[PATCH net-next V5 5/5] net: lan743x: Add support to ethtool phylink get and set settings

[Raju Lakkaraju <Raju.Lakkaraju@microchip.com>]

Add support to ethtool phylink functions:
  - get/set settings like speed, duplex etc
  - get/set the wake-on-lan (WOL)
  - get/set the energy-efficient ethernet (EEE)
  - get/set the pause

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
---
Change List:                                                                    
============                                                                    
V4 -> V5:
  - Remove the "phydev->eee_enabled" check to update the MAC EEE                
    enable/disable
  - Call lan743x_mac_eee_enable() with true after update tx_lpi_timer.
  - Add phy_support_eee() to initialize the EEE flags
V3 -> V4:
  - Remove the EEE private variables from LAN743x adapter strcture and fix the   
    EEE's set/get functions
  - Change lan743x_set_eee( ) to lan743x_mac_eee_enable( )
  - Fix the EEE's tx lpi counter update
V2 -> V3:
  - No change
V1 -> V2:                                                                       
  - Fix the phylink changes                                                                  

 .../net/ethernet/microchip/lan743x_ethtool.c  | 119 ++++++------------
 drivers/net/ethernet/microchip/lan743x_main.c |  22 ++++
 drivers/net/ethernet/microchip/lan743x_main.h |   1 +
 3 files changed, 63 insertions(+), 79 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index 3a63ec091413..574b492b25c3 100644
--- a/drivers/net/ethernet/microchip/lan743x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan743x_ethtool.c
@@ -1058,61 +1058,51 @@ static int lan743x_ethtool_get_eee(struct net_device *netdev,
 				   struct ethtool_keee *eee)
 {
 	struct lan743x_adapter *adapter = netdev_priv(netdev);
-	struct phy_device *phydev = netdev->phydev;
-	u32 buf;
-	int ret;
 
-	if (!phydev)
-		return -EIO;
-	if (!phydev->drv) {
-		netif_err(adapter, drv, adapter->netdev,
-			  "Missing PHY Driver\n");
-		return -EIO;
-	}
+	eee->tx_lpi_timer = lan743x_csr_read(adapter,
+					     MAC_EEE_TX_LPI_REQ_DLY_CNT);
 
-	ret = phy_ethtool_get_eee(phydev, eee);
-	if (ret < 0)
-		return ret;
+	return phylink_ethtool_get_eee(adapter->phylink, eee);
+}
 
-	buf = lan743x_csr_read(adapter, MAC_CR);
-	if (buf & MAC_CR_EEE_EN_) {
-		/* EEE_TX_LPI_REQ_DLY & tx_lpi_timer are same uSec unit */
-		buf = lan743x_csr_read(adapter, MAC_EEE_TX_LPI_REQ_DLY_CNT);
-		eee->tx_lpi_timer = buf;
-	} else {
-		eee->tx_lpi_timer = 0;
+static int lan743x_ethtool_set_eee(struct net_device *netdev,
+				   struct ethtool_keee *eee)
+{
+	struct lan743x_adapter *adapter = netdev_priv(netdev);
+	u32 tx_lpi_timer;
+
+	tx_lpi_timer = lan743x_csr_read(adapter, MAC_EEE_TX_LPI_REQ_DLY_CNT);
+	if (tx_lpi_timer != eee->tx_lpi_timer) {
+		/* Software should only change this field when Energy Efficient
+		 * Ethernet Enable (EEEEN) is cleared.
+		 * This function will trigger an autonegotiation restart and
+		 * eee will be reenabled during link up if eee was negotiated.
+		 */
+		lan743x_mac_eee_enable(adapter, false);
+		lan743x_csr_write(adapter, MAC_EEE_TX_LPI_REQ_DLY_CNT,
+				  eee->tx_lpi_timer);
+		lan743x_mac_eee_enable(adapter, true);
 	}
 
