netdev - [PATCH RFC V2 4/6] net: bcmgenet: Refactor register access in bcmgenet_mii

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Date:   Sat,  2 Nov 2019 14:41:31 +0100
From:   Stefan Wahren <wahrenst@....net>
To:     Matthias Brugger <matthias.bgg@...nel.org>,
        Matthias Brugger <mbrugger@...e.com>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     Eric Anholt <eric@...olt.net>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Doug Berger <opendmb@...il.com>, netdev@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org,
        Stefan Wahren <wahrenst@....net>
Subject: [PATCH RFC V2 4/6] net: bcmgenet: Refactor register access in bcmgenet_mii_config

The register access in bcmgenet_mii_config() is a little bit opaque and
not easy to extend. In preparation for the missing RGMII PHY modes
move the real register access to the end of the function. This make
the code easier to read and extend.

Signed-off-by: Stefan Wahren <wahrenst@....net>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 41 ++++++++++++----------------
 1 file changed, 18 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 17bb8d6..8f7b2c0 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -223,9 +223,6 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 	u32 port_ctrl;
 	u32 reg;

-	priv->ext_phy = !priv->internal_phy &&
-			(priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
-
 	switch (priv->phy_interface) {
 	case PHY_INTERFACE_MODE_INTERNAL:
 	case PHY_INTERFACE_MODE_MOCA:
@@ -238,22 +235,12 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 			port_ctrl = PORT_MODE_INT_GPHY;
 		else
 			port_ctrl = PORT_MODE_INT_EPHY;
-
-		bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
-
-		if (priv->internal_phy) {
-			phy_name = "internal PHY";
-		} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
-			phy_name = "MoCA";
-			bcmgenet_moca_phy_setup(priv);
-		}
 		break;

 	case PHY_INTERFACE_MODE_MII:
 		phy_name = "external MII";
 		phy_set_max_speed(phydev, SPEED_100);
-		bcmgenet_sys_writel(priv,
-				    PORT_MODE_EXT_EPHY, SYS_PORT_CTRL);
+		port_ctrl = PORT_MODE_EXT_EPHY;
 		break;

 	case PHY_INTERFACE_MODE_REVMII:
@@ -268,31 +255,34 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 			port_ctrl = PORT_MODE_EXT_RVMII_50;
 		else
 			port_ctrl = PORT_MODE_EXT_RVMII_25;
-		bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
 		break;

 	case PHY_INTERFACE_MODE_RGMII:
 		/* RGMII_NO_ID: TXC transitions at the same time as TXD
 		 *		(requires PCB or receiver-side delay)
-		 * RGMII:	Add 2ns delay on TXC (90 degree shift)
 		 *
 		 * ID is implicitly disabled for 100Mbps (RG)MII operation.
 		 */
+		phy_name = "external RGMII (no delay)";
 		id_mode_dis = BIT(16);
-		/* fall through */
+		port_ctrl = PORT_MODE_EXT_GPHY;
+		break;
+
 	case PHY_INTERFACE_MODE_RGMII_TXID:
-		if (id_mode_dis)
-			phy_name = "external RGMII (no delay)";
-		else
-			phy_name = "external RGMII (TX delay)";
-		bcmgenet_sys_writel(priv,
-				    PORT_MODE_EXT_GPHY, SYS_PORT_CTRL);
+		/* RGMII_TXID:	Add 2ns delay on TXC (90 degree shift) */
+		phy_name = "external RGMII (TX delay)";
+		port_ctrl = PORT_MODE_EXT_GPHY;
 		break;
 	default:
 		dev_err(kdev, "unknown phy mode: %d\n", priv->phy_interface);
 		return -EINVAL;
 	}

+	bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
+
+	priv->ext_phy = !priv->internal_phy &&
+			(priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
+
 	/* This is an external PHY (xMII), so we need to enable the RGMII
 	 * block for the interface to work
 	 */
@@ -304,6 +294,11 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 		else
 			reg |= RGMII_MODE_EN;
 		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
+	} else if (priv->internal_phy) {
+		phy_name = "internal PHY";
+	} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
+		phy_name = "MoCA";
+		bcmgenet_moca_phy_setup(priv);
 	}

 	if (init) {
--
2.7.4