zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/net/phy/phy.c b/ap/os/linux/linux-3.4.x/drivers/net/phy/phy.c
new file mode 100644
index 0000000..2a68618
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/net/phy/phy.c
@@ -0,0 +1,981 @@
+/*
+ * 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.
+ * Copyright (c) 2006, 2007 Maciej W. Rozycki
+ *
+ * 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/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/unistd.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/timer.h>
+#include <linux/workqueue.h>
+
+#include <linux/atomic.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+/**
+ * phy_print_status - Convenience function to print out the current phy status
+ * @phydev: the phy_device struct
+ */
+void phy_print_status(struct phy_device *phydev)
+{
+ pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev),
+ phydev->link ? "Up" : "Down");
+ if (phydev->link)
+ printk(KERN_CONT " - %d/%s", phydev->speed,
+ DUPLEX_FULL == phydev->duplex ?
+ "Full" : "Half");
+
+ printk(KERN_CONT "\n");
+}
+EXPORT_SYMBOL(phy_print_status);
+
+
+/**
+ * phy_clear_interrupt - Ack the phy device's interrupt
+ * @phydev: the phy_device struct
+ *
+ * If the @phydev driver has an ack_interrupt function, call it to
+ * ack and clear the phy device's interrupt.
+ *
+ * Returns 0 on success on < 0 on error.
+ */
+static int phy_clear_interrupt(struct phy_device *phydev)
+{
+ int err = 0;
+
+ if (phydev->drv->ack_interrupt)
+ err = phydev->drv->ack_interrupt(phydev);
+
+ return err;
+}
+
+/**
+ * phy_config_interrupt - configure the PHY device for the requested interrupts
+ * @phydev: the phy_device struct
+ * @interrupts: interrupt flags to configure for this @phydev
+ *
+ * Returns 0 on success on < 0 on error.
+ */
+static 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 - 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.
+ */
+static inline int phy_aneg_done(struct phy_device *phydev)
+{
+ int retval;
+
+ if((phydev->drv->features & SUPPORTED_Autoneg)==0)
+ return BMSR_ANEGCOMPLETE;
+
+ 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 const 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 ARRAY_SIZE(settings)
+
+/**
+ * phy_find_setting - find a PHY settings array entry that matches speed & duplex
+ * @speed: speed to match
+ * @duplex: duplex to match
+ *
+ * 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 - find a PHY setting that matches the requested features mask
+ * @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 - make sure the PHY is set to supported speed and duplex
+ * @phydev: the target phy_device struct
+ *
+ * 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.
+ */
+static 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 = AUTONEG_DISABLE;
+
+ idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
+ features);
+
+ phydev->speed = settings[idx].speed;
+ phydev->duplex = settings[idx].duplex;
+}
+
+/**
+ * phy_ethtool_sset - generic ethtool sset function, handles all the details
+ * @phydev: target phy_device struct
+ * @cmd: ethtool_cmd
+ *
+ * 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.
