/*	$NetBSD: exphy.c,v 1.16 1999/04/23 04:24:32 thorpej Exp $	*/

/*-
 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center, and by Frank van der Linden.
 *
 * 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.
 */

/*-
 * Copyright (c) 1997 Manuel Bouyer.  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.
 *
 * 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * driver for 3Com internal PHYs
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/module.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 "miidevs.h"

#include "miibus_if.h"

static int exphy_probe(device_t);
static int exphy_attach(device_t);

static device_method_t exphy_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		exphy_probe),
	DEVMETHOD(device_attach,	exphy_attach),
	DEVMETHOD(device_detach,	mii_phy_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	{ 0, 0 }
};

static devclass_t exphy_devclass;

static driver_t exphy_driver = {
	"xlphy",
	exphy_methods,
	sizeof(struct mii_softc)
};

DRIVER_MODULE(xlphy, miibus, exphy_driver, exphy_devclass, 0, 0);

static int	exphy_service(struct mii_softc *, struct mii_data *, int);
static void	exphy_reset(struct mii_softc *);

/*
 * Some 3Com internal PHYs report zero for OUI and model, others use
 * actual values.
 * Note that the 3Com internal PHYs having OUI 0x105a and model 0 are
 * handled fine by ukphy(4); they can be isolated and don't require
 * special treatment after reset.
 */
static const struct mii_phydesc exphys[] = {
	{ 0, 0, "3Com internal media interface" },
	MII_PHY_DESC(xxBROADCOM, 3C905C),
	MII_PHY_END
};

static const struct mii_phy_funcs exphy_funcs = {
	exphy_service,
	ukphy_status,
	exphy_reset
};

static int
exphy_probe(device_t dev)
{

	if (strcmp(device_get_name(device_get_parent(device_get_parent(dev))),
	    "xl") == 0)
		return (mii_phy_dev_probe(dev, exphys, BUS_PROBE_DEFAULT));
	return (ENXIO);
}

static int
exphy_attach(device_t dev)
{

	/*
	 * The 3Com PHY can never be isolated.
	 */
	mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE,
	    &exphy_funcs, 1);
	return (0);
}

static int
exphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{

	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);
		break;

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

		/*
		 * The 3Com PHY's autonegotiation doesn't need to be
		 * kicked; it continues in the background.
		 */
		break;
	}

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

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

static void
exphy_reset(struct mii_softc *sc)
{

	mii_phy_reset(sc);

	/*
	 * XXX 3Com PHY doesn't set the BMCR properly after
	 * XXX reset, which breaks autonegotiation.
	 */
	PHY_WRITE(sc, MII_BMCR, BMCR_S100|BMCR_AUTOEN|BMCR_FDX);
}