Commit | Line | Data |
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02d320c3 | 1 | /* MDIO Bus interface |
00db8189 AF |
2 | * |
3 | * Author: Andy Fleming | |
4 | * | |
5 | * Copyright (c) 2004 Freescale Semiconductor, Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | */ | |
8d242488 JP |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
00db8189 | 16 | #include <linux/kernel.h> |
00db8189 AF |
17 | #include <linux/string.h> |
18 | #include <linux/errno.h> | |
19 | #include <linux/unistd.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/delay.h> | |
3d1e4db2 | 24 | #include <linux/device.h> |
a30e2c18 | 25 | #include <linux/of_device.h> |
4085a7f0 | 26 | #include <linux/of_mdio.h> |
00db8189 AF |
27 | #include <linux/netdevice.h> |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/module.h> | |
00db8189 AF |
33 | #include <linux/mii.h> |
34 | #include <linux/ethtool.h> | |
35 | #include <linux/phy.h> | |
02d320c3 SS |
36 | #include <linux/io.h> |
37 | #include <linux/uaccess.h> | |
00db8189 | 38 | |
00db8189 | 39 | #include <asm/irq.h> |
00db8189 | 40 | |
7f854420 AL |
41 | int mdiobus_register_device(struct mdio_device *mdiodev) |
42 | { | |
43 | if (mdiodev->bus->mdio_map[mdiodev->addr]) | |
44 | return -EBUSY; | |
45 | ||
46 | mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev; | |
47 | ||
48 | return 0; | |
49 | } | |
50 | EXPORT_SYMBOL(mdiobus_register_device); | |
51 | ||
52 | int mdiobus_unregister_device(struct mdio_device *mdiodev) | |
53 | { | |
54 | if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev) | |
55 | return -EINVAL; | |
56 | ||
57 | mdiodev->bus->mdio_map[mdiodev->addr] = NULL; | |
58 | ||
59 | return 0; | |
60 | } | |
61 | EXPORT_SYMBOL(mdiobus_unregister_device); | |
62 | ||
63 | struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr) | |
64 | { | |
65 | struct mdio_device *mdiodev = bus->mdio_map[addr]; | |
66 | ||
67 | if (!mdiodev) | |
68 | return NULL; | |
69 | ||
70 | if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY)) | |
71 | return NULL; | |
72 | ||
73 | return container_of(mdiodev, struct phy_device, mdio); | |
74 | } | |
75 | EXPORT_SYMBOL(mdiobus_get_phy); | |
76 | ||
77 | bool mdiobus_is_registered_device(struct mii_bus *bus, int addr) | |
78 | { | |
79 | return bus->mdio_map[addr]; | |
80 | } | |
81 | EXPORT_SYMBOL(mdiobus_is_registered_device); | |
82 | ||
298cf9be | 83 | /** |
eb8a54a7 | 84 | * mdiobus_alloc_size - allocate a mii_bus structure |
af58f1d6 RD |
85 | * @size: extra amount of memory to allocate for private storage. |
86 | * If non-zero, then bus->priv is points to that memory. | |
298cf9be LB |
87 | * |
88 | * Description: called by a bus driver to allocate an mii_bus | |
89 | * structure to fill in. | |
90 | */ | |
eb8a54a7 | 91 | struct mii_bus *mdiobus_alloc_size(size_t size) |
298cf9be | 92 | { |
46abc021 | 93 | struct mii_bus *bus; |
eb8a54a7 TT |
94 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
95 | size_t alloc_size; | |
e7f4dc35 | 96 | int i; |
eb8a54a7 TT |
97 | |
98 | /* If we alloc extra space, it should be aligned */ | |
99 | if (size) | |
100 | alloc_size = aligned_size + size; | |
101 | else | |
102 | alloc_size = sizeof(*bus); | |
46abc021 | 103 | |
eb8a54a7 TT |
104 | bus = kzalloc(alloc_size, GFP_KERNEL); |
105 | if (bus) { | |
46abc021 | 106 | bus->state = MDIOBUS_ALLOCATED; |
eb8a54a7 TT |
107 | if (size) |
108 | bus->priv = (void *)bus + aligned_size; | |
109 | } | |
46abc021 | 110 | |
e7f4dc35 AL |
111 | /* Initialise the interrupts to polling */ |
112 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
113 | bus->irq[i] = PHY_POLL; | |
