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a2443fd1 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
02d320c3 | 2 | /* MDIO Bus interface |
00db8189 AF |
3 | * |
4 | * Author: Andy Fleming | |
5 | * | |
6 | * Copyright (c) 2004 Freescale Semiconductor, Inc. | |
00db8189 | 7 | */ |
8d242488 JP |
8 | |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
00db8189 | 11 | #include <linux/delay.h> |
3d1e4db2 | 12 | #include <linux/device.h> |
54e80ded BG |
13 | #include <linux/errno.h> |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/ethtool.h> | |
69226896 RQ |
16 | #include <linux/gpio.h> |
17 | #include <linux/gpio/consumer.h> | |
54e80ded BG |
18 | #include <linux/init.h> |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mii.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/netdevice.h> | |
a30e2c18 | 26 | #include <linux/of_device.h> |
69226896 | 27 | #include <linux/of_gpio.h> |
54e80ded BG |
28 | #include <linux/of_mdio.h> |
29 | #include <linux/phy.h> | |
71dd6c0d | 30 | #include <linux/reset.h> |
00db8189 | 31 | #include <linux/skbuff.h> |
54e80ded | 32 | #include <linux/slab.h> |
00db8189 | 33 | #include <linux/spinlock.h> |
54e80ded | 34 | #include <linux/string.h> |
02d320c3 | 35 | #include <linux/uaccess.h> |
54e80ded | 36 | #include <linux/unistd.h> |
00db8189 | 37 | |
e22e996b UKK |
38 | #define CREATE_TRACE_POINTS |
39 | #include <trace/events/mdio.h> | |
40 | ||
648ea013 FF |
41 | #include "mdio-boardinfo.h" |
42 | ||
ee7e16b6 | 43 | static int mdiobus_register_gpiod(struct mdio_device *mdiodev) |
7f854420 | 44 | { |
bafbdd52 | 45 | /* Deassert the optional reset signal */ |
40ba6a12 DT |
46 | mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev, |
47 | "reset", GPIOD_OUT_LOW); | |
d0f0c55e TB |
48 | if (IS_ERR(mdiodev->reset_gpio)) |
49 | return PTR_ERR(mdiodev->reset_gpio); | |
40ba6a12 DT |
50 | |
51 | if (mdiodev->reset_gpio) | |
52 | gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset"); | |
bafbdd52 | 53 | |
71dd6c0d DB |
54 | return 0; |
55 | } | |
56 | ||
57 | static int mdiobus_register_reset(struct mdio_device *mdiodev) | |
58 | { | |
62140036 GU |
59 | struct reset_control *reset; |
60 | ||
61 | reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy"); | |
62 | if (IS_ERR(reset)) | |
63 | return PTR_ERR(reset); | |
71dd6c0d DB |
64 | |
65 | mdiodev->reset_ctrl = reset; | |
bafbdd52 | 66 | |
ee7e16b6 AL |
67 | return 0; |
68 | } | |
69 | ||
70 | int mdiobus_register_device(struct mdio_device *mdiodev) | |
71 | { | |
72 | int err; | |
73 | ||
74 | if (mdiodev->bus->mdio_map[mdiodev->addr]) | |
75 | return -EBUSY; | |
76 | ||
77 | if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) { | |
78 | err = mdiobus_register_gpiod(mdiodev); | |
79 | if (err) | |
80 | return err; | |
71dd6c0d DB |
81 | |
82 | err = mdiobus_register_reset(mdiodev); | |
83 | if (err) | |
84 | return err; | |
85 | ||
86 | /* Assert the reset signal */ | |
87 | mdio_device_reset(mdiodev, 1); | |
ee7e16b6 AL |
88 | } |
89 | ||
7f854420 AL |
90 | mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev; |
91 | ||
92 | return 0; | |
93 | } | |
94 | EXPORT_SYMBOL(mdiobus_register_device); | |
95 | ||
96 | int mdiobus_unregister_device(struct mdio_device *mdiodev) | |
97 | { | |
98 | if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev) | |
99 | return -EINVAL; | |
100 | ||
32085f25 DB |
101 | reset_control_put(mdiodev->reset_ctrl); |
102 | ||
7f854420 AL |
103 | mdiodev->bus->mdio_map[mdiodev->addr] = NULL; |
104 | ||
105 | return 0; | |
106 | } | |
107 | EXPORT_SYMBOL(mdiobus_unregister_device); | |
108 | ||
109 | struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr) | |
110 | { | |
111 | struct mdio_device *mdiodev = bus->mdio_map[addr]; | |
112 | ||
113 | if (!mdiodev) | |
114 | return NULL; | |
115 | ||
116 | if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY)) | |
117 | return NULL; | |
118 | ||
119 | return container_of(mdiodev, struct phy_device, mdio); | |
120 | } | |
121 | EXPORT_SYMBOL(mdiobus_get_phy); | |
122 | ||
123 | bool mdiobus_is_registered_device(struct mii_bus *bus, int addr) | |
124 | { | |
125 | return bus->mdio_map[addr]; | |
126 | } | |
127 | EXPORT_SYMBOL(mdiobus_is_registered_device); | |
128 | ||
298cf9be | 129 | /** |
eb8a54a7 | 130 | * mdiobus_alloc_size - allocate a mii_bus structure |
af58f1d6 RD |
131 | * @size: extra amount of memory to allocate for private storage. |
132 | * If non-zero, then bus->priv is points to that memory. | |
298cf9be LB |
133 | * |
134 | * Description: called by a bus driver to allocate an mii_bus | |
135 | * structure to fill in. | |
136 | */ | |
eb8a54a7 | 137 | struct mii_bus *mdiobus_alloc_size(size_t size) |
298cf9be | 138 | { |
46abc021 | 139 | struct mii_bus *bus; |
eb8a54a7 TT |
140 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
141 | size_t alloc_size; | |
e7f4dc35 | 142 | int i; |
eb8a54a7 TT |
143 | |
144 | /* If we alloc extra space, it should be aligned */ | |
145 | if (size) | |
146 | alloc_size = aligned_size + size; | |
147 | else | |
148 | alloc_size = sizeof(*bus); | |
