1 files changed, 365 insertions, 89 deletions

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 33e99462023..5db37cef50a 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -1,6 +1,7 @@
 /*
  * net/dsa/dsa.c - Hardware switch handling
- * Copyright (c) 2008 Marvell Semiconductor
+ * 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
@@ -11,7 +12,12 @@
 #include <linux/list.h>
 #include <linux/netdevice.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/module.h>
 #include <net/dsa.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
 #include "dsa_priv.h"
 
 char dsa_driver_version[] = "0.1";
@@ -27,6 +33,7 @@ void register_switch_driver(struct dsa_switch_driver *drv)
 	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)
 {
@@ -34,6 +41,7 @@ void unregister_switch_driver(struct dsa_switch_driver *drv)
 	list_del_init(&drv->list);
 	mutex_unlock(&dsa_switch_drivers_mutex);
 }
+EXPORT_SYMBOL_GPL(unregister_switch_driver);
 
 static struct dsa_switch_driver *
 dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
@@ -67,25 +75,28 @@ dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
 
 /* 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)
+dsa_switch_setup(struct dsa_switch_tree *dst, int index,
+		 struct device *parent, struct mii_bus *bus)
 {
+	struct dsa_chip_data *pd = dst->pd->chip + index;
+	struct dsa_switch_driver *drv;
 	struct dsa_switch *ds;
 	int ret;
-	struct dsa_switch_driver *drv;
 	char *name;
 	int i;
+	bool valid_name_found = false;
 
 	/*
 	 * 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);
+		printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
+		       dst->master_netdev->name, index);
 		return ERR_PTR(-EINVAL);
 	}
-	printk(KERN_INFO "%s: detected a %s switch\n", dev->name, name);
+	printk(KERN_INFO "%s[%d]: detected a %s switch\n",
+		dst->master_netdev->name, index, name);
 
 
 	/*
@@ -95,18 +106,16 @@ dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd,
 	if (ds == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	ds->pd = pd;
-	ds->master_netdev = dev;
-	ds->master_mii_bus = bus;
-
+	ds->dst = dst;
+	ds->index = index;
+	ds->pd = dst->pd->chip + index;
 	ds->drv = drv;
-	ds->tag_protocol = drv->tag_protocol;
+	ds->master_mii_bus = bus;
 
 
 	/*
 	 * Validate supplied switch configuration.
 	 */
-	ds->cpu_port = -1;
 	for (i = 0; i < DSA_MAX_PORTS; i++) {
 		char *name;
 
@@ -115,32 +124,33 @@ dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd,
 			continue;
 
 		if (!strcmp(name, "cpu")) {
-			if (ds->cpu_port != -1) {
+			if (dst->cpu_switch != -1) {
 				printk(KERN_ERR "multiple cpu ports?!\n");
 				ret = -EINVAL;
 				goto out;
 			}
-			ds->cpu_port = i;
+			dst->cpu_switch = index;
+			dst->cpu_port = i;
+		} else if (!strcmp(name, "dsa")) {
+			ds->dsa_port_mask |= 1 << i;
 		} else {
-			ds->valid_port_mask |= 1 << i;
+			ds->phys_port_mask |= 1 << i;
 		}
+		valid_name_found = true;
 	}
 
-	if (ds->cpu_port == -1) {
-		printk(KERN_ERR "no cpu port?!\n");
+	if (!valid_name_found && i == DSA_MAX_PORTS) {
 		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.)
+	 * If the CPU connects to this switch, set the switch tree
+	 * tagging protocol to the preferred tagging format of this
+	 * switch.
 	 */
-	wmb();
-	dev->dsa_ptr = (void *)ds;
+	if (ds->dst->cpu_switch == index)
+		ds->dst->tag_protocol = drv->tag_protocol;
 
 
 	/*
@@ -150,7 +160,7 @@ dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd,
 	if (ret < 0)
 		goto out;
 
-	ret = drv->set_addr(ds, dev->dev_addr);
+	ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 	if (ret < 0)
 		goto out;
 
@@ -169,18 +179,18 @@ dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd,
 	/*
 	 * 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)))
+		if (!(ds->phys_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]);
+			printk(KERN_ERR "%s[%d]: can't create dsa "
+			       "slave device for port %d(%s)\n",
+			       dst->master_netdev->name,
+			       index, i, pd->port_names[i]);
 			continue;
 		}
 
@@ -192,7 +202,6 @@ dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd,
 out_free:
 	mdiobus_free(ds->slave_mii_bus);
 out:
-	dev->dsa_ptr = NULL;
 	kfree(ds);
 	return ERR_PTR(ret);
 }
@@ -202,45 +211,29 @@ 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;
+	struct dsa_switch_tree *dst;
+	int i;
 