114 | ||
46abc021 | 115 | return bus; |
298cf9be | 116 | } |
eb8a54a7 | 117 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 118 | |
6d48f44b GS |
119 | static void _devm_mdiobus_free(struct device *dev, void *res) |
120 | { | |
121 | mdiobus_free(*(struct mii_bus **)res); | |
122 | } | |
123 | ||
124 | static int devm_mdiobus_match(struct device *dev, void *res, void *data) | |
125 | { | |
126 | struct mii_bus **r = res; | |
127 | ||
128 | if (WARN_ON(!r || !*r)) | |
129 | return 0; | |
130 | ||
131 | return *r == data; | |
132 | } | |
133 | ||
134 | /** | |
135 | * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size() | |
136 | * @dev: Device to allocate mii_bus for | |
137 | * @sizeof_priv: Space to allocate for private structure. | |
138 | * | |
139 | * Managed mdiobus_alloc_size. mii_bus allocated with this function is | |
140 | * automatically freed on driver detach. | |
141 | * | |
142 | * If an mii_bus allocated with this function needs to be freed separately, | |
143 | * devm_mdiobus_free() must be used. | |
144 | * | |
145 | * RETURNS: | |
146 | * Pointer to allocated mii_bus on success, NULL on failure. | |
147 | */ | |
148 | struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv) | |
149 | { | |
150 | struct mii_bus **ptr, *bus; | |
151 | ||
152 | ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL); | |
153 | if (!ptr) | |
154 | return NULL; | |
155 | ||
156 | /* use raw alloc_dr for kmalloc caller tracing */ | |
157 | bus = mdiobus_alloc_size(sizeof_priv); | |
158 | if (bus) { | |
159 | *ptr = bus; | |
160 | devres_add(dev, ptr); | |
161 | } else { | |
162 | devres_free(ptr); | |
163 | } | |
164 | ||
165 | return bus; | |
166 | } | |
93dccc59 | 167 | EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size); |
6d48f44b GS |
168 | |
169 | /** | |
170 | * devm_mdiobus_free - Resource-managed mdiobus_free() | |
171 | * @dev: Device this mii_bus belongs to | |
172 | * @bus: the mii_bus associated with the device | |
173 | * | |
174 | * Free mii_bus allocated with devm_mdiobus_alloc_size(). | |
175 | */ | |
176 | void devm_mdiobus_free(struct device *dev, struct mii_bus *bus) | |
177 | { | |
178 | int rc; | |
179 | ||
180 | rc = devres_release(dev, _devm_mdiobus_free, | |
181 | devm_mdiobus_match, bus); | |
182 | WARN_ON(rc); | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(devm_mdiobus_free); | |
185 | ||
46abc021 LB |
186 | /** |
187 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 188 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
189 | * |
190 | * Description: called when the last reference to an mii_bus is | |
191 | * dropped, to free the underlying memory. | |
192 | */ | |
193 | static void mdiobus_release(struct device *d) | |
194 | { | |
195 | struct mii_bus *bus = to_mii_bus(d); | |
161c8d2f KH |
196 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
197 | /* for compatibility with error handling in drivers */ | |
198 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
199 | kfree(bus); |
200 | } | |
201 | ||
202 | static struct class mdio_bus_class = { | |
203 | .name = "mdio_bus", | |
204 | .dev_release = mdiobus_release, | |
205 | }; | |
206 | ||
b943fbb0 | 207 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 | 208 | /* Helper function for of_mdio_find_bus */ |
9f3b795a | 209 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
25106022 DD |
210 | { |
211 | return dev->of_node == mdio_bus_np; | |
212 | } | |
213 | /** | |
214 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 215 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 | 216 | * |
a1364421 RK |
