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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> |
69226896 RQ |
25 | #include <linux/gpio.h> |
26 | #include <linux/gpio/consumer.h> | |
a30e2c18 | 27 | #include <linux/of_device.h> |
4085a7f0 | 28 | #include <linux/of_mdio.h> |
69226896 | 29 | #include <linux/of_gpio.h> |
00db8189 AF |
30 | #include <linux/netdevice.h> |
31 | #include <linux/etherdevice.h> | |
32 | #include <linux/skbuff.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/module.h> | |
00db8189 AF |
36 | #include <linux/mii.h> |
37 | #include <linux/ethtool.h> | |
38 | #include <linux/phy.h> | |
02d320c3 SS |
39 | #include <linux/io.h> |
40 | #include <linux/uaccess.h> | |
00db8189 | 41 | |
00db8189 | 42 | #include <asm/irq.h> |
00db8189 | 43 | |
e22e996b UKK |
44 | #define CREATE_TRACE_POINTS |
45 | #include <trace/events/mdio.h> | |
46 | ||
648ea013 FF |
47 | #include "mdio-boardinfo.h" |
48 | ||
ee7e16b6 | 49 | static int mdiobus_register_gpiod(struct mdio_device *mdiodev) |
7f854420 | 50 | { |
bafbdd52 SS |
51 | struct gpio_desc *gpiod = NULL; |
52 | ||
bafbdd52 SS |
53 | /* Deassert the optional reset signal */ |
54 | if (mdiodev->dev.of_node) | |
55 | gpiod = fwnode_get_named_gpiod(&mdiodev->dev.of_node->fwnode, | |
56 | "reset-gpios", 0, GPIOD_OUT_LOW, | |
57 | "PHY reset"); | |
a56c6980 AL |
58 | if (PTR_ERR(gpiod) == -ENOENT || |
59 | PTR_ERR(gpiod) == -ENOSYS) | |
bafbdd52 SS |
60 | gpiod = NULL; |
61 | else if (IS_ERR(gpiod)) | |
62 | return PTR_ERR(gpiod); | |
63 | ||
64 | mdiodev->reset = gpiod; | |
65 | ||
66 | /* Assert the reset signal again */ | |
67 | mdio_device_reset(mdiodev, 1); | |
68 | ||
ee7e16b6 AL |
69 | return 0; |
70 | } | |
71 | ||
72 | int mdiobus_register_device(struct mdio_device *mdiodev) | |
73 | { | |
74 | int err; | |
75 | ||
76 | if (mdiodev->bus->mdio_map[mdiodev->addr]) | |
77 | return -EBUSY; | |
78 | ||
79 | if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) { | |
80 | err = mdiobus_register_gpiod(mdiodev); | |
81 | if (err) | |
82 | return err; | |
83 | } | |
84 | ||
7f854420 AL |
85 | mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev; |
86 | ||
87 | return 0; | |
88 | } | |
89 | EXPORT_SYMBOL(mdiobus_register_device); | |
90 | ||
91 | int mdiobus_unregister_device(struct mdio_device *mdiodev) | |
92 | { | |
93 | if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev) | |
94 | return -EINVAL; | |
95 | ||
96 | mdiodev->bus->mdio_map[mdiodev->addr] = NULL; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | EXPORT_SYMBOL(mdiobus_unregister_device); | |
101 | ||
102 | struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr) | |
103 | { | |
104 | struct mdio_device *mdiodev = bus->mdio_map[addr]; | |
105 | ||
106 | if (!mdiodev) | |
107 | return NULL; | |
108 | ||
109 | if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY)) | |
110 | return NULL; | |
111 | ||
112 | return container_of(mdiodev, struct phy_device, mdio); | |
113 | } | |
114 | EXPORT_SYMBOL(mdiobus_get_phy); | |
115 | ||
116 | bool mdiobus_is_registered_device(struct mii_bus *bus, int addr) | |
117 | { | |
118 | return bus->mdio_map[addr]; | |
119 | } | |
120 | EXPORT_SYMBOL(mdiobus_is_registered_device); | |
121 | ||
298cf9be | 122 | /** |
eb8a54a7 | 123 | * mdiobus_alloc_size - allocate a mii_bus structure |
af58f1d6 RD |
124 | * @size: extra amount of memory to allocate for private storage. |
125 | * If non-zero, then bus->priv is points to that memory. | |
298cf9be LB |
126 | * |
127 | * Description: called by a bus driver to allocate an mii_bus | |
128 | * structure to fill in. | |
129 | */ | |
eb8a54a7 | 130 | struct mii_bus *mdiobus_alloc_size(size_t size) |
298cf9be | 131 | { |
46abc021 | 132 | struct mii_bus *bus; |
eb8a54a7 TT |
