Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/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 <linux/phy_fixed.h>
 26 #include "dsa_priv.h"
 27 
 28 char dsa_driver_version[] = "0.1";
 29 
 30 
 31 /* switch driver registration ***********************************************/
 32 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
 33 static LIST_HEAD(dsa_switch_drivers);
 34 
 35 void register_switch_driver(struct dsa_switch_driver *drv)
 36 {
 37         mutex_lock(&dsa_switch_drivers_mutex);
 38         list_add_tail(&drv->list, &dsa_switch_drivers);
 39         mutex_unlock(&dsa_switch_drivers_mutex);
 40 }
 41 EXPORT_SYMBOL_GPL(register_switch_driver);
 42 
 43 void unregister_switch_driver(struct dsa_switch_driver *drv)
 44 {
 45         mutex_lock(&dsa_switch_drivers_mutex);
 46         list_del_init(&drv->list);
 47         mutex_unlock(&dsa_switch_drivers_mutex);
 48 }
 49 EXPORT_SYMBOL_GPL(unregister_switch_driver);
 50 
 51 static struct dsa_switch_driver *
 52 dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
 53 {
 54         struct dsa_switch_driver *ret;
 55         struct list_head *list;
 56         char *name;
 57 
 58         ret = NULL;
 59         name = NULL;
 60 
 61         mutex_lock(&dsa_switch_drivers_mutex);
 62         list_for_each(list, &dsa_switch_drivers) {
 63                 struct dsa_switch_driver *drv;
 64 
 65                 drv = list_entry(list, struct dsa_switch_driver, list);
 66 
 67                 name = drv->probe(host_dev, sw_addr);
 68                 if (name != NULL) {
 69                         ret = drv;
 70                         break;
 71                 }
 72         }
 73         mutex_unlock(&dsa_switch_drivers_mutex);
 74 
 75         *_name = name;
 76 
 77         return ret;
 78 }
 79 
 80 /* hwmon support ************************************************************/
 81 
 82 #ifdef CONFIG_NET_DSA_HWMON
 83 
 84 static ssize_t temp1_input_show(struct device *dev,
 85                                 struct device_attribute *attr, char *buf)
 86 {
 87         struct dsa_switch *ds = dev_get_drvdata(dev);
 88         int temp, ret;
 89 
 90         ret = ds->drv->get_temp(ds, &temp);
 91         if (ret < 0)
 92                 return ret;
 93 
 94         return sprintf(buf, "%d\n", temp * 1000);
 95 }
 96 static DEVICE_ATTR_RO(temp1_input);
 97 
 98 static ssize_t temp1_max_show(struct device *dev,
 99                               struct device_attribute *attr, char *buf)
100 {
101         struct dsa_switch *ds = dev_get_drvdata(dev);
102         int temp, ret;
103 
104         ret = ds->drv->get_temp_limit(ds, &temp);
105         if (ret < 0)
106                 return ret;
107 
108         return sprintf(buf, "%d\n", temp * 1000);
109 }
110 
111 static ssize_t temp1_max_store(struct device *dev,
112                                struct device_attribute *attr, const char *buf,
113                                size_t count)
114 {
115         struct dsa_switch *ds = dev_get_drvdata(dev);
116         int temp, ret;
117 
118         ret = kstrtoint(buf, 0, &temp);
119         if (ret < 0)
120                 return ret;
121 
122         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
123         if (ret < 0)
124                 return ret;
125 
126         return count;
127 }
128 static DEVICE_ATTR_RW(temp1_max);
129 
130 static ssize_t temp1_max_alarm_show(struct device *dev,
131                                     struct device_attribute *attr, char *buf)
132 {
133         struct dsa_switch *ds = dev_get_drvdata(dev);
134         bool alarm;
135         int ret;
136 
137         ret = ds->drv->get_temp_alarm(ds, &alarm);
138         if (ret < 0)
139                 return ret;
140 
141         return sprintf(buf, "%d\n", alarm);
142 }
143 static DEVICE_ATTR_RO(temp1_max_alarm);
144 
145 static struct attribute *dsa_hwmon_attrs[] = {
146         &dev_attr_temp1_input.attr,     /* 0 */
147         &dev_attr_temp1_max.attr,       /* 1 */
148         &dev_attr_temp1_max_alarm.attr, /* 2 */
149         NULL
150 };
151 
152 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
153                                        struct attribute *attr, int index)
154 {
