1 /* Framework for finding and configuring PHYs.
2 * Also contains generic PHY driver
6 * Copyright (c) 2004 Freescale Semiconductor, Inc.
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/interrupt.h>
23 #include <linux/init.h>
24 #include <linux/delay.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/skbuff.h>
29 #include <linux/module.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/phy.h>
33 #include <linux/phy_led_triggers.h>
34 #include <linux/mdio.h>
36 #include <linux/uaccess.h>
41 MODULE_DESCRIPTION("PHY library");
42 MODULE_AUTHOR("Andy Fleming");
43 MODULE_LICENSE("GPL");
45 void phy_device_free(struct phy_device *phydev)
47 put_device(&phydev->mdio.dev);
49 EXPORT_SYMBOL(phy_device_free);
51 static void phy_mdio_device_free(struct mdio_device *mdiodev)
53 struct phy_device *phydev;
55 phydev = container_of(mdiodev, struct phy_device, mdio);
56 phy_device_free(phydev);
59 static void phy_device_release(struct device *dev)
61 kfree(to_phy_device(dev));
64 static void phy_mdio_device_remove(struct mdio_device *mdiodev)
66 struct phy_device *phydev;
68 phydev = container_of(mdiodev, struct phy_device, mdio);
69 phy_device_remove(phydev);
72 static struct phy_driver genphy_driver;
73 extern struct phy_driver genphy_10g_driver;
75 static LIST_HEAD(phy_fixup_list);
76 static DEFINE_MUTEX(phy_fixup_lock);
79 static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
81 struct device_driver *drv = phydev->mdio.dev.driver;
82 struct phy_driver *phydrv = to_phy_driver(drv);
83 struct net_device *netdev = phydev->attached_dev;
85 if (!drv || !phydrv->suspend)
88 /* PHY not attached? May suspend if the PHY has not already been
89 * suspended as part of a prior call to phy_disconnect() ->
90 * phy_detach() -> phy_suspend() because the parent netdev might be the
91 * MDIO bus driver and clock gated at this point.
94 return !phydev->suspended;
96 /* Don't suspend PHY if the attached netdev parent may wakeup.
97 * The parent may point to a PCI device, as in tg3 driver.
99 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
102 /* Also don't suspend PHY if the netdev itself may wakeup. This
103 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
106 if (device_may_wakeup(&netdev->dev))
112 static int mdio_bus_phy_suspend(struct device *dev)
114 struct phy_device *phydev = to_phy_device(dev);
116 /* We must stop the state machine manually, otherwise it stops out of
117 * control, possibly with the phydev->lock held. Upon resume, netdev
118 * may call phy routines that try to grab the same lock, and that may
119 * lead to a deadlock.
121 if (phydev->attached_dev && phydev->adjust_link)
122 phy_stop_machine(phydev);
124 if (!mdio_bus_phy_may_suspend(phydev))
127 return phy_suspend(phydev);
130 static int mdio_bus_phy_resume(struct device *dev)
132 struct phy_device *phydev = to_phy_device(dev);
135 if (!mdio_bus_phy_may_suspend(phydev))
138 ret = phy_resume(phydev);
143 if (phydev->attached_dev && phydev->adjust_link)
144 phy_start_machine(phydev);
149 static int mdio_bus_phy_restore(struct device *dev)
151 struct phy_device *phydev = to_phy_device(dev);
152 struct net_device *netdev = phydev->attached_dev;
158 ret = phy_init_hw(phydev);
162 /* The PHY needs to renegotiate. */
164 phydev->state = PHY_UP;
166 phy_start_machine(phydev);
171 static const struct dev_pm_ops mdio_bus_phy_pm_ops = {
172 .suspend = mdio_bus_phy_suspend,
173 .resume = mdio_bus_phy_resume,
174 .freeze = mdio_bus_phy_suspend,
175 .thaw = mdio_bus_phy_resume,
176 .restore = mdio_bus_phy_restore,
179 #define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops)
183 #define MDIO_BUS_PHY_PM_OPS NULL
185 #endif /* CONFIG_PM */
188 * phy_register_fixup - creates a new phy_fixup and adds it to the list
189 * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID)
190 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
191 * It can also be PHY_ANY_UID
192 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
194 * @run: The actual code to be run when a matching PHY is found
196 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
197 int (*run)(struct phy_device *))
199 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
204 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
205 fixup->phy_uid = phy_uid;
206 fixup->phy_uid_mask = phy_uid_mask;
209 mutex_lock(&phy_fixup_lock);
210 list_add_tail(&fixup->list, &phy_fixup_list);
211 mutex_unlock(&phy_fixup_lock);
215 EXPORT_SYMBOL(phy_register_fixup);
217 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
218 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
219 int (*run)(struct phy_device *))
221 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
223 EXPORT_SYMBOL(phy_register_fixup_for_uid);
225 /* Registers a fixup to be run on the PHY with id string bus_id */
226 int phy_register_fixup_for_id(const char *bus_id,
227 int (*run)(struct phy_device *))
229 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
231 EXPORT_SYMBOL(phy_register_fixup_for_id);
234 * phy_unregister_fixup - remove a phy_fixup from the list
235 * @bus_id: A string matches fixup->bus_id (or PHY_ANY_ID) in phy_fixup_list
236 * @phy_uid: A phy id matches fixup->phy_id (or PHY_ANY_UID) in phy_fixup_list
237 * @phy_uid_mask: Applied to phy_uid and fixup->phy_uid before comparison
239 int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask)
241 struct list_head *pos, *n;
242 struct phy_fixup *fixup;
247 mutex_lock(&phy_fixup_lock);
248 list_for_each_safe(pos, n, &phy_fixup_list) {
249 fixup = list_entry(pos, struct phy_fixup, list);
251 if ((!strcmp(fixup->bus_id, bus_id)) &&
252 ((fixup->phy_uid & phy_uid_mask) ==
253 (phy_uid & phy_uid_mask))) {
254 list_del(&fixup->list);
260 mutex_unlock(&phy_fixup_lock);
264 EXPORT_SYMBOL(phy_unregister_fixup);
266 /* Unregisters a fixup of any PHY with the UID in phy_uid */
267 int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask)
269 return phy_unregister_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask);
271 EXPORT_SYMBOL(phy_unregister_fixup_for_uid);
273 /* Unregisters a fixup of the PHY with id string bus_id */
274 int phy_unregister_fixup_for_id(const char *bus_id)
276 return phy_unregister_fixup(bus_id, PHY_ANY_UID, 0xffffffff);
278 EXPORT_SYMBOL(phy_unregister_fixup_for_id);
280 /* Returns 1 if fixup matches phydev in bus_id and phy_uid.
