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 devclass_t smscphy_devclass;
   71 
   72 static driver_t smscphy_driver = {
   73         "smscphy",
   74         smscphy_methods,
   75         sizeof(struct mii_softc)
   76 };
   77 
   78 DRIVER_MODULE(smscphy, miibus, smscphy_driver, smscphy_devclass, 0, 0);
   79 
   80 static const struct mii_phydesc smscphys[] = {
   81         MII_PHY_DESC(SMC, LAN8710A),
   82         MII_PHY_DESC(SMC, LAN8700),
   83         MII_PHY_END
   84 };
   85 
   86 static const struct mii_phy_funcs smscphy_funcs = {
   87         smscphy_service,
   88         smscphy_status,
   89         mii_phy_reset
   90 };
   91 
   92 static int
   93 smscphy_probe(device_t dev)
   94 {
   95 
   96         return (mii_phy_dev_probe(dev, smscphys, BUS_PROBE_DEFAULT));
   97 }
   98 
   99 static int
  100 smscphy_attach(device_t dev)
  101 {
  102         struct mii_softc *sc;
  103         const struct mii_phy_funcs *mpf;
  104 
  105         sc = device_get_softc(dev);
  106         mpf = &smscphy_funcs;
  107         mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE, mpf, 1);
  108         mii_phy_setmedia(sc);
  109 
  110         return (0);
  111 }
  112 
  113 static int
  114 smscphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
  115 {
  116         struct  ifmedia_entry *ife;
  117         int     reg;
  118 
  119         ife = mii->mii_media.ifm_cur;
  120 
  121         switch (cmd) {
  122         case MII_POLLSTAT:
  123                 break;
  124 
  125         case MII_MEDIACHG:
  126                 switch (IFM_SUBTYPE(ife->ifm_media)) {
  127                 case IFM_AUTO:
  128                         smscphy_auto(sc, ife->ifm_media);
  129                         break;
  130 
  131                 default:
  132                         mii_phy_setmedia(sc);
  133                         break;
  134                 }
  135 
  136                 break;
  137 
  138         case MII_TICK:
  139                 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
  140                         break;
  141                 }
  142 
  143                 /* I have no idea why BMCR_ISO gets set. */
  144                 reg = PHY_READ(sc, MII_BMCR);
  145                 if (reg & BMCR_ISO) {
  146                         PHY_WRITE(sc, MII_BMCR, reg & ~BMCR_ISO);
  147                 }
  148 
  149                 reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
  150                 if (reg & BMSR_LINK) {
  151                         sc->mii_ticks = 0;
  152                         break;
  153                 }
  154 
  155                 if (++sc->mii_ticks <= MII_ANEGTICKS) {
  156                         break;
  157                 }
  158 
  159                 sc->mii_ticks = 0;
  160                 PHY_RESET(sc);
  161                 smscphy_auto(sc, ife->ifm_media);
  162                 break;
  163         }
  164 
  165         /* Update the media status. */
  166         PHY_STATUS(sc);
  167 
  168         /* Callback if something changed. */
  169         mii_phy_update(sc, cmd);
  170         return (0);
  171 }
  172 
  173 static void
  174 smscphy_auto(struct mii_softc *sc, int media)
  175 {
  176         uint16_t        anar;
  177 
  178         anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) | ANAR_CSMA;
  179         if ((media & IFM_FLOW) != 0 || (sc->mii_flags & MIIF_FORCEPAUSE) != 0)
  180                 anar |= ANAR_FC;
  181         PHY_WRITE(sc, MII_ANAR, anar);
  182         /* Apparently this helps. */
  183         anar = PHY_READ(sc, MII_ANAR);
  184         PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
  185 }
  186 
  187 static void
  188 smscphy_status(struct mii_softc *sc)
  189 {
  190         struct mii_data *mii;
  191         uint32_t bmcr, bmsr, status;
  192 
  193         mii = sc->mii_pdata;
  194         mii->mii_media_status = IFM_AVALID;
  195         mii->mii_media_active = IFM_ETHER;
  196 
  197         bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
  198         if ((bmsr & BMSR_LINK) != 0)
  199                 mii->mii_media_status |= IFM_ACTIVE;
  200 
  201         bmcr = PHY_READ(sc, MII_BMCR);
  202         if ((bmcr & BMCR_ISO) != 0) {
  203                 mii->mii_media_active |= IFM_NONE;
  204                 mii->mii_media_status = 0;
  205                 return;
  206         }
  207 
  208         if ((bmcr & BMCR_LOOP) != 0)
  209                 mii->mii_media_active |= IFM_LOOP;
  210 
  211         if ((bmcr & BMCR_AUTOEN) != 0) {
  212                 if ((bmsr & BMSR_ACOMP) == 0) {
  213                         /* Erg, still trying, I guess... */
  214                         mii->mii_media_active |= IFM_NONE;
  215                         return;
  216                 }
  217         }
  218 
  219         status = PHY_READ(sc, 0x1F);
  220         if (status & 0x0008)
  221                 mii->mii_media_active |= IFM_100_TX;
  222         else
  223                 mii->mii_media_active |= IFM_10_T;
  224         if (status & 0x0010)
  225                 mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
  226         else
  227                 mii->mii_media_active |= IFM_HDX;
  228 }

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

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