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Date: Wed, 30 Dec 2020 12:22:08 +0800
From: DENG Qingfang <dqfext@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Landen Chao <Landen.Chao@...iatek.com>,
Marc Zyngier <maz@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Russell King <linux@...linux.org.uk>,
Sean Wang <sean.wang@...iatek.com>,
Thomas Gleixner <tglx@...utronix.de>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: Weijie Gao <weijie.gao@...iatek.com>,
Chuanhong Guo <gch981213@...il.com>,
Linus Walleij <linus.walleij@...aro.org>,
René van Dorst <opensource@...rst.com>
Subject: Registering IRQ for MT7530 internal PHYs
Hi,
I added MT7530 IRQ support and registered its internal PHYs to IRQ.
It works but my patch used two hacks.
1. Removed phy_drv_supports_irq check, because config_intr and
handle_interrupt are not set for Generic PHY.
2. Allocated ds->slave_mii_bus before calling ds->ops->setup, because
we cannot call dsa_slave_mii_bus_init which is private.
Any better ideas?
Regards,
Qingfang
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index a67cac15a724..d59a8c50ede3 100644
--- 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>
@@ -1639,6 +1640,125 @@ mtk_get_tag_protocol(struct dsa_switch *ds, int port,
}
}
+static irqreturn_t
+mt7530_irq(int irq, void *data)
+{
+ struct mt7530_priv *priv = data;
+ bool handled = false;
+ int phy;
+ u32 val;
+
+ val = mt7530_read(priv, MT7530_SYS_INT_STS);
+ mt7530_write(priv, MT7530_SYS_INT_STS, val);
+
+ dev_info_ratelimited(priv->dev, "interrupt status: 0x%08x\n", val);
+ dev_info_ratelimited(priv->dev, "interrupt enable: 0x%08x\n", mt7530_read(priv, MT7530_SYS_INT_EN));
+
+ for (phy = 0; phy < MT7530_NUM_PHYS; phy++) {
+ if (val & BIT(phy)) {
+ unsigned int child_irq;
+
+ child_irq = irq_find_mapping(priv->irq_domain, phy);
+ handle_nested_irq(child_irq);
+ handled = true;
+ }
+ }
+
+ return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+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(&priv->reg_mutex);
+}
+
+static void mt7530_irq_bus_sync_unlock(struct irq_data *d)
+{
+ struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
+
+ mt7530_write(priv, MT7530_SYS_INT_EN, priv->irq_enable);
+ mutex_unlock(&priv->reg_mutex);
+}
+
+static struct irq_chip mt7530_irq_chip = {
+ .name = MT7530_NAME,
+ .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_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_irq_init(struct mt7530_priv *priv)
+{
+ struct mii_bus *bus = priv->ds->slave_mii_bus;
+ struct device *dev = priv->dev;
+ struct device_node *np = dev->of_node;
+ int parent_irq;
+ int phy, ret;
+
+ parent_irq = of_irq_get(np, 0);
+ if (parent_irq <= 0) {
+ dev_err(dev, "failed to get parent IRQ: %d\n", parent_irq);
+ return;
+ }
+
+ mt7530_set(priv, MT7530_TOP_SIG_CTRL, TOP_SIG_CTRL_NORMAL);
+ ret = devm_request_threaded_irq(dev, parent_irq, NULL, mt7530_irq,
+ IRQF_ONESHOT, MT7530_NAME, priv);
+ if (ret) {
+ dev_err(dev, "failed to request IRQ: %d\n", ret);
+ return;
+ }
+
+ 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;
+ }
+
+ /* IRQ for internal PHYs */
+ for (phy = 0; phy < MT7530_NUM_PHYS; phy++) {
+ unsigned int irq = irq_create_mapping(priv->irq_domain, phy);
+
+ irq_set_parent(irq, parent_irq);
+ bus->irq[phy] = irq;
+ }
+}
+
static int
mt7530_setup(struct dsa_switch *ds)
{
@@ -2578,8 +2698,13 @@ 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);
+ /* Setup interrupt */
+ if (!ret)
+ mt7530_irq_init(priv);
+
+ return ret;
}
static int
@@ -2780,6 +2905,9 @@ mt7530_remove(struct mdio_device *mdiodev)
dev_err(priv->dev, "Failed to disable io pwr: %d\n",
ret);
+ if (priv->irq_domain)
+ irq_domain_remove(priv->irq_domain);
+
dsa_unregister_switch(priv->ds);
mutex_destroy(&priv->reg_mutex);
}
@@ -2788,7 +2916,7 @@ static struct mdio_driver mt7530_mdio_driver = {
.probe = mt7530_probe,
.remove = mt7530_remove,
.mdiodrv.driver = {
- .name = "mt7530",
+ .name = MT7530_NAME,
.of_match_table = mt7530_of_match,
},
};
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 32d8969b3ace..b1988d8085bb 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -6,7 +6,10 @@
#ifndef __MT7530_H
#define __MT7530_H
+#define MT7530_NAME "mt7530"
+
#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
@@ -380,6 +383,12 @@ 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)
@@ -761,6 +770,8 @@ struct mt7530_priv {
struct mt7530_port ports[MT7530_NUM_PORTS];
/* protect among processes for registers access*/
struct mutex reg_mutex;
+ struct irq_domain *irq_domain;
+ u32 irq_enable;
};
struct mt7530_hw_vlan_entry {
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 80c2e646c093..cdddc27e2df7 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2846,12 +2846,6 @@ static int phy_probe(struct device *dev)
phydev->drv = phydrv;
- /* Disable the interrupt if the PHY doesn't support it
- * but the interrupt is still a valid one
- */
- if (!phy_drv_supports_irq(phydrv) && phy_interrupt_is_valid(phydev))
- phydev->irq = PHY_POLL;
-
if (phydrv->flags & PHY_IS_INTERNAL)
phydev->is_internal = true;
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 183003e45762..ef5db1106581 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -448,19 +448,19 @@ static int dsa_switch_setup(struct dsa_switch *ds)
if (err)
goto unregister_devlink_ports;
+ ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
+ if (!ds->slave_mii_bus) {
+ err = -ENOMEM;
+ goto unregister_notifier;
+ }
+
err = ds->ops->setup(ds);
if (err < 0)
goto unregister_notifier;
devlink_params_publish(ds->devlink);
- if (!ds->slave_mii_bus && ds->ops->phy_read) {
- ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
- if (!ds->slave_mii_bus) {
- err = -ENOMEM;
- goto unregister_notifier;
- }
-
+ if (ds->ops->phy_read) {
dsa_slave_mii_bus_init(ds);
err = mdiobus_register(ds->slave_mii_bus);
--
2.25.1
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