GNU Linux-libre 4.14.266-gnu1
[releases.git] / net / dsa / legacy.c
1 /*
2  * net/dsa/legacy.c - Hardware switch handling
3  * Copyright (c) 2008-2009 Marvell Semiconductor
4  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11
12 #include <linux/device.h>
13 #include <linux/list.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_mdio.h>
19 #include <linux/of_platform.h>
20 #include <linux/of_net.h>
21 #include <linux/netdevice.h>
22 #include <linux/sysfs.h>
23 #include <linux/phy_fixed.h>
24 #include <linux/etherdevice.h>
25
26 #include "dsa_priv.h"
27
28 /* switch driver registration ***********************************************/
29 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
30 static LIST_HEAD(dsa_switch_drivers);
31
32 void register_switch_driver(struct dsa_switch_driver *drv)
33 {
34         mutex_lock(&dsa_switch_drivers_mutex);
35         list_add_tail(&drv->list, &dsa_switch_drivers);
36         mutex_unlock(&dsa_switch_drivers_mutex);
37 }
38 EXPORT_SYMBOL_GPL(register_switch_driver);
39
40 void unregister_switch_driver(struct dsa_switch_driver *drv)
41 {
42         mutex_lock(&dsa_switch_drivers_mutex);
43         list_del_init(&drv->list);
44         mutex_unlock(&dsa_switch_drivers_mutex);
45 }
46 EXPORT_SYMBOL_GPL(unregister_switch_driver);
47
48 static const struct dsa_switch_ops *
49 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
50                  const char **_name, void **priv)
51 {
52         const struct dsa_switch_ops *ret;
53         struct list_head *list;
54         const char *name;
55
56         ret = NULL;
57         name = NULL;
58
59         mutex_lock(&dsa_switch_drivers_mutex);
60         list_for_each(list, &dsa_switch_drivers) {
61                 const struct dsa_switch_ops *ops;
62                 struct dsa_switch_driver *drv;
63
64                 drv = list_entry(list, struct dsa_switch_driver, list);
65                 ops = drv->ops;
66
67                 name = ops->probe(parent, host_dev, sw_addr, priv);
68                 if (name != NULL) {
69                         ret = ops;
70                         break;
71                 }
72         }
73         mutex_unlock(&dsa_switch_drivers_mutex);
74
75         *_name = name;
76
77         return ret;
78 }
79
80 /* basic switch operations **************************************************/
81 static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
82 {
83         int ret, port;
84
85         for (port = 0; port < ds->num_ports; port++) {
86                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
87                         continue;
88
89                 ret = dsa_cpu_dsa_setup(&ds->ports[port]);
90                 if (ret)
91                         return ret;
92         }
93         return 0;
94 }
95
96 static int dsa_switch_setup_one(struct dsa_switch *ds,
97                                 struct net_device *master)
98 {
99         const struct dsa_switch_ops *ops = ds->ops;
100         struct dsa_switch_tree *dst = ds->dst;
101         struct dsa_chip_data *cd = ds->cd;
102         bool valid_name_found = false;
103         int index = ds->index;
104         int i, ret;
105
106         /*
107          * Validate supplied switch configuration.
108          */
109         for (i = 0; i < ds->num_ports; i++) {
110                 char *name;
111
112                 name = cd->port_names[i];
113                 if (name == NULL)
114                         continue;
115
116                 if (!strcmp(name, "cpu")) {
117                         if (dst->cpu_dp) {
118                                 netdev_err(master,
119                                            "multiple cpu ports?!\n");
120                                 return -EINVAL;
121                         }
122                         dst->cpu_dp = &ds->ports[i];
123                         dst->cpu_dp->netdev = master;
124                         ds->cpu_port_mask |= 1 << i;
125                 } else if (!strcmp(name, "dsa")) {
126                         ds->dsa_port_mask |= 1 << i;
127                 } else {
128                         ds->enabled_port_mask |= 1 << i;
129                 }
130                 valid_name_found = true;
131         }
132
133         if (!valid_name_found && i == ds->num_ports)
134                 return -EINVAL;
135
136         /* Make the built-in MII bus mask match the number of ports,
137          * switch drivers can override this later
138          */
139         ds->phys_mii_mask = ds->enabled_port_mask;
140
141         /*
142          * If the CPU connects to this switch, set the switch tree
143          * tagging protocol to the preferred tagging format of this
144          * switch.
