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/mdio.h>
35 #include <linux/uaccess.h>
39 MODULE_DESCRIPTION("PHY library");
40 MODULE_AUTHOR("Andy Fleming");
41 MODULE_LICENSE("GPL");
43 void phy_device_free(struct phy_device *phydev)
45 put_device(&phydev->dev);
47 EXPORT_SYMBOL(phy_device_free);
49 static void phy_device_release(struct device *dev)
51 kfree(to_phy_device(dev));
60 static struct phy_driver genphy_driver[GENPHY_DRV_MAX];
62 static LIST_HEAD(phy_fixup_list);
63 static DEFINE_MUTEX(phy_fixup_lock);
66 * phy_register_fixup - creates a new phy_fixup and adds it to the list
67 * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID)
68 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
69 * It can also be PHY_ANY_UID
70 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
72 * @run: The actual code to be run when a matching PHY is found
74 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
75 int (*run)(struct phy_device *))
77 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
82 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
83 fixup->phy_uid = phy_uid;
84 fixup->phy_uid_mask = phy_uid_mask;
87 mutex_lock(&phy_fixup_lock);
88 list_add_tail(&fixup->list, &phy_fixup_list);
89 mutex_unlock(&phy_fixup_lock);
93 EXPORT_SYMBOL(phy_register_fixup);
95 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
96 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
97 int (*run)(struct phy_device *))
99 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
101 EXPORT_SYMBOL(phy_register_fixup_for_uid);
103 /* Registers a fixup to be run on the PHY with id string bus_id */
104 int phy_register_fixup_for_id(const char *bus_id,
105 int (*run)(struct phy_device *))
107 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
109 EXPORT_SYMBOL(phy_register_fixup_for_id);
111 /* Returns 1 if fixup matches phydev in bus_id and phy_uid.
112 * Fixups can be set to match any in one or more fields.
114 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
116 if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0)
117 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
120 if ((fixup->phy_uid & fixup->phy_uid_mask) !=
121 (phydev->phy_id & fixup->phy_uid_mask))
122 if (fixup->phy_uid != PHY_ANY_UID)
128 /* Runs any matching fixups for this phydev */
129 static int phy_scan_fixups(struct phy_device *phydev)
131 struct phy_fixup *fixup;
133 mutex_lock(&phy_fixup_lock);
134 list_for_each_entry(fixup, &phy_fixup_list, list) {
135 if (phy_needs_fixup(phydev, fixup)) {
136 int err = fixup->run(phydev);
139 mutex_unlock(&phy_fixup_lock);
144 mutex_unlock(&phy_fixup_lock);
149 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
151 struct phy_c45_device_ids *c45_ids)
153 struct phy_device *dev;
155 /* We allocate the device, and initialize the default values */
156 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
158 return (struct phy_device *)PTR_ERR((void *)-ENOMEM);
160 dev->dev.release = phy_device_release;
167 dev->interface = PHY_INTERFACE_MODE_GMII;
169 dev->autoneg = AUTONEG_ENABLE;
171 dev->is_c45 = is_c45;
173 dev->phy_id = phy_id;
175 dev->c45_ids = *c45_ids;
177 dev->dev.parent = bus->parent;
178 dev->dev.bus = &mdio_bus_type;
179 dev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
180 dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr);
182 dev->state = PHY_DOWN;
184 mutex_init(&dev->lock);
185 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
186 INIT_WORK(&dev->phy_queue, phy_change);
188 /* Request the appropriate module unconditionally; don't
189 * bother trying to do so only if it isn't already loaded,
190 * because that gets complicated. A hotplug event would have
191 * done an unconditional modprobe anyway.
192 * We don't do normal hotplug because it won't work for MDIO
193 * -- because it relies on the device staying around for long
194 * enough for the driver to get loaded. With MDIO, the NIC
195 * driver will get bored and give up as soon as it finds that
196 * there's no driver _already_ loaded.
198 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id));
200 device_initialize(&dev->dev);
204 EXPORT_SYMBOL(phy_device_create);
207 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
208 * @bus: the target MII bus
209 * @addr: PHY address on the MII bus
210 * @phy_id: where to store the ID retrieved.
211 * @c45_ids: where to store the c45 ID information.
