[PATCH net-next 14/21] net: dsa: mv88e6xxx: factorize GLOBAL_CONTROL setup

[Vivien Didelot]

All switch models configure the GLOBAL_CONTROL register with slightly
differences.

Discarding packets with excessive collisions
(GLOBAL_CONTROL_DISCARD_EXCESS) is specific to 6352 and similar
switches, and setting a maximum frame size
(GLOBAL_CONTROL_MAX_FRAME_1632) is specific to 6185 and similar
switches.

As we are centralizing the chips setup, skip these settings and don't
discard any frames yet, until we found out that such discarding by the
hardware is necessary.

Assume a common setup to enable the PHY Polling Unit if present, don't
discard any packets, and mask all interrupt sources.

Tested on 88E6352 and 88E6185.

Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/net/dsa/mv88e6123.c |  8 --------
 drivers/net/dsa/mv88e6131.c | 11 -----------
 drivers/net/dsa/mv88e6171.c |  9 ---------
 drivers/net/dsa/mv88e6352.c |  9 ---------
 drivers/net/dsa/mv88e6xxx.c | 13 +++++++++++++
 5 files changed, 13 insertions(+), 37 deletions(-)

diff --git a/drivers/net/dsa/mv88e6123.c b/drivers/net/dsa/mv88e6123.c
index d74695a..1cd30ac 100644
--- a/drivers/net/dsa/mv88e6123.c
+++ b/drivers/net/dsa/mv88e6123.c
@@ -58,14 +58,6 @@ static int mv88e6123_setup_global(struct dsa_switch *ds)
 	int ret;
 	u32 reg;
 
-	/* Disable the PHY polling unit (since there won't be any
-	 * external PHYs to poll), don't discard packets with
-	 * excessive collisions, and mask all interrupt sources.
-	 */
-	ret = mv88e6xxx_reg_write(ps, REG_GLOBAL, GLOBAL_CONTROL, 0x0000);
-	if (ret)
-		return ret;
-
 	/* Configure the upstream port, and configure the upstream
 	 * port as the port to which ingress and egress monitor frames
 	 * are to be sent.
diff --git a/drivers/net/dsa/mv88e6131.c b/drivers/net/dsa/mv88e6131.c
index e22ca7b..d05fc79 100644
--- a/drivers/net/dsa/mv88e6131.c
+++ b/drivers/net/dsa/mv88e6131.c
@@ -65,17 +65,6 @@ static int mv88e6131_setup_global(struct dsa_switch *ds)
 	int ret;
 	u32 reg;
 
-	/* Enable the PHY polling unit, don't discard packets with
-	 * excessive collisions, use a weighted fair queueing scheme
-	 * to arbitrate between packet queues, set the maximum frame
-	 * size to 1632, and mask all interrupt sources.
-	 */
-	ret = mv88e6xxx_reg_write(ps, REG_GLOBAL, GLOBAL_CONTROL,
-				  GLOBAL_CONTROL_PPU_ENABLE |
-				  GLOBAL_CONTROL_MAX_FRAME_1632);
-	if (ret)
-		return ret;
-
 	/* Set the VLAN ethertype to 0x8100. */
 	ret = mv88e6xxx_reg_write(ps, REG_GLOBAL, GLOBAL_CORE_TAG_TYPE, 0x8100);
 	if (ret)
diff --git a/drivers/net/dsa/mv88e6171.c b/drivers/net/dsa/mv88e6171.c
index 4bbf2e1..6c8554c 100644
--- a/drivers/net/dsa/mv88e6171.c
+++ b/drivers/net/dsa/mv88e6171.c
@@ -65,15 +65,6 @@ static int mv88e6171_setup_global(struct dsa_switch *ds)
 	int ret;
 	u32 reg;
 
-	/* Discard packets with excessive collisions, mask all
-	 * interrupt sources, enable PPU.
-	 */
-	ret = mv88e6xxx_reg_write(ps, REG_GLOBAL, GLOBAL_CONTROL,
-				  GLOBAL_CONTROL_PPU_ENABLE |
-				  GLOBAL_CONTROL_DISCARD_EXCESS);
-	if (ret)
-		return ret;
-
 	/* Configure the upstream port, and configure the upstream
 	 * port as the port to which ingress and egress monitor frames
 	 * are to be sent.
diff --git a/drivers/net/dsa/mv88e6352.c b/drivers/net/dsa/mv88e6352.c
index 3e0be87..a27616c 100644
--- a/drivers/net/dsa/mv88e6352.c
+++ b/drivers/net/dsa/mv88e6352.c
@@ -84,15 +84,6 @@ static int mv88e6352_setup_global(struct dsa_switch *ds)
 	int ret;
 	u32 reg;
 
-	/* Discard packets with excessive collisions,
-	 * mask all interrupt sources, enable PPU (bit 14, undocumented).
-	 */
-	ret = mv88e6xxx_reg_write(ps, REG_GLOBAL, GLOBAL_CONTROL,
-				  GLOBAL_CONTROL_PPU_ENABLE |
-				  GLOBAL_CONTROL_DISCARD_EXCESS);
-	if (ret)
-		return ret;
-
 	/* Configure the upstream port, and configure the upstream
 	 * port as the port to which ingress and egress monitor frames
 	 * are to be sent.
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 92f4b00..1572719 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -2914,9 +2914,22 @@ int mv88e6xxx_setup_ports(struct dsa_switch *ds)
 
 static int _mv88e6xxx_setup_global(struct mv88e6xxx_priv_state *ps)
 {
+	u16 reg;
 	int err;
 	int i;
 
+	/* Enable the PHY Polling Unit if present, don't discard any packets,
+	 * and mask all interrupt sources.
+	 */
+	reg = 0;
+	if (mv88e6xxx_has(ps, MV88E6XXX_FLAG_PPU) ||
+	    mv88e6xxx_has(ps, MV88E6XXX_FLAG_PPU_ACTIVE))
+		reg |= GLOBAL_CONTROL_PPU_ENABLE;
+
+	err = _mv88e6xxx_reg_write(ps, REG_GLOBAL, GLOBAL_CONTROL, reg);
+	if (err)
+		return err;
+
 	/* Set the default address aging time to 5 minutes, and
 	 * enable address learn messages to be sent to all message
 	 * ports.
-- 
2.8.2