--- /dev/null
+From ba751e28d44255744a30190faad0ca09b455c44d Mon Sep 17 00:00:00 2001
+From: DENG Qingfang <dqfext@gmail.com>
+Date: Wed, 19 May 2021 11:32:00 +0800
+Subject: [PATCH] net: dsa: mt7530: add interrupt support
+
+Add support for MT7530 interrupt controller to handle internal PHYs.
+In order to assign an IRQ number to each PHY, the registration of MDIO bus
+is also done in this driver.
+
+Signed-off-by: DENG Qingfang <dqfext@gmail.com>
+Reviewed-by: Andrew Lunn <andrew@lunn.ch>
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/dsa/mt7530.c | 264 +++++++++++++++++++++++++++++++++++----
+ drivers/net/dsa/mt7530.h | 20 ++-
+ 2 files changed, 256 insertions(+), 28 deletions(-)
+
+--- a/drivers/net/dsa/mt7530.c
++++ b/drivers/net/dsa/mt7530.c
+@@ -10,6 +10,7 @@
+ #include <linux/mfd/syscon.h>
+ #include <linux/module.h>
+ #include <linux/netdevice.h>
++#include <linux/of_irq.h>
+ #include <linux/of_mdio.h>
+ #include <linux/of_net.h>
+ #include <linux/of_platform.h>
+@@ -602,18 +603,14 @@ mt7530_mib_reset(struct dsa_switch *ds)
+ mt7530_write(priv, MT7530_MIB_CCR, CCR_MIB_ACTIVATE);
+ }
+
+-static int mt7530_phy_read(struct dsa_switch *ds, int port, int regnum)
++static int mt7530_phy_read(struct mt7530_priv *priv, int port, int regnum)
+ {
+- struct mt7530_priv *priv = ds->priv;
+-
+ return mdiobus_read_nested(priv->bus, port, regnum);
+ }
+
+-static int mt7530_phy_write(struct dsa_switch *ds, int port, int regnum,
++static int mt7530_phy_write(struct mt7530_priv *priv, int port, int regnum,
+ u16 val)
+ {
+- struct mt7530_priv *priv = ds->priv;
+-
+ return mdiobus_write_nested(priv->bus, port, regnum, val);
+ }
+
+@@ -791,9 +788,8 @@ out:
+ }
+
+ static int
+-mt7531_ind_phy_read(struct dsa_switch *ds, int port, int regnum)
++mt7531_ind_phy_read(struct mt7530_priv *priv, int port, int regnum)
+ {
+- struct mt7530_priv *priv = ds->priv;
+ int devad;
+ int ret;
+
+@@ -809,10 +805,9 @@ mt7531_ind_phy_read(struct dsa_switch *d
+ }
+
+ static int
+-mt7531_ind_phy_write(struct dsa_switch *ds, int port, int regnum,
++mt7531_ind_phy_write(struct mt7530_priv *priv, int port, int regnum,
+ u16 data)
+ {
+- struct mt7530_priv *priv = ds->priv;
+ int devad;
+ int ret;
+
+@@ -828,6 +823,22 @@ mt7531_ind_phy_write(struct dsa_switch *
+ return ret;
+ }
+
++static int
++mt753x_phy_read(struct mii_bus *bus, int port, int regnum)
++{
++ struct mt7530_priv *priv = bus->priv;
++
++ return priv->info->phy_read(priv, port, regnum);
++}
++
++static int
++mt753x_phy_write(struct mii_bus *bus, int port, int regnum, u16 val)
++{
++ struct mt7530_priv *priv = bus->priv;
++
++ return priv->info->phy_write(priv, port, regnum, val);
++}
++
+ static void
+ mt7530_get_strings(struct dsa_switch *ds, int port, u32 stringset,
+ uint8_t *data)
+@@ -1824,6 +1835,210 @@ mt7530_setup_gpio(struct mt7530_priv *pr
