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);
78 static struct phy_driver genphy_driver[GENPHY_DRV_MAX];
80 static LIST_HEAD(phy_fixup_list);
81 static DEFINE_MUTEX(phy_fixup_lock);
84 static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
86 struct device_driver *drv = phydev->mdio.dev.driver;
87 struct phy_driver *phydrv = to_phy_driver(drv);
88 struct net_device *netdev = phydev->attached_dev;
90 if (!drv || !phydrv->suspend)
93 /* PHY not attached? May suspend if the PHY has not already been
94 * suspended as part of a prior call to phy_disconnect() ->
95 * phy_detach() -> phy_suspend() because the parent netdev might be the
96 * MDIO bus driver and clock gated at this point.
99 return !phydev->suspended;
101 /* Don't suspend PHY if the attached netdev parent may wakeup.
102 * The parent may point to a PCI device, as in tg3 driver.
104 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
107 /* Also don't suspend PHY if the netdev itself may wakeup. This
108 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
111 if (device_may_wakeup(&netdev->dev))
117 static int mdio_bus_phy_suspend(struct device *dev)
119 struct phy_device *phydev = to_phy_device(dev);
121 /* We must stop the state machine manually, otherwise it stops out of
122 * control, possibly with the phydev->lock held. Upon resume, netdev
123 * may call phy routines that try to grab the same lock, and that may
124 * lead to a deadlock.
126 if (phydev->attached_dev && phydev->adjust_link)
127 phy_stop_machine(phydev);
129 if (!mdio_bus_phy_may_suspend(phydev))
132 return phy_suspend(phydev);
135 static int mdio_bus_phy_resume(struct device *dev)
137 struct phy_device *phydev = to_phy_device(dev);
140 if (!mdio_bus_phy_may_suspend(phydev))
143 ret = phy_resume(phydev);
148 if (phydev->attached_dev && phydev->adjust_link)
149 phy_start_machine(phydev);
154 static int mdio_bus_phy_restore(struct device *dev)
156 struct phy_device *phydev = to_phy_device(dev);
157 struct net_device *netdev = phydev->attached_dev;
163 ret = phy_init_hw(phydev);
167 /* The PHY needs to renegotiate. */
169 phydev->state = PHY_UP;
171 phy_start_machine(phydev);
176 static const struct dev_pm_ops mdio_bus_phy_pm_ops = {
177 .suspend = mdio_bus_phy_suspend,
178 .resume = mdio_bus_phy_resume,
179 .freeze = mdio_bus_phy_suspend,
180 .thaw = mdio_bus_phy_resume,
181 .restore = mdio_bus_phy_restore,
184 #define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops)
188 #define MDIO_BUS_PHY_PM_OPS NULL
190 #endif /* CONFIG_PM */
193 * phy_register_fixup - creates a new phy_fixup and adds it to the list
194 * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID)
195 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
196 * It can also be PHY_ANY_UID
197 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
199 * @run: The actual code to be run when a matching PHY is found
201 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
202 int (*run)(struct phy_device *))
204 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
209 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
210 fixup->phy_uid = phy_uid;
211 fixup->phy_uid_mask = phy_uid_mask;
214 mutex_lock(&phy_fixup_lock);
215 list_add_tail(&fixup->list, &phy_fixup_list);
216 mutex_unlock(&phy_fixup_lock);
220 EXPORT_SYMBOL(phy_register_fixup);
222 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
223 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
224 int (*run)(struct phy_device *))
226 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
228 EXPORT_SYMBOL(phy_register_fixup_for_uid);
230 /* Registers a fixup to be run on the PHY with id string bus_id */
231 int phy_register_fixup_for_id(const char *bus_id,
232 int (*run)(struct phy_device *))
234 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
236 EXPORT_SYMBOL(phy_register_fixup_for_id);
238 /* Returns 1 if fixup matches phydev in bus_id and phy_uid.
239 * Fixups can be set to match any in one or more fields.
