/*      $NetBSD: if_fxp_pci.c,v 1.87 2022/09/24 18:12:42 thorpej Exp $  */

/*-
 * Copyright (c) 1997, 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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.
 */

/*
 * PCI bus front-end for the Intel i82557 fast Ethernet controller
 * driver.  Works with Intel Etherexpress Pro 10+, 100B, 100+ cards.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_fxp_pci.c,v 1.87 2022/09/24 18:12:42 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/device.h>

#include <machine/endian.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_ether.h>

#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/mii/miivar.h>

#include <dev/ic/i82557reg.h>
#include <dev/ic/i82557var.h>

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

struct fxp_pci_softc {
        struct fxp_softc psc_fxp;

        pci_chipset_tag_t psc_pc;       /* pci chipset tag */
        pcireg_t psc_regs[0x20>>2];     /* saved PCI config regs (sparse) */
        pcitag_t psc_tag;               /* pci register tag */

        struct pci_conf_state psc_pciconf; /* standard PCI configuration regs */
};

static int      fxp_pci_match(device_t, cfdata_t, void *);
static void     fxp_pci_attach(device_t, device_t, void *);
static int      fxp_pci_detach(device_t, int);

static int      fxp_pci_enable(struct fxp_softc *);

static void fxp_pci_confreg_restore(struct fxp_pci_softc *psc);
static bool fxp_pci_resume(device_t dv, const pmf_qual_t *);

CFATTACH_DECL3_NEW(fxp_pci, sizeof(struct fxp_pci_softc),
    fxp_pci_match, fxp_pci_attach, fxp_pci_detach, NULL, NULL,
    null_childdetached, DVF_DETACH_SHUTDOWN);

static const struct device_compatible_entry compat_data[] = {
        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82552),
          .data = "Intel i82552 10/100 Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_8255X),
          .data = "Intel i8255x Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82559ER),
          .data = "Intel i82559ER Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_IN_BUSINESS),
          .data = "Intel InBusiness Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100),
          .data = "Intel PRO/100 Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_0),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_1),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_2),
          .data = "Intel PRO/100 VE Network Controller with 82562ET/EZ PHY" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_3),
          .data = "Intel PRO/100 VE Network Controller with 82562ET/EZ (CNR) PHY" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_4),
          .data = "Intel PRO/100 VE (MOB) Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_5),
          .data = "Intel PRO/100 VE (LOM) Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_6),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_7),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_8),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_9),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_10),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VE_11),
          .data = "Intel PRO/100 VE Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_0),
          .data = "Intel PRO/100 VM Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_1),
          .data = "Intel PRO/100 VM Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_2),
          .data = "Intel PRO/100 VM Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_3),
          .data = "Intel PRO/100 VM Network Controller with 82562EM/EX PHY" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_4),
          .data = "Intel PRO/100 VM Network Controller with 82562EM/EX (CNR) PHY" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_5),
          .data = "Intel PRO/100 VM (MOB) Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_6),
          .data = "Intel PRO/100 VM Network Controller with 82562ET/EZ PHY" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_7),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_8),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_9),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_10),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_11),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_12),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_13),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_14),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_15),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_VM_16),
          .data = "Intel PRO/100 VM Network Connection" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_PRO_100_M),
          .data = "Intel PRO/100 M Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801BA_LAN),
          .data = "Intel i82562 Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801E_LAN_1),
          .data = "Intel i82801E Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801E_LAN_2),
          .data = "Intel i82801E Ethernet" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801EB_LAN),
          .data = "Intel 82801EB/ER (ICH5) Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801FB_LAN),
          .data = "Intel i82801FB LAN Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801FB_LAN_2),
          .data = "Intel i82801FB LAN Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801G_LAN),
          .data = "Intel 82801GB/GR (ICH7) Network Controller" },

        { .id = PCI_ID_CODE(PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801GB_LAN),
          .data = "Intel 82801GB 10/100 Network Controller" },

        PCI_COMPAT_EOL
};

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

        return pci_compatible_match(pa, compat_data);
}

/*
 * On resume : (XXX it is necessary with new pmf framework ?)
 * Restore PCI configuration registers that may have been clobbered.
 * This is necessary due to bugs on the Sony VAIO Z505-series on-board
 * ethernet, after an APM suspend/resume, as well as after an ACPI
 * D3->D0 transition.  We call this function from a power hook after
 * APM resume events, as well as after the ACPI D3->D0 transition.
 */
static void
fxp_pci_confreg_restore(struct fxp_pci_softc *psc)
{
        pcireg_t reg;

