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()
197 	if (bus->state == MDIOBUS_RELEASED)  in mdiobus_release()
200 	kfree(bus);  in mdiobus_release()
222 static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)  in mdio_bus_get_global_stat()  argument
228 		val += mdio_bus_get_stat(&bus->stats[i], offset);  in mdio_bus_get_global_stat()
237 	struct mii_bus *bus = to_mii_bus(dev);  in mdio_bus_stat_field_show()  local
246 		val = mdio_bus_get_global_stat(bus, sattr->field_offset);  in mdio_bus_stat_field_show()
248 		val = mdio_bus_get_stat(&bus->stats[sattr->addr],  in mdio_bus_stat_field_show()
259 	struct mii_bus *bus = mdiodev->bus;  in mdio_bus_device_stat_field_show()  local
268 	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);  in mdio_bus_device_stat_field_show()
420  * and this must be put_deviced'ed once the bus is finished with.
438  * and this must be put once the bus is finished with.
457 /* Walk the list of subnodes of a mdio bus and look for a node that
463 static void of_mdiobus_link_mdiodev(struct mii_bus *bus,  in of_mdiobus_link_mdiodev()  argument
469 	if (dev->of_node || !bus->dev.of_node)  in of_mdiobus_link_mdiodev()
472 	for_each_available_child_of_node(bus->dev.of_node, child) {  in of_mdiobus_link_mdiodev()
498  * @bus: MDIO bus to create the devices on
503 static int mdiobus_create_device(struct mii_bus *bus,  in mdiobus_create_device()  argument
509 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
525 static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)  in mdiobus_scan()  argument
530 	phydev = get_phy_device(bus, addr, c45);  in mdiobus_scan()
535 	 * in the bus node, and set the of_node pointer in this case.  in mdiobus_scan()
537 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
549  * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
550  * @bus: mii_bus to scan
551  * @addr: address on bus to scan
553  * This function scans one address on the MDIO bus, looking for
560 struct phy_device *mdiobus_scan_c22(struct mii_bus *bus, int addr)  in mdiobus_scan_c22()  argument
562 	return mdiobus_scan(bus, addr, false);  in mdiobus_scan_c22()
567  * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
568  * @bus: mii_bus to scan
569  * @addr: address on bus to scan
571  * This function scans one address on the MDIO bus, looking for
578 static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)  in mdiobus_scan_c45()  argument
580 	return mdiobus_scan(bus, addr, true);  in mdiobus_scan_c45()
583 static int mdiobus_scan_bus_c22(struct mii_bus *bus)  in mdiobus_scan_bus_c22()  argument
588 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c22()
591 			phydev = mdiobus_scan_c22(bus, i);  in mdiobus_scan_bus_c22()
599 static int mdiobus_scan_bus_c45(struct mii_bus *bus)  in mdiobus_scan_bus_c45()  argument
604 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c45()
608 			if (bus->mdio_map[i])  in mdiobus_scan_bus_c45()
611 			phydev = mdiobus_scan_c45(bus, i);  in mdiobus_scan_bus_c45()
620  * transaction on the bus, like accepting a read themselves, and
626 static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)  in mdiobus_prevent_c45_scan()  argument
634 		phydev = mdiobus_get_phy(bus, i);  in mdiobus_prevent_c45_scan()
646  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
647  * @bus: target mii_bus
648  * @owner: module containing bus accessor functions
650  * Description: Called by a bus driver to bring up all the PHYs
651  *   on a given bus, and attach them to the bus. Drivers should use
659 int __mdiobus_register(struct mii_bus *bus, struct module *owner)  in __mdiobus_register()  argument
666 	if (!bus || !bus->name)  in __mdiobus_register()
670 	if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)  in __mdiobus_register()
674 	if (!bus->read && !bus->read_c45)  in __mdiobus_register()
677 	if (bus->parent && bus->parent->of_node)  in __mdiobus_register()
678 		bus->parent->of_node->fwnode.flags |=  in __mdiobus_register()
681 	WARN(bus->state != MDIOBUS_ALLOCATED &&  in __mdiobus_register()
682 	     bus->state != MDIOBUS_UNREGISTERED,  in __mdiobus_register()
683 	     "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id);  in __mdiobus_register()
685 	bus->owner = owner;  in __mdiobus_register()
686 	bus->dev.parent = bus->parent;  in __mdiobus_register()
687 	bus->dev.class = &mdio_bus_class;  in __mdiobus_register()
688 	bus->dev.groups = NULL;  in __mdiobus_register()
689 	dev_set_name(&bus->dev, "%s", bus->id);  in __mdiobus_register()
