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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/list.h>
13#include <linux/netdevice.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <net/dsa.h>
18#include <linux/of.h>
19#include <linux/of_mdio.h>
20#include <linux/of_platform.h>
21#include "dsa_priv.h"
22
23char dsa_driver_version[] = "0.1";
24
25
26/* switch driver registration ***********************************************/
27static DEFINE_MUTEX(dsa_switch_drivers_mutex);
28static LIST_HEAD(dsa_switch_drivers);
29
30void register_switch_driver(struct dsa_switch_driver *drv)
31{
32 mutex_lock(&dsa_switch_drivers_mutex);
33 list_add_tail(&drv->list, &dsa_switch_drivers);
34 mutex_unlock(&dsa_switch_drivers_mutex);
35}
36EXPORT_SYMBOL_GPL(register_switch_driver);
37
38void unregister_switch_driver(struct dsa_switch_driver *drv)
39{
40 mutex_lock(&dsa_switch_drivers_mutex);
41 list_del_init(&drv->list);
42 mutex_unlock(&dsa_switch_drivers_mutex);
43}
44EXPORT_SYMBOL_GPL(unregister_switch_driver);
45
46static struct dsa_switch_driver *
47dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
48{
49 struct dsa_switch_driver *ret;
50 struct list_head *list;
51 char *name;
52
53 ret = NULL;
54 name = NULL;
55
56 mutex_lock(&dsa_switch_drivers_mutex);
57 list_for_each(list, &dsa_switch_drivers) {
58 struct dsa_switch_driver *drv;
59
60 drv = list_entry(list, struct dsa_switch_driver, list);
61
62 name = drv->probe(bus, sw_addr);
63 if (name != NULL) {
64 ret = drv;
65 break;
66 }
67 }
68 mutex_unlock(&dsa_switch_drivers_mutex);
69
70 *_name = name;
71
72 return ret;
73}
74
75
76/* basic switch operations **************************************************/
77static struct dsa_switch *
78dsa_switch_setup(struct dsa_switch_tree *dst, int index,
79 struct device *parent, struct mii_bus *bus)
80{
81 struct dsa_chip_data *pd = dst->pd->chip + index;
82 struct dsa_switch_driver *drv;
83 struct dsa_switch *ds;
84 int ret;
85 char *name;
86 int i;
87 bool valid_name_found = false;
88
89 /*
90 * Probe for switch model.
91 */
92 drv = dsa_switch_probe(bus, pd->sw_addr, &name);
93 if (drv == NULL) {
94 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
95 dst->master_netdev->name, index);
96 return ERR_PTR(-EINVAL);
97 }
98 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
99 dst->master_netdev->name, index, name);
100
101
102 /*
103 * Allocate and initialise switch state.
104 */
105 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
106 if (ds == NULL)
107 return ERR_PTR(-ENOMEM);
108
109 ds->dst = dst;
110 ds->index = index;
111 ds->pd = dst->pd->chip + index;
112 ds->drv = drv;
113 ds->master_mii_bus = bus;
114
115
116 /*
117 * Validate supplied switch configuration.
118 */
119 for (i = 0; i < DSA_MAX_PORTS; i++) {
120 char *name;
121
122 name = pd->port_names[i];
123 if (name == NULL)
124 continue;
125
126 if (!strcmp(name, "cpu")) {
127 if (dst->cpu_switch != -1) {
128 printk(KERN_ERR "multiple cpu ports?!\n");
129 ret = -EINVAL;
130 goto out;
131 }
132 dst->cpu_switch = index;
133 dst->cpu_port = i;
134 } else if (!strcmp(name, "dsa")) {
135 ds->dsa_port_mask |= 1 << i;
136 } else {
137 ds->phys_port_mask |= 1 << i;
138 }
139 valid_name_found = true;
140 }
141
142 if (!valid_name_found && i == DSA_MAX_PORTS) {
143 ret = -EINVAL;
144 goto out;
145 }
146
147 /*
148 * If the CPU connects to this switch, set the switch tree
149 * tagging protocol to the preferred tagging format of this
150 * switch.
151 */
152 if (ds->dst->cpu_switch == index)
153 ds->dst->tag_protocol = drv->tag_protocol;
154
155
156 /*
157 * Do basic register setup.
