[linux-2.6-block.git] / net / dsa / legacy.c

/*
 * net/dsa/legacy.c - Hardware switch handling
 * Copyright (c) 2008-2009 Marvell Semiconductor
 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
 *
 * 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/device.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/etherdevice.h>

#include "dsa_priv.h"

/* switch driver registration ***********************************************/
static DEFINE_MUTEX(dsa_switch_drivers_mutex);
static LIST_HEAD(dsa_switch_drivers);

void register_switch_driver(struct dsa_switch_driver *drv)
{
	mutex_lock(&dsa_switch_drivers_mutex);
	list_add_tail(&drv->list, &dsa_switch_drivers);
	mutex_unlock(&dsa_switch_drivers_mutex);
}
EXPORT_SYMBOL_GPL(register_switch_driver);

void unregister_switch_driver(struct dsa_switch_driver *drv)
{
	mutex_lock(&dsa_switch_drivers_mutex);
	list_del_init(&drv->list);
	mutex_unlock(&dsa_switch_drivers_mutex);
}
EXPORT_SYMBOL_GPL(unregister_switch_driver);

static const struct dsa_switch_ops *
dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
		 const char **_name, void **priv)
{
	const struct dsa_switch_ops *ret;
	struct list_head *list;
	const char *name;

	ret = NULL;
	name = NULL;

	mutex_lock(&dsa_switch_drivers_mutex);
	list_for_each(list, &dsa_switch_drivers) {
		const struct dsa_switch_ops *ops;
		struct dsa_switch_driver *drv;

		drv = list_entry(list, struct dsa_switch_driver, list);
		ops = drv->ops;

		name = ops->probe(parent, host_dev, sw_addr, priv);
		if (name != NULL) {
			ret = ops;
			break;
		}
	}
	mutex_unlock(&dsa_switch_drivers_mutex);

	*_name = name;

	return ret;
}

/* basic switch operations **************************************************/
static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
{
	int ret, port;

	for (port = 0; port < ds->num_ports; port++) {
		if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
			continue;

		ret = dsa_port_link_register_of(&ds->ports[port]);
		if (ret)
			return ret;
	}
	return 0;
}

static int dsa_switch_setup_one(struct dsa_switch *ds,
				struct net_device *master)
{
	const struct dsa_switch_ops *ops = ds->ops;
	struct dsa_switch_tree *dst = ds->dst;
	struct dsa_chip_data *cd = ds->cd;
	bool valid_name_found = false;
	int index = ds->index;
	struct dsa_port *dp;
	int i, ret;

	/*
	 * Validate supplied switch configuration.
	 */
	for (i = 0; i < ds->num_ports; i++) {
		char *name;

		dp = &ds->ports[i];

		name = cd->port_names[i];
		if (name == NULL)
			continue;
		dp->name = name;

		if (!strcmp(name, "cpu")) {
			if (dst->cpu_dp) {
				netdev_err(master,
					   "multiple cpu ports?!\n");
				return -EINVAL;
			}
			dst->cpu_dp = &ds->ports[i];
			dst->cpu_dp->master = master;
			dp->type = DSA_PORT_TYPE_CPU;
		} else if (!strcmp(name, "dsa")) {
			dp->type = DSA_PORT_TYPE_DSA;
		} else {
			dp->type = DSA_PORT_TYPE_USER;
		}
		valid_name_found = true;
	}

	if (!valid_name_found && i == ds->num_ports)
		return -EINVAL;

	/* Make the built-in MII bus mask match the number of ports,
	 * switch drivers can override this later
	 */
	ds->phys_mii_mask |= dsa_user_ports(ds);

	/*
	 * If the CPU connects to this switch, set the switch tree
	 * tagging protocol to the preferred tagging format of this
	 * switch.
	 */
	if (dst->cpu_dp->ds == ds) {
		const struct dsa_device_ops *tag_ops;
		enum dsa_tag_protocol tag_protocol;

		tag_protocol = ops->get_tag_protocol(ds, dst->cpu_dp->index);
		tag_ops = dsa_resolve_tag_protocol(tag_protocol);
		if (IS_ERR(tag_ops))
			return PTR_ERR(tag_ops);

		dst->cpu_dp->tag_ops = tag_ops;

		/* Few copies for faster access in master receive hot path */
		dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
		dst->cpu_dp->dst = dst;
	}

	memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));

	/*
	 * Do basic register setup.
	 */
	ret = ops->setup(ds);
	if (ret < 0)
		return ret;

	ret = dsa_switch_register_notifier(ds);
	if (ret)
		return ret;

	if (!ds->slave_mii_bus && ops->phy_read) {
		ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
		if (!ds->slave_mii_bus)
			return -ENOMEM;
		dsa_slave_mii_bus_init(ds);

		ret = mdiobus_register(ds->slave_mii_bus);
		if (ret < 0)
			return ret;
	}

	/*
	 * Create network devices for physical switch ports.
	 */
	for (i = 0; i < ds->num_ports; i++) {
		ds->ports[i].dn = cd->port_dn[i];
		ds->ports[i].cpu_dp = dst->cpu_dp;

		if (!dsa_is_user_port(ds, i))
			continue;

		ret = dsa_slave_create(&ds->ports[i]);
		if (ret < 0)
			netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
				   index, i, cd->port_names[i], ret);
	}

