/*      $NetBSD: ipgphy.c,v 1.12 2026/07/04 17:39:42 andvar Exp $ */
/*      $OpenBSD: ipgphy.c,v 1.19 2015/07/19 06:28:12 yuo Exp $ */

/*-
 * Copyright (c) 2006, Pyun YongHyeon <yongari@FreeBSD.org>
 * All rights reserved.
 *
 * 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 unmodified, 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.
 *
 */

/*
 * Driver for the IC Plus IP1000A/IP1001 10/100/1000 PHY.
 */
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ipgphy.c,v 1.12 2026/07/04 17:39:42 andvar Exp $");

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

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

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

#include <dev/mii/ipgphyreg.h>

static int ipgphy_match(device_t, cfdata_t, void *);
static void ipgphy_attach(device_t, device_t, void *);

struct ipgphy_softc {
        struct mii_softc sc_mii;
        bool need_loaddspcode;
};

CFATTACH_DECL_NEW(ipgphy, sizeof(struct ipgphy_softc),
    ipgphy_match, ipgphy_attach, mii_phy_detach, mii_phy_activate);

static int      ipgphy_service(struct mii_softc *, struct mii_data *, int);
static void     ipgphy_status(struct mii_softc *);
static int      ipgphy_mii_phy_auto(struct mii_softc *, u_int);
static void     ipgphy_load_dspcode(struct mii_softc *);
static void     ipgphy_reset(struct mii_softc *);

static const struct mii_phy_funcs ipgphy_funcs = {
        ipgphy_service, ipgphy_status, ipgphy_reset,
};

static const struct mii_phydesc ipgphys[] = {
        MII_PHY_DESC(xxICPLUS, IP1000A),
        MII_PHY_DESC(xxICPLUS, IP1001),
        MII_PHY_END,
};

static int
ipgphy_match(device_t parent, cfdata_t match, void *aux)
{
        struct mii_attach_args *ma = aux;

        if (mii_phy_match(ma, ipgphys) != NULL)
                return 10;

        return 0;
}

static void
ipgphy_attach(device_t parent, device_t self, void *aux)
{
        struct ipgphy_softc *isc = device_private(self);
        struct mii_softc *sc = &isc->sc_mii;
        struct mii_attach_args *ma = aux;
        struct mii_data *mii = ma->mii_data;
        const struct mii_phydesc *mpd;
        prop_dictionary_t dict;

        mpd = mii_phy_match(ma, ipgphys);
        aprint_naive(": Media interface\n");
        aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));

        sc->mii_dev = self;
        sc->mii_inst = mii->mii_instance;
        sc->mii_phy = ma->mii_phyno;
        sc->mii_mpd_oui = MII_OUI(ma->mii_id1, ma->mii_id2);
        sc->mii_mpd_model = MII_MODEL(ma->mii_id2);
        sc->mii_mpd_rev = MII_REV(ma->mii_id2);
        sc->mii_funcs = &ipgphy_funcs;
        sc->mii_pdata = mii;
        sc->mii_flags = ma->mii_flags;
        sc->mii_flags |= MIIF_NOISOLATE;

        if (device_is_a(parent, "stge")) {
                dict = device_properties(parent);
                prop_dictionary_get_bool(dict, "need_loaddspcode",
                    &isc->need_loaddspcode);
        }

        mii_lock(mii);

        PHY_RESET(sc);

        PHY_READ(sc, MII_BMSR, &sc->mii_capabilities);
        sc->mii_capabilities &= ma->mii_capmask;
        //sc->mii_capabilities &= ~BMSR_ANEG;
        if (sc->mii_capabilities & BMSR_EXTSTAT)
                PHY_READ(sc, MII_EXTSR, &sc->mii_extcapabilities);

        mii_unlock(mii);

        mii_phy_add_media(sc);
}

static int
ipgphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
        struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
        uint16_t reg, speed;

        KASSERT(mii_locked(mii));

        switch (cmd) {
        case MII_POLLSTAT:
                /* If we're not polling our PHY instance, just return. */
                if (IFM_INST(ife->ifm_media) != sc->mii_inst)
                        return 0;
                break;

        case MII_MEDIACHG:
                /*
                 * If the media indicates a different PHY instance,
                 * isolate ourselves.
                 */
                if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
                        PHY_READ(sc, MII_BMCR, &reg);
                        PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
                        return 0;
                }

                /* If the interface is not up, don't do anything. */
                if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                        break;

                PHY_RESET(sc);

                switch (IFM_SUBTYPE(ife->ifm_media)) {
                case IFM_AUTO:
                case IFM_1000_T:
                        /*
                         * This device is required to do auto negotiation
                         * on 1000BASE-T.
                         */
                        (void)ipgphy_mii_phy_auto(sc, ife->ifm_media);
                        goto done;
                        break;

                case IFM_100_TX:
                        speed = BMCR_S100;
                        break;

                case IFM_10_T:
                        speed = BMCR_S10;
                        break;

                default:
                        return EINVAL;
                }

                if ((ife->ifm_media & IFM_FDX) != 0)
                        speed |= BMCR_FDX;

                PHY_WRITE(sc, MII_100T2CR, 0);
                PHY_WRITE(sc, MII_BMCR, speed);
done:
                break;

        case MII_TICK:
                /* If we're not currently selected, just return. */
                if (IFM_INST(ife->ifm_media) != sc->mii_inst)
                        return 0;

                /* Is the interface even up? */
                if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                        return 0;

                /* Only used for autonegotiation. */
                if ((IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) &&
                    (IFM_SUBTYPE(ife->ifm_media) != IFM_1000_T)) {
                        sc->mii_ticks = 0;
                        break;
                }

