2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/list.h>
13 #include <linux/netdevice.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
19 #include <linux/of_mdio.h>
20 #include <linux/of_platform.h>
23 char dsa_driver_version[] = "0.1";
26 /* switch driver registration ***********************************************/
27 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
28 static LIST_HEAD(dsa_switch_drivers);
30 void register_switch_driver(struct dsa_switch_driver *drv)
32 mutex_lock(&dsa_switch_drivers_mutex);
33 list_add_tail(&drv->list, &dsa_switch_drivers);
34 mutex_unlock(&dsa_switch_drivers_mutex);
36 EXPORT_SYMBOL_GPL(register_switch_driver);
38 void unregister_switch_driver(struct dsa_switch_driver *drv)
40 mutex_lock(&dsa_switch_drivers_mutex);
41 list_del_init(&drv->list);
42 mutex_unlock(&dsa_switch_drivers_mutex);
44 EXPORT_SYMBOL_GPL(unregister_switch_driver);
46 static struct dsa_switch_driver *
47 dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
49 struct dsa_switch_driver *ret;
50 struct list_head *list;
56 mutex_lock(&dsa_switch_drivers_mutex);
57 list_for_each(list, &dsa_switch_drivers) {
58 struct dsa_switch_driver *drv;
60 drv = list_entry(list, struct dsa_switch_driver, list);
62 name = drv->probe(bus, sw_addr);
68 mutex_unlock(&dsa_switch_drivers_mutex);
76 /* basic switch operations **************************************************/
77 static struct dsa_switch *
78 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
79 struct device *parent, struct mii_bus *bus)
81 struct dsa_chip_data *pd = dst->pd->chip + index;
82 struct dsa_switch_driver *drv;
83 struct dsa_switch *ds;
87 bool valid_name_found = false;
90 * Probe for switch model.
92 drv = dsa_switch_probe(bus, pd->sw_addr, &name);
94 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
95 dst->master_netdev->name, index);
96 return ERR_PTR(-EINVAL);
98 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
99 dst->master_netdev->name, index, name);
103 * Allocate and initialise switch state.
105 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
107 return ERR_PTR(-ENOMEM);
111 ds->pd = dst->pd->chip + index;
113 ds->master_mii_bus = bus;
117 * Validate supplied switch configuration.
119 for (i = 0; i < DSA_MAX_PORTS; i++) {
122 name = pd->port_names[i];
126 if (!strcmp(name, "cpu")) {
127 if (dst->cpu_switch != -1) {
128 printk(KERN_ERR "multiple cpu ports?!\n");
132 dst->cpu_switch = index;
134 } else if (!strcmp(name, "dsa")) {
135 ds->dsa_port_mask |= 1 << i;
137 ds->phys_port_mask |= 1 << i;
139 valid_name_found = true;
142 if (!valid_name_found && i == DSA_MAX_PORTS) {
147 /* Make the built-in MII bus mask match the number of ports,
148 * switch drivers can override this later
150 ds->phys_mii_mask = ds->phys_port_mask;
153 * If the CPU connects to this switch, set the switch tree
154 * tagging protocol to the preferred tagging format of this
157 if (ds->dst->cpu_switch == index)
158 ds->dst->tag_protocol = drv->tag_protocol;
162 * Do basic register setup.
164 ret = drv->setup(ds);
168 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
172 ds->slave_mii_bus = mdiobus_alloc();
173 if (ds->slave_mii_bus == NULL) {
177 dsa_slave_mii_bus_init(ds);
179 ret = mdiobus_register(ds->slave_mii_bus);
185 * Create network devices for physical switch ports.
