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 | |
e22e996b UKK |
41 | #define CREATE_TRACE_POINTS |
42 | #include <trace/events/mdio.h> | |
43 | ||
7f854420 AL |
44 | int mdiobus_register_device(struct mdio_device *mdiodev) |
45 | { | |
46 | if (mdiodev->bus->mdio_map[mdiodev->addr]) | |
47 | return -EBUSY; | |
48 | ||
49 | mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev; | |
50 | ||
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL(mdiobus_register_device); | |
54 | ||
55 | int mdiobus_unregister_device(struct mdio_device *mdiodev) | |
56 | { | |
57 | if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev) | |
58 | return -EINVAL; | |
59 | ||
60 | mdiodev->bus->mdio_map[mdiodev->addr] = NULL; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | EXPORT_SYMBOL(mdiobus_unregister_device); | |
65 | ||
66 | struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr) | |
67 | { | |
68 | struct mdio_device *mdiodev = bus->mdio_map[addr]; | |
69 | ||
70 | if (!mdiodev) | |
71 | return NULL; | |
72 | ||
73 | if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY)) | |
74 | return NULL; | |
75 | ||
76 | return container_of(mdiodev, struct phy_device, mdio); | |
77 | } | |
78 | EXPORT_SYMBOL(mdiobus_get_phy); | |
79 | ||
80 | bool mdiobus_is_registered_device(struct mii_bus *bus, int addr) | |
81 | { | |
82 | return bus->mdio_map[addr]; | |
83 | } | |
84 | EXPORT_SYMBOL(mdiobus_is_registered_device); | |
85 | ||
298cf9be | 86 | /** |
eb8a54a7 | 87 | * mdiobus_alloc_size - allocate a mii_bus structure |
af58f1d6 RD |
88 | * @size: extra amount of memory to allocate for private storage. |
89 | * If non-zero, then bus->priv is points to that memory. | |
298cf9be LB |
90 | * |
91 | * Description: called by a bus driver to allocate an mii_bus | |
92 | * structure to fill in. | |
93 | */ | |
eb8a54a7 | 94 | struct mii_bus *mdiobus_alloc_size(size_t size) |
298cf9be | 95 | { |
46abc021 | 96 | struct mii_bus *bus; |
eb8a54a7 TT |
97 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
98 | size_t alloc_size; | |
e7f4dc35 | 99 | int i; |
eb8a54a7 TT |
100 | |
101 | /* If we alloc extra space, it should be aligned */ | |
102 | if (size) | |
103 | alloc_size = aligned_size + size; | |
104 | else | |
105 | alloc_size = sizeof(*bus); | |
46abc021 | 106 | |
eb8a54a7 | 107 | bus = kzalloc(alloc_size, GFP_KERNEL); |
db9107b4 DC |
108 | if (!bus) |
109 | return NULL; | |
110 | ||
111 | bus->state = MDIOBUS_ALLOCATED; | |
112 | if (size) | |
113 | bus->priv = (void *)bus + aligned_size; | |
46abc021 | 114 | |
e7f4dc35 AL |
115 | /* Initialise the interrupts to polling */ |
116 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
117 | bus->irq[i] = PHY_POLL; | |
118 | ||
46abc021 | 119 | return bus; |
298cf9be | 120 | } |
eb8a54a7 | 121 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 122 | |
6d48f44b GS |
123 | static void _devm_mdiobus_free(struct device *dev, void *res) |
124 | { | |
125 | mdiobus_free(*(struct mii_bus **)res); | |
126 | } | |
127 | ||
128 | static int devm_mdiobus_match(struct device *dev, void *res, void *data) | |
129 | { | |
130 | struct mii_bus **r = res; | |
131 | ||
132 | if (WARN_ON(!r || !*r)) | |
133 | return 0; | |
134 | ||
135 | return *r == data; | |
136 | } | |
137 | ||
138 | /** | |
139 | * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size() | |
140 | * @dev: Device to allocate mii_bus for | |
141 | * @sizeof_priv: Space to allocate for private structure. | |
142 | * | |
143 | * Managed mdiobus_alloc_size. mii_bus allocated with this function is | |
144 | * automatically freed on driver detach. | |
145 | * | |
146 | * If an mii_bus allocated with this function needs to be freed separately, | |