155         struct device *dev = container_of(kobj, struct device, kobj);
156         struct dsa_switch *ds = dev_get_drvdata(dev);
157         struct dsa_switch_driver *drv = ds->drv;
158         umode_t mode = attr->mode;
159 
160         if (index == 1) {
161                 if (!drv->get_temp_limit)
162                         mode = 0;
163                 else if (!drv->set_temp_limit)
164                         mode &= ~S_IWUSR;
165         } else if (index == 2 && !drv->get_temp_alarm) {
166                 mode = 0;
167         }
168         return mode;
169 }
170 
171 static const struct attribute_group dsa_hwmon_group = {
172         .attrs = dsa_hwmon_attrs,
173         .is_visible = dsa_hwmon_attrs_visible,
174 };
175 __ATTRIBUTE_GROUPS(dsa_hwmon);
176 
177 #endif /* CONFIG_NET_DSA_HWMON */
178 
179 /* basic switch operations **************************************************/
180 static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
181 {
182         struct dsa_chip_data *cd = ds->pd;
183         struct device_node *port_dn;
184         struct phy_device *phydev;
185         int ret, port, mode;
186 
187         for (port = 0; port < DSA_MAX_PORTS; port++) {
188                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
189                         continue;
190 
191                 port_dn = cd->port_dn[port];
192                 if (of_phy_is_fixed_link(port_dn)) {
193                         ret = of_phy_register_fixed_link(port_dn);
194                         if (ret) {
195                                 netdev_err(master,
196                                            "failed to register fixed PHY\n");
197                                 return ret;
198                         }
199                         phydev = of_phy_find_device(port_dn);
200 
201                         mode = of_get_phy_mode(port_dn);
202                         if (mode < 0)
203                                 mode = PHY_INTERFACE_MODE_NA;
204                         phydev->interface = mode;
205 
206                         genphy_config_init(phydev);
207                         genphy_read_status(phydev);
208                         if (ds->drv->adjust_link)
209                                 ds->drv->adjust_link(ds, port, phydev);
210                 }
211         }
212         return 0;
213 }
214 
215 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
216 {
217         struct dsa_switch_driver *drv = ds->drv;
218         struct dsa_switch_tree *dst = ds->dst;
219         struct dsa_chip_data *pd = ds->pd;
220         bool valid_name_found = false;
221         int index = ds->index;
222         int i, ret;
223 
224         /*
225          * Validate supplied switch configuration.
226          */
227         for (i = 0; i < DSA_MAX_PORTS; i++) {
228                 char *name;
229 
230                 name = pd->port_names[i];
231                 if (name == NULL)
232                         continue;
233 
234                 if (!strcmp(name, "cpu")) {
235                         if (dst->cpu_switch != -1) {
236                                 netdev_err(dst->master_netdev,
237                                            "multiple cpu ports?!\n");
238                                 ret = -EINVAL;
239                                 goto out;
240                         }
241                         dst->cpu_switch = index;
242                         dst->cpu_port = i;
243                 } else if (!strcmp(name, "dsa")) {
244                         ds->dsa_port_mask |= 1 << i;
245                 } else {
246                         ds->phys_port_mask |= 1 << i;
247                 }
248                 valid_name_found = true;
249         }
250 
251         if (!valid_name_found && i == DSA_MAX_PORTS) {
252                 ret = -EINVAL;
253                 goto out;
254         }
255 
256         /* Make the built-in MII bus mask match the number of ports,
257          * switch drivers can override this later
258          */
259         ds->phys_mii_mask = ds->phys_port_mask;
260 
261         /*
262          * If the CPU connects to this switch, set the switch tree
263          * tagging protocol to the preferred tagging format of this
264          * switch.
