Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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/of_gpio.h>
 25 #include <linux/sysfs.h>
 26 #include <linux/phy_fixed.h>
 27 #include <linux/gpio/consumer.h>
 28 #include "dsa_priv.h"
 29 
 30 char dsa_driver_version[] = "0.1";
 31 
 32 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 33                                             struct net_device *dev)
 34 {
 35         /* Just return the original SKB */
 36         return skb;
 37 }
 38 
 39 static const struct dsa_device_ops none_ops = {
 40         .xmit   = dsa_slave_notag_xmit,
 41         .rcv    = NULL,
 42 };
 43 
 44 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
 45 #ifdef CONFIG_NET_DSA_TAG_DSA
 46         [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
 47 #endif
 48 #ifdef CONFIG_NET_DSA_TAG_EDSA
 49         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
 50 #endif
 51 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 52         [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
 53 #endif
 54 #ifdef CONFIG_NET_DSA_TAG_BRCM
 55         [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
 56 #endif
 57 #ifdef CONFIG_NET_DSA_TAG_QCA
 58         [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
 59 #endif
 60         [DSA_TAG_PROTO_NONE] = &none_ops,
 61 };
 62 
 63 /* switch driver registration ***********************************************/
 64 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
 65 static LIST_HEAD(dsa_switch_drivers);
 66 
 67 void register_switch_driver(struct dsa_switch_ops *ops)
 68 {
 69         mutex_lock(&dsa_switch_drivers_mutex);
 70         list_add_tail(&ops->list, &dsa_switch_drivers);
 71         mutex_unlock(&dsa_switch_drivers_mutex);
 72 }
 73 EXPORT_SYMBOL_GPL(register_switch_driver);
 74 
 75 void unregister_switch_driver(struct dsa_switch_ops *ops)
 76 {
 77         mutex_lock(&dsa_switch_drivers_mutex);
 78         list_del_init(&ops->list);
 79         mutex_unlock(&dsa_switch_drivers_mutex);
 80 }
 81 EXPORT_SYMBOL_GPL(unregister_switch_driver);
 82 
 83 static struct dsa_switch_ops *
 84 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
 85                  const char **_name, void **priv)
 86 {
 87         struct dsa_switch_ops *ret;
 88         struct list_head *list;
 89         const char *name;
 90 
 91         ret = NULL;
 92         name = NULL;
 93 
 94         mutex_lock(&dsa_switch_drivers_mutex);
 95         list_for_each(list, &dsa_switch_drivers) {
 96                 struct dsa_switch_ops *ops;
 97 
 98                 ops = list_entry(list, struct dsa_switch_ops, list);
 99 
100                 name = ops->probe(parent, host_dev, sw_addr, priv);
101                 if (name != NULL) {
102                         ret = ops;
103                         break;
104                 }
105         }
106         mutex_unlock(&dsa_switch_drivers_mutex);
107 
108         *_name = name;
109 
110         return ret;
111 }
112 
113 /* hwmon support ************************************************************/
114 
115 #ifdef CONFIG_NET_DSA_HWMON
116 
117 static ssize_t temp1_input_show(struct device *dev,
118                                 struct device_attribute *attr, char *buf)
119 {
120         struct dsa_switch *ds = dev_get_drvdata(dev);
121         int temp, ret;
122 
123         ret = ds->ops->get_temp(ds, &temp);
124         if (ret < 0)
125                 return ret;
126 
127         return sprintf(buf, "%d\n", temp * 1000);
128 }
129 static DEVICE_ATTR_RO(temp1_input);
130 
131 static ssize_t temp1_max_show(struct device *dev,
132                               struct device_attribute *attr, char *buf)
133 {
134         struct dsa_switch *ds = dev_get_drvdata(dev);
135         int temp, ret;
136 
137         ret = ds->ops->get_temp_limit(ds, &temp);
138         if (ret < 0)
139                 return ret;
140 
141         return sprintf(buf, "%d\n", temp * 1000);
142 }
143 
144 static ssize_t temp1_max_store(struct device *dev,
145                                struct device_attribute *attr, const char *buf,
146                                size_t count)
147 {
148         struct dsa_switch *ds = dev_get_drvdata(dev);
149         int temp, ret;
150 
151         ret = kstrtoint(buf, 0, &temp);
152         if (ret < 0)
153                 return ret;
154 
155         ret = ds->ops->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
156         if (ret < 0)
157                 return ret;
158 
159         return count;
160 }
161 static DEVICE_ATTR_RW(temp1_max);
162 
163 static ssize_t temp1_max_alarm_show(struct device *dev,
164                                     struct device_attribute *attr, char *buf)
165 {
166         struct dsa_switch *ds = dev_get_drvdata(dev);
167         bool alarm;
168         int ret;
169 
170         ret = ds->ops->get_temp_alarm(ds, &alarm);
171         if (ret < 0)
172                 return ret;
