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Date:   Mon, 13 Jul 2020 19:57:09 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, antoine.tenart@...tlin.com,
        alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        alexandru.marginean@....com, claudiu.manoil@....com,
        madalin.bucur@....nxp.com, radu-andrei.bulie@....com,
        fido_max@...ox.ru
Subject: [PATCH v4 net-next 09/11] net: dsa: felix: move probing to felix_vsc9959.c

From: Vladimir Oltean <vladimir.oltean@....com>

Felix is not actually meant to be a DSA driver only for the switch
inside NXP LS1028A, but an umbrella for all Vitesse / Microsemi /
Microchip switches that are register-compatible with Ocelot and that are
using in DSA mode (with an NPI Ethernet port).

For the dsa_switch_ops exported by the felix driver to be generic enough
to be used by other non-PCI switches, we need to move the PCI-specific
probing to the low-level translation module felix_vsc9959.c. This way,
other switches can have their own probing functions, as platform devices
or otherwise.

This patch also removes the "Felix instance table", which did not stand
the test of time and is unnecessary at this point.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
---
Changes in v4:
None.

Changes in v3:
Added comment at the beginning of felix.c.
Added a centralized __init felix_init and __exit felix_exit that deals
with registering the drivers for each individual switch. This is done in
order to avoid build errors when compiled as module.

Changes in v2:
Patch is new.

 drivers/net/dsa/ocelot/felix.c         | 195 +++----------------------
 drivers/net/dsa/ocelot/felix.h         |  15 +-
 drivers/net/dsa/ocelot/felix_vsc9959.c | 187 +++++++++++++++++++++++-
 3 files changed, 206 insertions(+), 191 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index b9981d8c4c98..d90a7e12568e 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -1,5 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright 2019 NXP Semiconductors
+ *
+ * This is an umbrella module for all network switches that are
+ * register-compatible with Ocelot and that perform I/O to their host CPU
+ * through an NPI (Node Processor Interface) Ethernet port.
  */
 #include <uapi/linux/if_bridge.h>
 #include <soc/mscc/ocelot_vcap.h>
@@ -185,37 +189,10 @@ static void felix_phylink_validate(struct dsa_switch *ds, int port,
 				   struct phylink_link_state *state)
 {
 	struct ocelot *ocelot = ds->priv;
-	struct ocelot_port *ocelot_port = ocelot->ports[port];
-	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
-
-	if (state->interface != PHY_INTERFACE_MODE_NA &&
-	    state->interface != ocelot_port->phy_mode) {
-		bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
-		return;
-	}
-
-	phylink_set_port_modes(mask);
-	phylink_set(mask, Autoneg);
-	phylink_set(mask, Pause);
-	phylink_set(mask, Asym_Pause);
-	phylink_set(mask, 10baseT_Half);
-	phylink_set(mask, 10baseT_Full);
-	phylink_set(mask, 100baseT_Half);
-	phylink_set(mask, 100baseT_Full);
-	phylink_set(mask, 1000baseT_Half);
-	phylink_set(mask, 1000baseT_Full);
-
-	if (state->interface == PHY_INTERFACE_MODE_INTERNAL ||
-	    state->interface == PHY_INTERFACE_MODE_2500BASEX ||
-	    state->interface == PHY_INTERFACE_MODE_USXGMII) {
-		phylink_set(mask, 2500baseT_Full);
-		phylink_set(mask, 2500baseX_Full);
-	}
+	struct felix *felix = ocelot_to_felix(ocelot);
 
-	bitmap_and(supported, supported, mask,
-		   __ETHTOOL_LINK_MODE_MASK_NBITS);
-	bitmap_and(state->advertising, state->advertising, mask,
-		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+	if (felix->info->phylink_validate)
+		felix->info->phylink_validate(ocelot, port, supported, state);
 }
 
 static int felix_phylink_mac_pcs_get_state(struct dsa_switch *ds, int port,
@@ -456,7 +433,6 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 {
 	struct ocelot *ocelot = &felix->ocelot;
 	phy_interface_t *port_phy_modes;
-	resource_size_t switch_base;
 	struct resource res;
 	int port, i, err;
 
