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 device *host_dev, 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(host_dev, 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 device *host_dev)
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(host_dev, 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_dev = host_dev;
115 * Validate supplied switch configuration.
117 for (i = 0; i < DSA_MAX_PORTS; i++) {
120 name = pd->port_names[i];
124 if (!strcmp(name, "cpu")) {
125 if (dst->cpu_switch != -1) {
126 printk(KERN_ERR "multiple cpu ports?!\n");
130 dst->cpu_switch = index;
132 } else if (!strcmp(name, "dsa")) {
133 ds->dsa_port_mask |= 1 << i;
135 ds->phys_port_mask |= 1 << i;
137 valid_name_found = true;
140 if (!valid_name_found && i == DSA_MAX_PORTS) {
145 /* Make the built-in MII bus mask match the number of ports,
146 * switch drivers can override this later
148 ds->phys_mii_mask = ds->phys_port_mask;
151 * If the CPU connects to this switch, set the switch tree
152 * tagging protocol to the preferred tagging format of this
155 if (dst->cpu_switch == index) {
156 switch (drv->tag_protocol) {
157 #ifdef CONFIG_NET_DSA_TAG_DSA
158 case DSA_TAG_PROTO_DSA:
159 dst->rcv = dsa_netdev_ops.rcv;
162 #ifdef CONFIG_NET_DSA_TAG_EDSA
163 case DSA_TAG_PROTO_EDSA:
164 dst->rcv = edsa_netdev_ops.rcv;
167 #ifdef CONFIG_NET_DSA_TAG_TRAILER
168 case DSA_TAG_PROTO_TRAILER:
169 dst->rcv = trailer_netdev_ops.rcv;
172 #ifdef CONFIG_NET_DSA_TAG_BRCM
173 case DSA_TAG_PROTO_BRCM:
174 dst->rcv = brcm_netdev_ops.rcv;
181 dst->tag_protocol = drv->tag_protocol;
185 * Do basic register setup.
187 ret = drv->setup(ds);
191 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
195 ds->slave_mii_bus = mdiobus_alloc();
196 if (ds->slave_mii_bus == NULL) {
200 dsa_slave_mii_bus_init(ds);
202 ret = mdiobus_register(ds->slave_mii_bus);
208 * Create network devices for physical switch ports.
210 for (i = 0; i < DSA_MAX_PORTS; i++) {
211 struct net_device *slave_dev;
213 if (!(ds->phys_port_mask & (1 << i)))
216 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
217 if (slave_dev == NULL) {
218 printk(KERN_ERR "%s[%d]: can't create dsa "
219 "slave device for port %d(%s)\n",
220 dst->master_netdev->name,
221 index, i, pd->port_names[i]);
225 ds->ports[i] = slave_dev;
231 mdiobus_free(ds->slave_mii_bus);
237 static void dsa_switch_destroy(struct dsa_switch *ds)
241 #ifdef CONFIG_PM_SLEEP
242 static int dsa_switch_suspend(struct dsa_switch *ds)
246 /* Suspend slave network devices */
247 for (i = 0; i < DSA_MAX_PORTS; i++) {
248 if (!(ds->phys_port_mask & (1 << i)))
251 ret = dsa_slave_suspend(ds->ports[i]);
256 if (ds->drv->suspend)
257 ret = ds->drv->suspend(ds);
262 static int dsa_switch_resume(struct dsa_switch *ds)
267 ret = ds->drv->resume(ds);
272 /* Resume slave network devices */
273 for (i = 0; i < DSA_MAX_PORTS; i++) {
274 if (!(ds->phys_port_mask & (1 << i)))
277 ret = dsa_slave_resume(ds->ports[i]);
287 /* link polling *************************************************************/
288 static void dsa_link_poll_work(struct work_struct *ugly)
290 struct dsa_switch_tree *dst;
293 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
295 for (i = 0; i < dst->pd->nr_chips; i++) {
296 struct dsa_switch *ds = dst->ds[i];
298 if (ds != NULL && ds->drv->poll_link != NULL)
299 ds->drv->poll_link(ds);
302 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
305 static void dsa_link_poll_timer(unsigned long _dst)
307 struct dsa_switch_tree *dst = (void *)_dst;
309 schedule_work(&dst->link_poll_work);
313 /* platform driver init and cleanup *****************************************/
314 static int dev_is_class(struct device *dev, void *class)