46abc021 | 149 | |
eb8a54a7 | 150 | bus = kzalloc(alloc_size, GFP_KERNEL); |
db9107b4 DC |
151 | if (!bus) |
152 | return NULL; | |
153 | ||
154 | bus->state = MDIOBUS_ALLOCATED; | |
155 | if (size) | |
156 | bus->priv = (void *)bus + aligned_size; | |
46abc021 | 157 | |
080bb352 FF |
158 | /* Initialise the interrupts to polling and 64-bit seqcounts */ |
159 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
e7f4dc35 | 160 | bus->irq[i] = PHY_POLL; |
080bb352 FF |
161 | u64_stats_init(&bus->stats[i].syncp); |
162 | } | |
e7f4dc35 | 163 | |
46abc021 | 164 | return bus; |
298cf9be | 165 | } |
eb8a54a7 | 166 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 167 | |
46abc021 LB |
168 | /** |
169 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 170 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
171 | * |
172 | * Description: called when the last reference to an mii_bus is | |
173 | * dropped, to free the underlying memory. | |
174 | */ | |
175 | static void mdiobus_release(struct device *d) | |
176 | { | |
177 | struct mii_bus *bus = to_mii_bus(d); | |
775f2547 | 178 | |
161c8d2f KH |
179 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
180 | /* for compatibility with error handling in drivers */ | |
181 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
182 | kfree(bus); |
183 | } | |
184 | ||
080bb352 FF |
185 | struct mdio_bus_stat_attr { |
186 | int addr; | |
187 | unsigned int field_offset; | |
188 | }; | |
189 | ||
190 | static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset) | |
191 | { | |
192 | const char *p = (const char *)s + offset; | |
193 | unsigned int start; | |
194 | u64 val = 0; | |
195 | ||
196 | do { | |
197 | start = u64_stats_fetch_begin(&s->syncp); | |
198 | val = u64_stats_read((const u64_stats_t *)p); | |
199 | } while (u64_stats_fetch_retry(&s->syncp, start)); | |
200 | ||
201 | return val; | |
202 | } | |
203 | ||
204 | static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset) | |
205 | { | |
206 | unsigned int i; | |
207 | u64 val = 0; | |
208 | ||
209 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
210 | val += mdio_bus_get_stat(&bus->stats[i], offset); | |
211 | ||
212 | return val; | |
213 | } | |
214 | ||
215 | static ssize_t mdio_bus_stat_field_show(struct device *dev, | |
216 | struct device_attribute *attr, | |
217 | char *buf) | |
218 | { | |
219 | struct mii_bus *bus = to_mii_bus(dev); | |
220 | struct mdio_bus_stat_attr *sattr; | |
221 | struct dev_ext_attribute *eattr; | |
222 | u64 val; | |
223 | ||
224 | eattr = container_of(attr, struct dev_ext_attribute, attr); | |
225 | sattr = eattr->var; | |
226 | ||
227 | if (sattr->addr < 0) | |
228 | val = mdio_bus_get_global_stat(bus, sattr->field_offset); | |
229 | else | |
230 | val = mdio_bus_get_stat(&bus->stats[sattr->addr], | |
231 | sattr->field_offset); | |
232 | ||
233 | return sprintf(buf, "%llu\n", val); | |
234 | } | |
235 | ||
236 | static ssize_t mdio_bus_device_stat_field_show(struct device *dev, | |
237 | struct device_attribute *attr, | |
238 | char *buf) | |
239 | { | |
240 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
241 | struct mii_bus *bus = mdiodev->bus; | |
242 | struct mdio_bus_stat_attr *sattr; | |
243 | struct dev_ext_attribute *eattr; | |
244 | int addr = mdiodev->addr; | |
245 | u64 val; | |
246 | ||
247 | eattr = container_of(attr, struct dev_ext_attribute, attr); | |
248 | sattr = eattr->var; | |
249 | ||
250 | val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset); | |
251 | ||
252 | return sprintf(buf, "%llu\n", val); | |
253 | } | |
254 | ||
255 | #define MDIO_BUS_STATS_ATTR_DECL(field, file) \ | |
256 | static struct dev_ext_attribute dev_attr_mdio_bus_##field = { \ | |
257 | .attr = { .attr = { .name = file, .mode = 0444 }, \ | |
258 | .show = mdio_bus_stat_field_show, \ | |
259 | }, \ | |
260 | .var = &((struct mdio_bus_stat_attr) { \ | |
261 | -1, offsetof(struct mdio_bus_stats, field) \ | |
262 | }), \ | |
263 | }; \ | |
264 | static struct dev_ext_attribute dev_attr_mdio_bus_device_##field = { \ | |
265 | .attr = { .attr = { .name = file, .mode = 0444 }, \ | |
266 | .show = mdio_bus_device_stat_field_show, \ | |
267 | }, \ | |
268 | .var = &((struct mdio_bus_stat_attr) { \ | |
269 | -1, offsetof(struct mdio_bus_stats, field) \ | |
270 | }), \ | |
271 | }; | |
272 | ||
273 | #define MDIO_BUS_STATS_ATTR(field) \ | |
274 | MDIO_BUS_STATS_ATTR_DECL(field, __stringify(field)) | |
275 | ||
276 | MDIO_BUS_STATS_ATTR(transfers); | |
277 | MDIO_BUS_STATS_ATTR(errors); | |
278 | MDIO_BUS_STATS_ATTR(writes); | |
279 | MDIO_BUS_STATS_ATTR(reads); | |
280 | ||
281 | #define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file) \ | |
282 | static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \ | |
283 | .attr = { .attr = { .name = file, .mode = 0444 }, \ | |
284 | .show = mdio_bus_stat_field_show, \ | |
285 | }, \ | |
286 | .var = &((struct mdio_bus_stat_attr) { \ | |
287 | addr, offsetof(struct mdio_bus_stats, field) \ | |
288 | }), \ | |
289 | } | |
290 | ||
291 | #define MDIO_BUS_STATS_ADDR_ATTR(field, addr) \ | |
