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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/dsa/dsa.c - Hardware switch handling
4 * Copyright (c) 2008-2009 Marvell Semiconductor
5 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
6 */
7
8#include <linux/device.h>
9#include <linux/list.h>
10#include <linux/platform_device.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/notifier.h>
14#include <linux/of.h>
15#include <linux/of_mdio.h>
16#include <linux/of_platform.h>
17#include <linux/of_net.h>
18#include <linux/netdevice.h>
19#include <linux/sysfs.h>
20#include <linux/phy_fixed.h>
21#include <linux/ptp_classify.h>
22#include <linux/etherdevice.h>
23
24#include "dsa_priv.h"
25
26static LIST_HEAD(dsa_tag_drivers_list);
27static DEFINE_MUTEX(dsa_tag_drivers_lock);
28
29static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
30 struct net_device *dev)
31{
32 /* Just return the original SKB */
33 return skb;
34}
35
36static const struct dsa_device_ops none_ops = {
37 .name = "none",
38 .proto = DSA_TAG_PROTO_NONE,
39 .xmit = dsa_slave_notag_xmit,
40 .rcv = NULL,
41};
42
43DSA_TAG_DRIVER(none_ops);
44
45static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
46 struct module *owner)
47{
48 dsa_tag_driver->owner = owner;
49
50 mutex_lock(&dsa_tag_drivers_lock);
51 list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
52 mutex_unlock(&dsa_tag_drivers_lock);
53}
54
55void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
56 unsigned int count, struct module *owner)
57{
58 unsigned int i;
59
60 for (i = 0; i < count; i++)
61 dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
62}
63
64static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
65{
66 mutex_lock(&dsa_tag_drivers_lock);
67 list_del(&dsa_tag_driver->list);
68 mutex_unlock(&dsa_tag_drivers_lock);
69}
70EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);
71
72void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
73 unsigned int count)
74{
75 unsigned int i;
76
77 for (i = 0; i < count; i++)
78 dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
79}
80EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);
81
82const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
83{
84 return ops->name;
85};
86
87const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
88{
89 struct dsa_tag_driver *dsa_tag_driver;
90 const struct dsa_device_ops *ops;
91 char module_name[128];
92 bool found = false;
93
94 snprintf(module_name, 127, "%s%d", DSA_TAG_DRIVER_ALIAS,
95 tag_protocol);
96
97 request_module(module_name);
98
99 mutex_lock(&dsa_tag_drivers_lock);
100 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
101 ops = dsa_tag_driver->ops;
102 if (ops->proto == tag_protocol) {
103 found = true;
104 break;
105 }
106 }
107
108 if (found) {
109 if (!try_module_get(dsa_tag_driver->owner))
110 ops = ERR_PTR(-ENOPROTOOPT);
111 } else {
112 ops = ERR_PTR(-ENOPROTOOPT);
113 }
114
115 mutex_unlock(&dsa_tag_drivers_lock);
116
117 return ops;
118}
119
120void dsa_tag_driver_put(const struct dsa_device_ops *ops)
121{
122 struct dsa_tag_driver *dsa_tag_driver;
123
124 mutex_lock(&dsa_tag_drivers_lock);
125 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
126 if (dsa_tag_driver->ops == ops) {
127 module_put(dsa_tag_driver->owner);
128 break;
129 }
130 }
131 mutex_unlock(&dsa_tag_drivers_lock);
132}
133
134static int dev_is_class(struct device *dev, void *class)
135{
136 if (dev->class != NULL && !strcmp(dev->class->name, class))
137 return 1;
138
139 return 0;
140}
141
142static struct device *dev_find_class(struct device *parent, char *class)
143{
144 if (dev_is_class(parent, class)) {
145 get_device(parent);
146 return parent;
147 }
148
149 return device_find_child(parent, class, dev_is_class);
150}
151
152struct net_device *dsa_dev_to_net_device(struct device *dev)
153{
154 struct device *d;
155
156 d = dev_find_class(dev, "net");
157 if (d != NULL) {
158 struct net_device *nd;
159
160 nd = to_net_dev(d);
161 dev_hold(nd);
162 put_device(d);
163
164 return nd;
165 }
166
167 return NULL;
168}
169EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
170
171/* Determine if we should defer delivery of skb until we have a rx timestamp.
172 *
173 * Called from dsa_switch_rcv. For now, this will only work if tagging is
174 * enabled on the switch. Normally the MAC driver would retrieve the hardware
175 * timestamp when it reads the packet out of the hardware. However in a DSA
176 * switch, the DSA driver owning the interface to which the packet is
177 * delivered is never notified unless we do so here.
