/*      $NetBSD: ukphy.c,v 1.55 2021/06/29 21:03:36 pgoyette Exp $      */

/*-
* Copyright (c) 1998, 1999, 2000 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.
*/

/*
* 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 generic unknown PHYs
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ukphy.c,v 1.55 2021/06/29 21:03:36 pgoyette Exp $");

#ifdef _KERNEL_OPT
#include "opt_mii.h"
#endif

#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>

static int      ukphymatch(device_t, cfdata_t, void *);
static void     ukphyattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ukphy, sizeof(struct mii_softc),
   ukphymatch, ukphyattach, mii_phy_detach, mii_phy_activate);

static int      ukphy_service(struct mii_softc *, struct mii_data *, int);

static const struct mii_phy_funcs ukphy_funcs = {
       ukphy_service, ukphy_status, mii_phy_reset,
};

static int
ukphymatch(device_t parent, cfdata_t match, void *aux)
{

       /*
        * We know something is here, so always match at a low priority.
        */
       return 1;
}

static void
ukphyattach(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;
       int oui = MII_OUI(ma->mii_id1, ma->mii_id2);
       int model = MII_MODEL(ma->mii_id2);
       int rev = MII_REV(ma->mii_id2);
       char descr[MII_MAX_DESCR_LEN];

       if (mii_get_descr(descr, sizeof(descr), oui, model) && descr[0])
               aprint_normal(": %s (OUI 0x%06x, model 0x%04x), rev. %d\n",
                      descr, oui, model, rev);
       else
               aprint_normal(": OUI 0x%06x, model 0x%04x, rev. %d\n",
                      oui, model, rev);
       aprint_naive(": Media interface\n");

       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 = &ukphy_funcs;
       sc->mii_pdata = mii;
       sc->mii_flags = ma->mii_flags;

       /*
        * Don't do loopback on unknown PHYs.  It might confuse some of them.
        */
       sc->mii_flags |= 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
ukphy_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;
}

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