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
111 	struct mdio_device *mdiodev = bus->mdio_map[addr];  in mdiobus_get_phy()
116 	if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))  in mdiobus_get_phy()
123 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)  in mdiobus_is_registered_device()  argument
125 	return bus->mdio_map[addr];  in mdiobus_is_registered_device()
130  * mdiobus_alloc_size - allocate a mii_bus structure
132  * If non-zero, then bus->priv is points to that memory.
154 	bus->state = MDIOBUS_ALLOCATED;  in mdiobus_alloc_size()
156 		bus->priv = (void *)bus + aligned_size;  in mdiobus_alloc_size()
158 	/* Initialise the interrupts to polling and 64-bit seqcounts */  in mdiobus_alloc_size()
160 		bus->irq[i] = PHY_POLL;  in mdiobus_alloc_size()
161 		u64_stats_init(&bus->stats[i].syncp);  in mdiobus_alloc_size()
169  * mdiobus_release - mii_bus device release callback
170  * @d: the target struct device that contains the mii_bus
175 static void mdiobus_release(struct device *d)  in mdiobus_release()
178 	BUG_ON(bus->state != MDIOBUS_RELEASED &&  in mdiobus_release()
180 	       bus->state != MDIOBUS_ALLOCATED);  in mdiobus_release()
185 	int addr;  member
196 		start = u64_stats_fetch_begin(&s->syncp);  in mdio_bus_get_stat()
198 	} while (u64_stats_fetch_retry(&s->syncp, start));  in mdio_bus_get_stat()
209 		val += mdio_bus_get_stat(&bus->stats[i], offset);  in mdio_bus_get_global_stat()
214 static ssize_t mdio_bus_stat_field_show(struct device *dev,  in mdio_bus_stat_field_show()
224 	sattr = eattr->var;  in mdio_bus_stat_field_show()
226 	if (sattr->addr < 0)  in mdio_bus_stat_field_show()
227 		val = mdio_bus_get_global_stat(bus, sattr->field_offset);  in mdio_bus_stat_field_show()
229 		val = mdio_bus_get_stat(&bus->stats[sattr->addr],  in mdio_bus_stat_field_show()
230 					sattr->field_offset);  in mdio_bus_stat_field_show()
235 static ssize_t mdio_bus_device_stat_field_show(struct device *dev,  in mdio_bus_device_stat_field_show()
240 	struct mii_bus *bus = mdiodev->bus;  in mdio_bus_device_stat_field_show()
243 	int addr = mdiodev->addr;  in mdio_bus_device_stat_field_show()  local
247 	sattr = eattr->var;  in mdio_bus_device_stat_field_show()
249 	val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);  in mdio_bus_device_stat_field_show()
260 		-1, offsetof(struct mdio_bus_stats, field)		\
268 		-1, offsetof(struct mdio_bus_stats, field)		\
280 #define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file)		\  argument
281 static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \
286 		addr, offsetof(struct mdio_bus_stats, field)		\
290 #define MDIO_BUS_STATS_ADDR_ATTR(field, addr)				\  argument
291 	MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr,			\
292 				 __stringify(field) "_" __stringify(addr))
294 #define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr)			\  argument
295 	MDIO_BUS_STATS_ADDR_ATTR(transfers, addr);			\
296 	MDIO_BUS_STATS_ADDR_ATTR(errors, addr);				\
297 	MDIO_BUS_STATS_ADDR_ATTR(writes, addr);				\
298 	MDIO_BUS_STATS_ADDR_ATTR(reads, addr)				\
333 #define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr)				\  argument
334 	&dev_attr_mdio_bus_addr_transfers_##addr.attr.attr,		\
335 	&dev_attr_mdio_bus_addr_errors_##addr.attr.attr,		\
336 	&dev_attr_mdio_bus_addr_writes_##addr.attr.attr,		\
337 	&dev_attr_mdio_bus_addr_reads_##addr.attr.attr			\
396  * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
400  * embedded struct device will have its reference count incremented,
405 	struct device *d;  in mdio_find_bus()
414  * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
418  * embedded struct device will have its reference count incremented,
428 	struct device *d;  in of_mdio_find_bus()
439  * matches the mdio device's address with its 'reg' property. If
440  * found, set the of_node pointer for the mdio device. This allows
441  * auto-probed phy devices to be supplied with information passed in
447 	struct device *dev = &mdiodev->dev;  in of_mdiobus_link_mdiodev()
450 	if (dev->of_node || !bus->dev.of_node)  in of_mdiobus_link_mdiodev()
453 	for_each_available_child_of_node(bus->dev.of_node, child) {  in of_mdiobus_link_mdiodev()
454 		int addr;  in of_mdiobus_link_mdiodev()  local
456 		addr = of_mdio_parse_addr(dev, child);  in of_mdiobus_link_mdiodev()
