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/ethtool.h>
  23 #include <linux/mii.h>
  24 #include <linux/timer.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/mod_devicetable.h>
  27
  28 #include <linux/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_NA,
  56         PHY_INTERFACE_MODE_MII,
  57         PHY_INTERFACE_MODE_GMII,
  58         PHY_INTERFACE_MODE_SGMII,
  59         PHY_INTERFACE_MODE_TBI,
  60         PHY_INTERFACE_MODE_RMII,
  61         PHY_INTERFACE_MODE_RGMII,
  62         PHY_INTERFACE_MODE_RGMII_ID,
  63         PHY_INTERFACE_MODE_RGMII_RXID,
  64         PHY_INTERFACE_MODE_RGMII_TXID,
  65         PHY_INTERFACE_MODE_RTBI,
  66         PHY_INTERFACE_MODE_SMII,
  67 } phy_interface_t;
  68
  69
  70 #define PHY_INIT_TIMEOUT        100000
  71 #define PHY_STATE_TIME          1
  72 #define PHY_FORCE_TIMEOUT       10
  73 #define PHY_AN_TIMEOUT          10
  74
  75 #define PHY_MAX_ADDR    32
  76
  77 /* Used when trying to connect to a specific phy (mii bus id:phy device id) */
  78 #define PHY_ID_FMT "%s:%02x"
  79
  80 /*
  81  * Need to be a little smaller than phydev->dev.bus_id to leave room
  82  * for the ":%02x"
  83  */
  84 #define MII_BUS_ID_SIZE (20 - 3)
  85
  86 /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
  87    IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips. */
  88 #define MII_ADDR_C45 (1<<30)
  89
  90 struct device;
  91 struct sk_buff;
  92
  93 /*
  94  * The Bus class for PHYs.  Devices which provide access to
  95  * PHYs should register using this structure
  96  */
  97 struct mii_bus {
  98         const char *name;
  99         char id[MII_BUS_ID_SIZE];
 100         void *priv;
 101         int (*read)(struct mii_bus *bus, int phy_id, int regnum);
 102         int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
 103         int (*reset)(struct mii_bus *bus);
 104
 105         /*
 106          * A lock to ensure that only one thing can read/write
 107          * the MDIO bus at a time
 108          */
 109         struct mutex mdio_lock;
 110
 111         struct device *parent;
 112         enum {
 113                 MDIOBUS_ALLOCATED = 1,
 114                 MDIOBUS_REGISTERED,
 115                 MDIOBUS_UNREGISTERED,
 116                 MDIOBUS_RELEASED,
 117         } state;
 118         struct device dev;
 119
 120         /* list of all PHYs on bus */
 121         struct phy_device *phy_map[PHY_MAX_ADDR];
 122
 123         /* PHY addresses to be ignored when probing */
 124         u32 phy_mask;
 125
 126         /*
 127          * Pointer to an array of interrupts, each PHY's
 128          * interrupt at the index matching its address
 129          */
 130         int *irq;
 131 };
 132 #define to_mii_bus(d) container_of(d, struct mii_bus, dev)
 133
 134 struct mii_bus *mdiobus_alloc_size(size_t);
 135 static inline struct mii_bus *mdiobus_alloc(void)
 136 {
 137         return mdiobus_alloc_size(0);
 138 }
 139
 140 int mdiobus_register(struct mii_bus *bus);
 141 void mdiobus_unregister(struct mii_bus *bus);
 142 void mdiobus_free(struct mii_bus *bus);
 143 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
 144 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 145 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 146
 147
 148 #define PHY_INTERRUPT_DISABLED  0x0
 149 #define PHY_INTERRUPT_ENABLED   0x80000000
 150
 151 /* PHY state machine states:
 152  *
 153  * DOWN: PHY device and driver are not ready for anything.  probe
 154  * should be called if and only if the PHY is in this state,
 155  * given that the PHY device exists.
