2 /* MDIO Bus interface
83 	if (mdiodev->bus->mdio_map[mdiodev->addr])  in mdiobus_register_device()
99 	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;  in mdiobus_register_device()
107 	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)  in mdiobus_unregister_device()
110 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;  in mdiobus_unregister_device()
116 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)  in mdiobus_get_phy()  argument
118 	struct mdio_device *mdiodev = bus->mdio_map[addr];  in mdiobus_get_phy()
130 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)  in mdiobus_is_registered_device()  argument
132 	return bus->mdio_map[addr];  in mdiobus_is_registered_device()
139  * If non-zero, then bus->priv is points to that memory.
141  * Description: called by a bus driver to allocate an mii_bus
146 	struct mii_bus *bus;  in mdiobus_alloc_size()  local
147 	size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);  in mdiobus_alloc_size()
155 		alloc_size = sizeof(*bus);  in mdiobus_alloc_size()
157 	bus = kzalloc(alloc_size, GFP_KERNEL);  in mdiobus_alloc_size()
158 	if (!bus)  in mdiobus_alloc_size()
161 	bus->state = MDIOBUS_ALLOCATED;  in mdiobus_alloc_size()
163 		bus->priv = (void *)bus + aligned_size;  in mdiobus_alloc_size()
167 		bus->irq[i] = PHY_POLL;  in mdiobus_alloc_size()
169 	return bus;  in mdiobus_alloc_size()
204 	struct mii_bus **ptr, *bus;  in devm_mdiobus_alloc_size()  local
211 	bus = mdiobus_alloc_size(sizeof_priv);  in devm_mdiobus_alloc_size()
212 	if (bus) {  in devm_mdiobus_alloc_size()
213 		*ptr = bus;  in devm_mdiobus_alloc_size()
219 	return bus;  in devm_mdiobus_alloc_size()
226  * @bus:		the mii_bus associated with the device
230 void devm_mdiobus_free(struct device *dev, struct mii_bus *bus)  in devm_mdiobus_free()  argument
235 			    devm_mdiobus_match, bus);  in devm_mdiobus_free()
249 	struct mii_bus *bus = to_mii_bus(d);  in mdiobus_release()  local
250 	BUG_ON(bus->state != MDIOBUS_RELEASED &&  in mdiobus_release()
252 	       bus->state != MDIOBUS_ALLOCATED);  in mdiobus_release()
253 	kfree(bus);  in mdiobus_release()
268  * and this must be put once the bus is finished with.
287 /* Walk the list of subnodes of a mdio bus and look for a node that
293 static void of_mdiobus_link_mdiodev(struct mii_bus *bus,  in of_mdiobus_link_mdiodev()  argument
299 	if (dev->of_node || !bus->dev.of_node)  in of_mdiobus_link_mdiodev()
302 	for_each_available_child_of_node(bus->dev.of_node, child) {  in of_mdiobus_link_mdiodev()
326  * @bus: MDIO bus to create the devices on
331 static int mdiobus_create_device(struct mii_bus *bus,  in mdiobus_create_device()  argument
337 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
354  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
355  * @bus: target mii_bus
356  * @owner: module containing bus accessor functions
358  * Description: Called by a bus driver to bring up all the PHYs
359  *   on a given bus, and attach them to the bus. Drivers should use
367 int __mdiobus_register(struct mii_bus *bus, struct module *owner)  in __mdiobus_register()  argument
373 	if (NULL == bus || NULL == bus->name ||  in __mdiobus_register()
374 	    NULL == bus->read || NULL == bus->write)  in __mdiobus_register()
377 	BUG_ON(bus->state != MDIOBUS_ALLOCATED &&  in __mdiobus_register()
378 	       bus->state != MDIOBUS_UNREGISTERED);  in __mdiobus_register()
380 	bus->owner = owner;  in __mdiobus_register()
381 	bus->dev.parent = bus->parent;  in __mdiobus_register()
382 	bus->dev.class = &mdio_bus_class;  in __mdiobus_register()
383 	bus->dev.groups = NULL;  in __mdiobus_register()
384 	dev_set_name(&bus->dev, "%s", bus->id);  in __mdiobus_register()
386 	err = device_register(&bus->dev);  in __mdiobus_register()
388 		pr_err("mii_bus %s failed to register\n", bus->id);  in __mdiobus_register()
392 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
394 	/* de-assert bus level PHY GPIO reset */  in __mdiobus_register()
395 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);  in __mdiobus_register()
397 		dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",  in __mdiobus_register()
398 			bus->id);  in __mdiobus_register()
399 		device_del(&bus->dev);  in __mdiobus_register()
402 		bus->reset_gpiod = gpiod;  in __mdiobus_register()
405 		udelay(bus->reset_delay_us);  in __mdiobus_register()
409 	if (bus->reset)  in __mdiobus_register()
