forked from Minki/linux
5e95329b70
This patch adds support for registering DSA switches using Device Tree bindings. Note that we support programming the switch routing table even though no in-tree user seems to require it. I tested this on Armada 370 with a Marvell 88E6172 (not supported by mainline yet). Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David S. Miller <davem@davemloft.net>
668 lines
14 KiB
C
668 lines
14 KiB
C
/*
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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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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#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>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#include "dsa_priv.h"
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char dsa_driver_version[] = "0.1";
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/* switch driver registration ***********************************************/
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static DEFINE_MUTEX(dsa_switch_drivers_mutex);
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static LIST_HEAD(dsa_switch_drivers);
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void register_switch_driver(struct dsa_switch_driver *drv)
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{
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mutex_lock(&dsa_switch_drivers_mutex);
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list_add_tail(&drv->list, &dsa_switch_drivers);
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mutex_unlock(&dsa_switch_drivers_mutex);
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}
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EXPORT_SYMBOL_GPL(register_switch_driver);
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void unregister_switch_driver(struct dsa_switch_driver *drv)
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{
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mutex_lock(&dsa_switch_drivers_mutex);
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list_del_init(&drv->list);
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mutex_unlock(&dsa_switch_drivers_mutex);
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}
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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 mii_bus *bus, int sw_addr, char **_name)
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{
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struct dsa_switch_driver *ret;
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struct list_head *list;
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char *name;
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ret = NULL;
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name = NULL;
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mutex_lock(&dsa_switch_drivers_mutex);
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list_for_each(list, &dsa_switch_drivers) {
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struct dsa_switch_driver *drv;
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drv = list_entry(list, struct dsa_switch_driver, list);
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name = drv->probe(bus, sw_addr);
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if (name != NULL) {
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ret = drv;
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break;
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}
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}
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mutex_unlock(&dsa_switch_drivers_mutex);
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*_name = name;
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return ret;
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}
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/* basic switch operations **************************************************/
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static struct dsa_switch *
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dsa_switch_setup(struct dsa_switch_tree *dst, int index,
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struct device *parent, struct mii_bus *bus)
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{
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struct dsa_chip_data *pd = dst->pd->chip + index;
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struct dsa_switch_driver *drv;
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struct dsa_switch *ds;
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int ret;
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char *name;
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int i;
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bool valid_name_found = false;
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/*
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* Probe for switch model.
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*/
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drv = dsa_switch_probe(bus, pd->sw_addr, &name);
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if (drv == NULL) {
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printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
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dst->master_netdev->name, index);
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return ERR_PTR(-EINVAL);
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}
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printk(KERN_INFO "%s[%d]: detected a %s switch\n",
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dst->master_netdev->name, index, name);
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/*
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* Allocate and initialise switch state.
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*/
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ds = kzalloc(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;
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ds->index = index;
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ds->pd = dst->pd->chip + index;
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ds->drv = drv;
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ds->master_mii_bus = bus;
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/*
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* Validate supplied switch configuration.
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*/
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for (i = 0; i < DSA_MAX_PORTS; i++) {
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char *name;
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name = pd->port_names[i];
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if (name == NULL)
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continue;
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if (!strcmp(name, "cpu")) {
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if (dst->cpu_switch != -1) {
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printk(KERN_ERR "multiple cpu ports?!\n");
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ret = -EINVAL;
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goto out;
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}
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dst->cpu_switch = index;
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dst->cpu_port = i;
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} else if (!strcmp(name, "dsa")) {
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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) {
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ret = -EINVAL;
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goto out;
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}
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/*
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* If the CPU connects to this switch, set the switch tree
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* tagging protocol to the preferred tagging format of this
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* switch.
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*/
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if (ds->dst->cpu_switch == index)
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ds->dst->tag_protocol = drv->tag_protocol;
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/*
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* Do basic register setup.
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*/
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ret = drv->setup(ds);
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if (ret < 0)
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goto out;
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ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
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if (ret < 0)
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goto out;
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ds->slave_mii_bus = mdiobus_alloc();
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if (ds->slave_mii_bus == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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dsa_slave_mii_bus_init(ds);
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ret = mdiobus_register(ds->slave_mii_bus);
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if (ret < 0)
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goto out_free;
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/*
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* Create network devices for physical switch ports.
