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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 | |
298cf9be | 41 | /** |
eb8a54a7 | 42 | * mdiobus_alloc_size - allocate a mii_bus structure |
af58f1d6 RD |
43 | * @size: extra amount of memory to allocate for private storage. |
44 | * If non-zero, then bus->priv is points to that memory. | |
298cf9be LB |
45 | * |
46 | * Description: called by a bus driver to allocate an mii_bus | |
47 | * structure to fill in. | |
48 | */ | |
eb8a54a7 | 49 | struct mii_bus *mdiobus_alloc_size(size_t size) |
298cf9be | 50 | { |
46abc021 | 51 | struct mii_bus *bus; |
eb8a54a7 TT |
52 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
53 | size_t alloc_size; | |
54 | ||
55 | /* If we alloc extra space, it should be aligned */ | |
56 | if (size) | |
57 | alloc_size = aligned_size + size; | |
58 | else | |
59 | alloc_size = sizeof(*bus); | |
46abc021 | 60 | |
eb8a54a7 TT |
61 | bus = kzalloc(alloc_size, GFP_KERNEL); |
62 | if (bus) { | |
46abc021 | 63 | bus->state = MDIOBUS_ALLOCATED; |
eb8a54a7 TT |
64 | if (size) |
65 | bus->priv = (void *)bus + aligned_size; | |
66 | } | |
46abc021 LB |
67 | |
68 | return bus; | |
298cf9be | 69 | } |
eb8a54a7 | 70 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 71 | |
46abc021 LB |
72 | /** |
73 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 74 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
75 | * |
76 | * Description: called when the last reference to an mii_bus is | |
77 | * dropped, to free the underlying memory. | |
78 | */ | |
79 | static void mdiobus_release(struct device *d) | |
80 | { | |
81 | struct mii_bus *bus = to_mii_bus(d); | |
161c8d2f KH |
82 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
83 | /* for compatibility with error handling in drivers */ | |
84 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
85 | kfree(bus); |
86 | } | |
87 | ||
88 | static struct class mdio_bus_class = { | |
89 | .name = "mdio_bus", | |
90 | .dev_release = mdiobus_release, | |
91 | }; | |
92 | ||
b943fbb0 | 93 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 | 94 | /* Helper function for of_mdio_find_bus */ |
9f3b795a | 95 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
25106022 DD |
96 | { |
97 | return dev->of_node == mdio_bus_np; | |
98 | } | |
99 | /** | |
100 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 101 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 DD |
102 | * |
103 | * Returns a pointer to the mii_bus, or NULL if none found. | |
104 | * | |
105 | * Because the association of a device_node and mii_bus is made via | |
106 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
107 | * registered with of_mdiobus_register(). | |
108 | * | |
109 | */ | |
110 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
111 | { | |
112 | struct device *d; | |
113 | ||
114 | if (!mdio_bus_np) | |
115 | return NULL; | |
116 | ||
117 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, | |
118 | of_mdio_bus_match); | |
119 | ||
120 | return d ? to_mii_bus(d) : NULL; | |
121 | } | |
122 | EXPORT_SYMBOL(of_mdio_find_bus); | |
123 | #endif | |
124 | ||
b3df0da8 RD |
125 | /** |
126 | * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus | |
127 | * @bus: target mii_bus | |
e1393456 | 128 | * |
b3df0da8 RD |
129 | * Description: Called by a bus driver to bring up all the PHYs |
130 | * on a given bus, and attach them to the bus. | |
131 | * | |
132 | * Returns 0 on success or < 0 on error. | |
e1393456 AF |
133 | */ |
134 | int mdiobus_register(struct mii_bus *bus) | |
135 | { | |
161c8d2f | 136 | int i, err; |
e1393456 | 137 | |
e1393456 | 138 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 139 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
