mlphy.c

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    1 /*-
    2  * Copyright (c) 1997, 1998, 1999
    3  *      Bill Paul <wpaul@ctr.columbia.edu>.  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, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by Bill Paul.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 /*
   38  * driver for Micro Linear 6692 PHYs
   39  *
   40  * The Micro Linear 6692 is a strange beast, and dealing with it using
   41  * this code framework is tricky. The 6692 is actually a 100Mbps-only
   42  * device, which means that a second PHY is required to support 10Mbps
   43  * modes. However, even though the 6692 does not support 10Mbps modes,
   44  * it can still advertise them when performing autonegotiation. If a
   45  * 10Mbps mode is negotiated, we must program the registers of the
   46  * companion PHY accordingly in addition to programming the registers
   47  * of the 6692.
   48  *
   49  * This device also does not have vendor/device ID registers.
   50  */
   51 
   52 #include <sys/param.h>
   53 #include <sys/systm.h>
   54 #include <sys/kernel.h>
   55 #include <sys/socket.h>
   56 #include <sys/module.h>
   57 #include <sys/bus.h>
   58 #include <sys/malloc.h>
   59 
   60 #include <net/if.h>
   61 #include <net/if_media.h>
   62 
   63 #include <dev/mii/mii.h>
   64 #include <dev/mii/miivar.h>
   65 
   66 #include "miibus_if.h"
   67 
   68 #define ML_STATE_AUTO_SELF      1
   69 #define ML_STATE_AUTO_OTHER     2
   70 
   71 struct mlphy_softc      {
   72         struct mii_softc        ml_mii;
   73         device_t                ml_dev;
   74         int                     ml_state;
   75         int                     ml_linked;
   76 };
   77 
   78 static int mlphy_probe(device_t);
   79 static int mlphy_attach(device_t);
   80 
   81 static device_method_t mlphy_methods[] = {
   82         /* device interface */
   83         DEVMETHOD(device_probe,         mlphy_probe),
   84         DEVMETHOD(device_attach,        mlphy_attach),
   85         DEVMETHOD(device_detach,        mii_phy_detach),
   86         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   87         DEVMETHOD_END
   88 };
   89 
   90 static devclass_t mlphy_devclass;
   91 
   92 static driver_t mlphy_driver = {
   93         "mlphy",
   94         mlphy_methods,
   95         sizeof(struct mlphy_softc)
   96 };
   97 
   98 DRIVER_MODULE(mlphy, miibus, mlphy_driver, mlphy_devclass, 0, 0);
   99 
  100 static struct mii_softc *mlphy_find_other(struct mlphy_softc *);
  101 static int      mlphy_service(struct mii_softc *, struct mii_data *, int);
  102 static void     mlphy_reset(struct mii_softc *);
  103 static void     mlphy_status(struct mii_softc *);
  104 
  105 static const struct mii_phy_funcs mlphy_funcs = {
  106         mlphy_service,
  107         mlphy_status,
  108         mlphy_reset
  109 };
  110 
  111 static int
  112 mlphy_probe(dev)
  113         device_t                dev;
  114 {
  115         struct mii_attach_args  *ma;
  116 
  117         ma = device_get_ivars(dev);
  118 
  119         /*
  120          * Micro Linear PHY reports oui == 0 model == 0
  121          */
  122         if (MII_OUI(ma->mii_id1, ma->mii_id2) != 0 ||
  123             MII_MODEL(ma->mii_id2) != 0)
  124                 return (ENXIO);
  125 
  126         /*
  127          * Make sure the parent is a `tl'. So far, I have only
  128          * encountered the 6692 on an Olicom card with a ThunderLAN
  129          * controller chip.
