netdev - [PATCH net-next 03/13] net: dsa: lantiq_gswip: support Energy Efficient Ethernet

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Message-ID: <5be787b67aadb589a06cf732a8def0284a25237b.1761324950.git.daniel@makrotopia.org>
Date: Fri, 24 Oct 2025 18:01:58 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: Hauke Mehrtens <hauke@...ke-m.de>, Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Andreas Schirm <andreas.schirm@...mens.com>,
	Lukas Stockmann <lukas.stockmann@...mens.com>,
	Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Peter Christen <peter.christen@...mens.com>,
	Avinash Jayaraman <ajayaraman@...linear.com>,
	Bing tao Xu <bxu@...linear.com>, Liang Xu <lxu@...linear.com>,
	Juraj Povazanec <jpovazanec@...linear.com>,
	"Fanni (Fang-Yi) Chan" <fchan@...linear.com>,
	"Benny (Ying-Tsan) Weng" <yweng@...linear.com>,
	"Livia M. Rosu" <lrosu@...linear.com>,
	John Crispin <john@...ozen.org>
Subject: [PATCH net-next 03/13] net: dsa: lantiq_gswip: support Energy
 Efficient Ethernet

Introduce support for Energy Efficient Ethernet (EEE) on hardware
version 2.2 or later.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/dsa/lantiq/lantiq_gswip.h        |  7 +++
 drivers/net/dsa/lantiq/lantiq_gswip_common.c | 47 ++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.h b/drivers/net/dsa/lantiq/lantiq_gswip.h
index fb7d2c02bde9..56de869fc472 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.h
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.h
@@ -2,6 +2,7 @@
 #ifndef __LANTIQ_GSWIP_H
 #define __LANTIQ_GSWIP_H
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/mutex.h>
 #include <linux/phylink.h>
@@ -193,6 +194,12 @@
 #define GSWIP_MAC_CTRL_2p(p)		(0x905 + ((p) * 0xC))
 #define GSWIP_MAC_CTRL_2_LCHKL		BIT(2) /* Frame Length Check Long Enable */
 #define GSWIP_MAC_CTRL_2_MLEN		BIT(3) /* Maximum Untagged Frame Lnegth */
+#define GSWIP_MAC_CTRL_4p(p)		(0x907 + ((p) * 0xC))
+#define  GSWIP_MAC_CTRL_4_LPIEN		BIT(7) /* LPI Mode Enable */
+#define  GSWIP_MAC_CTRL_4_GWAIT_MASK	GENMASK(14, 8) /* LPI Wait Time 1G */
+#define  GSWIP_MAC_CTRL_4_GWAIT(t)	u16_encode_bits((t), GSWIP_MAC_CTRL_4_GWAIT_MASK)
+#define  GSWIP_MAC_CTRL_4_WAIT_MASK	GENMASK(6, 0) /* LPI Wait Time 100M */
+#define  GSWIP_MAC_CTRL_4_WAIT(t)	u16_encode_bits((t), GSWIP_MAC_CTRL_4_WAIT_MASK)
 
 /* Ethernet Switch Fetch DMA Port Control Register */
 #define GSWIP_FDMA_PCTRLp(p)		(0xA80 + ((p) * 0x6))
diff --git a/drivers/net/dsa/lantiq/lantiq_gswip_common.c b/drivers/net/dsa/lantiq/lantiq_gswip_common.c
index 595d4016f6d1..00d4aff96f12 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip_common.c
+++ b/drivers/net/dsa/lantiq/lantiq_gswip_common.c
@@ -1537,6 +1537,49 @@ static int gswip_get_sset_count(struct dsa_switch *ds, int port, int sset)
 	return ARRAY_SIZE(gswip_rmon_cnt);
 }
 
+static int gswip_set_mac_eee(struct dsa_switch *ds, int port,
+			     struct ethtool_keee *e)
+{
+	if (e->tx_lpi_timer > 0x7f)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void gswip_phylink_mac_disable_tx_lpi(struct phylink_config *config)
+{
+	struct dsa_port *dp = dsa_phylink_to_port(config);
+	struct gswip_priv *priv = dp->ds->priv;
+
+	regmap_clear_bits(priv->gswip, GSWIP_MAC_CTRL_4p(dp->index),
+			  GSWIP_MAC_CTRL_4_LPIEN);
+}
+
+static int gswip_phylink_mac_enable_tx_lpi(struct phylink_config *config,
+					   u32 timer, bool tx_clock_stop)
+{
+	struct dsa_port *dp = dsa_phylink_to_port(config);
+	struct gswip_priv *priv = dp->ds->priv;
+
+	return regmap_update_bits(priv->gswip, GSWIP_MAC_CTRL_4p(dp->index),
+				  GSWIP_MAC_CTRL_4_LPIEN |
+				  GSWIP_MAC_CTRL_4_GWAIT_MASK |
+				  GSWIP_MAC_CTRL_4_WAIT_MASK,
+				  GSWIP_MAC_CTRL_4_LPIEN |
+				  GSWIP_MAC_CTRL_4_GWAIT(timer) |
+				  GSWIP_MAC_CTRL_4_WAIT(timer));
+}
+
+static bool gswip_support_eee(struct dsa_switch *ds, int port)
+{
+	struct gswip_priv *priv = ds->priv;
+
+	if (GSWIP_VERSION_GE(priv, GSWIP_VERSION_2_2))
+		return true;
+
+	return false;
+}
+
 static struct phylink_pcs *gswip_phylink_mac_select_pcs(struct phylink_config *config,
 							phy_interface_t interface)
 {
@@ -1553,6 +1596,8 @@ static const struct phylink_mac_ops gswip_phylink_mac_ops = {
 	.mac_config		= gswip_phylink_mac_config,
 	.mac_link_down		= gswip_phylink_mac_link_down,
 	.mac_link_up		= gswip_phylink_mac_link_up,
+	.mac_disable_tx_lpi	= gswip_phylink_mac_disable_tx_lpi,
+	.mac_enable_tx_lpi	= gswip_phylink_mac_enable_tx_lpi,
 	.mac_select_pcs		= gswip_phylink_mac_select_pcs,
 };
 
@@ -1580,6 +1625,8 @@ static const struct dsa_switch_ops gswip_switch_ops = {
 	.get_strings		= gswip_get_strings,
 	.get_ethtool_stats	= gswip_get_ethtool_stats,
 	.get_sset_count		= gswip_get_sset_count,
+	.set_mac_eee		= gswip_set_mac_eee,
+	.support_eee		= gswip_support_eee,
 };
 
 void gswip_disable_switch(struct gswip_priv *priv)
-- 
2.51.0