Initial import

1 files changed, 1407 insertions, 0 deletions

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
new file mode 100644
index 000000000..d551df62e
--- /dev/null
+++ b/drivers/net/phy/phy_device.c
@@ -0,0 +1,1407 @@
+/* Framework for finding and configuring PHYs.
+ * Also contains generic PHY driver
+ *
+ * Author: Andy Fleming
+ *
+ * Copyright (c) 2004 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+#include <linux/mdio.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/of.h>
+
+#include <asm/irq.h>
+
+MODULE_DESCRIPTION("PHY library");
+MODULE_AUTHOR("Andy Fleming");
+MODULE_LICENSE("GPL");
+
+void phy_device_free(struct phy_device *phydev)
+{
+	put_device(&phydev->dev);
+}
+EXPORT_SYMBOL(phy_device_free);
+
+static void phy_device_release(struct device *dev)
+{
+	kfree(to_phy_device(dev));
+}
+
+enum genphy_driver {
+	GENPHY_DRV_1G,
+	GENPHY_DRV_10G,
+	GENPHY_DRV_MAX
+};
+
+static struct phy_driver genphy_driver[GENPHY_DRV_MAX];
+
+static LIST_HEAD(phy_fixup_list);
+static DEFINE_MUTEX(phy_fixup_lock);
+
+/**
+ * phy_register_fixup - creates a new phy_fixup and adds it to the list
+ * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID)
+ * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
+ *	It can also be PHY_ANY_UID
+ * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
+ *	comparison
+ * @run: The actual code to be run when a matching PHY is found
+ */
+int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
+		       int (*run)(struct phy_device *))
+{
+	struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
+
+	if (!fixup)
+		return -ENOMEM;
+
+	strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
+	fixup->phy_uid = phy_uid;
+	fixup->phy_uid_mask = phy_uid_mask;
+	fixup->run = run;
+
+	mutex_lock(&phy_fixup_lock);
+	list_add_tail(&fixup->list, &phy_fixup_list);
+	mutex_unlock(&phy_fixup_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_register_fixup);
+
+/* Registers a fixup to be run on any PHY with the UID in phy_uid */
+int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
+			       int (*run)(struct phy_device *))
+{
+	return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
+}
+EXPORT_SYMBOL(phy_register_fixup_for_uid);
+
+/* Registers a fixup to be run on the PHY with id string bus_id */
+int phy_register_fixup_for_id(const char *bus_id,
+			      int (*run)(struct phy_device *))
+{
+	return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
+}
+EXPORT_SYMBOL(phy_register_fixup_for_id);
+
+/* Returns 1 if fixup matches phydev in bus_id and phy_uid.
+ * Fixups can be set to match any in one or more fields.
+ */
+static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
+{
+	if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0)
+		if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
+			return 0;
+
+	if ((fixup->phy_uid & fixup->phy_uid_mask) !=
+	    (phydev->phy_id & fixup->phy_uid_mask))
+		if (fixup->phy_uid != PHY_ANY_UID)
+			return 0;
+
+	return 1;
+}
+
+/* Runs any matching fixups for this phydev */
+static int phy_scan_fixups(struct phy_device *phydev)
+{
+	struct phy_fixup *fixup;
+
+	mutex_lock(&phy_fixup_lock);
+	list_for_each_entry(fixup, &phy_fixup_list, list) {
+		if (phy_needs_fixup(phydev, fixup)) {
+			int err = fixup->run(phydev);
+
+			if (err < 0) {
+				mutex_unlock(&phy_fixup_lock);
+				return err;
+			}
+			phydev->has_fixups = true;
+		}
+	}
+	mutex_unlock(&phy_fixup_lock);
+
+	return 0;
+}
+
+struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
+				     bool is_c45,
+				     struct phy_c45_device_ids *c45_ids)
+{
+	struct phy_device *dev;
+
+	/* We allocate the device, and initialize the default values */
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (NULL == dev)
+		return (struct phy_device *)PTR_ERR((void *)-ENOMEM);
+
+	dev->dev.release = phy_device_release;
+
+	dev->speed = 0;
+	dev->duplex = -1;
+	dev->pause = 0;
+	dev->asym_pause = 0;
+	dev->link = 1;
+	dev->interface = PHY_INTERFACE_MODE_GMII;
+
+	dev->autoneg = AUTONEG_ENABLE;
+
+	dev->is_c45 = is_c45;
+	dev->addr = addr;
+	dev->phy_id = phy_id;
+	if (c45_ids)
+		dev->c45_ids = *c45_ids;
+	dev->bus = bus;
+	dev->dev.parent = bus->parent;
+	dev->dev.bus = &mdio_bus_type;
+	dev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
+	dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr);
+
+	dev->state = PHY_DOWN;
+
+	mutex_init(&dev->lock);
+	INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
+	INIT_WORK(&dev->phy_queue, phy_change);
+
+	/* Request the appropriate module unconditionally; don't
+	 * bother trying to do so only if it isn't already loaded,
+	 * because that gets complicated. A hotplug event would have
+	 * done an unconditional modprobe anyway.
