#include <machine/rtems-bsd-kernel-space.h>

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1997, 1998, 1999
 *	Bill Paul <wpaul@ee.columbia.edu>.  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>
__FBSDID("$FreeBSD$");

/*
 * Pseudo-driver for internal NWAY support on DEC 21143 and workalike
 * controllers.  Technically we're abusing the miibus code to handle
 * media selection and NWAY support here since there is no MII
 * interface.  However the logical operations are roughly the same,
 * and the alternative is to create a fake MII interface in the driver,
 * which is harder to do.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/bus.h>

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

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <rtems/bsd/local/miidevs.h>

#include <machine/bus.h>
#include <machine/resource.h>

#include <dev/pci/pcivar.h>

#include <dev/dc/if_dcreg.h>

#include <rtems/bsd/local/miibus_if.h>

#define DC_SETBIT(sc, reg, x)                           \
        CSR_WRITE_4(sc, reg,                            \
                CSR_READ_4(sc, reg) | x)

#define DC_CLRBIT(sc, reg, x)                           \
        CSR_WRITE_4(sc, reg,                            \
                CSR_READ_4(sc, reg) & ~x)

#define MIIF_AUTOTIMEOUT	0x0004

/*
 * This is the subsystem ID for the built-in 21143 ethernet
 * in several Compaq Presario systems.  Apparently these are
 * 10Mbps only, so we need to treat them specially.
 */
#define COMPAQ_PRESARIO_ID	0xb0bb0e11

static int dcphy_probe(device_t);
static int dcphy_attach(device_t);

static device_method_t dcphy_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		dcphy_probe),
	DEVMETHOD(device_attach,	dcphy_attach),
	DEVMETHOD(device_detach,	mii_phy_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD_END
};

static devclass_t dcphy_devclass;

static driver_t dcphy_driver = {
	"dcphy",
	dcphy_methods,
	sizeof(struct mii_softc)
};

DRIVER_MODULE(dcphy, miibus, dcphy_driver, dcphy_devclass, 0, 0);

static int	dcphy_service(struct mii_softc *, struct mii_data *, int);
static void	dcphy_status(struct mii_softc *);
static void	dcphy_reset(struct mii_softc *);
static int	dcphy_auto(struct mii_softc *);

static const struct mii_phy_funcs dcphy_funcs = {
	dcphy_service,
	dcphy_status,
	dcphy_reset
};

static int
dcphy_probe(device_t dev)
{
	struct mii_attach_args *ma;

	ma = device_get_ivars(dev);

	/*
	 * The dc driver will report the 21143 vendor and device
	 * ID to let us know that it wants us to attach.
	 */
	if (ma->mii_id1 != DC_VENDORID_DEC ||
	    ma->mii_id2 != DC_DEVICEID_21143)
		return (ENXIO);

	device_set_desc(dev, "Intel 21143 NWAY media interface");

	return (BUS_PROBE_DEFAULT);
}

static int
dcphy_attach(device_t dev)
{
	struct mii_softc *sc;
	struct dc_softc		*dc_sc;
	device_t brdev;

	sc = device_get_softc(dev);

	mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE,
	    &dcphy_funcs, 0);

	/*PHY_RESET(sc);*/
	dc_sc = if_getsoftc(sc->mii_pdata->mii_ifp);
	CSR_WRITE_4(dc_sc, DC_10BTSTAT, 0);
	CSR_WRITE_4(dc_sc, DC_10BTCTRL, 0);

	brdev = device_get_parent(sc->mii_dev);
	switch (pci_get_subdevice(brdev) << 16 | pci_get_subvendor(brdev)) {
	case COMPAQ_PRESARIO_ID:
		/* Example of how to only allow 10Mbps modes. */
		sc->mii_capabilities = BMSR_ANEG | BMSR_10TFDX | BMSR_10THDX;
		break;
	default:
		if (dc_sc->dc_pmode == DC_PMODE_SIA)
			sc->mii_capabilities =
			    BMSR_ANEG | BMSR_10TFDX | BMSR_10THDX;
		else
			sc->mii_capabilities =
			    BMSR_ANEG | BMSR_100TXFDX | BMSR_100TXHDX |
			    BMSR_10TFDX | BMSR_10THDX;
		break;
	}

	sc->mii_capabilities &= sc->mii_capmask;
	device_printf(dev, " ");
	mii_phy_add_media(sc);
	printf("\n");