178 */
179static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
180 struct sk_buff *skb)
181{
182 struct dsa_switch *ds = p->dp->ds;
183 unsigned int type;
184
185 if (skb_headroom(skb) < ETH_HLEN)
186 return false;
187
188 __skb_push(skb, ETH_HLEN);
189
190 type = ptp_classify_raw(skb);
191
192 __skb_pull(skb, ETH_HLEN);
193
194 if (type == PTP_CLASS_NONE)
195 return false;
196
197 if (likely(ds->ops->port_rxtstamp))
198 return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
199
200 return false;
201}
202
203static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
204 struct packet_type *pt, struct net_device *unused)
205{
206 struct dsa_port *cpu_dp = dev->dsa_ptr;
207 struct sk_buff *nskb = NULL;
208 struct pcpu_sw_netstats *s;
209 struct dsa_slave_priv *p;
210
211 if (unlikely(!cpu_dp)) {
212 kfree_skb(skb);
213 return 0;
214 }
215
216 skb = skb_unshare(skb, GFP_ATOMIC);
217 if (!skb)
218 return 0;
219
220 nskb = cpu_dp->rcv(skb, dev, pt);
221 if (!nskb) {
222 kfree_skb(skb);
223 return 0;
224 }
225
226 skb = nskb;
227 p = netdev_priv(skb->dev);
228 skb_push(skb, ETH_HLEN);
229 skb->pkt_type = PACKET_HOST;
230 skb->protocol = eth_type_trans(skb, skb->dev);
231
232 s = this_cpu_ptr(p->stats64);
233 u64_stats_update_begin(&s->syncp);
234 s->rx_packets++;
235 s->rx_bytes += skb->len;
236 u64_stats_update_end(&s->syncp);
237
238 if (dsa_skb_defer_rx_timestamp(p, skb))
239 return 0;
240
241 netif_receive_skb(skb);
242
243 return 0;
244}
245
246#ifdef CONFIG_PM_SLEEP
247static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
248{
249 return dsa_is_user_port(ds, p) && ds->ports[p].slave;
250}
251
252int dsa_switch_suspend(struct dsa_switch *ds)
253{
254 int i, ret = 0;
255
256 /* Suspend slave network devices */
257 for (i = 0; i < ds->num_ports; i++) {
258 if (!dsa_is_port_initialized(ds, i))
259 continue;
260
261 ret = dsa_slave_suspend(ds->ports[i].slave);
262 if (ret)
263 return ret;
264 }
265
266 if (ds->ops->suspend)
267 ret = ds->ops->suspend(ds);
268
269 return ret;
270}
271EXPORT_SYMBOL_GPL(dsa_switch_suspend);
272
273int dsa_switch_resume(struct dsa_switch *ds)
274{
275 int i, ret = 0;
276
277 if (ds->ops->resume)
278 ret = ds->ops->resume(ds);
279
280 if (ret)
281 return ret;
282
283 /* Resume slave network devices */
284 for (i = 0; i < ds->num_ports; i++) {
285 if (!dsa_is_port_initialized(ds, i))
286 continue;
287
288 ret = dsa_slave_resume(ds->ports[i].slave);
289 if (ret)
290 return ret;
291 }
292
293 return 0;
294}
295EXPORT_SYMBOL_GPL(dsa_switch_resume);
296#endif
297
298static struct packet_type dsa_pack_type __read_mostly = {
299 .type = cpu_to_be16(ETH_P_XDSA),
300 .func = dsa_switch_rcv,
301};
302
303static struct workqueue_struct *dsa_owq;
304
305bool dsa_schedule_work(struct work_struct *work)
306{
307 return queue_work(dsa_owq, work);
308}
309
310static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);
311
312int register_dsa_notifier(struct notifier_block *nb)
313{
314 return atomic_notifier_chain_register(&dsa_notif_chain, nb);
315}
316EXPORT_SYMBOL_GPL(register_dsa_notifier);
317
318int unregister_dsa_notifier(struct notifier_block *nb)
319{
320 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
321}
322EXPORT_SYMBOL_GPL(unregister_dsa_notifier);
323
324int call_dsa_notifiers(unsigned long val, struct net_device *dev,
325 struct dsa_notifier_info *info)
326{
327 info->dev = dev;
328 return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
329}
330EXPORT_SYMBOL_GPL(call_dsa_notifiers);
331
332static int __init dsa_init_module(void)
333{
334 int rc;
335
336 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
337 WQ_MEM_RECLAIM);
338 if (!dsa_owq)
339 return -ENOMEM;
340
341 rc = dsa_slave_register_notifier();
342 if (rc)
343 goto register_notifier_fail;
344
345 dev_add_pack(&dsa_pack_type);
346
347 dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
348 THIS_MODULE);
349
350 return 0;
351
352register_notifier_fail:
353 destroy_workqueue(dsa_owq);
354
355 return rc;
356}
357module_init(dsa_init_module);
358
359static void __exit dsa_cleanup_module(void)
360{
361 dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));
362
363 dsa_slave_unregister_notifier();
364 dev_remove_pack(&dsa_pack_type);
365 destroy_workqueue(dsa_owq);
366}
367module_exit(dsa_cleanup_module);
368
369MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
370MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
371MODULE_LICENSE("GPL");
372MODULE_ALIAS("platform:dsa");
1/*
2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
5 *
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.
