2 /* MDIO Bus interface
75 	if (mdiodev->bus->mdio_map[mdiodev->addr])  in mdiobus_register_device()
91 	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;  in mdiobus_register_device()
99 	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)  in mdiobus_unregister_device()
104 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;  in mdiobus_unregister_device()
110 static struct mdio_device *mdiobus_find_device(struct mii_bus *bus, int addr)  in mdiobus_find_device()  argument
112 	bool addr_valid = addr >= 0 && addr < ARRAY_SIZE(bus->mdio_map);  in mdiobus_find_device()
117 	return bus->mdio_map[addr];  in mdiobus_find_device()
120 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)  in mdiobus_get_phy()  argument
124 	mdiodev = mdiobus_find_device(bus, addr);  in mdiobus_get_phy()
135 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)  in mdiobus_is_registered_device()  argument
137 	return mdiobus_find_device(bus, addr) != NULL;  in mdiobus_is_registered_device()
144  * If non-zero, then bus->priv is points to that memory.
146  * Description: called by a bus driver to allocate an mii_bus
151 	struct mii_bus *bus;  in mdiobus_alloc_size()  local
152 	size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);  in mdiobus_alloc_size()
160 		alloc_size = sizeof(*bus);  in mdiobus_alloc_size()
162 	bus = kzalloc(alloc_size, GFP_KERNEL);  in mdiobus_alloc_size()
163 	if (!bus)  in mdiobus_alloc_size()
166 	bus->state = MDIOBUS_ALLOCATED;  in mdiobus_alloc_size()
168 		bus->priv = (void *)bus + aligned_size;  in mdiobus_alloc_size()
172 		bus->irq[i] = PHY_POLL;  in mdiobus_alloc_size()
173 		u64_stats_init(&bus->stats[i].syncp);  in mdiobus_alloc_size()
176 	return bus;  in mdiobus_alloc_size()
189 	struct mii_bus *bus = to_mii_bus(d);  in mdiobus_release()  local
191 	WARN(bus->state != MDIOBUS_RELEASED &&  in mdiobus_release()
193 	     bus->state != MDIOBUS_ALLOCATED,  in mdiobus_release()
195 	     bus->id);  in mdiobus_release()
196 	kfree(bus);  in mdiobus_release()
218 static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)  in mdio_bus_get_global_stat()  argument
224 		val += mdio_bus_get_stat(&bus->stats[i], offset);  in mdio_bus_get_global_stat()
233 	struct mii_bus *bus = to_mii_bus(dev);  in mdio_bus_stat_field_show()  local
242 		val = mdio_bus_get_global_stat(bus, sattr->field_offset);  in mdio_bus_stat_field_show()
244 		val = mdio_bus_get_stat(&bus->stats[sattr->addr],  in mdio_bus_stat_field_show()
255 	struct mii_bus *bus = mdiodev->bus;  in mdio_bus_device_stat_field_show()  local
264 	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);  in mdio_bus_device_stat_field_show()
416  * and this must be put_deviced'ed once the bus is finished with.
434  * and this must be put once the bus is finished with.
