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a6a71f19 VD |
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 | #include <net/dsa.h> | |
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, struct device *dev) | |
82 | { | |
83 | struct dsa_port *dport; | |
84 | int ret, port; | |
85 | ||
86 | for (port = 0; port < ds->num_ports; port++) { | |
87 | if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))) | |
88 | continue; | |
89 | ||
90 | dport = &ds->ports[port]; | |
91 | ret = dsa_cpu_dsa_setup(ds, dev, dport, port); | |
92 | if (ret) | |
93 | return ret; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent) | |
99 | { | |
100 | const struct dsa_switch_ops *ops = ds->ops; | |
101 | struct dsa_switch_tree *dst = ds->dst; | |
102 | struct dsa_chip_data *cd = ds->cd; | |
103 | bool valid_name_found = false; | |
104 | int index = ds->index; | |
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 | name = cd->port_names[i]; | |
114 | if (name == NULL) | |
115 | continue; | |
116 | ||
117 | if (!strcmp(name, "cpu")) { | |
118 | if (dst->cpu_switch) { | |
119 | netdev_err(dst->master_netdev, | |
120 | "multiple cpu ports?!\n"); | |
121 | return -EINVAL; | |
122 | } | |
123 | dst->cpu_switch = ds; | |
124 | dst->cpu_port = i; | |
125 | ds->cpu_port_mask |= 1 << i; | |
126 | } else if (!strcmp(name, "dsa")) { | |
127 | ds->dsa_port_mask |= 1 << i; | |
128 | } else { | |
129 | ds->enabled_port_mask |= 1 << i; | |
130 | } | |
131 | valid_name_found = true; | |
132 | } | |
133 | ||
134 | if (!valid_name_found && i == ds->num_ports) | |
135 | return -EINVAL; | |
136 | ||
137 | /* Make the built-in MII bus mask match the number of ports, | |
138 | * switch drivers can override this later | |
139 | */ | |
140 | ds->phys_mii_mask = ds->enabled_port_mask; | |
141 | ||
142 | /* | |
143 | * If the CPU connects to this switch, set the switch tree | |
144 | * tagging protocol to the preferred tagging format of this | |
145 | * switch. | |
146 | */ | |
147 | if (dst->cpu_switch == ds) { | |
148 | enum dsa_tag_protocol tag_protocol; | |
149 | ||
150 | tag_protocol = ops->get_tag_protocol(ds); | |
151 | dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol); | |
152 | if (IS_ERR(dst->tag_ops)) | |
153 | return PTR_ERR(dst->tag_ops); | |
154 | ||
155 | dst->rcv = dst->tag_ops->rcv; | |
156 | } | |
157 | ||
158 | memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable)); | |
159 | ||
160 | /* | |
161 | * Do basic register setup. | |
162 | */ | |
163 | ret = ops->setup(ds); | |
164 | if (ret < 0) | |
165 | return ret; | |
166 | ||
167 | ret = dsa_switch_register_notifier(ds); | |
168 | if (ret) | |
169 | return ret; | |
170 | ||
171 | if (ops->set_addr) { | |
172 | ret = ops->set_addr(ds, dst->master_netdev->dev_addr); | |
173 | if (ret < 0) | |
174 | return ret; | |
175 | } | |
176 | ||
177 | if (!ds->slave_mii_bus && ops->phy_read) { | |
178 | ds->slave_mii_bus = devm_mdiobus_alloc(parent); | |
179 | if (!ds->slave_mii_bus) | |
180 | return -ENOMEM; | |
181 | dsa_slave_mii_bus_init(ds); | |
182 | ||
183 | ret = mdiobus_register(ds->slave_mii_bus); | |
184 | if (ret < 0) | |
185 | return ret; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Create network devices for physical switch ports. | |
190 | */ | |
191 | for (i = 0; i < ds->num_ports; i++) { | |
192 | ds->ports[i].dn = cd->port_dn[i]; | |
193 | ||
194 | if (!(ds->enabled_port_mask & (1 << i))) | |
195 | continue; | |
196 | ||
197 | ret = dsa_slave_create(ds, parent, i, cd->port_names[i]); | |
198 | if (ret < 0) | |
