/*-
 * 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>
/*
 * 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 "miidevs.h"

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

#include <dev/pci/pcivar.h>

#include <dev/dc/if_dcreg.h>

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

DRIVER_MODULE(dcphy, miibus, dcphy_driver, 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);
}