 156  * - PHY driver probe function will, depending on the PHY, set
 157  * the state to STARTING or READY
 158  *
 159  * STARTING:  PHY device is coming up, and the ethernet driver is
 160  * not ready.  PHY drivers may set this in the probe function.
 161  * If they do, they are responsible for making sure the state is
 162  * eventually set to indicate whether the PHY is UP or READY,
 163  * depending on the state when the PHY is done starting up.
 164  * - PHY driver will set the state to READY
 165  * - start will set the state to PENDING
 166  *
 167  * READY: PHY is ready to send and receive packets, but the
 168  * controller is not.  By default, PHYs which do not implement
 169  * probe will be set to this state by phy_probe().  If the PHY
 170  * driver knows the PHY is ready, and the PHY state is STARTING,
 171  * then it sets this STATE.
 172  * - start will set the state to UP
 173  *
 174  * PENDING: PHY device is coming up, but the ethernet driver is
 175  * ready.  phy_start will set this state if the PHY state is
 176  * STARTING.
 177  * - PHY driver will set the state to UP when the PHY is ready
 178  *
 179  * UP: The PHY and attached device are ready to do work.
 180  * Interrupts should be started here.
 181  * - timer moves to AN
 182  *
 183  * AN: The PHY is currently negotiating the link state.  Link is
 184  * therefore down for now.  phy_timer will set this state when it
 185  * detects the state is UP.  config_aneg will set this state
 186  * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
 187  * - If autonegotiation finishes, but there's no link, it sets
 188  *   the state to NOLINK.
 189  * - If aneg finishes with link, it sets the state to RUNNING,
 190  *   and calls adjust_link
 191  * - If autonegotiation did not finish after an arbitrary amount
 192  *   of time, autonegotiation should be tried again if the PHY
 193  *   supports "magic" autonegotiation (back to AN)
 194  * - If it didn't finish, and no magic_aneg, move to FORCING.
 195  *
 196  * NOLINK: PHY is up, but not currently plugged in.
 197  * - If the timer notes that the link comes back, we move to RUNNING
 198  * - config_aneg moves to AN
 199  * - phy_stop moves to HALTED
 200  *
 201  * FORCING: PHY is being configured with forced settings
 202  * - if link is up, move to RUNNING
 203  * - If link is down, we drop to the next highest setting, and
 204  *   retry (FORCING) after a timeout
 205  * - phy_stop moves to HALTED
 206  *
 207  * RUNNING: PHY is currently up, running, and possibly sending
 208  * and/or receiving packets
 209  * - timer will set CHANGELINK if we're polling (this ensures the
 210  *   link state is polled every other cycle of this state machine,
 211  *   which makes it every other second)
 212  * - irq will set CHANGELINK
 213  * - config_aneg will set AN
 214  * - phy_stop moves to HALTED
 215  *
 216  * CHANGELINK: PHY experienced a change in link state
 217  * - timer moves to RUNNING if link
 218  * - timer moves to NOLINK if the link is down
 219  * - phy_stop moves to HALTED
 220  *
 221  * HALTED: PHY is up, but no polling or interrupts are done. Or
 222  * PHY is in an error state.
 223  *
 224  * - phy_start moves to RESUMING
 225  *
 226  * RESUMING: PHY was halted, but now wants to run again.
 227  * - If we are forcing, or aneg is done, timer moves to RUNNING
 228  * - If aneg is not done, timer moves to AN
 229  * - phy_stop moves to HALTED
 230  */
 231 enum phy_state {
 232         PHY_DOWN=0,
 233         PHY_STARTING,
 234         PHY_READY,
 235         PHY_PENDING,
 236         PHY_UP,
 237         PHY_AN,
 238         PHY_RUNNING,
 239         PHY_NOLINK,
 240         PHY_FORCING,
 241         PHY_CHANGELINK,
 242         PHY_HALTED,
 243         PHY_RESUMING
 244 };
 245
 246 /**
 247  * struct phy_c45_device_ids - 802.3-c45 Device Identifiers
 248  * @devices_in_package: Bit vector of devices present.
