2 /* MDIO Bus interface
73 	if (mdiodev->bus->mdio_map[mdiodev->addr])  in mdiobus_register_device()
89 	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;  in mdiobus_register_device()
97 	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)  in mdiobus_unregister_device()
102 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;  in mdiobus_unregister_device()
108 static struct mdio_device *mdiobus_find_device(struct mii_bus *bus, int addr)  in mdiobus_find_device()  argument
110 	bool addr_valid = addr >= 0 && addr < ARRAY_SIZE(bus->mdio_map);  in mdiobus_find_device()
115 	return bus->mdio_map[addr];  in mdiobus_find_device()
118 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)  in mdiobus_get_phy()  argument
122 	mdiodev = mdiobus_find_device(bus, addr);  in mdiobus_get_phy()
133 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)  in mdiobus_is_registered_device()  argument
135 	return mdiobus_find_device(bus, addr) != NULL;  in mdiobus_is_registered_device()
142  * If non-zero, then bus->priv is points to that memory.
144  * Description: called by a bus driver to allocate an mii_bus
149 	struct mii_bus *bus;  in mdiobus_alloc_size()  local
150 	size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);  in mdiobus_alloc_size()
158 		alloc_size = sizeof(*bus);  in mdiobus_alloc_size()
160 	bus = kzalloc(alloc_size, GFP_KERNEL);  in mdiobus_alloc_size()
161 	if (!bus)  in mdiobus_alloc_size()
164 	bus->state = MDIOBUS_ALLOCATED;  in mdiobus_alloc_size()
166 		bus->priv = (void *)bus + aligned_size;  in mdiobus_alloc_size()
170 		bus->irq[i] = PHY_POLL;  in mdiobus_alloc_size()
171 		u64_stats_init(&bus->stats[i].syncp);  in mdiobus_alloc_size()
174 	return bus;  in mdiobus_alloc_size()
187 	struct mii_bus *bus = to_mii_bus(d);  in mdiobus_release()  local
189 	WARN(bus->state != MDIOBUS_RELEASED &&  in mdiobus_release()
191 	     bus->state != MDIOBUS_ALLOCATED,  in mdiobus_release()
193 	     bus->id);  in mdiobus_release()
195 	if (bus->state == MDIOBUS_RELEASED)  in mdiobus_release()
198 	kfree(bus);  in mdiobus_release()
220 static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)  in mdio_bus_get_global_stat()  argument
226 		val += mdio_bus_get_stat(&bus->stats[i], offset);  in mdio_bus_get_global_stat()
235 	struct mii_bus *bus = to_mii_bus(dev);  in mdio_bus_stat_field_show()  local
244 		val = mdio_bus_get_global_stat(bus, sattr->field_offset);  in mdio_bus_stat_field_show()
246 		val = mdio_bus_get_stat(&bus->stats[sattr->addr],  in mdio_bus_stat_field_show()
257 	struct mii_bus *bus = mdiodev->bus;  in mdio_bus_device_stat_field_show()  local
266 	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);  in mdio_bus_device_stat_field_show()
418  * and this must be put_deviced'ed once the bus is finished with.
436  * and this must be put once the bus is finished with.