10 */
11
12#include <linux/ctype.h>
13#include <linux/device.h>
14#include <linux/hwmon.h>
15#include <linux/list.h>
16#include <linux/platform_device.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <net/dsa.h>
20#include <linux/of.h>
21#include <linux/of_mdio.h>
22#include <linux/of_platform.h>
23#include <linux/of_net.h>
24#include <linux/of_gpio.h>
25#include <linux/sysfs.h>
26#include <linux/phy_fixed.h>
27#include <linux/gpio/consumer.h>
28#include "dsa_priv.h"
29
30char dsa_driver_version[] = "0.1";
31
32static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
33 struct net_device *dev)
34{
35 /* Just return the original SKB */
36 return skb;
37}
38
39static const struct dsa_device_ops none_ops = {
40 .xmit = dsa_slave_notag_xmit,
41 .rcv = NULL,
42};
43
44const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
45#ifdef CONFIG_NET_DSA_TAG_DSA
46 [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
47#endif
48#ifdef CONFIG_NET_DSA_TAG_EDSA
49 [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
50#endif
51#ifdef CONFIG_NET_DSA_TAG_TRAILER
52 [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
53#endif
54#ifdef CONFIG_NET_DSA_TAG_BRCM
55 [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
56#endif
57#ifdef CONFIG_NET_DSA_TAG_QCA
58 [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
59#endif
60 [DSA_TAG_PROTO_NONE] = &none_ops,
61};
62
63/* switch driver registration ***********************************************/
64static DEFINE_MUTEX(dsa_switch_drivers_mutex);
65static LIST_HEAD(dsa_switch_drivers);
66
67void register_switch_driver(struct dsa_switch_ops *ops)
68{
69 mutex_lock(&dsa_switch_drivers_mutex);
70 list_add_tail(&ops->list, &dsa_switch_drivers);
71 mutex_unlock(&dsa_switch_drivers_mutex);
72}
73EXPORT_SYMBOL_GPL(register_switch_driver);
74
75void unregister_switch_driver(struct dsa_switch_ops *ops)
76{
77 mutex_lock(&dsa_switch_drivers_mutex);
78 list_del_init(&ops->list);
79 mutex_unlock(&dsa_switch_drivers_mutex);
80}
81EXPORT_SYMBOL_GPL(unregister_switch_driver);
82
83static struct dsa_switch_ops *
84dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
85 const char **_name, void **priv)
86{
87 struct dsa_switch_ops *ret;
88 struct list_head *list;
89 const char *name;
90
91 ret = NULL;
92 name = NULL;
93
94 mutex_lock(&dsa_switch_drivers_mutex);
95 list_for_each(list, &dsa_switch_drivers) {
96 struct dsa_switch_ops *ops;
97
98 ops = list_entry(list, struct dsa_switch_ops, list);
99
100 name = ops->probe(parent, host_dev, sw_addr, priv);
101 if (name != NULL) {
102 ret = ops;
103 break;
104 }
105 }
106 mutex_unlock(&dsa_switch_drivers_mutex);
107
108 *_name = name;
109
110 return ret;
111}
112
113/* hwmon support ************************************************************/
114
115#ifdef CONFIG_NET_DSA_HWMON
116
117static ssize_t temp1_input_show(struct device *dev,
118 struct device_attribute *attr, char *buf)
119{
120 struct dsa_switch *ds = dev_get_drvdata(dev);
121 int temp, ret;
122
123 ret = ds->ops->get_temp(ds, &temp);
124 if (ret < 0)
125 return ret;
126
127 return sprintf(buf, "%d\n", temp * 1000);
128}
129static DEVICE_ATTR_RO(temp1_input);
130
131static ssize_t temp1_max_show(struct device *dev,
132 struct device_attribute *attr, char *buf)
133{
134 struct dsa_switch *ds = dev_get_drvdata(dev);
135 int temp, ret;
136
137 ret = ds->ops->get_temp_limit(ds, &temp);
138 if (ret < 0)
139 return ret;
140
141 return sprintf(buf, "%d\n", temp * 1000);
142}
143
144static ssize_t temp1_max_store(struct device *dev,
145 struct device_attribute *attr, const char *buf,
146 size_t count)
147{
148 struct dsa_switch *ds = dev_get_drvdata(dev);
149 int temp, ret;
150
151 ret = kstrtoint(buf, 0, &temp);
152 if (ret < 0)
153 return ret;
154
155 ret = ds->ops->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
156 if (ret < 0)
157 return ret;
158
159 return count;
160}
161static DEVICE_ATTR_RW(temp1_max);
162
163static ssize_t temp1_max_alarm_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165{
166 struct dsa_switch *ds = dev_get_drvdata(dev);
167 bool alarm;
168 int ret;
169
170 ret = ds->ops->get_temp_alarm(ds, &alarm);
171 if (ret < 0)
172 return ret;
173
174 return sprintf(buf, "%d\n", alarm);
175}
176static DEVICE_ATTR_RO(temp1_max_alarm);
177
178static struct attribute *dsa_hwmon_attrs[] = {
179 &dev_attr_temp1_input.attr, /* 0 */
180 &dev_attr_temp1_max.attr, /* 1 */
181 &dev_attr_temp1_max_alarm.attr, /* 2 */
182 NULL
183};
184
185static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
186 struct attribute *attr, int index)
187{
188 struct device *dev = container_of(kobj, struct device, kobj);
189 struct dsa_switch *ds = dev_get_drvdata(dev);
