/*      $NetBSD: rdcphy.c,v 1.8 2020/04/08 03:01:58 msaitoh Exp $        */

/*-
* Copyright (c) 2010, Pyun YongHyeon <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice unmodified, this list of conditions, and the following
*    disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/* FreeBSD: src/sys/dev/mii/rdcphy.c,v 1.1 2010/12/30 23:50:25 yongari Exp */

/*
* Driver for the RDC Semiconductor R6040 10/100 PHY.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rdcphy.c,v 1.8 2020/04/08 03:01:58 msaitoh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/socket.h>
#include <sys/errno.h>

#include <sys/bus.h>

#include <net/if.h>
#include <net/if_media.h>

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <dev/mii/miidevs.h>

#include <dev/mii/rdcphyreg.h>

struct rdcphy_softc {
       struct mii_softc sc_mii;
       int              sc_mii_link_tick;
#define RDCPHY_MANNEG_TICK      3
};

static int      rdcphymatch(device_t, cfdata_t, void *);
static void     rdcphyattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(rdcphy, sizeof(struct rdcphy_softc),
   rdcphymatch, rdcphyattach, mii_phy_detach, mii_phy_activate);


static int      rdcphy_service(struct mii_softc *, struct mii_data *, int);
static void     rdcphy_status(struct mii_softc *);

static const struct mii_phy_funcs rdcphy_funcs = {
       rdcphy_service, rdcphy_status, mii_phy_reset,
};

static const struct mii_phydesc rdcphys[] = {
       MII_PHY_DESC(xxRDC, R6040),
       MII_PHY_DESC(xxRDC, R6040_2),
       MII_PHY_DESC(xxRDC, R6040_3),
       MII_PHY_END,
};

static int
rdcphymatch(device_t parent, cfdata_t match, void *aux)
{
       struct mii_attach_args *ma = aux;

       if (mii_phy_match(ma, rdcphys) != NULL)
               return 10;

       return 0;
}

static void
rdcphyattach(device_t parent, device_t self, void *aux)
{
       struct rdcphy_softc *rsc = device_private(self);
       struct mii_softc *sc = &rsc->sc_mii;
       struct mii_attach_args *ma = aux;
       struct mii_data *mii = ma->mii_data;

       const struct mii_phydesc *mpd;

       mpd = mii_phy_match(ma, rdcphys);
       aprint_naive(": Media interface\n");
       aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));

       sc->mii_dev = self;
       sc->mii_inst = mii->mii_instance;
       sc->mii_phy = ma->mii_phyno;
       sc->mii_funcs = &rdcphy_funcs;
       sc->mii_pdata = mii;
       sc->mii_flags = ma->mii_flags;

       mii_lock(mii);

       PHY_RESET(sc);

       PHY_READ(sc, MII_BMSR, &sc->mii_capabilities);
       sc->mii_capabilities &= ma->mii_capmask;
       if (sc->mii_capabilities & BMSR_EXTSTAT)
               PHY_READ(sc, MII_EXTSR, &sc->mii_extcapabilities);

       mii_unlock(mii);

       mii_phy_add_media(sc);
}

static int
rdcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
       struct rdcphy_softc *rsc = (struct rdcphy_softc *)sc;
       struct ifmedia_entry *ife = mii->mii_media.ifm_cur;

       KASSERT(mii_locked(mii));

       switch (cmd) {
       case MII_POLLSTAT:
               break;

       case MII_MEDIACHG:
               /* If the interface is not up, don't do anything. */
               if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                       break;

               mii_phy_setmedia(sc);
               switch (IFM_SUBTYPE(ife->ifm_media)) {
               case IFM_100_TX:
               case IFM_10_T:
                       /*
                        * Report fake lost link event to parent driver.  This
                        * will stop MAC of parent driver and make it possible
                        * to reconfigure MAC after completion of link
                        * establishment.
                        * Note, the parent MAC seems to require restarting MAC
                        * when underlying any PHY configuration was changed
                        * even if the resolved speed/duplex was not changed at
                        * all.
                        */
                       mii->mii_media_status = 0;
                       mii->mii_media_active = IFM_ETHER | IFM_NONE;
                       rsc->sc_mii_link_tick = RDCPHY_MANNEG_TICK;
                       /* Immediately report link down. */
                       mii_phy_update(sc, MII_MEDIACHG);
                       return 0;
               default:
                       break;
               }
               break;

       case MII_TICK:
               if (mii_phy_tick(sc) == EJUSTRETURN)
                       return 0;
               if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
                       /*
                        * It seems the PHY hardware does not correctly report
                        * link status changes when manual link configuration
                        * is in progress.  It is also possible for the PHY to
                        * complete establishing a link within one second such
                        * that mii(4) did not notice the link change.
                        * To workaround the issue, emulate lost link event and
                        * wait for 3 seconds when manual link configuration
                        * is in progress.  3 seconds would be long enough to
                        * absorb transient link flips.
                        */
                       if (rsc->sc_mii_link_tick > 0) {
                               rsc->sc_mii_link_tick--;
                               return 0;
                       }
               }
               break;
       }

       /* Update the media status. */
       rdcphy_status(sc);

       /* Callback if something changed. */
       mii_phy_update(sc, cmd);
       return 0;
}

static void
rdcphy_status(struct mii_softc *sc)
{
       struct mii_data *mii = sc->mii_pdata;
       uint16_t bmsr, bmcr, physts;

       KASSERT(mii_locked(mii));

       mii->mii_media_status = IFM_AVALID;
       mii->mii_media_active = IFM_ETHER;

       PHY_READ(sc, MII_BMSR, &bmsr);
       PHY_READ(sc, MII_BMSR, &bmsr);
       PHY_READ(sc, MII_RDCPHY_STATUS, &physts);

       if ((physts & STATUS_LINK_UP) != 0)
               mii->mii_media_status |= IFM_ACTIVE;

       PHY_READ(sc, MII_BMCR, &bmcr);
       if ((bmcr & BMCR_ISO) != 0) {
               mii->mii_media_active |= IFM_NONE;
               mii->mii_media_status = 0;
               return;
       }

       if ((bmcr & BMCR_LOOP) != 0)
               mii->mii_media_active |= IFM_LOOP;

       if ((bmcr & BMCR_AUTOEN) != 0) {
               if ((bmsr & BMSR_ACOMP) == 0) {
                       /* Erg, still trying, I guess... */
                       mii->mii_media_active |= IFM_NONE;
                       return;
               }
       }

       switch (physts & STATUS_SPEED_MASK) {
       case STATUS_SPEED_100:
               mii->mii_media_active |= IFM_100_TX;
               break;
       case STATUS_SPEED_10:
               mii->mii_media_active |= IFM_10_T;
               break;
       default:
               mii->mii_media_active |= IFM_NONE;
               return;
       }
       if ((physts & STATUS_FULL_DUPLEX) != 0)
               mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
       else
               mii->mii_media_active |= IFM_HDX;
}

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