[ethernet] Add MII link status functions from Linux

Signed-off-by: Michael Brown <mcb30@etherboot.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/include/mii.h b/src/include/mii.h
index 05c54f09..3b735d99 100755
--- a/src/include/mii.h
+++ b/src/include/mii.h
@@ -157,4 +157,63 @@ struct mii_if_info {
         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 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);
+
+
+/**
+ * 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