+	 * We don't do normal hotplug because it won't work for MDIO
+	 * -- because it relies on the device staying around for long
+	 * enough for the driver to get loaded. With MDIO, the NIC
+	 * driver will get bored and give up as soon as it finds that
+	 * there's no driver _already_ loaded.
+	 */
+	request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id));
+
+	device_initialize(&dev->dev);
+
+	return dev;
+}
+EXPORT_SYMBOL(phy_device_create);
+
+/**
+ * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ * @phy_id: where to store the ID retrieved.
+ * @c45_ids: where to store the c45 ID information.
+ *
+ *   If the PHY devices-in-package appears to be valid, it and the
+ *   corresponding identifiers are stored in @c45_ids, zero is stored
+ *   in @phy_id.  Otherwise 0xffffffff is stored in @phy_id.  Returns
+ *   zero on success.
+ *
+ */
+static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
+			   struct phy_c45_device_ids *c45_ids) {
+	int phy_reg;
+	int i, reg_addr;
+	const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
+
+	/* Find first non-zero Devices In package.  Device
+	 * zero is reserved, so don't probe it.
+	 */
+	for (i = 1;
+	     i < num_ids && c45_ids->devices_in_package == 0;
+	     i++) {
+		reg_addr = MII_ADDR_C45 | i << 16 | MDIO_DEVS2;
+		phy_reg = mdiobus_read(bus, addr, reg_addr);
+		if (phy_reg < 0)
+			return -EIO;
+		c45_ids->devices_in_package = (phy_reg & 0xffff) << 16;
+
+		reg_addr = MII_ADDR_C45 | i << 16 | MDIO_DEVS1;
+		phy_reg = mdiobus_read(bus, addr, reg_addr);
+		if (phy_reg < 0)
+			return -EIO;
+		c45_ids->devices_in_package |= (phy_reg & 0xffff);
+
+		/* If mostly Fs, there is no device there,
+		 * let's get out of here.
+		 */
+		if ((c45_ids->devices_in_package & 0x1fffffff) == 0x1fffffff) {
+			*phy_id = 0xffffffff;
+			return 0;
+		}
+	}
+
+	/* Now probe Device Identifiers for each device present. */
+	for (i = 1; i < num_ids; i++) {
+		if (!(c45_ids->devices_in_package & (1 << i)))
+			continue;
+
+		reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1;
+		phy_reg = mdiobus_read(bus, addr, reg_addr);
+		if (phy_reg < 0)
+			return -EIO;
+		c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16;
+
+		reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2;
+		phy_reg = mdiobus_read(bus, addr, reg_addr);
+		if (phy_reg < 0)
+			return -EIO;
+		c45_ids->device_ids[i] |= (phy_reg & 0xffff);
+	}
+	*phy_id = 0;
+	return 0;
+}
+
+/**
+ * get_phy_id - reads the specified addr for its ID.
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ * @phy_id: where to store the ID retrieved.
+ * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
+ * @c45_ids: where to store the c45 ID information.
+ *
+ * Description: In the case of a 802.3-c22 PHY, reads the ID registers
+ *   of the PHY at @addr on the @bus, stores it in @phy_id and returns
+ *   zero on success.
+ *
+ *   In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
+ *   its return value is in turn returned.
+ *
+ */
+static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
+		      bool is_c45, struct phy_c45_device_ids *c45_ids)
+{
+	int phy_reg;
+
+	if (is_c45)
+		return get_phy_c45_ids(bus, addr, phy_id, c45_ids);
+
+	/* Grab the bits from PHYIR1, and put them in the upper half */
+	phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
+	if (phy_reg < 0)
+		return -EIO;
+
+	*phy_id = (phy_reg & 0xffff) << 16;
+
+	/* Grab the bits from PHYIR2, and put them in the lower half */
+	phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
+	if (phy_reg < 0)
+		return -EIO;
+
+	*phy_id |= (phy_reg & 0xffff);
+
+	return 0;
+}
+
+/**
+ * get_phy_device - reads the specified PHY device and returns its @phy_device
+ *		    struct
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ * @is_c45: If true the PHY uses the 802.3 clause 45 protocol
+ *
+ * Description: Reads the ID registers of the PHY at @addr on the
+ *   @bus, then allocates and returns the phy_device to represent it.