241 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
243 if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0)
244 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
247 if ((fixup->phy_uid & fixup->phy_uid_mask) !=
248 (phydev->phy_id & fixup->phy_uid_mask))
249 if (fixup->phy_uid != PHY_ANY_UID)
255 /* Runs any matching fixups for this phydev */
256 static int phy_scan_fixups(struct phy_device *phydev)
258 struct phy_fixup *fixup;
260 mutex_lock(&phy_fixup_lock);
261 list_for_each_entry(fixup, &phy_fixup_list, list) {
262 if (phy_needs_fixup(phydev, fixup)) {
263 int err = fixup->run(phydev);
266 mutex_unlock(&phy_fixup_lock);
269 phydev->has_fixups = true;
272 mutex_unlock(&phy_fixup_lock);
277 static int phy_bus_match(struct device *dev, struct device_driver *drv)
279 struct phy_device *phydev = to_phy_device(dev);
280 struct phy_driver *phydrv = to_phy_driver(drv);
281 const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids);
284 if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY))
287 if (phydrv->match_phy_device)
288 return phydrv->match_phy_device(phydev);
290 if (phydev->is_c45) {
291 for (i = 1; i < num_ids; i++) {
292 if (!(phydev->c45_ids.devices_in_package & (1 << i)))
295 if ((phydrv->phy_id & phydrv->phy_id_mask) ==
296 (phydev->c45_ids.device_ids[i] &
297 phydrv->phy_id_mask))
302 return (phydrv->phy_id & phydrv->phy_id_mask) ==
303 (phydev->phy_id & phydrv->phy_id_mask);
307 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
309 struct phy_c45_device_ids *c45_ids)
311 struct phy_device *dev;
312 struct mdio_device *mdiodev;
314 /* We allocate the device, and initialize the default values */
315 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
317 return ERR_PTR(-ENOMEM);
319 mdiodev = &dev->mdio;
320 mdiodev->dev.release = phy_device_release;
321 mdiodev->dev.parent = &bus->dev;
322 mdiodev->dev.bus = &mdio_bus_type;
324 mdiodev->pm_ops = MDIO_BUS_PHY_PM_OPS;
325 mdiodev->bus_match = phy_bus_match;
326 mdiodev->addr = addr;
327 mdiodev->flags = MDIO_DEVICE_FLAG_PHY;
328 mdiodev->device_free = phy_mdio_device_free;
329 mdiodev->device_remove = phy_mdio_device_remove;
336 dev->interface = PHY_INTERFACE_MODE_GMII;
338 dev->autoneg = AUTONEG_ENABLE;
340 dev->is_c45 = is_c45;
341 dev->phy_id = phy_id;
343 dev->c45_ids = *c45_ids;
344 dev->irq = bus->irq[addr];
345 dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);
347 dev->state = PHY_DOWN;
349 mutex_init(&dev->lock);
350 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
351 INIT_WORK(&dev->phy_queue, phy_change_work);
353 /* Request the appropriate module unconditionally; don't
354 * bother trying to do so only if it isn't already loaded,
355 * because that gets complicated. A hotplug event would have
356 * done an unconditional modprobe anyway.
357 * We don't do normal hotplug because it won't work for MDIO
358 * -- because it relies on the device staying around for long
359 * enough for the driver to get loaded. With MDIO, the NIC
360 * driver will get bored and give up as soon as it finds that
361 * there's no driver _already_ loaded.
363 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id));
365 device_initialize(&mdiodev->dev);
369 EXPORT_SYMBOL(phy_device_create);
371 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers.
372 * @bus: the target MII bus
373 * @addr: PHY address on the MII bus
374 * @dev_addr: MMD address in the PHY.
375 * @devices_in_package: where to store the devices in package information.
377 * Description: reads devices in package registers of a MMD at @dev_addr
378 * from PHY at @addr on @bus.
380 * Returns: 0 on success, -EIO on failure.
382 static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
383 u32 *devices_in_package)
385 int phy_reg, reg_addr;
387 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2;
388 phy_reg = mdiobus_read(bus, addr, reg_addr);
391 *devices_in_package = (phy_reg & 0xffff) << 16;
393 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1;
394 phy_reg = mdiobus_read(bus, addr, reg_addr);
397 *devices_in_package |= (phy_reg & 0xffff);
403 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
404 * @bus: the target MII bus
405 * @addr: PHY address on the MII bus
406 * @phy_id: where to store the ID retrieved.
407 * @c45_ids: where to store the c45 ID information.
409 * If the PHY devices-in-package appears to be valid, it and the
410 * corresponding identifiers are stored in @c45_ids, zero is stored
411 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns
415 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
416 struct phy_c45_device_ids *c45_ids) {
419 const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
420 u32 *devs = &c45_ids->devices_in_package;
422 /* Find first non-zero Devices In package. Device zero is reserved
423 * for 802.3 c45 complied PHYs, so don't probe it at first.
425 for (i = 1; i < num_ids && *devs == 0; i++) {
426 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs);
430 if ((*devs & 0x1fffffff) == 0x1fffffff) {
431 /* If mostly Fs, there is no device there,
432 * then let's continue to probe more, as some
433 * 10G PHYs have zero Devices In package,
434 * e.g. Cortina CS4315/CS4340 PHY.
436 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs);
439 /* no device there, let's get out of here */
440 if ((*devs & 0x1fffffff) == 0x1fffffff) {
441 *phy_id = 0xffffffff;
449 /* Now probe Device Identifiers for each device present. */
450 for (i = 1; i < num_ids; i++) {
451 if (!(c45_ids->devices_in_package & (1 << i)))
454 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1;
455 phy_reg = mdiobus_read(bus, addr, reg_addr);
458 c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16;
460 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2;
461 phy_reg = mdiobus_read(bus, addr, reg_addr);
464 c45_ids->device_ids[i] |= (phy_reg & 0xffff);
471 * get_phy_id - reads the specified addr for its ID.
472 * @bus: the target MII bus
473 * @addr: PHY address on the MII bus
474 * @phy_id: where to store the ID retrieved.