+ return devm_gpiochip_add_data(dev, gc, priv);
+ }
+
++static irqreturn_t
++mt7530_irq_thread_fn(int irq, void *dev_id)
++{
++ struct mt7530_priv *priv = dev_id;
++ bool handled = false;
++ u32 val;
++ int p;
++
++ mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
++ val = mt7530_mii_read(priv, MT7530_SYS_INT_STS);
++ mt7530_mii_write(priv, MT7530_SYS_INT_STS, val);
++ mutex_unlock(&priv->bus->mdio_lock);
++
++ for (p = 0; p < MT7530_NUM_PHYS; p++) {
++ if (BIT(p) & val) {
++ unsigned int irq;
++
++ irq = irq_find_mapping(priv->irq_domain, p);
++ handle_nested_irq(irq);
++ handled = true;
++ }
++ }
++
++ return IRQ_RETVAL(handled);
++}
++
++static void
++mt7530_irq_mask(struct irq_data *d)
++{
++ struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
++
++ priv->irq_enable &= ~BIT(d->hwirq);
++}
++
++static void
++mt7530_irq_unmask(struct irq_data *d)
++{
++ struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
++
++ priv->irq_enable |= BIT(d->hwirq);
++}
++
++static void
++mt7530_irq_bus_lock(struct irq_data *d)
++{
++ struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
++
++ mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
++}
++
++static void
++mt7530_irq_bus_sync_unlock(struct irq_data *d)
++{
++ struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
++
++ mt7530_mii_write(priv, MT7530_SYS_INT_EN, priv->irq_enable);
++ mutex_unlock(&priv->bus->mdio_lock);
++}
++
++static struct irq_chip mt7530_irq_chip = {
++ .name = KBUILD_MODNAME,
++ .irq_mask = mt7530_irq_mask,
++ .irq_unmask = mt7530_irq_unmask,
++ .irq_bus_lock = mt7530_irq_bus_lock,
++ .irq_bus_sync_unlock = mt7530_irq_bus_sync_unlock,
++};
++
++static int
++mt7530_irq_map(struct irq_domain *domain, unsigned int irq,
++ irq_hw_number_t hwirq)
++{
++ irq_set_chip_data(irq, domain->host_data);
++ irq_set_chip_and_handler(irq, &mt7530_irq_chip, handle_simple_irq);
++ irq_set_nested_thread(irq, true);
++ irq_set_noprobe(irq);
++
++ return 0;
++}
++
++static const struct irq_domain_ops mt7530_irq_domain_ops = {
++ .map = mt7530_irq_map,
++ .xlate = irq_domain_xlate_onecell,
++};
++
++static void
++mt7530_setup_mdio_irq(struct mt7530_priv *priv)
++{
++ struct dsa_switch *ds = priv->ds;
++ int p;
++
++ for (p = 0; p < MT7530_NUM_PHYS; p++) {
++ if (BIT(p) & ds->phys_mii_mask) {
++ unsigned int irq;
++
++ irq = irq_create_mapping(priv->irq_domain, p);
++ ds->slave_mii_bus->irq[p] = irq;
++ }
++ }
++}
++
++static int
++mt7530_setup_irq(struct mt7530_priv *priv)
++{
++ struct device *dev = priv->dev;
++ struct device_node *np = dev->of_node;
++ int ret;
++
++ if (!of_property_read_bool(np, "interrupt-controller")) {
++ dev_info(dev, "no interrupt support\n");
++ return 0;
++ }
++
++ priv->irq = of_irq_get(np, 0);
++ if (priv->irq <= 0) {
++ dev_err(dev, "failed to get parent IRQ: %d\n", priv->irq);
++ return priv->irq ? : -EINVAL;
++ }
++
