--- /dev/null
+/* 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);
Code Review / kvmfornfv.git / blobdiff