475 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
476 * @c45_ids: where to store the c45 ID information.
478 * Description: In the case of a 802.3-c22 PHY, reads the ID registers
479 * of the PHY at @addr on the @bus, stores it in @phy_id and returns
482 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
483 * its return value is in turn returned.
486 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
487 bool is_c45, struct phy_c45_device_ids *c45_ids)
492 return get_phy_c45_ids(bus, addr, phy_id, c45_ids);
494 /* Grab the bits from PHYIR1, and put them in the upper half */
495 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
499 *phy_id = (phy_reg & 0xffff) << 16;
501 /* Grab the bits from PHYIR2, and put them in the lower half */
502 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
506 *phy_id |= (phy_reg & 0xffff);
512 * get_phy_device - reads the specified PHY device and returns its @phy_device
514 * @bus: the target MII bus
515 * @addr: PHY address on the MII bus
516 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
518 * Description: Reads the ID registers of the PHY at @addr on the
519 * @bus, then allocates and returns the phy_device to represent it.
521 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
523 struct phy_c45_device_ids c45_ids = {0};
527 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids);
531 /* If the phy_id is mostly Fs, there is no device there */
532 if ((phy_id & 0x1fffffff) == 0x1fffffff)
533 return ERR_PTR(-ENODEV);
535 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
537 EXPORT_SYMBOL(get_phy_device);
540 phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
542 struct phy_device *phydev = to_phy_device(dev);
544 return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
546 static DEVICE_ATTR_RO(phy_id);
549 phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
551 struct phy_device *phydev = to_phy_device(dev);
552 const char *mode = NULL;
554 if (phy_is_internal(phydev))
557 mode = phy_modes(phydev->interface);
559 return sprintf(buf, "%s\n", mode);
561 static DEVICE_ATTR_RO(phy_interface);
564 phy_has_fixups_show(struct device *dev, struct device_attribute *attr,
567 struct phy_device *phydev = to_phy_device(dev);
569 return sprintf(buf, "%d\n", phydev->has_fixups);
571 static DEVICE_ATTR_RO(phy_has_fixups);
573 static struct attribute *phy_dev_attrs[] = {
574 &dev_attr_phy_id.attr,
575 &dev_attr_phy_interface.attr,
576 &dev_attr_phy_has_fixups.attr,
579 ATTRIBUTE_GROUPS(phy_dev);
582 * phy_device_register - Register the phy device on the MDIO bus
583 * @phydev: phy_device structure to be added to the MDIO bus
585 int phy_device_register(struct phy_device *phydev)
589 err = mdiobus_register_device(&phydev->mdio);
593 /* Run all of the fixups for this PHY */
594 err = phy_scan_fixups(phydev);
596 pr_err("PHY %d failed to initialize\n", phydev->mdio.addr);
600 phydev->mdio.dev.groups = phy_dev_groups;
602 err = device_add(&phydev->mdio.dev);
604 pr_err("PHY %d failed to add\n", phydev->mdio.addr);
611 mdiobus_unregister_device(&phydev->mdio);
614 EXPORT_SYMBOL(phy_device_register);
617 * phy_device_remove - Remove a previously registered phy device from the MDIO bus
618 * @phydev: phy_device structure to remove
620 * This doesn't free the phy_device itself, it merely reverses the effects
621 * of phy_device_register(). Use phy_device_free() to free the device
622 * after calling this function.
624 void phy_device_remove(struct phy_device *phydev)
626 device_del(&phydev->mdio.dev);
627 mdiobus_unregister_device(&phydev->mdio);
629 EXPORT_SYMBOL(phy_device_remove);
632 * phy_find_first - finds the first PHY device on the bus
633 * @bus: the target MII bus
635 struct phy_device *phy_find_first(struct mii_bus *bus)
637 struct phy_device *phydev;
640 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
641 phydev = mdiobus_get_phy(bus, addr);
647 EXPORT_SYMBOL(phy_find_first);
650 * phy_prepare_link - prepares the PHY layer to monitor link status
651 * @phydev: target phy_device struct
652 * @handler: callback function for link status change notifications
654 * Description: Tells the PHY infrastructure to handle the
655 * gory details on monitoring link status (whether through
656 * polling or an interrupt), and to call back to the
657 * connected device driver when the link status changes.
658 * If you want to monitor your own link state, don't call
661 static void phy_prepare_link(struct phy_device *phydev,
662 void (*handler)(struct net_device *))
664 phydev->adjust_link = handler;
668 * phy_connect_direct - connect an ethernet device to a specific phy_device
669 * @dev: the network device to connect
670 * @phydev: the pointer to the phy device
671 * @handler: callback function for state change notifications
672 * @interface: PHY device's interface
674 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
675 void (*handler)(struct net_device *),
676 phy_interface_t interface)
680 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
684 phy_prepare_link(phydev, handler);
685 phy_start_machine(phydev);
687 phy_start_interrupts(phydev);
691 EXPORT_SYMBOL(phy_connect_direct);
694 * phy_connect - connect an ethernet device to a PHY device
695 * @dev: the network device to connect
696 * @bus_id: the id string of the PHY device to connect
697 * @handler: callback function for state change notifications
698 * @interface: PHY device's interface
700 * Description: Convenience function for connecting ethernet
701 * devices to PHY devices. The default behavior is for
702 * the PHY infrastructure to handle everything, and only notify
703 * the connected driver when the link status changes. If you
704 * don't want, or can't use the provided functionality, you may
705 * choose to call only the subset of functions which provide
706 * the desired functionality.
