Linux 4.16.11
[linux/fpc-iii.git] / drivers / net / dsa / dsa_loop.c
blob7aa84ee4e771d97b031e1e1e66910f81c1958828
1 /*
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/ethtool.h>
18 #include <linux/workqueue.h>
19 #include <linux/module.h>
20 #include <linux/if_bridge.h>
21 #include <net/dsa.h>
23 #include "dsa_loop.h"
25 struct dsa_loop_vlan {
26 u16 members;
27 u16 untagged;
30 struct dsa_loop_mib_entry {
31 char name[ETH_GSTRING_LEN];
32 unsigned long val;
35 enum dsa_loop_mib_counters {
36 DSA_LOOP_PHY_READ_OK,
37 DSA_LOOP_PHY_READ_ERR,
38 DSA_LOOP_PHY_WRITE_OK,
39 DSA_LOOP_PHY_WRITE_ERR,
40 __DSA_LOOP_CNT_MAX,
43 static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
44 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
45 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
46 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
47 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
50 struct dsa_loop_port {
51 struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
54 #define DSA_LOOP_VLANS 5
56 struct dsa_loop_priv {
57 struct mii_bus *bus;
58 unsigned int port_base;
59 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
60 struct net_device *netdev;
61 struct dsa_loop_port ports[DSA_MAX_PORTS];
62 u16 pvid;
65 static struct phy_device *phydevs[PHY_MAX_ADDR];
67 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
68 int port)
70 dev_dbg(ds->dev, "%s\n", __func__);
72 return DSA_TAG_PROTO_NONE;
75 static int dsa_loop_setup(struct dsa_switch *ds)
77 struct dsa_loop_priv *ps = ds->priv;
78 unsigned int i;
80 for (i = 0; i < ds->num_ports; i++)
81 memcpy(ps->ports[i].mib, dsa_loop_mibs,
82 sizeof(dsa_loop_mibs));
84 dev_dbg(ds->dev, "%s\n", __func__);
86 return 0;
89 static int dsa_loop_get_sset_count(struct dsa_switch *ds)
91 return __DSA_LOOP_CNT_MAX;
94 static void dsa_loop_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
96 struct dsa_loop_priv *ps = ds->priv;
97 unsigned int i;
99 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
100 memcpy(data + i * ETH_GSTRING_LEN,
101 ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
104 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
105 uint64_t *data)
107 struct dsa_loop_priv *ps = ds->priv;
108 unsigned int i;
110 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
111 data[i] = ps->ports[port].mib[i].val;
114 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
116 struct dsa_loop_priv *ps = ds->priv;
117 struct mii_bus *bus = ps->bus;
118 int ret;
120 dev_dbg(ds->dev, "%s\n", __func__);
122 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
123 if (ret < 0)
124 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
125 else
126 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
128 return ret;
131 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
132 int regnum, u16 value)
134 struct dsa_loop_priv *ps = ds->priv;
135 struct mii_bus *bus = ps->bus;
136 int ret;
138 dev_dbg(ds->dev, "%s\n", __func__);
140 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
141 if (ret < 0)
142 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
143 else
144 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
146 return ret;
149 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
150 struct net_device *bridge)
152 dev_dbg(ds->dev, "%s\n", __func__);
154 return 0;
157 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
158 struct net_device *bridge)
160 dev_dbg(ds->dev, "%s\n", __func__);
163 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
164 u8 state)
166 dev_dbg(ds->dev, "%s\n", __func__);
169 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
170 bool vlan_filtering)
172 dev_dbg(ds->dev, "%s\n", __func__);
174 return 0;
177 static int
178 dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
179 const struct switchdev_obj_port_vlan *vlan)
181 struct dsa_loop_priv *ps = ds->priv;
182 struct mii_bus *bus = ps->bus;
184 dev_dbg(ds->dev, "%s\n", __func__);
186 /* Just do a sleeping operation to make lockdep checks effective */
187 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
189 if (vlan->vid_end > DSA_LOOP_VLANS)
190 return -ERANGE;
192 return 0;
