/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/mii.h: definitions for MII-compatible transceivers
 * Originally drivers/net/sunhme.h.
 *
 * Copyright (C) 1996, 1999, 2001 David S. Miller (davem@redhat.com)
 */
#ifndef __LINUX_MII_H__
#define __LINUX_MII_H__


#include <linux/if.h>
#include <linux/linkmode.h>
#include <uapi/linux/mii.h>

struct ethtool_cmd;

struct mii_if_info {
        int phy_id;
        int advertising;
        int phy_id_mask;
        int reg_num_mask;

        unsigned int full_duplex : 1;   /* is full duplex? */
        unsigned int force_media : 1;   /* is autoneg. disabled? */
        unsigned int supports_gmii : 1; /* are GMII registers supported? */

        struct net_device *dev;
        int (*mdio_read) (struct net_device *dev, int phy_id, int location);
        void (*mdio_write) (struct net_device *dev, int phy_id, int location, int val);
};

extern int mii_link_ok (struct mii_if_info *mii);
extern int mii_nway_restart (struct mii_if_info *mii);
extern void mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
extern void mii_ethtool_get_link_ksettings(
        struct mii_if_info *mii, struct ethtool_link_ksettings *cmd);
extern int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
extern int mii_ethtool_set_link_ksettings(
        struct mii_if_info *mii, const struct ethtool_link_ksettings *cmd);
extern int mii_check_gmii_support(struct mii_if_info *mii);
extern void mii_check_link (struct mii_if_info *mii);
extern unsigned int mii_check_media (struct mii_if_info *mii,
                                     unsigned int ok_to_print,
                                     unsigned int init_media);
extern int generic_mii_ioctl(struct mii_if_info *mii_if,
                             struct mii_ioctl_data *mii_data, int cmd,
                             unsigned int *duplex_changed);


static inline struct mii_ioctl_data *if_mii(struct ifreq *rq)
{
        return (struct mii_ioctl_data *) &rq->ifr_ifru;
}

/**
 * mii_nway_result
 * @negotiated: value of MII ANAR and'd with ANLPAR
 *
 * Given a set of MII abilities, check each bit and returns the
 * currently supported media, in the priority order defined by
 * IEEE 802.3u.  We use LPA_xxx constants but note this is not the
 * value of LPA solely, as described above.
 *
 * The one exception to IEEE 802.3u is that 100baseT4 is placed
 * between 100T-full and 100T-half.  If your phy does not support
 * 100T4 this is fine.  If your phy places 100T4 elsewhere in the
 * priority order, you will need to roll your own function.
 */
static inline unsigned int mii_nway_result (unsigned int negotiated)
{
        unsigned int ret;

        if (negotiated & LPA_100FULL)
                ret = LPA_100FULL;
        else if (negotiated & LPA_100BASE4)
                ret = LPA_100BASE4;
        else if (negotiated & LPA_100HALF)
                ret = LPA_100HALF;
        else if (negotiated & LPA_10FULL)
                ret = LPA_10FULL;
        else
                ret = LPA_10HALF;

        return ret;
}

/**
 * mii_duplex
 * @duplex_lock: Non-zero if duplex is locked at full
 * @negotiated: value of MII ANAR and'd with ANLPAR
 *
 * A small helper function for a common case.  Returns one
 * if the media is operating or locked at full duplex, and
 * returns zero otherwise.
 */
static inline unsigned int mii_duplex (unsigned int duplex_lock,
                                       unsigned int negotiated)
{
        if (duplex_lock)
                return 1;
        if (mii_nway_result(negotiated) & LPA_DUPLEX)
                return 1;
        return 0;
}

/**
 * ethtool_adv_to_mii_adv_t
 * @ethadv: the ethtool advertisement settings
 *
 * A small helper function that translates ethtool advertisement
 * settings to phy autonegotiation advertisements for the
 * MII_ADVERTISE register.
 */
static inline u32 ethtool_adv_to_mii_adv_t(u32 ethadv)
{
        u32 result = 0;

        if (ethadv & ADVERTISED_10baseT_Half)
                result |= ADVERTISE_10HALF;
        if (ethadv & ADVERTISED_10baseT_Full)
                result |= ADVERTISE_10FULL;
        if (ethadv & ADVERTISED_100baseT_Half)
                result |= ADVERTISE_100HALF;
        if (ethadv & ADVERTISED_100baseT_Full)
                result |= ADVERTISE_100FULL;
        if (ethadv & ADVERTISED_Pause)
                result |= ADVERTISE_PAUSE_CAP;
        if (ethadv & ADVERTISED_Asym_Pause)
                result |= ADVERTISE_PAUSE_ASYM;