133 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
134 | size_t alloc_size; | |
e7f4dc35 | 135 | int i; |
eb8a54a7 TT |
136 | |
137 | /* If we alloc extra space, it should be aligned */ | |
138 | if (size) | |
139 | alloc_size = aligned_size + size; | |
140 | else | |
141 | alloc_size = sizeof(*bus); | |
46abc021 | 142 | |
eb8a54a7 | 143 | bus = kzalloc(alloc_size, GFP_KERNEL); |
db9107b4 DC |
144 | if (!bus) |
145 | return NULL; | |
146 | ||
147 | bus->state = MDIOBUS_ALLOCATED; | |
148 | if (size) | |
149 | bus->priv = (void *)bus + aligned_size; | |
46abc021 | 150 | |
e7f4dc35 AL |
151 | /* Initialise the interrupts to polling */ |
152 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
153 | bus->irq[i] = PHY_POLL; | |
154 | ||
46abc021 | 155 | return bus; |
298cf9be | 156 | } |
eb8a54a7 | 157 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 158 | |
6d48f44b GS |
159 | static void _devm_mdiobus_free(struct device *dev, void *res) |
160 | { | |
161 | mdiobus_free(*(struct mii_bus **)res); | |
162 | } | |
163 | ||
164 | static int devm_mdiobus_match(struct device *dev, void *res, void *data) | |
165 | { | |
166 | struct mii_bus **r = res; | |
167 | ||
168 | if (WARN_ON(!r || !*r)) | |
169 | return 0; | |
170 | ||
171 | return *r == data; | |
172 | } | |
173 | ||
174 | /** | |
175 | * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size() | |
176 | * @dev: Device to allocate mii_bus for | |
177 | * @sizeof_priv: Space to allocate for private structure. | |
178 | * | |
179 | * Managed mdiobus_alloc_size. mii_bus allocated with this function is | |
180 | * automatically freed on driver detach. | |
181 | * | |
182 | * If an mii_bus allocated with this function needs to be freed separately, | |
183 | * devm_mdiobus_free() must be used. | |
184 | * | |
185 | * RETURNS: | |
186 | * Pointer to allocated mii_bus on success, NULL on failure. | |
187 | */ | |
188 | struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv) | |
189 | { | |
190 | struct mii_bus **ptr, *bus; | |
191 | ||
192 | ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL); | |
193 | if (!ptr) | |
194 | return NULL; | |
195 | ||
196 | /* use raw alloc_dr for kmalloc caller tracing */ | |
197 | bus = mdiobus_alloc_size(sizeof_priv); | |
198 | if (bus) { | |
199 | *ptr = bus; | |
200 | devres_add(dev, ptr); | |
201 | } else { | |
202 | devres_free(ptr); | |
203 | } | |
204 | ||
205 | return bus; | |
206 | } | |
93dccc59 | 207 | EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size); |
6d48f44b GS |
208 | |
209 | /** | |
210 | * devm_mdiobus_free - Resource-managed mdiobus_free() | |
211 | * @dev: Device this mii_bus belongs to | |
212 | * @bus: the mii_bus associated with the device | |
213 | * | |
214 | * Free mii_bus allocated with devm_mdiobus_alloc_size(). | |
215 | */ | |
216 | void devm_mdiobus_free(struct device *dev, struct mii_bus *bus) | |
217 | { | |
218 | int rc; | |
219 | ||
220 | rc = devres_release(dev, _devm_mdiobus_free, | |
221 | devm_mdiobus_match, bus); | |
222 | WARN_ON(rc); | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(devm_mdiobus_free); | |
225 | ||
46abc021 LB |
226 | /** |
227 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 228 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
229 | * |
230 | * Description: called when the last reference to an mii_bus is | |
231 | * dropped, to free the underlying memory. | |
232 | */ | |
233 | static void mdiobus_release(struct device *d) | |
234 | { | |
235 | struct mii_bus *bus = to_mii_bus(d); | |
161c8d2f KH |
236 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
237 | /* for compatibility with error handling in drivers */ | |
238 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
239 | kfree(bus); |
240 | } | |
241 | ||
