/* $NetBSD: smscphy.c,v 1.4 2021/08/25 21:50:29 andvar Exp $ */

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*/

/* $FreeBSD: head/sys/dev/mii/smscphy.c 326255 2017-11-27 14:52:40Z pfg $ */

/*
* Driver for the SMSC LAN8710A
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: smscphy.c,v 1.4 2021/08/25 21:50:29 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 <net/if.h>
#include <net/if_media.h>

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

/* PHY special control/status register */
#define SMSCPHY_SPCSR   0x1f
#define  SPCSR_SPDIND_10        0x0004
#define  SPCSR_SPDIND_100       0x0008
#define  SPCSR_SPDIND_SPDMASK   0x000c
#define  SPCSR_SPDIND_FDX       0x0010

static int      smscphy_match(device_t, cfdata_t, void *);
static void     smscphy_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(smscphy, sizeof (struct mii_softc),
   smscphy_match, smscphy_attach, mii_phy_detach, mii_phy_activate);

static void     smscphy_power(struct mii_softc *, bool);
static int      smscphy_service(struct mii_softc *, struct mii_data *, int);
static void     smscphy_auto(struct mii_softc *, int);
static void     smscphy_status(struct mii_softc *);

static const struct mii_phydesc smscphys[] = {
       MII_PHY_DESC(SMSC, LAN8700),
       MII_PHY_DESC(SMSC, LAN8710_LAN8720),
       MII_PHY_END
};

static const struct mii_phy_funcs smscphy_funcs = {
       smscphy_service,
       smscphy_status,
       mii_phy_reset
};

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

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

       return 0;
}

static void
smscphy_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, smscphys);
       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 = &smscphy_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;

       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 void
smscphy_power(struct mii_softc *sc, bool power)
{
       uint16_t bmcr, new;

       PHY_READ(sc, MII_BMCR, &bmcr);
       if (power)
               new = bmcr & ~BMCR_PDOWN;
       else
               new = bmcr | BMCR_PDOWN;
       if (bmcr != new)
               PHY_WRITE(sc, MII_BMCR, new);
}

static int
smscphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
       struct  ifmedia_entry *ife;
       uint16_t reg;

       KASSERT(mii_locked(mii));

       ife = mii->mii_media.ifm_cur;

       switch (cmd) {
       case MII_POLLSTAT:
               break;

       case MII_MEDIACHG:
               /* Try to power up the PHY in case it's down */
               if (IFM_SUBTYPE(ife->ifm_media) != IFM_NONE)
                       smscphy_power(sc, true);

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

               default:
                       mii_phy_setmedia(sc);
                       if (IFM_SUBTYPE(ife->ifm_media) == IFM_NONE)
                               smscphy_power(sc, false);
                       break;
               }
               break;

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

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

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

               PHY_RESET(sc);
               smscphy_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
smscphy_auto(struct mii_softc *sc, int media)
{
       uint16_t anar;

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

static void
smscphy_status(struct mii_softc *sc)
{
       struct mii_data *mii = sc->mii_pdata;
       uint16_t bmcr, bmsr, status;

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

       PHY_READ(sc, SMSCPHY_SPCSR, &status);
       if ((status & SPCSR_SPDIND_SPDMASK) == SPCSR_SPDIND_100)
               mii->mii_media_active |= IFM_100_TX;
       else
               mii->mii_media_active |= IFM_10_T;
       if (status & SPCSR_SPDIND_FDX)
               mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
       else
               mii->mii_media_active |= IFM_HDX;
}

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