/spare/repo/netdev-2.6 branch 'ieee80211'

1 files changed, 871 insertions, 0 deletions

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
new file mode 100644
index 000000000000..d9e11f93bf3a
--- /dev/null
+++ b/drivers/net/phy/phy.c
@@ -0,0 +1,871 @@
+/*
+ * drivers/net/phy/phy.c
+ *
+ * Framework for configuring and reading PHY devices
+ * Based on code in sungem_phy.c and gianfar_phy.c
+ *
+ * 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.
+ *
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.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/spinlock.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+/* Convenience function to print out the current phy status
+ */
+void phy_print_status(struct phy_device *phydev)
+{
+        pr_info("%s: Link is %s", phydev->dev.bus_id,
+                        phydev->link ? "Up" : "Down");
+        if (phydev->link)
+                printk(" - %d/%s", phydev->speed,
+                                DUPLEX_FULL == phydev->duplex ?
+                                "Full" : "Half");
+
+        printk("\n");
+}
+EXPORT_SYMBOL(phy_print_status);
+
+
+/* Convenience functions for reading/writing a given PHY
+ * register. They MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation. */
+int phy_read(struct phy_device *phydev, u16 regnum)
+{
+        int retval;
+        struct mii_bus *bus = phydev->bus;
+
+        spin_lock_bh(&bus->mdio_lock);
+        retval = bus->read(bus, phydev->addr, regnum);
+        spin_unlock_bh(&bus->mdio_lock);
+
+        return retval;
+}
+EXPORT_SYMBOL(phy_read);
+
+int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
+{
+        int err;
+        struct mii_bus *bus = phydev->bus;
+
+        spin_lock_bh(&bus->mdio_lock);
+        err = bus->write(bus, phydev->addr, regnum, val);
+        spin_unlock_bh(&bus->mdio_lock);
+
+        return err;
+}
+EXPORT_SYMBOL(phy_write);
+
+
+int phy_clear_interrupt(struct phy_device *phydev)
+{
+        int err = 0;
+
+        if (phydev->drv->ack_interrupt)
+                err = phydev->drv->ack_interrupt(phydev);
+
+        return err;
+}
+
+
+int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
+{
+        int err = 0;
+
+        phydev->interrupts = interrupts;
+        if (phydev->drv->config_intr)
+                err = phydev->drv->config_intr(phydev);
+
+        return err;
+}
+
+
+/* phy_aneg_done
+ *
+ * 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.
+ */
+static inline int phy_aneg_done(struct phy_device *phydev)
+{
+        int retval;
+
+        retval = phy_read(phydev, MII_BMSR);
+
+        return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
+}
+
+/* A structure for mapping a particular speed and duplex
+ * combination to a particular SUPPORTED and ADVERTISED value */
+struct phy_setting {
+        int speed;
+        int duplex;
+        u32 setting;
+};
+
+/* A mapping of all SUPPORTED settings to speed/duplex */
+static struct phy_setting settings[] = {
+        {
+                .speed = 10000,
+                .duplex = DUPLEX_FULL,
+                .setting = SUPPORTED_10000baseT_Full,
+        },
+        {
+                .speed = SPEED_1000,
+                .duplex = DUPLEX_FULL,
+                .setting = SUPPORTED_1000baseT_Full,
+        },
+        {
+                .speed = SPEED_1000,
+                .duplex = DUPLEX_HALF,
+                .setting = SUPPORTED_1000baseT_Half,
+        },
+        {
+                .speed = SPEED_100,
+                .duplex = DUPLEX_FULL,
+                .setting = SUPPORTED_100baseT_Full,
+        },
+        {
+                .speed = SPEED_100,
+                .duplex = DUPLEX_HALF,
+                .setting = SUPPORTED_100baseT_Half,
+        },
+        {
+                .speed = SPEED_10,
+                .duplex = DUPLEX_FULL,
+                .setting = SUPPORTED_10baseT_Full,
+        },
+        {
+                .speed = SPEED_10,
+                .duplex = DUPLEX_HALF,
+                .setting = SUPPORTED_10baseT_Half,
+        },
+};
+
+#define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
+
+/* phy_find_setting
+ *
+ * description: Searches the settings array for the setting which
+ *   matches the desired speed and duplex, and returns the index
+ *   of that setting.  Returns the index of the last setting if
+ *   none of the others match.