	/* Perform configuration of the CPU and DSA ports */
	ret = dsa_cpu_dsa_setups(ds);
	if (ret < 0)
		netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
			   index);

	return 0;
}

static struct dsa_switch *
dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
		 int index, struct device *parent, struct device *host_dev)
{
	struct dsa_chip_data *cd = dst->pd->chip + index;
	const struct dsa_switch_ops *ops;
	struct dsa_switch *ds;
	int ret;
	const char *name;
	void *priv;

	/*
	 * Probe for switch model.
	 */
	ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
	if (!ops) {
		netdev_err(master, "[%d]: could not detect attached switch\n",
			   index);
		return ERR_PTR(-EINVAL);
	}
	netdev_info(master, "[%d]: detected a %s switch\n",
		    index, name);


	/*
	 * Allocate and initialise switch state.
	 */
	ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
	if (!ds)
		return ERR_PTR(-ENOMEM);

	ds->dst = dst;
	ds->index = index;
	ds->cd = cd;
	ds->ops = ops;
	ds->priv = priv;

	ret = dsa_switch_setup_one(ds, master);
	if (ret)
		return ERR_PTR(ret);

	return ds;
}

static void dsa_switch_destroy(struct dsa_switch *ds)
{
	int port;

	/* Destroy network devices for physical switch ports. */
	for (port = 0; port < ds->num_ports; port++) {
		if (!dsa_is_user_port(ds, port))
			continue;

		if (!ds->ports[port].slave)
			continue;

		dsa_slave_destroy(ds->ports[port].slave);
	}

	/* Disable configuration of the CPU and DSA ports */
	for (port = 0; port < ds->num_ports; port++) {
		if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
			continue;
		dsa_port_link_unregister_of(&ds->ports[port]);
	}

	if (ds->slave_mii_bus && ds->ops->phy_read)
		mdiobus_unregister(ds->slave_mii_bus);

	dsa_switch_unregister_notifier(ds);
}

/* platform driver init and cleanup *****************************************/
static int dev_is_class(struct device *dev, void *class)
{
	if (dev->class != NULL && !strcmp(dev->class->name, class))
		return 1;

	return 0;
}

static struct device *dev_find_class(struct device *parent, char *class)
{
	if (dev_is_class(parent, class)) {
		get_device(parent);
		return parent;
	}

	return device_find_child(parent, class, dev_is_class);
}

struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
{
	struct device *d;

	d = dev_find_class(dev, "mdio_bus");
	if (d != NULL) {
		struct mii_bus *bus;

		bus = to_mii_bus(d);
		put_device(d);

		return bus;
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);

#ifdef CONFIG_OF
static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
					struct dsa_chip_data *cd,
					int chip_index, int port_index,
					struct device_node *link)
{
	const __be32 *reg;
	int link_sw_addr;
	struct device_node *parent_sw;
	int len;

	parent_sw = of_get_parent(link);
	if (!parent_sw)
		return -EINVAL;

	reg = of_get_property(parent_sw, "reg", &len);
	if (!reg || (len != sizeof(*reg) * 2))
		return -EINVAL;

	/*
	 * Get the destination switch number from the second field of its 'reg'
	 * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
	 */
	link_sw_addr = be32_to_cpup(reg + 1);

	if (link_sw_addr >= pd->nr_chips)
		return -EINVAL;

	cd->rtable[link_sw_addr] = port_index;

	return 0;
}

static int dsa_of_probe_links(struct dsa_platform_data *pd,
			      struct dsa_chip_data *cd,
			      int chip_index, int port_index,
			      struct device_node *port,
			      const char *port_name)
{
	struct device_node *link;
	int link_index;
	int ret;

	for (link_index = 0;; link_index++) {
		link = of_parse_phandle(port, "link", link_index);
		if (!link)
			break;

		if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
			ret = dsa_of_setup_routing_table(pd, cd, chip_index,
							 port_index, link);
			if (ret)
				return ret;
		}
	}
	return 0;
}

static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
{
	int i;
	int port_index;

	for (i = 0; i < pd->nr_chips; i++) {
		port_index = 0;
		while (port_index < DSA_MAX_PORTS) {
			kfree(pd->chip[i].port_names[port_index]);
			port_index++;
		}

		/* Drop our reference to the MDIO bus device */
		put_device(pd->chip[i].host_dev);
	}
	kfree(pd->chip);
}

static int dsa_of_probe(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct device_node *child, *mdio, *ethernet, *port;
	struct mii_bus *mdio_bus, *mdio_bus_switch;
	struct net_device *ethernet_dev;
	struct dsa_platform_data *pd;
	struct dsa_chip_data *cd;
	const char *port_name;
	int chip_index, port_index;
	const unsigned int *sw_addr, *port_reg;
	u32 eeprom_len;
	int ret;

	mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
	if (!mdio)
		return -EINVAL;

	mdio_bus = of_mdio_find_bus(mdio);
	if (!mdio_bus)
		return -EPROBE_DEFER;

	ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
	if (!ethernet) {
		ret = -EINVAL;
		goto out_put_mdio;
	}

	ethernet_dev = of_find_net_device_by_node(ethernet);
	if (!ethernet_dev) {
		ret = -EPROBE_DEFER;
		goto out_put_mdio;
	}