455 /* Walk the list of subnodes of a mdio bus and look for a node that
504 static void of_mdiobus_link_mdiodev(struct mii_bus *bus,  in of_mdiobus_link_mdiodev()  argument
509 	if (dev->of_node || !bus->dev.of_node)  in of_mdiobus_link_mdiodev()
512 	of_mdiobus_find_phy(dev, mdiodev, bus->dev.of_node);  in of_mdiobus_link_mdiodev()
524  * @bus: MDIO bus to create the devices on
529 static int mdiobus_create_device(struct mii_bus *bus,  in mdiobus_create_device()  argument
535 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
551 static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)  in mdiobus_scan()  argument
558 	phydev = get_phy_device(bus, addr, c45);  in mdiobus_scan()
563 	 * in the bus node, and set the of_node pointer in this case.  in mdiobus_scan()
565 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
567 	/* Search for a swnode for the phy in the swnode hierarchy of the bus.  in mdiobus_scan()
570 	if (dev_fwnode(&bus->dev) && !dev_fwnode(&phydev->mdio.dev)) {  in mdiobus_scan()
573 		fwnode = fwnode_get_named_child_node(dev_fwnode(&bus->dev),  in mdiobus_scan()
589  * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
590  * @bus: mii_bus to scan
591  * @addr: address on bus to scan
593  * This function scans one address on the MDIO bus, looking for
600 struct phy_device *mdiobus_scan_c22(struct mii_bus *bus, int addr)  in mdiobus_scan_c22()  argument
602 	return mdiobus_scan(bus, addr, false);  in mdiobus_scan_c22()
607  * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
608  * @bus: mii_bus to scan
609  * @addr: address on bus to scan
611  * This function scans one address on the MDIO bus, looking for
618 static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)  in mdiobus_scan_c45()  argument
620 	return mdiobus_scan(bus, addr, true);  in mdiobus_scan_c45()
623 static int mdiobus_scan_bus_c22(struct mii_bus *bus)  in mdiobus_scan_bus_c22()  argument
628 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c22()
631 			phydev = mdiobus_scan_c22(bus, i);  in mdiobus_scan_bus_c22()
639 static int mdiobus_scan_bus_c45(struct mii_bus *bus)  in mdiobus_scan_bus_c45()  argument
644 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c45()
648 			if (bus->mdio_map[i])  in mdiobus_scan_bus_c45()
651 			phydev = mdiobus_scan_c45(bus, i);  in mdiobus_scan_bus_c45()
660  * transaction on the bus, like accepting a read themselves, and
666 static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)  in mdiobus_prevent_c45_scan()  argument
674 		phydev = mdiobus_get_phy(bus, i);  in mdiobus_prevent_c45_scan()
686  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
687  * @bus: target mii_bus
688  * @owner: module containing bus accessor functions
690  * Description: Called by a bus driver to bring up all the PHYs
691  *   on a given bus, and attach them to the bus. Drivers should use
699 int __mdiobus_register(struct mii_bus *bus, struct module *owner)  in __mdiobus_register()  argument
706 	if (!bus || !bus->name)  in __mdiobus_register()
710 	if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)  in __mdiobus_register()
714 	if (!bus->read && !bus->read_c45)  in __mdiobus_register()
717 	if (bus->parent && bus->parent->of_node)  in __mdiobus_register()
718 		bus->parent->of_node->fwnode.flags |=  in __mdiobus_register()
721 	WARN(bus->state != MDIOBUS_ALLOCATED &&  in __mdiobus_register()
722 	     bus->state != MDIOBUS_UNREGISTERED,  in __mdiobus_register()
723 	     "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id);  in __mdiobus_register()
725 	bus->owner = owner;  in __mdiobus_register()
726 	bus->dev.parent = bus->parent;  in __mdiobus_register()
727 	bus->dev.class = &mdio_bus_class;  in __mdiobus_register()
728 	bus->dev.groups = NULL;  in __mdiobus_register()
729 	dev_set_name(&bus->dev, "%s", bus->id);  in __mdiobus_register()
731 	/* If the bus state is allocated, we're registering a fresh bus  in __mdiobus_register()
733 	 * to the fwnode. This will be dropped when the bus is released.  in __mdiobus_register()
734 	 * If the bus was set to unregistered, it means that the bus was  in __mdiobus_register()
737 	if (bus->state == MDIOBUS_ALLOCATED)  in __mdiobus_register()
738 		fwnode_handle_get(dev_fwnode(&bus->dev));  in __mdiobus_register()
745 	bus->state = MDIOBUS_UNREGISTERED;  in __mdiobus_register()
747 	err = device_register(&bus->dev);  in __mdiobus_register()
749 		pr_err("mii_bus %s failed to register\n", bus->id);  in __mdiobus_register()
