1 files changed, 8 insertions, 468 deletions

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index ede596c1a69d..a6bcb0fee863 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -8,17 +8,14 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
-#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
-#include <linux/micrel_phy.h>
 #include <linux/mii.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -27,7 +24,6 @@
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/reset.h>
-#include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
@@ -37,8 +33,6 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/mdio.h>
 
-#include "mdio-boardinfo.h"
-
 static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
 {
 	/* Deassert the optional reset signal */
@@ -137,45 +131,6 @@ bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
 EXPORT_SYMBOL(mdiobus_is_registered_device);
 
 /**
- * mdiobus_alloc_size - allocate a mii_bus structure
- * @size: extra amount of memory to allocate for private storage.
- * If non-zero, then bus->priv is points to that memory.
- *
- * Description: called by a bus driver to allocate an mii_bus
- * structure to fill in.
- */
-struct mii_bus *mdiobus_alloc_size(size_t size)
-{
-	struct mii_bus *bus;
-	size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
-	size_t alloc_size;
-	int i;
-
-	/* If we alloc extra space, it should be aligned */
-	if (size)
-		alloc_size = aligned_size + size;
-	else
-		alloc_size = sizeof(*bus);
-
-	bus = kzalloc(alloc_size, GFP_KERNEL);
-	if (!bus)
-		return NULL;
-
-	bus->state = MDIOBUS_ALLOCATED;
-	if (size)
-		bus->priv = (void *)bus + aligned_size;
-
-	/* Initialise the interrupts to polling and 64-bit seqcounts */
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		bus->irq[i] = PHY_POLL;
-		u64_stats_init(&bus->stats[i].syncp);
-	}
-
-	return bus;
-}
-EXPORT_SYMBOL(mdiobus_alloc_size);
-
-/**
  * mdiobus_release - mii_bus device release callback
  * @d: the target struct device that contains the mii_bus
  *
@@ -403,11 +358,12 @@ static const struct attribute_group *mdio_bus_groups[] = {
 	NULL,
 };
 
-static struct class mdio_bus_class = {
+const struct class mdio_bus_class = {
 	.name		= "mdio_bus",
 	.dev_release	= mdiobus_release,
 	.dev_groups	= mdio_bus_groups,
 };
+EXPORT_SYMBOL_GPL(mdio_bus_class);
 
 /**
  * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
@@ -451,422 +407,8 @@ struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
 	return d ? to_mii_bus(d) : NULL;
 }
 EXPORT_SYMBOL(of_mdio_find_bus);
-
-/* Walk the list of subnodes of a mdio bus and look for a node that
- * matches the mdio device's address with its 'reg' property. If
- * found, set the of_node pointer for the mdio device. This allows
- * auto-probed phy devices to be supplied with information passed in
- * via DT.
- * If a PHY package is found, PHY is searched also there.
- */
-static int of_mdiobus_find_phy(struct device *dev, struct mdio_device *mdiodev,
-			       struct device_node *np)
-{
-	struct device_node *child;
-
-	for_each_available_child_of_node(np, child) {
-		int addr;
-
-		if (of_node_name_eq(child, "ethernet-phy-package")) {
-			/* Validate PHY package reg presence */
-			if (!of_property_present(child, "reg")) {
-				of_node_put(child);
-				return -EINVAL;
-			}
-
-			if (!of_mdiobus_find_phy(dev, mdiodev, child)) {
-				/* The refcount for the PHY package will be
-				 * incremented later when PHY join the Package.
-				 */
-				of_node_put(child);
-				return 0;
-			}
-
-			continue;
-		}
-
-		addr = of_mdio_parse_addr(dev, child);
-		if (addr < 0)
-			continue;
-
-		if (addr == mdiodev->addr) {
-			device_set_node(dev, of_fwnode_handle(child));
-			/* The refcount on "child" is passed to the mdio
-			 * device. Do _not_ use of_node_put(child) here.
-			 */
-			return 0;
-		}
-	}
-
-	return -ENODEV;
-}
-
-static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
-				    struct mdio_device *mdiodev)
-{
-	struct device *dev = &mdiodev->dev;
-
-	if (dev->of_node || !bus->dev.of_node)
-		return;
-
-	of_mdiobus_find_phy(dev, mdiodev, bus->dev.of_node);
-}
-#else /* !IS_ENABLED(CONFIG_OF_MDIO) */
-static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio,
-					   struct mdio_device *mdiodev)
-{
-}
 #endif
 