+ */
+struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
+{
+	struct phy_c45_device_ids c45_ids = {0};
+	u32 phy_id = 0;
+	int r;
+
+	r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids);
+	if (r)
+		return ERR_PTR(r);
+
+	/* If the phy_id is mostly Fs, there is no device there */
+	if ((phy_id & 0x1fffffff) == 0x1fffffff)
+		return NULL;
+
+	return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
+}
+EXPORT_SYMBOL(get_phy_device);
+
+/**
+ * phy_device_register - Register the phy device on the MDIO bus
+ * @phydev: phy_device structure to be added to the MDIO bus
+ */
+int phy_device_register(struct phy_device *phydev)
+{
+	int err;
+
+	/* Don't register a phy if one is already registered at this address */
+	if (phydev->bus->phy_map[phydev->addr])
+		return -EINVAL;
+	phydev->bus->phy_map[phydev->addr] = phydev;
+
+	/* Run all of the fixups for this PHY */
+	err = phy_scan_fixups(phydev);
+	if (err) {
+		pr_err("PHY %d failed to initialize\n", phydev->addr);
+		goto out;
+	}
+
+	err = device_add(&phydev->dev);
+	if (err) {
+		pr_err("PHY %d failed to add\n", phydev->addr);
+		goto out;
+	}
+
+	return 0;
+
+ out:
+	phydev->bus->phy_map[phydev->addr] = NULL;
+	return err;
+}
+EXPORT_SYMBOL(phy_device_register);
+
+/**
+ * phy_find_first - finds the first PHY device on the bus
+ * @bus: the target MII bus
+ */
+struct phy_device *phy_find_first(struct mii_bus *bus)
+{
+	int addr;
+
+	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
+		if (bus->phy_map[addr])
+			return bus->phy_map[addr];
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(phy_find_first);
+
+/**
+ * phy_prepare_link - prepares the PHY layer to monitor link status
+ * @phydev: target phy_device struct
+ * @handler: callback function for link status change notifications
+ *
+ * Description: Tells the PHY infrastructure to handle the
+ *   gory details on monitoring link status (whether through
+ *   polling or an interrupt), and to call back to the
+ *   connected device driver when the link status changes.
+ *   If you want to monitor your own link state, don't call
+ *   this function.
+ */
+static void phy_prepare_link(struct phy_device *phydev,
+			     void (*handler)(struct net_device *))
+{
+	phydev->adjust_link = handler;
+}
+
+/**
+ * phy_connect_direct - connect an ethernet device to a specific phy_device
+ * @dev: the network device to connect
+ * @phydev: the pointer to the phy device
+ * @handler: callback function for state change notifications
+ * @interface: PHY device's interface
+ */
+int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
+		       void (*handler)(struct net_device *),
+		       phy_interface_t interface)
+{
+	int rc;
+
+	rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
+	if (rc)
+		return rc;
+
+	phy_prepare_link(phydev, handler);
+	phy_start_machine(phydev);
+	if (phydev->irq > 0)
+		phy_start_interrupts(phydev);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_connect_direct);
+
+/**
+ * phy_connect - connect an ethernet device to a PHY device
+ * @dev: the network device to connect
+ * @bus_id: the id string of the PHY device to connect
+ * @handler: callback function for state change notifications
+ * @interface: PHY device's interface
+ *
+ * Description: Convenience function for connecting ethernet
+ *   devices to PHY devices.  The default behavior is for
+ *   the PHY infrastructure to handle everything, and only notify
+ *   the connected driver when the link status changes.  If you
+ *   don't want, or can't use the provided functionality, you may
+ *   choose to call only the subset of functions which provide
+ *   the desired functionality.
+ */
+struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
+			       void (*handler)(struct net_device *),
+			       phy_interface_t interface)
+{
+	struct phy_device *phydev;
+	struct device *d;
+	int rc;
+
+	/* Search the list of PHY devices on the mdio bus for the
+	 * PHY with the requested name
+	 */
+	d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
+	if (!d) {
+		pr_err("PHY %s not found\n", bus_id);
+		return ERR_PTR(-ENODEV);
+	}
+	phydev = to_phy_device(d);
+
+	rc = phy_connect_direct(dev, phydev, handler, interface);
+	if (rc)
+		return ERR_PTR(rc);
+
+	return phydev;
+}
+EXPORT_SYMBOL(phy_connect);
+
+/**
+ * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
+ *		    device
+ * @phydev: target phy_device struct
+ */
+void phy_disconnect(struct phy_device *phydev)
+{
+	if (phydev->irq > 0)
+		phy_stop_interrupts(phydev);
+
+	phy_stop_machine(phydev);
+
+	phydev->adjust_link = NULL;
+
+	phy_detach(phydev);
+}
+EXPORT_SYMBOL(phy_disconnect);
+
+/**
+ * phy_poll_reset - Safely wait until a PHY reset has properly completed
+ * @phydev: The PHY device to poll
+ *
+ * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
+ *   published in 2008, a PHY reset may take up to 0.5 seconds.  The MII BMCR
+ *   register must be polled until the BMCR_RESET bit clears.
+ *
+ *   Furthermore, any attempts to write to PHY registers may have no effect
+ *   or even generate MDIO bus errors until this is complete.
+ *
+ *   Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
+ *   standard and do not fully reset after the BMCR_RESET bit is set, and may
+ *   even *REQUIRE* a soft-reset to properly restart autonegotiation.  In an
+ *   effort to support such broken PHYs, this function is separate from the
+ *   standard phy_init_hw() which will zero all the other bits in the BMCR
+ *   and reapply all driver-specific and board-specific fixups.
+ */
+static int phy_poll_reset(struct phy_device *phydev)
+{
+	/* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
+	unsigned int retries = 12;
+	int ret;
+
+	do {
+		msleep(50);
+		ret = phy_read(phydev, MII_BMCR);
+		if (ret < 0)
+			return ret;
+	} while (ret & BMCR_RESET && --retries);
+	if (ret & BMCR_RESET)
+		return -ETIMEDOUT;
+
+	/* Some chips (smsc911x) may still need up to another 1ms after the
+	 * BMCR_RESET bit is cleared before they are usable.
