1 // SPDX-License-Identifier: GPL-2.0+
12 #include <linux/device.h>
41 #include "mdio-boardinfo.h"
46 	mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,  in mdiobus_register_gpiod()
48 	if (IS_ERR(mdiodev->reset_gpio))  in mdiobus_register_gpiod()
49 		return PTR_ERR(mdiodev->reset_gpio);  in mdiobus_register_gpiod()
51 	if (mdiodev->reset_gpio)  in mdiobus_register_gpiod()
52 		gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");  in mdiobus_register_gpiod()
61 	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");  in mdiobus_register_reset()
65 	mdiodev->reset_ctrl = reset;  in mdiobus_register_reset()
74 	if (mdiodev->bus->mdio_map[mdiodev->addr])  in mdiobus_register_device()
75 		return -EBUSY;  in mdiobus_register_device()
77 	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {  in mdiobus_register_device()
90 	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;  in mdiobus_register_device()
98 	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)  in mdiobus_unregister_device()
99 		return -EINVAL;  in mdiobus_unregister_device()
101 	reset_control_put(mdiodev->reset_ctrl);  in mdiobus_unregister_device()
103 	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;  in mdiobus_unregister_device()
109 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)  in mdiobus_get_phy()  argument
113 	if (addr < 0 || addr >= ARRAY_SIZE(bus->mdio_map))  in mdiobus_get_phy()
116 	mdiodev = bus->mdio_map[addr];  in mdiobus_get_phy()
121 	if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))  in mdiobus_get_phy()
128 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)  in mdiobus_is_registered_device()  argument
130 	return bus->mdio_map[addr];  in mdiobus_is_registered_device()
135  * mdiobus_alloc_size - allocate a mii_bus structure
137  * If non-zero, then bus->priv is points to that memory.
159 	bus->state = MDIOBUS_ALLOCATED;  in mdiobus_alloc_size()
161 		bus->priv = (void *)bus + aligned_size;  in mdiobus_alloc_size()
163 	/* Initialise the interrupts to polling and 64-bit seqcounts */  in mdiobus_alloc_size()
165 		bus->irq[i] = PHY_POLL;  in mdiobus_alloc_size()
166 		u64_stats_init(&bus->stats[i].syncp);  in mdiobus_alloc_size()
174  * mdiobus_release - mii_bus device release callback
175  * @d: the target struct device that contains the mii_bus
180 static void mdiobus_release(struct device *d)  in mdiobus_release()
183 	BUG_ON(bus->state != MDIOBUS_RELEASED &&  in mdiobus_release()
185 	       bus->state != MDIOBUS_ALLOCATED);  in mdiobus_release()
190 	int addr;  member
201 		start = u64_stats_fetch_begin(&s->syncp);  in mdio_bus_get_stat()
203 	} while (u64_stats_fetch_retry(&s->syncp, start));  in mdio_bus_get_stat()
214 		val += mdio_bus_get_stat(&bus->stats[i], offset);  in mdio_bus_get_global_stat()
219 static ssize_t mdio_bus_stat_field_show(struct device *dev,  in mdio_bus_stat_field_show()
229 	sattr = eattr->var;  in mdio_bus_stat_field_show()
231 	if (sattr->addr < 0)  in mdio_bus_stat_field_show()
232 		val = mdio_bus_get_global_stat(bus, sattr->field_offset);  in mdio_bus_stat_field_show()
234 		val = mdio_bus_get_stat(&bus->stats[sattr->addr],  in mdio_bus_stat_field_show()
235 					sattr->field_offset);  in mdio_bus_stat_field_show()