+ */
+int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
+{
+ u32 speed = ethtool_cmd_speed(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 &&
+ ((speed != SPEED_1000 &&
+ speed != SPEED_100 &&
+ speed != SPEED_10) ||
+ (cmd->duplex != DUPLEX_HALF &&
+ cmd->duplex != DUPLEX_FULL)))
+ return -EINVAL;
+
+ phydev->autoneg = cmd->autoneg;
+
+ phydev->speed = 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;
+}
+EXPORT_SYMBOL(phy_ethtool_sset);
+
+int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
+{
+ cmd->supported = phydev->supported;
+
+ cmd->advertising = phydev->advertising;
+
+ ethtool_cmd_speed_set(cmd, 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;
+}
+EXPORT_SYMBOL(phy_ethtool_gset);
+
+/**
+ * phy_mii_ioctl - generic PHY MII ioctl interface
+ * @phydev: the phy_device struct
+ * @ifr: &struct ifreq for socket ioctl's
+ * @cmd: ioctl cmd to execute
+ *
+ * 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 ifreq *ifr, int cmd)
+{
+ struct mii_ioctl_data *mii_data = if_mii(ifr);
+ u16 val = mii_data->val_in;
+
+ switch (cmd) {
+ case SIOCGMIIPHY:
+ mii_data->phy_id = phydev->addr;
+ /* fall through */
+
+ case SIOCGMIIREG:
+ mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id,
+ mii_data->reg_num);
+ break;
+
+ case SIOCSMIIREG:
+ if (mii_data->phy_id == phydev->addr) {
+ switch(mii_data->reg_num) {
+ case MII_BMCR:
+ if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
+ phydev->autoneg = AUTONEG_DISABLE;
+ else
+ phydev->autoneg = AUTONEG_ENABLE;
+ if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
+ phydev->duplex = DUPLEX_FULL;
+ else
+ phydev->duplex = DUPLEX_HALF;
+ if ((!phydev->autoneg) &&
+ (val & BMCR_SPEED1000))
+ phydev->speed = SPEED_1000;
+ else if ((!phydev->autoneg) &&
+ (val & BMCR_SPEED100))
+ phydev->speed = SPEED_100;
+ break;
+ case MII_ADVERTISE:
+ phydev->advertising = val;
+ break;
+ default:
+ /* do nothing */
+ break;
+ }
+ }
+
+ mdiobus_write(phydev->bus, mii_data->phy_id,
+ mii_data->reg_num, val);
+
+ if (mii_data->reg_num == MII_BMCR &&
+ val & BMCR_RESET &&
+ phydev->drv->config_init) {
+ phy_scan_fixups(phydev);
+ phydev->drv->config_init(phydev);
+ }
+ break;
+
+ case SIOCVLAN:
+ if (phydev->drv->auto_adapt)
+ return phydev->drv->auto_adapt(phydev, ifr);
+ break;
+
+ case SIOCSHWTSTAMP:
+ if (phydev->drv->hwtstamp)
+ return phydev->drv->hwtstamp(phydev, ifr);
+ /* fall through */
+
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(phy_mii_ioctl);
+
+/**
+ * phy_start_aneg - start auto-negotiation for this PHY device
+ * @phydev: the phy_device struct
+ *
+ * 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;
+
+ mutex_lock(&phydev->lock);
+
+ if (AUTONEG_DISABLE == phydev->autoneg)
+ phy_sanitize_settings(phydev);
+
+ err = phydev->drv->config_aneg(phydev);
+
+ 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:
+ mutex_unlock(&phydev->lock);
+ return err;
+}
+EXPORT_SYMBOL(phy_start_aneg);
+
+
+static void phy_change(struct work_struct *work);
+
+/**
+ * phy_start_machine - start PHY state machine tracking
+ * @phydev: the phy_device struct
+ * @handler: callback function for state change notifications
+ *
+ * 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 @handler, 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;
+
+ schedule_delayed_work(&phydev->state_queue, HZ);
+}
+
+/**
+ * phy_stop_machine - stop the PHY state machine tracking
+ * @phydev: target phy_device struct
+ *
+ * Description: Stops the state machine timer, sets the state to UP
+ * (unless it wasn't up yet). This function must be called BEFORE
+ * phy_detach.
+ */
+void phy_stop_machine(struct phy_device *phydev)
+{
+ cancel_delayed_work_sync(&phydev->state_queue);
+
+ mutex_lock(&phydev->lock);
+ if (phydev->state > PHY_UP)
+ phydev->state = PHY_UP;
+ mutex_unlock(&phydev->lock);
+
+ phydev->adjust_state = NULL;
+}
+
+/**
+ * phy_force_reduction - reduce PHY speed/duplex settings by one step
+ * @phydev: target phy_device struct
+ *
+ * Description: Reduces the speed/duplex settings by one notch,
+ * in this order--
+ * 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 - enter HALTED state for this PHY device
+ * @phydev: target phy_device struct
+ *
+ * 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.
