/*
   * include/linux/phy.h
   *
   * Framework and drivers for configuring and reading different PHYs
   * 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.
   *
   */
  
  #ifndef __PHY_H
  #define __PHY_H
  
  #include <linux/spinlock.h>
  #include <linux/device.h>

  #include <linux/ethtool.h>
  #include <linux/mii.h>
  #include <linux/timer.h>
  #include <linux/workqueue.h>

  #include <linux/mod_devicetable.h>

  #include <linux/atomic.h>

  #define PHY_BASIC_FEATURES	(SUPPORTED_10baseT_Half | \
  				 SUPPORTED_10baseT_Full | \
  				 SUPPORTED_100baseT_Half | \
  				 SUPPORTED_100baseT_Full | \
  				 SUPPORTED_Autoneg | \
  				 SUPPORTED_TP | \
  				 SUPPORTED_MII)
  
  #define PHY_GBIT_FEATURES	(PHY_BASIC_FEATURES | \
  				 SUPPORTED_1000baseT_Half | \
  				 SUPPORTED_1000baseT_Full)

  /*
   * Set phydev->irq to PHY_POLL if interrupts are not supported,

   * or not desired for this PHY.  Set to PHY_IGNORE_INTERRUPT if
   * the attached driver handles the interrupt
   */
  #define PHY_POLL		-1
  #define PHY_IGNORE_INTERRUPT	-2
  
  #define PHY_HAS_INTERRUPT	0x00000001
  #define PHY_HAS_MAGICANEG	0x00000002

  /* Interface Mode definitions */
  typedef enum {

  	PHY_INTERFACE_MODE_NA,

  	PHY_INTERFACE_MODE_MII,
  	PHY_INTERFACE_MODE_GMII,
  	PHY_INTERFACE_MODE_SGMII,
  	PHY_INTERFACE_MODE_TBI,
  	PHY_INTERFACE_MODE_RMII,
  	PHY_INTERFACE_MODE_RGMII,

  	PHY_INTERFACE_MODE_RGMII_ID,

  	PHY_INTERFACE_MODE_RGMII_RXID,
  	PHY_INTERFACE_MODE_RGMII_TXID,

  	PHY_INTERFACE_MODE_RTBI,
  	PHY_INTERFACE_MODE_SMII,

  } phy_interface_t;

  #define PHY_INIT_TIMEOUT	100000

  #define PHY_STATE_TIME		1
  #define PHY_FORCE_TIMEOUT	10
  #define PHY_AN_TIMEOUT		10

  #define PHY_MAX_ADDR	32

  /* Used when trying to connect to a specific phy (mii bus id:phy device id) */

  #define PHY_ID_FMT "%s:%02x"
  
  /*
   * Need to be a little smaller than phydev->dev.bus_id to leave room
   * for the ":%02x"
   */

  #define MII_BUS_ID_SIZE	(20 - 3)

  /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
     IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips. */
  #define MII_ADDR_C45 (1<<30)

  /*
   * The Bus class for PHYs.  Devices which provide access to
   * PHYs should register using this structure
   */

  struct mii_bus {
  	const char *name;

  	char id[MII_BUS_ID_SIZE];

  	void *priv;
  	int (*read)(struct mii_bus *bus, int phy_id, int regnum);
  	int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
  	int (*reset)(struct mii_bus *bus);

  	/*
  	 * A lock to ensure that only one thing can read/write
  	 * the MDIO bus at a time
  	 */

  	struct mutex mdio_lock;

  	struct device *parent;

  	enum {
  		MDIOBUS_ALLOCATED = 1,
  		MDIOBUS_REGISTERED,
  		MDIOBUS_UNREGISTERED,
  		MDIOBUS_RELEASED,
  	} state;
  	struct device dev;

  
  	/* list of all PHYs on bus */
  	struct phy_device *phy_map[PHY_MAX_ADDR];

  	/* PHY addresses to be ignored when probing */

  	u32 phy_mask;

  	/*
  	 * Pointer to an array of interrupts, each PHY's
  	 * interrupt at the index matching its address
  	 */

  	int *irq;
  };

  #define to_mii_bus(d) container_of(d, struct mii_bus, dev)

  struct mii_bus *mdiobus_alloc(void);
  int mdiobus_register(struct mii_bus *bus);
  void mdiobus_unregister(struct mii_bus *bus);
  void mdiobus_free(struct mii_bus *bus);
  struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);

  int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
  int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);

