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__
  
  /* 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_XFULL	0x8000	/* Can do 1000BX Full */
  #define ESTATUS_1000_XHALF	0x4000	/* Can do 1000BX Half */
  #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
  
  /**
   * 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;
  }
  
  #endif /* __LINUX_MII_H__ */
  