Merge branch 'mv88e6xxx-interrupt-support'

Andrew Lunn says:

====================
Interrupt support for mv88e6xxx

This patchset add interrupt controller support to the MV88E6xxx.  This
allows access to the interrupts the internal PHY generate. These
interrupts can then be associated to a PHY device in the device tree
and used by the PHY lib, rather than polling.

Since interrupt handling needs to make MDIO bus accesses, threaded
interrupts are used. The phylib needs to request the PHY interrupt
using the threaded IRQ API. This in term allows some simplification to
the code, in that the phylib interrupt handler can directly call
phy_change(), rather than use a work queue. The work queue is however
retained for the phy_mac_interrupt() call, which can be called in hard
interrupt context.

Since RFC v1:

Keep phy_mac_interrupt() callable in hard IRQ context.

The fix to trigger the phy state machine transitions on interrupts has
already been submitted, so is dropped from here.

Added back shared interrupts support.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/dsa/marvell.txt

@@ -20,16 +20,35 @@ Required properties:
 Optional properties:
 
 - reset-gpios		: Should be a gpio specifier for a reset line
-
+- interrupt-parent	: Parent interrupt controller
+- interrupts		: Interrupt from the switch
+- interrupt-controller	: Indicates the switch is itself an interrupt
+			  controller. This is used for the PHY interrupts.
+#interrupt-cells = <2>	: Controller uses two cells, number and flag
+- mdio			: container of PHY and devices on the switches MDIO
+			  bus
 Example:
 
        mdio {
                #address-cells = <1>;
                #size-cells = <0>;
+               interrupt-parent = <&gpio0>;
+               interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
 
                switch0: switch@0 {
                        compatible = "marvell,mv88e6085";
                        reg = <0>;
 		       reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;
                };
+               mdio {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       switch1phy0: switch1phy0@0 {
+                               reg = <0>;
+                               interrupt-parent = <&switch0>;
+                               interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+                       };
+               };
        };

arch/arm/boot/dts/vf610-zii-dev-rev-b.dts

@@ -88,10 +88,16 @@
 
 			switch0: switch0@0 {
 				compatible = "marvell,mv88e6085";
+				pinctrl-0 = <&pinctrl_gpio_switch0>;
+				pinctrl-names = "default";
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0>;
 				dsa,member = <0 0>;
+				interrupt-parent = <&gpio0>;
+				interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
+				interrupt-controller;
+				#interrupt-cells = <2>;
 
 				ports {
 					#address-cells = <1>;
@@ -99,16 +105,19 @@
 					port@0 {
 						reg = <0>;
 						label = "lan0";
+						phy-handle = <&switch0phy0>;
 					};
 
 					port@1 {
 						reg = <1>;
 						label = "lan1";
+						phy-handle = <&switch0phy1>;
 					};
 
 					port@2 {
 						reg = <2>;
 						label = "lan2";
+						phy-handle = <&switch0phy2>;
 					};
 
 					switch0port5: port@5 {
@@ -133,6 +142,24 @@
 						};
 					};
 				};
+				mdio {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					switch0phy0: switch0phy0@0 {
+						reg = <0>;
+						interrupt-parent = <&switch0>;
+						interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+					};
+					switch0phy1: switch1phy0@1 {
+						reg = <1>;
+						interrupt-parent = <&switch0>;
+						interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;					};
+					switch0phy2: switch1phy0@2 {
+						reg = <2>;
+						interrupt-parent = <&switch0>;
+						interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+					};
+				};
 			};
 		};
 
@@ -143,10 +170,16 @@
 
 			switch1: switch1@0 {
 				compatible = "marvell,mv88e6085";
+				pinctrl-0 = <&pinctrl_gpio_switch1>;
+				pinctrl-names = "default";
 				#address-cells = <1>;
 				#size-cells = <0>;
 				reg = <0>;
 				dsa,member = <0 1>;
+				interrupt-parent = <&gpio0>;
+				interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
+				interrupt-controller;
+				#interrupt-cells = <2>;
 
 				ports {
 					#address-cells = <1>;
@@ -196,12 +229,18 @@
 					#size-cells = <0>;
 					switch1phy0: switch1phy0@0 {
 						reg = <0>;
+						interrupt-parent = <&switch1>;
+						interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
 					};
 					switch1phy1: switch1phy0@1 {
 						reg = <1>;
+						interrupt-parent = <&switch1>;
+						interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
 					};
 					switch1phy2: switch1phy0@2 {
 						reg = <2>;
+						interrupt-parent = <&switch1>;
+						interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
 					};
 				};
 			};
@@ -636,6 +675,18 @@
 		>;
 	};
 