190 struct dsa_switch_ops *ops = ds->ops;
191 umode_t mode = attr->mode;
192
193 if (index == 1) {
194 if (!ops->get_temp_limit)
195 mode = 0;
196 else if (!ops->set_temp_limit)
197 mode &= ~S_IWUSR;
198 } else if (index == 2 && !ops->get_temp_alarm) {
199 mode = 0;
200 }
201 return mode;
202}
203
204static const struct attribute_group dsa_hwmon_group = {
205 .attrs = dsa_hwmon_attrs,
206 .is_visible = dsa_hwmon_attrs_visible,
207};
208__ATTRIBUTE_GROUPS(dsa_hwmon);
209
210#endif /* CONFIG_NET_DSA_HWMON */
211
212/* basic switch operations **************************************************/
213int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
214 struct device_node *port_dn, int port)
215{
216 struct phy_device *phydev;
217 int ret, mode;
218
219 if (of_phy_is_fixed_link(port_dn)) {
220 ret = of_phy_register_fixed_link(port_dn);
221 if (ret) {
222 dev_err(dev, "failed to register fixed PHY\n");
223 return ret;
224 }
225 phydev = of_phy_find_device(port_dn);
226
227 mode = of_get_phy_mode(port_dn);
228 if (mode < 0)
229 mode = PHY_INTERFACE_MODE_NA;
230 phydev->interface = mode;
231
232 genphy_config_init(phydev);
233 genphy_read_status(phydev);
234 if (ds->ops->adjust_link)
235 ds->ops->adjust_link(ds, port, phydev);
236
237 put_device(&phydev->mdio.dev);
238 }
239
240 return 0;
241}
242
243static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
244{
245 struct device_node *port_dn;
246 int ret, port;
247
248 for (port = 0; port < DSA_MAX_PORTS; port++) {
249 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
250 continue;
251
252 port_dn = ds->ports[port].dn;
253 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
254 if (ret)
255 return ret;
256 }
257 return 0;
258}
259
260const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
261{
262 const struct dsa_device_ops *ops;
263
264 if (tag_protocol >= DSA_TAG_LAST)
265 return ERR_PTR(-EINVAL);
266 ops = dsa_device_ops[tag_protocol];
267
268 if (!ops)
269 return ERR_PTR(-ENOPROTOOPT);
270
271 return ops;
272}
273
274int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
275{
276 struct net_device *master;
277 struct ethtool_ops *cpu_ops;
278
279 master = ds->dst->master_netdev;
280 if (ds->master_netdev)
281 master = ds->master_netdev;
282
283 cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
284 if (!cpu_ops)
285 return -ENOMEM;
286
287 memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
288 sizeof(struct ethtool_ops));
289 ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
290 memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
291 sizeof(struct ethtool_ops));
292 dsa_cpu_port_ethtool_init(cpu_ops);
293 master->ethtool_ops = cpu_ops;
294
295 return 0;
296}
297
298void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
299{
300 struct net_device *master;
301
302 master = ds->dst->master_netdev;
303 if (ds->master_netdev)
304 master = ds->master_netdev;
305
306 master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
307}
308
309static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
310{
311 struct dsa_switch_ops *ops = ds->ops;
312 struct dsa_switch_tree *dst = ds->dst;
313 struct dsa_chip_data *cd = ds->cd;
314 bool valid_name_found = false;
315 int index = ds->index;
316 int i, ret;
317
318 /*
319 * Validate supplied switch configuration.
320 */
321 for (i = 0; i < DSA_MAX_PORTS; i++) {
322 char *name;
323
324 name = cd->port_names[i];
325 if (name == NULL)
326 continue;
327
328 if (!strcmp(name, "cpu")) {
329 if (dst->cpu_switch != -1) {
330 netdev_err(dst->master_netdev,
331 "multiple cpu ports?!\n");
332 ret = -EINVAL;
333 goto out;
334 }
335 dst->cpu_switch = index;
336 dst->cpu_port = i;
337 ds->cpu_port_mask |= 1 << i;
338 } else if (!strcmp(name, "dsa")) {
339 ds->dsa_port_mask |= 1 << i;
340 } else {
341 ds->enabled_port_mask |= 1 << i;
342 }
343 valid_name_found = true;
344 }
345
346 if (!valid_name_found && i == DSA_MAX_PORTS) {
347 ret = -EINVAL;
348 goto out;
349 }
350
351 /* Make the built-in MII bus mask match the number of ports,
352 * switch drivers can override this later
353 */
354 ds->phys_mii_mask = ds->enabled_port_mask;
355
356 /*
357 * If the CPU connects to this switch, set the switch tree
358 * tagging protocol to the preferred tagging format of this
359 * switch.
360 */
361 if (dst->cpu_switch == index) {
362 enum dsa_tag_protocol tag_protocol;
363
364 tag_protocol = ops->get_tag_protocol(ds);
365 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
366 if (IS_ERR(dst->tag_ops)) {
367 ret = PTR_ERR(dst->tag_ops);
368 goto out;
369 }
370
371 dst->rcv = dst->tag_ops->rcv;
372 }
373
374 memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
375
376 /*
377 * Do basic register setup.