173 
174         return sprintf(buf, "%d\n", alarm);
175 }
176 static DEVICE_ATTR_RO(temp1_max_alarm);
177 
178 static struct attribute *dsa_hwmon_attrs[] = {
179         &dev_attr_temp1_input.attr,     /* 0 */
180         &dev_attr_temp1_max.attr,       /* 1 */
181         &dev_attr_temp1_max_alarm.attr, /* 2 */
182         NULL
183 };
184 
185 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
186                                        struct attribute *attr, int index)
187 {
188         struct device *dev = container_of(kobj, struct device, kobj);
189         struct dsa_switch *ds = dev_get_drvdata(dev);
190         struct dsa_switch_ops *ops = ds->ops;
191         umode_t mode = attr->mode;
192 
193         if (index == 1) {
194                 if (!ops->get_temp_limit)
195                         mode = 0;
196                 else if (!ops->set_temp_limit)
197                         mode &= ~S_IWUSR;
198         } else if (index == 2 && !ops->get_temp_alarm) {
199                 mode = 0;
200         }
201         return mode;
202 }
203 
204 static const struct attribute_group dsa_hwmon_group = {
205         .attrs = dsa_hwmon_attrs,
206         .is_visible = dsa_hwmon_attrs_visible,
207 };
208 __ATTRIBUTE_GROUPS(dsa_hwmon);
209 
210 #endif /* CONFIG_NET_DSA_HWMON */
211 
212 /* basic switch operations **************************************************/
213 int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
214                       struct device_node *port_dn, int port)
215 {
216         struct phy_device *phydev;
217         int ret, mode;
218 
219         if (of_phy_is_fixed_link(port_dn)) {
220                 ret = of_phy_register_fixed_link(port_dn);
221                 if (ret) {
222                         dev_err(dev, "failed to register fixed PHY\n");
223                         return ret;
224                 }
225                 phydev = of_phy_find_device(port_dn);
226 
227                 mode = of_get_phy_mode(port_dn);
228                 if (mode < 0)
229                         mode = PHY_INTERFACE_MODE_NA;
230                 phydev->interface = mode;
231 
232                 genphy_config_init(phydev);
233                 genphy_read_status(phydev);
234                 if (ds->ops->adjust_link)
235                         ds->ops->adjust_link(ds, port, phydev);
236 
237                 put_device(&phydev->mdio.dev);
238         }
239 
240         return 0;
241 }
242 
243 static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
244 {
245         struct device_node *port_dn;
246         int ret, port;
247 
248         for (port = 0; port < DSA_MAX_PORTS; port++) {
249                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
250                         continue;
251 
252                 port_dn = ds->ports[port].dn;
253                 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
254                 if (ret)
255                         return ret;
256         }
257         return 0;
258 }
259 
260 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
261 {
262         const struct dsa_device_ops *ops;
263 
264         if (tag_protocol >= DSA_TAG_LAST)
265                 return ERR_PTR(-EINVAL);
266         ops = dsa_device_ops[tag_protocol];
267 
268         if (!ops)
269                 return ERR_PTR(-ENOPROTOOPT);
270 
271         return ops;
272 }
273 
274 int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
275 {
276         struct net_device *master;
277         struct ethtool_ops *cpu_ops;
278 
279         master = ds->dst->master_netdev;
280         if (ds->master_netdev)
281                 master = ds->master_netdev;
282 
283         cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
284         if (!cpu_ops)
285                 return -ENOMEM;
286 
287         memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
288                sizeof(struct ethtool_ops));
289         ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
290         memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
291                sizeof(struct ethtool_ops));
292         dsa_cpu_port_ethtool_init(cpu_ops);
293         master->ethtool_ops = cpu_ops;
294 
295         return 0;
296 }
297 
298 void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
299 {
300         struct net_device *master;
301 
302         master = ds->dst->master_netdev;
303         if (ds->master_netdev)
304                 master = ds->master_netdev;
305 
306         master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
307 }
308 
309 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
310 {
311         struct dsa_switch_ops *ops = ds->ops;
312         struct dsa_switch_tree *dst = ds->dst;
313         struct dsa_chip_data *cd = ds->cd;
314         bool valid_name_found = false;
315         int index = ds->index;
316         int i, ret;
317 
318         /*
319          * Validate supplied switch configuration.
