mii.c

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    1 /*      $NetBSD: mii.c,v 1.12 1999/08/03 19:41:49 drochner Exp $        */
    2 
    3 /*-
    4  * Copyright (c) 1998 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  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the NetBSD
   22  *      Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 /*
   44  * MII bus layer, glues MII-capable network interface drivers to sharable
   45  * PHY drivers.  This exports an interface compatible with BSD/OS 3.0's,
   46  * plus some NetBSD extensions.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/socket.h>
   52 #include <sys/malloc.h>
   53 #include <sys/module.h>
   54 #include <sys/bus.h> 
   55 
   56 #include <net/if.h>
   57 #include <net/if_media.h>
   58 #include <net/route.h>
   59 
   60 #include <dev/mii/mii.h>
   61 #include <dev/mii/miivar.h>
   62 
   63 MODULE_VERSION(miibus, 1);
   64 
   65 #include "miibus_if.h"
   66 
   67 static int miibus_print_child(device_t dev, device_t child);
   68 static int miibus_child_location_str(device_t bus, device_t child, char *buf,
   69     size_t buflen);
   70 static int miibus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
   71     size_t buflen);
   72 static int miibus_readreg(device_t, int, int);
   73 static int miibus_writereg(device_t, int, int, int);
   74 static void miibus_statchg(device_t);
   75 static void miibus_linkchg(device_t);
   76 static void miibus_mediainit(device_t);
   77 
   78 static device_method_t miibus_methods[] = {
   79         /* device interface */
   80         DEVMETHOD(device_probe,         miibus_probe),
   81         DEVMETHOD(device_attach,        miibus_attach),
   82         DEVMETHOD(device_detach,        miibus_detach),
   83         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   84 
   85         /* bus interface */
   86         DEVMETHOD(bus_print_child,      miibus_print_child),
   87         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
   88         DEVMETHOD(bus_child_pnpinfo_str, miibus_child_pnpinfo_str),
   89         DEVMETHOD(bus_child_location_str, miibus_child_location_str),
   90 
   91         /* MII interface */
   92         DEVMETHOD(miibus_readreg,       miibus_readreg),
   93         DEVMETHOD(miibus_writereg,      miibus_writereg),
   94         DEVMETHOD(miibus_statchg,       miibus_statchg),    
   95         DEVMETHOD(miibus_linkchg,       miibus_linkchg),    
   96         DEVMETHOD(miibus_mediainit,     miibus_mediainit),    
   97 
   98         { 0, 0 }
   99 };
  100 
  101 devclass_t miibus_devclass;
  102 
  103 driver_t miibus_driver = {
  104         "miibus",
  105         miibus_methods,
  106         sizeof(struct mii_data)
  107 };
  108 
  109 struct miibus_ivars {
  110         ifm_change_cb_t ifmedia_upd;
  111         ifm_stat_cb_t   ifmedia_sts;
  112 };
  113 
  114 /*
  115  * Helper function used by network interface drivers, attaches PHYs
  116  * to the network interface driver parent.
  117  */
  118 int
  119 miibus_probe(device_t dev)
  120 {
  121         struct mii_attach_args  ma, *args;
  122         struct mii_data         *mii;
  123         device_t                child = NULL, parent;
  124         int                     bmsr, capmask = 0xFFFFFFFF;
  125 
  126         mii = device_get_softc(dev);
  127         parent = device_get_parent(dev);
  128         LIST_INIT(&mii->mii_phys);
  129 
  130         for (ma.mii_phyno = 0; ma.mii_phyno < MII_NPHY; ma.mii_phyno++) {
  131                 /*
  132                  * Check to see if there is a PHY at this address.  Note,
  133                  * many braindead PHYs report 0/0 in their ID registers,
  134                  * so we test for media in the BMSR.
  135                  */
  136                 bmsr = MIIBUS_READREG(parent, ma.mii_phyno, MII_BMSR);
  137                 if (bmsr == 0 || bmsr == 0xffff ||
  138                     (bmsr & (BMSR_EXTSTAT|BMSR_MEDIAMASK)) == 0) {
  139                         /* Assume no PHY at this address. */
  140                         continue;
  141                 }
  142 
  143                 /*
  144                  * Extract the IDs. Braindead PHYs will be handled by
  145                  * the `ukphy' driver, as we have no ID information to
  146                  * match on.
