net: phy: add qca8081 read_status

1. Separate the function at803x_read_specific_status from
the at803x_read_status, since it can be reused by the
read_status of qca8081 phy driver excepting adding the
2500M speed.

2. Add the qca8081 read_status function qca808x_read_status.

Signed-off-by: Luo Jie <luoj@codeaurora.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Luo Jie

drivers/net/phy/at803x.c

@@ -41,6 +41,9 @@
 #define AT803X_SS_SPEED_DUPLEX_RESOLVED		BIT(11)
 #define AT803X_SS_MDIX				BIT(6)
 
+#define QCA808X_SS_SPEED_MASK			GENMASK(9, 7)
+#define QCA808X_SS_SPEED_2500			4
+
 #define AT803X_INTR_ENABLE			0x12
 #define AT803X_INTR_ENABLE_AUTONEG_ERR		BIT(15)
 #define AT803X_INTR_ENABLE_SPEED_CHANGED	BIT(14)
@@ -959,27 +962,9 @@ static void at803x_link_change_notify(struct phy_device *phydev)
 	}
 }
 
-static int at803x_read_status(struct phy_device *phydev)
+static int at803x_read_specific_status(struct phy_device *phydev)
 {
-	int ss, err, old_link = phydev->link;
-
-	/* Update the link, but return if there was an error */
-	err = genphy_update_link(phydev);
-	if (err)
-		return err;
-
-	/* why bother the PHY if nothing can have changed */
-	if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
-		return 0;
-
-	phydev->speed = SPEED_UNKNOWN;
-	phydev->duplex = DUPLEX_UNKNOWN;
-	phydev->pause = 0;
-	phydev->asym_pause = 0;
-
-	err = genphy_read_lpa(phydev);
-	if (err < 0)
-		return err;
+	int ss;
 
 	/* Read the AT8035 PHY-Specific Status register, which indicates the
 	 * speed and duplex that the PHY is actually using, irrespective of
@@ -990,13 +975,19 @@ static int at803x_read_status(struct phy_device *phydev)
 		return ss;
 
 	if (ss & AT803X_SS_SPEED_DUPLEX_RESOLVED) {
-		int sfc;
+		int sfc, speed;
 
 		sfc = phy_read(phydev, AT803X_SPECIFIC_FUNCTION_CONTROL);
 		if (sfc < 0)
 			return sfc;
 
-		switch (FIELD_GET(AT803X_SS_SPEED_MASK, ss)) {
+		/* qca8081 takes the different bits for speed value from at803x */
+		if (phydev->drv->phy_id == QCA8081_PHY_ID)
+			speed = FIELD_GET(QCA808X_SS_SPEED_MASK, ss);
+		else
+			speed = FIELD_GET(AT803X_SS_SPEED_MASK, ss);
+
+		switch (speed) {
 		case AT803X_SS_SPEED_10:
 			phydev->speed = SPEED_10;
 			break;
@@ -1006,6 +997,9 @@ static int at803x_read_status(struct phy_device *phydev)
 		case AT803X_SS_SPEED_1000:
 			phydev->speed = SPEED_1000;
 			break;
+		case QCA808X_SS_SPEED_2500:
+			phydev->speed = SPEED_2500;
+			break;
 		}
 		if (ss & AT803X_SS_DUPLEX)
 			phydev->duplex = DUPLEX_FULL;
@@ -1030,6 +1024,35 @@ static int at803x_read_status(struct phy_device *phydev)
 		}
 	}
 
+	return 0;
+}
+
+static int at803x_read_status(struct phy_device *phydev)
+{
+	int err, old_link = phydev->link;
+
+	/* Update the link, but return if there was an error */
+	err = genphy_update_link(phydev);
+	if (err)
+		return err;
+
+	/* why bother the PHY if nothing can have changed */
+	if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
+		return 0;
+
+	phydev->speed = SPEED_UNKNOWN;
+	phydev->duplex = DUPLEX_UNKNOWN;
+	phydev->pause = 0;
+	phydev->asym_pause = 0;
+
+	err = genphy_read_lpa(phydev);
+	if (err < 0)
+		return err;
+
+	err = at803x_read_specific_status(phydev);
+	if (err < 0)
+		return err;
+
 	if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete)
 		phy_resolve_aneg_pause(phydev);
 
@@ -1434,6 +1457,33 @@ static int qca83xx_suspend(struct phy_device *phydev)
 	return 0;
 }
 
+static int qca808x_read_status(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
+	if (ret < 0)
+		return ret;
+
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->lp_advertising,
+			ret & MDIO_AN_10GBT_STAT_LP2_5G);
+
+	ret = genphy_read_status(phydev);
+	if (ret)
+		return ret;
+
+	ret = at803x_read_specific_status(phydev);
+	if (ret < 0)
+		return ret;
+
+	if (phydev->link && phydev->speed == SPEED_2500)
+		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+	else
+		phydev->interface = PHY_INTERFACE_MODE_SMII;
+
+	return 0;
+}
+
 static struct phy_driver at803x_driver[] = {
 {
 	/* Qualcomm Atheros AR8035 */
@@ -1605,6 +1655,7 @@ static struct phy_driver at803x_driver[] = {
 	.get_wol		= at803x_get_wol,
 	.suspend		= genphy_suspend,
 	.resume			= genphy_resume,
+	.read_status		= qca808x_read_status,
 }, };
 
 module_phy_driver(at803x_driver);