phy.c

// SPDX-License-Identifier: GPL-2.0+
/* 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
 */

#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>

#define PHY_STATE_TIME	HZ

#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(READY)
	PHY_STATE_STR(UP)
	PHY_STATE_STR(RUNNING)
	PHY_STATE_STR(NOLINK)
	PHY_STATE_STR(FORCING)
	PHY_STATE_STR(HALTED)
	}

	return NULL;
}

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);
}

static const char *phy_pause_str(struct phy_device *phydev)
{
	bool local_pause, local_asym_pause;

	if (phydev->autoneg == AUTONEG_DISABLE)
		goto no_pause;

	local_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
					phydev->advertising);
	local_asym_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
					     phydev->advertising);

	if (local_pause && phydev->pause)
		return "rx/tx";

	if (local_asym_pause && phydev->asym_pause) {
		if (local_pause)
			return "rx";
		if (phydev->pause)
			return "tx";
	}

no_pause:
	return "off";
}

/**
 * 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),
			phy_pause_str(phydev));
	} 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, bool interrupts)
{
	phydev->interrupts = interrupts ? 1 : 0;
	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);
	else if (phydev->is_c45)
		return genphy_c45_aneg_done(phydev);
	else
		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, unsigned long *supported)
{
	return phy_lookup_setting(speed, duplex, supported, 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)
{
	return phy_speeds(speeds, size, phy->supported);
}

/**
 * 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,
				   unsigned long *features)
{
	return !!phy_lookup_setting(speed, duplex, features, 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;

	setting = phy_find_valid(phydev->speed, phydev->duplex,
				 phydev->supported);
	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)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
	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 */
	ethtool_convert_legacy_u32_to_link_mode(advertising, cmd->advertising);
	linkmode_and(advertising, 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;

	linkmode_copy(phydev->advertising, advertising);

	if (AUTONEG_ENABLE == cmd->autoneg)
		linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
				 phydev->advertising);
	else
		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
				   phydev->advertising);

	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)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
	u8 autoneg = cmd->base.autoneg;
	u8 duplex = cmd->base.duplex;
	u32 speed = cmd->base.speed;

	if (cmd->base.phy_address != phydev->mdio.addr)
		return -EINVAL;

	linkmode_copy(advertising, cmd->link_modes.advertising);

	/* We make sure that we don't pass unsupported values in to the PHY */
	linkmode_and(advertising, advertising, phydev->supported);

	/* Verify the settings we care about. */
	if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
		return -EINVAL;

	if (autoneg == AUTONEG_ENABLE && linkmode_empty(advertising))
		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;

	phydev->speed = speed;

	linkmode_copy(phydev->advertising, advertising);

	if (autoneg == AUTONEG_ENABLE)
		linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
				 phydev->advertising);
	else
		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
				   phydev->advertising);

	phydev->duplex = duplex;

	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)
{
	linkmode_copy(cmd->link_modes.supported, phydev->supported);
	linkmode_copy(cmd->link_modes.advertising, phydev->advertising);
	linkmode_copy(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:
				mii_adv_mod_linkmode_adv_t(phydev->advertising,
							   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);

void phy_queue_state_machine(struct phy_device *phydev, unsigned long jiffies)
{
	mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
			 jiffies);
}
EXPORT_SYMBOL(phy_queue_state_machine);

static void phy_trigger_machine(struct phy_device *phydev)
{
	phy_queue_state_machine(phydev, 0);
}

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_check_link_status - check link status and set state accordingly
 * @phydev: the phy_device struct
 *
 * Description: Check for link and whether autoneg was triggered / is running
 * and set state accordingly
 */
static int phy_check_link_status(struct phy_device *phydev)
{
	int err;

	WARN_ON(!mutex_is_locked(&phydev->lock));

	err = phy_read_status(phydev);
	if (err)
		return err;

	if (phydev->link && phydev->state != PHY_RUNNING) {
		phydev->state = PHY_RUNNING;
		phy_link_up(phydev);
	} else if (!phydev->link && phydev->state != PHY_NOLINK) {
		phydev->state = PHY_NOLINK;
		phy_link_down(phydev, true);
	}

	return 0;
}

/**
 * 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;

	if (!phydev->drv)
		return -EIO;

	mutex_lock(&phydev->lock);

	if (AUTONEG_DISABLE == phydev->autoneg)
		phy_sanitize_settings(phydev);

	/* Invalidate LP advertising flags */
	linkmode_zero(phydev->lp_advertising);

	err = phy_config_aneg(phydev);
	if (err < 0)
		goto out_unlock;

	if (phy_is_started(phydev)) {
		if (phydev->autoneg == AUTONEG_ENABLE) {
			err = phy_check_link_status(phydev);
		} 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 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)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
	int ret;

	if (phydev->autoneg != AUTONEG_ENABLE)
		return 0;

	linkmode_copy(adv_old, phydev->advertising);
	linkmode_copy(adv, phydev->lp_advertising);
	linkmode_and(adv, adv, phydev->supported);

	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, adv) ||
	    linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, adv)) {
		linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
				   phydev->advertising);
		linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
				   phydev->advertising);
		linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
				   phydev->advertising);
		linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
				   phydev->advertising);
	} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
				     adv) ||
		   linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
				     adv)) {
		linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
				   phydev->advertising);
		linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
				   phydev->advertising);
	}

	if (linkmode_equal(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)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(all_speeds) = { 0, };
	__ETHTOOL_DECLARE_LINK_MODE_MASK(not_speeds);
	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
	__ETHTOOL_DECLARE_LINK_MODE_MASK(speeds);

	linkmode_copy(adv_old, phydev->advertising);

	if (phydev->autoneg != AUTONEG_ENABLE)
		return 0;

