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 #include <linux/mod_devicetable.h>
  28
  29 #include <linux/atomic.h>
  30
  31 #define PHY_BASIC_FEATURES      (SUPPORTED_10baseT_Half | \
  32                                  SUPPORTED_10baseT_Full | \
  33                                  SUPPORTED_100baseT_Half | \
  34                                  SUPPORTED_100baseT_Full | \
  35                                  SUPPORTED_Autoneg | \
  36                                  SUPPORTED_TP | \
  37                                  SUPPORTED_MII)
  38
  39 #define PHY_GBIT_FEATURES       (PHY_BASIC_FEATURES | \
  40                                  SUPPORTED_1000baseT_Half | \
  41                                  SUPPORTED_1000baseT_Full)
  42
  43 /*
  44  * Set phydev->irq to PHY_POLL if interrupts are not supported,
  45  * or not desired for this PHY.  Set to PHY_IGNORE_INTERRUPT if
  46  * the attached driver handles the interrupt
  47  */
  48 #define PHY_POLL                -1
  49 #define PHY_IGNORE_INTERRUPT    -2
  50
  51 #define PHY_HAS_INTERRUPT       0x00000001
  52 #define PHY_HAS_MAGICANEG       0x00000002
  53
  54 /* Interface Mode definitions */
  55 typedef enum {
  56         PHY_INTERFACE_MODE_NA,
  57         PHY_INTERFACE_MODE_MII,
  58         PHY_INTERFACE_MODE_GMII,
  59         PHY_INTERFACE_MODE_SGMII,
  60         PHY_INTERFACE_MODE_TBI,
  61         PHY_INTERFACE_MODE_RMII,
  62         PHY_INTERFACE_MODE_RGMII,
  63         PHY_INTERFACE_MODE_RGMII_ID,
  64         PHY_INTERFACE_MODE_RGMII_RXID,
  65         PHY_INTERFACE_MODE_RGMII_TXID,
  66         PHY_INTERFACE_MODE_RTBI,
  67         PHY_INTERFACE_MODE_SMII,
  68 } phy_interface_t;
  69
  70
  71 #define PHY_INIT_TIMEOUT        100000
  72 #define PHY_STATE_TIME          1
  73 #define PHY_FORCE_TIMEOUT       10
  74 #define PHY_AN_TIMEOUT          10
  75
  76 #define PHY_MAX_ADDR    32
  77
  78 /* Used when trying to connect to a specific phy (mii bus id:phy device id) */
  79 #define PHY_ID_FMT "%s:%02x"
  80
  81 /*
  82  * Need to be a little smaller than phydev->dev.bus_id to leave room
  83  * for the ":%02x"
  84  */
  85 #define MII_BUS_ID_SIZE (20 - 3)
  86
  87 /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
  88    IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips. */
  89 #define MII_ADDR_C45 (1<<30)
  90
  91 /*
  92  * The Bus class for PHYs.  Devices which provide access to
  93  * PHYs should register using this structure
  94  */
  95 struct mii_bus {
  96         const char *name;
  97         char id[MII_BUS_ID_SIZE];
  98         void *priv;
  99         int (*read)(struct mii_bus *bus, int phy_id, int regnum);
 100         int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
 101         int (*reset)(struct mii_bus *bus);
 102
 103         /*
 104          * A lock to ensure that only one thing can read/write
 105          * the MDIO bus at a time
 106          */
 107         struct mutex mdio_lock;
 108
 109         struct device *parent;
 110         enum {
 111                 MDIOBUS_ALLOCATED = 1,
 112                 MDIOBUS_REGISTERED,
 113                 MDIOBUS_UNREGISTERED,
 114                 MDIOBUS_RELEASED,
 115         } state;
 116         struct device dev;
 117
 118         /* list of all PHYs on bus */
 119         struct phy_device *phy_map[PHY_MAX_ADDR];
 120
 121         /* PHY addresses to be ignored when probing */
 122         u32 phy_mask;
 123
 124         /*
 125          * Pointer to an array of interrupts, each PHY's
 126          * interrupt at the index matching its address
 127          */
 128         int *irq;
 129 };
 130 #define to_mii_bus(d) container_of(d, struct mii_bus, dev)
 131
 132 struct mii_bus *mdiobus_alloc(void);
 133 int mdiobus_register(struct mii_bus *bus);
 134 void mdiobus_unregister(struct mii_bus *bus);
 135 void mdiobus_free(struct mii_bus *bus);
 136 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
 137 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 138 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 139
 140
 141 #define PHY_INTERRUPT_DISABLED  0x0
 142 #define PHY_INTERRUPT_ENABLED   0x80000000
 143
 144 /* PHY state machine states:
 145  *
 146  * DOWN: PHY device and driver are not ready for anything.  probe
 147  * should be called if and only if the PHY is in this state,
 148  * given that the PHY device exists.