                /*
                 * Check to see if we have link.  If we do, we don't
                 * need to restart the autonegotiation process.  Read
                 * the BMSR twice in case it's latched.
                 */
                PHY_READ(sc, MII_BMSR, &reg);
                PHY_READ(sc, MII_BMSR, &reg);
                if (reg & BMSR_LINK) {
                        /*
                         * Reset autonegotiation timer to 0 in case the link
                         * goes down in the next tick.
                         */
                        sc->mii_ticks = 0;
                        /* See above. */
                        break;
                }

                /* Announce link loss right after it happens */
                if (sc->mii_ticks++ == 0)
                        break;

                /* Only retry autonegotiation every mii_anegticks seconds. */
                if (sc->mii_ticks < sc->mii_anegticks)
                        break;

                sc->mii_ticks = 0;
                ipgphy_mii_phy_auto(sc, ife->ifm_media);
                break;
        }

        /* Update the media status. */
        ipgphy_status(sc);

        /* Callback if something changed. */
        mii_phy_update(sc, cmd);
        return 0;
}

static void
ipgphy_status(struct mii_softc *sc)
{
        struct mii_data *mii = sc->mii_pdata;
        struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
        uint16_t bmsr, bmcr, stat, gtsr;

        KASSERT(mii_locked(mii));

        /* For IP1000A, use generic way */
        if (sc->mii_mpd_model == MII_MODEL_xxICPLUS_IP1000A) {
                ukphy_status(sc);
                return;
        }

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

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

        PHY_READ(sc, MII_BMCR, &bmcr);
        if (bmcr & BMCR_LOOP)
                mii->mii_media_active |= IFM_LOOP;

        if (bmcr & BMCR_AUTOEN) {
                if ((bmsr & BMSR_ACOMP) == 0) {
                        /* Erg, still trying, I guess... */
                        mii->mii_media_active |= IFM_NONE;
                        return;
                }

                PHY_READ(sc, IPGPHY_LSR, &stat);
                switch (stat & IPGPHY_LSR_SPEED_MASK) {
                case IPGPHY_LSR_SPEED_10:
                        mii->mii_media_active |= IFM_10_T;
                        break;
                case IPGPHY_LSR_SPEED_100:
                        mii->mii_media_active |= IFM_100_TX;
                        break;
                case IPGPHY_LSR_SPEED_1000:
                        mii->mii_media_active |= IFM_1000_T;
                        break;
                default:
                        mii->mii_media_active |= IFM_NONE;
                        return;
                }

                if (stat & IPGPHY_LSR_FULL_DUPLEX)
                        mii->mii_media_active |= IFM_FDX;
                else
                        mii->mii_media_active |= IFM_HDX;

                if (mii->mii_media_active & IFM_FDX)
                        mii->mii_media_active |= mii_phy_flowstatus(sc);

                if (IFM_SUBTYPE(mii->mii_media_active) == IFM_1000_T) {
                        PHY_READ(sc, MII_100T2SR, &gtsr);
                        if (gtsr & GTSR_MS_RES)
                                mii->mii_media_active |= IFM_ETH_MASTER;
                }
        } else
                mii->mii_media_active = ife->ifm_media;
}

static int
ipgphy_mii_phy_auto(struct mii_softc *sc, u_int media)
{
        uint16_t reg = 0;
        u_int subtype = IFM_SUBTYPE(media);

        KASSERT(mii_locked(sc->mii_pdata));

        /* XXX Is it required ? */
        if (sc->mii_mpd_model == MII_MODEL_xxICPLUS_IP1001) {
                PHY_READ(sc, MII_ANAR, &reg);
                reg &= ~(ANAR_PAUSE_SYM | ANAR_PAUSE_ASYM);
                reg |= ANAR_NP;
        }

        if (subtype == IFM_AUTO)
                reg |= ANAR_10 | ANAR_10_FD | ANAR_TX | ANAR_TX_FD;

        if (sc->mii_flags & MIIF_DOPAUSE)
                reg |= ANAR_PAUSE_SYM | ANAR_PAUSE_ASYM;

        PHY_WRITE(sc, MII_ANAR, reg | ANAR_CSMA);

        if (subtype == IFM_AUTO)
                reg = GTCR_ADV_1000TFDX | GTCR_ADV_1000THDX;
        else if (subtype == IFM_1000_T) {
                if ((media & IFM_FDX) != 0)
                        reg = GTCR_ADV_1000TFDX;
                else
                        reg = GTCR_ADV_1000THDX;
        } else
                reg = 0;

        PHY_WRITE(sc, MII_100T2CR, reg);

        PHY_WRITE(sc, MII_BMCR, BMCR_FDX | BMCR_AUTOEN | BMCR_STARTNEG);

        return EJUSTRETURN;
}

static void
ipgphy_load_dspcode(struct mii_softc *sc)
{

        PHY_WRITE(sc, 31, 0x0001);
        PHY_WRITE(sc, 27, 0x01e0);
        PHY_WRITE(sc, 31, 0x0002);
        PHY_WRITE(sc, 27, 0xeb8e);
        PHY_WRITE(sc, 31, 0x0000);
        PHY_WRITE(sc, 30, 0x005e);
        PHY_WRITE(sc, 9, 0x0700);

        DELAY(50);
}

static void
ipgphy_reset(struct mii_softc *sc)
{
        struct ipgphy_softc *isc = device_private(sc->mii_dev);
        uint16_t reg;

        KASSERT(mii_locked(sc->mii_pdata));

        mii_phy_reset(sc);

        /* Clear autoneg/full-duplex as we don't want it after reset */
        PHY_READ(sc, MII_BMCR, &reg);
        reg &= ~(BMCR_AUTOEN | BMCR_FDX);
        PHY_WRITE(sc, MII_BMCR, reg);

        if (isc->need_loaddspcode)
                ipgphy_load_dspcode(sc);
}