453 /* Walk the list of subnodes of a mdio bus and look for a node that
459 static void of_mdiobus_link_mdiodev(struct mii_bus *bus,  in of_mdiobus_link_mdiodev()  argument
465 	if (dev->of_node || !bus->dev.of_node)  in of_mdiobus_link_mdiodev()
468 	for_each_available_child_of_node(bus->dev.of_node, child) {  in of_mdiobus_link_mdiodev()
494  * @bus: MDIO bus to create the devices on
499 static int mdiobus_create_device(struct mii_bus *bus,  in mdiobus_create_device()  argument
505 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
521 static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)  in mdiobus_scan()  argument
526 	phydev = get_phy_device(bus, addr, c45);  in mdiobus_scan()
531 	 * in the bus node, and set the of_node pointer in this case.  in mdiobus_scan()
533 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
545  * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
546  * @bus: mii_bus to scan
547  * @addr: address on bus to scan
549  * This function scans one address on the MDIO bus, looking for
556 struct phy_device *mdiobus_scan_c22(struct mii_bus *bus, int addr)  in mdiobus_scan_c22()  argument
558 	return mdiobus_scan(bus, addr, false);  in mdiobus_scan_c22()
563  * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
564  * @bus: mii_bus to scan
565  * @addr: address on bus to scan
567  * This function scans one address on the MDIO bus, looking for
574 static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)  in mdiobus_scan_c45()  argument
576 	return mdiobus_scan(bus, addr, true);  in mdiobus_scan_c45()
579 static int mdiobus_scan_bus_c22(struct mii_bus *bus)  in mdiobus_scan_bus_c22()  argument
584 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c22()
587 			phydev = mdiobus_scan_c22(bus, i);  in mdiobus_scan_bus_c22()
595 static int mdiobus_scan_bus_c45(struct mii_bus *bus)  in mdiobus_scan_bus_c45()  argument
600 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c45()
604 			if (bus->mdio_map[i])  in mdiobus_scan_bus_c45()
607 			phydev = mdiobus_scan_c45(bus, i);  in mdiobus_scan_bus_c45()
616  * transaction on the bus, like accepting a read themselves, and
622 static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)  in mdiobus_prevent_c45_scan()  argument
630 		phydev = mdiobus_get_phy(bus, i);  in mdiobus_prevent_c45_scan()
642  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
643  * @bus: target mii_bus
644  * @owner: module containing bus accessor functions
646  * Description: Called by a bus driver to bring up all the PHYs
647  *   on a given bus, and attach them to the bus. Drivers should use
655 int __mdiobus_register(struct mii_bus *bus, struct module *owner)  in __mdiobus_register()  argument
662 	if (!bus || !bus->name)  in __mdiobus_register()
666 	if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)  in __mdiobus_register()
670 	if (!bus->read && !bus->read_c45)  in __mdiobus_register()
673 	if (bus->parent && bus->parent->of_node)  in __mdiobus_register()
674 		bus->parent->of_node->fwnode.flags |=  in __mdiobus_register()
677 	WARN(bus->state != MDIOBUS_ALLOCATED &&  in __mdiobus_register()
678 	     bus->state != MDIOBUS_UNREGISTERED,  in __mdiobus_register()
679 	     "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id);  in __mdiobus_register()
681 	bus->owner = owner;  in __mdiobus_register()
682 	bus->dev.parent = bus->parent;  in __mdiobus_register()
683 	bus->dev.class = &mdio_bus_class;  in __mdiobus_register()
684 	bus->dev.groups = NULL;  in __mdiobus_register()
685 	dev_set_name(&bus->dev, "%s", bus->id);  in __mdiobus_register()
692 	bus->state = MDIOBUS_UNREGISTERED;  in __mdiobus_register()
694 	err = device_register(&bus->dev);  in __mdiobus_register()
696 		pr_err("mii_bus %s failed to register\n", bus->id);  in __mdiobus_register()
700 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
701 	mutex_init(&bus->shared_lock);  in __mdiobus_register()
703 	/* assert bus level PHY GPIO reset */  in __mdiobus_register()
704 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH);  in __mdiobus_register()
706 		err = dev_err_probe(&bus->dev, PTR_ERR(gpiod),  in __mdiobus_register()