+	pinctrl_gpio_switch0: pinctrl-gpio-switch0 {
+		fsl,pins = <
+			VF610_PAD_PTB5__GPIO_27		0x219d
+		>;
+	};
+
+	pinctrl_gpio_switch1: pinctrl-gpio-switch1 {
+		fsl,pins = <
+			VF610_PAD_PTB4__GPIO_26		0x219d
+		>;
+	};
+
 	pinctrl_i2c_mux_reset: pinctrl-i2c-mux-reset {
 		fsl,pins = <
 			 VF610_PAD_PTE14__GPIO_119	0x31c2

drivers/net/dsa/mv88e6xxx/chip.c

@@ -18,11 +18,15 @@
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/if_bridge.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/jiffies.h>
 #include <linux/list.h>
 #include <linux/mdio.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
 #include <linux/of_mdio.h>
 #include <linux/netdevice.h>
 #include <linux/gpio/consumer.h>
@@ -323,6 +327,164 @@ static int mv88e6xxx_serdes_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
 					reg, val);
 }
 
+static void mv88e6xxx_g1_irq_mask(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int n = d->hwirq;
+
+	chip->g1_irq.masked |= (1 << n);
+}
+
+static void mv88e6xxx_g1_irq_unmask(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int n = d->hwirq;
+
+	chip->g1_irq.masked &= ~(1 << n);
+}
+
+static irqreturn_t mv88e6xxx_g1_irq_thread_fn(int irq, void *dev_id)
+{
+	struct mv88e6xxx_chip *chip = dev_id;
+	unsigned int nhandled = 0;
+	unsigned int sub_irq;
+	unsigned int n;
+	u16 reg;
+	int err;
+
+	mutex_lock(&chip->reg_lock);
+	err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &reg);
+	mutex_unlock(&chip->reg_lock);
+
+	if (err)
+		goto out;
+
+	for (n = 0; n < chip->g1_irq.nirqs; ++n) {
+		if (reg & (1 << n)) {
+			sub_irq = irq_find_mapping(chip->g1_irq.domain, n);
+			handle_nested_irq(sub_irq);
+			++nhandled;
+		}
+	}
+out:
+	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
+}
+
+static void mv88e6xxx_g1_irq_bus_lock(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+
+	mutex_lock(&chip->reg_lock);
+}
+
+static void mv88e6xxx_g1_irq_bus_sync_unlock(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+	u16 mask = GENMASK(chip->g1_irq.nirqs, 0);
+	u16 reg;
+	int err;
+
+	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &reg);
+	if (err)
+		goto out;
+
+	reg &= ~mask;
+	reg |= (~chip->g1_irq.masked & mask);
+
+	err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, reg);
+	if (err)
+		goto out;
+
+out:
+	mutex_unlock(&chip->reg_lock);
+}
+
+static struct irq_chip mv88e6xxx_g1_irq_chip = {
+	.name			= "mv88e6xxx-g1",
+	.irq_mask		= mv88e6xxx_g1_irq_mask,
+	.irq_unmask		= mv88e6xxx_g1_irq_unmask,
+	.irq_bus_lock		= mv88e6xxx_g1_irq_bus_lock,
+	.irq_bus_sync_unlock	= mv88e6xxx_g1_irq_bus_sync_unlock,
