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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 | ||
a6a71f19 VD |
292 | /* platform driver init and cleanup *****************************************/ |
293 | static int dev_is_class(struct device *dev, void *class) | |
294 | { | |
295 | if (dev->class != NULL && !strcmp(dev->class->name, class)) | |
296 | return 1; | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static struct device *dev_find_class(struct device *parent, char *class) | |
302 | { | |
303 | if (dev_is_class(parent, class)) { | |
304 | get_device(parent); | |
305 | return parent; | |
306 | } | |
307 | ||
308 | return device_find_child(parent, class, dev_is_class); | |
309 | } | |
310 | ||
311 | struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev) | |
312 | { | |
313 | struct device *d; | |
314 | ||
315 | d = dev_find_class(dev, "mdio_bus"); | |
316 | if (d != NULL) { | |
317 | struct mii_bus *bus; | |
318 | ||
319 | bus = to_mii_bus(d); | |
320 | put_device(d); | |
321 | ||
322 | return bus; | |
323 | } | |
324 | ||
325 | return NULL; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus); | |
328 | ||
329 | #ifdef CONFIG_OF | |
330 | static int dsa_of_setup_routing_table(struct dsa_platform_data *pd, | |
331 | struct dsa_chip_data *cd, | |
332 | int chip_index, int port_index, | |
333 | struct device_node *link) | |
334 | { | |
335 | const __be32 *reg; | |
336 | int link_sw_addr; | |
337 | struct device_node *parent_sw; | |
338 | int len; | |
339 | ||
340 | parent_sw = of_get_parent(link); | |
341 | if (!parent_sw) | |
342 | return -EINVAL; | |
343 | ||
344 | reg = of_get_property(parent_sw, "reg", &len); | |
345 | if (!reg || (len != sizeof(*reg) * 2)) | |
346 | return -EINVAL; | |
347 | ||
348 | /* | |
349 | * Get the destination switch number from the second field of its 'reg' | |
350 | * property, i.e. for "reg = <0x19 1>" sw_addr is '1'. | |
351 | */ | |
352 | link_sw_addr = be32_to_cpup(reg + 1); | |
353 | ||
354 | if (link_sw_addr >= pd->nr_chips) | |
355 | return -EINVAL; | |
356 | ||
357 | cd->rtable[link_sw_addr] = port_index; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int dsa_of_probe_links(struct dsa_platform_data *pd, | |
363 | struct dsa_chip_data *cd, | |
364 | int chip_index, int port_index, | |
365 | struct device_node *port, | |
366 | const char *port_name) | |
367 | { | |
368 | struct device_node *link; | |
369 | int link_index; | |
370 | int ret; | |
371 | ||
372 | for (link_index = 0;; link_index++) { | |
373 | link = of_parse_phandle(port, "link", link_index); | |
374 | if (!link) | |
375 | break; | |
376 | ||
377 | if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) { | |
378 | ret = dsa_of_setup_routing_table(pd, cd, chip_index, | |
379 | port_index, link); | |
380 | if (ret) | |
381 | return ret; | |
382 | } | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static void dsa_of_free_platform_data(struct dsa_platform_data *pd) | |
388 | { | |
389 | int i; | |
390 | int port_index; | |
391 | ||
392 | for (i = 0; i < pd->nr_chips; i++) { | |
393 | port_index = 0; | |
394 | while (port_index < DSA_MAX_PORTS) { | |
395 | kfree(pd->chip[i].port_names[port_index]); | |
396 | port_index++; | |
397 | } | |
398 | ||
399 | /* Drop our reference to the MDIO bus device */ | |
400 | if (pd->chip[i].host_dev) | |
401 | put_device(pd->chip[i].host_dev); | |
402 | } | |
403 | kfree(pd->chip); | |
404 | } | |
405 | ||
406 | static int dsa_of_probe(struct device *dev) | |
