/* $NetBSD: virtio_acpi.c,v 1.11 2025/01/14 16:46:38 riastradh Exp $ */

/*-
 * Copyright (c) 2018 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jared McNeill <jmcneill@invisible.ca>.
 *
 * 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: virtio_acpi.c,v 1.11 2025/01/14 16:46:38 riastradh Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>

#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpi_intr.h>

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

struct virtio_acpi_softc {
        struct virtio_mmio_softc        sc_msc;
        ACPI_HANDLE                     sc_handle;
        int                             sc_irq;
        int                             sc_irqtype;
};

static int      virtio_acpi_match(device_t, cfdata_t, void *);
static void     virtio_acpi_attach(device_t, device_t, void *);
static int      virtio_acpi_rescan(device_t, const char *, const int *);
static int      virtio_acpi_detach(device_t, int);

static int      virtio_acpi_alloc_interrupts(struct virtio_mmio_softc *);
static void     virtio_acpi_free_interrupts(struct virtio_mmio_softc *);

CFATTACH_DECL3_NEW(virtio_acpi, sizeof(struct virtio_acpi_softc),
    virtio_acpi_match, virtio_acpi_attach, virtio_acpi_detach, NULL,
    virtio_acpi_rescan, NULL, 0);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "LNRO0005" },
        DEVICE_COMPAT_EOL
};

static int
virtio_acpi_match(device_t parent, cfdata_t cf, void *aux)
{
        struct acpi_attach_args *aa = aux;

        return acpi_compatible_match(aa, compat_data);
}

static void
virtio_acpi_attach(device_t parent, device_t self, void *aux)
{
        struct virtio_acpi_softc * const sc = device_private(self);
        struct virtio_mmio_softc * const msc = &sc->sc_msc;
        struct virtio_softc * const vsc = &msc->sc_sc;
        struct acpi_attach_args *aa = aux;
        struct acpi_resources res;
        struct acpi_mem *mem;
        struct acpi_irq *irq;
        ACPI_STATUS rv;
        int error;

        sc->sc_handle = aa->aa_node->ad_handle;
        msc->sc_iot = aa->aa_memt;
        vsc->sc_dev = self;

        if (BUS_DMA_TAG_VALID(aa->aa_dmat64)) {
                aprint_verbose(": using 64-bit DMA");
                vsc->sc_dmat = aa->aa_dmat64;
        } else {
                aprint_verbose(": using 32-bit DMA");
                vsc->sc_dmat = aa->aa_dmat;
        }

        rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
            &res, &acpi_resource_parse_ops_default);
        if (ACPI_FAILURE(rv))
                return;

        mem = acpi_res_mem(&res, 0);
        if (mem == NULL) {
                aprint_error_dev(self, "couldn't find mem resource\n");
                goto done;
        }

        irq = acpi_res_irq(&res, 0);
        if (irq == NULL) {
                aprint_error_dev(self, "couldn't find irq resource\n");
                goto done;
        }
        sc->sc_irq = irq->ar_irq;
        sc->sc_irqtype = (irq->ar_type == ACPI_EDGE_SENSITIVE) ? IST_EDGE : IST_LEVEL;

        error = bus_space_map(msc->sc_iot, mem->ar_base, mem->ar_length, 0, &msc->sc_ioh);
        if (error) {
                aprint_error_dev(self, "couldn't map registers\n");
                return;
        }
        msc->sc_iosize = mem->ar_length;

        msc->sc_alloc_interrupts = virtio_acpi_alloc_interrupts;
        msc->sc_free_interrupts = virtio_acpi_free_interrupts;

        virtio_mmio_common_attach(msc);
        virtio_acpi_rescan(self, "virtio", NULL);

done:
        acpi_resource_cleanup(&res);
}

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

        return virtio_mmio_common_detach(msc, flags);
}

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

        if (vsc->sc_child)
                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_acpi_alloc_interrupts(struct virtio_mmio_softc *msc)
{
        struct virtio_acpi_softc * const sc = (struct virtio_acpi_softc *)msc;
        struct virtio_softc * const vsc = &msc->sc_sc;

        msc->sc_ih = acpi_intr_establish(vsc->sc_dev,
            (uint64_t)(uintptr_t)sc->sc_handle,
            IPL_VM, false, virtio_mmio_intr, msc, device_xname(vsc->sc_dev));
        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 on irq %d\n", sc->sc_irq);

        return 0;
}

static void
virtio_acpi_free_interrupts(struct virtio_mmio_softc *msc)
{
        if (msc->sc_ih != NULL) {
                acpi_intr_disestablish(msc->sc_ih);
                msc->sc_ih = NULL;
        }
}