320          */
321         for (i = 0; i < DSA_MAX_PORTS; i++) {
322                 char *name;
323 
324                 name = cd->port_names[i];
325                 if (name == NULL)
326                         continue;
327 
328                 if (!strcmp(name, "cpu")) {
329                         if (dst->cpu_switch != -1) {
330                                 netdev_err(dst->master_netdev,
331                                            "multiple cpu ports?!\n");
332                                 ret = -EINVAL;
333                                 goto out;
334                         }
335                         dst->cpu_switch = index;
336                         dst->cpu_port = i;
337                         ds->cpu_port_mask |= 1 << i;
338                 } else if (!strcmp(name, "dsa")) {
339                         ds->dsa_port_mask |= 1 << i;
340                 } else {
341                         ds->enabled_port_mask |= 1 << i;
342                 }
343                 valid_name_found = true;
344         }
345 
346         if (!valid_name_found && i == DSA_MAX_PORTS) {
347                 ret = -EINVAL;
348                 goto out;
349         }
350 
351         /* Make the built-in MII bus mask match the number of ports,
352          * switch drivers can override this later
353          */
354         ds->phys_mii_mask = ds->enabled_port_mask;
355 
356         /*
357          * If the CPU connects to this switch, set the switch tree
358          * tagging protocol to the preferred tagging format of this
359          * switch.
360          */
361         if (dst->cpu_switch == index) {
362                 enum dsa_tag_protocol tag_protocol;
363 
364                 tag_protocol = ops->get_tag_protocol(ds);
365                 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
366                 if (IS_ERR(dst->tag_ops)) {
367                         ret = PTR_ERR(dst->tag_ops);
368                         goto out;
369                 }
370 
371                 dst->rcv = dst->tag_ops->rcv;
372         }
373 
374         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
375 
376         /*
377          * Do basic register setup.
378          */
379         ret = ops->setup(ds);
380         if (ret < 0)
381                 goto out;
382 
383         if (ops->set_addr) {
384                 ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
385                 if (ret < 0)
386                         goto out;
387         }
388 
389         if (!ds->slave_mii_bus && ops->phy_read) {
390                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
391                 if (!ds->slave_mii_bus) {
392                         ret = -ENOMEM;
393                         goto out;
394                 }
395                 dsa_slave_mii_bus_init(ds);
396 
397                 ret = mdiobus_register(ds->slave_mii_bus);
398                 if (ret < 0)
399                         goto out;
400         }
401 
402         /*
403          * Create network devices for physical switch ports.
404          */
405         for (i = 0; i < DSA_MAX_PORTS; i++) {
406                 ds->ports[i].dn = cd->port_dn[i];
407 
408                 if (!(ds->enabled_port_mask & (1 << i)))
409                         continue;
410 
411                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
412                 if (ret < 0) {
413                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
414                                    index, i, cd->port_names[i], ret);
415                         ret = 0;
416                 }
417         }
418 
419         /* Perform configuration of the CPU and DSA ports */
420         ret = dsa_cpu_dsa_setups(ds, parent);
421         if (ret < 0) {
422                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
423                            index);
424                 ret = 0;
425         }
426 
427         ret = dsa_cpu_port_ethtool_setup(ds);
428         if (ret)
429                 return ret;
430 
431 #ifdef CONFIG_NET_DSA_HWMON
432         /* If the switch provides a temperature sensor,
433          * register with hardware monitoring subsystem.
