[RFC net-next 2/4] net: dsa: mt7530: add interrupt support
DENG Qingfang
dqfext at gmail.com
Tue Apr 6 15:18:17 BST 2021
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 at gmail.com>
---
drivers/net/dsa/mt7530.c | 203 +++++++++++++++++++++++++++++++++++----
drivers/net/dsa/mt7530.h | 18 +++-
2 files changed, 200 insertions(+), 21 deletions(-)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 2bd1bab71497..4c334e90090b 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>
@@ -596,18 +597,14 @@ 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);
}
@@ -785,9 +782,8 @@ mt7531_ind_c22_phy_write(struct mt7530_priv *priv, int port, int regnum,
}
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;
@@ -803,10 +799,9 @@ mt7531_ind_phy_read(struct dsa_switch *ds, int port, int regnum)
}
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;
@@ -1828,6 +1823,159 @@ mt7530_setup_gpio(struct mt7530_priv *priv)
}
#endif /* CONFIG_GPIOLIB */
+static irqreturn_t
+mt7530_irq(int irq, void *data)
+{
+ struct mt7530_priv *priv = data;
+ 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) {
+ handle_nested_irq(irq_find_mapping(priv->irq_domain,
+ p));
+ 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_noprobe(irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops mt7530_irq_domain_ops = {
+ .map = mt7530_irq_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static int
+mt7530_setup_mdiobus_irq(struct mt7530_priv *priv)
+{
+ struct device *dev = priv->dev;
+ struct device_node *np = dev->of_node;
+ struct dsa_switch *ds = priv->ds;
+ int parent_irq, ret, p;
+ struct mii_bus *bus;
+ static int idx;
+
+ 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 (!of_property_read_bool(np, "interrupt-controller")) {
+ dev_info(dev, "no interrupt support\n");
+ goto register_mdiobus;
+ }
+
+ parent_irq = of_irq_get(np, 0);
+ if (parent_irq <= 0) {
+ dev_err(dev, "failed to get parent IRQ: %d\n", parent_irq);
+ return parent_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 = devm_request_threaded_irq(dev, parent_irq, NULL, mt7530_irq,
+ IRQF_ONESHOT, KBUILD_MODNAME, priv);
+ if (ret) {
+ dev_err(dev, "failed to request IRQ: %d\n", ret);
+ return ret;
+ }
+
+ 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);
+ irq_set_parent(irq, parent_irq);
+ bus->irq[p] = irq;
+ }
+ }
+
+register_mdiobus:
+ ret = mdiobus_register(bus);
+ if (ret) {
+ dev_err(dev, "failed to register MDIO bus: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
static int
mt7530_setup(struct dsa_switch *ds)
{
@@ -2780,32 +2928,34 @@ static int
mt753x_setup(struct dsa_switch *ds)
{
struct mt7530_priv *priv = ds->priv;
+ int ret = priv->info->sw_setup(ds);
+
+ if (!ret)
+ ret = mt7530_setup_mdiobus_irq(priv);
- return priv->info->sw_setup(ds);
+ return ret;
}
static int
-mt753x_phy_read(struct dsa_switch *ds, int port, int regnum)
+mt753x_phy_read(struct mii_bus *bus, int port, int regnum)
{
- struct mt7530_priv *priv = ds->priv;
+ struct mt7530_priv *priv = bus->priv;
- return priv->info->phy_read(ds, port, regnum);
+ return priv->info->phy_read(priv, port, regnum);
}
static int
-mt753x_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
+mt753x_phy_write(struct mii_bus *bus, int port, int regnum, u16 val)
{
- struct mt7530_priv *priv = ds->priv;
+ struct mt7530_priv *priv = bus->priv;
- return priv->info->phy_write(ds, port, regnum, val);
+ return priv->info->phy_write(priv, port, regnum, val);
}
static const struct dsa_switch_ops mt7530_switch_ops = {
.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,
@@ -2986,6 +3136,21 @@ mt7530_remove(struct mdio_device *mdiodev)
dev_err(priv->dev, "Failed to disable io pwr: %d\n",
ret);
+ if (priv->irq_domain) {
+ 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);
+ }
+ }
+
+ irq_domain_remove(priv->irq_domain);
+ }
+
dsa_unregister_switch(priv->ds);
mutex_destroy(&priv->reg_mutex);
}
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index ec36ea5dfd57..e4429e152cde 100644
--- 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
@@ -381,6 +382,12 @@ 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)
@@ -702,6 +709,11 @@ static const char *p5_intf_modes(unsigned int p5_interface)
}
}
+/* Forward declaration */
+struct mt7530_priv;
+static int mt753x_phy_read(struct mii_bus *, int, int);
+static int mt753x_phy_write(struct mii_bus *, int, int, u16);
+
/* 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
@@ -726,8 +738,8 @@ 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,
@@ -782,6 +794,8 @@ 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 {
--
2.25.1
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