Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1371 insertions, 0 deletions

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
new file mode 100644
index 000000000..dd4bf4265
--- /dev/null
+++ b/drivers/net/phy/phy.c
@@ -0,0 +1,1371 @@
+/* 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.
+ *
+ */
+
+#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/interrupt.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/phy_led_triggers.h>
+#include <linux/workqueue.h>
+#include <linux/mdio.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+
+#include <asm/irq.h>
+
+#define PHY_STATE_STR(_state)			\
+	case PHY_##_state:			\
+		return __stringify(_state);	\
+
+static const char *phy_state_to_str(enum phy_state st)
+{
+	switch (st) {
+	PHY_STATE_STR(DOWN)
+	PHY_STATE_STR(STARTING)
+	PHY_STATE_STR(READY)
+	PHY_STATE_STR(PENDING)
+	PHY_STATE_STR(UP)
+	PHY_STATE_STR(AN)
+	PHY_STATE_STR(RUNNING)
+	PHY_STATE_STR(NOLINK)
+	PHY_STATE_STR(FORCING)
+	PHY_STATE_STR(CHANGELINK)
+	PHY_STATE_STR(HALTED)
+	PHY_STATE_STR(RESUMING)
+	}
+
+	return NULL;
+}
+
+
+/**
+ * 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)
+{
+	if (phydev->link) {
+		netdev_info(phydev->attached_dev,
+			"Link is Up - %s/%s - flow control %s\n",
+			phy_speed_to_str(phydev->speed),
+			phy_duplex_to_str(phydev->duplex),
+			phydev->pause ? "rx/tx" : "off");
+	} else	{
+		netdev_info(phydev->attached_dev, "Link is Down\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 or < 0 on error.
+ */
+static int phy_clear_interrupt(struct phy_device *phydev)
+{
+	if (phydev->drv->ack_interrupt)
+		return phydev->drv->ack_interrupt(phydev);
+
+	return 0;
+}
+
+/**
+ * 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 or < 0 on error.
+ */
+static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
+{
+	phydev->interrupts = interrupts;
+	if (phydev->drv->config_intr)
+		return phydev->drv->config_intr(phydev);
+
+	return 0;
+}
+
+/**
+ * phy_restart_aneg - restart auto-negotiation
+ * @phydev: target phy_device struct
+ *
+ * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
+ * negative errno on error.
+ */
+int phy_restart_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
+		ret = genphy_c45_restart_aneg(phydev);
+	else
+		ret = genphy_restart_aneg(phydev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phy_restart_aneg);
+
+/**
+ * phy_aneg_done - return auto-negotiation status
+ * @phydev: target phy_device struct
+ *
+ * Description: Return the auto-negotiation status from this @phydev
+ * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
+ * is still pending.
+ */
+int phy_aneg_done(struct phy_device *phydev)
+{
+	if (phydev->drv && phydev->drv->aneg_done)
+		return phydev->drv->aneg_done(phydev);
+
+	/* Avoid genphy_aneg_done() if the Clause 45 PHY does not
+	 * implement Clause 22 registers
+	 */
+	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
+		return -EINVAL;
+
+	return genphy_aneg_done(phydev);
+}
+EXPORT_SYMBOL(phy_aneg_done);
+
+/**
+ * phy_find_valid - find a PHY setting that matches the requested parameters
+ * @speed: desired speed
+ * @duplex: desired duplex
+ * @supported: mask of supported link modes
+ *
+ * Locate a supported phy setting that is, in priority order:
+ * - an exact match for the specified speed and duplex mode
+ * - a match for the specified speed, or slower speed
+ * - the slowest supported speed
+ * Returns the matched phy_setting entry, or %NULL if no supported phy
+ * settings were found.
