/*	$NetBSD: rgephy.c,v 1.29 2010/07/18 03:00:39 jakllsch Exp $	*/

/*
 * Copyright (c) 2003
 *	Bill Paul <wpaul@windriver.com>.  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 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>
__KERNEL_RCSID(0, "$NetBSD: rgephy.c,v 1.29 2010/07/18 03:00:39 jakllsch Exp $");


/*
 * Driver for the RealTek 8169S/8110S internal 10/100/1000 PHY.
 */

#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>
#include <dev/mii/miidevs.h>

#include <dev/mii/rgephyreg.h>

#include <dev/ic/rtl81x9reg.h>

static int	rgephy_match(device_t, cfdata_t, void *);
static void	rgephy_attach(device_t, device_t, void *);

struct rgephy_softc {
	struct mii_softc mii_sc;
	int mii_revision;
};

CFATTACH_DECL_NEW(rgephy, sizeof(struct rgephy_softc),
    rgephy_match, rgephy_attach, mii_phy_detach, mii_phy_activate);


static int	rgephy_service(struct mii_softc *, struct mii_data *, int);
static void	rgephy_status(struct mii_softc *);
static int	rgephy_mii_phy_auto(struct mii_softc *);
static void	rgephy_reset(struct mii_softc *);
static void	rgephy_loop(struct mii_softc *);
static void	rgephy_load_dspcode(struct mii_softc *);

static const struct mii_phy_funcs rgephy_funcs = {
	rgephy_service, rgephy_status, rgephy_reset,
};

static const struct mii_phydesc rgephys[] = {
	{ MII_OUI_xxREALTEK,		MII_MODEL_xxREALTEK_RTL8169S,
	  MII_STR_xxREALTEK_RTL8169S },

	{ MII_OUI_REALTEK,		MII_MODEL_REALTEK_RTL8169S,
	  MII_STR_REALTEK_RTL8169S },

	{ 0,				0,
	  NULL }
};

static int
rgephy_match(device_t parent, cfdata_t match, void *aux)
{
	struct mii_attach_args *ma = aux;

	if (mii_phy_match(ma, rgephys) != NULL)
		return 10;

	return 0;
}

static void
rgephy_attach(device_t parent, device_t self, void *aux)
{
	struct rgephy_softc *rsc = device_private(self);
	struct mii_softc *sc = &rsc->mii_sc;
	struct mii_attach_args *ma = aux;
	struct mii_data *mii = ma->mii_data;
	const struct mii_phydesc *mpd;
	int rev;
	const char *sep = "";

	ma = aux;
	mii = ma->mii_data;

	rev = MII_REV(ma->mii_id2);
	mpd = mii_phy_match(ma, rgephys);
	aprint_naive(": Media interface\n");
	aprint_normal(": %s, rev. %d\n", mpd->mpd_name, rev);

	rsc->mii_revision = rev;

	sc->mii_dev = self;
	sc->mii_inst = mii->mii_instance;
	sc->mii_phy = ma->mii_phyno;
	sc->mii_pdata = mii;
	sc->mii_flags = mii->mii_flags;
	sc->mii_anegticks = MII_ANEGTICKS_GIGE;

	sc->mii_funcs = &rgephy_funcs;

#define	ADD(m, c)	ifmedia_add(&mii->mii_media, (m), (c), NULL)
#define	PRINT(n)	aprint_normal("%s%s", sep, (n)); sep = ", "

#ifdef __FreeBSD__
	ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst),
	    BMCR_LOOP|BMCR_S100);
#endif

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

	/*
	 * FreeBSD does not check EXSTAT, but instead adds gigabit
	 * media explicitly. Why?
	 */
	aprint_normal_dev(self, "");
	if (sc->mii_capabilities & BMSR_EXTSTAT) {
		sc->mii_extcapabilities = PHY_READ(sc, MII_EXTSR);
	}
	mii_phy_add_media(sc);

	/* rtl8169S does not report auto-sense; add manually.  */
	ADD(IFM_MAKEWORD(IFM_ETHER, IFM_AUTO, 0, sc->mii_inst), MII_NMEDIA);
	sep =", ";
	PRINT("auto");

