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9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/errno.h>
14#include <linux/unistd.h>
15#include <linux/slab.h>
16#include <linux/interrupt.h>
17#include <linux/init.h>
18#include <linux/delay.h>
19#include <linux/device.h>
20#include <linux/gpio.h>
21#include <linux/gpio/consumer.h>
22#include <linux/of_device.h>
23#include <linux/of_mdio.h>
24#include <linux/of_gpio.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/reset.h>
28#include <linux/skbuff.h>
29#include <linux/spinlock.h>
30#include <linux/mm.h>
31#include <linux/module.h>
32#include <linux/mii.h>
33#include <linux/ethtool.h>
34#include <linux/phy.h>
35#include <linux/io.h>
36#include <linux/uaccess.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 int error;
46
47
48 mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
49 "reset", GPIOD_OUT_LOW);
50 error = PTR_ERR_OR_ZERO(mdiodev->reset_gpio);
51 if (error)
52 return error;
53
54 if (mdiodev->reset_gpio)
55 gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
56
57 return 0;
58}
59
60static int mdiobus_register_reset(struct mdio_device *mdiodev)
61{
62 struct reset_control *reset = NULL;
63
64 if (mdiodev->dev.of_node)
65 reset = devm_reset_control_get_exclusive(&mdiodev->dev,
66 "phy");
67 if (IS_ERR(reset)) {
68 if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) == -ENOTSUPP)
69 reset = NULL;
70 else
71 return PTR_ERR(reset);
72 }
73
74 mdiodev->reset_ctrl = reset;
75
76 return 0;
77}
78
79int mdiobus_register_device(struct mdio_device *mdiodev)
80{
81 int err;
82
83 if (mdiodev->bus->mdio_map[mdiodev->addr])
84 return -EBUSY;
85
86 if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
87 err = mdiobus_register_gpiod(mdiodev);
88 if (err)
89 return err;
90
91 err = mdiobus_register_reset(mdiodev);
92 if (err)
93 return err;
94
95
96 mdio_device_reset(mdiodev, 1);
97 }
98
99 mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
100
101 return 0;
102}
103EXPORT_SYMBOL(mdiobus_register_device);
104
105int mdiobus_unregister_device(struct mdio_device *mdiodev)
106{
107 if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
108 return -EINVAL;
109
110 mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
111
112 return 0;
113}
114EXPORT_SYMBOL(mdiobus_unregister_device);
115
116struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
117{
118 struct mdio_device *mdiodev = bus->mdio_map[addr];
119
120 if (!mdiodev)
121 return NULL;
122
123 if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))
124 return NULL;
125
126 return container_of(mdiodev, struct phy_device, mdio);
127}
128EXPORT_SYMBOL(mdiobus_get_phy);
129
130bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
131{
132 return bus->mdio_map[addr];
133}
134EXPORT_SYMBOL(mdiobus_is_registered_device);
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143
144struct mii_bus *mdiobus_alloc_size(size_t size)
145{
146 struct mii_bus *bus;
147 size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
148 size_t alloc_size;
149 int i;
150
151
152 if (size)
153 alloc_size = aligned_size + size;
154 else
155 alloc_size = sizeof(*bus);
156
157 bus = kzalloc(alloc_size, GFP_KERNEL);
158 if (!bus)
159 return NULL;
160
161 bus->state = MDIOBUS_ALLOCATED;
162 if (size)
163 bus->priv = (void *)bus + aligned_size;
164
165
166 for (i = 0; i < PHY_MAX_ADDR; i++)
167 bus->irq[i] = PHY_POLL;
168
169 return bus;
170}
171EXPORT_SYMBOL(mdiobus_alloc_size);
172
173static void _devm_mdiobus_free(struct device *dev, void *res)
174{
175 mdiobus_free(*(struct mii_bus **)res);
176}
177
178static int devm_mdiobus_match(struct device *dev, void *res, void *data)
179{
180 struct mii_bus **r = res;
181
182 if (WARN_ON(!r || !*r))
183 return 0;
184
185 return *r == data;
186}
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201
202struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv)
203{
204 struct mii_bus **ptr, *bus;
205
206 ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL);
207 if (!ptr)
208 return NULL;
209
210
211 bus = mdiobus_alloc_size(sizeof_priv);
212 if (bus) {
213 *ptr = bus;
214 devres_add(dev, ptr);
215 } else {
216 devres_free(ptr);
217 }
218
219 return bus;
220}
221EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size);
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229
230void devm_mdiobus_free(struct device *dev, struct mii_bus *bus)
231{
232 int rc;
233
234 rc = devres_release(dev, _devm_mdiobus_free,
235 devm_mdiobus_match, bus);
236 WARN_ON(rc);
237}
238EXPORT_SYMBOL_GPL(devm_mdiobus_free);
