dsa.c 22.9 KB
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/*
 * net/dsa/dsa.c - Hardware switch handling
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 * Copyright (c) 2008-2009 Marvell Semiconductor
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 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
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 *
 * 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.
 */

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#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/hwmon.h>
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#include <linux/list.h>
#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <net/dsa.h>
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#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
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#include <linux/of_net.h>
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#include <linux/of_gpio.h>
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#include <linux/sysfs.h>
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#include <linux/phy_fixed.h>
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#include <linux/gpio/consumer.h>
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#include "dsa_priv.h"

char dsa_driver_version[] = "0.1";


/* 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);
}
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EXPORT_SYMBOL_GPL(register_switch_driver);
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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);
}
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EXPORT_SYMBOL_GPL(unregister_switch_driver);
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static struct dsa_switch_driver *
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dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
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{
	struct dsa_switch_driver *ret;
	struct list_head *list;
	char *name;

	ret = NULL;
	name = NULL;

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

		drv = list_entry(list, struct dsa_switch_driver, list);

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

	*_name = name;

	return ret;
}

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/* hwmon support ************************************************************/

#ifdef CONFIG_NET_DSA_HWMON

static ssize_t temp1_input_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct dsa_switch *ds = dev_get_drvdata(dev);
	int temp, ret;

	ret = ds->drv->get_temp(ds, &temp);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", temp * 1000);
}
static DEVICE_ATTR_RO(temp1_input);

static ssize_t temp1_max_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct dsa_switch *ds = dev_get_drvdata(dev);
	int temp, ret;

	ret = ds->drv->get_temp_limit(ds, &temp);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", temp * 1000);
}

static ssize_t temp1_max_store(struct device *dev,
			       struct device_attribute *attr, const char *buf,
			       size_t count)
{
	struct dsa_switch *ds = dev_get_drvdata(dev);
	int temp, ret;

	ret = kstrtoint(buf, 0, &temp);
	if (ret < 0)
		return ret;

	ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
	if (ret < 0)
		return ret;

	return count;
}
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static DEVICE_ATTR_RW(temp1_max);
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static ssize_t temp1_max_alarm_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct dsa_switch *ds = dev_get_drvdata(dev);
	bool alarm;
	int ret;

	ret = ds->drv->get_temp_alarm(ds, &alarm);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", alarm);
}
static DEVICE_ATTR_RO(temp1_max_alarm);

static struct attribute *dsa_hwmon_attrs[] = {
	&dev_attr_temp1_input.attr,	/* 0 */
	&dev_attr_temp1_max.attr,	/* 1 */
	&dev_attr_temp1_max_alarm.attr,	/* 2 */
	NULL
};

static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
				       struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct dsa_switch *ds = dev_get_drvdata(dev);
	struct dsa_switch_driver *drv = ds->drv;
	umode_t mode = attr->mode;

	if (index == 1) {
		if (!drv->get_temp_limit)
			mode = 0;
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		else if (!drv->set_temp_limit)
			mode &= ~S_IWUSR;
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	} else if (index == 2 && !drv->get_temp_alarm) {
		mode = 0;
	}
	return mode;
}

static const struct attribute_group dsa_hwmon_group = {
	.attrs = dsa_hwmon_attrs,
	.is_visible = dsa_hwmon_attrs_visible,
};
__ATTRIBUTE_GROUPS(dsa_hwmon);

#endif /* CONFIG_NET_DSA_HWMON */
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/* basic switch operations **************************************************/
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static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
{
	struct dsa_chip_data *cd = ds->pd;
	struct device_node *port_dn;
	struct phy_device *phydev;
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	int ret, port, mode;
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	for (port = 0; port < DSA_MAX_PORTS; port++) {
		if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
			continue;

		port_dn = cd->port_dn[port];
		if (of_phy_is_fixed_link(port_dn)) {
			ret = of_phy_register_fixed_link(port_dn);
			if (ret) {
				netdev_err(master,
					   "failed to register fixed PHY\n");
				return ret;
			}
			phydev = of_phy_find_device(port_dn);
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			mode = of_get_phy_mode(port_dn);
			if (mode < 0)
				mode = PHY_INTERFACE_MODE_NA;
			phydev->interface = mode;

