Merge branches 'arm/rockchip', 'arm/exynos', 'arm/smmu', 'x86/vt-d', 'x86/amd', ...
[sfrench/cifs-2.6.git] / net / dsa / dsa.c
1 /*
2  * net/dsa/dsa.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/ctype.h>
13 #include <linux/device.h>
14 #include <linux/hwmon.h>
15 #include <linux/list.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <net/dsa.h>
20 #include <linux/of.h>
21 #include <linux/of_mdio.h>
22 #include <linux/of_platform.h>
23 #include <linux/of_net.h>
24 #include <linux/sysfs.h>
25 #include "dsa_priv.h"
26
27 char dsa_driver_version[] = "0.1";
28
29
30 /* switch driver registration ***********************************************/
31 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
32 static LIST_HEAD(dsa_switch_drivers);
33
34 void register_switch_driver(struct dsa_switch_driver *drv)
35 {
36         mutex_lock(&dsa_switch_drivers_mutex);
37         list_add_tail(&drv->list, &dsa_switch_drivers);
38         mutex_unlock(&dsa_switch_drivers_mutex);
39 }
40 EXPORT_SYMBOL_GPL(register_switch_driver);
41
42 void unregister_switch_driver(struct dsa_switch_driver *drv)
43 {
44         mutex_lock(&dsa_switch_drivers_mutex);
45         list_del_init(&drv->list);
46         mutex_unlock(&dsa_switch_drivers_mutex);
47 }
48 EXPORT_SYMBOL_GPL(unregister_switch_driver);
49
50 static struct dsa_switch_driver *
51 dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
52 {
53         struct dsa_switch_driver *ret;
54         struct list_head *list;
55         char *name;
56
57         ret = NULL;
58         name = NULL;
59
60         mutex_lock(&dsa_switch_drivers_mutex);
61         list_for_each(list, &dsa_switch_drivers) {
62                 struct dsa_switch_driver *drv;
63
64                 drv = list_entry(list, struct dsa_switch_driver, list);
65
66                 name = drv->probe(host_dev, sw_addr);
67                 if (name != NULL) {
68                         ret = drv;
69                         break;
70                 }
71         }
72         mutex_unlock(&dsa_switch_drivers_mutex);
73
74         *_name = name;
75
76         return ret;
77 }
78
79 /* hwmon support ************************************************************/
80
81 #ifdef CONFIG_NET_DSA_HWMON
82
83 static ssize_t temp1_input_show(struct device *dev,
84                                 struct device_attribute *attr, char *buf)
85 {
86         struct dsa_switch *ds = dev_get_drvdata(dev);
87         int temp, ret;
88
89         ret = ds->drv->get_temp(ds, &temp);
90         if (ret < 0)
91                 return ret;
92
93         return sprintf(buf, "%d\n", temp * 1000);
94 }
95 static DEVICE_ATTR_RO(temp1_input);
96
97 static ssize_t temp1_max_show(struct device *dev,
98                               struct device_attribute *attr, char *buf)
99 {
100         struct dsa_switch *ds = dev_get_drvdata(dev);
101         int temp, ret;
102
103         ret = ds->drv->get_temp_limit(ds, &temp);
104         if (ret < 0)
105                 return ret;
106
107         return sprintf(buf, "%d\n", temp * 1000);
108 }
109
110 static ssize_t temp1_max_store(struct device *dev,
111                                struct device_attribute *attr, const char *buf,
112                                size_t count)
113 {
114         struct dsa_switch *ds = dev_get_drvdata(dev);
115         int temp, ret;
116
117         ret = kstrtoint(buf, 0, &temp);
118         if (ret < 0)
119                 return ret;
120
121         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
122         if (ret < 0)
123                 return ret;
124
125         return count;
126 }
127 static DEVICE_ATTR_RW(temp1_max);
128
129 static ssize_t temp1_max_alarm_show(struct device *dev,
130                                     struct device_attribute *attr, char *buf)
131 {
132         struct dsa_switch *ds = dev_get_drvdata(dev);
133         bool alarm;
134         int ret;
135
136         ret = ds->drv->get_temp_alarm(ds, &alarm);
137         if (ret < 0)
138                 return ret;
139
140         return sprintf(buf, "%d\n", alarm);
141 }
142 static DEVICE_ATTR_RO(temp1_max_alarm);
143
144 static struct attribute *dsa_hwmon_attrs[] = {
145         &dev_attr_temp1_input.attr,     /* 0 */
146         &dev_attr_temp1_max.attr,       /* 1 */
147         &dev_attr_temp1_max_alarm.attr, /* 2 */
148         NULL
149 };
150
151 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
152                                        struct attribute *attr, int index)
153 {
154         struct device *dev = container_of(kobj, struct device, kobj);
