net: dsa: mv88e6xxx: Decode ATU problem interrupt

When there is a problem with the ATU, an interrupt can be
generated. Trap this interrupt and decode the registers to determine
what the problem was, then log the error.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -3976,11 +3976,15 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 			if (err)
 				goto out_g1_irq;
 		}
+
+		err = mv88e6xxx_g1_atu_prob_irq_setup(chip);
+		if (err)
+			goto out_g2_irq;
 	}
 
 	err = mv88e6xxx_mdios_register(chip, np);
 	if (err)
-		goto out_g2_irq;
+		goto out_g1_atu_prob_irq;
 
 	err = mv88e6xxx_register_switch(chip);
 	if (err)
@@ -3990,6 +3994,8 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 
 out_mdio:
 	mv88e6xxx_mdios_unregister(chip);
+out_g1_atu_prob_irq:
+	mv88e6xxx_g1_atu_prob_irq_free(chip);
 out_g2_irq:
 	if (chip->info->g2_irqs > 0 && chip->irq > 0)
 		mv88e6xxx_g2_irq_free(chip);
@@ -4013,6 +4019,7 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
 	mv88e6xxx_mdios_unregister(chip);
 
 	if (chip->irq > 0) {
+		mv88e6xxx_g1_atu_prob_irq_free(chip);
 		if (chip->info->g2_irqs > 0)
 			mv88e6xxx_g2_irq_free(chip);
 		mutex_lock(&chip->reg_lock);

drivers/net/dsa/mv88e6xxx/chip.h

@@ -207,6 +207,7 @@ struct mv88e6xxx_chip {
 	int irq;
 	int device_irq;
 	int watchdog_irq;
+	int atu_prob_irq;
 };
 
 struct mv88e6xxx_bus_ops {

drivers/net/dsa/mv88e6xxx/global1.h

@@ -31,7 +31,7 @@
 #define MV88E6XXX_G1_STS_IRQ_STATS			6
 #define MV88E6XXX_G1_STS_IRQ_VTU_PROBLEM		5
 #define MV88E6XXX_G1_STS_IRQ_VTU_DONE			4
-#define MV88E6XXX_G1_STS_IRQ_ATU_PROBLEM		3
+#define MV88E6XXX_G1_STS_IRQ_ATU_PROB			3
 #define MV88E6XXX_G1_STS_IRQ_ATU_DONE			2
 #define MV88E6XXX_G1_STS_IRQ_TCAM_DONE			1
 #define MV88E6XXX_G1_STS_IRQ_EEPROM_DONE		0
@@ -122,6 +122,10 @@
 #define MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL_DB		0x5000
 #define MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC_DB	0x6000
 #define MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION		0x7000
+#define MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION		BIT(7)
+#define MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION		BIT(6)
+#define MV88E6XXX_G1_ATU_OP_MISS_VIOLTATION		BIT(5)
+#define MV88E6XXX_G1_ATU_OP_FULL_VIOLATION		BIT(4)
 
 /* Offset 0x0C: ATU Data Register */
 #define MV88E6XXX_G1_ATU_DATA				0x0c
@@ -255,6 +259,8 @@ int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
 int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all);
 int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
 			    bool all);
+int mv88e6xxx_g1_atu_prob_irq_setup(struct mv88e6xxx_chip *chip);
+void mv88e6xxx_g1_atu_prob_irq_free(struct mv88e6xxx_chip *chip);
 
 int mv88e6185_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
 			     struct mv88e6xxx_vtu_entry *entry);

drivers/net/dsa/mv88e6xxx/global1_atu.c

@@ -9,6 +9,8 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
 
 #include "chip.h"
 #include "global1.h"
@@ -307,3 +309,88 @@ int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
 
 	return mv88e6xxx_g1_atu_move(chip, fid, from_port, to_port, all);
 }
+
+static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
+{
+	struct mv88e6xxx_chip *chip = dev_id;
+	struct mv88e6xxx_atu_entry entry;
+	int err;
+	u16 val;
+
+	mutex_lock(&chip->reg_lock);
+
+	err = mv88e6xxx_g1_atu_op(chip, 0,
+				  MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION);
+	if (err)
+		goto out;
+
+	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_OP, &val);
+	if (err)
+		goto out;
+
+	err = mv88e6xxx_g1_atu_data_read(chip, &entry);
+	if (err)
+		goto out;
+
+	err = mv88e6xxx_g1_atu_mac_read(chip, &entry);
+	if (err)
+		goto out;
+
+	mutex_unlock(&chip->reg_lock);
+
+	if (val & MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION) {
+		dev_err_ratelimited(chip->dev,
+				    "ATU age out violation for %pM\n",
+				    entry.mac);
+	}
+
+	if (val & MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION) {
+		dev_err_ratelimited(chip->dev,
+				    "ATU member violation for %pM portvec %x\n",
+				    entry.mac, entry.portvec);
+	}
+
+	if (val & MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION)
+		dev_err_ratelimited(chip->dev,
+				    "ATU miss violation for %pM portvec %x\n",
+				    entry.mac, entry.portvec);
+
+	if (val & MV88E6XXX_G1_ATU_OP_FULL_VIOLATION)
+		dev_err_ratelimited(chip->dev,
+				    "ATU full violation for %pM portvec %x\n",
+				    entry.mac, entry.portvec);
+
+	return IRQ_HANDLED;
+
+out:
+	mutex_unlock(&chip->reg_lock);
+
+	dev_err(chip->dev, "ATU problem: error %d while handling interrupt\n",
+		err);
+	return IRQ_HANDLED;
+}
+
+int mv88e6xxx_g1_atu_prob_irq_setup(struct mv88e6xxx_chip *chip)
+{
+	int err;
+
+	chip->atu_prob_irq = irq_find_mapping(chip->g1_irq.domain,
+					      MV88E6XXX_G1_STS_IRQ_ATU_PROB);
+	if (chip->atu_prob_irq < 0)
+		return chip->device_irq;
+
+	err = request_threaded_irq(chip->atu_prob_irq, NULL,
+				   mv88e6xxx_g1_atu_prob_irq_thread_fn,
+				   IRQF_ONESHOT, "mv88e6xxx-g1-atu-prob",
+				   chip);
+	if (err)
+		irq_dispose_mapping(chip->atu_prob_irq);
+
+	return err;
+}
+
+void mv88e6xxx_g1_atu_prob_irq_free(struct mv88e6xxx_chip *chip)
+{
+	free_irq(chip->atu_prob_irq, chip);
+	irq_dispose_mapping(chip->atu_prob_irq);
+}