281 * Fixups can be set to match any in one or more fields.
283 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
285 if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0)
286 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
289 if ((fixup->phy_uid & fixup->phy_uid_mask) !=
290 (phydev->phy_id & fixup->phy_uid_mask))
291 if (fixup->phy_uid != PHY_ANY_UID)
297 /* Runs any matching fixups for this phydev */
298 static int phy_scan_fixups(struct phy_device *phydev)
300 struct phy_fixup *fixup;
302 mutex_lock(&phy_fixup_lock);
303 list_for_each_entry(fixup, &phy_fixup_list, list) {
304 if (phy_needs_fixup(phydev, fixup)) {
305 int err = fixup->run(phydev);
308 mutex_unlock(&phy_fixup_lock);
311 phydev->has_fixups = true;
314 mutex_unlock(&phy_fixup_lock);
319 static int phy_bus_match(struct device *dev, struct device_driver *drv)
321 struct phy_device *phydev = to_phy_device(dev);
322 struct phy_driver *phydrv = to_phy_driver(drv);
323 const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids);
326 if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY))
329 if (phydrv->match_phy_device)
330 return phydrv->match_phy_device(phydev);
332 if (phydev->is_c45) {
333 for (i = 1; i < num_ids; i++) {
334 if (!(phydev->c45_ids.devices_in_package & (1 << i)))
337 if ((phydrv->phy_id & phydrv->phy_id_mask) ==
338 (phydev->c45_ids.device_ids[i] &
339 phydrv->phy_id_mask))
344 return (phydrv->phy_id & phydrv->phy_id_mask) ==
345 (phydev->phy_id & phydrv->phy_id_mask);
349 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
351 struct phy_c45_device_ids *c45_ids)
353 struct phy_device *dev;
354 struct mdio_device *mdiodev;
356 /* We allocate the device, and initialize the default values */
357 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
359 return ERR_PTR(-ENOMEM);
361 mdiodev = &dev->mdio;
362 mdiodev->dev.release = phy_device_release;
363 mdiodev->dev.parent = &bus->dev;
364 mdiodev->dev.bus = &mdio_bus_type;
366 mdiodev->pm_ops = MDIO_BUS_PHY_PM_OPS;
367 mdiodev->bus_match = phy_bus_match;
368 mdiodev->addr = addr;
369 mdiodev->flags = MDIO_DEVICE_FLAG_PHY;
370 mdiodev->device_free = phy_mdio_device_free;
371 mdiodev->device_remove = phy_mdio_device_remove;
378 dev->interface = PHY_INTERFACE_MODE_GMII;
380 dev->autoneg = AUTONEG_ENABLE;
382 dev->is_c45 = is_c45;
383 dev->phy_id = phy_id;
385 dev->c45_ids = *c45_ids;
386 dev->irq = bus->irq[addr];
387 dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);
389 dev->state = PHY_DOWN;
391 mutex_init(&dev->lock);
392 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
393 INIT_WORK(&dev->phy_queue, phy_change_work);
395 /* Request the appropriate module unconditionally; don't
396 * bother trying to do so only if it isn't already loaded,
397 * because that gets complicated. A hotplug event would have
398 * done an unconditional modprobe anyway.
399 * We don't do normal hotplug because it won't work for MDIO
400 * -- because it relies on the device staying around for long
401 * enough for the driver to get loaded. With MDIO, the NIC
402 * driver will get bored and give up as soon as it finds that
403 * there's no driver _already_ loaded.
405 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id));
407 device_initialize(&mdiodev->dev);
411 EXPORT_SYMBOL(phy_device_create);
413 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers.
414 * @bus: the target MII bus
415 * @addr: PHY address on the MII bus
416 * @dev_addr: MMD address in the PHY.
417 * @devices_in_package: where to store the devices in package information.
419 * Description: reads devices in package registers of a MMD at @dev_addr
420 * from PHY at @addr on @bus.
422 * Returns: 0 on success, -EIO on failure.
424 static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
425 u32 *devices_in_package)
427 int phy_reg, reg_addr;
429 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2;
430 phy_reg = mdiobus_read(bus, addr, reg_addr);
433 *devices_in_package = (phy_reg & 0xffff) << 16;
435 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1;
436 phy_reg = mdiobus_read(bus, addr, reg_addr);
439 *devices_in_package |= (phy_reg & 0xffff);
445 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
446 * @bus: the target MII bus
447 * @addr: PHY address on the MII bus
448 * @phy_id: where to store the ID retrieved.
449 * @c45_ids: where to store the c45 ID information.
451 * If the PHY devices-in-package appears to be valid, it and the
452 * corresponding identifiers are stored in @c45_ids, zero is stored
453 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns
457 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
458 struct phy_c45_device_ids *c45_ids) {
461 const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
462 u32 *devs = &c45_ids->devices_in_package;
464 /* Find first non-zero Devices In package. Device zero is reserved
465 * for 802.3 c45 complied PHYs, so don't probe it at first.
467 for (i = 1; i < num_ids && *devs == 0; i++) {
468 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs);
472 if ((*devs & 0x1fffffff) == 0x1fffffff) {
473 /* If mostly Fs, there is no device there,
474 * then let's continue to probe more, as some
475 * 10G PHYs have zero Devices In package,
476 * e.g. Cortina CS4315/CS4340 PHY.
478 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs);
481 /* no device there, let's get out of here */
482 if ((*devs & 0x1fffffff) == 0x1fffffff) {
483 *phy_id = 0xffffffff;
491 /* Now probe Device Identifiers for each device present. */
492 for (i = 1; i < num_ids; i++) {
493 if (!(c45_ids->devices_in_package & (1 << i)))
496 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1;
497 phy_reg = mdiobus_read(bus, addr, reg_addr);
500 c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16;
502 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2;
503 phy_reg = mdiobus_read(bus, addr, reg_addr);
506 c45_ids->device_ids[i] |= (phy_reg & 0xffff);
513 * get_phy_id - reads the specified addr for its ID.