691 	/* If the bus state is allocated, we're registering a fresh bus  in __mdiobus_register()
693 	 * to the fwnode. This will be dropped when the bus is released.  in __mdiobus_register()
694 	 * If the bus was set to unregistered, it means that the bus was  in __mdiobus_register()
697 	if (bus->state == MDIOBUS_ALLOCATED)  in __mdiobus_register()
698 		fwnode_handle_get(dev_fwnode(&bus->dev));  in __mdiobus_register()
705 	bus->state = MDIOBUS_UNREGISTERED;  in __mdiobus_register()
707 	err = device_register(&bus->dev);  in __mdiobus_register()
709 		pr_err("mii_bus %s failed to register\n", bus->id);  in __mdiobus_register()
713 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
714 	mutex_init(&bus->shared_lock);  in __mdiobus_register()
716 	/* assert bus level PHY GPIO reset */  in __mdiobus_register()
717 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH);  in __mdiobus_register()
719 		err = dev_err_probe(&bus->dev, PTR_ERR(gpiod),  in __mdiobus_register()
721 				    bus->id);  in __mdiobus_register()
722 		device_del(&bus->dev);  in __mdiobus_register()
725 		bus->reset_gpiod = gpiod;  in __mdiobus_register()
726 		fsleep(bus->reset_delay_us);  in __mdiobus_register()
728 		if (bus->reset_post_delay_us > 0)  in __mdiobus_register()
729 			fsleep(bus->reset_post_delay_us);  in __mdiobus_register()
732 	if (bus->reset) {  in __mdiobus_register()
733 		err = bus->reset(bus);  in __mdiobus_register()
738 	if (bus->read) {  in __mdiobus_register()
739 		err = mdiobus_scan_bus_c22(bus);  in __mdiobus_register()
744 	prevent_c45_scan = mdiobus_prevent_c45_scan(bus);  in __mdiobus_register()
746 	if (!prevent_c45_scan && bus->read_c45) {  in __mdiobus_register()
747 		err = mdiobus_scan_bus_c45(bus);  in __mdiobus_register()
752 	mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);  in __mdiobus_register()
754 	bus->state = MDIOBUS_REGISTERED;  in __mdiobus_register()
755 	dev_dbg(&bus->dev, "probed\n");  in __mdiobus_register()
760 		mdiodev = bus->mdio_map[i];  in __mdiobus_register()
769 	if (bus->reset_gpiod)  in __mdiobus_register()
770 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in __mdiobus_register()
772 	device_del(&bus->dev);  in __mdiobus_register()
777 void mdiobus_unregister(struct mii_bus *bus)  in mdiobus_unregister()  argument
782 	if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))  in mdiobus_unregister()
784 	bus->state = MDIOBUS_UNREGISTERED;  in mdiobus_unregister()
787 		mdiodev = bus->mdio_map[i];  in mdiobus_unregister()
799 	if (bus->reset_gpiod)  in mdiobus_unregister()
800 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in mdiobus_unregister()
802 	device_del(&bus->dev);  in mdiobus_unregister()
808  * @bus: mii_bus to free
814 void mdiobus_free(struct mii_bus *bus)  in mdiobus_free()  argument
817 	if (bus->state == MDIOBUS_ALLOCATED) {  in mdiobus_free()
818 		kfree(bus);  in mdiobus_free()
822 	WARN(bus->state != MDIOBUS_UNREGISTERED,  in mdiobus_free()
823 	     "%s: not in UNREGISTERED state\n", bus->id);  in mdiobus_free()
824 	bus->state = MDIOBUS_RELEASED;  in mdiobus_free()
826 	put_device(&bus->dev);  in mdiobus_free()
852  * @bus: the mii_bus struct
856  * Read a MDIO bus register. Caller must hold the mdio bus lock.
860 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in __mdiobus_read()  argument
864 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_read()
866 	if (bus->read)  in __mdiobus_read()
867 		retval = bus->read(bus, addr, regnum);  in __mdiobus_read()
871 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_read()
872 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_read()
880  * @bus: the mii_bus struct
885  * Write a MDIO bus register. Caller must hold the mdio bus lock.
889 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in __mdiobus_write()  argument
893 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_write()
895 	if (bus->write)  in __mdiobus_write()
896 		err = bus->write(bus, addr, regnum, val);  in __mdiobus_write()
900 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_write()
901 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_write()
909  * @bus: the mii_bus struct
920 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in __mdiobus_modify_changed()  argument
925 	ret = __mdiobus_read(bus, addr, regnum);  in __mdiobus_modify_changed()
933 	ret = __mdiobus_write(bus, addr, regnum, new);  in __mdiobus_modify_changed()
941  * @bus: the mii_bus struct
946  * Read a MDIO bus register. Caller must hold the mdio bus lock.
