net: dsa: mt7530: Add EN7581 support

Introduce support for the DSA built-in switch available on the EN7581
development board. EN7581 support is similar to MT7988 one except
it requires to set MT7530_FORCE_MODE bit in MT753X_PMCR_P register
for on cpu port.
Tested-by: Benjamin Larsson <benjamin.larsson@genexis.eu>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mt7530-mmio.c

@@ -11,6 +11,7 @@
 #include "mt7530.h"
 
 static const struct of_device_id mt7988_of_match[] = {
+	{ .compatible = "airoha,en7581-switch", .data = &mt753x_table[ID_EN7581], },
 	{ .compatible = "mediatek,mt7988-switch", .data = &mt753x_table[ID_MT7988], },
 	{ /* sentinel */ },
 };

drivers/net/dsa/mt7530.c

@@ -1152,7 +1152,8 @@ mt753x_cpu_port_enable(struct dsa_switch *ds, int port)
 	 * the MT7988 SoC. Trapped frames will be forwarded to the CPU port that
 	 * is affine to the inbound user port.
 	 */
-	if (priv->id == ID_MT7531 || priv->id == ID_MT7988)
+	if (priv->id == ID_MT7531 || priv->id == ID_MT7988 ||
+	    priv->id == ID_EN7581)
 		mt7530_set(priv, MT7531_CFC, MT7531_CPU_PMAP(BIT(port)));
 
 	/* CPU port gets connected to all user ports of
@@ -2207,7 +2208,7 @@ mt7530_setup_irq(struct mt7530_priv *priv)
 		return priv->irq ? : -EINVAL;
 	}
 
-	if (priv->id == ID_MT7988)
+	if (priv->id == ID_MT7988 || priv->id == ID_EN7581)
 		priv->irq_domain = irq_domain_add_linear(np, MT7530_NUM_PHYS,
 							 &mt7988_irq_domain_ops,
 							 priv);
@@ -2438,8 +2439,10 @@ mt7530_setup(struct dsa_switch *ds)
 		/* Clear link settings and enable force mode to force link down
 		 * on all ports until they're enabled later.
 		 */
-		mt7530_rmw(priv, MT753X_PMCR_P(i), PMCR_LINK_SETTINGS_MASK |
-			   MT7530_FORCE_MODE, MT7530_FORCE_MODE);
+		mt7530_rmw(priv, MT753X_PMCR_P(i),
+			   PMCR_LINK_SETTINGS_MASK |
+			   MT753X_FORCE_MODE(priv->id),
+			   MT753X_FORCE_MODE(priv->id));
 
 		/* Disable forwarding by default on all ports */
 		mt7530_rmw(priv, MT7530_PCR_P(i), PCR_MATRIX_MASK,
@@ -2550,8 +2553,10 @@ mt7531_setup_common(struct dsa_switch *ds)
 		/* Clear link settings and enable force mode to force link down
 		 * on all ports until they're enabled later.
 		 */
-		mt7530_rmw(priv, MT753X_PMCR_P(i), PMCR_LINK_SETTINGS_MASK |
-			   MT7531_FORCE_MODE_MASK, MT7531_FORCE_MODE_MASK);
+		mt7530_rmw(priv, MT753X_PMCR_P(i),
+			   PMCR_LINK_SETTINGS_MASK |
+			   MT753X_FORCE_MODE(priv->id),
+			   MT753X_FORCE_MODE(priv->id));
 
 		/* Disable forwarding by default on all ports */
 		mt7530_rmw(priv, MT7530_PCR_P(i), PCR_MATRIX_MASK,
@@ -2783,6 +2788,28 @@ static void mt7988_mac_port_get_caps(struct dsa_switch *ds, int port,
 	}
 }
 