199 | netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n", | |
200 | index, i, cd->port_names[i], ret); | |
201 | } | |
202 | ||
203 | /* Perform configuration of the CPU and DSA ports */ | |
204 | ret = dsa_cpu_dsa_setups(ds, parent); | |
205 | if (ret < 0) | |
206 | netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n", | |
207 | index); | |
208 | ||
209 | ret = dsa_cpu_port_ethtool_setup(ds); | |
210 | if (ret) | |
211 | return ret; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static struct dsa_switch * | |
217 | dsa_switch_setup(struct dsa_switch_tree *dst, int index, | |
218 | struct device *parent, struct device *host_dev) | |
219 | { | |
220 | struct dsa_chip_data *cd = dst->pd->chip + index; | |
221 | const struct dsa_switch_ops *ops; | |
222 | struct dsa_switch *ds; | |
223 | int ret; | |
224 | const char *name; | |
225 | void *priv; | |
226 | ||
227 | /* | |
228 | * Probe for switch model. | |
229 | */ | |
230 | ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv); | |
231 | if (!ops) { | |
232 | netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n", | |
233 | index); | |
234 | return ERR_PTR(-EINVAL); | |
235 | } | |
236 | netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n", | |
237 | index, name); | |
238 | ||
239 | ||
240 | /* | |
241 | * Allocate and initialise switch state. | |
242 | */ | |
243 | ds = dsa_switch_alloc(parent, DSA_MAX_PORTS); | |
244 | if (!ds) | |
245 | return ERR_PTR(-ENOMEM); | |
246 | ||
247 | ds->dst = dst; | |
248 | ds->index = index; | |
249 | ds->cd = cd; | |
250 | ds->ops = ops; | |
251 | ds->priv = priv; | |
252 | ||
253 | ret = dsa_switch_setup_one(ds, parent); | |
254 | if (ret) | |
255 | return ERR_PTR(ret); | |
256 | ||
257 | return ds; | |
258 | } | |
259 | ||
260 | static void dsa_switch_destroy(struct dsa_switch *ds) | |
261 | { | |
262 | int port; | |
263 | ||
264 | /* Destroy network devices for physical switch ports. */ | |
265 | for (port = 0; port < ds->num_ports; port++) { | |
266 | if (!(ds->enabled_port_mask & (1 << port))) | |
267 | continue; | |
268 | ||
269 | if (!ds->ports[port].netdev) | |
270 | continue; | |
271 | ||
272 | dsa_slave_destroy(ds->ports[port].netdev); | |
273 | } | |
274 | ||
275 | /* Disable configuration of the CPU and DSA ports */ | |
276 | for (port = 0; port < ds->num_ports; port++) { | |
277 | if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))) | |
278 | continue; | |
279 | dsa_cpu_dsa_destroy(&ds->ports[port]); | |
280 | ||
281 | /* Clearing a bit which is not set does no harm */ | |
282 | ds->cpu_port_mask |= ~(1 << port); | |
283 | ds->dsa_port_mask |= ~(1 << port); | |
284 | } | |
285 | ||
286 | if (ds->slave_mii_bus && ds->ops->phy_read) | |
287 | mdiobus_unregister(ds->slave_mii_bus); | |
288 | ||
289 | dsa_switch_unregister_notifier(ds); | |
290 | } | |
291 | ||
292 | #ifdef CONFIG_PM_SLEEP | |
293 | int dsa_switch_suspend(struct dsa_switch *ds) | |
294 | { | |
295 | int i, ret = 0; | |
296 | ||
297 | /* Suspend slave network devices */ | |
298 | for (i = 0; i < ds->num_ports; i++) { | |
299 | if (!dsa_is_port_initialized(ds, i)) | |
300 | continue; | |
301 | ||
302 | ret = dsa_slave_suspend(ds->ports[i].netdev); | |
303 | if (ret) | |
304 | return ret; | |
305 | } | |
306 | ||
307 | if (ds->ops->suspend) | |
308 | ret = ds->ops->suspend(ds); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | EXPORT_SYMBOL_GPL(dsa_switch_suspend); | |
313 | ||
314 | int dsa_switch_resume(struct dsa_switch *ds) | |
315 | { | |
316 | int i, ret = 0; | |
317 | ||
318 | if (ds->ops->resume) | |
