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 #define PHY_BASIC_FEATURES      (SUPPORTED_10baseT_Half | \
  29                                  SUPPORTED_10baseT_Full | \
  30                                  SUPPORTED_100baseT_Half | \
  31                                  SUPPORTED_100baseT_Full | \
  32                                  SUPPORTED_Autoneg | \
  33                                  SUPPORTED_TP | \
  34                                  SUPPORTED_MII)
  35
  36 #define PHY_GBIT_FEATURES       (PHY_BASIC_FEATURES | \
  37                                  SUPPORTED_1000baseT_Half | \
  38                                  SUPPORTED_1000baseT_Full)
  39
  40 /* Set phydev->irq to PHY_POLL if interrupts are not supported,
  41  * or not desired for this PHY.  Set to PHY_IGNORE_INTERRUPT if
  42  * the attached driver handles the interrupt
  43  */
  44 #define PHY_POLL                -1
  45 #define PHY_IGNORE_INTERRUPT    -2
  46
  47 #define PHY_HAS_INTERRUPT       0x00000001
  48 #define PHY_HAS_MAGICANEG       0x00000002
  49
  50 /* Interface Mode definitions */
  51 typedef enum {
  52         PHY_INTERFACE_MODE_MII,
  53         PHY_INTERFACE_MODE_GMII,
  54         PHY_INTERFACE_MODE_SGMII,
  55         PHY_INTERFACE_MODE_TBI,
  56         PHY_INTERFACE_MODE_RMII,
  57         PHY_INTERFACE_MODE_RGMII,
  58         PHY_INTERFACE_MODE_RGMII_ID,
  59         PHY_INTERFACE_MODE_RTBI
  60 } phy_interface_t;
  61
  62 #define MII_BUS_MAX 4
  63
  64
  65 #define PHY_INIT_TIMEOUT        100000
  66 #define PHY_STATE_TIME          1
  67 #define PHY_FORCE_TIMEOUT       10
  68 #define PHY_AN_TIMEOUT          10
  69
  70 #define PHY_MAX_ADDR    32
  71
  72 /* Used when trying to connect to a specific phy (mii bus id:phy device id) */
  73 #define PHY_ID_FMT "%x:%02x"
  74
  75 /* The Bus class for PHYs.  Devices which provide access to
  76  * PHYs should register using this structure */
  77 struct mii_bus {
  78         const char *name;
  79         int id;
  80         void *priv;
  81         int (*read)(struct mii_bus *bus, int phy_id, int regnum);
  82         int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
  83         int (*reset)(struct mii_bus *bus);
  84
  85         /* A lock to ensure that only one thing can read/write
  86          * the MDIO bus at a time */
  87         spinlock_t mdio_lock;
  88
  89         struct device *dev;
  90
  91         /* list of all PHYs on bus */
  92         struct phy_device *phy_map[PHY_MAX_ADDR];
  93
  94         /* Phy addresses to be ignored when probing */
  95         u32 phy_mask;
  96
  97         /* Pointer to an array of interrupts, each PHY's
  98          * interrupt at the index matching its address */
  99         int *irq;
 100 };
 101
 102 #define PHY_INTERRUPT_DISABLED  0x0
 103 #define PHY_INTERRUPT_ENABLED   0x80000000
 104
 105 /* PHY state machine states:
 106  *
 107  * DOWN: PHY device and driver are not ready for anything.  probe
 108  * should be called if and only if the PHY is in this state,
 109  * given that the PHY device exists.
 110  * - PHY driver probe function will, depending on the PHY, set
 111  * the state to STARTING or READY
 112  *
 113  * STARTING:  PHY device is coming up, and the ethernet driver is
 114  * not ready.  PHY drivers may set this in the probe function.
 115  * If they do, they are responsible for making sure the state is
 116  * eventually set to indicate whether the PHY is UP or READY,
 117  * depending on the state when the PHY is done starting up.
 118  * - PHY driver will set the state to READY
 119  * - start will set the state to PENDING
 120  *
 121  * READY: PHY is ready to send and receive packets, but the
 122  * controller is not.  By default, PHYs which do not implement
 123  * probe will be set to this state by phy_probe().  If the PHY
 124  * driver knows the PHY is ready, and the PHY state is STARTING,
 125  * then it sets this STATE.
 126  * - start will set the state to UP
 127  *
 128  * PENDING: PHY device is coming up, but the ethernet driver is
 129  * ready.  phy_start will set this state if the PHY state is
 130  * STARTING.
 131  * - PHY driver will set the state to UP when the PHY is ready
 132  *
 133  * UP: The PHY and attached device are ready to do work.
 134  * Interrupts should be started here.
 135  * - timer moves to AN
 136  *
 137  * AN: The PHY is currently negotiating the link state.  Link is
 138  * therefore down for now.  phy_timer will set this state when it
 139  * detects the state is UP.  config_aneg will set this state
 140  * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
 141  * - If autonegotiation finishes, but there's no link, it sets
 142  *   the state to NOLINK.