434          * Treat registration error as non-fatal and ignore it.
435          */
436         if (ops->get_temp) {
437                 const char *netname = netdev_name(dst->master_netdev);
438                 char hname[IFNAMSIZ + 1];
439                 int i, j;
440 
441                 /* Create valid hwmon 'name' attribute */
442                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
443                         if (isalnum(netname[i]))
444                                 hname[j++] = netname[i];
445                 }
446                 hname[j] = '\0';
447                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
448                           hname, index);
449                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
450                                         ds->hwmon_name, ds, dsa_hwmon_groups);
451                 if (IS_ERR(ds->hwmon_dev))
452                         ds->hwmon_dev = NULL;
453         }
454 #endif /* CONFIG_NET_DSA_HWMON */
455 
456         return ret;
457 
458 out:
459         return ret;
460 }
461 
462 static struct dsa_switch *
463 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
464                  struct device *parent, struct device *host_dev)
465 {
466         struct dsa_chip_data *cd = dst->pd->chip + index;
467         struct dsa_switch_ops *ops;
468         struct dsa_switch *ds;
469         int ret;
470         const char *name;
471         void *priv;
472 
473         /*
474          * Probe for switch model.
475          */
476         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
477         if (!ops) {
478                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
479                            index);
480                 return ERR_PTR(-EINVAL);
481         }
482         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
483                     index, name);
484 
485 
486         /*
487          * Allocate and initialise switch state.
488          */
489         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
490         if (ds == NULL)
491                 return ERR_PTR(-ENOMEM);
492 
493         ds->dst = dst;
494         ds->index = index;
495         ds->cd = cd;
496         ds->ops = ops;
497         ds->priv = priv;
498         ds->dev = parent;
499 
500         ret = dsa_switch_setup_one(ds, parent);
501         if (ret)
502                 return ERR_PTR(ret);
503 
504         return ds;
505 }
506 
507 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
508 {
509         if (of_phy_is_fixed_link(port_dn))
510                 of_phy_deregister_fixed_link(port_dn);
511 }
512 
513 static void dsa_switch_destroy(struct dsa_switch *ds)
514 {
515         int port;
516 
517 #ifdef CONFIG_NET_DSA_HWMON
518         if (ds->hwmon_dev)
519                 hwmon_device_unregister(ds->hwmon_dev);
520 #endif
521 
522         /* Destroy network devices for physical switch ports. */
523         for (port = 0; port < DSA_MAX_PORTS; port++) {
524                 if (!(ds->enabled_port_mask & (1 << port)))
525                         continue;
526 
527                 if (!ds->ports[port].netdev)
528                         continue;
529 
530                 dsa_slave_destroy(ds->ports[port].netdev);
531         }
532 
533         /* Disable configuration of the CPU and DSA ports */
534         for (port = 0; port < DSA_MAX_PORTS; port++) {
535                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
536                         continue;
537                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
538 
539                 /* Clearing a bit which is not set does no harm */
540                 ds->cpu_port_mask |= ~(1 << port);
541                 ds->dsa_port_mask |= ~(1 << port);
542         }
543 
544         if (ds->slave_mii_bus && ds->ops->phy_read)
545                 mdiobus_unregister(ds->slave_mii_bus);
546 }
547 
548 #ifdef CONFIG_PM_SLEEP
549 int dsa_switch_suspend(struct dsa_switch *ds)
550 {
551         int i, ret = 0;
552 
553         /* Suspend slave network devices */
554         for (i = 0; i < DSA_MAX_PORTS; i++) {
555                 if (!dsa_is_port_initialized(ds, i))
556                         continue;
557 
558                 ret = dsa_slave_suspend(ds->ports[i].netdev);