	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	if (!pd) {
		ret = -ENOMEM;
		goto out_put_ethernet;
	}

	dev->platform_data = pd;
	pd->of_netdev = ethernet_dev;
	pd->nr_chips = of_get_available_child_count(np);
	if (pd->nr_chips > DSA_MAX_SWITCHES)
		pd->nr_chips = DSA_MAX_SWITCHES;

	pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
			   GFP_KERNEL);
	if (!pd->chip) {
		ret = -ENOMEM;
		goto out_free;
	}

	chip_index = -1;
	for_each_available_child_of_node(np, child) {
		int i;

		chip_index++;
		cd = &pd->chip[chip_index];

		cd->of_node = child;

		/* Initialize the routing table */
		for (i = 0; i < DSA_MAX_SWITCHES; ++i)
			cd->rtable[i] = DSA_RTABLE_NONE;

		/* When assigning the host device, increment its refcount */
		cd->host_dev = get_device(&mdio_bus->dev);

		sw_addr = of_get_property(child, "reg", NULL);
		if (!sw_addr)
			continue;

		cd->sw_addr = be32_to_cpup(sw_addr);
		if (cd->sw_addr >= PHY_MAX_ADDR)
			continue;

		if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
			cd->eeprom_len = eeprom_len;

		mdio = of_parse_phandle(child, "mii-bus", 0);
		if (mdio) {
			mdio_bus_switch = of_mdio_find_bus(mdio);
			if (!mdio_bus_switch) {
				ret = -EPROBE_DEFER;
				goto out_free_chip;
			}

			/* Drop the mdio_bus device ref, replacing the host
			 * device with the mdio_bus_switch device, keeping
			 * the refcount from of_mdio_find_bus() above.
			 */
			put_device(cd->host_dev);
			cd->host_dev = &mdio_bus_switch->dev;
		}

		for_each_available_child_of_node(child, port) {
			port_reg = of_get_property(port, "reg", NULL);
			if (!port_reg)
				continue;

			port_index = be32_to_cpup(port_reg);
			if (port_index >= DSA_MAX_PORTS)
				break;

			port_name = of_get_property(port, "label", NULL);
			if (!port_name)
				continue;

			cd->port_dn[port_index] = port;

			cd->port_names[port_index] = kstrdup(port_name,
					GFP_KERNEL);
			if (!cd->port_names[port_index]) {
				ret = -ENOMEM;
				goto out_free_chip;
			}

			ret = dsa_of_probe_links(pd, cd, chip_index,
						 port_index, port, port_name);
			if (ret)
				goto out_free_chip;

		}
	}

	/* The individual chips hold their own refcount on the mdio bus,
	 * so drop ours */
	put_device(&mdio_bus->dev);

	return 0;

out_free_chip:
	dsa_of_free_platform_data(pd);
out_free:
	kfree(pd);
	dev->platform_data = NULL;
out_put_ethernet:
	put_device(&ethernet_dev->dev);
out_put_mdio:
	put_device(&mdio_bus->dev);
	return ret;
}

static void dsa_of_remove(struct device *dev)
{
	struct dsa_platform_data *pd = dev->platform_data;

	if (!dev->of_node)
		return;

	dsa_of_free_platform_data(pd);
	put_device(&pd->of_netdev->dev);
	kfree(pd);
}
#else
static inline int dsa_of_probe(struct device *dev)
{
	return 0;
}

static inline void dsa_of_remove(struct device *dev)
{
}
#endif

static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
			 struct device *parent, struct dsa_platform_data *pd)
{
	int i;
	unsigned configured = 0;

	dst->pd = pd;

	for (i = 0; i < pd->nr_chips; i++) {
		struct dsa_switch *ds;

		ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
		if (IS_ERR(ds)) {
			netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
				   i, PTR_ERR(ds));
			continue;
		}

		dst->ds[i] = ds;

		++configured;
	}

	/*
	 * If no switch was found, exit cleanly
	 */
	if (!configured)
		return -EPROBE_DEFER;

	return dsa_master_setup(dst->cpu_dp->master, dst->cpu_dp);
}

static int dsa_probe(struct platform_device *pdev)
{
	struct dsa_platform_data *pd = pdev->dev.platform_data;
	struct net_device *dev;
	struct dsa_switch_tree *dst;
	int ret;

	if (pdev->dev.of_node) {
		ret = dsa_of_probe(&pdev->dev);
		if (ret)
			return ret;

		pd = pdev->dev.platform_data;
	}

	if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
		return -EINVAL;

	if (pd->of_netdev) {
		dev = pd->of_netdev;
		dev_hold(dev);
	} else {
		dev = dsa_dev_to_net_device(pd->netdev);
	}
	if (dev == NULL) {
		ret = -EPROBE_DEFER;
		goto out;
	}

	if (dev->dsa_ptr != NULL) {
		dev_put(dev);
		ret = -EEXIST;
		goto out;
	}

	dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
	if (dst == NULL) {
		dev_put(dev);
		ret = -ENOMEM;
		goto out;
	}

	platform_set_drvdata(pdev, dst);

	ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
	if (ret) {
		dev_put(dev);
		goto out;
	}

	return 0;

out:
	dsa_of_remove(&pdev->dev);

	return ret;
}

static void dsa_remove_dst(struct dsa_switch_tree *dst)
{
	int i;

	dsa_master_teardown(dst->cpu_dp->master);

	for (i = 0; i < dst->pd->nr_chips; i++) {
		struct dsa_switch *ds = dst->ds[i];

		if (ds)
			dsa_switch_destroy(ds);
	}

	dev_put(dst->cpu_dp->master);
}

static int dsa_remove(struct platform_device *pdev)
{
	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);

	dsa_remove_dst(dst);
	dsa_of_remove(&pdev->dev);

	return 0;
}

static void dsa_shutdown(struct platform_device *pdev)
{
}

#ifdef CONFIG_PM_SLEEP
static int dsa_suspend(struct device *d)
{
	struct dsa_switch_tree *dst = dev_get_drvdata(d);
	int i, ret = 0;

	for (i = 0; i < dst->pd->nr_chips; i++) {
		struct dsa_switch *ds = dst->ds[i];

		if (ds != NULL)
			ret = dsa_switch_suspend(ds);
	}

	return ret;
}

static int dsa_resume(struct device *d)
{
	struct dsa_switch_tree *dst = dev_get_drvdata(d);
	int i, ret = 0;

	for (i = 0; i < dst->pd->nr_chips; i++) {
		struct dsa_switch *ds = dst->ds[i];

		if (ds != NULL)
			ret = dsa_switch_resume(ds);
	}

	return ret;
}
#endif

static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);

static const struct of_device_id dsa_of_match_table[] = {
	{ .compatible = "marvell,dsa", },
	{}
};
MODULE_DEVICE_TABLE(of, dsa_of_match_table);

static struct platform_driver dsa_driver = {
	.probe		= dsa_probe,
	.remove		= dsa_remove,
	.shutdown	= dsa_shutdown,
	.driver = {
		.name	= "dsa",
		.of_match_table = dsa_of_match_table,
		.pm	= &dsa_pm_ops,
	},
};