  147                  */
  148                 ma.mii_id1 = MIIBUS_READREG(parent, ma.mii_phyno,
  149                     MII_PHYIDR1);
  150                 ma.mii_id2 = MIIBUS_READREG(parent, ma.mii_phyno,
  151                     MII_PHYIDR2);
  152 
  153                 ma.mii_data = mii;
  154                 ma.mii_capmask = capmask;
  155 
  156                 args = malloc(sizeof(struct mii_attach_args),
  157                     M_DEVBUF, M_NOWAIT);
  158                 bcopy((char *)&ma, (char *)args, sizeof(ma));
  159                 child = device_add_child(dev, NULL, -1);
  160                 device_set_ivars(child, args);
  161         }
  162 
  163         if (child == NULL)
  164                 return(ENXIO);
  165 
  166         device_set_desc(dev, "MII bus");
  167 
  168         return(0);
  169 }
  170 
  171 int
  172 miibus_attach(device_t dev)
  173 {
  174         struct miibus_ivars     *ivars;
  175         struct mii_data         *mii;
  176 
  177         mii = device_get_softc(dev);
  178         /*
  179          * Note that each NIC's softc must start with an ifnet pointer.
  180          * XXX: EVIL HACK!
  181          */
  182         mii->mii_ifp = *(struct ifnet**)device_get_softc(device_get_parent(dev));
  183         ivars = device_get_ivars(dev);
  184         ifmedia_init(&mii->mii_media, IFM_IMASK, ivars->ifmedia_upd,
  185             ivars->ifmedia_sts);
  186         bus_generic_attach(dev);
  187 
  188         return(0);
  189 }
  190 
  191 int
  192 miibus_detach(device_t dev)
  193 {
  194         struct mii_data         *mii;
  195 
  196         bus_generic_detach(dev);
  197         mii = device_get_softc(dev);
  198         ifmedia_removeall(&mii->mii_media);
  199         mii->mii_ifp = NULL;
  200 
  201         return(0);
  202 }
  203 
  204 static int
  205 miibus_print_child(device_t dev, device_t child)
  206 {
  207         struct mii_attach_args *ma;
  208         int retval;
  209 
  210         ma = device_get_ivars(child);
  211         retval = bus_print_child_header(dev, child);
  212         retval += printf(" PHY %d", ma->mii_phyno);
  213         retval += bus_print_child_footer(dev, child);
  214 
  215         return (retval);
  216 }
  217 
  218 static int
  219 miibus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
  220     size_t buflen)
  221 {
  222         struct mii_attach_args *maa = device_get_ivars(child);
  223         snprintf(buf, buflen, "oui=0x%x model=0x%x rev=0x%x",
  224             MII_OUI(maa->mii_id1, maa->mii_id2),
  225             MII_MODEL(maa->mii_id2), MII_REV(maa->mii_id2));
  226         return (0);
  227 }
  228 
  229 static int
  230 miibus_child_location_str(device_t bus, device_t child, char *buf,
  231     size_t buflen)
  232 {
  233         struct mii_attach_args *maa = device_get_ivars(child);
  234         snprintf(buf, buflen, "phyno=%d", maa->mii_phyno);
  235         return (0);
  236 }
  237 
  238 static int
  239 miibus_readreg(device_t dev, int phy, int reg)
  240 {
  241         device_t                parent;
  242 
  243         parent = device_get_parent(dev);
  244         return(MIIBUS_READREG(parent, phy, reg));
  245 }
  246 
  247 static int
  248 miibus_writereg(device_t dev, int phy, int reg, int data)
  249 {
  250         device_t                parent;
  251 
  252         parent = device_get_parent(dev);
  253         return(MIIBUS_WRITEREG(parent, phy, reg, data));
  254 }
  255 
  256 static void
  257 miibus_statchg(device_t dev)
  258 {
  259         device_t                parent;
  260         struct mii_data         *mii;
  261         struct ifnet            *ifp;
  262 
  263         parent = device_get_parent(dev);
  264         MIIBUS_STATCHG(parent);
  265 
  266         mii = device_get_softc(dev);
  267 
  268         /*
  269          * Note that each NIC's softc must start with an ifnet pointer.
  270          * XXX: EVIL HACK!
  271          */
  272         ifp = *(struct ifnet **)device_get_softc(parent);
  273         ifp->if_baudrate = ifmedia_baudrate(mii->mii_media_active);
  274         return;
  275 }
  276 
  277 static void
  278 miibus_linkchg(device_t dev)
  279 {
  280         struct mii_data         *mii;
  281         device_t                parent;
  282         int                     link_state;
  283 
  284         parent = device_get_parent(dev);
  285         MIIBUS_LINKCHG(parent);
  286 
  287         mii = device_get_softc(dev);
  288         
  289         if (mii->mii_media_status & IFM_AVALID) {
  290                 if (mii->mii_media_status & IFM_ACTIVE)
  291                         link_state = LINK_STATE_UP;
  292                 else
  293                         link_state = LINK_STATE_DOWN;
  294         } else
  295                 link_state = LINK_STATE_UNKNOWN;
  296         /*
  297          * Note that each NIC's softc must start with an ifnet pointer.