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*/
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for (i = 0; i < DSA_MAX_PORTS; i++) {
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struct net_device *slave_dev;
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if (!(ds->phys_port_mask & (1 << i)))
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continue;
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slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
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if (slave_dev == NULL) {
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printk(KERN_ERR "%s[%d]: can't create dsa "
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"slave device for port %d(%s)\n",
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dst->master_netdev->name,
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index, i, pd->port_names[i]);
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continue;
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}
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ds->ports[i] = slave_dev;
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}
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return ds;
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out_free:
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mdiobus_free(ds->slave_mii_bus);
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out:
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kfree(ds);
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return ERR_PTR(ret);
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}
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static void dsa_switch_destroy(struct dsa_switch *ds)
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{
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}
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/* link polling *************************************************************/
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static void dsa_link_poll_work(struct work_struct *ugly)
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{
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struct dsa_switch_tree *dst;
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int i;
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dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
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for (i = 0; i < dst->pd->nr_chips; i++) {
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struct dsa_switch *ds = dst->ds[i];
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if (ds != NULL && ds->drv->poll_link != NULL)
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ds->drv->poll_link(ds);
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}
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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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}
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/* platform driver init and cleanup *****************************************/
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static int dev_is_class(struct device *dev, void *class)
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{
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if (dev->class != NULL && !strcmp(dev->class->name, class))
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return 1;
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return 0;
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}
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static struct device *dev_find_class(struct device *parent, char *class)
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{
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if (dev_is_class(parent, class)) {
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get_device(parent);
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return parent;
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}
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return device_find_child(parent, class, dev_is_class);
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}
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static struct mii_bus *dev_to_mii_bus(struct device *dev)
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{
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struct device *d;
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d = dev_find_class(dev, "mdio_bus");
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if (d != NULL) {
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struct mii_bus *bus;
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bus = to_mii_bus(d);
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put_device(d);
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return bus;
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}
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return NULL;
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}
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static struct net_device *dev_to_net_device(struct device *dev)
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{
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struct device *d;
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d = dev_find_class(dev, "net");
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if (d != NULL) {
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struct net_device *nd;
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nd = to_net_dev(d);
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dev_hold(nd);
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put_device(d);
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return nd;
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}
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return NULL;
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}
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#ifdef CONFIG_OF
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static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
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struct dsa_chip_data *cd,
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int chip_index,
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struct device_node *link)
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{
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int ret;
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const __be32 *reg;
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int link_port_addr;
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int link_sw_addr;
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struct device_node *parent_sw;
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int len;
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parent_sw = of_get_parent(link);
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if (!parent_sw)
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return -EINVAL;
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reg = of_get_property(parent_sw, "reg", &len);
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if (!reg || (len != sizeof(*reg) * 2))
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return -EINVAL;
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link_sw_addr = be32_to_cpup(reg + 1);
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if (link_sw_addr >= pd->nr_chips)
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return -EINVAL;
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/* First time routing table allocation */
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if (!cd->rtable) {
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cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
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if (!cd->rtable)
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return -ENOMEM;
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/* default to no valid uplink/downlink */
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memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
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}
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reg = of_get_property(link, "reg", NULL);
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if (!reg) {
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ret = -EINVAL;
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goto out;
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}
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link_port_addr = be32_to_cpup(reg);
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cd->rtable[link_sw_addr] = link_port_addr;
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return 0;
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out:
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kfree(cd->rtable);
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return ret;
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}
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static int dsa_of_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *child, *mdio, *ethernet, *port, *link;
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struct mii_bus *mdio_bus;
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struct platform_device *ethernet_dev;
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struct dsa_platform_data *pd;
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struct dsa_chip_data *cd;
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const char *port_name;
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int chip_index, port_index;
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const unsigned int *sw_addr, *port_reg;
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int ret, i;
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mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
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if (!mdio)
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return -EINVAL;
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mdio_bus = of_mdio_find_bus(mdio);
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if (!mdio_bus)
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return -EINVAL;
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ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
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if (!ethernet)
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return -EINVAL;
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ethernet_dev = of_find_device_by_node(ethernet);
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if (!ethernet_dev)
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return -ENODEV;
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return -ENOMEM;
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pdev->dev.platform_data = pd;
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pd->netdev = ðernet_dev->dev;
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pd->nr_chips = of_get_child_count(np);
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if (pd->nr_chips > DSA_MAX_SWITCHES)
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pd->nr_chips = DSA_MAX_SWITCHES;