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246
247static void mdiobus_release(struct device *d)
248{
249 struct mii_bus *bus = to_mii_bus(d);
250 BUG_ON(bus->state != MDIOBUS_RELEASED &&
251
252 bus->state != MDIOBUS_ALLOCATED);
253 kfree(bus);
254}
255
256static struct class mdio_bus_class = {
257 .name = "mdio_bus",
258 .dev_release = mdiobus_release,
259};
260
261#if IS_ENABLED(CONFIG_OF_MDIO)
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274
275struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
276{
277 struct device *d;
278
279 if (!mdio_bus_np)
280 return NULL;
281
282 d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
283 return d ? to_mii_bus(d) : NULL;
284}
285EXPORT_SYMBOL(of_mdio_find_bus);
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292
293static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
294 struct mdio_device *mdiodev)
295{
296 struct device *dev = &mdiodev->dev;
297 struct device_node *child;
298
299 if (dev->of_node || !bus->dev.of_node)
300 return;
301
302 for_each_available_child_of_node(bus->dev.of_node, child) {
303 int addr;
304
305 addr = of_mdio_parse_addr(dev, child);
306 if (addr < 0)
307 continue;
308
309 if (addr == mdiodev->addr) {
310 dev->of_node = child;
311 dev->fwnode = of_fwnode_handle(child);
312 return;
313 }
314 }
315}
316#else
317static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio,
318 struct mdio_device *mdiodev)
319{
320}
321#endif
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330
331static int mdiobus_create_device(struct mii_bus *bus,
332 struct mdio_board_info *bi)
333{
334 struct mdio_device *mdiodev;
335 int ret = 0;
336
337 mdiodev = mdio_device_create(bus, bi->mdio_addr);
338 if (IS_ERR(mdiodev))
339 return -ENODEV;
340
341 strncpy(mdiodev->modalias, bi->modalias,
342 sizeof(mdiodev->modalias));
343 mdiodev->bus_match = mdio_device_bus_match;
344 mdiodev->dev.platform_data = (void *)bi->platform_data;
345
346 ret = mdio_device_register(mdiodev);
347 if (ret)
348 mdio_device_free(mdiodev);
349
350 return ret;
351}
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367int __mdiobus_register(struct mii_bus *bus, struct module *owner)
368{
369 struct mdio_device *mdiodev;
370 int i, err;
371 struct gpio_desc *gpiod;
372
373 if (NULL == bus || NULL == bus->name ||
374 NULL == bus->read || NULL == bus->write)
375 return -EINVAL;
376
377 BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
378 bus->state != MDIOBUS_UNREGISTERED);
379
380 bus->owner = owner;
381 bus->dev.parent = bus->parent;
382 bus->dev.class = &mdio_bus_class;
383 bus->dev.groups = NULL;
384 dev_set_name(&bus->dev, "%s", bus->id);
385
386 err = device_register(&bus->dev);
387 if (err) {
388 pr_err("mii_bus %s failed to register\n", bus->id);
389 return -EINVAL;
390 }
391
392 mutex_init(&bus->mdio_lock);
393
394
395 gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);
396 if (IS_ERR(gpiod)) {
397 dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",
398 bus->id);
399 device_del(&bus->dev);
400 return PTR_ERR(gpiod);
401 } else if (gpiod) {
402 bus->reset_gpiod = gpiod;
403
404 gpiod_set_value_cansleep(gpiod, 1);
405 udelay(bus->reset_delay_us);
406 gpiod_set_value_cansleep(gpiod, 0);
407 }
408
409 if (bus->reset)
410 bus->reset(bus);
411
412 for (i = 0; i < PHY_MAX_ADDR; i++) {
413 if ((bus->phy_mask & (1 << i)) == 0) {
414 struct phy_device *phydev;
415
416 phydev = mdiobus_scan(bus, i);
417 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {
418 err = PTR_ERR(phydev);
419 goto error;
420 }
421 }
422 }
423
424 mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);
425
426 bus->state = MDIOBUS_REGISTERED;
427 pr_info("%s: probed\n", bus->name);
428 return 0;
429
430error:
431 while (--i >= 0) {
432 mdiodev = bus->mdio_map[i];
433 if (!mdiodev)
434 continue;
435
436 mdiodev->device_remove(mdiodev);
437 mdiodev->device_free(mdiodev);
438 }
439
440
441 if (bus->reset_gpiod)
442 gpiod_set_value_cansleep(bus->reset_gpiod, 1);
443
444 device_del(&bus->dev);
445 return err;
446}
447EXPORT_SYMBOL(__mdiobus_register);
448
449void mdiobus_unregister(struct mii_bus *bus)
450{
451 struct mdio_device *mdiodev;
452 int i;
453
454 BUG_ON(bus->state != MDIOBUS_REGISTERED);
455 bus->state = MDIOBUS_UNREGISTERED;
456
457 for (i = 0; i < PHY_MAX_ADDR; i++) {
458 mdiodev = bus->mdio_map[i];
459 if (!mdiodev)
460 continue;
461
462 if (mdiodev->reset_gpio)
463 gpiod_put(mdiodev->reset_gpio);
464
465 mdiodev->device_remove(mdiodev);
466 mdiodev->device_free(mdiodev);