145          */
146         if (dst->cpu_dp->ds == ds) {
147                 enum dsa_tag_protocol tag_protocol;
148
149                 tag_protocol = ops->get_tag_protocol(ds);
150                 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
151                 if (IS_ERR(dst->tag_ops))
152                         return PTR_ERR(dst->tag_ops);
153
154                 dst->rcv = dst->tag_ops->rcv;
155         }
156
157         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
158
159         /*
160          * Do basic register setup.
161          */
162         ret = ops->setup(ds);
163         if (ret < 0)
164                 return ret;
165
166         ret = dsa_switch_register_notifier(ds);
167         if (ret)
168                 return ret;
169
170         if (ops->set_addr) {
171                 ret = ops->set_addr(ds, master->dev_addr);
172                 if (ret < 0)
173                         return ret;
174         }
175
176         if (!ds->slave_mii_bus && ops->phy_read) {
177                 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
178                 if (!ds->slave_mii_bus)
179                         return -ENOMEM;
180                 dsa_slave_mii_bus_init(ds);
181
182                 ret = mdiobus_register(ds->slave_mii_bus);
183                 if (ret < 0)
184                         return ret;
185         }
186
187         /*
188          * Create network devices for physical switch ports.
189          */
190         for (i = 0; i < ds->num_ports; i++) {
191                 ds->ports[i].dn = cd->port_dn[i];
192                 ds->ports[i].cpu_dp = dst->cpu_dp;
193
194                 if (!(ds->enabled_port_mask & (1 << i)))
195                         continue;
196
197                 ret = dsa_slave_create(&ds->ports[i], cd->port_names[i]);
198                 if (ret < 0)
199                         netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
200                                    index, i, cd->port_names[i], ret);
201         }
202
203         /* Perform configuration of the CPU and DSA ports */
204         ret = dsa_cpu_dsa_setups(ds);
205         if (ret < 0)
206                 netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
207                            index);
208
209         ret = dsa_cpu_port_ethtool_setup(ds->dst->cpu_dp);
210         if (ret)
211                 return ret;
212
213         return 0;
214 }
215
216 static struct dsa_switch *
217 dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
218                  int index, struct device *parent, struct device *host_dev)
219 {
220         struct dsa_chip_data *cd = dst->pd->chip + index;
221         const struct dsa_switch_ops *ops;
222         struct dsa_switch *ds;
223         int ret;
224         const char *name;
225         void *priv;
226
227         /*
228          * Probe for switch model.
229          */
230         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
231         if (!ops) {
232                 netdev_err(master, "[%d]: could not detect attached switch\n",
233                            index);
234                 return ERR_PTR(-EINVAL);
235         }
236         netdev_info(master, "[%d]: detected a %s switch\n",
237                     index, name);
238
239
240         /*
241          * Allocate and initialise switch state.
242          */
243         ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
244         if (!ds)
245                 return ERR_PTR(-ENOMEM);
246
247         ds->dst = dst;
248         ds->index = index;
249         ds->cd = cd;
250         ds->ops = ops;
251         ds->priv = priv;
252
253         ret = dsa_switch_setup_one(ds, master);
254         if (ret)
255                 return ERR_PTR(ret);
256
257         return ds;
258 }
259
260 static void dsa_switch_destroy(struct dsa_switch *ds)
261 {
262         int port;
263
264         /* Destroy network devices for physical switch ports. */
265         for (port = 0; port < ds->num_ports; port++) {
266                 if (!(ds->enabled_port_mask & (1 << port)))
267                         continue;
268
269                 if (!ds->ports[port].netdev)
270                         continue;
271
272                 dsa_slave_destroy(ds->ports[port].netdev);
273         }
274
275         /* Disable configuration of the CPU and DSA ports */
276         for (port = 0; port < ds->num_ports; port++) {
277                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
278                         continue;
279                 dsa_cpu_dsa_destroy(&ds->ports[port]);
280
281                 /* Clearing a bit which is not set does no harm */
282                 ds->cpu_port_mask |= ~(1 << port);
283                 ds->dsa_port_mask |= ~(1 << port);
284         }
285
286         if (ds->slave_mii_bus && ds->ops->phy_read)
287                 mdiobus_unregister(ds->slave_mii_bus);
288
289         dsa_switch_unregister_notifier(ds);
290 }
291
292 /* platform driver init and cleanup *****************************************/
293 static int dev_is_class(struct device *dev, void *class)
294 {
295         if (dev->class != NULL && !strcmp(dev->class->name, class))
296                 return 1;
297
298         return 0;
299 }
300
301 static struct device *dev_find_class(struct device *parent, char *class)
302 {
303         if (dev_is_class(parent, class)) {
304                 get_device(parent);
305                 return parent;
306         }
307
308         return device_find_child(parent, class, dev_is_class);
309 }
310
311 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
312 {
313         struct device *d;
314
315         d = dev_find_class(dev, "mdio_bus");
316         if (d != NULL) {
317                 struct mii_bus *bus;
318
319                 bus = to_mii_bus(d);
320                 put_device(d);
321
322                 return bus;
323         }
324
325         return NULL;
326 }
327 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
328
329 #ifdef CONFIG_OF
330 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
