nsphy.c

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    1 /*      $NetBSD: nsphy.c,v 1.18 1999/07/14 23:57:36 thorpej Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
    9  * NASA Ames Research Center.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   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 THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /*-
   34  * Copyright (c) 1997 Manuel Bouyer.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  *
   45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   46  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   47  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   48  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   49  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   51  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   52  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   53  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   54  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   55  */
   56 
   57 #include <sys/cdefs.h>
   58 __FBSDID("$FreeBSD$");
   59 
   60 /*
   61  * driver for National Semiconductor's DP83840A ethernet 10/100 PHY
   62  * Data Sheet available from www.national.com
   63  */
   64 
   65 #include <sys/param.h>
   66 #include <sys/systm.h>
   67 #include <sys/kernel.h>
   68 #include <sys/socket.h>
   69 #include <sys/errno.h>
   70 #include <sys/module.h>
   71 #include <sys/bus.h>
   72 
   73 #include <net/if.h>
   74 #include <net/if_media.h>
   75 
   76 #include <dev/mii/mii.h>
   77 #include <dev/mii/miivar.h>
   78 #include "miidevs.h"
   79 
   80 #include <dev/mii/nsphyreg.h>
   81 
   82 #include "miibus_if.h"
   83 
   84 static int nsphy_probe(device_t);
   85 static int nsphy_attach(device_t);
   86 
   87 static device_method_t nsphy_methods[] = {
   88         /* device interface */
   89         DEVMETHOD(device_probe,         nsphy_probe),
   90         DEVMETHOD(device_attach,        nsphy_attach),
   91         DEVMETHOD(device_detach,        mii_phy_detach),
   92         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   93         DEVMETHOD_END
   94 };
   95 
   96 static devclass_t nsphy_devclass;
   97 
   98 static driver_t nsphy_driver = {
   99         "nsphy",
  100         nsphy_methods,
  101         sizeof(struct mii_softc)
  102 };
  103 
  104 DRIVER_MODULE(nsphy, miibus, nsphy_driver, nsphy_devclass, 0, 0);
  105 
  106 static int      nsphy_service(struct mii_softc *, struct mii_data *, int);
  107 static void     nsphy_status(struct mii_softc *);
  108 static void     nsphy_reset(struct mii_softc *);
  109 
  110 static const struct mii_phydesc nsphys[] = {
  111         MII_PHY_DESC(xxNATSEMI, DP83840),
  112         MII_PHY_END
  113 };
  114 
  115 static const struct mii_phy_funcs nsphy_funcs = {
  116         nsphy_service,
  117         nsphy_status,
  118         nsphy_reset
  119 };
  120 
  121 static int
  122 nsphy_probe(device_t dev)
  123 {
  124 
  125         return (mii_phy_dev_probe(dev, nsphys, BUS_PROBE_DEFAULT));
  126 }
  127 
  128 static int
  129 nsphy_attach(device_t dev)
  130 {
  131         const char *nic;
  132         u_int flags;
  133 
  134         nic = device_get_name(device_get_parent(device_get_parent(dev)));
  135         flags = MIIF_NOMANPAUSE;
  136         /*
  137          * Am79C971 wedge when isolating all of their external PHYs.
  138          */
  139         if (strcmp(nic, "pcn") == 0)
  140                 flags |= MIIF_NOISOLATE;
  141         mii_phy_dev_attach(dev, flags, &nsphy_funcs, 1);
  142         return (0);
  143 }
  144 
  145 static int
  146 nsphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
  147 {
  148         int reg;
  149 
  150         switch (cmd) {
  151         case MII_POLLSTAT:
  152                 break;
  153 
  154         case MII_MEDIACHG:
  155                 /*
  156                  * If the interface is not up, don't do anything.
  157                  */
  158                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
  159                         break;
  160 
  161                 reg = PHY_READ(sc, MII_NSPHY_PCR);
  162 
  163                 /*
  164                  * Set up the PCR to use LED4 to indicate full-duplex
  165                  * in both 10baseT and 100baseTX modes.
  166                  */
  167                 reg |= PCR_LED4MODE;
  168 
  169                 /*
  170                  * Make sure Carrier Integrity Monitor function is
  171                  * disabled (normal for Node operation, but sometimes
  172                  * it's not set?!)
  173                  */
  174                 reg |= PCR_CIMDIS;
  175 
  176                 /*
  177                  * Make sure "force link good" is set to normal mode.
  178                  * It's only intended for debugging.