 143  * - If aneg finishes with link, it sets the state to RUNNING,
 144  *   and calls adjust_link
 145  * - If autonegotiation did not finish after an arbitrary amount
 146  *   of time, autonegotiation should be tried again if the PHY
 147  *   supports "magic" autonegotiation (back to AN)
 148  * - If it didn't finish, and no magic_aneg, move to FORCING.
 149  *
 150  * NOLINK: PHY is up, but not currently plugged in.
 151  * - If the timer notes that the link comes back, we move to RUNNING
 152  * - config_aneg moves to AN
 153  * - phy_stop moves to HALTED
 154  *
 155  * FORCING: PHY is being configured with forced settings
 156  * - if link is up, move to RUNNING
 157  * - If link is down, we drop to the next highest setting, and
 158  *   retry (FORCING) after a timeout
 159  * - phy_stop moves to HALTED
 160  *
 161  * RUNNING: PHY is currently up, running, and possibly sending
 162  * and/or receiving packets
 163  * - timer will set CHANGELINK if we're polling (this ensures the
 164  *   link state is polled every other cycle of this state machine,
 165  *   which makes it every other second)
 166  * - irq will set CHANGELINK
 167  * - config_aneg will set AN
 168  * - phy_stop moves to HALTED
 169  *
 170  * CHANGELINK: PHY experienced a change in link state
 171  * - timer moves to RUNNING if link
 172  * - timer moves to NOLINK if the link is down
 173  * - phy_stop moves to HALTED
 174  *
 175  * HALTED: PHY is up, but no polling or interrupts are done. Or
 176  * PHY is in an error state.
 177  *
 178  * - phy_start moves to RESUMING
 179  *
 180  * RESUMING: PHY was halted, but now wants to run again.
 181  * - If we are forcing, or aneg is done, timer moves to RUNNING
 182  * - If aneg is not done, timer moves to AN
 183  * - phy_stop moves to HALTED
 184  */
 185 enum phy_state {
 186         PHY_DOWN=0,
 187         PHY_STARTING,
 188         PHY_READY,
 189         PHY_PENDING,
 190         PHY_UP,
 191         PHY_AN,
 192         PHY_RUNNING,
 193         PHY_NOLINK,
 194         PHY_FORCING,
 195         PHY_CHANGELINK,
 196         PHY_HALTED,
 197         PHY_RESUMING
 198 };
 199
 200 /* phy_device: An instance of a PHY
 201  *
 202  * drv: Pointer to the driver for this PHY instance
 203  * bus: Pointer to the bus this PHY is on
 204  * dev: driver model device structure for this PHY
 205  * phy_id: UID for this device found during discovery
 206  * state: state of the PHY for management purposes
 207  * dev_flags: Device-specific flags used by the PHY driver.
 208  * addr: Bus address of PHY
 209  * link_timeout: The number of timer firings to wait before the
 210  * giving up on the current attempt at acquiring a link
 211  * irq: IRQ number of the PHY's interrupt (-1 if none)
 212  * phy_timer: The timer for handling the state machine
 213  * phy_queue: A work_queue for the interrupt
 214  * attached_dev: The attached enet driver's device instance ptr
 215  * adjust_link: Callback for the enet controller to respond to
 216  * changes in the link state.
 217  * adjust_state: Callback for the enet driver to respond to
 218  * changes in the state machine.
 219  *
 220  * speed, duplex, pause, supported, advertising, and
 221  * autoneg are used like in mii_if_info
 222  *
 223  * interrupts currently only supports enabled or disabled,
 224  * but could be changed in the future to support enabling
 225  * and disabling specific interrupts
 226  *
 227  * Contains some infrastructure for polling and interrupt
 228  * handling, as well as handling shifts in PHY hardware state
 229  */
 230 struct phy_device {
 231         /* Information about the PHY type */
 232         /* And management functions */
 233         struct phy_driver *drv;
 234
 235         struct mii_bus *bus;
 236
 237         struct device dev;
 238
 239         u32 phy_id;
 240
 241         enum phy_state state;
 242
 243         u32 dev_flags;
 244
 245         phy_interface_t interface;
 246
 247         /* Bus address of the PHY (0-32) */
 248         int addr;
 249
 250         /* forced speed & duplex (no autoneg)
 251          * partner speed & duplex & pause (autoneg)
 252          */
 253         int speed;
 254         int duplex;
 255         int pause;
 256         int asym_pause;
 257
 258         /* The most recently read link state */
 259         int link;
 260
 261         /* Enabled Interrupts */
 262         u32 interrupts;
 263
 264         /* Union of PHY and Attached devices' supported modes */
 265         /* See mii.h for more info */
 266         u32 supported;
 267         u32 advertising;
 268
 269         int autoneg;
 270
 271         int link_timeout;
 272
 273         /* Interrupt number for this PHY
 274          * -1 means no interrupt */
 275         int irq;
 276
 277         /* private data pointer */
 278         /* For use by PHYs to maintain extra state */
 279         void *priv;
 280
 281         /* Interrupt and Polling infrastructure */
 282         struct work_struct phy_queue;
 283         struct timer_list phy_timer;
 284
 285         spinlock_t lock;
 286
 287         struct net_device *attached_dev;
 288
 289         void (*adjust_link)(struct net_device *dev);
 290
 291         void (*adjust_state)(struct net_device *dev);
 292 };
 293 #define to_phy_device(d) container_of(d, struct phy_device, dev)
 294
 295 /* struct phy_driver: Driver structure for a particular PHY type
 296  *
 297  * phy_id: The result of reading the UID registers of this PHY
 298  *   type, and ANDing them with the phy_id_mask.  This driver
 299  *   only works for PHYs with IDs which match this field
 300  * name: The friendly name of this PHY type
 301  * phy_id_mask: Defines the important bits of the phy_id
 302  * features: A list of features (speed, duplex, etc) supported
 303  *   by this PHY
 304  * flags: A bitfield defining certain other features this PHY
 305  *   supports (like interrupts)
 306  *
 307  * The drivers must implement config_aneg and read_status.  All
 308  * other functions are optional. Note that none of these
 309  * functions should be called from interrupt time.  The goal is
 310  * for the bus read/write functions to be able to block when the
 311  * bus transaction is happening, and be freed up by an interrupt
 312  * (The MPC85xx has this ability, though it is not currently
 313  * supported in the driver).
