1 files changed, 392 insertions, 0 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
new file mode 100644
index 000000000000..33e99462023a
--- /dev/null
+++ b/net/dsa/dsa.c
@@ -0,0 +1,392 @@
+/*
+ * net/dsa/dsa.c - Hardware switch handling
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <net/dsa.h>
+#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);
+}
+
+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);
+}
+
+static struct dsa_switch_driver *
+dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
+{
+	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);
+
+		name = drv->probe(bus, sw_addr);
+		if (name != NULL) {
+			ret = drv;
+			break;
+		}
+	}
+	mutex_unlock(&dsa_switch_drivers_mutex);
+
+	*_name = name;
+
+	return ret;
+}
+
+
+/* basic switch operations **************************************************/
+static struct dsa_switch *
+dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd,
+		 struct mii_bus *bus, struct net_device *dev)
+{
+	struct dsa_switch *ds;
+	int ret;
+	struct dsa_switch_driver *drv;
+	char *name;
+	int i;
+
+	/*
+	 * Probe for switch model.
+	 */
+	drv = dsa_switch_probe(bus, pd->sw_addr, &name);
+	if (drv == NULL) {
+		printk(KERN_ERR "%s: could not detect attached switch\n",
+		       dev->name);
+		return ERR_PTR(-EINVAL);
+	}
+	printk(KERN_INFO "%s: detected a %s switch\n", dev->name, name);
+
+
+	/*
+	 * Allocate and initialise switch state.
+	 */
+	ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
+	if (ds == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	ds->pd = pd;
+	ds->master_netdev = dev;
+	ds->master_mii_bus = bus;
+
+	ds->drv = drv;
+	ds->tag_protocol = drv->tag_protocol;
+
+
+	/*
+	 * Validate supplied switch configuration.
+	 */
+	ds->cpu_port = -1;
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		char *name;
+
+		name = pd->port_names[i];
+		if (name == NULL)
+			continue;
+
+		if (!strcmp(name, "cpu")) {
+			if (ds->cpu_port != -1) {
+				printk(KERN_ERR "multiple cpu ports?!\n");
+				ret = -EINVAL;
+				goto out;
+			}
+			ds->cpu_port = i;
+		} else {
+			ds->valid_port_mask |= 1 << i;
+		}
+	}
+
+	if (ds->cpu_port == -1) {
+		printk(KERN_ERR "no cpu port?!\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+
+	/*
+	 * 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.  (Which will
+	 * discard received packets until we set ds->ports[] below.)
+	 */
+	wmb();
+	dev->dsa_ptr = (void *)ds;
+
+
+	/*
+	 * Do basic register setup.
+	 */
+	ret = drv->setup(ds);
+	if (ret < 0)
+		goto out;
+
+	ret = drv->set_addr(ds, dev->dev_addr);
+	if (ret < 0)
+		goto out;
+
+	ds->slave_mii_bus = mdiobus_alloc();
+	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)
+		goto out_free;
+
+
+	/*
+	 * Create network devices for physical switch ports.
+	 */
+	wmb();
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		struct net_device *slave_dev;
+
+		if (!(ds->valid_port_mask & (1 << i)))
+			continue;
+
+		slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
+		if (slave_dev == NULL) {
+			printk(KERN_ERR "%s: can't create dsa slave "
+			       "device for port %d(%s)\n",
+			       dev->name, i, pd->port_names[i]);
+			continue;
+		}
+
+		ds->ports[i] = slave_dev;
+	}
+
+	return ds;
+
+out_free:
+	mdiobus_free(ds->slave_mii_bus);
+out:
+	dev->dsa_ptr = NULL;
+	kfree(ds);
+	return ERR_PTR(ret);
+}
+
+static void dsa_switch_destroy(struct dsa_switch *ds)
+{
+}
+
+
+/* hooks for ethertype-less tagging formats *********************************/
+/*
+ * The original DSA tag format and some other tag formats have no
+ * ethertype, which means that we need to add a little hack to the
+ * networking receive path to make sure that received frames get
+ * the right ->protocol assigned to them when one of those tag
+ * formats is in use.