292 | MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, \ | |
293 | __stringify(field) "_" __stringify(addr)) | |
294 | ||
295 | #define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr) \ | |
296 | MDIO_BUS_STATS_ADDR_ATTR(transfers, addr); \ | |
297 | MDIO_BUS_STATS_ADDR_ATTR(errors, addr); \ | |
298 | MDIO_BUS_STATS_ADDR_ATTR(writes, addr); \ | |
299 | MDIO_BUS_STATS_ADDR_ATTR(reads, addr) \ | |
300 | ||
301 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0); | |
302 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1); | |
303 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2); | |
304 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3); | |
305 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4); | |
306 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5); | |
307 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6); | |
308 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7); | |
309 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8); | |
310 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9); | |
311 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10); | |
312 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11); | |
313 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12); | |
314 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13); | |
315 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14); | |
316 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15); | |
317 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16); | |
318 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17); | |
319 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18); | |
320 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19); | |
321 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20); | |
322 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21); | |
323 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22); | |
324 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23); | |
325 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24); | |
326 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25); | |
327 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26); | |
328 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27); | |
329 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28); | |
330 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29); | |
331 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30); | |
332 | MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31); | |
333 | ||
334 | #define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr) \ | |
335 | &dev_attr_mdio_bus_addr_transfers_##addr.attr.attr, \ | |
336 | &dev_attr_mdio_bus_addr_errors_##addr.attr.attr, \ | |
337 | &dev_attr_mdio_bus_addr_writes_##addr.attr.attr, \ | |
338 | &dev_attr_mdio_bus_addr_reads_##addr.attr.attr \ | |
339 | ||
340 | static struct attribute *mdio_bus_statistics_attrs[] = { | |
341 | &dev_attr_mdio_bus_transfers.attr.attr, | |
342 | &dev_attr_mdio_bus_errors.attr.attr, | |
343 | &dev_attr_mdio_bus_writes.attr.attr, | |
344 | &dev_attr_mdio_bus_reads.attr.attr, | |
345 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(0), | |
346 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(1), | |
347 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(2), | |
348 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(3), | |
349 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(4), | |
350 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(5), | |
351 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(6), | |
352 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(7), | |
353 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(8), | |
354 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(9), | |
355 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(10), | |
356 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(11), | |
357 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(12), | |
358 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(13), | |
359 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(14), | |
360 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(15), | |
361 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(16), | |
362 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(17), | |
363 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(18), | |
364 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(19), | |
365 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(20), | |
366 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(21), | |
367 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(22), | |
368 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(23), | |
369 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(24), | |
370 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(25), | |
371 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(26), | |
372 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(27), | |
373 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(28), | |
374 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(29), | |
