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Linux/net/dsa/legacy.c

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  1 /*
  2  * net/dsa/legacy.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/device.h>
 13 #include <linux/list.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/slab.h>
 16 #include <linux/module.h>
 17 #include <linux/of.h>
 18 #include <linux/of_mdio.h>
 19 #include <linux/of_platform.h>
 20 #include <linux/of_net.h>
 21 #include <linux/netdevice.h>
 22 #include <linux/sysfs.h>
 23 #include <linux/phy_fixed.h>
 24 #include <linux/etherdevice.h>
 25 
 26 #include "dsa_priv.h"
 27 
 28 /* switch driver registration ***********************************************/
 29 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
 30 static LIST_HEAD(dsa_switch_drivers);
 31 
 32 void register_switch_driver(struct dsa_switch_driver *drv)
 33 {
 34         mutex_lock(&dsa_switch_drivers_mutex);
 35         list_add_tail(&drv->list, &dsa_switch_drivers);
 36         mutex_unlock(&dsa_switch_drivers_mutex);
 37 }
 38 EXPORT_SYMBOL_GPL(register_switch_driver);
 39 
 40 void unregister_switch_driver(struct dsa_switch_driver *drv)
 41 {
 42         mutex_lock(&dsa_switch_drivers_mutex);
 43         list_del_init(&drv->list);
 44         mutex_unlock(&dsa_switch_drivers_mutex);
 45 }
 46 EXPORT_SYMBOL_GPL(unregister_switch_driver);
 47 
 48 static const struct dsa_switch_ops *
 49 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
 50                  const char **_name, void **priv)
 51 {
 52         const struct dsa_switch_ops *ret;
 53         struct list_head *list;
 54         const char *name;
 55 
 56         ret = NULL;
 57         name = NULL;
 58 
 59         mutex_lock(&dsa_switch_drivers_mutex);
 60         list_for_each(list, &dsa_switch_drivers) {
 61                 const struct dsa_switch_ops *ops;
 62                 struct dsa_switch_driver *drv;
 63 
 64                 drv = list_entry(list, struct dsa_switch_driver, list);
 65                 ops = drv->ops;
 66 
 67                 name = ops->probe(parent, host_dev, sw_addr, priv);
 68                 if (name != NULL) {
 69                         ret = ops;
 70                         break;
 71                 }
 72         }
 73         mutex_unlock(&dsa_switch_drivers_mutex);
 74 
 75         *_name = name;
 76 
 77         return ret;
 78 }
 79 
 80 /* basic switch operations **************************************************/
 81 static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
 82 {
 83         int ret, port;
 84 
 85         for (port = 0; port < ds->num_ports; port++) {
 86                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 87                         continue;
 88 
 89                 ret = dsa_port_link_register_of(&ds->ports[port]);
 90                 if (ret)
 91                         return ret;
 92         }
 93         return 0;
 94 }
 95 
 96 static int dsa_switch_setup_one(struct dsa_switch *ds,
 97                                 struct net_device *master)
 98 {
 99         const struct dsa_switch_ops *ops = ds->ops;
100         struct dsa_switch_tree *dst = ds->dst;
101         struct dsa_chip_data *cd = ds->cd;
102         bool valid_name_found = false;
103         int index = ds->index;
104         struct dsa_port *dp;
105         int i, ret;
106 
107         /*
108          * Validate supplied switch configuration.
109          */
110         for (i = 0; i < ds->num_ports; i++) {
111                 char *name;
112 
113                 dp = &ds->ports[i];
114 
115                 name = cd->port_names[i];
116                 if (name == NULL)
117                         continue;
118                 dp->name = name;
119 
120                 if (!strcmp(name, "cpu")) {
121                         if (dst->cpu_dp) {
122                                 netdev_err(master,
123                                            "multiple cpu ports?!\n");
124                                 return -EINVAL;
125                         }
126                         dst->cpu_dp = &ds->ports[i];
127                         dst->cpu_dp->master = master;
128                         dp->type = DSA_PORT_TYPE_CPU;
129                 } else if (!strcmp(name, "dsa")) {
130                         dp->type = DSA_PORT_TYPE_DSA;
131                 } else {
132                         dp->type = DSA_PORT_TYPE_USER;
133                 }
134                 valid_name_found = true;
135         }
136 
137         if (!valid_name_found && i == ds->num_ports)
138                 return -EINVAL;
139 
140         /* Make the built-in MII bus mask match the number of ports,
141          * switch drivers can override this later
142          */
143         ds->phys_mii_mask |= dsa_user_ports(ds);
144 
145         /*
146          * If the CPU connects to this switch, set the switch tree
147          * tagging protocol to the preferred tagging format of this
148          * switch.
