net: dsa: mv88e6xxx: implement watchdog_ops for mv88e6250

The MV88E6352_G2_WDOG_CTL_* bits almost, but not quite, describe the
watchdog control register on the mv88e6250. Among those actually
referenced in the code, only QC_ENABLE differs (bit 6 rather than bit
5).
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/global2.c

@@ -816,6 +816,32 @@ const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops = {
 	.irq_free = mv88e6097_watchdog_free,
 };
 
+static void mv88e6250_watchdog_free(struct mv88e6xxx_chip *chip)
+{
+	u16 reg;
+
+	mv88e6xxx_g2_read(chip, MV88E6250_G2_WDOG_CTL, &reg);
+
+	reg &= ~(MV88E6250_G2_WDOG_CTL_EGRESS_ENABLE |
+		 MV88E6250_G2_WDOG_CTL_QC_ENABLE);
+
+	mv88e6xxx_g2_write(chip, MV88E6250_G2_WDOG_CTL, reg);
+}
+
+static int mv88e6250_watchdog_setup(struct mv88e6xxx_chip *chip)
+{
+	return mv88e6xxx_g2_write(chip, MV88E6250_G2_WDOG_CTL,
+				  MV88E6250_G2_WDOG_CTL_EGRESS_ENABLE |
+				  MV88E6250_G2_WDOG_CTL_QC_ENABLE |
+				  MV88E6250_G2_WDOG_CTL_SWRESET);
+}
+
+const struct mv88e6xxx_irq_ops mv88e6250_watchdog_ops = {
+	.irq_action = mv88e6097_watchdog_action,
+	.irq_setup = mv88e6250_watchdog_setup,
+	.irq_free = mv88e6250_watchdog_free,
+};
+
 static int mv88e6390_watchdog_setup(struct mv88e6xxx_chip *chip)
 {
 	return mv88e6xxx_g2_update(chip, MV88E6390_G2_WDOG_CTL,

drivers/net/dsa/mv88e6xxx/global2.h

@@ -205,6 +205,18 @@
 #define MV88E6XXX_G2_SCRATCH_MISC_PTR_MASK	0x7f00
 #define MV88E6XXX_G2_SCRATCH_MISC_DATA_MASK	0x00ff
 
+/* Offset 0x1B: Watch Dog Control Register */
+#define MV88E6250_G2_WDOG_CTL			0x1b
+#define MV88E6250_G2_WDOG_CTL_QC_HISTORY	0x0100
+#define MV88E6250_G2_WDOG_CTL_QC_EVENT		0x0080
+#define MV88E6250_G2_WDOG_CTL_QC_ENABLE		0x0040
+#define MV88E6250_G2_WDOG_CTL_EGRESS_HISTORY	0x0020
+#define MV88E6250_G2_WDOG_CTL_EGRESS_EVENT	0x0010
+#define MV88E6250_G2_WDOG_CTL_EGRESS_ENABLE	0x0008
+#define MV88E6250_G2_WDOG_CTL_FORCE_IRQ		0x0004
+#define MV88E6250_G2_WDOG_CTL_HISTORY		0x0002
+#define MV88E6250_G2_WDOG_CTL_SWRESET		0x0001
+
 /* Offset 0x1B: Watch Dog Control Register */
 #define MV88E6352_G2_WDOG_CTL			0x1b
 #define MV88E6352_G2_WDOG_CTL_EGRESS_EVENT	0x0080
@@ -334,6 +346,7 @@ int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target,
 				      int port);
 
 extern const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops;
+extern const struct mv88e6xxx_irq_ops mv88e6250_watchdog_ops;
 extern const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops;
 
 extern const struct mv88e6xxx_avb_ops mv88e6165_avb_ops;
@@ -484,6 +497,7 @@ static inline int mv88e6xxx_g2_pot_clear(struct mv88e6xxx_chip *chip)
 }
 
 static const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops = {};
+static const struct mv88e6xxx_irq_ops mv88e6250_watchdog_ops = {};
 static const struct mv88e6xxx_irq_ops mv88e6390_watchdog_ops = {};
 
 static const struct mv88e6xxx_avb_ops mv88e6165_avb_ops = {};