514 * @bus: the target MII bus
515 * @addr: PHY address on the MII bus
516 * @phy_id: where to store the ID retrieved.
517 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
518 * @c45_ids: where to store the c45 ID information.
520 * Description: In the case of a 802.3-c22 PHY, reads the ID registers
521 * of the PHY at @addr on the @bus, stores it in @phy_id and returns
524 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
525 * its return value is in turn returned.
528 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
529 bool is_c45, struct phy_c45_device_ids *c45_ids)
534 return get_phy_c45_ids(bus, addr, phy_id, c45_ids);
536 /* Grab the bits from PHYIR1, and put them in the upper half */
537 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
539 /* if there is no device, return without an error so scanning
540 * the bus works properly
542 if (phy_reg == -EIO || phy_reg == -ENODEV) {
543 *phy_id = 0xffffffff;
550 *phy_id = (phy_reg & 0xffff) << 16;
552 /* Grab the bits from PHYIR2, and put them in the lower half */
553 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
557 *phy_id |= (phy_reg & 0xffff);
563 * get_phy_device - reads the specified PHY device and returns its @phy_device
565 * @bus: the target MII bus
566 * @addr: PHY address on the MII bus
567 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
569 * Description: Reads the ID registers of the PHY at @addr on the
570 * @bus, then allocates and returns the phy_device to represent it.
572 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
574 struct phy_c45_device_ids c45_ids = {0};
578 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids);
582 /* If the phy_id is mostly Fs, there is no device there */
583 if ((phy_id & 0x1fffffff) == 0x1fffffff)
584 return ERR_PTR(-ENODEV);
586 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
588 EXPORT_SYMBOL(get_phy_device);
591 phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
593 struct phy_device *phydev = to_phy_device(dev);
595 return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
597 static DEVICE_ATTR_RO(phy_id);
600 phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
602 struct phy_device *phydev = to_phy_device(dev);
603 const char *mode = NULL;
605 if (phy_is_internal(phydev))
608 mode = phy_modes(phydev->interface);
610 return sprintf(buf, "%s\n", mode);
612 static DEVICE_ATTR_RO(phy_interface);
615 phy_has_fixups_show(struct device *dev, struct device_attribute *attr,
618 struct phy_device *phydev = to_phy_device(dev);
620 return sprintf(buf, "%d\n", phydev->has_fixups);
622 static DEVICE_ATTR_RO(phy_has_fixups);
624 static struct attribute *phy_dev_attrs[] = {
625 &dev_attr_phy_id.attr,
626 &dev_attr_phy_interface.attr,
627 &dev_attr_phy_has_fixups.attr,
630 ATTRIBUTE_GROUPS(phy_dev);
633 * phy_device_register - Register the phy device on the MDIO bus
634 * @phydev: phy_device structure to be added to the MDIO bus
636 int phy_device_register(struct phy_device *phydev)
640 err = mdiobus_register_device(&phydev->mdio);
644 /* Deassert the reset signal */
645 phy_device_reset(phydev, 0);
647 /* Run all of the fixups for this PHY */
648 err = phy_scan_fixups(phydev);
650 pr_err("PHY %d failed to initialize\n", phydev->mdio.addr);
654 phydev->mdio.dev.groups = phy_dev_groups;
656 err = device_add(&phydev->mdio.dev);
658 pr_err("PHY %d failed to add\n", phydev->mdio.addr);
665 /* Assert the reset signal */
666 phy_device_reset(phydev, 1);
668 mdiobus_unregister_device(&phydev->mdio);
671 EXPORT_SYMBOL(phy_device_register);
674 * phy_device_remove - Remove a previously registered phy device from the MDIO bus
675 * @phydev: phy_device structure to remove
677 * This doesn't free the phy_device itself, it merely reverses the effects
678 * of phy_device_register(). Use phy_device_free() to free the device
679 * after calling this function.
681 void phy_device_remove(struct phy_device *phydev)
683 device_del(&phydev->mdio.dev);
685 /* Assert the reset signal */
686 phy_device_reset(phydev, 1);
688 mdiobus_unregister_device(&phydev->mdio);
690 EXPORT_SYMBOL(phy_device_remove);
693 * phy_find_first - finds the first PHY device on the bus
694 * @bus: the target MII bus
696 struct phy_device *phy_find_first(struct mii_bus *bus)
698 struct phy_device *phydev;
701 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
702 phydev = mdiobus_get_phy(bus, addr);
708 EXPORT_SYMBOL(phy_find_first);
710 static void phy_link_change(struct phy_device *phydev, bool up, bool do_carrier)
712 struct net_device *netdev = phydev->attached_dev;
716 netif_carrier_on(netdev);
718 netif_carrier_off(netdev);
720 phydev->adjust_link(netdev);
724 * phy_prepare_link - prepares the PHY layer to monitor link status
725 * @phydev: target phy_device struct
726 * @handler: callback function for link status change notifications
728 * Description: Tells the PHY infrastructure to handle the
729 * gory details on monitoring link status (whether through
730 * polling or an interrupt), and to call back to the
731 * connected device driver when the link status changes.
732 * If you want to monitor your own link state, don't call
735 static void phy_prepare_link(struct phy_device *phydev,
736 void (*handler)(struct net_device *))
738 phydev->adjust_link = handler;
742 * phy_connect_direct - connect an ethernet device to a specific phy_device
743 * @dev: the network device to connect
744 * @phydev: the pointer to the phy device
745 * @handler: callback function for state change notifications
746 * @interface: PHY device's interface
748 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
749 void (*handler)(struct net_device *),
750 phy_interface_t interface)
754 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
758 phy_prepare_link(phydev, handler);
759 phy_start_machine(phydev);
761 phy_start_interrupts(phydev);
765 EXPORT_SYMBOL(phy_connect_direct);
768 * phy_connect - connect an ethernet device to a PHY device
769 * @dev: the network device to connect
770 * @bus_id: the id string of the PHY device to connect
771 * @handler: callback function for state change notifications
772 * @interface: PHY device's interface
774 * Description: Convenience function for connecting ethernet
775 * devices to PHY devices. The default behavior is for
776 * the PHY infrastructure to handle everything, and only notify
777 * the connected driver when the link status changes. If you
778 * don't want, or can't use the provided functionality, you may
779 * choose to call only the subset of functions which provide
780 * the desired functionality.
