dsa.c 23.8 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;

		unregister_netdev(ds->ports[port]);
		free_netdev(ds->ports[port]);
	}

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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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/* link polling *************************************************************/
static void dsa_link_poll_work(struct work_struct *ugly)
{
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	struct dsa_switch_tree *dst;
	int i;

	dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
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	for (i = 0; i < dst->pd->nr_chips; i++) {
		struct dsa_switch *ds = dst->ds[i];
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		if (ds != NULL && ds->drv->poll_link != NULL)
			ds->drv->poll_link(ds);
	}

	mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
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}

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static void dsa_link_poll_timer(unsigned long _dst)
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{
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	struct dsa_switch_tree *dst = (void *)_dst;
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	schedule_work(&dst->link_poll_work);
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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;
	}
712

713
	ethernet_dev = of_find_net_device_by_node(ethernet);
714 715 716 717
	if (!ethernet_dev) {
		ret = -EPROBE_DEFER;
		goto out_put_mdio;
	}
718 719

	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
720 721
	if (!pd) {
		ret = -ENOMEM;
R
Russell King 已提交
722
		goto out_put_ethernet;
723
	}
724

725
	dev->platform_data = pd;
726
	pd->of_netdev = ethernet_dev;
727
	pd->nr_chips = of_get_available_child_count(np);
728 729 730
	if (pd->nr_chips > DSA_MAX_SWITCHES)
		pd->nr_chips = DSA_MAX_SWITCHES;

731 732
	pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
			   GFP_KERNEL);
733 734 735 736 737
	if (!pd->chip) {
		ret = -ENOMEM;
		goto out_free;
	}

738
	chip_index = -1;
739
	for_each_available_child_of_node(np, child) {
740
		chip_index++;
741 742
		cd = &pd->chip[chip_index];

743
		cd->of_node = child;
744 745 746

		/* When assigning the host device, increment its refcount */
		cd->host_dev = get_device(&mdio_bus->dev);
747 748 749 750 751 752

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

		cd->sw_addr = be32_to_cpup(sw_addr);
753
		if (cd->sw_addr >= PHY_MAX_ADDR)
754 755
			continue;

756
		if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
757 758
			cd->eeprom_len = eeprom_len;

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Andrew Lunn 已提交
759 760 761 762 763 764 765
		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;
			}
766 767 768 769 770 771

			/* 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);
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772 773
			cd->host_dev = &mdio_bus_switch->dev;
		}
774 775 776 777 778 779 780 781 782 783 784 785 786
		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
787

788 789 790 791 792 793
		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);
794 795
			if (port_index >= DSA_MAX_PORTS)
				break;
796 797 798 799 800

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

801 802
			cd->port_dn[port_index] = port;

803 804 805 806 807 808 809
			cd->port_names[port_index] = kstrdup(port_name,
					GFP_KERNEL);
			if (!cd->port_names[port_index]) {
				ret = -ENOMEM;
				goto out_free_chip;
			}

810 811 812 813
			ret = dsa_of_probe_links(pd, cd, chip_index,
						 port_index, port, port_name);
			if (ret)
				goto out_free_chip;
814 815 816 817

		}
	}

818 819 820 821
	/* The individual chips hold their own refcount on the mdio bus,
	 * so drop ours */
	put_device(&mdio_bus->dev);

822 823 824
	return 0;

out_free_chip:
825
	dsa_of_free_platform_data(pd);
826 827
out_free:
	kfree(pd);
828
	dev->platform_data = NULL;
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Russell King 已提交
829 830
out_put_ethernet:
	put_device(&ethernet_dev->dev);
831 832
out_put_mdio:
	put_device(&mdio_bus->dev);
833 834 835
	return ret;
}

836
static void dsa_of_remove(struct device *dev)
837
{
838
	struct dsa_platform_data *pd = dev->platform_data;
839

840
	if (!dev->of_node)
841 842
		return;

843
	dsa_of_free_platform_data(pd);
R
Russell King 已提交
844
	put_device(&pd->of_netdev->dev);
845 846 847
	kfree(pd);
}
#else
848
static inline int dsa_of_probe(struct device *dev)
849 850 851 852
{
	return 0;
}

853
static inline void dsa_of_remove(struct device *dev)
854 855 856 857
{
}
#endif

858 859
static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
			 struct device *parent, struct dsa_platform_data *pd)
860 861
{
	int i;
862
	unsigned configured = 0;
863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881

	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;
		if (ds->drv->poll_link != NULL)
			dst->link_poll_needed = 1;
882 883

		++configured;
884 885
	}

886 887 888 889 890 891
	/*
	 * If no switch was found, exit cleanly
	 */
	if (!configured)
		return -EPROBE_DEFER;

