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91da11f8 LB |
1 | /* |
2 | * net/dsa/dsa.c - Hardware switch handling | |
e84665c9 | 3 | * Copyright (c) 2008-2009 Marvell Semiconductor |
91da11f8 LB |
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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
3a9a231d | 15 | #include <linux/module.h> |
91da11f8 LB |
16 | #include <net/dsa.h> |
17 | #include "dsa_priv.h" | |
18 | ||
19 | char dsa_driver_version[] = "0.1"; | |
20 | ||
21 | ||
22 | /* switch driver registration ***********************************************/ | |
23 | static DEFINE_MUTEX(dsa_switch_drivers_mutex); | |
24 | static LIST_HEAD(dsa_switch_drivers); | |
25 | ||
26 | void register_switch_driver(struct dsa_switch_driver *drv) | |
27 | { | |
28 | mutex_lock(&dsa_switch_drivers_mutex); | |
29 | list_add_tail(&drv->list, &dsa_switch_drivers); | |
30 | mutex_unlock(&dsa_switch_drivers_mutex); | |
31 | } | |
ad293b8a | 32 | EXPORT_SYMBOL_GPL(register_switch_driver); |
91da11f8 LB |
33 | |
34 | void unregister_switch_driver(struct dsa_switch_driver *drv) | |
35 | { | |
36 | mutex_lock(&dsa_switch_drivers_mutex); | |
37 | list_del_init(&drv->list); | |
38 | mutex_unlock(&dsa_switch_drivers_mutex); | |
39 | } | |
ad293b8a | 40 | EXPORT_SYMBOL_GPL(unregister_switch_driver); |
91da11f8 LB |
41 | |
42 | static struct dsa_switch_driver * | |
43 | dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name) | |
44 | { | |
45 | struct dsa_switch_driver *ret; | |
46 | struct list_head *list; | |
47 | char *name; | |
48 | ||
49 | ret = NULL; | |
50 | name = NULL; | |
51 | ||
52 | mutex_lock(&dsa_switch_drivers_mutex); | |
53 | list_for_each(list, &dsa_switch_drivers) { | |
54 | struct dsa_switch_driver *drv; | |
55 | ||
56 | drv = list_entry(list, struct dsa_switch_driver, list); | |
57 | ||
58 | name = drv->probe(bus, sw_addr); | |
59 | if (name != NULL) { | |
60 | ret = drv; | |
61 | break; | |
62 | } | |
63 | } | |
64 | mutex_unlock(&dsa_switch_drivers_mutex); | |
65 | ||
66 | *_name = name; | |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
71 | ||
72 | /* basic switch operations **************************************************/ | |
73 | static struct dsa_switch * | |
e84665c9 LB |
74 | dsa_switch_setup(struct dsa_switch_tree *dst, int index, |
75 | struct device *parent, struct mii_bus *bus) | |
91da11f8 | 76 | { |
e84665c9 LB |
77 | struct dsa_chip_data *pd = dst->pd->chip + index; |
78 | struct dsa_switch_driver *drv; | |
91da11f8 LB |
79 | struct dsa_switch *ds; |
80 | int ret; | |
91da11f8 LB |
81 | char *name; |
82 | int i; | |
83 | ||
84 | /* | |
85 | * Probe for switch model. | |
86 | */ | |
87 | drv = dsa_switch_probe(bus, pd->sw_addr, &name); | |
88 | if (drv == NULL) { | |
e84665c9 LB |
89 | printk(KERN_ERR "%s[%d]: could not detect attached switch\n", |
90 | dst->master_netdev->name, index); | |
91da11f8 LB |
91 | return ERR_PTR(-EINVAL); |
92 | } | |
e84665c9 LB |
93 | printk(KERN_INFO "%s[%d]: detected a %s switch\n", |
94 | dst->master_netdev->name, index, name); | |
91da11f8 LB |
95 | |