147 | * devm_mdiobus_free() must be used. | |
148 | * | |
149 | * RETURNS: | |
150 | * Pointer to allocated mii_bus on success, NULL on failure. | |
151 | */ | |
152 | struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv) | |
153 | { | |
154 | struct mii_bus **ptr, *bus; | |
155 | ||
156 | ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL); | |
157 | if (!ptr) | |
158 | return NULL; | |
159 | ||
160 | /* use raw alloc_dr for kmalloc caller tracing */ | |
161 | bus = mdiobus_alloc_size(sizeof_priv); | |
162 | if (bus) { | |
163 | *ptr = bus; | |
164 | devres_add(dev, ptr); | |
165 | } else { | |
166 | devres_free(ptr); | |
167 | } | |
168 | ||
169 | return bus; | |
170 | } | |
93dccc59 | 171 | EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size); |
6d48f44b GS |
172 | |
173 | /** | |
174 | * devm_mdiobus_free - Resource-managed mdiobus_free() | |
175 | * @dev: Device this mii_bus belongs to | |
176 | * @bus: the mii_bus associated with the device | |
177 | * | |
178 | * Free mii_bus allocated with devm_mdiobus_alloc_size(). | |
179 | */ | |
180 | void devm_mdiobus_free(struct device *dev, struct mii_bus *bus) | |
181 | { | |
182 | int rc; | |
183 | ||
184 | rc = devres_release(dev, _devm_mdiobus_free, | |
185 | devm_mdiobus_match, bus); | |
186 | WARN_ON(rc); | |
187 | } | |
188 | EXPORT_SYMBOL_GPL(devm_mdiobus_free); | |
189 | ||
46abc021 LB |
190 | /** |
191 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 192 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
193 | * |
194 | * Description: called when the last reference to an mii_bus is | |
195 | * dropped, to free the underlying memory. | |
196 | */ | |
197 | static void mdiobus_release(struct device *d) | |
198 | { | |
199 | struct mii_bus *bus = to_mii_bus(d); | |
161c8d2f KH |
200 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
201 | /* for compatibility with error handling in drivers */ | |
202 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
203 | kfree(bus); |
204 | } | |
205 | ||
206 | static struct class mdio_bus_class = { | |
207 | .name = "mdio_bus", | |
208 | .dev_release = mdiobus_release, | |
209 | }; | |
210 | ||
b943fbb0 | 211 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 | 212 | /* Helper function for of_mdio_find_bus */ |
9f3b795a | 213 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
25106022 DD |
214 | { |
215 | return dev->of_node == mdio_bus_np; | |
216 | } | |
217 | /** | |
218 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 219 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 | 220 | * |
a1364421 RK |
221 | * Returns a reference to the mii_bus, or NULL if none found. The |
222 | * embedded struct device will have its reference count incremented, | |
223 | * and this must be put once the bus is finished with. | |
25106022 DD |
224 | * |
225 | * Because the association of a device_node and mii_bus is made via | |
226 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
227 | * registered with of_mdiobus_register(). | |
228 | * | |
229 | */ | |
230 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
231 | { | |
232 | struct device *d; | |
233 | ||
234 | if (!mdio_bus_np) | |
235 | return NULL; | |
236 | ||
237 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, | |
238 | of_mdio_bus_match); | |
239 | ||
240 | return d ? to_mii_bus(d) : NULL; | |
241 | } | |
242 | EXPORT_SYMBOL(of_mdio_find_bus); | |
d9daa247 | 243 | |
f03bc4ae AL |
244 | /* Walk the list of subnodes of a mdio bus and look for a node that |
245 | * matches the mdio device's address with its 'reg' property. If | |
246 | * found, set the of_node pointer for the mdio device. This allows | |
