sys/dev/mii/pnaphy.c

   1 /*      $NetBSD: pnaphy.c,v 1.19 2008/05/04 17:06:10 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 generic HomePNA 1.0 PHYs.
  40  *
  41  * HomePNA 1.0 PHYs are pretty simple -- they support exactly one
  42  * media type, and don't do autonegotiation.
  43  *
  44  * HomePNA PHYs often have vendor-specific registers for tuning
  45  * the network connection, but we don't deal with any of that
  46  * at all.
  47  */
  48
  49 #include <sys/cdefs.h>
  50 __KERNEL_RCSID(0, "$NetBSD: pnaphy.c,v 1.19 2008/05/04 17:06:10 xtraeme Exp $");
  51
  52 #include <sys/param.h>
  53 #include <sys/systm.h>
  54 #include <sys/kernel.h>
  55 #include <sys/device.h>
  56 #include <sys/socket.h>
  57 #include <sys/errno.h>
  58
  59 #include <net/if.h>
  60 #include <net/if_media.h>
  61
  62 #include <dev/mii/mii.h>
  63 #include <dev/mii/miivar.h>
  64 #include <dev/mii/miidevs.h>
  65
  66 static int      pnaphymatch(device_t, cfdata_t, void *);
  67 static void     pnaphyattach(device_t, device_t, void *);
  68
  69 CFATTACH_DECL_NEW(pnaphy, sizeof(struct mii_softc),
  70     pnaphymatch, pnaphyattach, mii_phy_detach, mii_phy_activate);
  71
  72 static int      pnaphy_service(struct mii_softc *, struct mii_data *, int);
  73 static void     pnaphy_status(struct mii_softc *);
  74
  75 static const struct mii_phy_funcs pnaphy_funcs = {
  76         pnaphy_service, pnaphy_status, mii_phy_reset,
  77 };
  78
  79 static const struct mii_phydesc pnaphys[] = {
  80         { MII_OUI_yyAMD,                MII_MODEL_yyAMD_79c901home,
  81           MII_STR_yyAMD_79c901home },
  82
  83         { 0,                            0,
  84           NULL },
  85 };
  86
  87 static int
  88 pnaphymatch(device_t parent, cfdata_t match, void *aux)
  89 {
  90         struct mii_attach_args *ma = aux;
  91
  92         if (mii_phy_match(ma, pnaphys) != NULL) {
  93                 /*
  94                  * Match higher than ukphy, but lower than a specific
  95                  * driver would match.
  96                  */
  97                 return (2);
  98         }
  99
 100         return (0);
 101 }
 102
 103 static void
 104 pnaphyattach(device_t parent, device_t self, void *aux)
 105 {
 106         struct mii_softc *sc = device_private(self);
 107         struct mii_attach_args *ma = aux;
 108         struct mii_data *mii = ma->mii_data;
 109         const struct mii_phydesc *mpd;
 110
 111         mpd = mii_phy_match(ma, pnaphys);
 112         aprint_naive(": Media interface\n");
 113         aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));
 114
 115         sc->mii_dev = self;
 116         sc->mii_inst = mii->mii_instance;
 117         sc->mii_phy = ma->mii_phyno;
 118         sc->mii_funcs = &pnaphy_funcs;
 119         sc->mii_pdata = mii;
 120         sc->mii_flags = ma->mii_flags | MIIF_IS_HPNA; /* force HomePNA */
 121         sc->mii_anegticks = MII_ANEGTICKS;
 122
 123         PHY_RESET(sc);
 124
 125         sc->mii_capabilities =
 126             PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
 127         aprint_normal_dev(self, "");
 128         if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0)
 129                 aprint_error("no media present");
 130         else
 131                 mii_phy_add_media(sc);
 132         aprint_normal("\n");
 133 }
 134
 135 static int
 136 pnaphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
 137 {
 138         struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
 139         int reg;
 140
 141         switch (cmd) {
 142         case MII_POLLSTAT:
 143                 /*
 144                  * If we're not polling our PHY instance, just return.
 145                  */
 146                 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
 147                         return (0);
 148                 break;
 149
 150         case MII_MEDIACHG:
 151                 /*
 152                  * If the media indicates a different PHY instance,
 153                  * isolate ourselves.
 154                  */
 155                 if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
 156                         reg = PHY_READ(sc, MII_BMCR);
 157                         PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
 158                         return (0);
 159                 }
 160
 161                 /*
 162                  * If the interface is not up, don't do anything.
 163                  */
 164                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
 165                         break;
 166
 167                 mii_phy_setmedia(sc);
 168                 break;
 169
 170         case MII_TICK:
 171                 /*
 172                  * If we're not currently selected, just return.
 173                  */
 174                 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
 175                         return (0);
 176
 177                 if (mii_phy_tick(sc) == EJUSTRETURN)
 178                         return (0);
 179                 break;
 180
 181         case MII_DOWN:
 182                 mii_phy_down(sc);
 183                 return (0);
 184         }
 185
 186         /* Update the media status. */
 187         mii_phy_status(sc);
 188
 189         /* Callback if something changed. */
 190         mii_phy_update(sc, cmd);
 191         return (0);
 192 }
 193
 194 static void
 195 pnaphy_status(struct mii_softc *sc)
 196 {
 197         struct mii_data *mii = sc->mii_pdata;
 198         struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
 199         int bmsr, bmcr;
 200
 201         mii->mii_media_status = IFM_AVALID;
 202         mii->mii_media_active = IFM_ETHER;
 203
 204         bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
 205
 206         if (bmsr & BMSR_LINK)
 207                 mii->mii_media_status |= IFM_ACTIVE;
 208
 209         bmcr = PHY_READ(sc, MII_BMCR);
 210         if (bmcr & BMCR_ISO) {
 211                 mii->mii_media_active |= IFM_NONE;
 212                 mii->mii_media_status = 0;
 213                 return;
 214         }
 215
 216         if (bmcr & BMCR_LOOP)
 217                 mii->mii_media_active |= IFM_LOOP;
 218
 219         /*
 220          * On HomePNA PHYs, the current media is always the selected
 221          * media.
 222          *
 223          * XXX May not be the case w/ HomePNA 2.
 224          */
 225         mii->mii_media_active = ife->ifm_media;
 226 }