2 * Distributed Switch Architecture loopback driver
4 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
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/platform_device.h>
13 #include <linux/netdevice.h>
14 #include <linux/phy.h>
15 #include <linux/phy_fixed.h>
16 #include <linux/export.h>
17 #include <linux/workqueue.h>
18 #include <linux/module.h>
19 #include <linux/if_bridge.h>
20 #include <net/switchdev.h>
25 struct dsa_loop_vlan {
30 #define DSA_LOOP_VLANS 5
32 struct dsa_loop_priv {
34 unsigned int port_base;
35 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
36 struct net_device *netdev;
40 static struct phy_device *phydevs[PHY_MAX_ADDR];
42 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds)
44 dev_dbg(ds->dev, "%s\n", __func__);
46 return DSA_TAG_PROTO_NONE;
49 static int dsa_loop_setup(struct dsa_switch *ds)
51 dev_dbg(ds->dev, "%s\n", __func__);
56 static int dsa_loop_set_addr(struct dsa_switch *ds, u8 *addr)
58 dev_dbg(ds->dev, "%s\n", __func__);
63 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
65 struct dsa_loop_priv *ps = ds->priv;
66 struct mii_bus *bus = ps->bus;
68 dev_dbg(ds->dev, "%s\n", __func__);
70 return mdiobus_read_nested(bus, ps->port_base + port, regnum);
73 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
74 int regnum, u16 value)
76 struct dsa_loop_priv *ps = ds->priv;
77 struct mii_bus *bus = ps->bus;
79 dev_dbg(ds->dev, "%s\n", __func__);
81 return mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
84 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
85 struct net_device *bridge)
87 dev_dbg(ds->dev, "%s\n", __func__);
92 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
93 struct net_device *bridge)
95 dev_dbg(ds->dev, "%s\n", __func__);
98 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
101 dev_dbg(ds->dev, "%s\n", __func__);
104 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
107 dev_dbg(ds->dev, "%s\n", __func__);
112 static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
113 const struct switchdev_obj_port_vlan *vlan,
114 struct switchdev_trans *trans)
116 struct dsa_loop_priv *ps = ds->priv;
117 struct mii_bus *bus = ps->bus;
119 dev_dbg(ds->dev, "%s\n", __func__);
121 /* Just do a sleeping operation to make lockdep checks effective */
122 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
124 if (vlan->vid_end > DSA_LOOP_VLANS)
130 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
131 const struct switchdev_obj_port_vlan *vlan,
132 struct switchdev_trans *trans)
134 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
135 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
136 struct dsa_loop_priv *ps = ds->priv;
137 struct mii_bus *bus = ps->bus;
138 struct dsa_loop_vlan *vl;
141 dev_dbg(ds->dev, "%s\n", __func__);
143 /* Just do a sleeping operation to make lockdep checks effective */
144 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
146 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
147 vl = &ps->vlans[vid];
149 vl->members |= BIT(port);
151 vl->untagged |= BIT(port);
153 vl->untagged &= ~BIT(port);
160 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
161 const struct switchdev_obj_port_vlan *vlan)
163 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
164 struct dsa_loop_priv *ps = ds->priv;
165 struct mii_bus *bus = ps->bus;
166 struct dsa_loop_vlan *vl;
167 u16 vid, pvid = ps->pvid;
169 dev_dbg(ds->dev, "%s\n", __func__);
171 /* Just do a sleeping operation to make lockdep checks effective */
172 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
174 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
175 vl = &ps->vlans[vid];
177 vl->members &= ~BIT(port);
179 vl->untagged &= ~BIT(port);
189 static int dsa_loop_port_vlan_dump(struct dsa_switch *ds, int port,
190 struct switchdev_obj_port_vlan *vlan,
191 int (*cb)(struct switchdev_obj *obj))
193 struct dsa_loop_priv *ps = ds->priv;
194 struct mii_bus *bus = ps->bus;
195 struct dsa_loop_vlan *vl;
196 u16 vid, vid_start = 0;
199 dev_dbg(ds->dev, "%s\n", __func__);
201 /* Just do a sleeping operation to make lockdep checks effective */
202 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
204 for (vid = vid_start; vid < DSA_LOOP_VLANS; vid++) {
205 vl = &ps->vlans[vid];
207 if (!(vl->members & BIT(port)))
210 vlan->vid_begin = vlan->vid_end = vid;
213 if (vl->untagged & BIT(port))
214 vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
216 vlan->flags |= BRIDGE_VLAN_INFO_PVID;
218 err = cb(&vlan->obj);
226 static struct dsa_switch_ops dsa_loop_driver = {
227 .get_tag_protocol = dsa_loop_get_protocol,
228 .setup = dsa_loop_setup,
229 .set_addr = dsa_loop_set_addr,
230 .phy_read = dsa_loop_phy_read,
231 .phy_write = dsa_loop_phy_write,
232 .port_bridge_join = dsa_loop_port_bridge_join,
233 .port_bridge_leave = dsa_loop_port_bridge_leave,
234 .port_stp_state_set = dsa_loop_port_stp_state_set,
235 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
236 .port_vlan_prepare = dsa_loop_port_vlan_prepare,
237 .port_vlan_add = dsa_loop_port_vlan_add,
238 .port_vlan_del = dsa_loop_port_vlan_del,
239 .port_vlan_dump = dsa_loop_port_vlan_dump,
242 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
244 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
245 struct dsa_loop_priv *ps;
246 struct dsa_switch *ds;
251 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
252 pdata->name, pdata->enabled_ports);
254 ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
258 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
259 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
261 return -EPROBE_DEFER;
263 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
265 ds->dev = &mdiodev->dev;
266 ds->ops = &dsa_loop_driver;
268 ps->bus = mdiodev->bus;
270 dev_set_drvdata(&mdiodev->dev, ds);
272 return dsa_register_switch(ds, ds->dev);
275 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
277 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
278 struct dsa_loop_priv *ps = ds->priv;
280 dsa_unregister_switch(ds);
284 static struct mdio_driver dsa_loop_drv = {
288 .probe = dsa_loop_drv_probe,
289 .remove = dsa_loop_drv_remove,
292 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
294 static void unregister_fixed_phys(void)
298 for (i = 0; i < NUM_FIXED_PHYS; i++)
300 fixed_phy_unregister(phydevs[i]);
303 static int __init dsa_loop_init(void)
305 struct fixed_phy_status status = {
308 .duplex = DUPLEX_FULL,
312 for (i = 0; i < NUM_FIXED_PHYS; i++)
313 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
315 return mdio_driver_register(&dsa_loop_drv);
317 module_init(dsa_loop_init);
319 static void __exit dsa_loop_exit(void)
321 mdio_driver_unregister(&dsa_loop_drv);
322 unregister_fixed_phys();
324 module_exit(dsa_loop_exit);
326 MODULE_LICENSE("GPL");
327 MODULE_AUTHOR("Florian Fainelli");
328 MODULE_DESCRIPTION("DSA loopback driver");