375 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(30), | |
376 | MDIO_BUS_STATS_ADDR_ATTR_GROUP(31), | |
377 | NULL, | |
378 | }; | |
379 | ||
380 | static const struct attribute_group mdio_bus_statistics_group = { | |
381 | .name = "statistics", | |
382 | .attrs = mdio_bus_statistics_attrs, | |
383 | }; | |
384 | ||
385 | static const struct attribute_group *mdio_bus_groups[] = { | |
386 | &mdio_bus_statistics_group, | |
387 | NULL, | |
388 | }; | |
389 | ||
46abc021 LB |
390 | static struct class mdio_bus_class = { |
391 | .name = "mdio_bus", | |
392 | .dev_release = mdiobus_release, | |
080bb352 | 393 | .dev_groups = mdio_bus_groups, |
46abc021 LB |
394 | }; |
395 | ||
ce69e216 JL |
396 | /** |
397 | * mdio_find_bus - Given the name of a mdiobus, find the mii_bus. | |
ab741102 | 398 | * @mdio_name: The name of a mdiobus. |
ce69e216 JL |
399 | * |
400 | * Returns a reference to the mii_bus, or NULL if none found. The | |
401 | * embedded struct device will have its reference count incremented, | |
402 | * and this must be put_deviced'ed once the bus is finished with. | |
403 | */ | |
404 | struct mii_bus *mdio_find_bus(const char *mdio_name) | |
405 | { | |
406 | struct device *d; | |
407 | ||
408 | d = class_find_device_by_name(&mdio_bus_class, mdio_name); | |
409 | return d ? to_mii_bus(d) : NULL; | |
410 | } | |
411 | EXPORT_SYMBOL(mdio_find_bus); | |
412 | ||
b943fbb0 | 413 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 DD |
414 | /** |
415 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 416 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 | 417 | * |
a1364421 RK |
418 | * Returns a reference to the mii_bus, or NULL if none found. The |
419 | * embedded struct device will have its reference count incremented, | |
420 | * and this must be put once the bus is finished with. | |
25106022 DD |
421 | * |
422 | * Because the association of a device_node and mii_bus is made via | |
423 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
424 | * registered with of_mdiobus_register(). | |
425 | * | |
426 | */ | |
427 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
428 | { | |
429 | struct device *d; | |
430 | ||
431 | if (!mdio_bus_np) | |
432 | return NULL; | |
433 | ||
cfba5de9 | 434 | d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np); |
25106022 DD |
435 | return d ? to_mii_bus(d) : NULL; |
436 | } | |
437 | EXPORT_SYMBOL(of_mdio_find_bus); | |
d9daa247 | 438 | |
f03bc4ae AL |
439 | /* Walk the list of subnodes of a mdio bus and look for a node that |
440 | * matches the mdio device's address with its 'reg' property. If | |
441 | * found, set the of_node pointer for the mdio device. This allows | |
442 | * auto-probed phy devices to be supplied with information passed in | |
443 | * via DT. | |
d9daa247 | 444 | */ |
f03bc4ae AL |
445 | static void of_mdiobus_link_mdiodev(struct mii_bus *bus, |
446 | struct mdio_device *mdiodev) | |
d9daa247 | 447 | { |
f03bc4ae | 448 | struct device *dev = &mdiodev->dev; |
d9daa247 DM |
449 | struct device_node *child; |
450 | ||
e5a03bfd | 451 | if (dev->of_node || !bus->dev.of_node) |
d9daa247 DM |
452 | return; |
453 | ||
e5a03bfd | 454 | for_each_available_child_of_node(bus->dev.of_node, child) { |
d9daa247 | 455 | int addr; |
d9daa247 | 456 | |
d0a65400 JM |
457 | addr = of_mdio_parse_addr(dev, child); |
458 | if (addr < 0) | |
d9daa247 | 459 | continue; |
d9daa247 | 460 | |
f03bc4ae | 461 | if (addr == mdiodev->addr) { |
7e33d84d | 462 | device_set_node(dev, of_fwnode_handle(child)); |
d9daa247 DM |
463 | return; |
464 | } | |
465 | } | |
466 | } | |
467 | #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ | |
f03bc4ae AL |
468 | static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
469 | struct mdio_device *mdiodev) | |
d9daa247 DM |
470 | { |
471 | } | |
25106022 DD |
472 | #endif |
473 | ||
d0281a56 | 474 | /** |
69280228 | 475 | * mdiobus_create_device - create a full MDIO device given |
d0281a56 FF |
476 | * a mdio_board_info structure |
477 | * @bus: MDIO bus to create the devices on | |
478 | * @bi: mdio_board_info structure describing the devices | |
479 | * | |
480 | * Returns 0 on success or < 0 on error. | |
481 | */ | |
482 | static int mdiobus_create_device(struct mii_bus *bus, | |
483 | struct mdio_board_info *bi) | |
484 | { | |
485 | struct mdio_device *mdiodev; | |
486 | int ret = 0; | |
487 | ||
488 | mdiodev = mdio_device_create(bus, bi->mdio_addr); | |
489 | if (IS_ERR(mdiodev)) | |
490 | return -ENODEV; | |
491 | ||
492 | strncpy(mdiodev->modalias, bi->modalias, | |
493 | sizeof(mdiodev->modalias)); | |
494 | mdiodev->bus_match = mdio_device_bus_match; | |
495 | mdiodev->dev.platform_data = (void *)bi->platform_data; | |
496 | ||
497 | ret = mdio_device_register(mdiodev); | |
498 | if (ret) | |
499 | mdio_device_free(mdiodev); | |
500 | ||
501 | return ret; | |
502 | } | |
503 | ||
b3df0da8 | 504 | /** |
59f06978 | 505 | * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
b3df0da8 | 506 | * @bus: target mii_bus |
59f06978 | 507 | * @owner: module containing bus accessor functions |