559                 if (ret)
560                         return ret;
561         }
562 
563         if (ds->ops->suspend)
564                 ret = ds->ops->suspend(ds);
565 
566         return ret;
567 }
568 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
569 
570 int dsa_switch_resume(struct dsa_switch *ds)
571 {
572         int i, ret = 0;
573 
574         if (ds->ops->resume)
575                 ret = ds->ops->resume(ds);
576 
577         if (ret)
578                 return ret;
579 
580         /* Resume slave network devices */
581         for (i = 0; i < DSA_MAX_PORTS; i++) {
582                 if (!dsa_is_port_initialized(ds, i))
583                         continue;
584 
585                 ret = dsa_slave_resume(ds->ports[i].netdev);
586                 if (ret)
587                         return ret;
588         }
589 
590         return 0;
591 }
592 EXPORT_SYMBOL_GPL(dsa_switch_resume);
593 #endif
594 
595 /* platform driver init and cleanup *****************************************/
596 static int dev_is_class(struct device *dev, void *class)
597 {
598         if (dev->class != NULL && !strcmp(dev->class->name, class))
599                 return 1;
600 
601         return 0;
602 }
603 
604 static struct device *dev_find_class(struct device *parent, char *class)
605 {
606         if (dev_is_class(parent, class)) {
607                 get_device(parent);
608                 return parent;
609         }
610 
611         return device_find_child(parent, class, dev_is_class);
612 }
613 
614 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
615 {
616         struct device *d;
617 
618         d = dev_find_class(dev, "mdio_bus");
619         if (d != NULL) {
620                 struct mii_bus *bus;
621 
622                 bus = to_mii_bus(d);
623                 put_device(d);
624 
625                 return bus;
626         }
627 
628         return NULL;
629 }
630 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
631 
632 static struct net_device *dev_to_net_device(struct device *dev)
633 {
634         struct device *d;
635 
636         d = dev_find_class(dev, "net");
637         if (d != NULL) {
638                 struct net_device *nd;
639 
640                 nd = to_net_dev(d);
641                 dev_hold(nd);
642                 put_device(d);
643 
644                 return nd;
645         }
646 
647         return NULL;
648 }
649 
650 #ifdef CONFIG_OF
651 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
652                                         struct dsa_chip_data *cd,
653                                         int chip_index, int port_index,
654                                         struct device_node *link)
655 {
656         const __be32 *reg;
657         int link_sw_addr;
658         struct device_node *parent_sw;
659         int len;
660 
661         parent_sw = of_get_parent(link);
662         if (!parent_sw)
663                 return -EINVAL;
664 
665         reg = of_get_property(parent_sw, "reg", &len);
666         if (!reg || (len != sizeof(*reg) * 2))
667                 return -EINVAL;
668 
669         /*
670          * Get the destination switch number from the second field of its 'reg'
671          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
672          */
673         link_sw_addr = be32_to_cpup(reg + 1);
674 
675         if (link_sw_addr >= pd->nr_chips)
676                 return -EINVAL;
677 
678         cd->rtable[link_sw_addr] = port_index;
679 
680         return 0;
681 }
682 
683 static int dsa_of_probe_links(struct dsa_platform_data *pd,
684                               struct dsa_chip_data *cd,
685                               int chip_index, int port_index,
686                               struct device_node *port,
687                               const char *port_name)
688 {
689         struct device_node *link;
690         int link_index;
691         int ret;
692 
693         for (link_index = 0;; link_index++) {
694                 link = of_parse_phandle(port, "link", link_index);
695                 if (!link)
696                         break;
697 
698                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
699                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
