/*	$NetBSD: ukphy_subr.c,v 1.13.20.1 2019/11/06 09:55:15 martin Exp $	*/

/*-
 * Copyright (c) 1998 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.
 */

/*
 * Subroutines shared by the ukphy driver and other PHY drivers.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ukphy_subr.c,v 1.13.20.1 2019/11/06 09:55:15 martin 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>

/*
 * Media status subroutine.  If a PHY driver does media detection simply
 * by decoding the NWay autonegotiation, use this routine.
 */
void
ukphy_status(struct mii_softc *phy)
{
	struct mii_data *mii = phy->mii_pdata;
	struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
	int bmsr, bmcr, anlpar, gtcr, gtsr;

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

	bmsr = PHY_READ(phy, MII_BMSR) | PHY_READ(phy, MII_BMSR);
	if (bmsr & BMSR_LINK)
		mii->mii_media_status |= IFM_ACTIVE;

	bmcr = PHY_READ(phy, MII_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) {
		/*
		 * NWay autonegotiation takes the highest-order common
		 * bit of the ANAR and ANLPAR (i.e. best media advertised
		 * both by us and our link partner).
		 */
		if ((bmsr & BMSR_ACOMP) == 0) {
			/* Erg, still trying, I guess... */
			mii->mii_media_active |= IFM_NONE;
			return;
		}

		anlpar = PHY_READ(phy, MII_ANAR) & PHY_READ(phy, MII_ANLPAR);
		if ((phy->mii_flags & MIIF_HAVE_GTCR) != 0 &&
		    (phy->mii_extcapabilities &
			(EXTSR_1000THDX | EXTSR_1000TFDX)) != 0) {
			gtcr = PHY_READ(phy, MII_100T2CR);
			gtsr = PHY_READ(phy, MII_100T2SR);
		} else
			gtcr = gtsr = 0;

		if ((gtcr & GTCR_ADV_1000TFDX) && (gtsr & GTSR_LP_1000TFDX))
			mii->mii_media_active |= IFM_1000_T|IFM_FDX;
		else if ((gtcr & GTCR_ADV_1000THDX) &&
			 (gtsr & GTSR_LP_1000THDX))
			mii->mii_media_active |= IFM_1000_T|IFM_HDX;
		else if (anlpar & ANLPAR_TX_FD)
			mii->mii_media_active |= IFM_100_TX|IFM_FDX;
		else if (anlpar & ANLPAR_T4)
			mii->mii_media_active |= IFM_100_T4|IFM_HDX;
		else if (anlpar & ANLPAR_TX)
			mii->mii_media_active |= IFM_100_TX|IFM_HDX;
		else if (anlpar & ANLPAR_10_FD)
			mii->mii_media_active |= IFM_10_T|IFM_FDX;
		else if (anlpar & ANLPAR_10)
			mii->mii_media_active |= IFM_10_T|IFM_HDX;
		else
			mii->mii_media_active |= IFM_NONE;

		if ((IFM_SUBTYPE(mii->mii_media_active) == IFM_1000_T) &&
		    (gtsr & GTSR_MS_RES))
			mii->mii_media_active |= IFM_ETH_MASTER;

		if (mii->mii_media_active & IFM_FDX)
			mii->mii_media_active |= mii_phy_flowstatus(phy);
	} else
		mii->mii_media_active = ife->ifm_media;
}