378 */
379 ret = ops->setup(ds);
380 if (ret < 0)
381 goto out;
382
383 if (ops->set_addr) {
384 ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
385 if (ret < 0)
386 goto out;
387 }
388
389 if (!ds->slave_mii_bus && ops->phy_read) {
390 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
391 if (!ds->slave_mii_bus) {
392 ret = -ENOMEM;
393 goto out;
394 }
395 dsa_slave_mii_bus_init(ds);
396
397 ret = mdiobus_register(ds->slave_mii_bus);
398 if (ret < 0)
399 goto out;
400 }
401
402 /*
403 * Create network devices for physical switch ports.
404 */
405 for (i = 0; i < DSA_MAX_PORTS; i++) {
406 ds->ports[i].dn = cd->port_dn[i];
407
408 if (!(ds->enabled_port_mask & (1 << i)))
409 continue;
410
411 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
412 if (ret < 0) {
413 netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
414 index, i, cd->port_names[i], ret);
415 ret = 0;
416 }
417 }
418
419 /* Perform configuration of the CPU and DSA ports */
420 ret = dsa_cpu_dsa_setups(ds, parent);
421 if (ret < 0) {
422 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
423 index);
424 ret = 0;
425 }
426
427 ret = dsa_cpu_port_ethtool_setup(ds);
428 if (ret)
429 return ret;
430
431#ifdef CONFIG_NET_DSA_HWMON
432 /* If the switch provides a temperature sensor,
433 * register with hardware monitoring subsystem.
434 * Treat registration error as non-fatal and ignore it.
435 */
436 if (ops->get_temp) {
437 const char *netname = netdev_name(dst->master_netdev);
438 char hname[IFNAMSIZ + 1];
439 int i, j;
440
441 /* Create valid hwmon 'name' attribute */
442 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
443 if (isalnum(netname[i]))
444 hname[j++] = netname[i];
445 }
446 hname[j] = '\0';
447 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
448 hname, index);
449 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
450 ds->hwmon_name, ds, dsa_hwmon_groups);
451 if (IS_ERR(ds->hwmon_dev))
452 ds->hwmon_dev = NULL;
453 }
454#endif /* CONFIG_NET_DSA_HWMON */
455
456 return ret;
457
458out:
459 return ret;
460}
461
462static struct dsa_switch *
463dsa_switch_setup(struct dsa_switch_tree *dst, int index,
464 struct device *parent, struct device *host_dev)
465{
466 struct dsa_chip_data *cd = dst->pd->chip + index;
467 struct dsa_switch_ops *ops;
468 struct dsa_switch *ds;
469 int ret;
470 const char *name;
471 void *priv;
472
473 /*
474 * Probe for switch model.
475 */
476 ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
477 if (!ops) {
478 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
479 index);
480 return ERR_PTR(-EINVAL);
481 }
482 netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
483 index, name);
484
485
486 /*
487 * Allocate and initialise switch state.
488 */
489 ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
490 if (ds == NULL)
491 return ERR_PTR(-ENOMEM);
492
493 ds->dst = dst;
494 ds->index = index;
495 ds->cd = cd;
496 ds->ops = ops;
497 ds->priv = priv;
498 ds->dev = parent;
499
500 ret = dsa_switch_setup_one(ds, parent);
501 if (ret)
502 return ERR_PTR(ret);
503
504 return ds;
505}
506
507void dsa_cpu_dsa_destroy(struct device_node *port_dn)
508{
509 if (of_phy_is_fixed_link(port_dn))
510 of_phy_deregister_fixed_link(port_dn);
511}
512
513static void dsa_switch_destroy(struct dsa_switch *ds)
514{
515 int port;
516
517#ifdef CONFIG_NET_DSA_HWMON
518 if (ds->hwmon_dev)
519 hwmon_device_unregister(ds->hwmon_dev);
520#endif
521
522 /* Destroy network devices for physical switch ports. */
523 for (port = 0; port < DSA_MAX_PORTS; port++) {
524 if (!(ds->enabled_port_mask & (1 << port)))
525 continue;
526
527 if (!ds->ports[port].netdev)
528 continue;
529
530 dsa_slave_destroy(ds->ports[port].netdev);
531 }
532
533 /* Disable configuration of the CPU and DSA ports */
534 for (port = 0; port < DSA_MAX_PORTS; port++) {
535 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
536 continue;
537 dsa_cpu_dsa_destroy(ds->ports[port].dn);
538
539 /* Clearing a bit which is not set does no harm */
540 ds->cpu_port_mask |= ~(1 << port);
541 ds->dsa_port_mask |= ~(1 << port);
542 }
543
544 if (ds->slave_mii_bus && ds->ops->phy_read)
545 mdiobus_unregister(ds->slave_mii_bus);
546}
547
548#ifdef CONFIG_PM_SLEEP
549int dsa_switch_suspend(struct dsa_switch *ds)
550{
551 int i, ret = 0;
552
553 /* Suspend slave network devices */