140 | return -EINVAL; |
141 | ||
46abc021 LB |
142 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
143 | bus->state != MDIOBUS_UNREGISTERED); | |
144 | ||
145 | bus->dev.parent = bus->parent; | |
146 | bus->dev.class = &mdio_bus_class; | |
147 | bus->dev.groups = NULL; | |
036b6687 | 148 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 LB |
149 | |
150 | err = device_register(&bus->dev); | |
151 | if (err) { | |
8d242488 | 152 | pr_err("mii_bus %s failed to register\n", bus->id); |
46abc021 LB |
153 | return -EINVAL; |
154 | } | |
155 | ||
d1e7fe4d AB |
156 | mutex_init(&bus->mdio_lock); |
157 | ||
e1393456 AF |
158 | if (bus->reset) |
159 | bus->reset(bus); | |
160 | ||
161 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
4fd5f812 LB |
162 | if ((bus->phy_mask & (1 << i)) == 0) { |
163 | struct phy_device *phydev; | |
e1393456 | 164 | |
4fd5f812 | 165 | phydev = mdiobus_scan(bus, i); |
161c8d2f | 166 | if (IS_ERR(phydev)) { |
4fd5f812 | 167 | err = PTR_ERR(phydev); |
161c8d2f KH |
168 | goto error; |
169 | } | |
64b1c2b4 | 170 | } |
e1393456 AF |
171 | } |
172 | ||
161c8d2f | 173 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 174 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 175 | return 0; |
e1393456 | 176 | |
161c8d2f KH |
177 | error: |
178 | while (--i >= 0) { | |
179 | if (bus->phy_map[i]) | |
180 | device_unregister(&bus->phy_map[i]->dev); | |
181 | } | |
182 | device_del(&bus->dev); | |
e1393456 AF |
183 | return err; |
184 | } | |
185 | EXPORT_SYMBOL(mdiobus_register); | |
186 | ||
187 | void mdiobus_unregister(struct mii_bus *bus) | |
188 | { | |
189 | int i; | |
190 | ||
46abc021 LB |
191 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
192 | bus->state = MDIOBUS_UNREGISTERED; | |
193 | ||
3e44017b | 194 | device_del(&bus->dev); |
e1393456 | 195 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
6f4a7f41 | 196 | if (bus->phy_map[i]) |
e1393456 | 197 | device_unregister(&bus->phy_map[i]->dev); |
4dea547f | 198 | bus->phy_map[i] = NULL; |
e1393456 AF |
199 | } |
200 | } | |
201 | EXPORT_SYMBOL(mdiobus_unregister); | |
202 | ||
298cf9be LB |
203 | /** |
204 | * mdiobus_free - free a struct mii_bus | |
205 | * @bus: mii_bus to free | |
206 | * | |
46abc021 LB |
207 | * This function releases the reference to the underlying device |
208 | * object in the mii_bus. If this is the last reference, the mii_bus | |
209 | * will be freed. | |
298cf9be LB |
210 | */ |
211 | void mdiobus_free(struct mii_bus *bus) | |
212 | { | |
02d320c3 | 213 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
214 | if (bus->state == MDIOBUS_ALLOCATED) { |
215 | kfree(bus); | |
216 | return; | |
217 | } | |
218 | ||
219 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
220 | bus->state = MDIOBUS_RELEASED; | |
221 | ||
222 | put_device(&bus->dev); | |
298cf9be LB |
223 | } |
224 | EXPORT_SYMBOL(mdiobus_free); | |
225 | ||
4fd5f812 LB |
226 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
227 | { | |
228 | struct phy_device *phydev; | |
229 | int err; | |
230 | ||
ac28b9f8 | 231 | phydev = get_phy_device(bus, addr, false); |
4fd5f812 LB |
232 | if (IS_ERR(phydev) || phydev == NULL) |
233 | return phydev; | |
234 | ||
4dea547f | 235 | err = phy_device_register(phydev); |
4fd5f812 | 236 | if (err) { |
4fd5f812 | 237 | phy_device_free(phydev); |
4dea547f | 238 | return NULL; |
4fd5f812 LB |
239 | } |
240 | ||
4fd5f812 LB |
241 | return phydev; |
242 | } | |
243 | EXPORT_SYMBOL(mdiobus_scan); | |
244 | ||
2e888103 LB |
245 | /** |
246 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
247 | * @bus: the mii_bus struct | |
248 | * @addr: the phy address | |
249 | * @regnum: register number to read | |
250 | * | |