-/**
- * mdiobus_create_device - create a full MDIO device given
- * a mdio_board_info structure
- * @bus: MDIO bus to create the devices on
- * @bi: mdio_board_info structure describing the devices
- *
- * Returns 0 on success or < 0 on error.
- */
-static int mdiobus_create_device(struct mii_bus *bus,
-				 struct mdio_board_info *bi)
-{
-	struct mdio_device *mdiodev;
-	int ret = 0;
-
-	mdiodev = mdio_device_create(bus, bi->mdio_addr);
-	if (IS_ERR(mdiodev))
-		return -ENODEV;
-
-	strscpy(mdiodev->modalias, bi->modalias,
-		sizeof(mdiodev->modalias));
-	mdiodev->bus_match = mdio_device_bus_match;
-	mdiodev->dev.platform_data = (void *)bi->platform_data;
-
-	ret = mdio_device_register(mdiodev);
-	if (ret)
-		mdio_device_free(mdiodev);
-
-	return ret;
-}
-
-static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)
-{
-	struct phy_device *phydev = ERR_PTR(-ENODEV);
-	struct fwnode_handle *fwnode;
-	char node_name[16];
-	int err;
-
-	phydev = get_phy_device(bus, addr, c45);
-	if (IS_ERR(phydev))
-		return phydev;
-
-	/* For DT, see if the auto-probed phy has a corresponding child
-	 * in the bus node, and set the of_node pointer in this case.
-	 */
-	of_mdiobus_link_mdiodev(bus, &phydev->mdio);
-
-	/* Search for a swnode for the phy in the swnode hierarchy of the bus.
-	 * If there is no swnode for the phy provided, just ignore it.
-	 */
-	if (dev_fwnode(&bus->dev) && !dev_fwnode(&phydev->mdio.dev)) {
-		snprintf(node_name, sizeof(node_name), "ethernet-phy@%d",
-			 addr);
-		fwnode = fwnode_get_named_child_node(dev_fwnode(&bus->dev),
-						     node_name);
-		if (fwnode)
-			device_set_node(&phydev->mdio.dev, fwnode);
-	}
-
-	err = phy_device_register(phydev);
-	if (err) {
-		phy_device_free(phydev);
-		return ERR_PTR(-ENODEV);
-	}
-
-	return phydev;
-}
-
-/**
- * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
- * @bus: mii_bus to scan
- * @addr: address on bus to scan
- *
- * This function scans one address on the MDIO bus, looking for
- * devices which can be identified using a vendor/product ID in
- * registers 2 and 3. Not all MDIO devices have such registers, but
- * PHY devices typically do. Hence this function assumes anything
- * found is a PHY, or can be treated as a PHY. Other MDIO devices,
- * such as switches, will probably not be found during the scan.
- */
-struct phy_device *mdiobus_scan_c22(struct mii_bus *bus, int addr)
-{
-	return mdiobus_scan(bus, addr, false);
-}
-EXPORT_SYMBOL(mdiobus_scan_c22);
-
-/**
- * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
- * @bus: mii_bus to scan
- * @addr: address on bus to scan
- *
- * This function scans one address on the MDIO bus, looking for
- * devices which can be identified using a vendor/product ID in
- * registers 2 and 3. Not all MDIO devices have such registers, but
- * PHY devices typically do. Hence this function assumes anything
- * found is a PHY, or can be treated as a PHY. Other MDIO devices,
- * such as switches, will probably not be found during the scan.
- */
-static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)
-{
-	return mdiobus_scan(bus, addr, true);
-}
-
-static int mdiobus_scan_bus_c22(struct mii_bus *bus)
-{
-	int i;
-
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		if ((bus->phy_mask & BIT(i)) == 0) {
-			struct phy_device *phydev;
-
-			phydev = mdiobus_scan_c22(bus, i);
-			if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))
-				return PTR_ERR(phydev);
-		}
-	}
-	return 0;
-}
-
