1 // SPDX-License-Identifier: GPL-2.0+
42 #include "mdio-boardinfo.h"
47 	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,  in mdiobus_register_gpiod()
49 	if (IS_ERR(mdiodev->reset_gpio))  in mdiobus_register_gpiod()
50 		return PTR_ERR(mdiodev->reset_gpio);  in mdiobus_register_gpiod()
52 	if (mdiodev->reset_gpio)  in mdiobus_register_gpiod()
53 		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");  in mdiobus_register_gpiod()
62 	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");  in mdiobus_register_reset()
66 	mdiodev->reset_ctrl = reset;  in mdiobus_register_reset()
75 	if (mdiodev->bus->mdio_map[mdiodev->addr])  in mdiobus_register_device()
76 		return -EBUSY;  in mdiobus_register_device()
78 	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {  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()
100 		return -EINVAL;  in mdiobus_unregister_device()
102 	reset_control_put(mdiodev->reset_ctrl);  in mdiobus_unregister_device()
104 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;  in mdiobus_unregister_device()
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()
128 	if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))  in mdiobus_get_phy()
142  * mdiobus_alloc_size - allocate a mii_bus structure
144  * If non-zero, then bus->priv is points to that memory.
166 	bus->state = MDIOBUS_ALLOCATED;  in mdiobus_alloc_size()
168 		bus->priv = (void *)bus + aligned_size;  in mdiobus_alloc_size()
170 	/* Initialise the interrupts to polling and 64-bit seqcounts */  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()
181  * mdiobus_release - mii_bus device release callback
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()
215 		start = u64_stats_fetch_begin(&s->syncp);  in mdio_bus_get_stat()
217 	} while (u64_stats_fetch_retry(&s->syncp, start));  in mdio_bus_get_stat()
228 		val += mdio_bus_get_stat(&bus->stats[i], offset);  in mdio_bus_get_global_stat()
243 	sattr = eattr->var;  in mdio_bus_stat_field_show()
245 	if (sattr->addr < 0)  in mdio_bus_stat_field_show()
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()
249 					sattr->field_offset);  in mdio_bus_stat_field_show()
259 	struct mii_bus *bus = mdiodev->bus;  in mdio_bus_device_stat_field_show()
262 	int addr = mdiodev->addr;  in mdio_bus_device_stat_field_show()
266 	sattr = eattr->var;  in mdio_bus_device_stat_field_show()
268 	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);  in mdio_bus_device_stat_field_show()
279 		-1, offsetof(struct mdio_bus_stats, field)		\
287 		-1, offsetof(struct mdio_bus_stats, field)		\
415  * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
433  * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
460  * auto-probed phy devices to be supplied with information passed in
466 	struct device *dev = &mdiodev->dev;  in of_mdiobus_link_mdiodev()
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()
479 		if (addr == mdiodev->addr) {  in of_mdiobus_link_mdiodev()
496  * mdiobus_create_device - create a full MDIO device given
509 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
511 		return -ENODEV;  in mdiobus_create_device()
513 	strscpy(mdiodev->modalias, bi->modalias,  in mdiobus_create_device()
514 		sizeof(mdiodev->modalias));  in mdiobus_create_device()
515 	mdiodev->bus_match = mdio_device_bus_match;  in mdiobus_create_device()
516 	mdiodev->dev.platform_data = (void *)bi->platform_data;  in mdiobus_create_device()
527 	struct phy_device *phydev = ERR_PTR(-ENODEV);  in mdiobus_scan()
534 	/* For DT, see if the auto-probed phy has a corresponding child  in mdiobus_scan()
537 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
542 		return ERR_PTR(-ENODEV);  in mdiobus_scan()
549  * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
553  * This function scans one address on the MDIO bus, looking for
556  * PHY devices typically do. Hence this function assumes anything
567  * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
571  * This function scans one address on the MDIO bus, looking for
574  * PHY devices typically do. Hence this function assumes anything
588 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c22()
592 			if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))  in mdiobus_scan_bus_c22()
604 		if ((bus->phy_mask & BIT(i)) == 0) {  in mdiobus_scan_bus_c45()
608 			if (bus->mdio_map[i])  in mdiobus_scan_bus_c45()
612 			if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))  in mdiobus_scan_bus_c45()
637 		oui = phydev->phy_id >> 10;  in mdiobus_prevent_c45_scan()
646  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
654  *   PHYs will not be brought up by this function. They are expected
666 	if (!bus || !bus->name)  in __mdiobus_register()
667 		return -EINVAL;  in __mdiobus_register()
670 	if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)  in __mdiobus_register()
671 		return -EINVAL;  in __mdiobus_register()
674 	if (!bus->read && !bus->read_c45)  in __mdiobus_register()
675 		return -EINVAL;  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()
697 	if (bus->state == MDIOBUS_ALLOCATED)  in __mdiobus_register()
698 		fwnode_handle_get(dev_fwnode(&bus->dev));  in __mdiobus_register()
703 	 * State will be updated later in this function in case of success  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()
710 		return -EINVAL;  in __mdiobus_register()
713 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
714 	mutex_init(&bus->shared_lock);  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()
746 	if (!prevent_c45_scan && bus->read_c45) {  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()
764 		mdiodev->device_remove(mdiodev);  in __mdiobus_register()
765 		mdiodev->device_free(mdiodev);  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()
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()
791 		if (mdiodev->reset_gpio)  in mdiobus_unregister()
792 			gpiod_put(mdiodev->reset_gpio);  in mdiobus_unregister()
794 		mdiodev->device_remove(mdiodev);  in mdiobus_unregister()