240 static ssize_t mdio_bus_device_stat_field_show(struct device *dev,  in mdio_bus_device_stat_field_show()
245 	struct mii_bus *bus = mdiodev->bus;  in mdio_bus_device_stat_field_show()
248 	int addr = mdiodev->addr;  in mdio_bus_device_stat_field_show()  local
252 	sattr = eattr->var;  in mdio_bus_device_stat_field_show()
254 	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);  in mdio_bus_device_stat_field_show()
265 		-1, offsetof(struct mdio_bus_stats, field)		\
273 		-1, offsetof(struct mdio_bus_stats, field)		\
285 #define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file)		\  argument
286 static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \
291 		addr, offsetof(struct mdio_bus_stats, field)		\
295 #define MDIO_BUS_STATS_ADDR_ATTR(field, addr)				\  argument
296 	MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr,			\
297 				 __stringify(field) "_" __stringify(addr))
299 #define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr)			\  argument
300 	MDIO_BUS_STATS_ADDR_ATTR(transfers, addr);			\
301 	MDIO_BUS_STATS_ADDR_ATTR(errors, addr);				\
302 	MDIO_BUS_STATS_ADDR_ATTR(writes, addr);				\
303 	MDIO_BUS_STATS_ADDR_ATTR(reads, addr)				\
338 #define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr)				\  argument
339 	&dev_attr_mdio_bus_addr_transfers_##addr.attr.attr,		\
340 	&dev_attr_mdio_bus_addr_errors_##addr.attr.attr,		\
341 	&dev_attr_mdio_bus_addr_writes_##addr.attr.attr,		\
342 	&dev_attr_mdio_bus_addr_reads_##addr.attr.attr			\
401  * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
405  * embedded struct device will have its reference count incremented,
410 	struct device *d;  in mdio_find_bus()
419  * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
423  * embedded struct device will have its reference count incremented,
433 	struct device *d;  in of_mdio_find_bus()
444  * matches the mdio device's address with its 'reg' property. If
445  * found, set the of_node pointer for the mdio device. This allows
446  * auto-probed phy devices to be supplied with information passed in
452 	struct device *dev = &mdiodev->dev;  in of_mdiobus_link_mdiodev()
455 	if (dev->of_node || !bus->dev.of_node)  in of_mdiobus_link_mdiodev()
458 	for_each_available_child_of_node(bus->dev.of_node, child) {  in of_mdiobus_link_mdiodev()
459 		int addr;  in of_mdiobus_link_mdiodev()  local
461 		addr = of_mdio_parse_addr(dev, child);  in of_mdiobus_link_mdiodev()
462 		if (addr < 0)  in of_mdiobus_link_mdiodev()
465 		if (addr == mdiodev->addr) {  in of_mdiobus_link_mdiodev()
479  * mdiobus_create_device_from_board_info - create a full MDIO device given
492 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
494 		return -ENODEV;  in mdiobus_create_device()
496 	strncpy(mdiodev->modalias, bi->modalias,  in mdiobus_create_device()
497 		sizeof(mdiodev->modalias));  in mdiobus_create_device()
498 	mdiodev->bus_match = mdio_device_bus_match;  in mdiobus_create_device()
499 	mdiodev->dev.platform_data = (void *)bi->platform_data;  in mdiobus_create_device()
509  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
528 	if (NULL == bus || NULL == bus->name ||  in __mdiobus_register()
529 	    NULL == bus->read || NULL == bus->write)  in __mdiobus_register()
530 		return -EINVAL;  in __mdiobus_register()