158 */
159 ret = drv->setup(ds);
160 if (ret < 0)
161 goto out;
162
163 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
164 if (ret < 0)
165 goto out;
166
167 ds->slave_mii_bus = mdiobus_alloc();
168 if (ds->slave_mii_bus == NULL) {
169 ret = -ENOMEM;
170 goto out;
171 }
172 dsa_slave_mii_bus_init(ds);
173
174 ret = mdiobus_register(ds->slave_mii_bus);
175 if (ret < 0)
176 goto out_free;
177
178
179 /*
180 * Create network devices for physical switch ports.
181 */
182 for (i = 0; i < DSA_MAX_PORTS; i++) {
183 struct net_device *slave_dev;
184
185 if (!(ds->phys_port_mask & (1 << i)))
186 continue;
187
188 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
189 if (slave_dev == NULL) {
190 printk(KERN_ERR "%s[%d]: can't create dsa "
191 "slave device for port %d(%s)\n",
192 dst->master_netdev->name,
193 index, i, pd->port_names[i]);
194 continue;
195 }
196
197 ds->ports[i] = slave_dev;
198 }
199
200 return ds;
201
202out_free:
203 mdiobus_free(ds->slave_mii_bus);
204out:
205 kfree(ds);
206 return ERR_PTR(ret);
207}
208
209static void dsa_switch_destroy(struct dsa_switch *ds)
210{
211}
212
213
214/* link polling *************************************************************/
215static void dsa_link_poll_work(struct work_struct *ugly)
216{
217 struct dsa_switch_tree *dst;
218 int i;
219
220 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
221
222 for (i = 0; i < dst->pd->nr_chips; i++) {
223 struct dsa_switch *ds = dst->ds[i];
224
225 if (ds != NULL && ds->drv->poll_link != NULL)
226 ds->drv->poll_link(ds);
227 }
228
229 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
230}
231
232static void dsa_link_poll_timer(unsigned long _dst)
233{
234 struct dsa_switch_tree *dst = (void *)_dst;
235
236 schedule_work(&dst->link_poll_work);
237}
238
239
240/* platform driver init and cleanup *****************************************/
241static int dev_is_class(struct device *dev, void *class)
242{
243 if (dev->class != NULL && !strcmp(dev->class->name, class))
244 return 1;
245
246 return 0;
247}
248
249static struct device *dev_find_class(struct device *parent, char *class)
250{
251 if (dev_is_class(parent, class)) {
252 get_device(parent);
253 return parent;
254 }
255
256 return device_find_child(parent, class, dev_is_class);
257}
258
259static struct mii_bus *dev_to_mii_bus(struct device *dev)
260{
261 struct device *d;
262
263 d = dev_find_class(dev, "mdio_bus");
264 if (d != NULL) {
265 struct mii_bus *bus;
266
267 bus = to_mii_bus(d);
268 put_device(d);
269
270 return bus;
271 }
272
273 return NULL;
274}
275
276static struct net_device *dev_to_net_device(struct device *dev)
277{
278 struct device *d;
279
280 d = dev_find_class(dev, "net");
281 if (d != NULL) {
282 struct net_device *nd;
283
284 nd = to_net_dev(d);
285 dev_hold(nd);
286 put_device(d);
287
288 return nd;
289 }
290
291 return NULL;
292}
293
294#ifdef CONFIG_OF
295static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
296 struct dsa_chip_data *cd,
297 int chip_index,
298 struct device_node *link)
299{
300 int ret;
301 const __be32 *reg;
302 int link_port_addr;
303 int link_sw_addr;
304 struct device_node *parent_sw;
305 int len;
306
307 parent_sw = of_get_parent(link);
308 if (!parent_sw)
309 return -EINVAL;
310
311 reg = of_get_property(parent_sw, "reg", &len);
312 if (!reg || (len != sizeof(*reg) * 2))
313 return -EINVAL;
314
315 link_sw_addr = be32_to_cpup(reg + 1);
316
317 if (link_sw_addr >= pd->nr_chips)
318 return -EINVAL;
319
320 /* First time routing table allocation */
321 if (!cd->rtable) {
322 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
323 if (!cd->rtable)
324 return -ENOMEM;
325
326 /* default to no valid uplink/downlink */
327 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
328 }
329
330 reg = of_get_property(link, "reg", NULL);
331 if (!reg) {
332 ret = -EINVAL;
333 goto out;
334 }
335
