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91da11f8 LB |
1 | /* |
2 | * net/dsa/dsa.c - Hardware switch handling | |
3 | * Copyright (c) 2008 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 <net/dsa.h> | |
15 | #include "dsa_priv.h" | |
16 | ||
17 | char dsa_driver_version[] = "0.1"; | |
18 | ||
19 | ||
20 | /* switch driver registration ***********************************************/ | |
21 | static DEFINE_MUTEX(dsa_switch_drivers_mutex); | |
22 | static LIST_HEAD(dsa_switch_drivers); | |
23 | ||
24 | void register_switch_driver(struct dsa_switch_driver *drv) | |
25 | { | |
26 | mutex_lock(&dsa_switch_drivers_mutex); | |
27 | list_add_tail(&drv->list, &dsa_switch_drivers); | |
28 | mutex_unlock(&dsa_switch_drivers_mutex); | |
29 | } | |
30 | ||
31 | void unregister_switch_driver(struct dsa_switch_driver *drv) | |
32 | { | |
33 | mutex_lock(&dsa_switch_drivers_mutex); | |
34 | list_del_init(&drv->list); | |
35 | mutex_unlock(&dsa_switch_drivers_mutex); | |
36 | } | |
37 | ||
38 | static struct dsa_switch_driver * | |
39 | dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name) | |
40 | { | |
41 | struct dsa_switch_driver *ret; | |
42 | struct list_head *list; | |
43 | char *name; | |
44 | ||
45 | ret = NULL; | |
46 | name = NULL; | |
47 | ||
48 | mutex_lock(&dsa_switch_drivers_mutex); | |
49 | list_for_each(list, &dsa_switch_drivers) { | |
50 | struct dsa_switch_driver *drv; | |
51 | ||
52 | drv = list_entry(list, struct dsa_switch_driver, list); | |
53 | ||
54 | name = drv->probe(bus, sw_addr); | |
55 | if (name != NULL) { | |
56 | ret = drv; | |
57 | break; | |
58 | } | |
59 | } | |
60 | mutex_unlock(&dsa_switch_drivers_mutex); | |
61 | ||
62 | *_name = name; | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | ||
68 | /* basic switch operations **************************************************/ | |
69 | static struct dsa_switch * | |
70 | dsa_switch_setup(struct device *parent, struct dsa_platform_data *pd, | |
71 | struct mii_bus *bus, struct net_device *dev) | |
72 | { | |
73 | struct dsa_switch *ds; | |
74 | int ret; | |
75 | struct dsa_switch_driver *drv; | |
76 | char *name; | |
77 | int i; | |
78 | ||
79 | /* | |
80 | * Probe for switch model. | |
81 | */ | |
82 | drv = dsa_switch_probe(bus, pd->sw_addr, &name); | |
83 | if (drv == NULL) { | |
84 | printk(KERN_ERR "%s: could not detect attached switch\n", | |
85 | dev->name); | |
86 | return ERR_PTR(-EINVAL); | |
87 | } | |
88 | printk(KERN_INFO "%s: detected a %s switch\n", dev->name, name); | |
89 | ||
90 | ||
91 | /* | |
92 | * Allocate and initialise switch state. | |
93 | */ | |
94 | ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL); | |
95 | if (ds == NULL) | |
96 | return ERR_PTR(-ENOMEM); | |
97 | ||
98 | ds->pd = pd; | |
99 | ds->master_netdev = dev; | |
100 | ds->master_mii_bus = bus; | |
101 | ||
102 | ds->drv = drv; | |
103 | ds->tag_protocol = drv->tag_protocol; | |
104 | ||
105 | ||
106 | /* | |
107 | * Validate supplied switch configuration. | |
108 | */ | |
109 | ds->cpu_port = -1; | |
110 | for (i = 0; i < DSA_MAX_PORTS; i++) { | |
111 | char *name; | |
112 | ||
113 | name = pd->port_names[i]; | |
114 | if (name == NULL) | |
115 | continue; | |
116 | ||
117 | if (!strcmp(name, "cpu")) { | |
118 | if (ds->cpu_port != -1) { | |
119 | printk(KERN_ERR "multiple cpu ports?!\n"); | |
120 | ret = -EINVAL; | |
121 | goto out; | |
122 | } | |
123 | ds->cpu_port = i; | |
124 | } else { | |
125 | ds->valid_port_mask |= 1 << i; | |
126 | } | |
127 | } | |
128 | ||
129 | if (ds->cpu_port == -1) { | |
130 | printk(KERN_ERR "no cpu port?!\n"); | |
131 | ret = -EINVAL; | |
132 | goto out; | |
133 | } | |
134 | ||
135 | ||
136 | /* | |
137 | * If we use a tagging format that doesn't have an ethertype | |