155         struct dsa_switch *ds = dev_get_drvdata(dev);
156         struct dsa_switch_driver *drv = ds->drv;
157         umode_t mode = attr->mode;
158
159         if (index == 1) {
160                 if (!drv->get_temp_limit)
161                         mode = 0;
162                 else if (!drv->set_temp_limit)
163                         mode &= ~S_IWUSR;
164         } else if (index == 2 && !drv->get_temp_alarm) {
165                 mode = 0;
166         }
167         return mode;
168 }
169
170 static const struct attribute_group dsa_hwmon_group = {
171         .attrs = dsa_hwmon_attrs,
172         .is_visible = dsa_hwmon_attrs_visible,
173 };
174 __ATTRIBUTE_GROUPS(dsa_hwmon);
175
176 #endif /* CONFIG_NET_DSA_HWMON */
177
178 /* basic switch operations **************************************************/
179 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
180 {
181         struct dsa_switch_driver *drv = ds->drv;
182         struct dsa_switch_tree *dst = ds->dst;
183         struct dsa_chip_data *pd = ds->pd;
184         bool valid_name_found = false;
185         int index = ds->index;
186         int i, ret;
187
188         /*
189          * Validate supplied switch configuration.
190          */
191         for (i = 0; i < DSA_MAX_PORTS; i++) {
192                 char *name;
193
194                 name = pd->port_names[i];
195                 if (name == NULL)
196                         continue;
197
198                 if (!strcmp(name, "cpu")) {
199                         if (dst->cpu_switch != -1) {
200                                 netdev_err(dst->master_netdev,
201                                            "multiple cpu ports?!\n");
202                                 ret = -EINVAL;
203                                 goto out;
204                         }
205                         dst->cpu_switch = index;
206                         dst->cpu_port = i;
207                 } else if (!strcmp(name, "dsa")) {
208                         ds->dsa_port_mask |= 1 << i;
209                 } else {
210                         ds->phys_port_mask |= 1 << i;
211                 }
212                 valid_name_found = true;
213         }
214
215         if (!valid_name_found && i == DSA_MAX_PORTS) {
216                 ret = -EINVAL;
217                 goto out;
218         }
219
220         /* Make the built-in MII bus mask match the number of ports,
221          * switch drivers can override this later
222          */
223         ds->phys_mii_mask = ds->phys_port_mask;
224
225         /*
226          * If the CPU connects to this switch, set the switch tree
227          * tagging protocol to the preferred tagging format of this
228          * switch.
229          */
230         if (dst->cpu_switch == index) {
231                 switch (ds->tag_protocol) {
232 #ifdef CONFIG_NET_DSA_TAG_DSA
233                 case DSA_TAG_PROTO_DSA:
234                         dst->rcv = dsa_netdev_ops.rcv;
235                         break;
236 #endif
237 #ifdef CONFIG_NET_DSA_TAG_EDSA
238                 case DSA_TAG_PROTO_EDSA:
239                         dst->rcv = edsa_netdev_ops.rcv;
240                         break;
241 #endif
242 #ifdef CONFIG_NET_DSA_TAG_TRAILER
243                 case DSA_TAG_PROTO_TRAILER:
244                         dst->rcv = trailer_netdev_ops.rcv;
245                         break;
246 #endif
247 #ifdef CONFIG_NET_DSA_TAG_BRCM
248                 case DSA_TAG_PROTO_BRCM:
249                         dst->rcv = brcm_netdev_ops.rcv;
250                         break;
251 #endif
252                 case DSA_TAG_PROTO_NONE:
253                         break;
254                 default:
255                         ret = -ENOPROTOOPT;
256                         goto out;
257                 }
258
259                 dst->tag_protocol = ds->tag_protocol;
260         }
261
262         /*
263          * Do basic register setup.
264          */
265         ret = drv->setup(ds);
266         if (ret < 0)
267                 goto out;
268
269         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
270         if (ret < 0)
271                 goto out;
272
273         ds->slave_mii_bus = mdiobus_alloc();
274         if (ds->slave_mii_bus == NULL) {
275                 ret = -ENOMEM;
276                 goto out;
277         }
278         dsa_slave_mii_bus_init(ds);
279
280         ret = mdiobus_register(ds->slave_mii_bus);
281         if (ret < 0)
282                 goto out_free;
283
284
285         /*
286          * Create network devices for physical switch ports.