336 link_port_addr = be32_to_cpup(reg);
337
338 cd->rtable[link_sw_addr] = link_port_addr;
339
340 return 0;
341out:
342 kfree(cd->rtable);
343 return ret;
344}
345
346static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
347{
348 int i;
349 int port_index;
350
351 for (i = 0; i < pd->nr_chips; i++) {
352 port_index = 0;
353 while (port_index < DSA_MAX_PORTS) {
354 if (pd->chip[i].port_names[port_index])
355 kfree(pd->chip[i].port_names[port_index]);
356 port_index++;
357 }
358 kfree(pd->chip[i].rtable);
359 }
360 kfree(pd->chip);
361}
362
363static int dsa_of_probe(struct platform_device *pdev)
364{
365 struct device_node *np = pdev->dev.of_node;
366 struct device_node *child, *mdio, *ethernet, *port, *link;
367 struct mii_bus *mdio_bus;
368 struct platform_device *ethernet_dev;
369 struct dsa_platform_data *pd;
370 struct dsa_chip_data *cd;
371 const char *port_name;
372 int chip_index, port_index;
373 const unsigned int *sw_addr, *port_reg;
374 int ret;
375
376 mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
377 if (!mdio)
378 return -EINVAL;
379
380 mdio_bus = of_mdio_find_bus(mdio);
381 if (!mdio_bus)
382 return -EINVAL;
383
384 ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
385 if (!ethernet)
386 return -EINVAL;
387
388 ethernet_dev = of_find_device_by_node(ethernet);
389 if (!ethernet_dev)
390 return -ENODEV;
391
392 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
393 if (!pd)
394 return -ENOMEM;
395
396 pdev->dev.platform_data = pd;
397 pd->netdev = ðernet_dev->dev;
398 pd->nr_chips = of_get_child_count(np);
399 if (pd->nr_chips > DSA_MAX_SWITCHES)
400 pd->nr_chips = DSA_MAX_SWITCHES;
401
402 pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
403 GFP_KERNEL);
404 if (!pd->chip) {
405 ret = -ENOMEM;
406 goto out_free;
407 }
408
409 chip_index = -1;
410 for_each_available_child_of_node(np, child) {
411 chip_index++;
412 cd = &pd->chip[chip_index];
413
414 cd->mii_bus = &mdio_bus->dev;
415
416 sw_addr = of_get_property(child, "reg", NULL);
417 if (!sw_addr)
418 continue;
419
420 cd->sw_addr = be32_to_cpup(sw_addr);
421 if (cd->sw_addr > PHY_MAX_ADDR)
422 continue;
423
424 for_each_available_child_of_node(child, port) {
425 port_reg = of_get_property(port, "reg", NULL);
426 if (!port_reg)
427 continue;
428
429 port_index = be32_to_cpup(port_reg);
430
431 port_name = of_get_property(port, "label", NULL);
432 if (!port_name)
433 continue;
434
435 cd->port_names[port_index] = kstrdup(port_name,
436 GFP_KERNEL);
437 if (!cd->port_names[port_index]) {
438 ret = -ENOMEM;
439 goto out_free_chip;
440 }
441
442 link = of_parse_phandle(port, "link", 0);
443
444 if (!strcmp(port_name, "dsa") && link &&
445 pd->nr_chips > 1) {
446 ret = dsa_of_setup_routing_table(pd, cd,
447 chip_index, link);
448 if (ret)
449 goto out_free_chip;
450 }
451
452 if (port_index == DSA_MAX_PORTS)
453 break;
454 }
455 }
456
457 return 0;
458
459out_free_chip:
460 dsa_of_free_platform_data(pd);
461out_free:
462 kfree(pd);
463 pdev->dev.platform_data = NULL;
464 return ret;
465}
466
467static void dsa_of_remove(struct platform_device *pdev)
468{
469 struct dsa_platform_data *pd = pdev->dev.platform_data;
470
471 if (!pdev->dev.of_node)
472 return;
473
474 dsa_of_free_platform_data(pd);
475 kfree(pd);
476}
477#else
478static inline int dsa_of_probe(struct platform_device *pdev)
479{
480 return 0;
481}
482
483static inline void dsa_of_remove(struct platform_device *pdev)
484{
485}
486#endif
487
488static int dsa_probe(struct platform_device *pdev)
489{
490 static int dsa_version_printed;
491 struct dsa_platform_data *pd = pdev->dev.platform_data;
492 struct net_device *dev;
493 struct dsa_switch_tree *dst;
494 int i, ret;
495
496 if (!dsa_version_printed++)
497 printk(KERN_NOTICE "Distributed Switch Architecture "
498 "driver version %s\n", dsa_driver_version);
499
500 if (pdev->dev.of_node) {
501 ret = dsa_of_probe(pdev);