#if 0
        /*
         * Check to see if the command register is blank -- if so, then
         * we'll assume that all the clobberable-registers have been
         * clobbered.
         */

        /*
         * In general, the above metric is accurate. Unfortunately,
         * it is inaccurate across a hibernation. Ideally APM/ACPI
         * code should take note of hibernation events and execute
         * a hibernation wakeup hook, but at present a hibernation wake
         * is indistinguishable from a suspend wake.
         */

        if (((reg = pci_conf_read(psc->psc_pc, psc->psc_tag,
            PCI_COMMAND_STATUS_REG)) & 0xffff) != 0)
                return;
#else
        reg = pci_conf_read(psc->psc_pc, psc->psc_tag, PCI_COMMAND_STATUS_REG);
#endif

        pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_COMMAND_STATUS_REG,
            (reg & 0xffff0000) |
            (psc->psc_regs[PCI_COMMAND_STATUS_REG>>2] & 0xffff));
        pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_BHLC_REG,
            psc->psc_regs[PCI_BHLC_REG>>2]);
        pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_MAPREG_START+0x0,
            psc->psc_regs[(PCI_MAPREG_START+0x0)>>2]);
        pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_MAPREG_START+0x4,
            psc->psc_regs[(PCI_MAPREG_START+0x4)>>2]);
        pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_MAPREG_START+0x8,
            psc->psc_regs[(PCI_MAPREG_START+0x8)>>2]);
}

static bool
fxp_pci_resume(device_t dv, const pmf_qual_t *qual)
{
        struct fxp_pci_softc *psc = device_private(dv);
        fxp_pci_confreg_restore(psc);

        return true;
}

static int
fxp_pci_detach(device_t self, int flags)
{
        struct fxp_pci_softc *psc = device_private(self);
        struct fxp_softc *sc = &psc->psc_fxp;
        int error;

        /* Finish off the attach. */
        if ((error = fxp_detach(sc, flags)) != 0)
                return error;

        pmf_device_deregister(self);

        pci_intr_disestablish(psc->psc_pc, sc->sc_ih);

        bus_space_unmap(sc->sc_st, sc->sc_sh, sc->sc_size);

        return 0;
}

static void
fxp_pci_attach(device_t parent, device_t self, void *aux)
{
        struct fxp_pci_softc *psc = device_private(self);
        struct fxp_softc *sc = &psc->psc_fxp;
        const struct pci_attach_args *pa = aux;
        pci_chipset_tag_t pc = pa->pa_pc;
        pci_intr_handle_t ih;
        const struct device_compatible_entry *dce;
        const char *chipname = NULL;
        const char *intrstr = NULL;
        bus_space_tag_t iot, memt;
        bus_space_handle_t ioh, memh;
        int ioh_valid, memh_valid;
        bus_addr_t addr;
        pcireg_t csr;
        int flags;
        int error;
        char intrbuf[PCI_INTRSTR_LEN];

        sc->sc_dev = self;

        /*
         * Map control/status registers.
         */
        ioh_valid = (pci_mapreg_map(pa, FXP_PCI_IOBA, PCI_MAPREG_TYPE_IO, 0,
            &iot, &ioh, NULL, NULL) == 0);

        /*
         * Version 2.1 of the PCI spec, page 196, "Address Maps":
         *
         *      Prefetchable
         *
         *      Set to one if there are no side effects on reads, the
         *      device returns all bytes regardless of the byte enables,
         *      and host bridges can merge processor writes into this
         *      range without causing errors.  Bit must be set to zero
         *      otherwise.
         *
         * The 82557 incorrectly sets the "prefetchable" bit, resulting
         * in errors on systems which will do merged reads and writes.
         * These errors manifest themselves as all-bits-set when reading
         * from the EEPROM or other < 4 byte registers.
         *
         * We must work around this problem by always forcing the mapping
         * for memory space to be uncacheable.  On systems which cannot
         * create an uncacheable mapping (because the firmware mapped it
         * into only cacheable/prefetchable space due to the "prefetchable"
         * bit), we can fall back onto i/o mapped access.
         */
        memh_valid = 0;
        memt = pa->pa_memt;
        if (((pa->pa_flags & PCI_FLAGS_MEM_OKAY) != 0) &&
            pci_mapreg_info(pa->pa_pc, pa->pa_tag, FXP_PCI_MMBA,
            PCI_MAPREG_TYPE_MEM|PCI_MAPREG_MEM_TYPE_32BIT,
            &addr, &sc->sc_size, &flags) == 0) {
                flags &= ~BUS_SPACE_MAP_PREFETCHABLE;
                if (bus_space_map(memt, addr, sc->sc_size, flags, &memh) == 0)
                        memh_valid = 1;
        }