251 | * NOTE: MUST NOT be called from interrupt context, | |
252 | * because the bus read/write functions may wait for an interrupt | |
253 | * to conclude the operation. | |
254 | */ | |
abf35df2 | 255 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
256 | { |
257 | int retval; | |
258 | ||
259 | BUG_ON(in_interrupt()); | |
260 | ||
261 | mutex_lock(&bus->mdio_lock); | |
262 | retval = bus->read(bus, addr, regnum); | |
263 | mutex_unlock(&bus->mdio_lock); | |
264 | ||
265 | return retval; | |
266 | } | |
267 | EXPORT_SYMBOL(mdiobus_read); | |
268 | ||
269 | /** | |
270 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
271 | * @bus: the mii_bus struct | |
272 | * @addr: the phy address | |
273 | * @regnum: register number to write | |
274 | * @val: value to write to @regnum | |
275 | * | |
276 | * NOTE: MUST NOT be called from interrupt context, | |
277 | * because the bus read/write functions may wait for an interrupt | |
278 | * to conclude the operation. | |
279 | */ | |
abf35df2 | 280 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
281 | { |
282 | int err; | |
283 | ||
284 | BUG_ON(in_interrupt()); | |
285 | ||
286 | mutex_lock(&bus->mdio_lock); | |
287 | err = bus->write(bus, addr, regnum, val); | |
288 | mutex_unlock(&bus->mdio_lock); | |
289 | ||
290 | return err; | |
291 | } | |
292 | EXPORT_SYMBOL(mdiobus_write); | |
293 | ||
b3df0da8 RD |
294 | /** |
295 | * mdio_bus_match - determine if given PHY driver supports the given PHY device | |
296 | * @dev: target PHY device | |
297 | * @drv: given PHY driver | |
00db8189 | 298 | * |
b3df0da8 RD |
299 | * Description: Given a PHY device, and a PHY driver, return 1 if |
300 | * the driver supports the device. Otherwise, return 0. | |
00db8189 AF |
301 | */ |
302 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
303 | { | |
304 | struct phy_device *phydev = to_phy_device(dev); | |
305 | struct phy_driver *phydrv = to_phy_driver(drv); | |
306 | ||
a30e2c18 DD |
307 | if (of_driver_match_device(dev, drv)) |
308 | return 1; | |
309 | ||
310 | if (phydrv->match_phy_device) | |
311 | return phydrv->match_phy_device(phydev); | |
312 | ||
6f901b73 FF |
313 | return (phydrv->phy_id & phydrv->phy_id_mask) == |
314 | (phydev->phy_id & phydrv->phy_id_mask); | |
00db8189 AF |
315 | } |
316 | ||
2f5cb434 AV |
317 | #ifdef CONFIG_PM |
318 | ||
3d1e4db2 AV |
319 | static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) |
320 | { | |
321 | struct device_driver *drv = phydev->dev.driver; | |
322 | struct phy_driver *phydrv = to_phy_driver(drv); | |
323 | struct net_device *netdev = phydev->attached_dev; | |
324 | ||
325 | if (!drv || !phydrv->suspend) | |
326 | return false; | |
327 | ||
328 | /* PHY not attached? May suspend. */ | |
329 | if (!netdev) | |
330 | return true; | |
331 | ||
02d320c3 | 332 | /* Don't suspend PHY if the attched netdev parent may wakeup. |
3d1e4db2 AV |
333 | * The parent may point to a PCI device, as in tg3 driver. |
334 | */ | |
335 | if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) | |
336 | return false; | |
337 | ||
02d320c3 | 338 | /* Also don't suspend PHY if the netdev itself may wakeup. This |
3d1e4db2 AV |
339 | * is the case for devices w/o underlaying pwr. mgmt. aware bus, |
340 | * e.g. SoC devices. | |
341 | */ | |
342 | if (device_may_wakeup(&netdev->dev)) | |
343 | return false; | |
344 | ||
345 | return true; | |
346 | } | |
347 | ||
2f5cb434 | 348 | static int mdio_bus_suspend(struct device *dev) |
00db8189 | 349 | { |
3d1e4db2 | 350 | struct phy_driver *phydrv = to_phy_driver(dev->driver); |
0f0ca340 | 351 | struct phy_device *phydev = to_phy_device(dev); |
00db8189 | 352 | |
02d320c3 | 353 | /* We must stop the state machine manually, otherwise it stops out of |