 249  * @device_ids: The device identifer for each present device.
 250  */
 251 struct phy_c45_device_ids {
 252         u32 devices_in_package;
 253         u32 device_ids[8];
 254 };
 255
 256 /* phy_device: An instance of a PHY
 257  *
 258  * drv: Pointer to the driver for this PHY instance
 259  * bus: Pointer to the bus this PHY is on
 260  * dev: driver model device structure for this PHY
 261  * phy_id: UID for this device found during discovery
 262  * c45_ids: 802.3-c45 Device Identifers if is_c45.
 263  * is_c45:  Set to true if this phy uses clause 45 addressing.
 264  * state: state of the PHY for management purposes
 265  * dev_flags: Device-specific flags used by the PHY driver.
 266  * addr: Bus address of PHY
 267  * link_timeout: The number of timer firings to wait before the
 268  * giving up on the current attempt at acquiring a link
 269  * irq: IRQ number of the PHY's interrupt (-1 if none)
 270  * phy_timer: The timer for handling the state machine
 271  * phy_queue: A work_queue for the interrupt
 272  * attached_dev: The attached enet driver's device instance ptr
 273  * adjust_link: Callback for the enet controller to respond to
 274  * changes in the link state.
 275  * adjust_state: Callback for the enet driver to respond to
 276  * changes in the state machine.
 277  *
 278  * speed, duplex, pause, supported, advertising, and
 279  * autoneg are used like in mii_if_info
 280  *
 281  * interrupts currently only supports enabled or disabled,
 282  * but could be changed in the future to support enabling
 283  * and disabling specific interrupts
 284  *
 285  * Contains some infrastructure for polling and interrupt
 286  * handling, as well as handling shifts in PHY hardware state
 287  */
 288 struct phy_device {
 289         /* Information about the PHY type */
 290         /* And management functions */
 291         struct phy_driver *drv;
 292
 293         struct mii_bus *bus;
 294
 295         struct device dev;
 296
 297         u32 phy_id;
 298
 299         struct phy_c45_device_ids c45_ids;
 300         bool is_c45;
 301
 302         enum phy_state state;
 303
 304         u32 dev_flags;
 305
 306         phy_interface_t interface;
 307
 308         /* Bus address of the PHY (0-31) */
 309         int addr;
 310
 311         /*
 312          * forced speed & duplex (no autoneg)
 313          * partner speed & duplex & pause (autoneg)
 314          */
 315         int speed;
 316         int duplex;
 317         int pause;
 318         int asym_pause;
 319
 320         /* The most recently read link state */
 321         int link;
 322
 323         /* Enabled Interrupts */
 324         u32 interrupts;
 325
 326         /* Union of PHY and Attached devices' supported modes */
 327         /* See mii.h for more info */
 328         u32 supported;
 329         u32 advertising;
 330
 331         int autoneg;
 332
 333         int link_timeout;
 334
 335         /*
 336          * Interrupt number for this PHY
 337          * -1 means no interrupt
 338          */
 339         int irq;
 340
 341         /* private data pointer */
 342         /* For use by PHYs to maintain extra state */
 343         void *priv;
 344
 345         /* Interrupt and Polling infrastructure */
 346         struct work_struct phy_queue;
 347         struct delayed_work state_queue;
 348         atomic_t irq_disable;
 349
 350         struct mutex lock;
 351
 352         struct net_device *attached_dev;
 353
 354         void (*adjust_link)(struct net_device *dev);
 355
 356         void (*adjust_state)(struct net_device *dev);
 357 };
 358 #define to_phy_device(d) container_of(d, struct phy_device, dev)
 359
 360 /* struct phy_driver: Driver structure for a particular PHY type
 361  *
 362  * phy_id: The result of reading the UID registers of this PHY
 363  *   type, and ANDing them with the phy_id_mask.  This driver
 364  *   only works for PHYs with IDs which match this field
 365  * name: The friendly name of this PHY type
 366  * phy_id_mask: Defines the important bits of the phy_id
 367  * features: A list of features (speed, duplex, etc) supported
 368  *   by this PHY
 369  * flags: A bitfield defining certain other features this PHY
 370  *   supports (like interrupts)
 371  *
 372  * The drivers must implement config_aneg and read_status.  All
 373  * other functions are optional. Note that none of these
 374  * functions should be called from interrupt time.  The goal is
 375  * for the bus read/write functions to be able to block when the
 376  * bus transaction is happening, and be freed up by an interrupt
 377  * (The MPC85xx has this ability, though it is not currently
 378  * supported in the driver).