782 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
783 void (*handler)(struct net_device *),
784 phy_interface_t interface)
786 struct phy_device *phydev;
790 /* Search the list of PHY devices on the mdio bus for the
791 * PHY with the requested name
793 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
795 pr_err("PHY %s not found\n", bus_id);
796 return ERR_PTR(-ENODEV);
798 phydev = to_phy_device(d);
800 rc = phy_connect_direct(dev, phydev, handler, interface);
807 EXPORT_SYMBOL(phy_connect);
810 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
812 * @phydev: target phy_device struct
814 void phy_disconnect(struct phy_device *phydev)
817 phy_stop_interrupts(phydev);
819 phy_stop_machine(phydev);
821 phydev->adjust_link = NULL;
825 EXPORT_SYMBOL(phy_disconnect);
828 * phy_poll_reset - Safely wait until a PHY reset has properly completed
829 * @phydev: The PHY device to poll
831 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
832 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR
833 * register must be polled until the BMCR_RESET bit clears.
835 * Furthermore, any attempts to write to PHY registers may have no effect
836 * or even generate MDIO bus errors until this is complete.
838 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
839 * standard and do not fully reset after the BMCR_RESET bit is set, and may
840 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an
841 * effort to support such broken PHYs, this function is separate from the
842 * standard phy_init_hw() which will zero all the other bits in the BMCR
843 * and reapply all driver-specific and board-specific fixups.
845 static int phy_poll_reset(struct phy_device *phydev)
847 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
848 unsigned int retries = 12;
853 ret = phy_read(phydev, MII_BMCR);
856 } while (ret & BMCR_RESET && --retries);
857 if (ret & BMCR_RESET)
860 /* Some chips (smsc911x) may still need up to another 1ms after the
861 * BMCR_RESET bit is cleared before they are usable.
867 int phy_init_hw(struct phy_device *phydev)
871 /* Deassert the reset signal */
872 phy_device_reset(phydev, 0);
874 if (!phydev->drv || !phydev->drv->config_init)
877 if (phydev->drv->soft_reset)
878 ret = phydev->drv->soft_reset(phydev);
880 ret = genphy_soft_reset(phydev);
885 ret = phy_scan_fixups(phydev);
889 return phydev->drv->config_init(phydev);
891 EXPORT_SYMBOL(phy_init_hw);
893 void phy_attached_info(struct phy_device *phydev)
895 phy_attached_print(phydev, NULL);
897 EXPORT_SYMBOL(phy_attached_info);
899 #define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%s)"
900 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
902 const char *drv_name = phydev->drv ? phydev->drv->name : "unbound";
906 switch(phydev->irq) {
910 case PHY_IGNORE_INTERRUPT:
914 snprintf(irq_num, sizeof(irq_num), "%d", phydev->irq);
921 dev_info(&phydev->mdio.dev, ATTACHED_FMT "\n",
922 drv_name, phydev_name(phydev),
927 dev_info(&phydev->mdio.dev, ATTACHED_FMT,
928 drv_name, phydev_name(phydev),
936 EXPORT_SYMBOL(phy_attached_print);
939 * phy_attach_direct - attach a network device to a given PHY device pointer
940 * @dev: network device to attach
941 * @phydev: Pointer to phy_device to attach
942 * @flags: PHY device's dev_flags
943 * @interface: PHY device's interface
945 * Description: Called by drivers to attach to a particular PHY
946 * device. The phy_device is found, and properly hooked up
947 * to the phy_driver. If no driver is attached, then a
948 * generic driver is used. The phy_device is given a ptr to
949 * the attaching device, and given a callback for link status
950 * change. The phy_device is returned to the attaching driver.
951 * This function takes a reference on the phy device.
953 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
954 u32 flags, phy_interface_t interface)
956 struct module *ndev_owner = dev->dev.parent->driver->owner;
957 struct mii_bus *bus = phydev->mdio.bus;
958 struct device *d = &phydev->mdio.dev;
959 bool using_genphy = false;
962 /* For Ethernet device drivers that register their own MDIO bus, we
963 * will have bus->owner match ndev_mod, so we do not want to increment
964 * our own module->refcnt here, otherwise we would not be able to
967 if (ndev_owner != bus->owner && !try_module_get(bus->owner)) {
968 dev_err(&dev->dev, "failed to get the bus module\n");
974 /* Assume that if there is no driver, that it doesn't
975 * exist, and we should use the genphy driver.
979 d->driver = &genphy_10g_driver.mdiodrv.driver;
981 d->driver = &genphy_driver.mdiodrv.driver;
986 if (!try_module_get(d->driver->owner)) {
987 dev_err(&dev->dev, "failed to get the device driver module\n");
989 goto error_put_device;
993 err = d->driver->probe(d);
995 err = device_bind_driver(d);
998 goto error_module_put;
1001 if (phydev->attached_dev) {
1002 dev_err(&dev->dev, "PHY already attached\n");
1007 phydev->phy_link_change = phy_link_change;
1008 phydev->attached_dev = dev;
1009 dev->phydev = phydev;
1011 /* Some Ethernet drivers try to connect to a PHY device before
1012 * calling register_netdevice() -> netdev_register_kobject() and
1013 * does the dev->dev.kobj initialization. Here we only check for
1014 * success which indicates that the network device kobject is
1015 * ready. Once we do that we still need to keep track of whether
1016 * links were successfully set up or not for phy_detach() to
1017 * remove them accordingly.
