netdev - [PATCH 5/8] net: ethernet: ti: am65-cpsw: Add support for fixed-link configuration

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Date:   Wed, 14 Sep 2022 15:20:50 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <linux@...linux.org.uk>,
        <vladimir.oltean@....com>, <grygorii.strashko@...com>,
        <vigneshr@...com>, <nsekhar@...com>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kishon@...com>,
        <s-vadapalli@...com>
Subject: [PATCH 5/8] net: ethernet: ti: am65-cpsw: Add support for fixed-link configuration

Check for fixed-link in am65_cpsw_nuss_mac_config() using struct
am65_cpsw_slave_data's phy_node property to obtain fwnode. Since
am65_cpsw_nuss_mac_link_up() is not invoked in fixed-link mode, perform
the relevant operations in am65_cpsw_nuss_mac_config() itself.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 40 ++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 72b1df12f320..1739c389af20 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1494,10 +1494,50 @@ static void am65_cpsw_nuss_mac_config(struct phylink_config *config, unsigned in
 							  phylink_config);
 	struct am65_cpsw_port *port = container_of(slave, struct am65_cpsw_port, slave);
 	struct am65_cpsw_common *common = port->common;
+	struct fwnode_handle *fwnode;
+	bool fixed_link = false;
 
 	if (common->pdata.extra_modes & BIT(state->interface))
 		writel(AM65_CPSW_SGMII_CONTROL_MR_AN_ENABLE,
 		       port->sgmii_base + AM65_CPSW_SGMII_CONTROL_REG);
+
+	/* Detecting fixed-link */
+	fwnode = of_node_to_fwnode(port->slave.phy_node);
+	if (fwnode)
+		fixed_link = !!fwnode_get_named_child_node(fwnode, "fixed-link");
+
+	if (fixed_link) {
+		/* In fixed-link mode, mac_link_up is not invoked.
+		 * Therefore, the relevant mac_link_up operations
+		 * have to be moved to mac_config.
+		 */
+		am65_cpsw_nuss_mac_control(port, state->interface, state->speed,
+					   state->duplex, state->pause & MLO_PAUSE_TX,
+					   state->pause & MLO_PAUSE_RX);
+
+		if (state->speed == SPEED_1000)
+			mr_adv_ability |= MAC2MAC_MR_ADV_ABILITY_1G;
+		if (state->speed == SPEED_100)
+			mr_adv_ability |= MAC2MAC_MR_ADV_ABILITY_100M;
+		if (state->duplex)
+			mr_adv_ability |= MAC2MAC_MR_ADV_ABILITY_FULLDUPLEX;
+
+		if (state->interface == PHY_INTERFACE_MODE_SGMII &&
+		    (common->pdata.extra_modes & BIT(state->interface))) {
+			writel(mr_adv_ability,
+			       port->sgmii_base + AM65_CPSW_SGMII_MR_ADV_ABILITY_REG);
+			writel((AM65_CPSW_SGMII_CONTROL_MASTER_MODE |
+			       AM65_CPSW_SGMII_CONTROL_MR_AN_ENABLE),
+			       port->sgmii_base + AM65_CPSW_SGMII_CONTROL_REG);
+		}
+
+		am65_cpsw_nuss_mac_enable_link(port, state->speed, state->duplex);
+	} else {
+		if (state->interface == PHY_INTERFACE_MODE_SGMII &&
+		    (common->pdata.extra_modes & BIT(state->interface)))
+			writel(MAC2PHY_MR_ADV_ABILITY,
+			       port->sgmii_base + AM65_CPSW_SGMII_MR_ADV_ABILITY_REG);
+	}
 }
 
 static void am65_cpsw_nuss_mac_link_down(struct phylink_config *config, unsigned int mode,
-- 
2.25.1