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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 | } | |
32 | ||
33 | void unregister_switch_driver(struct dsa_switch_driver *drv) | |
34 | { | |
35 | mutex_lock(&dsa_switch_drivers_mutex); | |
36 | list_del_init(&drv->list); | |
37 | mutex_unlock(&dsa_switch_drivers_mutex); | |
38 | } | |
39 | ||
40 | static struct dsa_switch_driver * | |
41 | dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name) | |
42 | { | |
43 | struct dsa_switch_driver *ret; | |
44 | struct list_head *list; | |
45 | char *name; | |
46 | ||
47 | ret = NULL; | |
48 | name = NULL; | |
49 | ||
50 | mutex_lock(&dsa_switch_drivers_mutex); | |
51 | list_for_each(list, &dsa_switch_drivers) { | |
52 | struct dsa_switch_driver *drv; | |
53 | ||
54 | drv = list_entry(list, struct dsa_switch_driver, list); | |
55 | ||
56 | name = drv->probe(bus, sw_addr); | |
57 | if (name != NULL) { | |
58 | ret = drv; | |
59 | break; | |
60 | } | |
61 | } | |
62 | mutex_unlock(&dsa_switch_drivers_mutex); | |
63 | ||
64 | *_name = name; | |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
69 | ||
70 | /* basic switch operations **************************************************/ | |
71 | static struct dsa_switch * | |
e84665c9 LB |
72 | dsa_switch_setup(struct dsa_switch_tree *dst, int index, |
73 | struct device *parent, struct mii_bus *bus) | |
91da11f8 | 74 | { |
e84665c9 LB |
75 | struct dsa_chip_data *pd = dst->pd->chip + index; |
76 | struct dsa_switch_driver *drv; | |
91da11f8 LB |
77 | struct dsa_switch *ds; |
78 | int ret; | |
91da11f8 LB |
79 | char *name; |
80 | int i; | |
81 | ||
82 | /* | |
83 | * Probe for switch model. | |
84 | */ | |
85 | drv = dsa_switch_probe(bus, pd->sw_addr, &name); | |
86 | if (drv == NULL) { | |
e84665c9 LB |
87 | printk(KERN_ERR "%s[%d]: could not detect attached switch\n", |
88 | dst->master_netdev->name, index); | |
91da11f8 LB |
89 | return ERR_PTR(-EINVAL); |
90 | } | |
e84665c9 LB |
91 | printk(KERN_INFO "%s[%d]: detected a %s switch\n", |
92 | dst->master_netdev->name, index, name); | |
91da11f8 LB |
93 | |
94 | ||
95 | /* | |
96 | * Allocate and initialise switch state. | |
97 | */ | |
98 | ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL); | |
99 | if (ds == NULL) | |
100 | return ERR_PTR(-ENOMEM); | |
101 | ||
e84665c9 LB |
102 | ds->dst = dst; |
103 | ds->index = index; | |
104 | ds->pd = dst->pd->chip + index; | |
91da11f8 | 105 | ds->drv = drv; |
e84665c9 | 106 | ds->master_mii_bus = bus; |
91da11f8 LB |
107 | |
108 | ||
109 | /* | |
110 | * Validate supplied switch configuration. | |
111 | */ | |
91da11f8 LB |
112 | for (i = 0; i < DSA_MAX_PORTS; i++) { |
113 | char *name; | |
114 | ||
115 | name = pd->port_names[i]; | |
116 | if (name == NULL) | |
117 | continue; | |
118 | ||
119 | if (!strcmp(name, "cpu")) { | |
e84665c9 | 120 | if (dst->cpu_switch != -1) { |
91da11f8 LB |
121 | printk(KERN_ERR "multiple cpu ports?!\n"); |
122 | ret = -EINVAL; | |
123 | goto out; | |
124 | } | |
e84665c9 LB |
125 | dst->cpu_switch = index; |
126 | dst->cpu_port = i; | |
127 | } else if (!strcmp(name, "dsa")) { | |
128 | ds->dsa_port_mask |= 1 << i; | |
91da11f8 | 129 | } else { |
e84665c9 | 130 | ds->phys_port_mask |= 1 << i; |
91da11f8 LB |
131 | } |
132 | } | |
133 | ||
91da11f8 LB |
134 | |
135 | /* | |
e84665c9 LB |
136 | * If the CPU connects to this switch, set the switch tree |
137 | * tagging protocol to the preferred tagging format of this | |
138 | * switch. | |
91da11f8 | 139 | */ |
e84665c9 LB |
140 | if (ds->dst->cpu_switch == index) |
141 | ds->dst->tag_protocol = drv->tag_protocol; | |
91da11f8 LB |
142 | |
143 | ||
144 | /* | |
145 | * Do basic register setup. | |
146 | */ | |
147 | ret = drv->setup(ds); | |
148 | if (ret < 0) | |
149 | goto out; | |
150 | ||
e84665c9 | 151 | ret = drv->set_addr(ds, dst->master_netdev->dev_addr); |
91da11f8 LB |
152 | if (ret < 0) |
153 | goto out; | |
154 | ||