	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, all_speeds);
	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, all_speeds);
	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, all_speeds);
	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, all_speeds);
	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, all_speeds);
	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, all_speeds);

	linkmode_andnot(not_speeds, adv_old, all_speeds);
	linkmode_copy(supported, phydev->supported);
	linkmode_and(speeds, supported, all_speeds);
	linkmode_or(phydev->advertising, not_speeds, speeds);

	if (linkmode_equal(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)
{
	phy_trigger_machine(phydev);
}
EXPORT_SYMBOL_GPL(phy_start_machine);

/**
 * 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 (phy_is_started(phydev))
		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)
{
	WARN_ON(1);

	mutex_lock(&phydev->lock);
	phydev->state = PHY_HALTED;
	mutex_unlock(&phydev->lock);

	phy_trigger_machine(phydev);
}

/**
 * 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_interrupt - PHY interrupt handler
 * @irq: interrupt line
 * @phy_dat: phy_device pointer
 *
 * Description: Handle PHY interrupt
 */
static irqreturn_t phy_interrupt(int irq, void *phy_dat)
{
	struct phy_device *phydev = phy_dat;

	if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
		return IRQ_NONE;

	if (phydev->drv->handle_interrupt) {
		if (phydev->drv->handle_interrupt(phydev))
			goto phy_err;
	} else {
		/* reschedule state queue work to run as soon as possible */
		phy_trigger_machine(phydev);
	}

	if (phy_clear_interrupt(phydev))
		goto phy_err;
	return IRQ_HANDLED;

phy_err:
	phy_error(phydev);
	return IRQ_NONE;
}

/**
 * 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_request_interrupt - request and enable interrupt for a PHY device
 * @phydev: target phy_device struct
 *
 * Description: Request and enable the interrupt for the given PHY.
 *   If this fails, then we set irq to PHY_POLL.
 *   This should only be called with a valid IRQ number.
 */
void phy_request_interrupt(struct phy_device *phydev)
{
	int err;

	err = request_threaded_irq(phydev->irq, NULL, phy_interrupt,
				   IRQF_ONESHOT | IRQF_SHARED,
				   phydev_name(phydev), phydev);
	if (err) {
		phydev_warn(phydev, "Error %d requesting IRQ %d, falling back to polling\n",
			    err, phydev->irq);
		phydev->irq = PHY_POLL;
	} else {
		if (phy_enable_interrupts(phydev)) {
			phydev_warn(phydev, "Can't enable interrupt, falling back to polling\n");
			phy_free_interrupt(phydev);
			phydev->irq = PHY_POLL;
		}
	}
}
EXPORT_SYMBOL(phy_request_interrupt);

/**
 * phy_free_interrupt - disable and free interrupt for a PHY device
 * @phydev: target phy_device struct
 *
 * Description: Disable and free the interrupt for the given PHY.
 *   This should only be called with a valid IRQ number.
 */
void phy_free_interrupt(struct phy_device *phydev)
{
	phy_disable_interrupts(phydev);
	free_irq(phydev->irq, phydev);
}
EXPORT_SYMBOL(phy_free_interrupt);

/**
 * phy_stop - Bring down the PHY link, and stop checking the status
 * @phydev: target phy_device struct
 */
void phy_stop(struct phy_device *phydev)
{
	if (!phy_is_started(phydev)) {
		WARN(1, "called from state %s\n",
		     phy_state_to_str(phydev->state));
		return;
	}

	mutex_lock(&phydev->lock);

	phydev->state = PHY_HALTED;

	mutex_unlock(&phydev->lock);

	phy_state_machine(&phydev->state_queue.work);
	phy_stop_machine(phydev);

	/* Cannot call flush_scheduled_work() here as desired because
	 * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
	 * 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)
{
	mutex_lock(&phydev->lock);

	if (phydev->state != PHY_READY && phydev->state != PHY_HALTED) {
		WARN(1, "called from state %s\n",
		     phy_state_to_str(phydev->state));
		goto out;
	}

	/* if phy was suspended, bring the physical link up again */
	__phy_resume(phydev);

	phydev->state = PHY_UP;

	phy_start_machine(phydev);
out:
	mutex_unlock(&phydev->lock);
}
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);
	bool needs_aneg = false, do_suspend = false;
	enum phy_state old_state;
	int err = 0;

	mutex_lock(&phydev->lock);

	old_state = phydev->state;

	switch (phydev->state) {
	case PHY_DOWN:
	case PHY_READY:
		break;
	case PHY_UP:
		needs_aneg = true;

		break;
	case PHY_NOLINK:
	case PHY_RUNNING:
		err = phy_check_link_status(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_HALTED:
		if (phydev->link) {
			phydev->link = 0;
			phy_link_down(phydev, true);
			do_suspend = true;
		}
		break;
	}

	mutex_unlock(&phydev->lock);

	if (needs_aneg)
		err = phy_start_aneg(phydev);
	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));
		if (phydev->drv && phydev->drv->link_change_notify)
			phydev->drv->link_change_notify(phydev);
	}

	/* 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().
	 *
	 * In state PHY_HALTED the PHY gets suspended, so rescheduling the
	 * state machine would be pointless and possibly error prone when
	 * called from phy_disconnect() synchronously.
	 */
	mutex_lock(&phydev->lock);
	if (phy_polling_mode(phydev) && phy_is_started(phydev))
		phy_queue_state_machine(phydev, PHY_STATE_TIME);
	mutex_unlock(&phydev->lock);
}

/**
 * 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.
 */