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 /* phy_device: An instance of a PHY
 248  *
 249  * drv: Pointer to the driver for this PHY instance
 250  * bus: Pointer to the bus this PHY is on
 251  * dev: driver model device structure for this PHY
 252  * phy_id: UID for this device found during discovery
 253  * state: state of the PHY for management purposes
 254  * dev_flags: Device-specific flags used by the PHY driver.
 255  * addr: Bus address of PHY
 256  * link_timeout: The number of timer firings to wait before the
 257  * giving up on the current attempt at acquiring a link
 258  * irq: IRQ number of the PHY's interrupt (-1 if none)
 259  * phy_timer: The timer for handling the state machine
 260  * phy_queue: A work_queue for the interrupt
 261  * attached_dev: The attached enet driver's device instance ptr
 262  * adjust_link: Callback for the enet controller to respond to
 263  * changes in the link state.
 264  * adjust_state: Callback for the enet driver to respond to
 265  * changes in the state machine.
 266  *
 267  * speed, duplex, pause, supported, advertising, and
 268  * autoneg are used like in mii_if_info
 269  *
 270  * interrupts currently only supports enabled or disabled,
 271  * but could be changed in the future to support enabling
 272  * and disabling specific interrupts
 273  *
 274  * Contains some infrastructure for polling and interrupt
 275  * handling, as well as handling shifts in PHY hardware state
 276  */
 277 struct phy_device {
 278         /* Information about the PHY type */
 279         /* And management functions */
 280         struct phy_driver *drv;
 281
 282         struct mii_bus *bus;
 283
 284         struct device dev;
 285
 286         u32 phy_id;
 287
 288         enum phy_state state;
 289
 290         u32 dev_flags;
 291
 292         phy_interface_t interface;
 293
 294         /* Bus address of the PHY (0-31) */
 295         int addr;
 296
 297         /*
 298          * forced speed & duplex (no autoneg)
 299          * partner speed & duplex & pause (autoneg)
 300          */
 301         int speed;
 302         int duplex;
 303         int pause;
 304         int asym_pause;
 305
 306         /* The most recently read link state */
 307         int link;
 308
 309         /* Enabled Interrupts */
 310         u32 interrupts;
 311
 312         /* Union of PHY and Attached devices' supported modes */
 313         /* See mii.h for more info */
 314         u32 supported;
 315         u32 advertising;
 316
 317         int autoneg;
 318
 319         int link_timeout;
 320
 321         /*
 322          * Interrupt number for this PHY
 323          * -1 means no interrupt
 324          */
 325         int irq;
 326
 327         /* private data pointer */
 328         /* For use by PHYs to maintain extra state */
 329         void *priv;
 330
 331         /* Interrupt and Polling infrastructure */
 332         struct work_struct phy_queue;
 333         struct delayed_work state_queue;
 334         atomic_t irq_disable;
 335
 336         struct mutex lock;
 337
 338         struct net_device *attached_dev;
 339
 340         void (*adjust_link)(struct net_device *dev);
 341
 342         void (*adjust_state)(struct net_device *dev);
 343 };
 344 #define to_phy_device(d) container_of(d, struct phy_device, dev)
 345
 346 /* struct phy_driver: Driver structure for a particular PHY type
 347  *
 348  * phy_id: The result of reading the UID registers of this PHY
 349  *   type, and ANDing them with the phy_id_mask.  This driver
 350  *   only works for PHYs with IDs which match this field
 351  * name: The friendly name of this PHY type
 352  * phy_id_mask: Defines the important bits of the phy_id
 353  * features: A list of features (speed, duplex, etc) supported
 354  *   by this PHY
 355  * flags: A bitfield defining certain other features this PHY
 356  *   supports (like interrupts)
 357  *
 358  * The drivers must implement config_aneg and read_status.  All
 359  * other functions are optional. Note that none of these
 360  * functions should be called from interrupt time.  The goal is
 361  * for the bus read/write functions to be able to block when the
 362  * bus transaction is happening, and be freed up by an interrupt
 363  * (The MPC85xx has this ability, though it is not currently
 364  * supported in the driver).
 365  */
 366 struct phy_driver {
 367         u32 phy_id;
 368         char *name;
 369         unsigned int phy_id_mask;
 370         u32 features;
 371         u32 flags;
 372
 373         /*
 374          * Called to initialize the PHY,
 375          * including after a reset
 376          */
 377         int (*config_init)(struct phy_device *phydev);
 378
 379         /*
 380          * Called during discovery.  Used to set
 381          * up device-specific structures, if any
 382          */
 383         int (*probe)(struct phy_device *phydev);
 384
 385         /* PHY Power Management */
 386         int (*suspend)(struct phy_device *phydev);
 387         int (*resume)(struct phy_device *phydev);
 388
 389         /*
 390          * Configures the advertisement and resets
 391          * autonegotiation if phydev->autoneg is on,
 392          * forces the speed to the current settings in phydev
 393          * if phydev->autoneg is off
 394          */
 395         int (*config_aneg)(struct phy_device *phydev);
 396
 397         /* Determines the negotiated speed and duplex */
 398         int (*read_status)(struct phy_device *phydev);
 399
 400         /* Clears any pending interrupts */
 401         int (*ack_interrupt)(struct phy_device *phydev);
 402
 403         /* Enables or disables interrupts */
 404         int (*config_intr)(struct phy_device *phydev);
 405
 406         /*
 407          * Checks if the PHY generated an interrupt.