@@ -487,9 +463,6 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 		return err;
 	}
 
-	switch_base = pci_resource_start(felix->pdev,
-					 felix->info->switch_pci_bar);
-
 	for (i = 0; i < TARGET_MAX; i++) {
 		struct regmap *target;
 
@@ -498,8 +471,8 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 
 		memcpy(&res, &felix->info->target_io_res[i], sizeof(res));
 		res.flags = IORESOURCE_MEM;
-		res.start += switch_base;
-		res.end += switch_base;
+		res.start += felix->switch_base;
+		res.end += felix->switch_base;
 
 		target = ocelot_regmap_init(ocelot, &res);
 		if (IS_ERR(target)) {
@@ -536,8 +509,8 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 
 		memcpy(&res, &felix->info->port_io_res[port], sizeof(res));
 		res.flags = IORESOURCE_MEM;
-		res.start += switch_base;
-		res.end += switch_base;
+		res.start += felix->switch_base;
+		res.end += felix->switch_base;
 
 		target = ocelot_regmap_init(ocelot, &res);
 		if (IS_ERR(target)) {
@@ -802,7 +775,7 @@ static int felix_port_setup_tc(struct dsa_switch *ds, int port,
 		return -EOPNOTSUPP;
 }
 
-static const struct dsa_switch_ops felix_switch_ops = {
+const struct dsa_switch_ops felix_switch_ops = {
 	.get_tag_protocol	= felix_get_tag_protocol,
 	.setup			= felix_setup,
 	.teardown		= felix_teardown,
@@ -845,149 +818,17 @@ static const struct dsa_switch_ops felix_switch_ops = {
 	.port_setup_tc          = felix_port_setup_tc,
 };
 
-static struct felix_info *felix_instance_tbl[] = {
-	[FELIX_INSTANCE_VSC9959] = &felix_info_vsc9959,
-};
-
-static irqreturn_t felix_irq_handler(int irq, void *data)
-{
-	struct ocelot *ocelot = (struct ocelot *)data;
-
-	/* The INTB interrupt is used for both PTP TX timestamp interrupt
-	 * and preemption status change interrupt on each port.
-	 *
-	 * - Get txtstamp if have
-	 * - TODO: handle preemption. Without handling it, driver may get
-	 *   interrupt storm.
-	 */
-
-	ocelot_get_txtstamp(ocelot);
-
-	return IRQ_HANDLED;
-}
-
-static int felix_pci_probe(struct pci_dev *pdev,
-			   const struct pci_device_id *id)
+static int __init felix_init(void)
 {
-	enum felix_instance instance = id->driver_data;
-	struct dsa_switch *ds;
-	struct ocelot *ocelot;
-	struct felix *felix;
-	int err;
-
-	if (pdev->dev.of_node && !of_device_is_available(pdev->dev.of_node)) {
-		dev_info(&pdev->dev, "device is disabled, skipping\n");
-		return -ENODEV;
-	}
-
-	err = pci_enable_device(pdev);
-	if (err) {
-		dev_err(&pdev->dev, "device enable failed\n");
-		goto err_pci_enable;
-	}
-
-	/* set up for high or low dma */
-	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
-	if (err) {
-		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (err) {
-			dev_err(&pdev->dev,
-				"DMA configuration failed: 0x%x\n", err);
-			goto err_dma;
-		}
-	}
-
-	felix = kzalloc(sizeof(struct felix), GFP_KERNEL);
-	if (!felix) {
-		err = -ENOMEM;
-		dev_err(&pdev->dev, "Failed to allocate driver memory\n");
-		goto err_alloc_felix;
-	}
-
-	pci_set_drvdata(pdev, felix);
-	ocelot = &felix->ocelot;
-	ocelot->dev = &pdev->dev;
-	felix->pdev = pdev;
-	felix->info = felix_instance_tbl[instance];
-
-	pci_set_master(pdev);
-
-	err = devm_request_threaded_irq(&pdev->dev, pdev->irq, NULL,
-					&felix_irq_handler, IRQF_ONESHOT,
-					"felix-intb", ocelot);
-	if (err) {
-		dev_err(&pdev->dev, "Failed to request irq\n");
-		goto err_alloc_irq;
-	}
-
-	ocelot->ptp = 1;
-
-	ds = kzalloc(sizeof(struct dsa_switch), GFP_KERNEL);
-	if (!ds) {
-		err = -ENOMEM;
-		dev_err(&pdev->dev, "Failed to allocate DSA switch\n");
-		goto err_alloc_ds;
-	}
-
-	ds->dev = &pdev->dev;
-	ds->num_ports = felix->info->num_ports;
-	ds->num_tx_queues = felix->info->num_tx_queues;
-	ds->ops = &felix_switch_ops;
-	ds->priv = ocelot;
-	felix->ds = ds;
-
-	err = dsa_register_switch(ds);
-	if (err) {
-		dev_err(&pdev->dev, "Failed to register DSA switch: %d\n", err);
-		goto err_register_ds;
-	}
-
-	return 0;
-
-err_register_ds:
-	kfree(ds);
-err_alloc_ds:
-err_alloc_irq:
-err_alloc_felix:
-	kfree(felix);
-err_dma:
-	pci_disable_device(pdev);
-err_pci_enable:
-	return err;
+	return pci_register_driver(&felix_vsc9959_pci_driver);
 }
+module_init(felix_init);
 