532 	BUG_ON(bus->state != MDIOBUS_ALLOCATED &&  in __mdiobus_register()
533 	       bus->state != MDIOBUS_UNREGISTERED);  in __mdiobus_register()
535 	bus->owner = owner;  in __mdiobus_register()
536 	bus->dev.parent = bus->parent;  in __mdiobus_register()
537 	bus->dev.class = &mdio_bus_class;  in __mdiobus_register()
538 	bus->dev.groups = NULL;  in __mdiobus_register()
539 	dev_set_name(&bus->dev, "%s", bus->id);  in __mdiobus_register()
542 	 * the device in mdiobus_free()  in __mdiobus_register()
546 	bus->state = MDIOBUS_UNREGISTERED;  in __mdiobus_register()
548 	err = device_register(&bus->dev);  in __mdiobus_register()
550 		pr_err("mii_bus %s failed to register\n", bus->id);  in __mdiobus_register()
551 		return -EINVAL;  in __mdiobus_register()
554 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
555 	mutex_init(&bus->shared_lock);  in __mdiobus_register()
557 	/* de-assert bus level PHY GPIO reset */  in __mdiobus_register()
558 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);  in __mdiobus_register()
560 		dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",  in __mdiobus_register()
561 			bus->id);  in __mdiobus_register()
562 		device_del(&bus->dev);  in __mdiobus_register()
565 		bus->reset_gpiod = gpiod;  in __mdiobus_register()
568 		fsleep(bus->reset_delay_us);  in __mdiobus_register()
570 		if (bus->reset_post_delay_us > 0)  in __mdiobus_register()
571 			fsleep(bus->reset_post_delay_us);  in __mdiobus_register()
574 	if (bus->reset) {  in __mdiobus_register()
575 		err = bus->reset(bus);  in __mdiobus_register()
581 		if ((bus->phy_mask & BIT(i)) == 0) {  in __mdiobus_register()
585 			if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {  in __mdiobus_register()
594 	bus->state = MDIOBUS_REGISTERED;  in __mdiobus_register()
595 	dev_dbg(&bus->dev, "probed\n");  in __mdiobus_register()
599 	while (--i >= 0) {  in __mdiobus_register()
600 		mdiodev = bus->mdio_map[i];  in __mdiobus_register()
604 		mdiodev->device_remove(mdiodev);  in __mdiobus_register()
605 		mdiodev->device_free(mdiodev);  in __mdiobus_register()
609 	if (bus->reset_gpiod)  in __mdiobus_register()
610 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in __mdiobus_register()
612 	device_del(&bus->dev);  in __mdiobus_register()
622 	if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))  in mdiobus_unregister()
624 	bus->state = MDIOBUS_UNREGISTERED;  in mdiobus_unregister()
627 		mdiodev = bus->mdio_map[i];  in mdiobus_unregister()
631 		if (mdiodev->reset_gpio)  in mdiobus_unregister()
632 			gpiod_put(mdiodev->reset_gpio);  in mdiobus_unregister()
634 		mdiodev->device_remove(mdiodev);  in mdiobus_unregister()
635 		mdiodev->device_free(mdiodev);  in mdiobus_unregister()
639 	if (bus->reset_gpiod)  in mdiobus_unregister()
640 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in mdiobus_unregister()
642 	device_del(&bus->dev);  in mdiobus_unregister()
647  * mdiobus_free - free a struct mii_bus
650  * This function releases the reference to the underlying device
657 	if (bus->state == MDIOBUS_ALLOCATED) {  in mdiobus_free()
662 	BUG_ON(bus->state != MDIOBUS_UNREGISTERED);  in mdiobus_free()
663 	bus->state = MDIOBUS_RELEASED;  in mdiobus_free()
665 	put_device(&bus->dev);  in mdiobus_free()
670  * mdiobus_scan - scan a bus for MDIO devices.
