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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
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
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
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
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
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
149
150
151
152 if (ds->dst->cpu_switch == index)
153 ds->dst->tag_protocol = drv->tag_protocol;
154
155
156
157
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
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
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
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
321 if (!cd->rtable) {
322 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
323 if (!cd->rtable)
324 return -ENOMEM;
325
326
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 = 0;
410 for_each_available_child_of_node(np, child) {
411 cd = &pd->chip[chip_index];
412
413 cd->mii_bus = &mdio_bus->dev;
414
415 sw_addr = of_get_property(child, "reg", NULL);
416 if (!sw_addr)
417 continue;
418
419 cd->sw_addr = be32_to_cpup(sw_addr);
420 if (cd->sw_addr > PHY_MAX_ADDR)
421 continue;
422
423 for_each_available_child_of_node(child, port) {
424 port_reg = of_get_property(port, "reg", NULL);
425 if (!port_reg)
426 continue;
427
428 port_index = be32_to_cpup(port_reg);
429
430 port_name = of_get_property(port, "label", NULL);
431 if (!port_name)
432 continue;
433
434 cd->port_names[port_index] = kstrdup(port_name,
435 GFP_KERNEL);
436 if (!cd->port_names[port_index]) {
437 ret = -ENOMEM;
438 goto out_free_chip;
439 }
440
441 link = of_parse_phandle(port, "link", 0);
442
443 if (!strcmp(port_name, "dsa") && link &&
444 pd->nr_chips > 1) {
445 ret = dsa_of_setup_routing_table(pd, cd,
446 chip_index, link);
447 if (ret)
448 goto out_free_chip;
449 }
450
451 if (port_index == DSA_MAX_PORTS)
452 break;
453 }
454 }
455
456 return 0;
457
458out_free_chip:
459 dsa_of_free_platform_data(pd);
460out_free:
461 kfree(pd);
462 pdev->dev.platform_data = NULL;
463 return ret;
464}
465
466static void dsa_of_remove(struct platform_device *pdev)
467{
468 struct dsa_platform_data *pd = pdev->dev.platform_data;
469
470 if (!pdev->dev.of_node)
471 return;
472
473 dsa_of_free_platform_data(pd);
474 kfree(pd);
475}
476#else
477static inline int dsa_of_probe(struct platform_device *pdev)
478{
479 return 0;
480}
481
482static inline void dsa_of_remove(struct platform_device *pdev)
483{
484}
485#endif
486
487static int dsa_probe(struct platform_device *pdev)
488{
489 static int dsa_version_printed;
490 struct dsa_platform_data *pd = pdev->dev.platform_data;
491 struct net_device *dev;
492 struct dsa_switch_tree *dst;
493 int i, ret;
494
495 if (!dsa_version_printed++)
496 printk(KERN_NOTICE "Distributed Switch Architecture "
497 "driver version %s\n", dsa_driver_version);
498
499 if (pdev->dev.of_node) {
500 ret = dsa_of_probe(pdev);
501 if (ret)
502 return ret;
503
504 pd = pdev->dev.platform_data;
505 }
506
507 if (pd == NULL || pd->netdev == NULL)
508 return -EINVAL;
509
510 dev = dev_to_net_device(pd->netdev);
511 if (dev == NULL) {
512 ret = -EINVAL;
513 goto out;
514 }
515
516 if (dev->dsa_ptr != NULL) {
517 dev_put(dev);
518 ret = -EEXIST;
519 goto out;
520 }
521
522 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
523 if (dst == NULL) {
524 dev_put(dev);
525 ret = -ENOMEM;
526 goto out;
527 }
528
529 platform_set_drvdata(pdev, dst);
530
531 dst->pd = pd;
532 dst->master_netdev = dev;
533 dst->cpu_switch = -1;
534 dst->cpu_port = -1;
535
536 for (i = 0; i < pd->nr_chips; i++) {
537 struct mii_bus *bus;
538 struct dsa_switch *ds;
539
540 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
541 if (bus == NULL) {
542 printk(KERN_ERR "%s[%d]: no mii bus found for "
543 "dsa switch\n", dev->name, i);
544 continue;
545 }
546
547 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
548 if (IS_ERR(ds)) {
549 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
550 "instance (error %ld)\n", dev->name, i,
551 PTR_ERR(ds));
552 continue;
553 }
554
555 dst->ds[i] = ds;
556 if (ds->drv->poll_link != NULL)
557 dst->link_poll_needed = 1;
558 }
559
560
561
562
563
564
565 wmb();
566 dev->dsa_ptr = (void *)dst;
567
568 if (dst->link_poll_needed) {
569 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
570 init_timer(&dst->link_poll_timer);
571 dst->link_poll_timer.data = (unsigned long)dst;
572 dst->link_poll_timer.function = dsa_link_poll_timer;
573 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
574 add_timer(&dst->link_poll_timer);
575 }
576
577 return 0;
578
579out:
580 dsa_of_remove(pdev);
581
582 return ret;
583}
584
585static int dsa_remove(struct platform_device *pdev)
586{
587 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
588 int i;
589
590 if (dst->link_poll_needed)
591 del_timer_sync(&dst->link_poll_timer);
592
593 flush_work(&dst->link_poll_work);
594
595 for (i = 0; i < dst->pd->nr_chips; i++) {
596 struct dsa_switch *ds = dst->ds[i];
597
598 if (ds != NULL)
599 dsa_switch_destroy(ds);
600 }
601
602 dsa_of_remove(pdev);
603
604 return 0;
605}
606
607static void dsa_shutdown(struct platform_device *pdev)
608{
609}
610
611static const struct of_device_id dsa_of_match_table[] = {
612 { .compatible = "marvell,dsa", },
613 {}
614};
615MODULE_DEVICE_TABLE(of, dsa_of_match_table);
616
617static struct platform_driver dsa_driver = {
618 .probe = dsa_probe,
619 .remove = dsa_remove,
620 .shutdown = dsa_shutdown,
621 .driver = {
622 .name = "dsa",
623 .owner = THIS_MODULE,
624 .of_match_table = dsa_of_match_table,
625 },
626};
627
628static int __init dsa_init_module(void)
629{
630 int rc;
631
632 rc = platform_driver_register(&dsa_driver);
633 if (rc)
634 return rc;
635
636#ifdef CONFIG_NET_DSA_TAG_DSA
637 dev_add_pack(&dsa_packet_type);
638#endif
639#ifdef CONFIG_NET_DSA_TAG_EDSA
640 dev_add_pack(&edsa_packet_type);
641#endif
642#ifdef CONFIG_NET_DSA_TAG_TRAILER
643 dev_add_pack(&trailer_packet_type);
644#endif
645 return 0;
646}
647module_init(dsa_init_module);
648
649static void __exit dsa_cleanup_module(void)
650{
651#ifdef CONFIG_NET_DSA_TAG_TRAILER
652 dev_remove_pack(&trailer_packet_type);
653#endif
654#ifdef CONFIG_NET_DSA_TAG_EDSA
655 dev_remove_pack(&edsa_packet_type);
656#endif
657#ifdef CONFIG_NET_DSA_TAG_DSA
658 dev_remove_pack(&dsa_packet_type);
659#endif
660 platform_driver_unregister(&dsa_driver);
661}
662module_exit(dsa_cleanup_module);
663
664MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
665MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
666MODULE_LICENSE("GPL");
667MODULE_ALIAS("platform:dsa");
668
