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8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/delay.h>
12#include <linux/device.h>
13#include <linux/errno.h>
14#include <linux/etherdevice.h>
15#include <linux/ethtool.h>
16#include <linux/gpio.h>
17#include <linux/gpio/consumer.h>
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>
26#include <linux/of_device.h>
27#include <linux/of_gpio.h>
28#include <linux/of_mdio.h>
29#include <linux/phy.h>
30#include <linux/reset.h>
31#include <linux/skbuff.h>
32#include <linux/slab.h>
33#include <linux/spinlock.h>
34#include <linux/string.h>
35#include <linux/uaccess.h>
36#include <linux/unistd.h>
37
38#define CREATE_TRACE_POINTS
39#include <trace/events/mdio.h>
40
41#include "mdio-boardinfo.h"
42
43static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
44{
45
46 mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
47 "reset", GPIOD_OUT_LOW);
48 if (IS_ERR(mdiodev->reset_gpio))
49 return PTR_ERR(mdiodev->reset_gpio);
50
51 if (mdiodev->reset_gpio)
52 gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
53
54 return 0;
55}
56
57static int mdiobus_register_reset(struct mdio_device *mdiodev)
58{
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);
64
65 mdiodev->reset_ctrl = reset;
66
67 return 0;
68}
69
70int 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;
81
82 err = mdiobus_register_reset(mdiodev);
83 if (err)
84 return err;
85
86
87 mdio_device_reset(mdiodev, 1);
88 }
89
90 mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
91
92 return 0;
93}
94EXPORT_SYMBOL(mdiobus_register_device);
95
96int mdiobus_unregister_device(struct mdio_device *mdiodev)
97{
98 if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
99 return -EINVAL;
100
101 reset_control_put(mdiodev->reset_ctrl);
102
103 mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
104
105 return 0;
106}
107EXPORT_SYMBOL(mdiobus_unregister_device);
108
109struct 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}
121EXPORT_SYMBOL(mdiobus_get_phy);
122
123bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
124{
125 return bus->mdio_map[addr];
126}
127EXPORT_SYMBOL(mdiobus_is_registered_device);
128
129
130
131
132
133
134
135
136
137struct mii_bus *mdiobus_alloc_size(size_t size)
138{
139 struct mii_bus *bus;
140 size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
141 size_t alloc_size;
142 int i;
143
144
145 if (size)
146 alloc_size = aligned_size + size;
147 else
148 alloc_size = sizeof(*bus);
149
150 bus = kzalloc(alloc_size, GFP_KERNEL);
151 if (!bus)
152 return NULL;
153
154 bus->state = MDIOBUS_ALLOCATED;
155 if (size)
156 bus->priv = (void *)bus + aligned_size;
157
158
159 for (i = 0; i < PHY_MAX_ADDR; i++) {
160 bus->irq[i] = PHY_POLL;
161 u64_stats_init(&bus->stats[i].syncp);
162 }
163
164 return bus;
165}
166EXPORT_SYMBOL(mdiobus_alloc_size);
167
168
169
170
171
172
173
174
175static void mdiobus_release(struct device *d)
176{
177 struct mii_bus *bus = to_mii_bus(d);
178 BUG_ON(bus->state != MDIOBUS_RELEASED &&
179
180 bus->state != MDIOBUS_ALLOCATED);
181 kfree(bus);
182}
183
184struct mdio_bus_stat_attr {
185 int addr;
186 unsigned int field_offset;
187};
188
189static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset)
190{
191 const char *p = (const char *)s + offset;
192 unsigned int start;
193 u64 val = 0;
194
195 do {
196 start = u64_stats_fetch_begin(&s->syncp);
197 val = u64_stats_read((const u64_stats_t *)p);
198 } while (u64_stats_fetch_retry(&s->syncp, start));
199
200 return val;
201}
202
203static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)
