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 #include <linux/ethtool.h>
  24 #include <linux/mii.h>
  25 #include <linux/timer.h>
  26 #include <linux/workqueue.h>
  27
  28 #include <asm/atomic.h>
  29
  30 #define PHY_BASIC_FEATURES      (SUPPORTED_10baseT_Half | \
  31                                  SUPPORTED_10baseT_Full | \
  32                                  SUPPORTED_100baseT_Half | \
  33                                  SUPPORTED_100baseT_Full | \
  34                                  SUPPORTED_Autoneg | \
  35                                  SUPPORTED_TP | \
  36                                  SUPPORTED_MII)
  37
  38 #define PHY_GBIT_FEATURES       (PHY_BASIC_FEATURES | \
  39                                  SUPPORTED_1000baseT_Half | \
  40                                  SUPPORTED_1000baseT_Full)
  41
  42 /*
  43  * Set phydev->irq to PHY_POLL if interrupts are not supported,
  44  * or not desired for this PHY.  Set to PHY_IGNORE_INTERRUPT if
  45  * the attached driver handles the interrupt
  46  */
  47 #define PHY_POLL                -1
  48 #define PHY_IGNORE_INTERRUPT    -2
  49
  50 #define PHY_HAS_INTERRUPT       0x00000001
  51 #define PHY_HAS_MAGICANEG       0x00000002
  52
  53 /* Interface Mode definitions */
  54 typedef enum {
  55         PHY_INTERFACE_MODE_MII,
  56         PHY_INTERFACE_MODE_GMII,
  57         PHY_INTERFACE_MODE_SGMII,
  58         PHY_INTERFACE_MODE_TBI,
  59         PHY_INTERFACE_MODE_RMII,
  60         PHY_INTERFACE_MODE_RGMII,
  61         PHY_INTERFACE_MODE_RGMII_ID,
  62         PHY_INTERFACE_MODE_RGMII_RXID,
  63         PHY_INTERFACE_MODE_RGMII_TXID,
  64         PHY_INTERFACE_MODE_RTBI
  65 } phy_interface_t;
  66
  67
  68 #define PHY_INIT_TIMEOUT        100000
  69 #define PHY_STATE_TIME          1
  70 #define PHY_FORCE_TIMEOUT       10
  71 #define PHY_AN_TIMEOUT          10
  72
  73 #define PHY_MAX_ADDR    32
  74
  75 /* Used when trying to connect to a specific phy (mii bus id:phy device id) */
  76 #define PHY_ID_FMT "%s:%02x"
  77
  78 /*
  79  * Need to be a little smaller than phydev->dev.bus_id to leave room
  80  * for the ":%02x"
  81  */
  82 #define MII_BUS_ID_SIZE (BUS_ID_SIZE - 3)
  83
  84 /*
  85  * The Bus class for PHYs.  Devices which provide access to
  86  * PHYs should register using this structure
  87  */
  88 struct mii_bus {
  89         const char *name;
  90         char id[MII_BUS_ID_SIZE];
  91         void *priv;
  92         int (*read)(struct mii_bus *bus, int phy_id, int regnum);
  93         int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
  94         int (*reset)(struct mii_bus *bus);
  95
  96         /*
  97          * A lock to ensure that only one thing can read/write
  98          * the MDIO bus at a time
  99          */
 100         struct mutex mdio_lock;
 101
 102         struct device *parent;
 103         enum {
 104                 MDIOBUS_ALLOCATED = 1,
 105                 MDIOBUS_REGISTERED,
 106                 MDIOBUS_UNREGISTERED,
 107                 MDIOBUS_RELEASED,
 108         } state;
 109         struct device dev;
 110
 111         /* list of all PHYs on bus */
 112         struct phy_device *phy_map[PHY_MAX_ADDR];
 113
 114         /* Phy addresses to be ignored when probing */
 115         u32 phy_mask;
 116
 117         /*
 118          * Pointer to an array of interrupts, each PHY's
 119          * interrupt at the index matching its address
 120          */
 121         int *irq;
 122 };
 123 #define to_mii_bus(d) container_of(d, struct mii_bus, dev)
 124
 125 struct mii_bus *mdiobus_alloc(void);
 126 int mdiobus_register(struct mii_bus *bus);
 127 void mdiobus_unregister(struct mii_bus *bus);
 128 void mdiobus_free(struct mii_bus *bus);
 129 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
 130 int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum);
 131 int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val);
 132
 133
 134 #define PHY_INTERRUPT_DISABLED  0x0
 135 #define PHY_INTERRUPT_ENABLED   0x80000000
 136
 137 /* PHY state machine states:
 138  *
 139  * DOWN: PHY device and driver are not ready for anything.  probe
 140  * should be called if and only if the PHY is in this state,
 141  * given that the PHY device exists.
