include/linux/phy.h

   1 /*
   2  * include/linux/phy.h
   3  *
   4  * Framework and drivers for configuring and reading different PHYs
   5  * Based on code in sungem_phy.c and gianfar_phy.c
   6  *
   7  * Author: Andy Fleming
   8  *
   9  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17
  18 #ifndef __PHY_H
  19 #define __PHY_H
  20
  21 #include <linux/spinlock.h>
  22 #include <linux/device.h>
  23
  24 #define PHY_BASIC_FEATURES      (SUPPORTED_10baseT_Half | \
  25                                  SUPPORTED_10baseT_Full | \
  26                                  SUPPORTED_100baseT_Half | \
  27                                  SUPPORTED_100baseT_Full | \
  28                                  SUPPORTED_Autoneg | \
  29                                  SUPPORTED_TP | \
  30                                  SUPPORTED_MII)
  31
  32 #define PHY_GBIT_FEATURES       (PHY_BASIC_FEATURES | \
  33                                  SUPPORTED_1000baseT_Half | \
  34                                  SUPPORTED_1000baseT_Full)
  35
  36 /* Set phydev->irq to PHY_POLL if interrupts are not supported,
  37  * or not desired for this PHY.  Set to PHY_IGNORE_INTERRUPT if
  38  * the attached driver handles the interrupt
  39  */
  40 #define PHY_POLL                -1
  41 #define PHY_IGNORE_INTERRUPT    -2
  42
  43 #define PHY_HAS_INTERRUPT       0x00000001
  44 #define PHY_HAS_MAGICANEG       0x00000002
  45
  46 #define MII_BUS_MAX 4
  47
  48
  49 #define PHY_INIT_TIMEOUT 100000
  50 #define PHY_STATE_TIME          1
  51 #define PHY_FORCE_TIMEOUT       10
  52 #define PHY_AN_TIMEOUT          10
  53
  54 #define PHY_MAX_ADDR 32
  55
  56 /* The Bus class for PHYs.  Devices which provide access to
  57  * PHYs should register using this structure */
  58 struct mii_bus {
  59         const char *name;
  60         int id;
  61         void *priv;
  62         int (*read)(struct mii_bus *bus, int phy_id, int regnum);
  63         int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
  64         int (*reset)(struct mii_bus *bus);
  65
  66         /* A lock to ensure that only one thing can read/write
  67          * the MDIO bus at a time */
  68         spinlock_t mdio_lock;
  69
  70         struct device *dev;
  71
  72         /* list of all PHYs on bus */
  73         struct phy_device *phy_map[PHY_MAX_ADDR];
  74
  75         /* Phy addresses to be ignored when probing */
  76         u32 phy_mask;
  77
  78         /* Pointer to an array of interrupts, each PHY's
  79          * interrupt at the index matching its address */
  80         int *irq;
  81 };
  82
  83 #define PHY_INTERRUPT_DISABLED 0x0
  84 #define PHY_INTERRUPT_ENABLED 0x80000000
  85
  86 /* PHY state machine states:
  87  *
  88  * DOWN: PHY device and driver are not ready for anything.  probe
  89  * should be called if and only if the PHY is in this state,
  90  * given that the PHY device exists.
  91  * - PHY driver probe function will, depending on the PHY, set
  92  * the state to STARTING or READY
  93  *
  94  * STARTING:  PHY device is coming up, and the ethernet driver is
  95  * not ready.  PHY drivers may set this in the probe function.
  96  * If they do, they are responsible for making sure the state is
  97  * eventually set to indicate whether the PHY is UP or READY,
  98  * depending on the state when the PHY is done starting up.
  99  * - PHY driver will set the state to READY
 100  * - start will set the state to PENDING
 101  *
 102  * READY: PHY is ready to send and receive packets, but the
 103  * controller is not.  By default, PHYs which do not implement
 104  * probe will be set to this state by phy_probe().  If the PHY
 105  * driver knows the PHY is ready, and the PHY state is STARTING,
 106  * then it sets this STATE.
 107  * - start will set the state to UP
 108  *
 109  * PENDING: PHY device is coming up, but the ethernet driver is
 110  * ready.  phy_start will set this state if the PHY state is
 111  * STARTING.
 112  * - PHY driver will set the state to UP when the PHY is ready
 113  *
 114  * UP: The PHY and attached device are ready to do work.
 115  * Interrupts should be started here.
 116  * - timer moves to AN
 117  *
 118  * AN: The PHY is currently negotiating the link state.  Link is
 119  * therefore down for now.  phy_timer will set this state when it
 120  * detects the state is UP.  config_aneg will set this state
 121  * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
 122  * - If autonegotiation finishes, but there's no link, it sets
 123  *   the state to NOLINK.
 124  * - If aneg finishes with link, it sets the state to RUNNING,
 125  *   and calls adjust_link
 126  * - If autonegotiation did not finish after an arbitrary amount
 127  *   of time, autonegotiation should be tried again if the PHY
 128  *   supports "magic" autonegotiation (back to AN)
 129  * - If it didn't finish, and no magic_aneg, move to FORCING.
