drivers/net/dsa/mv88e6060.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
  * Copyright (c) 2008-2009 Marvell Semiconductor
  */

 #include <linux/delay.h>
 #include <linux/etherdevice.h>
 #include <linux/jiffies.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/phy.h>
 #include <net/dsa.h>
 #include "mv88e6060.h"

 static int reg_read(struct mv88e6060_priv *priv, int addr, int reg)
 {
 	return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg);
 }

 static int reg_write(struct mv88e6060_priv *priv, int addr, int reg, u16 val)
 {
 	return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
 }

 static const char *mv88e6060_get_name(struct mii_bus *bus, int sw_addr)
 {
 	int ret;

 	ret = mdiobus_read(bus, sw_addr + REG_PORT(0), PORT_SWITCH_ID);
 	if (ret >= 0) {
 		if (ret == PORT_SWITCH_ID_6060)
 			return "Marvell 88E6060 (A0)";
 		if (ret == PORT_SWITCH_ID_6060_R1 ||
 		    ret == PORT_SWITCH_ID_6060_R2)
 			return "Marvell 88E6060 (B0)";
 		if ((ret & PORT_SWITCH_ID_6060_MASK) == PORT_SWITCH_ID_6060)
 			return "Marvell 88E6060";
 	}

 	return NULL;
 }

 static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds,
 							int port)
 {
 	return DSA_TAG_PROTO_TRAILER;
 }

 static int mv88e6060_switch_reset(struct mv88e6060_priv *priv)
 {
 	int i;
 	int ret;
 	unsigned long timeout;

 	/* Set all ports to the disabled state. */
 	for (i = 0; i < MV88E6060_PORTS; i++) {
 		ret = reg_read(priv, REG_PORT(i), PORT_CONTROL);
 		if (ret < 0)
 			return ret;
 		ret = reg_write(priv, REG_PORT(i), PORT_CONTROL,
 				ret & ~PORT_CONTROL_STATE_MASK);
 		if (ret)
 			return ret;
 	}

 	/* Wait for transmit queues to drain. */
 	usleep_range(2000, 4000);

 	/* Reset the switch. */
 	ret = reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL,
 			GLOBAL_ATU_CONTROL_SWRESET |
 			GLOBAL_ATU_CONTROL_LEARNDIS);
 	if (ret)
 		return ret;

 	/* Wait up to one second for reset to complete. */
 	timeout = jiffies + 1 * HZ;
 	while (time_before(jiffies, timeout)) {
 		ret = reg_read(priv, REG_GLOBAL, GLOBAL_STATUS);
 		if (ret < 0)
 			return ret;

 		if (ret & GLOBAL_STATUS_INIT_READY)
 			break;

 		usleep_range(1000, 2000);
 	}
 	if (time_after(jiffies, timeout))
 		return -ETIMEDOUT;

 	return 0;
 }

 static int mv88e6060_setup_global(struct mv88e6060_priv *priv)
 {
 	int ret;

 	/* Disable discarding of frames with excessive collisions,
 	 * set the maximum frame size to 1536 bytes, and mask all
 	 * interrupt sources.
 	 */
 	ret = reg_write(priv, REG_GLOBAL, GLOBAL_CONTROL,
 			GLOBAL_CONTROL_MAX_FRAME_1536);
 	if (ret)
 		return ret;

 	/* Disable automatic address learning.
 	 */
 	return reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL,
 			 GLOBAL_ATU_CONTROL_LEARNDIS);
 }

 static int mv88e6060_setup_port(struct mv88e6060_priv *priv, int p)
 {
 	int addr = REG_PORT(p);
 	int ret;

 	/* Do not force flow control, disable Ingress and Egress
 	 * Header tagging, disable VLAN tunneling, and set the port
 	 * state to Forwarding.  Additionally, if this is the CPU
 	 * port, enable Ingress and Egress Trailer tagging mode.
 	 */
 	ret = reg_write(priv, addr, PORT_CONTROL,
 			dsa_is_cpu_port(priv->ds, p) ?
 			PORT_CONTROL_TRAILER |
 			PORT_CONTROL_INGRESS_MODE |
 			PORT_CONTROL_STATE_FORWARDING :
 			PORT_CONTROL_STATE_FORWARDING);
 	if (ret)
 		return ret;