#undef	ADD
#undef	PRINT

	rgephy_reset(sc);
	aprint_normal("\n");
}

static int
rgephy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
	struct rgephy_softc *rsc;
	struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
	int reg, speed, gig, anar;

	rsc = (struct rgephy_softc *)sc;

	switch (cmd) {
	case MII_POLLSTAT:
		/*
		 * If we're not polling our PHY instance, just return.
		 */
		if (IFM_INST(ife->ifm_media) != sc->mii_inst)
			return 0;
		break;

	case MII_MEDIACHG:
		/*
		 * If the media indicates a different PHY instance,
		 * isolate ourselves.
		 */
		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;

		rgephy_reset(sc);	/* XXX hardware bug work-around */

		anar = PHY_READ(sc, MII_ANAR);
		anar &= ~(ANAR_TX_FD | ANAR_TX | ANAR_10_FD | ANAR_10);

		switch (IFM_SUBTYPE(ife->ifm_media)) {
		case IFM_AUTO:
#ifdef foo
			/*
			 * If we're already in auto mode, just return.
			 */
			if (PHY_READ(sc, MII_BMCR) & BMCR_AUTOEN)
				return 0;
#endif
			(void)rgephy_mii_phy_auto(sc);
			break;
		case IFM_1000_T:
			speed = BMCR_S1000;
			goto setit;
		case IFM_100_TX:
			speed = BMCR_S100;
			anar |= ANAR_TX_FD | ANAR_TX;
			goto setit;
		case IFM_10_T:
			speed = BMCR_S10;
			anar |= ANAR_10_FD | ANAR_10;
 setit:
			rgephy_loop(sc);
			if ((ife->ifm_media & IFM_GMASK) == IFM_FDX) {
				speed |= BMCR_FDX;
				gig = GTCR_ADV_1000TFDX;
				anar &= ~(ANAR_TX | ANAR_10);
			} else {
				gig = GTCR_ADV_1000THDX;
				anar &= ~(ANAR_TX_FD | ANAR_10_FD);
			}

			if (IFM_SUBTYPE(ife->ifm_media) != IFM_1000_T) {
				PHY_WRITE(sc, MII_100T2CR, 0);
				PHY_WRITE(sc, MII_ANAR, anar);
				PHY_WRITE(sc, MII_BMCR, speed |
				    BMCR_AUTOEN | BMCR_STARTNEG);
				break;
			}

			/*
			 * When setting the link manually, one side must
			 * be the master and the other the slave. However
			 * ifmedia doesn't give us a good way to specify
			 * this, so we fake it by using one of the LINK
			 * flags. If LINK0 is set, we program the PHY to
			 * be a master, otherwise it's a slave.
			 */
			if ((mii->mii_ifp->if_flags & IFF_LINK0)) {
				PHY_WRITE(sc, MII_100T2CR,
				    gig|GTCR_MAN_MS|GTCR_ADV_MS);
			} else {
				PHY_WRITE(sc, MII_100T2CR, gig|GTCR_MAN_MS);
			}
			PHY_WRITE(sc, MII_BMCR, speed |
			    BMCR_AUTOEN | BMCR_STARTNEG);
			break;
		case IFM_NONE:
			PHY_WRITE(sc, MII_BMCR, BMCR_ISO|BMCR_PDOWN);
			break;
		case IFM_100_T4:
		default:
			return EINVAL;
		}
		break;

	case MII_TICK:
		/*
		 * If we're not currently selected, just return.
		 */
		if (IFM_INST(ife->ifm_media) != sc->mii_inst)
			return 0;

		/*
		 * 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;

		/*
		 * Check to see if we have link.  If we do, we don't
		 * need to restart the autonegotiation process.  Read
		 * the BMSR twice in case it's latched.
		 */
		if (rsc->mii_revision >= 2) {
			/* RTL8211B(L) */
			reg = PHY_READ(sc, RGEPHY_MII_SSR);
			if (reg & RGEPHY_SSR_LINK) {
				sc->mii_ticks = 0;
				break;
			}
		} else {
			reg = PHY_READ(sc, RTK_GMEDIASTAT);
			if ((reg & RTK_GMEDIASTAT_LINK) != 0) {
				sc->mii_ticks = 0;
				break;
			}
		}

