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

     /*-
      * Copyright (c) 2001-2003, Shunsuke Akiyama <akiyama@FreeBSD.org>.
      * 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 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 AUTHOR 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.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * driver for RealTek RTL8150 internal PHY
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/socket.h>
    #include <sys/bus.h>
    
    #include <net/if.h>
    #include <net/if_arp.h>
    #include <net/if_media.h>
    
    #include <dev/mii/mii.h>
    #include <dev/mii/miivar.h>
    #include "miidevs.h"
    
    #include <machine/bus.h>
    #include <dev/mii/ruephyreg.h>
    
    #include "miibus_if.h"
    
    static int ruephy_probe(device_t);
    static int ruephy_attach(device_t);
    
    static device_method_t ruephy_methods[] = {
            /* device interface */
            DEVMETHOD(device_probe,         ruephy_probe),
            DEVMETHOD(device_attach,        ruephy_attach),
            DEVMETHOD(device_detach,        mii_phy_detach),
            DEVMETHOD(device_shutdown,      bus_generic_shutdown),
            { 0, 0 }
    };
    
    static devclass_t ruephy_devclass;
    
    static driver_t ruephy_driver = {
            "ruephy",
            ruephy_methods,
            sizeof(struct mii_softc)
    };
    
    DRIVER_MODULE(ruephy, miibus, ruephy_driver, ruephy_devclass, 0, 0);
    
    static int ruephy_service(struct mii_softc *, struct mii_data *, int);
    static void ruephy_reset(struct mii_softc *);
    static void ruephy_status(struct mii_softc *);
    
    /*
     * The RealTek RTL8150 internal PHY doesn't have vendor/device ID
     * registers; rue(4) fakes up a return value of all zeros.
     */
    static const struct mii_phydesc ruephys[] = {
            { 0, 0, "RealTek RTL8150 internal media interface" },
            MII_PHY_END
    };
    
    static int
    ruephy_probe(device_t dev)
    {
    
            if (strcmp(device_get_name(device_get_parent(device_get_parent(dev))),
                "rue") == 0)
                    return (mii_phy_dev_probe(dev, ruephys, BUS_PROBE_DEFAULT));
            return (ENXIO);
    }
   
   static int
   ruephy_attach(device_t dev)
   {
           struct mii_softc        *sc;
           struct mii_attach_args  *ma;
           struct mii_data         *mii;
   
           sc = device_get_softc(dev);
           ma = device_get_ivars(dev);
           sc->mii_dev = device_get_parent(dev);
           mii = device_get_softc(sc->mii_dev);
   
           /*
            * The RealTek PHY can never be isolated, so never allow non-zero
            * instances!
            */
           if (mii->mii_instance != 0) {
                   device_printf(dev, "ignoring this PHY, non-zero instance\n");
                   return (ENXIO);
           }
   
           LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list);
   
           sc->mii_inst = mii->mii_instance;
           sc->mii_phy = ma->mii_phyno;
           sc->mii_service = ruephy_service;
           sc->mii_pdata = mii;
           mii->mii_instance++;
   
           /*
            * Apparently, we can't neither isolate nor do loopback on this PHY.
            */
           sc->mii_flags |= MIIF_NOISOLATE | MIIF_NOLOOP;
   
           ruephy_reset(sc);
   
           sc->mii_capabilities =
               PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
           device_printf(dev, " ");
           mii_phy_add_media(sc);
           printf("\n");
   
           MIIBUS_MEDIAINIT(sc->mii_dev);
           return (0);
   }
   
   static int
   ruephy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
   {
           struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
           int reg;
   
           /*
            * We can't isolate the RealTek RTL8150 PHY,
            * so it has to be the only one!
            */
           if (IFM_INST(ife->ifm_media) != sc->mii_inst)
                   panic("ruephy_service: can't isolate RealTek RTL8150 PHY");
   
           switch (cmd) {
           case MII_POLLSTAT:
                   break;
   
           case MII_MEDIACHG:
                   /*
                    * 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:
                   /*
                    * Is the interface even up?
                    */
                   if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                           return (0);
   
                   /*
                    * 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 MSR twice in case it's latched.
                    */
                   reg = PHY_READ(sc, RUEPHY_MII_MSR) |
                       PHY_READ(sc, RUEPHY_MII_MSR);
                   if (reg & RUEPHY_MSR_LINK)
                           break;
   
                   /*
                    * Only retry autonegotiation every 5 seconds.
                    */
                   if (++sc->mii_ticks <= MII_ANEGTICKS)
                           break;
   
                   sc->mii_ticks = 0;
                   ruephy_reset(sc);
                   if (mii_phy_auto(sc) == EJUSTRETURN)
                           return (0);
                   break;
           }
   
           /* Update the media status. */
           ruephy_status(sc);
   
           /* Callback if something changed. */
           mii_phy_update(sc, cmd);
   
           return (0);
   }
   
   static void
   ruephy_reset(struct mii_softc *sc)
   {
   
           mii_phy_reset(sc);
   
           /*
            * XXX RealTek RTL8150 PHY doesn't set the BMCR properly after
            * XXX reset, which breaks autonegotiation.
            */
           PHY_WRITE(sc, MII_BMCR, (BMCR_S100 | BMCR_AUTOEN | BMCR_FDX));
   }
   
   static void
   ruephy_status(struct mii_softc *phy)
   {
           struct mii_data *mii = phy->mii_pdata;
           struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
           int bmsr, bmcr, msr;
   
           mii->mii_media_status = IFM_AVALID;
           mii->mii_media_active = IFM_ETHER;
   
           msr = PHY_READ(phy, RUEPHY_MII_MSR) | PHY_READ(phy, RUEPHY_MII_MSR);
           if (msr & RUEPHY_MSR_LINK)
                   mii->mii_media_status |= IFM_ACTIVE;
   
           bmcr = PHY_READ(phy, MII_BMCR);
           if (bmcr & BMCR_ISO) {
                   mii->mii_media_active |= IFM_NONE;
                   mii->mii_media_status = 0;
                   return;
           }
   
           bmsr = PHY_READ(phy, MII_BMSR) | PHY_READ(phy, MII_BMSR);
           if (bmcr & BMCR_AUTOEN) {
                   if ((bmsr & BMSR_ACOMP) == 0) {
                           /* Erg, still trying, I guess... */
                           mii->mii_media_active |= IFM_NONE;
                           return;
                   }
   
                   if (msr & RUEPHY_MSR_SPEED100)
                           mii->mii_media_active |= IFM_100_TX;
                   else
                           mii->mii_media_active |= IFM_10_T;
   
                   if (msr & RUEPHY_MSR_DUPLEX)
                           mii->mii_media_active |= IFM_FDX;
           } else
                   mii->mii_media_active = ife->ifm_media;
   }

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