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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/kernel.h>
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>
24#include <linux/device.h>
25#include <linux/gpio.h>
26#include <linux/gpio/consumer.h>
27#include <linux/of_device.h>
28#include <linux/of_mdio.h>
29#include <linux/of_gpio.h>
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>
36#include <linux/mii.h>
37#include <linux/ethtool.h>
38#include <linux/phy.h>
39#include <linux/io.h>
40#include <linux/uaccess.h>
41
42#include <asm/irq.h>
43
44#define CREATE_TRACE_POINTS
45#include <trace/events/mdio.h>
46
47#include "mdio-boardinfo.h"
48
49int mdiobus_register_device(struct mdio_device *mdiodev)
50{
51 if (mdiodev->bus->mdio_map[mdiodev->addr])
52 return -EBUSY;
53
54 mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
55
56 return 0;
57}
58EXPORT_SYMBOL(mdiobus_register_device);
59
60int mdiobus_unregister_device(struct mdio_device *mdiodev)
61{
62 if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
63 return -EINVAL;
64
65 mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
66
67 return 0;
68}
69EXPORT_SYMBOL(mdiobus_unregister_device);
70
71struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
72{
73 struct mdio_device *mdiodev = bus->mdio_map[addr];
74
75 if (!mdiodev)
76 return NULL;
77
78 if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))
79 return NULL;
80
81 return container_of(mdiodev, struct phy_device, mdio);
82}
83EXPORT_SYMBOL(mdiobus_get_phy);
84
85bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
86{
87 return bus->mdio_map[addr];
88}
89EXPORT_SYMBOL(mdiobus_is_registered_device);
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98
99struct mii_bus *mdiobus_alloc_size(size_t size)
100{
101 struct mii_bus *bus;
102 size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
103 size_t alloc_size;
104 int i;
105
106
107 if (size)
108 alloc_size = aligned_size + size;
109 else
110 alloc_size = sizeof(*bus);
111
112 bus = kzalloc(alloc_size, GFP_KERNEL);
113 if (!bus)
114 return NULL;
115
116 bus->state = MDIOBUS_ALLOCATED;
117 if (size)
118 bus->priv = (void *)bus + aligned_size;
119
120
121 for (i = 0; i < PHY_MAX_ADDR; i++)
122 bus->irq[i] = PHY_POLL;
123
124 return bus;
125}
126EXPORT_SYMBOL(mdiobus_alloc_size);
127
128static void _devm_mdiobus_free(struct device *dev, void *res)
129{
130 mdiobus_free(*(struct mii_bus **)res);
131}
132
133static int devm_mdiobus_match(struct device *dev, void *res, void *data)
134{
135 struct mii_bus **r = res;
136
137 if (WARN_ON(!r || !*r))
138 return 0;
139
140 return *r == data;
141}
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157struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv)
158{
159 struct mii_bus **ptr, *bus;
160
161 ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL);
162 if (!ptr)
163 return NULL;
164
165
166 bus = mdiobus_alloc_size(sizeof_priv);
167 if (bus) {
168 *ptr = bus;
169 devres_add(dev, ptr);
170 } else {
171 devres_free(ptr);
172 }
173
174 return bus;
175}
176EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size);
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185void devm_mdiobus_free(struct device *dev, struct mii_bus *bus)
186{
187 int rc;
188
189 rc = devres_release(dev, _devm_mdiobus_free,
190 devm_mdiobus_match, bus);
191 WARN_ON(rc);
192}
193EXPORT_SYMBOL_GPL(devm_mdiobus_free);
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201
202static void mdiobus_release(struct device *d)
203{
204 struct mii_bus *bus = to_mii_bus(d);
205 BUG_ON(bus->state != MDIOBUS_RELEASED &&
206
207 bus->state != MDIOBUS_ALLOCATED);
208 kfree(bus);
209}
210
211static struct class mdio_bus_class = {
212 .name = "mdio_bus",
213 .dev_release = mdiobus_release,
214};
215
216#if IS_ENABLED(CONFIG_OF_MDIO)
217
218static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np)
219{
220 return dev->of_node == mdio_bus_np;
221}
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235struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
236{
237 struct device *d;
238
239 if (!mdio_bus_np)
240 return NULL;
241
242 d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np,
243 of_mdio_bus_match);
244
245 return d ? to_mii_bus(d) : NULL;
246}
247EXPORT_SYMBOL(of_mdio_find_bus);
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254
