/*	$NetBSD: acphy.c,v 1.16 2006/03/29 07:05:24 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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.
 *
 * $FreeBSD: src/sys/dev/mii/acphy.c,v 1.2.2.2 2002/10/21 21:20:19 semenu Exp $
 */
 
/*
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Manuel Bouyer.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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 Altima AC101 10/100 PHY
 */

#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_var.h>
#include <net/if_media.h>

#include "mii.h"
#include "miivar.h"
#include "miidevs.h"

#include "acphyreg.h"

#include "miibus_if.h"

static int acphy_probe		(device_t);
static int acphy_attach		(device_t);

static device_method_t acphy_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		acphy_probe),
	DEVMETHOD(device_attach,	acphy_attach),
	DEVMETHOD(device_detach,	ukphy_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD_END
};

static const struct mii_phydesc acphys[] = {
	MII_PHYDESC(xxALTIMA,	AC101),
	MII_PHYDESC(xxALTIMA,	AC101L),
	MII_PHYDESC(xxALTIMA,	AC_UNKNOWN),
	MII_PHYDESC(xxALTIMA,	Am79C875),
	MII_PHYDESC_NULL
};

static devclass_t acphy_devclass;

static driver_t acphy_driver = {
	"acphy",
	acphy_methods,
	sizeof(struct mii_softc)
};

DRIVER_MODULE(acphy, miibus, acphy_driver, acphy_devclass, NULL, NULL);

static int	acphy_service(struct mii_softc *, struct mii_data *, int);
static void	acphy_reset(struct mii_softc *);
static void	acphy_status(struct mii_softc *);

static int
acphy_probe(device_t dev)
{
	struct mii_attach_args *ma = device_get_ivars(dev);
	const struct mii_phydesc *mpd;

	mpd = mii_phy_match(ma, acphys);
	if (mpd != NULL) {
		device_set_desc(dev, mpd->mpd_name);
		return (0);
	}
	return (ENXIO);
}

static int
acphy_attach(device_t dev)
{
	struct mii_softc *sc;
	struct mii_attach_args *ma;
	struct mii_data *mii;

	sc = device_get_softc(dev);
	ma = device_get_ivars(dev);
	mii_softc_init(sc, ma);
	sc->mii_dev = device_get_parent(dev);
	mii = device_get_softc(sc->mii_dev);
	LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list);

	sc->mii_inst = mii->mii_instance;
	sc->mii_service = acphy_service;
	sc->mii_reset = acphy_reset;
	sc->mii_pdata = mii;
	sc->mii_flags |= MIIF_NOISOLATE;

	acphy_reset(sc);

	mii->mii_instance++;

	sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
	device_printf(dev, " ");
	if (sc->mii_capabilities & BMSR_MEDIAMASK)
		mii_phy_add_media(sc);
	else
		kprintf("no media present");
	kprintf("\n");

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

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

	/*
	 * If we're not selected, then do nothing, just isolate and power
	 * down, if changing media.
	 */
	if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
		if (cmd == MII_MEDIACHG) {
			reg = PHY_READ(sc, MII_BMCR);
			PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO | BMCR_PDOWN);
		}

		return (0);
	}

	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_set_media(sc);
		break;

	case MII_TICK:
		/*
		 * Is the interface even up?
		 */
		if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
			return (0);

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

		/*
		 * This PHY's autonegotiation doesn't need to be kicked.
		 */
		break;
	}

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

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

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

	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) {
		int diag;

		if ((bmsr & BMSR_ACOMP) == 0) {
			/* Erg, still trying, I guess... */
			mii->mii_media_active |= IFM_NONE;
			return;
		}

		diag = PHY_READ(sc, MII_ACPHY_DIAG);
		if (diag & AC_DIAG_SPEED)
			mii->mii_media_active |= IFM_100_TX;
		else
			mii->mii_media_active |= IFM_10_T;

		if (diag & AC_DIAG_DUPLEX)
			mii->mii_media_active |= IFM_FDX;
	} else {
		mii->mii_media_active = ife->ifm_media;
	}
}

static void
acphy_reset(struct mii_softc *sc)
{
	mii_phy_reset(sc);
	PHY_WRITE(sc, MII_ACPHY_INT, 0);
}