+	 */
+	msleep(1);
+	return 0;
+}
+
+int phy_init_hw(struct phy_device *phydev)
+{
+	int ret = 0;
+
+	if (!phydev->drv || !phydev->drv->config_init)
+		return 0;
+
+	if (phydev->drv->soft_reset)
+		ret = phydev->drv->soft_reset(phydev);
+	else
+		ret = genphy_soft_reset(phydev);
+
+	if (ret < 0)
+		return ret;
+
+	ret = phy_scan_fixups(phydev);
+	if (ret < 0)
+		return ret;
+
+	return phydev->drv->config_init(phydev);
+}
+EXPORT_SYMBOL(phy_init_hw);
+
+/**
+ * phy_attach_direct - attach a network device to a given PHY device pointer
+ * @dev: network device to attach
+ * @phydev: Pointer to phy_device to attach
+ * @flags: PHY device's dev_flags
+ * @interface: PHY device's interface
+ *
+ * Description: Called by drivers to attach to a particular PHY
+ *     device. The phy_device is found, and properly hooked up
+ *     to the phy_driver.  If no driver is attached, then a
+ *     generic driver is used.  The phy_device is given a ptr to
+ *     the attaching device, and given a callback for link status
+ *     change.  The phy_device is returned to the attaching driver.
+ */
+int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
+		      u32 flags, phy_interface_t interface)
+{
+	struct device *d = &phydev->dev;
+	struct module *bus_module;
+	int err;
+
+	/* Assume that if there is no driver, that it doesn't
+	 * exist, and we should use the genphy driver.
+	 */
+	if (NULL == d->driver) {
+		if (phydev->is_c45)
+			d->driver = &genphy_driver[GENPHY_DRV_10G].driver;
+		else
+			d->driver = &genphy_driver[GENPHY_DRV_1G].driver;
+
+		err = d->driver->probe(d);
+		if (err >= 0)
+			err = device_bind_driver(d);
+
+		if (err)
+			return err;
+	}
+
+	if (phydev->attached_dev) {
+		dev_err(&dev->dev, "PHY already attached\n");
+		return -EBUSY;
+	}
+
+	/* Increment the bus module reference count */
+	bus_module = phydev->bus->dev.driver ?
+		     phydev->bus->dev.driver->owner : NULL;
+	if (!try_module_get(bus_module)) {
+		dev_err(&dev->dev, "failed to get the bus module\n");
+		return -EIO;
+	}
+
+	phydev->attached_dev = dev;
+	dev->phydev = phydev;
+
+	phydev->dev_flags = flags;
+
+	phydev->interface = interface;
+
+	phydev->state = PHY_READY;
+
+	/* Do initial configuration here, now that
+	 * we have certain key parameters
+	 * (dev_flags and interface)
+	 */
+	err = phy_init_hw(phydev);
+	if (err)
+		phy_detach(phydev);
+	else
+		phy_resume(phydev);
+
+	return err;
+}
+EXPORT_SYMBOL(phy_attach_direct);
+
+/**
+ * phy_attach - attach a network device to a particular PHY device
+ * @dev: network device to attach
+ * @bus_id: Bus ID of PHY device to attach
+ * @interface: PHY device's interface
+ *
+ * Description: Same as phy_attach_direct() except that a PHY bus_id
+ *     string is passed instead of a pointer to a struct phy_device.
+ */
+struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
+			      phy_interface_t interface)
+{
+	struct bus_type *bus = &mdio_bus_type;
+	struct phy_device *phydev;
+	struct device *d;
+	int rc;
+
+	/* Search the list of PHY devices on the mdio bus for the
+	 * PHY with the requested name
+	 */
+	d = bus_find_device_by_name(bus, NULL, bus_id);
+	if (!d) {
+		pr_err("PHY %s not found\n", bus_id);
+		return ERR_PTR(-ENODEV);
+	}
+	phydev = to_phy_device(d);
+
+	rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
+	if (rc)
+		return ERR_PTR(rc);
+
+	return phydev;
+}
+EXPORT_SYMBOL(phy_attach);
+
+/**
+ * phy_detach - detach a PHY device from its network device
+ * @phydev: target phy_device struct
+ */
+void phy_detach(struct phy_device *phydev)
+{
+	int i;
+
+	if (phydev->bus->dev.driver)
+		module_put(phydev->bus->dev.driver->owner);
+
+	phydev->attached_dev->phydev = NULL;
+	phydev->attached_dev = NULL;
+	phy_suspend(phydev);
+
+	/* If the device had no specific driver before (i.e. - it
+	 * was using the generic driver), we unbind the device
+	 * from the generic driver so that there's a chance a
+	 * real driver could be loaded
+	 */
+	for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) {
+		if (phydev->dev.driver == &genphy_driver[i].driver) {
+			device_release_driver(&phydev->dev);
+			break;
+		}
+	}
+}
+EXPORT_SYMBOL(phy_detach);
+
+int phy_suspend(struct phy_device *phydev)
+{
+	struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
+	struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
+	int ret = 0;
+
+	/* If the device has WOL enabled, we cannot suspend the PHY */
+	phy_ethtool_get_wol(phydev, &wol);
+	if (wol.wolopts)
+		return -EBUSY;
+
+	if (phydrv->suspend)
+		ret = phydrv->suspend(phydev);
+
+	if (ret)
+		return ret;
+
+	phydev->suspended = true;
+
+	return ret;
+}
+EXPORT_SYMBOL(phy_suspend);
+
+int phy_resume(struct phy_device *phydev)
+{
+	struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
+	int ret = 0;
+
+	if (phydrv->resume)
+		ret = phydrv->resume(phydev);
+
+	if (ret)
+		return ret;
+
+	phydev->suspended = false;
+
+	return ret;
+}
+EXPORT_SYMBOL(phy_resume);
+
+/* Generic PHY support and helper functions */
+
+/**
+ * genphy_config_advert - sanitize and advertise auto-negotiation parameters
+ * @phydev: target phy_device struct
+ *
+ * Description: Writes MII_ADVERTISE with the appropriate values,
+ *   after sanitizing the values to make sure we only advertise
+ *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
+ *   hasn't changed, and > 0 if it has changed.
