phy.h 15.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*
 * include/linux/phy.h
 *
 * Framework and drivers for configuring and reading different PHYs
 * Based on code in sungem_phy.c and gianfar_phy.c
 *
 * Author: Andy Fleming
 *
 * Copyright (c) 2004 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#ifndef __PHY_H
#define __PHY_H

#include <linux/spinlock.h>
#include <linux/device.h>
23 24 25 26
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
27

28 29
#include <asm/atomic.h>

30 31 32 33 34 35 36 37 38 39 40 41
#define PHY_BASIC_FEATURES	(SUPPORTED_10baseT_Half | \
				 SUPPORTED_10baseT_Full | \
				 SUPPORTED_100baseT_Half | \
				 SUPPORTED_100baseT_Full | \
				 SUPPORTED_Autoneg | \
				 SUPPORTED_TP | \
				 SUPPORTED_MII)

#define PHY_GBIT_FEATURES	(PHY_BASIC_FEATURES | \
				 SUPPORTED_1000baseT_Half | \
				 SUPPORTED_1000baseT_Full)

A
Andy Fleming 已提交
42 43
/*
 * Set phydev->irq to PHY_POLL if interrupts are not supported,
44 45 46 47 48 49 50 51 52
 * or not desired for this PHY.  Set to PHY_IGNORE_INTERRUPT if
 * the attached driver handles the interrupt
 */
#define PHY_POLL		-1
#define PHY_IGNORE_INTERRUPT	-2

#define PHY_HAS_INTERRUPT	0x00000001
#define PHY_HAS_MAGICANEG	0x00000002

53 54 55 56 57 58 59 60
/* Interface Mode definitions */
typedef enum {
	PHY_INTERFACE_MODE_MII,
	PHY_INTERFACE_MODE_GMII,
	PHY_INTERFACE_MODE_SGMII,
	PHY_INTERFACE_MODE_TBI,
	PHY_INTERFACE_MODE_RMII,
	PHY_INTERFACE_MODE_RGMII,
61
	PHY_INTERFACE_MODE_RGMII_ID,
62 63
	PHY_INTERFACE_MODE_RGMII_RXID,
	PHY_INTERFACE_MODE_RGMII_TXID,
64 65 66
	PHY_INTERFACE_MODE_RTBI
} phy_interface_t;

67

68
#define PHY_INIT_TIMEOUT	100000
69 70 71 72
#define PHY_STATE_TIME		1
#define PHY_FORCE_TIMEOUT	10
#define PHY_AN_TIMEOUT		10

73
#define PHY_MAX_ADDR	32
74

75
/* Used when trying to connect to a specific phy (mii bus id:phy device id) */
76 77 78 79 80 81 82
#define PHY_ID_FMT "%s:%02x"

/*
 * Need to be a little smaller than phydev->dev.bus_id to leave room
 * for the ":%02x"
 */
#define MII_BUS_ID_SIZE	(BUS_ID_SIZE - 3)
83

A
Andy Fleming 已提交
84 85 86 87
/*
 * The Bus class for PHYs.  Devices which provide access to
 * PHYs should register using this structure
 */
88 89
struct mii_bus {
	const char *name;
90
	char id[MII_BUS_ID_SIZE];
91 92 93 94 95
	void *priv;
	int (*read)(struct mii_bus *bus, int phy_id, int regnum);
	int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
	int (*reset)(struct mii_bus *bus);

A
Andy Fleming 已提交
96 97 98 99
	/*
	 * A lock to ensure that only one thing can read/write
	 * the MDIO bus at a time
	 */
100
	struct mutex mdio_lock;
101

102
	struct device *parent;
103 104 105 106 107 108 109
	enum {
		MDIOBUS_ALLOCATED = 1,
		MDIOBUS_REGISTERED,
		MDIOBUS_UNREGISTERED,
		MDIOBUS_RELEASED,
	} state;
	struct device dev;
110 111 112 113

	/* list of all PHYs on bus */
	struct phy_device *phy_map[PHY_MAX_ADDR];

114 115 116
	/* Phy addresses to be ignored when probing */
	u32 phy_mask;

A
Andy Fleming 已提交
117 118 119 120
	/*
	 * Pointer to an array of interrupts, each PHY's
	 * interrupt at the index matching its address
	 */
121 122
	int *irq;
};
123
#define to_mii_bus(d) container_of(d, struct mii_bus, dev)
124