e1393456 | 508 | * |
b3df0da8 | 509 | * Description: Called by a bus driver to bring up all the PHYs |
59f06978 RK |
510 | * on a given bus, and attach them to the bus. Drivers should use |
511 | * mdiobus_register() rather than __mdiobus_register() unless they | |
f89df3f3 | 512 | * need to pass a specific owner module. MDIO devices which are not |
fec76125 | 513 | * PHYs will not be brought up by this function. They are expected |
f89df3f3 | 514 | * to be explicitly listed in DT and instantiated by of_mdiobus_register(). |
b3df0da8 RD |
515 | * |
516 | * Returns 0 on success or < 0 on error. | |
e1393456 | 517 | */ |
3e3aaf64 | 518 | int __mdiobus_register(struct mii_bus *bus, struct module *owner) |
e1393456 | 519 | { |
711fdba3 | 520 | struct mdio_device *mdiodev; |
161c8d2f | 521 | int i, err; |
69226896 | 522 | struct gpio_desc *gpiod; |
e1393456 | 523 | |
e1393456 | 524 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 525 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
526 | return -EINVAL; |
527 | ||
04f41c68 SK |
528 | if (bus->parent && bus->parent->of_node) |
529 | bus->parent->of_node->fwnode.flags |= | |
530 | FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD; | |
531 | ||
46abc021 LB |
532 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
533 | bus->state != MDIOBUS_UNREGISTERED); | |
534 | ||
3e3aaf64 | 535 | bus->owner = owner; |
46abc021 LB |
536 | bus->dev.parent = bus->parent; |
537 | bus->dev.class = &mdio_bus_class; | |
538 | bus->dev.groups = NULL; | |
036b6687 | 539 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 | 540 | |
ca6e11c3 PS |
541 | /* We need to set state to MDIOBUS_UNREGISTERED to correctly release |
542 | * the device in mdiobus_free() | |
543 | * | |
544 | * State will be updated later in this function in case of success | |
545 | */ | |
546 | bus->state = MDIOBUS_UNREGISTERED; | |
547 | ||
46abc021 LB |
548 | err = device_register(&bus->dev); |
549 | if (err) { | |
8d242488 | 550 | pr_err("mii_bus %s failed to register\n", bus->id); |
46abc021 LB |
551 | return -EINVAL; |
552 | } | |
553 | ||
d1e7fe4d | 554 | mutex_init(&bus->mdio_lock); |
63490847 | 555 | mutex_init(&bus->shared_lock); |
d1e7fe4d | 556 | |
e0183b97 ML |
557 | /* assert bus level PHY GPIO reset */ |
558 | gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH); | |
d396e84c | 559 | if (IS_ERR(gpiod)) { |
0a12ad59 GS |
560 | err = dev_err_probe(&bus->dev, PTR_ERR(gpiod), |
561 | "mii_bus %s couldn't get reset GPIO\n", | |
562 | bus->id); | |
e40e2a2e | 563 | device_del(&bus->dev); |
0a12ad59 | 564 | return err; |
fe0e4052 | 565 | } else if (gpiod) { |
d396e84c | 566 | bus->reset_gpiod = gpiod; |
6259e0f5 | 567 | fsleep(bus->reset_delay_us); |
d396e84c | 568 | gpiod_set_value_cansleep(gpiod, 0); |
bb383129 BT |
569 | if (bus->reset_post_delay_us > 0) |
570 | fsleep(bus->reset_post_delay_us); | |
69226896 RQ |
571 | } |
572 | ||
c290d1ab FF |
573 | if (bus->reset) { |
574 | err = bus->reset(bus); | |
575 | if (err) | |
576 | goto error_reset_gpiod; | |
577 | } | |
df0c8d91 | 578 | |
e1393456 | 579 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
4fd5f812 LB |
580 | if ((bus->phy_mask & (1 << i)) == 0) { |
581 | struct phy_device *phydev; | |
e1393456 | 582 | |
4fd5f812 | 583 | phydev = mdiobus_scan(bus, i); |
70e927b9 | 584 | if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) { |
4fd5f812 | 585 | err = PTR_ERR(phydev); |
161c8d2f KH |
586 | goto error; |
587 | } | |
64b1c2b4 | 588 | } |
e1393456 AF |
589 | } |
590 | ||
d0281a56 | 591 | mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device); |
648ea013 | 592 | |
161c8d2f | 593 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 594 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 595 | return 0; |
e1393456 | 596 | |
161c8d2f KH |
597 | error: |
598 | while (--i >= 0) { | |
711fdba3 AL |
599 | mdiodev = bus->mdio_map[i]; |
600 | if (!mdiodev) | |
601 | continue; | |
602 | ||
603 | mdiodev->device_remove(mdiodev); | |
604 | mdiodev->device_free(mdiodev); | |
161c8d2f | 605 | } |
c290d1ab | 606 | error_reset_gpiod: |
69226896 | 607 | /* Put PHYs in RESET to save power */ |
a010a2f6 FF |
608 | if (bus->reset_gpiod) |
609 | gpiod_set_value_cansleep(bus->reset_gpiod, 1); | |
69226896 | 610 | |
161c8d2f | 611 | device_del(&bus->dev); |
e1393456 AF |
612 | return err; |
613 | } | |
3e3aaf64 | 614 | EXPORT_SYMBOL(__mdiobus_register); |
e1393456 AF |
615 | |
616 | void mdiobus_unregister(struct mii_bus *bus) | |
617 | { | |
a9049e0c | 618 | struct mdio_device *mdiodev; |
e1393456 AF |
619 | int i; |
620 | ||
1dde47a6 DC |
621 | if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED)) |
622 | return; | |
46abc021 LB |
623 | bus->state = MDIOBUS_UNREGISTERED; |
624 | ||
e1393456 | 625 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
a9049e0c AL |
626 | mdiodev = bus->mdio_map[i]; |
627 | if (!mdiodev) | |
628 | continue; | |
629 | ||
6110ed2d DB |
630 | if (mdiodev->reset_gpio) |
631 | gpiod_put(mdiodev->reset_gpio); | |
bafbdd52 | 632 | |
711fdba3 AL |
