mii_physubr.c

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    1 /*      $NetBSD: mii_physubr.c,v 1.5 1999/08/03 19:41:49 drochner Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
    9  * NASA Ames Research Center.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the NetBSD
   22  *      Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 /*
   44  * Subroutines common to all PHYs.
   45  */
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/kernel.h>
   50 #include <sys/socket.h>
   51 #include <sys/errno.h>
   52 #include <sys/module.h>
   53 #include <sys/bus.h>
   54 
   55 #include <net/if.h>
   56 #include <net/if_media.h>
   57 
   58 #include <dev/mii/mii.h>
   59 #include <dev/mii/miivar.h>
   60 
   61 #include "miibus_if.h"
   62 
   63 /*
   64  * Media to register setting conversion table.  Order matters.
   65  */
   66 const struct mii_media mii_media_table[MII_NMEDIA] = {
   67         /* None */
   68         { BMCR_ISO,             ANAR_CSMA,
   69           0, },
   70 
   71         /* 10baseT */
   72         { BMCR_S10,             ANAR_CSMA|ANAR_10,
   73           0, },
   74 
   75         /* 10baseT-FDX */
   76         { BMCR_S10|BMCR_FDX,    ANAR_CSMA|ANAR_10_FD,
   77           0, },
   78 
   79         /* 100baseT4 */
   80         { BMCR_S100,            ANAR_CSMA|ANAR_T4,
   81           0, },
   82 
   83         /* 100baseTX */
   84         { BMCR_S100,            ANAR_CSMA|ANAR_TX,
   85           0, },
   86 
   87         /* 100baseTX-FDX */
   88         { BMCR_S100|BMCR_FDX,   ANAR_CSMA|ANAR_TX_FD,
   89           0, },
   90 
   91         /* 1000baseX */
   92         { BMCR_S1000,           ANAR_CSMA,
   93           0, },
   94 
   95         /* 1000baseX-FDX */
   96         { BMCR_S1000|BMCR_FDX,  ANAR_CSMA,
   97           0, },
   98 
   99         /* 1000baseT */
  100         { BMCR_S1000,           ANAR_CSMA,
  101           GTCR_ADV_1000THDX },
  102 
  103         /* 1000baseT-FDX */
  104         { BMCR_S1000,           ANAR_CSMA,
  105           GTCR_ADV_1000TFDX },
  106 };
  107 
  108 void
  109 mii_phy_setmedia(struct mii_softc *sc)
  110 {
  111         struct mii_data *mii = sc->mii_pdata;
  112         struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
  113         int bmcr, anar, gtcr;
  114 
  115         if (IFM_SUBTYPE(ife->ifm_media) == IFM_AUTO) {
  116                 if ((PHY_READ(sc, MII_BMCR) & BMCR_AUTOEN) == 0 ||
  117                     (sc->mii_flags & MIIF_FORCEANEG))
  118                         (void) mii_phy_auto(sc);
  119                 return;
  120         }
  121 
  122         /*
  123          * Table index is stored in the media entry.
  124          */
  125 
  126         KASSERT(ife->ifm_data >=0 && ife->ifm_data < MII_NMEDIA,
  127             ("invalid ife->ifm_data (0x%x) in mii_phy_setmedia",
  128             ife->ifm_data));
  129 
  130         anar = mii_media_table[ife->ifm_data].mm_anar;
  131         bmcr = mii_media_table[ife->ifm_data].mm_bmcr;
  132         gtcr = mii_media_table[ife->ifm_data].mm_gtcr;
  133 
  134         if (mii->mii_media.ifm_media & IFM_ETH_MASTER) {
  135                 switch (IFM_SUBTYPE(ife->ifm_media)) {
  136                 case IFM_1000_T:
  137                         gtcr |= GTCR_MAN_MS|GTCR_ADV_MS;
  138                         break;
  139 
  140                 default:
  141                         panic("mii_phy_setmedia: MASTER on wrong media");
  142                 }
  143         }
  144 
  145         if (ife->ifm_media & IFM_LOOP)
  146                 bmcr |= BMCR_LOOP;
  147 
  148         PHY_WRITE(sc, MII_ANAR, anar);
  149         PHY_WRITE(sc, MII_BMCR, bmcr);
  150         if (sc->mii_flags & MIIF_HAVE_GTCR)
  151                 PHY_WRITE(sc, MII_100T2CR, gtcr);
  152 }
  153 
  154 int
  155 mii_phy_auto(struct mii_softc *sc)
  156 {
  157 
  158         /*
  159          * Check for 1000BASE-X.  Autonegotiation is a bit
  160          * different on such devices.