316 if (dev->class != NULL && !strcmp(dev->class->name, class))
322 static struct device *dev_find_class(struct device *parent, char *class)
324 if (dev_is_class(parent, class)) {
329 return device_find_child(parent, class, dev_is_class);
332 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
336 d = dev_find_class(dev, "mdio_bus");
348 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
350 static struct net_device *dev_to_net_device(struct device *dev)
354 d = dev_find_class(dev, "net");
356 struct net_device *nd;
369 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
370 struct dsa_chip_data *cd,
372 struct device_node *link)
378 struct device_node *parent_sw;
381 parent_sw = of_get_parent(link);
385 reg = of_get_property(parent_sw, "reg", &len);
386 if (!reg || (len != sizeof(*reg) * 2))
389 link_sw_addr = be32_to_cpup(reg + 1);
391 if (link_sw_addr >= pd->nr_chips)
394 /* First time routing table allocation */
396 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
400 /* default to no valid uplink/downlink */
401 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
404 reg = of_get_property(link, "reg", NULL);
410 link_port_addr = be32_to_cpup(reg);
412 cd->rtable[link_sw_addr] = link_port_addr;
420 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
425 for (i = 0; i < pd->nr_chips; i++) {
427 while (port_index < DSA_MAX_PORTS) {
428 kfree(pd->chip[i].port_names[port_index]);
431 kfree(pd->chip[i].rtable);
436 static int dsa_of_probe(struct platform_device *pdev)
438 struct device_node *np = pdev->dev.of_node;
439 struct device_node *child, *mdio, *ethernet, *port, *link;
440 struct mii_bus *mdio_bus;
441 struct platform_device *ethernet_dev;
442 struct dsa_platform_data *pd;
443 struct dsa_chip_data *cd;
444 const char *port_name;
445 int chip_index, port_index;
446 const unsigned int *sw_addr, *port_reg;
449 mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
453 mdio_bus = of_mdio_find_bus(mdio);
457 ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
461 ethernet_dev = of_find_device_by_node(ethernet);
465 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
469 pdev->dev.platform_data = pd;
470 pd->netdev = ðernet_dev->dev;
471 pd->nr_chips = of_get_child_count(np);
472 if (pd->nr_chips > DSA_MAX_SWITCHES)
473 pd->nr_chips = DSA_MAX_SWITCHES;
475 pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
483 for_each_available_child_of_node(np, child) {
485 cd = &pd->chip[chip_index];
488 cd->host_dev = &mdio_bus->dev;
490 sw_addr = of_get_property(child, "reg", NULL);
494 cd->sw_addr = be32_to_cpup(sw_addr);
495 if (cd->sw_addr > PHY_MAX_ADDR)
498 for_each_available_child_of_node(child, port) {
499 port_reg = of_get_property(port, "reg", NULL);
503 port_index = be32_to_cpup(port_reg);
505 port_name = of_get_property(port, "label", NULL);
509 cd->port_dn[port_index] = port;
511 cd->port_names[port_index] = kstrdup(port_name,
513 if (!cd->port_names[port_index]) {
518 link = of_parse_phandle(port, "link", 0);
520 if (!strcmp(port_name, "dsa") && link &&
522 ret = dsa_of_setup_routing_table(pd, cd,
528 if (port_index == DSA_MAX_PORTS)
536 dsa_of_free_platform_data(pd);
539 pdev->dev.platform_data = NULL;
543 static void dsa_of_remove(struct platform_device *pdev)
545 struct dsa_platform_data *pd = pdev->dev.platform_data;
547 if (!pdev->dev.of_node)
550 dsa_of_free_platform_data(pd);
554 static inline int dsa_of_probe(struct platform_device *pdev)
559 static inline void dsa_of_remove(struct platform_device *pdev)
564 static int dsa_probe(struct platform_device *pdev)
566 static int dsa_version_printed;
567 struct dsa_platform_data *pd = pdev->dev.platform_data;
568 struct net_device *dev;