700                                                          port_index, link);
701                         if (ret)
702                                 return ret;
703                 }
704         }
705         return 0;
706 }
707 
708 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
709 {
710         int i;
711         int port_index;
712 
713         for (i = 0; i < pd->nr_chips; i++) {
714                 port_index = 0;
715                 while (port_index < DSA_MAX_PORTS) {
716                         kfree(pd->chip[i].port_names[port_index]);
717                         port_index++;
718                 }
719 
720                 /* Drop our reference to the MDIO bus device */
721                 if (pd->chip[i].host_dev)
722                         put_device(pd->chip[i].host_dev);
723         }
724         kfree(pd->chip);
725 }
726 
727 static int dsa_of_probe(struct device *dev)
728 {
729         struct device_node *np = dev->of_node;
730         struct device_node *child, *mdio, *ethernet, *port;
731         struct mii_bus *mdio_bus, *mdio_bus_switch;
732         struct net_device *ethernet_dev;
733         struct dsa_platform_data *pd;
734         struct dsa_chip_data *cd;
735         const char *port_name;
736         int chip_index, port_index;
737         const unsigned int *sw_addr, *port_reg;
738         u32 eeprom_len;
739         int ret;
740 
741         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
742         if (!mdio)
743                 return -EINVAL;
744 
745         mdio_bus = of_mdio_find_bus(mdio);
746         if (!mdio_bus)
747                 return -EPROBE_DEFER;
748 
749         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
750         if (!ethernet) {
751                 ret = -EINVAL;
752                 goto out_put_mdio;
753         }
754 
755         ethernet_dev = of_find_net_device_by_node(ethernet);
756         if (!ethernet_dev) {
757                 ret = -EPROBE_DEFER;
758                 goto out_put_mdio;
759         }
760 
761         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
762         if (!pd) {
763                 ret = -ENOMEM;
764                 goto out_put_ethernet;
765         }
766 
767         dev->platform_data = pd;
768         pd->of_netdev = ethernet_dev;
769         pd->nr_chips = of_get_available_child_count(np);
770         if (pd->nr_chips > DSA_MAX_SWITCHES)
771                 pd->nr_chips = DSA_MAX_SWITCHES;
772 
773         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
774                            GFP_KERNEL);
775         if (!pd->chip) {
776                 ret = -ENOMEM;
777                 goto out_free;
778         }
779 
780         chip_index = -1;
781         for_each_available_child_of_node(np, child) {
782                 int i;
783 
784                 chip_index++;
785                 cd = &pd->chip[chip_index];
786 
787                 cd->of_node = child;
788 
789                 /* Initialize the routing table */
790                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
791                         cd->rtable[i] = DSA_RTABLE_NONE;
792 
793                 /* When assigning the host device, increment its refcount */
794                 cd->host_dev = get_device(&mdio_bus->dev);
795 
796                 sw_addr = of_get_property(child, "reg", NULL);
797                 if (!sw_addr)
798                         continue;
799 
800                 cd->sw_addr = be32_to_cpup(sw_addr);
801                 if (cd->sw_addr >= PHY_MAX_ADDR)
802                         continue;
803 
804                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
805                         cd->eeprom_len = eeprom_len;
806 
807                 mdio = of_parse_phandle(child, "mii-bus", 0);
808                 if (mdio) {
809                         mdio_bus_switch = of_mdio_find_bus(mdio);
810                         if (!mdio_bus_switch) {
811                                 ret = -EPROBE_DEFER;
812                                 goto out_free_chip;
813                         }
814 
815                         /* Drop the mdio_bus device ref, replacing the host
816                          * device with the mdio_bus_switch device, keeping
817                          * the refcount from of_mdio_find_bus() above.
