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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
87/* Function takes a reference on the module owning the tagger,
88 * so dsa_tag_driver_put must be called afterwards.
89 */
90const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf)
91{
92 const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
93 struct dsa_tag_driver *dsa_tag_driver;
94
95 mutex_lock(&dsa_tag_drivers_lock);
96 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
97 const struct dsa_device_ops *tmp = dsa_tag_driver->ops;
98
99 if (!sysfs_streq(buf, tmp->name))
100 continue;
101
102 if (!try_module_get(dsa_tag_driver->owner))
103 break;
104
105 ops = tmp;
106 break;
107 }
108 mutex_unlock(&dsa_tag_drivers_lock);
109
110 return ops;
111}
112
113const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
114{
115 struct dsa_tag_driver *dsa_tag_driver;
116 const struct dsa_device_ops *ops;
117 bool found = false;
118
119 request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);
120
121 mutex_lock(&dsa_tag_drivers_lock);
122 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
123 ops = dsa_tag_driver->ops;
124 if (ops->proto == tag_protocol) {
125 found = true;
126 break;
127 }
128 }
129
130 if (found) {
131 if (!try_module_get(dsa_tag_driver->owner))
132 ops = ERR_PTR(-ENOPROTOOPT);
133 } else {
134 ops = ERR_PTR(-ENOPROTOOPT);
135 }
136
137 mutex_unlock(&dsa_tag_drivers_lock);
138
139 return ops;
140}
141
142void dsa_tag_driver_put(const struct dsa_device_ops *ops)
143{
144 struct dsa_tag_driver *dsa_tag_driver;
145
146 mutex_lock(&dsa_tag_drivers_lock);
147 list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
148 if (dsa_tag_driver->ops == ops) {
149 module_put(dsa_tag_driver->owner);
150 break;
151 }
152 }
153 mutex_unlock(&dsa_tag_drivers_lock);
154}
155
156static int dev_is_class(struct device *dev, void *class)
157{
158 if (dev->class != NULL && !strcmp(dev->class->name, class))
159 return 1;
160
161 return 0;
162}
163
164static struct device *dev_find_class(struct device *parent, char *class)
165{
166 if (dev_is_class(parent, class)) {
167 get_device(parent);
168 return parent;
169 }
170
171 return device_find_child(parent, class, dev_is_class);
172}
173
174struct net_device *dsa_dev_to_net_device(struct device *dev)
175{
176 struct device *d;
177
178 d = dev_find_class(dev, "net");
179 if (d != NULL) {
180 struct net_device *nd;
181
182 nd = to_net_dev(d);
183 dev_hold(nd);
184 put_device(d);
185
186 return nd;
187 }
188
189 return NULL;
190}
191EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
192
193/* Determine if we should defer delivery of skb until we have a rx timestamp.
194 *
195 * Called from dsa_switch_rcv. For now, this will only work if tagging is
196 * enabled on the switch. Normally the MAC driver would retrieve the hardware
197 * timestamp when it reads the packet out of the hardware. However in a DSA
198 * switch, the DSA driver owning the interface to which the packet is
199 * delivered is never notified unless we do so here.
200 */
201static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
202 struct sk_buff *skb)
203{
204 struct dsa_switch *ds = p->dp->ds;
205 unsigned int type;
206
207 if (skb_headroom(skb) < ETH_HLEN)
208 return false;
209
210 __skb_push(skb, ETH_HLEN);
211
212 type = ptp_classify_raw(skb);
213
214 __skb_pull(skb, ETH_HLEN);
215
216 if (type == PTP_CLASS_NONE)
217 return false;
218
219 if (likely(ds->ops->port_rxtstamp))
220 return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
221
222 return false;
223}
224
225static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
226 struct packet_type *pt, struct net_device *unused)
227{
228 struct dsa_port *cpu_dp = dev->dsa_ptr;
229 struct sk_buff *nskb = NULL;
230 struct dsa_slave_priv *p;
231
232 if (unlikely(!cpu_dp)) {
233 kfree_skb(skb);
234 return 0;
235 }
236
237 skb = skb_unshare(skb, GFP_ATOMIC);
238 if (!skb)
239 return 0;
240
241 nskb = cpu_dp->rcv(skb, dev, pt);
242 if (!nskb) {
243 kfree_skb(skb);
244 return 0;
245 }
246
247 skb = nskb;
248 skb_push(skb, ETH_HLEN);
249 skb->pkt_type = PACKET_HOST;
250 skb->protocol = eth_type_trans(skb, skb->dev);
251
252 if (unlikely(!dsa_slave_dev_check(skb->dev))) {
253 /* Packet is to be injected directly on an upper
254 * device, e.g. a team/bond, so skip all DSA-port
255 * specific actions.
