/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 2001 Wind River Systems
 * Copyright (c) 2001
 *	Bill Paul <wpaul@bsdi.com>.  All rights reserved.
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
 * 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 the National Semiconductor DP83861, DP83865 and DP83891
 * 10/100/1000 PHYs.
 * Datasheet available at: http://www.national.com/ds/DP/DP83861.pdf
 * and at: http://www.national.com/ds/DP/DP83865.pdf
 *
 * The DP83891 is the older NS GigE PHY which isn't being sold
 * anymore.  The DP83861 is its replacement, which is an 'enhanced'
 * firmware driven component.  The major difference between the
 * two is that the DP83891 can't generate interrupts, while the
 * 83861 can (probably it wasn't originally designed to do this, but
 * it can now thanks to firmware updates).  The DP83861 also allows
 * access to its internal RAM via indirect register access.  The
 * DP83865 is an ultra low power version of the DP83861 and DP83891.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.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 <dev/mii/nsgphyreg.h>

#include "miibus_if.h"

static int nsgphy_probe(device_t);
static int nsgphy_attach(device_t);

static device_method_t nsgphy_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		nsgphy_probe),
	DEVMETHOD(device_attach,	nsgphy_attach),
	DEVMETHOD(device_detach,	mii_phy_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD_END
};

static devclass_t nsgphy_devclass;

static driver_t nsgphy_driver = {
	"nsgphy",
	nsgphy_methods,
	sizeof(struct mii_softc)
};

DRIVER_MODULE(nsgphy, miibus, nsgphy_driver, nsgphy_devclass, 0, 0);

static int	nsgphy_service(struct mii_softc *, struct mii_data *,int);
static void	nsgphy_status(struct mii_softc *);

static const struct mii_phydesc nsgphys[] = {
	MII_PHY_DESC(xxNATSEMI, DP83861),
	MII_PHY_DESC(xxNATSEMI, DP83865),
	MII_PHY_DESC(xxNATSEMI, DP83891),
	MII_PHY_END
};

static const struct mii_phy_funcs nsgphy_funcs = {
	nsgphy_service,
	nsgphy_status,
	mii_phy_reset
};

static int
nsgphy_probe(device_t dev)
{

	return (mii_phy_dev_probe(dev, nsgphys, BUS_PROBE_DEFAULT));
}

static int
nsgphy_attach(device_t dev)
{
	struct mii_softc *sc;

	sc = device_get_softc(dev);

	mii_phy_dev_attach(dev, MIIF_NOMANPAUSE, &nsgphy_funcs, 0);

	PHY_RESET(sc);

	/*
	 * NB: the PHY has the 10BASE-T BMSR bits hard-wired to 0,
	 * even though it supports 10BASE-T.
	 */
	sc->mii_capabilities = (PHY_READ(sc, MII_BMSR) |
	    BMSR_10TFDX | BMSR_10THDX) & sc->mii_capmask;
	/*
	 * Note that as documented manual 1000BASE-T modes of DP83865 only
	 * work together with other National Semiconductor PHYs.
	 */
	if (sc->mii_capabilities & BMSR_EXTSTAT)
		sc->mii_extcapabilities = PHY_READ(sc, MII_EXTSR);

	mii_phy_add_media(sc);
	printf("\n");

	MIIBUS_MEDIAINIT(sc->mii_dev);
	return (0);
}

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

	switch (cmd) {
	case MII_POLLSTAT:
		break;

	case MII_MEDIACHG:
		mii_phy_setmedia(sc);
		break;

	case MII_TICK:
		if (mii_phy_tick(sc) == EJUSTRETURN)
			return (0);
		break;
	}

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

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

static void
nsgphy_status(struct mii_softc *sc)
{
	struct mii_data *mii = sc->mii_pdata;
	struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
	int bmsr, bmcr, physup, gtsr;

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

	bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);

	physup = PHY_READ(sc, NSGPHY_MII_PHYSUP);

	if (physup & PHY_SUP_LINK)
		mii->mii_media_status |= IFM_ACTIVE;

	bmcr = PHY_READ(sc, 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) {
		/*
		 * 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;
		}

		switch (physup & (PHY_SUP_SPEED1 | PHY_SUP_SPEED0)) {
		case PHY_SUP_SPEED1:
			mii->mii_media_active |= IFM_1000_T;
			gtsr = PHY_READ(sc, MII_100T2SR);
			if (gtsr & GTSR_MS_RES)
				mii->mii_media_active |= IFM_ETH_MASTER;
			break;

		case PHY_SUP_SPEED0:
			mii->mii_media_active |= IFM_100_TX;
			break;

		case 0:
			mii->mii_media_active |= IFM_10_T;
			break;

		default:
			mii->mii_media_active |= IFM_NONE;
			mii->mii_media_status = 0;
			return;
		}

		if (physup & PHY_SUP_DUPLEX)
			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;
}