Merge branch 'dsa-mv88e6xxx-remove-Global-2-setup'

Vivien Didelot says:

====================
net: dsa: mv88e6xxx: remove Global 2 setup

Parts of the mv88e6xxx driver still write arbitrary registers of
different banks at setup time, which is misleading especially when
supporting multiple device models.

This patchset moves two features setup into the top lovel
mv88e6xxx_setup function and kills the old Global 2 register bank setup
function. It brings no functional changes.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -1026,6 +1026,38 @@ static void mv88e6xxx_port_stp_state_set(struct dsa_switch *ds, int port,
 		dev_err(ds->dev, "p%d: failed to update state\n", port);
 }
 
+static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
+{
+	int target, port;
+	int err;
+
+	if (!chip->info->global2_addr)
+		return 0;
+
+	/* Initialize the routing port to the 32 possible target devices */
+	for (target = 0; target < 32; target++) {
+		port = 0x1f;
+		if (target < DSA_MAX_SWITCHES)
+			if (chip->ds->rtable[target] != DSA_RTABLE_NONE)
+				port = chip->ds->rtable[target];
+
+		err = mv88e6xxx_g2_device_mapping_write(chip, target, port);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int mv88e6xxx_trunk_setup(struct mv88e6xxx_chip *chip)
+{
+	/* Clear all trunk masks and mapping */
+	if (chip->info->global2_addr)
+		return mv88e6xxx_g2_trunk_clear(chip);
+
+	return 0;
+}
+
 static int mv88e6xxx_pot_setup(struct mv88e6xxx_chip *chip)
 {
 	if (chip->info->ops->pot_clear)
@@ -2196,13 +2228,6 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 	if (err)
 		goto unlock;
 
-	/* Setup Switch Global 2 Registers */
-	if (chip->info->global2_addr) {
-		err = mv88e6xxx_g2_setup(chip);
-		if (err)
-			goto unlock;
-	}
-
 	err = mv88e6xxx_irl_setup(chip);
 	if (err)
 		goto unlock;
@@ -2239,6 +2264,14 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 	if (err)
 		goto unlock;
 
+	err = mv88e6xxx_trunk_setup(chip);
+	if (err)
+		goto unlock;
+
+	err = mv88e6xxx_devmap_setup(chip);
+	if (err)
+		goto unlock;
+
 	/* Setup PTP Hardware Clock and timestamping */
 	if (chip->info->ptp_support) {
 		err = mv88e6xxx_ptp_setup(chip);

drivers/net/dsa/mv88e6xxx/global2.c

@@ -119,37 +119,17 @@ int mv88e6352_g2_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip)
 
 /* Offset 0x06: Device Mapping Table register */
 
-static int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip,
-					     int target, int port)
+int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target,
+				      int port)
 {
-	u16 val = (target << 8) | (port & 0xf);
+	u16 val = (target << 8) | (port & 0x1f);
+	/* Modern chips use 5 bits to define a device mapping port,
+	 * but bit 4 is reserved on older chips, so it is safe to use.
+	 */
 
 	return mv88e6xxx_g2_update(chip, MV88E6XXX_G2_DEVICE_MAPPING, val);
 }
 
-static int mv88e6xxx_g2_set_device_mapping(struct mv88e6xxx_chip *chip)
-{
-	int target, port;
-	int err;
-
-	/* Initialize the routing port to the 32 possible target devices */
-	for (target = 0; target < 32; ++target) {
-		port = 0xf;
-
-		if (target < DSA_MAX_SWITCHES) {
-			port = chip->ds->rtable[target];
-			if (port == DSA_RTABLE_NONE)
-				port = 0xf;
-		}
-
-		err = mv88e6xxx_g2_device_mapping_write(chip, target, port);
-		if (err)
-			break;
-	}
-
-	return err;
-}
-
 /* Offset 0x07: Trunk Mask Table register */
 
 static int mv88e6xxx_g2_trunk_mask_write(struct mv88e6xxx_chip *chip, int num,
@@ -174,7 +154,7 @@ static int mv88e6xxx_g2_trunk_mapping_write(struct mv88e6xxx_chip *chip, int id,
 	return mv88e6xxx_g2_update(chip, MV88E6XXX_G2_TRUNK_MAPPING, val);
 }
 
-static int mv88e6xxx_g2_clear_trunk(struct mv88e6xxx_chip *chip)
+int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip)
 {
 	const u16 port_mask = BIT(mv88e6xxx_num_ports(chip)) - 1;
 	int i, err;
@@ -1138,31 +1118,3 @@ void mv88e6xxx_g2_irq_mdio_free(struct mv88e6xxx_chip *chip,
 	for (phy = 0; phy < chip->info->num_internal_phys; phy++)
 		irq_dispose_mapping(bus->irq[phy]);
 }
-
-int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
-{
-	u16 reg;
-	int err;
-
-	/* Ignore removed tag data on doubly tagged packets, disable
-	 * flow control messages, force flow control priority to the
-	 * highest, and send all special multicast frames to the CPU
-	 * port at the highest priority.
-	 */
-	reg = MV88E6XXX_G2_SWITCH_MGMT_FORCE_FLOW_CTL_PRI | (0x7 << 4);
-	err = mv88e6xxx_g2_write(chip, MV88E6XXX_G2_SWITCH_MGMT, reg);
-	if (err)
-		return err;
-
-	/* Program the DSA routing table. */
-	err = mv88e6xxx_g2_set_device_mapping(chip);
-	if (err)
-		return err;
-
-	/* Clear all trunk masks and mapping. */
-	err = mv88e6xxx_g2_clear_trunk(chip);
-	if (err)
-		return err;
-
-	return 0;
-}

drivers/net/dsa/mv88e6xxx/global2.h

@@ -60,7 +60,8 @@
 #define MV88E6XXX_G2_DEVICE_MAPPING		0x06
 #define MV88E6XXX_G2_DEVICE_MAPPING_UPDATE	0x8000
 #define MV88E6XXX_G2_DEVICE_MAPPING_DEV_MASK	0x1f00
-#define MV88E6XXX_G2_DEVICE_MAPPING_PORT_MASK	0x000f
+#define MV88E6352_G2_DEVICE_MAPPING_PORT_MASK	0x000f
+#define MV88E6390_G2_DEVICE_MAPPING_PORT_MASK	0x001f
 
 /* Offset 0x07: Trunk Mask Table Register */
 #define MV88E6XXX_G2_TRUNK_MASK			0x07
@@ -313,7 +314,6 @@ int mv88e6xxx_g2_pvt_write(struct mv88e6xxx_chip *chip, int src_dev,
 			   int src_port, u16 data);
 int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip);
 
-int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip);
 int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip);
 void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip);
 
@@ -327,6 +327,11 @@ int mv88e6352_g2_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip);
 
 int mv88e6xxx_g2_pot_clear(struct mv88e6xxx_chip *chip);
 
+int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip);
+
+int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target,
+				      int port);
+
 extern const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops;
 extern const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops;
 
@@ -441,11 +446,6 @@ static inline int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip)
 	return -EOPNOTSUPP;
 }
 
-static inline int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
-{
-	return -EOPNOTSUPP;
-}
-
 static inline int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip)
 {
 	return -EOPNOTSUPP;
@@ -495,6 +495,17 @@ static inline int mv88e6xxx_g2_scratch_gpio_set_smi(struct mv88e6xxx_chip *chip,
 	return -EOPNOTSUPP;
 }
 
+static inline int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip,
+						    int target, int port)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif /* CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
 
 #endif /* _MV88E6XXX_GLOBAL2_H */