-static void felix_pci_remove(struct pci_dev *pdev)
+static void __exit felix_exit(void)
 {
-	struct felix *felix;
-
-	felix = pci_get_drvdata(pdev);
-
-	dsa_unregister_switch(felix->ds);
-
-	kfree(felix->ds);
-	kfree(felix);
-
-	pci_disable_device(pdev);
+	pci_unregister_driver(&felix_vsc9959_pci_driver);
 }
-
-static struct pci_device_id felix_ids[] = {
-	{
-		/* NXP LS1028A */
-		PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, 0xEEF0),
-		.driver_data = FELIX_INSTANCE_VSC9959,
-	},
-	{ 0, }
-};
-MODULE_DEVICE_TABLE(pci, felix_ids);
-
-static struct pci_driver felix_pci_driver = {
-	.name		= KBUILD_MODNAME,
-	.id_table	= felix_ids,
-	.probe		= felix_pci_probe,
-	.remove		= felix_pci_remove,
-};
-
-module_pci_driver(felix_pci_driver);
+module_exit(felix_exit);
 
 MODULE_DESCRIPTION("Felix Switch driver");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index a85631d716b9..b858b7f79090 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -37,6 +37,9 @@ struct felix_info {
 			       int speed, int duplex);
 	void	(*pcs_link_state)(struct ocelot *ocelot, int port,
 				  struct phylink_link_state *state);
+	void	(*phylink_validate)(struct ocelot *ocelot, int port,
+				    unsigned long *supported,
+				    struct phylink_link_state *state);
 	int	(*prevalidate_phy_mode)(struct ocelot *ocelot, int port,
 					phy_interface_t phy_mode);
 	int	(*port_setup_tc)(struct dsa_switch *ds, int port,
@@ -46,20 +49,18 @@ struct felix_info {
 	void	(*xmit_template_populate)(struct ocelot *ocelot, int port);
 };
 
-extern struct felix_info		felix_info_vsc9959;
-
-enum felix_instance {
-	FELIX_INSTANCE_VSC9959		= 0,
-};
+extern const struct dsa_switch_ops felix_switch_ops;
+extern struct pci_driver felix_vsc9959_pci_driver;
 
 /* DSA glue / front-end for struct ocelot */
 struct felix {
 	struct dsa_switch		*ds;
-	struct pci_dev			*pdev;
-	struct felix_info		*info;
+	const struct felix_info		*info;
 	struct ocelot			ocelot;
 	struct mii_bus			*imdio;
 	struct phy_device		**pcs;
+	resource_size_t			switch_base;
+	resource_size_t			imdio_base;
 };
 