+ */
+static void phy_error(struct phy_device *phydev)
+{
+ mutex_lock(&phydev->lock);
+ phydev->state = PHY_HALTED;
+ mutex_unlock(&phydev->lock);
+}
+
+/**
+ * phy_interrupt - PHY interrupt handler
+ * @irq: interrupt line
+ * @phy_dat: phy_device pointer
+ *
+ * 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 phy_device *phydev = phy_dat;
+
+ if (PHY_HALTED == phydev->state)
+ return IRQ_NONE; /* It can't be ours. */
+
+ /* 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);
+ atomic_inc(&phydev->irq_disable);
+
+ schedule_work(&phydev->phy_queue);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * phy_enable_interrupts - Enable the interrupts from the PHY side
+ * @phydev: target phy_device struct
+ */
+static 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;
+}
+
+/**
+ * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
+ * @phydev: target phy_device struct
+ */
+static 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;
+}
+
+/**
+ * phy_start_interrupts - request and enable interrupts for a PHY device
+ * @phydev: target phy_device struct
+ *
+ * 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.
+ * This should only be called with a valid IRQ number.
+ * Returns 0 on success or < 0 on error.
+ */
+int phy_start_interrupts(struct phy_device *phydev)
+{
+ int err = 0;
+
+ INIT_WORK(&phydev->phy_queue, phy_change);
+
+ atomic_set(&phydev->irq_disable, 0);
+ if (request_irq(phydev->irq, phy_interrupt,
+ IRQF_SHARED,
+ "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);
+
+/**
+ * phy_stop_interrupts - disable interrupts from a PHY device
+ * @phydev: target phy_device struct
+ */
+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);
+
+ /*
+ * Cannot call flush_scheduled_work() here as desired because
+ * of rtnl_lock(), but we do not really care about what would
+ * be done, except from enable_irq(), so cancel any work
+ * possibly pending and take care of the matter below.
+ */
+ cancel_work_sync(&phydev->phy_queue);
+ /*
+ * If work indeed has been cancelled, disable_irq() will have
+ * been left unbalanced from phy_interrupt() and enable_irq()
+ * has to be called so that other devices on the line work.
+ */
+ while (atomic_dec_return(&phydev->irq_disable) >= 0)
+ enable_irq(phydev->irq);
+
+ return err;
+}
+EXPORT_SYMBOL(phy_stop_interrupts);
+
+
+/**
+ * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
+ * @work: work_struct that describes the work to be done
+ */
+static void phy_change(struct work_struct *work)
+{
+ int err;
+ struct phy_device *phydev =
+ container_of(work, struct phy_device, phy_queue);
+
+ if (phydev->drv->did_interrupt &&
+ !phydev->drv->did_interrupt(phydev))
+ goto ignore;
+
+ err = phy_disable_interrupts(phydev);
+
+ if (err)
+ goto phy_err;
+
+ mutex_lock(&phydev->lock);
+ if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
+ phydev->state = PHY_CHANGELINK;
+ mutex_unlock(&phydev->lock);
+
+ atomic_dec(&phydev->irq_disable);
+ enable_irq(phydev->irq);
+
+ /* Reenable interrupts */
+ if (PHY_HALTED != phydev->state)
+ err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
+
+ if (err)
+ goto irq_enable_err;
+
+ /* reschedule state queue work to run as soon as possible */
+ cancel_delayed_work_sync(&phydev->state_queue);
+ schedule_delayed_work(&phydev->state_queue, 0);
+
+ return;
+
+ignore:
+ atomic_dec(&phydev->irq_disable);
+ enable_irq(phydev->irq);
+ return;
+
+irq_enable_err:
+ disable_irq(phydev->irq);
+ atomic_inc(&phydev->irq_disable);
+phy_err:
+ phy_error(phydev);
+}
+
+/**
+ * phy_stop - Bring down the PHY link, and stop checking the status
+ * @phydev: target phy_device struct
+ */
+void phy_stop(struct phy_device *phydev)
+{
+ mutex_lock(&phydev->lock);
+
+ if (PHY_HALTED == phydev->state)
+ goto out_unlock;
+
+ if (phydev->irq != PHY_POLL) {
+ /* Disable PHY Interrupts */
+ phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
+
+ /* Clear any pending interrupts */
+ phy_clear_interrupt(phydev);
+ }
+
+ phydev->state = PHY_HALTED;
+
+out_unlock:
+ mutex_unlock(&phydev->lock);
+
+ /*
+ * Cannot call flush_scheduled_work() here as desired because
+ * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
+ * will not reenable interrupts.