287          */
288         for (i = 0; i < DSA_MAX_PORTS; i++) {
289                 if (!(ds->phys_port_mask & (1 << i)))
290                         continue;
291
292                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
293                 if (ret < 0) {
294                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
295                                    index, i, pd->port_names[i]);
296                         ret = 0;
297                 }
298         }
299
300 #ifdef CONFIG_NET_DSA_HWMON
301         /* If the switch provides a temperature sensor,
302          * register with hardware monitoring subsystem.
303          * Treat registration error as non-fatal and ignore it.
304          */
305         if (drv->get_temp) {
306                 const char *netname = netdev_name(dst->master_netdev);
307                 char hname[IFNAMSIZ + 1];
308                 int i, j;
309
310                 /* Create valid hwmon 'name' attribute */
311                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
312                         if (isalnum(netname[i]))
313                                 hname[j++] = netname[i];
314                 }
315                 hname[j] = '\0';
316                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
317                           hname, index);
318                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
319                                         ds->hwmon_name, ds, dsa_hwmon_groups);
320                 if (IS_ERR(ds->hwmon_dev))
321                         ds->hwmon_dev = NULL;
322         }
323 #endif /* CONFIG_NET_DSA_HWMON */
324
325         return ret;
326
327 out_free:
328         mdiobus_free(ds->slave_mii_bus);
329 out:
330         kfree(ds);
331         return ret;
332 }
333
334 static struct dsa_switch *
335 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
336                  struct device *parent, struct device *host_dev)
337 {
338         struct dsa_chip_data *pd = dst->pd->chip + index;
339         struct dsa_switch_driver *drv;
340         struct dsa_switch *ds;
341         int ret;
342         char *name;
343
344         /*
345          * Probe for switch model.
346          */
347         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
348         if (drv == NULL) {
349                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
350                            index);
351                 return ERR_PTR(-EINVAL);
352         }
353         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
354                     index, name);
355
356
357         /*
358          * Allocate and initialise switch state.
359          */
360         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
361         if (ds == NULL)
362                 return ERR_PTR(-ENOMEM);
363
364         ds->dst = dst;
365         ds->index = index;
366         ds->pd = pd;
367         ds->drv = drv;
368         ds->tag_protocol = drv->tag_protocol;
369         ds->master_dev = host_dev;
370
371         ret = dsa_switch_setup_one(ds, parent);
372         if (ret)
373                 return ERR_PTR(ret);
374
375         return ds;
376 }
377
378 static void dsa_switch_destroy(struct dsa_switch *ds)
379 {
380 #ifdef CONFIG_NET_DSA_HWMON
381         if (ds->hwmon_dev)
382                 hwmon_device_unregister(ds->hwmon_dev);
383 #endif
384 }
385
386 #ifdef CONFIG_PM_SLEEP
387 static int dsa_switch_suspend(struct dsa_switch *ds)
388 {
389         int i, ret = 0;
390
391         /* Suspend slave network devices */
392         for (i = 0; i < DSA_MAX_PORTS; i++) {
393                 if (!dsa_is_port_initialized(ds, i))
394                         continue;
395
396                 ret = dsa_slave_suspend(ds->ports[i]);
397                 if (ret)
398                         return ret;
399         }
400
401         if (ds->drv->suspend)
402                 ret = ds->drv->suspend(ds);
403
404         return ret;
405 }
406
407 static int dsa_switch_resume(struct dsa_switch *ds)
408 {
409         int i, ret = 0;
410
411         if (ds->drv->resume)
412                 ret = ds->drv->resume(ds);
413
414         if (ret)
415                 return ret;
416
417         /* Resume slave network devices */
418         for (i = 0; i < DSA_MAX_PORTS; i++) {
419                 if (!dsa_is_port_initialized(ds, i))
420                         continue;
421
422                 ret = dsa_slave_resume(ds->ports[i]);
423                 if (ret)
424                         return ret;
425         }
426
427         return 0;
428 }
429 #endif
430
431
432 /* link polling *************************************************************/
433 static void dsa_link_poll_work(struct work_struct *ugly)
434 {
435         struct dsa_switch_tree *dst;
436         int i;
437
