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 | 104 | bus = kzalloc(alloc_size, GFP_KERNEL); |
db9107b4 DC |
105 | if (!bus) |
106 | return NULL; | |
107 | ||
108 | bus->state = MDIOBUS_ALLOCATED; | |
109 | if (size) | |
110 | bus->priv = (void *)bus + aligned_size; | |
46abc021 | 111 | |
e7f4dc35 AL |
112 | /* Initialise the interrupts to polling */ |
113 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
114 | bus->irq[i] = PHY_POLL; | |
115 | ||
46abc021 | 116 | return bus; |
298cf9be | 117 | } |
eb8a54a7 | 118 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 119 | |
6d48f44b GS |
120 | static void _devm_mdiobus_free(struct device *dev, void *res) |
121 | { | |
122 | mdiobus_free(*(struct mii_bus **)res); | |
123 | } | |
124 | ||
125 | static int devm_mdiobus_match(struct device *dev, void *res, void *data) | |
126 | { | |
127 | struct mii_bus **r = res; | |
128 | ||
129 | if (WARN_ON(!r || !*r)) | |
130 | return 0; | |
131 | ||
132 | return *r == data; | |
133 | } | |
134 | ||
135 | /** | |
136 | * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size() | |
137 | * @dev: Device to allocate mii_bus for | |
138 | * @sizeof_priv: Space to allocate for private structure. | |
139 | * | |
140 | * Managed mdiobus_alloc_size. mii_bus allocated with this function is | |
141 | * automatically freed on driver detach. | |
142 | * | |
143 | * If an mii_bus allocated with this function needs to be freed separately, | |
144 | * devm_mdiobus_free() must be used. | |
145 | * | |
146 | * RETURNS: | |
147 | * Pointer to allocated mii_bus on success, NULL on failure. | |
148 | */ | |
149 | struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv) | |
150 | { | |
151 | struct mii_bus **ptr, *bus; | |
152 | ||
153 | ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL); | |
154 | if (!ptr) | |
155 | return NULL; | |
156 | ||
157 | /* use raw alloc_dr for kmalloc caller tracing */ | |
158 | bus = mdiobus_alloc_size(sizeof_priv); | |
159 | if (bus) { | |
160 | *ptr = bus; | |
161 | devres_add(dev, ptr); | |
162 | } else { | |
163 | devres_free(ptr); | |
164 | } | |
165 | ||
166 | return bus; | |
167 | } | |
93dccc59 | 168 | EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size); |
6d48f44b GS |
169 | |
170 | /** | |
171 | * devm_mdiobus_free - Resource-managed mdiobus_free() | |
172 | * @dev: Device this mii_bus belongs to | |
173 | * @bus: the mii_bus associated with the device | |
174 | * | |
175 | * Free mii_bus allocated with devm_mdiobus_alloc_size(). | |
176 | */ | |
177 | void devm_mdiobus_free(struct device *dev, struct mii_bus *bus) | |
178 | { | |
179 | int rc; | |
180 | ||
181 | rc = devres_release(dev, _devm_mdiobus_free, | |
182 | devm_mdiobus_match, bus); | |
183 | WARN_ON(rc); | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(devm_mdiobus_free); | |
186 | ||
46abc021 LB |
187 | /** |
188 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 189 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
190 | * |
191 | * Description: called when the last reference to an mii_bus is | |
192 | * dropped, to free the underlying memory. | |
193 | */ | |
194 | static void mdiobus_release(struct device *d) | |
195 | { | |
196 | struct mii_bus *bus = to_mii_bus(d); | |
161c8d2f KH |
197 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
198 | /* for compatibility with error handling in drivers */ | |
199 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
200 | kfree(bus); |
201 | } | |
202 | ||
203 | static struct class mdio_bus_class = { | |
204 | .name = "mdio_bus", | |
205 | .dev_release = mdiobus_release, | |
206 | }; | |
207 | ||
b943fbb0 | 208 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 | 209 | /* Helper function for of_mdio_find_bus */ |
9f3b795a | 210 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
25106022 DD |
211 | { |
212 | return dev->of_node == mdio_bus_np; | |
213 | } | |
214 | /** | |