+ */
+bool dsa_uses_dsa_tags(void *dsa_ptr)
+{
+	struct dsa_switch *ds = dsa_ptr;
+
+	return !!(ds->tag_protocol == htons(ETH_P_DSA));
+}
+
+bool dsa_uses_trailer_tags(void *dsa_ptr)
+{
+	struct dsa_switch *ds = dsa_ptr;
+
+	return !!(ds->tag_protocol == htons(ETH_P_TRAILER));
+}
+
+
+/* link polling *************************************************************/
+static void dsa_link_poll_work(struct work_struct *ugly)
+{
+	struct dsa_switch *ds;
+
+	ds = container_of(ugly, struct dsa_switch, link_poll_work);
+
+	ds->drv->poll_link(ds);
+	mod_timer(&ds->link_poll_timer, round_jiffies(jiffies + HZ));
+}
+
+static void dsa_link_poll_timer(unsigned long _ds)
+{
+	struct dsa_switch *ds = (void *)_ds;
+
+	schedule_work(&ds->link_poll_work);
+}
+
+
+/* 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);
+}
+
+static struct mii_bus *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;
+}
+
+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;
+}
+
+static int dsa_probe(struct platform_device *pdev)
+{
+	static int dsa_version_printed;
+	struct dsa_platform_data *pd = pdev->dev.platform_data;
+	struct net_device *dev;
+	struct mii_bus *bus;
+	struct dsa_switch *ds;
+
+	if (!dsa_version_printed++)
+		printk(KERN_NOTICE "Distributed Switch Architecture "
+			"driver version %s\n", dsa_driver_version);
+
+	if (pd == NULL || pd->mii_bus == NULL || pd->netdev == NULL)
+		return -EINVAL;
+
+	bus = dev_to_mii_bus(pd->mii_bus);
+	if (bus == NULL)
+		return -EINVAL;
+
+	dev = dev_to_net_device(pd->netdev);
+	if (dev == NULL)
+		return -EINVAL;
+
+	if (dev->dsa_ptr != NULL) {
+		dev_put(dev);
+		return -EEXIST;
+	}
+
+	ds = dsa_switch_setup(&pdev->dev, pd, bus, dev);
+	if (IS_ERR(ds)) {
+		dev_put(dev);
+		return PTR_ERR(ds);
+	}
+
+	if (ds->drv->poll_link != NULL) {
+		INIT_WORK(&ds->link_poll_work, dsa_link_poll_work);
+		init_timer(&ds->link_poll_timer);
+		ds->link_poll_timer.data = (unsigned long)ds;
+		ds->link_poll_timer.function = dsa_link_poll_timer;
+		ds->link_poll_timer.expires = round_jiffies(jiffies + HZ);
+		add_timer(&ds->link_poll_timer);
+	}
+
+	platform_set_drvdata(pdev, ds);
+
+	return 0;
+}
+
+static int dsa_remove(struct platform_device *pdev)
+{
+	struct dsa_switch *ds = platform_get_drvdata(pdev);
+
+	if (ds->drv->poll_link != NULL)
+		del_timer_sync(&ds->link_poll_timer);
+
+	flush_scheduled_work();
+
+	dsa_switch_destroy(ds);
+
+	return 0;
+}
+
+static void dsa_shutdown(struct platform_device *pdev)
+{
+}
+
+static struct platform_driver dsa_driver = {
+	.probe		= dsa_probe,
+	.remove		= dsa_remove,
+	.shutdown	= dsa_shutdown,
+	.driver = {
+		.name	= "dsa",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init dsa_init_module(void)
+{
+	return platform_driver_register(&dsa_driver);
+}
+module_init(dsa_init_module);
+
+static void __exit dsa_cleanup_module(void)
+{
+	platform_driver_unregister(&dsa_driver);
+}
+module_exit(dsa_cleanup_module);
+
+MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>")
+MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dsa");