438         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
439
440         for (i = 0; i < dst->pd->nr_chips; i++) {
441                 struct dsa_switch *ds = dst->ds[i];
442
443                 if (ds != NULL && ds->drv->poll_link != NULL)
444                         ds->drv->poll_link(ds);
445         }
446
447         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
448 }
449
450 static void dsa_link_poll_timer(unsigned long _dst)
451 {
452         struct dsa_switch_tree *dst = (void *)_dst;
453
454         schedule_work(&dst->link_poll_work);
455 }
456
457
458 /* platform driver init and cleanup *****************************************/
459 static int dev_is_class(struct device *dev, void *class)
460 {
461         if (dev->class != NULL && !strcmp(dev->class->name, class))
462                 return 1;
463
464         return 0;
465 }
466
467 static struct device *dev_find_class(struct device *parent, char *class)
468 {
469         if (dev_is_class(parent, class)) {
470                 get_device(parent);
471                 return parent;
472         }
473
474         return device_find_child(parent, class, dev_is_class);
475 }
476
477 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
478 {
479         struct device *d;
480
481         d = dev_find_class(dev, "mdio_bus");
482         if (d != NULL) {
483                 struct mii_bus *bus;
484
485                 bus = to_mii_bus(d);
486                 put_device(d);
487
488                 return bus;
489         }
490
491         return NULL;
492 }
493 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
494
495 static struct net_device *dev_to_net_device(struct device *dev)
496 {
497         struct device *d;
498
499         d = dev_find_class(dev, "net");
500         if (d != NULL) {
501                 struct net_device *nd;
502
503                 nd = to_net_dev(d);
504                 dev_hold(nd);
505                 put_device(d);
506
507                 return nd;
508         }
509
510         return NULL;
511 }
512
513 #ifdef CONFIG_OF
514 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
515                                         struct dsa_chip_data *cd,
516                                         int chip_index, int port_index,
517                                         struct device_node *link)
518 {
519         const __be32 *reg;
520         int link_sw_addr;
521         struct device_node *parent_sw;
522         int len;
523
524         parent_sw = of_get_parent(link);
525         if (!parent_sw)
526                 return -EINVAL;
527
528         reg = of_get_property(parent_sw, "reg", &len);
529         if (!reg || (len != sizeof(*reg) * 2))
530                 return -EINVAL;
531
532         /*
533          * Get the destination switch number from the second field of its 'reg'
534          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
535          */
536         link_sw_addr = be32_to_cpup(reg + 1);
537
538         if (link_sw_addr >= pd->nr_chips)
539                 return -EINVAL;
540
541         /* First time routing table allocation */
542         if (!cd->rtable) {
543                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
544                                            GFP_KERNEL);
545                 if (!cd->rtable)
546                         return -ENOMEM;
547
548                 /* default to no valid uplink/downlink */
549                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
550         }
551
552         cd->rtable[link_sw_addr] = port_index;
553
554         return 0;
555 }
556
557 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
558 {
559         int i;
560         int port_index;
561
562         for (i = 0; i < pd->nr_chips; i++) {
563                 port_index = 0;
564                 while (port_index < DSA_MAX_PORTS) {
565                         kfree(pd->chip[i].port_names[port_index]);
566                         port_index++;
567                 }
568                 kfree(pd->chip[i].rtable);
569         }
570         kfree(pd->chip);
571 }
572
573 static int dsa_of_probe(struct device *dev)
574 {
575         struct device_node *np = dev->of_node;
576         struct device_node *child, *mdio, *ethernet, *port, *link;
577         struct mii_bus *mdio_bus;
578         struct net_device *ethernet_dev;
579         struct dsa_platform_data *pd;
580         struct dsa_chip_data *cd;
581         const char *port_name;
582         int chip_index, port_index;
583         const unsigned int *sw_addr, *port_reg;
584         u32 eeprom_len;
585         int ret;
586
587         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
588         if (!mdio)
589                 return -EINVAL;
590
591         mdio_bus = of_mdio_find_bus(mdio);
592         if (!mdio_bus)
593                 return -EPROBE_DEFER;
594