331                                         struct dsa_chip_data *cd,
332                                         int chip_index, int port_index,
333                                         struct device_node *link)
334 {
335         const __be32 *reg;
336         int link_sw_addr;
337         struct device_node *parent_sw;
338         int len;
339
340         parent_sw = of_get_parent(link);
341         if (!parent_sw)
342                 return -EINVAL;
343
344         reg = of_get_property(parent_sw, "reg", &len);
345         if (!reg || (len != sizeof(*reg) * 2))
346                 return -EINVAL;
347
348         /*
349          * Get the destination switch number from the second field of its 'reg'
350          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
351          */
352         link_sw_addr = be32_to_cpup(reg + 1);
353
354         if (link_sw_addr >= pd->nr_chips)
355                 return -EINVAL;
356
357         cd->rtable[link_sw_addr] = port_index;
358
359         return 0;
360 }
361
362 static int dsa_of_probe_links(struct dsa_platform_data *pd,
363                               struct dsa_chip_data *cd,
364                               int chip_index, int port_index,
365                               struct device_node *port,
366                               const char *port_name)
367 {
368         struct device_node *link;
369         int link_index;
370         int ret;
371
372         for (link_index = 0;; link_index++) {
373                 link = of_parse_phandle(port, "link", link_index);
374                 if (!link)
375                         break;
376
377                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
378                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
379                                                          port_index, link);
380                         if (ret)
381                                 return ret;
382                 }
383         }
384         return 0;
385 }
386
387 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
388 {
389         int i;
390         int port_index;
391
392         for (i = 0; i < pd->nr_chips; i++) {
393                 port_index = 0;
394                 while (port_index < DSA_MAX_PORTS) {
395                         kfree(pd->chip[i].port_names[port_index]);
396                         port_index++;
397                 }
398
399                 /* Drop our reference to the MDIO bus device */
400                 if (pd->chip[i].host_dev)
401                         put_device(pd->chip[i].host_dev);
402         }
403         kfree(pd->chip);
404 }
405
406 static int dsa_of_probe(struct device *dev)
407 {
408         struct device_node *np = dev->of_node;
409         struct device_node *child, *mdio, *ethernet, *port;
410         struct mii_bus *mdio_bus, *mdio_bus_switch;
411         struct net_device *ethernet_dev;
412         struct dsa_platform_data *pd;
413         struct dsa_chip_data *cd;
414         const char *port_name;
415         int chip_index, port_index;
416         const unsigned int *sw_addr, *port_reg;
417         u32 eeprom_len;
418         int ret;
419
420         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
421         if (!mdio)
422                 return -EINVAL;
423
424         mdio_bus = of_mdio_find_bus(mdio);
425         if (!mdio_bus)
426                 return -EPROBE_DEFER;
427
428         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
429         if (!ethernet) {
430                 ret = -EINVAL;
431                 goto out_put_mdio;
432         }
433
434         ethernet_dev = of_find_net_device_by_node(ethernet);
435         if (!ethernet_dev) {
436                 ret = -EPROBE_DEFER;
437                 goto out_put_mdio;
438         }
439
440         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
441         if (!pd) {
442                 ret = -ENOMEM;
443                 goto out_put_ethernet;
444         }
445
446         dev->platform_data = pd;
447         pd->of_netdev = ethernet_dev;
448         pd->nr_chips = of_get_available_child_count(np);
449         if (pd->nr_chips > DSA_MAX_SWITCHES)
450                 pd->nr_chips = DSA_MAX_SWITCHES;
451
452         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
453                            GFP_KERNEL);
454         if (!pd->chip) {
455                 ret = -ENOMEM;
456                 goto out_free;
457         }
458
459         chip_index = -1;
460         for_each_available_child_of_node(np, child) {
461                 int i;
462
463                 chip_index++;
464                 cd = &pd->chip[chip_index];
465
466                 cd->of_node = child;
467
468                 /* Initialize the routing table */
469                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
470                         cd->rtable[i] = DSA_RTABLE_NONE;
471
472                 /* When assigning the host device, increment its refcount */
473                 cd->host_dev = get_device(&mdio_bus->dev);
474
475                 sw_addr = of_get_property(child, "reg", NULL);
476                 if (!sw_addr)
477                         continue;
478
479                 cd->sw_addr = be32_to_cpup(sw_addr);
480                 if (cd->sw_addr >= PHY_MAX_ADDR)
481                         continue;
482
483                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
484                         cd->eeprom_len = eeprom_len;
485
486                 mdio = of_parse_phandle(child, "mii-bus", 0);
487                 if (mdio) {
488                         mdio_bus_switch = of_mdio_find_bus(mdio);
489                         if (!mdio_bus_switch) {
490                                 ret = -EPROBE_DEFER;
491                                 goto out_free_chip;
492                         }
493
494                         /* Drop the mdio_bus device ref, replacing the host
495                          * device with the mdio_bus_switch device, keeping
496                          * the refcount from of_mdio_find_bus() above.