  130          */
  131         if (strcmp(device_get_name(device_get_parent(device_get_parent(dev))),
  132             "tl") != 0)
  133                 return (ENXIO);
  134 
  135         device_set_desc(dev, "Micro Linear 6692 media interface");
  136 
  137         return (BUS_PROBE_DEFAULT);
  138 }
  139 
  140 static int
  141 mlphy_attach(dev)
  142         device_t                dev;
  143 {
  144         struct mlphy_softc *msc;
  145         struct mii_softc *sc;
  146 
  147         msc = device_get_softc(dev);
  148         sc = &msc->ml_mii;
  149         msc->ml_dev = dev;
  150         mii_phy_dev_attach(dev, MIIF_NOMANPAUSE, &mlphy_funcs, 0);
  151 
  152         PHY_RESET(sc);
  153 
  154         sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & sc->mii_capmask;
  155         /* Let the companion PHY (if any) only handle the media we don't. */
  156         sc->mii_capmask = ~sc->mii_capabilities;
  157         device_printf(dev, " ");
  158         mii_phy_add_media(sc);
  159         printf("\n");
  160 
  161         MIIBUS_MEDIAINIT(sc->mii_dev);
  162         return (0);
  163 }
  164 
  165 static struct mii_softc *
  166 mlphy_find_other(struct mlphy_softc *msc)
  167 {
  168         device_t                *devlist;
  169         struct mii_softc *retval;
  170         int i, devs;
  171 
  172         retval = NULL;
  173         if (device_get_children(msc->ml_mii.mii_dev, &devlist, &devs) != 0)
  174                 return (NULL);
  175         for (i = 0; i < devs; i++) {
  176                 if (devlist[i] != msc->ml_dev) {
  177                         retval = device_get_softc(devlist[i]);
  178                         break;
  179                 }
  180         }
  181         free(devlist, M_TEMP);
  182         return (retval);
  183 }
  184 
  185 static int
  186 mlphy_service(xsc, mii, cmd)
  187         struct mii_softc *xsc;
  188         struct mii_data *mii;
  189         int cmd;
  190 {
  191         struct ifmedia_entry    *ife = mii->mii_media.ifm_cur;
  192         struct mii_softc        *other = NULL;
  193         struct mlphy_softc      *msc = (struct mlphy_softc *)xsc;
  194         struct mii_softc        *sc = (struct mii_softc *)&msc->ml_mii;
  195         int                     other_inst, reg;
  196 
  197         /*
  198          * See if there's another PHY on this bus with us.
  199          * If so, we may need it for 10Mbps modes.
  200          */
  201         other = mlphy_find_other(msc);
  202 
  203         switch (cmd) {
  204         case MII_POLLSTAT:
  205                 break;
  206 
  207         case MII_MEDIACHG:
  208                 /*
  209                  * If the interface is not up, don't do anything.
  210                  */
  211                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
  212                         break;
  213 
  214                 switch (IFM_SUBTYPE(ife->ifm_media)) {
  215                 case IFM_AUTO:
  216                         /*
  217                          * For autonegotiation, reset and isolate the
  218                          * companion PHY (if any) and then do NWAY
  219                          * autonegotiation ourselves.
  220                          */
  221                         msc->ml_state = ML_STATE_AUTO_SELF;
  222                         if (other != NULL) {
  223                                 PHY_RESET(other);
  224                                 PHY_WRITE(other, MII_BMCR, BMCR_ISO);
  225                         }
  226                         (void)mii_phy_auto(sc);
  227                         msc->ml_linked = 0;
  228                         return (0);
  229                 case IFM_10_T:
  230                         /*
  231                          * For 10baseT modes, reset and program the
  232                          * companion PHY (of any), then program ourselves
  233                          * to match. This will put us in pass-through
  234                          * mode and let the companion PHY do all the
  235                          * work.
  236                          *
  237                          * BMCR data is stored in the ifmedia entry.
  238                          */
  239                         if (other != NULL) {
  240                                 PHY_RESET(other);
  241                                 PHY_WRITE(other, MII_BMCR, ife->ifm_data);
  242                         }
  243                         mii_phy_setmedia(sc);
  244                         msc->ml_state = 0;
  245                         break;
  246                 case IFM_100_TX:
  247                         /*
  248                          * For 100baseTX modes, reset and isolate the
  249                          * companion PHY (if any), then program ourselves
  250                          * accordingly.
  251                          *
  252                          * BMCR data is stored in the ifmedia entry.
  253                          */
  254                         if (other != NULL) {
  255                                 PHY_RESET(other);
  256                                 PHY_WRITE(other, MII_BMCR, BMCR_ISO);
  257                         }
  258                         mii_phy_setmedia(sc);
  259                         msc->ml_state = 0;
  260                         break;
  261                 default:
  262                         return (EINVAL);
  263 
  264                 }
  265                 break;
  266 
  267         case MII_TICK:
  268                 /*
  269                  * Is the interface even up?
  270                  */
  271                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
  272                         return (0);
  273 
  274                 /*
  275                  * Only used for autonegotiation.
