net: dsa: microchip: bypass dev_ops->setup() and teardown() for lan937x

The KSZ switch families are sufficiently different that a common
ds->ops->setup() - ksz_setup() with micro-managed dev_ops->reset(),
dev_ops->pcs_create(), dev_ops->config_cpu_port(),
dev_ops->enable_stp_addr(), dev_ops->setup() seems to be too convoluted.

I am proposing to make each KSZ switch family part ways for
dsa_switch_ops :: setup() and teardown(), to allow them greater
flexibility. This here is the implementation for lan937x, which is
nothing other than a copy of ksz_setup() with the dev_ops function
pointers replaced with direct function calls.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20260521-clean-ksz-2nd-series-v3-2-75c38971c19a@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/microchip/ksz_common.c

@@ -2488,7 +2488,7 @@ static int ksz_parse_dt_phy_config(struct ksz_device *dev, struct mii_bus *bus,
  *
  * Return: 0 on success, or a negative error code on failure.
  */
-static int ksz_mdio_register(struct ksz_device *dev)
+int ksz_mdio_register(struct ksz_device *dev)
 {
 	struct device_node *parent_bus_node;
 	struct mii_bus *parent_bus = NULL;
@@ -2644,7 +2644,7 @@ static const struct irq_domain_ops ksz_irq_domain_ops = {
 	.xlate	= irq_domain_xlate_twocell,
 };
 
-static void ksz_irq_free(struct ksz_irq *kirq)
+void ksz_irq_free(struct ksz_irq *kirq)
 {
 	int irq, virq;
 
@@ -2713,7 +2713,7 @@ static int ksz_irq_common_setup(struct ksz_device *dev, struct ksz_irq *kirq)
 	return ret;
 }
 
-static int ksz_girq_setup(struct ksz_device *dev)
+int ksz_girq_setup(struct ksz_device *dev)
 {
 	struct ksz_irq *girq = &dev->girq;
 
@@ -2728,7 +2728,7 @@ static int ksz_girq_setup(struct ksz_device *dev)
 	return ksz_irq_common_setup(dev, girq);
 }
 
-static int ksz_pirq_setup(struct ksz_device *dev, u8 p)
+int ksz_pirq_setup(struct ksz_device *dev, u8 p)
 {
 	struct ksz_irq *pirq = &dev->ports[p].pirq;
 
@@ -2745,8 +2745,6 @@ static int ksz_pirq_setup(struct ksz_device *dev, u8 p)
 	return ksz_irq_common_setup(dev, pirq);
 }
 
-static int ksz_parse_drive_strength(struct ksz_device *dev);
-
 int ksz_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;
@@ -4694,7 +4692,7 @@ static int ksz88x3_drive_strength_write(struct ksz_device *dev,
  *
  * Return: 0 on success, error code otherwise
  */
-static int ksz_parse_drive_strength(struct ksz_device *dev)
+int ksz_parse_drive_strength(struct ksz_device *dev)
 {
 	struct ksz_driver_strength_prop of_props[] = {
 		[KSZ_DRIVER_STRENGTH_HI] = {

drivers/net/dsa/microchip/ksz_common.h

@@ -518,6 +518,12 @@ int ksz_hsr_leave(struct dsa_switch *ds, int port,
 int ksz_suspend(struct dsa_switch *ds);
 int ksz_resume(struct dsa_switch *ds);
 
+int ksz_mdio_register(struct ksz_device *dev);
+int ksz_pirq_setup(struct ksz_device *dev, u8 p);
+int ksz_girq_setup(struct ksz_device *dev);
+void ksz_irq_free(struct ksz_irq *kirq);
+int ksz_parse_drive_strength(struct ksz_device *dev);
+
 /* Common register access functions */
 static inline struct regmap *ksz_regmap_8(struct ksz_device *dev)
 {

drivers/net/dsa/microchip/lan937x_main.c

@@ -626,8 +626,49 @@ static int lan937x_switch_init(struct ksz_device *dev)
 static int lan937x_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;
+	u16 storm_mask, storm_rate;
+	struct dsa_port *dp;
+	struct ksz_port *p;
+	const u16 *regs;
 	int ret;
 
+	regs = dev->info->regs;
+
+	dev->vlan_cache = devm_kcalloc(dev->dev, sizeof(struct vlan_table),
+				       dev->info->num_vlans, GFP_KERNEL);
+	if (!dev->vlan_cache)
+		return -ENOMEM;
+
+	ret = lan937x_reset_switch(dev);
+	if (ret) {
+		dev_err(ds->dev, "failed to reset switch\n");
+		return ret;
+	}
+
+	ret = ksz_parse_drive_strength(dev);
+	if (ret)
+		return ret;
+
+	/* set broadcast storm protection 10% rate */
+	storm_mask = BROADCAST_STORM_RATE;
+	storm_rate = (BROADCAST_STORM_VALUE * BROADCAST_STORM_PROT_RATE) / 100;
+	regmap_update_bits(ksz_regmap_16(dev), regs[S_BROADCAST_CTRL],
+			   storm_mask, storm_rate);
+
+	lan937x_config_cpu_port(ds);
+
+	ksz9477_enable_stp_addr(dev);
+
+	ds->num_tx_queues = dev->info->num_tx_queues;
+
+	regmap_update_bits(ksz_regmap_8(dev), regs[S_MULTICAST_CTRL],
+			   MULTICAST_STORM_DISABLE, MULTICAST_STORM_DISABLE);
+
+	ksz_init_mib_timer(dev);
+
+	ds->configure_vlan_while_not_filtering = false;
+	ds->dscp_prio_mapping_is_global = true;
+
 	/* The VLAN aware is a global setting. Mixed vlan
 	 * filterings are not supported.
 	 */
@@ -659,13 +700,71 @@ static int lan937x_setup(struct dsa_switch *ds)
 		return ret;
 