217 | * Returns a reference to the mii_bus, or NULL if none found. The |
218 | * embedded struct device will have its reference count incremented, | |
219 | * and this must be put once the bus is finished with. | |
25106022 DD |
220 | * |
221 | * Because the association of a device_node and mii_bus is made via | |
222 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
223 | * registered with of_mdiobus_register(). | |
224 | * | |
225 | */ | |
226 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
227 | { | |
228 | struct device *d; | |
229 | ||
230 | if (!mdio_bus_np) | |
231 | return NULL; | |
232 | ||
233 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, | |
234 | of_mdio_bus_match); | |
235 | ||
236 | return d ? to_mii_bus(d) : NULL; | |
237 | } | |
238 | EXPORT_SYMBOL(of_mdio_find_bus); | |
d9daa247 | 239 | |
f03bc4ae AL |
240 | /* Walk the list of subnodes of a mdio bus and look for a node that |
241 | * matches the mdio device's address with its 'reg' property. If | |
242 | * found, set the of_node pointer for the mdio device. This allows | |
243 | * auto-probed phy devices to be supplied with information passed in | |
244 | * via DT. | |
d9daa247 | 245 | */ |
f03bc4ae AL |
246 | static void of_mdiobus_link_mdiodev(struct mii_bus *bus, |
247 | struct mdio_device *mdiodev) | |
d9daa247 | 248 | { |
f03bc4ae | 249 | struct device *dev = &mdiodev->dev; |
d9daa247 DM |
250 | struct device_node *child; |
251 | ||
e5a03bfd | 252 | if (dev->of_node || !bus->dev.of_node) |
d9daa247 DM |
253 | return; |
254 | ||
e5a03bfd | 255 | for_each_available_child_of_node(bus->dev.of_node, child) { |
d9daa247 DM |
256 | int addr; |
257 | int ret; | |
258 | ||
259 | ret = of_property_read_u32(child, "reg", &addr); | |
260 | if (ret < 0) { | |
f03bc4ae | 261 | dev_err(dev, "%s has invalid MDIO address\n", |
d9daa247 DM |
262 | child->full_name); |
263 | continue; | |
264 | } | |
265 | ||
f03bc4ae | 266 | /* A MDIO device must have a reg property in the range [0-31] */ |
d9daa247 | 267 | if (addr >= PHY_MAX_ADDR) { |
f03bc4ae | 268 | dev_err(dev, "%s MDIO address %i is too large\n", |
d9daa247 DM |
269 | child->full_name, addr); |
270 | continue; | |
271 | } | |
272 | ||
f03bc4ae | 273 | if (addr == mdiodev->addr) { |
d9daa247 DM |
274 | dev->of_node = child; |
275 | return; | |
276 | } | |
277 | } | |
278 | } | |
279 | #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ | |
f03bc4ae AL |
280 | static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
281 | struct mdio_device *mdiodev) | |
d9daa247 DM |
282 | { |
283 | } | |
25106022 DD |
284 | #endif |
285 | ||
b3df0da8 | 286 | /** |
59f06978 | 287 | * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
b3df0da8 | 288 | * @bus: target mii_bus |
59f06978 | 289 | * @owner: module containing bus accessor functions |
e1393456 | 290 | * |
b3df0da8 | 291 | * Description: Called by a bus driver to bring up all the PHYs |
59f06978 RK |
292 | * on a given bus, and attach them to the bus. Drivers should use |
293 | * mdiobus_register() rather than __mdiobus_register() unless they | |
294 | * need to pass a specific owner module. | |
b3df0da8 RD |
295 | * |
296 | * Returns 0 on success or < 0 on error. | |
e1393456 | 297 | */ |
3e3aaf64 | 298 | int __mdiobus_register(struct mii_bus *bus, struct module *owner) |
e1393456 | 299 | { |
161c8d2f | 300 | int i, err; |
e1393456 | 301 | |
e1393456 | 302 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 303 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
304 | return -EINVAL; |
305 | ||
46abc021 LB |
306 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