265          */
266         if (dst->cpu_switch == index) {
267                 switch (ds->tag_protocol) {
268 #ifdef CONFIG_NET_DSA_TAG_DSA
269                 case DSA_TAG_PROTO_DSA:
270                         dst->rcv = dsa_netdev_ops.rcv;
271                         break;
272 #endif
273 #ifdef CONFIG_NET_DSA_TAG_EDSA
274                 case DSA_TAG_PROTO_EDSA:
275                         dst->rcv = edsa_netdev_ops.rcv;
276                         break;
277 #endif
278 #ifdef CONFIG_NET_DSA_TAG_TRAILER
279                 case DSA_TAG_PROTO_TRAILER:
280                         dst->rcv = trailer_netdev_ops.rcv;
281                         break;
282 #endif
283 #ifdef CONFIG_NET_DSA_TAG_BRCM
284                 case DSA_TAG_PROTO_BRCM:
285                         dst->rcv = brcm_netdev_ops.rcv;
286                         break;
287 #endif
288                 case DSA_TAG_PROTO_NONE:
289                         break;
290                 default:
291                         ret = -ENOPROTOOPT;
292                         goto out;
293                 }
294 
295                 dst->tag_protocol = ds->tag_protocol;
296         }
297 
298         /*
299          * Do basic register setup.
300          */
301         ret = drv->setup(ds);
302         if (ret < 0)
303                 goto out;
304 
305         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
306         if (ret < 0)
307                 goto out;
308 
309         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
310         if (ds->slave_mii_bus == NULL) {
311                 ret = -ENOMEM;
312                 goto out;
313         }
314         dsa_slave_mii_bus_init(ds);
315 
316         ret = mdiobus_register(ds->slave_mii_bus);
317         if (ret < 0)
318                 goto out;
319 
320 
321         /*
322          * Create network devices for physical switch ports.
323          */
324         for (i = 0; i < DSA_MAX_PORTS; i++) {
325                 if (!(ds->phys_port_mask & (1 << i)))
326                         continue;
327 
328                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
329                 if (ret < 0) {
330                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
331                                    index, i, pd->port_names[i], ret);
332                         ret = 0;
333                 }
334         }
335 
336         /* Perform configuration of the CPU and DSA ports */
337         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
338         if (ret < 0) {
339                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
340                            index);
341                 ret = 0;
342         }
343 
344 #ifdef CONFIG_NET_DSA_HWMON
345         /* If the switch provides a temperature sensor,
346          * register with hardware monitoring subsystem.
347          * Treat registration error as non-fatal and ignore it.
348          */
349         if (drv->get_temp) {
350                 const char *netname = netdev_name(dst->master_netdev);
351                 char hname[IFNAMSIZ + 1];
352                 int i, j;
353 
354                 /* Create valid hwmon 'name' attribute */
355                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
356                         if (isalnum(netname[i]))
357                                 hname[j++] = netname[i];
358                 }
359                 hname[j] = '\0';
360                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
361                           hname, index);
362                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
363                                         ds->hwmon_name, ds, dsa_hwmon_groups);
364                 if (IS_ERR(ds->hwmon_dev))
365                         ds->hwmon_dev = NULL;
366         }
367 #endif /* CONFIG_NET_DSA_HWMON */
368 
369         return ret;
370 
371 out:
372         return ret;
373 }
374 
375 static struct dsa_switch *
376 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
377                  struct device *parent, struct device *host_dev)
378 {
379         struct dsa_chip_data *pd = dst->pd->chip + index;
380         struct dsa_switch_driver *drv;
381         struct dsa_switch *ds;
382         int ret;
383         char *name;
384 
385         /*
386          * Probe for switch model.
387          */
388         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
389         if (drv == NULL) {
390                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
391                            index);
392                 return ERR_PTR(-EINVAL);
393         }
394         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
395                     index, name);
396 
397 
398         /*
399          * Allocate and initialise switch state.
