/*	$OpenBSD: mtdphy.c,v 1.1 1998/12/28 03:37:55 jason Exp $	*/

/*
 * Copyright (c) 1998 Jason L. Wright (jason@thought.net)
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Jason L. Wright
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 the Myson Technology MTD972 100BaseTX PCS/PMA.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.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/mtdphyreg.h>

int	mtdphymatch __P((struct device *, void *, void *));
void	mtdphyattach __P((struct device *, struct device *, void *));

struct cfattach mtdphy_ca = {
	sizeof(struct mii_softc), mtdphymatch, mtdphyattach
};

struct cfdriver mtdphy_cd = {
	NULL, "mtdphy", DV_DULL
};

int	mtdphy_service __P((struct mii_softc *, struct mii_data *, int));

int
mtdphymatch(parent, match, aux)
	struct device *parent;
	void *match;
	void *aux;
{
	struct mii_attach_args *ma = aux;

	if (MII_OUI(ma->mii_id1, ma->mii_id2) == MII_OUI_MYSON &&
	    MII_MODEL(ma->mii_id2) == MII_MODEL_MYSON_MTD972)
		return (10);

	return (0);
}

void
mtdphyattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct mii_softc *sc = (struct mii_softc *)self;
	struct mii_attach_args *ma = aux;
	struct mii_data *mii = ma->mii_data;

	printf(": %s, rev. %d\n", MII_STR_MYSON_MTD972, MII_REV(ma->mii_id2));

	sc->mii_inst = mii->mii_instance;
	sc->mii_phy = ma->mii_phyno;
	sc->mii_service = mtdphy_service;
	sc->mii_pdata = mii;

	ifmedia_add(&mii->mii_media,
	    IFM_MAKEWORD(IFM_ETHER, IFM_NONE, 0, sc->mii_inst),
	    BMCR_ISO, NULL);
	ifmedia_add(&mii->mii_media,
	    IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst),
	    BMCR_LOOP | BMCR_S100, NULL);

	mii_phy_reset(sc);

	sc->mii_capabilities =
	    PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
	printf("%s: ", sc->mii_dev.dv_xname);
	if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0)
		printf("no media present");
	else
		mii_add_media(mii, sc->mii_capabilities,
		    sc->mii_inst);
	printf("\n");
}

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

	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 the interface is not up, don't do anything.
		 */
		if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
			reg = PHY_READ(sc, MII_BMCR);
			PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
			return (0);
		}

		if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
			break;

		switch (IFM_SUBTYPE(ife->ifm_media)) {
		case IFM_AUTO:
			/*
			 * If we're already in auto mode, just return.
			 */
			if (PHY_READ(sc, MII_BMCR) & BMCR_AUTOEN)
				return (0);
			(void) mii_phy_auto(sc);
			break;

		case IFM_100_TX:
			PHY_WRITE(sc, MII_ANAR,
			    mii_anar(ife->ifm_media));

			reg = BMCR_ISO | BMCR_S100;
			if ((ife->ifm_media & IFM_GMASK) == IFM_FDX)
				reg |= BMCR_FDX;
			PHY_WRITE(sc, MII_BMCR, reg);
			delay(75000);

			reg &= ~BMCR_ISO;
			PHY_WRITE(sc, MII_BMCR, reg);
			break;

		case IFM_100_T4:
			/*
			 * Not supported by MTD972.
			 */
			return (EINVAL);
		default:
			/*
			 * BMCR data is stored in the ifmedia entry.
			 */
			PHY_WRITE(sc, MII_ANAR,
			    mii_anar(ife->ifm_media));
			PHY_WRITE(sc, MII_BMCR, ife->ifm_data);
		}
		break;

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

		/*
		 * Only used for autonegotiation.
		 */
		if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
			return (0);

		/*
		 * Is the interface even up?
		 */
		if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
			return (0);

		/*
		 * The MTD972 autonegotiation doesn't need to be
		 * kicked; it continues in the background.
		 */
		break;
	}

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

	/* Callback if something changed. */
	if (sc->mii_active != mii->mii_media_active || cmd == MII_MEDIACHG) {
		(*mii->mii_statchg)(sc->mii_dev.dv_parent);
		sc->mii_active = mii->mii_media_active;
	}
	return (0);
}