		/* Announce link loss right after it happens. */
		if (sc->mii_ticks++ == 0)
			break;

		/* Only retry autonegotiation every mii_anegticks seconds. */
		if (sc->mii_ticks <= sc->mii_anegticks)
			return 0;

		sc->mii_ticks = 0;
		rgephy_mii_phy_auto(sc);
		break;
	}

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

	/*
	 * Callback if something changed. Note that we need to poke
	 * the DSP on the RealTek PHYs if the media changes.
	 *
	 */
	if (sc->mii_media_active != mii->mii_media_active ||
	    sc->mii_media_status != mii->mii_media_status ||
	    cmd == MII_MEDIACHG) {
		rgephy_load_dspcode(sc);
	}
	mii_phy_update(sc, cmd);
	return 0;
}

static void
rgephy_status(struct mii_softc *sc)
{
	struct rgephy_softc *rsc;
	struct mii_data *mii = sc->mii_pdata;
	int gstat, bmsr, bmcr;
	uint16_t ssr;

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

	rsc = (struct rgephy_softc *)sc;
	if (rsc->mii_revision >= 2) {
		ssr = PHY_READ(sc, RGEPHY_MII_SSR);
		if (ssr & RGEPHY_SSR_LINK)
			mii->mii_media_status |= IFM_ACTIVE;
	} else {
		gstat = PHY_READ(sc, RTK_GMEDIASTAT);
		if ((gstat & RTK_GMEDIASTAT_LINK) != 0)
			mii->mii_media_status |= IFM_ACTIVE;
	}

	bmsr = PHY_READ(sc, MII_BMSR);
	bmcr = PHY_READ(sc, MII_BMCR);

	if ((bmcr & BMCR_ISO) != 0) {
		mii->mii_media_active |= IFM_NONE;
		mii->mii_media_status = 0;
		return;
	}

	if ((bmcr & BMCR_LOOP) != 0)
		mii->mii_media_active |= IFM_LOOP;

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

	if (rsc->mii_revision >= 2) {
		ssr = PHY_READ(sc, RGEPHY_MII_SSR);
		switch (ssr & RGEPHY_SSR_SPD_MASK) {
		case RGEPHY_SSR_S1000:
			mii->mii_media_active |= IFM_1000_T;
			break;
		case RGEPHY_SSR_S100:
			mii->mii_media_active |= IFM_100_TX;
			break;
		case RGEPHY_SSR_S10:
			mii->mii_media_active |= IFM_10_T;
			break;
		default:
			mii->mii_media_active |= IFM_NONE;
			break;
		}
		if (ssr & RGEPHY_SSR_FDX)
			mii->mii_media_active |= mii_phy_flowstatus(sc) |
			    IFM_FDX;
		else
			mii->mii_media_active |= IFM_HDX;
	} else {
		gstat = PHY_READ(sc, RTK_GMEDIASTAT);
		if ((gstat & RTK_GMEDIASTAT_1000MBPS) != 0)
			mii->mii_media_active |= IFM_1000_T;
		else if ((gstat & RTK_GMEDIASTAT_100MBPS) != 0)
			mii->mii_media_active |= IFM_100_TX;
		else if ((gstat & RTK_GMEDIASTAT_10MBPS) != 0)
			mii->mii_media_active |= IFM_10_T;
		else
			mii->mii_media_active |= IFM_NONE;
		if ((gstat & RTK_GMEDIASTAT_FDX) != 0)
			mii->mii_media_active |= mii_phy_flowstatus(sc) |
			    IFM_FDX;
		else
			mii->mii_media_active |= IFM_HDX;
	}
}


static int
rgephy_mii_phy_auto(struct mii_softc *mii)
{
	int anar;

	rgephy_loop(mii);
	rgephy_reset(mii);

	anar = BMSR_MEDIA_TO_ANAR(mii->mii_capabilities) | ANAR_CSMA;
	if (mii->mii_flags & MIIF_DOPAUSE)
		anar |= ANAR_FC | ANAR_X_PAUSE_ASYM;