467 }
468
469
470 if (bus->reset_gpiod)
471 gpiod_set_value_cansleep(bus->reset_gpiod, 1);
472
473 device_del(&bus->dev);
474}
475EXPORT_SYMBOL(mdiobus_unregister);
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485void mdiobus_free(struct mii_bus *bus)
486{
487
488 if (bus->state == MDIOBUS_ALLOCATED) {
489 kfree(bus);
490 return;
491 }
492
493 BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
494 bus->state = MDIOBUS_RELEASED;
495
496 put_device(&bus->dev);
497}
498EXPORT_SYMBOL(mdiobus_free);
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512struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
513{
514 struct phy_device *phydev;
515 int err;
516
517 phydev = get_phy_device(bus, addr, false);
518 if (IS_ERR(phydev))
519 return phydev;
520
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525 of_mdiobus_link_mdiodev(bus, &phydev->mdio);
526
527 err = phy_device_register(phydev);
528 if (err) {
529 phy_device_free(phydev);
530 return ERR_PTR(-ENODEV);
531 }
532
533 return phydev;
534}
535EXPORT_SYMBOL(mdiobus_scan);
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547int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
548{
549 int retval;
550
551 WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
552
553 retval = bus->read(bus, addr, regnum);
554
555 trace_mdio_access(bus, 1, addr, regnum, retval, retval);
556
557 return retval;
558}
559EXPORT_SYMBOL(__mdiobus_read);
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572int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
573{
574 int err;
575
576 WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
577
578 err = bus->write(bus, addr, regnum, val);
579
580 trace_mdio_access(bus, 0, addr, regnum, val, err);
581
582 return err;
583}
584EXPORT_SYMBOL(__mdiobus_write);
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599int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)
600{
601 int retval;
602
603 BUG_ON(in_interrupt());
604
605 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
606 retval = __mdiobus_read(bus, addr, regnum);
607 mutex_unlock(&bus->mdio_lock);
608
609 return retval;
610}
611EXPORT_SYMBOL(mdiobus_read_nested);
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623int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
624{
625 int retval;
626
627 BUG_ON(in_interrupt());
628
629 mutex_lock(&bus->mdio_lock);
630 retval = __mdiobus_read(bus, addr, regnum);
631 mutex_unlock(&bus->mdio_lock);
632
633 return retval;
634}
635EXPORT_SYMBOL(mdiobus_read);
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651int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)
652{
653 int err;
654
655 BUG_ON(in_interrupt());
656
657 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
658 err = __mdiobus_write(bus, addr, regnum, val);
659 mutex_unlock(&bus->mdio_lock);
660
661 return err;
662}
663EXPORT_SYMBOL(mdiobus_write_nested);
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676int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
677{
678 int err;
679
680 BUG_ON(in_interrupt());
681
682 mutex_lock(&bus->mdio_lock);
683 err = __mdiobus_write(bus, addr, regnum, val);
684 mutex_unlock(&bus->mdio_lock);
685
686 return err;
687}
688EXPORT_SYMBOL(mdiobus_write);
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701static int mdio_bus_match(struct device *dev, struct device_driver *drv)
702{
703 struct mdio_device *mdio = to_mdio_device(dev);
704
705 if (of_driver_match_device(dev, drv))
706 return 1;
707
708 if (mdio->bus_match)
709 return mdio->bus_match(dev, drv);
710
711 return 0;
712}
713
714static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
715{
716 int rc;
717
718
719 rc = of_device_uevent_modalias(dev, env);
720 if (rc != -ENODEV)
721 return rc;
722
723 return 0;
724}
725
726struct bus_type mdio_bus_type = {
727 .name = "mdio_bus",
728 .match = mdio_bus_match,
729 .uevent = mdio_uevent,
730};
731EXPORT_SYMBOL(mdio_bus_type);
732
733int __init mdio_bus_init(void)
734{
735 int ret;
736
737 ret = class_register(&mdio_bus_class);
738 if (!ret) {
739 ret = bus_register(&mdio_bus_type);
740 if (ret)
741 class_unregister(&mdio_bus_class);
742 }
743
744 return ret;
745}
746EXPORT_SYMBOL_GPL(mdio_bus_init);
747
748#if IS_ENABLED(CONFIG_PHYLIB)
749void mdio_bus_exit(void)
750{
751 class_unregister(&mdio_bus_class);
752 bus_unregister(&mdio_bus_type);
753}
754EXPORT_SYMBOL_GPL(mdio_bus_exit);
755#else
756module_init(mdio_bus_init);
757
758MODULE_LICENSE("GPL");
759MODULE_DESCRIPTION("MDIO bus/device layer");
760#endif
761