 149  * - PHY driver probe function will, depending on the PHY, set
 150  * the state to STARTING or READY
 151  *
 152  * STARTING:  PHY device is coming up, and the ethernet driver is
 153  * not ready.  PHY drivers may set this in the probe function.
 154  * If they do, they are responsible for making sure the state is
 155  * eventually set to indicate whether the PHY is UP or READY,
 156  * depending on the state when the PHY is done starting up.
 157  * - PHY driver will set the state to READY
 158  * - start will set the state to PENDING
 159  *
 160  * READY: PHY is ready to send and receive packets, but the
 161  * controller is not.  By default, PHYs which do not implement
 162  * probe will be set to this state by phy_probe().  If the PHY
 163  * driver knows the PHY is ready, and the PHY state is STARTING,
 164  * then it sets this STATE.
 165  * - start will set the state to UP
 166  *
 167  * PENDING: PHY device is coming up, but the ethernet driver is
 168  * ready.  phy_start will set this state if the PHY state is
 169  * STARTING.
 170  * - PHY driver will set the state to UP when the PHY is ready
 171  *
 172  * UP: The PHY and attached device are ready to do work.
 173  * Interrupts should be started here.
 174  * - timer moves to AN
 175  *
 176  * AN: The PHY is currently negotiating the link state.  Link is
 177  * therefore down for now.  phy_timer will set this state when it
 178  * detects the state is UP.  config_aneg will set this state
 179  * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
 180  * - If autonegotiation finishes, but there's no link, it sets
 181  *   the state to NOLINK.
 182  * - If aneg finishes with link, it sets the state to RUNNING,
 183  *   and calls adjust_link
 184  * - If autonegotiation did not finish after an arbitrary amount
 185  *   of time, autonegotiation should be tried again if the PHY
 186  *   supports "magic" autonegotiation (back to AN)
 187  * - If it didn't finish, and no magic_aneg, move to FORCING.
 188  *
 189  * NOLINK: PHY is up, but not currently plugged in.
 190  * - If the timer notes that the link comes back, we move to RUNNING
 191  * - config_aneg moves to AN
 192  * - phy_stop moves to HALTED
 193  *
 194  * FORCING: PHY is being configured with forced settings
 195  * - if link is up, move to RUNNING
 196  * - If link is down, we drop to the next highest setting, and
 197  *   retry (FORCING) after a timeout
 198  * - phy_stop moves to HALTED
 199  *
 200  * RUNNING: PHY is currently up, running, and possibly sending
 201  * and/or receiving packets
 202  * - timer will set CHANGELINK if we're polling (this ensures the
 203  *   link state is polled every other cycle of this state machine,
 204  *   which makes it every other second)
 205  * - irq will set CHANGELINK
 206  * - config_aneg will set AN
 207  * - phy_stop moves to HALTED
 208  *
 209  * CHANGELINK: PHY experienced a change in link state
 210  * - timer moves to RUNNING if link
 211  * - timer moves to NOLINK if the link is down
 212  * - phy_stop moves to HALTED
 213  *
 214  * HALTED: PHY is up, but no polling or interrupts are done. Or
 215  * PHY is in an error state.