247 | * auto-probed phy devices to be supplied with information passed in | |
248 | * via DT. | |
d9daa247 | 249 | */ |
f03bc4ae AL |
250 | static void of_mdiobus_link_mdiodev(struct mii_bus *bus, |
251 | struct mdio_device *mdiodev) | |
d9daa247 | 252 | { |
f03bc4ae | 253 | struct device *dev = &mdiodev->dev; |
d9daa247 DM |
254 | struct device_node *child; |
255 | ||
e5a03bfd | 256 | if (dev->of_node || !bus->dev.of_node) |
d9daa247 DM |
257 | return; |
258 | ||
e5a03bfd | 259 | for_each_available_child_of_node(bus->dev.of_node, child) { |
d9daa247 DM |
260 | int addr; |
261 | int ret; | |
262 | ||
263 | ret = of_property_read_u32(child, "reg", &addr); | |
264 | if (ret < 0) { | |
f03bc4ae | 265 | dev_err(dev, "%s has invalid MDIO address\n", |
d9daa247 DM |
266 | child->full_name); |
267 | continue; | |
268 | } | |
269 | ||
f03bc4ae | 270 | /* A MDIO device must have a reg property in the range [0-31] */ |
d9daa247 | 271 | if (addr >= PHY_MAX_ADDR) { |
f03bc4ae | 272 | dev_err(dev, "%s MDIO address %i is too large\n", |
d9daa247 DM |
273 | child->full_name, addr); |
274 | continue; | |
275 | } | |
276 | ||
f03bc4ae | 277 | if (addr == mdiodev->addr) { |
d9daa247 DM |
278 | dev->of_node = child; |
279 | return; | |
280 | } | |
281 | } | |
282 | } | |
283 | #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ | |
f03bc4ae AL |
284 | static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
285 | struct mdio_device *mdiodev) | |
d9daa247 DM |
286 | { |
287 | } | |
25106022 DD |
288 | #endif |
289 | ||
b3df0da8 | 290 | /** |
59f06978 | 291 | * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
b3df0da8 | 292 | * @bus: target mii_bus |
59f06978 | 293 | * @owner: module containing bus accessor functions |
e1393456 | 294 | * |
b3df0da8 | 295 | * Description: Called by a bus driver to bring up all the PHYs |
59f06978 RK |
296 | * on a given bus, and attach them to the bus. Drivers should use |
297 | * mdiobus_register() rather than __mdiobus_register() unless they | |
f89df3f3 AL |
298 | * need to pass a specific owner module. MDIO devices which are not |
299 | * PHYs will not be brought up by this function. They are expected to | |
300 | * to be explicitly listed in DT and instantiated by of_mdiobus_register(). | |
b3df0da8 RD |
301 | * |
302 | * Returns 0 on success or < 0 on error. | |
e1393456 | 303 | */ |
3e3aaf64 | 304 | int __mdiobus_register(struct mii_bus *bus, struct module *owner) |
e1393456 | 305 | { |
711fdba3 | 306 | struct mdio_device *mdiodev; |
161c8d2f | 307 | int i, err; |
e1393456 | 308 | |
e1393456 | 309 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 310 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
311 | return -EINVAL; |
312 | ||
46abc021 LB |
313 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
314 | bus->state != MDIOBUS_UNREGISTERED); | |
315 | ||
3e3aaf64 | 316 | bus->owner = owner; |
46abc021 LB |
317 | bus->dev.parent = bus->parent; |
318 | bus->dev.class = &mdio_bus_class; | |
319 | bus->dev.groups = NULL; | |
036b6687 | 320 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 LB |
321 | |
322 | err = device_register(&bus->dev); | |
323 | if (err) { | |
8d242488 | 324 | pr_err("mii_bus %s failed to register\n", bus->id); |
0c692d07 | 325 | put_device(&bus->dev); |
46abc021 LB |
326 | return -EINVAL; |
327 | } | |
328 | ||
d1e7fe4d AB |
329 | mutex_init(&bus->mdio_lock); |
330 | ||
e1393456 AF |
331 | if (bus->reset) |
332 | bus->reset(bus); | |
333 | ||
334 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
4fd5f812 LB |
335 | if ((bus->phy_mask & (1 << i)) == 0) { |
336 | struct phy_device *phydev; | |
e1393456 | 337 | |
4fd5f812 | 338 | phydev = mdiobus_scan(bus, i); |