125 126 127 128 129 130 131 132 133
struct mii_bus *mdiobus_alloc(void);
int mdiobus_register(struct mii_bus *bus);
void mdiobus_unregister(struct mii_bus *bus);
void mdiobus_free(struct mii_bus *bus);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum);
int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val);


134 135
#define PHY_INTERRUPT_DISABLED	0x0
#define PHY_INTERRUPT_ENABLED	0x80000000
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276

/* PHY state machine states:
 *
 * DOWN: PHY device and driver are not ready for anything.  probe
 * should be called if and only if the PHY is in this state,
 * given that the PHY device exists.
 * - PHY driver probe function will, depending on the PHY, set
 * the state to STARTING or READY
 *
 * STARTING:  PHY device is coming up, and the ethernet driver is
 * not ready.  PHY drivers may set this in the probe function.
 * If they do, they are responsible for making sure the state is
 * eventually set to indicate whether the PHY is UP or READY,
 * depending on the state when the PHY is done starting up.
 * - PHY driver will set the state to READY
 * - start will set the state to PENDING
 *
 * READY: PHY is ready to send and receive packets, but the
 * controller is not.  By default, PHYs which do not implement
 * probe will be set to this state by phy_probe().  If the PHY
 * driver knows the PHY is ready, and the PHY state is STARTING,
 * then it sets this STATE.
 * - start will set the state to UP
 *
 * PENDING: PHY device is coming up, but the ethernet driver is
 * ready.  phy_start will set this state if the PHY state is
 * STARTING.
 * - PHY driver will set the state to UP when the PHY is ready
 *
 * UP: The PHY and attached device are ready to do work.
 * Interrupts should be started here.
 * - timer moves to AN
 *
 * AN: The PHY is currently negotiating the link state.  Link is
 * therefore down for now.  phy_timer will set this state when it
 * detects the state is UP.  config_aneg will set this state
 * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
 * - If autonegotiation finishes, but there's no link, it sets
 *   the state to NOLINK.
 * - If aneg finishes with link, it sets the state to RUNNING,
 *   and calls adjust_link
 * - If autonegotiation did not finish after an arbitrary amount
 *   of time, autonegotiation should be tried again if the PHY
 *   supports "magic" autonegotiation (back to AN)
 * - If it didn't finish, and no magic_aneg, move to FORCING.
 *
 * NOLINK: PHY is up, but not currently plugged in.
 * - If the timer notes that the link comes back, we move to RUNNING
 * - config_aneg moves to AN
 * - phy_stop moves to HALTED
 *
 * FORCING: PHY is being configured with forced settings
 * - if link is up, move to RUNNING
 * - If link is down, we drop to the next highest setting, and
 *   retry (FORCING) after a timeout
 * - phy_stop moves to HALTED
 *
 * RUNNING: PHY is currently up, running, and possibly sending
 * and/or receiving packets
 * - timer will set CHANGELINK if we're polling (this ensures the
 *   link state is polled every other cycle of this state machine,
 *   which makes it every other second)
 * - irq will set CHANGELINK
 * - config_aneg will set AN
 * - phy_stop moves to HALTED
 *
 * CHANGELINK: PHY experienced a change in link state
 * - timer moves to RUNNING if link
 * - timer moves to NOLINK if the link is down
 * - phy_stop moves to HALTED
 *
 * HALTED: PHY is up, but no polling or interrupts are done. Or
 * PHY is in an error state.
 *
 * - phy_start moves to RESUMING
 *
 * RESUMING: PHY was halted, but now wants to run again.
 * - If we are forcing, or aneg is done, timer moves to RUNNING
 * - If aneg is not done, timer moves to AN
 * - phy_stop moves to HALTED
 */
enum phy_state {
	PHY_DOWN=0,
	PHY_STARTING,
	PHY_READY,
	PHY_PENDING,
	PHY_UP,
	PHY_AN,
	PHY_RUNNING,
	PHY_NOLINK,
	PHY_FORCING,
	PHY_CHANGELINK,
	PHY_HALTED,
	PHY_RESUMING
};