 216  *
 217  * - phy_start moves to RESUMING
 218  *
 219  * RESUMING: PHY was halted, but now wants to run again.
 220  * - If we are forcing, or aneg is done, timer moves to RUNNING
 221  * - If aneg is not done, timer moves to AN
 222  * - phy_stop moves to HALTED
 223  */
 224 enum phy_state {
 225         PHY_DOWN=0,
 226         PHY_STARTING,
 227         PHY_READY,
 228         PHY_PENDING,
 229         PHY_UP,
 230         PHY_AN,
 231         PHY_RUNNING,
 232         PHY_NOLINK,
 233         PHY_FORCING,
 234         PHY_CHANGELINK,
 235         PHY_HALTED,
 236         PHY_RESUMING
 237 };
 238
 239 struct sk_buff;
 240
 241 /* phy_device: An instance of a PHY
 242  *
 243  * drv: Pointer to the driver for this PHY instance
 244  * bus: Pointer to the bus this PHY is on
 245  * dev: driver model device structure for this PHY
 246  * phy_id: UID for this device found during discovery
 247  * state: state of the PHY for management purposes
 248  * dev_flags: Device-specific flags used by the PHY driver.
 249  * addr: Bus address of PHY
 250  * link_timeout: The number of timer firings to wait before the
 251  * giving up on the current attempt at acquiring a link
 252  * irq: IRQ number of the PHY's interrupt (-1 if none)
 253  * phy_timer: The timer for handling the state machine
 254  * phy_queue: A work_queue for the interrupt
 255  * attached_dev: The attached enet driver's device instance ptr
 256  * adjust_link: Callback for the enet controller to respond to
 257  * changes in the link state.
 258  * adjust_state: Callback for the enet driver to respond to
 259  * changes in the state machine.
 260  *
 261  * speed, duplex, pause, supported, advertising, and
 262  * autoneg are used like in mii_if_info
 263  *
 264  * interrupts currently only supports enabled or disabled,
 265  * but could be changed in the future to support enabling
 266  * and disabling specific interrupts
 267  *
 268  * Contains some infrastructure for polling and interrupt
 269  * handling, as well as handling shifts in PHY hardware state
 270  */
 271 struct phy_device {
 272         /* Information about the PHY type */
 273         /* And management functions */
 274         struct phy_driver *drv;
 275
 276         struct mii_bus *bus;
 277
 278         struct device dev;
 279
 280         u32 phy_id;
 281
 282         enum phy_state state;
 283
 284         u32 dev_flags;
 285
 286         phy_interface_t interface;
 287
 288         /* Bus address of the PHY (0-31) */
 289         int addr;
 290
 291         /*
 292          * forced speed & duplex (no autoneg)
 293          * partner speed & duplex & pause (autoneg)
 294          */
 295         int speed;
 296         int duplex;
 297         int pause;
 298         int asym_pause;
 299
 300         /* The most recently read link state */
 301         int link;
 302
 303         /* Enabled Interrupts */
 304         u32 interrupts;
 305
 306         /* Union of PHY and Attached devices' supported modes */
 307         /* See mii.h for more info */
 308         u32 supported;
 309         u32 advertising;
 310
 311         int autoneg;
 312
 313         int link_timeout;
 314
 315         /*
 316          * Interrupt number for this PHY
 317          * -1 means no interrupt
 318          */
 319         int irq;
 320
 321         /* private data pointer */
 322         /* For use by PHYs to maintain extra state */
 323         void *priv;
 324
 325         /* Interrupt and Polling infrastructure */
 326         struct work_struct phy_queue;
 327         struct delayed_work state_queue;
 328         atomic_t irq_disable;
 329
 330         struct mutex lock;
 331
 332         struct net_device *attached_dev;
 333
 334         void (*adjust_link)(struct net_device *dev);
 335