  161          */
  162         if (sc->mii_flags & MIIF_IS_1000X) {
  163                 uint16_t anar = 0;
  164 
  165                 if (sc->mii_extcapabilities & EXTSR_1000XFDX)
  166                         anar |= ANAR_X_FD;
  167                 if (sc->mii_extcapabilities & EXTSR_1000XHDX)
  168                         anar |= ANAR_X_HD;
  169 
  170                 if (sc->mii_flags & MIIF_DOPAUSE) {
  171                         /* XXX Asymmetric vs. symmetric? */
  172                         anar |= ANLPAR_X_PAUSE_TOWARDS;
  173                 }
  174 
  175                 PHY_WRITE(sc, MII_ANAR, anar);
  176         } else {
  177                 uint16_t anar;
  178 
  179                 anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) |
  180                     ANAR_CSMA;
  181                 if (sc->mii_flags & MIIF_DOPAUSE)
  182                         anar |= ANAR_FC;
  183                 PHY_WRITE(sc, MII_ANAR, anar);
  184                 if (sc->mii_flags & MIIF_HAVE_GTCR) {
  185                         uint16_t gtcr = 0;
  186 
  187                         if (sc->mii_extcapabilities & EXTSR_1000TFDX)
  188                                 gtcr |= GTCR_ADV_1000TFDX;
  189                         if (sc->mii_extcapabilities & EXTSR_1000THDX)
  190                                 gtcr |= GTCR_ADV_1000THDX;
  191 
  192                         PHY_WRITE(sc, MII_100T2CR, gtcr);
  193                 }
  194         }
  195         PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
  196         return (EJUSTRETURN);
  197 }
  198 
  199 int
  200 mii_phy_tick(struct mii_softc *sc)
  201 {
  202         struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
  203         struct ifnet *ifp = sc->mii_pdata->mii_ifp;
  204         int reg;
  205 
  206         /* Just bail now if the interface is down. */
  207         if ((ifp->if_flags & IFF_UP) == 0)
  208                 return (EJUSTRETURN);
  209 
  210         /*
  211          * If we're not doing autonegotiation, we don't need to do
  212          * any extra work here.  However, we need to check the link
  213          * status so we can generate an announcement if the status
  214          * changes.
  215          */
  216         if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
  217                 sc->mii_ticks = 0;      /* reset autonegotiation timer. */
  218                 return (0);
  219         }
  220 
  221         /* Read the status register twice; BMSR_LINK is latch-low. */
  222         reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
  223         if (reg & BMSR_LINK) {
  224                 sc->mii_ticks = 0;      /* reset autonegotiation timer. */
  225                 /* See above. */
  226                 return (0);
  227         }
  228 
  229         /* Announce link loss right after it happens */
  230         if (sc->mii_ticks++ == 0)
  231                 return (0);
  232 
  233         /* XXX: use default value if phy driver did not set mii_anegticks */
  234         if (sc->mii_anegticks == 0)
  235                 sc->mii_anegticks = MII_ANEGTICKS_GIGE;
  236 
  237         /* Only retry autonegotiation every mii_anegticks ticks. */
  238         if (sc->mii_ticks <= sc->mii_anegticks)
  239                 return (EJUSTRETURN);
  240 
  241         sc->mii_ticks = 0;
  242         mii_phy_reset(sc);
  243         mii_phy_auto(sc);
  244         return (0);
  245 }
  246 
  247 void
  248 mii_phy_reset(struct mii_softc *sc)
  249 {
  250         struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
  251         int reg, i;
  252 
  253         if (sc->mii_flags & MIIF_NOISOLATE)
  254                 reg = BMCR_RESET;
  255         else
  256                 reg = BMCR_RESET | BMCR_ISO;
  257         PHY_WRITE(sc, MII_BMCR, reg);
  258 
  259         /* Wait 100ms for it to complete. */
  260         for (i = 0; i < 100; i++) {
  261                 reg = PHY_READ(sc, MII_BMCR);
  262                 if ((reg & BMCR_RESET) == 0)
  263                         break;