818                          */
819                         put_device(cd->host_dev);
820                         cd->host_dev = &mdio_bus_switch->dev;
821                 }
822 
823                 for_each_available_child_of_node(child, port) {
824                         port_reg = of_get_property(port, "reg", NULL);
825                         if (!port_reg)
826                                 continue;
827 
828                         port_index = be32_to_cpup(port_reg);
829                         if (port_index >= DSA_MAX_PORTS)
830                                 break;
831 
832                         port_name = of_get_property(port, "label", NULL);
833                         if (!port_name)
834                                 continue;
835 
836                         cd->port_dn[port_index] = port;
837 
838                         cd->port_names[port_index] = kstrdup(port_name,
839                                         GFP_KERNEL);
840                         if (!cd->port_names[port_index]) {
841                                 ret = -ENOMEM;
842                                 goto out_free_chip;
843                         }
844 
845                         ret = dsa_of_probe_links(pd, cd, chip_index,
846                                                  port_index, port, port_name);
847                         if (ret)
848                                 goto out_free_chip;
849 
850                 }
851         }
852 
853         /* The individual chips hold their own refcount on the mdio bus,
854          * so drop ours */
855         put_device(&mdio_bus->dev);
856 
857         return 0;
858 
859 out_free_chip:
860         dsa_of_free_platform_data(pd);
861 out_free:
862         kfree(pd);
863         dev->platform_data = NULL;
864 out_put_ethernet:
865         put_device(&ethernet_dev->dev);
866 out_put_mdio:
867         put_device(&mdio_bus->dev);
868         return ret;
869 }
870 
871 static void dsa_of_remove(struct device *dev)
872 {
873         struct dsa_platform_data *pd = dev->platform_data;
874 
875         if (!dev->of_node)
876                 return;
877 
878         dsa_of_free_platform_data(pd);
879         put_device(&pd->of_netdev->dev);
880         kfree(pd);
881 }
882 #else
883 static inline int dsa_of_probe(struct device *dev)
884 {
885         return 0;
886 }
887 
888 static inline void dsa_of_remove(struct device *dev)
889 {
890 }
891 #endif
892 
893 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
894                          struct device *parent, struct dsa_platform_data *pd)
895 {
896         int i;
897         unsigned configured = 0;
898 
899         dst->pd = pd;
900         dst->master_netdev = dev;
901         dst->cpu_switch = -1;
902         dst->cpu_port = -1;
903 
904         for (i = 0; i < pd->nr_chips; i++) {
905                 struct dsa_switch *ds;
906 
907                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
908                 if (IS_ERR(ds)) {
909                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
910                                    i, PTR_ERR(ds));
911                         continue;
912                 }
913 
914                 dst->ds[i] = ds;
915 
916                 ++configured;
917         }
918 
919         /*
920          * If no switch was found, exit cleanly
921          */
922         if (!configured)
923                 return -EPROBE_DEFER;
924 
925         /*
926          * If we use a tagging format that doesn't have an ethertype
927          * field, make sure that all packets from this point on get
928          * sent to the tag format's receive function.
929          */
930         wmb();
931         dev->dsa_ptr = (void *)dst;
932 
933         return 0;
934 }
935 
936 static int dsa_probe(struct platform_device *pdev)
937 {
938         struct dsa_platform_data *pd = pdev->dev.platform_data;
939         struct net_device *dev;
940         struct dsa_switch_tree *dst;
941         int ret;
942 
943         pr_notice_once("Distributed Switch Architecture driver version %s\n",
944                        dsa_driver_version);
945 
946         if (pdev->dev.of_node) {
947                 ret = dsa_of_probe(&pdev->dev);
948                 if (ret)
949                         return ret;
950 
951                 pd = pdev->dev.platform_data;
952         }
953 
954         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
955                 return -EINVAL;
956 
957         if (pd->of_netdev) {
958                 dev = pd->of_netdev;
959                 dev_hold(dev);
960         } else {
961                 dev = dev_to_net_device(pd->netdev);
962         }
963         if (dev == NULL) {
964                 ret = -EPROBE_DEFER;
965                 goto out;
966         }
967 
968         if (dev->dsa_ptr != NULL) {
969                 dev_put(dev);
970                 ret = -EEXIST;
971                 goto out;
972         }
973 
974         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
975         if (dst == NULL) {
976                 dev_put(dev);
977                 ret = -ENOMEM;
978                 goto out;
979         }
980 
981         platform_set_drvdata(pdev, dst);
982 
983         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
984         if (ret) {
985                 dev_put(dev);
986                 goto out;
987         }
988 
989         return 0;
990 
991 out:
992         dsa_of_remove(&pdev->dev);
993 
994         return ret;
995 }
996 
997 static void dsa_remove_dst(struct dsa_switch_tree *dst)
998 {
999         int i;
1000 
1001         dst->master_netdev->dsa_ptr = NULL;
1002 
1003         /* If we used a tagging format that doesn't have an ethertype
1004          * field, make sure that all packets from this point get sent
1005          * without the tag and go through the regular receive path.