  298          * XXX: EVIL HACK!
  299          */
  300         if_link_state_change(*(struct ifnet**)device_get_softc(parent), link_state);
  301 }
  302 
  303 static void
  304 miibus_mediainit(device_t dev)
  305 {
  306         struct mii_data         *mii;
  307         struct ifmedia_entry    *m;
  308         int                     media = 0;
  309 
  310         /* Poke the parent in case it has any media of its own to add. */
  311         MIIBUS_MEDIAINIT(device_get_parent(dev));
  312 
  313         mii = device_get_softc(dev);
  314         LIST_FOREACH(m, &mii->mii_media.ifm_list, ifm_list) {
  315                 media = m->ifm_media;
  316                 if (media == (IFM_ETHER|IFM_AUTO))
  317                         break;
  318         }
  319 
  320         ifmedia_set(&mii->mii_media, media);
  321 
  322         return;
  323 }
  324 
  325 int
  326 mii_phy_probe(device_t dev, device_t *child, ifm_change_cb_t ifmedia_upd,
  327     ifm_stat_cb_t ifmedia_sts)
  328 {
  329         struct miibus_ivars     *ivars;
  330         int                     bmsr, i;
  331 
  332         ivars = malloc(sizeof(*ivars), M_DEVBUF, M_NOWAIT);
  333         if (ivars == NULL)
  334                 return (ENOMEM);
  335         ivars->ifmedia_upd = ifmedia_upd;
  336         ivars->ifmedia_sts = ifmedia_sts;
  337         *child = device_add_child(dev, "miibus", -1);
  338         device_set_ivars(*child, ivars);
  339 
  340         for (i = 0; i < MII_NPHY; i++) {
  341                 bmsr = MIIBUS_READREG(dev, i, MII_BMSR);
  342                 if (bmsr == 0 || bmsr == 0xffff ||
  343                     (bmsr & (BMSR_EXTSTAT|BMSR_MEDIAMASK)) == 0) {
  344                         /* Assume no PHY at this address. */
  345                         continue;
  346                 } else
  347                         break;
  348         }
  349 
  350         if (i == MII_NPHY) {
  351                 device_delete_child(dev, *child);
  352                 *child = NULL;
  353                 return(ENXIO);
  354         }
  355 
  356         bus_generic_attach(dev);
  357 
  358         return(0);
  359 }
  360 
  361 /*
  362  * Media changed; notify all PHYs.
  363  */
  364 int
  365 mii_mediachg(struct mii_data *mii)
  366 {
  367         struct mii_softc *child;
  368         int rv;
  369 
  370         mii->mii_media_status = 0;
  371         mii->mii_media_active = IFM_NONE;
  372 
  373         LIST_FOREACH(child, &mii->mii_phys, mii_list) {
  374                 rv = (*child->mii_service)(child, mii, MII_MEDIACHG);
  375                 if (rv)
  376                         return (rv);
  377         }
  378         return (0);
  379 }
  380 
  381 /*
  382  * Call the PHY tick routines, used during autonegotiation.
  383  */
  384 void
  385 mii_tick(struct mii_data *mii)
  386 {
  387         struct mii_softc *child;
  388 
  389         LIST_FOREACH(child, &mii->mii_phys, mii_list)
  390                 (void) (*child->mii_service)(child, mii, MII_TICK);
  391 }
  392 
  393 /*
  394  * Get media status from PHYs.
  395  */
  396 void
  397 mii_pollstat(struct mii_data *mii)
  398 {
  399         struct mii_softc *child;
  400 
  401         mii->mii_media_status = 0;
  402         mii->mii_media_active = IFM_NONE;
  403 
  404         LIST_FOREACH(child, &mii->mii_phys, mii_list)
  405                 (void) (*child->mii_service)(child, mii, MII_POLLSTAT);
  406 }
  407 
  408 /*
  409  * Inform the PHYs that the interface is down.
  410  */
  411 void
  412 mii_down(struct mii_data *mii)
  413 {
  414         struct mii_softc *child;
  415 
  416         LIST_FOREACH(child, &mii->mii_phys, mii_list)
  417                 mii_phy_down(child);
  418 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mii/mii.c

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