net: dsa: mv88e6xxx: Add mv88e6390 stats snapshot operation

The MV88E6390 has a control register for what the histogram statistics
actually contain. This means the stat_snapshot method should not set
this information. So implement the 6390 stats_snapshot function without
these bits.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -3283,6 +3283,7 @@ static const struct mv88e6xxx_ops mv88e6190_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_ops mv88e6190x_ops = {
@@ -3294,6 +3295,7 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390x_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_ops mv88e6191_ops = {
@@ -3305,6 +3307,7 @@ static const struct mv88e6xxx_ops mv88e6191_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_ops mv88e6240_ops = {
@@ -3330,6 +3333,7 @@ static const struct mv88e6xxx_ops mv88e6290_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_ops mv88e6320_ops = {
@@ -3405,6 +3409,7 @@ static const struct mv88e6xxx_ops mv88e6390_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_ops mv88e6390x_ops = {
@@ -3416,6 +3421,7 @@ static const struct mv88e6xxx_ops mv88e6390x_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390x_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_ops mv88e6391_ops = {
@@ -3427,6 +3433,7 @@ static const struct mv88e6xxx_ops mv88e6391_ops = {
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_rgmii_delay = mv88e6390_port_set_rgmii_delay,
 	.port_set_speed = mv88e6390_port_set_speed,
+	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 };
 
 static const struct mv88e6xxx_info mv88e6xxx_table[] = {

drivers/net/dsa/mv88e6xxx/global1.c

@@ -59,3 +59,19 @@ int mv88e6320_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
 
 	return mv88e6xxx_g1_stats_snapshot(chip, port);
 }
+
+int mv88e6390_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
+{
+	int err;
+
+	port = (port + 1) << 5;
+
+	/* Snapshot the hardware statistics counters for this port. */
+	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
+				 GLOBAL_STATS_OP_CAPTURE_PORT | port);
+	if (err)
+		return err;
+
+	/* Wait for the snapshotting to complete. */
+	return mv88e6xxx_g1_stats_wait(chip);
+}

drivers/net/dsa/mv88e6xxx/global1.h

@@ -21,5 +21,6 @@ int mv88e6xxx_g1_write(struct mv88e6xxx_chip *chip, int reg, u16 val);
 int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask);
 int mv88e6xxx_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port);
 int mv88e6320_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port);
+int mv88e6390_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port);
 
 #endif /* _MV88E6XXX_GLOBAL1_H */

drivers/net/dsa/mv88e6xxx/mv88e6xxx.h

@@ -283,7 +283,9 @@
 #define GLOBAL_CONTROL_2	0x1c
 #define GLOBAL_CONTROL_2_NO_CASCADE		0xe000
 #define GLOBAL_CONTROL_2_MULTIPLE_CASCADE	0xf000
-
+#define GLOBAL_CONTROL_2_HIST_RX	       (0x1 << 6)
+#define GLOBAL_CONTROL_2_HIST_TX	       (0x2 << 6)
+#define GLOBAL_CONTROL_2_HIST_RX_TX	       (0x3 << 6)
 #define GLOBAL_STATS_OP		0x1d
 #define GLOBAL_STATS_OP_BUSY	BIT(15)
 #define GLOBAL_STATS_OP_NOP		(0 << 12)