541cd3ee AV |
354 | * control, possibly with the phydev->lock held. Upon resume, netdev |
355 | * may call phy routines that try to grab the same lock, and that may | |
356 | * lead to a deadlock. | |
357 | */ | |
fddd9101 | 358 | if (phydev->attached_dev && phydev->adjust_link) |
541cd3ee AV |
359 | phy_stop_machine(phydev); |
360 | ||
3d1e4db2 AV |
361 | if (!mdio_bus_phy_may_suspend(phydev)) |
362 | return 0; | |
541cd3ee | 363 | |
3d1e4db2 | 364 | return phydrv->suspend(phydev); |
00db8189 AF |
365 | } |
366 | ||
2f5cb434 | 367 | static int mdio_bus_resume(struct device *dev) |
00db8189 | 368 | { |
3d1e4db2 | 369 | struct phy_driver *phydrv = to_phy_driver(dev->driver); |
0f0ca340 | 370 | struct phy_device *phydev = to_phy_device(dev); |
541cd3ee | 371 | int ret; |
00db8189 | 372 | |
3d1e4db2 | 373 | if (!mdio_bus_phy_may_suspend(phydev)) |
541cd3ee AV |
374 | goto no_resume; |
375 | ||
376 | ret = phydrv->resume(phydev); | |
377 | if (ret < 0) | |
378 | return ret; | |
379 | ||
380 | no_resume: | |
fddd9101 | 381 | if (phydev->attached_dev && phydev->adjust_link) |
29935aeb | 382 | phy_start_machine(phydev); |
541cd3ee AV |
383 | |
384 | return 0; | |
00db8189 AF |
385 | } |
386 | ||
2f5cb434 AV |
387 | static int mdio_bus_restore(struct device *dev) |
388 | { | |
389 | struct phy_device *phydev = to_phy_device(dev); | |
390 | struct net_device *netdev = phydev->attached_dev; | |
391 | int ret; | |
392 | ||
393 | if (!netdev) | |
394 | return 0; | |
395 | ||
396 | ret = phy_init_hw(phydev); | |
397 | if (ret < 0) | |
398 | return ret; | |
399 | ||
400 | /* The PHY needs to renegotiate. */ | |
401 | phydev->link = 0; | |
402 | phydev->state = PHY_UP; | |
403 | ||
29935aeb | 404 | phy_start_machine(phydev); |
2f5cb434 AV |
405 | |
406 | return 0; | |
407 | } | |
408 | ||
02d320c3 | 409 | static const struct dev_pm_ops mdio_bus_pm_ops = { |
2f5cb434 AV |
410 | .suspend = mdio_bus_suspend, |
411 | .resume = mdio_bus_resume, | |
412 | .freeze = mdio_bus_suspend, | |
413 | .thaw = mdio_bus_resume, | |
414 | .restore = mdio_bus_restore, | |
415 | }; | |
416 | ||
417 | #define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops) | |
418 | ||
419 | #else | |
420 | ||
421 | #define MDIO_BUS_PM_OPS NULL | |
422 | ||
423 | #endif /* CONFIG_PM */ | |
424 | ||
56277f40 NB |
425 | static ssize_t |
426 | phy_id_show(struct device *dev, struct device_attribute *attr, char *buf) | |
427 | { | |
428 | struct phy_device *phydev = to_phy_device(dev); | |
429 | ||
430 | return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id); | |
431 | } | |
4192c749 | 432 | static DEVICE_ATTR_RO(phy_id); |
56277f40 | 433 | |
4192c749 GKH |
434 | static struct attribute *mdio_dev_attrs[] = { |
435 | &dev_attr_phy_id.attr, | |
436 | NULL, | |
56277f40 | 437 | }; |
4192c749 | 438 | ATTRIBUTE_GROUPS(mdio_dev); |
56277f40 | 439 | |
00db8189 AF |
440 | struct bus_type mdio_bus_type = { |
441 | .name = "mdio_bus", | |
442 | .match = mdio_bus_match, | |
2f5cb434 | 443 | .pm = MDIO_BUS_PM_OPS, |
4192c749 | 444 | .dev_groups = mdio_dev_groups, |
00db8189 | 445 | }; |
11b0bacd | 446 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 447 | |
67c4f3fa | 448 | int __init mdio_bus_init(void) |
00db8189 | 449 | { |
46abc021 LB |
450 | int ret; |
451 | ||
452 | ret = class_register(&mdio_bus_class); | |
453 | if (!ret) { | |
454 | ret = bus_register(&mdio_bus_type); | |
455 | if (ret) | |
456 | class_unregister(&mdio_bus_class); | |
457 | } | |
458 | ||
459 | return ret; | |
00db8189 AF |
460 | } |
461 | ||
dc85dec6 | 462 | void mdio_bus_exit(void) |
e1393456 | 463 | { |
46abc021 | 464 | class_unregister(&mdio_bus_class); |
e1393456 AF |
465 | bus_unregister(&mdio_bus_type); |
466 | } |