/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2006 Benno Rice.  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, 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 ``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 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>
/*
 * Driver for the SEEQ 80220 and 84220.
 * (Originally developed for the internal PHY on the SMSC LAN91C111.)
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/malloc.h>

#include <machine/bus.h>

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

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

#include "miibus_if.h"

static int      smcphy_probe(device_t);
static int      smcphy_attach(device_t);

static int      smcphy_service(struct mii_softc *, struct mii_data *, int);
static void     smcphy_reset(struct mii_softc *);
static void     smcphy_auto(struct mii_softc *, int);
static void     smcphy_status(struct mii_softc *);

static device_method_t smcphy_methods[] = {
        /* device interface */
        DEVMETHOD(device_probe,         smcphy_probe),
        DEVMETHOD(device_attach,        smcphy_attach),
        DEVMETHOD(device_detach,        mii_phy_detach),
        DEVMETHOD(device_shutdown,      bus_generic_shutdown),
        DEVMETHOD_END
};

static driver_t smcphy_driver = {
        "smcphy",
        smcphy_methods,
        sizeof(struct mii_softc)
};

DRIVER_MODULE(smcphy, miibus, smcphy_driver, 0, 0);

static const struct mii_phydesc smcphys[] = {
        MII_PHY_DESC(SEEQ, 80220),
        MII_PHY_DESC(SEEQ, 84220),
        MII_PHY_END
};

static const struct mii_phy_funcs smcphy80220_funcs = {
        smcphy_service,
        smcphy_status,
        mii_phy_reset
};

static const struct mii_phy_funcs smcphy_funcs = {
        smcphy_service,
        smcphy_status,
        smcphy_reset
};

static int
smcphy_probe(device_t dev)
{

        return (mii_phy_dev_probe(dev, smcphys, BUS_PROBE_DEFAULT));
}

static int
smcphy_attach(device_t dev)
{
        struct mii_softc *sc;
        struct mii_attach_args *ma;
        const struct mii_phy_funcs *mpf;

        sc = device_get_softc(dev);
        ma = device_get_ivars(dev);
        if (MII_MODEL(ma->mii_id2) == MII_MODEL_SEEQ_80220)
                mpf = &smcphy80220_funcs;
        else
                mpf = &smcphy_funcs;
        mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE, mpf, 1);
        mii_phy_setmedia(sc);

        return (0);
}

static int
smcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
        struct  ifmedia_entry *ife;
        int     reg;

        ife = mii->mii_media.ifm_cur;

        switch (cmd) {
        case MII_POLLSTAT:
                break;

        case MII_MEDIACHG:
                switch (IFM_SUBTYPE(ife->ifm_media)) {
                case IFM_AUTO:
                        smcphy_auto(sc, ife->ifm_media);
                        break;

                default:
                        mii_phy_setmedia(sc);
                        break;
                }

                break;

        case MII_TICK:
                if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
                        break;
                }

                /* I have no idea why BMCR_ISO gets set. */
                reg = PHY_READ(sc, MII_BMCR);
                if (reg & BMCR_ISO) {
                        PHY_WRITE(sc, MII_BMCR, reg & ~BMCR_ISO);
                }

                reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
                if (reg & BMSR_LINK) {
                        sc->mii_ticks = 0;
                        break;
                }

                if (++sc->mii_ticks <= MII_ANEGTICKS) {
                        break;
                }

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

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

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

static void
smcphy_reset(struct mii_softc *sc)
{
        u_int   bmcr;
        int     timeout;

        PHY_WRITE(sc, MII_BMCR, BMCR_RESET);

        for (timeout = 2; timeout > 0; timeout--) {
                DELAY(50000);
                bmcr = PHY_READ(sc, MII_BMCR);
                if ((bmcr & BMCR_RESET) == 0)
                        break;
        }

        if (bmcr & BMCR_RESET)
                device_printf(sc->mii_dev, "reset failed\n");

        PHY_WRITE(sc, MII_BMCR, 0x3000);

        /* Mask interrupts, we poll instead. */
        PHY_WRITE(sc, 0x1e, 0xffc0);
}

static void
smcphy_auto(struct mii_softc *sc, int media)
{
        uint16_t        anar;

        anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) | ANAR_CSMA;
        if ((media & IFM_FLOW) != 0 || (sc->mii_flags & MIIF_FORCEPAUSE) != 0)
                anar |= ANAR_FC;
        PHY_WRITE(sc, MII_ANAR, anar);
        /* Apparently this helps. */
        anar = PHY_READ(sc, MII_ANAR);
        PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
}

static void
smcphy_status(struct mii_softc *sc)
{
        struct mii_data *mii;
        uint32_t bmcr, bmsr, status;

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

        bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
        if ((bmsr & BMSR_LINK) != 0)
                mii->mii_media_status |= IFM_ACTIVE;

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

        if ((bmcr & BMCR_LOOP) != 0)
                mii->mii_media_active |= IFM_LOOP;

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

        status = PHY_READ(sc, 0x12);
        if (status & 0x0080)
                mii->mii_media_active |= IFM_100_TX;
        else
                mii->mii_media_active |= IFM_10_T;
        if (status & 0x0040)
                mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
        else
                mii->mii_media_active |= IFM_HDX;
}