-static int mdiobus_scan_bus_c45(struct mii_bus *bus)
-{
-	int i;
-
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		if ((bus->phy_mask & BIT(i)) == 0) {
-			struct phy_device *phydev;
-
-			/* Don't scan C45 if we already have a C22 device */
-			if (bus->mdio_map[i])
-				continue;
-
-			phydev = mdiobus_scan_c45(bus, i);
-			if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))
-				return PTR_ERR(phydev);
-		}
-	}
-	return 0;
-}
-
-/* There are some C22 PHYs which do bad things when where is a C45
- * transaction on the bus, like accepting a read themselves, and
- * stomping over the true devices reply, to performing a write to
- * themselves which was intended for another device. Now that C22
- * devices have been found, see if any of them are bad for C45, and if we
- * should skip the C45 scan.
- */
-static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)
-{
-	int i;
-
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		struct phy_device *phydev;
-		u32 oui;
-
-		phydev = mdiobus_get_phy(bus, i);
-		if (!phydev)
-			continue;
-		oui = phydev->phy_id >> 10;
-
-		if (oui == MICREL_OUI)
-			return true;
-	}
-	return false;
-}
-
-/**
- * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
- * @bus: target mii_bus
- * @owner: module containing bus accessor functions
- *
- * Description: Called by a bus driver to bring up all the PHYs
- *   on a given bus, and attach them to the bus. Drivers should use
- *   mdiobus_register() rather than __mdiobus_register() unless they
- *   need to pass a specific owner module. MDIO devices which are not
- *   PHYs will not be brought up by this function. They are expected
- *   to be explicitly listed in DT and instantiated by of_mdiobus_register().
- *
- * Returns 0 on success or < 0 on error.
- */
-int __mdiobus_register(struct mii_bus *bus, struct module *owner)
-{
-	struct mdio_device *mdiodev;
-	struct gpio_desc *gpiod;
-	bool prevent_c45_scan;
-	int i, err;
-
-	if (!bus || !bus->name)
-		return -EINVAL;
-
-	/* An access method always needs both read and write operations */
-	if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)
-		return -EINVAL;
-
-	/* At least one method is mandatory */
-	if (!bus->read && !bus->read_c45)
-		return -EINVAL;
-
-	if (bus->parent && bus->parent->of_node)
-		bus->parent->of_node->fwnode.flags |=
-					FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD;
-
-	WARN(bus->state != MDIOBUS_ALLOCATED &&
-	     bus->state != MDIOBUS_UNREGISTERED,
-	     "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id);
-
-	bus->owner = owner;
-	bus->dev.parent = bus->parent;
-	bus->dev.class = &mdio_bus_class;
-	bus->dev.groups = NULL;
-	dev_set_name(&bus->dev, "%s", bus->id);
-
-	/* If the bus state is allocated, we're registering a fresh bus
-	 * that may have a fwnode associated with it. Grab a reference
-	 * to the fwnode. This will be dropped when the bus is released.
-	 * If the bus was set to unregistered, it means that the bus was
-	 * previously registered, and we've already grabbed a reference.
-	 */
-	if (bus->state == MDIOBUS_ALLOCATED)
-		fwnode_handle_get(dev_fwnode(&bus->dev));
-
-	/* We need to set state to MDIOBUS_UNREGISTERED to correctly release
-	 * the device in mdiobus_free()
-	 *
-	 * State will be updated later in this function in case of success
-	 */
-	bus->state = MDIOBUS_UNREGISTERED;
-
-	err = device_register(&bus->dev);
-	if (err) {
-		pr_err("mii_bus %s failed to register\n", bus->id);
-		return -EINVAL;
