[net-next PATCH v2 05/10] net: netcp: ethss: use rgmii link status for 2u cpsw hardware

[Murali Karicheri]

Introduce rgmii link status to handle link state events for 2u
cpsw hardware on K2G.

Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx>
---
 drivers/net/ethernet/ti/netcp_ethss.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index ab9d369..078a1b8 100644
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -552,6 +552,7 @@ struct gbe_ss_regs {
 struct gbe_ss_regs_ofs {
 	u16	id_ver;
 	u16	control;
+	u16	rgmii_status; /* 2U */
 };
 
 struct gbe_switch_regs {
@@ -2120,23 +2121,39 @@ static bool gbe_phy_link_status(struct gbe_slave *slave)
 	 return !slave->phy || slave->phy->link;
 }
 
+#define RGMII_REG_STATUS_LINK	BIT(0)
+
+static void netcp_2u_rgmii_get_port_link(struct gbe_priv *gbe_dev, bool *status)
+{
+	u32 val = 0;
+
+	val = readl(GBE_REG_ADDR(gbe_dev, ss_regs, rgmii_status));
+	*status = false;
+	if ((val & RGMII_REG_STATUS_LINK) != 0)
+		*status = true;
+}
+
 static void netcp_ethss_update_link_state(struct gbe_priv *gbe_dev,
 					  struct gbe_slave *slave,
 					  struct net_device *ndev)
 {
-	int sp = slave->slave_num;
-	int phy_link_state, sgmii_link_state = 1, link_state;
+	bool sw_link_state = true, phy_link_state;
+	int sp = slave->slave_num, link_state;
 
 	if (!slave->open)
 		return;
 
 	if (!SLAVE_LINK_IS_XGMII(slave)) {
-		sgmii_link_state =
+		if (SLAVE_LINK_IS_RGMII(slave))
+			netcp_2u_rgmii_get_port_link(gbe_dev,
+						     &sw_link_state);
+		else
+			sw_link_state =
 			netcp_sgmii_get_port_link(SGMII_BASE(gbe_dev, sp), sp);
 	}
 
 	phy_link_state = gbe_phy_link_status(slave);
-	link_state = phy_link_state & sgmii_link_state;
+	link_state = phy_link_state & sw_link_state;
 
 	if (atomic_xchg(&slave->link_state, link_state) != link_state)
 		netcp_ethss_link_state_action(gbe_dev, ndev, slave,
@@ -3432,6 +3449,8 @@ static int set_gbenu_ethss_priv(struct gbe_priv *gbe_dev,
 
 	/* Subsystem registers */
 	GBENU_SET_REG_OFS(gbe_dev, ss_regs, id_ver);
+	/* ok to set for MU, but used by 2U only */
+	GBENU_SET_REG_OFS(gbe_dev, ss_regs, rgmii_status);
 
 	/* Switch module registers */
 	GBENU_SET_REG_OFS(gbe_dev, switch_regs, id_ver);
-- 
1.9.1