753 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
754 	mutex_init(&bus->shared_lock);  in __mdiobus_register()
756 	/* assert bus level PHY GPIO reset */  in __mdiobus_register()
757 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH);  in __mdiobus_register()
759 		err = dev_err_probe(&bus->dev, PTR_ERR(gpiod),  in __mdiobus_register()
761 				    bus->id);  in __mdiobus_register()
762 		device_del(&bus->dev);  in __mdiobus_register()
765 		bus->reset_gpiod = gpiod;  in __mdiobus_register()
766 		fsleep(bus->reset_delay_us);  in __mdiobus_register()
768 		if (bus->reset_post_delay_us > 0)  in __mdiobus_register()
769 			fsleep(bus->reset_post_delay_us);  in __mdiobus_register()
772 	if (bus->reset) {  in __mdiobus_register()
773 		err = bus->reset(bus);  in __mdiobus_register()
778 	if (bus->read) {  in __mdiobus_register()
779 		err = mdiobus_scan_bus_c22(bus);  in __mdiobus_register()
784 	prevent_c45_scan = mdiobus_prevent_c45_scan(bus);  in __mdiobus_register()
786 	if (!prevent_c45_scan && bus->read_c45) {  in __mdiobus_register()
787 		err = mdiobus_scan_bus_c45(bus);  in __mdiobus_register()
792 	mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);  in __mdiobus_register()
794 	bus->state = MDIOBUS_REGISTERED;  in __mdiobus_register()
795 	dev_dbg(&bus->dev, "probed\n");  in __mdiobus_register()
800 		mdiodev = bus->mdio_map[i];  in __mdiobus_register()
809 	if (bus->reset_gpiod)  in __mdiobus_register()
810 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in __mdiobus_register()
812 	device_del(&bus->dev);  in __mdiobus_register()
817 void mdiobus_unregister(struct mii_bus *bus)  in mdiobus_unregister()  argument
822 	if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))  in mdiobus_unregister()
824 	bus->state = MDIOBUS_UNREGISTERED;  in mdiobus_unregister()
827 		mdiodev = bus->mdio_map[i];  in mdiobus_unregister()
839 	if (bus->reset_gpiod)  in mdiobus_unregister()
840 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in mdiobus_unregister()
842 	device_del(&bus->dev);  in mdiobus_unregister()
848  * @bus: mii_bus to free
854 void mdiobus_free(struct mii_bus *bus)  in mdiobus_free()  argument
857 	if (bus->state == MDIOBUS_ALLOCATED) {  in mdiobus_free()
858 		kfree(bus);  in mdiobus_free()
862 	WARN(bus->state != MDIOBUS_UNREGISTERED,  in mdiobus_free()
863 	     "%s: not in UNREGISTERED state\n", bus->id);  in mdiobus_free()
864 	bus->state = MDIOBUS_RELEASED;  in mdiobus_free()
866 	put_device(&bus->dev);  in mdiobus_free()
892  * @bus: the mii_bus struct
896  * Read a MDIO bus register. Caller must hold the mdio bus lock.
900 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in __mdiobus_read()  argument
904 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_read()
906 	if (bus->read)  in __mdiobus_read()
907 		retval = bus->read(bus, addr, regnum);  in __mdiobus_read()
911 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_read()
912 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_read()
920  * @bus: the mii_bus struct
925  * Write a MDIO bus register. Caller must hold the mdio bus lock.
929 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in __mdiobus_write()  argument
933 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_write()
935 	if (bus->write)  in __mdiobus_write()
936 		err = bus->write(bus, addr, regnum, val);  in __mdiobus_write()
940 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_write()
941 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_write()
949  * @bus: the mii_bus struct
960 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in __mdiobus_modify_changed()  argument
965 	ret = __mdiobus_read(bus, addr, regnum);  in __mdiobus_modify_changed()
973 	ret = __mdiobus_write(bus, addr, regnum, new);  in __mdiobus_modify_changed()
981  * @bus: the mii_bus struct
986  * Read a MDIO bus register. Caller must hold the mdio bus lock.
990 int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)  in __mdiobus_c45_read()  argument
994 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_c45_read()
996 	if (bus->read_c45)  in __mdiobus_c45_read()
997 		retval = bus->read_c45(bus, addr, devad, regnum);  in __mdiobus_c45_read()
1001 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_c45_read()
1002 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_c45_read()
1010  * @bus: the mii_bus struct
1016  * Write a MDIO bus register. Caller must hold the mdio bus lock.