497                          */
498                         put_device(cd->host_dev);
499                         cd->host_dev = &mdio_bus_switch->dev;
500                 }
501
502                 for_each_available_child_of_node(child, port) {
503                         port_reg = of_get_property(port, "reg", NULL);
504                         if (!port_reg)
505                                 continue;
506
507                         port_index = be32_to_cpup(port_reg);
508                         if (port_index >= DSA_MAX_PORTS)
509                                 break;
510
511                         port_name = of_get_property(port, "label", NULL);
512                         if (!port_name)
513                                 continue;
514
515                         cd->port_dn[port_index] = port;
516
517                         cd->port_names[port_index] = kstrdup(port_name,
518                                         GFP_KERNEL);
519                         if (!cd->port_names[port_index]) {
520                                 ret = -ENOMEM;
521                                 goto out_free_chip;
522                         }
523
524                         ret = dsa_of_probe_links(pd, cd, chip_index,
525                                                  port_index, port, port_name);
526                         if (ret)
527                                 goto out_free_chip;
528
529                 }
530         }
531
532         /* The individual chips hold their own refcount on the mdio bus,
533          * so drop ours */
534         put_device(&mdio_bus->dev);
535
536         return 0;
537
538 out_free_chip:
539         dsa_of_free_platform_data(pd);
540 out_free:
541         kfree(pd);
542         dev->platform_data = NULL;
543 out_put_ethernet:
544         put_device(&ethernet_dev->dev);
545 out_put_mdio:
546         put_device(&mdio_bus->dev);
547         return ret;
548 }
549
550 static void dsa_of_remove(struct device *dev)
551 {
552         struct dsa_platform_data *pd = dev->platform_data;
553
554         if (!dev->of_node)
555                 return;
556
557         dsa_of_free_platform_data(pd);
558         put_device(&pd->of_netdev->dev);
559         kfree(pd);
560 }
561 #else
562 static inline int dsa_of_probe(struct device *dev)
563 {
564         return 0;
565 }
566
567 static inline void dsa_of_remove(struct device *dev)
568 {
569 }
570 #endif
571
572 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
573                          struct device *parent, struct dsa_platform_data *pd)
574 {
575         int i;
576         unsigned configured = 0;
577
578         dst->pd = pd;
579
580         for (i = 0; i < pd->nr_chips; i++) {
581                 struct dsa_switch *ds;
582
583                 ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
584                 if (IS_ERR(ds)) {
585                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
586                                    i, PTR_ERR(ds));
587                         continue;
588                 }
589
590                 dst->ds[i] = ds;
591
592                 ++configured;
593         }
594
595         /*
596          * If no switch was found, exit cleanly
597          */
598         if (!configured)
599                 return -EPROBE_DEFER;
600
601         /*
602          * If we use a tagging format that doesn't have an ethertype
603          * field, make sure that all packets from this point on get
604          * sent to the tag format's receive function.