96 | ||
97 | /* | |
98 | * Allocate and initialise switch state. | |
99 | */ | |
100 | ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL); | |
101 | if (ds == NULL) | |
102 | return ERR_PTR(-ENOMEM); | |
103 | ||
e84665c9 LB |
104 | ds->dst = dst; |
105 | ds->index = index; | |
106 | ds->pd = dst->pd->chip + index; | |
91da11f8 | 107 | ds->drv = drv; |
e84665c9 | 108 | ds->master_mii_bus = bus; |
91da11f8 LB |
109 | |
110 | ||
111 | /* | |
112 | * Validate supplied switch configuration. | |
113 | */ | |
91da11f8 LB |
114 | for (i = 0; i < DSA_MAX_PORTS; i++) { |
115 | char *name; | |
116 | ||
117 | name = pd->port_names[i]; | |
118 | if (name == NULL) | |
119 | continue; | |
120 | ||
121 | if (!strcmp(name, "cpu")) { | |
e84665c9 | 122 | if (dst->cpu_switch != -1) { |
91da11f8 LB |
123 | printk(KERN_ERR "multiple cpu ports?!\n"); |
124 | ret = -EINVAL; | |
125 | goto out; | |
126 | } | |
e84665c9 LB |
127 | dst->cpu_switch = index; |
128 | dst->cpu_port = i; | |
129 | } else if (!strcmp(name, "dsa")) { | |
130 | ds->dsa_port_mask |= 1 << i; | |
91da11f8 | 131 | } else { |
e84665c9 | 132 | ds->phys_port_mask |= 1 << i; |
91da11f8 LB |
133 | } |
134 | } | |
135 | ||
91da11f8 LB |
136 | |
137 | /* | |
e84665c9 LB |
138 | * If the CPU connects to this switch, set the switch tree |
139 | * tagging protocol to the preferred tagging format of this | |
140 | * switch. | |
91da11f8 | 141 | */ |
e84665c9 LB |
142 | if (ds->dst->cpu_switch == index) |
143 | ds->dst->tag_protocol = drv->tag_protocol; | |
91da11f8 LB |
144 | |
145 | ||
146 | /* | |
147 | * Do basic register setup. | |
148 | */ | |
149 | ret = drv->setup(ds); | |
150 | if (ret < 0) | |
151 | goto out; | |
152 | ||
e84665c9 | 153 | ret = drv->set_addr(ds, dst->master_netdev->dev_addr); |
91da11f8 LB |
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 | */ | |
91da11f8 LB |
172 | for (i = 0; i < DSA_MAX_PORTS; i++) { |
173 | struct net_device *slave_dev; | |
174 | ||
e84665c9 | 175 | if (!(ds->phys_port_mask & (1 << i))) |
91da11f8 LB |
176 | continue; |
177 | ||
178 | slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]); | |
179 | if (slave_dev == NULL) { | |
e84665c9 LB |
180 | printk(KERN_ERR "%s[%d]: can't create dsa " |
181 | "slave device for port %d(%s)\n", | |
182 | dst->master_netdev->name, | |
183 | index, i, pd->port_names[i]); | |
91da11f8 LB |
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: | |
91da11f8 LB |
195 | kfree(ds); |
196 | return ERR_PTR(ret); | |
197 | } | |
198 | ||
199 | static void dsa_switch_destroy(struct dsa_switch *ds) | |
200 | { | |
201 | } | |
202 | ||
203 | ||
204 | /* link polling *************************************************************/ | |
205 | static void dsa_link_poll_work(struct work_struct *ugly) | |
206 | { | |
e84665c9 LB |
207 | struct dsa_switch_tree *dst; |
208 | int i; | |
209 | ||
210 | dst = container_of(ugly, struct dsa_switch_tree, link_poll_work); | |
91da11f8 | 211 | |
e84665c9 LB |
212 | for (i = 0; i < dst->pd->nr_chips; i++) { |
213 | struct dsa_switch *ds = dst->ds[i]; | |
91da11f8 | 214 | |
