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-rw-r--r--net/dsa/legacy.c748
1 files changed, 748 insertions, 0 deletions
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
new file mode 100644
index 000000000..42a7b85b8
--- /dev/null
+++ b/net/dsa/legacy.c
@@ -0,0 +1,748 @@
+/*
+ * net/dsa/legacy.c - Hardware switch handling
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/of_net.h>
+#include <linux/netdevice.h>
+#include <linux/sysfs.h>
+#include <linux/phy_fixed.h>
+#include <linux/etherdevice.h>
+
+#include "dsa_priv.h"
+
+/* switch driver registration ***********************************************/
+static DEFINE_MUTEX(dsa_switch_drivers_mutex);
+static LIST_HEAD(dsa_switch_drivers);
+
+void register_switch_driver(struct dsa_switch_driver *drv)
+{
+ mutex_lock(&dsa_switch_drivers_mutex);
+ list_add_tail(&drv->list, &dsa_switch_drivers);
+ mutex_unlock(&dsa_switch_drivers_mutex);
+}
+EXPORT_SYMBOL_GPL(register_switch_driver);
+
+void unregister_switch_driver(struct dsa_switch_driver *drv)
+{
+ mutex_lock(&dsa_switch_drivers_mutex);
+ list_del_init(&drv->list);
+ mutex_unlock(&dsa_switch_drivers_mutex);
+}
+EXPORT_SYMBOL_GPL(unregister_switch_driver);
+
+static const struct dsa_switch_ops *
+dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
+ const char **_name, void **priv)
+{
+ const struct dsa_switch_ops *ret;
+ struct list_head *list;
+ const char *name;
+
+ ret = NULL;
+ name = NULL;
+
+ mutex_lock(&dsa_switch_drivers_mutex);
+ list_for_each(list, &dsa_switch_drivers) {
+ const struct dsa_switch_ops *ops;
+ struct dsa_switch_driver *drv;
+
+ drv = list_entry(list, struct dsa_switch_driver, list);
+ ops = drv->ops;
+
+ name = ops->probe(parent, host_dev, sw_addr, priv);
+ if (name != NULL) {
+ ret = ops;
+ break;
+ }
+ }
+ mutex_unlock(&dsa_switch_drivers_mutex);
+
+ *_name = name;
+
+ return ret;
+}
+
+/* basic switch operations **************************************************/
+static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
+{
+ int ret, port;
+
+ for (port = 0; port < ds->num_ports; port++) {
+ if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
+ continue;
+
+ ret = dsa_port_link_register_of(&ds->ports[port]);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int dsa_switch_setup_one(struct dsa_switch *ds,
+ struct net_device *master)
+{
+ const struct dsa_switch_ops *ops = ds->ops;
+ struct dsa_switch_tree *dst = ds->dst;
+ struct dsa_chip_data *cd = ds->cd;
+ bool valid_name_found = false;
+ int index = ds->index;
+ struct dsa_port *dp;
+ int i, ret;
+
+ /*
+ * Validate supplied switch configuration.
+ */
+ for (i = 0; i < ds->num_ports; i++) {
+ char *name;
+
+ dp = &ds->ports[i];
+
+ name = cd->port_names[i];
+ if (name == NULL)
+ continue;
+ dp->name = name;
+
+ if (!strcmp(name, "cpu")) {
+ if (dst->cpu_dp) {
+ netdev_err(master,
+ "multiple cpu ports?!\n");
+ return -EINVAL;
+ }
+ dst->cpu_dp = &ds->ports[i];
+ dst->cpu_dp->master = master;
+ dp->type = DSA_PORT_TYPE_CPU;
+ } else if (!strcmp(name, "dsa")) {
+ dp->type = DSA_PORT_TYPE_DSA;
+ } else {
+ dp->type = DSA_PORT_TYPE_USER;
+ }
+ valid_name_found = true;
+ }
+
+ if (!valid_name_found && i == ds->num_ports)
+ return -EINVAL;
+
+ /* Make the built-in MII bus mask match the number of ports,
+ * switch drivers can override this later
+ */
+ ds->phys_mii_mask |= dsa_user_ports(ds);
+
+ /*
+ * If the CPU connects to this switch, set the switch tree
+ * tagging protocol to the preferred tagging format of this
+ * switch.
+ */
+ if (dst->cpu_dp->ds == ds) {
+ const struct dsa_device_ops *tag_ops;
+ enum dsa_tag_protocol tag_protocol;
+
+ tag_protocol = ops->get_tag_protocol(ds, dst->cpu_dp->index);
+ tag_ops = dsa_resolve_tag_protocol(tag_protocol);
+ if (IS_ERR(tag_ops))
+ return PTR_ERR(tag_ops);
+
+ dst->cpu_dp->tag_ops = tag_ops;
+
+ /* Few copies for faster access in master receive hot path */
+ dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
+ dst->cpu_dp->dst = dst;
+ }
+
+ memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
+
+ /*
+ * Do basic register setup.