554 for (i = 0; i < DSA_MAX_PORTS; i++) {
555 if (!dsa_is_port_initialized(ds, i))
556 continue;
557
558 ret = dsa_slave_suspend(ds->ports[i].netdev);
559 if (ret)
560 return ret;
561 }
562
563 if (ds->ops->suspend)
564 ret = ds->ops->suspend(ds);
565
566 return ret;
567}
568EXPORT_SYMBOL_GPL(dsa_switch_suspend);
569
570int dsa_switch_resume(struct dsa_switch *ds)
571{
572 int i, ret = 0;
573
574 if (ds->ops->resume)
575 ret = ds->ops->resume(ds);
576
577 if (ret)
578 return ret;
579
580 /* Resume slave network devices */
581 for (i = 0; i < DSA_MAX_PORTS; i++) {
582 if (!dsa_is_port_initialized(ds, i))
583 continue;
584
585 ret = dsa_slave_resume(ds->ports[i].netdev);
586 if (ret)
587 return ret;
588 }
589
590 return 0;
591}
592EXPORT_SYMBOL_GPL(dsa_switch_resume);
593#endif
594
595/* platform driver init and cleanup *****************************************/
596static int dev_is_class(struct device *dev, void *class)
597{
598 if (dev->class != NULL && !strcmp(dev->class->name, class))
599 return 1;
600
601 return 0;
602}
603
604static struct device *dev_find_class(struct device *parent, char *class)
605{
606 if (dev_is_class(parent, class)) {
607 get_device(parent);
608 return parent;
609 }
610
611 return device_find_child(parent, class, dev_is_class);
612}
613
614struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
615{
616 struct device *d;
617
618 d = dev_find_class(dev, "mdio_bus");
619 if (d != NULL) {
620 struct mii_bus *bus;
621
622 bus = to_mii_bus(d);
623 put_device(d);
624
625 return bus;
626 }
627
628 return NULL;
629}
630EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
631
632static struct net_device *dev_to_net_device(struct device *dev)
633{
634 struct device *d;
635
636 d = dev_find_class(dev, "net");
637 if (d != NULL) {
638 struct net_device *nd;
639
640 nd = to_net_dev(d);
641 dev_hold(nd);
642 put_device(d);
643
644 return nd;
645 }
646
647 return NULL;
648}
649
650#ifdef CONFIG_OF
651static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
652 struct dsa_chip_data *cd,
653 int chip_index, int port_index,
654 struct device_node *link)
655{
656 const __be32 *reg;
657 int link_sw_addr;
658 struct device_node *parent_sw;
659 int len;
660
661 parent_sw = of_get_parent(link);
662 if (!parent_sw)
663 return -EINVAL;
664
665 reg = of_get_property(parent_sw, "reg", &len);
666 if (!reg || (len != sizeof(*reg) * 2))
667 return -EINVAL;
668
669 /*
670 * Get the destination switch number from the second field of its 'reg'
671 * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
672 */
673 link_sw_addr = be32_to_cpup(reg + 1);
674
675 if (link_sw_addr >= pd->nr_chips)
676 return -EINVAL;
677
678 cd->rtable[link_sw_addr] = port_index;
679
680 return 0;
681}
682
683static int dsa_of_probe_links(struct dsa_platform_data *pd,
684 struct dsa_chip_data *cd,
685 int chip_index, int port_index,
686 struct device_node *port,
687 const char *port_name)
688{
689 struct device_node *link;
690 int link_index;
691 int ret;
692
693 for (link_index = 0;; link_index++) {
694 link = of_parse_phandle(port, "link", link_index);
695 if (!link)
696 break;
697
698 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
699 ret = dsa_of_setup_routing_table(pd, cd, chip_index,
700 port_index, link);
701 if (ret)
702 return ret;
703 }
704 }
705 return 0;
706}
707
708static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
709{
710 int i;
711 int port_index;
712
713 for (i = 0; i < pd->nr_chips; i++) {
714 port_index = 0;
715 while (port_index < DSA_MAX_PORTS) {
716 kfree(pd->chip[i].port_names[port_index]);
717 port_index++;
718 }
719
720 /* Drop our reference to the MDIO bus device */
721 if (pd->chip[i].host_dev)
722 put_device(pd->chip[i].host_dev);
723 }
724 kfree(pd->chip);
725}
726
727static int dsa_of_probe(struct device *dev)
728{
729 struct device_node *np = dev->of_node;
730 struct device_node *child, *mdio, *ethernet, *port;
731 struct mii_bus *mdio_bus, *mdio_bus_switch;
732 struct net_device *ethernet_dev;
733 struct dsa_platform_data *pd;
734 struct dsa_chip_data *cd;
735 const char *port_name;
736 int chip_index, port_index;
737 const unsigned int *sw_addr, *port_reg;
738 u32 eeprom_len;
739 int ret;
740
741 mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
742 if (!mdio)
743 return -EINVAL;
744
