net: dsa: mv88e6xxx: Implement mv88e6390 pause control

The mv88e6390 has a number flow control registers accessed via the
Flow Control register. Use these to set the pause control.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -3490,6 +3490,7 @@ static const struct mv88e6xxx_ops mv88e6190_ops = {
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
 	.port_set_egress_unknowns = mv88e6351_port_set_egress_unknowns,
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,
@@ -3513,6 +3514,7 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
 	.port_set_egress_unknowns = mv88e6351_port_set_egress_unknowns,
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,
@@ -3536,6 +3538,7 @@ static const struct mv88e6xxx_ops mv88e6191_ops = {
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
 	.port_set_egress_unknowns = mv88e6351_port_set_egress_unknowns,
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,
@@ -3586,6 +3589,7 @@ static const struct mv88e6xxx_ops mv88e6290_ops = {
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
 	.port_set_egress_unknowns = mv88e6351_port_set_egress_unknowns,
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,
@@ -3739,6 +3743,7 @@ static const struct mv88e6xxx_ops mv88e6390_ops = {
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
 	.port_jumbo_config = mv88e6165_port_jumbo_config,
 	.port_egress_rate_limiting = mv88e6097_port_egress_rate_limiting,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,
@@ -3764,6 +3769,7 @@ static const struct mv88e6xxx_ops mv88e6390x_ops = {
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
 	.port_jumbo_config = mv88e6165_port_jumbo_config,
 	.port_egress_rate_limiting = mv88e6097_port_egress_rate_limiting,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,
@@ -3787,6 +3793,7 @@ static const struct mv88e6xxx_ops mv88e6391_ops = {
 	.port_set_frame_mode = mv88e6351_port_set_frame_mode,
 	.port_set_egress_unknowns = mv88e6351_port_set_egress_unknowns,
 	.port_set_ether_type = mv88e6351_port_set_ether_type,
+	.port_pause_config = mv88e6390_port_pause_config,
 	.stats_snapshot = mv88e6390_g1_stats_snapshot,
 	.stats_set_histogram = mv88e6390_g1_stats_set_histogram,
 	.stats_get_sset_count = mv88e6320_stats_get_sset_count,

drivers/net/dsa/mv88e6xxx/mv88e6xxx.h

@@ -78,6 +78,8 @@
 #define PORT_PCS_CTRL_SPEED_10000	(0x03) /* 6390X */
 #define PORT_PCS_CTRL_SPEED_UNFORCED	(0x03)
 #define PORT_PAUSE_CTRL		0x02
+#define PORT_FLOW_CTRL_LIMIT_IN		((0x00 << 8) | BIT(15))
+#define PORT_FLOW_CTRL_LIMIT_OUT	((0x01 << 8) | BIT(15))
 #define PORT_SWITCH_ID		0x03
 #define PORT_SWITCH_ID_PROD_NUM_6085	0x04a
 #define PORT_SWITCH_ID_PROD_NUM_6095	0x095

drivers/net/dsa/mv88e6xxx/port.c

@@ -315,6 +315,19 @@ int mv88e6097_port_pause_config(struct mv88e6xxx_chip *chip, int port)
 	return mv88e6xxx_port_write(chip, port, PORT_PAUSE_CTRL, 0x0000);
 }
 
+int mv88e6390_port_pause_config(struct mv88e6xxx_chip *chip, int port)
+{
+	int err;
+
+	err = mv88e6xxx_port_write(chip, port, PORT_PAUSE_CTRL,
+				   PORT_FLOW_CTRL_LIMIT_IN | 0);
+	if (err)
+		return err;
+
+	return mv88e6xxx_port_write(chip, port, PORT_PAUSE_CTRL,
+				    PORT_FLOW_CTRL_LIMIT_OUT | 0);
+}
+
 /* Offset 0x04: Port Control Register */
 
 static const char * const mv88e6xxx_port_state_names[] = {

drivers/net/dsa/mv88e6xxx/port.h

@@ -66,5 +66,6 @@ int mv88e6165_port_jumbo_config(struct mv88e6xxx_chip *chip, int port);
 int mv88e6095_port_egress_rate_limiting(struct mv88e6xxx_chip *chip, int port);
 int mv88e6097_port_egress_rate_limiting(struct mv88e6xxx_chip *chip, int port);
 int mv88e6097_port_pause_config(struct mv88e6xxx_chip *chip, int port);
+int mv88e6390_port_pause_config(struct mv88e6xxx_chip *chip, int port);
 
 #endif /* _MV88E6XXX_PORT_H */