403 lines
13 KiB
C
403 lines
13 KiB
C
/*
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* include/linux/phy.h
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*
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* Framework and drivers for configuring and reading different PHYs
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* Based on code in sungem_phy.c and gianfar_phy.c
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*
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* Author: Andy Fleming
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*
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* Copyright (c) 2004 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#ifndef __PHY_H
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#define __PHY_H
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/ethtool.h>
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#include <linux/mii.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#define PHY_BASIC_FEATURES (SUPPORTED_10baseT_Half | \
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SUPPORTED_10baseT_Full | \
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SUPPORTED_100baseT_Half | \
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SUPPORTED_100baseT_Full | \
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SUPPORTED_Autoneg | \
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SUPPORTED_TP | \
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SUPPORTED_MII)
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#define PHY_GBIT_FEATURES (PHY_BASIC_FEATURES | \
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SUPPORTED_1000baseT_Half | \
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SUPPORTED_1000baseT_Full)
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/* Set phydev->irq to PHY_POLL if interrupts are not supported,
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* or not desired for this PHY. Set to PHY_IGNORE_INTERRUPT if
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* the attached driver handles the interrupt
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*/
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#define PHY_POLL -1
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#define PHY_IGNORE_INTERRUPT -2
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#define PHY_HAS_INTERRUPT 0x00000001
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#define PHY_HAS_MAGICANEG 0x00000002
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/* Interface Mode definitions */
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typedef enum {
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PHY_INTERFACE_MODE_MII,
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PHY_INTERFACE_MODE_GMII,
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PHY_INTERFACE_MODE_SGMII,
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PHY_INTERFACE_MODE_TBI,
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PHY_INTERFACE_MODE_RMII,
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PHY_INTERFACE_MODE_RGMII,
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PHY_INTERFACE_MODE_RTBI
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} phy_interface_t;
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#define MII_BUS_MAX 4
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#define PHY_INIT_TIMEOUT 100000
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#define PHY_STATE_TIME 1
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#define PHY_FORCE_TIMEOUT 10
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#define PHY_AN_TIMEOUT 10
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#define PHY_MAX_ADDR 32
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/* Used when trying to connect to a specific phy (mii bus id:phy device id) */
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#define PHY_ID_FMT "%x:%02x"
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/* The Bus class for PHYs. Devices which provide access to
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* PHYs should register using this structure */
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struct mii_bus {
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const char *name;
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int id;
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void *priv;
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int (*read)(struct mii_bus *bus, int phy_id, int regnum);
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int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
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int (*reset)(struct mii_bus *bus);
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/* A lock to ensure that only one thing can read/write
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* the MDIO bus at a time */
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spinlock_t mdio_lock;
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struct device *dev;
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/* list of all PHYs on bus */
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struct phy_device *phy_map[PHY_MAX_ADDR];
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/* Phy addresses to be ignored when probing */
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u32 phy_mask;
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/* Pointer to an array of interrupts, each PHY's
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* interrupt at the index matching its address */
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int *irq;
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};
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#define PHY_INTERRUPT_DISABLED 0x0
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#define PHY_INTERRUPT_ENABLED 0x80000000
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/* PHY state machine states:
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*
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* DOWN: PHY device and driver are not ready for anything. probe
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* should be called if and only if the PHY is in this state,
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* given that the PHY device exists.
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* - PHY driver probe function will, depending on the PHY, set
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* the state to STARTING or READY
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*
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* STARTING: PHY device is coming up, and the ethernet driver is
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* not ready. PHY drivers may set this in the probe function.
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* If they do, they are responsible for making sure the state is
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* eventually set to indicate whether the PHY is UP or READY,
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* depending on the state when the PHY is done starting up.
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* - PHY driver will set the state to READY
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* - start will set the state to PENDING
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*
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* READY: PHY is ready to send and receive packets, but the
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* controller is not. By default, PHYs which do not implement
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* probe will be set to this state by phy_probe(). If the PHY
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* driver knows the PHY is ready, and the PHY state is STARTING,
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* then it sets this STATE.
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* - start will set the state to UP
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*
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* PENDING: PHY device is coming up, but the ethernet driver is
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* ready. phy_start will set this state if the PHY state is
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* STARTING.
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* - PHY driver will set the state to UP when the PHY is ready
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*
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* UP: The PHY and attached device are ready to do work.
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* Interrupts should be started here.
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* - timer moves to AN
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*
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* AN: The PHY is currently negotiating the link state. Link is
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* therefore down for now. phy_timer will set this state when it
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* detects the state is UP. config_aneg will set this state
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* whenever called with phydev->autoneg set to AUTONEG_ENABLE.