319 | ret = ds->ops->resume(ds); | |
320 | ||
321 | if (ret) | |
322 | return ret; | |
323 | ||
324 | /* Resume slave network devices */ | |
325 | for (i = 0; i < ds->num_ports; i++) { | |
326 | if (!dsa_is_port_initialized(ds, i)) | |
327 | continue; | |
328 | ||
329 | ret = dsa_slave_resume(ds->ports[i].netdev); | |
330 | if (ret) | |
331 | return ret; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(dsa_switch_resume); | |
337 | #endif | |
338 | ||
339 | /* platform driver init and cleanup *****************************************/ | |
340 | static int dev_is_class(struct device *dev, void *class) | |
341 | { | |
342 | if (dev->class != NULL && !strcmp(dev->class->name, class)) | |
343 | return 1; | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static struct device *dev_find_class(struct device *parent, char *class) | |
349 | { | |
350 | if (dev_is_class(parent, class)) { | |
351 | get_device(parent); | |
352 | return parent; | |
353 | } | |
354 | ||
355 | return device_find_child(parent, class, dev_is_class); | |
356 | } | |
357 | ||
358 | struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev) | |
359 | { | |
360 | struct device *d; | |
361 | ||
362 | d = dev_find_class(dev, "mdio_bus"); | |
363 | if (d != NULL) { | |
364 | struct mii_bus *bus; | |
365 | ||
366 | bus = to_mii_bus(d); | |
367 | put_device(d); | |
368 | ||
369 | return bus; | |
370 | } | |
371 | ||
372 | return NULL; | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus); | |
375 | ||
376 | #ifdef CONFIG_OF | |
377 | static int dsa_of_setup_routing_table(struct dsa_platform_data *pd, | |
378 | struct dsa_chip_data *cd, | |
379 | int chip_index, int port_index, | |
380 | struct device_node *link) | |
381 | { | |
382 | const __be32 *reg; | |
383 | int link_sw_addr; | |
384 | struct device_node *parent_sw; | |
385 | int len; | |
386 | ||
387 | parent_sw = of_get_parent(link); | |
388 | if (!parent_sw) | |
389 | return -EINVAL; | |
390 | ||
391 | reg = of_get_property(parent_sw, "reg", &len); | |
392 | if (!reg || (len != sizeof(*reg) * 2)) | |
393 | return -EINVAL; | |
394 | ||
395 | /* | |
396 | * Get the destination switch number from the second field of its 'reg' | |
397 | * property, i.e. for "reg = <0x19 1>" sw_addr is '1'. | |
398 | */ | |
399 | link_sw_addr = be32_to_cpup(reg + 1); | |
400 | ||
401 | if (link_sw_addr >= pd->nr_chips) | |
402 | return -EINVAL; | |
403 | ||
404 | cd->rtable[link_sw_addr] = port_index; | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static int dsa_of_probe_links(struct dsa_platform_data *pd, | |
410 | struct dsa_chip_data *cd, | |
411 | int chip_index, int port_index, | |
412 | struct device_node *port, | |
413 | const char *port_name) | |
414 | { | |
415 | struct device_node *link; | |
416 | int link_index; | |
417 | int ret; | |
418 | ||
419 | for (link_index = 0;; link_index++) { | |
420 | link = of_parse_phandle(port, "link", link_index); | |
421 | if (!link) | |
422 | break; | |
423 | ||
424 | if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) { | |
425 | ret = dsa_of_setup_routing_table(pd, cd, chip_index, | |
426 | port_index, link); | |
427 | if (ret) | |
428 | return ret; | |
429 | } | |
430 | } | |
431 | return 0; | |
432 | } | |
433 | ||
434 | static void dsa_of_free_platform_data(struct dsa_platform_data *pd) | |
435 | { | |
436 | int i; | |
437 | int port_index; | |
438 | ||
439 | for (i = 0; i < pd->nr_chips; i++) { | |
440 | port_index = 0; | |
441 | while (port_index < DSA_MAX_PORTS) { | |
442 | kfree(pd->chip[i].port_names[port_index]); | |
443 | port_index++; | |