242 | static struct class mdio_bus_class = { | |
243 | .name = "mdio_bus", | |
244 | .dev_release = mdiobus_release, | |
245 | }; | |
246 | ||
b943fbb0 | 247 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 | 248 | /* Helper function for of_mdio_find_bus */ |
9f3b795a | 249 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
25106022 DD |
250 | { |
251 | return dev->of_node == mdio_bus_np; | |
252 | } | |
253 | /** | |
254 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 255 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 | 256 | * |
a1364421 RK |
257 | * Returns a reference to the mii_bus, or NULL if none found. The |
258 | * embedded struct device will have its reference count incremented, | |
259 | * and this must be put once the bus is finished with. | |
25106022 DD |
260 | * |
261 | * Because the association of a device_node and mii_bus is made via | |
262 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
263 | * registered with of_mdiobus_register(). | |
264 | * | |
265 | */ | |
266 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
267 | { | |
268 | struct device *d; | |
269 | ||
270 | if (!mdio_bus_np) | |
271 | return NULL; | |
272 | ||
273 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, | |
274 | of_mdio_bus_match); | |
275 | ||
276 | return d ? to_mii_bus(d) : NULL; | |
277 | } | |
278 | EXPORT_SYMBOL(of_mdio_find_bus); | |
d9daa247 | 279 | |
f03bc4ae AL |
280 | /* Walk the list of subnodes of a mdio bus and look for a node that |
281 | * matches the mdio device's address with its 'reg' property. If | |
282 | * found, set the of_node pointer for the mdio device. This allows | |
283 | * auto-probed phy devices to be supplied with information passed in | |
284 | * via DT. | |
d9daa247 | 285 | */ |
f03bc4ae AL |
286 | static void of_mdiobus_link_mdiodev(struct mii_bus *bus, |
287 | struct mdio_device *mdiodev) | |
d9daa247 | 288 | { |
f03bc4ae | 289 | struct device *dev = &mdiodev->dev; |
d9daa247 DM |
290 | struct device_node *child; |
291 | ||
e5a03bfd | 292 | if (dev->of_node || !bus->dev.of_node) |
d9daa247 DM |
293 | return; |
294 | ||
e5a03bfd | 295 | for_each_available_child_of_node(bus->dev.of_node, child) { |
d9daa247 | 296 | int addr; |
d9daa247 | 297 | |
d0a65400 JM |
298 | addr = of_mdio_parse_addr(dev, child); |
299 | if (addr < 0) | |
d9daa247 | 300 | continue; |
d9daa247 | 301 | |
f03bc4ae | 302 | if (addr == mdiodev->addr) { |
d9daa247 | 303 | dev->of_node = child; |
94a5ef1b | 304 | dev->fwnode = of_fwnode_handle(child); |
d9daa247 DM |
305 | return; |
306 | } | |
307 | } | |
308 | } | |
309 | #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ | |
f03bc4ae AL |
310 | static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
311 | struct mdio_device *mdiodev) | |
d9daa247 DM |
312 | { |
313 | } | |
25106022 DD |
314 | #endif |
315 | ||
d0281a56 FF |
316 | /** |
317 | * mdiobus_create_device_from_board_info - create a full MDIO device given | |
318 | * a mdio_board_info structure | |
319 | * @bus: MDIO bus to create the devices on | |
320 | * @bi: mdio_board_info structure describing the devices | |
321 | * | |
322 | * Returns 0 on success or < 0 on error. | |
323 | */ | |
324 | static int mdiobus_create_device(struct mii_bus *bus, | |
325 | struct mdio_board_info *bi) | |
326 | { | |
327 | struct mdio_device *mdiodev; | |
328 | int ret = 0; | |
329 | ||
330 | mdiodev = mdio_device_create(bus, bi->mdio_addr); | |
331 | if (IS_ERR(mdiodev)) | |
332 | return -ENODEV; | |
333 | ||
334 | strncpy(mdiodev->modalias, bi->modalias, | |
335 | sizeof(mdiodev->modalias)); | |
336 | mdiodev->bus_match = mdio_device_bus_match; | |
337 | mdiodev->dev.platform_data = (void *)bi->platform_data; | |
338 | ||
339 | ret = mdio_device_register(mdiodev); | |