407 | { | |
408 | struct device_node *np = dev->of_node; | |
409 | struct device_node *child, *mdio, *ethernet, *port; | |
410 | struct mii_bus *mdio_bus, *mdio_bus_switch; | |
411 | struct net_device *ethernet_dev; | |
412 | struct dsa_platform_data *pd; | |
413 | struct dsa_chip_data *cd; | |
414 | const char *port_name; | |
415 | int chip_index, port_index; | |
416 | const unsigned int *sw_addr, *port_reg; | |
417 | u32 eeprom_len; | |
418 | int ret; | |
419 | ||
420 | mdio = of_parse_phandle(np, "dsa,mii-bus", 0); | |
421 | if (!mdio) | |
422 | return -EINVAL; | |
423 | ||
424 | mdio_bus = of_mdio_find_bus(mdio); | |
425 | if (!mdio_bus) | |
426 | return -EPROBE_DEFER; | |
427 | ||
428 | ethernet = of_parse_phandle(np, "dsa,ethernet", 0); | |
429 | if (!ethernet) { | |
430 | ret = -EINVAL; | |
431 | goto out_put_mdio; | |
432 | } | |
433 | ||
434 | ethernet_dev = of_find_net_device_by_node(ethernet); | |
435 | if (!ethernet_dev) { | |
436 | ret = -EPROBE_DEFER; | |
437 | goto out_put_mdio; | |
438 | } | |
439 | ||
440 | pd = kzalloc(sizeof(*pd), GFP_KERNEL); | |
441 | if (!pd) { | |
442 | ret = -ENOMEM; | |
443 | goto out_put_ethernet; | |
444 | } | |
445 | ||
446 | dev->platform_data = pd; | |
447 | pd->of_netdev = ethernet_dev; | |
448 | pd->nr_chips = of_get_available_child_count(np); | |
449 | if (pd->nr_chips > DSA_MAX_SWITCHES) | |
450 | pd->nr_chips = DSA_MAX_SWITCHES; | |
451 | ||
452 | pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data), | |
453 | GFP_KERNEL); | |
454 | if (!pd->chip) { | |
455 | ret = -ENOMEM; | |
456 | goto out_free; | |
457 | } | |
458 | ||
459 | chip_index = -1; | |
460 | for_each_available_child_of_node(np, child) { | |
461 | int i; | |
462 | ||
463 | chip_index++; | |
464 | cd = &pd->chip[chip_index]; | |
465 | ||
466 | cd->of_node = child; | |
467 | ||
468 | /* Initialize the routing table */ | |
469 | for (i = 0; i < DSA_MAX_SWITCHES; ++i) | |
470 | cd->rtable[i] = DSA_RTABLE_NONE; | |
471 | ||
472 | /* When assigning the host device, increment its refcount */ | |
473 | cd->host_dev = get_device(&mdio_bus->dev); | |
474 | ||
475 | sw_addr = of_get_property(child, "reg", NULL); | |
476 | if (!sw_addr) | |
477 | continue; | |
478 | ||
479 | cd->sw_addr = be32_to_cpup(sw_addr); | |
480 | if (cd->sw_addr >= PHY_MAX_ADDR) | |
481 | continue; | |
482 | ||
483 | if (!of_property_read_u32(child, "eeprom-length", &eeprom_len)) | |
484 | cd->eeprom_len = eeprom_len; | |
485 | ||
486 | mdio = of_parse_phandle(child, "mii-bus", 0); | |
487 | if (mdio) { | |
488 | mdio_bus_switch = of_mdio_find_bus(mdio); | |
489 | if (!mdio_bus_switch) { | |
490 | ret = -EPROBE_DEFER; | |
491 | goto out_free_chip; | |
492 | } | |
493 | ||
494 | /* Drop the mdio_bus device ref, replacing the host | |
495 | * device with the mdio_bus_switch device, keeping | |
496 | * the refcount from of_mdio_find_bus() above. | |
497 | */ | |
498 | put_device(cd->host_dev); | |
499 | cd->host_dev = &mdio_bus_switch->dev; | |
500 | } | |
501 | ||
502 | for_each_available_child_of_node(child, port) { | |
503 | port_reg = of_get_property(port, "reg", NULL); | |
504 | if (!port_reg) | |
505 | continue; | |
506 | ||
507 | port_index = be32_to_cpup(port_reg); | |
508 | if (port_index >= DSA_MAX_PORTS) | |
509 | break; | |
510 | ||
511 | port_name = of_get_property(port, "label", NULL); | |
512 | if (!port_name) | |
513 | continue; | |
514 | ||
515 | cd->port_dn[port_index] = port; | |
516 | ||