149          */
150         if (dst->cpu_dp->ds == ds) {
151                 const struct dsa_device_ops *tag_ops;
152                 enum dsa_tag_protocol tag_protocol;
153 
154                 tag_protocol = ops->get_tag_protocol(ds, dst->cpu_dp->index);
155                 tag_ops = dsa_resolve_tag_protocol(tag_protocol);
156                 if (IS_ERR(tag_ops))
157                         return PTR_ERR(tag_ops);
158 
159                 dst->cpu_dp->tag_ops = tag_ops;
160 
161                 /* Few copies for faster access in master receive hot path */
162                 dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
163                 dst->cpu_dp->dst = dst;
164         }
165 
166         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
167 
168         /*
169          * Do basic register setup.
170          */
171         ret = ops->setup(ds);
172         if (ret < 0)
173                 return ret;
174 
175         ret = dsa_switch_register_notifier(ds);
176         if (ret)
177                 return ret;
178 
179         if (!ds->slave_mii_bus && ops->phy_read) {
180                 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
181                 if (!ds->slave_mii_bus)
182                         return -ENOMEM;
183                 dsa_slave_mii_bus_init(ds);
184 
185                 ret = mdiobus_register(ds->slave_mii_bus);
186                 if (ret < 0)
187                         return ret;
188         }
189 
190         /*
191          * Create network devices for physical switch ports.
192          */
193         for (i = 0; i < ds->num_ports; i++) {
194                 ds->ports[i].dn = cd->port_dn[i];
195                 ds->ports[i].cpu_dp = dst->cpu_dp;
196 
197                 if (!dsa_is_user_port(ds, i))
198                         continue;
199 
200                 ret = dsa_slave_create(&ds->ports[i]);
201                 if (ret < 0)
202                         netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
203                                    index, i, cd->port_names[i], ret);
204         }
205 
206         /* Perform configuration of the CPU and DSA ports */
207         ret = dsa_cpu_dsa_setups(ds);
208         if (ret < 0)
209                 netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
210                            index);
211 
212         return 0;
213 }
214 
215 static struct dsa_switch *
216 dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
217                  int index, struct device *parent, struct device *host_dev)
218 {
219         struct dsa_chip_data *cd = dst->pd->chip + index;
220         const struct dsa_switch_ops *ops;
221         struct dsa_switch *ds;
222         int ret;
223         const char *name;
224         void *priv;
225 
226         /*
227          * Probe for switch model.
228          */
229         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
230         if (!ops) {
231                 netdev_err(master, "[%d]: could not detect attached switch\n",
232                            index);
233                 return ERR_PTR(-EINVAL);
234         }
235         netdev_info(master, "[%d]: detected a %s switch\n",
236                     index, name);
237 
238 
239         /*
240          * Allocate and initialise switch state.