595         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
596         if (!ethernet)
597                 return -EINVAL;
598
599         ethernet_dev = of_find_net_device_by_node(ethernet);
600         if (!ethernet_dev)
601                 return -EPROBE_DEFER;
602
603         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
604         if (!pd)
605                 return -ENOMEM;
606
607         dev->platform_data = pd;
608         pd->of_netdev = ethernet_dev;
609         pd->nr_chips = of_get_available_child_count(np);
610         if (pd->nr_chips > DSA_MAX_SWITCHES)
611                 pd->nr_chips = DSA_MAX_SWITCHES;
612
613         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
614                            GFP_KERNEL);
615         if (!pd->chip) {
616                 ret = -ENOMEM;
617                 goto out_free;
618         }
619
620         chip_index = -1;
621         for_each_available_child_of_node(np, child) {
622                 chip_index++;
623                 cd = &pd->chip[chip_index];
624
625                 cd->of_node = child;
626                 cd->host_dev = &mdio_bus->dev;
627
628                 sw_addr = of_get_property(child, "reg", NULL);
629                 if (!sw_addr)
630                         continue;
631
632                 cd->sw_addr = be32_to_cpup(sw_addr);
633                 if (cd->sw_addr > PHY_MAX_ADDR)
634                         continue;
635
636                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
637                         cd->eeprom_len = eeprom_len;
638
639                 for_each_available_child_of_node(child, port) {
640                         port_reg = of_get_property(port, "reg", NULL);
641                         if (!port_reg)
642                                 continue;
643
644                         port_index = be32_to_cpup(port_reg);
645
646                         port_name = of_get_property(port, "label", NULL);
647                         if (!port_name)
648                                 continue;
649
650                         cd->port_dn[port_index] = port;
651
652                         cd->port_names[port_index] = kstrdup(port_name,
653                                         GFP_KERNEL);
654                         if (!cd->port_names[port_index]) {
655                                 ret = -ENOMEM;
656                                 goto out_free_chip;
657                         }
658
659                         link = of_parse_phandle(port, "link", 0);
660
661                         if (!strcmp(port_name, "dsa") && link &&
662                                         pd->nr_chips > 1) {
663                                 ret = dsa_of_setup_routing_table(pd, cd,
664                                                 chip_index, port_index, link);
665                                 if (ret)
666                                         goto out_free_chip;
667                         }
668
669                         if (port_index == DSA_MAX_PORTS)
670                                 break;
671                 }
672         }
673
674         return 0;
675
676 out_free_chip:
677         dsa_of_free_platform_data(pd);
678 out_free:
679         kfree(pd);
680         dev->platform_data = NULL;
681         return ret;
682 }
683
684 static void dsa_of_remove(struct device *dev)
685 {
686         struct dsa_platform_data *pd = dev->platform_data;
687
688         if (!dev->of_node)
689                 return;
690
691         dsa_of_free_platform_data(pd);
692         kfree(pd);
693 }
694 #else
695 static inline int dsa_of_probe(struct device *dev)
696 {
697         return 0;
698 }
699
700 static inline void dsa_of_remove(struct device *dev)
701 {
702 }
703 #endif
704
705 static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
706                           struct device *parent, struct dsa_platform_data *pd)
707 {
708         int i;
709
710         dst->pd = pd;
711         dst->master_netdev = dev;
712         dst->cpu_switch = -1;
713         dst->cpu_port = -1;
714
715         for (i = 0; i < pd->nr_chips; i++) {
716                 struct dsa_switch *ds;
717
718                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
719                 if (IS_ERR(ds)) {
720                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
721                                    i, PTR_ERR(ds));
722                         continue;
723                 }
724
725                 dst->ds[i] = ds;
726                 if (ds->drv->poll_link != NULL)
727                         dst->link_poll_needed = 1;
728         }
729
730         /*
731          * If we use a tagging format that doesn't have an ethertype
732          * field, make sure that all packets from this point on get
733          * sent to the tag format's receive function.