444 | } | |
445 | ||
446 | /* Drop our reference to the MDIO bus device */ | |
447 | if (pd->chip[i].host_dev) | |
448 | put_device(pd->chip[i].host_dev); | |
449 | } | |
450 | kfree(pd->chip); | |
451 | } | |
452 | ||
453 | static int dsa_of_probe(struct device *dev) | |
454 | { | |
455 | struct device_node *np = dev->of_node; | |
456 | struct device_node *child, *mdio, *ethernet, *port; | |
457 | struct mii_bus *mdio_bus, *mdio_bus_switch; | |
458 | struct net_device *ethernet_dev; | |
459 | struct dsa_platform_data *pd; | |
460 | struct dsa_chip_data *cd; | |
461 | const char *port_name; | |
462 | int chip_index, port_index; | |
463 | const unsigned int *sw_addr, *port_reg; | |
464 | u32 eeprom_len; | |
465 | int ret; | |
466 | ||
467 | mdio = of_parse_phandle(np, "dsa,mii-bus", 0); | |
468 | if (!mdio) | |
469 | return -EINVAL; | |
470 | ||
471 | mdio_bus = of_mdio_find_bus(mdio); | |
472 | if (!mdio_bus) | |
473 | return -EPROBE_DEFER; | |
474 | ||
475 | ethernet = of_parse_phandle(np, "dsa,ethernet", 0); | |
476 | if (!ethernet) { | |
477 | ret = -EINVAL; | |
478 | goto out_put_mdio; | |
479 | } | |
480 | ||
481 | ethernet_dev = of_find_net_device_by_node(ethernet); | |
482 | if (!ethernet_dev) { | |
483 | ret = -EPROBE_DEFER; | |
484 | goto out_put_mdio; | |
485 | } | |
486 | ||
487 | pd = kzalloc(sizeof(*pd), GFP_KERNEL); | |
488 | if (!pd) { | |
489 | ret = -ENOMEM; | |
490 | goto out_put_ethernet; | |
491 | } | |
492 | ||
493 | dev->platform_data = pd; | |
494 | pd->of_netdev = ethernet_dev; | |
495 | pd->nr_chips = of_get_available_child_count(np); | |
496 | if (pd->nr_chips > DSA_MAX_SWITCHES) | |
497 | pd->nr_chips = DSA_MAX_SWITCHES; | |
498 | ||
499 | pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data), | |
500 | GFP_KERNEL); | |
501 | if (!pd->chip) { | |
502 | ret = -ENOMEM; | |
503 | goto out_free; | |
504 | } | |
505 | ||
506 | chip_index = -1; | |
507 | for_each_available_child_of_node(np, child) { | |
508 | int i; | |
509 | ||
510 | chip_index++; | |
511 | cd = &pd->chip[chip_index]; | |
512 | ||
513 | cd->of_node = child; | |
514 | ||
515 | /* Initialize the routing table */ | |
516 | for (i = 0; i < DSA_MAX_SWITCHES; ++i) | |
517 | cd->rtable[i] = DSA_RTABLE_NONE; | |
518 | ||
519 | /* When assigning the host device, increment its refcount */ | |
520 | cd->host_dev = get_device(&mdio_bus->dev); | |
521 | ||
522 | sw_addr = of_get_property(child, "reg", NULL); | |
523 | if (!sw_addr) | |
524 | continue; | |
525 | ||
526 | cd->sw_addr = be32_to_cpup(sw_addr); | |
527 | if (cd->sw_addr >= PHY_MAX_ADDR) | |
528 | continue; | |
529 | ||
530 | if (!of_property_read_u32(child, "eeprom-length", &eeprom_len)) | |
531 | cd->eeprom_len = eeprom_len; | |
532 | ||
533 | mdio = of_parse_phandle(child, "mii-bus", 0); | |
534 | if (mdio) { | |
535 | mdio_bus_switch = of_mdio_find_bus(mdio); | |
536 | if (!mdio_bus_switch) { | |
537 | ret = -EPROBE_DEFER; | |
538 | goto out_free_chip; | |
539 | } | |
540 | ||
541 | /* Drop the mdio_bus device ref, replacing the host | |
542 | * device with the mdio_bus_switch device, keeping | |
543 | * the refcount from of_mdio_find_bus() above. | |
544 | */ | |
545 | put_device(cd->host_dev); | |
546 | cd->host_dev = &mdio_bus_switch->dev; | |
547 | } | |
548 | ||
549 | for_each_available_child_of_node(child, port) { | |
550 | port_reg = of_get_property(port, "reg", NULL); | |
551 | if (!port_reg) | |
552 | continue; | |
553 | ||
554 | port_index = be32_to_cpup(port_reg); | |
555 | if (port_index >= DSA_MAX_PORTS) | |
556 | break; | |
