/*      $NetBSD: nsphyter.c,v 1.46 2020/03/28 18:37:18 thorpej Exp $    */

/*-
* Copyright (c) 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.
*/

/*
* Copyright (c) 1997 Manuel Bouyer.  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.
*/

/*
* driver for National Semiconductor's DP83843 `PHYTER' ethernet 10/100 PHY
* Data Sheet available from www.national.com
*
* We also support the DP83815 MacPHYER internal PHY since, for our
* purposes, they are compatible.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nsphyter.c,v 1.46 2020/03/28 18:37:18 thorpej 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 <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/nsphyterreg.h>

static int      nsphytermatch(device_t, cfdata_t, void *);
static void     nsphyterattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(nsphyter, sizeof(struct mii_softc),
   nsphytermatch, nsphyterattach, mii_phy_detach, mii_phy_activate);

static int      nsphyter_service(struct mii_softc *, struct mii_data *, int);
static void     nsphyter_status(struct mii_softc *);
static void     nsphyter_reset(struct mii_softc *);

static const struct mii_phy_funcs nsphyter_funcs = {
       nsphyter_service, nsphyter_status, nsphyter_reset,
};

static const struct mii_phydesc nsphyters[] = {
       MII_PHY_DESC(xxNATSEMI, DP83843),
       MII_PHY_DESC(xxNATSEMI, DP83847),
       MII_PHY_DESC(xxNATSEMI, DP83849),
       MII_PHY_DESC(xxNATSEMI, DP83815),
       MII_PHY_END,
};

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

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

       return 0;
}

static void
nsphyterattach(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, nsphyters);
       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 = &nsphyter_funcs;
       sc->mii_pdata = mii;
       sc->mii_flags = ma->mii_flags;

       mii_lock(mii);

       PHY_RESET(sc);

       PHY_READ(sc, MII_BMSR, &sc->mii_capabilities);
       sc->mii_capabilities &= ma->mii_capmask;

       mii_unlock(mii);

       mii_phy_add_media(sc);
}

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

       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;

               mii_phy_setmedia(sc);
               break;

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

               if (mii_phy_tick(sc) == EJUSTRETURN)
                       return 0;
               break;

       case MII_DOWN:
               mii_phy_down(sc);
               return 0;
       }

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

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

static void
nsphyter_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, physts;

       KASSERT(mii_locked(mii));

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

       PHY_READ(sc, MII_BMSR, &bmsr);
       PHY_READ(sc, MII_BMSR, &bmsr);
       PHY_READ(sc, MII_NSPHYTER_PHYSTS, &physts);

       if (physts & PHYSTS_LINK)
               mii->mii_media_status |= IFM_ACTIVE;

       PHY_READ(sc, 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) {
               /*
                * The media status bits are only valid if autonegotiation
                * has completed (or it's disabled).
                */
               if ((bmsr & BMSR_ACOMP) == 0) {
                       /* Erg, still trying, I guess... */
                       mii->mii_media_active |= IFM_NONE;
                       return;
               }

               if (physts & PHYSTS_SPEED10)
                       mii->mii_media_active |= IFM_10_T;
               else
                       mii->mii_media_active |= IFM_100_TX;

               if (physts & PHYSTS_DUPLEX)
                       mii->mii_media_active |=
                           IFM_FDX | mii_phy_flowstatus(sc);
               else
                       mii->mii_media_active |= IFM_HDX;
       } else
               mii->mii_media_active = ife->ifm_media;
}

static void
nsphyter_reset(struct mii_softc *sc)
{
       int i;
       uint16_t reg;

       KASSERT(mii_locked(sc->mii_pdata));

       if (sc->mii_flags & MIIF_NOISOLATE)
               reg = BMCR_RESET;
       else
               reg = BMCR_RESET | BMCR_ISO;
       PHY_WRITE(sc, MII_BMCR, reg);

       /*
        * It is best to allow a little time for the reset to settle
        * in before we start polling the BMCR again.  Notably, the
        * DP83840A manual states that there should be a 500us delay
        * between asserting software reset and attempting MII serial
        * operations.  Also, a DP83815 can get into a bad state on
        * cable removal and reinsertion if we do not delay here.
        */
       delay(500);

       /* Wait another 100ms for it to complete. */
       for (i = 0; i < 100; i++) {
               PHY_READ(sc, MII_BMCR, &reg);
               if ((reg & BMCR_RESET) == 0)
                       break;
               delay(1000);
       }

       if (sc->mii_inst != 0 && ((sc->mii_flags & MIIF_NOISOLATE) == 0))
               PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
}

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