int dsa_legacy_register(void)
{
	return platform_driver_register(&dsa_driver);
}

void dsa_legacy_unregister(void)
{
	platform_driver_unregister(&dsa_driver);
}
Commit	Line	Data
a6a71f19 VD	1	/*
	2	* net/dsa/legacy.c - Hardware switch handling
	3	* Copyright (c) 2008-2009 Marvell Semiconductor
	4	* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/device.h>
	13	#include <linux/list.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/slab.h>
	16	#include <linux/module.h>
	17	#include <linux/of.h>
	18	#include <linux/of_mdio.h>
	19	#include <linux/of_platform.h>
	20	#include <linux/of_net.h>
	21	#include <linux/netdevice.h>
	22	#include <linux/sysfs.h>
	23	#include <linux/phy_fixed.h>
	24	#include <linux/etherdevice.h>
ea5dd34b	25
a6a71f19 VD	26	#include "dsa_priv.h"
	27
	28	/* switch driver registration ***********************************************/
	29	static DEFINE_MUTEX(dsa_switch_drivers_mutex);
	30	static LIST_HEAD(dsa_switch_drivers);
	31
	32	void register_switch_driver(struct dsa_switch_driver *drv)
	33	{
	34	mutex_lock(&dsa_switch_drivers_mutex);
	35	list_add_tail(&drv->list, &dsa_switch_drivers);
	36	mutex_unlock(&dsa_switch_drivers_mutex);
	37	}
	38	EXPORT_SYMBOL_GPL(register_switch_driver);
	39
	40	void unregister_switch_driver(struct dsa_switch_driver *drv)
	41	{
	42	mutex_lock(&dsa_switch_drivers_mutex);
	43	list_del_init(&drv->list);
	44	mutex_unlock(&dsa_switch_drivers_mutex);
	45	}
	46	EXPORT_SYMBOL_GPL(unregister_switch_driver);
	47
	48	static const struct dsa_switch_ops *
	49	dsa_switch_probe(struct device parent, struct device host_dev, int sw_addr,
	50	const char _name, void priv)
	51	{
	52	const struct dsa_switch_ops *ret;
	53	struct list_head *list;
	54	const char *name;
	55
	56	ret = NULL;
	57	name = NULL;
	58
	59	mutex_lock(&dsa_switch_drivers_mutex);
	60	list_for_each(list, &dsa_switch_drivers) {
	61	const struct dsa_switch_ops *ops;
	62	struct dsa_switch_driver *drv;
	63
	64	drv = list_entry(list, struct dsa_switch_driver, list);
	65	ops = drv->ops;
	66
	67	name = ops->probe(parent, host_dev, sw_addr, priv);
	68	if (name != NULL) {
	69	ret = ops;
	70	break;
	71	}
	72	}
	73	mutex_unlock(&dsa_switch_drivers_mutex);
	74
	75	*_name = name;
	76
	77	return ret;
	78	}
	79
	80	/* basic switch operations **************************************************/
206e41fe	81	static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
a6a71f19	82	{
a6a71f19 VD	83	int ret, port;
	84
	85	for (port = 0; port < ds->num_ports; port++) {
	86	if (!(dsa_is_cpu_port(ds, port) \|\| dsa_is_dsa_port(ds, port)))
	87	continue;
	88
33615367	89	ret = dsa_port_link_register_of(&ds->ports[port]);
a6a71f19 VD	90	if (ret)
	91	return ret;
	92	}
	93	return 0;
	94	}
	95
206e41fe VD	96	static int dsa_switch_setup_one(struct dsa_switch *ds,
206e41fe VD	97	struct net_device *master)
a6a71f19 VD	98	{
	99	const struct dsa_switch_ops *ops = ds->ops;
	100	struct dsa_switch_tree *dst = ds->dst;
	101	struct dsa_chip_data *cd = ds->cd;
	102	bool valid_name_found = false;
	103	int index = ds->index;
057cad2c	104	struct dsa_port *dp;
a6a71f19 VD	105	int i, ret;
	106
	107	/*
	108	* Validate supplied switch configuration.
	109	*/
	110	for (i = 0; i < ds->num_ports; i++) {
	111	char *name;
	112
057cad2c VD	113	dp = &ds->ports[i];
057cad2c VD	114
a6a71f19 VD	115	name = cd->port_names[i];
	116	if (name == NULL)
	117	continue;
1838fa89	118	dp->name = name;
a6a71f19 VD	119
a6a71f19 VD	120	if (!strcmp(name, "cpu")) {
8b0d3ea5	121	if (dst->cpu_dp) {
6d3c8c0d	122	netdev_err(master,
a6a71f19 VD	123	"multiple cpu ports?!\n");
	124	return -EINVAL;
	125	}
8b0d3ea5	126	dst->cpu_dp = &ds->ports[i];
f8b8b1cd	127	dst->cpu_dp->master = master;
057cad2c	128	dp->type = DSA_PORT_TYPE_CPU;
a6a71f19	129	} else if (!strcmp(name, "dsa")) {
057cad2c	130	dp->type = DSA_PORT_TYPE_DSA;
a6a71f19	131	} else {
057cad2c	132	dp->type = DSA_PORT_TYPE_USER;
a6a71f19 VD	133	}
	134	valid_name_found = true;
	135	}
	136
	137	if (!valid_name_found && i == ds->num_ports)
	138	return -EINVAL;
	139
	140	/* Make the built-in MII bus mask match the number of ports,
	141	* switch drivers can override this later
	142	*/
02bc6e54	143	ds->phys_mii_mask \|= dsa_user_ports(ds);
a6a71f19 VD	144
	145	/*
	146	* If the CPU connects to this switch, set the switch tree
	147	* tagging protocol to the preferred tagging format of this
	148	* switch.
	149	*/
8b0d3ea5	150	if (dst->cpu_dp->ds == ds) {
62fc9587	151	const struct dsa_device_ops *tag_ops;
a6a71f19 VD	152	enum dsa_tag_protocol tag_protocol;
a6a71f19 VD	153
5ed4e3eb	154	tag_protocol = ops->get_tag_protocol(ds, dst->cpu_dp->index);
62fc9587 VD	155	tag_ops = dsa_resolve_tag_protocol(tag_protocol);
	156	if (IS_ERR(tag_ops))
	157	return PTR_ERR(tag_ops);
a6a71f19	158
15240248	159	dst->cpu_dp->tag_ops = tag_ops;
3e41f93b VD	160
