| Message ID | 20210412034237.2473017-3-dqfext@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | MT7530 interrupt support | expand |
On Mon, 12 Apr 2021 04:42:35 +0100, DENG Qingfang <dqfext@gmail.com> wrote: > > 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> > --- > RFC v3 -> RFC v4: > - No changes. > > drivers/net/dsa/Kconfig | 1 + > drivers/net/dsa/mt7530.c | 266 +++++++++++++++++++++++++++++++++++---- > drivers/net/dsa/mt7530.h | 20 ++- > 3 files changed, 258 insertions(+), 29 deletions(-) > > diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig > index a5f1aa911fe2..264384449f09 100644 > --- a/drivers/net/dsa/Kconfig > +++ b/drivers/net/dsa/Kconfig > @@ -36,6 +36,7 @@ config NET_DSA_LANTIQ_GSWIP > config NET_DSA_MT7530 > tristate "MediaTek MT753x and MT7621 Ethernet switch support" > select NET_DSA_TAG_MTK > + select MEDIATEK_PHY > help > This enables support for the MediaTek MT7530, MT7531, and MT7621 > Ethernet switch chips. > diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c > index 2bd1bab71497..da033004a74d 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; > > @@ -822,6 +817,22 @@ mt7531_ind_phy_write(struct dsa_switch *ds, int port, int regnum, > 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) > @@ -1828,6 +1839,211 @@ mt7530_setup_gpio(struct mt7530_priv *priv) > } > #endif /* CONFIG_GPIOLIB */ > > +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); This seems odd. Why aren't the MDIO IRQs allocated on demand as endpoint attached to this interrupt controller are being probed individually? In general, doing this allocation upfront is an indication that there is some missing information in the DT to perform the discovery. > + 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) Why not check for ID_MT7530 directly then? > + 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 = mdiobus_register(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) > { > @@ -2780,32 +2996,25 @@ static int > mt753x_setup(struct dsa_switch *ds) > { > struct mt7530_priv *priv = ds->priv; > + int ret = priv->info->sw_setup(ds); > + if (ret) > + return ret; > > - 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; > - > - 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 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, I don't get why this change is part of the interrupt support. This should probably be a separate patch. > .get_ethtool_stats = mt7530_get_ethtool_stats, > .get_sset_count = mt7530_get_sset_count, > .set_ageing_time = mt7530_set_ageing_time, > @@ -2986,6 +3195,9 @@ mt7530_remove(struct mdio_device *mdiodev) > 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); > } > diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h > index ec36ea5dfd57..62fcaabefba1 100644 > --- a/drivers/net/dsa/mt7530.h > +++ b/drivers/net/dsa/mt7530.h nit: Another thing is that I don't see why this include file exists at all. The only user is mt7530.c, so the two could be merged and reduce the clutter. Thanks, M.
On Mon, Apr 12, 2021 at 09:21:12AM +0100, Marc Zyngier wrote: > On Mon, 12 Apr 2021 04:42:35 +0100, > DENG Qingfang <dqfext@gmail.com> wrote: > > > > 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> > > --- > > RFC v3 -> RFC v4: > > - No changes. > > > > drivers/net/dsa/Kconfig | 1 + > > drivers/net/dsa/mt7530.c | 266 +++++++++++++++++++++++++++++++++++---- > > drivers/net/dsa/mt7530.h | 20 ++- > > 3 files changed, 258 insertions(+), 29 deletions(-) > > > > diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig > > index a5f1aa911fe2..264384449f09 100644 > > --- a/drivers/net/dsa/Kconfig > > +++ b/drivers/net/dsa/Kconfig > > @@ -36,6 +36,7 @@ config NET_DSA_LANTIQ_GSWIP > > config NET_DSA_MT7530 > > tristate "MediaTek MT753x and MT7621 Ethernet switch support" > > select NET_DSA_TAG_MTK > > + select MEDIATEK_PHY > > help > > This enables support for the MediaTek MT7530, MT7531, and MT7621 > > Ethernet switch chips. > > diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c > > index 2bd1bab71497..da033004a74d 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; > > > > @@ -822,6 +817,22 @@ mt7531_ind_phy_write(struct dsa_switch *ds, int port, int regnum, > > 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) > > @@ -1828,6 +1839,211 @@ mt7530_setup_gpio(struct mt7530_priv *priv) > > } > > #endif /* CONFIG_GPIOLIB */ > > > > +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); > > This seems odd. Why aren't the MDIO IRQs allocated on demand as > endpoint attached to this interrupt controller are being probed > individually? In general, doing