        if (memh_valid) {
                sc->sc_st = memt;
                sc->sc_sh = memh;
                /*
                 * Enable address decoding for memory range in case BIOS or
                 * UEFI didn't set it.
                 */
                csr = pci_conf_read(pa->pa_pc, pa->pa_tag,
                    PCI_COMMAND_STATUS_REG);
                csr |= PCI_COMMAND_MEM_ENABLE;
                pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
                    csr);
        } else if (ioh_valid) {
                sc->sc_st = iot;
                sc->sc_sh = ioh;
        } else {
                aprint_error(": unable to map device registers\n");
                return;
        }

        sc->sc_dmat = pa->pa_dmat;

        dce = pci_compatible_lookup(pa, compat_data);
        KASSERT(dce != NULL);

        sc->sc_rev = PCI_REVISION(pa->pa_class);

        switch (PCI_PRODUCT(dce->id)) {
        case PCI_PRODUCT_INTEL_8255X:
        case PCI_PRODUCT_INTEL_IN_BUSINESS:

                if (sc->sc_rev >= FXP_REV_82558_A4) {
                        chipname = "i82558 Ethernet";
                        sc->sc_flags |= FXPF_FC|FXPF_EXT_TXCB;
                        /*
                         * Enable the MWI command for memory writes.
                         */
                        if (pa->pa_flags & PCI_FLAGS_MWI_OKAY)
                                sc->sc_flags |= FXPF_MWI;
                }
                if (sc->sc_rev >= FXP_REV_82559_A0) {
                        chipname = "i82559 Ethernet";
                        sc->sc_flags |= FXPF_82559_RXCSUM;
                }
                if (sc->sc_rev >= FXP_REV_82559S_A)
                        chipname = "i82559S Ethernet";
                if (sc->sc_rev >= FXP_REV_82550) {
                        chipname = "i82550 Ethernet";
                        sc->sc_flags &= ~FXPF_82559_RXCSUM;
                        sc->sc_flags |= FXPF_EXT_RFA;
                }
                if (sc->sc_rev >= FXP_REV_82551_E)
                        chipname = "i82551 Ethernet";

                /*
                 * Mark all i82559 and i82550 revisions as having
                 * the "resume bug".  See i82557.c for details.
                 */
                if (sc->sc_rev >= FXP_REV_82559_A0)
                        sc->sc_flags |= FXPF_HAS_RESUME_BUG;

                break;

        case PCI_PRODUCT_INTEL_82559ER:
                sc->sc_flags |= FXPF_FC|FXPF_EXT_TXCB;

                /*
                 * i82559ER/82551ER don't support RX hardware checksumming
                 * even though it has a newer revision number than 82559_A0.
                 */

                /* All i82559 have the "resume bug". */
                sc->sc_flags |= FXPF_HAS_RESUME_BUG;

                /* Enable the MWI command for memory writes. */
                if (pa->pa_flags & PCI_FLAGS_MWI_OKAY)
                        sc->sc_flags |= FXPF_MWI;

                if (sc->sc_rev >= FXP_REV_82551_E)
                        chipname = "Intel i82551ER Ethernet";

                break;

        case PCI_PRODUCT_INTEL_82801BA_LAN:
        case PCI_PRODUCT_INTEL_PRO_100_VE_0:
        case PCI_PRODUCT_INTEL_PRO_100_VE_1:
        case PCI_PRODUCT_INTEL_PRO_100_VM_0:
        case PCI_PRODUCT_INTEL_PRO_100_VM_1:
        case PCI_PRODUCT_INTEL_82562EH_HPNA_0:
        case PCI_PRODUCT_INTEL_82562EH_HPNA_1:
        case PCI_PRODUCT_INTEL_82562EH_HPNA_2:
        case PCI_PRODUCT_INTEL_PRO_100_VM_2:
                /*
                 * The ICH-2 and ICH-3 have the "resume bug".
                 */
                sc->sc_flags |= FXPF_HAS_RESUME_BUG;
                /* FALLTHROUGH */