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pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
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GFP_KERNEL);
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if (!pd->chip) {
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ret = -ENOMEM;
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goto out_free;
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}
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chip_index = 0;
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for_each_available_child_of_node(np, child) {
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cd = &pd->chip[chip_index];
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cd->mii_bus = &mdio_bus->dev;
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sw_addr = of_get_property(child, "reg", NULL);
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if (!sw_addr)
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continue;
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cd->sw_addr = be32_to_cpup(sw_addr);
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if (cd->sw_addr > PHY_MAX_ADDR)
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continue;
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for_each_available_child_of_node(child, port) {
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port_reg = of_get_property(port, "reg", NULL);
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if (!port_reg)
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continue;
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port_index = be32_to_cpup(port_reg);
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port_name = of_get_property(port, "label", NULL);
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if (!port_name)
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continue;
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cd->port_names[port_index] = kstrdup(port_name,
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GFP_KERNEL);
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if (!cd->port_names[port_index]) {
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ret = -ENOMEM;
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goto out_free_chip;
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}
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link = of_parse_phandle(port, "link", 0);
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if (!strcmp(port_name, "dsa") && link &&
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pd->nr_chips > 1) {
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ret = dsa_of_setup_routing_table(pd, cd,
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chip_index, link);
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if (ret)
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goto out_free_chip;
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}
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if (port_index == DSA_MAX_PORTS)
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break;
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}
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}
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return 0;
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out_free_chip:
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for (i = 0; i < pd->nr_chips; i++) {
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port_index = 0;
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while (pd->chip[i].port_names &&
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pd->chip[i].port_names[++port_index])
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kfree(pd->chip[i].port_names[port_index]);
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kfree(pd->chip[i].rtable);
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}
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kfree(pd->chip);
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out_free:
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kfree(pd);
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pdev->dev.platform_data = NULL;
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return ret;
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}
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static void dsa_of_remove(struct platform_device *pdev)
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{
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struct dsa_platform_data *pd = pdev->dev.platform_data;
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int i;
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int port_index;
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if (!pdev->dev.of_node)
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return;
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for (i = 0; i < pd->nr_chips; i++) {
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port_index = 0;
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while (pd->chip[i].port_names &&
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pd->chip[i].port_names[++port_index])
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kfree(pd->chip[i].port_names[port_index]);
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kfree(pd->chip[i].rtable);
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}
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kfree(pd->chip);
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kfree(pd);
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}
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#else
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static inline int dsa_of_probe(struct platform_device *pdev)
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{
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return 0;
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}
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static inline void dsa_of_remove(struct platform_device *pdev)
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{
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}
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#endif
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static int dsa_probe(struct platform_device *pdev)
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{
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static int dsa_version_printed;
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struct dsa_platform_data *pd = pdev->dev.platform_data;
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struct net_device *dev;
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struct dsa_switch_tree *dst;
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int i, ret;
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if (!dsa_version_printed++)
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printk(KERN_NOTICE "Distributed Switch Architecture "
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"driver version %s\n", dsa_driver_version);
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if (pdev->dev.of_node) {
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ret = dsa_of_probe(pdev);
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if (ret)
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return ret;
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pd = pdev->dev.platform_data;
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}
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if (pd == NULL || pd->netdev == NULL)
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return -EINVAL;
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dev = dev_to_net_device(pd->netdev);
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if (dev == NULL) {
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ret = -EINVAL;
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goto out;
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}
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if (dev->dsa_ptr != NULL) {
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dev_put(dev);
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ret = -EEXIST;
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goto out;
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}
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dst = kzalloc(sizeof(*dst), GFP_KERNEL);
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if (dst == NULL) {
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dev_put(dev);
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ret = -ENOMEM;
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goto out;
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}
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platform_set_drvdata(pdev, dst);
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dst->pd = pd;
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dst->master_netdev = dev;
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dst->cpu_switch = -1;
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dst->cpu_port = -1;
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for (i = 0; i < pd->nr_chips; i++) {
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struct mii_bus *bus;
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struct dsa_switch *ds;
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bus = dev_to_mii_bus(pd->chip[i].mii_bus);
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if (bus == NULL) {
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printk(KERN_ERR "%s[%d]: no mii bus found for "
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"dsa switch\n", dev->name, i);
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continue;
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}
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ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
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if (IS_ERR(ds)) {
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printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
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"instance (error %ld)\n", dev->name, i,
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PTR_ERR(ds));
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continue;
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}
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|
|
dst->ds[i] = ds;
|
|
if (ds->drv->poll_link != NULL)
|
|
dst->link_poll_needed = 1;
|
|
}
|
|
|
|
/*
|
|
* 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_tree *dst = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
if (dst->link_poll_needed)
|
|
del_timer_sync(&dst->link_poll_timer);
|
|
|
|
flush_work(&dst->link_poll_work);
|
|
|
|
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;
|
|
}
|
|
|
|
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,
|
|
.shutdown = dsa_shutdown,
|
|
.driver = {
|
|
.name = "dsa",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = dsa_of_match_table,
|
|
},
|
|
};
|
|
|
|
static int __init dsa_init_module(void)
|
|
{
|
|
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_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:dsa");
|