+};
+
+static int mv88e6xxx_g1_irq_domain_map(struct irq_domain *d,
+				       unsigned int irq,
+				       irq_hw_number_t hwirq)
+{
+	struct mv88e6xxx_chip *chip = d->host_data;
+
+	irq_set_chip_data(irq, d->host_data);
+	irq_set_chip_and_handler(irq, &chip->g1_irq.chip, handle_level_irq);
+	irq_set_noprobe(irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops mv88e6xxx_g1_irq_domain_ops = {
+	.map	= mv88e6xxx_g1_irq_domain_map,
+	.xlate	= irq_domain_xlate_twocell,
+};
+
+static void mv88e6xxx_g1_irq_free(struct mv88e6xxx_chip *chip)
+{
+	int irq, virq;
+
+	for (irq = 0; irq < 16; irq++) {
+		virq = irq_find_mapping(chip->g2_irq.domain, irq);
+		irq_dispose_mapping(virq);
+	}
+
+	irq_domain_remove(chip->g2_irq.domain);
+}
+
+static int mv88e6xxx_g1_irq_setup(struct mv88e6xxx_chip *chip)
+{
+	int err, irq;
+	u16 reg;
+
+	chip->g1_irq.nirqs = chip->info->g1_irqs;
+	chip->g1_irq.domain = irq_domain_add_simple(
+		NULL, chip->g1_irq.nirqs, 0,
+		&mv88e6xxx_g1_irq_domain_ops, chip);
+	if (!chip->g1_irq.domain)
+		return -ENOMEM;
+
+	for (irq = 0; irq < chip->g1_irq.nirqs; irq++)
+		irq_create_mapping(chip->g1_irq.domain, irq);
+
+	chip->g1_irq.chip = mv88e6xxx_g1_irq_chip;
+	chip->g1_irq.masked = ~0;
+
+	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &reg);
+	if (err)
+		goto out;
+
+	reg &= ~GENMASK(chip->g1_irq.nirqs, 0);
+
+	err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, reg);
+	if (err)
+		goto out;
+
+	/* Reading the interrupt status clears (most of) them */
+	err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &reg);
+	if (err)
+		goto out;
+
+	err = request_threaded_irq(chip->irq, NULL,
+				   mv88e6xxx_g1_irq_thread_fn,
+				   IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
+				   dev_name(chip->dev), chip);
+	if (err)
+		goto out;
+
+	return 0;
+
+out:
+	mv88e6xxx_g1_irq_free(chip);
+
+	return err;
+}
+
 int mv88e6xxx_wait(struct mv88e6xxx_chip *chip, int addr, int reg, u16 mask)
 {
 	int i;
@@ -2770,7 +2932,11 @@ static int mv88e6xxx_g1_setup(struct mv88e6xxx_chip *chip)
 	/* Enable the PHY Polling Unit if present, don't discard any packets,
 	 * and mask all interrupt sources.
 	 */
-	reg = 0;
+	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &reg);
+	if (err < 0)
+		return err;
+
+	reg &= ~GLOBAL_CONTROL_PPU_ENABLE;
 	if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_PPU) ||
 	    mv88e6xxx_has(chip, MV88E6XXX_FLAG_PPU_ACTIVE))
 		reg |= GLOBAL_CONTROL_PPU_ENABLE;
@@ -2875,10 +3041,6 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 
 	mutex_lock(&chip->reg_lock);
 