        return result;
}

/**
 * linkmode_adv_to_mii_adv_t
 * @advertising: the linkmode advertisement settings
 *
 * A small helper function that translates linkmode advertisement
 * settings to phy autonegotiation advertisements for the
 * MII_ADVERTISE register.
 */
static inline u32 linkmode_adv_to_mii_adv_t(const unsigned long *advertising)
{
        u32 result = 0;

        if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, advertising))
                result |= ADVERTISE_10HALF;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, advertising))
                result |= ADVERTISE_10FULL;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, advertising))
                result |= ADVERTISE_100HALF;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, advertising))
                result |= ADVERTISE_100FULL;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising))
                result |= ADVERTISE_PAUSE_CAP;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, advertising))
                result |= ADVERTISE_PAUSE_ASYM;

        return result;
}

/**
 * mii_adv_to_ethtool_adv_t
 * @adv: value of the MII_ADVERTISE register
 *
 * A small helper function that translates MII_ADVERTISE bits
 * to ethtool advertisement settings.
 */
static inline u32 mii_adv_to_ethtool_adv_t(u32 adv)
{
        u32 result = 0;

        if (adv & ADVERTISE_10HALF)
                result |= ADVERTISED_10baseT_Half;
        if (adv & ADVERTISE_10FULL)
                result |= ADVERTISED_10baseT_Full;
        if (adv & ADVERTISE_100HALF)
                result |= ADVERTISED_100baseT_Half;
        if (adv & ADVERTISE_100FULL)
                result |= ADVERTISED_100baseT_Full;
        if (adv & ADVERTISE_PAUSE_CAP)
                result |= ADVERTISED_Pause;
        if (adv & ADVERTISE_PAUSE_ASYM)
                result |= ADVERTISED_Asym_Pause;

        return result;
}

/**
 * ethtool_adv_to_mii_ctrl1000_t
 * @ethadv: the ethtool advertisement settings
 *
 * A small helper function that translates ethtool advertisement
 * settings to phy autonegotiation advertisements for the
 * MII_CTRL1000 register when in 1000T mode.
 */
static inline u32 ethtool_adv_to_mii_ctrl1000_t(u32 ethadv)
{
        u32 result = 0;

        if (ethadv & ADVERTISED_1000baseT_Half)
                result |= ADVERTISE_1000HALF;
        if (ethadv & ADVERTISED_1000baseT_Full)
                result |= ADVERTISE_1000FULL;

        return result;
}

/**
 * linkmode_adv_to_mii_ctrl1000_t
 * @advertising: the linkmode advertisement settings
 *
 * A small helper function that translates linkmode advertisement
 * settings to phy autonegotiation advertisements for the
 * MII_CTRL1000 register when in 1000T mode.
 */
static inline u32
linkmode_adv_to_mii_ctrl1000_t(const unsigned long *advertising)
{
        u32 result = 0;

        if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
                              advertising))
                result |= ADVERTISE_1000HALF;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
                              advertising))
                result |= ADVERTISE_1000FULL;

        return result;
}

/**
 * mii_ctrl1000_to_ethtool_adv_t
 * @adv: value of the MII_CTRL1000 register
 *
 * A small helper function that translates MII_CTRL1000
 * bits, when in 1000Base-T mode, to ethtool
 * advertisement settings.
 */
static inline u32 mii_ctrl1000_to_ethtool_adv_t(u32 adv)
{
        u32 result = 0;

        if (adv & ADVERTISE_1000HALF)
                result |= ADVERTISED_1000baseT_Half;
        if (adv & ADVERTISE_1000FULL)
                result |= ADVERTISED_1000baseT_Full;

        return result;
}

/**
 * mii_lpa_to_ethtool_lpa_t
 * @adv: value of the MII_LPA register
 *
 * A small helper function that translates MII_LPA
 * bits, when in 1000Base-T mode, to ethtool
 * LP advertisement settings.
 */
static inline u32 mii_lpa_to_ethtool_lpa_t(u32 lpa)
{
        u32 result = 0;

        if (lpa & LPA_LPACK)
                result |= ADVERTISED_Autoneg;

        return result | mii_adv_to_ethtool_adv_t(lpa);
}

/**
 * mii_stat1000_to_ethtool_lpa_t
 * @adv: value of the MII_STAT1000 register
 *
 * A small helper function that translates MII_STAT1000
 * bits, when in 1000Base-T mode, to ethtool
 * advertisement settings.
 */
static inline u32 mii_stat1000_to_ethtool_lpa_t(u32 lpa)
{
        u32 result = 0;

        if (lpa & LPA_1000HALF)
                result |= ADVERTISED_1000baseT_Half;
        if (lpa & LPA_1000FULL)
                result |= ADVERTISED_1000baseT_Full;

        return result;
}

/**
 * mii_stat1000_mod_linkmode_lpa_t
 * @advertising: target the linkmode advertisement settings
 * @adv: value of the MII_STAT1000 register
 *
 * A small helper function that translates MII_STAT1000 bits, when in
 * 1000Base-T mode, to linkmode advertisement settings. Other bits in
 * advertising are not changes.
 */
static inline void mii_stat1000_mod_linkmode_lpa_t(unsigned long *advertising,
                                                   u32 lpa)
{
        linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
                         advertising, lpa & LPA_1000HALF);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
                         advertising, lpa & LPA_1000FULL);
}

