/*      $NetBSD: dl10019.c,v 1.17 2021/07/01 20:39:15 thorpej Exp $     */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dl10019.c,v 1.17 2021/07/01 20:39:15 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/device.h>

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

#include <sys/bus.h>
#include <sys/intr.h>

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

#include <dev/ic/dp8390reg.h>
#include <dev/ic/dp8390var.h>

#include <dev/ic/ne2000reg.h>
#include <dev/ic/ne2000var.h>

#include <dev/ic/dl10019reg.h>
#include <dev/ic/dl10019var.h>

int     dl10019_mii_readreg(device_t, int, int, uint16_t *);
int     dl10019_mii_writereg(device_t, int, int, uint16_t);
void    dl10019_mii_statchg(struct ifnet *);

/*
 * MII bit-bang glue.
 */
u_int32_t dl10019_mii_bitbang_read(device_t);
void dl10019_mii_bitbang_write(device_t, u_int32_t);

const struct mii_bitbang_ops dl10019_mii_bitbang_ops = {
        dl10019_mii_bitbang_read,
        dl10019_mii_bitbang_write,
        {
                DL0_GPIO_MII_DATAOUT,   /* MII_BIT_MDO */
                DL0_GPIO_MII_DATAIN,    /* MII_BIT_MDI */
                DL0_GPIO_MII_CLK,       /* MII_BIT_MDC */
                DL0_19_GPIO_MII_DIROUT, /* MII_BIT_DIR_HOST_PHY */
                0,                      /* MII_BIT_DIR_PHY_HOST */
        }
};

const struct mii_bitbang_ops dl10022_mii_bitbang_ops = {
        dl10019_mii_bitbang_read,
        dl10019_mii_bitbang_write,
        {
                DL0_GPIO_MII_DATAOUT,   /* MII_BIT_MDO */
                DL0_GPIO_MII_DATAIN,    /* MII_BIT_MDI */
                DL0_GPIO_MII_CLK,       /* MII_BIT_MDC */
                DL0_22_GPIO_MII_DIROUT, /* MII_BIT_DIR_HOST_PHY */
                0,                      /* MII_BIT_DIR_PHY_HOST */
        }
};

static void
dl10019_mii_reset(struct dp8390_softc *sc)
{
        struct ne2000_softc *nsc = (void *) sc;
        int i;

        if (nsc->sc_type != NE2000_TYPE_DL10022)
                return;

        for (i = 0; i < 2; i++) {
                bus_space_write_1(sc->sc_regt, sc->sc_regh, NEDL_DL0_GPIO,
                    0x08);
                delay(1);
                bus_space_write_1(sc->sc_regt, sc->sc_regh, NEDL_DL0_GPIO,
                    0x0c);
                delay(1);
        }
        bus_space_write_1(sc->sc_regt, sc->sc_regh, NEDL_DL0_GPIO, 0x00);
}

static void
dl10019_tick(void *arg)
{
        struct dp8390_softc *sc = arg;
        int s;

        s = splnet();
        mii_tick(&sc->sc_mii);
        splx(s);

        callout_schedule(&sc->sc_tick_ch, hz);
}

void
dl10019_media_init(struct dp8390_softc *sc)
{
        struct ifnet *ifp = &sc->sc_ec.ec_if;
        struct mii_data *mii = &sc->sc_mii;

        callout_setfunc(&sc->sc_tick_ch, dl10019_tick, sc);

        sc->sc_ec.ec_mii = mii;

        mii->mii_ifp = ifp;
        mii->mii_readreg = dl10019_mii_readreg;
        mii->mii_writereg = dl10019_mii_writereg;
        mii->mii_statchg = dl10019_mii_statchg;
        ifmedia_init(&mii->mii_media, IFM_IMASK, dp8390_mediachange,
            dp8390_mediastatus);

        dl10019_mii_reset(sc);

        mii_attach(sc->sc_dev, mii, 0xffffffff, MII_PHY_ANY,
            MII_OFFSET_ANY, 0);