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			genphy_config_init(phydev);
			genphy_read_status(phydev);
			if (ds->drv->adjust_link)
				ds->drv->adjust_link(ds, port, phydev);
		}
	}
	return 0;
}

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static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
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{
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	struct dsa_switch_driver *drv = ds->drv;
	struct dsa_switch_tree *dst = ds->dst;
	struct dsa_chip_data *pd = ds->pd;
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	bool valid_name_found = false;
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	int index = ds->index;
	int i, ret;
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	/*
	 * Validate supplied switch configuration.
	 */
	for (i = 0; i < DSA_MAX_PORTS; i++) {
		char *name;

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

		if (!strcmp(name, "cpu")) {
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			if (dst->cpu_switch != -1) {
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				netdev_err(dst->master_netdev,
					   "multiple cpu ports?!\n");
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				ret = -EINVAL;
				goto out;
			}
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			dst->cpu_switch = index;
			dst->cpu_port = i;
		} else if (!strcmp(name, "dsa")) {
			ds->dsa_port_mask |= 1 << i;
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		} else {
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			ds->phys_port_mask |= 1 << i;
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		}
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		valid_name_found = true;
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	}

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	if (!valid_name_found && i == DSA_MAX_PORTS) {
		ret = -EINVAL;
		goto out;
	}
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	/* Make the built-in MII bus mask match the number of ports,
	 * switch drivers can override this later
	 */
	ds->phys_mii_mask = ds->phys_port_mask;

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	/*
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	 * If the CPU connects to this switch, set the switch tree
	 * tagging protocol to the preferred tagging format of this
	 * switch.
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	 */
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	if (dst->cpu_switch == index) {
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		switch (ds->tag_protocol) {
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#ifdef CONFIG_NET_DSA_TAG_DSA
		case DSA_TAG_PROTO_DSA:
			dst->rcv = dsa_netdev_ops.rcv;
			break;
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
		case DSA_TAG_PROTO_EDSA:
			dst->rcv = edsa_netdev_ops.rcv;
			break;
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
		case DSA_TAG_PROTO_TRAILER:
			dst->rcv = trailer_netdev_ops.rcv;
			break;
#endif
#ifdef CONFIG_NET_DSA_TAG_BRCM
		case DSA_TAG_PROTO_BRCM:
			dst->rcv = brcm_netdev_ops.rcv;
			break;
#endif
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		case DSA_TAG_PROTO_NONE:
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			break;
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		default:
			ret = -ENOPROTOOPT;
			goto out;
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		}
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		dst->tag_protocol = ds->tag_protocol;
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	}
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	/*
	 * Do basic register setup.
	 */
	ret = drv->setup(ds);
	if (ret < 0)
		goto out;

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	ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
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	if (ret < 0)
		goto out;

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	ds->slave_mii_bus = devm_mdiobus_alloc(parent);
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	if (ds->slave_mii_bus == NULL) {
		ret = -ENOMEM;
		goto out;
	}
	dsa_slave_mii_bus_init(ds);

	ret = mdiobus_register(ds->slave_mii_bus);
	if (ret < 0)
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		goto out;
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	/*
	 * Create network devices for physical switch ports.
	 */
	for (i = 0; i < DSA_MAX_PORTS; i++) {
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		if (!(ds->phys_port_mask & (1 << i)))
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			continue;

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

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	/* Perform configuration of the CPU and DSA ports */
	ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
	if (ret < 0) {
		netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
			   index);
		ret = 0;
	}

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#ifdef CONFIG_NET_DSA_HWMON
	/* If the switch provides a temperature sensor,
	 * register with hardware monitoring subsystem.
	 * Treat registration error as non-fatal and ignore it.
	 */
	if (drv->get_temp) {
		const char *netname = netdev_name(dst->master_netdev);
		char hname[IFNAMSIZ + 1];
		int i, j;

