text: /*
   * 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/types.h>
  
  /* Generic MII registers. */
  
  #define MII_BMCR            0x00        /* Basic mode control register */
  #define MII_BMSR            0x01        /* Basic mode status register  */
  #define MII_PHYSID1         0x02        /* PHYS ID 1                   */
  #define MII_PHYSID2         0x03        /* PHYS ID 2                   */
  #define MII_ADVERTISE       0x04        /* Advertisement control reg   */
  #define MII_LPA             0x05        /* Link partner ability reg    */
  #define MII_EXPANSION       0x06        /* Expansion register          */
  #define MII_CTRL1000        0x09        /* 1000BASE-T control          */
  #define MII_STAT1000        0x0a        /* 1000BASE-T status           */
  #define MII_ESTATUS	    0x0f	/* Extended Status */
  #define MII_DCOUNTER        0x12        /* Disconnect counter          */
  #define MII_FCSCOUNTER      0x13        /* False carrier counter       */
  #define MII_NWAYTEST        0x14        /* N-way auto-neg test reg     */
  #define MII_RERRCOUNTER     0x15        /* Receive error counter       */
  #define MII_SREVISION       0x16        /* Silicon revision            */
  #define MII_RESV1           0x17        /* Reserved...                 */
  #define MII_LBRERROR        0x18        /* Lpback, rx, bypass error    */
  #define MII_PHYADDR         0x19        /* PHY address                 */
  #define MII_RESV2           0x1a        /* Reserved...                 */
  #define MII_TPISTATUS       0x1b        /* TPI status for 10mbps       */
  #define MII_NCONFIG         0x1c        /* Network interface config    */
  
  /* Basic mode control register. */
  #define BMCR_RESV               0x003f  /* Unused...                   */
  #define BMCR_SPEED1000		0x0040  /* MSB of Speed (1000)         */
  #define BMCR_CTST               0x0080  /* Collision test              */
  #define BMCR_FULLDPLX           0x0100  /* Full duplex                 */
  #define BMCR_ANRESTART          0x0200  /* Auto negotiation restart    */
  #define BMCR_ISOLATE            0x0400  /* Disconnect DP83840 from MII */
  #define BMCR_PDOWN              0x0800  /* Powerdown the DP83840       */
  #define BMCR_ANENABLE           0x1000  /* Enable auto negotiation     */
  #define BMCR_SPEED100           0x2000  /* Select 100Mbps              */
  #define BMCR_LOOPBACK           0x4000  /* TXD loopback bits           */
  #define BMCR_RESET              0x8000  /* Reset the DP83840           */
  
  /* Basic mode status register. */
  #define BMSR_ERCAP              0x0001  /* Ext-reg capability          */
  #define BMSR_JCD                0x0002  /* Jabber detected             */
  #define BMSR_LSTATUS            0x0004  /* Link status                 */
  #define BMSR_ANEGCAPABLE        0x0008  /* Able to do auto-negotiation */
  #define BMSR_RFAULT             0x0010  /* Remote fault detected       */
  #define BMSR_ANEGCOMPLETE       0x0020  /* Auto-negotiation complete   */
  #define BMSR_RESV               0x00c0  /* Unused...                   */
  #define BMSR_ESTATEN		0x0100	/* Extended Status in R15 */
  #define BMSR_100HALF2           0x0200  /* Can do 100BASE-T2 HDX */
  #define BMSR_100FULL2           0x0400  /* Can do 100BASE-T2 FDX */
  #define BMSR_10HALF             0x0800  /* Can do 10mbps, half-duplex  */
  #define BMSR_10FULL             0x1000  /* Can do 10mbps, full-duplex  */
  #define BMSR_100HALF            0x2000  /* Can do 100mbps, half-duplex */
  #define BMSR_100FULL            0x4000  /* Can do 100mbps, full-duplex */
  #define BMSR_100BASE4           0x8000  /* Can do 100mbps, 4k packets  */
  
  /* Advertisement control register. */
  #define ADVERTISE_SLCT          0x001f  /* Selector bits               */
  #define ADVERTISE_CSMA          0x0001  /* Only selector supported     */
  #define ADVERTISE_10HALF        0x0020  /* Try for 10mbps half-duplex  */
  #define ADVERTISE_1000XFULL     0x0020  /* Try for 1000BASE-X full-duplex */
  #define ADVERTISE_10FULL        0x0040  /* Try for 10mbps full-duplex  */
  #define ADVERTISE_1000XHALF     0x0040  /* Try for 1000BASE-X half-duplex */
  #define ADVERTISE_100HALF       0x0080  /* Try for 100mbps half-duplex */
  #define ADVERTISE_1000XPAUSE    0x0080  /* Try for 1000BASE-X pause    */
  #define ADVERTISE_100FULL       0x0100  /* Try for 100mbps full-duplex */
  #define ADVERTISE_1000XPSE_ASYM 0x0100  /* Try for 1000BASE-X asym pause */
  #define ADVERTISE_100BASE4      0x0200  /* Try for 100mbps 4k packets  */
  #define ADVERTISE_PAUSE_CAP     0x0400  /* Try for pause               */
  #define ADVERTISE_PAUSE_ASYM    0x0800  /* Try for asymetric pause     */
  #define ADVERTISE_RESV          0x1000  /* Unused...                   */
  #define ADVERTISE_RFAULT        0x2000  /* Say we can detect faults    */
  #define ADVERTISE_LPACK         0x4000  /* Ack link partners response  */
  #define ADVERTISE_NPAGE         0x8000  /* Next page bit               */
  