  #define PHY_INTERRUPT_DISABLED	0x0
  #define PHY_INTERRUPT_ENABLED	0x80000000

  
  /* PHY state machine states:
   *
   * DOWN: PHY device and driver are not ready for anything.  probe
   * should be called if and only if the PHY is in this state,
   * given that the PHY device exists.
   * - PHY driver probe function will, depending on the PHY, set
   * the state to STARTING or READY
   *
   * STARTING:  PHY device is coming up, and the ethernet driver is
   * not ready.  PHY drivers may set this in the probe function.
   * If they do, they are responsible for making sure the state is
   * eventually set to indicate whether the PHY is UP or READY,
   * depending on the state when the PHY is done starting up.
   * - PHY driver will set the state to READY
   * - start will set the state to PENDING
   *
   * READY: PHY is ready to send and receive packets, but the
   * controller is not.  By default, PHYs which do not implement
   * probe will be set to this state by phy_probe().  If the PHY
   * driver knows the PHY is ready, and the PHY state is STARTING,
   * then it sets this STATE.
   * - start will set the state to UP
   *
   * PENDING: PHY device is coming up, but the ethernet driver is
   * ready.  phy_start will set this state if the PHY state is
   * STARTING.
   * - PHY driver will set the state to UP when the PHY is ready
   *
   * UP: The PHY and attached device are ready to do work.
   * Interrupts should be started here.
   * - timer moves to AN
   *
   * AN: The PHY is currently negotiating the link state.  Link is
   * therefore down for now.  phy_timer will set this state when it
   * detects the state is UP.  config_aneg will set this state
   * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
   * - If autonegotiation finishes, but there's no link, it sets
   *   the state to NOLINK.
   * - If aneg finishes with link, it sets the state to RUNNING,
   *   and calls adjust_link
   * - If autonegotiation did not finish after an arbitrary amount
   *   of time, autonegotiation should be tried again if the PHY
   *   supports "magic" autonegotiation (back to AN)
   * - If it didn't finish, and no magic_aneg, move to FORCING.
   *
   * NOLINK: PHY is up, but not currently plugged in.
   * - If the timer notes that the link comes back, we move to RUNNING
   * - config_aneg moves to AN
   * - phy_stop moves to HALTED
   *
   * FORCING: PHY is being configured with forced settings
   * - if link is up, move to RUNNING
   * - If link is down, we drop to the next highest setting, and
   *   retry (FORCING) after a timeout
   * - phy_stop moves to HALTED
   *
   * RUNNING: PHY is currently up, running, and possibly sending
   * and/or receiving packets
   * - timer will set CHANGELINK if we're polling (this ensures the
   *   link state is polled every other cycle of this state machine,
   *   which makes it every other second)
   * - irq will set CHANGELINK
   * - config_aneg will set AN
   * - phy_stop moves to HALTED
   *
   * CHANGELINK: PHY experienced a change in link state
   * - timer moves to RUNNING if link
   * - timer moves to NOLINK if the link is down
   * - phy_stop moves to HALTED
   *
   * HALTED: PHY is up, but no polling or interrupts are done. Or
   * PHY is in an error state.
   *
   * - phy_start moves to RESUMING
   *
   * RESUMING: PHY was halted, but now wants to run again.
   * - If we are forcing, or aneg is done, timer moves to RUNNING
   * - If aneg is not done, timer moves to AN
   * - phy_stop moves to HALTED
   */
  enum phy_state {
  	PHY_DOWN=0,
  	PHY_STARTING,
  	PHY_READY,
  	PHY_PENDING,
  	PHY_UP,
  	PHY_AN,
  	PHY_RUNNING,
  	PHY_NOLINK,
  	PHY_FORCING,
  	PHY_CHANGELINK,
  	PHY_HALTED,
  	PHY_RESUMING
  };

  struct sk_buff;

  /* phy_device: An instance of a PHY
   *
   * drv: Pointer to the driver for this PHY instance
   * bus: Pointer to the bus this PHY is on
   * dev: driver model device structure for this PHY
   * phy_id: UID for this device found during discovery
   * state: state of the PHY for management purposes
   * dev_flags: Device-specific flags used by the PHY driver.
   * addr: Bus address of PHY
   * link_timeout: The number of timer firings to wait before the
   * giving up on the current attempt at acquiring a link
   * irq: IRQ number of the PHY's interrupt (-1 if none)
   * phy_timer: The timer for handling the state machine
   * phy_queue: A work_queue for the interrupt
   * attached_dev: The attached enet driver's device instance ptr
   * adjust_link: Callback for the enet controller to respond to
   * changes in the link state.
   * adjust_state: Callback for the enet driver to respond to
   * changes in the state machine.
   *
   * speed, duplex, pause, supported, advertising, and
   * autoneg are used like in mii_if_info
   *
   * interrupts currently only supports enabled or disabled,
   * but could be changed in the future to support enabling
   * and disabling specific interrupts
   *
   * Contains some infrastructure for polling and interrupt
   * handling, as well as handling shifts in PHY hardware state
   */
  struct phy_device {
  	/* Information about the PHY type */
  	/* And management functions */
  	struct phy_driver *drv;
  