605          */
606         wmb();
607         dev->dsa_ptr = dst;
608
609         return 0;
610 }
611
612 static int dsa_probe(struct platform_device *pdev)
613 {
614         struct dsa_platform_data *pd = pdev->dev.platform_data;
615         struct net_device *dev;
616         struct dsa_switch_tree *dst;
617         int ret;
618
619         if (pdev->dev.of_node) {
620                 ret = dsa_of_probe(&pdev->dev);
621                 if (ret)
622                         return ret;
623
624                 pd = pdev->dev.platform_data;
625         }
626
627         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
628                 return -EINVAL;
629
630         if (pd->of_netdev) {
631                 dev = pd->of_netdev;
632                 dev_hold(dev);
633         } else {
634                 dev = dsa_dev_to_net_device(pd->netdev);
635         }
636         if (dev == NULL) {
637                 ret = -EPROBE_DEFER;
638                 goto out;
639         }
640
641         if (dev->dsa_ptr != NULL) {
642                 dev_put(dev);
643                 ret = -EEXIST;
644                 goto out;
645         }
646
647         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
648         if (dst == NULL) {
649                 dev_put(dev);
650                 ret = -ENOMEM;
651                 goto out;
652         }
653
654         platform_set_drvdata(pdev, dst);
655
656         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
657         if (ret) {
658                 dev_put(dev);
659                 goto out;
660         }
661
662         return 0;
663
664 out:
665         dsa_of_remove(&pdev->dev);
666
667         return ret;
668 }
669
670 static void dsa_remove_dst(struct dsa_switch_tree *dst)
671 {
672         int i;
673
674         dst->cpu_dp->netdev->dsa_ptr = NULL;
675
676         /* If we used a tagging format that doesn't have an ethertype
677          * field, make sure that all packets from this point get sent
678          * without the tag and go through the regular receive path.
679          */
680         wmb();
681
682         for (i = 0; i < dst->pd->nr_chips; i++) {
683                 struct dsa_switch *ds = dst->ds[i];
684
685                 if (ds)
686                         dsa_switch_destroy(ds);
687         }
688
689         dsa_cpu_port_ethtool_restore(dst->cpu_dp);
690
691         dev_put(dst->cpu_dp->netdev);
692 }
693
694 static int dsa_remove(struct platform_device *pdev)
695 {
696         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
697
698         dsa_remove_dst(dst);
699         dsa_of_remove(&pdev->dev);
700
701         return 0;
702 }
703
704 static void dsa_shutdown(struct platform_device *pdev)
705 {
706 }
707
708 #ifdef CONFIG_PM_SLEEP
709 static int dsa_suspend(struct device *d)
710 {
711         struct platform_device *pdev = to_platform_device(d);
712         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
713         int i, ret = 0;
714
715         for (i = 0; i < dst->pd->nr_chips; i++) {
716                 struct dsa_switch *ds = dst->ds[i];
717
718                 if (ds != NULL)
719                         ret = dsa_switch_suspend(ds);
720         }
721
722         return ret;
723 }
724
725 static int dsa_resume(struct device *d)
726 {
727         struct platform_device *pdev = to_platform_device(d);
728         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
729         int i, ret = 0;
730
731         for (i = 0; i < dst->pd->nr_chips; i++) {
732                 struct dsa_switch *ds = dst->ds[i];
733
734                 if (ds != NULL)
735                         ret = dsa_switch_resume(ds);
736         }
737
738         return ret;
739 }
740 #endif
741
742 /* legacy way, bypassing the bridge *****************************************/
743 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
744                        struct net_device *dev,
745                        const unsigned char *addr, u16 vid,
746                        u16 flags)
747 {
748         struct dsa_slave_priv *p = netdev_priv(dev);
749         struct dsa_port *dp = p->dp;
750
751         return dsa_port_fdb_add(dp, addr, vid);
752 }
753
754 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
755                        struct net_device *dev,
756                        const unsigned char *addr, u16 vid)
757 {
758         struct dsa_slave_priv *p = netdev_priv(dev);
759         struct dsa_port *dp = p->dp;
760
761         return dsa_port_fdb_del(dp, addr, vid);
762 }
763
764 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
765
766 static const struct of_device_id dsa_of_match_table[] = {
767         { .compatible = "marvell,dsa", },
768         {}
769 };
770 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
771
772 static struct platform_driver dsa_driver = {
773         .probe          = dsa_probe,
774         .remove         = dsa_remove,
775         .shutdown       = dsa_shutdown,
776         .driver = {
777                 .name   = "dsa",
778                 .of_match_table = dsa_of_match_table,
779                 .pm     = &dsa_pm_ops,
780         },
781 };
782
783 int dsa_legacy_register(void)
784 {
785         return platform_driver_register(&dsa_driver);
786 }
787
788 void dsa_legacy_unregister(void)
789 {
790         platform_driver_unregister(&dsa_driver);
791 }