213 * If the PHY devices-in-package appears to be valid, it and the
214 * corresponding identifiers are stored in @c45_ids, zero is stored
215 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns
219 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
220 struct phy_c45_device_ids *c45_ids) {
223 const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
225 /* Find first non-zero Devices In package. Device
226 * zero is reserved, so don't probe it.
229 i < num_ids && c45_ids->devices_in_package == 0;
231 reg_addr = MII_ADDR_C45 | i << 16 | 6;
232 phy_reg = mdiobus_read(bus, addr, reg_addr);
235 c45_ids->devices_in_package = (phy_reg & 0xffff) << 16;
237 reg_addr = MII_ADDR_C45 | i << 16 | 5;
238 phy_reg = mdiobus_read(bus, addr, reg_addr);
241 c45_ids->devices_in_package |= (phy_reg & 0xffff);
243 /* If mostly Fs, there is no device there,
244 * let's get out of here.
246 if ((c45_ids->devices_in_package & 0x1fffffff) == 0x1fffffff) {
247 *phy_id = 0xffffffff;
252 /* Now probe Device Identifiers for each device present. */
253 for (i = 1; i < num_ids; i++) {
254 if (!(c45_ids->devices_in_package & (1 << i)))
257 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1;
258 phy_reg = mdiobus_read(bus, addr, reg_addr);
261 c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16;
263 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2;
264 phy_reg = mdiobus_read(bus, addr, reg_addr);
267 c45_ids->device_ids[i] |= (phy_reg & 0xffff);
274 * get_phy_id - reads the specified addr for its ID.
275 * @bus: the target MII bus
276 * @addr: PHY address on the MII bus
277 * @phy_id: where to store the ID retrieved.
278 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
279 * @c45_ids: where to store the c45 ID information.
281 * Description: In the case of a 802.3-c22 PHY, reads the ID registers
282 * of the PHY at @addr on the @bus, stores it in @phy_id and returns
285 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
286 * its return value is in turn returned.
289 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
290 bool is_c45, struct phy_c45_device_ids *c45_ids)
295 return get_phy_c45_ids(bus, addr, phy_id, c45_ids);
297 /* Grab the bits from PHYIR1, and put them in the upper half */
298 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
302 *phy_id = (phy_reg & 0xffff) << 16;
304 /* Grab the bits from PHYIR2, and put them in the lower half */
305 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
309 *phy_id |= (phy_reg & 0xffff);
315 * get_phy_device - reads the specified PHY device and returns its @phy_device
317 * @bus: the target MII bus
318 * @addr: PHY address on the MII bus
319 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
321 * Description: Reads the ID registers of the PHY at @addr on the
322 * @bus, then allocates and returns the phy_device to represent it.
324 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
326 struct phy_c45_device_ids c45_ids = {0};
330 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids);
334 /* If the phy_id is mostly Fs, there is no device there */
335 if ((phy_id & 0x1fffffff) == 0x1fffffff)
338 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
340 EXPORT_SYMBOL(get_phy_device);
343 * phy_device_register - Register the phy device on the MDIO bus
344 * @phydev: phy_device structure to be added to the MDIO bus
346 int phy_device_register(struct phy_device *phydev)
350 /* Don't register a phy if one is already registered at this address */
351 if (phydev->bus->phy_map[phydev->addr])
353 phydev->bus->phy_map[phydev->addr] = phydev;
355 /* Run all of the fixups for this PHY */
356 err = phy_init_hw(phydev);
358 pr_err("PHY %d failed to initialize\n", phydev->addr);
362 err = device_add(&phydev->dev);
364 pr_err("PHY %d failed to add\n", phydev->addr);
371 phydev->bus->phy_map[phydev->addr] = NULL;
374 EXPORT_SYMBOL(phy_device_register);
377 * phy_find_first - finds the first PHY device on the bus
378 * @bus: the target MII bus
380 struct phy_device *phy_find_first(struct mii_bus *bus)
384 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
385 if (bus->phy_map[addr])
386 return bus->phy_map[addr];
390 EXPORT_SYMBOL(phy_find_first);
393 * phy_prepare_link - prepares the PHY layer to monitor link status
394 * @phydev: target phy_device struct
395 * @handler: callback function for link status change notifications
397 * Description: Tells the PHY infrastructure to handle the
398 * gory details on monitoring link status (whether through
399 * polling or an interrupt), and to call back to the
400 * connected device driver when the link status changes.