256 */
257 netif_rx(skb);
258 return 0;
259 }
260
261 p = netdev_priv(skb->dev);
262
263 if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
264 nskb = dsa_untag_bridge_pvid(skb);
265 if (!nskb) {
266 kfree_skb(skb);
267 return 0;
268 }
269 skb = nskb;
270 }
271
272 dev_sw_netstats_rx_add(skb->dev, skb->len);
273
274 if (dsa_skb_defer_rx_timestamp(p, skb))
275 return 0;
276
277 gro_cells_receive(&p->gcells, skb);
278
279 return 0;
280}
281
282#ifdef CONFIG_PM_SLEEP
283static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
284{
285 const struct dsa_port *dp = dsa_to_port(ds, p);
286
287 return dp->type == DSA_PORT_TYPE_USER && dp->slave;
288}
289
290int dsa_switch_suspend(struct dsa_switch *ds)
291{
292 int i, ret = 0;
293
294 /* Suspend slave network devices */
295 for (i = 0; i < ds->num_ports; i++) {
296 if (!dsa_is_port_initialized(ds, i))
297 continue;
298
299 ret = dsa_slave_suspend(dsa_to_port(ds, i)->slave);
300 if (ret)
301 return ret;
302 }
303
304 if (ds->ops->suspend)
305 ret = ds->ops->suspend(ds);
306
307 return ret;
308}
309EXPORT_SYMBOL_GPL(dsa_switch_suspend);
310
311int dsa_switch_resume(struct dsa_switch *ds)
312{
313 int i, ret = 0;
314
315 if (ds->ops->resume)
316 ret = ds->ops->resume(ds);
317
318 if (ret)
319 return ret;
320
321 /* Resume slave network devices */
322 for (i = 0; i < ds->num_ports; i++) {
323 if (!dsa_is_port_initialized(ds, i))
324 continue;
325
326 ret = dsa_slave_resume(dsa_to_port(ds, i)->slave);
327 if (ret)
328 return ret;
329 }
330
331 return 0;
332}
333EXPORT_SYMBOL_GPL(dsa_switch_resume);
334#endif
335
336static struct packet_type dsa_pack_type __read_mostly = {
337 .type = cpu_to_be16(ETH_P_XDSA),
338 .func = dsa_switch_rcv,
339};
340
341static struct workqueue_struct *dsa_owq;
342
343bool dsa_schedule_work(struct work_struct *work)
344{
345 return queue_work(dsa_owq, work);
346}
347
348void dsa_flush_workqueue(void)
349{
350 flush_workqueue(dsa_owq);
351}
352
353int dsa_devlink_param_get(struct devlink *dl, u32 id,
354 struct devlink_param_gset_ctx *ctx)
355{
356 struct dsa_switch *ds = dsa_devlink_to_ds(dl);
357
358 if (!ds->ops->devlink_param_get)
359 return -EOPNOTSUPP;
360
361 return ds->ops->devlink_param_get(ds, id, ctx);
362}
363EXPORT_SYMBOL_GPL(dsa_devlink_param_get);
364
365int dsa_devlink_param_set(struct devlink *dl, u32 id,
366 struct devlink_param_gset_ctx *ctx)
367{
368 struct dsa_switch *ds = dsa_devlink_to_ds(dl);
369
370 if (!ds->ops->devlink_param_set)
371 return -EOPNOTSUPP;
372
373 return ds->ops->devlink_param_set(ds, id, ctx);
374}
375EXPORT_SYMBOL_GPL(dsa_devlink_param_set);
376
377int dsa_devlink_params_register(struct dsa_switch *ds,
378 const struct devlink_param *params,
379 size_t params_count)
380{
381 return devlink_params_register(ds->devlink, params, params_count);
382}
383EXPORT_SYMBOL_GPL(dsa_devlink_params_register);
384
385void dsa_devlink_params_unregister(struct dsa_switch *ds,
386 const struct devlink_param *params,
387 size_t params_count)
388{
389 devlink_params_unregister(ds->devlink, params, params_count);
390}
391EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);
392
393int dsa_devlink_resource_register(struct dsa_switch *ds,