1019 phydev->sysfs_links = false;
1021 err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj,
1024 err = sysfs_create_link_nowarn(&dev->dev.kobj,
1025 &phydev->mdio.dev.kobj,
1028 dev_err(&dev->dev, "could not add device link to %s err %d\n",
1029 kobject_name(&phydev->mdio.dev.kobj),
1031 /* non-fatal - some net drivers can use one netdevice
1032 * with more then one phy
1036 phydev->sysfs_links = true;
1039 phydev->dev_flags = flags;
1041 phydev->interface = interface;
1043 phydev->state = PHY_READY;
1045 /* Initial carrier state is off as the phy is about to be
1048 netif_carrier_off(phydev->attached_dev);
1050 /* Do initial configuration here, now that
1051 * we have certain key parameters
1052 * (dev_flags and interface)
1054 err = phy_init_hw(phydev);
1059 phy_led_triggers_register(phydev);
1064 /* phy_detach() does all of the cleanup below */
1069 module_put(d->driver->owner);
1072 if (ndev_owner != bus->owner)
1073 module_put(bus->owner);
1076 EXPORT_SYMBOL(phy_attach_direct);
1079 * phy_attach - attach a network device to a particular PHY device
1080 * @dev: network device to attach
1081 * @bus_id: Bus ID of PHY device to attach
1082 * @interface: PHY device's interface
1084 * Description: Same as phy_attach_direct() except that a PHY bus_id
1085 * string is passed instead of a pointer to a struct phy_device.
1087 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
1088 phy_interface_t interface)
1090 struct bus_type *bus = &mdio_bus_type;
1091 struct phy_device *phydev;
1095 /* Search the list of PHY devices on the mdio bus for the
1096 * PHY with the requested name
1098 d = bus_find_device_by_name(bus, NULL, bus_id);
1100 pr_err("PHY %s not found\n", bus_id);
1101 return ERR_PTR(-ENODEV);
1103 phydev = to_phy_device(d);
1105 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
1112 EXPORT_SYMBOL(phy_attach);
1115 * phy_detach - detach a PHY device from its network device
1116 * @phydev: target phy_device struct
1118 * This detaches the phy device from its network device and the phy
1119 * driver, and drops the reference count taken in phy_attach_direct().
1121 void phy_detach(struct phy_device *phydev)
1123 struct net_device *dev = phydev->attached_dev;
1124 struct module *ndev_owner = dev->dev.parent->driver->owner;
1125 struct mii_bus *bus;
1127 if (phydev->sysfs_links) {
1128 sysfs_remove_link(&dev->dev.kobj, "phydev");
1129 sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
1131 phydev->attached_dev->phydev = NULL;
1132 phydev->attached_dev = NULL;
1133 phy_suspend(phydev);
1134 phydev->phylink = NULL;
1136 phy_led_triggers_unregister(phydev);
1138 module_put(phydev->mdio.dev.driver->owner);
1140 /* If the device had no specific driver before (i.e. - it
1141 * was using the generic driver), we unbind the device
1142 * from the generic driver so that there's a chance a
1143 * real driver could be loaded
1145 if (phydev->mdio.dev.driver == &genphy_10g_driver.mdiodrv.driver ||
1146 phydev->mdio.dev.driver == &genphy_driver.mdiodrv.driver)
1147 device_release_driver(&phydev->mdio.dev);
1150 * The phydev might go away on the put_device() below, so avoid
1151 * a use-after-free bug by reading the underlying bus first.
1153 bus = phydev->mdio.bus;
1155 put_device(&phydev->mdio.dev);
1156 if (ndev_owner != bus->owner)
1157 module_put(bus->owner);
1159 /* Assert the reset signal */
1160 phy_device_reset(phydev, 1);
1162 EXPORT_SYMBOL(phy_detach);
1164 int phy_suspend(struct phy_device *phydev)
1166 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
1167 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
1170 /* If the device has WOL enabled, we cannot suspend the PHY */
1171 phy_ethtool_get_wol(phydev, &wol);
1175 if (phydev->drv && phydrv->suspend)
1176 ret = phydrv->suspend(phydev);
1181 phydev->suspended = true;
1185 EXPORT_SYMBOL(phy_suspend);
1187 int __phy_resume(struct phy_device *phydev)
1189 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
1192 WARN_ON(!mutex_is_locked(&phydev->lock));
1194 if (phydev->drv && phydrv->resume)
1195 ret = phydrv->resume(phydev);
1200 phydev->suspended = false;
1204 EXPORT_SYMBOL(__phy_resume);
1206 int phy_resume(struct phy_device *phydev)
1210 mutex_lock(&phydev->lock);
1211 ret = __phy_resume(phydev);
1212 mutex_unlock(&phydev->lock);
1216 EXPORT_SYMBOL(phy_resume);
1218 int phy_loopback(struct phy_device *phydev, bool enable)
1220 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
1223 mutex_lock(&phydev->lock);
1225 if (enable && phydev->loopback_enabled) {
1230 if (!enable && !phydev->loopback_enabled) {
1235 if (phydev->drv && phydrv->set_loopback)
1236 ret = phydrv->set_loopback(phydev, enable);
1243 phydev->loopback_enabled = enable;
1246 mutex_unlock(&phydev->lock);
1249 EXPORT_SYMBOL(phy_loopback);
1252 * phy_reset_after_clk_enable - perform a PHY reset if needed
1253 * @phydev: target phy_device struct
1255 * Description: Some PHYs are known to need a reset after their refclk was
1256 * enabled. This function evaluates the flags and perform the reset if it's
1257 * needed. Returns < 0 on error, 0 if the phy wasn't reset and 1 if the phy
1260 int phy_reset_after_clk_enable(struct phy_device *phydev)
1262 if (!phydev || !phydev->drv)
1265 if (phydev->drv->flags & PHY_RST_AFTER_CLK_EN) {
1266 phy_device_reset(phydev, 1);
1267 phy_device_reset(phydev, 0);
1273 EXPORT_SYMBOL(phy_reset_after_clk_enable);
1275 /* Generic PHY support and helper functions */
1278 * genphy_config_advert - sanitize and advertise auto-negotiation parameters
1279 * @phydev: target phy_device struct
1281 * Description: Writes MII_ADVERTISE with the appropriate values,
1282 * after sanitizing the values to make sure we only advertise
1283 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
1284 * hasn't changed, and > 0 if it has changed.
