FreeBSD/Linux Kernel Cross Reference
sys/dev/mii/mlphy.c

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 1997, 1998, 1999
      *      Bill Paul <wpaul@ctr.columbia.edu>.  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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Bill Paul.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
     * 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.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * driver for Micro Linear 6692 PHYs
     *
     * The Micro Linear 6692 is a strange beast, and dealing with it using
     * this code framework is tricky. The 6692 is actually a 100Mbps-only
     * device, which means that a second PHY is required to support 10Mbps
     * modes. However, even though the 6692 does not support 10Mbps modes,
     * it can still advertise them when performing autonegotiation. If a
     * 10Mbps mode is negotiated, we must program the registers of the
     * companion PHY accordingly in addition to programming the registers
     * of the 6692.
     *
     * This device also does not have vendor/device ID registers.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/socket.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/malloc.h>
    
    #include <net/if.h>
    #include <net/if_media.h>
    
    #include <dev/mii/mii.h>
    #include <dev/mii/miivar.h>
    
    #include "miibus_if.h"
    
    #define ML_STATE_AUTO_SELF      1
    #define ML_STATE_AUTO_OTHER     2
    
    struct mlphy_softc      {
            struct mii_softc        ml_mii;
            device_t                ml_dev;
            int                     ml_state;
            int                     ml_linked;
    };
    
    static int mlphy_probe(device_t);
    static int mlphy_attach(device_t);
    
    static device_method_t mlphy_methods[] = {
            /* device interface */
            DEVMETHOD(device_probe,         mlphy_probe),
            DEVMETHOD(device_attach,        mlphy_attach),
            DEVMETHOD(device_detach,        mii_phy_detach),
            DEVMETHOD(device_shutdown,      bus_generic_shutdown),
            DEVMETHOD_END
    };
    
    static devclass_t mlphy_devclass;
    
    static driver_t mlphy_driver = {
            "mlphy",
            mlphy_methods,
            sizeof(struct mlphy_softc)
    };
    
   DRIVER_MODULE(mlphy, miibus, mlphy_driver, mlphy_devclass, 0, 0);
   
   static struct mii_softc *mlphy_find_other(struct mlphy_softc *);
   static int      mlphy_service(struct mii_softc *, struct mii_data *, int);
   static void     mlphy_reset(struct mii_softc *);
   static void     mlphy_status(struct mii_softc *);
   
   static const struct mii_phy_funcs mlphy_funcs = {
           mlphy_service,
           mlphy_status,
           mlphy_reset
   };
   
   static int
   mlphy_probe(dev)
           device_t                dev;
   {
           struct mii_attach_args  *ma;
   
           ma = device_get_ivars(dev);
   
           /*
            * Micro Linear PHY reports oui == 0 model == 0
            */
           if (MII_OUI(ma->mii_id1, ma->mii_id2) != 0 ||
               MII_MODEL(ma->mii_id2) != 0)
                   return (ENXIO);
   
           /*
            * Make sure the parent is a `tl'. So far, I have only
            * encountered the 6692 on an Olicom card with a ThunderLAN
            * controller chip.
            */
           if (!mii_dev_mac_match(dev, "tl"))
                   return (ENXIO);
   
           device_set_desc(dev, "Micro Linear 6692 media interface");
   
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
   mlphy_attach(dev)
           device_t                dev;
   {
           struct mlphy_softc *msc;
           struct mii_softc *sc;
   
           msc = device_get_softc(dev);
           sc = &msc->ml_mii;
           msc->ml_dev = dev;
           mii_phy_dev_attach(dev, MIIF_NOMANPAUSE, &mlphy_funcs, 0);
   
           PHY_RESET(sc);
   
           sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & sc->mii_capmask;
           /* Let the companion PHY (if any) only handle the media we don't. */
           sc->mii_capmask = ~sc->mii_capabilities;
           device_printf(dev, " ");
           mii_phy_add_media(sc);
           printf("\n");
   
           MIIBUS_MEDIAINIT(sc->mii_dev);
           return (0);
   }
   
   static struct mii_softc *
   mlphy_find_other(struct mlphy_softc *msc)
   {
           device_t                *devlist;
           struct mii_softc *retval;
           int i, devs;
   
           retval = NULL;
           if (device_get_children(msc->ml_mii.mii_dev, &devlist, &devs) != 0)
                   return (NULL);
           for (i = 0; i < devs; i++) {
                   if (devlist[i] != msc->ml_dev) {
                           retval = device_get_softc(devlist[i]);
                           break;
                   }
           }
           free(devlist, M_TEMP);
           return (retval);
   }
   
   static int
   mlphy_service(xsc, mii, cmd)
           struct mii_softc *xsc;
           struct mii_data *mii;
           int cmd;
   {
           struct ifmedia_entry    *ife = mii->mii_media.ifm_cur;
           struct mii_softc        *other = NULL;
           struct mlphy_softc      *msc = (struct mlphy_softc *)xsc;
           struct mii_softc        *sc = (struct mii_softc *)&msc->ml_mii;
           int                     other_inst, reg;
   