569 struct dsa_switch_tree *dst;
572 if (!dsa_version_printed++)
573 printk(KERN_NOTICE "Distributed Switch Architecture "
574 "driver version %s\n", dsa_driver_version);
576 if (pdev->dev.of_node) {
577 ret = dsa_of_probe(pdev);
581 pd = pdev->dev.platform_data;
584 if (pd == NULL || pd->netdev == NULL)
587 dev = dev_to_net_device(pd->netdev);
593 if (dev->dsa_ptr != NULL) {
599 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
606 platform_set_drvdata(pdev, dst);
609 dst->master_netdev = dev;
610 dst->cpu_switch = -1;
613 for (i = 0; i < pd->nr_chips; i++) {
614 struct dsa_switch *ds;
616 ds = dsa_switch_setup(dst, i, &pdev->dev, pd->chip[i].host_dev);
618 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
619 "instance (error %ld)\n", dev->name, i,
625 if (ds->drv->poll_link != NULL)
626 dst->link_poll_needed = 1;
630 * If we use a tagging format that doesn't have an ethertype
631 * field, make sure that all packets from this point on get
632 * sent to the tag format's receive function.
635 dev->dsa_ptr = (void *)dst;
637 if (dst->link_poll_needed) {
638 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
639 init_timer(&dst->link_poll_timer);
640 dst->link_poll_timer.data = (unsigned long)dst;
641 dst->link_poll_timer.function = dsa_link_poll_timer;
642 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
643 add_timer(&dst->link_poll_timer);
654 static int dsa_remove(struct platform_device *pdev)
656 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
659 if (dst->link_poll_needed)
660 del_timer_sync(&dst->link_poll_timer);
662 flush_work(&dst->link_poll_work);
664 for (i = 0; i < dst->pd->nr_chips; i++) {
665 struct dsa_switch *ds = dst->ds[i];
668 dsa_switch_destroy(ds);
676 static void dsa_shutdown(struct platform_device *pdev)
680 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
681 struct packet_type *pt, struct net_device *orig_dev)
683 struct dsa_switch_tree *dst = dev->dsa_ptr;
685 if (unlikely(dst == NULL)) {
690 return dst->rcv(skb, dev, pt, orig_dev);
693 static struct packet_type dsa_pack_type __read_mostly = {
694 .type = cpu_to_be16(ETH_P_XDSA),
695 .func = dsa_switch_rcv,
698 #ifdef CONFIG_PM_SLEEP
699 static int dsa_suspend(struct device *d)
701 struct platform_device *pdev = to_platform_device(d);
702 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
705 for (i = 0; i < dst->pd->nr_chips; i++) {
706 struct dsa_switch *ds = dst->ds[i];
709 ret = dsa_switch_suspend(ds);
715 static int dsa_resume(struct device *d)
717 struct platform_device *pdev = to_platform_device(d);
718 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
721 for (i = 0; i < dst->pd->nr_chips; i++) {
722 struct dsa_switch *ds = dst->ds[i];
725 ret = dsa_switch_resume(ds);
732 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
734 static const struct of_device_id dsa_of_match_table[] = {
735 { .compatible = "brcm,bcm7445-switch-v4.0" },
736 { .compatible = "marvell,dsa", },
739 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
741 static struct platform_driver dsa_driver = {
743 .remove = dsa_remove,
744 .shutdown = dsa_shutdown,
747 .owner = THIS_MODULE,
748 .of_match_table = dsa_of_match_table,
753 static int __init dsa_init_module(void)
757 rc = platform_driver_register(&dsa_driver);
761 dev_add_pack(&dsa_pack_type);
765 module_init(dsa_init_module);
767 static void __exit dsa_cleanup_module(void)
769 dev_remove_pack(&dsa_pack_type);
770 platform_driver_unregister(&dsa_driver);
772 module_exit(dsa_cleanup_module);
774 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
775 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
776 MODULE_LICENSE("GPL");
777 MODULE_ALIAS("platform:dsa");