++ priv->irq_domain = irq_domain_add_linear(np, MT7530_NUM_PHYS,
++ &mt7530_irq_domain_ops, priv);
++ if (!priv->irq_domain) {
++ dev_err(dev, "failed to create IRQ domain\n");
++ return -ENOMEM;
++ }
++
++ /* This register must be set for MT7530 to properly fire interrupts */
++ if (priv->id != ID_MT7531)
++ mt7530_set(priv, MT7530_TOP_SIG_CTRL, TOP_SIG_CTRL_NORMAL);
++
++ ret = request_threaded_irq(priv->irq, NULL, mt7530_irq_thread_fn,
++ IRQF_ONESHOT, KBUILD_MODNAME, priv);
++ if (ret) {
++ irq_domain_remove(priv->irq_domain);
++ dev_err(dev, "failed to request IRQ: %d\n", ret);
++ return ret;
++ }
++
++ return 0;
++}
++
++static void
++mt7530_free_mdio_irq(struct mt7530_priv *priv)
++{
++ int p;
++
++ for (p = 0; p < MT7530_NUM_PHYS; p++) {
++ if (BIT(p) & priv->ds->phys_mii_mask) {
++ unsigned int irq;
++
++ irq = irq_find_mapping(priv->irq_domain, p);
++ irq_dispose_mapping(irq);
++ }
++ }
++}
++
++static void
++mt7530_free_irq_common(struct mt7530_priv *priv)
++{
++ free_irq(priv->irq, priv);
++ irq_domain_remove(priv->irq_domain);
++}
++
++static void
++mt7530_free_irq(struct mt7530_priv *priv)
++{
++ mt7530_free_mdio_irq(priv);
++ mt7530_free_irq_common(priv);
++}
++
++static int
++mt7530_setup_mdio(struct mt7530_priv *priv)
++{
++ struct dsa_switch *ds = priv->ds;
++ struct device *dev = priv->dev;
++ struct mii_bus *bus;
++ static int idx;
++ int ret;
++
++ bus = devm_mdiobus_alloc(dev);
++ if (!bus)
++ return -ENOMEM;
++
++ ds->slave_mii_bus = bus;
++ bus->priv = priv;
++ bus->name = KBUILD_MODNAME "-mii";
++ snprintf(bus->id, MII_BUS_ID_SIZE, KBUILD_MODNAME "-%d", idx++);
++ bus->read = mt753x_phy_read;
++ bus->write = mt753x_phy_write;
++ bus->parent = dev;
++ bus->phy_mask = ~ds->phys_mii_mask;
++
++ if (priv->irq)
++ mt7530_setup_mdio_irq(priv);
++
++ ret = devm_mdiobus_register(dev, bus);
++ if (ret) {
++ dev_err(dev, "failed to register MDIO bus: %d\n", ret);
++ if (priv->irq)
++ mt7530_free_mdio_irq(priv);
++ }
++
++ return ret;
++}
++
+ static int
+ mt7530_setup(struct dsa_switch *ds)
+ {
+@@ -2798,24 +3013,20 @@ static int
+ mt753x_setup(struct dsa_switch *ds)
+ {
+ struct mt7530_priv *priv = ds->priv;
++ int ret = priv->info->sw_setup(ds);
+
+- return priv->info->sw_setup(ds);
+-}
+-
+-static int
+-mt753x_phy_read(struct dsa_switch *ds, int port, int regnum)
+-{
+- struct mt7530_priv *priv = ds->priv;
++ if (ret)
++ return ret;
+
+- return priv->info->phy_read(ds, port, regnum);
+-}
++ ret = mt7530_setup_irq(priv);
++ if (ret)
++ return ret;
+
+-static int
+-mt753x_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
+-{
+- struct mt7530_priv *priv = ds->priv;
++ ret = mt7530_setup_mdio(priv);
++ if (ret && priv->irq)
++ mt7530_free_irq_common(priv);
+
+- return priv->info->phy_write(ds, port, regnum, val);
++ return ret;
+ }
+
+ static int mt753x_get_mac_eee(struct dsa_switch *ds, int port,
