net: dsa: microchip: lan937x: add phylink_mac_link_up support

This patch add support for phylink_mac_link_up. It configures the mac
for the speed, flow control and duplex mode.
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/ksz_common.c

@@ -221,6 +221,7 @@ static const struct ksz_dev_ops lan937x_dev_ops = {
 	.mirror_add = ksz9477_port_mirror_add,
 	.mirror_del = ksz9477_port_mirror_del,
 	.get_caps = lan937x_phylink_get_caps,
+	.phylink_mac_link_up = lan937x_phylink_mac_link_up,
 	.fdb_dump = ksz9477_fdb_dump,
 	.fdb_add = ksz9477_fdb_add,
 	.fdb_del = ksz9477_fdb_del,
@@ -1340,6 +1341,20 @@ static int ksz_max_mtu(struct dsa_switch *ds, int port)
 	return dev->dev_ops->max_mtu(dev, port);
 }
 
+static void ksz_phylink_mac_link_up(struct dsa_switch *ds, int port,
+				    unsigned int mode,
+				    phy_interface_t interface,
+				    struct phy_device *phydev, int speed,
+				    int duplex, bool tx_pause, bool rx_pause)
+{
+	struct ksz_device *dev = ds->priv;
+
+	if (dev->dev_ops->phylink_mac_link_up)
+		dev->dev_ops->phylink_mac_link_up(dev, port, mode, interface,
+						  phydev, speed, duplex,
+						  tx_pause, rx_pause);
+}
+
 static int ksz_switch_detect(struct ksz_device *dev)
 {
 	u8 id1, id2;
@@ -1413,6 +1428,7 @@ static const struct dsa_switch_ops ksz_switch_ops = {
 	.phy_read		= ksz_phy_read16,
 	.phy_write		= ksz_phy_write16,
 	.phylink_get_caps	= ksz_phylink_get_caps,
+	.phylink_mac_link_up	= ksz_phylink_mac_link_up,
 	.phylink_mac_link_down	= ksz_mac_link_down,
 	.port_enable		= ksz_enable_port,
 	.get_strings		= ksz_get_strings,

drivers/net/dsa/microchip/ksz_common.h

@@ -271,6 +271,11 @@ struct ksz_dev_ops {
 	int (*max_mtu)(struct ksz_device *dev, int port);
 	void (*freeze_mib)(struct ksz_device *dev, int port, bool freeze);
 	void (*port_init_cnt)(struct ksz_device *dev, int port);
+	void (*phylink_mac_link_up)(struct ksz_device *dev, int port,
+				    unsigned int mode,
+				    phy_interface_t interface,
+				    struct phy_device *phydev, int speed,
+				    int duplex, bool tx_pause, bool rx_pause);
 	void (*config_cpu_port)(struct dsa_switch *ds);
 	int (*enable_stp_addr)(struct ksz_device *dev);
 	int (*reset)(struct ksz_device *dev);

drivers/net/dsa/microchip/lan937x.h

@@ -17,4 +17,8 @@ void lan937x_w_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 val);
 int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu);
 void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
 			      struct phylink_config *config);
+void lan937x_phylink_mac_link_up(struct ksz_device *dev, int port,
+				 unsigned int mode, phy_interface_t interface,
+				 struct phy_device *phydev, int speed,
+				 int duplex, bool tx_pause, bool rx_pause);
 #endif

drivers/net/dsa/microchip/lan937x_main.c

@@ -312,6 +312,39 @@ int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu)
 	return 0;
 }
 
+static void lan937x_config_interface(struct ksz_device *dev, int port,
+				     int speed, int duplex,
+				     bool tx_pause, bool rx_pause)
+{
+	u8 xmii_ctrl0, xmii_ctrl1;
+
+	ksz_pread8(dev, port, REG_PORT_XMII_CTRL_0, &xmii_ctrl0);
+	ksz_pread8(dev, port, REG_PORT_XMII_CTRL_1, &xmii_ctrl1);
+
+	xmii_ctrl0 &= ~(PORT_MII_100MBIT | PORT_MII_FULL_DUPLEX |
+			PORT_MII_TX_FLOW_CTRL | PORT_MII_RX_FLOW_CTRL);
+
+	if (speed == SPEED_1000)
+		xmii_ctrl1 &= ~PORT_MII_NOT_1GBIT;
+	else
+		xmii_ctrl1 |= PORT_MII_NOT_1GBIT;
+
+	if (speed == SPEED_100)
+		xmii_ctrl0 |= PORT_MII_100MBIT;
+
+	if (duplex)
+		xmii_ctrl0 |= PORT_MII_FULL_DUPLEX;
+
+	if (tx_pause)
+		xmii_ctrl0 |= PORT_MII_TX_FLOW_CTRL;
+
+	if (rx_pause)
+		xmii_ctrl0 |= PORT_MII_RX_FLOW_CTRL;
+
+	ksz_pwrite8(dev, port, REG_PORT_XMII_CTRL_0, xmii_ctrl0);
+	ksz_pwrite8(dev, port, REG_PORT_XMII_CTRL_1, xmii_ctrl1);
+}
+
 void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
 			      struct phylink_config *config)
 {
@@ -324,6 +357,19 @@ void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
 	}
 }
 
+void lan937x_phylink_mac_link_up(struct ksz_device *dev, int port,
+				 unsigned int mode, phy_interface_t interface,
+				 struct phy_device *phydev, int speed,
+				 int duplex, bool tx_pause, bool rx_pause)
+{
+	/* Internal PHYs */
+	if (dev->info->internal_phy[port])
+		return;
+
+	lan937x_config_interface(dev, port, speed, duplex,
+				 tx_pause, rx_pause);
+}
+
 int lan937x_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;

drivers/net/dsa/microchip/lan937x_reg.h

@@ -139,6 +139,17 @@
 #define PORT_MII_RX_FLOW_CTRL		BIT(3)
 #define PORT_GRXC_ENABLE		BIT(0)
 
+#define REG_PORT_XMII_CTRL_1		0x0301
+#define PORT_MII_NOT_1GBIT		BIT(6)
+#define PORT_MII_SEL_EDGE		BIT(5)
+#define PORT_RGMII_ID_IG_ENABLE		BIT(4)
+#define PORT_RGMII_ID_EG_ENABLE		BIT(3)
+#define PORT_MII_MAC_MODE		BIT(2)
+#define PORT_MII_SEL_M			0x3
+#define PORT_RGMII_SEL			0x0
+#define PORT_RMII_SEL			0x1
+#define PORT_MII_SEL			0x2
+
 /* 4 - MAC */
 #define REG_PORT_MAC_CTRL_0		0x0400
 #define PORT_CHECK_LENGTH		BIT(2)