+ */
+static int genphy_config_advert(struct phy_device *phydev)
+{
+	u32 advertise;
+	int oldadv, adv, bmsr;
+	int err, changed = 0;
+
+	/* Only allow advertising what this PHY supports */
+	phydev->advertising &= phydev->supported;
+	advertise = phydev->advertising;
+
+	/* Setup standard advertisement */
+	adv = phy_read(phydev, MII_ADVERTISE);
+	if (adv < 0)
+		return adv;
+
+	oldadv = adv;
+	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
+		 ADVERTISE_PAUSE_ASYM);
+	adv |= ethtool_adv_to_mii_adv_t(advertise);
+
+	if (adv != oldadv) {
+		err = phy_write(phydev, MII_ADVERTISE, adv);
+
+		if (err < 0)
+			return err;
+		changed = 1;
+	}
+
+	bmsr = phy_read(phydev, MII_BMSR);
+	if (bmsr < 0)
+		return bmsr;
+
+	/* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
+	 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
+	 * logical 1.
+	 */
+	if (!(bmsr & BMSR_ESTATEN))
+		return changed;
+
+	/* Configure gigabit if it's supported */
+	adv = phy_read(phydev, MII_CTRL1000);
+	if (adv < 0)
+		return adv;
+
+	oldadv = adv;
+	adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
+
+	if (phydev->supported & (SUPPORTED_1000baseT_Half |
+				 SUPPORTED_1000baseT_Full)) {
+		adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
+	}
+
+	if (adv != oldadv)
+		changed = 1;
+
+	err = phy_write(phydev, MII_CTRL1000, adv);
+	if (err < 0)
+		return err;
+
+	return changed;
+}
+
+/**
+ * genphy_setup_forced - configures/forces speed/duplex from @phydev
+ * @phydev: target phy_device struct
+ *
+ * Description: Configures MII_BMCR to force speed/duplex
+ *   to the values in phydev. Assumes that the values are valid.
+ *   Please see phy_sanitize_settings().
+ */
+int genphy_setup_forced(struct phy_device *phydev)
+{
+	int ctl = 0;
+
+	phydev->pause = 0;
+	phydev->asym_pause = 0;
+
+	if (SPEED_1000 == phydev->speed)
+		ctl |= BMCR_SPEED1000;
+	else if (SPEED_100 == phydev->speed)
+		ctl |= BMCR_SPEED100;
+
+	if (DUPLEX_FULL == phydev->duplex)
+		ctl |= BMCR_FULLDPLX;
+
+	return phy_write(phydev, MII_BMCR, ctl);
+}
+EXPORT_SYMBOL(genphy_setup_forced);
+
+/**
+ * genphy_restart_aneg - Enable and Restart Autonegotiation
+ * @phydev: target phy_device struct
+ */
+int genphy_restart_aneg(struct phy_device *phydev)
+{
+	int ctl = phy_read(phydev, MII_BMCR);
+
+	if (ctl < 0)
+		return ctl;
+
+	ctl |= BMCR_ANENABLE | BMCR_ANRESTART;
+
+	/* Don't isolate the PHY if we're negotiating */
+	ctl &= ~BMCR_ISOLATE;
+
+	return phy_write(phydev, MII_BMCR, ctl);
+}
+EXPORT_SYMBOL(genphy_restart_aneg);
+
+/**
+ * genphy_config_aneg - restart auto-negotiation or write BMCR
+ * @phydev: target phy_device struct
+ *
+ * Description: If auto-negotiation is enabled, we configure the
+ *   advertising, and then restart auto-negotiation.  If it is not
+ *   enabled, then we write the BMCR.