255static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
256 struct mdio_device *mdiodev)
257{
258 struct device *dev = &mdiodev->dev;
259 struct device_node *child;
260
261 if (dev->of_node || !bus->dev.of_node)
262 return;
263
264 for_each_available_child_of_node(bus->dev.of_node, child) {
265 int addr;
266
267 addr = of_mdio_parse_addr(dev, child);
268 if (addr < 0)
269 continue;
270
271 if (addr == mdiodev->addr) {
272 dev->of_node = child;
273 return;
274 }
275 }
276}
277#else
278static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio,
279 struct mdio_device *mdiodev)
280{
281}
282#endif
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291
292static int mdiobus_create_device(struct mii_bus *bus,
293 struct mdio_board_info *bi)
294{
295 struct mdio_device *mdiodev;
296 int ret = 0;
297
298 mdiodev = mdio_device_create(bus, bi->mdio_addr);
299 if (IS_ERR(mdiodev))
300 return -ENODEV;
301
302 strncpy(mdiodev->modalias, bi->modalias,
303 sizeof(mdiodev->modalias));
304 mdiodev->bus_match = mdio_device_bus_match;
305 mdiodev->dev.platform_data = (void *)bi->platform_data;
306
307 ret = mdio_device_register(mdiodev);
308 if (ret)
309 mdio_device_free(mdiodev);
310
311 return ret;
312}
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328int __mdiobus_register(struct mii_bus *bus, struct module *owner)
329{
330 struct mdio_device *mdiodev;
331 int i, err;
332 struct gpio_desc *gpiod;
333
334 if (NULL == bus || NULL == bus->name ||
335 NULL == bus->read || NULL == bus->write)
336 return -EINVAL;
337
338 BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
339 bus->state != MDIOBUS_UNREGISTERED);
340
341 bus->owner = owner;
342 bus->dev.parent = bus->parent;
343 bus->dev.class = &mdio_bus_class;
344 bus->dev.groups = NULL;
345 dev_set_name(&bus->dev, "%s", bus->id);
346
347 err = device_register(&bus->dev);
348 if (err) {
349 pr_err("mii_bus %s failed to register\n", bus->id);
350 put_device(&bus->dev);
351 return -EINVAL;
352 }
353
354 mutex_init(&bus->mdio_lock);
355
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357 gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);
358 if (IS_ERR(gpiod)) {
359 dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",
360 bus->id);
361 return PTR_ERR(gpiod);
362 } else if (gpiod) {
363 bus->reset_gpiod = gpiod;
364
365 gpiod_set_value_cansleep(gpiod, 1);
366 udelay(bus->reset_delay_us);
367 gpiod_set_value_cansleep(gpiod, 0);
368 }
369
370 if (bus->reset)
371 bus->reset(bus);
372
373 for (i = 0; i < PHY_MAX_ADDR; i++) {
374 if ((bus->phy_mask & (1 << i)) == 0) {
375 struct phy_device *phydev;
376
377 phydev = mdiobus_scan(bus, i);
378 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {
379 err = PTR_ERR(phydev);
380 goto error;
381 }
382 }
383 }
384
385 mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);
386
387 bus->state = MDIOBUS_REGISTERED;
388 pr_info("%s: probed\n", bus->name);
389 return 0;
390
391error:
392 while (--i >= 0) {
393 mdiodev = bus->mdio_map[i];
394 if (!mdiodev)
395 continue;
396
397 mdiodev->device_remove(mdiodev);
398 mdiodev->device_free(mdiodev);
399 }
400
401
402 if (bus->reset_gpiod)
403 gpiod_set_value_cansleep(bus->reset_gpiod, 1);
404
405 device_del(&bus->dev);
406 return err;
407}
408EXPORT_SYMBOL(__mdiobus_register);
409
410void mdiobus_unregister(struct mii_bus *bus)
411{
412 struct mdio_device *mdiodev;
413 int i;
414
415 BUG_ON(bus->state != MDIOBUS_REGISTERED);
416 bus->state = MDIOBUS_UNREGISTERED;
417
418 for (i = 0; i < PHY_MAX_ADDR; i++) {
419 mdiodev = bus->mdio_map[i];
420 if (!mdiodev)
421 continue;
422
423 mdiodev->device_remove(mdiodev);
424 mdiodev->device_free(mdiodev);
425 }
426
427
428 if (bus->reset_gpiod)
429 gpiod_set_value_cansleep(bus->reset_gpiod, 1);
430
431 device_del(&bus->dev);
432}
433EXPORT_SYMBOL(mdiobus_unregister);
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443void mdiobus_free(struct mii_bus *bus)
444{
445
446 if (bus->state == MDIOBUS_ALLOCATED) {
447 kfree(bus);
448 return;
449 }
450
451 BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
452 bus->state = MDIOBUS_RELEASED;
453
454 put_device(&bus->dev);
455}
456EXPORT_SYMBOL(mdiobus_free);
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470struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
471{
472 struct phy_device *phydev;
473 int err;
474
475 phydev = get_phy_device(bus, addr, false);