  264                 DELAY(1000);
  265         }
  266 
  267         if ((sc->mii_flags & MIIF_NOISOLATE) == 0) {
  268                 if ((ife == NULL && sc->mii_inst != 0) ||
  269                     (ife != NULL && IFM_INST(ife->ifm_media) != sc->mii_inst))
  270                         PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
  271         }
  272 }
  273 
  274 void
  275 mii_phy_down(struct mii_softc *sc)
  276 {
  277 
  278 }
  279 
  280 void
  281 mii_phy_update(struct mii_softc *sc, int cmd)
  282 {
  283         struct mii_data *mii = sc->mii_pdata;
  284 
  285         if (sc->mii_media_active != mii->mii_media_active ||
  286             cmd == MII_MEDIACHG) {
  287                 MIIBUS_STATCHG(sc->mii_dev);
  288                 sc->mii_media_active = mii->mii_media_active;
  289         }
  290         if (sc->mii_media_status != mii->mii_media_status) {
  291                 MIIBUS_LINKCHG(sc->mii_dev);
  292                 sc->mii_media_status = mii->mii_media_status;
  293         }
  294 }
  295 
  296 /*
  297  * Given an ifmedia word, return the corresponding ANAR value.
  298  */
  299 int
  300 mii_anar(int media)
  301 {
  302         int rv;
  303 
  304         switch (media & (IFM_TMASK|IFM_NMASK|IFM_FDX)) {
  305         case IFM_ETHER|IFM_10_T:
  306                 rv = ANAR_10|ANAR_CSMA;
  307                 break;
  308         case IFM_ETHER|IFM_10_T|IFM_FDX:
  309                 rv = ANAR_10_FD|ANAR_CSMA;
  310                 break;
  311         case IFM_ETHER|IFM_100_TX:
  312                 rv = ANAR_TX|ANAR_CSMA;
  313                 break;
  314         case IFM_ETHER|IFM_100_TX|IFM_FDX:
  315                 rv = ANAR_TX_FD|ANAR_CSMA;
  316                 break;
  317         case IFM_ETHER|IFM_100_T4:
  318                 rv = ANAR_T4|ANAR_CSMA;
  319                 break;
  320         default:
  321                 rv = 0;
  322                 break;
  323         }
  324 
  325         return (rv);
  326 }
  327 
  328 /*
  329  * Initialize generic PHY media based on BMSR, called when a PHY is
  330  * attached.  We expect to be set up to print a comma-separated list
  331  * of media names.  Does not print a newline.
  332  */
  333 void
  334 mii_add_media(struct mii_softc *sc)
  335 {
  336         const char *sep = "";
  337         struct mii_data *mii;
  338 
  339         mii = device_get_softc(sc->mii_dev);
  340         if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0) {
  341                 printf("no media present");
  342                 return;
  343         }
  344 
  345 #define ADD(m, c)       ifmedia_add(&mii->mii_media, (m), (c), NULL)
  346 #define PRINT(s)        printf("%s%s", sep, s); sep = ", "
  347 
  348         if (sc->mii_capabilities & BMSR_10THDX) {
  349                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, 0, sc->mii_inst), 0);
  350                 PRINT("10baseT");
  351         }
  352         if (sc->mii_capabilities & BMSR_10TFDX) {
  353                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, IFM_FDX, sc->mii_inst),
  354                     BMCR_FDX);
  355                 PRINT("10baseT-FDX");
  356         }
  357         if (sc->mii_capabilities & BMSR_100TXHDX) {
  358                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, 0, sc->mii_inst),
  359                     BMCR_S100);
  360                 PRINT("100baseTX");
  361         }
  362         if (sc->mii_capabilities & BMSR_100TXFDX) {
  363                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_FDX, sc->mii_inst),
  364                     BMCR_S100|BMCR_FDX);
  365                 PRINT("100baseTX-FDX");
  366         }
  367         if (sc->mii_capabilities & BMSR_100T4) {
  368                 /*
  369                  * XXX How do you enable 100baseT4?  I assume we set
  370                  * XXX BMCR_S100 and then assume the PHYs will take
  371                  * XXX watever action is necessary to switch themselves
  372                  * XXX into T4 mode.
