[PATCH v4 net-next 7/8] lan743x: Add EEE support

[Bryan Whitehead <Bryan.Whitehead@microchip.com>]

Implement EEE support

Signed-off-by: Bryan Whitehead <Bryan.Whitehead@microchip.com>
---
 drivers/net/ethernet/microchip/lan743x_ethtool.c | 85 ++++++++++++++++++++++++
 drivers/net/ethernet/microchip/lan743x_main.h    |  3 +
 2 files changed, 88 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index 56b45aa..86134d4 100644
--- a/drivers/net/ethernet/microchip/lan743x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan743x_ethtool.c
@@ -415,6 +415,89 @@ static int lan743x_ethtool_get_sset_count(struct net_device *netdev, int sset)
 	}
 }
 
+static int lan743x_ethtool_get_eee(struct net_device *netdev,
+				   struct ethtool_eee *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;
+	}
+
+	ret = phy_ethtool_get_eee(phydev, eee);
+	if (ret < 0)
+		return ret;
+
+	buf = lan743x_csr_read(adapter, MAC_CR);
+	if (buf & MAC_CR_EEE_EN_) {
+		eee->eee_enabled = true;
+		eee->eee_active = !!(eee->advertised & eee->lp_advertised);
+		eee->tx_lpi_enabled = true;
+		/* 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->eee_enabled = false;
+		eee->eee_active = false;
+		eee->tx_lpi_enabled = false;
+		eee->tx_lpi_timer = 0;
+	}
+
+	return 0;
+}
+
+static int lan743x_ethtool_set_eee(struct net_device *netdev,
+				   struct ethtool_eee *eee)
+{
+	struct lan743x_adapter *adapter = netdev_priv(netdev);
+	struct phy_device *phydev = NULL;
+	u32 buf = 0;
+	int ret = 0;
+
+	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;
+	}
+
+	if (eee->eee_enabled) {
+		ret = phy_init_eee(phydev, 0);
+		if (ret) {
+			netif_err(adapter, drv, adapter->netdev,
+				  "EEE initialization failed\n");
+			return ret;
+		}
+
+		buf = (u32)eee->tx_lpi_timer;
+		lan743x_csr_write(adapter, MAC_EEE_TX_LPI_REQ_DLY_CNT, buf);
+
+		buf = lan743x_csr_read(adapter, MAC_CR);
+		buf |= MAC_CR_EEE_EN_;
+		lan743x_csr_write(adapter, MAC_CR, buf);
+	} else {
+		buf = lan743x_csr_read(adapter, MAC_CR);
+		buf &= ~MAC_CR_EEE_EN_;
+		lan743x_csr_write(adapter, MAC_CR, buf);
+	}
+
+	return phy_ethtool_set_eee(phydev, eee);
+}
+
 #ifdef CONFIG_PM
 static void lan743x_ethtool_get_wol(struct net_device *netdev,
 				    struct ethtool_wolinfo *wol)
@@ -470,6 +553,8 @@ const struct ethtool_ops lan743x_ethtool_ops = {
 	.get_strings = lan743x_ethtool_get_strings,
 	.get_ethtool_stats = lan743x_ethtool_get_ethtool_stats,
 	.get_sset_count = lan743x_ethtool_get_sset_count,
+	.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,
 #ifdef CONFIG_PM
diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
index 72b9beb..93cb60a 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.h
+++ b/drivers/net/ethernet/microchip/lan743x_main.h
@@ -82,6 +82,7 @@
 	((value << 0) & FCT_FLOW_CTL_ON_THRESHOLD_)
 
 #define MAC_CR				(0x100)
+#define MAC_CR_EEE_EN_			BIT(17)
 #define MAC_CR_ADD_			BIT(12)
 #define MAC_CR_ASD_			BIT(11)
 #define MAC_CR_CNTR_RST_		BIT(5)
@@ -117,6 +118,8 @@
 
 #define MAC_MII_DATA			(0x124)
 
+#define MAC_EEE_TX_LPI_REQ_DLY_CNT		(0x130)
+
 #define MAC_WUCSR				(0x140)
 #define MAC_WUCSR_RFE_WAKE_EN_			BIT(14)
 #define MAC_WUCSR_PFDA_EN_			BIT(3)
-- 
2.7.4