
        printf("FBADDR %lx\n", fbaddr);
#endif

        tmp = sisfb_seq_read(fb, 0x06);
        switch (tmp & 0x1c) {
        case 0x00:
                bpp = 8;
                break;
        case 0x04:
                bpp = 15;
                break;
        case 0x08:
                bpp = 16;
                break;
        case 0x10:
                bpp = 32;
                break;
        default:
                aprint_error("unknown bpp for 0x%x\n", tmp);
                return EINVAL;
        }
#ifdef SIS_DEBUG
        printf("BPP %d\n", bpp);
#endif

        fb->fb_width = ri->ri_width = width;
        fb->fb_height = ri->ri_height = height;
        fb->fb_depth = ri->ri_depth = bpp;
        fb->fb_stride = ri->ri_stride = (ri->ri_width * ri->ri_depth) / 8;
        ri->ri_flg = /* RI_CENTER | RI_CLEAR | RI_FULLCLEAR */ RI_CENTER | RI_NO_AUTO;
        fb->fb_addr = ri->ri_bits =
            (void *)((char *)bus_space_vaddr(fb->fbt, fb->fbh) + fbaddr);
        ri->ri_hw = fb;

#ifdef SIS_DEBUG
        printf("ri_bits %p\n", ri->ri_bits);
#endif

#ifdef __MIPSEL__
        /* swap B and R */
        switch (bpp) {
        case 15:
                ri->ri_rnum = 5;
                ri->ri_rpos = 10;
                ri->ri_gnum = 5;
                ri->ri_gpos = 5;
                ri->ri_bnum = 5;
                ri->ri_bpos = 0;
                break;
        case 16:
                ri->ri_rnum = 5;
                ri->ri_rpos = 11;
                ri->ri_gnum = 6;
                ri->ri_gpos = 5;
                ri->ri_bnum = 5;
                ri->ri_bpos = 0;
                break;
        }
#endif

        bcopy(rasops_cmap, fb->cmap, sizeof(fb->cmap));
        if (bpp == 8) {
                sisfb_loadcmap(fb, 0, 256);
        }

        rasops_init(ri, 25, 80);
        rasops_reconfig(ri, ri->ri_height / ri->ri_font->fontheight,
            ri->ri_width / ri->ri_font->fontwidth);

        fb->wsd.name = "std";
        fb->wsd.ncols = ri->ri_cols;
        fb->wsd.nrows = ri->ri_rows;
        fb->wsd.textops = &ri->ri_ops;
        fb->wsd.fontwidth = ri->ri_font->fontwidth;
        fb->wsd.fontheight = ri->ri_font->fontheight;
        fb->wsd.capabilities = ri->ri_caps;

        return 0;
}

/*
 * Colormap handling routines.
 */

void
sisfb_loadcmap(struct sisfb *fb, int baseidx, int count)
{
        uint8_t *cmap = fb->cmap + baseidx * 3;

        bus_space_write_1(fb->iot, fb->ioh, DAC_ADDR, baseidx);
        while (count-- != 0) {
                bus_space_write_1(fb->iot, fb->ioh, DAC_DATA, *cmap++ >> 2);
                bus_space_write_1(fb->iot, fb->ioh, DAC_DATA, *cmap++ >> 2);
                bus_space_write_1(fb->iot, fb->ioh, DAC_DATA, *cmap++ >> 2);
        }
}

int
sisfb_getcmap(uint8_t *cmap, struct wsdisplay_cmap *cm)
{
        uint index = cm->index, count = cm->count, i;
        uint8_t ramp[256], *dst, *src;
        int rc;

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

        index *= 3;

        src = cmap + index;
        dst = ramp;
        for (i = 0; i < count; i++)
                *dst++ = *src, src += 3;
        for (; i < sizeof(ramp); i++)
                *dst++ = 0;
        rc = copyout(ramp, cm->red, count);
        if (rc != 0)
                return rc;

        src = cmap + index + 1;
        dst = ramp;
        for (i = 0; i < count; i++)
                *dst++ = *src, src += 3;
        rc = copyout(ramp, cm->green, count);
        if (rc != 0)
                return rc;

        src = cmap + index + 2;
        dst = ramp;
        for (i = 0; i < count; i++)
                *dst++ = *src, src += 3;
        rc = copyout(ramp, cm->blue, count);
        if (rc != 0)
                return rc;

        return 0;
}

int
sisfb_putcmap(uint8_t *cmap, struct wsdisplay_cmap *cm)
{
        uint index = cm->index, count = cm->count, i;
        uint8_t ramp[256], *dst, *src;
        int rc;

