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/device.h>
13 #include <linux/list.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
18 #include <linux/of_mdio.h>
19 #include <linux/of_platform.h>
20 #include <linux/of_net.h>
21 #include <linux/of_gpio.h>
22 #include <linux/netdevice.h>
23 #include <linux/sysfs.h>
24 #include <linux/phy_fixed.h>
25 #include <linux/gpio/consumer.h>
26 #include <linux/etherdevice.h>
30 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
31 struct net_device *dev)
33 /* Just return the original SKB */
37 static const struct dsa_device_ops none_ops = {
38 .xmit = dsa_slave_notag_xmit,
42 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
43 #ifdef CONFIG_NET_DSA_TAG_BRCM
44 [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
46 #ifdef CONFIG_NET_DSA_TAG_DSA
47 [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
49 #ifdef CONFIG_NET_DSA_TAG_EDSA
50 [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
52 #ifdef CONFIG_NET_DSA_TAG_KSZ
53 [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
55 #ifdef CONFIG_NET_DSA_TAG_LAN9303
56 [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
58 #ifdef CONFIG_NET_DSA_TAG_MTK
59 [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
61 #ifdef CONFIG_NET_DSA_TAG_QCA
62 [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
64 #ifdef CONFIG_NET_DSA_TAG_TRAILER
65 [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
67 [DSA_TAG_PROTO_NONE] = &none_ops,
70 int dsa_cpu_dsa_setup(struct dsa_port *port)
72 struct device_node *port_dn = port->dn;
73 struct dsa_switch *ds = port->ds;
74 struct phy_device *phydev;
77 if (of_phy_is_fixed_link(port_dn)) {
78 ret = of_phy_register_fixed_link(port_dn);
80 dev_err(ds->dev, "failed to register fixed PHY\n");
83 phydev = of_phy_find_device(port_dn);
85 mode = of_get_phy_mode(port_dn);
87 mode = PHY_INTERFACE_MODE_NA;
88 phydev->interface = mode;
90 genphy_config_init(phydev);
91 genphy_read_status(phydev);
92 if (ds->ops->adjust_link)
93 ds->ops->adjust_link(ds, port->index, phydev);
95 put_device(&phydev->mdio.dev);
101 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
103 const struct dsa_device_ops *ops;
105 if (tag_protocol >= DSA_TAG_LAST)
106 return ERR_PTR(-EINVAL);
107 ops = dsa_device_ops[tag_protocol];
110 return ERR_PTR(-ENOPROTOOPT);
115 void dsa_cpu_dsa_destroy(struct dsa_port *port)
117 struct device_node *port_dn = port->dn;
119 if (of_phy_is_fixed_link(port_dn))
120 of_phy_deregister_fixed_link(port_dn);
123 static int dev_is_class(struct device *dev, void *class)
125 if (dev->class != NULL && !strcmp(dev->class->name, class))
131 static struct device *dev_find_class(struct device *parent, char *class)
133 if (dev_is_class(parent, class)) {
138 return device_find_child(parent, class, dev_is_class);
141 struct net_device *dsa_dev_to_net_device(struct device *dev)
145 d = dev_find_class(dev, "net");
147 struct net_device *nd;
158 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
160 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
161 struct packet_type *pt, struct net_device *unused)
163 struct dsa_switch_tree *dst = dev->dsa_ptr;
164 struct sk_buff *nskb = NULL;
165 struct pcpu_sw_netstats *s;
166 struct dsa_slave_priv *p;
168 if (unlikely(dst == NULL)) {
173 skb = skb_unshare(skb, GFP_ATOMIC);
177 nskb = dst->rcv(skb, dev, pt);
184 p = netdev_priv(skb->dev);
185 skb_push(skb, ETH_HLEN);
186 skb->pkt_type = PACKET_HOST;
187 skb->protocol = eth_type_trans(skb, skb->dev);
189 s = this_cpu_ptr(p->stats64);
190 u64_stats_update_begin(&s->syncp);
192 s->rx_bytes += skb->len;
193 u64_stats_update_end(&s->syncp);
195 netif_receive_skb(skb);
200 #ifdef CONFIG_PM_SLEEP
201 static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
203 return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
206 int dsa_switch_suspend(struct dsa_switch *ds)
210 /* Suspend slave network devices */
211 for (i = 0; i < ds->num_ports; i++) {
212 if (!dsa_is_port_initialized(ds, i))
215 ret = dsa_slave_suspend(ds->ports[i].netdev);
220 if (ds->ops->suspend)
221 ret = ds->ops->suspend(ds);
225 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
227 int dsa_switch_resume(struct dsa_switch *ds)
232 ret = ds->ops->resume(ds);
237 /* Resume slave network devices */
238 for (i = 0; i < ds->num_ports; i++) {
239 if (!dsa_is_port_initialized(ds, i))
242 ret = dsa_slave_resume(ds->ports[i].netdev);
249 EXPORT_SYMBOL_GPL(dsa_switch_resume);
252 static struct packet_type dsa_pack_type __read_mostly = {
253 .type = cpu_to_be16(ETH_P_XDSA),
254 .func = dsa_switch_rcv,
257 static struct workqueue_struct *dsa_owq;
259 bool dsa_schedule_work(struct work_struct *work)
261 return queue_work(dsa_owq, work);
264 static int __init dsa_init_module(void)
268 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
273 rc = dsa_slave_register_notifier();
277 rc = dsa_legacy_register();
281 dev_add_pack(&dsa_pack_type);
285 module_init(dsa_init_module);
287 static void __exit dsa_cleanup_module(void)
289 dsa_slave_unregister_notifier();
290 dev_remove_pack(&dsa_pack_type);
291 dsa_legacy_unregister();
292 destroy_workqueue(dsa_owq);
294 module_exit(dsa_cleanup_module);
296 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
297 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
298 MODULE_LICENSE("GPL");
299 MODULE_ALIAS("platform:dsa");