+ */
+static const struct phy_setting *
+phy_find_valid(int speed, int duplex, u32 supported)
+{
+	unsigned long mask = supported;
+
+	return phy_lookup_setting(speed, duplex, &mask, BITS_PER_LONG, false);
+}
+
+/**
+ * phy_supported_speeds - return all speeds currently supported by a phy device
+ * @phy: The phy device to return supported speeds of.
+ * @speeds: buffer to store supported speeds in.
+ * @size:   size of speeds buffer.
+ *
+ * Description: Returns the number of supported speeds, and fills the speeds
+ * buffer with the supported speeds. If speeds buffer is too small to contain
+ * all currently supported speeds, will return as many speeds as can fit.
+ */
+unsigned int phy_supported_speeds(struct phy_device *phy,
+				  unsigned int *speeds,
+				  unsigned int size)
+{
+	unsigned long supported = phy->supported;
+
+	return phy_speeds(speeds, size, &supported, BITS_PER_LONG);
+}
+
+/**
+ * phy_check_valid - check if there is a valid PHY setting which matches
+ *		     speed, duplex, and feature mask
+ * @speed: speed to match
+ * @duplex: duplex to match
+ * @features: A mask of the valid settings
+ *
+ * Description: Returns true if there is a valid setting, false otherwise.
+ */
+static inline bool phy_check_valid(int speed, int duplex, u32 features)
+{
+	unsigned long mask = features;
+
+	return !!phy_lookup_setting(speed, duplex, &mask, BITS_PER_LONG, true);
+}
+
+/**
+ * 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)
+{
+	const struct phy_setting *setting;
+	u32 features = phydev->supported;
+
+	/* Sanitize settings based on PHY capabilities */
+	if ((features & SUPPORTED_Autoneg) == 0)
+		phydev->autoneg = AUTONEG_DISABLE;
+
+	setting = phy_find_valid(phydev->speed, phydev->duplex, features);
+	if (setting) {
+		phydev->speed = setting->speed;
+		phydev->duplex = setting->duplex;
+	} else {
+		/* We failed to find anything (no supported speeds?) */
+		phydev->speed = SPEED_UNKNOWN;
+		phydev->duplex = DUPLEX_UNKNOWN;
+	}
+}
+
+/**
+ * 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->mdio.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;
+
+	phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl;
+
+	/* Restart the PHY */
+	phy_start_aneg(phydev);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_ethtool_sset);
+
+int phy_ethtool_ksettings_set(struct phy_device *phydev,
+			      const struct ethtool_link_ksettings *cmd)
+{
+	u8 autoneg = cmd->base.autoneg;
+	u8 duplex = cmd->base.duplex;
+	u32 speed = cmd->base.speed;
+	u32 advertising;
+
+	if (cmd->base.phy_address != phydev->mdio.addr)
+		return -EINVAL;
+
+	ethtool_convert_link_mode_to_legacy_u32(&advertising,
+						cmd->link_modes.advertising);
+
+	/* We make sure that we don't pass unsupported values in to the PHY */
+	advertising &= phydev->supported;
+
+	/* Verify the settings we care about. */
+	if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
+		return -EINVAL;
+
+	if (autoneg == AUTONEG_ENABLE && advertising == 0)
+		return -EINVAL;
+
+	if (autoneg == AUTONEG_DISABLE &&
+	    ((speed != SPEED_1000 &&
+	      speed != SPEED_100 &&
+	      speed != SPEED_10) ||
+	     (duplex != DUPLEX_HALF &&
+	      duplex != DUPLEX_FULL)))
+		return -EINVAL;
+
+	phydev->autoneg = autoneg;
+
+	if (autoneg == AUTONEG_DISABLE) {
+		phydev->speed = speed;
+		phydev->duplex = duplex;
+	}
+
+	phydev->advertising = advertising;
+
+	if (autoneg == AUTONEG_ENABLE)
+		phydev->advertising |= ADVERTISED_Autoneg;
+	else
+		phydev->advertising &= ~ADVERTISED_Autoneg;
+
+	phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
+
+	/* Restart the PHY */
+	phy_start_aneg(phydev);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_ethtool_ksettings_set);
+
+void phy_ethtool_ksettings_get(struct phy_device *phydev,
+			       struct ethtool_link_ksettings *cmd)
+{
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
+						phydev->supported);
+
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
+						phydev->advertising);
+
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
+						phydev->lp_advertising);
+
+	cmd->base.speed = phydev->speed;
+	cmd->base.duplex = phydev->duplex;
+	if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
+		cmd->base.port = PORT_BNC;
+	else
+		cmd->base.port = PORT_MII;
+	cmd->base.transceiver = phy_is_internal(phydev) ?