155 | ds->slave_mii_bus = mdiobus_alloc(); | |
156 | if (ds->slave_mii_bus == NULL) { | |
157 | ret = -ENOMEM; | |
158 | goto out; | |
159 | } | |
160 | dsa_slave_mii_bus_init(ds); | |
161 | ||
162 | ret = mdiobus_register(ds->slave_mii_bus); | |
163 | if (ret < 0) | |
164 | goto out_free; | |
165 | ||
166 | ||
167 | /* | |
168 | * Create network devices for physical switch ports. | |
169 | */ | |
91da11f8 LB |
170 | for (i = 0; i < DSA_MAX_PORTS; i++) { |
171 | struct net_device *slave_dev; | |
172 | ||
e84665c9 | 173 | if (!(ds->phys_port_mask & (1 << i))) |
91da11f8 LB |
174 | continue; |
175 | ||
176 | slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]); | |
177 | if (slave_dev == NULL) { | |
e84665c9 LB |
178 | printk(KERN_ERR "%s[%d]: can't create dsa " |
179 | "slave device for port %d(%s)\n", | |
180 | dst->master_netdev->name, | |
181 | index, i, pd->port_names[i]); | |
91da11f8 LB |
182 | continue; |
183 | } | |
184 | ||
185 | ds->ports[i] = slave_dev; | |
186 | } | |
187 | ||
188 | return ds; | |
189 | ||
190 | out_free: | |
191 | mdiobus_free(ds->slave_mii_bus); | |
192 | out: | |
91da11f8 LB |
193 | kfree(ds); |
194 | return ERR_PTR(ret); | |
195 | } | |
196 | ||
197 | static void dsa_switch_destroy(struct dsa_switch *ds) | |
198 | { | |
199 | } | |
200 | ||
201 | ||
202 | /* link polling *************************************************************/ | |
203 | static void dsa_link_poll_work(struct work_struct *ugly) | |
204 | { | |
e84665c9 LB |
205 | struct dsa_switch_tree *dst; |
206 | int i; | |
207 | ||
208 | dst = container_of(ugly, struct dsa_switch_tree, link_poll_work); | |
91da11f8 | 209 | |
e84665c9 LB |
210 | for (i = 0; i < dst->pd->nr_chips; i++) { |
211 | struct dsa_switch *ds = dst->ds[i]; | |
91da11f8 | 212 | |
e84665c9 LB |
213 | if (ds != NULL && ds->drv->poll_link != NULL) |
214 | ds->drv->poll_link(ds); | |
215 | } | |
216 | ||
217 | mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ)); | |
91da11f8 LB |
218 | } |
219 | ||
e84665c9 | 220 | static void dsa_link_poll_timer(unsigned long _dst) |
91da11f8 | 221 | { |
e84665c9 | 222 | struct dsa_switch_tree *dst = (void *)_dst; |
91da11f8 | 223 | |
e84665c9 | 224 | schedule_work(&dst->link_poll_work); |
91da11f8 LB |
225 | } |
226 | ||
227 | ||
228 | /* platform driver init and cleanup *****************************************/ | |
229 | static int dev_is_class(struct device *dev, void *class) | |
230 | { | |
231 | if (dev->class != NULL && !strcmp(dev->class->name, class)) | |
232 | return 1; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static struct device *dev_find_class(struct device *parent, char *class) | |
238 | { | |
239 | if (dev_is_class(parent, class)) { | |
240 | get_device(parent); | |
241 | return parent; | |
242 | } | |
243 | ||
244 | return device_find_child(parent, class, dev_is_class); | |
245 | } | |
246 | ||
247 | static struct mii_bus *dev_to_mii_bus(struct device *dev) | |
248 | { | |
249 | struct device *d; | |
250 | ||
251 | d = dev_find_class(dev, "mdio_bus"); | |
252 | if (d != NULL) { | |
253 | struct mii_bus *bus; | |
254 | ||
255 | bus = to_mii_bus(d); | |
256 | put_device(d); | |
257 | ||
258 | return bus; | |
259 | } | |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
264 | static struct net_device *dev_to_net_device(struct device *dev) | |
265 | { | |
266 | struct device *d; | |
267 | ||
268 | d = dev_find_class(dev, "net"); | |
269 | if (d != NULL) { | |
270 | struct net_device *nd; | |
271 | ||
272 | nd = to_net_dev(d); | |
273 | dev_hold(nd); | |
274 | put_device(d); | |
275 | ||
276 | return nd; | |
277 | } | |
278 | ||
279 | return NULL; | |
280 | } | |
281 | ||
282 | static int dsa_probe(struct platform_device *pdev) | |
283 | { | |
284 | static int dsa_version_printed; | |
285 | struct dsa_platform_data *pd = pdev->dev.platform_data; | |
286 | struct net_device *dev; | |
e84665c9 LB |
287 | struct dsa_switch_tree *dst; |
288 | int i; | |
91da11f8 LB |
289 | |