 142  * - PHY driver probe function will, depending on the PHY, set
 143  * the state to STARTING or READY
 144  *
 145  * STARTING:  PHY device is coming up, and the ethernet driver is
 146  * not ready.  PHY drivers may set this in the probe function.
 147  * If they do, they are responsible for making sure the state is
 148  * eventually set to indicate whether the PHY is UP or READY,
 149  * depending on the state when the PHY is done starting up.
 150  * - PHY driver will set the state to READY
 151  * - start will set the state to PENDING
 152  *
 153  * READY: PHY is ready to send and receive packets, but the
 154  * controller is not.  By default, PHYs which do not implement
 155  * probe will be set to this state by phy_probe().  If the PHY
 156  * driver knows the PHY is ready, and the PHY state is STARTING,
 157  * then it sets this STATE.
 158  * - start will set the state to UP
 159  *
 160  * PENDING: PHY device is coming up, but the ethernet driver is
 161  * ready.  phy_start will set this state if the PHY state is
 162  * STARTING.
 163  * - PHY driver will set the state to UP when the PHY is ready
 164  *
 165  * UP: The PHY and attached device are ready to do work.
 166  * Interrupts should be started here.
 167  * - timer moves to AN
 168  *
 169  * AN: The PHY is currently negotiating the link state.  Link is
 170  * therefore down for now.  phy_timer will set this state when it
 171  * detects the state is UP.  config_aneg will set this state
 172  * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
 173  * - If autonegotiation finishes, but there's no link, it sets
 174  *   the state to NOLINK.
 175  * - If aneg finishes with link, it sets the state to RUNNING,
 176  *   and calls adjust_link
 177  * - If autonegotiation did not finish after an arbitrary amount
 178  *   of time, autonegotiation should be tried again if the PHY
 179  *   supports "magic" autonegotiation (back to AN)
 180  * - If it didn't finish, and no magic_aneg, move to FORCING.
 181  *
 182  * NOLINK: PHY is up, but not currently plugged in.
 183  * - If the timer notes that the link comes back, we move to RUNNING
 184  * - config_aneg moves to AN
 185  * - phy_stop moves to HALTED
 186  *
 187  * FORCING: PHY is being configured with forced settings
 188  * - if link is up, move to RUNNING
 189  * - If link is down, we drop to the next highest setting, and
 190  *   retry (FORCING) after a timeout
 191  * - phy_stop moves to HALTED
 192  *
 193  * RUNNING: PHY is currently up, running, and possibly sending
 194  * and/or receiving packets
 195  * - timer will set CHANGELINK if we're polling (this ensures the
 196  *   link state is polled every other cycle of this state machine,
 197  *   which makes it every other second)
 198  * - irq will set CHANGELINK
 199  * - config_aneg will set AN
 200  * - phy_stop moves to HALTED
 201  *
 202  * CHANGELINK: PHY experienced a change in link state
 203  * - timer moves to RUNNING if link
 204  * - timer moves to NOLINK if the link is down
 205  * - phy_stop moves to HALTED
 206  *
 207  * HALTED: PHY is up, but no polling or interrupts are done. Or
 208  * PHY is in an error state.
 209  *
 210  * - phy_start moves to RESUMING
 211  *
 212  * RESUMING: PHY was halted, but now wants to run again.
 213  * - If we are forcing, or aneg is done, timer moves to RUNNING
 214  * - If aneg is not done, timer moves to AN
 215  * - phy_stop moves to HALTED
 216  */
 217 enum phy_state {
 218         PHY_DOWN=0,
 219         PHY_STARTING,
 220         PHY_READY,
 221         PHY_PENDING,
 222         PHY_UP,
 223         PHY_AN,
 224         PHY_RUNNING,
 225         PHY_NOLINK,
 226         PHY_FORCING,
 227         PHY_CHANGELINK,
 228         PHY_HALTED,
 229         PHY_RESUMING
 230 };
 231
 232 /* phy_device: An instance of a PHY
 233  *
 234  * drv: Pointer to the driver for this PHY instance
 235  * bus: Pointer to the bus this PHY is on
 236  * dev: driver model device structure for this PHY
 237  * phy_id: UID for this device found during discovery
 238  * state: state of the PHY for management purposes
 239  * dev_flags: Device-specific flags used by the PHY driver.