394 const char *resource_name,
395 u64 resource_size,
396 u64 resource_id,
397 u64 parent_resource_id,
398 const struct devlink_resource_size_params *size_params)
399{
400 return devlink_resource_register(ds->devlink, resource_name,
401 resource_size, resource_id,
402 parent_resource_id,
403 size_params);
404}
405EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);
406
407void dsa_devlink_resources_unregister(struct dsa_switch *ds)
408{
409 devlink_resources_unregister(ds->devlink, NULL);
410}
411EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);
412
413void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
414 u64 resource_id,
415 devlink_resource_occ_get_t *occ_get,
416 void *occ_get_priv)
417{
418 return devlink_resource_occ_get_register(ds->devlink, resource_id,
419 occ_get, occ_get_priv);
420}
421EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register);
422
423void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
424 u64 resource_id)
425{
426 devlink_resource_occ_get_unregister(ds->devlink, resource_id);
427}
428EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister);
429
430struct devlink_region *
431dsa_devlink_region_create(struct dsa_switch *ds,
432 const struct devlink_region_ops *ops,
433 u32 region_max_snapshots, u64 region_size)
434{
435 return devlink_region_create(ds->devlink, ops, region_max_snapshots,
436 region_size);
437}
438EXPORT_SYMBOL_GPL(dsa_devlink_region_create);
439
440struct devlink_region *
441dsa_devlink_port_region_create(struct dsa_switch *ds,
442 int port,
443 const struct devlink_port_region_ops *ops,
444 u32 region_max_snapshots, u64 region_size)
445{
446 struct dsa_port *dp = dsa_to_port(ds, port);
447
448 return devlink_port_region_create(&dp->devlink_port, ops,
449 region_max_snapshots,
450 region_size);
451}
452EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create);
453
454void dsa_devlink_region_destroy(struct devlink_region *region)
455{
456 devlink_region_destroy(region);
457}
458EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy);
459
460struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
461{
462 if (!netdev || !dsa_slave_dev_check(netdev))
463 return ERR_PTR(-ENODEV);
464
465 return dsa_slave_to_port(netdev);
466}
467EXPORT_SYMBOL_GPL(dsa_port_from_netdev);
468
469static int __init dsa_init_module(void)
470{
471 int rc;
472
473 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
474 WQ_MEM_RECLAIM);
475 if (!dsa_owq)
476 return -ENOMEM;
477
478 rc = dsa_slave_register_notifier();
479 if (rc)
480 goto register_notifier_fail;
481
482 dev_add_pack(&dsa_pack_type);
483
484 dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
485 THIS_MODULE);
486
487 return 0;
488
489register_notifier_fail:
490 destroy_workqueue(dsa_owq);
491
492 return rc;
493}
494module_init(dsa_init_module);
495
496static void __exit dsa_cleanup_module(void)
497{
498 dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));
499
500 dsa_slave_unregister_notifier();
501 dev_remove_pack(&dsa_pack_type);
502 destroy_workqueue(dsa_owq);
503}
504module_exit(dsa_cleanup_module);
505
506MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
507MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