+ */
+static inline int phy_find_setting(int speed, int duplex)
+{
+        int idx = 0;
+
+        while (idx < ARRAY_SIZE(settings) &&
+                        (settings[idx].speed != speed ||
+                        settings[idx].duplex != duplex))
+                idx++;
+
+        return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
+}
+
+/* phy_find_valid
+ * idx: The first index in settings[] to search
+ * features: A mask of the valid settings
+ *
+ * description: Returns the index of the first valid setting less
+ *   than or equal to the one pointed to by idx, as determined by
+ *   the mask in features.  Returns the index of the last setting
+ *   if nothing else matches.
+ */
+static inline int phy_find_valid(int idx, u32 features)
+{
+        while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
+                idx++;
+
+        return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
+}
+
+/* phy_sanitize_settings
+ *
+ * description: Make sure the PHY is set to supported speeds and
+ *   duplexes.  Drop down by one in this order:  1000/FULL,
+ *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
+ */
+void phy_sanitize_settings(struct phy_device *phydev)
+{
+        u32 features = phydev->supported;
+        int idx;
+
+        /* Sanitize settings based on PHY capabilities */
+        if ((features & SUPPORTED_Autoneg) == 0)
+                phydev->autoneg = 0;
+
+        idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
+                        features);
+
+        phydev->speed = settings[idx].speed;
+        phydev->duplex = settings[idx].duplex;
+}
+EXPORT_SYMBOL(phy_sanitize_settings);
+
+/* phy_ethtool_sset:
+ * A generic ethtool sset function.  Handles all the details
+ *
+ * A few notes about parameter checking:
+ * - We don't set port or transceiver, so we don't care what they
+ *   were set to.
+ * - phy_start_aneg() will make sure forced settings are sane, and
+ *   choose the next best ones from the ones selected, so we don't
+ *   care if ethtool tries to give us bad values
+ *
+ * A note about the PHYCONTROL Layer.  If you turn off
+ * CONFIG_PHYCONTROL, you will need to read the PHY status
+ * registers after this function completes, and update your
+ * controller manually.
+ */
+int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
+{
+        if (cmd->phy_address != phydev->addr)
+                return -EINVAL;
+
+        /* We make sure that we don't pass unsupported
+         * values in to the PHY */
+        cmd->advertising &= phydev->supported;
+
+        /* Verify the settings we care about. */
+        if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
+                return -EINVAL;
+
+        if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
+                return -EINVAL;
+
+        if (cmd->autoneg == AUTONEG_DISABLE
+                        && ((cmd->speed != SPEED_1000
+                                        && cmd->speed != SPEED_100
+                                        && cmd->speed != SPEED_10)
+                                || (cmd->duplex != DUPLEX_HALF
+                                        && cmd->duplex != DUPLEX_FULL)))
+                return -EINVAL;
+
+        phydev->autoneg = cmd->autoneg;
+
+        phydev->speed = cmd->speed;
+
+        phydev->advertising = cmd->advertising;
+
+        if (AUTONEG_ENABLE == cmd->autoneg)
+                phydev->advertising |= ADVERTISED_Autoneg;
+        else
+                phydev->advertising &= ~ADVERTISED_Autoneg;
+
+        phydev->duplex = cmd->duplex;
+
+        /* Restart the PHY */
+        phy_start_aneg(phydev);
+
+        return 0;
+}
+
+int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
+{
+        cmd->supported = phydev->supported;
+
+        cmd->advertising = phydev->advertising;
+
+        cmd->speed = phydev->speed;
+        cmd->duplex = phydev->duplex;
+        cmd->port = PORT_MII;
+        cmd->phy_address = phydev->addr;
+        cmd->transceiver = XCVR_EXTERNAL;
+        cmd->autoneg = phydev->autoneg;
+
+        return 0;
+}
+
+
+/* Note that this function is currently incompatible with the
+ * PHYCONTROL layer.  It changes registers without regard to