+@@ -2852,8 +3063,6 @@ static const struct dsa_switch_ops mt753
+ .get_tag_protocol = mtk_get_tag_protocol,
+ .setup = mt753x_setup,
+ .get_strings = mt7530_get_strings,
+- .phy_read = mt753x_phy_read,
+- .phy_write = mt753x_phy_write,
+ .get_ethtool_stats = mt7530_get_ethtool_stats,
+ .get_sset_count = mt7530_get_sset_count,
+ .set_ageing_time = mt7530_set_ageing_time,
+@@ -3036,6 +3245,9 @@ mt7530_remove(struct mdio_device *mdiode
+ dev_err(priv->dev, "Failed to disable io pwr: %d\n",
+ ret);
+
++ if (priv->irq)
++ mt7530_free_irq(priv);
++
+ dsa_unregister_switch(priv->ds);
+ mutex_destroy(&priv->reg_mutex);
+ }
+--- a/drivers/net/dsa/mt7530.h
++++ b/drivers/net/dsa/mt7530.h
+@@ -7,6 +7,7 @@
+ #define __MT7530_H
+
+ #define MT7530_NUM_PORTS 7
++#define MT7530_NUM_PHYS 5
+ #define MT7530_CPU_PORT 6
+ #define MT7530_NUM_FDB_RECORDS 2048
+ #define MT7530_ALL_MEMBERS 0xff
+@@ -401,6 +402,12 @@ enum mt7531_sgmii_force_duplex {
+ #define SYS_CTRL_SW_RST BIT(1)
+ #define SYS_CTRL_REG_RST BIT(0)
+
++/* Register for system interrupt */
++#define MT7530_SYS_INT_EN 0x7008
++
++/* Register for system interrupt status */
++#define MT7530_SYS_INT_STS 0x700c
++
+ /* Register for PHY Indirect Access Control */
+ #define MT7531_PHY_IAC 0x701C
+ #define MT7531_PHY_ACS_ST BIT(31)
+@@ -722,6 +729,8 @@ static const char *p5_intf_modes(unsigne
+ }
+ }
+
++struct mt7530_priv;
++
+ /* struct mt753x_info - This is the main data structure for holding the specific
+ * part for each supported device
+ * @sw_setup: Holding the handler to a device initialization
+@@ -746,8 +755,8 @@ struct mt753x_info {
+ enum mt753x_id id;
+
+ int (*sw_setup)(struct dsa_switch *ds);
+- int (*phy_read)(struct dsa_switch *ds, int port, int regnum);
+- int (*phy_write)(struct dsa_switch *ds, int port, int regnum, u16 val);
++ int (*phy_read)(struct mt7530_priv *priv, int port, int regnum);
++ int (*phy_write)(struct mt7530_priv *priv, int port, int regnum, u16 val);
+ int (*pad_setup)(struct dsa_switch *ds, phy_interface_t interface);
+ int (*cpu_port_config)(struct dsa_switch *ds, int port);
+ bool (*phy_mode_supported)(struct dsa_switch *ds, int port,
+@@ -781,6 +790,10 @@ struct mt753x_info {
+ * registers
+ * @p6_interface Holding the current port 6 interface
+ * @p5_intf_sel: Holding the current port 5 interface select
++ *
++ * @irq: IRQ number of the switch
++ * @irq_domain: IRQ domain of the switch irq_chip
++ * @irq_enable: IRQ enable bits, synced to SYS_INT_EN
+ */
+ struct mt7530_priv {
+ struct device *dev;
+@@ -802,6 +815,9 @@ struct mt7530_priv {
+ struct mt7530_port ports[MT7530_NUM_PORTS];
+ /* protect among processes for registers access*/
+ struct mutex reg_mutex;
++ int irq;
++ struct irq_domain *irq_domain;
++ u32 irq_enable;
+ };
+
+ struct mt7530_hw_vlan_entry {
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