508MODULE_LICENSE("GPL");
509MODULE_ALIAS("platform:dsa");
1/*
2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11#include <linux/list.h>
12#include <linux/netdevice.h>
13#include <linux/platform_device.h>
14#include <linux/slab.h>
15#include <net/dsa.h>
16#include "dsa_priv.h"
17
18char dsa_driver_version[] = "0.1";
19
20
21/* switch driver registration ***********************************************/
22static DEFINE_MUTEX(dsa_switch_drivers_mutex);
23static LIST_HEAD(dsa_switch_drivers);
24
25void register_switch_driver(struct dsa_switch_driver *drv)
26{
27 mutex_lock(&dsa_switch_drivers_mutex);
28 list_add_tail(&drv->list, &dsa_switch_drivers);
29 mutex_unlock(&dsa_switch_drivers_mutex);
30}
31
32void unregister_switch_driver(struct dsa_switch_driver *drv)
33{
34 mutex_lock(&dsa_switch_drivers_mutex);
35 list_del_init(&drv->list);
36 mutex_unlock(&dsa_switch_drivers_mutex);
37}
38
39static struct dsa_switch_driver *
40dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
41{
42 struct dsa_switch_driver *ret;
43 struct list_head *list;
44 char *name;
45
46 ret = NULL;
47 name = NULL;
48
49 mutex_lock(&dsa_switch_drivers_mutex);
50 list_for_each(list, &dsa_switch_drivers) {
51 struct dsa_switch_driver *drv;
52
53 drv = list_entry(list, struct dsa_switch_driver, list);
54
55 name = drv->probe(bus, sw_addr);
56 if (name != NULL) {
57 ret = drv;
58 break;
59 }
60 }
61 mutex_unlock(&dsa_switch_drivers_mutex);
62
63 *_name = name;
64
65 return ret;
66}
67
68
69/* basic switch operations **************************************************/
70static struct dsa_switch *
71dsa_switch_setup(struct dsa_switch_tree *dst, int index,
72 struct device *parent, struct mii_bus *bus)
73{
74 struct dsa_chip_data *pd = dst->pd->chip + index;
75 struct dsa_switch_driver *drv;
76 struct dsa_switch *ds;
77 int ret;
78 char *name;
79 int i;
80
81 /*
82 * Probe for switch model.
83 */
84 drv = dsa_switch_probe(bus, pd->sw_addr, &name);
85 if (drv == NULL) {
86 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
87 dst->master_netdev->name, index);
88 return ERR_PTR(-EINVAL);
89 }
90 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
91 dst->master_netdev->name, index, name);
92
93
94 /*
95 * Allocate and initialise switch state.
96 */
97 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
98 if (ds == NULL)
99 return ERR_PTR(-ENOMEM);
100
101 ds->dst = dst;
102 ds->index = index;
103 ds->pd = dst->pd->chip + index;
104 ds->drv = drv;
105 ds->master_mii_bus = bus;
106
107
108 /*
109 * Validate supplied switch configuration.
110 */
111 for (i = 0; i < DSA_MAX_PORTS; i++) {
112 char *name;
113
114 name = pd->port_names[i];
115 if (name == NULL)
116 continue;
117
118 if (!strcmp(name, "cpu")) {
119 if (dst->cpu_switch != -1) {
120 printk(KERN_ERR "multiple cpu ports?!\n");
121 ret = -EINVAL;
122 goto out;
123 }
124 dst->cpu_switch = index;
125 dst->cpu_port = i;
126 } else if (!strcmp(name, "dsa")) {
127 ds->dsa_port_mask |= 1 << i;
128 } else {
129 ds->phys_port_mask |= 1 << i;
130 }
131 }
132
133
134 /*
135 * If the CPU connects to this switch, set the switch tree
136 * tagging protocol to the preferred tagging format of this
137 * switch.
