net: dsa: mv88e6xxx: set device number

All Marvell switches supported by mv88e6xxx have to set their device
number in the Global Control 2 register. Extract this in a read then
write function, called from the device mapping setup code.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -1053,6 +1053,10 @@ static int mv88e6xxx_devmap_setup(struct mv88e6xxx_chip *chip)
 			return err;
 	}
 
+	err = mv88e6xxx_g1_set_device_number(chip, chip->ds->index);
+	if (err)
+		return err;
+
 	return 0;
 }
 
@@ -2160,15 +2164,8 @@ static int mv88e6xxx_set_ageing_time(struct dsa_switch *ds,
 
 static int mv88e6xxx_g1_setup(struct mv88e6xxx_chip *chip)
 {
-	struct dsa_switch *ds = chip->ds;
 	int err;
 
-	/* Disable remote management, and set the switch's DSA device number. */
-	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL2,
-				 (ds->index & 0x1f));
-	if (err)
-		return err;
-
 	/* Configure the IP ToS mapping registers. */
 	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_0, 0x0000);
 	if (err)

drivers/net/dsa/mv88e6xxx/global1.c

@@ -389,6 +389,13 @@ int mv88e6390_g1_stats_set_histogram(struct mv88e6xxx_chip *chip)
 	return err;
 }
 
+int mv88e6xxx_g1_set_device_number(struct mv88e6xxx_chip *chip, int index)
+{
+	return mv88e6xxx_g1_ctl2_mask(chip,
+				      MV88E6XXX_G1_CTL2_DEVICE_NUMBER_MASK,
+				      index);
+}
+
 /* Offset 0x1d: Statistics Operation 2 */
 
 int mv88e6xxx_g1_stats_wait(struct mv88e6xxx_chip *chip)

drivers/net/dsa/mv88e6xxx/global1.h

@@ -207,6 +207,7 @@
 #define MV88E6185_G1_CTL2_CASCADE_PORT_MASK	0xf000
 #define MV88E6185_G1_CTL2_CASCADE_PORT_NONE	0xe000
 #define MV88E6185_G1_CTL2_CASCADE_PORT_MULTI	0xf000
+#define MV88E6XXX_G1_CTL2_DEVICE_NUMBER_MASK	0x001f
 
 /* Offset 0x1D: Stats Operation Register */
 #define MV88E6XXX_G1_STATS_OP			0x1d
@@ -256,6 +257,8 @@ int mv88e6390_g1_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip);
 
 int mv88e6185_g1_set_cascade_port(struct mv88e6xxx_chip *chip, int port);
 
+int mv88e6xxx_g1_set_device_number(struct mv88e6xxx_chip *chip, int index);
+
 int mv88e6xxx_g1_atu_set_learn2all(struct mv88e6xxx_chip *chip, bool learn2all);
 int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip,
 				  unsigned int msecs);