 #endif
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 7e8a99455670..cdfc806d5179 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1128,6 +1128,43 @@ static void vsc9959_pcs_link_state(struct ocelot *ocelot, int port,
 	vsc9959_pcs_link_state_resolve(pcs, state);
 }
 
+static void vsc9959_phylink_validate(struct ocelot *ocelot, int port,
+				     unsigned long *supported,
+				     struct phylink_link_state *state)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+
+	if (state->interface != PHY_INTERFACE_MODE_NA &&
+	    state->interface != ocelot_port->phy_mode) {
+		bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+		return;
+	}
+
+	phylink_set_port_modes(mask);
+	phylink_set(mask, Autoneg);
+	phylink_set(mask, Pause);
+	phylink_set(mask, Asym_Pause);
+	phylink_set(mask, 10baseT_Half);
+	phylink_set(mask, 10baseT_Full);
+	phylink_set(mask, 100baseT_Half);
+	phylink_set(mask, 100baseT_Full);
+	phylink_set(mask, 1000baseT_Half);
+	phylink_set(mask, 1000baseT_Full);
+
+	if (state->interface == PHY_INTERFACE_MODE_INTERNAL ||
+	    state->interface == PHY_INTERFACE_MODE_2500BASEX ||
+	    state->interface == PHY_INTERFACE_MODE_USXGMII) {
+		phylink_set(mask, 2500baseT_Full);
+		phylink_set(mask, 2500baseX_Full);
+	}
+
+	bitmap_and(supported, supported, mask,
+		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+	bitmap_and(state->advertising, state->advertising, mask,
+		   __ETHTOOL_LINK_MODE_MASK_NBITS);
+}
+
 static int vsc9959_prevalidate_phy_mode(struct ocelot *ocelot, int port,
 					phy_interface_t phy_mode)
 {
@@ -1171,7 +1208,6 @@ static int vsc9959_mdio_bus_alloc(struct ocelot *ocelot)
 	struct felix *felix = ocelot_to_felix(ocelot);
 	struct enetc_mdio_priv *mdio_priv;
 	struct device *dev = ocelot->dev;
-	resource_size_t imdio_base;
 	void __iomem *imdio_regs;
 	struct resource res;
 	struct enetc_hw *hw;
@@ -1187,13 +1223,10 @@ static int vsc9959_mdio_bus_alloc(struct ocelot *ocelot)
 		return -ENOMEM;
 	}
 
-	imdio_base = pci_resource_start(felix->pdev,
-					felix->info->imdio_pci_bar);
-
 	memcpy(&res, felix->info->imdio_res, sizeof(res));
 	res.flags = IORESOURCE_MEM;
-	res.start += imdio_base;
-	res.end += imdio_base;
+	res.start += felix->imdio_base;
+	res.end += felix->imdio_base;
 
 	imdio_regs = devm_ioremap_resource(dev, &res);
 	if (IS_ERR(imdio_regs)) {
@@ -1467,7 +1500,7 @@ static void vsc9959_xmit_template_populate(struct ocelot *ocelot, int port)
 	packing(template, &src,     46,  43, OCELOT_TAG_LEN, PACK, 0);
 }
 