-	err = mv88e6xxx_switch_reset(chip);
-	if (err)
-		goto unlock;
-
 	/* Setup Switch Port Registers */
 	for (i = 0; i < mv88e6xxx_num_ports(chip); i++) {
 		err = mv88e6xxx_setup_port(chip, i);
@@ -3326,6 +3488,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 8,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6097,
 		.ops = &mv88e6085_ops,
 	},
@@ -3339,6 +3502,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 8,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6095,
 		.ops = &mv88e6095_ops,
 	},
@@ -3352,6 +3516,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6165,
 		.ops = &mv88e6123_ops,
 	},
@@ -3365,6 +3530,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6185,
 		.ops = &mv88e6131_ops,
 	},
@@ -3378,6 +3544,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6165,
 		.ops = &mv88e6161_ops,
 	},
@@ -3391,6 +3558,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6165,
 		.ops = &mv88e6165_ops,
 	},
@@ -3404,6 +3572,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6351,
 		.ops = &mv88e6171_ops,
 	},
@@ -3417,6 +3586,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6352,
 		.ops = &mv88e6172_ops,
 	},
@@ -3430,6 +3600,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6351,
 		.ops = &mv88e6175_ops,
 	},
@@ -3443,6 +3614,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6352,
 		.ops = &mv88e6176_ops,
 	},
@@ -3456,6 +3628,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 8,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6185,
 		.ops = &mv88e6185_ops,
 	},
@@ -3469,6 +3642,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6352,
 		.ops = &mv88e6240_ops,
 	},
@@ -3482,6 +3656,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 8,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6320,
 		.ops = &mv88e6320_ops,
 	},
@@ -3495,6 +3670,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 8,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6320,
 		.ops = &mv88e6321_ops,
 	},
@@ -3508,6 +3684,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6351,
 		.ops = &mv88e6350_ops,
 	},
@@ -3521,6 +3698,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6351,
 		.ops = &mv88e6351_ops,
 	},
@@ -3534,6 +3712,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.port_base_addr = 0x10,
 		.global1_addr = 0x1b,
 		.age_time_coeff = 15000,
+		.g1_irqs = 9,
 		.flags = MV88E6XXX_FLAGS_FAMILY_6352,
 		.ops = &mv88e6352_ops,
 	},
@@ -3667,6 +3846,12 @@ static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
 	if (err)
 		goto free;
 
+	mutex_lock(&chip->reg_lock);
+	err = mv88e6xxx_switch_reset(chip);
+	mutex_unlock(&chip->reg_lock);
+	if (err)
+		goto free;
+
 	mv88e6xxx_phy_init(chip);
 
 	err = mv88e6xxx_mdio_register(chip, NULL);
@@ -3837,17 +4022,56 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 	    !of_property_read_u32(np, "eeprom-length", &eeprom_len))
 		chip->eeprom_len = eeprom_len;
 
+	mutex_lock(&chip->reg_lock);
+	err = mv88e6xxx_switch_reset(chip);
+	mutex_unlock(&chip->reg_lock);
+	if (err)
+		goto out;
+
+	chip->irq = of_irq_get(np, 0);
+	if (chip->irq == -EPROBE_DEFER) {
+		err = chip->irq;
+		goto out;
+	}
+
+	if (chip->irq > 0) {
+		/* Has to be performed before the MDIO bus is created,
+		 * because the PHYs will link there interrupts to these
+		 * interrupt controllers
+		 */
+		mutex_lock(&chip->reg_lock);
+		err = mv88e6xxx_g1_irq_setup(chip);
+		mutex_unlock(&chip->reg_lock);
+
+		if (err)
+			goto out;
+
+		if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_G2_INT)) {
+			err = mv88e6xxx_g2_irq_setup(chip);
+			if (err)
+				goto out_g1_irq;
+		}
+	}
+
 	err = mv88e6xxx_mdio_register(chip, np);
 	if (err)
-		return err;
+		goto out_g2_irq;
 
 	err = mv88e6xxx_register_switch(chip, np);
-	if (err) {
-		mv88e6xxx_mdio_unregister(chip);
-		return err;
-	}
+	if (err)
+		goto out_mdio;
 
 	return 0;
+
+out_mdio:
+	mv88e6xxx_mdio_unregister(chip);
+out_g2_irq:
+	if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_G2_INT))
+		mv88e6xxx_g2_irq_free(chip);
+out_g1_irq:
+	mv88e6xxx_g1_irq_free(chip);
+out:
+	return err;
 }
 
 static void mv88e6xxx_remove(struct mdio_device *mdiodev)
@@ -3858,6 +4082,10 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
 	mv88e6xxx_phy_destroy(chip);
 	mv88e6xxx_unregister_switch(chip);
 	mv88e6xxx_mdio_unregister(chip);
+
+	if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_G2_INT))
+		mv88e6xxx_g2_irq_free(chip);
+	mv88e6xxx_g1_irq_free(chip);
 }
 
 static const struct of_device_id mv88e6xxx_of_match[] = {

drivers/net/dsa/mv88e6xxx/global2.c

 /*
- * Marvell 88E6xxx Switch Global 2 Registers support (device address 0x1C)
+ * Marvell 88E6xxx Switch Global 2 Registers support (device address
+ * 0x1C)
  *
  * Copyright (c) 2008 Marvell Semiconductor
  *
@@ -11,6 +12,7 @@
  * (at your option) any later version.
  */
 