70e927b9 | 339 | if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) { |
4fd5f812 | 340 | err = PTR_ERR(phydev); |
161c8d2f KH |
341 | goto error; |
342 | } | |
64b1c2b4 | 343 | } |
e1393456 AF |
344 | } |
345 | ||
161c8d2f | 346 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 347 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 348 | return 0; |
e1393456 | 349 | |
161c8d2f KH |
350 | error: |
351 | while (--i >= 0) { | |
711fdba3 AL |
352 | mdiodev = bus->mdio_map[i]; |
353 | if (!mdiodev) | |
354 | continue; | |
355 | ||
356 | mdiodev->device_remove(mdiodev); | |
357 | mdiodev->device_free(mdiodev); | |
161c8d2f KH |
358 | } |
359 | device_del(&bus->dev); | |
e1393456 AF |
360 | return err; |
361 | } | |
3e3aaf64 | 362 | EXPORT_SYMBOL(__mdiobus_register); |
e1393456 AF |
363 | |
364 | void mdiobus_unregister(struct mii_bus *bus) | |
365 | { | |
a9049e0c | 366 | struct mdio_device *mdiodev; |
e1393456 AF |
367 | int i; |
368 | ||
46abc021 LB |
369 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
370 | bus->state = MDIOBUS_UNREGISTERED; | |
371 | ||
e1393456 | 372 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
a9049e0c AL |
373 | mdiodev = bus->mdio_map[i]; |
374 | if (!mdiodev) | |
375 | continue; | |
376 | ||
711fdba3 AL |
377 | mdiodev->device_remove(mdiodev); |
378 | mdiodev->device_free(mdiodev); | |
e1393456 | 379 | } |
b6c6aedc | 380 | device_del(&bus->dev); |
e1393456 AF |
381 | } |
382 | EXPORT_SYMBOL(mdiobus_unregister); | |
383 | ||
298cf9be LB |
384 | /** |
385 | * mdiobus_free - free a struct mii_bus | |
386 | * @bus: mii_bus to free | |
387 | * | |
46abc021 LB |
388 | * This function releases the reference to the underlying device |
389 | * object in the mii_bus. If this is the last reference, the mii_bus | |
390 | * will be freed. | |
298cf9be LB |
391 | */ |
392 | void mdiobus_free(struct mii_bus *bus) | |
393 | { | |
02d320c3 | 394 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
395 | if (bus->state == MDIOBUS_ALLOCATED) { |
396 | kfree(bus); | |
397 | return; | |
398 | } | |
399 | ||
400 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
401 | bus->state = MDIOBUS_RELEASED; | |
402 | ||
403 | put_device(&bus->dev); | |
298cf9be LB |
404 | } |
405 | EXPORT_SYMBOL(mdiobus_free); | |
406 | ||
f89df3f3 AL |
407 | /** |
408 | * mdiobus_scan - scan a bus for MDIO devices. | |
409 | * @bus: mii_bus to scan | |
410 | * @addr: address on bus to scan | |
411 | * | |
412 | * This function scans the MDIO bus, looking for devices which can be | |
413 | * identified using a vendor/product ID in registers 2 and 3. Not all | |
414 | * MDIO devices have such registers, but PHY devices typically | |
415 | * do. Hence this function assumes anything found is a PHY, or can be | |
416 | * treated as a PHY. Other MDIO devices, such as switches, will | |
417 | * probably not be found during the scan. | |
418 | */ | |
4fd5f812 LB |
419 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
420 | { | |
421 | struct phy_device *phydev; | |
422 | int err; | |
423 | ||
ac28b9f8 | 424 | phydev = get_phy_device(bus, addr, false); |
66c239e7 | 425 | if (IS_ERR(phydev)) |
4fd5f812 LB |
426 | return phydev; |
427 | ||
86f6cf41 DM |
428 | /* |
429 | * For DT, see if the auto-probed phy has a correspoding child | |
430 | * in the bus node, and set the of_node pointer in this case. | |
431 | */ | |
f03bc4ae | 432 | of_mdiobus_link_mdiodev(bus, &phydev->mdio); |
86f6cf41 | 433 | |
4dea547f | 434 | err = phy_device_register(phydev); |
4fd5f812 | 435 | if (err) { |
4fd5f812 | 436 | phy_device_free(phydev); |
e98a3aab | 437 | return ERR_PTR(-ENODEV); |
4fd5f812 LB |
438 | } |
439 | ||
4fd5f812 LB |
440 | return phydev; |
441 | } | |