204{
205 unsigned int i;
206 u64 val = 0;
207
208 for (i = 0; i < PHY_MAX_ADDR; i++)
209 val += mdio_bus_get_stat(&bus->stats[i], offset);
210
211 return val;
212}
213
214static ssize_t mdio_bus_stat_field_show(struct device *dev,
215 struct device_attribute *attr,
216 char *buf)
217{
218 struct mii_bus *bus = to_mii_bus(dev);
219 struct mdio_bus_stat_attr *sattr;
220 struct dev_ext_attribute *eattr;
221 u64 val;
222
223 eattr = container_of(attr, struct dev_ext_attribute, attr);
224 sattr = eattr->var;
225
226 if (sattr->addr < 0)
227 val = mdio_bus_get_global_stat(bus, sattr->field_offset);
228 else
229 val = mdio_bus_get_stat(&bus->stats[sattr->addr],
230 sattr->field_offset);
231
232 return sprintf(buf, "%llu\n", val);
233}
234
235static ssize_t mdio_bus_device_stat_field_show(struct device *dev,
236 struct device_attribute *attr,
237 char *buf)
238{
239 struct mdio_device *mdiodev = to_mdio_device(dev);
240 struct mii_bus *bus = mdiodev->bus;
241 struct mdio_bus_stat_attr *sattr;
242 struct dev_ext_attribute *eattr;
243 int addr = mdiodev->addr;
244 u64 val;
245
246 eattr = container_of(attr, struct dev_ext_attribute, attr);
247 sattr = eattr->var;
248
249 val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);
250
251 return sprintf(buf, "%llu\n", val);
252}
253
254#define MDIO_BUS_STATS_ATTR_DECL(field, file) \
255static struct dev_ext_attribute dev_attr_mdio_bus_##field = { \
256 .attr = { .attr = { .name = file, .mode = 0444 }, \
257 .show = mdio_bus_stat_field_show, \
258 }, \
259 .var = &((struct mdio_bus_stat_attr) { \
260 -1, offsetof(struct mdio_bus_stats, field) \
261 }), \
262}; \
263static struct dev_ext_attribute dev_attr_mdio_bus_device_##field = { \
264 .attr = { .attr = { .name = file, .mode = 0444 }, \
265 .show = mdio_bus_device_stat_field_show, \
266 }, \
267 .var = &((struct mdio_bus_stat_attr) { \
268 -1, offsetof(struct mdio_bus_stats, field) \
269 }), \
270};
271
272#define MDIO_BUS_STATS_ATTR(field) \
273 MDIO_BUS_STATS_ATTR_DECL(field, __stringify(field))
274
275MDIO_BUS_STATS_ATTR(transfers);
276MDIO_BUS_STATS_ATTR(errors);
277MDIO_BUS_STATS_ATTR(writes);
278MDIO_BUS_STATS_ATTR(reads);
279
280#define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file) \
281static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \
282 .attr = { .attr = { .name = file, .mode = 0444 }, \
283 .show = mdio_bus_stat_field_show, \
284 }, \
285 .var = &((struct mdio_bus_stat_attr) { \
286 addr, offsetof(struct mdio_bus_stats, field) \
287 }), \
288}
289
290#define MDIO_BUS_STATS_ADDR_ATTR(field, addr) \
291 MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, \
292 __stringify(field) "_" __stringify(addr))
293
294#define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr) \
295 MDIO_BUS_STATS_ADDR_ATTR(transfers, addr); \
296 MDIO_BUS_STATS_ADDR_ATTR(errors, addr); \
297 MDIO_BUS_STATS_ADDR_ATTR(writes, addr); \
298 MDIO_BUS_STATS_ADDR_ATTR(reads, addr) \
299
300MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0);
301MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1);
302MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2);
303MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3);
304MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4);
305MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5);
306MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6);
307MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7);
308MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8);
309MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9);
310MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10);
311MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11);
312MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12);
313MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13);
314MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14);
315MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15);
316MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16);
317MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17);
318MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18);
319MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19);
320MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20);
321MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21);
322MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22);
323MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23);
324MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24);
325MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25);
326MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26);
327MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27);
328MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28);
329MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29);
330MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30);
331MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31);
332
333#define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr) \
334 &dev_attr_mdio_bus_addr_transfers_##addr.attr.attr, \
335 &dev_attr_mdio_bus_addr_errors_##addr.attr.attr, \
336 &dev_attr_mdio_bus_addr_writes_##addr.attr.attr, \
337 &dev_attr_mdio_bus_addr_reads_##addr.attr.attr \
338
339static struct attribute *mdio_bus_statistics_attrs[] = {
340 &dev_attr_mdio_bus_transfers.attr.attr,
341 &dev_attr_mdio_bus_errors.attr.attr,
342 &dev_attr_mdio_bus_writes.attr.attr,
343 &dev_attr_mdio_bus_reads.attr.attr,
344 MDIO_BUS_STATS_ADDR_ATTR_GROUP(0),
345 MDIO_BUS_STATS_ADDR_ATTR_GROUP(1),
346 MDIO_BUS_STATS_ADDR_ATTR_GROUP(2),
347 MDIO_BUS_STATS_ADDR_ATTR_GROUP(3),
348 MDIO_BUS_STATS_ADDR_ATTR_GROUP(4),
349 MDIO_BUS_STATS_ADDR_ATTR_GROUP(5),
350 MDIO_BUS_STATS_ADDR_ATTR_GROUP(6),
351 MDIO_BUS_STATS_ADDR_ATTR_GROUP(7),
352 MDIO_BUS_STATS_ADDR_ATTR_GROUP(8),
353 MDIO_BUS_STATS_ADDR_ATTR_GROUP(9),
354 MDIO_BUS_STATS_ADDR_ATTR_GROUP(10),
355 MDIO_BUS_STATS_ADDR_ATTR_GROUP(11),
356 MDIO_BUS_STATS_ADDR_ATTR_GROUP(12),
357 MDIO_BUS_STATS_ADDR_ATTR_GROUP(13),
358 MDIO_BUS_STATS_ADDR_ATTR_GROUP(14),
359 MDIO_BUS_STATS_ADDR_ATTR_GROUP(15),
360 MDIO_BUS_STATS_ADDR_ATTR_GROUP(16),
361 MDIO_BUS_STATS_ADDR_ATTR_GROUP(17),
362 MDIO_BUS_STATS_ADDR_ATTR_GROUP(18),
363 MDIO_BUS_STATS_ADDR_ATTR_GROUP(19),
364 MDIO_BUS_STATS_ADDR_ATTR_GROUP(20),
365 MDIO_BUS_STATS_ADDR_ATTR_GROUP(21),
366 MDIO_BUS_STATS_ADDR_ATTR_GROUP(22),
367 MDIO_BUS_STATS_ADDR_ATTR_GROUP(23),
368 MDIO_BUS_STATS_ADDR_ATTR_GROUP(24),
369 MDIO_BUS_STATS_ADDR_ATTR_GROUP(25),
370 MDIO_BUS_STATS_ADDR_ATTR_GROUP(26),
371 MDIO_BUS_STATS_ADDR_ATTR_GROUP(27),
372 MDIO_BUS_STATS_ADDR_ATTR_GROUP(28),
373 MDIO_BUS_STATS_ADDR_ATTR_GROUP(29),
374 MDIO_BUS_STATS_ADDR_ATTR_GROUP(30),
375 MDIO_BUS_STATS_ADDR_ATTR_GROUP(31),
376 NULL,
377};
378
379static const struct attribute_group mdio_bus_statistics_group = {
380 .name = "statistics",
381 .attrs = mdio_bus_statistics_attrs,
382};
383
384static const struct attribute_group *mdio_bus_groups[] = {
385 &mdio_bus_statistics_group,
386 NULL,
387};
388
389static struct class mdio_bus_class = {
390 .name = "mdio_bus",
391 .dev_release = mdiobus_release,
392 .dev_groups = mdio_bus_groups,
393};
394
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398
