/*
   * 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 <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 int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
  extern int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
  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;
  }
  
  /**
   * 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;
  }
  
  /**
   * 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;
  }
  
  /**
   * 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_lpa_to_ethtool_lpa_x
   * @adv: value of the MII_LPA register
   *
   * A small helper function that translates MII_LPA
   * bits, when in 1000Base-X mode, to ethtool
   * LP advertisement settings.
   */
  static inline u32 mii_lpa_to_ethtool_lpa_x(u32 lpa)
  {
  	u32 result = 0;
  
  	if (lpa & LPA_LPACK)
  		result |= ADVERTISED_Autoneg;
  
  	return result | mii_adv_to_ethtool_adv_x(lpa);
  }
  
  /**
   * 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;
  }
  
  #endif /* __LINUX_MII_H__ */