-	}
-
-	mutex_init(&bus->mdio_lock);
-	mutex_init(&bus->shared_lock);
-
-	/* assert bus level PHY GPIO reset */
-	gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(gpiod)) {
-		err = dev_err_probe(&bus->dev, PTR_ERR(gpiod),
-				    "mii_bus %s couldn't get reset GPIO\n",
-				    bus->id);
-		device_del(&bus->dev);
-		return err;
-	} else	if (gpiod) {
-		bus->reset_gpiod = gpiod;
-		fsleep(bus->reset_delay_us);
-		gpiod_set_value_cansleep(gpiod, 0);
-		if (bus->reset_post_delay_us > 0)
-			fsleep(bus->reset_post_delay_us);
-	}
-
-	if (bus->reset) {
-		err = bus->reset(bus);
-		if (err)
-			goto error_reset_gpiod;
-	}
-
-	if (bus->read) {
-		err = mdiobus_scan_bus_c22(bus);
-		if (err)
-			goto error;
-	}
-
-	prevent_c45_scan = mdiobus_prevent_c45_scan(bus);
-
-	if (!prevent_c45_scan && bus->read_c45) {
-		err = mdiobus_scan_bus_c45(bus);
-		if (err)
-			goto error;
-	}
-
-	mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);
-
-	bus->state = MDIOBUS_REGISTERED;
-	dev_dbg(&bus->dev, "probed\n");
-	return 0;
-
-error:
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		mdiodev = bus->mdio_map[i];
-		if (!mdiodev)
-			continue;
-
-		mdiodev->device_remove(mdiodev);
-		mdiodev->device_free(mdiodev);
-	}
-error_reset_gpiod:
-	/* Put PHYs in RESET to save power */
-	if (bus->reset_gpiod)
-		gpiod_set_value_cansleep(bus->reset_gpiod, 1);
-
-	device_del(&bus->dev);
-	return err;
-}
-EXPORT_SYMBOL(__mdiobus_register);
-
-void mdiobus_unregister(struct mii_bus *bus)
-{
-	struct mdio_device *mdiodev;
-	int i;
-
-	if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))
-		return;
-	bus->state = MDIOBUS_UNREGISTERED;
-
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		mdiodev = bus->mdio_map[i];
-		if (!mdiodev)
-			continue;
-
-		if (mdiodev->reset_gpio)
-			gpiod_put(mdiodev->reset_gpio);
-
-		mdiodev->device_remove(mdiodev);
-		mdiodev->device_free(mdiodev);
-	}
-
-	/* Put PHYs in RESET to save power */
-	if (bus->reset_gpiod)
-		gpiod_set_value_cansleep(bus->reset_gpiod, 1);
-
-	device_del(&bus->dev);
-}
-EXPORT_SYMBOL(mdiobus_unregister);
-
-/**
- * mdiobus_free - free a struct mii_bus
- * @bus: mii_bus to free
- *
- * This function releases the reference to the underlying device
- * object in the mii_bus.  If this is the last reference, the mii_bus
- * will be freed.
- */
-void mdiobus_free(struct mii_bus *bus)
-{
-	/* For compatibility with error handling in drivers. */
-	if (bus->state == MDIOBUS_ALLOCATED) {
-		kfree(bus);
-		return;
-	}
-
-	WARN(bus->state != MDIOBUS_UNREGISTERED,
-	     "%s: not in UNREGISTERED state\n", bus->id);
-	bus->state = MDIOBUS_RELEASED;
-
-	put_device(&bus->dev);
-}
-EXPORT_SYMBOL(mdiobus_free);
-
 static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)
 {
 	preempt_disable();
@@ -1446,7 +988,7 @@ const struct bus_type mdio_bus_type = {
 };
 EXPORT_SYMBOL(mdio_bus_type);
 
-int __init mdio_bus_init(void)
+static int __init mdio_bus_init(void)
 {
 	int ret;
 
@@ -1460,16 +1002,14 @@ int __init mdio_bus_init(void)
 	return ret;
 }
 
-#if IS_ENABLED(CONFIG_PHYLIB)
-void mdio_bus_exit(void)
+static void __exit mdio_bus_exit(void)
 {
 	class_unregister(&mdio_bus_class);
 	bus_unregister(&mdio_bus_type);
 }
-EXPORT_SYMBOL_GPL(mdio_bus_exit);
-#else
-module_init(mdio_bus_init);
-/* no module_exit, intentional */
+
+subsys_initcall(mdio_bus_init);
+module_exit(mdio_bus_exit);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("MDIO bus/device layer");
-#endif