/*      $NetBSD: urlphy.c,v 1.40 2023/02/22 08:09:09 msaitoh Exp $      */
/*
* Copyright (c) 2001, 2002
*     Shingo WATANABE <[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, 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.
* 3. Neither the name of the author nor the names of any co-contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* 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.
*
*/

/*
* driver for Realtek RL8150L internal phy
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: urlphy.c,v 1.40 2023/02/22 08:09:09 msaitoh Exp $");

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

#ifdef URLPHY_DEBUG
#define DPRINTF(x)      if (urlphydebug) printf x
#define DPRINTFN(n,x)   if (urlphydebug>(n)) printf x
int urlphydebug = URLPHY_DEBUG;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

static int      urlphy_match(device_t, cfdata_t, void *);
static void     urlphy_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(urlphy, sizeof(struct mii_softc),
   urlphy_match, urlphy_attach, mii_phy_detach, mii_phy_activate);

static int      urlphy_service(struct mii_softc *, struct mii_data *, int);
static void     urlphy_status(struct mii_softc *);

static const struct mii_phy_funcs urlphy_funcs = {
       urlphy_service, urlphy_status, mii_phy_reset,
};

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

       /* RTL8150 reports OUI == 0, MODEL == 0 */
       if (MII_OUI(ma->mii_id1, ma->mii_id2) != 0 &&
           MII_MODEL(ma->mii_id2) != 0)
               return 0;

       /* Make sure the parent is an 'url' device. */
       if (!device_is_a(parent, "url"))
               return 0;

       return 10;
}

static void
urlphy_attach(device_t parent, device_t self, void *aux)
{
       struct mii_softc *sc = device_private(self);
       struct mii_attach_args *ma = aux;
       struct mii_data *mii = ma->mii_data;

       aprint_naive(": Media interface\n");
       aprint_normal(": Realtek RTL8150L internal media interface\n");

       DPRINTF(("%s: %s: enter\n", device_xname(self), __func__));

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

       /* Don't do loopback on this PHY. */
       sc->mii_flags |= MIIF_NOLOOP;
       /* Don't do isolate on this PHY. */
       sc->mii_flags |= MIIF_NOISOLATE;

       if (mii->mii_instance != 0) {
               aprint_error_dev(self,
                   "ignoring this PHY, non-zero instance\n");
               return;
       }

       mii_lock(mii);

       PHY_RESET(sc);

       PHY_READ(sc, MII_BMSR, &sc->mii_capabilities);
       sc->mii_capabilities &= ma->mii_capmask;

       mii_unlock(mii);

       mii_phy_add_media(sc);
}

static int
urlphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
       struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
       uint16_t reg;

       DPRINTF(("%s: %s: enter\n", device_xname(sc->mii_dev), __func__));

       switch (cmd) {
       case MII_POLLSTAT:
               /* If we're not polling our PHY instance, just return. */
               if (IFM_INST(ife->ifm_media) != sc->mii_inst)
                       return 0;
               break;

       case MII_MEDIACHG:
               /* If we're not currently selected, just return. */
               if (IFM_INST(ife->ifm_media) != sc->mii_inst)
                       return 0;

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

               mii_phy_setmedia(sc);
               break;

       case MII_TICK:
               /* If we're not currently selected, just return. */
               if (IFM_INST(ife->ifm_media) != sc->mii_inst)
                       return 0;

               /* Just bail now if the interface is down. */
               if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                       return 0;

               /*
                * If we're not doing autonegotiation, we don't need to do
                * any extra work here.  However, we need to check the link
                * status so we can generate an announcement if the status
                * changes.
                */
               if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
                       break;

               /* Read the status register twice; MSR_LINK is latch-low. */
               PHY_READ(sc, URLPHY_MSR, &reg);
               PHY_READ(sc, URLPHY_MSR, &reg);
               if (reg & URLPHY_MSR_LINK) {
                       /*
                        * Reset autonegotiation timer to 0 in case the link
                        * goes down in the next tick.
                        */
                       sc->mii_ticks = 0;
                       /* See above. */
                       break;
               }

               /*
                * mii_ticks == 0 means it's the first tick after changing the
                * media or the link became down since the last tick (see
                * above), so break to update the status.
                */
               if (sc->mii_ticks++ == 0)
                       break;

               /* Only retry autonegotiation every N seconds. */
               KASSERT(sc->mii_anegticks != 0);
               if (sc->mii_ticks < sc->mii_anegticks)
                       return 0;

               if (mii_phy_auto_restart(sc) == EJUSTRETURN)
                       return 0;

               break;

       case MII_DOWN:
               mii_phy_down(sc);
               return 0;
       }

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

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

       return 0;
}

static void
urlphy_status(struct mii_softc *sc)
{
       struct mii_data *mii = sc->mii_pdata;
       struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
       uint16_t msr, bmsr, bmcr;

       DPRINTF(("%s: %s: enter\n", device_xname(sc->mii_dev), __func__));

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

       /*
        * The link status bit is not exist in the BMSR register,
        * so we need to read the MSR register to get link status.
        */
       PHY_READ(sc, URLPHY_MSR, &msr);
       PHY_READ(sc, URLPHY_MSR, &msr);
       if (msr & URLPHY_MSR_LINK)
               mii->mii_media_status |= IFM_ACTIVE;

       DPRINTF(("%s: %s: link %s\n", device_xname(sc->mii_dev), __func__,
                mii->mii_media_status & IFM_ACTIVE ? "up" : "down"));

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

               if (msr & URLPHY_MSR_SPEED_100)
                       mii->mii_media_active |= IFM_100_TX;
               else
                       mii->mii_media_active |= IFM_10_T;

               if (msr & URLPHY_MSR_DUPLEX)
                       mii->mii_media_active |= IFM_FDX;
               else
                       mii->mii_media_active |= IFM_HDX;
       } else
               mii->mii_media_active = ife->ifm_media;
}

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