/*-
 * Copyright (C) 2017 Olivier Houchard
 *
 * 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/buf.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/smp.h>

#include "nvme_private.h"

static int    nvme_ahci_probe(device_t dev);
static int    nvme_ahci_attach(device_t dev);
static int    nvme_ahci_detach(device_t dev);

static device_method_t nvme_ahci_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,     nvme_ahci_probe),
        DEVMETHOD(device_attach,    nvme_ahci_attach),
        DEVMETHOD(device_detach,    nvme_ahci_detach),
        DEVMETHOD(device_shutdown,  nvme_shutdown),
        DEVMETHOD_END
};

static driver_t nvme_ahci_driver = {
        "nvme",
        nvme_ahci_methods,
        sizeof(struct nvme_controller),
};

DRIVER_MODULE(nvme, ahci, nvme_ahci_driver, NULL, NULL);

static int
nvme_ahci_probe (device_t device)
{
        return (0);
}

static int
nvme_ahci_attach(device_t dev)
{
        struct nvme_controller*ctrlr = DEVICE2SOFTC(dev);
        int ret;

        /* Map MMIO registers */
        ctrlr->resource_id = 0;

        ctrlr->resource = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
            &ctrlr->resource_id, RF_ACTIVE);

        if(ctrlr->resource == NULL) {
                nvme_printf(ctrlr, "unable to allocate mem resource\n");
                ret = ENOMEM;
                goto bad;
        }

        /* Allocate and setup IRQ */
        ctrlr->rid = 0;
        ctrlr->res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
            &ctrlr->rid, RF_SHAREABLE | RF_ACTIVE);
        if (ctrlr->res == NULL) {
                nvme_printf(ctrlr, "unable to allocate shared interrupt\n");
                ret = ENOMEM;
                goto bad;
        }

        ctrlr->msi_count = 0;
        ctrlr->num_io_queues = 1;
        if (bus_setup_intr(dev, ctrlr->res,
            INTR_TYPE_MISC | INTR_MPSAFE, NULL, nvme_ctrlr_shared_handler,
            ctrlr, &ctrlr->tag) != 0) {
                nvme_printf(ctrlr, "unable to setup shared interrupt\n");
                ret = ENOMEM;
                goto bad;
        }
        ctrlr->tag = (void *)0x1;

        /*
         * We're attached via this funky mechanism. Flag the controller so that
         * it avoids things that can't work when we do that, like asking for
         * PCI config space entries.
         */
        ctrlr->quirks |= QUIRK_AHCI;

        return (nvme_attach(dev));      /* Note: failure frees resources */
bad:
        if (ctrlr->resource != NULL) {
                bus_release_resource(dev, SYS_RES_MEMORY,
                    ctrlr->resource_id, ctrlr->resource);
        }
        if (ctrlr->res)
                bus_release_resource(ctrlr->dev, SYS_RES_IRQ,
                    rman_get_rid(ctrlr->res), ctrlr->res);
        return (ret);
}

static int
nvme_ahci_detach(device_t dev)
{
        return (nvme_detach(dev));
}