+#include <linux/irqdomain.h>
 #include "mv88e6xxx.h"
 #include "global2.h"
 
@@ -417,6 +419,141 @@ int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip, int addr, int reg,
 	return mv88e6xxx_g2_smi_phy_cmd(chip, cmd);
 }
 
+static void mv88e6xxx_g2_irq_mask(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int n = d->hwirq;
+
+	chip->g2_irq.masked |= (1 << n);
+}
+
+static void mv88e6xxx_g2_irq_unmask(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+	unsigned int n = d->hwirq;
+
+	chip->g2_irq.masked &= ~(1 << n);
+}
+
+static irqreturn_t mv88e6xxx_g2_irq_thread_fn(int irq, void *dev_id)
+{
+	struct mv88e6xxx_chip *chip = dev_id;
+	unsigned int nhandled = 0;
+	unsigned int sub_irq;
+	unsigned int n;
+	int err;
+	u16 reg;
+
+	mutex_lock(&chip->reg_lock);
+	err = mv88e6xxx_g2_read(chip, GLOBAL2_INT_SOURCE, &reg);
+	mutex_unlock(&chip->reg_lock);
+	if (err)
+		goto out;
+
+	for (n = 0; n < 16; ++n) {
+		if (reg & (1 << n)) {
+			sub_irq = irq_find_mapping(chip->g2_irq.domain, n);
+			handle_nested_irq(sub_irq);
+			++nhandled;
+		}
+	}
+out:
+	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
+}
+
+static void mv88e6xxx_g2_irq_bus_lock(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+
+	mutex_lock(&chip->reg_lock);
+}
+
+static void mv88e6xxx_g2_irq_bus_sync_unlock(struct irq_data *d)
+{
+	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
+
+	mv88e6xxx_g2_write(chip, GLOBAL2_INT_MASK, ~chip->g2_irq.masked);
+
+	mutex_unlock(&chip->reg_lock);
+}
+
+static struct irq_chip mv88e6xxx_g2_irq_chip = {
+	.name			= "mv88e6xxx-g2",
+	.irq_mask		= mv88e6xxx_g2_irq_mask,
+	.irq_unmask		= mv88e6xxx_g2_irq_unmask,
+	.irq_bus_lock		= mv88e6xxx_g2_irq_bus_lock,
+	.irq_bus_sync_unlock	= mv88e6xxx_g2_irq_bus_sync_unlock,
+};
+
+static int mv88e6xxx_g2_irq_domain_map(struct irq_domain *d,
+				       unsigned int irq,
+				       irq_hw_number_t hwirq)
+{
+	struct mv88e6xxx_chip *chip = d->host_data;
+
+	irq_set_chip_data(irq, d->host_data);
+	irq_set_chip_and_handler(irq, &chip->g2_irq.chip, handle_level_irq);
+	irq_set_noprobe(irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops mv88e6xxx_g2_irq_domain_ops = {
+	.map	= mv88e6xxx_g2_irq_domain_map,
+	.xlate	= irq_domain_xlate_twocell,
+};
+
+void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip)
+{
+	int irq, virq;
+
+	for (irq = 0; irq < 16; irq++) {
+		virq = irq_find_mapping(chip->g2_irq.domain, irq);
+		irq_dispose_mapping(virq);
+	}
+
+	irq_domain_remove(chip->g2_irq.domain);
+}
+
+int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip)
+{
+	int device_irq;
+	int err, irq;
+
+	if (!chip->dev->of_node)
+		return -EINVAL;
+
+	chip->g2_irq.domain = irq_domain_add_simple(
+		chip->dev->of_node, 16, 0, &mv88e6xxx_g2_irq_domain_ops, chip);
+	if (!chip->g2_irq.domain)
+		return -ENOMEM;
+
+	for (irq = 0; irq < 16; irq++)
+		irq_create_mapping(chip->g2_irq.domain, irq);
+
+	chip->g2_irq.chip = mv88e6xxx_g2_irq_chip;
+	chip->g2_irq.masked = ~0;
+
+	device_irq = irq_find_mapping(chip->g1_irq.domain,
+				      GLOBAL_STATUS_IRQ_DEVICE);
+	if (device_irq < 0) {
+		err = device_irq;
+		goto out;
+	}
+
+	err = devm_request_threaded_irq(chip->dev, device_irq, NULL,
+					mv88e6xxx_g2_irq_thread_fn,
+					IRQF_ONESHOT, "mv88e6xxx-g1", chip);
+	if (err)
+		goto out;
+
+	return 0;
+out:
+	mv88e6xxx_g2_irq_free(chip);
+
+	return err;
+}
+
 int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
 {
 	u16 reg;