  373                  */
  374                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_T4, 0, sc->mii_inst),
  375                     BMCR_S100);
  376                 PRINT("100baseT4");
  377         }
  378         if (sc->mii_capabilities & BMSR_ANEG) {
  379                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_AUTO, 0, sc->mii_inst),
  380                     BMCR_AUTOEN);
  381                 PRINT("auto");
  382         }
  383 
  384 
  385 
  386 #undef ADD
  387 #undef PRINT
  388 }
  389 
  390 /*
  391  * Initialize generic PHY media based on BMSR, called when a PHY is
  392  * attached.  We expect to be set up to print a comma-separated list
  393  * of media names.  Does not print a newline.
  394  */
  395 void
  396 mii_phy_add_media(struct mii_softc *sc)
  397 {
  398         struct mii_data *mii = sc->mii_pdata;
  399         const char *sep = "";
  400 
  401         if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0 &&
  402             (sc->mii_extcapabilities & EXTSR_MEDIAMASK) == 0) {
  403                 printf("no media present");
  404                 return;
  405         }
  406 
  407         /* Set aneg timer for 10/100 media. Gigabit media handled below. */
  408         sc->mii_anegticks = MII_ANEGTICKS;
  409 
  410 #define ADD(m, c)       ifmedia_add(&mii->mii_media, (m), (c), NULL)
  411 #define PRINT(s)        printf("%s%s", sep, s); sep = ", "
  412 
  413         if ((sc->mii_flags & MIIF_NOISOLATE) == 0)
  414                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_NONE, 0, sc->mii_inst),
  415                     MII_MEDIA_NONE);
  416 
  417         /*
  418          * There are different interpretations for the bits in
  419          * HomePNA PHYs.  And there is really only one media type
  420          * that is supported.
  421          */
  422         if (sc->mii_flags & MIIF_IS_HPNA) {
  423                 if (sc->mii_capabilities & BMSR_10THDX) {
  424                         ADD(IFM_MAKEWORD(IFM_ETHER, IFM_HPNA_1, 0,
  425                                          sc->mii_inst),
  426                             MII_MEDIA_10_T);
  427                         PRINT("HomePNA1");
  428                 }
  429                 return;
  430         }
  431 
  432         if (sc->mii_capabilities & BMSR_10THDX) {
  433                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, 0, sc->mii_inst),
  434                     MII_MEDIA_10_T);
  435                 PRINT("10baseT");
  436         }
  437         if (sc->mii_capabilities & BMSR_10TFDX) {
  438                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, IFM_FDX, sc->mii_inst),
  439                     MII_MEDIA_10_T_FDX);
  440                 PRINT("10baseT-FDX");
  441         }
  442         if (sc->mii_capabilities & BMSR_100TXHDX) {
  443                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, 0, sc->mii_inst),
  444                     MII_MEDIA_100_TX);
  445                 PRINT("100baseTX");
  446         }
  447         if (sc->mii_capabilities & BMSR_100TXFDX) {
  448                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_FDX, sc->mii_inst),
  449                     MII_MEDIA_100_TX_FDX);
  450                 PRINT("100baseTX-FDX");
  451         }
  452         if (sc->mii_capabilities & BMSR_100T4) {
  453                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_T4, 0, sc->mii_inst),
  454                     MII_MEDIA_100_T4);
  455                 PRINT("100baseT4");
  456         }
  457 
  458         if (sc->mii_extcapabilities & EXTSR_MEDIAMASK) {
  459                 /*
  460                  * XXX Right now only handle 1000SX and 1000TX.  Need
  461                  * XXX to handle 1000LX and 1000CX some how.