-struct felix_info felix_info_vsc9959 = {
+static const struct felix_info felix_info_vsc9959 = {
 	.target_io_res		= vsc9959_target_io_res,
 	.port_io_res		= vsc9959_port_io_res,
 	.imdio_res		= &vsc9959_imdio_res,
@@ -1490,8 +1523,148 @@ struct felix_info felix_info_vsc9959 = {
 	.pcs_config		= vsc9959_pcs_config,
 	.pcs_link_up		= vsc9959_pcs_link_up,
 	.pcs_link_state		= vsc9959_pcs_link_state,
+	.phylink_validate	= vsc9959_phylink_validate,
 	.prevalidate_phy_mode	= vsc9959_prevalidate_phy_mode,
 	.port_setup_tc          = vsc9959_port_setup_tc,
 	.port_sched_speed_set   = vsc9959_sched_speed_set,
 	.xmit_template_populate	= vsc9959_xmit_template_populate,
 };
+
+static irqreturn_t felix_irq_handler(int irq, void *data)
+{
+	struct ocelot *ocelot = (struct ocelot *)data;
+
+	/* The INTB interrupt is used for both PTP TX timestamp interrupt
+	 * and preemption status change interrupt on each port.
+	 *
+	 * - Get txtstamp if have
+	 * - TODO: handle preemption. Without handling it, driver may get
+	 *   interrupt storm.
+	 */
+
+	ocelot_get_txtstamp(ocelot);
+
+	return IRQ_HANDLED;
+}
+
+static int felix_pci_probe(struct pci_dev *pdev,
+			   const struct pci_device_id *id)
+{
+	struct dsa_switch *ds;
+	struct ocelot *ocelot;
+	struct felix *felix;
+	int err;
+
+	if (pdev->dev.of_node && !of_device_is_available(pdev->dev.of_node)) {
+		dev_info(&pdev->dev, "device is disabled, skipping\n");
+		return -ENODEV;
+	}
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "device enable failed\n");
+		goto err_pci_enable;
+	}
+
+	/* set up for high or low dma */
+	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (err) {
+		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+		if (err) {
+			dev_err(&pdev->dev,
+				"DMA configuration failed: 0x%x\n", err);
+			goto err_dma;
+		}
+	}
+
+	felix = kzalloc(sizeof(struct felix), GFP_KERNEL);
+	if (!felix) {
+		err = -ENOMEM;
+		dev_err(&pdev->dev, "Failed to allocate driver memory\n");
+		goto err_alloc_felix;
+	}
+
+	pci_set_drvdata(pdev, felix);
+	ocelot = &felix->ocelot;
+	ocelot->dev = &pdev->dev;
+	felix->info = &felix_info_vsc9959;
+	felix->switch_base = pci_resource_start(pdev,
+						felix->info->switch_pci_bar);
+	felix->imdio_base = pci_resource_start(pdev,
+					       felix->info->imdio_pci_bar);
+
+	pci_set_master(pdev);
+
+	err = devm_request_threaded_irq(&pdev->dev, pdev->irq, NULL,
+					&felix_irq_handler, IRQF_ONESHOT,
+					"felix-intb", ocelot);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to request irq\n");
+		goto err_alloc_irq;
+	}
+
+	ocelot->ptp = 1;
+
+	ds = kzalloc(sizeof(struct dsa_switch), GFP_KERNEL);
+	if (!ds) {
+		err = -ENOMEM;
+		dev_err(&pdev->dev, "Failed to allocate DSA switch\n");
+		goto err_alloc_ds;
+	}
+
+	ds->dev = &pdev->dev;
+	ds->num_ports = felix->info->num_ports;
+	ds->num_tx_queues = felix->info->num_tx_queues;
+	ds->ops = &felix_switch_ops;
+	ds->priv = ocelot;
+	felix->ds = ds;
+
+	err = dsa_register_switch(ds);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to register DSA switch: %d\n", err);
+		goto err_register_ds;
+	}
+
+	return 0;
+
+err_register_ds:
+	kfree(ds);
+err_alloc_ds:
+err_alloc_irq:
+err_alloc_felix:
+	kfree(felix);
+err_dma:
+	pci_disable_device(pdev);
+err_pci_enable:
+	return err;
+}
+
+static void felix_pci_remove(struct pci_dev *pdev)
+{
+	struct felix *felix;
+
+	felix = pci_get_drvdata(pdev);
+
+	dsa_unregister_switch(felix->ds);
+
+	kfree(felix->ds);
+	kfree(felix);
+
+	pci_disable_device(pdev);
+}
+
+static struct pci_device_id felix_ids[] = {
+	{
+		/* NXP LS1028A */
+		PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, 0xEEF0),
+	},
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, felix_ids);
+
+struct pci_driver felix_vsc9959_pci_driver = {
+	.name		= "mscc_felix",
+	.id_table	= felix_ids,
+	.probe		= felix_pci_probe,
+	.remove		= felix_pci_remove,
+};
-- 
2.25.1

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