	161	/* Few copies for faster access in master receive hot path */
	162	dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
3e41f93b	163	dst->cpu_dp->dst = dst;
a6a71f19 VD	164	}
	165
	166	memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
	167
	168	/*
	169	* Do basic register setup.
	170	*/
	171	ret = ops->setup(ds);
	172	if (ret < 0)
	173	return ret;
	174
	175	ret = dsa_switch_register_notifier(ds);
	176	if (ret)
	177	return ret;
	178
a6a71f19	179	if (!ds->slave_mii_bus && ops->phy_read) {
206e41fe	180	ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
a6a71f19 VD	181	if (!ds->slave_mii_bus)
	182	return -ENOMEM;
	183	dsa_slave_mii_bus_init(ds);
	184
	185	ret = mdiobus_register(ds->slave_mii_bus);
	186	if (ret < 0)
	187	return ret;
	188	}
	189
	190	/*
	191	* Create network devices for physical switch ports.
	192	*/
	193	for (i = 0; i < ds->num_ports; i++) {
	194	ds->ports[i].dn = cd->port_dn[i];
06d4d450	195	ds->ports[i].cpu_dp = dst->cpu_dp;
a6a71f19	196
5a9f8df6	197	if (!dsa_is_user_port(ds, i))
a6a71f19 VD	198	continue;
a6a71f19 VD	199
951259aa	200	ret = dsa_slave_create(&ds->ports[i]);
a6a71f19	201	if (ret < 0)
6d3c8c0d	202	netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
a6a71f19 VD	203	index, i, cd->port_names[i], ret);
	204	}
	205
	206	/* Perform configuration of the CPU and DSA ports */
206e41fe	207	ret = dsa_cpu_dsa_setups(ds);
a6a71f19	208	if (ret < 0)
6d3c8c0d	209	netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
a6a71f19 VD	210	index);
a6a71f19 VD	211
a6a71f19 VD	212	return 0;
	213	}
	214
	215	static struct dsa_switch *
06d4d450 FF	216	dsa_switch_setup(struct dsa_switch_tree dst, struct net_device master,
06d4d450 FF	217	int index, struct device parent, struct device host_dev)
a6a71f19 VD	218	{
	219	struct dsa_chip_data *cd = dst->pd->chip + index;
	220	const struct dsa_switch_ops *ops;
	221	struct dsa_switch *ds;
	222	int ret;
	223	const char *name;
	224	void *priv;
	225
	226	/*
	227	* Probe for switch model.
	228	*/
	229	ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
	230	if (!ops) {
6d3c8c0d	231	netdev_err(master, "[%d]: could not detect attached switch\n",
a6a71f19 VD	232	index);
	233	return ERR_PTR(-EINVAL);
	234	}
6d3c8c0d	235	netdev_info(master, "[%d]: detected a %s switch\n",
a6a71f19 VD	236	index, name);
	237
	238
	239	/*
	240	* Allocate and initialise switch state.
	241	*/
	242	ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
	243	if (!ds)
	244	return ERR_PTR(-ENOMEM);
	245
	246	ds->dst = dst;
	247	ds->index = index;
	248	ds->cd = cd;
	249	ds->ops = ops;
	250	ds->priv = priv;
	251
206e41fe	252	ret = dsa_switch_setup_one(ds, master);
a6a71f19 VD	253	if (ret)
	254	return ERR_PTR(ret);
	255
	256	return ds;
	257	}
	258
	259	static void dsa_switch_destroy(struct dsa_switch *ds)
	260	{
	261	int port;
	262
	263	/* Destroy network devices for physical switch ports. */
	264	for (port = 0; port < ds->num_ports; port++) {
4a5b85ff	265	if (!dsa_is_user_port(ds, port))
a6a71f19 VD	266	continue;
a6a71f19 VD	267
f8b8b1cd	268	if (!ds->ports[port].slave)
a6a71f19 VD	269	continue;
a6a71f19 VD	270
f8b8b1cd	271	dsa_slave_destroy(ds->ports[port].slave);
a6a71f19 VD	272	}
	273
	274	/* Disable configuration of the CPU and DSA ports */
	275	for (port = 0; port < ds->num_ports; port++) {
	276	if (!(dsa_is_cpu_port(ds, port) \|\| dsa_is_dsa_port(ds, port)))
	277	continue;
33615367	278	dsa_port_link_unregister_of(&ds->ports[port]);
a6a71f19 VD	279	}
	280
	281	if (ds->slave_mii_bus && ds->ops->phy_read)
	282	mdiobus_unregister(ds->slave_mii_bus);
	283
	284	dsa_switch_unregister_notifier(ds);
	285	}
	286
a6a71f19 VD	287	/* platform driver init and cleanup *****************************************/
	288	static int dev_is_class(struct device dev, void class)
	289	{
	290	if (dev->class != NULL && !strcmp(dev->class->name, class))
	291	return 1;
	292
	293	return 0;
	294	}
	295
	296	static struct device dev_find_class(struct device parent, char *class)
	297	{
	298	if (dev_is_class(parent, class)) {
	299	get_device(parent);
	300	return parent;
	301	}
	302
	303	return device_find_child(parent, class, dev_is_class);
	304	}
	305
	306	struct mii_bus dsa_host_dev_to_mii_bus(struct device dev)
	307	{
	308	struct device *d;
	309
	310	d = dev_find_class(dev, "mdio_bus");
	311	if (d != NULL) {
	312	struct mii_bus *bus;
	313
	314	bus = to_mii_bus(d);
	315	put_device(d);
	316
	317	return bus;
	318	}
	319
	320	return NULL;
	321	}
	322	EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
	323
	324	#ifdef CONFIG_OF
	325	static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
	326	struct dsa_chip_data *cd,
	327	int chip_index, int port_index,
	328	struct device_node *link)
	329	{
	330	const __be32 *reg;
	331	int link_sw_addr;
	332	struct device_node *parent_sw;
	333	int len;
	334
	335	parent_sw = of_get_parent(link);
