sys/dev/mii/amhphy.c

   1 /*      $NetBSD: amhphy.c,v 1.18 2008/05/04 17:06:09 xtraeme Exp $      */
   2
   3 /*
   4  * Copyright 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * Driver for the 10BASE-T portion of the AMD Am79c901 PHY.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __KERNEL_RCSID(0, "$NetBSD: amhphy.c,v 1.18 2008/05/04 17:06:09 xtraeme Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/kernel.h>
  48 #include <sys/device.h>
  49 #include <sys/socket.h>
  50 #include <sys/errno.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_media.h>
  54
  55 #include <dev/mii/mii.h>
  56 #include <dev/mii/miivar.h>
  57 #include <dev/mii/miidevs.h>
  58
  59 #include <dev/mii/amhphyreg.h>
  60
  61 static int      amhphymatch(device_t, cfdata_t, void *);
  62 static void     amhphyattach(device_t, device_t, void *);
  63
  64 CFATTACH_DECL_NEW(amhphy, sizeof(struct mii_softc),
  65     amhphymatch, amhphyattach, mii_phy_detach, mii_phy_activate);
  66
  67 static int      amhphy_service(struct mii_softc *, struct mii_data *, int);
  68 static void     amhphy_status(struct mii_softc *);
  69
  70 static const struct mii_phy_funcs amhphy_funcs = {
  71         amhphy_service, amhphy_status, mii_phy_reset,
  72 };
  73
  74 static const struct mii_phydesc amhphys[] = {
  75         { MII_OUI_yyAMD,                MII_MODEL_yyAMD_79c901,
  76           MII_STR_yyAMD_79c901 },
  77
  78         { 0,                            0,
  79           NULL },
  80 };
  81
  82 static int
  83 amhphymatch(device_t parent, cfdata_t match, void *aux)
  84 {
  85         struct mii_attach_args *ma = aux;
  86
  87         if (mii_phy_match(ma, amhphys) != NULL)
  88                 return (10);
  89
  90         return (0);
  91 }
  92
  93 static void
  94 amhphyattach(device_t parent, device_t self, void *aux)
  95 {
  96         struct mii_softc *sc = device_private(self);
  97         struct mii_attach_args *ma = aux;
  98         struct mii_data *mii = ma->mii_data;
  99         const struct mii_phydesc *mpd;
 100
 101         mpd = mii_phy_match(ma, amhphys);
 102         aprint_naive(": Media interface\n");
 103         aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));
 104
 105         sc->mii_dev = self;
 106         sc->mii_inst = mii->mii_instance;
 107         sc->mii_phy = ma->mii_phyno;
 108         sc->mii_funcs = &amhphy_funcs;
 109         sc->mii_pdata = mii;
 110         sc->mii_flags = ma->mii_flags;
 111         sc->mii_anegticks = MII_ANEGTICKS;
 112
 113         PHY_RESET(sc);
 114
 115         sc->mii_capabilities =
 116             PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
 117         aprint_normal_dev(self, "");
 118         if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0)
 119                 aprint_error("no media present");
 120         else
 121                 mii_phy_add_media(sc);
 122         aprint_normal("\n");
 123 }
 124
 125 static int
 126 amhphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
 127 {
 128         struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
 129         int reg;
 130
 131         switch (cmd) {
 132         case MII_POLLSTAT:
 133                 /*
 134                  * If we're not polling our PHY instance, just return.
 135                  */
 136                 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
 137                         return (0);
 138                 break;
 139
 140         case MII_MEDIACHG:
 141                 /*
 142                  * If the media indicates a different PHY instance,
 143                  * isolate ourselves.
 144                  */
 145                 if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
 146                         reg = PHY_READ(sc, MII_BMCR);
 147                         PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
 148                         return (0);
 149                 }
 150
 151                 /*
 152                  * If the interface is not up, don't do anything.
 153                  */
 154                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
 155                         break;
 156
 157                 mii_phy_setmedia(sc);
 158                 break;
 159
 160         case MII_TICK:
 161                 /*
 162                  * If we're not currently selected, just return.
 163                  */
 164                 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
 165                         return (0);
 166
 167                 if (mii_phy_tick(sc) == EJUSTRETURN)
 168                         return (0);
 169                 break;
 170
 171         case MII_DOWN:
 172                 mii_phy_down(sc);
 173                 return (0);
 174         }
 175
 176         /* Update the media status. */
 177         mii_phy_status(sc);
 178
 179         /* Callback if something changed. */
 180         mii_phy_update(sc, cmd);
 181         return (0);
 182 }
 183
 184 static void
 185 amhphy_status(struct mii_softc *sc)
 186 {
 187         struct mii_data *mii = sc->mii_pdata;
 188         struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
 189         int bmsr, bmcr, ssr;
 190
 191         mii->mii_media_status = IFM_AVALID;
 192         mii->mii_media_active = IFM_ETHER;
 193
 194         bmsr = PHY_READ(sc, MII_BMSR);
 195         ssr = PHY_READ(sc, MII_AMHPHY_SSR);
 196
 197         if (ssr & SSR_LS)
 198                 mii->mii_media_status |= IFM_ACTIVE;
 199
 200         bmcr = PHY_READ(sc, MII_BMCR);
 201         if (bmcr & BMCR_ISO) {
 202                 mii->mii_media_active |= IFM_NONE;
 203                 mii->mii_media_status = 0;
 204                 return;
 205         }
 206
 207         if (bmcr & BMCR_LOOP)
 208                 mii->mii_media_active |= IFM_LOOP;
 209
 210         if (bmcr & BMCR_AUTOEN) {
 211                 /*
 212                  * The media status bits are only valid of autonegotiation
 213                  * has completed (or it's disabled).
 214                  */
 215                 if ((bmsr & BMSR_ACOMP) == 0) {
 216                         /* Erg, still trying, I guess... */
 217                         mii->mii_media_active |= IFM_NONE;
 218                         return;
 219                 }
 220
 221                 if (ssr & SSR_S) {
 222                         /*
 223                          * This should't really ever happen, since it's
 224                          * a 10BASE-T only PHY.  But the bit exists,
 225                          * according to the documentation, so we pay
 226                          * attention to it.
 227                          */
 228                         mii->mii_media_active |= IFM_100_TX;
 229                 } else
 230                         mii->mii_media_active |= IFM_10_T;
 231                 if (ssr & SSR_FD)
 232                         mii->mii_media_active |= IFM_FDX;
 233         } else
 234                 mii->mii_media_active = ife->ifm_media;
 235 }