401 * If you want to monitor your own link state, don't call
404 static void phy_prepare_link(struct phy_device *phydev,
405 void (*handler)(struct net_device *))
407 phydev->adjust_link = handler;
411 * phy_connect_direct - connect an ethernet device to a specific phy_device
412 * @dev: the network device to connect
413 * @phydev: the pointer to the phy device
414 * @handler: callback function for state change notifications
415 * @interface: PHY device's interface
417 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
418 void (*handler)(struct net_device *),
419 phy_interface_t interface)
423 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
427 phy_prepare_link(phydev, handler);
428 phy_start_machine(phydev);
430 phy_start_interrupts(phydev);
434 EXPORT_SYMBOL(phy_connect_direct);
437 * phy_connect - connect an ethernet device to a PHY device
438 * @dev: the network device to connect
439 * @bus_id: the id string of the PHY device to connect
440 * @handler: callback function for state change notifications
441 * @interface: PHY device's interface
443 * Description: Convenience function for connecting ethernet
444 * devices to PHY devices. The default behavior is for
445 * the PHY infrastructure to handle everything, and only notify
446 * the connected driver when the link status changes. If you
447 * don't want, or can't use the provided functionality, you may
448 * choose to call only the subset of functions which provide
449 * the desired functionality.
451 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
452 void (*handler)(struct net_device *),
453 phy_interface_t interface)
455 struct phy_device *phydev;
459 /* Search the list of PHY devices on the mdio bus for the
460 * PHY with the requested name
462 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
464 pr_err("PHY %s not found\n", bus_id);
465 return ERR_PTR(-ENODEV);
467 phydev = to_phy_device(d);
469 rc = phy_connect_direct(dev, phydev, handler, interface);
475 EXPORT_SYMBOL(phy_connect);
478 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
480 * @phydev: target phy_device struct
482 void phy_disconnect(struct phy_device *phydev)
485 phy_stop_interrupts(phydev);
487 phy_stop_machine(phydev);
489 phydev->adjust_link = NULL;
493 EXPORT_SYMBOL(phy_disconnect);
496 * phy_poll_reset - Safely wait until a PHY reset has properly completed
497 * @phydev: The PHY device to poll
499 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
500 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR
501 * register must be polled until the BMCR_RESET bit clears.
503 * Furthermore, any attempts to write to PHY registers may have no effect
504 * or even generate MDIO bus errors until this is complete.
506 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
507 * standard and do not fully reset after the BMCR_RESET bit is set, and may
508 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an
509 * effort to support such broken PHYs, this function is separate from the
510 * standard phy_init_hw() which will zero all the other bits in the BMCR
511 * and reapply all driver-specific and board-specific fixups.
513 static int phy_poll_reset(struct phy_device *phydev)
515 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
516 unsigned int retries = 12;
521 ret = phy_read(phydev, MII_BMCR);
524 } while (ret & BMCR_RESET && --retries);
525 if (ret & BMCR_RESET)
528 /* Some chips (smsc911x) may still need up to another 1ms after the
529 * BMCR_RESET bit is cleared before they are usable.
535 int phy_init_hw(struct phy_device *phydev)
539 if (!phydev->drv || !phydev->drv->config_init)
542 ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
546 ret = phy_poll_reset(phydev);
550 ret = phy_scan_fixups(phydev);
554 return phydev->drv->config_init(phydev);
556 EXPORT_SYMBOL(phy_init_hw);
559 * phy_attach_direct - attach a network device to a given PHY device pointer
560 * @dev: network device to attach
561 * @phydev: Pointer to phy_device to attach
562 * @flags: PHY device's dev_flags
563 * @interface: PHY device's interface
565 * Description: Called by drivers to attach to a particular PHY
566 * device. The phy_device is found, and properly hooked up
567 * to the phy_driver. If no driver is attached, then a
568 * generic driver is used. The phy_device is given a ptr to
569 * the attaching device, and given a callback for link status
570 * change. The phy_device is returned to the attaching driver.
572 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
573 u32 flags, phy_interface_t interface)
575 struct device *d = &phydev->dev;
578 /* Assume that if there is no driver, that it doesn't
579 * exist, and we should use the genphy driver.