+ */
+ ret = ops->setup(ds);
+ if (ret < 0)
+ return ret;
+
+ ret = dsa_switch_register_notifier(ds);
+ if (ret)
+ return ret;
+
+ if (!ds->slave_mii_bus && ops->phy_read) {
+ ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
+ if (!ds->slave_mii_bus)
+ return -ENOMEM;
+ dsa_slave_mii_bus_init(ds);
+
+ ret = mdiobus_register(ds->slave_mii_bus);
+ if (ret < 0)
+ return ret;
+ }
+
+ /*
+ * Create network devices for physical switch ports.
+ */
+ for (i = 0; i < ds->num_ports; i++) {
+ ds->ports[i].dn = cd->port_dn[i];
+ ds->ports[i].cpu_dp = dst->cpu_dp;
+
+ if (!dsa_is_user_port(ds, i))
+ continue;
+
+ ret = dsa_slave_create(&ds->ports[i]);
+ if (ret < 0)
+ netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
+ index, i, cd->port_names[i], ret);
+ }
+
+ /* Perform configuration of the CPU and DSA ports */
+ ret = dsa_cpu_dsa_setups(ds);
+ if (ret < 0)
+ netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
+ index);
+
+ return 0;
+}
+
+static struct dsa_switch *
+dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
+ int index, struct device *parent, struct device *host_dev)
+{
+ struct dsa_chip_data *cd = dst->pd->chip + index;
+ const struct dsa_switch_ops *ops;
+ struct dsa_switch *ds;
+ int ret;
+ const char *name;
+ void *priv;
+
+ /*
+ * Probe for switch model.
+ */
+ ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
+ if (!ops) {
+ netdev_err(master, "[%d]: could not detect attached switch\n",
+ index);
+ return ERR_PTR(-EINVAL);
+ }
+ netdev_info(master, "[%d]: detected a %s switch\n",
+ index, name);
+
+
+ /*
+ * Allocate and initialise switch state.
+ */
+ ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
+ if (!ds)
+ return ERR_PTR(-ENOMEM);
+
+ ds->dst = dst;
+ ds->index = index;
+ ds->cd = cd;
+ ds->ops = ops;
+ ds->priv = priv;
+
+ ret = dsa_switch_setup_one(ds, master);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return ds;
+}
+
+static void dsa_switch_destroy(struct dsa_switch *ds)
+{
+ int port;
+
+ /* Destroy network devices for physical switch ports. */
+ for (port = 0; port < ds->num_ports; port++) {
+ if (!dsa_is_user_port(ds, port))
+ continue;
+
+ if (!ds->ports[port].slave)
+ continue;
+
+ dsa_slave_destroy(ds->ports[port].slave);
+ }
+
+ /* Disable configuration of the CPU and DSA ports */
+ for (port = 0; port < ds->num_ports; port++) {
+ if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
+ continue;
+ dsa_port_link_unregister_of(&ds->ports[port]);
+ }
+
+ if (ds->slave_mii_bus && ds->ops->phy_read)
+ mdiobus_unregister(ds->slave_mii_bus);
+
+ dsa_switch_unregister_notifier(ds);
+}
+
+/* platform driver init and cleanup *****************************************/
+static int dev_is_class(struct device *dev, void *class)
+{
+ if (dev->class != NULL && !strcmp(dev->class->name, class))
+ return 1;
+
+ return 0;
+}
+
+static struct device *dev_find_class(struct device *parent, char *class)
+{
+ if (dev_is_class(parent, class)) {
+ get_device(parent);
+ return parent;
+ }
+
+ return device_find_child(parent, class, dev_is_class);
+}
+
+struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
+{
+ struct device *d;
+
+ d = dev_find_class(dev, "mdio_bus");
+ if (d != NULL) {
+ struct mii_bus *bus;
+
+ bus = to_mii_bus(d);
+ put_device(d);
+
+ return bus;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
+
+#ifdef CONFIG_OF
+static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
+ struct dsa_chip_data *cd,
+ int chip_index, int port_index,
+ struct device_node *link)
+{
+ const __be32 *reg;
+ int link_sw_addr;
+ struct device_node *parent_sw;
+ int len;