557 | ||
558 | port_name = of_get_property(port, "label", NULL); | |
559 | if (!port_name) | |
560 | continue; | |
561 | ||
562 | cd->port_dn[port_index] = port; | |
563 | ||
564 | cd->port_names[port_index] = kstrdup(port_name, | |
565 | GFP_KERNEL); | |
566 | if (!cd->port_names[port_index]) { | |
567 | ret = -ENOMEM; | |
568 | goto out_free_chip; | |
569 | } | |
570 | ||
571 | ret = dsa_of_probe_links(pd, cd, chip_index, | |
572 | port_index, port, port_name); | |
573 | if (ret) | |
574 | goto out_free_chip; | |
575 | ||
576 | } | |
577 | } | |
578 | ||
579 | /* The individual chips hold their own refcount on the mdio bus, | |
580 | * so drop ours */ | |
581 | put_device(&mdio_bus->dev); | |
582 | ||
583 | return 0; | |
584 | ||
585 | out_free_chip: | |
586 | dsa_of_free_platform_data(pd); | |
587 | out_free: | |
588 | kfree(pd); | |
589 | dev->platform_data = NULL; | |
590 | out_put_ethernet: | |
591 | put_device(ðernet_dev->dev); | |
592 | out_put_mdio: | |
593 | put_device(&mdio_bus->dev); | |
594 | return ret; | |
595 | } | |
596 | ||
597 | static void dsa_of_remove(struct device *dev) | |
598 | { | |
599 | struct dsa_platform_data *pd = dev->platform_data; | |
600 | ||
601 | if (!dev->of_node) | |
602 | return; | |
603 | ||
604 | dsa_of_free_platform_data(pd); | |
605 | put_device(&pd->of_netdev->dev); | |
606 | kfree(pd); | |
607 | } | |
608 | #else | |
609 | static inline int dsa_of_probe(struct device *dev) | |
610 | { | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static inline void dsa_of_remove(struct device *dev) | |
615 | { | |
616 | } | |
617 | #endif | |
618 | ||
619 | static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev, | |
620 | struct device *parent, struct dsa_platform_data *pd) | |
621 | { | |
622 | int i; | |
623 | unsigned configured = 0; | |
624 | ||
625 | dst->pd = pd; | |
626 | dst->master_netdev = dev; | |
627 | dst->cpu_port = -1; | |
628 | ||
629 | for (i = 0; i < pd->nr_chips; i++) { | |
630 | struct dsa_switch *ds; | |
631 | ||
632 | ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev); | |
633 | if (IS_ERR(ds)) { | |
634 | netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n", | |
635 | i, PTR_ERR(ds)); | |
636 | continue; | |
637 | } | |
638 | ||
639 | dst->ds[i] = ds; | |
640 | ||
641 | ++configured; | |
642 | } | |
643 | ||
644 | /* | |
645 | * If no switch was found, exit cleanly | |
646 | */ | |
647 | if (!configured) | |
648 | return -EPROBE_DEFER; | |
649 | ||
650 | /* | |
651 | * If we use a tagging format that doesn't have an ethertype | |
652 | * field, make sure that all packets from this point on get | |
653 | * sent to the tag format's receive function. | |
654 | */ | |
655 | wmb(); | |
656 | dev->dsa_ptr = (void *)dst; | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | static int dsa_probe(struct platform_device *pdev) | |
662 | { | |
663 | struct dsa_platform_data *pd = pdev->dev.platform_data; | |
664 | struct net_device *dev; | |
665 | struct dsa_switch_tree *dst; | |
666 | int ret; | |
667 | ||
668 | if (pdev->dev.of_node) { | |
669 | ret = dsa_of_probe(&pdev->dev); | |
670 | if (ret) | |
671 | return ret; | |
672 | ||
673 | pd = pdev->dev.platform_data; | |
674 | } | |
675 | ||
676 | if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL)) | |
677 | return -EINVAL; | |
678 | ||
679 | if (pd->of_netdev) { | |
680 | dev = pd->of_netdev; | |
681 | dev_hold(dev); | |
682 | } else { | |
683 | dev = dsa_dev_to_net_device(pd->netdev); | |
684 | } | |
685 | if (dev == NULL) { | |
686 | ret = -EPROBE_DEFER; | |
687 | goto out; | |
