/*	$NetBSD: nsphy.c,v 1.18 1999/07/14 23:57:36 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.
 *
 * 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 National Semiconductor's DP83840A ethernet 10/100 PHY
 * Data Sheet available from www.national.com
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/errno.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 <dev/mii/nsphyreg.h>

#include "miibus_if.h"

static int nsphy_probe(device_t);
static int nsphy_attach(device_t);

static device_method_t nsphy_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		nsphy_probe),
	DEVMETHOD(device_attach,	nsphy_attach),
	DEVMETHOD(device_detach,	mii_phy_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD_END
};

static devclass_t nsphy_devclass;

static driver_t nsphy_driver = {
	"nsphy",
	nsphy_methods,
	sizeof(struct mii_softc)
};

DRIVER_MODULE(nsphy, miibus, nsphy_driver, nsphy_devclass, 0, 0);

static int	nsphy_service(struct mii_softc *, struct mii_data *, int);
static void	nsphy_status(struct mii_softc *);
static void	nsphy_reset(struct mii_softc *);

static const struct mii_phydesc nsphys[] = {
	MII_PHY_DESC(xxNATSEMI, DP83840),
	MII_PHY_END
};

static const struct mii_phy_funcs nsphy_funcs = {
	nsphy_service,
	nsphy_status,
	nsphy_reset
};

static int
nsphy_probe(device_t dev)
{

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

static int
nsphy_attach(device_t dev)
{
	const char *nic;
	u_int flags;

	nic = device_get_name(device_get_parent(device_get_parent(dev)));
	flags = MIIF_NOMANPAUSE;
	/*
	 * Am79C971 wedge when isolating all of their external PHYs.
	 */
	if (strcmp(nic, "pcn") == 0)
		flags |= MIIF_NOISOLATE;
	mii_phy_dev_attach(dev, flags, &nsphy_funcs, 1);
	return (0);
}

static int
nsphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
	int reg;

	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;

		reg = PHY_READ(sc, MII_NSPHY_PCR);

		/*
		 * Set up the PCR to use LED4 to indicate full-duplex
		 * in both 10baseT and 100baseTX modes.
		 */
		reg |= PCR_LED4MODE;

		/*
		 * Make sure Carrier Integrity Monitor function is
		 * disabled (normal for Node operation, but sometimes
		 * it's not set?!)
		 */
		reg |= PCR_CIMDIS;

		/*
		 * Make sure "force link good" is set to normal mode.
		 * It's only intended for debugging.
		 */
		reg |= PCR_FLINK100;

		/*
		 * Mystery bits which are supposedly `reserved',
		 * but we seem to need to set them when the PHY
		 * is connected to some interfaces:
		 *
		 * 0x0400 is needed for fxp
		 *        (Intel EtherExpress Pro 10+/100B, 82557 chip)
		 *        (nsphy with a DP83840 chip)
		 * 0x0100 may be needed for some other card
		 */
		reg |= 0x0100 | 0x0400;

		if (strcmp(mii->mii_ifp->if_dname, "fxp") == 0)
			PHY_WRITE(sc, MII_NSPHY_PCR, reg);

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

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

	bmsr = PHY_READ(sc, MII_BMSR) |
	    PHY_READ(sc, MII_BMSR);
	if (bmsr & BMSR_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 PAR 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;
		}

		/*
		 * Argh.  The PAR doesn't seem to indicate duplex mode
		 * properly!  Determine media based on link partner's
		 * advertised capabilities.
		 */
		if (PHY_READ(sc, MII_ANER) & ANER_LPAN) {
			anlpar = PHY_READ(sc, MII_ANAR) &
			    PHY_READ(sc, MII_ANLPAR);
			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 ((mii->mii_media_active & IFM_FDX) != 0)
				mii->mii_media_active |=
				    mii_phy_flowstatus(sc);
			return;
		}

		/*
		 * Link partner is not capable of autonegotiation.
		 * We will never be in full-duplex mode if this is
		 * the case, so reading the PAR is OK.
		 */
		par = PHY_READ(sc, MII_NSPHY_PAR);
		if (par & PAR_10)
			mii->mii_media_active |= IFM_10_T;
		else
			mii->mii_media_active |= IFM_100_TX;
		mii->mii_media_active |= IFM_HDX;
	} else
		mii->mii_media_active = ife->ifm_media;
}

static void
nsphy_reset(struct mii_softc *sc)
{
	struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
	int reg, i;

	if (sc->mii_flags & MIIF_NOISOLATE)
		reg = BMCR_RESET;
	else
		reg = BMCR_RESET | BMCR_ISO;
	PHY_WRITE(sc, MII_BMCR, reg);

	/*
	 * It is best to allow a little time for the reset to settle
	 * in before we start polling the BMCR again.  Notably, the
	 * DP83840A manuals state that there should be a 500us delay
	 * between asserting software reset and attempting MII serial
	 * operations.  Be conservative.
	 */
	DELAY(1000);

	/*
	 * Wait another 2s for it to complete.
	 * This is only a little overkill as under normal circumstances
	 * the PHY can take up to 1s to complete reset.
	 * This is also a bit odd because after a reset, the BMCR will
	 * clear the reset bit and simply reports 0 even though the reset
	 * is not yet complete.
	 */
	for (i = 0; i < 1000; i++) {
		reg = PHY_READ(sc, MII_BMCR);
		if (reg != 0 && (reg & BMCR_RESET) == 0)
			break;
		DELAY(2000);
	}

	if ((sc->mii_flags & MIIF_NOISOLATE) == 0) {
		if ((ife == NULL && sc->mii_inst != 0) ||
		    (ife != NULL && IFM_INST(ife->ifm_media) != sc->mii_inst))
			PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
	}
}
