net: dsa: mv88e6xxx: rework ATU Flush

Add a fresh documented implementation of the ATU Flush/Move operation.
Use it to replace the current ATU Flush operation.

_mv88e6xxx_atu_flush_move is still used by the Move operation so keep it
until the Move operation is refactored in a next commit.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -1210,17 +1210,6 @@ static int _mv88e6xxx_atu_flush_move(struct mv88e6xxx_chip *chip,
 	return _mv88e6xxx_atu_cmd(chip, entry->fid, op);
 }
 
-static int _mv88e6xxx_atu_flush(struct mv88e6xxx_chip *chip,
-				u16 fid, bool static_too)
-{
-	struct mv88e6xxx_atu_entry entry = {
-		.fid = fid,
-		.state = 0, /* EntryState bits must be 0 */
-	};
-
-	return _mv88e6xxx_atu_flush_move(chip, &entry, static_too);
-}
-
 static int _mv88e6xxx_atu_move(struct mv88e6xxx_chip *chip, u16 fid,
 			       int from_port, int to_port, bool static_too)
 {
@@ -1310,6 +1299,10 @@ static int mv88e6xxx_atu_setup(struct mv88e6xxx_chip *chip)
 {
 	int err;
 
+	err = mv88e6xxx_g1_atu_flush(chip, 0, true);
+	if (err)
+		return err;
+
 	err = mv88e6xxx_g1_atu_set_learn2all(chip, true);
 	if (err)
 		return err;
@@ -1714,7 +1707,7 @@ static int _mv88e6xxx_fid_new(struct mv88e6xxx_chip *chip, u16 *fid)
 		return -ENOSPC;
 
 	/* Clear the database */
-	return _mv88e6xxx_atu_flush(chip, *fid, true);
+	return mv88e6xxx_g1_atu_flush(chip, *fid, true);
 }
 
 static int _mv88e6xxx_vtu_new(struct mv88e6xxx_chip *chip, u16 vid,
@@ -2634,11 +2627,6 @@ static int mv88e6xxx_g1_setup(struct mv88e6xxx_chip *chip)
 	if (err < 0)
 		return err;
 
-	/* Clear all ATU entries */
-	err = _mv88e6xxx_atu_flush(chip, 0, true);
-	if (err)
-		return err;
-
 	/* Configure the IP ToS mapping registers. */
 	err = mv88e6xxx_g1_write(chip, GLOBAL_IP_PRI_0, 0x0000);
 	if (err)

drivers/net/dsa/mv88e6xxx/global1.h

@@ -45,5 +45,6 @@ int mv88e6xxx_g1_atu_getnext(struct mv88e6xxx_chip *chip, u16 fid,
 			     struct mv88e6xxx_atu_entry *entry);
 int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
 			       struct mv88e6xxx_atu_entry *entry);
+int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all);
 
 #endif /* _MV88E6XXX_GLOBAL1_H */

drivers/net/dsa/mv88e6xxx/global1_atu.c

@@ -232,3 +232,40 @@ int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
 
 	return mv88e6xxx_g1_atu_op(chip, fid, GLOBAL_ATU_OP_LOAD_DB);
 }
+
+static int mv88e6xxx_g1_atu_flushmove(struct mv88e6xxx_chip *chip, u16 fid,
+				      struct mv88e6xxx_atu_entry *entry,
+				      bool all)
+{
+	u16 op;
+	int err;
+
+	err = mv88e6xxx_g1_atu_op_wait(chip);
+	if (err)
+		return err;
+
+	err = mv88e6xxx_g1_atu_data_write(chip, entry);
+	if (err)
+		return err;
+
+	/* Flush/Move all or non-static entries from all or a given database */
+	if (all && fid)
+		op = GLOBAL_ATU_OP_FLUSH_MOVE_ALL_DB;
+	else if (fid)
+		op = GLOBAL_ATU_OP_FLUSH_MOVE_NON_STATIC_DB;
+	else if (all)
+		op = GLOBAL_ATU_OP_FLUSH_MOVE_ALL;
+	else
+		op = GLOBAL_ATU_OP_FLUSH_MOVE_NON_STATIC;
+
+	return mv88e6xxx_g1_atu_op(chip, fid, op);
+}
+
+int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all)
+{
+	struct mv88e6xxx_atu_entry entry = {
+		.state = 0, /* Null EntryState means Flush */
+	};
+
+	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
+}