/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2003 Peter Grehan
 * 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 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 AUTHOR 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/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/limits.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/fbio.h>
#include <sys/consio.h>

#include <machine/bus.h>
#include <machine/sc_machdep.h>
#include <machine/vm.h>

#include <sys/rman.h>

#include <dev/fb/fbreg.h>
#include <dev/syscons/syscons.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_pci.h>
#include <powerpc/ofw/ofw_syscons.h>

static int ofwfb_ignore_mmap_checks = 1;
static int ofwfb_reset_on_switch = 1;
static SYSCTL_NODE(_hw, OID_AUTO, ofwfb, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "ofwfb");
SYSCTL_INT(_hw_ofwfb, OID_AUTO, relax_mmap, CTLFLAG_RW,
    &ofwfb_ignore_mmap_checks, 0, "relaxed mmap bounds checking");
SYSCTL_INT(_hw_ofwfb, OID_AUTO, reset_on_mode_switch, CTLFLAG_RW,
    &ofwfb_reset_on_switch, 0, "reset the framebuffer driver on mode switch");

extern u_char dflt_font_16[];
extern u_char dflt_font_14[];
extern u_char dflt_font_8[];

static int ofwfb_configure(int flags);

static vi_probe_t ofwfb_probe;
static vi_init_t ofwfb_init;
static vi_get_info_t ofwfb_get_info;
static vi_query_mode_t ofwfb_query_mode;
static vi_set_mode_t ofwfb_set_mode;
static vi_save_font_t ofwfb_save_font;
static vi_load_font_t ofwfb_load_font;
static vi_show_font_t ofwfb_show_font;
static vi_save_palette_t ofwfb_save_palette;
static vi_load_palette_t ofwfb_load_palette;
static vi_set_border_t ofwfb_set_border;
static vi_save_state_t ofwfb_save_state;
static vi_load_state_t ofwfb_load_state;
static vi_set_win_org_t ofwfb_set_win_org;
static vi_read_hw_cursor_t ofwfb_read_hw_cursor;
static vi_set_hw_cursor_t ofwfb_set_hw_cursor;
static vi_set_hw_cursor_shape_t ofwfb_set_hw_cursor_shape;
static vi_blank_display_t ofwfb_blank_display;
static vi_mmap_t ofwfb_mmap;
static vi_ioctl_t ofwfb_ioctl;
static vi_clear_t ofwfb_clear;
static vi_fill_rect_t ofwfb_fill_rect;
static vi_bitblt_t ofwfb_bitblt;
static vi_diag_t ofwfb_diag;
static vi_save_cursor_palette_t ofwfb_save_cursor_palette;
static vi_load_cursor_palette_t ofwfb_load_cursor_palette;
static vi_copy_t ofwfb_copy;
static vi_putp_t ofwfb_putp;
static vi_putc_t ofwfb_putc;
static vi_puts_t ofwfb_puts;
static vi_putm_t ofwfb_putm;

static video_switch_t ofwfbvidsw = {
        .probe                  = ofwfb_probe,
        .init                   = ofwfb_init,
        .get_info               = ofwfb_get_info,
        .query_mode             = ofwfb_query_mode,
        .set_mode               = ofwfb_set_mode,
        .save_font              = ofwfb_save_font,
        .load_font              = ofwfb_load_font,
        .show_font              = ofwfb_show_font,
        .save_palette           = ofwfb_save_palette,
        .load_palette           = ofwfb_load_palette,
        .set_border             = ofwfb_set_border,
        .save_state             = ofwfb_save_state,
        .load_state             = ofwfb_load_state,
        .set_win_org            = ofwfb_set_win_org,
        .read_hw_cursor         = ofwfb_read_hw_cursor,
        .set_hw_cursor          = ofwfb_set_hw_cursor,
        .set_hw_cursor_shape    = ofwfb_set_hw_cursor_shape,
        .blank_display          = ofwfb_blank_display,
        .mmap                   = ofwfb_mmap,
        .ioctl                  = ofwfb_ioctl,
        .clear                  = ofwfb_clear,
        .fill_rect              = ofwfb_fill_rect,
        .bitblt                 = ofwfb_bitblt,
        .diag                   = ofwfb_diag,
        .save_cursor_palette    = ofwfb_save_cursor_palette,
        .load_cursor_palette    = ofwfb_load_cursor_palette,
        .copy                   = ofwfb_copy,
        .putp                   = ofwfb_putp,
        .putc                   = ofwfb_putc,
        .puts                   = ofwfb_puts,
        .putm                   = ofwfb_putm,
};