  462                  */
  463                 if (sc->mii_extcapabilities & EXTSR_1000XHDX) {
  464                         sc->mii_anegticks = MII_ANEGTICKS_GIGE;
  465                         sc->mii_flags |= MIIF_IS_1000X;
  466                         ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX, 0,
  467                             sc->mii_inst), MII_MEDIA_1000_X);
  468                         PRINT("1000baseSX");
  469                 }
  470                 if (sc->mii_extcapabilities & EXTSR_1000XFDX) {
  471                         sc->mii_anegticks = MII_ANEGTICKS_GIGE;
  472                         sc->mii_flags |= MIIF_IS_1000X;
  473                         ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX, IFM_FDX,
  474                             sc->mii_inst), MII_MEDIA_1000_X_FDX);
  475                         PRINT("1000baseSX-FDX");
  476                 }
  477 
  478                 /*
  479                  * 1000baseT media needs to be able to manipulate
  480                  * master/slave mode.  We set IFM_ETH_MASTER in
  481                  * the "don't care mask" and filter it out when
  482                  * the media is set.
  483                  *
  484                  * All 1000baseT PHYs have a 1000baseT control register.
  485                  */
  486                 if (sc->mii_extcapabilities & EXTSR_1000THDX) {
  487                         sc->mii_anegticks = MII_ANEGTICKS_GIGE;
  488                         sc->mii_flags |= MIIF_HAVE_GTCR;
  489                         mii->mii_media.ifm_mask |= IFM_ETH_MASTER;
  490                         ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T, 0,
  491                             sc->mii_inst), MII_MEDIA_1000_T);
  492                         PRINT("1000baseT");
  493                 }
  494                 if (sc->mii_extcapabilities & EXTSR_1000TFDX) {
  495                         sc->mii_anegticks = MII_ANEGTICKS_GIGE;
  496                         sc->mii_flags |= MIIF_HAVE_GTCR;
  497                         mii->mii_media.ifm_mask |= IFM_ETH_MASTER;
  498                         ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T, IFM_FDX,
  499                             sc->mii_inst), MII_MEDIA_1000_T_FDX);
  500                         PRINT("1000baseT-FDX");
  501                 }
  502         }
  503 
  504         if (sc->mii_capabilities & BMSR_ANEG) {
  505                 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_AUTO, 0, sc->mii_inst),
  506                     MII_NMEDIA);        /* intentionally invalid index */
  507                 PRINT("auto");
  508         }
  509 #undef ADD
  510 #undef PRINT
  511 }
  512 
  513 int
  514 mii_phy_detach(device_t dev)
  515 {
  516         struct mii_softc *sc;
  517 
  518         sc = device_get_softc(dev);
  519         mii_phy_down(sc);
  520         sc->mii_dev = NULL;
  521         LIST_REMOVE(sc, mii_list);
  522 
  523         return(0);
  524 }
  525 
  526 const struct mii_phydesc *
  527 mii_phy_match_gen(const struct mii_attach_args *ma,
  528   const struct mii_phydesc *mpd, size_t len)
  529 {
  530 
  531         for (; mpd->mpd_name != NULL;
  532              mpd = (const struct mii_phydesc *) ((const char *) mpd + len)) {
  533                 if (MII_OUI(ma->mii_id1, ma->mii_id2) == mpd->mpd_oui &&
  534                     MII_MODEL(ma->mii_id2) == mpd->mpd_model)
  535                         return (mpd);
  536         }
  537         return (NULL);
  538 }
  539 
  540 const struct mii_phydesc *
  541 mii_phy_match(const struct mii_attach_args *ma, const struct mii_phydesc *mpd)
  542 {
  543 
  544         return (mii_phy_match_gen(ma, mpd, sizeof(struct mii_phydesc)));
  545 }
  546 
  547 int
  548 mii_phy_dev_probe(device_t dev, const struct mii_phydesc *mpd, int mrv)
  549 {
  550 
  551         mpd = mii_phy_match(device_get_ivars(dev), mpd);
  552         if (mpd != NULL) {
  553                 device_set_desc(dev, mpd->mpd_name);
  554                 return (mrv);
  555         }
  556 
  557         return (ENXIO);
  558 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mii/mii_physubr.c

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