241          */
242         ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
243         if (!ds)
244                 return ERR_PTR(-ENOMEM);
245 
246         ds->dst = dst;
247         ds->index = index;
248         ds->cd = cd;
249         ds->ops = ops;
250         ds->priv = priv;
251 
252         ret = dsa_switch_setup_one(ds, master);
253         if (ret)
254                 return ERR_PTR(ret);
255 
256         return ds;
257 }
258 
259 static void dsa_switch_destroy(struct dsa_switch *ds)
260 {
261         int port;
262 
263         /* Destroy network devices for physical switch ports. */
264         for (port = 0; port < ds->num_ports; port++) {
265                 if (!dsa_is_user_port(ds, port))
266                         continue;
267 
268                 if (!ds->ports[port].slave)
269                         continue;
270 
271                 dsa_slave_destroy(ds->ports[port].slave);
272         }
273 
274         /* Disable configuration of the CPU and DSA ports */
275         for (port = 0; port < ds->num_ports; port++) {
276                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
277                         continue;
278                 dsa_port_link_unregister_of(&ds->ports[port]);
279         }
280 
281         if (ds->slave_mii_bus && ds->ops->phy_read)
282                 mdiobus_unregister(ds->slave_mii_bus);
283 
284         dsa_switch_unregister_notifier(ds);
285 }
286 
287 /* platform driver init and cleanup *****************************************/
288 static int dev_is_class(struct device *dev, void *class)
289 {
290         if (dev->class != NULL && !strcmp(dev->class->name, class))
291                 return 1;
292 
293         return 0;
294 }
295 
296 static struct device *dev_find_class(struct device *parent, char *class)
297 {
298         if (dev_is_class(parent, class)) {
299                 get_device(parent);
300                 return parent;
301         }
302 
303         return device_find_child(parent, class, dev_is_class);
304 }
305 
306 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
307 {
308         struct device *d;
309 
310         d = dev_find_class(dev, "mdio_bus");
311         if (d != NULL) {
312                 struct mii_bus *bus;
313 
314                 bus = to_mii_bus(d);
315                 put_device(d);
316 
317                 return bus;
318         }
319 
320         return NULL;
321 }
322 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
323 
324 #ifdef CONFIG_OF
325 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
326                                         struct dsa_chip_data *cd,
327                                         int chip_index, int port_index,
328                                         struct device_node *link)
329 {
330         const __be32 *reg;
331         int link_sw_addr;
332         struct device_node *parent_sw;
333         int len;
334 
335         parent_sw = of_get_parent(link);
336         if (!parent_sw)
337                 return -EINVAL;
338 
339         reg = of_get_property(parent_sw, "reg", &len);
340         if (!reg || (len != sizeof(*reg) * 2))
341                 return -EINVAL;
342 
343         /*
344          * Get the destination switch number from the second field of its 'reg'
345          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
346          */
347         link_sw_addr = be32_to_cpup(reg + 1);
348 
349         if (link_sw_addr >= pd->nr_chips)
350                 return -EINVAL;
351 
352         cd->rtable[link_sw_addr] = port_index;
353 
354         return 0;
355 }
356 
357 static int dsa_of_probe_links(struct dsa_platform_data *pd,
358                               struct dsa_chip_data *cd,
359                               int chip_index, int port_index,
360                               struct device_node *port,
361                               const char *port_name)
362 {
363         struct device_node *link;
364         int link_index;
365         int ret;
366 
367         for (link_index = 0;; link_index++) {
368                 link = of_parse_phandle(port, "link", link_index);
369                 if (!link)
370                         break;
371 
372                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
373                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
374                                                          port_index, link);
375                         if (ret)
376                                 return ret;
377                 }
378         }
379         return 0;
380 }
381 
382 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
383 {
384         int i;
385         int port_index;
386 
387         for (i = 0; i < pd->nr_chips; i++) {
388                 port_index = 0;
389                 while (port_index < DSA_MAX_PORTS) {
390                         kfree(pd->chip[i].port_names[port_index]);
391                         port_index++;
392                 }
393 
394                 /* Drop our reference to the MDIO bus device */
395                 if (pd->chip[i].host_dev)
396                         put_device(pd->chip[i].host_dev);
397         }
398         kfree(pd->chip);
399 }
400 
401 static int dsa_of_probe(struct device *dev)
402 {
403         struct device_node *np = dev->of_node;
404         struct device_node *child, *mdio, *ethernet, *port;
405         struct mii_bus *mdio_bus, *mdio_bus_switch;
