/*      $NetBSD: ukphy_subr.c,v 1.17 2020/03/15 23:04:50 thorpej Exp $  */

/*-
 * Copyright (c) 1998 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, and by Frank van der Linden.
 *
 * 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.
 */

/*
 * Subroutines shared by the ukphy driver and other PHY drivers.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ukphy_subr.c,v 1.17 2020/03/15 23:04:50 thorpej Exp $");

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

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

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>

/*
 * Media status subroutine.  If a PHY driver does media detection simply
 * by decoding the NWay autonegotiation, use this routine.
 */
void
ukphy_status(struct mii_softc *phy)
{
        struct mii_data *mii = phy->mii_pdata;
        struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
        uint16_t bmsr, bmcr, anar, anlpar, gtcr, gtsr, result;

        KASSERT(mii_locked(mii));

        mii->mii_media_status = IFM_AVALID;
        mii->mii_media_active = IFM_ETHER;

        PHY_READ(phy, MII_BMSR, &bmsr);
        PHY_READ(phy, MII_BMSR, &bmsr);
        if (bmsr & BMSR_LINK)
                mii->mii_media_status |= IFM_ACTIVE;

        PHY_READ(phy, MII_BMCR, &bmcr);
        if (bmcr & BMCR_ISO) {
                mii->mii_media_active |= IFM_NONE;
                mii->mii_media_status = 0;
                return;
        }

        if (bmcr & BMCR_LOOP)
                mii->mii_media_active |= IFM_LOOP;

        if (bmcr & BMCR_AUTOEN) {
                /*
                 * NWay autonegotiation takes the highest-order common
                 * bit of the ANAR and ANLPAR (i.e. best media advertised
                 * both by us and our link partner).
                 */
                if ((bmsr & BMSR_ACOMP) == 0) {
                        /* Erg, still trying, I guess... */
                        mii->mii_media_active |= IFM_NONE;
                        return;
                }

                PHY_READ(phy, MII_ANAR, &anar);
                PHY_READ(phy, MII_ANLPAR, &anlpar);
                result = anar & anlpar;
                if ((phy->mii_flags & MIIF_HAVE_GTCR) != 0 &&
                    (phy->mii_extcapabilities &
                        (EXTSR_1000THDX | EXTSR_1000TFDX)) != 0) {
                        PHY_READ(phy, MII_100T2CR, &gtcr);
                        PHY_READ(phy, MII_100T2SR, &gtsr);
                } else
                        gtcr = gtsr = 0;

                if ((gtcr & GTCR_ADV_1000TFDX) && (gtsr & GTSR_LP_1000TFDX))
                        mii->mii_media_active |= IFM_1000_T | IFM_FDX;
                else if ((gtcr & GTCR_ADV_1000THDX) &&
                         (gtsr & GTSR_LP_1000THDX))
                        mii->mii_media_active |= IFM_1000_T | IFM_HDX;
                else if (result & ANLPAR_TX_FD)
                        mii->mii_media_active |= IFM_100_TX | IFM_FDX;
                else if (result & ANLPAR_T4)
                        mii->mii_media_active |= IFM_100_T4 | IFM_HDX;
                else if (result & ANLPAR_TX)
                        mii->mii_media_active |= IFM_100_TX | IFM_HDX;
                else if (result & ANLPAR_10_FD)
                        mii->mii_media_active |= IFM_10_T | IFM_FDX;
                else if (result & ANLPAR_10)
                        mii->mii_media_active |= IFM_10_T | IFM_HDX;
                else
                        mii->mii_media_active |= IFM_NONE;

                if ((IFM_SUBTYPE(mii->mii_media_active) == IFM_1000_T) &&
                    (gtsr & GTSR_MS_RES))
                        mii->mii_media_active |= IFM_ETH_MASTER;

                if (mii->mii_media_active & IFM_FDX)
                        mii->mii_media_active |= mii_phy_flowstatus(phy);
        } else
                mii->mii_media_active = ife->ifm_media;
}