X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fmii.h;h=ad748588faf1a2c0e6af662dfd1e790ecc766aa9;hb=dcd241c384357e5c146299d45d2ee2f4ad439723;hp=151b7e0182c7e6dcce9574a0b3f60dc96a544016;hpb=08f3dfe8c4b91189890019d307aad236c3633515;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/mii.h b/include/linux/mii.h
index 151b7e0182c..ad748588faf 100644
--- a/include/linux/mii.h
+++ b/include/linux/mii.h
@@ -135,6 +135,10 @@
 #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
+
 /* This structure is used in all SIOCxMIIxxx ioctl calls */
 struct mii_ioctl_data {
 	__u16		phy_id;
@@ -235,5 +239,34 @@ static inline unsigned int mii_duplex (unsigned int duplex_lock,
 	return 0;
 }
 
+/**
+ * mii_resolve_flowctrl_fdx
+ * @lcladv: value of MII ADVERTISE register
+ * @rmtadv: value of MII LPA register
+ *
+ * Resolve full duplex flow control as per IEEE 802.3-2005 table 28B-3
+ */
+static inline u8 mii_resolve_flowctrl_fdx(u16 lcladv, u16 rmtadv)
+{
+	u8 cap = 0;
+
+	if (lcladv & ADVERTISE_PAUSE_CAP) {
+		if (lcladv & ADVERTISE_PAUSE_ASYM) {
+			if (rmtadv & LPA_PAUSE_CAP)
+				cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
+			else if (rmtadv & LPA_PAUSE_ASYM)
+				cap = FLOW_CTRL_RX;
+		} else {
+			if (rmtadv & LPA_PAUSE_CAP)
+				cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
+		}
+	} else if (lcladv & ADVERTISE_PAUSE_ASYM) {
+		if ((rmtadv & LPA_PAUSE_CAP) && (rmtadv & LPA_PAUSE_ASYM))
+			cap = FLOW_CTRL_TX;
+	}
+
+	return cap;
+}
+
 #endif /* __KERNEL__ */
 #endif /* __LINUX_MII_H__ */