mii.c File Reference

#include <mii.h>

Go to the source code of this file.

Functions
int	mii_link_ok (struct mii_if_info *mii)
	mii_link_ok - is link status up/ok : the MII interface
void	mii_check_link (struct mii_if_info *mii)
	mii_check_link - check MII link status : MII interface
unsigned int	mii_check_media (struct mii_if_info *mii, unsigned int ok_to_print, unsigned int init_media)
	mii_check_media - check the MII interface for a duplex change : the MII interface : OK to print link up/down messages : OK to save duplex mode in

---

Function Documentation

int mii_link_ok

(

struct mii_if_info *

mii

)

mii_link_ok - is link status up/ok : the MII interface

Returns 1 if the MII reports link status up/ok, 0 otherwise.

Definition at line 41 of file mii.c.

References BMSR_LSTATUS, mii_if_info::dev, mii_if_info::mdio_read, MII_BMSR, and mii_if_info::phy_id.

Referenced by mii_check_link(), and mii_check_media().

{
        /* first, a dummy read, needed to latch some MII phys */
        mii->mdio_read ( mii->dev, mii->phy_id, MII_BMSR );
        if ( mii->mdio_read ( mii->dev, mii->phy_id, MII_BMSR ) & BMSR_LSTATUS )
                return 1;
        return 0;
}

void mii_check_link

(

struct mii_if_info *

mii

)

mii_check_link - check MII link status : MII interface

If the link status changed (previous != current), call netif_carrier_on() if current link status is Up or call netif_carrier_off() if current link status is Down.

Definition at line 59 of file mii.c.

References mii_if_info::dev, mii_link_ok(), netdev_link_down(), netdev_link_ok(), and netdev_link_up().

{
        int cur_link = mii_link_ok ( mii );
        int prev_link = netdev_link_ok ( mii->dev );

        if ( cur_link && !prev_link )
                netdev_link_up ( mii->dev );
        else if (prev_link && !cur_link)
                netdev_link_down ( mii->dev );
}

unsigned int mii_check_media	(	struct mii_if_info *	mii,
		unsigned int	ok_to_print,
		unsigned int	init_media
	)

mii_check_media - check the MII interface for a duplex change : the MII interface : OK to print link up/down messages : OK to save duplex mode in

Returns 1 if the duplex mode changed, 0 if not. If the media type is forced, always returns 0.

Definition at line 81 of file mii.c.

References ADVERTISE_100FULL, ADVERTISE_100HALF, ADVERTISE_FULL, mii_if_info::advertising, DBG, mii_if_info::dev, mii_if_info::force_media, mii_if_info::full_duplex, LPA_1000FULL, LPA_1000HALF, mii_if_info::mdio_read, media, MII_ADVERTISE, mii_link_ok(), MII_LPA, mii_nway_result(), MII_STAT1000, net_device::name, netdev_link_down(), netdev_link_ok(), netdev_link_up(), mii_if_info::phy_id, and mii_if_info::supports_gmii.

{
        unsigned int old_carrier, new_carrier;
        int advertise, lpa, media, duplex;
        int lpa2 = 0;

        /* if forced media, go no further */
        if (mii->force_media)
                return 0; /* duplex did not change */

        /* check current and old link status */
        old_carrier = netdev_link_ok ( mii->dev ) ? 1 : 0;
        new_carrier = (unsigned int) mii_link_ok ( mii );

        /* if carrier state did not change, this is a "bounce",
         * just exit as everything is already set correctly
         */
        if ( ( ! init_media ) && ( old_carrier == new_carrier ) )
                return 0; /* duplex did not change */

        /* no carrier, nothing much to do */
        if ( ! new_carrier ) {
                netdev_link_down ( mii->dev );
                if ( ok_to_print )
                        DBG ( "%s: link down\n", mii->dev->name);
                return 0; /* duplex did not change */
        }

        /*
         * we have carrier, see who's on the other end
         */
        netdev_link_up ( mii->dev );

        /* get MII advertise and LPA values */
        if ( ( ! init_media ) && ( mii->advertising ) ) {
                advertise = mii->advertising;
        } else {
                advertise = mii->mdio_read ( mii->dev, mii->phy_id, MII_ADVERTISE );
                mii->advertising = advertise;
        }
        lpa = mii->mdio_read ( mii->dev, mii->phy_id, MII_LPA );
        if ( mii->supports_gmii )
                lpa2 = mii->mdio_read ( mii->dev, mii->phy_id, MII_STAT1000 );

        /* figure out media and duplex from advertise and LPA values */
        media = mii_nway_result ( lpa & advertise );
        duplex = ( media & ADVERTISE_FULL ) ? 1 : 0;
        if ( lpa2 & LPA_1000FULL )
                duplex = 1;

        if ( ok_to_print )
                DBG ( "%s: link up, %sMbps, %s-duplex, lpa 0x%04X\n",
                       mii->dev->name,
                       lpa2 & ( LPA_1000FULL | LPA_1000HALF ) ? "1000" :
                       media & ( ADVERTISE_100FULL | ADVERTISE_100HALF ) ? "100" : "10",
                       duplex ? "full" : "half",
                       lpa);

        if ( ( init_media ) || ( mii->full_duplex != duplex ) ) {
                mii->full_duplex = duplex;
                return 1; /* duplex changed */
        }

        return 0; /* duplex did not change */
}