davinci: emac: add new features to autonegotiate for EMAC

add more features like DUPLEX, 100MB link speed etc to auto negotiate
in EMAC driver. EMAC controller autonegotiates for these features with
PHYs which are on the board.

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

drivers/net/davinci_emac.c

@@ -279,16 +279,42 @@ static int gen_get_link_speed(int phy_addr)
 static int gen_auto_negotiate(int phy_addr)
 {
 	u_int16_t	tmp;
+	u_int16_t	val;
+	unsigned long	cntr = 0;
+
+	if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
+		return 0;
+
+	val = tmp | BMCR_FULLDPLX | BMCR_ANENABLE |
+						BMCR_SPEED100;
+	davinci_eth_phy_write(phy_addr, MII_BMCR, val);
+
+	if (!davinci_eth_phy_read(phy_addr, MII_ADVERTISE, &val))
+		return 0;
+
+	val |= (ADVERTISE_100FULL | ADVERTISE_100HALF | ADVERTISE_10FULL |
+							ADVERTISE_10HALF);
+	davinci_eth_phy_write(phy_addr, MII_ADVERTISE, val);
 
 	if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 		return(0);
 
 	/* Restart Auto_negotiation  */
-	tmp |= BMCR_ANENABLE;
+	tmp |= BMCR_ANRESTART;
 	davinci_eth_phy_write(phy_addr, MII_BMCR, tmp);
 
 	/*check AutoNegotiate complete */
-	udelay (10000);
+	do {
+		udelay(40000);
+		if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
+			return 0;
+
+		if (tmp & BMSR_ANEGCOMPLETE)
+			break;
+
+		cntr++;
+	} while (cntr < 200);
+
 	if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 		return(0);