581 if (NULL == d->driver) {
583 d->driver = &genphy_driver[GENPHY_DRV_10G].driver;
585 d->driver = &genphy_driver[GENPHY_DRV_1G].driver;
587 err = d->driver->probe(d);
589 err = device_bind_driver(d);
595 if (phydev->attached_dev) {
596 dev_err(&dev->dev, "PHY already attached\n");
600 phydev->attached_dev = dev;
601 dev->phydev = phydev;
603 phydev->dev_flags = flags;
605 phydev->interface = interface;
607 phydev->state = PHY_READY;
609 /* Do initial configuration here, now that
610 * we have certain key parameters
611 * (dev_flags and interface)
613 err = phy_init_hw(phydev);
621 EXPORT_SYMBOL(phy_attach_direct);
624 * phy_attach - attach a network device to a particular PHY device
625 * @dev: network device to attach
626 * @bus_id: Bus ID of PHY device to attach
627 * @interface: PHY device's interface
629 * Description: Same as phy_attach_direct() except that a PHY bus_id
630 * string is passed instead of a pointer to a struct phy_device.
632 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
633 phy_interface_t interface)
635 struct bus_type *bus = &mdio_bus_type;
636 struct phy_device *phydev;
640 /* Search the list of PHY devices on the mdio bus for the
641 * PHY with the requested name
643 d = bus_find_device_by_name(bus, NULL, bus_id);
645 pr_err("PHY %s not found\n", bus_id);
646 return ERR_PTR(-ENODEV);
648 phydev = to_phy_device(d);
650 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
656 EXPORT_SYMBOL(phy_attach);
659 * phy_detach - detach a PHY device from its network device
660 * @phydev: target phy_device struct
662 void phy_detach(struct phy_device *phydev)
665 phydev->attached_dev->phydev = NULL;
666 phydev->attached_dev = NULL;
669 /* If the device had no specific driver before (i.e. - it
670 * was using the generic driver), we unbind the device
671 * from the generic driver so that there's a chance a
672 * real driver could be loaded
674 for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) {
675 if (phydev->dev.driver == &genphy_driver[i].driver) {
676 device_release_driver(&phydev->dev);
681 EXPORT_SYMBOL(phy_detach);
683 int phy_suspend(struct phy_device *phydev)
685 struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
686 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
688 /* If the device has WOL enabled, we cannot suspend the PHY */
689 phy_ethtool_get_wol(phydev, &wol);
694 return phydrv->suspend(phydev);
698 int phy_resume(struct phy_device *phydev)
700 struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
703 return phydrv->resume(phydev);
707 /* Generic PHY support and helper functions */
710 * genphy_config_advert - sanitize and advertise auto-negotiation parameters
711 * @phydev: target phy_device struct
713 * Description: Writes MII_ADVERTISE with the appropriate values,
714 * after sanitizing the values to make sure we only advertise
715 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
716 * hasn't changed, and > 0 if it has changed.
718 static int genphy_config_advert(struct phy_device *phydev)
721 int oldadv, adv, bmsr;
722 int err, changed = 0;
724 /* Only allow advertising what this PHY supports */
725 phydev->advertising &= phydev->supported;
726 advertise = phydev->advertising;
728 /* Setup standard advertisement */
729 adv = phy_read(phydev, MII_ADVERTISE);
734 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
735 ADVERTISE_PAUSE_ASYM);
736 adv |= ethtool_adv_to_mii_adv_t(advertise);
739 err = phy_write(phydev, MII_ADVERTISE, adv);
746 bmsr = phy_read(phydev, MII_BMSR);
750 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
751 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
754 if (!(bmsr & BMSR_ESTATEN))
757 /* Configure gigabit if it's supported */
758 adv = phy_read(phydev, MII_CTRL1000);
763 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
765 if (phydev->supported & (SUPPORTED_1000baseT_Half |
766 SUPPORTED_1000baseT_Full)) {
767 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
772 err = phy_write(phydev, MII_CTRL1000, adv);
780 * genphy_setup_forced - configures/forces speed/duplex from @phydev
781 * @phydev: target phy_device struct
783 * Description: Configures MII_BMCR to force speed/duplex
784 * to the values in phydev. Assumes that the values are valid.