		/* Create valid hwmon 'name' attribute */
		for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
			if (isalnum(netname[i]))
				hname[j++] = netname[i];
		}
		hname[j] = '\0';
		scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
			  hname, index);
		ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
					ds->hwmon_name, ds, dsa_hwmon_groups);
		if (IS_ERR(ds->hwmon_dev))
			ds->hwmon_dev = NULL;
	}
#endif /* CONFIG_NET_DSA_HWMON */

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	return ret;
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out:
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	return ret;
}

static struct dsa_switch *
dsa_switch_setup(struct dsa_switch_tree *dst, int index,
		 struct device *parent, struct device *host_dev)
{
	struct dsa_chip_data *pd = dst->pd->chip + index;
	struct dsa_switch_driver *drv;
	struct dsa_switch *ds;
	int ret;
	char *name;

	/*
	 * Probe for switch model.
	 */
	drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
	if (drv == NULL) {
		netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
			   index);
		return ERR_PTR(-EINVAL);
	}
	netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
		    index, name);


	/*
	 * Allocate and initialise switch state.
	 */
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	ds = devm_kzalloc(parent, sizeof(*ds) + drv->priv_size, GFP_KERNEL);
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	if (ds == NULL)
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		return ERR_PTR(-ENOMEM);
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	ds->dst = dst;
	ds->index = index;
	ds->pd = pd;
	ds->drv = drv;
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	ds->tag_protocol = drv->tag_protocol;
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	ds->master_dev = host_dev;

	ret = dsa_switch_setup_one(ds, parent);
	if (ret)
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		return ERR_PTR(ret);
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	return ds;
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}

static void dsa_switch_destroy(struct dsa_switch *ds)
{
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	struct device_node *port_dn;
	struct phy_device *phydev;
	struct dsa_chip_data *cd = ds->pd;
	int port;

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#ifdef CONFIG_NET_DSA_HWMON
	if (ds->hwmon_dev)
		hwmon_device_unregister(ds->hwmon_dev);
#endif
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	/* Disable configuration of the CPU and DSA ports */
	for (port = 0; port < DSA_MAX_PORTS; port++) {
		if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
			continue;

		port_dn = cd->port_dn[port];
		if (of_phy_is_fixed_link(port_dn)) {
			phydev = of_phy_find_device(port_dn);
			if (phydev) {
				int addr = phydev->addr;

				phy_device_free(phydev);
				of_node_put(port_dn);
				fixed_phy_del(addr);
			}
		}
	}

	/* Destroy network devices for physical switch ports. */
	for (port = 0; port < DSA_MAX_PORTS; port++) {
		if (!(ds->phys_port_mask & (1 << port)))
			continue;

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

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

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	mdiobus_unregister(ds->slave_mii_bus);
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}

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#ifdef CONFIG_PM_SLEEP
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static int dsa_switch_suspend(struct dsa_switch *ds)
{
	int i, ret = 0;

	/* Suspend slave network devices */
	for (i = 0; i < DSA_MAX_PORTS; i++) {
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		if (!dsa_is_port_initialized(ds, i))
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			continue;

		ret = dsa_slave_suspend(ds->ports[i]);
		if (ret)
			return ret;
	}

	if (ds->drv->suspend)
		ret = ds->drv->suspend(ds);

	return ret;
}

static int dsa_switch_resume(struct dsa_switch *ds)
{
	int i, ret = 0;

	if (ds->drv->resume)
		ret = ds->drv->resume(ds);

	if (ret)
		return ret;

	/* Resume slave network devices */
	for (i = 0; i < DSA_MAX_PORTS; i++) {
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		if (!dsa_is_port_initialized(ds, i))
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			continue;

		ret = dsa_slave_resume(ds->ports[i]);
		if (ret)
			return ret;
	}

	return 0;
}
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#endif
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/* 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);
}