340 | if (ret) | |
341 | mdio_device_free(mdiodev); | |
342 | ||
343 | return ret; | |
344 | } | |
345 | ||
b3df0da8 | 346 | /** |
59f06978 | 347 | * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
b3df0da8 | 348 | * @bus: target mii_bus |
59f06978 | 349 | * @owner: module containing bus accessor functions |
e1393456 | 350 | * |
b3df0da8 | 351 | * Description: Called by a bus driver to bring up all the PHYs |
59f06978 RK |
352 | * on a given bus, and attach them to the bus. Drivers should use |
353 | * mdiobus_register() rather than __mdiobus_register() unless they | |
f89df3f3 AL |
354 | * need to pass a specific owner module. MDIO devices which are not |
355 | * PHYs will not be brought up by this function. They are expected to | |
356 | * to be explicitly listed in DT and instantiated by of_mdiobus_register(). | |
b3df0da8 RD |
357 | * |
358 | * Returns 0 on success or < 0 on error. | |
e1393456 | 359 | */ |
3e3aaf64 | 360 | int __mdiobus_register(struct mii_bus *bus, struct module *owner) |
e1393456 | 361 | { |
711fdba3 | 362 | struct mdio_device *mdiodev; |
161c8d2f | 363 | int i, err; |
69226896 | 364 | struct gpio_desc *gpiod; |
e1393456 | 365 | |
e1393456 | 366 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 367 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
368 | return -EINVAL; |
369 | ||
46abc021 LB |
370 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
371 | bus->state != MDIOBUS_UNREGISTERED); | |
372 | ||
3e3aaf64 | 373 | bus->owner = owner; |
46abc021 LB |
374 | bus->dev.parent = bus->parent; |
375 | bus->dev.class = &mdio_bus_class; | |
376 | bus->dev.groups = NULL; | |
036b6687 | 377 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 LB |
378 | |
379 | err = device_register(&bus->dev); | |
380 | if (err) { | |
8d242488 | 381 | pr_err("mii_bus %s failed to register\n", bus->id); |
0c692d07 | 382 | put_device(&bus->dev); |
46abc021 LB |
383 | return -EINVAL; |
384 | } | |
385 | ||
d1e7fe4d AB |
386 | mutex_init(&bus->mdio_lock); |
387 | ||
d396e84c | 388 | /* de-assert bus level PHY GPIO reset */ |
fe0e4052 | 389 | gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW); |
d396e84c | 390 | if (IS_ERR(gpiod)) { |
fe0e4052 SS |
391 | dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n", |
392 | bus->id); | |
e40e2a2e | 393 | device_del(&bus->dev); |
fe0e4052 SS |
394 | return PTR_ERR(gpiod); |
395 | } else if (gpiod) { | |
d396e84c SS |
396 | bus->reset_gpiod = gpiod; |
397 | ||
398 | gpiod_set_value_cansleep(gpiod, 1); | |
399 | udelay(bus->reset_delay_us); | |
400 | gpiod_set_value_cansleep(gpiod, 0); | |
69226896 RQ |
401 | } |
402 | ||
df0c8d91 FF |
403 | if (bus->reset) |
404 | bus->reset(bus); | |
405 | ||
e1393456 | 406 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
4fd5f812 LB |
407 | if ((bus->phy_mask & (1 << i)) == 0) { |
408 | struct phy_device *phydev; | |
e1393456 | 409 | |
4fd5f812 | 410 | phydev = mdiobus_scan(bus, i); |
70e927b9 | 411 | if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) { |
4fd5f812 | 412 | err = PTR_ERR(phydev); |
161c8d2f KH |
413 | goto error; |
414 | } | |
64b1c2b4 | 415 | } |
e1393456 AF |
416 | } |
417 | ||
d0281a56 | 418 | mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device); |
648ea013 | 419 | |
161c8d2f | 420 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 421 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 422 | return 0; |
e1393456 | 423 | |
161c8d2f KH |
424 | error: |
425 | while (--i >= 0) { | |
711fdba3 AL |
426 | mdiodev = bus->mdio_map[i]; |
427 | if (!mdiodev) | |
428 | continue; | |
429 | ||
430 | mdiodev->device_remove(mdiodev); | |
431 | mdiodev->device_free(mdiodev); | |
161c8d2f | 432 | } |
69226896 RQ |
433 | |
434 | /* Put PHYs in RESET to save power */ | |