307 | bus->state != MDIOBUS_UNREGISTERED); | |
308 | ||
3e3aaf64 | 309 | bus->owner = owner; |
46abc021 LB |
310 | bus->dev.parent = bus->parent; |
311 | bus->dev.class = &mdio_bus_class; | |
312 | bus->dev.groups = NULL; | |
036b6687 | 313 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 LB |
314 | |
315 | err = device_register(&bus->dev); | |
316 | if (err) { | |
8d242488 | 317 | pr_err("mii_bus %s failed to register\n", bus->id); |
0c692d07 | 318 | put_device(&bus->dev); |
46abc021 LB |
319 | return -EINVAL; |
320 | } | |
321 | ||
d1e7fe4d AB |
322 | mutex_init(&bus->mdio_lock); |
323 | ||
e1393456 AF |
324 | if (bus->reset) |
325 | bus->reset(bus); | |
326 | ||
327 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
4fd5f812 LB |
328 | if ((bus->phy_mask & (1 << i)) == 0) { |
329 | struct phy_device *phydev; | |
e1393456 | 330 | |
4fd5f812 | 331 | phydev = mdiobus_scan(bus, i); |
161c8d2f | 332 | if (IS_ERR(phydev)) { |
4fd5f812 | 333 | err = PTR_ERR(phydev); |
161c8d2f KH |
334 | goto error; |
335 | } | |
64b1c2b4 | 336 | } |
e1393456 AF |
337 | } |
338 | ||
161c8d2f | 339 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 340 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 341 | return 0; |
e1393456 | 342 | |
161c8d2f KH |
343 | error: |
344 | while (--i >= 0) { | |
7f854420 | 345 | struct phy_device *phydev = mdiobus_get_phy(bus, i); |
38737e49 RK |
346 | if (phydev) { |
347 | phy_device_remove(phydev); | |
348 | phy_device_free(phydev); | |
349 | } | |
161c8d2f KH |
350 | } |
351 | device_del(&bus->dev); | |
e1393456 AF |
352 | return err; |
353 | } | |
3e3aaf64 | 354 | EXPORT_SYMBOL(__mdiobus_register); |
e1393456 AF |
355 | |
356 | void mdiobus_unregister(struct mii_bus *bus) | |
357 | { | |
358 | int i; | |
359 | ||
46abc021 LB |
360 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
361 | bus->state = MDIOBUS_UNREGISTERED; | |
362 | ||
e1393456 | 363 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
7f854420 | 364 | struct phy_device *phydev = mdiobus_get_phy(bus, i); |
38737e49 RK |
365 | if (phydev) { |
366 | phy_device_remove(phydev); | |
367 | phy_device_free(phydev); | |
368 | } | |
e1393456 | 369 | } |
b6c6aedc | 370 | device_del(&bus->dev); |
e1393456 AF |
371 | } |
372 | EXPORT_SYMBOL(mdiobus_unregister); | |
373 | ||
298cf9be LB |
374 | /** |
375 | * mdiobus_free - free a struct mii_bus | |
376 | * @bus: mii_bus to free | |
377 | * | |
46abc021 LB |
378 | * This function releases the reference to the underlying device |
379 | * object in the mii_bus. If this is the last reference, the mii_bus | |
380 | * will be freed. | |
298cf9be LB |
381 | */ |
382 | void mdiobus_free(struct mii_bus *bus) | |
383 | { | |
02d320c3 | 384 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
385 | if (bus->state == MDIOBUS_ALLOCATED) { |
386 | kfree(bus); | |
387 | return; | |
388 | } | |
389 | ||
390 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
391 | bus->state = MDIOBUS_RELEASED; | |
392 | ||
393 | put_device(&bus->dev); | |
298cf9be LB |
394 | } |
395 | EXPORT_SYMBOL(mdiobus_free); | |
396 | ||
4fd5f812 LB |
397 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
398 | { | |
399 | struct phy_device *phydev; | |
400 | int err; | |
401 | ||
ac28b9f8 | 402 | phydev = get_phy_device(bus, addr, false); |
4fd5f812 LB |
403 | if (IS_ERR(phydev) || phydev == NULL) |
404 | return phydev; | |
405 | ||
86f6cf41 DM |
406 | /* |
407 | * For DT, see if the auto-probed phy has a correspoding child | |
408 | * in the bus node, and set the of_node pointer in this case. | |
409 | */ | |
f03bc4ae | 410 | of_mdiobus_link_mdiodev(bus, &phydev->mdio); |