  #define ADVERTISE_FULL (ADVERTISE_100FULL | ADVERTISE_10FULL | \
  			ADVERTISE_CSMA)
  #define ADVERTISE_ALL (ADVERTISE_10HALF | ADVERTISE_10FULL | \
                         ADVERTISE_100HALF | ADVERTISE_100FULL)
  
  /* Link partner ability register. */
  #define LPA_SLCT                0x001f  /* Same as advertise selector  */
  #define LPA_10HALF              0x0020  /* Can do 10mbps half-duplex   */
  #define LPA_1000XFULL           0x0020  /* Can do 1000BASE-X full-duplex */
  #define LPA_10FULL              0x0040  /* Can do 10mbps full-duplex   */
  #define LPA_1000XHALF           0x0040  /* Can do 1000BASE-X half-duplex */
  #define LPA_100HALF             0x0080  /* Can do 100mbps half-duplex  */
  #define LPA_1000XPAUSE          0x0080  /* Can do 1000BASE-X pause     */
  #define LPA_100FULL             0x0100  /* Can do 100mbps full-duplex  */
  #define LPA_1000XPAUSE_ASYM     0x0100  /* Can do 1000BASE-X pause asym*/
  #define LPA_100BASE4            0x0200  /* Can do 100mbps 4k packets   */
  #define LPA_PAUSE_CAP           0x0400  /* Can pause                   */
  #define LPA_PAUSE_ASYM          0x0800  /* Can pause asymetrically     */
  #define LPA_RESV                0x1000  /* Unused...                   */
  #define LPA_RFAULT              0x2000  /* Link partner faulted        */
  #define LPA_LPACK               0x4000  /* Link partner acked us       */
  #define LPA_NPAGE               0x8000  /* Next page bit               */
  
  #define LPA_DUPLEX		(LPA_10FULL | LPA_100FULL)
  #define LPA_100			(LPA_100FULL | LPA_100HALF | LPA_100BASE4)
  
  /* Expansion register for auto-negotiation. */
  #define EXPANSION_NWAY          0x0001  /* Can do N-way auto-nego      */
  #define EXPANSION_LCWP          0x0002  /* Got new RX page code word   */
  #define EXPANSION_ENABLENPAGE   0x0004  /* This enables npage words    */
  #define EXPANSION_NPCAPABLE     0x0008  /* Link partner supports npage */
  #define EXPANSION_MFAULTS       0x0010  /* Multiple faults detected    */
  #define EXPANSION_RESV          0xffe0  /* Unused...                   */
  
  #define ESTATUS_1000_TFULL	0x2000	/* Can do 1000BT Full */
  #define ESTATUS_1000_THALF	0x1000	/* Can do 1000BT Half */
  
  /* N-way test register. */
  #define NWAYTEST_RESV1          0x00ff  /* Unused...                   */
  #define NWAYTEST_LOOPBACK       0x0100  /* Enable loopback for N-way   */
  #define NWAYTEST_RESV2          0xfe00  /* Unused...                   */
  
  /* 1000BASE-T Control register */
  #define ADVERTISE_1000FULL      0x0200  /* Advertise 1000BASE-T full duplex */
  #define ADVERTISE_1000HALF      0x0100  /* Advertise 1000BASE-T half duplex */
  
  /* 1000BASE-T Status register */
  #define LPA_1000LOCALRXOK       0x2000  /* Link partner local receiver status */
  #define LPA_1000REMRXOK         0x1000  /* Link partner remote receiver status */
  #define LPA_1000FULL            0x0800  /* Link partner 1000BASE-T full duplex */
  #define LPA_1000HALF            0x0400  /* Link partner 1000BASE-T half duplex */
  
  /* Flow control flags */
  #define FLOW_CTRL_TX		0x01
  #define FLOW_CTRL_RX		0x02
  
  /* This structure is used in all SIOCxMIIxxx ioctl calls */
  struct mii_ioctl_data {
  	__u16		phy_id;
  	__u16		reg_num;
  	__u16		val_in;
  	__u16		val_out;
  };
  
  #ifdef __KERNEL__ 
  
  #include <linux/if.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;
  }
  
  /**
   * 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 /* __KERNEL__ */
  #endif /* __LINUX_MII_H__ */
  