e84665c9 LB |
215 | if (ds != NULL && ds->drv->poll_link != NULL) |
216 | ds->drv->poll_link(ds); | |
217 | } | |
218 | ||
219 | mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ)); | |
91da11f8 LB |
220 | } |
221 | ||
e84665c9 | 222 | static void dsa_link_poll_timer(unsigned long _dst) |
91da11f8 | 223 | { |
e84665c9 | 224 | struct dsa_switch_tree *dst = (void *)_dst; |
91da11f8 | 225 | |
e84665c9 | 226 | schedule_work(&dst->link_poll_work); |
91da11f8 LB |
227 | } |
228 | ||
229 | ||
230 | /* platform driver init and cleanup *****************************************/ | |
231 | static int dev_is_class(struct device *dev, void *class) | |
232 | { | |
233 | if (dev->class != NULL && !strcmp(dev->class->name, class)) | |
234 | return 1; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static struct device *dev_find_class(struct device *parent, char *class) | |
240 | { | |
241 | if (dev_is_class(parent, class)) { | |
242 | get_device(parent); | |
243 | return parent; | |
244 | } | |
245 | ||
246 | return device_find_child(parent, class, dev_is_class); | |
247 | } | |
248 | ||
249 | static struct mii_bus *dev_to_mii_bus(struct device *dev) | |
250 | { | |
251 | struct device *d; | |
252 | ||
253 | d = dev_find_class(dev, "mdio_bus"); | |
254 | if (d != NULL) { | |
255 | struct mii_bus *bus; | |
256 | ||
257 | bus = to_mii_bus(d); | |
258 | put_device(d); | |
259 | ||
260 | return bus; | |
261 | } | |
262 | ||
263 | return NULL; | |
264 | } | |
265 | ||
266 | static struct net_device *dev_to_net_device(struct device *dev) | |
267 | { | |
268 | struct device *d; | |
269 | ||
270 | d = dev_find_class(dev, "net"); | |
271 | if (d != NULL) { | |
272 | struct net_device *nd; | |
273 | ||
274 | nd = to_net_dev(d); | |
275 | dev_hold(nd); | |
276 | put_device(d); | |
277 | ||
278 | return nd; | |
279 | } | |
280 | ||
281 | return NULL; | |
282 | } | |
283 | ||
284 | static int dsa_probe(struct platform_device *pdev) | |
285 | { | |
286 | static int dsa_version_printed; | |
287 | struct dsa_platform_data *pd = pdev->dev.platform_data; | |
288 | struct net_device *dev; | |
e84665c9 LB |
289 | struct dsa_switch_tree *dst; |
290 | int i; | |
91da11f8 LB |
291 | |
292 | if (!dsa_version_printed++) | |
293 | printk(KERN_NOTICE "Distributed Switch Architecture " | |
294 | "driver version %s\n", dsa_driver_version); | |
295 | ||
e84665c9 | 296 | if (pd == NULL || pd->netdev == NULL) |
91da11f8 LB |
297 | return -EINVAL; |
298 | ||
299 | dev = dev_to_net_device(pd->netdev); | |
300 | if (dev == NULL) | |
301 | return -EINVAL; | |
302 | ||
303 | if (dev->dsa_ptr != NULL) { | |
304 | dev_put(dev); | |
305 | return -EEXIST; | |
306 | } | |
307 | ||
e84665c9 LB |
308 | dst = kzalloc(sizeof(*dst), GFP_KERNEL); |
309 | if (dst == NULL) { | |
91da11f8 | 310 | dev_put(dev); |
e84665c9 | 311 | return -ENOMEM; |
91da11f8 LB |
312 | } |
313 | ||
e84665c9 LB |
314 | platform_set_drvdata(pdev, dst); |
315 | ||
316 | dst->pd = pd; | |
317 | dst->master_netdev = dev; | |
318 | dst->cpu_switch = -1; | |
319 | dst->cpu_port = -1; | |
320 | ||
