/*      $NetBSD: amdnb_misc.c,v 1.5 2021/08/07 16:19:07 thorpej Exp $ */
/*
 * Copyright (c) 2012 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christoph Egger.
 *
 * 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: amdnb_misc.c,v 1.5 2021/08/07 16:19:07 thorpej Exp $");

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

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

static int amdnb_misc_match(device_t, cfdata_t match, void *);
static void amdnb_misc_attach(device_t, device_t, void *);
static int amdnb_misc_detach(device_t, int);
static int amdnb_misc_rescan(device_t, const char *, const int *);
static void amdnb_misc_childdet(device_t, device_t);

struct amdnb_misc_softc {
        struct pci_attach_args sc_pa;
};

CFATTACH_DECL3_NEW(amdnb_misc, sizeof(struct amdnb_misc_softc),
    amdnb_misc_match, amdnb_misc_attach, amdnb_misc_detach, NULL,
    amdnb_misc_rescan, amdnb_misc_childdet, DVF_DETACH_SHUTDOWN);


static int
amdnb_misc_match(device_t parent, cfdata_t match, void *aux)
{
        struct pci_attach_args *pa = aux;

        if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD)
                return 0;

        switch (PCI_PRODUCT(pa->pa_id)) {
        case PCI_PRODUCT_AMD_AMD64_MISC:
        case PCI_PRODUCT_AMD_AMD64_F10_MISC:
        case PCI_PRODUCT_AMD_AMD64_F11_MISC:
        case PCI_PRODUCT_AMD_F14_NB:            /* Family 12h, too */
        case PCI_PRODUCT_AMD_F15_MISC:
        case PCI_PRODUCT_AMD_F16_NB:
        case PCI_PRODUCT_AMD_F16_30_NB:
                break;
        default:
                return 0;
        }

        return 2;       /* supercede pchb(4) */
}

static int
amdnb_misc_search(device_t parent, cfdata_t cf, const int *locs, void *aux)
{
        device_t dev;
        deviter_t di;
        bool attach;

        if (!config_probe(parent, cf, aux))
                return 0;

        attach = true;

        /* Figure out if found child 'cf' is already attached.
         * No need to attach it twice.
         */

        /* XXX: I only want to iterate over the children of *this* device.
         * Can we introduce a
         * deviter_first_child(&di, parent, DEVITER_F_LEAVES_ONLY)
         * or even better, can we introduce a query function that returns
         * if a child is already attached?
         */
        for (dev = deviter_first(&di, DEVITER_F_LEAVES_FIRST); dev != NULL;
            dev = deviter_next(&di))
        {
                if (device_parent(dev) != parent)
                        continue;
                if (device_is_a(dev, cf->cf_name)) {
                        attach = false;
                        break;
                }
        }
        deviter_release(&di);

        if (!attach)
                return 0;

        config_attach(parent, cf, aux, NULL, CFARGS_NONE);

        return 0;
}

static void
amdnb_misc_attach(device_t parent, device_t self, void *aux)
{
        struct amdnb_misc_softc *sc = device_private(self);
        struct pci_attach_args *pa = aux;

        sc->sc_pa = *pa;

        aprint_naive("\n");
        aprint_normal(": AMD NB Misc Configuration\n");

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "couldn't establish power handler\n");

        config_search(self, &sc->sc_pa,
            CFARGS(.search = amdnb_misc_search));

        return;
}

static int
amdnb_misc_detach(device_t self, int flags)
{
        int rv;

        rv = config_detach_children(self, flags);
        if (rv != 0)
                return rv;

        pmf_device_deregister(self);
        return rv;
}

static int
amdnb_misc_rescan(device_t self, const char *ifattr, const int *locators)
{
        struct amdnb_misc_softc *sc = device_private(self);

        config_search(self, &sc->sc_pa,
            CFARGS(.search = amdnb_misc_search));

        return 0;
}

static void
amdnb_misc_childdet(device_t self, device_t child)
{
        return;
}