/*
 * bitmap depth-specific routines
 */
static vi_blank_display_t ofwfb_blank_display8;
static vi_putc_t ofwfb_putc8;
static vi_putm_t ofwfb_putm8;
static vi_set_border_t ofwfb_set_border8;

static vi_blank_display_t ofwfb_blank_display32;
static vi_putc_t ofwfb_putc32;
static vi_putm_t ofwfb_putm32;
static vi_set_border_t ofwfb_set_border32;

VIDEO_DRIVER(ofwfb, ofwfbvidsw, ofwfb_configure);

extern sc_rndr_sw_t txtrndrsw;
RENDERER(ofwfb, 0, txtrndrsw, gfb_set);

RENDERER_MODULE(ofwfb, gfb_set);

/*
 * Define the iso6429-1983 colormap
 */
static struct {
        uint8_t red;
        uint8_t green;
        uint8_t blue;
} ofwfb_cmap[16] = {            /*  #     R    G    B   Color */
                                /*  -     -    -    -   ----- */
        { 0x00, 0x00, 0x00 },   /*  0     0    0    0   Black */
        { 0x00, 0x00, 0xaa },   /*  1     0    0  2/3   Blue  */
        { 0x00, 0xaa, 0x00 },   /*  2     0  2/3    0   Green */
        { 0x00, 0xaa, 0xaa },   /*  3     0  2/3  2/3   Cyan  */
        { 0xaa, 0x00, 0x00 },   /*  4   2/3    0    0   Red   */
        { 0xaa, 0x00, 0xaa },   /*  5   2/3    0  2/3   Magenta */
        { 0xaa, 0x55, 0x00 },   /*  6   2/3  1/3    0   Brown */
        { 0xaa, 0xaa, 0xaa },   /*  7   2/3  2/3  2/3   White */
        { 0x55, 0x55, 0x55 },   /*  8   1/3  1/3  1/3   Gray  */
        { 0x55, 0x55, 0xff },   /*  9   1/3  1/3    1   Bright Blue  */
        { 0x55, 0xff, 0x55 },   /* 10   1/3    1  1/3   Bright Green */
        { 0x55, 0xff, 0xff },   /* 11   1/3    1    1   Bright Cyan  */
        { 0xff, 0x55, 0x55 },   /* 12     1  1/3  1/3   Bright Red   */
        { 0xff, 0x55, 0xff },   /* 13     1  1/3    1   Bright Magenta */
        { 0xff, 0xff, 0x80 },   /* 14     1    1  1/3   Bright Yellow */
        { 0xff, 0xff, 0xff }    /* 15     1    1    1   Bright White */
};

#define TODO    printf("%s: unimplemented\n", __func__)

static u_int16_t ofwfb_static_window[ROW*COL];

static struct ofwfb_softc ofwfb_softc;

static __inline int
ofwfb_background(uint8_t attr)
{
        return (attr >> 4);
}

static __inline int
ofwfb_foreground(uint8_t attr)
{
        return (attr & 0x0f);
}

static u_int
ofwfb_pix32(struct ofwfb_softc *sc, int attr)
{
        u_int retval;

        if (sc->sc_tag == &bs_le_tag)
                retval = (ofwfb_cmap[attr].red << 16) |
                        (ofwfb_cmap[attr].green << 8) |
                        ofwfb_cmap[attr].blue;
        else
                retval = (ofwfb_cmap[attr].blue  << 16) |
                        (ofwfb_cmap[attr].green << 8) |
                        ofwfb_cmap[attr].red;

        return (retval);
}

static int
ofwfb_configure(int flags)
{
        struct ofwfb_softc *sc;
        phandle_t chosen;
        ihandle_t stdout;
        phandle_t node;
        uint32_t fb_phys;
        int depth;
        int disable;
        int len;
        int i;
        char type[16];
        static int done = 0;

