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 4.5

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

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