734          */
735         wmb();
736         dev->dsa_ptr = (void *)dst;
737
738         if (dst->link_poll_needed) {
739                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
740                 init_timer(&dst->link_poll_timer);
741                 dst->link_poll_timer.data = (unsigned long)dst;
742                 dst->link_poll_timer.function = dsa_link_poll_timer;
743                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
744                 add_timer(&dst->link_poll_timer);
745         }
746 }
747
748 static int dsa_probe(struct platform_device *pdev)
749 {
750         struct dsa_platform_data *pd = pdev->dev.platform_data;
751         struct net_device *dev;
752         struct dsa_switch_tree *dst;
753         int ret;
754
755         pr_notice_once("Distributed Switch Architecture driver version %s\n",
756                        dsa_driver_version);
757
758         if (pdev->dev.of_node) {
759                 ret = dsa_of_probe(&pdev->dev);
760                 if (ret)
761                         return ret;
762
763                 pd = pdev->dev.platform_data;
764         }
765
766         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
767                 return -EINVAL;
768
769         if (pd->of_netdev) {
770                 dev = pd->of_netdev;
771                 dev_hold(dev);
772         } else {
773                 dev = dev_to_net_device(pd->netdev);
774         }
775         if (dev == NULL) {
776                 ret = -EPROBE_DEFER;
777                 goto out;
778         }
779
780         if (dev->dsa_ptr != NULL) {
781                 dev_put(dev);
782                 ret = -EEXIST;
783                 goto out;
784         }
785
786         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
787         if (dst == NULL) {
788                 dev_put(dev);
789                 ret = -ENOMEM;
790                 goto out;
791         }
792
793         platform_set_drvdata(pdev, dst);
794
795         dsa_setup_dst(dst, dev, &pdev->dev, pd);
796
797         return 0;
798
799 out:
800         dsa_of_remove(&pdev->dev);
801
802         return ret;
803 }
804
805 static void dsa_remove_dst(struct dsa_switch_tree *dst)
806 {
807         int i;
808
809         if (dst->link_poll_needed)
810                 del_timer_sync(&dst->link_poll_timer);
811
812         flush_work(&dst->link_poll_work);
813
814         for (i = 0; i < dst->pd->nr_chips; i++) {
815                 struct dsa_switch *ds = dst->ds[i];
816
817                 if (ds != NULL)
818                         dsa_switch_destroy(ds);
819         }
820 }
821
822 static int dsa_remove(struct platform_device *pdev)
823 {
824         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
825
826         dsa_remove_dst(dst);
827         dsa_of_remove(&pdev->dev);
828
829         return 0;
830 }
831
832 static void dsa_shutdown(struct platform_device *pdev)
833 {
834 }
835
836 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
837                           struct packet_type *pt, struct net_device *orig_dev)
838 {
839         struct dsa_switch_tree *dst = dev->dsa_ptr;
840
841         if (unlikely(dst == NULL)) {
842                 kfree_skb(skb);
843                 return 0;
844         }
845
846         return dst->rcv(skb, dev, pt, orig_dev);
847 }
848
849 static struct packet_type dsa_pack_type __read_mostly = {
850         .type   = cpu_to_be16(ETH_P_XDSA),
851         .func   = dsa_switch_rcv,
852 };
853
854 static struct notifier_block dsa_netdevice_nb __read_mostly = {
855         .notifier_call  = dsa_slave_netdevice_event,
856 };
857
858 #ifdef CONFIG_PM_SLEEP
859 static int dsa_suspend(struct device *d)
860 {
861         struct platform_device *pdev = to_platform_device(d);
862         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
863         int i, ret = 0;
864
865         for (i = 0; i < dst->pd->nr_chips; i++) {
866                 struct dsa_switch *ds = dst->ds[i];
867
868                 if (ds != NULL)
869                         ret = dsa_switch_suspend(ds);
870         }
871
872         return ret;
873 }
874
875 static int dsa_resume(struct device *d)
876 {
877         struct platform_device *pdev = to_platform_device(d);
878         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
879         int i, ret = 0;
880
881         for (i = 0; i < dst->pd->nr_chips; i++) {
882                 struct dsa_switch *ds = dst->ds[i];
883
884                 if (ds != NULL)
885                         ret = dsa_switch_resume(ds);
886         }
887
888         return ret;
889 }
890 #endif
891
892 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
893
894 static const struct of_device_id dsa_of_match_table[] = {
895         { .compatible = "brcm,bcm7445-switch-v4.0" },
896         { .compatible = "marvell,dsa", },
897         {}
898 };
899 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
900
901 static struct platform_driver dsa_driver = {
902         .probe          = dsa_probe,
903         .remove         = dsa_remove,
904         .shutdown       = dsa_shutdown,
905         .driver = {
906                 .name   = "dsa",
907                 .of_match_table = dsa_of_match_table,
908                 .pm     = &dsa_pm_ops,
909         },
910 };
911
912 static int __init dsa_init_module(void)
913 {
914         int rc;
915
916         register_netdevice_notifier(&dsa_netdevice_nb);
917
918         rc = platform_driver_register(&dsa_driver);
919         if (rc)
920                 return rc;
921
922         dev_add_pack(&dsa_pack_type);
923
924         return 0;
925 }
926 module_init(dsa_init_module);
927
928 static void __exit dsa_cleanup_module(void)
929 {
930         unregister_netdevice_notifier(&dsa_netdevice_nb);
931         dev_remove_pack(&dsa_pack_type);
932         platform_driver_unregister(&dsa_driver);
933 }
934 module_exit(dsa_cleanup_module);
935
936 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
937 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
938 MODULE_LICENSE("GPL");
939 MODULE_ALIAS("platform:dsa");