/* phy_device: An instance of a PHY
 *
 * drv: Pointer to the driver for this PHY instance
 * bus: Pointer to the bus this PHY is on
 * dev: driver model device structure for this PHY
 * phy_id: UID for this device found during discovery
 * state: state of the PHY for management purposes
 * dev_flags: Device-specific flags used by the PHY driver.
 * addr: Bus address of PHY
 * link_timeout: The number of timer firings to wait before the
 * giving up on the current attempt at acquiring a link
 * irq: IRQ number of the PHY's interrupt (-1 if none)
 * phy_timer: The timer for handling the state machine
 * phy_queue: A work_queue for the interrupt
 * attached_dev: The attached enet driver's device instance ptr
 * adjust_link: Callback for the enet controller to respond to
 * changes in the link state.
 * adjust_state: Callback for the enet driver to respond to
 * changes in the state machine.
 *
 * speed, duplex, pause, supported, advertising, and
 * autoneg are used like in mii_if_info
 *
 * interrupts currently only supports enabled or disabled,
 * but could be changed in the future to support enabling
 * and disabling specific interrupts
 *
 * Contains some infrastructure for polling and interrupt
 * handling, as well as handling shifts in PHY hardware state
 */
struct phy_device {
	/* Information about the PHY type */
	/* And management functions */
	struct phy_driver *drv;

	struct mii_bus *bus;

	struct device dev;

	u32 phy_id;

	enum phy_state state;

	u32 dev_flags;

277 278
	phy_interface_t interface;

279 280 281
	/* Bus address of the PHY (0-32) */
	int addr;

A
Andy Fleming 已提交
282 283
	/*
	 * forced speed & duplex (no autoneg)
284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305
	 * partner speed & duplex & pause (autoneg)
	 */
	int speed;
	int duplex;
	int pause;
	int asym_pause;

	/* The most recently read link state */
	int link;

	/* Enabled Interrupts */
	u32 interrupts;

	/* Union of PHY and Attached devices' supported modes */
	/* See mii.h for more info */
	u32 supported;
	u32 advertising;

	int autoneg;

	int link_timeout;

A
Andy Fleming 已提交
306 307 308 309
	/*
	 * Interrupt number for this PHY
	 * -1 means no interrupt
	 */
310 311 312 313 314 315 316 317
	int irq;

	/* private data pointer */
	/* For use by PHYs to maintain extra state */
	void *priv;

	/* Interrupt and Polling infrastructure */
	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;
323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358

	struct net_device *attached_dev;

	void (*adjust_link)(struct net_device *dev);

	void (*adjust_state)(struct net_device *dev);
};
#define to_phy_device(d) container_of(d, struct phy_device, dev)

/* struct phy_driver: Driver structure for a particular PHY type
 *
 * phy_id: The result of reading the UID registers of this PHY
 *   type, and ANDing them with the phy_id_mask.  This driver
 *   only works for PHYs with IDs which match this field
 * name: The friendly name of this PHY type
 * phy_id_mask: Defines the important bits of the phy_id
 * features: A list of features (speed, duplex, etc) supported
 *   by this PHY
 * flags: A bitfield defining certain other features this PHY
 *   supports (like interrupts)
 *
 * The drivers must implement config_aneg and read_status.  All
 * other functions are optional. Note that none of these
 * functions should be called from interrupt time.  The goal is
 * for the bus read/write functions to be able to block when the
 * bus transaction is happening, and be freed up by an interrupt
 * (The MPC85xx has this ability, though it is not currently
 * supported in the driver).
 */
struct phy_driver {
	u32 phy_id;
	char *name;
	unsigned int phy_id_mask;
	u32 features;
	u32 flags;

A
Andy Fleming 已提交
359 360 361 362
	/*
	 * Called to initialize the PHY,
	 * including after a reset
	 */
363 364
	int (*config_init)(struct phy_device *phydev);

A
Andy Fleming 已提交
365 366 367 368
	/*
	 * Called during discovery.  Used to set
	 * up device-specific structures, if any
	 */
369 370 371 372 373 374
	int (*probe)(struct phy_device *phydev);

	/* PHY Power Management */
	int (*suspend)(struct phy_device *phydev);
	int (*resume)(struct phy_device *phydev);

A
Andy Fleming 已提交
375 376
	/*
	 * Configures the advertisement and resets
377 378
	 * autonegotiation if phydev->autoneg is on,
	 * forces the speed to the current settings in phydev
A
Andy Fleming 已提交
379 380
	 * if phydev->autoneg is off
	 */
381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398
	int (*config_aneg)(struct phy_device *phydev);

	/* Determines the negotiated speed and duplex */
	int (*read_status)(struct phy_device *phydev);

	/* Clears any pending interrupts */
	int (*ack_interrupt)(struct phy_device *phydev);

	/* Enables or disables interrupts */
	int (*config_intr)(struct phy_device *phydev);