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struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
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{
	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;
}
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EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
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static struct net_device *dev_to_net_device(struct device *dev)
{
	struct device *d;

	d = dev_find_class(dev, "net");
	if (d != NULL) {
		struct net_device *nd;

		nd = to_net_dev(d);
		dev_hold(nd);
		put_device(d);

		return nd;
	}

	return NULL;
}

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#ifdef CONFIG_OF
static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
					struct dsa_chip_data *cd,
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					int chip_index, int port_index,
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					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;

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

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

	/* First time routing table allocation */
	if (!cd->rtable) {
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		cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
					   GFP_KERNEL);
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		if (!cd->rtable)
			return -ENOMEM;

		/* default to no valid uplink/downlink */
		memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
	}

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	cd->rtable[link_sw_addr] = port_index;
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	return 0;
}

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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;
}

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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;
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		while (port_index < DSA_MAX_PORTS) {
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			kfree(pd->chip[i].port_names[port_index]);
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			port_index++;
		}
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		kfree(pd->chip[i].rtable);
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		/* Drop our reference to the MDIO bus device */
		if (pd->chip[i].host_dev)
			put_device(pd->chip[i].host_dev);
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	}
	kfree(pd->chip);
}

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static int dsa_of_probe(struct device *dev)
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{
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	struct device_node *np = dev->of_node;
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	struct device_node *child, *mdio, *ethernet, *port;
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	struct mii_bus *mdio_bus, *mdio_bus_switch;
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	struct net_device *ethernet_dev;
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	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;
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	int gpio;
	enum of_gpio_flags of_flags;
	unsigned long flags;
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	u32 eeprom_len;
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	int ret;
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	mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
	if (!mdio)
		return -EINVAL;

	mdio_bus = of_mdio_find_bus(mdio);
	if (!mdio_bus)
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		return -EPROBE_DEFER;
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	ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
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	if (!ethernet) {
		ret = -EINVAL;
		goto out_put_mdio;
	}
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	ethernet_dev = of_find_net_device_by_node(ethernet);
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	if (!ethernet_dev) {
		ret = -EPROBE_DEFER;
		goto out_put_mdio;
	}
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	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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	if (!pd) {
		ret = -ENOMEM;
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		goto out_put_ethernet;
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	}
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	dev->platform_data = pd;
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	pd->of_netdev = ethernet_dev;
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	pd->nr_chips = of_get_available_child_count(np);
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	if (pd->nr_chips > DSA_MAX_SWITCHES)
		pd->nr_chips = DSA_MAX_SWITCHES;

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	pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
			   GFP_KERNEL);
705 706 707 708 709
	if (!pd->chip) {
		ret = -ENOMEM;
		goto out_free;
	}

710
	chip_index = -1;
711
	for_each_available_child_of_node(np, child) {
712
		chip_index++;
713 714
		cd = &pd->chip[chip_index];

715
		cd->of_node = child;
716 717 718

		/* When assigning the host device, increment its refcount */
		cd->host_dev = get_device(&mdio_bus->dev);
719 720 721 722 723 724

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

		cd->sw_addr = be32_to_cpup(sw_addr);
725
		if (cd->sw_addr >= PHY_MAX_ADDR)
726 727
			continue;

728
		if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
729 730
			cd->eeprom_len = eeprom_len;

A
Andrew Lunn 已提交
731 732 733 734 735 736 737
		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;
			}
738 739 740 741 742 743

			/* 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);
A
Andrew Lunn 已提交
744 745
			cd->host_dev = &mdio_bus_switch->dev;
		}
746 747 748 749 750 751 752 753 754 755 756 757 758
		gpio = of_get_named_gpio_flags(child, "reset-gpios", 0,
					       &of_flags);
		if (gpio_is_valid(gpio)) {
			flags = (of_flags == OF_GPIO_ACTIVE_LOW ?
				 GPIOF_ACTIVE_LOW : 0);
			ret = devm_gpio_request_one(dev, gpio, flags,
						    "switch_reset");
			if (ret)
				goto out_free_chip;

			cd->reset = gpio_to_desc(gpio);
			gpiod_direction_output(cd->reset, 0);
		}
A
Andrew Lunn 已提交
759