215 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 216 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 | 217 | * |
a1364421 RK |
218 | * Returns a reference to the mii_bus, or NULL if none found. The |
219 | * embedded struct device will have its reference count incremented, | |
220 | * and this must be put once the bus is finished with. | |
25106022 DD |
221 | * |
222 | * Because the association of a device_node and mii_bus is made via | |
223 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
224 | * registered with of_mdiobus_register(). | |
225 | * | |
226 | */ | |
227 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
228 | { | |
229 | struct device *d; | |
230 | ||
231 | if (!mdio_bus_np) | |
232 | return NULL; | |
233 | ||
234 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, | |
235 | of_mdio_bus_match); | |
236 | ||
237 | return d ? to_mii_bus(d) : NULL; | |
238 | } | |
239 | EXPORT_SYMBOL(of_mdio_find_bus); | |
d9daa247 | 240 | |
f03bc4ae AL |
241 | /* Walk the list of subnodes of a mdio bus and look for a node that |
242 | * matches the mdio device's address with its 'reg' property. If | |
243 | * found, set the of_node pointer for the mdio device. This allows | |
244 | * auto-probed phy devices to be supplied with information passed in | |
245 | * via DT. | |
d9daa247 | 246 | */ |
f03bc4ae AL |
247 | static void of_mdiobus_link_mdiodev(struct mii_bus *bus, |
248 | struct mdio_device *mdiodev) | |
d9daa247 | 249 | { |
f03bc4ae | 250 | struct device *dev = &mdiodev->dev; |
d9daa247 DM |
251 | struct device_node *child; |
252 | ||
e5a03bfd | 253 | if (dev->of_node || !bus->dev.of_node) |
d9daa247 DM |
254 | return; |
255 | ||
e5a03bfd | 256 | for_each_available_child_of_node(bus->dev.of_node, child) { |
d9daa247 DM |
257 | int addr; |
258 | int ret; | |
259 | ||
260 | ret = of_property_read_u32(child, "reg", &addr); | |
261 | if (ret < 0) { | |
f03bc4ae | 262 | dev_err(dev, "%s has invalid MDIO address\n", |
d9daa247 DM |
263 | child->full_name); |
264 | continue; | |
265 | } | |
266 | ||
f03bc4ae | 267 | /* A MDIO device must have a reg property in the range [0-31] */ |
d9daa247 | 268 | if (addr >= PHY_MAX_ADDR) { |
f03bc4ae | 269 | dev_err(dev, "%s MDIO address %i is too large\n", |
d9daa247 DM |
270 | child->full_name, addr); |
271 | continue; | |
272 | } | |
273 | ||
f03bc4ae | 274 | if (addr == mdiodev->addr) { |
d9daa247 DM |
275 | dev->of_node = child; |
276 | return; | |
277 | } | |
278 | } | |
279 | } | |
280 | #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ | |
f03bc4ae AL |
281 | static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
282 | struct mdio_device *mdiodev) | |
d9daa247 DM |
283 | { |
284 | } | |
25106022 DD |
285 | #endif |
286 | ||
b3df0da8 | 287 | /** |
59f06978 | 288 | * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
b3df0da8 | 289 | * @bus: target mii_bus |
59f06978 | 290 | * @owner: module containing bus accessor functions |
e1393456 | 291 | * |
b3df0da8 | 292 | * Description: Called by a bus driver to bring up all the PHYs |
59f06978 RK |
293 | * on a given bus, and attach them to the bus. Drivers should use |
294 | * mdiobus_register() rather than __mdiobus_register() unless they | |
f89df3f3 AL |
295 | * need to pass a specific owner module. MDIO devices which are not |
296 | * PHYs will not be brought up by this function. They are expected to | |
297 | * to be explicitly listed in DT and instantiated by of_mdiobus_register(). | |
b3df0da8 RD |
298 | * |
299 | * Returns 0 on success or < 0 on error. | |
e1393456 | 300 | */ |
3e3aaf64 | 301 | int __mdiobus_register(struct mii_bus *bus, struct module *owner) |
e1393456 | 302 | { |
711fdba3 | 303 | struct mdio_device *mdiodev; |
161c8d2f | 304 | int i, err; |
e1393456 | 305 | |
e1393456 | 306 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 307 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
