[PATCH 2/6] net: ti: am65-cpsw-nuss: Add support for SGMII mode

[Siddharth Vadapalli]

Add support for configuring the CPSW Ethernet Switch in SGMII mode.

Signed-off-by: Siddharth Vadapalli <s-vadapalli at ti.com>
---
 drivers/net/ti/am65-cpsw-nuss.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/net/ti/am65-cpsw-nuss.c b/drivers/net/ti/am65-cpsw-nuss.c
index 523a4c9f91..403de3ea25 100644
--- a/drivers/net/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ti/am65-cpsw-nuss.c
@@ -54,6 +54,12 @@
 #define AM65_CPSW_PN_REG_SA_L			0x308
 #define AM65_CPSW_PN_REG_SA_H			0x30c
 
+#define AM65_CPSW_SGMII_CONTROL_REG             0x010
+#define AM65_CPSW_SGMII_MR_ADV_ABILITY_REG      0x018
+#define AM65_CPSW_SGMII_CONTROL_MR_AN_ENABLE    BIT(0)
+
+#define ADVERTISE_SGMII				0x1
+
 #define AM65_CPSW_ALE_CTL_REG			0x8
 #define AM65_CPSW_ALE_CTL_REG_ENABLE		BIT(31)
 #define AM65_CPSW_ALE_CTL_REG_RESET_TBL		BIT(30)
@@ -89,6 +95,7 @@
 
 struct am65_cpsw_port {
 	fdt_addr_t	port_base;
+	fdt_addr_t	port_sgmii_base;
 	fdt_addr_t	macsl_base;
 	bool		disabled;
 	u32		mac_control;
@@ -203,6 +210,8 @@ static int am65_cpsw_update_link(struct am65_cpsw_priv *priv)
 			mac_control |= AM65_CPSW_MACSL_CTL_REG_FULL_DUPLEX;
 		if (phy->speed == 100)
 			mac_control |= AM65_CPSW_MACSL_CTL_REG_IFCTL_A;
+		if (phy->interface == PHY_INTERFACE_MODE_SGMII)
+			mac_control |= AM65_CPSW_MACSL_CTL_EXT_EN;
 	}
 
 	if (mac_control == port->mac_control)
@@ -228,6 +237,7 @@ out:
 #define AM65_GMII_SEL_MODE_MII		0
 #define AM65_GMII_SEL_MODE_RMII		1
 #define AM65_GMII_SEL_MODE_RGMII	2
+#define AM65_GMII_SEL_MODE_SGMII	3
 
 #define AM65_GMII_SEL_RGMII_IDMODE	BIT(4)
 
@@ -260,6 +270,10 @@ static void am65_cpsw_gmii_sel_k3(struct am65_cpsw_priv *priv,
 		rgmii_id = true;
 		break;
 
+	case PHY_INTERFACE_MODE_SGMII:
+		mode = AM65_GMII_SEL_MODE_SGMII;
+		break;
+
 	default:
 		dev_warn(common->dev,
 			 "Unsupported PHY mode: %u. Defaulting to MII.\n",
@@ -396,6 +410,13 @@ static int am65_cpsw_start(struct udevice *dev)
 		goto err_dis_rx;
 	}
 
+	if (priv->phydev->interface == PHY_INTERFACE_MODE_SGMII) {
+		writel(ADVERTISE_SGMII,
+		       port->port_sgmii_base + AM65_CPSW_SGMII_MR_ADV_ABILITY_REG);
+		writel(AM65_CPSW_SGMII_CONTROL_MR_AN_ENABLE,
+		       port->port_sgmii_base + AM65_CPSW_SGMII_CONTROL_REG);
+	}
+
 	ret = phy_startup(priv->phydev);
 	if (ret) {
 		dev_err(dev, "phy_startup failed\n");
@@ -779,6 +800,8 @@ static int am65_cpsw_probe_nuss(struct udevice *dev)
 		port->port_base = cpsw_common->cpsw_base +
 				  AM65_CPSW_CPSW_NU_PORTS_OFFSET +
 				  (i * AM65_CPSW_CPSW_NU_PORTS_OFFSET);
+		port->port_sgmii_base = cpsw_common->ss_base +
+					AM65_CPSW_SGMII_BASE * (i);
 		port->macsl_base = port->port_base +
 				   AM65_CPSW_CPSW_NU_PORT_MACSL_OFFSET;
 	}
-- 
2.34.1