 	/* Disable global VPHY support. Related to CPU interface only? */
-	return ksz_rmw32(dev, REG_SW_CFG_STRAP_OVR, SW_VPHY_DISABLE,
-			 SW_VPHY_DISABLE);
-}
+	ret = ksz_rmw32(dev, REG_SW_CFG_STRAP_OVR, SW_VPHY_DISABLE,
+			SW_VPHY_DISABLE);
+	if (ret < 0)
+		return ret;
 
-static void lan937x_teardown(struct dsa_switch *ds)
-{
+	/* Start with learning disabled on standalone user ports, and enabled
+	 * on the CPU port. In lack of other finer mechanisms, learning on the
+	 * CPU port will avoid flooding bridge local addresses on the network
+	 * in some cases.
+	 */
+	p = &dev->ports[dev->cpu_port];
+	p->learning = true;
 
+	if (dev->irq > 0) {
+		ret = ksz_girq_setup(dev);
+		if (ret)
+			return ret;
+
+		dsa_switch_for_each_user_port(dp, dev->ds) {
+			ret = ksz_pirq_setup(dev, dp->index);
+			if (ret)
+				goto port_release;
+
+			ret = ksz_ptp_irq_setup(ds, dp->index);
+			if (ret)
+				goto pirq_release;
+		}
+	}
+
+	ret = ksz_ptp_clock_register(ds);
+	if (ret) {
+		dev_err(dev->dev, "Failed to register PTP clock: %d\n",
+			ret);
+		goto port_release;
+	}
+
+	ret = ksz_mdio_register(dev);
+	if (ret < 0) {
+		dev_err(dev->dev, "failed to register the mdio");
+		goto out_ptp_clock_unregister;
+	}
+
+	ret = ksz_dcb_init(dev);
+	if (ret)
+		goto out_ptp_clock_unregister;
+
+	/* start switch */
+	regmap_update_bits(ksz_regmap_8(dev), regs[S_START_CTRL],
+			   SW_START, SW_START);
+
+	return 0;
+
+out_ptp_clock_unregister:
+	ksz_ptp_clock_unregister(ds);
+port_release:
+	if (dev->irq > 0) {
+		dsa_switch_for_each_user_port_continue_reverse(dp, dev->ds) {
+			ksz_ptp_irq_free(ds, dp->index);
+pirq_release:
+			ksz_irq_free(&dev->ports[dp->index].pirq);
+		}
+		ksz_irq_free(&dev->girq);
+	}
+
+	return ret;
 }
 
 static enum dsa_tag_protocol lan937x_get_tag_protocol(struct dsa_switch *ds,
@@ -698,8 +797,6 @@ const struct phylink_mac_ops lan937x_phylink_mac_ops = {
 };
 
 const struct ksz_dev_ops lan937x_dev_ops = {
-	.setup = lan937x_setup,
-	.teardown = lan937x_teardown,
 	.get_port_addr = ksz9477_get_port_addr,
 	.cfg_port_member = ksz9477_cfg_port_member,
 	.port_setup = lan937x_port_setup,
@@ -713,10 +810,7 @@ const struct ksz_dev_ops lan937x_dev_ops = {
 	.freeze_mib = ksz9477_freeze_mib,
 	.port_init_cnt = ksz9477_port_init_cnt,
 	.setup_rgmii_delay = lan937x_setup_rgmii_delay,
-	.config_cpu_port = lan937x_config_cpu_port,
 	.tc_cbs_set_cinc = lan937x_tc_cbs_set_cinc,
-	.enable_stp_addr = ksz9477_enable_stp_addr,
-	.reset = lan937x_reset_switch,
 	.init = lan937x_switch_init,
 };
 
@@ -724,7 +818,7 @@ const struct dsa_switch_ops lan937x_switch_ops = {
 	.get_tag_protocol	= lan937x_get_tag_protocol,
 	.connect_tag_protocol   = lan937x_connect_tag_protocol,
 	.get_phy_flags		= ksz_get_phy_flags,
-	.setup			= ksz_setup,
+	.setup			= lan937x_setup,
 	.teardown		= ksz_teardown,
 	.phy_read		= ksz_phy_read16,
 	.phy_write		= ksz_phy_write16,