399
400
401
402
403struct mii_bus *mdio_find_bus(const char *mdio_name)
404{
405 struct device *d;
406
407 d = class_find_device_by_name(&mdio_bus_class, mdio_name);
408 return d ? to_mii_bus(d) : NULL;
409}
410EXPORT_SYMBOL(mdio_find_bus);
411
412#if IS_ENABLED(CONFIG_OF_MDIO)
413
414
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423
424
425
426struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
427{
428 struct device *d;
429
430 if (!mdio_bus_np)
431 return NULL;
432
433 d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
434 return d ? to_mii_bus(d) : NULL;
435}
436EXPORT_SYMBOL(of_mdio_find_bus);
437
438
439
440
441
442
443
444static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
445 struct mdio_device *mdiodev)
446{
447 struct device *dev = &mdiodev->dev;
448 struct device_node *child;
449
450 if (dev->of_node || !bus->dev.of_node)
451 return;
452
453 for_each_available_child_of_node(bus->dev.of_node, child) {
454 int addr;
455
456 addr = of_mdio_parse_addr(dev, child);
457 if (addr < 0)
458 continue;
459
460 if (addr == mdiodev->addr) {
461 dev->of_node = child;
462 dev->fwnode = of_fwnode_handle(child);
463 return;
464 }
465 }
466}
467#else
468static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio,
469 struct mdio_device *mdiodev)
470{
471}
472#endif
473
474
475
476
477
478
479
480
481
482static 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
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512
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515
516
517
518int __mdiobus_register(struct mii_bus *bus, struct module *owner)
519{
520 struct mdio_device *mdiodev;
521 int i, err;
522 struct gpio_desc *gpiod;
523
524 if (NULL == bus || NULL == bus->name ||
525 NULL == bus->read || NULL == bus->write)
526 return -EINVAL;
527
528 BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
529 bus->state != MDIOBUS_UNREGISTERED);
530
531 bus->owner = owner;
532 bus->dev.parent = bus->parent;
533 bus->dev.class = &mdio_bus_class;
534 bus->dev.groups = NULL;
535 dev_set_name(&bus->dev, "%s", bus->id);
536
537 err = device_register(&bus->dev);
538 if (err) {
539 pr_err("mii_bus %s failed to register\n", bus->id);
540 return -EINVAL;
541 }
542
543 mutex_init(&bus->mdio_lock);
544 mutex_init(&bus->shared_lock);
545
546
547 gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);
548 if (IS_ERR(gpiod)) {
549 dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",
550 bus->id);
551 device_del(&bus->dev);
552 return PTR_ERR(gpiod);
553 } else if (gpiod) {
554 bus->reset_gpiod = gpiod;
555
556 gpiod_set_value_cansleep(gpiod, 1);
557 fsleep(bus->reset_delay_us);
558 gpiod_set_value_cansleep(gpiod, 0);
559 if (bus->reset_post_delay_us > 0)
560 fsleep(bus->reset_post_delay_us);
561 }
562
563 if (bus->reset) {
564 err = bus->reset(bus);
565 if (err)
566 goto error_reset_gpiod;
567 }
568
569 for (i = 0; i < PHY_MAX_ADDR; i++) {
570 if ((bus->phy_mask & (1 << i)) == 0) {
571 struct phy_device *phydev;
572
573 phydev = mdiobus_scan(bus, i);
574 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {
575 err = PTR_ERR(phydev);
576 goto error;
577 }
578 }
579 }
580
581 mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);
582
583 bus->state = MDIOBUS_REGISTERED;
584 pr_info("%s: probed\n", bus->name);
585 return 0;
586
587error:
588 while (--i >= 0) {
589 mdiodev = bus->mdio_map[i];
590 if (!mdiodev)
591 continue;
592
593 mdiodev->device_remove(mdiodev);
594 mdiodev->device_free(mdiodev);
595 }
596error_reset_gpiod:
597
598 if (bus->reset_gpiod)
599 gpiod_set_value_cansleep(bus->reset_gpiod, 1);