400          */
401         ds = devm_kzalloc(parent, sizeof(*ds) + drv->priv_size, GFP_KERNEL);
402         if (ds == NULL)
403                 return ERR_PTR(-ENOMEM);
404 
405         ds->dst = dst;
406         ds->index = index;
407         ds->pd = pd;
408         ds->drv = drv;
409         ds->tag_protocol = drv->tag_protocol;
410         ds->master_dev = host_dev;
411 
412         ret = dsa_switch_setup_one(ds, parent);
413         if (ret)
414                 return ERR_PTR(ret);
415 
416         return ds;
417 }
418 
419 static void dsa_switch_destroy(struct dsa_switch *ds)
420 {
421         struct device_node *port_dn;
422         struct phy_device *phydev;
423         struct dsa_chip_data *cd = ds->pd;
424         int port;
425 
426 #ifdef CONFIG_NET_DSA_HWMON
427         if (ds->hwmon_dev)
428                 hwmon_device_unregister(ds->hwmon_dev);
429 #endif
430 
431         /* Disable configuration of the CPU and DSA ports */
432         for (port = 0; port < DSA_MAX_PORTS; port++) {
433                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
434                         continue;
435 
436                 port_dn = cd->port_dn[port];
437                 if (of_phy_is_fixed_link(port_dn)) {
438                         phydev = of_phy_find_device(port_dn);
439                         if (phydev) {
440                                 int addr = phydev->addr;
441 
442                                 phy_device_free(phydev);
443                                 of_node_put(port_dn);
444                                 fixed_phy_del(addr);
445                         }
446                 }
447         }
448 
449         /* Destroy network devices for physical switch ports. */
450         for (port = 0; port < DSA_MAX_PORTS; port++) {
451                 if (!(ds->phys_port_mask & (1 << port)))
452                         continue;
453 
454                 if (!ds->ports[port])
455                         continue;
456 
457                 unregister_netdev(ds->ports[port]);
458                 free_netdev(ds->ports[port]);
459         }
460 
461         mdiobus_unregister(ds->slave_mii_bus);
462 }
463 
464 #ifdef CONFIG_PM_SLEEP
465 static int dsa_switch_suspend(struct dsa_switch *ds)
466 {
467         int i, ret = 0;
468 
469         /* Suspend slave network devices */
470         for (i = 0; i < DSA_MAX_PORTS; i++) {
471                 if (!dsa_is_port_initialized(ds, i))
472                         continue;
473 
474                 ret = dsa_slave_suspend(ds->ports[i]);
475                 if (ret)
476                         return ret;
477         }
478 
479         if (ds->drv->suspend)
480                 ret = ds->drv->suspend(ds);
481 
482         return ret;
483 }
484 
485 static int dsa_switch_resume(struct dsa_switch *ds)
486 {
487         int i, ret = 0;
488 
489         if (ds->drv->resume)
490                 ret = ds->drv->resume(ds);
491 
492         if (ret)
493                 return ret;
494 
495         /* Resume slave network devices */
496         for (i = 0; i < DSA_MAX_PORTS; i++) {
497                 if (!dsa_is_port_initialized(ds, i))
498                         continue;
499 
500                 ret = dsa_slave_resume(ds->ports[i]);
501                 if (ret)
502                         return ret;
503         }
504 
505         return 0;
506 }
507 #endif
508 
509 
510 /* link polling *************************************************************/
511 static void dsa_link_poll_work(struct work_struct *ugly)
512 {
513         struct dsa_switch_tree *dst;
514         int i;
515 
516         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
517 
518         for (i = 0; i < dst->pd->nr_chips; i++) {
519                 struct dsa_switch *ds = dst->ds[i];
520 
521                 if (ds != NULL && ds->drv->poll_link != NULL)
522                         ds->drv->poll_link(ds);
523         }
524 
525         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
526 }
527 
528 static void dsa_link_poll_timer(unsigned long _dst)
529 {
530         struct dsa_switch_tree *dst = (void *)_dst;
531 
532         schedule_work(&dst->link_poll_work);
533 }
534 
535 
536 /* platform driver init and cleanup *****************************************/
537 static int dev_is_class(struct device *dev, void *class)
538 {
539         if (dev->class != NULL && !strcmp(dev->class->name, class))
540                 return 1;
541 