a010a2f6 FF |
435 | if (bus->reset_gpiod) |
436 | gpiod_set_value_cansleep(bus->reset_gpiod, 1); | |
69226896 | 437 | |
161c8d2f | 438 | device_del(&bus->dev); |
e1393456 AF |
439 | return err; |
440 | } | |
3e3aaf64 | 441 | EXPORT_SYMBOL(__mdiobus_register); |
e1393456 AF |
442 | |
443 | void mdiobus_unregister(struct mii_bus *bus) | |
444 | { | |
a9049e0c | 445 | struct mdio_device *mdiodev; |
e1393456 AF |
446 | int i; |
447 | ||
46abc021 LB |
448 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
449 | bus->state = MDIOBUS_UNREGISTERED; | |
450 | ||
e1393456 | 451 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
a9049e0c AL |
452 | mdiodev = bus->mdio_map[i]; |
453 | if (!mdiodev) | |
454 | continue; | |
455 | ||
bafbdd52 SS |
456 | if (mdiodev->reset) |
457 | gpiod_put(mdiodev->reset); | |
458 | ||
711fdba3 AL |
459 | mdiodev->device_remove(mdiodev); |
460 | mdiodev->device_free(mdiodev); | |
e1393456 | 461 | } |
69226896 RQ |
462 | |
463 | /* Put PHYs in RESET to save power */ | |
a010a2f6 FF |
464 | if (bus->reset_gpiod) |
465 | gpiod_set_value_cansleep(bus->reset_gpiod, 1); | |
69226896 | 466 | |
b6c6aedc | 467 | device_del(&bus->dev); |
e1393456 AF |
468 | } |
469 | EXPORT_SYMBOL(mdiobus_unregister); | |
470 | ||
298cf9be LB |
471 | /** |
472 | * mdiobus_free - free a struct mii_bus | |
473 | * @bus: mii_bus to free | |
474 | * | |
46abc021 LB |
475 | * This function releases the reference to the underlying device |
476 | * object in the mii_bus. If this is the last reference, the mii_bus | |
477 | * will be freed. | |
298cf9be LB |
478 | */ |
479 | void mdiobus_free(struct mii_bus *bus) | |
480 | { | |
02d320c3 | 481 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
482 | if (bus->state == MDIOBUS_ALLOCATED) { |
483 | kfree(bus); | |
484 | return; | |
485 | } | |
486 | ||
487 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
488 | bus->state = MDIOBUS_RELEASED; | |
489 | ||
490 | put_device(&bus->dev); | |
298cf9be LB |
491 | } |
492 | EXPORT_SYMBOL(mdiobus_free); | |
493 | ||
f89df3f3 AL |
494 | /** |
495 | * mdiobus_scan - scan a bus for MDIO devices. | |
496 | * @bus: mii_bus to scan | |
497 | * @addr: address on bus to scan | |
498 | * | |
499 | * This function scans the MDIO bus, looking for devices which can be | |
500 | * identified using a vendor/product ID in registers 2 and 3. Not all | |
501 | * MDIO devices have such registers, but PHY devices typically | |
502 | * do. Hence this function assumes anything found is a PHY, or can be | |
503 | * treated as a PHY. Other MDIO devices, such as switches, will | |
504 | * probably not be found during the scan. | |
505 | */ | |
4fd5f812 LB |
506 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
507 | { | |
508 | struct phy_device *phydev; | |
509 | int err; | |
510 | ||
ac28b9f8 | 511 | phydev = get_phy_device(bus, addr, false); |
66c239e7 | 512 | if (IS_ERR(phydev)) |
4fd5f812 LB |
513 | return phydev; |
514 | ||
86f6cf41 DM |
515 | /* |
516 | * For DT, see if the auto-probed phy has a correspoding child | |
517 | * in the bus node, and set the of_node pointer in this case. | |
518 | */ | |
f03bc4ae | 519 | of_mdiobus_link_mdiodev(bus, &phydev->mdio); |
86f6cf41 | 520 | |
4dea547f | 521 | err = phy_device_register(phydev); |
4fd5f812 | 522 | if (err) { |
4fd5f812 | 523 | phy_device_free(phydev); |
e98a3aab | 524 | return ERR_PTR(-ENODEV); |
4fd5f812 LB |
525 | } |
526 | ||
4fd5f812 LB |
527 | return phydev; |
528 | } | |
529 | EXPORT_SYMBOL(mdiobus_scan); | |
530 | ||
34dc08e4 RK |
531 | /** |
532 | * __mdiobus_read - Unlocked version of the mdiobus_read function | |
533 | * @bus: the mii_bus struct | |
534 | * @addr: the phy address | |
535 | * @regnum: register number to read | |
536 | * | |