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

static int
dcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
	struct dc_softc		*dc_sc;
	struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
	int reg;
	u_int32_t		mode;

	dc_sc = if_getsoftc(mii->mii_ifp);

	switch (cmd) {
	case MII_POLLSTAT:
		break;

	case MII_MEDIACHG:
		/*
		 * If the interface is not up, don't do anything.
		 */
		if ((if_getflags(mii->mii_ifp) & IFF_UP) == 0)
			break;

		mii->mii_media_active = IFM_NONE;
		mode = CSR_READ_4(dc_sc, DC_NETCFG);
		mode &= ~(DC_NETCFG_FULLDUPLEX | DC_NETCFG_PORTSEL |
		    DC_NETCFG_PCS | DC_NETCFG_SCRAMBLER | DC_NETCFG_SPEEDSEL);

		switch (IFM_SUBTYPE(ife->ifm_media)) {
		case IFM_AUTO:
			/*PHY_RESET(sc);*/
			(void)dcphy_auto(sc);
			break;
		case IFM_100_TX:
			PHY_RESET(sc);
			DC_CLRBIT(dc_sc, DC_10BTCTRL, DC_TCTL_AUTONEGENBL);
			mode |= DC_NETCFG_PORTSEL | DC_NETCFG_PCS |
			    DC_NETCFG_SCRAMBLER;
			if ((ife->ifm_media & IFM_FDX) != 0)
				mode |= DC_NETCFG_FULLDUPLEX;
			else
				mode &= ~DC_NETCFG_FULLDUPLEX;
			CSR_WRITE_4(dc_sc, DC_NETCFG, mode);
			break;
		case IFM_10_T:
			DC_CLRBIT(dc_sc, DC_SIARESET, DC_SIA_RESET);
			DC_CLRBIT(dc_sc, DC_10BTCTRL, 0xFFFF);
			if ((ife->ifm_media & IFM_FDX) != 0)
				DC_SETBIT(dc_sc, DC_10BTCTRL, 0x7F3D);
			else
				DC_SETBIT(dc_sc, DC_10BTCTRL, 0x7F3F);
			DC_SETBIT(dc_sc, DC_SIARESET, DC_SIA_RESET);
			DC_CLRBIT(dc_sc, DC_10BTCTRL, DC_TCTL_AUTONEGENBL);
			mode &= ~DC_NETCFG_PORTSEL;
			mode |= DC_NETCFG_SPEEDSEL;
			if ((ife->ifm_media & IFM_FDX) != 0)
				mode |= DC_NETCFG_FULLDUPLEX;
			else
				mode &= ~DC_NETCFG_FULLDUPLEX;
			CSR_WRITE_4(dc_sc, DC_NETCFG, mode);
			break;
		default:
			return (EINVAL);
		}
		break;

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

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

		reg = CSR_READ_4(dc_sc, DC_10BTSTAT);
		if (!(reg & DC_TSTAT_LS10) || !(reg & DC_TSTAT_LS100))
			break;

                /*
                 * Only retry autonegotiation every 5 seconds.
		 *
		 * Otherwise, fall through to calling dcphy_status()
		 * since real Intel 21143 chips don't show valid link
		 * status until autonegotiation is switched off, and
		 * that only happens in dcphy_status().  Without this,
		 * successful autonegotiation is never recognised on
		 * these chips.
                 */
                if (++sc->mii_ticks <= 50)
			break;

		sc->mii_ticks = 0;
		dcphy_auto(sc);

		break;
	}

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

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

static void
dcphy_status(struct mii_softc *sc)
{
	struct mii_data *mii = sc->mii_pdata;
	int anlpar, tstat;
	struct dc_softc		*dc_sc;

	dc_sc = if_getsoftc(mii->mii_ifp);