/**
 * ethtool_adv_to_mii_adv_x
 * @ethadv: the ethtool advertisement settings
 *
 * A small helper function that translates ethtool advertisement
 * settings to phy autonegotiation advertisements for the
 * MII_CTRL1000 register when in 1000Base-X mode.
 */
static inline u32 ethtool_adv_to_mii_adv_x(u32 ethadv)
{
        u32 result = 0;

        if (ethadv & ADVERTISED_1000baseT_Half)
                result |= ADVERTISE_1000XHALF;
        if (ethadv & ADVERTISED_1000baseT_Full)
                result |= ADVERTISE_1000XFULL;
        if (ethadv & ADVERTISED_Pause)
                result |= ADVERTISE_1000XPAUSE;
        if (ethadv & ADVERTISED_Asym_Pause)
                result |= ADVERTISE_1000XPSE_ASYM;

        return result;
}

/**
 * mii_adv_to_ethtool_adv_x
 * @adv: value of the MII_CTRL1000 register
 *
 * A small helper function that translates MII_CTRL1000
 * bits, when in 1000Base-X mode, to ethtool
 * advertisement settings.
 */
static inline u32 mii_adv_to_ethtool_adv_x(u32 adv)
{
        u32 result = 0;

        if (adv & ADVERTISE_1000XHALF)
                result |= ADVERTISED_1000baseT_Half;
        if (adv & ADVERTISE_1000XFULL)
                result |= ADVERTISED_1000baseT_Full;
        if (adv & ADVERTISE_1000XPAUSE)
                result |= ADVERTISED_Pause;
        if (adv & ADVERTISE_1000XPSE_ASYM)
                result |= ADVERTISED_Asym_Pause;

        return result;
}

/**
 * mii_adv_mod_linkmode_adv_t
 * @advertising:pointer to destination link mode.
 * @adv: value of the MII_ADVERTISE register
 *
 * A small helper function that translates MII_ADVERTISE bits to
 * linkmode advertisement settings. Leaves other bits unchanged.
 */
static inline void mii_adv_mod_linkmode_adv_t(unsigned long *advertising,
                                              u32 adv)
{
        linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
                         advertising, adv & ADVERTISE_10HALF);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
                         advertising, adv & ADVERTISE_10FULL);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
                         advertising, adv & ADVERTISE_100HALF);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
                         advertising, adv & ADVERTISE_100FULL);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising,
                         adv & ADVERTISE_PAUSE_CAP);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                         advertising, adv & ADVERTISE_PAUSE_ASYM);
}

/**
 * mii_adv_to_linkmode_adv_t
 * @advertising:pointer to destination link mode.
 * @adv: value of the MII_ADVERTISE register
 *
 * A small helper function that translates MII_ADVERTISE bits
 * to linkmode advertisement settings. Clears the old value
 * of advertising.
 */
static inline void mii_adv_to_linkmode_adv_t(unsigned long *advertising,
                                             u32 adv)
{
        linkmode_zero(advertising);

        mii_adv_mod_linkmode_adv_t(advertising, adv);
}

/**
 * mii_lpa_to_linkmode_lpa_t
 * @adv: value of the MII_LPA register
 *
 * A small helper function that translates MII_LPA bits, when in
 * 1000Base-T mode, to linkmode LP advertisement settings. Clears the
 * old value of advertising
 */
static inline void mii_lpa_to_linkmode_lpa_t(unsigned long *lp_advertising,
                                             u32 lpa)
{
        mii_adv_to_linkmode_adv_t(lp_advertising, lpa);

        if (lpa & LPA_LPACK)
                linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
                                 lp_advertising);

}

/**
 * mii_lpa_mod_linkmode_lpa_t
 * @adv: value of the MII_LPA register
 *
 * A small helper function that translates MII_LPA bits, when in
 * 1000Base-T mode, to linkmode LP advertisement settings. Leaves
 * other bits unchanged.
 */
static inline void mii_lpa_mod_linkmode_lpa_t(unsigned long *lp_advertising,
                                              u32 lpa)
{
        mii_adv_mod_linkmode_adv_t(lp_advertising, lpa);

        linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
                         lp_advertising, lpa & LPA_LPACK);
}

static inline void mii_ctrl1000_mod_linkmode_adv_t(unsigned long *advertising,
                                                   u32 ctrl1000)
{
        linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, advertising,
                         ctrl1000 & ADVERTISE_1000HALF);
        linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, advertising,
                         ctrl1000 & ADVERTISE_1000FULL);
}