600
601 device_del(&bus->dev);
602 return err;
603}
604EXPORT_SYMBOL(__mdiobus_register);
605
606void mdiobus_unregister(struct mii_bus *bus)
607{
608 struct mdio_device *mdiodev;
609 int i;
610
611 BUG_ON(bus->state != MDIOBUS_REGISTERED);
612 bus->state = MDIOBUS_UNREGISTERED;
613
614 for (i = 0; i < PHY_MAX_ADDR; i++) {
615 mdiodev = bus->mdio_map[i];
616 if (!mdiodev)
617 continue;
618
619 if (mdiodev->reset_gpio)
620 gpiod_put(mdiodev->reset_gpio);
621
622 mdiodev->device_remove(mdiodev);
623 mdiodev->device_free(mdiodev);
624 }
625
626
627 if (bus->reset_gpiod)
628 gpiod_set_value_cansleep(bus->reset_gpiod, 1);
629
630 device_del(&bus->dev);
631}
632EXPORT_SYMBOL(mdiobus_unregister);
633
634
635
636
637
638
639
640
641
642void mdiobus_free(struct mii_bus *bus)
643{
644
645 if (bus->state == MDIOBUS_ALLOCATED) {
646 kfree(bus);
647 return;
648 }
649
650 BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
651 bus->state = MDIOBUS_RELEASED;
652
653 put_device(&bus->dev);
654}
655EXPORT_SYMBOL(mdiobus_free);
656
657
658
659
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663
664
665
666
667
668
669struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
670{
671 struct phy_device *phydev = ERR_PTR(-ENODEV);
672 int err;
673
674 switch (bus->probe_capabilities) {
675 case MDIOBUS_NO_CAP:
676 case MDIOBUS_C22:
677 phydev = get_phy_device(bus, addr, false);
678 break;
679 case MDIOBUS_C45:
680 phydev = get_phy_device(bus, addr, true);
681 break;
682 case MDIOBUS_C22_C45:
683 phydev = get_phy_device(bus, addr, false);
684 if (IS_ERR(phydev))
685 phydev = get_phy_device(bus, addr, true);
686 break;
687 }
688
689 if (IS_ERR(phydev))
690 return phydev;
691
692
693
694
695
696 of_mdiobus_link_mdiodev(bus, &phydev->mdio);
697
698 err = phy_device_register(phydev);
699 if (err) {
700 phy_device_free(phydev);
701 return ERR_PTR(-ENODEV);
702 }
703
704 return phydev;
705}
706EXPORT_SYMBOL(mdiobus_scan);
707
708static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)
709{
710 preempt_disable();
711 u64_stats_update_begin(&stats->syncp);
712
713 u64_stats_inc(&stats->transfers);
714 if (ret < 0) {
715 u64_stats_inc(&stats->errors);
716 goto out;
717 }
718
719 if (op)
720 u64_stats_inc(&stats->reads);
721 else
722 u64_stats_inc(&stats->writes);
723out:
724 u64_stats_update_end(&stats->syncp);
725 preempt_enable();
726}
727
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730
731
732
733
734
735
736
737
738int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
739{
740 int retval;
741
742 WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
743
744 retval = bus->read(bus, addr, regnum);
745
746 trace_mdio_access(bus, 1, addr, regnum, retval, retval);
747 mdiobus_stats_acct(&bus->stats[addr], true, retval);
748
749 return retval;
750}
751EXPORT_SYMBOL(__mdiobus_read);
752
753
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756
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760
761
762
763
764int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
765{
766 int err;
767
768 WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
769
770 err = bus->write(bus, addr, regnum, val);
771
772 trace_mdio_access(bus, 0, addr, regnum, val, err);
773 mdiobus_stats_acct(&bus->stats[addr], false, err);
774
775 return err;
776}
777EXPORT_SYMBOL(__mdiobus_write);
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
793 u16 mask, u16 set)
794{
795 int new, ret;
796
797 ret = __mdiobus_read(bus, addr, regnum);
798 if (ret < 0)
799 return ret;
800
801 new = (ret & ~mask) | set;
802 if (new == ret)