+static void en7581_mac_port_get_caps(struct dsa_switch *ds, int port,
+				     struct phylink_config *config)
+{
+	switch (port) {
+	/* Ports which are connected to switch PHYs. There is no MII pinout. */
+	case 0 ... 4:
+		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
+			  config->supported_interfaces);
+
+		config->mac_capabilities |= MAC_10 | MAC_100 | MAC_1000FD;
+		break;
+
+	/* Port 6 is connected to SoC's XGMII MAC. There is no MII pinout. */
+	case 6:
+		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
+			  config->supported_interfaces);
+
+		config->mac_capabilities |= MAC_10000FD;
+		break;
+	}
+}
+
 static void
 mt7530_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 		  phy_interface_t interface)
@@ -3220,6 +3247,16 @@ const struct mt753x_info mt753x_table[] = {
 		.phy_write_c45 = mt7531_ind_c45_phy_write,
 		.mac_port_get_caps = mt7988_mac_port_get_caps,
 	},
+	[ID_EN7581] = {
+		.id = ID_EN7581,
+		.pcs_ops = &mt7530_pcs_ops,
+		.sw_setup = mt7988_setup,
+		.phy_read_c22 = mt7531_ind_c22_phy_read,
+		.phy_write_c22 = mt7531_ind_c22_phy_write,
+		.phy_read_c45 = mt7531_ind_c45_phy_read,
+		.phy_write_c45 = mt7531_ind_c45_phy_write,
+		.mac_port_get_caps = en7581_mac_port_get_caps,
+	},
 };
 EXPORT_SYMBOL_GPL(mt753x_table);
 

drivers/net/dsa/mt7530.h

@@ -19,6 +19,7 @@ enum mt753x_id {
 	ID_MT7621 = 1,
 	ID_MT7531 = 2,
 	ID_MT7988 = 3,
+	ID_EN7581 = 4,
 };
 
 #define	NUM_TRGMII_CTRL			5
@@ -64,25 +65,30 @@ enum mt753x_id {
 #define  MT7531_CPU_PMAP(x)		FIELD_PREP(MT7531_CPU_PMAP_MASK, x)
 
 #define MT753X_MIRROR_REG(id)		((id == ID_MT7531 || \
-					  id == ID_MT7988) ? \
+					  id == ID_MT7988 || \
+					  id == ID_EN7581) ? \
 					 MT7531_CFC : MT753X_MFC)
 
 #define MT753X_MIRROR_EN(id)		((id == ID_MT7531 || \
-					  id == ID_MT7988) ? \
+					  id == ID_MT7988 || \
+					  id == ID_EN7581) ? \
 					 MT7531_MIRROR_EN : MT7530_MIRROR_EN)
 
 #define MT753X_MIRROR_PORT_MASK(id)	((id == ID_MT7531 || \
-					  id == ID_MT7988) ? \
+					  id == ID_MT7988 || \
+					  id == ID_EN7581) ? \
 					 MT7531_MIRROR_PORT_MASK : \
 					 MT7530_MIRROR_PORT_MASK)
 
 #define MT753X_MIRROR_PORT_GET(id, val)	((id == ID_MT7531 || \
-					  id == ID_MT7988) ? \
+					  id == ID_MT7988 || \
+					  id == ID_EN7581) ? \
 					 MT7531_MIRROR_PORT_GET(val) : \
 					 MT7530_MIRROR_PORT_GET(val))
 
 #define MT753X_MIRROR_PORT_SET(id, val)	((id == ID_MT7531 || \
-					  id == ID_MT7988) ? \
+					  id == ID_MT7988 || \
+					  id == ID_EN7581) ? \
 					 MT7531_MIRROR_PORT_SET(val) : \
 					 MT7530_MIRROR_PORT_SET(val))
 
@@ -355,6 +361,10 @@ enum mt7530_vlan_port_acc_frm {
 					 MT7531_FORCE_MODE_TX_FC | \
 					 MT7531_FORCE_MODE_EEE100 | \
 					 MT7531_FORCE_MODE_EEE1G)
+#define  MT753X_FORCE_MODE(id)		((id == ID_MT7531 || \
+					  id == ID_MT7988) ? \
+					 MT7531_FORCE_MODE_MASK : \
+					 MT7530_FORCE_MODE)
 #define  PMCR_LINK_SETTINGS_MASK	(PMCR_MAC_TX_EN | PMCR_MAC_RX_EN | \
 					 PMCR_FORCE_EEE1G | \
 					 PMCR_FORCE_EEE100 | \