+				XCVR_INTERNAL : XCVR_EXTERNAL;
+	cmd->base.phy_address = phydev->mdio.addr;
+	cmd->base.autoneg = phydev->autoneg;
+	cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
+	cmd->base.eth_tp_mdix = phydev->mdix;
+}
+EXPORT_SYMBOL(phy_ethtool_ksettings_get);
+
+/**
+ * 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;
+	bool change_autoneg = false;
+
+	switch (cmd) {
+	case SIOCGMIIPHY:
+		mii_data->phy_id = phydev->mdio.addr;
+		/* fall through */
+
+	case SIOCGMIIREG:
+		mii_data->val_out = mdiobus_read(phydev->mdio.bus,
+						 mii_data->phy_id,
+						 mii_data->reg_num);
+		return 0;
+
+	case SIOCSMIIREG:
+		if (mii_data->phy_id == phydev->mdio.addr) {
+			switch (mii_data->reg_num) {
+			case MII_BMCR:
+				if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
+					if (phydev->autoneg == AUTONEG_ENABLE)
+						change_autoneg = true;
+					phydev->autoneg = AUTONEG_DISABLE;
+					if (val & BMCR_FULLDPLX)
+						phydev->duplex = DUPLEX_FULL;
+					else
+						phydev->duplex = DUPLEX_HALF;
+					if (val & BMCR_SPEED1000)
+						phydev->speed = SPEED_1000;
+					else if (val & BMCR_SPEED100)
+						phydev->speed = SPEED_100;
+					else phydev->speed = SPEED_10;
+				}
+				else {
+					if (phydev->autoneg == AUTONEG_DISABLE)
+						change_autoneg = true;
+					phydev->autoneg = AUTONEG_ENABLE;
+				}
+				break;
+			case MII_ADVERTISE:
+				phydev->advertising = mii_adv_to_ethtool_adv_t(val);
+				change_autoneg = true;
+				break;
+			default:
+				/* do nothing */
+				break;
+			}
+		}
+
+		mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
+			      mii_data->reg_num, val);
+
+		if (mii_data->phy_id == phydev->mdio.addr &&
+		    mii_data->reg_num == MII_BMCR &&
+		    val & BMCR_RESET)
+			return phy_init_hw(phydev);
+
+		if (change_autoneg)
+			return phy_start_aneg(phydev);
+
+		return 0;
+
+	case SIOCSHWTSTAMP:
+		if (phydev->drv && phydev->drv->hwtstamp)
+			return phydev->drv->hwtstamp(phydev, ifr);
+		/* fall through */
+
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+EXPORT_SYMBOL(phy_mii_ioctl);
+
+static int phy_config_aneg(struct phy_device *phydev)
+{
+	if (phydev->drv->config_aneg)
+		return phydev->drv->config_aneg(phydev);
+
+	/* Clause 45 PHYs that don't implement Clause 22 registers are not
+	 * allowed to call genphy_config_aneg()
+	 */
+	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
+		return -EOPNOTSUPP;
+
+	return genphy_config_aneg(phydev);
+}
+
+/**
+ * phy_start_aneg_priv - start auto-negotiation for this PHY device
+ * @phydev: the phy_device struct
+ * @sync: indicate whether we should wait for the workqueue cancelation
+ *
+ * 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.