745 mdio_bus = of_mdio_find_bus(mdio);
746 if (!mdio_bus)
747 return -EPROBE_DEFER;
748
749 ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
750 if (!ethernet) {
751 ret = -EINVAL;
752 goto out_put_mdio;
753 }
754
755 ethernet_dev = of_find_net_device_by_node(ethernet);
756 if (!ethernet_dev) {
757 ret = -EPROBE_DEFER;
758 goto out_put_mdio;
759 }
760
761 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
762 if (!pd) {
763 ret = -ENOMEM;
764 goto out_put_ethernet;
765 }
766
767 dev->platform_data = pd;
768 pd->of_netdev = ethernet_dev;
769 pd->nr_chips = of_get_available_child_count(np);
770 if (pd->nr_chips > DSA_MAX_SWITCHES)
771 pd->nr_chips = DSA_MAX_SWITCHES;
772
773 pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
774 GFP_KERNEL);
775 if (!pd->chip) {
776 ret = -ENOMEM;
777 goto out_free;
778 }
779
780 chip_index = -1;
781 for_each_available_child_of_node(np, child) {
782 int i;
783
784 chip_index++;
785 cd = &pd->chip[chip_index];
786
787 cd->of_node = child;
788
789 /* Initialize the routing table */
790 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
791 cd->rtable[i] = DSA_RTABLE_NONE;
792
793 /* When assigning the host device, increment its refcount */
794 cd->host_dev = get_device(&mdio_bus->dev);
795
796 sw_addr = of_get_property(child, "reg", NULL);
797 if (!sw_addr)
798 continue;
799
800 cd->sw_addr = be32_to_cpup(sw_addr);
801 if (cd->sw_addr >= PHY_MAX_ADDR)
802 continue;
803
804 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
805 cd->eeprom_len = eeprom_len;
806
807 mdio = of_parse_phandle(child, "mii-bus", 0);
808 if (mdio) {
809 mdio_bus_switch = of_mdio_find_bus(mdio);
810 if (!mdio_bus_switch) {
811 ret = -EPROBE_DEFER;
812 goto out_free_chip;
813 }
814
815 /* Drop the mdio_bus device ref, replacing the host
816 * device with the mdio_bus_switch device, keeping
817 * the refcount from of_mdio_find_bus() above.
818 */
819 put_device(cd->host_dev);
820 cd->host_dev = &mdio_bus_switch->dev;
821 }
822
823 for_each_available_child_of_node(child, port) {
824 port_reg = of_get_property(port, "reg", NULL);
825 if (!port_reg)
826 continue;
827
828 port_index = be32_to_cpup(port_reg);
829 if (port_index >= DSA_MAX_PORTS)
830 break;
831
832 port_name = of_get_property(port, "label", NULL);
833 if (!port_name)
834 continue;
835
836 cd->port_dn[port_index] = port;
837
838 cd->port_names[port_index] = kstrdup(port_name,
839 GFP_KERNEL);
840 if (!cd->port_names[port_index]) {
841 ret = -ENOMEM;
842 goto out_free_chip;
843 }
844
845 ret = dsa_of_probe_links(pd, cd, chip_index,
846 port_index, port, port_name);
847 if (ret)
848 goto out_free_chip;
849
850 }
851 }
852
853 /* The individual chips hold their own refcount on the mdio bus,
854 * so drop ours */
855 put_device(&mdio_bus->dev);
856
857 return 0;
858
859out_free_chip:
860 dsa_of_free_platform_data(pd);
861out_free:
862 kfree(pd);
863 dev->platform_data = NULL;
864out_put_ethernet:
865 put_device(ðernet_dev->dev);
866out_put_mdio:
867 put_device(&mdio_bus->dev);
868 return ret;
869}
870
871static void dsa_of_remove(struct device *dev)
872{
873 struct dsa_platform_data *pd = dev->platform_data;
874
875 if (!dev->of_node)
876 return;
877
878 dsa_of_free_platform_data(pd);
879 put_device(&pd->of_netdev->dev);
880 kfree(pd);
881}
882#else
883static inline int dsa_of_probe(struct device *dev)
884{
885 return 0;
886}
887
888static inline void dsa_of_remove(struct device *dev)
889{
890}
891#endif
892
893static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
894 struct device *parent, struct dsa_platform_data *pd)
895{
896 int i;
897 unsigned configured = 0;
898
899 dst->pd = pd;
900 dst->master_netdev = dev;
901 dst->cpu_switch = -1;
902 dst->cpu_port = -1;
903
904 for (i = 0; i < pd->nr_chips; i++) {
905 struct dsa_switch *ds;
906
907 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
908 if (IS_ERR(ds)) {
909 netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
910 i, PTR_ERR(ds));
911 continue;
912 }
913
914 dst->ds[i] = ds;
915
916 ++configured;
917 }
918
919 /*
920 * If no switch was found, exit cleanly
921 */
922 if (!configured)
923 return -EPROBE_DEFER;
924
925 /*
926 * If we use a tagging format that doesn't have an ethertype
927 * field, make sure that all packets from this point on get
928 * sent to the tag format's receive function.