1286 static int genphy_config_advert(struct phy_device *phydev)
1289 int oldadv, adv, bmsr;
1290 int err, changed = 0;
1292 /* Only allow advertising what this PHY supports */
1293 phydev->advertising &= phydev->supported;
1294 advertise = phydev->advertising;
1296 /* Setup standard advertisement */
1297 adv = phy_read(phydev, MII_ADVERTISE);
1302 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
1303 ADVERTISE_PAUSE_ASYM);
1304 adv |= ethtool_adv_to_mii_adv_t(advertise);
1306 if (adv != oldadv) {
1307 err = phy_write(phydev, MII_ADVERTISE, adv);
1314 bmsr = phy_read(phydev, MII_BMSR);
1318 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
1319 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
1322 if (!(bmsr & BMSR_ESTATEN))
1325 /* Configure gigabit if it's supported */
1326 adv = phy_read(phydev, MII_CTRL1000);
1331 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
1333 if (phydev->supported & (SUPPORTED_1000baseT_Half |
1334 SUPPORTED_1000baseT_Full)) {
1335 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
1341 err = phy_write(phydev, MII_CTRL1000, adv);
1349 * genphy_config_eee_advert - disable unwanted eee mode advertisement
1350 * @phydev: target phy_device struct
1352 * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy
1353 * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't
1354 * changed, and 1 if it has changed.
1356 static int genphy_config_eee_advert(struct phy_device *phydev)
1358 int broken = phydev->eee_broken_modes;
1361 /* Nothing to disable */
1365 /* If the following call fails, we assume that EEE is not
1366 * supported by the phy. If we read 0, EEE is not advertised
1367 * In both case, we don't need to continue
1369 adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1376 /* Advertising remains unchanged with the broken mask */
1380 phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1386 * genphy_setup_forced - configures/forces speed/duplex from @phydev
1387 * @phydev: target phy_device struct
1389 * Description: Configures MII_BMCR to force speed/duplex
1390 * to the values in phydev. Assumes that the values are valid.
1391 * Please see phy_sanitize_settings().
1393 int genphy_setup_forced(struct phy_device *phydev)
1398 phydev->asym_pause = 0;
1400 if (SPEED_1000 == phydev->speed)
1401 ctl |= BMCR_SPEED1000;
1402 else if (SPEED_100 == phydev->speed)
1403 ctl |= BMCR_SPEED100;
1405 if (DUPLEX_FULL == phydev->duplex)
1406 ctl |= BMCR_FULLDPLX;
1408 return phy_modify(phydev, MII_BMCR,
1409 ~(BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN), ctl);
1411 EXPORT_SYMBOL(genphy_setup_forced);
1414 * genphy_restart_aneg - Enable and Restart Autonegotiation
1415 * @phydev: target phy_device struct
1417 int genphy_restart_aneg(struct phy_device *phydev)
1419 /* Don't isolate the PHY if we're negotiating */
1420 return phy_modify(phydev, MII_BMCR, BMCR_ISOLATE,
1421 BMCR_ANENABLE | BMCR_ANRESTART);
1423 EXPORT_SYMBOL(genphy_restart_aneg);
1426 * genphy_config_aneg - restart auto-negotiation or write BMCR
1427 * @phydev: target phy_device struct
1429 * Description: If auto-negotiation is enabled, we configure the
1430 * advertising, and then restart auto-negotiation. If it is not
1431 * enabled, then we write the BMCR.
1433 int genphy_config_aneg(struct phy_device *phydev)
1437 changed = genphy_config_eee_advert(phydev);
1439 if (AUTONEG_ENABLE != phydev->autoneg)
1440 return genphy_setup_forced(phydev);
1442 err = genphy_config_advert(phydev);
1443 if (err < 0) /* error */
1449 /* Advertisement hasn't changed, but maybe aneg was never on to
1450 * begin with? Or maybe phy was isolated?
1452 int ctl = phy_read(phydev, MII_BMCR);
1457 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
1458 changed = 1; /* do restart aneg */
1461 /* Only restart aneg if we are advertising something different
1462 * than we were before.
1465 return genphy_restart_aneg(phydev);
1469 EXPORT_SYMBOL(genphy_config_aneg);
1472 * genphy_aneg_done - return auto-negotiation status
1473 * @phydev: target phy_device struct
1475 * Description: Reads the status register and returns 0 either if
1476 * auto-negotiation is incomplete, or if there was an error.
1477 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
1479 int genphy_aneg_done(struct phy_device *phydev)
1481 int retval = phy_read(phydev, MII_BMSR);
1483 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1485 EXPORT_SYMBOL(genphy_aneg_done);
1488 * genphy_update_link - update link status in @phydev
1489 * @phydev: target phy_device struct
1491 * Description: Update the value in phydev->link to reflect the
1492 * current link value. In order to do this, we need to read
1493 * the status register twice, keeping the second value.
1495 int genphy_update_link(struct phy_device *phydev)
1499 /* Do a fake read */
1500 status = phy_read(phydev, MII_BMSR);
1504 /* Read link and autonegotiation status */
1505 status = phy_read(phydev, MII_BMSR);
1509 if ((status & BMSR_LSTATUS) == 0)
1516 EXPORT_SYMBOL(genphy_update_link);
1519 * genphy_read_status - check the link status and update current link state
1520 * @phydev: target phy_device struct
1522 * Description: Check the link, then figure out the current state
1523 * by comparing what we advertise with what the link partner
1524 * advertises. Start by checking the gigabit possibilities,
1525 * then move on to 10/100.