	336	if (!parent_sw)
	337	return -EINVAL;
	338
	339	reg = of_get_property(parent_sw, "reg", &len);
	340	if (!reg \|\| (len != sizeof(reg) 2))
	341	return -EINVAL;
	342
	343	/*
	344	* Get the destination switch number from the second field of its 'reg'
	345	* property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
	346	*/
	347	link_sw_addr = be32_to_cpup(reg + 1);
	348
	349	if (link_sw_addr >= pd->nr_chips)
	350	return -EINVAL;
351
352	cd->rtable[link_sw_addr] = port_index;
353
354	return 0;
355	}
356
357	static int dsa_of_probe_links(struct dsa_platform_data *pd,
358	struct dsa_chip_data *cd,
359	int chip_index, int port_index,
360	struct device_node *port,
361	const char *port_name)
362	{
363	struct device_node *link;
364	int link_index;
365	int ret;
366
367	for (link_index = 0;; link_index++) {
368	link = of_parse_phandle(port, "link", link_index);
369	if (!link)
370	break;
371
372	if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
373	ret = dsa_of_setup_routing_table(pd, cd, chip_index,
374	port_index, link);
375	if (ret)
376	return ret;
377	}
378	}
379	return 0;
380	}
381
382	static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
383	{
384	int i;
385	int port_index;
386
387	for (i = 0; i < pd->nr_chips; i++) {
388	port_index = 0;
389	while (port_index < DSA_MAX_PORTS) {
390	kfree(pd->chip[i].port_names[port_index]);
391	port_index++;
392	}
393
394	/* Drop our reference to the MDIO bus device */
b458925e	395	put_device(pd->chip[i].host_dev);
a6a71f19 VD	396	}
	397	kfree(pd->chip);
	398	}
	399
	400	static int dsa_of_probe(struct device *dev)
	401	{
	402	struct device_node *np = dev->of_node;
	403	struct device_node child, mdio, ethernet, port;
	404	struct mii_bus mdio_bus, mdio_bus_switch;
	405	struct net_device *ethernet_dev;
	406	struct dsa_platform_data *pd;
	407	struct dsa_chip_data *cd;
	408	const char *port_name;
	409	int chip_index, port_index;
	410	const unsigned int sw_addr, port_reg;
	411	u32 eeprom_len;
	412	int ret;
	413
	414	mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
	415	if (!mdio)
	416	return -EINVAL;
	417
	418	mdio_bus = of_mdio_find_bus(mdio);
	419	if (!mdio_bus)
	420	return -EPROBE_DEFER;
	421
	422	ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
	423	if (!ethernet) {
	424	ret = -EINVAL;
	425	goto out_put_mdio;
	426	}
	427
	428	ethernet_dev = of_find_net_device_by_node(ethernet);
	429	if (!ethernet_dev) {
	430	ret = -EPROBE_DEFER;
	431	goto out_put_mdio;
	432	}
	433
	434	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	435	if (!pd) {
	436	ret = -ENOMEM;
	437	goto out_put_ethernet;
	438	}
	439
	440	dev->platform_data = pd;
	441	pd->of_netdev = ethernet_dev;
	442	pd->nr_chips = of_get_available_child_count(np);
	443	if (pd->nr_chips > DSA_MAX_SWITCHES)
	444	pd->nr_chips = DSA_MAX_SWITCHES;
	445
	446	pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
	447	GFP_KERNEL);
	448	if (!pd->chip) {
	449	ret = -ENOMEM;
	450	goto out_free;
	451	}
	452
	453	chip_index = -1;
	454	for_each_available_child_of_node(np, child) {
	455	int i;
	456
	457	chip_index++;
	458	cd = &pd->chip[chip_index];
	459
460	cd->of_node = child;
461
462	/* Initialize the routing table */
463	for (i = 0; i < DSA_MAX_SWITCHES; ++i)
464	cd->rtable[i] = DSA_RTABLE_NONE;
465
466	/* When assigning the host device, increment its refcount */
467	cd->host_dev = get_device(&mdio_bus->dev);
468
469	sw_addr = of_get_property(child, "reg", NULL);
470	if (!sw_addr)
471	continue;
472
473	cd->sw_addr = be32_to_cpup(sw_addr);
474	if (cd->sw_addr >= PHY_MAX_ADDR)
475	continue;
476
477	if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
478	cd->eeprom_len = eeprom_len;
479
480	mdio = of_parse_phandle(child, "mii-bus", 0);
481	if (mdio) {
482	mdio_bus_switch = of_mdio_find_bus(mdio);
483	if (!mdio_bus_switch) {
484	ret = -EPROBE_DEFER;
485	goto out_free_chip;
486	}
487
488	/* Drop the mdio_bus device ref, replacing the host
489	* device with the mdio_bus_switch device, keeping
490	* the refcount from of_mdio_find_bus() above.
491	*/
492	put_device(cd->host_dev);
493	cd->host_dev = &mdio_bus_switch->dev;
494	}
495
496	for_each_available_child_of_node(child, port) {
497	port_reg = of_get_property(port, "reg", NULL);
498	if (!port_reg)
499	continue;
500
501	port_index = be32_to_cpup(port_reg);
502	if (port_index >= DSA_MAX_PORTS)
503	break;
504
505	port_name = of_get_property(port, "label", NULL);
506	if (!port_name)
507	continue;
508
509	cd->port_dn[port_index] = port;
510
511	cd->port_names[port_index] = kstrdup(port_name,
512	GFP_KERNEL);
513	if (!cd->port_names[port_index]) {
514	ret = -ENOMEM;
515	goto out_free_chip;
516	}
517
518	ret = dsa_of_probe_links(pd, cd, chip_index,
519	port_index, port, port_name);
520	if (ret)
521	goto out_free_chip;
522
523	}
524	}
525
526	/* The individual chips hold their own refcount on the mdio bus,