        disable = 0;
        TUNABLE_INT_FETCH("hw.syscons.disable", &disable);
        if (disable != 0)
                return (0);

        if (done != 0)
                return (0);
        done = 1;

        sc = &ofwfb_softc;

        chosen = OF_finddevice("/chosen");
        OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
        node = OF_instance_to_package(stdout);
        if (node == -1) {
                /*
                 * The "/chosen/stdout" does not exist try
                 * using "screen" directly.
                 */
                node = OF_finddevice("screen");
        }
        OF_getprop(node, "device_type", type, sizeof(type));
        if (strcmp(type, "display") != 0)
                return (0);

        /* Only support 8 and 32-bit framebuffers */
        OF_getprop(node, "depth", &depth, sizeof(depth));
        if (depth == 8) {
                sc->sc_blank = ofwfb_blank_display8;
                sc->sc_putc = ofwfb_putc8;
                sc->sc_putm = ofwfb_putm8;
                sc->sc_set_border = ofwfb_set_border8;
        } else if (depth == 32) {
                sc->sc_blank = ofwfb_blank_display32;
                sc->sc_putc = ofwfb_putc32;
                sc->sc_putm = ofwfb_putm32;
                sc->sc_set_border = ofwfb_set_border32;
        } else
                return (0);

        if (OF_getproplen(node, "height") != sizeof(sc->sc_height) ||
            OF_getproplen(node, "width") != sizeof(sc->sc_width) ||
            OF_getproplen(node, "linebytes") != sizeof(sc->sc_stride))
                return (0);

        sc->sc_depth = depth;
        sc->sc_node = node;
        sc->sc_console = 1;
        OF_getprop(node, "height", &sc->sc_height, sizeof(sc->sc_height));
        OF_getprop(node, "width", &sc->sc_width, sizeof(sc->sc_width));
        OF_getprop(node, "linebytes", &sc->sc_stride, sizeof(sc->sc_stride));

        /*
         * Get the PCI addresses of the adapter. The node may be the
         * child of the PCI device: in that case, try the parent for
         * the assigned-addresses property.
         */
        len = OF_getprop(node, "assigned-addresses", sc->sc_pciaddrs,
                  sizeof(sc->sc_pciaddrs));
        if (len == -1) {
                len = OF_getprop(OF_parent(node), "assigned-addresses",
                    sc->sc_pciaddrs, sizeof(sc->sc_pciaddrs));
        }
        if (len == -1)
                len = 0;
        sc->sc_num_pciaddrs = len / sizeof(struct ofw_pci_register);

        /*
         * Grab the physical address of the framebuffer, and then map it
         * into our memory space. If the MMU is not yet up, it will be
         * remapped for us when relocation turns on.
         *
         * XXX We assume #address-cells is 1 at this point.
         */
        if (OF_getproplen(node, "address") == sizeof(fb_phys)) {
                OF_getprop(node, "address", &fb_phys, sizeof(fb_phys));
                sc->sc_tag = &bs_be_tag;
                bus_space_map(sc->sc_tag, fb_phys, sc->sc_height *
                    sc->sc_stride, BUS_SPACE_MAP_PREFETCHABLE, &sc->sc_addr);
        } else {
                /*
                 * Some IBM systems don't have an address property. Try to
                 * guess the framebuffer region from the assigned addresses.
                 * This is ugly, but there doesn't seem to be an alternative.
                 * Linux does the same thing.
                 */

                fb_phys = sc->sc_num_pciaddrs;
                for (i = 0; i < sc->sc_num_pciaddrs; i++) {
                        /* If it is too small, not the framebuffer */
                        if (sc->sc_pciaddrs[i].size_lo <
                            sc->sc_stride*sc->sc_height)
                                continue;
                        /* If it is not memory, it isn't either */
                        if (!(sc->sc_pciaddrs[i].phys_hi &
                            OFW_PCI_PHYS_HI_SPACE_MEM32))
                                continue;

                        /* This could be the framebuffer */
                        fb_phys = i;