+ */
+int genphy_config_aneg(struct phy_device *phydev)
+{
+	int result;
+
+	if (AUTONEG_ENABLE != phydev->autoneg)
+		return genphy_setup_forced(phydev);
+
+	result = genphy_config_advert(phydev);
+	if (result < 0) /* error */
+		return result;
+	if (result == 0) {
+		/* Advertisement hasn't changed, but maybe aneg was never on to
+		 * begin with?  Or maybe phy was isolated?
+		 */
+		int ctl = phy_read(phydev, MII_BMCR);
+
+		if (ctl < 0)
+			return ctl;
+
+		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
+			result = 1; /* do restart aneg */
+	}
+
+	/* Only restart aneg if we are advertising something different
+	 * than we were before.
+	 */
+	if (result > 0)
+		result = genphy_restart_aneg(phydev);
+
+	return result;
+}
+EXPORT_SYMBOL(genphy_config_aneg);
+
+/**
+ * genphy_aneg_done - return auto-negotiation status
+ * @phydev: target phy_device struct
+ *
+ * Description: Reads the status register and returns 0 either if
+ *   auto-negotiation is incomplete, or if there was an error.
+ *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
+ */
+int genphy_aneg_done(struct phy_device *phydev)
+{
+	int retval = phy_read(phydev, MII_BMSR);
+
+	return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
+}
+EXPORT_SYMBOL(genphy_aneg_done);
+
+static int gen10g_config_aneg(struct phy_device *phydev)
+{
+	return 0;
+}
+
+/**
+ * genphy_update_link - update link status in @phydev
+ * @phydev: target phy_device struct
+ *
+ * Description: Update the value in phydev->link to reflect the
+ *   current link value.  In order to do this, we need to read
+ *   the status register twice, keeping the second value.
+ */
+int genphy_update_link(struct phy_device *phydev)
+{
+	int status;
+
+	/* Do a fake read */
+	status = phy_read(phydev, MII_BMSR);
+	if (status < 0)
+		return status;
+
+	/* Read link and autonegotiation status */
+	status = phy_read(phydev, MII_BMSR);
+	if (status < 0)
+		return status;
+
+	if ((status & BMSR_LSTATUS) == 0)
+		phydev->link = 0;
+	else
+		phydev->link = 1;
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_update_link);
+
+/**
+ * genphy_read_status - check the link status and update current link state
+ * @phydev: target phy_device struct
+ *
+ * Description: Check the link, then figure out the current state
+ *   by comparing what we advertise with what the link partner
+ *   advertises.  Start by checking the gigabit possibilities,
+ *   then move on to 10/100.
+ */
+int genphy_read_status(struct phy_device *phydev)
+{
+	int adv;
+	int err;
+	int lpa;
+	int lpagb = 0;
+	int common_adv;
+	int common_adv_gb = 0;
+
+	/* Update the link, but return if there was an error */
+	err = genphy_update_link(phydev);
+	if (err)
+		return err;
+
+	phydev->lp_advertising = 0;
+
+	if (AUTONEG_ENABLE == phydev->autoneg) {
+		if (phydev->supported & (SUPPORTED_1000baseT_Half
+					| SUPPORTED_1000baseT_Full)) {
+			lpagb = phy_read(phydev, MII_STAT1000);
+			if (lpagb < 0)
+				return lpagb;
+
+			adv = phy_read(phydev, MII_CTRL1000);
+			if (adv < 0)
+				return adv;
+
+			phydev->lp_advertising =
+				mii_stat1000_to_ethtool_lpa_t(lpagb);
+			common_adv_gb = lpagb & adv << 2;
+		}
+
+		lpa = phy_read(phydev, MII_LPA);
+		if (lpa < 0)
+			return lpa;
+
+		phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa);
+
+		adv = phy_read(phydev, MII_ADVERTISE);
+		if (adv < 0)
+			return adv;
+
+		common_adv = lpa & adv;
+
+		phydev->speed = SPEED_10;
+		phydev->duplex = DUPLEX_HALF;
+		phydev->pause = 0;
+		phydev->asym_pause = 0;
+
+		if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) {
+			phydev->speed = SPEED_1000;
+
+			if (common_adv_gb & LPA_1000FULL)
+				phydev->duplex = DUPLEX_FULL;
+		} else if (common_adv & (LPA_100FULL | LPA_100HALF)) {
+			phydev->speed = SPEED_100;
+
+			if (common_adv & LPA_100FULL)
+				phydev->duplex = DUPLEX_FULL;
+		} else
+			if (common_adv & LPA_10FULL)
+				phydev->duplex = DUPLEX_FULL;
+
+		if (phydev->duplex == DUPLEX_FULL) {
+			phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
+			phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
+		}
+	} else {
+		int bmcr = phy_read(phydev, MII_BMCR);
+
+		if (bmcr < 0)
+			return bmcr;
+
+		if (bmcr & BMCR_FULLDPLX)
+			phydev->duplex = DUPLEX_FULL;
+		else
+			phydev->duplex = DUPLEX_HALF;
+
+		if (bmcr & BMCR_SPEED1000)
+			phydev->speed = SPEED_1000;
+		else if (bmcr & BMCR_SPEED100)
+			phydev->speed = SPEED_100;
+		else
+			phydev->speed = SPEED_10;
+
+		phydev->pause = 0;
+		phydev->asym_pause = 0;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_read_status);
+
+static int gen10g_read_status(struct phy_device *phydev)
+{
+	int devad, reg;
+	u32 mmd_mask = phydev->c45_ids.devices_in_package;
+
+	phydev->link = 1;
+
+	/* For now just lie and say it's 10G all the time */
+	phydev->speed = SPEED_10000;
+	phydev->duplex = DUPLEX_FULL;
+
+	for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) {
+		if (!(mmd_mask & 1))
+			continue;
+
+		/* Read twice because link state is latched and a
+		 * read moves the current state into the register
+		 */
+		phy_read_mmd(phydev, devad, MDIO_STAT1);
+		reg = phy_read_mmd(phydev, devad, MDIO_STAT1);
+		if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
+			phydev->link = 0;
+	}
+
+	return 0;
+}
+
+/**
+ * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
+ * @phydev: target phy_device struct
+ *
+ * Description: Perform a software PHY reset using the standard
+ * BMCR_RESET bit and poll for the reset bit to be cleared.