633 | mdiodev->device_remove(mdiodev); |
634 | mdiodev->device_free(mdiodev); | |
e1393456 | 635 | } |
69226896 RQ |
636 | |
637 | /* Put PHYs in RESET to save power */ | |
a010a2f6 FF |
638 | if (bus->reset_gpiod) |
639 | gpiod_set_value_cansleep(bus->reset_gpiod, 1); | |
69226896 | 640 | |
b6c6aedc | 641 | device_del(&bus->dev); |
e1393456 AF |
642 | } |
643 | EXPORT_SYMBOL(mdiobus_unregister); | |
644 | ||
298cf9be LB |
645 | /** |
646 | * mdiobus_free - free a struct mii_bus | |
647 | * @bus: mii_bus to free | |
648 | * | |
46abc021 LB |
649 | * This function releases the reference to the underlying device |
650 | * object in the mii_bus. If this is the last reference, the mii_bus | |
651 | * will be freed. | |
298cf9be LB |
652 | */ |
653 | void mdiobus_free(struct mii_bus *bus) | |
654 | { | |
02d320c3 | 655 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
656 | if (bus->state == MDIOBUS_ALLOCATED) { |
657 | kfree(bus); | |
658 | return; | |
659 | } | |
660 | ||
661 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
662 | bus->state = MDIOBUS_RELEASED; | |
663 | ||
664 | put_device(&bus->dev); | |
298cf9be LB |
665 | } |
666 | EXPORT_SYMBOL(mdiobus_free); | |
667 | ||
f89df3f3 AL |
668 | /** |
669 | * mdiobus_scan - scan a bus for MDIO devices. | |
670 | * @bus: mii_bus to scan | |
671 | * @addr: address on bus to scan | |
672 | * | |
673 | * This function scans the MDIO bus, looking for devices which can be | |
674 | * identified using a vendor/product ID in registers 2 and 3. Not all | |
675 | * MDIO devices have such registers, but PHY devices typically | |
676 | * do. Hence this function assumes anything found is a PHY, or can be | |
677 | * treated as a PHY. Other MDIO devices, such as switches, will | |
678 | * probably not be found during the scan. | |
679 | */ | |
4fd5f812 LB |
680 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
681 | { | |
0cc8fecf | 682 | struct phy_device *phydev = ERR_PTR(-ENODEV); |
4fd5f812 LB |
683 | int err; |
684 | ||
0cc8fecf JL |
685 | switch (bus->probe_capabilities) { |
686 | case MDIOBUS_NO_CAP: | |
687 | case MDIOBUS_C22: | |
688 | phydev = get_phy_device(bus, addr, false); | |
689 | break; | |
690 | case MDIOBUS_C45: | |
691 | phydev = get_phy_device(bus, addr, true); | |
692 | break; | |
693 | case MDIOBUS_C22_C45: | |
694 | phydev = get_phy_device(bus, addr, false); | |
695 | if (IS_ERR(phydev)) | |
696 | phydev = get_phy_device(bus, addr, true); | |
697 | break; | |
698 | } | |
699 | ||
66c239e7 | 700 | if (IS_ERR(phydev)) |
4fd5f812 LB |
701 | return phydev; |
702 | ||
86f6cf41 DM |
703 | /* |
704 | * For DT, see if the auto-probed phy has a correspoding child | |
705 | * in the bus node, and set the of_node pointer in this case. | |
706 | */ | |
f03bc4ae | 707 | of_mdiobus_link_mdiodev(bus, &phydev->mdio); |
86f6cf41 | 708 | |
4dea547f | 709 | err = phy_device_register(phydev); |
4fd5f812 | 710 | if (err) { |
4fd5f812 | 711 | phy_device_free(phydev); |
e98a3aab | 712 | return ERR_PTR(-ENODEV); |
4fd5f812 LB |
713 | } |
714 | ||
4fd5f812 LB |
715 | return phydev; |
716 | } | |
717 | EXPORT_SYMBOL(mdiobus_scan); | |
718 | ||
080bb352 FF |
719 | static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret) |
720 | { | |
c7e261d8 | 721 | preempt_disable(); |
080bb352 FF |
722 | u64_stats_update_begin(&stats->syncp); |
723 | ||
724 | u64_stats_inc(&stats->transfers); | |
725 | if (ret < 0) { | |
726 | u64_stats_inc(&stats->errors); | |
727 | goto out; | |
728 | } | |
729 | ||
730 | if (op) | |
731 | u64_stats_inc(&stats->reads); | |
732 | else | |
733 | u64_stats_inc(&stats->writes); | |
734 | out: | |
735 | u64_stats_update_end(&stats->syncp); | |
c7e261d8 | 736 | preempt_enable(); |
080bb352 FF |
737 | } |
738 | ||
34dc08e4 RK |
739 | /** |
740 | * __mdiobus_read - Unlocked version of the mdiobus_read function | |
741 | * @bus: the mii_bus struct | |
742 | * @addr: the phy address | |
743 | * @regnum: register number to read | |
744 | * | |
745 | * Read a MDIO bus register. Caller must hold the mdio bus lock. | |
746 | * | |
747 | * NOTE: MUST NOT be called from interrupt context. | |
748 | */ | |
749 | int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) | |
750 | { | |
751 | int retval; | |
752 | ||
e6e918d4 | 753 | lockdep_assert_held_once(&bus->mdio_lock); |
34dc08e4 RK |
754 | |
755 | retval = bus->read(bus, addr, regnum); | |
756 | ||
757 | trace_mdio_access(bus, 1, addr, regnum, retval, retval); | |
080bb352 | 758 | mdiobus_stats_acct(&bus->stats[addr], true, retval); |
34dc08e4 RK |
759 | |
760 | return retval; | |
761 | } | |
762 | EXPORT_SYMBOL(__mdiobus_read); | |
763 | ||
764 | /** | |
765 | * __mdiobus_write - Unlocked version of the mdiobus_write function | |
766 | * @bus: the mii_bus struct | |
767 | * @addr: the phy address | |
768 | * @regnum: register number to write | |
769 | * @val: value to write to @regnum | |
770 | * | |
771 | * Write a MDIO bus register. Caller must hold the mdio bus lock. | |
772 | * | |
773 | * NOTE: MUST NOT be called from interrupt context. | |
774 | */ | |
775 | int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