321 | for (i = 0; i < pd->nr_chips; i++) { | |
322 | struct mii_bus *bus; | |
323 | struct dsa_switch *ds; | |
324 | ||
325 | bus = dev_to_mii_bus(pd->chip[i].mii_bus); | |
326 | if (bus == NULL) { | |
327 | printk(KERN_ERR "%s[%d]: no mii bus found for " | |
328 | "dsa switch\n", dev->name, i); | |
329 | continue; | |
330 | } | |
331 | ||
332 | ds = dsa_switch_setup(dst, i, &pdev->dev, bus); | |
333 | if (IS_ERR(ds)) { | |
334 | printk(KERN_ERR "%s[%d]: couldn't create dsa switch " | |
335 | "instance (error %ld)\n", dev->name, i, | |
336 | PTR_ERR(ds)); | |
337 | continue; | |
338 | } | |
339 | ||
340 | dst->ds[i] = ds; | |
341 | if (ds->drv->poll_link != NULL) | |
342 | dst->link_poll_needed = 1; | |
91da11f8 LB |
343 | } |
344 | ||
e84665c9 LB |
345 | /* |
346 | * If we use a tagging format that doesn't have an ethertype | |
347 | * field, make sure that all packets from this point on get | |
348 | * sent to the tag format's receive function. | |
349 | */ | |
350 | wmb(); | |
351 | dev->dsa_ptr = (void *)dst; | |
352 | ||
353 | if (dst->link_poll_needed) { | |
354 | INIT_WORK(&dst->link_poll_work, dsa_link_poll_work); | |
355 | init_timer(&dst->link_poll_timer); | |
356 | dst->link_poll_timer.data = (unsigned long)dst; | |
357 | dst->link_poll_timer.function = dsa_link_poll_timer; | |
358 | dst->link_poll_timer.expires = round_jiffies(jiffies + HZ); | |
359 | add_timer(&dst->link_poll_timer); | |
360 | } | |
91da11f8 LB |
361 | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static int dsa_remove(struct platform_device *pdev) | |
366 | { | |
e84665c9 LB |
367 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); |
368 | int i; | |
91da11f8 | 369 | |
e84665c9 LB |
370 | if (dst->link_poll_needed) |
371 | del_timer_sync(&dst->link_poll_timer); | |
91da11f8 | 372 | |
7f6b0db9 | 373 | flush_work_sync(&dst->link_poll_work); |
91da11f8 | 374 | |
e84665c9 LB |
375 | for (i = 0; i < dst->pd->nr_chips; i++) { |
376 | struct dsa_switch *ds = dst->ds[i]; | |
377 | ||
378 | if (ds != NULL) | |
379 | dsa_switch_destroy(ds); | |
380 | } | |
91da11f8 LB |
381 | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static void dsa_shutdown(struct platform_device *pdev) | |
386 | { | |
387 | } | |
388 | ||
389 | static struct platform_driver dsa_driver = { | |
390 | .probe = dsa_probe, | |
391 | .remove = dsa_remove, | |
392 | .shutdown = dsa_shutdown, | |
393 | .driver = { | |
394 | .name = "dsa", | |
395 | .owner = THIS_MODULE, | |
396 | }, | |
397 | }; | |
398 | ||
399 | static int __init dsa_init_module(void) | |
400 | { | |
401 | return platform_driver_register(&dsa_driver); | |
402 | } | |
403 | module_init(dsa_init_module); | |
404 | ||
405 | static void __exit dsa_cleanup_module(void) | |
406 | { | |
407 | platform_driver_unregister(&dsa_driver); | |
408 | } | |
409 | module_exit(dsa_cleanup_module); | |
410 | ||
577d6a7c | 411 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); |
91da11f8 LB |
412 | MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); |
413 | MODULE_LICENSE("GPL"); | |
414 | MODULE_ALIAS("platform:dsa"); |