1020 int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,  in __mdiobus_c45_write()  argument
1025 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_c45_write()
1027 	if (bus->write_c45)  in __mdiobus_c45_write()
1028 		err = bus->write_c45(bus, addr, devad, regnum, val);  in __mdiobus_c45_write()
1032 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_c45_write()
1033 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_c45_write()
1041  * @bus: the mii_bus struct
1053 static int __mdiobus_c45_modify_changed(struct mii_bus *bus, int addr,  in __mdiobus_c45_modify_changed()  argument
1059 	ret = __mdiobus_c45_read(bus, addr, devad, regnum);  in __mdiobus_c45_modify_changed()
1067 	ret = __mdiobus_c45_write(bus, addr, devad, regnum, new);  in __mdiobus_c45_modify_changed()
1074  * @bus: the mii_bus struct
1078  * In case of nested MDIO bus access avoid lockdep false positives by
1082  * because the bus read/write functions may wait for an interrupt
1085 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read_nested()  argument
1089 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
1090 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read_nested()
1091 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
1099  * @bus: the mii_bus struct
1104  * because the bus read/write functions may wait for an interrupt
1107 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read()  argument
1111 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
1112 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read()
1113 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
1121  * @bus: the mii_bus struct
1127  * because the bus read/write functions may wait for an interrupt
1130 int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)  in mdiobus_c45_read()  argument
1134 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_read()
1135 	retval = __mdiobus_c45_read(bus, addr, devad, regnum);  in mdiobus_c45_read()
1136 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read()
1144  * @bus: the mii_bus struct
1149  * In case of nested MDIO bus access avoid lockdep false positives by
1153  * because the bus read/write functions may wait for an interrupt
1156 int mdiobus_c45_read_nested(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_read_nested()  argument
1161 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_read_nested()
1162 	retval = __mdiobus_c45_read(bus, addr, devad, regnum);  in mdiobus_c45_read_nested()
1163 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read_nested()
1171  * @bus: the mii_bus struct
1176  * In case of nested MDIO bus access avoid lockdep false positives by
1180  * because the bus read/write functions may wait for an interrupt
1183 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write_nested()  argument
1187 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
1188 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write_nested()
1189 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
1197  * @bus: the mii_bus struct
1203  * because the bus read/write functions may wait for an interrupt
1206 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write()  argument
1210 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
1211 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write()
1212 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
1220  * @bus: the mii_bus struct
1227  * because the bus read/write functions may wait for an interrupt
1230 int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,  in mdiobus_c45_write()  argument
1235 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_write()
1236 	err = __mdiobus_c45_write(bus, addr, devad, regnum, val);  in mdiobus_c45_write()
1237 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write()
1245  * @bus: the mii_bus struct
1251  * In case of nested MDIO bus access avoid lockdep false positives by
1255  * because the bus read/write functions may wait for an interrupt
1258 int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_write_nested()  argument
1263 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_write_nested()
1264 	err = __mdiobus_c45_write(bus, addr, devad, regnum, val);  in mdiobus_c45_write_nested()
1265 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write_nested()
1274  * @bus: the mii_bus struct
1280 int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,  in __mdiobus_modify()  argument
1285 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in __mdiobus_modify()
1294  * @bus: the mii_bus struct
1300 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)  in mdiobus_modify()  argument
1304 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify()
1305 	err = __mdiobus_modify(bus, addr, regnum, mask, set);  in mdiobus_modify()
1306 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify()
1315  * @bus: the mii_bus struct
1322 int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum,  in mdiobus_c45_modify()  argument
1327 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify()
1328 	err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum,  in mdiobus_c45_modify()
1330 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify()
1339  * @bus: the mii_bus struct
1345 int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in mdiobus_modify_changed()  argument
1350 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify_changed()
1351 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in mdiobus_modify_changed()
1352 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify_changed()
1361  * @bus: the mii_bus struct
1368 int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_modify_changed()  argument
1373 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify_changed()
1374 	err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum, mask, set);  in mdiobus_c45_modify_changed()
1375 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify_changed()
1474 MODULE_DESCRIPTION("MDIO bus/device layer");