  	struct mii_bus *bus;
  
  	struct device dev;
  
  	u32 phy_id;
  
  	enum phy_state state;
  
  	u32 dev_flags;

  	phy_interface_t interface;

  	/* Bus address of the PHY (0-31) */

  	int addr;

  	/*
  	 * forced speed & duplex (no autoneg)

  	 * partner speed & duplex & pause (autoneg)
  	 */
  	int speed;
  	int duplex;
  	int pause;
  	int asym_pause;
  
  	/* The most recently read link state */
  	int link;
  
  	/* Enabled Interrupts */
  	u32 interrupts;
  
  	/* Union of PHY and Attached devices' supported modes */
  	/* See mii.h for more info */
  	u32 supported;
  	u32 advertising;
  
  	int autoneg;
  
  	int link_timeout;

  	/*
  	 * Interrupt number for this PHY
  	 * -1 means no interrupt
  	 */

  	int irq;
  
  	/* private data pointer */
  	/* For use by PHYs to maintain extra state */
  	void *priv;
  
  	/* Interrupt and Polling infrastructure */
  	struct work_struct phy_queue;

  	struct delayed_work state_queue;

  	atomic_t irq_disable;

  	struct mutex lock;

  
  	struct net_device *attached_dev;
  
  	void (*adjust_link)(struct net_device *dev);
  
  	void (*adjust_state)(struct net_device *dev);
  };
  #define to_phy_device(d) container_of(d, struct phy_device, dev)
  
  /* struct phy_driver: Driver structure for a particular PHY type
   *
   * phy_id: The result of reading the UID registers of this PHY
   *   type, and ANDing them with the phy_id_mask.  This driver
   *   only works for PHYs with IDs which match this field
   * name: The friendly name of this PHY type
   * phy_id_mask: Defines the important bits of the phy_id
   * features: A list of features (speed, duplex, etc) supported
   *   by this PHY
   * flags: A bitfield defining certain other features this PHY
   *   supports (like interrupts)
   *
   * The drivers must implement config_aneg and read_status.  All
   * other functions are optional. Note that none of these
   * functions should be called from interrupt time.  The goal is
   * for the bus read/write functions to be able to block when the
   * bus transaction is happening, and be freed up by an interrupt
   * (The MPC85xx has this ability, though it is not currently
   * supported in the driver).
   */
  struct phy_driver {
  	u32 phy_id;
  	char *name;
  	unsigned int phy_id_mask;
  	u32 features;
  	u32 flags;

  	/*
  	 * Called to initialize the PHY,
  	 * including after a reset
  	 */

  	int (*config_init)(struct phy_device *phydev);

  	/*
  	 * Called during discovery.  Used to set
  	 * up device-specific structures, if any
  	 */

  	int (*probe)(struct phy_device *phydev);
  
  	/* PHY Power Management */
  	int (*suspend)(struct phy_device *phydev);
  	int (*resume)(struct phy_device *phydev);

  	/*
  	 * Configures the advertisement and resets

  	 * autonegotiation if phydev->autoneg is on,
  	 * forces the speed to the current settings in phydev

  	 * if phydev->autoneg is off
  	 */

  	int (*config_aneg)(struct phy_device *phydev);
  
  	/* Determines the negotiated speed and duplex */
  	int (*read_status)(struct phy_device *phydev);
  
  	/* Clears any pending interrupts */
  	int (*ack_interrupt)(struct phy_device *phydev);
  
  	/* Enables or disables interrupts */
  	int (*config_intr)(struct phy_device *phydev);

  	/*
  	 * Checks if the PHY generated an interrupt.
  	 * For multi-PHY devices with shared PHY interrupt pin
  	 */
  	int (*did_interrupt)(struct phy_device *phydev);

  	/* Clears up any memory if needed */
  	void (*remove)(struct phy_device *phydev);

  	/* Handles SIOCSHWTSTAMP ioctl for hardware time stamping. */
  	int  (*hwtstamp)(struct phy_device *phydev, struct ifreq *ifr);
  