406         struct net_device *ethernet_dev;
407         struct dsa_platform_data *pd;
408         struct dsa_chip_data *cd;
409         const char *port_name;
410         int chip_index, port_index;
411         const unsigned int *sw_addr, *port_reg;
412         u32 eeprom_len;
413         int ret;
414 
415         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
416         if (!mdio)
417                 return -EINVAL;
418 
419         mdio_bus = of_mdio_find_bus(mdio);
420         if (!mdio_bus)
421                 return -EPROBE_DEFER;
422 
423         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
424         if (!ethernet) {
425                 ret = -EINVAL;
426                 goto out_put_mdio;
427         }
428 
429         ethernet_dev = of_find_net_device_by_node(ethernet);
430         if (!ethernet_dev) {
431                 ret = -EPROBE_DEFER;
432                 goto out_put_mdio;
433         }
434 
435         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
436         if (!pd) {
437                 ret = -ENOMEM;
438                 goto out_put_ethernet;
439         }
440 
441         dev->platform_data = pd;
442         pd->of_netdev = ethernet_dev;
443         pd->nr_chips = of_get_available_child_count(np);
444         if (pd->nr_chips > DSA_MAX_SWITCHES)
445                 pd->nr_chips = DSA_MAX_SWITCHES;
446 
447         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
448                            GFP_KERNEL);
449         if (!pd->chip) {
450                 ret = -ENOMEM;
451                 goto out_free;
452         }
453 
454         chip_index = -1;
455         for_each_available_child_of_node(np, child) {
456                 int i;
457 
458                 chip_index++;
459                 cd = &pd->chip[chip_index];
460 
461                 cd->of_node = child;
462 
463                 /* Initialize the routing table */
464                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
465                         cd->rtable[i] = DSA_RTABLE_NONE;
466 
467                 /* When assigning the host device, increment its refcount */
468                 cd->host_dev = get_device(&mdio_bus->dev);
469 
470                 sw_addr = of_get_property(child, "reg", NULL);
471                 if (!sw_addr)
472                         continue;
473 
474                 cd->sw_addr = be32_to_cpup(sw_addr);
475                 if (cd->sw_addr >= PHY_MAX_ADDR)
476                         continue;
477 
478                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
479                         cd->eeprom_len = eeprom_len;
480 
481                 mdio = of_parse_phandle(child, "mii-bus", 0);
482                 if (mdio) {
483                         mdio_bus_switch = of_mdio_find_bus(mdio);
484                         if (!mdio_bus_switch) {
485                                 ret = -EPROBE_DEFER;
486                                 goto out_free_chip;
487                         }
488 
489                         /* Drop the mdio_bus device ref, replacing the host
490                          * device with the mdio_bus_switch device, keeping
491                          * the refcount from of_mdio_find_bus() above.
492                          */
493                         put_device(cd->host_dev);
494                         cd->host_dev = &mdio_bus_switch->dev;
495                 }
496 
497                 for_each_available_child_of_node(child, port) {
498                         port_reg = of_get_property(port, "reg", NULL);
499                         if (!port_reg)
500                                 continue;
501 
502                         port_index = be32_to_cpup(port_reg);
503                         if (port_index >= DSA_MAX_PORTS)
504                                 break;
505 
506                         port_name = of_get_property(port, "label", NULL);
507                         if (!port_name)
508                                 continue;
509 
510                         cd->port_dn[port_index] = port;
511 
512                         cd->port_names[port_index] = kstrdup(port_name,
513                                         GFP_KERNEL);
514                         if (!cd->port_names[port_index]) {
515                                 ret = -ENOMEM;
516                                 goto out_free_chip;
517                         }
518 
519                         ret = dsa_of_probe_links(pd, cd, chip_index,
520                                                  port_index, port, port_name);
521                         if (ret)
522                                 goto out_free_chip;
523 
524                 }
525         }
526 
527         /* The individual chips hold their own refcount on the mdio bus,
528          * so drop ours */
529         put_device(&mdio_bus->dev);
530 
531         return 0;
532 
533 out_free_chip:
534         dsa_of_free_platform_data(pd);
535 out_free:
536         kfree(pd);
537         dev->platform_data = NULL;
538 out_put_ethernet:
539         put_device(&ethernet_dev->dev);
540 out_put_mdio:
541         put_device(&mdio_bus->dev);
542         return ret;
543 }
544 
545 static void dsa_of_remove(struct device *dev)
546 {
547         struct dsa_platform_data *pd = dev->platform_data;
548 
549         if (!dev->of_node)
550                 return;
551 
552         dsa_of_free_platform_data(pd);
553         put_device(&pd->of_netdev->dev);
