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/platform_device.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
18 #include <linux/of_mdio.h>
19 #include <linux/of_platform.h>
22 char dsa_driver_version[] = "0.1";
25 /* switch driver registration ***********************************************/
26 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
27 static LIST_HEAD(dsa_switch_drivers);
29 void register_switch_driver(struct dsa_switch_driver *drv)
31 mutex_lock(&dsa_switch_drivers_mutex);
32 list_add_tail(&drv->list, &dsa_switch_drivers);
33 mutex_unlock(&dsa_switch_drivers_mutex);
35 EXPORT_SYMBOL_GPL(register_switch_driver);
37 void unregister_switch_driver(struct dsa_switch_driver *drv)
39 mutex_lock(&dsa_switch_drivers_mutex);
40 list_del_init(&drv->list);
41 mutex_unlock(&dsa_switch_drivers_mutex);
43 EXPORT_SYMBOL_GPL(unregister_switch_driver);
45 static struct dsa_switch_driver *
46 dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
48 struct dsa_switch_driver *ret;
49 struct list_head *list;
55 mutex_lock(&dsa_switch_drivers_mutex);
56 list_for_each(list, &dsa_switch_drivers) {
57 struct dsa_switch_driver *drv;
59 drv = list_entry(list, struct dsa_switch_driver, list);
61 name = drv->probe(bus, sw_addr);
67 mutex_unlock(&dsa_switch_drivers_mutex);
75 /* basic switch operations **************************************************/
76 static struct dsa_switch *
77 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
78 struct device *parent, struct mii_bus *bus)
80 struct dsa_chip_data *pd = dst->pd->chip + index;
81 struct dsa_switch_driver *drv;
82 struct dsa_switch *ds;
86 bool valid_name_found = false;
89 * Probe for switch model.
91 drv = dsa_switch_probe(bus, pd->sw_addr, &name);
93 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
94 dst->master_netdev->name, index);
95 return ERR_PTR(-EINVAL);
97 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
98 dst->master_netdev->name, index, name);
102 * Allocate and initialise switch state.
104 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
106 return ERR_PTR(-ENOMEM);
110 ds->pd = dst->pd->chip + index;
112 ds->master_mii_bus = bus;
116 * Validate supplied switch configuration.
118 for (i = 0; i < DSA_MAX_PORTS; i++) {
121 name = pd->port_names[i];
125 if (!strcmp(name, "cpu")) {
126 if (dst->cpu_switch != -1) {
127 printk(KERN_ERR "multiple cpu ports?!\n");
131 dst->cpu_switch = index;
133 } else if (!strcmp(name, "dsa")) {
134 ds->dsa_port_mask |= 1 << i;
136 ds->phys_port_mask |= 1 << i;
138 valid_name_found = true;
141 if (!valid_name_found && i == DSA_MAX_PORTS) {
146 /* Make the built-in MII bus mask match the number of ports,
147 * switch drivers can override this later
149 ds->phys_mii_mask = ds->phys_port_mask;
152 * If the CPU connects to this switch, set the switch tree
153 * tagging protocol to the preferred tagging format of this
156 if (dst->cpu_switch == index) {
157 switch (drv->tag_protocol) {
158 #ifdef CONFIG_NET_DSA_TAG_DSA
159 case DSA_TAG_PROTO_DSA:
160 dst->rcv = dsa_netdev_ops.rcv;
163 #ifdef CONFIG_NET_DSA_TAG_EDSA
164 case DSA_TAG_PROTO_EDSA:
165 dst->rcv = edsa_netdev_ops.rcv;
168 #ifdef CONFIG_NET_DSA_TAG_TRAILER
169 case DSA_TAG_PROTO_TRAILER:
170 dst->rcv = trailer_netdev_ops.rcv;
173 #ifdef CONFIG_NET_DSA_TAG_BRCM
174 case DSA_TAG_PROTO_BRCM:
175 dst->rcv = brcm_netdev_ops.rcv;
182 dst->tag_protocol = drv->tag_protocol;
186 * Do basic register setup.
188 ret = drv->setup(ds);
192 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
196 ds->slave_mii_bus = mdiobus_alloc();
197 if (ds->slave_mii_bus == NULL) {
201 dsa_slave_mii_bus_init(ds);
203 ret = mdiobus_register(ds->slave_mii_bus);
209 * Create network devices for physical switch ports.