 240  * addr: Bus address of PHY
 241  * link_timeout: The number of timer firings to wait before the
 242  * giving up on the current attempt at acquiring a link
 243  * irq: IRQ number of the PHY's interrupt (-1 if none)
 244  * phy_timer: The timer for handling the state machine
 245  * phy_queue: A work_queue for the interrupt
 246  * attached_dev: The attached enet driver's device instance ptr
 247  * adjust_link: Callback for the enet controller to respond to
 248  * changes in the link state.
 249  * adjust_state: Callback for the enet driver to respond to
 250  * changes in the state machine.
 251  *
 252  * speed, duplex, pause, supported, advertising, and
 253  * autoneg are used like in mii_if_info
 254  *
 255  * interrupts currently only supports enabled or disabled,
 256  * but could be changed in the future to support enabling
 257  * and disabling specific interrupts
 258  *
 259  * Contains some infrastructure for polling and interrupt
 260  * handling, as well as handling shifts in PHY hardware state
 261  */
 262 struct phy_device {
 263         /* Information about the PHY type */
 264         /* And management functions */
 265         struct phy_driver *drv;
 266
 267         struct mii_bus *bus;
 268
 269         struct device dev;
 270
 271         u32 phy_id;
 272
 273         enum phy_state state;
 274
 275         u32 dev_flags;
 276
 277         phy_interface_t interface;
 278
 279         /* Bus address of the PHY (0-32) */
 280         int addr;
 281
 282         /*
 283          * forced speed & duplex (no autoneg)
 284          * partner speed & duplex & pause (autoneg)
 285          */
 286         int speed;
 287         int duplex;
 288         int pause;
 289         int asym_pause;
 290
 291         /* The most recently read link state */
 292         int link;
 293
 294         /* Enabled Interrupts */
 295         u32 interrupts;
 296
 297         /* Union of PHY and Attached devices' supported modes */
 298         /* See mii.h for more info */
 299         u32 supported;
 300         u32 advertising;
 301
 302         int autoneg;
 303
 304         int link_timeout;
 305
 306         /*
 307          * Interrupt number for this PHY
 308          * -1 means no interrupt
 309          */
 310         int irq;
 311
 312         /* private data pointer */
 313         /* For use by PHYs to maintain extra state */
 314         void *priv;
 315
 316         /* Interrupt and Polling infrastructure */
 317         struct work_struct phy_queue;
 318         struct work_struct state_queue;
 319         struct timer_list phy_timer;
 320         atomic_t irq_disable;
 321
 322         struct mutex lock;
 323
 324         struct net_device *attached_dev;
 325
 326         void (*adjust_link)(struct net_device *dev);
 327
 328         void (*adjust_state)(struct net_device *dev);
 329 };
 330 #define to_phy_device(d) container_of(d, struct phy_device, dev)
 331
 332 /* struct phy_driver: Driver structure for a particular PHY type
 333  *
 334  * phy_id: The result of reading the UID registers of this PHY
 335  *   type, and ANDing them with the phy_id_mask.  This driver
 336  *   only works for PHYs with IDs which match this field
 337  * name: The friendly name of this PHY type
 338  * phy_id_mask: Defines the important bits of the phy_id
 339  * features: A list of features (speed, duplex, etc) supported
 340  *   by this PHY
 341  * flags: A bitfield defining certain other features this PHY
 342  *   supports (like interrupts)
 343  *
 344  * The drivers must implement config_aneg and read_status.  All
 345  * other functions are optional. Note that none of these
 346  * functions should be called from interrupt time.  The goal is
 347  * for the bus read/write functions to be able to block when the
 348  * bus transaction is happening, and be freed up by an interrupt
 349  * (The MPC85xx has this ability, though it is not currently
 350  * supported in the driver).