 	/* Port based VLAN map: give each port its own address
 	 * database, allow the CPU port to talk to each of the 'real'
 	 * ports, and allow each of the 'real' ports to only talk to
 	 * the CPU port.
 	 */
 	ret = reg_write(priv, addr, PORT_VLAN_MAP,
 			((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) |
 			(dsa_is_cpu_port(priv->ds, p) ?
 			 dsa_user_ports(priv->ds) :
 			 BIT(dsa_to_port(priv->ds, p)->cpu_dp->index)));
 	if (ret)
 		return ret;

 	/* Port Association Vector: when learning source addresses
 	 * of packets, add the address to the address database using
 	 * a port bitmap that has only the bit for this port set and
 	 * the other bits clear.
 	 */
 	return reg_write(priv, addr, PORT_ASSOC_VECTOR, BIT(p));
 }

 static int mv88e6060_setup_addr(struct mv88e6060_priv *priv)
 {
 	u8 addr[ETH_ALEN];
 	int ret;
 	u16 val;

 	eth_random_addr(addr);

 	val = addr[0] << 8 | addr[1];

 	/* The multicast bit is always transmitted as a zero, so the switch uses
 	 * bit 8 for "DiffAddr", where 0 means all ports transmit the same SA.
 	 */
 	val &= 0xfeff;

 	ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_01, val);
 	if (ret)
 		return ret;

 	ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_23,
 			(addr[2] << 8) | addr[3]);
 	if (ret)
 		return ret;

 	return reg_write(priv, REG_GLOBAL, GLOBAL_MAC_45,
 			 (addr[4] << 8) | addr[5]);
 }

 static int mv88e6060_setup(struct dsa_switch *ds)
 {
 	struct mv88e6060_priv *priv = ds->priv;
 	int ret;
 	int i;

 	priv->ds = ds;

 	ret = mv88e6060_switch_reset(priv);
 	if (ret < 0)
 		return ret;

 	/* @@@ initialise atu */

 	ret = mv88e6060_setup_global(priv);
 	if (ret < 0)
 		return ret;

 	ret = mv88e6060_setup_addr(priv);
 	if (ret < 0)
 		return ret;

 	for (i = 0; i < MV88E6060_PORTS; i++) {
 		ret = mv88e6060_setup_port(priv, i);
 		if (ret < 0)
 			return ret;
 	}

 	return 0;
 }

 static int mv88e6060_port_to_phy_addr(int port)
 {
 	if (port >= 0 && port < MV88E6060_PORTS)
 		return port;
 	return -1;
 }

 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
 {
 	struct mv88e6060_priv *priv = ds->priv;
 	int addr;

 	addr = mv88e6060_port_to_phy_addr(port);
 	if (addr == -1)
 		return 0xffff;

 	return reg_read(priv, addr, regnum);
 }

 static int
 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 {
 	struct mv88e6060_priv *priv = ds->priv;
 	int addr;

 	addr = mv88e6060_port_to_phy_addr(port);
 	if (addr == -1)
 		return 0xffff;

 	return reg_write(priv, addr, regnum, val);
 }

 static const struct dsa_switch_ops mv88e6060_switch_ops = {
 	.get_tag_protocol = mv88e6060_get_tag_protocol,
 	.setup		= mv88e6060_setup,
 	.phy_read	= mv88e6060_phy_read,
 	.phy_write	= mv88e6060_phy_write,
 };

 static int mv88e6060_probe(struct mdio_device *mdiodev)
 {
 	struct device *dev = &mdiodev->dev;
 	struct mv88e6060_priv *priv;
 	struct dsa_switch *ds;
 	const char *name;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->bus = mdiodev->bus;
 	priv->sw_addr = mdiodev->addr;

 	name = mv88e6060_get_name(priv->bus, priv->sw_addr);
 	if (!name)
 		return -ENODEV;

 	dev_info(dev, "switch %s detected\n", name);

 	ds = dsa_switch_alloc(dev, MV88E6060_PORTS);
 	if (!ds)
 		return -ENOMEM;

 	ds->priv = priv;
 	ds->dev = dev;
 	ds->ops = &mv88e6060_switch_ops;

 	dev_set_drvdata(dev, ds);

 	return dsa_register_switch(ds);
 }

 static void mv88e6060_remove(struct mdio_device *mdiodev)
 {
 	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);

 	dsa_unregister_switch(ds);
 }

 static const struct of_device_id mv88e6060_of_match[] = {
 	{
 		.compatible = "marvell,mv88e6060",
 	},
 	{ /* sentinel */ },
 };

 static struct mdio_driver mv88e6060_driver = {
 	.probe	= mv88e6060_probe,
 	.remove = mv88e6060_remove,
 	.mdiodrv.driver = {
 		.name = "mv88e6060",
 		.of_match_table = mv88e6060_of_match,
 	},
 };

 mdio_module_driver(mv88e6060_driver);