457 		if (addr < 0)  in of_mdiobus_link_mdiodev()
460 		if (addr == mdiodev->addr) {  in of_mdiobus_link_mdiodev()
461 			dev->of_node = child;  in of_mdiobus_link_mdiodev()
462 			dev->fwnode = of_fwnode_handle(child);  in of_mdiobus_link_mdiodev()
475  * mdiobus_create_device_from_board_info - create a full MDIO device given
488 	mdiodev = mdio_device_create(bus, bi->mdio_addr);  in mdiobus_create_device()
490 		return -ENODEV;  in mdiobus_create_device()
492 	strncpy(mdiodev->modalias, bi->modalias,  in mdiobus_create_device()
493 		sizeof(mdiodev->modalias));  in mdiobus_create_device()
494 	mdiodev->bus_match = mdio_device_bus_match;  in mdiobus_create_device()
495 	mdiodev->dev.platform_data = (void *)bi->platform_data;  in mdiobus_create_device()
505  * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
524 	if (NULL == bus || NULL == bus->name ||  in __mdiobus_register()
525 	    NULL == bus->read || NULL == bus->write)  in __mdiobus_register()
526 		return -EINVAL;  in __mdiobus_register()
528 	BUG_ON(bus->state != MDIOBUS_ALLOCATED &&  in __mdiobus_register()
529 	       bus->state != MDIOBUS_UNREGISTERED);  in __mdiobus_register()
531 	bus->owner = owner;  in __mdiobus_register()
532 	bus->dev.parent = bus->parent;  in __mdiobus_register()
533 	bus->dev.class = &mdio_bus_class;  in __mdiobus_register()
534 	bus->dev.groups = NULL;  in __mdiobus_register()
535 	dev_set_name(&bus->dev, "%s", bus->id);  in __mdiobus_register()
538 	 * the device in mdiobus_free()  in __mdiobus_register()
542 	bus->state = MDIOBUS_UNREGISTERED;  in __mdiobus_register()
544 	err = device_register(&bus->dev);  in __mdiobus_register()
546 		pr_err("mii_bus %s failed to register\n", bus->id);  in __mdiobus_register()
547 		return -EINVAL;  in __mdiobus_register()
550 	mutex_init(&bus->mdio_lock);  in __mdiobus_register()
551 	mutex_init(&bus->shared_lock);  in __mdiobus_register()
553 	/* de-assert bus level PHY GPIO reset */  in __mdiobus_register()
554 	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);  in __mdiobus_register()
556 		dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",  in __mdiobus_register()
557 			bus->id);  in __mdiobus_register()
558 		device_del(&bus->dev);  in __mdiobus_register()
561 		bus->reset_gpiod = gpiod;  in __mdiobus_register()
564 		fsleep(bus->reset_delay_us);  in __mdiobus_register()
566 		if (bus->reset_post_delay_us > 0)  in __mdiobus_register()
567 			fsleep(bus->reset_post_delay_us);  in __mdiobus_register()
570 	if (bus->reset) {  in __mdiobus_register()
571 		err = bus->reset(bus);  in __mdiobus_register()
577 		if ((bus->phy_mask & (1 << i)) == 0) {  in __mdiobus_register()
581 			if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {  in __mdiobus_register()
590 	bus->state = MDIOBUS_REGISTERED;  in __mdiobus_register()
591 	dev_dbg(&bus->dev, "probed\n");  in __mdiobus_register()
595 	while (--i >= 0) {  in __mdiobus_register()
596 		mdiodev = bus->mdio_map[i];  in __mdiobus_register()
600 		mdiodev->device_remove(mdiodev);  in __mdiobus_register()
601 		mdiodev->device_free(mdiodev);  in __mdiobus_register()
605 	if (bus->reset_gpiod)  in __mdiobus_register()
606 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in __mdiobus_register()
608 	device_del(&bus->dev);  in __mdiobus_register()
618 	if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))  in mdiobus_unregister()
620 	bus->state = MDIOBUS_UNREGISTERED;  in mdiobus_unregister()
623 		mdiodev = bus->mdio_map[i];  in mdiobus_unregister()
627 		if (mdiodev->reset_gpio)  in mdiobus_unregister()
628 			gpiod_put(mdiodev->reset_gpio);  in mdiobus_unregister()
630 		mdiodev->device_remove(mdiodev);  in mdiobus_unregister()
631 		mdiodev->device_free(mdiodev);  in mdiobus_unregister()
635 	if (bus->reset_gpiod)  in mdiobus_unregister()
636 		gpiod_set_value_cansleep(bus->reset_gpiod, 1);  in mdiobus_unregister()
638 	device_del(&bus->dev);  in mdiobus_unregister()
643  * mdiobus_free - free a struct mii_bus
646  * This function releases the reference to the underlying device
653 	if (bus->state == MDIOBUS_ALLOCATED) {  in mdiobus_free()
658 	BUG_ON(bus->state != MDIOBUS_UNREGISTERED);  in mdiobus_free()
659 	bus->state = MDIOBUS_RELEASED;  in mdiobus_free()
661 	put_device(&bus->dev);  in mdiobus_free()
666  * mdiobus_scan - scan a bus for MDIO devices.
