NetBSD/sys/dev/mii/exphy.c

/*	$NetBSD: exphy.c,v 1.58 2020/03/15 23:04:50 thorpej Exp $	*/

/*-
 * Copyright (c) 1998, 1999, 2000 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.
 */

/*
 * driver for 3Com internal PHYs
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: exphy.c,v 1.58 2020/03/15 23:04:50 thorpej 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>

static int	exphymatch(device_t, cfdata_t, void *);
static void	exphyattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(exphy, sizeof(struct mii_softc),
    exphymatch, exphyattach, mii_phy_detach, mii_phy_activate);

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

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

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

	/*
	 * Argh, 3Com PHY 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 `ex'.
	 */
	if (!device_is_a(parent, "ex"))
		return 0;

	return 10;
}

static void
exphyattach(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(": 3Com internal media interface\n");

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

	/*
	 * The 3Com PHY can never be isolated, so never allow non-zero
	 * instances!
	 */
	if (mii->mii_instance != 0) {
		aprint_error_dev(self,
		    "ignoring this PHY, non-zero instance\n");
		return;
	}
	sc->mii_flags |= MIIF_NOISOLATE;

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

	/* We can't isolate the 3Com PHY, so it has to be the only one! */
	if (IFM_INST(ife->ifm_media) != sc->mii_inst)
		panic("exphy_service: can't isolate 3Com PHY");

	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);
		break;

	case MII_TICK:
		/* Only used for autonegotiation. */
		if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
			break;

		if (mii_phy_tick(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
exphy_reset(struct mii_softc *sc)
{

	KASSERT(mii_locked(sc->mii_pdata));

	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);
}