 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:mv88e6060");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
	* Copyright (c) 2008-2009 Marvell Semiconductor
	*/

	#include <linux/delay.h>
	#include <linux/etherdevice.h>
	#include <linux/jiffies.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/phy.h>
	#include <net/dsa.h>
	#include "mv88e6060.h"

	static int reg_read(struct mv88e6060_priv *priv, int addr, int reg)
	{
	return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg);
	}

	static int reg_write(struct mv88e6060_priv *priv, int addr, int reg, u16 val)
	{
	return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
	}

	static const char mv88e6060_get_name(struct mii_bus bus, int sw_addr)
	{
	int ret;

	ret = mdiobus_read(bus, sw_addr + REG_PORT(0), PORT_SWITCH_ID);
	if (ret >= 0) {
	if (ret == PORT_SWITCH_ID_6060)
	return "Marvell 88E6060 (A0)";
	if (ret == PORT_SWITCH_ID_6060_R1 \|\|
	ret == PORT_SWITCH_ID_6060_R2)
	return "Marvell 88E6060 (B0)";
	if ((ret & PORT_SWITCH_ID_6060_MASK) == PORT_SWITCH_ID_6060)
	return "Marvell 88E6060";
	}

	return NULL;
	}

	static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds,
	int port)
	{
	return DSA_TAG_PROTO_TRAILER;
	}

	static int mv88e6060_switch_reset(struct mv88e6060_priv *priv)
	{
	int i;
	int ret;
	unsigned long timeout;

	/* Set all ports to the disabled state. */
	for (i = 0; i < MV88E6060_PORTS; i++) {
	ret = reg_read(priv, REG_PORT(i), PORT_CONTROL);
	if (ret < 0)
	return ret;
	ret = reg_write(priv, REG_PORT(i), PORT_CONTROL,
	ret & ~PORT_CONTROL_STATE_MASK);
	if (ret)
	return ret;
	}

	/* Wait for transmit queues to drain. */
	usleep_range(2000, 4000);

	/* Reset the switch. */
	ret = reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL,
	GLOBAL_ATU_CONTROL_SWRESET \|
	GLOBAL_ATU_CONTROL_LEARNDIS);
	if (ret)
	return ret;

	/* Wait up to one second for reset to complete. */
	timeout = jiffies + 1 * HZ;
	while (time_before(jiffies, timeout)) {
	ret = reg_read(priv, REG_GLOBAL, GLOBAL_STATUS);
	if (ret < 0)
	return ret;

	if (ret & GLOBAL_STATUS_INIT_READY)
	break;

	usleep_range(1000, 2000);
	}
	if (time_after(jiffies, timeout))
	return -ETIMEDOUT;

	return 0;
	}

	static int mv88e6060_setup_global(struct mv88e6060_priv *priv)
	{
	int ret;

	/* Disable discarding of frames with excessive collisions,
	* set the maximum frame size to 1536 bytes, and mask all
	* interrupt sources.
	*/
	ret = reg_write(priv, REG_GLOBAL, GLOBAL_CONTROL,
	GLOBAL_CONTROL_MAX_FRAME_1536);
	if (ret)
	return ret;

	/* Disable automatic address learning.
	*/
	return reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL,
	GLOBAL_ATU_CONTROL_LEARNDIS);
	}

	static int mv88e6060_setup_port(struct mv88e6060_priv *priv, int p)
	{
	int addr = REG_PORT(p);
	int ret;

	/* Do not force flow control, disable Ingress and Egress
	* Header tagging, disable VLAN tunneling, and set the port
	* state to Forwarding. Additionally, if this is the CPU
	* port, enable Ingress and Egress Trailer tagging mode.
	*/
	ret = reg_write(priv, addr, PORT_CONTROL,
	dsa_is_cpu_port(priv->ds, p) ?
	PORT_CONTROL_TRAILER \|
	PORT_CONTROL_INGRESS_MODE \|
	PORT_CONTROL_STATE_FORWARDING :
	PORT_CONTROL_STATE_FORWARDING);
	if (ret)
	return ret;