-	ds = container_of(ugly, struct dsa_switch, link_poll_work);
+	dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 
-	ds->drv->poll_link(ds);
-	mod_timer(&ds->link_poll_timer, round_jiffies(jiffies + HZ));
+	for (i = 0; i < dst->pd->nr_chips; i++) {
+		struct dsa_switch *ds = dst->ds[i];
+
+		if (ds != NULL && ds->drv->poll_link != NULL)
+			ds->drv->poll_link(ds);
+	}
+
+	mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 }
 
-static void dsa_link_poll_timer(unsigned long _ds)
+static void dsa_link_poll_timer(unsigned long _dst)
 {
-	struct dsa_switch *ds = (void *)_ds;
+	struct dsa_switch_tree *dst = (void *)_dst;
 
-	schedule_work(&ds->link_poll_work);
+	schedule_work(&dst->link_poll_work);
 }
 
 
@@ -298,64 +291,316 @@ static struct net_device *dev_to_net_device(struct device *dev)
 	return NULL;
 }
 
+#ifdef CONFIG_OF
+static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
+					struct dsa_chip_data *cd,
+					int chip_index,
+					struct device_node *link)
+{
+	int ret;
+	const __be32 *reg;
+	int link_port_addr;
+	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;
+
+	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) {
+		cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
+		if (!cd->rtable)
+			return -ENOMEM;
+
+		/* default to no valid uplink/downlink */
+		memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
+	}
+
+	reg = of_get_property(link, "reg", NULL);
+	if (!reg) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	link_port_addr = be32_to_cpup(reg);
+
+	cd->rtable[link_sw_addr] = link_port_addr;
+
+	return 0;
+out:
+	kfree(cd->rtable);
+	return ret;
+}
+
+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) {
+			if (pd->chip[i].port_names[port_index])
+				kfree(pd->chip[i].port_names[port_index]);
+			port_index++;
+		}
+		kfree(pd->chip[i].rtable);
+	}
+	kfree(pd->chip);
+}
+
+static int dsa_of_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child, *mdio, *ethernet, *port, *link;
+	struct mii_bus *mdio_bus;
+	struct platform_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;
+	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 -EINVAL;
+
+	ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
+	if (!ethernet)
+		return -EINVAL;
+
+	ethernet_dev = of_find_device_by_node(ethernet);
+	if (!ethernet_dev)
+		return -ENODEV;
+
+	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+
+	pdev->dev.platform_data = pd;
+	pd->netdev = &ethernet_dev->dev;
+	pd->nr_chips = of_get_child_count(np);
+	if (pd->nr_chips > DSA_MAX_SWITCHES)
+		pd->nr_chips = DSA_MAX_SWITCHES;
+
+	pd->chip = kzalloc(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) {
+		chip_index++;
+		cd = &pd->chip[chip_index];
+
+		cd->mii_bus = &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;
+
+		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);
+
+			port_name = of_get_property(port, "label", NULL);
+			if (!port_name)
+				continue;
+
+			cd->port_names[port_index] = kstrdup(port_name,
+					GFP_KERNEL);
+			if (!cd->port_names[port_index]) {
+				ret = -ENOMEM;
+				goto out_free_chip;
+			}
+
+			link = of_parse_phandle(port, "link", 0);
+
+			if (!strcmp(port_name, "dsa") && link &&
+					pd->nr_chips > 1) {
+				ret = dsa_of_setup_routing_table(pd, cd,
+						chip_index, link);
+				if (ret)
+					goto out_free_chip;
+			}
+
+			if (port_index == DSA_MAX_PORTS)
+				break;
+		}
+	}
+
+	return 0;
+
+out_free_chip:
+	dsa_of_free_platform_data(pd);
+out_free:
+	kfree(pd);
+	pdev->dev.platform_data = NULL;
+	return ret;
+}
+
+static void dsa_of_remove(struct platform_device *pdev)
+{
+	struct dsa_platform_data *pd = pdev->dev.platform_data;
+
+	if (!pdev->dev.of_node)
+		return;
+
+	dsa_of_free_platform_data(pd);
+	kfree(pd);
+}
+#else
+static inline int dsa_of_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static inline void dsa_of_remove(struct platform_device *pdev)
+{
+}
+#endif
+
 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;
+	struct dsa_switch_tree *dst;
+	int i, ret;
 
 	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;
+	if (pdev->dev.of_node) {
+		ret = dsa_of_probe(pdev);
+		if (ret)
+			return ret;
 