708 				    bus->id);  in __mdiobus_register()
709 		device_del(&bus->dev);  in __mdiobus_register()
712 		bus->reset_gpiod = gpiod;  in __mdiobus_register()
713 		fsleep(bus->reset_delay_us);  in __mdiobus_register()
715 		if (bus->reset_post_delay_us > 0)  in __mdiobus_register()
716 			fsleep(bus->reset_post_delay_us);  in __mdiobus_register()
719 	if (bus->reset) {  in __mdiobus_register()
720 		err = bus->reset(bus);  in __mdiobus_register()
725 	if (bus->read) {  in __mdiobus_register()
726 		err = mdiobus_scan_bus_c22(bus);  in __mdiobus_register()
731 	prevent_c45_scan = mdiobus_prevent_c45_scan(bus);  in __mdiobus_register()
733 	if (!prevent_c45_scan && bus->read_c45) {  in __mdiobus_register()
734 		err = mdiobus_scan_bus_c45(bus);  in __mdiobus_register()
739 	mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);  in __mdiobus_register()
741 	bus->state = MDIOBUS_REGISTERED;  in __mdiobus_register()
742 	dev_dbg(&bus->dev, "probed\n");  in __mdiobus_register()
747 		mdiodev = bus->mdio_map[i];  in __mdiobus_register()
756 	if (bus->reset_gpiod)  in __mdiobus_register()
757 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in __mdiobus_register()
759 	device_del(&bus->dev);  in __mdiobus_register()
764 void mdiobus_unregister(struct mii_bus *bus)  in mdiobus_unregister()  argument
769 	if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))  in mdiobus_unregister()
771 	bus->state = MDIOBUS_UNREGISTERED;  in mdiobus_unregister()
774 		mdiodev = bus->mdio_map[i];  in mdiobus_unregister()
786 	if (bus->reset_gpiod)  in mdiobus_unregister()
787 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in mdiobus_unregister()
789 	device_del(&bus->dev);  in mdiobus_unregister()
795  * @bus: mii_bus to free
801 void mdiobus_free(struct mii_bus *bus)  in mdiobus_free()  argument
804 	if (bus->state == MDIOBUS_ALLOCATED) {  in mdiobus_free()
805 		kfree(bus);  in mdiobus_free()
809 	WARN(bus->state != MDIOBUS_UNREGISTERED,  in mdiobus_free()
810 	     "%s: not in UNREGISTERED state\n", bus->id);  in mdiobus_free()
811 	bus->state = MDIOBUS_RELEASED;  in mdiobus_free()
813 	put_device(&bus->dev);  in mdiobus_free()
839  * @bus: the mii_bus struct
843  * Read a MDIO bus register. Caller must hold the mdio bus lock.
847 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in __mdiobus_read()  argument
851 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_read()
853 	if (bus->read)  in __mdiobus_read()
854 		retval = bus->read(bus, addr, regnum);  in __mdiobus_read()
858 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_read()
859 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_read()
867  * @bus: the mii_bus struct
872  * Write a MDIO bus register. Caller must hold the mdio bus lock.
876 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in __mdiobus_write()  argument
880 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_write()
882 	if (bus->write)  in __mdiobus_write()
883 		err = bus->write(bus, addr, regnum, val);  in __mdiobus_write()
887 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_write()
888 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_write()
896  * @bus: the mii_bus struct
907 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in __mdiobus_modify_changed()  argument
912 	ret = __mdiobus_read(bus, addr, regnum);  in __mdiobus_modify_changed()
920 	ret = __mdiobus_write(bus, addr, regnum, new);  in __mdiobus_modify_changed()
928  * @bus: the mii_bus struct
933  * Read a MDIO bus register. Caller must hold the mdio bus lock.
937 int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)  in __mdiobus_c45_read()  argument
941 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_c45_read()
943 	if (bus->read_c45)  in __mdiobus_c45_read()
944 		retval = bus->read_c45(bus, addr, devad, regnum);  in __mdiobus_c45_read()
948 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_c45_read()
949 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_c45_read()
957  * @bus: the mii_bus struct
963  * Write a MDIO bus register. Caller must hold the mdio bus lock.