308 | return -EINVAL; |
309 | ||
46abc021 LB |
310 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
311 | bus->state != MDIOBUS_UNREGISTERED); | |
312 | ||
3e3aaf64 | 313 | bus->owner = owner; |
46abc021 LB |
314 | bus->dev.parent = bus->parent; |
315 | bus->dev.class = &mdio_bus_class; | |
316 | bus->dev.groups = NULL; | |
036b6687 | 317 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 LB |
318 | |
319 | err = device_register(&bus->dev); | |
320 | if (err) { | |
8d242488 | 321 | pr_err("mii_bus %s failed to register\n", bus->id); |
0c692d07 | 322 | put_device(&bus->dev); |
46abc021 LB |
323 | return -EINVAL; |
324 | } | |
325 | ||
d1e7fe4d AB |
326 | mutex_init(&bus->mdio_lock); |
327 | ||
e1393456 AF |
328 | if (bus->reset) |
329 | bus->reset(bus); | |
330 | ||
331 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
4fd5f812 LB |
332 | if ((bus->phy_mask & (1 << i)) == 0) { |
333 | struct phy_device *phydev; | |
e1393456 | 334 | |
4fd5f812 | 335 | phydev = mdiobus_scan(bus, i); |
70e927b9 | 336 | if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) { |
4fd5f812 | 337 | err = PTR_ERR(phydev); |
161c8d2f KH |
338 | goto error; |
339 | } | |
64b1c2b4 | 340 | } |
e1393456 AF |
341 | } |
342 | ||
161c8d2f | 343 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 344 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 345 | return 0; |
e1393456 | 346 | |
161c8d2f KH |
347 | error: |
348 | while (--i >= 0) { | |
711fdba3 AL |
349 | mdiodev = bus->mdio_map[i]; |
350 | if (!mdiodev) | |
351 | continue; | |
352 | ||
353 | mdiodev->device_remove(mdiodev); | |
354 | mdiodev->device_free(mdiodev); | |
161c8d2f KH |
355 | } |
356 | device_del(&bus->dev); | |
e1393456 AF |
357 | return err; |
358 | } | |
3e3aaf64 | 359 | EXPORT_SYMBOL(__mdiobus_register); |
e1393456 AF |
360 | |
361 | void mdiobus_unregister(struct mii_bus *bus) | |
362 | { | |
a9049e0c | 363 | struct mdio_device *mdiodev; |
e1393456 AF |
364 | int i; |
365 | ||
46abc021 LB |
366 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
367 | bus->state = MDIOBUS_UNREGISTERED; | |
368 | ||
e1393456 | 369 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
a9049e0c AL |
370 | mdiodev = bus->mdio_map[i]; |
371 | if (!mdiodev) | |
372 | continue; | |
373 | ||
711fdba3 AL |
374 | mdiodev->device_remove(mdiodev); |
375 | mdiodev->device_free(mdiodev); | |
e1393456 | 376 | } |
b6c6aedc | 377 | device_del(&bus->dev); |
e1393456 AF |
378 | } |
379 | EXPORT_SYMBOL(mdiobus_unregister); | |
380 | ||
298cf9be LB |
381 | /** |
382 | * mdiobus_free - free a struct mii_bus | |
383 | * @bus: mii_bus to free | |
384 | * | |
46abc021 LB |
385 | * This function releases the reference to the underlying device |
386 | * object in the mii_bus. If this is the last reference, the mii_bus | |
387 | * will be freed. | |
298cf9be LB |
388 | */ |
389 | void mdiobus_free(struct mii_bus *bus) | |
390 | { | |
02d320c3 | 391 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
392 | if (bus->state == MDIOBUS_ALLOCATED) { |
393 | kfree(bus); | |
394 | return; | |
395 | } | |
396 | ||
397 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
398 | bus->state = MDIOBUS_RELEASED; | |
399 | ||
400 | put_device(&bus->dev); | |
298cf9be LB |
401 | } |
402 | EXPORT_SYMBOL(mdiobus_free); | |
403 | ||
f89df3f3 AL |
404 | /** |
405 | * mdiobus_scan - scan a bus for MDIO devices. | |
406 | * @bus: mii_bus to scan | |
407 | * @addr: address on bus to scan | |
408 | * | |
409 | * This function scans the MDIO bus, looking for devices which can be | |
410 | * identified using a vendor/product ID in registers 2 and 3. Not all | |
411 | * MDIO devices have such registers, but PHY devices typically | |
412 | * do. Hence this function assumes anything found is a PHY, or can be | |
413 | * treated as a PHY. Other MDIO devices, such as switches, will | |
414 | * probably not be found during the scan. | |
415 | */ | |