138 */
139 if (ds->dst->cpu_switch == index)
140 ds->dst->tag_protocol = drv->tag_protocol;
141
142
143 /*
144 * Do basic register setup.
145 */
146 ret = drv->setup(ds);
147 if (ret < 0)
148 goto out;
149
150 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
151 if (ret < 0)
152 goto out;
153
154 ds->slave_mii_bus = mdiobus_alloc();
155 if (ds->slave_mii_bus == NULL) {
156 ret = -ENOMEM;
157 goto out;
158 }
159 dsa_slave_mii_bus_init(ds);
160
161 ret = mdiobus_register(ds->slave_mii_bus);
162 if (ret < 0)
163 goto out_free;
164
165
166 /*
167 * Create network devices for physical switch ports.
168 */
169 for (i = 0; i < DSA_MAX_PORTS; i++) {
170 struct net_device *slave_dev;
171
172 if (!(ds->phys_port_mask & (1 << i)))
173 continue;
174
175 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
176 if (slave_dev == NULL) {
177 printk(KERN_ERR "%s[%d]: can't create dsa "
178 "slave device for port %d(%s)\n",
179 dst->master_netdev->name,
180 index, i, pd->port_names[i]);
181 continue;
182 }
183
184 ds->ports[i] = slave_dev;
185 }
186
187 return ds;
188
189out_free:
190 mdiobus_free(ds->slave_mii_bus);
191out:
192 kfree(ds);
193 return ERR_PTR(ret);
194}
195
196static void dsa_switch_destroy(struct dsa_switch *ds)
197{
198}
199
200
201/* hooks for ethertype-less tagging formats *********************************/
202/*
203 * The original DSA tag format and some other tag formats have no
204 * ethertype, which means that we need to add a little hack to the
205 * networking receive path to make sure that received frames get
206 * the right ->protocol assigned to them when one of those tag
207 * formats is in use.
208 */
209bool dsa_uses_dsa_tags(void *dsa_ptr)
210{
211 struct dsa_switch_tree *dst = dsa_ptr;
212
213 return !!(dst->tag_protocol == htons(ETH_P_DSA));
214}
215
216bool dsa_uses_trailer_tags(void *dsa_ptr)
217{
218 struct dsa_switch_tree *dst = dsa_ptr;
219
220 return !!(dst->tag_protocol == htons(ETH_P_TRAILER));
221}
222
223
224/* link polling *************************************************************/
225static void dsa_link_poll_work(struct work_struct *ugly)
226{
227 struct dsa_switch_tree *dst;
228 int i;
229
230 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
231
232 for (i = 0; i < dst->pd->nr_chips; i++) {
233 struct dsa_switch *ds = dst->ds[i];
234
235 if (ds != NULL && ds->drv->poll_link != NULL)
236 ds->drv->poll_link(ds);
237 }
238
239 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
240}
241
242static void dsa_link_poll_timer(unsigned long _dst)
243{
244 struct dsa_switch_tree *dst = (void *)_dst;
245
246 schedule_work(&dst->link_poll_work);
247}
248
249
250/* platform driver init and cleanup *****************************************/
251static int dev_is_class(struct device *dev, void *class)
252{
253 if (dev->class != NULL && !strcmp(dev->class->name, class))
254 return 1;
255
256 return 0;
257}
258
259static struct device *dev_find_class(struct device *parent, char *class)
260{
261 if (dev_is_class(parent, class)) {
262 get_device(parent);
263 return parent;
264 }
265
266 return device_find_child(parent, class, dev_is_class);
267}
268
269static struct mii_bus *dev_to_mii_bus(struct device *dev)
270{
271 struct device *d;
272
273 d = dev_find_class(dev, "mdio_bus");
274 if (d != NULL) {
275 struct mii_bus *bus;
276
277 bus = to_mii_bus(d);
278 put_device(d);
279
280 return bus;
281 }
282
283 return NULL;
284}
285
286static struct net_device *dev_to_net_device(struct device *dev)
287{