                        /* If it is prefetchable, it certainly is */
                        if (sc->sc_pciaddrs[i].phys_hi &
                            OFW_PCI_PHYS_HI_PREFETCHABLE)
                                break;
                }
                if (fb_phys == sc->sc_num_pciaddrs)
                        return (0);

                OF_decode_addr(node, fb_phys, &sc->sc_tag, &sc->sc_addr, NULL);
        }

        ofwfb_init(0, &sc->sc_va, 0);

        return (0);
}

static int
ofwfb_probe(int unit, video_adapter_t **adp, void *arg, int flags)
{
        TODO;
        return (0);
}

static int
ofwfb_init(int unit, video_adapter_t *adp, int flags)
{
        struct ofwfb_softc *sc;
        video_info_t *vi;
        int cborder;
        int font_height;

        sc = (struct ofwfb_softc *)adp;
        vi = &adp->va_info;

        vid_init_struct(adp, "ofwfb", -1, unit);

        /* The default font size can be overridden by loader */
        font_height = 16;
        TUNABLE_INT_FETCH("hw.syscons.fsize", &font_height);
        if (font_height == 8) {
                sc->sc_font = dflt_font_8;
                sc->sc_font_height = 8;
        } else if (font_height == 14) {
                sc->sc_font = dflt_font_14;
                sc->sc_font_height = 14;
        } else {
                /* default is 8x16 */
                sc->sc_font = dflt_font_16;
                sc->sc_font_height = 16;
        }

        /* The user can set a border in chars - default is 1 char width */
        cborder = 1;
        TUNABLE_INT_FETCH("hw.syscons.border", &cborder);

        vi->vi_cheight = sc->sc_font_height;
        vi->vi_width = sc->sc_width/8 - 2*cborder;
        vi->vi_height = sc->sc_height/sc->sc_font_height - 2*cborder;
        vi->vi_cwidth = 8;

        /*
         * Clamp width/height to syscons maximums
         */
        if (vi->vi_width > COL)
                vi->vi_width = COL;
        if (vi->vi_height > ROW)
                vi->vi_height = ROW;

        sc->sc_xmargin = (sc->sc_width - (vi->vi_width * vi->vi_cwidth)) / 2;
        sc->sc_ymargin = (sc->sc_height - (vi->vi_height * vi->vi_cheight))/2;

        /*
         * Avoid huge amounts of conditional code in syscons by
         * defining a dummy h/w text display buffer.
         */
        adp->va_window = (vm_offset_t) ofwfb_static_window;

        /*
         * Enable future font-loading and flag color support, as well as
         * adding V_ADP_MODECHANGE so that we ofwfb_set_mode() gets called
         * when the X server shuts down. This enables us to get the console
         * back when X disappears.
         */
        adp->va_flags |= V_ADP_FONT | V_ADP_COLOR | V_ADP_MODECHANGE;

        ofwfb_set_mode(&sc->sc_va, 0);

        vid_register(&sc->sc_va);

        return (0);
}

static int
ofwfb_get_info(video_adapter_t *adp, int mode, video_info_t *info)
{
        bcopy(&adp->va_info, info, sizeof(*info));
        return (0);
}

static int
ofwfb_query_mode(video_adapter_t *adp, video_info_t *info)
{
        TODO;
        return (0);
}

static int
ofwfb_set_mode(video_adapter_t *adp, int mode)
{
        struct ofwfb_softc *sc;
        char name[64];
        ihandle_t ih;
        int i, retval;

        sc = (struct ofwfb_softc *)adp;

        if (ofwfb_reset_on_switch) {
                /*
                 * Open the display device, which will initialize it.
                 */

                memset(name, 0, sizeof(name));
                OF_package_to_path(sc->sc_node, name, sizeof(name));
                ih = OF_open(name);

                if (sc->sc_depth == 8) {
                        /*
                         * Install the ISO6429 colormap - older OFW systems
                         * don't do this by default
                         */
                        for (i = 0; i < 16; i++) {
                                OF_call_method("color!", ih, 4, 1,
                                                   ofwfb_cmap[i].red,
                                                   ofwfb_cmap[i].green,
                                                   ofwfb_cmap[i].blue,
                                                   i,
                                                   &retval);
                        }
                }
        }

        ofwfb_blank_display(&sc->sc_va, V_DISPLAY_ON);

        return (0);
}

static int
ofwfb_save_font(video_adapter_t *adp, int page, int size, int width,
    u_char *data, int c, int count)
{
        TODO;
        return (0);
}

static int
ofwfb_load_font(video_adapter_t *adp, int page, int size, int width,
    u_char *data, int c, int count)
{
        struct ofwfb_softc *sc;

        sc = (struct ofwfb_softc *)adp;