 130  *
 131  * NOLINK: PHY is up, but not currently plugged in.
 132  * - If the timer notes that the link comes back, we move to RUNNING
 133  * - config_aneg moves to AN
 134  * - phy_stop moves to HALTED
 135  *
 136  * FORCING: PHY is being configured with forced settings
 137  * - if link is up, move to RUNNING
 138  * - If link is down, we drop to the next highest setting, and
 139  *   retry (FORCING) after a timeout
 140  * - phy_stop moves to HALTED
 141  *
 142  * RUNNING: PHY is currently up, running, and possibly sending
 143  * and/or receiving packets
 144  * - timer will set CHANGELINK if we're polling (this ensures the
 145  *   link state is polled every other cycle of this state machine,
 146  *   which makes it every other second)
 147  * - irq will set CHANGELINK
 148  * - config_aneg will set AN
 149  * - phy_stop moves to HALTED
 150  *
 151  * CHANGELINK: PHY experienced a change in link state
 152  * - timer moves to RUNNING if link
 153  * - timer moves to NOLINK if the link is down
 154  * - phy_stop moves to HALTED
 155  *
 156  * HALTED: PHY is up, but no polling or interrupts are done. Or
 157  * PHY is in an error state.
 158  *
 159  * - phy_start moves to RESUMING
 160  *
 161  * RESUMING: PHY was halted, but now wants to run again.
 162  * - If we are forcing, or aneg is done, timer moves to RUNNING
 163  * - If aneg is not done, timer moves to AN
 164  * - phy_stop moves to HALTED
 165  */
 166 enum phy_state {
 167         PHY_DOWN=0,
 168         PHY_STARTING,
 169         PHY_READY,
 170         PHY_PENDING,
 171         PHY_UP,
 172         PHY_AN,
 173         PHY_RUNNING,
 174         PHY_NOLINK,
 175         PHY_FORCING,
 176         PHY_CHANGELINK,
 177         PHY_HALTED,
 178         PHY_RESUMING
 179 };
 180
 181 /* phy_device: An instance of a PHY
 182  *
 183  * drv: Pointer to the driver for this PHY instance
 184  * bus: Pointer to the bus this PHY is on
 185  * dev: driver model device structure for this PHY
 186  * phy_id: UID for this device found during discovery
 187  * state: state of the PHY for management purposes
 188  * dev_flags: Device-specific flags used by the PHY driver.
 189  * addr: Bus address of PHY
 190  * link_timeout: The number of timer firings to wait before the
 191  * giving up on the current attempt at acquiring a link
 192  * irq: IRQ number of the PHY's interrupt (-1 if none)
 193  * phy_timer: The timer for handling the state machine
 194  * phy_queue: A work_queue for the interrupt
 195  * attached_dev: The attached enet driver's device instance ptr
 196  * adjust_link: Callback for the enet controller to respond to
 197  * changes in the link state.
 198  * adjust_state: Callback for the enet driver to respond to
 199  * changes in the state machine.
 200  *
 201  * speed, duplex, pause, supported, advertising, and
 202  * autoneg are used like in mii_if_info
 203  *
 204  * interrupts currently only supports enabled or disabled,
 205  * but could be changed in the future to support enabling
 206  * and disabling specific interrupts
 207  *
 208  * Contains some infrastructure for polling and interrupt
 209  * handling, as well as handling shifts in PHY hardware state
 210  */
 211 struct phy_device {
 212         /* Information about the PHY type */
 213         /* And management functions */
 214         struct phy_driver *drv;
 215
 216         struct mii_bus *bus;
 217
 218         struct device dev;
 219
 220         u32 phy_id;
 221
 222         enum phy_state state;
 223
 224         u32 dev_flags;
 225
 226         /* Bus address of the PHY (0-32) */
 227         int addr;
 228
 229         /* forced speed & duplex (no autoneg)
 230          * partner speed & duplex & pause (autoneg)
 231          */
 232         int speed;
 233         int duplex;
 234         int pause;
 235         int asym_pause;
 236
 237         /* The most recently read link state */
 238         int link;
 239
 240         /* Enabled Interrupts */
 241         u32 interrupts;
 242
 243         /* Union of PHY and Attached devices' supported modes */
 244         /* See mii.h for more info */
 245         u32 supported;
 246         u32 advertising;
 247
 248         int autoneg;
 249
 250         int link_timeout;
 251
 252         /* Interrupt number for this PHY
 253          * -1 means no interrupt */
 254         int irq;
 255
 256         /* private data pointer */
 257         /* For use by PHYs to maintain extra state */
 258         void *priv;
 259
 260         /* Interrupt and Polling infrastructure */
 261         struct work_struct phy_queue;
 262         struct timer_list phy_timer;
 263
 264         spinlock_t lock;
 265
 266         struct net_device *attached_dev;
 267
 268         void (*adjust_link)(struct net_device *dev);
 269
 270         void (*adjust_state)(struct net_device *dev);
 271 };
 272 #define to_phy_device(d) container_of(d, struct phy_device, dev)
 273
 274 /* struct phy_driver: Driver structure for a particular PHY type
 275  *
 276  * phy_id: The result of reading the UID registers of this PHY
 277  *   type, and ANDing them with the phy_id_mask.  This driver
 278  *   only works for PHYs with IDs which match this field
 279  * name: The friendly name of this PHY type
 280  * phy_id_mask: Defines the important bits of the phy_id
 281  * features: A list of features (speed, duplex, etc) supported
 282  *   by this PHY
 283  * flags: A bitfield defining certain other features this PHY
 284  *   supports (like interrupts)
 285  *
 286  * The drivers must implement config_aneg and read_status.  All
 287  * other functions are optional. Note that none of these
 288  * functions should be called from interrupt time.  The goal is
 289  * for the bus read/write functions to be able to block when the
 290  * bus transaction is happening, and be freed up by an interrupt
 291  * (The MPC85xx has this ability, though it is not currently
 292  * supported in the driver).