+ */
+static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
+{
+	bool trigger = 0;
+	int err;
+
+	if (!phydev->drv)
+		return -EIO;
+
+	mutex_lock(&phydev->lock);
+
+	if (AUTONEG_DISABLE == phydev->autoneg)
+		phy_sanitize_settings(phydev);
+
+	/* Invalidate LP advertising flags */
+	phydev->lp_advertising = 0;
+
+	err = phy_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;
+		}
+	}
+
+	/* Re-schedule a PHY state machine to check PHY status because
+	 * negotiation may already be done and aneg interrupt may not be
+	 * generated.
+	 */
+	if (!phy_polling_mode(phydev) && phydev->state == PHY_AN) {
+		err = phy_aneg_done(phydev);
+		if (err > 0) {
+			trigger = true;
+			err = 0;
+		}
+	}
+
+out_unlock:
+	mutex_unlock(&phydev->lock);
+
+	if (trigger)
+		phy_trigger_machine(phydev, sync);
+
+	return err;
+}
+
+/**
+ * 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)
+{
+	return phy_start_aneg_priv(phydev, true);
+}
+EXPORT_SYMBOL(phy_start_aneg);
+
+static int phy_poll_aneg_done(struct phy_device *phydev)
+{
+	unsigned int retries = 100;
+	int ret;
+
+	do {
+		msleep(100);
+		ret = phy_aneg_done(phydev);
+	} while (!ret && --retries);
+
+	if (!ret)
+		return -ETIMEDOUT;
+
+	return ret < 0 ? ret : 0;
+}
+
+/**
+ * phy_speed_down - set speed to lowest speed supported by both link partners
+ * @phydev: the phy_device struct
+ * @sync: perform action synchronously
+ *
+ * Description: Typically used to save energy when waiting for a WoL packet
+ *
+ * WARNING: Setting sync to false may cause the system being unable to suspend
+ * in case the PHY generates an interrupt when finishing the autonegotiation.
+ * This interrupt may wake up the system immediately after suspend.
+ * Therefore use sync = false only if you're sure it's safe with the respective
+ * network chip.
+ */
+int phy_speed_down(struct phy_device *phydev, bool sync)
+{
+	u32 adv = phydev->lp_advertising & phydev->supported;
+	u32 adv_old = phydev->advertising;
+	int ret;
+
+	if (phydev->autoneg != AUTONEG_ENABLE)
+		return 0;
+
+	if (adv & PHY_10BT_FEATURES)
+		phydev->advertising &= ~(PHY_100BT_FEATURES |
+					 PHY_1000BT_FEATURES);
+	else if (adv & PHY_100BT_FEATURES)
+		phydev->advertising &= ~PHY_1000BT_FEATURES;
+
+	if (phydev->advertising == adv_old)
+		return 0;
+
+	ret = phy_config_aneg(phydev);
+	if (ret)
+		return ret;
+
+	return sync ? phy_poll_aneg_done(phydev) : 0;
+}
+EXPORT_SYMBOL_GPL(phy_speed_down);
+
+/**
+ * phy_speed_up - (re)set advertised speeds to all supported speeds
+ * @phydev: the phy_device struct
+ *
+ * Description: Used to revert the effect of phy_speed_down
+ */
+int phy_speed_up(struct phy_device *phydev)
+{
+	u32 mask = PHY_10BT_FEATURES | PHY_100BT_FEATURES | PHY_1000BT_FEATURES;
+	u32 adv_old = phydev->advertising;
+
+	if (phydev->autoneg != AUTONEG_ENABLE)
+		return 0;
+
+	phydev->advertising = (adv_old & ~mask) | (phydev->supported & mask);
+
+	if (phydev->advertising == adv_old)
+		return 0;
+
+	return phy_config_aneg(phydev);
+}
+EXPORT_SYMBOL_GPL(phy_speed_up);
+
+/**
+ * phy_start_machine - start PHY state machine tracking
+ * @phydev: the phy_device struct
+ *
+ * Description: The PHY infrastructure can run a state machine
+ *   which tracks whether the PHY is starting up, negotiating,
+ *   etc.  This function starts the delayed workqueue which tracks
+ *   the state of the PHY. If you want to maintain your own state machine,
+ *   do not call this function.