476 if (IS_ERR(phydev))
477 return phydev;
478
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483 of_mdiobus_link_mdiodev(bus, &phydev->mdio);
484
485 err = phy_device_register(phydev);
486 if (err) {
487 phy_device_free(phydev);
488 return ERR_PTR(-ENODEV);
489 }
490
491 return phydev;
492}
493EXPORT_SYMBOL(mdiobus_scan);
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508int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)
509{
510 int retval;
511
512 BUG_ON(in_interrupt());
513
514 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
515 retval = bus->read(bus, addr, regnum);
516 mutex_unlock(&bus->mdio_lock);
517
518 trace_mdio_access(bus, 1, addr, regnum, retval, retval);
519
520 return retval;
521}
522EXPORT_SYMBOL(mdiobus_read_nested);
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534int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
535{
536 int retval;
537
538 BUG_ON(in_interrupt());
539
540 mutex_lock(&bus->mdio_lock);
541 retval = bus->read(bus, addr, regnum);
542 mutex_unlock(&bus->mdio_lock);
543
544 trace_mdio_access(bus, 1, addr, regnum, retval, retval);
545
546 return retval;
547}
548EXPORT_SYMBOL(mdiobus_read);
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564int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)
565{
566 int err;
567
568 BUG_ON(in_interrupt());
569
570 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
571 err = bus->write(bus, addr, regnum, val);
572 mutex_unlock(&bus->mdio_lock);
573
574 trace_mdio_access(bus, 0, addr, regnum, val, err);
575
576 return err;
577}
578EXPORT_SYMBOL(mdiobus_write_nested);
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591int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
592{
593 int err;
594
595 BUG_ON(in_interrupt());
596
597 mutex_lock(&bus->mdio_lock);
598 err = bus->write(bus, addr, regnum, val);
599 mutex_unlock(&bus->mdio_lock);
600
601 trace_mdio_access(bus, 0, addr, regnum, val, err);
602
603 return err;
604}
605EXPORT_SYMBOL(mdiobus_write);
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618static int mdio_bus_match(struct device *dev, struct device_driver *drv)
619{
620 struct mdio_device *mdio = to_mdio_device(dev);
621
622 if (of_driver_match_device(dev, drv))
623 return 1;
624
625 if (mdio->bus_match)
626 return mdio->bus_match(dev, drv);
627
628 return 0;
629}
630
631static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
632{
633 int rc;
634
635
636 rc = of_device_uevent_modalias(dev, env);
637 if (rc != -ENODEV)
638 return rc;
639
640 return 0;
641}
642
643#ifdef CONFIG_PM
644static int mdio_bus_suspend(struct device *dev)
645{
646 struct mdio_device *mdio = to_mdio_device(dev);
647
648 if (mdio->pm_ops && mdio->pm_ops->suspend)
649 return mdio->pm_ops->suspend(dev);
650
651 return 0;
652}
653
654static int mdio_bus_resume(struct device *dev)
655{
656 struct mdio_device *mdio = to_mdio_device(dev);
657
658 if (mdio->pm_ops && mdio->pm_ops->resume)
659 return mdio->pm_ops->resume(dev);
660
661 return 0;
662}
663
664static int mdio_bus_restore(struct device *dev)
665{
666 struct mdio_device *mdio = to_mdio_device(dev);
667
668 if (mdio->pm_ops && mdio->pm_ops->restore)
669 return mdio->pm_ops->restore(dev);
670
671 return 0;
672}
673
674static const struct dev_pm_ops mdio_bus_pm_ops = {
675 .suspend = mdio_bus_suspend,
676 .resume = mdio_bus_resume,
677 .freeze = mdio_bus_suspend,
678 .thaw = mdio_bus_resume,
679 .restore = mdio_bus_restore,
680};
681
682#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
683
684#else
685
686#define MDIO_BUS_PM_OPS NULL
687
688#endif
689
690struct bus_type mdio_bus_type = {
691 .name = "mdio_bus",
692 .match = mdio_bus_match,
693 .uevent = mdio_uevent,
694 .pm = MDIO_BUS_PM_OPS,
695};
696EXPORT_SYMBOL(mdio_bus_type);
697
698int __init mdio_bus_init(void)
699{
700 int ret;
701
702 ret = class_register(&mdio_bus_class);
703 if (!ret) {
704 ret = bus_register(&mdio_bus_type);
705 if (ret)
706 class_unregister(&mdio_bus_class);
707 }
708
709 return ret;
710}
711EXPORT_SYMBOL_GPL(mdio_bus_init);
712
713#if IS_ENABLED(CONFIG_PHYLIB)
714void mdio_bus_exit(void)
715{
716 class_unregister(&mdio_bus_class);
717 bus_unregister(&mdio_bus_type);
718}
719EXPORT_SYMBOL_GPL(mdio_bus_exit);
720#else
721module_init(mdio_bus_init);
722
723MODULE_LICENSE("GPL");
724MODULE_DESCRIPTION("MDIO bus/device layer");
725#endif
726