/*      $NetBSD: jmphy.c,v 1.5 2023/02/22 08:09:09 msaitoh Exp $ */
/*      $OpenBSD: jmphy.c,v 1.6 2015/03/14 03:38:48 jsg Exp $   */
/*-
* Copyright (c) 2008, Pyun YongHyeon <[email protected]>
* 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.
*
* $FreeBSD: src/sys/dev/mii/jmphy.c,v 1.1 2008/05/27 01:16:40 yongari Exp $
* $DragonFly: src/sys/dev/netif/mii_layer/jmphy.c,v 1.1 2008/07/22 11:28:49 sephe Exp $
*/

/*
* Driver for the JMicron JMP211 10/100/1000, JMP202 10/100 PHY.
*/

#include <sys/param.h>
#include <sys/systm.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>
#include <dev/mii/miidevs.h>
#include <dev/mii/jmphyreg.h>

static int      jmphy_service(struct mii_softc *, struct mii_data *, int);
static void     jmphy_status(struct mii_softc *);
static int      jmphy_match(device_t, cfdata_t, void *);
static void     jmphy_attach(device_t, device_t, void *);
static void     jmphy_reset(struct mii_softc *);
static uint16_t jmphy_anar(struct ifmedia_entry *);
static int      jmphy_auto(struct mii_softc *, struct ifmedia_entry *);

static const struct mii_phy_funcs jmphy_funcs = {
       jmphy_service, jmphy_status, jmphy_reset,
};

CFATTACH_DECL_NEW(jmphy, sizeof (struct mii_softc),
   jmphy_match, jmphy_attach, mii_phy_detach, mii_phy_activate);

static const struct mii_phydesc jmphys[] = {
       MII_PHY_DESC(JMICRON, JMP202),
       MII_PHY_DESC(JMICRON, JMP211),
       MII_PHY_END,
};

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

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

       return 0;
}

static void
jmphy_attach(device_t parent, device_t self, void *aux)
{
       struct mii_softc *sc = device_private(self);
       struct mii_attach_args *ma = aux;
       struct mii_data *mii = ma->mii_data;
       const struct mii_phydesc *mpd;

       mpd = mii_phy_match(ma, jmphys);
       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_funcs = &jmphy_funcs;
       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_pdata = mii;
       sc->mii_flags = ma->mii_flags;

       sc->mii_flags |= MIIF_NOISOLATE | MIIF_NOLOOP;

       mii_lock(mii);

       PHY_RESET(sc);

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

       mii_unlock(mii);

       mii_phy_add_media(sc);
}

static int
jmphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
       struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
       uint16_t bmcr, ssr;

       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, &bmcr);
                       PHY_WRITE(sc, MII_BMCR, bmcr | BMCR_ISO);
                       return 0;
               }

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

               if (jmphy_auto(sc, ife) != EJUSTRETURN)
                       return EINVAL;
               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)
                       break;

               /* Check for link. */
               PHY_READ(sc, JMPHY_SSR, &ssr);
               if (ssr & JMPHY_SSR_LINK_UP) {
                       sc->mii_ticks = 0;
                       break;
               }

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

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

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

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

static void
jmphy_status(struct mii_softc *sc)
{
       struct mii_data *mii = sc->mii_pdata;
       uint16_t bmcr, ssr, gtsr;

       KASSERT(mii_locked(mii));

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

       PHY_READ(sc, JMPHY_SSR, &ssr);
       if ((ssr & JMPHY_SSR_LINK_UP) != 0)
               mii->mii_media_status |= IFM_ACTIVE;