542         return 0;
543 }
544 
545 static struct device *dev_find_class(struct device *parent, char *class)
546 {
547         if (dev_is_class(parent, class)) {
548                 get_device(parent);
549                 return parent;
550         }
551 
552         return device_find_child(parent, class, dev_is_class);
553 }
554 
555 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
556 {
557         struct device *d;
558 
559         d = dev_find_class(dev, "mdio_bus");
560         if (d != NULL) {
561                 struct mii_bus *bus;
562 
563                 bus = to_mii_bus(d);
564                 put_device(d);
565 
566                 return bus;
567         }
568 
569         return NULL;
570 }
571 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
572 
573 static struct net_device *dev_to_net_device(struct device *dev)
574 {
575         struct device *d;
576 
577         d = dev_find_class(dev, "net");
578         if (d != NULL) {
579                 struct net_device *nd;
580 
581                 nd = to_net_dev(d);
582                 dev_hold(nd);
583                 put_device(d);
584 
585                 return nd;
586         }
587 
588         return NULL;
589 }
590 
591 #ifdef CONFIG_OF
592 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
593                                         struct dsa_chip_data *cd,
594                                         int chip_index, int port_index,
595                                         struct device_node *link)
596 {
597         const __be32 *reg;
598         int link_sw_addr;
599         struct device_node *parent_sw;
600         int len;
601 
602         parent_sw = of_get_parent(link);
603         if (!parent_sw)
604                 return -EINVAL;
605 
606         reg = of_get_property(parent_sw, "reg", &len);
607         if (!reg || (len != sizeof(*reg) * 2))
608                 return -EINVAL;
609 
610         /*
611          * Get the destination switch number from the second field of its 'reg'
612          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
613          */
614         link_sw_addr = be32_to_cpup(reg + 1);
615 
616         if (link_sw_addr >= pd->nr_chips)
617                 return -EINVAL;
618 
619         /* First time routing table allocation */
620         if (!cd->rtable) {
621                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
622                                            GFP_KERNEL);
623                 if (!cd->rtable)
624                         return -ENOMEM;
625 
626                 /* default to no valid uplink/downlink */
627                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
628         }
629 
630         cd->rtable[link_sw_addr] = port_index;
631 
632         return 0;
633 }
634 
635 static int dsa_of_probe_links(struct dsa_platform_data *pd,
636                               struct dsa_chip_data *cd,
637                               int chip_index, int port_index,
638                               struct device_node *port,
639                               const char *port_name)
640 {
641         struct device_node *link;
642         int link_index;
643         int ret;
644 
645         for (link_index = 0;; link_index++) {
646                 link = of_parse_phandle(port, "link", link_index);
647                 if (!link)
648                         break;
649 
650                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
651                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
652                                                          port_index, link);
653                         if (ret)
654                                 return ret;
655                 }
656         }
657         return 0;
658 }
659 
660 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
661 {
662         int i;
663         int port_index;
664 
665         for (i = 0; i < pd->nr_chips; i++) {
666                 port_index = 0;
667                 while (port_index < DSA_MAX_PORTS) {
668                         kfree(pd->chip[i].port_names[port_index]);
669                         port_index++;
670                 }
671                 kfree(pd->chip[i].rtable);
672 
673                 /* Drop our reference to the MDIO bus device */
674                 if (pd->chip[i].host_dev)
675                         put_device(pd->chip[i].host_dev);
676         }
677         kfree(pd->chip);
678 }
679 
