smscphy.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 Benno Rice.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 /*
   31  * Driver for the SMSC LAN8710A
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/socket.h>
   38 #include <sys/errno.h>
   39 #include <sys/module.h>
   40 #include <sys/bus.h>
   41 #include <sys/malloc.h>
   42 
   43 #include <machine/bus.h>
   44 
   45 #include <net/if.h>
   46 #include <net/if_media.h>
   47 
   48 #include <dev/mii/mii.h>
   49 #include <dev/mii/miivar.h>
   50 #include "miidevs.h"
   51 
   52 #include "miibus_if.h"
   53 
   54 static int      smscphy_probe(device_t);
   55 static int      smscphy_attach(device_t);
   56 
   57 static int      smscphy_service(struct mii_softc *, struct mii_data *, int);
   58 static void     smscphy_auto(struct mii_softc *, int);
   59 static void     smscphy_status(struct mii_softc *);
   60 
   61 static device_method_t smscphy_methods[] = {
   62         /* device interface */
   63         DEVMETHOD(device_probe,         smscphy_probe),
   64         DEVMETHOD(device_attach,        smscphy_attach),
   65         DEVMETHOD(device_detach,        mii_phy_detach),
   66         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   67         DEVMETHOD_END
   68 };
   69 
   70 static driver_t smscphy_driver = {
   71         "smscphy",
   72         smscphy_methods,
   73         sizeof(struct mii_softc)
   74 };
   75 
   76 DRIVER_MODULE(smscphy, miibus, smscphy_driver, 0, 0);
   77 
   78 static const struct mii_phydesc smscphys[] = {
   79         MII_PHY_DESC(SMC, LAN8710A),
   80         MII_PHY_DESC(SMC, LAN8700),
   81         MII_PHY_END
   82 };
   83 
   84 static const struct mii_phy_funcs smscphy_funcs = {
   85         smscphy_service,
   86         smscphy_status,
   87         mii_phy_reset
   88 };
   89 
   90 static int
   91 smscphy_probe(device_t dev)
   92 {
   93 
   94         return (mii_phy_dev_probe(dev, smscphys, BUS_PROBE_DEFAULT));
   95 }
   96 
   97 static int
   98 smscphy_attach(device_t dev)
   99 {
  100         struct mii_softc *sc;
  101         const struct mii_phy_funcs *mpf;
  102 
  103         sc = device_get_softc(dev);
  104         mpf = &smscphy_funcs;
  105         mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE, mpf, 1);
  106         mii_phy_setmedia(sc);
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 smscphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
  113 {
  114         struct  ifmedia_entry *ife;
  115         int     reg;
  116 
  117         ife = mii->mii_media.ifm_cur;
  118 
  119         switch (cmd) {
  120         case MII_POLLSTAT:
  121                 break;
  122 
  123         case MII_MEDIACHG:
  124                 switch (IFM_SUBTYPE(ife->ifm_media)) {
  125                 case IFM_AUTO:
  126                         smscphy_auto(sc, ife->ifm_media);
  127                         break;
  128 
  129                 default:
  130                         mii_phy_setmedia(sc);
  131                         break;
  132                 }
  133 
  134                 break;
  135 
  136         case MII_TICK:
  137                 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
  138                         break;
  139                 }
  140 
  141                 /* I have no idea why BMCR_ISO gets set. */
  142                 reg = PHY_READ(sc, MII_BMCR);
  143                 if (reg & BMCR_ISO) {
  144                         PHY_WRITE(sc, MII_BMCR, reg & ~BMCR_ISO);
  145                 }
  146 
  147                 reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
  148                 if (reg & BMSR_LINK) {
  149                         sc->mii_ticks = 0;
  150                         break;
  151                 }
  152 
  153                 if (++sc->mii_ticks <= MII_ANEGTICKS) {
  154                         break;
  155                 }
  156 
  157                 sc->mii_ticks = 0;
  158                 PHY_RESET(sc);
  159                 smscphy_auto(sc, ife->ifm_media);
  160                 break;
  161         }
  162 
  163         /* Update the media status. */
  164         PHY_STATUS(sc);
  165 
  166         /* Callback if something changed. */
  167         mii_phy_update(sc, cmd);
  168         return (0);
  169 }
  170 
  171 static void
  172 smscphy_auto(struct mii_softc *sc, int media)
  173 {
  174         uint16_t        anar;
  175 
  176         anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) | ANAR_CSMA;
  177         if ((media & IFM_FLOW) != 0 || (sc->mii_flags & MIIF_FORCEPAUSE) != 0)
  178                 anar |= ANAR_FC;
  179         PHY_WRITE(sc, MII_ANAR, anar);
  180         /* Apparently this helps. */
  181         anar = PHY_READ(sc, MII_ANAR);
  182         PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
  183 }
  184 
  185 static void
  186 smscphy_status(struct mii_softc *sc)
  187 {
  188         struct mii_data *mii;
  189         uint32_t bmcr, bmsr, status;
  190 
  191         mii = sc->mii_pdata;
  192         mii->mii_media_status = IFM_AVALID;
  193         mii->mii_media_active = IFM_ETHER;
  194 
  195         bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
  196         if ((bmsr & BMSR_LINK) != 0)
  197                 mii->mii_media_status |= IFM_ACTIVE;
  198 
  199         bmcr = PHY_READ(sc, MII_BMCR);
  200         if ((bmcr & BMCR_ISO) != 0) {
  201                 mii->mii_media_active |= IFM_NONE;
  202                 mii->mii_media_status = 0;
  203                 return;
  204         }
  205 
  206         if ((bmcr & BMCR_LOOP) != 0)
  207                 mii->mii_media_active |= IFM_LOOP;
  208 
  209         if ((bmcr & BMCR_AUTOEN) != 0) {
  210                 if ((bmsr & BMSR_ACOMP) == 0) {
  211                         /* Erg, still trying, I guess... */
  212                         mii->mii_media_active |= IFM_NONE;
  213                         return;
  214                 }
  215         }
  216 
  217         status = PHY_READ(sc, 0x1F);
  218         if (status & 0x0008)
  219                 mii->mii_media_active |= IFM_100_TX;
  220         else
  221                 mii->mii_media_active |= IFM_10_T;
  222         if (status & 0x0010)
  223                 mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
  224         else
  225                 mii->mii_media_active |= IFM_HDX;
  226 }

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

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