708 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
709 void (*handler)(struct net_device *),
710 phy_interface_t interface)
712 struct phy_device *phydev;
716 /* Search the list of PHY devices on the mdio bus for the
717 * PHY with the requested name
719 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
721 pr_err("PHY %s not found\n", bus_id);
722 return ERR_PTR(-ENODEV);
724 phydev = to_phy_device(d);
726 rc = phy_connect_direct(dev, phydev, handler, interface);
733 EXPORT_SYMBOL(phy_connect);
736 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
738 * @phydev: target phy_device struct
740 void phy_disconnect(struct phy_device *phydev)
743 phy_stop_interrupts(phydev);
745 phy_stop_machine(phydev);
747 phydev->adjust_link = NULL;
751 EXPORT_SYMBOL(phy_disconnect);
754 * phy_poll_reset - Safely wait until a PHY reset has properly completed
755 * @phydev: The PHY device to poll
757 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
758 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR
759 * register must be polled until the BMCR_RESET bit clears.
761 * Furthermore, any attempts to write to PHY registers may have no effect
762 * or even generate MDIO bus errors until this is complete.
764 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
765 * standard and do not fully reset after the BMCR_RESET bit is set, and may
766 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an
767 * effort to support such broken PHYs, this function is separate from the
768 * standard phy_init_hw() which will zero all the other bits in the BMCR
769 * and reapply all driver-specific and board-specific fixups.
771 static int phy_poll_reset(struct phy_device *phydev)
773 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
774 unsigned int retries = 12;
779 ret = phy_read(phydev, MII_BMCR);
782 } while (ret & BMCR_RESET && --retries);
783 if (ret & BMCR_RESET)
786 /* Some chips (smsc911x) may still need up to another 1ms after the
787 * BMCR_RESET bit is cleared before they are usable.
793 int phy_init_hw(struct phy_device *phydev)
797 if (!phydev->drv || !phydev->drv->config_init)
800 if (phydev->drv->soft_reset)
801 ret = phydev->drv->soft_reset(phydev);
803 ret = genphy_soft_reset(phydev);
808 ret = phy_scan_fixups(phydev);
812 return phydev->drv->config_init(phydev);
814 EXPORT_SYMBOL(phy_init_hw);
816 void phy_attached_info(struct phy_device *phydev)
818 phy_attached_print(phydev, NULL);
820 EXPORT_SYMBOL(phy_attached_info);
822 #define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)"
823 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
826 dev_info(&phydev->mdio.dev, ATTACHED_FMT "\n",
827 phydev->drv->name, phydev_name(phydev),
832 dev_info(&phydev->mdio.dev, ATTACHED_FMT,
833 phydev->drv->name, phydev_name(phydev),
841 EXPORT_SYMBOL(phy_attached_print);
844 * phy_attach_direct - attach a network device to a given PHY device pointer
845 * @dev: network device to attach
846 * @phydev: Pointer to phy_device to attach
847 * @flags: PHY device's dev_flags
848 * @interface: PHY device's interface
850 * Description: Called by drivers to attach to a particular PHY
851 * device. The phy_device is found, and properly hooked up
852 * to the phy_driver. If no driver is attached, then a
853 * generic driver is used. The phy_device is given a ptr to
854 * the attaching device, and given a callback for link status
855 * change. The phy_device is returned to the attaching driver.
856 * This function takes a reference on the phy device.
858 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
859 u32 flags, phy_interface_t interface)
861 struct mii_bus *bus = phydev->mdio.bus;
862 struct device *d = &phydev->mdio.dev;
865 if (!try_module_get(bus->owner)) {
866 dev_err(&dev->dev, "failed to get the bus module\n");
872 /* Assume that if there is no driver, that it doesn't
873 * exist, and we should use the genphy driver.
878 &genphy_driver[GENPHY_DRV_10G].mdiodrv.driver;
881 &genphy_driver[GENPHY_DRV_1G].mdiodrv.driver;
883 err = d->driver->probe(d);
885 err = device_bind_driver(d);
891 if (phydev->attached_dev) {
892 dev_err(&dev->dev, "PHY already attached\n");
897 phydev->attached_dev = dev;
898 dev->phydev = phydev;
900 phydev->dev_flags = flags;
902 phydev->interface = interface;
904 phydev->state = PHY_READY;
906 /* Initial carrier state is off as the phy is about to be
909 netif_carrier_off(phydev->attached_dev);
911 /* Do initial configuration here, now that
912 * we have certain key parameters
913 * (dev_flags and interface)
915 err = phy_init_hw(phydev);
921 phy_led_triggers_register(phydev);
927 module_put(bus->owner);
930 EXPORT_SYMBOL(phy_attach_direct);
933 * phy_attach - attach a network device to a particular PHY device
934 * @dev: network device to attach
935 * @bus_id: Bus ID of PHY device to attach
936 * @interface: PHY device's interface
938 * Description: Same as phy_attach_direct() except that a PHY bus_id
939 * string is passed instead of a pointer to a struct phy_device.
