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

 /*
  * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
  * Copyright (c) 2008-2009 Marvell Semiconductor
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */

 #include <linux/delay.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 dsa_switch *ds, int addr, int reg)
 {
 	struct mv88e6060_priv *priv = ds->priv;

 	return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg);
 }

 #define REG_READ(addr, reg)					\
 	({							\
 		int __ret;					\
 								\
 		__ret = reg_read(ds, addr, reg);		\
 		if (__ret < 0)					\
 			return __ret;				\
 		__ret;						\
 	})


 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
 {
 	struct mv88e6060_priv *priv = ds->priv;

 	return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
 }

 #define REG_WRITE(addr, reg, val)				\
 	({							\
 		int __ret;					\
 								\
 		__ret = reg_write(ds, addr, reg, val);		\
 		if (__ret < 0)					\
 			return __ret;				\
 	})

 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)
 {
 	return DSA_TAG_PROTO_TRAILER;
 }

 static const char *mv88e6060_drv_probe(struct device *dsa_dev,
 				       struct device *host_dev, int sw_addr,
 				       void **_priv)
 {
 	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
 	struct mv88e6060_priv *priv;
 	const char *name;

 	name = mv88e6060_get_name(bus, sw_addr);
 	if (name) {
 		priv = devm_kzalloc(dsa_dev, sizeof(*priv), GFP_KERNEL);
 		if (!priv)
 			return NULL;
 		*_priv = priv;
 		priv->bus = bus;
 		priv->sw_addr = sw_addr;
 	}

 	return name;
 }

 static int mv88e6060_switch_reset(struct dsa_switch *ds)
 {
 	int i;
 	int ret;
 	unsigned long timeout;

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

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

 	/* Reset the switch. */
 	REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 		  GLOBAL_ATU_CONTROL_SWRESET |
 		  GLOBAL_ATU_CONTROL_ATUSIZE_1024 |
 		  GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);

 	/* Wait up to one second for reset to complete. */
 	timeout = jiffies + 1 * HZ;
 	while (time_before(jiffies, timeout)) {
 		ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
 		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 dsa_switch *ds)
 {
 	/* Disable discarding of frames with excessive collisions,
 	 * set the maximum frame size to 1536 bytes, and mask all
 	 * interrupt sources.
 	 */
 	REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL, GLOBAL_CONTROL_MAX_FRAME_1536);

 	/* Enable automatic address learning, set the address
 	 * database size to 1024 entries, and set the default aging
 	 * time to 5 minutes.
 	 */
 	REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
 		  GLOBAL_ATU_CONTROL_ATUSIZE_1024 |
 		  GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);

 	return 0;
 }

 static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
 {
 	int addr = REG_PORT(p);

 	/* 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.
 	 */
 	REG_WRITE(addr, PORT_CONTROL,
 		  dsa_is_cpu_port(ds, p) ?
 			PORT_CONTROL_TRAILER |
 			PORT_CONTROL_INGRESS_MODE |
 			PORT_CONTROL_STATE_FORWARDING :
 			PORT_CONTROL_STATE_FORWARDING);

 	/* 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.
 	 */
 	REG_WRITE(addr, PORT_VLAN_MAP,
 		  ((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) |
 		   (dsa_is_cpu_port(ds, p) ?
 			ds->enabled_port_mask :
 			BIT(ds->dst->cpu_port)));

 	/* 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.
 	 */
 	REG_WRITE(addr, PORT_ASSOC_VECTOR, BIT(p));

 	return 0;
 }

 static int mv88e6060_setup(struct dsa_switch *ds)
 {
 	int ret;
 	int i;

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

 	/* @@@ initialise atu */

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

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

 	return 0;
 }

 static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr)
 {
 	/* Use the same MAC Address as FD Pause frames for all ports */
 	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_01, (addr[0] << 9) | addr[1]);
 	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_23, (addr[2] << 8) | addr[3]);
 	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_45, (addr[4] << 8) | addr[5]);

 	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)
 {
 	int addr;

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

 	return reg_read(ds, addr, regnum);
 }

 static int
 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 {
 	int addr;

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

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

 static const struct dsa_switch_ops mv88e6060_switch_ops = {
 	.get_tag_protocol = mv88e6060_get_tag_protocol,
 	.probe		= mv88e6060_drv_probe,
 	.setup		= mv88e6060_setup,
 	.set_addr	= mv88e6060_set_addr,
 	.phy_read	= mv88e6060_phy_read,
 	.phy_write	= mv88e6060_phy_write,
 };

 static struct dsa_switch_driver mv88e6060_switch_drv = {
 	.ops		= &mv88e6060_switch_ops,
 };

 static int __init mv88e6060_init(void)
 {
 	register_switch_driver(&mv88e6060_switch_drv);
 	return 0;
 }
 module_init(mv88e6060_init);

 static void __exit mv88e6060_cleanup(void)
 {
 	unregister_switch_driver(&mv88e6060_switch_drv);
 }
 module_exit(mv88e6060_cleanup);