  	/*
  	 * Requests a Rx timestamp for 'skb'. If the skb is accepted,
  	 * the phy driver promises to deliver it using netif_rx() as
  	 * soon as a timestamp becomes available. One of the
  	 * PTP_CLASS_ values is passed in 'type'. The function must
  	 * return true if the skb is accepted for delivery.
  	 */
  	bool (*rxtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
  
  	/*
  	 * Requests a Tx timestamp for 'skb'. The phy driver promises

  	 * to deliver it using skb_complete_tx_timestamp() as soon as a

  	 * timestamp becomes available. One of the PTP_CLASS_ values
  	 * is passed in 'type'.
  	 */
  	void (*txtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);

  	struct device_driver driver;
  };
  #define to_phy_driver(d) container_of(d, struct phy_driver, driver)

  #define PHY_ANY_ID "MATCH ANY PHY"
  #define PHY_ANY_UID 0xffffffff
  
  /* A Structure for boards to register fixups with the PHY Lib */
  struct phy_fixup {
  	struct list_head list;

  	char bus_id[20];

  	u32 phy_uid;
  	u32 phy_uid_mask;
  	int (*run)(struct phy_device *phydev);
  };

  /**
   * phy_read - Convenience function for reading a given PHY register
   * @phydev: the phy_device struct
   * @regnum: register number to read
   *
   * NOTE: MUST NOT be called from interrupt context,
   * because the bus read/write functions may wait for an interrupt
   * to conclude the operation.
   */

  static inline int phy_read(struct phy_device *phydev, u32 regnum)

  {
  	return mdiobus_read(phydev->bus, phydev->addr, regnum);
  }
  
  /**
   * phy_write - Convenience function for writing a given PHY register
   * @phydev: the phy_device struct
   * @regnum: register number to write
   * @val: value to write to @regnum
   *
   * NOTE: MUST NOT be called from interrupt context,
   * because the bus read/write functions may wait for an interrupt
   * to conclude the operation.
   */

  static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)

  {
  	return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
  }

  int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);

  struct phy_device* get_phy_device(struct mii_bus *bus, int addr);

  int phy_device_register(struct phy_device *phy);

  int phy_init_hw(struct phy_device *phydev);

  struct phy_device * phy_attach(struct net_device *dev,

  		const char *bus_id, u32 flags, phy_interface_t interface);

  struct phy_device *phy_find_first(struct mii_bus *bus);

  int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
  		void (*handler)(struct net_device *), u32 flags,
  		phy_interface_t interface);

  struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,

  		void (*handler)(struct net_device *), u32 flags,
  		phy_interface_t interface);

  void phy_disconnect(struct phy_device *phydev);
  void phy_detach(struct phy_device *phydev);
  void phy_start(struct phy_device *phydev);
  void phy_stop(struct phy_device *phydev);
  int phy_start_aneg(struct phy_device *phydev);

  int phy_stop_interrupts(struct phy_device *phydev);

  
  static inline int phy_read_status(struct phy_device *phydev) {
  	return phydev->drv->read_status(phydev);
  }

  int genphy_restart_aneg(struct phy_device *phydev);
  int genphy_config_aneg(struct phy_device *phydev);
  int genphy_update_link(struct phy_device *phydev);
  int genphy_read_status(struct phy_device *phydev);

  int genphy_suspend(struct phy_device *phydev);
  int genphy_resume(struct phy_device *phydev);

  void phy_driver_unregister(struct phy_driver *drv);
  int phy_driver_register(struct phy_driver *new_driver);

  void phy_state_machine(struct work_struct *work);

  void phy_start_machine(struct phy_device *phydev,
  		void (*handler)(struct net_device *));
  void phy_stop_machine(struct phy_device *phydev);
  int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
  int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
  int phy_mii_ioctl(struct phy_device *phydev,

  		struct ifreq *ifr, int cmd);

  int phy_start_interrupts(struct phy_device *phydev);
  void phy_print_status(struct phy_device *phydev);

  void phy_device_free(struct phy_device *phydev);

  int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
  		int (*run)(struct phy_device *));
  int phy_register_fixup_for_id(const char *bus_id,
  		int (*run)(struct phy_device *));
  int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
  		int (*run)(struct phy_device *));
  int phy_scan_fixups(struct phy_device *phydev);

  int __init mdio_bus_init(void);
  void mdio_bus_exit(void);

  extern struct bus_type mdio_bus_type;

  #endif /* __PHY_H */