+ */
+void phy_start_machine(struct phy_device *phydev)
+{
+	queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
+}
+EXPORT_SYMBOL_GPL(phy_start_machine);
+
+/**
+ * phy_trigger_machine - trigger the state machine to run
+ *
+ * @phydev: the phy_device struct
+ * @sync: indicate whether we should wait for the workqueue cancelation
+ *
+ * Description: There has been a change in state which requires that the
+ *   state machine runs.
+ */
+
+void phy_trigger_machine(struct phy_device *phydev, bool sync)
+{
+	if (sync)
+		cancel_delayed_work_sync(&phydev->state_queue);
+	else
+		cancel_delayed_work(&phydev->state_queue);
+	queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
+}
+
+/**
+ * phy_stop_machine - stop the PHY state machine tracking
+ * @phydev: target phy_device struct
+ *
+ * Description: Stops the state machine delayed workqueue, 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_HALTED)
+		phydev->state = PHY_UP;
+	mutex_unlock(&phydev->lock);
+}
+
+/**
+ * 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_trigger_machine(phydev, false);
+}
+
+/**
+ * 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)
+		return err;
+
+	/* Clear the interrupt */
+	return phy_clear_interrupt(phydev);
+}
+
+/**
+ * phy_change - Called by the phy_interrupt to handle PHY changes
+ * @phydev: phy_device struct that interrupted
+ */
+static irqreturn_t phy_change(struct phy_device *phydev)
+{
+	if (phy_interrupt_is_valid(phydev)) {
+		if (phydev->drv->did_interrupt &&
+		    !phydev->drv->did_interrupt(phydev))
+			return IRQ_NONE;
+
+		if (phydev->state == PHY_HALTED)
+			if (phy_disable_interrupts(phydev))
+				goto phy_err;
+	}
+
+	mutex_lock(&phydev->lock);
+	if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
+		phydev->state = PHY_CHANGELINK;
+	mutex_unlock(&phydev->lock);
+
+	/* reschedule state queue work to run as soon as possible */
+	phy_trigger_machine(phydev, true);
+
+	if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
+		goto phy_err;
+	return IRQ_HANDLED;
+
+phy_err:
+	phy_error(phydev);
+	return IRQ_NONE;
+}
+
+/**
+ * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
+ * @work: work_struct that describes the work to be done
+ */
+void phy_change_work(struct work_struct *work)
+{
+	struct phy_device *phydev =
+		container_of(work, struct phy_device, phy_queue);
+
+	phy_change(phydev);
+}
+
+/**
+ * phy_interrupt - PHY interrupt handler
+ * @irq: interrupt line
+ * @phy_dat: phy_device pointer
+ *
+ * Description: When a PHY interrupt occurs, the handler disables
+ * interrupts, and uses phy_change to handle 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.  */
+
+	return phy_change(phydev);
+}
+
+/**
+ * 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 = phy_clear_interrupt(phydev);
+
+	if (err < 0)
+		return err;
+
+	return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
+}
+
+/**
+ * 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)
+{
+	if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
+				 IRQF_ONESHOT | IRQF_SHARED,
+				 phydev_name(phydev), phydev) < 0) {
+		pr_warn("%s: Can't get IRQ %d (PHY)\n",
+			phydev->mdio.bus->name, phydev->irq);
+		phydev->irq = PHY_POLL;
+		return 0;
+	}
+
+	return phy_enable_interrupts(phydev);
+}
+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 = phy_disable_interrupts(phydev);
+
+	if (err)
+		phy_error(phydev);
+
+	free_irq(phydev->irq, phydev);
+
+	return err;
+}
+EXPORT_SYMBOL(phy_stop_interrupts);
+
+/**
+ * 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 (phy_interrupt_is_valid(phydev))
+		phy_disable_interrupts(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.
