rdcphy.c

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

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

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