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Subject[PATCH net-next v2 2/9] net: dsa: mv88e6xxx: use 4-bit port for PVT data
Date
The Cross-chip Port Based VLAN Table (PVT) supports two indexing modes,
one using 5-bit for device and 4-bit for port, the other using 4-bit for
device and 5-bit for port, configured via the Global 2 Misc register.

Only 4 bits for the source port are needed when interconnecting 88E6xxx
switch devices since they all support less than 16 physical ports. The
full 5 bits are needed when interconnecting a device with 98DXxxx switch
devices since they support more than 16 physical ports.

Add a mv88e6xxx_pvt_setup helper to set the 4-bit port PVT mode, which
will be extended later to also initialize the PVT content.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
---
drivers/net/dsa/mv88e6xxx/chip.c | 15 +++++++++++++++
drivers/net/dsa/mv88e6xxx/global2.c | 25 +++++++++++++++++++++++++
drivers/net/dsa/mv88e6xxx/global2.h | 7 +++++++
drivers/net/dsa/mv88e6xxx/mv88e6xxx.h | 1 +
4 files changed, 48 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 8f1f881d0375..2a32bb490f92 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1198,6 +1198,17 @@ static int mv88e6xxx_atu_setup(struct mv88e6xxx_chip *chip)
return mv88e6xxx_g1_atu_set_age_time(chip, 300000);
}

+static int mv88e6xxx_pvt_setup(struct mv88e6xxx_chip *chip)
+{
+ if (!mv88e6xxx_has_pvt(chip))
+ return 0;
+
+ /* Clear 5 Bit Port for usage with Marvell Link Street devices:
+ * use 4 bits for the Src_Port/Src_Trunk and 5 bits for the Src_Dev.
+ */
+ return mv88e6xxx_g2_misc_4_bit_port(chip);
+}
+
static void mv88e6xxx_port_fast_age(struct dsa_switch *ds, int port)
{
struct mv88e6xxx_chip *chip = ds->priv;
@@ -2594,6 +2605,10 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
goto unlock;
}

+ err = mv88e6xxx_pvt_setup(chip);
+ if (err)
+ goto unlock;
+
err = mv88e6xxx_atu_setup(chip);
if (err)
goto unlock;
diff --git a/drivers/net/dsa/mv88e6xxx/global2.c b/drivers/net/dsa/mv88e6xxx/global2.c
index 6228aab2ad35..d64f4c15ccb7 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.c
+++ b/drivers/net/dsa/mv88e6xxx/global2.c
@@ -784,6 +784,31 @@ static int mv88e6xxx_g2_watchdog_setup(struct mv88e6xxx_chip *chip)
return err;
}

+/* Offset 0x1D: Misc Register */
+
+static int mv88e6xxx_g2_misc_5_bit_port(struct mv88e6xxx_chip *chip,
+ bool port_5_bit)
+{
+ u16 val;
+ int err;
+
+ err = mv88e6xxx_g2_read(chip, GLOBAL2_MISC, &val);
+ if (err)
+ return err;
+
+ if (port_5_bit)
+ val |= GLOBAL2_MISC_5_BIT_PORT;
+ else
+ val &= ~GLOBAL2_MISC_5_BIT_PORT;
+
+ return mv88e6xxx_g2_write(chip, GLOBAL2_MISC, val);
+}
+
+int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip)
+{
+ return mv88e6xxx_g2_misc_5_bit_port(chip, false);
+}
+
static void mv88e6xxx_g2_irq_mask(struct irq_data *d)
{
struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
diff --git a/drivers/net/dsa/mv88e6xxx/global2.h b/drivers/net/dsa/mv88e6xxx/global2.h
index f8b6dd93213a..71fb2ff541ba 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.h
+++ b/drivers/net/dsa/mv88e6xxx/global2.h
@@ -42,6 +42,8 @@ int mv88e6xxx_g2_get_eeprom16(struct mv88e6xxx_chip *chip,
int mv88e6xxx_g2_set_eeprom16(struct mv88e6xxx_chip *chip,
struct ethtool_eeprom *eeprom, u8 *data);

+int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip);
+
int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip);
int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip);
void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip);
@@ -110,6 +112,11 @@ static inline int mv88e6xxx_g2_set_eeprom16(struct mv88e6xxx_chip *chip,
return -EOPNOTSUPP;
}

+int mv88e6xxx_g2_misc_4_bit_port(struct mv88e6xxx_chip *chip)
+{
+ return -EOPNOTSUPP;
+}
+
static inline int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
{
return -EOPNOTSUPP;
diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
index 97dd3e2d2a56..bcaa55b20f5a 100644
--- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
@@ -439,6 +439,7 @@
#define GLOBAL2_WDOG_FORCE_IRQ BIT(0)
#define GLOBAL2_QOS_WEIGHT 0x1c
#define GLOBAL2_MISC 0x1d
+#define GLOBAL2_MISC_5_BIT_PORT BIT(14)

#define MV88E6XXX_N_FID 4096

--
2.12.1
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