537 | * Read a MDIO bus register. Caller must hold the mdio bus lock. | |
538 | * | |
539 | * NOTE: MUST NOT be called from interrupt context. | |
540 | */ | |
541 | int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) | |
542 | { | |
543 | int retval; | |
544 | ||
545 | WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock)); | |
546 | ||
547 | retval = bus->read(bus, addr, regnum); | |
548 | ||
549 | trace_mdio_access(bus, 1, addr, regnum, retval, retval); | |
550 | ||
551 | return retval; | |
552 | } | |
553 | EXPORT_SYMBOL(__mdiobus_read); | |
554 | ||
555 | /** | |
556 | * __mdiobus_write - Unlocked version of the mdiobus_write function | |
557 | * @bus: the mii_bus struct | |
558 | * @addr: the phy address | |
559 | * @regnum: register number to write | |
560 | * @val: value to write to @regnum | |
561 | * | |
562 | * Write a MDIO bus register. Caller must hold the mdio bus lock. | |
563 | * | |
564 | * NOTE: MUST NOT be called from interrupt context. | |
565 | */ | |
566 | int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
567 | { | |
568 | int err; | |
569 | ||
570 | WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock)); | |
571 | ||
572 | err = bus->write(bus, addr, regnum, val); | |
573 | ||
574 | trace_mdio_access(bus, 0, addr, regnum, val, err); | |
575 | ||
576 | return err; | |
577 | } | |
578 | EXPORT_SYMBOL(__mdiobus_write); | |
579 | ||
21dd19fe NA |
580 | /** |
581 | * mdiobus_read_nested - Nested version of the mdiobus_read function | |
582 | * @bus: the mii_bus struct | |
583 | * @addr: the phy address | |
584 | * @regnum: register number to read | |
585 | * | |
586 | * In case of nested MDIO bus access avoid lockdep false positives by | |
587 | * using mutex_lock_nested(). | |
588 | * | |
589 | * NOTE: MUST NOT be called from interrupt context, | |
590 | * because the bus read/write functions may wait for an interrupt | |
591 | * to conclude the operation. | |
592 | */ | |
593 | int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) | |
594 | { | |
595 | int retval; | |
596 | ||
597 | BUG_ON(in_interrupt()); | |
598 | ||
9a6f2b01 | 599 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
34dc08e4 | 600 | retval = __mdiobus_read(bus, addr, regnum); |
21dd19fe NA |
601 | mutex_unlock(&bus->mdio_lock); |
602 | ||
603 | return retval; | |
604 | } | |
605 | EXPORT_SYMBOL(mdiobus_read_nested); | |
606 | ||
2e888103 LB |
607 | /** |
608 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
609 | * @bus: the mii_bus struct | |
610 | * @addr: the phy address | |
611 | * @regnum: register number to read | |
612 | * | |
613 | * NOTE: MUST NOT be called from interrupt context, | |
614 | * because the bus read/write functions may wait for an interrupt | |
615 | * to conclude the operation. | |
616 | */ | |
abf35df2 | 617 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
618 | { |
619 | int retval; | |
620 | ||
621 | BUG_ON(in_interrupt()); | |
622 | ||
623 | mutex_lock(&bus->mdio_lock); | |
34dc08e4 | 624 | retval = __mdiobus_read(bus, addr, regnum); |
2e888103 LB |
625 | mutex_unlock(&bus->mdio_lock); |
626 | ||
627 | return retval; | |
628 | } | |
629 | EXPORT_SYMBOL(mdiobus_read); | |
630 | ||
21dd19fe NA |
631 | /** |
632 | * mdiobus_write_nested - Nested version of the mdiobus_write function | |
633 | * @bus: the mii_bus struct | |
634 | * @addr: the phy address | |
635 | * @regnum: register number to write | |
636 | * @val: value to write to @regnum | |
637 | * | |
638 | * In case of nested MDIO bus access avoid lockdep false positives by | |
639 | * using mutex_lock_nested(). | |
640 | * | |
641 | * NOTE: MUST NOT be called from interrupt context, | |
642 | * because the bus read/write functions may wait for an interrupt | |
643 | * to conclude the operation. | |
644 | */ | |
