Initial import

1 files changed, 612 insertions, 0 deletions

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
new file mode 100644
index 000000000..095ef3fe3
--- /dev/null
+++ b/drivers/net/phy/mdio_bus.c
@@ -0,0 +1,612 @@
+/* MDIO Bus interface
+ *
+ * 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/device.h>
+#include <linux/of_device.h>
+#include <linux/of_mdio.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <asm/irq.h>
+
+/**
+ * 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;
+
+	/* 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) {
+		bus->state = MDIOBUS_ALLOCATED;
+		if (size)
+			bus->priv = (void *)bus + aligned_size;
+	}
+
+	return bus;
+}
+EXPORT_SYMBOL(mdiobus_alloc_size);
+
+static void _devm_mdiobus_free(struct device *dev, void *res)
+{
+	mdiobus_free(*(struct mii_bus **)res);
+}
+
+static int devm_mdiobus_match(struct device *dev, void *res, void *data)
+{
+	struct mii_bus **r = res;
+
+	if (WARN_ON(!r || !*r))
+		return 0;
+
+	return *r == data;
+}
+
+/**
+ * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size()
+ * @dev:		Device to allocate mii_bus for
+ * @sizeof_priv:	Space to allocate for private structure.
+ *
+ * Managed mdiobus_alloc_size. mii_bus allocated with this function is
+ * automatically freed on driver detach.
+ *
+ * If an mii_bus allocated with this function needs to be freed separately,
+ * devm_mdiobus_free() must be used.
+ *
+ * RETURNS:
+ * Pointer to allocated mii_bus on success, NULL on failure.
+ */
+struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv)
+{
+	struct mii_bus **ptr, *bus;
+
+	ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	/* use raw alloc_dr for kmalloc caller tracing */
+	bus = mdiobus_alloc_size(sizeof_priv);
+	if (bus) {
+		*ptr = bus;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return bus;
+}
+EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size);
+
+/**
+ * devm_mdiobus_free - Resource-managed mdiobus_free()
+ * @dev:		Device this mii_bus belongs to
+ * @bus:		the mii_bus associated with the device
+ *
+ * Free mii_bus allocated with devm_mdiobus_alloc_size().
+ */
+void devm_mdiobus_free(struct device *dev, struct mii_bus *bus)
+{
+	int rc;
+
+	rc = devres_release(dev, _devm_mdiobus_free,
+			    devm_mdiobus_match, bus);
+	WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_mdiobus_free);
+
+/**
+ * mdiobus_release - mii_bus device release callback
+ * @d: the target struct device that contains the mii_bus
+ *
+ * Description: called when the last reference to an mii_bus is
+ * dropped, to free the underlying memory.
+ */
+static void mdiobus_release(struct device *d)
+{
+	struct mii_bus *bus = to_mii_bus(d);
+	BUG_ON(bus->state != MDIOBUS_RELEASED &&
+	       /* for compatibility with error handling in drivers */
+	       bus->state != MDIOBUS_ALLOCATED);
+	kfree(bus);
+}
+
+static struct class mdio_bus_class = {
+	.name		= "mdio_bus",
+	.dev_release	= mdiobus_release,
+};
+
+#if IS_ENABLED(CONFIG_OF_MDIO)
+/* Helper function for of_mdio_find_bus */
+static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np)
+{
+	return dev->of_node == mdio_bus_np;
+}
+/**
+ * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
+ * @mdio_bus_np: Pointer to the mii_bus.
+ *
+ * Returns a pointer to the mii_bus, or NULL if none found.
+ *
+ * Because the association of a device_node and mii_bus is made via
+ * of_mdiobus_register(), the mii_bus cannot be found before it is
+ * registered with of_mdiobus_register().
+ *
+ */
+struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
+{
+	struct device *d;
+
+	if (!mdio_bus_np)
+		return NULL;
+
+	d = class_find_device(&mdio_bus_class, NULL,  mdio_bus_np,
+			      of_mdio_bus_match);
+
+	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
+ * phy's address with its 'reg' property. If found, set the of_node pointer for
+ * the phy. This allows auto-probed pyh devices to be supplied with information
+ * passed in via DT.
+ */
+static void of_mdiobus_link_phydev(struct mii_bus *mdio,
+				   struct phy_device *phydev)
+{
+	struct device *dev = &phydev->dev;
+	struct device_node *child;
+
+	if (dev->of_node || !mdio->dev.of_node)
+		return;
+
+	for_each_available_child_of_node(mdio->dev.of_node, child) {
+		int addr;
+		int ret;
+
+		ret = of_property_read_u32(child, "reg", &addr);
+		if (ret < 0) {
+			dev_err(dev, "%s has invalid PHY address\n",
+				child->full_name);
+			continue;
+		}
+
+		/* A PHY must have a reg property in the range [0-31] */
+		if (addr >= PHY_MAX_ADDR) {
+			dev_err(dev, "%s PHY address %i is too large\n",
+				child->full_name, addr);
+			continue;
+		}
+
+		if (addr == phydev->addr) {
+			dev->of_node = child;
+			return;
+		}
+	}
+}
+#else /* !IS_ENABLED(CONFIG_OF_MDIO) */
+static inline void of_mdiobus_link_phydev(struct mii_bus *mdio,
+					  struct phy_device *phydev)
+{
+}
+#endif
+
+/**
+ * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
+ * @bus: target mii_bus
+ *
+ * Description: Called by a bus driver to bring up all the PHYs
+ *   on a given bus, and attach them to the bus.