688 | } | |
689 | ||
690 | if (dev->dsa_ptr != NULL) { | |
691 | dev_put(dev); | |
692 | ret = -EEXIST; | |
693 | goto out; | |
694 | } | |
695 | ||
696 | dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL); | |
697 | if (dst == NULL) { | |
698 | dev_put(dev); | |
699 | ret = -ENOMEM; | |
700 | goto out; | |
701 | } | |
702 | ||
703 | platform_set_drvdata(pdev, dst); | |
704 | ||
705 | ret = dsa_setup_dst(dst, dev, &pdev->dev, pd); | |
706 | if (ret) { | |
707 | dev_put(dev); | |
708 | goto out; | |
709 | } | |
710 | ||
711 | return 0; | |
712 | ||
713 | out: | |
714 | dsa_of_remove(&pdev->dev); | |
715 | ||
716 | return ret; | |
717 | } | |
718 | ||
719 | static void dsa_remove_dst(struct dsa_switch_tree *dst) | |
720 | { | |
721 | int i; | |
722 | ||
723 | dst->master_netdev->dsa_ptr = NULL; | |
724 | ||
725 | /* If we used a tagging format that doesn't have an ethertype | |
726 | * field, make sure that all packets from this point get sent | |
727 | * without the tag and go through the regular receive path. | |
728 | */ | |
729 | wmb(); | |
730 | ||
731 | for (i = 0; i < dst->pd->nr_chips; i++) { | |
732 | struct dsa_switch *ds = dst->ds[i]; | |
733 | ||
734 | if (ds) | |
735 | dsa_switch_destroy(ds); | |
736 | } | |
737 | ||
738 | dsa_cpu_port_ethtool_restore(dst->cpu_switch); | |
739 | ||
740 | dev_put(dst->master_netdev); | |
741 | } | |
742 | ||
743 | static int dsa_remove(struct platform_device *pdev) | |
744 | { | |
745 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); | |
746 | ||
747 | dsa_remove_dst(dst); | |
748 | dsa_of_remove(&pdev->dev); | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | static void dsa_shutdown(struct platform_device *pdev) | |
754 | { | |
755 | } | |
756 | ||
757 | #ifdef CONFIG_PM_SLEEP | |
758 | static int dsa_suspend(struct device *d) | |
759 | { | |
760 | struct platform_device *pdev = to_platform_device(d); | |
761 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); | |
762 | int i, ret = 0; | |
763 | ||
764 | for (i = 0; i < dst->pd->nr_chips; i++) { | |
765 | struct dsa_switch *ds = dst->ds[i]; | |
766 | ||
767 | if (ds != NULL) | |
768 | ret = dsa_switch_suspend(ds); | |
769 | } | |
770 | ||
771 | return ret; | |
772 | } | |
773 | ||
774 | static int dsa_resume(struct device *d) | |
775 | { | |
776 | struct platform_device *pdev = to_platform_device(d); | |
777 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); | |
778 | int i, ret = 0; | |
779 | ||
780 | for (i = 0; i < dst->pd->nr_chips; i++) { | |
781 | struct dsa_switch *ds = dst->ds[i]; | |
782 | ||
783 | if (ds != NULL) | |
784 | ret = dsa_switch_resume(ds); | |
785 | } | |
786 | ||
787 | return ret; | |
788 | } | |
789 | #endif | |
790 | ||
791 | static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume); | |
792 | ||
793 | static const struct of_device_id dsa_of_match_table[] = { | |
794 | { .compatible = "marvell,dsa", }, | |
795 | {} | |
796 | }; | |
797 | MODULE_DEVICE_TABLE(of, dsa_of_match_table); | |
798 | ||
799 | static struct platform_driver dsa_driver = { | |
800 | .probe = dsa_probe, | |
801 | .remove = dsa_remove, | |
802 | .shutdown = dsa_shutdown, | |
803 | .driver = { | |
804 | .name = "dsa", | |
805 | .of_match_table = dsa_of_match_table, | |
806 | .pm = &dsa_pm_ops, | |
807 | }, | |
808 | }; | |
809 | ||
810 | int dsa_legacy_register(void) | |
811 | { | |
812 | return platform_driver_register(&dsa_driver); | |
813 | } | |
814 | ||
815 | void dsa_legacy_unregister(void) | |
816 | { | |
817 | platform_driver_unregister(&dsa_driver); | |
818 | } |