668  * @addr: address on bus to scan
677 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)  in mdiobus_scan()  argument
679 	struct phy_device *phydev = ERR_PTR(-ENODEV);  in mdiobus_scan()
682 	switch (bus->probe_capabilities) {  in mdiobus_scan()
685 		phydev = get_phy_device(bus, addr, false);  in mdiobus_scan()
688 		phydev = get_phy_device(bus, addr, true);  in mdiobus_scan()
691 		phydev = get_phy_device(bus, addr, false);  in mdiobus_scan()
693 			phydev = get_phy_device(bus, addr, true);  in mdiobus_scan()
701 	 * For DT, see if the auto-probed phy has a correspoding child  in mdiobus_scan()
704 	of_mdiobus_link_mdiodev(bus, &phydev->mdio);  in mdiobus_scan()
709 		return ERR_PTR(-ENODEV);  in mdiobus_scan()
719 	u64_stats_update_begin(&stats->syncp);  in mdiobus_stats_acct()
721 	u64_stats_inc(&stats->transfers);  in mdiobus_stats_acct()
723 		u64_stats_inc(&stats->errors);  in mdiobus_stats_acct()
728 		u64_stats_inc(&stats->reads);  in mdiobus_stats_acct()
730 		u64_stats_inc(&stats->writes);  in mdiobus_stats_acct()
732 	u64_stats_update_end(&stats->syncp);  in mdiobus_stats_acct()
737  * __mdiobus_read - Unlocked version of the mdiobus_read function
739  * @addr: the phy address
746 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in __mdiobus_read()  argument
750 	WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));  in __mdiobus_read()
752 	retval = bus->read(bus, addr, regnum);  in __mdiobus_read()
754 	trace_mdio_access(bus, 1, addr, regnum, retval, retval);  in __mdiobus_read()
755 	mdiobus_stats_acct(&bus->stats[addr], true, retval);  in __mdiobus_read()
762  * __mdiobus_write - Unlocked version of the mdiobus_write function
764  * @addr: the phy address
772 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in __mdiobus_write()  argument
776 	WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));  in __mdiobus_write()
778 	err = bus->write(bus, addr, regnum, val);  in __mdiobus_write()
780 	trace_mdio_access(bus, 0, addr, regnum, val, err);  in __mdiobus_write()
781 	mdiobus_stats_acct(&bus->stats[addr], false, err);  in __mdiobus_write()
788  * __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function
790  * @addr: the phy address
796  * device. Any error returns a negative number.
800 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,  in __mdiobus_modify_changed()  argument
805 	ret = __mdiobus_read(bus, addr, regnum);  in __mdiobus_modify_changed()
813 	ret = __mdiobus_write(bus, addr, regnum, new);  in __mdiobus_modify_changed()
820  * mdiobus_read_nested - Nested version of the mdiobus_read function
822  * @addr: the phy address
832 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read_nested()  argument
836 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_read_nested()
837 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read_nested()
838 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read_nested()
845  * mdiobus_read - Convenience function for reading a given MII mgmt register
847  * @addr: the phy address
854 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)  in mdiobus_read()  argument
858 	mutex_lock(&bus->mdio_lock);  in mdiobus_read()
859 	retval = __mdiobus_read(bus, addr, regnum);  in mdiobus_read()
860 	mutex_unlock(&bus->mdio_lock);  in mdiobus_read()
867  * mdiobus_write_nested - Nested version of the mdiobus_write function
869  * @addr: the phy address
880 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write_nested()  argument
884 	mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);  in mdiobus_write_nested()
885 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write_nested()
886 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write_nested()
893  * mdiobus_write - Convenience function for writing a given MII mgmt register
895  * @addr: the phy address
903 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)  in mdiobus_write()  argument
907 	mutex_lock(&bus->mdio_lock);  in mdiobus_write()
908 	err = __mdiobus_write(bus, addr, regnum, val);  in mdiobus_write()
909 	mutex_unlock(&bus->mdio_lock);  in mdiobus_write()
916  * mdiobus_modify - Convenience function for modifying a given mdio device
919  * @addr: the phy address
924 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)  in mdiobus_modify()  argument
928 	mutex_lock(&bus->mdio_lock);  in mdiobus_modify()
929 	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);  in mdiobus_modify()
930 	mutex_unlock(&bus->mdio_lock);  in mdiobus_modify()
937  * mdio_bus_match - determine if given MDIO driver supports the given
938  *		    MDIO device
939  * @dev: target MDIO device
942  * Description: Given a MDIO device, and a MDIO driver, return 1 if
943  *   the driver supports the device.  Otherwise, return 0. This may
947 static int mdio_bus_match(struct device *dev, struct device_driver *drv)  in mdio_bus_match()
954 	if (mdio->bus_match)  in mdio_bus_match()
955 		return mdio->bus_match(dev, drv);  in mdio_bus_match()
960 static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)  in mdio_uevent()
964 	/* Some devices have extra OF data and an OF-style MODALIAS */  in mdio_uevent()
966 	if (rc != -ENODEV)  in mdio_uevent()
1024 MODULE_DESCRIPTION("MDIO bus/device layer");