/*      $NetBSD: virtio_mainbus.c,v 1.2 2024/03/09 11:16:31 isaki Exp $ */

/*
 * Copyright (c) 2021, 2024 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Reinoud Zandijk and by Jason R. Thorpe.
 *
 * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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: virtio_mainbus.c,v 1.2 2024/03/09 11:16:31 isaki Exp $");

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

#include <sys/device.h>

#include <virt68k/dev/mainbusvar.h>

#define VIRTIO_PRIVATE
#include <dev/virtio/virtio_mmiovar.h>


static int      virtio_mainbus_match(device_t, cfdata_t, void *);
static void     virtio_mainbus_attach(device_t, device_t, void *);
static int      virtio_mainbus_rescan(device_t, const char *, const int *);
static int      virtio_mainbus_detach(device_t, int);

static int      virtio_mainbus_alloc_interrupts(struct virtio_mmio_softc *);
static void     virtio_mainbus_free_interrupts(struct virtio_mmio_softc *);

struct virtio_mainbus_softc {
        struct virtio_mmio_softc sc_msc;

        int              sc_irq;
};


CFATTACH_DECL3_NEW(virtio_mainbus, sizeof(struct virtio_mainbus_softc),
    virtio_mainbus_match, virtio_mainbus_attach,
    virtio_mainbus_detach, NULL,
    virtio_mainbus_rescan, (void *)voidop, 0);


static const struct device_compatible_entry compat_data[] = {
        { .compat = "virtio,mmio" },
        DEVICE_COMPAT_EOL
};


static int
virtio_mainbus_match(device_t parent, cfdata_t match, void *aux)
{
        struct mainbus_attach_args *ma = aux;

        return mainbus_compatible_match(ma, compat_data);
}


void
virtio_mainbus_attach(device_t parent, device_t self, void *aux)
{
        struct virtio_mainbus_softc *sc = device_private(self);
        struct virtio_mmio_softc *msc = &sc->sc_msc;
        struct virtio_softc *vsc = &msc->sc_sc;
        struct mainbus_attach_args *ma = aux;
        bus_space_handle_t bsh;

        if (bus_space_map(ma->ma_st, ma->ma_addr, ma->ma_size, 0, &bsh) != 0) {
                aprint_error(": can't map i/o space\n");
                return;
        }

        aprint_normal("\n");
        aprint_naive("\n");

        sc->sc_irq = ma->ma_irq;

        msc->sc_iot = ma->ma_st;
        msc->sc_ioh = bsh;
        msc->sc_iosize = ma->ma_size;
        msc->sc_alloc_interrupts = virtio_mainbus_alloc_interrupts;
        msc->sc_free_interrupts  = virtio_mainbus_free_interrupts;

        vsc->sc_dev = self;
        vsc->sc_dmat = ma->ma_dmat;
        virtio_mmio_common_attach(msc);

        virtio_mainbus_rescan(self, NULL, NULL);
}


/* ARGSUSED */
static int
virtio_mainbus_rescan(device_t self, const char *ifattr, const int *locs)
{
        struct virtio_mainbus_softc *sc = device_private(self);
        struct virtio_mmio_softc *msc = &sc->sc_msc;
        struct virtio_softc *vsc = &msc->sc_sc;
        struct virtio_attach_args va;

        if (vsc->sc_child)      /* child already attached? */
                return 0;

        memset(&va, 0, sizeof(va));
        va.sc_childdevid = vsc->sc_childdevid;

        config_found(self, &va, NULL, CFARGS_NONE);

        if (virtio_attach_failed(vsc))
                return 0;
        return 0;
}


static int
virtio_mainbus_detach(device_t self, int flags)
{
        struct virtio_mainbus_softc *sc = device_private(self);
        struct virtio_mmio_softc * const msc = &sc->sc_msc;

        return virtio_mmio_common_detach(msc, flags);
}


static int
virtio_mainbus_alloc_interrupts(struct virtio_mmio_softc *msc)
{
        struct virtio_mainbus_softc *sc = (struct virtio_mainbus_softc *) msc;
        struct virtio_softc * const vsc = &msc->sc_sc;
        char strbuf[INTR_STRING_BUFSIZE];

        msc->sc_ih = intr_establish(virtio_mmio_intr, msc,
            sc->sc_irq, IPL_VM/*XXX*/, 0);
        if (msc->sc_ih == NULL) {
                aprint_error_dev(vsc->sc_dev,
                        "couldn't install interrupt handler\n");
                return -1;
        }

        aprint_normal_dev(vsc->sc_dev, "interrupting at %s\n",
            intr_string(msc->sc_ih, strbuf, sizeof(strbuf)));

        return 0;
}


static void
virtio_mainbus_free_interrupts(struct virtio_mmio_softc *msc)
{
        if (msc->sc_ih) {
                intr_disestablish(msc->sc_ih);
                msc->sc_ih = NULL;
        }
}