 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:mv88e6060");
	/*
	* net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
	* Copyright (c) 2008-2009 Marvell Semiconductor
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*/

	#include <linux/delay.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 dsa_switch *ds, int addr, int reg)
	{
	struct mv88e6060_priv *priv = ds->priv;

	return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg);
	}

	#define REG_READ(addr, reg) \
	({ \
	int __ret; \
	\
	__ret = reg_read(ds, addr, reg); \
	if (__ret < 0) \
	return __ret; \
	__ret; \
	})


	static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
	{
	struct mv88e6060_priv *priv = ds->priv;

	return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val);
	}

	#define REG_WRITE(addr, reg, val) \
	({ \
	int __ret; \
	\
	__ret = reg_write(ds, addr, reg, val); \
	if (__ret < 0) \
	return __ret; \
	})

	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)
	{
	return DSA_TAG_PROTO_TRAILER;
	}

	static const char mv88e6060_drv_probe(struct device dsa_dev,
	struct device *host_dev, int sw_addr,
	void **_priv)
	{
	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
	struct mv88e6060_priv *priv;
	const char *name;

	name = mv88e6060_get_name(bus, sw_addr);
	if (name) {
	priv = devm_kzalloc(dsa_dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return NULL;
	*_priv = priv;
	priv->bus = bus;
	priv->sw_addr = sw_addr;
	}

	return name;
	}

	static int mv88e6060_switch_reset(struct dsa_switch *ds)
	{
	int i;
	int ret;
	unsigned long timeout;

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

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

	/* Reset the switch. */
	REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
	GLOBAL_ATU_CONTROL_SWRESET \|
	GLOBAL_ATU_CONTROL_ATUSIZE_1024 \|
	GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);

	/* Wait up to one second for reset to complete. */
	timeout = jiffies + 1 * HZ;
	while (time_before(jiffies, timeout)) {
	ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
	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 dsa_switch *ds)
	{
	/* Disable discarding of frames with excessive collisions,
	* set the maximum frame size to 1536 bytes, and mask all
	* interrupt sources.
	*/
	REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL, GLOBAL_CONTROL_MAX_FRAME_1536);

	/* Enable automatic address learning, set the address
	* database size to 1024 entries, and set the default aging
	* time to 5 minutes.
	*/
	REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
	GLOBAL_ATU_CONTROL_ATUSIZE_1024 \|
	GLOBAL_ATU_CONTROL_ATE_AGE_5MIN);

	return 0;
	}

	static int mv88e6060_setup_port(struct dsa_switch *ds, int p)
	{
	int addr = REG_PORT(p);

	/* 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.
	*/
	REG_WRITE(addr, PORT_CONTROL,
	dsa_is_cpu_port(ds, p) ?
	PORT_CONTROL_TRAILER \|
	PORT_CONTROL_INGRESS_MODE \|
	PORT_CONTROL_STATE_FORWARDING :
	PORT_CONTROL_STATE_FORWARDING);

	/* 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.
	*/
	REG_WRITE(addr, PORT_VLAN_MAP,
	((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) \|
	(dsa_is_cpu_port(ds, p) ?
	ds->enabled_port_mask :
	BIT(ds->dst->cpu_port)));

	/* 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.
	*/
	REG_WRITE(addr, PORT_ASSOC_VECTOR, BIT(p));

	return 0;
	}

	static int mv88e6060_setup(struct dsa_switch *ds)
	{
	int ret;
	int i;

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

	/* @@@ initialise atu */

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

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

	return 0;
	}

	static int mv88e6060_set_addr(struct dsa_switch ds, u8 addr)
	{
	/* Use the same MAC Address as FD Pause frames for all ports */
	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_01, (addr[0] << 9) \| addr[1]);
	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_23, (addr[2] << 8) \| addr[3]);
	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_45, (addr[4] << 8) \| addr[5]);

	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)
	{
	int addr;

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

	return reg_read(ds, addr, regnum);
	}

	static int
	mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
	{
	int addr;

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

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

	static const struct dsa_switch_ops mv88e6060_switch_ops = {
	.get_tag_protocol = mv88e6060_get_tag_protocol,
	.probe = mv88e6060_drv_probe,
	.setup = mv88e6060_setup,
	.set_addr = mv88e6060_set_addr,
	.phy_read = mv88e6060_phy_read,
	.phy_write = mv88e6060_phy_write,
	};

	static struct dsa_switch_driver mv88e6060_switch_drv = {
	.ops = &mv88e6060_switch_ops,
	};

	static int __init mv88e6060_init(void)
	{
	register_switch_driver(&mv88e6060_switch_drv);
	return 0;
	}
	module_init(mv88e6060_init);

	static void __exit mv88e6060_cleanup(void)
	{
	unregister_switch_driver(&mv88e6060_switch_drv);
	}
	module_exit(mv88e6060_cleanup);

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