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* - If autonegotiation finishes, but there's no link, it sets
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* the state to NOLINK.
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* - If aneg finishes with link, it sets the state to RUNNING,
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* and calls adjust_link
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* - If autonegotiation did not finish after an arbitrary amount
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* of time, autonegotiation should be tried again if the PHY
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* supports "magic" autonegotiation (back to AN)
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* - If it didn't finish, and no magic_aneg, move to FORCING.
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*
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* NOLINK: PHY is up, but not currently plugged in.
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* - If the timer notes that the link comes back, we move to RUNNING
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* - config_aneg moves to AN
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* - phy_stop moves to HALTED
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*
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* FORCING: PHY is being configured with forced settings
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* - if link is up, move to RUNNING
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* - If link is down, we drop to the next highest setting, and
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* retry (FORCING) after a timeout
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* - phy_stop moves to HALTED
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*
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* RUNNING: PHY is currently up, running, and possibly sending
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* and/or receiving packets
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* - timer will set CHANGELINK if we're polling (this ensures the
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* link state is polled every other cycle of this state machine,
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* which makes it every other second)
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* - irq will set CHANGELINK
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* - config_aneg will set AN
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* - phy_stop moves to HALTED
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*
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* CHANGELINK: PHY experienced a change in link state
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* - timer moves to RUNNING if link
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* - timer moves to NOLINK if the link is down
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* - phy_stop moves to HALTED
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*
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* HALTED: PHY is up, but no polling or interrupts are done. Or
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* PHY is in an error state.
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*
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* - phy_start moves to RESUMING
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*
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* RESUMING: PHY was halted, but now wants to run again.
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* - If we are forcing, or aneg is done, timer moves to RUNNING
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* - If aneg is not done, timer moves to AN
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* - phy_stop moves to HALTED
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*/
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enum phy_state {
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PHY_DOWN=0,
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PHY_STARTING,
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PHY_READY,
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PHY_PENDING,
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PHY_UP,
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PHY_AN,
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PHY_RUNNING,
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PHY_NOLINK,
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PHY_FORCING,
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PHY_CHANGELINK,
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PHY_HALTED,
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PHY_RESUMING
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};
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/* phy_device: An instance of a PHY
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*
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* drv: Pointer to the driver for this PHY instance
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* bus: Pointer to the bus this PHY is on
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* dev: driver model device structure for this PHY
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* phy_id: UID for this device found during discovery
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* state: state of the PHY for management purposes
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* dev_flags: Device-specific flags used by the PHY driver.
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* addr: Bus address of PHY
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* link_timeout: The number of timer firings to wait before the
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* giving up on the current attempt at acquiring a link
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* irq: IRQ number of the PHY's interrupt (-1 if none)
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* phy_timer: The timer for handling the state machine
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* phy_queue: A work_queue for the interrupt
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* attached_dev: The attached enet driver's device instance ptr
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* adjust_link: Callback for the enet controller to respond to
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* changes in the link state.
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* adjust_state: Callback for the enet driver to respond to
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* changes in the state machine.
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*
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* speed, duplex, pause, supported, advertising, and
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* autoneg are used like in mii_if_info
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*
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* interrupts currently only supports enabled or disabled,
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* but could be changed in the future to support enabling
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* and disabling specific interrupts
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*
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* Contains some infrastructure for polling and interrupt
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* handling, as well as handling shifts in PHY hardware state
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*/
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struct phy_device {
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/* Information about the PHY type */
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/* And management functions */
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struct phy_driver *drv;
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struct mii_bus *bus;
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struct device dev;
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u32 phy_id;
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enum phy_state state;
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u32 dev_flags;
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phy_interface_t interface;
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/* Bus address of the PHY (0-32) */
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int addr;
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/* forced speed & duplex (no autoneg)
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* partner speed & duplex & pause (autoneg)
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*/
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int speed;
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int duplex;
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int pause;
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int asym_pause;
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/* The most recently read link state */
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int link;
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/* Enabled Interrupts */
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u32 interrupts;
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/* Union of PHY and Attached devices' supported modes */
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/* See mii.h for more info */
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u32 supported;
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u32 advertising;
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int autoneg;
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int link_timeout;
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/* Interrupt number for this PHY
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* -1 means no interrupt */
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int irq;
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/* private data pointer */
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/* For use by PHYs to maintain extra state */
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void *priv;
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/* Interrupt and Polling infrastructure */
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struct work_struct phy_queue;
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struct timer_list phy_timer;
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spinlock_t lock;
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struct net_device *attached_dev;
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void (*adjust_link)(struct net_device *dev);
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void (*adjust_state)(struct net_device *dev);
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};
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#define to_phy_device(d) container_of(d, struct phy_device, dev)
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/* struct phy_driver: Driver structure for a particular PHY type
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*
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* phy_id: The result of reading the UID registers of this PHY
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* type, and ANDing them with the phy_id_mask. This driver
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* only works for PHYs with IDs which match this field
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* name: The friendly name of this PHY type
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* phy_id_mask: Defines the important bits of the phy_id
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* features: A list of features (speed, duplex, etc) supported
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* by this PHY
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* flags: A bitfield defining certain other features this PHY
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* supports (like interrupts)
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*
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* The drivers must implement config_aneg and read_status. All
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* other functions are optional. Note that none of these
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* functions should be called from interrupt time. The goal is
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* for the bus read/write functions to be able to block when the
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* bus transaction is happening, and be freed up by an interrupt
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* (The MPC85xx has this ability, though it is not currently
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* supported in the driver).