929 */
930 wmb();
931 dev->dsa_ptr = (void *)dst;
932
933 return 0;
934}
935
936static int dsa_probe(struct platform_device *pdev)
937{
938 struct dsa_platform_data *pd = pdev->dev.platform_data;
939 struct net_device *dev;
940 struct dsa_switch_tree *dst;
941 int ret;
942
943 pr_notice_once("Distributed Switch Architecture driver version %s\n",
944 dsa_driver_version);
945
946 if (pdev->dev.of_node) {
947 ret = dsa_of_probe(&pdev->dev);
948 if (ret)
949 return ret;
950
951 pd = pdev->dev.platform_data;
952 }
953
954 if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
955 return -EINVAL;
956
957 if (pd->of_netdev) {
958 dev = pd->of_netdev;
959 dev_hold(dev);
960 } else {
961 dev = dev_to_net_device(pd->netdev);
962 }
963 if (dev == NULL) {
964 ret = -EPROBE_DEFER;
965 goto out;
966 }
967
968 if (dev->dsa_ptr != NULL) {
969 dev_put(dev);
970 ret = -EEXIST;
971 goto out;
972 }
973
974 dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
975 if (dst == NULL) {
976 dev_put(dev);
977 ret = -ENOMEM;
978 goto out;
979 }
980
981 platform_set_drvdata(pdev, dst);
982
983 ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
984 if (ret) {
985 dev_put(dev);
986 goto out;
987 }
988
989 return 0;
990
991out:
992 dsa_of_remove(&pdev->dev);
993
994 return ret;
995}
996
997static void dsa_remove_dst(struct dsa_switch_tree *dst)
998{
999 int i;
1000
1001 dst->master_netdev->dsa_ptr = NULL;
1002
1003 /* If we used a tagging format that doesn't have an ethertype
1004 * field, make sure that all packets from this point get sent
1005 * without the tag and go through the regular receive path.
1006 */
1007 wmb();
1008
1009 for (i = 0; i < dst->pd->nr_chips; i++) {
1010 struct dsa_switch *ds = dst->ds[i];
1011
1012 if (ds)
1013 dsa_switch_destroy(ds);
1014 }
1015
1016 dsa_cpu_port_ethtool_restore(dst->ds[0]);
1017
1018 dev_put(dst->master_netdev);
1019}
1020
1021static int dsa_remove(struct platform_device *pdev)
1022{
1023 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1024
1025 dsa_remove_dst(dst);
1026 dsa_of_remove(&pdev->dev);
1027
1028 return 0;
1029}
1030
1031static void dsa_shutdown(struct platform_device *pdev)
1032{
1033}
1034
1035static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
1036 struct packet_type *pt, struct net_device *orig_dev)
1037{
1038 struct dsa_switch_tree *dst = dev->dsa_ptr;
1039
1040 if (unlikely(dst == NULL)) {
1041 kfree_skb(skb);
1042 return 0;
1043 }
1044
1045 return dst->rcv(skb, dev, pt, orig_dev);
1046}
1047
1048static struct packet_type dsa_pack_type __read_mostly = {
1049 .type = cpu_to_be16(ETH_P_XDSA),
1050 .func = dsa_switch_rcv,
1051};
1052
1053static struct notifier_block dsa_netdevice_nb __read_mostly = {
1054 .notifier_call = dsa_slave_netdevice_event,
1055};
1056
1057#ifdef CONFIG_PM_SLEEP
1058static int dsa_suspend(struct device *d)
1059{
1060 struct platform_device *pdev = to_platform_device(d);
1061 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1062 int i, ret = 0;
1063
1064 for (i = 0; i < dst->pd->nr_chips; i++) {
1065 struct dsa_switch *ds = dst->ds[i];
1066
1067 if (ds != NULL)
1068 ret = dsa_switch_suspend(ds);
1069 }
1070
1071 return ret;
1072}
1073
1074static int dsa_resume(struct device *d)
1075{
1076 struct platform_device *pdev = to_platform_device(d);
1077 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1078 int i, ret = 0;
1079
1080 for (i = 0; i < dst->pd->nr_chips; i++) {
1081 struct dsa_switch *ds = dst->ds[i];
1082
1083 if (ds != NULL)
1084 ret = dsa_switch_resume(ds);
1085 }
1086
1087 return ret;
1088}
1089#endif
1090
1091static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1092
1093static const struct of_device_id dsa_of_match_table[] = {
1094 { .compatible = "marvell,dsa", },
1095 {}
1096};
1097MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1098
1099static struct platform_driver dsa_driver = {
1100 .probe = dsa_probe,
1101 .remove = dsa_remove,
1102 .shutdown = dsa_shutdown,
1103 .driver = {
1104 .name = "dsa",
1105 .of_match_table = dsa_of_match_table,
1106 .pm = &dsa_pm_ops,
1107 },
1108};
1109
1110static int __init dsa_init_module(void)
1111{
1112 int rc;
1113
1114 register_netdevice_notifier(&dsa_netdevice_nb);
1115
1116 rc = platform_driver_register(&dsa_driver);
1117 if (rc)
1118 return rc;
1119
1120 dev_add_pack(&dsa_pack_type);
1121
1122 return 0;
1123}
1124module_init(dsa_init_module);
1125
1126static void __exit dsa_cleanup_module(void)
1127{
1128 unregister_netdevice_notifier(&dsa_netdevice_nb);
1129 dev_remove_pack(&dsa_pack_type);
1130 platform_driver_unregister(&dsa_driver);
1131}
1132module_exit(dsa_cleanup_module);
1133
1134MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1135MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1136MODULE_LICENSE("GPL");
1137MODULE_ALIAS("platform:dsa");