this allocation upfront is an > indication that there is some missing information in the DT to perform > the discovery. This is what Andrew's mv88e6xxx does, actually. In addition, I also check the phys_mii_mask to avoid creating mappings for unused ports. Andrew, perhaps this can be done in DSA core? > > > + 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) > > Why not check for ID_MT7530 directly then? There is also ID_MT7621, introduced by Greg Ungerer, but it is basically MT7530 too. > > > + 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 = mdiobus_register(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) > > { > > @@ -2780,32 +2996,25 @@ static int > > mt753x_setup(struct dsa_switch *ds) > > { > > struct mt7530_priv *priv = ds->priv; > > + int ret = priv->info->sw_setup(ds); > > + if (ret) > > + return ret; > > > > - 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; > > - > > - 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 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, > > I don't get why this change is part of the interrupt support. This > should probably be a separate patch. These 2 functions are for DSA slave MII bus. Since the driver now manages the MII bus, mt753x_phy_{read,write} are assigned to bus->{read,write} instead. > > > .get_ethtool_stats = mt7530_get_ethtool_stats, > > .get_sset_count = mt7530_get_sset_count, > > .set_ageing_time = mt7530_set_ageing_time, > > @@ -2986,6 +3195,9 @@ mt7530_remove(struct mdio_device *mdiodev) > > 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); > > } > > diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h > > index ec36ea5dfd57..62fcaabefba1 100644 > > --- a/drivers/net/dsa/mt7530.h > > +++ b/drivers/net/dsa/mt7530.h > > nit: Another thing is that I don't see why this include file exists at > all. The only user is mt7530.c, so the two could be merged and reduce > the clutter. > > Thanks, > > M. > > -- > Without deviation from the norm, progress is not possible.
> > > +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); > > > > This seems odd. Why aren't the MDIO IRQs allocated on demand as > > endpoint attached to this interrupt controller are being probed > > individually? In general, doing this allocation upfront is an > > indication that there is some missing information in the DT to perform > > the discovery. > > This is what Andrew's mv88e6xxx does, actually. In addition, I also check > the phys_mii_mask to avoid creating mappings for unused ports. It can be done via DT, using the standard interrupt property, so long as you use of_mdiobus_register(np). But when you have an 7 port switch, and a nice simple mapping, port 0 PHY using interrupt 0, you can save a lot of device tree boilerplate by doing it in code. And when you have 4 of these switches, it gets very boring adding all the DT to just wire up the interrupts 28 interrupts. > Andrew, perhaps this can be done in DSA core? Not easily. It is not always a simple mapping like this. Two of the switches supported by mv88exxx offset the PHYs by 0x10. You really need the switch driver involved, with its detailed knowledge of the hardware. Andrew
On Tue, 13 Apr 2021 01:07:23 +0100, Andrew Lunn <andrew@lunn.ch> wrote: > > > > > +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); > > > > > > This seems odd. Why aren't the MDIO IRQs allocated on demand as > > > endpoint attached to this interrupt controller are being probed > > > individually? In general, doing this allocation upfront is an > > > indication that there is some missing information in the DT to perform > > > the discovery. > > > > This is what Andrew's mv88e6xxx does, actually. In addition, I also check > > the phys_mii_mask to avoid creating mappings for unused ports. > > It can be done via DT, using the standard interrupt property, so long > as you use of_mdiobus_register(np). > > But when you have an 7 port switch, and a nice simple mapping, port 0 > PHY using interrupt 0, you can save a lot of device tree boilerplate > by doing it in code. And when you have 4 of these switches, it gets > very boring adding all the DT to just wire up the interrupts 28 > interrupts. I guess this is depends whether the most usual case is to have all these interrupts being actively in use or not. Most interrupts only use a limited portion of their interrupt space at any given time. Allocating all interrupts and creating mappings upfront is a waste of memory. If the use case here is that all these interrupts will be wired and used in most cases, then upfront allocation is probably not a problem. M.