290 | if (!dsa_version_printed++) | |
291 | printk(KERN_NOTICE "Distributed Switch Architecture " | |
292 | "driver version %s\n", dsa_driver_version); | |
293 | ||
e84665c9 | 294 | if (pd == NULL || pd->netdev == NULL) |
91da11f8 LB |
295 | return -EINVAL; |
296 | ||
297 | dev = dev_to_net_device(pd->netdev); | |
298 | if (dev == NULL) | |
299 | return -EINVAL; | |
300 | ||
301 | if (dev->dsa_ptr != NULL) { | |
302 | dev_put(dev); | |
303 | return -EEXIST; | |
304 | } | |
305 | ||
e84665c9 LB |
306 | dst = kzalloc(sizeof(*dst), GFP_KERNEL); |
307 | if (dst == NULL) { | |
91da11f8 | 308 | dev_put(dev); |
e84665c9 | 309 | return -ENOMEM; |
91da11f8 LB |
310 | } |
311 | ||
e84665c9 LB |
312 | platform_set_drvdata(pdev, dst); |
313 | ||
314 | dst->pd = pd; | |
315 | dst->master_netdev = dev; | |
316 | dst->cpu_switch = -1; | |
317 | dst->cpu_port = -1; | |
318 | ||
319 | for (i = 0; i < pd->nr_chips; i++) { | |
320 | struct mii_bus *bus; | |
321 | struct dsa_switch *ds; | |
322 | ||
323 | bus = dev_to_mii_bus(pd->chip[i].mii_bus); | |
324 | if (bus == NULL) { | |
325 | printk(KERN_ERR "%s[%d]: no mii bus found for " | |
326 | "dsa switch\n", dev->name, i); | |
327 | continue; | |
328 | } | |
329 | ||
330 | ds = dsa_switch_setup(dst, i, &pdev->dev, bus); | |
331 | if (IS_ERR(ds)) { | |
332 | printk(KERN_ERR "%s[%d]: couldn't create dsa switch " | |
333 | "instance (error %ld)\n", dev->name, i, | |
334 | PTR_ERR(ds)); | |
335 | continue; | |
336 | } | |
337 | ||
338 | dst->ds[i] = ds; | |
339 | if (ds->drv->poll_link != NULL) | |
340 | dst->link_poll_needed = 1; | |
91da11f8 LB |
341 | } |
342 | ||
e84665c9 LB |
343 | /* |
344 | * If we use a tagging format that doesn't have an ethertype | |
345 | * field, make sure that all packets from this point on get | |
346 | * sent to the tag format's receive function. | |
347 | */ | |
348 | wmb(); | |
349 | dev->dsa_ptr = (void *)dst; | |
350 | ||
351 | if (dst->link_poll_needed) { | |
352 | INIT_WORK(&dst->link_poll_work, dsa_link_poll_work); | |
353 | init_timer(&dst->link_poll_timer); | |
354 | dst->link_poll_timer.data = (unsigned long)dst; | |
355 | dst->link_poll_timer.function = dsa_link_poll_timer; | |
356 | dst->link_poll_timer.expires = round_jiffies(jiffies + HZ); | |
357 | add_timer(&dst->link_poll_timer); | |
358 | } | |
91da11f8 LB |
359 | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static int dsa_remove(struct platform_device *pdev) | |
364 | { | |
e84665c9 LB |
365 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); |
366 | int i; | |
91da11f8 | 367 | |
e84665c9 LB |
368 | if (dst->link_poll_needed) |
369 | del_timer_sync(&dst->link_poll_timer); | |
91da11f8 | 370 | |
7f6b0db9 | 371 | flush_work_sync(&dst->link_poll_work); |
91da11f8 | 372 | |
e84665c9 LB |
373 | for (i = 0; i < dst->pd->nr_chips; i++) { |
374 | struct dsa_switch *ds = dst->ds[i]; | |
375 | ||
376 | if (ds != NULL) | |
377 | dsa_switch_destroy(ds); | |
378 | } | |
91da11f8 LB |
379 | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static void dsa_shutdown(struct platform_device *pdev) | |
384 | { | |
385 | } | |
386 | ||
387 | static struct platform_driver dsa_driver = { | |
388 | .probe = dsa_probe, | |
389 | .remove = dsa_remove, | |
390 | .shutdown = dsa_shutdown, | |
391 | .driver = { | |
392 | .name = "dsa", | |
393 | .owner = THIS_MODULE, | |
394 | }, | |
395 | }; | |
396 | ||
397 | static int __init dsa_init_module(void) | |
398 | { | |
399 | return platform_driver_register(&dsa_driver); | |
400 | } | |
401 | module_init(dsa_init_module); | |
402 | ||
403 | static void __exit dsa_cleanup_module(void) | |
404 | { | |
405 | platform_driver_unregister(&dsa_driver); | |
406 | } | |
407 | module_exit(dsa_cleanup_module); | |
408 | ||
577d6a7c | 409 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); |
91da11f8 LB |
410 | MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); |
411 | MODULE_LICENSE("GPL"); | |
412 | MODULE_ALIAS("platform:dsa"); |