+	 */
+}
+EXPORT_SYMBOL(phy_stop);
+
+/**
+ * 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)
+{
+	int err = 0;
+
+	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:
+		/* if phy was suspended, bring the physical link up again */
+		__phy_resume(phydev);
+
+		/* make sure interrupts are re-enabled for the PHY */
+		if (phy_interrupt_is_valid(phydev)) {
+			err = phy_enable_interrupts(phydev);
+			if (err < 0)
+				break;
+		}
+
+		phydev->state = PHY_RESUMING;
+		break;
+	default:
+		break;
+	}
+	mutex_unlock(&phydev->lock);
+
+	phy_trigger_machine(phydev, true);
+}
+EXPORT_SYMBOL(phy_start);
+
+static void phy_link_up(struct phy_device *phydev)
+{
+	phydev->phy_link_change(phydev, true, true);
+	phy_led_trigger_change_speed(phydev);
+}
+
+static void phy_link_down(struct phy_device *phydev, bool do_carrier)
+{
+	phydev->phy_link_change(phydev, false, do_carrier);
+	phy_led_trigger_change_speed(phydev);
+}
+
+/**
+ * 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);
+	bool needs_aneg = false, do_suspend = false;
+	enum phy_state old_state;
+	int err = 0;
+	int old_link;
+
+	mutex_lock(&phydev->lock);
+
+	old_state = phydev->state;
+
+	if (phydev->drv && phydev->drv->link_change_notify)
+		phydev->drv->link_change_notify(phydev);
+
+	switch (phydev->state) {
+	case PHY_DOWN:
+	case PHY_STARTING:
+	case PHY_READY:
+	case PHY_PENDING:
+		break;
+	case PHY_UP:
+		needs_aneg = true;
+
+		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;
+			phy_link_down(phydev, true);
+			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;
+			phy_link_up(phydev);
+		} else if (0 == phydev->link_timeout--)
+			needs_aneg = true;
+		break;
+	case PHY_NOLINK:
+		if (!phy_polling_mode(phydev))
+			break;
+
+		err = phy_read_status(phydev);
+		if (err)
+			break;
+
+		if (phydev->link) {
+			if (AUTONEG_ENABLE == phydev->autoneg) {
+				err = phy_aneg_done(phydev);
+				if (err < 0)
+					break;
+
+				if (!err) {
+					phydev->state = PHY_AN;
+					phydev->link_timeout = PHY_AN_TIMEOUT;
+					break;
+				}
+			}
+			phydev->state = PHY_RUNNING;
+			phy_link_up(phydev);
+		}
+		break;
+	case PHY_FORCING:
+		err = genphy_update_link(phydev);
+		if (err)
+			break;
+
+		if (phydev->link) {
+			phydev->state = PHY_RUNNING;
+			phy_link_up(phydev);
+		} else {
+			if (0 == phydev->link_timeout--)
+				needs_aneg = true;
+			phy_link_down(phydev, false);
+		}
+		break;
+	case PHY_RUNNING:
+		/* Only register a CHANGE if we are polling and link changed
+		 * since latest checking.
+		 */
+		if (phy_polling_mode(phydev)) {
+			old_link = phydev->link;
+			err = phy_read_status(phydev);
+			if (err)
+				break;
+
+			if (old_link != phydev->link)
+				phydev->state = PHY_CHANGELINK;
+		}
+		/*
+		 * Failsafe: check that nobody set phydev->link=0 between two
+		 * poll cycles, otherwise we won't leave RUNNING state as long
+		 * as link remains down.