	PHY_WRITE(mii, MII_ANAR, anar);
	DELAY(1000);
	PHY_WRITE(mii, MII_100T2CR, GTCR_ADV_1000THDX | GTCR_ADV_1000TFDX);
	DELAY(1000);
	PHY_WRITE(mii, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
	DELAY(100);

	return EJUSTRETURN;
}

static void
rgephy_loop(struct mii_softc *sc)
{
	struct rgephy_softc *rsc;
	uint32_t bmsr;
	int i;

	rsc = (struct rgephy_softc *)sc;
	if (rsc->mii_revision < 2) {
		PHY_WRITE(sc, MII_BMCR, BMCR_PDOWN);
		DELAY(1000);
	}

	for (i = 0; i < 15000; i++) {
		bmsr = PHY_READ(sc, MII_BMSR);
		if ((bmsr & BMSR_LINK) == 0) {
#if 0
			device_printf(sc->mii_dev, "looped %d\n", i);
#endif
			break;
		}
		DELAY(10);
	}
}

#define PHY_SETBIT(x, y, z) \
	PHY_WRITE(x, y, (PHY_READ(x, y) | (z)))
#define PHY_CLRBIT(x, y, z) \
	PHY_WRITE(x, y, (PHY_READ(x, y) & ~(z)))

/*
 * Initialize RealTek PHY per the datasheet. The DSP in the PHYs of
 * existing revisions of the 8169S/8110S chips need to be tuned in
 * order to reliably negotiate a 1000Mbps link. This is only needed
 * for rev 0 and rev 1 of the PHY. Later versions work without
 * any fixups.
 */
static void
rgephy_load_dspcode(struct mii_softc *sc)
{
	struct rgephy_softc *rsc;
	int val;

	rsc = (struct rgephy_softc *)sc;
	if (rsc->mii_revision >= 2)
		return;