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*/
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struct phy_driver {
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u32 phy_id;
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char *name;
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unsigned int phy_id_mask;
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u32 features;
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u32 flags;
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/* Called to initialize the PHY,
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* including after a reset */
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int (*config_init)(struct phy_device *phydev);
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/* Called during discovery. Used to set
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* up device-specific structures, if any */
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int (*probe)(struct phy_device *phydev);
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/* PHY Power Management */
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int (*suspend)(struct phy_device *phydev);
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int (*resume)(struct phy_device *phydev);
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/* Configures the advertisement and resets
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* autonegotiation if phydev->autoneg is on,
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* forces the speed to the current settings in phydev
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* if phydev->autoneg is off */
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int (*config_aneg)(struct phy_device *phydev);
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/* Determines the negotiated speed and duplex */
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int (*read_status)(struct phy_device *phydev);
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/* Clears any pending interrupts */
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int (*ack_interrupt)(struct phy_device *phydev);
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/* Enables or disables interrupts */
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int (*config_intr)(struct phy_device *phydev);
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/* Clears up any memory if needed */
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void (*remove)(struct phy_device *phydev);
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struct device_driver driver;
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};
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#define to_phy_driver(d) container_of(d, struct phy_driver, driver)
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int phy_read(struct phy_device *phydev, u16 regnum);
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int phy_write(struct phy_device *phydev, u16 regnum, u16 val);
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struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
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int phy_clear_interrupt(struct phy_device *phydev);
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int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
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struct phy_device * phy_attach(struct net_device *dev,
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const char *phy_id, u32 flags, phy_interface_t interface);
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struct phy_device * phy_connect(struct net_device *dev, const char *phy_id,
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void (*handler)(struct net_device *), u32 flags,
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phy_interface_t interface);
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void phy_disconnect(struct phy_device *phydev);
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void phy_detach(struct phy_device *phydev);
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void phy_start(struct phy_device *phydev);
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void phy_stop(struct phy_device *phydev);
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int phy_start_aneg(struct phy_device *phydev);
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int mdiobus_register(struct mii_bus *bus);
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void mdiobus_unregister(struct mii_bus *bus);
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void phy_sanitize_settings(struct phy_device *phydev);
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int phy_stop_interrupts(struct phy_device *phydev);
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static inline int phy_read_status(struct phy_device *phydev) {
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return phydev->drv->read_status(phydev);
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}
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int genphy_config_advert(struct phy_device *phydev);
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int genphy_setup_forced(struct phy_device *phydev);
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int genphy_restart_aneg(struct phy_device *phydev);
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int genphy_config_aneg(struct phy_device *phydev);
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int genphy_update_link(struct phy_device *phydev);
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int genphy_read_status(struct phy_device *phydev);
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void phy_driver_unregister(struct phy_driver *drv);
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int phy_driver_register(struct phy_driver *new_driver);
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void phy_prepare_link(struct phy_device *phydev,
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void (*adjust_link)(struct net_device *));
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void phy_start_machine(struct phy_device *phydev,
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void (*handler)(struct net_device *));
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void phy_stop_machine(struct phy_device *phydev);
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int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
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int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
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int phy_mii_ioctl(struct phy_device *phydev,
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struct mii_ioctl_data *mii_data, int cmd);
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int phy_start_interrupts(struct phy_device *phydev);
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void phy_print_status(struct phy_device *phydev);
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struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id);
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extern struct bus_type mdio_bus_type;
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#endif /* __PHY_H */
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