795 		mdiodev->device_free(mdiodev);  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()
807  * mdiobus_free - free a struct mii_bus
810  * This function releases the reference to the underlying device
817 	if (bus->state == MDIOBUS_ALLOCATED) {  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()
833 	u64_stats_update_begin(&stats->syncp);  in mdiobus_stats_acct()
835 	u64_stats_inc(&stats->transfers);  in mdiobus_stats_acct()
837 		u64_stats_inc(&stats->errors);  in mdiobus_stats_acct()
842 		u64_stats_inc(&stats->reads);  in mdiobus_stats_acct()
844 		u64_stats_inc(&stats->writes);  in mdiobus_stats_acct()
846 	u64_stats_update_end(&stats->syncp);  in mdiobus_stats_acct()
851  * __mdiobus_read - Unlocked version of the mdiobus_read function
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()
869 		retval = -EOPNOTSUPP;  in __mdiobus_read()
872 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_read()
879  * __mdiobus_write - Unlocked version of the mdiobus_write function
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()
898 		err = -EOPNOTSUPP;  in __mdiobus_write()
901 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_write()
908  * __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function
912  * @mask: bit mask of bits to clear
913  * @set: bit mask of bits to set
921 			     u16 mask, u16 set)  in __mdiobus_modify_changed()  argument
929 	new = (ret & ~mask) | set;  in __mdiobus_modify_changed()
940  * __mdiobus_c45_read - Unlocked version of the mdiobus_c45_read function
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()
959 		retval = -EOPNOTSUPP;  in __mdiobus_c45_read()
962 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_c45_read()
969  * __mdiobus_c45_write - Unlocked version of the mdiobus_write function
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()
990 		err = -EOPNOTSUPP;  in __mdiobus_c45_write()
993 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_c45_write()
1000  * __mdiobus_c45_modify_changed - Unlocked version of the mdiobus_modify function
1005  * @mask: bit mask of bits to clear
1006  * @set: bit mask of bits to set
1014 					int devad, u32 regnum, u16 mask,  in __mdiobus_c45_modify_changed()  argument
1023 	new = (ret & ~mask) | set;  in __mdiobus_c45_modify_changed()
1033  * mdiobus_read_nested - Nested version of the mdiobus_read function
1049 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
1051 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
1058  * mdiobus_read - Convenience function for reading a given MII mgmt register
1071 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
1073 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
1080  * mdiobus_c45_read - Convenience function for reading a given MII mgmt register
1094 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_read()
1096 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read()
1103  * mdiobus_c45_read_nested - Nested version of the mdiobus_c45_read function
1121 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_read_nested()
1123 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_read_nested()
1130  * mdiobus_write_nested - Nested version of the mdiobus_write function
1147 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
1149 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
1156  * mdiobus_write - Convenience function for writing a given MII mgmt register
1170 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
1172 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
1179  * mdiobus_c45_write - Convenience function for writing a given MII mgmt register
1195 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_write()
1197 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write()
1204  * mdiobus_c45_write_nested - Nested version of the mdiobus_c45_write function
1223 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_c45_write_nested()
1225 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_write_nested()
1232  * __mdiobus_modify - Convenience function for modifying a given mdio device
1237  * @mask: bit mask of bits to clear
1238  * @set: bit mask of bits to set
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()
1252  * mdiobus_modify - Convenience function for modifying a given mdio device
1257  * @mask: bit mask of bits to clear
1258  * @set: bit mask of bits to set
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()
1273  * mdiobus_c45_modify - Convenience function for modifying a given mdio device
1279  * @mask: bit mask of bits to clear
1280  * @set: bit mask of bits to set
1283 		       u16 mask, u16 set)  in mdiobus_c45_modify()  argument
1287 	mutex_lock(&bus->mdio_lock);  in mdiobus_c45_modify()
1289 					   mask, set);  in mdiobus_c45_modify()
1290 	mutex_unlock(&bus->mdio_lock);  in mdiobus_c45_modify()
1297  * mdiobus_modify_changed - Convenience function for modifying a given mdio
1302  * @mask: bit mask of bits to clear
1303  * @set: bit mask of bits to set
1306 			   u16 mask, u16 set)  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()
1319  * mdiobus_c45_modify_changed - Convenience function for modifying a given mdio
1325  * @mask: bit mask of bits to clear
1326  * @set: bit mask of bits to set
1329 			       u32 regnum, u16 mask, u16 set)  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()
1342  * mdio_bus_match - determine if given MDIO driver supports the given
1349  *   require calling the devices own match function, since different classes
1357 	/* Both the driver and device must type-match */  in mdio_bus_match()
1358 	if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) !=  in mdio_bus_match()
1359 	    !(mdio->flags & MDIO_DEVICE_FLAG_PHY))  in mdio_bus_match()
1365 	if (mdio->bus_match)  in mdio_bus_match()
1366 		return mdio->bus_match(dev, drv);  in mdio_bus_match()
1375 	/* Some devices have extra OF data and an OF-style MODALIAS */  in mdio_uevent()
1377 	if (rc != -ENODEV)  in mdio_uevent()