	/* Clears up any memory if needed */
	void (*remove)(struct phy_device *phydev);

	struct device_driver driver;
};
#define to_phy_driver(d) container_of(d, struct phy_driver, driver)

399 400 401 402 403 404 405 406 407 408 409 410
#define PHY_ANY_ID "MATCH ANY PHY"
#define PHY_ANY_UID 0xffffffff

/* A Structure for boards to register fixups with the PHY Lib */
struct phy_fixup {
	struct list_head list;
	char bus_id[BUS_ID_SIZE];
	u32 phy_uid;
	u32 phy_uid_mask;
	int (*run)(struct phy_device *phydev);
};

411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
/**
 * phy_read - Convenience function for reading a given PHY register
 * @phydev: the phy_device struct
 * @regnum: register number to read
 *
 * NOTE: MUST NOT be called from interrupt context,
 * because the bus read/write functions may wait for an interrupt
 * to conclude the operation.
 */
static inline int phy_read(struct phy_device *phydev, u16 regnum)
{
	return mdiobus_read(phydev->bus, phydev->addr, regnum);
}

/**
 * phy_write - Convenience function for writing a given PHY register
 * @phydev: the phy_device struct
 * @regnum: register number to write
 * @val: value to write to @regnum
 *
 * NOTE: MUST NOT be called from interrupt context,
 * because the bus read/write functions may wait for an interrupt
 * to conclude the operation.
 */
static inline int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
{
	return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
}

440
int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
441 442 443
struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
int phy_clear_interrupt(struct phy_device *phydev);
int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
A
Andy Fleming 已提交
444
struct phy_device * phy_attach(struct net_device *dev,
445 446
		const char *bus_id, u32 flags, phy_interface_t interface);
struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
447 448
		void (*handler)(struct net_device *), u32 flags,
		phy_interface_t interface);
A
Andy Fleming 已提交
449 450 451 452 453 454 455 456
void phy_disconnect(struct phy_device *phydev);
void phy_detach(struct phy_device *phydev);
void phy_start(struct phy_device *phydev);
void phy_stop(struct phy_device *phydev);
int phy_start_aneg(struct phy_device *phydev);

void phy_sanitize_settings(struct phy_device *phydev);
int phy_stop_interrupts(struct phy_device *phydev);
A
Andy Fleming 已提交
457 458
int phy_enable_interrupts(struct phy_device *phydev);
int phy_disable_interrupts(struct phy_device *phydev);
459 460 461 462 463

static inline int phy_read_status(struct phy_device *phydev) {
	return phydev->drv->read_status(phydev);
}

A
Andy Fleming 已提交
464
int genphy_config_advert(struct phy_device *phydev);
465 466 467 468 469
int genphy_setup_forced(struct phy_device *phydev);
int genphy_restart_aneg(struct phy_device *phydev);
int genphy_config_aneg(struct phy_device *phydev);
int genphy_update_link(struct phy_device *phydev);
int genphy_read_status(struct phy_device *phydev);
G
Giuseppe Cavallaro 已提交
470 471
int genphy_suspend(struct phy_device *phydev);
int genphy_resume(struct phy_device *phydev);
472 473 474 475 476 477 478 479 480 481 482
void phy_driver_unregister(struct phy_driver *drv);
int phy_driver_register(struct phy_driver *new_driver);
void phy_prepare_link(struct phy_device *phydev,
		void (*adjust_link)(struct net_device *));
void phy_start_machine(struct phy_device *phydev,
		void (*handler)(struct net_device *));
void phy_stop_machine(struct phy_device *phydev);
int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
int phy_mii_ioctl(struct phy_device *phydev,
		struct mii_ioctl_data *mii_data, int cmd);
A
Andy Fleming 已提交
483 484
int phy_start_interrupts(struct phy_device *phydev);
void phy_print_status(struct phy_device *phydev);
485
struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id);
486
void phy_device_free(struct phy_device *phydev);
487

488 489 490 491 492 493 494 495
int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
		int (*run)(struct phy_device *));
int phy_register_fixup_for_id(const char *bus_id,
		int (*run)(struct phy_device *));
int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
		int (*run)(struct phy_device *));
int phy_scan_fixups(struct phy_device *phydev);

A
Andy Fleming 已提交
496 497 498
int __init mdio_bus_init(void);
void mdio_bus_exit(void);

499 500
extern struct bus_type mdio_bus_type;
#endif /* __PHY_H */