 379  */
 380 struct phy_driver {
 381         u32 phy_id;
 382         char *name;
 383         unsigned int phy_id_mask;
 384         u32 features;
 385         u32 flags;
 386
 387         /*
 388          * Called to initialize the PHY,
 389          * including after a reset
 390          */
 391         int (*config_init)(struct phy_device *phydev);
 392
 393         /*
 394          * Called during discovery.  Used to set
 395          * up device-specific structures, if any
 396          */
 397         int (*probe)(struct phy_device *phydev);
 398
 399         /* PHY Power Management */
 400         int (*suspend)(struct phy_device *phydev);
 401         int (*resume)(struct phy_device *phydev);
 402
 403         /*
 404          * Configures the advertisement and resets
 405          * autonegotiation if phydev->autoneg is on,
 406          * forces the speed to the current settings in phydev
 407          * if phydev->autoneg is off
 408          */
 409         int (*config_aneg)(struct phy_device *phydev);
 410
 411         /* Determines the negotiated speed and duplex */
 412         int (*read_status)(struct phy_device *phydev);
 413
 414         /* Clears any pending interrupts */
 415         int (*ack_interrupt)(struct phy_device *phydev);
 416
 417         /* Enables or disables interrupts */
 418         int (*config_intr)(struct phy_device *phydev);
 419
 420         /*
 421          * Checks if the PHY generated an interrupt.
 422          * For multi-PHY devices with shared PHY interrupt pin
 423          */
 424         int (*did_interrupt)(struct phy_device *phydev);
 425
 426         /* Clears up any memory if needed */
 427         void (*remove)(struct phy_device *phydev);
 428
 429         /* Returns true if this is a suitable driver for the given
 430          * phydev.  If NULL, matching is based on phy_id and
 431          * phy_id_mask.
 432          */
 433         int (*match_phy_device)(struct phy_device *phydev);
 434
 435         /* Handles ethtool queries for hardware time stamping. */
 436         int (*ts_info)(struct phy_device *phydev, struct ethtool_ts_info *ti);
 437
 438         /* Handles SIOCSHWTSTAMP ioctl for hardware time stamping. */
 439         int  (*hwtstamp)(struct phy_device *phydev, struct ifreq *ifr);
 440
 441         /*
 442          * Requests a Rx timestamp for 'skb'. If the skb is accepted,
 443          * the phy driver promises to deliver it using netif_rx() as
 444          * soon as a timestamp becomes available. One of the
 445          * PTP_CLASS_ values is passed in 'type'. The function must
 446          * return true if the skb is accepted for delivery.
 447          */
 448         bool (*rxtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
 449
 450         /*
 451          * Requests a Tx timestamp for 'skb'. The phy driver promises
 452          * to deliver it using skb_complete_tx_timestamp() as soon as a
 453          * timestamp becomes available. One of the PTP_CLASS_ values
 454          * is passed in 'type'.
 455          */
 456         void (*txtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
 457
 458         struct device_driver driver;
 459 };
 460 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
 461
 462 #define PHY_ANY_ID "MATCH ANY PHY"
 463 #define PHY_ANY_UID 0xffffffff
 464
 465 /* A Structure for boards to register fixups with the PHY Lib */
 466 struct phy_fixup {
 467         struct list_head list;
 468         char bus_id[20];
 469         u32 phy_uid;
 470         u32 phy_uid_mask;
 471         int (*run)(struct phy_device *phydev);
 472 };
 473
 474 /**
 475  * phy_read - Convenience function for reading a given PHY register
 476  * @phydev: the phy_device struct
 477  * @regnum: register number to read
 478  *
 479  * NOTE: MUST NOT be called from interrupt context,
 480  * because the bus read/write functions may wait for an interrupt
 481  * to conclude the operation.