4fd5f812 LB |
416 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
417 | { | |
418 | struct phy_device *phydev; | |
419 | int err; | |
420 | ||
ac28b9f8 | 421 | phydev = get_phy_device(bus, addr, false); |
66c239e7 | 422 | if (IS_ERR(phydev)) |
4fd5f812 LB |
423 | return phydev; |
424 | ||
86f6cf41 DM |
425 | /* |
426 | * For DT, see if the auto-probed phy has a correspoding child | |
427 | * in the bus node, and set the of_node pointer in this case. | |
428 | */ | |
f03bc4ae | 429 | of_mdiobus_link_mdiodev(bus, &phydev->mdio); |
86f6cf41 | 430 | |
4dea547f | 431 | err = phy_device_register(phydev); |
4fd5f812 | 432 | if (err) { |
4fd5f812 | 433 | phy_device_free(phydev); |
e98a3aab | 434 | return ERR_PTR(-ENODEV); |
4fd5f812 LB |
435 | } |
436 | ||
4fd5f812 LB |
437 | return phydev; |
438 | } | |
439 | EXPORT_SYMBOL(mdiobus_scan); | |
440 | ||
21dd19fe NA |
441 | /** |
442 | * mdiobus_read_nested - Nested version of the mdiobus_read function | |
443 | * @bus: the mii_bus struct | |
444 | * @addr: the phy address | |
445 | * @regnum: register number to read | |
446 | * | |
447 | * In case of nested MDIO bus access avoid lockdep false positives by | |
448 | * using mutex_lock_nested(). | |
449 | * | |
450 | * NOTE: MUST NOT be called from interrupt context, | |
451 | * because the bus read/write functions may wait for an interrupt | |
452 | * to conclude the operation. | |
453 | */ | |
454 | int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) | |
455 | { | |
456 | int retval; | |
457 | ||
458 | BUG_ON(in_interrupt()); | |
459 | ||
9a6f2b01 | 460 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
21dd19fe NA |
461 | retval = bus->read(bus, addr, regnum); |
462 | mutex_unlock(&bus->mdio_lock); | |
463 | ||
464 | return retval; | |
465 | } | |
466 | EXPORT_SYMBOL(mdiobus_read_nested); | |
467 | ||
2e888103 LB |
468 | /** |
469 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
470 | * @bus: the mii_bus struct | |
471 | * @addr: the phy address | |
472 | * @regnum: register number to read | |
473 | * | |
474 | * NOTE: MUST NOT be called from interrupt context, | |
475 | * because the bus read/write functions may wait for an interrupt | |
476 | * to conclude the operation. | |
477 | */ | |
abf35df2 | 478 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
479 | { |
480 | int retval; | |
481 | ||
482 | BUG_ON(in_interrupt()); | |
483 | ||
484 | mutex_lock(&bus->mdio_lock); | |
485 | retval = bus->read(bus, addr, regnum); | |
486 | mutex_unlock(&bus->mdio_lock); | |
487 | ||
488 | return retval; | |
489 | } | |
490 | EXPORT_SYMBOL(mdiobus_read); | |
491 | ||
21dd19fe NA |
492 | /** |
493 | * mdiobus_write_nested - Nested version of the mdiobus_write function | |
494 | * @bus: the mii_bus struct | |
495 | * @addr: the phy address | |
496 | * @regnum: register number to write | |
497 | * @val: value to write to @regnum | |
498 | * | |
499 | * In case of nested MDIO bus access avoid lockdep false positives by | |
500 | * using mutex_lock_nested(). | |
501 | * | |
502 | * NOTE: MUST NOT be called from interrupt context, | |
503 | * because the bus read/write functions may wait for an interrupt | |
504 | * to conclude the operation. | |
505 | */ | |
506 | int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
507 | { | |
508 | int err; | |
509 | ||
510 | BUG_ON(in_interrupt()); | |
511 | ||
9a6f2b01 | 512 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
21dd19fe NA |
513 | err = bus->write(bus, addr, regnum, val); |
514 | mutex_unlock(&bus->mdio_lock); | |
515 | ||
516 | return err; | |
517 | } | |
518 | EXPORT_SYMBOL(mdiobus_write_nested); | |
519 | ||
2e888103 LB |
520 | /** |
521 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
522 | * @bus: the mii_bus struct | |
523 | * @addr: the phy address | |
524 | * @regnum: register number to write | |
525 | * @val: value to write to @regnum | |
526 | * | |