        default:
                if (sc->sc_rev >= FXP_REV_82558_A4)
                        sc->sc_flags |= FXPF_FC|FXPF_EXT_TXCB;
                if (sc->sc_rev >= FXP_REV_82559_A0)
                        sc->sc_flags |= FXPF_82559_RXCSUM;

                break;
        }

        pci_aprint_devinfo_fancy(pa, "Ethernet controller",
                (chipname != NULL ? chipname : dce->data), 1);

        /* Make sure bus-mastering is enabled. */
        pci_conf_write(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
            pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG) |
            PCI_COMMAND_MASTER_ENABLE);

        /*
         * Under some circumstances (such as APM suspend/resume
         * cycles, and across ACPI power state changes), the
         * i82257-family can lose the contents of critical PCI
         * configuration registers, causing the card to be
         * non-responsive and useless.  This occurs on the Sony VAIO
         * Z505-series, among others.  Preserve them here so they can
         * be later restored (by fxp_pci_confreg_restore()).
         */
        psc->psc_pc = pc;
        psc->psc_tag = pa->pa_tag;
        psc->psc_regs[PCI_COMMAND_STATUS_REG>>2] =
            pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
        psc->psc_regs[PCI_BHLC_REG>>2] =
            pci_conf_read(pc, pa->pa_tag, PCI_BHLC_REG);
        psc->psc_regs[(PCI_MAPREG_START+0x0)>>2] =
            pci_conf_read(pc, pa->pa_tag, PCI_MAPREG_START+0x0);
        psc->psc_regs[(PCI_MAPREG_START+0x4)>>2] =
            pci_conf_read(pc, pa->pa_tag, PCI_MAPREG_START+0x4);
        psc->psc_regs[(PCI_MAPREG_START+0x8)>>2] =
            pci_conf_read(pc, pa->pa_tag, PCI_MAPREG_START+0x8);

        /* power up chip */
        switch ((error = pci_activate(pa->pa_pc, pa->pa_tag, self,
            pci_activate_null))) {
        case EOPNOTSUPP:
                break;
        case 0:
                sc->sc_enable = fxp_pci_enable;
                sc->sc_disable = NULL;
                break;
        default:
                aprint_error_dev(self, "cannot activate %d\n", error);
                return;
        }

        /* Restore PCI configuration registers. */
        fxp_pci_confreg_restore(psc);

        sc->sc_enabled = 1;

        /*
         * Map and establish our interrupt.
         */
        if (pci_intr_map(pa, &ih)) {
                aprint_error_dev(self, "couldn't map interrupt\n");
                return;
        }
        intrstr = pci_intr_string(pc, ih, intrbuf, sizeof(intrbuf));
        sc->sc_ih = pci_intr_establish_xname(pc, ih, IPL_NET, fxp_intr, sc,
            device_xname(self));
        if (sc->sc_ih == NULL) {
                aprint_error_dev(self, "couldn't establish interrupt");
                if (intrstr != NULL)
                        aprint_error(" at %s", intrstr);
                aprint_error("\n");
                return;
        }
        aprint_normal_dev(self, "interrupting at %s\n", intrstr);

        /* Finish off the attach. */
        fxp_attach(sc);
        if (sc->sc_disable != NULL)
                fxp_disable(sc);

        /* Add a suspend hook to restore PCI config state */
        if (pmf_device_register(self, NULL, fxp_pci_resume))
                pmf_class_network_register(self, &sc->sc_ethercom.ec_if);
        else
                aprint_error_dev(self, "couldn't establish power handler\n");
}

static int
fxp_pci_enable(struct fxp_softc *sc)
{
        struct fxp_pci_softc *psc = (void *) sc;

#if 0
        printf("%s: going to power state D0\n", device_xname(self));
#endif

        /* Now restore the configuration registers. */
        fxp_pci_confreg_restore(psc);

        return 0;
}