+ *
+ * Returns 0 on success or < 0 on error.
+ */
+int mdiobus_register(struct mii_bus *bus)
+{
+	int i, err;
+
+	if (NULL == bus || NULL == bus->name ||
+	    NULL == bus->read || NULL == bus->write)
+		return -EINVAL;
+
+	BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
+	       bus->state != MDIOBUS_UNREGISTERED);
+
+	bus->dev.parent = bus->parent;
+	bus->dev.class = &mdio_bus_class;
+	bus->dev.groups = NULL;
+	dev_set_name(&bus->dev, "%s", bus->id);
+
+	err = device_register(&bus->dev);
+	if (err) {
+		pr_err("mii_bus %s failed to register\n", bus->id);
+		put_device(&bus->dev);
+		return -EINVAL;
+	}
+
+	mutex_init(&bus->mdio_lock);
+
+	if (bus->reset)
+		bus->reset(bus);
+
+	for (i = 0; i < PHY_MAX_ADDR; i++) {
+		if ((bus->phy_mask & (1 << i)) == 0) {
+			struct phy_device *phydev;
+
+			phydev = mdiobus_scan(bus, i);
+			if (IS_ERR(phydev)) {
+				err = PTR_ERR(phydev);
+				goto error;
+			}
+		}
+	}
+
+	bus->state = MDIOBUS_REGISTERED;
+	pr_info("%s: probed\n", bus->name);
+	return 0;
+
+error:
+	while (--i >= 0) {
+		if (bus->phy_map[i])
+			device_unregister(&bus->phy_map[i]->dev);
+	}
+	device_del(&bus->dev);
+	return err;
+}
+EXPORT_SYMBOL(mdiobus_register);
+
+void mdiobus_unregister(struct mii_bus *bus)
+{
+	int i;
+
+	BUG_ON(bus->state != MDIOBUS_REGISTERED);
+	bus->state = MDIOBUS_UNREGISTERED;
+
+	device_del(&bus->dev);
+	for (i = 0; i < PHY_MAX_ADDR; i++) {
+		if (bus->phy_map[i])
+			device_unregister(&bus->phy_map[i]->dev);
+		bus->phy_map[i] = NULL;
+	}
+}
+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;
+	}
+
+	BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
+	bus->state = MDIOBUS_RELEASED;
+
+	put_device(&bus->dev);
+}
+EXPORT_SYMBOL(mdiobus_free);
+
+struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
+{
+	struct phy_device *phydev;
+	int err;
+
+	phydev = get_phy_device(bus, addr, false);
+	if (IS_ERR(phydev) || phydev == NULL)
+		return phydev;
+
+	/*
+	 * For DT, see if the auto-probed phy has a correspoding child
+	 * in the bus node, and set the of_node pointer in this case.
+	 */
+	of_mdiobus_link_phydev(bus, phydev);
+
+	err = phy_device_register(phydev);
+	if (err) {
+		phy_device_free(phydev);
+		return NULL;
+	}
+
+	return phydev;
+}
+EXPORT_SYMBOL(mdiobus_scan);
+
+/**
+ * mdiobus_read - Convenience function for reading a given MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to read
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
+{
+	int retval;
+
+	BUG_ON(in_interrupt());
+
+	mutex_lock(&bus->mdio_lock);
+	retval = bus->read(bus, addr, regnum);
+	mutex_unlock(&bus->mdio_lock);
+
+	return retval;
+}
+EXPORT_SYMBOL(mdiobus_read);
+
+/**
+ * mdiobus_write - Convenience function for writing a given MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to write
+ * @val: value to write to @regnum
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
+{
+	int err;
+
+	BUG_ON(in_interrupt());
+
+	mutex_lock(&bus->mdio_lock);
+	err = bus->write(bus, addr, regnum, val);
+	mutex_unlock(&bus->mdio_lock);
+
+	return err;
+}
+EXPORT_SYMBOL(mdiobus_write);
+
+/**
+ * mdio_bus_match - determine if given PHY driver supports the given PHY device
+ * @dev: target PHY device
+ * @drv: given PHY driver
+ *
+ * Description: Given a PHY device, and a PHY driver, return 1 if
+ *   the driver supports the device.  Otherwise, return 0.