+ * current state.  Use at own risk
+ */
+int phy_mii_ioctl(struct phy_device *phydev,
+                struct mii_ioctl_data *mii_data, int cmd)
+{
+        u16 val = mii_data->val_in;
+
+        switch (cmd) {
+        case SIOCGMIIPHY:
+                mii_data->phy_id = phydev->addr;
+                break;
+        case SIOCGMIIREG:
+                mii_data->val_out = phy_read(phydev, mii_data->reg_num);
+                break;
+
+        case SIOCSMIIREG:
+                if (!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+
+                if (mii_data->phy_id == phydev->addr) {
+                        switch(mii_data->reg_num) {
+                        case MII_BMCR:
+                                if (val & (BMCR_RESET|BMCR_ANENABLE))
+                                        phydev->autoneg = AUTONEG_DISABLE;
+                                else
+                                        phydev->autoneg = AUTONEG_ENABLE;
+                                if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
+                                        phydev->duplex = DUPLEX_FULL;
+                                else
+                                        phydev->duplex = DUPLEX_HALF;
+                                break;
+                        case MII_ADVERTISE:
+                                phydev->advertising = val;
+                                break;
+                        default:
+                                /* do nothing */
+                                break;
+                        }
+                }
+
+                phy_write(phydev, mii_data->reg_num, val);
+                
+                if (mii_data->reg_num == MII_BMCR 
+                                && val & BMCR_RESET
+                                && phydev->drv->config_init)
+                        phydev->drv->config_init(phydev);
+                break;
+        }
+
+        return 0;
+}
+
+/* phy_start_aneg
+ *
+ * description: Sanitizes the settings (if we're not
+ *   autonegotiating them), and then calls the driver's
+ *   config_aneg function.  If the PHYCONTROL Layer is operating,
+ *   we change the state to reflect the beginning of
+ *   Auto-negotiation or forcing.
+ */
+int phy_start_aneg(struct phy_device *phydev)
+{
+        int err;
+
+        spin_lock(&phydev->lock);
+
+        if (AUTONEG_DISABLE == phydev->autoneg)
+                phy_sanitize_settings(phydev);
+
+        err = phydev->drv->config_aneg(phydev);
+
+#ifdef CONFIG_PHYCONTROL
+        if (err < 0)
+                goto out_unlock;
+
+        if (phydev->state != PHY_HALTED) {
+                if (AUTONEG_ENABLE == phydev->autoneg) {
+                        phydev->state = PHY_AN;
+                        phydev->link_timeout = PHY_AN_TIMEOUT;
+                } else {
+                        phydev->state = PHY_FORCING;
+                        phydev->link_timeout = PHY_FORCE_TIMEOUT;
+                }
+        }
+
+out_unlock:
+#endif
+        spin_unlock(&phydev->lock);
+        return err;
+}
+EXPORT_SYMBOL(phy_start_aneg);
+
+
+#ifdef CONFIG_PHYCONTROL
+static void phy_change(void *data);
+static void phy_timer(unsigned long data);
+
+/* phy_start_machine:
+ *
+ * description: The PHY infrastructure can run a state machine
+ *   which tracks whether the PHY is starting up, negotiating,
+ *   etc.  This function starts the timer which tracks the state
+ *   of the PHY.  If you want to be notified when the state
+ *   changes, pass in the callback, otherwise, pass NULL.  If you
+ *   want to maintain your own state machine, do not call this
+ *   function. */
+void phy_start_machine(struct phy_device *phydev,
+                void (*handler)(struct net_device *))
+{
+        phydev->adjust_state = handler;
+
+        init_timer(&phydev->phy_timer);
+        phydev->phy_timer.function = &phy_timer;
+        phydev->phy_timer.data = (unsigned long) phydev;
+        mod_timer(&phydev->phy_timer, jiffies + HZ);
+}
+
+/* phy_stop_machine
+ *
+ * description: Stops the state machine timer, sets the state to
+ *   UP (unless it wasn't up yet), and then frees the interrupt,
+ *   if it is in use. This function must be called BEFORE
+ *   phy_detach.