        if (LIST_FIRST(&mii->mii_phys) == NULL) {
                ifmedia_add(&mii->mii_media, IFM_ETHER | IFM_NONE, 0, NULL);
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_NONE);
        } else
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_AUTO);
}

void
dl10019_media_fini(struct dp8390_softc *sc)
{

        callout_stop(&sc->sc_tick_ch);
        mii_detach(&sc->sc_mii, MII_PHY_ANY, MII_OFFSET_ANY);
        /* dp8390_detach() will call ifmedia_fini(). */
}

int
dl10019_mediachange(struct dp8390_softc *sc)
{
        int rc;

        if ((rc = mii_mediachg(&sc->sc_mii)) == ENXIO)
                return 0;
        return rc;
}

void
dl10019_mediastatus(struct dp8390_softc *sc, struct ifmediareq *ifmr)
{

        mii_pollstat(&sc->sc_mii);
        ifmr->ifm_status = sc->sc_mii.mii_media_status;
        ifmr->ifm_active = sc->sc_mii.mii_media_active;
}

void
dl10019_init_card(struct dp8390_softc *sc)
{

        dl10019_mii_reset(sc);
        mii_mediachg(&sc->sc_mii);
        callout_schedule(&sc->sc_tick_ch, hz);
}

void
dl10019_stop_card(struct dp8390_softc *sc)
{

        callout_stop(&sc->sc_tick_ch);
        mii_down(&sc->sc_mii);
}

u_int32_t
dl10019_mii_bitbang_read(device_t self)
{
        struct dp8390_softc *sc = device_private(self);

        /* We're already in Page 0. */
        return (bus_space_read_1(sc->sc_regt, sc->sc_regh, NEDL_DL0_GPIO) &
            ~DL0_GPIO_PRESERVE);
}

void
dl10019_mii_bitbang_write(device_t self, u_int32_t val)
{
        struct dp8390_softc *sc = device_private(self);
        u_int8_t gpio;

        /* We're already in Page 0. */
        gpio = bus_space_read_1(sc->sc_regt, sc->sc_regh, NEDL_DL0_GPIO);
        bus_space_write_1(sc->sc_regt, sc->sc_regh, NEDL_DL0_GPIO,
            (val & ~DL0_GPIO_PRESERVE) | (gpio & DL0_GPIO_PRESERVE));
}

int
dl10019_mii_readreg(device_t self, int phy, int reg, uint16_t *val)
{
        struct ne2000_softc *nsc = device_private(self);
        const struct mii_bitbang_ops *ops;

        ops = (nsc->sc_type == NE2000_TYPE_DL10022) ?
            &dl10022_mii_bitbang_ops : &dl10019_mii_bitbang_ops;

        return mii_bitbang_readreg(self, ops, phy, reg, val);
}

int
dl10019_mii_writereg(device_t self, int phy, int reg, uint16_t val)
{
        struct ne2000_softc *nsc = device_private(self);
        const struct mii_bitbang_ops *ops;

        ops = (nsc->sc_type == NE2000_TYPE_DL10022) ?
            &dl10022_mii_bitbang_ops : &dl10019_mii_bitbang_ops;

        return mii_bitbang_writereg(self, ops, phy, reg, val);
}

void
dl10019_mii_statchg(struct ifnet *ifp)
{
        struct ne2000_softc *nsc = ifp->if_softc;
        struct dp8390_softc *sc = &nsc->sc_dp8390;

        /*
         * Disable collision detection on the DL10022 if
         * we are on a full-duplex link.
         */
        if (nsc->sc_type == NE2000_TYPE_DL10022) {
                u_int8_t diag;

                if (sc->sc_mii.mii_media_active & IFM_FDX)
                        diag = DL0_DIAG_NOCOLLDETECT;
                else
                        diag = 0;
                bus_space_write_1(sc->sc_regt, sc->sc_regh,
                    NEDL_DL0_DIAG, diag);
        }
}