785 * Please see phy_sanitize_settings().
787 int genphy_setup_forced(struct phy_device *phydev)
792 phydev->asym_pause = 0;
794 if (SPEED_1000 == phydev->speed)
795 ctl |= BMCR_SPEED1000;
796 else if (SPEED_100 == phydev->speed)
797 ctl |= BMCR_SPEED100;
799 if (DUPLEX_FULL == phydev->duplex)
800 ctl |= BMCR_FULLDPLX;
802 return phy_write(phydev, MII_BMCR, ctl);
804 EXPORT_SYMBOL(genphy_setup_forced);
807 * genphy_restart_aneg - Enable and Restart Autonegotiation
808 * @phydev: target phy_device struct
810 int genphy_restart_aneg(struct phy_device *phydev)
812 int ctl = phy_read(phydev, MII_BMCR);
817 ctl |= BMCR_ANENABLE | BMCR_ANRESTART;
819 /* Don't isolate the PHY if we're negotiating */
820 ctl &= ~BMCR_ISOLATE;
822 return phy_write(phydev, MII_BMCR, ctl);
824 EXPORT_SYMBOL(genphy_restart_aneg);
827 * genphy_config_aneg - restart auto-negotiation or write BMCR
828 * @phydev: target phy_device struct
830 * Description: If auto-negotiation is enabled, we configure the
831 * advertising, and then restart auto-negotiation. If it is not
832 * enabled, then we write the BMCR.
834 int genphy_config_aneg(struct phy_device *phydev)
838 if (AUTONEG_ENABLE != phydev->autoneg)
839 return genphy_setup_forced(phydev);
841 result = genphy_config_advert(phydev);
842 if (result < 0) /* error */
845 /* Advertisement hasn't changed, but maybe aneg was never on to
846 * begin with? Or maybe phy was isolated?
848 int ctl = phy_read(phydev, MII_BMCR);
853 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
854 result = 1; /* do restart aneg */
857 /* Only restart aneg if we are advertising something different
858 * than we were before.
861 result = genphy_restart_aneg(phydev);
865 EXPORT_SYMBOL(genphy_config_aneg);
867 static int gen10g_config_aneg(struct phy_device *phydev)
873 * genphy_update_link - update link status in @phydev
874 * @phydev: target phy_device struct
876 * Description: Update the value in phydev->link to reflect the
877 * current link value. In order to do this, we need to read
878 * the status register twice, keeping the second value.
880 int genphy_update_link(struct phy_device *phydev)
885 status = phy_read(phydev, MII_BMSR);
889 /* Read link and autonegotiation status */
890 status = phy_read(phydev, MII_BMSR);
894 if ((status & BMSR_LSTATUS) == 0)
901 EXPORT_SYMBOL(genphy_update_link);
904 * genphy_read_status - check the link status and update current link state
905 * @phydev: target phy_device struct
907 * Description: Check the link, then figure out the current state
908 * by comparing what we advertise with what the link partner
909 * advertises. Start by checking the gigabit possibilities,
910 * then move on to 10/100.