 408          * For multi-PHY devices with shared PHY interrupt pin
 409          */
 410         int (*did_interrupt)(struct phy_device *phydev);
 411
 412         /* Clears up any memory if needed */
 413         void (*remove)(struct phy_device *phydev);
 414
 415         /* Handles SIOCSHWTSTAMP ioctl for hardware time stamping. */
 416         int  (*hwtstamp)(struct phy_device *phydev, struct ifreq *ifr);
 417
 418         /*
 419          * Requests a Rx timestamp for 'skb'. If the skb is accepted,
 420          * the phy driver promises to deliver it using netif_rx() as
 421          * soon as a timestamp becomes available. One of the
 422          * PTP_CLASS_ values is passed in 'type'. The function must
 423          * return true if the skb is accepted for delivery.
 424          */
 425         bool (*rxtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
 426
 427         /*
 428          * Requests a Tx timestamp for 'skb'. The phy driver promises
 429          * to deliver it using skb_complete_tx_timestamp() as soon as a
 430          * timestamp becomes available. One of the PTP_CLASS_ values
 431          * is passed in 'type'.
 432          */
 433         void (*txtstamp)(struct phy_device *dev, struct sk_buff *skb, int type);
 434
 435         struct device_driver driver;
 436 };
 437 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
 438
 439 #define PHY_ANY_ID "MATCH ANY PHY"
 440 #define PHY_ANY_UID 0xffffffff
 441
 442 /* A Structure for boards to register fixups with the PHY Lib */
 443 struct phy_fixup {
 444         struct list_head list;
 445         char bus_id[20];
 446         u32 phy_uid;
 447         u32 phy_uid_mask;
 448         int (*run)(struct phy_device *phydev);
 449 };
 450
 451 /**
 452  * phy_read - Convenience function for reading a given PHY register
 453  * @phydev: the phy_device struct
 454  * @regnum: register number to read
 455  *
 456  * NOTE: MUST NOT be called from interrupt context,
 457  * because the bus read/write functions may wait for an interrupt
 458  * to conclude the operation.
 459  */
 460 static inline int phy_read(struct phy_device *phydev, u32 regnum)
 461 {
 462         return mdiobus_read(phydev->bus, phydev->addr, regnum);
 463 }
 464
 465 /**
 466  * phy_write - Convenience function for writing a given PHY register
 467  * @phydev: the phy_device struct
 468  * @regnum: register number to write
 469  * @val: value to write to @regnum
 470  *
 471  * NOTE: MUST NOT be called from interrupt context,
 472  * because the bus read/write functions may wait for an interrupt
 473  * to conclude the operation.
 474  */
 475 static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)
 476 {
 477         return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
 478 }
 479
 480 int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
 481 struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
 482 int phy_device_register(struct phy_device *phy);
 483 int phy_init_hw(struct phy_device *phydev);
 484 struct phy_device * phy_attach(struct net_device *dev,
 485                 const char *bus_id, u32 flags, phy_interface_t interface);
 486 struct phy_device *phy_find_first(struct mii_bus *bus);
 487 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 488                 void (*handler)(struct net_device *), u32 flags,
 489                 phy_interface_t interface);
 490 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 491                 void (*handler)(struct net_device *), u32 flags,
 492                 phy_interface_t interface);
 493 void phy_disconnect(struct phy_device *phydev);
 494 void phy_detach(struct phy_device *phydev);
 495 void phy_start(struct phy_device *phydev);
 496 void phy_stop(struct phy_device *phydev);
 497 int phy_start_aneg(struct phy_device *phydev);
 498
 499 int phy_stop_interrupts(struct phy_device *phydev);
 500
 501 static inline int phy_read_status(struct phy_device *phydev) {
 502         return phydev->drv->read_status(phydev);
 503 }
 504
 505 int genphy_restart_aneg(struct phy_device *phydev);
 506 int genphy_config_aneg(struct phy_device *phydev);
 507 int genphy_update_link(struct phy_device *phydev);
 508 int genphy_read_status(struct phy_device *phydev);
 509 int genphy_suspend(struct phy_device *phydev);
 510 int genphy_resume(struct phy_device *phydev);
 511 void phy_driver_unregister(struct phy_driver *drv);
 512 int phy_driver_register(struct phy_driver *new_driver);
 513 void phy_state_machine(struct work_struct *work);
 514 void phy_start_machine(struct phy_device *phydev,
 515                 void (*handler)(struct net_device *));
 516 void phy_stop_machine(struct phy_device *phydev);
 517 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 518 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 519 int phy_mii_ioctl(struct phy_device *phydev,
 520                 struct ifreq *ifr, int cmd);
 521 int phy_start_interrupts(struct phy_device *phydev);
 522 void phy_print_status(struct phy_device *phydev);
 523 void phy_device_free(struct phy_device *phydev);
 524
 525 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
 526                 int (*run)(struct phy_device *));
 527 int phy_register_fixup_for_id(const char *bus_id,
 528                 int (*run)(struct phy_device *));
 529 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
 530                 int (*run)(struct phy_device *));
 531 int phy_scan_fixups(struct phy_device *phydev);
 532
 533 int __init mdio_bus_init(void);
 534 void mdio_bus_exit(void);
 535
 536 extern struct bus_type mdio_bus_type;
 537 #endif /* __PHY_H */