941 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
942 phy_interface_t interface)
944 struct bus_type *bus = &mdio_bus_type;
945 struct phy_device *phydev;
949 /* Search the list of PHY devices on the mdio bus for the
950 * PHY with the requested name
952 d = bus_find_device_by_name(bus, NULL, bus_id);
954 pr_err("PHY %s not found\n", bus_id);
955 return ERR_PTR(-ENODEV);
957 phydev = to_phy_device(d);
959 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
966 EXPORT_SYMBOL(phy_attach);
969 * phy_detach - detach a PHY device from its network device
970 * @phydev: target phy_device struct
972 * This detaches the phy device from its network device and the phy
973 * driver, and drops the reference count taken in phy_attach_direct().
975 void phy_detach(struct phy_device *phydev)
980 phydev->attached_dev->phydev = NULL;
981 phydev->attached_dev = NULL;
984 /* If the device had no specific driver before (i.e. - it
985 * was using the generic driver), we unbind the device
986 * from the generic driver so that there's a chance a
987 * real driver could be loaded
989 for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) {
990 if (phydev->mdio.dev.driver ==
991 &genphy_driver[i].mdiodrv.driver) {
992 device_release_driver(&phydev->mdio.dev);
997 phy_led_triggers_unregister(phydev);
1000 * The phydev might go away on the put_device() below, so avoid
1001 * a use-after-free bug by reading the underlying bus first.
1003 bus = phydev->mdio.bus;
1005 put_device(&phydev->mdio.dev);
1006 module_put(bus->owner);
1008 EXPORT_SYMBOL(phy_detach);
1010 int phy_suspend(struct phy_device *phydev)
1012 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
1013 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
1016 /* If the device has WOL enabled, we cannot suspend the PHY */
1017 phy_ethtool_get_wol(phydev, &wol);
1021 if (phydrv->suspend)
1022 ret = phydrv->suspend(phydev);
1027 phydev->suspended = true;
1031 EXPORT_SYMBOL(phy_suspend);
1033 int phy_resume(struct phy_device *phydev)
1035 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
1039 ret = phydrv->resume(phydev);
1044 phydev->suspended = false;
1048 EXPORT_SYMBOL(phy_resume);
1050 /* Generic PHY support and helper functions */
1053 * genphy_config_advert - sanitize and advertise auto-negotiation parameters
1054 * @phydev: target phy_device struct
1056 * Description: Writes MII_ADVERTISE with the appropriate values,
1057 * after sanitizing the values to make sure we only advertise
1058 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
1059 * hasn't changed, and > 0 if it has changed.
1061 static int genphy_config_advert(struct phy_device *phydev)
1064 int oldadv, adv, bmsr;
1065 int err, changed = 0;
1067 /* Only allow advertising what this PHY supports */
1068 phydev->advertising &= phydev->supported;
1069 advertise = phydev->advertising;
1071 /* Setup standard advertisement */
1072 adv = phy_read(phydev, MII_ADVERTISE);
1077 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
1078 ADVERTISE_PAUSE_ASYM);
1079 adv |= ethtool_adv_to_mii_adv_t(advertise);
1081 if (adv != oldadv) {
1082 err = phy_write(phydev, MII_ADVERTISE, adv);
1089 bmsr = phy_read(phydev, MII_BMSR);
1093 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
1094 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
1097 if (!(bmsr & BMSR_ESTATEN))
1100 /* Configure gigabit if it's supported */
1101 adv = phy_read(phydev, MII_CTRL1000);
1106 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
1108 if (phydev->supported & (SUPPORTED_1000baseT_Half |
1109 SUPPORTED_1000baseT_Full)) {
1110 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
1116 err = phy_write(phydev, MII_CTRL1000, adv);
1124 * genphy_setup_forced - configures/forces speed/duplex from @phydev
1125 * @phydev: target phy_device struct
1127 * Description: Configures MII_BMCR to force speed/duplex
1128 * to the values in phydev. Assumes that the values are valid.
1129 * Please see phy_sanitize_settings().