1527 int genphy_read_status(struct phy_device *phydev)
1534 int common_adv_gb = 0;
1536 /* Update the link, but return if there was an error */
1537 err = genphy_update_link(phydev);
1541 phydev->lp_advertising = 0;
1543 if (AUTONEG_ENABLE == phydev->autoneg) {
1544 if (phydev->supported & (SUPPORTED_1000baseT_Half
1545 | SUPPORTED_1000baseT_Full)) {
1546 lpagb = phy_read(phydev, MII_STAT1000);
1550 adv = phy_read(phydev, MII_CTRL1000);
1554 phydev->lp_advertising =
1555 mii_stat1000_to_ethtool_lpa_t(lpagb);
1556 common_adv_gb = lpagb & adv << 2;
1559 lpa = phy_read(phydev, MII_LPA);
1563 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa);
1565 adv = phy_read(phydev, MII_ADVERTISE);
1569 common_adv = lpa & adv;
1571 phydev->speed = SPEED_10;
1572 phydev->duplex = DUPLEX_HALF;
1574 phydev->asym_pause = 0;
1576 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) {
1577 phydev->speed = SPEED_1000;
1579 if (common_adv_gb & LPA_1000FULL)
1580 phydev->duplex = DUPLEX_FULL;
1581 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) {
1582 phydev->speed = SPEED_100;
1584 if (common_adv & LPA_100FULL)
1585 phydev->duplex = DUPLEX_FULL;
1587 if (common_adv & LPA_10FULL)
1588 phydev->duplex = DUPLEX_FULL;
1590 if (phydev->duplex == DUPLEX_FULL) {
1591 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
1592 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
1595 int bmcr = phy_read(phydev, MII_BMCR);
1600 if (bmcr & BMCR_FULLDPLX)
1601 phydev->duplex = DUPLEX_FULL;
1603 phydev->duplex = DUPLEX_HALF;
1605 if (bmcr & BMCR_SPEED1000)
1606 phydev->speed = SPEED_1000;
1607 else if (bmcr & BMCR_SPEED100)
1608 phydev->speed = SPEED_100;
1610 phydev->speed = SPEED_10;
1613 phydev->asym_pause = 0;
1618 EXPORT_SYMBOL(genphy_read_status);
1621 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
1622 * @phydev: target phy_device struct
1624 * Description: Perform a software PHY reset using the standard
1625 * BMCR_RESET bit and poll for the reset bit to be cleared.
1627 * Returns: 0 on success, < 0 on failure
1629 int genphy_soft_reset(struct phy_device *phydev)
1633 ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
1637 return phy_poll_reset(phydev);
1639 EXPORT_SYMBOL(genphy_soft_reset);
1641 int genphy_config_init(struct phy_device *phydev)
1646 features = (SUPPORTED_TP | SUPPORTED_MII
1647 | SUPPORTED_AUI | SUPPORTED_FIBRE |
1648 SUPPORTED_BNC | SUPPORTED_Pause | SUPPORTED_Asym_Pause);
1650 /* Do we support autonegotiation? */
1651 val = phy_read(phydev, MII_BMSR);
1655 if (val & BMSR_ANEGCAPABLE)
1656 features |= SUPPORTED_Autoneg;
1658 if (val & BMSR_100FULL)
1659 features |= SUPPORTED_100baseT_Full;
1660 if (val & BMSR_100HALF)
1661 features |= SUPPORTED_100baseT_Half;
1662 if (val & BMSR_10FULL)
1663 features |= SUPPORTED_10baseT_Full;
1664 if (val & BMSR_10HALF)
1665 features |= SUPPORTED_10baseT_Half;
1667 if (val & BMSR_ESTATEN) {
1668 val = phy_read(phydev, MII_ESTATUS);
1672 if (val & ESTATUS_1000_TFULL)
1673 features |= SUPPORTED_1000baseT_Full;
1674 if (val & ESTATUS_1000_THALF)
1675 features |= SUPPORTED_1000baseT_Half;
1678 phydev->supported &= features;
1679 phydev->advertising &= features;
1683 EXPORT_SYMBOL(genphy_config_init);
1685 /* This is used for the phy device which doesn't support the MMD extended
1686 * register access, but it does have side effect when we are trying to access
1687 * the MMD register via indirect method.
1689 int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, u16 regnum)
1693 EXPORT_SYMBOL(genphy_read_mmd_unsupported);
1695 int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum,
1696 u16 regnum, u16 val)
1700 EXPORT_SYMBOL(genphy_write_mmd_unsupported);
1702 int genphy_suspend(struct phy_device *phydev)
1704 return phy_set_bits(phydev, MII_BMCR, BMCR_PDOWN);
1706 EXPORT_SYMBOL(genphy_suspend);
1708 int genphy_resume(struct phy_device *phydev)
1710 return phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN);
1712 EXPORT_SYMBOL(genphy_resume);
1714 int genphy_loopback(struct phy_device *phydev, bool enable)
1716 return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
1717 enable ? BMCR_LOOPBACK : 0);
1719 EXPORT_SYMBOL(genphy_loopback);
1721 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
1723 /* The default values for phydev->supported are provided by the PHY
1724 * driver "features" member, we want to reset to sane defaults first
1725 * before supporting higher speeds.
1727 phydev->supported &= PHY_DEFAULT_FEATURES;
1729 switch (max_speed) {
1733 phydev->supported |= PHY_1000BT_FEATURES;
1736 phydev->supported |= PHY_100BT_FEATURES;
1739 phydev->supported |= PHY_10BT_FEATURES;
1745 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed)
1749 err = __set_phy_supported(phydev, max_speed);
1753 phydev->advertising = phydev->supported;
1757 EXPORT_SYMBOL(phy_set_max_speed);
1759 static void of_set_phy_supported(struct phy_device *phydev)
1761 struct device_node *node = phydev->mdio.dev.of_node;
1764 if (!IS_ENABLED(CONFIG_OF_MDIO))
1770 if (!of_property_read_u32(node, "max-speed", &max_speed))
1771 __set_phy_supported(phydev, max_speed);
1774 static void of_set_phy_eee_broken(struct phy_device *phydev)
1776 struct device_node *node = phydev->mdio.dev.of_node;
1779 if (!IS_ENABLED(CONFIG_OF_MDIO))
1785 if (of_property_read_bool(node, "eee-broken-100tx"))
1786 broken |= MDIO_EEE_100TX;
1787 if (of_property_read_bool(node, "eee-broken-1000t"))
1788 broken |= MDIO_EEE_1000T;
1789 if (of_property_read_bool(node, "eee-broken-10gt"))
1790 broken |= MDIO_EEE_10GT;
1791 if (of_property_read_bool(node, "eee-broken-1000kx"))
1792 broken |= MDIO_EEE_1000KX;
1793 if (of_property_read_bool(node, "eee-broken-10gkx4"))
1794 broken |= MDIO_EEE_10GKX4;
1795 if (of_property_read_bool(node, "eee-broken-10gkr"))
1796 broken |= MDIO_EEE_10GKR;
1798 phydev->eee_broken_modes = broken;
1802 * phy_probe - probe and init a PHY device
1803 * @dev: device to probe and init
1805 * Description: Take care of setting up the phy_device structure,
1806 * set the state to READY (the driver's init function should
1807 * set it to STARTING if needed).