drivers/net/dsa/mv88e6xxx/global2.h

@@ -33,6 +33,8 @@ 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_setup(struct mv88e6xxx_chip *chip);
+int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip);
+void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip);
 
 #else /* !CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
 
@@ -83,6 +85,15 @@ static inline int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
 	return -EOPNOTSUPP;
 }
 
+static inline int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip)
+{
+}
+
 #endif /* CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
 
 #endif /* _MV88E6XXX_GLOBAL2_H */

drivers/net/dsa/mv88e6xxx/mv88e6xxx.h

@@ -13,6 +13,7 @@
 #define __MV88E6XXX_H
 
 #include <linux/if_vlan.h>
+#include <linux/irq.h>
 #include <linux/gpio/consumer.h>
 
 #ifndef UINT64_MAX
@@ -167,6 +168,15 @@
 #define GLOBAL_STATUS_PPU_INITIALIZING	(0x1 << 14)
 #define GLOBAL_STATUS_PPU_DISABLED	(0x2 << 14)
 #define GLOBAL_STATUS_PPU_POLLING	(0x3 << 14)
+#define GLOBAL_STATUS_IRQ_AVB		8
+#define GLOBAL_STATUS_IRQ_DEVICE	7
+#define GLOBAL_STATUS_IRQ_STATS		6
+#define GLOBAL_STATUS_IRQ_VTU_PROBLEM	5
+#define GLOBAL_STATUS_IRQ_VTU_DONE	4
+#define GLOBAL_STATUS_IRQ_ATU_PROBLEM	3
+#define GLOBAL_STATUS_IRQ_ATU_DONE	2
+#define GLOBAL_STATUS_IRQ_TCAM_DONE	1
+#define GLOBAL_STATUS_IRQ_EEPROM_DONE	0
 #define GLOBAL_MAC_01		0x01
 #define GLOBAL_MAC_23		0x02
 #define GLOBAL_MAC_45		0x03
@@ -417,6 +427,7 @@ enum mv88e6xxx_cap {
 	 * The device contains a second set of global 16-bit registers.
 	 */
 	MV88E6XXX_CAP_GLOBAL2,
+	MV88E6XXX_CAP_G2_INT,		/* (0x00) Interrupt Status */
 	MV88E6XXX_CAP_G2_MGMT_EN_2X,	/* (0x02) MGMT Enable Register 2x */
 	MV88E6XXX_CAP_G2_MGMT_EN_0X,	/* (0x03) MGMT Enable Register 0x */
 	MV88E6XXX_CAP_G2_IRL_CMD,	/* (0x09) Ingress Rate Command */
@@ -464,6 +475,7 @@ enum mv88e6xxx_cap {
 #define MV88E6XXX_FLAG_G1_VTU_FID	BIT_ULL(MV88E6XXX_CAP_G1_VTU_FID)
 