187 for (i = 0; i < DSA_MAX_PORTS; i++) {
188 struct net_device *slave_dev;
190 if (!(ds->phys_port_mask & (1 << i)))
193 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
194 if (slave_dev == NULL) {
195 printk(KERN_ERR "%s[%d]: can't create dsa "
196 "slave device for port %d(%s)\n",
197 dst->master_netdev->name,
198 index, i, pd->port_names[i]);
202 ds->ports[i] = slave_dev;
208 mdiobus_free(ds->slave_mii_bus);
214 static void dsa_switch_destroy(struct dsa_switch *ds)
219 /* link polling *************************************************************/
220 static void dsa_link_poll_work(struct work_struct *ugly)
222 struct dsa_switch_tree *dst;
225 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
227 for (i = 0; i < dst->pd->nr_chips; i++) {
228 struct dsa_switch *ds = dst->ds[i];
230 if (ds != NULL && ds->drv->poll_link != NULL)
231 ds->drv->poll_link(ds);
234 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
237 static void dsa_link_poll_timer(unsigned long _dst)
239 struct dsa_switch_tree *dst = (void *)_dst;
241 schedule_work(&dst->link_poll_work);
245 /* platform driver init and cleanup *****************************************/
246 static int dev_is_class(struct device *dev, void *class)
248 if (dev->class != NULL && !strcmp(dev->class->name, class))
254 static struct device *dev_find_class(struct device *parent, char *class)
256 if (dev_is_class(parent, class)) {
261 return device_find_child(parent, class, dev_is_class);
264 static struct mii_bus *dev_to_mii_bus(struct device *dev)
268 d = dev_find_class(dev, "mdio_bus");
281 static struct net_device *dev_to_net_device(struct device *dev)
285 d = dev_find_class(dev, "net");
287 struct net_device *nd;
300 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
301 struct dsa_chip_data *cd,
303 struct device_node *link)
309 struct device_node *parent_sw;
312 parent_sw = of_get_parent(link);
316 reg = of_get_property(parent_sw, "reg", &len);
317 if (!reg || (len != sizeof(*reg) * 2))
320 link_sw_addr = be32_to_cpup(reg + 1);
322 if (link_sw_addr >= pd->nr_chips)
325 /* First time routing table allocation */
327 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
331 /* default to no valid uplink/downlink */
332 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
335 reg = of_get_property(link, "reg", NULL);
341 link_port_addr = be32_to_cpup(reg);
343 cd->rtable[link_sw_addr] = link_port_addr;
351 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
356 for (i = 0; i < pd->nr_chips; i++) {
358 while (port_index < DSA_MAX_PORTS) {
359 kfree(pd->chip[i].port_names[port_index]);
362 kfree(pd->chip[i].rtable);
367 static int dsa_of_probe(struct platform_device *pdev)
369 struct device_node *np = pdev->dev.of_node;
370 struct device_node *child, *mdio, *ethernet, *port, *link;
371 struct mii_bus *mdio_bus;
372 struct platform_device *ethernet_dev;
373 struct dsa_platform_data *pd;
374 struct dsa_chip_data *cd;
375 const char *port_name;
376 int chip_index, port_index;
377 const unsigned int *sw_addr, *port_reg;
380 mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
384 mdio_bus = of_mdio_find_bus(mdio);
388 ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
392 ethernet_dev = of_find_device_by_node(ethernet);
396 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
400 pdev->dev.platform_data = pd;
401 pd->netdev = ðernet_dev->dev;
402 pd->nr_chips = of_get_child_count(np);
403 if (pd->nr_chips > DSA_MAX_SWITCHES)
404 pd->nr_chips = DSA_MAX_SWITCHES;
406 pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
414 for_each_available_child_of_node(np, child) {
416 cd = &pd->chip[chip_index];
419 cd->mii_bus = &mdio_bus->dev;
421 sw_addr = of_get_property(child, "reg", NULL);
425 cd->sw_addr = be32_to_cpup(sw_addr);
426 if (cd->sw_addr > PHY_MAX_ADDR)
429 for_each_available_child_of_node(child, port) {
430 port_reg = of_get_property(port, "reg", NULL);
434 port_index = be32_to_cpup(port_reg);
436 port_name = of_get_property(port, "label", NULL);
440 cd->port_dn[port_index] = port;