527 | * NOTE: MUST NOT be called from interrupt context, | |
528 | * because the bus read/write functions may wait for an interrupt | |
529 | * to conclude the operation. | |
530 | */ | |
abf35df2 | 531 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
532 | { |
533 | int err; | |
534 | ||
535 | BUG_ON(in_interrupt()); | |
536 | ||
537 | mutex_lock(&bus->mdio_lock); | |
538 | err = bus->write(bus, addr, regnum, val); | |
539 | mutex_unlock(&bus->mdio_lock); | |
540 | ||
541 | return err; | |
542 | } | |
543 | EXPORT_SYMBOL(mdiobus_write); | |
544 | ||
b3df0da8 | 545 | /** |
e76a4957 AL |
546 | * mdio_bus_match - determine if given MDIO driver supports the given |
547 | * MDIO device | |
548 | * @dev: target MDIO device | |
549 | * @drv: given MDIO driver | |
00db8189 | 550 | * |
e76a4957 AL |
551 | * Description: Given a MDIO device, and a MDIO driver, return 1 if |
552 | * the driver supports the device. Otherwise, return 0. This may | |
553 | * require calling the devices own match function, since different classes | |
554 | * of MDIO devices have different match criteria. | |
00db8189 AF |
555 | */ |
556 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
557 | { | |
e76a4957 | 558 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 559 | |
a30e2c18 DD |
560 | if (of_driver_match_device(dev, drv)) |
561 | return 1; | |
562 | ||
e76a4957 AL |
563 | if (mdio->bus_match) |
564 | return mdio->bus_match(dev, drv); | |
a30e2c18 | 565 | |
e76a4957 | 566 | return 0; |
00db8189 AF |
567 | } |
568 | ||
2f5cb434 | 569 | #ifdef CONFIG_PM |
2f5cb434 | 570 | static int mdio_bus_suspend(struct device *dev) |
00db8189 | 571 | { |
bc87922f | 572 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 573 | |
bc87922f AL |
574 | if (mdio->pm_ops && mdio->pm_ops->suspend) |
575 | return mdio->pm_ops->suspend(dev); | |
541cd3ee | 576 | |
bc87922f | 577 | return 0; |
00db8189 AF |
578 | } |
579 | ||
2f5cb434 | 580 | static int mdio_bus_resume(struct device *dev) |
00db8189 | 581 | { |
bc87922f | 582 | struct mdio_device *mdio = to_mdio_device(dev); |
541cd3ee | 583 | |
bc87922f AL |
584 | if (mdio->pm_ops && mdio->pm_ops->resume) |
585 | return mdio->pm_ops->resume(dev); | |
541cd3ee AV |
586 | |
587 | return 0; | |
00db8189 AF |
588 | } |
589 | ||
2f5cb434 AV |
590 | static int mdio_bus_restore(struct device *dev) |
591 | { | |
bc87922f | 592 | struct mdio_device *mdio = to_mdio_device(dev); |
2f5cb434 | 593 | |
bc87922f AL |
594 | if (mdio->pm_ops && mdio->pm_ops->restore) |
595 | return mdio->pm_ops->restore(dev); | |
2f5cb434 AV |
596 | |
597 | return 0; | |
598 | } | |
599 | ||
02d320c3 | 600 | static const struct dev_pm_ops mdio_bus_pm_ops = { |
2f5cb434 AV |
601 | .suspend = mdio_bus_suspend, |
602 | .resume = mdio_bus_resume, | |
603 | .freeze = mdio_bus_suspend, | |
604 | .thaw = mdio_bus_resume, | |
605 | .restore = mdio_bus_restore, | |
606 | }; | |
607 | ||
608 | #define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops) | |
609 | ||
610 | #else | |
611 | ||
612 | #define MDIO_BUS_PM_OPS NULL | |
613 | ||
614 | #endif /* CONFIG_PM */ | |
615 | ||
00db8189 AF |
616 | struct bus_type mdio_bus_type = { |
617 | .name = "mdio_bus", | |
618 | .match = mdio_bus_match, | |
2f5cb434 | 619 | .pm = MDIO_BUS_PM_OPS, |
00db8189 | 620 | }; |
11b0bacd | 621 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 622 | |
67c4f3fa | 623 | int __init mdio_bus_init(void) |
00db8189 | 624 | { |
46abc021 LB |
625 | int ret; |
626 | ||
627 | ret = class_register(&mdio_bus_class); | |
628 | if (!ret) { | |
629 | ret = bus_register(&mdio_bus_type); | |
630 | if (ret) | |
631 | class_unregister(&mdio_bus_class); | |
632 | } | |
633 | ||
634 | return ret; | |
00db8189 AF |
635 | } |
636 | ||
dc85dec6 | 637 | void mdio_bus_exit(void) |
e1393456 | 638 | { |
46abc021 | 639 | class_unregister(&mdio_bus_class); |
e1393456 AF |
640 | bus_unregister(&mdio_bus_type); |
641 | } |