760 761 762 763 764 765
		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);
766 767
			if (port_index >= DSA_MAX_PORTS)
				break;
768 769 770 771 772

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

773 774
			cd->port_dn[port_index] = port;

775 776 777 778 779 780 781
			cd->port_names[port_index] = kstrdup(port_name,
					GFP_KERNEL);
			if (!cd->port_names[port_index]) {
				ret = -ENOMEM;
				goto out_free_chip;
			}

782 783 784 785
			ret = dsa_of_probe_links(pd, cd, chip_index,
						 port_index, port, port_name);
			if (ret)
				goto out_free_chip;
786 787 788 789

		}
	}

790 791 792 793
	/* The individual chips hold their own refcount on the mdio bus,
	 * so drop ours */
	put_device(&mdio_bus->dev);

794 795 796
	return 0;

out_free_chip:
797
	dsa_of_free_platform_data(pd);
798 799
out_free:
	kfree(pd);
800
	dev->platform_data = NULL;
R
Russell King 已提交
801 802
out_put_ethernet:
	put_device(&ethernet_dev->dev);
803 804
out_put_mdio:
	put_device(&mdio_bus->dev);
805 806 807
	return ret;
}

808
static void dsa_of_remove(struct device *dev)
809
{
810
	struct dsa_platform_data *pd = dev->platform_data;
811

812
	if (!dev->of_node)
813 814
		return;

815
	dsa_of_free_platform_data(pd);
R
Russell King 已提交
816
	put_device(&pd->of_netdev->dev);
817 818 819
	kfree(pd);
}
#else
820
static inline int dsa_of_probe(struct device *dev)
821 822 823 824
{
	return 0;
}

825
static inline void dsa_of_remove(struct device *dev)
826 827 828 829
{
}
#endif

830 831
static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
			 struct device *parent, struct dsa_platform_data *pd)
832 833
{
	int i;
834
	unsigned configured = 0;
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851

	dst->pd = pd;
	dst->master_netdev = dev;
	dst->cpu_switch = -1;
	dst->cpu_port = -1;

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

		ds = dsa_switch_setup(dst, 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;
852 853

		++configured;
854 855
	}

856 857 858 859 860 861
	/*
	 * If no switch was found, exit cleanly
	 */
	if (!configured)
		return -EPROBE_DEFER;

862 863 864 865 866 867 868 869
	/*
	 * If we use a tagging format that doesn't have an ethertype
	 * field, make sure that all packets from this point on get
	 * sent to the tag format's receive function.
	 */
	wmb();
	dev->dsa_ptr = (void *)dst;

870
	return 0;
871 872
}

873 874 875 876
static int dsa_probe(struct platform_device *pdev)
{
	struct dsa_platform_data *pd = pdev->dev.platform_data;
	struct net_device *dev;
877
	struct dsa_switch_tree *dst;
878
	int ret;
879

880 881
	pr_notice_once("Distributed Switch Architecture driver version %s\n",
		       dsa_driver_version);
882

883
	if (pdev->dev.of_node) {
884
		ret = dsa_of_probe(&pdev->dev);
885 886 887 888 889 890
		if (ret)
			return ret;

		pd = pdev->dev.platform_data;
	}

891
	if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
892 893
		return -EINVAL;

894 895 896 897 898 899
	if (pd->of_netdev) {
		dev = pd->of_netdev;
		dev_hold(dev);
	} else {
		dev = dev_to_net_device(pd->netdev);
	}
900
	if (dev == NULL) {
901
		ret = -EPROBE_DEFER;
902 903
		goto out;
	}
904 905 906

	if (dev->dsa_ptr != NULL) {
		dev_put(dev);
907 908
		ret = -EEXIST;
		goto out;
909 910
	}

911
	dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
912
	if (dst == NULL) {
913
		dev_put(dev);
914 915
		ret = -ENOMEM;
		goto out;
916 917
	}