#if 1
	PHY_WRITE(sc, 31, 0x0001);
	PHY_WRITE(sc, 21, 0x1000);
	PHY_WRITE(sc, 24, 0x65C7);
	PHY_CLRBIT(sc, 4, 0x0800);
	val = PHY_READ(sc, 4) & 0xFFF;
	PHY_WRITE(sc, 4, val);
	PHY_WRITE(sc, 3, 0x00A1);
	PHY_WRITE(sc, 2, 0x0008);
	PHY_WRITE(sc, 1, 0x1020);
	PHY_WRITE(sc, 0, 0x1000);
	PHY_SETBIT(sc, 4, 0x0800);
	PHY_CLRBIT(sc, 4, 0x0800);
	val = (PHY_READ(sc, 4) & 0xFFF) | 0x7000;
	PHY_WRITE(sc, 4, val);
	PHY_WRITE(sc, 3, 0xFF41);
	PHY_WRITE(sc, 2, 0xDE60);
	PHY_WRITE(sc, 1, 0x0140);
	PHY_WRITE(sc, 0, 0x0077);
	val = (PHY_READ(sc, 4) & 0xFFF) | 0xA000;
	PHY_WRITE(sc, 4, val);
	PHY_WRITE(sc, 3, 0xDF01);
	PHY_WRITE(sc, 2, 0xDF20);
	PHY_WRITE(sc, 1, 0xFF95);
	PHY_WRITE(sc, 0, 0xFA00);
	val = (PHY_READ(sc, 4) & 0xFFF) | 0xB000;
	PHY_WRITE(sc, 4, val);
	PHY_WRITE(sc, 3, 0xFF41);
	PHY_WRITE(sc, 2, 0xDE20);
	PHY_WRITE(sc, 1, 0x0140);
	PHY_WRITE(sc, 0, 0x00BB);
	val = (PHY_READ(sc, 4) & 0xFFF) | 0xF000;
	PHY_WRITE(sc, 4, val);
	PHY_WRITE(sc, 3, 0xDF01);
	PHY_WRITE(sc, 2, 0xDF20);
	PHY_WRITE(sc, 1, 0xFF95);
	PHY_WRITE(sc, 0, 0xBF00);
	PHY_SETBIT(sc, 4, 0x0800);
	PHY_CLRBIT(sc, 4, 0x0800);
	PHY_WRITE(sc, 31, 0x0000);
#else
	(void)val;
	PHY_WRITE(sc, 0x1f, 0x0001);
	PHY_WRITE(sc, 0x15, 0x1000);
	PHY_WRITE(sc, 0x18, 0x65c7);
	PHY_WRITE(sc, 0x04, 0x0000);
	PHY_WRITE(sc, 0x03, 0x00a1);
	PHY_WRITE(sc, 0x02, 0x0008);
	PHY_WRITE(sc, 0x01, 0x1020);
	PHY_WRITE(sc, 0x00, 0x1000);
	PHY_WRITE(sc, 0x04, 0x0800);
	PHY_WRITE(sc, 0x04, 0x0000);
	PHY_WRITE(sc, 0x04, 0x7000);
	PHY_WRITE(sc, 0x03, 0xff41);
	PHY_WRITE(sc, 0x02, 0xde60);
	PHY_WRITE(sc, 0x01, 0x0140);
	PHY_WRITE(sc, 0x00, 0x0077);
	PHY_WRITE(sc, 0x04, 0x7800);
	PHY_WRITE(sc, 0x04, 0x7000);
	PHY_WRITE(sc, 0x04, 0xa000);
	PHY_WRITE(sc, 0x03, 0xdf01);
	PHY_WRITE(sc, 0x02, 0xdf20);
	PHY_WRITE(sc, 0x01, 0xff95);
	PHY_WRITE(sc, 0x00, 0xfa00);
	PHY_WRITE(sc, 0x04, 0xa800);
	PHY_WRITE(sc, 0x04, 0xa000);
	PHY_WRITE(sc, 0x04, 0xb000);
	PHY_WRITE(sc, 0x0e, 0xff41);
	PHY_WRITE(sc, 0x02, 0xde20);
	PHY_WRITE(sc, 0x01, 0x0140);
	PHY_WRITE(sc, 0x00, 0x00bb);
	PHY_WRITE(sc, 0x04, 0xb800);
	PHY_WRITE(sc, 0x04, 0xb000);
	PHY_WRITE(sc, 0x04, 0xf000);
	PHY_WRITE(sc, 0x03, 0xdf01);
	PHY_WRITE(sc, 0x02, 0xdf20);
	PHY_WRITE(sc, 0x01, 0xff95);
	PHY_WRITE(sc, 0x00, 0xbf00);
	PHY_WRITE(sc, 0x04, 0xf800);
	PHY_WRITE(sc, 0x04, 0xf000);
	PHY_WRITE(sc, 0x04, 0x0000);
	PHY_WRITE(sc, 0x1f, 0x0000);
	PHY_WRITE(sc, 0x0b, 0x0000);

#endif

	DELAY(40);
}

static void
rgephy_reset(struct mii_softc *sc)
{
	struct rgephy_softc *rsc;
	uint16_t ssr;

	mii_phy_reset(sc);
	DELAY(1000);

	rsc = (struct rgephy_softc *)sc;
	if (rsc->mii_revision < 2) {
		rgephy_load_dspcode(sc);
	} else if (rsc->mii_revision == 3) {
		/* RTL8211C(L) */
		ssr = PHY_READ(sc, RGEPHY_MII_SSR);
		if ((ssr & RGEPHY_SSR_ALDPS) != 0) {
			ssr &= ~RGEPHY_SSR_ALDPS;
			PHY_WRITE(sc, RGEPHY_MII_SSR, ssr);
		}
	} else {
		PHY_WRITE(sc, 0x1F, 0x0000);
		PHY_WRITE(sc, 0x0e, 0x0000);
	}

	/* Reset capabilities */
	/* Step1: write our capability */
	/* 10/100 capability */
	PHY_WRITE(sc, MII_ANAR,
	    ANAR_TX_FD | ANAR_TX | ANAR_10_FD | ANAR_10 | ANAR_CSMA);
	/* 1000 capability */
	PHY_WRITE(sc, MII_100T2CR, GTCR_ADV_1000TFDX | GTCR_ADV_1000THDX);

	/* Step2: Restart NWay */
	/* NWay enable and Restart NWay */
	PHY_WRITE(sc, MII_BMCR, BMCR_RESET | BMCR_AUTOEN | BMCR_STARTNEG);
}