+ */
+void phy_stop_machine(struct phy_device *phydev)
+{
+        del_timer_sync(&phydev->phy_timer);
+
+        spin_lock(&phydev->lock);
+        if (phydev->state > PHY_UP)
+                phydev->state = PHY_UP;
+        spin_unlock(&phydev->lock);
+
+        if (phydev->irq != PHY_POLL)
+                phy_stop_interrupts(phydev);
+
+        phydev->adjust_state = NULL;
+}
+
+/* phy_force_reduction
+ *
+ * description: Reduces the speed/duplex settings by
+ *   one notch.  The order is so:
+ *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
+ *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
+ */
+static void phy_force_reduction(struct phy_device *phydev)
+{
+        int idx;
+
+        idx = phy_find_setting(phydev->speed, phydev->duplex);
+        
+        idx++;
+
+        idx = phy_find_valid(idx, phydev->supported);
+
+        phydev->speed = settings[idx].speed;
+        phydev->duplex = settings[idx].duplex;
+
+        pr_info("Trying %d/%s\n", phydev->speed,
+                        DUPLEX_FULL == phydev->duplex ?
+                        "FULL" : "HALF");
+}
+
+
+/* phy_error:
+ *
+ * Moves the PHY to the HALTED state in response to a read
+ * or write error, and tells the controller the link is down.
+ * Must not be called from interrupt context, or while the
+ * phydev->lock is held.
+ */
+void phy_error(struct phy_device *phydev)
+{
+        spin_lock(&phydev->lock);
+        phydev->state = PHY_HALTED;
+        spin_unlock(&phydev->lock);
+}
+
+/* phy_interrupt
+ *
+ * description: When a PHY interrupt occurs, the handler disables
+ * interrupts, and schedules a work task to clear the interrupt.
+ */
+static irqreturn_t phy_interrupt(int irq, void *phy_dat, struct pt_regs *regs)
+{
+        struct phy_device *phydev = phy_dat;
+
+        /* The MDIO bus is not allowed to be written in interrupt
+         * context, so we need to disable the irq here.  A work
+         * queue will write the PHY to disable and clear the
+         * interrupt, and then reenable the irq line. */
+        disable_irq_nosync(irq);
+
+        schedule_work(&phydev->phy_queue);
+
+        return IRQ_HANDLED;
+}
+
+/* Enable the interrupts from the PHY side */
+int phy_enable_interrupts(struct phy_device *phydev)
+{
+        int err;
+
+        err = phy_clear_interrupt(phydev);
+
+        if (err < 0)
+                return err;
+
+        err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
+
+        return err;
+}
+EXPORT_SYMBOL(phy_enable_interrupts);
+
+/* Disable the PHY interrupts from the PHY side */
+int phy_disable_interrupts(struct phy_device *phydev)
+{
+        int err;
+
+        /* Disable PHY interrupts */
+        err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
+
+        if (err)
+                goto phy_err;
+
+        /* Clear the interrupt */
+        err = phy_clear_interrupt(phydev);
+
+        if (err)
+                goto phy_err;
+
+        return 0;
+
+phy_err:
+        phy_error(phydev);
+
+        return err;
+}
+EXPORT_SYMBOL(phy_disable_interrupts);
+
+/* phy_start_interrupts
+ *
+ * description: Request the interrupt for the given PHY.  If
+ *   this fails, then we set irq to PHY_POLL.
+ *   Otherwise, we enable the interrupts in the PHY.
+ *   Returns 0 on success.
+ *   This should only be called with a valid IRQ number.