776 | { | |
777 | int err; | |
778 | ||
e6e918d4 | 779 | lockdep_assert_held_once(&bus->mdio_lock); |
34dc08e4 RK |
780 | |
781 | err = bus->write(bus, addr, regnum, val); | |
782 | ||
783 | trace_mdio_access(bus, 0, addr, regnum, val, err); | |
080bb352 | 784 | mdiobus_stats_acct(&bus->stats[addr], false, err); |
34dc08e4 RK |
785 | |
786 | return err; | |
787 | } | |
788 | EXPORT_SYMBOL(__mdiobus_write); | |
789 | ||
6cc7cf81 RK |
790 | /** |
791 | * __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function | |
792 | * @bus: the mii_bus struct | |
793 | * @addr: the phy address | |
794 | * @regnum: register number to modify | |
795 | * @mask: bit mask of bits to clear | |
796 | * @set: bit mask of bits to set | |
797 | * | |
798 | * Read, modify, and if any change, write the register value back to the | |
799 | * device. Any error returns a negative number. | |
800 | * | |
801 | * NOTE: MUST NOT be called from interrupt context. | |
802 | */ | |
803 | int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum, | |
804 | u16 mask, u16 set) | |
805 | { | |
806 | int new, ret; | |
807 | ||
808 | ret = __mdiobus_read(bus, addr, regnum); | |
809 | if (ret < 0) | |
810 | return ret; | |
811 | ||
812 | new = (ret & ~mask) | set; | |
813 | if (new == ret) | |
814 | return 0; | |
815 | ||
816 | ret = __mdiobus_write(bus, addr, regnum, new); | |
817 | ||
818 | return ret < 0 ? ret : 1; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(__mdiobus_modify_changed); | |
821 | ||
21dd19fe NA |
822 | /** |
823 | * mdiobus_read_nested - Nested version of the mdiobus_read function | |
824 | * @bus: the mii_bus struct | |
825 | * @addr: the phy address | |
826 | * @regnum: register number to read | |
827 | * | |
828 | * In case of nested MDIO bus access avoid lockdep false positives by | |
829 | * using mutex_lock_nested(). | |
830 | * | |
831 | * NOTE: MUST NOT be called from interrupt context, | |
832 | * because the bus read/write functions may wait for an interrupt | |
833 | * to conclude the operation. | |
834 | */ | |
835 | int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) | |
836 | { | |
837 | int retval; | |
838 | ||
9a6f2b01 | 839 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
34dc08e4 | 840 | retval = __mdiobus_read(bus, addr, regnum); |
21dd19fe NA |
841 | mutex_unlock(&bus->mdio_lock); |
842 | ||
843 | return retval; | |
844 | } | |
845 | EXPORT_SYMBOL(mdiobus_read_nested); | |
846 | ||
2e888103 LB |
847 | /** |
848 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
849 | * @bus: the mii_bus struct | |
850 | * @addr: the phy address | |
851 | * @regnum: register number to read | |
852 | * | |
853 | * NOTE: MUST NOT be called from interrupt context, | |
854 | * because the bus read/write functions may wait for an interrupt | |
855 | * to conclude the operation. | |
856 | */ | |
abf35df2 | 857 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
858 | { |
859 | int retval; | |
860 | ||
2e888103 | 861 | mutex_lock(&bus->mdio_lock); |
34dc08e4 | 862 | retval = __mdiobus_read(bus, addr, regnum); |
2e888103 LB |
863 | mutex_unlock(&bus->mdio_lock); |
864 | ||
865 | return retval; | |
866 | } | |
867 | EXPORT_SYMBOL(mdiobus_read); | |
868 | ||
21dd19fe NA |
869 | /** |
870 | * mdiobus_write_nested - Nested version of the mdiobus_write function | |
871 | * @bus: the mii_bus struct | |
872 | * @addr: the phy address | |
873 | * @regnum: register number to write | |
874 | * @val: value to write to @regnum | |
875 | * | |
876 | * In case of nested MDIO bus access avoid lockdep false positives by | |
877 | * using mutex_lock_nested(). | |
878 | * | |
879 | * NOTE: MUST NOT be called from interrupt context, | |
880 | * because the bus read/write functions may wait for an interrupt | |
881 | * to conclude the operation. | |
882 | */ | |
883 | int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) | |
884 | { | |
885 | int err; | |
886 | ||
9a6f2b01 | 887 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
34dc08e4 | 888 | err = __mdiobus_write(bus, addr, regnum, val); |
21dd19fe NA |
889 | mutex_unlock(&bus->mdio_lock); |
890 | ||
891 | return err; | |
892 | } | |
893 | EXPORT_SYMBOL(mdiobus_write_nested); | |
894 | ||
2e888103 LB |
895 | /** |
896 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
897 | * @bus: the mii_bus struct | |
898 | * @addr: the phy address | |
899 | * @regnum: register number to write | |
900 | * @val: value to write to @regnum | |
901 | * | |
902 | * NOTE: MUST NOT be called from interrupt context, | |
903 | * because the bus read/write functions may wait for an interrupt | |
904 | * to conclude the operation. | |
905 | */ | |
abf35df2 | 906 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
907 | { |
908 | int err; | |
909 | ||
2e888103 | 910 | mutex_lock(&bus->mdio_lock); |
34dc08e4 | 911 | err = __mdiobus_write(bus, addr, regnum, val); |
2e888103 LB |
912 | mutex_unlock(&bus->mdio_lock); |
913 | ||
914 | return err; | |
915 | } | |
916 | EXPORT_SYMBOL(mdiobus_write); | |
917 | ||
6cc7cf81 RK |
918 | /** |