517 | cd->port_names[port_index] = kstrdup(port_name, | |
518 | GFP_KERNEL); | |
519 | if (!cd->port_names[port_index]) { | |
520 | ret = -ENOMEM; | |
521 | goto out_free_chip; | |
522 | } | |
523 | ||
524 | ret = dsa_of_probe_links(pd, cd, chip_index, | |
525 | port_index, port, port_name); | |
526 | if (ret) | |
527 | goto out_free_chip; | |
528 | ||
529 | } | |
530 | } | |
531 | ||
532 | /* The individual chips hold their own refcount on the mdio bus, | |
533 | * so drop ours */ | |
534 | put_device(&mdio_bus->dev); | |
535 | ||
536 | return 0; | |
537 | ||
538 | out_free_chip: | |
539 | dsa_of_free_platform_data(pd); | |
540 | out_free: | |
541 | kfree(pd); | |
542 | dev->platform_data = NULL; | |
543 | out_put_ethernet: | |
544 | put_device(ðernet_dev->dev); | |
545 | out_put_mdio: | |
546 | put_device(&mdio_bus->dev); | |
547 | return ret; | |
548 | } | |
549 | ||
550 | static void dsa_of_remove(struct device *dev) | |
551 | { | |
552 | struct dsa_platform_data *pd = dev->platform_data; | |
553 | ||
554 | if (!dev->of_node) | |
555 | return; | |
556 | ||
557 | dsa_of_free_platform_data(pd); | |
558 | put_device(&pd->of_netdev->dev); | |
559 | kfree(pd); | |
560 | } | |
561 | #else | |
562 | static inline int dsa_of_probe(struct device *dev) | |
563 | { | |
564 | return 0; | |
565 | } | |
566 | ||
567 | static inline void dsa_of_remove(struct device *dev) | |
568 | { | |
569 | } | |
570 | #endif | |
571 | ||
572 | static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev, | |
573 | struct device *parent, struct dsa_platform_data *pd) | |
574 | { | |
575 | int i; | |
576 | unsigned configured = 0; | |
577 | ||
578 | dst->pd = pd; | |
579 | dst->master_netdev = dev; | |
580 | dst->cpu_port = -1; | |
581 | ||
582 | for (i = 0; i < pd->nr_chips; i++) { | |
583 | struct dsa_switch *ds; | |
584 | ||
585 | ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev); | |
586 | if (IS_ERR(ds)) { | |
587 | netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n", | |
588 | i, PTR_ERR(ds)); | |
589 | continue; | |
590 | } | |
591 | ||
592 | dst->ds[i] = ds; | |
593 | ||
594 | ++configured; | |
595 | } | |
596 | ||
597 | /* | |
598 | * If no switch was found, exit cleanly | |
599 | */ | |
600 | if (!configured) | |
601 | return -EPROBE_DEFER; | |
602 | ||
603 | /* | |
604 | * If we use a tagging format that doesn't have an ethertype | |
605 | * field, make sure that all packets from this point on get | |
606 | * sent to the tag format's receive function. | |
607 | */ | |
608 | wmb(); | |
609 | dev->dsa_ptr = (void *)dst; | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | static int dsa_probe(struct platform_device *pdev) | |
615 | { | |
616 | struct dsa_platform_data *pd = pdev->dev.platform_data; | |
617 | struct net_device *dev; | |
618 | struct dsa_switch_tree *dst; | |
619 | int ret; | |
620 | ||
621 | if (pdev->dev.of_node) { | |
622 | ret = dsa_of_probe(&pdev->dev); | |
623 | if (ret) | |
624 | return ret; | |
625 | ||
626 | pd = pdev->dev.platform_data; | |
627 | } | |
628 | ||
629 | if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL)) | |
630 | return -EINVAL; | |
631 | ||
632 | if (pd->of_netdev) { | |
633 | dev = pd->of_netdev; | |
634 | dev_hold(dev); | |
635 | } else { | |
636 | dev = dsa_dev_to_net_device(pd->netdev); | |
637 | } | |
638 | if (dev == NULL) { | |
639 | ret = -EPROBE_DEFER; | |
640 | goto out; | |
641 | } | |
642 | ||
643 | if (dev->dsa_ptr != NULL) { | |
644 | dev_put(dev); | |