1131 int genphy_setup_forced(struct phy_device *phydev)
1133 int ctl = phy_read(phydev, MII_BMCR);
1135 ctl &= BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN;
1137 phydev->asym_pause = 0;
1139 if (SPEED_1000 == phydev->speed)
1140 ctl |= BMCR_SPEED1000;
1141 else if (SPEED_100 == phydev->speed)
1142 ctl |= BMCR_SPEED100;
1144 if (DUPLEX_FULL == phydev->duplex)
1145 ctl |= BMCR_FULLDPLX;
1147 return phy_write(phydev, MII_BMCR, ctl);
1149 EXPORT_SYMBOL(genphy_setup_forced);
1152 * genphy_restart_aneg - Enable and Restart Autonegotiation
1153 * @phydev: target phy_device struct
1155 int genphy_restart_aneg(struct phy_device *phydev)
1157 int ctl = phy_read(phydev, MII_BMCR);
1162 ctl |= BMCR_ANENABLE | BMCR_ANRESTART;
1164 /* Don't isolate the PHY if we're negotiating */
1165 ctl &= ~BMCR_ISOLATE;
1167 return phy_write(phydev, MII_BMCR, ctl);
1169 EXPORT_SYMBOL(genphy_restart_aneg);
1172 * genphy_config_aneg - restart auto-negotiation or write BMCR
1173 * @phydev: target phy_device struct
1175 * Description: If auto-negotiation is enabled, we configure the
1176 * advertising, and then restart auto-negotiation. If it is not
1177 * enabled, then we write the BMCR.
1179 int genphy_config_aneg(struct phy_device *phydev)
1183 if (AUTONEG_ENABLE != phydev->autoneg)
1184 return genphy_setup_forced(phydev);
1186 result = genphy_config_advert(phydev);
1187 if (result < 0) /* error */
1190 /* Advertisement hasn't changed, but maybe aneg was never on to
1191 * begin with? Or maybe phy was isolated?
1193 int ctl = phy_read(phydev, MII_BMCR);
1198 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
1199 result = 1; /* do restart aneg */
1202 /* Only restart aneg if we are advertising something different
1203 * than we were before.
1206 result = genphy_restart_aneg(phydev);
1210 EXPORT_SYMBOL(genphy_config_aneg);
1213 * genphy_aneg_done - return auto-negotiation status
1214 * @phydev: target phy_device struct
1216 * Description: Reads the status register and returns 0 either if
1217 * auto-negotiation is incomplete, or if there was an error.
1218 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
1220 int genphy_aneg_done(struct phy_device *phydev)
1222 int retval = phy_read(phydev, MII_BMSR);
1224 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1226 EXPORT_SYMBOL(genphy_aneg_done);
1228 static int gen10g_config_aneg(struct phy_device *phydev)
1234 * genphy_update_link - update link status in @phydev
1235 * @phydev: target phy_device struct
1237 * Description: Update the value in phydev->link to reflect the
1238 * current link value. In order to do this, we need to read
1239 * the status register twice, keeping the second value.
1241 int genphy_update_link(struct phy_device *phydev)
1245 /* Do a fake read */
1246 status = phy_read(phydev, MII_BMSR);
1250 /* Read link and autonegotiation status */
1251 status = phy_read(phydev, MII_BMSR);
1255 if ((status & BMSR_LSTATUS) == 0)
1262 EXPORT_SYMBOL(genphy_update_link);
1265 * genphy_read_status - check the link status and update current link state
1266 * @phydev: target phy_device struct
1268 * Description: Check the link, then figure out the current state
1269 * by comparing what we advertise with what the link partner
1270 * advertises. Start by checking the gigabit possibilities,
1271 * then move on to 10/100.
1273 int genphy_read_status(struct phy_device *phydev)
1280 int common_adv_gb = 0;
1282 /* Update the link, but return if there was an error */
1283 err = genphy_update_link(phydev);
1287 phydev->lp_advertising = 0;
1289 if (AUTONEG_ENABLE == phydev->autoneg) {
1290 if (phydev->supported & (SUPPORTED_1000baseT_Half
1291 | SUPPORTED_1000baseT_Full)) {
1292 lpagb = phy_read(phydev, MII_STAT1000);
1296 adv = phy_read(phydev, MII_CTRL1000);
1300 phydev->lp_advertising =
1301 mii_stat1000_to_ethtool_lpa_t(lpagb);
1302 common_adv_gb = lpagb & adv << 2;
1305 lpa = phy_read(phydev, MII_LPA);
1309 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa);
1311 adv = phy_read(phydev, MII_ADVERTISE);
1315 common_adv = lpa & adv;
1317 phydev->speed = SPEED_10;
1318 phydev->duplex = DUPLEX_HALF;
1320 phydev->asym_pause = 0;
1322 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) {
1323 phydev->speed = SPEED_1000;
1325 if (common_adv_gb & LPA_1000FULL)
1326 phydev->duplex = DUPLEX_FULL;
1327 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) {
1328 phydev->speed = SPEED_100;
1330 if (common_adv & LPA_100FULL)
1331 phydev->duplex = DUPLEX_FULL;
1333 if (common_adv & LPA_10FULL)
1334 phydev->duplex = DUPLEX_FULL;
1336 if (phydev->duplex == DUPLEX_FULL) {
1337 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
1338 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
1341 int bmcr = phy_read(phydev, MII_BMCR);
1346 if (bmcr & BMCR_FULLDPLX)
1347 phydev->duplex = DUPLEX_FULL;
1349 phydev->duplex = DUPLEX_HALF;
1351 if (bmcr & BMCR_SPEED1000)
1352 phydev->speed = SPEED_1000;
1353 else if (bmcr & BMCR_SPEED100)
1354 phydev->speed = SPEED_100;
1356 phydev->speed = SPEED_10;
1359 phydev->asym_pause = 0;
1364 EXPORT_SYMBOL(genphy_read_status);
1366 static int gen10g_read_status(struct phy_device *phydev)
1369 u32 mmd_mask = phydev->c45_ids.devices_in_package;
1373 /* For now just lie and say it's 10G all the time */
1374 phydev->speed = SPEED_10000;
1375 phydev->duplex = DUPLEX_FULL;
1377 for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) {
1378 if (!(mmd_mask & 1))
1381 /* Read twice because link state is latched and a
1382 * read moves the current state into the register
1384 phy_read_mmd(phydev, devad, MDIO_STAT1);
1385 reg = phy_read_mmd(phydev, devad, MDIO_STAT1);
1386 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
1394 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
1395 * @phydev: target phy_device struct
1397 * Description: Perform a software PHY reset using the standard
1398 * BMCR_RESET bit and poll for the reset bit to be cleared.