912 int genphy_read_status(struct phy_device *phydev)
919 int common_adv_gb = 0;
921 /* Update the link, but return if there was an error */
922 err = genphy_update_link(phydev);
926 phydev->lp_advertising = 0;
928 if (AUTONEG_ENABLE == phydev->autoneg) {
929 if (phydev->supported & (SUPPORTED_1000baseT_Half
930 | SUPPORTED_1000baseT_Full)) {
931 lpagb = phy_read(phydev, MII_STAT1000);
935 adv = phy_read(phydev, MII_CTRL1000);
939 phydev->lp_advertising =
940 mii_stat1000_to_ethtool_lpa_t(lpagb);
941 common_adv_gb = lpagb & adv << 2;
944 lpa = phy_read(phydev, MII_LPA);
948 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa);
950 adv = phy_read(phydev, MII_ADVERTISE);
954 common_adv = lpa & adv;
956 phydev->speed = SPEED_10;
957 phydev->duplex = DUPLEX_HALF;
959 phydev->asym_pause = 0;
961 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) {
962 phydev->speed = SPEED_1000;
964 if (common_adv_gb & LPA_1000FULL)
965 phydev->duplex = DUPLEX_FULL;
966 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) {
967 phydev->speed = SPEED_100;
969 if (common_adv & LPA_100FULL)
970 phydev->duplex = DUPLEX_FULL;
972 if (common_adv & LPA_10FULL)
973 phydev->duplex = DUPLEX_FULL;
975 if (phydev->duplex == DUPLEX_FULL) {
976 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
977 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
980 int bmcr = phy_read(phydev, MII_BMCR);
985 if (bmcr & BMCR_FULLDPLX)
986 phydev->duplex = DUPLEX_FULL;
988 phydev->duplex = DUPLEX_HALF;
990 if (bmcr & BMCR_SPEED1000)
991 phydev->speed = SPEED_1000;
992 else if (bmcr & BMCR_SPEED100)
993 phydev->speed = SPEED_100;
995 phydev->speed = SPEED_10;
998 phydev->asym_pause = 0;
1003 EXPORT_SYMBOL(genphy_read_status);
1005 static int gen10g_read_status(struct phy_device *phydev)
1008 u32 mmd_mask = phydev->c45_ids.devices_in_package;
1012 /* For now just lie and say it's 10G all the time */
1013 phydev->speed = SPEED_10000;
1014 phydev->duplex = DUPLEX_FULL;
1016 for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) {
1017 if (!(mmd_mask & 1))
1020 /* Read twice because link state is latched and a
1021 * read moves the current state into the register
1023 phy_read_mmd(phydev, devad, MDIO_STAT1);
1024 reg = phy_read_mmd(phydev, devad, MDIO_STAT1);
1025 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
1032 static int genphy_config_init(struct phy_device *phydev)
1037 /* For now, I'll claim that the generic driver supports
1038 * all possible port types
1040 features = (SUPPORTED_TP | SUPPORTED_MII
1041 | SUPPORTED_AUI | SUPPORTED_FIBRE |
1044 /* Do we support autonegotiation? */
1045 val = phy_read(phydev, MII_BMSR);
1049 if (val & BMSR_ANEGCAPABLE)
1050 features |= SUPPORTED_Autoneg;
1052 if (val & BMSR_100FULL)
1053 features |= SUPPORTED_100baseT_Full;
1054 if (val & BMSR_100HALF)
1055 features |= SUPPORTED_100baseT_Half;
1056 if (val & BMSR_10FULL)
1057 features |= SUPPORTED_10baseT_Full;
1058 if (val & BMSR_10HALF)
1059 features |= SUPPORTED_10baseT_Half;
1061 if (val & BMSR_ESTATEN) {
1062 val = phy_read(phydev, MII_ESTATUS);
1066 if (val & ESTATUS_1000_TFULL)
1067 features |= SUPPORTED_1000baseT_Full;
1068 if (val & ESTATUS_1000_THALF)
1069 features |= SUPPORTED_1000baseT_Half;
1072 phydev->supported = features;
1073 phydev->advertising = features;
1078 static int gen10g_config_init(struct phy_device *phydev)
1080 /* Temporarily just say we support everything */
1081 phydev->supported = SUPPORTED_10000baseT_Full;
1082 phydev->advertising = SUPPORTED_10000baseT_Full;
1087 int genphy_suspend(struct phy_device *phydev)
1091 mutex_lock(&phydev->lock);
1093 value = phy_read(phydev, MII_BMCR);
1094 phy_write(phydev, MII_BMCR, value | BMCR_PDOWN);
1096 mutex_unlock(&phydev->lock);
1100 EXPORT_SYMBOL(genphy_suspend);
1102 static int gen10g_suspend(struct phy_device *phydev)
1107 int genphy_resume(struct phy_device *phydev)
1111 mutex_lock(&phydev->lock);
1113 value = phy_read(phydev, MII_BMCR);
1114 phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN);
1116 mutex_unlock(&phydev->lock);
1120 EXPORT_SYMBOL(genphy_resume);
1122 static int gen10g_resume(struct phy_device *phydev)
1128 * phy_probe - probe and init a PHY device
1129 * @dev: device to probe and init
1131 * Description: Take care of setting up the phy_device structure,
1132 * set the state to READY (the driver's init function should
1133 * set it to STARTING if needed).