-	return 0;
+	return phylink_ethtool_set_eee(adapter->phylink, eee);
 }
 
-static int lan743x_ethtool_set_eee(struct net_device *netdev,
-				   struct ethtool_keee *eee)
+static int
+lan743x_ethtool_set_link_ksettings(struct net_device *netdev,
+				   const struct ethtool_link_ksettings *cmd)
 {
-	struct lan743x_adapter *adapter;
-	struct phy_device *phydev;
-	u32 buf = 0;
+	struct lan743x_adapter *adapter = netdev_priv(netdev);
 
-	if (!netdev)
-		return -EINVAL;
-	adapter = netdev_priv(netdev);
-	if (!adapter)
-		return -EINVAL;
-	phydev = netdev->phydev;
-	if (!phydev)
-		return -EIO;
-	if (!phydev->drv) {
-		netif_err(adapter, drv, adapter->netdev,
-			  "Missing PHY Driver\n");
-		return -EIO;
-	}
+	return phylink_ethtool_ksettings_set(adapter->phylink, cmd);
+}
 
-	if (eee->eee_enabled) {
-		buf = (u32)eee->tx_lpi_timer;
-		lan743x_csr_write(adapter, MAC_EEE_TX_LPI_REQ_DLY_CNT, buf);
-	}
+static int
+lan743x_ethtool_get_link_ksettings(struct net_device *netdev,
+				   struct ethtool_link_ksettings *cmd)
+{
+	struct lan743x_adapter *adapter = netdev_priv(netdev);
 
-	return phy_ethtool_set_eee(phydev, eee);
+	return phylink_ethtool_ksettings_get(adapter->phylink, cmd);
 }
 
 #ifdef CONFIG_PM
@@ -1124,8 +1114,7 @@ static void lan743x_ethtool_get_wol(struct net_device *netdev,
 	wol->supported = 0;
 	wol->wolopts = 0;
 
-	if (netdev->phydev)
-		phy_ethtool_get_wol(netdev->phydev, wol);
+	phylink_ethtool_get_wol(adapter->phylink, wol);
 
 	if (wol->supported != adapter->phy_wol_supported)
 		netif_warn(adapter, drv, adapter->netdev,
@@ -1166,7 +1155,7 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 		    !(adapter->phy_wol_supported & WAKE_MAGICSECURE))
 			phy_wol.wolopts &= ~WAKE_MAGIC;
 
-		ret = phy_ethtool_set_wol(netdev->phydev, &phy_wol);
+		ret = phylink_ethtool_set_wol(adapter->phylink, wol);
 		if (ret && (ret != -EOPNOTSUPP))
 			return ret;
 
@@ -1355,44 +1344,16 @@ static void lan743x_get_pauseparam(struct net_device *dev,
 				   struct ethtool_pauseparam *pause)
 {
 	struct lan743x_adapter *adapter = netdev_priv(dev);
-	struct lan743x_phy *phy = &adapter->phy;
 
-	if (phy->fc_request_control & FLOW_CTRL_TX)
-		pause->tx_pause = 1;
-	if (phy->fc_request_control & FLOW_CTRL_RX)
-		pause->rx_pause = 1;
-	pause->autoneg = phy->fc_autoneg;
+	phylink_ethtool_get_pauseparam(adapter->phylink, pause);
 }
 
 static int lan743x_set_pauseparam(struct net_device *dev,
 				  struct ethtool_pauseparam *pause)
 {
 	struct lan743x_adapter *adapter = netdev_priv(dev);
-	struct phy_device *phydev = dev->phydev;
-	struct lan743x_phy *phy = &adapter->phy;
 