1400 * Returns: 0 on success, < 0 on failure
1402 int genphy_soft_reset(struct phy_device *phydev)
1406 ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
1410 return phy_poll_reset(phydev);
1412 EXPORT_SYMBOL(genphy_soft_reset);
1414 int genphy_config_init(struct phy_device *phydev)
1419 features = (SUPPORTED_TP | SUPPORTED_MII
1420 | SUPPORTED_AUI | SUPPORTED_FIBRE |
1421 SUPPORTED_BNC | SUPPORTED_Pause | SUPPORTED_Asym_Pause);
1423 /* Do we support autonegotiation? */
1424 val = phy_read(phydev, MII_BMSR);
1428 if (val & BMSR_ANEGCAPABLE)
1429 features |= SUPPORTED_Autoneg;
1431 if (val & BMSR_100FULL)
1432 features |= SUPPORTED_100baseT_Full;
1433 if (val & BMSR_100HALF)
1434 features |= SUPPORTED_100baseT_Half;
1435 if (val & BMSR_10FULL)
1436 features |= SUPPORTED_10baseT_Full;
1437 if (val & BMSR_10HALF)
1438 features |= SUPPORTED_10baseT_Half;
1440 if (val & BMSR_ESTATEN) {
1441 val = phy_read(phydev, MII_ESTATUS);
1445 if (val & ESTATUS_1000_TFULL)
1446 features |= SUPPORTED_1000baseT_Full;
1447 if (val & ESTATUS_1000_THALF)
1448 features |= SUPPORTED_1000baseT_Half;
1451 phydev->supported &= features;
1452 phydev->advertising &= features;
1457 static int gen10g_soft_reset(struct phy_device *phydev)
1459 /* Do nothing for now */
1462 EXPORT_SYMBOL(genphy_config_init);
1464 static int gen10g_config_init(struct phy_device *phydev)
1466 /* Temporarily just say we support everything */
1467 phydev->supported = SUPPORTED_10000baseT_Full;
1468 phydev->advertising = SUPPORTED_10000baseT_Full;
1473 int genphy_suspend(struct phy_device *phydev)
1477 mutex_lock(&phydev->lock);
1479 value = phy_read(phydev, MII_BMCR);
1480 phy_write(phydev, MII_BMCR, value | BMCR_PDOWN);
1482 mutex_unlock(&phydev->lock);
1486 EXPORT_SYMBOL(genphy_suspend);
1488 static int gen10g_suspend(struct phy_device *phydev)
1493 int genphy_resume(struct phy_device *phydev)
1497 mutex_lock(&phydev->lock);
1499 value = phy_read(phydev, MII_BMCR);
1500 phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN);
1502 mutex_unlock(&phydev->lock);
1506 EXPORT_SYMBOL(genphy_resume);
1508 static int gen10g_resume(struct phy_device *phydev)
1513 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
1515 /* The default values for phydev->supported are provided by the PHY
1516 * driver "features" member, we want to reset to sane defaults first
1517 * before supporting higher speeds.
1519 phydev->supported &= PHY_DEFAULT_FEATURES;
1521 switch (max_speed) {
1525 phydev->supported |= PHY_1000BT_FEATURES;
1528 phydev->supported |= PHY_100BT_FEATURES;
1531 phydev->supported |= PHY_10BT_FEATURES;
1537 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed)
1541 err = __set_phy_supported(phydev, max_speed);
1545 phydev->advertising = phydev->supported;
1549 EXPORT_SYMBOL(phy_set_max_speed);
1551 static void of_set_phy_supported(struct phy_device *phydev)
1553 struct device_node *node = phydev->mdio.dev.of_node;
1556 if (!IS_ENABLED(CONFIG_OF_MDIO))
1562 if (!of_property_read_u32(node, "max-speed", &max_speed))
1563 __set_phy_supported(phydev, max_speed);
1567 * phy_probe - probe and init a PHY device
1568 * @dev: device to probe and init
1570 * Description: Take care of setting up the phy_device structure,
1571 * set the state to READY (the driver's init function should
1572 * set it to STARTING if needed).