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

	if ((if_getflags(mii->mii_ifp) & IFF_UP) == 0)
		return;

	tstat = CSR_READ_4(dc_sc, DC_10BTSTAT);
	if (!(tstat & DC_TSTAT_LS10) || !(tstat & DC_TSTAT_LS100))
		mii->mii_media_status |= IFM_ACTIVE;

	if (CSR_READ_4(dc_sc, DC_10BTCTRL) & DC_TCTL_AUTONEGENBL) {
		/* Erg, still trying, I guess... */
		if ((tstat & DC_TSTAT_ANEGSTAT) != DC_ASTAT_AUTONEGCMP) {
			if ((DC_IS_MACRONIX(dc_sc) || DC_IS_PNICII(dc_sc)) &&
			    (tstat & DC_TSTAT_ANEGSTAT) == DC_ASTAT_DISABLE)
				goto skip;
			mii->mii_media_active |= IFM_NONE;
			return;
		}

		if (tstat & DC_TSTAT_LP_CAN_NWAY) {
			anlpar = tstat >> 16;
			if (anlpar & ANLPAR_TX_FD &&
			    sc->mii_capabilities & BMSR_100TXFDX)
				mii->mii_media_active |= IFM_100_TX | IFM_FDX;
			else if (anlpar & ANLPAR_T4 &&
			    sc->mii_capabilities & BMSR_100T4)
				mii->mii_media_active |= IFM_100_T4 | IFM_HDX;
			else if (anlpar & ANLPAR_TX &&
			    sc->mii_capabilities & BMSR_100TXHDX)
				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 (DC_IS_INTEL(dc_sc))
				DC_CLRBIT(dc_sc, DC_10BTCTRL,
				    DC_TCTL_AUTONEGENBL);
			return;
		}

		/*
		 * If the other side doesn't support NWAY, then the
		 * best we can do is determine if we have a 10Mbps or
		 * 100Mbps link.  There's no way to know if the link
		 * is full or half duplex, so we default to half duplex
		 * and hope that the user is clever enough to manually
		 * change the media settings if we're wrong.
		 */
		if (!(tstat & DC_TSTAT_LS100))
			mii->mii_media_active |= IFM_100_TX | IFM_HDX;
		else if (!(tstat & DC_TSTAT_LS10))
			mii->mii_media_active |= IFM_10_T | IFM_HDX;
		else
			mii->mii_media_active |= IFM_NONE;
		if (DC_IS_INTEL(dc_sc))
			DC_CLRBIT(dc_sc, DC_10BTCTRL, DC_TCTL_AUTONEGENBL);
		return;
	}

skip:
	if (CSR_READ_4(dc_sc, DC_NETCFG) & DC_NETCFG_SPEEDSEL)
		mii->mii_media_active |= IFM_10_T;
	else
		mii->mii_media_active |= IFM_100_TX;
	if (CSR_READ_4(dc_sc, DC_NETCFG) & DC_NETCFG_FULLDUPLEX)
		mii->mii_media_active |= IFM_FDX;
	else
		mii->mii_media_active |= IFM_HDX;
}

static int
dcphy_auto(struct mii_softc *mii)
{
	struct dc_softc		*sc;

	sc = if_getsoftc(mii->mii_pdata->mii_ifp);

	DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
	DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_FULLDUPLEX);
	DC_CLRBIT(sc, DC_SIARESET, DC_SIA_RESET);
	if (mii->mii_capabilities & BMSR_100TXHDX)
		CSR_WRITE_4(sc, DC_10BTCTRL, 0x3FFFF);
	else
		CSR_WRITE_4(sc, DC_10BTCTRL, 0xFFFF);
	DC_SETBIT(sc, DC_SIARESET, DC_SIA_RESET);
	DC_SETBIT(sc, DC_10BTCTRL, DC_TCTL_AUTONEGENBL);
	DC_SETBIT(sc, DC_10BTSTAT, DC_ASTAT_TXDISABLE);

	return (EJUSTRETURN);
}

static void
dcphy_reset(struct mii_softc *mii)
{
	struct dc_softc		*sc;

	sc = if_getsoftc(mii->mii_pdata->mii_ifp);

	DC_CLRBIT(sc, DC_SIARESET, DC_SIA_RESET);
	DELAY(1000);
	DC_SETBIT(sc, DC_SIARESET, DC_SIA_RESET);
}
