Version:  2.0.40 2.2.26 2.4.37 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 4.5 4.6 4.7

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

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