+ */
+static int mdio_bus_match(struct device *dev, struct device_driver *drv)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+	struct phy_driver *phydrv = to_phy_driver(drv);
+
+	if (of_driver_match_device(dev, drv))
+		return 1;
+
+	if (phydrv->match_phy_device)
+		return phydrv->match_phy_device(phydev);
+
+	return (phydrv->phy_id & phydrv->phy_id_mask) ==
+		(phydev->phy_id & phydrv->phy_id_mask);
+}
+
+#ifdef CONFIG_PM
+
+static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
+{
+	struct device_driver *drv = phydev->dev.driver;
+	struct phy_driver *phydrv = to_phy_driver(drv);
+	struct net_device *netdev = phydev->attached_dev;
+
+	if (!drv || !phydrv->suspend)
+		return false;
+
+	/* PHY not attached? May suspend if the PHY has not already been
+	 * suspended as part of a prior call to phy_disconnect() ->
+	 * phy_detach() -> phy_suspend() because the parent netdev might be the
+	 * MDIO bus driver and clock gated at this point.
+	 */
+	if (!netdev)
+		return !phydev->suspended;
+
+	/* Don't suspend PHY if the attched netdev parent may wakeup.
+	 * The parent may point to a PCI device, as in tg3 driver.
+	 */
+	if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
+		return false;
+
+	/* Also don't suspend PHY if the netdev itself may wakeup. This
+	 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
+	 * e.g. SoC devices.
+	 */
+	if (device_may_wakeup(&netdev->dev))
+		return false;
+
+	return true;
+}
+
+static int mdio_bus_suspend(struct device *dev)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	/* We must stop the state machine manually, otherwise it stops out of
+	 * control, possibly with the phydev->lock held. Upon resume, netdev
+	 * may call phy routines that try to grab the same lock, and that may
+	 * lead to a deadlock.
+	 */
+	if (phydev->attached_dev && phydev->adjust_link)
+		phy_stop_machine(phydev);
+
+	if (!mdio_bus_phy_may_suspend(phydev))
+		return 0;
+
+	return phy_suspend(phydev);
+}
+
+static int mdio_bus_resume(struct device *dev)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+	int ret;
+
+	if (!mdio_bus_phy_may_suspend(phydev))
+		goto no_resume;
+
+	ret = phy_resume(phydev);
+	if (ret < 0)
+		return ret;
+
+no_resume:
+	if (phydev->attached_dev && phydev->adjust_link)
+		phy_start_machine(phydev);
+
+	return 0;
+}
+
+static int mdio_bus_restore(struct device *dev)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+	struct net_device *netdev = phydev->attached_dev;
+	int ret;
+
+	if (!netdev)
+		return 0;
+
+	ret = phy_init_hw(phydev);
+	if (ret < 0)
+		return ret;
+
+	/* The PHY needs to renegotiate. */
+	phydev->link = 0;
+	phydev->state = PHY_UP;
+
+	phy_start_machine(phydev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops mdio_bus_pm_ops = {
+	.suspend = mdio_bus_suspend,
+	.resume = mdio_bus_resume,
+	.freeze = mdio_bus_suspend,
+	.thaw = mdio_bus_resume,
+	.restore = mdio_bus_restore,
+};
+
+#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
+
+#else
+
+#define MDIO_BUS_PM_OPS NULL
+
+#endif /* CONFIG_PM */
+
+static ssize_t
+phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
+}
+static DEVICE_ATTR_RO(phy_id);
+
+static ssize_t
+phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+	const char *mode = NULL;
+
+	if (phy_is_internal(phydev))
+		mode = "internal";
+	else
+		mode = phy_modes(phydev->interface);
+
+	return sprintf(buf, "%s\n", mode);
+}
+static DEVICE_ATTR_RO(phy_interface);
+
+static ssize_t
+phy_has_fixups_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	return sprintf(buf, "%d\n", phydev->has_fixups);
+}
+static DEVICE_ATTR_RO(phy_has_fixups);
+
+static struct attribute *mdio_dev_attrs[] = {
+	&dev_attr_phy_id.attr,
+	&dev_attr_phy_interface.attr,
+	&dev_attr_phy_has_fixups.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(mdio_dev);
+
+struct bus_type mdio_bus_type = {
+	.name		= "mdio_bus",
+	.match		= mdio_bus_match,
+	.pm		= MDIO_BUS_PM_OPS,
+	.dev_groups	= mdio_dev_groups,
+};
+EXPORT_SYMBOL(mdio_bus_type);
+
+int __init mdio_bus_init(void)
+{
+	int ret;
+
+	ret = class_register(&mdio_bus_class);
+	if (!ret) {
+		ret = bus_register(&mdio_bus_type);
+		if (ret)
+			class_unregister(&mdio_bus_class);
+	}
+
+	return ret;
+}
+
+void mdio_bus_exit(void)
+{
+	class_unregister(&mdio_bus_class);
+	bus_unregister(&mdio_bus_type);
+}