+ */
+}
+
+
+/**
+ * phy_start - start or restart a PHY device
+ * @phydev: target phy_device struct
+ *
+ * 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)
+{
+ mutex_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;
+ }
+ mutex_unlock(&phydev->lock);
+}
+EXPORT_SYMBOL(phy_stop);
+EXPORT_SYMBOL(phy_start);
+
+/**
+ * phy_state_machine - Handle the state machine
+ * @work: work_struct that describes the work to be done
+ */
+void phy_state_machine(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct phy_device *phydev =
+ container_of(dwork, struct phy_device, state_queue);
+ int needs_aneg = 0;
+ int err = 0;
+
+ mutex_lock(&phydev->lock);
+
+ if (phydev->adjust_state)
+ phydev->adjust_state(phydev->attached_dev);
+
+ if ((phydev->drv)&&(phydev->drv->private_proc))
+ phydev->drv->private_proc(phydev);
+
+ 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:
+ err = phy_read_status(phydev);
+
+ if (err < 0)
+ break;
+
+ /* If the link is down, give up on
+ * negotiation for now */
+ if (!phydev->link) {
+ phydev->state = PHY_NOLINK;
+ netif_carrier_off(phydev->attached_dev);
+ phydev->adjust_link(phydev->attached_dev);
+ break;
+ }
+
+ /* Check if negotiation is done. Break
+ * if there's an error */
+ err = phy_aneg_done(phydev);
+ if (err < 0)
+ break;
+
+ /* If AN is done, we're running */
+ if (err > 0) {
+ phydev->state = PHY_RUNNING;
+ netif_carrier_on(phydev->attached_dev);
+ phydev->adjust_link(phydev->attached_dev);
+
+ } else if (0 == phydev->link_timeout--) {
+ int idx;
+
+ needs_aneg = 1;
+ /* If we have the magic_aneg bit,
+ * we try again */
+ if (phydev->drv->flags & PHY_HAS_MAGICANEG)
+ break;
+
+ /* The timer expired, and we still
+ * don't have a setting, so we try
+ * forcing it until we find one that
+ * works, starting from the fastest speed,
+ * and working our way down */
+ idx = phy_find_valid(0, phydev->supported);
+
+ phydev->speed = settings[idx].speed;
+ phydev->duplex = settings[idx].duplex;
+
+ phydev->autoneg = AUTONEG_DISABLE;
+
+ pr_info("Trying %d/%s\n", phydev->speed,
+ DUPLEX_FULL ==
+ phydev->duplex ?
+ "FULL" : "HALF");
+ }
+ 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 = genphy_update_link(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) {
+ 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;
+ phydev->adjust_link(phydev->attached_dev);
+ } else {
+ phydev->state = PHY_AN;
+ phydev->link_timeout = PHY_AN_TIMEOUT;
+ }
+ } else {
+ 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;
+ phydev->adjust_link(phydev->attached_dev);
+ }
+ break;
+ }
+
+ mutex_unlock(&phydev->lock);
+
+ if (needs_aneg)
+ err = phy_start_aneg(phydev);
+
+ if (err < 0)
+ phy_error(phydev);
+
+ schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
+}