> I guess this is depends whether the most usual case is to have all > these interrupts being actively in use or not. Most interrupts only > use a limited portion of their interrupt space at any given time. > Allocating all interrupts and creating mappings upfront is a waste of > memory. > > If the use case here is that all these interrupts will be wired and > used in most cases, then upfront allocation is probably not a problem. Hi Marc The interrupts are generally used. Since this is an Ethernet switch, generally the port is administratively up, even if there is no cable plugged in. Once/if a cable is plugged in and there is a link peer, the PHY will interrupt to indicate this. The only real case i can think of when the interrupts are not used is when the switch has more ports than connected to the front panel. This can happen in industrial settings, but not SOHO. Those ports which don't go anywhere are never configured up and so the interrupt is never used. Andrew
On Tue, Apr 13, 2021 at 02:52:59PM +0200, Andrew Lunn wrote: > > I guess this is depends whether the most usual case is to have all > > these interrupts being actively in use or not. Most interrupts only > > use a limited portion of their interrupt space at any given time. > > Allocating all interrupts and creating mappings upfront is a waste of > > memory. > > > > If the use case here is that all these interrupts will be wired and > > used in most cases, then upfront allocation is probably not a problem. > > Hi Marc > > The interrupts are generally used. Since this is an Ethernet switch, > generally the port is administratively up, even if there is no cable > plugged in. Once/if a cable is plugged in and there is a link peer, > the PHY will interrupt to indicate this. > > The only real case i can think of when the interrupts are not used is > when the switch has more ports than connected to the front panel. This > can happen in industrial settings, but not SOHO. Those ports which > don't go anywhere are never configured up and so the interrupt is > never used. Hi Andrew This is what the extra check (BIT(p) & ds->phys_mii_mask) avoids. Currently the mv88e6xxx driver does not have this check, and creates 15 PHY IRQ mappings on my 88E6176 unconditionally, leaving a gap in /proc/interrupts: ... 57: 0 0 mv88e6xxx-g1 3 Edge mv88e6xxx-f1072004.mdio-mii:00-g1-atu-prob 59: 0 0 mv88e6xxx-g1 5 Edge mv88e6xxx-f1072004.mdio-mii:00-g1-vtu-prob 61: 8 5 mv88e6xxx-g1 7 Edge mv88e6xxx-f1072004.mdio-mii:00-g2 63: 8 4 mv88e6xxx-g2 0 Edge mv88e6xxx-1:00 64: 0 0 mv88e6xxx-g2 1 Edge mv88e6xxx-1:01 65: 0 0 mv88e6xxx-g2 2 Edge mv88e6xxx-1:02 66: 0 0 mv88e6xxx-g2 3 Edge mv88e6xxx-1:03 67: 0 2 mv88e6xxx-g2 4 Edge mv88e6xxx-1:04 // IRQ 68~77 are created but not used 78: 0 0 mv88e6xxx-g2 15 Edge mv88e6xxx-f1072004.mdio-mii:00-watchdog ... You may as well add irq_set_nested_thread(irq, true) to irq_domain_map so all IRQs share a single thread. > > Andrew
diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig index a5f1aa911fe2..264384449f09 100644 --- a/drivers/net/dsa/Kconfig +++ b/drivers/net/dsa/Kconfig @@ -36,6 +36,7 @@ config NET_DSA_LANTIQ_GSWIP config NET_DSA_MT7530 tristate "MediaTek MT753x and MT7621 Ethernet switch support" select NET_DSA_TAG_MTK + select MEDIATEK_PHY help This enables support for the MediaTek MT7530, MT7531, and MT7621 Ethernet switch chips. diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index 2bd1bab71497..da033004a74d 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; @@ -822,6 +817,22 @@ mt7531_ind_phy_write(struct dsa_switch *ds, int port, int regnum, 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) @@ -1828,6 +1839,211 @@ mt7530_setup_gpio(struct mt7530_priv *priv) } #endif /* CONFIG_GPIOLIB */ +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 = mdiobus_register(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) { @@ -2780,32 +2996,25 @@ static int mt753x_setup(struct dsa_switch *ds) { struct mt7530_priv *priv = ds->priv; + int ret = priv->info->sw_setup(ds); + if (ret) + return ret; - 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; - - 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 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 +3195,9 @@ mt7530_remove(struct mdio_device *mdiodev) 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); } diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h index ec36ea5dfd57..62fcaabefba1 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 +709,8 @@ static const char *p5_intf_modes(unsigned int p5_interface) } } +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 @@ -726,8 +735,8 @@ 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, @@ -761,6 +770,10 @@ 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; @@ -782,6 +795,9 @@ 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 {
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> --- RFC v3 -> RFC v4: - No changes. drivers/net/dsa/Kconfig | 1 + drivers/net/dsa/mt7530.c | 266 +++++++++++++++++++++++++++++++++++---- drivers/net/dsa/mt7530.h | 20 ++- 3 files changed, 258 insertions(+), 29 deletions(-)