680 static int dsa_of_probe(struct device *dev)
681 {
682         struct device_node *np = dev->of_node;
683         struct device_node *child, *mdio, *ethernet, *port;
684         struct mii_bus *mdio_bus, *mdio_bus_switch;
685         struct net_device *ethernet_dev;
686         struct dsa_platform_data *pd;
687         struct dsa_chip_data *cd;
688         const char *port_name;
689         int chip_index, port_index;
690         const unsigned int *sw_addr, *port_reg;
691         u32 eeprom_len;
692         int ret;
693 
694         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
695         if (!mdio)
696                 return -EINVAL;
697 
698         mdio_bus = of_mdio_find_bus(mdio);
699         if (!mdio_bus)
700                 return -EPROBE_DEFER;
701 
702         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
703         if (!ethernet) {
704                 ret = -EINVAL;
705                 goto out_put_mdio;
706         }
707 
708         ethernet_dev = of_find_net_device_by_node(ethernet);
709         if (!ethernet_dev) {
710                 ret = -EPROBE_DEFER;
711                 goto out_put_mdio;
712         }
713 
714         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
715         if (!pd) {
716                 ret = -ENOMEM;
717                 goto out_put_ethernet;
718         }
719 
720         dev->platform_data = pd;
721         pd->of_netdev = ethernet_dev;
722         pd->nr_chips = of_get_available_child_count(np);
723         if (pd->nr_chips > DSA_MAX_SWITCHES)
724                 pd->nr_chips = DSA_MAX_SWITCHES;
725 
726         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
727                            GFP_KERNEL);
728         if (!pd->chip) {
729                 ret = -ENOMEM;
730                 goto out_free;
731         }
732 
733         chip_index = -1;
734         for_each_available_child_of_node(np, child) {
735                 chip_index++;
736                 cd = &pd->chip[chip_index];
737 
738                 cd->of_node = child;
739 
740                 /* When assigning the host device, increment its refcount */
741                 cd->host_dev = get_device(&mdio_bus->dev);
742 
743                 sw_addr = of_get_property(child, "reg", NULL);
744                 if (!sw_addr)
745                         continue;
746 
747                 cd->sw_addr = be32_to_cpup(sw_addr);
748                 if (cd->sw_addr >= PHY_MAX_ADDR)
749                         continue;
750 
751                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
752                         cd->eeprom_len = eeprom_len;
753 
754                 mdio = of_parse_phandle(child, "mii-bus", 0);
755                 if (mdio) {
756                         mdio_bus_switch = of_mdio_find_bus(mdio);
757                         if (!mdio_bus_switch) {
758                                 ret = -EPROBE_DEFER;
759                                 goto out_free_chip;
760                         }
761 
762                         /* Drop the mdio_bus device ref, replacing the host
763                          * device with the mdio_bus_switch device, keeping
764                          * the refcount from of_mdio_find_bus() above.
765                          */
766                         put_device(cd->host_dev);
767                         cd->host_dev = &mdio_bus_switch->dev;
768                 }
769 
770                 for_each_available_child_of_node(child, port) {
771                         port_reg = of_get_property(port, "reg", NULL);
772                         if (!port_reg)
773                                 continue;
774 
775                         port_index = be32_to_cpup(port_reg);
776                         if (port_index >= DSA_MAX_PORTS)
777                                 break;
778 
779                         port_name = of_get_property(port, "label", NULL);
780                         if (!port_name)
781                                 continue;
782 
783                         cd->port_dn[port_index] = port;
784 
785                         cd->port_names[port_index] = kstrdup(port_name,
786                                         GFP_KERNEL);
787                         if (!cd->port_names[port_index]) {
788                                 ret = -ENOMEM;
789                                 goto out_free_chip;
790                         }
791 
792                         ret = dsa_of_probe_links(pd, cd, chip_index,