        /*
         * syscons code has already determined that current width/height
         * are unchanged for this new font
         */
        sc->sc_font = data;
        return (0);
}

static int
ofwfb_show_font(video_adapter_t *adp, int page)
{

        return (0);
}

static int
ofwfb_save_palette(video_adapter_t *adp, u_char *palette)
{
        /* TODO; */
        return (0);
}

static int
ofwfb_load_palette(video_adapter_t *adp, u_char *palette)
{
        /* TODO; */
        return (0);
}

static int
ofwfb_set_border8(video_adapter_t *adp, int border)
{
        struct ofwfb_softc *sc;
        int i, j;
        uint8_t *addr;
        uint8_t bground;

        sc = (struct ofwfb_softc *)adp;

        bground = ofwfb_background(border);

        /* Set top margin */
        addr = (uint8_t *) sc->sc_addr;
        for (i = 0; i < sc->sc_ymargin; i++) {
                for (j = 0; j < sc->sc_width; j++) {
                        *(addr + j) = bground;
                }
                addr += sc->sc_stride;
        }

        /* bottom margin */
        addr = (uint8_t *) sc->sc_addr + (sc->sc_height - sc->sc_ymargin)*sc->sc_stride;
        for (i = 0; i < sc->sc_ymargin; i++) {
                for (j = 0; j < sc->sc_width; j++) {
                        *(addr + j) = bground;
                }
                addr += sc->sc_stride;
        }

        /* remaining left and right borders */
        addr = (uint8_t *) sc->sc_addr + sc->sc_ymargin*sc->sc_stride;
        for (i = 0; i < sc->sc_height - 2*sc->sc_xmargin; i++) {
                for (j = 0; j < sc->sc_xmargin; j++) {
                        *(addr + j) = bground;
                        *(addr + j + sc->sc_width - sc->sc_xmargin) = bground;
                }
                addr += sc->sc_stride;
        }

        return (0);
}

static int
ofwfb_set_border32(video_adapter_t *adp, int border)
{
        /* XXX Be lazy for now and blank entire screen */
        return (ofwfb_blank_display32(adp, border));
}

static int
ofwfb_set_border(video_adapter_t *adp, int border)
{
        struct ofwfb_softc *sc;

        sc = (struct ofwfb_softc *)adp;

        return ((*sc->sc_set_border)(adp, border));
}

static int
ofwfb_save_state(video_adapter_t *adp, void *p, size_t size)
{
        TODO;
        return (0);
}

static int
ofwfb_load_state(video_adapter_t *adp, void *p)
{
        TODO;
        return (0);
}

static int
ofwfb_set_win_org(video_adapter_t *adp, off_t offset)
{
        TODO;
        return (0);
}

static int
ofwfb_read_hw_cursor(video_adapter_t *adp, int *col, int *row)
{
        *col = 0;
        *row = 0;

        return (0);
}

static int
ofwfb_set_hw_cursor(video_adapter_t *adp, int col, int row)
{

        return (0);
}

static int
ofwfb_set_hw_cursor_shape(video_adapter_t *adp, int base, int height,
    int celsize, int blink)
{
        return (0);
}

static int
ofwfb_blank_display8(video_adapter_t *adp, int mode)
{
        struct ofwfb_softc *sc;
        int i;
        uint32_t *addr;
        uint32_t color;
        uint32_t end;

        sc = (struct ofwfb_softc *)adp;
        addr = (uint32_t *) sc->sc_addr;
        end = (sc->sc_stride/4) * sc->sc_height;