           /*
            * See if there's another PHY on this bus with us.
            * If so, we may need it for 10Mbps modes.
            */
           other = mlphy_find_other(msc);
   
           switch (cmd) {
           case MII_POLLSTAT:
                   break;
   
           case MII_MEDIACHG:
                   switch (IFM_SUBTYPE(ife->ifm_media)) {
                   case IFM_AUTO:
                           /*
                            * For autonegotiation, reset and isolate the
                            * companion PHY (if any) and then do NWAY
                            * autonegotiation ourselves.
                            */
                           msc->ml_state = ML_STATE_AUTO_SELF;
                           if (other != NULL) {
                                   PHY_RESET(other);
                                   PHY_WRITE(other, MII_BMCR, BMCR_ISO);
                           }
                           (void)mii_phy_auto(sc);
                           msc->ml_linked = 0;
                           return (0);
                   case IFM_10_T:
                   case IFM_100_TX:
                           /*
                            * For 10baseT and 100baseTX modes, reset and isolate
                            * the companion PHY (if any), then program ourselves
                            * accordingly.
                            */
                           if (other != NULL) {
                                   PHY_RESET(other);
                                   PHY_WRITE(other, MII_BMCR, BMCR_ISO);
                           }
                           mii_phy_setmedia(sc);
                           msc->ml_state = 0;
                           break;
                   default:
                           return (EINVAL);
   
                   }
                   break;
   
           case MII_TICK:
                   /*
                    * Only used for autonegotiation.
                    */
                   if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
                           break;
   
                   /*
                    * Check to see if we have link.  If we do, we don't
                    * need to restart the autonegotiation process.  Read
                    * the BMSR twice in case it's latched.
                    * If we're in a 10Mbps mode, check the link of the
                    * 10Mbps PHY. Sometimes the Micro Linear PHY's
                    * linkstat bit will clear while the linkstat bit of
                    * the companion PHY will remain set.
                    */
                   if (msc->ml_state == ML_STATE_AUTO_OTHER) {
                           reg = PHY_READ(other, MII_BMSR) |
                               PHY_READ(other, MII_BMSR);
                   } else {
                           reg = PHY_READ(sc, MII_BMSR) |
                               PHY_READ(sc, MII_BMSR);
                   }
   
                   if (reg & BMSR_LINK) {
                           if (!msc->ml_linked) {
                                   msc->ml_linked = 1;
                                   PHY_STATUS(sc);
                           }
                           break;
                   }
   
                   /*
                    * Only retry autonegotiation every 5 seconds.
                    */
                   if (++sc->mii_ticks <= MII_ANEGTICKS)
                           break;
   
                   sc->mii_ticks = 0;
                   msc->ml_linked = 0;
                   mii->mii_media_active = IFM_NONE;
                   PHY_RESET(sc);
                   msc->ml_state = ML_STATE_AUTO_SELF;
                   if (other != NULL) {
                           PHY_RESET(other);
                           PHY_WRITE(other, MII_BMCR, BMCR_ISO);
                   }
                   mii_phy_auto(sc);
                   return (0);
           }
   
           /* Update the media status. */
   
           if (msc->ml_state == ML_STATE_AUTO_OTHER) {
                   other_inst = other->mii_inst;
                   other->mii_inst = sc->mii_inst;
                   if (IFM_INST(ife->ifm_media) == other->mii_inst)
                           (void)PHY_SERVICE(other, mii, MII_POLLSTAT);
                   other->mii_inst = other_inst;
                   sc->mii_media_active = other->mii_media_active;
                   sc->mii_media_status = other->mii_media_status;
           } else
                   ukphy_status(sc);
   
           /* Callback if something changed. */
           mii_phy_update(sc, cmd);
           return (0);
   }
   
   /*
    * The Micro Linear PHY comes out of reset with the 'autoneg
    * enable' bit set, which we don't want.
    */
   static void
   mlphy_reset(sc)
           struct mii_softc        *sc;
   {
           int                     reg;
   
           mii_phy_reset(sc);
           reg = PHY_READ(sc, MII_BMCR);
           reg &= ~BMCR_AUTOEN;
           PHY_WRITE(sc, MII_BMCR, reg);
   }
   
   /*
    * If we negotiate a 10Mbps mode, we need to check for an alternate
    * PHY and make sure it's enabled and set correctly.
    */
   static void
   mlphy_status(sc)
           struct mii_softc        *sc;
   {
           struct mlphy_softc      *msc = (struct mlphy_softc *)sc;
           struct mii_data         *mii = msc->ml_mii.mii_pdata;
           struct mii_softc        *other = NULL;
   
           /* See if there's another PHY on the bus with us. */
           other = mlphy_find_other(msc);
           if (other == NULL)
                   return;
   
           ukphy_status(sc);
   
           if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) {
                   msc->ml_state = ML_STATE_AUTO_SELF;
                   PHY_RESET(other);
                   PHY_WRITE(other, MII_BMCR, BMCR_ISO);
           }
   
           if (IFM_SUBTYPE(mii->mii_media_active) == IFM_10_T) {
                   msc->ml_state = ML_STATE_AUTO_OTHER;
                   PHY_RESET(&msc->ml_mii);
                   PHY_WRITE(&msc->ml_mii, MII_BMCR, BMCR_ISO);
                   PHY_RESET(other);
                   mii_phy_auto(other);
           }
   }

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