-	if (!phydev)
-		return -ENODEV;
-
-	if (!phy_validate_pause(phydev, pause))
-		return -EINVAL;
-
-	phy->fc_request_control = 0;
-	if (pause->rx_pause)
-		phy->fc_request_control |= FLOW_CTRL_RX;
-
-	if (pause->tx_pause)
-		phy->fc_request_control |= FLOW_CTRL_TX;
-
-	phy->fc_autoneg = pause->autoneg;
-
-	if (pause->autoneg == AUTONEG_DISABLE)
-		lan743x_mac_flow_ctrl_set_enables(adapter, pause->tx_pause,
-						  pause->rx_pause);
-	else
-		phy_set_asym_pause(phydev, pause->rx_pause,  pause->tx_pause);
-
-	return 0;
+	return phylink_ethtool_set_pauseparam(adapter->phylink, pause);
 }
 
 const struct ethtool_ops lan743x_ethtool_ops = {
@@ -1417,8 +1378,8 @@ const struct ethtool_ops lan743x_ethtool_ops = {
 	.get_ts_info = lan743x_ethtool_get_ts_info,
 	.get_eee = lan743x_ethtool_get_eee,
 	.set_eee = lan743x_ethtool_set_eee,
-	.get_link_ksettings = phy_ethtool_get_link_ksettings,
-	.set_link_ksettings = phy_ethtool_set_link_ksettings,
+	.get_link_ksettings = lan743x_ethtool_get_link_ksettings,
+	.set_link_ksettings = lan743x_ethtool_set_link_ksettings,
 	.get_regs_len = lan743x_get_regs_len,
 	.get_regs = lan743x_get_regs,
 	.get_pauseparam = lan743x_get_pauseparam,
diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index 2da05c50fe53..ff78239eb121 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -2966,6 +2966,18 @@ static int lan743x_phylink_2500basex_config(struct lan743x_adapter *adapter)
 	return lan743x_pcs_power_reset(adapter);
 }
 
+void lan743x_mac_eee_enable(struct lan743x_adapter *adapter, bool enable)
+{
+	u32 mac_cr;
+
+	mac_cr = lan743x_csr_read(adapter, MAC_CR);
+	if (enable)
+		mac_cr |= MAC_CR_EEE_EN_;
+	else
+		mac_cr &= ~MAC_CR_EEE_EN_;
+	lan743x_csr_write(adapter, MAC_CR, mac_cr);
+}
+
 static void lan743x_phylink_mac_config(struct phylink_config *config,
 				       unsigned int link_an_mode,
 				       const struct phylink_link_state *state)
@@ -3014,7 +3026,11 @@ static void lan743x_phylink_mac_link_down(struct phylink_config *config,
 					  unsigned int link_an_mode,
 					  phy_interface_t interface)
 {
+	struct net_device *netdev = to_net_dev(config->dev);
+	struct lan743x_adapter *adapter = netdev_priv(netdev);
+
 	netif_tx_stop_all_queues(to_net_dev(config->dev));
+	lan743x_mac_eee_enable(adapter, false);
 }
 
 static void lan743x_phylink_mac_link_up(struct phylink_config *config,
@@ -3056,6 +3072,9 @@ static void lan743x_phylink_mac_link_up(struct phylink_config *config,
 					  cap & FLOW_CTRL_TX,
 					  cap & FLOW_CTRL_RX);
 
+	if (phydev)
+		lan743x_mac_eee_enable(adapter, phydev->enable_tx_lpi);
+
 	netif_tx_wake_all_queues(netdev);
 }
 
@@ -3265,6 +3284,9 @@ static int lan743x_netdev_open(struct net_device *netdev)
 			goto close_tx;
 	}
 
+	if (netdev->phydev)
+		phy_support_eee(netdev->phydev);
+
 #ifdef CONFIG_PM
 	if (adapter->netdev->phydev) {
 		struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
index 7f73d66854be..8ef897c114d3 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.h
+++ b/drivers/net/ethernet/microchip/lan743x_main.h
@@ -1206,5 +1206,6 @@ void lan743x_hs_syslock_release(struct lan743x_adapter *adapter);
 void lan743x_mac_flow_ctrl_set_enables(struct lan743x_adapter *adapter,
 				       bool tx_enable, bool rx_enable);
 int lan743x_sgmii_read(struct lan743x_adapter *adapter, u8 mmd, u16 addr);
+void lan743x_mac_eee_enable(struct lan743x_adapter *adapter, bool enable);
 
 #endif /* _LAN743X_H */
-- 
2.34.1