        /* Splat 4 pixels at once. */
        color = (ofwfb_background(SC_NORM_ATTR) << 24) |
            (ofwfb_background(SC_NORM_ATTR) << 16) |
            (ofwfb_background(SC_NORM_ATTR) << 8) |
            (ofwfb_background(SC_NORM_ATTR));

        for (i = 0; i < end; i++)
                *(addr + i) = color;

        return (0);
}

static int
ofwfb_blank_display32(video_adapter_t *adp, int mode)
{
        struct ofwfb_softc *sc;
        int i;
        uint32_t *addr, blank;

        sc = (struct ofwfb_softc *)adp;
        addr = (uint32_t *) sc->sc_addr;
        blank = ofwfb_pix32(sc, ofwfb_background(SC_NORM_ATTR));

        for (i = 0; i < (sc->sc_stride/4)*sc->sc_height; i++)
                *(addr + i) = blank;

        return (0);
}

static int
ofwfb_blank_display(video_adapter_t *adp, int mode)
{
        struct ofwfb_softc *sc;

        sc = (struct ofwfb_softc *)adp;

        return ((*sc->sc_blank)(adp, mode));
}

static int
ofwfb_mmap(video_adapter_t *adp, vm_ooffset_t offset, vm_paddr_t *paddr,
    int prot, vm_memattr_t *memattr)
{
        struct ofwfb_softc *sc;
        int i;

        sc = (struct ofwfb_softc *)adp;

        /*
         * Make sure the requested address lies within the PCI device's
         * assigned addrs
         */
        for (i = 0; i < sc->sc_num_pciaddrs; i++)
          if (offset >= sc->sc_pciaddrs[i].phys_lo &&
            offset < (sc->sc_pciaddrs[i].phys_lo + sc->sc_pciaddrs[i].size_lo))
                {
                        /*
                         * If this is a prefetchable BAR, we can (and should)
                         * enable write-combining.
                         */
                        if (sc->sc_pciaddrs[i].phys_hi &
                            OFW_PCI_PHYS_HI_PREFETCHABLE)
                                *memattr = VM_MEMATTR_WRITE_COMBINING;

                        *paddr = offset;
                        return (0);
                }

        /*
         * Hack for Radeon...
         */
        if (ofwfb_ignore_mmap_checks) {
                *paddr = offset;
                return (0);
        }

        /*
         * This might be a legacy VGA mem request: if so, just point it at the
         * framebuffer, since it shouldn't be touched
         */
        if (offset < sc->sc_stride*sc->sc_height) {
                *paddr = sc->sc_addr + offset;
                return (0);
        }

        /*
         * Error if we didn't have a better idea.
         */
        if (sc->sc_num_pciaddrs == 0)
                return (ENOMEM);

        return (EINVAL);
}

static int
ofwfb_ioctl(video_adapter_t *adp, u_long cmd, caddr_t data)
{

        return (0);
}

static int
ofwfb_clear(video_adapter_t *adp)
{
        TODO;
        return (0);
}

static int
ofwfb_fill_rect(video_adapter_t *adp, int val, int x, int y, int cx, int cy)
{
        TODO;
        return (0);
}

static int
ofwfb_bitblt(video_adapter_t *adp, ...)
{
        TODO;
        return (0);
}

static int
ofwfb_diag(video_adapter_t *adp, int level)
{
        TODO;
        return (0);
}

static int
ofwfb_save_cursor_palette(video_adapter_t *adp, u_char *palette)
{
        TODO;
        return (0);
}

static int
ofwfb_load_cursor_palette(video_adapter_t *adp, u_char *palette)
{
        TODO;
        return (0);
}

static int
ofwfb_copy(video_adapter_t *adp, vm_offset_t src, vm_offset_t dst, int n)
{
        TODO;
        return (0);
}

static int
ofwfb_putp(video_adapter_t *adp, vm_offset_t off, uint32_t p, uint32_t a,
    int size, int bpp, int bit_ltor, int byte_ltor)
{
        TODO;
        return (0);
}

static int
ofwfb_putc8(video_adapter_t *adp, vm_offset_t off, uint8_t c, uint8_t a)
{
        struct ofwfb_softc *sc;
        int row;
        int col;
        int i;
        uint32_t *addr;
        u_char *p, fg, bg;
        union {
                uint32_t l;
                uint8_t  c[4];
        } ch1, ch2;

