linux-kernel - [PATCH net-next v5] net: stmmac: dwmac-qcom-ethqos: Add support for 2.5G SGMII

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Message-Id: <20240220050735.29507-1-quic_snehshah@quicinc.com>
Date: Tue, 20 Feb 2024 10:37:35 +0530
From: Sneh Shah <quic_snehshah@...cinc.com>
To: Vinod Koul <vkoul@...nel.org>, Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Sneh Shah <quic_snehshah@...cinc.com>, kernel@...cinc.com,
        Andrew Halaney <ahalaney@...hat.com>
Subject: [PATCH net-next v5] net: stmmac: dwmac-qcom-ethqos: Add support for 2.5G SGMII

Serdes phy needs to operate at 2500 mode for 2.5G speed and 1000
mode for 1G/100M/10M speed.
Added changes to configure serdes phy and mac based on link speed.
Changing serdes phy speed involves multiple register writes for
serdes block. To avoid redundant write operations only update serdes
phy when new speed is different.
For 2500 speed MAC PCS autoneg needs to disabled. Added changes to
disable MAC PCS autoneg if ANE parameter is not set.

Signed-off-by: Sneh Shah <quic_snehshah@...cinc.com>
---
v5 changelog:
- Updated commit message with more details on MAC PCS autoneg disable
v4 changelog:
- Made cosmetic changes
v3 changelog:
- updated commit message
---
v2 changelog:
- updated stmmac_pcs_ane to support autoneg disable
- Update serdes speed to 1000 for 100M and 10M also---
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 26 +++++++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_pcs.h  |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 31631e3f89d0..6bbdbb7bef44 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -106,6 +106,7 @@ struct qcom_ethqos {
 	struct clk *link_clk;
 	struct phy *serdes_phy;
 	unsigned int speed;
+	int serdes_speed;
 	phy_interface_t phy_mode;
 
 	const struct ethqos_emac_por *por;
@@ -606,19 +607,39 @@ static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos)
  */
 static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
 {
+	struct net_device *dev = platform_get_drvdata(ethqos->pdev);
+	struct stmmac_priv *priv = netdev_priv(dev);
 	int val;
 
 	val = readl(ethqos->mac_base + MAC_CTRL_REG);
 
 	switch (ethqos->speed) {
+	case SPEED_2500:
+		val &= ~ETHQOS_MAC_CTRL_PORT_SEL;
+		rgmii_updatel(ethqos, RGMII_CONFIG2_RGMII_CLK_SEL_CFG,
+			      RGMII_CONFIG2_RGMII_CLK_SEL_CFG,
+			      RGMII_IO_MACRO_CONFIG2);
+		if (ethqos->serdes_speed != SPEED_2500)
+			phy_set_speed(ethqos->serdes_phy, SPEED_2500);
+		ethqos->serdes_speed = SPEED_2500;
+		stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 0, 0, 0);
+		break;
 	case SPEED_1000:
 		val &= ~ETHQOS_MAC_CTRL_PORT_SEL;
 		rgmii_updatel(ethqos, RGMII_CONFIG2_RGMII_CLK_SEL_CFG,
 			      RGMII_CONFIG2_RGMII_CLK_SEL_CFG,
 			      RGMII_IO_MACRO_CONFIG2);
+		if (ethqos->serdes_speed != SPEED_1000)
+			phy_set_speed(ethqos->serdes_phy, SPEED_1000);
+		ethqos->serdes_speed = SPEED_1000;
+		stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 1, 0, 0);
 		break;
 	case SPEED_100:
 		val |= ETHQOS_MAC_CTRL_PORT_SEL | ETHQOS_MAC_CTRL_SPEED_MODE;
+		if (ethqos->serdes_speed != SPEED_1000)
+			phy_set_speed(ethqos->serdes_phy, SPEED_1000);
+		ethqos->serdes_speed = SPEED_1000;
+		stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 1, 0, 0);
 		break;
 	case SPEED_10:
 		val |= ETHQOS_MAC_CTRL_PORT_SEL;
@@ -627,6 +648,10 @@ static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
 			      FIELD_PREP(RGMII_CONFIG_SGMII_CLK_DVDR,
 					 SGMII_10M_RX_CLK_DVDR),
 			      RGMII_IO_MACRO_CONFIG);
+		if (ethqos->serdes_speed != SPEED_1000)
+			phy_set_speed(ethqos->serdes_phy, ethqos->speed);
+		ethqos->serdes_speed = SPEED_1000;
+		stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 1, 0, 0);
 		break;
 	}
 
@@ -799,6 +824,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 				     "Failed to get serdes phy\n");
 
 	ethqos->speed = SPEED_1000;
+	ethqos->serdes_speed = SPEED_1000;
 	ethqos_update_link_clk(ethqos, SPEED_1000);
 	ethqos_set_func_clk_en(ethqos);
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h
index aefc121464b5..13a30e6df4c1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h
@@ -110,6 +110,8 @@ static inline void dwmac_ctrl_ane(void __iomem *ioaddr, u32 reg, bool ane,
 	/* Enable and restart the Auto-Negotiation */
 	if (ane)
 		value |= GMAC_AN_CTRL_ANE | GMAC_AN_CTRL_RAN;
+	else
+		value &= ~GMAC_AN_CTRL_ANE;
 
 	/* In case of MAC-2-MAC connection, block is configured to operate
 	 * according to MAC conf register.
-- 
2.17.1