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-rw-r--r--gpxe/src/net/mii.c147
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+/*
+
+ mii.c: MII interface library
+
+ Ported to gPXE by Daniel Verkamp <daniel@drv.nu>
+ from Linux drivers/net/mii.c
+
+ Maintained by Jeff Garzik <jgarzik@pobox.com>
+ Copyright 2001,2002 Jeff Garzik
+
+ Various code came from myson803.c and other files by
+ Donald Becker. Copyright:
+
+ Written 1998-2002 by Donald Becker.
+
+ This software may be used and distributed according
+ to the terms of the GNU General Public License (GPL),
+ incorporated herein by reference. Drivers based on
+ or derived from this code fall under the GPL and must
+ retain the authorship, copyright and license notice.
+ This file is not a complete program and may only be
+ used when the entire operating system is licensed
+ under the GPL.
+
+ The author may be reached as becker@scyld.com, or C/O
+ Scyld Computing Corporation
+ 410 Severn Ave., Suite 210
+ Annapolis MD 21403
+
+*/
+
+#include <mii.h>
+
+/**
+ * mii_link_ok - is link status up/ok
+ * @mii: the MII interface
+ *
+ * Returns 1 if the MII reports link status up/ok, 0 otherwise.
+ */
+int
+mii_link_ok ( struct mii_if_info *mii )
+{
+ /* 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;
+}
+
+/**
+ * mii_check_link - check MII link status
+ * @mii: 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.
+ */
+void
+mii_check_link ( struct mii_if_info *mii )
+{
+ 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 );
+}
+
+
+/**
+ * mii_check_media - check the MII interface for a duplex change
+ * @mii: the MII interface
+ * @ok_to_print: OK to print link up/down messages
+ * @init_media: OK to save duplex mode in @mii
+ *
+ * Returns 1 if the duplex mode changed, 0 if not.
+ * If the media type is forced, always returns 0.
+ */
+unsigned int
+mii_check_media ( struct mii_if_info *mii,
+ unsigned int ok_to_print,
+ unsigned int init_media )
+{
+ 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 */
+}