       PHY_READ(sc, MII_BMCR, &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 ((ssr & JMPHY_SSR_SPD_DPLX_RESOLVED) == 0) {
               /* Erg, still trying, I guess... */
               mii->mii_media_active |= IFM_NONE;
               return;
       }

       switch ((ssr & JMPHY_SSR_SPEED_MASK)) {
       case JMPHY_SSR_SPEED_1000:
               mii->mii_media_active |= IFM_1000_T;
               /*
                * jmphy(4) got a valid link so reset mii_ticks.
                * Resetting mii_ticks is needed in order to
                * detect link loss after auto-negotiation.
                */
               sc->mii_ticks = 0;
               break;
       case JMPHY_SSR_SPEED_100:
               mii->mii_media_active |= IFM_100_TX;
               sc->mii_ticks = 0;
               break;
       case JMPHY_SSR_SPEED_10:
               mii->mii_media_active |= IFM_10_T;
               sc->mii_ticks = 0;
               break;
       default:
               mii->mii_media_active |= IFM_NONE;
               return;
       }

       if ((ssr & JMPHY_SSR_DUPLEX) != 0)
               mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
       else
               mii->mii_media_active |= IFM_HDX;

       if (IFM_SUBTYPE(mii->mii_media_active) == IFM_1000_T) {
               PHY_READ(sc, MII_GTSR, &gtsr);
               if ((gtsr & GTSR_MS_RES) != 0)
                       mii->mii_media_active |= IFM_ETH_MASTER;
       }
}

static void
jmphy_reset(struct mii_softc *sc)
{
       int i;
       uint16_t val;

       KASSERT(mii_locked(sc->mii_pdata));

       /* Disable sleep mode. */
       PHY_READ(sc, JMPHY_TMCTL, &val);
       PHY_WRITE(sc, JMPHY_TMCTL, val & ~JMPHY_TMCTL_SLEEP_ENB);

       PHY_READ(sc, MII_BMCR, &val);
       PHY_WRITE(sc, MII_BMCR, val | BMCR_RESET);

       for (i = 0; i < 1000; i++) {
               DELAY(1);
               PHY_READ(sc, MII_BMCR, &val);
               if ((val & BMCR_RESET) == 0)
                       break;
       }
}

static uint16_t
jmphy_anar(struct ifmedia_entry *ife)
{
       uint16_t anar;

       anar = 0;
       switch (IFM_SUBTYPE(ife->ifm_media)) {
       case IFM_AUTO:
               anar |= ANAR_TX_FD | ANAR_TX | ANAR_10_FD | ANAR_10;
               break;
       case IFM_1000_T:
               break;
       case IFM_100_TX:
               anar |= ANAR_TX | ANAR_TX_FD;
               break;
       case IFM_10_T:
               anar |= ANAR_10 | ANAR_10_FD;
               break;
       default:
               break;
       }

       return anar;
}

static int
jmphy_auto(struct mii_softc *sc, struct ifmedia_entry *ife)
{
       uint16_t anar, bmcr, gig;

       KASSERT(mii_locked(sc->mii_pdata));

       gig = 0;
       PHY_READ(sc, MII_BMCR, &bmcr);
       switch (IFM_SUBTYPE(ife->ifm_media)) {
       case IFM_AUTO:
               gig |= GTCR_ADV_1000TFDX | GTCR_ADV_1000THDX;
               break;
       case IFM_1000_T:
               gig |= GTCR_ADV_1000TFDX | GTCR_ADV_1000THDX;
               break;
       case IFM_100_TX:
       case IFM_10_T:
               break;
       case IFM_NONE:
               PHY_WRITE(sc, MII_BMCR, bmcr | BMCR_ISO | BMCR_PDOWN);
               return EJUSTRETURN;
       default:
               return EINVAL;
       }

       if ((ife->ifm_media & IFM_LOOP) != 0)
               bmcr |= BMCR_LOOP;

       anar = jmphy_anar(ife);
       if (sc->mii_flags & MIIF_DOPAUSE)
               anar |= ANAR_PAUSE_TOWARDS;

       if ((sc->mii_flags & MIIF_HAVE_GTCR) != 0) {
#ifdef notyet
               struct mii_data *mii;

               mii = sc->mii_pdata;
               if ((mii->mii_media.ifm_media & IFM_ETH_MASTER) != 0)
                       gig |= GTCR_MAN_MS | GTCR_MAN_ADV;
#endif
               PHY_WRITE(sc, MII_100T2CR, gig);
       }
       PHY_WRITE(sc, MII_ANAR, anar | ANAR_CSMA);
       PHY_WRITE(sc, MII_BMCR, bmcr | BMCR_AUTOEN | BMCR_STARTNEG);

       return EJUSTRETURN;
}

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