554         kfree(pd);
555 }
556 #else
557 static inline int dsa_of_probe(struct device *dev)
558 {
559         return 0;
560 }
561 
562 static inline void dsa_of_remove(struct device *dev)
563 {
564 }
565 #endif
566 
567 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
568                          struct device *parent, struct dsa_platform_data *pd)
569 {
570         int i;
571         unsigned configured = 0;
572 
573         dst->pd = pd;
574 
575         for (i = 0; i < pd->nr_chips; i++) {
576                 struct dsa_switch *ds;
577 
578                 ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
579                 if (IS_ERR(ds)) {
580                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
581                                    i, PTR_ERR(ds));
582                         continue;
583                 }
584 
585                 dst->ds[i] = ds;
586 
587                 ++configured;
588         }
589 
590         /*
591          * If no switch was found, exit cleanly
592          */
593         if (!configured)
594                 return -EPROBE_DEFER;
595 
596         return dsa_master_setup(dst->cpu_dp->master, dst->cpu_dp);
597 }
598 
599 static int dsa_probe(struct platform_device *pdev)
600 {
601         struct dsa_platform_data *pd = pdev->dev.platform_data;
602         struct net_device *dev;
603         struct dsa_switch_tree *dst;
604         int ret;
605 
606         if (pdev->dev.of_node) {
607                 ret = dsa_of_probe(&pdev->dev);
608                 if (ret)
609                         return ret;
610 
611                 pd = pdev->dev.platform_data;
612         }
613 
614         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
615                 return -EINVAL;
616 
617         if (pd->of_netdev) {
618                 dev = pd->of_netdev;
619                 dev_hold(dev);
620         } else {
621                 dev = dsa_dev_to_net_device(pd->netdev);
622         }
623         if (dev == NULL) {
624                 ret = -EPROBE_DEFER;
625                 goto out;
626         }
627 
628         if (dev->dsa_ptr != NULL) {
629                 dev_put(dev);
630                 ret = -EEXIST;
631                 goto out;
632         }
633 
634         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
635         if (dst == NULL) {
636                 dev_put(dev);
637                 ret = -ENOMEM;
638                 goto out;
639         }
640 
641         platform_set_drvdata(pdev, dst);
642 
643         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
644         if (ret) {
645                 dev_put(dev);
646                 goto out;
647         }
648 
649         return 0;
650 
651 out:
652         dsa_of_remove(&pdev->dev);
653 
654         return ret;
655 }
656 
657 static void dsa_remove_dst(struct dsa_switch_tree *dst)
658 {
659         int i;
660 
661         dsa_master_teardown(dst->cpu_dp->master);
662 
663         for (i = 0; i < dst->pd->nr_chips; i++) {
664                 struct dsa_switch *ds = dst->ds[i];
665 
666                 if (ds)
667                         dsa_switch_destroy(ds);
668         }
669 
670         dev_put(dst->cpu_dp->master);
671 }
672 
673 static int dsa_remove(struct platform_device *pdev)
674 {
675         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
676 
677         dsa_remove_dst(dst);
678         dsa_of_remove(&pdev->dev);
679 
680         return 0;
681 }
682 
683 static void dsa_shutdown(struct platform_device *pdev)
684 {
685 }
686 
687 #ifdef CONFIG_PM_SLEEP
688 static int dsa_suspend(struct device *d)
689 {
690         struct platform_device *pdev = to_platform_device(d);
691         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
692         int i, ret = 0;
693 
694         for (i = 0; i < dst->pd->nr_chips; i++) {
695                 struct dsa_switch *ds = dst->ds[i];
696 
697                 if (ds != NULL)
698                         ret = dsa_switch_suspend(ds);
699         }
700 
701         return ret;
702 }
703 
704 static int dsa_resume(struct device *d)
705 {
706         struct platform_device *pdev = to_platform_device(d);
707         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
708         int i, ret = 0;
709 
710         for (i = 0; i < dst->pd->nr_chips; i++) {
711                 struct dsa_switch *ds = dst->ds[i];
712 
713                 if (ds != NULL)
714                         ret = dsa_switch_resume(ds);
715         }
716 
717         return ret;
718 }
719 #endif
720 
721 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
722 
723 static const struct of_device_id dsa_of_match_table[] = {
724         { .compatible = "marvell,dsa", },
725         {}
726 };
727 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
728 
729 static struct platform_driver dsa_driver = {
730         .probe          = dsa_probe,
731         .remove         = dsa_remove,
732         .shutdown       = dsa_shutdown,
733         .driver = {
734                 .name   = "dsa",
735                 .of_match_table = dsa_of_match_table,
736                 .pm     = &dsa_pm_ops,
737         },
738 };
739 
740 int dsa_legacy_register(void)
741 {
742         return platform_driver_register(&dsa_driver);
743 }
744 
745 void dsa_legacy_unregister(void)
746 {
747         platform_driver_unregister(&dsa_driver);
748 }
749 

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