/*      $NetBSD: genfb_sbus.c,v 1.14 2025/10/04 03:58:38 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.
 */

/* an SBus frontend for the generic fb console driver */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: genfb_sbus.c,v 1.14 2025/10/04 03:58:38 thorpej Exp $");

#include <sys/param.h>
#include <sys/types.h>

#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/systm.h>

#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>

#include <dev/sbus/sbusvar.h>
#include <dev/sun/fbio.h>
#include <dev/sun/fbvar.h>
#include <dev/wsfb/genfbvar.h>

struct genfb_sbus_softc {
        struct genfb_softc sc_gen;
        bus_space_tag_t sc_tag;
        paddr_t sc_paddr;
};

static int      genfb_match_sbus(device_t, cfdata_t, void *);
static void     genfb_attach_sbus(device_t, device_t, void *);
static int      genfb_ioctl_sbus(void *, void *, u_long, void *, int,
                                 struct lwp*);
static paddr_t  genfb_mmap_sbus(void *, void *, off_t, int);

CFATTACH_DECL_NEW(genfb_sbus, sizeof(struct genfb_sbus_softc),
    genfb_match_sbus, genfb_attach_sbus, NULL, NULL);

/*
 * Match a graphics device.
 */
static int
genfb_match_sbus(device_t parent, cfdata_t cf, void *aux)
{
        struct sbus_attach_args *sa = aux;

        /* if there's no address property we can't use the device */
        if (prom_getpropint(sa->sa_node, "address", -1) == -1)
                return 0;
        if (strcmp("display", prom_getpropstring(sa->sa_node, "device_type"))
            == 0)
                return 1;

        return 0;
}

/*
 * Attach a display.  We need to notice if it is the console, too.
 */
static void
genfb_attach_sbus(device_t parent, device_t self, void *args)
{
        struct genfb_sbus_softc *sc = device_private(self);
        struct sbus_attach_args *sa = args;
        static const struct genfb_ops zero_ops;
        struct genfb_ops ops = zero_ops;
        bus_space_handle_t bh;
        paddr_t fbpa;
        vaddr_t fbva;
        int node = sa->sa_node;

        aprint_normal("\n");
        sc->sc_gen.sc_dev = self;
        /* Remember cookies for genfb_mmap_sbus() */
        sc->sc_tag = sa->sa_bustag;
        sc->sc_paddr = sbus_bus_addr(sa->sa_bustag, sa->sa_slot, sa->sa_offset);

        /* read geometry information from the device tree */
        sc->sc_gen.sc_width = prom_getpropint(sa->sa_node, "width", 1152);
        sc->sc_gen.sc_height = prom_getpropint(sa->sa_node, "height", 900);
        sc->sc_gen.sc_depth = prom_getpropint(sa->sa_node, "depth", 8);
        sc->sc_gen.sc_stride = prom_getpropint(sa->sa_node, "linebytes",
            (sc->sc_gen.sc_width * sc->sc_gen.sc_depth + 7) >> 3 );
        sc->sc_gen.sc_fbsize = sc->sc_gen.sc_height * sc->sc_gen.sc_stride;
        fbva = (uint32_t)prom_getpropint(sa->sa_node, "address", 0);
        if (fbva == 0)
                panic("this fb has no address property\n");
        aprint_normal_dev(self, "%d x %d at %d bit\n",
            sc->sc_gen.sc_width, sc->sc_gen.sc_height, sc->sc_gen.sc_depth);

        pmap_extract(pmap_kernel(), fbva, &fbpa);
        sc->sc_gen.sc_fboffset = (fbpa & 0x01ffffff) - 
            (sc->sc_paddr & 0x01ffffff);
        aprint_normal_dev(self, "framebuffer at offset 0x%x\n",
            (uint32_t)sc->sc_gen.sc_fboffset);

#if notyet
        if (sc->sc_gen.sc_depth <= 8) {
                /* setup some ANSIish colour map */
                char boo[256];
                snprintf(boo, 256, "\" pal!\" %x %x %x %x %x call",
                    sa->sa_node, 0, 0xa0, 0xa0, 0);
                prom_interpret(boo);
        }
#endif

        device_setprop_bool(self, "is_console", fb_is_console(node));

        if (sbus_bus_map(sa->sa_bustag,
                         sa->sa_slot,
                         sa->sa_offset + sc->sc_gen.sc_fboffset,
                         sc->sc_gen.sc_fbsize,
                         BUS_SPACE_MAP_LINEAR, &bh) != 0) {
                aprint_error_dev(self, "cannot map framebuffer\n");
                return;
        }
        sc->sc_gen.sc_fbaddr = (void *)bus_space_vaddr(sa->sa_bustag, bh);

        ops.genfb_ioctl = genfb_ioctl_sbus;
        ops.genfb_mmap = genfb_mmap_sbus;

        genfb_attach(&sc->sc_gen, &ops);
}

static int
genfb_ioctl_sbus(void *v, void *vs, u_long cmd, void *data, int flag,
    struct lwp *l)
{

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

        return EPASSTHROUGH;
}

static paddr_t
genfb_mmap_sbus(void *v, void *vs, off_t offset, int prot)
{
        struct genfb_sbus_softc *sc = v;

        /* regular fb mapping at 0 */
        if ((offset >= 0) && (offset < sc->sc_gen.sc_fbsize)) {

                return bus_space_mmap(sc->sc_tag, sc->sc_paddr,
                    sc->sc_gen.sc_fboffset + offset, prot,
                    BUS_SPACE_MAP_LINEAR);
        }

        return -1;
}