 351  */
 352 struct phy_driver {
 353         u32 phy_id;
 354         char *name;
 355         unsigned int phy_id_mask;
 356         u32 features;
 357         u32 flags;
 358
 359         /*
 360          * Called to initialize the PHY,
 361          * including after a reset
 362          */
 363         int (*config_init)(struct phy_device *phydev);
 364
 365         /*
 366          * Called during discovery.  Used to set
 367          * up device-specific structures, if any
 368          */
 369         int (*probe)(struct phy_device *phydev);
 370
 371         /* PHY Power Management */
 372         int (*suspend)(struct phy_device *phydev);
 373         int (*resume)(struct phy_device *phydev);
 374
 375         /*
 376          * Configures the advertisement and resets
 377          * autonegotiation if phydev->autoneg is on,
 378          * forces the speed to the current settings in phydev
 379          * if phydev->autoneg is off
 380          */
 381         int (*config_aneg)(struct phy_device *phydev);
 382
 383         /* Determines the negotiated speed and duplex */
 384         int (*read_status)(struct phy_device *phydev);
 385
 386         /* Clears any pending interrupts */
 387         int (*ack_interrupt)(struct phy_device *phydev);
 388
 389         /* Enables or disables interrupts */
 390         int (*config_intr)(struct phy_device *phydev);
 391
 392         /* Clears up any memory if needed */
 393         void (*remove)(struct phy_device *phydev);
 394
 395         struct device_driver driver;
 396 };
 397 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
 398
 399 #define PHY_ANY_ID "MATCH ANY PHY"
 400 #define PHY_ANY_UID 0xffffffff
 401
 402 /* A Structure for boards to register fixups with the PHY Lib */
 403 struct phy_fixup {
 404         struct list_head list;
 405         char bus_id[BUS_ID_SIZE];
 406         u32 phy_uid;
 407         u32 phy_uid_mask;
 408         int (*run)(struct phy_device *phydev);
 409 };
 410
 411 /**
 412  * phy_read - Convenience function for reading a given PHY register
 413  * @phydev: the phy_device struct
 414  * @regnum: register number to read
 415  *
 416  * NOTE: MUST NOT be called from interrupt context,
 417  * because the bus read/write functions may wait for an interrupt
 418  * to conclude the operation.
 419  */
 420 static inline int phy_read(struct phy_device *phydev, u16 regnum)
 421 {
 422         return mdiobus_read(phydev->bus, phydev->addr, regnum);
 423 }
 424
 425 /**
 426  * phy_write - Convenience function for writing a given PHY register
 427  * @phydev: the phy_device struct
 428  * @regnum: register number to write
 429  * @val: value to write to @regnum
 430  *
 431  * NOTE: MUST NOT be called from interrupt context,
 432  * because the bus read/write functions may wait for an interrupt
 433  * to conclude the operation.
 434  */
 435 static inline int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
 436 {
 437         return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
 438 }
 439
 440 int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
 441 struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
 442 int phy_clear_interrupt(struct phy_device *phydev);
 443 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
 444 struct phy_device * phy_attach(struct net_device *dev,
 445                 const char *bus_id, u32 flags, phy_interface_t interface);
 446 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 447                 void (*handler)(struct net_device *), u32 flags,
 448                 phy_interface_t interface);
 449 void phy_disconnect(struct phy_device *phydev);
 450 void phy_detach(struct phy_device *phydev);
 451 void phy_start(struct phy_device *phydev);
 452 void phy_stop(struct phy_device *phydev);
 453 int phy_start_aneg(struct phy_device *phydev);
 454
 455 void phy_sanitize_settings(struct phy_device *phydev);
 456 int phy_stop_interrupts(struct phy_device *phydev);
 457 int phy_enable_interrupts(struct phy_device *phydev);
 458 int phy_disable_interrupts(struct phy_device *phydev);
 459
 460 static inline int phy_read_status(struct phy_device *phydev) {
 461         return phydev->drv->read_status(phydev);
 462 }
 463
 464 int genphy_config_advert(struct phy_device *phydev);
 465 int genphy_setup_forced(struct phy_device *phydev);
 466 int genphy_restart_aneg(struct phy_device *phydev);
 467 int genphy_config_aneg(struct phy_device *phydev);
 468 int genphy_update_link(struct phy_device *phydev);
 469 int genphy_read_status(struct phy_device *phydev);
 470 void phy_driver_unregister(struct phy_driver *drv);
 471 int phy_driver_register(struct phy_driver *new_driver);
 472 void phy_prepare_link(struct phy_device *phydev,
 473                 void (*adjust_link)(struct net_device *));
 474 void phy_start_machine(struct phy_device *phydev,
 475                 void (*handler)(struct net_device *));
 476 void phy_stop_machine(struct phy_device *phydev);
 477 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 478 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 479 int phy_mii_ioctl(struct phy_device *phydev,
 480                 struct mii_ioctl_data *mii_data, int cmd);
 481 int phy_start_interrupts(struct phy_device *phydev);
 482 void phy_print_status(struct phy_device *phydev);
 483 struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id);
 484 void phy_device_free(struct phy_device *phydev);
 485
 486 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
 487                 int (*run)(struct phy_device *));
 488 int phy_register_fixup_for_id(const char *bus_id,
 489                 int (*run)(struct phy_device *));
 490 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
 491                 int (*run)(struct phy_device *));
 492 int phy_scan_fixups(struct phy_device *phydev);
 493
 494 int __init mdio_bus_init(void);
 495 void mdio_bus_exit(void);
 496
 497 extern struct bus_type mdio_bus_type;
 498 #endif /* __PHY_H */