86f6cf41 | 411 | |
4dea547f | 412 | err = phy_device_register(phydev); |
4fd5f812 | 413 | if (err) { |
4fd5f812 | 414 | phy_device_free(phydev); |
4dea547f | 415 | return NULL; |
4fd5f812 LB |
416 | } |
417 | ||
4fd5f812 LB |
418 | return phydev; |
419 | } | |
420 | EXPORT_SYMBOL(mdiobus_scan); | |
421 | ||
21dd19fe NA |
422 | /** |
423 | * mdiobus_read_nested - Nested version of the mdiobus_read function | |
424 | * @bus: the mii_bus struct | |
425 | * @addr: the phy address | |
426 | * @regnum: register number to read | |
427 | * | |
428 | * In case of nested MDIO bus access avoid lockdep false positives by | |
429 | * using mutex_lock_nested(). | |
430 | * | |
431 | * NOTE: MUST NOT be called from interrupt context, | |
432 | * because the bus read/write functions may wait for an interrupt | |
433 | * to conclude the operation. | |
434 | */ | |
435 | int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) | |
436 | { | |
437 | int retval; | |
438 | ||
439 | BUG_ON(in_interrupt()); | |
440 | ||
441 | mutex_lock_nested(&bus->mdio_lock, SINGLE_DEPTH_NESTING); | |
442 | retval = bus->read(bus, addr, regnum); | |
443 | mutex_unlock(&bus->mdio_lock); | |
444 | ||
445 | return retval; | |
446 | } | |
447 | EXPORT_SYMBOL(mdiobus_read_nested); | |
448 | ||
2e888103 LB |
449 | /** |
450 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
451 | * @bus: the mii_bus struct | |
452 | * @addr: the phy address | |
453 | * @regnum: register number to read | |
454 | * | |
455 | * NOTE: MUST NOT be called from interrupt context, | |
456 | * because the bus read/write functions may wait for an interrupt | |
457 | * to conclude the operation. | |
458 | */ | |
abf35df2 | 459 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
460 | { |
461 | int retval; | |
462 | ||
463 | BUG_ON(in_interrupt()); | |
464 | ||
465 | mutex_lock(&bus->mdio_lock); | |
466 | retval = bus->read(bus, addr, regnum); | |
467 | mutex_unlock(&bus->mdio_lock); | |
468 | ||
469 | return retval; | |
470 | } | |
471 | EXPORT_SYMBOL(mdiobus_read); | |
472 | ||
21dd19fe NA |
473 | /** |
474 | * mdiobus_write_nested - Nested version of the mdiobus_write function | |
475 | * @bus: the mii_bus struct | |
476 | * @addr: the phy address | |
477 | * @regnum: register number to write | |
478 | * @val: value to write to @regnum | |
479 | * | |
480 | * In case of nested MDIO bus access avoid lockdep false positives by | |
481 | * using mutex_lock_nested(). | |
482 | * | |
483 | * NOTE: MUST NOT be called from interrupt context, | |
484 | * because the bus read/write functions may wait for an interrupt | |
485 | * to conclude the operation. | |
486 | */ | |
487 | int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
488 | { | |
489 | int err; | |
490 | ||
491 | BUG_ON(in_interrupt()); | |
492 | ||
493 | mutex_lock_nested(&bus->mdio_lock, SINGLE_DEPTH_NESTING); | |
494 | err = bus->write(bus, addr, regnum, val); | |
495 | mutex_unlock(&bus->mdio_lock); | |
496 | ||
497 | return err; | |
498 | } | |
499 | EXPORT_SYMBOL(mdiobus_write_nested); | |
500 | ||
2e888103 LB |
501 | /** |
502 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
503 | * @bus: the mii_bus struct | |
504 | * @addr: the phy address | |
505 | * @regnum: register number to write | |
506 | * @val: value to write to @regnum | |
507 | * | |
508 | * NOTE: MUST NOT be called from interrupt context, | |
509 | * because the bus read/write functions may wait for an interrupt | |
510 | * to conclude the operation. | |
511 | */ | |
abf35df2 | 512 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
513 | { |
514 | int err; | |
515 | ||