 336         void (*adjust_state)(struct net_device *dev);
 337 };
 338 #define to_phy_device(d) container_of(d, struct phy_device, dev)
 339
 340 /* struct phy_driver: Driver structure for a particular PHY type
 341  *
 342  * phy_id: The result of reading the UID registers of this PHY
 343  *   type, and ANDing them with the phy_id_mask.  This driver
 344  *   only works for PHYs with IDs which match this field
 345  * name: The friendly name of this PHY type
 346  * phy_id_mask: Defines the important bits of the phy_id
 347  * features: A list of features (speed, duplex, etc) supported
 348  *   by this PHY
 349  * flags: A bitfield defining certain other features this PHY
 350  *   supports (like interrupts)
 351  *
 352  * The drivers must implement config_aneg and read_status.  All
 353  * other functions are optional. Note that none of these
 354  * functions should be called from interrupt time.  The goal is
 355  * for the bus read/write functions to be able to block when the
 356  * bus transaction is happening, and be freed up by an interrupt
 357  * (The MPC85xx has this ability, though it is not currently
 358  * supported in the driver).
 359  */
 360 struct phy_driver {
 361         u32 phy_id;
 362         char *name;
 363         unsigned int phy_id_mask;
 364         u32 features;
 365         u32 flags;
 366
 367         /*
 368          * Called to initialize the PHY,
 369          * including after a reset
 370          */
 371         int (*config_init)(struct phy_device *phydev);
 372
 373         /*
 374          * Called during discovery.  Used to set
 375          * up device-specific structures, if any
 376          */
 377         int (*probe)(struct phy_device *phydev);
 378
 379         /* PHY Power Management */
 380         int (*suspend)(struct phy_device *phydev);
 381         int (*resume)(struct phy_device *phydev);
 382
 383         /*
 384          * Configures the advertisement and resets
 385          * autonegotiation if phydev->autoneg is on,
 386          * forces the speed to the current settings in phydev
 387          * if phydev->autoneg is off
 388          */
 389         int (*config_aneg)(struct phy_device *phydev);
 390
 391         /* Determines the negotiated speed and duplex */
 392         int (*read_status)(struct phy_device *phydev);
 393
 394         /* Clears any pending interrupts */
 395         int (*ack_interrupt)(struct phy_device *phydev);
 396
 397         /* Enables or disables interrupts */
 398         int (*config_intr)(struct phy_device *phydev);
 399
 400         /*
 401          * Checks if the PHY generated an interrupt.
 402          * For multi-PHY devices with shared PHY interrupt pin
 403          */
 404         int (*did_interrupt)(struct phy_device *phydev);
 405
 406         /* Clears up any memory if needed */
 407         void (*remove)(struct phy_device *phydev);
 408
 409         /* Handles SIOCSHWTSTAMP ioctl for hardware time stamping. */
 410         int  (*hwtstamp)(struct phy_device *phydev, struct ifreq *ifr);
 411
 412         /*
 413          * Requests a Rx timestamp for 'skb'. If the skb is accepted,
 414          * the phy driver promises to deliver it using netif_rx() as
 415          * soon as a timestamp becomes available. One of the
 416          * PTP_CLASS_ values is passed in 'type'. The function must
 417          * return true if the skb is accepted for delivery.
 418          */
 419         bool (*rxtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
 420
 421         /*
 422          * Requests a Tx timestamp for 'skb'. The phy driver promises
 423          * to deliver it using skb_complete_tx_timestamp() as soon as a
 424          * timestamp becomes available. One of the PTP_CLASS_ values
 425          * is passed in 'type'.