        sc = (struct ofwfb_softc *)adp;
        row = (off / adp->va_info.vi_width) * adp->va_info.vi_cheight;
        col = (off % adp->va_info.vi_width) * adp->va_info.vi_cwidth;
        p = sc->sc_font + c*sc->sc_font_height;
        addr = (u_int32_t *)((uintptr_t)sc->sc_addr
                + (row + sc->sc_ymargin)*sc->sc_stride
                + col + sc->sc_xmargin);

        fg = ofwfb_foreground(a);
        bg = ofwfb_background(a);

        for (i = 0; i < sc->sc_font_height; i++) {
                u_char fline = p[i];

                /*
                 * Assume that there is more background than foreground
                 * in characters and init accordingly
                 */
                ch1.l = ch2.l = (bg << 24) | (bg << 16) | (bg << 8) | bg;

                /*
                 * Calculate 2 x 4-chars at a time, and then
                 * write these out.
                 */
                if (fline & 0x80) ch1.c[0] = fg;
                if (fline & 0x40) ch1.c[1] = fg;
                if (fline & 0x20) ch1.c[2] = fg;
                if (fline & 0x10) ch1.c[3] = fg;

                if (fline & 0x08) ch2.c[0] = fg;
                if (fline & 0x04) ch2.c[1] = fg;
                if (fline & 0x02) ch2.c[2] = fg;
                if (fline & 0x01) ch2.c[3] = fg;

                addr[0] = ch1.l;
                addr[1] = ch2.l;
                addr += (sc->sc_stride / sizeof(u_int32_t));
        }

        return (0);
}

static int
ofwfb_putc32(video_adapter_t *adp, vm_offset_t off, uint8_t c, uint8_t a)
{
        struct ofwfb_softc *sc;
        int row;
        int col;
        int i, j, k;
        uint32_t *addr, fg, bg;
        u_char *p;

        sc = (struct ofwfb_softc *)adp;
        row = (off / adp->va_info.vi_width) * adp->va_info.vi_cheight;
        col = (off % adp->va_info.vi_width) * adp->va_info.vi_cwidth;
        p = sc->sc_font + c*sc->sc_font_height;
        addr = (uint32_t *)sc->sc_addr
                + (row + sc->sc_ymargin)*(sc->sc_stride/4)
                + col + sc->sc_xmargin;

        fg = ofwfb_pix32(sc, ofwfb_foreground(a));
        bg = ofwfb_pix32(sc, ofwfb_background(a));

        for (i = 0; i < sc->sc_font_height; i++) {
                for (j = 0, k = 7; j < 8; j++, k--) {
                        if ((p[i] & (1 << k)) == 0)
                                *(addr + j) = bg;
                        else
                                *(addr + j) = fg;
                }
                addr += (sc->sc_stride/4);
        }

        return (0);
}

static int
ofwfb_putc(video_adapter_t *adp, vm_offset_t off, uint8_t c, uint8_t a)
{
        struct ofwfb_softc *sc;

        sc = (struct ofwfb_softc *)adp;

        return ((*sc->sc_putc)(adp, off, c, a));
}

static int
ofwfb_puts(video_adapter_t *adp, vm_offset_t off, u_int16_t *s, int len)
{
        int i;

        for (i = 0; i < len; i++) {
                ofwfb_putc(adp, off + i, s[i] & 0xff, (s[i] & 0xff00) >> 8);
        }
        return (0);
}

static int
ofwfb_putm(video_adapter_t *adp, int x, int y, uint8_t *pixel_image,
    uint32_t pixel_mask, int size, int width)
{
        struct ofwfb_softc *sc;

        sc = (struct ofwfb_softc *)adp;

        return ((*sc->sc_putm)(adp, x, y, pixel_image, pixel_mask, size,
            width));
}

static int
ofwfb_putm8(video_adapter_t *adp, int x, int y, uint8_t *pixel_image,
    uint32_t pixel_mask, int size, int width)
{
        struct ofwfb_softc *sc;
        int i, j, k;
        uint8_t *addr;
        u_char fg, bg;