+
+ parent_sw = of_get_parent(link);
+ if (!parent_sw)
+ return -EINVAL;
+
+ reg = of_get_property(parent_sw, "reg", &len);
+ if (!reg || (len != sizeof(*reg) * 2))
+ return -EINVAL;
+
+ /*
+ * Get the destination switch number from the second field of its 'reg'
+ * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
+ */
+ link_sw_addr = be32_to_cpup(reg + 1);
+
+ if (link_sw_addr >= pd->nr_chips)
+ return -EINVAL;
+
+ cd->rtable[link_sw_addr] = port_index;
+
+ return 0;
+}
+
+static int dsa_of_probe_links(struct dsa_platform_data *pd,
+ struct dsa_chip_data *cd,
+ int chip_index, int port_index,
+ struct device_node *port,
+ const char *port_name)
+{
+ struct device_node *link;
+ int link_index;
+ int ret;
+
+ for (link_index = 0;; link_index++) {
+ link = of_parse_phandle(port, "link", link_index);
+ if (!link)
+ break;
+
+ if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
+ ret = dsa_of_setup_routing_table(pd, cd, chip_index,
+ port_index, link);
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
+{
+ int i;
+ int port_index;
+
+ for (i = 0; i < pd->nr_chips; i++) {
+ port_index = 0;
+ while (port_index < DSA_MAX_PORTS) {
+ kfree(pd->chip[i].port_names[port_index]);
+ port_index++;
+ }
+
+ /* Drop our reference to the MDIO bus device */
+ if (pd->chip[i].host_dev)
+ put_device(pd->chip[i].host_dev);
+ }
+ kfree(pd->chip);
+}
+
+static int dsa_of_probe(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *child, *mdio, *ethernet, *port;
+ struct mii_bus *mdio_bus, *mdio_bus_switch;
+ struct net_device *ethernet_dev;
+ struct dsa_platform_data *pd;
+ struct dsa_chip_data *cd;
+ const char *port_name;
+ int chip_index, port_index;
+ const unsigned int *sw_addr, *port_reg;
+ u32 eeprom_len;
+ int ret;
+
+ mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
+ if (!mdio)
+ return -EINVAL;
+
+ mdio_bus = of_mdio_find_bus(mdio);
+ if (!mdio_bus)
+ return -EPROBE_DEFER;
+
+ ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
+ if (!ethernet) {
+ ret = -EINVAL;
+ goto out_put_mdio;
+ }
+
+ ethernet_dev = of_find_net_device_by_node(ethernet);
+ if (!ethernet_dev) {
+ ret = -EPROBE_DEFER;
+ goto out_put_mdio;
+ }
+
+ pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+ if (!pd) {
+ ret = -ENOMEM;
+ goto out_put_ethernet;
+ }
+
+ dev->platform_data = pd;
+ pd->of_netdev = ethernet_dev;
+ pd->nr_chips = of_get_available_child_count(np);
+ if (pd->nr_chips > DSA_MAX_SWITCHES)
+ pd->nr_chips = DSA_MAX_SWITCHES;
+
+ pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
+ GFP_KERNEL);
+ if (!pd->chip) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ chip_index = -1;
+ for_each_available_child_of_node(np, child) {
+ int i;
+
+ chip_index++;
+ cd = &pd->chip[chip_index];
+
+ cd->of_node = child;
+
+ /* Initialize the routing table */
+ for (i = 0; i < DSA_MAX_SWITCHES; ++i)
+ cd->rtable[i] = DSA_RTABLE_NONE;
+
+ /* When assigning the host device, increment its refcount */
+ cd->host_dev = get_device(&mdio_bus->dev);
+
+ sw_addr = of_get_property(child, "reg", NULL);
+ if (!sw_addr)
+ continue;
+
+ cd->sw_addr = be32_to_cpup(sw_addr);
+ if (cd->sw_addr >= PHY_MAX_ADDR)
+ continue;
+
+ if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
+ cd->eeprom_len = eeprom_len;
+
+ mdio = of_parse_phandle(child, "mii-bus", 0);
+ if (mdio) {
+ mdio_bus_switch = of_mdio_find_bus(mdio);
+ if (!mdio_bus_switch) {
+ ret = -EPROBE_DEFER;
+ goto out_free_chip;
+ }
+
+ /* Drop the mdio_bus device ref, replacing the host
+ * device with the mdio_bus_switch device, keeping
+ * the refcount from of_mdio_find_bus() above.