+		 */
+		if (!phydev->link && phydev->state == PHY_RUNNING) {
+			phydev->state = PHY_CHANGELINK;
+			phydev_err(phydev, "no link in PHY_RUNNING\n");
+		}
+		break;
+	case PHY_CHANGELINK:
+		err = phy_read_status(phydev);
+		if (err)
+			break;
+
+		if (phydev->link) {
+			phydev->state = PHY_RUNNING;
+			phy_link_up(phydev);
+		} else {
+			phydev->state = PHY_NOLINK;
+			phy_link_down(phydev, true);
+		}
+		break;
+	case PHY_HALTED:
+		if (phydev->link) {
+			phydev->link = 0;
+			phy_link_down(phydev, true);
+			do_suspend = true;
+		}
+		break;
+	case PHY_RESUMING:
+		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;
+					phy_link_up(phydev);
+				} else	{
+					phydev->state = PHY_NOLINK;
+					phy_link_down(phydev, false);
+				}
+			} 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;
+				phy_link_up(phydev);
+			} else	{
+				phydev->state = PHY_NOLINK;
+				phy_link_down(phydev, false);
+			}
+		}
+		break;
+	}
+
+	mutex_unlock(&phydev->lock);
+
+	if (needs_aneg)
+		err = phy_start_aneg_priv(phydev, false);
+	else if (do_suspend)
+		phy_suspend(phydev);
+
+	if (err < 0)
+		phy_error(phydev);
+
+	if (old_state != phydev->state)
+		phydev_dbg(phydev, "PHY state change %s -> %s\n",
+			   phy_state_to_str(old_state),
+			   phy_state_to_str(phydev->state));
+
+	/* Only re-schedule a PHY state machine change if we are polling the
+	 * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
+	 * between states from phy_mac_interrupt()
+	 */
+	if (phy_polling_mode(phydev))
+		queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
+				   PHY_STATE_TIME * HZ);
+}
+
+/**
+ * phy_mac_interrupt - MAC says the link has changed
+ * @phydev: phy_device struct with changed link
+ *
+ * The MAC layer is able to indicate there has been a change in the PHY link
+ * status. Trigger the state machine and work a work queue.
+ */
+void phy_mac_interrupt(struct phy_device *phydev)
+{
+	/* Trigger a state machine change */
+	queue_work(system_power_efficient_wq, &phydev->phy_queue);
+}
+EXPORT_SYMBOL(phy_mac_interrupt);
+
+/**
+ * phy_init_eee - init and check the EEE feature
+ * @phydev: target phy_device struct
+ * @clk_stop_enable: PHY may stop the clock during LPI
+ *
+ * Description: it checks if the Energy-Efficient Ethernet (EEE)
+ * is supported by looking at the MMD registers 3.20 and 7.60/61
+ * and it programs the MMD register 3.0 setting the "Clock stop enable"
+ * bit if required.
+ */
+int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
+{
+	if (!phydev->drv)
+		return -EIO;
+
+	/* According to 802.3az,the EEE is supported only in full duplex-mode.
+	 */
+	if (phydev->duplex == DUPLEX_FULL) {
+		int eee_lp, eee_cap, eee_adv;
+		u32 lp, cap, adv;
+		int status;
+
+		/* Read phy status to properly get the right settings */
+		status = phy_read_status(phydev);
+		if (status)
+			return status;
+
+		/* First check if the EEE ability is supported */
+		eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
+		if (eee_cap <= 0)
+			goto eee_exit_err;
+
+		cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
+		if (!cap)
+			goto eee_exit_err;
+
+		/* Check which link settings negotiated and verify it in
+		 * the EEE advertising registers.
+		 */
+		eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
+		if (eee_lp <= 0)
+			goto eee_exit_err;
+
+		eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
+		if (eee_adv <= 0)
+			goto eee_exit_err;
+
+		adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
+		lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
+		if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
+			goto eee_exit_err;
+
+		if (clk_stop_enable) {
+			/* Configure the PHY to stop receiving xMII
+			 * clock while it is signaling LPI.