950 int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)  in __mdiobus_c45_read()  argument
954 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_c45_read()
956 	if (bus->read_c45)  in __mdiobus_c45_read()
957 		retval = bus->read_c45(bus, addr, devad, regnum);  in __mdiobus_c45_read()
961 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_c45_read()
962 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_c45_read()
970  * @bus: the mii_bus struct
976  * Write a MDIO bus register. Caller must hold the mdio bus lock.
980 int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,  in __mdiobus_c45_write()  argument
985 	lockdep_assert_held_once(&bus->mdio_lock);  in __mdiobus_c45_write()
987 	if (bus->write_c45)  in __mdiobus_c45_write()
988 		err = bus->write_c45(bus, addr, devad, regnum, val);  in __mdiobus_c45_write()
992 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_c45_write()
993 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_c45_write()
1001  * @bus: the mii_bus struct
1013 static int __mdiobus_c45_modify_changed(struct mii_bus *bus, int addr,  in __mdiobus_c45_modify_changed()  argument
1019 	ret = __mdiobus_c45_read(bus, addr, devad, regnum);  in __mdiobus_c45_modify_changed()
1027 	ret = __mdiobus_c45_write(bus, addr, devad, regnum, new);  in __mdiobus_c45_modify_changed()
1034  * @bus: the mii_bus struct
1038  * In case of nested MDIO bus access avoid lockdep false positives by
1042  * because the bus read/write functions may wait for an interrupt
1045 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read_nested()  argument
1049 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
1050 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read_nested()
1051 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
1059  * @bus: the mii_bus struct
1064  * because the bus read/write functions may wait for an interrupt
1067 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read()  argument
1071 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
1072 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read()
1073 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
1081  * @bus: the mii_bus struct
1087  * because the bus read/write functions may wait for an interrupt
1090 int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)  in mdiobus_c45_read()  argument
1094 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_read()
1095 	retval = __mdiobus_c45_read(bus, addr, devad, regnum);  in mdiobus_c45_read()
1096 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read()
1104  * @bus: the mii_bus struct
1109  * In case of nested MDIO bus access avoid lockdep false positives by
1113  * because the bus read/write functions may wait for an interrupt
1116 int mdiobus_c45_read_nested(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_read_nested()  argument
1121 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_read_nested()
1122 	retval = __mdiobus_c45_read(bus, addr, devad, regnum);  in mdiobus_c45_read_nested()
1123 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read_nested()
1131  * @bus: the mii_bus struct
1136  * In case of nested MDIO bus access avoid lockdep false positives by
1140  * because the bus read/write functions may wait for an interrupt
1143 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write_nested()  argument
1147 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
1148 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write_nested()
1149 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
1157  * @bus: the mii_bus struct
1163  * because the bus read/write functions may wait for an interrupt
1166 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write()  argument
1170 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
1171 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write()
1172 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
1180  * @bus: the mii_bus struct
1187  * because the bus read/write functions may wait for an interrupt
1190 int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,  in mdiobus_c45_write()  argument
1195 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_write()
1196 	err = __mdiobus_c45_write(bus, addr, devad, regnum, val);  in mdiobus_c45_write()
1197 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write()
1205  * @bus: the mii_bus struct
1211  * In case of nested MDIO bus access avoid lockdep false positives by
1215  * because the bus read/write functions may wait for an interrupt
1218 int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_write_nested()  argument
1223 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_write_nested()
1224 	err = __mdiobus_c45_write(bus, addr, devad, regnum, val);  in mdiobus_c45_write_nested()
1225 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write_nested()
1234  * @bus: the mii_bus struct
1240 int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,  in __mdiobus_modify()  argument
1245 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in __mdiobus_modify()
1254  * @bus: the mii_bus struct
1260 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)  in mdiobus_modify()  argument
1264 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify()
1265 	err = __mdiobus_modify(bus, addr, regnum, mask, set);  in mdiobus_modify()
1266 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify()
1275  * @bus: the mii_bus struct
1282 int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum,  in mdiobus_c45_modify()  argument
1287 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify()
1288 	err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum,  in mdiobus_c45_modify()
1290 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify()
1299  * @bus: the mii_bus struct
1305 int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in mdiobus_modify_changed()  argument
1310 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify_changed()
1311 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in mdiobus_modify_changed()
1312 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify_changed()
1321  * @bus: the mii_bus struct
1328 int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad,  in mdiobus_c45_modify_changed()  argument
1333 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify_changed()
1334 	err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum, mask, set);  in mdiobus_c45_modify_changed()
1335 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify_changed()
1434 MODULE_DESCRIPTION("MDIO bus/device layer");