 293  */
 294 struct phy_driver {
 295         u32 phy_id;
 296         char *name;
 297         unsigned int phy_id_mask;
 298         u32 features;
 299         u32 flags;
 300
 301         /* Called to initialize the PHY,
 302          * including after a reset */
 303         int (*config_init)(struct phy_device *phydev);
 304
 305         /* Called during discovery.  Used to set
 306          * up device-specific structures, if any */
 307         int (*probe)(struct phy_device *phydev);
 308
 309         /* PHY Power Management */
 310         int (*suspend)(struct phy_device *phydev);
 311         int (*resume)(struct phy_device *phydev);
 312
 313         /* Configures the advertisement and resets
 314          * autonegotiation if phydev->autoneg is on,
 315          * forces the speed to the current settings in phydev
 316          * if phydev->autoneg is off */
 317         int (*config_aneg)(struct phy_device *phydev);
 318
 319         /* Determines the negotiated speed and duplex */
 320         int (*read_status)(struct phy_device *phydev);
 321
 322         /* Clears any pending interrupts */
 323         int (*ack_interrupt)(struct phy_device *phydev);
 324
 325         /* Enables or disables interrupts */
 326         int (*config_intr)(struct phy_device *phydev);
 327
 328         /* Clears up any memory if needed */
 329         void (*remove)(struct phy_device *phydev);
 330
 331         struct device_driver driver;
 332 };
 333 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
 334
 335 int phy_read(struct phy_device *phydev, u16 regnum);
 336 int phy_write(struct phy_device *phydev, u16 regnum, u16 val);
 337 struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
 338 int phy_clear_interrupt(struct phy_device *phydev);
 339 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
 340 struct phy_device * phy_attach(struct net_device *dev,
 341                 const char *phy_id, u32 flags);
 342 struct phy_device * phy_connect(struct net_device *dev, const char *phy_id,
 343                 void (*handler)(struct net_device *), u32 flags);
 344 void phy_disconnect(struct phy_device *phydev);
 345 void phy_detach(struct phy_device *phydev);
 346 void phy_start(struct phy_device *phydev);
 347 void phy_stop(struct phy_device *phydev);
 348 int phy_start_aneg(struct phy_device *phydev);
 349
 350 int mdiobus_register(struct mii_bus *bus);
 351 void mdiobus_unregister(struct mii_bus *bus);
 352 void phy_sanitize_settings(struct phy_device *phydev);
 353 int phy_stop_interrupts(struct phy_device *phydev);
 354
 355 static inline int phy_read_status(struct phy_device *phydev) {
 356         return phydev->drv->read_status(phydev);
 357 }
 358
 359 int genphy_config_advert(struct phy_device *phydev);
 360 int genphy_setup_forced(struct phy_device *phydev);
 361 int genphy_restart_aneg(struct phy_device *phydev);
 362 int genphy_config_aneg(struct phy_device *phydev);
 363 int genphy_update_link(struct phy_device *phydev);
 364 int genphy_read_status(struct phy_device *phydev);
 365 void phy_driver_unregister(struct phy_driver *drv);
 366 int phy_driver_register(struct phy_driver *new_driver);
 367 void phy_prepare_link(struct phy_device *phydev,
 368                 void (*adjust_link)(struct net_device *));
 369 void phy_start_machine(struct phy_device *phydev,
 370                 void (*handler)(struct net_device *));
 371 void phy_stop_machine(struct phy_device *phydev);
 372 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 373 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 374 int phy_mii_ioctl(struct phy_device *phydev,
 375                 struct mii_ioctl_data *mii_data, int cmd);
 376 int phy_start_interrupts(struct phy_device *phydev);
 377 void phy_print_status(struct phy_device *phydev);
 378
 379 extern struct bus_type mdio_bus_type;
 380 #endif /* __PHY_H */