793                                                  port_index, port, port_name);
794                         if (ret)
795                                 goto out_free_chip;
796 
797                 }
798         }
799 
800         /* The individual chips hold their own refcount on the mdio bus,
801          * so drop ours */
802         put_device(&mdio_bus->dev);
803 
804         return 0;
805 
806 out_free_chip:
807         dsa_of_free_platform_data(pd);
808 out_free:
809         kfree(pd);
810         dev->platform_data = NULL;
811 out_put_ethernet:
812         put_device(&ethernet_dev->dev);
813 out_put_mdio:
814         put_device(&mdio_bus->dev);
815         return ret;
816 }
817 
818 static void dsa_of_remove(struct device *dev)
819 {
820         struct dsa_platform_data *pd = dev->platform_data;
821 
822         if (!dev->of_node)
823                 return;
824 
825         dsa_of_free_platform_data(pd);
826         put_device(&pd->of_netdev->dev);
827         kfree(pd);
828 }
829 #else
830 static inline int dsa_of_probe(struct device *dev)
831 {
832         return 0;
833 }
834 
835 static inline void dsa_of_remove(struct device *dev)
836 {
837 }
838 #endif
839 
840 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
841                          struct device *parent, struct dsa_platform_data *pd)
842 {
843         int i;
844         unsigned configured = 0;
845 
846         dst->pd = pd;
847         dst->master_netdev = dev;
848         dst->cpu_switch = -1;
849         dst->cpu_port = -1;
850 
851         for (i = 0; i < pd->nr_chips; i++) {
852                 struct dsa_switch *ds;
853 
854                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
855                 if (IS_ERR(ds)) {
856                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
857                                    i, PTR_ERR(ds));
858                         continue;
859                 }
860 
861                 dst->ds[i] = ds;
862                 if (ds->drv->poll_link != NULL)
863                         dst->link_poll_needed = 1;
864 
865                 ++configured;
866         }
867 
868         /*
869          * If no switch was found, exit cleanly
870          */
871         if (!configured)
872                 return -EPROBE_DEFER;
873 
874         /*
875          * If we use a tagging format that doesn't have an ethertype
876          * field, make sure that all packets from this point on get
877          * sent to the tag format's receive function.
878          */
879         wmb();
880         dev->dsa_ptr = (void *)dst;
881 
882         if (dst->link_poll_needed) {
883                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
884                 init_timer(&dst->link_poll_timer);
885                 dst->link_poll_timer.data = (unsigned long)dst;
886                 dst->link_poll_timer.function = dsa_link_poll_timer;
887                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
888                 add_timer(&dst->link_poll_timer);
889         }
890 
891         return 0;
892 }
893 
894 static int dsa_probe(struct platform_device *pdev)
895 {
896         struct dsa_platform_data *pd = pdev->dev.platform_data;
897         struct net_device *dev;
898         struct dsa_switch_tree *dst;
899         int ret;
900 
901         pr_notice_once("Distributed Switch Architecture driver version %s\n",
902                        dsa_driver_version);
903 
904         if (pdev->dev.of_node) {
905                 ret = dsa_of_probe(&pdev->dev);
906                 if (ret)
907                         return ret;
908 
909                 pd = pdev->dev.platform_data;
910         }
911 
912         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
913                 return -EINVAL;
914 
915         if (pd->of_netdev) {
916                 dev = pd->of_netdev;
917                 dev_hold(dev);
918         } else {
919                 dev = dev_to_net_device(pd->netdev);
920         }
921         if (dev == NULL) {
922                 ret = -EPROBE_DEFER;
923                 goto out;
924         }
925 
926         if (dev->dsa_ptr != NULL) {
927                 dev_put(dev);
928                 ret = -EEXIST;
929                 goto out;
930         }
931 
932         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
933         if (dst == NULL) {
934                 dev_put(dev);
935                 ret = -ENOMEM;