	/* Port based VLAN map: give each port its own address
	* database, allow the CPU port to talk to each of the 'real'
	* ports, and allow each of the 'real' ports to only talk to
	* the CPU port.
	*/
	ret = reg_write(priv, addr, PORT_VLAN_MAP,
	((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) \|
	(dsa_is_cpu_port(priv->ds, p) ?
	dsa_user_ports(priv->ds) :
	BIT(dsa_to_port(priv->ds, p)->cpu_dp->index)));
	if (ret)
	return ret;

	/* Port Association Vector: when learning source addresses
	* of packets, add the address to the address database using
	* a port bitmap that has only the bit for this port set and
	* the other bits clear.
	*/
	return reg_write(priv, addr, PORT_ASSOC_VECTOR, BIT(p));
	}

	static int mv88e6060_setup_addr(struct mv88e6060_priv *priv)
	{
	u8 addr[ETH_ALEN];
	int ret;
	u16 val;

	eth_random_addr(addr);

	val = addr[0] << 8 \| addr[1];

	/* The multicast bit is always transmitted as a zero, so the switch uses
	* bit 8 for "DiffAddr", where 0 means all ports transmit the same SA.
	*/
	val &= 0xfeff;

	ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_01, val);
	if (ret)
	return ret;

	ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_23,
	(addr[2] << 8) \| addr[3]);
	if (ret)
	return ret;

	return reg_write(priv, REG_GLOBAL, GLOBAL_MAC_45,
	(addr[4] << 8) \| addr[5]);
	}

	static int mv88e6060_setup(struct dsa_switch *ds)
	{
	struct mv88e6060_priv *priv = ds->priv;
	int ret;
	int i;

	priv->ds = ds;

	ret = mv88e6060_switch_reset(priv);
	if (ret < 0)
	return ret;

	/* @@@ initialise atu */

	ret = mv88e6060_setup_global(priv);
	if (ret < 0)
	return ret;

	ret = mv88e6060_setup_addr(priv);
	if (ret < 0)
	return ret;

	for (i = 0; i < MV88E6060_PORTS; i++) {
	ret = mv88e6060_setup_port(priv, i);
	if (ret < 0)
	return ret;
	}

	return 0;
	}

	static int mv88e6060_port_to_phy_addr(int port)
	{
	if (port >= 0 && port < MV88E6060_PORTS)
	return port;
	return -1;
	}

	static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum)
	{
	struct mv88e6060_priv *priv = ds->priv;
	int addr;

	addr = mv88e6060_port_to_phy_addr(port);
	if (addr == -1)
	return 0xffff;

	return reg_read(priv, addr, regnum);
	}

	static int
	mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
	{
	struct mv88e6060_priv *priv = ds->priv;
	int addr;

	addr = mv88e6060_port_to_phy_addr(port);
	if (addr == -1)
	return 0xffff;

	return reg_write(priv, addr, regnum, val);
	}

	static const struct dsa_switch_ops mv88e6060_switch_ops = {
	.get_tag_protocol = mv88e6060_get_tag_protocol,
	.setup = mv88e6060_setup,
	.phy_read = mv88e6060_phy_read,
	.phy_write = mv88e6060_phy_write,
	};

	static int mv88e6060_probe(struct mdio_device *mdiodev)
	{
	struct device *dev = &mdiodev->dev;
	struct mv88e6060_priv *priv;
	struct dsa_switch *ds;
	const char *name;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->bus = mdiodev->bus;
	priv->sw_addr = mdiodev->addr;

	name = mv88e6060_get_name(priv->bus, priv->sw_addr);
	if (!name)
	return -ENODEV;

	dev_info(dev, "switch %s detected\n", name);

	ds = dsa_switch_alloc(dev, MV88E6060_PORTS);
	if (!ds)
	return -ENOMEM;

	ds->priv = priv;
	ds->dev = dev;
	ds->ops = &mv88e6060_switch_ops;

	dev_set_drvdata(dev, ds);

	return dsa_register_switch(ds);
	}

	static void mv88e6060_remove(struct mdio_device *mdiodev)
	{
	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);

	dsa_unregister_switch(ds);
	}

	static const struct of_device_id mv88e6060_of_match[] = {
	{
	.compatible = "marvell,mv88e6060",
	},
	{ /* sentinel */ },
	};

	static struct mdio_driver mv88e6060_driver = {
	.probe = mv88e6060_probe,
	.remove = mv88e6060_remove,
	.mdiodrv.driver = {
	.name = "mv88e6060",
	.of_match_table = mv88e6060_of_match,
	},
	};

	mdio_module_driver(mv88e6060_driver);

	MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
	MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:mv88e6060");