 #define MV88E6XXX_FLAG_GLOBAL2		BIT_ULL(MV88E6XXX_CAP_GLOBAL2)
+#define MV88E6XXX_FLAG_G2_INT		BIT_ULL(MV88E6XXX_CAP_G2_INT)
 #define MV88E6XXX_FLAG_G2_MGMT_EN_2X	BIT_ULL(MV88E6XXX_CAP_G2_MGMT_EN_2X)
 #define MV88E6XXX_FLAG_G2_MGMT_EN_0X	BIT_ULL(MV88E6XXX_CAP_G2_MGMT_EN_0X)
 #define MV88E6XXX_FLAG_G2_IRL_CMD	BIT_ULL(MV88E6XXX_CAP_G2_IRL_CMD)
@@ -524,6 +536,7 @@ enum mv88e6xxx_cap {
 	(MV88E6XXX_FLAG_G1_ATU_FID |	\
 	 MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
+	 MV88E6XXX_FLAG_G2_INT |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
 	 MV88E6XXX_FLAG_G2_POT |	\
@@ -536,6 +549,7 @@ enum mv88e6xxx_cap {
 
 #define MV88E6XXX_FLAGS_FAMILY_6185	\
 	(MV88E6XXX_FLAG_GLOBAL2 |	\
+	 MV88E6XXX_FLAG_G2_INT |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
 	 MV88E6XXX_FLAGS_MULTI_CHIP |	\
 	 MV88E6XXX_FLAG_PPU |		\
@@ -561,6 +575,7 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAG_G1_ATU_FID |	\
 	 MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
+	 MV88E6XXX_FLAG_G2_INT |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
 	 MV88E6XXX_FLAG_G2_POT |	\
@@ -578,6 +593,7 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAG_G1_ATU_FID |	\
 	 MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
+	 MV88E6XXX_FLAG_G2_INT |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
 	 MV88E6XXX_FLAG_G2_POT |	\
@@ -602,6 +618,7 @@ struct mv88e6xxx_info {
 	unsigned int port_base_addr;
 	unsigned int global1_addr;
 	unsigned int age_time_coeff;
+	unsigned int g1_irqs;
 	unsigned long long flags;
 	const struct mv88e6xxx_ops *ops;
 };
@@ -628,6 +645,13 @@ struct mv88e6xxx_priv_port {
 	struct net_device *bridge_dev;
 };
 
+struct mv88e6xxx_irq {
+	u16 masked;
+	struct irq_chip chip;
+	struct irq_domain *domain;
+	unsigned int nirqs;
+};
+
 struct mv88e6xxx_chip {
 	const struct mv88e6xxx_info *info;
 
@@ -677,6 +701,13 @@ struct mv88e6xxx_chip {
 
 	/* And the MDIO bus itself */
 	struct mii_bus *mdio_bus;
+
+	/* There can be two interrupt controllers, which are chained
+	 * off a GPIO as interrupt source
+	 */
+	struct mv88e6xxx_irq g1_irq;
+	struct mv88e6xxx_irq g2_irq;
+	int irq;
 };
 
 struct mv88e6xxx_bus_ops {

drivers/net/phy/phy.c

@@ -664,7 +664,7 @@ static void phy_error(struct phy_device *phydev)
  * @phy_dat: phy_device pointer
  *
  * Description: When a PHY interrupt occurs, the handler disables
- * interrupts, and schedules a work task to clear the interrupt.
+ * interrupts, and uses phy_change to handle the interrupt.
  */
 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 {
@@ -673,15 +673,10 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 	if (PHY_HALTED == phydev->state)
 		return IRQ_NONE;		/* It can't be ours.  */
 
-	/* The MDIO bus is not allowed to be written in interrupt
-	 * context, so we need to disable the irq here.  A work
-	 * queue will write the PHY to disable and clear the
-	 * interrupt, and then reenable the irq line.
-	 */
 	disable_irq_nosync(irq);
 	atomic_inc(&phydev->irq_disable);
 
-	queue_work(system_power_efficient_wq, &phydev->phy_queue);
+	phy_change(phydev);
 
 	return IRQ_HANDLED;
 }
@@ -739,10 +734,9 @@ static int phy_disable_interrupts(struct phy_device *phydev)
 int phy_start_interrupts(struct phy_device *phydev)
 {
 	atomic_set(&phydev->irq_disable, 0);
-	if (request_irq(phydev->irq, phy_interrupt,
-				IRQF_SHARED,
-				"phy_interrupt",
-				phydev) < 0) {
+	if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
+				 IRQF_ONESHOT | IRQF_SHARED,
+				 phydev_name(phydev), phydev) < 0) {
 		pr_warn("%s: Can't get IRQ %d (PHY)\n",
 			phydev->mdio.bus->name, phydev->irq);
 		phydev->irq = PHY_POLL;
@@ -766,12 +760,6 @@ int phy_stop_interrupts(struct phy_device *phydev)
 
 	free_irq(phydev->irq, phydev);
 