1574 static int phy_probe(struct device *dev)
1576 struct phy_device *phydev = to_phy_device(dev);
1577 struct device_driver *drv = phydev->mdio.dev.driver;
1578 struct phy_driver *phydrv = to_phy_driver(drv);
1581 phydev->drv = phydrv;
1583 /* Disable the interrupt if the PHY doesn't support it
1584 * but the interrupt is still a valid one
1586 if (!(phydrv->flags & PHY_HAS_INTERRUPT) &&
1587 phy_interrupt_is_valid(phydev))
1588 phydev->irq = PHY_POLL;
1590 if (phydrv->flags & PHY_IS_INTERNAL)
1591 phydev->is_internal = true;
1593 mutex_lock(&phydev->lock);
1595 /* Start out supporting everything. Eventually,
1596 * a controller will attach, and may modify one
1597 * or both of these values
1599 phydev->supported = phydrv->features;
1600 of_set_phy_supported(phydev);
1601 phydev->advertising = phydev->supported;
1603 /* Set the state to READY by default */
1604 phydev->state = PHY_READY;
1606 if (phydev->drv->probe)
1607 err = phydev->drv->probe(phydev);
1609 mutex_unlock(&phydev->lock);
1614 static int phy_remove(struct device *dev)
1616 struct phy_device *phydev = to_phy_device(dev);
1618 mutex_lock(&phydev->lock);
1619 phydev->state = PHY_DOWN;
1620 mutex_unlock(&phydev->lock);
1622 if (phydev->drv->remove)
1623 phydev->drv->remove(phydev);
1630 * phy_driver_register - register a phy_driver with the PHY layer
1631 * @new_driver: new phy_driver to register
1632 * @owner: module owning this PHY
1634 int phy_driver_register(struct phy_driver *new_driver, struct module *owner)
1638 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY;
1639 new_driver->mdiodrv.driver.name = new_driver->name;
1640 new_driver->mdiodrv.driver.bus = &mdio_bus_type;
1641 new_driver->mdiodrv.driver.probe = phy_probe;
1642 new_driver->mdiodrv.driver.remove = phy_remove;
1643 new_driver->mdiodrv.driver.owner = owner;
1645 retval = driver_register(&new_driver->mdiodrv.driver);
1647 pr_err("%s: Error %d in registering driver\n",
1648 new_driver->name, retval);
1653 pr_debug("%s: Registered new driver\n", new_driver->name);
1657 EXPORT_SYMBOL(phy_driver_register);
1659 int phy_drivers_register(struct phy_driver *new_driver, int n,
1660 struct module *owner)
1664 for (i = 0; i < n; i++) {
1665 ret = phy_driver_register(new_driver + i, owner);
1668 phy_driver_unregister(new_driver + i);
1674 EXPORT_SYMBOL(phy_drivers_register);
1676 void phy_driver_unregister(struct phy_driver *drv)
1678 driver_unregister(&drv->mdiodrv.driver);
1680 EXPORT_SYMBOL(phy_driver_unregister);
1682 void phy_drivers_unregister(struct phy_driver *drv, int n)
1686 for (i = 0; i < n; i++)
1687 phy_driver_unregister(drv + i);
1689 EXPORT_SYMBOL(phy_drivers_unregister);
1691 static struct phy_driver genphy_driver[] = {
1693 .phy_id = 0xffffffff,
1694 .phy_id_mask = 0xffffffff,
1695 .name = "Generic PHY",
1696 .soft_reset = genphy_soft_reset,
1697 .config_init = genphy_config_init,
1698 .features = PHY_GBIT_FEATURES | SUPPORTED_MII |
1699 SUPPORTED_AUI | SUPPORTED_FIBRE |
1701 .config_aneg = genphy_config_aneg,
1702 .aneg_done = genphy_aneg_done,
1703 .read_status = genphy_read_status,
1704 .suspend = genphy_suspend,
1705 .resume = genphy_resume,
1707 .phy_id = 0xffffffff,
1708 .phy_id_mask = 0xffffffff,
1709 .name = "Generic 10G PHY",
1710 .soft_reset = gen10g_soft_reset,
1711 .config_init = gen10g_config_init,
1713 .config_aneg = gen10g_config_aneg,
1714 .read_status = gen10g_read_status,
1715 .suspend = gen10g_suspend,
1716 .resume = gen10g_resume,
1719 static int __init phy_init(void)
1723 rc = mdio_bus_init();
1727 rc = phy_drivers_register(genphy_driver,
1728 ARRAY_SIZE(genphy_driver), THIS_MODULE);
1735 static void __exit phy_exit(void)
1737 phy_drivers_unregister(genphy_driver,
1738 ARRAY_SIZE(genphy_driver));
1742 subsys_initcall(phy_init);
1743 module_exit(phy_exit);