2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
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>
17 #include <linux/notifier.h>
19 #include <linux/of_mdio.h>
20 #include <linux/of_platform.h>
21 #include <linux/of_net.h>
22 #include <linux/of_gpio.h>
23 #include <linux/netdevice.h>
24 #include <linux/sysfs.h>
25 #include <linux/phy_fixed.h>
26 #include <linux/gpio/consumer.h>
27 #include <linux/etherdevice.h>
31 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
32 struct net_device *dev)
34 /* Just return the original SKB */
38 static const struct dsa_device_ops none_ops = {
39 .xmit = dsa_slave_notag_xmit,
43 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
44 #ifdef CONFIG_NET_DSA_TAG_BRCM
45 [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
47 #ifdef CONFIG_NET_DSA_TAG_DSA
48 [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
50 #ifdef CONFIG_NET_DSA_TAG_EDSA
51 [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
53 #ifdef CONFIG_NET_DSA_TAG_KSZ
54 [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
56 #ifdef CONFIG_NET_DSA_TAG_LAN9303
57 [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
59 #ifdef CONFIG_NET_DSA_TAG_MTK
60 [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
62 #ifdef CONFIG_NET_DSA_TAG_QCA
63 [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
65 #ifdef CONFIG_NET_DSA_TAG_TRAILER
66 [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
68 [DSA_TAG_PROTO_NONE] = &none_ops,
71 int dsa_cpu_dsa_setup(struct dsa_port *port)
73 struct device_node *port_dn = port->dn;
74 struct dsa_switch *ds = port->ds;
75 struct phy_device *phydev;
78 if (of_phy_is_fixed_link(port_dn)) {
79 ret = of_phy_register_fixed_link(port_dn);
81 dev_err(ds->dev, "failed to register fixed PHY\n");
84 phydev = of_phy_find_device(port_dn);
86 mode = of_get_phy_mode(port_dn);
88 mode = PHY_INTERFACE_MODE_NA;
89 phydev->interface = mode;
91 genphy_config_init(phydev);
92 genphy_read_status(phydev);
93 if (ds->ops->adjust_link)
94 ds->ops->adjust_link(ds, port->index, phydev);
96 put_device(&phydev->mdio.dev);
102 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
104 const struct dsa_device_ops *ops;
106 if (tag_protocol >= DSA_TAG_LAST)
107 return ERR_PTR(-EINVAL);
108 ops = dsa_device_ops[tag_protocol];
111 return ERR_PTR(-ENOPROTOOPT);
116 void dsa_cpu_dsa_destroy(struct dsa_port *port)
118 struct device_node *port_dn = port->dn;
120 if (of_phy_is_fixed_link(port_dn))
121 of_phy_deregister_fixed_link(port_dn);
124 static int dev_is_class(struct device *dev, void *class)
126 if (dev->class != NULL && !strcmp(dev->class->name, class))
132 static struct device *dev_find_class(struct device *parent, char *class)
134 if (dev_is_class(parent, class)) {
139 return device_find_child(parent, class, dev_is_class);
142 struct net_device *dsa_dev_to_net_device(struct device *dev)
146 d = dev_find_class(dev, "net");
148 struct net_device *nd;
159 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
161 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
162 struct packet_type *pt, struct net_device *unused)
164 struct dsa_port *cpu_dp = dev->dsa_ptr;
165 struct sk_buff *nskb = NULL;
166 struct pcpu_sw_netstats *s;
167 struct dsa_slave_priv *p;
169 if (unlikely(!cpu_dp)) {
174 skb = skb_unshare(skb, GFP_ATOMIC);
178 nskb = cpu_dp->rcv(skb, dev, pt);
185 p = netdev_priv(skb->dev);
186 skb_push(skb, ETH_HLEN);
187 skb->pkt_type = PACKET_HOST;
188 skb->protocol = eth_type_trans(skb, skb->dev);
190 s = this_cpu_ptr(p->stats64);
191 u64_stats_update_begin(&s->syncp);
193 s->rx_bytes += skb->len;
194 u64_stats_update_end(&s->syncp);
196 netif_receive_skb(skb);
201 #ifdef CONFIG_PM_SLEEP
202 static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
204 return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
207 int dsa_switch_suspend(struct dsa_switch *ds)
211 /* Suspend slave network devices */
212 for (i = 0; i < ds->num_ports; i++) {
213 if (!dsa_is_port_initialized(ds, i))
216 ret = dsa_slave_suspend(ds->ports[i].netdev);
221 if (ds->ops->suspend)
222 ret = ds->ops->suspend(ds);
226 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
228 int dsa_switch_resume(struct dsa_switch *ds)
233 ret = ds->ops->resume(ds);
238 /* Resume slave network devices */
239 for (i = 0; i < ds->num_ports; i++) {
240 if (!dsa_is_port_initialized(ds, i))
243 ret = dsa_slave_resume(ds->ports[i].netdev);
250 EXPORT_SYMBOL_GPL(dsa_switch_resume);
253 static struct packet_type dsa_pack_type __read_mostly = {
254 .type = cpu_to_be16(ETH_P_XDSA),
255 .func = dsa_switch_rcv,
258 static struct workqueue_struct *dsa_owq;
260 bool dsa_schedule_work(struct work_struct *work)
262 return queue_work(dsa_owq, work);
265 static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);
267 int register_dsa_notifier(struct notifier_block *nb)
269 return atomic_notifier_chain_register(&dsa_notif_chain, nb);
271 EXPORT_SYMBOL_GPL(register_dsa_notifier);
273 int unregister_dsa_notifier(struct notifier_block *nb)
275 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
277 EXPORT_SYMBOL_GPL(unregister_dsa_notifier);
279 int call_dsa_notifiers(unsigned long val, struct net_device *dev,
280 struct dsa_notifier_info *info)
283 return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
285 EXPORT_SYMBOL_GPL(call_dsa_notifiers);
287 static int __init dsa_init_module(void)
291 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
296 rc = dsa_slave_register_notifier();
300 rc = dsa_legacy_register();
304 dev_add_pack(&dsa_pack_type);
308 module_init(dsa_init_module);
310 static void __exit dsa_cleanup_module(void)
312 dsa_slave_unregister_notifier();
313 dev_remove_pack(&dsa_pack_type);
314 dsa_legacy_unregister();
315 destroy_workqueue(dsa_owq);
317 module_exit(dsa_cleanup_module);
320 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
321 MODULE_LICENSE("GPL");
322 MODULE_ALIAS("platform:dsa");