-	/* Cannot call flush_scheduled_work() here as desired because
-	 * of rtnl_lock(), but we do not really care about what would
-	 * be done, except from enable_irq(), so cancel any work
-	 * possibly pending and take care of the matter below.
-	 */
-	cancel_work_sync(&phydev->phy_queue);
 	/* If work indeed has been cancelled, disable_irq() will have
 	 * been left unbalanced from phy_interrupt() and enable_irq()
 	 * has to be called so that other devices on the line work.
@@ -784,14 +772,11 @@ int phy_stop_interrupts(struct phy_device *phydev)
 EXPORT_SYMBOL(phy_stop_interrupts);
 
 /**
- * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
- * @work: work_struct that describes the work to be done
+ * phy_change - Called by the phy_interrupt to handle PHY changes
+ * @phydev: phy_device struct that interrupted
  */
-void phy_change(struct work_struct *work)
+void phy_change(struct phy_device *phydev)
 {
-	struct phy_device *phydev =
-		container_of(work, struct phy_device, phy_queue);
-
 	if (phy_interrupt_is_valid(phydev)) {
 		if (phydev->drv->did_interrupt &&
 		    !phydev->drv->did_interrupt(phydev))
@@ -832,6 +817,18 @@ void phy_change(struct work_struct *work)
 	phy_error(phydev);
 }
 
+/**
+ * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
+ * @work: work_struct that describes the work to be done
+ */
+void phy_change_work(struct work_struct *work)
+{
+	struct phy_device *phydev =
+		container_of(work, struct phy_device, phy_queue);
+
+	phy_change(phydev);
+}
+
 /**
  * phy_stop - Bring down the PHY link, and stop checking the status
  * @phydev: target phy_device struct
@@ -1116,6 +1113,15 @@ void phy_state_machine(struct work_struct *work)
 				   PHY_STATE_TIME * HZ);
 }
 
+/**
+ * phy_mac_interrupt - MAC says the link has changed
+ * @phydev: phy_device struct with changed link
+ * @new_link: Link is Up/Down.
+ *
+ * Description: The MAC layer is able indicate there has been a change
+ *   in the PHY link status. Set the new link status, and trigger the
+ *   state machine, work a work queue.
+ */
 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
 {
 	phydev->link = new_link;

drivers/net/phy/phy_device.c

@@ -347,7 +347,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 
 	mutex_init(&dev->lock);
 	INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
-	INIT_WORK(&dev->phy_queue, phy_change);
+	INIT_WORK(&dev->phy_queue, phy_change_work);
 
 	/* Request the appropriate module unconditionally; don't
 	 * bother trying to do so only if it isn't already loaded,

include/linux/phy.h

@@ -343,7 +343,7 @@ struct phy_c45_device_ids {
  * giving up on the current attempt at acquiring a link
  * irq: IRQ number of the PHY's interrupt (-1 if none)
  * phy_timer: The timer for handling the state machine
- * phy_queue: A work_queue for the interrupt
+ * phy_queue: A work_queue for the phy_mac_interrupt
  * attached_dev: The attached enet driver's device instance ptr
  * adjust_link: Callback for the enet controller to respond to
  * changes in the link state.
@@ -802,7 +802,8 @@ int phy_driver_register(struct phy_driver *new_driver, struct module *owner);
 int phy_drivers_register(struct phy_driver *new_driver, int n,
 			 struct module *owner);
 void phy_state_machine(struct work_struct *work);
-void phy_change(struct work_struct *work);
+void phy_change(struct phy_device *phydev);
+void phy_change_work(struct work_struct *work);
 void phy_mac_interrupt(struct phy_device *phydev, int new_link);
 void phy_start_machine(struct phy_device *phydev);
 void phy_stop_machine(struct phy_device *phydev);