918 919
	platform_set_drvdata(pdev, dst);

920
	ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
921 922
	if (ret) {
		dev_put(dev);
923
		goto out;
924
	}
925 926

	return 0;
927 928

out:
929
	dsa_of_remove(&pdev->dev);
930 931

	return ret;
932 933
}

934
static void dsa_remove_dst(struct dsa_switch_tree *dst)
935
{
936
	int i;
937

938 939 940
	for (i = 0; i < dst->pd->nr_chips; i++) {
		struct dsa_switch *ds = dst->ds[i];

941
		if (ds)
942 943
			dsa_switch_destroy(ds);
	}
944 945

	dev_put(dst->master_netdev);
946 947 948 949 950
}

static int dsa_remove(struct platform_device *pdev)
{
	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
951

952
	dsa_remove_dst(dst);
953
	dsa_of_remove(&pdev->dev);
954

955 956 957 958 959 960 961
	return 0;
}

static void dsa_shutdown(struct platform_device *pdev)
{
}

962 963 964 965 966 967 968 969 970 971
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
			  struct packet_type *pt, struct net_device *orig_dev)
{
	struct dsa_switch_tree *dst = dev->dsa_ptr;

	if (unlikely(dst == NULL)) {
		kfree_skb(skb);
		return 0;
	}

972
	return dst->rcv(skb, dev, pt, orig_dev);
973 974
}

975
static struct packet_type dsa_pack_type __read_mostly = {
976 977 978 979
	.type	= cpu_to_be16(ETH_P_XDSA),
	.func	= dsa_switch_rcv,
};

980 981 982 983
static struct notifier_block dsa_netdevice_nb __read_mostly = {
	.notifier_call	= dsa_slave_netdevice_event,
};

984 985 986 987 988 989 990
#ifdef CONFIG_PM_SLEEP
static int dsa_suspend(struct device *d)
{
	struct platform_device *pdev = to_platform_device(d);
	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
	int i, ret = 0;

991 992 993 994 995 996 997 998
	dst->master_netdev->dsa_ptr = NULL;

	/* If we used a tagging format that doesn't have an ethertype
	 * field, make sure that all packets from this point get sent
	 * without the tag and go through the regular receive path.
	 */
	wmb();

999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
	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 platform_device *pdev = to_platform_device(d);
	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
	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);

1028
static const struct of_device_id dsa_of_match_table[] = {
1029
	{ .compatible = "brcm,bcm7445-switch-v4.0" },
1030 1031 1032 1033 1034
	{ .compatible = "marvell,dsa", },
	{}
};
MODULE_DEVICE_TABLE(of, dsa_of_match_table);

1035 1036 1037 1038 1039 1040
static struct platform_driver dsa_driver = {
	.probe		= dsa_probe,
	.remove		= dsa_remove,
	.shutdown	= dsa_shutdown,
	.driver = {
		.name	= "dsa",
1041
		.of_match_table = dsa_of_match_table,
1042
		.pm	= &dsa_pm_ops,
1043 1044 1045 1046 1047
	},
};

static int __init dsa_init_module(void)
{
B
Ben Hutchings 已提交
1048 1049
	int rc;

1050 1051
	register_netdevice_notifier(&dsa_netdevice_nb);

B
Ben Hutchings 已提交
1052 1053 1054 1055
	rc = platform_driver_register(&dsa_driver);
	if (rc)
		return rc;

1056 1057
	dev_add_pack(&dsa_pack_type);

B
Ben Hutchings 已提交
1058
	return 0;
1059 1060 1061 1062 1063
}
module_init(dsa_init_module);

static void __exit dsa_cleanup_module(void)
{
1064
	unregister_netdevice_notifier(&dsa_netdevice_nb);
1065
	dev_remove_pack(&dsa_pack_type);
1066 1067 1068 1069
	platform_driver_unregister(&dsa_driver);
}
module_exit(dsa_cleanup_module);

1070
MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1071 1072 1073
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");