NetBSD/sys/dev/mii/gentbi.c

/*	$NetBSD: gentbi.c,v 1.32 2021/06/29 21:03:36 pgoyette Exp $	*/

/*-
 * Copyright (c) 1998, 1999, 2000, 2001 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.
 *
 * 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 generic ten-bit (1000BASE-SX) interfaces, built into
 * many Gigabit Ethernet chips.
 *
 * All we have to do here is correctly report speed and duplex.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: gentbi.c,v 1.32 2021/06/29 21:03:36 pgoyette Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/socket.h>
#include <sys/errno.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	gentbimatch(device_t, cfdata_t, void *);
static void	gentbiattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(gentbi, sizeof(struct mii_softc),
    gentbimatch, gentbiattach, mii_phy_detach, mii_phy_activate);

static int	gentbi_service(struct mii_softc *, struct mii_data *, int);
static void	gentbi_status(struct mii_softc *);

static const struct mii_phy_funcs gentbi_funcs = {
	gentbi_service, gentbi_status, mii_phy_reset,
};

static int
gentbimatch(device_t parent, cfdata_t match, void *aux)
{
	struct mii_attach_args *ma = aux;
	struct mii_data *mii = ma->mii_data;
	int rv;
	uint16_t bmsr, extsr;

	/*
	 * We match as a generic TBI if:
	 *
	 *	- There is no media in the BMSR.
	 *	- EXTSR has only 1000X.
	 */
	mii_lock(mii);
	rv = (*mii->mii_readreg)(parent, ma->mii_phyno, MII_BMSR, &bmsr);
	if ((rv != 0)
	    || (bmsr & BMSR_EXTSTAT) == 0 || (bmsr & BMSR_MEDIAMASK) != 0) {
		mii_unlock(mii);
		return 0;
	}

	rv = (*mii->mii_readreg)(parent, ma->mii_phyno, MII_EXTSR, &extsr);
	if ((rv != 0) || ((extsr & (EXTSR_1000TFDX | EXTSR_1000THDX)) != 0)) {
		mii_unlock(mii);
		return 0;
	}
	mii_unlock(mii);

	if (extsr & (EXTSR_1000XFDX | EXTSR_1000XHDX)) {
		/*
		 * We think this is a generic TBI.  Return a match
		 * priority higher than ukphy, but lower than what
		 * specific drivers will return.
		 */
		return 2;
	}

	return 0;
}

static void
gentbiattach(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;
	int oui = MII_OUI(ma->mii_id1, ma->mii_id2);
	int model = MII_MODEL(ma->mii_id2);
	int rev = MII_REV(ma->mii_id2);
	char descr[MII_MAX_DESCR_LEN];

	mii_get_descr(descr, sizeof(descr), oui, model);
	if (descr[0])
		aprint_normal(": %s (OUI 0x%06x, model 0x%04x), rev. %d\n",
		    descr, oui, model, rev);
	else
		aprint_normal(": OUI 0x%06x, model 0x%04x, rev. %d\n",
		    oui, model, rev);

	aprint_naive(": Generic ten-bit interface\n");

	sc->mii_dev = self;
	sc->mii_inst = mii->mii_instance;
	sc->mii_phy = ma->mii_phyno;
	sc->mii_mpd_oui = oui;
	sc->mii_mpd_model = model;
	sc->mii_mpd_rev = rev;
	sc->mii_funcs = &gentbi_funcs;
	sc->mii_pdata = mii;
	sc->mii_flags = ma->mii_flags;

	mii_lock(mii);

	PHY_RESET(sc);

	/*
	 * Mask out all media in the BMSR.  We only are really interested
	 * in "auto".
	 */
	PHY_READ(sc, MII_BMSR, &sc->mii_capabilities);
	sc->mii_capabilities =
	    sc->mii_capabilities & ma->mii_capmask & ~BMSR_MEDIAMASK;
	if (sc->mii_capabilities & BMSR_EXTSTAT)
		PHY_READ(sc, MII_EXTSR, &sc->mii_extcapabilities);

	mii_unlock(mii);

	mii_phy_add_media(sc);
}

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

	KASSERT(mii_locked(mii));

	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 media indicates a different PHY instance,
		 * isolate ourselves.
		 */
		if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
			PHY_READ(sc, MII_BMCR, &reg);
			PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
			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;

		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
gentbi_status(struct mii_softc *sc)
{
	struct mii_data *mii = sc->mii_pdata;
	struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
	uint16_t bmsr, bmcr, anlpar;

	KASSERT(mii_locked(mii));

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

	PHY_READ(sc, MII_BMSR, &bmsr);
	PHY_READ(sc, MII_BMSR, &bmsr);

	if (bmsr & BMSR_LINK)
		mii->mii_media_status |= IFM_ACTIVE;

	PHY_READ(sc, MII_BMCR, &bmcr);
	if (bmcr & BMCR_ISO) {
		mii->mii_media_active |= IFM_NONE;
		mii->mii_media_status = 0;
		return;
	}

	if (bmcr & BMCR_LOOP)
		mii->mii_media_active |= IFM_LOOP;

	if (bmcr & BMCR_AUTOEN) {
		/*
		 * The media status bits are only valid if autonegotiation
		 * has completed (or it's disabled).
		 */
		if ((bmsr & BMSR_ACOMP) == 0) {
			/* Erg, still trying, I guess... */
			mii->mii_media_active |= IFM_NONE;
			return;
		}

		/*
		 * The media is always 1000baseSX.  Check the ANLPAR to
		 * see if we're doing full-duplex.
		 */
		mii->mii_media_active |= IFM_1000_SX;

		PHY_READ(sc, MII_ANLPAR, &anlpar);
		if ((sc->mii_extcapabilities & EXTSR_1000XFDX) != 0 &&
		    (anlpar & ANLPAR_X_FD) != 0)
			mii->mii_media_active |=
			    IFM_FDX | mii_phy_flowstatus(sc);
		else
			mii->mii_media_active |= IFM_HDX;
	} else
		mii->mii_media_active = ife->ifm_media;
}