1809 static int phy_probe(struct device *dev)
1811 struct phy_device *phydev = to_phy_device(dev);
1812 struct device_driver *drv = phydev->mdio.dev.driver;
1813 struct phy_driver *phydrv = to_phy_driver(drv);
1816 phydev->drv = phydrv;
1818 /* Disable the interrupt if the PHY doesn't support it
1819 * but the interrupt is still a valid one
1821 if (!(phydrv->flags & PHY_HAS_INTERRUPT) &&
1822 phy_interrupt_is_valid(phydev))
1823 phydev->irq = PHY_POLL;
1825 if (phydrv->flags & PHY_IS_INTERNAL)
1826 phydev->is_internal = true;
1828 mutex_lock(&phydev->lock);
1830 /* Start out supporting everything. Eventually,
1831 * a controller will attach, and may modify one
1832 * or both of these values
1834 phydev->supported = phydrv->features;
1835 of_set_phy_supported(phydev);
1836 phydev->advertising = phydev->supported;
1838 /* Get the EEE modes we want to prohibit. We will ask
1839 * the PHY stop advertising these mode later on
1841 of_set_phy_eee_broken(phydev);
1843 /* The Pause Frame bits indicate that the PHY can support passing
1844 * pause frames. During autonegotiation, the PHYs will determine if
1845 * they should allow pause frames to pass. The MAC driver should then
1846 * use that result to determine whether to enable flow control via
1849 * Normally, PHY drivers should not set the Pause bits, and instead
1850 * allow phylib to do that. However, there may be some situations
1851 * (e.g. hardware erratum) where the driver wants to set only one
1854 if (phydrv->features & (SUPPORTED_Pause | SUPPORTED_Asym_Pause)) {
1855 phydev->supported &= ~(SUPPORTED_Pause | SUPPORTED_Asym_Pause);
1856 phydev->supported |= phydrv->features &
1857 (SUPPORTED_Pause | SUPPORTED_Asym_Pause);
1859 phydev->supported |= SUPPORTED_Pause | SUPPORTED_Asym_Pause;
1862 /* Set the state to READY by default */
1863 phydev->state = PHY_READY;
1865 if (phydev->drv->probe) {
1866 /* Deassert the reset signal */
1867 phy_device_reset(phydev, 0);
1869 err = phydev->drv->probe(phydev);
1871 /* Assert the reset signal */
1872 phy_device_reset(phydev, 1);
1876 mutex_unlock(&phydev->lock);
1881 static int phy_remove(struct device *dev)
1883 struct phy_device *phydev = to_phy_device(dev);
1885 cancel_delayed_work_sync(&phydev->state_queue);
1887 mutex_lock(&phydev->lock);
1888 phydev->state = PHY_DOWN;
1889 mutex_unlock(&phydev->lock);
1891 if (phydev->drv && phydev->drv->remove) {
1892 phydev->drv->remove(phydev);
1894 /* Assert the reset signal */
1895 phy_device_reset(phydev, 1);
1903 * phy_driver_register - register a phy_driver with the PHY layer
1904 * @new_driver: new phy_driver to register
1905 * @owner: module owning this PHY
1907 int phy_driver_register(struct phy_driver *new_driver, struct module *owner)
1911 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY;
1912 new_driver->mdiodrv.driver.name = new_driver->name;
1913 new_driver->mdiodrv.driver.bus = &mdio_bus_type;
1914 new_driver->mdiodrv.driver.probe = phy_probe;
1915 new_driver->mdiodrv.driver.remove = phy_remove;
1916 new_driver->mdiodrv.driver.owner = owner;
1918 retval = driver_register(&new_driver->mdiodrv.driver);
1920 pr_err("%s: Error %d in registering driver\n",
1921 new_driver->name, retval);
1926 pr_debug("%s: Registered new driver\n", new_driver->name);
1930 EXPORT_SYMBOL(phy_driver_register);
1932 int phy_drivers_register(struct phy_driver *new_driver, int n,
1933 struct module *owner)
1937 for (i = 0; i < n; i++) {
1938 ret = phy_driver_register(new_driver + i, owner);
1941 phy_driver_unregister(new_driver + i);
1947 EXPORT_SYMBOL(phy_drivers_register);
1949 void phy_driver_unregister(struct phy_driver *drv)
1951 driver_unregister(&drv->mdiodrv.driver);
1953 EXPORT_SYMBOL(phy_driver_unregister);
1955 void phy_drivers_unregister(struct phy_driver *drv, int n)
1959 for (i = 0; i < n; i++)
1960 phy_driver_unregister(drv + i);
1962 EXPORT_SYMBOL(phy_drivers_unregister);
1964 static struct phy_driver genphy_driver = {
1965 .phy_id = 0xffffffff,
1966 .phy_id_mask = 0xffffffff,
1967 .name = "Generic PHY",
1968 .soft_reset = genphy_no_soft_reset,
1969 .config_init = genphy_config_init,
1970 .features = PHY_GBIT_FEATURES | SUPPORTED_MII |
1971 SUPPORTED_AUI | SUPPORTED_FIBRE |
1973 .aneg_done = genphy_aneg_done,
1974 .suspend = genphy_suspend,
1975 .resume = genphy_resume,
1976 .set_loopback = genphy_loopback,
1979 static int __init phy_init(void)
1983 rc = mdio_bus_init();
1987 rc = phy_driver_register(&genphy_10g_driver, THIS_MODULE);
1991 rc = phy_driver_register(&genphy_driver, THIS_MODULE);
1993 phy_driver_unregister(&genphy_10g_driver);
2001 static void __exit phy_exit(void)
2003 phy_driver_unregister(&genphy_10g_driver);
2004 phy_driver_unregister(&genphy_driver);
2008 subsys_initcall(phy_init);
2009 module_exit(phy_exit);