/**
 * linkmode_adv_to_lcl_adv_t
 * @advertising:pointer to linkmode advertising
 *
 * A small helper function that translates linkmode advertising to LVL
 * pause capabilities.
 */
static inline u32 linkmode_adv_to_lcl_adv_t(const unsigned long *advertising)
{
        u32 lcl_adv = 0;

        if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                              advertising))
                lcl_adv |= ADVERTISE_PAUSE_CAP;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                              advertising))
                lcl_adv |= ADVERTISE_PAUSE_ASYM;

        return lcl_adv;
}

/**
 * mii_lpa_mod_linkmode_x - decode the link partner's config_reg to linkmodes
 * @linkmodes: link modes array
 * @lpa: config_reg word from link partner
 * @fd_bit: link mode for 1000XFULL bit
 */
static inline void mii_lpa_mod_linkmode_x(unsigned long *linkmodes, u16 lpa,
                                         int fd_bit)
{
        linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, linkmodes,
                         lpa & LPA_LPACK);
        linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, linkmodes,
                         lpa & LPA_1000XPAUSE);
        linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, linkmodes,
                         lpa & LPA_1000XPAUSE_ASYM);
        linkmode_mod_bit(fd_bit, linkmodes,
                         lpa & LPA_1000XFULL);
}

/**
 * linkmode_adv_to_mii_adv_x - encode a linkmode to config_reg
 * @linkmodes: linkmodes
 * @fd_bit: full duplex bit
 */
static inline u16 linkmode_adv_to_mii_adv_x(const unsigned long *linkmodes,
                                            int fd_bit)
{
        u16 adv = 0;

        if (linkmode_test_bit(fd_bit, linkmodes))
                adv |= ADVERTISE_1000XFULL;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, linkmodes))
                adv |= ADVERTISE_1000XPAUSE;
        if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, linkmodes))
                adv |= ADVERTISE_1000XPSE_ASYM;

        return adv;
}

/**
 * mii_advertise_flowctrl - get flow control advertisement flags
 * @cap: Flow control capabilities (FLOW_CTRL_RX, FLOW_CTRL_TX or both)
 */
static inline u16 mii_advertise_flowctrl(int cap)
{
        u16 adv = 0;

        if (cap & FLOW_CTRL_RX)
                adv = ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
        if (cap & FLOW_CTRL_TX)
                adv ^= ADVERTISE_PAUSE_ASYM;

        return adv;
}

/**
 * mii_resolve_flowctrl_fdx
 * @lcladv: value of MII ADVERTISE register
 * @rmtadv: value of MII LPA register
 *
 * Resolve full duplex flow control as per IEEE 802.3-2005 table 28B-3
 */
static inline u8 mii_resolve_flowctrl_fdx(u16 lcladv, u16 rmtadv)
{
        u8 cap = 0;

        if (lcladv & rmtadv & ADVERTISE_PAUSE_CAP) {
                cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
        } else if (lcladv & rmtadv & ADVERTISE_PAUSE_ASYM) {
                if (lcladv & ADVERTISE_PAUSE_CAP)
                        cap = FLOW_CTRL_RX;
                else if (rmtadv & ADVERTISE_PAUSE_CAP)
                        cap = FLOW_CTRL_TX;
        }

        return cap;
}

/**
 * mii_bmcr_encode_fixed - encode fixed speed/duplex settings to a BMCR value
 * @speed: a SPEED_* value
 * @duplex: a DUPLEX_* value
 *
 * Encode the speed and duplex to a BMCR value. 2500, 1000, 100 and 10 Mbps are
 * supported. 2500Mbps is encoded to 1000Mbps. Other speeds are encoded as 10
 * Mbps. Unknown duplex values are encoded to half-duplex.
 */
static inline u16 mii_bmcr_encode_fixed(int speed, int duplex)
{
        u16 bmcr;

        switch (speed) {
        case SPEED_2500:
        case SPEED_1000:
                bmcr = BMCR_SPEED1000;
                break;

        case SPEED_100:
                bmcr = BMCR_SPEED100;
                break;

        case SPEED_10:
        default:
                bmcr = BMCR_SPEED10;
                break;
        }

        if (duplex == DUPLEX_FULL)
                bmcr |= BMCR_FULLDPLX;

        return bmcr;
}

#endif /* __LINUX_MII_H__ */