1006          */
1007         wmb();
1008 
1009         for (i = 0; i < dst->pd->nr_chips; i++) {
1010                 struct dsa_switch *ds = dst->ds[i];
1011 
1012                 if (ds)
1013                         dsa_switch_destroy(ds);
1014         }
1015 
1016         dsa_cpu_port_ethtool_restore(dst->ds[0]);
1017 
1018         dev_put(dst->master_netdev);
1019 }
1020 
1021 static int dsa_remove(struct platform_device *pdev)
1022 {
1023         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1024 
1025         dsa_remove_dst(dst);
1026         dsa_of_remove(&pdev->dev);
1027 
1028         return 0;
1029 }
1030 
1031 static void dsa_shutdown(struct platform_device *pdev)
1032 {
1033 }
1034 
1035 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
1036                           struct packet_type *pt, struct net_device *orig_dev)
1037 {
1038         struct dsa_switch_tree *dst = dev->dsa_ptr;
1039 
1040         if (unlikely(dst == NULL)) {
1041                 kfree_skb(skb);
1042                 return 0;
1043         }
1044 
1045         return dst->rcv(skb, dev, pt, orig_dev);
1046 }
1047 
1048 static struct packet_type dsa_pack_type __read_mostly = {
1049         .type   = cpu_to_be16(ETH_P_XDSA),
1050         .func   = dsa_switch_rcv,
1051 };
1052 
1053 static struct notifier_block dsa_netdevice_nb __read_mostly = {
1054         .notifier_call  = dsa_slave_netdevice_event,
1055 };
1056 
1057 #ifdef CONFIG_PM_SLEEP
1058 static int dsa_suspend(struct device *d)
1059 {
1060         struct platform_device *pdev = to_platform_device(d);
1061         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1062         int i, ret = 0;
1063 
1064         for (i = 0; i < dst->pd->nr_chips; i++) {
1065                 struct dsa_switch *ds = dst->ds[i];
1066 
1067                 if (ds != NULL)
1068                         ret = dsa_switch_suspend(ds);
1069         }
1070 
1071         return ret;
1072 }
1073 
1074 static int dsa_resume(struct device *d)
1075 {
1076         struct platform_device *pdev = to_platform_device(d);
1077         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1078         int i, ret = 0;
1079 
1080         for (i = 0; i < dst->pd->nr_chips; i++) {
1081                 struct dsa_switch *ds = dst->ds[i];
1082 
1083                 if (ds != NULL)
1084                         ret = dsa_switch_resume(ds);
1085         }
1086 
1087         return ret;
1088 }
1089 #endif
1090 
1091 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1092 
1093 static const struct of_device_id dsa_of_match_table[] = {
1094         { .compatible = "marvell,dsa", },
1095         {}
1096 };
1097 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1098 
1099 static struct platform_driver dsa_driver = {
1100         .probe          = dsa_probe,
1101         .remove         = dsa_remove,
1102         .shutdown       = dsa_shutdown,
1103         .driver = {
1104                 .name   = "dsa",
1105                 .of_match_table = dsa_of_match_table,
1106                 .pm     = &dsa_pm_ops,
1107         },
1108 };
1109 
1110 static int __init dsa_init_module(void)
1111 {
1112         int rc;
1113 
1114         register_netdevice_notifier(&dsa_netdevice_nb);
1115 
1116         rc = platform_driver_register(&dsa_driver);
1117         if (rc)
1118                 return rc;
1119 
1120         dev_add_pack(&dsa_pack_type);
1121 
1122         return 0;
1123 }
1124 module_init(dsa_init_module);
1125 
1126 static void __exit dsa_cleanup_module(void)
1127 {
1128         unregister_netdevice_notifier(&dsa_netdevice_nb);
1129         dev_remove_pack(&dsa_pack_type);
1130         platform_driver_unregister(&dsa_driver);
1131 }
1132 module_exit(dsa_cleanup_module);
1133 
1134 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1135 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1136 MODULE_LICENSE("GPL");
1137 MODULE_ALIAS("platform:dsa");
1138 

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