527	* so drop ours */
528	put_device(&mdio_bus->dev);
529
530	return 0;
531
532	out_free_chip:
533	dsa_of_free_platform_data(pd);
534	out_free:
535	kfree(pd);
536	dev->platform_data = NULL;
537	out_put_ethernet:
538	put_device(&ethernet_dev->dev);
539	out_put_mdio:
540	put_device(&mdio_bus->dev);
541	return ret;
542	}
543
544	static void dsa_of_remove(struct device *dev)
545	{
546	struct dsa_platform_data *pd = dev->platform_data;
547
548	if (!dev->of_node)
549	return;
550
551	dsa_of_free_platform_data(pd);
552	put_device(&pd->of_netdev->dev);
553	kfree(pd);
554	}
555	#else
556	static inline int dsa_of_probe(struct device *dev)
557	{
558	return 0;
559	}
560
561	static inline void dsa_of_remove(struct device *dev)
562	{
563	}
564	#endif
565
566	static int dsa_setup_dst(struct dsa_switch_tree dst, struct net_device dev,
567	struct device parent, struct dsa_platform_data pd)
568	{
569	int i;
570	unsigned configured = 0;
571
572	dst->pd = pd;
a6a71f19 VD	573
	574	for (i = 0; i < pd->nr_chips; i++) {
	575	struct dsa_switch *ds;
	576
06d4d450	577	ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
a6a71f19 VD	578	if (IS_ERR(ds)) {
	579	netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
	580	i, PTR_ERR(ds));
	581	continue;
	582	}
	583
	584	dst->ds[i] = ds;
	585
	586	++configured;
	587	}
	588
	589	/*
	590	* If no switch was found, exit cleanly
	591	*/
	592	if (!configured)
	593	return -EPROBE_DEFER;
	594
17a22fcf	595	return dsa_master_setup(dst->cpu_dp->master, dst->cpu_dp);
a6a71f19 VD	596	}
	597
	598	static int dsa_probe(struct platform_device *pdev)
	599	{
	600	struct dsa_platform_data *pd = pdev->dev.platform_data;
	601	struct net_device *dev;
	602	struct dsa_switch_tree *dst;
	603	int ret;
	604
	605	if (pdev->dev.of_node) {
	606	ret = dsa_of_probe(&pdev->dev);
	607	if (ret)
	608	return ret;
	609
	610	pd = pdev->dev.platform_data;
	611	}
	612
	613	if (pd == NULL \|\| (pd->netdev == NULL && pd->of_netdev == NULL))
	614	return -EINVAL;
	615
	616	if (pd->of_netdev) {
	617	dev = pd->of_netdev;
	618	dev_hold(dev);
	619	} else {
	620	dev = dsa_dev_to_net_device(pd->netdev);
	621	}
	622	if (dev == NULL) {
	623	ret = -EPROBE_DEFER;
	624	goto out;
	625	}
	626
	627	if (dev->dsa_ptr != NULL) {
	628	dev_put(dev);
	629	ret = -EEXIST;
	630	goto out;
	631	}
	632
	633	dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
	634	if (dst == NULL) {
	635	dev_put(dev);
	636	ret = -ENOMEM;
	637	goto out;
	638	}
	639
	640	platform_set_drvdata(pdev, dst);
	641
	642	ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
	643	if (ret) {
	644	dev_put(dev);
	645	goto out;
	646	}
	647
	648	return 0;
	649
	650	out:
	651	dsa_of_remove(&pdev->dev);
	652
	653	return ret;
	654	}
	655
	656	static void dsa_remove_dst(struct dsa_switch_tree *dst)
	657	{
	658	int i;
	659
17a22fcf	660	dsa_master_teardown(dst->cpu_dp->master);
a6a71f19 VD	661
	662	for (i = 0; i < dst->pd->nr_chips; i++) {
	663	struct dsa_switch *ds = dst->ds[i];
	664
	665	if (ds)
	666	dsa_switch_destroy(ds);
	667	}
	668
f8b8b1cd	669	dev_put(dst->cpu_dp->master);
a6a71f19 VD	670	}
	671
	672	static int dsa_remove(struct platform_device *pdev)
	673	{
	674	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
	675
	676	dsa_remove_dst(dst);
	677	dsa_of_remove(&pdev->dev);
	678
	679	return 0;
	680	}
	681
	682	static void dsa_shutdown(struct platform_device *pdev)
	683	{
	684	}
	685
	686	#ifdef CONFIG_PM_SLEEP
	687	static int dsa_suspend(struct device *d)
	688	{
2af1ccd5	689	struct dsa_switch_tree *dst = dev_get_drvdata(d);
a6a71f19 VD	690	int i, ret = 0;
	691
	692	for (i = 0; i < dst->pd->nr_chips; i++) {
	693	struct dsa_switch *ds = dst->ds[i];
	694
	695	if (ds != NULL)
	696	ret = dsa_switch_suspend(ds);
	697	}
	698
	699	return ret;
	700	}
	701
	702	static int dsa_resume(struct device *d)
	703	{
2af1ccd5	704	struct dsa_switch_tree *dst = dev_get_drvdata(d);
a6a71f19 VD	705	int i, ret = 0;
	706
	707	for (i = 0; i < dst->pd->nr_chips; i++) {
	708	struct dsa_switch *ds = dst->ds[i];
	709
	710	if (ds != NULL)
	711	ret = dsa_switch_resume(ds);
	712	}
	713
	714	return ret;
	715	}
	716	#endif
	717
	718	static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
	719
	720	static const struct of_device_id dsa_of_match_table[] = {
	721	{ .compatible = "marvell,dsa", },
	722	{}
	723	};
	724	MODULE_DEVICE_TABLE(of, dsa_of_match_table);
	725
	726	static struct platform_driver dsa_driver = {
	727	.probe = dsa_probe,
	728	.remove = dsa_remove,
	729	.shutdown = dsa_shutdown,
	730	.driver = {
	731	.name = "dsa",
	732	.of_match_table = dsa_of_match_table,
	733	.pm = &dsa_pm_ops,
	734	},
	735	};
	736
	737	int dsa_legacy_register(void)
	738	{
	739	return platform_driver_register(&dsa_driver);
	740	}
	741
	742	void dsa_legacy_unregister(void)
	743	{
	744	platform_driver_unregister(&dsa_driver);
	745	}