  179                  */
  180                 reg |= PCR_FLINK100;
  181 
  182                 /*
  183                  * Mystery bits which are supposedly `reserved',
  184                  * but we seem to need to set them when the PHY
  185                  * is connected to some interfaces:
  186                  *
  187                  * 0x0400 is needed for fxp
  188                  *        (Intel EtherExpress Pro 10+/100B, 82557 chip)
  189                  *        (nsphy with a DP83840 chip)
  190                  * 0x0100 may be needed for some other card
  191                  */
  192                 reg |= 0x0100 | 0x0400;
  193 
  194                 if (strcmp(mii->mii_ifp->if_dname, "fxp") == 0)
  195                         PHY_WRITE(sc, MII_NSPHY_PCR, reg);
  196 
  197                 mii_phy_setmedia(sc);
  198                 break;
  199 
  200         case MII_TICK:
  201                 if (mii_phy_tick(sc) == EJUSTRETURN)
  202                         return (0);
  203                 break;
  204         }
  205 
  206         /* Update the media status. */
  207         PHY_STATUS(sc);
  208 
  209         /* Callback if something changed. */
  210         mii_phy_update(sc, cmd);
  211         return (0);
  212 }
  213 
  214 static void
  215 nsphy_status(struct mii_softc *sc)
  216 {
  217         struct mii_data *mii = sc->mii_pdata;
  218         struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
  219         int bmsr, bmcr, par, anlpar;
  220 
  221         mii->mii_media_status = IFM_AVALID;
  222         mii->mii_media_active = IFM_ETHER;
  223 
  224         bmsr = PHY_READ(sc, MII_BMSR) |
  225             PHY_READ(sc, MII_BMSR);
  226         if (bmsr & BMSR_LINK)
  227                 mii->mii_media_status |= IFM_ACTIVE;
  228 
  229         bmcr = PHY_READ(sc, MII_BMCR);
  230         if (bmcr & BMCR_ISO) {
  231                 mii->mii_media_active |= IFM_NONE;
  232                 mii->mii_media_status = 0;
  233                 return;
  234         }
  235 
  236         if (bmcr & BMCR_LOOP)
  237                 mii->mii_media_active |= IFM_LOOP;
  238 
  239         if (bmcr & BMCR_AUTOEN) {
  240                 /*
  241                  * The PAR status bits are only valid if autonegotiation
  242                  * has completed (or it's disabled).
  243                  */
  244                 if ((bmsr & BMSR_ACOMP) == 0) {
  245                         /* Erg, still trying, I guess... */
  246                         mii->mii_media_active |= IFM_NONE;
  247                         return;
  248                 }
  249 
  250                 /*
  251                  * Argh.  The PAR doesn't seem to indicate duplex mode
  252                  * properly!  Determine media based on link partner's
  253                  * advertised capabilities.
  254                  */
  255                 if (PHY_READ(sc, MII_ANER) & ANER_LPAN) {
  256                         anlpar = PHY_READ(sc, MII_ANAR) &
  257                             PHY_READ(sc, MII_ANLPAR);
  258                         if (anlpar & ANLPAR_TX_FD)
  259                                 mii->mii_media_active |= IFM_100_TX|IFM_FDX;
  260                         else if (anlpar & ANLPAR_T4)
  261                                 mii->mii_media_active |= IFM_100_T4|IFM_HDX;
  262                         else if (anlpar & ANLPAR_TX)
  263                                 mii->mii_media_active |= IFM_100_TX|IFM_HDX;
  264                         else if (anlpar & ANLPAR_10_FD)
  265                                 mii->mii_media_active |= IFM_10_T|IFM_FDX;
  266                         else if (anlpar & ANLPAR_10)
  267                                 mii->mii_media_active |= IFM_10_T|IFM_HDX;
  268                         else
  269                                 mii->mii_media_active |= IFM_NONE;
  270                         if ((mii->mii_media_active & IFM_FDX) != 0)
  271                                 mii->mii_media_active |=
  272                                     mii_phy_flowstatus(sc);
  273                         return;
  274                 }
  275 
  276                 /*
  277                  * Link partner is not capable of autonegotiation.
  278                  * We will never be in full-duplex mode if this is
  279                  * the case, so reading the PAR is OK.
  280                  */
  281                 par = PHY_READ(sc, MII_NSPHY_PAR);
  282                 if (par & PAR_10)
  283                         mii->mii_media_active |= IFM_10_T;
  284                 else
  285                         mii->mii_media_active |= IFM_100_TX;
  286                 mii->mii_media_active |= IFM_HDX;
  287         } else
  288                 mii->mii_media_active = ife->ifm_media;
  289 }
  290 
  291 static void
  292 nsphy_reset(struct mii_softc *sc)
  293 {
  294         struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
  295         int reg, i;
  296 
  297         if (sc->mii_flags & MIIF_NOISOLATE)
  298                 reg = BMCR_RESET;
  299         else
  300                 reg = BMCR_RESET | BMCR_ISO;
  301         PHY_WRITE(sc, MII_BMCR, reg);
  302 
  303         /*
  304          * It is best to allow a little time for the reset to settle
  305          * in before we start polling the BMCR again.  Notably, the
  306          * DP83840A manuals state that there should be a 500us delay
  307          * between asserting software reset and attempting MII serial
  308          * operations.  Be conservative.
  309          */
  310         DELAY(1000);
  311 
  312         /*
  313          * Wait another 2s for it to complete.
  314          * This is only a little overkill as under normal circumstances
  315          * the PHY can take up to 1s to complete reset.
  316          * This is also a bit odd because after a reset, the BMCR will
  317          * clear the reset bit and simply reports 0 even though the reset
  318          * is not yet complete.
  319          */
  320         for (i = 0; i < 1000; i++) {
  321                 reg = PHY_READ(sc, MII_BMCR);
  322                 if (reg != 0 && (reg & BMCR_RESET) == 0)
  323                         break;
  324                 DELAY(2000);
  325         }
  326 
  327         if ((sc->mii_flags & MIIF_NOISOLATE) == 0) {
  328                 if ((ife == NULL && sc->mii_inst != 0) ||
  329                     (ife != NULL && IFM_INST(ife->ifm_media) != sc->mii_inst))
  330                         PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
  331         }
  332 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mii/nsphy.c

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