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

        index *= 3;

        rc = copyin(cm->red, ramp, count);
        if (rc != 0)
                return rc;
        dst = cmap + index;
        src = ramp;
        for (i = 0; i < count; i++)
                *dst = *src++, dst += 3;

        rc = copyin(cm->green, ramp, count);
        if (rc != 0)
                return rc;
        dst = cmap + index + 1;
        src = ramp;
        for (i = 0; i < count; i++)
                *dst = *src++, dst += 3;

        rc = copyin(cm->blue, ramp, count);
        if (rc != 0)
                return rc;
        dst = cmap + index + 2;
        src = ramp;
        for (i = 0; i < count; i++)
                *dst = *src++, dst += 3;

        return 0;
}

/*
 * Early console code
 */

int
sisfb_cnattach(bus_space_tag_t memt, bus_space_tag_t iot,
    pci_chipset_tag_t pc, pcitag_t tag, pcireg_t id)
{
        long defattr;
        struct rasops_info * const ri = &sisfbcn.vcs.scr_ri;
        int flags;
        int rc;

        /* filter out unrecognized devices */
        switch (id) {
        default:
                return ENODEV;
        case PCI_ID_CODE(PCI_VENDOR_SIS, PCI_PRODUCT_SIS_315PRO_VGA):
                break;
        }

        if (pci_mapreg_info(pc, tag, PCI_MAPREG_START,
            PCI_MAPREG_TYPE_MEM,
            &sisfbcn.fbbase, &sisfbcn.fbsize, &flags)) {
                printf("sisfb can't map frame buffer\n");
                return ENODEV;
        }

        sisfbcn.fbt = memt;
        rc = bus_space_map(memt, sisfbcn.fbbase, sisfbcn.fbsize,
            BUS_SPACE_MAP_LINEAR, &sisfbcn.fbh);
#ifdef SIS_DEBUG
        printf("sisfb_cnattach(memt, 0x%x rc %d\n", PCI_MAPREG_MEM_ADDR(bar), rc);
#endif
        if (rc != 0)
                return rc;

        if (pci_mapreg_info(pc, tag, PCI_MAPREG_START + 4,
            PCI_MAPREG_TYPE_MEM,
            &sisfbcn.mmiobase, &sisfbcn.mmiosize, &flags)) {
                printf("sisfb can't map mem space\n");
                return ENODEV;
        }
        sisfbcn.mmiot = memt;
        rc = bus_space_map(memt, sisfbcn.mmiobase, sisfbcn.mmiosize,
            BUS_SPACE_MAP_LINEAR, &sisfbcn.mmioh);
#ifdef SIS_DEBUG
        printf("sisfb_cnattach(memt2, 0x%x rc %d\n", PCI_MAPREG_MEM_ADDR(bar), rc);
#endif
        if (rc != 0)
                return rc;

        if (pci_mapreg_info(pc, tag, PCI_MAPREG_START + 8,
            PCI_MAPREG_TYPE_IO,
            &sisfbcn.iobase, &sisfbcn.iosize, &flags)) {
                printf("sisfb can't map mem space\n");
                return ENODEV;
        }
        sisfbcn.iot = iot;
        rc = bus_space_map(iot, sisfbcn.iobase, sisfbcn.iosize,
            0, &sisfbcn.ioh);
#ifdef SIS_DEBUG
        printf("sisfb_cnattach(iot, 0x%x rc %d\n", PCI_MAPREG_MEM_ADDR(bar), rc);
#endif
        if (rc != 0)
                return rc;

        rc = sisfb_setup(&sisfbcn);
#ifdef SIS_DEBUG
        printf("sisfb_setup %d %p\n", rc, sisfbcn.vcs.scr_ri.ri_hw);
#endif
        if (rc != 0)
                return rc;

        ri->ri_ops.allocattr(ri, 0,  ri->ri_rows - 1, 0, &defattr);
        wsdisplay_preattach(&sisfbcn.wsd, ri, 0, 0, defattr);

        return 0;
}