138 | * field, make sure that all packets from this point on get | |
139 | * sent to the tag format's receive function. (Which will | |
140 | * discard received packets until we set ds->ports[] below.) | |
141 | */ | |
142 | wmb(); | |
143 | dev->dsa_ptr = (void *)ds; | |
144 | ||
145 | ||
146 | /* | |
147 | * Do basic register setup. | |
148 | */ | |
149 | ret = drv->setup(ds); | |
150 | if (ret < 0) | |
151 | goto out; | |
152 | ||
153 | ret = drv->set_addr(ds, dev->dev_addr); | |
154 | if (ret < 0) | |
155 | goto out; | |
156 | ||
157 | ds->slave_mii_bus = mdiobus_alloc(); | |
158 | if (ds->slave_mii_bus == NULL) { | |
159 | ret = -ENOMEM; | |
160 | goto out; | |
161 | } | |
162 | dsa_slave_mii_bus_init(ds); | |
163 | ||
164 | ret = mdiobus_register(ds->slave_mii_bus); | |
165 | if (ret < 0) | |
166 | goto out_free; | |
167 | ||
168 | ||
169 | /* | |
170 | * Create network devices for physical switch ports. | |
171 | */ | |
172 | wmb(); | |
173 | for (i = 0; i < DSA_MAX_PORTS; i++) { | |
174 | struct net_device *slave_dev; | |
175 | ||
176 | if (!(ds->valid_port_mask & (1 << i))) | |
177 | continue; | |
178 | ||
179 | slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]); | |
180 | if (slave_dev == NULL) { | |
181 | printk(KERN_ERR "%s: can't create dsa slave " | |
182 | "device for port %d(%s)\n", | |
183 | dev->name, i, pd->port_names[i]); | |
184 | continue; | |
185 | } | |
186 | ||
187 | ds->ports[i] = slave_dev; | |
188 | } | |
189 | ||
190 | return ds; | |
191 | ||
192 | out_free: | |
193 | mdiobus_free(ds->slave_mii_bus); | |
194 | out: | |
195 | dev->dsa_ptr = NULL; | |
196 | kfree(ds); | |
197 | return ERR_PTR(ret); | |
198 | } | |
199 | ||
200 | static void dsa_switch_destroy(struct dsa_switch *ds) | |
201 | { | |
202 | } | |
203 | ||
204 | ||
cf85d08f LB |
205 | /* hooks for ethertype-less tagging formats *********************************/ |
206 | /* | |
207 | * The original DSA tag format and some other tag formats have no | |
208 | * ethertype, which means that we need to add a little hack to the | |
209 | * networking receive path to make sure that received frames get | |
210 | * the right ->protocol assigned to them when one of those tag | |
211 | * formats is in use. | |
212 | */ | |
213 | bool dsa_uses_dsa_tags(void *dsa_ptr) | |
214 | { | |
215 | struct dsa_switch *ds = dsa_ptr; | |
216 | ||
217 | return !!(ds->tag_protocol == htons(ETH_P_DSA)); | |
218 | } | |
219 | ||
396138f0 LB |
220 | bool dsa_uses_trailer_tags(void *dsa_ptr) |
221 | { | |
222 | struct dsa_switch *ds = dsa_ptr; | |
223 | ||
224 | return !!(ds->tag_protocol == htons(ETH_P_TRAILER)); | |
225 | } | |
226 | ||
cf85d08f | 227 | |
91da11f8 LB |
228 | /* link polling *************************************************************/ |
229 | static void dsa_link_poll_work(struct work_struct *ugly) | |
230 | { | |
231 | struct dsa_switch *ds; | |
232 | ||
233 | ds = container_of(ugly, struct dsa_switch, link_poll_work); | |
234 | ||
235 | ds->drv->poll_link(ds); | |
236 | mod_timer(&ds->link_poll_timer, round_jiffies(jiffies + HZ)); | |
237 | } | |
238 | ||
239 | static void dsa_link_poll_timer(unsigned long _ds) | |
240 | { | |
241 | struct dsa_switch *ds = (void *)_ds; | |
242 | ||
243 | schedule_work(&ds->link_poll_work); | |
244 | } | |
245 | ||
246 | ||
247 | /* platform driver init and cleanup *****************************************/ | |
248 | static int dev_is_class(struct device *dev, void *class) | |
249 | { | |
250 | if (dev->class != NULL && !strcmp(dev->class->name, class)) | |
251 | return 1; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static struct device *dev_find_class(struct device *parent, char *class) | |
257 | { | |
258 | if (dev_is_class(parent, class)) { | |