 314  */
 315 struct phy_driver {
 316         u32 phy_id;
 317         char *name;
 318         unsigned int phy_id_mask;
 319         u32 features;
 320         u32 flags;
 321
 322         /* Called to initialize the PHY,
 323          * including after a reset */
 324         int (*config_init)(struct phy_device *phydev);
 325
 326         /* Called during discovery.  Used to set
 327          * up device-specific structures, if any */
 328         int (*probe)(struct phy_device *phydev);
 329
 330         /* PHY Power Management */
 331         int (*suspend)(struct phy_device *phydev);
 332         int (*resume)(struct phy_device *phydev);
 333
 334         /* Configures the advertisement and resets
 335          * autonegotiation if phydev->autoneg is on,
 336          * forces the speed to the current settings in phydev
 337          * if phydev->autoneg is off */
 338         int (*config_aneg)(struct phy_device *phydev);
 339
 340         /* Determines the negotiated speed and duplex */
 341         int (*read_status)(struct phy_device *phydev);
 342
 343         /* Clears any pending interrupts */
 344         int (*ack_interrupt)(struct phy_device *phydev);
 345
 346         /* Enables or disables interrupts */
 347         int (*config_intr)(struct phy_device *phydev);
 348
 349         /* Clears up any memory if needed */
 350         void (*remove)(struct phy_device *phydev);
 351
 352         struct device_driver driver;
 353 };
 354 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
 355
 356 int phy_read(struct phy_device *phydev, u16 regnum);
 357 int phy_write(struct phy_device *phydev, u16 regnum, u16 val);
 358 struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
 359 int phy_clear_interrupt(struct phy_device *phydev);
 360 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
 361 struct phy_device * phy_attach(struct net_device *dev,
 362                 const char *phy_id, u32 flags, phy_interface_t interface);
 363 struct phy_device * phy_connect(struct net_device *dev, const char *phy_id,
 364                 void (*handler)(struct net_device *), u32 flags,
 365                 phy_interface_t interface);
 366 void phy_disconnect(struct phy_device *phydev);
 367 void phy_detach(struct phy_device *phydev);
 368 void phy_start(struct phy_device *phydev);
 369 void phy_stop(struct phy_device *phydev);
 370 int phy_start_aneg(struct phy_device *phydev);
 371
 372 int mdiobus_register(struct mii_bus *bus);
 373 void mdiobus_unregister(struct mii_bus *bus);
 374 void phy_sanitize_settings(struct phy_device *phydev);
 375 int phy_stop_interrupts(struct phy_device *phydev);
 376
 377 static inline int phy_read_status(struct phy_device *phydev) {
 378         return phydev->drv->read_status(phydev);
 379 }
 380
 381 int genphy_config_advert(struct phy_device *phydev);
 382 int genphy_setup_forced(struct phy_device *phydev);
 383 int genphy_restart_aneg(struct phy_device *phydev);
 384 int genphy_config_aneg(struct phy_device *phydev);
 385 int genphy_update_link(struct phy_device *phydev);
 386 int genphy_read_status(struct phy_device *phydev);
 387 void phy_driver_unregister(struct phy_driver *drv);
 388 int phy_driver_register(struct phy_driver *new_driver);
 389 void phy_prepare_link(struct phy_device *phydev,
 390                 void (*adjust_link)(struct net_device *));
 391 void phy_start_machine(struct phy_device *phydev,
 392                 void (*handler)(struct net_device *));
 393 void phy_stop_machine(struct phy_device *phydev);
 394 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 395 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 396 int phy_mii_ioctl(struct phy_device *phydev,
 397                 struct mii_ioctl_data *mii_data, int cmd);
 398 int phy_start_interrupts(struct phy_device *phydev);
 399 void phy_print_status(struct phy_device *phydev);
 400 struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id);
 401
 402 extern struct bus_type mdio_bus_type;
 403 #endif /* __PHY_H */