stmmac: initial support to manage pcs modes

This patch adds the minimal support to manage the PCS
modes (RGMII/SGMII) and restart the ANE.
Both TBI and RTBI are not yet supported.

Thanks to Byungho that wrote some part of this code
and tested SGMII too.

The only thing to be fixed is the get/set pause in
ethtool.

Signed-off-by: Byungho An <bh74.an@samsung.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 46 insertions, 12 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ca3e95a4b16..ac166be325e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -405,6 +405,24 @@ static void stmmac_adjust_link(struct net_device *dev)
 	DBG(probe, DEBUG, "stmmac_adjust_link: exiting\n");
 }
 
+static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
+{
+	int interface = priv->plat->interface;
+
+	if (priv->dma_cap.pcs) {
+		if ((interface & PHY_INTERFACE_MODE_RGMII) ||
+		    (interface & PHY_INTERFACE_MODE_RGMII_ID) ||
+		    (interface & PHY_INTERFACE_MODE_RGMII_RXID) ||
+		    (interface & PHY_INTERFACE_MODE_RGMII_TXID)) {
+			pr_debug("STMMAC: PCS RGMII support enable\n");
+			priv->pcs = STMMAC_PCS_RGMII;
+		} else if (interface & PHY_INTERFACE_MODE_SGMII) {
+			pr_debug("STMMAC: PCS SGMII support enable\n");
+			priv->pcs = STMMAC_PCS_SGMII;
+		}
+	}
+}
+
 /**
  * stmmac_init_phy - PHY initialization
  * @dev: net device structure
@@ -1141,10 +1159,13 @@ static int stmmac_open(struct net_device *dev)
 
 	stmmac_check_ether_addr(priv);
 
-	ret = stmmac_init_phy(dev);
-	if (unlikely(ret)) {
-		pr_err("%s: Cannot attach to PHY (error: %d)\n", __func__, ret);
-		goto open_error;
+	if (!priv->pcs) {
+		ret = stmmac_init_phy(dev);
+		if (ret) {
+			pr_err("%s: Cannot attach to PHY (error: %d)\n",
+			       __func__, ret);
+			goto open_error;
+		}
 	}
 
 	/* Create and initialize the TX/RX descriptors chains. */
@@ -1233,7 +1254,12 @@ static int stmmac_open(struct net_device *dev)
 		phy_start(priv->phydev);
 
 	priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS_TIMER;
-	priv->eee_enabled = stmmac_eee_init(priv);
+
+	/* Using PCS we cannot dial with the phy registers at this stage
+	 * so we do not support extra feature like EEE.
+	 */
+	if (!priv->pcs)
+		priv->eee_enabled = stmmac_eee_init(priv);
 
 	stmmac_init_tx_coalesce(priv);
 
@@ -1242,6 +1268,9 @@ static int stmmac_open(struct net_device *dev)
 		priv->hw->dma->rx_watchdog(priv->ioaddr, MAX_DMA_RIWT);
 	}
 
+	if (priv->pcs && priv->hw->mac->ctrl_ane)
+		priv->hw->mac->ctrl_ane(priv->ioaddr, 0);
+
 	napi_enable(&priv->napi);
 	netif_start_queue(dev);
 
@@ -2225,12 +2254,16 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
 	else
 		priv->clk_csr = priv->plat->clk_csr;
 
-	/* MDIO bus Registration */
-	ret = stmmac_mdio_register(ndev);
-	if (ret < 0) {
-		pr_debug("%s: MDIO bus (id: %d) registration failed",
-			 __func__, priv->plat->bus_id);
-		goto error_mdio_register;
+	stmmac_check_pcs_mode(priv);
+
+	if (!priv->pcs) {
+		/* MDIO bus Registration */
+		ret = stmmac_mdio_register(ndev);
+		if (ret < 0) {
+			pr_debug("%s: MDIO bus (id: %d) registration failed",
+				 __func__, priv->plat->bus_id);
+			goto error_mdio_register;
+		}
 	}
 
 	return priv;
@@ -2263,7 +2296,8 @@ int stmmac_dvr_remove(struct net_device *ndev)
 	priv->hw->dma->stop_tx(priv->ioaddr);
 
 	stmmac_set_mac(priv->ioaddr, false);
-	stmmac_mdio_unregister(ndev);
+	if (!priv->pcs)
+		stmmac_mdio_unregister(ndev);
 	netif_carrier_off(ndev);
 	unregister_netdev(ndev);
 	free_netdev(ndev);