967 int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,  in __mdiobus_c45_write()  argument
972 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_c45_write()
974 	if (bus->write_c45)  in __mdiobus_c45_write()
975 		err = bus->write_c45(bus, addr, devad, regnum, val);  in __mdiobus_c45_write()
979 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_c45_write()
980 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_c45_write()
988  * @bus: the mii_bus struct
1000 static int __mdiobus_c45_modify_changed(struct mii_bus *bus, int addr,  in __mdiobus_c45_modify_changed()  argument
1006 	ret = __mdiobus_c45_read(bus, addr, devad, regnum);  in __mdiobus_c45_modify_changed()
1014 	ret = __mdiobus_c45_write(bus, addr, devad, regnum, new);  in __mdiobus_c45_modify_changed()
1021  * @bus: the mii_bus struct
1025  * In case of nested MDIO bus access avoid lockdep false positives by
1029  * because the bus read/write functions may wait for an interrupt
1032 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read_nested()  argument
1036 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
1037 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read_nested()
1038 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
1046  * @bus: the mii_bus struct
1051  * because the bus read/write functions may wait for an interrupt
1054 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read()  argument
1058 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
1059 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read()
1060 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
1068  * @bus: the mii_bus struct
1074  * because the bus read/write functions may wait for an interrupt
1077 int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)  in mdiobus_c45_read()  argument
1081 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_read()
1082 	retval = __mdiobus_c45_read(bus, addr, devad, regnum);  in mdiobus_c45_read()
1083 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read()
1091  * @bus: the mii_bus struct
1096  * In case of nested MDIO bus access avoid lockdep false positives by
1100  * because the bus read/write functions may wait for an interrupt
1103 int mdiobus_c45_read_nested(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_read_nested()  argument
1108 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_read_nested()
1109 	retval = __mdiobus_c45_read(bus, addr, devad, regnum);  in mdiobus_c45_read_nested()
1110 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read_nested()
1118  * @bus: the mii_bus struct
1123  * In case of nested MDIO bus access avoid lockdep false positives by
1127  * because the bus read/write functions may wait for an interrupt
1130 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write_nested()  argument
1134 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
1135 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write_nested()
1136 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
1144  * @bus: the mii_bus struct
1150  * because the bus read/write functions may wait for an interrupt
1153 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write()  argument
1157 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
1158 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write()
1159 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
1167  * @bus: the mii_bus struct
1174  * because the bus read/write functions may wait for an interrupt
1177 int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,  in mdiobus_c45_write()  argument
1182 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_write()
1183 	err = __mdiobus_c45_write(bus, addr, devad, regnum, val);  in mdiobus_c45_write()
1184 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write()
1192  * @bus: the mii_bus struct
1198  * In case of nested MDIO bus access avoid lockdep false positives by
1202  * because the bus read/write functions may wait for an interrupt
1205 int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_write_nested()  argument
1210 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_write_nested()
1211 	err = __mdiobus_c45_write(bus, addr, devad, regnum, val);  in mdiobus_c45_write_nested()
1212 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write_nested()
1221  * @bus: the mii_bus struct
1227 int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,  in __mdiobus_modify()  argument
1232 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in __mdiobus_modify()
1241  * @bus: the mii_bus struct
1247 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)  in mdiobus_modify()  argument
1251 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify()
1252 	err = __mdiobus_modify(bus, addr, regnum, mask, set);  in mdiobus_modify()
1253 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify()
1262  * @bus: the mii_bus struct
1269 int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum,  in mdiobus_c45_modify()  argument
1274 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify()
1275 	err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum,  in mdiobus_c45_modify()
1277 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify()
1286  * @bus: the mii_bus struct
1292 int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in mdiobus_modify_changed()  argument
1297 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify_changed()
1298 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in mdiobus_modify_changed()
1299 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify_changed()
1308  * @bus: the mii_bus struct
1315 int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_modify_changed()  argument
1320 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify_changed()
1321 	err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum, mask, set);  in mdiobus_c45_modify_changed()
1322 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify_changed()
1421 MODULE_DESCRIPTION("MDIO bus/device layer");