288 struct device *d;
289
290 d = dev_find_class(dev, "net");
291 if (d != NULL) {
292 struct net_device *nd;
293
294 nd = to_net_dev(d);
295 dev_hold(nd);
296 put_device(d);
297
298 return nd;
299 }
300
301 return NULL;
302}
303
304static int dsa_probe(struct platform_device *pdev)
305{
306 static int dsa_version_printed;
307 struct dsa_platform_data *pd = pdev->dev.platform_data;
308 struct net_device *dev;
309 struct dsa_switch_tree *dst;
310 int i;
311
312 if (!dsa_version_printed++)
313 printk(KERN_NOTICE "Distributed Switch Architecture "
314 "driver version %s\n", dsa_driver_version);
315
316 if (pd == NULL || pd->netdev == NULL)
317 return -EINVAL;
318
319 dev = dev_to_net_device(pd->netdev);
320 if (dev == NULL)
321 return -EINVAL;
322
323 if (dev->dsa_ptr != NULL) {
324 dev_put(dev);
325 return -EEXIST;
326 }
327
328 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
329 if (dst == NULL) {
330 dev_put(dev);
331 return -ENOMEM;
332 }
333
334 platform_set_drvdata(pdev, dst);
335
336 dst->pd = pd;
337 dst->master_netdev = dev;
338 dst->cpu_switch = -1;
339 dst->cpu_port = -1;
340
341 for (i = 0; i < pd->nr_chips; i++) {
342 struct mii_bus *bus;
343 struct dsa_switch *ds;
344
345 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
346 if (bus == NULL) {
347 printk(KERN_ERR "%s[%d]: no mii bus found for "
348 "dsa switch\n", dev->name, i);
349 continue;
350 }
351
352 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
353 if (IS_ERR(ds)) {
354 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
355 "instance (error %ld)\n", dev->name, i,
356 PTR_ERR(ds));
357 continue;
358 }
359
360 dst->ds[i] = ds;
361 if (ds->drv->poll_link != NULL)
362 dst->link_poll_needed = 1;
363 }
364
365 /*
366 * If we use a tagging format that doesn't have an ethertype
367 * field, make sure that all packets from this point on get
368 * sent to the tag format's receive function.
369 */
370 wmb();
371 dev->dsa_ptr = (void *)dst;
372
373 if (dst->link_poll_needed) {
374 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
375 init_timer(&dst->link_poll_timer);
376 dst->link_poll_timer.data = (unsigned long)dst;
377 dst->link_poll_timer.function = dsa_link_poll_timer;
378 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
379 add_timer(&dst->link_poll_timer);
380 }
381
382 return 0;
383}
384
385static int dsa_remove(struct platform_device *pdev)
386{
387 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
388 int i;
389
390 if (dst->link_poll_needed)
391 del_timer_sync(&dst->link_poll_timer);
392
393 flush_work_sync(&dst->link_poll_work);
394
395 for (i = 0; i < dst->pd->nr_chips; i++) {
396 struct dsa_switch *ds = dst->ds[i];
397
398 if (ds != NULL)
399 dsa_switch_destroy(ds);
400 }
401
402 return 0;
403}
404
405static void dsa_shutdown(struct platform_device *pdev)
406{
407}
408
409static struct platform_driver dsa_driver = {
410 .probe = dsa_probe,
411 .remove = dsa_remove,
412 .shutdown = dsa_shutdown,
413 .driver = {
414 .name = "dsa",
415 .owner = THIS_MODULE,
416 },
417};
418
419static int __init dsa_init_module(void)
420{
421 return platform_driver_register(&dsa_driver);
422}
423module_init(dsa_init_module);
424
425static void __exit dsa_cleanup_module(void)
426{
427 platform_driver_unregister(&dsa_driver);
428}
429module_exit(dsa_cleanup_module);
430
431MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
432MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
433MODULE_LICENSE("GPL");
434MODULE_ALIAS("platform:dsa");