672  * @addr: address on bus to scan
681 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)  in mdiobus_scan()  argument
683 	struct phy_device *phydev = ERR_PTR(-ENODEV);  in mdiobus_scan()
686 	switch (bus->probe_capabilities) {  in mdiobus_scan()
689 		phydev = get_phy_device(bus, addr, false);  in mdiobus_scan()
692 		phydev = get_phy_device(bus, addr, true);  in mdiobus_scan()
695 		phydev = get_phy_device(bus, addr, false);  in mdiobus_scan()
697 			phydev = get_phy_device(bus, addr, true);  in mdiobus_scan()
705 	 * For DT, see if the auto-probed phy has a correspoding child  in mdiobus_scan()
708 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
713 		return ERR_PTR(-ENODEV);  in mdiobus_scan()
723 	u64_stats_update_begin(&stats->syncp);  in mdiobus_stats_acct()
725 	u64_stats_inc(&stats->transfers);  in mdiobus_stats_acct()
727 		u64_stats_inc(&stats->errors);  in mdiobus_stats_acct()
732 		u64_stats_inc(&stats->reads);  in mdiobus_stats_acct()
734 		u64_stats_inc(&stats->writes);  in mdiobus_stats_acct()
736 	u64_stats_update_end(&stats->syncp);  in mdiobus_stats_acct()
741  * __mdiobus_read - Unlocked version of the mdiobus_read function
743  * @addr: the phy address
750 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in __mdiobus_read()  argument
754 	WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));  in __mdiobus_read()
756 	if (addr >= PHY_MAX_ADDR)  in __mdiobus_read()
757 		return -ENXIO;  in __mdiobus_read()
759 	if (bus->read)  in __mdiobus_read()
760 		retval = bus->read(bus, addr, regnum);  in __mdiobus_read()
762 		retval = -EOPNOTSUPP;  in __mdiobus_read()
764 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_read()
765 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_read()
772  * __mdiobus_write - Unlocked version of the mdiobus_write function
774  * @addr: the phy address
782 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in __mdiobus_write()  argument
786 	WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));  in __mdiobus_write()
788 	if (addr >= PHY_MAX_ADDR)  in __mdiobus_write()
789 		return -ENXIO;  in __mdiobus_write()
791 	if (bus->write)  in __mdiobus_write()
792 		err = bus->write(bus, addr, regnum, val);  in __mdiobus_write()
794 		err = -EOPNOTSUPP;  in __mdiobus_write()
796 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_write()
797 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_write()
804  * __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function
806  * @addr: the phy address
812  * device. Any error returns a negative number.
816 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in __mdiobus_modify_changed()  argument
821 	ret = __mdiobus_read(bus, addr, regnum);  in __mdiobus_modify_changed()
829 	ret = __mdiobus_write(bus, addr, regnum, new);  in __mdiobus_modify_changed()
836  * mdiobus_read_nested - Nested version of the mdiobus_read function
838  * @addr: the phy address
848 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read_nested()  argument
852 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
853 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read_nested()
854 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
861  * mdiobus_read - Convenience function for reading a given MII mgmt register
863  * @addr: the phy address
870 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read()  argument
874 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
875 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read()
876 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
883  * mdiobus_write_nested - Nested version of the mdiobus_write function
885  * @addr: the phy address
896 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write_nested()  argument
900 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
901 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write_nested()
902 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
909  * mdiobus_write - Convenience function for writing a given MII mgmt register
911  * @addr: the phy address
919 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write()  argument
923 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
924 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write()
925 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
932  * mdiobus_modify - Convenience function for modifying a given mdio device
935  * @addr: the phy address
940 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)  in mdiobus_modify()  argument
944 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify()
945 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in mdiobus_modify()
946 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify()
953  * mdio_bus_match - determine if given MDIO driver supports the given
954  *		    MDIO device
955  * @dev: target MDIO device
958  * Description: Given a MDIO device, and a MDIO driver, return 1 if
959  *   the driver supports the device.  Otherwise, return 0. This may
963 static int mdio_bus_match(struct device *dev, struct device_driver *drv)  in mdio_bus_match()
970 	if (mdio->bus_match)  in mdio_bus_match()
971 		return mdio->bus_match(dev, drv);  in mdio_bus_match()
976 static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)  in mdio_uevent()
980 	/* Some devices have extra OF data and an OF-style MODALIAS */  in mdio_uevent()
982 	if (rc != -ENODEV)  in mdio_uevent()
1039 MODULE_DESCRIPTION("MDIO bus/device layer");