645 | int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
646 | { | |
647 | int err; | |
648 | ||
649 | BUG_ON(in_interrupt()); | |
650 | ||
9a6f2b01 | 651 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
34dc08e4 | 652 | err = __mdiobus_write(bus, addr, regnum, val); |
21dd19fe NA |
653 | mutex_unlock(&bus->mdio_lock); |
654 | ||
655 | return err; | |
656 | } | |
657 | EXPORT_SYMBOL(mdiobus_write_nested); | |
658 | ||
2e888103 LB |
659 | /** |
660 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
661 | * @bus: the mii_bus struct | |
662 | * @addr: the phy address | |
663 | * @regnum: register number to write | |
664 | * @val: value to write to @regnum | |
665 | * | |
666 | * NOTE: MUST NOT be called from interrupt context, | |
667 | * because the bus read/write functions may wait for an interrupt | |
668 | * to conclude the operation. | |
669 | */ | |
abf35df2 | 670 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
671 | { |
672 | int err; | |
673 | ||
674 | BUG_ON(in_interrupt()); | |
675 | ||
676 | mutex_lock(&bus->mdio_lock); | |
34dc08e4 | 677 | err = __mdiobus_write(bus, addr, regnum, val); |
2e888103 LB |
678 | mutex_unlock(&bus->mdio_lock); |
679 | ||
680 | return err; | |
681 | } | |
682 | EXPORT_SYMBOL(mdiobus_write); | |
683 | ||
b3df0da8 | 684 | /** |
e76a4957 AL |
685 | * mdio_bus_match - determine if given MDIO driver supports the given |
686 | * MDIO device | |
687 | * @dev: target MDIO device | |
688 | * @drv: given MDIO driver | |
00db8189 | 689 | * |
e76a4957 AL |
690 | * Description: Given a MDIO device, and a MDIO driver, return 1 if |
691 | * the driver supports the device. Otherwise, return 0. This may | |
692 | * require calling the devices own match function, since different classes | |
693 | * of MDIO devices have different match criteria. | |
00db8189 AF |
694 | */ |
695 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
696 | { | |
e76a4957 | 697 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 698 | |
a30e2c18 DD |
699 | if (of_driver_match_device(dev, drv)) |
700 | return 1; | |
701 | ||
e76a4957 AL |
702 | if (mdio->bus_match) |
703 | return mdio->bus_match(dev, drv); | |
a30e2c18 | 704 | |
e76a4957 | 705 | return 0; |
00db8189 AF |
706 | } |
707 | ||
1b8f8694 RK |
708 | static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env) |
709 | { | |
710 | int rc; | |
711 | ||
712 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
713 | rc = of_device_uevent_modalias(dev, env); | |
714 | if (rc != -ENODEV) | |
715 | return rc; | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
00db8189 AF |
720 | struct bus_type mdio_bus_type = { |
721 | .name = "mdio_bus", | |
722 | .match = mdio_bus_match, | |
1b8f8694 | 723 | .uevent = mdio_uevent, |
00db8189 | 724 | }; |
11b0bacd | 725 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 726 | |
67c4f3fa | 727 | int __init mdio_bus_init(void) |
00db8189 | 728 | { |
46abc021 LB |
729 | int ret; |
730 | ||
731 | ret = class_register(&mdio_bus_class); | |
732 | if (!ret) { | |
733 | ret = bus_register(&mdio_bus_type); | |
734 | if (ret) | |
735 | class_unregister(&mdio_bus_class); | |
736 | } | |
737 | ||
738 | return ret; | |
00db8189 | 739 | } |
90eff909 | 740 | EXPORT_SYMBOL_GPL(mdio_bus_init); |
00db8189 | 741 | |
90eff909 | 742 | #if IS_ENABLED(CONFIG_PHYLIB) |
dc85dec6 | 743 | void mdio_bus_exit(void) |
e1393456 | 744 | { |
46abc021 | 745 | class_unregister(&mdio_bus_class); |
e1393456 AF |
746 | bus_unregister(&mdio_bus_type); |
747 | } | |
90eff909 FF |
748 | EXPORT_SYMBOL_GPL(mdio_bus_exit); |
749 | #else | |
750 | module_init(mdio_bus_init); | |
751 | /* no module_exit, intentional */ | |
752 | MODULE_LICENSE("GPL"); | |
753 | MODULE_DESCRIPTION("MDIO bus/device layer"); | |
754 | #endif |