rdcphy.c

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    1 /*-
    2  * Copyright (c) 2010, Pyun YongHyeon <yongari@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    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 AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 /*
   32  * Driver for the RDC Semiconductor R6040 10/100 PHY.
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/socket.h>
   40 #include <sys/bus.h>
   41 
   42 #include <net/if.h>
   43 #include <net/if_media.h>
   44 
   45 #include <dev/mii/mii.h>
   46 #include <dev/mii/miivar.h>
   47 #include "miidevs.h"
   48 
   49 #include <dev/mii/rdcphyreg.h>
   50 
   51 #include "miibus_if.h"
   52 
   53 static device_probe_t   rdcphy_probe;
   54 static device_attach_t  rdcphy_attach;
   55 
   56 struct rdcphy_softc {
   57         struct mii_softc mii_sc;
   58         int mii_link_tick;
   59 #define RDCPHY_MANNEG_TICK      3
   60 };
   61 
   62 static device_method_t rdcphy_methods[] = {
   63         /* device interface */
   64         DEVMETHOD(device_probe,         rdcphy_probe),
   65         DEVMETHOD(device_attach,        rdcphy_attach),
   66         DEVMETHOD(device_detach,        mii_phy_detach),
   67         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   68         DEVMETHOD_END
   69 };
   70 
   71 static devclass_t rdcphy_devclass;
   72 
   73 static driver_t rdcphy_driver = {
   74         "rdcphy",
   75         rdcphy_methods,
   76         sizeof(struct rdcphy_softc)
   77 };
   78 
   79 DRIVER_MODULE(rdcphy, miibus, rdcphy_driver, rdcphy_devclass, 0, 0);
   80 
   81 static int      rdcphy_service(struct mii_softc *, struct mii_data *, int);
   82 static void     rdcphy_status(struct mii_softc *);
   83 
   84 static const struct mii_phydesc rdcphys[] = {
   85         MII_PHY_DESC(RDC, R6040),
   86         MII_PHY_END
   87 };
   88 
   89 static const struct mii_phy_funcs rdcphy_funcs = {
   90         rdcphy_service,
   91         rdcphy_status,
   92         mii_phy_reset
   93 };
   94 
   95 static int
   96 rdcphy_probe(device_t dev)
   97 {
   98 
   99         return (mii_phy_dev_probe(dev, rdcphys, BUS_PROBE_DEFAULT));
  100 }
  101 
  102 static int
  103 rdcphy_attach(device_t dev)
  104 {
  105 
  106         mii_phy_dev_attach(dev, MIIF_NOMANPAUSE, &rdcphy_funcs, 1);
  107         return (0);
  108 }
  109 
  110 static int
  111 rdcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
  112 {
  113         struct rdcphy_softc *rsc;
  114         struct ifmedia_entry *ife;
  115 
  116         rsc = (struct rdcphy_softc *)sc;
  117         ife = mii->mii_media.ifm_cur;
  118 
  119         switch (cmd) {
  120         case MII_POLLSTAT:
  121                 break;
  122 
  123         case MII_MEDIACHG:
  124                 /*
  125                  * If the interface is not up, don't do anything.
  126                  */
  127                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
  128                         break;
  129 
  130                 mii_phy_setmedia(sc);
  131                 switch (IFM_SUBTYPE(ife->ifm_media)) {
  132                 case IFM_100_TX:
  133                 case IFM_10_T:
  134                         /*
  135                          * Report fake lost link event to parent
  136                          * driver.  This will stop MAC of parent
  137                          * driver and make it possible to reconfigure
  138                          * MAC after completion of link establishment.
  139                          * Note, the parent MAC seems to require
  140                          * restarting MAC when underlying any PHY
  141                          * configuration was changed even if the
  142                          * resolved speed/duplex was not changed at
  143                          * all.
  144                          */
  145                         mii->mii_media_status = 0;
  146                         mii->mii_media_active = IFM_ETHER | IFM_NONE;
  147                         rsc->mii_link_tick = RDCPHY_MANNEG_TICK;
  148                         /* Immediately report link down. */
  149                         mii_phy_update(sc, MII_MEDIACHG);
  150                         return (0);
  151                 default:
  152                         break;
  153                 }
  154                 break;
  155 
  156         case MII_TICK:
  157                 if (mii_phy_tick(sc) == EJUSTRETURN)
  158                         return (0);
  159                 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
  160                         /*
  161                          * It seems the PHY hardware does not correctly
  162                          * report link status changes when manual link
  163                          * configuration is in progress.  It is also
  164                          * possible for the PHY to complete establishing
  165                          * a link within one second such that mii(4)
  166                          * did not notice the link change.  To workaround
  167                          * the issue, emulate lost link event and wait
  168                          * for 3 seconds when manual link configuration
  169                          * is in progress.  3 seconds would be long
  170                          * enough to absorb transient link flips.
  171                          */
  172                         if (rsc->mii_link_tick > 0) {
  173                                 rsc->mii_link_tick--;
  174                                 return (0);
  175                         }
  176                 }
  177                 break;
  178         }
  179 
  180         /* Update the media status. */
  181         PHY_STATUS(sc);
  182 
  183         /* Callback if something changed. */
  184         mii_phy_update(sc, cmd);
  185         return (0);
  186 }
  187 
  188 static void
  189 rdcphy_status(struct mii_softc *sc)
  190 {
  191         struct mii_data *mii;
  192         struct ifmedia_entry *ife;
  193         int bmsr, bmcr, physts;
  194 
  195         mii = sc->mii_pdata;
  196         ife = mii->mii_media.ifm_cur;
  197 
  198         mii->mii_media_status = IFM_AVALID;
  199         mii->mii_media_active = IFM_ETHER;
  200 
  201         bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
  202         physts = PHY_READ(sc, MII_RDCPHY_STATUS);
  203 
  204         if ((physts & STATUS_LINK_UP) != 0)
  205                 mii->mii_media_status |= IFM_ACTIVE;
  206 
  207         bmcr = PHY_READ(sc, MII_BMCR);
  208         if ((bmcr & BMCR_ISO) != 0) {
  209                 mii->mii_media_active |= IFM_NONE;
  210                 mii->mii_media_status = 0;
  211                 return;
  212         }
  213 
  214         if ((bmcr & BMCR_LOOP) != 0)
  215                 mii->mii_media_active |= IFM_LOOP;
  216 
  217         if ((bmcr & BMCR_AUTOEN) != 0) {
  218                 if ((bmsr & BMSR_ACOMP) == 0) {
  219                         /* Erg, still trying, I guess... */
  220                         mii->mii_media_active |= IFM_NONE;
  221                         return;
  222                 }
  223         }
  224 
  225         switch (physts & STATUS_SPEED_MASK) {
  226         case STATUS_SPEED_100:
  227                 mii->mii_media_active |= IFM_100_TX;
  228                 break;
  229         case STATUS_SPEED_10:
  230                 mii->mii_media_active |= IFM_10_T;
  231                 break;
  232         default:
  233                 mii->mii_media_active |= IFM_NONE;
  234                 return;
  235         }
  236         if ((physts & STATUS_FULL_DUPLEX) != 0)
  237                 mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
  238         else
  239                 mii->mii_media_active |= IFM_HDX;
  240 }

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

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