211 for (i = 0; i < DSA_MAX_PORTS; i++) {
212 struct net_device *slave_dev;
214 if (!(ds->phys_port_mask & (1 << i)))
217 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
218 if (slave_dev == NULL) {
219 printk(KERN_ERR "%s[%d]: can't create dsa "
220 "slave device for port %d(%s)\n",
221 dst->master_netdev->name,
222 index, i, pd->port_names[i]);
226 ds->ports[i] = slave_dev;
232 mdiobus_free(ds->slave_mii_bus);
238 static void dsa_switch_destroy(struct dsa_switch *ds)
243 /* link polling *************************************************************/
244 static void dsa_link_poll_work(struct work_struct *ugly)
246 struct dsa_switch_tree *dst;
249 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
251 for (i = 0; i < dst->pd->nr_chips; i++) {
252 struct dsa_switch *ds = dst->ds[i];
254 if (ds != NULL && ds->drv->poll_link != NULL)
255 ds->drv->poll_link(ds);
258 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
261 static void dsa_link_poll_timer(unsigned long _dst)
263 struct dsa_switch_tree *dst = (void *)_dst;
265 schedule_work(&dst->link_poll_work);
269 /* platform driver init and cleanup *****************************************/
270 static int dev_is_class(struct device *dev, void *class)
272 if (dev->class != NULL && !strcmp(dev->class->name, class))
278 static struct device *dev_find_class(struct device *parent, char *class)
280 if (dev_is_class(parent, class)) {
285 return device_find_child(parent, class, dev_is_class);
288 static struct mii_bus *dev_to_mii_bus(struct device *dev)
292 d = dev_find_class(dev, "mdio_bus");
305 static struct net_device *dev_to_net_device(struct device *dev)
309 d = dev_find_class(dev, "net");
311 struct net_device *nd;
324 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
325 struct dsa_chip_data *cd,
327 struct device_node *link)
333 struct device_node *parent_sw;
336 parent_sw = of_get_parent(link);
340 reg = of_get_property(parent_sw, "reg", &len);
341 if (!reg || (len != sizeof(*reg) * 2))
344 link_sw_addr = be32_to_cpup(reg + 1);
346 if (link_sw_addr >= pd->nr_chips)
349 /* First time routing table allocation */
351 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
355 /* default to no valid uplink/downlink */
356 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
359 reg = of_get_property(link, "reg", NULL);
365 link_port_addr = be32_to_cpup(reg);
367 cd->rtable[link_sw_addr] = link_port_addr;
375 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
380 for (i = 0; i < pd->nr_chips; i++) {
382 while (port_index < DSA_MAX_PORTS) {
383 kfree(pd->chip[i].port_names[port_index]);
386 kfree(pd->chip[i].rtable);
391 static int dsa_of_probe(struct platform_device *pdev)
393 struct device_node *np = pdev->dev.of_node;
394 struct device_node *child, *mdio, *ethernet, *port, *link;
395 struct mii_bus *mdio_bus;
396 struct platform_device *ethernet_dev;
397 struct dsa_platform_data *pd;
398 struct dsa_chip_data *cd;
399 const char *port_name;
400 int chip_index, port_index;
401 const unsigned int *sw_addr, *port_reg;
404 mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
408 mdio_bus = of_mdio_find_bus(mdio);
412 ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
416 ethernet_dev = of_find_device_by_node(ethernet);
420 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
424 pdev->dev.platform_data = pd;
425 pd->netdev = ðernet_dev->dev;
426 pd->nr_chips = of_get_child_count(np);
427 if (pd->nr_chips > DSA_MAX_SWITCHES)
428 pd->nr_chips = DSA_MAX_SWITCHES;
430 pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
438 for_each_available_child_of_node(np, child) {
440 cd = &pd->chip[chip_index];
443 cd->mii_bus = &mdio_bus->dev;
445 sw_addr = of_get_property(child, "reg", NULL);
449 cd->sw_addr = be32_to_cpup(sw_addr);
450 if (cd->sw_addr > PHY_MAX_ADDR)
453 for_each_available_child_of_node(child, port) {
454 port_reg = of_get_property(port, "reg", NULL);
458 port_index = be32_to_cpup(port_reg);
460 port_name = of_get_property(port, "label", NULL);
464 cd->port_dn[port_index] = port;
