/*      $NetBSD: nsphy.c,v 1.66 2020/03/15 23:04:50 thorpej 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.
*
* 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 DP83840A ethernet 10/100 PHY
* Data Sheet available from www.national.com
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nsphy.c,v 1.66 2020/03/15 23:04:50 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/nsphyreg.h>

static int      nsphymatch(device_t, cfdata_t, void *);
static void     nsphyattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(nsphy, sizeof(struct mii_softc),
   nsphymatch, nsphyattach, mii_phy_detach, mii_phy_activate);

static int      nsphy_service(struct mii_softc *, struct mii_data *, int);
static void     nsphy_status(struct mii_softc *);
static void     nsphy_reset(struct mii_softc *sc);

static const struct mii_phy_funcs nsphy_funcs = {
       nsphy_service, nsphy_status, nsphy_reset,
};

static const struct mii_phydesc nsphys[] = {
       MII_PHY_DESC(xxNATSEMI, DP83840),
       MII_PHY_END,
};

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

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

       return 0;
}

static void
nsphyattach(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, nsphys);
       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 = &nsphy_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
nsphy_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 (ife != NULL && 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 (ife != NULL && 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;

               PHY_READ(sc, MII_NSPHY_PCR, &reg);

               /*
                * Set up the PCR to use LED4 to indicate full-duplex
                * in both 10baseT and 100baseTX modes.
                */
               reg |= PCR_LED4MODE;

               /*
                * Make sure Carrier Integrity Monitor function is
                * disabled (normal for Node operation, but sometimes
                * it's not set?!)
                */
               reg |= PCR_CIMDIS;

               /*
                * Make sure "force link good" is set to normal mode.
                * It's only intended for debugging.
                */
               reg |= PCR_FLINK100;

               /*
                * Mystery bits which are supposedly `reserved',
                * but we seem to need to set them when the PHY
                * is connected to some interfaces:
                *
                * 0x0400 is needed for fxp
                *        (Intel EtherExpress Pro 10+/100B, 82557 chip)
                *        (nsphy with a DP83840 chip)
                * 0x0100 may be needed for some other card
                */
               reg |= 0x0100 | 0x0400;

               PHY_WRITE(sc, MII_NSPHY_PCR, reg);

               mii_phy_setmedia(sc);
               break;

       case MII_TICK:
               /* If we're not currently selected, just return. */
               if (ife != NULL && 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
nsphy_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, aner, anar, par, anlpar, result;

       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)
               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 PAR 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;
               }

               /*
                * Argh.  The PAR doesn't seem to indicate duplex mode
                * properly!  Determine media based on link partner's
                * advertised capabilities.
                */
               PHY_READ(sc, MII_ANER, &aner);
               if (aner & ANER_LPAN) {
                       PHY_READ(sc, MII_ANAR, &anar);
                       PHY_READ(sc, MII_ANLPAR, &anlpar);
                       result = anar & anlpar;
                       if (result & ANLPAR_TX_FD)
                               mii->mii_media_active |= IFM_100_TX | IFM_FDX;
                       else if (result & ANLPAR_T4)
                               mii->mii_media_active |= IFM_100_T4 | IFM_HDX;
                       else if (result & ANLPAR_TX)
                               mii->mii_media_active |= IFM_100_TX | IFM_HDX;
                       else if (result & ANLPAR_10_FD)
                               mii->mii_media_active |= IFM_10_T | IFM_FDX;
                       else if (result & ANLPAR_10)
                               mii->mii_media_active |= IFM_10_T | IFM_HDX;
                       else
                               mii->mii_media_active |= IFM_NONE;
                       return;
               }

               /*
                * Link partner is not capable of autonegotiation.
                * We will never be in full-duplex mode if this is
                * the case, so reading the PAR is OK.
                */
               PHY_READ(sc, MII_NSPHY_PAR, &par);
               if (par & PAR_10)
                       mii->mii_media_active |= IFM_10_T;
               else
                       mii->mii_media_active |= IFM_100_TX;
               mii->mii_media_active |= IFM_HDX;
       } else
               mii->mii_media_active = ife->ifm_media;
}

static void
nsphy_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);

       /*
        * Give it a little time to settle in case we just got power.
        * The DP83840A data sheet suggests that a soft reset not happen
        * within 500us of power being applied.  Be conservative.
        */
       delay(1000);

       /*
        * Wait another 2s for it to complete.
        * This is only a little overkill as under normal circumstances
        * the PHY can take up to 1s to complete reset.
        * This is also a bit odd because after a reset, the BMCR will
        * clear the reset bit and simply reports 0 even though the reset
        * is not yet complete.
        */
       for (i = 0; i < 1000; i++) {
               PHY_READ(sc, MII_BMCR, &reg);
               if (reg && ((reg & BMCR_RESET) == 0))
                       break;
               delay(2000);
       }

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

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