892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
	/*
	 * 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;

	if (dst->link_poll_needed) {
		INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
		init_timer(&dst->link_poll_timer);
		dst->link_poll_timer.data = (unsigned long)dst;
		dst->link_poll_timer.function = dsa_link_poll_timer;
		dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
		add_timer(&dst->link_poll_timer);
	}
908 909

	return 0;
910 911
}

912 913 914 915
static int dsa_probe(struct platform_device *pdev)
{
	struct dsa_platform_data *pd = pdev->dev.platform_data;
	struct net_device *dev;
916
	struct dsa_switch_tree *dst;
917
	int ret;
918

919 920
	pr_notice_once("Distributed Switch Architecture driver version %s\n",
		       dsa_driver_version);
921

922
	if (pdev->dev.of_node) {
923
		ret = dsa_of_probe(&pdev->dev);
924 925 926 927 928 929
		if (ret)
			return ret;

		pd = pdev->dev.platform_data;
	}

930
	if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
931 932
		return -EINVAL;

933 934 935 936 937 938
	if (pd->of_netdev) {
		dev = pd->of_netdev;
		dev_hold(dev);
	} else {
		dev = dev_to_net_device(pd->netdev);
	}
939
	if (dev == NULL) {
940
		ret = -EPROBE_DEFER;
941 942
		goto out;
	}
943 944 945

	if (dev->dsa_ptr != NULL) {
		dev_put(dev);
946 947
		ret = -EEXIST;
		goto out;
948 949
	}

950
	dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
951
	if (dst == NULL) {
952
		dev_put(dev);
953 954
		ret = -ENOMEM;
		goto out;
955 956
	}

957 958
	platform_set_drvdata(pdev, dst);

959 960 961
	ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
	if (ret)
		goto out;
962 963

	return 0;
964 965

out:
966
	dsa_of_remove(&pdev->dev);
967 968

	return ret;
969 970
}

971
static void dsa_remove_dst(struct dsa_switch_tree *dst)
972
{
973
	int i;
974

975 976
	if (dst->link_poll_needed)
		del_timer_sync(&dst->link_poll_timer);
977

978
	flush_work(&dst->link_poll_work);
979

980 981 982
	for (i = 0; i < dst->pd->nr_chips; i++) {
		struct dsa_switch *ds = dst->ds[i];

983
		if (ds)
984 985
			dsa_switch_destroy(ds);
	}
986 987 988 989 990
}

static int dsa_remove(struct platform_device *pdev)
{
	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
991

992
	dsa_remove_dst(dst);
993
	dsa_of_remove(&pdev->dev);
994

995 996 997 998 999 1000 1001
	return 0;
}

static void dsa_shutdown(struct platform_device *pdev)
{
}

1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
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;
	}

1012
	return dst->rcv(skb, dev, pt, orig_dev);
1013 1014
}

1015
static struct packet_type dsa_pack_type __read_mostly = {
1016 1017 1018 1019
	.type	= cpu_to_be16(ETH_P_XDSA),
	.func	= dsa_switch_rcv,
};

1020 1021 1022 1023
static struct notifier_block dsa_netdevice_nb __read_mostly = {
	.notifier_call	= dsa_slave_netdevice_event,
};

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
#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;

	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);

1060
static const struct of_device_id dsa_of_match_table[] = {
1061
	{ .compatible = "brcm,bcm7445-switch-v4.0" },
1062 1063 1064 1065 1066
	{ .compatible = "marvell,dsa", },
	{}
};
MODULE_DEVICE_TABLE(of, dsa_of_match_table);

1067 1068 1069 1070 1071 1072
static struct platform_driver dsa_driver = {
	.probe		= dsa_probe,
	.remove		= dsa_remove,
	.shutdown	= dsa_shutdown,
	.driver = {
		.name	= "dsa",
1073
		.of_match_table = dsa_of_match_table,
1074
		.pm	= &dsa_pm_ops,
1075 1076 1077 1078 1079
	},
};

static int __init dsa_init_module(void)
{
B
Ben Hutchings 已提交
1080 1081
	int rc;

1082 1083
	register_netdevice_notifier(&dsa_netdevice_nb);

B
Ben Hutchings 已提交
1084 1085 1086 1087
	rc = platform_driver_register(&dsa_driver);
	if (rc)
		return rc;

1088 1089
	dev_add_pack(&dsa_pack_type);

B
Ben Hutchings 已提交
1090
	return 0;
1091 1092 1093 1094 1095
}
module_init(dsa_init_module);

static void __exit dsa_cleanup_module(void)
{
1096
	unregister_netdevice_notifier(&dsa_netdevice_nb);
1097
	dev_remove_pack(&dsa_pack_type);
1098 1099 1100 1101
	platform_driver_unregister(&dsa_driver);
}
module_exit(dsa_cleanup_module);

1102
MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1103 1104 1105
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");