+ *
+ * Returns: 0 on success, < 0 on failure
+ */
+int genphy_soft_reset(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
+	if (ret < 0)
+		return ret;
+
+	return phy_poll_reset(phydev);
+}
+EXPORT_SYMBOL(genphy_soft_reset);
+
+int genphy_config_init(struct phy_device *phydev)
+{
+	int val;
+	u32 features;
+
+	features = (SUPPORTED_TP | SUPPORTED_MII
+			| SUPPORTED_AUI | SUPPORTED_FIBRE |
+			SUPPORTED_BNC);
+
+	/* Do we support autonegotiation? */
+	val = phy_read(phydev, MII_BMSR);
+	if (val < 0)
+		return val;
+
+	if (val & BMSR_ANEGCAPABLE)
+		features |= SUPPORTED_Autoneg;
+
+	if (val & BMSR_100FULL)
+		features |= SUPPORTED_100baseT_Full;
+	if (val & BMSR_100HALF)
+		features |= SUPPORTED_100baseT_Half;
+	if (val & BMSR_10FULL)
+		features |= SUPPORTED_10baseT_Full;
+	if (val & BMSR_10HALF)
+		features |= SUPPORTED_10baseT_Half;
+
+	if (val & BMSR_ESTATEN) {
+		val = phy_read(phydev, MII_ESTATUS);
+		if (val < 0)
+			return val;
+
+		if (val & ESTATUS_1000_TFULL)
+			features |= SUPPORTED_1000baseT_Full;
+		if (val & ESTATUS_1000_THALF)
+			features |= SUPPORTED_1000baseT_Half;
+	}
+
+	phydev->supported &= features;
+	phydev->advertising &= features;
+
+	return 0;
+}
+
+static int gen10g_soft_reset(struct phy_device *phydev)
+{
+	/* Do nothing for now */
+	return 0;
+}
+EXPORT_SYMBOL(genphy_config_init);
+
+static int gen10g_config_init(struct phy_device *phydev)
+{
+	/* Temporarily just say we support everything */
+	phydev->supported = SUPPORTED_10000baseT_Full;
+	phydev->advertising = SUPPORTED_10000baseT_Full;
+
+	return 0;
+}
+
+int genphy_suspend(struct phy_device *phydev)
+{
+	int value;
+
+	mutex_lock(&phydev->lock);
+
+	value = phy_read(phydev, MII_BMCR);
+	phy_write(phydev, MII_BMCR, value | BMCR_PDOWN);
+
+	mutex_unlock(&phydev->lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_suspend);
+
+static int gen10g_suspend(struct phy_device *phydev)
+{
+	return 0;
+}
+
+int genphy_resume(struct phy_device *phydev)
+{
+	int value;
+
+	mutex_lock(&phydev->lock);
+
+	value = phy_read(phydev, MII_BMCR);
+	phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN);
+
+	mutex_unlock(&phydev->lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_resume);
+
+static int gen10g_resume(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static void of_set_phy_supported(struct phy_device *phydev)
+{
+	struct device_node *node = phydev->dev.of_node;
+	u32 max_speed;
+
+	if (!IS_ENABLED(CONFIG_OF_MDIO))
+		return;
+
+	if (!node)
+		return;
+
+	if (!of_property_read_u32(node, "max-speed", &max_speed)) {
+		/* The default values for phydev->supported are provided by the PHY
+		 * driver "features" member, we want to reset to sane defaults fist
+		 * before supporting higher speeds.
+		 */
+		phydev->supported &= PHY_DEFAULT_FEATURES;
+
+		switch (max_speed) {
+		default:
+			return;
+
+		case SPEED_1000:
+			phydev->supported |= PHY_1000BT_FEATURES;
+		case SPEED_100:
+			phydev->supported |= PHY_100BT_FEATURES;
+		case SPEED_10:
+			phydev->supported |= PHY_10BT_FEATURES;
+		}
+	}
+}
+
+/**
+ * phy_probe - probe and init a PHY device
+ * @dev: device to probe and init
+ *
+ * Description: Take care of setting up the phy_device structure,
+ *   set the state to READY (the driver's init function should
+ *   set it to STARTING if needed).