+ */
+ put_device(cd->host_dev);
+ cd->host_dev = &mdio_bus_switch->dev;
+ }
+
+ for_each_available_child_of_node(child, port) {
+ port_reg = of_get_property(port, "reg", NULL);
+ if (!port_reg)
+ continue;
+
+ port_index = be32_to_cpup(port_reg);
+ if (port_index >= DSA_MAX_PORTS)
+ break;
+
+ port_name = of_get_property(port, "label", NULL);
+ if (!port_name)
+ continue;
+
+ cd->port_dn[port_index] = port;
+
+ cd->port_names[port_index] = kstrdup(port_name,
+ GFP_KERNEL);
+ if (!cd->port_names[port_index]) {
+ ret = -ENOMEM;
+ goto out_free_chip;
+ }
+
+ ret = dsa_of_probe_links(pd, cd, chip_index,
+ port_index, port, port_name);
+ if (ret)
+ goto out_free_chip;
+
+ }
+ }
+
+ /* The individual chips hold their own refcount on the mdio bus,
+ * so drop ours */
+ put_device(&mdio_bus->dev);
+
+ return 0;
+
+out_free_chip:
+ dsa_of_free_platform_data(pd);
+out_free:
+ kfree(pd);
+ dev->platform_data = NULL;
+out_put_ethernet:
+ put_device(&ethernet_dev->dev);
+out_put_mdio:
+ put_device(&mdio_bus->dev);
+ return ret;
+}
+
+static void dsa_of_remove(struct device *dev)
+{
+ struct dsa_platform_data *pd = dev->platform_data;
+
+ if (!dev->of_node)
+ return;
+
+ dsa_of_free_platform_data(pd);
+ put_device(&pd->of_netdev->dev);
+ kfree(pd);
+}
+#else
+static inline int dsa_of_probe(struct device *dev)
+{
+ return 0;
+}
+
+static inline void dsa_of_remove(struct device *dev)
+{
+}
+#endif
+
+static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
+ struct device *parent, struct dsa_platform_data *pd)
+{
+ int i;
+ unsigned configured = 0;
+
+ dst->pd = pd;
+
+ for (i = 0; i < pd->nr_chips; i++) {
+ struct dsa_switch *ds;
+
+ ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
+ if (IS_ERR(ds)) {
+ netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
+ i, PTR_ERR(ds));
+ continue;
+ }
+
+ dst->ds[i] = ds;
+
+ ++configured;
+ }
+
+ /*
+ * If no switch was found, exit cleanly
+ */
+ if (!configured)
+ return -EPROBE_DEFER;
+
+ return dsa_master_setup(dst->cpu_dp->master, dst->cpu_dp);
+}
+
+static int dsa_probe(struct platform_device *pdev)
+{
+ struct dsa_platform_data *pd = pdev->dev.platform_data;
+ struct net_device *dev;
+ struct dsa_switch_tree *dst;
+ int ret;
+
+ if (pdev->dev.of_node) {
+ ret = dsa_of_probe(&pdev->dev);
+ if (ret)
+ return ret;
+
+ pd = pdev->dev.platform_data;
+ }
+
+ if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
+ return -EINVAL;
+
+ if (pd->of_netdev) {
+ dev = pd->of_netdev;
+ dev_hold(dev);
+ } else {
+ dev = dsa_dev_to_net_device(pd->netdev);
+ }
+ if (dev == NULL) {
+ ret = -EPROBE_DEFER;
+ goto out;
+ }
+
+ if (dev->dsa_ptr != NULL) {
+ dev_put(dev);
+ ret = -EEXIST;
+ goto out;
+ }
+
+ dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
+ if (dst == NULL) {
+ dev_put(dev);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ platform_set_drvdata(pdev, dst);
+
+ ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
+ if (ret) {
+ dev_put(dev);
+ goto out;
+ }
+
+ return 0;
+
+out:
+ dsa_of_remove(&pdev->dev);
+
+ return ret;
+}
+
+static void dsa_remove_dst(struct dsa_switch_tree *dst)
+{
+ int i;
+
+ dsa_master_teardown(dst->cpu_dp->master);
+
+ for (i = 0; i < dst->pd->nr_chips; i++) {
+ struct dsa_switch *ds = dst->ds[i];
+
+ if (ds)
+ dsa_switch_destroy(ds);
+ }
+
+ dev_put(dst->cpu_dp->master);
+}
+
+static int dsa_remove(struct platform_device *pdev)
+{
+ struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+
+ dsa_remove_dst(dst);
+ dsa_of_remove(&pdev->dev);
+
+ return 0;
+}
+
+static void dsa_shutdown(struct platform_device *pdev)
+{
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dsa_suspend(struct device *d)
+{
+ struct 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);
+
+static const struct of_device_id dsa_of_match_table[] = {
+ { .compatible = "marvell,dsa", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, dsa_of_match_table);
+
+static struct platform_driver dsa_driver = {
+ .probe = dsa_probe,
+ .remove = dsa_remove,
+ .shutdown = dsa_shutdown,
+ .driver = {
+ .name = "dsa",
+ .of_match_table = dsa_of_match_table,
+ .pm = &dsa_pm_ops,
+ },
+};
+
+int dsa_legacy_register(void)
+{
+ return platform_driver_register(&dsa_driver);
+}
+
+void dsa_legacy_unregister(void)
+{
+ platform_driver_unregister(&dsa_driver);
+}
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