516 | BUG_ON(in_interrupt()); | |
517 | ||
518 | mutex_lock(&bus->mdio_lock); | |
519 | err = bus->write(bus, addr, regnum, val); | |
520 | mutex_unlock(&bus->mdio_lock); | |
521 | ||
522 | return err; | |
523 | } | |
524 | EXPORT_SYMBOL(mdiobus_write); | |
525 | ||
b3df0da8 | 526 | /** |
e76a4957 AL |
527 | * mdio_bus_match - determine if given MDIO driver supports the given |
528 | * MDIO device | |
529 | * @dev: target MDIO device | |
530 | * @drv: given MDIO driver | |
00db8189 | 531 | * |
e76a4957 AL |
532 | * Description: Given a MDIO device, and a MDIO driver, return 1 if |
533 | * the driver supports the device. Otherwise, return 0. This may | |
534 | * require calling the devices own match function, since different classes | |
535 | * of MDIO devices have different match criteria. | |
00db8189 AF |
536 | */ |
537 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
538 | { | |
e76a4957 | 539 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 540 | |
a30e2c18 DD |
541 | if (of_driver_match_device(dev, drv)) |
542 | return 1; | |
543 | ||
e76a4957 AL |
544 | if (mdio->bus_match) |
545 | return mdio->bus_match(dev, drv); | |
a30e2c18 | 546 | |
e76a4957 | 547 | return 0; |
00db8189 AF |
548 | } |
549 | ||
2f5cb434 | 550 | #ifdef CONFIG_PM |
2f5cb434 | 551 | static int mdio_bus_suspend(struct device *dev) |
00db8189 | 552 | { |
bc87922f | 553 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 554 | |
bc87922f AL |
555 | if (mdio->pm_ops && mdio->pm_ops->suspend) |
556 | return mdio->pm_ops->suspend(dev); | |
541cd3ee | 557 | |
bc87922f | 558 | return 0; |
00db8189 AF |
559 | } |
560 | ||
2f5cb434 | 561 | static int mdio_bus_resume(struct device *dev) |
00db8189 | 562 | { |
bc87922f | 563 | struct mdio_device *mdio = to_mdio_device(dev); |
541cd3ee | 564 | |
bc87922f AL |
565 | if (mdio->pm_ops && mdio->pm_ops->resume) |
566 | return mdio->pm_ops->resume(dev); | |
541cd3ee AV |
567 | |
568 | return 0; | |
00db8189 AF |
569 | } |
570 | ||
2f5cb434 AV |
571 | static int mdio_bus_restore(struct device *dev) |
572 | { | |
bc87922f | 573 | struct mdio_device *mdio = to_mdio_device(dev); |
2f5cb434 | 574 | |
bc87922f AL |
575 | if (mdio->pm_ops && mdio->pm_ops->restore) |
576 | return mdio->pm_ops->restore(dev); | |
2f5cb434 AV |
577 | |
578 | return 0; | |
579 | } | |
580 | ||
02d320c3 | 581 | static const struct dev_pm_ops mdio_bus_pm_ops = { |
2f5cb434 AV |
582 | .suspend = mdio_bus_suspend, |
583 | .resume = mdio_bus_resume, | |
584 | .freeze = mdio_bus_suspend, | |
585 | .thaw = mdio_bus_resume, | |
586 | .restore = mdio_bus_restore, | |
587 | }; | |
588 | ||
589 | #define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops) | |
590 | ||
591 | #else | |
592 | ||
593 | #define MDIO_BUS_PM_OPS NULL | |
594 | ||
595 | #endif /* CONFIG_PM */ | |
596 | ||
00db8189 AF |
597 | struct bus_type mdio_bus_type = { |
598 | .name = "mdio_bus", | |
599 | .match = mdio_bus_match, | |
2f5cb434 | 600 | .pm = MDIO_BUS_PM_OPS, |
00db8189 | 601 | }; |
11b0bacd | 602 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 603 | |
67c4f3fa | 604 | int __init mdio_bus_init(void) |
00db8189 | 605 | { |
46abc021 LB |
606 | int ret; |
607 | ||
608 | ret = class_register(&mdio_bus_class); | |
609 | if (!ret) { | |
610 | ret = bus_register(&mdio_bus_type); | |
611 | if (ret) | |
612 | class_unregister(&mdio_bus_class); | |
613 | } | |
614 | ||
615 | return ret; | |
00db8189 AF |
616 | } |
617 | ||
dc85dec6 | 618 | void mdio_bus_exit(void) |
e1393456 | 619 | { |
46abc021 | 620 | class_unregister(&mdio_bus_class); |
e1393456 AF |
621 | bus_unregister(&mdio_bus_type); |
622 | } |