+			 */
+			int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
+			if (val < 0)
+				return val;
+
+			val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
+			phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
+		}
+
+		return 0; /* EEE supported */
+	}
+eee_exit_err:
+	return -EPROTONOSUPPORT;
+}
+EXPORT_SYMBOL(phy_init_eee);
+
+/**
+ * phy_get_eee_err - report the EEE wake error count
+ * @phydev: target phy_device struct
+ *
+ * Description: it is to report the number of time where the PHY
+ * failed to complete its normal wake sequence.
+ */
+int phy_get_eee_err(struct phy_device *phydev)
+{
+	if (!phydev->drv)
+		return -EIO;
+
+	return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
+}
+EXPORT_SYMBOL(phy_get_eee_err);
+
+/**
+ * phy_ethtool_get_eee - get EEE supported and status
+ * @phydev: target phy_device struct
+ * @data: ethtool_eee data
+ *
+ * Description: it reportes the Supported/Advertisement/LP Advertisement
+ * capabilities.
+ */
+int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
+{
+	int val;
+
+	if (!phydev->drv)
+		return -EIO;
+
+	/* Get Supported EEE */
+	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
+	if (val < 0)
+		return val;
+	data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
+
+	/* Get advertisement EEE */
+	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
+	if (val < 0)
+		return val;
+	data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
+
+	/* Get LP advertisement EEE */
+	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
+	if (val < 0)
+		return val;
+	data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_ethtool_get_eee);
+
+/**
+ * phy_ethtool_set_eee - set EEE supported and status
+ * @phydev: target phy_device struct
+ * @data: ethtool_eee data
+ *
+ * Description: it is to program the Advertisement EEE register.
+ */
+int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
+{
+	int cap, old_adv, adv, ret;
+
+	if (!phydev->drv)
+		return -EIO;
+
+	/* Get Supported EEE */
+	cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
+	if (cap < 0)
+		return cap;
+
+	old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
+	if (old_adv < 0)
+		return old_adv;
+
+	adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
+
+	/* Mask prohibited EEE modes */
+	adv &= ~phydev->eee_broken_modes;
+
+	if (old_adv != adv) {
+		ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
+		if (ret < 0)
+			return ret;
+
+		/* Restart autonegotiation so the new modes get sent to the
+		 * link partner.
+		 */
+		if (phydev->autoneg == AUTONEG_ENABLE) {
+			ret = phy_restart_aneg(phydev);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_ethtool_set_eee);
+
+int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
+{
+	if (phydev->drv && phydev->drv->set_wol)
+		return phydev->drv->set_wol(phydev, wol);
+
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(phy_ethtool_set_wol);
+
+void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
+{
+	if (phydev->drv && phydev->drv->get_wol)
+		phydev->drv->get_wol(phydev, wol);
+}
+EXPORT_SYMBOL(phy_ethtool_get_wol);
+
+int phy_ethtool_get_link_ksettings(struct net_device *ndev,
+				   struct ethtool_link_ksettings *cmd)
+{
+	struct phy_device *phydev = ndev->phydev;
+
+	if (!phydev)
+		return -ENODEV;
+
+	phy_ethtool_ksettings_get(phydev, cmd);
+
+	return 0;
+}
+EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
+
+int phy_ethtool_set_link_ksettings(struct net_device *ndev,
+				   const struct ethtool_link_ksettings *cmd)
+{
+	struct phy_device *phydev = ndev->phydev;
+
+	if (!phydev)
+		return -ENODEV;
+
+	return phy_ethtool_ksettings_set(phydev, cmd);
+}
+EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
+
+int phy_ethtool_nway_reset(struct net_device *ndev)
+{
+	struct phy_device *phydev = ndev->phydev;
+
+	if (!phydev)
+		return -ENODEV;
+
+	if (!phydev->drv)
+		return -EIO;
+
+	return phy_restart_aneg(phydev);
+}
+EXPORT_SYMBOL(phy_ethtool_nway_reset);