919 | * mdiobus_modify - Convenience function for modifying a given mdio device | |
920 | * register | |
921 | * @bus: the mii_bus struct | |
922 | * @addr: the phy address | |
923 | * @regnum: register number to write | |
924 | * @mask: bit mask of bits to clear | |
925 | * @set: bit mask of bits to set | |
926 | */ | |
927 | int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set) | |
928 | { | |
929 | int err; | |
930 | ||
6cc7cf81 RK |
931 | mutex_lock(&bus->mdio_lock); |
932 | err = __mdiobus_modify_changed(bus, addr, regnum, mask, set); | |
933 | mutex_unlock(&bus->mdio_lock); | |
934 | ||
935 | return err < 0 ? err : 0; | |
936 | } | |
937 | EXPORT_SYMBOL_GPL(mdiobus_modify); | |
938 | ||
79365f36 RKO |
939 | /** |
940 | * mdiobus_modify_changed - Convenience function for modifying a given mdio | |
941 | * device register and returning if it changed | |
942 | * @bus: the mii_bus struct | |
943 | * @addr: the phy address | |
944 | * @regnum: register number to write | |
945 | * @mask: bit mask of bits to clear | |
946 | * @set: bit mask of bits to set | |
947 | */ | |
948 | int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum, | |
949 | u16 mask, u16 set) | |
950 | { | |
951 | int err; | |
952 | ||
953 | mutex_lock(&bus->mdio_lock); | |
954 | err = __mdiobus_modify_changed(bus, addr, regnum, mask, set); | |
955 | mutex_unlock(&bus->mdio_lock); | |
956 | ||
957 | return err; | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(mdiobus_modify_changed); | |
960 | ||
b3df0da8 | 961 | /** |
e76a4957 AL |
962 | * mdio_bus_match - determine if given MDIO driver supports the given |
963 | * MDIO device | |
964 | * @dev: target MDIO device | |
965 | * @drv: given MDIO driver | |
00db8189 | 966 | * |
e76a4957 AL |
967 | * Description: Given a MDIO device, and a MDIO driver, return 1 if |
968 | * the driver supports the device. Otherwise, return 0. This may | |
969 | * require calling the devices own match function, since different classes | |
970 | * of MDIO devices have different match criteria. | |
00db8189 AF |
971 | */ |
972 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
973 | { | |
94114d90 | 974 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); |
e76a4957 | 975 | struct mdio_device *mdio = to_mdio_device(dev); |
00db8189 | 976 | |
94114d90 RKO |
977 | /* Both the driver and device must type-match */ |
978 | if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) != | |
979 | !(mdio->flags & MDIO_DEVICE_FLAG_PHY)) | |
980 | return 0; | |
981 | ||
a30e2c18 DD |
982 | if (of_driver_match_device(dev, drv)) |
983 | return 1; | |
984 | ||
e76a4957 AL |
985 | if (mdio->bus_match) |
986 | return mdio->bus_match(dev, drv); | |
a30e2c18 | 987 | |
e76a4957 | 988 | return 0; |
00db8189 AF |
989 | } |
990 | ||
1b8f8694 RK |
991 | static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env) |
992 | { | |
993 | int rc; | |
994 | ||
995 | /* Some devices have extra OF data and an OF-style MODALIAS */ | |
996 | rc = of_device_uevent_modalias(dev, env); | |
997 | if (rc != -ENODEV) | |
998 | return rc; | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
080bb352 FF |
1003 | static struct attribute *mdio_bus_device_statistics_attrs[] = { |
1004 | &dev_attr_mdio_bus_device_transfers.attr.attr, | |
1005 | &dev_attr_mdio_bus_device_errors.attr.attr, | |
1006 | &dev_attr_mdio_bus_device_writes.attr.attr, | |
1007 | &dev_attr_mdio_bus_device_reads.attr.attr, | |
1008 | NULL, | |
1009 | }; | |
1010 | ||
1011 | static const struct attribute_group mdio_bus_device_statistics_group = { | |
1012 | .name = "statistics", | |
1013 | .attrs = mdio_bus_device_statistics_attrs, | |
1014 | }; | |
1015 | ||
1016 | static const struct attribute_group *mdio_bus_dev_groups[] = { | |
1017 | &mdio_bus_device_statistics_group, | |
1018 | NULL, | |
1019 | }; | |
1020 | ||
00db8189 AF |
1021 | struct bus_type mdio_bus_type = { |
1022 | .name = "mdio_bus", | |
080bb352 | 1023 | .dev_groups = mdio_bus_dev_groups, |
00db8189 | 1024 | .match = mdio_bus_match, |
1b8f8694 | 1025 | .uevent = mdio_uevent, |
00db8189 | 1026 | }; |
11b0bacd | 1027 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 1028 | |
67c4f3fa | 1029 | int __init mdio_bus_init(void) |
00db8189 | 1030 | { |
46abc021 LB |
1031 | int ret; |
1032 | ||
1033 | ret = class_register(&mdio_bus_class); | |
1034 | if (!ret) { | |
1035 | ret = bus_register(&mdio_bus_type); | |
1036 | if (ret) | |
1037 | class_unregister(&mdio_bus_class); | |
1038 | } | |
1039 | ||
1040 | return ret; | |
00db8189 | 1041 | } |
90eff909 | 1042 | EXPORT_SYMBOL_GPL(mdio_bus_init); |
00db8189 | 1043 | |
90eff909 | 1044 | #if IS_ENABLED(CONFIG_PHYLIB) |
dc85dec6 | 1045 | void mdio_bus_exit(void) |
e1393456 | 1046 | { |
46abc021 | 1047 | class_unregister(&mdio_bus_class); |
e1393456 AF |
1048 | bus_unregister(&mdio_bus_type); |
1049 | } | |
90eff909 FF |
1050 | EXPORT_SYMBOL_GPL(mdio_bus_exit); |
1051 | #else | |
1052 | module_init(mdio_bus_init); | |
1053 | /* no module_exit, intentional */ | |
1054 | MODULE_LICENSE("GPL"); | |
1055 | MODULE_DESCRIPTION("MDIO bus/device layer"); | |
1056 | #endif |