[PATCH net-next 2/4] net: dsa: microchip: support global switch interrupt in KSZ DSA driver

[<Tristram.Ha@microchip.com>]

From: Tristram Ha <tristram.ha@microchip.com>

The KSZ9477 DSA driver outsources interrupt handling to other drivers
such as PHY, but the switch driver still needs to handle some interrupts
itself.  This patch prepares the common code to allow specific switch
drivers to handle all switch interrupts.

The port interrupt handling uses the same function as used by the global
switch interrupt, so the port variable is used to differentiate that.

Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 15 ++++++++++++++-
 drivers/net/dsa/microchip/ksz_common.h |  5 ++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 1491099528be..f328c97f27d1 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2,7 +2,7 @@
 /*
  * Microchip switch driver main logic
  *
- * Copyright (C) 2017-2019 Microchip Technology Inc.
+ * Copyright (C) 2017-2024 Microchip Technology Inc.
  */
 
 #include <linux/delay.h>
@@ -2257,6 +2257,12 @@ static irqreturn_t ksz_irq_thread_fn(int irq, void *dev_id)
 	if (ret)
 		goto out;
 
+	if (dev->dev_ops->handle_irq) {
+		ret = dev->dev_ops->handle_irq(dev, kirq->port, &data);
+		if (ret == IRQ_HANDLED)
+			++nhandled;
+	}
+
 	for (n = 0; n < kirq->nirqs; ++n) {
 		if (data & BIT(n)) {
 			sub_irq = irq_find_mapping(kirq->domain, n);
@@ -2300,6 +2306,7 @@ static int ksz_girq_setup(struct ksz_device *dev)
 {
 	struct ksz_irq *girq = &dev->girq;
 
+	girq->port = 0;
 	girq->nirqs = dev->info->port_cnt;
 	girq->reg_mask = REG_SW_PORT_INT_MASK__1;
 	girq->reg_status = REG_SW_PORT_INT_STATUS__1;
@@ -2314,6 +2321,7 @@ static int ksz_pirq_setup(struct ksz_device *dev, u8 p)
 {
 	struct ksz_irq *pirq = &dev->ports[p].pirq;
 
+	pirq->port = p + 1;
 	pirq->nirqs = dev->info->port_nirqs;
 	pirq->reg_mask = dev->dev_ops->get_port_addr(p, REG_PORT_INT_MASK);
 	pirq->reg_status = dev->dev_ops->get_port_addr(p, REG_PORT_INT_STATUS);
@@ -2419,6 +2427,11 @@ static int ksz_setup(struct dsa_switch *ds)
 	if (ret)
 		goto out_ptp_clock_unregister;
 
+	if (dev->irq > 0) {
+		if (dev->dev_ops->enable_irq)
+			dev->dev_ops->enable_irq(dev);
+	}
+
 	/* start switch */
 	regmap_update_bits(ksz_regmap_8(dev), regs[S_START_CTRL],
 			   SW_START, SW_START);
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 5f0a628b9849..a2547646026f 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /* Microchip switch driver common header
  *
- * Copyright (C) 2017-2019 Microchip Technology Inc.
+ * Copyright (C) 2017-2024 Microchip Technology Inc.
  */
 
 #ifndef __KSZ_COMMON_H
@@ -99,6 +99,7 @@ struct ksz_irq {
 	int irq_num;
 	char name[16];
 	struct ksz_device *dev;
+	u8 port;
 };
 
 struct ksz_ptp_irq {
@@ -373,6 +374,8 @@ struct ksz_dev_ops {
 	int (*reset)(struct ksz_device *dev);
 	int (*init)(struct ksz_device *dev);
 	void (*exit)(struct ksz_device *dev);
+	void (*enable_irq)(struct ksz_device *dev);
+	irqreturn_t (*handle_irq)(struct ksz_device *dev, u8 port, u8 *data);
 };
 
 struct ksz_device *ksz_switch_alloc(struct device *base, void *priv);
-- 
2.34.1