259 | get_device(parent); | |
260 | return parent; | |
261 | } | |
262 | ||
263 | return device_find_child(parent, class, dev_is_class); | |
264 | } | |
265 | ||
266 | static struct mii_bus *dev_to_mii_bus(struct device *dev) | |
267 | { | |
268 | struct device *d; | |
269 | ||
270 | d = dev_find_class(dev, "mdio_bus"); | |
271 | if (d != NULL) { | |
272 | struct mii_bus *bus; | |
273 | ||
274 | bus = to_mii_bus(d); | |
275 | put_device(d); | |
276 | ||
277 | return bus; | |
278 | } | |
279 | ||
280 | return NULL; | |
281 | } | |
282 | ||
283 | static struct net_device *dev_to_net_device(struct device *dev) | |
284 | { | |
285 | struct device *d; | |
286 | ||
287 | d = dev_find_class(dev, "net"); | |
288 | if (d != NULL) { | |
289 | struct net_device *nd; | |
290 | ||
291 | nd = to_net_dev(d); | |
292 | dev_hold(nd); | |
293 | put_device(d); | |
294 | ||
295 | return nd; | |
296 | } | |
297 | ||
298 | return NULL; | |
299 | } | |
300 | ||
301 | static int dsa_probe(struct platform_device *pdev) | |
302 | { | |
303 | static int dsa_version_printed; | |
304 | struct dsa_platform_data *pd = pdev->dev.platform_data; | |
305 | struct net_device *dev; | |
306 | struct mii_bus *bus; | |
307 | struct dsa_switch *ds; | |
308 | ||
309 | if (!dsa_version_printed++) | |
310 | printk(KERN_NOTICE "Distributed Switch Architecture " | |
311 | "driver version %s\n", dsa_driver_version); | |
312 | ||
313 | if (pd == NULL || pd->mii_bus == NULL || pd->netdev == NULL) | |
314 | return -EINVAL; | |
315 | ||
316 | bus = dev_to_mii_bus(pd->mii_bus); | |
317 | if (bus == NULL) | |
318 | return -EINVAL; | |
319 | ||
320 | dev = dev_to_net_device(pd->netdev); | |
321 | if (dev == NULL) | |
322 | return -EINVAL; | |
323 | ||
324 | if (dev->dsa_ptr != NULL) { | |
325 | dev_put(dev); | |
326 | return -EEXIST; | |
327 | } | |
328 | ||
329 | ds = dsa_switch_setup(&pdev->dev, pd, bus, dev); | |
330 | if (IS_ERR(ds)) { | |
331 | dev_put(dev); | |
332 | return PTR_ERR(ds); | |
333 | } | |
334 | ||
335 | if (ds->drv->poll_link != NULL) { | |
336 | INIT_WORK(&ds->link_poll_work, dsa_link_poll_work); | |
337 | init_timer(&ds->link_poll_timer); | |
338 | ds->link_poll_timer.data = (unsigned long)ds; | |
339 | ds->link_poll_timer.function = dsa_link_poll_timer; | |
340 | ds->link_poll_timer.expires = round_jiffies(jiffies + HZ); | |
341 | add_timer(&ds->link_poll_timer); | |
342 | } | |
343 | ||
344 | platform_set_drvdata(pdev, ds); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static int dsa_remove(struct platform_device *pdev) | |
350 | { | |
351 | struct dsa_switch *ds = platform_get_drvdata(pdev); | |
352 | ||
353 | if (ds->drv->poll_link != NULL) | |
354 | del_timer_sync(&ds->link_poll_timer); | |
355 | ||
356 | flush_scheduled_work(); | |
357 | ||
358 | dsa_switch_destroy(ds); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static void dsa_shutdown(struct platform_device *pdev) | |
364 | { | |
365 | } | |
366 | ||
367 | static struct platform_driver dsa_driver = { | |
368 | .probe = dsa_probe, | |
369 | .remove = dsa_remove, | |
370 | .shutdown = dsa_shutdown, | |
371 | .driver = { | |
372 | .name = "dsa", | |
373 | .owner = THIS_MODULE, | |
374 | }, | |
375 | }; | |
376 | ||
377 | static int __init dsa_init_module(void) | |
378 | { | |
379 | return platform_driver_register(&dsa_driver); | |
380 | } | |
381 | module_init(dsa_init_module); | |
382 | ||
383 | static void __exit dsa_cleanup_module(void) | |
384 | { | |
385 | platform_driver_unregister(&dsa_driver); | |
386 | } | |
387 | module_exit(dsa_cleanup_module); | |
388 | ||
389 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>") | |
390 | MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); | |
391 | MODULE_LICENSE("GPL"); | |
392 | MODULE_ALIAS("platform:dsa"); |