  276                  */
  277                 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
  278                         break;
  279 
  280                 /*
  281                  * Check to see if we have link.  If we do, we don't
  282                  * need to restart the autonegotiation process.  Read
  283                  * the BMSR twice in case it's latched.
  284                  * If we're in a 10Mbps mode, check the link of the
  285                  * 10Mbps PHY. Sometimes the Micro Linear PHY's
  286                  * linkstat bit will clear while the linkstat bit of
  287                  * the companion PHY will remain set.
  288                  */
  289                 if (msc->ml_state == ML_STATE_AUTO_OTHER) {
  290                         reg = PHY_READ(other, MII_BMSR) |
  291                             PHY_READ(other, MII_BMSR);
  292                 } else {
  293                         reg = PHY_READ(sc, MII_BMSR) |
  294                             PHY_READ(sc, MII_BMSR);
  295                 }
  296 
  297                 if (reg & BMSR_LINK) {
  298                         if (!msc->ml_linked) {
  299                                 msc->ml_linked = 1;
  300                                 PHY_STATUS(sc);
  301                         }
  302                         break;
  303                 }
  304 
  305                 /*
  306                  * Only retry autonegotiation every 5 seconds.
  307                  */
  308                 if (++sc->mii_ticks <= MII_ANEGTICKS)
  309                         break;
  310 
  311                 sc->mii_ticks = 0;
  312                 msc->ml_linked = 0;
  313                 mii->mii_media_active = IFM_NONE;
  314                 PHY_RESET(sc);
  315                 msc->ml_state = ML_STATE_AUTO_SELF;
  316                 if (other != NULL) {
  317                         PHY_RESET(other);
  318                         PHY_WRITE(other, MII_BMCR, BMCR_ISO);
  319                 }
  320                 mii_phy_auto(sc);
  321                 return (0);
  322         }
  323 
  324         /* Update the media status. */
  325 
  326         if (msc->ml_state == ML_STATE_AUTO_OTHER) {
  327                 other_inst = other->mii_inst;
  328                 other->mii_inst = sc->mii_inst;
  329                 if (IFM_INST(ife->ifm_media) == other->mii_inst)
  330                         (void)PHY_SERVICE(other, mii, MII_POLLSTAT);
  331                 other->mii_inst = other_inst;
  332                 sc->mii_media_active = other->mii_media_active;
  333                 sc->mii_media_status = other->mii_media_status;
  334         } else
  335                 ukphy_status(sc);
  336 
  337         /* Callback if something changed. */
  338         mii_phy_update(sc, cmd);
  339         return (0);
  340 }
  341 
  342 /*
  343  * The Micro Linear PHY comes out of reset with the 'autoneg
  344  * enable' bit set, which we don't want.
  345  */
  346 static void
  347 mlphy_reset(sc)
  348         struct mii_softc        *sc;
  349 {
  350         int                     reg;
  351 
  352         mii_phy_reset(sc);
  353         reg = PHY_READ(sc, MII_BMCR);
  354         reg &= ~BMCR_AUTOEN;
  355         PHY_WRITE(sc, MII_BMCR, reg);
  356 }
  357 
  358 /*
  359  * If we negotiate a 10Mbps mode, we need to check for an alternate
  360  * PHY and make sure it's enabled and set correctly.
  361  */
  362 static void
  363 mlphy_status(sc)
  364         struct mii_softc        *sc;
  365 {
  366         struct mlphy_softc      *msc = (struct mlphy_softc *)sc;
  367         struct mii_data         *mii = msc->ml_mii.mii_pdata;
  368         struct mii_softc        *other = NULL;
  369 
  370         /* See if there's another PHY on the bus with us. */
  371         other = mlphy_find_other(msc);
  372         if (other == NULL)
  373                 return;
  374 
  375         ukphy_status(sc);
  376 
  377         if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) {
  378                 msc->ml_state = ML_STATE_AUTO_SELF;
  379                 PHY_RESET(other);
  380                 PHY_WRITE(other, MII_BMCR, BMCR_ISO);
  381         }
  382 
  383         if (IFM_SUBTYPE(mii->mii_media_active) == IFM_10_T) {
  384                 msc->ml_state = ML_STATE_AUTO_OTHER;
  385                 PHY_RESET(&msc->ml_mii);
  386                 PHY_WRITE(&msc->ml_mii, MII_BMCR, BMCR_ISO);
  387                 PHY_RESET(other);
  388                 mii_phy_auto(other);
  389         }
  390 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mii/mlphy.c

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