803 return 0;
804
805 ret = __mdiobus_write(bus, addr, regnum, new);
806
807 return ret < 0 ? ret : 1;
808}
809EXPORT_SYMBOL_GPL(__mdiobus_modify_changed);
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)
825{
826 int retval;
827
828 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
829 retval = __mdiobus_read(bus, addr, regnum);
830 mutex_unlock(&bus->mdio_lock);
831
832 return retval;
833}
834EXPORT_SYMBOL(mdiobus_read_nested);
835
836
837
838
839
840
841
842
843
844
845
846int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
847{
848 int retval;
849
850 mutex_lock(&bus->mdio_lock);
851 retval = __mdiobus_read(bus, addr, regnum);
852 mutex_unlock(&bus->mdio_lock);
853
854 return retval;
855}
856EXPORT_SYMBOL(mdiobus_read);
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)
873{
874 int err;
875
876 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
877 err = __mdiobus_write(bus, addr, regnum, val);
878 mutex_unlock(&bus->mdio_lock);
879
880 return err;
881}
882EXPORT_SYMBOL(mdiobus_write_nested);
883
884
885
886
887
888
889
890
891
892
893
894
895int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
896{
897 int err;
898
899 mutex_lock(&bus->mdio_lock);
900 err = __mdiobus_write(bus, addr, regnum, val);
901 mutex_unlock(&bus->mdio_lock);
902
903 return err;
904}
905EXPORT_SYMBOL(mdiobus_write);
906
907
908
909
910
911
912
913
914
915
916int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)
917{
918 int err;
919
920 mutex_lock(&bus->mdio_lock);
921 err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
922 mutex_unlock(&bus->mdio_lock);
923
924 return err < 0 ? err : 0;
925}
926EXPORT_SYMBOL_GPL(mdiobus_modify);
927
928
929
930
931
932
933
934
935
936
937
938
939static int mdio_bus_match(struct device *dev, struct device_driver *drv)
940{
941 struct mdio_device *mdio = to_mdio_device(dev);
942
943 if (of_driver_match_device(dev, drv))
944 return 1;
945
946 if (mdio->bus_match)
947 return mdio->bus_match(dev, drv);
948
949 return 0;
950}
951
952static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
953{
954 int rc;
955
956
957 rc = of_device_uevent_modalias(dev, env);
958 if (rc != -ENODEV)
959 return rc;
960
961 return 0;
962}
963
964static struct attribute *mdio_bus_device_statistics_attrs[] = {
965 &dev_attr_mdio_bus_device_transfers.attr.attr,
966 &dev_attr_mdio_bus_device_errors.attr.attr,
967 &dev_attr_mdio_bus_device_writes.attr.attr,
968 &dev_attr_mdio_bus_device_reads.attr.attr,
969 NULL,
970};
971
972static const struct attribute_group mdio_bus_device_statistics_group = {
973 .name = "statistics",
974 .attrs = mdio_bus_device_statistics_attrs,
975};
976
977static const struct attribute_group *mdio_bus_dev_groups[] = {
978 &mdio_bus_device_statistics_group,
979 NULL,
980};
981
982struct bus_type mdio_bus_type = {
983 .name = "mdio_bus",
984 .dev_groups = mdio_bus_dev_groups,
985 .match = mdio_bus_match,
986 .uevent = mdio_uevent,
987};
988EXPORT_SYMBOL(mdio_bus_type);
989
990int __init mdio_bus_init(void)
991{
992 int ret;
993
994 ret = class_register(&mdio_bus_class);
995 if (!ret) {
996 ret = bus_register(&mdio_bus_type);
997 if (ret)
998 class_unregister(&mdio_bus_class);
999 }
1000
1001 return ret;
1002}
1003EXPORT_SYMBOL_GPL(mdio_bus_init);
1004
1005#if IS_ENABLED(CONFIG_PHYLIB)
1006void mdio_bus_exit(void)
1007{
1008 class_unregister(&mdio_bus_class);
1009 bus_unregister(&mdio_bus_type);
1010}
1011EXPORT_SYMBOL_GPL(mdio_bus_exit);
1012#else
1013module_init(mdio_bus_init);
1014
1015MODULE_LICENSE("GPL");
1016MODULE_DESCRIPTION("MDIO bus/device layer");
1017#endif
1018