/* $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 <[email protected]>.
*
* 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;
       }
}

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