[PATCH net-next v2] net: ethernet: mediatek: add EEE support

[Qingfang Deng <dqfext@gmail.com>]

Add EEE support to MediaTek SoC Ethernet. The register fields are
similar to the ones in MT7531, except that the LPI threshold is in
milliseconds.

Signed-off-by: Qingfang Deng <dqfext@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 64 +++++++++++++++++++++
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++++
 2 files changed, 75 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 53485142938c..943636d822b5 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -786,6 +786,7 @@ static void mtk_mac_link_up(struct phylink_config *config,
 
 	mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
 	mcr &= ~(MAC_MCR_SPEED_100 | MAC_MCR_SPEED_1000 |
+		 MAC_MCR_EEE100M | MAC_MCR_EEE1G |
 		 MAC_MCR_FORCE_DPX | MAC_MCR_FORCE_TX_FC |
 		 MAC_MCR_FORCE_RX_FC);
 
@@ -811,6 +812,18 @@ static void mtk_mac_link_up(struct phylink_config *config,
 	if (rx_pause)
 		mcr |= MAC_MCR_FORCE_RX_FC;
 
+	if (mode == MLO_AN_PHY && phy && phy_init_eee(phy, false) >= 0) {
+		switch (speed) {
+		case SPEED_2500:
+		case SPEED_1000:
+			mcr |= MAC_MCR_EEE1G;
+			break;
+		case SPEED_100:
+			mcr |= MAC_MCR_EEE100M;
+			break;
+		}
+	}
+
 	mcr |= MAC_MCR_TX_EN | MAC_MCR_RX_EN | MAC_MCR_FORCE_LINK;
 	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
 }
@@ -4474,6 +4487,55 @@ static int mtk_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam
 	return phylink_ethtool_set_pauseparam(mac->phylink, pause);
 }
 
+static int mtk_get_eee(struct net_device *dev, struct ethtool_keee *eee)
+{
+	struct mtk_mac *mac = netdev_priv(dev);
+	u32 reg;
+	int ret;
+
+	ret = phylink_ethtool_get_eee(mac->phylink, eee);
+	if (ret)
+		return ret;
+
+	reg = mtk_r32(mac->hw, MTK_MAC_EEECR(mac->id));
+	eee->tx_lpi_enabled = !(reg & MAC_EEE_LPI_MODE);
+	eee->tx_lpi_timer = FIELD_GET(MAC_EEE_LPI_TXIDLE_THD, reg) * 1000;
+
+	return 0;
+}
+
+static int mtk_set_eee(struct net_device *dev, struct ethtool_keee *eee)
+{
+	struct mtk_mac *mac = netdev_priv(dev);
+	u32 txidle_thd_ms, reg;
+	int ret;
+
+	/* Tx idle timer in ms */
+	txidle_thd_ms = DIV_ROUND_UP(eee->tx_lpi_timer, 1000);
+	if (!FIELD_FIT(MAC_EEE_LPI_TXIDLE_THD, txidle_thd_ms))
+		return -EINVAL;
+
+	reg = FIELD_PREP(MAC_EEE_LPI_TXIDLE_THD, txidle_thd_ms);
+
+	/* PHY Wake-up time, this field does not have a reset value, so use the
+	 * reset value from MT7531 (36us for 100BaseT and 17us for 1000BaseT).
+	 */
+	reg |= FIELD_PREP(MAC_EEE_WAKEUP_TIME_1000, 17) |
+	       FIELD_PREP(MAC_EEE_WAKEUP_TIME_100, 36);
+
+	if (!eee->tx_lpi_enabled)
+		/* Force LPI Mode without a delay */
+		reg |= MAC_EEE_LPI_MODE;
+
+	ret = phylink_ethtool_set_eee(mac->phylink, eee);
+	if (ret)
+		return ret;
+
+	mtk_w32(mac->hw, reg, MTK_MAC_EEECR(mac->id));
+
+	return 0;
+}
+
 static u16 mtk_select_queue(struct net_device *dev, struct sk_buff *skb,
 			    struct net_device *sb_dev)
 {
@@ -4506,6 +4568,8 @@ static const struct ethtool_ops mtk_ethtool_ops = {
 	.set_pauseparam		= mtk_set_pauseparam,
 	.get_rxnfc		= mtk_get_rxnfc,
 	.set_rxnfc		= mtk_set_rxnfc,
+	.get_eee		= mtk_get_eee,
+	.set_eee		= mtk_set_eee,
 };
 
 static const struct net_device_ops mtk_netdev_ops = {
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 0d5225f1d3ee..90a377ab4359 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -453,6 +453,8 @@
 #define MAC_MCR_RX_FIFO_CLR_DIS	BIT(12)
 #define MAC_MCR_BACKOFF_EN	BIT(9)
 #define MAC_MCR_BACKPR_EN	BIT(8)
+#define MAC_MCR_EEE1G		BIT(7)
+#define MAC_MCR_EEE100M		BIT(6)
 #define MAC_MCR_FORCE_RX_FC	BIT(5)
 #define MAC_MCR_FORCE_TX_FC	BIT(4)
 #define MAC_MCR_SPEED_1000	BIT(3)
@@ -461,6 +463,15 @@
 #define MAC_MCR_FORCE_LINK	BIT(0)
 #define MAC_MCR_FORCE_LINK_DOWN	(MAC_MCR_FORCE_MODE)
 
+/* Mac EEE control registers */
+#define MTK_MAC_EEECR(x)		(0x10104 + (x * 0x100))
+#define MAC_EEE_WAKEUP_TIME_1000	GENMASK(31, 24)
+#define MAC_EEE_WAKEUP_TIME_100		GENMASK(23, 16)
+#define MAC_EEE_LPI_TXIDLE_THD		GENMASK(15, 8)
+#define MAC_EEE_CKG_TXIDLE		BIT(3)
+#define MAC_EEE_CKG_RXLPI		BIT(2)
+#define MAC_EEE_LPI_MODE		BIT(0)
+
 /* Mac status registers */
 #define MTK_MAC_MSR(x)		(0x10108 + (x * 0x100))
 #define MAC_MSR_EEE1G		BIT(7)
-- 
2.43.0