442 | EXPORT_SYMBOL(mdiobus_scan); | |
443 | ||
21dd19fe NA |
444 | /** |
445 | * mdiobus_read_nested - Nested version of the mdiobus_read function | |
446 | * @bus: the mii_bus struct | |
447 | * @addr: the phy address | |
448 | * @regnum: register number to read | |
449 | * | |
450 | * In case of nested MDIO bus access avoid lockdep false positives by | |
451 | * using mutex_lock_nested(). | |
452 | * | |
453 | * NOTE: MUST NOT be called from interrupt context, | |
454 | * because the bus read/write functions may wait for an interrupt | |
455 | * to conclude the operation. | |
456 | */ | |
457 | int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) | |
458 | { | |
459 | int retval; | |
460 | ||
461 | BUG_ON(in_interrupt()); | |
462 | ||
9a6f2b01 | 463 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
21dd19fe NA |
464 | retval = bus->read(bus, addr, regnum); |
465 | mutex_unlock(&bus->mdio_lock); | |
466 | ||
e22e996b UKK |
467 | trace_mdio_access(bus, 1, addr, regnum, retval, retval); |
468 | ||
21dd19fe NA |
469 | return retval; |
470 | } | |
471 | EXPORT_SYMBOL(mdiobus_read_nested); | |
472 | ||
2e888103 LB |
473 | /** |
474 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
475 | * @bus: the mii_bus struct | |
476 | * @addr: the phy address | |
477 | * @regnum: register number to read | |
478 | * | |
479 | * NOTE: MUST NOT be called from interrupt context, | |
480 | * because the bus read/write functions may wait for an interrupt | |
481 | * to conclude the operation. | |
482 | */ | |
abf35df2 | 483 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
484 | { |
485 | int retval; | |
486 | ||
487 | BUG_ON(in_interrupt()); | |
488 | ||
489 | mutex_lock(&bus->mdio_lock); | |
490 | retval = bus->read(bus, addr, regnum); | |
491 | mutex_unlock(&bus->mdio_lock); | |
492 | ||
e22e996b UKK |
493 | trace_mdio_access(bus, 1, addr, regnum, retval, retval); |
494 | ||
2e888103 LB |
495 | return retval; |
496 | } | |
497 | EXPORT_SYMBOL(mdiobus_read); | |
498 | ||
21dd19fe NA |
499 | /** |
500 | * mdiobus_write_nested - Nested version of the mdiobus_write function | |
501 | * @bus: the mii_bus struct | |
502 | * @addr: the phy address | |
503 | * @regnum: register number to write | |
504 | * @val: value to write to @regnum | |
505 | * | |
506 | * In case of nested MDIO bus access avoid lockdep false positives by | |
507 | * using mutex_lock_nested(). | |
508 | * | |
509 | * NOTE: MUST NOT be called from interrupt context, | |
510 | * because the bus read/write functions may wait for an interrupt | |
511 | * to conclude the operation. | |
512 | */ | |
513 | int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
514 | { | |
515 | int err; | |
516 | ||
517 | BUG_ON(in_interrupt()); | |
518 | ||
9a6f2b01 | 519 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
21dd19fe NA |
520 | err = bus->write(bus, addr, regnum, val); |
521 | mutex_unlock(&bus->mdio_lock); | |
522 | ||
e22e996b UKK |
523 | trace_mdio_access(bus, 0, addr, regnum, val, err); |
524 | ||
21dd19fe NA |
525 | return err; |
526 | } | |
527 | EXPORT_SYMBOL(mdiobus_write_nested); | |
528 | ||
2e888103 LB |
529 | /** |
530 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
531 | * @bus: the mii_bus struct | |
532 | * @addr: the phy address | |
533 | * @regnum: register number to write | |
534 | * @val: value to write to @regnum | |
535 | * | |
536 | * NOTE: MUST NOT be called from interrupt context, | |
537 | * because the bus read/write functions may wait for an interrupt | |
538 | * to conclude the operation. | |
539 | */ | |
abf35df2 | 540 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
541 | { |
542 | int err; | |
543 | ||
544 | BUG_ON(in_interrupt()); | |