+ */
+int phy_start_interrupts(struct phy_device *phydev)
+{
+        int err = 0;
+
+        INIT_WORK(&phydev->phy_queue, phy_change, phydev);
+
+        if (request_irq(phydev->irq, phy_interrupt,
+                                SA_SHIRQ,
+                                "phy_interrupt",
+                                phydev) < 0) {
+                printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
+                                phydev->bus->name,
+                                phydev->irq);
+                phydev->irq = PHY_POLL;
+                return 0;
+        }
+
+        err = phy_enable_interrupts(phydev);
+
+        return err;
+}
+EXPORT_SYMBOL(phy_start_interrupts);
+
+int phy_stop_interrupts(struct phy_device *phydev)
+{
+        int err;
+
+        err = phy_disable_interrupts(phydev);
+
+        if (err)
+                phy_error(phydev);
+
+        free_irq(phydev->irq, phydev);
+
+        return err;
+}
+EXPORT_SYMBOL(phy_stop_interrupts);
+
+
+/* Scheduled by the phy_interrupt/timer to handle PHY changes */
+static void phy_change(void *data)
+{
+        int err;
+        struct phy_device *phydev = data;
+
+        err = phy_disable_interrupts(phydev);
+
+        if (err)
+                goto phy_err;
+
+        spin_lock(&phydev->lock);
+        if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
+                phydev->state = PHY_CHANGELINK;
+        spin_unlock(&phydev->lock);
+
+        enable_irq(phydev->irq);
+
+        /* Reenable interrupts */
+        err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
+
+        if (err)
+                goto irq_enable_err;
+
+        return;
+
+irq_enable_err:
+        disable_irq(phydev->irq);
+phy_err:
+        phy_error(phydev);
+}
+
+/* Bring down the PHY link, and stop checking the status. */
+void phy_stop(struct phy_device *phydev)
+{
+        spin_lock(&phydev->lock);
+
+        if (PHY_HALTED == phydev->state)
+                goto out_unlock;
+
+        if (phydev->irq != PHY_POLL) {
+                /* Clear any pending interrupts */
+                phy_clear_interrupt(phydev);
+
+                /* Disable PHY Interrupts */
+                phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
+        }
+
+        phydev->state = PHY_HALTED;
+
+out_unlock:
+        spin_unlock(&phydev->lock);
+}
+
+
+/* phy_start
+ *
+ * description: Indicates the attached device's readiness to
+ *   handle PHY-related work.  Used during startup to start the
+ *   PHY, and after a call to phy_stop() to resume operation.
+ *   Also used to indicate the MDIO bus has cleared an error
+ *   condition.
+ */
+void phy_start(struct phy_device *phydev)
+{
+        spin_lock(&phydev->lock);
+
+        switch (phydev->state) {
+                case PHY_STARTING:
+                        phydev->state = PHY_PENDING;
+                        break;
+                case PHY_READY:
+                        phydev->state = PHY_UP;
+                        break;
+                case PHY_HALTED:
+                        phydev->state = PHY_RESUMING;
+                default:
+                        break;
+        }
+        spin_unlock(&phydev->lock);
+}
+EXPORT_SYMBOL(phy_stop);
+EXPORT_SYMBOL(phy_start);
+
+/* PHY timer which handles the state machine */
+static void phy_timer(unsigned long data)
+{
+        struct phy_device *phydev = (struct phy_device *)data;
+        int needs_aneg = 0;
+        int err = 0;
+
+        spin_lock(&phydev->lock);
+
+        if (phydev->adjust_state)
+                phydev->adjust_state(phydev->attached_dev);
+
+        switch(phydev->state) {
+                case PHY_DOWN:
+                case PHY_STARTING:
+                case PHY_READY:
+                case PHY_PENDING:
+                        break;
+                case PHY_UP:
+                        needs_aneg = 1;
+
+                        phydev->link_timeout = PHY_AN_TIMEOUT;
+
+                        break;
+                case PHY_AN:
+                        /* Check if negotiation is done.  Break
+                         * if there's an error */
+                        err = phy_aneg_done(phydev);
+                        if (err < 0)
+                                break;
+
+                        /* If auto-negotiation is done, we change to
+                         * either RUNNING, or NOLINK */
+                        if (err > 0) {
+                                err = phy_read_status(phydev);
+
+                                if (err)
+                                        break;
+
+                                if (phydev->link) {
+                                        phydev->state = PHY_RUNNING;
+                                        netif_carrier_on(phydev->attached_dev);
+                                } else {
+                                        phydev->state = PHY_NOLINK;
+                                        netif_carrier_off(phydev->attached_dev);
+                                }
+
+                                phydev->adjust_link(phydev->attached_dev);
+
+                        } else if (0 == phydev->link_timeout--) {
+                                /* The counter expired, so either we
+                                 * switch to forced mode, or the
+                                 * magic_aneg bit exists, and we try aneg
+                                 * again */
+                                if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
+                                        int idx;
+
+                                        /* We'll start from the
+                                         * fastest speed, and work
+                                         * our way down */
+                                        idx = phy_find_valid(0,
+                                                        phydev->supported);
+
+                                        phydev->speed = settings[idx].speed;
+                                        phydev->duplex = settings[idx].duplex;
+                                        
+                                        phydev->autoneg = AUTONEG_DISABLE;
+                                        phydev->state = PHY_FORCING;
+                                        phydev->link_timeout =
+                                                PHY_FORCE_TIMEOUT;
+
+                                        pr_info("Trying %d/%s\n",
+                                                        phydev->speed,
+                                                        DUPLEX_FULL ==
+                                                        phydev->duplex ?