+ */
+static int phy_probe(struct device *dev)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+	struct device_driver *drv = phydev->dev.driver;
+	struct phy_driver *phydrv = to_phy_driver(drv);
+	int err = 0;
+
+	phydev->drv = phydrv;
+
+	/* Disable the interrupt if the PHY doesn't support it
+	 * but the interrupt is still a valid one
+	 */
+	if (!(phydrv->flags & PHY_HAS_INTERRUPT) &&
+	    phy_interrupt_is_valid(phydev))
+		phydev->irq = PHY_POLL;
+
+	if (phydrv->flags & PHY_IS_INTERNAL)
+		phydev->is_internal = true;
+
+	mutex_lock(&phydev->lock);
+
+	/* Start out supporting everything. Eventually,
+	 * a controller will attach, and may modify one
+	 * or both of these values
+	 */
+	phydev->supported = phydrv->features;
+	of_set_phy_supported(phydev);
+	phydev->advertising = phydev->supported;
+
+	/* Set the state to READY by default */
+	phydev->state = PHY_READY;
+
+	if (phydev->drv->probe)
+		err = phydev->drv->probe(phydev);
+
+	mutex_unlock(&phydev->lock);
+
+	return err;
+}
+
+static int phy_remove(struct device *dev)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	mutex_lock(&phydev->lock);
+	phydev->state = PHY_DOWN;
+	mutex_unlock(&phydev->lock);
+
+	if (phydev->drv->remove)
+		phydev->drv->remove(phydev);
+	phydev->drv = NULL;
+
+	return 0;
+}
+
+/**
+ * phy_driver_register - register a phy_driver with the PHY layer
+ * @new_driver: new phy_driver to register
+ */
+int phy_driver_register(struct phy_driver *new_driver)
+{
+	int retval;
+
+	new_driver->driver.name = new_driver->name;
+	new_driver->driver.bus = &mdio_bus_type;
+	new_driver->driver.probe = phy_probe;
+	new_driver->driver.remove = phy_remove;
+
+	retval = driver_register(&new_driver->driver);
+	if (retval) {
+		pr_err("%s: Error %d in registering driver\n",
+		       new_driver->name, retval);
+
+		return retval;
+	}
+
+	pr_debug("%s: Registered new driver\n", new_driver->name);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_driver_register);
+
+int phy_drivers_register(struct phy_driver *new_driver, int n)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < n; i++) {
+		ret = phy_driver_register(new_driver + i);
+		if (ret) {
+			while (i-- > 0)
+				phy_driver_unregister(new_driver + i);
+			break;
+		}
+	}
+	return ret;
+}
+EXPORT_SYMBOL(phy_drivers_register);
+
+void phy_driver_unregister(struct phy_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(phy_driver_unregister);
+
+void phy_drivers_unregister(struct phy_driver *drv, int n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		phy_driver_unregister(drv + i);
+}
+EXPORT_SYMBOL(phy_drivers_unregister);
+
+static struct phy_driver genphy_driver[] = {
+{
+	.phy_id		= 0xffffffff,
+	.phy_id_mask	= 0xffffffff,
+	.name		= "Generic PHY",
+	.soft_reset	= genphy_soft_reset,
+	.config_init	= genphy_config_init,
+	.features	= PHY_GBIT_FEATURES | SUPPORTED_MII |
+			  SUPPORTED_AUI | SUPPORTED_FIBRE |
+			  SUPPORTED_BNC,
+	.config_aneg	= genphy_config_aneg,
+	.aneg_done	= genphy_aneg_done,
+	.read_status	= genphy_read_status,
+	.suspend	= genphy_suspend,
+	.resume		= genphy_resume,
+	.driver		= { .owner = THIS_MODULE, },
+}, {
+	.phy_id         = 0xffffffff,
+	.phy_id_mask    = 0xffffffff,
+	.name           = "Generic 10G PHY",
+	.soft_reset	= gen10g_soft_reset,
+	.config_init    = gen10g_config_init,
+	.features       = 0,
+	.config_aneg    = gen10g_config_aneg,
+	.read_status    = gen10g_read_status,
+	.suspend        = gen10g_suspend,
+	.resume         = gen10g_resume,
+	.driver         = {.owner = THIS_MODULE, },
+} };
+
+static int __init phy_init(void)
+{
+	int rc;
+
+	rc = mdio_bus_init();
+	if (rc)
+		return rc;
+
+	rc = phy_drivers_register(genphy_driver,
+				  ARRAY_SIZE(genphy_driver));
+	if (rc)
+		mdio_bus_exit();
+
+	return rc;
+}
+
+static void __exit phy_exit(void)
+{
+	phy_drivers_unregister(genphy_driver,
+			       ARRAY_SIZE(genphy_driver));
+	mdio_bus_exit();
+}
+
+subsys_initcall(phy_init);
+module_exit(phy_exit);