442 cd->port_names[port_index] = kstrdup(port_name,
444 if (!cd->port_names[port_index]) {
449 link = of_parse_phandle(port, "link", 0);
451 if (!strcmp(port_name, "dsa") && link &&
453 ret = dsa_of_setup_routing_table(pd, cd,
459 if (port_index == DSA_MAX_PORTS)
467 dsa_of_free_platform_data(pd);
470 pdev->dev.platform_data = NULL;
474 static void dsa_of_remove(struct platform_device *pdev)
476 struct dsa_platform_data *pd = pdev->dev.platform_data;
478 if (!pdev->dev.of_node)
481 dsa_of_free_platform_data(pd);
485 static inline int dsa_of_probe(struct platform_device *pdev)
490 static inline void dsa_of_remove(struct platform_device *pdev)
495 static int dsa_probe(struct platform_device *pdev)
497 static int dsa_version_printed;
498 struct dsa_platform_data *pd = pdev->dev.platform_data;
499 struct net_device *dev;
500 struct dsa_switch_tree *dst;
503 if (!dsa_version_printed++)
504 printk(KERN_NOTICE "Distributed Switch Architecture "
505 "driver version %s\n", dsa_driver_version);
507 if (pdev->dev.of_node) {
508 ret = dsa_of_probe(pdev);
512 pd = pdev->dev.platform_data;
515 if (pd == NULL || pd->netdev == NULL)
518 dev = dev_to_net_device(pd->netdev);
524 if (dev->dsa_ptr != NULL) {
530 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
537 platform_set_drvdata(pdev, dst);
540 dst->master_netdev = dev;
541 dst->cpu_switch = -1;
544 for (i = 0; i < pd->nr_chips; i++) {
546 struct dsa_switch *ds;
548 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
550 printk(KERN_ERR "%s[%d]: no mii bus found for "
551 "dsa switch\n", dev->name, i);
555 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
557 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
558 "instance (error %ld)\n", dev->name, i,
564 if (ds->drv->poll_link != NULL)
565 dst->link_poll_needed = 1;
569 * If we use a tagging format that doesn't have an ethertype
570 * field, make sure that all packets from this point on get
571 * sent to the tag format's receive function.
574 dev->dsa_ptr = (void *)dst;
576 if (dst->link_poll_needed) {
577 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
578 init_timer(&dst->link_poll_timer);
579 dst->link_poll_timer.data = (unsigned long)dst;
580 dst->link_poll_timer.function = dsa_link_poll_timer;
581 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
582 add_timer(&dst->link_poll_timer);
593 static int dsa_remove(struct platform_device *pdev)
595 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
598 if (dst->link_poll_needed)
599 del_timer_sync(&dst->link_poll_timer);
601 flush_work(&dst->link_poll_work);
603 for (i = 0; i < dst->pd->nr_chips; i++) {
604 struct dsa_switch *ds = dst->ds[i];
607 dsa_switch_destroy(ds);
615 static void dsa_shutdown(struct platform_device *pdev)
619 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
620 struct packet_type *pt, struct net_device *orig_dev)
622 struct dsa_switch_tree *dst = dev->dsa_ptr;
624 if (unlikely(dst == NULL)) {
629 return dst->ops->rcv(skb, dev, pt, orig_dev);
632 struct packet_type dsa_pack_type __read_mostly = {
633 .type = cpu_to_be16(ETH_P_XDSA),
634 .func = dsa_switch_rcv,
637 static const struct of_device_id dsa_of_match_table[] = {
638 { .compatible = "brcm,bcm7445-switch-v4.0" },
639 { .compatible = "marvell,dsa", },
642 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
644 static struct platform_driver dsa_driver = {
646 .remove = dsa_remove,
647 .shutdown = dsa_shutdown,
650 .owner = THIS_MODULE,
651 .of_match_table = dsa_of_match_table,
655 static int __init dsa_init_module(void)
659 rc = platform_driver_register(&dsa_driver);
663 dev_add_pack(&dsa_pack_type);
667 module_init(dsa_init_module);
669 static void __exit dsa_cleanup_module(void)
671 dev_remove_pack(&dsa_pack_type);
672 platform_driver_unregister(&dsa_driver);
674 module_exit(dsa_cleanup_module);
676 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
677 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
678 MODULE_LICENSE("GPL");
679 MODULE_ALIAS("platform:dsa");