645 | ret = -EEXIST; | |
646 | goto out; | |
647 | } | |
648 | ||
649 | dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL); | |
650 | if (dst == NULL) { | |
651 | dev_put(dev); | |
652 | ret = -ENOMEM; | |
653 | goto out; | |
654 | } | |
655 | ||
656 | platform_set_drvdata(pdev, dst); | |
657 | ||
658 | ret = dsa_setup_dst(dst, dev, &pdev->dev, pd); | |
659 | if (ret) { | |
660 | dev_put(dev); | |
661 | goto out; | |
662 | } | |
663 | ||
664 | return 0; | |
665 | ||
666 | out: | |
667 | dsa_of_remove(&pdev->dev); | |
668 | ||
669 | return ret; | |
670 | } | |
671 | ||
672 | static void dsa_remove_dst(struct dsa_switch_tree *dst) | |
673 | { | |
674 | int i; | |
675 | ||
676 | dst->master_netdev->dsa_ptr = NULL; | |
677 | ||
678 | /* If we used a tagging format that doesn't have an ethertype | |
679 | * field, make sure that all packets from this point get sent | |
680 | * without the tag and go through the regular receive path. | |
681 | */ | |
682 | wmb(); | |
683 | ||
684 | for (i = 0; i < dst->pd->nr_chips; i++) { | |
685 | struct dsa_switch *ds = dst->ds[i]; | |
686 | ||
687 | if (ds) | |
688 | dsa_switch_destroy(ds); | |
689 | } | |
690 | ||
691 | dsa_cpu_port_ethtool_restore(dst->cpu_switch); | |
692 | ||
693 | dev_put(dst->master_netdev); | |
694 | } | |
695 | ||
696 | static int dsa_remove(struct platform_device *pdev) | |
697 | { | |
698 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); | |
699 | ||
700 | dsa_remove_dst(dst); | |
701 | dsa_of_remove(&pdev->dev); | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | static void dsa_shutdown(struct platform_device *pdev) | |
707 | { | |
708 | } | |
709 | ||
710 | #ifdef CONFIG_PM_SLEEP | |
711 | static int dsa_suspend(struct device *d) | |
712 | { | |
713 | struct platform_device *pdev = to_platform_device(d); | |
714 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); | |
715 | int i, ret = 0; | |
716 | ||
717 | for (i = 0; i < dst->pd->nr_chips; i++) { | |
718 | struct dsa_switch *ds = dst->ds[i]; | |
719 | ||
720 | if (ds != NULL) | |
721 | ret = dsa_switch_suspend(ds); | |
722 | } | |
723 | ||
724 | return ret; | |
725 | } | |
726 | ||
727 | static int dsa_resume(struct device *d) | |
728 | { | |
729 | struct platform_device *pdev = to_platform_device(d); | |
730 | struct dsa_switch_tree *dst = platform_get_drvdata(pdev); | |
731 | int i, ret = 0; | |
732 | ||
733 | for (i = 0; i < dst->pd->nr_chips; i++) { | |
734 | struct dsa_switch *ds = dst->ds[i]; | |
735 | ||
736 | if (ds != NULL) | |
737 | ret = dsa_switch_resume(ds); | |
738 | } | |
739 | ||
740 | return ret; | |
741 | } | |
742 | #endif | |
743 | ||
744 | static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume); | |
745 | ||
746 | static const struct of_device_id dsa_of_match_table[] = { | |
747 | { .compatible = "marvell,dsa", }, | |
748 | {} | |
749 | }; | |
750 | MODULE_DEVICE_TABLE(of, dsa_of_match_table); | |
751 | ||
752 | static struct platform_driver dsa_driver = { | |
753 | .probe = dsa_probe, | |
754 | .remove = dsa_remove, | |
755 | .shutdown = dsa_shutdown, | |
756 | .driver = { | |
757 | .name = "dsa", | |
758 | .of_match_table = dsa_of_match_table, | |
759 | .pm = &dsa_pm_ops, | |
760 | }, | |
761 | }; | |
762 | ||
763 | int dsa_legacy_register(void) | |
764 | { | |
765 | return platform_driver_register(&dsa_driver); | |
766 | } | |
767 | ||
768 | void dsa_legacy_unregister(void) | |
769 | { | |
770 | platform_driver_unregister(&dsa_driver); | |
771 | } |