1135 static int phy_probe(struct device *dev)
1137 struct phy_device *phydev = to_phy_device(dev);
1138 struct device_driver *drv = phydev->dev.driver;
1139 struct phy_driver *phydrv = to_phy_driver(drv);
1142 phydev->drv = phydrv;
1144 /* Disable the interrupt if the PHY doesn't support it
1145 * but the interrupt is still a valid one
1147 if (!(phydrv->flags & PHY_HAS_INTERRUPT) &&
1148 phy_interrupt_is_valid(phydev))
1149 phydev->irq = PHY_POLL;
1151 if (phydrv->flags & PHY_IS_INTERNAL)
1152 phydev->is_internal = true;
1154 mutex_lock(&phydev->lock);
1156 /* Start out supporting everything. Eventually,
1157 * a controller will attach, and may modify one
1158 * or both of these values
1160 phydev->supported = phydrv->features;
1161 phydev->advertising = phydrv->features;
1163 /* Set the state to READY by default */
1164 phydev->state = PHY_READY;
1166 if (phydev->drv->probe)
1167 err = phydev->drv->probe(phydev);
1169 mutex_unlock(&phydev->lock);
1174 static int phy_remove(struct device *dev)
1176 struct phy_device *phydev = to_phy_device(dev);
1178 mutex_lock(&phydev->lock);
1179 phydev->state = PHY_DOWN;
1180 mutex_unlock(&phydev->lock);
1182 if (phydev->drv->remove)
1183 phydev->drv->remove(phydev);
1190 * phy_driver_register - register a phy_driver with the PHY layer
1191 * @new_driver: new phy_driver to register
1193 int phy_driver_register(struct phy_driver *new_driver)
1197 new_driver->driver.name = new_driver->name;
1198 new_driver->driver.bus = &mdio_bus_type;
1199 new_driver->driver.probe = phy_probe;
1200 new_driver->driver.remove = phy_remove;
1202 retval = driver_register(&new_driver->driver);
1204 pr_err("%s: Error %d in registering driver\n",
1205 new_driver->name, retval);
1210 pr_debug("%s: Registered new driver\n", new_driver->name);
1214 EXPORT_SYMBOL(phy_driver_register);
1216 int phy_drivers_register(struct phy_driver *new_driver, int n)
1220 for (i = 0; i < n; i++) {
1221 ret = phy_driver_register(new_driver + i);
1224 phy_driver_unregister(new_driver + i);
1230 EXPORT_SYMBOL(phy_drivers_register);
1232 void phy_driver_unregister(struct phy_driver *drv)
1234 driver_unregister(&drv->driver);
1236 EXPORT_SYMBOL(phy_driver_unregister);
1238 void phy_drivers_unregister(struct phy_driver *drv, int n)
1242 for (i = 0; i < n; i++)
1243 phy_driver_unregister(drv + i);
1245 EXPORT_SYMBOL(phy_drivers_unregister);
1247 static struct phy_driver genphy_driver[] = {
1249 .phy_id = 0xffffffff,
1250 .phy_id_mask = 0xffffffff,
1251 .name = "Generic PHY",
1252 .config_init = genphy_config_init,
1254 .config_aneg = genphy_config_aneg,
1255 .read_status = genphy_read_status,
1256 .suspend = genphy_suspend,
1257 .resume = genphy_resume,
1258 .driver = { .owner = THIS_MODULE, },
1260 .phy_id = 0xffffffff,
1261 .phy_id_mask = 0xffffffff,
1262 .name = "Generic 10G PHY",
1263 .config_init = gen10g_config_init,
1265 .config_aneg = gen10g_config_aneg,
1266 .read_status = gen10g_read_status,
1267 .suspend = gen10g_suspend,
1268 .resume = gen10g_resume,
1269 .driver = {.owner = THIS_MODULE, },
1272 static int __init phy_init(void)
1276 rc = mdio_bus_init();
1280 rc = phy_drivers_register(genphy_driver,
1281 ARRAY_SIZE(genphy_driver));
1288 static void __exit phy_exit(void)
1290 phy_drivers_unregister(genphy_driver,
1291 ARRAY_SIZE(genphy_driver));
1295 subsys_initcall(phy_init);
1296 module_exit(phy_exit);