        sc = (struct ofwfb_softc *)adp;
        addr = (u_int8_t *)((uintptr_t)sc->sc_addr
                + (y + sc->sc_ymargin)*sc->sc_stride
                + x + sc->sc_xmargin);

        fg = ofwfb_foreground(SC_NORM_ATTR);
        bg = ofwfb_background(SC_NORM_ATTR);

        for (i = 0; i < size && i+y < sc->sc_height - 2*sc->sc_ymargin; i++) {
                /*
                 * Calculate 2 x 4-chars at a time, and then
                 * write these out.
                 */
                for (j = 0, k = width; j < 8; j++, k--) {
                        if (x + j >= sc->sc_width - 2*sc->sc_xmargin)
                                continue;

                        if (pixel_image[i] & (1 << k))
                                addr[j] = (addr[j] == fg) ? bg : fg;
                }

                addr += (sc->sc_stride / sizeof(u_int8_t));
        }

        return (0);
}

static int
ofwfb_putm32(video_adapter_t *adp, int x, int y, uint8_t *pixel_image,
    uint32_t pixel_mask, int size, int width)
{
        struct ofwfb_softc *sc;
        int i, j, k;
        uint32_t fg, bg;
        uint32_t *addr;

        sc = (struct ofwfb_softc *)adp;
        addr = (uint32_t *)sc->sc_addr
                + (y + sc->sc_ymargin)*(sc->sc_stride/4)
                + x + sc->sc_xmargin;

        fg = ofwfb_pix32(sc, ofwfb_foreground(SC_NORM_ATTR));
        bg = ofwfb_pix32(sc, ofwfb_background(SC_NORM_ATTR));

        for (i = 0; i < size && i+y < sc->sc_height - 2*sc->sc_ymargin; i++) {
                for (j = 0, k = width; j < 8; j++, k--) {
                        if (x + j >= sc->sc_width - 2*sc->sc_xmargin)
                                continue;

                        if (pixel_image[i] & (1 << k))
                                *(addr + j) = (*(addr + j) == fg) ? bg : fg;
                }
                addr += (sc->sc_stride/4);
        }

        return (0);
}

/*
 * Define the syscons nexus device attachment
 */
static void
ofwfb_scidentify(driver_t *driver, device_t parent)
{
        device_t child;

        /*
         * Add with a priority guaranteed to make it last on
         * the device list
         */
        child = BUS_ADD_CHILD(parent, INT_MAX, SC_DRIVER_NAME, 0);
}

static int
ofwfb_scprobe(device_t dev)
{
        int error;

        device_set_desc(dev, "System console");

        error = sc_probe_unit(device_get_unit(dev),
            device_get_flags(dev) | SC_AUTODETECT_KBD);
        if (error != 0)
                return (error);

        /* This is a fake device, so make sure we added it ourselves */
        return (BUS_PROBE_NOWILDCARD);
}

static int
ofwfb_scattach(device_t dev)
{
        return (sc_attach_unit(device_get_unit(dev),
            device_get_flags(dev) | SC_AUTODETECT_KBD));
}

static device_method_t ofwfb_sc_methods[] = {
        DEVMETHOD(device_identify,      ofwfb_scidentify),
        DEVMETHOD(device_probe,         ofwfb_scprobe),
        DEVMETHOD(device_attach,        ofwfb_scattach),
        { 0, 0 }
};

static driver_t ofwfb_sc_driver = {
        SC_DRIVER_NAME,
        ofwfb_sc_methods,
        sizeof(sc_softc_t),
};

DRIVER_MODULE(ofwfb, nexus, ofwfb_sc_driver, 0, 0);

/*
 * Utility routines from <dev/fb/fbreg.h>
 */
void
ofwfb_bcopy(const void *s, void *d, size_t c)
{
        bcopy(s, d, c);
}

void
ofwfb_bzero(void *d, size_t c)
{
        bzero(d, c);
}

void
ofwfb_fillw(int pat, void *base, size_t cnt)
{
        u_int16_t *bptr = base;

        while (cnt--)
                *bptr++ = pat;
}

u_int16_t
ofwfb_readw(u_int16_t *addr)
{
        return (*addr);
}

void
ofwfb_writew(u_int16_t *addr, u_int16_t val)
{
        *addr = val;
}