Subject: [PATCH net-next] net: dsa: mt7530: Add support for EEE features

From: René van Dorst <[email-masked]>
Date: Sat, 10 Apr 2021 00:53:46 +0200

This patch adds EEE support.

Signed-off-by: René van Dorst <[email-masked]>
---
 drivers/net/dsa/mt7530.c | 50 ++++++++++++++++++++++++++++++++++++++++
 drivers/net/dsa/mt7530.h | 16 ++++++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 2bd1bab71497..daa87b0baa65 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2568,6 +2568,11 @@ static void mt753x_phylink_mac_link_up(struct dsa_switch *ds, int port,
 			mcr |= PMCR_TX_FC_EN;
 		if (rx_pause)
 			mcr |= PMCR_RX_FC_EN;
+
+		if (mode == MLO_AN_PHY && phydev &&
+		    !(priv->eee_disabled & BIT(port)) &&
+		    phy_init_eee(phydev, 0) >= 0)
+			mcr |= PMCR_FORCE_EEE1G | PMCR_FORCE_EEE100;
 	}
 
 	mt7530_set(priv, MT7530_PMCR_P(port), mcr);
@@ -2800,6 +2805,49 @@ mt753x_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 	return priv->info->phy_write(ds, port, regnum, val);
 }
 
+static int mt753x_get_mac_eee(struct dsa_switch *ds, int port,
+			      struct ethtool_eee *e)
+{
+	struct mt7530_priv *priv = ds->priv;
+	u32 eeecr, pmsr;
+
+	e->eee_enabled = !(priv->eee_disabled & BIT(port));
+
+	if (e->eee_enabled) {
+		eeecr = mt7530_read(priv, MT7530_PMEEECR_P(port));
+		e->tx_lpi_enabled = !(eeecr & LPI_MODE_EN);
+		e->tx_lpi_timer = GET_LPI_THRESH(eeecr);
+		pmsr = mt7530_read(priv, MT7530_PMSR_P(port));
+		e->eee_active = e->eee_enabled && !!(pmsr & PMSR_EEE1G);
+	}
+
+	return 0;
+}
+
+static int mt753x_set_mac_eee(struct dsa_switch *ds, int port,
+			      struct ethtool_eee *e)
+{
+	struct mt7530_priv *priv = ds->priv;
+	u32 eeecr;
+
+	if (e->eee_enabled) {
+		if (e->tx_lpi_timer > 0xFFF)
+			return -EINVAL;
+		priv->eee_disabled &= ~BIT(port);
+		eeecr = mt7530_read(priv, MT7530_PMEEECR_P(port));
+		eeecr &= ~(LPI_THRESH_MASK | LPI_MODE_EN);
+		if (!e->tx_lpi_enabled)
+			/* Force LPI Mode without a delay */
+			eeecr |= LPI_MODE_EN;
+		eeecr |= SET_LPI_THRESH(e->tx_lpi_timer);
+		mt7530_write(priv, MT7530_PMEEECR_P(port), eeecr);
+	} else {
+		priv->eee_disabled |= BIT(port);
+	}
+
+	return 0;
+}
+
 static const struct dsa_switch_ops mt7530_switch_ops = {
 	.get_tag_protocol	= mtk_get_tag_protocol,
 	.setup			= mt753x_setup,
@@ -2835,6 +2883,8 @@ static const struct dsa_switch_ops mt7530_switch_ops = {
 	.phylink_mac_an_restart	= mt753x_phylink_mac_an_restart,
 	.phylink_mac_link_down	= mt753x_phylink_mac_link_down,
 	.phylink_mac_link_up	= mt753x_phylink_mac_link_up,
+	.get_mac_eee		= mt753x_get_mac_eee,
+	.set_mac_eee		= mt753x_set_mac_eee,
 };
 
 static const struct mt753x_info mt753x_table[] = {
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index ec36ea5dfd57..02f983df26bc 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -257,6 +257,8 @@ enum mt7530_vlan_port_attr {
 #define  PMCR_RX_EN			BIT(13)
 #define  PMCR_BACKOFF_EN		BIT(9)
 #define  PMCR_BACKPR_EN			BIT(8)
+#define  PMCR_FORCE_EEE1G		BIT(7)
+#define  PMCR_FORCE_EEE100		BIT(6)
 #define  PMCR_TX_FC_EN			BIT(5)
 #define  PMCR_RX_FC_EN			BIT(4)
 #define  PMCR_FORCE_SPEED_1000		BIT(3)
@@ -288,7 +290,17 @@ enum mt7530_vlan_port_attr {
 					 PMCR_TX_EN | PMCR_RX_EN | \
 					 PMCR_TX_FC_EN | PMCR_RX_FC_EN | \
 					 PMCR_FORCE_SPEED_1000 | \
-					 PMCR_FORCE_FDX | PMCR_FORCE_LNK)
+					 PMCR_FORCE_FDX | PMCR_FORCE_LNK | \
+					 PMCR_FORCE_EEE1G | PMCR_FORCE_EEE100)
+
+#define MT7530_PMEEECR_P(x)		(0x3004 + (x) * 0x100)
+#define  WAKEUP_TIME_1000(x)		(((x) & 0xFF) << 24)
+#define  WAKEUP_TIME_100(x)		(((x) & 0xFF) << 16)
+#define  LPI_THRESH_MASK		GENMASK(15, 4)
+#define  LPI_THRESH_SHT			4
+#define  SET_LPI_THRESH(x)		(((x) << LPI_THRESH_SHT) & LPI_THRESH_MASK)
+#define  GET_LPI_THRESH(x)		(((x) & LPI_THRESH_MASK) >> LPI_THRESH_SHT)
+#define  LPI_MODE_EN			BIT(0)
 
 #define MT7530_PMSR_P(x)		(0x3008 + (x) * 0x100)
 #define  PMSR_EEE1G			BIT(7)
@@ -761,6 +773,7 @@ struct mt753x_info {
  *			registers
  * @p6_interface	Holding the current port 6 interface
  * @p5_intf_sel:	Holding the current port 5 interface select
+ * @eee_disabled:	Holding the current eee user disabled bits
  */
 struct mt7530_priv {
 	struct device		*dev;
@@ -778,6 +791,7 @@ struct mt7530_priv {
 	unsigned int		p5_intf_sel;
 	u8			mirror_rx;
 	u8			mirror_tx;
+	u8			eee_disabled;
 
 	struct mt7530_port	ports[MT7530_NUM_PORTS];
 	/* protect among processes for registers access*/
-- 
2.30.2