545 | ||
546 | mutex_lock(&bus->mdio_lock); | |
547 | err = bus->write(bus, addr, regnum, val); | |
548 | mutex_unlock(&bus->mdio_lock); | |
549 | ||
e22e996b UKK |
550 | trace_mdio_access(bus, 0, addr, regnum, val, err); |
551 | ||
2e888103 LB |
552 | return err; |
553 | } | |
554 | EXPORT_SYMBOL(mdiobus_write); | |
555 | ||
b3df0da8 | 556 | /** |
e76a4957 AL |
557 | * mdio_bus_match - determine if given MDIO driver supports the given |
558 | * MDIO device | |
559 | * @dev: target MDIO device | |
560 | * @drv: given MDIO driver | |
00db8189 | 561 | * |
e76a4957 AL |
562 | * Description: Given a MDIO device, and a MDIO driver, return 1 if |
563 | * the driver supports the device. Otherwise, return 0. This may | |
564 | * require calling the devices own match function, since different classes | |
565 | * of MDIO devices have different match criteria. | |
00db8189 AF |
566 | */ |
567 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
568 | { | |
e76a4957 | 569 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 570 | |
a30e2c18 DD |
571 | if (of_driver_match_device(dev, drv)) |
572 | return 1; | |
573 | ||
e76a4957 AL |
574 | if (mdio->bus_match) |
575 | return mdio->bus_match(dev, drv); | |
a30e2c18 | 576 | |
e76a4957 | 577 | return 0; |
00db8189 AF |
578 | } |
579 | ||
2f5cb434 | 580 | #ifdef CONFIG_PM |
2f5cb434 | 581 | static int mdio_bus_suspend(struct device *dev) |
00db8189 | 582 | { |
bc87922f | 583 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 584 | |
bc87922f AL |
585 | if (mdio->pm_ops && mdio->pm_ops->suspend) |
586 | return mdio->pm_ops->suspend(dev); | |
541cd3ee | 587 | |
bc87922f | 588 | return 0; |
00db8189 AF |
589 | } |
590 | ||
2f5cb434 | 591 | static int mdio_bus_resume(struct device *dev) |
00db8189 | 592 | { |
bc87922f | 593 | struct mdio_device *mdio = to_mdio_device(dev); |
541cd3ee | 594 | |
bc87922f AL |
595 | if (mdio->pm_ops && mdio->pm_ops->resume) |
596 | return mdio->pm_ops->resume(dev); | |
541cd3ee AV |
597 | |
598 | return 0; | |
00db8189 AF |
599 | } |
600 | ||
2f5cb434 AV |
601 | static int mdio_bus_restore(struct device *dev) |
602 | { | |
bc87922f | 603 | struct mdio_device *mdio = to_mdio_device(dev); |
2f5cb434 | 604 | |
bc87922f AL |
605 | if (mdio->pm_ops && mdio->pm_ops->restore) |
606 | return mdio->pm_ops->restore(dev); | |
2f5cb434 AV |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
02d320c3 | 611 | static const struct dev_pm_ops mdio_bus_pm_ops = { |
2f5cb434 AV |
612 | .suspend = mdio_bus_suspend, |
613 | .resume = mdio_bus_resume, | |
614 | .freeze = mdio_bus_suspend, | |
615 | .thaw = mdio_bus_resume, | |
616 | .restore = mdio_bus_restore, | |
617 | }; | |
618 | ||
619 | #define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops) | |
620 | ||
621 | #else | |
622 | ||
623 | #define MDIO_BUS_PM_OPS NULL | |
624 | ||
625 | #endif /* CONFIG_PM */ | |
626 | ||
00db8189 AF |
627 | struct bus_type mdio_bus_type = { |
628 | .name = "mdio_bus", | |
629 | .match = mdio_bus_match, | |
2f5cb434 | 630 | .pm = MDIO_BUS_PM_OPS, |
00db8189 | 631 | }; |
11b0bacd | 632 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 633 | |
67c4f3fa | 634 | int __init mdio_bus_init(void) |
00db8189 | 635 | { |
46abc021 LB |
636 | int ret; |
637 | ||
638 | ret = class_register(&mdio_bus_class); | |
639 | if (!ret) { | |
640 | ret = bus_register(&mdio_bus_type); | |
641 | if (ret) | |
642 | class_unregister(&mdio_bus_class); | |
643 | } | |
644 | ||
645 | return ret; | |
00db8189 AF |
646 | } |
647 | ||
dc85dec6 | 648 | void mdio_bus_exit(void) |
e1393456 | 649 | { |
46abc021 | 650 | class_unregister(&mdio_bus_class); |
e1393456 AF |
651 | bus_unregister(&mdio_bus_type); |
652 | } |