936                 goto out;
937         }
938 
939         platform_set_drvdata(pdev, dst);
940 
941         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
942         if (ret)
943                 goto out;
944 
945         return 0;
946 
947 out:
948         dsa_of_remove(&pdev->dev);
949 
950         return ret;
951 }
952 
953 static void dsa_remove_dst(struct dsa_switch_tree *dst)
954 {
955         int i;
956 
957         if (dst->link_poll_needed)
958                 del_timer_sync(&dst->link_poll_timer);
959 
960         flush_work(&dst->link_poll_work);
961 
962         for (i = 0; i < dst->pd->nr_chips; i++) {
963                 struct dsa_switch *ds = dst->ds[i];
964 
965                 if (ds)
966                         dsa_switch_destroy(ds);
967         }
968 }
969 
970 static int dsa_remove(struct platform_device *pdev)
971 {
972         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
973 
974         dsa_remove_dst(dst);
975         dsa_of_remove(&pdev->dev);
976 
977         return 0;
978 }
979 
980 static void dsa_shutdown(struct platform_device *pdev)
981 {
982 }
983 
984 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
985                           struct packet_type *pt, struct net_device *orig_dev)
986 {
987         struct dsa_switch_tree *dst = dev->dsa_ptr;
988 
989         if (unlikely(dst == NULL)) {
990                 kfree_skb(skb);
991                 return 0;
992         }
993 
994         return dst->rcv(skb, dev, pt, orig_dev);
995 }
996 
997 static struct packet_type dsa_pack_type __read_mostly = {
998         .type   = cpu_to_be16(ETH_P_XDSA),
999         .func   = dsa_switch_rcv,
1000 };
1001 
1002 static struct notifier_block dsa_netdevice_nb __read_mostly = {
1003         .notifier_call  = dsa_slave_netdevice_event,
1004 };
1005 
1006 #ifdef CONFIG_PM_SLEEP
1007 static int dsa_suspend(struct device *d)
1008 {
1009         struct platform_device *pdev = to_platform_device(d);
1010         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1011         int i, ret = 0;
1012 
1013         for (i = 0; i < dst->pd->nr_chips; i++) {
1014                 struct dsa_switch *ds = dst->ds[i];
1015 
1016                 if (ds != NULL)
1017                         ret = dsa_switch_suspend(ds);
1018         }
1019 
1020         return ret;
1021 }
1022 
1023 static int dsa_resume(struct device *d)
1024 {
1025         struct platform_device *pdev = to_platform_device(d);
1026         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1027         int i, ret = 0;
1028 
1029         for (i = 0; i < dst->pd->nr_chips; i++) {
1030                 struct dsa_switch *ds = dst->ds[i];
1031 
1032                 if (ds != NULL)
1033                         ret = dsa_switch_resume(ds);
1034         }
1035 
1036         return ret;
1037 }
1038 #endif
1039 
1040 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1041 
1042 static const struct of_device_id dsa_of_match_table[] = {
1043         { .compatible = "brcm,bcm7445-switch-v4.0" },
1044         { .compatible = "marvell,dsa", },
1045         {}
1046 };
1047 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1048 
1049 static struct platform_driver dsa_driver = {
1050         .probe          = dsa_probe,
1051         .remove         = dsa_remove,
1052         .shutdown       = dsa_shutdown,
1053         .driver = {
1054                 .name   = "dsa",
1055                 .of_match_table = dsa_of_match_table,
1056                 .pm     = &dsa_pm_ops,
1057         },
1058 };
1059 
1060 static int __init dsa_init_module(void)
1061 {
1062         int rc;
1063 
1064         register_netdevice_notifier(&dsa_netdevice_nb);
1065 
1066         rc = platform_driver_register(&dsa_driver);
1067         if (rc)
1068                 return rc;
1069 
1070         dev_add_pack(&dsa_pack_type);
1071 
1072         return 0;
1073 }
1074 module_init(dsa_init_module);
1075 
1076 static void __exit dsa_cleanup_module(void)
1077 {
1078         unregister_netdevice_notifier(&dsa_netdevice_nb);
1079         dev_remove_pack(&dsa_pack_type);
1080         platform_driver_unregister(&dsa_driver);
1081 }
1082 module_exit(dsa_cleanup_module);
1083 
1084 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1085 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1086 MODULE_LICENSE("GPL");
1087 MODULE_ALIAS("platform:dsa");
1088 

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