466 cd->port_names[port_index] = kstrdup(port_name,
468 if (!cd->port_names[port_index]) {
473 link = of_parse_phandle(port, "link", 0);
475 if (!strcmp(port_name, "dsa") && link &&
477 ret = dsa_of_setup_routing_table(pd, cd,
483 if (port_index == DSA_MAX_PORTS)
491 dsa_of_free_platform_data(pd);
494 pdev->dev.platform_data = NULL;
498 static void dsa_of_remove(struct platform_device *pdev)
500 struct dsa_platform_data *pd = pdev->dev.platform_data;
502 if (!pdev->dev.of_node)
505 dsa_of_free_platform_data(pd);
509 static inline int dsa_of_probe(struct platform_device *pdev)
514 static inline void dsa_of_remove(struct platform_device *pdev)
519 static int dsa_probe(struct platform_device *pdev)
521 static int dsa_version_printed;
522 struct dsa_platform_data *pd = pdev->dev.platform_data;
523 struct net_device *dev;
524 struct dsa_switch_tree *dst;
527 if (!dsa_version_printed++)
528 printk(KERN_NOTICE "Distributed Switch Architecture "
529 "driver version %s\n", dsa_driver_version);
531 if (pdev->dev.of_node) {
532 ret = dsa_of_probe(pdev);
536 pd = pdev->dev.platform_data;
539 if (pd == NULL || pd->netdev == NULL)
542 dev = dev_to_net_device(pd->netdev);
548 if (dev->dsa_ptr != NULL) {
554 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
561 platform_set_drvdata(pdev, dst);
564 dst->master_netdev = dev;
565 dst->cpu_switch = -1;
568 for (i = 0; i < pd->nr_chips; i++) {
570 struct dsa_switch *ds;
572 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
574 printk(KERN_ERR "%s[%d]: no mii bus found for "
575 "dsa switch\n", dev->name, i);
579 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
581 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
582 "instance (error %ld)\n", dev->name, i,
588 if (ds->drv->poll_link != NULL)
589 dst->link_poll_needed = 1;
593 * If we use a tagging format that doesn't have an ethertype
594 * field, make sure that all packets from this point on get
595 * sent to the tag format's receive function.
598 dev->dsa_ptr = (void *)dst;
600 if (dst->link_poll_needed) {
601 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
602 init_timer(&dst->link_poll_timer);
603 dst->link_poll_timer.data = (unsigned long)dst;
604 dst->link_poll_timer.function = dsa_link_poll_timer;
605 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
606 add_timer(&dst->link_poll_timer);
617 static int dsa_remove(struct platform_device *pdev)
619 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
622 if (dst->link_poll_needed)
623 del_timer_sync(&dst->link_poll_timer);
625 flush_work(&dst->link_poll_work);
627 for (i = 0; i < dst->pd->nr_chips; i++) {
628 struct dsa_switch *ds = dst->ds[i];
631 dsa_switch_destroy(ds);
639 static void dsa_shutdown(struct platform_device *pdev)
643 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
644 struct packet_type *pt, struct net_device *orig_dev)
646 struct dsa_switch_tree *dst = dev->dsa_ptr;
648 if (unlikely(dst == NULL)) {
653 return dst->rcv(skb, dev, pt, orig_dev);
656 static struct packet_type dsa_pack_type __read_mostly = {
657 .type = cpu_to_be16(ETH_P_XDSA),
658 .func = dsa_switch_rcv,
661 static const struct of_device_id dsa_of_match_table[] = {
662 { .compatible = "brcm,bcm7445-switch-v4.0" },
663 { .compatible = "marvell,dsa", },
666 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
668 static struct platform_driver dsa_driver = {
670 .remove = dsa_remove,
671 .shutdown = dsa_shutdown,
674 .owner = THIS_MODULE,
675 .of_match_table = dsa_of_match_table,
679 static int __init dsa_init_module(void)
683 rc = platform_driver_register(&dsa_driver);
687 dev_add_pack(&dsa_pack_type);
691 module_init(dsa_init_module);
693 static void __exit dsa_cleanup_module(void)
695 dev_remove_pack(&dsa_pack_type);
696 platform_driver_unregister(&dsa_driver);
698 module_exit(dsa_cleanup_module);
700 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
701 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
702 MODULE_LICENSE("GPL");
703 MODULE_ALIAS("platform:dsa");