-	bus = dev_to_mii_bus(pd->mii_bus);
-	if (bus == NULL)
+		pd = pdev->dev.platform_data;
+	}
+
+	if (pd == NULL || pd->netdev == NULL)
 		return -EINVAL;
 
 	dev = dev_to_net_device(pd->netdev);
-	if (dev == NULL)
-		return -EINVAL;
+	if (dev == NULL) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	if (dev->dsa_ptr != NULL) {
 		dev_put(dev);
-		return -EEXIST;
+		ret = -EEXIST;
+		goto out;
 	}
 
-	ds = dsa_switch_setup(&pdev->dev, pd, bus, dev);
-	if (IS_ERR(ds)) {
+	dst = kzalloc(sizeof(*dst), GFP_KERNEL);
+	if (dst == NULL) {
 		dev_put(dev);
-		return PTR_ERR(ds);
+		ret = -ENOMEM;
+		goto out;
 	}
 
-	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, dst);
+
+	dst->pd = pd;
+	dst->master_netdev = dev;
+	dst->cpu_switch = -1;
+	dst->cpu_port = -1;
+
+	for (i = 0; i < pd->nr_chips; i++) {
+		struct mii_bus *bus;
+		struct dsa_switch *ds;
+
+		bus = dev_to_mii_bus(pd->chip[i].mii_bus);
+		if (bus == NULL) {
+			printk(KERN_ERR "%s[%d]: no mii bus found for "
+				"dsa switch\n", dev->name, i);
+			continue;
+		}
+
+		ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
+		if (IS_ERR(ds)) {
+			printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
+				"instance (error %ld)\n", dev->name, i,
+				PTR_ERR(ds));
+			continue;
+		}
+
+		dst->ds[i] = ds;
+		if (ds->drv->poll_link != NULL)
+			dst->link_poll_needed = 1;
 	}
 
-	platform_set_drvdata(pdev, ds);
+	/*
+	 * 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);
+	}
 
 	return 0;
+
+out:
+	dsa_of_remove(pdev);
+
+	return ret;
 }
 
 static int dsa_remove(struct platform_device *pdev)
 {
-	struct dsa_switch *ds = platform_get_drvdata(pdev);
+	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	int i;
 
-	if (ds->drv->poll_link != NULL)
-		del_timer_sync(&ds->link_poll_timer);
+	if (dst->link_poll_needed)
+		del_timer_sync(&dst->link_poll_timer);
 
-	flush_scheduled_work();
+	flush_work(&dst->link_poll_work);
 
-	dsa_switch_destroy(ds);
+	for (i = 0; i < dst->pd->nr_chips; i++) {
+		struct dsa_switch *ds = dst->ds[i];
+
+		if (ds != NULL)
+			dsa_switch_destroy(ds);
+	}
+
+	dsa_of_remove(pdev);
 
 	return 0;
 }
@@ -364,6 +609,12 @@ static void dsa_shutdown(struct platform_device *pdev)
 {
 }
 
+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,
@@ -371,22 +622,47 @@ static struct platform_driver dsa_driver = {
 	.driver = {
 		.name	= "dsa",
 		.owner	= THIS_MODULE,
+		.of_match_table = dsa_of_match_table,
 	},
 };
 
 static int __init dsa_init_module(void)
 {
-	return platform_driver_register(&dsa_driver);
+	int rc;
+
+	rc = platform_driver_register(&dsa_driver);
+	if (rc)
+		return rc;
+
+#ifdef CONFIG_NET_DSA_TAG_DSA
+	dev_add_pack(&dsa_packet_type);
+#endif
+#ifdef CONFIG_NET_DSA_TAG_EDSA
+	dev_add_pack(&edsa_packet_type);
+#endif
+#ifdef CONFIG_NET_DSA_TAG_TRAILER
+	dev_add_pack(&trailer_packet_type);
+#endif
+	return 0;
 }
 module_init(dsa_init_module);
 
 static void __exit dsa_cleanup_module(void)
 {
+#ifdef CONFIG_NET_DSA_TAG_TRAILER
+	dev_remove_pack(&trailer_packet_type);
+#endif
+#ifdef CONFIG_NET_DSA_TAG_EDSA
+	dev_remove_pack(&edsa_packet_type);
+#endif
+#ifdef CONFIG_NET_DSA_TAG_DSA
+	dev_remove_pack(&dsa_packet_type);
+#endif
 	platform_driver_unregister(&dsa_driver);
 }
 module_exit(dsa_cleanup_module);
 
-MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>")
+MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:dsa");