502 if (ret)
503 return ret;
504
505 pd = pdev->dev.platform_data;
506 }
507
508 if (pd == NULL || pd->netdev == NULL)
509 return -EINVAL;
510
511 dev = dev_to_net_device(pd->netdev);
512 if (dev == NULL) {
513 ret = -EINVAL;
514 goto out;
515 }
516
517 if (dev->dsa_ptr != NULL) {
518 dev_put(dev);
519 ret = -EEXIST;
520 goto out;
521 }
522
523 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
524 if (dst == NULL) {
525 dev_put(dev);
526 ret = -ENOMEM;
527 goto out;
528 }
529
530 platform_set_drvdata(pdev, dst);
531
532 dst->pd = pd;
533 dst->master_netdev = dev;
534 dst->cpu_switch = -1;
535 dst->cpu_port = -1;
536
537 for (i = 0; i < pd->nr_chips; i++) {
538 struct mii_bus *bus;
539 struct dsa_switch *ds;
540
541 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
542 if (bus == NULL) {
543 printk(KERN_ERR "%s[%d]: no mii bus found for "
544 "dsa switch\n", dev->name, i);
545 continue;
546 }
547
548 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
549 if (IS_ERR(ds)) {
550 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
551 "instance (error %ld)\n", dev->name, i,
552 PTR_ERR(ds));
553 continue;
554 }
555
556 dst->ds[i] = ds;
557 if (ds->drv->poll_link != NULL)
558 dst->link_poll_needed = 1;
559 }
560
561 /*
562 * If we use a tagging format that doesn't have an ethertype
563 * field, make sure that all packets from this point on get
564 * sent to the tag format's receive function.
565 */
566 wmb();
567 dev->dsa_ptr = (void *)dst;
568
569 if (dst->link_poll_needed) {
570 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
571 init_timer(&dst->link_poll_timer);
572 dst->link_poll_timer.data = (unsigned long)dst;
573 dst->link_poll_timer.function = dsa_link_poll_timer;
574 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
575 add_timer(&dst->link_poll_timer);
576 }
577
578 return 0;
579
580out:
581 dsa_of_remove(pdev);
582
583 return ret;
584}
585
586static int dsa_remove(struct platform_device *pdev)
587{
588 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
589 int i;
590
591 if (dst->link_poll_needed)
592 del_timer_sync(&dst->link_poll_timer);
593
594 flush_work(&dst->link_poll_work);
595
596 for (i = 0; i < dst->pd->nr_chips; i++) {
597 struct dsa_switch *ds = dst->ds[i];
598
599 if (ds != NULL)
600 dsa_switch_destroy(ds);
601 }
602
603 dsa_of_remove(pdev);
604
605 return 0;
606}
607
608static void dsa_shutdown(struct platform_device *pdev)
609{
610}
611
612static const struct of_device_id dsa_of_match_table[] = {
613 { .compatible = "marvell,dsa", },
614 {}
615};
616MODULE_DEVICE_TABLE(of, dsa_of_match_table);
617
618static struct platform_driver dsa_driver = {
619 .probe = dsa_probe,
620 .remove = dsa_remove,
621 .shutdown = dsa_shutdown,
622 .driver = {
623 .name = "dsa",
624 .owner = THIS_MODULE,
625 .of_match_table = dsa_of_match_table,
626 },
627};
628
629static int __init dsa_init_module(void)
630{
631 int rc;
632
633 rc = platform_driver_register(&dsa_driver);
634 if (rc)
635 return rc;
636
637#ifdef CONFIG_NET_DSA_TAG_DSA
638 dev_add_pack(&dsa_packet_type);
639#endif
640#ifdef CONFIG_NET_DSA_TAG_EDSA
641 dev_add_pack(&edsa_packet_type);
642#endif
643#ifdef CONFIG_NET_DSA_TAG_TRAILER
644 dev_add_pack(&trailer_packet_type);
645#endif
646 return 0;
647}
648module_init(dsa_init_module);
649
650static void __exit dsa_cleanup_module(void)
651{
652#ifdef CONFIG_NET_DSA_TAG_TRAILER
653 dev_remove_pack(&trailer_packet_type);
654#endif
655#ifdef CONFIG_NET_DSA_TAG_EDSA
656 dev_remove_pack(&edsa_packet_type);
657#endif
658#ifdef CONFIG_NET_DSA_TAG_DSA
659 dev_remove_pack(&dsa_packet_type);
660#endif
661 platform_driver_unregister(&dsa_driver);
662}
663module_exit(dsa_cleanup_module);
664
665MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
666MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
667MODULE_LICENSE("GPL");
668MODULE_ALIAS("platform:dsa");