/*-
 * Copyright (c) 2001 Jonathan Lemon
 * 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. 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 THE AUTHOR 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 AUTHOR 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/inphy.c,v 1.14 2004/05/30 17:57:40 phk Exp $
 * $DragonFly: src/sys/dev/netif/mii_layer/inphy.c,v 1.8 2006/12/22 23:26:20 swildner Exp $
 */

/*
 * driver for Intel 82553 and 82555 PHYs
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/bus.h>

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

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

#include "inphyreg.h"

#include "miibus_if.h"

static int 	inphy_probe(device_t dev);
static int 	inphy_attach(device_t dev);
static int	inphy_service(struct mii_softc *, struct mii_data *, int);
static void	inphy_status(struct mii_softc *);

static device_method_t inphy_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		inphy_probe),
	DEVMETHOD(device_attach,	inphy_attach),
	DEVMETHOD(device_detach,	ukphy_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	{ 0, 0 }
};

static const struct mii_phydesc inphys[] = {
	MII_PHYDESC(xxINTEL,	I82553AB),	/* Intel 82553 A/B steppings */
	MII_PHYDESC(INTEL,	I82555),
	MII_PHYDESC(INTEL,	I82553C),
	MII_PHYDESC(INTEL,	I82562EM),
	MII_PHYDESC(INTEL,	I82562ET),
	MII_PHYDESC_NULL
};

static devclass_t inphy_devclass;

static driver_t inphy_driver = {
	"inphy",
	inphy_methods,
	sizeof(struct mii_softc)
};

DRIVER_MODULE(inphy, miibus, inphy_driver, inphy_devclass, 0, 0);

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

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

static int
inphy_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 = inphy_service;
	sc->mii_pdata = mii;
	mii->mii_instance++;

#if 0
	sc->mii_flags |= MIIF_NOISOLATE;
#endif

	ifmedia_add(&mii->mii_media,
	    IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst),
	    MII_MEDIA_100_TX, NULL);

	mii_phy_reset(sc);

	sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & ma->mii_capmask;

	device_printf(dev, " ");
	if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0)
		kprintf("no media present");
	else
		mii_phy_add_media(sc);
	kprintf("\n");

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

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

	switch (cmd) {
	case MII_POLLSTAT:
		if (IFM_INST(ife->ifm_media) != sc->mii_inst)
			return (0);
		break;

	case MII_MEDIACHG:
		if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
			reg = PHY_READ(sc, MII_BMCR);
			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_set_media(sc);
		break;

	case MII_TICK:
		if (IFM_INST(ife->ifm_media) != sc->mii_inst)
			return (0);

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

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

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

static void
inphy_status(struct mii_softc *sc)
{
	struct mii_data *mii = sc->mii_pdata;
	int bmsr, bmcr, scr;

	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) {
		if ((bmsr & BMSR_ACOMP) == 0) {
			mii->mii_media_active |= IFM_NONE;
			return;
		}

		scr = PHY_READ(sc, MII_INPHY_SCR);
		if ((bmsr & BMSR_100T4) && (scr & SCR_T4))
			mii->mii_media_active |= IFM_100_T4;
		else if (scr & SCR_S100)
			mii->mii_media_active |= IFM_100_TX;
		else
			mii->mii_media_active |= IFM_10_T;
		if (scr & SCR_FDX)
			mii->mii_media_active |= IFM_FDX;
	} else {
		mii->mii_media_active = mii->mii_media.ifm_cur->ifm_media;
	}
}