195 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
196 const struct switchdev_obj_port_vlan *vlan)
198 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
199 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
200 struct dsa_loop_priv *ps = ds->priv;
201 struct mii_bus *bus = ps->bus;
202 struct dsa_loop_vlan *vl;
203 u16 vid;
205 dev_dbg(ds->dev, "%s\n", __func__);
207 /* Just do a sleeping operation to make lockdep checks effective */
208 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
210 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
211 vl = &ps->vlans[vid];
213 vl->members |= BIT(port);
214 if (untagged)
215 vl->untagged |= BIT(port);
216 else
217 vl->untagged &= ~BIT(port);
220 if (pvid)
221 ps->pvid = vid;
224 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
225 const struct switchdev_obj_port_vlan *vlan)
227 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
228 struct dsa_loop_priv *ps = ds->priv;
229 struct mii_bus *bus = ps->bus;
230 struct dsa_loop_vlan *vl;
231 u16 vid, pvid = ps->pvid;
233 dev_dbg(ds->dev, "%s\n", __func__);
235 /* Just do a sleeping operation to make lockdep checks effective */
236 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
238 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
239 vl = &ps->vlans[vid];
241 vl->members &= ~BIT(port);
242 if (untagged)
243 vl->untagged &= ~BIT(port);
245 if (pvid == vid)
246 pvid = 1;
248 ps->pvid = pvid;
250 return 0;
253 static const struct dsa_switch_ops dsa_loop_driver = {
254 .get_tag_protocol = dsa_loop_get_protocol,
255 .setup = dsa_loop_setup,
256 .get_strings = dsa_loop_get_strings,
257 .get_ethtool_stats = dsa_loop_get_ethtool_stats,
258 .get_sset_count = dsa_loop_get_sset_count,
259 .phy_read = dsa_loop_phy_read,
260 .phy_write = dsa_loop_phy_write,
261 .port_bridge_join = dsa_loop_port_bridge_join,
262 .port_bridge_leave = dsa_loop_port_bridge_leave,
263 .port_stp_state_set = dsa_loop_port_stp_state_set,
264 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
265 .port_vlan_prepare = dsa_loop_port_vlan_prepare,
266 .port_vlan_add = dsa_loop_port_vlan_add,
267 .port_vlan_del = dsa_loop_port_vlan_del,
270 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
272 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
273 struct dsa_loop_priv *ps;
274 struct dsa_switch *ds;
276 if (!pdata)
277 return -ENODEV;
279 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
280 pdata->name, pdata->enabled_ports);
282 ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
283 if (!ds)
284 return -ENOMEM;
286 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
287 if (!ps)
288 return -ENOMEM;
290 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
291 if (!ps->netdev)
292 return -EPROBE_DEFER;
294 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
296 ds->dev = &mdiodev->dev;
297 ds->ops = &dsa_loop_driver;
298 ds->priv = ps;
299 ps->bus = mdiodev->bus;
301 dev_set_drvdata(&mdiodev->dev, ds);
303 return dsa_register_switch(ds);
306 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
308 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
309 struct dsa_loop_priv *ps = ds->priv;
311 dsa_unregister_switch(ds);
312 dev_put(ps->netdev);
315 static struct mdio_driver dsa_loop_drv = {
316 .mdiodrv.driver = {
317 .name = "dsa-loop",
319 .probe = dsa_loop_drv_probe,
320 .remove = dsa_loop_drv_remove,
323 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
325 static int __init dsa_loop_init(void)
327 struct fixed_phy_status status = {
328 .link = 1,
329 .speed = SPEED_100,
330 .duplex = DUPLEX_FULL,
332 unsigned int i;
334 for (i = 0; i < NUM_FIXED_PHYS; i++)
335 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
337 return mdio_driver_register(&dsa_loop_drv);
339 module_init(dsa_loop_init);
341 static void __exit dsa_loop_exit(void)
343 unsigned int i;
345 mdio_driver_unregister(&dsa_loop_drv);
346 for (i = 0; i < NUM_FIXED_PHYS; i++)
347 if (!IS_ERR(phydevs[i]))
348 fixed_phy_unregister(phydevs[i]);
350 module_exit(dsa_loop_exit);
352 MODULE_LICENSE("GPL");
353 MODULE_AUTHOR("Florian Fainelli");
354 MODULE_DESCRIPTION("DSA loopback driver");