410 		bus->reset(bus);  in __mdiobus_register()
413 		if ((bus->phy_mask & (1 << i)) == 0) {  in __mdiobus_register()
416 			phydev = mdiobus_scan(bus, i);  in __mdiobus_register()
424 	mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);  in __mdiobus_register()
426 	bus->state = MDIOBUS_REGISTERED;  in __mdiobus_register()
427 	pr_info("%s: probed\n", bus->name);  in __mdiobus_register()
432 		mdiodev = bus->mdio_map[i];  in __mdiobus_register()
441 	if (bus->reset_gpiod)  in __mdiobus_register()
442 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in __mdiobus_register()
444 	device_del(&bus->dev);  in __mdiobus_register()
449 void mdiobus_unregister(struct mii_bus *bus)  in mdiobus_unregister()  argument
454 	BUG_ON(bus->state != MDIOBUS_REGISTERED);  in mdiobus_unregister()
455 	bus->state = MDIOBUS_UNREGISTERED;  in mdiobus_unregister()
458 		mdiodev = bus->mdio_map[i];  in mdiobus_unregister()
470 	if (bus->reset_gpiod)  in mdiobus_unregister()
471 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in mdiobus_unregister()
473 	device_del(&bus->dev);  in mdiobus_unregister()
479  * @bus: mii_bus to free
485 void mdiobus_free(struct mii_bus *bus)  in mdiobus_free()  argument
488 	if (bus->state == MDIOBUS_ALLOCATED) {  in mdiobus_free()
489 		kfree(bus);  in mdiobus_free()
493 	BUG_ON(bus->state != MDIOBUS_UNREGISTERED);  in mdiobus_free()
494 	bus->state = MDIOBUS_RELEASED;  in mdiobus_free()
496 	put_device(&bus->dev);  in mdiobus_free()
501  * mdiobus_scan - scan a bus for MDIO devices.
502  * @bus: mii_bus to scan
503  * @addr: address on bus to scan
505  * This function scans the MDIO bus, looking for devices which can be
512 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)  in mdiobus_scan()  argument
517 	phydev = get_phy_device(bus, addr, false);  in mdiobus_scan()
523 	 * in the bus node, and set the of_node pointer in this case.  in mdiobus_scan()
525 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
539  * @bus: the mii_bus struct
543  * Read a MDIO bus register. Caller must hold the mdio bus lock.
547 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in __mdiobus_read()  argument
551 	WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));  in __mdiobus_read()
553 	retval = bus->read(bus, addr, regnum);  in __mdiobus_read()
555 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_read()
563  * @bus: the mii_bus struct
568  * Write a MDIO bus register. Caller must hold the mdio bus lock.
572 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in __mdiobus_write()  argument
576 	WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));  in __mdiobus_write()
578 	err = bus->write(bus, addr, regnum, val);  in __mdiobus_write()
580 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_write()
588  * @bus: the mii_bus struct
592  * In case of nested MDIO bus access avoid lockdep false positives by
596  * because the bus read/write functions may wait for an interrupt
599 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read_nested()  argument
605 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
606 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read_nested()
607 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
615  * @bus: the mii_bus struct
620  * because the bus read/write functions may wait for an interrupt
623 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read()  argument
629 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
630 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read()
631 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
639  * @bus: the mii_bus struct
644  * In case of nested MDIO bus access avoid lockdep false positives by
648  * because the bus read/write functions may wait for an interrupt
651 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write_nested()  argument
657 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
658 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write_nested()
659 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
667  * @bus: the mii_bus struct
673  * because the bus read/write functions may wait for an interrupt
676 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write()  argument
682 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
683 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write()
684 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
759 MODULE_DESCRIPTION("MDIO bus/device layer");