net: dsa: b53: Add helper to set link parameters

Extract the logic from b53_adjust_link() responsible for overriding a
given port's link, speed, duplex and pause settings and make two helper
functions to set the port's configuration and the port's link settings.
We will make use of both, as separate functions while adding PHYLINK
support next.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/b53/b53_common.c

@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/platform_data/b53.h>
 #include <linux/phy.h>
+#include <linux/phylink.h>
 #include <linux/etherdevice.h>
 #include <linux/if_bridge.h>
 #include <net/dsa.h>
@@ -947,33 +948,50 @@ static int b53_setup(struct dsa_switch *ds)
 	return ret;
 }
 
-static void b53_adjust_link(struct dsa_switch *ds, int port,
-			    struct phy_device *phydev)
+static void b53_force_link(struct b53_device *dev, int port, int link)
 {
-	struct b53_device *dev = ds->priv;
-	struct ethtool_eee *p = &dev->ports[port].eee;
-	u8 rgmii_ctrl = 0, reg = 0, off;
-
-	if (!phy_is_pseudo_fixed_link(phydev))
-		return;
+	u8 reg, val, off;
 
 	/* Override the port settings */
 	if (port == dev->cpu_port) {
 		off = B53_PORT_OVERRIDE_CTRL;
-		reg = PORT_OVERRIDE_EN;
+		val = PORT_OVERRIDE_EN;
 	} else {
 		off = B53_GMII_PORT_OVERRIDE_CTRL(port);
-		reg = GMII_PO_EN;
+		val = GMII_PO_EN;
 	}
 
-	/* Set the link UP */
-	if (phydev->link)
+	b53_read8(dev, B53_CTRL_PAGE, off, &reg);
+	reg |= val;
+	if (link)
 		reg |= PORT_OVERRIDE_LINK;
+	else
+		reg &= ~PORT_OVERRIDE_LINK;
+	b53_write8(dev, B53_CTRL_PAGE, off, reg);
+}
+
+static void b53_force_port_config(struct b53_device *dev, int port,
+				  int speed, int duplex, int pause)
+{
+	u8 reg, val, off;
+
+	/* Override the port settings */
+	if (port == dev->cpu_port) {
+		off = B53_PORT_OVERRIDE_CTRL;
+		val = PORT_OVERRIDE_EN;
+	} else {
+		off = B53_GMII_PORT_OVERRIDE_CTRL(port);
+		val = GMII_PO_EN;
+	}
 
-	if (phydev->duplex == DUPLEX_FULL)
+	b53_read8(dev, B53_CTRL_PAGE, off, &reg);
+	reg |= val;
+	if (duplex == DUPLEX_FULL)
 		reg |= PORT_OVERRIDE_FULL_DUPLEX;
+	else
+		reg &= ~PORT_OVERRIDE_FULL_DUPLEX;
 
-	switch (phydev->speed) {
+	switch (speed) {
 	case 2000:
 		reg |= PORT_OVERRIDE_SPEED_2000M;
 		/* fallthrough */
@@ -987,21 +1005,41 @@ static void b53_adjust_link(struct dsa_switch *ds, int port,
 		reg |= PORT_OVERRIDE_SPEED_10M;
 		break;
 	default:
-		dev_err(ds->dev, "unknown speed: %d\n", phydev->speed);
+		dev_err(dev->dev, "unknown speed: %d\n", speed);
 		return;
 	}
 
+	if (pause & MLO_PAUSE_RX)
+		reg |= PORT_OVERRIDE_RX_FLOW;
+	if (pause & MLO_PAUSE_TX)
+		reg |= PORT_OVERRIDE_TX_FLOW;
+
+	b53_write8(dev, B53_CTRL_PAGE, off, reg);
+}
+
+static void b53_adjust_link(struct dsa_switch *ds, int port,
+			    struct phy_device *phydev)
+{
+	struct b53_device *dev = ds->priv;
+	struct ethtool_eee *p = &dev->ports[port].eee;
+	u8 rgmii_ctrl = 0, reg = 0, off;
+	int pause;
+
+	if (!phy_is_pseudo_fixed_link(phydev))
+		return;
+
 	/* Enable flow control on BCM5301x's CPU port */
 	if (is5301x(dev) && port == dev->cpu_port)
-		reg |= PORT_OVERRIDE_RX_FLOW | PORT_OVERRIDE_TX_FLOW;
+		pause = MLO_PAUSE_TXRX_MASK;
 
 	if (phydev->pause) {
 		if (phydev->asym_pause)
-			reg |= PORT_OVERRIDE_TX_FLOW;
-		reg |= PORT_OVERRIDE_RX_FLOW;
+			pause |= MLO_PAUSE_TX;
+		pause |= MLO_PAUSE_RX;
 	}
 
-	b53_write8(dev, B53_CTRL_PAGE, off, reg);
+	b53_force_port_config(dev, port, phydev->speed, phydev->duplex, pause);
+	b53_force_link(dev, port, phydev->link);
 
 	if (is531x5(dev) && phy_interface_is_rgmii(phydev)) {
 		if (port == 8)
@@ -1061,16 +1099,9 @@ static void b53_adjust_link(struct dsa_switch *ds, int port,
 		}
 	} else if (is5301x(dev)) {
 		if (port != dev->cpu_port) {
-			u8 po_reg = B53_GMII_PORT_OVERRIDE_CTRL(dev->cpu_port);
-			u8 gmii_po;
-
-			b53_read8(dev, B53_CTRL_PAGE, po_reg, &gmii_po);
-			gmii_po |= GMII_PO_LINK |
-				   GMII_PO_RX_FLOW |
-				   GMII_PO_TX_FLOW |
-				   GMII_PO_EN |
-				   GMII_PO_SPEED_2000M;
-			b53_write8(dev, B53_CTRL_PAGE, po_reg, gmii_po);
+			b53_force_port_config(dev, dev->cpu_port, 2000,
+					      DUPLEX_FULL, MLO_PAUSE_TXRX_MASK);
+			b53_force_link(dev, dev->cpu_port, 1);
 		}
 	}