 426          */
 427         void (*txtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
 428
 429         struct device_driver driver;
 430 };
 431 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
 432
 433 #define PHY_ANY_ID "MATCH ANY PHY"
 434 #define PHY_ANY_UID 0xffffffff
 435
 436 /* A Structure for boards to register fixups with the PHY Lib */
 437 struct phy_fixup {
 438         struct list_head list;
 439         char bus_id[20];
 440         u32 phy_uid;
 441         u32 phy_uid_mask;
 442         int (*run)(struct phy_device *phydev);
 443 };
 444
 445 /**
 446  * phy_read - Convenience function for reading a given PHY register
 447  * @phydev: the phy_device struct
 448  * @regnum: register number to read
 449  *
 450  * NOTE: MUST NOT be called from interrupt context,
 451  * because the bus read/write functions may wait for an interrupt
 452  * to conclude the operation.
 453  */
 454 static inline int phy_read(struct phy_device *phydev, u32 regnum)
 455 {
 456         return mdiobus_read(phydev->bus, phydev->addr, regnum);
 457 }
 458
 459 /**
 460  * phy_write - Convenience function for writing a given PHY register
 461  * @phydev: the phy_device struct
 462  * @regnum: register number to write
 463  * @val: value to write to @regnum
 464  *
 465  * NOTE: MUST NOT be called from interrupt context,
 466  * because the bus read/write functions may wait for an interrupt
 467  * to conclude the operation.
 468  */
 469 static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)
 470 {
 471         return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
 472 }
 473
 474 int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
 475 struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
 476 int phy_device_register(struct phy_device *phy);
 477 int phy_init_hw(struct phy_device *phydev);
 478 struct phy_device * phy_attach(struct net_device *dev,
 479                 const char *bus_id, u32 flags, phy_interface_t interface);
 480 struct phy_device *phy_find_first(struct mii_bus *bus);
 481 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 482                 void (*handler)(struct net_device *), u32 flags,
 483                 phy_interface_t interface);
 484 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 485                 void (*handler)(struct net_device *), u32 flags,
 486                 phy_interface_t interface);
 487 void phy_disconnect(struct phy_device *phydev);
 488 void phy_detach(struct phy_device *phydev);
 489 void phy_start(struct phy_device *phydev);
 490 void phy_stop(struct phy_device *phydev);
 491 int phy_start_aneg(struct phy_device *phydev);
 492
 493 int phy_stop_interrupts(struct phy_device *phydev);
 494
 495 static inline int phy_read_status(struct phy_device *phydev) {
 496         return phydev->drv->read_status(phydev);
 497 }
 498
 499 int genphy_restart_aneg(struct phy_device *phydev);
 500 int genphy_config_aneg(struct phy_device *phydev);
 501 int genphy_update_link(struct phy_device *phydev);
 502 int genphy_read_status(struct phy_device *phydev);
 503 int genphy_suspend(struct phy_device *phydev);
 504 int genphy_resume(struct phy_device *phydev);
 505 void phy_driver_unregister(struct phy_driver *drv);
 506 int phy_driver_register(struct phy_driver *new_driver);
 507 void phy_state_machine(struct work_struct *work);
 508 void phy_start_machine(struct phy_device *phydev,
 509                 void (*handler)(struct net_device *));
 510 void phy_stop_machine(struct phy_device *phydev);
 511 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 512 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 513 int phy_mii_ioctl(struct phy_device *phydev,
 514                 struct ifreq *ifr, int cmd);
 515 int phy_start_interrupts(struct phy_device *phydev);
 516 void phy_print_status(struct phy_device *phydev);
 517 void phy_device_free(struct phy_device *phydev);
 518
 519 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
 520                 int (*run)(struct phy_device *));
 521 int phy_register_fixup_for_id(const char *bus_id,
 522                 int (*run)(struct phy_device *));
 523 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
 524                 int (*run)(struct phy_device *));
 525 int phy_scan_fixups(struct phy_device *phydev);
 526
 527 int __init mdio_bus_init(void);
 528 void mdio_bus_exit(void);
 529
 530 extern struct bus_type mdio_bus_type;
 531 #endif /* __PHY_H */