+                                                        "FULL" : "HALF");
+                                }
+
+                                needs_aneg = 1;
+                        }
+                        break;
+                case PHY_NOLINK:
+                        err = phy_read_status(phydev);
+
+                        if (err)
+                                break;
+
+                        if (phydev->link) {
+                                phydev->state = PHY_RUNNING;
+                                netif_carrier_on(phydev->attached_dev);
+                                phydev->adjust_link(phydev->attached_dev);
+                        }
+                        break;
+                case PHY_FORCING:
+                        err = phy_read_status(phydev);
+
+                        if (err)
+                                break;
+
+                        if (phydev->link) {
+                                phydev->state = PHY_RUNNING;
+                                netif_carrier_on(phydev->attached_dev);
+                        } else {
+                                if (0 == phydev->link_timeout--) {
+                                        phy_force_reduction(phydev);
+                                        needs_aneg = 1;
+                                }
+                        }
+
+                        phydev->adjust_link(phydev->attached_dev);
+                        break;
+                case PHY_RUNNING:
+                        /* Only register a CHANGE if we are
+                         * polling */
+                        if (PHY_POLL == phydev->irq)
+                                phydev->state = PHY_CHANGELINK;
+                        break;
+                case PHY_CHANGELINK:
+                        err = phy_read_status(phydev);
+
+                        if (err)
+                                break;
+
+                        if (phydev->link) {
+                                phydev->state = PHY_RUNNING;
+                                netif_carrier_on(phydev->attached_dev);
+                        } else {
+                                phydev->state = PHY_NOLINK;
+                                netif_carrier_off(phydev->attached_dev);
+                        }
+
+                        phydev->adjust_link(phydev->attached_dev);
+
+                        if (PHY_POLL != phydev->irq)
+                                err = phy_config_interrupt(phydev,
+                                                PHY_INTERRUPT_ENABLED);
+                        break;
+                case PHY_HALTED:
+                        if (phydev->link) {
+                                phydev->link = 0;
+                                netif_carrier_off(phydev->attached_dev);
+                                phydev->adjust_link(phydev->attached_dev);
+                        }
+                        break;
+                case PHY_RESUMING:
+
+                        err = phy_clear_interrupt(phydev);
+
+                        if (err)
+                                break;
+
+                        err = phy_config_interrupt(phydev,
+                                        PHY_INTERRUPT_ENABLED);
+
+                        if (err)
+                                break;
+
+                        if (AUTONEG_ENABLE == phydev->autoneg) {
+                                err = phy_aneg_done(phydev);
+                                if (err < 0)
+                                        break;
+
+                                /* err > 0 if AN is done.
+                                 * Otherwise, it's 0, and we're
+                                 * still waiting for AN */
+                                if (err > 0) {
+                                        phydev->state = PHY_RUNNING;
+                                } else {
+                                        phydev->state = PHY_AN;
+                                        phydev->link_timeout = PHY_AN_TIMEOUT;
+                                }
+                        } else
+                                phydev->state = PHY_RUNNING;
+                        break;
+        }
+
+        spin_unlock(&phydev->lock);
+
+        if (needs_aneg)
+                err = phy_start_aneg(phydev);
+
+        if (err < 0)
+                phy_error(phydev);
+
+        mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
+}
+
+#endif /* CONFIG_PHYCONTROL */