 482  */
 483 static inline int phy_read(struct phy_device *phydev, u32 regnum)
 484 {
 485         return mdiobus_read(phydev->bus, phydev->addr, regnum);
 486 }
 487
 488 /**
 489  * phy_write - Convenience function for writing a given PHY register
 490  * @phydev: the phy_device struct
 491  * @regnum: register number to write
 492  * @val: value to write to @regnum
 493  *
 494  * NOTE: MUST NOT be called from interrupt context,
 495  * because the bus read/write functions may wait for an interrupt
 496  * to conclude the operation.
 497  */
 498 static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)
 499 {
 500         return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
 501 }
 502
 503 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 504                 bool is_c45, struct phy_c45_device_ids *c45_ids);
 505 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 506 int phy_device_register(struct phy_device *phy);
 507 int phy_init_hw(struct phy_device *phydev);
 508 struct phy_device * phy_attach(struct net_device *dev,
 509                 const char *bus_id, u32 flags, phy_interface_t interface);
 510 struct phy_device *phy_find_first(struct mii_bus *bus);
 511 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 512                 void (*handler)(struct net_device *), u32 flags,
 513                 phy_interface_t interface);
 514 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 515                 void (*handler)(struct net_device *), u32 flags,
 516                 phy_interface_t interface);
 517 void phy_disconnect(struct phy_device *phydev);
 518 void phy_detach(struct phy_device *phydev);
 519 void phy_start(struct phy_device *phydev);
 520 void phy_stop(struct phy_device *phydev);
 521 int phy_start_aneg(struct phy_device *phydev);
 522
 523 int phy_stop_interrupts(struct phy_device *phydev);
 524
 525 static inline int phy_read_status(struct phy_device *phydev) {
 526         return phydev->drv->read_status(phydev);
 527 }
 528
 529 int genphy_restart_aneg(struct phy_device *phydev);
 530 int genphy_config_aneg(struct phy_device *phydev);
 531 int genphy_update_link(struct phy_device *phydev);
 532 int genphy_read_status(struct phy_device *phydev);
 533 int genphy_suspend(struct phy_device *phydev);
 534 int genphy_resume(struct phy_device *phydev);
 535 void phy_driver_unregister(struct phy_driver *drv);
 536 void phy_drivers_unregister(struct phy_driver *drv, int n);
 537 int phy_driver_register(struct phy_driver *new_driver);
 538 int phy_drivers_register(struct phy_driver *new_driver, int n);
 539 void phy_state_machine(struct work_struct *work);
 540 void phy_start_machine(struct phy_device *phydev,
 541                 void (*handler)(struct net_device *));
 542 void phy_stop_machine(struct phy_device *phydev);
 543 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 544 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 545 int phy_mii_ioctl(struct phy_device *phydev,
 546                 struct ifreq *ifr, int cmd);
 547 int phy_start_interrupts(struct phy_device *phydev);
 548 void phy_print_status(struct phy_device *phydev);
 549 void phy_device_free(struct phy_device *phydev);
 550
 551 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
 552                 int (*run)(struct phy_device *));
 553 int phy_register_fixup_for_id(const char *bus_id,
 554                 int (*run)(struct phy_device *));
 555 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
 556                 int (*run)(struct phy_device *));
 557 int phy_scan_fixups(struct phy_device *phydev);
 558
 559 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable);
 560 int phy_get_eee_err(struct phy_device *phydev);
 561 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data);
 562 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data);
 563
 564 int __init mdio_bus_init(void);
 565 void mdio_bus_exit(void);
 566
 567 extern struct bus_type mdio_bus_type;
 568 #endif /* __PHY_H */