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>
24 struct dsa_loop_vlan {
29 #define DSA_LOOP_VLANS 5
31 struct dsa_loop_priv {
33 unsigned int port_base;
34 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
35 struct net_device *netdev;
39 static struct phy_device *phydevs[PHY_MAX_ADDR];
41 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds)
43 dev_dbg(ds->dev, "%s\n", __func__);
45 return DSA_TAG_PROTO_NONE;
48 static int dsa_loop_setup(struct dsa_switch *ds)
50 dev_dbg(ds->dev, "%s\n", __func__);
55 static int dsa_loop_set_addr(struct dsa_switch *ds, u8 *addr)
57 dev_dbg(ds->dev, "%s\n", __func__);
62 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
64 struct dsa_loop_priv *ps = ds->priv;
65 struct mii_bus *bus = ps->bus;
67 dev_dbg(ds->dev, "%s\n", __func__);
69 return mdiobus_read_nested(bus, ps->port_base + port, regnum);
72 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
73 int regnum, u16 value)
75 struct dsa_loop_priv *ps = ds->priv;
76 struct mii_bus *bus = ps->bus;
78 dev_dbg(ds->dev, "%s\n", __func__);
80 return mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
83 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
84 struct net_device *bridge)
86 dev_dbg(ds->dev, "%s\n", __func__);
91 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
92 struct net_device *bridge)
94 dev_dbg(ds->dev, "%s\n", __func__);
97 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
100 dev_dbg(ds->dev, "%s\n", __func__);
103 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
106 dev_dbg(ds->dev, "%s\n", __func__);
111 static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
112 const struct switchdev_obj_port_vlan *vlan,
113 struct switchdev_trans *trans)
115 struct dsa_loop_priv *ps = ds->priv;
116 struct mii_bus *bus = ps->bus;
118 dev_dbg(ds->dev, "%s\n", __func__);
120 /* Just do a sleeping operation to make lockdep checks effective */
121 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
123 if (vlan->vid_end > DSA_LOOP_VLANS)
129 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
130 const struct switchdev_obj_port_vlan *vlan,
131 struct switchdev_trans *trans)
133 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
134 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
135 struct dsa_loop_priv *ps = ds->priv;
136 struct mii_bus *bus = ps->bus;
137 struct dsa_loop_vlan *vl;
140 dev_dbg(ds->dev, "%s\n", __func__);
142 /* Just do a sleeping operation to make lockdep checks effective */
143 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
145 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
146 vl = &ps->vlans[vid];
148 vl->members |= BIT(port);
150 vl->untagged |= BIT(port);
152 vl->untagged &= ~BIT(port);
159 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
160 const struct switchdev_obj_port_vlan *vlan)
162 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
163 struct dsa_loop_priv *ps = ds->priv;
164 struct mii_bus *bus = ps->bus;
165 struct dsa_loop_vlan *vl;
166 u16 vid, pvid = ps->pvid;
168 dev_dbg(ds->dev, "%s\n", __func__);
170 /* Just do a sleeping operation to make lockdep checks effective */
171 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
173 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
174 vl = &ps->vlans[vid];
176 vl->members &= ~BIT(port);
178 vl->untagged &= ~BIT(port);
188 static int dsa_loop_port_vlan_dump(struct dsa_switch *ds, int port,
189 struct switchdev_obj_port_vlan *vlan,
190 switchdev_obj_dump_cb_t *cb)
192 struct dsa_loop_priv *ps = ds->priv;
193 struct mii_bus *bus = ps->bus;
194 struct dsa_loop_vlan *vl;
195 u16 vid, vid_start = 0;
198 dev_dbg(ds->dev, "%s\n", __func__);
200 /* Just do a sleeping operation to make lockdep checks effective */
201 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
203 for (vid = vid_start; vid < DSA_LOOP_VLANS; vid++) {
204 vl = &ps->vlans[vid];
206 if (!(vl->members & BIT(port)))
209 vlan->vid_begin = vlan->vid_end = vid;
212 if (vl->untagged & BIT(port))
213 vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
215 vlan->flags |= BRIDGE_VLAN_INFO_PVID;
217 err = cb(&vlan->obj);
225 static struct dsa_switch_ops dsa_loop_driver = {
226 .get_tag_protocol = dsa_loop_get_protocol,
227 .setup = dsa_loop_setup,
228 .set_addr = dsa_loop_set_addr,
229 .phy_read = dsa_loop_phy_read,
230 .phy_write = dsa_loop_phy_write,
231 .port_bridge_join = dsa_loop_port_bridge_join,
232 .port_bridge_leave = dsa_loop_port_bridge_leave,
233 .port_stp_state_set = dsa_loop_port_stp_state_set,
234 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
235 .port_vlan_prepare = dsa_loop_port_vlan_prepare,
236 .port_vlan_add = dsa_loop_port_vlan_add,
237 .port_vlan_del = dsa_loop_port_vlan_del,
238 .port_vlan_dump = dsa_loop_port_vlan_dump,
241 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
243 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
244 struct dsa_loop_priv *ps;
245 struct dsa_switch *ds;
250 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
251 pdata->name, pdata->enabled_ports);
253 ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
257 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
261 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
263 return -EPROBE_DEFER;
265 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
267 ds->dev = &mdiodev->dev;
268 ds->ops = &dsa_loop_driver;
270 ps->bus = mdiodev->bus;
272 dev_set_drvdata(&mdiodev->dev, ds);
274 return dsa_register_switch(ds);
277 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
279 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
280 struct dsa_loop_priv *ps = ds->priv;
282 dsa_unregister_switch(ds);
286 static struct mdio_driver dsa_loop_drv = {
290 .probe = dsa_loop_drv_probe,
291 .remove = dsa_loop_drv_remove,
294 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
296 static int __init dsa_loop_init(void)
298 struct fixed_phy_status status = {
301 .duplex = DUPLEX_FULL,
305 for (i = 0; i < NUM_FIXED_PHYS; i++)
306 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
308 return mdio_driver_register(&dsa_loop_drv);
310 module_init(dsa_loop_init);
312 static void __exit dsa_loop_exit(void)
316 mdio_driver_unregister(&dsa_loop_drv);
317 for (i = 0; i < NUM_FIXED_PHYS; i++)
319 fixed_phy_unregister(phydevs[i]);
321 module_exit(dsa_loop_exit);
323 MODULE_LICENSE("GPL");
324 MODULE_AUTHOR("Florian Fainelli");
325 MODULE_DESCRIPTION("DSA loopback driver");