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-/*
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-
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- mii.c: MII interface library
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-
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- Ported to iPXE by Daniel Verkamp <daniel@drv.nu>
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- from Linux drivers/net/mii.c
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-
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- Maintained by Jeff Garzik <jgarzik@pobox.com>
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- Copyright 2001,2002 Jeff Garzik
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-
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- Various code came from myson803.c and other files by
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- Donald Becker. Copyright:
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-
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- Written 1998-2002 by Donald Becker.
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-
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- This software may be used and distributed according
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- to the terms of the GNU General Public License (GPL),
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- incorporated herein by reference. Drivers based on
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- or derived from this code fall under the GPL and must
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- retain the authorship, copyright and license notice.
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- This file is not a complete program and may only be
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- used when the entire operating system is licensed
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- under the GPL.
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-
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- The author may be reached as becker@scyld.com, or C/O
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- Scyld Computing Corporation
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- 410 Severn Ave., Suite 210
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- Annapolis MD 21403
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-
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-*/
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-
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-#include <mii.h>
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-
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-/**
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- * mii_link_ok - is link status up/ok
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- * @mii: the MII interface
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- *
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- * Returns 1 if the MII reports link status up/ok, 0 otherwise.
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- */
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-int
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-mii_link_ok ( struct mii_if_info *mii )
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-{
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- /* first, a dummy read, needed to latch some MII phys */
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- mii->mdio_read ( mii->dev, mii->phy_id, MII_BMSR );
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- if ( mii->mdio_read ( mii->dev, mii->phy_id, MII_BMSR ) & BMSR_LSTATUS )
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- return 1;
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- return 0;
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-}
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-
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-/**
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- * mii_check_link - check MII link status
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- * @mii: MII interface
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- *
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- * If the link status changed (previous != current), call
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- * netif_carrier_on() if current link status is Up or call
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- * netif_carrier_off() if current link status is Down.
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- */
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-void
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-mii_check_link ( struct mii_if_info *mii )
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-{
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- int cur_link = mii_link_ok ( mii );
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- int prev_link = netdev_link_ok ( mii->dev );
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-
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- if ( cur_link && !prev_link )
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- netdev_link_up ( mii->dev );
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- else if (prev_link && !cur_link)
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- netdev_link_down ( mii->dev );
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-}
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-
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-
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-/**
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- * mii_check_media - check the MII interface for a duplex change
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- * @mii: the MII interface
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- * @ok_to_print: OK to print link up/down messages
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- * @init_media: OK to save duplex mode in @mii
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- *
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- * Returns 1 if the duplex mode changed, 0 if not.
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- * If the media type is forced, always returns 0.
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- */
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-unsigned int
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-mii_check_media ( struct mii_if_info *mii,
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- unsigned int ok_to_print,
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- unsigned int init_media )
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-{
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- unsigned int old_carrier, new_carrier;
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- int advertise, lpa, media, duplex;
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- int lpa2 = 0;
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-
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- /* if forced media, go no further */
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- if (mii->force_media)
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- return 0; /* duplex did not change */
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-
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- /* check current and old link status */
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- old_carrier = netdev_link_ok ( mii->dev ) ? 1 : 0;
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- new_carrier = (unsigned int) mii_link_ok ( mii );
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-
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- /* if carrier state did not change, this is a "bounce",
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- * just exit as everything is already set correctly
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- */
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- if ( ( ! init_media ) && ( old_carrier == new_carrier ) )
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- return 0; /* duplex did not change */
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-
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- /* no carrier, nothing much to do */
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- if ( ! new_carrier ) {
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- netdev_link_down ( mii->dev );
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- if ( ok_to_print )
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- DBG ( "%s: link down\n", mii->dev->name);
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- return 0; /* duplex did not change */
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- }
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-
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- /*
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- * we have carrier, see who's on the other end
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- */
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- netdev_link_up ( mii->dev );
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-
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- /* get MII advertise and LPA values */
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- if ( ( ! init_media ) && ( mii->advertising ) ) {
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- advertise = mii->advertising;
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- } else {
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- advertise = mii->mdio_read ( mii->dev, mii->phy_id, MII_ADVERTISE );
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- mii->advertising = advertise;
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- }
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- lpa = mii->mdio_read ( mii->dev, mii->phy_id, MII_LPA );
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- if ( mii->supports_gmii )
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- lpa2 = mii->mdio_read ( mii->dev, mii->phy_id, MII_STAT1000 );
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-
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- /* figure out media and duplex from advertise and LPA values */
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- media = mii_nway_result ( lpa & advertise );
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- duplex = ( media & ADVERTISE_FULL ) ? 1 : 0;
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- if ( lpa2 & LPA_1000FULL )
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- duplex = 1;
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-
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- if ( ok_to_print )
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- DBG ( "%s: link up, %sMbps, %s-duplex, lpa 0x%04X\n",
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- mii->dev->name,
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- lpa2 & ( LPA_1000FULL | LPA_1000HALF ) ? "1000" :
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- media & ( ADVERTISE_100FULL | ADVERTISE_100HALF ) ? "100" : "10",
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- duplex ? "full" : "half",
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- lpa);
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-
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- if ( ( init_media ) || ( mii->full_duplex != duplex ) ) {
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- mii->full_duplex = duplex;
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- return 1; /* duplex changed */
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- }
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-
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- return 0; /* duplex did not change */
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-}
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